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>
69 #include "md-cluster.h"
72 static void autostart_arrays(int part);
75 /* pers_list is a list of registered personalities protected
77 * pers_lock does extra service to protect accesses to
78 * mddev->thread when the mutex cannot be held.
80 static LIST_HEAD(pers_list);
81 static DEFINE_SPINLOCK(pers_lock);
83 struct md_cluster_operations *md_cluster_ops;
84 EXPORT_SYMBOL(md_cluster_ops);
85 struct module *md_cluster_mod;
86 EXPORT_SYMBOL(md_cluster_mod);
88 static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
89 static struct workqueue_struct *md_wq;
90 static struct workqueue_struct *md_misc_wq;
92 static int remove_and_add_spares(struct mddev *mddev,
93 struct md_rdev *this);
94 static void mddev_detach(struct mddev *mddev);
97 * Default number of read corrections we'll attempt on an rdev
98 * before ejecting it from the array. We divide the read error
99 * count by 2 for every hour elapsed between read errors.
101 #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
103 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
104 * is 1000 KB/sec, so the extra system load does not show up that much.
105 * Increase it if you want to have more _guaranteed_ speed. Note that
106 * the RAID driver will use the maximum available bandwidth if the IO
107 * subsystem is idle. There is also an 'absolute maximum' reconstruction
108 * speed limit - in case reconstruction slows down your system despite
111 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
112 * or /sys/block/mdX/md/sync_speed_{min,max}
115 static int sysctl_speed_limit_min = 1000;
116 static int sysctl_speed_limit_max = 200000;
117 static inline int speed_min(struct mddev *mddev)
119 return mddev->sync_speed_min ?
120 mddev->sync_speed_min : sysctl_speed_limit_min;
123 static inline int speed_max(struct mddev *mddev)
125 return mddev->sync_speed_max ?
126 mddev->sync_speed_max : sysctl_speed_limit_max;
129 static struct ctl_table_header *raid_table_header;
131 static struct ctl_table raid_table[] = {
133 .procname = "speed_limit_min",
134 .data = &sysctl_speed_limit_min,
135 .maxlen = sizeof(int),
136 .mode = S_IRUGO|S_IWUSR,
137 .proc_handler = proc_dointvec,
140 .procname = "speed_limit_max",
141 .data = &sysctl_speed_limit_max,
142 .maxlen = sizeof(int),
143 .mode = S_IRUGO|S_IWUSR,
144 .proc_handler = proc_dointvec,
149 static struct ctl_table raid_dir_table[] = {
153 .mode = S_IRUGO|S_IXUGO,
159 static struct ctl_table raid_root_table[] = {
164 .child = raid_dir_table,
169 static const struct block_device_operations md_fops;
171 static int start_readonly;
174 * like bio_clone, but with a local bio set
177 struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs,
182 if (!mddev || !mddev->bio_set)
183 return bio_alloc(gfp_mask, nr_iovecs);
185 b = bio_alloc_bioset(gfp_mask, nr_iovecs, mddev->bio_set);
190 EXPORT_SYMBOL_GPL(bio_alloc_mddev);
192 struct bio *bio_clone_mddev(struct bio *bio, gfp_t gfp_mask,
195 if (!mddev || !mddev->bio_set)
196 return bio_clone(bio, gfp_mask);
198 return bio_clone_bioset(bio, gfp_mask, mddev->bio_set);
200 EXPORT_SYMBOL_GPL(bio_clone_mddev);
203 * We have a system wide 'event count' that is incremented
204 * on any 'interesting' event, and readers of /proc/mdstat
205 * can use 'poll' or 'select' to find out when the event
209 * start array, stop array, error, add device, remove device,
210 * start build, activate spare
212 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
213 static atomic_t md_event_count;
214 void md_new_event(struct mddev *mddev)
216 atomic_inc(&md_event_count);
217 wake_up(&md_event_waiters);
219 EXPORT_SYMBOL_GPL(md_new_event);
222 * Enables to iterate over all existing md arrays
223 * all_mddevs_lock protects this list.
225 static LIST_HEAD(all_mddevs);
226 static DEFINE_SPINLOCK(all_mddevs_lock);
229 * iterates through all used mddevs in the system.
230 * We take care to grab the all_mddevs_lock whenever navigating
231 * the list, and to always hold a refcount when unlocked.
232 * Any code which breaks out of this loop while own
233 * a reference to the current mddev and must mddev_put it.
235 #define for_each_mddev(_mddev,_tmp) \
237 for (({ spin_lock(&all_mddevs_lock); \
238 _tmp = all_mddevs.next; \
240 ({ if (_tmp != &all_mddevs) \
241 mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\
242 spin_unlock(&all_mddevs_lock); \
243 if (_mddev) mddev_put(_mddev); \
244 _mddev = list_entry(_tmp, struct mddev, all_mddevs); \
245 _tmp != &all_mddevs;}); \
246 ({ spin_lock(&all_mddevs_lock); \
247 _tmp = _tmp->next;}) \
250 /* Rather than calling directly into the personality make_request function,
251 * IO requests come here first so that we can check if the device is
252 * being suspended pending a reconfiguration.
253 * We hold a refcount over the call to ->make_request. By the time that
254 * call has finished, the bio has been linked into some internal structure
255 * and so is visible to ->quiesce(), so we don't need the refcount any more.
257 static blk_qc_t md_make_request(struct request_queue *q, struct bio *bio)
259 const int rw = bio_data_dir(bio);
260 struct mddev *mddev = q->queuedata;
261 unsigned int sectors;
264 blk_queue_split(q, &bio, q->bio_split);
266 if (mddev == NULL || mddev->pers == NULL) {
268 return BLK_QC_T_NONE;
270 if (mddev->ro == 1 && unlikely(rw == WRITE)) {
271 if (bio_sectors(bio) != 0)
272 bio->bi_error = -EROFS;
274 return BLK_QC_T_NONE;
276 smp_rmb(); /* Ensure implications of 'active' are visible */
278 if (mddev->suspended) {
281 prepare_to_wait(&mddev->sb_wait, &__wait,
282 TASK_UNINTERRUPTIBLE);
283 if (!mddev->suspended)
289 finish_wait(&mddev->sb_wait, &__wait);
291 atomic_inc(&mddev->active_io);
295 * save the sectors now since our bio can
296 * go away inside make_request
298 sectors = bio_sectors(bio);
299 /* bio could be mergeable after passing to underlayer */
300 bio->bi_opf &= ~REQ_NOMERGE;
301 mddev->pers->make_request(mddev, bio);
303 cpu = part_stat_lock();
304 part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]);
305 part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw], sectors);
308 if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended)
309 wake_up(&mddev->sb_wait);
311 return BLK_QC_T_NONE;
314 /* mddev_suspend makes sure no new requests are submitted
315 * to the device, and that any requests that have been submitted
316 * are completely handled.
317 * Once mddev_detach() is called and completes, the module will be
320 void mddev_suspend(struct mddev *mddev)
322 WARN_ON_ONCE(mddev->thread && current == mddev->thread->tsk);
323 if (mddev->suspended++)
326 wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0);
327 mddev->pers->quiesce(mddev, 1);
329 del_timer_sync(&mddev->safemode_timer);
331 EXPORT_SYMBOL_GPL(mddev_suspend);
333 void mddev_resume(struct mddev *mddev)
335 if (--mddev->suspended)
337 wake_up(&mddev->sb_wait);
338 mddev->pers->quiesce(mddev, 0);
340 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
341 md_wakeup_thread(mddev->thread);
342 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
344 EXPORT_SYMBOL_GPL(mddev_resume);
346 int mddev_congested(struct mddev *mddev, int bits)
348 struct md_personality *pers = mddev->pers;
352 if (mddev->suspended)
354 else if (pers && pers->congested)
355 ret = pers->congested(mddev, bits);
359 EXPORT_SYMBOL_GPL(mddev_congested);
360 static int md_congested(void *data, int bits)
362 struct mddev *mddev = data;
363 return mddev_congested(mddev, bits);
367 * Generic flush handling for md
370 static void md_end_flush(struct bio *bio)
372 struct md_rdev *rdev = bio->bi_private;
373 struct mddev *mddev = rdev->mddev;
375 rdev_dec_pending(rdev, mddev);
377 if (atomic_dec_and_test(&mddev->flush_pending)) {
378 /* The pre-request flush has finished */
379 queue_work(md_wq, &mddev->flush_work);
384 static void md_submit_flush_data(struct work_struct *ws);
386 static void submit_flushes(struct work_struct *ws)
388 struct mddev *mddev = container_of(ws, struct mddev, flush_work);
389 struct md_rdev *rdev;
391 INIT_WORK(&mddev->flush_work, md_submit_flush_data);
392 atomic_set(&mddev->flush_pending, 1);
394 rdev_for_each_rcu(rdev, mddev)
395 if (rdev->raid_disk >= 0 &&
396 !test_bit(Faulty, &rdev->flags)) {
397 /* Take two references, one is dropped
398 * when request finishes, one after
399 * we reclaim rcu_read_lock
402 atomic_inc(&rdev->nr_pending);
403 atomic_inc(&rdev->nr_pending);
405 bi = bio_alloc_mddev(GFP_NOIO, 0, mddev);
406 bi->bi_end_io = md_end_flush;
407 bi->bi_private = rdev;
408 bi->bi_bdev = rdev->bdev;
409 bio_set_op_attrs(bi, REQ_OP_WRITE, WRITE_FLUSH);
410 atomic_inc(&mddev->flush_pending);
413 rdev_dec_pending(rdev, mddev);
416 if (atomic_dec_and_test(&mddev->flush_pending))
417 queue_work(md_wq, &mddev->flush_work);
420 static void md_submit_flush_data(struct work_struct *ws)
422 struct mddev *mddev = container_of(ws, struct mddev, flush_work);
423 struct bio *bio = mddev->flush_bio;
425 if (bio->bi_iter.bi_size == 0)
426 /* an empty barrier - all done */
429 bio->bi_opf &= ~REQ_PREFLUSH;
430 mddev->pers->make_request(mddev, bio);
433 mddev->flush_bio = NULL;
434 wake_up(&mddev->sb_wait);
437 void md_flush_request(struct mddev *mddev, struct bio *bio)
439 spin_lock_irq(&mddev->lock);
440 wait_event_lock_irq(mddev->sb_wait,
443 mddev->flush_bio = bio;
444 spin_unlock_irq(&mddev->lock);
446 INIT_WORK(&mddev->flush_work, submit_flushes);
447 queue_work(md_wq, &mddev->flush_work);
449 EXPORT_SYMBOL(md_flush_request);
451 void md_unplug(struct blk_plug_cb *cb, bool from_schedule)
453 struct mddev *mddev = cb->data;
454 md_wakeup_thread(mddev->thread);
457 EXPORT_SYMBOL(md_unplug);
459 static inline struct mddev *mddev_get(struct mddev *mddev)
461 atomic_inc(&mddev->active);
465 static void mddev_delayed_delete(struct work_struct *ws);
467 static void mddev_put(struct mddev *mddev)
469 struct bio_set *bs = NULL;
471 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
473 if (!mddev->raid_disks && list_empty(&mddev->disks) &&
474 mddev->ctime == 0 && !mddev->hold_active) {
475 /* Array is not configured at all, and not held active,
477 list_del_init(&mddev->all_mddevs);
479 mddev->bio_set = NULL;
480 if (mddev->gendisk) {
481 /* We did a probe so need to clean up. Call
482 * queue_work inside the spinlock so that
483 * flush_workqueue() after mddev_find will
484 * succeed in waiting for the work to be done.
486 INIT_WORK(&mddev->del_work, mddev_delayed_delete);
487 queue_work(md_misc_wq, &mddev->del_work);
491 spin_unlock(&all_mddevs_lock);
496 static void md_safemode_timeout(unsigned long data);
498 void mddev_init(struct mddev *mddev)
500 mutex_init(&mddev->open_mutex);
501 mutex_init(&mddev->reconfig_mutex);
502 mutex_init(&mddev->bitmap_info.mutex);
503 INIT_LIST_HEAD(&mddev->disks);
504 INIT_LIST_HEAD(&mddev->all_mddevs);
505 setup_timer(&mddev->safemode_timer, md_safemode_timeout,
506 (unsigned long) mddev);
507 atomic_set(&mddev->active, 1);
508 atomic_set(&mddev->openers, 0);
509 atomic_set(&mddev->active_io, 0);
510 spin_lock_init(&mddev->lock);
511 atomic_set(&mddev->flush_pending, 0);
512 init_waitqueue_head(&mddev->sb_wait);
513 init_waitqueue_head(&mddev->recovery_wait);
514 mddev->reshape_position = MaxSector;
515 mddev->reshape_backwards = 0;
516 mddev->last_sync_action = "none";
517 mddev->resync_min = 0;
518 mddev->resync_max = MaxSector;
519 mddev->level = LEVEL_NONE;
521 EXPORT_SYMBOL_GPL(mddev_init);
523 static struct mddev *mddev_find(dev_t unit)
525 struct mddev *mddev, *new = NULL;
527 if (unit && MAJOR(unit) != MD_MAJOR)
528 unit &= ~((1<<MdpMinorShift)-1);
531 spin_lock(&all_mddevs_lock);
534 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
535 if (mddev->unit == unit) {
537 spin_unlock(&all_mddevs_lock);
543 list_add(&new->all_mddevs, &all_mddevs);
544 spin_unlock(&all_mddevs_lock);
545 new->hold_active = UNTIL_IOCTL;
549 /* find an unused unit number */
550 static int next_minor = 512;
551 int start = next_minor;
555 dev = MKDEV(MD_MAJOR, next_minor);
557 if (next_minor > MINORMASK)
559 if (next_minor == start) {
560 /* Oh dear, all in use. */
561 spin_unlock(&all_mddevs_lock);
567 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
568 if (mddev->unit == dev) {
574 new->md_minor = MINOR(dev);
575 new->hold_active = UNTIL_STOP;
576 list_add(&new->all_mddevs, &all_mddevs);
577 spin_unlock(&all_mddevs_lock);
580 spin_unlock(&all_mddevs_lock);
582 new = kzalloc(sizeof(*new), GFP_KERNEL);
587 if (MAJOR(unit) == MD_MAJOR)
588 new->md_minor = MINOR(unit);
590 new->md_minor = MINOR(unit) >> MdpMinorShift;
597 static struct attribute_group md_redundancy_group;
599 void mddev_unlock(struct mddev *mddev)
601 if (mddev->to_remove) {
602 /* These cannot be removed under reconfig_mutex as
603 * an access to the files will try to take reconfig_mutex
604 * while holding the file unremovable, which leads to
606 * So hold set sysfs_active while the remove in happeing,
607 * and anything else which might set ->to_remove or my
608 * otherwise change the sysfs namespace will fail with
609 * -EBUSY if sysfs_active is still set.
610 * We set sysfs_active under reconfig_mutex and elsewhere
611 * test it under the same mutex to ensure its correct value
614 struct attribute_group *to_remove = mddev->to_remove;
615 mddev->to_remove = NULL;
616 mddev->sysfs_active = 1;
617 mutex_unlock(&mddev->reconfig_mutex);
619 if (mddev->kobj.sd) {
620 if (to_remove != &md_redundancy_group)
621 sysfs_remove_group(&mddev->kobj, to_remove);
622 if (mddev->pers == NULL ||
623 mddev->pers->sync_request == NULL) {
624 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
625 if (mddev->sysfs_action)
626 sysfs_put(mddev->sysfs_action);
627 mddev->sysfs_action = NULL;
630 mddev->sysfs_active = 0;
632 mutex_unlock(&mddev->reconfig_mutex);
634 /* As we've dropped the mutex we need a spinlock to
635 * make sure the thread doesn't disappear
637 spin_lock(&pers_lock);
638 md_wakeup_thread(mddev->thread);
639 spin_unlock(&pers_lock);
641 EXPORT_SYMBOL_GPL(mddev_unlock);
643 struct md_rdev *md_find_rdev_nr_rcu(struct mddev *mddev, int nr)
645 struct md_rdev *rdev;
647 rdev_for_each_rcu(rdev, mddev)
648 if (rdev->desc_nr == nr)
653 EXPORT_SYMBOL_GPL(md_find_rdev_nr_rcu);
655 static struct md_rdev *find_rdev(struct mddev *mddev, dev_t dev)
657 struct md_rdev *rdev;
659 rdev_for_each(rdev, mddev)
660 if (rdev->bdev->bd_dev == dev)
666 static struct md_rdev *find_rdev_rcu(struct mddev *mddev, dev_t dev)
668 struct md_rdev *rdev;
670 rdev_for_each_rcu(rdev, mddev)
671 if (rdev->bdev->bd_dev == dev)
677 static struct md_personality *find_pers(int level, char *clevel)
679 struct md_personality *pers;
680 list_for_each_entry(pers, &pers_list, list) {
681 if (level != LEVEL_NONE && pers->level == level)
683 if (strcmp(pers->name, clevel)==0)
689 /* return the offset of the super block in 512byte sectors */
690 static inline sector_t calc_dev_sboffset(struct md_rdev *rdev)
692 sector_t num_sectors = i_size_read(rdev->bdev->bd_inode) / 512;
693 return MD_NEW_SIZE_SECTORS(num_sectors);
696 static int alloc_disk_sb(struct md_rdev *rdev)
698 rdev->sb_page = alloc_page(GFP_KERNEL);
704 void md_rdev_clear(struct md_rdev *rdev)
707 put_page(rdev->sb_page);
709 rdev->sb_page = NULL;
714 put_page(rdev->bb_page);
715 rdev->bb_page = NULL;
717 badblocks_exit(&rdev->badblocks);
719 EXPORT_SYMBOL_GPL(md_rdev_clear);
721 static void super_written(struct bio *bio)
723 struct md_rdev *rdev = bio->bi_private;
724 struct mddev *mddev = rdev->mddev;
727 pr_err("md: super_written gets error=%d\n", bio->bi_error);
728 md_error(mddev, rdev);
731 if (atomic_dec_and_test(&mddev->pending_writes))
732 wake_up(&mddev->sb_wait);
733 rdev_dec_pending(rdev, mddev);
737 void md_super_write(struct mddev *mddev, struct md_rdev *rdev,
738 sector_t sector, int size, struct page *page)
740 /* write first size bytes of page to sector of rdev
741 * Increment mddev->pending_writes before returning
742 * and decrement it on completion, waking up sb_wait
743 * if zero is reached.
744 * If an error occurred, call md_error
746 struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, mddev);
748 atomic_inc(&rdev->nr_pending);
750 bio->bi_bdev = rdev->meta_bdev ? rdev->meta_bdev : rdev->bdev;
751 bio->bi_iter.bi_sector = sector;
752 bio_add_page(bio, page, size, 0);
753 bio->bi_private = rdev;
754 bio->bi_end_io = super_written;
755 bio_set_op_attrs(bio, REQ_OP_WRITE, WRITE_FLUSH_FUA);
757 atomic_inc(&mddev->pending_writes);
761 void md_super_wait(struct mddev *mddev)
763 /* wait for all superblock writes that were scheduled to complete */
764 wait_event(mddev->sb_wait, atomic_read(&mddev->pending_writes)==0);
767 int sync_page_io(struct md_rdev *rdev, sector_t sector, int size,
768 struct page *page, int op, int op_flags, bool metadata_op)
770 struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, rdev->mddev);
773 bio->bi_bdev = (metadata_op && rdev->meta_bdev) ?
774 rdev->meta_bdev : rdev->bdev;
775 bio_set_op_attrs(bio, op, op_flags);
777 bio->bi_iter.bi_sector = sector + rdev->sb_start;
778 else if (rdev->mddev->reshape_position != MaxSector &&
779 (rdev->mddev->reshape_backwards ==
780 (sector >= rdev->mddev->reshape_position)))
781 bio->bi_iter.bi_sector = sector + rdev->new_data_offset;
783 bio->bi_iter.bi_sector = sector + rdev->data_offset;
784 bio_add_page(bio, page, size, 0);
786 submit_bio_wait(bio);
788 ret = !bio->bi_error;
792 EXPORT_SYMBOL_GPL(sync_page_io);
794 static int read_disk_sb(struct md_rdev *rdev, int size)
796 char b[BDEVNAME_SIZE];
801 if (!sync_page_io(rdev, 0, size, rdev->sb_page, REQ_OP_READ, 0, true))
807 pr_err("md: disabled device %s, could not read superblock.\n",
808 bdevname(rdev->bdev,b));
812 static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
814 return sb1->set_uuid0 == sb2->set_uuid0 &&
815 sb1->set_uuid1 == sb2->set_uuid1 &&
816 sb1->set_uuid2 == sb2->set_uuid2 &&
817 sb1->set_uuid3 == sb2->set_uuid3;
820 static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
823 mdp_super_t *tmp1, *tmp2;
825 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
826 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
828 if (!tmp1 || !tmp2) {
837 * nr_disks is not constant
842 ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0);
849 static u32 md_csum_fold(u32 csum)
851 csum = (csum & 0xffff) + (csum >> 16);
852 return (csum & 0xffff) + (csum >> 16);
855 static unsigned int calc_sb_csum(mdp_super_t *sb)
858 u32 *sb32 = (u32*)sb;
860 unsigned int disk_csum, csum;
862 disk_csum = sb->sb_csum;
865 for (i = 0; i < MD_SB_BYTES/4 ; i++)
867 csum = (newcsum & 0xffffffff) + (newcsum>>32);
870 /* This used to use csum_partial, which was wrong for several
871 * reasons including that different results are returned on
872 * different architectures. It isn't critical that we get exactly
873 * the same return value as before (we always csum_fold before
874 * testing, and that removes any differences). However as we
875 * know that csum_partial always returned a 16bit value on
876 * alphas, do a fold to maximise conformity to previous behaviour.
878 sb->sb_csum = md_csum_fold(disk_csum);
880 sb->sb_csum = disk_csum;
886 * Handle superblock details.
887 * We want to be able to handle multiple superblock formats
888 * so we have a common interface to them all, and an array of
889 * different handlers.
890 * We rely on user-space to write the initial superblock, and support
891 * reading and updating of superblocks.
892 * Interface methods are:
893 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version)
894 * loads and validates a superblock on dev.
895 * if refdev != NULL, compare superblocks on both devices
897 * 0 - dev has a superblock that is compatible with refdev
898 * 1 - dev has a superblock that is compatible and newer than refdev
899 * so dev should be used as the refdev in future
900 * -EINVAL superblock incompatible or invalid
901 * -othererror e.g. -EIO
903 * int validate_super(struct mddev *mddev, struct md_rdev *dev)
904 * Verify that dev is acceptable into mddev.
905 * The first time, mddev->raid_disks will be 0, and data from
906 * dev should be merged in. Subsequent calls check that dev
907 * is new enough. Return 0 or -EINVAL
909 * void sync_super(struct mddev *mddev, struct md_rdev *dev)
910 * Update the superblock for rdev with data in mddev
911 * This does not write to disc.
917 struct module *owner;
918 int (*load_super)(struct md_rdev *rdev,
919 struct md_rdev *refdev,
921 int (*validate_super)(struct mddev *mddev,
922 struct md_rdev *rdev);
923 void (*sync_super)(struct mddev *mddev,
924 struct md_rdev *rdev);
925 unsigned long long (*rdev_size_change)(struct md_rdev *rdev,
926 sector_t num_sectors);
927 int (*allow_new_offset)(struct md_rdev *rdev,
928 unsigned long long new_offset);
932 * Check that the given mddev has no bitmap.
934 * This function is called from the run method of all personalities that do not
935 * support bitmaps. It prints an error message and returns non-zero if mddev
936 * has a bitmap. Otherwise, it returns 0.
939 int md_check_no_bitmap(struct mddev *mddev)
941 if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset)
943 pr_warn("%s: bitmaps are not supported for %s\n",
944 mdname(mddev), mddev->pers->name);
947 EXPORT_SYMBOL(md_check_no_bitmap);
950 * load_super for 0.90.0
952 static int super_90_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
954 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
959 * Calculate the position of the superblock (512byte sectors),
960 * it's at the end of the disk.
962 * It also happens to be a multiple of 4Kb.
964 rdev->sb_start = calc_dev_sboffset(rdev);
966 ret = read_disk_sb(rdev, MD_SB_BYTES);
972 bdevname(rdev->bdev, b);
973 sb = page_address(rdev->sb_page);
975 if (sb->md_magic != MD_SB_MAGIC) {
976 pr_warn("md: invalid raid superblock magic on %s\n", b);
980 if (sb->major_version != 0 ||
981 sb->minor_version < 90 ||
982 sb->minor_version > 91) {
983 pr_warn("Bad version number %d.%d on %s\n",
984 sb->major_version, sb->minor_version, b);
988 if (sb->raid_disks <= 0)
991 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
992 pr_warn("md: invalid superblock checksum on %s\n", b);
996 rdev->preferred_minor = sb->md_minor;
997 rdev->data_offset = 0;
998 rdev->new_data_offset = 0;
999 rdev->sb_size = MD_SB_BYTES;
1000 rdev->badblocks.shift = -1;
1002 if (sb->level == LEVEL_MULTIPATH)
1005 rdev->desc_nr = sb->this_disk.number;
1011 mdp_super_t *refsb = page_address(refdev->sb_page);
1012 if (!uuid_equal(refsb, sb)) {
1013 pr_warn("md: %s has different UUID to %s\n",
1014 b, bdevname(refdev->bdev,b2));
1017 if (!sb_equal(refsb, sb)) {
1018 pr_warn("md: %s has same UUID but different superblock to %s\n",
1019 b, bdevname(refdev->bdev, b2));
1023 ev2 = md_event(refsb);
1029 rdev->sectors = rdev->sb_start;
1030 /* Limit to 4TB as metadata cannot record more than that.
1031 * (not needed for Linear and RAID0 as metadata doesn't
1034 if (IS_ENABLED(CONFIG_LBDAF) && (u64)rdev->sectors >= (2ULL << 32) &&
1036 rdev->sectors = (sector_t)(2ULL << 32) - 2;
1038 if (rdev->sectors < ((sector_t)sb->size) * 2 && sb->level >= 1)
1039 /* "this cannot possibly happen" ... */
1047 * validate_super for 0.90.0
1049 static int super_90_validate(struct mddev *mddev, struct md_rdev *rdev)
1052 mdp_super_t *sb = page_address(rdev->sb_page);
1053 __u64 ev1 = md_event(sb);
1055 rdev->raid_disk = -1;
1056 clear_bit(Faulty, &rdev->flags);
1057 clear_bit(In_sync, &rdev->flags);
1058 clear_bit(Bitmap_sync, &rdev->flags);
1059 clear_bit(WriteMostly, &rdev->flags);
1061 if (mddev->raid_disks == 0) {
1062 mddev->major_version = 0;
1063 mddev->minor_version = sb->minor_version;
1064 mddev->patch_version = sb->patch_version;
1065 mddev->external = 0;
1066 mddev->chunk_sectors = sb->chunk_size >> 9;
1067 mddev->ctime = sb->ctime;
1068 mddev->utime = sb->utime;
1069 mddev->level = sb->level;
1070 mddev->clevel[0] = 0;
1071 mddev->layout = sb->layout;
1072 mddev->raid_disks = sb->raid_disks;
1073 mddev->dev_sectors = ((sector_t)sb->size) * 2;
1074 mddev->events = ev1;
1075 mddev->bitmap_info.offset = 0;
1076 mddev->bitmap_info.space = 0;
1077 /* bitmap can use 60 K after the 4K superblocks */
1078 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
1079 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
1080 mddev->reshape_backwards = 0;
1082 if (mddev->minor_version >= 91) {
1083 mddev->reshape_position = sb->reshape_position;
1084 mddev->delta_disks = sb->delta_disks;
1085 mddev->new_level = sb->new_level;
1086 mddev->new_layout = sb->new_layout;
1087 mddev->new_chunk_sectors = sb->new_chunk >> 9;
1088 if (mddev->delta_disks < 0)
1089 mddev->reshape_backwards = 1;
1091 mddev->reshape_position = MaxSector;
1092 mddev->delta_disks = 0;
1093 mddev->new_level = mddev->level;
1094 mddev->new_layout = mddev->layout;
1095 mddev->new_chunk_sectors = mddev->chunk_sectors;
1098 if (sb->state & (1<<MD_SB_CLEAN))
1099 mddev->recovery_cp = MaxSector;
1101 if (sb->events_hi == sb->cp_events_hi &&
1102 sb->events_lo == sb->cp_events_lo) {
1103 mddev->recovery_cp = sb->recovery_cp;
1105 mddev->recovery_cp = 0;
1108 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
1109 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
1110 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
1111 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
1113 mddev->max_disks = MD_SB_DISKS;
1115 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
1116 mddev->bitmap_info.file == NULL) {
1117 mddev->bitmap_info.offset =
1118 mddev->bitmap_info.default_offset;
1119 mddev->bitmap_info.space =
1120 mddev->bitmap_info.default_space;
1123 } else if (mddev->pers == NULL) {
1124 /* Insist on good event counter while assembling, except
1125 * for spares (which don't need an event count) */
1127 if (sb->disks[rdev->desc_nr].state & (
1128 (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE)))
1129 if (ev1 < mddev->events)
1131 } else if (mddev->bitmap) {
1132 /* if adding to array with a bitmap, then we can accept an
1133 * older device ... but not too old.
1135 if (ev1 < mddev->bitmap->events_cleared)
1137 if (ev1 < mddev->events)
1138 set_bit(Bitmap_sync, &rdev->flags);
1140 if (ev1 < mddev->events)
1141 /* just a hot-add of a new device, leave raid_disk at -1 */
1145 if (mddev->level != LEVEL_MULTIPATH) {
1146 desc = sb->disks + rdev->desc_nr;
1148 if (desc->state & (1<<MD_DISK_FAULTY))
1149 set_bit(Faulty, &rdev->flags);
1150 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
1151 desc->raid_disk < mddev->raid_disks */) {
1152 set_bit(In_sync, &rdev->flags);
1153 rdev->raid_disk = desc->raid_disk;
1154 rdev->saved_raid_disk = desc->raid_disk;
1155 } else if (desc->state & (1<<MD_DISK_ACTIVE)) {
1156 /* active but not in sync implies recovery up to
1157 * reshape position. We don't know exactly where
1158 * that is, so set to zero for now */
1159 if (mddev->minor_version >= 91) {
1160 rdev->recovery_offset = 0;
1161 rdev->raid_disk = desc->raid_disk;
1164 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
1165 set_bit(WriteMostly, &rdev->flags);
1166 } else /* MULTIPATH are always insync */
1167 set_bit(In_sync, &rdev->flags);
1172 * sync_super for 0.90.0
1174 static void super_90_sync(struct mddev *mddev, struct md_rdev *rdev)
1177 struct md_rdev *rdev2;
1178 int next_spare = mddev->raid_disks;
1180 /* make rdev->sb match mddev data..
1183 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1184 * 3/ any empty disks < next_spare become removed
1186 * disks[0] gets initialised to REMOVED because
1187 * we cannot be sure from other fields if it has
1188 * been initialised or not.
1191 int active=0, working=0,failed=0,spare=0,nr_disks=0;
1193 rdev->sb_size = MD_SB_BYTES;
1195 sb = page_address(rdev->sb_page);
1197 memset(sb, 0, sizeof(*sb));
1199 sb->md_magic = MD_SB_MAGIC;
1200 sb->major_version = mddev->major_version;
1201 sb->patch_version = mddev->patch_version;
1202 sb->gvalid_words = 0; /* ignored */
1203 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
1204 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
1205 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
1206 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
1208 sb->ctime = clamp_t(time64_t, mddev->ctime, 0, U32_MAX);
1209 sb->level = mddev->level;
1210 sb->size = mddev->dev_sectors / 2;
1211 sb->raid_disks = mddev->raid_disks;
1212 sb->md_minor = mddev->md_minor;
1213 sb->not_persistent = 0;
1214 sb->utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX);
1216 sb->events_hi = (mddev->events>>32);
1217 sb->events_lo = (u32)mddev->events;
1219 if (mddev->reshape_position == MaxSector)
1220 sb->minor_version = 90;
1222 sb->minor_version = 91;
1223 sb->reshape_position = mddev->reshape_position;
1224 sb->new_level = mddev->new_level;
1225 sb->delta_disks = mddev->delta_disks;
1226 sb->new_layout = mddev->new_layout;
1227 sb->new_chunk = mddev->new_chunk_sectors << 9;
1229 mddev->minor_version = sb->minor_version;
1232 sb->recovery_cp = mddev->recovery_cp;
1233 sb->cp_events_hi = (mddev->events>>32);
1234 sb->cp_events_lo = (u32)mddev->events;
1235 if (mddev->recovery_cp == MaxSector)
1236 sb->state = (1<< MD_SB_CLEAN);
1238 sb->recovery_cp = 0;
1240 sb->layout = mddev->layout;
1241 sb->chunk_size = mddev->chunk_sectors << 9;
1243 if (mddev->bitmap && mddev->bitmap_info.file == NULL)
1244 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
1246 sb->disks[0].state = (1<<MD_DISK_REMOVED);
1247 rdev_for_each(rdev2, mddev) {
1250 int is_active = test_bit(In_sync, &rdev2->flags);
1252 if (rdev2->raid_disk >= 0 &&
1253 sb->minor_version >= 91)
1254 /* we have nowhere to store the recovery_offset,
1255 * but if it is not below the reshape_position,
1256 * we can piggy-back on that.
1259 if (rdev2->raid_disk < 0 ||
1260 test_bit(Faulty, &rdev2->flags))
1263 desc_nr = rdev2->raid_disk;
1265 desc_nr = next_spare++;
1266 rdev2->desc_nr = desc_nr;
1267 d = &sb->disks[rdev2->desc_nr];
1269 d->number = rdev2->desc_nr;
1270 d->major = MAJOR(rdev2->bdev->bd_dev);
1271 d->minor = MINOR(rdev2->bdev->bd_dev);
1273 d->raid_disk = rdev2->raid_disk;
1275 d->raid_disk = rdev2->desc_nr; /* compatibility */
1276 if (test_bit(Faulty, &rdev2->flags))
1277 d->state = (1<<MD_DISK_FAULTY);
1278 else if (is_active) {
1279 d->state = (1<<MD_DISK_ACTIVE);
1280 if (test_bit(In_sync, &rdev2->flags))
1281 d->state |= (1<<MD_DISK_SYNC);
1289 if (test_bit(WriteMostly, &rdev2->flags))
1290 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1292 /* now set the "removed" and "faulty" bits on any missing devices */
1293 for (i=0 ; i < mddev->raid_disks ; i++) {
1294 mdp_disk_t *d = &sb->disks[i];
1295 if (d->state == 0 && d->number == 0) {
1298 d->state = (1<<MD_DISK_REMOVED);
1299 d->state |= (1<<MD_DISK_FAULTY);
1303 sb->nr_disks = nr_disks;
1304 sb->active_disks = active;
1305 sb->working_disks = working;
1306 sb->failed_disks = failed;
1307 sb->spare_disks = spare;
1309 sb->this_disk = sb->disks[rdev->desc_nr];
1310 sb->sb_csum = calc_sb_csum(sb);
1314 * rdev_size_change for 0.90.0
1316 static unsigned long long
1317 super_90_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
1319 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1320 return 0; /* component must fit device */
1321 if (rdev->mddev->bitmap_info.offset)
1322 return 0; /* can't move bitmap */
1323 rdev->sb_start = calc_dev_sboffset(rdev);
1324 if (!num_sectors || num_sectors > rdev->sb_start)
1325 num_sectors = rdev->sb_start;
1326 /* Limit to 4TB as metadata cannot record more than that.
1327 * 4TB == 2^32 KB, or 2*2^32 sectors.
1329 if (IS_ENABLED(CONFIG_LBDAF) && (u64)num_sectors >= (2ULL << 32) &&
1330 rdev->mddev->level >= 1)
1331 num_sectors = (sector_t)(2ULL << 32) - 2;
1332 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1334 md_super_wait(rdev->mddev);
1339 super_90_allow_new_offset(struct md_rdev *rdev, unsigned long long new_offset)
1341 /* non-zero offset changes not possible with v0.90 */
1342 return new_offset == 0;
1346 * version 1 superblock
1349 static __le32 calc_sb_1_csum(struct mdp_superblock_1 *sb)
1353 unsigned long long newcsum;
1354 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1355 __le32 *isuper = (__le32*)sb;
1357 disk_csum = sb->sb_csum;
1360 for (; size >= 4; size -= 4)
1361 newcsum += le32_to_cpu(*isuper++);
1364 newcsum += le16_to_cpu(*(__le16*) isuper);
1366 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1367 sb->sb_csum = disk_csum;
1368 return cpu_to_le32(csum);
1371 static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
1373 struct mdp_superblock_1 *sb;
1377 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1381 * Calculate the position of the superblock in 512byte sectors.
1382 * It is always aligned to a 4K boundary and
1383 * depeding on minor_version, it can be:
1384 * 0: At least 8K, but less than 12K, from end of device
1385 * 1: At start of device
1386 * 2: 4K from start of device.
1388 switch(minor_version) {
1390 sb_start = i_size_read(rdev->bdev->bd_inode) >> 9;
1392 sb_start &= ~(sector_t)(4*2-1);
1403 rdev->sb_start = sb_start;
1405 /* superblock is rarely larger than 1K, but it can be larger,
1406 * and it is safe to read 4k, so we do that
1408 ret = read_disk_sb(rdev, 4096);
1409 if (ret) return ret;
1411 sb = page_address(rdev->sb_page);
1413 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1414 sb->major_version != cpu_to_le32(1) ||
1415 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1416 le64_to_cpu(sb->super_offset) != rdev->sb_start ||
1417 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1420 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1421 pr_warn("md: invalid superblock checksum on %s\n",
1422 bdevname(rdev->bdev,b));
1425 if (le64_to_cpu(sb->data_size) < 10) {
1426 pr_warn("md: data_size too small on %s\n",
1427 bdevname(rdev->bdev,b));
1432 memcmp(sb->pad3, sb->pad3+1, sizeof(sb->pad3) - sizeof(sb->pad3[1])))
1433 /* Some padding is non-zero, might be a new feature */
1436 rdev->preferred_minor = 0xffff;
1437 rdev->data_offset = le64_to_cpu(sb->data_offset);
1438 rdev->new_data_offset = rdev->data_offset;
1439 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE) &&
1440 (le32_to_cpu(sb->feature_map) & MD_FEATURE_NEW_OFFSET))
1441 rdev->new_data_offset += (s32)le32_to_cpu(sb->new_offset);
1442 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1444 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1445 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1446 if (rdev->sb_size & bmask)
1447 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1450 && rdev->data_offset < sb_start + (rdev->sb_size/512))
1453 && rdev->new_data_offset < sb_start + (rdev->sb_size/512))
1456 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1459 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1461 if (!rdev->bb_page) {
1462 rdev->bb_page = alloc_page(GFP_KERNEL);
1466 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BAD_BLOCKS) &&
1467 rdev->badblocks.count == 0) {
1468 /* need to load the bad block list.
1469 * Currently we limit it to one page.
1475 int sectors = le16_to_cpu(sb->bblog_size);
1476 if (sectors > (PAGE_SIZE / 512))
1478 offset = le32_to_cpu(sb->bblog_offset);
1481 bb_sector = (long long)offset;
1482 if (!sync_page_io(rdev, bb_sector, sectors << 9,
1483 rdev->bb_page, REQ_OP_READ, 0, true))
1485 bbp = (u64 *)page_address(rdev->bb_page);
1486 rdev->badblocks.shift = sb->bblog_shift;
1487 for (i = 0 ; i < (sectors << (9-3)) ; i++, bbp++) {
1488 u64 bb = le64_to_cpu(*bbp);
1489 int count = bb & (0x3ff);
1490 u64 sector = bb >> 10;
1491 sector <<= sb->bblog_shift;
1492 count <<= sb->bblog_shift;
1495 if (badblocks_set(&rdev->badblocks, sector, count, 1))
1498 } else if (sb->bblog_offset != 0)
1499 rdev->badblocks.shift = 0;
1505 struct mdp_superblock_1 *refsb = page_address(refdev->sb_page);
1507 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1508 sb->level != refsb->level ||
1509 sb->layout != refsb->layout ||
1510 sb->chunksize != refsb->chunksize) {
1511 pr_warn("md: %s has strangely different superblock to %s\n",
1512 bdevname(rdev->bdev,b),
1513 bdevname(refdev->bdev,b2));
1516 ev1 = le64_to_cpu(sb->events);
1517 ev2 = le64_to_cpu(refsb->events);
1524 if (minor_version) {
1525 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9);
1526 sectors -= rdev->data_offset;
1528 sectors = rdev->sb_start;
1529 if (sectors < le64_to_cpu(sb->data_size))
1531 rdev->sectors = le64_to_cpu(sb->data_size);
1535 static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev)
1537 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
1538 __u64 ev1 = le64_to_cpu(sb->events);
1540 rdev->raid_disk = -1;
1541 clear_bit(Faulty, &rdev->flags);
1542 clear_bit(In_sync, &rdev->flags);
1543 clear_bit(Bitmap_sync, &rdev->flags);
1544 clear_bit(WriteMostly, &rdev->flags);
1546 if (mddev->raid_disks == 0) {
1547 mddev->major_version = 1;
1548 mddev->patch_version = 0;
1549 mddev->external = 0;
1550 mddev->chunk_sectors = le32_to_cpu(sb->chunksize);
1551 mddev->ctime = le64_to_cpu(sb->ctime);
1552 mddev->utime = le64_to_cpu(sb->utime);
1553 mddev->level = le32_to_cpu(sb->level);
1554 mddev->clevel[0] = 0;
1555 mddev->layout = le32_to_cpu(sb->layout);
1556 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1557 mddev->dev_sectors = le64_to_cpu(sb->size);
1558 mddev->events = ev1;
1559 mddev->bitmap_info.offset = 0;
1560 mddev->bitmap_info.space = 0;
1561 /* Default location for bitmap is 1K after superblock
1562 * using 3K - total of 4K
1564 mddev->bitmap_info.default_offset = 1024 >> 9;
1565 mddev->bitmap_info.default_space = (4096-1024) >> 9;
1566 mddev->reshape_backwards = 0;
1568 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1569 memcpy(mddev->uuid, sb->set_uuid, 16);
1571 mddev->max_disks = (4096-256)/2;
1573 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1574 mddev->bitmap_info.file == NULL) {
1575 mddev->bitmap_info.offset =
1576 (__s32)le32_to_cpu(sb->bitmap_offset);
1577 /* Metadata doesn't record how much space is available.
1578 * For 1.0, we assume we can use up to the superblock
1579 * if before, else to 4K beyond superblock.
1580 * For others, assume no change is possible.
1582 if (mddev->minor_version > 0)
1583 mddev->bitmap_info.space = 0;
1584 else if (mddev->bitmap_info.offset > 0)
1585 mddev->bitmap_info.space =
1586 8 - mddev->bitmap_info.offset;
1588 mddev->bitmap_info.space =
1589 -mddev->bitmap_info.offset;
1592 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1593 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1594 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1595 mddev->new_level = le32_to_cpu(sb->new_level);
1596 mddev->new_layout = le32_to_cpu(sb->new_layout);
1597 mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk);
1598 if (mddev->delta_disks < 0 ||
1599 (mddev->delta_disks == 0 &&
1600 (le32_to_cpu(sb->feature_map)
1601 & MD_FEATURE_RESHAPE_BACKWARDS)))
1602 mddev->reshape_backwards = 1;
1604 mddev->reshape_position = MaxSector;
1605 mddev->delta_disks = 0;
1606 mddev->new_level = mddev->level;
1607 mddev->new_layout = mddev->layout;
1608 mddev->new_chunk_sectors = mddev->chunk_sectors;
1611 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL)
1612 set_bit(MD_HAS_JOURNAL, &mddev->flags);
1613 } else if (mddev->pers == NULL) {
1614 /* Insist of good event counter while assembling, except for
1615 * spares (which don't need an event count) */
1617 if (rdev->desc_nr >= 0 &&
1618 rdev->desc_nr < le32_to_cpu(sb->max_dev) &&
1619 (le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < MD_DISK_ROLE_MAX ||
1620 le16_to_cpu(sb->dev_roles[rdev->desc_nr]) == MD_DISK_ROLE_JOURNAL))
1621 if (ev1 < mddev->events)
1623 } else if (mddev->bitmap) {
1624 /* If adding to array with a bitmap, then we can accept an
1625 * older device, but not too old.
1627 if (ev1 < mddev->bitmap->events_cleared)
1629 if (ev1 < mddev->events)
1630 set_bit(Bitmap_sync, &rdev->flags);
1632 if (ev1 < mddev->events)
1633 /* just a hot-add of a new device, leave raid_disk at -1 */
1636 if (mddev->level != LEVEL_MULTIPATH) {
1638 if (rdev->desc_nr < 0 ||
1639 rdev->desc_nr >= le32_to_cpu(sb->max_dev)) {
1640 role = MD_DISK_ROLE_SPARE;
1643 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1645 case MD_DISK_ROLE_SPARE: /* spare */
1647 case MD_DISK_ROLE_FAULTY: /* faulty */
1648 set_bit(Faulty, &rdev->flags);
1650 case MD_DISK_ROLE_JOURNAL: /* journal device */
1651 if (!(le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL)) {
1652 /* journal device without journal feature */
1653 pr_warn("md: journal device provided without journal feature, ignoring the device\n");
1656 set_bit(Journal, &rdev->flags);
1657 rdev->journal_tail = le64_to_cpu(sb->journal_tail);
1658 rdev->raid_disk = 0;
1661 rdev->saved_raid_disk = role;
1662 if ((le32_to_cpu(sb->feature_map) &
1663 MD_FEATURE_RECOVERY_OFFSET)) {
1664 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1665 if (!(le32_to_cpu(sb->feature_map) &
1666 MD_FEATURE_RECOVERY_BITMAP))
1667 rdev->saved_raid_disk = -1;
1669 set_bit(In_sync, &rdev->flags);
1670 rdev->raid_disk = role;
1673 if (sb->devflags & WriteMostly1)
1674 set_bit(WriteMostly, &rdev->flags);
1675 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_REPLACEMENT)
1676 set_bit(Replacement, &rdev->flags);
1677 } else /* MULTIPATH are always insync */
1678 set_bit(In_sync, &rdev->flags);
1683 static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev)
1685 struct mdp_superblock_1 *sb;
1686 struct md_rdev *rdev2;
1688 /* make rdev->sb match mddev and rdev data. */
1690 sb = page_address(rdev->sb_page);
1692 sb->feature_map = 0;
1694 sb->recovery_offset = cpu_to_le64(0);
1695 memset(sb->pad3, 0, sizeof(sb->pad3));
1697 sb->utime = cpu_to_le64((__u64)mddev->utime);
1698 sb->events = cpu_to_le64(mddev->events);
1700 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1701 else if (test_bit(MD_JOURNAL_CLEAN, &mddev->flags))
1702 sb->resync_offset = cpu_to_le64(MaxSector);
1704 sb->resync_offset = cpu_to_le64(0);
1706 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
1708 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
1709 sb->size = cpu_to_le64(mddev->dev_sectors);
1710 sb->chunksize = cpu_to_le32(mddev->chunk_sectors);
1711 sb->level = cpu_to_le32(mddev->level);
1712 sb->layout = cpu_to_le32(mddev->layout);
1714 if (test_bit(WriteMostly, &rdev->flags))
1715 sb->devflags |= WriteMostly1;
1717 sb->devflags &= ~WriteMostly1;
1718 sb->data_offset = cpu_to_le64(rdev->data_offset);
1719 sb->data_size = cpu_to_le64(rdev->sectors);
1721 if (mddev->bitmap && mddev->bitmap_info.file == NULL) {
1722 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset);
1723 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
1726 if (rdev->raid_disk >= 0 && !test_bit(Journal, &rdev->flags) &&
1727 !test_bit(In_sync, &rdev->flags)) {
1729 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1730 sb->recovery_offset =
1731 cpu_to_le64(rdev->recovery_offset);
1732 if (rdev->saved_raid_disk >= 0 && mddev->bitmap)
1734 cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP);
1736 /* Note: recovery_offset and journal_tail share space */
1737 if (test_bit(Journal, &rdev->flags))
1738 sb->journal_tail = cpu_to_le64(rdev->journal_tail);
1739 if (test_bit(Replacement, &rdev->flags))
1741 cpu_to_le32(MD_FEATURE_REPLACEMENT);
1743 if (mddev->reshape_position != MaxSector) {
1744 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1745 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1746 sb->new_layout = cpu_to_le32(mddev->new_layout);
1747 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1748 sb->new_level = cpu_to_le32(mddev->new_level);
1749 sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors);
1750 if (mddev->delta_disks == 0 &&
1751 mddev->reshape_backwards)
1753 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS);
1754 if (rdev->new_data_offset != rdev->data_offset) {
1756 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET);
1757 sb->new_offset = cpu_to_le32((__u32)(rdev->new_data_offset
1758 - rdev->data_offset));
1762 if (mddev_is_clustered(mddev))
1763 sb->feature_map |= cpu_to_le32(MD_FEATURE_CLUSTERED);
1765 if (rdev->badblocks.count == 0)
1766 /* Nothing to do for bad blocks*/ ;
1767 else if (sb->bblog_offset == 0)
1768 /* Cannot record bad blocks on this device */
1769 md_error(mddev, rdev);
1771 struct badblocks *bb = &rdev->badblocks;
1772 u64 *bbp = (u64 *)page_address(rdev->bb_page);
1774 sb->feature_map |= cpu_to_le32(MD_FEATURE_BAD_BLOCKS);
1779 seq = read_seqbegin(&bb->lock);
1781 memset(bbp, 0xff, PAGE_SIZE);
1783 for (i = 0 ; i < bb->count ; i++) {
1784 u64 internal_bb = p[i];
1785 u64 store_bb = ((BB_OFFSET(internal_bb) << 10)
1786 | BB_LEN(internal_bb));
1787 bbp[i] = cpu_to_le64(store_bb);
1790 if (read_seqretry(&bb->lock, seq))
1793 bb->sector = (rdev->sb_start +
1794 (int)le32_to_cpu(sb->bblog_offset));
1795 bb->size = le16_to_cpu(sb->bblog_size);
1800 rdev_for_each(rdev2, mddev)
1801 if (rdev2->desc_nr+1 > max_dev)
1802 max_dev = rdev2->desc_nr+1;
1804 if (max_dev > le32_to_cpu(sb->max_dev)) {
1806 sb->max_dev = cpu_to_le32(max_dev);
1807 rdev->sb_size = max_dev * 2 + 256;
1808 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1809 if (rdev->sb_size & bmask)
1810 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1812 max_dev = le32_to_cpu(sb->max_dev);
1814 for (i=0; i<max_dev;i++)
1815 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_FAULTY);
1817 if (test_bit(MD_HAS_JOURNAL, &mddev->flags))
1818 sb->feature_map |= cpu_to_le32(MD_FEATURE_JOURNAL);
1820 rdev_for_each(rdev2, mddev) {
1822 if (test_bit(Faulty, &rdev2->flags))
1823 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_FAULTY);
1824 else if (test_bit(In_sync, &rdev2->flags))
1825 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1826 else if (test_bit(Journal, &rdev2->flags))
1827 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_JOURNAL);
1828 else if (rdev2->raid_disk >= 0)
1829 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1831 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_SPARE);
1834 sb->sb_csum = calc_sb_1_csum(sb);
1837 static unsigned long long
1838 super_1_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
1840 struct mdp_superblock_1 *sb;
1841 sector_t max_sectors;
1842 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1843 return 0; /* component must fit device */
1844 if (rdev->data_offset != rdev->new_data_offset)
1845 return 0; /* too confusing */
1846 if (rdev->sb_start < rdev->data_offset) {
1847 /* minor versions 1 and 2; superblock before data */
1848 max_sectors = i_size_read(rdev->bdev->bd_inode) >> 9;
1849 max_sectors -= rdev->data_offset;
1850 if (!num_sectors || num_sectors > max_sectors)
1851 num_sectors = max_sectors;
1852 } else if (rdev->mddev->bitmap_info.offset) {
1853 /* minor version 0 with bitmap we can't move */
1856 /* minor version 0; superblock after data */
1858 sb_start = (i_size_read(rdev->bdev->bd_inode) >> 9) - 8*2;
1859 sb_start &= ~(sector_t)(4*2 - 1);
1860 max_sectors = rdev->sectors + sb_start - rdev->sb_start;
1861 if (!num_sectors || num_sectors > max_sectors)
1862 num_sectors = max_sectors;
1863 rdev->sb_start = sb_start;
1865 sb = page_address(rdev->sb_page);
1866 sb->data_size = cpu_to_le64(num_sectors);
1867 sb->super_offset = rdev->sb_start;
1868 sb->sb_csum = calc_sb_1_csum(sb);
1869 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1871 md_super_wait(rdev->mddev);
1877 super_1_allow_new_offset(struct md_rdev *rdev,
1878 unsigned long long new_offset)
1880 /* All necessary checks on new >= old have been done */
1881 struct bitmap *bitmap;
1882 if (new_offset >= rdev->data_offset)
1885 /* with 1.0 metadata, there is no metadata to tread on
1886 * so we can always move back */
1887 if (rdev->mddev->minor_version == 0)
1890 /* otherwise we must be sure not to step on
1891 * any metadata, so stay:
1892 * 36K beyond start of superblock
1893 * beyond end of badblocks
1894 * beyond write-intent bitmap
1896 if (rdev->sb_start + (32+4)*2 > new_offset)
1898 bitmap = rdev->mddev->bitmap;
1899 if (bitmap && !rdev->mddev->bitmap_info.file &&
1900 rdev->sb_start + rdev->mddev->bitmap_info.offset +
1901 bitmap->storage.file_pages * (PAGE_SIZE>>9) > new_offset)
1903 if (rdev->badblocks.sector + rdev->badblocks.size > new_offset)
1909 static struct super_type super_types[] = {
1912 .owner = THIS_MODULE,
1913 .load_super = super_90_load,
1914 .validate_super = super_90_validate,
1915 .sync_super = super_90_sync,
1916 .rdev_size_change = super_90_rdev_size_change,
1917 .allow_new_offset = super_90_allow_new_offset,
1921 .owner = THIS_MODULE,
1922 .load_super = super_1_load,
1923 .validate_super = super_1_validate,
1924 .sync_super = super_1_sync,
1925 .rdev_size_change = super_1_rdev_size_change,
1926 .allow_new_offset = super_1_allow_new_offset,
1930 static void sync_super(struct mddev *mddev, struct md_rdev *rdev)
1932 if (mddev->sync_super) {
1933 mddev->sync_super(mddev, rdev);
1937 BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types));
1939 super_types[mddev->major_version].sync_super(mddev, rdev);
1942 static int match_mddev_units(struct mddev *mddev1, struct mddev *mddev2)
1944 struct md_rdev *rdev, *rdev2;
1947 rdev_for_each_rcu(rdev, mddev1) {
1948 if (test_bit(Faulty, &rdev->flags) ||
1949 test_bit(Journal, &rdev->flags) ||
1950 rdev->raid_disk == -1)
1952 rdev_for_each_rcu(rdev2, mddev2) {
1953 if (test_bit(Faulty, &rdev2->flags) ||
1954 test_bit(Journal, &rdev2->flags) ||
1955 rdev2->raid_disk == -1)
1957 if (rdev->bdev->bd_contains ==
1958 rdev2->bdev->bd_contains) {
1968 static LIST_HEAD(pending_raid_disks);
1971 * Try to register data integrity profile for an mddev
1973 * This is called when an array is started and after a disk has been kicked
1974 * from the array. It only succeeds if all working and active component devices
1975 * are integrity capable with matching profiles.
1977 int md_integrity_register(struct mddev *mddev)
1979 struct md_rdev *rdev, *reference = NULL;
1981 if (list_empty(&mddev->disks))
1982 return 0; /* nothing to do */
1983 if (!mddev->gendisk || blk_get_integrity(mddev->gendisk))
1984 return 0; /* shouldn't register, or already is */
1985 rdev_for_each(rdev, mddev) {
1986 /* skip spares and non-functional disks */
1987 if (test_bit(Faulty, &rdev->flags))
1989 if (rdev->raid_disk < 0)
1992 /* Use the first rdev as the reference */
1996 /* does this rdev's profile match the reference profile? */
1997 if (blk_integrity_compare(reference->bdev->bd_disk,
1998 rdev->bdev->bd_disk) < 0)
2001 if (!reference || !bdev_get_integrity(reference->bdev))
2004 * All component devices are integrity capable and have matching
2005 * profiles, register the common profile for the md device.
2007 blk_integrity_register(mddev->gendisk,
2008 bdev_get_integrity(reference->bdev));
2010 pr_debug("md: data integrity enabled on %s\n", mdname(mddev));
2011 if (bioset_integrity_create(mddev->bio_set, BIO_POOL_SIZE)) {
2012 pr_err("md: failed to create integrity pool for %s\n",
2018 EXPORT_SYMBOL(md_integrity_register);
2021 * Attempt to add an rdev, but only if it is consistent with the current
2024 int md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev)
2026 struct blk_integrity *bi_rdev;
2027 struct blk_integrity *bi_mddev;
2028 char name[BDEVNAME_SIZE];
2030 if (!mddev->gendisk)
2033 bi_rdev = bdev_get_integrity(rdev->bdev);
2034 bi_mddev = blk_get_integrity(mddev->gendisk);
2036 if (!bi_mddev) /* nothing to do */
2039 if (blk_integrity_compare(mddev->gendisk, rdev->bdev->bd_disk) != 0) {
2040 pr_err("%s: incompatible integrity profile for %s\n",
2041 mdname(mddev), bdevname(rdev->bdev, name));
2047 EXPORT_SYMBOL(md_integrity_add_rdev);
2049 static int bind_rdev_to_array(struct md_rdev *rdev, struct mddev *mddev)
2051 char b[BDEVNAME_SIZE];
2055 /* prevent duplicates */
2056 if (find_rdev(mddev, rdev->bdev->bd_dev))
2059 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2060 if (!test_bit(Journal, &rdev->flags) &&
2062 (mddev->dev_sectors == 0 || rdev->sectors < mddev->dev_sectors)) {
2064 /* Cannot change size, so fail
2065 * If mddev->level <= 0, then we don't care
2066 * about aligning sizes (e.g. linear)
2068 if (mddev->level > 0)
2071 mddev->dev_sectors = rdev->sectors;
2074 /* Verify rdev->desc_nr is unique.
2075 * If it is -1, assign a free number, else
2076 * check number is not in use
2079 if (rdev->desc_nr < 0) {
2082 choice = mddev->raid_disks;
2083 while (md_find_rdev_nr_rcu(mddev, choice))
2085 rdev->desc_nr = choice;
2087 if (md_find_rdev_nr_rcu(mddev, rdev->desc_nr)) {
2093 if (!test_bit(Journal, &rdev->flags) &&
2094 mddev->max_disks && rdev->desc_nr >= mddev->max_disks) {
2095 pr_warn("md: %s: array is limited to %d devices\n",
2096 mdname(mddev), mddev->max_disks);
2099 bdevname(rdev->bdev,b);
2100 strreplace(b, '/', '!');
2102 rdev->mddev = mddev;
2103 pr_debug("md: bind<%s>\n", b);
2105 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
2108 ko = &part_to_dev(rdev->bdev->bd_part)->kobj;
2109 if (sysfs_create_link(&rdev->kobj, ko, "block"))
2110 /* failure here is OK */;
2111 rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state");
2113 list_add_rcu(&rdev->same_set, &mddev->disks);
2114 bd_link_disk_holder(rdev->bdev, mddev->gendisk);
2116 /* May as well allow recovery to be retried once */
2117 mddev->recovery_disabled++;
2122 pr_warn("md: failed to register dev-%s for %s\n",
2127 static void md_delayed_delete(struct work_struct *ws)
2129 struct md_rdev *rdev = container_of(ws, struct md_rdev, del_work);
2130 kobject_del(&rdev->kobj);
2131 kobject_put(&rdev->kobj);
2134 static void unbind_rdev_from_array(struct md_rdev *rdev)
2136 char b[BDEVNAME_SIZE];
2138 bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk);
2139 list_del_rcu(&rdev->same_set);
2140 pr_debug("md: unbind<%s>\n", bdevname(rdev->bdev,b));
2142 sysfs_remove_link(&rdev->kobj, "block");
2143 sysfs_put(rdev->sysfs_state);
2144 rdev->sysfs_state = NULL;
2145 rdev->badblocks.count = 0;
2146 /* We need to delay this, otherwise we can deadlock when
2147 * writing to 'remove' to "dev/state". We also need
2148 * to delay it due to rcu usage.
2151 INIT_WORK(&rdev->del_work, md_delayed_delete);
2152 kobject_get(&rdev->kobj);
2153 queue_work(md_misc_wq, &rdev->del_work);
2157 * prevent the device from being mounted, repartitioned or
2158 * otherwise reused by a RAID array (or any other kernel
2159 * subsystem), by bd_claiming the device.
2161 static int lock_rdev(struct md_rdev *rdev, dev_t dev, int shared)
2164 struct block_device *bdev;
2165 char b[BDEVNAME_SIZE];
2167 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
2168 shared ? (struct md_rdev *)lock_rdev : rdev);
2170 pr_warn("md: could not open %s.\n", __bdevname(dev, b));
2171 return PTR_ERR(bdev);
2177 static void unlock_rdev(struct md_rdev *rdev)
2179 struct block_device *bdev = rdev->bdev;
2181 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
2184 void md_autodetect_dev(dev_t dev);
2186 static void export_rdev(struct md_rdev *rdev)
2188 char b[BDEVNAME_SIZE];
2190 pr_debug("md: export_rdev(%s)\n", bdevname(rdev->bdev,b));
2191 md_rdev_clear(rdev);
2193 if (test_bit(AutoDetected, &rdev->flags))
2194 md_autodetect_dev(rdev->bdev->bd_dev);
2197 kobject_put(&rdev->kobj);
2200 void md_kick_rdev_from_array(struct md_rdev *rdev)
2202 unbind_rdev_from_array(rdev);
2205 EXPORT_SYMBOL_GPL(md_kick_rdev_from_array);
2207 static void export_array(struct mddev *mddev)
2209 struct md_rdev *rdev;
2211 while (!list_empty(&mddev->disks)) {
2212 rdev = list_first_entry(&mddev->disks, struct md_rdev,
2214 md_kick_rdev_from_array(rdev);
2216 mddev->raid_disks = 0;
2217 mddev->major_version = 0;
2220 static void sync_sbs(struct mddev *mddev, int nospares)
2222 /* Update each superblock (in-memory image), but
2223 * if we are allowed to, skip spares which already
2224 * have the right event counter, or have one earlier
2225 * (which would mean they aren't being marked as dirty
2226 * with the rest of the array)
2228 struct md_rdev *rdev;
2229 rdev_for_each(rdev, mddev) {
2230 if (rdev->sb_events == mddev->events ||
2232 rdev->raid_disk < 0 &&
2233 rdev->sb_events+1 == mddev->events)) {
2234 /* Don't update this superblock */
2235 rdev->sb_loaded = 2;
2237 sync_super(mddev, rdev);
2238 rdev->sb_loaded = 1;
2243 static bool does_sb_need_changing(struct mddev *mddev)
2245 struct md_rdev *rdev;
2246 struct mdp_superblock_1 *sb;
2249 /* Find a good rdev */
2250 rdev_for_each(rdev, mddev)
2251 if ((rdev->raid_disk >= 0) && !test_bit(Faulty, &rdev->flags))
2254 /* No good device found. */
2258 sb = page_address(rdev->sb_page);
2259 /* Check if a device has become faulty or a spare become active */
2260 rdev_for_each(rdev, mddev) {
2261 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
2262 /* Device activated? */
2263 if (role == 0xffff && rdev->raid_disk >=0 &&
2264 !test_bit(Faulty, &rdev->flags))
2266 /* Device turned faulty? */
2267 if (test_bit(Faulty, &rdev->flags) && (role < 0xfffd))
2271 /* Check if any mddev parameters have changed */
2272 if ((mddev->dev_sectors != le64_to_cpu(sb->size)) ||
2273 (mddev->reshape_position != le64_to_cpu(sb->reshape_position)) ||
2274 (mddev->layout != le64_to_cpu(sb->layout)) ||
2275 (mddev->raid_disks != le32_to_cpu(sb->raid_disks)) ||
2276 (mddev->chunk_sectors != le32_to_cpu(sb->chunksize)))
2282 void md_update_sb(struct mddev *mddev, int force_change)
2284 struct md_rdev *rdev;
2287 int any_badblocks_changed = 0;
2292 set_bit(MD_CHANGE_DEVS, &mddev->flags);
2297 if (mddev_is_clustered(mddev)) {
2298 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
2300 if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags))
2302 ret = md_cluster_ops->metadata_update_start(mddev);
2303 /* Has someone else has updated the sb */
2304 if (!does_sb_need_changing(mddev)) {
2306 md_cluster_ops->metadata_update_cancel(mddev);
2307 bit_clear_unless(&mddev->flags, BIT(MD_CHANGE_PENDING),
2308 BIT(MD_CHANGE_DEVS) |
2309 BIT(MD_CHANGE_CLEAN));
2314 /* First make sure individual recovery_offsets are correct */
2315 rdev_for_each(rdev, mddev) {
2316 if (rdev->raid_disk >= 0 &&
2317 mddev->delta_disks >= 0 &&
2318 !test_bit(Journal, &rdev->flags) &&
2319 !test_bit(In_sync, &rdev->flags) &&
2320 mddev->curr_resync_completed > rdev->recovery_offset)
2321 rdev->recovery_offset = mddev->curr_resync_completed;
2324 if (!mddev->persistent) {
2325 clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
2326 clear_bit(MD_CHANGE_DEVS, &mddev->flags);
2327 if (!mddev->external) {
2328 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2329 rdev_for_each(rdev, mddev) {
2330 if (rdev->badblocks.changed) {
2331 rdev->badblocks.changed = 0;
2332 ack_all_badblocks(&rdev->badblocks);
2333 md_error(mddev, rdev);
2335 clear_bit(Blocked, &rdev->flags);
2336 clear_bit(BlockedBadBlocks, &rdev->flags);
2337 wake_up(&rdev->blocked_wait);
2340 wake_up(&mddev->sb_wait);
2344 spin_lock(&mddev->lock);
2346 mddev->utime = ktime_get_real_seconds();
2348 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
2350 if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags))
2351 /* just a clean<-> dirty transition, possibly leave spares alone,
2352 * though if events isn't the right even/odd, we will have to do
2358 if (mddev->degraded)
2359 /* If the array is degraded, then skipping spares is both
2360 * dangerous and fairly pointless.
2361 * Dangerous because a device that was removed from the array
2362 * might have a event_count that still looks up-to-date,
2363 * so it can be re-added without a resync.
2364 * Pointless because if there are any spares to skip,
2365 * then a recovery will happen and soon that array won't
2366 * be degraded any more and the spare can go back to sleep then.
2370 sync_req = mddev->in_sync;
2372 /* If this is just a dirty<->clean transition, and the array is clean
2373 * and 'events' is odd, we can roll back to the previous clean state */
2375 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
2376 && mddev->can_decrease_events
2377 && mddev->events != 1) {
2379 mddev->can_decrease_events = 0;
2381 /* otherwise we have to go forward and ... */
2383 mddev->can_decrease_events = nospares;
2387 * This 64-bit counter should never wrap.
2388 * Either we are in around ~1 trillion A.C., assuming
2389 * 1 reboot per second, or we have a bug...
2391 WARN_ON(mddev->events == 0);
2393 rdev_for_each(rdev, mddev) {
2394 if (rdev->badblocks.changed)
2395 any_badblocks_changed++;
2396 if (test_bit(Faulty, &rdev->flags))
2397 set_bit(FaultRecorded, &rdev->flags);
2400 sync_sbs(mddev, nospares);
2401 spin_unlock(&mddev->lock);
2403 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2404 mdname(mddev), mddev->in_sync);
2406 bitmap_update_sb(mddev->bitmap);
2407 rdev_for_each(rdev, mddev) {
2408 char b[BDEVNAME_SIZE];
2410 if (rdev->sb_loaded != 1)
2411 continue; /* no noise on spare devices */
2413 if (!test_bit(Faulty, &rdev->flags)) {
2414 md_super_write(mddev,rdev,
2415 rdev->sb_start, rdev->sb_size,
2417 pr_debug("md: (write) %s's sb offset: %llu\n",
2418 bdevname(rdev->bdev, b),
2419 (unsigned long long)rdev->sb_start);
2420 rdev->sb_events = mddev->events;
2421 if (rdev->badblocks.size) {
2422 md_super_write(mddev, rdev,
2423 rdev->badblocks.sector,
2424 rdev->badblocks.size << 9,
2426 rdev->badblocks.size = 0;
2430 pr_debug("md: %s (skipping faulty)\n",
2431 bdevname(rdev->bdev, b));
2433 if (mddev->level == LEVEL_MULTIPATH)
2434 /* only need to write one superblock... */
2437 md_super_wait(mddev);
2438 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2440 if (mddev_is_clustered(mddev) && ret == 0)
2441 md_cluster_ops->metadata_update_finish(mddev);
2443 if (mddev->in_sync != sync_req ||
2444 !bit_clear_unless(&mddev->flags, BIT(MD_CHANGE_PENDING),
2445 BIT(MD_CHANGE_DEVS) | BIT(MD_CHANGE_CLEAN)))
2446 /* have to write it out again */
2448 wake_up(&mddev->sb_wait);
2449 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
2450 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
2452 rdev_for_each(rdev, mddev) {
2453 if (test_and_clear_bit(FaultRecorded, &rdev->flags))
2454 clear_bit(Blocked, &rdev->flags);
2456 if (any_badblocks_changed)
2457 ack_all_badblocks(&rdev->badblocks);
2458 clear_bit(BlockedBadBlocks, &rdev->flags);
2459 wake_up(&rdev->blocked_wait);
2462 EXPORT_SYMBOL(md_update_sb);
2464 static int add_bound_rdev(struct md_rdev *rdev)
2466 struct mddev *mddev = rdev->mddev;
2468 bool add_journal = test_bit(Journal, &rdev->flags);
2470 if (!mddev->pers->hot_remove_disk || add_journal) {
2471 /* If there is hot_add_disk but no hot_remove_disk
2472 * then added disks for geometry changes,
2473 * and should be added immediately.
2475 super_types[mddev->major_version].
2476 validate_super(mddev, rdev);
2478 mddev_suspend(mddev);
2479 err = mddev->pers->hot_add_disk(mddev, rdev);
2481 mddev_resume(mddev);
2483 md_kick_rdev_from_array(rdev);
2487 sysfs_notify_dirent_safe(rdev->sysfs_state);
2489 set_bit(MD_CHANGE_DEVS, &mddev->flags);
2490 if (mddev->degraded)
2491 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
2492 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2493 md_new_event(mddev);
2494 md_wakeup_thread(mddev->thread);
2498 /* words written to sysfs files may, or may not, be \n terminated.
2499 * We want to accept with case. For this we use cmd_match.
2501 static int cmd_match(const char *cmd, const char *str)
2503 /* See if cmd, written into a sysfs file, matches
2504 * str. They must either be the same, or cmd can
2505 * have a trailing newline
2507 while (*cmd && *str && *cmd == *str) {
2518 struct rdev_sysfs_entry {
2519 struct attribute attr;
2520 ssize_t (*show)(struct md_rdev *, char *);
2521 ssize_t (*store)(struct md_rdev *, const char *, size_t);
2525 state_show(struct md_rdev *rdev, char *page)
2529 unsigned long flags = ACCESS_ONCE(rdev->flags);
2531 if (test_bit(Faulty, &flags) ||
2532 (!test_bit(ExternalBbl, &flags) &&
2533 rdev->badblocks.unacked_exist))
2534 len += sprintf(page+len, "faulty%s", sep);
2535 if (test_bit(In_sync, &flags))
2536 len += sprintf(page+len, "in_sync%s", sep);
2537 if (test_bit(Journal, &flags))
2538 len += sprintf(page+len, "journal%s", sep);
2539 if (test_bit(WriteMostly, &flags))
2540 len += sprintf(page+len, "write_mostly%s", sep);
2541 if (test_bit(Blocked, &flags) ||
2542 (rdev->badblocks.unacked_exist
2543 && !test_bit(Faulty, &flags)))
2544 len += sprintf(page+len, "blocked%s", sep);
2545 if (!test_bit(Faulty, &flags) &&
2546 !test_bit(Journal, &flags) &&
2547 !test_bit(In_sync, &flags))
2548 len += sprintf(page+len, "spare%s", sep);
2549 if (test_bit(WriteErrorSeen, &flags))
2550 len += sprintf(page+len, "write_error%s", sep);
2551 if (test_bit(WantReplacement, &flags))
2552 len += sprintf(page+len, "want_replacement%s", sep);
2553 if (test_bit(Replacement, &flags))
2554 len += sprintf(page+len, "replacement%s", sep);
2555 if (test_bit(ExternalBbl, &flags))
2556 len += sprintf(page+len, "external_bbl%s", sep);
2561 return len+sprintf(page+len, "\n");
2565 state_store(struct md_rdev *rdev, const char *buf, size_t len)
2568 * faulty - simulates an error
2569 * remove - disconnects the device
2570 * writemostly - sets write_mostly
2571 * -writemostly - clears write_mostly
2572 * blocked - sets the Blocked flags
2573 * -blocked - clears the Blocked and possibly simulates an error
2574 * insync - sets Insync providing device isn't active
2575 * -insync - clear Insync for a device with a slot assigned,
2576 * so that it gets rebuilt based on bitmap
2577 * write_error - sets WriteErrorSeen
2578 * -write_error - clears WriteErrorSeen
2581 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
2582 md_error(rdev->mddev, rdev);
2583 if (test_bit(Faulty, &rdev->flags))
2587 } else if (cmd_match(buf, "remove")) {
2588 if (rdev->mddev->pers) {
2589 clear_bit(Blocked, &rdev->flags);
2590 remove_and_add_spares(rdev->mddev, rdev);
2592 if (rdev->raid_disk >= 0)
2595 struct mddev *mddev = rdev->mddev;
2597 if (mddev_is_clustered(mddev))
2598 err = md_cluster_ops->remove_disk(mddev, rdev);
2601 md_kick_rdev_from_array(rdev);
2603 md_update_sb(mddev, 1);
2604 md_new_event(mddev);
2607 } else if (cmd_match(buf, "writemostly")) {
2608 set_bit(WriteMostly, &rdev->flags);
2610 } else if (cmd_match(buf, "-writemostly")) {
2611 clear_bit(WriteMostly, &rdev->flags);
2613 } else if (cmd_match(buf, "blocked")) {
2614 set_bit(Blocked, &rdev->flags);
2616 } else if (cmd_match(buf, "-blocked")) {
2617 if (!test_bit(Faulty, &rdev->flags) &&
2618 !test_bit(ExternalBbl, &rdev->flags) &&
2619 rdev->badblocks.unacked_exist) {
2620 /* metadata handler doesn't understand badblocks,
2621 * so we need to fail the device
2623 md_error(rdev->mddev, rdev);
2625 clear_bit(Blocked, &rdev->flags);
2626 clear_bit(BlockedBadBlocks, &rdev->flags);
2627 wake_up(&rdev->blocked_wait);
2628 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2629 md_wakeup_thread(rdev->mddev->thread);
2632 } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) {
2633 set_bit(In_sync, &rdev->flags);
2635 } else if (cmd_match(buf, "-insync") && rdev->raid_disk >= 0 &&
2636 !test_bit(Journal, &rdev->flags)) {
2637 if (rdev->mddev->pers == NULL) {
2638 clear_bit(In_sync, &rdev->flags);
2639 rdev->saved_raid_disk = rdev->raid_disk;
2640 rdev->raid_disk = -1;
2643 } else if (cmd_match(buf, "write_error")) {
2644 set_bit(WriteErrorSeen, &rdev->flags);
2646 } else if (cmd_match(buf, "-write_error")) {
2647 clear_bit(WriteErrorSeen, &rdev->flags);
2649 } else if (cmd_match(buf, "want_replacement")) {
2650 /* Any non-spare device that is not a replacement can
2651 * become want_replacement at any time, but we then need to
2652 * check if recovery is needed.
2654 if (rdev->raid_disk >= 0 &&
2655 !test_bit(Journal, &rdev->flags) &&
2656 !test_bit(Replacement, &rdev->flags))
2657 set_bit(WantReplacement, &rdev->flags);
2658 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2659 md_wakeup_thread(rdev->mddev->thread);
2661 } else if (cmd_match(buf, "-want_replacement")) {
2662 /* Clearing 'want_replacement' is always allowed.
2663 * Once replacements starts it is too late though.
2666 clear_bit(WantReplacement, &rdev->flags);
2667 } else if (cmd_match(buf, "replacement")) {
2668 /* Can only set a device as a replacement when array has not
2669 * yet been started. Once running, replacement is automatic
2670 * from spares, or by assigning 'slot'.
2672 if (rdev->mddev->pers)
2675 set_bit(Replacement, &rdev->flags);
2678 } else if (cmd_match(buf, "-replacement")) {
2679 /* Similarly, can only clear Replacement before start */
2680 if (rdev->mddev->pers)
2683 clear_bit(Replacement, &rdev->flags);
2686 } else if (cmd_match(buf, "re-add")) {
2687 if (test_bit(Faulty, &rdev->flags) && (rdev->raid_disk == -1)) {
2688 /* clear_bit is performed _after_ all the devices
2689 * have their local Faulty bit cleared. If any writes
2690 * happen in the meantime in the local node, they
2691 * will land in the local bitmap, which will be synced
2692 * by this node eventually
2694 if (!mddev_is_clustered(rdev->mddev) ||
2695 (err = md_cluster_ops->gather_bitmaps(rdev)) == 0) {
2696 clear_bit(Faulty, &rdev->flags);
2697 err = add_bound_rdev(rdev);
2701 } else if (cmd_match(buf, "external_bbl") && (rdev->mddev->external)) {
2702 set_bit(ExternalBbl, &rdev->flags);
2703 rdev->badblocks.shift = 0;
2705 } else if (cmd_match(buf, "-external_bbl") && (rdev->mddev->external)) {
2706 clear_bit(ExternalBbl, &rdev->flags);
2710 sysfs_notify_dirent_safe(rdev->sysfs_state);
2711 return err ? err : len;
2713 static struct rdev_sysfs_entry rdev_state =
2714 __ATTR_PREALLOC(state, S_IRUGO|S_IWUSR, state_show, state_store);
2717 errors_show(struct md_rdev *rdev, char *page)
2719 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
2723 errors_store(struct md_rdev *rdev, const char *buf, size_t len)
2728 rv = kstrtouint(buf, 10, &n);
2731 atomic_set(&rdev->corrected_errors, n);
2734 static struct rdev_sysfs_entry rdev_errors =
2735 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
2738 slot_show(struct md_rdev *rdev, char *page)
2740 if (test_bit(Journal, &rdev->flags))
2741 return sprintf(page, "journal\n");
2742 else if (rdev->raid_disk < 0)
2743 return sprintf(page, "none\n");
2745 return sprintf(page, "%d\n", rdev->raid_disk);
2749 slot_store(struct md_rdev *rdev, const char *buf, size_t len)
2754 if (test_bit(Journal, &rdev->flags))
2756 if (strncmp(buf, "none", 4)==0)
2759 err = kstrtouint(buf, 10, (unsigned int *)&slot);
2763 if (rdev->mddev->pers && slot == -1) {
2764 /* Setting 'slot' on an active array requires also
2765 * updating the 'rd%d' link, and communicating
2766 * with the personality with ->hot_*_disk.
2767 * For now we only support removing
2768 * failed/spare devices. This normally happens automatically,
2769 * but not when the metadata is externally managed.
2771 if (rdev->raid_disk == -1)
2773 /* personality does all needed checks */
2774 if (rdev->mddev->pers->hot_remove_disk == NULL)
2776 clear_bit(Blocked, &rdev->flags);
2777 remove_and_add_spares(rdev->mddev, rdev);
2778 if (rdev->raid_disk >= 0)
2780 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2781 md_wakeup_thread(rdev->mddev->thread);
2782 } else if (rdev->mddev->pers) {
2783 /* Activating a spare .. or possibly reactivating
2784 * if we ever get bitmaps working here.
2788 if (rdev->raid_disk != -1)
2791 if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery))
2794 if (rdev->mddev->pers->hot_add_disk == NULL)
2797 if (slot >= rdev->mddev->raid_disks &&
2798 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
2801 rdev->raid_disk = slot;
2802 if (test_bit(In_sync, &rdev->flags))
2803 rdev->saved_raid_disk = slot;
2805 rdev->saved_raid_disk = -1;
2806 clear_bit(In_sync, &rdev->flags);
2807 clear_bit(Bitmap_sync, &rdev->flags);
2808 err = rdev->mddev->pers->
2809 hot_add_disk(rdev->mddev, rdev);
2811 rdev->raid_disk = -1;
2814 sysfs_notify_dirent_safe(rdev->sysfs_state);
2815 if (sysfs_link_rdev(rdev->mddev, rdev))
2816 /* failure here is OK */;
2817 /* don't wakeup anyone, leave that to userspace. */
2819 if (slot >= rdev->mddev->raid_disks &&
2820 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
2822 rdev->raid_disk = slot;
2823 /* assume it is working */
2824 clear_bit(Faulty, &rdev->flags);
2825 clear_bit(WriteMostly, &rdev->flags);
2826 set_bit(In_sync, &rdev->flags);
2827 sysfs_notify_dirent_safe(rdev->sysfs_state);
2832 static struct rdev_sysfs_entry rdev_slot =
2833 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
2836 offset_show(struct md_rdev *rdev, char *page)
2838 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
2842 offset_store(struct md_rdev *rdev, const char *buf, size_t len)
2844 unsigned long long offset;
2845 if (kstrtoull(buf, 10, &offset) < 0)
2847 if (rdev->mddev->pers && rdev->raid_disk >= 0)
2849 if (rdev->sectors && rdev->mddev->external)
2850 /* Must set offset before size, so overlap checks
2853 rdev->data_offset = offset;
2854 rdev->new_data_offset = offset;
2858 static struct rdev_sysfs_entry rdev_offset =
2859 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
2861 static ssize_t new_offset_show(struct md_rdev *rdev, char *page)
2863 return sprintf(page, "%llu\n",
2864 (unsigned long long)rdev->new_data_offset);
2867 static ssize_t new_offset_store(struct md_rdev *rdev,
2868 const char *buf, size_t len)
2870 unsigned long long new_offset;
2871 struct mddev *mddev = rdev->mddev;
2873 if (kstrtoull(buf, 10, &new_offset) < 0)
2876 if (mddev->sync_thread ||
2877 test_bit(MD_RECOVERY_RUNNING,&mddev->recovery))
2879 if (new_offset == rdev->data_offset)
2880 /* reset is always permitted */
2882 else if (new_offset > rdev->data_offset) {
2883 /* must not push array size beyond rdev_sectors */
2884 if (new_offset - rdev->data_offset
2885 + mddev->dev_sectors > rdev->sectors)
2888 /* Metadata worries about other space details. */
2890 /* decreasing the offset is inconsistent with a backwards
2893 if (new_offset < rdev->data_offset &&
2894 mddev->reshape_backwards)
2896 /* Increasing offset is inconsistent with forwards
2897 * reshape. reshape_direction should be set to
2898 * 'backwards' first.
2900 if (new_offset > rdev->data_offset &&
2901 !mddev->reshape_backwards)
2904 if (mddev->pers && mddev->persistent &&
2905 !super_types[mddev->major_version]
2906 .allow_new_offset(rdev, new_offset))
2908 rdev->new_data_offset = new_offset;
2909 if (new_offset > rdev->data_offset)
2910 mddev->reshape_backwards = 1;
2911 else if (new_offset < rdev->data_offset)
2912 mddev->reshape_backwards = 0;
2916 static struct rdev_sysfs_entry rdev_new_offset =
2917 __ATTR(new_offset, S_IRUGO|S_IWUSR, new_offset_show, new_offset_store);
2920 rdev_size_show(struct md_rdev *rdev, char *page)
2922 return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2);
2925 static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
2927 /* check if two start/length pairs overlap */
2935 static int strict_blocks_to_sectors(const char *buf, sector_t *sectors)
2937 unsigned long long blocks;
2940 if (kstrtoull(buf, 10, &blocks) < 0)
2943 if (blocks & 1ULL << (8 * sizeof(blocks) - 1))
2944 return -EINVAL; /* sector conversion overflow */
2947 if (new != blocks * 2)
2948 return -EINVAL; /* unsigned long long to sector_t overflow */
2955 rdev_size_store(struct md_rdev *rdev, const char *buf, size_t len)
2957 struct mddev *my_mddev = rdev->mddev;
2958 sector_t oldsectors = rdev->sectors;
2961 if (test_bit(Journal, &rdev->flags))
2963 if (strict_blocks_to_sectors(buf, §ors) < 0)
2965 if (rdev->data_offset != rdev->new_data_offset)
2966 return -EINVAL; /* too confusing */
2967 if (my_mddev->pers && rdev->raid_disk >= 0) {
2968 if (my_mddev->persistent) {
2969 sectors = super_types[my_mddev->major_version].
2970 rdev_size_change(rdev, sectors);
2973 } else if (!sectors)
2974 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) -
2976 if (!my_mddev->pers->resize)
2977 /* Cannot change size for RAID0 or Linear etc */
2980 if (sectors < my_mddev->dev_sectors)
2981 return -EINVAL; /* component must fit device */
2983 rdev->sectors = sectors;
2984 if (sectors > oldsectors && my_mddev->external) {
2985 /* Need to check that all other rdevs with the same
2986 * ->bdev do not overlap. 'rcu' is sufficient to walk
2987 * the rdev lists safely.
2988 * This check does not provide a hard guarantee, it
2989 * just helps avoid dangerous mistakes.
2991 struct mddev *mddev;
2993 struct list_head *tmp;
2996 for_each_mddev(mddev, tmp) {
2997 struct md_rdev *rdev2;
2999 rdev_for_each(rdev2, mddev)
3000 if (rdev->bdev == rdev2->bdev &&
3002 overlaps(rdev->data_offset, rdev->sectors,
3015 /* Someone else could have slipped in a size
3016 * change here, but doing so is just silly.
3017 * We put oldsectors back because we *know* it is
3018 * safe, and trust userspace not to race with
3021 rdev->sectors = oldsectors;
3028 static struct rdev_sysfs_entry rdev_size =
3029 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
3031 static ssize_t recovery_start_show(struct md_rdev *rdev, char *page)
3033 unsigned long long recovery_start = rdev->recovery_offset;
3035 if (test_bit(In_sync, &rdev->flags) ||
3036 recovery_start == MaxSector)
3037 return sprintf(page, "none\n");
3039 return sprintf(page, "%llu\n", recovery_start);
3042 static ssize_t recovery_start_store(struct md_rdev *rdev, const char *buf, size_t len)
3044 unsigned long long recovery_start;
3046 if (cmd_match(buf, "none"))
3047 recovery_start = MaxSector;
3048 else if (kstrtoull(buf, 10, &recovery_start))
3051 if (rdev->mddev->pers &&
3052 rdev->raid_disk >= 0)
3055 rdev->recovery_offset = recovery_start;
3056 if (recovery_start == MaxSector)
3057 set_bit(In_sync, &rdev->flags);
3059 clear_bit(In_sync, &rdev->flags);
3063 static struct rdev_sysfs_entry rdev_recovery_start =
3064 __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store);
3066 /* sysfs access to bad-blocks list.
3067 * We present two files.
3068 * 'bad-blocks' lists sector numbers and lengths of ranges that
3069 * are recorded as bad. The list is truncated to fit within
3070 * the one-page limit of sysfs.
3071 * Writing "sector length" to this file adds an acknowledged
3073 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
3074 * been acknowledged. Writing to this file adds bad blocks
3075 * without acknowledging them. This is largely for testing.
3077 static ssize_t bb_show(struct md_rdev *rdev, char *page)
3079 return badblocks_show(&rdev->badblocks, page, 0);
3081 static ssize_t bb_store(struct md_rdev *rdev, const char *page, size_t len)
3083 int rv = badblocks_store(&rdev->badblocks, page, len, 0);
3084 /* Maybe that ack was all we needed */
3085 if (test_and_clear_bit(BlockedBadBlocks, &rdev->flags))
3086 wake_up(&rdev->blocked_wait);
3089 static struct rdev_sysfs_entry rdev_bad_blocks =
3090 __ATTR(bad_blocks, S_IRUGO|S_IWUSR, bb_show, bb_store);
3092 static ssize_t ubb_show(struct md_rdev *rdev, char *page)
3094 return badblocks_show(&rdev->badblocks, page, 1);
3096 static ssize_t ubb_store(struct md_rdev *rdev, const char *page, size_t len)
3098 return badblocks_store(&rdev->badblocks, page, len, 1);
3100 static struct rdev_sysfs_entry rdev_unack_bad_blocks =
3101 __ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store);
3103 static struct attribute *rdev_default_attrs[] = {
3108 &rdev_new_offset.attr,
3110 &rdev_recovery_start.attr,
3111 &rdev_bad_blocks.attr,
3112 &rdev_unack_bad_blocks.attr,
3116 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
3118 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3119 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3125 return entry->show(rdev, page);
3129 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
3130 const char *page, size_t length)
3132 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3133 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3135 struct mddev *mddev = rdev->mddev;
3139 if (!capable(CAP_SYS_ADMIN))
3141 rv = mddev ? mddev_lock(mddev): -EBUSY;
3143 if (rdev->mddev == NULL)
3146 rv = entry->store(rdev, page, length);
3147 mddev_unlock(mddev);
3152 static void rdev_free(struct kobject *ko)
3154 struct md_rdev *rdev = container_of(ko, struct md_rdev, kobj);
3157 static const struct sysfs_ops rdev_sysfs_ops = {
3158 .show = rdev_attr_show,
3159 .store = rdev_attr_store,
3161 static struct kobj_type rdev_ktype = {
3162 .release = rdev_free,
3163 .sysfs_ops = &rdev_sysfs_ops,
3164 .default_attrs = rdev_default_attrs,
3167 int md_rdev_init(struct md_rdev *rdev)
3170 rdev->saved_raid_disk = -1;
3171 rdev->raid_disk = -1;
3173 rdev->data_offset = 0;
3174 rdev->new_data_offset = 0;
3175 rdev->sb_events = 0;
3176 rdev->last_read_error = 0;
3177 rdev->sb_loaded = 0;
3178 rdev->bb_page = NULL;
3179 atomic_set(&rdev->nr_pending, 0);
3180 atomic_set(&rdev->read_errors, 0);
3181 atomic_set(&rdev->corrected_errors, 0);
3183 INIT_LIST_HEAD(&rdev->same_set);
3184 init_waitqueue_head(&rdev->blocked_wait);
3186 /* Add space to store bad block list.
3187 * This reserves the space even on arrays where it cannot
3188 * be used - I wonder if that matters
3190 return badblocks_init(&rdev->badblocks, 0);
3192 EXPORT_SYMBOL_GPL(md_rdev_init);
3194 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3196 * mark the device faulty if:
3198 * - the device is nonexistent (zero size)
3199 * - the device has no valid superblock
3201 * a faulty rdev _never_ has rdev->sb set.
3203 static struct md_rdev *md_import_device(dev_t newdev, int super_format, int super_minor)
3205 char b[BDEVNAME_SIZE];
3207 struct md_rdev *rdev;
3210 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
3212 return ERR_PTR(-ENOMEM);
3214 err = md_rdev_init(rdev);
3217 err = alloc_disk_sb(rdev);
3221 err = lock_rdev(rdev, newdev, super_format == -2);
3225 kobject_init(&rdev->kobj, &rdev_ktype);
3227 size = i_size_read(rdev->bdev->bd_inode) >> BLOCK_SIZE_BITS;
3229 pr_warn("md: %s has zero or unknown size, marking faulty!\n",
3230 bdevname(rdev->bdev,b));
3235 if (super_format >= 0) {
3236 err = super_types[super_format].
3237 load_super(rdev, NULL, super_minor);
3238 if (err == -EINVAL) {
3239 pr_warn("md: %s does not have a valid v%d.%d superblock, not importing!\n",
3240 bdevname(rdev->bdev,b),
3241 super_format, super_minor);
3245 pr_warn("md: could not read %s's sb, not importing!\n",
3246 bdevname(rdev->bdev,b));
3256 md_rdev_clear(rdev);
3258 return ERR_PTR(err);
3262 * Check a full RAID array for plausibility
3265 static void analyze_sbs(struct mddev *mddev)
3268 struct md_rdev *rdev, *freshest, *tmp;
3269 char b[BDEVNAME_SIZE];
3272 rdev_for_each_safe(rdev, tmp, mddev)
3273 switch (super_types[mddev->major_version].
3274 load_super(rdev, freshest, mddev->minor_version)) {
3281 pr_warn("md: fatal superblock inconsistency in %s -- removing from array\n",
3282 bdevname(rdev->bdev,b));
3283 md_kick_rdev_from_array(rdev);
3286 super_types[mddev->major_version].
3287 validate_super(mddev, freshest);
3290 rdev_for_each_safe(rdev, tmp, mddev) {
3291 if (mddev->max_disks &&
3292 (rdev->desc_nr >= mddev->max_disks ||
3293 i > mddev->max_disks)) {
3294 pr_warn("md: %s: %s: only %d devices permitted\n",
3295 mdname(mddev), bdevname(rdev->bdev, b),
3297 md_kick_rdev_from_array(rdev);
3300 if (rdev != freshest) {
3301 if (super_types[mddev->major_version].
3302 validate_super(mddev, rdev)) {
3303 pr_warn("md: kicking non-fresh %s from array!\n",
3304 bdevname(rdev->bdev,b));
3305 md_kick_rdev_from_array(rdev);
3309 if (mddev->level == LEVEL_MULTIPATH) {
3310 rdev->desc_nr = i++;
3311 rdev->raid_disk = rdev->desc_nr;
3312 set_bit(In_sync, &rdev->flags);
3313 } else if (rdev->raid_disk >=
3314 (mddev->raid_disks - min(0, mddev->delta_disks)) &&
3315 !test_bit(Journal, &rdev->flags)) {
3316 rdev->raid_disk = -1;
3317 clear_bit(In_sync, &rdev->flags);
3322 /* Read a fixed-point number.
3323 * Numbers in sysfs attributes should be in "standard" units where
3324 * possible, so time should be in seconds.
3325 * However we internally use a a much smaller unit such as
3326 * milliseconds or jiffies.
3327 * This function takes a decimal number with a possible fractional
3328 * component, and produces an integer which is the result of
3329 * multiplying that number by 10^'scale'.
3330 * all without any floating-point arithmetic.
3332 int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale)
3334 unsigned long result = 0;
3336 while (isdigit(*cp) || (*cp == '.' && decimals < 0)) {
3339 else if (decimals < scale) {
3342 result = result * 10 + value;
3354 while (decimals < scale) {
3363 safe_delay_show(struct mddev *mddev, char *page)
3365 int msec = (mddev->safemode_delay*1000)/HZ;
3366 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
3369 safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len)
3373 if (mddev_is_clustered(mddev)) {
3374 pr_warn("md: Safemode is disabled for clustered mode\n");
3378 if (strict_strtoul_scaled(cbuf, &msec, 3) < 0)
3381 mddev->safemode_delay = 0;
3383 unsigned long old_delay = mddev->safemode_delay;
3384 unsigned long new_delay = (msec*HZ)/1000;
3388 mddev->safemode_delay = new_delay;
3389 if (new_delay < old_delay || old_delay == 0)
3390 mod_timer(&mddev->safemode_timer, jiffies+1);
3394 static struct md_sysfs_entry md_safe_delay =
3395 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
3398 level_show(struct mddev *mddev, char *page)
3400 struct md_personality *p;
3402 spin_lock(&mddev->lock);
3405 ret = sprintf(page, "%s\n", p->name);
3406 else if (mddev->clevel[0])
3407 ret = sprintf(page, "%s\n", mddev->clevel);
3408 else if (mddev->level != LEVEL_NONE)
3409 ret = sprintf(page, "%d\n", mddev->level);
3412 spin_unlock(&mddev->lock);
3417 level_store(struct mddev *mddev, const char *buf, size_t len)
3422 struct md_personality *pers, *oldpers;
3424 void *priv, *oldpriv;
3425 struct md_rdev *rdev;
3427 if (slen == 0 || slen >= sizeof(clevel))
3430 rv = mddev_lock(mddev);
3434 if (mddev->pers == NULL) {
3435 strncpy(mddev->clevel, buf, slen);
3436 if (mddev->clevel[slen-1] == '\n')
3438 mddev->clevel[slen] = 0;
3439 mddev->level = LEVEL_NONE;
3447 /* request to change the personality. Need to ensure:
3448 * - array is not engaged in resync/recovery/reshape
3449 * - old personality can be suspended
3450 * - new personality will access other array.
3454 if (mddev->sync_thread ||
3455 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3456 mddev->reshape_position != MaxSector ||
3457 mddev->sysfs_active)
3461 if (!mddev->pers->quiesce) {
3462 pr_warn("md: %s: %s does not support online personality change\n",
3463 mdname(mddev), mddev->pers->name);
3467 /* Now find the new personality */
3468 strncpy(clevel, buf, slen);
3469 if (clevel[slen-1] == '\n')
3472 if (kstrtol(clevel, 10, &level))
3475 if (request_module("md-%s", clevel) != 0)
3476 request_module("md-level-%s", clevel);
3477 spin_lock(&pers_lock);
3478 pers = find_pers(level, clevel);
3479 if (!pers || !try_module_get(pers->owner)) {
3480 spin_unlock(&pers_lock);
3481 pr_warn("md: personality %s not loaded\n", clevel);
3485 spin_unlock(&pers_lock);
3487 if (pers == mddev->pers) {
3488 /* Nothing to do! */
3489 module_put(pers->owner);
3493 if (!pers->takeover) {
3494 module_put(pers->owner);
3495 pr_warn("md: %s: %s does not support personality takeover\n",
3496 mdname(mddev), clevel);
3501 rdev_for_each(rdev, mddev)
3502 rdev->new_raid_disk = rdev->raid_disk;
3504 /* ->takeover must set new_* and/or delta_disks
3505 * if it succeeds, and may set them when it fails.
3507 priv = pers->takeover(mddev);
3509 mddev->new_level = mddev->level;
3510 mddev->new_layout = mddev->layout;
3511 mddev->new_chunk_sectors = mddev->chunk_sectors;
3512 mddev->raid_disks -= mddev->delta_disks;
3513 mddev->delta_disks = 0;
3514 mddev->reshape_backwards = 0;
3515 module_put(pers->owner);
3516 pr_warn("md: %s: %s would not accept array\n",
3517 mdname(mddev), clevel);
3522 /* Looks like we have a winner */
3523 mddev_suspend(mddev);
3524 mddev_detach(mddev);
3526 spin_lock(&mddev->lock);
3527 oldpers = mddev->pers;
3528 oldpriv = mddev->private;
3530 mddev->private = priv;
3531 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
3532 mddev->level = mddev->new_level;
3533 mddev->layout = mddev->new_layout;
3534 mddev->chunk_sectors = mddev->new_chunk_sectors;
3535 mddev->delta_disks = 0;
3536 mddev->reshape_backwards = 0;
3537 mddev->degraded = 0;
3538 spin_unlock(&mddev->lock);
3540 if (oldpers->sync_request == NULL &&
3542 /* We are converting from a no-redundancy array
3543 * to a redundancy array and metadata is managed
3544 * externally so we need to be sure that writes
3545 * won't block due to a need to transition
3547 * until external management is started.
3550 mddev->safemode_delay = 0;
3551 mddev->safemode = 0;
3554 oldpers->free(mddev, oldpriv);
3556 if (oldpers->sync_request == NULL &&
3557 pers->sync_request != NULL) {
3558 /* need to add the md_redundancy_group */
3559 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
3560 pr_warn("md: cannot register extra attributes for %s\n",
3562 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action");
3564 if (oldpers->sync_request != NULL &&
3565 pers->sync_request == NULL) {
3566 /* need to remove the md_redundancy_group */
3567 if (mddev->to_remove == NULL)
3568 mddev->to_remove = &md_redundancy_group;
3571 module_put(oldpers->owner);
3573 rdev_for_each(rdev, mddev) {
3574 if (rdev->raid_disk < 0)
3576 if (rdev->new_raid_disk >= mddev->raid_disks)
3577 rdev->new_raid_disk = -1;
3578 if (rdev->new_raid_disk == rdev->raid_disk)
3580 sysfs_unlink_rdev(mddev, rdev);
3582 rdev_for_each(rdev, mddev) {
3583 if (rdev->raid_disk < 0)
3585 if (rdev->new_raid_disk == rdev->raid_disk)
3587 rdev->raid_disk = rdev->new_raid_disk;
3588 if (rdev->raid_disk < 0)
3589 clear_bit(In_sync, &rdev->flags);
3591 if (sysfs_link_rdev(mddev, rdev))
3592 pr_warn("md: cannot register rd%d for %s after level change\n",
3593 rdev->raid_disk, mdname(mddev));
3597 if (pers->sync_request == NULL) {
3598 /* this is now an array without redundancy, so
3599 * it must always be in_sync
3602 del_timer_sync(&mddev->safemode_timer);
3604 blk_set_stacking_limits(&mddev->queue->limits);
3606 set_bit(MD_CHANGE_DEVS, &mddev->flags);
3607 mddev_resume(mddev);
3609 md_update_sb(mddev, 1);
3610 sysfs_notify(&mddev->kobj, NULL, "level");
3611 md_new_event(mddev);
3614 mddev_unlock(mddev);
3618 static struct md_sysfs_entry md_level =
3619 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
3622 layout_show(struct mddev *mddev, char *page)
3624 /* just a number, not meaningful for all levels */
3625 if (mddev->reshape_position != MaxSector &&
3626 mddev->layout != mddev->new_layout)
3627 return sprintf(page, "%d (%d)\n",
3628 mddev->new_layout, mddev->layout);
3629 return sprintf(page, "%d\n", mddev->layout);
3633 layout_store(struct mddev *mddev, const char *buf, size_t len)
3638 err = kstrtouint(buf, 10, &n);
3641 err = mddev_lock(mddev);
3646 if (mddev->pers->check_reshape == NULL)
3651 mddev->new_layout = n;
3652 err = mddev->pers->check_reshape(mddev);
3654 mddev->new_layout = mddev->layout;
3657 mddev->new_layout = n;
3658 if (mddev->reshape_position == MaxSector)
3661 mddev_unlock(mddev);
3664 static struct md_sysfs_entry md_layout =
3665 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
3668 raid_disks_show(struct mddev *mddev, char *page)
3670 if (mddev->raid_disks == 0)
3672 if (mddev->reshape_position != MaxSector &&
3673 mddev->delta_disks != 0)
3674 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
3675 mddev->raid_disks - mddev->delta_disks);
3676 return sprintf(page, "%d\n", mddev->raid_disks);
3679 static int update_raid_disks(struct mddev *mddev, int raid_disks);
3682 raid_disks_store(struct mddev *mddev, const char *buf, size_t len)
3687 err = kstrtouint(buf, 10, &n);
3691 err = mddev_lock(mddev);
3695 err = update_raid_disks(mddev, n);
3696 else if (mddev->reshape_position != MaxSector) {
3697 struct md_rdev *rdev;
3698 int olddisks = mddev->raid_disks - mddev->delta_disks;
3701 rdev_for_each(rdev, mddev) {
3703 rdev->data_offset < rdev->new_data_offset)
3706 rdev->data_offset > rdev->new_data_offset)
3710 mddev->delta_disks = n - olddisks;
3711 mddev->raid_disks = n;
3712 mddev->reshape_backwards = (mddev->delta_disks < 0);
3714 mddev->raid_disks = n;
3716 mddev_unlock(mddev);
3717 return err ? err : len;
3719 static struct md_sysfs_entry md_raid_disks =
3720 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
3723 chunk_size_show(struct mddev *mddev, char *page)
3725 if (mddev->reshape_position != MaxSector &&
3726 mddev->chunk_sectors != mddev->new_chunk_sectors)
3727 return sprintf(page, "%d (%d)\n",
3728 mddev->new_chunk_sectors << 9,
3729 mddev->chunk_sectors << 9);
3730 return sprintf(page, "%d\n", mddev->chunk_sectors << 9);
3734 chunk_size_store(struct mddev *mddev, const char *buf, size_t len)
3739 err = kstrtoul(buf, 10, &n);
3743 err = mddev_lock(mddev);
3747 if (mddev->pers->check_reshape == NULL)
3752 mddev->new_chunk_sectors = n >> 9;
3753 err = mddev->pers->check_reshape(mddev);
3755 mddev->new_chunk_sectors = mddev->chunk_sectors;
3758 mddev->new_chunk_sectors = n >> 9;
3759 if (mddev->reshape_position == MaxSector)
3760 mddev->chunk_sectors = n >> 9;
3762 mddev_unlock(mddev);
3765 static struct md_sysfs_entry md_chunk_size =
3766 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
3769 resync_start_show(struct mddev *mddev, char *page)
3771 if (mddev->recovery_cp == MaxSector)
3772 return sprintf(page, "none\n");
3773 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
3777 resync_start_store(struct mddev *mddev, const char *buf, size_t len)
3779 unsigned long long n;
3782 if (cmd_match(buf, "none"))
3785 err = kstrtoull(buf, 10, &n);
3788 if (n != (sector_t)n)
3792 err = mddev_lock(mddev);
3795 if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
3799 mddev->recovery_cp = n;
3801 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
3803 mddev_unlock(mddev);
3806 static struct md_sysfs_entry md_resync_start =
3807 __ATTR_PREALLOC(resync_start, S_IRUGO|S_IWUSR,
3808 resync_start_show, resync_start_store);
3811 * The array state can be:
3814 * No devices, no size, no level
3815 * Equivalent to STOP_ARRAY ioctl
3817 * May have some settings, but array is not active
3818 * all IO results in error
3819 * When written, doesn't tear down array, but just stops it
3820 * suspended (not supported yet)
3821 * All IO requests will block. The array can be reconfigured.
3822 * Writing this, if accepted, will block until array is quiescent
3824 * no resync can happen. no superblocks get written.
3825 * write requests fail
3827 * like readonly, but behaves like 'clean' on a write request.
3829 * clean - no pending writes, but otherwise active.
3830 * When written to inactive array, starts without resync
3831 * If a write request arrives then
3832 * if metadata is known, mark 'dirty' and switch to 'active'.
3833 * if not known, block and switch to write-pending
3834 * If written to an active array that has pending writes, then fails.
3836 * fully active: IO and resync can be happening.
3837 * When written to inactive array, starts with resync
3840 * clean, but writes are blocked waiting for 'active' to be written.
3843 * like active, but no writes have been seen for a while (100msec).
3846 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
3847 write_pending, active_idle, bad_word};
3848 static char *array_states[] = {
3849 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3850 "write-pending", "active-idle", NULL };
3852 static int match_word(const char *word, char **list)
3855 for (n=0; list[n]; n++)
3856 if (cmd_match(word, list[n]))
3862 array_state_show(struct mddev *mddev, char *page)
3864 enum array_state st = inactive;
3875 if (test_bit(MD_CHANGE_PENDING, &mddev->flags))
3877 else if (mddev->in_sync)
3879 else if (mddev->safemode)
3885 if (list_empty(&mddev->disks) &&
3886 mddev->raid_disks == 0 &&
3887 mddev->dev_sectors == 0)
3892 return sprintf(page, "%s\n", array_states[st]);
3895 static int do_md_stop(struct mddev *mddev, int ro, struct block_device *bdev);
3896 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev);
3897 static int do_md_run(struct mddev *mddev);
3898 static int restart_array(struct mddev *mddev);
3901 array_state_store(struct mddev *mddev, const char *buf, size_t len)
3904 enum array_state st = match_word(buf, array_states);
3906 if (mddev->pers && (st == active || st == clean) && mddev->ro != 1) {
3907 /* don't take reconfig_mutex when toggling between
3910 spin_lock(&mddev->lock);
3912 restart_array(mddev);
3913 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
3914 md_wakeup_thread(mddev->thread);
3915 wake_up(&mddev->sb_wait);
3917 } else /* st == clean */ {
3918 restart_array(mddev);
3919 if (atomic_read(&mddev->writes_pending) == 0) {
3920 if (mddev->in_sync == 0) {
3922 if (mddev->safemode == 1)
3923 mddev->safemode = 0;
3924 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
3931 sysfs_notify_dirent_safe(mddev->sysfs_state);
3932 spin_unlock(&mddev->lock);
3935 err = mddev_lock(mddev);
3943 /* stopping an active array */
3944 err = do_md_stop(mddev, 0, NULL);
3947 /* stopping an active array */
3949 err = do_md_stop(mddev, 2, NULL);
3951 err = 0; /* already inactive */
3954 break; /* not supported yet */
3957 err = md_set_readonly(mddev, NULL);
3960 set_disk_ro(mddev->gendisk, 1);
3961 err = do_md_run(mddev);
3967 err = md_set_readonly(mddev, NULL);
3968 else if (mddev->ro == 1)
3969 err = restart_array(mddev);
3972 set_disk_ro(mddev->gendisk, 0);
3976 err = do_md_run(mddev);
3981 err = restart_array(mddev);
3984 spin_lock(&mddev->lock);
3985 if (atomic_read(&mddev->writes_pending) == 0) {
3986 if (mddev->in_sync == 0) {
3988 if (mddev->safemode == 1)
3989 mddev->safemode = 0;
3990 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
3995 spin_unlock(&mddev->lock);
4001 err = restart_array(mddev);
4004 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
4005 wake_up(&mddev->sb_wait);
4009 set_disk_ro(mddev->gendisk, 0);
4010 err = do_md_run(mddev);
4015 /* these cannot be set */
4020 if (mddev->hold_active == UNTIL_IOCTL)
4021 mddev->hold_active = 0;
4022 sysfs_notify_dirent_safe(mddev->sysfs_state);
4024 mddev_unlock(mddev);
4027 static struct md_sysfs_entry md_array_state =
4028 __ATTR_PREALLOC(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
4031 max_corrected_read_errors_show(struct mddev *mddev, char *page) {
4032 return sprintf(page, "%d\n",
4033 atomic_read(&mddev->max_corr_read_errors));
4037 max_corrected_read_errors_store(struct mddev *mddev, const char *buf, size_t len)
4042 rv = kstrtouint(buf, 10, &n);
4045 atomic_set(&mddev->max_corr_read_errors, n);
4049 static struct md_sysfs_entry max_corr_read_errors =
4050 __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show,
4051 max_corrected_read_errors_store);
4054 null_show(struct mddev *mddev, char *page)
4060 new_dev_store(struct mddev *mddev, const char *buf, size_t len)
4062 /* buf must be %d:%d\n? giving major and minor numbers */
4063 /* The new device is added to the array.
4064 * If the array has a persistent superblock, we read the
4065 * superblock to initialise info and check validity.
4066 * Otherwise, only checking done is that in bind_rdev_to_array,
4067 * which mainly checks size.
4070 int major = simple_strtoul(buf, &e, 10);
4073 struct md_rdev *rdev;
4076 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
4078 minor = simple_strtoul(e+1, &e, 10);
4079 if (*e && *e != '\n')
4081 dev = MKDEV(major, minor);
4082 if (major != MAJOR(dev) ||
4083 minor != MINOR(dev))
4086 flush_workqueue(md_misc_wq);
4088 err = mddev_lock(mddev);
4091 if (mddev->persistent) {
4092 rdev = md_import_device(dev, mddev->major_version,
4093 mddev->minor_version);
4094 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
4095 struct md_rdev *rdev0
4096 = list_entry(mddev->disks.next,
4097 struct md_rdev, same_set);
4098 err = super_types[mddev->major_version]
4099 .load_super(rdev, rdev0, mddev->minor_version);
4103 } else if (mddev->external)
4104 rdev = md_import_device(dev, -2, -1);
4106 rdev = md_import_device(dev, -1, -1);
4109 mddev_unlock(mddev);
4110 return PTR_ERR(rdev);
4112 err = bind_rdev_to_array(rdev, mddev);
4116 mddev_unlock(mddev);
4117 return err ? err : len;
4120 static struct md_sysfs_entry md_new_device =
4121 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
4124 bitmap_store(struct mddev *mddev, const char *buf, size_t len)
4127 unsigned long chunk, end_chunk;
4130 err = mddev_lock(mddev);
4135 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
4137 chunk = end_chunk = simple_strtoul(buf, &end, 0);
4138 if (buf == end) break;
4139 if (*end == '-') { /* range */
4141 end_chunk = simple_strtoul(buf, &end, 0);
4142 if (buf == end) break;
4144 if (*end && !isspace(*end)) break;
4145 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
4146 buf = skip_spaces(end);
4148 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
4150 mddev_unlock(mddev);
4154 static struct md_sysfs_entry md_bitmap =
4155 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
4158 size_show(struct mddev *mddev, char *page)
4160 return sprintf(page, "%llu\n",
4161 (unsigned long long)mddev->dev_sectors / 2);
4164 static int update_size(struct mddev *mddev, sector_t num_sectors);
4167 size_store(struct mddev *mddev, const char *buf, size_t len)
4169 /* If array is inactive, we can reduce the component size, but
4170 * not increase it (except from 0).
4171 * If array is active, we can try an on-line resize
4174 int err = strict_blocks_to_sectors(buf, §ors);
4178 err = mddev_lock(mddev);
4182 err = update_size(mddev, sectors);
4184 md_update_sb(mddev, 1);
4186 if (mddev->dev_sectors == 0 ||
4187 mddev->dev_sectors > sectors)
4188 mddev->dev_sectors = sectors;
4192 mddev_unlock(mddev);
4193 return err ? err : len;
4196 static struct md_sysfs_entry md_size =
4197 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
4199 /* Metadata version.
4201 * 'none' for arrays with no metadata (good luck...)
4202 * 'external' for arrays with externally managed metadata,
4203 * or N.M for internally known formats
4206 metadata_show(struct mddev *mddev, char *page)
4208 if (mddev->persistent)
4209 return sprintf(page, "%d.%d\n",
4210 mddev->major_version, mddev->minor_version);
4211 else if (mddev->external)
4212 return sprintf(page, "external:%s\n", mddev->metadata_type);
4214 return sprintf(page, "none\n");
4218 metadata_store(struct mddev *mddev, const char *buf, size_t len)
4223 /* Changing the details of 'external' metadata is
4224 * always permitted. Otherwise there must be
4225 * no devices attached to the array.
4228 err = mddev_lock(mddev);
4232 if (mddev->external && strncmp(buf, "external:", 9) == 0)
4234 else if (!list_empty(&mddev->disks))
4238 if (cmd_match(buf, "none")) {
4239 mddev->persistent = 0;
4240 mddev->external = 0;
4241 mddev->major_version = 0;
4242 mddev->minor_version = 90;
4245 if (strncmp(buf, "external:", 9) == 0) {
4246 size_t namelen = len-9;
4247 if (namelen >= sizeof(mddev->metadata_type))
4248 namelen = sizeof(mddev->metadata_type)-1;
4249 strncpy(mddev->metadata_type, buf+9, namelen);
4250 mddev->metadata_type[namelen] = 0;
4251 if (namelen && mddev->metadata_type[namelen-1] == '\n')
4252 mddev->metadata_type[--namelen] = 0;
4253 mddev->persistent = 0;
4254 mddev->external = 1;
4255 mddev->major_version = 0;
4256 mddev->minor_version = 90;
4259 major = simple_strtoul(buf, &e, 10);
4261 if (e==buf || *e != '.')
4264 minor = simple_strtoul(buf, &e, 10);
4265 if (e==buf || (*e && *e != '\n') )
4268 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
4270 mddev->major_version = major;
4271 mddev->minor_version = minor;
4272 mddev->persistent = 1;
4273 mddev->external = 0;
4276 mddev_unlock(mddev);
4280 static struct md_sysfs_entry md_metadata =
4281 __ATTR_PREALLOC(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
4284 action_show(struct mddev *mddev, char *page)
4286 char *type = "idle";
4287 unsigned long recovery = mddev->recovery;
4288 if (test_bit(MD_RECOVERY_FROZEN, &recovery))
4290 else if (test_bit(MD_RECOVERY_RUNNING, &recovery) ||
4291 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &recovery))) {
4292 if (test_bit(MD_RECOVERY_RESHAPE, &recovery))
4294 else if (test_bit(MD_RECOVERY_SYNC, &recovery)) {
4295 if (!test_bit(MD_RECOVERY_REQUESTED, &recovery))
4297 else if (test_bit(MD_RECOVERY_CHECK, &recovery))
4301 } else if (test_bit(MD_RECOVERY_RECOVER, &recovery))
4303 else if (mddev->reshape_position != MaxSector)
4306 return sprintf(page, "%s\n", type);
4310 action_store(struct mddev *mddev, const char *page, size_t len)
4312 if (!mddev->pers || !mddev->pers->sync_request)
4316 if (cmd_match(page, "idle") || cmd_match(page, "frozen")) {
4317 if (cmd_match(page, "frozen"))
4318 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4320 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4321 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
4322 mddev_lock(mddev) == 0) {
4323 flush_workqueue(md_misc_wq);
4324 if (mddev->sync_thread) {
4325 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4326 md_reap_sync_thread(mddev);
4328 mddev_unlock(mddev);
4330 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4332 else if (cmd_match(page, "resync"))
4333 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4334 else if (cmd_match(page, "recover")) {
4335 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4336 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
4337 } else if (cmd_match(page, "reshape")) {
4339 if (mddev->pers->start_reshape == NULL)
4341 err = mddev_lock(mddev);
4343 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4346 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4347 err = mddev->pers->start_reshape(mddev);
4349 mddev_unlock(mddev);
4353 sysfs_notify(&mddev->kobj, NULL, "degraded");
4355 if (cmd_match(page, "check"))
4356 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
4357 else if (!cmd_match(page, "repair"))
4359 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4360 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
4361 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
4363 if (mddev->ro == 2) {
4364 /* A write to sync_action is enough to justify
4365 * canceling read-auto mode
4368 md_wakeup_thread(mddev->sync_thread);
4370 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4371 md_wakeup_thread(mddev->thread);
4372 sysfs_notify_dirent_safe(mddev->sysfs_action);
4376 static struct md_sysfs_entry md_scan_mode =
4377 __ATTR_PREALLOC(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
4380 last_sync_action_show(struct mddev *mddev, char *page)
4382 return sprintf(page, "%s\n", mddev->last_sync_action);
4385 static struct md_sysfs_entry md_last_scan_mode = __ATTR_RO(last_sync_action);
4388 mismatch_cnt_show(struct mddev *mddev, char *page)
4390 return sprintf(page, "%llu\n",
4391 (unsigned long long)
4392 atomic64_read(&mddev->resync_mismatches));
4395 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
4398 sync_min_show(struct mddev *mddev, char *page)
4400 return sprintf(page, "%d (%s)\n", speed_min(mddev),
4401 mddev->sync_speed_min ? "local": "system");
4405 sync_min_store(struct mddev *mddev, const char *buf, size_t len)
4410 if (strncmp(buf, "system", 6)==0) {
4413 rv = kstrtouint(buf, 10, &min);
4419 mddev->sync_speed_min = min;
4423 static struct md_sysfs_entry md_sync_min =
4424 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
4427 sync_max_show(struct mddev *mddev, char *page)
4429 return sprintf(page, "%d (%s)\n", speed_max(mddev),
4430 mddev->sync_speed_max ? "local": "system");
4434 sync_max_store(struct mddev *mddev, const char *buf, size_t len)
4439 if (strncmp(buf, "system", 6)==0) {
4442 rv = kstrtouint(buf, 10, &max);
4448 mddev->sync_speed_max = max;
4452 static struct md_sysfs_entry md_sync_max =
4453 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
4456 degraded_show(struct mddev *mddev, char *page)
4458 return sprintf(page, "%d\n", mddev->degraded);
4460 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
4463 sync_force_parallel_show(struct mddev *mddev, char *page)
4465 return sprintf(page, "%d\n", mddev->parallel_resync);
4469 sync_force_parallel_store(struct mddev *mddev, const char *buf, size_t len)
4473 if (kstrtol(buf, 10, &n))
4476 if (n != 0 && n != 1)
4479 mddev->parallel_resync = n;
4481 if (mddev->sync_thread)
4482 wake_up(&resync_wait);
4487 /* force parallel resync, even with shared block devices */
4488 static struct md_sysfs_entry md_sync_force_parallel =
4489 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
4490 sync_force_parallel_show, sync_force_parallel_store);
4493 sync_speed_show(struct mddev *mddev, char *page)
4495 unsigned long resync, dt, db;
4496 if (mddev->curr_resync == 0)
4497 return sprintf(page, "none\n");
4498 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
4499 dt = (jiffies - mddev->resync_mark) / HZ;
4501 db = resync - mddev->resync_mark_cnt;
4502 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
4505 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
4508 sync_completed_show(struct mddev *mddev, char *page)
4510 unsigned long long max_sectors, resync;
4512 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4513 return sprintf(page, "none\n");
4515 if (mddev->curr_resync == 1 ||
4516 mddev->curr_resync == 2)
4517 return sprintf(page, "delayed\n");
4519 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
4520 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
4521 max_sectors = mddev->resync_max_sectors;
4523 max_sectors = mddev->dev_sectors;
4525 resync = mddev->curr_resync_completed;
4526 return sprintf(page, "%llu / %llu\n", resync, max_sectors);
4529 static struct md_sysfs_entry md_sync_completed =
4530 __ATTR_PREALLOC(sync_completed, S_IRUGO, sync_completed_show, NULL);
4533 min_sync_show(struct mddev *mddev, char *page)
4535 return sprintf(page, "%llu\n",
4536 (unsigned long long)mddev->resync_min);
4539 min_sync_store(struct mddev *mddev, const char *buf, size_t len)
4541 unsigned long long min;
4544 if (kstrtoull(buf, 10, &min))
4547 spin_lock(&mddev->lock);
4549 if (min > mddev->resync_max)
4553 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4556 /* Round down to multiple of 4K for safety */
4557 mddev->resync_min = round_down(min, 8);
4561 spin_unlock(&mddev->lock);
4565 static struct md_sysfs_entry md_min_sync =
4566 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
4569 max_sync_show(struct mddev *mddev, char *page)
4571 if (mddev->resync_max == MaxSector)
4572 return sprintf(page, "max\n");
4574 return sprintf(page, "%llu\n",
4575 (unsigned long long)mddev->resync_max);
4578 max_sync_store(struct mddev *mddev, const char *buf, size_t len)
4581 spin_lock(&mddev->lock);
4582 if (strncmp(buf, "max", 3) == 0)
4583 mddev->resync_max = MaxSector;
4585 unsigned long long max;
4589 if (kstrtoull(buf, 10, &max))
4591 if (max < mddev->resync_min)
4595 if (max < mddev->resync_max &&
4597 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4600 /* Must be a multiple of chunk_size */
4601 chunk = mddev->chunk_sectors;
4603 sector_t temp = max;
4606 if (sector_div(temp, chunk))
4609 mddev->resync_max = max;
4611 wake_up(&mddev->recovery_wait);
4614 spin_unlock(&mddev->lock);
4618 static struct md_sysfs_entry md_max_sync =
4619 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
4622 suspend_lo_show(struct mddev *mddev, char *page)
4624 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
4628 suspend_lo_store(struct mddev *mddev, const char *buf, size_t len)
4630 unsigned long long old, new;
4633 err = kstrtoull(buf, 10, &new);
4636 if (new != (sector_t)new)
4639 err = mddev_lock(mddev);
4643 if (mddev->pers == NULL ||
4644 mddev->pers->quiesce == NULL)
4646 old = mddev->suspend_lo;
4647 mddev->suspend_lo = new;
4649 /* Shrinking suspended region */
4650 mddev->pers->quiesce(mddev, 2);
4652 /* Expanding suspended region - need to wait */
4653 mddev->pers->quiesce(mddev, 1);
4654 mddev->pers->quiesce(mddev, 0);
4658 mddev_unlock(mddev);
4661 static struct md_sysfs_entry md_suspend_lo =
4662 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
4665 suspend_hi_show(struct mddev *mddev, char *page)
4667 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
4671 suspend_hi_store(struct mddev *mddev, const char *buf, size_t len)
4673 unsigned long long old, new;
4676 err = kstrtoull(buf, 10, &new);
4679 if (new != (sector_t)new)
4682 err = mddev_lock(mddev);
4686 if (mddev->pers == NULL ||
4687 mddev->pers->quiesce == NULL)
4689 old = mddev->suspend_hi;
4690 mddev->suspend_hi = new;
4692 /* Shrinking suspended region */
4693 mddev->pers->quiesce(mddev, 2);
4695 /* Expanding suspended region - need to wait */
4696 mddev->pers->quiesce(mddev, 1);
4697 mddev->pers->quiesce(mddev, 0);
4701 mddev_unlock(mddev);
4704 static struct md_sysfs_entry md_suspend_hi =
4705 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
4708 reshape_position_show(struct mddev *mddev, char *page)
4710 if (mddev->reshape_position != MaxSector)
4711 return sprintf(page, "%llu\n",
4712 (unsigned long long)mddev->reshape_position);
4713 strcpy(page, "none\n");
4718 reshape_position_store(struct mddev *mddev, const char *buf, size_t len)
4720 struct md_rdev *rdev;
4721 unsigned long long new;
4724 err = kstrtoull(buf, 10, &new);
4727 if (new != (sector_t)new)
4729 err = mddev_lock(mddev);
4735 mddev->reshape_position = new;
4736 mddev->delta_disks = 0;
4737 mddev->reshape_backwards = 0;
4738 mddev->new_level = mddev->level;
4739 mddev->new_layout = mddev->layout;
4740 mddev->new_chunk_sectors = mddev->chunk_sectors;
4741 rdev_for_each(rdev, mddev)
4742 rdev->new_data_offset = rdev->data_offset;
4745 mddev_unlock(mddev);
4749 static struct md_sysfs_entry md_reshape_position =
4750 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
4751 reshape_position_store);
4754 reshape_direction_show(struct mddev *mddev, char *page)
4756 return sprintf(page, "%s\n",
4757 mddev->reshape_backwards ? "backwards" : "forwards");
4761 reshape_direction_store(struct mddev *mddev, const char *buf, size_t len)
4766 if (cmd_match(buf, "forwards"))
4768 else if (cmd_match(buf, "backwards"))
4772 if (mddev->reshape_backwards == backwards)
4775 err = mddev_lock(mddev);
4778 /* check if we are allowed to change */
4779 if (mddev->delta_disks)
4781 else if (mddev->persistent &&
4782 mddev->major_version == 0)
4785 mddev->reshape_backwards = backwards;
4786 mddev_unlock(mddev);
4790 static struct md_sysfs_entry md_reshape_direction =
4791 __ATTR(reshape_direction, S_IRUGO|S_IWUSR, reshape_direction_show,
4792 reshape_direction_store);
4795 array_size_show(struct mddev *mddev, char *page)
4797 if (mddev->external_size)
4798 return sprintf(page, "%llu\n",
4799 (unsigned long long)mddev->array_sectors/2);
4801 return sprintf(page, "default\n");
4805 array_size_store(struct mddev *mddev, const char *buf, size_t len)
4810 err = mddev_lock(mddev);
4814 /* cluster raid doesn't support change array_sectors */
4815 if (mddev_is_clustered(mddev))
4818 if (strncmp(buf, "default", 7) == 0) {
4820 sectors = mddev->pers->size(mddev, 0, 0);
4822 sectors = mddev->array_sectors;
4824 mddev->external_size = 0;
4826 if (strict_blocks_to_sectors(buf, §ors) < 0)
4828 else if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors)
4831 mddev->external_size = 1;
4835 mddev->array_sectors = sectors;
4837 set_capacity(mddev->gendisk, mddev->array_sectors);
4838 revalidate_disk(mddev->gendisk);
4841 mddev_unlock(mddev);
4845 static struct md_sysfs_entry md_array_size =
4846 __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show,
4849 static struct attribute *md_default_attrs[] = {
4852 &md_raid_disks.attr,
4853 &md_chunk_size.attr,
4855 &md_resync_start.attr,
4857 &md_new_device.attr,
4858 &md_safe_delay.attr,
4859 &md_array_state.attr,
4860 &md_reshape_position.attr,
4861 &md_reshape_direction.attr,
4862 &md_array_size.attr,
4863 &max_corr_read_errors.attr,
4867 static struct attribute *md_redundancy_attrs[] = {
4869 &md_last_scan_mode.attr,
4870 &md_mismatches.attr,
4873 &md_sync_speed.attr,
4874 &md_sync_force_parallel.attr,
4875 &md_sync_completed.attr,
4878 &md_suspend_lo.attr,
4879 &md_suspend_hi.attr,
4884 static struct attribute_group md_redundancy_group = {
4886 .attrs = md_redundancy_attrs,
4890 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
4892 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
4893 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
4898 spin_lock(&all_mddevs_lock);
4899 if (list_empty(&mddev->all_mddevs)) {
4900 spin_unlock(&all_mddevs_lock);
4904 spin_unlock(&all_mddevs_lock);
4906 rv = entry->show(mddev, page);
4912 md_attr_store(struct kobject *kobj, struct attribute *attr,
4913 const char *page, size_t length)
4915 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
4916 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
4921 if (!capable(CAP_SYS_ADMIN))
4923 spin_lock(&all_mddevs_lock);
4924 if (list_empty(&mddev->all_mddevs)) {
4925 spin_unlock(&all_mddevs_lock);
4929 spin_unlock(&all_mddevs_lock);
4930 rv = entry->store(mddev, page, length);
4935 static void md_free(struct kobject *ko)
4937 struct mddev *mddev = container_of(ko, struct mddev, kobj);
4939 if (mddev->sysfs_state)
4940 sysfs_put(mddev->sysfs_state);
4943 blk_cleanup_queue(mddev->queue);
4944 if (mddev->gendisk) {
4945 del_gendisk(mddev->gendisk);
4946 put_disk(mddev->gendisk);
4952 static const struct sysfs_ops md_sysfs_ops = {
4953 .show = md_attr_show,
4954 .store = md_attr_store,
4956 static struct kobj_type md_ktype = {
4958 .sysfs_ops = &md_sysfs_ops,
4959 .default_attrs = md_default_attrs,
4964 static void mddev_delayed_delete(struct work_struct *ws)
4966 struct mddev *mddev = container_of(ws, struct mddev, del_work);
4968 sysfs_remove_group(&mddev->kobj, &md_bitmap_group);
4969 kobject_del(&mddev->kobj);
4970 kobject_put(&mddev->kobj);
4973 static int md_alloc(dev_t dev, char *name)
4975 static DEFINE_MUTEX(disks_mutex);
4976 struct mddev *mddev = mddev_find(dev);
4977 struct gendisk *disk;
4986 partitioned = (MAJOR(mddev->unit) != MD_MAJOR);
4987 shift = partitioned ? MdpMinorShift : 0;
4988 unit = MINOR(mddev->unit) >> shift;
4990 /* wait for any previous instance of this device to be
4991 * completely removed (mddev_delayed_delete).
4993 flush_workqueue(md_misc_wq);
4995 mutex_lock(&disks_mutex);
5001 /* Need to ensure that 'name' is not a duplicate.
5003 struct mddev *mddev2;
5004 spin_lock(&all_mddevs_lock);
5006 list_for_each_entry(mddev2, &all_mddevs, all_mddevs)
5007 if (mddev2->gendisk &&
5008 strcmp(mddev2->gendisk->disk_name, name) == 0) {
5009 spin_unlock(&all_mddevs_lock);
5012 spin_unlock(&all_mddevs_lock);
5016 mddev->queue = blk_alloc_queue(GFP_KERNEL);
5019 mddev->queue->queuedata = mddev;
5021 blk_queue_make_request(mddev->queue, md_make_request);
5022 blk_set_stacking_limits(&mddev->queue->limits);
5024 disk = alloc_disk(1 << shift);
5026 blk_cleanup_queue(mddev->queue);
5027 mddev->queue = NULL;
5030 disk->major = MAJOR(mddev->unit);
5031 disk->first_minor = unit << shift;
5033 strcpy(disk->disk_name, name);
5034 else if (partitioned)
5035 sprintf(disk->disk_name, "md_d%d", unit);
5037 sprintf(disk->disk_name, "md%d", unit);
5038 disk->fops = &md_fops;
5039 disk->private_data = mddev;
5040 disk->queue = mddev->queue;
5041 blk_queue_write_cache(mddev->queue, true, true);
5042 /* Allow extended partitions. This makes the
5043 * 'mdp' device redundant, but we can't really
5046 disk->flags |= GENHD_FL_EXT_DEVT;
5047 mddev->gendisk = disk;
5048 /* As soon as we call add_disk(), another thread could get
5049 * through to md_open, so make sure it doesn't get too far
5051 mutex_lock(&mddev->open_mutex);
5054 error = kobject_init_and_add(&mddev->kobj, &md_ktype,
5055 &disk_to_dev(disk)->kobj, "%s", "md");
5057 /* This isn't possible, but as kobject_init_and_add is marked
5058 * __must_check, we must do something with the result
5060 pr_debug("md: cannot register %s/md - name in use\n",
5064 if (mddev->kobj.sd &&
5065 sysfs_create_group(&mddev->kobj, &md_bitmap_group))
5066 pr_debug("pointless warning\n");
5067 mutex_unlock(&mddev->open_mutex);
5069 mutex_unlock(&disks_mutex);
5070 if (!error && mddev->kobj.sd) {
5071 kobject_uevent(&mddev->kobj, KOBJ_ADD);
5072 mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state");
5078 static struct kobject *md_probe(dev_t dev, int *part, void *data)
5080 md_alloc(dev, NULL);
5084 static int add_named_array(const char *val, struct kernel_param *kp)
5086 /* val must be "md_*" where * is not all digits.
5087 * We allocate an array with a large free minor number, and
5088 * set the name to val. val must not already be an active name.
5090 int len = strlen(val);
5091 char buf[DISK_NAME_LEN];
5093 while (len && val[len-1] == '\n')
5095 if (len >= DISK_NAME_LEN)
5097 strlcpy(buf, val, len+1);
5098 if (strncmp(buf, "md_", 3) != 0)
5100 return md_alloc(0, buf);
5103 static void md_safemode_timeout(unsigned long data)
5105 struct mddev *mddev = (struct mddev *) data;
5107 if (!atomic_read(&mddev->writes_pending)) {
5108 mddev->safemode = 1;
5109 if (mddev->external)
5110 sysfs_notify_dirent_safe(mddev->sysfs_state);
5112 md_wakeup_thread(mddev->thread);
5115 static int start_dirty_degraded;
5117 int md_run(struct mddev *mddev)
5120 struct md_rdev *rdev;
5121 struct md_personality *pers;
5123 if (list_empty(&mddev->disks))
5124 /* cannot run an array with no devices.. */
5129 /* Cannot run until previous stop completes properly */
5130 if (mddev->sysfs_active)
5134 * Analyze all RAID superblock(s)
5136 if (!mddev->raid_disks) {
5137 if (!mddev->persistent)
5142 if (mddev->level != LEVEL_NONE)
5143 request_module("md-level-%d", mddev->level);
5144 else if (mddev->clevel[0])
5145 request_module("md-%s", mddev->clevel);
5148 * Drop all container device buffers, from now on
5149 * the only valid external interface is through the md
5152 rdev_for_each(rdev, mddev) {
5153 if (test_bit(Faulty, &rdev->flags))
5155 sync_blockdev(rdev->bdev);
5156 invalidate_bdev(rdev->bdev);
5158 /* perform some consistency tests on the device.
5159 * We don't want the data to overlap the metadata,
5160 * Internal Bitmap issues have been handled elsewhere.
5162 if (rdev->meta_bdev) {
5163 /* Nothing to check */;
5164 } else if (rdev->data_offset < rdev->sb_start) {
5165 if (mddev->dev_sectors &&
5166 rdev->data_offset + mddev->dev_sectors
5168 pr_warn("md: %s: data overlaps metadata\n",
5173 if (rdev->sb_start + rdev->sb_size/512
5174 > rdev->data_offset) {
5175 pr_warn("md: %s: metadata overlaps data\n",
5180 sysfs_notify_dirent_safe(rdev->sysfs_state);
5183 if (mddev->bio_set == NULL)
5184 mddev->bio_set = bioset_create(BIO_POOL_SIZE, 0);
5186 spin_lock(&pers_lock);
5187 pers = find_pers(mddev->level, mddev->clevel);
5188 if (!pers || !try_module_get(pers->owner)) {
5189 spin_unlock(&pers_lock);
5190 if (mddev->level != LEVEL_NONE)
5191 pr_warn("md: personality for level %d is not loaded!\n",
5194 pr_warn("md: personality for level %s is not loaded!\n",
5198 spin_unlock(&pers_lock);
5199 if (mddev->level != pers->level) {
5200 mddev->level = pers->level;
5201 mddev->new_level = pers->level;
5203 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
5205 if (mddev->reshape_position != MaxSector &&
5206 pers->start_reshape == NULL) {
5207 /* This personality cannot handle reshaping... */
5208 module_put(pers->owner);
5212 if (pers->sync_request) {
5213 /* Warn if this is a potentially silly
5216 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
5217 struct md_rdev *rdev2;
5220 rdev_for_each(rdev, mddev)
5221 rdev_for_each(rdev2, mddev) {
5223 rdev->bdev->bd_contains ==
5224 rdev2->bdev->bd_contains) {
5225 pr_warn("%s: WARNING: %s appears to be on the same physical disk as %s.\n",
5227 bdevname(rdev->bdev,b),
5228 bdevname(rdev2->bdev,b2));
5234 pr_warn("True protection against single-disk failure might be compromised.\n");
5237 mddev->recovery = 0;
5238 /* may be over-ridden by personality */
5239 mddev->resync_max_sectors = mddev->dev_sectors;
5241 mddev->ok_start_degraded = start_dirty_degraded;
5243 if (start_readonly && mddev->ro == 0)
5244 mddev->ro = 2; /* read-only, but switch on first write */
5246 err = pers->run(mddev);
5248 pr_warn("md: pers->run() failed ...\n");
5249 else if (pers->size(mddev, 0, 0) < mddev->array_sectors) {
5250 WARN_ONCE(!mddev->external_size,
5251 "%s: default size too small, but 'external_size' not in effect?\n",
5253 pr_warn("md: invalid array_size %llu > default size %llu\n",
5254 (unsigned long long)mddev->array_sectors / 2,
5255 (unsigned long long)pers->size(mddev, 0, 0) / 2);
5258 if (err == 0 && pers->sync_request &&
5259 (mddev->bitmap_info.file || mddev->bitmap_info.offset)) {
5260 struct bitmap *bitmap;
5262 bitmap = bitmap_create(mddev, -1);
5263 if (IS_ERR(bitmap)) {
5264 err = PTR_ERR(bitmap);
5265 pr_warn("%s: failed to create bitmap (%d)\n",
5266 mdname(mddev), err);
5268 mddev->bitmap = bitmap;
5272 mddev_detach(mddev);
5274 pers->free(mddev, mddev->private);
5275 mddev->private = NULL;
5276 module_put(pers->owner);
5277 bitmap_destroy(mddev);
5283 rdev_for_each(rdev, mddev) {
5284 if (rdev->raid_disk >= 0 &&
5285 !blk_queue_nonrot(bdev_get_queue(rdev->bdev))) {
5290 if (mddev->degraded)
5293 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, mddev->queue);
5295 queue_flag_clear_unlocked(QUEUE_FLAG_NONROT, mddev->queue);
5296 mddev->queue->backing_dev_info.congested_data = mddev;
5297 mddev->queue->backing_dev_info.congested_fn = md_congested;
5299 if (pers->sync_request) {
5300 if (mddev->kobj.sd &&
5301 sysfs_create_group(&mddev->kobj, &md_redundancy_group))
5302 pr_warn("md: cannot register extra attributes for %s\n",
5304 mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action");
5305 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
5308 atomic_set(&mddev->writes_pending,0);
5309 atomic_set(&mddev->max_corr_read_errors,
5310 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS);
5311 mddev->safemode = 0;
5312 if (mddev_is_clustered(mddev))
5313 mddev->safemode_delay = 0;
5315 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
5318 spin_lock(&mddev->lock);
5320 spin_unlock(&mddev->lock);
5321 rdev_for_each(rdev, mddev)
5322 if (rdev->raid_disk >= 0)
5323 if (sysfs_link_rdev(mddev, rdev))
5324 /* failure here is OK */;
5326 if (mddev->degraded && !mddev->ro)
5327 /* This ensures that recovering status is reported immediately
5328 * via sysfs - until a lack of spares is confirmed.
5330 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
5331 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5333 if (mddev->flags & MD_UPDATE_SB_FLAGS)
5334 md_update_sb(mddev, 0);
5336 md_new_event(mddev);
5337 sysfs_notify_dirent_safe(mddev->sysfs_state);
5338 sysfs_notify_dirent_safe(mddev->sysfs_action);
5339 sysfs_notify(&mddev->kobj, NULL, "degraded");
5342 EXPORT_SYMBOL_GPL(md_run);
5344 static int do_md_run(struct mddev *mddev)
5348 err = md_run(mddev);
5351 err = bitmap_load(mddev);
5353 bitmap_destroy(mddev);
5357 if (mddev_is_clustered(mddev))
5358 md_allow_write(mddev);
5360 md_wakeup_thread(mddev->thread);
5361 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
5363 set_capacity(mddev->gendisk, mddev->array_sectors);
5364 revalidate_disk(mddev->gendisk);
5366 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
5371 static int restart_array(struct mddev *mddev)
5373 struct gendisk *disk = mddev->gendisk;
5375 /* Complain if it has no devices */
5376 if (list_empty(&mddev->disks))
5382 if (test_bit(MD_HAS_JOURNAL, &mddev->flags)) {
5383 struct md_rdev *rdev;
5384 bool has_journal = false;
5387 rdev_for_each_rcu(rdev, mddev) {
5388 if (test_bit(Journal, &rdev->flags) &&
5389 !test_bit(Faulty, &rdev->flags)) {
5396 /* Don't restart rw with journal missing/faulty */
5401 mddev->safemode = 0;
5403 set_disk_ro(disk, 0);
5404 pr_debug("md: %s switched to read-write mode.\n", mdname(mddev));
5405 /* Kick recovery or resync if necessary */
5406 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5407 md_wakeup_thread(mddev->thread);
5408 md_wakeup_thread(mddev->sync_thread);
5409 sysfs_notify_dirent_safe(mddev->sysfs_state);
5413 static void md_clean(struct mddev *mddev)
5415 mddev->array_sectors = 0;
5416 mddev->external_size = 0;
5417 mddev->dev_sectors = 0;
5418 mddev->raid_disks = 0;
5419 mddev->recovery_cp = 0;
5420 mddev->resync_min = 0;
5421 mddev->resync_max = MaxSector;
5422 mddev->reshape_position = MaxSector;
5423 mddev->external = 0;
5424 mddev->persistent = 0;
5425 mddev->level = LEVEL_NONE;
5426 mddev->clevel[0] = 0;
5429 mddev->metadata_type[0] = 0;
5430 mddev->chunk_sectors = 0;
5431 mddev->ctime = mddev->utime = 0;
5433 mddev->max_disks = 0;
5435 mddev->can_decrease_events = 0;
5436 mddev->delta_disks = 0;
5437 mddev->reshape_backwards = 0;
5438 mddev->new_level = LEVEL_NONE;
5439 mddev->new_layout = 0;
5440 mddev->new_chunk_sectors = 0;
5441 mddev->curr_resync = 0;
5442 atomic64_set(&mddev->resync_mismatches, 0);
5443 mddev->suspend_lo = mddev->suspend_hi = 0;
5444 mddev->sync_speed_min = mddev->sync_speed_max = 0;
5445 mddev->recovery = 0;
5448 mddev->degraded = 0;
5449 mddev->safemode = 0;
5450 mddev->private = NULL;
5451 mddev->cluster_info = NULL;
5452 mddev->bitmap_info.offset = 0;
5453 mddev->bitmap_info.default_offset = 0;
5454 mddev->bitmap_info.default_space = 0;
5455 mddev->bitmap_info.chunksize = 0;
5456 mddev->bitmap_info.daemon_sleep = 0;
5457 mddev->bitmap_info.max_write_behind = 0;
5458 mddev->bitmap_info.nodes = 0;
5461 static void __md_stop_writes(struct mddev *mddev)
5463 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5464 flush_workqueue(md_misc_wq);
5465 if (mddev->sync_thread) {
5466 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5467 md_reap_sync_thread(mddev);
5470 del_timer_sync(&mddev->safemode_timer);
5472 bitmap_flush(mddev);
5473 md_super_wait(mddev);
5475 if (mddev->ro == 0 &&
5476 ((!mddev->in_sync && !mddev_is_clustered(mddev)) ||
5477 (mddev->flags & MD_UPDATE_SB_FLAGS))) {
5478 /* mark array as shutdown cleanly */
5479 if (!mddev_is_clustered(mddev))
5481 md_update_sb(mddev, 1);
5485 void md_stop_writes(struct mddev *mddev)
5487 mddev_lock_nointr(mddev);
5488 __md_stop_writes(mddev);
5489 mddev_unlock(mddev);
5491 EXPORT_SYMBOL_GPL(md_stop_writes);
5493 static void mddev_detach(struct mddev *mddev)
5495 struct bitmap *bitmap = mddev->bitmap;
5496 /* wait for behind writes to complete */
5497 if (bitmap && atomic_read(&bitmap->behind_writes) > 0) {
5498 pr_debug("md:%s: behind writes in progress - waiting to stop.\n",
5500 /* need to kick something here to make sure I/O goes? */
5501 wait_event(bitmap->behind_wait,
5502 atomic_read(&bitmap->behind_writes) == 0);
5504 if (mddev->pers && mddev->pers->quiesce) {
5505 mddev->pers->quiesce(mddev, 1);
5506 mddev->pers->quiesce(mddev, 0);
5508 md_unregister_thread(&mddev->thread);
5510 blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/
5513 static void __md_stop(struct mddev *mddev)
5515 struct md_personality *pers = mddev->pers;
5516 mddev_detach(mddev);
5517 /* Ensure ->event_work is done */
5518 flush_workqueue(md_misc_wq);
5519 spin_lock(&mddev->lock);
5521 spin_unlock(&mddev->lock);
5522 pers->free(mddev, mddev->private);
5523 mddev->private = NULL;
5524 if (pers->sync_request && mddev->to_remove == NULL)
5525 mddev->to_remove = &md_redundancy_group;
5526 module_put(pers->owner);
5527 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5530 void md_stop(struct mddev *mddev)
5532 /* stop the array and free an attached data structures.
5533 * This is called from dm-raid
5536 bitmap_destroy(mddev);
5538 bioset_free(mddev->bio_set);
5541 EXPORT_SYMBOL_GPL(md_stop);
5543 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev)
5548 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
5550 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5551 md_wakeup_thread(mddev->thread);
5553 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5554 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5555 if (mddev->sync_thread)
5556 /* Thread might be blocked waiting for metadata update
5557 * which will now never happen */
5558 wake_up_process(mddev->sync_thread->tsk);
5560 if (mddev->external && test_bit(MD_CHANGE_PENDING, &mddev->flags))
5562 mddev_unlock(mddev);
5563 wait_event(resync_wait, !test_bit(MD_RECOVERY_RUNNING,
5565 wait_event(mddev->sb_wait,
5566 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
5567 mddev_lock_nointr(mddev);
5569 mutex_lock(&mddev->open_mutex);
5570 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
5571 mddev->sync_thread ||
5572 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
5573 pr_warn("md: %s still in use.\n",mdname(mddev));
5575 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5576 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5577 md_wakeup_thread(mddev->thread);
5583 __md_stop_writes(mddev);
5589 set_disk_ro(mddev->gendisk, 1);
5590 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5591 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5592 md_wakeup_thread(mddev->thread);
5593 sysfs_notify_dirent_safe(mddev->sysfs_state);
5597 mutex_unlock(&mddev->open_mutex);
5602 * 0 - completely stop and dis-assemble array
5603 * 2 - stop but do not disassemble array
5605 static int do_md_stop(struct mddev *mddev, int mode,
5606 struct block_device *bdev)
5608 struct gendisk *disk = mddev->gendisk;
5609 struct md_rdev *rdev;
5612 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
5614 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5615 md_wakeup_thread(mddev->thread);
5617 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5618 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5619 if (mddev->sync_thread)
5620 /* Thread might be blocked waiting for metadata update
5621 * which will now never happen */
5622 wake_up_process(mddev->sync_thread->tsk);
5624 mddev_unlock(mddev);
5625 wait_event(resync_wait, (mddev->sync_thread == NULL &&
5626 !test_bit(MD_RECOVERY_RUNNING,
5627 &mddev->recovery)));
5628 mddev_lock_nointr(mddev);
5630 mutex_lock(&mddev->open_mutex);
5631 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
5632 mddev->sysfs_active ||
5633 mddev->sync_thread ||
5634 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
5635 pr_warn("md: %s still in use.\n",mdname(mddev));
5636 mutex_unlock(&mddev->open_mutex);
5638 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5639 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5640 md_wakeup_thread(mddev->thread);
5646 set_disk_ro(disk, 0);
5648 __md_stop_writes(mddev);
5650 mddev->queue->backing_dev_info.congested_fn = NULL;
5652 /* tell userspace to handle 'inactive' */
5653 sysfs_notify_dirent_safe(mddev->sysfs_state);
5655 rdev_for_each(rdev, mddev)
5656 if (rdev->raid_disk >= 0)
5657 sysfs_unlink_rdev(mddev, rdev);
5659 set_capacity(disk, 0);
5660 mutex_unlock(&mddev->open_mutex);
5662 revalidate_disk(disk);
5667 mutex_unlock(&mddev->open_mutex);
5669 * Free resources if final stop
5672 pr_info("md: %s stopped.\n", mdname(mddev));
5674 bitmap_destroy(mddev);
5675 if (mddev->bitmap_info.file) {
5676 struct file *f = mddev->bitmap_info.file;
5677 spin_lock(&mddev->lock);
5678 mddev->bitmap_info.file = NULL;
5679 spin_unlock(&mddev->lock);
5682 mddev->bitmap_info.offset = 0;
5684 export_array(mddev);
5687 if (mddev->hold_active == UNTIL_STOP)
5688 mddev->hold_active = 0;
5690 md_new_event(mddev);
5691 sysfs_notify_dirent_safe(mddev->sysfs_state);
5696 static void autorun_array(struct mddev *mddev)
5698 struct md_rdev *rdev;
5701 if (list_empty(&mddev->disks))
5704 pr_info("md: running: ");
5706 rdev_for_each(rdev, mddev) {
5707 char b[BDEVNAME_SIZE];
5708 pr_cont("<%s>", bdevname(rdev->bdev,b));
5712 err = do_md_run(mddev);
5714 pr_warn("md: do_md_run() returned %d\n", err);
5715 do_md_stop(mddev, 0, NULL);
5720 * lets try to run arrays based on all disks that have arrived
5721 * until now. (those are in pending_raid_disks)
5723 * the method: pick the first pending disk, collect all disks with
5724 * the same UUID, remove all from the pending list and put them into
5725 * the 'same_array' list. Then order this list based on superblock
5726 * update time (freshest comes first), kick out 'old' disks and
5727 * compare superblocks. If everything's fine then run it.
5729 * If "unit" is allocated, then bump its reference count
5731 static void autorun_devices(int part)
5733 struct md_rdev *rdev0, *rdev, *tmp;
5734 struct mddev *mddev;
5735 char b[BDEVNAME_SIZE];
5737 pr_info("md: autorun ...\n");
5738 while (!list_empty(&pending_raid_disks)) {
5741 LIST_HEAD(candidates);
5742 rdev0 = list_entry(pending_raid_disks.next,
5743 struct md_rdev, same_set);
5745 pr_debug("md: considering %s ...\n", bdevname(rdev0->bdev,b));
5746 INIT_LIST_HEAD(&candidates);
5747 rdev_for_each_list(rdev, tmp, &pending_raid_disks)
5748 if (super_90_load(rdev, rdev0, 0) >= 0) {
5749 pr_debug("md: adding %s ...\n",
5750 bdevname(rdev->bdev,b));
5751 list_move(&rdev->same_set, &candidates);
5754 * now we have a set of devices, with all of them having
5755 * mostly sane superblocks. It's time to allocate the
5759 dev = MKDEV(mdp_major,
5760 rdev0->preferred_minor << MdpMinorShift);
5761 unit = MINOR(dev) >> MdpMinorShift;
5763 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
5766 if (rdev0->preferred_minor != unit) {
5767 pr_warn("md: unit number in %s is bad: %d\n",
5768 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
5772 md_probe(dev, NULL, NULL);
5773 mddev = mddev_find(dev);
5774 if (!mddev || !mddev->gendisk) {
5779 if (mddev_lock(mddev))
5780 pr_warn("md: %s locked, cannot run\n", mdname(mddev));
5781 else if (mddev->raid_disks || mddev->major_version
5782 || !list_empty(&mddev->disks)) {
5783 pr_warn("md: %s already running, cannot run %s\n",
5784 mdname(mddev), bdevname(rdev0->bdev,b));
5785 mddev_unlock(mddev);
5787 pr_debug("md: created %s\n", mdname(mddev));
5788 mddev->persistent = 1;
5789 rdev_for_each_list(rdev, tmp, &candidates) {
5790 list_del_init(&rdev->same_set);
5791 if (bind_rdev_to_array(rdev, mddev))
5794 autorun_array(mddev);
5795 mddev_unlock(mddev);
5797 /* on success, candidates will be empty, on error
5800 rdev_for_each_list(rdev, tmp, &candidates) {
5801 list_del_init(&rdev->same_set);
5806 pr_info("md: ... autorun DONE.\n");
5808 #endif /* !MODULE */
5810 static int get_version(void __user *arg)
5814 ver.major = MD_MAJOR_VERSION;
5815 ver.minor = MD_MINOR_VERSION;
5816 ver.patchlevel = MD_PATCHLEVEL_VERSION;
5818 if (copy_to_user(arg, &ver, sizeof(ver)))
5824 static int get_array_info(struct mddev *mddev, void __user *arg)
5826 mdu_array_info_t info;
5827 int nr,working,insync,failed,spare;
5828 struct md_rdev *rdev;
5830 nr = working = insync = failed = spare = 0;
5832 rdev_for_each_rcu(rdev, mddev) {
5834 if (test_bit(Faulty, &rdev->flags))
5838 if (test_bit(In_sync, &rdev->flags))
5840 else if (test_bit(Journal, &rdev->flags))
5841 /* TODO: add journal count to md_u.h */
5849 info.major_version = mddev->major_version;
5850 info.minor_version = mddev->minor_version;
5851 info.patch_version = MD_PATCHLEVEL_VERSION;
5852 info.ctime = clamp_t(time64_t, mddev->ctime, 0, U32_MAX);
5853 info.level = mddev->level;
5854 info.size = mddev->dev_sectors / 2;
5855 if (info.size != mddev->dev_sectors / 2) /* overflow */
5858 info.raid_disks = mddev->raid_disks;
5859 info.md_minor = mddev->md_minor;
5860 info.not_persistent= !mddev->persistent;
5862 info.utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX);
5865 info.state = (1<<MD_SB_CLEAN);
5866 if (mddev->bitmap && mddev->bitmap_info.offset)
5867 info.state |= (1<<MD_SB_BITMAP_PRESENT);
5868 if (mddev_is_clustered(mddev))
5869 info.state |= (1<<MD_SB_CLUSTERED);
5870 info.active_disks = insync;
5871 info.working_disks = working;
5872 info.failed_disks = failed;
5873 info.spare_disks = spare;
5875 info.layout = mddev->layout;
5876 info.chunk_size = mddev->chunk_sectors << 9;
5878 if (copy_to_user(arg, &info, sizeof(info)))
5884 static int get_bitmap_file(struct mddev *mddev, void __user * arg)
5886 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
5890 file = kzalloc(sizeof(*file), GFP_NOIO);
5895 spin_lock(&mddev->lock);
5896 /* bitmap enabled */
5897 if (mddev->bitmap_info.file) {
5898 ptr = file_path(mddev->bitmap_info.file, file->pathname,
5899 sizeof(file->pathname));
5903 memmove(file->pathname, ptr,
5904 sizeof(file->pathname)-(ptr-file->pathname));
5906 spin_unlock(&mddev->lock);
5909 copy_to_user(arg, file, sizeof(*file)))
5916 static int get_disk_info(struct mddev *mddev, void __user * arg)
5918 mdu_disk_info_t info;
5919 struct md_rdev *rdev;
5921 if (copy_from_user(&info, arg, sizeof(info)))
5925 rdev = md_find_rdev_nr_rcu(mddev, info.number);
5927 info.major = MAJOR(rdev->bdev->bd_dev);
5928 info.minor = MINOR(rdev->bdev->bd_dev);
5929 info.raid_disk = rdev->raid_disk;
5931 if (test_bit(Faulty, &rdev->flags))
5932 info.state |= (1<<MD_DISK_FAULTY);
5933 else if (test_bit(In_sync, &rdev->flags)) {
5934 info.state |= (1<<MD_DISK_ACTIVE);
5935 info.state |= (1<<MD_DISK_SYNC);
5937 if (test_bit(Journal, &rdev->flags))
5938 info.state |= (1<<MD_DISK_JOURNAL);
5939 if (test_bit(WriteMostly, &rdev->flags))
5940 info.state |= (1<<MD_DISK_WRITEMOSTLY);
5942 info.major = info.minor = 0;
5943 info.raid_disk = -1;
5944 info.state = (1<<MD_DISK_REMOVED);
5948 if (copy_to_user(arg, &info, sizeof(info)))
5954 static int add_new_disk(struct mddev *mddev, mdu_disk_info_t *info)
5956 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
5957 struct md_rdev *rdev;
5958 dev_t dev = MKDEV(info->major,info->minor);
5960 if (mddev_is_clustered(mddev) &&
5961 !(info->state & ((1 << MD_DISK_CLUSTER_ADD) | (1 << MD_DISK_CANDIDATE)))) {
5962 pr_warn("%s: Cannot add to clustered mddev.\n",
5967 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
5970 if (!mddev->raid_disks) {
5972 /* expecting a device which has a superblock */
5973 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
5975 pr_warn("md: md_import_device returned %ld\n",
5977 return PTR_ERR(rdev);
5979 if (!list_empty(&mddev->disks)) {
5980 struct md_rdev *rdev0
5981 = list_entry(mddev->disks.next,
5982 struct md_rdev, same_set);
5983 err = super_types[mddev->major_version]
5984 .load_super(rdev, rdev0, mddev->minor_version);
5986 pr_warn("md: %s has different UUID to %s\n",
5987 bdevname(rdev->bdev,b),
5988 bdevname(rdev0->bdev,b2));
5993 err = bind_rdev_to_array(rdev, mddev);
6000 * add_new_disk can be used once the array is assembled
6001 * to add "hot spares". They must already have a superblock
6006 if (!mddev->pers->hot_add_disk) {
6007 pr_warn("%s: personality does not support diskops!\n",
6011 if (mddev->persistent)
6012 rdev = md_import_device(dev, mddev->major_version,
6013 mddev->minor_version);
6015 rdev = md_import_device(dev, -1, -1);
6017 pr_warn("md: md_import_device returned %ld\n",
6019 return PTR_ERR(rdev);
6021 /* set saved_raid_disk if appropriate */
6022 if (!mddev->persistent) {
6023 if (info->state & (1<<MD_DISK_SYNC) &&
6024 info->raid_disk < mddev->raid_disks) {
6025 rdev->raid_disk = info->raid_disk;
6026 set_bit(In_sync, &rdev->flags);
6027 clear_bit(Bitmap_sync, &rdev->flags);
6029 rdev->raid_disk = -1;
6030 rdev->saved_raid_disk = rdev->raid_disk;
6032 super_types[mddev->major_version].
6033 validate_super(mddev, rdev);
6034 if ((info->state & (1<<MD_DISK_SYNC)) &&
6035 rdev->raid_disk != info->raid_disk) {
6036 /* This was a hot-add request, but events doesn't
6037 * match, so reject it.
6043 clear_bit(In_sync, &rdev->flags); /* just to be sure */
6044 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
6045 set_bit(WriteMostly, &rdev->flags);
6047 clear_bit(WriteMostly, &rdev->flags);
6049 if (info->state & (1<<MD_DISK_JOURNAL)) {
6050 struct md_rdev *rdev2;
6051 bool has_journal = false;
6053 /* make sure no existing journal disk */
6054 rdev_for_each(rdev2, mddev) {
6055 if (test_bit(Journal, &rdev2->flags)) {
6064 set_bit(Journal, &rdev->flags);
6067 * check whether the device shows up in other nodes
6069 if (mddev_is_clustered(mddev)) {
6070 if (info->state & (1 << MD_DISK_CANDIDATE))
6071 set_bit(Candidate, &rdev->flags);
6072 else if (info->state & (1 << MD_DISK_CLUSTER_ADD)) {
6073 /* --add initiated by this node */
6074 err = md_cluster_ops->add_new_disk(mddev, rdev);
6082 rdev->raid_disk = -1;
6083 err = bind_rdev_to_array(rdev, mddev);
6088 if (mddev_is_clustered(mddev)) {
6089 if (info->state & (1 << MD_DISK_CANDIDATE)) {
6091 err = md_cluster_ops->new_disk_ack(mddev,
6094 md_kick_rdev_from_array(rdev);
6098 md_cluster_ops->add_new_disk_cancel(mddev);
6100 err = add_bound_rdev(rdev);
6104 err = add_bound_rdev(rdev);
6109 /* otherwise, add_new_disk is only allowed
6110 * for major_version==0 superblocks
6112 if (mddev->major_version != 0) {
6113 pr_warn("%s: ADD_NEW_DISK not supported\n", mdname(mddev));
6117 if (!(info->state & (1<<MD_DISK_FAULTY))) {
6119 rdev = md_import_device(dev, -1, 0);
6121 pr_warn("md: error, md_import_device() returned %ld\n",
6123 return PTR_ERR(rdev);
6125 rdev->desc_nr = info->number;
6126 if (info->raid_disk < mddev->raid_disks)
6127 rdev->raid_disk = info->raid_disk;
6129 rdev->raid_disk = -1;
6131 if (rdev->raid_disk < mddev->raid_disks)
6132 if (info->state & (1<<MD_DISK_SYNC))
6133 set_bit(In_sync, &rdev->flags);
6135 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
6136 set_bit(WriteMostly, &rdev->flags);
6138 if (!mddev->persistent) {
6139 pr_debug("md: nonpersistent superblock ...\n");
6140 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
6142 rdev->sb_start = calc_dev_sboffset(rdev);
6143 rdev->sectors = rdev->sb_start;
6145 err = bind_rdev_to_array(rdev, mddev);
6155 static int hot_remove_disk(struct mddev *mddev, dev_t dev)
6157 char b[BDEVNAME_SIZE];
6158 struct md_rdev *rdev;
6160 rdev = find_rdev(mddev, dev);
6164 if (rdev->raid_disk < 0)
6167 clear_bit(Blocked, &rdev->flags);
6168 remove_and_add_spares(mddev, rdev);
6170 if (rdev->raid_disk >= 0)
6174 if (mddev_is_clustered(mddev))
6175 md_cluster_ops->remove_disk(mddev, rdev);
6177 md_kick_rdev_from_array(rdev);
6178 md_update_sb(mddev, 1);
6179 md_new_event(mddev);
6183 pr_debug("md: cannot remove active disk %s from %s ...\n",
6184 bdevname(rdev->bdev,b), mdname(mddev));
6188 static int hot_add_disk(struct mddev *mddev, dev_t dev)
6190 char b[BDEVNAME_SIZE];
6192 struct md_rdev *rdev;
6197 if (mddev->major_version != 0) {
6198 pr_warn("%s: HOT_ADD may only be used with version-0 superblocks.\n",
6202 if (!mddev->pers->hot_add_disk) {
6203 pr_warn("%s: personality does not support diskops!\n",
6208 rdev = md_import_device(dev, -1, 0);
6210 pr_warn("md: error, md_import_device() returned %ld\n",
6215 if (mddev->persistent)
6216 rdev->sb_start = calc_dev_sboffset(rdev);
6218 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
6220 rdev->sectors = rdev->sb_start;
6222 if (test_bit(Faulty, &rdev->flags)) {
6223 pr_warn("md: can not hot-add faulty %s disk to %s!\n",
6224 bdevname(rdev->bdev,b), mdname(mddev));
6229 clear_bit(In_sync, &rdev->flags);
6231 rdev->saved_raid_disk = -1;
6232 err = bind_rdev_to_array(rdev, mddev);
6237 * The rest should better be atomic, we can have disk failures
6238 * noticed in interrupt contexts ...
6241 rdev->raid_disk = -1;
6243 md_update_sb(mddev, 1);
6245 * Kick recovery, maybe this spare has to be added to the
6246 * array immediately.
6248 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6249 md_wakeup_thread(mddev->thread);
6250 md_new_event(mddev);
6258 static int set_bitmap_file(struct mddev *mddev, int fd)
6263 if (!mddev->pers->quiesce || !mddev->thread)
6265 if (mddev->recovery || mddev->sync_thread)
6267 /* we should be able to change the bitmap.. */
6271 struct inode *inode;
6274 if (mddev->bitmap || mddev->bitmap_info.file)
6275 return -EEXIST; /* cannot add when bitmap is present */
6279 pr_warn("%s: error: failed to get bitmap file\n",
6284 inode = f->f_mapping->host;
6285 if (!S_ISREG(inode->i_mode)) {
6286 pr_warn("%s: error: bitmap file must be a regular file\n",
6289 } else if (!(f->f_mode & FMODE_WRITE)) {
6290 pr_warn("%s: error: bitmap file must open for write\n",
6293 } else if (atomic_read(&inode->i_writecount) != 1) {
6294 pr_warn("%s: error: bitmap file is already in use\n",
6302 mddev->bitmap_info.file = f;
6303 mddev->bitmap_info.offset = 0; /* file overrides offset */
6304 } else if (mddev->bitmap == NULL)
6305 return -ENOENT; /* cannot remove what isn't there */
6308 mddev->pers->quiesce(mddev, 1);
6310 struct bitmap *bitmap;
6312 bitmap = bitmap_create(mddev, -1);
6313 if (!IS_ERR(bitmap)) {
6314 mddev->bitmap = bitmap;
6315 err = bitmap_load(mddev);
6317 err = PTR_ERR(bitmap);
6319 if (fd < 0 || err) {
6320 bitmap_destroy(mddev);
6321 fd = -1; /* make sure to put the file */
6323 mddev->pers->quiesce(mddev, 0);
6326 struct file *f = mddev->bitmap_info.file;
6328 spin_lock(&mddev->lock);
6329 mddev->bitmap_info.file = NULL;
6330 spin_unlock(&mddev->lock);
6339 * set_array_info is used two different ways
6340 * The original usage is when creating a new array.
6341 * In this usage, raid_disks is > 0 and it together with
6342 * level, size, not_persistent,layout,chunksize determine the
6343 * shape of the array.
6344 * This will always create an array with a type-0.90.0 superblock.
6345 * The newer usage is when assembling an array.
6346 * In this case raid_disks will be 0, and the major_version field is
6347 * use to determine which style super-blocks are to be found on the devices.
6348 * The minor and patch _version numbers are also kept incase the
6349 * super_block handler wishes to interpret them.
6351 static int set_array_info(struct mddev *mddev, mdu_array_info_t *info)
6354 if (info->raid_disks == 0) {
6355 /* just setting version number for superblock loading */
6356 if (info->major_version < 0 ||
6357 info->major_version >= ARRAY_SIZE(super_types) ||
6358 super_types[info->major_version].name == NULL) {
6359 /* maybe try to auto-load a module? */
6360 pr_warn("md: superblock version %d not known\n",
6361 info->major_version);
6364 mddev->major_version = info->major_version;
6365 mddev->minor_version = info->minor_version;
6366 mddev->patch_version = info->patch_version;
6367 mddev->persistent = !info->not_persistent;
6368 /* ensure mddev_put doesn't delete this now that there
6369 * is some minimal configuration.
6371 mddev->ctime = ktime_get_real_seconds();
6374 mddev->major_version = MD_MAJOR_VERSION;
6375 mddev->minor_version = MD_MINOR_VERSION;
6376 mddev->patch_version = MD_PATCHLEVEL_VERSION;
6377 mddev->ctime = ktime_get_real_seconds();
6379 mddev->level = info->level;
6380 mddev->clevel[0] = 0;
6381 mddev->dev_sectors = 2 * (sector_t)info->size;
6382 mddev->raid_disks = info->raid_disks;
6383 /* don't set md_minor, it is determined by which /dev/md* was
6386 if (info->state & (1<<MD_SB_CLEAN))
6387 mddev->recovery_cp = MaxSector;
6389 mddev->recovery_cp = 0;
6390 mddev->persistent = ! info->not_persistent;
6391 mddev->external = 0;
6393 mddev->layout = info->layout;
6394 mddev->chunk_sectors = info->chunk_size >> 9;
6396 mddev->max_disks = MD_SB_DISKS;
6398 if (mddev->persistent)
6400 set_bit(MD_CHANGE_DEVS, &mddev->flags);
6402 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
6403 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
6404 mddev->bitmap_info.offset = 0;
6406 mddev->reshape_position = MaxSector;
6409 * Generate a 128 bit UUID
6411 get_random_bytes(mddev->uuid, 16);
6413 mddev->new_level = mddev->level;
6414 mddev->new_chunk_sectors = mddev->chunk_sectors;
6415 mddev->new_layout = mddev->layout;
6416 mddev->delta_disks = 0;
6417 mddev->reshape_backwards = 0;
6422 void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors)
6424 WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__);
6426 if (mddev->external_size)
6429 mddev->array_sectors = array_sectors;
6431 EXPORT_SYMBOL(md_set_array_sectors);
6433 static int update_size(struct mddev *mddev, sector_t num_sectors)
6435 struct md_rdev *rdev;
6437 int fit = (num_sectors == 0);
6439 /* cluster raid doesn't support update size */
6440 if (mddev_is_clustered(mddev))
6443 if (mddev->pers->resize == NULL)
6445 /* The "num_sectors" is the number of sectors of each device that
6446 * is used. This can only make sense for arrays with redundancy.
6447 * linear and raid0 always use whatever space is available. We can only
6448 * consider changing this number if no resync or reconstruction is
6449 * happening, and if the new size is acceptable. It must fit before the
6450 * sb_start or, if that is <data_offset, it must fit before the size
6451 * of each device. If num_sectors is zero, we find the largest size
6454 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
6460 rdev_for_each(rdev, mddev) {
6461 sector_t avail = rdev->sectors;
6463 if (fit && (num_sectors == 0 || num_sectors > avail))
6464 num_sectors = avail;
6465 if (avail < num_sectors)
6468 rv = mddev->pers->resize(mddev, num_sectors);
6470 revalidate_disk(mddev->gendisk);
6474 static int update_raid_disks(struct mddev *mddev, int raid_disks)
6477 struct md_rdev *rdev;
6478 /* change the number of raid disks */
6479 if (mddev->pers->check_reshape == NULL)
6483 if (raid_disks <= 0 ||
6484 (mddev->max_disks && raid_disks >= mddev->max_disks))
6486 if (mddev->sync_thread ||
6487 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
6488 mddev->reshape_position != MaxSector)
6491 rdev_for_each(rdev, mddev) {
6492 if (mddev->raid_disks < raid_disks &&
6493 rdev->data_offset < rdev->new_data_offset)
6495 if (mddev->raid_disks > raid_disks &&
6496 rdev->data_offset > rdev->new_data_offset)
6500 mddev->delta_disks = raid_disks - mddev->raid_disks;
6501 if (mddev->delta_disks < 0)
6502 mddev->reshape_backwards = 1;
6503 else if (mddev->delta_disks > 0)
6504 mddev->reshape_backwards = 0;
6506 rv = mddev->pers->check_reshape(mddev);
6508 mddev->delta_disks = 0;
6509 mddev->reshape_backwards = 0;
6515 * update_array_info is used to change the configuration of an
6517 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
6518 * fields in the info are checked against the array.
6519 * Any differences that cannot be handled will cause an error.
6520 * Normally, only one change can be managed at a time.
6522 static int update_array_info(struct mddev *mddev, mdu_array_info_t *info)
6528 /* calculate expected state,ignoring low bits */
6529 if (mddev->bitmap && mddev->bitmap_info.offset)
6530 state |= (1 << MD_SB_BITMAP_PRESENT);
6532 if (mddev->major_version != info->major_version ||
6533 mddev->minor_version != info->minor_version ||
6534 /* mddev->patch_version != info->patch_version || */
6535 mddev->ctime != info->ctime ||
6536 mddev->level != info->level ||
6537 /* mddev->layout != info->layout || */
6538 mddev->persistent != !info->not_persistent ||
6539 mddev->chunk_sectors != info->chunk_size >> 9 ||
6540 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
6541 ((state^info->state) & 0xfffffe00)
6544 /* Check there is only one change */
6545 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
6547 if (mddev->raid_disks != info->raid_disks)
6549 if (mddev->layout != info->layout)
6551 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT))
6558 if (mddev->layout != info->layout) {
6560 * we don't need to do anything at the md level, the
6561 * personality will take care of it all.
6563 if (mddev->pers->check_reshape == NULL)
6566 mddev->new_layout = info->layout;
6567 rv = mddev->pers->check_reshape(mddev);
6569 mddev->new_layout = mddev->layout;
6573 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
6574 rv = update_size(mddev, (sector_t)info->size * 2);
6576 if (mddev->raid_disks != info->raid_disks)
6577 rv = update_raid_disks(mddev, info->raid_disks);
6579 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
6580 if (mddev->pers->quiesce == NULL || mddev->thread == NULL) {
6584 if (mddev->recovery || mddev->sync_thread) {
6588 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
6589 struct bitmap *bitmap;
6590 /* add the bitmap */
6591 if (mddev->bitmap) {
6595 if (mddev->bitmap_info.default_offset == 0) {
6599 mddev->bitmap_info.offset =
6600 mddev->bitmap_info.default_offset;
6601 mddev->bitmap_info.space =
6602 mddev->bitmap_info.default_space;
6603 mddev->pers->quiesce(mddev, 1);
6604 bitmap = bitmap_create(mddev, -1);
6605 if (!IS_ERR(bitmap)) {
6606 mddev->bitmap = bitmap;
6607 rv = bitmap_load(mddev);
6609 rv = PTR_ERR(bitmap);
6611 bitmap_destroy(mddev);
6612 mddev->pers->quiesce(mddev, 0);
6614 /* remove the bitmap */
6615 if (!mddev->bitmap) {
6619 if (mddev->bitmap->storage.file) {
6623 if (mddev->bitmap_info.nodes) {
6624 /* hold PW on all the bitmap lock */
6625 if (md_cluster_ops->lock_all_bitmaps(mddev) <= 0) {
6626 pr_warn("md: can't change bitmap to none since the array is in use by more than one node\n");
6628 md_cluster_ops->unlock_all_bitmaps(mddev);
6632 mddev->bitmap_info.nodes = 0;
6633 md_cluster_ops->leave(mddev);
6635 mddev->pers->quiesce(mddev, 1);
6636 bitmap_destroy(mddev);
6637 mddev->pers->quiesce(mddev, 0);
6638 mddev->bitmap_info.offset = 0;
6641 md_update_sb(mddev, 1);
6647 static int set_disk_faulty(struct mddev *mddev, dev_t dev)
6649 struct md_rdev *rdev;
6652 if (mddev->pers == NULL)
6656 rdev = find_rdev_rcu(mddev, dev);
6660 md_error(mddev, rdev);
6661 if (!test_bit(Faulty, &rdev->flags))
6669 * We have a problem here : there is no easy way to give a CHS
6670 * virtual geometry. We currently pretend that we have a 2 heads
6671 * 4 sectors (with a BIG number of cylinders...). This drives
6672 * dosfs just mad... ;-)
6674 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
6676 struct mddev *mddev = bdev->bd_disk->private_data;
6680 geo->cylinders = mddev->array_sectors / 8;
6684 static inline bool md_ioctl_valid(unsigned int cmd)
6689 case GET_ARRAY_INFO:
6690 case GET_BITMAP_FILE:
6693 case HOT_REMOVE_DISK:
6696 case RESTART_ARRAY_RW:
6698 case SET_ARRAY_INFO:
6699 case SET_BITMAP_FILE:
6700 case SET_DISK_FAULTY:
6703 case CLUSTERED_DISK_NACK:
6710 static int md_ioctl(struct block_device *bdev, fmode_t mode,
6711 unsigned int cmd, unsigned long arg)
6714 void __user *argp = (void __user *)arg;
6715 struct mddev *mddev = NULL;
6718 if (!md_ioctl_valid(cmd))
6723 case GET_ARRAY_INFO:
6727 if (!capable(CAP_SYS_ADMIN))
6732 * Commands dealing with the RAID driver but not any
6737 err = get_version(argp);
6743 autostart_arrays(arg);
6750 * Commands creating/starting a new array:
6753 mddev = bdev->bd_disk->private_data;
6760 /* Some actions do not requires the mutex */
6762 case GET_ARRAY_INFO:
6763 if (!mddev->raid_disks && !mddev->external)
6766 err = get_array_info(mddev, argp);
6770 if (!mddev->raid_disks && !mddev->external)
6773 err = get_disk_info(mddev, argp);
6776 case SET_DISK_FAULTY:
6777 err = set_disk_faulty(mddev, new_decode_dev(arg));
6780 case GET_BITMAP_FILE:
6781 err = get_bitmap_file(mddev, argp);
6786 if (cmd == ADD_NEW_DISK)
6787 /* need to ensure md_delayed_delete() has completed */
6788 flush_workqueue(md_misc_wq);
6790 if (cmd == HOT_REMOVE_DISK)
6791 /* need to ensure recovery thread has run */
6792 wait_event_interruptible_timeout(mddev->sb_wait,
6793 !test_bit(MD_RECOVERY_NEEDED,
6795 msecs_to_jiffies(5000));
6796 if (cmd == STOP_ARRAY || cmd == STOP_ARRAY_RO) {
6797 /* Need to flush page cache, and ensure no-one else opens
6800 mutex_lock(&mddev->open_mutex);
6801 if (mddev->pers && atomic_read(&mddev->openers) > 1) {
6802 mutex_unlock(&mddev->open_mutex);
6806 set_bit(MD_CLOSING, &mddev->flags);
6807 mutex_unlock(&mddev->open_mutex);
6808 sync_blockdev(bdev);
6810 err = mddev_lock(mddev);
6812 pr_debug("md: ioctl lock interrupted, reason %d, cmd %d\n",
6817 if (cmd == SET_ARRAY_INFO) {
6818 mdu_array_info_t info;
6820 memset(&info, 0, sizeof(info));
6821 else if (copy_from_user(&info, argp, sizeof(info))) {
6826 err = update_array_info(mddev, &info);
6828 pr_warn("md: couldn't update array info. %d\n", err);
6833 if (!list_empty(&mddev->disks)) {
6834 pr_warn("md: array %s already has disks!\n", mdname(mddev));
6838 if (mddev->raid_disks) {
6839 pr_warn("md: array %s already initialised!\n", mdname(mddev));
6843 err = set_array_info(mddev, &info);
6845 pr_warn("md: couldn't set array info. %d\n", err);
6852 * Commands querying/configuring an existing array:
6854 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
6855 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
6856 if ((!mddev->raid_disks && !mddev->external)
6857 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
6858 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
6859 && cmd != GET_BITMAP_FILE) {
6865 * Commands even a read-only array can execute:
6868 case RESTART_ARRAY_RW:
6869 err = restart_array(mddev);
6873 err = do_md_stop(mddev, 0, bdev);
6877 err = md_set_readonly(mddev, bdev);
6880 case HOT_REMOVE_DISK:
6881 err = hot_remove_disk(mddev, new_decode_dev(arg));
6885 /* We can support ADD_NEW_DISK on read-only arrays
6886 * only if we are re-adding a preexisting device.
6887 * So require mddev->pers and MD_DISK_SYNC.
6890 mdu_disk_info_t info;
6891 if (copy_from_user(&info, argp, sizeof(info)))
6893 else if (!(info.state & (1<<MD_DISK_SYNC)))
6894 /* Need to clear read-only for this */
6897 err = add_new_disk(mddev, &info);
6903 if (get_user(ro, (int __user *)(arg))) {
6909 /* if the bdev is going readonly the value of mddev->ro
6910 * does not matter, no writes are coming
6915 /* are we are already prepared for writes? */
6919 /* transitioning to readauto need only happen for
6920 * arrays that call md_write_start
6923 err = restart_array(mddev);
6926 set_disk_ro(mddev->gendisk, 0);
6933 * The remaining ioctls are changing the state of the
6934 * superblock, so we do not allow them on read-only arrays.
6936 if (mddev->ro && mddev->pers) {
6937 if (mddev->ro == 2) {
6939 sysfs_notify_dirent_safe(mddev->sysfs_state);
6940 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6941 /* mddev_unlock will wake thread */
6942 /* If a device failed while we were read-only, we
6943 * need to make sure the metadata is updated now.
6945 if (test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
6946 mddev_unlock(mddev);
6947 wait_event(mddev->sb_wait,
6948 !test_bit(MD_CHANGE_DEVS, &mddev->flags) &&
6949 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
6950 mddev_lock_nointr(mddev);
6961 mdu_disk_info_t info;
6962 if (copy_from_user(&info, argp, sizeof(info)))
6965 err = add_new_disk(mddev, &info);
6969 case CLUSTERED_DISK_NACK:
6970 if (mddev_is_clustered(mddev))
6971 md_cluster_ops->new_disk_ack(mddev, false);
6977 err = hot_add_disk(mddev, new_decode_dev(arg));
6981 err = do_md_run(mddev);
6984 case SET_BITMAP_FILE:
6985 err = set_bitmap_file(mddev, (int)arg);
6994 if (mddev->hold_active == UNTIL_IOCTL &&
6996 mddev->hold_active = 0;
6997 mddev_unlock(mddev);
7001 #ifdef CONFIG_COMPAT
7002 static int md_compat_ioctl(struct block_device *bdev, fmode_t mode,
7003 unsigned int cmd, unsigned long arg)
7006 case HOT_REMOVE_DISK:
7008 case SET_DISK_FAULTY:
7009 case SET_BITMAP_FILE:
7010 /* These take in integer arg, do not convert */
7013 arg = (unsigned long)compat_ptr(arg);
7017 return md_ioctl(bdev, mode, cmd, arg);
7019 #endif /* CONFIG_COMPAT */
7021 static int md_open(struct block_device *bdev, fmode_t mode)
7024 * Succeed if we can lock the mddev, which confirms that
7025 * it isn't being stopped right now.
7027 struct mddev *mddev = mddev_find(bdev->bd_dev);
7033 if (mddev->gendisk != bdev->bd_disk) {
7034 /* we are racing with mddev_put which is discarding this
7038 /* Wait until bdev->bd_disk is definitely gone */
7039 flush_workqueue(md_misc_wq);
7040 /* Then retry the open from the top */
7041 return -ERESTARTSYS;
7043 BUG_ON(mddev != bdev->bd_disk->private_data);
7045 if ((err = mutex_lock_interruptible(&mddev->open_mutex)))
7048 if (test_bit(MD_CLOSING, &mddev->flags)) {
7049 mutex_unlock(&mddev->open_mutex);
7054 atomic_inc(&mddev->openers);
7055 mutex_unlock(&mddev->open_mutex);
7057 check_disk_change(bdev);
7062 static void md_release(struct gendisk *disk, fmode_t mode)
7064 struct mddev *mddev = disk->private_data;
7067 atomic_dec(&mddev->openers);
7071 static int md_media_changed(struct gendisk *disk)
7073 struct mddev *mddev = disk->private_data;
7075 return mddev->changed;
7078 static int md_revalidate(struct gendisk *disk)
7080 struct mddev *mddev = disk->private_data;
7085 static const struct block_device_operations md_fops =
7087 .owner = THIS_MODULE,
7089 .release = md_release,
7091 #ifdef CONFIG_COMPAT
7092 .compat_ioctl = md_compat_ioctl,
7094 .getgeo = md_getgeo,
7095 .media_changed = md_media_changed,
7096 .revalidate_disk= md_revalidate,
7099 static int md_thread(void *arg)
7101 struct md_thread *thread = arg;
7104 * md_thread is a 'system-thread', it's priority should be very
7105 * high. We avoid resource deadlocks individually in each
7106 * raid personality. (RAID5 does preallocation) We also use RR and
7107 * the very same RT priority as kswapd, thus we will never get
7108 * into a priority inversion deadlock.
7110 * we definitely have to have equal or higher priority than
7111 * bdflush, otherwise bdflush will deadlock if there are too
7112 * many dirty RAID5 blocks.
7115 allow_signal(SIGKILL);
7116 while (!kthread_should_stop()) {
7118 /* We need to wait INTERRUPTIBLE so that
7119 * we don't add to the load-average.
7120 * That means we need to be sure no signals are
7123 if (signal_pending(current))
7124 flush_signals(current);
7126 wait_event_interruptible_timeout
7128 test_bit(THREAD_WAKEUP, &thread->flags)
7129 || kthread_should_stop(),
7132 clear_bit(THREAD_WAKEUP, &thread->flags);
7133 if (!kthread_should_stop())
7134 thread->run(thread);
7140 void md_wakeup_thread(struct md_thread *thread)
7143 pr_debug("md: waking up MD thread %s.\n", thread->tsk->comm);
7144 set_bit(THREAD_WAKEUP, &thread->flags);
7145 wake_up(&thread->wqueue);
7148 EXPORT_SYMBOL(md_wakeup_thread);
7150 struct md_thread *md_register_thread(void (*run) (struct md_thread *),
7151 struct mddev *mddev, const char *name)
7153 struct md_thread *thread;
7155 thread = kzalloc(sizeof(struct md_thread), GFP_KERNEL);
7159 init_waitqueue_head(&thread->wqueue);
7162 thread->mddev = mddev;
7163 thread->timeout = MAX_SCHEDULE_TIMEOUT;
7164 thread->tsk = kthread_run(md_thread, thread,
7166 mdname(thread->mddev),
7168 if (IS_ERR(thread->tsk)) {
7174 EXPORT_SYMBOL(md_register_thread);
7176 void md_unregister_thread(struct md_thread **threadp)
7178 struct md_thread *thread = *threadp;
7181 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
7182 /* Locking ensures that mddev_unlock does not wake_up a
7183 * non-existent thread
7185 spin_lock(&pers_lock);
7187 spin_unlock(&pers_lock);
7189 kthread_stop(thread->tsk);
7192 EXPORT_SYMBOL(md_unregister_thread);
7194 void md_error(struct mddev *mddev, struct md_rdev *rdev)
7196 if (!rdev || test_bit(Faulty, &rdev->flags))
7199 if (!mddev->pers || !mddev->pers->error_handler)
7201 mddev->pers->error_handler(mddev,rdev);
7202 if (mddev->degraded)
7203 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7204 sysfs_notify_dirent_safe(rdev->sysfs_state);
7205 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7206 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7207 md_wakeup_thread(mddev->thread);
7208 if (mddev->event_work.func)
7209 queue_work(md_misc_wq, &mddev->event_work);
7210 md_new_event(mddev);
7212 EXPORT_SYMBOL(md_error);
7214 /* seq_file implementation /proc/mdstat */
7216 static void status_unused(struct seq_file *seq)
7219 struct md_rdev *rdev;
7221 seq_printf(seq, "unused devices: ");
7223 list_for_each_entry(rdev, &pending_raid_disks, same_set) {
7224 char b[BDEVNAME_SIZE];
7226 seq_printf(seq, "%s ",
7227 bdevname(rdev->bdev,b));
7230 seq_printf(seq, "<none>");
7232 seq_printf(seq, "\n");
7235 static int status_resync(struct seq_file *seq, struct mddev *mddev)
7237 sector_t max_sectors, resync, res;
7238 unsigned long dt, db;
7241 unsigned int per_milli;
7243 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
7244 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
7245 max_sectors = mddev->resync_max_sectors;
7247 max_sectors = mddev->dev_sectors;
7249 resync = mddev->curr_resync;
7251 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
7252 /* Still cleaning up */
7253 resync = max_sectors;
7255 resync -= atomic_read(&mddev->recovery_active);
7258 if (mddev->recovery_cp < MaxSector) {
7259 seq_printf(seq, "\tresync=PENDING");
7265 seq_printf(seq, "\tresync=DELAYED");
7269 WARN_ON(max_sectors == 0);
7270 /* Pick 'scale' such that (resync>>scale)*1000 will fit
7271 * in a sector_t, and (max_sectors>>scale) will fit in a
7272 * u32, as those are the requirements for sector_div.
7273 * Thus 'scale' must be at least 10
7276 if (sizeof(sector_t) > sizeof(unsigned long)) {
7277 while ( max_sectors/2 > (1ULL<<(scale+32)))
7280 res = (resync>>scale)*1000;
7281 sector_div(res, (u32)((max_sectors>>scale)+1));
7285 int i, x = per_milli/50, y = 20-x;
7286 seq_printf(seq, "[");
7287 for (i = 0; i < x; i++)
7288 seq_printf(seq, "=");
7289 seq_printf(seq, ">");
7290 for (i = 0; i < y; i++)
7291 seq_printf(seq, ".");
7292 seq_printf(seq, "] ");
7294 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
7295 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
7297 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
7299 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
7300 "resync" : "recovery"))),
7301 per_milli/10, per_milli % 10,
7302 (unsigned long long) resync/2,
7303 (unsigned long long) max_sectors/2);
7306 * dt: time from mark until now
7307 * db: blocks written from mark until now
7308 * rt: remaining time
7310 * rt is a sector_t, so could be 32bit or 64bit.
7311 * So we divide before multiply in case it is 32bit and close
7313 * We scale the divisor (db) by 32 to avoid losing precision
7314 * near the end of resync when the number of remaining sectors
7316 * We then divide rt by 32 after multiplying by db to compensate.
7317 * The '+1' avoids division by zero if db is very small.
7319 dt = ((jiffies - mddev->resync_mark) / HZ);
7321 db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active))
7322 - mddev->resync_mark_cnt;
7324 rt = max_sectors - resync; /* number of remaining sectors */
7325 sector_div(rt, db/32+1);
7329 seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60,
7330 ((unsigned long)rt % 60)/6);
7332 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
7336 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
7338 struct list_head *tmp;
7340 struct mddev *mddev;
7348 spin_lock(&all_mddevs_lock);
7349 list_for_each(tmp,&all_mddevs)
7351 mddev = list_entry(tmp, struct mddev, all_mddevs);
7353 spin_unlock(&all_mddevs_lock);
7356 spin_unlock(&all_mddevs_lock);
7358 return (void*)2;/* tail */
7362 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
7364 struct list_head *tmp;
7365 struct mddev *next_mddev, *mddev = v;
7371 spin_lock(&all_mddevs_lock);
7373 tmp = all_mddevs.next;
7375 tmp = mddev->all_mddevs.next;
7376 if (tmp != &all_mddevs)
7377 next_mddev = mddev_get(list_entry(tmp,struct mddev,all_mddevs));
7379 next_mddev = (void*)2;
7382 spin_unlock(&all_mddevs_lock);
7390 static void md_seq_stop(struct seq_file *seq, void *v)
7392 struct mddev *mddev = v;
7394 if (mddev && v != (void*)1 && v != (void*)2)
7398 static int md_seq_show(struct seq_file *seq, void *v)
7400 struct mddev *mddev = v;
7402 struct md_rdev *rdev;
7404 if (v == (void*)1) {
7405 struct md_personality *pers;
7406 seq_printf(seq, "Personalities : ");
7407 spin_lock(&pers_lock);
7408 list_for_each_entry(pers, &pers_list, list)
7409 seq_printf(seq, "[%s] ", pers->name);
7411 spin_unlock(&pers_lock);
7412 seq_printf(seq, "\n");
7413 seq->poll_event = atomic_read(&md_event_count);
7416 if (v == (void*)2) {
7421 spin_lock(&mddev->lock);
7422 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
7423 seq_printf(seq, "%s : %sactive", mdname(mddev),
7424 mddev->pers ? "" : "in");
7427 seq_printf(seq, " (read-only)");
7429 seq_printf(seq, " (auto-read-only)");
7430 seq_printf(seq, " %s", mddev->pers->name);
7435 rdev_for_each_rcu(rdev, mddev) {
7436 char b[BDEVNAME_SIZE];
7437 seq_printf(seq, " %s[%d]",
7438 bdevname(rdev->bdev,b), rdev->desc_nr);
7439 if (test_bit(WriteMostly, &rdev->flags))
7440 seq_printf(seq, "(W)");
7441 if (test_bit(Journal, &rdev->flags))
7442 seq_printf(seq, "(J)");
7443 if (test_bit(Faulty, &rdev->flags)) {
7444 seq_printf(seq, "(F)");
7447 if (rdev->raid_disk < 0)
7448 seq_printf(seq, "(S)"); /* spare */
7449 if (test_bit(Replacement, &rdev->flags))
7450 seq_printf(seq, "(R)");
7451 sectors += rdev->sectors;
7455 if (!list_empty(&mddev->disks)) {
7457 seq_printf(seq, "\n %llu blocks",
7458 (unsigned long long)
7459 mddev->array_sectors / 2);
7461 seq_printf(seq, "\n %llu blocks",
7462 (unsigned long long)sectors / 2);
7464 if (mddev->persistent) {
7465 if (mddev->major_version != 0 ||
7466 mddev->minor_version != 90) {
7467 seq_printf(seq," super %d.%d",
7468 mddev->major_version,
7469 mddev->minor_version);
7471 } else if (mddev->external)
7472 seq_printf(seq, " super external:%s",
7473 mddev->metadata_type);
7475 seq_printf(seq, " super non-persistent");
7478 mddev->pers->status(seq, mddev);
7479 seq_printf(seq, "\n ");
7480 if (mddev->pers->sync_request) {
7481 if (status_resync(seq, mddev))
7482 seq_printf(seq, "\n ");
7485 seq_printf(seq, "\n ");
7487 bitmap_status(seq, mddev->bitmap);
7489 seq_printf(seq, "\n");
7491 spin_unlock(&mddev->lock);
7496 static const struct seq_operations md_seq_ops = {
7497 .start = md_seq_start,
7498 .next = md_seq_next,
7499 .stop = md_seq_stop,
7500 .show = md_seq_show,
7503 static int md_seq_open(struct inode *inode, struct file *file)
7505 struct seq_file *seq;
7508 error = seq_open(file, &md_seq_ops);
7512 seq = file->private_data;
7513 seq->poll_event = atomic_read(&md_event_count);
7517 static int md_unloading;
7518 static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
7520 struct seq_file *seq = filp->private_data;
7524 return POLLIN|POLLRDNORM|POLLERR|POLLPRI;
7525 poll_wait(filp, &md_event_waiters, wait);
7527 /* always allow read */
7528 mask = POLLIN | POLLRDNORM;
7530 if (seq->poll_event != atomic_read(&md_event_count))
7531 mask |= POLLERR | POLLPRI;
7535 static const struct file_operations md_seq_fops = {
7536 .owner = THIS_MODULE,
7537 .open = md_seq_open,
7539 .llseek = seq_lseek,
7540 .release = seq_release_private,
7541 .poll = mdstat_poll,
7544 int register_md_personality(struct md_personality *p)
7546 pr_debug("md: %s personality registered for level %d\n",
7548 spin_lock(&pers_lock);
7549 list_add_tail(&p->list, &pers_list);
7550 spin_unlock(&pers_lock);
7553 EXPORT_SYMBOL(register_md_personality);
7555 int unregister_md_personality(struct md_personality *p)
7557 pr_debug("md: %s personality unregistered\n", p->name);
7558 spin_lock(&pers_lock);
7559 list_del_init(&p->list);
7560 spin_unlock(&pers_lock);
7563 EXPORT_SYMBOL(unregister_md_personality);
7565 int register_md_cluster_operations(struct md_cluster_operations *ops,
7566 struct module *module)
7569 spin_lock(&pers_lock);
7570 if (md_cluster_ops != NULL)
7573 md_cluster_ops = ops;
7574 md_cluster_mod = module;
7576 spin_unlock(&pers_lock);
7579 EXPORT_SYMBOL(register_md_cluster_operations);
7581 int unregister_md_cluster_operations(void)
7583 spin_lock(&pers_lock);
7584 md_cluster_ops = NULL;
7585 spin_unlock(&pers_lock);
7588 EXPORT_SYMBOL(unregister_md_cluster_operations);
7590 int md_setup_cluster(struct mddev *mddev, int nodes)
7592 if (!md_cluster_ops)
7593 request_module("md-cluster");
7594 spin_lock(&pers_lock);
7595 /* ensure module won't be unloaded */
7596 if (!md_cluster_ops || !try_module_get(md_cluster_mod)) {
7597 pr_warn("can't find md-cluster module or get it's reference.\n");
7598 spin_unlock(&pers_lock);
7601 spin_unlock(&pers_lock);
7603 return md_cluster_ops->join(mddev, nodes);
7606 void md_cluster_stop(struct mddev *mddev)
7608 if (!md_cluster_ops)
7610 md_cluster_ops->leave(mddev);
7611 module_put(md_cluster_mod);
7614 static int is_mddev_idle(struct mddev *mddev, int init)
7616 struct md_rdev *rdev;
7622 rdev_for_each_rcu(rdev, mddev) {
7623 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
7624 curr_events = (int)part_stat_read(&disk->part0, sectors[0]) +
7625 (int)part_stat_read(&disk->part0, sectors[1]) -
7626 atomic_read(&disk->sync_io);
7627 /* sync IO will cause sync_io to increase before the disk_stats
7628 * as sync_io is counted when a request starts, and
7629 * disk_stats is counted when it completes.
7630 * So resync activity will cause curr_events to be smaller than
7631 * when there was no such activity.
7632 * non-sync IO will cause disk_stat to increase without
7633 * increasing sync_io so curr_events will (eventually)
7634 * be larger than it was before. Once it becomes
7635 * substantially larger, the test below will cause
7636 * the array to appear non-idle, and resync will slow
7638 * If there is a lot of outstanding resync activity when
7639 * we set last_event to curr_events, then all that activity
7640 * completing might cause the array to appear non-idle
7641 * and resync will be slowed down even though there might
7642 * not have been non-resync activity. This will only
7643 * happen once though. 'last_events' will soon reflect
7644 * the state where there is little or no outstanding
7645 * resync requests, and further resync activity will
7646 * always make curr_events less than last_events.
7649 if (init || curr_events - rdev->last_events > 64) {
7650 rdev->last_events = curr_events;
7658 void md_done_sync(struct mddev *mddev, int blocks, int ok)
7660 /* another "blocks" (512byte) blocks have been synced */
7661 atomic_sub(blocks, &mddev->recovery_active);
7662 wake_up(&mddev->recovery_wait);
7664 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7665 set_bit(MD_RECOVERY_ERROR, &mddev->recovery);
7666 md_wakeup_thread(mddev->thread);
7667 // stop recovery, signal do_sync ....
7670 EXPORT_SYMBOL(md_done_sync);
7672 /* md_write_start(mddev, bi)
7673 * If we need to update some array metadata (e.g. 'active' flag
7674 * in superblock) before writing, schedule a superblock update
7675 * and wait for it to complete.
7677 void md_write_start(struct mddev *mddev, struct bio *bi)
7680 if (bio_data_dir(bi) != WRITE)
7683 BUG_ON(mddev->ro == 1);
7684 if (mddev->ro == 2) {
7685 /* need to switch to read/write */
7687 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7688 md_wakeup_thread(mddev->thread);
7689 md_wakeup_thread(mddev->sync_thread);
7692 atomic_inc(&mddev->writes_pending);
7693 if (mddev->safemode == 1)
7694 mddev->safemode = 0;
7695 if (mddev->in_sync) {
7696 spin_lock(&mddev->lock);
7697 if (mddev->in_sync) {
7699 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
7700 set_bit(MD_CHANGE_PENDING, &mddev->flags);
7701 md_wakeup_thread(mddev->thread);
7704 spin_unlock(&mddev->lock);
7707 sysfs_notify_dirent_safe(mddev->sysfs_state);
7708 wait_event(mddev->sb_wait,
7709 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
7711 EXPORT_SYMBOL(md_write_start);
7713 void md_write_end(struct mddev *mddev)
7715 if (atomic_dec_and_test(&mddev->writes_pending)) {
7716 if (mddev->safemode == 2)
7717 md_wakeup_thread(mddev->thread);
7718 else if (mddev->safemode_delay)
7719 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
7722 EXPORT_SYMBOL(md_write_end);
7724 /* md_allow_write(mddev)
7725 * Calling this ensures that the array is marked 'active' so that writes
7726 * may proceed without blocking. It is important to call this before
7727 * attempting a GFP_KERNEL allocation while holding the mddev lock.
7728 * Must be called with mddev_lock held.
7730 * In the ->external case MD_CHANGE_PENDING can not be cleared until mddev->lock
7731 * is dropped, so return -EAGAIN after notifying userspace.
7733 int md_allow_write(struct mddev *mddev)
7739 if (!mddev->pers->sync_request)
7742 spin_lock(&mddev->lock);
7743 if (mddev->in_sync) {
7745 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
7746 set_bit(MD_CHANGE_PENDING, &mddev->flags);
7747 if (mddev->safemode_delay &&
7748 mddev->safemode == 0)
7749 mddev->safemode = 1;
7750 spin_unlock(&mddev->lock);
7751 md_update_sb(mddev, 0);
7752 sysfs_notify_dirent_safe(mddev->sysfs_state);
7754 spin_unlock(&mddev->lock);
7756 if (test_bit(MD_CHANGE_PENDING, &mddev->flags))
7761 EXPORT_SYMBOL_GPL(md_allow_write);
7763 #define SYNC_MARKS 10
7764 #define SYNC_MARK_STEP (3*HZ)
7765 #define UPDATE_FREQUENCY (5*60*HZ)
7766 void md_do_sync(struct md_thread *thread)
7768 struct mddev *mddev = thread->mddev;
7769 struct mddev *mddev2;
7770 unsigned int currspeed = 0,
7772 sector_t max_sectors,j, io_sectors, recovery_done;
7773 unsigned long mark[SYNC_MARKS];
7774 unsigned long update_time;
7775 sector_t mark_cnt[SYNC_MARKS];
7777 struct list_head *tmp;
7778 sector_t last_check;
7780 struct md_rdev *rdev;
7781 char *desc, *action = NULL;
7782 struct blk_plug plug;
7785 /* just incase thread restarts... */
7786 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
7788 if (mddev->ro) {/* never try to sync a read-only array */
7789 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7793 if (mddev_is_clustered(mddev)) {
7794 ret = md_cluster_ops->resync_start(mddev);
7798 set_bit(MD_CLUSTER_RESYNC_LOCKED, &mddev->flags);
7799 if (!(test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
7800 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) ||
7801 test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
7802 && ((unsigned long long)mddev->curr_resync_completed
7803 < (unsigned long long)mddev->resync_max_sectors))
7807 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
7808 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) {
7809 desc = "data-check";
7811 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
7812 desc = "requested-resync";
7816 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
7821 mddev->last_sync_action = action ?: desc;
7823 /* we overload curr_resync somewhat here.
7824 * 0 == not engaged in resync at all
7825 * 2 == checking that there is no conflict with another sync
7826 * 1 == like 2, but have yielded to allow conflicting resync to
7828 * other == active in resync - this many blocks
7830 * Before starting a resync we must have set curr_resync to
7831 * 2, and then checked that every "conflicting" array has curr_resync
7832 * less than ours. When we find one that is the same or higher
7833 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
7834 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
7835 * This will mean we have to start checking from the beginning again.
7840 int mddev2_minor = -1;
7841 mddev->curr_resync = 2;
7844 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
7846 for_each_mddev(mddev2, tmp) {
7847 if (mddev2 == mddev)
7849 if (!mddev->parallel_resync
7850 && mddev2->curr_resync
7851 && match_mddev_units(mddev, mddev2)) {
7853 if (mddev < mddev2 && mddev->curr_resync == 2) {
7854 /* arbitrarily yield */
7855 mddev->curr_resync = 1;
7856 wake_up(&resync_wait);
7858 if (mddev > mddev2 && mddev->curr_resync == 1)
7859 /* no need to wait here, we can wait the next
7860 * time 'round when curr_resync == 2
7863 /* We need to wait 'interruptible' so as not to
7864 * contribute to the load average, and not to
7865 * be caught by 'softlockup'
7867 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
7868 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
7869 mddev2->curr_resync >= mddev->curr_resync) {
7870 if (mddev2_minor != mddev2->md_minor) {
7871 mddev2_minor = mddev2->md_minor;
7872 pr_info("md: delaying %s of %s until %s has finished (they share one or more physical units)\n",
7873 desc, mdname(mddev),
7877 if (signal_pending(current))
7878 flush_signals(current);
7880 finish_wait(&resync_wait, &wq);
7883 finish_wait(&resync_wait, &wq);
7886 } while (mddev->curr_resync < 2);
7889 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
7890 /* resync follows the size requested by the personality,
7891 * which defaults to physical size, but can be virtual size
7893 max_sectors = mddev->resync_max_sectors;
7894 atomic64_set(&mddev->resync_mismatches, 0);
7895 /* we don't use the checkpoint if there's a bitmap */
7896 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
7897 j = mddev->resync_min;
7898 else if (!mddev->bitmap)
7899 j = mddev->recovery_cp;
7901 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
7902 max_sectors = mddev->resync_max_sectors;
7904 /* recovery follows the physical size of devices */
7905 max_sectors = mddev->dev_sectors;
7908 rdev_for_each_rcu(rdev, mddev)
7909 if (rdev->raid_disk >= 0 &&
7910 !test_bit(Journal, &rdev->flags) &&
7911 !test_bit(Faulty, &rdev->flags) &&
7912 !test_bit(In_sync, &rdev->flags) &&
7913 rdev->recovery_offset < j)
7914 j = rdev->recovery_offset;
7917 /* If there is a bitmap, we need to make sure all
7918 * writes that started before we added a spare
7919 * complete before we start doing a recovery.
7920 * Otherwise the write might complete and (via
7921 * bitmap_endwrite) set a bit in the bitmap after the
7922 * recovery has checked that bit and skipped that
7925 if (mddev->bitmap) {
7926 mddev->pers->quiesce(mddev, 1);
7927 mddev->pers->quiesce(mddev, 0);
7931 pr_info("md: %s of RAID array %s\n", desc, mdname(mddev));
7932 pr_debug("md: minimum _guaranteed_ speed: %d KB/sec/disk.\n", speed_min(mddev));
7933 pr_debug("md: using maximum available idle IO bandwidth (but not more than %d KB/sec) for %s.\n",
7934 speed_max(mddev), desc);
7936 is_mddev_idle(mddev, 1); /* this initializes IO event counters */
7939 for (m = 0; m < SYNC_MARKS; m++) {
7941 mark_cnt[m] = io_sectors;
7944 mddev->resync_mark = mark[last_mark];
7945 mddev->resync_mark_cnt = mark_cnt[last_mark];
7948 * Tune reconstruction:
7950 window = 32*(PAGE_SIZE/512);
7951 pr_debug("md: using %dk window, over a total of %lluk.\n",
7952 window/2, (unsigned long long)max_sectors/2);
7954 atomic_set(&mddev->recovery_active, 0);
7958 pr_debug("md: resuming %s of %s from checkpoint.\n",
7959 desc, mdname(mddev));
7960 mddev->curr_resync = j;
7962 mddev->curr_resync = 3; /* no longer delayed */
7963 mddev->curr_resync_completed = j;
7964 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
7965 md_new_event(mddev);
7966 update_time = jiffies;
7968 blk_start_plug(&plug);
7969 while (j < max_sectors) {
7974 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
7975 ((mddev->curr_resync > mddev->curr_resync_completed &&
7976 (mddev->curr_resync - mddev->curr_resync_completed)
7977 > (max_sectors >> 4)) ||
7978 time_after_eq(jiffies, update_time + UPDATE_FREQUENCY) ||
7979 (j - mddev->curr_resync_completed)*2
7980 >= mddev->resync_max - mddev->curr_resync_completed ||
7981 mddev->curr_resync_completed > mddev->resync_max
7983 /* time to update curr_resync_completed */
7984 wait_event(mddev->recovery_wait,
7985 atomic_read(&mddev->recovery_active) == 0);
7986 mddev->curr_resync_completed = j;
7987 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) &&
7988 j > mddev->recovery_cp)
7989 mddev->recovery_cp = j;
7990 update_time = jiffies;
7991 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
7992 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
7995 while (j >= mddev->resync_max &&
7996 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
7997 /* As this condition is controlled by user-space,
7998 * we can block indefinitely, so use '_interruptible'
7999 * to avoid triggering warnings.
8001 flush_signals(current); /* just in case */
8002 wait_event_interruptible(mddev->recovery_wait,
8003 mddev->resync_max > j
8004 || test_bit(MD_RECOVERY_INTR,
8008 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8011 sectors = mddev->pers->sync_request(mddev, j, &skipped);
8013 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8017 if (!skipped) { /* actual IO requested */
8018 io_sectors += sectors;
8019 atomic_add(sectors, &mddev->recovery_active);
8022 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8026 if (j > max_sectors)
8027 /* when skipping, extra large numbers can be returned. */
8030 mddev->curr_resync = j;
8031 mddev->curr_mark_cnt = io_sectors;
8032 if (last_check == 0)
8033 /* this is the earliest that rebuild will be
8034 * visible in /proc/mdstat
8036 md_new_event(mddev);
8038 if (last_check + window > io_sectors || j == max_sectors)
8041 last_check = io_sectors;
8043 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
8045 int next = (last_mark+1) % SYNC_MARKS;
8047 mddev->resync_mark = mark[next];
8048 mddev->resync_mark_cnt = mark_cnt[next];
8049 mark[next] = jiffies;
8050 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
8054 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8058 * this loop exits only if either when we are slower than
8059 * the 'hard' speed limit, or the system was IO-idle for
8061 * the system might be non-idle CPU-wise, but we only care
8062 * about not overloading the IO subsystem. (things like an
8063 * e2fsck being done on the RAID array should execute fast)
8067 recovery_done = io_sectors - atomic_read(&mddev->recovery_active);
8068 currspeed = ((unsigned long)(recovery_done - mddev->resync_mark_cnt))/2
8069 /((jiffies-mddev->resync_mark)/HZ +1) +1;
8071 if (currspeed > speed_min(mddev)) {
8072 if (currspeed > speed_max(mddev)) {
8076 if (!is_mddev_idle(mddev, 0)) {
8078 * Give other IO more of a chance.
8079 * The faster the devices, the less we wait.
8081 wait_event(mddev->recovery_wait,
8082 !atomic_read(&mddev->recovery_active));
8086 pr_info("md: %s: %s %s.\n",mdname(mddev), desc,
8087 test_bit(MD_RECOVERY_INTR, &mddev->recovery)
8088 ? "interrupted" : "done");
8090 * this also signals 'finished resyncing' to md_stop
8092 blk_finish_plug(&plug);
8093 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
8095 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8096 !test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8097 mddev->curr_resync > 3) {
8098 mddev->curr_resync_completed = mddev->curr_resync;
8099 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
8101 mddev->pers->sync_request(mddev, max_sectors, &skipped);
8103 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
8104 mddev->curr_resync > 3) {
8105 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
8106 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
8107 if (mddev->curr_resync >= mddev->recovery_cp) {
8108 pr_debug("md: checkpointing %s of %s.\n",
8109 desc, mdname(mddev));
8110 if (test_bit(MD_RECOVERY_ERROR,
8112 mddev->recovery_cp =
8113 mddev->curr_resync_completed;
8115 mddev->recovery_cp =
8119 mddev->recovery_cp = MaxSector;
8121 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8122 mddev->curr_resync = MaxSector;
8124 rdev_for_each_rcu(rdev, mddev)
8125 if (rdev->raid_disk >= 0 &&
8126 mddev->delta_disks >= 0 &&
8127 !test_bit(Journal, &rdev->flags) &&
8128 !test_bit(Faulty, &rdev->flags) &&
8129 !test_bit(In_sync, &rdev->flags) &&
8130 rdev->recovery_offset < mddev->curr_resync)
8131 rdev->recovery_offset = mddev->curr_resync;
8136 /* set CHANGE_PENDING here since maybe another update is needed,
8137 * so other nodes are informed. It should be harmless for normal
8139 set_mask_bits(&mddev->flags, 0,
8140 BIT(MD_CHANGE_PENDING) | BIT(MD_CHANGE_DEVS));
8142 spin_lock(&mddev->lock);
8143 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
8144 /* We completed so min/max setting can be forgotten if used. */
8145 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
8146 mddev->resync_min = 0;
8147 mddev->resync_max = MaxSector;
8148 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
8149 mddev->resync_min = mddev->curr_resync_completed;
8150 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
8151 mddev->curr_resync = 0;
8152 spin_unlock(&mddev->lock);
8154 wake_up(&resync_wait);
8155 md_wakeup_thread(mddev->thread);
8158 EXPORT_SYMBOL_GPL(md_do_sync);
8160 static int remove_and_add_spares(struct mddev *mddev,
8161 struct md_rdev *this)
8163 struct md_rdev *rdev;
8166 bool remove_some = false;
8168 rdev_for_each(rdev, mddev) {
8169 if ((this == NULL || rdev == this) &&
8170 rdev->raid_disk >= 0 &&
8171 !test_bit(Blocked, &rdev->flags) &&
8172 test_bit(Faulty, &rdev->flags) &&
8173 atomic_read(&rdev->nr_pending)==0) {
8174 /* Faulty non-Blocked devices with nr_pending == 0
8175 * never get nr_pending incremented,
8176 * never get Faulty cleared, and never get Blocked set.
8177 * So we can synchronize_rcu now rather than once per device
8180 set_bit(RemoveSynchronized, &rdev->flags);
8186 rdev_for_each(rdev, mddev) {
8187 if ((this == NULL || rdev == this) &&
8188 rdev->raid_disk >= 0 &&
8189 !test_bit(Blocked, &rdev->flags) &&
8190 ((test_bit(RemoveSynchronized, &rdev->flags) ||
8191 (!test_bit(In_sync, &rdev->flags) &&
8192 !test_bit(Journal, &rdev->flags))) &&
8193 atomic_read(&rdev->nr_pending)==0)) {
8194 if (mddev->pers->hot_remove_disk(
8195 mddev, rdev) == 0) {
8196 sysfs_unlink_rdev(mddev, rdev);
8197 rdev->raid_disk = -1;
8201 if (remove_some && test_bit(RemoveSynchronized, &rdev->flags))
8202 clear_bit(RemoveSynchronized, &rdev->flags);
8205 if (removed && mddev->kobj.sd)
8206 sysfs_notify(&mddev->kobj, NULL, "degraded");
8208 if (this && removed)
8211 rdev_for_each(rdev, mddev) {
8212 if (this && this != rdev)
8214 if (test_bit(Candidate, &rdev->flags))
8216 if (rdev->raid_disk >= 0 &&
8217 !test_bit(In_sync, &rdev->flags) &&
8218 !test_bit(Journal, &rdev->flags) &&
8219 !test_bit(Faulty, &rdev->flags))
8221 if (rdev->raid_disk >= 0)
8223 if (test_bit(Faulty, &rdev->flags))
8225 if (!test_bit(Journal, &rdev->flags)) {
8227 ! (rdev->saved_raid_disk >= 0 &&
8228 !test_bit(Bitmap_sync, &rdev->flags)))
8231 rdev->recovery_offset = 0;
8234 hot_add_disk(mddev, rdev) == 0) {
8235 if (sysfs_link_rdev(mddev, rdev))
8236 /* failure here is OK */;
8237 if (!test_bit(Journal, &rdev->flags))
8239 md_new_event(mddev);
8240 set_bit(MD_CHANGE_DEVS, &mddev->flags);
8245 set_bit(MD_CHANGE_DEVS, &mddev->flags);
8249 static void md_start_sync(struct work_struct *ws)
8251 struct mddev *mddev = container_of(ws, struct mddev, del_work);
8253 mddev->sync_thread = md_register_thread(md_do_sync,
8256 if (!mddev->sync_thread) {
8257 pr_warn("%s: could not start resync thread...\n",
8259 /* leave the spares where they are, it shouldn't hurt */
8260 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8261 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
8262 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
8263 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
8264 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
8265 wake_up(&resync_wait);
8266 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
8268 if (mddev->sysfs_action)
8269 sysfs_notify_dirent_safe(mddev->sysfs_action);
8271 md_wakeup_thread(mddev->sync_thread);
8272 sysfs_notify_dirent_safe(mddev->sysfs_action);
8273 md_new_event(mddev);
8277 * This routine is regularly called by all per-raid-array threads to
8278 * deal with generic issues like resync and super-block update.
8279 * Raid personalities that don't have a thread (linear/raid0) do not
8280 * need this as they never do any recovery or update the superblock.
8282 * It does not do any resync itself, but rather "forks" off other threads
8283 * to do that as needed.
8284 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
8285 * "->recovery" and create a thread at ->sync_thread.
8286 * When the thread finishes it sets MD_RECOVERY_DONE
8287 * and wakeups up this thread which will reap the thread and finish up.
8288 * This thread also removes any faulty devices (with nr_pending == 0).
8290 * The overall approach is:
8291 * 1/ if the superblock needs updating, update it.
8292 * 2/ If a recovery thread is running, don't do anything else.
8293 * 3/ If recovery has finished, clean up, possibly marking spares active.
8294 * 4/ If there are any faulty devices, remove them.
8295 * 5/ If array is degraded, try to add spares devices
8296 * 6/ If array has spares or is not in-sync, start a resync thread.
8298 void md_check_recovery(struct mddev *mddev)
8300 if (mddev->suspended)
8304 bitmap_daemon_work(mddev);
8306 if (signal_pending(current)) {
8307 if (mddev->pers->sync_request && !mddev->external) {
8308 pr_debug("md: %s in immediate safe mode\n",
8310 mddev->safemode = 2;
8312 flush_signals(current);
8315 if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
8318 (mddev->flags & MD_UPDATE_SB_FLAGS & ~ (1<<MD_CHANGE_PENDING)) ||
8319 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
8320 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
8321 test_bit(MD_RELOAD_SB, &mddev->flags) ||
8322 (mddev->external == 0 && mddev->safemode == 1) ||
8323 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
8324 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
8328 if (mddev_trylock(mddev)) {
8332 struct md_rdev *rdev;
8333 if (!mddev->external && mddev->in_sync)
8334 /* 'Blocked' flag not needed as failed devices
8335 * will be recorded if array switched to read/write.
8336 * Leaving it set will prevent the device
8337 * from being removed.
8339 rdev_for_each(rdev, mddev)
8340 clear_bit(Blocked, &rdev->flags);
8341 /* On a read-only array we can:
8342 * - remove failed devices
8343 * - add already-in_sync devices if the array itself
8345 * As we only add devices that are already in-sync,
8346 * we can activate the spares immediately.
8348 remove_and_add_spares(mddev, NULL);
8349 /* There is no thread, but we need to call
8350 * ->spare_active and clear saved_raid_disk
8352 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8353 md_reap_sync_thread(mddev);
8354 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8355 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8356 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
8360 if (mddev_is_clustered(mddev)) {
8361 struct md_rdev *rdev;
8362 /* kick the device if another node issued a
8365 rdev_for_each(rdev, mddev) {
8366 if (test_and_clear_bit(ClusterRemove, &rdev->flags) &&
8367 rdev->raid_disk < 0)
8368 md_kick_rdev_from_array(rdev);
8371 if (test_and_clear_bit(MD_RELOAD_SB, &mddev->flags))
8372 md_reload_sb(mddev, mddev->good_device_nr);
8375 if (!mddev->external) {
8377 spin_lock(&mddev->lock);
8378 if (mddev->safemode &&
8379 !atomic_read(&mddev->writes_pending) &&
8381 mddev->recovery_cp == MaxSector) {
8384 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
8386 if (mddev->safemode == 1)
8387 mddev->safemode = 0;
8388 spin_unlock(&mddev->lock);
8390 sysfs_notify_dirent_safe(mddev->sysfs_state);
8393 if (mddev->flags & MD_UPDATE_SB_FLAGS)
8394 md_update_sb(mddev, 0);
8396 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
8397 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
8398 /* resync/recovery still happening */
8399 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8402 if (mddev->sync_thread) {
8403 md_reap_sync_thread(mddev);
8406 /* Set RUNNING before clearing NEEDED to avoid
8407 * any transients in the value of "sync_action".
8409 mddev->curr_resync_completed = 0;
8410 spin_lock(&mddev->lock);
8411 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
8412 spin_unlock(&mddev->lock);
8413 /* Clear some bits that don't mean anything, but
8416 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
8417 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
8419 if (!test_and_clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
8420 test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
8422 /* no recovery is running.
8423 * remove any failed drives, then
8424 * add spares if possible.
8425 * Spares are also removed and re-added, to allow
8426 * the personality to fail the re-add.
8429 if (mddev->reshape_position != MaxSector) {
8430 if (mddev->pers->check_reshape == NULL ||
8431 mddev->pers->check_reshape(mddev) != 0)
8432 /* Cannot proceed */
8434 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
8435 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8436 } else if ((spares = remove_and_add_spares(mddev, NULL))) {
8437 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8438 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
8439 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
8440 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8441 } else if (mddev->recovery_cp < MaxSector) {
8442 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8443 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8444 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
8445 /* nothing to be done ... */
8448 if (mddev->pers->sync_request) {
8450 /* We are adding a device or devices to an array
8451 * which has the bitmap stored on all devices.
8452 * So make sure all bitmap pages get written
8454 bitmap_write_all(mddev->bitmap);
8456 INIT_WORK(&mddev->del_work, md_start_sync);
8457 queue_work(md_misc_wq, &mddev->del_work);
8461 if (!mddev->sync_thread) {
8462 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
8463 wake_up(&resync_wait);
8464 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
8466 if (mddev->sysfs_action)
8467 sysfs_notify_dirent_safe(mddev->sysfs_action);
8470 wake_up(&mddev->sb_wait);
8471 mddev_unlock(mddev);
8474 EXPORT_SYMBOL(md_check_recovery);
8476 void md_reap_sync_thread(struct mddev *mddev)
8478 struct md_rdev *rdev;
8480 /* resync has finished, collect result */
8481 md_unregister_thread(&mddev->sync_thread);
8482 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8483 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
8485 /* activate any spares */
8486 if (mddev->pers->spare_active(mddev)) {
8487 sysfs_notify(&mddev->kobj, NULL,
8489 set_bit(MD_CHANGE_DEVS, &mddev->flags);
8492 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8493 mddev->pers->finish_reshape)
8494 mddev->pers->finish_reshape(mddev);
8496 /* If array is no-longer degraded, then any saved_raid_disk
8497 * information must be scrapped.
8499 if (!mddev->degraded)
8500 rdev_for_each(rdev, mddev)
8501 rdev->saved_raid_disk = -1;
8503 md_update_sb(mddev, 1);
8504 /* MD_CHANGE_PENDING should be cleared by md_update_sb, so we can
8505 * call resync_finish here if MD_CLUSTER_RESYNC_LOCKED is set by
8507 if (test_and_clear_bit(MD_CLUSTER_RESYNC_LOCKED, &mddev->flags))
8508 md_cluster_ops->resync_finish(mddev);
8509 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
8510 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
8511 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8512 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
8513 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
8514 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
8515 wake_up(&resync_wait);
8516 /* flag recovery needed just to double check */
8517 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8518 sysfs_notify_dirent_safe(mddev->sysfs_action);
8519 md_new_event(mddev);
8520 if (mddev->event_work.func)
8521 queue_work(md_misc_wq, &mddev->event_work);
8523 EXPORT_SYMBOL(md_reap_sync_thread);
8525 void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev)
8527 sysfs_notify_dirent_safe(rdev->sysfs_state);
8528 wait_event_timeout(rdev->blocked_wait,
8529 !test_bit(Blocked, &rdev->flags) &&
8530 !test_bit(BlockedBadBlocks, &rdev->flags),
8531 msecs_to_jiffies(5000));
8532 rdev_dec_pending(rdev, mddev);
8534 EXPORT_SYMBOL(md_wait_for_blocked_rdev);
8536 void md_finish_reshape(struct mddev *mddev)
8538 /* called be personality module when reshape completes. */
8539 struct md_rdev *rdev;
8541 rdev_for_each(rdev, mddev) {
8542 if (rdev->data_offset > rdev->new_data_offset)
8543 rdev->sectors += rdev->data_offset - rdev->new_data_offset;
8545 rdev->sectors -= rdev->new_data_offset - rdev->data_offset;
8546 rdev->data_offset = rdev->new_data_offset;
8549 EXPORT_SYMBOL(md_finish_reshape);
8551 /* Bad block management */
8553 /* Returns 1 on success, 0 on failure */
8554 int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
8557 struct mddev *mddev = rdev->mddev;
8560 s += rdev->new_data_offset;
8562 s += rdev->data_offset;
8563 rv = badblocks_set(&rdev->badblocks, s, sectors, 0);
8565 /* Make sure they get written out promptly */
8566 if (test_bit(ExternalBbl, &rdev->flags))
8567 sysfs_notify(&rdev->kobj, NULL,
8568 "unacknowledged_bad_blocks");
8569 sysfs_notify_dirent_safe(rdev->sysfs_state);
8570 set_mask_bits(&mddev->flags, 0,
8571 BIT(MD_CHANGE_CLEAN) | BIT(MD_CHANGE_PENDING));
8572 md_wakeup_thread(rdev->mddev->thread);
8577 EXPORT_SYMBOL_GPL(rdev_set_badblocks);
8579 int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
8584 s += rdev->new_data_offset;
8586 s += rdev->data_offset;
8587 rv = badblocks_clear(&rdev->badblocks, s, sectors);
8588 if ((rv == 0) && test_bit(ExternalBbl, &rdev->flags))
8589 sysfs_notify(&rdev->kobj, NULL, "bad_blocks");
8592 EXPORT_SYMBOL_GPL(rdev_clear_badblocks);
8594 static int md_notify_reboot(struct notifier_block *this,
8595 unsigned long code, void *x)
8597 struct list_head *tmp;
8598 struct mddev *mddev;
8601 for_each_mddev(mddev, tmp) {
8602 if (mddev_trylock(mddev)) {
8604 __md_stop_writes(mddev);
8605 if (mddev->persistent)
8606 mddev->safemode = 2;
8607 mddev_unlock(mddev);
8612 * certain more exotic SCSI devices are known to be
8613 * volatile wrt too early system reboots. While the
8614 * right place to handle this issue is the given
8615 * driver, we do want to have a safe RAID driver ...
8623 static struct notifier_block md_notifier = {
8624 .notifier_call = md_notify_reboot,
8626 .priority = INT_MAX, /* before any real devices */
8629 static void md_geninit(void)
8631 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
8633 proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops);
8636 static int __init md_init(void)
8640 md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0);
8644 md_misc_wq = alloc_workqueue("md_misc", 0, 0);
8648 if ((ret = register_blkdev(MD_MAJOR, "md")) < 0)
8651 if ((ret = register_blkdev(0, "mdp")) < 0)
8655 blk_register_region(MKDEV(MD_MAJOR, 0), 512, THIS_MODULE,
8656 md_probe, NULL, NULL);
8657 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
8658 md_probe, NULL, NULL);
8660 register_reboot_notifier(&md_notifier);
8661 raid_table_header = register_sysctl_table(raid_root_table);
8667 unregister_blkdev(MD_MAJOR, "md");
8669 destroy_workqueue(md_misc_wq);
8671 destroy_workqueue(md_wq);
8676 static void check_sb_changes(struct mddev *mddev, struct md_rdev *rdev)
8678 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
8679 struct md_rdev *rdev2;
8681 char b[BDEVNAME_SIZE];
8683 /* Check for change of roles in the active devices */
8684 rdev_for_each(rdev2, mddev) {
8685 if (test_bit(Faulty, &rdev2->flags))
8688 /* Check if the roles changed */
8689 role = le16_to_cpu(sb->dev_roles[rdev2->desc_nr]);
8691 if (test_bit(Candidate, &rdev2->flags)) {
8692 if (role == 0xfffe) {
8693 pr_info("md: Removing Candidate device %s because add failed\n", bdevname(rdev2->bdev,b));
8694 md_kick_rdev_from_array(rdev2);
8698 clear_bit(Candidate, &rdev2->flags);
8701 if (role != rdev2->raid_disk) {
8703 if (rdev2->raid_disk == -1 && role != 0xffff) {
8704 rdev2->saved_raid_disk = role;
8705 ret = remove_and_add_spares(mddev, rdev2);
8706 pr_info("Activated spare: %s\n",
8707 bdevname(rdev2->bdev,b));
8708 /* wakeup mddev->thread here, so array could
8709 * perform resync with the new activated disk */
8710 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8711 md_wakeup_thread(mddev->thread);
8715 * We just want to do the minimum to mark the disk
8716 * as faulty. The recovery is performed by the
8717 * one who initiated the error.
8719 if ((role == 0xfffe) || (role == 0xfffd)) {
8720 md_error(mddev, rdev2);
8721 clear_bit(Blocked, &rdev2->flags);
8726 if (mddev->raid_disks != le32_to_cpu(sb->raid_disks))
8727 update_raid_disks(mddev, le32_to_cpu(sb->raid_disks));
8729 /* Finally set the event to be up to date */
8730 mddev->events = le64_to_cpu(sb->events);
8733 static int read_rdev(struct mddev *mddev, struct md_rdev *rdev)
8736 struct page *swapout = rdev->sb_page;
8737 struct mdp_superblock_1 *sb;
8739 /* Store the sb page of the rdev in the swapout temporary
8740 * variable in case we err in the future
8742 rdev->sb_page = NULL;
8743 err = alloc_disk_sb(rdev);
8745 ClearPageUptodate(rdev->sb_page);
8746 rdev->sb_loaded = 0;
8747 err = super_types[mddev->major_version].
8748 load_super(rdev, NULL, mddev->minor_version);
8751 pr_warn("%s: %d Could not reload rdev(%d) err: %d. Restoring old values\n",
8752 __func__, __LINE__, rdev->desc_nr, err);
8754 put_page(rdev->sb_page);
8755 rdev->sb_page = swapout;
8756 rdev->sb_loaded = 1;
8760 sb = page_address(rdev->sb_page);
8761 /* Read the offset unconditionally, even if MD_FEATURE_RECOVERY_OFFSET
8765 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RECOVERY_OFFSET))
8766 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
8768 /* The other node finished recovery, call spare_active to set
8769 * device In_sync and mddev->degraded
8771 if (rdev->recovery_offset == MaxSector &&
8772 !test_bit(In_sync, &rdev->flags) &&
8773 mddev->pers->spare_active(mddev))
8774 sysfs_notify(&mddev->kobj, NULL, "degraded");
8780 void md_reload_sb(struct mddev *mddev, int nr)
8782 struct md_rdev *rdev;
8786 rdev_for_each_rcu(rdev, mddev) {
8787 if (rdev->desc_nr == nr)
8791 if (!rdev || rdev->desc_nr != nr) {
8792 pr_warn("%s: %d Could not find rdev with nr %d\n", __func__, __LINE__, nr);
8796 err = read_rdev(mddev, rdev);
8800 check_sb_changes(mddev, rdev);
8802 /* Read all rdev's to update recovery_offset */
8803 rdev_for_each_rcu(rdev, mddev)
8804 read_rdev(mddev, rdev);
8806 EXPORT_SYMBOL(md_reload_sb);
8811 * Searches all registered partitions for autorun RAID arrays
8815 static DEFINE_MUTEX(detected_devices_mutex);
8816 static LIST_HEAD(all_detected_devices);
8817 struct detected_devices_node {
8818 struct list_head list;
8822 void md_autodetect_dev(dev_t dev)
8824 struct detected_devices_node *node_detected_dev;
8826 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
8827 if (node_detected_dev) {
8828 node_detected_dev->dev = dev;
8829 mutex_lock(&detected_devices_mutex);
8830 list_add_tail(&node_detected_dev->list, &all_detected_devices);
8831 mutex_unlock(&detected_devices_mutex);
8835 static void autostart_arrays(int part)
8837 struct md_rdev *rdev;
8838 struct detected_devices_node *node_detected_dev;
8840 int i_scanned, i_passed;
8845 pr_info("md: Autodetecting RAID arrays.\n");
8847 mutex_lock(&detected_devices_mutex);
8848 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
8850 node_detected_dev = list_entry(all_detected_devices.next,
8851 struct detected_devices_node, list);
8852 list_del(&node_detected_dev->list);
8853 dev = node_detected_dev->dev;
8854 kfree(node_detected_dev);
8855 mutex_unlock(&detected_devices_mutex);
8856 rdev = md_import_device(dev,0, 90);
8857 mutex_lock(&detected_devices_mutex);
8861 if (test_bit(Faulty, &rdev->flags))
8864 set_bit(AutoDetected, &rdev->flags);
8865 list_add(&rdev->same_set, &pending_raid_disks);
8868 mutex_unlock(&detected_devices_mutex);
8870 pr_debug("md: Scanned %d and added %d devices.\n", i_scanned, i_passed);
8872 autorun_devices(part);
8875 #endif /* !MODULE */
8877 static __exit void md_exit(void)
8879 struct mddev *mddev;
8880 struct list_head *tmp;
8883 blk_unregister_region(MKDEV(MD_MAJOR,0), 512);
8884 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
8886 unregister_blkdev(MD_MAJOR,"md");
8887 unregister_blkdev(mdp_major, "mdp");
8888 unregister_reboot_notifier(&md_notifier);
8889 unregister_sysctl_table(raid_table_header);
8891 /* We cannot unload the modules while some process is
8892 * waiting for us in select() or poll() - wake them up
8895 while (waitqueue_active(&md_event_waiters)) {
8896 /* not safe to leave yet */
8897 wake_up(&md_event_waiters);
8901 remove_proc_entry("mdstat", NULL);
8903 for_each_mddev(mddev, tmp) {
8904 export_array(mddev);
8905 mddev->hold_active = 0;
8907 destroy_workqueue(md_misc_wq);
8908 destroy_workqueue(md_wq);
8911 subsys_initcall(md_init);
8912 module_exit(md_exit)
8914 static int get_ro(char *buffer, struct kernel_param *kp)
8916 return sprintf(buffer, "%d", start_readonly);
8918 static int set_ro(const char *val, struct kernel_param *kp)
8920 return kstrtouint(val, 10, (unsigned int *)&start_readonly);
8923 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
8924 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
8925 module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR);
8927 MODULE_LICENSE("GPL");
8928 MODULE_DESCRIPTION("MD RAID framework");
8930 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);