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 set_bit(MD_CHANGE_DEVS, &mddev->flags);
2604 md_wakeup_thread(mddev->thread);
2606 md_new_event(mddev);
2609 } else if (cmd_match(buf, "writemostly")) {
2610 set_bit(WriteMostly, &rdev->flags);
2612 } else if (cmd_match(buf, "-writemostly")) {
2613 clear_bit(WriteMostly, &rdev->flags);
2615 } else if (cmd_match(buf, "blocked")) {
2616 set_bit(Blocked, &rdev->flags);
2618 } else if (cmd_match(buf, "-blocked")) {
2619 if (!test_bit(Faulty, &rdev->flags) &&
2620 !test_bit(ExternalBbl, &rdev->flags) &&
2621 rdev->badblocks.unacked_exist) {
2622 /* metadata handler doesn't understand badblocks,
2623 * so we need to fail the device
2625 md_error(rdev->mddev, rdev);
2627 clear_bit(Blocked, &rdev->flags);
2628 clear_bit(BlockedBadBlocks, &rdev->flags);
2629 wake_up(&rdev->blocked_wait);
2630 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2631 md_wakeup_thread(rdev->mddev->thread);
2634 } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) {
2635 set_bit(In_sync, &rdev->flags);
2637 } else if (cmd_match(buf, "-insync") && rdev->raid_disk >= 0 &&
2638 !test_bit(Journal, &rdev->flags)) {
2639 if (rdev->mddev->pers == NULL) {
2640 clear_bit(In_sync, &rdev->flags);
2641 rdev->saved_raid_disk = rdev->raid_disk;
2642 rdev->raid_disk = -1;
2645 } else if (cmd_match(buf, "write_error")) {
2646 set_bit(WriteErrorSeen, &rdev->flags);
2648 } else if (cmd_match(buf, "-write_error")) {
2649 clear_bit(WriteErrorSeen, &rdev->flags);
2651 } else if (cmd_match(buf, "want_replacement")) {
2652 /* Any non-spare device that is not a replacement can
2653 * become want_replacement at any time, but we then need to
2654 * check if recovery is needed.
2656 if (rdev->raid_disk >= 0 &&
2657 !test_bit(Journal, &rdev->flags) &&
2658 !test_bit(Replacement, &rdev->flags))
2659 set_bit(WantReplacement, &rdev->flags);
2660 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2661 md_wakeup_thread(rdev->mddev->thread);
2663 } else if (cmd_match(buf, "-want_replacement")) {
2664 /* Clearing 'want_replacement' is always allowed.
2665 * Once replacements starts it is too late though.
2668 clear_bit(WantReplacement, &rdev->flags);
2669 } else if (cmd_match(buf, "replacement")) {
2670 /* Can only set a device as a replacement when array has not
2671 * yet been started. Once running, replacement is automatic
2672 * from spares, or by assigning 'slot'.
2674 if (rdev->mddev->pers)
2677 set_bit(Replacement, &rdev->flags);
2680 } else if (cmd_match(buf, "-replacement")) {
2681 /* Similarly, can only clear Replacement before start */
2682 if (rdev->mddev->pers)
2685 clear_bit(Replacement, &rdev->flags);
2688 } else if (cmd_match(buf, "re-add")) {
2689 if (test_bit(Faulty, &rdev->flags) && (rdev->raid_disk == -1)) {
2690 /* clear_bit is performed _after_ all the devices
2691 * have their local Faulty bit cleared. If any writes
2692 * happen in the meantime in the local node, they
2693 * will land in the local bitmap, which will be synced
2694 * by this node eventually
2696 if (!mddev_is_clustered(rdev->mddev) ||
2697 (err = md_cluster_ops->gather_bitmaps(rdev)) == 0) {
2698 clear_bit(Faulty, &rdev->flags);
2699 err = add_bound_rdev(rdev);
2703 } else if (cmd_match(buf, "external_bbl") && (rdev->mddev->external)) {
2704 set_bit(ExternalBbl, &rdev->flags);
2705 rdev->badblocks.shift = 0;
2707 } else if (cmd_match(buf, "-external_bbl") && (rdev->mddev->external)) {
2708 clear_bit(ExternalBbl, &rdev->flags);
2712 sysfs_notify_dirent_safe(rdev->sysfs_state);
2713 return err ? err : len;
2715 static struct rdev_sysfs_entry rdev_state =
2716 __ATTR_PREALLOC(state, S_IRUGO|S_IWUSR, state_show, state_store);
2719 errors_show(struct md_rdev *rdev, char *page)
2721 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
2725 errors_store(struct md_rdev *rdev, const char *buf, size_t len)
2730 rv = kstrtouint(buf, 10, &n);
2733 atomic_set(&rdev->corrected_errors, n);
2736 static struct rdev_sysfs_entry rdev_errors =
2737 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
2740 slot_show(struct md_rdev *rdev, char *page)
2742 if (test_bit(Journal, &rdev->flags))
2743 return sprintf(page, "journal\n");
2744 else if (rdev->raid_disk < 0)
2745 return sprintf(page, "none\n");
2747 return sprintf(page, "%d\n", rdev->raid_disk);
2751 slot_store(struct md_rdev *rdev, const char *buf, size_t len)
2756 if (test_bit(Journal, &rdev->flags))
2758 if (strncmp(buf, "none", 4)==0)
2761 err = kstrtouint(buf, 10, (unsigned int *)&slot);
2765 if (rdev->mddev->pers && slot == -1) {
2766 /* Setting 'slot' on an active array requires also
2767 * updating the 'rd%d' link, and communicating
2768 * with the personality with ->hot_*_disk.
2769 * For now we only support removing
2770 * failed/spare devices. This normally happens automatically,
2771 * but not when the metadata is externally managed.
2773 if (rdev->raid_disk == -1)
2775 /* personality does all needed checks */
2776 if (rdev->mddev->pers->hot_remove_disk == NULL)
2778 clear_bit(Blocked, &rdev->flags);
2779 remove_and_add_spares(rdev->mddev, rdev);
2780 if (rdev->raid_disk >= 0)
2782 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2783 md_wakeup_thread(rdev->mddev->thread);
2784 } else if (rdev->mddev->pers) {
2785 /* Activating a spare .. or possibly reactivating
2786 * if we ever get bitmaps working here.
2790 if (rdev->raid_disk != -1)
2793 if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery))
2796 if (rdev->mddev->pers->hot_add_disk == NULL)
2799 if (slot >= rdev->mddev->raid_disks &&
2800 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
2803 rdev->raid_disk = slot;
2804 if (test_bit(In_sync, &rdev->flags))
2805 rdev->saved_raid_disk = slot;
2807 rdev->saved_raid_disk = -1;
2808 clear_bit(In_sync, &rdev->flags);
2809 clear_bit(Bitmap_sync, &rdev->flags);
2810 err = rdev->mddev->pers->
2811 hot_add_disk(rdev->mddev, rdev);
2813 rdev->raid_disk = -1;
2816 sysfs_notify_dirent_safe(rdev->sysfs_state);
2817 if (sysfs_link_rdev(rdev->mddev, rdev))
2818 /* failure here is OK */;
2819 /* don't wakeup anyone, leave that to userspace. */
2821 if (slot >= rdev->mddev->raid_disks &&
2822 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
2824 rdev->raid_disk = slot;
2825 /* assume it is working */
2826 clear_bit(Faulty, &rdev->flags);
2827 clear_bit(WriteMostly, &rdev->flags);
2828 set_bit(In_sync, &rdev->flags);
2829 sysfs_notify_dirent_safe(rdev->sysfs_state);
2834 static struct rdev_sysfs_entry rdev_slot =
2835 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
2838 offset_show(struct md_rdev *rdev, char *page)
2840 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
2844 offset_store(struct md_rdev *rdev, const char *buf, size_t len)
2846 unsigned long long offset;
2847 if (kstrtoull(buf, 10, &offset) < 0)
2849 if (rdev->mddev->pers && rdev->raid_disk >= 0)
2851 if (rdev->sectors && rdev->mddev->external)
2852 /* Must set offset before size, so overlap checks
2855 rdev->data_offset = offset;
2856 rdev->new_data_offset = offset;
2860 static struct rdev_sysfs_entry rdev_offset =
2861 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
2863 static ssize_t new_offset_show(struct md_rdev *rdev, char *page)
2865 return sprintf(page, "%llu\n",
2866 (unsigned long long)rdev->new_data_offset);
2869 static ssize_t new_offset_store(struct md_rdev *rdev,
2870 const char *buf, size_t len)
2872 unsigned long long new_offset;
2873 struct mddev *mddev = rdev->mddev;
2875 if (kstrtoull(buf, 10, &new_offset) < 0)
2878 if (mddev->sync_thread ||
2879 test_bit(MD_RECOVERY_RUNNING,&mddev->recovery))
2881 if (new_offset == rdev->data_offset)
2882 /* reset is always permitted */
2884 else if (new_offset > rdev->data_offset) {
2885 /* must not push array size beyond rdev_sectors */
2886 if (new_offset - rdev->data_offset
2887 + mddev->dev_sectors > rdev->sectors)
2890 /* Metadata worries about other space details. */
2892 /* decreasing the offset is inconsistent with a backwards
2895 if (new_offset < rdev->data_offset &&
2896 mddev->reshape_backwards)
2898 /* Increasing offset is inconsistent with forwards
2899 * reshape. reshape_direction should be set to
2900 * 'backwards' first.
2902 if (new_offset > rdev->data_offset &&
2903 !mddev->reshape_backwards)
2906 if (mddev->pers && mddev->persistent &&
2907 !super_types[mddev->major_version]
2908 .allow_new_offset(rdev, new_offset))
2910 rdev->new_data_offset = new_offset;
2911 if (new_offset > rdev->data_offset)
2912 mddev->reshape_backwards = 1;
2913 else if (new_offset < rdev->data_offset)
2914 mddev->reshape_backwards = 0;
2918 static struct rdev_sysfs_entry rdev_new_offset =
2919 __ATTR(new_offset, S_IRUGO|S_IWUSR, new_offset_show, new_offset_store);
2922 rdev_size_show(struct md_rdev *rdev, char *page)
2924 return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2);
2927 static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
2929 /* check if two start/length pairs overlap */
2937 static int strict_blocks_to_sectors(const char *buf, sector_t *sectors)
2939 unsigned long long blocks;
2942 if (kstrtoull(buf, 10, &blocks) < 0)
2945 if (blocks & 1ULL << (8 * sizeof(blocks) - 1))
2946 return -EINVAL; /* sector conversion overflow */
2949 if (new != blocks * 2)
2950 return -EINVAL; /* unsigned long long to sector_t overflow */
2957 rdev_size_store(struct md_rdev *rdev, const char *buf, size_t len)
2959 struct mddev *my_mddev = rdev->mddev;
2960 sector_t oldsectors = rdev->sectors;
2963 if (test_bit(Journal, &rdev->flags))
2965 if (strict_blocks_to_sectors(buf, §ors) < 0)
2967 if (rdev->data_offset != rdev->new_data_offset)
2968 return -EINVAL; /* too confusing */
2969 if (my_mddev->pers && rdev->raid_disk >= 0) {
2970 if (my_mddev->persistent) {
2971 sectors = super_types[my_mddev->major_version].
2972 rdev_size_change(rdev, sectors);
2975 } else if (!sectors)
2976 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) -
2978 if (!my_mddev->pers->resize)
2979 /* Cannot change size for RAID0 or Linear etc */
2982 if (sectors < my_mddev->dev_sectors)
2983 return -EINVAL; /* component must fit device */
2985 rdev->sectors = sectors;
2986 if (sectors > oldsectors && my_mddev->external) {
2987 /* Need to check that all other rdevs with the same
2988 * ->bdev do not overlap. 'rcu' is sufficient to walk
2989 * the rdev lists safely.
2990 * This check does not provide a hard guarantee, it
2991 * just helps avoid dangerous mistakes.
2993 struct mddev *mddev;
2995 struct list_head *tmp;
2998 for_each_mddev(mddev, tmp) {
2999 struct md_rdev *rdev2;
3001 rdev_for_each(rdev2, mddev)
3002 if (rdev->bdev == rdev2->bdev &&
3004 overlaps(rdev->data_offset, rdev->sectors,
3017 /* Someone else could have slipped in a size
3018 * change here, but doing so is just silly.
3019 * We put oldsectors back because we *know* it is
3020 * safe, and trust userspace not to race with
3023 rdev->sectors = oldsectors;
3030 static struct rdev_sysfs_entry rdev_size =
3031 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
3033 static ssize_t recovery_start_show(struct md_rdev *rdev, char *page)
3035 unsigned long long recovery_start = rdev->recovery_offset;
3037 if (test_bit(In_sync, &rdev->flags) ||
3038 recovery_start == MaxSector)
3039 return sprintf(page, "none\n");
3041 return sprintf(page, "%llu\n", recovery_start);
3044 static ssize_t recovery_start_store(struct md_rdev *rdev, const char *buf, size_t len)
3046 unsigned long long recovery_start;
3048 if (cmd_match(buf, "none"))
3049 recovery_start = MaxSector;
3050 else if (kstrtoull(buf, 10, &recovery_start))
3053 if (rdev->mddev->pers &&
3054 rdev->raid_disk >= 0)
3057 rdev->recovery_offset = recovery_start;
3058 if (recovery_start == MaxSector)
3059 set_bit(In_sync, &rdev->flags);
3061 clear_bit(In_sync, &rdev->flags);
3065 static struct rdev_sysfs_entry rdev_recovery_start =
3066 __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store);
3068 /* sysfs access to bad-blocks list.
3069 * We present two files.
3070 * 'bad-blocks' lists sector numbers and lengths of ranges that
3071 * are recorded as bad. The list is truncated to fit within
3072 * the one-page limit of sysfs.
3073 * Writing "sector length" to this file adds an acknowledged
3075 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
3076 * been acknowledged. Writing to this file adds bad blocks
3077 * without acknowledging them. This is largely for testing.
3079 static ssize_t bb_show(struct md_rdev *rdev, char *page)
3081 return badblocks_show(&rdev->badblocks, page, 0);
3083 static ssize_t bb_store(struct md_rdev *rdev, const char *page, size_t len)
3085 int rv = badblocks_store(&rdev->badblocks, page, len, 0);
3086 /* Maybe that ack was all we needed */
3087 if (test_and_clear_bit(BlockedBadBlocks, &rdev->flags))
3088 wake_up(&rdev->blocked_wait);
3091 static struct rdev_sysfs_entry rdev_bad_blocks =
3092 __ATTR(bad_blocks, S_IRUGO|S_IWUSR, bb_show, bb_store);
3094 static ssize_t ubb_show(struct md_rdev *rdev, char *page)
3096 return badblocks_show(&rdev->badblocks, page, 1);
3098 static ssize_t ubb_store(struct md_rdev *rdev, const char *page, size_t len)
3100 return badblocks_store(&rdev->badblocks, page, len, 1);
3102 static struct rdev_sysfs_entry rdev_unack_bad_blocks =
3103 __ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store);
3105 static struct attribute *rdev_default_attrs[] = {
3110 &rdev_new_offset.attr,
3112 &rdev_recovery_start.attr,
3113 &rdev_bad_blocks.attr,
3114 &rdev_unack_bad_blocks.attr,
3118 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
3120 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3121 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3127 return entry->show(rdev, page);
3131 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
3132 const char *page, size_t length)
3134 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3135 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3137 struct mddev *mddev = rdev->mddev;
3141 if (!capable(CAP_SYS_ADMIN))
3143 rv = mddev ? mddev_lock(mddev): -EBUSY;
3145 if (rdev->mddev == NULL)
3148 rv = entry->store(rdev, page, length);
3149 mddev_unlock(mddev);
3154 static void rdev_free(struct kobject *ko)
3156 struct md_rdev *rdev = container_of(ko, struct md_rdev, kobj);
3159 static const struct sysfs_ops rdev_sysfs_ops = {
3160 .show = rdev_attr_show,
3161 .store = rdev_attr_store,
3163 static struct kobj_type rdev_ktype = {
3164 .release = rdev_free,
3165 .sysfs_ops = &rdev_sysfs_ops,
3166 .default_attrs = rdev_default_attrs,
3169 int md_rdev_init(struct md_rdev *rdev)
3172 rdev->saved_raid_disk = -1;
3173 rdev->raid_disk = -1;
3175 rdev->data_offset = 0;
3176 rdev->new_data_offset = 0;
3177 rdev->sb_events = 0;
3178 rdev->last_read_error = 0;
3179 rdev->sb_loaded = 0;
3180 rdev->bb_page = NULL;
3181 atomic_set(&rdev->nr_pending, 0);
3182 atomic_set(&rdev->read_errors, 0);
3183 atomic_set(&rdev->corrected_errors, 0);
3185 INIT_LIST_HEAD(&rdev->same_set);
3186 init_waitqueue_head(&rdev->blocked_wait);
3188 /* Add space to store bad block list.
3189 * This reserves the space even on arrays where it cannot
3190 * be used - I wonder if that matters
3192 return badblocks_init(&rdev->badblocks, 0);
3194 EXPORT_SYMBOL_GPL(md_rdev_init);
3196 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3198 * mark the device faulty if:
3200 * - the device is nonexistent (zero size)
3201 * - the device has no valid superblock
3203 * a faulty rdev _never_ has rdev->sb set.
3205 static struct md_rdev *md_import_device(dev_t newdev, int super_format, int super_minor)
3207 char b[BDEVNAME_SIZE];
3209 struct md_rdev *rdev;
3212 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
3214 return ERR_PTR(-ENOMEM);
3216 err = md_rdev_init(rdev);
3219 err = alloc_disk_sb(rdev);
3223 err = lock_rdev(rdev, newdev, super_format == -2);
3227 kobject_init(&rdev->kobj, &rdev_ktype);
3229 size = i_size_read(rdev->bdev->bd_inode) >> BLOCK_SIZE_BITS;
3231 pr_warn("md: %s has zero or unknown size, marking faulty!\n",
3232 bdevname(rdev->bdev,b));
3237 if (super_format >= 0) {
3238 err = super_types[super_format].
3239 load_super(rdev, NULL, super_minor);
3240 if (err == -EINVAL) {
3241 pr_warn("md: %s does not have a valid v%d.%d superblock, not importing!\n",
3242 bdevname(rdev->bdev,b),
3243 super_format, super_minor);
3247 pr_warn("md: could not read %s's sb, not importing!\n",
3248 bdevname(rdev->bdev,b));
3258 md_rdev_clear(rdev);
3260 return ERR_PTR(err);
3264 * Check a full RAID array for plausibility
3267 static void analyze_sbs(struct mddev *mddev)
3270 struct md_rdev *rdev, *freshest, *tmp;
3271 char b[BDEVNAME_SIZE];
3274 rdev_for_each_safe(rdev, tmp, mddev)
3275 switch (super_types[mddev->major_version].
3276 load_super(rdev, freshest, mddev->minor_version)) {
3283 pr_warn("md: fatal superblock inconsistency in %s -- removing from array\n",
3284 bdevname(rdev->bdev,b));
3285 md_kick_rdev_from_array(rdev);
3288 super_types[mddev->major_version].
3289 validate_super(mddev, freshest);
3292 rdev_for_each_safe(rdev, tmp, mddev) {
3293 if (mddev->max_disks &&
3294 (rdev->desc_nr >= mddev->max_disks ||
3295 i > mddev->max_disks)) {
3296 pr_warn("md: %s: %s: only %d devices permitted\n",
3297 mdname(mddev), bdevname(rdev->bdev, b),
3299 md_kick_rdev_from_array(rdev);
3302 if (rdev != freshest) {
3303 if (super_types[mddev->major_version].
3304 validate_super(mddev, rdev)) {
3305 pr_warn("md: kicking non-fresh %s from array!\n",
3306 bdevname(rdev->bdev,b));
3307 md_kick_rdev_from_array(rdev);
3311 if (mddev->level == LEVEL_MULTIPATH) {
3312 rdev->desc_nr = i++;
3313 rdev->raid_disk = rdev->desc_nr;
3314 set_bit(In_sync, &rdev->flags);
3315 } else if (rdev->raid_disk >=
3316 (mddev->raid_disks - min(0, mddev->delta_disks)) &&
3317 !test_bit(Journal, &rdev->flags)) {
3318 rdev->raid_disk = -1;
3319 clear_bit(In_sync, &rdev->flags);
3324 /* Read a fixed-point number.
3325 * Numbers in sysfs attributes should be in "standard" units where
3326 * possible, so time should be in seconds.
3327 * However we internally use a a much smaller unit such as
3328 * milliseconds or jiffies.
3329 * This function takes a decimal number with a possible fractional
3330 * component, and produces an integer which is the result of
3331 * multiplying that number by 10^'scale'.
3332 * all without any floating-point arithmetic.
3334 int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale)
3336 unsigned long result = 0;
3338 while (isdigit(*cp) || (*cp == '.' && decimals < 0)) {
3341 else if (decimals < scale) {
3344 result = result * 10 + value;
3356 while (decimals < scale) {
3365 safe_delay_show(struct mddev *mddev, char *page)
3367 int msec = (mddev->safemode_delay*1000)/HZ;
3368 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
3371 safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len)
3375 if (mddev_is_clustered(mddev)) {
3376 pr_warn("md: Safemode is disabled for clustered mode\n");
3380 if (strict_strtoul_scaled(cbuf, &msec, 3) < 0)
3383 mddev->safemode_delay = 0;
3385 unsigned long old_delay = mddev->safemode_delay;
3386 unsigned long new_delay = (msec*HZ)/1000;
3390 mddev->safemode_delay = new_delay;
3391 if (new_delay < old_delay || old_delay == 0)
3392 mod_timer(&mddev->safemode_timer, jiffies+1);
3396 static struct md_sysfs_entry md_safe_delay =
3397 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
3400 level_show(struct mddev *mddev, char *page)
3402 struct md_personality *p;
3404 spin_lock(&mddev->lock);
3407 ret = sprintf(page, "%s\n", p->name);
3408 else if (mddev->clevel[0])
3409 ret = sprintf(page, "%s\n", mddev->clevel);
3410 else if (mddev->level != LEVEL_NONE)
3411 ret = sprintf(page, "%d\n", mddev->level);
3414 spin_unlock(&mddev->lock);
3419 level_store(struct mddev *mddev, const char *buf, size_t len)
3424 struct md_personality *pers, *oldpers;
3426 void *priv, *oldpriv;
3427 struct md_rdev *rdev;
3429 if (slen == 0 || slen >= sizeof(clevel))
3432 rv = mddev_lock(mddev);
3436 if (mddev->pers == NULL) {
3437 strncpy(mddev->clevel, buf, slen);
3438 if (mddev->clevel[slen-1] == '\n')
3440 mddev->clevel[slen] = 0;
3441 mddev->level = LEVEL_NONE;
3449 /* request to change the personality. Need to ensure:
3450 * - array is not engaged in resync/recovery/reshape
3451 * - old personality can be suspended
3452 * - new personality will access other array.
3456 if (mddev->sync_thread ||
3457 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3458 mddev->reshape_position != MaxSector ||
3459 mddev->sysfs_active)
3463 if (!mddev->pers->quiesce) {
3464 pr_warn("md: %s: %s does not support online personality change\n",
3465 mdname(mddev), mddev->pers->name);
3469 /* Now find the new personality */
3470 strncpy(clevel, buf, slen);
3471 if (clevel[slen-1] == '\n')
3474 if (kstrtol(clevel, 10, &level))
3477 if (request_module("md-%s", clevel) != 0)
3478 request_module("md-level-%s", clevel);
3479 spin_lock(&pers_lock);
3480 pers = find_pers(level, clevel);
3481 if (!pers || !try_module_get(pers->owner)) {
3482 spin_unlock(&pers_lock);
3483 pr_warn("md: personality %s not loaded\n", clevel);
3487 spin_unlock(&pers_lock);
3489 if (pers == mddev->pers) {
3490 /* Nothing to do! */
3491 module_put(pers->owner);
3495 if (!pers->takeover) {
3496 module_put(pers->owner);
3497 pr_warn("md: %s: %s does not support personality takeover\n",
3498 mdname(mddev), clevel);
3503 rdev_for_each(rdev, mddev)
3504 rdev->new_raid_disk = rdev->raid_disk;
3506 /* ->takeover must set new_* and/or delta_disks
3507 * if it succeeds, and may set them when it fails.
3509 priv = pers->takeover(mddev);
3511 mddev->new_level = mddev->level;
3512 mddev->new_layout = mddev->layout;
3513 mddev->new_chunk_sectors = mddev->chunk_sectors;
3514 mddev->raid_disks -= mddev->delta_disks;
3515 mddev->delta_disks = 0;
3516 mddev->reshape_backwards = 0;
3517 module_put(pers->owner);
3518 pr_warn("md: %s: %s would not accept array\n",
3519 mdname(mddev), clevel);
3524 /* Looks like we have a winner */
3525 mddev_suspend(mddev);
3526 mddev_detach(mddev);
3528 spin_lock(&mddev->lock);
3529 oldpers = mddev->pers;
3530 oldpriv = mddev->private;
3532 mddev->private = priv;
3533 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
3534 mddev->level = mddev->new_level;
3535 mddev->layout = mddev->new_layout;
3536 mddev->chunk_sectors = mddev->new_chunk_sectors;
3537 mddev->delta_disks = 0;
3538 mddev->reshape_backwards = 0;
3539 mddev->degraded = 0;
3540 spin_unlock(&mddev->lock);
3542 if (oldpers->sync_request == NULL &&
3544 /* We are converting from a no-redundancy array
3545 * to a redundancy array and metadata is managed
3546 * externally so we need to be sure that writes
3547 * won't block due to a need to transition
3549 * until external management is started.
3552 mddev->safemode_delay = 0;
3553 mddev->safemode = 0;
3556 oldpers->free(mddev, oldpriv);
3558 if (oldpers->sync_request == NULL &&
3559 pers->sync_request != NULL) {
3560 /* need to add the md_redundancy_group */
3561 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
3562 pr_warn("md: cannot register extra attributes for %s\n",
3564 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action");
3566 if (oldpers->sync_request != NULL &&
3567 pers->sync_request == NULL) {
3568 /* need to remove the md_redundancy_group */
3569 if (mddev->to_remove == NULL)
3570 mddev->to_remove = &md_redundancy_group;
3573 module_put(oldpers->owner);
3575 rdev_for_each(rdev, mddev) {
3576 if (rdev->raid_disk < 0)
3578 if (rdev->new_raid_disk >= mddev->raid_disks)
3579 rdev->new_raid_disk = -1;
3580 if (rdev->new_raid_disk == rdev->raid_disk)
3582 sysfs_unlink_rdev(mddev, rdev);
3584 rdev_for_each(rdev, mddev) {
3585 if (rdev->raid_disk < 0)
3587 if (rdev->new_raid_disk == rdev->raid_disk)
3589 rdev->raid_disk = rdev->new_raid_disk;
3590 if (rdev->raid_disk < 0)
3591 clear_bit(In_sync, &rdev->flags);
3593 if (sysfs_link_rdev(mddev, rdev))
3594 pr_warn("md: cannot register rd%d for %s after level change\n",
3595 rdev->raid_disk, mdname(mddev));
3599 if (pers->sync_request == NULL) {
3600 /* this is now an array without redundancy, so
3601 * it must always be in_sync
3604 del_timer_sync(&mddev->safemode_timer);
3606 blk_set_stacking_limits(&mddev->queue->limits);
3608 set_bit(MD_CHANGE_DEVS, &mddev->flags);
3609 mddev_resume(mddev);
3611 md_update_sb(mddev, 1);
3612 sysfs_notify(&mddev->kobj, NULL, "level");
3613 md_new_event(mddev);
3616 mddev_unlock(mddev);
3620 static struct md_sysfs_entry md_level =
3621 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
3624 layout_show(struct mddev *mddev, char *page)
3626 /* just a number, not meaningful for all levels */
3627 if (mddev->reshape_position != MaxSector &&
3628 mddev->layout != mddev->new_layout)
3629 return sprintf(page, "%d (%d)\n",
3630 mddev->new_layout, mddev->layout);
3631 return sprintf(page, "%d\n", mddev->layout);
3635 layout_store(struct mddev *mddev, const char *buf, size_t len)
3640 err = kstrtouint(buf, 10, &n);
3643 err = mddev_lock(mddev);
3648 if (mddev->pers->check_reshape == NULL)
3653 mddev->new_layout = n;
3654 err = mddev->pers->check_reshape(mddev);
3656 mddev->new_layout = mddev->layout;
3659 mddev->new_layout = n;
3660 if (mddev->reshape_position == MaxSector)
3663 mddev_unlock(mddev);
3666 static struct md_sysfs_entry md_layout =
3667 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
3670 raid_disks_show(struct mddev *mddev, char *page)
3672 if (mddev->raid_disks == 0)
3674 if (mddev->reshape_position != MaxSector &&
3675 mddev->delta_disks != 0)
3676 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
3677 mddev->raid_disks - mddev->delta_disks);
3678 return sprintf(page, "%d\n", mddev->raid_disks);
3681 static int update_raid_disks(struct mddev *mddev, int raid_disks);
3684 raid_disks_store(struct mddev *mddev, const char *buf, size_t len)
3689 err = kstrtouint(buf, 10, &n);
3693 err = mddev_lock(mddev);
3697 err = update_raid_disks(mddev, n);
3698 else if (mddev->reshape_position != MaxSector) {
3699 struct md_rdev *rdev;
3700 int olddisks = mddev->raid_disks - mddev->delta_disks;
3703 rdev_for_each(rdev, mddev) {
3705 rdev->data_offset < rdev->new_data_offset)
3708 rdev->data_offset > rdev->new_data_offset)
3712 mddev->delta_disks = n - olddisks;
3713 mddev->raid_disks = n;
3714 mddev->reshape_backwards = (mddev->delta_disks < 0);
3716 mddev->raid_disks = n;
3718 mddev_unlock(mddev);
3719 return err ? err : len;
3721 static struct md_sysfs_entry md_raid_disks =
3722 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
3725 chunk_size_show(struct mddev *mddev, char *page)
3727 if (mddev->reshape_position != MaxSector &&
3728 mddev->chunk_sectors != mddev->new_chunk_sectors)
3729 return sprintf(page, "%d (%d)\n",
3730 mddev->new_chunk_sectors << 9,
3731 mddev->chunk_sectors << 9);
3732 return sprintf(page, "%d\n", mddev->chunk_sectors << 9);
3736 chunk_size_store(struct mddev *mddev, const char *buf, size_t len)
3741 err = kstrtoul(buf, 10, &n);
3745 err = mddev_lock(mddev);
3749 if (mddev->pers->check_reshape == NULL)
3754 mddev->new_chunk_sectors = n >> 9;
3755 err = mddev->pers->check_reshape(mddev);
3757 mddev->new_chunk_sectors = mddev->chunk_sectors;
3760 mddev->new_chunk_sectors = n >> 9;
3761 if (mddev->reshape_position == MaxSector)
3762 mddev->chunk_sectors = n >> 9;
3764 mddev_unlock(mddev);
3767 static struct md_sysfs_entry md_chunk_size =
3768 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
3771 resync_start_show(struct mddev *mddev, char *page)
3773 if (mddev->recovery_cp == MaxSector)
3774 return sprintf(page, "none\n");
3775 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
3779 resync_start_store(struct mddev *mddev, const char *buf, size_t len)
3781 unsigned long long n;
3784 if (cmd_match(buf, "none"))
3787 err = kstrtoull(buf, 10, &n);
3790 if (n != (sector_t)n)
3794 err = mddev_lock(mddev);
3797 if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
3801 mddev->recovery_cp = n;
3803 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
3805 mddev_unlock(mddev);
3808 static struct md_sysfs_entry md_resync_start =
3809 __ATTR_PREALLOC(resync_start, S_IRUGO|S_IWUSR,
3810 resync_start_show, resync_start_store);
3813 * The array state can be:
3816 * No devices, no size, no level
3817 * Equivalent to STOP_ARRAY ioctl
3819 * May have some settings, but array is not active
3820 * all IO results in error
3821 * When written, doesn't tear down array, but just stops it
3822 * suspended (not supported yet)
3823 * All IO requests will block. The array can be reconfigured.
3824 * Writing this, if accepted, will block until array is quiescent
3826 * no resync can happen. no superblocks get written.
3827 * write requests fail
3829 * like readonly, but behaves like 'clean' on a write request.
3831 * clean - no pending writes, but otherwise active.
3832 * When written to inactive array, starts without resync
3833 * If a write request arrives then
3834 * if metadata is known, mark 'dirty' and switch to 'active'.
3835 * if not known, block and switch to write-pending
3836 * If written to an active array that has pending writes, then fails.
3838 * fully active: IO and resync can be happening.
3839 * When written to inactive array, starts with resync
3842 * clean, but writes are blocked waiting for 'active' to be written.
3845 * like active, but no writes have been seen for a while (100msec).
3848 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
3849 write_pending, active_idle, bad_word};
3850 static char *array_states[] = {
3851 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3852 "write-pending", "active-idle", NULL };
3854 static int match_word(const char *word, char **list)
3857 for (n=0; list[n]; n++)
3858 if (cmd_match(word, list[n]))
3864 array_state_show(struct mddev *mddev, char *page)
3866 enum array_state st = inactive;
3877 if (test_bit(MD_CHANGE_PENDING, &mddev->flags))
3879 else if (mddev->in_sync)
3881 else if (mddev->safemode)
3887 if (list_empty(&mddev->disks) &&
3888 mddev->raid_disks == 0 &&
3889 mddev->dev_sectors == 0)
3894 return sprintf(page, "%s\n", array_states[st]);
3897 static int do_md_stop(struct mddev *mddev, int ro, struct block_device *bdev);
3898 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev);
3899 static int do_md_run(struct mddev *mddev);
3900 static int restart_array(struct mddev *mddev);
3903 array_state_store(struct mddev *mddev, const char *buf, size_t len)
3906 enum array_state st = match_word(buf, array_states);
3908 if (mddev->pers && (st == active || st == clean) && mddev->ro != 1) {
3909 /* don't take reconfig_mutex when toggling between
3912 spin_lock(&mddev->lock);
3914 restart_array(mddev);
3915 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
3916 md_wakeup_thread(mddev->thread);
3917 wake_up(&mddev->sb_wait);
3919 } else /* st == clean */ {
3920 restart_array(mddev);
3921 if (atomic_read(&mddev->writes_pending) == 0) {
3922 if (mddev->in_sync == 0) {
3924 if (mddev->safemode == 1)
3925 mddev->safemode = 0;
3926 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
3933 sysfs_notify_dirent_safe(mddev->sysfs_state);
3934 spin_unlock(&mddev->lock);
3937 err = mddev_lock(mddev);
3945 /* stopping an active array */
3946 err = do_md_stop(mddev, 0, NULL);
3949 /* stopping an active array */
3951 err = do_md_stop(mddev, 2, NULL);
3953 err = 0; /* already inactive */
3956 break; /* not supported yet */
3959 err = md_set_readonly(mddev, NULL);
3962 set_disk_ro(mddev->gendisk, 1);
3963 err = do_md_run(mddev);
3969 err = md_set_readonly(mddev, NULL);
3970 else if (mddev->ro == 1)
3971 err = restart_array(mddev);
3974 set_disk_ro(mddev->gendisk, 0);
3978 err = do_md_run(mddev);
3983 err = restart_array(mddev);
3986 spin_lock(&mddev->lock);
3987 if (atomic_read(&mddev->writes_pending) == 0) {
3988 if (mddev->in_sync == 0) {
3990 if (mddev->safemode == 1)
3991 mddev->safemode = 0;
3992 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
3997 spin_unlock(&mddev->lock);
4003 err = restart_array(mddev);
4006 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
4007 wake_up(&mddev->sb_wait);
4011 set_disk_ro(mddev->gendisk, 0);
4012 err = do_md_run(mddev);
4017 /* these cannot be set */
4022 if (mddev->hold_active == UNTIL_IOCTL)
4023 mddev->hold_active = 0;
4024 sysfs_notify_dirent_safe(mddev->sysfs_state);
4026 mddev_unlock(mddev);
4029 static struct md_sysfs_entry md_array_state =
4030 __ATTR_PREALLOC(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
4033 max_corrected_read_errors_show(struct mddev *mddev, char *page) {
4034 return sprintf(page, "%d\n",
4035 atomic_read(&mddev->max_corr_read_errors));
4039 max_corrected_read_errors_store(struct mddev *mddev, const char *buf, size_t len)
4044 rv = kstrtouint(buf, 10, &n);
4047 atomic_set(&mddev->max_corr_read_errors, n);
4051 static struct md_sysfs_entry max_corr_read_errors =
4052 __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show,
4053 max_corrected_read_errors_store);
4056 null_show(struct mddev *mddev, char *page)
4062 new_dev_store(struct mddev *mddev, const char *buf, size_t len)
4064 /* buf must be %d:%d\n? giving major and minor numbers */
4065 /* The new device is added to the array.
4066 * If the array has a persistent superblock, we read the
4067 * superblock to initialise info and check validity.
4068 * Otherwise, only checking done is that in bind_rdev_to_array,
4069 * which mainly checks size.
4072 int major = simple_strtoul(buf, &e, 10);
4075 struct md_rdev *rdev;
4078 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
4080 minor = simple_strtoul(e+1, &e, 10);
4081 if (*e && *e != '\n')
4083 dev = MKDEV(major, minor);
4084 if (major != MAJOR(dev) ||
4085 minor != MINOR(dev))
4088 flush_workqueue(md_misc_wq);
4090 err = mddev_lock(mddev);
4093 if (mddev->persistent) {
4094 rdev = md_import_device(dev, mddev->major_version,
4095 mddev->minor_version);
4096 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
4097 struct md_rdev *rdev0
4098 = list_entry(mddev->disks.next,
4099 struct md_rdev, same_set);
4100 err = super_types[mddev->major_version]
4101 .load_super(rdev, rdev0, mddev->minor_version);
4105 } else if (mddev->external)
4106 rdev = md_import_device(dev, -2, -1);
4108 rdev = md_import_device(dev, -1, -1);
4111 mddev_unlock(mddev);
4112 return PTR_ERR(rdev);
4114 err = bind_rdev_to_array(rdev, mddev);
4118 mddev_unlock(mddev);
4119 return err ? err : len;
4122 static struct md_sysfs_entry md_new_device =
4123 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
4126 bitmap_store(struct mddev *mddev, const char *buf, size_t len)
4129 unsigned long chunk, end_chunk;
4132 err = mddev_lock(mddev);
4137 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
4139 chunk = end_chunk = simple_strtoul(buf, &end, 0);
4140 if (buf == end) break;
4141 if (*end == '-') { /* range */
4143 end_chunk = simple_strtoul(buf, &end, 0);
4144 if (buf == end) break;
4146 if (*end && !isspace(*end)) break;
4147 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
4148 buf = skip_spaces(end);
4150 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
4152 mddev_unlock(mddev);
4156 static struct md_sysfs_entry md_bitmap =
4157 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
4160 size_show(struct mddev *mddev, char *page)
4162 return sprintf(page, "%llu\n",
4163 (unsigned long long)mddev->dev_sectors / 2);
4166 static int update_size(struct mddev *mddev, sector_t num_sectors);
4169 size_store(struct mddev *mddev, const char *buf, size_t len)
4171 /* If array is inactive, we can reduce the component size, but
4172 * not increase it (except from 0).
4173 * If array is active, we can try an on-line resize
4176 int err = strict_blocks_to_sectors(buf, §ors);
4180 err = mddev_lock(mddev);
4184 err = update_size(mddev, sectors);
4186 md_update_sb(mddev, 1);
4188 if (mddev->dev_sectors == 0 ||
4189 mddev->dev_sectors > sectors)
4190 mddev->dev_sectors = sectors;
4194 mddev_unlock(mddev);
4195 return err ? err : len;
4198 static struct md_sysfs_entry md_size =
4199 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
4201 /* Metadata version.
4203 * 'none' for arrays with no metadata (good luck...)
4204 * 'external' for arrays with externally managed metadata,
4205 * or N.M for internally known formats
4208 metadata_show(struct mddev *mddev, char *page)
4210 if (mddev->persistent)
4211 return sprintf(page, "%d.%d\n",
4212 mddev->major_version, mddev->minor_version);
4213 else if (mddev->external)
4214 return sprintf(page, "external:%s\n", mddev->metadata_type);
4216 return sprintf(page, "none\n");
4220 metadata_store(struct mddev *mddev, const char *buf, size_t len)
4225 /* Changing the details of 'external' metadata is
4226 * always permitted. Otherwise there must be
4227 * no devices attached to the array.
4230 err = mddev_lock(mddev);
4234 if (mddev->external && strncmp(buf, "external:", 9) == 0)
4236 else if (!list_empty(&mddev->disks))
4240 if (cmd_match(buf, "none")) {
4241 mddev->persistent = 0;
4242 mddev->external = 0;
4243 mddev->major_version = 0;
4244 mddev->minor_version = 90;
4247 if (strncmp(buf, "external:", 9) == 0) {
4248 size_t namelen = len-9;
4249 if (namelen >= sizeof(mddev->metadata_type))
4250 namelen = sizeof(mddev->metadata_type)-1;
4251 strncpy(mddev->metadata_type, buf+9, namelen);
4252 mddev->metadata_type[namelen] = 0;
4253 if (namelen && mddev->metadata_type[namelen-1] == '\n')
4254 mddev->metadata_type[--namelen] = 0;
4255 mddev->persistent = 0;
4256 mddev->external = 1;
4257 mddev->major_version = 0;
4258 mddev->minor_version = 90;
4261 major = simple_strtoul(buf, &e, 10);
4263 if (e==buf || *e != '.')
4266 minor = simple_strtoul(buf, &e, 10);
4267 if (e==buf || (*e && *e != '\n') )
4270 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
4272 mddev->major_version = major;
4273 mddev->minor_version = minor;
4274 mddev->persistent = 1;
4275 mddev->external = 0;
4278 mddev_unlock(mddev);
4282 static struct md_sysfs_entry md_metadata =
4283 __ATTR_PREALLOC(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
4286 action_show(struct mddev *mddev, char *page)
4288 char *type = "idle";
4289 unsigned long recovery = mddev->recovery;
4290 if (test_bit(MD_RECOVERY_FROZEN, &recovery))
4292 else if (test_bit(MD_RECOVERY_RUNNING, &recovery) ||
4293 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &recovery))) {
4294 if (test_bit(MD_RECOVERY_RESHAPE, &recovery))
4296 else if (test_bit(MD_RECOVERY_SYNC, &recovery)) {
4297 if (!test_bit(MD_RECOVERY_REQUESTED, &recovery))
4299 else if (test_bit(MD_RECOVERY_CHECK, &recovery))
4303 } else if (test_bit(MD_RECOVERY_RECOVER, &recovery))
4305 else if (mddev->reshape_position != MaxSector)
4308 return sprintf(page, "%s\n", type);
4312 action_store(struct mddev *mddev, const char *page, size_t len)
4314 if (!mddev->pers || !mddev->pers->sync_request)
4318 if (cmd_match(page, "idle") || cmd_match(page, "frozen")) {
4319 if (cmd_match(page, "frozen"))
4320 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4322 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4323 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
4324 mddev_lock(mddev) == 0) {
4325 flush_workqueue(md_misc_wq);
4326 if (mddev->sync_thread) {
4327 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4328 md_reap_sync_thread(mddev);
4330 mddev_unlock(mddev);
4332 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4334 else if (cmd_match(page, "resync"))
4335 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4336 else if (cmd_match(page, "recover")) {
4337 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4338 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
4339 } else if (cmd_match(page, "reshape")) {
4341 if (mddev->pers->start_reshape == NULL)
4343 err = mddev_lock(mddev);
4345 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4348 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4349 err = mddev->pers->start_reshape(mddev);
4351 mddev_unlock(mddev);
4355 sysfs_notify(&mddev->kobj, NULL, "degraded");
4357 if (cmd_match(page, "check"))
4358 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
4359 else if (!cmd_match(page, "repair"))
4361 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4362 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
4363 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
4365 if (mddev->ro == 2) {
4366 /* A write to sync_action is enough to justify
4367 * canceling read-auto mode
4370 md_wakeup_thread(mddev->sync_thread);
4372 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4373 md_wakeup_thread(mddev->thread);
4374 sysfs_notify_dirent_safe(mddev->sysfs_action);
4378 static struct md_sysfs_entry md_scan_mode =
4379 __ATTR_PREALLOC(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
4382 last_sync_action_show(struct mddev *mddev, char *page)
4384 return sprintf(page, "%s\n", mddev->last_sync_action);
4387 static struct md_sysfs_entry md_last_scan_mode = __ATTR_RO(last_sync_action);
4390 mismatch_cnt_show(struct mddev *mddev, char *page)
4392 return sprintf(page, "%llu\n",
4393 (unsigned long long)
4394 atomic64_read(&mddev->resync_mismatches));
4397 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
4400 sync_min_show(struct mddev *mddev, char *page)
4402 return sprintf(page, "%d (%s)\n", speed_min(mddev),
4403 mddev->sync_speed_min ? "local": "system");
4407 sync_min_store(struct mddev *mddev, const char *buf, size_t len)
4412 if (strncmp(buf, "system", 6)==0) {
4415 rv = kstrtouint(buf, 10, &min);
4421 mddev->sync_speed_min = min;
4425 static struct md_sysfs_entry md_sync_min =
4426 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
4429 sync_max_show(struct mddev *mddev, char *page)
4431 return sprintf(page, "%d (%s)\n", speed_max(mddev),
4432 mddev->sync_speed_max ? "local": "system");
4436 sync_max_store(struct mddev *mddev, const char *buf, size_t len)
4441 if (strncmp(buf, "system", 6)==0) {
4444 rv = kstrtouint(buf, 10, &max);
4450 mddev->sync_speed_max = max;
4454 static struct md_sysfs_entry md_sync_max =
4455 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
4458 degraded_show(struct mddev *mddev, char *page)
4460 return sprintf(page, "%d\n", mddev->degraded);
4462 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
4465 sync_force_parallel_show(struct mddev *mddev, char *page)
4467 return sprintf(page, "%d\n", mddev->parallel_resync);
4471 sync_force_parallel_store(struct mddev *mddev, const char *buf, size_t len)
4475 if (kstrtol(buf, 10, &n))
4478 if (n != 0 && n != 1)
4481 mddev->parallel_resync = n;
4483 if (mddev->sync_thread)
4484 wake_up(&resync_wait);
4489 /* force parallel resync, even with shared block devices */
4490 static struct md_sysfs_entry md_sync_force_parallel =
4491 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
4492 sync_force_parallel_show, sync_force_parallel_store);
4495 sync_speed_show(struct mddev *mddev, char *page)
4497 unsigned long resync, dt, db;
4498 if (mddev->curr_resync == 0)
4499 return sprintf(page, "none\n");
4500 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
4501 dt = (jiffies - mddev->resync_mark) / HZ;
4503 db = resync - mddev->resync_mark_cnt;
4504 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
4507 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
4510 sync_completed_show(struct mddev *mddev, char *page)
4512 unsigned long long max_sectors, resync;
4514 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4515 return sprintf(page, "none\n");
4517 if (mddev->curr_resync == 1 ||
4518 mddev->curr_resync == 2)
4519 return sprintf(page, "delayed\n");
4521 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
4522 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
4523 max_sectors = mddev->resync_max_sectors;
4525 max_sectors = mddev->dev_sectors;
4527 resync = mddev->curr_resync_completed;
4528 return sprintf(page, "%llu / %llu\n", resync, max_sectors);
4531 static struct md_sysfs_entry md_sync_completed =
4532 __ATTR_PREALLOC(sync_completed, S_IRUGO, sync_completed_show, NULL);
4535 min_sync_show(struct mddev *mddev, char *page)
4537 return sprintf(page, "%llu\n",
4538 (unsigned long long)mddev->resync_min);
4541 min_sync_store(struct mddev *mddev, const char *buf, size_t len)
4543 unsigned long long min;
4546 if (kstrtoull(buf, 10, &min))
4549 spin_lock(&mddev->lock);
4551 if (min > mddev->resync_max)
4555 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4558 /* Round down to multiple of 4K for safety */
4559 mddev->resync_min = round_down(min, 8);
4563 spin_unlock(&mddev->lock);
4567 static struct md_sysfs_entry md_min_sync =
4568 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
4571 max_sync_show(struct mddev *mddev, char *page)
4573 if (mddev->resync_max == MaxSector)
4574 return sprintf(page, "max\n");
4576 return sprintf(page, "%llu\n",
4577 (unsigned long long)mddev->resync_max);
4580 max_sync_store(struct mddev *mddev, const char *buf, size_t len)
4583 spin_lock(&mddev->lock);
4584 if (strncmp(buf, "max", 3) == 0)
4585 mddev->resync_max = MaxSector;
4587 unsigned long long max;
4591 if (kstrtoull(buf, 10, &max))
4593 if (max < mddev->resync_min)
4597 if (max < mddev->resync_max &&
4599 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4602 /* Must be a multiple of chunk_size */
4603 chunk = mddev->chunk_sectors;
4605 sector_t temp = max;
4608 if (sector_div(temp, chunk))
4611 mddev->resync_max = max;
4613 wake_up(&mddev->recovery_wait);
4616 spin_unlock(&mddev->lock);
4620 static struct md_sysfs_entry md_max_sync =
4621 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
4624 suspend_lo_show(struct mddev *mddev, char *page)
4626 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
4630 suspend_lo_store(struct mddev *mddev, const char *buf, size_t len)
4632 unsigned long long old, new;
4635 err = kstrtoull(buf, 10, &new);
4638 if (new != (sector_t)new)
4641 err = mddev_lock(mddev);
4645 if (mddev->pers == NULL ||
4646 mddev->pers->quiesce == NULL)
4648 old = mddev->suspend_lo;
4649 mddev->suspend_lo = new;
4651 /* Shrinking suspended region */
4652 mddev->pers->quiesce(mddev, 2);
4654 /* Expanding suspended region - need to wait */
4655 mddev->pers->quiesce(mddev, 1);
4656 mddev->pers->quiesce(mddev, 0);
4660 mddev_unlock(mddev);
4663 static struct md_sysfs_entry md_suspend_lo =
4664 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
4667 suspend_hi_show(struct mddev *mddev, char *page)
4669 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
4673 suspend_hi_store(struct mddev *mddev, const char *buf, size_t len)
4675 unsigned long long old, new;
4678 err = kstrtoull(buf, 10, &new);
4681 if (new != (sector_t)new)
4684 err = mddev_lock(mddev);
4688 if (mddev->pers == NULL ||
4689 mddev->pers->quiesce == NULL)
4691 old = mddev->suspend_hi;
4692 mddev->suspend_hi = new;
4694 /* Shrinking suspended region */
4695 mddev->pers->quiesce(mddev, 2);
4697 /* Expanding suspended region - need to wait */
4698 mddev->pers->quiesce(mddev, 1);
4699 mddev->pers->quiesce(mddev, 0);
4703 mddev_unlock(mddev);
4706 static struct md_sysfs_entry md_suspend_hi =
4707 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
4710 reshape_position_show(struct mddev *mddev, char *page)
4712 if (mddev->reshape_position != MaxSector)
4713 return sprintf(page, "%llu\n",
4714 (unsigned long long)mddev->reshape_position);
4715 strcpy(page, "none\n");
4720 reshape_position_store(struct mddev *mddev, const char *buf, size_t len)
4722 struct md_rdev *rdev;
4723 unsigned long long new;
4726 err = kstrtoull(buf, 10, &new);
4729 if (new != (sector_t)new)
4731 err = mddev_lock(mddev);
4737 mddev->reshape_position = new;
4738 mddev->delta_disks = 0;
4739 mddev->reshape_backwards = 0;
4740 mddev->new_level = mddev->level;
4741 mddev->new_layout = mddev->layout;
4742 mddev->new_chunk_sectors = mddev->chunk_sectors;
4743 rdev_for_each(rdev, mddev)
4744 rdev->new_data_offset = rdev->data_offset;
4747 mddev_unlock(mddev);
4751 static struct md_sysfs_entry md_reshape_position =
4752 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
4753 reshape_position_store);
4756 reshape_direction_show(struct mddev *mddev, char *page)
4758 return sprintf(page, "%s\n",
4759 mddev->reshape_backwards ? "backwards" : "forwards");
4763 reshape_direction_store(struct mddev *mddev, const char *buf, size_t len)
4768 if (cmd_match(buf, "forwards"))
4770 else if (cmd_match(buf, "backwards"))
4774 if (mddev->reshape_backwards == backwards)
4777 err = mddev_lock(mddev);
4780 /* check if we are allowed to change */
4781 if (mddev->delta_disks)
4783 else if (mddev->persistent &&
4784 mddev->major_version == 0)
4787 mddev->reshape_backwards = backwards;
4788 mddev_unlock(mddev);
4792 static struct md_sysfs_entry md_reshape_direction =
4793 __ATTR(reshape_direction, S_IRUGO|S_IWUSR, reshape_direction_show,
4794 reshape_direction_store);
4797 array_size_show(struct mddev *mddev, char *page)
4799 if (mddev->external_size)
4800 return sprintf(page, "%llu\n",
4801 (unsigned long long)mddev->array_sectors/2);
4803 return sprintf(page, "default\n");
4807 array_size_store(struct mddev *mddev, const char *buf, size_t len)
4812 err = mddev_lock(mddev);
4816 /* cluster raid doesn't support change array_sectors */
4817 if (mddev_is_clustered(mddev))
4820 if (strncmp(buf, "default", 7) == 0) {
4822 sectors = mddev->pers->size(mddev, 0, 0);
4824 sectors = mddev->array_sectors;
4826 mddev->external_size = 0;
4828 if (strict_blocks_to_sectors(buf, §ors) < 0)
4830 else if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors)
4833 mddev->external_size = 1;
4837 mddev->array_sectors = sectors;
4839 set_capacity(mddev->gendisk, mddev->array_sectors);
4840 revalidate_disk(mddev->gendisk);
4843 mddev_unlock(mddev);
4847 static struct md_sysfs_entry md_array_size =
4848 __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show,
4851 static struct attribute *md_default_attrs[] = {
4854 &md_raid_disks.attr,
4855 &md_chunk_size.attr,
4857 &md_resync_start.attr,
4859 &md_new_device.attr,
4860 &md_safe_delay.attr,
4861 &md_array_state.attr,
4862 &md_reshape_position.attr,
4863 &md_reshape_direction.attr,
4864 &md_array_size.attr,
4865 &max_corr_read_errors.attr,
4869 static struct attribute *md_redundancy_attrs[] = {
4871 &md_last_scan_mode.attr,
4872 &md_mismatches.attr,
4875 &md_sync_speed.attr,
4876 &md_sync_force_parallel.attr,
4877 &md_sync_completed.attr,
4880 &md_suspend_lo.attr,
4881 &md_suspend_hi.attr,
4886 static struct attribute_group md_redundancy_group = {
4888 .attrs = md_redundancy_attrs,
4892 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
4894 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
4895 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
4900 spin_lock(&all_mddevs_lock);
4901 if (list_empty(&mddev->all_mddevs)) {
4902 spin_unlock(&all_mddevs_lock);
4906 spin_unlock(&all_mddevs_lock);
4908 rv = entry->show(mddev, page);
4914 md_attr_store(struct kobject *kobj, struct attribute *attr,
4915 const char *page, size_t length)
4917 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
4918 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
4923 if (!capable(CAP_SYS_ADMIN))
4925 spin_lock(&all_mddevs_lock);
4926 if (list_empty(&mddev->all_mddevs)) {
4927 spin_unlock(&all_mddevs_lock);
4931 spin_unlock(&all_mddevs_lock);
4932 rv = entry->store(mddev, page, length);
4937 static void md_free(struct kobject *ko)
4939 struct mddev *mddev = container_of(ko, struct mddev, kobj);
4941 if (mddev->sysfs_state)
4942 sysfs_put(mddev->sysfs_state);
4945 blk_cleanup_queue(mddev->queue);
4946 if (mddev->gendisk) {
4947 del_gendisk(mddev->gendisk);
4948 put_disk(mddev->gendisk);
4954 static const struct sysfs_ops md_sysfs_ops = {
4955 .show = md_attr_show,
4956 .store = md_attr_store,
4958 static struct kobj_type md_ktype = {
4960 .sysfs_ops = &md_sysfs_ops,
4961 .default_attrs = md_default_attrs,
4966 static void mddev_delayed_delete(struct work_struct *ws)
4968 struct mddev *mddev = container_of(ws, struct mddev, del_work);
4970 sysfs_remove_group(&mddev->kobj, &md_bitmap_group);
4971 kobject_del(&mddev->kobj);
4972 kobject_put(&mddev->kobj);
4975 static int md_alloc(dev_t dev, char *name)
4977 static DEFINE_MUTEX(disks_mutex);
4978 struct mddev *mddev = mddev_find(dev);
4979 struct gendisk *disk;
4988 partitioned = (MAJOR(mddev->unit) != MD_MAJOR);
4989 shift = partitioned ? MdpMinorShift : 0;
4990 unit = MINOR(mddev->unit) >> shift;
4992 /* wait for any previous instance of this device to be
4993 * completely removed (mddev_delayed_delete).
4995 flush_workqueue(md_misc_wq);
4997 mutex_lock(&disks_mutex);
5003 /* Need to ensure that 'name' is not a duplicate.
5005 struct mddev *mddev2;
5006 spin_lock(&all_mddevs_lock);
5008 list_for_each_entry(mddev2, &all_mddevs, all_mddevs)
5009 if (mddev2->gendisk &&
5010 strcmp(mddev2->gendisk->disk_name, name) == 0) {
5011 spin_unlock(&all_mddevs_lock);
5014 spin_unlock(&all_mddevs_lock);
5018 mddev->queue = blk_alloc_queue(GFP_KERNEL);
5021 mddev->queue->queuedata = mddev;
5023 blk_queue_make_request(mddev->queue, md_make_request);
5024 blk_set_stacking_limits(&mddev->queue->limits);
5026 disk = alloc_disk(1 << shift);
5028 blk_cleanup_queue(mddev->queue);
5029 mddev->queue = NULL;
5032 disk->major = MAJOR(mddev->unit);
5033 disk->first_minor = unit << shift;
5035 strcpy(disk->disk_name, name);
5036 else if (partitioned)
5037 sprintf(disk->disk_name, "md_d%d", unit);
5039 sprintf(disk->disk_name, "md%d", unit);
5040 disk->fops = &md_fops;
5041 disk->private_data = mddev;
5042 disk->queue = mddev->queue;
5043 blk_queue_write_cache(mddev->queue, true, true);
5044 /* Allow extended partitions. This makes the
5045 * 'mdp' device redundant, but we can't really
5048 disk->flags |= GENHD_FL_EXT_DEVT;
5049 mddev->gendisk = disk;
5050 /* As soon as we call add_disk(), another thread could get
5051 * through to md_open, so make sure it doesn't get too far
5053 mutex_lock(&mddev->open_mutex);
5056 error = kobject_init_and_add(&mddev->kobj, &md_ktype,
5057 &disk_to_dev(disk)->kobj, "%s", "md");
5059 /* This isn't possible, but as kobject_init_and_add is marked
5060 * __must_check, we must do something with the result
5062 pr_debug("md: cannot register %s/md - name in use\n",
5066 if (mddev->kobj.sd &&
5067 sysfs_create_group(&mddev->kobj, &md_bitmap_group))
5068 pr_debug("pointless warning\n");
5069 mutex_unlock(&mddev->open_mutex);
5071 mutex_unlock(&disks_mutex);
5072 if (!error && mddev->kobj.sd) {
5073 kobject_uevent(&mddev->kobj, KOBJ_ADD);
5074 mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state");
5080 static struct kobject *md_probe(dev_t dev, int *part, void *data)
5082 md_alloc(dev, NULL);
5086 static int add_named_array(const char *val, struct kernel_param *kp)
5088 /* val must be "md_*" where * is not all digits.
5089 * We allocate an array with a large free minor number, and
5090 * set the name to val. val must not already be an active name.
5092 int len = strlen(val);
5093 char buf[DISK_NAME_LEN];
5095 while (len && val[len-1] == '\n')
5097 if (len >= DISK_NAME_LEN)
5099 strlcpy(buf, val, len+1);
5100 if (strncmp(buf, "md_", 3) != 0)
5102 return md_alloc(0, buf);
5105 static void md_safemode_timeout(unsigned long data)
5107 struct mddev *mddev = (struct mddev *) data;
5109 if (!atomic_read(&mddev->writes_pending)) {
5110 mddev->safemode = 1;
5111 if (mddev->external)
5112 sysfs_notify_dirent_safe(mddev->sysfs_state);
5114 md_wakeup_thread(mddev->thread);
5117 static int start_dirty_degraded;
5119 int md_run(struct mddev *mddev)
5122 struct md_rdev *rdev;
5123 struct md_personality *pers;
5125 if (list_empty(&mddev->disks))
5126 /* cannot run an array with no devices.. */
5131 /* Cannot run until previous stop completes properly */
5132 if (mddev->sysfs_active)
5136 * Analyze all RAID superblock(s)
5138 if (!mddev->raid_disks) {
5139 if (!mddev->persistent)
5144 if (mddev->level != LEVEL_NONE)
5145 request_module("md-level-%d", mddev->level);
5146 else if (mddev->clevel[0])
5147 request_module("md-%s", mddev->clevel);
5150 * Drop all container device buffers, from now on
5151 * the only valid external interface is through the md
5154 rdev_for_each(rdev, mddev) {
5155 if (test_bit(Faulty, &rdev->flags))
5157 sync_blockdev(rdev->bdev);
5158 invalidate_bdev(rdev->bdev);
5160 /* perform some consistency tests on the device.
5161 * We don't want the data to overlap the metadata,
5162 * Internal Bitmap issues have been handled elsewhere.
5164 if (rdev->meta_bdev) {
5165 /* Nothing to check */;
5166 } else if (rdev->data_offset < rdev->sb_start) {
5167 if (mddev->dev_sectors &&
5168 rdev->data_offset + mddev->dev_sectors
5170 pr_warn("md: %s: data overlaps metadata\n",
5175 if (rdev->sb_start + rdev->sb_size/512
5176 > rdev->data_offset) {
5177 pr_warn("md: %s: metadata overlaps data\n",
5182 sysfs_notify_dirent_safe(rdev->sysfs_state);
5185 if (mddev->bio_set == NULL)
5186 mddev->bio_set = bioset_create(BIO_POOL_SIZE, 0);
5188 spin_lock(&pers_lock);
5189 pers = find_pers(mddev->level, mddev->clevel);
5190 if (!pers || !try_module_get(pers->owner)) {
5191 spin_unlock(&pers_lock);
5192 if (mddev->level != LEVEL_NONE)
5193 pr_warn("md: personality for level %d is not loaded!\n",
5196 pr_warn("md: personality for level %s is not loaded!\n",
5200 spin_unlock(&pers_lock);
5201 if (mddev->level != pers->level) {
5202 mddev->level = pers->level;
5203 mddev->new_level = pers->level;
5205 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
5207 if (mddev->reshape_position != MaxSector &&
5208 pers->start_reshape == NULL) {
5209 /* This personality cannot handle reshaping... */
5210 module_put(pers->owner);
5214 if (pers->sync_request) {
5215 /* Warn if this is a potentially silly
5218 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
5219 struct md_rdev *rdev2;
5222 rdev_for_each(rdev, mddev)
5223 rdev_for_each(rdev2, mddev) {
5225 rdev->bdev->bd_contains ==
5226 rdev2->bdev->bd_contains) {
5227 pr_warn("%s: WARNING: %s appears to be on the same physical disk as %s.\n",
5229 bdevname(rdev->bdev,b),
5230 bdevname(rdev2->bdev,b2));
5236 pr_warn("True protection against single-disk failure might be compromised.\n");
5239 mddev->recovery = 0;
5240 /* may be over-ridden by personality */
5241 mddev->resync_max_sectors = mddev->dev_sectors;
5243 mddev->ok_start_degraded = start_dirty_degraded;
5245 if (start_readonly && mddev->ro == 0)
5246 mddev->ro = 2; /* read-only, but switch on first write */
5248 err = pers->run(mddev);
5250 pr_warn("md: pers->run() failed ...\n");
5251 else if (pers->size(mddev, 0, 0) < mddev->array_sectors) {
5252 WARN_ONCE(!mddev->external_size,
5253 "%s: default size too small, but 'external_size' not in effect?\n",
5255 pr_warn("md: invalid array_size %llu > default size %llu\n",
5256 (unsigned long long)mddev->array_sectors / 2,
5257 (unsigned long long)pers->size(mddev, 0, 0) / 2);
5260 if (err == 0 && pers->sync_request &&
5261 (mddev->bitmap_info.file || mddev->bitmap_info.offset)) {
5262 struct bitmap *bitmap;
5264 bitmap = bitmap_create(mddev, -1);
5265 if (IS_ERR(bitmap)) {
5266 err = PTR_ERR(bitmap);
5267 pr_warn("%s: failed to create bitmap (%d)\n",
5268 mdname(mddev), err);
5270 mddev->bitmap = bitmap;
5274 mddev_detach(mddev);
5276 pers->free(mddev, mddev->private);
5277 mddev->private = NULL;
5278 module_put(pers->owner);
5279 bitmap_destroy(mddev);
5285 rdev_for_each(rdev, mddev) {
5286 if (rdev->raid_disk >= 0 &&
5287 !blk_queue_nonrot(bdev_get_queue(rdev->bdev))) {
5292 if (mddev->degraded)
5295 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, mddev->queue);
5297 queue_flag_clear_unlocked(QUEUE_FLAG_NONROT, mddev->queue);
5298 mddev->queue->backing_dev_info.congested_data = mddev;
5299 mddev->queue->backing_dev_info.congested_fn = md_congested;
5301 if (pers->sync_request) {
5302 if (mddev->kobj.sd &&
5303 sysfs_create_group(&mddev->kobj, &md_redundancy_group))
5304 pr_warn("md: cannot register extra attributes for %s\n",
5306 mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action");
5307 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
5310 atomic_set(&mddev->writes_pending,0);
5311 atomic_set(&mddev->max_corr_read_errors,
5312 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS);
5313 mddev->safemode = 0;
5314 if (mddev_is_clustered(mddev))
5315 mddev->safemode_delay = 0;
5317 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
5320 spin_lock(&mddev->lock);
5322 spin_unlock(&mddev->lock);
5323 rdev_for_each(rdev, mddev)
5324 if (rdev->raid_disk >= 0)
5325 if (sysfs_link_rdev(mddev, rdev))
5326 /* failure here is OK */;
5328 if (mddev->degraded && !mddev->ro)
5329 /* This ensures that recovering status is reported immediately
5330 * via sysfs - until a lack of spares is confirmed.
5332 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
5333 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5335 if (mddev->flags & MD_UPDATE_SB_FLAGS)
5336 md_update_sb(mddev, 0);
5338 md_new_event(mddev);
5339 sysfs_notify_dirent_safe(mddev->sysfs_state);
5340 sysfs_notify_dirent_safe(mddev->sysfs_action);
5341 sysfs_notify(&mddev->kobj, NULL, "degraded");
5344 EXPORT_SYMBOL_GPL(md_run);
5346 static int do_md_run(struct mddev *mddev)
5350 err = md_run(mddev);
5353 err = bitmap_load(mddev);
5355 bitmap_destroy(mddev);
5359 if (mddev_is_clustered(mddev))
5360 md_allow_write(mddev);
5362 md_wakeup_thread(mddev->thread);
5363 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
5365 set_capacity(mddev->gendisk, mddev->array_sectors);
5366 revalidate_disk(mddev->gendisk);
5368 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
5373 static int restart_array(struct mddev *mddev)
5375 struct gendisk *disk = mddev->gendisk;
5377 /* Complain if it has no devices */
5378 if (list_empty(&mddev->disks))
5384 if (test_bit(MD_HAS_JOURNAL, &mddev->flags)) {
5385 struct md_rdev *rdev;
5386 bool has_journal = false;
5389 rdev_for_each_rcu(rdev, mddev) {
5390 if (test_bit(Journal, &rdev->flags) &&
5391 !test_bit(Faulty, &rdev->flags)) {
5398 /* Don't restart rw with journal missing/faulty */
5403 mddev->safemode = 0;
5405 set_disk_ro(disk, 0);
5406 pr_debug("md: %s switched to read-write mode.\n", mdname(mddev));
5407 /* Kick recovery or resync if necessary */
5408 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5409 md_wakeup_thread(mddev->thread);
5410 md_wakeup_thread(mddev->sync_thread);
5411 sysfs_notify_dirent_safe(mddev->sysfs_state);
5415 static void md_clean(struct mddev *mddev)
5417 mddev->array_sectors = 0;
5418 mddev->external_size = 0;
5419 mddev->dev_sectors = 0;
5420 mddev->raid_disks = 0;
5421 mddev->recovery_cp = 0;
5422 mddev->resync_min = 0;
5423 mddev->resync_max = MaxSector;
5424 mddev->reshape_position = MaxSector;
5425 mddev->external = 0;
5426 mddev->persistent = 0;
5427 mddev->level = LEVEL_NONE;
5428 mddev->clevel[0] = 0;
5431 mddev->metadata_type[0] = 0;
5432 mddev->chunk_sectors = 0;
5433 mddev->ctime = mddev->utime = 0;
5435 mddev->max_disks = 0;
5437 mddev->can_decrease_events = 0;
5438 mddev->delta_disks = 0;
5439 mddev->reshape_backwards = 0;
5440 mddev->new_level = LEVEL_NONE;
5441 mddev->new_layout = 0;
5442 mddev->new_chunk_sectors = 0;
5443 mddev->curr_resync = 0;
5444 atomic64_set(&mddev->resync_mismatches, 0);
5445 mddev->suspend_lo = mddev->suspend_hi = 0;
5446 mddev->sync_speed_min = mddev->sync_speed_max = 0;
5447 mddev->recovery = 0;
5450 mddev->degraded = 0;
5451 mddev->safemode = 0;
5452 mddev->private = NULL;
5453 mddev->cluster_info = NULL;
5454 mddev->bitmap_info.offset = 0;
5455 mddev->bitmap_info.default_offset = 0;
5456 mddev->bitmap_info.default_space = 0;
5457 mddev->bitmap_info.chunksize = 0;
5458 mddev->bitmap_info.daemon_sleep = 0;
5459 mddev->bitmap_info.max_write_behind = 0;
5460 mddev->bitmap_info.nodes = 0;
5463 static void __md_stop_writes(struct mddev *mddev)
5465 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5466 flush_workqueue(md_misc_wq);
5467 if (mddev->sync_thread) {
5468 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5469 md_reap_sync_thread(mddev);
5472 del_timer_sync(&mddev->safemode_timer);
5474 bitmap_flush(mddev);
5475 md_super_wait(mddev);
5477 if (mddev->ro == 0 &&
5478 ((!mddev->in_sync && !mddev_is_clustered(mddev)) ||
5479 (mddev->flags & MD_UPDATE_SB_FLAGS))) {
5480 /* mark array as shutdown cleanly */
5481 if (!mddev_is_clustered(mddev))
5483 md_update_sb(mddev, 1);
5487 void md_stop_writes(struct mddev *mddev)
5489 mddev_lock_nointr(mddev);
5490 __md_stop_writes(mddev);
5491 mddev_unlock(mddev);
5493 EXPORT_SYMBOL_GPL(md_stop_writes);
5495 static void mddev_detach(struct mddev *mddev)
5497 struct bitmap *bitmap = mddev->bitmap;
5498 /* wait for behind writes to complete */
5499 if (bitmap && atomic_read(&bitmap->behind_writes) > 0) {
5500 pr_debug("md:%s: behind writes in progress - waiting to stop.\n",
5502 /* need to kick something here to make sure I/O goes? */
5503 wait_event(bitmap->behind_wait,
5504 atomic_read(&bitmap->behind_writes) == 0);
5506 if (mddev->pers && mddev->pers->quiesce) {
5507 mddev->pers->quiesce(mddev, 1);
5508 mddev->pers->quiesce(mddev, 0);
5510 md_unregister_thread(&mddev->thread);
5512 blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/
5515 static void __md_stop(struct mddev *mddev)
5517 struct md_personality *pers = mddev->pers;
5518 mddev_detach(mddev);
5519 /* Ensure ->event_work is done */
5520 flush_workqueue(md_misc_wq);
5521 spin_lock(&mddev->lock);
5523 spin_unlock(&mddev->lock);
5524 pers->free(mddev, mddev->private);
5525 mddev->private = NULL;
5526 if (pers->sync_request && mddev->to_remove == NULL)
5527 mddev->to_remove = &md_redundancy_group;
5528 module_put(pers->owner);
5529 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5532 void md_stop(struct mddev *mddev)
5534 /* stop the array and free an attached data structures.
5535 * This is called from dm-raid
5538 bitmap_destroy(mddev);
5540 bioset_free(mddev->bio_set);
5543 EXPORT_SYMBOL_GPL(md_stop);
5545 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev)
5550 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
5552 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5553 md_wakeup_thread(mddev->thread);
5555 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5556 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5557 if (mddev->sync_thread)
5558 /* Thread might be blocked waiting for metadata update
5559 * which will now never happen */
5560 wake_up_process(mddev->sync_thread->tsk);
5562 if (mddev->external && test_bit(MD_CHANGE_PENDING, &mddev->flags))
5564 mddev_unlock(mddev);
5565 wait_event(resync_wait, !test_bit(MD_RECOVERY_RUNNING,
5567 wait_event(mddev->sb_wait,
5568 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
5569 mddev_lock_nointr(mddev);
5571 mutex_lock(&mddev->open_mutex);
5572 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
5573 mddev->sync_thread ||
5574 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
5575 pr_warn("md: %s still in use.\n",mdname(mddev));
5577 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5578 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5579 md_wakeup_thread(mddev->thread);
5585 __md_stop_writes(mddev);
5591 set_disk_ro(mddev->gendisk, 1);
5592 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5593 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5594 md_wakeup_thread(mddev->thread);
5595 sysfs_notify_dirent_safe(mddev->sysfs_state);
5599 mutex_unlock(&mddev->open_mutex);
5604 * 0 - completely stop and dis-assemble array
5605 * 2 - stop but do not disassemble array
5607 static int do_md_stop(struct mddev *mddev, int mode,
5608 struct block_device *bdev)
5610 struct gendisk *disk = mddev->gendisk;
5611 struct md_rdev *rdev;
5614 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
5616 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5617 md_wakeup_thread(mddev->thread);
5619 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5620 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5621 if (mddev->sync_thread)
5622 /* Thread might be blocked waiting for metadata update
5623 * which will now never happen */
5624 wake_up_process(mddev->sync_thread->tsk);
5626 mddev_unlock(mddev);
5627 wait_event(resync_wait, (mddev->sync_thread == NULL &&
5628 !test_bit(MD_RECOVERY_RUNNING,
5629 &mddev->recovery)));
5630 mddev_lock_nointr(mddev);
5632 mutex_lock(&mddev->open_mutex);
5633 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
5634 mddev->sysfs_active ||
5635 mddev->sync_thread ||
5636 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
5637 pr_warn("md: %s still in use.\n",mdname(mddev));
5638 mutex_unlock(&mddev->open_mutex);
5640 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5641 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5642 md_wakeup_thread(mddev->thread);
5648 set_disk_ro(disk, 0);
5650 __md_stop_writes(mddev);
5652 mddev->queue->backing_dev_info.congested_fn = NULL;
5654 /* tell userspace to handle 'inactive' */
5655 sysfs_notify_dirent_safe(mddev->sysfs_state);
5657 rdev_for_each(rdev, mddev)
5658 if (rdev->raid_disk >= 0)
5659 sysfs_unlink_rdev(mddev, rdev);
5661 set_capacity(disk, 0);
5662 mutex_unlock(&mddev->open_mutex);
5664 revalidate_disk(disk);
5669 mutex_unlock(&mddev->open_mutex);
5671 * Free resources if final stop
5674 pr_info("md: %s stopped.\n", mdname(mddev));
5676 bitmap_destroy(mddev);
5677 if (mddev->bitmap_info.file) {
5678 struct file *f = mddev->bitmap_info.file;
5679 spin_lock(&mddev->lock);
5680 mddev->bitmap_info.file = NULL;
5681 spin_unlock(&mddev->lock);
5684 mddev->bitmap_info.offset = 0;
5686 export_array(mddev);
5689 if (mddev->hold_active == UNTIL_STOP)
5690 mddev->hold_active = 0;
5692 md_new_event(mddev);
5693 sysfs_notify_dirent_safe(mddev->sysfs_state);
5698 static void autorun_array(struct mddev *mddev)
5700 struct md_rdev *rdev;
5703 if (list_empty(&mddev->disks))
5706 pr_info("md: running: ");
5708 rdev_for_each(rdev, mddev) {
5709 char b[BDEVNAME_SIZE];
5710 pr_cont("<%s>", bdevname(rdev->bdev,b));
5714 err = do_md_run(mddev);
5716 pr_warn("md: do_md_run() returned %d\n", err);
5717 do_md_stop(mddev, 0, NULL);
5722 * lets try to run arrays based on all disks that have arrived
5723 * until now. (those are in pending_raid_disks)
5725 * the method: pick the first pending disk, collect all disks with
5726 * the same UUID, remove all from the pending list and put them into
5727 * the 'same_array' list. Then order this list based on superblock
5728 * update time (freshest comes first), kick out 'old' disks and
5729 * compare superblocks. If everything's fine then run it.
5731 * If "unit" is allocated, then bump its reference count
5733 static void autorun_devices(int part)
5735 struct md_rdev *rdev0, *rdev, *tmp;
5736 struct mddev *mddev;
5737 char b[BDEVNAME_SIZE];
5739 pr_info("md: autorun ...\n");
5740 while (!list_empty(&pending_raid_disks)) {
5743 LIST_HEAD(candidates);
5744 rdev0 = list_entry(pending_raid_disks.next,
5745 struct md_rdev, same_set);
5747 pr_debug("md: considering %s ...\n", bdevname(rdev0->bdev,b));
5748 INIT_LIST_HEAD(&candidates);
5749 rdev_for_each_list(rdev, tmp, &pending_raid_disks)
5750 if (super_90_load(rdev, rdev0, 0) >= 0) {
5751 pr_debug("md: adding %s ...\n",
5752 bdevname(rdev->bdev,b));
5753 list_move(&rdev->same_set, &candidates);
5756 * now we have a set of devices, with all of them having
5757 * mostly sane superblocks. It's time to allocate the
5761 dev = MKDEV(mdp_major,
5762 rdev0->preferred_minor << MdpMinorShift);
5763 unit = MINOR(dev) >> MdpMinorShift;
5765 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
5768 if (rdev0->preferred_minor != unit) {
5769 pr_warn("md: unit number in %s is bad: %d\n",
5770 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
5774 md_probe(dev, NULL, NULL);
5775 mddev = mddev_find(dev);
5776 if (!mddev || !mddev->gendisk) {
5781 if (mddev_lock(mddev))
5782 pr_warn("md: %s locked, cannot run\n", mdname(mddev));
5783 else if (mddev->raid_disks || mddev->major_version
5784 || !list_empty(&mddev->disks)) {
5785 pr_warn("md: %s already running, cannot run %s\n",
5786 mdname(mddev), bdevname(rdev0->bdev,b));
5787 mddev_unlock(mddev);
5789 pr_debug("md: created %s\n", mdname(mddev));
5790 mddev->persistent = 1;
5791 rdev_for_each_list(rdev, tmp, &candidates) {
5792 list_del_init(&rdev->same_set);
5793 if (bind_rdev_to_array(rdev, mddev))
5796 autorun_array(mddev);
5797 mddev_unlock(mddev);
5799 /* on success, candidates will be empty, on error
5802 rdev_for_each_list(rdev, tmp, &candidates) {
5803 list_del_init(&rdev->same_set);
5808 pr_info("md: ... autorun DONE.\n");
5810 #endif /* !MODULE */
5812 static int get_version(void __user *arg)
5816 ver.major = MD_MAJOR_VERSION;
5817 ver.minor = MD_MINOR_VERSION;
5818 ver.patchlevel = MD_PATCHLEVEL_VERSION;
5820 if (copy_to_user(arg, &ver, sizeof(ver)))
5826 static int get_array_info(struct mddev *mddev, void __user *arg)
5828 mdu_array_info_t info;
5829 int nr,working,insync,failed,spare;
5830 struct md_rdev *rdev;
5832 nr = working = insync = failed = spare = 0;
5834 rdev_for_each_rcu(rdev, mddev) {
5836 if (test_bit(Faulty, &rdev->flags))
5840 if (test_bit(In_sync, &rdev->flags))
5842 else if (test_bit(Journal, &rdev->flags))
5843 /* TODO: add journal count to md_u.h */
5851 info.major_version = mddev->major_version;
5852 info.minor_version = mddev->minor_version;
5853 info.patch_version = MD_PATCHLEVEL_VERSION;
5854 info.ctime = clamp_t(time64_t, mddev->ctime, 0, U32_MAX);
5855 info.level = mddev->level;
5856 info.size = mddev->dev_sectors / 2;
5857 if (info.size != mddev->dev_sectors / 2) /* overflow */
5860 info.raid_disks = mddev->raid_disks;
5861 info.md_minor = mddev->md_minor;
5862 info.not_persistent= !mddev->persistent;
5864 info.utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX);
5867 info.state = (1<<MD_SB_CLEAN);
5868 if (mddev->bitmap && mddev->bitmap_info.offset)
5869 info.state |= (1<<MD_SB_BITMAP_PRESENT);
5870 if (mddev_is_clustered(mddev))
5871 info.state |= (1<<MD_SB_CLUSTERED);
5872 info.active_disks = insync;
5873 info.working_disks = working;
5874 info.failed_disks = failed;
5875 info.spare_disks = spare;
5877 info.layout = mddev->layout;
5878 info.chunk_size = mddev->chunk_sectors << 9;
5880 if (copy_to_user(arg, &info, sizeof(info)))
5886 static int get_bitmap_file(struct mddev *mddev, void __user * arg)
5888 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
5892 file = kzalloc(sizeof(*file), GFP_NOIO);
5897 spin_lock(&mddev->lock);
5898 /* bitmap enabled */
5899 if (mddev->bitmap_info.file) {
5900 ptr = file_path(mddev->bitmap_info.file, file->pathname,
5901 sizeof(file->pathname));
5905 memmove(file->pathname, ptr,
5906 sizeof(file->pathname)-(ptr-file->pathname));
5908 spin_unlock(&mddev->lock);
5911 copy_to_user(arg, file, sizeof(*file)))
5918 static int get_disk_info(struct mddev *mddev, void __user * arg)
5920 mdu_disk_info_t info;
5921 struct md_rdev *rdev;
5923 if (copy_from_user(&info, arg, sizeof(info)))
5927 rdev = md_find_rdev_nr_rcu(mddev, info.number);
5929 info.major = MAJOR(rdev->bdev->bd_dev);
5930 info.minor = MINOR(rdev->bdev->bd_dev);
5931 info.raid_disk = rdev->raid_disk;
5933 if (test_bit(Faulty, &rdev->flags))
5934 info.state |= (1<<MD_DISK_FAULTY);
5935 else if (test_bit(In_sync, &rdev->flags)) {
5936 info.state |= (1<<MD_DISK_ACTIVE);
5937 info.state |= (1<<MD_DISK_SYNC);
5939 if (test_bit(Journal, &rdev->flags))
5940 info.state |= (1<<MD_DISK_JOURNAL);
5941 if (test_bit(WriteMostly, &rdev->flags))
5942 info.state |= (1<<MD_DISK_WRITEMOSTLY);
5944 info.major = info.minor = 0;
5945 info.raid_disk = -1;
5946 info.state = (1<<MD_DISK_REMOVED);
5950 if (copy_to_user(arg, &info, sizeof(info)))
5956 static int add_new_disk(struct mddev *mddev, mdu_disk_info_t *info)
5958 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
5959 struct md_rdev *rdev;
5960 dev_t dev = MKDEV(info->major,info->minor);
5962 if (mddev_is_clustered(mddev) &&
5963 !(info->state & ((1 << MD_DISK_CLUSTER_ADD) | (1 << MD_DISK_CANDIDATE)))) {
5964 pr_warn("%s: Cannot add to clustered mddev.\n",
5969 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
5972 if (!mddev->raid_disks) {
5974 /* expecting a device which has a superblock */
5975 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
5977 pr_warn("md: md_import_device returned %ld\n",
5979 return PTR_ERR(rdev);
5981 if (!list_empty(&mddev->disks)) {
5982 struct md_rdev *rdev0
5983 = list_entry(mddev->disks.next,
5984 struct md_rdev, same_set);
5985 err = super_types[mddev->major_version]
5986 .load_super(rdev, rdev0, mddev->minor_version);
5988 pr_warn("md: %s has different UUID to %s\n",
5989 bdevname(rdev->bdev,b),
5990 bdevname(rdev0->bdev,b2));
5995 err = bind_rdev_to_array(rdev, mddev);
6002 * add_new_disk can be used once the array is assembled
6003 * to add "hot spares". They must already have a superblock
6008 if (!mddev->pers->hot_add_disk) {
6009 pr_warn("%s: personality does not support diskops!\n",
6013 if (mddev->persistent)
6014 rdev = md_import_device(dev, mddev->major_version,
6015 mddev->minor_version);
6017 rdev = md_import_device(dev, -1, -1);
6019 pr_warn("md: md_import_device returned %ld\n",
6021 return PTR_ERR(rdev);
6023 /* set saved_raid_disk if appropriate */
6024 if (!mddev->persistent) {
6025 if (info->state & (1<<MD_DISK_SYNC) &&
6026 info->raid_disk < mddev->raid_disks) {
6027 rdev->raid_disk = info->raid_disk;
6028 set_bit(In_sync, &rdev->flags);
6029 clear_bit(Bitmap_sync, &rdev->flags);
6031 rdev->raid_disk = -1;
6032 rdev->saved_raid_disk = rdev->raid_disk;
6034 super_types[mddev->major_version].
6035 validate_super(mddev, rdev);
6036 if ((info->state & (1<<MD_DISK_SYNC)) &&
6037 rdev->raid_disk != info->raid_disk) {
6038 /* This was a hot-add request, but events doesn't
6039 * match, so reject it.
6045 clear_bit(In_sync, &rdev->flags); /* just to be sure */
6046 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
6047 set_bit(WriteMostly, &rdev->flags);
6049 clear_bit(WriteMostly, &rdev->flags);
6051 if (info->state & (1<<MD_DISK_JOURNAL)) {
6052 struct md_rdev *rdev2;
6053 bool has_journal = false;
6055 /* make sure no existing journal disk */
6056 rdev_for_each(rdev2, mddev) {
6057 if (test_bit(Journal, &rdev2->flags)) {
6066 set_bit(Journal, &rdev->flags);
6069 * check whether the device shows up in other nodes
6071 if (mddev_is_clustered(mddev)) {
6072 if (info->state & (1 << MD_DISK_CANDIDATE))
6073 set_bit(Candidate, &rdev->flags);
6074 else if (info->state & (1 << MD_DISK_CLUSTER_ADD)) {
6075 /* --add initiated by this node */
6076 err = md_cluster_ops->add_new_disk(mddev, rdev);
6084 rdev->raid_disk = -1;
6085 err = bind_rdev_to_array(rdev, mddev);
6090 if (mddev_is_clustered(mddev)) {
6091 if (info->state & (1 << MD_DISK_CANDIDATE)) {
6093 err = md_cluster_ops->new_disk_ack(mddev,
6096 md_kick_rdev_from_array(rdev);
6100 md_cluster_ops->add_new_disk_cancel(mddev);
6102 err = add_bound_rdev(rdev);
6106 err = add_bound_rdev(rdev);
6111 /* otherwise, add_new_disk is only allowed
6112 * for major_version==0 superblocks
6114 if (mddev->major_version != 0) {
6115 pr_warn("%s: ADD_NEW_DISK not supported\n", mdname(mddev));
6119 if (!(info->state & (1<<MD_DISK_FAULTY))) {
6121 rdev = md_import_device(dev, -1, 0);
6123 pr_warn("md: error, md_import_device() returned %ld\n",
6125 return PTR_ERR(rdev);
6127 rdev->desc_nr = info->number;
6128 if (info->raid_disk < mddev->raid_disks)
6129 rdev->raid_disk = info->raid_disk;
6131 rdev->raid_disk = -1;
6133 if (rdev->raid_disk < mddev->raid_disks)
6134 if (info->state & (1<<MD_DISK_SYNC))
6135 set_bit(In_sync, &rdev->flags);
6137 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
6138 set_bit(WriteMostly, &rdev->flags);
6140 if (!mddev->persistent) {
6141 pr_debug("md: nonpersistent superblock ...\n");
6142 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
6144 rdev->sb_start = calc_dev_sboffset(rdev);
6145 rdev->sectors = rdev->sb_start;
6147 err = bind_rdev_to_array(rdev, mddev);
6157 static int hot_remove_disk(struct mddev *mddev, dev_t dev)
6159 char b[BDEVNAME_SIZE];
6160 struct md_rdev *rdev;
6162 rdev = find_rdev(mddev, dev);
6166 if (rdev->raid_disk < 0)
6169 clear_bit(Blocked, &rdev->flags);
6170 remove_and_add_spares(mddev, rdev);
6172 if (rdev->raid_disk >= 0)
6176 if (mddev_is_clustered(mddev))
6177 md_cluster_ops->remove_disk(mddev, rdev);
6179 md_kick_rdev_from_array(rdev);
6180 set_bit(MD_CHANGE_DEVS, &mddev->flags);
6182 md_wakeup_thread(mddev->thread);
6184 md_update_sb(mddev, 1);
6185 md_new_event(mddev);
6189 pr_debug("md: cannot remove active disk %s from %s ...\n",
6190 bdevname(rdev->bdev,b), mdname(mddev));
6194 static int hot_add_disk(struct mddev *mddev, dev_t dev)
6196 char b[BDEVNAME_SIZE];
6198 struct md_rdev *rdev;
6203 if (mddev->major_version != 0) {
6204 pr_warn("%s: HOT_ADD may only be used with version-0 superblocks.\n",
6208 if (!mddev->pers->hot_add_disk) {
6209 pr_warn("%s: personality does not support diskops!\n",
6214 rdev = md_import_device(dev, -1, 0);
6216 pr_warn("md: error, md_import_device() returned %ld\n",
6221 if (mddev->persistent)
6222 rdev->sb_start = calc_dev_sboffset(rdev);
6224 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
6226 rdev->sectors = rdev->sb_start;
6228 if (test_bit(Faulty, &rdev->flags)) {
6229 pr_warn("md: can not hot-add faulty %s disk to %s!\n",
6230 bdevname(rdev->bdev,b), mdname(mddev));
6235 clear_bit(In_sync, &rdev->flags);
6237 rdev->saved_raid_disk = -1;
6238 err = bind_rdev_to_array(rdev, mddev);
6243 * The rest should better be atomic, we can have disk failures
6244 * noticed in interrupt contexts ...
6247 rdev->raid_disk = -1;
6249 set_bit(MD_CHANGE_DEVS, &mddev->flags);
6251 md_update_sb(mddev, 1);
6253 * Kick recovery, maybe this spare has to be added to the
6254 * array immediately.
6256 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6257 md_wakeup_thread(mddev->thread);
6258 md_new_event(mddev);
6266 static int set_bitmap_file(struct mddev *mddev, int fd)
6271 if (!mddev->pers->quiesce || !mddev->thread)
6273 if (mddev->recovery || mddev->sync_thread)
6275 /* we should be able to change the bitmap.. */
6279 struct inode *inode;
6282 if (mddev->bitmap || mddev->bitmap_info.file)
6283 return -EEXIST; /* cannot add when bitmap is present */
6287 pr_warn("%s: error: failed to get bitmap file\n",
6292 inode = f->f_mapping->host;
6293 if (!S_ISREG(inode->i_mode)) {
6294 pr_warn("%s: error: bitmap file must be a regular file\n",
6297 } else if (!(f->f_mode & FMODE_WRITE)) {
6298 pr_warn("%s: error: bitmap file must open for write\n",
6301 } else if (atomic_read(&inode->i_writecount) != 1) {
6302 pr_warn("%s: error: bitmap file is already in use\n",
6310 mddev->bitmap_info.file = f;
6311 mddev->bitmap_info.offset = 0; /* file overrides offset */
6312 } else if (mddev->bitmap == NULL)
6313 return -ENOENT; /* cannot remove what isn't there */
6316 mddev->pers->quiesce(mddev, 1);
6318 struct bitmap *bitmap;
6320 bitmap = bitmap_create(mddev, -1);
6321 if (!IS_ERR(bitmap)) {
6322 mddev->bitmap = bitmap;
6323 err = bitmap_load(mddev);
6325 err = PTR_ERR(bitmap);
6327 if (fd < 0 || err) {
6328 bitmap_destroy(mddev);
6329 fd = -1; /* make sure to put the file */
6331 mddev->pers->quiesce(mddev, 0);
6334 struct file *f = mddev->bitmap_info.file;
6336 spin_lock(&mddev->lock);
6337 mddev->bitmap_info.file = NULL;
6338 spin_unlock(&mddev->lock);
6347 * set_array_info is used two different ways
6348 * The original usage is when creating a new array.
6349 * In this usage, raid_disks is > 0 and it together with
6350 * level, size, not_persistent,layout,chunksize determine the
6351 * shape of the array.
6352 * This will always create an array with a type-0.90.0 superblock.
6353 * The newer usage is when assembling an array.
6354 * In this case raid_disks will be 0, and the major_version field is
6355 * use to determine which style super-blocks are to be found on the devices.
6356 * The minor and patch _version numbers are also kept incase the
6357 * super_block handler wishes to interpret them.
6359 static int set_array_info(struct mddev *mddev, mdu_array_info_t *info)
6362 if (info->raid_disks == 0) {
6363 /* just setting version number for superblock loading */
6364 if (info->major_version < 0 ||
6365 info->major_version >= ARRAY_SIZE(super_types) ||
6366 super_types[info->major_version].name == NULL) {
6367 /* maybe try to auto-load a module? */
6368 pr_warn("md: superblock version %d not known\n",
6369 info->major_version);
6372 mddev->major_version = info->major_version;
6373 mddev->minor_version = info->minor_version;
6374 mddev->patch_version = info->patch_version;
6375 mddev->persistent = !info->not_persistent;
6376 /* ensure mddev_put doesn't delete this now that there
6377 * is some minimal configuration.
6379 mddev->ctime = ktime_get_real_seconds();
6382 mddev->major_version = MD_MAJOR_VERSION;
6383 mddev->minor_version = MD_MINOR_VERSION;
6384 mddev->patch_version = MD_PATCHLEVEL_VERSION;
6385 mddev->ctime = ktime_get_real_seconds();
6387 mddev->level = info->level;
6388 mddev->clevel[0] = 0;
6389 mddev->dev_sectors = 2 * (sector_t)info->size;
6390 mddev->raid_disks = info->raid_disks;
6391 /* don't set md_minor, it is determined by which /dev/md* was
6394 if (info->state & (1<<MD_SB_CLEAN))
6395 mddev->recovery_cp = MaxSector;
6397 mddev->recovery_cp = 0;
6398 mddev->persistent = ! info->not_persistent;
6399 mddev->external = 0;
6401 mddev->layout = info->layout;
6402 mddev->chunk_sectors = info->chunk_size >> 9;
6404 mddev->max_disks = MD_SB_DISKS;
6406 if (mddev->persistent)
6408 set_bit(MD_CHANGE_DEVS, &mddev->flags);
6410 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
6411 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
6412 mddev->bitmap_info.offset = 0;
6414 mddev->reshape_position = MaxSector;
6417 * Generate a 128 bit UUID
6419 get_random_bytes(mddev->uuid, 16);
6421 mddev->new_level = mddev->level;
6422 mddev->new_chunk_sectors = mddev->chunk_sectors;
6423 mddev->new_layout = mddev->layout;
6424 mddev->delta_disks = 0;
6425 mddev->reshape_backwards = 0;
6430 void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors)
6432 WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__);
6434 if (mddev->external_size)
6437 mddev->array_sectors = array_sectors;
6439 EXPORT_SYMBOL(md_set_array_sectors);
6441 static int update_size(struct mddev *mddev, sector_t num_sectors)
6443 struct md_rdev *rdev;
6445 int fit = (num_sectors == 0);
6447 /* cluster raid doesn't support update size */
6448 if (mddev_is_clustered(mddev))
6451 if (mddev->pers->resize == NULL)
6453 /* The "num_sectors" is the number of sectors of each device that
6454 * is used. This can only make sense for arrays with redundancy.
6455 * linear and raid0 always use whatever space is available. We can only
6456 * consider changing this number if no resync or reconstruction is
6457 * happening, and if the new size is acceptable. It must fit before the
6458 * sb_start or, if that is <data_offset, it must fit before the size
6459 * of each device. If num_sectors is zero, we find the largest size
6462 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
6468 rdev_for_each(rdev, mddev) {
6469 sector_t avail = rdev->sectors;
6471 if (fit && (num_sectors == 0 || num_sectors > avail))
6472 num_sectors = avail;
6473 if (avail < num_sectors)
6476 rv = mddev->pers->resize(mddev, num_sectors);
6478 revalidate_disk(mddev->gendisk);
6482 static int update_raid_disks(struct mddev *mddev, int raid_disks)
6485 struct md_rdev *rdev;
6486 /* change the number of raid disks */
6487 if (mddev->pers->check_reshape == NULL)
6491 if (raid_disks <= 0 ||
6492 (mddev->max_disks && raid_disks >= mddev->max_disks))
6494 if (mddev->sync_thread ||
6495 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
6496 mddev->reshape_position != MaxSector)
6499 rdev_for_each(rdev, mddev) {
6500 if (mddev->raid_disks < raid_disks &&
6501 rdev->data_offset < rdev->new_data_offset)
6503 if (mddev->raid_disks > raid_disks &&
6504 rdev->data_offset > rdev->new_data_offset)
6508 mddev->delta_disks = raid_disks - mddev->raid_disks;
6509 if (mddev->delta_disks < 0)
6510 mddev->reshape_backwards = 1;
6511 else if (mddev->delta_disks > 0)
6512 mddev->reshape_backwards = 0;
6514 rv = mddev->pers->check_reshape(mddev);
6516 mddev->delta_disks = 0;
6517 mddev->reshape_backwards = 0;
6523 * update_array_info is used to change the configuration of an
6525 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
6526 * fields in the info are checked against the array.
6527 * Any differences that cannot be handled will cause an error.
6528 * Normally, only one change can be managed at a time.
6530 static int update_array_info(struct mddev *mddev, mdu_array_info_t *info)
6536 /* calculate expected state,ignoring low bits */
6537 if (mddev->bitmap && mddev->bitmap_info.offset)
6538 state |= (1 << MD_SB_BITMAP_PRESENT);
6540 if (mddev->major_version != info->major_version ||
6541 mddev->minor_version != info->minor_version ||
6542 /* mddev->patch_version != info->patch_version || */
6543 mddev->ctime != info->ctime ||
6544 mddev->level != info->level ||
6545 /* mddev->layout != info->layout || */
6546 mddev->persistent != !info->not_persistent ||
6547 mddev->chunk_sectors != info->chunk_size >> 9 ||
6548 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
6549 ((state^info->state) & 0xfffffe00)
6552 /* Check there is only one change */
6553 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
6555 if (mddev->raid_disks != info->raid_disks)
6557 if (mddev->layout != info->layout)
6559 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT))
6566 if (mddev->layout != info->layout) {
6568 * we don't need to do anything at the md level, the
6569 * personality will take care of it all.
6571 if (mddev->pers->check_reshape == NULL)
6574 mddev->new_layout = info->layout;
6575 rv = mddev->pers->check_reshape(mddev);
6577 mddev->new_layout = mddev->layout;
6581 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
6582 rv = update_size(mddev, (sector_t)info->size * 2);
6584 if (mddev->raid_disks != info->raid_disks)
6585 rv = update_raid_disks(mddev, info->raid_disks);
6587 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
6588 if (mddev->pers->quiesce == NULL || mddev->thread == NULL) {
6592 if (mddev->recovery || mddev->sync_thread) {
6596 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
6597 struct bitmap *bitmap;
6598 /* add the bitmap */
6599 if (mddev->bitmap) {
6603 if (mddev->bitmap_info.default_offset == 0) {
6607 mddev->bitmap_info.offset =
6608 mddev->bitmap_info.default_offset;
6609 mddev->bitmap_info.space =
6610 mddev->bitmap_info.default_space;
6611 mddev->pers->quiesce(mddev, 1);
6612 bitmap = bitmap_create(mddev, -1);
6613 if (!IS_ERR(bitmap)) {
6614 mddev->bitmap = bitmap;
6615 rv = bitmap_load(mddev);
6617 rv = PTR_ERR(bitmap);
6619 bitmap_destroy(mddev);
6620 mddev->pers->quiesce(mddev, 0);
6622 /* remove the bitmap */
6623 if (!mddev->bitmap) {
6627 if (mddev->bitmap->storage.file) {
6631 if (mddev->bitmap_info.nodes) {
6632 /* hold PW on all the bitmap lock */
6633 if (md_cluster_ops->lock_all_bitmaps(mddev) <= 0) {
6634 pr_warn("md: can't change bitmap to none since the array is in use by more than one node\n");
6636 md_cluster_ops->unlock_all_bitmaps(mddev);
6640 mddev->bitmap_info.nodes = 0;
6641 md_cluster_ops->leave(mddev);
6643 mddev->pers->quiesce(mddev, 1);
6644 bitmap_destroy(mddev);
6645 mddev->pers->quiesce(mddev, 0);
6646 mddev->bitmap_info.offset = 0;
6649 md_update_sb(mddev, 1);
6655 static int set_disk_faulty(struct mddev *mddev, dev_t dev)
6657 struct md_rdev *rdev;
6660 if (mddev->pers == NULL)
6664 rdev = find_rdev_rcu(mddev, dev);
6668 md_error(mddev, rdev);
6669 if (!test_bit(Faulty, &rdev->flags))
6677 * We have a problem here : there is no easy way to give a CHS
6678 * virtual geometry. We currently pretend that we have a 2 heads
6679 * 4 sectors (with a BIG number of cylinders...). This drives
6680 * dosfs just mad... ;-)
6682 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
6684 struct mddev *mddev = bdev->bd_disk->private_data;
6688 geo->cylinders = mddev->array_sectors / 8;
6692 static inline bool md_ioctl_valid(unsigned int cmd)
6697 case GET_ARRAY_INFO:
6698 case GET_BITMAP_FILE:
6701 case HOT_REMOVE_DISK:
6704 case RESTART_ARRAY_RW:
6706 case SET_ARRAY_INFO:
6707 case SET_BITMAP_FILE:
6708 case SET_DISK_FAULTY:
6711 case CLUSTERED_DISK_NACK:
6718 static int md_ioctl(struct block_device *bdev, fmode_t mode,
6719 unsigned int cmd, unsigned long arg)
6722 void __user *argp = (void __user *)arg;
6723 struct mddev *mddev = NULL;
6726 if (!md_ioctl_valid(cmd))
6731 case GET_ARRAY_INFO:
6735 if (!capable(CAP_SYS_ADMIN))
6740 * Commands dealing with the RAID driver but not any
6745 err = get_version(argp);
6751 autostart_arrays(arg);
6758 * Commands creating/starting a new array:
6761 mddev = bdev->bd_disk->private_data;
6768 /* Some actions do not requires the mutex */
6770 case GET_ARRAY_INFO:
6771 if (!mddev->raid_disks && !mddev->external)
6774 err = get_array_info(mddev, argp);
6778 if (!mddev->raid_disks && !mddev->external)
6781 err = get_disk_info(mddev, argp);
6784 case SET_DISK_FAULTY:
6785 err = set_disk_faulty(mddev, new_decode_dev(arg));
6788 case GET_BITMAP_FILE:
6789 err = get_bitmap_file(mddev, argp);
6794 if (cmd == ADD_NEW_DISK)
6795 /* need to ensure md_delayed_delete() has completed */
6796 flush_workqueue(md_misc_wq);
6798 if (cmd == HOT_REMOVE_DISK)
6799 /* need to ensure recovery thread has run */
6800 wait_event_interruptible_timeout(mddev->sb_wait,
6801 !test_bit(MD_RECOVERY_NEEDED,
6803 msecs_to_jiffies(5000));
6804 if (cmd == STOP_ARRAY || cmd == STOP_ARRAY_RO) {
6805 /* Need to flush page cache, and ensure no-one else opens
6808 mutex_lock(&mddev->open_mutex);
6809 if (mddev->pers && atomic_read(&mddev->openers) > 1) {
6810 mutex_unlock(&mddev->open_mutex);
6814 set_bit(MD_CLOSING, &mddev->flags);
6815 mutex_unlock(&mddev->open_mutex);
6816 sync_blockdev(bdev);
6818 err = mddev_lock(mddev);
6820 pr_debug("md: ioctl lock interrupted, reason %d, cmd %d\n",
6825 if (cmd == SET_ARRAY_INFO) {
6826 mdu_array_info_t info;
6828 memset(&info, 0, sizeof(info));
6829 else if (copy_from_user(&info, argp, sizeof(info))) {
6834 err = update_array_info(mddev, &info);
6836 pr_warn("md: couldn't update array info. %d\n", err);
6841 if (!list_empty(&mddev->disks)) {
6842 pr_warn("md: array %s already has disks!\n", mdname(mddev));
6846 if (mddev->raid_disks) {
6847 pr_warn("md: array %s already initialised!\n", mdname(mddev));
6851 err = set_array_info(mddev, &info);
6853 pr_warn("md: couldn't set array info. %d\n", err);
6860 * Commands querying/configuring an existing array:
6862 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
6863 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
6864 if ((!mddev->raid_disks && !mddev->external)
6865 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
6866 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
6867 && cmd != GET_BITMAP_FILE) {
6873 * Commands even a read-only array can execute:
6876 case RESTART_ARRAY_RW:
6877 err = restart_array(mddev);
6881 err = do_md_stop(mddev, 0, bdev);
6885 err = md_set_readonly(mddev, bdev);
6888 case HOT_REMOVE_DISK:
6889 err = hot_remove_disk(mddev, new_decode_dev(arg));
6893 /* We can support ADD_NEW_DISK on read-only arrays
6894 * only if we are re-adding a preexisting device.
6895 * So require mddev->pers and MD_DISK_SYNC.
6898 mdu_disk_info_t info;
6899 if (copy_from_user(&info, argp, sizeof(info)))
6901 else if (!(info.state & (1<<MD_DISK_SYNC)))
6902 /* Need to clear read-only for this */
6905 err = add_new_disk(mddev, &info);
6911 if (get_user(ro, (int __user *)(arg))) {
6917 /* if the bdev is going readonly the value of mddev->ro
6918 * does not matter, no writes are coming
6923 /* are we are already prepared for writes? */
6927 /* transitioning to readauto need only happen for
6928 * arrays that call md_write_start
6931 err = restart_array(mddev);
6934 set_disk_ro(mddev->gendisk, 0);
6941 * The remaining ioctls are changing the state of the
6942 * superblock, so we do not allow them on read-only arrays.
6944 if (mddev->ro && mddev->pers) {
6945 if (mddev->ro == 2) {
6947 sysfs_notify_dirent_safe(mddev->sysfs_state);
6948 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6949 /* mddev_unlock will wake thread */
6950 /* If a device failed while we were read-only, we
6951 * need to make sure the metadata is updated now.
6953 if (test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
6954 mddev_unlock(mddev);
6955 wait_event(mddev->sb_wait,
6956 !test_bit(MD_CHANGE_DEVS, &mddev->flags) &&
6957 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
6958 mddev_lock_nointr(mddev);
6969 mdu_disk_info_t info;
6970 if (copy_from_user(&info, argp, sizeof(info)))
6973 err = add_new_disk(mddev, &info);
6977 case CLUSTERED_DISK_NACK:
6978 if (mddev_is_clustered(mddev))
6979 md_cluster_ops->new_disk_ack(mddev, false);
6985 err = hot_add_disk(mddev, new_decode_dev(arg));
6989 err = do_md_run(mddev);
6992 case SET_BITMAP_FILE:
6993 err = set_bitmap_file(mddev, (int)arg);
7002 if (mddev->hold_active == UNTIL_IOCTL &&
7004 mddev->hold_active = 0;
7005 mddev_unlock(mddev);
7009 #ifdef CONFIG_COMPAT
7010 static int md_compat_ioctl(struct block_device *bdev, fmode_t mode,
7011 unsigned int cmd, unsigned long arg)
7014 case HOT_REMOVE_DISK:
7016 case SET_DISK_FAULTY:
7017 case SET_BITMAP_FILE:
7018 /* These take in integer arg, do not convert */
7021 arg = (unsigned long)compat_ptr(arg);
7025 return md_ioctl(bdev, mode, cmd, arg);
7027 #endif /* CONFIG_COMPAT */
7029 static int md_open(struct block_device *bdev, fmode_t mode)
7032 * Succeed if we can lock the mddev, which confirms that
7033 * it isn't being stopped right now.
7035 struct mddev *mddev = mddev_find(bdev->bd_dev);
7041 if (mddev->gendisk != bdev->bd_disk) {
7042 /* we are racing with mddev_put which is discarding this
7046 /* Wait until bdev->bd_disk is definitely gone */
7047 flush_workqueue(md_misc_wq);
7048 /* Then retry the open from the top */
7049 return -ERESTARTSYS;
7051 BUG_ON(mddev != bdev->bd_disk->private_data);
7053 if ((err = mutex_lock_interruptible(&mddev->open_mutex)))
7056 if (test_bit(MD_CLOSING, &mddev->flags)) {
7057 mutex_unlock(&mddev->open_mutex);
7062 atomic_inc(&mddev->openers);
7063 mutex_unlock(&mddev->open_mutex);
7065 check_disk_change(bdev);
7070 static void md_release(struct gendisk *disk, fmode_t mode)
7072 struct mddev *mddev = disk->private_data;
7075 atomic_dec(&mddev->openers);
7079 static int md_media_changed(struct gendisk *disk)
7081 struct mddev *mddev = disk->private_data;
7083 return mddev->changed;
7086 static int md_revalidate(struct gendisk *disk)
7088 struct mddev *mddev = disk->private_data;
7093 static const struct block_device_operations md_fops =
7095 .owner = THIS_MODULE,
7097 .release = md_release,
7099 #ifdef CONFIG_COMPAT
7100 .compat_ioctl = md_compat_ioctl,
7102 .getgeo = md_getgeo,
7103 .media_changed = md_media_changed,
7104 .revalidate_disk= md_revalidate,
7107 static int md_thread(void *arg)
7109 struct md_thread *thread = arg;
7112 * md_thread is a 'system-thread', it's priority should be very
7113 * high. We avoid resource deadlocks individually in each
7114 * raid personality. (RAID5 does preallocation) We also use RR and
7115 * the very same RT priority as kswapd, thus we will never get
7116 * into a priority inversion deadlock.
7118 * we definitely have to have equal or higher priority than
7119 * bdflush, otherwise bdflush will deadlock if there are too
7120 * many dirty RAID5 blocks.
7123 allow_signal(SIGKILL);
7124 while (!kthread_should_stop()) {
7126 /* We need to wait INTERRUPTIBLE so that
7127 * we don't add to the load-average.
7128 * That means we need to be sure no signals are
7131 if (signal_pending(current))
7132 flush_signals(current);
7134 wait_event_interruptible_timeout
7136 test_bit(THREAD_WAKEUP, &thread->flags)
7137 || kthread_should_stop(),
7140 clear_bit(THREAD_WAKEUP, &thread->flags);
7141 if (!kthread_should_stop())
7142 thread->run(thread);
7148 void md_wakeup_thread(struct md_thread *thread)
7151 pr_debug("md: waking up MD thread %s.\n", thread->tsk->comm);
7152 set_bit(THREAD_WAKEUP, &thread->flags);
7153 wake_up(&thread->wqueue);
7156 EXPORT_SYMBOL(md_wakeup_thread);
7158 struct md_thread *md_register_thread(void (*run) (struct md_thread *),
7159 struct mddev *mddev, const char *name)
7161 struct md_thread *thread;
7163 thread = kzalloc(sizeof(struct md_thread), GFP_KERNEL);
7167 init_waitqueue_head(&thread->wqueue);
7170 thread->mddev = mddev;
7171 thread->timeout = MAX_SCHEDULE_TIMEOUT;
7172 thread->tsk = kthread_run(md_thread, thread,
7174 mdname(thread->mddev),
7176 if (IS_ERR(thread->tsk)) {
7182 EXPORT_SYMBOL(md_register_thread);
7184 void md_unregister_thread(struct md_thread **threadp)
7186 struct md_thread *thread = *threadp;
7189 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
7190 /* Locking ensures that mddev_unlock does not wake_up a
7191 * non-existent thread
7193 spin_lock(&pers_lock);
7195 spin_unlock(&pers_lock);
7197 kthread_stop(thread->tsk);
7200 EXPORT_SYMBOL(md_unregister_thread);
7202 void md_error(struct mddev *mddev, struct md_rdev *rdev)
7204 if (!rdev || test_bit(Faulty, &rdev->flags))
7207 if (!mddev->pers || !mddev->pers->error_handler)
7209 mddev->pers->error_handler(mddev,rdev);
7210 if (mddev->degraded)
7211 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7212 sysfs_notify_dirent_safe(rdev->sysfs_state);
7213 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7214 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7215 md_wakeup_thread(mddev->thread);
7216 if (mddev->event_work.func)
7217 queue_work(md_misc_wq, &mddev->event_work);
7218 md_new_event(mddev);
7220 EXPORT_SYMBOL(md_error);
7222 /* seq_file implementation /proc/mdstat */
7224 static void status_unused(struct seq_file *seq)
7227 struct md_rdev *rdev;
7229 seq_printf(seq, "unused devices: ");
7231 list_for_each_entry(rdev, &pending_raid_disks, same_set) {
7232 char b[BDEVNAME_SIZE];
7234 seq_printf(seq, "%s ",
7235 bdevname(rdev->bdev,b));
7238 seq_printf(seq, "<none>");
7240 seq_printf(seq, "\n");
7243 static int status_resync(struct seq_file *seq, struct mddev *mddev)
7245 sector_t max_sectors, resync, res;
7246 unsigned long dt, db;
7249 unsigned int per_milli;
7251 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
7252 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
7253 max_sectors = mddev->resync_max_sectors;
7255 max_sectors = mddev->dev_sectors;
7257 resync = mddev->curr_resync;
7259 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
7260 /* Still cleaning up */
7261 resync = max_sectors;
7263 resync -= atomic_read(&mddev->recovery_active);
7266 if (mddev->recovery_cp < MaxSector) {
7267 seq_printf(seq, "\tresync=PENDING");
7273 seq_printf(seq, "\tresync=DELAYED");
7277 WARN_ON(max_sectors == 0);
7278 /* Pick 'scale' such that (resync>>scale)*1000 will fit
7279 * in a sector_t, and (max_sectors>>scale) will fit in a
7280 * u32, as those are the requirements for sector_div.
7281 * Thus 'scale' must be at least 10
7284 if (sizeof(sector_t) > sizeof(unsigned long)) {
7285 while ( max_sectors/2 > (1ULL<<(scale+32)))
7288 res = (resync>>scale)*1000;
7289 sector_div(res, (u32)((max_sectors>>scale)+1));
7293 int i, x = per_milli/50, y = 20-x;
7294 seq_printf(seq, "[");
7295 for (i = 0; i < x; i++)
7296 seq_printf(seq, "=");
7297 seq_printf(seq, ">");
7298 for (i = 0; i < y; i++)
7299 seq_printf(seq, ".");
7300 seq_printf(seq, "] ");
7302 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
7303 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
7305 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
7307 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
7308 "resync" : "recovery"))),
7309 per_milli/10, per_milli % 10,
7310 (unsigned long long) resync/2,
7311 (unsigned long long) max_sectors/2);
7314 * dt: time from mark until now
7315 * db: blocks written from mark until now
7316 * rt: remaining time
7318 * rt is a sector_t, so could be 32bit or 64bit.
7319 * So we divide before multiply in case it is 32bit and close
7321 * We scale the divisor (db) by 32 to avoid losing precision
7322 * near the end of resync when the number of remaining sectors
7324 * We then divide rt by 32 after multiplying by db to compensate.
7325 * The '+1' avoids division by zero if db is very small.
7327 dt = ((jiffies - mddev->resync_mark) / HZ);
7329 db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active))
7330 - mddev->resync_mark_cnt;
7332 rt = max_sectors - resync; /* number of remaining sectors */
7333 sector_div(rt, db/32+1);
7337 seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60,
7338 ((unsigned long)rt % 60)/6);
7340 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
7344 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
7346 struct list_head *tmp;
7348 struct mddev *mddev;
7356 spin_lock(&all_mddevs_lock);
7357 list_for_each(tmp,&all_mddevs)
7359 mddev = list_entry(tmp, struct mddev, all_mddevs);
7361 spin_unlock(&all_mddevs_lock);
7364 spin_unlock(&all_mddevs_lock);
7366 return (void*)2;/* tail */
7370 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
7372 struct list_head *tmp;
7373 struct mddev *next_mddev, *mddev = v;
7379 spin_lock(&all_mddevs_lock);
7381 tmp = all_mddevs.next;
7383 tmp = mddev->all_mddevs.next;
7384 if (tmp != &all_mddevs)
7385 next_mddev = mddev_get(list_entry(tmp,struct mddev,all_mddevs));
7387 next_mddev = (void*)2;
7390 spin_unlock(&all_mddevs_lock);
7398 static void md_seq_stop(struct seq_file *seq, void *v)
7400 struct mddev *mddev = v;
7402 if (mddev && v != (void*)1 && v != (void*)2)
7406 static int md_seq_show(struct seq_file *seq, void *v)
7408 struct mddev *mddev = v;
7410 struct md_rdev *rdev;
7412 if (v == (void*)1) {
7413 struct md_personality *pers;
7414 seq_printf(seq, "Personalities : ");
7415 spin_lock(&pers_lock);
7416 list_for_each_entry(pers, &pers_list, list)
7417 seq_printf(seq, "[%s] ", pers->name);
7419 spin_unlock(&pers_lock);
7420 seq_printf(seq, "\n");
7421 seq->poll_event = atomic_read(&md_event_count);
7424 if (v == (void*)2) {
7429 spin_lock(&mddev->lock);
7430 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
7431 seq_printf(seq, "%s : %sactive", mdname(mddev),
7432 mddev->pers ? "" : "in");
7435 seq_printf(seq, " (read-only)");
7437 seq_printf(seq, " (auto-read-only)");
7438 seq_printf(seq, " %s", mddev->pers->name);
7443 rdev_for_each_rcu(rdev, mddev) {
7444 char b[BDEVNAME_SIZE];
7445 seq_printf(seq, " %s[%d]",
7446 bdevname(rdev->bdev,b), rdev->desc_nr);
7447 if (test_bit(WriteMostly, &rdev->flags))
7448 seq_printf(seq, "(W)");
7449 if (test_bit(Journal, &rdev->flags))
7450 seq_printf(seq, "(J)");
7451 if (test_bit(Faulty, &rdev->flags)) {
7452 seq_printf(seq, "(F)");
7455 if (rdev->raid_disk < 0)
7456 seq_printf(seq, "(S)"); /* spare */
7457 if (test_bit(Replacement, &rdev->flags))
7458 seq_printf(seq, "(R)");
7459 sectors += rdev->sectors;
7463 if (!list_empty(&mddev->disks)) {
7465 seq_printf(seq, "\n %llu blocks",
7466 (unsigned long long)
7467 mddev->array_sectors / 2);
7469 seq_printf(seq, "\n %llu blocks",
7470 (unsigned long long)sectors / 2);
7472 if (mddev->persistent) {
7473 if (mddev->major_version != 0 ||
7474 mddev->minor_version != 90) {
7475 seq_printf(seq," super %d.%d",
7476 mddev->major_version,
7477 mddev->minor_version);
7479 } else if (mddev->external)
7480 seq_printf(seq, " super external:%s",
7481 mddev->metadata_type);
7483 seq_printf(seq, " super non-persistent");
7486 mddev->pers->status(seq, mddev);
7487 seq_printf(seq, "\n ");
7488 if (mddev->pers->sync_request) {
7489 if (status_resync(seq, mddev))
7490 seq_printf(seq, "\n ");
7493 seq_printf(seq, "\n ");
7495 bitmap_status(seq, mddev->bitmap);
7497 seq_printf(seq, "\n");
7499 spin_unlock(&mddev->lock);
7504 static const struct seq_operations md_seq_ops = {
7505 .start = md_seq_start,
7506 .next = md_seq_next,
7507 .stop = md_seq_stop,
7508 .show = md_seq_show,
7511 static int md_seq_open(struct inode *inode, struct file *file)
7513 struct seq_file *seq;
7516 error = seq_open(file, &md_seq_ops);
7520 seq = file->private_data;
7521 seq->poll_event = atomic_read(&md_event_count);
7525 static int md_unloading;
7526 static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
7528 struct seq_file *seq = filp->private_data;
7532 return POLLIN|POLLRDNORM|POLLERR|POLLPRI;
7533 poll_wait(filp, &md_event_waiters, wait);
7535 /* always allow read */
7536 mask = POLLIN | POLLRDNORM;
7538 if (seq->poll_event != atomic_read(&md_event_count))
7539 mask |= POLLERR | POLLPRI;
7543 static const struct file_operations md_seq_fops = {
7544 .owner = THIS_MODULE,
7545 .open = md_seq_open,
7547 .llseek = seq_lseek,
7548 .release = seq_release_private,
7549 .poll = mdstat_poll,
7552 int register_md_personality(struct md_personality *p)
7554 pr_debug("md: %s personality registered for level %d\n",
7556 spin_lock(&pers_lock);
7557 list_add_tail(&p->list, &pers_list);
7558 spin_unlock(&pers_lock);
7561 EXPORT_SYMBOL(register_md_personality);
7563 int unregister_md_personality(struct md_personality *p)
7565 pr_debug("md: %s personality unregistered\n", p->name);
7566 spin_lock(&pers_lock);
7567 list_del_init(&p->list);
7568 spin_unlock(&pers_lock);
7571 EXPORT_SYMBOL(unregister_md_personality);
7573 int register_md_cluster_operations(struct md_cluster_operations *ops,
7574 struct module *module)
7577 spin_lock(&pers_lock);
7578 if (md_cluster_ops != NULL)
7581 md_cluster_ops = ops;
7582 md_cluster_mod = module;
7584 spin_unlock(&pers_lock);
7587 EXPORT_SYMBOL(register_md_cluster_operations);
7589 int unregister_md_cluster_operations(void)
7591 spin_lock(&pers_lock);
7592 md_cluster_ops = NULL;
7593 spin_unlock(&pers_lock);
7596 EXPORT_SYMBOL(unregister_md_cluster_operations);
7598 int md_setup_cluster(struct mddev *mddev, int nodes)
7600 if (!md_cluster_ops)
7601 request_module("md-cluster");
7602 spin_lock(&pers_lock);
7603 /* ensure module won't be unloaded */
7604 if (!md_cluster_ops || !try_module_get(md_cluster_mod)) {
7605 pr_warn("can't find md-cluster module or get it's reference.\n");
7606 spin_unlock(&pers_lock);
7609 spin_unlock(&pers_lock);
7611 return md_cluster_ops->join(mddev, nodes);
7614 void md_cluster_stop(struct mddev *mddev)
7616 if (!md_cluster_ops)
7618 md_cluster_ops->leave(mddev);
7619 module_put(md_cluster_mod);
7622 static int is_mddev_idle(struct mddev *mddev, int init)
7624 struct md_rdev *rdev;
7630 rdev_for_each_rcu(rdev, mddev) {
7631 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
7632 curr_events = (int)part_stat_read(&disk->part0, sectors[0]) +
7633 (int)part_stat_read(&disk->part0, sectors[1]) -
7634 atomic_read(&disk->sync_io);
7635 /* sync IO will cause sync_io to increase before the disk_stats
7636 * as sync_io is counted when a request starts, and
7637 * disk_stats is counted when it completes.
7638 * So resync activity will cause curr_events to be smaller than
7639 * when there was no such activity.
7640 * non-sync IO will cause disk_stat to increase without
7641 * increasing sync_io so curr_events will (eventually)
7642 * be larger than it was before. Once it becomes
7643 * substantially larger, the test below will cause
7644 * the array to appear non-idle, and resync will slow
7646 * If there is a lot of outstanding resync activity when
7647 * we set last_event to curr_events, then all that activity
7648 * completing might cause the array to appear non-idle
7649 * and resync will be slowed down even though there might
7650 * not have been non-resync activity. This will only
7651 * happen once though. 'last_events' will soon reflect
7652 * the state where there is little or no outstanding
7653 * resync requests, and further resync activity will
7654 * always make curr_events less than last_events.
7657 if (init || curr_events - rdev->last_events > 64) {
7658 rdev->last_events = curr_events;
7666 void md_done_sync(struct mddev *mddev, int blocks, int ok)
7668 /* another "blocks" (512byte) blocks have been synced */
7669 atomic_sub(blocks, &mddev->recovery_active);
7670 wake_up(&mddev->recovery_wait);
7672 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7673 set_bit(MD_RECOVERY_ERROR, &mddev->recovery);
7674 md_wakeup_thread(mddev->thread);
7675 // stop recovery, signal do_sync ....
7678 EXPORT_SYMBOL(md_done_sync);
7680 /* md_write_start(mddev, bi)
7681 * If we need to update some array metadata (e.g. 'active' flag
7682 * in superblock) before writing, schedule a superblock update
7683 * and wait for it to complete.
7685 void md_write_start(struct mddev *mddev, struct bio *bi)
7688 if (bio_data_dir(bi) != WRITE)
7691 BUG_ON(mddev->ro == 1);
7692 if (mddev->ro == 2) {
7693 /* need to switch to read/write */
7695 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7696 md_wakeup_thread(mddev->thread);
7697 md_wakeup_thread(mddev->sync_thread);
7700 atomic_inc(&mddev->writes_pending);
7701 if (mddev->safemode == 1)
7702 mddev->safemode = 0;
7703 if (mddev->in_sync) {
7704 spin_lock(&mddev->lock);
7705 if (mddev->in_sync) {
7707 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
7708 set_bit(MD_CHANGE_PENDING, &mddev->flags);
7709 md_wakeup_thread(mddev->thread);
7712 spin_unlock(&mddev->lock);
7715 sysfs_notify_dirent_safe(mddev->sysfs_state);
7716 wait_event(mddev->sb_wait,
7717 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
7719 EXPORT_SYMBOL(md_write_start);
7721 void md_write_end(struct mddev *mddev)
7723 if (atomic_dec_and_test(&mddev->writes_pending)) {
7724 if (mddev->safemode == 2)
7725 md_wakeup_thread(mddev->thread);
7726 else if (mddev->safemode_delay)
7727 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
7730 EXPORT_SYMBOL(md_write_end);
7732 /* md_allow_write(mddev)
7733 * Calling this ensures that the array is marked 'active' so that writes
7734 * may proceed without blocking. It is important to call this before
7735 * attempting a GFP_KERNEL allocation while holding the mddev lock.
7736 * Must be called with mddev_lock held.
7738 * In the ->external case MD_CHANGE_PENDING can not be cleared until mddev->lock
7739 * is dropped, so return -EAGAIN after notifying userspace.
7741 int md_allow_write(struct mddev *mddev)
7747 if (!mddev->pers->sync_request)
7750 spin_lock(&mddev->lock);
7751 if (mddev->in_sync) {
7753 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
7754 set_bit(MD_CHANGE_PENDING, &mddev->flags);
7755 if (mddev->safemode_delay &&
7756 mddev->safemode == 0)
7757 mddev->safemode = 1;
7758 spin_unlock(&mddev->lock);
7759 md_update_sb(mddev, 0);
7760 sysfs_notify_dirent_safe(mddev->sysfs_state);
7762 spin_unlock(&mddev->lock);
7764 if (test_bit(MD_CHANGE_PENDING, &mddev->flags))
7769 EXPORT_SYMBOL_GPL(md_allow_write);
7771 #define SYNC_MARKS 10
7772 #define SYNC_MARK_STEP (3*HZ)
7773 #define UPDATE_FREQUENCY (5*60*HZ)
7774 void md_do_sync(struct md_thread *thread)
7776 struct mddev *mddev = thread->mddev;
7777 struct mddev *mddev2;
7778 unsigned int currspeed = 0,
7780 sector_t max_sectors,j, io_sectors, recovery_done;
7781 unsigned long mark[SYNC_MARKS];
7782 unsigned long update_time;
7783 sector_t mark_cnt[SYNC_MARKS];
7785 struct list_head *tmp;
7786 sector_t last_check;
7788 struct md_rdev *rdev;
7789 char *desc, *action = NULL;
7790 struct blk_plug plug;
7793 /* just incase thread restarts... */
7794 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
7796 if (mddev->ro) {/* never try to sync a read-only array */
7797 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7801 if (mddev_is_clustered(mddev)) {
7802 ret = md_cluster_ops->resync_start(mddev);
7806 set_bit(MD_CLUSTER_RESYNC_LOCKED, &mddev->flags);
7807 if (!(test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
7808 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) ||
7809 test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
7810 && ((unsigned long long)mddev->curr_resync_completed
7811 < (unsigned long long)mddev->resync_max_sectors))
7815 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
7816 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) {
7817 desc = "data-check";
7819 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
7820 desc = "requested-resync";
7824 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
7829 mddev->last_sync_action = action ?: desc;
7831 /* we overload curr_resync somewhat here.
7832 * 0 == not engaged in resync at all
7833 * 2 == checking that there is no conflict with another sync
7834 * 1 == like 2, but have yielded to allow conflicting resync to
7836 * other == active in resync - this many blocks
7838 * Before starting a resync we must have set curr_resync to
7839 * 2, and then checked that every "conflicting" array has curr_resync
7840 * less than ours. When we find one that is the same or higher
7841 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
7842 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
7843 * This will mean we have to start checking from the beginning again.
7848 int mddev2_minor = -1;
7849 mddev->curr_resync = 2;
7852 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
7854 for_each_mddev(mddev2, tmp) {
7855 if (mddev2 == mddev)
7857 if (!mddev->parallel_resync
7858 && mddev2->curr_resync
7859 && match_mddev_units(mddev, mddev2)) {
7861 if (mddev < mddev2 && mddev->curr_resync == 2) {
7862 /* arbitrarily yield */
7863 mddev->curr_resync = 1;
7864 wake_up(&resync_wait);
7866 if (mddev > mddev2 && mddev->curr_resync == 1)
7867 /* no need to wait here, we can wait the next
7868 * time 'round when curr_resync == 2
7871 /* We need to wait 'interruptible' so as not to
7872 * contribute to the load average, and not to
7873 * be caught by 'softlockup'
7875 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
7876 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
7877 mddev2->curr_resync >= mddev->curr_resync) {
7878 if (mddev2_minor != mddev2->md_minor) {
7879 mddev2_minor = mddev2->md_minor;
7880 pr_info("md: delaying %s of %s until %s has finished (they share one or more physical units)\n",
7881 desc, mdname(mddev),
7885 if (signal_pending(current))
7886 flush_signals(current);
7888 finish_wait(&resync_wait, &wq);
7891 finish_wait(&resync_wait, &wq);
7894 } while (mddev->curr_resync < 2);
7897 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
7898 /* resync follows the size requested by the personality,
7899 * which defaults to physical size, but can be virtual size
7901 max_sectors = mddev->resync_max_sectors;
7902 atomic64_set(&mddev->resync_mismatches, 0);
7903 /* we don't use the checkpoint if there's a bitmap */
7904 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
7905 j = mddev->resync_min;
7906 else if (!mddev->bitmap)
7907 j = mddev->recovery_cp;
7909 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
7910 max_sectors = mddev->resync_max_sectors;
7912 /* recovery follows the physical size of devices */
7913 max_sectors = mddev->dev_sectors;
7916 rdev_for_each_rcu(rdev, mddev)
7917 if (rdev->raid_disk >= 0 &&
7918 !test_bit(Journal, &rdev->flags) &&
7919 !test_bit(Faulty, &rdev->flags) &&
7920 !test_bit(In_sync, &rdev->flags) &&
7921 rdev->recovery_offset < j)
7922 j = rdev->recovery_offset;
7925 /* If there is a bitmap, we need to make sure all
7926 * writes that started before we added a spare
7927 * complete before we start doing a recovery.
7928 * Otherwise the write might complete and (via
7929 * bitmap_endwrite) set a bit in the bitmap after the
7930 * recovery has checked that bit and skipped that
7933 if (mddev->bitmap) {
7934 mddev->pers->quiesce(mddev, 1);
7935 mddev->pers->quiesce(mddev, 0);
7939 pr_info("md: %s of RAID array %s\n", desc, mdname(mddev));
7940 pr_debug("md: minimum _guaranteed_ speed: %d KB/sec/disk.\n", speed_min(mddev));
7941 pr_debug("md: using maximum available idle IO bandwidth (but not more than %d KB/sec) for %s.\n",
7942 speed_max(mddev), desc);
7944 is_mddev_idle(mddev, 1); /* this initializes IO event counters */
7947 for (m = 0; m < SYNC_MARKS; m++) {
7949 mark_cnt[m] = io_sectors;
7952 mddev->resync_mark = mark[last_mark];
7953 mddev->resync_mark_cnt = mark_cnt[last_mark];
7956 * Tune reconstruction:
7958 window = 32*(PAGE_SIZE/512);
7959 pr_debug("md: using %dk window, over a total of %lluk.\n",
7960 window/2, (unsigned long long)max_sectors/2);
7962 atomic_set(&mddev->recovery_active, 0);
7966 pr_debug("md: resuming %s of %s from checkpoint.\n",
7967 desc, mdname(mddev));
7968 mddev->curr_resync = j;
7970 mddev->curr_resync = 3; /* no longer delayed */
7971 mddev->curr_resync_completed = j;
7972 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
7973 md_new_event(mddev);
7974 update_time = jiffies;
7976 blk_start_plug(&plug);
7977 while (j < max_sectors) {
7982 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
7983 ((mddev->curr_resync > mddev->curr_resync_completed &&
7984 (mddev->curr_resync - mddev->curr_resync_completed)
7985 > (max_sectors >> 4)) ||
7986 time_after_eq(jiffies, update_time + UPDATE_FREQUENCY) ||
7987 (j - mddev->curr_resync_completed)*2
7988 >= mddev->resync_max - mddev->curr_resync_completed ||
7989 mddev->curr_resync_completed > mddev->resync_max
7991 /* time to update curr_resync_completed */
7992 wait_event(mddev->recovery_wait,
7993 atomic_read(&mddev->recovery_active) == 0);
7994 mddev->curr_resync_completed = j;
7995 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) &&
7996 j > mddev->recovery_cp)
7997 mddev->recovery_cp = j;
7998 update_time = jiffies;
7999 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
8000 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
8003 while (j >= mddev->resync_max &&
8004 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
8005 /* As this condition is controlled by user-space,
8006 * we can block indefinitely, so use '_interruptible'
8007 * to avoid triggering warnings.
8009 flush_signals(current); /* just in case */
8010 wait_event_interruptible(mddev->recovery_wait,
8011 mddev->resync_max > j
8012 || test_bit(MD_RECOVERY_INTR,
8016 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8019 sectors = mddev->pers->sync_request(mddev, j, &skipped);
8021 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8025 if (!skipped) { /* actual IO requested */
8026 io_sectors += sectors;
8027 atomic_add(sectors, &mddev->recovery_active);
8030 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8034 if (j > max_sectors)
8035 /* when skipping, extra large numbers can be returned. */
8038 mddev->curr_resync = j;
8039 mddev->curr_mark_cnt = io_sectors;
8040 if (last_check == 0)
8041 /* this is the earliest that rebuild will be
8042 * visible in /proc/mdstat
8044 md_new_event(mddev);
8046 if (last_check + window > io_sectors || j == max_sectors)
8049 last_check = io_sectors;
8051 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
8053 int next = (last_mark+1) % SYNC_MARKS;
8055 mddev->resync_mark = mark[next];
8056 mddev->resync_mark_cnt = mark_cnt[next];
8057 mark[next] = jiffies;
8058 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
8062 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8066 * this loop exits only if either when we are slower than
8067 * the 'hard' speed limit, or the system was IO-idle for
8069 * the system might be non-idle CPU-wise, but we only care
8070 * about not overloading the IO subsystem. (things like an
8071 * e2fsck being done on the RAID array should execute fast)
8075 recovery_done = io_sectors - atomic_read(&mddev->recovery_active);
8076 currspeed = ((unsigned long)(recovery_done - mddev->resync_mark_cnt))/2
8077 /((jiffies-mddev->resync_mark)/HZ +1) +1;
8079 if (currspeed > speed_min(mddev)) {
8080 if (currspeed > speed_max(mddev)) {
8084 if (!is_mddev_idle(mddev, 0)) {
8086 * Give other IO more of a chance.
8087 * The faster the devices, the less we wait.
8089 wait_event(mddev->recovery_wait,
8090 !atomic_read(&mddev->recovery_active));
8094 pr_info("md: %s: %s %s.\n",mdname(mddev), desc,
8095 test_bit(MD_RECOVERY_INTR, &mddev->recovery)
8096 ? "interrupted" : "done");
8098 * this also signals 'finished resyncing' to md_stop
8100 blk_finish_plug(&plug);
8101 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
8103 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8104 !test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8105 mddev->curr_resync > 3) {
8106 mddev->curr_resync_completed = mddev->curr_resync;
8107 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
8109 mddev->pers->sync_request(mddev, max_sectors, &skipped);
8111 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
8112 mddev->curr_resync > 3) {
8113 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
8114 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
8115 if (mddev->curr_resync >= mddev->recovery_cp) {
8116 pr_debug("md: checkpointing %s of %s.\n",
8117 desc, mdname(mddev));
8118 if (test_bit(MD_RECOVERY_ERROR,
8120 mddev->recovery_cp =
8121 mddev->curr_resync_completed;
8123 mddev->recovery_cp =
8127 mddev->recovery_cp = MaxSector;
8129 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8130 mddev->curr_resync = MaxSector;
8132 rdev_for_each_rcu(rdev, mddev)
8133 if (rdev->raid_disk >= 0 &&
8134 mddev->delta_disks >= 0 &&
8135 !test_bit(Journal, &rdev->flags) &&
8136 !test_bit(Faulty, &rdev->flags) &&
8137 !test_bit(In_sync, &rdev->flags) &&
8138 rdev->recovery_offset < mddev->curr_resync)
8139 rdev->recovery_offset = mddev->curr_resync;
8144 /* set CHANGE_PENDING here since maybe another update is needed,
8145 * so other nodes are informed. It should be harmless for normal
8147 set_mask_bits(&mddev->flags, 0,
8148 BIT(MD_CHANGE_PENDING) | BIT(MD_CHANGE_DEVS));
8150 spin_lock(&mddev->lock);
8151 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
8152 /* We completed so min/max setting can be forgotten if used. */
8153 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
8154 mddev->resync_min = 0;
8155 mddev->resync_max = MaxSector;
8156 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
8157 mddev->resync_min = mddev->curr_resync_completed;
8158 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
8159 mddev->curr_resync = 0;
8160 spin_unlock(&mddev->lock);
8162 wake_up(&resync_wait);
8163 md_wakeup_thread(mddev->thread);
8166 EXPORT_SYMBOL_GPL(md_do_sync);
8168 static int remove_and_add_spares(struct mddev *mddev,
8169 struct md_rdev *this)
8171 struct md_rdev *rdev;
8174 bool remove_some = false;
8176 rdev_for_each(rdev, mddev) {
8177 if ((this == NULL || rdev == this) &&
8178 rdev->raid_disk >= 0 &&
8179 !test_bit(Blocked, &rdev->flags) &&
8180 test_bit(Faulty, &rdev->flags) &&
8181 atomic_read(&rdev->nr_pending)==0) {
8182 /* Faulty non-Blocked devices with nr_pending == 0
8183 * never get nr_pending incremented,
8184 * never get Faulty cleared, and never get Blocked set.
8185 * So we can synchronize_rcu now rather than once per device
8188 set_bit(RemoveSynchronized, &rdev->flags);
8194 rdev_for_each(rdev, mddev) {
8195 if ((this == NULL || rdev == this) &&
8196 rdev->raid_disk >= 0 &&
8197 !test_bit(Blocked, &rdev->flags) &&
8198 ((test_bit(RemoveSynchronized, &rdev->flags) ||
8199 (!test_bit(In_sync, &rdev->flags) &&
8200 !test_bit(Journal, &rdev->flags))) &&
8201 atomic_read(&rdev->nr_pending)==0)) {
8202 if (mddev->pers->hot_remove_disk(
8203 mddev, rdev) == 0) {
8204 sysfs_unlink_rdev(mddev, rdev);
8205 rdev->raid_disk = -1;
8209 if (remove_some && test_bit(RemoveSynchronized, &rdev->flags))
8210 clear_bit(RemoveSynchronized, &rdev->flags);
8213 if (removed && mddev->kobj.sd)
8214 sysfs_notify(&mddev->kobj, NULL, "degraded");
8216 if (this && removed)
8219 rdev_for_each(rdev, mddev) {
8220 if (this && this != rdev)
8222 if (test_bit(Candidate, &rdev->flags))
8224 if (rdev->raid_disk >= 0 &&
8225 !test_bit(In_sync, &rdev->flags) &&
8226 !test_bit(Journal, &rdev->flags) &&
8227 !test_bit(Faulty, &rdev->flags))
8229 if (rdev->raid_disk >= 0)
8231 if (test_bit(Faulty, &rdev->flags))
8233 if (!test_bit(Journal, &rdev->flags)) {
8235 ! (rdev->saved_raid_disk >= 0 &&
8236 !test_bit(Bitmap_sync, &rdev->flags)))
8239 rdev->recovery_offset = 0;
8242 hot_add_disk(mddev, rdev) == 0) {
8243 if (sysfs_link_rdev(mddev, rdev))
8244 /* failure here is OK */;
8245 if (!test_bit(Journal, &rdev->flags))
8247 md_new_event(mddev);
8248 set_bit(MD_CHANGE_DEVS, &mddev->flags);
8253 set_bit(MD_CHANGE_DEVS, &mddev->flags);
8257 static void md_start_sync(struct work_struct *ws)
8259 struct mddev *mddev = container_of(ws, struct mddev, del_work);
8261 mddev->sync_thread = md_register_thread(md_do_sync,
8264 if (!mddev->sync_thread) {
8265 pr_warn("%s: could not start resync thread...\n",
8267 /* leave the spares where they are, it shouldn't hurt */
8268 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8269 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
8270 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
8271 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
8272 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
8273 wake_up(&resync_wait);
8274 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
8276 if (mddev->sysfs_action)
8277 sysfs_notify_dirent_safe(mddev->sysfs_action);
8279 md_wakeup_thread(mddev->sync_thread);
8280 sysfs_notify_dirent_safe(mddev->sysfs_action);
8281 md_new_event(mddev);
8285 * This routine is regularly called by all per-raid-array threads to
8286 * deal with generic issues like resync and super-block update.
8287 * Raid personalities that don't have a thread (linear/raid0) do not
8288 * need this as they never do any recovery or update the superblock.
8290 * It does not do any resync itself, but rather "forks" off other threads
8291 * to do that as needed.
8292 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
8293 * "->recovery" and create a thread at ->sync_thread.
8294 * When the thread finishes it sets MD_RECOVERY_DONE
8295 * and wakeups up this thread which will reap the thread and finish up.
8296 * This thread also removes any faulty devices (with nr_pending == 0).
8298 * The overall approach is:
8299 * 1/ if the superblock needs updating, update it.
8300 * 2/ If a recovery thread is running, don't do anything else.
8301 * 3/ If recovery has finished, clean up, possibly marking spares active.
8302 * 4/ If there are any faulty devices, remove them.
8303 * 5/ If array is degraded, try to add spares devices
8304 * 6/ If array has spares or is not in-sync, start a resync thread.
8306 void md_check_recovery(struct mddev *mddev)
8308 if (mddev->suspended)
8312 bitmap_daemon_work(mddev);
8314 if (signal_pending(current)) {
8315 if (mddev->pers->sync_request && !mddev->external) {
8316 pr_debug("md: %s in immediate safe mode\n",
8318 mddev->safemode = 2;
8320 flush_signals(current);
8323 if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
8326 (mddev->flags & MD_UPDATE_SB_FLAGS & ~ (1<<MD_CHANGE_PENDING)) ||
8327 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
8328 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
8329 test_bit(MD_RELOAD_SB, &mddev->flags) ||
8330 (mddev->external == 0 && mddev->safemode == 1) ||
8331 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
8332 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
8336 if (mddev_trylock(mddev)) {
8340 struct md_rdev *rdev;
8341 if (!mddev->external && mddev->in_sync)
8342 /* 'Blocked' flag not needed as failed devices
8343 * will be recorded if array switched to read/write.
8344 * Leaving it set will prevent the device
8345 * from being removed.
8347 rdev_for_each(rdev, mddev)
8348 clear_bit(Blocked, &rdev->flags);
8349 /* On a read-only array we can:
8350 * - remove failed devices
8351 * - add already-in_sync devices if the array itself
8353 * As we only add devices that are already in-sync,
8354 * we can activate the spares immediately.
8356 remove_and_add_spares(mddev, NULL);
8357 /* There is no thread, but we need to call
8358 * ->spare_active and clear saved_raid_disk
8360 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8361 md_reap_sync_thread(mddev);
8362 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8363 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8364 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
8368 if (mddev_is_clustered(mddev)) {
8369 struct md_rdev *rdev;
8370 /* kick the device if another node issued a
8373 rdev_for_each(rdev, mddev) {
8374 if (test_and_clear_bit(ClusterRemove, &rdev->flags) &&
8375 rdev->raid_disk < 0)
8376 md_kick_rdev_from_array(rdev);
8379 if (test_and_clear_bit(MD_RELOAD_SB, &mddev->flags))
8380 md_reload_sb(mddev, mddev->good_device_nr);
8383 if (!mddev->external) {
8385 spin_lock(&mddev->lock);
8386 if (mddev->safemode &&
8387 !atomic_read(&mddev->writes_pending) &&
8389 mddev->recovery_cp == MaxSector) {
8392 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
8394 if (mddev->safemode == 1)
8395 mddev->safemode = 0;
8396 spin_unlock(&mddev->lock);
8398 sysfs_notify_dirent_safe(mddev->sysfs_state);
8401 if (mddev->flags & MD_UPDATE_SB_FLAGS)
8402 md_update_sb(mddev, 0);
8404 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
8405 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
8406 /* resync/recovery still happening */
8407 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8410 if (mddev->sync_thread) {
8411 md_reap_sync_thread(mddev);
8414 /* Set RUNNING before clearing NEEDED to avoid
8415 * any transients in the value of "sync_action".
8417 mddev->curr_resync_completed = 0;
8418 spin_lock(&mddev->lock);
8419 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
8420 spin_unlock(&mddev->lock);
8421 /* Clear some bits that don't mean anything, but
8424 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
8425 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
8427 if (!test_and_clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
8428 test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
8430 /* no recovery is running.
8431 * remove any failed drives, then
8432 * add spares if possible.
8433 * Spares are also removed and re-added, to allow
8434 * the personality to fail the re-add.
8437 if (mddev->reshape_position != MaxSector) {
8438 if (mddev->pers->check_reshape == NULL ||
8439 mddev->pers->check_reshape(mddev) != 0)
8440 /* Cannot proceed */
8442 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
8443 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8444 } else if ((spares = remove_and_add_spares(mddev, NULL))) {
8445 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8446 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
8447 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
8448 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8449 } else if (mddev->recovery_cp < MaxSector) {
8450 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8451 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8452 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
8453 /* nothing to be done ... */
8456 if (mddev->pers->sync_request) {
8458 /* We are adding a device or devices to an array
8459 * which has the bitmap stored on all devices.
8460 * So make sure all bitmap pages get written
8462 bitmap_write_all(mddev->bitmap);
8464 INIT_WORK(&mddev->del_work, md_start_sync);
8465 queue_work(md_misc_wq, &mddev->del_work);
8469 if (!mddev->sync_thread) {
8470 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
8471 wake_up(&resync_wait);
8472 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
8474 if (mddev->sysfs_action)
8475 sysfs_notify_dirent_safe(mddev->sysfs_action);
8478 wake_up(&mddev->sb_wait);
8479 mddev_unlock(mddev);
8482 EXPORT_SYMBOL(md_check_recovery);
8484 void md_reap_sync_thread(struct mddev *mddev)
8486 struct md_rdev *rdev;
8488 /* resync has finished, collect result */
8489 md_unregister_thread(&mddev->sync_thread);
8490 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8491 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
8493 /* activate any spares */
8494 if (mddev->pers->spare_active(mddev)) {
8495 sysfs_notify(&mddev->kobj, NULL,
8497 set_bit(MD_CHANGE_DEVS, &mddev->flags);
8500 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8501 mddev->pers->finish_reshape)
8502 mddev->pers->finish_reshape(mddev);
8504 /* If array is no-longer degraded, then any saved_raid_disk
8505 * information must be scrapped.
8507 if (!mddev->degraded)
8508 rdev_for_each(rdev, mddev)
8509 rdev->saved_raid_disk = -1;
8511 md_update_sb(mddev, 1);
8512 /* MD_CHANGE_PENDING should be cleared by md_update_sb, so we can
8513 * call resync_finish here if MD_CLUSTER_RESYNC_LOCKED is set by
8515 if (test_and_clear_bit(MD_CLUSTER_RESYNC_LOCKED, &mddev->flags))
8516 md_cluster_ops->resync_finish(mddev);
8517 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
8518 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
8519 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8520 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
8521 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
8522 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
8523 wake_up(&resync_wait);
8524 /* flag recovery needed just to double check */
8525 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8526 sysfs_notify_dirent_safe(mddev->sysfs_action);
8527 md_new_event(mddev);
8528 if (mddev->event_work.func)
8529 queue_work(md_misc_wq, &mddev->event_work);
8531 EXPORT_SYMBOL(md_reap_sync_thread);
8533 void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev)
8535 sysfs_notify_dirent_safe(rdev->sysfs_state);
8536 wait_event_timeout(rdev->blocked_wait,
8537 !test_bit(Blocked, &rdev->flags) &&
8538 !test_bit(BlockedBadBlocks, &rdev->flags),
8539 msecs_to_jiffies(5000));
8540 rdev_dec_pending(rdev, mddev);
8542 EXPORT_SYMBOL(md_wait_for_blocked_rdev);
8544 void md_finish_reshape(struct mddev *mddev)
8546 /* called be personality module when reshape completes. */
8547 struct md_rdev *rdev;
8549 rdev_for_each(rdev, mddev) {
8550 if (rdev->data_offset > rdev->new_data_offset)
8551 rdev->sectors += rdev->data_offset - rdev->new_data_offset;
8553 rdev->sectors -= rdev->new_data_offset - rdev->data_offset;
8554 rdev->data_offset = rdev->new_data_offset;
8557 EXPORT_SYMBOL(md_finish_reshape);
8559 /* Bad block management */
8561 /* Returns 1 on success, 0 on failure */
8562 int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
8565 struct mddev *mddev = rdev->mddev;
8568 s += rdev->new_data_offset;
8570 s += rdev->data_offset;
8571 rv = badblocks_set(&rdev->badblocks, s, sectors, 0);
8573 /* Make sure they get written out promptly */
8574 if (test_bit(ExternalBbl, &rdev->flags))
8575 sysfs_notify(&rdev->kobj, NULL,
8576 "unacknowledged_bad_blocks");
8577 sysfs_notify_dirent_safe(rdev->sysfs_state);
8578 set_mask_bits(&mddev->flags, 0,
8579 BIT(MD_CHANGE_CLEAN) | BIT(MD_CHANGE_PENDING));
8580 md_wakeup_thread(rdev->mddev->thread);
8585 EXPORT_SYMBOL_GPL(rdev_set_badblocks);
8587 int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
8592 s += rdev->new_data_offset;
8594 s += rdev->data_offset;
8595 rv = badblocks_clear(&rdev->badblocks, s, sectors);
8596 if ((rv == 0) && test_bit(ExternalBbl, &rdev->flags))
8597 sysfs_notify(&rdev->kobj, NULL, "bad_blocks");
8600 EXPORT_SYMBOL_GPL(rdev_clear_badblocks);
8602 static int md_notify_reboot(struct notifier_block *this,
8603 unsigned long code, void *x)
8605 struct list_head *tmp;
8606 struct mddev *mddev;
8609 for_each_mddev(mddev, tmp) {
8610 if (mddev_trylock(mddev)) {
8612 __md_stop_writes(mddev);
8613 if (mddev->persistent)
8614 mddev->safemode = 2;
8615 mddev_unlock(mddev);
8620 * certain more exotic SCSI devices are known to be
8621 * volatile wrt too early system reboots. While the
8622 * right place to handle this issue is the given
8623 * driver, we do want to have a safe RAID driver ...
8631 static struct notifier_block md_notifier = {
8632 .notifier_call = md_notify_reboot,
8634 .priority = INT_MAX, /* before any real devices */
8637 static void md_geninit(void)
8639 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
8641 proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops);
8644 static int __init md_init(void)
8648 md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0);
8652 md_misc_wq = alloc_workqueue("md_misc", 0, 0);
8656 if ((ret = register_blkdev(MD_MAJOR, "md")) < 0)
8659 if ((ret = register_blkdev(0, "mdp")) < 0)
8663 blk_register_region(MKDEV(MD_MAJOR, 0), 512, THIS_MODULE,
8664 md_probe, NULL, NULL);
8665 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
8666 md_probe, NULL, NULL);
8668 register_reboot_notifier(&md_notifier);
8669 raid_table_header = register_sysctl_table(raid_root_table);
8675 unregister_blkdev(MD_MAJOR, "md");
8677 destroy_workqueue(md_misc_wq);
8679 destroy_workqueue(md_wq);
8684 static void check_sb_changes(struct mddev *mddev, struct md_rdev *rdev)
8686 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
8687 struct md_rdev *rdev2;
8689 char b[BDEVNAME_SIZE];
8691 /* Check for change of roles in the active devices */
8692 rdev_for_each(rdev2, mddev) {
8693 if (test_bit(Faulty, &rdev2->flags))
8696 /* Check if the roles changed */
8697 role = le16_to_cpu(sb->dev_roles[rdev2->desc_nr]);
8699 if (test_bit(Candidate, &rdev2->flags)) {
8700 if (role == 0xfffe) {
8701 pr_info("md: Removing Candidate device %s because add failed\n", bdevname(rdev2->bdev,b));
8702 md_kick_rdev_from_array(rdev2);
8706 clear_bit(Candidate, &rdev2->flags);
8709 if (role != rdev2->raid_disk) {
8711 if (rdev2->raid_disk == -1 && role != 0xffff) {
8712 rdev2->saved_raid_disk = role;
8713 ret = remove_and_add_spares(mddev, rdev2);
8714 pr_info("Activated spare: %s\n",
8715 bdevname(rdev2->bdev,b));
8716 /* wakeup mddev->thread here, so array could
8717 * perform resync with the new activated disk */
8718 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8719 md_wakeup_thread(mddev->thread);
8723 * We just want to do the minimum to mark the disk
8724 * as faulty. The recovery is performed by the
8725 * one who initiated the error.
8727 if ((role == 0xfffe) || (role == 0xfffd)) {
8728 md_error(mddev, rdev2);
8729 clear_bit(Blocked, &rdev2->flags);
8734 if (mddev->raid_disks != le32_to_cpu(sb->raid_disks))
8735 update_raid_disks(mddev, le32_to_cpu(sb->raid_disks));
8737 /* Finally set the event to be up to date */
8738 mddev->events = le64_to_cpu(sb->events);
8741 static int read_rdev(struct mddev *mddev, struct md_rdev *rdev)
8744 struct page *swapout = rdev->sb_page;
8745 struct mdp_superblock_1 *sb;
8747 /* Store the sb page of the rdev in the swapout temporary
8748 * variable in case we err in the future
8750 rdev->sb_page = NULL;
8751 err = alloc_disk_sb(rdev);
8753 ClearPageUptodate(rdev->sb_page);
8754 rdev->sb_loaded = 0;
8755 err = super_types[mddev->major_version].
8756 load_super(rdev, NULL, mddev->minor_version);
8759 pr_warn("%s: %d Could not reload rdev(%d) err: %d. Restoring old values\n",
8760 __func__, __LINE__, rdev->desc_nr, err);
8762 put_page(rdev->sb_page);
8763 rdev->sb_page = swapout;
8764 rdev->sb_loaded = 1;
8768 sb = page_address(rdev->sb_page);
8769 /* Read the offset unconditionally, even if MD_FEATURE_RECOVERY_OFFSET
8773 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RECOVERY_OFFSET))
8774 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
8776 /* The other node finished recovery, call spare_active to set
8777 * device In_sync and mddev->degraded
8779 if (rdev->recovery_offset == MaxSector &&
8780 !test_bit(In_sync, &rdev->flags) &&
8781 mddev->pers->spare_active(mddev))
8782 sysfs_notify(&mddev->kobj, NULL, "degraded");
8788 void md_reload_sb(struct mddev *mddev, int nr)
8790 struct md_rdev *rdev;
8794 rdev_for_each_rcu(rdev, mddev) {
8795 if (rdev->desc_nr == nr)
8799 if (!rdev || rdev->desc_nr != nr) {
8800 pr_warn("%s: %d Could not find rdev with nr %d\n", __func__, __LINE__, nr);
8804 err = read_rdev(mddev, rdev);
8808 check_sb_changes(mddev, rdev);
8810 /* Read all rdev's to update recovery_offset */
8811 rdev_for_each_rcu(rdev, mddev)
8812 read_rdev(mddev, rdev);
8814 EXPORT_SYMBOL(md_reload_sb);
8819 * Searches all registered partitions for autorun RAID arrays
8823 static DEFINE_MUTEX(detected_devices_mutex);
8824 static LIST_HEAD(all_detected_devices);
8825 struct detected_devices_node {
8826 struct list_head list;
8830 void md_autodetect_dev(dev_t dev)
8832 struct detected_devices_node *node_detected_dev;
8834 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
8835 if (node_detected_dev) {
8836 node_detected_dev->dev = dev;
8837 mutex_lock(&detected_devices_mutex);
8838 list_add_tail(&node_detected_dev->list, &all_detected_devices);
8839 mutex_unlock(&detected_devices_mutex);
8843 static void autostart_arrays(int part)
8845 struct md_rdev *rdev;
8846 struct detected_devices_node *node_detected_dev;
8848 int i_scanned, i_passed;
8853 pr_info("md: Autodetecting RAID arrays.\n");
8855 mutex_lock(&detected_devices_mutex);
8856 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
8858 node_detected_dev = list_entry(all_detected_devices.next,
8859 struct detected_devices_node, list);
8860 list_del(&node_detected_dev->list);
8861 dev = node_detected_dev->dev;
8862 kfree(node_detected_dev);
8863 mutex_unlock(&detected_devices_mutex);
8864 rdev = md_import_device(dev,0, 90);
8865 mutex_lock(&detected_devices_mutex);
8869 if (test_bit(Faulty, &rdev->flags))
8872 set_bit(AutoDetected, &rdev->flags);
8873 list_add(&rdev->same_set, &pending_raid_disks);
8876 mutex_unlock(&detected_devices_mutex);
8878 pr_debug("md: Scanned %d and added %d devices.\n", i_scanned, i_passed);
8880 autorun_devices(part);
8883 #endif /* !MODULE */
8885 static __exit void md_exit(void)
8887 struct mddev *mddev;
8888 struct list_head *tmp;
8891 blk_unregister_region(MKDEV(MD_MAJOR,0), 512);
8892 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
8894 unregister_blkdev(MD_MAJOR,"md");
8895 unregister_blkdev(mdp_major, "mdp");
8896 unregister_reboot_notifier(&md_notifier);
8897 unregister_sysctl_table(raid_table_header);
8899 /* We cannot unload the modules while some process is
8900 * waiting for us in select() or poll() - wake them up
8903 while (waitqueue_active(&md_event_waiters)) {
8904 /* not safe to leave yet */
8905 wake_up(&md_event_waiters);
8909 remove_proc_entry("mdstat", NULL);
8911 for_each_mddev(mddev, tmp) {
8912 export_array(mddev);
8913 mddev->hold_active = 0;
8915 destroy_workqueue(md_misc_wq);
8916 destroy_workqueue(md_wq);
8919 subsys_initcall(md_init);
8920 module_exit(md_exit)
8922 static int get_ro(char *buffer, struct kernel_param *kp)
8924 return sprintf(buffer, "%d", start_readonly);
8926 static int set_ro(const char *val, struct kernel_param *kp)
8928 return kstrtouint(val, 10, (unsigned int *)&start_readonly);
8931 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
8932 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
8933 module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR);
8935 MODULE_LICENSE("GPL");
8936 MODULE_DESCRIPTION("MD RAID framework");
8938 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);