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.
35 #include <linux/kthread.h>
36 #include <linux/blkdev.h>
37 #include <linux/sysctl.h>
38 #include <linux/seq_file.h>
40 #include <linux/poll.h>
41 #include <linux/ctype.h>
42 #include <linux/string.h>
43 #include <linux/hdreg.h>
44 #include <linux/proc_fs.h>
45 #include <linux/random.h>
46 #include <linux/module.h>
47 #include <linux/reboot.h>
48 #include <linux/file.h>
49 #include <linux/compat.h>
50 #include <linux/delay.h>
51 #include <linux/raid/md_p.h>
52 #include <linux/raid/md_u.h>
53 #include <linux/slab.h>
56 #include "md-cluster.h"
59 static void autostart_arrays(int part);
62 /* pers_list is a list of registered personalities protected
64 * pers_lock does extra service to protect accesses to
65 * mddev->thread when the mutex cannot be held.
67 static LIST_HEAD(pers_list);
68 static DEFINE_SPINLOCK(pers_lock);
70 struct md_cluster_operations *md_cluster_ops;
71 EXPORT_SYMBOL(md_cluster_ops);
72 struct module *md_cluster_mod;
73 EXPORT_SYMBOL(md_cluster_mod);
75 static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
76 static struct workqueue_struct *md_wq;
77 static struct workqueue_struct *md_misc_wq;
79 static int remove_and_add_spares(struct mddev *mddev,
80 struct md_rdev *this);
81 static void mddev_detach(struct mddev *mddev);
84 * Default number of read corrections we'll attempt on an rdev
85 * before ejecting it from the array. We divide the read error
86 * count by 2 for every hour elapsed between read errors.
88 #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
90 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
91 * is 1000 KB/sec, so the extra system load does not show up that much.
92 * Increase it if you want to have more _guaranteed_ speed. Note that
93 * the RAID driver will use the maximum available bandwidth if the IO
94 * subsystem is idle. There is also an 'absolute maximum' reconstruction
95 * speed limit - in case reconstruction slows down your system despite
98 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
99 * or /sys/block/mdX/md/sync_speed_{min,max}
102 static int sysctl_speed_limit_min = 1000;
103 static int sysctl_speed_limit_max = 200000;
104 static inline int speed_min(struct mddev *mddev)
106 return mddev->sync_speed_min ?
107 mddev->sync_speed_min : sysctl_speed_limit_min;
110 static inline int speed_max(struct mddev *mddev)
112 return mddev->sync_speed_max ?
113 mddev->sync_speed_max : sysctl_speed_limit_max;
116 static struct ctl_table_header *raid_table_header;
118 static struct ctl_table raid_table[] = {
120 .procname = "speed_limit_min",
121 .data = &sysctl_speed_limit_min,
122 .maxlen = sizeof(int),
123 .mode = S_IRUGO|S_IWUSR,
124 .proc_handler = proc_dointvec,
127 .procname = "speed_limit_max",
128 .data = &sysctl_speed_limit_max,
129 .maxlen = sizeof(int),
130 .mode = S_IRUGO|S_IWUSR,
131 .proc_handler = proc_dointvec,
136 static struct ctl_table raid_dir_table[] = {
140 .mode = S_IRUGO|S_IXUGO,
146 static struct ctl_table raid_root_table[] = {
151 .child = raid_dir_table,
156 static const struct block_device_operations md_fops;
158 static int start_readonly;
161 * like bio_clone, but with a local bio set
164 struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs,
169 if (!mddev || !mddev->bio_set)
170 return bio_alloc(gfp_mask, nr_iovecs);
172 b = bio_alloc_bioset(gfp_mask, nr_iovecs, mddev->bio_set);
177 EXPORT_SYMBOL_GPL(bio_alloc_mddev);
179 struct bio *bio_clone_mddev(struct bio *bio, gfp_t gfp_mask,
182 if (!mddev || !mddev->bio_set)
183 return bio_clone(bio, gfp_mask);
185 return bio_clone_bioset(bio, gfp_mask, mddev->bio_set);
187 EXPORT_SYMBOL_GPL(bio_clone_mddev);
190 * We have a system wide 'event count' that is incremented
191 * on any 'interesting' event, and readers of /proc/mdstat
192 * can use 'poll' or 'select' to find out when the event
196 * start array, stop array, error, add device, remove device,
197 * start build, activate spare
199 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
200 static atomic_t md_event_count;
201 void md_new_event(struct mddev *mddev)
203 atomic_inc(&md_event_count);
204 wake_up(&md_event_waiters);
206 EXPORT_SYMBOL_GPL(md_new_event);
208 /* Alternate version that can be called from interrupts
209 * when calling sysfs_notify isn't needed.
211 static void md_new_event_inintr(struct mddev *mddev)
213 atomic_inc(&md_event_count);
214 wake_up(&md_event_waiters);
218 * Enables to iterate over all existing md arrays
219 * all_mddevs_lock protects this list.
221 static LIST_HEAD(all_mddevs);
222 static DEFINE_SPINLOCK(all_mddevs_lock);
225 * iterates through all used mddevs in the system.
226 * We take care to grab the all_mddevs_lock whenever navigating
227 * the list, and to always hold a refcount when unlocked.
228 * Any code which breaks out of this loop while own
229 * a reference to the current mddev and must mddev_put it.
231 #define for_each_mddev(_mddev,_tmp) \
233 for (({ spin_lock(&all_mddevs_lock); \
234 _tmp = all_mddevs.next; \
236 ({ if (_tmp != &all_mddevs) \
237 mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\
238 spin_unlock(&all_mddevs_lock); \
239 if (_mddev) mddev_put(_mddev); \
240 _mddev = list_entry(_tmp, struct mddev, all_mddevs); \
241 _tmp != &all_mddevs;}); \
242 ({ spin_lock(&all_mddevs_lock); \
243 _tmp = _tmp->next;}) \
246 /* Rather than calling directly into the personality make_request function,
247 * IO requests come here first so that we can check if the device is
248 * being suspended pending a reconfiguration.
249 * We hold a refcount over the call to ->make_request. By the time that
250 * call has finished, the bio has been linked into some internal structure
251 * and so is visible to ->quiesce(), so we don't need the refcount any more.
253 static void md_make_request(struct request_queue *q, struct bio *bio)
255 const int rw = bio_data_dir(bio);
256 struct mddev *mddev = q->queuedata;
257 unsigned int sectors;
259 if (mddev == NULL || mddev->pers == NULL
264 if (mddev->ro == 1 && unlikely(rw == WRITE)) {
265 bio_endio(bio, bio_sectors(bio) == 0 ? 0 : -EROFS);
268 smp_rmb(); /* Ensure implications of 'active' are visible */
270 if (mddev->suspended) {
273 prepare_to_wait(&mddev->sb_wait, &__wait,
274 TASK_UNINTERRUPTIBLE);
275 if (!mddev->suspended)
281 finish_wait(&mddev->sb_wait, &__wait);
283 atomic_inc(&mddev->active_io);
287 * save the sectors now since our bio can
288 * go away inside make_request
290 sectors = bio_sectors(bio);
291 mddev->pers->make_request(mddev, bio);
293 generic_start_io_acct(rw, sectors, &mddev->gendisk->part0);
295 if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended)
296 wake_up(&mddev->sb_wait);
299 /* mddev_suspend makes sure no new requests are submitted
300 * to the device, and that any requests that have been submitted
301 * are completely handled.
302 * Once mddev_detach() is called and completes, the module will be
305 void mddev_suspend(struct mddev *mddev)
307 BUG_ON(mddev->suspended);
308 mddev->suspended = 1;
310 wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0);
311 mddev->pers->quiesce(mddev, 1);
313 del_timer_sync(&mddev->safemode_timer);
315 EXPORT_SYMBOL_GPL(mddev_suspend);
317 void mddev_resume(struct mddev *mddev)
319 mddev->suspended = 0;
320 wake_up(&mddev->sb_wait);
321 mddev->pers->quiesce(mddev, 0);
323 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
324 md_wakeup_thread(mddev->thread);
325 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
327 EXPORT_SYMBOL_GPL(mddev_resume);
329 int mddev_congested(struct mddev *mddev, int bits)
331 struct md_personality *pers = mddev->pers;
335 if (mddev->suspended)
337 else if (pers && pers->congested)
338 ret = pers->congested(mddev, bits);
342 EXPORT_SYMBOL_GPL(mddev_congested);
343 static int md_congested(void *data, int bits)
345 struct mddev *mddev = data;
346 return mddev_congested(mddev, bits);
349 static int md_mergeable_bvec(struct request_queue *q,
350 struct bvec_merge_data *bvm,
351 struct bio_vec *biovec)
353 struct mddev *mddev = q->queuedata;
356 if (mddev->suspended) {
357 /* Must always allow one vec */
358 if (bvm->bi_size == 0)
359 ret = biovec->bv_len;
363 struct md_personality *pers = mddev->pers;
364 if (pers && pers->mergeable_bvec)
365 ret = pers->mergeable_bvec(mddev, bvm, biovec);
367 ret = biovec->bv_len;
373 * Generic flush handling for md
376 static void md_end_flush(struct bio *bio, int err)
378 struct md_rdev *rdev = bio->bi_private;
379 struct mddev *mddev = rdev->mddev;
381 rdev_dec_pending(rdev, mddev);
383 if (atomic_dec_and_test(&mddev->flush_pending)) {
384 /* The pre-request flush has finished */
385 queue_work(md_wq, &mddev->flush_work);
390 static void md_submit_flush_data(struct work_struct *ws);
392 static void submit_flushes(struct work_struct *ws)
394 struct mddev *mddev = container_of(ws, struct mddev, flush_work);
395 struct md_rdev *rdev;
397 INIT_WORK(&mddev->flush_work, md_submit_flush_data);
398 atomic_set(&mddev->flush_pending, 1);
400 rdev_for_each_rcu(rdev, mddev)
401 if (rdev->raid_disk >= 0 &&
402 !test_bit(Faulty, &rdev->flags)) {
403 /* Take two references, one is dropped
404 * when request finishes, one after
405 * we reclaim rcu_read_lock
408 atomic_inc(&rdev->nr_pending);
409 atomic_inc(&rdev->nr_pending);
411 bi = bio_alloc_mddev(GFP_NOIO, 0, mddev);
412 bi->bi_end_io = md_end_flush;
413 bi->bi_private = rdev;
414 bi->bi_bdev = rdev->bdev;
415 atomic_inc(&mddev->flush_pending);
416 submit_bio(WRITE_FLUSH, bi);
418 rdev_dec_pending(rdev, mddev);
421 if (atomic_dec_and_test(&mddev->flush_pending))
422 queue_work(md_wq, &mddev->flush_work);
425 static void md_submit_flush_data(struct work_struct *ws)
427 struct mddev *mddev = container_of(ws, struct mddev, flush_work);
428 struct bio *bio = mddev->flush_bio;
430 if (bio->bi_iter.bi_size == 0)
431 /* an empty barrier - all done */
434 bio->bi_rw &= ~REQ_FLUSH;
435 mddev->pers->make_request(mddev, bio);
438 mddev->flush_bio = NULL;
439 wake_up(&mddev->sb_wait);
442 void md_flush_request(struct mddev *mddev, struct bio *bio)
444 spin_lock_irq(&mddev->lock);
445 wait_event_lock_irq(mddev->sb_wait,
448 mddev->flush_bio = bio;
449 spin_unlock_irq(&mddev->lock);
451 INIT_WORK(&mddev->flush_work, submit_flushes);
452 queue_work(md_wq, &mddev->flush_work);
454 EXPORT_SYMBOL(md_flush_request);
456 void md_unplug(struct blk_plug_cb *cb, bool from_schedule)
458 struct mddev *mddev = cb->data;
459 md_wakeup_thread(mddev->thread);
462 EXPORT_SYMBOL(md_unplug);
464 static inline struct mddev *mddev_get(struct mddev *mddev)
466 atomic_inc(&mddev->active);
470 static void mddev_delayed_delete(struct work_struct *ws);
472 static void mddev_put(struct mddev *mddev)
474 struct bio_set *bs = NULL;
476 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
478 if (!mddev->raid_disks && list_empty(&mddev->disks) &&
479 mddev->ctime == 0 && !mddev->hold_active) {
480 /* Array is not configured at all, and not held active,
482 list_del_init(&mddev->all_mddevs);
484 mddev->bio_set = NULL;
485 if (mddev->gendisk) {
486 /* We did a probe so need to clean up. Call
487 * queue_work inside the spinlock so that
488 * flush_workqueue() after mddev_find will
489 * succeed in waiting for the work to be done.
491 INIT_WORK(&mddev->del_work, mddev_delayed_delete);
492 queue_work(md_misc_wq, &mddev->del_work);
496 spin_unlock(&all_mddevs_lock);
501 void mddev_init(struct mddev *mddev)
503 mutex_init(&mddev->open_mutex);
504 mutex_init(&mddev->reconfig_mutex);
505 mutex_init(&mddev->bitmap_info.mutex);
506 INIT_LIST_HEAD(&mddev->disks);
507 INIT_LIST_HEAD(&mddev->all_mddevs);
508 init_timer(&mddev->safemode_timer);
509 atomic_set(&mddev->active, 1);
510 atomic_set(&mddev->openers, 0);
511 atomic_set(&mddev->active_io, 0);
512 spin_lock_init(&mddev->lock);
513 atomic_set(&mddev->flush_pending, 0);
514 init_waitqueue_head(&mddev->sb_wait);
515 init_waitqueue_head(&mddev->recovery_wait);
516 mddev->reshape_position = MaxSector;
517 mddev->reshape_backwards = 0;
518 mddev->last_sync_action = "none";
519 mddev->resync_min = 0;
520 mddev->resync_max = MaxSector;
521 mddev->level = LEVEL_NONE;
523 EXPORT_SYMBOL_GPL(mddev_init);
525 static struct mddev *mddev_find(dev_t unit)
527 struct mddev *mddev, *new = NULL;
529 if (unit && MAJOR(unit) != MD_MAJOR)
530 unit &= ~((1<<MdpMinorShift)-1);
533 spin_lock(&all_mddevs_lock);
536 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
537 if (mddev->unit == unit) {
539 spin_unlock(&all_mddevs_lock);
545 list_add(&new->all_mddevs, &all_mddevs);
546 spin_unlock(&all_mddevs_lock);
547 new->hold_active = UNTIL_IOCTL;
551 /* find an unused unit number */
552 static int next_minor = 512;
553 int start = next_minor;
557 dev = MKDEV(MD_MAJOR, next_minor);
559 if (next_minor > MINORMASK)
561 if (next_minor == start) {
562 /* Oh dear, all in use. */
563 spin_unlock(&all_mddevs_lock);
569 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
570 if (mddev->unit == dev) {
576 new->md_minor = MINOR(dev);
577 new->hold_active = UNTIL_STOP;
578 list_add(&new->all_mddevs, &all_mddevs);
579 spin_unlock(&all_mddevs_lock);
582 spin_unlock(&all_mddevs_lock);
584 new = kzalloc(sizeof(*new), GFP_KERNEL);
589 if (MAJOR(unit) == MD_MAJOR)
590 new->md_minor = MINOR(unit);
592 new->md_minor = MINOR(unit) >> MdpMinorShift;
599 static struct attribute_group md_redundancy_group;
601 void mddev_unlock(struct mddev *mddev)
603 if (mddev->to_remove) {
604 /* These cannot be removed under reconfig_mutex as
605 * an access to the files will try to take reconfig_mutex
606 * while holding the file unremovable, which leads to
608 * So hold set sysfs_active while the remove in happeing,
609 * and anything else which might set ->to_remove or my
610 * otherwise change the sysfs namespace will fail with
611 * -EBUSY if sysfs_active is still set.
612 * We set sysfs_active under reconfig_mutex and elsewhere
613 * test it under the same mutex to ensure its correct value
616 struct attribute_group *to_remove = mddev->to_remove;
617 mddev->to_remove = NULL;
618 mddev->sysfs_active = 1;
619 mutex_unlock(&mddev->reconfig_mutex);
621 if (mddev->kobj.sd) {
622 if (to_remove != &md_redundancy_group)
623 sysfs_remove_group(&mddev->kobj, to_remove);
624 if (mddev->pers == NULL ||
625 mddev->pers->sync_request == NULL) {
626 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
627 if (mddev->sysfs_action)
628 sysfs_put(mddev->sysfs_action);
629 mddev->sysfs_action = NULL;
632 mddev->sysfs_active = 0;
634 mutex_unlock(&mddev->reconfig_mutex);
636 /* As we've dropped the mutex we need a spinlock to
637 * make sure the thread doesn't disappear
639 spin_lock(&pers_lock);
640 md_wakeup_thread(mddev->thread);
641 spin_unlock(&pers_lock);
643 EXPORT_SYMBOL_GPL(mddev_unlock);
645 static struct md_rdev *find_rdev_nr_rcu(struct mddev *mddev, int nr)
647 struct md_rdev *rdev;
649 rdev_for_each_rcu(rdev, mddev)
650 if (rdev->desc_nr == nr)
656 static struct md_rdev *find_rdev(struct mddev *mddev, dev_t dev)
658 struct md_rdev *rdev;
660 rdev_for_each(rdev, mddev)
661 if (rdev->bdev->bd_dev == dev)
667 static struct md_rdev *find_rdev_rcu(struct mddev *mddev, dev_t dev)
669 struct md_rdev *rdev;
671 rdev_for_each_rcu(rdev, mddev)
672 if (rdev->bdev->bd_dev == dev)
678 static struct md_personality *find_pers(int level, char *clevel)
680 struct md_personality *pers;
681 list_for_each_entry(pers, &pers_list, list) {
682 if (level != LEVEL_NONE && pers->level == level)
684 if (strcmp(pers->name, clevel)==0)
690 /* return the offset of the super block in 512byte sectors */
691 static inline sector_t calc_dev_sboffset(struct md_rdev *rdev)
693 sector_t num_sectors = i_size_read(rdev->bdev->bd_inode) / 512;
694 return MD_NEW_SIZE_SECTORS(num_sectors);
697 static int alloc_disk_sb(struct md_rdev *rdev)
699 rdev->sb_page = alloc_page(GFP_KERNEL);
700 if (!rdev->sb_page) {
701 printk(KERN_ALERT "md: out of memory.\n");
708 void md_rdev_clear(struct md_rdev *rdev)
711 put_page(rdev->sb_page);
713 rdev->sb_page = NULL;
718 put_page(rdev->bb_page);
719 rdev->bb_page = NULL;
721 kfree(rdev->badblocks.page);
722 rdev->badblocks.page = NULL;
724 EXPORT_SYMBOL_GPL(md_rdev_clear);
726 static void super_written(struct bio *bio, int error)
728 struct md_rdev *rdev = bio->bi_private;
729 struct mddev *mddev = rdev->mddev;
731 if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) {
732 printk("md: super_written gets error=%d, uptodate=%d\n",
733 error, test_bit(BIO_UPTODATE, &bio->bi_flags));
734 WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags));
735 md_error(mddev, rdev);
738 if (atomic_dec_and_test(&mddev->pending_writes))
739 wake_up(&mddev->sb_wait);
743 void md_super_write(struct mddev *mddev, struct md_rdev *rdev,
744 sector_t sector, int size, struct page *page)
746 /* write first size bytes of page to sector of rdev
747 * Increment mddev->pending_writes before returning
748 * and decrement it on completion, waking up sb_wait
749 * if zero is reached.
750 * If an error occurred, call md_error
752 struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, mddev);
754 bio->bi_bdev = rdev->meta_bdev ? rdev->meta_bdev : rdev->bdev;
755 bio->bi_iter.bi_sector = sector;
756 bio_add_page(bio, page, size, 0);
757 bio->bi_private = rdev;
758 bio->bi_end_io = super_written;
760 atomic_inc(&mddev->pending_writes);
761 submit_bio(WRITE_FLUSH_FUA, bio);
764 void md_super_wait(struct mddev *mddev)
766 /* wait for all superblock writes that were scheduled to complete */
767 wait_event(mddev->sb_wait, atomic_read(&mddev->pending_writes)==0);
770 int sync_page_io(struct md_rdev *rdev, sector_t sector, int size,
771 struct page *page, int rw, bool metadata_op)
773 struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, rdev->mddev);
776 bio->bi_bdev = (metadata_op && rdev->meta_bdev) ?
777 rdev->meta_bdev : rdev->bdev;
779 bio->bi_iter.bi_sector = sector + rdev->sb_start;
780 else if (rdev->mddev->reshape_position != MaxSector &&
781 (rdev->mddev->reshape_backwards ==
782 (sector >= rdev->mddev->reshape_position)))
783 bio->bi_iter.bi_sector = sector + rdev->new_data_offset;
785 bio->bi_iter.bi_sector = sector + rdev->data_offset;
786 bio_add_page(bio, page, size, 0);
787 submit_bio_wait(rw, bio);
789 ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
793 EXPORT_SYMBOL_GPL(sync_page_io);
795 static int read_disk_sb(struct md_rdev *rdev, int size)
797 char b[BDEVNAME_SIZE];
802 if (!sync_page_io(rdev, 0, size, rdev->sb_page, READ, true))
808 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
809 bdevname(rdev->bdev,b));
813 static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
815 return sb1->set_uuid0 == sb2->set_uuid0 &&
816 sb1->set_uuid1 == sb2->set_uuid1 &&
817 sb1->set_uuid2 == sb2->set_uuid2 &&
818 sb1->set_uuid3 == sb2->set_uuid3;
821 static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
824 mdp_super_t *tmp1, *tmp2;
826 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
827 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
829 if (!tmp1 || !tmp2) {
831 printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n");
839 * nr_disks is not constant
844 ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0);
851 static u32 md_csum_fold(u32 csum)
853 csum = (csum & 0xffff) + (csum >> 16);
854 return (csum & 0xffff) + (csum >> 16);
857 static unsigned int calc_sb_csum(mdp_super_t *sb)
860 u32 *sb32 = (u32*)sb;
862 unsigned int disk_csum, csum;
864 disk_csum = sb->sb_csum;
867 for (i = 0; i < MD_SB_BYTES/4 ; i++)
869 csum = (newcsum & 0xffffffff) + (newcsum>>32);
872 /* This used to use csum_partial, which was wrong for several
873 * reasons including that different results are returned on
874 * different architectures. It isn't critical that we get exactly
875 * the same return value as before (we always csum_fold before
876 * testing, and that removes any differences). However as we
877 * know that csum_partial always returned a 16bit value on
878 * alphas, do a fold to maximise conformity to previous behaviour.
880 sb->sb_csum = md_csum_fold(disk_csum);
882 sb->sb_csum = disk_csum;
888 * Handle superblock details.
889 * We want to be able to handle multiple superblock formats
890 * so we have a common interface to them all, and an array of
891 * different handlers.
892 * We rely on user-space to write the initial superblock, and support
893 * reading and updating of superblocks.
894 * Interface methods are:
895 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version)
896 * loads and validates a superblock on dev.
897 * if refdev != NULL, compare superblocks on both devices
899 * 0 - dev has a superblock that is compatible with refdev
900 * 1 - dev has a superblock that is compatible and newer than refdev
901 * so dev should be used as the refdev in future
902 * -EINVAL superblock incompatible or invalid
903 * -othererror e.g. -EIO
905 * int validate_super(struct mddev *mddev, struct md_rdev *dev)
906 * Verify that dev is acceptable into mddev.
907 * The first time, mddev->raid_disks will be 0, and data from
908 * dev should be merged in. Subsequent calls check that dev
909 * is new enough. Return 0 or -EINVAL
911 * void sync_super(struct mddev *mddev, struct md_rdev *dev)
912 * Update the superblock for rdev with data in mddev
913 * This does not write to disc.
919 struct module *owner;
920 int (*load_super)(struct md_rdev *rdev,
921 struct md_rdev *refdev,
923 int (*validate_super)(struct mddev *mddev,
924 struct md_rdev *rdev);
925 void (*sync_super)(struct mddev *mddev,
926 struct md_rdev *rdev);
927 unsigned long long (*rdev_size_change)(struct md_rdev *rdev,
928 sector_t num_sectors);
929 int (*allow_new_offset)(struct md_rdev *rdev,
930 unsigned long long new_offset);
934 * Check that the given mddev has no bitmap.
936 * This function is called from the run method of all personalities that do not
937 * support bitmaps. It prints an error message and returns non-zero if mddev
938 * has a bitmap. Otherwise, it returns 0.
941 int md_check_no_bitmap(struct mddev *mddev)
943 if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset)
945 printk(KERN_ERR "%s: bitmaps are not supported for %s\n",
946 mdname(mddev), mddev->pers->name);
949 EXPORT_SYMBOL(md_check_no_bitmap);
952 * load_super for 0.90.0
954 static int super_90_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
956 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
961 * Calculate the position of the superblock (512byte sectors),
962 * it's at the end of the disk.
964 * It also happens to be a multiple of 4Kb.
966 rdev->sb_start = calc_dev_sboffset(rdev);
968 ret = read_disk_sb(rdev, MD_SB_BYTES);
973 bdevname(rdev->bdev, b);
974 sb = page_address(rdev->sb_page);
976 if (sb->md_magic != MD_SB_MAGIC) {
977 printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
982 if (sb->major_version != 0 ||
983 sb->minor_version < 90 ||
984 sb->minor_version > 91) {
985 printk(KERN_WARNING "Bad version number %d.%d on %s\n",
986 sb->major_version, sb->minor_version,
991 if (sb->raid_disks <= 0)
994 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
995 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
1000 rdev->preferred_minor = sb->md_minor;
1001 rdev->data_offset = 0;
1002 rdev->new_data_offset = 0;
1003 rdev->sb_size = MD_SB_BYTES;
1004 rdev->badblocks.shift = -1;
1006 if (sb->level == LEVEL_MULTIPATH)
1009 rdev->desc_nr = sb->this_disk.number;
1015 mdp_super_t *refsb = page_address(refdev->sb_page);
1016 if (!uuid_equal(refsb, sb)) {
1017 printk(KERN_WARNING "md: %s has different UUID to %s\n",
1018 b, bdevname(refdev->bdev,b2));
1021 if (!sb_equal(refsb, sb)) {
1022 printk(KERN_WARNING "md: %s has same UUID"
1023 " but different superblock to %s\n",
1024 b, bdevname(refdev->bdev, b2));
1028 ev2 = md_event(refsb);
1034 rdev->sectors = rdev->sb_start;
1035 /* Limit to 4TB as metadata cannot record more than that.
1036 * (not needed for Linear and RAID0 as metadata doesn't
1039 if (rdev->sectors >= (2ULL << 32) && sb->level >= 1)
1040 rdev->sectors = (2ULL << 32) - 2;
1042 if (rdev->sectors < ((sector_t)sb->size) * 2 && sb->level >= 1)
1043 /* "this cannot possibly happen" ... */
1051 * validate_super for 0.90.0
1053 static int super_90_validate(struct mddev *mddev, struct md_rdev *rdev)
1056 mdp_super_t *sb = page_address(rdev->sb_page);
1057 __u64 ev1 = md_event(sb);
1059 rdev->raid_disk = -1;
1060 clear_bit(Faulty, &rdev->flags);
1061 clear_bit(In_sync, &rdev->flags);
1062 clear_bit(Bitmap_sync, &rdev->flags);
1063 clear_bit(WriteMostly, &rdev->flags);
1065 if (mddev->raid_disks == 0) {
1066 mddev->major_version = 0;
1067 mddev->minor_version = sb->minor_version;
1068 mddev->patch_version = sb->patch_version;
1069 mddev->external = 0;
1070 mddev->chunk_sectors = sb->chunk_size >> 9;
1071 mddev->ctime = sb->ctime;
1072 mddev->utime = sb->utime;
1073 mddev->level = sb->level;
1074 mddev->clevel[0] = 0;
1075 mddev->layout = sb->layout;
1076 mddev->raid_disks = sb->raid_disks;
1077 mddev->dev_sectors = ((sector_t)sb->size) * 2;
1078 mddev->events = ev1;
1079 mddev->bitmap_info.offset = 0;
1080 mddev->bitmap_info.space = 0;
1081 /* bitmap can use 60 K after the 4K superblocks */
1082 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
1083 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
1084 mddev->reshape_backwards = 0;
1086 if (mddev->minor_version >= 91) {
1087 mddev->reshape_position = sb->reshape_position;
1088 mddev->delta_disks = sb->delta_disks;
1089 mddev->new_level = sb->new_level;
1090 mddev->new_layout = sb->new_layout;
1091 mddev->new_chunk_sectors = sb->new_chunk >> 9;
1092 if (mddev->delta_disks < 0)
1093 mddev->reshape_backwards = 1;
1095 mddev->reshape_position = MaxSector;
1096 mddev->delta_disks = 0;
1097 mddev->new_level = mddev->level;
1098 mddev->new_layout = mddev->layout;
1099 mddev->new_chunk_sectors = mddev->chunk_sectors;
1102 if (sb->state & (1<<MD_SB_CLEAN))
1103 mddev->recovery_cp = MaxSector;
1105 if (sb->events_hi == sb->cp_events_hi &&
1106 sb->events_lo == sb->cp_events_lo) {
1107 mddev->recovery_cp = sb->recovery_cp;
1109 mddev->recovery_cp = 0;
1112 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
1113 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
1114 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
1115 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
1117 mddev->max_disks = MD_SB_DISKS;
1119 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
1120 mddev->bitmap_info.file == NULL) {
1121 mddev->bitmap_info.offset =
1122 mddev->bitmap_info.default_offset;
1123 mddev->bitmap_info.space =
1124 mddev->bitmap_info.default_space;
1127 } else if (mddev->pers == NULL) {
1128 /* Insist on good event counter while assembling, except
1129 * for spares (which don't need an event count) */
1131 if (sb->disks[rdev->desc_nr].state & (
1132 (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE)))
1133 if (ev1 < mddev->events)
1135 } else if (mddev->bitmap) {
1136 /* if adding to array with a bitmap, then we can accept an
1137 * older device ... but not too old.
1139 if (ev1 < mddev->bitmap->events_cleared)
1141 if (ev1 < mddev->events)
1142 set_bit(Bitmap_sync, &rdev->flags);
1144 if (ev1 < mddev->events)
1145 /* just a hot-add of a new device, leave raid_disk at -1 */
1149 if (mddev->level != LEVEL_MULTIPATH) {
1150 desc = sb->disks + rdev->desc_nr;
1152 if (desc->state & (1<<MD_DISK_FAULTY))
1153 set_bit(Faulty, &rdev->flags);
1154 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
1155 desc->raid_disk < mddev->raid_disks */) {
1156 set_bit(In_sync, &rdev->flags);
1157 rdev->raid_disk = desc->raid_disk;
1158 rdev->saved_raid_disk = desc->raid_disk;
1159 } else if (desc->state & (1<<MD_DISK_ACTIVE)) {
1160 /* active but not in sync implies recovery up to
1161 * reshape position. We don't know exactly where
1162 * that is, so set to zero for now */
1163 if (mddev->minor_version >= 91) {
1164 rdev->recovery_offset = 0;
1165 rdev->raid_disk = desc->raid_disk;
1168 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
1169 set_bit(WriteMostly, &rdev->flags);
1170 } else /* MULTIPATH are always insync */
1171 set_bit(In_sync, &rdev->flags);
1176 * sync_super for 0.90.0
1178 static void super_90_sync(struct mddev *mddev, struct md_rdev *rdev)
1181 struct md_rdev *rdev2;
1182 int next_spare = mddev->raid_disks;
1184 /* make rdev->sb match mddev data..
1187 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1188 * 3/ any empty disks < next_spare become removed
1190 * disks[0] gets initialised to REMOVED because
1191 * we cannot be sure from other fields if it has
1192 * been initialised or not.
1195 int active=0, working=0,failed=0,spare=0,nr_disks=0;
1197 rdev->sb_size = MD_SB_BYTES;
1199 sb = page_address(rdev->sb_page);
1201 memset(sb, 0, sizeof(*sb));
1203 sb->md_magic = MD_SB_MAGIC;
1204 sb->major_version = mddev->major_version;
1205 sb->patch_version = mddev->patch_version;
1206 sb->gvalid_words = 0; /* ignored */
1207 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
1208 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
1209 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
1210 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
1212 sb->ctime = mddev->ctime;
1213 sb->level = mddev->level;
1214 sb->size = mddev->dev_sectors / 2;
1215 sb->raid_disks = mddev->raid_disks;
1216 sb->md_minor = mddev->md_minor;
1217 sb->not_persistent = 0;
1218 sb->utime = mddev->utime;
1220 sb->events_hi = (mddev->events>>32);
1221 sb->events_lo = (u32)mddev->events;
1223 if (mddev->reshape_position == MaxSector)
1224 sb->minor_version = 90;
1226 sb->minor_version = 91;
1227 sb->reshape_position = mddev->reshape_position;
1228 sb->new_level = mddev->new_level;
1229 sb->delta_disks = mddev->delta_disks;
1230 sb->new_layout = mddev->new_layout;
1231 sb->new_chunk = mddev->new_chunk_sectors << 9;
1233 mddev->minor_version = sb->minor_version;
1236 sb->recovery_cp = mddev->recovery_cp;
1237 sb->cp_events_hi = (mddev->events>>32);
1238 sb->cp_events_lo = (u32)mddev->events;
1239 if (mddev->recovery_cp == MaxSector)
1240 sb->state = (1<< MD_SB_CLEAN);
1242 sb->recovery_cp = 0;
1244 sb->layout = mddev->layout;
1245 sb->chunk_size = mddev->chunk_sectors << 9;
1247 if (mddev->bitmap && mddev->bitmap_info.file == NULL)
1248 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
1250 sb->disks[0].state = (1<<MD_DISK_REMOVED);
1251 rdev_for_each(rdev2, mddev) {
1254 int is_active = test_bit(In_sync, &rdev2->flags);
1256 if (rdev2->raid_disk >= 0 &&
1257 sb->minor_version >= 91)
1258 /* we have nowhere to store the recovery_offset,
1259 * but if it is not below the reshape_position,
1260 * we can piggy-back on that.
1263 if (rdev2->raid_disk < 0 ||
1264 test_bit(Faulty, &rdev2->flags))
1267 desc_nr = rdev2->raid_disk;
1269 desc_nr = next_spare++;
1270 rdev2->desc_nr = desc_nr;
1271 d = &sb->disks[rdev2->desc_nr];
1273 d->number = rdev2->desc_nr;
1274 d->major = MAJOR(rdev2->bdev->bd_dev);
1275 d->minor = MINOR(rdev2->bdev->bd_dev);
1277 d->raid_disk = rdev2->raid_disk;
1279 d->raid_disk = rdev2->desc_nr; /* compatibility */
1280 if (test_bit(Faulty, &rdev2->flags))
1281 d->state = (1<<MD_DISK_FAULTY);
1282 else if (is_active) {
1283 d->state = (1<<MD_DISK_ACTIVE);
1284 if (test_bit(In_sync, &rdev2->flags))
1285 d->state |= (1<<MD_DISK_SYNC);
1293 if (test_bit(WriteMostly, &rdev2->flags))
1294 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1296 /* now set the "removed" and "faulty" bits on any missing devices */
1297 for (i=0 ; i < mddev->raid_disks ; i++) {
1298 mdp_disk_t *d = &sb->disks[i];
1299 if (d->state == 0 && d->number == 0) {
1302 d->state = (1<<MD_DISK_REMOVED);
1303 d->state |= (1<<MD_DISK_FAULTY);
1307 sb->nr_disks = nr_disks;
1308 sb->active_disks = active;
1309 sb->working_disks = working;
1310 sb->failed_disks = failed;
1311 sb->spare_disks = spare;
1313 sb->this_disk = sb->disks[rdev->desc_nr];
1314 sb->sb_csum = calc_sb_csum(sb);
1318 * rdev_size_change for 0.90.0
1320 static unsigned long long
1321 super_90_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
1323 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1324 return 0; /* component must fit device */
1325 if (rdev->mddev->bitmap_info.offset)
1326 return 0; /* can't move bitmap */
1327 rdev->sb_start = calc_dev_sboffset(rdev);
1328 if (!num_sectors || num_sectors > rdev->sb_start)
1329 num_sectors = rdev->sb_start;
1330 /* Limit to 4TB as metadata cannot record more than that.
1331 * 4TB == 2^32 KB, or 2*2^32 sectors.
1333 if (num_sectors >= (2ULL << 32) && rdev->mddev->level >= 1)
1334 num_sectors = (2ULL << 32) - 2;
1335 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1337 md_super_wait(rdev->mddev);
1342 super_90_allow_new_offset(struct md_rdev *rdev, unsigned long long new_offset)
1344 /* non-zero offset changes not possible with v0.90 */
1345 return new_offset == 0;
1349 * version 1 superblock
1352 static __le32 calc_sb_1_csum(struct mdp_superblock_1 *sb)
1356 unsigned long long newcsum;
1357 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1358 __le32 *isuper = (__le32*)sb;
1360 disk_csum = sb->sb_csum;
1363 for (; size >= 4; size -= 4)
1364 newcsum += le32_to_cpu(*isuper++);
1367 newcsum += le16_to_cpu(*(__le16*) isuper);
1369 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1370 sb->sb_csum = disk_csum;
1371 return cpu_to_le32(csum);
1374 static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors,
1376 static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
1378 struct mdp_superblock_1 *sb;
1382 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1386 * Calculate the position of the superblock in 512byte sectors.
1387 * It is always aligned to a 4K boundary and
1388 * depeding on minor_version, it can be:
1389 * 0: At least 8K, but less than 12K, from end of device
1390 * 1: At start of device
1391 * 2: 4K from start of device.
1393 switch(minor_version) {
1395 sb_start = i_size_read(rdev->bdev->bd_inode) >> 9;
1397 sb_start &= ~(sector_t)(4*2-1);
1408 rdev->sb_start = sb_start;
1410 /* superblock is rarely larger than 1K, but it can be larger,
1411 * and it is safe to read 4k, so we do that
1413 ret = read_disk_sb(rdev, 4096);
1414 if (ret) return ret;
1416 sb = page_address(rdev->sb_page);
1418 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1419 sb->major_version != cpu_to_le32(1) ||
1420 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1421 le64_to_cpu(sb->super_offset) != rdev->sb_start ||
1422 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1425 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1426 printk("md: invalid superblock checksum on %s\n",
1427 bdevname(rdev->bdev,b));
1430 if (le64_to_cpu(sb->data_size) < 10) {
1431 printk("md: data_size too small on %s\n",
1432 bdevname(rdev->bdev,b));
1437 memcmp(sb->pad3, sb->pad3+1, sizeof(sb->pad3) - sizeof(sb->pad3[1])))
1438 /* Some padding is non-zero, might be a new feature */
1441 rdev->preferred_minor = 0xffff;
1442 rdev->data_offset = le64_to_cpu(sb->data_offset);
1443 rdev->new_data_offset = rdev->data_offset;
1444 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE) &&
1445 (le32_to_cpu(sb->feature_map) & MD_FEATURE_NEW_OFFSET))
1446 rdev->new_data_offset += (s32)le32_to_cpu(sb->new_offset);
1447 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1449 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1450 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1451 if (rdev->sb_size & bmask)
1452 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1455 && rdev->data_offset < sb_start + (rdev->sb_size/512))
1458 && rdev->new_data_offset < sb_start + (rdev->sb_size/512))
1461 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1464 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1466 if (!rdev->bb_page) {
1467 rdev->bb_page = alloc_page(GFP_KERNEL);
1471 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BAD_BLOCKS) &&
1472 rdev->badblocks.count == 0) {
1473 /* need to load the bad block list.
1474 * Currently we limit it to one page.
1480 int sectors = le16_to_cpu(sb->bblog_size);
1481 if (sectors > (PAGE_SIZE / 512))
1483 offset = le32_to_cpu(sb->bblog_offset);
1486 bb_sector = (long long)offset;
1487 if (!sync_page_io(rdev, bb_sector, sectors << 9,
1488 rdev->bb_page, READ, true))
1490 bbp = (u64 *)page_address(rdev->bb_page);
1491 rdev->badblocks.shift = sb->bblog_shift;
1492 for (i = 0 ; i < (sectors << (9-3)) ; i++, bbp++) {
1493 u64 bb = le64_to_cpu(*bbp);
1494 int count = bb & (0x3ff);
1495 u64 sector = bb >> 10;
1496 sector <<= sb->bblog_shift;
1497 count <<= sb->bblog_shift;
1500 if (md_set_badblocks(&rdev->badblocks,
1501 sector, count, 1) == 0)
1504 } else if (sb->bblog_offset != 0)
1505 rdev->badblocks.shift = 0;
1511 struct mdp_superblock_1 *refsb = page_address(refdev->sb_page);
1513 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1514 sb->level != refsb->level ||
1515 sb->layout != refsb->layout ||
1516 sb->chunksize != refsb->chunksize) {
1517 printk(KERN_WARNING "md: %s has strangely different"
1518 " superblock to %s\n",
1519 bdevname(rdev->bdev,b),
1520 bdevname(refdev->bdev,b2));
1523 ev1 = le64_to_cpu(sb->events);
1524 ev2 = le64_to_cpu(refsb->events);
1531 if (minor_version) {
1532 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9);
1533 sectors -= rdev->data_offset;
1535 sectors = rdev->sb_start;
1536 if (sectors < le64_to_cpu(sb->data_size))
1538 rdev->sectors = le64_to_cpu(sb->data_size);
1542 static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev)
1544 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
1545 __u64 ev1 = le64_to_cpu(sb->events);
1547 rdev->raid_disk = -1;
1548 clear_bit(Faulty, &rdev->flags);
1549 clear_bit(In_sync, &rdev->flags);
1550 clear_bit(Bitmap_sync, &rdev->flags);
1551 clear_bit(WriteMostly, &rdev->flags);
1553 if (mddev->raid_disks == 0) {
1554 mddev->major_version = 1;
1555 mddev->patch_version = 0;
1556 mddev->external = 0;
1557 mddev->chunk_sectors = le32_to_cpu(sb->chunksize);
1558 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1559 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1560 mddev->level = le32_to_cpu(sb->level);
1561 mddev->clevel[0] = 0;
1562 mddev->layout = le32_to_cpu(sb->layout);
1563 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1564 mddev->dev_sectors = le64_to_cpu(sb->size);
1565 mddev->events = ev1;
1566 mddev->bitmap_info.offset = 0;
1567 mddev->bitmap_info.space = 0;
1568 /* Default location for bitmap is 1K after superblock
1569 * using 3K - total of 4K
1571 mddev->bitmap_info.default_offset = 1024 >> 9;
1572 mddev->bitmap_info.default_space = (4096-1024) >> 9;
1573 mddev->reshape_backwards = 0;
1575 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1576 memcpy(mddev->uuid, sb->set_uuid, 16);
1578 mddev->max_disks = (4096-256)/2;
1580 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1581 mddev->bitmap_info.file == NULL) {
1582 mddev->bitmap_info.offset =
1583 (__s32)le32_to_cpu(sb->bitmap_offset);
1584 /* Metadata doesn't record how much space is available.
1585 * For 1.0, we assume we can use up to the superblock
1586 * if before, else to 4K beyond superblock.
1587 * For others, assume no change is possible.
1589 if (mddev->minor_version > 0)
1590 mddev->bitmap_info.space = 0;
1591 else if (mddev->bitmap_info.offset > 0)
1592 mddev->bitmap_info.space =
1593 8 - mddev->bitmap_info.offset;
1595 mddev->bitmap_info.space =
1596 -mddev->bitmap_info.offset;
1599 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1600 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1601 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1602 mddev->new_level = le32_to_cpu(sb->new_level);
1603 mddev->new_layout = le32_to_cpu(sb->new_layout);
1604 mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk);
1605 if (mddev->delta_disks < 0 ||
1606 (mddev->delta_disks == 0 &&
1607 (le32_to_cpu(sb->feature_map)
1608 & MD_FEATURE_RESHAPE_BACKWARDS)))
1609 mddev->reshape_backwards = 1;
1611 mddev->reshape_position = MaxSector;
1612 mddev->delta_disks = 0;
1613 mddev->new_level = mddev->level;
1614 mddev->new_layout = mddev->layout;
1615 mddev->new_chunk_sectors = mddev->chunk_sectors;
1618 } else if (mddev->pers == NULL) {
1619 /* Insist of good event counter while assembling, except for
1620 * spares (which don't need an event count) */
1622 if (rdev->desc_nr >= 0 &&
1623 rdev->desc_nr < le32_to_cpu(sb->max_dev) &&
1624 le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < 0xfffe)
1625 if (ev1 < mddev->events)
1627 } else if (mddev->bitmap) {
1628 /* If adding to array with a bitmap, then we can accept an
1629 * older device, but not too old.
1631 if (ev1 < mddev->bitmap->events_cleared)
1633 if (ev1 < mddev->events)
1634 set_bit(Bitmap_sync, &rdev->flags);
1636 if (ev1 < mddev->events)
1637 /* just a hot-add of a new device, leave raid_disk at -1 */
1640 if (mddev->level != LEVEL_MULTIPATH) {
1642 if (rdev->desc_nr < 0 ||
1643 rdev->desc_nr >= le32_to_cpu(sb->max_dev)) {
1647 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1649 case 0xffff: /* spare */
1651 case 0xfffe: /* faulty */
1652 set_bit(Faulty, &rdev->flags);
1655 rdev->saved_raid_disk = role;
1656 if ((le32_to_cpu(sb->feature_map) &
1657 MD_FEATURE_RECOVERY_OFFSET)) {
1658 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1659 if (!(le32_to_cpu(sb->feature_map) &
1660 MD_FEATURE_RECOVERY_BITMAP))
1661 rdev->saved_raid_disk = -1;
1663 set_bit(In_sync, &rdev->flags);
1664 rdev->raid_disk = role;
1667 if (sb->devflags & WriteMostly1)
1668 set_bit(WriteMostly, &rdev->flags);
1669 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_REPLACEMENT)
1670 set_bit(Replacement, &rdev->flags);
1671 } else /* MULTIPATH are always insync */
1672 set_bit(In_sync, &rdev->flags);
1677 static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev)
1679 struct mdp_superblock_1 *sb;
1680 struct md_rdev *rdev2;
1682 /* make rdev->sb match mddev and rdev data. */
1684 sb = page_address(rdev->sb_page);
1686 sb->feature_map = 0;
1688 sb->recovery_offset = cpu_to_le64(0);
1689 memset(sb->pad3, 0, sizeof(sb->pad3));
1691 sb->utime = cpu_to_le64((__u64)mddev->utime);
1692 sb->events = cpu_to_le64(mddev->events);
1694 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1696 sb->resync_offset = cpu_to_le64(0);
1698 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
1700 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
1701 sb->size = cpu_to_le64(mddev->dev_sectors);
1702 sb->chunksize = cpu_to_le32(mddev->chunk_sectors);
1703 sb->level = cpu_to_le32(mddev->level);
1704 sb->layout = cpu_to_le32(mddev->layout);
1706 if (test_bit(WriteMostly, &rdev->flags))
1707 sb->devflags |= WriteMostly1;
1709 sb->devflags &= ~WriteMostly1;
1710 sb->data_offset = cpu_to_le64(rdev->data_offset);
1711 sb->data_size = cpu_to_le64(rdev->sectors);
1713 if (mddev->bitmap && mddev->bitmap_info.file == NULL) {
1714 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset);
1715 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
1718 if (rdev->raid_disk >= 0 &&
1719 !test_bit(In_sync, &rdev->flags)) {
1721 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1722 sb->recovery_offset =
1723 cpu_to_le64(rdev->recovery_offset);
1724 if (rdev->saved_raid_disk >= 0 && mddev->bitmap)
1726 cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP);
1728 if (test_bit(Replacement, &rdev->flags))
1730 cpu_to_le32(MD_FEATURE_REPLACEMENT);
1732 if (mddev->reshape_position != MaxSector) {
1733 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1734 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1735 sb->new_layout = cpu_to_le32(mddev->new_layout);
1736 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1737 sb->new_level = cpu_to_le32(mddev->new_level);
1738 sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors);
1739 if (mddev->delta_disks == 0 &&
1740 mddev->reshape_backwards)
1742 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS);
1743 if (rdev->new_data_offset != rdev->data_offset) {
1745 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET);
1746 sb->new_offset = cpu_to_le32((__u32)(rdev->new_data_offset
1747 - rdev->data_offset));
1751 if (rdev->badblocks.count == 0)
1752 /* Nothing to do for bad blocks*/ ;
1753 else if (sb->bblog_offset == 0)
1754 /* Cannot record bad blocks on this device */
1755 md_error(mddev, rdev);
1757 struct badblocks *bb = &rdev->badblocks;
1758 u64 *bbp = (u64 *)page_address(rdev->bb_page);
1760 sb->feature_map |= cpu_to_le32(MD_FEATURE_BAD_BLOCKS);
1765 seq = read_seqbegin(&bb->lock);
1767 memset(bbp, 0xff, PAGE_SIZE);
1769 for (i = 0 ; i < bb->count ; i++) {
1770 u64 internal_bb = p[i];
1771 u64 store_bb = ((BB_OFFSET(internal_bb) << 10)
1772 | BB_LEN(internal_bb));
1773 bbp[i] = cpu_to_le64(store_bb);
1776 if (read_seqretry(&bb->lock, seq))
1779 bb->sector = (rdev->sb_start +
1780 (int)le32_to_cpu(sb->bblog_offset));
1781 bb->size = le16_to_cpu(sb->bblog_size);
1786 rdev_for_each(rdev2, mddev)
1787 if (rdev2->desc_nr+1 > max_dev)
1788 max_dev = rdev2->desc_nr+1;
1790 if (max_dev > le32_to_cpu(sb->max_dev)) {
1792 sb->max_dev = cpu_to_le32(max_dev);
1793 rdev->sb_size = max_dev * 2 + 256;
1794 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1795 if (rdev->sb_size & bmask)
1796 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1798 max_dev = le32_to_cpu(sb->max_dev);
1800 for (i=0; i<max_dev;i++)
1801 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1803 rdev_for_each(rdev2, mddev) {
1805 if (test_bit(Faulty, &rdev2->flags))
1806 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1807 else if (test_bit(In_sync, &rdev2->flags))
1808 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1809 else if (rdev2->raid_disk >= 0)
1810 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1812 sb->dev_roles[i] = cpu_to_le16(0xffff);
1815 sb->sb_csum = calc_sb_1_csum(sb);
1818 static unsigned long long
1819 super_1_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
1821 struct mdp_superblock_1 *sb;
1822 sector_t max_sectors;
1823 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1824 return 0; /* component must fit device */
1825 if (rdev->data_offset != rdev->new_data_offset)
1826 return 0; /* too confusing */
1827 if (rdev->sb_start < rdev->data_offset) {
1828 /* minor versions 1 and 2; superblock before data */
1829 max_sectors = i_size_read(rdev->bdev->bd_inode) >> 9;
1830 max_sectors -= rdev->data_offset;
1831 if (!num_sectors || num_sectors > max_sectors)
1832 num_sectors = max_sectors;
1833 } else if (rdev->mddev->bitmap_info.offset) {
1834 /* minor version 0 with bitmap we can't move */
1837 /* minor version 0; superblock after data */
1839 sb_start = (i_size_read(rdev->bdev->bd_inode) >> 9) - 8*2;
1840 sb_start &= ~(sector_t)(4*2 - 1);
1841 max_sectors = rdev->sectors + sb_start - rdev->sb_start;
1842 if (!num_sectors || num_sectors > max_sectors)
1843 num_sectors = max_sectors;
1844 rdev->sb_start = sb_start;
1846 sb = page_address(rdev->sb_page);
1847 sb->data_size = cpu_to_le64(num_sectors);
1848 sb->super_offset = rdev->sb_start;
1849 sb->sb_csum = calc_sb_1_csum(sb);
1850 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1852 md_super_wait(rdev->mddev);
1858 super_1_allow_new_offset(struct md_rdev *rdev,
1859 unsigned long long new_offset)
1861 /* All necessary checks on new >= old have been done */
1862 struct bitmap *bitmap;
1863 if (new_offset >= rdev->data_offset)
1866 /* with 1.0 metadata, there is no metadata to tread on
1867 * so we can always move back */
1868 if (rdev->mddev->minor_version == 0)
1871 /* otherwise we must be sure not to step on
1872 * any metadata, so stay:
1873 * 36K beyond start of superblock
1874 * beyond end of badblocks
1875 * beyond write-intent bitmap
1877 if (rdev->sb_start + (32+4)*2 > new_offset)
1879 bitmap = rdev->mddev->bitmap;
1880 if (bitmap && !rdev->mddev->bitmap_info.file &&
1881 rdev->sb_start + rdev->mddev->bitmap_info.offset +
1882 bitmap->storage.file_pages * (PAGE_SIZE>>9) > new_offset)
1884 if (rdev->badblocks.sector + rdev->badblocks.size > new_offset)
1890 static struct super_type super_types[] = {
1893 .owner = THIS_MODULE,
1894 .load_super = super_90_load,
1895 .validate_super = super_90_validate,
1896 .sync_super = super_90_sync,
1897 .rdev_size_change = super_90_rdev_size_change,
1898 .allow_new_offset = super_90_allow_new_offset,
1902 .owner = THIS_MODULE,
1903 .load_super = super_1_load,
1904 .validate_super = super_1_validate,
1905 .sync_super = super_1_sync,
1906 .rdev_size_change = super_1_rdev_size_change,
1907 .allow_new_offset = super_1_allow_new_offset,
1911 static void sync_super(struct mddev *mddev, struct md_rdev *rdev)
1913 if (mddev->sync_super) {
1914 mddev->sync_super(mddev, rdev);
1918 BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types));
1920 super_types[mddev->major_version].sync_super(mddev, rdev);
1923 static int match_mddev_units(struct mddev *mddev1, struct mddev *mddev2)
1925 struct md_rdev *rdev, *rdev2;
1928 rdev_for_each_rcu(rdev, mddev1)
1929 rdev_for_each_rcu(rdev2, mddev2)
1930 if (rdev->bdev->bd_contains ==
1931 rdev2->bdev->bd_contains) {
1939 static LIST_HEAD(pending_raid_disks);
1942 * Try to register data integrity profile for an mddev
1944 * This is called when an array is started and after a disk has been kicked
1945 * from the array. It only succeeds if all working and active component devices
1946 * are integrity capable with matching profiles.
1948 int md_integrity_register(struct mddev *mddev)
1950 struct md_rdev *rdev, *reference = NULL;
1952 if (list_empty(&mddev->disks))
1953 return 0; /* nothing to do */
1954 if (!mddev->gendisk || blk_get_integrity(mddev->gendisk))
1955 return 0; /* shouldn't register, or already is */
1956 rdev_for_each(rdev, mddev) {
1957 /* skip spares and non-functional disks */
1958 if (test_bit(Faulty, &rdev->flags))
1960 if (rdev->raid_disk < 0)
1963 /* Use the first rdev as the reference */
1967 /* does this rdev's profile match the reference profile? */
1968 if (blk_integrity_compare(reference->bdev->bd_disk,
1969 rdev->bdev->bd_disk) < 0)
1972 if (!reference || !bdev_get_integrity(reference->bdev))
1975 * All component devices are integrity capable and have matching
1976 * profiles, register the common profile for the md device.
1978 if (blk_integrity_register(mddev->gendisk,
1979 bdev_get_integrity(reference->bdev)) != 0) {
1980 printk(KERN_ERR "md: failed to register integrity for %s\n",
1984 printk(KERN_NOTICE "md: data integrity enabled on %s\n", mdname(mddev));
1985 if (bioset_integrity_create(mddev->bio_set, BIO_POOL_SIZE)) {
1986 printk(KERN_ERR "md: failed to create integrity pool for %s\n",
1992 EXPORT_SYMBOL(md_integrity_register);
1994 /* Disable data integrity if non-capable/non-matching disk is being added */
1995 void md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev)
1997 struct blk_integrity *bi_rdev;
1998 struct blk_integrity *bi_mddev;
2000 if (!mddev->gendisk)
2003 bi_rdev = bdev_get_integrity(rdev->bdev);
2004 bi_mddev = blk_get_integrity(mddev->gendisk);
2006 if (!bi_mddev) /* nothing to do */
2008 if (rdev->raid_disk < 0) /* skip spares */
2010 if (bi_rdev && blk_integrity_compare(mddev->gendisk,
2011 rdev->bdev->bd_disk) >= 0)
2013 printk(KERN_NOTICE "disabling data integrity on %s\n", mdname(mddev));
2014 blk_integrity_unregister(mddev->gendisk);
2016 EXPORT_SYMBOL(md_integrity_add_rdev);
2018 static int bind_rdev_to_array(struct md_rdev *rdev, struct mddev *mddev)
2020 char b[BDEVNAME_SIZE];
2025 /* prevent duplicates */
2026 if (find_rdev(mddev, rdev->bdev->bd_dev))
2029 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2030 if (rdev->sectors && (mddev->dev_sectors == 0 ||
2031 rdev->sectors < mddev->dev_sectors)) {
2033 /* Cannot change size, so fail
2034 * If mddev->level <= 0, then we don't care
2035 * about aligning sizes (e.g. linear)
2037 if (mddev->level > 0)
2040 mddev->dev_sectors = rdev->sectors;
2043 /* Verify rdev->desc_nr is unique.
2044 * If it is -1, assign a free number, else
2045 * check number is not in use
2048 if (rdev->desc_nr < 0) {
2051 choice = mddev->raid_disks;
2052 while (find_rdev_nr_rcu(mddev, choice))
2054 rdev->desc_nr = choice;
2056 if (find_rdev_nr_rcu(mddev, rdev->desc_nr)) {
2062 if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) {
2063 printk(KERN_WARNING "md: %s: array is limited to %d devices\n",
2064 mdname(mddev), mddev->max_disks);
2067 bdevname(rdev->bdev,b);
2068 while ( (s=strchr(b, '/')) != NULL)
2071 rdev->mddev = mddev;
2072 printk(KERN_INFO "md: bind<%s>\n", b);
2074 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
2077 ko = &part_to_dev(rdev->bdev->bd_part)->kobj;
2078 if (sysfs_create_link(&rdev->kobj, ko, "block"))
2079 /* failure here is OK */;
2080 rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state");
2082 list_add_rcu(&rdev->same_set, &mddev->disks);
2083 bd_link_disk_holder(rdev->bdev, mddev->gendisk);
2085 /* May as well allow recovery to be retried once */
2086 mddev->recovery_disabled++;
2091 printk(KERN_WARNING "md: failed to register dev-%s for %s\n",
2096 static void md_delayed_delete(struct work_struct *ws)
2098 struct md_rdev *rdev = container_of(ws, struct md_rdev, del_work);
2099 kobject_del(&rdev->kobj);
2100 kobject_put(&rdev->kobj);
2103 static void unbind_rdev_from_array(struct md_rdev *rdev)
2105 char b[BDEVNAME_SIZE];
2107 bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk);
2108 list_del_rcu(&rdev->same_set);
2109 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
2111 sysfs_remove_link(&rdev->kobj, "block");
2112 sysfs_put(rdev->sysfs_state);
2113 rdev->sysfs_state = NULL;
2114 rdev->badblocks.count = 0;
2115 /* We need to delay this, otherwise we can deadlock when
2116 * writing to 'remove' to "dev/state". We also need
2117 * to delay it due to rcu usage.
2120 INIT_WORK(&rdev->del_work, md_delayed_delete);
2121 kobject_get(&rdev->kobj);
2122 queue_work(md_misc_wq, &rdev->del_work);
2126 * prevent the device from being mounted, repartitioned or
2127 * otherwise reused by a RAID array (or any other kernel
2128 * subsystem), by bd_claiming the device.
2130 static int lock_rdev(struct md_rdev *rdev, dev_t dev, int shared)
2133 struct block_device *bdev;
2134 char b[BDEVNAME_SIZE];
2136 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
2137 shared ? (struct md_rdev *)lock_rdev : rdev);
2139 printk(KERN_ERR "md: could not open %s.\n",
2140 __bdevname(dev, b));
2141 return PTR_ERR(bdev);
2147 static void unlock_rdev(struct md_rdev *rdev)
2149 struct block_device *bdev = rdev->bdev;
2151 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
2154 void md_autodetect_dev(dev_t dev);
2156 static void export_rdev(struct md_rdev *rdev)
2158 char b[BDEVNAME_SIZE];
2160 printk(KERN_INFO "md: export_rdev(%s)\n",
2161 bdevname(rdev->bdev,b));
2162 md_rdev_clear(rdev);
2164 if (test_bit(AutoDetected, &rdev->flags))
2165 md_autodetect_dev(rdev->bdev->bd_dev);
2168 kobject_put(&rdev->kobj);
2171 void md_kick_rdev_from_array(struct md_rdev *rdev)
2173 unbind_rdev_from_array(rdev);
2176 EXPORT_SYMBOL_GPL(md_kick_rdev_from_array);
2178 static void export_array(struct mddev *mddev)
2180 struct md_rdev *rdev;
2182 while (!list_empty(&mddev->disks)) {
2183 rdev = list_first_entry(&mddev->disks, struct md_rdev,
2185 md_kick_rdev_from_array(rdev);
2187 mddev->raid_disks = 0;
2188 mddev->major_version = 0;
2191 static void sync_sbs(struct mddev *mddev, int nospares)
2193 /* Update each superblock (in-memory image), but
2194 * if we are allowed to, skip spares which already
2195 * have the right event counter, or have one earlier
2196 * (which would mean they aren't being marked as dirty
2197 * with the rest of the array)
2199 struct md_rdev *rdev;
2200 rdev_for_each(rdev, mddev) {
2201 if (rdev->sb_events == mddev->events ||
2203 rdev->raid_disk < 0 &&
2204 rdev->sb_events+1 == mddev->events)) {
2205 /* Don't update this superblock */
2206 rdev->sb_loaded = 2;
2208 sync_super(mddev, rdev);
2209 rdev->sb_loaded = 1;
2214 void md_update_sb(struct mddev *mddev, int force_change)
2216 struct md_rdev *rdev;
2219 int any_badblocks_changed = 0;
2223 set_bit(MD_CHANGE_DEVS, &mddev->flags);
2227 /* First make sure individual recovery_offsets are correct */
2228 rdev_for_each(rdev, mddev) {
2229 if (rdev->raid_disk >= 0 &&
2230 mddev->delta_disks >= 0 &&
2231 !test_bit(In_sync, &rdev->flags) &&
2232 mddev->curr_resync_completed > rdev->recovery_offset)
2233 rdev->recovery_offset = mddev->curr_resync_completed;
2236 if (!mddev->persistent) {
2237 clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
2238 clear_bit(MD_CHANGE_DEVS, &mddev->flags);
2239 if (!mddev->external) {
2240 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2241 rdev_for_each(rdev, mddev) {
2242 if (rdev->badblocks.changed) {
2243 rdev->badblocks.changed = 0;
2244 md_ack_all_badblocks(&rdev->badblocks);
2245 md_error(mddev, rdev);
2247 clear_bit(Blocked, &rdev->flags);
2248 clear_bit(BlockedBadBlocks, &rdev->flags);
2249 wake_up(&rdev->blocked_wait);
2252 wake_up(&mddev->sb_wait);
2256 spin_lock(&mddev->lock);
2258 mddev->utime = get_seconds();
2260 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
2262 if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags))
2263 /* just a clean<-> dirty transition, possibly leave spares alone,
2264 * though if events isn't the right even/odd, we will have to do
2270 if (mddev->degraded)
2271 /* If the array is degraded, then skipping spares is both
2272 * dangerous and fairly pointless.
2273 * Dangerous because a device that was removed from the array
2274 * might have a event_count that still looks up-to-date,
2275 * so it can be re-added without a resync.
2276 * Pointless because if there are any spares to skip,
2277 * then a recovery will happen and soon that array won't
2278 * be degraded any more and the spare can go back to sleep then.
2282 sync_req = mddev->in_sync;
2284 /* If this is just a dirty<->clean transition, and the array is clean
2285 * and 'events' is odd, we can roll back to the previous clean state */
2287 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
2288 && mddev->can_decrease_events
2289 && mddev->events != 1) {
2291 mddev->can_decrease_events = 0;
2293 /* otherwise we have to go forward and ... */
2295 mddev->can_decrease_events = nospares;
2299 * This 64-bit counter should never wrap.
2300 * Either we are in around ~1 trillion A.C., assuming
2301 * 1 reboot per second, or we have a bug...
2303 WARN_ON(mddev->events == 0);
2305 rdev_for_each(rdev, mddev) {
2306 if (rdev->badblocks.changed)
2307 any_badblocks_changed++;
2308 if (test_bit(Faulty, &rdev->flags))
2309 set_bit(FaultRecorded, &rdev->flags);
2312 sync_sbs(mddev, nospares);
2313 spin_unlock(&mddev->lock);
2315 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2316 mdname(mddev), mddev->in_sync);
2318 bitmap_update_sb(mddev->bitmap);
2319 rdev_for_each(rdev, mddev) {
2320 char b[BDEVNAME_SIZE];
2322 if (rdev->sb_loaded != 1)
2323 continue; /* no noise on spare devices */
2325 if (!test_bit(Faulty, &rdev->flags)) {
2326 md_super_write(mddev,rdev,
2327 rdev->sb_start, rdev->sb_size,
2329 pr_debug("md: (write) %s's sb offset: %llu\n",
2330 bdevname(rdev->bdev, b),
2331 (unsigned long long)rdev->sb_start);
2332 rdev->sb_events = mddev->events;
2333 if (rdev->badblocks.size) {
2334 md_super_write(mddev, rdev,
2335 rdev->badblocks.sector,
2336 rdev->badblocks.size << 9,
2338 rdev->badblocks.size = 0;
2342 pr_debug("md: %s (skipping faulty)\n",
2343 bdevname(rdev->bdev, b));
2345 if (mddev->level == LEVEL_MULTIPATH)
2346 /* only need to write one superblock... */
2349 md_super_wait(mddev);
2350 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2352 spin_lock(&mddev->lock);
2353 if (mddev->in_sync != sync_req ||
2354 test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
2355 /* have to write it out again */
2356 spin_unlock(&mddev->lock);
2359 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2360 spin_unlock(&mddev->lock);
2361 wake_up(&mddev->sb_wait);
2362 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
2363 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
2365 rdev_for_each(rdev, mddev) {
2366 if (test_and_clear_bit(FaultRecorded, &rdev->flags))
2367 clear_bit(Blocked, &rdev->flags);
2369 if (any_badblocks_changed)
2370 md_ack_all_badblocks(&rdev->badblocks);
2371 clear_bit(BlockedBadBlocks, &rdev->flags);
2372 wake_up(&rdev->blocked_wait);
2375 EXPORT_SYMBOL(md_update_sb);
2377 /* words written to sysfs files may, or may not, be \n terminated.
2378 * We want to accept with case. For this we use cmd_match.
2380 static int cmd_match(const char *cmd, const char *str)
2382 /* See if cmd, written into a sysfs file, matches
2383 * str. They must either be the same, or cmd can
2384 * have a trailing newline
2386 while (*cmd && *str && *cmd == *str) {
2397 struct rdev_sysfs_entry {
2398 struct attribute attr;
2399 ssize_t (*show)(struct md_rdev *, char *);
2400 ssize_t (*store)(struct md_rdev *, const char *, size_t);
2404 state_show(struct md_rdev *rdev, char *page)
2408 unsigned long flags = ACCESS_ONCE(rdev->flags);
2410 if (test_bit(Faulty, &flags) ||
2411 rdev->badblocks.unacked_exist) {
2412 len+= sprintf(page+len, "%sfaulty",sep);
2415 if (test_bit(In_sync, &flags)) {
2416 len += sprintf(page+len, "%sin_sync",sep);
2419 if (test_bit(WriteMostly, &flags)) {
2420 len += sprintf(page+len, "%swrite_mostly",sep);
2423 if (test_bit(Blocked, &flags) ||
2424 (rdev->badblocks.unacked_exist
2425 && !test_bit(Faulty, &flags))) {
2426 len += sprintf(page+len, "%sblocked", sep);
2429 if (!test_bit(Faulty, &flags) &&
2430 !test_bit(In_sync, &flags)) {
2431 len += sprintf(page+len, "%sspare", sep);
2434 if (test_bit(WriteErrorSeen, &flags)) {
2435 len += sprintf(page+len, "%swrite_error", sep);
2438 if (test_bit(WantReplacement, &flags)) {
2439 len += sprintf(page+len, "%swant_replacement", sep);
2442 if (test_bit(Replacement, &flags)) {
2443 len += sprintf(page+len, "%sreplacement", sep);
2447 return len+sprintf(page+len, "\n");
2451 state_store(struct md_rdev *rdev, const char *buf, size_t len)
2454 * faulty - simulates an error
2455 * remove - disconnects the device
2456 * writemostly - sets write_mostly
2457 * -writemostly - clears write_mostly
2458 * blocked - sets the Blocked flags
2459 * -blocked - clears the Blocked and possibly simulates an error
2460 * insync - sets Insync providing device isn't active
2461 * -insync - clear Insync for a device with a slot assigned,
2462 * so that it gets rebuilt based on bitmap
2463 * write_error - sets WriteErrorSeen
2464 * -write_error - clears WriteErrorSeen
2467 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
2468 md_error(rdev->mddev, rdev);
2469 if (test_bit(Faulty, &rdev->flags))
2473 } else if (cmd_match(buf, "remove")) {
2474 if (rdev->raid_disk >= 0)
2477 struct mddev *mddev = rdev->mddev;
2478 if (mddev_is_clustered(mddev))
2479 md_cluster_ops->metadata_update_start(mddev);
2480 md_kick_rdev_from_array(rdev);
2482 md_update_sb(mddev, 1);
2483 md_new_event(mddev);
2484 if (mddev_is_clustered(mddev))
2485 md_cluster_ops->metadata_update_finish(mddev);
2488 } else if (cmd_match(buf, "writemostly")) {
2489 set_bit(WriteMostly, &rdev->flags);
2491 } else if (cmd_match(buf, "-writemostly")) {
2492 clear_bit(WriteMostly, &rdev->flags);
2494 } else if (cmd_match(buf, "blocked")) {
2495 set_bit(Blocked, &rdev->flags);
2497 } else if (cmd_match(buf, "-blocked")) {
2498 if (!test_bit(Faulty, &rdev->flags) &&
2499 rdev->badblocks.unacked_exist) {
2500 /* metadata handler doesn't understand badblocks,
2501 * so we need to fail the device
2503 md_error(rdev->mddev, rdev);
2505 clear_bit(Blocked, &rdev->flags);
2506 clear_bit(BlockedBadBlocks, &rdev->flags);
2507 wake_up(&rdev->blocked_wait);
2508 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2509 md_wakeup_thread(rdev->mddev->thread);
2512 } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) {
2513 set_bit(In_sync, &rdev->flags);
2515 } else if (cmd_match(buf, "-insync") && rdev->raid_disk >= 0) {
2516 if (rdev->mddev->pers == NULL) {
2517 clear_bit(In_sync, &rdev->flags);
2518 rdev->saved_raid_disk = rdev->raid_disk;
2519 rdev->raid_disk = -1;
2522 } else if (cmd_match(buf, "write_error")) {
2523 set_bit(WriteErrorSeen, &rdev->flags);
2525 } else if (cmd_match(buf, "-write_error")) {
2526 clear_bit(WriteErrorSeen, &rdev->flags);
2528 } else if (cmd_match(buf, "want_replacement")) {
2529 /* Any non-spare device that is not a replacement can
2530 * become want_replacement at any time, but we then need to
2531 * check if recovery is needed.
2533 if (rdev->raid_disk >= 0 &&
2534 !test_bit(Replacement, &rdev->flags))
2535 set_bit(WantReplacement, &rdev->flags);
2536 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2537 md_wakeup_thread(rdev->mddev->thread);
2539 } else if (cmd_match(buf, "-want_replacement")) {
2540 /* Clearing 'want_replacement' is always allowed.
2541 * Once replacements starts it is too late though.
2544 clear_bit(WantReplacement, &rdev->flags);
2545 } else if (cmd_match(buf, "replacement")) {
2546 /* Can only set a device as a replacement when array has not
2547 * yet been started. Once running, replacement is automatic
2548 * from spares, or by assigning 'slot'.
2550 if (rdev->mddev->pers)
2553 set_bit(Replacement, &rdev->flags);
2556 } else if (cmd_match(buf, "-replacement")) {
2557 /* Similarly, can only clear Replacement before start */
2558 if (rdev->mddev->pers)
2561 clear_bit(Replacement, &rdev->flags);
2566 sysfs_notify_dirent_safe(rdev->sysfs_state);
2567 return err ? err : len;
2569 static struct rdev_sysfs_entry rdev_state =
2570 __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store);
2573 errors_show(struct md_rdev *rdev, char *page)
2575 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
2579 errors_store(struct md_rdev *rdev, const char *buf, size_t len)
2582 unsigned long n = simple_strtoul(buf, &e, 10);
2583 if (*buf && (*e == 0 || *e == '\n')) {
2584 atomic_set(&rdev->corrected_errors, n);
2589 static struct rdev_sysfs_entry rdev_errors =
2590 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
2593 slot_show(struct md_rdev *rdev, char *page)
2595 if (rdev->raid_disk < 0)
2596 return sprintf(page, "none\n");
2598 return sprintf(page, "%d\n", rdev->raid_disk);
2602 slot_store(struct md_rdev *rdev, const char *buf, size_t len)
2606 int slot = simple_strtoul(buf, &e, 10);
2607 if (strncmp(buf, "none", 4)==0)
2609 else if (e==buf || (*e && *e!= '\n'))
2611 if (rdev->mddev->pers && slot == -1) {
2612 /* Setting 'slot' on an active array requires also
2613 * updating the 'rd%d' link, and communicating
2614 * with the personality with ->hot_*_disk.
2615 * For now we only support removing
2616 * failed/spare devices. This normally happens automatically,
2617 * but not when the metadata is externally managed.
2619 if (rdev->raid_disk == -1)
2621 /* personality does all needed checks */
2622 if (rdev->mddev->pers->hot_remove_disk == NULL)
2624 clear_bit(Blocked, &rdev->flags);
2625 remove_and_add_spares(rdev->mddev, rdev);
2626 if (rdev->raid_disk >= 0)
2628 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2629 md_wakeup_thread(rdev->mddev->thread);
2630 } else if (rdev->mddev->pers) {
2631 /* Activating a spare .. or possibly reactivating
2632 * if we ever get bitmaps working here.
2635 if (rdev->raid_disk != -1)
2638 if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery))
2641 if (rdev->mddev->pers->hot_add_disk == NULL)
2644 if (slot >= rdev->mddev->raid_disks &&
2645 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
2648 rdev->raid_disk = slot;
2649 if (test_bit(In_sync, &rdev->flags))
2650 rdev->saved_raid_disk = slot;
2652 rdev->saved_raid_disk = -1;
2653 clear_bit(In_sync, &rdev->flags);
2654 clear_bit(Bitmap_sync, &rdev->flags);
2655 err = rdev->mddev->pers->
2656 hot_add_disk(rdev->mddev, rdev);
2658 rdev->raid_disk = -1;
2661 sysfs_notify_dirent_safe(rdev->sysfs_state);
2662 if (sysfs_link_rdev(rdev->mddev, rdev))
2663 /* failure here is OK */;
2664 /* don't wakeup anyone, leave that to userspace. */
2666 if (slot >= rdev->mddev->raid_disks &&
2667 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
2669 rdev->raid_disk = slot;
2670 /* assume it is working */
2671 clear_bit(Faulty, &rdev->flags);
2672 clear_bit(WriteMostly, &rdev->flags);
2673 set_bit(In_sync, &rdev->flags);
2674 sysfs_notify_dirent_safe(rdev->sysfs_state);
2679 static struct rdev_sysfs_entry rdev_slot =
2680 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
2683 offset_show(struct md_rdev *rdev, char *page)
2685 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
2689 offset_store(struct md_rdev *rdev, const char *buf, size_t len)
2691 unsigned long long offset;
2692 if (kstrtoull(buf, 10, &offset) < 0)
2694 if (rdev->mddev->pers && rdev->raid_disk >= 0)
2696 if (rdev->sectors && rdev->mddev->external)
2697 /* Must set offset before size, so overlap checks
2700 rdev->data_offset = offset;
2701 rdev->new_data_offset = offset;
2705 static struct rdev_sysfs_entry rdev_offset =
2706 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
2708 static ssize_t new_offset_show(struct md_rdev *rdev, char *page)
2710 return sprintf(page, "%llu\n",
2711 (unsigned long long)rdev->new_data_offset);
2714 static ssize_t new_offset_store(struct md_rdev *rdev,
2715 const char *buf, size_t len)
2717 unsigned long long new_offset;
2718 struct mddev *mddev = rdev->mddev;
2720 if (kstrtoull(buf, 10, &new_offset) < 0)
2723 if (mddev->sync_thread ||
2724 test_bit(MD_RECOVERY_RUNNING,&mddev->recovery))
2726 if (new_offset == rdev->data_offset)
2727 /* reset is always permitted */
2729 else if (new_offset > rdev->data_offset) {
2730 /* must not push array size beyond rdev_sectors */
2731 if (new_offset - rdev->data_offset
2732 + mddev->dev_sectors > rdev->sectors)
2735 /* Metadata worries about other space details. */
2737 /* decreasing the offset is inconsistent with a backwards
2740 if (new_offset < rdev->data_offset &&
2741 mddev->reshape_backwards)
2743 /* Increasing offset is inconsistent with forwards
2744 * reshape. reshape_direction should be set to
2745 * 'backwards' first.
2747 if (new_offset > rdev->data_offset &&
2748 !mddev->reshape_backwards)
2751 if (mddev->pers && mddev->persistent &&
2752 !super_types[mddev->major_version]
2753 .allow_new_offset(rdev, new_offset))
2755 rdev->new_data_offset = new_offset;
2756 if (new_offset > rdev->data_offset)
2757 mddev->reshape_backwards = 1;
2758 else if (new_offset < rdev->data_offset)
2759 mddev->reshape_backwards = 0;
2763 static struct rdev_sysfs_entry rdev_new_offset =
2764 __ATTR(new_offset, S_IRUGO|S_IWUSR, new_offset_show, new_offset_store);
2767 rdev_size_show(struct md_rdev *rdev, char *page)
2769 return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2);
2772 static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
2774 /* check if two start/length pairs overlap */
2782 static int strict_blocks_to_sectors(const char *buf, sector_t *sectors)
2784 unsigned long long blocks;
2787 if (kstrtoull(buf, 10, &blocks) < 0)
2790 if (blocks & 1ULL << (8 * sizeof(blocks) - 1))
2791 return -EINVAL; /* sector conversion overflow */
2794 if (new != blocks * 2)
2795 return -EINVAL; /* unsigned long long to sector_t overflow */
2802 rdev_size_store(struct md_rdev *rdev, const char *buf, size_t len)
2804 struct mddev *my_mddev = rdev->mddev;
2805 sector_t oldsectors = rdev->sectors;
2808 if (strict_blocks_to_sectors(buf, §ors) < 0)
2810 if (rdev->data_offset != rdev->new_data_offset)
2811 return -EINVAL; /* too confusing */
2812 if (my_mddev->pers && rdev->raid_disk >= 0) {
2813 if (my_mddev->persistent) {
2814 sectors = super_types[my_mddev->major_version].
2815 rdev_size_change(rdev, sectors);
2818 } else if (!sectors)
2819 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) -
2821 if (!my_mddev->pers->resize)
2822 /* Cannot change size for RAID0 or Linear etc */
2825 if (sectors < my_mddev->dev_sectors)
2826 return -EINVAL; /* component must fit device */
2828 rdev->sectors = sectors;
2829 if (sectors > oldsectors && my_mddev->external) {
2830 /* Need to check that all other rdevs with the same
2831 * ->bdev do not overlap. 'rcu' is sufficient to walk
2832 * the rdev lists safely.
2833 * This check does not provide a hard guarantee, it
2834 * just helps avoid dangerous mistakes.
2836 struct mddev *mddev;
2838 struct list_head *tmp;
2841 for_each_mddev(mddev, tmp) {
2842 struct md_rdev *rdev2;
2844 rdev_for_each(rdev2, mddev)
2845 if (rdev->bdev == rdev2->bdev &&
2847 overlaps(rdev->data_offset, rdev->sectors,
2860 /* Someone else could have slipped in a size
2861 * change here, but doing so is just silly.
2862 * We put oldsectors back because we *know* it is
2863 * safe, and trust userspace not to race with
2866 rdev->sectors = oldsectors;
2873 static struct rdev_sysfs_entry rdev_size =
2874 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
2876 static ssize_t recovery_start_show(struct md_rdev *rdev, char *page)
2878 unsigned long long recovery_start = rdev->recovery_offset;
2880 if (test_bit(In_sync, &rdev->flags) ||
2881 recovery_start == MaxSector)
2882 return sprintf(page, "none\n");
2884 return sprintf(page, "%llu\n", recovery_start);
2887 static ssize_t recovery_start_store(struct md_rdev *rdev, const char *buf, size_t len)
2889 unsigned long long recovery_start;
2891 if (cmd_match(buf, "none"))
2892 recovery_start = MaxSector;
2893 else if (kstrtoull(buf, 10, &recovery_start))
2896 if (rdev->mddev->pers &&
2897 rdev->raid_disk >= 0)
2900 rdev->recovery_offset = recovery_start;
2901 if (recovery_start == MaxSector)
2902 set_bit(In_sync, &rdev->flags);
2904 clear_bit(In_sync, &rdev->flags);
2908 static struct rdev_sysfs_entry rdev_recovery_start =
2909 __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store);
2912 badblocks_show(struct badblocks *bb, char *page, int unack);
2914 badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack);
2916 static ssize_t bb_show(struct md_rdev *rdev, char *page)
2918 return badblocks_show(&rdev->badblocks, page, 0);
2920 static ssize_t bb_store(struct md_rdev *rdev, const char *page, size_t len)
2922 int rv = badblocks_store(&rdev->badblocks, page, len, 0);
2923 /* Maybe that ack was all we needed */
2924 if (test_and_clear_bit(BlockedBadBlocks, &rdev->flags))
2925 wake_up(&rdev->blocked_wait);
2928 static struct rdev_sysfs_entry rdev_bad_blocks =
2929 __ATTR(bad_blocks, S_IRUGO|S_IWUSR, bb_show, bb_store);
2931 static ssize_t ubb_show(struct md_rdev *rdev, char *page)
2933 return badblocks_show(&rdev->badblocks, page, 1);
2935 static ssize_t ubb_store(struct md_rdev *rdev, const char *page, size_t len)
2937 return badblocks_store(&rdev->badblocks, page, len, 1);
2939 static struct rdev_sysfs_entry rdev_unack_bad_blocks =
2940 __ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store);
2942 static struct attribute *rdev_default_attrs[] = {
2947 &rdev_new_offset.attr,
2949 &rdev_recovery_start.attr,
2950 &rdev_bad_blocks.attr,
2951 &rdev_unack_bad_blocks.attr,
2955 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
2957 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2958 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
2964 return entry->show(rdev, page);
2968 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
2969 const char *page, size_t length)
2971 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2972 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
2974 struct mddev *mddev = rdev->mddev;
2978 if (!capable(CAP_SYS_ADMIN))
2980 rv = mddev ? mddev_lock(mddev): -EBUSY;
2982 if (rdev->mddev == NULL)
2985 rv = entry->store(rdev, page, length);
2986 mddev_unlock(mddev);
2991 static void rdev_free(struct kobject *ko)
2993 struct md_rdev *rdev = container_of(ko, struct md_rdev, kobj);
2996 static const struct sysfs_ops rdev_sysfs_ops = {
2997 .show = rdev_attr_show,
2998 .store = rdev_attr_store,
3000 static struct kobj_type rdev_ktype = {
3001 .release = rdev_free,
3002 .sysfs_ops = &rdev_sysfs_ops,
3003 .default_attrs = rdev_default_attrs,
3006 int md_rdev_init(struct md_rdev *rdev)
3009 rdev->saved_raid_disk = -1;
3010 rdev->raid_disk = -1;
3012 rdev->data_offset = 0;
3013 rdev->new_data_offset = 0;
3014 rdev->sb_events = 0;
3015 rdev->last_read_error.tv_sec = 0;
3016 rdev->last_read_error.tv_nsec = 0;
3017 rdev->sb_loaded = 0;
3018 rdev->bb_page = NULL;
3019 atomic_set(&rdev->nr_pending, 0);
3020 atomic_set(&rdev->read_errors, 0);
3021 atomic_set(&rdev->corrected_errors, 0);
3023 INIT_LIST_HEAD(&rdev->same_set);
3024 init_waitqueue_head(&rdev->blocked_wait);
3026 /* Add space to store bad block list.
3027 * This reserves the space even on arrays where it cannot
3028 * be used - I wonder if that matters
3030 rdev->badblocks.count = 0;
3031 rdev->badblocks.shift = -1; /* disabled until explicitly enabled */
3032 rdev->badblocks.page = kmalloc(PAGE_SIZE, GFP_KERNEL);
3033 seqlock_init(&rdev->badblocks.lock);
3034 if (rdev->badblocks.page == NULL)
3039 EXPORT_SYMBOL_GPL(md_rdev_init);
3041 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3043 * mark the device faulty if:
3045 * - the device is nonexistent (zero size)
3046 * - the device has no valid superblock
3048 * a faulty rdev _never_ has rdev->sb set.
3050 static struct md_rdev *md_import_device(dev_t newdev, int super_format, int super_minor)
3052 char b[BDEVNAME_SIZE];
3054 struct md_rdev *rdev;
3057 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
3059 printk(KERN_ERR "md: could not alloc mem for new device!\n");
3060 return ERR_PTR(-ENOMEM);
3063 err = md_rdev_init(rdev);
3066 err = alloc_disk_sb(rdev);
3070 err = lock_rdev(rdev, newdev, super_format == -2);
3074 kobject_init(&rdev->kobj, &rdev_ktype);
3076 size = i_size_read(rdev->bdev->bd_inode) >> BLOCK_SIZE_BITS;
3079 "md: %s has zero or unknown size, marking faulty!\n",
3080 bdevname(rdev->bdev,b));
3085 if (super_format >= 0) {
3086 err = super_types[super_format].
3087 load_super(rdev, NULL, super_minor);
3088 if (err == -EINVAL) {
3090 "md: %s does not have a valid v%d.%d "
3091 "superblock, not importing!\n",
3092 bdevname(rdev->bdev,b),
3093 super_format, super_minor);
3098 "md: could not read %s's sb, not importing!\n",
3099 bdevname(rdev->bdev,b));
3109 md_rdev_clear(rdev);
3111 return ERR_PTR(err);
3115 * Check a full RAID array for plausibility
3118 static void analyze_sbs(struct mddev *mddev)
3121 struct md_rdev *rdev, *freshest, *tmp;
3122 char b[BDEVNAME_SIZE];
3125 rdev_for_each_safe(rdev, tmp, mddev)
3126 switch (super_types[mddev->major_version].
3127 load_super(rdev, freshest, mddev->minor_version)) {
3135 "md: fatal superblock inconsistency in %s"
3136 " -- removing from array\n",
3137 bdevname(rdev->bdev,b));
3138 md_kick_rdev_from_array(rdev);
3141 super_types[mddev->major_version].
3142 validate_super(mddev, freshest);
3145 rdev_for_each_safe(rdev, tmp, mddev) {
3146 if (mddev->max_disks &&
3147 (rdev->desc_nr >= mddev->max_disks ||
3148 i > mddev->max_disks)) {
3150 "md: %s: %s: only %d devices permitted\n",
3151 mdname(mddev), bdevname(rdev->bdev, b),
3153 md_kick_rdev_from_array(rdev);
3156 if (rdev != freshest) {
3157 if (super_types[mddev->major_version].
3158 validate_super(mddev, rdev)) {
3159 printk(KERN_WARNING "md: kicking non-fresh %s"
3161 bdevname(rdev->bdev,b));
3162 md_kick_rdev_from_array(rdev);
3165 /* No device should have a Candidate flag
3166 * when reading devices
3168 if (test_bit(Candidate, &rdev->flags)) {
3169 pr_info("md: kicking Cluster Candidate %s from array!\n",
3170 bdevname(rdev->bdev, b));
3171 md_kick_rdev_from_array(rdev);
3174 if (mddev->level == LEVEL_MULTIPATH) {
3175 rdev->desc_nr = i++;
3176 rdev->raid_disk = rdev->desc_nr;
3177 set_bit(In_sync, &rdev->flags);
3178 } else if (rdev->raid_disk >= (mddev->raid_disks - min(0, mddev->delta_disks))) {
3179 rdev->raid_disk = -1;
3180 clear_bit(In_sync, &rdev->flags);
3185 /* Read a fixed-point number.
3186 * Numbers in sysfs attributes should be in "standard" units where
3187 * possible, so time should be in seconds.
3188 * However we internally use a a much smaller unit such as
3189 * milliseconds or jiffies.
3190 * This function takes a decimal number with a possible fractional
3191 * component, and produces an integer which is the result of
3192 * multiplying that number by 10^'scale'.
3193 * all without any floating-point arithmetic.
3195 int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale)
3197 unsigned long result = 0;
3199 while (isdigit(*cp) || (*cp == '.' && decimals < 0)) {
3202 else if (decimals < scale) {
3205 result = result * 10 + value;
3217 while (decimals < scale) {
3225 static void md_safemode_timeout(unsigned long data);
3228 safe_delay_show(struct mddev *mddev, char *page)
3230 int msec = (mddev->safemode_delay*1000)/HZ;
3231 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
3234 safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len)
3238 if (strict_strtoul_scaled(cbuf, &msec, 3) < 0)
3241 mddev->safemode_delay = 0;
3243 unsigned long old_delay = mddev->safemode_delay;
3244 unsigned long new_delay = (msec*HZ)/1000;
3248 mddev->safemode_delay = new_delay;
3249 if (new_delay < old_delay || old_delay == 0)
3250 mod_timer(&mddev->safemode_timer, jiffies+1);
3254 static struct md_sysfs_entry md_safe_delay =
3255 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
3258 level_show(struct mddev *mddev, char *page)
3260 struct md_personality *p;
3262 spin_lock(&mddev->lock);
3265 ret = sprintf(page, "%s\n", p->name);
3266 else if (mddev->clevel[0])
3267 ret = sprintf(page, "%s\n", mddev->clevel);
3268 else if (mddev->level != LEVEL_NONE)
3269 ret = sprintf(page, "%d\n", mddev->level);
3272 spin_unlock(&mddev->lock);
3277 level_store(struct mddev *mddev, const char *buf, size_t len)
3282 struct md_personality *pers, *oldpers;
3284 void *priv, *oldpriv;
3285 struct md_rdev *rdev;
3287 if (slen == 0 || slen >= sizeof(clevel))
3290 rv = mddev_lock(mddev);
3294 if (mddev->pers == NULL) {
3295 strncpy(mddev->clevel, buf, slen);
3296 if (mddev->clevel[slen-1] == '\n')
3298 mddev->clevel[slen] = 0;
3299 mddev->level = LEVEL_NONE;
3307 /* request to change the personality. Need to ensure:
3308 * - array is not engaged in resync/recovery/reshape
3309 * - old personality can be suspended
3310 * - new personality will access other array.
3314 if (mddev->sync_thread ||
3315 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3316 mddev->reshape_position != MaxSector ||
3317 mddev->sysfs_active)
3321 if (!mddev->pers->quiesce) {
3322 printk(KERN_WARNING "md: %s: %s does not support online personality change\n",
3323 mdname(mddev), mddev->pers->name);
3327 /* Now find the new personality */
3328 strncpy(clevel, buf, slen);
3329 if (clevel[slen-1] == '\n')
3332 if (kstrtol(clevel, 10, &level))
3335 if (request_module("md-%s", clevel) != 0)
3336 request_module("md-level-%s", clevel);
3337 spin_lock(&pers_lock);
3338 pers = find_pers(level, clevel);
3339 if (!pers || !try_module_get(pers->owner)) {
3340 spin_unlock(&pers_lock);
3341 printk(KERN_WARNING "md: personality %s not loaded\n", clevel);
3345 spin_unlock(&pers_lock);
3347 if (pers == mddev->pers) {
3348 /* Nothing to do! */
3349 module_put(pers->owner);
3353 if (!pers->takeover) {
3354 module_put(pers->owner);
3355 printk(KERN_WARNING "md: %s: %s does not support personality takeover\n",
3356 mdname(mddev), clevel);
3361 rdev_for_each(rdev, mddev)
3362 rdev->new_raid_disk = rdev->raid_disk;
3364 /* ->takeover must set new_* and/or delta_disks
3365 * if it succeeds, and may set them when it fails.
3367 priv = pers->takeover(mddev);
3369 mddev->new_level = mddev->level;
3370 mddev->new_layout = mddev->layout;
3371 mddev->new_chunk_sectors = mddev->chunk_sectors;
3372 mddev->raid_disks -= mddev->delta_disks;
3373 mddev->delta_disks = 0;
3374 mddev->reshape_backwards = 0;
3375 module_put(pers->owner);
3376 printk(KERN_WARNING "md: %s: %s would not accept array\n",
3377 mdname(mddev), clevel);
3382 /* Looks like we have a winner */
3383 mddev_suspend(mddev);
3384 mddev_detach(mddev);
3386 spin_lock(&mddev->lock);
3387 oldpers = mddev->pers;
3388 oldpriv = mddev->private;
3390 mddev->private = priv;
3391 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
3392 mddev->level = mddev->new_level;
3393 mddev->layout = mddev->new_layout;
3394 mddev->chunk_sectors = mddev->new_chunk_sectors;
3395 mddev->delta_disks = 0;
3396 mddev->reshape_backwards = 0;
3397 mddev->degraded = 0;
3398 spin_unlock(&mddev->lock);
3400 if (oldpers->sync_request == NULL &&
3402 /* We are converting from a no-redundancy array
3403 * to a redundancy array and metadata is managed
3404 * externally so we need to be sure that writes
3405 * won't block due to a need to transition
3407 * until external management is started.
3410 mddev->safemode_delay = 0;
3411 mddev->safemode = 0;
3414 oldpers->free(mddev, oldpriv);
3416 if (oldpers->sync_request == NULL &&
3417 pers->sync_request != NULL) {
3418 /* need to add the md_redundancy_group */
3419 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
3421 "md: cannot register extra attributes for %s\n",
3423 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action");
3425 if (oldpers->sync_request != NULL &&
3426 pers->sync_request == NULL) {
3427 /* need to remove the md_redundancy_group */
3428 if (mddev->to_remove == NULL)
3429 mddev->to_remove = &md_redundancy_group;
3432 rdev_for_each(rdev, mddev) {
3433 if (rdev->raid_disk < 0)
3435 if (rdev->new_raid_disk >= mddev->raid_disks)
3436 rdev->new_raid_disk = -1;
3437 if (rdev->new_raid_disk == rdev->raid_disk)
3439 sysfs_unlink_rdev(mddev, rdev);
3441 rdev_for_each(rdev, mddev) {
3442 if (rdev->raid_disk < 0)
3444 if (rdev->new_raid_disk == rdev->raid_disk)
3446 rdev->raid_disk = rdev->new_raid_disk;
3447 if (rdev->raid_disk < 0)
3448 clear_bit(In_sync, &rdev->flags);
3450 if (sysfs_link_rdev(mddev, rdev))
3451 printk(KERN_WARNING "md: cannot register rd%d"
3452 " for %s after level change\n",
3453 rdev->raid_disk, mdname(mddev));
3457 if (pers->sync_request == NULL) {
3458 /* this is now an array without redundancy, so
3459 * it must always be in_sync
3462 del_timer_sync(&mddev->safemode_timer);
3464 blk_set_stacking_limits(&mddev->queue->limits);
3466 set_bit(MD_CHANGE_DEVS, &mddev->flags);
3467 mddev_resume(mddev);
3469 md_update_sb(mddev, 1);
3470 sysfs_notify(&mddev->kobj, NULL, "level");
3471 md_new_event(mddev);
3474 mddev_unlock(mddev);
3478 static struct md_sysfs_entry md_level =
3479 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
3482 layout_show(struct mddev *mddev, char *page)
3484 /* just a number, not meaningful for all levels */
3485 if (mddev->reshape_position != MaxSector &&
3486 mddev->layout != mddev->new_layout)
3487 return sprintf(page, "%d (%d)\n",
3488 mddev->new_layout, mddev->layout);
3489 return sprintf(page, "%d\n", mddev->layout);
3493 layout_store(struct mddev *mddev, const char *buf, size_t len)
3496 unsigned long n = simple_strtoul(buf, &e, 10);
3499 if (!*buf || (*e && *e != '\n'))
3501 err = mddev_lock(mddev);
3506 if (mddev->pers->check_reshape == NULL)
3511 mddev->new_layout = n;
3512 err = mddev->pers->check_reshape(mddev);
3514 mddev->new_layout = mddev->layout;
3517 mddev->new_layout = n;
3518 if (mddev->reshape_position == MaxSector)
3521 mddev_unlock(mddev);
3524 static struct md_sysfs_entry md_layout =
3525 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
3528 raid_disks_show(struct mddev *mddev, char *page)
3530 if (mddev->raid_disks == 0)
3532 if (mddev->reshape_position != MaxSector &&
3533 mddev->delta_disks != 0)
3534 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
3535 mddev->raid_disks - mddev->delta_disks);
3536 return sprintf(page, "%d\n", mddev->raid_disks);
3539 static int update_raid_disks(struct mddev *mddev, int raid_disks);
3542 raid_disks_store(struct mddev *mddev, const char *buf, size_t len)
3546 unsigned long n = simple_strtoul(buf, &e, 10);
3548 if (!*buf || (*e && *e != '\n'))
3551 err = mddev_lock(mddev);
3555 err = update_raid_disks(mddev, n);
3556 else if (mddev->reshape_position != MaxSector) {
3557 struct md_rdev *rdev;
3558 int olddisks = mddev->raid_disks - mddev->delta_disks;
3561 rdev_for_each(rdev, mddev) {
3563 rdev->data_offset < rdev->new_data_offset)
3566 rdev->data_offset > rdev->new_data_offset)
3570 mddev->delta_disks = n - olddisks;
3571 mddev->raid_disks = n;
3572 mddev->reshape_backwards = (mddev->delta_disks < 0);
3574 mddev->raid_disks = n;
3576 mddev_unlock(mddev);
3577 return err ? err : len;
3579 static struct md_sysfs_entry md_raid_disks =
3580 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
3583 chunk_size_show(struct mddev *mddev, char *page)
3585 if (mddev->reshape_position != MaxSector &&
3586 mddev->chunk_sectors != mddev->new_chunk_sectors)
3587 return sprintf(page, "%d (%d)\n",
3588 mddev->new_chunk_sectors << 9,
3589 mddev->chunk_sectors << 9);
3590 return sprintf(page, "%d\n", mddev->chunk_sectors << 9);
3594 chunk_size_store(struct mddev *mddev, const char *buf, size_t len)
3598 unsigned long n = simple_strtoul(buf, &e, 10);
3600 if (!*buf || (*e && *e != '\n'))
3603 err = mddev_lock(mddev);
3607 if (mddev->pers->check_reshape == NULL)
3612 mddev->new_chunk_sectors = n >> 9;
3613 err = mddev->pers->check_reshape(mddev);
3615 mddev->new_chunk_sectors = mddev->chunk_sectors;
3618 mddev->new_chunk_sectors = n >> 9;
3619 if (mddev->reshape_position == MaxSector)
3620 mddev->chunk_sectors = n >> 9;
3622 mddev_unlock(mddev);
3625 static struct md_sysfs_entry md_chunk_size =
3626 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
3629 resync_start_show(struct mddev *mddev, char *page)
3631 if (mddev->recovery_cp == MaxSector)
3632 return sprintf(page, "none\n");
3633 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
3637 resync_start_store(struct mddev *mddev, const char *buf, size_t len)
3641 unsigned long long n = simple_strtoull(buf, &e, 10);
3643 err = mddev_lock(mddev);
3646 if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
3648 else if (cmd_match(buf, "none"))
3650 else if (!*buf || (*e && *e != '\n'))
3654 mddev->recovery_cp = n;
3656 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
3658 mddev_unlock(mddev);
3661 static struct md_sysfs_entry md_resync_start =
3662 __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store);
3665 * The array state can be:
3668 * No devices, no size, no level
3669 * Equivalent to STOP_ARRAY ioctl
3671 * May have some settings, but array is not active
3672 * all IO results in error
3673 * When written, doesn't tear down array, but just stops it
3674 * suspended (not supported yet)
3675 * All IO requests will block. The array can be reconfigured.
3676 * Writing this, if accepted, will block until array is quiescent
3678 * no resync can happen. no superblocks get written.
3679 * write requests fail
3681 * like readonly, but behaves like 'clean' on a write request.
3683 * clean - no pending writes, but otherwise active.
3684 * When written to inactive array, starts without resync
3685 * If a write request arrives then
3686 * if metadata is known, mark 'dirty' and switch to 'active'.
3687 * if not known, block and switch to write-pending
3688 * If written to an active array that has pending writes, then fails.
3690 * fully active: IO and resync can be happening.
3691 * When written to inactive array, starts with resync
3694 * clean, but writes are blocked waiting for 'active' to be written.
3697 * like active, but no writes have been seen for a while (100msec).
3700 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
3701 write_pending, active_idle, bad_word};
3702 static char *array_states[] = {
3703 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3704 "write-pending", "active-idle", NULL };
3706 static int match_word(const char *word, char **list)
3709 for (n=0; list[n]; n++)
3710 if (cmd_match(word, list[n]))
3716 array_state_show(struct mddev *mddev, char *page)
3718 enum array_state st = inactive;
3731 else if (test_bit(MD_CHANGE_PENDING, &mddev->flags))
3733 else if (mddev->safemode)
3739 if (list_empty(&mddev->disks) &&
3740 mddev->raid_disks == 0 &&
3741 mddev->dev_sectors == 0)
3746 return sprintf(page, "%s\n", array_states[st]);
3749 static int do_md_stop(struct mddev *mddev, int ro, struct block_device *bdev);
3750 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev);
3751 static int do_md_run(struct mddev *mddev);
3752 static int restart_array(struct mddev *mddev);
3755 array_state_store(struct mddev *mddev, const char *buf, size_t len)
3758 enum array_state st = match_word(buf, array_states);
3760 if (mddev->pers && (st == active || st == clean) && mddev->ro != 1) {
3761 /* don't take reconfig_mutex when toggling between
3764 spin_lock(&mddev->lock);
3766 restart_array(mddev);
3767 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
3768 wake_up(&mddev->sb_wait);
3770 } else /* st == clean */ {
3771 restart_array(mddev);
3772 if (atomic_read(&mddev->writes_pending) == 0) {
3773 if (mddev->in_sync == 0) {
3775 if (mddev->safemode == 1)
3776 mddev->safemode = 0;
3777 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
3783 spin_unlock(&mddev->lock);
3786 err = mddev_lock(mddev);
3794 /* stopping an active array */
3795 err = do_md_stop(mddev, 0, NULL);
3798 /* stopping an active array */
3800 err = do_md_stop(mddev, 2, NULL);
3802 err = 0; /* already inactive */
3805 break; /* not supported yet */
3808 err = md_set_readonly(mddev, NULL);
3811 set_disk_ro(mddev->gendisk, 1);
3812 err = do_md_run(mddev);
3818 err = md_set_readonly(mddev, NULL);
3819 else if (mddev->ro == 1)
3820 err = restart_array(mddev);
3823 set_disk_ro(mddev->gendisk, 0);
3827 err = do_md_run(mddev);
3832 restart_array(mddev);
3833 spin_lock(&mddev->lock);
3834 if (atomic_read(&mddev->writes_pending) == 0) {
3835 if (mddev->in_sync == 0) {
3837 if (mddev->safemode == 1)
3838 mddev->safemode = 0;
3839 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
3844 spin_unlock(&mddev->lock);
3850 restart_array(mddev);
3851 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
3852 wake_up(&mddev->sb_wait);
3856 set_disk_ro(mddev->gendisk, 0);
3857 err = do_md_run(mddev);
3862 /* these cannot be set */
3867 if (mddev->hold_active == UNTIL_IOCTL)
3868 mddev->hold_active = 0;
3869 sysfs_notify_dirent_safe(mddev->sysfs_state);
3871 mddev_unlock(mddev);
3874 static struct md_sysfs_entry md_array_state =
3875 __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
3878 max_corrected_read_errors_show(struct mddev *mddev, char *page) {
3879 return sprintf(page, "%d\n",
3880 atomic_read(&mddev->max_corr_read_errors));
3884 max_corrected_read_errors_store(struct mddev *mddev, const char *buf, size_t len)
3887 unsigned long n = simple_strtoul(buf, &e, 10);
3889 if (*buf && (*e == 0 || *e == '\n')) {
3890 atomic_set(&mddev->max_corr_read_errors, n);
3896 static struct md_sysfs_entry max_corr_read_errors =
3897 __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show,
3898 max_corrected_read_errors_store);
3901 null_show(struct mddev *mddev, char *page)
3907 new_dev_store(struct mddev *mddev, const char *buf, size_t len)
3909 /* buf must be %d:%d\n? giving major and minor numbers */
3910 /* The new device is added to the array.
3911 * If the array has a persistent superblock, we read the
3912 * superblock to initialise info and check validity.
3913 * Otherwise, only checking done is that in bind_rdev_to_array,
3914 * which mainly checks size.
3917 int major = simple_strtoul(buf, &e, 10);
3920 struct md_rdev *rdev;
3923 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
3925 minor = simple_strtoul(e+1, &e, 10);
3926 if (*e && *e != '\n')
3928 dev = MKDEV(major, minor);
3929 if (major != MAJOR(dev) ||
3930 minor != MINOR(dev))
3933 flush_workqueue(md_misc_wq);
3935 err = mddev_lock(mddev);
3938 if (mddev->persistent) {
3939 rdev = md_import_device(dev, mddev->major_version,
3940 mddev->minor_version);
3941 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
3942 struct md_rdev *rdev0
3943 = list_entry(mddev->disks.next,
3944 struct md_rdev, same_set);
3945 err = super_types[mddev->major_version]
3946 .load_super(rdev, rdev0, mddev->minor_version);
3950 } else if (mddev->external)
3951 rdev = md_import_device(dev, -2, -1);
3953 rdev = md_import_device(dev, -1, -1);
3956 return PTR_ERR(rdev);
3957 err = bind_rdev_to_array(rdev, mddev);
3961 mddev_unlock(mddev);
3962 return err ? err : len;
3965 static struct md_sysfs_entry md_new_device =
3966 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
3969 bitmap_store(struct mddev *mddev, const char *buf, size_t len)
3972 unsigned long chunk, end_chunk;
3975 err = mddev_lock(mddev);
3980 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
3982 chunk = end_chunk = simple_strtoul(buf, &end, 0);
3983 if (buf == end) break;
3984 if (*end == '-') { /* range */
3986 end_chunk = simple_strtoul(buf, &end, 0);
3987 if (buf == end) break;
3989 if (*end && !isspace(*end)) break;
3990 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
3991 buf = skip_spaces(end);
3993 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
3995 mddev_unlock(mddev);
3999 static struct md_sysfs_entry md_bitmap =
4000 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
4003 size_show(struct mddev *mddev, char *page)
4005 return sprintf(page, "%llu\n",
4006 (unsigned long long)mddev->dev_sectors / 2);
4009 static int update_size(struct mddev *mddev, sector_t num_sectors);
4012 size_store(struct mddev *mddev, const char *buf, size_t len)
4014 /* If array is inactive, we can reduce the component size, but
4015 * not increase it (except from 0).
4016 * If array is active, we can try an on-line resize
4019 int err = strict_blocks_to_sectors(buf, §ors);
4023 err = mddev_lock(mddev);
4027 if (mddev_is_clustered(mddev))
4028 md_cluster_ops->metadata_update_start(mddev);
4029 err = update_size(mddev, sectors);
4030 md_update_sb(mddev, 1);
4031 if (mddev_is_clustered(mddev))
4032 md_cluster_ops->metadata_update_finish(mddev);
4034 if (mddev->dev_sectors == 0 ||
4035 mddev->dev_sectors > sectors)
4036 mddev->dev_sectors = sectors;
4040 mddev_unlock(mddev);
4041 return err ? err : len;
4044 static struct md_sysfs_entry md_size =
4045 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
4047 /* Metadata version.
4049 * 'none' for arrays with no metadata (good luck...)
4050 * 'external' for arrays with externally managed metadata,
4051 * or N.M for internally known formats
4054 metadata_show(struct mddev *mddev, char *page)
4056 if (mddev->persistent)
4057 return sprintf(page, "%d.%d\n",
4058 mddev->major_version, mddev->minor_version);
4059 else if (mddev->external)
4060 return sprintf(page, "external:%s\n", mddev->metadata_type);
4062 return sprintf(page, "none\n");
4066 metadata_store(struct mddev *mddev, const char *buf, size_t len)
4071 /* Changing the details of 'external' metadata is
4072 * always permitted. Otherwise there must be
4073 * no devices attached to the array.
4076 err = mddev_lock(mddev);
4080 if (mddev->external && strncmp(buf, "external:", 9) == 0)
4082 else if (!list_empty(&mddev->disks))
4086 if (cmd_match(buf, "none")) {
4087 mddev->persistent = 0;
4088 mddev->external = 0;
4089 mddev->major_version = 0;
4090 mddev->minor_version = 90;
4093 if (strncmp(buf, "external:", 9) == 0) {
4094 size_t namelen = len-9;
4095 if (namelen >= sizeof(mddev->metadata_type))
4096 namelen = sizeof(mddev->metadata_type)-1;
4097 strncpy(mddev->metadata_type, buf+9, namelen);
4098 mddev->metadata_type[namelen] = 0;
4099 if (namelen && mddev->metadata_type[namelen-1] == '\n')
4100 mddev->metadata_type[--namelen] = 0;
4101 mddev->persistent = 0;
4102 mddev->external = 1;
4103 mddev->major_version = 0;
4104 mddev->minor_version = 90;
4107 major = simple_strtoul(buf, &e, 10);
4109 if (e==buf || *e != '.')
4112 minor = simple_strtoul(buf, &e, 10);
4113 if (e==buf || (*e && *e != '\n') )
4116 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
4118 mddev->major_version = major;
4119 mddev->minor_version = minor;
4120 mddev->persistent = 1;
4121 mddev->external = 0;
4124 mddev_unlock(mddev);
4128 static struct md_sysfs_entry md_metadata =
4129 __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
4132 action_show(struct mddev *mddev, char *page)
4134 char *type = "idle";
4135 unsigned long recovery = mddev->recovery;
4136 if (test_bit(MD_RECOVERY_FROZEN, &recovery))
4138 else if (test_bit(MD_RECOVERY_RUNNING, &recovery) ||
4139 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &recovery))) {
4140 if (test_bit(MD_RECOVERY_RESHAPE, &recovery))
4142 else if (test_bit(MD_RECOVERY_SYNC, &recovery)) {
4143 if (!test_bit(MD_RECOVERY_REQUESTED, &recovery))
4145 else if (test_bit(MD_RECOVERY_CHECK, &recovery))
4149 } else if (test_bit(MD_RECOVERY_RECOVER, &recovery))
4152 return sprintf(page, "%s\n", type);
4156 action_store(struct mddev *mddev, const char *page, size_t len)
4158 if (!mddev->pers || !mddev->pers->sync_request)
4161 if (cmd_match(page, "frozen"))
4162 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4164 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4166 if (cmd_match(page, "idle") || cmd_match(page, "frozen")) {
4167 flush_workqueue(md_misc_wq);
4168 if (mddev->sync_thread) {
4169 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4170 if (mddev_lock(mddev) == 0) {
4171 md_reap_sync_thread(mddev);
4172 mddev_unlock(mddev);
4175 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
4176 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
4178 else if (cmd_match(page, "resync"))
4179 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4180 else if (cmd_match(page, "recover")) {
4181 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
4182 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4183 } else if (cmd_match(page, "reshape")) {
4185 if (mddev->pers->start_reshape == NULL)
4187 err = mddev_lock(mddev);
4189 err = mddev->pers->start_reshape(mddev);
4190 mddev_unlock(mddev);
4194 sysfs_notify(&mddev->kobj, NULL, "degraded");
4196 if (cmd_match(page, "check"))
4197 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
4198 else if (!cmd_match(page, "repair"))
4200 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
4201 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
4203 if (mddev->ro == 2) {
4204 /* A write to sync_action is enough to justify
4205 * canceling read-auto mode
4208 md_wakeup_thread(mddev->sync_thread);
4210 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4211 md_wakeup_thread(mddev->thread);
4212 sysfs_notify_dirent_safe(mddev->sysfs_action);
4216 static struct md_sysfs_entry md_scan_mode =
4217 __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
4220 last_sync_action_show(struct mddev *mddev, char *page)
4222 return sprintf(page, "%s\n", mddev->last_sync_action);
4225 static struct md_sysfs_entry md_last_scan_mode = __ATTR_RO(last_sync_action);
4228 mismatch_cnt_show(struct mddev *mddev, char *page)
4230 return sprintf(page, "%llu\n",
4231 (unsigned long long)
4232 atomic64_read(&mddev->resync_mismatches));
4235 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
4238 sync_min_show(struct mddev *mddev, char *page)
4240 return sprintf(page, "%d (%s)\n", speed_min(mddev),
4241 mddev->sync_speed_min ? "local": "system");
4245 sync_min_store(struct mddev *mddev, const char *buf, size_t len)
4249 if (strncmp(buf, "system", 6)==0) {
4250 mddev->sync_speed_min = 0;
4253 min = simple_strtoul(buf, &e, 10);
4254 if (buf == e || (*e && *e != '\n') || min <= 0)
4256 mddev->sync_speed_min = min;
4260 static struct md_sysfs_entry md_sync_min =
4261 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
4264 sync_max_show(struct mddev *mddev, char *page)
4266 return sprintf(page, "%d (%s)\n", speed_max(mddev),
4267 mddev->sync_speed_max ? "local": "system");
4271 sync_max_store(struct mddev *mddev, const char *buf, size_t len)
4275 if (strncmp(buf, "system", 6)==0) {
4276 mddev->sync_speed_max = 0;
4279 max = simple_strtoul(buf, &e, 10);
4280 if (buf == e || (*e && *e != '\n') || max <= 0)
4282 mddev->sync_speed_max = max;
4286 static struct md_sysfs_entry md_sync_max =
4287 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
4290 degraded_show(struct mddev *mddev, char *page)
4292 return sprintf(page, "%d\n", mddev->degraded);
4294 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
4297 sync_force_parallel_show(struct mddev *mddev, char *page)
4299 return sprintf(page, "%d\n", mddev->parallel_resync);
4303 sync_force_parallel_store(struct mddev *mddev, const char *buf, size_t len)
4307 if (kstrtol(buf, 10, &n))
4310 if (n != 0 && n != 1)
4313 mddev->parallel_resync = n;
4315 if (mddev->sync_thread)
4316 wake_up(&resync_wait);
4321 /* force parallel resync, even with shared block devices */
4322 static struct md_sysfs_entry md_sync_force_parallel =
4323 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
4324 sync_force_parallel_show, sync_force_parallel_store);
4327 sync_speed_show(struct mddev *mddev, char *page)
4329 unsigned long resync, dt, db;
4330 if (mddev->curr_resync == 0)
4331 return sprintf(page, "none\n");
4332 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
4333 dt = (jiffies - mddev->resync_mark) / HZ;
4335 db = resync - mddev->resync_mark_cnt;
4336 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
4339 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
4342 sync_completed_show(struct mddev *mddev, char *page)
4344 unsigned long long max_sectors, resync;
4346 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4347 return sprintf(page, "none\n");
4349 if (mddev->curr_resync == 1 ||
4350 mddev->curr_resync == 2)
4351 return sprintf(page, "delayed\n");
4353 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
4354 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
4355 max_sectors = mddev->resync_max_sectors;
4357 max_sectors = mddev->dev_sectors;
4359 resync = mddev->curr_resync_completed;
4360 return sprintf(page, "%llu / %llu\n", resync, max_sectors);
4363 static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed);
4366 min_sync_show(struct mddev *mddev, char *page)
4368 return sprintf(page, "%llu\n",
4369 (unsigned long long)mddev->resync_min);
4372 min_sync_store(struct mddev *mddev, const char *buf, size_t len)
4374 unsigned long long min;
4378 if (kstrtoull(buf, 10, &min))
4381 spin_lock(&mddev->lock);
4383 if (min > mddev->resync_max)
4387 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4390 /* Must be a multiple of chunk_size */
4391 chunk = mddev->chunk_sectors;
4393 sector_t temp = min;
4396 if (sector_div(temp, chunk))
4399 mddev->resync_min = min;
4403 spin_unlock(&mddev->lock);
4407 static struct md_sysfs_entry md_min_sync =
4408 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
4411 max_sync_show(struct mddev *mddev, char *page)
4413 if (mddev->resync_max == MaxSector)
4414 return sprintf(page, "max\n");
4416 return sprintf(page, "%llu\n",
4417 (unsigned long long)mddev->resync_max);
4420 max_sync_store(struct mddev *mddev, const char *buf, size_t len)
4423 spin_lock(&mddev->lock);
4424 if (strncmp(buf, "max", 3) == 0)
4425 mddev->resync_max = MaxSector;
4427 unsigned long long max;
4431 if (kstrtoull(buf, 10, &max))
4433 if (max < mddev->resync_min)
4437 if (max < mddev->resync_max &&
4439 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4442 /* Must be a multiple of chunk_size */
4443 chunk = mddev->chunk_sectors;
4445 sector_t temp = max;
4448 if (sector_div(temp, chunk))
4451 mddev->resync_max = max;
4453 wake_up(&mddev->recovery_wait);
4456 spin_unlock(&mddev->lock);
4460 static struct md_sysfs_entry md_max_sync =
4461 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
4464 suspend_lo_show(struct mddev *mddev, char *page)
4466 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
4470 suspend_lo_store(struct mddev *mddev, const char *buf, size_t len)
4473 unsigned long long new = simple_strtoull(buf, &e, 10);
4474 unsigned long long old;
4477 if (buf == e || (*e && *e != '\n'))
4480 err = mddev_lock(mddev);
4484 if (mddev->pers == NULL ||
4485 mddev->pers->quiesce == NULL)
4487 old = mddev->suspend_lo;
4488 mddev->suspend_lo = new;
4490 /* Shrinking suspended region */
4491 mddev->pers->quiesce(mddev, 2);
4493 /* Expanding suspended region - need to wait */
4494 mddev->pers->quiesce(mddev, 1);
4495 mddev->pers->quiesce(mddev, 0);
4499 mddev_unlock(mddev);
4502 static struct md_sysfs_entry md_suspend_lo =
4503 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
4506 suspend_hi_show(struct mddev *mddev, char *page)
4508 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
4512 suspend_hi_store(struct mddev *mddev, const char *buf, size_t len)
4515 unsigned long long new = simple_strtoull(buf, &e, 10);
4516 unsigned long long old;
4519 if (buf == e || (*e && *e != '\n'))
4522 err = mddev_lock(mddev);
4526 if (mddev->pers == NULL ||
4527 mddev->pers->quiesce == NULL)
4529 old = mddev->suspend_hi;
4530 mddev->suspend_hi = new;
4532 /* Shrinking suspended region */
4533 mddev->pers->quiesce(mddev, 2);
4535 /* Expanding suspended region - need to wait */
4536 mddev->pers->quiesce(mddev, 1);
4537 mddev->pers->quiesce(mddev, 0);
4541 mddev_unlock(mddev);
4544 static struct md_sysfs_entry md_suspend_hi =
4545 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
4548 reshape_position_show(struct mddev *mddev, char *page)
4550 if (mddev->reshape_position != MaxSector)
4551 return sprintf(page, "%llu\n",
4552 (unsigned long long)mddev->reshape_position);
4553 strcpy(page, "none\n");
4558 reshape_position_store(struct mddev *mddev, const char *buf, size_t len)
4560 struct md_rdev *rdev;
4563 unsigned long long new = simple_strtoull(buf, &e, 10);
4565 if (buf == e || (*e && *e != '\n'))
4567 err = mddev_lock(mddev);
4573 mddev->reshape_position = new;
4574 mddev->delta_disks = 0;
4575 mddev->reshape_backwards = 0;
4576 mddev->new_level = mddev->level;
4577 mddev->new_layout = mddev->layout;
4578 mddev->new_chunk_sectors = mddev->chunk_sectors;
4579 rdev_for_each(rdev, mddev)
4580 rdev->new_data_offset = rdev->data_offset;
4583 mddev_unlock(mddev);
4587 static struct md_sysfs_entry md_reshape_position =
4588 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
4589 reshape_position_store);
4592 reshape_direction_show(struct mddev *mddev, char *page)
4594 return sprintf(page, "%s\n",
4595 mddev->reshape_backwards ? "backwards" : "forwards");
4599 reshape_direction_store(struct mddev *mddev, const char *buf, size_t len)
4604 if (cmd_match(buf, "forwards"))
4606 else if (cmd_match(buf, "backwards"))
4610 if (mddev->reshape_backwards == backwards)
4613 err = mddev_lock(mddev);
4616 /* check if we are allowed to change */
4617 if (mddev->delta_disks)
4619 else if (mddev->persistent &&
4620 mddev->major_version == 0)
4623 mddev->reshape_backwards = backwards;
4624 mddev_unlock(mddev);
4628 static struct md_sysfs_entry md_reshape_direction =
4629 __ATTR(reshape_direction, S_IRUGO|S_IWUSR, reshape_direction_show,
4630 reshape_direction_store);
4633 array_size_show(struct mddev *mddev, char *page)
4635 if (mddev->external_size)
4636 return sprintf(page, "%llu\n",
4637 (unsigned long long)mddev->array_sectors/2);
4639 return sprintf(page, "default\n");
4643 array_size_store(struct mddev *mddev, const char *buf, size_t len)
4648 err = mddev_lock(mddev);
4652 if (strncmp(buf, "default", 7) == 0) {
4654 sectors = mddev->pers->size(mddev, 0, 0);
4656 sectors = mddev->array_sectors;
4658 mddev->external_size = 0;
4660 if (strict_blocks_to_sectors(buf, §ors) < 0)
4662 else if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors)
4665 mddev->external_size = 1;
4669 mddev->array_sectors = sectors;
4671 set_capacity(mddev->gendisk, mddev->array_sectors);
4672 revalidate_disk(mddev->gendisk);
4675 mddev_unlock(mddev);
4679 static struct md_sysfs_entry md_array_size =
4680 __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show,
4683 static struct attribute *md_default_attrs[] = {
4686 &md_raid_disks.attr,
4687 &md_chunk_size.attr,
4689 &md_resync_start.attr,
4691 &md_new_device.attr,
4692 &md_safe_delay.attr,
4693 &md_array_state.attr,
4694 &md_reshape_position.attr,
4695 &md_reshape_direction.attr,
4696 &md_array_size.attr,
4697 &max_corr_read_errors.attr,
4701 static struct attribute *md_redundancy_attrs[] = {
4703 &md_last_scan_mode.attr,
4704 &md_mismatches.attr,
4707 &md_sync_speed.attr,
4708 &md_sync_force_parallel.attr,
4709 &md_sync_completed.attr,
4712 &md_suspend_lo.attr,
4713 &md_suspend_hi.attr,
4718 static struct attribute_group md_redundancy_group = {
4720 .attrs = md_redundancy_attrs,
4724 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
4726 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
4727 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
4732 spin_lock(&all_mddevs_lock);
4733 if (list_empty(&mddev->all_mddevs)) {
4734 spin_unlock(&all_mddevs_lock);
4738 spin_unlock(&all_mddevs_lock);
4740 rv = entry->show(mddev, page);
4746 md_attr_store(struct kobject *kobj, struct attribute *attr,
4747 const char *page, size_t length)
4749 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
4750 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
4755 if (!capable(CAP_SYS_ADMIN))
4757 spin_lock(&all_mddevs_lock);
4758 if (list_empty(&mddev->all_mddevs)) {
4759 spin_unlock(&all_mddevs_lock);
4763 spin_unlock(&all_mddevs_lock);
4764 rv = entry->store(mddev, page, length);
4769 static void md_free(struct kobject *ko)
4771 struct mddev *mddev = container_of(ko, struct mddev, kobj);
4773 if (mddev->sysfs_state)
4774 sysfs_put(mddev->sysfs_state);
4776 if (mddev->gendisk) {
4777 del_gendisk(mddev->gendisk);
4778 put_disk(mddev->gendisk);
4781 blk_cleanup_queue(mddev->queue);
4786 static const struct sysfs_ops md_sysfs_ops = {
4787 .show = md_attr_show,
4788 .store = md_attr_store,
4790 static struct kobj_type md_ktype = {
4792 .sysfs_ops = &md_sysfs_ops,
4793 .default_attrs = md_default_attrs,
4798 static void mddev_delayed_delete(struct work_struct *ws)
4800 struct mddev *mddev = container_of(ws, struct mddev, del_work);
4802 sysfs_remove_group(&mddev->kobj, &md_bitmap_group);
4803 kobject_del(&mddev->kobj);
4804 kobject_put(&mddev->kobj);
4807 static int md_alloc(dev_t dev, char *name)
4809 static DEFINE_MUTEX(disks_mutex);
4810 struct mddev *mddev = mddev_find(dev);
4811 struct gendisk *disk;
4820 partitioned = (MAJOR(mddev->unit) != MD_MAJOR);
4821 shift = partitioned ? MdpMinorShift : 0;
4822 unit = MINOR(mddev->unit) >> shift;
4824 /* wait for any previous instance of this device to be
4825 * completely removed (mddev_delayed_delete).
4827 flush_workqueue(md_misc_wq);
4829 mutex_lock(&disks_mutex);
4835 /* Need to ensure that 'name' is not a duplicate.
4837 struct mddev *mddev2;
4838 spin_lock(&all_mddevs_lock);
4840 list_for_each_entry(mddev2, &all_mddevs, all_mddevs)
4841 if (mddev2->gendisk &&
4842 strcmp(mddev2->gendisk->disk_name, name) == 0) {
4843 spin_unlock(&all_mddevs_lock);
4846 spin_unlock(&all_mddevs_lock);
4850 mddev->queue = blk_alloc_queue(GFP_KERNEL);
4853 mddev->queue->queuedata = mddev;
4855 blk_queue_make_request(mddev->queue, md_make_request);
4856 blk_set_stacking_limits(&mddev->queue->limits);
4858 disk = alloc_disk(1 << shift);
4860 blk_cleanup_queue(mddev->queue);
4861 mddev->queue = NULL;
4864 disk->major = MAJOR(mddev->unit);
4865 disk->first_minor = unit << shift;
4867 strcpy(disk->disk_name, name);
4868 else if (partitioned)
4869 sprintf(disk->disk_name, "md_d%d", unit);
4871 sprintf(disk->disk_name, "md%d", unit);
4872 disk->fops = &md_fops;
4873 disk->private_data = mddev;
4874 disk->queue = mddev->queue;
4875 blk_queue_flush(mddev->queue, REQ_FLUSH | REQ_FUA);
4876 /* Allow extended partitions. This makes the
4877 * 'mdp' device redundant, but we can't really
4880 disk->flags |= GENHD_FL_EXT_DEVT;
4881 mddev->gendisk = disk;
4882 /* As soon as we call add_disk(), another thread could get
4883 * through to md_open, so make sure it doesn't get too far
4885 mutex_lock(&mddev->open_mutex);
4888 error = kobject_init_and_add(&mddev->kobj, &md_ktype,
4889 &disk_to_dev(disk)->kobj, "%s", "md");
4891 /* This isn't possible, but as kobject_init_and_add is marked
4892 * __must_check, we must do something with the result
4894 printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
4898 if (mddev->kobj.sd &&
4899 sysfs_create_group(&mddev->kobj, &md_bitmap_group))
4900 printk(KERN_DEBUG "pointless warning\n");
4901 mutex_unlock(&mddev->open_mutex);
4903 mutex_unlock(&disks_mutex);
4904 if (!error && mddev->kobj.sd) {
4905 kobject_uevent(&mddev->kobj, KOBJ_ADD);
4906 mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state");
4912 static struct kobject *md_probe(dev_t dev, int *part, void *data)
4914 md_alloc(dev, NULL);
4918 static int add_named_array(const char *val, struct kernel_param *kp)
4920 /* val must be "md_*" where * is not all digits.
4921 * We allocate an array with a large free minor number, and
4922 * set the name to val. val must not already be an active name.
4924 int len = strlen(val);
4925 char buf[DISK_NAME_LEN];
4927 while (len && val[len-1] == '\n')
4929 if (len >= DISK_NAME_LEN)
4931 strlcpy(buf, val, len+1);
4932 if (strncmp(buf, "md_", 3) != 0)
4934 return md_alloc(0, buf);
4937 static void md_safemode_timeout(unsigned long data)
4939 struct mddev *mddev = (struct mddev *) data;
4941 if (!atomic_read(&mddev->writes_pending)) {
4942 mddev->safemode = 1;
4943 if (mddev->external)
4944 sysfs_notify_dirent_safe(mddev->sysfs_state);
4946 md_wakeup_thread(mddev->thread);
4949 static int start_dirty_degraded;
4951 int md_run(struct mddev *mddev)
4954 struct md_rdev *rdev;
4955 struct md_personality *pers;
4957 if (list_empty(&mddev->disks))
4958 /* cannot run an array with no devices.. */
4963 /* Cannot run until previous stop completes properly */
4964 if (mddev->sysfs_active)
4968 * Analyze all RAID superblock(s)
4970 if (!mddev->raid_disks) {
4971 if (!mddev->persistent)
4976 if (mddev->level != LEVEL_NONE)
4977 request_module("md-level-%d", mddev->level);
4978 else if (mddev->clevel[0])
4979 request_module("md-%s", mddev->clevel);
4982 * Drop all container device buffers, from now on
4983 * the only valid external interface is through the md
4986 rdev_for_each(rdev, mddev) {
4987 if (test_bit(Faulty, &rdev->flags))
4989 sync_blockdev(rdev->bdev);
4990 invalidate_bdev(rdev->bdev);
4992 /* perform some consistency tests on the device.
4993 * We don't want the data to overlap the metadata,
4994 * Internal Bitmap issues have been handled elsewhere.
4996 if (rdev->meta_bdev) {
4997 /* Nothing to check */;
4998 } else if (rdev->data_offset < rdev->sb_start) {
4999 if (mddev->dev_sectors &&
5000 rdev->data_offset + mddev->dev_sectors
5002 printk("md: %s: data overlaps metadata\n",
5007 if (rdev->sb_start + rdev->sb_size/512
5008 > rdev->data_offset) {
5009 printk("md: %s: metadata overlaps data\n",
5014 sysfs_notify_dirent_safe(rdev->sysfs_state);
5017 if (mddev->bio_set == NULL)
5018 mddev->bio_set = bioset_create(BIO_POOL_SIZE, 0);
5020 spin_lock(&pers_lock);
5021 pers = find_pers(mddev->level, mddev->clevel);
5022 if (!pers || !try_module_get(pers->owner)) {
5023 spin_unlock(&pers_lock);
5024 if (mddev->level != LEVEL_NONE)
5025 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
5028 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
5032 spin_unlock(&pers_lock);
5033 if (mddev->level != pers->level) {
5034 mddev->level = pers->level;
5035 mddev->new_level = pers->level;
5037 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
5039 if (mddev->reshape_position != MaxSector &&
5040 pers->start_reshape == NULL) {
5041 /* This personality cannot handle reshaping... */
5042 module_put(pers->owner);
5046 if (pers->sync_request) {
5047 /* Warn if this is a potentially silly
5050 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
5051 struct md_rdev *rdev2;
5054 rdev_for_each(rdev, mddev)
5055 rdev_for_each(rdev2, mddev) {
5057 rdev->bdev->bd_contains ==
5058 rdev2->bdev->bd_contains) {
5060 "%s: WARNING: %s appears to be"
5061 " on the same physical disk as"
5064 bdevname(rdev->bdev,b),
5065 bdevname(rdev2->bdev,b2));
5072 "True protection against single-disk"
5073 " failure might be compromised.\n");
5076 mddev->recovery = 0;
5077 /* may be over-ridden by personality */
5078 mddev->resync_max_sectors = mddev->dev_sectors;
5080 mddev->ok_start_degraded = start_dirty_degraded;
5082 if (start_readonly && mddev->ro == 0)
5083 mddev->ro = 2; /* read-only, but switch on first write */
5085 err = pers->run(mddev);
5087 printk(KERN_ERR "md: pers->run() failed ...\n");
5088 else if (pers->size(mddev, 0, 0) < mddev->array_sectors) {
5089 WARN_ONCE(!mddev->external_size, "%s: default size too small,"
5090 " but 'external_size' not in effect?\n", __func__);
5092 "md: invalid array_size %llu > default size %llu\n",
5093 (unsigned long long)mddev->array_sectors / 2,
5094 (unsigned long long)pers->size(mddev, 0, 0) / 2);
5097 if (err == 0 && pers->sync_request &&
5098 (mddev->bitmap_info.file || mddev->bitmap_info.offset)) {
5099 struct bitmap *bitmap;
5101 bitmap = bitmap_create(mddev, -1);
5102 if (IS_ERR(bitmap)) {
5103 err = PTR_ERR(bitmap);
5104 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
5105 mdname(mddev), err);
5107 mddev->bitmap = bitmap;
5111 mddev_detach(mddev);
5112 pers->free(mddev, mddev->private);
5113 module_put(pers->owner);
5114 bitmap_destroy(mddev);
5118 mddev->queue->backing_dev_info.congested_data = mddev;
5119 mddev->queue->backing_dev_info.congested_fn = md_congested;
5120 blk_queue_merge_bvec(mddev->queue, md_mergeable_bvec);
5122 if (pers->sync_request) {
5123 if (mddev->kobj.sd &&
5124 sysfs_create_group(&mddev->kobj, &md_redundancy_group))
5126 "md: cannot register extra attributes for %s\n",
5128 mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action");
5129 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
5132 atomic_set(&mddev->writes_pending,0);
5133 atomic_set(&mddev->max_corr_read_errors,
5134 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS);
5135 mddev->safemode = 0;
5136 mddev->safemode_timer.function = md_safemode_timeout;
5137 mddev->safemode_timer.data = (unsigned long) mddev;
5138 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
5141 spin_lock(&mddev->lock);
5144 spin_unlock(&mddev->lock);
5145 rdev_for_each(rdev, mddev)
5146 if (rdev->raid_disk >= 0)
5147 if (sysfs_link_rdev(mddev, rdev))
5148 /* failure here is OK */;
5150 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5152 if (mddev->flags & MD_UPDATE_SB_FLAGS)
5153 md_update_sb(mddev, 0);
5155 md_new_event(mddev);
5156 sysfs_notify_dirent_safe(mddev->sysfs_state);
5157 sysfs_notify_dirent_safe(mddev->sysfs_action);
5158 sysfs_notify(&mddev->kobj, NULL, "degraded");
5161 EXPORT_SYMBOL_GPL(md_run);
5163 static int do_md_run(struct mddev *mddev)
5167 err = md_run(mddev);
5170 err = bitmap_load(mddev);
5172 bitmap_destroy(mddev);
5176 md_wakeup_thread(mddev->thread);
5177 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
5179 set_capacity(mddev->gendisk, mddev->array_sectors);
5180 revalidate_disk(mddev->gendisk);
5182 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
5187 static int restart_array(struct mddev *mddev)
5189 struct gendisk *disk = mddev->gendisk;
5191 /* Complain if it has no devices */
5192 if (list_empty(&mddev->disks))
5198 mddev->safemode = 0;
5200 set_disk_ro(disk, 0);
5201 printk(KERN_INFO "md: %s switched to read-write mode.\n",
5203 /* Kick recovery or resync if necessary */
5204 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5205 md_wakeup_thread(mddev->thread);
5206 md_wakeup_thread(mddev->sync_thread);
5207 sysfs_notify_dirent_safe(mddev->sysfs_state);
5211 static void md_clean(struct mddev *mddev)
5213 mddev->array_sectors = 0;
5214 mddev->external_size = 0;
5215 mddev->dev_sectors = 0;
5216 mddev->raid_disks = 0;
5217 mddev->recovery_cp = 0;
5218 mddev->resync_min = 0;
5219 mddev->resync_max = MaxSector;
5220 mddev->reshape_position = MaxSector;
5221 mddev->external = 0;
5222 mddev->persistent = 0;
5223 mddev->level = LEVEL_NONE;
5224 mddev->clevel[0] = 0;
5227 mddev->metadata_type[0] = 0;
5228 mddev->chunk_sectors = 0;
5229 mddev->ctime = mddev->utime = 0;
5231 mddev->max_disks = 0;
5233 mddev->can_decrease_events = 0;
5234 mddev->delta_disks = 0;
5235 mddev->reshape_backwards = 0;
5236 mddev->new_level = LEVEL_NONE;
5237 mddev->new_layout = 0;
5238 mddev->new_chunk_sectors = 0;
5239 mddev->curr_resync = 0;
5240 atomic64_set(&mddev->resync_mismatches, 0);
5241 mddev->suspend_lo = mddev->suspend_hi = 0;
5242 mddev->sync_speed_min = mddev->sync_speed_max = 0;
5243 mddev->recovery = 0;
5246 mddev->degraded = 0;
5247 mddev->safemode = 0;
5248 mddev->merge_check_needed = 0;
5249 mddev->bitmap_info.offset = 0;
5250 mddev->bitmap_info.default_offset = 0;
5251 mddev->bitmap_info.default_space = 0;
5252 mddev->bitmap_info.chunksize = 0;
5253 mddev->bitmap_info.daemon_sleep = 0;
5254 mddev->bitmap_info.max_write_behind = 0;
5257 static void __md_stop_writes(struct mddev *mddev)
5259 if (mddev_is_clustered(mddev))
5260 md_cluster_ops->metadata_update_start(mddev);
5261 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5262 flush_workqueue(md_misc_wq);
5263 if (mddev->sync_thread) {
5264 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5265 md_reap_sync_thread(mddev);
5268 del_timer_sync(&mddev->safemode_timer);
5270 bitmap_flush(mddev);
5271 md_super_wait(mddev);
5273 if (mddev->ro == 0 &&
5274 (!mddev->in_sync || (mddev->flags & MD_UPDATE_SB_FLAGS))) {
5275 /* mark array as shutdown cleanly */
5277 md_update_sb(mddev, 1);
5279 if (mddev_is_clustered(mddev))
5280 md_cluster_ops->metadata_update_finish(mddev);
5283 void md_stop_writes(struct mddev *mddev)
5285 mddev_lock_nointr(mddev);
5286 __md_stop_writes(mddev);
5287 mddev_unlock(mddev);
5289 EXPORT_SYMBOL_GPL(md_stop_writes);
5291 static void mddev_detach(struct mddev *mddev)
5293 struct bitmap *bitmap = mddev->bitmap;
5294 /* wait for behind writes to complete */
5295 if (bitmap && atomic_read(&bitmap->behind_writes) > 0) {
5296 printk(KERN_INFO "md:%s: behind writes in progress - waiting to stop.\n",
5298 /* need to kick something here to make sure I/O goes? */
5299 wait_event(bitmap->behind_wait,
5300 atomic_read(&bitmap->behind_writes) == 0);
5302 if (mddev->pers && mddev->pers->quiesce) {
5303 mddev->pers->quiesce(mddev, 1);
5304 mddev->pers->quiesce(mddev, 0);
5306 md_unregister_thread(&mddev->thread);
5308 blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/
5311 static void __md_stop(struct mddev *mddev)
5313 struct md_personality *pers = mddev->pers;
5314 mddev_detach(mddev);
5315 spin_lock(&mddev->lock);
5318 spin_unlock(&mddev->lock);
5319 pers->free(mddev, mddev->private);
5320 if (pers->sync_request && mddev->to_remove == NULL)
5321 mddev->to_remove = &md_redundancy_group;
5322 module_put(pers->owner);
5323 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5326 void md_stop(struct mddev *mddev)
5328 /* stop the array and free an attached data structures.
5329 * This is called from dm-raid
5332 bitmap_destroy(mddev);
5334 bioset_free(mddev->bio_set);
5337 EXPORT_SYMBOL_GPL(md_stop);
5339 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev)
5344 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
5346 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5347 md_wakeup_thread(mddev->thread);
5349 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5350 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5351 if (mddev->sync_thread)
5352 /* Thread might be blocked waiting for metadata update
5353 * which will now never happen */
5354 wake_up_process(mddev->sync_thread->tsk);
5356 mddev_unlock(mddev);
5357 wait_event(resync_wait, !test_bit(MD_RECOVERY_RUNNING,
5359 mddev_lock_nointr(mddev);
5361 mutex_lock(&mddev->open_mutex);
5362 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
5363 mddev->sync_thread ||
5364 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
5365 (bdev && !test_bit(MD_STILL_CLOSED, &mddev->flags))) {
5366 printk("md: %s still in use.\n",mdname(mddev));
5368 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5369 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5370 md_wakeup_thread(mddev->thread);
5376 __md_stop_writes(mddev);
5382 set_disk_ro(mddev->gendisk, 1);
5383 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5384 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5385 md_wakeup_thread(mddev->thread);
5386 sysfs_notify_dirent_safe(mddev->sysfs_state);
5390 mutex_unlock(&mddev->open_mutex);
5395 * 0 - completely stop and dis-assemble array
5396 * 2 - stop but do not disassemble array
5398 static int do_md_stop(struct mddev *mddev, int mode,
5399 struct block_device *bdev)
5401 struct gendisk *disk = mddev->gendisk;
5402 struct md_rdev *rdev;
5405 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
5407 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5408 md_wakeup_thread(mddev->thread);
5410 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5411 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5412 if (mddev->sync_thread)
5413 /* Thread might be blocked waiting for metadata update
5414 * which will now never happen */
5415 wake_up_process(mddev->sync_thread->tsk);
5417 mddev_unlock(mddev);
5418 wait_event(resync_wait, (mddev->sync_thread == NULL &&
5419 !test_bit(MD_RECOVERY_RUNNING,
5420 &mddev->recovery)));
5421 mddev_lock_nointr(mddev);
5423 mutex_lock(&mddev->open_mutex);
5424 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
5425 mddev->sysfs_active ||
5426 mddev->sync_thread ||
5427 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
5428 (bdev && !test_bit(MD_STILL_CLOSED, &mddev->flags))) {
5429 printk("md: %s still in use.\n",mdname(mddev));
5430 mutex_unlock(&mddev->open_mutex);
5432 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5433 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5434 md_wakeup_thread(mddev->thread);
5440 set_disk_ro(disk, 0);
5442 __md_stop_writes(mddev);
5444 mddev->queue->merge_bvec_fn = NULL;
5445 mddev->queue->backing_dev_info.congested_fn = NULL;
5447 /* tell userspace to handle 'inactive' */
5448 sysfs_notify_dirent_safe(mddev->sysfs_state);
5450 rdev_for_each(rdev, mddev)
5451 if (rdev->raid_disk >= 0)
5452 sysfs_unlink_rdev(mddev, rdev);
5454 set_capacity(disk, 0);
5455 mutex_unlock(&mddev->open_mutex);
5457 revalidate_disk(disk);
5462 mutex_unlock(&mddev->open_mutex);
5464 * Free resources if final stop
5467 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
5469 bitmap_destroy(mddev);
5470 if (mddev->bitmap_info.file) {
5471 struct file *f = mddev->bitmap_info.file;
5472 spin_lock(&mddev->lock);
5473 mddev->bitmap_info.file = NULL;
5474 spin_unlock(&mddev->lock);
5477 mddev->bitmap_info.offset = 0;
5479 export_array(mddev);
5482 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
5483 if (mddev->hold_active == UNTIL_STOP)
5484 mddev->hold_active = 0;
5486 blk_integrity_unregister(disk);
5487 md_new_event(mddev);
5488 sysfs_notify_dirent_safe(mddev->sysfs_state);
5493 static void autorun_array(struct mddev *mddev)
5495 struct md_rdev *rdev;
5498 if (list_empty(&mddev->disks))
5501 printk(KERN_INFO "md: running: ");
5503 rdev_for_each(rdev, mddev) {
5504 char b[BDEVNAME_SIZE];
5505 printk("<%s>", bdevname(rdev->bdev,b));
5509 err = do_md_run(mddev);
5511 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
5512 do_md_stop(mddev, 0, NULL);
5517 * lets try to run arrays based on all disks that have arrived
5518 * until now. (those are in pending_raid_disks)
5520 * the method: pick the first pending disk, collect all disks with
5521 * the same UUID, remove all from the pending list and put them into
5522 * the 'same_array' list. Then order this list based on superblock
5523 * update time (freshest comes first), kick out 'old' disks and
5524 * compare superblocks. If everything's fine then run it.
5526 * If "unit" is allocated, then bump its reference count
5528 static void autorun_devices(int part)
5530 struct md_rdev *rdev0, *rdev, *tmp;
5531 struct mddev *mddev;
5532 char b[BDEVNAME_SIZE];
5534 printk(KERN_INFO "md: autorun ...\n");
5535 while (!list_empty(&pending_raid_disks)) {
5538 LIST_HEAD(candidates);
5539 rdev0 = list_entry(pending_raid_disks.next,
5540 struct md_rdev, same_set);
5542 printk(KERN_INFO "md: considering %s ...\n",
5543 bdevname(rdev0->bdev,b));
5544 INIT_LIST_HEAD(&candidates);
5545 rdev_for_each_list(rdev, tmp, &pending_raid_disks)
5546 if (super_90_load(rdev, rdev0, 0) >= 0) {
5547 printk(KERN_INFO "md: adding %s ...\n",
5548 bdevname(rdev->bdev,b));
5549 list_move(&rdev->same_set, &candidates);
5552 * now we have a set of devices, with all of them having
5553 * mostly sane superblocks. It's time to allocate the
5557 dev = MKDEV(mdp_major,
5558 rdev0->preferred_minor << MdpMinorShift);
5559 unit = MINOR(dev) >> MdpMinorShift;
5561 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
5564 if (rdev0->preferred_minor != unit) {
5565 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
5566 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
5570 md_probe(dev, NULL, NULL);
5571 mddev = mddev_find(dev);
5572 if (!mddev || !mddev->gendisk) {
5576 "md: cannot allocate memory for md drive.\n");
5579 if (mddev_lock(mddev))
5580 printk(KERN_WARNING "md: %s locked, cannot run\n",
5582 else if (mddev->raid_disks || mddev->major_version
5583 || !list_empty(&mddev->disks)) {
5585 "md: %s already running, cannot run %s\n",
5586 mdname(mddev), bdevname(rdev0->bdev,b));
5587 mddev_unlock(mddev);
5589 printk(KERN_INFO "md: created %s\n", mdname(mddev));
5590 mddev->persistent = 1;
5591 rdev_for_each_list(rdev, tmp, &candidates) {
5592 list_del_init(&rdev->same_set);
5593 if (bind_rdev_to_array(rdev, mddev))
5596 autorun_array(mddev);
5597 mddev_unlock(mddev);
5599 /* on success, candidates will be empty, on error
5602 rdev_for_each_list(rdev, tmp, &candidates) {
5603 list_del_init(&rdev->same_set);
5608 printk(KERN_INFO "md: ... autorun DONE.\n");
5610 #endif /* !MODULE */
5612 static int get_version(void __user *arg)
5616 ver.major = MD_MAJOR_VERSION;
5617 ver.minor = MD_MINOR_VERSION;
5618 ver.patchlevel = MD_PATCHLEVEL_VERSION;
5620 if (copy_to_user(arg, &ver, sizeof(ver)))
5626 static int get_array_info(struct mddev *mddev, void __user *arg)
5628 mdu_array_info_t info;
5629 int nr,working,insync,failed,spare;
5630 struct md_rdev *rdev;
5632 nr = working = insync = failed = spare = 0;
5634 rdev_for_each_rcu(rdev, mddev) {
5636 if (test_bit(Faulty, &rdev->flags))
5640 if (test_bit(In_sync, &rdev->flags))
5648 info.major_version = mddev->major_version;
5649 info.minor_version = mddev->minor_version;
5650 info.patch_version = MD_PATCHLEVEL_VERSION;
5651 info.ctime = mddev->ctime;
5652 info.level = mddev->level;
5653 info.size = mddev->dev_sectors / 2;
5654 if (info.size != mddev->dev_sectors / 2) /* overflow */
5657 info.raid_disks = mddev->raid_disks;
5658 info.md_minor = mddev->md_minor;
5659 info.not_persistent= !mddev->persistent;
5661 info.utime = mddev->utime;
5664 info.state = (1<<MD_SB_CLEAN);
5665 if (mddev->bitmap && mddev->bitmap_info.offset)
5666 info.state |= (1<<MD_SB_BITMAP_PRESENT);
5667 if (mddev_is_clustered(mddev))
5668 info.state |= (1<<MD_SB_CLUSTERED);
5669 info.active_disks = insync;
5670 info.working_disks = working;
5671 info.failed_disks = failed;
5672 info.spare_disks = spare;
5674 info.layout = mddev->layout;
5675 info.chunk_size = mddev->chunk_sectors << 9;
5677 if (copy_to_user(arg, &info, sizeof(info)))
5683 static int get_bitmap_file(struct mddev *mddev, void __user * arg)
5685 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
5689 file = kmalloc(sizeof(*file), GFP_NOIO);
5694 spin_lock(&mddev->lock);
5695 /* bitmap disabled, zero the first byte and copy out */
5696 if (!mddev->bitmap_info.file)
5697 file->pathname[0] = '\0';
5698 else if ((ptr = d_path(&mddev->bitmap_info.file->f_path,
5699 file->pathname, sizeof(file->pathname))),
5703 memmove(file->pathname, ptr,
5704 sizeof(file->pathname)-(ptr-file->pathname));
5705 spin_unlock(&mddev->lock);
5708 copy_to_user(arg, file, sizeof(*file)))
5715 static int get_disk_info(struct mddev *mddev, void __user * arg)
5717 mdu_disk_info_t info;
5718 struct md_rdev *rdev;
5720 if (copy_from_user(&info, arg, sizeof(info)))
5724 rdev = find_rdev_nr_rcu(mddev, info.number);
5726 info.major = MAJOR(rdev->bdev->bd_dev);
5727 info.minor = MINOR(rdev->bdev->bd_dev);
5728 info.raid_disk = rdev->raid_disk;
5730 if (test_bit(Faulty, &rdev->flags))
5731 info.state |= (1<<MD_DISK_FAULTY);
5732 else if (test_bit(In_sync, &rdev->flags)) {
5733 info.state |= (1<<MD_DISK_ACTIVE);
5734 info.state |= (1<<MD_DISK_SYNC);
5736 if (test_bit(WriteMostly, &rdev->flags))
5737 info.state |= (1<<MD_DISK_WRITEMOSTLY);
5739 info.major = info.minor = 0;
5740 info.raid_disk = -1;
5741 info.state = (1<<MD_DISK_REMOVED);
5745 if (copy_to_user(arg, &info, sizeof(info)))
5751 static int add_new_disk(struct mddev *mddev, mdu_disk_info_t *info)
5753 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
5754 struct md_rdev *rdev;
5755 dev_t dev = MKDEV(info->major,info->minor);
5757 if (mddev_is_clustered(mddev) &&
5758 !(info->state & ((1 << MD_DISK_CLUSTER_ADD) | (1 << MD_DISK_CANDIDATE)))) {
5759 pr_err("%s: Cannot add to clustered mddev.\n",
5764 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
5767 if (!mddev->raid_disks) {
5769 /* expecting a device which has a superblock */
5770 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
5773 "md: md_import_device returned %ld\n",
5775 return PTR_ERR(rdev);
5777 if (!list_empty(&mddev->disks)) {
5778 struct md_rdev *rdev0
5779 = list_entry(mddev->disks.next,
5780 struct md_rdev, same_set);
5781 err = super_types[mddev->major_version]
5782 .load_super(rdev, rdev0, mddev->minor_version);
5785 "md: %s has different UUID to %s\n",
5786 bdevname(rdev->bdev,b),
5787 bdevname(rdev0->bdev,b2));
5792 err = bind_rdev_to_array(rdev, mddev);
5799 * add_new_disk can be used once the array is assembled
5800 * to add "hot spares". They must already have a superblock
5805 if (!mddev->pers->hot_add_disk) {
5807 "%s: personality does not support diskops!\n",
5811 if (mddev->persistent)
5812 rdev = md_import_device(dev, mddev->major_version,
5813 mddev->minor_version);
5815 rdev = md_import_device(dev, -1, -1);
5818 "md: md_import_device returned %ld\n",
5820 return PTR_ERR(rdev);
5822 /* set saved_raid_disk if appropriate */
5823 if (!mddev->persistent) {
5824 if (info->state & (1<<MD_DISK_SYNC) &&
5825 info->raid_disk < mddev->raid_disks) {
5826 rdev->raid_disk = info->raid_disk;
5827 set_bit(In_sync, &rdev->flags);
5828 clear_bit(Bitmap_sync, &rdev->flags);
5830 rdev->raid_disk = -1;
5831 rdev->saved_raid_disk = rdev->raid_disk;
5833 super_types[mddev->major_version].
5834 validate_super(mddev, rdev);
5835 if ((info->state & (1<<MD_DISK_SYNC)) &&
5836 rdev->raid_disk != info->raid_disk) {
5837 /* This was a hot-add request, but events doesn't
5838 * match, so reject it.
5844 clear_bit(In_sync, &rdev->flags); /* just to be sure */
5845 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
5846 set_bit(WriteMostly, &rdev->flags);
5848 clear_bit(WriteMostly, &rdev->flags);
5851 * check whether the device shows up in other nodes
5853 if (mddev_is_clustered(mddev)) {
5854 if (info->state & (1 << MD_DISK_CANDIDATE)) {
5855 /* Through --cluster-confirm */
5856 set_bit(Candidate, &rdev->flags);
5857 err = md_cluster_ops->new_disk_ack(mddev, true);
5862 } else if (info->state & (1 << MD_DISK_CLUSTER_ADD)) {
5863 /* --add initiated by this node */
5864 err = md_cluster_ops->add_new_disk_start(mddev, rdev);
5866 md_cluster_ops->add_new_disk_finish(mddev);
5873 rdev->raid_disk = -1;
5874 err = bind_rdev_to_array(rdev, mddev);
5875 if (!err && !mddev->pers->hot_remove_disk) {
5876 /* If there is hot_add_disk but no hot_remove_disk
5877 * then added disks for geometry changes,
5878 * and should be added immediately.
5880 super_types[mddev->major_version].
5881 validate_super(mddev, rdev);
5882 err = mddev->pers->hot_add_disk(mddev, rdev);
5884 unbind_rdev_from_array(rdev);
5889 sysfs_notify_dirent_safe(rdev->sysfs_state);
5891 set_bit(MD_CHANGE_DEVS, &mddev->flags);
5892 if (mddev->degraded)
5893 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
5894 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5896 md_new_event(mddev);
5897 md_wakeup_thread(mddev->thread);
5898 if (mddev_is_clustered(mddev) &&
5899 (info->state & (1 << MD_DISK_CLUSTER_ADD)))
5900 md_cluster_ops->add_new_disk_finish(mddev);
5904 /* otherwise, add_new_disk is only allowed
5905 * for major_version==0 superblocks
5907 if (mddev->major_version != 0) {
5908 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
5913 if (!(info->state & (1<<MD_DISK_FAULTY))) {
5915 rdev = md_import_device(dev, -1, 0);
5918 "md: error, md_import_device() returned %ld\n",
5920 return PTR_ERR(rdev);
5922 rdev->desc_nr = info->number;
5923 if (info->raid_disk < mddev->raid_disks)
5924 rdev->raid_disk = info->raid_disk;
5926 rdev->raid_disk = -1;
5928 if (rdev->raid_disk < mddev->raid_disks)
5929 if (info->state & (1<<MD_DISK_SYNC))
5930 set_bit(In_sync, &rdev->flags);
5932 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
5933 set_bit(WriteMostly, &rdev->flags);
5935 if (!mddev->persistent) {
5936 printk(KERN_INFO "md: nonpersistent superblock ...\n");
5937 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
5939 rdev->sb_start = calc_dev_sboffset(rdev);
5940 rdev->sectors = rdev->sb_start;
5942 err = bind_rdev_to_array(rdev, mddev);
5952 static int hot_remove_disk(struct mddev *mddev, dev_t dev)
5954 char b[BDEVNAME_SIZE];
5955 struct md_rdev *rdev;
5957 rdev = find_rdev(mddev, dev);
5961 if (mddev_is_clustered(mddev))
5962 md_cluster_ops->metadata_update_start(mddev);
5964 clear_bit(Blocked, &rdev->flags);
5965 remove_and_add_spares(mddev, rdev);
5967 if (rdev->raid_disk >= 0)
5970 md_kick_rdev_from_array(rdev);
5971 md_update_sb(mddev, 1);
5972 md_new_event(mddev);
5974 if (mddev_is_clustered(mddev))
5975 md_cluster_ops->metadata_update_finish(mddev);
5979 if (mddev_is_clustered(mddev))
5980 md_cluster_ops->metadata_update_cancel(mddev);
5981 printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n",
5982 bdevname(rdev->bdev,b), mdname(mddev));
5986 static int hot_add_disk(struct mddev *mddev, dev_t dev)
5988 char b[BDEVNAME_SIZE];
5990 struct md_rdev *rdev;
5995 if (mddev->major_version != 0) {
5996 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
5997 " version-0 superblocks.\n",
6001 if (!mddev->pers->hot_add_disk) {
6003 "%s: personality does not support diskops!\n",
6008 rdev = md_import_device(dev, -1, 0);
6011 "md: error, md_import_device() returned %ld\n",
6016 if (mddev->persistent)
6017 rdev->sb_start = calc_dev_sboffset(rdev);
6019 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
6021 rdev->sectors = rdev->sb_start;
6023 if (test_bit(Faulty, &rdev->flags)) {
6025 "md: can not hot-add faulty %s disk to %s!\n",
6026 bdevname(rdev->bdev,b), mdname(mddev));
6031 if (mddev_is_clustered(mddev))
6032 md_cluster_ops->metadata_update_start(mddev);
6033 clear_bit(In_sync, &rdev->flags);
6035 rdev->saved_raid_disk = -1;
6036 err = bind_rdev_to_array(rdev, mddev);
6038 goto abort_clustered;
6041 * The rest should better be atomic, we can have disk failures
6042 * noticed in interrupt contexts ...
6045 rdev->raid_disk = -1;
6047 md_update_sb(mddev, 1);
6049 if (mddev_is_clustered(mddev))
6050 md_cluster_ops->metadata_update_finish(mddev);
6052 * Kick recovery, maybe this spare has to be added to the
6053 * array immediately.
6055 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6056 md_wakeup_thread(mddev->thread);
6057 md_new_event(mddev);
6061 if (mddev_is_clustered(mddev))
6062 md_cluster_ops->metadata_update_cancel(mddev);
6068 static int set_bitmap_file(struct mddev *mddev, int fd)
6073 if (!mddev->pers->quiesce || !mddev->thread)
6075 if (mddev->recovery || mddev->sync_thread)
6077 /* we should be able to change the bitmap.. */
6081 struct inode *inode;
6084 if (mddev->bitmap || mddev->bitmap_info.file)
6085 return -EEXIST; /* cannot add when bitmap is present */
6089 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
6094 inode = f->f_mapping->host;
6095 if (!S_ISREG(inode->i_mode)) {
6096 printk(KERN_ERR "%s: error: bitmap file must be a regular file\n",
6099 } else if (!(f->f_mode & FMODE_WRITE)) {
6100 printk(KERN_ERR "%s: error: bitmap file must open for write\n",
6103 } else if (atomic_read(&inode->i_writecount) != 1) {
6104 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
6112 mddev->bitmap_info.file = f;
6113 mddev->bitmap_info.offset = 0; /* file overrides offset */
6114 } else if (mddev->bitmap == NULL)
6115 return -ENOENT; /* cannot remove what isn't there */
6118 mddev->pers->quiesce(mddev, 1);
6120 struct bitmap *bitmap;
6122 bitmap = bitmap_create(mddev, -1);
6123 if (!IS_ERR(bitmap)) {
6124 mddev->bitmap = bitmap;
6125 err = bitmap_load(mddev);
6127 err = PTR_ERR(bitmap);
6129 if (fd < 0 || err) {
6130 bitmap_destroy(mddev);
6131 fd = -1; /* make sure to put the file */
6133 mddev->pers->quiesce(mddev, 0);
6136 struct file *f = mddev->bitmap_info.file;
6138 spin_lock(&mddev->lock);
6139 mddev->bitmap_info.file = NULL;
6140 spin_unlock(&mddev->lock);
6149 * set_array_info is used two different ways
6150 * The original usage is when creating a new array.
6151 * In this usage, raid_disks is > 0 and it together with
6152 * level, size, not_persistent,layout,chunksize determine the
6153 * shape of the array.
6154 * This will always create an array with a type-0.90.0 superblock.
6155 * The newer usage is when assembling an array.
6156 * In this case raid_disks will be 0, and the major_version field is
6157 * use to determine which style super-blocks are to be found on the devices.
6158 * The minor and patch _version numbers are also kept incase the
6159 * super_block handler wishes to interpret them.
6161 static int set_array_info(struct mddev *mddev, mdu_array_info_t *info)
6164 if (info->raid_disks == 0) {
6165 /* just setting version number for superblock loading */
6166 if (info->major_version < 0 ||
6167 info->major_version >= ARRAY_SIZE(super_types) ||
6168 super_types[info->major_version].name == NULL) {
6169 /* maybe try to auto-load a module? */
6171 "md: superblock version %d not known\n",
6172 info->major_version);
6175 mddev->major_version = info->major_version;
6176 mddev->minor_version = info->minor_version;
6177 mddev->patch_version = info->patch_version;
6178 mddev->persistent = !info->not_persistent;
6179 /* ensure mddev_put doesn't delete this now that there
6180 * is some minimal configuration.
6182 mddev->ctime = get_seconds();
6185 mddev->major_version = MD_MAJOR_VERSION;
6186 mddev->minor_version = MD_MINOR_VERSION;
6187 mddev->patch_version = MD_PATCHLEVEL_VERSION;
6188 mddev->ctime = get_seconds();
6190 mddev->level = info->level;
6191 mddev->clevel[0] = 0;
6192 mddev->dev_sectors = 2 * (sector_t)info->size;
6193 mddev->raid_disks = info->raid_disks;
6194 /* don't set md_minor, it is determined by which /dev/md* was
6197 if (info->state & (1<<MD_SB_CLEAN))
6198 mddev->recovery_cp = MaxSector;
6200 mddev->recovery_cp = 0;
6201 mddev->persistent = ! info->not_persistent;
6202 mddev->external = 0;
6204 mddev->layout = info->layout;
6205 mddev->chunk_sectors = info->chunk_size >> 9;
6207 mddev->max_disks = MD_SB_DISKS;
6209 if (mddev->persistent)
6211 set_bit(MD_CHANGE_DEVS, &mddev->flags);
6213 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
6214 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
6215 mddev->bitmap_info.offset = 0;
6217 mddev->reshape_position = MaxSector;
6220 * Generate a 128 bit UUID
6222 get_random_bytes(mddev->uuid, 16);
6224 mddev->new_level = mddev->level;
6225 mddev->new_chunk_sectors = mddev->chunk_sectors;
6226 mddev->new_layout = mddev->layout;
6227 mddev->delta_disks = 0;
6228 mddev->reshape_backwards = 0;
6233 void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors)
6235 WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__);
6237 if (mddev->external_size)
6240 mddev->array_sectors = array_sectors;
6242 EXPORT_SYMBOL(md_set_array_sectors);
6244 static int update_size(struct mddev *mddev, sector_t num_sectors)
6246 struct md_rdev *rdev;
6248 int fit = (num_sectors == 0);
6250 if (mddev->pers->resize == NULL)
6252 /* The "num_sectors" is the number of sectors of each device that
6253 * is used. This can only make sense for arrays with redundancy.
6254 * linear and raid0 always use whatever space is available. We can only
6255 * consider changing this number if no resync or reconstruction is
6256 * happening, and if the new size is acceptable. It must fit before the
6257 * sb_start or, if that is <data_offset, it must fit before the size
6258 * of each device. If num_sectors is zero, we find the largest size
6261 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
6267 rdev_for_each(rdev, mddev) {
6268 sector_t avail = rdev->sectors;
6270 if (fit && (num_sectors == 0 || num_sectors > avail))
6271 num_sectors = avail;
6272 if (avail < num_sectors)
6275 rv = mddev->pers->resize(mddev, num_sectors);
6277 revalidate_disk(mddev->gendisk);
6281 static int update_raid_disks(struct mddev *mddev, int raid_disks)
6284 struct md_rdev *rdev;
6285 /* change the number of raid disks */
6286 if (mddev->pers->check_reshape == NULL)
6290 if (raid_disks <= 0 ||
6291 (mddev->max_disks && raid_disks >= mddev->max_disks))
6293 if (mddev->sync_thread ||
6294 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
6295 mddev->reshape_position != MaxSector)
6298 rdev_for_each(rdev, mddev) {
6299 if (mddev->raid_disks < raid_disks &&
6300 rdev->data_offset < rdev->new_data_offset)
6302 if (mddev->raid_disks > raid_disks &&
6303 rdev->data_offset > rdev->new_data_offset)
6307 mddev->delta_disks = raid_disks - mddev->raid_disks;
6308 if (mddev->delta_disks < 0)
6309 mddev->reshape_backwards = 1;
6310 else if (mddev->delta_disks > 0)
6311 mddev->reshape_backwards = 0;
6313 rv = mddev->pers->check_reshape(mddev);
6315 mddev->delta_disks = 0;
6316 mddev->reshape_backwards = 0;
6322 * update_array_info is used to change the configuration of an
6324 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
6325 * fields in the info are checked against the array.
6326 * Any differences that cannot be handled will cause an error.
6327 * Normally, only one change can be managed at a time.
6329 static int update_array_info(struct mddev *mddev, mdu_array_info_t *info)
6335 /* calculate expected state,ignoring low bits */
6336 if (mddev->bitmap && mddev->bitmap_info.offset)
6337 state |= (1 << MD_SB_BITMAP_PRESENT);
6339 if (mddev->major_version != info->major_version ||
6340 mddev->minor_version != info->minor_version ||
6341 /* mddev->patch_version != info->patch_version || */
6342 mddev->ctime != info->ctime ||
6343 mddev->level != info->level ||
6344 /* mddev->layout != info->layout || */
6345 !mddev->persistent != info->not_persistent||
6346 mddev->chunk_sectors != info->chunk_size >> 9 ||
6347 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
6348 ((state^info->state) & 0xfffffe00)
6351 /* Check there is only one change */
6352 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
6354 if (mddev->raid_disks != info->raid_disks)
6356 if (mddev->layout != info->layout)
6358 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT))
6365 if (mddev->layout != info->layout) {
6367 * we don't need to do anything at the md level, the
6368 * personality will take care of it all.
6370 if (mddev->pers->check_reshape == NULL)
6373 mddev->new_layout = info->layout;
6374 rv = mddev->pers->check_reshape(mddev);
6376 mddev->new_layout = mddev->layout;
6380 if (mddev_is_clustered(mddev))
6381 md_cluster_ops->metadata_update_start(mddev);
6382 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
6383 rv = update_size(mddev, (sector_t)info->size * 2);
6385 if (mddev->raid_disks != info->raid_disks)
6386 rv = update_raid_disks(mddev, info->raid_disks);
6388 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
6389 if (mddev->pers->quiesce == NULL || mddev->thread == NULL) {
6393 if (mddev->recovery || mddev->sync_thread) {
6397 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
6398 struct bitmap *bitmap;
6399 /* add the bitmap */
6400 if (mddev->bitmap) {
6404 if (mddev->bitmap_info.default_offset == 0) {
6408 mddev->bitmap_info.offset =
6409 mddev->bitmap_info.default_offset;
6410 mddev->bitmap_info.space =
6411 mddev->bitmap_info.default_space;
6412 mddev->pers->quiesce(mddev, 1);
6413 bitmap = bitmap_create(mddev, -1);
6414 if (!IS_ERR(bitmap)) {
6415 mddev->bitmap = bitmap;
6416 rv = bitmap_load(mddev);
6418 rv = PTR_ERR(bitmap);
6420 bitmap_destroy(mddev);
6421 mddev->pers->quiesce(mddev, 0);
6423 /* remove the bitmap */
6424 if (!mddev->bitmap) {
6428 if (mddev->bitmap->storage.file) {
6432 mddev->pers->quiesce(mddev, 1);
6433 bitmap_destroy(mddev);
6434 mddev->pers->quiesce(mddev, 0);
6435 mddev->bitmap_info.offset = 0;
6438 md_update_sb(mddev, 1);
6439 if (mddev_is_clustered(mddev))
6440 md_cluster_ops->metadata_update_finish(mddev);
6443 if (mddev_is_clustered(mddev))
6444 md_cluster_ops->metadata_update_cancel(mddev);
6448 static int set_disk_faulty(struct mddev *mddev, dev_t dev)
6450 struct md_rdev *rdev;
6453 if (mddev->pers == NULL)
6457 rdev = find_rdev_rcu(mddev, dev);
6461 md_error(mddev, rdev);
6462 if (!test_bit(Faulty, &rdev->flags))
6470 * We have a problem here : there is no easy way to give a CHS
6471 * virtual geometry. We currently pretend that we have a 2 heads
6472 * 4 sectors (with a BIG number of cylinders...). This drives
6473 * dosfs just mad... ;-)
6475 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
6477 struct mddev *mddev = bdev->bd_disk->private_data;
6481 geo->cylinders = mddev->array_sectors / 8;
6485 static inline bool md_ioctl_valid(unsigned int cmd)
6490 case GET_ARRAY_INFO:
6491 case GET_BITMAP_FILE:
6494 case HOT_REMOVE_DISK:
6497 case RESTART_ARRAY_RW:
6499 case SET_ARRAY_INFO:
6500 case SET_BITMAP_FILE:
6501 case SET_DISK_FAULTY:
6504 case CLUSTERED_DISK_NACK:
6511 static int md_ioctl(struct block_device *bdev, fmode_t mode,
6512 unsigned int cmd, unsigned long arg)
6515 void __user *argp = (void __user *)arg;
6516 struct mddev *mddev = NULL;
6519 if (!md_ioctl_valid(cmd))
6524 case GET_ARRAY_INFO:
6528 if (!capable(CAP_SYS_ADMIN))
6533 * Commands dealing with the RAID driver but not any
6538 err = get_version(argp);
6544 autostart_arrays(arg);
6551 * Commands creating/starting a new array:
6554 mddev = bdev->bd_disk->private_data;
6561 /* Some actions do not requires the mutex */
6563 case GET_ARRAY_INFO:
6564 if (!mddev->raid_disks && !mddev->external)
6567 err = get_array_info(mddev, argp);
6571 if (!mddev->raid_disks && !mddev->external)
6574 err = get_disk_info(mddev, argp);
6577 case SET_DISK_FAULTY:
6578 err = set_disk_faulty(mddev, new_decode_dev(arg));
6581 case GET_BITMAP_FILE:
6582 err = get_bitmap_file(mddev, argp);
6587 if (cmd == ADD_NEW_DISK)
6588 /* need to ensure md_delayed_delete() has completed */
6589 flush_workqueue(md_misc_wq);
6591 if (cmd == HOT_REMOVE_DISK)
6592 /* need to ensure recovery thread has run */
6593 wait_event_interruptible_timeout(mddev->sb_wait,
6594 !test_bit(MD_RECOVERY_NEEDED,
6596 msecs_to_jiffies(5000));
6597 if (cmd == STOP_ARRAY || cmd == STOP_ARRAY_RO) {
6598 /* Need to flush page cache, and ensure no-one else opens
6601 mutex_lock(&mddev->open_mutex);
6602 if (mddev->pers && atomic_read(&mddev->openers) > 1) {
6603 mutex_unlock(&mddev->open_mutex);
6607 set_bit(MD_STILL_CLOSED, &mddev->flags);
6608 mutex_unlock(&mddev->open_mutex);
6609 sync_blockdev(bdev);
6611 err = mddev_lock(mddev);
6614 "md: ioctl lock interrupted, reason %d, cmd %d\n",
6619 if (cmd == SET_ARRAY_INFO) {
6620 mdu_array_info_t info;
6622 memset(&info, 0, sizeof(info));
6623 else if (copy_from_user(&info, argp, sizeof(info))) {
6628 err = update_array_info(mddev, &info);
6630 printk(KERN_WARNING "md: couldn't update"
6631 " array info. %d\n", err);
6636 if (!list_empty(&mddev->disks)) {
6638 "md: array %s already has disks!\n",
6643 if (mddev->raid_disks) {
6645 "md: array %s already initialised!\n",
6650 err = set_array_info(mddev, &info);
6652 printk(KERN_WARNING "md: couldn't set"
6653 " array info. %d\n", err);
6660 * Commands querying/configuring an existing array:
6662 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
6663 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
6664 if ((!mddev->raid_disks && !mddev->external)
6665 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
6666 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
6667 && cmd != GET_BITMAP_FILE) {
6673 * Commands even a read-only array can execute:
6676 case RESTART_ARRAY_RW:
6677 err = restart_array(mddev);
6681 err = do_md_stop(mddev, 0, bdev);
6685 err = md_set_readonly(mddev, bdev);
6688 case HOT_REMOVE_DISK:
6689 err = hot_remove_disk(mddev, new_decode_dev(arg));
6693 /* We can support ADD_NEW_DISK on read-only arrays
6694 * on if we are re-adding a preexisting device.
6695 * So require mddev->pers and MD_DISK_SYNC.
6698 mdu_disk_info_t info;
6699 if (copy_from_user(&info, argp, sizeof(info)))
6701 else if (!(info.state & (1<<MD_DISK_SYNC)))
6702 /* Need to clear read-only for this */
6705 err = add_new_disk(mddev, &info);
6711 if (get_user(ro, (int __user *)(arg))) {
6717 /* if the bdev is going readonly the value of mddev->ro
6718 * does not matter, no writes are coming
6723 /* are we are already prepared for writes? */
6727 /* transitioning to readauto need only happen for
6728 * arrays that call md_write_start
6731 err = restart_array(mddev);
6734 set_disk_ro(mddev->gendisk, 0);
6741 * The remaining ioctls are changing the state of the
6742 * superblock, so we do not allow them on read-only arrays.
6744 if (mddev->ro && mddev->pers) {
6745 if (mddev->ro == 2) {
6747 sysfs_notify_dirent_safe(mddev->sysfs_state);
6748 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6749 /* mddev_unlock will wake thread */
6750 /* If a device failed while we were read-only, we
6751 * need to make sure the metadata is updated now.
6753 if (test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
6754 mddev_unlock(mddev);
6755 wait_event(mddev->sb_wait,
6756 !test_bit(MD_CHANGE_DEVS, &mddev->flags) &&
6757 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
6758 mddev_lock_nointr(mddev);
6769 mdu_disk_info_t info;
6770 if (copy_from_user(&info, argp, sizeof(info)))
6773 err = add_new_disk(mddev, &info);
6777 case CLUSTERED_DISK_NACK:
6778 if (mddev_is_clustered(mddev))
6779 md_cluster_ops->new_disk_ack(mddev, false);
6785 err = hot_add_disk(mddev, new_decode_dev(arg));
6789 err = do_md_run(mddev);
6792 case SET_BITMAP_FILE:
6793 err = set_bitmap_file(mddev, (int)arg);
6802 if (mddev->hold_active == UNTIL_IOCTL &&
6804 mddev->hold_active = 0;
6805 mddev_unlock(mddev);
6809 #ifdef CONFIG_COMPAT
6810 static int md_compat_ioctl(struct block_device *bdev, fmode_t mode,
6811 unsigned int cmd, unsigned long arg)
6814 case HOT_REMOVE_DISK:
6816 case SET_DISK_FAULTY:
6817 case SET_BITMAP_FILE:
6818 /* These take in integer arg, do not convert */
6821 arg = (unsigned long)compat_ptr(arg);
6825 return md_ioctl(bdev, mode, cmd, arg);
6827 #endif /* CONFIG_COMPAT */
6829 static int md_open(struct block_device *bdev, fmode_t mode)
6832 * Succeed if we can lock the mddev, which confirms that
6833 * it isn't being stopped right now.
6835 struct mddev *mddev = mddev_find(bdev->bd_dev);
6841 if (mddev->gendisk != bdev->bd_disk) {
6842 /* we are racing with mddev_put which is discarding this
6846 /* Wait until bdev->bd_disk is definitely gone */
6847 flush_workqueue(md_misc_wq);
6848 /* Then retry the open from the top */
6849 return -ERESTARTSYS;
6851 BUG_ON(mddev != bdev->bd_disk->private_data);
6853 if ((err = mutex_lock_interruptible(&mddev->open_mutex)))
6857 atomic_inc(&mddev->openers);
6858 clear_bit(MD_STILL_CLOSED, &mddev->flags);
6859 mutex_unlock(&mddev->open_mutex);
6861 check_disk_change(bdev);
6866 static void md_release(struct gendisk *disk, fmode_t mode)
6868 struct mddev *mddev = disk->private_data;
6871 atomic_dec(&mddev->openers);
6875 static int md_media_changed(struct gendisk *disk)
6877 struct mddev *mddev = disk->private_data;
6879 return mddev->changed;
6882 static int md_revalidate(struct gendisk *disk)
6884 struct mddev *mddev = disk->private_data;
6889 static const struct block_device_operations md_fops =
6891 .owner = THIS_MODULE,
6893 .release = md_release,
6895 #ifdef CONFIG_COMPAT
6896 .compat_ioctl = md_compat_ioctl,
6898 .getgeo = md_getgeo,
6899 .media_changed = md_media_changed,
6900 .revalidate_disk= md_revalidate,
6903 static int md_thread(void *arg)
6905 struct md_thread *thread = arg;
6908 * md_thread is a 'system-thread', it's priority should be very
6909 * high. We avoid resource deadlocks individually in each
6910 * raid personality. (RAID5 does preallocation) We also use RR and
6911 * the very same RT priority as kswapd, thus we will never get
6912 * into a priority inversion deadlock.
6914 * we definitely have to have equal or higher priority than
6915 * bdflush, otherwise bdflush will deadlock if there are too
6916 * many dirty RAID5 blocks.
6919 allow_signal(SIGKILL);
6920 while (!kthread_should_stop()) {
6922 /* We need to wait INTERRUPTIBLE so that
6923 * we don't add to the load-average.
6924 * That means we need to be sure no signals are
6927 if (signal_pending(current))
6928 flush_signals(current);
6930 wait_event_interruptible_timeout
6932 test_bit(THREAD_WAKEUP, &thread->flags)
6933 || kthread_should_stop(),
6936 clear_bit(THREAD_WAKEUP, &thread->flags);
6937 if (!kthread_should_stop())
6938 thread->run(thread);
6944 void md_wakeup_thread(struct md_thread *thread)
6947 pr_debug("md: waking up MD thread %s.\n", thread->tsk->comm);
6948 set_bit(THREAD_WAKEUP, &thread->flags);
6949 wake_up(&thread->wqueue);
6952 EXPORT_SYMBOL(md_wakeup_thread);
6954 struct md_thread *md_register_thread(void (*run) (struct md_thread *),
6955 struct mddev *mddev, const char *name)
6957 struct md_thread *thread;
6959 thread = kzalloc(sizeof(struct md_thread), GFP_KERNEL);
6963 init_waitqueue_head(&thread->wqueue);
6966 thread->mddev = mddev;
6967 thread->timeout = MAX_SCHEDULE_TIMEOUT;
6968 thread->tsk = kthread_run(md_thread, thread,
6970 mdname(thread->mddev),
6972 if (IS_ERR(thread->tsk)) {
6978 EXPORT_SYMBOL(md_register_thread);
6980 void md_unregister_thread(struct md_thread **threadp)
6982 struct md_thread *thread = *threadp;
6985 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
6986 /* Locking ensures that mddev_unlock does not wake_up a
6987 * non-existent thread
6989 spin_lock(&pers_lock);
6991 spin_unlock(&pers_lock);
6993 kthread_stop(thread->tsk);
6996 EXPORT_SYMBOL(md_unregister_thread);
6998 void md_error(struct mddev *mddev, struct md_rdev *rdev)
7000 if (!rdev || test_bit(Faulty, &rdev->flags))
7003 if (!mddev->pers || !mddev->pers->error_handler)
7005 mddev->pers->error_handler(mddev,rdev);
7006 if (mddev->degraded)
7007 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7008 sysfs_notify_dirent_safe(rdev->sysfs_state);
7009 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7010 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7011 md_wakeup_thread(mddev->thread);
7012 if (mddev->event_work.func)
7013 queue_work(md_misc_wq, &mddev->event_work);
7014 md_new_event_inintr(mddev);
7016 EXPORT_SYMBOL(md_error);
7018 /* seq_file implementation /proc/mdstat */
7020 static void status_unused(struct seq_file *seq)
7023 struct md_rdev *rdev;
7025 seq_printf(seq, "unused devices: ");
7027 list_for_each_entry(rdev, &pending_raid_disks, same_set) {
7028 char b[BDEVNAME_SIZE];
7030 seq_printf(seq, "%s ",
7031 bdevname(rdev->bdev,b));
7034 seq_printf(seq, "<none>");
7036 seq_printf(seq, "\n");
7039 static void status_resync(struct seq_file *seq, struct mddev *mddev)
7041 sector_t max_sectors, resync, res;
7042 unsigned long dt, db;
7045 unsigned int per_milli;
7047 if (mddev->curr_resync <= 3)
7050 resync = mddev->curr_resync
7051 - atomic_read(&mddev->recovery_active);
7053 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
7054 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
7055 max_sectors = mddev->resync_max_sectors;
7057 max_sectors = mddev->dev_sectors;
7059 WARN_ON(max_sectors == 0);
7060 /* Pick 'scale' such that (resync>>scale)*1000 will fit
7061 * in a sector_t, and (max_sectors>>scale) will fit in a
7062 * u32, as those are the requirements for sector_div.
7063 * Thus 'scale' must be at least 10
7066 if (sizeof(sector_t) > sizeof(unsigned long)) {
7067 while ( max_sectors/2 > (1ULL<<(scale+32)))
7070 res = (resync>>scale)*1000;
7071 sector_div(res, (u32)((max_sectors>>scale)+1));
7075 int i, x = per_milli/50, y = 20-x;
7076 seq_printf(seq, "[");
7077 for (i = 0; i < x; i++)
7078 seq_printf(seq, "=");
7079 seq_printf(seq, ">");
7080 for (i = 0; i < y; i++)
7081 seq_printf(seq, ".");
7082 seq_printf(seq, "] ");
7084 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
7085 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
7087 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
7089 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
7090 "resync" : "recovery"))),
7091 per_milli/10, per_milli % 10,
7092 (unsigned long long) resync/2,
7093 (unsigned long long) max_sectors/2);
7096 * dt: time from mark until now
7097 * db: blocks written from mark until now
7098 * rt: remaining time
7100 * rt is a sector_t, so could be 32bit or 64bit.
7101 * So we divide before multiply in case it is 32bit and close
7103 * We scale the divisor (db) by 32 to avoid losing precision
7104 * near the end of resync when the number of remaining sectors
7106 * We then divide rt by 32 after multiplying by db to compensate.
7107 * The '+1' avoids division by zero if db is very small.
7109 dt = ((jiffies - mddev->resync_mark) / HZ);
7111 db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active))
7112 - mddev->resync_mark_cnt;
7114 rt = max_sectors - resync; /* number of remaining sectors */
7115 sector_div(rt, db/32+1);
7119 seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60,
7120 ((unsigned long)rt % 60)/6);
7122 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
7125 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
7127 struct list_head *tmp;
7129 struct mddev *mddev;
7137 spin_lock(&all_mddevs_lock);
7138 list_for_each(tmp,&all_mddevs)
7140 mddev = list_entry(tmp, struct mddev, all_mddevs);
7142 spin_unlock(&all_mddevs_lock);
7145 spin_unlock(&all_mddevs_lock);
7147 return (void*)2;/* tail */
7151 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
7153 struct list_head *tmp;
7154 struct mddev *next_mddev, *mddev = v;
7160 spin_lock(&all_mddevs_lock);
7162 tmp = all_mddevs.next;
7164 tmp = mddev->all_mddevs.next;
7165 if (tmp != &all_mddevs)
7166 next_mddev = mddev_get(list_entry(tmp,struct mddev,all_mddevs));
7168 next_mddev = (void*)2;
7171 spin_unlock(&all_mddevs_lock);
7179 static void md_seq_stop(struct seq_file *seq, void *v)
7181 struct mddev *mddev = v;
7183 if (mddev && v != (void*)1 && v != (void*)2)
7187 static int md_seq_show(struct seq_file *seq, void *v)
7189 struct mddev *mddev = v;
7191 struct md_rdev *rdev;
7193 if (v == (void*)1) {
7194 struct md_personality *pers;
7195 seq_printf(seq, "Personalities : ");
7196 spin_lock(&pers_lock);
7197 list_for_each_entry(pers, &pers_list, list)
7198 seq_printf(seq, "[%s] ", pers->name);
7200 spin_unlock(&pers_lock);
7201 seq_printf(seq, "\n");
7202 seq->poll_event = atomic_read(&md_event_count);
7205 if (v == (void*)2) {
7210 spin_lock(&mddev->lock);
7211 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
7212 seq_printf(seq, "%s : %sactive", mdname(mddev),
7213 mddev->pers ? "" : "in");
7216 seq_printf(seq, " (read-only)");
7218 seq_printf(seq, " (auto-read-only)");
7219 seq_printf(seq, " %s", mddev->pers->name);
7224 rdev_for_each_rcu(rdev, mddev) {
7225 char b[BDEVNAME_SIZE];
7226 seq_printf(seq, " %s[%d]",
7227 bdevname(rdev->bdev,b), rdev->desc_nr);
7228 if (test_bit(WriteMostly, &rdev->flags))
7229 seq_printf(seq, "(W)");
7230 if (test_bit(Faulty, &rdev->flags)) {
7231 seq_printf(seq, "(F)");
7234 if (rdev->raid_disk < 0)
7235 seq_printf(seq, "(S)"); /* spare */
7236 if (test_bit(Replacement, &rdev->flags))
7237 seq_printf(seq, "(R)");
7238 sectors += rdev->sectors;
7242 if (!list_empty(&mddev->disks)) {
7244 seq_printf(seq, "\n %llu blocks",
7245 (unsigned long long)
7246 mddev->array_sectors / 2);
7248 seq_printf(seq, "\n %llu blocks",
7249 (unsigned long long)sectors / 2);
7251 if (mddev->persistent) {
7252 if (mddev->major_version != 0 ||
7253 mddev->minor_version != 90) {
7254 seq_printf(seq," super %d.%d",
7255 mddev->major_version,
7256 mddev->minor_version);
7258 } else if (mddev->external)
7259 seq_printf(seq, " super external:%s",
7260 mddev->metadata_type);
7262 seq_printf(seq, " super non-persistent");
7265 mddev->pers->status(seq, mddev);
7266 seq_printf(seq, "\n ");
7267 if (mddev->pers->sync_request) {
7268 if (mddev->curr_resync > 2) {
7269 status_resync(seq, mddev);
7270 seq_printf(seq, "\n ");
7271 } else if (mddev->curr_resync >= 1)
7272 seq_printf(seq, "\tresync=DELAYED\n ");
7273 else if (mddev->recovery_cp < MaxSector)
7274 seq_printf(seq, "\tresync=PENDING\n ");
7277 seq_printf(seq, "\n ");
7279 bitmap_status(seq, mddev->bitmap);
7281 seq_printf(seq, "\n");
7283 spin_unlock(&mddev->lock);
7288 static const struct seq_operations md_seq_ops = {
7289 .start = md_seq_start,
7290 .next = md_seq_next,
7291 .stop = md_seq_stop,
7292 .show = md_seq_show,
7295 static int md_seq_open(struct inode *inode, struct file *file)
7297 struct seq_file *seq;
7300 error = seq_open(file, &md_seq_ops);
7304 seq = file->private_data;
7305 seq->poll_event = atomic_read(&md_event_count);
7309 static int md_unloading;
7310 static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
7312 struct seq_file *seq = filp->private_data;
7316 return POLLIN|POLLRDNORM|POLLERR|POLLPRI;
7317 poll_wait(filp, &md_event_waiters, wait);
7319 /* always allow read */
7320 mask = POLLIN | POLLRDNORM;
7322 if (seq->poll_event != atomic_read(&md_event_count))
7323 mask |= POLLERR | POLLPRI;
7327 static const struct file_operations md_seq_fops = {
7328 .owner = THIS_MODULE,
7329 .open = md_seq_open,
7331 .llseek = seq_lseek,
7332 .release = seq_release_private,
7333 .poll = mdstat_poll,
7336 int register_md_personality(struct md_personality *p)
7338 printk(KERN_INFO "md: %s personality registered for level %d\n",
7340 spin_lock(&pers_lock);
7341 list_add_tail(&p->list, &pers_list);
7342 spin_unlock(&pers_lock);
7345 EXPORT_SYMBOL(register_md_personality);
7347 int unregister_md_personality(struct md_personality *p)
7349 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
7350 spin_lock(&pers_lock);
7351 list_del_init(&p->list);
7352 spin_unlock(&pers_lock);
7355 EXPORT_SYMBOL(unregister_md_personality);
7357 int register_md_cluster_operations(struct md_cluster_operations *ops, struct module *module)
7359 if (md_cluster_ops != NULL)
7361 spin_lock(&pers_lock);
7362 md_cluster_ops = ops;
7363 md_cluster_mod = module;
7364 spin_unlock(&pers_lock);
7367 EXPORT_SYMBOL(register_md_cluster_operations);
7369 int unregister_md_cluster_operations(void)
7371 spin_lock(&pers_lock);
7372 md_cluster_ops = NULL;
7373 spin_unlock(&pers_lock);
7376 EXPORT_SYMBOL(unregister_md_cluster_operations);
7378 int md_setup_cluster(struct mddev *mddev, int nodes)
7382 err = request_module("md-cluster");
7384 pr_err("md-cluster module not found.\n");
7388 spin_lock(&pers_lock);
7389 if (!md_cluster_ops || !try_module_get(md_cluster_mod)) {
7390 spin_unlock(&pers_lock);
7393 spin_unlock(&pers_lock);
7395 return md_cluster_ops->join(mddev, nodes);
7398 void md_cluster_stop(struct mddev *mddev)
7400 if (!md_cluster_ops)
7402 md_cluster_ops->leave(mddev);
7403 module_put(md_cluster_mod);
7406 static int is_mddev_idle(struct mddev *mddev, int init)
7408 struct md_rdev *rdev;
7414 rdev_for_each_rcu(rdev, mddev) {
7415 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
7416 curr_events = (int)part_stat_read(&disk->part0, sectors[0]) +
7417 (int)part_stat_read(&disk->part0, sectors[1]) -
7418 atomic_read(&disk->sync_io);
7419 /* sync IO will cause sync_io to increase before the disk_stats
7420 * as sync_io is counted when a request starts, and
7421 * disk_stats is counted when it completes.
7422 * So resync activity will cause curr_events to be smaller than
7423 * when there was no such activity.
7424 * non-sync IO will cause disk_stat to increase without
7425 * increasing sync_io so curr_events will (eventually)
7426 * be larger than it was before. Once it becomes
7427 * substantially larger, the test below will cause
7428 * the array to appear non-idle, and resync will slow
7430 * If there is a lot of outstanding resync activity when
7431 * we set last_event to curr_events, then all that activity
7432 * completing might cause the array to appear non-idle
7433 * and resync will be slowed down even though there might
7434 * not have been non-resync activity. This will only
7435 * happen once though. 'last_events' will soon reflect
7436 * the state where there is little or no outstanding
7437 * resync requests, and further resync activity will
7438 * always make curr_events less than last_events.
7441 if (init || curr_events - rdev->last_events > 64) {
7442 rdev->last_events = curr_events;
7450 void md_done_sync(struct mddev *mddev, int blocks, int ok)
7452 /* another "blocks" (512byte) blocks have been synced */
7453 atomic_sub(blocks, &mddev->recovery_active);
7454 wake_up(&mddev->recovery_wait);
7456 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7457 set_bit(MD_RECOVERY_ERROR, &mddev->recovery);
7458 md_wakeup_thread(mddev->thread);
7459 // stop recovery, signal do_sync ....
7462 EXPORT_SYMBOL(md_done_sync);
7464 /* md_write_start(mddev, bi)
7465 * If we need to update some array metadata (e.g. 'active' flag
7466 * in superblock) before writing, schedule a superblock update
7467 * and wait for it to complete.
7469 void md_write_start(struct mddev *mddev, struct bio *bi)
7472 if (bio_data_dir(bi) != WRITE)
7475 BUG_ON(mddev->ro == 1);
7476 if (mddev->ro == 2) {
7477 /* need to switch to read/write */
7479 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7480 md_wakeup_thread(mddev->thread);
7481 md_wakeup_thread(mddev->sync_thread);
7484 atomic_inc(&mddev->writes_pending);
7485 if (mddev->safemode == 1)
7486 mddev->safemode = 0;
7487 if (mddev->in_sync) {
7488 spin_lock(&mddev->lock);
7489 if (mddev->in_sync) {
7491 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
7492 set_bit(MD_CHANGE_PENDING, &mddev->flags);
7493 md_wakeup_thread(mddev->thread);
7496 spin_unlock(&mddev->lock);
7499 sysfs_notify_dirent_safe(mddev->sysfs_state);
7500 wait_event(mddev->sb_wait,
7501 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
7503 EXPORT_SYMBOL(md_write_start);
7505 void md_write_end(struct mddev *mddev)
7507 if (atomic_dec_and_test(&mddev->writes_pending)) {
7508 if (mddev->safemode == 2)
7509 md_wakeup_thread(mddev->thread);
7510 else if (mddev->safemode_delay)
7511 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
7514 EXPORT_SYMBOL(md_write_end);
7516 /* md_allow_write(mddev)
7517 * Calling this ensures that the array is marked 'active' so that writes
7518 * may proceed without blocking. It is important to call this before
7519 * attempting a GFP_KERNEL allocation while holding the mddev lock.
7520 * Must be called with mddev_lock held.
7522 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
7523 * is dropped, so return -EAGAIN after notifying userspace.
7525 int md_allow_write(struct mddev *mddev)
7531 if (!mddev->pers->sync_request)
7534 spin_lock(&mddev->lock);
7535 if (mddev->in_sync) {
7537 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
7538 set_bit(MD_CHANGE_PENDING, &mddev->flags);
7539 if (mddev->safemode_delay &&
7540 mddev->safemode == 0)
7541 mddev->safemode = 1;
7542 spin_unlock(&mddev->lock);
7543 if (mddev_is_clustered(mddev))
7544 md_cluster_ops->metadata_update_start(mddev);
7545 md_update_sb(mddev, 0);
7546 if (mddev_is_clustered(mddev))
7547 md_cluster_ops->metadata_update_finish(mddev);
7548 sysfs_notify_dirent_safe(mddev->sysfs_state);
7550 spin_unlock(&mddev->lock);
7552 if (test_bit(MD_CHANGE_PENDING, &mddev->flags))
7557 EXPORT_SYMBOL_GPL(md_allow_write);
7559 #define SYNC_MARKS 10
7560 #define SYNC_MARK_STEP (3*HZ)
7561 #define UPDATE_FREQUENCY (5*60*HZ)
7562 void md_do_sync(struct md_thread *thread)
7564 struct mddev *mddev = thread->mddev;
7565 struct mddev *mddev2;
7566 unsigned int currspeed = 0,
7568 sector_t max_sectors,j, io_sectors, recovery_done;
7569 unsigned long mark[SYNC_MARKS];
7570 unsigned long update_time;
7571 sector_t mark_cnt[SYNC_MARKS];
7573 struct list_head *tmp;
7574 sector_t last_check;
7576 struct md_rdev *rdev;
7577 char *desc, *action = NULL;
7578 struct blk_plug plug;
7580 /* just incase thread restarts... */
7581 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
7583 if (mddev->ro) {/* never try to sync a read-only array */
7584 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7588 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
7589 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) {
7590 desc = "data-check";
7592 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
7593 desc = "requested-resync";
7597 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
7602 mddev->last_sync_action = action ?: desc;
7604 /* we overload curr_resync somewhat here.
7605 * 0 == not engaged in resync at all
7606 * 2 == checking that there is no conflict with another sync
7607 * 1 == like 2, but have yielded to allow conflicting resync to
7609 * other == active in resync - this many blocks
7611 * Before starting a resync we must have set curr_resync to
7612 * 2, and then checked that every "conflicting" array has curr_resync
7613 * less than ours. When we find one that is the same or higher
7614 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
7615 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
7616 * This will mean we have to start checking from the beginning again.
7621 mddev->curr_resync = 2;
7624 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
7626 for_each_mddev(mddev2, tmp) {
7627 if (mddev2 == mddev)
7629 if (!mddev->parallel_resync
7630 && mddev2->curr_resync
7631 && match_mddev_units(mddev, mddev2)) {
7633 if (mddev < mddev2 && mddev->curr_resync == 2) {
7634 /* arbitrarily yield */
7635 mddev->curr_resync = 1;
7636 wake_up(&resync_wait);
7638 if (mddev > mddev2 && mddev->curr_resync == 1)
7639 /* no need to wait here, we can wait the next
7640 * time 'round when curr_resync == 2
7643 /* We need to wait 'interruptible' so as not to
7644 * contribute to the load average, and not to
7645 * be caught by 'softlockup'
7647 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
7648 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
7649 mddev2->curr_resync >= mddev->curr_resync) {
7650 printk(KERN_INFO "md: delaying %s of %s"
7651 " until %s has finished (they"
7652 " share one or more physical units)\n",
7653 desc, mdname(mddev), mdname(mddev2));
7655 if (signal_pending(current))
7656 flush_signals(current);
7658 finish_wait(&resync_wait, &wq);
7661 finish_wait(&resync_wait, &wq);
7664 } while (mddev->curr_resync < 2);
7667 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
7668 /* resync follows the size requested by the personality,
7669 * which defaults to physical size, but can be virtual size
7671 max_sectors = mddev->resync_max_sectors;
7672 atomic64_set(&mddev->resync_mismatches, 0);
7673 /* we don't use the checkpoint if there's a bitmap */
7674 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
7675 j = mddev->resync_min;
7676 else if (!mddev->bitmap)
7677 j = mddev->recovery_cp;
7679 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
7680 max_sectors = mddev->resync_max_sectors;
7682 /* recovery follows the physical size of devices */
7683 max_sectors = mddev->dev_sectors;
7686 rdev_for_each_rcu(rdev, mddev)
7687 if (rdev->raid_disk >= 0 &&
7688 !test_bit(Faulty, &rdev->flags) &&
7689 !test_bit(In_sync, &rdev->flags) &&
7690 rdev->recovery_offset < j)
7691 j = rdev->recovery_offset;
7694 /* If there is a bitmap, we need to make sure all
7695 * writes that started before we added a spare
7696 * complete before we start doing a recovery.
7697 * Otherwise the write might complete and (via
7698 * bitmap_endwrite) set a bit in the bitmap after the
7699 * recovery has checked that bit and skipped that
7702 if (mddev->bitmap) {
7703 mddev->pers->quiesce(mddev, 1);
7704 mddev->pers->quiesce(mddev, 0);
7708 printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev));
7709 printk(KERN_INFO "md: minimum _guaranteed_ speed:"
7710 " %d KB/sec/disk.\n", speed_min(mddev));
7711 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
7712 "(but not more than %d KB/sec) for %s.\n",
7713 speed_max(mddev), desc);
7715 is_mddev_idle(mddev, 1); /* this initializes IO event counters */
7718 for (m = 0; m < SYNC_MARKS; m++) {
7720 mark_cnt[m] = io_sectors;
7723 mddev->resync_mark = mark[last_mark];
7724 mddev->resync_mark_cnt = mark_cnt[last_mark];
7727 * Tune reconstruction:
7729 window = 32*(PAGE_SIZE/512);
7730 printk(KERN_INFO "md: using %dk window, over a total of %lluk.\n",
7731 window/2, (unsigned long long)max_sectors/2);
7733 atomic_set(&mddev->recovery_active, 0);
7738 "md: resuming %s of %s from checkpoint.\n",
7739 desc, mdname(mddev));
7740 mddev->curr_resync = j;
7742 mddev->curr_resync = 3; /* no longer delayed */
7743 mddev->curr_resync_completed = j;
7744 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
7745 md_new_event(mddev);
7746 update_time = jiffies;
7748 if (mddev_is_clustered(mddev))
7749 md_cluster_ops->resync_start(mddev, j, max_sectors);
7751 blk_start_plug(&plug);
7752 while (j < max_sectors) {
7757 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
7758 ((mddev->curr_resync > mddev->curr_resync_completed &&
7759 (mddev->curr_resync - mddev->curr_resync_completed)
7760 > (max_sectors >> 4)) ||
7761 time_after_eq(jiffies, update_time + UPDATE_FREQUENCY) ||
7762 (j - mddev->curr_resync_completed)*2
7763 >= mddev->resync_max - mddev->curr_resync_completed
7765 /* time to update curr_resync_completed */
7766 wait_event(mddev->recovery_wait,
7767 atomic_read(&mddev->recovery_active) == 0);
7768 mddev->curr_resync_completed = j;
7769 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) &&
7770 j > mddev->recovery_cp)
7771 mddev->recovery_cp = j;
7772 update_time = jiffies;
7773 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
7774 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
7777 while (j >= mddev->resync_max &&
7778 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
7779 /* As this condition is controlled by user-space,
7780 * we can block indefinitely, so use '_interruptible'
7781 * to avoid triggering warnings.
7783 flush_signals(current); /* just in case */
7784 wait_event_interruptible(mddev->recovery_wait,
7785 mddev->resync_max > j
7786 || test_bit(MD_RECOVERY_INTR,
7790 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
7793 sectors = mddev->pers->sync_request(mddev, j, &skipped,
7794 currspeed < speed_min(mddev));
7796 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7800 if (!skipped) { /* actual IO requested */
7801 io_sectors += sectors;
7802 atomic_add(sectors, &mddev->recovery_active);
7805 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
7810 mddev->curr_resync = j;
7811 if (mddev_is_clustered(mddev))
7812 md_cluster_ops->resync_info_update(mddev, j, max_sectors);
7813 mddev->curr_mark_cnt = io_sectors;
7814 if (last_check == 0)
7815 /* this is the earliest that rebuild will be
7816 * visible in /proc/mdstat
7818 md_new_event(mddev);
7820 if (last_check + window > io_sectors || j == max_sectors)
7823 last_check = io_sectors;
7825 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
7827 int next = (last_mark+1) % SYNC_MARKS;
7829 mddev->resync_mark = mark[next];
7830 mddev->resync_mark_cnt = mark_cnt[next];
7831 mark[next] = jiffies;
7832 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
7836 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
7840 * this loop exits only if either when we are slower than
7841 * the 'hard' speed limit, or the system was IO-idle for
7843 * the system might be non-idle CPU-wise, but we only care
7844 * about not overloading the IO subsystem. (things like an
7845 * e2fsck being done on the RAID array should execute fast)
7849 recovery_done = io_sectors - atomic_read(&mddev->recovery_active);
7850 currspeed = ((unsigned long)(recovery_done - mddev->resync_mark_cnt))/2
7851 /((jiffies-mddev->resync_mark)/HZ +1) +1;
7853 if (currspeed > speed_min(mddev)) {
7854 if ((currspeed > speed_max(mddev)) ||
7855 !is_mddev_idle(mddev, 0)) {
7861 printk(KERN_INFO "md: %s: %s %s.\n",mdname(mddev), desc,
7862 test_bit(MD_RECOVERY_INTR, &mddev->recovery)
7863 ? "interrupted" : "done");
7865 * this also signals 'finished resyncing' to md_stop
7867 blk_finish_plug(&plug);
7868 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
7870 /* tell personality that we are finished */
7871 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
7873 if (mddev_is_clustered(mddev))
7874 md_cluster_ops->resync_finish(mddev);
7876 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
7877 mddev->curr_resync > 2) {
7878 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
7879 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
7880 if (mddev->curr_resync >= mddev->recovery_cp) {
7882 "md: checkpointing %s of %s.\n",
7883 desc, mdname(mddev));
7884 if (test_bit(MD_RECOVERY_ERROR,
7886 mddev->recovery_cp =
7887 mddev->curr_resync_completed;
7889 mddev->recovery_cp =
7893 mddev->recovery_cp = MaxSector;
7895 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
7896 mddev->curr_resync = MaxSector;
7898 rdev_for_each_rcu(rdev, mddev)
7899 if (rdev->raid_disk >= 0 &&
7900 mddev->delta_disks >= 0 &&
7901 !test_bit(Faulty, &rdev->flags) &&
7902 !test_bit(In_sync, &rdev->flags) &&
7903 rdev->recovery_offset < mddev->curr_resync)
7904 rdev->recovery_offset = mddev->curr_resync;
7909 set_bit(MD_CHANGE_DEVS, &mddev->flags);
7911 spin_lock(&mddev->lock);
7912 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
7913 /* We completed so min/max setting can be forgotten if used. */
7914 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
7915 mddev->resync_min = 0;
7916 mddev->resync_max = MaxSector;
7917 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
7918 mddev->resync_min = mddev->curr_resync_completed;
7919 mddev->curr_resync = 0;
7920 spin_unlock(&mddev->lock);
7922 wake_up(&resync_wait);
7923 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
7924 md_wakeup_thread(mddev->thread);
7927 EXPORT_SYMBOL_GPL(md_do_sync);
7929 static int remove_and_add_spares(struct mddev *mddev,
7930 struct md_rdev *this)
7932 struct md_rdev *rdev;
7936 rdev_for_each(rdev, mddev)
7937 if ((this == NULL || rdev == this) &&
7938 rdev->raid_disk >= 0 &&
7939 !test_bit(Blocked, &rdev->flags) &&
7940 (test_bit(Faulty, &rdev->flags) ||
7941 ! test_bit(In_sync, &rdev->flags)) &&
7942 atomic_read(&rdev->nr_pending)==0) {
7943 if (mddev->pers->hot_remove_disk(
7944 mddev, rdev) == 0) {
7945 sysfs_unlink_rdev(mddev, rdev);
7946 rdev->raid_disk = -1;
7950 if (removed && mddev->kobj.sd)
7951 sysfs_notify(&mddev->kobj, NULL, "degraded");
7956 rdev_for_each(rdev, mddev) {
7957 if (rdev->raid_disk >= 0 &&
7958 !test_bit(In_sync, &rdev->flags) &&
7959 !test_bit(Faulty, &rdev->flags))
7961 if (rdev->raid_disk >= 0)
7963 if (test_bit(Faulty, &rdev->flags))
7966 ! (rdev->saved_raid_disk >= 0 &&
7967 !test_bit(Bitmap_sync, &rdev->flags)))
7970 if (rdev->saved_raid_disk < 0)
7971 rdev->recovery_offset = 0;
7973 hot_add_disk(mddev, rdev) == 0) {
7974 if (sysfs_link_rdev(mddev, rdev))
7975 /* failure here is OK */;
7977 md_new_event(mddev);
7978 set_bit(MD_CHANGE_DEVS, &mddev->flags);
7983 set_bit(MD_CHANGE_DEVS, &mddev->flags);
7987 static void md_start_sync(struct work_struct *ws)
7989 struct mddev *mddev = container_of(ws, struct mddev, del_work);
7991 mddev->sync_thread = md_register_thread(md_do_sync,
7994 if (!mddev->sync_thread) {
7995 printk(KERN_ERR "%s: could not start resync"
7998 /* leave the spares where they are, it shouldn't hurt */
7999 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8000 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
8001 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
8002 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
8003 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
8004 wake_up(&resync_wait);
8005 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
8007 if (mddev->sysfs_action)
8008 sysfs_notify_dirent_safe(mddev->sysfs_action);
8010 md_wakeup_thread(mddev->sync_thread);
8011 sysfs_notify_dirent_safe(mddev->sysfs_action);
8012 md_new_event(mddev);
8016 * This routine is regularly called by all per-raid-array threads to
8017 * deal with generic issues like resync and super-block update.
8018 * Raid personalities that don't have a thread (linear/raid0) do not
8019 * need this as they never do any recovery or update the superblock.
8021 * It does not do any resync itself, but rather "forks" off other threads
8022 * to do that as needed.
8023 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
8024 * "->recovery" and create a thread at ->sync_thread.
8025 * When the thread finishes it sets MD_RECOVERY_DONE
8026 * and wakeups up this thread which will reap the thread and finish up.
8027 * This thread also removes any faulty devices (with nr_pending == 0).
8029 * The overall approach is:
8030 * 1/ if the superblock needs updating, update it.
8031 * 2/ If a recovery thread is running, don't do anything else.
8032 * 3/ If recovery has finished, clean up, possibly marking spares active.
8033 * 4/ If there are any faulty devices, remove them.
8034 * 5/ If array is degraded, try to add spares devices
8035 * 6/ If array has spares or is not in-sync, start a resync thread.
8037 void md_check_recovery(struct mddev *mddev)
8039 if (mddev->suspended)
8043 bitmap_daemon_work(mddev);
8045 if (signal_pending(current)) {
8046 if (mddev->pers->sync_request && !mddev->external) {
8047 printk(KERN_INFO "md: %s in immediate safe mode\n",
8049 mddev->safemode = 2;
8051 flush_signals(current);
8054 if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
8057 (mddev->flags & MD_UPDATE_SB_FLAGS & ~ (1<<MD_CHANGE_PENDING)) ||
8058 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
8059 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
8060 (mddev->external == 0 && mddev->safemode == 1) ||
8061 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
8062 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
8066 if (mddev_trylock(mddev)) {
8070 /* On a read-only array we can:
8071 * - remove failed devices
8072 * - add already-in_sync devices if the array itself
8074 * As we only add devices that are already in-sync,
8075 * we can activate the spares immediately.
8077 remove_and_add_spares(mddev, NULL);
8078 /* There is no thread, but we need to call
8079 * ->spare_active and clear saved_raid_disk
8081 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8082 md_reap_sync_thread(mddev);
8083 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8087 if (!mddev->external) {
8089 spin_lock(&mddev->lock);
8090 if (mddev->safemode &&
8091 !atomic_read(&mddev->writes_pending) &&
8093 mddev->recovery_cp == MaxSector) {
8096 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
8098 if (mddev->safemode == 1)
8099 mddev->safemode = 0;
8100 spin_unlock(&mddev->lock);
8102 sysfs_notify_dirent_safe(mddev->sysfs_state);
8105 if (mddev->flags & MD_UPDATE_SB_FLAGS) {
8106 if (mddev_is_clustered(mddev))
8107 md_cluster_ops->metadata_update_start(mddev);
8108 md_update_sb(mddev, 0);
8109 if (mddev_is_clustered(mddev))
8110 md_cluster_ops->metadata_update_finish(mddev);
8113 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
8114 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
8115 /* resync/recovery still happening */
8116 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8119 if (mddev->sync_thread) {
8120 md_reap_sync_thread(mddev);
8123 /* Set RUNNING before clearing NEEDED to avoid
8124 * any transients in the value of "sync_action".
8126 mddev->curr_resync_completed = 0;
8127 spin_lock(&mddev->lock);
8128 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
8129 spin_unlock(&mddev->lock);
8130 /* Clear some bits that don't mean anything, but
8133 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
8134 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
8136 if (!test_and_clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
8137 test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
8139 /* no recovery is running.
8140 * remove any failed drives, then
8141 * add spares if possible.
8142 * Spares are also removed and re-added, to allow
8143 * the personality to fail the re-add.
8146 if (mddev->reshape_position != MaxSector) {
8147 if (mddev->pers->check_reshape == NULL ||
8148 mddev->pers->check_reshape(mddev) != 0)
8149 /* Cannot proceed */
8151 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
8152 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8153 } else if ((spares = remove_and_add_spares(mddev, NULL))) {
8154 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8155 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
8156 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
8157 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8158 } else if (mddev->recovery_cp < MaxSector) {
8159 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8160 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8161 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
8162 /* nothing to be done ... */
8165 if (mddev->pers->sync_request) {
8167 /* We are adding a device or devices to an array
8168 * which has the bitmap stored on all devices.
8169 * So make sure all bitmap pages get written
8171 bitmap_write_all(mddev->bitmap);
8173 INIT_WORK(&mddev->del_work, md_start_sync);
8174 queue_work(md_misc_wq, &mddev->del_work);
8178 if (!mddev->sync_thread) {
8179 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
8180 wake_up(&resync_wait);
8181 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
8183 if (mddev->sysfs_action)
8184 sysfs_notify_dirent_safe(mddev->sysfs_action);
8187 wake_up(&mddev->sb_wait);
8188 mddev_unlock(mddev);
8191 EXPORT_SYMBOL(md_check_recovery);
8193 void md_reap_sync_thread(struct mddev *mddev)
8195 struct md_rdev *rdev;
8197 /* resync has finished, collect result */
8198 md_unregister_thread(&mddev->sync_thread);
8199 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8200 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
8202 /* activate any spares */
8203 if (mddev->pers->spare_active(mddev)) {
8204 sysfs_notify(&mddev->kobj, NULL,
8206 set_bit(MD_CHANGE_DEVS, &mddev->flags);
8209 if (mddev_is_clustered(mddev))
8210 md_cluster_ops->metadata_update_start(mddev);
8211 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8212 mddev->pers->finish_reshape)
8213 mddev->pers->finish_reshape(mddev);
8215 /* If array is no-longer degraded, then any saved_raid_disk
8216 * information must be scrapped.
8218 if (!mddev->degraded)
8219 rdev_for_each(rdev, mddev)
8220 rdev->saved_raid_disk = -1;
8222 md_update_sb(mddev, 1);
8223 if (mddev_is_clustered(mddev))
8224 md_cluster_ops->metadata_update_finish(mddev);
8225 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
8226 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8227 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
8228 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
8229 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
8230 wake_up(&resync_wait);
8231 /* flag recovery needed just to double check */
8232 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8233 sysfs_notify_dirent_safe(mddev->sysfs_action);
8234 md_new_event(mddev);
8235 if (mddev->event_work.func)
8236 queue_work(md_misc_wq, &mddev->event_work);
8238 EXPORT_SYMBOL(md_reap_sync_thread);
8240 void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev)
8242 sysfs_notify_dirent_safe(rdev->sysfs_state);
8243 wait_event_timeout(rdev->blocked_wait,
8244 !test_bit(Blocked, &rdev->flags) &&
8245 !test_bit(BlockedBadBlocks, &rdev->flags),
8246 msecs_to_jiffies(5000));
8247 rdev_dec_pending(rdev, mddev);
8249 EXPORT_SYMBOL(md_wait_for_blocked_rdev);
8251 void md_finish_reshape(struct mddev *mddev)
8253 /* called be personality module when reshape completes. */
8254 struct md_rdev *rdev;
8256 rdev_for_each(rdev, mddev) {
8257 if (rdev->data_offset > rdev->new_data_offset)
8258 rdev->sectors += rdev->data_offset - rdev->new_data_offset;
8260 rdev->sectors -= rdev->new_data_offset - rdev->data_offset;
8261 rdev->data_offset = rdev->new_data_offset;
8264 EXPORT_SYMBOL(md_finish_reshape);
8266 /* Bad block management.
8267 * We can record which blocks on each device are 'bad' and so just
8268 * fail those blocks, or that stripe, rather than the whole device.
8269 * Entries in the bad-block table are 64bits wide. This comprises:
8270 * Length of bad-range, in sectors: 0-511 for lengths 1-512
8271 * Start of bad-range, sector offset, 54 bits (allows 8 exbibytes)
8272 * A 'shift' can be set so that larger blocks are tracked and
8273 * consequently larger devices can be covered.
8274 * 'Acknowledged' flag - 1 bit. - the most significant bit.
8276 * Locking of the bad-block table uses a seqlock so md_is_badblock
8277 * might need to retry if it is very unlucky.
8278 * We will sometimes want to check for bad blocks in a bi_end_io function,
8279 * so we use the write_seqlock_irq variant.
8281 * When looking for a bad block we specify a range and want to
8282 * know if any block in the range is bad. So we binary-search
8283 * to the last range that starts at-or-before the given endpoint,
8284 * (or "before the sector after the target range")
8285 * then see if it ends after the given start.
8287 * 0 if there are no known bad blocks in the range
8288 * 1 if there are known bad block which are all acknowledged
8289 * -1 if there are bad blocks which have not yet been acknowledged in metadata.
8290 * plus the start/length of the first bad section we overlap.
8292 int md_is_badblock(struct badblocks *bb, sector_t s, int sectors,
8293 sector_t *first_bad, int *bad_sectors)
8299 sector_t target = s + sectors;
8302 if (bb->shift > 0) {
8303 /* round the start down, and the end up */
8305 target += (1<<bb->shift) - 1;
8306 target >>= bb->shift;
8307 sectors = target - s;
8309 /* 'target' is now the first block after the bad range */
8312 seq = read_seqbegin(&bb->lock);
8317 /* Binary search between lo and hi for 'target'
8318 * i.e. for the last range that starts before 'target'
8320 /* INVARIANT: ranges before 'lo' and at-or-after 'hi'
8321 * are known not to be the last range before target.
8322 * VARIANT: hi-lo is the number of possible
8323 * ranges, and decreases until it reaches 1
8325 while (hi - lo > 1) {
8326 int mid = (lo + hi) / 2;
8327 sector_t a = BB_OFFSET(p[mid]);
8329 /* This could still be the one, earlier ranges
8333 /* This and later ranges are definitely out. */
8336 /* 'lo' might be the last that started before target, but 'hi' isn't */
8338 /* need to check all range that end after 's' to see if
8339 * any are unacknowledged.
8342 BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) {
8343 if (BB_OFFSET(p[lo]) < target) {
8344 /* starts before the end, and finishes after
8345 * the start, so they must overlap
8347 if (rv != -1 && BB_ACK(p[lo]))
8351 *first_bad = BB_OFFSET(p[lo]);
8352 *bad_sectors = BB_LEN(p[lo]);
8358 if (read_seqretry(&bb->lock, seq))
8363 EXPORT_SYMBOL_GPL(md_is_badblock);
8366 * Add a range of bad blocks to the table.
8367 * This might extend the table, or might contract it
8368 * if two adjacent ranges can be merged.
8369 * We binary-search to find the 'insertion' point, then
8370 * decide how best to handle it.
8372 static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors,
8378 unsigned long flags;
8381 /* badblocks are disabled */
8385 /* round the start down, and the end up */
8386 sector_t next = s + sectors;
8388 next += (1<<bb->shift) - 1;
8393 write_seqlock_irqsave(&bb->lock, flags);
8398 /* Find the last range that starts at-or-before 's' */
8399 while (hi - lo > 1) {
8400 int mid = (lo + hi) / 2;
8401 sector_t a = BB_OFFSET(p[mid]);
8407 if (hi > lo && BB_OFFSET(p[lo]) > s)
8411 /* we found a range that might merge with the start
8414 sector_t a = BB_OFFSET(p[lo]);
8415 sector_t e = a + BB_LEN(p[lo]);
8416 int ack = BB_ACK(p[lo]);
8418 /* Yes, we can merge with a previous range */
8419 if (s == a && s + sectors >= e)
8420 /* new range covers old */
8423 ack = ack && acknowledged;
8425 if (e < s + sectors)
8427 if (e - a <= BB_MAX_LEN) {
8428 p[lo] = BB_MAKE(a, e-a, ack);
8431 /* does not all fit in one range,
8432 * make p[lo] maximal
8434 if (BB_LEN(p[lo]) != BB_MAX_LEN)
8435 p[lo] = BB_MAKE(a, BB_MAX_LEN, ack);
8441 if (sectors && hi < bb->count) {
8442 /* 'hi' points to the first range that starts after 's'.
8443 * Maybe we can merge with the start of that range */
8444 sector_t a = BB_OFFSET(p[hi]);
8445 sector_t e = a + BB_LEN(p[hi]);
8446 int ack = BB_ACK(p[hi]);
8447 if (a <= s + sectors) {
8448 /* merging is possible */
8449 if (e <= s + sectors) {
8454 ack = ack && acknowledged;
8457 if (e - a <= BB_MAX_LEN) {
8458 p[hi] = BB_MAKE(a, e-a, ack);
8461 p[hi] = BB_MAKE(a, BB_MAX_LEN, ack);
8469 if (sectors == 0 && hi < bb->count) {
8470 /* we might be able to combine lo and hi */
8471 /* Note: 's' is at the end of 'lo' */
8472 sector_t a = BB_OFFSET(p[hi]);
8473 int lolen = BB_LEN(p[lo]);
8474 int hilen = BB_LEN(p[hi]);
8475 int newlen = lolen + hilen - (s - a);
8476 if (s >= a && newlen < BB_MAX_LEN) {
8477 /* yes, we can combine them */
8478 int ack = BB_ACK(p[lo]) && BB_ACK(p[hi]);
8479 p[lo] = BB_MAKE(BB_OFFSET(p[lo]), newlen, ack);
8480 memmove(p + hi, p + hi + 1,
8481 (bb->count - hi - 1) * 8);
8486 /* didn't merge (it all).
8487 * Need to add a range just before 'hi' */
8488 if (bb->count >= MD_MAX_BADBLOCKS) {
8489 /* No room for more */
8493 int this_sectors = sectors;
8494 memmove(p + hi + 1, p + hi,
8495 (bb->count - hi) * 8);
8498 if (this_sectors > BB_MAX_LEN)
8499 this_sectors = BB_MAX_LEN;
8500 p[hi] = BB_MAKE(s, this_sectors, acknowledged);
8501 sectors -= this_sectors;
8508 bb->unacked_exist = 1;
8509 write_sequnlock_irqrestore(&bb->lock, flags);
8514 int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
8519 s += rdev->new_data_offset;
8521 s += rdev->data_offset;
8522 rv = md_set_badblocks(&rdev->badblocks,
8525 /* Make sure they get written out promptly */
8526 sysfs_notify_dirent_safe(rdev->sysfs_state);
8527 set_bit(MD_CHANGE_CLEAN, &rdev->mddev->flags);
8528 md_wakeup_thread(rdev->mddev->thread);
8532 EXPORT_SYMBOL_GPL(rdev_set_badblocks);
8535 * Remove a range of bad blocks from the table.
8536 * This may involve extending the table if we spilt a region,
8537 * but it must not fail. So if the table becomes full, we just
8538 * drop the remove request.
8540 static int md_clear_badblocks(struct badblocks *bb, sector_t s, int sectors)
8544 sector_t target = s + sectors;
8547 if (bb->shift > 0) {
8548 /* When clearing we round the start up and the end down.
8549 * This should not matter as the shift should align with
8550 * the block size and no rounding should ever be needed.
8551 * However it is better the think a block is bad when it
8552 * isn't than to think a block is not bad when it is.
8554 s += (1<<bb->shift) - 1;
8556 target >>= bb->shift;
8557 sectors = target - s;
8560 write_seqlock_irq(&bb->lock);
8565 /* Find the last range that starts before 'target' */
8566 while (hi - lo > 1) {
8567 int mid = (lo + hi) / 2;
8568 sector_t a = BB_OFFSET(p[mid]);
8575 /* p[lo] is the last range that could overlap the
8576 * current range. Earlier ranges could also overlap,
8577 * but only this one can overlap the end of the range.
8579 if (BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > target) {
8580 /* Partial overlap, leave the tail of this range */
8581 int ack = BB_ACK(p[lo]);
8582 sector_t a = BB_OFFSET(p[lo]);
8583 sector_t end = a + BB_LEN(p[lo]);
8586 /* we need to split this range */
8587 if (bb->count >= MD_MAX_BADBLOCKS) {
8591 memmove(p+lo+1, p+lo, (bb->count - lo) * 8);
8593 p[lo] = BB_MAKE(a, s-a, ack);
8596 p[lo] = BB_MAKE(target, end - target, ack);
8597 /* there is no longer an overlap */
8602 BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) {
8603 /* This range does overlap */
8604 if (BB_OFFSET(p[lo]) < s) {
8605 /* Keep the early parts of this range. */
8606 int ack = BB_ACK(p[lo]);
8607 sector_t start = BB_OFFSET(p[lo]);
8608 p[lo] = BB_MAKE(start, s - start, ack);
8609 /* now low doesn't overlap, so.. */
8614 /* 'lo' is strictly before, 'hi' is strictly after,
8615 * anything between needs to be discarded
8618 memmove(p+lo+1, p+hi, (bb->count - hi) * 8);
8619 bb->count -= (hi - lo - 1);
8625 write_sequnlock_irq(&bb->lock);
8629 int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
8633 s += rdev->new_data_offset;
8635 s += rdev->data_offset;
8636 return md_clear_badblocks(&rdev->badblocks,
8639 EXPORT_SYMBOL_GPL(rdev_clear_badblocks);
8642 * Acknowledge all bad blocks in a list.
8643 * This only succeeds if ->changed is clear. It is used by
8644 * in-kernel metadata updates
8646 void md_ack_all_badblocks(struct badblocks *bb)
8648 if (bb->page == NULL || bb->changed)
8649 /* no point even trying */
8651 write_seqlock_irq(&bb->lock);
8653 if (bb->changed == 0 && bb->unacked_exist) {
8656 for (i = 0; i < bb->count ; i++) {
8657 if (!BB_ACK(p[i])) {
8658 sector_t start = BB_OFFSET(p[i]);
8659 int len = BB_LEN(p[i]);
8660 p[i] = BB_MAKE(start, len, 1);
8663 bb->unacked_exist = 0;
8665 write_sequnlock_irq(&bb->lock);
8667 EXPORT_SYMBOL_GPL(md_ack_all_badblocks);
8669 /* sysfs access to bad-blocks list.
8670 * We present two files.
8671 * 'bad-blocks' lists sector numbers and lengths of ranges that
8672 * are recorded as bad. The list is truncated to fit within
8673 * the one-page limit of sysfs.
8674 * Writing "sector length" to this file adds an acknowledged
8676 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
8677 * been acknowledged. Writing to this file adds bad blocks
8678 * without acknowledging them. This is largely for testing.
8682 badblocks_show(struct badblocks *bb, char *page, int unack)
8693 seq = read_seqbegin(&bb->lock);
8698 while (len < PAGE_SIZE && i < bb->count) {
8699 sector_t s = BB_OFFSET(p[i]);
8700 unsigned int length = BB_LEN(p[i]);
8701 int ack = BB_ACK(p[i]);
8707 len += snprintf(page+len, PAGE_SIZE-len, "%llu %u\n",
8708 (unsigned long long)s << bb->shift,
8709 length << bb->shift);
8711 if (unack && len == 0)
8712 bb->unacked_exist = 0;
8714 if (read_seqretry(&bb->lock, seq))
8723 badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack)
8725 unsigned long long sector;
8729 /* Allow clearing via sysfs *only* for testing/debugging.
8730 * Normally only a successful write may clear a badblock
8733 if (page[0] == '-') {
8737 #endif /* DO_DEBUG */
8739 switch (sscanf(page, "%llu %d%c", §or, &length, &newline)) {
8741 if (newline != '\n')
8753 md_clear_badblocks(bb, sector, length);
8756 #endif /* DO_DEBUG */
8757 if (md_set_badblocks(bb, sector, length, !unack))
8763 static int md_notify_reboot(struct notifier_block *this,
8764 unsigned long code, void *x)
8766 struct list_head *tmp;
8767 struct mddev *mddev;
8770 for_each_mddev(mddev, tmp) {
8771 if (mddev_trylock(mddev)) {
8773 __md_stop_writes(mddev);
8774 if (mddev->persistent)
8775 mddev->safemode = 2;
8776 mddev_unlock(mddev);
8781 * certain more exotic SCSI devices are known to be
8782 * volatile wrt too early system reboots. While the
8783 * right place to handle this issue is the given
8784 * driver, we do want to have a safe RAID driver ...
8792 static struct notifier_block md_notifier = {
8793 .notifier_call = md_notify_reboot,
8795 .priority = INT_MAX, /* before any real devices */
8798 static void md_geninit(void)
8800 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
8802 proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops);
8805 static int __init md_init(void)
8809 md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0);
8813 md_misc_wq = alloc_workqueue("md_misc", 0, 0);
8817 if ((ret = register_blkdev(MD_MAJOR, "md")) < 0)
8820 if ((ret = register_blkdev(0, "mdp")) < 0)
8824 blk_register_region(MKDEV(MD_MAJOR, 0), 512, THIS_MODULE,
8825 md_probe, NULL, NULL);
8826 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
8827 md_probe, NULL, NULL);
8829 register_reboot_notifier(&md_notifier);
8830 raid_table_header = register_sysctl_table(raid_root_table);
8836 unregister_blkdev(MD_MAJOR, "md");
8838 destroy_workqueue(md_misc_wq);
8840 destroy_workqueue(md_wq);
8845 void md_reload_sb(struct mddev *mddev)
8847 struct md_rdev *rdev, *tmp;
8849 rdev_for_each_safe(rdev, tmp, mddev) {
8850 rdev->sb_loaded = 0;
8851 ClearPageUptodate(rdev->sb_page);
8853 mddev->raid_disks = 0;
8855 rdev_for_each_safe(rdev, tmp, mddev) {
8856 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
8857 /* since we don't write to faulty devices, we figure out if the
8858 * disk is faulty by comparing events
8860 if (mddev->events > sb->events)
8861 set_bit(Faulty, &rdev->flags);
8865 EXPORT_SYMBOL(md_reload_sb);
8870 * Searches all registered partitions for autorun RAID arrays
8874 static LIST_HEAD(all_detected_devices);
8875 struct detected_devices_node {
8876 struct list_head list;
8880 void md_autodetect_dev(dev_t dev)
8882 struct detected_devices_node *node_detected_dev;
8884 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
8885 if (node_detected_dev) {
8886 node_detected_dev->dev = dev;
8887 list_add_tail(&node_detected_dev->list, &all_detected_devices);
8889 printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed"
8890 ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev));
8894 static void autostart_arrays(int part)
8896 struct md_rdev *rdev;
8897 struct detected_devices_node *node_detected_dev;
8899 int i_scanned, i_passed;
8904 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
8906 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
8908 node_detected_dev = list_entry(all_detected_devices.next,
8909 struct detected_devices_node, list);
8910 list_del(&node_detected_dev->list);
8911 dev = node_detected_dev->dev;
8912 kfree(node_detected_dev);
8913 rdev = md_import_device(dev,0, 90);
8917 if (test_bit(Faulty, &rdev->flags))
8920 set_bit(AutoDetected, &rdev->flags);
8921 list_add(&rdev->same_set, &pending_raid_disks);
8925 printk(KERN_INFO "md: Scanned %d and added %d devices.\n",
8926 i_scanned, i_passed);
8928 autorun_devices(part);
8931 #endif /* !MODULE */
8933 static __exit void md_exit(void)
8935 struct mddev *mddev;
8936 struct list_head *tmp;
8939 blk_unregister_region(MKDEV(MD_MAJOR,0), 512);
8940 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
8942 unregister_blkdev(MD_MAJOR,"md");
8943 unregister_blkdev(mdp_major, "mdp");
8944 unregister_reboot_notifier(&md_notifier);
8945 unregister_sysctl_table(raid_table_header);
8947 /* We cannot unload the modules while some process is
8948 * waiting for us in select() or poll() - wake them up
8951 while (waitqueue_active(&md_event_waiters)) {
8952 /* not safe to leave yet */
8953 wake_up(&md_event_waiters);
8957 remove_proc_entry("mdstat", NULL);
8959 for_each_mddev(mddev, tmp) {
8960 export_array(mddev);
8961 mddev->hold_active = 0;
8963 destroy_workqueue(md_misc_wq);
8964 destroy_workqueue(md_wq);
8967 subsys_initcall(md_init);
8968 module_exit(md_exit)
8970 static int get_ro(char *buffer, struct kernel_param *kp)
8972 return sprintf(buffer, "%d", start_readonly);
8974 static int set_ro(const char *val, struct kernel_param *kp)
8977 int num = simple_strtoul(val, &e, 10);
8978 if (*val && (*e == '\0' || *e == '\n')) {
8979 start_readonly = num;
8985 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
8986 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
8987 module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR);
8989 MODULE_LICENSE("GPL");
8990 MODULE_DESCRIPTION("MD RAID framework");
8992 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);