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;
260 blk_queue_split(q, &bio, q->bio_split);
262 if (mddev == NULL || mddev->pers == NULL
267 if (mddev->ro == 1 && unlikely(rw == WRITE)) {
268 if (bio_sectors(bio) != 0)
269 bio->bi_error = -EROFS;
273 smp_rmb(); /* Ensure implications of 'active' are visible */
275 if (mddev->suspended) {
278 prepare_to_wait(&mddev->sb_wait, &__wait,
279 TASK_UNINTERRUPTIBLE);
280 if (!mddev->suspended)
286 finish_wait(&mddev->sb_wait, &__wait);
288 atomic_inc(&mddev->active_io);
292 * save the sectors now since our bio can
293 * go away inside make_request
295 sectors = bio_sectors(bio);
296 mddev->pers->make_request(mddev, bio);
298 cpu = part_stat_lock();
299 part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]);
300 part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw], sectors);
303 if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended)
304 wake_up(&mddev->sb_wait);
307 /* mddev_suspend makes sure no new requests are submitted
308 * to the device, and that any requests that have been submitted
309 * are completely handled.
310 * Once mddev_detach() is called and completes, the module will be
313 void mddev_suspend(struct mddev *mddev)
315 BUG_ON(mddev->suspended);
316 mddev->suspended = 1;
318 wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0);
319 mddev->pers->quiesce(mddev, 1);
321 del_timer_sync(&mddev->safemode_timer);
323 EXPORT_SYMBOL_GPL(mddev_suspend);
325 void mddev_resume(struct mddev *mddev)
327 mddev->suspended = 0;
328 wake_up(&mddev->sb_wait);
329 mddev->pers->quiesce(mddev, 0);
331 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
332 md_wakeup_thread(mddev->thread);
333 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
335 EXPORT_SYMBOL_GPL(mddev_resume);
337 int mddev_congested(struct mddev *mddev, int bits)
339 struct md_personality *pers = mddev->pers;
343 if (mddev->suspended)
345 else if (pers && pers->congested)
346 ret = pers->congested(mddev, bits);
350 EXPORT_SYMBOL_GPL(mddev_congested);
351 static int md_congested(void *data, int bits)
353 struct mddev *mddev = data;
354 return mddev_congested(mddev, bits);
358 * Generic flush handling for md
361 static void md_end_flush(struct bio *bio)
363 struct md_rdev *rdev = bio->bi_private;
364 struct mddev *mddev = rdev->mddev;
366 rdev_dec_pending(rdev, mddev);
368 if (atomic_dec_and_test(&mddev->flush_pending)) {
369 /* The pre-request flush has finished */
370 queue_work(md_wq, &mddev->flush_work);
375 static void md_submit_flush_data(struct work_struct *ws);
377 static void submit_flushes(struct work_struct *ws)
379 struct mddev *mddev = container_of(ws, struct mddev, flush_work);
380 struct md_rdev *rdev;
382 INIT_WORK(&mddev->flush_work, md_submit_flush_data);
383 atomic_set(&mddev->flush_pending, 1);
385 rdev_for_each_rcu(rdev, mddev)
386 if (rdev->raid_disk >= 0 &&
387 !test_bit(Faulty, &rdev->flags)) {
388 /* Take two references, one is dropped
389 * when request finishes, one after
390 * we reclaim rcu_read_lock
393 atomic_inc(&rdev->nr_pending);
394 atomic_inc(&rdev->nr_pending);
396 bi = bio_alloc_mddev(GFP_NOIO, 0, mddev);
397 bi->bi_end_io = md_end_flush;
398 bi->bi_private = rdev;
399 bi->bi_bdev = rdev->bdev;
400 atomic_inc(&mddev->flush_pending);
401 submit_bio(WRITE_FLUSH, bi);
403 rdev_dec_pending(rdev, mddev);
406 if (atomic_dec_and_test(&mddev->flush_pending))
407 queue_work(md_wq, &mddev->flush_work);
410 static void md_submit_flush_data(struct work_struct *ws)
412 struct mddev *mddev = container_of(ws, struct mddev, flush_work);
413 struct bio *bio = mddev->flush_bio;
415 if (bio->bi_iter.bi_size == 0)
416 /* an empty barrier - all done */
419 bio->bi_rw &= ~REQ_FLUSH;
420 mddev->pers->make_request(mddev, bio);
423 mddev->flush_bio = NULL;
424 wake_up(&mddev->sb_wait);
427 void md_flush_request(struct mddev *mddev, struct bio *bio)
429 spin_lock_irq(&mddev->lock);
430 wait_event_lock_irq(mddev->sb_wait,
433 mddev->flush_bio = bio;
434 spin_unlock_irq(&mddev->lock);
436 INIT_WORK(&mddev->flush_work, submit_flushes);
437 queue_work(md_wq, &mddev->flush_work);
439 EXPORT_SYMBOL(md_flush_request);
441 void md_unplug(struct blk_plug_cb *cb, bool from_schedule)
443 struct mddev *mddev = cb->data;
444 md_wakeup_thread(mddev->thread);
447 EXPORT_SYMBOL(md_unplug);
449 static inline struct mddev *mddev_get(struct mddev *mddev)
451 atomic_inc(&mddev->active);
455 static void mddev_delayed_delete(struct work_struct *ws);
457 static void mddev_put(struct mddev *mddev)
459 struct bio_set *bs = NULL;
461 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
463 if (!mddev->raid_disks && list_empty(&mddev->disks) &&
464 mddev->ctime == 0 && !mddev->hold_active) {
465 /* Array is not configured at all, and not held active,
467 list_del_init(&mddev->all_mddevs);
469 mddev->bio_set = NULL;
470 if (mddev->gendisk) {
471 /* We did a probe so need to clean up. Call
472 * queue_work inside the spinlock so that
473 * flush_workqueue() after mddev_find will
474 * succeed in waiting for the work to be done.
476 INIT_WORK(&mddev->del_work, mddev_delayed_delete);
477 queue_work(md_misc_wq, &mddev->del_work);
481 spin_unlock(&all_mddevs_lock);
486 static void md_safemode_timeout(unsigned long data);
488 void mddev_init(struct mddev *mddev)
490 mutex_init(&mddev->open_mutex);
491 mutex_init(&mddev->reconfig_mutex);
492 mutex_init(&mddev->bitmap_info.mutex);
493 INIT_LIST_HEAD(&mddev->disks);
494 INIT_LIST_HEAD(&mddev->all_mddevs);
495 setup_timer(&mddev->safemode_timer, md_safemode_timeout,
496 (unsigned long) mddev);
497 atomic_set(&mddev->active, 1);
498 atomic_set(&mddev->openers, 0);
499 atomic_set(&mddev->active_io, 0);
500 spin_lock_init(&mddev->lock);
501 atomic_set(&mddev->flush_pending, 0);
502 init_waitqueue_head(&mddev->sb_wait);
503 init_waitqueue_head(&mddev->recovery_wait);
504 mddev->reshape_position = MaxSector;
505 mddev->reshape_backwards = 0;
506 mddev->last_sync_action = "none";
507 mddev->resync_min = 0;
508 mddev->resync_max = MaxSector;
509 mddev->level = LEVEL_NONE;
511 EXPORT_SYMBOL_GPL(mddev_init);
513 static struct mddev *mddev_find(dev_t unit)
515 struct mddev *mddev, *new = NULL;
517 if (unit && MAJOR(unit) != MD_MAJOR)
518 unit &= ~((1<<MdpMinorShift)-1);
521 spin_lock(&all_mddevs_lock);
524 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
525 if (mddev->unit == unit) {
527 spin_unlock(&all_mddevs_lock);
533 list_add(&new->all_mddevs, &all_mddevs);
534 spin_unlock(&all_mddevs_lock);
535 new->hold_active = UNTIL_IOCTL;
539 /* find an unused unit number */
540 static int next_minor = 512;
541 int start = next_minor;
545 dev = MKDEV(MD_MAJOR, next_minor);
547 if (next_minor > MINORMASK)
549 if (next_minor == start) {
550 /* Oh dear, all in use. */
551 spin_unlock(&all_mddevs_lock);
557 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
558 if (mddev->unit == dev) {
564 new->md_minor = MINOR(dev);
565 new->hold_active = UNTIL_STOP;
566 list_add(&new->all_mddevs, &all_mddevs);
567 spin_unlock(&all_mddevs_lock);
570 spin_unlock(&all_mddevs_lock);
572 new = kzalloc(sizeof(*new), GFP_KERNEL);
577 if (MAJOR(unit) == MD_MAJOR)
578 new->md_minor = MINOR(unit);
580 new->md_minor = MINOR(unit) >> MdpMinorShift;
587 static struct attribute_group md_redundancy_group;
589 void mddev_unlock(struct mddev *mddev)
591 if (mddev->to_remove) {
592 /* These cannot be removed under reconfig_mutex as
593 * an access to the files will try to take reconfig_mutex
594 * while holding the file unremovable, which leads to
596 * So hold set sysfs_active while the remove in happeing,
597 * and anything else which might set ->to_remove or my
598 * otherwise change the sysfs namespace will fail with
599 * -EBUSY if sysfs_active is still set.
600 * We set sysfs_active under reconfig_mutex and elsewhere
601 * test it under the same mutex to ensure its correct value
604 struct attribute_group *to_remove = mddev->to_remove;
605 mddev->to_remove = NULL;
606 mddev->sysfs_active = 1;
607 mutex_unlock(&mddev->reconfig_mutex);
609 if (mddev->kobj.sd) {
610 if (to_remove != &md_redundancy_group)
611 sysfs_remove_group(&mddev->kobj, to_remove);
612 if (mddev->pers == NULL ||
613 mddev->pers->sync_request == NULL) {
614 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
615 if (mddev->sysfs_action)
616 sysfs_put(mddev->sysfs_action);
617 mddev->sysfs_action = NULL;
620 mddev->sysfs_active = 0;
622 mutex_unlock(&mddev->reconfig_mutex);
624 /* As we've dropped the mutex we need a spinlock to
625 * make sure the thread doesn't disappear
627 spin_lock(&pers_lock);
628 md_wakeup_thread(mddev->thread);
629 spin_unlock(&pers_lock);
631 EXPORT_SYMBOL_GPL(mddev_unlock);
633 struct md_rdev *md_find_rdev_nr_rcu(struct mddev *mddev, int nr)
635 struct md_rdev *rdev;
637 rdev_for_each_rcu(rdev, mddev)
638 if (rdev->desc_nr == nr)
643 EXPORT_SYMBOL_GPL(md_find_rdev_nr_rcu);
645 static struct md_rdev *find_rdev(struct mddev *mddev, dev_t dev)
647 struct md_rdev *rdev;
649 rdev_for_each(rdev, mddev)
650 if (rdev->bdev->bd_dev == dev)
656 static struct md_rdev *find_rdev_rcu(struct mddev *mddev, dev_t dev)
658 struct md_rdev *rdev;
660 rdev_for_each_rcu(rdev, mddev)
661 if (rdev->bdev->bd_dev == dev)
667 static struct md_personality *find_pers(int level, char *clevel)
669 struct md_personality *pers;
670 list_for_each_entry(pers, &pers_list, list) {
671 if (level != LEVEL_NONE && pers->level == level)
673 if (strcmp(pers->name, clevel)==0)
679 /* return the offset of the super block in 512byte sectors */
680 static inline sector_t calc_dev_sboffset(struct md_rdev *rdev)
682 sector_t num_sectors = i_size_read(rdev->bdev->bd_inode) / 512;
683 return MD_NEW_SIZE_SECTORS(num_sectors);
686 static int alloc_disk_sb(struct md_rdev *rdev)
688 rdev->sb_page = alloc_page(GFP_KERNEL);
689 if (!rdev->sb_page) {
690 printk(KERN_ALERT "md: out of memory.\n");
697 void md_rdev_clear(struct md_rdev *rdev)
700 put_page(rdev->sb_page);
702 rdev->sb_page = NULL;
707 put_page(rdev->bb_page);
708 rdev->bb_page = NULL;
710 kfree(rdev->badblocks.page);
711 rdev->badblocks.page = NULL;
713 EXPORT_SYMBOL_GPL(md_rdev_clear);
715 static void super_written(struct bio *bio)
717 struct md_rdev *rdev = bio->bi_private;
718 struct mddev *mddev = rdev->mddev;
721 printk("md: super_written gets error=%d\n", bio->bi_error);
722 md_error(mddev, rdev);
725 if (atomic_dec_and_test(&mddev->pending_writes))
726 wake_up(&mddev->sb_wait);
730 void md_super_write(struct mddev *mddev, struct md_rdev *rdev,
731 sector_t sector, int size, struct page *page)
733 /* write first size bytes of page to sector of rdev
734 * Increment mddev->pending_writes before returning
735 * and decrement it on completion, waking up sb_wait
736 * if zero is reached.
737 * If an error occurred, call md_error
739 struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, mddev);
741 bio->bi_bdev = rdev->meta_bdev ? rdev->meta_bdev : rdev->bdev;
742 bio->bi_iter.bi_sector = sector;
743 bio_add_page(bio, page, size, 0);
744 bio->bi_private = rdev;
745 bio->bi_end_io = super_written;
747 atomic_inc(&mddev->pending_writes);
748 submit_bio(WRITE_FLUSH_FUA, bio);
751 void md_super_wait(struct mddev *mddev)
753 /* wait for all superblock writes that were scheduled to complete */
754 wait_event(mddev->sb_wait, atomic_read(&mddev->pending_writes)==0);
757 int sync_page_io(struct md_rdev *rdev, sector_t sector, int size,
758 struct page *page, int rw, bool metadata_op)
760 struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, rdev->mddev);
763 bio->bi_bdev = (metadata_op && rdev->meta_bdev) ?
764 rdev->meta_bdev : rdev->bdev;
766 bio->bi_iter.bi_sector = sector + rdev->sb_start;
767 else if (rdev->mddev->reshape_position != MaxSector &&
768 (rdev->mddev->reshape_backwards ==
769 (sector >= rdev->mddev->reshape_position)))
770 bio->bi_iter.bi_sector = sector + rdev->new_data_offset;
772 bio->bi_iter.bi_sector = sector + rdev->data_offset;
773 bio_add_page(bio, page, size, 0);
774 submit_bio_wait(rw, bio);
776 ret = !bio->bi_error;
780 EXPORT_SYMBOL_GPL(sync_page_io);
782 static int read_disk_sb(struct md_rdev *rdev, int size)
784 char b[BDEVNAME_SIZE];
789 if (!sync_page_io(rdev, 0, size, rdev->sb_page, READ, true))
795 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
796 bdevname(rdev->bdev,b));
800 static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
802 return sb1->set_uuid0 == sb2->set_uuid0 &&
803 sb1->set_uuid1 == sb2->set_uuid1 &&
804 sb1->set_uuid2 == sb2->set_uuid2 &&
805 sb1->set_uuid3 == sb2->set_uuid3;
808 static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
811 mdp_super_t *tmp1, *tmp2;
813 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
814 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
816 if (!tmp1 || !tmp2) {
818 printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n");
826 * nr_disks is not constant
831 ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0);
838 static u32 md_csum_fold(u32 csum)
840 csum = (csum & 0xffff) + (csum >> 16);
841 return (csum & 0xffff) + (csum >> 16);
844 static unsigned int calc_sb_csum(mdp_super_t *sb)
847 u32 *sb32 = (u32*)sb;
849 unsigned int disk_csum, csum;
851 disk_csum = sb->sb_csum;
854 for (i = 0; i < MD_SB_BYTES/4 ; i++)
856 csum = (newcsum & 0xffffffff) + (newcsum>>32);
859 /* This used to use csum_partial, which was wrong for several
860 * reasons including that different results are returned on
861 * different architectures. It isn't critical that we get exactly
862 * the same return value as before (we always csum_fold before
863 * testing, and that removes any differences). However as we
864 * know that csum_partial always returned a 16bit value on
865 * alphas, do a fold to maximise conformity to previous behaviour.
867 sb->sb_csum = md_csum_fold(disk_csum);
869 sb->sb_csum = disk_csum;
875 * Handle superblock details.
876 * We want to be able to handle multiple superblock formats
877 * so we have a common interface to them all, and an array of
878 * different handlers.
879 * We rely on user-space to write the initial superblock, and support
880 * reading and updating of superblocks.
881 * Interface methods are:
882 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version)
883 * loads and validates a superblock on dev.
884 * if refdev != NULL, compare superblocks on both devices
886 * 0 - dev has a superblock that is compatible with refdev
887 * 1 - dev has a superblock that is compatible and newer than refdev
888 * so dev should be used as the refdev in future
889 * -EINVAL superblock incompatible or invalid
890 * -othererror e.g. -EIO
892 * int validate_super(struct mddev *mddev, struct md_rdev *dev)
893 * Verify that dev is acceptable into mddev.
894 * The first time, mddev->raid_disks will be 0, and data from
895 * dev should be merged in. Subsequent calls check that dev
896 * is new enough. Return 0 or -EINVAL
898 * void sync_super(struct mddev *mddev, struct md_rdev *dev)
899 * Update the superblock for rdev with data in mddev
900 * This does not write to disc.
906 struct module *owner;
907 int (*load_super)(struct md_rdev *rdev,
908 struct md_rdev *refdev,
910 int (*validate_super)(struct mddev *mddev,
911 struct md_rdev *rdev);
912 void (*sync_super)(struct mddev *mddev,
913 struct md_rdev *rdev);
914 unsigned long long (*rdev_size_change)(struct md_rdev *rdev,
915 sector_t num_sectors);
916 int (*allow_new_offset)(struct md_rdev *rdev,
917 unsigned long long new_offset);
921 * Check that the given mddev has no bitmap.
923 * This function is called from the run method of all personalities that do not
924 * support bitmaps. It prints an error message and returns non-zero if mddev
925 * has a bitmap. Otherwise, it returns 0.
928 int md_check_no_bitmap(struct mddev *mddev)
930 if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset)
932 printk(KERN_ERR "%s: bitmaps are not supported for %s\n",
933 mdname(mddev), mddev->pers->name);
936 EXPORT_SYMBOL(md_check_no_bitmap);
939 * load_super for 0.90.0
941 static int super_90_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
943 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
948 * Calculate the position of the superblock (512byte sectors),
949 * it's at the end of the disk.
951 * It also happens to be a multiple of 4Kb.
953 rdev->sb_start = calc_dev_sboffset(rdev);
955 ret = read_disk_sb(rdev, MD_SB_BYTES);
960 bdevname(rdev->bdev, b);
961 sb = page_address(rdev->sb_page);
963 if (sb->md_magic != MD_SB_MAGIC) {
964 printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
969 if (sb->major_version != 0 ||
970 sb->minor_version < 90 ||
971 sb->minor_version > 91) {
972 printk(KERN_WARNING "Bad version number %d.%d on %s\n",
973 sb->major_version, sb->minor_version,
978 if (sb->raid_disks <= 0)
981 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
982 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
987 rdev->preferred_minor = sb->md_minor;
988 rdev->data_offset = 0;
989 rdev->new_data_offset = 0;
990 rdev->sb_size = MD_SB_BYTES;
991 rdev->badblocks.shift = -1;
993 if (sb->level == LEVEL_MULTIPATH)
996 rdev->desc_nr = sb->this_disk.number;
1002 mdp_super_t *refsb = page_address(refdev->sb_page);
1003 if (!uuid_equal(refsb, sb)) {
1004 printk(KERN_WARNING "md: %s has different UUID to %s\n",
1005 b, bdevname(refdev->bdev,b2));
1008 if (!sb_equal(refsb, sb)) {
1009 printk(KERN_WARNING "md: %s has same UUID"
1010 " but different superblock to %s\n",
1011 b, bdevname(refdev->bdev, b2));
1015 ev2 = md_event(refsb);
1021 rdev->sectors = rdev->sb_start;
1022 /* Limit to 4TB as metadata cannot record more than that.
1023 * (not needed for Linear and RAID0 as metadata doesn't
1026 if (rdev->sectors >= (2ULL << 32) && sb->level >= 1)
1027 rdev->sectors = (2ULL << 32) - 2;
1029 if (rdev->sectors < ((sector_t)sb->size) * 2 && sb->level >= 1)
1030 /* "this cannot possibly happen" ... */
1038 * validate_super for 0.90.0
1040 static int super_90_validate(struct mddev *mddev, struct md_rdev *rdev)
1043 mdp_super_t *sb = page_address(rdev->sb_page);
1044 __u64 ev1 = md_event(sb);
1046 rdev->raid_disk = -1;
1047 clear_bit(Faulty, &rdev->flags);
1048 clear_bit(In_sync, &rdev->flags);
1049 clear_bit(Bitmap_sync, &rdev->flags);
1050 clear_bit(WriteMostly, &rdev->flags);
1052 if (mddev->raid_disks == 0) {
1053 mddev->major_version = 0;
1054 mddev->minor_version = sb->minor_version;
1055 mddev->patch_version = sb->patch_version;
1056 mddev->external = 0;
1057 mddev->chunk_sectors = sb->chunk_size >> 9;
1058 mddev->ctime = sb->ctime;
1059 mddev->utime = sb->utime;
1060 mddev->level = sb->level;
1061 mddev->clevel[0] = 0;
1062 mddev->layout = sb->layout;
1063 mddev->raid_disks = sb->raid_disks;
1064 mddev->dev_sectors = ((sector_t)sb->size) * 2;
1065 mddev->events = ev1;
1066 mddev->bitmap_info.offset = 0;
1067 mddev->bitmap_info.space = 0;
1068 /* bitmap can use 60 K after the 4K superblocks */
1069 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
1070 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
1071 mddev->reshape_backwards = 0;
1073 if (mddev->minor_version >= 91) {
1074 mddev->reshape_position = sb->reshape_position;
1075 mddev->delta_disks = sb->delta_disks;
1076 mddev->new_level = sb->new_level;
1077 mddev->new_layout = sb->new_layout;
1078 mddev->new_chunk_sectors = sb->new_chunk >> 9;
1079 if (mddev->delta_disks < 0)
1080 mddev->reshape_backwards = 1;
1082 mddev->reshape_position = MaxSector;
1083 mddev->delta_disks = 0;
1084 mddev->new_level = mddev->level;
1085 mddev->new_layout = mddev->layout;
1086 mddev->new_chunk_sectors = mddev->chunk_sectors;
1089 if (sb->state & (1<<MD_SB_CLEAN))
1090 mddev->recovery_cp = MaxSector;
1092 if (sb->events_hi == sb->cp_events_hi &&
1093 sb->events_lo == sb->cp_events_lo) {
1094 mddev->recovery_cp = sb->recovery_cp;
1096 mddev->recovery_cp = 0;
1099 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
1100 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
1101 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
1102 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
1104 mddev->max_disks = MD_SB_DISKS;
1106 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
1107 mddev->bitmap_info.file == NULL) {
1108 mddev->bitmap_info.offset =
1109 mddev->bitmap_info.default_offset;
1110 mddev->bitmap_info.space =
1111 mddev->bitmap_info.default_space;
1114 } else if (mddev->pers == NULL) {
1115 /* Insist on good event counter while assembling, except
1116 * for spares (which don't need an event count) */
1118 if (sb->disks[rdev->desc_nr].state & (
1119 (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE)))
1120 if (ev1 < mddev->events)
1122 } else if (mddev->bitmap) {
1123 /* if adding to array with a bitmap, then we can accept an
1124 * older device ... but not too old.
1126 if (ev1 < mddev->bitmap->events_cleared)
1128 if (ev1 < mddev->events)
1129 set_bit(Bitmap_sync, &rdev->flags);
1131 if (ev1 < mddev->events)
1132 /* just a hot-add of a new device, leave raid_disk at -1 */
1136 if (mddev->level != LEVEL_MULTIPATH) {
1137 desc = sb->disks + rdev->desc_nr;
1139 if (desc->state & (1<<MD_DISK_FAULTY))
1140 set_bit(Faulty, &rdev->flags);
1141 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
1142 desc->raid_disk < mddev->raid_disks */) {
1143 set_bit(In_sync, &rdev->flags);
1144 rdev->raid_disk = desc->raid_disk;
1145 rdev->saved_raid_disk = desc->raid_disk;
1146 } else if (desc->state & (1<<MD_DISK_ACTIVE)) {
1147 /* active but not in sync implies recovery up to
1148 * reshape position. We don't know exactly where
1149 * that is, so set to zero for now */
1150 if (mddev->minor_version >= 91) {
1151 rdev->recovery_offset = 0;
1152 rdev->raid_disk = desc->raid_disk;
1155 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
1156 set_bit(WriteMostly, &rdev->flags);
1157 } else /* MULTIPATH are always insync */
1158 set_bit(In_sync, &rdev->flags);
1163 * sync_super for 0.90.0
1165 static void super_90_sync(struct mddev *mddev, struct md_rdev *rdev)
1168 struct md_rdev *rdev2;
1169 int next_spare = mddev->raid_disks;
1171 /* make rdev->sb match mddev data..
1174 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1175 * 3/ any empty disks < next_spare become removed
1177 * disks[0] gets initialised to REMOVED because
1178 * we cannot be sure from other fields if it has
1179 * been initialised or not.
1182 int active=0, working=0,failed=0,spare=0,nr_disks=0;
1184 rdev->sb_size = MD_SB_BYTES;
1186 sb = page_address(rdev->sb_page);
1188 memset(sb, 0, sizeof(*sb));
1190 sb->md_magic = MD_SB_MAGIC;
1191 sb->major_version = mddev->major_version;
1192 sb->patch_version = mddev->patch_version;
1193 sb->gvalid_words = 0; /* ignored */
1194 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
1195 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
1196 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
1197 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
1199 sb->ctime = mddev->ctime;
1200 sb->level = mddev->level;
1201 sb->size = mddev->dev_sectors / 2;
1202 sb->raid_disks = mddev->raid_disks;
1203 sb->md_minor = mddev->md_minor;
1204 sb->not_persistent = 0;
1205 sb->utime = mddev->utime;
1207 sb->events_hi = (mddev->events>>32);
1208 sb->events_lo = (u32)mddev->events;
1210 if (mddev->reshape_position == MaxSector)
1211 sb->minor_version = 90;
1213 sb->minor_version = 91;
1214 sb->reshape_position = mddev->reshape_position;
1215 sb->new_level = mddev->new_level;
1216 sb->delta_disks = mddev->delta_disks;
1217 sb->new_layout = mddev->new_layout;
1218 sb->new_chunk = mddev->new_chunk_sectors << 9;
1220 mddev->minor_version = sb->minor_version;
1223 sb->recovery_cp = mddev->recovery_cp;
1224 sb->cp_events_hi = (mddev->events>>32);
1225 sb->cp_events_lo = (u32)mddev->events;
1226 if (mddev->recovery_cp == MaxSector)
1227 sb->state = (1<< MD_SB_CLEAN);
1229 sb->recovery_cp = 0;
1231 sb->layout = mddev->layout;
1232 sb->chunk_size = mddev->chunk_sectors << 9;
1234 if (mddev->bitmap && mddev->bitmap_info.file == NULL)
1235 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
1237 sb->disks[0].state = (1<<MD_DISK_REMOVED);
1238 rdev_for_each(rdev2, mddev) {
1241 int is_active = test_bit(In_sync, &rdev2->flags);
1243 if (rdev2->raid_disk >= 0 &&
1244 sb->minor_version >= 91)
1245 /* we have nowhere to store the recovery_offset,
1246 * but if it is not below the reshape_position,
1247 * we can piggy-back on that.
1250 if (rdev2->raid_disk < 0 ||
1251 test_bit(Faulty, &rdev2->flags))
1254 desc_nr = rdev2->raid_disk;
1256 desc_nr = next_spare++;
1257 rdev2->desc_nr = desc_nr;
1258 d = &sb->disks[rdev2->desc_nr];
1260 d->number = rdev2->desc_nr;
1261 d->major = MAJOR(rdev2->bdev->bd_dev);
1262 d->minor = MINOR(rdev2->bdev->bd_dev);
1264 d->raid_disk = rdev2->raid_disk;
1266 d->raid_disk = rdev2->desc_nr; /* compatibility */
1267 if (test_bit(Faulty, &rdev2->flags))
1268 d->state = (1<<MD_DISK_FAULTY);
1269 else if (is_active) {
1270 d->state = (1<<MD_DISK_ACTIVE);
1271 if (test_bit(In_sync, &rdev2->flags))
1272 d->state |= (1<<MD_DISK_SYNC);
1280 if (test_bit(WriteMostly, &rdev2->flags))
1281 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1283 /* now set the "removed" and "faulty" bits on any missing devices */
1284 for (i=0 ; i < mddev->raid_disks ; i++) {
1285 mdp_disk_t *d = &sb->disks[i];
1286 if (d->state == 0 && d->number == 0) {
1289 d->state = (1<<MD_DISK_REMOVED);
1290 d->state |= (1<<MD_DISK_FAULTY);
1294 sb->nr_disks = nr_disks;
1295 sb->active_disks = active;
1296 sb->working_disks = working;
1297 sb->failed_disks = failed;
1298 sb->spare_disks = spare;
1300 sb->this_disk = sb->disks[rdev->desc_nr];
1301 sb->sb_csum = calc_sb_csum(sb);
1305 * rdev_size_change for 0.90.0
1307 static unsigned long long
1308 super_90_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
1310 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1311 return 0; /* component must fit device */
1312 if (rdev->mddev->bitmap_info.offset)
1313 return 0; /* can't move bitmap */
1314 rdev->sb_start = calc_dev_sboffset(rdev);
1315 if (!num_sectors || num_sectors > rdev->sb_start)
1316 num_sectors = rdev->sb_start;
1317 /* Limit to 4TB as metadata cannot record more than that.
1318 * 4TB == 2^32 KB, or 2*2^32 sectors.
1320 if (num_sectors >= (2ULL << 32) && rdev->mddev->level >= 1)
1321 num_sectors = (2ULL << 32) - 2;
1322 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1324 md_super_wait(rdev->mddev);
1329 super_90_allow_new_offset(struct md_rdev *rdev, unsigned long long new_offset)
1331 /* non-zero offset changes not possible with v0.90 */
1332 return new_offset == 0;
1336 * version 1 superblock
1339 static __le32 calc_sb_1_csum(struct mdp_superblock_1 *sb)
1343 unsigned long long newcsum;
1344 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1345 __le32 *isuper = (__le32*)sb;
1347 disk_csum = sb->sb_csum;
1350 for (; size >= 4; size -= 4)
1351 newcsum += le32_to_cpu(*isuper++);
1354 newcsum += le16_to_cpu(*(__le16*) isuper);
1356 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1357 sb->sb_csum = disk_csum;
1358 return cpu_to_le32(csum);
1361 static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors,
1363 static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
1365 struct mdp_superblock_1 *sb;
1369 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1373 * Calculate the position of the superblock in 512byte sectors.
1374 * It is always aligned to a 4K boundary and
1375 * depeding on minor_version, it can be:
1376 * 0: At least 8K, but less than 12K, from end of device
1377 * 1: At start of device
1378 * 2: 4K from start of device.
1380 switch(minor_version) {
1382 sb_start = i_size_read(rdev->bdev->bd_inode) >> 9;
1384 sb_start &= ~(sector_t)(4*2-1);
1395 rdev->sb_start = sb_start;
1397 /* superblock is rarely larger than 1K, but it can be larger,
1398 * and it is safe to read 4k, so we do that
1400 ret = read_disk_sb(rdev, 4096);
1401 if (ret) return ret;
1403 sb = page_address(rdev->sb_page);
1405 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1406 sb->major_version != cpu_to_le32(1) ||
1407 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1408 le64_to_cpu(sb->super_offset) != rdev->sb_start ||
1409 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1412 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1413 printk("md: invalid superblock checksum on %s\n",
1414 bdevname(rdev->bdev,b));
1417 if (le64_to_cpu(sb->data_size) < 10) {
1418 printk("md: data_size too small on %s\n",
1419 bdevname(rdev->bdev,b));
1424 memcmp(sb->pad3, sb->pad3+1, sizeof(sb->pad3) - sizeof(sb->pad3[1])))
1425 /* Some padding is non-zero, might be a new feature */
1428 rdev->preferred_minor = 0xffff;
1429 rdev->data_offset = le64_to_cpu(sb->data_offset);
1430 rdev->new_data_offset = rdev->data_offset;
1431 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE) &&
1432 (le32_to_cpu(sb->feature_map) & MD_FEATURE_NEW_OFFSET))
1433 rdev->new_data_offset += (s32)le32_to_cpu(sb->new_offset);
1434 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1436 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1437 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1438 if (rdev->sb_size & bmask)
1439 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1442 && rdev->data_offset < sb_start + (rdev->sb_size/512))
1445 && rdev->new_data_offset < sb_start + (rdev->sb_size/512))
1448 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1451 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1453 if (!rdev->bb_page) {
1454 rdev->bb_page = alloc_page(GFP_KERNEL);
1458 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BAD_BLOCKS) &&
1459 rdev->badblocks.count == 0) {
1460 /* need to load the bad block list.
1461 * Currently we limit it to one page.
1467 int sectors = le16_to_cpu(sb->bblog_size);
1468 if (sectors > (PAGE_SIZE / 512))
1470 offset = le32_to_cpu(sb->bblog_offset);
1473 bb_sector = (long long)offset;
1474 if (!sync_page_io(rdev, bb_sector, sectors << 9,
1475 rdev->bb_page, READ, true))
1477 bbp = (u64 *)page_address(rdev->bb_page);
1478 rdev->badblocks.shift = sb->bblog_shift;
1479 for (i = 0 ; i < (sectors << (9-3)) ; i++, bbp++) {
1480 u64 bb = le64_to_cpu(*bbp);
1481 int count = bb & (0x3ff);
1482 u64 sector = bb >> 10;
1483 sector <<= sb->bblog_shift;
1484 count <<= sb->bblog_shift;
1487 if (md_set_badblocks(&rdev->badblocks,
1488 sector, count, 1) == 0)
1491 } else if (sb->bblog_offset != 0)
1492 rdev->badblocks.shift = 0;
1498 struct mdp_superblock_1 *refsb = page_address(refdev->sb_page);
1500 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1501 sb->level != refsb->level ||
1502 sb->layout != refsb->layout ||
1503 sb->chunksize != refsb->chunksize) {
1504 printk(KERN_WARNING "md: %s has strangely different"
1505 " superblock to %s\n",
1506 bdevname(rdev->bdev,b),
1507 bdevname(refdev->bdev,b2));
1510 ev1 = le64_to_cpu(sb->events);
1511 ev2 = le64_to_cpu(refsb->events);
1518 if (minor_version) {
1519 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9);
1520 sectors -= rdev->data_offset;
1522 sectors = rdev->sb_start;
1523 if (sectors < le64_to_cpu(sb->data_size))
1525 rdev->sectors = le64_to_cpu(sb->data_size);
1529 static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev)
1531 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
1532 __u64 ev1 = le64_to_cpu(sb->events);
1534 rdev->raid_disk = -1;
1535 clear_bit(Faulty, &rdev->flags);
1536 clear_bit(In_sync, &rdev->flags);
1537 clear_bit(Bitmap_sync, &rdev->flags);
1538 clear_bit(WriteMostly, &rdev->flags);
1540 if (mddev->raid_disks == 0) {
1541 mddev->major_version = 1;
1542 mddev->patch_version = 0;
1543 mddev->external = 0;
1544 mddev->chunk_sectors = le32_to_cpu(sb->chunksize);
1545 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1546 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1547 mddev->level = le32_to_cpu(sb->level);
1548 mddev->clevel[0] = 0;
1549 mddev->layout = le32_to_cpu(sb->layout);
1550 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1551 mddev->dev_sectors = le64_to_cpu(sb->size);
1552 mddev->events = ev1;
1553 mddev->bitmap_info.offset = 0;
1554 mddev->bitmap_info.space = 0;
1555 /* Default location for bitmap is 1K after superblock
1556 * using 3K - total of 4K
1558 mddev->bitmap_info.default_offset = 1024 >> 9;
1559 mddev->bitmap_info.default_space = (4096-1024) >> 9;
1560 mddev->reshape_backwards = 0;
1562 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1563 memcpy(mddev->uuid, sb->set_uuid, 16);
1565 mddev->max_disks = (4096-256)/2;
1567 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1568 mddev->bitmap_info.file == NULL) {
1569 mddev->bitmap_info.offset =
1570 (__s32)le32_to_cpu(sb->bitmap_offset);
1571 /* Metadata doesn't record how much space is available.
1572 * For 1.0, we assume we can use up to the superblock
1573 * if before, else to 4K beyond superblock.
1574 * For others, assume no change is possible.
1576 if (mddev->minor_version > 0)
1577 mddev->bitmap_info.space = 0;
1578 else if (mddev->bitmap_info.offset > 0)
1579 mddev->bitmap_info.space =
1580 8 - mddev->bitmap_info.offset;
1582 mddev->bitmap_info.space =
1583 -mddev->bitmap_info.offset;
1586 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1587 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1588 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1589 mddev->new_level = le32_to_cpu(sb->new_level);
1590 mddev->new_layout = le32_to_cpu(sb->new_layout);
1591 mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk);
1592 if (mddev->delta_disks < 0 ||
1593 (mddev->delta_disks == 0 &&
1594 (le32_to_cpu(sb->feature_map)
1595 & MD_FEATURE_RESHAPE_BACKWARDS)))
1596 mddev->reshape_backwards = 1;
1598 mddev->reshape_position = MaxSector;
1599 mddev->delta_disks = 0;
1600 mddev->new_level = mddev->level;
1601 mddev->new_layout = mddev->layout;
1602 mddev->new_chunk_sectors = mddev->chunk_sectors;
1605 } else if (mddev->pers == NULL) {
1606 /* Insist of good event counter while assembling, except for
1607 * spares (which don't need an event count) */
1609 if (rdev->desc_nr >= 0 &&
1610 rdev->desc_nr < le32_to_cpu(sb->max_dev) &&
1611 le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < 0xfffe)
1612 if (ev1 < mddev->events)
1614 } else if (mddev->bitmap) {
1615 /* If adding to array with a bitmap, then we can accept an
1616 * older device, but not too old.
1618 if (ev1 < mddev->bitmap->events_cleared)
1620 if (ev1 < mddev->events)
1621 set_bit(Bitmap_sync, &rdev->flags);
1623 if (ev1 < mddev->events)
1624 /* just a hot-add of a new device, leave raid_disk at -1 */
1627 if (mddev->level != LEVEL_MULTIPATH) {
1629 if (rdev->desc_nr < 0 ||
1630 rdev->desc_nr >= le32_to_cpu(sb->max_dev)) {
1634 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1636 case 0xffff: /* spare */
1638 case 0xfffe: /* faulty */
1639 set_bit(Faulty, &rdev->flags);
1642 rdev->saved_raid_disk = role;
1643 if ((le32_to_cpu(sb->feature_map) &
1644 MD_FEATURE_RECOVERY_OFFSET)) {
1645 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1646 if (!(le32_to_cpu(sb->feature_map) &
1647 MD_FEATURE_RECOVERY_BITMAP))
1648 rdev->saved_raid_disk = -1;
1650 set_bit(In_sync, &rdev->flags);
1651 rdev->raid_disk = role;
1654 if (sb->devflags & WriteMostly1)
1655 set_bit(WriteMostly, &rdev->flags);
1656 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_REPLACEMENT)
1657 set_bit(Replacement, &rdev->flags);
1658 } else /* MULTIPATH are always insync */
1659 set_bit(In_sync, &rdev->flags);
1664 static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev)
1666 struct mdp_superblock_1 *sb;
1667 struct md_rdev *rdev2;
1669 /* make rdev->sb match mddev and rdev data. */
1671 sb = page_address(rdev->sb_page);
1673 sb->feature_map = 0;
1675 sb->recovery_offset = cpu_to_le64(0);
1676 memset(sb->pad3, 0, sizeof(sb->pad3));
1678 sb->utime = cpu_to_le64((__u64)mddev->utime);
1679 sb->events = cpu_to_le64(mddev->events);
1681 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1683 sb->resync_offset = cpu_to_le64(0);
1685 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
1687 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
1688 sb->size = cpu_to_le64(mddev->dev_sectors);
1689 sb->chunksize = cpu_to_le32(mddev->chunk_sectors);
1690 sb->level = cpu_to_le32(mddev->level);
1691 sb->layout = cpu_to_le32(mddev->layout);
1693 if (test_bit(WriteMostly, &rdev->flags))
1694 sb->devflags |= WriteMostly1;
1696 sb->devflags &= ~WriteMostly1;
1697 sb->data_offset = cpu_to_le64(rdev->data_offset);
1698 sb->data_size = cpu_to_le64(rdev->sectors);
1700 if (mddev->bitmap && mddev->bitmap_info.file == NULL) {
1701 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset);
1702 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
1705 if (rdev->raid_disk >= 0 &&
1706 !test_bit(In_sync, &rdev->flags)) {
1708 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1709 sb->recovery_offset =
1710 cpu_to_le64(rdev->recovery_offset);
1711 if (rdev->saved_raid_disk >= 0 && mddev->bitmap)
1713 cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP);
1715 if (test_bit(Replacement, &rdev->flags))
1717 cpu_to_le32(MD_FEATURE_REPLACEMENT);
1719 if (mddev->reshape_position != MaxSector) {
1720 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1721 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1722 sb->new_layout = cpu_to_le32(mddev->new_layout);
1723 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1724 sb->new_level = cpu_to_le32(mddev->new_level);
1725 sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors);
1726 if (mddev->delta_disks == 0 &&
1727 mddev->reshape_backwards)
1729 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS);
1730 if (rdev->new_data_offset != rdev->data_offset) {
1732 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET);
1733 sb->new_offset = cpu_to_le32((__u32)(rdev->new_data_offset
1734 - rdev->data_offset));
1738 if (mddev_is_clustered(mddev))
1739 sb->feature_map |= cpu_to_le32(MD_FEATURE_CLUSTERED);
1741 if (rdev->badblocks.count == 0)
1742 /* Nothing to do for bad blocks*/ ;
1743 else if (sb->bblog_offset == 0)
1744 /* Cannot record bad blocks on this device */
1745 md_error(mddev, rdev);
1747 struct badblocks *bb = &rdev->badblocks;
1748 u64 *bbp = (u64 *)page_address(rdev->bb_page);
1750 sb->feature_map |= cpu_to_le32(MD_FEATURE_BAD_BLOCKS);
1755 seq = read_seqbegin(&bb->lock);
1757 memset(bbp, 0xff, PAGE_SIZE);
1759 for (i = 0 ; i < bb->count ; i++) {
1760 u64 internal_bb = p[i];
1761 u64 store_bb = ((BB_OFFSET(internal_bb) << 10)
1762 | BB_LEN(internal_bb));
1763 bbp[i] = cpu_to_le64(store_bb);
1766 if (read_seqretry(&bb->lock, seq))
1769 bb->sector = (rdev->sb_start +
1770 (int)le32_to_cpu(sb->bblog_offset));
1771 bb->size = le16_to_cpu(sb->bblog_size);
1776 rdev_for_each(rdev2, mddev)
1777 if (rdev2->desc_nr+1 > max_dev)
1778 max_dev = rdev2->desc_nr+1;
1780 if (max_dev > le32_to_cpu(sb->max_dev)) {
1782 sb->max_dev = cpu_to_le32(max_dev);
1783 rdev->sb_size = max_dev * 2 + 256;
1784 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1785 if (rdev->sb_size & bmask)
1786 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1788 max_dev = le32_to_cpu(sb->max_dev);
1790 for (i=0; i<max_dev;i++)
1791 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1793 rdev_for_each(rdev2, mddev) {
1795 if (test_bit(Faulty, &rdev2->flags))
1796 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1797 else if (test_bit(In_sync, &rdev2->flags))
1798 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1799 else if (rdev2->raid_disk >= 0)
1800 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1802 sb->dev_roles[i] = cpu_to_le16(0xffff);
1805 sb->sb_csum = calc_sb_1_csum(sb);
1808 static unsigned long long
1809 super_1_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
1811 struct mdp_superblock_1 *sb;
1812 sector_t max_sectors;
1813 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1814 return 0; /* component must fit device */
1815 if (rdev->data_offset != rdev->new_data_offset)
1816 return 0; /* too confusing */
1817 if (rdev->sb_start < rdev->data_offset) {
1818 /* minor versions 1 and 2; superblock before data */
1819 max_sectors = i_size_read(rdev->bdev->bd_inode) >> 9;
1820 max_sectors -= rdev->data_offset;
1821 if (!num_sectors || num_sectors > max_sectors)
1822 num_sectors = max_sectors;
1823 } else if (rdev->mddev->bitmap_info.offset) {
1824 /* minor version 0 with bitmap we can't move */
1827 /* minor version 0; superblock after data */
1829 sb_start = (i_size_read(rdev->bdev->bd_inode) >> 9) - 8*2;
1830 sb_start &= ~(sector_t)(4*2 - 1);
1831 max_sectors = rdev->sectors + sb_start - rdev->sb_start;
1832 if (!num_sectors || num_sectors > max_sectors)
1833 num_sectors = max_sectors;
1834 rdev->sb_start = sb_start;
1836 sb = page_address(rdev->sb_page);
1837 sb->data_size = cpu_to_le64(num_sectors);
1838 sb->super_offset = rdev->sb_start;
1839 sb->sb_csum = calc_sb_1_csum(sb);
1840 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1842 md_super_wait(rdev->mddev);
1848 super_1_allow_new_offset(struct md_rdev *rdev,
1849 unsigned long long new_offset)
1851 /* All necessary checks on new >= old have been done */
1852 struct bitmap *bitmap;
1853 if (new_offset >= rdev->data_offset)
1856 /* with 1.0 metadata, there is no metadata to tread on
1857 * so we can always move back */
1858 if (rdev->mddev->minor_version == 0)
1861 /* otherwise we must be sure not to step on
1862 * any metadata, so stay:
1863 * 36K beyond start of superblock
1864 * beyond end of badblocks
1865 * beyond write-intent bitmap
1867 if (rdev->sb_start + (32+4)*2 > new_offset)
1869 bitmap = rdev->mddev->bitmap;
1870 if (bitmap && !rdev->mddev->bitmap_info.file &&
1871 rdev->sb_start + rdev->mddev->bitmap_info.offset +
1872 bitmap->storage.file_pages * (PAGE_SIZE>>9) > new_offset)
1874 if (rdev->badblocks.sector + rdev->badblocks.size > new_offset)
1880 static struct super_type super_types[] = {
1883 .owner = THIS_MODULE,
1884 .load_super = super_90_load,
1885 .validate_super = super_90_validate,
1886 .sync_super = super_90_sync,
1887 .rdev_size_change = super_90_rdev_size_change,
1888 .allow_new_offset = super_90_allow_new_offset,
1892 .owner = THIS_MODULE,
1893 .load_super = super_1_load,
1894 .validate_super = super_1_validate,
1895 .sync_super = super_1_sync,
1896 .rdev_size_change = super_1_rdev_size_change,
1897 .allow_new_offset = super_1_allow_new_offset,
1901 static void sync_super(struct mddev *mddev, struct md_rdev *rdev)
1903 if (mddev->sync_super) {
1904 mddev->sync_super(mddev, rdev);
1908 BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types));
1910 super_types[mddev->major_version].sync_super(mddev, rdev);
1913 static int match_mddev_units(struct mddev *mddev1, struct mddev *mddev2)
1915 struct md_rdev *rdev, *rdev2;
1918 rdev_for_each_rcu(rdev, mddev1)
1919 rdev_for_each_rcu(rdev2, mddev2)
1920 if (rdev->bdev->bd_contains ==
1921 rdev2->bdev->bd_contains) {
1929 static LIST_HEAD(pending_raid_disks);
1932 * Try to register data integrity profile for an mddev
1934 * This is called when an array is started and after a disk has been kicked
1935 * from the array. It only succeeds if all working and active component devices
1936 * are integrity capable with matching profiles.
1938 int md_integrity_register(struct mddev *mddev)
1940 struct md_rdev *rdev, *reference = NULL;
1942 if (list_empty(&mddev->disks))
1943 return 0; /* nothing to do */
1944 if (!mddev->gendisk || blk_get_integrity(mddev->gendisk))
1945 return 0; /* shouldn't register, or already is */
1946 rdev_for_each(rdev, mddev) {
1947 /* skip spares and non-functional disks */
1948 if (test_bit(Faulty, &rdev->flags))
1950 if (rdev->raid_disk < 0)
1953 /* Use the first rdev as the reference */
1957 /* does this rdev's profile match the reference profile? */
1958 if (blk_integrity_compare(reference->bdev->bd_disk,
1959 rdev->bdev->bd_disk) < 0)
1962 if (!reference || !bdev_get_integrity(reference->bdev))
1965 * All component devices are integrity capable and have matching
1966 * profiles, register the common profile for the md device.
1968 if (blk_integrity_register(mddev->gendisk,
1969 bdev_get_integrity(reference->bdev)) != 0) {
1970 printk(KERN_ERR "md: failed to register integrity for %s\n",
1974 printk(KERN_NOTICE "md: data integrity enabled on %s\n", mdname(mddev));
1975 if (bioset_integrity_create(mddev->bio_set, BIO_POOL_SIZE)) {
1976 printk(KERN_ERR "md: failed to create integrity pool for %s\n",
1982 EXPORT_SYMBOL(md_integrity_register);
1984 /* Disable data integrity if non-capable/non-matching disk is being added */
1985 void md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev)
1987 struct blk_integrity *bi_rdev;
1988 struct blk_integrity *bi_mddev;
1990 if (!mddev->gendisk)
1993 bi_rdev = bdev_get_integrity(rdev->bdev);
1994 bi_mddev = blk_get_integrity(mddev->gendisk);
1996 if (!bi_mddev) /* nothing to do */
1998 if (rdev->raid_disk < 0) /* skip spares */
2000 if (bi_rdev && blk_integrity_compare(mddev->gendisk,
2001 rdev->bdev->bd_disk) >= 0)
2003 printk(KERN_NOTICE "disabling data integrity on %s\n", mdname(mddev));
2004 blk_integrity_unregister(mddev->gendisk);
2006 EXPORT_SYMBOL(md_integrity_add_rdev);
2008 static int bind_rdev_to_array(struct md_rdev *rdev, struct mddev *mddev)
2010 char b[BDEVNAME_SIZE];
2014 /* prevent duplicates */
2015 if (find_rdev(mddev, rdev->bdev->bd_dev))
2018 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2019 if (rdev->sectors && (mddev->dev_sectors == 0 ||
2020 rdev->sectors < mddev->dev_sectors)) {
2022 /* Cannot change size, so fail
2023 * If mddev->level <= 0, then we don't care
2024 * about aligning sizes (e.g. linear)
2026 if (mddev->level > 0)
2029 mddev->dev_sectors = rdev->sectors;
2032 /* Verify rdev->desc_nr is unique.
2033 * If it is -1, assign a free number, else
2034 * check number is not in use
2037 if (rdev->desc_nr < 0) {
2040 choice = mddev->raid_disks;
2041 while (md_find_rdev_nr_rcu(mddev, choice))
2043 rdev->desc_nr = choice;
2045 if (md_find_rdev_nr_rcu(mddev, rdev->desc_nr)) {
2051 if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) {
2052 printk(KERN_WARNING "md: %s: array is limited to %d devices\n",
2053 mdname(mddev), mddev->max_disks);
2056 bdevname(rdev->bdev,b);
2057 strreplace(b, '/', '!');
2059 rdev->mddev = mddev;
2060 printk(KERN_INFO "md: bind<%s>\n", b);
2062 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
2065 ko = &part_to_dev(rdev->bdev->bd_part)->kobj;
2066 if (sysfs_create_link(&rdev->kobj, ko, "block"))
2067 /* failure here is OK */;
2068 rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state");
2070 list_add_rcu(&rdev->same_set, &mddev->disks);
2071 bd_link_disk_holder(rdev->bdev, mddev->gendisk);
2073 /* May as well allow recovery to be retried once */
2074 mddev->recovery_disabled++;
2079 printk(KERN_WARNING "md: failed to register dev-%s for %s\n",
2084 static void md_delayed_delete(struct work_struct *ws)
2086 struct md_rdev *rdev = container_of(ws, struct md_rdev, del_work);
2087 kobject_del(&rdev->kobj);
2088 kobject_put(&rdev->kobj);
2091 static void unbind_rdev_from_array(struct md_rdev *rdev)
2093 char b[BDEVNAME_SIZE];
2095 bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk);
2096 list_del_rcu(&rdev->same_set);
2097 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
2099 sysfs_remove_link(&rdev->kobj, "block");
2100 sysfs_put(rdev->sysfs_state);
2101 rdev->sysfs_state = NULL;
2102 rdev->badblocks.count = 0;
2103 /* We need to delay this, otherwise we can deadlock when
2104 * writing to 'remove' to "dev/state". We also need
2105 * to delay it due to rcu usage.
2108 INIT_WORK(&rdev->del_work, md_delayed_delete);
2109 kobject_get(&rdev->kobj);
2110 queue_work(md_misc_wq, &rdev->del_work);
2114 * prevent the device from being mounted, repartitioned or
2115 * otherwise reused by a RAID array (or any other kernel
2116 * subsystem), by bd_claiming the device.
2118 static int lock_rdev(struct md_rdev *rdev, dev_t dev, int shared)
2121 struct block_device *bdev;
2122 char b[BDEVNAME_SIZE];
2124 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
2125 shared ? (struct md_rdev *)lock_rdev : rdev);
2127 printk(KERN_ERR "md: could not open %s.\n",
2128 __bdevname(dev, b));
2129 return PTR_ERR(bdev);
2135 static void unlock_rdev(struct md_rdev *rdev)
2137 struct block_device *bdev = rdev->bdev;
2139 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
2142 void md_autodetect_dev(dev_t dev);
2144 static void export_rdev(struct md_rdev *rdev)
2146 char b[BDEVNAME_SIZE];
2148 printk(KERN_INFO "md: export_rdev(%s)\n",
2149 bdevname(rdev->bdev,b));
2150 md_rdev_clear(rdev);
2152 if (test_bit(AutoDetected, &rdev->flags))
2153 md_autodetect_dev(rdev->bdev->bd_dev);
2156 kobject_put(&rdev->kobj);
2159 void md_kick_rdev_from_array(struct md_rdev *rdev)
2161 unbind_rdev_from_array(rdev);
2164 EXPORT_SYMBOL_GPL(md_kick_rdev_from_array);
2166 static void export_array(struct mddev *mddev)
2168 struct md_rdev *rdev;
2170 while (!list_empty(&mddev->disks)) {
2171 rdev = list_first_entry(&mddev->disks, struct md_rdev,
2173 md_kick_rdev_from_array(rdev);
2175 mddev->raid_disks = 0;
2176 mddev->major_version = 0;
2179 static void sync_sbs(struct mddev *mddev, int nospares)
2181 /* Update each superblock (in-memory image), but
2182 * if we are allowed to, skip spares which already
2183 * have the right event counter, or have one earlier
2184 * (which would mean they aren't being marked as dirty
2185 * with the rest of the array)
2187 struct md_rdev *rdev;
2188 rdev_for_each(rdev, mddev) {
2189 if (rdev->sb_events == mddev->events ||
2191 rdev->raid_disk < 0 &&
2192 rdev->sb_events+1 == mddev->events)) {
2193 /* Don't update this superblock */
2194 rdev->sb_loaded = 2;
2196 sync_super(mddev, rdev);
2197 rdev->sb_loaded = 1;
2202 static bool does_sb_need_changing(struct mddev *mddev)
2204 struct md_rdev *rdev;
2205 struct mdp_superblock_1 *sb;
2208 /* Find a good rdev */
2209 rdev_for_each(rdev, mddev)
2210 if ((rdev->raid_disk >= 0) && !test_bit(Faulty, &rdev->flags))
2213 /* No good device found. */
2217 sb = page_address(rdev->sb_page);
2218 /* Check if a device has become faulty or a spare become active */
2219 rdev_for_each(rdev, mddev) {
2220 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
2221 /* Device activated? */
2222 if (role == 0xffff && rdev->raid_disk >=0 &&
2223 !test_bit(Faulty, &rdev->flags))
2225 /* Device turned faulty? */
2226 if (test_bit(Faulty, &rdev->flags) && (role < 0xfffd))
2230 /* Check if any mddev parameters have changed */
2231 if ((mddev->dev_sectors != le64_to_cpu(sb->size)) ||
2232 (mddev->reshape_position != le64_to_cpu(sb->reshape_position)) ||
2233 (mddev->layout != le64_to_cpu(sb->layout)) ||
2234 (mddev->raid_disks != le32_to_cpu(sb->raid_disks)) ||
2235 (mddev->chunk_sectors != le32_to_cpu(sb->chunksize)))
2241 void md_update_sb(struct mddev *mddev, int force_change)
2243 struct md_rdev *rdev;
2246 int any_badblocks_changed = 0;
2251 set_bit(MD_CHANGE_DEVS, &mddev->flags);
2255 if (mddev_is_clustered(mddev)) {
2256 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
2258 ret = md_cluster_ops->metadata_update_start(mddev);
2259 /* Has someone else has updated the sb */
2260 if (!does_sb_need_changing(mddev)) {
2262 md_cluster_ops->metadata_update_cancel(mddev);
2263 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2268 /* First make sure individual recovery_offsets are correct */
2269 rdev_for_each(rdev, mddev) {
2270 if (rdev->raid_disk >= 0 &&
2271 mddev->delta_disks >= 0 &&
2272 !test_bit(In_sync, &rdev->flags) &&
2273 mddev->curr_resync_completed > rdev->recovery_offset)
2274 rdev->recovery_offset = mddev->curr_resync_completed;
2277 if (!mddev->persistent) {
2278 clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
2279 clear_bit(MD_CHANGE_DEVS, &mddev->flags);
2280 if (!mddev->external) {
2281 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2282 rdev_for_each(rdev, mddev) {
2283 if (rdev->badblocks.changed) {
2284 rdev->badblocks.changed = 0;
2285 md_ack_all_badblocks(&rdev->badblocks);
2286 md_error(mddev, rdev);
2288 clear_bit(Blocked, &rdev->flags);
2289 clear_bit(BlockedBadBlocks, &rdev->flags);
2290 wake_up(&rdev->blocked_wait);
2293 wake_up(&mddev->sb_wait);
2297 spin_lock(&mddev->lock);
2299 mddev->utime = get_seconds();
2301 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
2303 if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags))
2304 /* just a clean<-> dirty transition, possibly leave spares alone,
2305 * though if events isn't the right even/odd, we will have to do
2311 if (mddev->degraded)
2312 /* If the array is degraded, then skipping spares is both
2313 * dangerous and fairly pointless.
2314 * Dangerous because a device that was removed from the array
2315 * might have a event_count that still looks up-to-date,
2316 * so it can be re-added without a resync.
2317 * Pointless because if there are any spares to skip,
2318 * then a recovery will happen and soon that array won't
2319 * be degraded any more and the spare can go back to sleep then.
2323 sync_req = mddev->in_sync;
2325 /* If this is just a dirty<->clean transition, and the array is clean
2326 * and 'events' is odd, we can roll back to the previous clean state */
2328 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
2329 && mddev->can_decrease_events
2330 && mddev->events != 1) {
2332 mddev->can_decrease_events = 0;
2334 /* otherwise we have to go forward and ... */
2336 mddev->can_decrease_events = nospares;
2340 * This 64-bit counter should never wrap.
2341 * Either we are in around ~1 trillion A.C., assuming
2342 * 1 reboot per second, or we have a bug...
2344 WARN_ON(mddev->events == 0);
2346 rdev_for_each(rdev, mddev) {
2347 if (rdev->badblocks.changed)
2348 any_badblocks_changed++;
2349 if (test_bit(Faulty, &rdev->flags))
2350 set_bit(FaultRecorded, &rdev->flags);
2353 sync_sbs(mddev, nospares);
2354 spin_unlock(&mddev->lock);
2356 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2357 mdname(mddev), mddev->in_sync);
2359 bitmap_update_sb(mddev->bitmap);
2360 rdev_for_each(rdev, mddev) {
2361 char b[BDEVNAME_SIZE];
2363 if (rdev->sb_loaded != 1)
2364 continue; /* no noise on spare devices */
2366 if (!test_bit(Faulty, &rdev->flags)) {
2367 md_super_write(mddev,rdev,
2368 rdev->sb_start, rdev->sb_size,
2370 pr_debug("md: (write) %s's sb offset: %llu\n",
2371 bdevname(rdev->bdev, b),
2372 (unsigned long long)rdev->sb_start);
2373 rdev->sb_events = mddev->events;
2374 if (rdev->badblocks.size) {
2375 md_super_write(mddev, rdev,
2376 rdev->badblocks.sector,
2377 rdev->badblocks.size << 9,
2379 rdev->badblocks.size = 0;
2383 pr_debug("md: %s (skipping faulty)\n",
2384 bdevname(rdev->bdev, b));
2386 if (mddev->level == LEVEL_MULTIPATH)
2387 /* only need to write one superblock... */
2390 md_super_wait(mddev);
2391 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2393 spin_lock(&mddev->lock);
2394 if (mddev->in_sync != sync_req ||
2395 test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
2396 /* have to write it out again */
2397 spin_unlock(&mddev->lock);
2400 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2401 spin_unlock(&mddev->lock);
2402 wake_up(&mddev->sb_wait);
2403 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
2404 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
2406 rdev_for_each(rdev, mddev) {
2407 if (test_and_clear_bit(FaultRecorded, &rdev->flags))
2408 clear_bit(Blocked, &rdev->flags);
2410 if (any_badblocks_changed)
2411 md_ack_all_badblocks(&rdev->badblocks);
2412 clear_bit(BlockedBadBlocks, &rdev->flags);
2413 wake_up(&rdev->blocked_wait);
2416 if (mddev_is_clustered(mddev) && ret == 0)
2417 md_cluster_ops->metadata_update_finish(mddev);
2419 EXPORT_SYMBOL(md_update_sb);
2421 static int add_bound_rdev(struct md_rdev *rdev)
2423 struct mddev *mddev = rdev->mddev;
2426 if (!mddev->pers->hot_remove_disk) {
2427 /* If there is hot_add_disk but no hot_remove_disk
2428 * then added disks for geometry changes,
2429 * and should be added immediately.
2431 super_types[mddev->major_version].
2432 validate_super(mddev, rdev);
2433 err = mddev->pers->hot_add_disk(mddev, rdev);
2435 unbind_rdev_from_array(rdev);
2440 sysfs_notify_dirent_safe(rdev->sysfs_state);
2442 set_bit(MD_CHANGE_DEVS, &mddev->flags);
2443 if (mddev->degraded)
2444 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
2445 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2446 md_new_event(mddev);
2447 md_wakeup_thread(mddev->thread);
2451 /* words written to sysfs files may, or may not, be \n terminated.
2452 * We want to accept with case. For this we use cmd_match.
2454 static int cmd_match(const char *cmd, const char *str)
2456 /* See if cmd, written into a sysfs file, matches
2457 * str. They must either be the same, or cmd can
2458 * have a trailing newline
2460 while (*cmd && *str && *cmd == *str) {
2471 struct rdev_sysfs_entry {
2472 struct attribute attr;
2473 ssize_t (*show)(struct md_rdev *, char *);
2474 ssize_t (*store)(struct md_rdev *, const char *, size_t);
2478 state_show(struct md_rdev *rdev, char *page)
2482 unsigned long flags = ACCESS_ONCE(rdev->flags);
2484 if (test_bit(Faulty, &flags) ||
2485 rdev->badblocks.unacked_exist) {
2486 len+= sprintf(page+len, "%sfaulty",sep);
2489 if (test_bit(In_sync, &flags)) {
2490 len += sprintf(page+len, "%sin_sync",sep);
2493 if (test_bit(WriteMostly, &flags)) {
2494 len += sprintf(page+len, "%swrite_mostly",sep);
2497 if (test_bit(Blocked, &flags) ||
2498 (rdev->badblocks.unacked_exist
2499 && !test_bit(Faulty, &flags))) {
2500 len += sprintf(page+len, "%sblocked", sep);
2503 if (!test_bit(Faulty, &flags) &&
2504 !test_bit(In_sync, &flags)) {
2505 len += sprintf(page+len, "%sspare", sep);
2508 if (test_bit(WriteErrorSeen, &flags)) {
2509 len += sprintf(page+len, "%swrite_error", sep);
2512 if (test_bit(WantReplacement, &flags)) {
2513 len += sprintf(page+len, "%swant_replacement", sep);
2516 if (test_bit(Replacement, &flags)) {
2517 len += sprintf(page+len, "%sreplacement", sep);
2521 return len+sprintf(page+len, "\n");
2525 state_store(struct md_rdev *rdev, const char *buf, size_t len)
2528 * faulty - simulates an error
2529 * remove - disconnects the device
2530 * writemostly - sets write_mostly
2531 * -writemostly - clears write_mostly
2532 * blocked - sets the Blocked flags
2533 * -blocked - clears the Blocked and possibly simulates an error
2534 * insync - sets Insync providing device isn't active
2535 * -insync - clear Insync for a device with a slot assigned,
2536 * so that it gets rebuilt based on bitmap
2537 * write_error - sets WriteErrorSeen
2538 * -write_error - clears WriteErrorSeen
2541 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
2542 md_error(rdev->mddev, rdev);
2543 if (test_bit(Faulty, &rdev->flags))
2547 } else if (cmd_match(buf, "remove")) {
2548 if (rdev->raid_disk >= 0)
2551 struct mddev *mddev = rdev->mddev;
2553 if (mddev_is_clustered(mddev))
2554 err = md_cluster_ops->remove_disk(mddev, rdev);
2557 md_kick_rdev_from_array(rdev);
2559 md_update_sb(mddev, 1);
2560 md_new_event(mddev);
2563 } else if (cmd_match(buf, "writemostly")) {
2564 set_bit(WriteMostly, &rdev->flags);
2566 } else if (cmd_match(buf, "-writemostly")) {
2567 clear_bit(WriteMostly, &rdev->flags);
2569 } else if (cmd_match(buf, "blocked")) {
2570 set_bit(Blocked, &rdev->flags);
2572 } else if (cmd_match(buf, "-blocked")) {
2573 if (!test_bit(Faulty, &rdev->flags) &&
2574 rdev->badblocks.unacked_exist) {
2575 /* metadata handler doesn't understand badblocks,
2576 * so we need to fail the device
2578 md_error(rdev->mddev, rdev);
2580 clear_bit(Blocked, &rdev->flags);
2581 clear_bit(BlockedBadBlocks, &rdev->flags);
2582 wake_up(&rdev->blocked_wait);
2583 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2584 md_wakeup_thread(rdev->mddev->thread);
2587 } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) {
2588 set_bit(In_sync, &rdev->flags);
2590 } else if (cmd_match(buf, "-insync") && rdev->raid_disk >= 0) {
2591 if (rdev->mddev->pers == NULL) {
2592 clear_bit(In_sync, &rdev->flags);
2593 rdev->saved_raid_disk = rdev->raid_disk;
2594 rdev->raid_disk = -1;
2597 } else if (cmd_match(buf, "write_error")) {
2598 set_bit(WriteErrorSeen, &rdev->flags);
2600 } else if (cmd_match(buf, "-write_error")) {
2601 clear_bit(WriteErrorSeen, &rdev->flags);
2603 } else if (cmd_match(buf, "want_replacement")) {
2604 /* Any non-spare device that is not a replacement can
2605 * become want_replacement at any time, but we then need to
2606 * check if recovery is needed.
2608 if (rdev->raid_disk >= 0 &&
2609 !test_bit(Replacement, &rdev->flags))
2610 set_bit(WantReplacement, &rdev->flags);
2611 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2612 md_wakeup_thread(rdev->mddev->thread);
2614 } else if (cmd_match(buf, "-want_replacement")) {
2615 /* Clearing 'want_replacement' is always allowed.
2616 * Once replacements starts it is too late though.
2619 clear_bit(WantReplacement, &rdev->flags);
2620 } else if (cmd_match(buf, "replacement")) {
2621 /* Can only set a device as a replacement when array has not
2622 * yet been started. Once running, replacement is automatic
2623 * from spares, or by assigning 'slot'.
2625 if (rdev->mddev->pers)
2628 set_bit(Replacement, &rdev->flags);
2631 } else if (cmd_match(buf, "-replacement")) {
2632 /* Similarly, can only clear Replacement before start */
2633 if (rdev->mddev->pers)
2636 clear_bit(Replacement, &rdev->flags);
2639 } else if (cmd_match(buf, "re-add")) {
2640 if (test_bit(Faulty, &rdev->flags) && (rdev->raid_disk == -1)) {
2641 /* clear_bit is performed _after_ all the devices
2642 * have their local Faulty bit cleared. If any writes
2643 * happen in the meantime in the local node, they
2644 * will land in the local bitmap, which will be synced
2645 * by this node eventually
2647 if (!mddev_is_clustered(rdev->mddev) ||
2648 (err = md_cluster_ops->gather_bitmaps(rdev)) == 0) {
2649 clear_bit(Faulty, &rdev->flags);
2650 err = add_bound_rdev(rdev);
2656 sysfs_notify_dirent_safe(rdev->sysfs_state);
2657 return err ? err : len;
2659 static struct rdev_sysfs_entry rdev_state =
2660 __ATTR_PREALLOC(state, S_IRUGO|S_IWUSR, state_show, state_store);
2663 errors_show(struct md_rdev *rdev, char *page)
2665 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
2669 errors_store(struct md_rdev *rdev, const char *buf, size_t len)
2674 rv = kstrtouint(buf, 10, &n);
2677 atomic_set(&rdev->corrected_errors, n);
2680 static struct rdev_sysfs_entry rdev_errors =
2681 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
2684 slot_show(struct md_rdev *rdev, char *page)
2686 if (rdev->raid_disk < 0)
2687 return sprintf(page, "none\n");
2689 return sprintf(page, "%d\n", rdev->raid_disk);
2693 slot_store(struct md_rdev *rdev, const char *buf, size_t len)
2698 if (strncmp(buf, "none", 4)==0)
2701 err = kstrtouint(buf, 10, (unsigned int *)&slot);
2705 if (rdev->mddev->pers && slot == -1) {
2706 /* Setting 'slot' on an active array requires also
2707 * updating the 'rd%d' link, and communicating
2708 * with the personality with ->hot_*_disk.
2709 * For now we only support removing
2710 * failed/spare devices. This normally happens automatically,
2711 * but not when the metadata is externally managed.
2713 if (rdev->raid_disk == -1)
2715 /* personality does all needed checks */
2716 if (rdev->mddev->pers->hot_remove_disk == NULL)
2718 clear_bit(Blocked, &rdev->flags);
2719 remove_and_add_spares(rdev->mddev, rdev);
2720 if (rdev->raid_disk >= 0)
2722 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2723 md_wakeup_thread(rdev->mddev->thread);
2724 } else if (rdev->mddev->pers) {
2725 /* Activating a spare .. or possibly reactivating
2726 * if we ever get bitmaps working here.
2729 if (rdev->raid_disk != -1)
2732 if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery))
2735 if (rdev->mddev->pers->hot_add_disk == NULL)
2738 if (slot >= rdev->mddev->raid_disks &&
2739 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
2742 rdev->raid_disk = slot;
2743 if (test_bit(In_sync, &rdev->flags))
2744 rdev->saved_raid_disk = slot;
2746 rdev->saved_raid_disk = -1;
2747 clear_bit(In_sync, &rdev->flags);
2748 clear_bit(Bitmap_sync, &rdev->flags);
2749 remove_and_add_spares(rdev->mddev, rdev);
2750 if (rdev->raid_disk == -1)
2752 /* don't wakeup anyone, leave that to userspace. */
2754 if (slot >= rdev->mddev->raid_disks &&
2755 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
2757 rdev->raid_disk = slot;
2758 /* assume it is working */
2759 clear_bit(Faulty, &rdev->flags);
2760 clear_bit(WriteMostly, &rdev->flags);
2761 set_bit(In_sync, &rdev->flags);
2762 sysfs_notify_dirent_safe(rdev->sysfs_state);
2767 static struct rdev_sysfs_entry rdev_slot =
2768 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
2771 offset_show(struct md_rdev *rdev, char *page)
2773 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
2777 offset_store(struct md_rdev *rdev, const char *buf, size_t len)
2779 unsigned long long offset;
2780 if (kstrtoull(buf, 10, &offset) < 0)
2782 if (rdev->mddev->pers && rdev->raid_disk >= 0)
2784 if (rdev->sectors && rdev->mddev->external)
2785 /* Must set offset before size, so overlap checks
2788 rdev->data_offset = offset;
2789 rdev->new_data_offset = offset;
2793 static struct rdev_sysfs_entry rdev_offset =
2794 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
2796 static ssize_t new_offset_show(struct md_rdev *rdev, char *page)
2798 return sprintf(page, "%llu\n",
2799 (unsigned long long)rdev->new_data_offset);
2802 static ssize_t new_offset_store(struct md_rdev *rdev,
2803 const char *buf, size_t len)
2805 unsigned long long new_offset;
2806 struct mddev *mddev = rdev->mddev;
2808 if (kstrtoull(buf, 10, &new_offset) < 0)
2811 if (mddev->sync_thread ||
2812 test_bit(MD_RECOVERY_RUNNING,&mddev->recovery))
2814 if (new_offset == rdev->data_offset)
2815 /* reset is always permitted */
2817 else if (new_offset > rdev->data_offset) {
2818 /* must not push array size beyond rdev_sectors */
2819 if (new_offset - rdev->data_offset
2820 + mddev->dev_sectors > rdev->sectors)
2823 /* Metadata worries about other space details. */
2825 /* decreasing the offset is inconsistent with a backwards
2828 if (new_offset < rdev->data_offset &&
2829 mddev->reshape_backwards)
2831 /* Increasing offset is inconsistent with forwards
2832 * reshape. reshape_direction should be set to
2833 * 'backwards' first.
2835 if (new_offset > rdev->data_offset &&
2836 !mddev->reshape_backwards)
2839 if (mddev->pers && mddev->persistent &&
2840 !super_types[mddev->major_version]
2841 .allow_new_offset(rdev, new_offset))
2843 rdev->new_data_offset = new_offset;
2844 if (new_offset > rdev->data_offset)
2845 mddev->reshape_backwards = 1;
2846 else if (new_offset < rdev->data_offset)
2847 mddev->reshape_backwards = 0;
2851 static struct rdev_sysfs_entry rdev_new_offset =
2852 __ATTR(new_offset, S_IRUGO|S_IWUSR, new_offset_show, new_offset_store);
2855 rdev_size_show(struct md_rdev *rdev, char *page)
2857 return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2);
2860 static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
2862 /* check if two start/length pairs overlap */
2870 static int strict_blocks_to_sectors(const char *buf, sector_t *sectors)
2872 unsigned long long blocks;
2875 if (kstrtoull(buf, 10, &blocks) < 0)
2878 if (blocks & 1ULL << (8 * sizeof(blocks) - 1))
2879 return -EINVAL; /* sector conversion overflow */
2882 if (new != blocks * 2)
2883 return -EINVAL; /* unsigned long long to sector_t overflow */
2890 rdev_size_store(struct md_rdev *rdev, const char *buf, size_t len)
2892 struct mddev *my_mddev = rdev->mddev;
2893 sector_t oldsectors = rdev->sectors;
2896 if (strict_blocks_to_sectors(buf, §ors) < 0)
2898 if (rdev->data_offset != rdev->new_data_offset)
2899 return -EINVAL; /* too confusing */
2900 if (my_mddev->pers && rdev->raid_disk >= 0) {
2901 if (my_mddev->persistent) {
2902 sectors = super_types[my_mddev->major_version].
2903 rdev_size_change(rdev, sectors);
2906 } else if (!sectors)
2907 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) -
2909 if (!my_mddev->pers->resize)
2910 /* Cannot change size for RAID0 or Linear etc */
2913 if (sectors < my_mddev->dev_sectors)
2914 return -EINVAL; /* component must fit device */
2916 rdev->sectors = sectors;
2917 if (sectors > oldsectors && my_mddev->external) {
2918 /* Need to check that all other rdevs with the same
2919 * ->bdev do not overlap. 'rcu' is sufficient to walk
2920 * the rdev lists safely.
2921 * This check does not provide a hard guarantee, it
2922 * just helps avoid dangerous mistakes.
2924 struct mddev *mddev;
2926 struct list_head *tmp;
2929 for_each_mddev(mddev, tmp) {
2930 struct md_rdev *rdev2;
2932 rdev_for_each(rdev2, mddev)
2933 if (rdev->bdev == rdev2->bdev &&
2935 overlaps(rdev->data_offset, rdev->sectors,
2948 /* Someone else could have slipped in a size
2949 * change here, but doing so is just silly.
2950 * We put oldsectors back because we *know* it is
2951 * safe, and trust userspace not to race with
2954 rdev->sectors = oldsectors;
2961 static struct rdev_sysfs_entry rdev_size =
2962 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
2964 static ssize_t recovery_start_show(struct md_rdev *rdev, char *page)
2966 unsigned long long recovery_start = rdev->recovery_offset;
2968 if (test_bit(In_sync, &rdev->flags) ||
2969 recovery_start == MaxSector)
2970 return sprintf(page, "none\n");
2972 return sprintf(page, "%llu\n", recovery_start);
2975 static ssize_t recovery_start_store(struct md_rdev *rdev, const char *buf, size_t len)
2977 unsigned long long recovery_start;
2979 if (cmd_match(buf, "none"))
2980 recovery_start = MaxSector;
2981 else if (kstrtoull(buf, 10, &recovery_start))
2984 if (rdev->mddev->pers &&
2985 rdev->raid_disk >= 0)
2988 rdev->recovery_offset = recovery_start;
2989 if (recovery_start == MaxSector)
2990 set_bit(In_sync, &rdev->flags);
2992 clear_bit(In_sync, &rdev->flags);
2996 static struct rdev_sysfs_entry rdev_recovery_start =
2997 __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store);
3000 badblocks_show(struct badblocks *bb, char *page, int unack);
3002 badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack);
3004 static ssize_t bb_show(struct md_rdev *rdev, char *page)
3006 return badblocks_show(&rdev->badblocks, page, 0);
3008 static ssize_t bb_store(struct md_rdev *rdev, const char *page, size_t len)
3010 int rv = badblocks_store(&rdev->badblocks, page, len, 0);
3011 /* Maybe that ack was all we needed */
3012 if (test_and_clear_bit(BlockedBadBlocks, &rdev->flags))
3013 wake_up(&rdev->blocked_wait);
3016 static struct rdev_sysfs_entry rdev_bad_blocks =
3017 __ATTR(bad_blocks, S_IRUGO|S_IWUSR, bb_show, bb_store);
3019 static ssize_t ubb_show(struct md_rdev *rdev, char *page)
3021 return badblocks_show(&rdev->badblocks, page, 1);
3023 static ssize_t ubb_store(struct md_rdev *rdev, const char *page, size_t len)
3025 return badblocks_store(&rdev->badblocks, page, len, 1);
3027 static struct rdev_sysfs_entry rdev_unack_bad_blocks =
3028 __ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store);
3030 static struct attribute *rdev_default_attrs[] = {
3035 &rdev_new_offset.attr,
3037 &rdev_recovery_start.attr,
3038 &rdev_bad_blocks.attr,
3039 &rdev_unack_bad_blocks.attr,
3043 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
3045 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3046 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3052 return entry->show(rdev, page);
3056 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
3057 const char *page, size_t length)
3059 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3060 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3062 struct mddev *mddev = rdev->mddev;
3066 if (!capable(CAP_SYS_ADMIN))
3068 rv = mddev ? mddev_lock(mddev): -EBUSY;
3070 if (rdev->mddev == NULL)
3073 rv = entry->store(rdev, page, length);
3074 mddev_unlock(mddev);
3079 static void rdev_free(struct kobject *ko)
3081 struct md_rdev *rdev = container_of(ko, struct md_rdev, kobj);
3084 static const struct sysfs_ops rdev_sysfs_ops = {
3085 .show = rdev_attr_show,
3086 .store = rdev_attr_store,
3088 static struct kobj_type rdev_ktype = {
3089 .release = rdev_free,
3090 .sysfs_ops = &rdev_sysfs_ops,
3091 .default_attrs = rdev_default_attrs,
3094 int md_rdev_init(struct md_rdev *rdev)
3097 rdev->saved_raid_disk = -1;
3098 rdev->raid_disk = -1;
3100 rdev->data_offset = 0;
3101 rdev->new_data_offset = 0;
3102 rdev->sb_events = 0;
3103 rdev->last_read_error.tv_sec = 0;
3104 rdev->last_read_error.tv_nsec = 0;
3105 rdev->sb_loaded = 0;
3106 rdev->bb_page = NULL;
3107 atomic_set(&rdev->nr_pending, 0);
3108 atomic_set(&rdev->read_errors, 0);
3109 atomic_set(&rdev->corrected_errors, 0);
3111 INIT_LIST_HEAD(&rdev->same_set);
3112 init_waitqueue_head(&rdev->blocked_wait);
3114 /* Add space to store bad block list.
3115 * This reserves the space even on arrays where it cannot
3116 * be used - I wonder if that matters
3118 rdev->badblocks.count = 0;
3119 rdev->badblocks.shift = -1; /* disabled until explicitly enabled */
3120 rdev->badblocks.page = kmalloc(PAGE_SIZE, GFP_KERNEL);
3121 seqlock_init(&rdev->badblocks.lock);
3122 if (rdev->badblocks.page == NULL)
3127 EXPORT_SYMBOL_GPL(md_rdev_init);
3129 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3131 * mark the device faulty if:
3133 * - the device is nonexistent (zero size)
3134 * - the device has no valid superblock
3136 * a faulty rdev _never_ has rdev->sb set.
3138 static struct md_rdev *md_import_device(dev_t newdev, int super_format, int super_minor)
3140 char b[BDEVNAME_SIZE];
3142 struct md_rdev *rdev;
3145 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
3147 printk(KERN_ERR "md: could not alloc mem for new device!\n");
3148 return ERR_PTR(-ENOMEM);
3151 err = md_rdev_init(rdev);
3154 err = alloc_disk_sb(rdev);
3158 err = lock_rdev(rdev, newdev, super_format == -2);
3162 kobject_init(&rdev->kobj, &rdev_ktype);
3164 size = i_size_read(rdev->bdev->bd_inode) >> BLOCK_SIZE_BITS;
3167 "md: %s has zero or unknown size, marking faulty!\n",
3168 bdevname(rdev->bdev,b));
3173 if (super_format >= 0) {
3174 err = super_types[super_format].
3175 load_super(rdev, NULL, super_minor);
3176 if (err == -EINVAL) {
3178 "md: %s does not have a valid v%d.%d "
3179 "superblock, not importing!\n",
3180 bdevname(rdev->bdev,b),
3181 super_format, super_minor);
3186 "md: could not read %s's sb, not importing!\n",
3187 bdevname(rdev->bdev,b));
3197 md_rdev_clear(rdev);
3199 return ERR_PTR(err);
3203 * Check a full RAID array for plausibility
3206 static void analyze_sbs(struct mddev *mddev)
3209 struct md_rdev *rdev, *freshest, *tmp;
3210 char b[BDEVNAME_SIZE];
3213 rdev_for_each_safe(rdev, tmp, mddev)
3214 switch (super_types[mddev->major_version].
3215 load_super(rdev, freshest, mddev->minor_version)) {
3223 "md: fatal superblock inconsistency in %s"
3224 " -- removing from array\n",
3225 bdevname(rdev->bdev,b));
3226 md_kick_rdev_from_array(rdev);
3229 super_types[mddev->major_version].
3230 validate_super(mddev, freshest);
3233 rdev_for_each_safe(rdev, tmp, mddev) {
3234 if (mddev->max_disks &&
3235 (rdev->desc_nr >= mddev->max_disks ||
3236 i > mddev->max_disks)) {
3238 "md: %s: %s: only %d devices permitted\n",
3239 mdname(mddev), bdevname(rdev->bdev, b),
3241 md_kick_rdev_from_array(rdev);
3244 if (rdev != freshest) {
3245 if (super_types[mddev->major_version].
3246 validate_super(mddev, rdev)) {
3247 printk(KERN_WARNING "md: kicking non-fresh %s"
3249 bdevname(rdev->bdev,b));
3250 md_kick_rdev_from_array(rdev);
3254 if (mddev->level == LEVEL_MULTIPATH) {
3255 rdev->desc_nr = i++;
3256 rdev->raid_disk = rdev->desc_nr;
3257 set_bit(In_sync, &rdev->flags);
3258 } else if (rdev->raid_disk >= (mddev->raid_disks - min(0, mddev->delta_disks))) {
3259 rdev->raid_disk = -1;
3260 clear_bit(In_sync, &rdev->flags);
3265 /* Read a fixed-point number.
3266 * Numbers in sysfs attributes should be in "standard" units where
3267 * possible, so time should be in seconds.
3268 * However we internally use a a much smaller unit such as
3269 * milliseconds or jiffies.
3270 * This function takes a decimal number with a possible fractional
3271 * component, and produces an integer which is the result of
3272 * multiplying that number by 10^'scale'.
3273 * all without any floating-point arithmetic.
3275 int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale)
3277 unsigned long result = 0;
3279 while (isdigit(*cp) || (*cp == '.' && decimals < 0)) {
3282 else if (decimals < scale) {
3285 result = result * 10 + value;
3297 while (decimals < scale) {
3306 safe_delay_show(struct mddev *mddev, char *page)
3308 int msec = (mddev->safemode_delay*1000)/HZ;
3309 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
3312 safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len)
3316 if (mddev_is_clustered(mddev)) {
3317 pr_info("md: Safemode is disabled for clustered mode\n");
3321 if (strict_strtoul_scaled(cbuf, &msec, 3) < 0)
3324 mddev->safemode_delay = 0;
3326 unsigned long old_delay = mddev->safemode_delay;
3327 unsigned long new_delay = (msec*HZ)/1000;
3331 mddev->safemode_delay = new_delay;
3332 if (new_delay < old_delay || old_delay == 0)
3333 mod_timer(&mddev->safemode_timer, jiffies+1);
3337 static struct md_sysfs_entry md_safe_delay =
3338 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
3341 level_show(struct mddev *mddev, char *page)
3343 struct md_personality *p;
3345 spin_lock(&mddev->lock);
3348 ret = sprintf(page, "%s\n", p->name);
3349 else if (mddev->clevel[0])
3350 ret = sprintf(page, "%s\n", mddev->clevel);
3351 else if (mddev->level != LEVEL_NONE)
3352 ret = sprintf(page, "%d\n", mddev->level);
3355 spin_unlock(&mddev->lock);
3360 level_store(struct mddev *mddev, const char *buf, size_t len)
3365 struct md_personality *pers, *oldpers;
3367 void *priv, *oldpriv;
3368 struct md_rdev *rdev;
3370 if (slen == 0 || slen >= sizeof(clevel))
3373 rv = mddev_lock(mddev);
3377 if (mddev->pers == NULL) {
3378 strncpy(mddev->clevel, buf, slen);
3379 if (mddev->clevel[slen-1] == '\n')
3381 mddev->clevel[slen] = 0;
3382 mddev->level = LEVEL_NONE;
3390 /* request to change the personality. Need to ensure:
3391 * - array is not engaged in resync/recovery/reshape
3392 * - old personality can be suspended
3393 * - new personality will access other array.
3397 if (mddev->sync_thread ||
3398 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3399 mddev->reshape_position != MaxSector ||
3400 mddev->sysfs_active)
3404 if (!mddev->pers->quiesce) {
3405 printk(KERN_WARNING "md: %s: %s does not support online personality change\n",
3406 mdname(mddev), mddev->pers->name);
3410 /* Now find the new personality */
3411 strncpy(clevel, buf, slen);
3412 if (clevel[slen-1] == '\n')
3415 if (kstrtol(clevel, 10, &level))
3418 if (request_module("md-%s", clevel) != 0)
3419 request_module("md-level-%s", clevel);
3420 spin_lock(&pers_lock);
3421 pers = find_pers(level, clevel);
3422 if (!pers || !try_module_get(pers->owner)) {
3423 spin_unlock(&pers_lock);
3424 printk(KERN_WARNING "md: personality %s not loaded\n", clevel);
3428 spin_unlock(&pers_lock);
3430 if (pers == mddev->pers) {
3431 /* Nothing to do! */
3432 module_put(pers->owner);
3436 if (!pers->takeover) {
3437 module_put(pers->owner);
3438 printk(KERN_WARNING "md: %s: %s does not support personality takeover\n",
3439 mdname(mddev), clevel);
3444 rdev_for_each(rdev, mddev)
3445 rdev->new_raid_disk = rdev->raid_disk;
3447 /* ->takeover must set new_* and/or delta_disks
3448 * if it succeeds, and may set them when it fails.
3450 priv = pers->takeover(mddev);
3452 mddev->new_level = mddev->level;
3453 mddev->new_layout = mddev->layout;
3454 mddev->new_chunk_sectors = mddev->chunk_sectors;
3455 mddev->raid_disks -= mddev->delta_disks;
3456 mddev->delta_disks = 0;
3457 mddev->reshape_backwards = 0;
3458 module_put(pers->owner);
3459 printk(KERN_WARNING "md: %s: %s would not accept array\n",
3460 mdname(mddev), clevel);
3465 /* Looks like we have a winner */
3466 mddev_suspend(mddev);
3467 mddev_detach(mddev);
3469 spin_lock(&mddev->lock);
3470 oldpers = mddev->pers;
3471 oldpriv = mddev->private;
3473 mddev->private = priv;
3474 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
3475 mddev->level = mddev->new_level;
3476 mddev->layout = mddev->new_layout;
3477 mddev->chunk_sectors = mddev->new_chunk_sectors;
3478 mddev->delta_disks = 0;
3479 mddev->reshape_backwards = 0;
3480 mddev->degraded = 0;
3481 spin_unlock(&mddev->lock);
3483 if (oldpers->sync_request == NULL &&
3485 /* We are converting from a no-redundancy array
3486 * to a redundancy array and metadata is managed
3487 * externally so we need to be sure that writes
3488 * won't block due to a need to transition
3490 * until external management is started.
3493 mddev->safemode_delay = 0;
3494 mddev->safemode = 0;
3497 oldpers->free(mddev, oldpriv);
3499 if (oldpers->sync_request == NULL &&
3500 pers->sync_request != NULL) {
3501 /* need to add the md_redundancy_group */
3502 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
3504 "md: cannot register extra attributes for %s\n",
3506 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action");
3508 if (oldpers->sync_request != NULL &&
3509 pers->sync_request == NULL) {
3510 /* need to remove the md_redundancy_group */
3511 if (mddev->to_remove == NULL)
3512 mddev->to_remove = &md_redundancy_group;
3515 rdev_for_each(rdev, mddev) {
3516 if (rdev->raid_disk < 0)
3518 if (rdev->new_raid_disk >= mddev->raid_disks)
3519 rdev->new_raid_disk = -1;
3520 if (rdev->new_raid_disk == rdev->raid_disk)
3522 sysfs_unlink_rdev(mddev, rdev);
3524 rdev_for_each(rdev, mddev) {
3525 if (rdev->raid_disk < 0)
3527 if (rdev->new_raid_disk == rdev->raid_disk)
3529 rdev->raid_disk = rdev->new_raid_disk;
3530 if (rdev->raid_disk < 0)
3531 clear_bit(In_sync, &rdev->flags);
3533 if (sysfs_link_rdev(mddev, rdev))
3534 printk(KERN_WARNING "md: cannot register rd%d"
3535 " for %s after level change\n",
3536 rdev->raid_disk, mdname(mddev));
3540 if (pers->sync_request == NULL) {
3541 /* this is now an array without redundancy, so
3542 * it must always be in_sync
3545 del_timer_sync(&mddev->safemode_timer);
3547 blk_set_stacking_limits(&mddev->queue->limits);
3549 set_bit(MD_CHANGE_DEVS, &mddev->flags);
3550 mddev_resume(mddev);
3552 md_update_sb(mddev, 1);
3553 sysfs_notify(&mddev->kobj, NULL, "level");
3554 md_new_event(mddev);
3557 mddev_unlock(mddev);
3561 static struct md_sysfs_entry md_level =
3562 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
3565 layout_show(struct mddev *mddev, char *page)
3567 /* just a number, not meaningful for all levels */
3568 if (mddev->reshape_position != MaxSector &&
3569 mddev->layout != mddev->new_layout)
3570 return sprintf(page, "%d (%d)\n",
3571 mddev->new_layout, mddev->layout);
3572 return sprintf(page, "%d\n", mddev->layout);
3576 layout_store(struct mddev *mddev, const char *buf, size_t len)
3581 err = kstrtouint(buf, 10, &n);
3584 err = mddev_lock(mddev);
3589 if (mddev->pers->check_reshape == NULL)
3594 mddev->new_layout = n;
3595 err = mddev->pers->check_reshape(mddev);
3597 mddev->new_layout = mddev->layout;
3600 mddev->new_layout = n;
3601 if (mddev->reshape_position == MaxSector)
3604 mddev_unlock(mddev);
3607 static struct md_sysfs_entry md_layout =
3608 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
3611 raid_disks_show(struct mddev *mddev, char *page)
3613 if (mddev->raid_disks == 0)
3615 if (mddev->reshape_position != MaxSector &&
3616 mddev->delta_disks != 0)
3617 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
3618 mddev->raid_disks - mddev->delta_disks);
3619 return sprintf(page, "%d\n", mddev->raid_disks);
3622 static int update_raid_disks(struct mddev *mddev, int raid_disks);
3625 raid_disks_store(struct mddev *mddev, const char *buf, size_t len)
3630 err = kstrtouint(buf, 10, &n);
3634 err = mddev_lock(mddev);
3638 err = update_raid_disks(mddev, n);
3639 else if (mddev->reshape_position != MaxSector) {
3640 struct md_rdev *rdev;
3641 int olddisks = mddev->raid_disks - mddev->delta_disks;
3644 rdev_for_each(rdev, mddev) {
3646 rdev->data_offset < rdev->new_data_offset)
3649 rdev->data_offset > rdev->new_data_offset)
3653 mddev->delta_disks = n - olddisks;
3654 mddev->raid_disks = n;
3655 mddev->reshape_backwards = (mddev->delta_disks < 0);
3657 mddev->raid_disks = n;
3659 mddev_unlock(mddev);
3660 return err ? err : len;
3662 static struct md_sysfs_entry md_raid_disks =
3663 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
3666 chunk_size_show(struct mddev *mddev, char *page)
3668 if (mddev->reshape_position != MaxSector &&
3669 mddev->chunk_sectors != mddev->new_chunk_sectors)
3670 return sprintf(page, "%d (%d)\n",
3671 mddev->new_chunk_sectors << 9,
3672 mddev->chunk_sectors << 9);
3673 return sprintf(page, "%d\n", mddev->chunk_sectors << 9);
3677 chunk_size_store(struct mddev *mddev, const char *buf, size_t len)
3682 err = kstrtoul(buf, 10, &n);
3686 err = mddev_lock(mddev);
3690 if (mddev->pers->check_reshape == NULL)
3695 mddev->new_chunk_sectors = n >> 9;
3696 err = mddev->pers->check_reshape(mddev);
3698 mddev->new_chunk_sectors = mddev->chunk_sectors;
3701 mddev->new_chunk_sectors = n >> 9;
3702 if (mddev->reshape_position == MaxSector)
3703 mddev->chunk_sectors = n >> 9;
3705 mddev_unlock(mddev);
3708 static struct md_sysfs_entry md_chunk_size =
3709 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
3712 resync_start_show(struct mddev *mddev, char *page)
3714 if (mddev->recovery_cp == MaxSector)
3715 return sprintf(page, "none\n");
3716 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
3720 resync_start_store(struct mddev *mddev, const char *buf, size_t len)
3722 unsigned long long n;
3725 if (cmd_match(buf, "none"))
3728 err = kstrtoull(buf, 10, &n);
3731 if (n != (sector_t)n)
3735 err = mddev_lock(mddev);
3738 if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
3742 mddev->recovery_cp = n;
3744 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
3746 mddev_unlock(mddev);
3749 static struct md_sysfs_entry md_resync_start =
3750 __ATTR_PREALLOC(resync_start, S_IRUGO|S_IWUSR,
3751 resync_start_show, resync_start_store);
3754 * The array state can be:
3757 * No devices, no size, no level
3758 * Equivalent to STOP_ARRAY ioctl
3760 * May have some settings, but array is not active
3761 * all IO results in error
3762 * When written, doesn't tear down array, but just stops it
3763 * suspended (not supported yet)
3764 * All IO requests will block. The array can be reconfigured.
3765 * Writing this, if accepted, will block until array is quiescent
3767 * no resync can happen. no superblocks get written.
3768 * write requests fail
3770 * like readonly, but behaves like 'clean' on a write request.
3772 * clean - no pending writes, but otherwise active.
3773 * When written to inactive array, starts without resync
3774 * If a write request arrives then
3775 * if metadata is known, mark 'dirty' and switch to 'active'.
3776 * if not known, block and switch to write-pending
3777 * If written to an active array that has pending writes, then fails.
3779 * fully active: IO and resync can be happening.
3780 * When written to inactive array, starts with resync
3783 * clean, but writes are blocked waiting for 'active' to be written.
3786 * like active, but no writes have been seen for a while (100msec).
3789 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
3790 write_pending, active_idle, bad_word};
3791 static char *array_states[] = {
3792 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3793 "write-pending", "active-idle", NULL };
3795 static int match_word(const char *word, char **list)
3798 for (n=0; list[n]; n++)
3799 if (cmd_match(word, list[n]))
3805 array_state_show(struct mddev *mddev, char *page)
3807 enum array_state st = inactive;
3820 else if (test_bit(MD_CHANGE_PENDING, &mddev->flags))
3822 else if (mddev->safemode)
3828 if (list_empty(&mddev->disks) &&
3829 mddev->raid_disks == 0 &&
3830 mddev->dev_sectors == 0)
3835 return sprintf(page, "%s\n", array_states[st]);
3838 static int do_md_stop(struct mddev *mddev, int ro, struct block_device *bdev);
3839 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev);
3840 static int do_md_run(struct mddev *mddev);
3841 static int restart_array(struct mddev *mddev);
3844 array_state_store(struct mddev *mddev, const char *buf, size_t len)
3847 enum array_state st = match_word(buf, array_states);
3849 if (mddev->pers && (st == active || st == clean) && mddev->ro != 1) {
3850 /* don't take reconfig_mutex when toggling between
3853 spin_lock(&mddev->lock);
3855 restart_array(mddev);
3856 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
3857 wake_up(&mddev->sb_wait);
3859 } else /* st == clean */ {
3860 restart_array(mddev);
3861 if (atomic_read(&mddev->writes_pending) == 0) {
3862 if (mddev->in_sync == 0) {
3864 if (mddev->safemode == 1)
3865 mddev->safemode = 0;
3866 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
3872 spin_unlock(&mddev->lock);
3875 err = mddev_lock(mddev);
3883 /* stopping an active array */
3884 err = do_md_stop(mddev, 0, NULL);
3887 /* stopping an active array */
3889 err = do_md_stop(mddev, 2, NULL);
3891 err = 0; /* already inactive */
3894 break; /* not supported yet */
3897 err = md_set_readonly(mddev, NULL);
3900 set_disk_ro(mddev->gendisk, 1);
3901 err = do_md_run(mddev);
3907 err = md_set_readonly(mddev, NULL);
3908 else if (mddev->ro == 1)
3909 err = restart_array(mddev);
3912 set_disk_ro(mddev->gendisk, 0);
3916 err = do_md_run(mddev);
3921 restart_array(mddev);
3922 spin_lock(&mddev->lock);
3923 if (atomic_read(&mddev->writes_pending) == 0) {
3924 if (mddev->in_sync == 0) {
3926 if (mddev->safemode == 1)
3927 mddev->safemode = 0;
3928 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
3933 spin_unlock(&mddev->lock);
3939 restart_array(mddev);
3940 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
3941 wake_up(&mddev->sb_wait);
3945 set_disk_ro(mddev->gendisk, 0);
3946 err = do_md_run(mddev);
3951 /* these cannot be set */
3956 if (mddev->hold_active == UNTIL_IOCTL)
3957 mddev->hold_active = 0;
3958 sysfs_notify_dirent_safe(mddev->sysfs_state);
3960 mddev_unlock(mddev);
3963 static struct md_sysfs_entry md_array_state =
3964 __ATTR_PREALLOC(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
3967 max_corrected_read_errors_show(struct mddev *mddev, char *page) {
3968 return sprintf(page, "%d\n",
3969 atomic_read(&mddev->max_corr_read_errors));
3973 max_corrected_read_errors_store(struct mddev *mddev, const char *buf, size_t len)
3978 rv = kstrtouint(buf, 10, &n);
3981 atomic_set(&mddev->max_corr_read_errors, n);
3985 static struct md_sysfs_entry max_corr_read_errors =
3986 __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show,
3987 max_corrected_read_errors_store);
3990 null_show(struct mddev *mddev, char *page)
3996 new_dev_store(struct mddev *mddev, const char *buf, size_t len)
3998 /* buf must be %d:%d\n? giving major and minor numbers */
3999 /* The new device is added to the array.
4000 * If the array has a persistent superblock, we read the
4001 * superblock to initialise info and check validity.
4002 * Otherwise, only checking done is that in bind_rdev_to_array,
4003 * which mainly checks size.
4006 int major = simple_strtoul(buf, &e, 10);
4009 struct md_rdev *rdev;
4012 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
4014 minor = simple_strtoul(e+1, &e, 10);
4015 if (*e && *e != '\n')
4017 dev = MKDEV(major, minor);
4018 if (major != MAJOR(dev) ||
4019 minor != MINOR(dev))
4022 flush_workqueue(md_misc_wq);
4024 err = mddev_lock(mddev);
4027 if (mddev->persistent) {
4028 rdev = md_import_device(dev, mddev->major_version,
4029 mddev->minor_version);
4030 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
4031 struct md_rdev *rdev0
4032 = list_entry(mddev->disks.next,
4033 struct md_rdev, same_set);
4034 err = super_types[mddev->major_version]
4035 .load_super(rdev, rdev0, mddev->minor_version);
4039 } else if (mddev->external)
4040 rdev = md_import_device(dev, -2, -1);
4042 rdev = md_import_device(dev, -1, -1);
4045 mddev_unlock(mddev);
4046 return PTR_ERR(rdev);
4048 err = bind_rdev_to_array(rdev, mddev);
4052 mddev_unlock(mddev);
4053 return err ? err : len;
4056 static struct md_sysfs_entry md_new_device =
4057 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
4060 bitmap_store(struct mddev *mddev, const char *buf, size_t len)
4063 unsigned long chunk, end_chunk;
4066 err = mddev_lock(mddev);
4071 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
4073 chunk = end_chunk = simple_strtoul(buf, &end, 0);
4074 if (buf == end) break;
4075 if (*end == '-') { /* range */
4077 end_chunk = simple_strtoul(buf, &end, 0);
4078 if (buf == end) break;
4080 if (*end && !isspace(*end)) break;
4081 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
4082 buf = skip_spaces(end);
4084 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
4086 mddev_unlock(mddev);
4090 static struct md_sysfs_entry md_bitmap =
4091 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
4094 size_show(struct mddev *mddev, char *page)
4096 return sprintf(page, "%llu\n",
4097 (unsigned long long)mddev->dev_sectors / 2);
4100 static int update_size(struct mddev *mddev, sector_t num_sectors);
4103 size_store(struct mddev *mddev, const char *buf, size_t len)
4105 /* If array is inactive, we can reduce the component size, but
4106 * not increase it (except from 0).
4107 * If array is active, we can try an on-line resize
4110 int err = strict_blocks_to_sectors(buf, §ors);
4114 err = mddev_lock(mddev);
4118 err = update_size(mddev, sectors);
4119 md_update_sb(mddev, 1);
4121 if (mddev->dev_sectors == 0 ||
4122 mddev->dev_sectors > sectors)
4123 mddev->dev_sectors = sectors;
4127 mddev_unlock(mddev);
4128 return err ? err : len;
4131 static struct md_sysfs_entry md_size =
4132 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
4134 /* Metadata version.
4136 * 'none' for arrays with no metadata (good luck...)
4137 * 'external' for arrays with externally managed metadata,
4138 * or N.M for internally known formats
4141 metadata_show(struct mddev *mddev, char *page)
4143 if (mddev->persistent)
4144 return sprintf(page, "%d.%d\n",
4145 mddev->major_version, mddev->minor_version);
4146 else if (mddev->external)
4147 return sprintf(page, "external:%s\n", mddev->metadata_type);
4149 return sprintf(page, "none\n");
4153 metadata_store(struct mddev *mddev, const char *buf, size_t len)
4158 /* Changing the details of 'external' metadata is
4159 * always permitted. Otherwise there must be
4160 * no devices attached to the array.
4163 err = mddev_lock(mddev);
4167 if (mddev->external && strncmp(buf, "external:", 9) == 0)
4169 else if (!list_empty(&mddev->disks))
4173 if (cmd_match(buf, "none")) {
4174 mddev->persistent = 0;
4175 mddev->external = 0;
4176 mddev->major_version = 0;
4177 mddev->minor_version = 90;
4180 if (strncmp(buf, "external:", 9) == 0) {
4181 size_t namelen = len-9;
4182 if (namelen >= sizeof(mddev->metadata_type))
4183 namelen = sizeof(mddev->metadata_type)-1;
4184 strncpy(mddev->metadata_type, buf+9, namelen);
4185 mddev->metadata_type[namelen] = 0;
4186 if (namelen && mddev->metadata_type[namelen-1] == '\n')
4187 mddev->metadata_type[--namelen] = 0;
4188 mddev->persistent = 0;
4189 mddev->external = 1;
4190 mddev->major_version = 0;
4191 mddev->minor_version = 90;
4194 major = simple_strtoul(buf, &e, 10);
4196 if (e==buf || *e != '.')
4199 minor = simple_strtoul(buf, &e, 10);
4200 if (e==buf || (*e && *e != '\n') )
4203 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
4205 mddev->major_version = major;
4206 mddev->minor_version = minor;
4207 mddev->persistent = 1;
4208 mddev->external = 0;
4211 mddev_unlock(mddev);
4215 static struct md_sysfs_entry md_metadata =
4216 __ATTR_PREALLOC(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
4219 action_show(struct mddev *mddev, char *page)
4221 char *type = "idle";
4222 unsigned long recovery = mddev->recovery;
4223 if (test_bit(MD_RECOVERY_FROZEN, &recovery))
4225 else if (test_bit(MD_RECOVERY_RUNNING, &recovery) ||
4226 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &recovery))) {
4227 if (test_bit(MD_RECOVERY_RESHAPE, &recovery))
4229 else if (test_bit(MD_RECOVERY_SYNC, &recovery)) {
4230 if (!test_bit(MD_RECOVERY_REQUESTED, &recovery))
4232 else if (test_bit(MD_RECOVERY_CHECK, &recovery))
4236 } else if (test_bit(MD_RECOVERY_RECOVER, &recovery))
4238 else if (mddev->reshape_position != MaxSector)
4241 return sprintf(page, "%s\n", type);
4245 action_store(struct mddev *mddev, const char *page, size_t len)
4247 if (!mddev->pers || !mddev->pers->sync_request)
4251 if (cmd_match(page, "idle") || cmd_match(page, "frozen")) {
4252 if (cmd_match(page, "frozen"))
4253 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4255 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4256 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
4257 mddev_lock(mddev) == 0) {
4258 flush_workqueue(md_misc_wq);
4259 if (mddev->sync_thread) {
4260 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4261 md_reap_sync_thread(mddev);
4263 mddev_unlock(mddev);
4265 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
4266 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
4268 else if (cmd_match(page, "resync"))
4269 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4270 else if (cmd_match(page, "recover")) {
4271 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4272 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
4273 } else if (cmd_match(page, "reshape")) {
4275 if (mddev->pers->start_reshape == NULL)
4277 err = mddev_lock(mddev);
4279 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4280 err = mddev->pers->start_reshape(mddev);
4281 mddev_unlock(mddev);
4285 sysfs_notify(&mddev->kobj, NULL, "degraded");
4287 if (cmd_match(page, "check"))
4288 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
4289 else if (!cmd_match(page, "repair"))
4291 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4292 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
4293 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
4295 if (mddev->ro == 2) {
4296 /* A write to sync_action is enough to justify
4297 * canceling read-auto mode
4300 md_wakeup_thread(mddev->sync_thread);
4302 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4303 md_wakeup_thread(mddev->thread);
4304 sysfs_notify_dirent_safe(mddev->sysfs_action);
4308 static struct md_sysfs_entry md_scan_mode =
4309 __ATTR_PREALLOC(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
4312 last_sync_action_show(struct mddev *mddev, char *page)
4314 return sprintf(page, "%s\n", mddev->last_sync_action);
4317 static struct md_sysfs_entry md_last_scan_mode = __ATTR_RO(last_sync_action);
4320 mismatch_cnt_show(struct mddev *mddev, char *page)
4322 return sprintf(page, "%llu\n",
4323 (unsigned long long)
4324 atomic64_read(&mddev->resync_mismatches));
4327 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
4330 sync_min_show(struct mddev *mddev, char *page)
4332 return sprintf(page, "%d (%s)\n", speed_min(mddev),
4333 mddev->sync_speed_min ? "local": "system");
4337 sync_min_store(struct mddev *mddev, const char *buf, size_t len)
4342 if (strncmp(buf, "system", 6)==0) {
4345 rv = kstrtouint(buf, 10, &min);
4351 mddev->sync_speed_min = min;
4355 static struct md_sysfs_entry md_sync_min =
4356 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
4359 sync_max_show(struct mddev *mddev, char *page)
4361 return sprintf(page, "%d (%s)\n", speed_max(mddev),
4362 mddev->sync_speed_max ? "local": "system");
4366 sync_max_store(struct mddev *mddev, const char *buf, size_t len)
4371 if (strncmp(buf, "system", 6)==0) {
4374 rv = kstrtouint(buf, 10, &max);
4380 mddev->sync_speed_max = max;
4384 static struct md_sysfs_entry md_sync_max =
4385 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
4388 degraded_show(struct mddev *mddev, char *page)
4390 return sprintf(page, "%d\n", mddev->degraded);
4392 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
4395 sync_force_parallel_show(struct mddev *mddev, char *page)
4397 return sprintf(page, "%d\n", mddev->parallel_resync);
4401 sync_force_parallel_store(struct mddev *mddev, const char *buf, size_t len)
4405 if (kstrtol(buf, 10, &n))
4408 if (n != 0 && n != 1)
4411 mddev->parallel_resync = n;
4413 if (mddev->sync_thread)
4414 wake_up(&resync_wait);
4419 /* force parallel resync, even with shared block devices */
4420 static struct md_sysfs_entry md_sync_force_parallel =
4421 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
4422 sync_force_parallel_show, sync_force_parallel_store);
4425 sync_speed_show(struct mddev *mddev, char *page)
4427 unsigned long resync, dt, db;
4428 if (mddev->curr_resync == 0)
4429 return sprintf(page, "none\n");
4430 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
4431 dt = (jiffies - mddev->resync_mark) / HZ;
4433 db = resync - mddev->resync_mark_cnt;
4434 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
4437 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
4440 sync_completed_show(struct mddev *mddev, char *page)
4442 unsigned long long max_sectors, resync;
4444 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4445 return sprintf(page, "none\n");
4447 if (mddev->curr_resync == 1 ||
4448 mddev->curr_resync == 2)
4449 return sprintf(page, "delayed\n");
4451 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
4452 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
4453 max_sectors = mddev->resync_max_sectors;
4455 max_sectors = mddev->dev_sectors;
4457 resync = mddev->curr_resync_completed;
4458 return sprintf(page, "%llu / %llu\n", resync, max_sectors);
4461 static struct md_sysfs_entry md_sync_completed =
4462 __ATTR_PREALLOC(sync_completed, S_IRUGO, sync_completed_show, NULL);
4465 min_sync_show(struct mddev *mddev, char *page)
4467 return sprintf(page, "%llu\n",
4468 (unsigned long long)mddev->resync_min);
4471 min_sync_store(struct mddev *mddev, const char *buf, size_t len)
4473 unsigned long long min;
4476 if (kstrtoull(buf, 10, &min))
4479 spin_lock(&mddev->lock);
4481 if (min > mddev->resync_max)
4485 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4488 /* Round down to multiple of 4K for safety */
4489 mddev->resync_min = round_down(min, 8);
4493 spin_unlock(&mddev->lock);
4497 static struct md_sysfs_entry md_min_sync =
4498 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
4501 max_sync_show(struct mddev *mddev, char *page)
4503 if (mddev->resync_max == MaxSector)
4504 return sprintf(page, "max\n");
4506 return sprintf(page, "%llu\n",
4507 (unsigned long long)mddev->resync_max);
4510 max_sync_store(struct mddev *mddev, const char *buf, size_t len)
4513 spin_lock(&mddev->lock);
4514 if (strncmp(buf, "max", 3) == 0)
4515 mddev->resync_max = MaxSector;
4517 unsigned long long max;
4521 if (kstrtoull(buf, 10, &max))
4523 if (max < mddev->resync_min)
4527 if (max < mddev->resync_max &&
4529 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4532 /* Must be a multiple of chunk_size */
4533 chunk = mddev->chunk_sectors;
4535 sector_t temp = max;
4538 if (sector_div(temp, chunk))
4541 mddev->resync_max = max;
4543 wake_up(&mddev->recovery_wait);
4546 spin_unlock(&mddev->lock);
4550 static struct md_sysfs_entry md_max_sync =
4551 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
4554 suspend_lo_show(struct mddev *mddev, char *page)
4556 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
4560 suspend_lo_store(struct mddev *mddev, const char *buf, size_t len)
4562 unsigned long long old, new;
4565 err = kstrtoull(buf, 10, &new);
4568 if (new != (sector_t)new)
4571 err = mddev_lock(mddev);
4575 if (mddev->pers == NULL ||
4576 mddev->pers->quiesce == NULL)
4578 old = mddev->suspend_lo;
4579 mddev->suspend_lo = new;
4581 /* Shrinking suspended region */
4582 mddev->pers->quiesce(mddev, 2);
4584 /* Expanding suspended region - need to wait */
4585 mddev->pers->quiesce(mddev, 1);
4586 mddev->pers->quiesce(mddev, 0);
4590 mddev_unlock(mddev);
4593 static struct md_sysfs_entry md_suspend_lo =
4594 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
4597 suspend_hi_show(struct mddev *mddev, char *page)
4599 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
4603 suspend_hi_store(struct mddev *mddev, const char *buf, size_t len)
4605 unsigned long long old, new;
4608 err = kstrtoull(buf, 10, &new);
4611 if (new != (sector_t)new)
4614 err = mddev_lock(mddev);
4618 if (mddev->pers == NULL ||
4619 mddev->pers->quiesce == NULL)
4621 old = mddev->suspend_hi;
4622 mddev->suspend_hi = new;
4624 /* Shrinking suspended region */
4625 mddev->pers->quiesce(mddev, 2);
4627 /* Expanding suspended region - need to wait */
4628 mddev->pers->quiesce(mddev, 1);
4629 mddev->pers->quiesce(mddev, 0);
4633 mddev_unlock(mddev);
4636 static struct md_sysfs_entry md_suspend_hi =
4637 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
4640 reshape_position_show(struct mddev *mddev, char *page)
4642 if (mddev->reshape_position != MaxSector)
4643 return sprintf(page, "%llu\n",
4644 (unsigned long long)mddev->reshape_position);
4645 strcpy(page, "none\n");
4650 reshape_position_store(struct mddev *mddev, const char *buf, size_t len)
4652 struct md_rdev *rdev;
4653 unsigned long long new;
4656 err = kstrtoull(buf, 10, &new);
4659 if (new != (sector_t)new)
4661 err = mddev_lock(mddev);
4667 mddev->reshape_position = new;
4668 mddev->delta_disks = 0;
4669 mddev->reshape_backwards = 0;
4670 mddev->new_level = mddev->level;
4671 mddev->new_layout = mddev->layout;
4672 mddev->new_chunk_sectors = mddev->chunk_sectors;
4673 rdev_for_each(rdev, mddev)
4674 rdev->new_data_offset = rdev->data_offset;
4677 mddev_unlock(mddev);
4681 static struct md_sysfs_entry md_reshape_position =
4682 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
4683 reshape_position_store);
4686 reshape_direction_show(struct mddev *mddev, char *page)
4688 return sprintf(page, "%s\n",
4689 mddev->reshape_backwards ? "backwards" : "forwards");
4693 reshape_direction_store(struct mddev *mddev, const char *buf, size_t len)
4698 if (cmd_match(buf, "forwards"))
4700 else if (cmd_match(buf, "backwards"))
4704 if (mddev->reshape_backwards == backwards)
4707 err = mddev_lock(mddev);
4710 /* check if we are allowed to change */
4711 if (mddev->delta_disks)
4713 else if (mddev->persistent &&
4714 mddev->major_version == 0)
4717 mddev->reshape_backwards = backwards;
4718 mddev_unlock(mddev);
4722 static struct md_sysfs_entry md_reshape_direction =
4723 __ATTR(reshape_direction, S_IRUGO|S_IWUSR, reshape_direction_show,
4724 reshape_direction_store);
4727 array_size_show(struct mddev *mddev, char *page)
4729 if (mddev->external_size)
4730 return sprintf(page, "%llu\n",
4731 (unsigned long long)mddev->array_sectors/2);
4733 return sprintf(page, "default\n");
4737 array_size_store(struct mddev *mddev, const char *buf, size_t len)
4742 err = mddev_lock(mddev);
4746 if (strncmp(buf, "default", 7) == 0) {
4748 sectors = mddev->pers->size(mddev, 0, 0);
4750 sectors = mddev->array_sectors;
4752 mddev->external_size = 0;
4754 if (strict_blocks_to_sectors(buf, §ors) < 0)
4756 else if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors)
4759 mddev->external_size = 1;
4763 mddev->array_sectors = sectors;
4765 set_capacity(mddev->gendisk, mddev->array_sectors);
4766 revalidate_disk(mddev->gendisk);
4769 mddev_unlock(mddev);
4773 static struct md_sysfs_entry md_array_size =
4774 __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show,
4777 static struct attribute *md_default_attrs[] = {
4780 &md_raid_disks.attr,
4781 &md_chunk_size.attr,
4783 &md_resync_start.attr,
4785 &md_new_device.attr,
4786 &md_safe_delay.attr,
4787 &md_array_state.attr,
4788 &md_reshape_position.attr,
4789 &md_reshape_direction.attr,
4790 &md_array_size.attr,
4791 &max_corr_read_errors.attr,
4795 static struct attribute *md_redundancy_attrs[] = {
4797 &md_last_scan_mode.attr,
4798 &md_mismatches.attr,
4801 &md_sync_speed.attr,
4802 &md_sync_force_parallel.attr,
4803 &md_sync_completed.attr,
4806 &md_suspend_lo.attr,
4807 &md_suspend_hi.attr,
4812 static struct attribute_group md_redundancy_group = {
4814 .attrs = md_redundancy_attrs,
4818 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
4820 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
4821 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
4826 spin_lock(&all_mddevs_lock);
4827 if (list_empty(&mddev->all_mddevs)) {
4828 spin_unlock(&all_mddevs_lock);
4832 spin_unlock(&all_mddevs_lock);
4834 rv = entry->show(mddev, page);
4840 md_attr_store(struct kobject *kobj, struct attribute *attr,
4841 const char *page, size_t length)
4843 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
4844 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
4849 if (!capable(CAP_SYS_ADMIN))
4851 spin_lock(&all_mddevs_lock);
4852 if (list_empty(&mddev->all_mddevs)) {
4853 spin_unlock(&all_mddevs_lock);
4857 spin_unlock(&all_mddevs_lock);
4858 rv = entry->store(mddev, page, length);
4863 static void md_free(struct kobject *ko)
4865 struct mddev *mddev = container_of(ko, struct mddev, kobj);
4867 if (mddev->sysfs_state)
4868 sysfs_put(mddev->sysfs_state);
4871 blk_cleanup_queue(mddev->queue);
4872 if (mddev->gendisk) {
4873 del_gendisk(mddev->gendisk);
4874 put_disk(mddev->gendisk);
4880 static const struct sysfs_ops md_sysfs_ops = {
4881 .show = md_attr_show,
4882 .store = md_attr_store,
4884 static struct kobj_type md_ktype = {
4886 .sysfs_ops = &md_sysfs_ops,
4887 .default_attrs = md_default_attrs,
4892 static void mddev_delayed_delete(struct work_struct *ws)
4894 struct mddev *mddev = container_of(ws, struct mddev, del_work);
4896 sysfs_remove_group(&mddev->kobj, &md_bitmap_group);
4897 kobject_del(&mddev->kobj);
4898 kobject_put(&mddev->kobj);
4901 static int md_alloc(dev_t dev, char *name)
4903 static DEFINE_MUTEX(disks_mutex);
4904 struct mddev *mddev = mddev_find(dev);
4905 struct gendisk *disk;
4914 partitioned = (MAJOR(mddev->unit) != MD_MAJOR);
4915 shift = partitioned ? MdpMinorShift : 0;
4916 unit = MINOR(mddev->unit) >> shift;
4918 /* wait for any previous instance of this device to be
4919 * completely removed (mddev_delayed_delete).
4921 flush_workqueue(md_misc_wq);
4923 mutex_lock(&disks_mutex);
4929 /* Need to ensure that 'name' is not a duplicate.
4931 struct mddev *mddev2;
4932 spin_lock(&all_mddevs_lock);
4934 list_for_each_entry(mddev2, &all_mddevs, all_mddevs)
4935 if (mddev2->gendisk &&
4936 strcmp(mddev2->gendisk->disk_name, name) == 0) {
4937 spin_unlock(&all_mddevs_lock);
4940 spin_unlock(&all_mddevs_lock);
4944 mddev->queue = blk_alloc_queue(GFP_KERNEL);
4947 mddev->queue->queuedata = mddev;
4949 blk_queue_make_request(mddev->queue, md_make_request);
4950 blk_set_stacking_limits(&mddev->queue->limits);
4952 disk = alloc_disk(1 << shift);
4954 blk_cleanup_queue(mddev->queue);
4955 mddev->queue = NULL;
4958 disk->major = MAJOR(mddev->unit);
4959 disk->first_minor = unit << shift;
4961 strcpy(disk->disk_name, name);
4962 else if (partitioned)
4963 sprintf(disk->disk_name, "md_d%d", unit);
4965 sprintf(disk->disk_name, "md%d", unit);
4966 disk->fops = &md_fops;
4967 disk->private_data = mddev;
4968 disk->queue = mddev->queue;
4969 blk_queue_flush(mddev->queue, REQ_FLUSH | REQ_FUA);
4970 /* Allow extended partitions. This makes the
4971 * 'mdp' device redundant, but we can't really
4974 disk->flags |= GENHD_FL_EXT_DEVT;
4975 mddev->gendisk = disk;
4976 /* As soon as we call add_disk(), another thread could get
4977 * through to md_open, so make sure it doesn't get too far
4979 mutex_lock(&mddev->open_mutex);
4982 error = kobject_init_and_add(&mddev->kobj, &md_ktype,
4983 &disk_to_dev(disk)->kobj, "%s", "md");
4985 /* This isn't possible, but as kobject_init_and_add is marked
4986 * __must_check, we must do something with the result
4988 printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
4992 if (mddev->kobj.sd &&
4993 sysfs_create_group(&mddev->kobj, &md_bitmap_group))
4994 printk(KERN_DEBUG "pointless warning\n");
4995 mutex_unlock(&mddev->open_mutex);
4997 mutex_unlock(&disks_mutex);
4998 if (!error && mddev->kobj.sd) {
4999 kobject_uevent(&mddev->kobj, KOBJ_ADD);
5000 mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state");
5006 static struct kobject *md_probe(dev_t dev, int *part, void *data)
5008 md_alloc(dev, NULL);
5012 static int add_named_array(const char *val, struct kernel_param *kp)
5014 /* val must be "md_*" where * is not all digits.
5015 * We allocate an array with a large free minor number, and
5016 * set the name to val. val must not already be an active name.
5018 int len = strlen(val);
5019 char buf[DISK_NAME_LEN];
5021 while (len && val[len-1] == '\n')
5023 if (len >= DISK_NAME_LEN)
5025 strlcpy(buf, val, len+1);
5026 if (strncmp(buf, "md_", 3) != 0)
5028 return md_alloc(0, buf);
5031 static void md_safemode_timeout(unsigned long data)
5033 struct mddev *mddev = (struct mddev *) data;
5035 if (!atomic_read(&mddev->writes_pending)) {
5036 mddev->safemode = 1;
5037 if (mddev->external)
5038 sysfs_notify_dirent_safe(mddev->sysfs_state);
5040 md_wakeup_thread(mddev->thread);
5043 static int start_dirty_degraded;
5045 int md_run(struct mddev *mddev)
5048 struct md_rdev *rdev;
5049 struct md_personality *pers;
5051 if (list_empty(&mddev->disks))
5052 /* cannot run an array with no devices.. */
5057 /* Cannot run until previous stop completes properly */
5058 if (mddev->sysfs_active)
5062 * Analyze all RAID superblock(s)
5064 if (!mddev->raid_disks) {
5065 if (!mddev->persistent)
5070 if (mddev->level != LEVEL_NONE)
5071 request_module("md-level-%d", mddev->level);
5072 else if (mddev->clevel[0])
5073 request_module("md-%s", mddev->clevel);
5076 * Drop all container device buffers, from now on
5077 * the only valid external interface is through the md
5080 rdev_for_each(rdev, mddev) {
5081 if (test_bit(Faulty, &rdev->flags))
5083 sync_blockdev(rdev->bdev);
5084 invalidate_bdev(rdev->bdev);
5086 /* perform some consistency tests on the device.
5087 * We don't want the data to overlap the metadata,
5088 * Internal Bitmap issues have been handled elsewhere.
5090 if (rdev->meta_bdev) {
5091 /* Nothing to check */;
5092 } else if (rdev->data_offset < rdev->sb_start) {
5093 if (mddev->dev_sectors &&
5094 rdev->data_offset + mddev->dev_sectors
5096 printk("md: %s: data overlaps metadata\n",
5101 if (rdev->sb_start + rdev->sb_size/512
5102 > rdev->data_offset) {
5103 printk("md: %s: metadata overlaps data\n",
5108 sysfs_notify_dirent_safe(rdev->sysfs_state);
5111 if (mddev->bio_set == NULL)
5112 mddev->bio_set = bioset_create(BIO_POOL_SIZE, 0);
5114 spin_lock(&pers_lock);
5115 pers = find_pers(mddev->level, mddev->clevel);
5116 if (!pers || !try_module_get(pers->owner)) {
5117 spin_unlock(&pers_lock);
5118 if (mddev->level != LEVEL_NONE)
5119 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
5122 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
5126 spin_unlock(&pers_lock);
5127 if (mddev->level != pers->level) {
5128 mddev->level = pers->level;
5129 mddev->new_level = pers->level;
5131 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
5133 if (mddev->reshape_position != MaxSector &&
5134 pers->start_reshape == NULL) {
5135 /* This personality cannot handle reshaping... */
5136 module_put(pers->owner);
5140 if (pers->sync_request) {
5141 /* Warn if this is a potentially silly
5144 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
5145 struct md_rdev *rdev2;
5148 rdev_for_each(rdev, mddev)
5149 rdev_for_each(rdev2, mddev) {
5151 rdev->bdev->bd_contains ==
5152 rdev2->bdev->bd_contains) {
5154 "%s: WARNING: %s appears to be"
5155 " on the same physical disk as"
5158 bdevname(rdev->bdev,b),
5159 bdevname(rdev2->bdev,b2));
5166 "True protection against single-disk"
5167 " failure might be compromised.\n");
5170 mddev->recovery = 0;
5171 /* may be over-ridden by personality */
5172 mddev->resync_max_sectors = mddev->dev_sectors;
5174 mddev->ok_start_degraded = start_dirty_degraded;
5176 if (start_readonly && mddev->ro == 0)
5177 mddev->ro = 2; /* read-only, but switch on first write */
5179 err = pers->run(mddev);
5181 printk(KERN_ERR "md: pers->run() failed ...\n");
5182 else if (pers->size(mddev, 0, 0) < mddev->array_sectors) {
5183 WARN_ONCE(!mddev->external_size, "%s: default size too small,"
5184 " but 'external_size' not in effect?\n", __func__);
5186 "md: invalid array_size %llu > default size %llu\n",
5187 (unsigned long long)mddev->array_sectors / 2,
5188 (unsigned long long)pers->size(mddev, 0, 0) / 2);
5191 if (err == 0 && pers->sync_request &&
5192 (mddev->bitmap_info.file || mddev->bitmap_info.offset)) {
5193 struct bitmap *bitmap;
5195 bitmap = bitmap_create(mddev, -1);
5196 if (IS_ERR(bitmap)) {
5197 err = PTR_ERR(bitmap);
5198 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
5199 mdname(mddev), err);
5201 mddev->bitmap = bitmap;
5205 mddev_detach(mddev);
5207 pers->free(mddev, mddev->private);
5208 mddev->private = NULL;
5209 module_put(pers->owner);
5210 bitmap_destroy(mddev);
5214 mddev->queue->backing_dev_info.congested_data = mddev;
5215 mddev->queue->backing_dev_info.congested_fn = md_congested;
5217 if (pers->sync_request) {
5218 if (mddev->kobj.sd &&
5219 sysfs_create_group(&mddev->kobj, &md_redundancy_group))
5221 "md: cannot register extra attributes for %s\n",
5223 mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action");
5224 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
5227 atomic_set(&mddev->writes_pending,0);
5228 atomic_set(&mddev->max_corr_read_errors,
5229 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS);
5230 mddev->safemode = 0;
5231 if (mddev_is_clustered(mddev))
5232 mddev->safemode_delay = 0;
5234 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
5237 spin_lock(&mddev->lock);
5240 spin_unlock(&mddev->lock);
5241 rdev_for_each(rdev, mddev)
5242 if (rdev->raid_disk >= 0)
5243 if (sysfs_link_rdev(mddev, rdev))
5244 /* failure here is OK */;
5246 if (mddev->degraded && !mddev->ro)
5247 /* This ensures that recovering status is reported immediately
5248 * via sysfs - until a lack of spares is confirmed.
5250 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
5251 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5253 if (mddev->flags & MD_UPDATE_SB_FLAGS)
5254 md_update_sb(mddev, 0);
5256 md_new_event(mddev);
5257 sysfs_notify_dirent_safe(mddev->sysfs_state);
5258 sysfs_notify_dirent_safe(mddev->sysfs_action);
5259 sysfs_notify(&mddev->kobj, NULL, "degraded");
5262 EXPORT_SYMBOL_GPL(md_run);
5264 static int do_md_run(struct mddev *mddev)
5268 err = md_run(mddev);
5271 err = bitmap_load(mddev);
5273 bitmap_destroy(mddev);
5277 if (mddev_is_clustered(mddev))
5278 md_allow_write(mddev);
5280 md_wakeup_thread(mddev->thread);
5281 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
5283 set_capacity(mddev->gendisk, mddev->array_sectors);
5284 revalidate_disk(mddev->gendisk);
5286 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
5291 static int restart_array(struct mddev *mddev)
5293 struct gendisk *disk = mddev->gendisk;
5295 /* Complain if it has no devices */
5296 if (list_empty(&mddev->disks))
5302 mddev->safemode = 0;
5304 set_disk_ro(disk, 0);
5305 printk(KERN_INFO "md: %s switched to read-write mode.\n",
5307 /* Kick recovery or resync if necessary */
5308 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5309 md_wakeup_thread(mddev->thread);
5310 md_wakeup_thread(mddev->sync_thread);
5311 sysfs_notify_dirent_safe(mddev->sysfs_state);
5315 static void md_clean(struct mddev *mddev)
5317 mddev->array_sectors = 0;
5318 mddev->external_size = 0;
5319 mddev->dev_sectors = 0;
5320 mddev->raid_disks = 0;
5321 mddev->recovery_cp = 0;
5322 mddev->resync_min = 0;
5323 mddev->resync_max = MaxSector;
5324 mddev->reshape_position = MaxSector;
5325 mddev->external = 0;
5326 mddev->persistent = 0;
5327 mddev->level = LEVEL_NONE;
5328 mddev->clevel[0] = 0;
5331 mddev->metadata_type[0] = 0;
5332 mddev->chunk_sectors = 0;
5333 mddev->ctime = mddev->utime = 0;
5335 mddev->max_disks = 0;
5337 mddev->can_decrease_events = 0;
5338 mddev->delta_disks = 0;
5339 mddev->reshape_backwards = 0;
5340 mddev->new_level = LEVEL_NONE;
5341 mddev->new_layout = 0;
5342 mddev->new_chunk_sectors = 0;
5343 mddev->curr_resync = 0;
5344 atomic64_set(&mddev->resync_mismatches, 0);
5345 mddev->suspend_lo = mddev->suspend_hi = 0;
5346 mddev->sync_speed_min = mddev->sync_speed_max = 0;
5347 mddev->recovery = 0;
5350 mddev->degraded = 0;
5351 mddev->safemode = 0;
5352 mddev->private = NULL;
5353 mddev->bitmap_info.offset = 0;
5354 mddev->bitmap_info.default_offset = 0;
5355 mddev->bitmap_info.default_space = 0;
5356 mddev->bitmap_info.chunksize = 0;
5357 mddev->bitmap_info.daemon_sleep = 0;
5358 mddev->bitmap_info.max_write_behind = 0;
5361 static void __md_stop_writes(struct mddev *mddev)
5363 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5364 flush_workqueue(md_misc_wq);
5365 if (mddev->sync_thread) {
5366 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5367 md_reap_sync_thread(mddev);
5370 del_timer_sync(&mddev->safemode_timer);
5372 bitmap_flush(mddev);
5373 md_super_wait(mddev);
5375 if (mddev->ro == 0 &&
5376 ((!mddev->in_sync && !mddev_is_clustered(mddev)) ||
5377 (mddev->flags & MD_UPDATE_SB_FLAGS))) {
5378 /* mark array as shutdown cleanly */
5379 if (!mddev_is_clustered(mddev))
5381 md_update_sb(mddev, 1);
5385 void md_stop_writes(struct mddev *mddev)
5387 mddev_lock_nointr(mddev);
5388 __md_stop_writes(mddev);
5389 mddev_unlock(mddev);
5391 EXPORT_SYMBOL_GPL(md_stop_writes);
5393 static void mddev_detach(struct mddev *mddev)
5395 struct bitmap *bitmap = mddev->bitmap;
5396 /* wait for behind writes to complete */
5397 if (bitmap && atomic_read(&bitmap->behind_writes) > 0) {
5398 printk(KERN_INFO "md:%s: behind writes in progress - waiting to stop.\n",
5400 /* need to kick something here to make sure I/O goes? */
5401 wait_event(bitmap->behind_wait,
5402 atomic_read(&bitmap->behind_writes) == 0);
5404 if (mddev->pers && mddev->pers->quiesce) {
5405 mddev->pers->quiesce(mddev, 1);
5406 mddev->pers->quiesce(mddev, 0);
5408 md_unregister_thread(&mddev->thread);
5410 blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/
5413 static void __md_stop(struct mddev *mddev)
5415 struct md_personality *pers = mddev->pers;
5416 mddev_detach(mddev);
5417 /* Ensure ->event_work is done */
5418 flush_workqueue(md_misc_wq);
5419 spin_lock(&mddev->lock);
5422 spin_unlock(&mddev->lock);
5423 pers->free(mddev, mddev->private);
5424 mddev->private = NULL;
5425 if (pers->sync_request && mddev->to_remove == NULL)
5426 mddev->to_remove = &md_redundancy_group;
5427 module_put(pers->owner);
5428 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5431 void md_stop(struct mddev *mddev)
5433 /* stop the array and free an attached data structures.
5434 * This is called from dm-raid
5437 bitmap_destroy(mddev);
5439 bioset_free(mddev->bio_set);
5442 EXPORT_SYMBOL_GPL(md_stop);
5444 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev)
5449 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
5451 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5452 md_wakeup_thread(mddev->thread);
5454 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5455 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5456 if (mddev->sync_thread)
5457 /* Thread might be blocked waiting for metadata update
5458 * which will now never happen */
5459 wake_up_process(mddev->sync_thread->tsk);
5461 if (mddev->external && test_bit(MD_CHANGE_PENDING, &mddev->flags))
5463 mddev_unlock(mddev);
5464 wait_event(resync_wait, !test_bit(MD_RECOVERY_RUNNING,
5466 wait_event(mddev->sb_wait,
5467 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
5468 mddev_lock_nointr(mddev);
5470 mutex_lock(&mddev->open_mutex);
5471 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
5472 mddev->sync_thread ||
5473 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
5474 (bdev && !test_bit(MD_STILL_CLOSED, &mddev->flags))) {
5475 printk("md: %s still in use.\n",mdname(mddev));
5477 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5478 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5479 md_wakeup_thread(mddev->thread);
5485 __md_stop_writes(mddev);
5491 set_disk_ro(mddev->gendisk, 1);
5492 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5493 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5494 md_wakeup_thread(mddev->thread);
5495 sysfs_notify_dirent_safe(mddev->sysfs_state);
5499 mutex_unlock(&mddev->open_mutex);
5504 * 0 - completely stop and dis-assemble array
5505 * 2 - stop but do not disassemble array
5507 static int do_md_stop(struct mddev *mddev, int mode,
5508 struct block_device *bdev)
5510 struct gendisk *disk = mddev->gendisk;
5511 struct md_rdev *rdev;
5514 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
5516 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5517 md_wakeup_thread(mddev->thread);
5519 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5520 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5521 if (mddev->sync_thread)
5522 /* Thread might be blocked waiting for metadata update
5523 * which will now never happen */
5524 wake_up_process(mddev->sync_thread->tsk);
5526 mddev_unlock(mddev);
5527 wait_event(resync_wait, (mddev->sync_thread == NULL &&
5528 !test_bit(MD_RECOVERY_RUNNING,
5529 &mddev->recovery)));
5530 mddev_lock_nointr(mddev);
5532 mutex_lock(&mddev->open_mutex);
5533 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
5534 mddev->sysfs_active ||
5535 mddev->sync_thread ||
5536 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
5537 (bdev && !test_bit(MD_STILL_CLOSED, &mddev->flags))) {
5538 printk("md: %s still in use.\n",mdname(mddev));
5539 mutex_unlock(&mddev->open_mutex);
5541 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5542 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5543 md_wakeup_thread(mddev->thread);
5549 set_disk_ro(disk, 0);
5551 __md_stop_writes(mddev);
5553 mddev->queue->backing_dev_info.congested_fn = NULL;
5555 /* tell userspace to handle 'inactive' */
5556 sysfs_notify_dirent_safe(mddev->sysfs_state);
5558 rdev_for_each(rdev, mddev)
5559 if (rdev->raid_disk >= 0)
5560 sysfs_unlink_rdev(mddev, rdev);
5562 set_capacity(disk, 0);
5563 mutex_unlock(&mddev->open_mutex);
5565 revalidate_disk(disk);
5570 mutex_unlock(&mddev->open_mutex);
5572 * Free resources if final stop
5575 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
5577 bitmap_destroy(mddev);
5578 if (mddev->bitmap_info.file) {
5579 struct file *f = mddev->bitmap_info.file;
5580 spin_lock(&mddev->lock);
5581 mddev->bitmap_info.file = NULL;
5582 spin_unlock(&mddev->lock);
5585 mddev->bitmap_info.offset = 0;
5587 export_array(mddev);
5590 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
5591 if (mddev->hold_active == UNTIL_STOP)
5592 mddev->hold_active = 0;
5594 blk_integrity_unregister(disk);
5595 md_new_event(mddev);
5596 sysfs_notify_dirent_safe(mddev->sysfs_state);
5601 static void autorun_array(struct mddev *mddev)
5603 struct md_rdev *rdev;
5606 if (list_empty(&mddev->disks))
5609 printk(KERN_INFO "md: running: ");
5611 rdev_for_each(rdev, mddev) {
5612 char b[BDEVNAME_SIZE];
5613 printk("<%s>", bdevname(rdev->bdev,b));
5617 err = do_md_run(mddev);
5619 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
5620 do_md_stop(mddev, 0, NULL);
5625 * lets try to run arrays based on all disks that have arrived
5626 * until now. (those are in pending_raid_disks)
5628 * the method: pick the first pending disk, collect all disks with
5629 * the same UUID, remove all from the pending list and put them into
5630 * the 'same_array' list. Then order this list based on superblock
5631 * update time (freshest comes first), kick out 'old' disks and
5632 * compare superblocks. If everything's fine then run it.
5634 * If "unit" is allocated, then bump its reference count
5636 static void autorun_devices(int part)
5638 struct md_rdev *rdev0, *rdev, *tmp;
5639 struct mddev *mddev;
5640 char b[BDEVNAME_SIZE];
5642 printk(KERN_INFO "md: autorun ...\n");
5643 while (!list_empty(&pending_raid_disks)) {
5646 LIST_HEAD(candidates);
5647 rdev0 = list_entry(pending_raid_disks.next,
5648 struct md_rdev, same_set);
5650 printk(KERN_INFO "md: considering %s ...\n",
5651 bdevname(rdev0->bdev,b));
5652 INIT_LIST_HEAD(&candidates);
5653 rdev_for_each_list(rdev, tmp, &pending_raid_disks)
5654 if (super_90_load(rdev, rdev0, 0) >= 0) {
5655 printk(KERN_INFO "md: adding %s ...\n",
5656 bdevname(rdev->bdev,b));
5657 list_move(&rdev->same_set, &candidates);
5660 * now we have a set of devices, with all of them having
5661 * mostly sane superblocks. It's time to allocate the
5665 dev = MKDEV(mdp_major,
5666 rdev0->preferred_minor << MdpMinorShift);
5667 unit = MINOR(dev) >> MdpMinorShift;
5669 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
5672 if (rdev0->preferred_minor != unit) {
5673 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
5674 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
5678 md_probe(dev, NULL, NULL);
5679 mddev = mddev_find(dev);
5680 if (!mddev || !mddev->gendisk) {
5684 "md: cannot allocate memory for md drive.\n");
5687 if (mddev_lock(mddev))
5688 printk(KERN_WARNING "md: %s locked, cannot run\n",
5690 else if (mddev->raid_disks || mddev->major_version
5691 || !list_empty(&mddev->disks)) {
5693 "md: %s already running, cannot run %s\n",
5694 mdname(mddev), bdevname(rdev0->bdev,b));
5695 mddev_unlock(mddev);
5697 printk(KERN_INFO "md: created %s\n", mdname(mddev));
5698 mddev->persistent = 1;
5699 rdev_for_each_list(rdev, tmp, &candidates) {
5700 list_del_init(&rdev->same_set);
5701 if (bind_rdev_to_array(rdev, mddev))
5704 autorun_array(mddev);
5705 mddev_unlock(mddev);
5707 /* on success, candidates will be empty, on error
5710 rdev_for_each_list(rdev, tmp, &candidates) {
5711 list_del_init(&rdev->same_set);
5716 printk(KERN_INFO "md: ... autorun DONE.\n");
5718 #endif /* !MODULE */
5720 static int get_version(void __user *arg)
5724 ver.major = MD_MAJOR_VERSION;
5725 ver.minor = MD_MINOR_VERSION;
5726 ver.patchlevel = MD_PATCHLEVEL_VERSION;
5728 if (copy_to_user(arg, &ver, sizeof(ver)))
5734 static int get_array_info(struct mddev *mddev, void __user *arg)
5736 mdu_array_info_t info;
5737 int nr,working,insync,failed,spare;
5738 struct md_rdev *rdev;
5740 nr = working = insync = failed = spare = 0;
5742 rdev_for_each_rcu(rdev, mddev) {
5744 if (test_bit(Faulty, &rdev->flags))
5748 if (test_bit(In_sync, &rdev->flags))
5756 info.major_version = mddev->major_version;
5757 info.minor_version = mddev->minor_version;
5758 info.patch_version = MD_PATCHLEVEL_VERSION;
5759 info.ctime = mddev->ctime;
5760 info.level = mddev->level;
5761 info.size = mddev->dev_sectors / 2;
5762 if (info.size != mddev->dev_sectors / 2) /* overflow */
5765 info.raid_disks = mddev->raid_disks;
5766 info.md_minor = mddev->md_minor;
5767 info.not_persistent= !mddev->persistent;
5769 info.utime = mddev->utime;
5772 info.state = (1<<MD_SB_CLEAN);
5773 if (mddev->bitmap && mddev->bitmap_info.offset)
5774 info.state |= (1<<MD_SB_BITMAP_PRESENT);
5775 if (mddev_is_clustered(mddev))
5776 info.state |= (1<<MD_SB_CLUSTERED);
5777 info.active_disks = insync;
5778 info.working_disks = working;
5779 info.failed_disks = failed;
5780 info.spare_disks = spare;
5782 info.layout = mddev->layout;
5783 info.chunk_size = mddev->chunk_sectors << 9;
5785 if (copy_to_user(arg, &info, sizeof(info)))
5791 static int get_bitmap_file(struct mddev *mddev, void __user * arg)
5793 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
5797 file = kzalloc(sizeof(*file), GFP_NOIO);
5802 spin_lock(&mddev->lock);
5803 /* bitmap enabled */
5804 if (mddev->bitmap_info.file) {
5805 ptr = file_path(mddev->bitmap_info.file, file->pathname,
5806 sizeof(file->pathname));
5810 memmove(file->pathname, ptr,
5811 sizeof(file->pathname)-(ptr-file->pathname));
5813 spin_unlock(&mddev->lock);
5816 copy_to_user(arg, file, sizeof(*file)))
5823 static int get_disk_info(struct mddev *mddev, void __user * arg)
5825 mdu_disk_info_t info;
5826 struct md_rdev *rdev;
5828 if (copy_from_user(&info, arg, sizeof(info)))
5832 rdev = md_find_rdev_nr_rcu(mddev, info.number);
5834 info.major = MAJOR(rdev->bdev->bd_dev);
5835 info.minor = MINOR(rdev->bdev->bd_dev);
5836 info.raid_disk = rdev->raid_disk;
5838 if (test_bit(Faulty, &rdev->flags))
5839 info.state |= (1<<MD_DISK_FAULTY);
5840 else if (test_bit(In_sync, &rdev->flags)) {
5841 info.state |= (1<<MD_DISK_ACTIVE);
5842 info.state |= (1<<MD_DISK_SYNC);
5844 if (test_bit(WriteMostly, &rdev->flags))
5845 info.state |= (1<<MD_DISK_WRITEMOSTLY);
5847 info.major = info.minor = 0;
5848 info.raid_disk = -1;
5849 info.state = (1<<MD_DISK_REMOVED);
5853 if (copy_to_user(arg, &info, sizeof(info)))
5859 static int add_new_disk(struct mddev *mddev, mdu_disk_info_t *info)
5861 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
5862 struct md_rdev *rdev;
5863 dev_t dev = MKDEV(info->major,info->minor);
5865 if (mddev_is_clustered(mddev) &&
5866 !(info->state & ((1 << MD_DISK_CLUSTER_ADD) | (1 << MD_DISK_CANDIDATE)))) {
5867 pr_err("%s: Cannot add to clustered mddev.\n",
5872 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
5875 if (!mddev->raid_disks) {
5877 /* expecting a device which has a superblock */
5878 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
5881 "md: md_import_device returned %ld\n",
5883 return PTR_ERR(rdev);
5885 if (!list_empty(&mddev->disks)) {
5886 struct md_rdev *rdev0
5887 = list_entry(mddev->disks.next,
5888 struct md_rdev, same_set);
5889 err = super_types[mddev->major_version]
5890 .load_super(rdev, rdev0, mddev->minor_version);
5893 "md: %s has different UUID to %s\n",
5894 bdevname(rdev->bdev,b),
5895 bdevname(rdev0->bdev,b2));
5900 err = bind_rdev_to_array(rdev, mddev);
5907 * add_new_disk can be used once the array is assembled
5908 * to add "hot spares". They must already have a superblock
5913 if (!mddev->pers->hot_add_disk) {
5915 "%s: personality does not support diskops!\n",
5919 if (mddev->persistent)
5920 rdev = md_import_device(dev, mddev->major_version,
5921 mddev->minor_version);
5923 rdev = md_import_device(dev, -1, -1);
5926 "md: md_import_device returned %ld\n",
5928 return PTR_ERR(rdev);
5930 /* set saved_raid_disk if appropriate */
5931 if (!mddev->persistent) {
5932 if (info->state & (1<<MD_DISK_SYNC) &&
5933 info->raid_disk < mddev->raid_disks) {
5934 rdev->raid_disk = info->raid_disk;
5935 set_bit(In_sync, &rdev->flags);
5936 clear_bit(Bitmap_sync, &rdev->flags);
5938 rdev->raid_disk = -1;
5939 rdev->saved_raid_disk = rdev->raid_disk;
5941 super_types[mddev->major_version].
5942 validate_super(mddev, rdev);
5943 if ((info->state & (1<<MD_DISK_SYNC)) &&
5944 rdev->raid_disk != info->raid_disk) {
5945 /* This was a hot-add request, but events doesn't
5946 * match, so reject it.
5952 clear_bit(In_sync, &rdev->flags); /* just to be sure */
5953 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
5954 set_bit(WriteMostly, &rdev->flags);
5956 clear_bit(WriteMostly, &rdev->flags);
5959 * check whether the device shows up in other nodes
5961 if (mddev_is_clustered(mddev)) {
5962 if (info->state & (1 << MD_DISK_CANDIDATE))
5963 set_bit(Candidate, &rdev->flags);
5964 else if (info->state & (1 << MD_DISK_CLUSTER_ADD)) {
5965 /* --add initiated by this node */
5966 err = md_cluster_ops->add_new_disk(mddev, rdev);
5974 rdev->raid_disk = -1;
5975 err = bind_rdev_to_array(rdev, mddev);
5980 if (mddev_is_clustered(mddev)) {
5981 if (info->state & (1 << MD_DISK_CANDIDATE))
5982 md_cluster_ops->new_disk_ack(mddev, (err == 0));
5985 md_cluster_ops->add_new_disk_cancel(mddev);
5987 err = add_bound_rdev(rdev);
5991 err = add_bound_rdev(rdev);
5996 /* otherwise, add_new_disk is only allowed
5997 * for major_version==0 superblocks
5999 if (mddev->major_version != 0) {
6000 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
6005 if (!(info->state & (1<<MD_DISK_FAULTY))) {
6007 rdev = md_import_device(dev, -1, 0);
6010 "md: error, md_import_device() returned %ld\n",
6012 return PTR_ERR(rdev);
6014 rdev->desc_nr = info->number;
6015 if (info->raid_disk < mddev->raid_disks)
6016 rdev->raid_disk = info->raid_disk;
6018 rdev->raid_disk = -1;
6020 if (rdev->raid_disk < mddev->raid_disks)
6021 if (info->state & (1<<MD_DISK_SYNC))
6022 set_bit(In_sync, &rdev->flags);
6024 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
6025 set_bit(WriteMostly, &rdev->flags);
6027 if (!mddev->persistent) {
6028 printk(KERN_INFO "md: nonpersistent superblock ...\n");
6029 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
6031 rdev->sb_start = calc_dev_sboffset(rdev);
6032 rdev->sectors = rdev->sb_start;
6034 err = bind_rdev_to_array(rdev, mddev);
6044 static int hot_remove_disk(struct mddev *mddev, dev_t dev)
6046 char b[BDEVNAME_SIZE];
6047 struct md_rdev *rdev;
6050 rdev = find_rdev(mddev, dev);
6054 if (mddev_is_clustered(mddev))
6055 ret = md_cluster_ops->metadata_update_start(mddev);
6057 if (rdev->raid_disk < 0)
6060 clear_bit(Blocked, &rdev->flags);
6061 remove_and_add_spares(mddev, rdev);
6063 if (rdev->raid_disk >= 0)
6067 if (mddev_is_clustered(mddev) && ret == 0)
6068 md_cluster_ops->remove_disk(mddev, rdev);
6070 md_kick_rdev_from_array(rdev);
6071 md_update_sb(mddev, 1);
6072 md_new_event(mddev);
6076 if (mddev_is_clustered(mddev) && ret == 0)
6077 md_cluster_ops->metadata_update_cancel(mddev);
6079 printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n",
6080 bdevname(rdev->bdev,b), mdname(mddev));
6084 static int hot_add_disk(struct mddev *mddev, dev_t dev)
6086 char b[BDEVNAME_SIZE];
6088 struct md_rdev *rdev;
6093 if (mddev->major_version != 0) {
6094 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
6095 " version-0 superblocks.\n",
6099 if (!mddev->pers->hot_add_disk) {
6101 "%s: personality does not support diskops!\n",
6106 rdev = md_import_device(dev, -1, 0);
6109 "md: error, md_import_device() returned %ld\n",
6114 if (mddev->persistent)
6115 rdev->sb_start = calc_dev_sboffset(rdev);
6117 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
6119 rdev->sectors = rdev->sb_start;
6121 if (test_bit(Faulty, &rdev->flags)) {
6123 "md: can not hot-add faulty %s disk to %s!\n",
6124 bdevname(rdev->bdev,b), mdname(mddev));
6129 clear_bit(In_sync, &rdev->flags);
6131 rdev->saved_raid_disk = -1;
6132 err = bind_rdev_to_array(rdev, mddev);
6137 * The rest should better be atomic, we can have disk failures
6138 * noticed in interrupt contexts ...
6141 rdev->raid_disk = -1;
6143 md_update_sb(mddev, 1);
6145 * Kick recovery, maybe this spare has to be added to the
6146 * array immediately.
6148 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6149 md_wakeup_thread(mddev->thread);
6150 md_new_event(mddev);
6158 static int set_bitmap_file(struct mddev *mddev, int fd)
6163 if (!mddev->pers->quiesce || !mddev->thread)
6165 if (mddev->recovery || mddev->sync_thread)
6167 /* we should be able to change the bitmap.. */
6171 struct inode *inode;
6174 if (mddev->bitmap || mddev->bitmap_info.file)
6175 return -EEXIST; /* cannot add when bitmap is present */
6179 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
6184 inode = f->f_mapping->host;
6185 if (!S_ISREG(inode->i_mode)) {
6186 printk(KERN_ERR "%s: error: bitmap file must be a regular file\n",
6189 } else if (!(f->f_mode & FMODE_WRITE)) {
6190 printk(KERN_ERR "%s: error: bitmap file must open for write\n",
6193 } else if (atomic_read(&inode->i_writecount) != 1) {
6194 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
6202 mddev->bitmap_info.file = f;
6203 mddev->bitmap_info.offset = 0; /* file overrides offset */
6204 } else if (mddev->bitmap == NULL)
6205 return -ENOENT; /* cannot remove what isn't there */
6208 mddev->pers->quiesce(mddev, 1);
6210 struct bitmap *bitmap;
6212 bitmap = bitmap_create(mddev, -1);
6213 if (!IS_ERR(bitmap)) {
6214 mddev->bitmap = bitmap;
6215 err = bitmap_load(mddev);
6217 err = PTR_ERR(bitmap);
6219 if (fd < 0 || err) {
6220 bitmap_destroy(mddev);
6221 fd = -1; /* make sure to put the file */
6223 mddev->pers->quiesce(mddev, 0);
6226 struct file *f = mddev->bitmap_info.file;
6228 spin_lock(&mddev->lock);
6229 mddev->bitmap_info.file = NULL;
6230 spin_unlock(&mddev->lock);
6239 * set_array_info is used two different ways
6240 * The original usage is when creating a new array.
6241 * In this usage, raid_disks is > 0 and it together with
6242 * level, size, not_persistent,layout,chunksize determine the
6243 * shape of the array.
6244 * This will always create an array with a type-0.90.0 superblock.
6245 * The newer usage is when assembling an array.
6246 * In this case raid_disks will be 0, and the major_version field is
6247 * use to determine which style super-blocks are to be found on the devices.
6248 * The minor and patch _version numbers are also kept incase the
6249 * super_block handler wishes to interpret them.
6251 static int set_array_info(struct mddev *mddev, mdu_array_info_t *info)
6254 if (info->raid_disks == 0) {
6255 /* just setting version number for superblock loading */
6256 if (info->major_version < 0 ||
6257 info->major_version >= ARRAY_SIZE(super_types) ||
6258 super_types[info->major_version].name == NULL) {
6259 /* maybe try to auto-load a module? */
6261 "md: superblock version %d not known\n",
6262 info->major_version);
6265 mddev->major_version = info->major_version;
6266 mddev->minor_version = info->minor_version;
6267 mddev->patch_version = info->patch_version;
6268 mddev->persistent = !info->not_persistent;
6269 /* ensure mddev_put doesn't delete this now that there
6270 * is some minimal configuration.
6272 mddev->ctime = get_seconds();
6275 mddev->major_version = MD_MAJOR_VERSION;
6276 mddev->minor_version = MD_MINOR_VERSION;
6277 mddev->patch_version = MD_PATCHLEVEL_VERSION;
6278 mddev->ctime = get_seconds();
6280 mddev->level = info->level;
6281 mddev->clevel[0] = 0;
6282 mddev->dev_sectors = 2 * (sector_t)info->size;
6283 mddev->raid_disks = info->raid_disks;
6284 /* don't set md_minor, it is determined by which /dev/md* was
6287 if (info->state & (1<<MD_SB_CLEAN))
6288 mddev->recovery_cp = MaxSector;
6290 mddev->recovery_cp = 0;
6291 mddev->persistent = ! info->not_persistent;
6292 mddev->external = 0;
6294 mddev->layout = info->layout;
6295 mddev->chunk_sectors = info->chunk_size >> 9;
6297 mddev->max_disks = MD_SB_DISKS;
6299 if (mddev->persistent)
6301 set_bit(MD_CHANGE_DEVS, &mddev->flags);
6303 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
6304 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
6305 mddev->bitmap_info.offset = 0;
6307 mddev->reshape_position = MaxSector;
6310 * Generate a 128 bit UUID
6312 get_random_bytes(mddev->uuid, 16);
6314 mddev->new_level = mddev->level;
6315 mddev->new_chunk_sectors = mddev->chunk_sectors;
6316 mddev->new_layout = mddev->layout;
6317 mddev->delta_disks = 0;
6318 mddev->reshape_backwards = 0;
6323 void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors)
6325 WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__);
6327 if (mddev->external_size)
6330 mddev->array_sectors = array_sectors;
6332 EXPORT_SYMBOL(md_set_array_sectors);
6334 static int update_size(struct mddev *mddev, sector_t num_sectors)
6336 struct md_rdev *rdev;
6338 int fit = (num_sectors == 0);
6340 if (mddev->pers->resize == NULL)
6342 /* The "num_sectors" is the number of sectors of each device that
6343 * is used. This can only make sense for arrays with redundancy.
6344 * linear and raid0 always use whatever space is available. We can only
6345 * consider changing this number if no resync or reconstruction is
6346 * happening, and if the new size is acceptable. It must fit before the
6347 * sb_start or, if that is <data_offset, it must fit before the size
6348 * of each device. If num_sectors is zero, we find the largest size
6351 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
6357 rdev_for_each(rdev, mddev) {
6358 sector_t avail = rdev->sectors;
6360 if (fit && (num_sectors == 0 || num_sectors > avail))
6361 num_sectors = avail;
6362 if (avail < num_sectors)
6365 rv = mddev->pers->resize(mddev, num_sectors);
6367 revalidate_disk(mddev->gendisk);
6371 static int update_raid_disks(struct mddev *mddev, int raid_disks)
6374 struct md_rdev *rdev;
6375 /* change the number of raid disks */
6376 if (mddev->pers->check_reshape == NULL)
6380 if (raid_disks <= 0 ||
6381 (mddev->max_disks && raid_disks >= mddev->max_disks))
6383 if (mddev->sync_thread ||
6384 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
6385 mddev->reshape_position != MaxSector)
6388 rdev_for_each(rdev, mddev) {
6389 if (mddev->raid_disks < raid_disks &&
6390 rdev->data_offset < rdev->new_data_offset)
6392 if (mddev->raid_disks > raid_disks &&
6393 rdev->data_offset > rdev->new_data_offset)
6397 mddev->delta_disks = raid_disks - mddev->raid_disks;
6398 if (mddev->delta_disks < 0)
6399 mddev->reshape_backwards = 1;
6400 else if (mddev->delta_disks > 0)
6401 mddev->reshape_backwards = 0;
6403 rv = mddev->pers->check_reshape(mddev);
6405 mddev->delta_disks = 0;
6406 mddev->reshape_backwards = 0;
6412 * update_array_info is used to change the configuration of an
6414 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
6415 * fields in the info are checked against the array.
6416 * Any differences that cannot be handled will cause an error.
6417 * Normally, only one change can be managed at a time.
6419 static int update_array_info(struct mddev *mddev, mdu_array_info_t *info)
6425 /* calculate expected state,ignoring low bits */
6426 if (mddev->bitmap && mddev->bitmap_info.offset)
6427 state |= (1 << MD_SB_BITMAP_PRESENT);
6429 if (mddev->major_version != info->major_version ||
6430 mddev->minor_version != info->minor_version ||
6431 /* mddev->patch_version != info->patch_version || */
6432 mddev->ctime != info->ctime ||
6433 mddev->level != info->level ||
6434 /* mddev->layout != info->layout || */
6435 mddev->persistent != !info->not_persistent ||
6436 mddev->chunk_sectors != info->chunk_size >> 9 ||
6437 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
6438 ((state^info->state) & 0xfffffe00)
6441 /* Check there is only one change */
6442 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
6444 if (mddev->raid_disks != info->raid_disks)
6446 if (mddev->layout != info->layout)
6448 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT))
6455 if (mddev->layout != info->layout) {
6457 * we don't need to do anything at the md level, the
6458 * personality will take care of it all.
6460 if (mddev->pers->check_reshape == NULL)
6463 mddev->new_layout = info->layout;
6464 rv = mddev->pers->check_reshape(mddev);
6466 mddev->new_layout = mddev->layout;
6470 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
6471 rv = update_size(mddev, (sector_t)info->size * 2);
6473 if (mddev->raid_disks != info->raid_disks)
6474 rv = update_raid_disks(mddev, info->raid_disks);
6476 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
6477 if (mddev->pers->quiesce == NULL || mddev->thread == NULL) {
6481 if (mddev->recovery || mddev->sync_thread) {
6485 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
6486 struct bitmap *bitmap;
6487 /* add the bitmap */
6488 if (mddev->bitmap) {
6492 if (mddev->bitmap_info.default_offset == 0) {
6496 mddev->bitmap_info.offset =
6497 mddev->bitmap_info.default_offset;
6498 mddev->bitmap_info.space =
6499 mddev->bitmap_info.default_space;
6500 mddev->pers->quiesce(mddev, 1);
6501 bitmap = bitmap_create(mddev, -1);
6502 if (!IS_ERR(bitmap)) {
6503 mddev->bitmap = bitmap;
6504 rv = bitmap_load(mddev);
6506 rv = PTR_ERR(bitmap);
6508 bitmap_destroy(mddev);
6509 mddev->pers->quiesce(mddev, 0);
6511 /* remove the bitmap */
6512 if (!mddev->bitmap) {
6516 if (mddev->bitmap->storage.file) {
6520 mddev->pers->quiesce(mddev, 1);
6521 bitmap_destroy(mddev);
6522 mddev->pers->quiesce(mddev, 0);
6523 mddev->bitmap_info.offset = 0;
6526 md_update_sb(mddev, 1);
6532 static int set_disk_faulty(struct mddev *mddev, dev_t dev)
6534 struct md_rdev *rdev;
6537 if (mddev->pers == NULL)
6541 rdev = find_rdev_rcu(mddev, dev);
6545 md_error(mddev, rdev);
6546 if (!test_bit(Faulty, &rdev->flags))
6554 * We have a problem here : there is no easy way to give a CHS
6555 * virtual geometry. We currently pretend that we have a 2 heads
6556 * 4 sectors (with a BIG number of cylinders...). This drives
6557 * dosfs just mad... ;-)
6559 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
6561 struct mddev *mddev = bdev->bd_disk->private_data;
6565 geo->cylinders = mddev->array_sectors / 8;
6569 static inline bool md_ioctl_valid(unsigned int cmd)
6574 case GET_ARRAY_INFO:
6575 case GET_BITMAP_FILE:
6578 case HOT_REMOVE_DISK:
6581 case RESTART_ARRAY_RW:
6583 case SET_ARRAY_INFO:
6584 case SET_BITMAP_FILE:
6585 case SET_DISK_FAULTY:
6588 case CLUSTERED_DISK_NACK:
6595 static int md_ioctl(struct block_device *bdev, fmode_t mode,
6596 unsigned int cmd, unsigned long arg)
6599 void __user *argp = (void __user *)arg;
6600 struct mddev *mddev = NULL;
6603 if (!md_ioctl_valid(cmd))
6608 case GET_ARRAY_INFO:
6612 if (!capable(CAP_SYS_ADMIN))
6617 * Commands dealing with the RAID driver but not any
6622 err = get_version(argp);
6628 autostart_arrays(arg);
6635 * Commands creating/starting a new array:
6638 mddev = bdev->bd_disk->private_data;
6645 /* Some actions do not requires the mutex */
6647 case GET_ARRAY_INFO:
6648 if (!mddev->raid_disks && !mddev->external)
6651 err = get_array_info(mddev, argp);
6655 if (!mddev->raid_disks && !mddev->external)
6658 err = get_disk_info(mddev, argp);
6661 case SET_DISK_FAULTY:
6662 err = set_disk_faulty(mddev, new_decode_dev(arg));
6665 case GET_BITMAP_FILE:
6666 err = get_bitmap_file(mddev, argp);
6671 if (cmd == ADD_NEW_DISK)
6672 /* need to ensure md_delayed_delete() has completed */
6673 flush_workqueue(md_misc_wq);
6675 if (cmd == HOT_REMOVE_DISK)
6676 /* need to ensure recovery thread has run */
6677 wait_event_interruptible_timeout(mddev->sb_wait,
6678 !test_bit(MD_RECOVERY_NEEDED,
6680 msecs_to_jiffies(5000));
6681 if (cmd == STOP_ARRAY || cmd == STOP_ARRAY_RO) {
6682 /* Need to flush page cache, and ensure no-one else opens
6685 mutex_lock(&mddev->open_mutex);
6686 if (mddev->pers && atomic_read(&mddev->openers) > 1) {
6687 mutex_unlock(&mddev->open_mutex);
6691 set_bit(MD_STILL_CLOSED, &mddev->flags);
6692 mutex_unlock(&mddev->open_mutex);
6693 sync_blockdev(bdev);
6695 err = mddev_lock(mddev);
6698 "md: ioctl lock interrupted, reason %d, cmd %d\n",
6703 if (cmd == SET_ARRAY_INFO) {
6704 mdu_array_info_t info;
6706 memset(&info, 0, sizeof(info));
6707 else if (copy_from_user(&info, argp, sizeof(info))) {
6712 err = update_array_info(mddev, &info);
6714 printk(KERN_WARNING "md: couldn't update"
6715 " array info. %d\n", err);
6720 if (!list_empty(&mddev->disks)) {
6722 "md: array %s already has disks!\n",
6727 if (mddev->raid_disks) {
6729 "md: array %s already initialised!\n",
6734 err = set_array_info(mddev, &info);
6736 printk(KERN_WARNING "md: couldn't set"
6737 " array info. %d\n", err);
6744 * Commands querying/configuring an existing array:
6746 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
6747 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
6748 if ((!mddev->raid_disks && !mddev->external)
6749 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
6750 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
6751 && cmd != GET_BITMAP_FILE) {
6757 * Commands even a read-only array can execute:
6760 case RESTART_ARRAY_RW:
6761 err = restart_array(mddev);
6765 err = do_md_stop(mddev, 0, bdev);
6769 err = md_set_readonly(mddev, bdev);
6772 case HOT_REMOVE_DISK:
6773 err = hot_remove_disk(mddev, new_decode_dev(arg));
6777 /* We can support ADD_NEW_DISK on read-only arrays
6778 * on if we are re-adding a preexisting device.
6779 * So require mddev->pers and MD_DISK_SYNC.
6782 mdu_disk_info_t info;
6783 if (copy_from_user(&info, argp, sizeof(info)))
6785 else if (!(info.state & (1<<MD_DISK_SYNC)))
6786 /* Need to clear read-only for this */
6789 err = add_new_disk(mddev, &info);
6795 if (get_user(ro, (int __user *)(arg))) {
6801 /* if the bdev is going readonly the value of mddev->ro
6802 * does not matter, no writes are coming
6807 /* are we are already prepared for writes? */
6811 /* transitioning to readauto need only happen for
6812 * arrays that call md_write_start
6815 err = restart_array(mddev);
6818 set_disk_ro(mddev->gendisk, 0);
6825 * The remaining ioctls are changing the state of the
6826 * superblock, so we do not allow them on read-only arrays.
6828 if (mddev->ro && mddev->pers) {
6829 if (mddev->ro == 2) {
6831 sysfs_notify_dirent_safe(mddev->sysfs_state);
6832 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6833 /* mddev_unlock will wake thread */
6834 /* If a device failed while we were read-only, we
6835 * need to make sure the metadata is updated now.
6837 if (test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
6838 mddev_unlock(mddev);
6839 wait_event(mddev->sb_wait,
6840 !test_bit(MD_CHANGE_DEVS, &mddev->flags) &&
6841 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
6842 mddev_lock_nointr(mddev);
6853 mdu_disk_info_t info;
6854 if (copy_from_user(&info, argp, sizeof(info)))
6857 err = add_new_disk(mddev, &info);
6861 case CLUSTERED_DISK_NACK:
6862 if (mddev_is_clustered(mddev))
6863 md_cluster_ops->new_disk_ack(mddev, false);
6869 err = hot_add_disk(mddev, new_decode_dev(arg));
6873 err = do_md_run(mddev);
6876 case SET_BITMAP_FILE:
6877 err = set_bitmap_file(mddev, (int)arg);
6886 if (mddev->hold_active == UNTIL_IOCTL &&
6888 mddev->hold_active = 0;
6889 mddev_unlock(mddev);
6893 #ifdef CONFIG_COMPAT
6894 static int md_compat_ioctl(struct block_device *bdev, fmode_t mode,
6895 unsigned int cmd, unsigned long arg)
6898 case HOT_REMOVE_DISK:
6900 case SET_DISK_FAULTY:
6901 case SET_BITMAP_FILE:
6902 /* These take in integer arg, do not convert */
6905 arg = (unsigned long)compat_ptr(arg);
6909 return md_ioctl(bdev, mode, cmd, arg);
6911 #endif /* CONFIG_COMPAT */
6913 static int md_open(struct block_device *bdev, fmode_t mode)
6916 * Succeed if we can lock the mddev, which confirms that
6917 * it isn't being stopped right now.
6919 struct mddev *mddev = mddev_find(bdev->bd_dev);
6925 if (mddev->gendisk != bdev->bd_disk) {
6926 /* we are racing with mddev_put which is discarding this
6930 /* Wait until bdev->bd_disk is definitely gone */
6931 flush_workqueue(md_misc_wq);
6932 /* Then retry the open from the top */
6933 return -ERESTARTSYS;
6935 BUG_ON(mddev != bdev->bd_disk->private_data);
6937 if ((err = mutex_lock_interruptible(&mddev->open_mutex)))
6941 atomic_inc(&mddev->openers);
6942 clear_bit(MD_STILL_CLOSED, &mddev->flags);
6943 mutex_unlock(&mddev->open_mutex);
6945 check_disk_change(bdev);
6950 static void md_release(struct gendisk *disk, fmode_t mode)
6952 struct mddev *mddev = disk->private_data;
6955 atomic_dec(&mddev->openers);
6959 static int md_media_changed(struct gendisk *disk)
6961 struct mddev *mddev = disk->private_data;
6963 return mddev->changed;
6966 static int md_revalidate(struct gendisk *disk)
6968 struct mddev *mddev = disk->private_data;
6973 static const struct block_device_operations md_fops =
6975 .owner = THIS_MODULE,
6977 .release = md_release,
6979 #ifdef CONFIG_COMPAT
6980 .compat_ioctl = md_compat_ioctl,
6982 .getgeo = md_getgeo,
6983 .media_changed = md_media_changed,
6984 .revalidate_disk= md_revalidate,
6987 static int md_thread(void *arg)
6989 struct md_thread *thread = arg;
6992 * md_thread is a 'system-thread', it's priority should be very
6993 * high. We avoid resource deadlocks individually in each
6994 * raid personality. (RAID5 does preallocation) We also use RR and
6995 * the very same RT priority as kswapd, thus we will never get
6996 * into a priority inversion deadlock.
6998 * we definitely have to have equal or higher priority than
6999 * bdflush, otherwise bdflush will deadlock if there are too
7000 * many dirty RAID5 blocks.
7003 allow_signal(SIGKILL);
7004 while (!kthread_should_stop()) {
7006 /* We need to wait INTERRUPTIBLE so that
7007 * we don't add to the load-average.
7008 * That means we need to be sure no signals are
7011 if (signal_pending(current))
7012 flush_signals(current);
7014 wait_event_interruptible_timeout
7016 test_bit(THREAD_WAKEUP, &thread->flags)
7017 || kthread_should_stop(),
7020 clear_bit(THREAD_WAKEUP, &thread->flags);
7021 if (!kthread_should_stop())
7022 thread->run(thread);
7028 void md_wakeup_thread(struct md_thread *thread)
7031 pr_debug("md: waking up MD thread %s.\n", thread->tsk->comm);
7032 set_bit(THREAD_WAKEUP, &thread->flags);
7033 wake_up(&thread->wqueue);
7036 EXPORT_SYMBOL(md_wakeup_thread);
7038 struct md_thread *md_register_thread(void (*run) (struct md_thread *),
7039 struct mddev *mddev, const char *name)
7041 struct md_thread *thread;
7043 thread = kzalloc(sizeof(struct md_thread), GFP_KERNEL);
7047 init_waitqueue_head(&thread->wqueue);
7050 thread->mddev = mddev;
7051 thread->timeout = MAX_SCHEDULE_TIMEOUT;
7052 thread->tsk = kthread_run(md_thread, thread,
7054 mdname(thread->mddev),
7056 if (IS_ERR(thread->tsk)) {
7062 EXPORT_SYMBOL(md_register_thread);
7064 void md_unregister_thread(struct md_thread **threadp)
7066 struct md_thread *thread = *threadp;
7069 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
7070 /* Locking ensures that mddev_unlock does not wake_up a
7071 * non-existent thread
7073 spin_lock(&pers_lock);
7075 spin_unlock(&pers_lock);
7077 kthread_stop(thread->tsk);
7080 EXPORT_SYMBOL(md_unregister_thread);
7082 void md_error(struct mddev *mddev, struct md_rdev *rdev)
7084 if (!rdev || test_bit(Faulty, &rdev->flags))
7087 if (!mddev->pers || !mddev->pers->error_handler)
7089 mddev->pers->error_handler(mddev,rdev);
7090 if (mddev->degraded)
7091 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7092 sysfs_notify_dirent_safe(rdev->sysfs_state);
7093 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7094 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7095 md_wakeup_thread(mddev->thread);
7096 if (mddev->event_work.func)
7097 queue_work(md_misc_wq, &mddev->event_work);
7098 md_new_event_inintr(mddev);
7100 EXPORT_SYMBOL(md_error);
7102 /* seq_file implementation /proc/mdstat */
7104 static void status_unused(struct seq_file *seq)
7107 struct md_rdev *rdev;
7109 seq_printf(seq, "unused devices: ");
7111 list_for_each_entry(rdev, &pending_raid_disks, same_set) {
7112 char b[BDEVNAME_SIZE];
7114 seq_printf(seq, "%s ",
7115 bdevname(rdev->bdev,b));
7118 seq_printf(seq, "<none>");
7120 seq_printf(seq, "\n");
7123 static int status_resync(struct seq_file *seq, struct mddev *mddev)
7125 sector_t max_sectors, resync, res;
7126 unsigned long dt, db;
7129 unsigned int per_milli;
7131 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
7132 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
7133 max_sectors = mddev->resync_max_sectors;
7135 max_sectors = mddev->dev_sectors;
7137 resync = mddev->curr_resync;
7139 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
7140 /* Still cleaning up */
7141 resync = max_sectors;
7143 resync -= atomic_read(&mddev->recovery_active);
7146 if (mddev->recovery_cp < MaxSector) {
7147 seq_printf(seq, "\tresync=PENDING");
7153 seq_printf(seq, "\tresync=DELAYED");
7157 WARN_ON(max_sectors == 0);
7158 /* Pick 'scale' such that (resync>>scale)*1000 will fit
7159 * in a sector_t, and (max_sectors>>scale) will fit in a
7160 * u32, as those are the requirements for sector_div.
7161 * Thus 'scale' must be at least 10
7164 if (sizeof(sector_t) > sizeof(unsigned long)) {
7165 while ( max_sectors/2 > (1ULL<<(scale+32)))
7168 res = (resync>>scale)*1000;
7169 sector_div(res, (u32)((max_sectors>>scale)+1));
7173 int i, x = per_milli/50, y = 20-x;
7174 seq_printf(seq, "[");
7175 for (i = 0; i < x; i++)
7176 seq_printf(seq, "=");
7177 seq_printf(seq, ">");
7178 for (i = 0; i < y; i++)
7179 seq_printf(seq, ".");
7180 seq_printf(seq, "] ");
7182 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
7183 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
7185 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
7187 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
7188 "resync" : "recovery"))),
7189 per_milli/10, per_milli % 10,
7190 (unsigned long long) resync/2,
7191 (unsigned long long) max_sectors/2);
7194 * dt: time from mark until now
7195 * db: blocks written from mark until now
7196 * rt: remaining time
7198 * rt is a sector_t, so could be 32bit or 64bit.
7199 * So we divide before multiply in case it is 32bit and close
7201 * We scale the divisor (db) by 32 to avoid losing precision
7202 * near the end of resync when the number of remaining sectors
7204 * We then divide rt by 32 after multiplying by db to compensate.
7205 * The '+1' avoids division by zero if db is very small.
7207 dt = ((jiffies - mddev->resync_mark) / HZ);
7209 db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active))
7210 - mddev->resync_mark_cnt;
7212 rt = max_sectors - resync; /* number of remaining sectors */
7213 sector_div(rt, db/32+1);
7217 seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60,
7218 ((unsigned long)rt % 60)/6);
7220 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
7224 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
7226 struct list_head *tmp;
7228 struct mddev *mddev;
7236 spin_lock(&all_mddevs_lock);
7237 list_for_each(tmp,&all_mddevs)
7239 mddev = list_entry(tmp, struct mddev, all_mddevs);
7241 spin_unlock(&all_mddevs_lock);
7244 spin_unlock(&all_mddevs_lock);
7246 return (void*)2;/* tail */
7250 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
7252 struct list_head *tmp;
7253 struct mddev *next_mddev, *mddev = v;
7259 spin_lock(&all_mddevs_lock);
7261 tmp = all_mddevs.next;
7263 tmp = mddev->all_mddevs.next;
7264 if (tmp != &all_mddevs)
7265 next_mddev = mddev_get(list_entry(tmp,struct mddev,all_mddevs));
7267 next_mddev = (void*)2;
7270 spin_unlock(&all_mddevs_lock);
7278 static void md_seq_stop(struct seq_file *seq, void *v)
7280 struct mddev *mddev = v;
7282 if (mddev && v != (void*)1 && v != (void*)2)
7286 static int md_seq_show(struct seq_file *seq, void *v)
7288 struct mddev *mddev = v;
7290 struct md_rdev *rdev;
7292 if (v == (void*)1) {
7293 struct md_personality *pers;
7294 seq_printf(seq, "Personalities : ");
7295 spin_lock(&pers_lock);
7296 list_for_each_entry(pers, &pers_list, list)
7297 seq_printf(seq, "[%s] ", pers->name);
7299 spin_unlock(&pers_lock);
7300 seq_printf(seq, "\n");
7301 seq->poll_event = atomic_read(&md_event_count);
7304 if (v == (void*)2) {
7309 spin_lock(&mddev->lock);
7310 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
7311 seq_printf(seq, "%s : %sactive", mdname(mddev),
7312 mddev->pers ? "" : "in");
7315 seq_printf(seq, " (read-only)");
7317 seq_printf(seq, " (auto-read-only)");
7318 seq_printf(seq, " %s", mddev->pers->name);
7323 rdev_for_each_rcu(rdev, mddev) {
7324 char b[BDEVNAME_SIZE];
7325 seq_printf(seq, " %s[%d]",
7326 bdevname(rdev->bdev,b), rdev->desc_nr);
7327 if (test_bit(WriteMostly, &rdev->flags))
7328 seq_printf(seq, "(W)");
7329 if (test_bit(Faulty, &rdev->flags)) {
7330 seq_printf(seq, "(F)");
7333 if (rdev->raid_disk < 0)
7334 seq_printf(seq, "(S)"); /* spare */
7335 if (test_bit(Replacement, &rdev->flags))
7336 seq_printf(seq, "(R)");
7337 sectors += rdev->sectors;
7341 if (!list_empty(&mddev->disks)) {
7343 seq_printf(seq, "\n %llu blocks",
7344 (unsigned long long)
7345 mddev->array_sectors / 2);
7347 seq_printf(seq, "\n %llu blocks",
7348 (unsigned long long)sectors / 2);
7350 if (mddev->persistent) {
7351 if (mddev->major_version != 0 ||
7352 mddev->minor_version != 90) {
7353 seq_printf(seq," super %d.%d",
7354 mddev->major_version,
7355 mddev->minor_version);
7357 } else if (mddev->external)
7358 seq_printf(seq, " super external:%s",
7359 mddev->metadata_type);
7361 seq_printf(seq, " super non-persistent");
7364 mddev->pers->status(seq, mddev);
7365 seq_printf(seq, "\n ");
7366 if (mddev->pers->sync_request) {
7367 if (status_resync(seq, mddev))
7368 seq_printf(seq, "\n ");
7371 seq_printf(seq, "\n ");
7373 bitmap_status(seq, mddev->bitmap);
7375 seq_printf(seq, "\n");
7377 spin_unlock(&mddev->lock);
7382 static const struct seq_operations md_seq_ops = {
7383 .start = md_seq_start,
7384 .next = md_seq_next,
7385 .stop = md_seq_stop,
7386 .show = md_seq_show,
7389 static int md_seq_open(struct inode *inode, struct file *file)
7391 struct seq_file *seq;
7394 error = seq_open(file, &md_seq_ops);
7398 seq = file->private_data;
7399 seq->poll_event = atomic_read(&md_event_count);
7403 static int md_unloading;
7404 static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
7406 struct seq_file *seq = filp->private_data;
7410 return POLLIN|POLLRDNORM|POLLERR|POLLPRI;
7411 poll_wait(filp, &md_event_waiters, wait);
7413 /* always allow read */
7414 mask = POLLIN | POLLRDNORM;
7416 if (seq->poll_event != atomic_read(&md_event_count))
7417 mask |= POLLERR | POLLPRI;
7421 static const struct file_operations md_seq_fops = {
7422 .owner = THIS_MODULE,
7423 .open = md_seq_open,
7425 .llseek = seq_lseek,
7426 .release = seq_release_private,
7427 .poll = mdstat_poll,
7430 int register_md_personality(struct md_personality *p)
7432 printk(KERN_INFO "md: %s personality registered for level %d\n",
7434 spin_lock(&pers_lock);
7435 list_add_tail(&p->list, &pers_list);
7436 spin_unlock(&pers_lock);
7439 EXPORT_SYMBOL(register_md_personality);
7441 int unregister_md_personality(struct md_personality *p)
7443 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
7444 spin_lock(&pers_lock);
7445 list_del_init(&p->list);
7446 spin_unlock(&pers_lock);
7449 EXPORT_SYMBOL(unregister_md_personality);
7451 int register_md_cluster_operations(struct md_cluster_operations *ops,
7452 struct module *module)
7455 spin_lock(&pers_lock);
7456 if (md_cluster_ops != NULL)
7459 md_cluster_ops = ops;
7460 md_cluster_mod = module;
7462 spin_unlock(&pers_lock);
7465 EXPORT_SYMBOL(register_md_cluster_operations);
7467 int unregister_md_cluster_operations(void)
7469 spin_lock(&pers_lock);
7470 md_cluster_ops = NULL;
7471 spin_unlock(&pers_lock);
7474 EXPORT_SYMBOL(unregister_md_cluster_operations);
7476 int md_setup_cluster(struct mddev *mddev, int nodes)
7480 err = request_module("md-cluster");
7482 pr_err("md-cluster module not found.\n");
7486 spin_lock(&pers_lock);
7487 if (!md_cluster_ops || !try_module_get(md_cluster_mod)) {
7488 spin_unlock(&pers_lock);
7491 spin_unlock(&pers_lock);
7493 return md_cluster_ops->join(mddev, nodes);
7496 void md_cluster_stop(struct mddev *mddev)
7498 if (!md_cluster_ops)
7500 md_cluster_ops->leave(mddev);
7501 module_put(md_cluster_mod);
7504 static int is_mddev_idle(struct mddev *mddev, int init)
7506 struct md_rdev *rdev;
7512 rdev_for_each_rcu(rdev, mddev) {
7513 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
7514 curr_events = (int)part_stat_read(&disk->part0, sectors[0]) +
7515 (int)part_stat_read(&disk->part0, sectors[1]) -
7516 atomic_read(&disk->sync_io);
7517 /* sync IO will cause sync_io to increase before the disk_stats
7518 * as sync_io is counted when a request starts, and
7519 * disk_stats is counted when it completes.
7520 * So resync activity will cause curr_events to be smaller than
7521 * when there was no such activity.
7522 * non-sync IO will cause disk_stat to increase without
7523 * increasing sync_io so curr_events will (eventually)
7524 * be larger than it was before. Once it becomes
7525 * substantially larger, the test below will cause
7526 * the array to appear non-idle, and resync will slow
7528 * If there is a lot of outstanding resync activity when
7529 * we set last_event to curr_events, then all that activity
7530 * completing might cause the array to appear non-idle
7531 * and resync will be slowed down even though there might
7532 * not have been non-resync activity. This will only
7533 * happen once though. 'last_events' will soon reflect
7534 * the state where there is little or no outstanding
7535 * resync requests, and further resync activity will
7536 * always make curr_events less than last_events.
7539 if (init || curr_events - rdev->last_events > 64) {
7540 rdev->last_events = curr_events;
7548 void md_done_sync(struct mddev *mddev, int blocks, int ok)
7550 /* another "blocks" (512byte) blocks have been synced */
7551 atomic_sub(blocks, &mddev->recovery_active);
7552 wake_up(&mddev->recovery_wait);
7554 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7555 set_bit(MD_RECOVERY_ERROR, &mddev->recovery);
7556 md_wakeup_thread(mddev->thread);
7557 // stop recovery, signal do_sync ....
7560 EXPORT_SYMBOL(md_done_sync);
7562 /* md_write_start(mddev, bi)
7563 * If we need to update some array metadata (e.g. 'active' flag
7564 * in superblock) before writing, schedule a superblock update
7565 * and wait for it to complete.
7567 void md_write_start(struct mddev *mddev, struct bio *bi)
7570 if (bio_data_dir(bi) != WRITE)
7573 BUG_ON(mddev->ro == 1);
7574 if (mddev->ro == 2) {
7575 /* need to switch to read/write */
7577 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7578 md_wakeup_thread(mddev->thread);
7579 md_wakeup_thread(mddev->sync_thread);
7582 atomic_inc(&mddev->writes_pending);
7583 if (mddev->safemode == 1)
7584 mddev->safemode = 0;
7585 if (mddev->in_sync) {
7586 spin_lock(&mddev->lock);
7587 if (mddev->in_sync) {
7589 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
7590 set_bit(MD_CHANGE_PENDING, &mddev->flags);
7591 md_wakeup_thread(mddev->thread);
7594 spin_unlock(&mddev->lock);
7597 sysfs_notify_dirent_safe(mddev->sysfs_state);
7598 wait_event(mddev->sb_wait,
7599 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
7601 EXPORT_SYMBOL(md_write_start);
7603 void md_write_end(struct mddev *mddev)
7605 if (atomic_dec_and_test(&mddev->writes_pending)) {
7606 if (mddev->safemode == 2)
7607 md_wakeup_thread(mddev->thread);
7608 else if (mddev->safemode_delay)
7609 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
7612 EXPORT_SYMBOL(md_write_end);
7614 /* md_allow_write(mddev)
7615 * Calling this ensures that the array is marked 'active' so that writes
7616 * may proceed without blocking. It is important to call this before
7617 * attempting a GFP_KERNEL allocation while holding the mddev lock.
7618 * Must be called with mddev_lock held.
7620 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
7621 * is dropped, so return -EAGAIN after notifying userspace.
7623 int md_allow_write(struct mddev *mddev)
7629 if (!mddev->pers->sync_request)
7632 spin_lock(&mddev->lock);
7633 if (mddev->in_sync) {
7635 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
7636 set_bit(MD_CHANGE_PENDING, &mddev->flags);
7637 if (mddev->safemode_delay &&
7638 mddev->safemode == 0)
7639 mddev->safemode = 1;
7640 spin_unlock(&mddev->lock);
7641 md_update_sb(mddev, 0);
7642 sysfs_notify_dirent_safe(mddev->sysfs_state);
7644 spin_unlock(&mddev->lock);
7646 if (test_bit(MD_CHANGE_PENDING, &mddev->flags))
7651 EXPORT_SYMBOL_GPL(md_allow_write);
7653 #define SYNC_MARKS 10
7654 #define SYNC_MARK_STEP (3*HZ)
7655 #define UPDATE_FREQUENCY (5*60*HZ)
7656 void md_do_sync(struct md_thread *thread)
7658 struct mddev *mddev = thread->mddev;
7659 struct mddev *mddev2;
7660 unsigned int currspeed = 0,
7662 sector_t max_sectors,j, io_sectors, recovery_done;
7663 unsigned long mark[SYNC_MARKS];
7664 unsigned long update_time;
7665 sector_t mark_cnt[SYNC_MARKS];
7667 struct list_head *tmp;
7668 sector_t last_check;
7670 struct md_rdev *rdev;
7671 char *desc, *action = NULL;
7672 struct blk_plug plug;
7673 bool cluster_resync_finished = false;
7675 /* just incase thread restarts... */
7676 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
7678 if (mddev->ro) {/* never try to sync a read-only array */
7679 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7683 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
7684 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) {
7685 desc = "data-check";
7687 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
7688 desc = "requested-resync";
7692 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
7697 mddev->last_sync_action = action ?: desc;
7699 /* we overload curr_resync somewhat here.
7700 * 0 == not engaged in resync at all
7701 * 2 == checking that there is no conflict with another sync
7702 * 1 == like 2, but have yielded to allow conflicting resync to
7704 * other == active in resync - this many blocks
7706 * Before starting a resync we must have set curr_resync to
7707 * 2, and then checked that every "conflicting" array has curr_resync
7708 * less than ours. When we find one that is the same or higher
7709 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
7710 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
7711 * This will mean we have to start checking from the beginning again.
7716 mddev->curr_resync = 2;
7719 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
7721 for_each_mddev(mddev2, tmp) {
7722 if (mddev2 == mddev)
7724 if (!mddev->parallel_resync
7725 && mddev2->curr_resync
7726 && match_mddev_units(mddev, mddev2)) {
7728 if (mddev < mddev2 && mddev->curr_resync == 2) {
7729 /* arbitrarily yield */
7730 mddev->curr_resync = 1;
7731 wake_up(&resync_wait);
7733 if (mddev > mddev2 && mddev->curr_resync == 1)
7734 /* no need to wait here, we can wait the next
7735 * time 'round when curr_resync == 2
7738 /* We need to wait 'interruptible' so as not to
7739 * contribute to the load average, and not to
7740 * be caught by 'softlockup'
7742 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
7743 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
7744 mddev2->curr_resync >= mddev->curr_resync) {
7745 printk(KERN_INFO "md: delaying %s of %s"
7746 " until %s has finished (they"
7747 " share one or more physical units)\n",
7748 desc, mdname(mddev), mdname(mddev2));
7750 if (signal_pending(current))
7751 flush_signals(current);
7753 finish_wait(&resync_wait, &wq);
7756 finish_wait(&resync_wait, &wq);
7759 } while (mddev->curr_resync < 2);
7762 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
7763 /* resync follows the size requested by the personality,
7764 * which defaults to physical size, but can be virtual size
7766 max_sectors = mddev->resync_max_sectors;
7767 atomic64_set(&mddev->resync_mismatches, 0);
7768 /* we don't use the checkpoint if there's a bitmap */
7769 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
7770 j = mddev->resync_min;
7771 else if (!mddev->bitmap)
7772 j = mddev->recovery_cp;
7774 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
7775 max_sectors = mddev->resync_max_sectors;
7777 /* recovery follows the physical size of devices */
7778 max_sectors = mddev->dev_sectors;
7781 rdev_for_each_rcu(rdev, mddev)
7782 if (rdev->raid_disk >= 0 &&
7783 !test_bit(Faulty, &rdev->flags) &&
7784 !test_bit(In_sync, &rdev->flags) &&
7785 rdev->recovery_offset < j)
7786 j = rdev->recovery_offset;
7789 /* If there is a bitmap, we need to make sure all
7790 * writes that started before we added a spare
7791 * complete before we start doing a recovery.
7792 * Otherwise the write might complete and (via
7793 * bitmap_endwrite) set a bit in the bitmap after the
7794 * recovery has checked that bit and skipped that
7797 if (mddev->bitmap) {
7798 mddev->pers->quiesce(mddev, 1);
7799 mddev->pers->quiesce(mddev, 0);
7803 printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev));
7804 printk(KERN_INFO "md: minimum _guaranteed_ speed:"
7805 " %d KB/sec/disk.\n", speed_min(mddev));
7806 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
7807 "(but not more than %d KB/sec) for %s.\n",
7808 speed_max(mddev), desc);
7810 is_mddev_idle(mddev, 1); /* this initializes IO event counters */
7813 for (m = 0; m < SYNC_MARKS; m++) {
7815 mark_cnt[m] = io_sectors;
7818 mddev->resync_mark = mark[last_mark];
7819 mddev->resync_mark_cnt = mark_cnt[last_mark];
7822 * Tune reconstruction:
7824 window = 32*(PAGE_SIZE/512);
7825 printk(KERN_INFO "md: using %dk window, over a total of %lluk.\n",
7826 window/2, (unsigned long long)max_sectors/2);
7828 atomic_set(&mddev->recovery_active, 0);
7833 "md: resuming %s of %s from checkpoint.\n",
7834 desc, mdname(mddev));
7835 mddev->curr_resync = j;
7837 mddev->curr_resync = 3; /* no longer delayed */
7838 mddev->curr_resync_completed = j;
7839 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
7840 md_new_event(mddev);
7841 update_time = jiffies;
7843 blk_start_plug(&plug);
7844 while (j < max_sectors) {
7849 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
7850 ((mddev->curr_resync > mddev->curr_resync_completed &&
7851 (mddev->curr_resync - mddev->curr_resync_completed)
7852 > (max_sectors >> 4)) ||
7853 time_after_eq(jiffies, update_time + UPDATE_FREQUENCY) ||
7854 (j - mddev->curr_resync_completed)*2
7855 >= mddev->resync_max - mddev->curr_resync_completed ||
7856 mddev->curr_resync_completed > mddev->resync_max
7858 /* time to update curr_resync_completed */
7859 wait_event(mddev->recovery_wait,
7860 atomic_read(&mddev->recovery_active) == 0);
7861 mddev->curr_resync_completed = j;
7862 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) &&
7863 j > mddev->recovery_cp)
7864 mddev->recovery_cp = j;
7865 update_time = jiffies;
7866 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
7867 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
7870 while (j >= mddev->resync_max &&
7871 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
7872 /* As this condition is controlled by user-space,
7873 * we can block indefinitely, so use '_interruptible'
7874 * to avoid triggering warnings.
7876 flush_signals(current); /* just in case */
7877 wait_event_interruptible(mddev->recovery_wait,
7878 mddev->resync_max > j
7879 || test_bit(MD_RECOVERY_INTR,
7883 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
7886 sectors = mddev->pers->sync_request(mddev, j, &skipped);
7888 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7892 if (!skipped) { /* actual IO requested */
7893 io_sectors += sectors;
7894 atomic_add(sectors, &mddev->recovery_active);
7897 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
7901 if (j > max_sectors)
7902 /* when skipping, extra large numbers can be returned. */
7905 mddev->curr_resync = j;
7906 mddev->curr_mark_cnt = io_sectors;
7907 if (last_check == 0)
7908 /* this is the earliest that rebuild will be
7909 * visible in /proc/mdstat
7911 md_new_event(mddev);
7913 if (last_check + window > io_sectors || j == max_sectors)
7916 last_check = io_sectors;
7918 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
7920 int next = (last_mark+1) % SYNC_MARKS;
7922 mddev->resync_mark = mark[next];
7923 mddev->resync_mark_cnt = mark_cnt[next];
7924 mark[next] = jiffies;
7925 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
7929 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
7933 * this loop exits only if either when we are slower than
7934 * the 'hard' speed limit, or the system was IO-idle for
7936 * the system might be non-idle CPU-wise, but we only care
7937 * about not overloading the IO subsystem. (things like an
7938 * e2fsck being done on the RAID array should execute fast)
7942 recovery_done = io_sectors - atomic_read(&mddev->recovery_active);
7943 currspeed = ((unsigned long)(recovery_done - mddev->resync_mark_cnt))/2
7944 /((jiffies-mddev->resync_mark)/HZ +1) +1;
7946 if (currspeed > speed_min(mddev)) {
7947 if (currspeed > speed_max(mddev)) {
7951 if (!is_mddev_idle(mddev, 0)) {
7953 * Give other IO more of a chance.
7954 * The faster the devices, the less we wait.
7956 wait_event(mddev->recovery_wait,
7957 !atomic_read(&mddev->recovery_active));
7961 printk(KERN_INFO "md: %s: %s %s.\n",mdname(mddev), desc,
7962 test_bit(MD_RECOVERY_INTR, &mddev->recovery)
7963 ? "interrupted" : "done");
7965 * this also signals 'finished resyncing' to md_stop
7967 blk_finish_plug(&plug);
7968 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
7970 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
7971 !test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
7972 mddev->curr_resync > 2) {
7973 mddev->curr_resync_completed = mddev->curr_resync;
7974 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
7976 /* tell personality and other nodes that we are finished */
7977 if (mddev_is_clustered(mddev)) {
7978 md_cluster_ops->resync_finish(mddev);
7979 cluster_resync_finished = true;
7981 mddev->pers->sync_request(mddev, max_sectors, &skipped);
7983 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
7984 mddev->curr_resync > 2) {
7985 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
7986 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
7987 if (mddev->curr_resync >= mddev->recovery_cp) {
7989 "md: checkpointing %s of %s.\n",
7990 desc, mdname(mddev));
7991 if (test_bit(MD_RECOVERY_ERROR,
7993 mddev->recovery_cp =
7994 mddev->curr_resync_completed;
7996 mddev->recovery_cp =
8000 mddev->recovery_cp = MaxSector;
8002 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8003 mddev->curr_resync = MaxSector;
8005 rdev_for_each_rcu(rdev, mddev)
8006 if (rdev->raid_disk >= 0 &&
8007 mddev->delta_disks >= 0 &&
8008 !test_bit(Faulty, &rdev->flags) &&
8009 !test_bit(In_sync, &rdev->flags) &&
8010 rdev->recovery_offset < mddev->curr_resync)
8011 rdev->recovery_offset = mddev->curr_resync;
8016 set_bit(MD_CHANGE_DEVS, &mddev->flags);
8018 if (mddev_is_clustered(mddev) &&
8019 test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8020 !cluster_resync_finished)
8021 md_cluster_ops->resync_finish(mddev);
8023 spin_lock(&mddev->lock);
8024 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
8025 /* We completed so min/max setting can be forgotten if used. */
8026 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
8027 mddev->resync_min = 0;
8028 mddev->resync_max = MaxSector;
8029 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
8030 mddev->resync_min = mddev->curr_resync_completed;
8031 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
8032 mddev->curr_resync = 0;
8033 spin_unlock(&mddev->lock);
8035 wake_up(&resync_wait);
8036 md_wakeup_thread(mddev->thread);
8039 EXPORT_SYMBOL_GPL(md_do_sync);
8041 static int remove_and_add_spares(struct mddev *mddev,
8042 struct md_rdev *this)
8044 struct md_rdev *rdev;
8048 rdev_for_each(rdev, mddev)
8049 if ((this == NULL || rdev == this) &&
8050 rdev->raid_disk >= 0 &&
8051 !test_bit(Blocked, &rdev->flags) &&
8052 (test_bit(Faulty, &rdev->flags) ||
8053 ! test_bit(In_sync, &rdev->flags)) &&
8054 atomic_read(&rdev->nr_pending)==0) {
8055 if (mddev->pers->hot_remove_disk(
8056 mddev, rdev) == 0) {
8057 sysfs_unlink_rdev(mddev, rdev);
8058 rdev->raid_disk = -1;
8062 if (removed && mddev->kobj.sd)
8063 sysfs_notify(&mddev->kobj, NULL, "degraded");
8065 if (this && removed)
8068 rdev_for_each(rdev, mddev) {
8069 if (this && this != rdev)
8071 if (test_bit(Candidate, &rdev->flags))
8073 if (rdev->raid_disk >= 0 &&
8074 !test_bit(In_sync, &rdev->flags) &&
8075 !test_bit(Faulty, &rdev->flags))
8077 if (rdev->raid_disk >= 0)
8079 if (test_bit(Faulty, &rdev->flags))
8082 ! (rdev->saved_raid_disk >= 0 &&
8083 !test_bit(Bitmap_sync, &rdev->flags)))
8086 if (rdev->saved_raid_disk < 0)
8087 rdev->recovery_offset = 0;
8089 hot_add_disk(mddev, rdev) == 0) {
8090 if (sysfs_link_rdev(mddev, rdev))
8091 /* failure here is OK */;
8093 md_new_event(mddev);
8094 set_bit(MD_CHANGE_DEVS, &mddev->flags);
8099 set_bit(MD_CHANGE_DEVS, &mddev->flags);
8103 static void md_start_sync(struct work_struct *ws)
8105 struct mddev *mddev = container_of(ws, struct mddev, del_work);
8108 if (mddev_is_clustered(mddev)) {
8109 ret = md_cluster_ops->resync_start(mddev);
8111 mddev->sync_thread = NULL;
8116 mddev->sync_thread = md_register_thread(md_do_sync,
8120 if (!mddev->sync_thread) {
8121 if (!(mddev_is_clustered(mddev) && ret == -EAGAIN))
8122 printk(KERN_ERR "%s: could not start resync"
8125 /* leave the spares where they are, it shouldn't hurt */
8126 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8127 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
8128 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
8129 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
8130 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
8131 wake_up(&resync_wait);
8132 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
8134 if (mddev->sysfs_action)
8135 sysfs_notify_dirent_safe(mddev->sysfs_action);
8137 md_wakeup_thread(mddev->sync_thread);
8138 sysfs_notify_dirent_safe(mddev->sysfs_action);
8139 md_new_event(mddev);
8143 * This routine is regularly called by all per-raid-array threads to
8144 * deal with generic issues like resync and super-block update.
8145 * Raid personalities that don't have a thread (linear/raid0) do not
8146 * need this as they never do any recovery or update the superblock.
8148 * It does not do any resync itself, but rather "forks" off other threads
8149 * to do that as needed.
8150 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
8151 * "->recovery" and create a thread at ->sync_thread.
8152 * When the thread finishes it sets MD_RECOVERY_DONE
8153 * and wakeups up this thread which will reap the thread and finish up.
8154 * This thread also removes any faulty devices (with nr_pending == 0).
8156 * The overall approach is:
8157 * 1/ if the superblock needs updating, update it.
8158 * 2/ If a recovery thread is running, don't do anything else.
8159 * 3/ If recovery has finished, clean up, possibly marking spares active.
8160 * 4/ If there are any faulty devices, remove them.
8161 * 5/ If array is degraded, try to add spares devices
8162 * 6/ If array has spares or is not in-sync, start a resync thread.
8164 void md_check_recovery(struct mddev *mddev)
8166 if (mddev->suspended)
8170 bitmap_daemon_work(mddev);
8172 if (signal_pending(current)) {
8173 if (mddev->pers->sync_request && !mddev->external) {
8174 printk(KERN_INFO "md: %s in immediate safe mode\n",
8176 mddev->safemode = 2;
8178 flush_signals(current);
8181 if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
8184 (mddev->flags & MD_UPDATE_SB_FLAGS & ~ (1<<MD_CHANGE_PENDING)) ||
8185 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
8186 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
8187 (mddev->external == 0 && mddev->safemode == 1) ||
8188 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
8189 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
8193 if (mddev_trylock(mddev)) {
8197 struct md_rdev *rdev;
8198 if (!mddev->external && mddev->in_sync)
8199 /* 'Blocked' flag not needed as failed devices
8200 * will be recorded if array switched to read/write.
8201 * Leaving it set will prevent the device
8202 * from being removed.
8204 rdev_for_each(rdev, mddev)
8205 clear_bit(Blocked, &rdev->flags);
8206 /* On a read-only array we can:
8207 * - remove failed devices
8208 * - add already-in_sync devices if the array itself
8210 * As we only add devices that are already in-sync,
8211 * we can activate the spares immediately.
8213 remove_and_add_spares(mddev, NULL);
8214 /* There is no thread, but we need to call
8215 * ->spare_active and clear saved_raid_disk
8217 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8218 md_reap_sync_thread(mddev);
8219 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8220 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8221 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
8225 if (!mddev->external) {
8227 spin_lock(&mddev->lock);
8228 if (mddev->safemode &&
8229 !atomic_read(&mddev->writes_pending) &&
8231 mddev->recovery_cp == MaxSector) {
8234 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
8236 if (mddev->safemode == 1)
8237 mddev->safemode = 0;
8238 spin_unlock(&mddev->lock);
8240 sysfs_notify_dirent_safe(mddev->sysfs_state);
8243 if (mddev->flags & MD_UPDATE_SB_FLAGS)
8244 md_update_sb(mddev, 0);
8246 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
8247 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
8248 /* resync/recovery still happening */
8249 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8252 if (mddev->sync_thread) {
8253 md_reap_sync_thread(mddev);
8256 /* Set RUNNING before clearing NEEDED to avoid
8257 * any transients in the value of "sync_action".
8259 mddev->curr_resync_completed = 0;
8260 spin_lock(&mddev->lock);
8261 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
8262 spin_unlock(&mddev->lock);
8263 /* Clear some bits that don't mean anything, but
8266 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
8267 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
8269 if (!test_and_clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
8270 test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
8272 /* no recovery is running.
8273 * remove any failed drives, then
8274 * add spares if possible.
8275 * Spares are also removed and re-added, to allow
8276 * the personality to fail the re-add.
8279 if (mddev->reshape_position != MaxSector) {
8280 if (mddev->pers->check_reshape == NULL ||
8281 mddev->pers->check_reshape(mddev) != 0)
8282 /* Cannot proceed */
8284 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
8285 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8286 } else if ((spares = remove_and_add_spares(mddev, NULL))) {
8287 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8288 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
8289 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
8290 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8291 } else if (mddev->recovery_cp < MaxSector) {
8292 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8293 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8294 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
8295 /* nothing to be done ... */
8298 if (mddev->pers->sync_request) {
8300 /* We are adding a device or devices to an array
8301 * which has the bitmap stored on all devices.
8302 * So make sure all bitmap pages get written
8304 bitmap_write_all(mddev->bitmap);
8306 INIT_WORK(&mddev->del_work, md_start_sync);
8307 queue_work(md_misc_wq, &mddev->del_work);
8311 if (!mddev->sync_thread) {
8312 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
8313 wake_up(&resync_wait);
8314 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
8316 if (mddev->sysfs_action)
8317 sysfs_notify_dirent_safe(mddev->sysfs_action);
8320 wake_up(&mddev->sb_wait);
8321 mddev_unlock(mddev);
8324 EXPORT_SYMBOL(md_check_recovery);
8326 void md_reap_sync_thread(struct mddev *mddev)
8328 struct md_rdev *rdev;
8330 /* resync has finished, collect result */
8331 md_unregister_thread(&mddev->sync_thread);
8332 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8333 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
8335 /* activate any spares */
8336 if (mddev->pers->spare_active(mddev)) {
8337 sysfs_notify(&mddev->kobj, NULL,
8339 set_bit(MD_CHANGE_DEVS, &mddev->flags);
8342 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8343 mddev->pers->finish_reshape)
8344 mddev->pers->finish_reshape(mddev);
8346 /* If array is no-longer degraded, then any saved_raid_disk
8347 * information must be scrapped.
8349 if (!mddev->degraded)
8350 rdev_for_each(rdev, mddev)
8351 rdev->saved_raid_disk = -1;
8353 md_update_sb(mddev, 1);
8354 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
8355 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
8356 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8357 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
8358 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
8359 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
8360 wake_up(&resync_wait);
8361 /* flag recovery needed just to double check */
8362 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8363 sysfs_notify_dirent_safe(mddev->sysfs_action);
8364 md_new_event(mddev);
8365 if (mddev->event_work.func)
8366 queue_work(md_misc_wq, &mddev->event_work);
8368 EXPORT_SYMBOL(md_reap_sync_thread);
8370 void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev)
8372 sysfs_notify_dirent_safe(rdev->sysfs_state);
8373 wait_event_timeout(rdev->blocked_wait,
8374 !test_bit(Blocked, &rdev->flags) &&
8375 !test_bit(BlockedBadBlocks, &rdev->flags),
8376 msecs_to_jiffies(5000));
8377 rdev_dec_pending(rdev, mddev);
8379 EXPORT_SYMBOL(md_wait_for_blocked_rdev);
8381 void md_finish_reshape(struct mddev *mddev)
8383 /* called be personality module when reshape completes. */
8384 struct md_rdev *rdev;
8386 rdev_for_each(rdev, mddev) {
8387 if (rdev->data_offset > rdev->new_data_offset)
8388 rdev->sectors += rdev->data_offset - rdev->new_data_offset;
8390 rdev->sectors -= rdev->new_data_offset - rdev->data_offset;
8391 rdev->data_offset = rdev->new_data_offset;
8394 EXPORT_SYMBOL(md_finish_reshape);
8396 /* Bad block management.
8397 * We can record which blocks on each device are 'bad' and so just
8398 * fail those blocks, or that stripe, rather than the whole device.
8399 * Entries in the bad-block table are 64bits wide. This comprises:
8400 * Length of bad-range, in sectors: 0-511 for lengths 1-512
8401 * Start of bad-range, sector offset, 54 bits (allows 8 exbibytes)
8402 * A 'shift' can be set so that larger blocks are tracked and
8403 * consequently larger devices can be covered.
8404 * 'Acknowledged' flag - 1 bit. - the most significant bit.
8406 * Locking of the bad-block table uses a seqlock so md_is_badblock
8407 * might need to retry if it is very unlucky.
8408 * We will sometimes want to check for bad blocks in a bi_end_io function,
8409 * so we use the write_seqlock_irq variant.
8411 * When looking for a bad block we specify a range and want to
8412 * know if any block in the range is bad. So we binary-search
8413 * to the last range that starts at-or-before the given endpoint,
8414 * (or "before the sector after the target range")
8415 * then see if it ends after the given start.
8417 * 0 if there are no known bad blocks in the range
8418 * 1 if there are known bad block which are all acknowledged
8419 * -1 if there are bad blocks which have not yet been acknowledged in metadata.
8420 * plus the start/length of the first bad section we overlap.
8422 int md_is_badblock(struct badblocks *bb, sector_t s, int sectors,
8423 sector_t *first_bad, int *bad_sectors)
8429 sector_t target = s + sectors;
8432 if (bb->shift > 0) {
8433 /* round the start down, and the end up */
8435 target += (1<<bb->shift) - 1;
8436 target >>= bb->shift;
8437 sectors = target - s;
8439 /* 'target' is now the first block after the bad range */
8442 seq = read_seqbegin(&bb->lock);
8447 /* Binary search between lo and hi for 'target'
8448 * i.e. for the last range that starts before 'target'
8450 /* INVARIANT: ranges before 'lo' and at-or-after 'hi'
8451 * are known not to be the last range before target.
8452 * VARIANT: hi-lo is the number of possible
8453 * ranges, and decreases until it reaches 1
8455 while (hi - lo > 1) {
8456 int mid = (lo + hi) / 2;
8457 sector_t a = BB_OFFSET(p[mid]);
8459 /* This could still be the one, earlier ranges
8463 /* This and later ranges are definitely out. */
8466 /* 'lo' might be the last that started before target, but 'hi' isn't */
8468 /* need to check all range that end after 's' to see if
8469 * any are unacknowledged.
8472 BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) {
8473 if (BB_OFFSET(p[lo]) < target) {
8474 /* starts before the end, and finishes after
8475 * the start, so they must overlap
8477 if (rv != -1 && BB_ACK(p[lo]))
8481 *first_bad = BB_OFFSET(p[lo]);
8482 *bad_sectors = BB_LEN(p[lo]);
8488 if (read_seqretry(&bb->lock, seq))
8493 EXPORT_SYMBOL_GPL(md_is_badblock);
8496 * Add a range of bad blocks to the table.
8497 * This might extend the table, or might contract it
8498 * if two adjacent ranges can be merged.
8499 * We binary-search to find the 'insertion' point, then
8500 * decide how best to handle it.
8502 static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors,
8508 unsigned long flags;
8511 /* badblocks are disabled */
8515 /* round the start down, and the end up */
8516 sector_t next = s + sectors;
8518 next += (1<<bb->shift) - 1;
8523 write_seqlock_irqsave(&bb->lock, flags);
8528 /* Find the last range that starts at-or-before 's' */
8529 while (hi - lo > 1) {
8530 int mid = (lo + hi) / 2;
8531 sector_t a = BB_OFFSET(p[mid]);
8537 if (hi > lo && BB_OFFSET(p[lo]) > s)
8541 /* we found a range that might merge with the start
8544 sector_t a = BB_OFFSET(p[lo]);
8545 sector_t e = a + BB_LEN(p[lo]);
8546 int ack = BB_ACK(p[lo]);
8548 /* Yes, we can merge with a previous range */
8549 if (s == a && s + sectors >= e)
8550 /* new range covers old */
8553 ack = ack && acknowledged;
8555 if (e < s + sectors)
8557 if (e - a <= BB_MAX_LEN) {
8558 p[lo] = BB_MAKE(a, e-a, ack);
8561 /* does not all fit in one range,
8562 * make p[lo] maximal
8564 if (BB_LEN(p[lo]) != BB_MAX_LEN)
8565 p[lo] = BB_MAKE(a, BB_MAX_LEN, ack);
8571 if (sectors && hi < bb->count) {
8572 /* 'hi' points to the first range that starts after 's'.
8573 * Maybe we can merge with the start of that range */
8574 sector_t a = BB_OFFSET(p[hi]);
8575 sector_t e = a + BB_LEN(p[hi]);
8576 int ack = BB_ACK(p[hi]);
8577 if (a <= s + sectors) {
8578 /* merging is possible */
8579 if (e <= s + sectors) {
8584 ack = ack && acknowledged;
8587 if (e - a <= BB_MAX_LEN) {
8588 p[hi] = BB_MAKE(a, e-a, ack);
8591 p[hi] = BB_MAKE(a, BB_MAX_LEN, ack);
8599 if (sectors == 0 && hi < bb->count) {
8600 /* we might be able to combine lo and hi */
8601 /* Note: 's' is at the end of 'lo' */
8602 sector_t a = BB_OFFSET(p[hi]);
8603 int lolen = BB_LEN(p[lo]);
8604 int hilen = BB_LEN(p[hi]);
8605 int newlen = lolen + hilen - (s - a);
8606 if (s >= a && newlen < BB_MAX_LEN) {
8607 /* yes, we can combine them */
8608 int ack = BB_ACK(p[lo]) && BB_ACK(p[hi]);
8609 p[lo] = BB_MAKE(BB_OFFSET(p[lo]), newlen, ack);
8610 memmove(p + hi, p + hi + 1,
8611 (bb->count - hi - 1) * 8);
8616 /* didn't merge (it all).
8617 * Need to add a range just before 'hi' */
8618 if (bb->count >= MD_MAX_BADBLOCKS) {
8619 /* No room for more */
8623 int this_sectors = sectors;
8624 memmove(p + hi + 1, p + hi,
8625 (bb->count - hi) * 8);
8628 if (this_sectors > BB_MAX_LEN)
8629 this_sectors = BB_MAX_LEN;
8630 p[hi] = BB_MAKE(s, this_sectors, acknowledged);
8631 sectors -= this_sectors;
8638 bb->unacked_exist = 1;
8639 write_sequnlock_irqrestore(&bb->lock, flags);
8644 int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
8649 s += rdev->new_data_offset;
8651 s += rdev->data_offset;
8652 rv = md_set_badblocks(&rdev->badblocks,
8655 /* Make sure they get written out promptly */
8656 sysfs_notify_dirent_safe(rdev->sysfs_state);
8657 set_bit(MD_CHANGE_CLEAN, &rdev->mddev->flags);
8658 set_bit(MD_CHANGE_PENDING, &rdev->mddev->flags);
8659 md_wakeup_thread(rdev->mddev->thread);
8663 EXPORT_SYMBOL_GPL(rdev_set_badblocks);
8666 * Remove a range of bad blocks from the table.
8667 * This may involve extending the table if we spilt a region,
8668 * but it must not fail. So if the table becomes full, we just
8669 * drop the remove request.
8671 static int md_clear_badblocks(struct badblocks *bb, sector_t s, int sectors)
8675 sector_t target = s + sectors;
8678 if (bb->shift > 0) {
8679 /* When clearing we round the start up and the end down.
8680 * This should not matter as the shift should align with
8681 * the block size and no rounding should ever be needed.
8682 * However it is better the think a block is bad when it
8683 * isn't than to think a block is not bad when it is.
8685 s += (1<<bb->shift) - 1;
8687 target >>= bb->shift;
8688 sectors = target - s;
8691 write_seqlock_irq(&bb->lock);
8696 /* Find the last range that starts before 'target' */
8697 while (hi - lo > 1) {
8698 int mid = (lo + hi) / 2;
8699 sector_t a = BB_OFFSET(p[mid]);
8706 /* p[lo] is the last range that could overlap the
8707 * current range. Earlier ranges could also overlap,
8708 * but only this one can overlap the end of the range.
8710 if (BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > target) {
8711 /* Partial overlap, leave the tail of this range */
8712 int ack = BB_ACK(p[lo]);
8713 sector_t a = BB_OFFSET(p[lo]);
8714 sector_t end = a + BB_LEN(p[lo]);
8717 /* we need to split this range */
8718 if (bb->count >= MD_MAX_BADBLOCKS) {
8722 memmove(p+lo+1, p+lo, (bb->count - lo) * 8);
8724 p[lo] = BB_MAKE(a, s-a, ack);
8727 p[lo] = BB_MAKE(target, end - target, ack);
8728 /* there is no longer an overlap */
8733 BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) {
8734 /* This range does overlap */
8735 if (BB_OFFSET(p[lo]) < s) {
8736 /* Keep the early parts of this range. */
8737 int ack = BB_ACK(p[lo]);
8738 sector_t start = BB_OFFSET(p[lo]);
8739 p[lo] = BB_MAKE(start, s - start, ack);
8740 /* now low doesn't overlap, so.. */
8745 /* 'lo' is strictly before, 'hi' is strictly after,
8746 * anything between needs to be discarded
8749 memmove(p+lo+1, p+hi, (bb->count - hi) * 8);
8750 bb->count -= (hi - lo - 1);
8756 write_sequnlock_irq(&bb->lock);
8760 int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
8764 s += rdev->new_data_offset;
8766 s += rdev->data_offset;
8767 return md_clear_badblocks(&rdev->badblocks,
8770 EXPORT_SYMBOL_GPL(rdev_clear_badblocks);
8773 * Acknowledge all bad blocks in a list.
8774 * This only succeeds if ->changed is clear. It is used by
8775 * in-kernel metadata updates
8777 void md_ack_all_badblocks(struct badblocks *bb)
8779 if (bb->page == NULL || bb->changed)
8780 /* no point even trying */
8782 write_seqlock_irq(&bb->lock);
8784 if (bb->changed == 0 && bb->unacked_exist) {
8787 for (i = 0; i < bb->count ; i++) {
8788 if (!BB_ACK(p[i])) {
8789 sector_t start = BB_OFFSET(p[i]);
8790 int len = BB_LEN(p[i]);
8791 p[i] = BB_MAKE(start, len, 1);
8794 bb->unacked_exist = 0;
8796 write_sequnlock_irq(&bb->lock);
8798 EXPORT_SYMBOL_GPL(md_ack_all_badblocks);
8800 /* sysfs access to bad-blocks list.
8801 * We present two files.
8802 * 'bad-blocks' lists sector numbers and lengths of ranges that
8803 * are recorded as bad. The list is truncated to fit within
8804 * the one-page limit of sysfs.
8805 * Writing "sector length" to this file adds an acknowledged
8807 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
8808 * been acknowledged. Writing to this file adds bad blocks
8809 * without acknowledging them. This is largely for testing.
8813 badblocks_show(struct badblocks *bb, char *page, int unack)
8824 seq = read_seqbegin(&bb->lock);
8829 while (len < PAGE_SIZE && i < bb->count) {
8830 sector_t s = BB_OFFSET(p[i]);
8831 unsigned int length = BB_LEN(p[i]);
8832 int ack = BB_ACK(p[i]);
8838 len += snprintf(page+len, PAGE_SIZE-len, "%llu %u\n",
8839 (unsigned long long)s << bb->shift,
8840 length << bb->shift);
8842 if (unack && len == 0)
8843 bb->unacked_exist = 0;
8845 if (read_seqretry(&bb->lock, seq))
8854 badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack)
8856 unsigned long long sector;
8860 /* Allow clearing via sysfs *only* for testing/debugging.
8861 * Normally only a successful write may clear a badblock
8864 if (page[0] == '-') {
8868 #endif /* DO_DEBUG */
8870 switch (sscanf(page, "%llu %d%c", §or, &length, &newline)) {
8872 if (newline != '\n')
8884 md_clear_badblocks(bb, sector, length);
8887 #endif /* DO_DEBUG */
8888 if (md_set_badblocks(bb, sector, length, !unack))
8894 static int md_notify_reboot(struct notifier_block *this,
8895 unsigned long code, void *x)
8897 struct list_head *tmp;
8898 struct mddev *mddev;
8901 for_each_mddev(mddev, tmp) {
8902 if (mddev_trylock(mddev)) {
8904 __md_stop_writes(mddev);
8905 if (mddev->persistent)
8906 mddev->safemode = 2;
8907 mddev_unlock(mddev);
8912 * certain more exotic SCSI devices are known to be
8913 * volatile wrt too early system reboots. While the
8914 * right place to handle this issue is the given
8915 * driver, we do want to have a safe RAID driver ...
8923 static struct notifier_block md_notifier = {
8924 .notifier_call = md_notify_reboot,
8926 .priority = INT_MAX, /* before any real devices */
8929 static void md_geninit(void)
8931 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
8933 proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops);
8936 static int __init md_init(void)
8940 md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0);
8944 md_misc_wq = alloc_workqueue("md_misc", 0, 0);
8948 if ((ret = register_blkdev(MD_MAJOR, "md")) < 0)
8951 if ((ret = register_blkdev(0, "mdp")) < 0)
8955 blk_register_region(MKDEV(MD_MAJOR, 0), 512, THIS_MODULE,
8956 md_probe, NULL, NULL);
8957 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
8958 md_probe, NULL, NULL);
8960 register_reboot_notifier(&md_notifier);
8961 raid_table_header = register_sysctl_table(raid_root_table);
8967 unregister_blkdev(MD_MAJOR, "md");
8969 destroy_workqueue(md_misc_wq);
8971 destroy_workqueue(md_wq);
8976 static void check_sb_changes(struct mddev *mddev, struct md_rdev *rdev)
8978 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
8979 struct md_rdev *rdev2;
8981 char b[BDEVNAME_SIZE];
8983 /* Check for change of roles in the active devices */
8984 rdev_for_each(rdev2, mddev) {
8985 if (test_bit(Faulty, &rdev2->flags))
8988 /* Check if the roles changed */
8989 role = le16_to_cpu(sb->dev_roles[rdev2->desc_nr]);
8991 if (test_bit(Candidate, &rdev2->flags)) {
8992 if (role == 0xfffe) {
8993 pr_info("md: Removing Candidate device %s because add failed\n", bdevname(rdev2->bdev,b));
8994 md_kick_rdev_from_array(rdev2);
8998 clear_bit(Candidate, &rdev2->flags);
9001 if (role != rdev2->raid_disk) {
9003 if (rdev2->raid_disk == -1 && role != 0xffff) {
9004 rdev2->saved_raid_disk = role;
9005 ret = remove_and_add_spares(mddev, rdev2);
9006 pr_info("Activated spare: %s\n",
9007 bdevname(rdev2->bdev,b));
9011 * We just want to do the minimum to mark the disk
9012 * as faulty. The recovery is performed by the
9013 * one who initiated the error.
9015 if ((role == 0xfffe) || (role == 0xfffd)) {
9016 md_error(mddev, rdev2);
9017 clear_bit(Blocked, &rdev2->flags);
9022 if (mddev->raid_disks != le32_to_cpu(sb->raid_disks))
9023 update_raid_disks(mddev, le32_to_cpu(sb->raid_disks));
9025 /* Finally set the event to be up to date */
9026 mddev->events = le64_to_cpu(sb->events);
9029 static int read_rdev(struct mddev *mddev, struct md_rdev *rdev)
9032 struct page *swapout = rdev->sb_page;
9033 struct mdp_superblock_1 *sb;
9035 /* Store the sb page of the rdev in the swapout temporary
9036 * variable in case we err in the future
9038 rdev->sb_page = NULL;
9039 alloc_disk_sb(rdev);
9040 ClearPageUptodate(rdev->sb_page);
9041 rdev->sb_loaded = 0;
9042 err = super_types[mddev->major_version].load_super(rdev, NULL, mddev->minor_version);
9045 pr_warn("%s: %d Could not reload rdev(%d) err: %d. Restoring old values\n",
9046 __func__, __LINE__, rdev->desc_nr, err);
9047 put_page(rdev->sb_page);
9048 rdev->sb_page = swapout;
9049 rdev->sb_loaded = 1;
9053 sb = page_address(rdev->sb_page);
9054 /* Read the offset unconditionally, even if MD_FEATURE_RECOVERY_OFFSET
9058 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RECOVERY_OFFSET))
9059 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
9061 /* The other node finished recovery, call spare_active to set
9062 * device In_sync and mddev->degraded
9064 if (rdev->recovery_offset == MaxSector &&
9065 !test_bit(In_sync, &rdev->flags) &&
9066 mddev->pers->spare_active(mddev))
9067 sysfs_notify(&mddev->kobj, NULL, "degraded");
9073 void md_reload_sb(struct mddev *mddev, int nr)
9075 struct md_rdev *rdev;
9079 rdev_for_each_rcu(rdev, mddev) {
9080 if (rdev->desc_nr == nr)
9084 if (!rdev || rdev->desc_nr != nr) {
9085 pr_warn("%s: %d Could not find rdev with nr %d\n", __func__, __LINE__, nr);
9089 err = read_rdev(mddev, rdev);
9093 check_sb_changes(mddev, rdev);
9095 /* Read all rdev's to update recovery_offset */
9096 rdev_for_each_rcu(rdev, mddev)
9097 read_rdev(mddev, rdev);
9099 EXPORT_SYMBOL(md_reload_sb);
9104 * Searches all registered partitions for autorun RAID arrays
9108 static LIST_HEAD(all_detected_devices);
9109 struct detected_devices_node {
9110 struct list_head list;
9114 void md_autodetect_dev(dev_t dev)
9116 struct detected_devices_node *node_detected_dev;
9118 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
9119 if (node_detected_dev) {
9120 node_detected_dev->dev = dev;
9121 list_add_tail(&node_detected_dev->list, &all_detected_devices);
9123 printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed"
9124 ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev));
9128 static void autostart_arrays(int part)
9130 struct md_rdev *rdev;
9131 struct detected_devices_node *node_detected_dev;
9133 int i_scanned, i_passed;
9138 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
9140 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
9142 node_detected_dev = list_entry(all_detected_devices.next,
9143 struct detected_devices_node, list);
9144 list_del(&node_detected_dev->list);
9145 dev = node_detected_dev->dev;
9146 kfree(node_detected_dev);
9147 rdev = md_import_device(dev,0, 90);
9151 if (test_bit(Faulty, &rdev->flags))
9154 set_bit(AutoDetected, &rdev->flags);
9155 list_add(&rdev->same_set, &pending_raid_disks);
9159 printk(KERN_INFO "md: Scanned %d and added %d devices.\n",
9160 i_scanned, i_passed);
9162 autorun_devices(part);
9165 #endif /* !MODULE */
9167 static __exit void md_exit(void)
9169 struct mddev *mddev;
9170 struct list_head *tmp;
9173 blk_unregister_region(MKDEV(MD_MAJOR,0), 512);
9174 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
9176 unregister_blkdev(MD_MAJOR,"md");
9177 unregister_blkdev(mdp_major, "mdp");
9178 unregister_reboot_notifier(&md_notifier);
9179 unregister_sysctl_table(raid_table_header);
9181 /* We cannot unload the modules while some process is
9182 * waiting for us in select() or poll() - wake them up
9185 while (waitqueue_active(&md_event_waiters)) {
9186 /* not safe to leave yet */
9187 wake_up(&md_event_waiters);
9191 remove_proc_entry("mdstat", NULL);
9193 for_each_mddev(mddev, tmp) {
9194 export_array(mddev);
9195 mddev->hold_active = 0;
9197 destroy_workqueue(md_misc_wq);
9198 destroy_workqueue(md_wq);
9201 subsys_initcall(md_init);
9202 module_exit(md_exit)
9204 static int get_ro(char *buffer, struct kernel_param *kp)
9206 return sprintf(buffer, "%d", start_readonly);
9208 static int set_ro(const char *val, struct kernel_param *kp)
9210 return kstrtouint(val, 10, (unsigned int *)&start_readonly);
9213 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
9214 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
9215 module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR);
9217 MODULE_LICENSE("GPL");
9218 MODULE_DESCRIPTION("MD RAID framework");
9220 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);