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]) < MD_DISK_ROLE_MAX)
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)) {
1631 role = MD_DISK_ROLE_SPARE;
1634 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1636 case MD_DISK_ROLE_SPARE: /* spare */
1638 case MD_DISK_ROLE_FAULTY: /* faulty */
1639 set_bit(Faulty, &rdev->flags);
1641 case MD_DISK_ROLE_JOURNAL: /* journal device */
1642 if (!(le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL)) {
1643 /* journal device without journal feature */
1645 "md: journal device provided without journal feature, ignoring the device\n");
1648 set_bit(Journal, &rdev->flags);
1649 rdev->journal_tail = le64_to_cpu(sb->journal_tail);
1652 rdev->saved_raid_disk = role;
1653 if ((le32_to_cpu(sb->feature_map) &
1654 MD_FEATURE_RECOVERY_OFFSET)) {
1655 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1656 if (!(le32_to_cpu(sb->feature_map) &
1657 MD_FEATURE_RECOVERY_BITMAP))
1658 rdev->saved_raid_disk = -1;
1660 set_bit(In_sync, &rdev->flags);
1661 rdev->raid_disk = role;
1664 if (sb->devflags & WriteMostly1)
1665 set_bit(WriteMostly, &rdev->flags);
1666 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_REPLACEMENT)
1667 set_bit(Replacement, &rdev->flags);
1668 } else /* MULTIPATH are always insync */
1669 set_bit(In_sync, &rdev->flags);
1674 static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev)
1676 struct mdp_superblock_1 *sb;
1677 struct md_rdev *rdev2;
1679 /* make rdev->sb match mddev and rdev data. */
1681 sb = page_address(rdev->sb_page);
1683 sb->feature_map = 0;
1685 sb->recovery_offset = cpu_to_le64(0);
1686 memset(sb->pad3, 0, sizeof(sb->pad3));
1688 sb->utime = cpu_to_le64((__u64)mddev->utime);
1689 sb->events = cpu_to_le64(mddev->events);
1691 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1693 sb->resync_offset = cpu_to_le64(0);
1695 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
1697 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
1698 sb->size = cpu_to_le64(mddev->dev_sectors);
1699 sb->chunksize = cpu_to_le32(mddev->chunk_sectors);
1700 sb->level = cpu_to_le32(mddev->level);
1701 sb->layout = cpu_to_le32(mddev->layout);
1703 if (test_bit(WriteMostly, &rdev->flags))
1704 sb->devflags |= WriteMostly1;
1706 sb->devflags &= ~WriteMostly1;
1707 sb->data_offset = cpu_to_le64(rdev->data_offset);
1708 sb->data_size = cpu_to_le64(rdev->sectors);
1710 if (mddev->bitmap && mddev->bitmap_info.file == NULL) {
1711 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset);
1712 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
1715 if (rdev->raid_disk >= 0 &&
1716 !test_bit(In_sync, &rdev->flags)) {
1718 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1719 sb->recovery_offset =
1720 cpu_to_le64(rdev->recovery_offset);
1721 if (rdev->saved_raid_disk >= 0 && mddev->bitmap)
1723 cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP);
1725 /* Note: recovery_offset and journal_tail share space */
1726 if (test_bit(Journal, &rdev->flags))
1727 sb->journal_tail = cpu_to_le64(rdev->journal_tail);
1728 if (test_bit(Replacement, &rdev->flags))
1730 cpu_to_le32(MD_FEATURE_REPLACEMENT);
1732 if (mddev->reshape_position != MaxSector) {
1733 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1734 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1735 sb->new_layout = cpu_to_le32(mddev->new_layout);
1736 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1737 sb->new_level = cpu_to_le32(mddev->new_level);
1738 sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors);
1739 if (mddev->delta_disks == 0 &&
1740 mddev->reshape_backwards)
1742 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS);
1743 if (rdev->new_data_offset != rdev->data_offset) {
1745 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET);
1746 sb->new_offset = cpu_to_le32((__u32)(rdev->new_data_offset
1747 - rdev->data_offset));
1751 if (mddev_is_clustered(mddev))
1752 sb->feature_map |= cpu_to_le32(MD_FEATURE_CLUSTERED);
1754 if (rdev->badblocks.count == 0)
1755 /* Nothing to do for bad blocks*/ ;
1756 else if (sb->bblog_offset == 0)
1757 /* Cannot record bad blocks on this device */
1758 md_error(mddev, rdev);
1760 struct badblocks *bb = &rdev->badblocks;
1761 u64 *bbp = (u64 *)page_address(rdev->bb_page);
1763 sb->feature_map |= cpu_to_le32(MD_FEATURE_BAD_BLOCKS);
1768 seq = read_seqbegin(&bb->lock);
1770 memset(bbp, 0xff, PAGE_SIZE);
1772 for (i = 0 ; i < bb->count ; i++) {
1773 u64 internal_bb = p[i];
1774 u64 store_bb = ((BB_OFFSET(internal_bb) << 10)
1775 | BB_LEN(internal_bb));
1776 bbp[i] = cpu_to_le64(store_bb);
1779 if (read_seqretry(&bb->lock, seq))
1782 bb->sector = (rdev->sb_start +
1783 (int)le32_to_cpu(sb->bblog_offset));
1784 bb->size = le16_to_cpu(sb->bblog_size);
1789 rdev_for_each(rdev2, mddev)
1790 if (rdev2->desc_nr+1 > max_dev)
1791 max_dev = rdev2->desc_nr+1;
1793 if (max_dev > le32_to_cpu(sb->max_dev)) {
1795 sb->max_dev = cpu_to_le32(max_dev);
1796 rdev->sb_size = max_dev * 2 + 256;
1797 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1798 if (rdev->sb_size & bmask)
1799 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1801 max_dev = le32_to_cpu(sb->max_dev);
1803 for (i=0; i<max_dev;i++)
1804 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_FAULTY);
1806 rdev_for_each(rdev2, mddev) {
1808 if (test_bit(Faulty, &rdev2->flags))
1809 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_FAULTY);
1810 else if (test_bit(In_sync, &rdev2->flags))
1811 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1812 else if (test_bit(Journal, &rdev2->flags)) {
1813 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_JOURNAL);
1814 sb->feature_map |= cpu_to_le32(MD_FEATURE_JOURNAL);
1815 } else if (rdev2->raid_disk >= 0)
1816 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1818 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_SPARE);
1821 sb->sb_csum = calc_sb_1_csum(sb);
1824 static unsigned long long
1825 super_1_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
1827 struct mdp_superblock_1 *sb;
1828 sector_t max_sectors;
1829 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1830 return 0; /* component must fit device */
1831 if (rdev->data_offset != rdev->new_data_offset)
1832 return 0; /* too confusing */
1833 if (rdev->sb_start < rdev->data_offset) {
1834 /* minor versions 1 and 2; superblock before data */
1835 max_sectors = i_size_read(rdev->bdev->bd_inode) >> 9;
1836 max_sectors -= rdev->data_offset;
1837 if (!num_sectors || num_sectors > max_sectors)
1838 num_sectors = max_sectors;
1839 } else if (rdev->mddev->bitmap_info.offset) {
1840 /* minor version 0 with bitmap we can't move */
1843 /* minor version 0; superblock after data */
1845 sb_start = (i_size_read(rdev->bdev->bd_inode) >> 9) - 8*2;
1846 sb_start &= ~(sector_t)(4*2 - 1);
1847 max_sectors = rdev->sectors + sb_start - rdev->sb_start;
1848 if (!num_sectors || num_sectors > max_sectors)
1849 num_sectors = max_sectors;
1850 rdev->sb_start = sb_start;
1852 sb = page_address(rdev->sb_page);
1853 sb->data_size = cpu_to_le64(num_sectors);
1854 sb->super_offset = rdev->sb_start;
1855 sb->sb_csum = calc_sb_1_csum(sb);
1856 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1858 md_super_wait(rdev->mddev);
1864 super_1_allow_new_offset(struct md_rdev *rdev,
1865 unsigned long long new_offset)
1867 /* All necessary checks on new >= old have been done */
1868 struct bitmap *bitmap;
1869 if (new_offset >= rdev->data_offset)
1872 /* with 1.0 metadata, there is no metadata to tread on
1873 * so we can always move back */
1874 if (rdev->mddev->minor_version == 0)
1877 /* otherwise we must be sure not to step on
1878 * any metadata, so stay:
1879 * 36K beyond start of superblock
1880 * beyond end of badblocks
1881 * beyond write-intent bitmap
1883 if (rdev->sb_start + (32+4)*2 > new_offset)
1885 bitmap = rdev->mddev->bitmap;
1886 if (bitmap && !rdev->mddev->bitmap_info.file &&
1887 rdev->sb_start + rdev->mddev->bitmap_info.offset +
1888 bitmap->storage.file_pages * (PAGE_SIZE>>9) > new_offset)
1890 if (rdev->badblocks.sector + rdev->badblocks.size > new_offset)
1896 static struct super_type super_types[] = {
1899 .owner = THIS_MODULE,
1900 .load_super = super_90_load,
1901 .validate_super = super_90_validate,
1902 .sync_super = super_90_sync,
1903 .rdev_size_change = super_90_rdev_size_change,
1904 .allow_new_offset = super_90_allow_new_offset,
1908 .owner = THIS_MODULE,
1909 .load_super = super_1_load,
1910 .validate_super = super_1_validate,
1911 .sync_super = super_1_sync,
1912 .rdev_size_change = super_1_rdev_size_change,
1913 .allow_new_offset = super_1_allow_new_offset,
1917 static void sync_super(struct mddev *mddev, struct md_rdev *rdev)
1919 if (mddev->sync_super) {
1920 mddev->sync_super(mddev, rdev);
1924 BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types));
1926 super_types[mddev->major_version].sync_super(mddev, rdev);
1929 static int match_mddev_units(struct mddev *mddev1, struct mddev *mddev2)
1931 struct md_rdev *rdev, *rdev2;
1934 rdev_for_each_rcu(rdev, mddev1)
1935 rdev_for_each_rcu(rdev2, mddev2)
1936 if (rdev->bdev->bd_contains ==
1937 rdev2->bdev->bd_contains) {
1945 static LIST_HEAD(pending_raid_disks);
1948 * Try to register data integrity profile for an mddev
1950 * This is called when an array is started and after a disk has been kicked
1951 * from the array. It only succeeds if all working and active component devices
1952 * are integrity capable with matching profiles.
1954 int md_integrity_register(struct mddev *mddev)
1956 struct md_rdev *rdev, *reference = NULL;
1958 if (list_empty(&mddev->disks))
1959 return 0; /* nothing to do */
1960 if (!mddev->gendisk || blk_get_integrity(mddev->gendisk))
1961 return 0; /* shouldn't register, or already is */
1962 rdev_for_each(rdev, mddev) {
1963 /* skip spares and non-functional disks */
1964 if (test_bit(Faulty, &rdev->flags))
1966 if (rdev->raid_disk < 0)
1969 /* Use the first rdev as the reference */
1973 /* does this rdev's profile match the reference profile? */
1974 if (blk_integrity_compare(reference->bdev->bd_disk,
1975 rdev->bdev->bd_disk) < 0)
1978 if (!reference || !bdev_get_integrity(reference->bdev))
1981 * All component devices are integrity capable and have matching
1982 * profiles, register the common profile for the md device.
1984 if (blk_integrity_register(mddev->gendisk,
1985 bdev_get_integrity(reference->bdev)) != 0) {
1986 printk(KERN_ERR "md: failed to register integrity for %s\n",
1990 printk(KERN_NOTICE "md: data integrity enabled on %s\n", mdname(mddev));
1991 if (bioset_integrity_create(mddev->bio_set, BIO_POOL_SIZE)) {
1992 printk(KERN_ERR "md: failed to create integrity pool for %s\n",
1998 EXPORT_SYMBOL(md_integrity_register);
2000 /* Disable data integrity if non-capable/non-matching disk is being added */
2001 void md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev)
2003 struct blk_integrity *bi_rdev;
2004 struct blk_integrity *bi_mddev;
2006 if (!mddev->gendisk)
2009 bi_rdev = bdev_get_integrity(rdev->bdev);
2010 bi_mddev = blk_get_integrity(mddev->gendisk);
2012 if (!bi_mddev) /* nothing to do */
2014 if (rdev->raid_disk < 0) /* skip spares */
2016 if (bi_rdev && blk_integrity_compare(mddev->gendisk,
2017 rdev->bdev->bd_disk) >= 0)
2019 printk(KERN_NOTICE "disabling data integrity on %s\n", mdname(mddev));
2020 blk_integrity_unregister(mddev->gendisk);
2022 EXPORT_SYMBOL(md_integrity_add_rdev);
2024 static int bind_rdev_to_array(struct md_rdev *rdev, struct mddev *mddev)
2026 char b[BDEVNAME_SIZE];
2030 /* prevent duplicates */
2031 if (find_rdev(mddev, rdev->bdev->bd_dev))
2034 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2035 if (rdev->sectors && (mddev->dev_sectors == 0 ||
2036 rdev->sectors < mddev->dev_sectors)) {
2038 /* Cannot change size, so fail
2039 * If mddev->level <= 0, then we don't care
2040 * about aligning sizes (e.g. linear)
2042 if (mddev->level > 0)
2045 mddev->dev_sectors = rdev->sectors;
2048 /* Verify rdev->desc_nr is unique.
2049 * If it is -1, assign a free number, else
2050 * check number is not in use
2053 if (rdev->desc_nr < 0) {
2056 choice = mddev->raid_disks;
2057 while (md_find_rdev_nr_rcu(mddev, choice))
2059 rdev->desc_nr = choice;
2061 if (md_find_rdev_nr_rcu(mddev, rdev->desc_nr)) {
2067 if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) {
2068 printk(KERN_WARNING "md: %s: array is limited to %d devices\n",
2069 mdname(mddev), mddev->max_disks);
2072 bdevname(rdev->bdev,b);
2073 strreplace(b, '/', '!');
2075 rdev->mddev = mddev;
2076 printk(KERN_INFO "md: bind<%s>\n", b);
2078 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
2081 ko = &part_to_dev(rdev->bdev->bd_part)->kobj;
2082 if (sysfs_create_link(&rdev->kobj, ko, "block"))
2083 /* failure here is OK */;
2084 rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state");
2086 list_add_rcu(&rdev->same_set, &mddev->disks);
2087 bd_link_disk_holder(rdev->bdev, mddev->gendisk);
2089 /* May as well allow recovery to be retried once */
2090 mddev->recovery_disabled++;
2095 printk(KERN_WARNING "md: failed to register dev-%s for %s\n",
2100 static void md_delayed_delete(struct work_struct *ws)
2102 struct md_rdev *rdev = container_of(ws, struct md_rdev, del_work);
2103 kobject_del(&rdev->kobj);
2104 kobject_put(&rdev->kobj);
2107 static void unbind_rdev_from_array(struct md_rdev *rdev)
2109 char b[BDEVNAME_SIZE];
2111 bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk);
2112 list_del_rcu(&rdev->same_set);
2113 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
2115 sysfs_remove_link(&rdev->kobj, "block");
2116 sysfs_put(rdev->sysfs_state);
2117 rdev->sysfs_state = NULL;
2118 rdev->badblocks.count = 0;
2119 /* We need to delay this, otherwise we can deadlock when
2120 * writing to 'remove' to "dev/state". We also need
2121 * to delay it due to rcu usage.
2124 INIT_WORK(&rdev->del_work, md_delayed_delete);
2125 kobject_get(&rdev->kobj);
2126 queue_work(md_misc_wq, &rdev->del_work);
2130 * prevent the device from being mounted, repartitioned or
2131 * otherwise reused by a RAID array (or any other kernel
2132 * subsystem), by bd_claiming the device.
2134 static int lock_rdev(struct md_rdev *rdev, dev_t dev, int shared)
2137 struct block_device *bdev;
2138 char b[BDEVNAME_SIZE];
2140 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
2141 shared ? (struct md_rdev *)lock_rdev : rdev);
2143 printk(KERN_ERR "md: could not open %s.\n",
2144 __bdevname(dev, b));
2145 return PTR_ERR(bdev);
2151 static void unlock_rdev(struct md_rdev *rdev)
2153 struct block_device *bdev = rdev->bdev;
2155 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
2158 void md_autodetect_dev(dev_t dev);
2160 static void export_rdev(struct md_rdev *rdev)
2162 char b[BDEVNAME_SIZE];
2164 printk(KERN_INFO "md: export_rdev(%s)\n",
2165 bdevname(rdev->bdev,b));
2166 md_rdev_clear(rdev);
2168 if (test_bit(AutoDetected, &rdev->flags))
2169 md_autodetect_dev(rdev->bdev->bd_dev);
2172 kobject_put(&rdev->kobj);
2175 void md_kick_rdev_from_array(struct md_rdev *rdev)
2177 unbind_rdev_from_array(rdev);
2180 EXPORT_SYMBOL_GPL(md_kick_rdev_from_array);
2182 static void export_array(struct mddev *mddev)
2184 struct md_rdev *rdev;
2186 while (!list_empty(&mddev->disks)) {
2187 rdev = list_first_entry(&mddev->disks, struct md_rdev,
2189 md_kick_rdev_from_array(rdev);
2191 mddev->raid_disks = 0;
2192 mddev->major_version = 0;
2195 static void sync_sbs(struct mddev *mddev, int nospares)
2197 /* Update each superblock (in-memory image), but
2198 * if we are allowed to, skip spares which already
2199 * have the right event counter, or have one earlier
2200 * (which would mean they aren't being marked as dirty
2201 * with the rest of the array)
2203 struct md_rdev *rdev;
2204 rdev_for_each(rdev, mddev) {
2205 if (rdev->sb_events == mddev->events ||
2207 rdev->raid_disk < 0 &&
2208 rdev->sb_events+1 == mddev->events)) {
2209 /* Don't update this superblock */
2210 rdev->sb_loaded = 2;
2212 sync_super(mddev, rdev);
2213 rdev->sb_loaded = 1;
2218 static bool does_sb_need_changing(struct mddev *mddev)
2220 struct md_rdev *rdev;
2221 struct mdp_superblock_1 *sb;
2224 /* Find a good rdev */
2225 rdev_for_each(rdev, mddev)
2226 if ((rdev->raid_disk >= 0) && !test_bit(Faulty, &rdev->flags))
2229 /* No good device found. */
2233 sb = page_address(rdev->sb_page);
2234 /* Check if a device has become faulty or a spare become active */
2235 rdev_for_each(rdev, mddev) {
2236 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
2237 /* Device activated? */
2238 if (role == 0xffff && rdev->raid_disk >=0 &&
2239 !test_bit(Faulty, &rdev->flags))
2241 /* Device turned faulty? */
2242 if (test_bit(Faulty, &rdev->flags) && (role < 0xfffd))
2246 /* Check if any mddev parameters have changed */
2247 if ((mddev->dev_sectors != le64_to_cpu(sb->size)) ||
2248 (mddev->reshape_position != le64_to_cpu(sb->reshape_position)) ||
2249 (mddev->layout != le64_to_cpu(sb->layout)) ||
2250 (mddev->raid_disks != le32_to_cpu(sb->raid_disks)) ||
2251 (mddev->chunk_sectors != le32_to_cpu(sb->chunksize)))
2257 void md_update_sb(struct mddev *mddev, int force_change)
2259 struct md_rdev *rdev;
2262 int any_badblocks_changed = 0;
2267 set_bit(MD_CHANGE_DEVS, &mddev->flags);
2271 if (mddev_is_clustered(mddev)) {
2272 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
2274 ret = md_cluster_ops->metadata_update_start(mddev);
2275 /* Has someone else has updated the sb */
2276 if (!does_sb_need_changing(mddev)) {
2278 md_cluster_ops->metadata_update_cancel(mddev);
2279 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2284 /* First make sure individual recovery_offsets are correct */
2285 rdev_for_each(rdev, mddev) {
2286 if (rdev->raid_disk >= 0 &&
2287 mddev->delta_disks >= 0 &&
2288 !test_bit(In_sync, &rdev->flags) &&
2289 mddev->curr_resync_completed > rdev->recovery_offset)
2290 rdev->recovery_offset = mddev->curr_resync_completed;
2293 if (!mddev->persistent) {
2294 clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
2295 clear_bit(MD_CHANGE_DEVS, &mddev->flags);
2296 if (!mddev->external) {
2297 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2298 rdev_for_each(rdev, mddev) {
2299 if (rdev->badblocks.changed) {
2300 rdev->badblocks.changed = 0;
2301 md_ack_all_badblocks(&rdev->badblocks);
2302 md_error(mddev, rdev);
2304 clear_bit(Blocked, &rdev->flags);
2305 clear_bit(BlockedBadBlocks, &rdev->flags);
2306 wake_up(&rdev->blocked_wait);
2309 wake_up(&mddev->sb_wait);
2313 spin_lock(&mddev->lock);
2315 mddev->utime = get_seconds();
2317 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
2319 if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags))
2320 /* just a clean<-> dirty transition, possibly leave spares alone,
2321 * though if events isn't the right even/odd, we will have to do
2327 if (mddev->degraded)
2328 /* If the array is degraded, then skipping spares is both
2329 * dangerous and fairly pointless.
2330 * Dangerous because a device that was removed from the array
2331 * might have a event_count that still looks up-to-date,
2332 * so it can be re-added without a resync.
2333 * Pointless because if there are any spares to skip,
2334 * then a recovery will happen and soon that array won't
2335 * be degraded any more and the spare can go back to sleep then.
2339 sync_req = mddev->in_sync;
2341 /* If this is just a dirty<->clean transition, and the array is clean
2342 * and 'events' is odd, we can roll back to the previous clean state */
2344 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
2345 && mddev->can_decrease_events
2346 && mddev->events != 1) {
2348 mddev->can_decrease_events = 0;
2350 /* otherwise we have to go forward and ... */
2352 mddev->can_decrease_events = nospares;
2356 * This 64-bit counter should never wrap.
2357 * Either we are in around ~1 trillion A.C., assuming
2358 * 1 reboot per second, or we have a bug...
2360 WARN_ON(mddev->events == 0);
2362 rdev_for_each(rdev, mddev) {
2363 if (rdev->badblocks.changed)
2364 any_badblocks_changed++;
2365 if (test_bit(Faulty, &rdev->flags))
2366 set_bit(FaultRecorded, &rdev->flags);
2369 sync_sbs(mddev, nospares);
2370 spin_unlock(&mddev->lock);
2372 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2373 mdname(mddev), mddev->in_sync);
2375 bitmap_update_sb(mddev->bitmap);
2376 rdev_for_each(rdev, mddev) {
2377 char b[BDEVNAME_SIZE];
2379 if (rdev->sb_loaded != 1)
2380 continue; /* no noise on spare devices */
2382 if (!test_bit(Faulty, &rdev->flags)) {
2383 md_super_write(mddev,rdev,
2384 rdev->sb_start, rdev->sb_size,
2386 pr_debug("md: (write) %s's sb offset: %llu\n",
2387 bdevname(rdev->bdev, b),
2388 (unsigned long long)rdev->sb_start);
2389 rdev->sb_events = mddev->events;
2390 if (rdev->badblocks.size) {
2391 md_super_write(mddev, rdev,
2392 rdev->badblocks.sector,
2393 rdev->badblocks.size << 9,
2395 rdev->badblocks.size = 0;
2399 pr_debug("md: %s (skipping faulty)\n",
2400 bdevname(rdev->bdev, b));
2402 if (mddev->level == LEVEL_MULTIPATH)
2403 /* only need to write one superblock... */
2406 md_super_wait(mddev);
2407 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2409 spin_lock(&mddev->lock);
2410 if (mddev->in_sync != sync_req ||
2411 test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
2412 /* have to write it out again */
2413 spin_unlock(&mddev->lock);
2416 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2417 spin_unlock(&mddev->lock);
2418 wake_up(&mddev->sb_wait);
2419 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
2420 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
2422 rdev_for_each(rdev, mddev) {
2423 if (test_and_clear_bit(FaultRecorded, &rdev->flags))
2424 clear_bit(Blocked, &rdev->flags);
2426 if (any_badblocks_changed)
2427 md_ack_all_badblocks(&rdev->badblocks);
2428 clear_bit(BlockedBadBlocks, &rdev->flags);
2429 wake_up(&rdev->blocked_wait);
2432 if (mddev_is_clustered(mddev) && ret == 0)
2433 md_cluster_ops->metadata_update_finish(mddev);
2435 EXPORT_SYMBOL(md_update_sb);
2437 static int add_bound_rdev(struct md_rdev *rdev)
2439 struct mddev *mddev = rdev->mddev;
2442 if (!mddev->pers->hot_remove_disk) {
2443 /* If there is hot_add_disk but no hot_remove_disk
2444 * then added disks for geometry changes,
2445 * and should be added immediately.
2447 super_types[mddev->major_version].
2448 validate_super(mddev, rdev);
2449 err = mddev->pers->hot_add_disk(mddev, rdev);
2451 unbind_rdev_from_array(rdev);
2456 sysfs_notify_dirent_safe(rdev->sysfs_state);
2458 set_bit(MD_CHANGE_DEVS, &mddev->flags);
2459 if (mddev->degraded)
2460 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
2461 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2462 md_new_event(mddev);
2463 md_wakeup_thread(mddev->thread);
2467 /* words written to sysfs files may, or may not, be \n terminated.
2468 * We want to accept with case. For this we use cmd_match.
2470 static int cmd_match(const char *cmd, const char *str)
2472 /* See if cmd, written into a sysfs file, matches
2473 * str. They must either be the same, or cmd can
2474 * have a trailing newline
2476 while (*cmd && *str && *cmd == *str) {
2487 struct rdev_sysfs_entry {
2488 struct attribute attr;
2489 ssize_t (*show)(struct md_rdev *, char *);
2490 ssize_t (*store)(struct md_rdev *, const char *, size_t);
2494 state_show(struct md_rdev *rdev, char *page)
2498 unsigned long flags = ACCESS_ONCE(rdev->flags);
2500 if (test_bit(Faulty, &flags) ||
2501 rdev->badblocks.unacked_exist) {
2502 len+= sprintf(page+len, "%sfaulty",sep);
2505 if (test_bit(In_sync, &flags)) {
2506 len += sprintf(page+len, "%sin_sync",sep);
2509 if (test_bit(WriteMostly, &flags)) {
2510 len += sprintf(page+len, "%swrite_mostly",sep);
2513 if (test_bit(Blocked, &flags) ||
2514 (rdev->badblocks.unacked_exist
2515 && !test_bit(Faulty, &flags))) {
2516 len += sprintf(page+len, "%sblocked", sep);
2519 if (!test_bit(Faulty, &flags) &&
2520 !test_bit(In_sync, &flags)) {
2521 len += sprintf(page+len, "%sspare", sep);
2524 if (test_bit(WriteErrorSeen, &flags)) {
2525 len += sprintf(page+len, "%swrite_error", sep);
2528 if (test_bit(WantReplacement, &flags)) {
2529 len += sprintf(page+len, "%swant_replacement", sep);
2532 if (test_bit(Replacement, &flags)) {
2533 len += sprintf(page+len, "%sreplacement", sep);
2537 return len+sprintf(page+len, "\n");
2541 state_store(struct md_rdev *rdev, const char *buf, size_t len)
2544 * faulty - simulates an error
2545 * remove - disconnects the device
2546 * writemostly - sets write_mostly
2547 * -writemostly - clears write_mostly
2548 * blocked - sets the Blocked flags
2549 * -blocked - clears the Blocked and possibly simulates an error
2550 * insync - sets Insync providing device isn't active
2551 * -insync - clear Insync for a device with a slot assigned,
2552 * so that it gets rebuilt based on bitmap
2553 * write_error - sets WriteErrorSeen
2554 * -write_error - clears WriteErrorSeen
2557 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
2558 md_error(rdev->mddev, rdev);
2559 if (test_bit(Faulty, &rdev->flags))
2563 } else if (cmd_match(buf, "remove")) {
2564 if (rdev->raid_disk >= 0)
2567 struct mddev *mddev = rdev->mddev;
2569 if (mddev_is_clustered(mddev))
2570 err = md_cluster_ops->remove_disk(mddev, rdev);
2573 md_kick_rdev_from_array(rdev);
2575 md_update_sb(mddev, 1);
2576 md_new_event(mddev);
2579 } else if (cmd_match(buf, "writemostly")) {
2580 set_bit(WriteMostly, &rdev->flags);
2582 } else if (cmd_match(buf, "-writemostly")) {
2583 clear_bit(WriteMostly, &rdev->flags);
2585 } else if (cmd_match(buf, "blocked")) {
2586 set_bit(Blocked, &rdev->flags);
2588 } else if (cmd_match(buf, "-blocked")) {
2589 if (!test_bit(Faulty, &rdev->flags) &&
2590 rdev->badblocks.unacked_exist) {
2591 /* metadata handler doesn't understand badblocks,
2592 * so we need to fail the device
2594 md_error(rdev->mddev, rdev);
2596 clear_bit(Blocked, &rdev->flags);
2597 clear_bit(BlockedBadBlocks, &rdev->flags);
2598 wake_up(&rdev->blocked_wait);
2599 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2600 md_wakeup_thread(rdev->mddev->thread);
2603 } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) {
2604 set_bit(In_sync, &rdev->flags);
2606 } else if (cmd_match(buf, "-insync") && rdev->raid_disk >= 0) {
2607 if (rdev->mddev->pers == NULL) {
2608 clear_bit(In_sync, &rdev->flags);
2609 rdev->saved_raid_disk = rdev->raid_disk;
2610 rdev->raid_disk = -1;
2613 } else if (cmd_match(buf, "write_error")) {
2614 set_bit(WriteErrorSeen, &rdev->flags);
2616 } else if (cmd_match(buf, "-write_error")) {
2617 clear_bit(WriteErrorSeen, &rdev->flags);
2619 } else if (cmd_match(buf, "want_replacement")) {
2620 /* Any non-spare device that is not a replacement can
2621 * become want_replacement at any time, but we then need to
2622 * check if recovery is needed.
2624 if (rdev->raid_disk >= 0 &&
2625 !test_bit(Replacement, &rdev->flags))
2626 set_bit(WantReplacement, &rdev->flags);
2627 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2628 md_wakeup_thread(rdev->mddev->thread);
2630 } else if (cmd_match(buf, "-want_replacement")) {
2631 /* Clearing 'want_replacement' is always allowed.
2632 * Once replacements starts it is too late though.
2635 clear_bit(WantReplacement, &rdev->flags);
2636 } else if (cmd_match(buf, "replacement")) {
2637 /* Can only set a device as a replacement when array has not
2638 * yet been started. Once running, replacement is automatic
2639 * from spares, or by assigning 'slot'.
2641 if (rdev->mddev->pers)
2644 set_bit(Replacement, &rdev->flags);
2647 } else if (cmd_match(buf, "-replacement")) {
2648 /* Similarly, can only clear Replacement before start */
2649 if (rdev->mddev->pers)
2652 clear_bit(Replacement, &rdev->flags);
2655 } else if (cmd_match(buf, "re-add")) {
2656 if (test_bit(Faulty, &rdev->flags) && (rdev->raid_disk == -1)) {
2657 /* clear_bit is performed _after_ all the devices
2658 * have their local Faulty bit cleared. If any writes
2659 * happen in the meantime in the local node, they
2660 * will land in the local bitmap, which will be synced
2661 * by this node eventually
2663 if (!mddev_is_clustered(rdev->mddev) ||
2664 (err = md_cluster_ops->gather_bitmaps(rdev)) == 0) {
2665 clear_bit(Faulty, &rdev->flags);
2666 err = add_bound_rdev(rdev);
2672 sysfs_notify_dirent_safe(rdev->sysfs_state);
2673 return err ? err : len;
2675 static struct rdev_sysfs_entry rdev_state =
2676 __ATTR_PREALLOC(state, S_IRUGO|S_IWUSR, state_show, state_store);
2679 errors_show(struct md_rdev *rdev, char *page)
2681 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
2685 errors_store(struct md_rdev *rdev, const char *buf, size_t len)
2690 rv = kstrtouint(buf, 10, &n);
2693 atomic_set(&rdev->corrected_errors, n);
2696 static struct rdev_sysfs_entry rdev_errors =
2697 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
2700 slot_show(struct md_rdev *rdev, char *page)
2702 if (rdev->raid_disk < 0)
2703 return sprintf(page, "none\n");
2705 return sprintf(page, "%d\n", rdev->raid_disk);
2709 slot_store(struct md_rdev *rdev, const char *buf, size_t len)
2714 if (strncmp(buf, "none", 4)==0)
2717 err = kstrtouint(buf, 10, (unsigned int *)&slot);
2721 if (rdev->mddev->pers && slot == -1) {
2722 /* Setting 'slot' on an active array requires also
2723 * updating the 'rd%d' link, and communicating
2724 * with the personality with ->hot_*_disk.
2725 * For now we only support removing
2726 * failed/spare devices. This normally happens automatically,
2727 * but not when the metadata is externally managed.
2729 if (rdev->raid_disk == -1)
2731 /* personality does all needed checks */
2732 if (rdev->mddev->pers->hot_remove_disk == NULL)
2734 clear_bit(Blocked, &rdev->flags);
2735 remove_and_add_spares(rdev->mddev, rdev);
2736 if (rdev->raid_disk >= 0)
2738 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2739 md_wakeup_thread(rdev->mddev->thread);
2740 } else if (rdev->mddev->pers) {
2741 /* Activating a spare .. or possibly reactivating
2742 * if we ever get bitmaps working here.
2745 if (rdev->raid_disk != -1)
2748 if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery))
2751 if (rdev->mddev->pers->hot_add_disk == NULL)
2754 if (slot >= rdev->mddev->raid_disks &&
2755 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
2758 rdev->raid_disk = slot;
2759 if (test_bit(In_sync, &rdev->flags))
2760 rdev->saved_raid_disk = slot;
2762 rdev->saved_raid_disk = -1;
2763 clear_bit(In_sync, &rdev->flags);
2764 clear_bit(Bitmap_sync, &rdev->flags);
2765 remove_and_add_spares(rdev->mddev, rdev);
2766 if (rdev->raid_disk == -1)
2768 /* don't wakeup anyone, leave that to userspace. */
2770 if (slot >= rdev->mddev->raid_disks &&
2771 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
2773 rdev->raid_disk = slot;
2774 /* assume it is working */
2775 clear_bit(Faulty, &rdev->flags);
2776 clear_bit(WriteMostly, &rdev->flags);
2777 set_bit(In_sync, &rdev->flags);
2778 sysfs_notify_dirent_safe(rdev->sysfs_state);
2783 static struct rdev_sysfs_entry rdev_slot =
2784 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
2787 offset_show(struct md_rdev *rdev, char *page)
2789 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
2793 offset_store(struct md_rdev *rdev, const char *buf, size_t len)
2795 unsigned long long offset;
2796 if (kstrtoull(buf, 10, &offset) < 0)
2798 if (rdev->mddev->pers && rdev->raid_disk >= 0)
2800 if (rdev->sectors && rdev->mddev->external)
2801 /* Must set offset before size, so overlap checks
2804 rdev->data_offset = offset;
2805 rdev->new_data_offset = offset;
2809 static struct rdev_sysfs_entry rdev_offset =
2810 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
2812 static ssize_t new_offset_show(struct md_rdev *rdev, char *page)
2814 return sprintf(page, "%llu\n",
2815 (unsigned long long)rdev->new_data_offset);
2818 static ssize_t new_offset_store(struct md_rdev *rdev,
2819 const char *buf, size_t len)
2821 unsigned long long new_offset;
2822 struct mddev *mddev = rdev->mddev;
2824 if (kstrtoull(buf, 10, &new_offset) < 0)
2827 if (mddev->sync_thread ||
2828 test_bit(MD_RECOVERY_RUNNING,&mddev->recovery))
2830 if (new_offset == rdev->data_offset)
2831 /* reset is always permitted */
2833 else if (new_offset > rdev->data_offset) {
2834 /* must not push array size beyond rdev_sectors */
2835 if (new_offset - rdev->data_offset
2836 + mddev->dev_sectors > rdev->sectors)
2839 /* Metadata worries about other space details. */
2841 /* decreasing the offset is inconsistent with a backwards
2844 if (new_offset < rdev->data_offset &&
2845 mddev->reshape_backwards)
2847 /* Increasing offset is inconsistent with forwards
2848 * reshape. reshape_direction should be set to
2849 * 'backwards' first.
2851 if (new_offset > rdev->data_offset &&
2852 !mddev->reshape_backwards)
2855 if (mddev->pers && mddev->persistent &&
2856 !super_types[mddev->major_version]
2857 .allow_new_offset(rdev, new_offset))
2859 rdev->new_data_offset = new_offset;
2860 if (new_offset > rdev->data_offset)
2861 mddev->reshape_backwards = 1;
2862 else if (new_offset < rdev->data_offset)
2863 mddev->reshape_backwards = 0;
2867 static struct rdev_sysfs_entry rdev_new_offset =
2868 __ATTR(new_offset, S_IRUGO|S_IWUSR, new_offset_show, new_offset_store);
2871 rdev_size_show(struct md_rdev *rdev, char *page)
2873 return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2);
2876 static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
2878 /* check if two start/length pairs overlap */
2886 static int strict_blocks_to_sectors(const char *buf, sector_t *sectors)
2888 unsigned long long blocks;
2891 if (kstrtoull(buf, 10, &blocks) < 0)
2894 if (blocks & 1ULL << (8 * sizeof(blocks) - 1))
2895 return -EINVAL; /* sector conversion overflow */
2898 if (new != blocks * 2)
2899 return -EINVAL; /* unsigned long long to sector_t overflow */
2906 rdev_size_store(struct md_rdev *rdev, const char *buf, size_t len)
2908 struct mddev *my_mddev = rdev->mddev;
2909 sector_t oldsectors = rdev->sectors;
2912 if (strict_blocks_to_sectors(buf, §ors) < 0)
2914 if (rdev->data_offset != rdev->new_data_offset)
2915 return -EINVAL; /* too confusing */
2916 if (my_mddev->pers && rdev->raid_disk >= 0) {
2917 if (my_mddev->persistent) {
2918 sectors = super_types[my_mddev->major_version].
2919 rdev_size_change(rdev, sectors);
2922 } else if (!sectors)
2923 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) -
2925 if (!my_mddev->pers->resize)
2926 /* Cannot change size for RAID0 or Linear etc */
2929 if (sectors < my_mddev->dev_sectors)
2930 return -EINVAL; /* component must fit device */
2932 rdev->sectors = sectors;
2933 if (sectors > oldsectors && my_mddev->external) {
2934 /* Need to check that all other rdevs with the same
2935 * ->bdev do not overlap. 'rcu' is sufficient to walk
2936 * the rdev lists safely.
2937 * This check does not provide a hard guarantee, it
2938 * just helps avoid dangerous mistakes.
2940 struct mddev *mddev;
2942 struct list_head *tmp;
2945 for_each_mddev(mddev, tmp) {
2946 struct md_rdev *rdev2;
2948 rdev_for_each(rdev2, mddev)
2949 if (rdev->bdev == rdev2->bdev &&
2951 overlaps(rdev->data_offset, rdev->sectors,
2964 /* Someone else could have slipped in a size
2965 * change here, but doing so is just silly.
2966 * We put oldsectors back because we *know* it is
2967 * safe, and trust userspace not to race with
2970 rdev->sectors = oldsectors;
2977 static struct rdev_sysfs_entry rdev_size =
2978 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
2980 static ssize_t recovery_start_show(struct md_rdev *rdev, char *page)
2982 unsigned long long recovery_start = rdev->recovery_offset;
2984 if (test_bit(In_sync, &rdev->flags) ||
2985 recovery_start == MaxSector)
2986 return sprintf(page, "none\n");
2988 return sprintf(page, "%llu\n", recovery_start);
2991 static ssize_t recovery_start_store(struct md_rdev *rdev, const char *buf, size_t len)
2993 unsigned long long recovery_start;
2995 if (cmd_match(buf, "none"))
2996 recovery_start = MaxSector;
2997 else if (kstrtoull(buf, 10, &recovery_start))
3000 if (rdev->mddev->pers &&
3001 rdev->raid_disk >= 0)
3004 rdev->recovery_offset = recovery_start;
3005 if (recovery_start == MaxSector)
3006 set_bit(In_sync, &rdev->flags);
3008 clear_bit(In_sync, &rdev->flags);
3012 static struct rdev_sysfs_entry rdev_recovery_start =
3013 __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store);
3016 badblocks_show(struct badblocks *bb, char *page, int unack);
3018 badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack);
3020 static ssize_t bb_show(struct md_rdev *rdev, char *page)
3022 return badblocks_show(&rdev->badblocks, page, 0);
3024 static ssize_t bb_store(struct md_rdev *rdev, const char *page, size_t len)
3026 int rv = badblocks_store(&rdev->badblocks, page, len, 0);
3027 /* Maybe that ack was all we needed */
3028 if (test_and_clear_bit(BlockedBadBlocks, &rdev->flags))
3029 wake_up(&rdev->blocked_wait);
3032 static struct rdev_sysfs_entry rdev_bad_blocks =
3033 __ATTR(bad_blocks, S_IRUGO|S_IWUSR, bb_show, bb_store);
3035 static ssize_t ubb_show(struct md_rdev *rdev, char *page)
3037 return badblocks_show(&rdev->badblocks, page, 1);
3039 static ssize_t ubb_store(struct md_rdev *rdev, const char *page, size_t len)
3041 return badblocks_store(&rdev->badblocks, page, len, 1);
3043 static struct rdev_sysfs_entry rdev_unack_bad_blocks =
3044 __ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store);
3046 static struct attribute *rdev_default_attrs[] = {
3051 &rdev_new_offset.attr,
3053 &rdev_recovery_start.attr,
3054 &rdev_bad_blocks.attr,
3055 &rdev_unack_bad_blocks.attr,
3059 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
3061 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3062 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3068 return entry->show(rdev, page);
3072 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
3073 const char *page, size_t length)
3075 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3076 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3078 struct mddev *mddev = rdev->mddev;
3082 if (!capable(CAP_SYS_ADMIN))
3084 rv = mddev ? mddev_lock(mddev): -EBUSY;
3086 if (rdev->mddev == NULL)
3089 rv = entry->store(rdev, page, length);
3090 mddev_unlock(mddev);
3095 static void rdev_free(struct kobject *ko)
3097 struct md_rdev *rdev = container_of(ko, struct md_rdev, kobj);
3100 static const struct sysfs_ops rdev_sysfs_ops = {
3101 .show = rdev_attr_show,
3102 .store = rdev_attr_store,
3104 static struct kobj_type rdev_ktype = {
3105 .release = rdev_free,
3106 .sysfs_ops = &rdev_sysfs_ops,
3107 .default_attrs = rdev_default_attrs,
3110 int md_rdev_init(struct md_rdev *rdev)
3113 rdev->saved_raid_disk = -1;
3114 rdev->raid_disk = -1;
3116 rdev->data_offset = 0;
3117 rdev->new_data_offset = 0;
3118 rdev->sb_events = 0;
3119 rdev->last_read_error.tv_sec = 0;
3120 rdev->last_read_error.tv_nsec = 0;
3121 rdev->sb_loaded = 0;
3122 rdev->bb_page = NULL;
3123 atomic_set(&rdev->nr_pending, 0);
3124 atomic_set(&rdev->read_errors, 0);
3125 atomic_set(&rdev->corrected_errors, 0);
3127 INIT_LIST_HEAD(&rdev->same_set);
3128 init_waitqueue_head(&rdev->blocked_wait);
3130 /* Add space to store bad block list.
3131 * This reserves the space even on arrays where it cannot
3132 * be used - I wonder if that matters
3134 rdev->badblocks.count = 0;
3135 rdev->badblocks.shift = -1; /* disabled until explicitly enabled */
3136 rdev->badblocks.page = kmalloc(PAGE_SIZE, GFP_KERNEL);
3137 seqlock_init(&rdev->badblocks.lock);
3138 if (rdev->badblocks.page == NULL)
3143 EXPORT_SYMBOL_GPL(md_rdev_init);
3145 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3147 * mark the device faulty if:
3149 * - the device is nonexistent (zero size)
3150 * - the device has no valid superblock
3152 * a faulty rdev _never_ has rdev->sb set.
3154 static struct md_rdev *md_import_device(dev_t newdev, int super_format, int super_minor)
3156 char b[BDEVNAME_SIZE];
3158 struct md_rdev *rdev;
3161 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
3163 printk(KERN_ERR "md: could not alloc mem for new device!\n");
3164 return ERR_PTR(-ENOMEM);
3167 err = md_rdev_init(rdev);
3170 err = alloc_disk_sb(rdev);
3174 err = lock_rdev(rdev, newdev, super_format == -2);
3178 kobject_init(&rdev->kobj, &rdev_ktype);
3180 size = i_size_read(rdev->bdev->bd_inode) >> BLOCK_SIZE_BITS;
3183 "md: %s has zero or unknown size, marking faulty!\n",
3184 bdevname(rdev->bdev,b));
3189 if (super_format >= 0) {
3190 err = super_types[super_format].
3191 load_super(rdev, NULL, super_minor);
3192 if (err == -EINVAL) {
3194 "md: %s does not have a valid v%d.%d "
3195 "superblock, not importing!\n",
3196 bdevname(rdev->bdev,b),
3197 super_format, super_minor);
3202 "md: could not read %s's sb, not importing!\n",
3203 bdevname(rdev->bdev,b));
3213 md_rdev_clear(rdev);
3215 return ERR_PTR(err);
3219 * Check a full RAID array for plausibility
3222 static void analyze_sbs(struct mddev *mddev)
3225 struct md_rdev *rdev, *freshest, *tmp;
3226 char b[BDEVNAME_SIZE];
3229 rdev_for_each_safe(rdev, tmp, mddev)
3230 switch (super_types[mddev->major_version].
3231 load_super(rdev, freshest, mddev->minor_version)) {
3239 "md: fatal superblock inconsistency in %s"
3240 " -- removing from array\n",
3241 bdevname(rdev->bdev,b));
3242 md_kick_rdev_from_array(rdev);
3245 super_types[mddev->major_version].
3246 validate_super(mddev, freshest);
3249 rdev_for_each_safe(rdev, tmp, mddev) {
3250 if (mddev->max_disks &&
3251 (rdev->desc_nr >= mddev->max_disks ||
3252 i > mddev->max_disks)) {
3254 "md: %s: %s: only %d devices permitted\n",
3255 mdname(mddev), bdevname(rdev->bdev, b),
3257 md_kick_rdev_from_array(rdev);
3260 if (rdev != freshest) {
3261 if (super_types[mddev->major_version].
3262 validate_super(mddev, rdev)) {
3263 printk(KERN_WARNING "md: kicking non-fresh %s"
3265 bdevname(rdev->bdev,b));
3266 md_kick_rdev_from_array(rdev);
3270 if (mddev->level == LEVEL_MULTIPATH) {
3271 rdev->desc_nr = i++;
3272 rdev->raid_disk = rdev->desc_nr;
3273 set_bit(In_sync, &rdev->flags);
3274 } else if (rdev->raid_disk >= (mddev->raid_disks - min(0, mddev->delta_disks))) {
3275 rdev->raid_disk = -1;
3276 clear_bit(In_sync, &rdev->flags);
3281 /* Read a fixed-point number.
3282 * Numbers in sysfs attributes should be in "standard" units where
3283 * possible, so time should be in seconds.
3284 * However we internally use a a much smaller unit such as
3285 * milliseconds or jiffies.
3286 * This function takes a decimal number with a possible fractional
3287 * component, and produces an integer which is the result of
3288 * multiplying that number by 10^'scale'.
3289 * all without any floating-point arithmetic.
3291 int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale)
3293 unsigned long result = 0;
3295 while (isdigit(*cp) || (*cp == '.' && decimals < 0)) {
3298 else if (decimals < scale) {
3301 result = result * 10 + value;
3313 while (decimals < scale) {
3322 safe_delay_show(struct mddev *mddev, char *page)
3324 int msec = (mddev->safemode_delay*1000)/HZ;
3325 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
3328 safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len)
3332 if (mddev_is_clustered(mddev)) {
3333 pr_info("md: Safemode is disabled for clustered mode\n");
3337 if (strict_strtoul_scaled(cbuf, &msec, 3) < 0)
3340 mddev->safemode_delay = 0;
3342 unsigned long old_delay = mddev->safemode_delay;
3343 unsigned long new_delay = (msec*HZ)/1000;
3347 mddev->safemode_delay = new_delay;
3348 if (new_delay < old_delay || old_delay == 0)
3349 mod_timer(&mddev->safemode_timer, jiffies+1);
3353 static struct md_sysfs_entry md_safe_delay =
3354 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
3357 level_show(struct mddev *mddev, char *page)
3359 struct md_personality *p;
3361 spin_lock(&mddev->lock);
3364 ret = sprintf(page, "%s\n", p->name);
3365 else if (mddev->clevel[0])
3366 ret = sprintf(page, "%s\n", mddev->clevel);
3367 else if (mddev->level != LEVEL_NONE)
3368 ret = sprintf(page, "%d\n", mddev->level);
3371 spin_unlock(&mddev->lock);
3376 level_store(struct mddev *mddev, const char *buf, size_t len)
3381 struct md_personality *pers, *oldpers;
3383 void *priv, *oldpriv;
3384 struct md_rdev *rdev;
3386 if (slen == 0 || slen >= sizeof(clevel))
3389 rv = mddev_lock(mddev);
3393 if (mddev->pers == NULL) {
3394 strncpy(mddev->clevel, buf, slen);
3395 if (mddev->clevel[slen-1] == '\n')
3397 mddev->clevel[slen] = 0;
3398 mddev->level = LEVEL_NONE;
3406 /* request to change the personality. Need to ensure:
3407 * - array is not engaged in resync/recovery/reshape
3408 * - old personality can be suspended
3409 * - new personality will access other array.
3413 if (mddev->sync_thread ||
3414 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3415 mddev->reshape_position != MaxSector ||
3416 mddev->sysfs_active)
3420 if (!mddev->pers->quiesce) {
3421 printk(KERN_WARNING "md: %s: %s does not support online personality change\n",
3422 mdname(mddev), mddev->pers->name);
3426 /* Now find the new personality */
3427 strncpy(clevel, buf, slen);
3428 if (clevel[slen-1] == '\n')
3431 if (kstrtol(clevel, 10, &level))
3434 if (request_module("md-%s", clevel) != 0)
3435 request_module("md-level-%s", clevel);
3436 spin_lock(&pers_lock);
3437 pers = find_pers(level, clevel);
3438 if (!pers || !try_module_get(pers->owner)) {
3439 spin_unlock(&pers_lock);
3440 printk(KERN_WARNING "md: personality %s not loaded\n", clevel);
3444 spin_unlock(&pers_lock);
3446 if (pers == mddev->pers) {
3447 /* Nothing to do! */
3448 module_put(pers->owner);
3452 if (!pers->takeover) {
3453 module_put(pers->owner);
3454 printk(KERN_WARNING "md: %s: %s does not support personality takeover\n",
3455 mdname(mddev), clevel);
3460 rdev_for_each(rdev, mddev)
3461 rdev->new_raid_disk = rdev->raid_disk;
3463 /* ->takeover must set new_* and/or delta_disks
3464 * if it succeeds, and may set them when it fails.
3466 priv = pers->takeover(mddev);
3468 mddev->new_level = mddev->level;
3469 mddev->new_layout = mddev->layout;
3470 mddev->new_chunk_sectors = mddev->chunk_sectors;
3471 mddev->raid_disks -= mddev->delta_disks;
3472 mddev->delta_disks = 0;
3473 mddev->reshape_backwards = 0;
3474 module_put(pers->owner);
3475 printk(KERN_WARNING "md: %s: %s would not accept array\n",
3476 mdname(mddev), clevel);
3481 /* Looks like we have a winner */
3482 mddev_suspend(mddev);
3483 mddev_detach(mddev);
3485 spin_lock(&mddev->lock);
3486 oldpers = mddev->pers;
3487 oldpriv = mddev->private;
3489 mddev->private = priv;
3490 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
3491 mddev->level = mddev->new_level;
3492 mddev->layout = mddev->new_layout;
3493 mddev->chunk_sectors = mddev->new_chunk_sectors;
3494 mddev->delta_disks = 0;
3495 mddev->reshape_backwards = 0;
3496 mddev->degraded = 0;
3497 spin_unlock(&mddev->lock);
3499 if (oldpers->sync_request == NULL &&
3501 /* We are converting from a no-redundancy array
3502 * to a redundancy array and metadata is managed
3503 * externally so we need to be sure that writes
3504 * won't block due to a need to transition
3506 * until external management is started.
3509 mddev->safemode_delay = 0;
3510 mddev->safemode = 0;
3513 oldpers->free(mddev, oldpriv);
3515 if (oldpers->sync_request == NULL &&
3516 pers->sync_request != NULL) {
3517 /* need to add the md_redundancy_group */
3518 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
3520 "md: cannot register extra attributes for %s\n",
3522 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action");
3524 if (oldpers->sync_request != NULL &&
3525 pers->sync_request == NULL) {
3526 /* need to remove the md_redundancy_group */
3527 if (mddev->to_remove == NULL)
3528 mddev->to_remove = &md_redundancy_group;
3531 rdev_for_each(rdev, mddev) {
3532 if (rdev->raid_disk < 0)
3534 if (rdev->new_raid_disk >= mddev->raid_disks)
3535 rdev->new_raid_disk = -1;
3536 if (rdev->new_raid_disk == rdev->raid_disk)
3538 sysfs_unlink_rdev(mddev, rdev);
3540 rdev_for_each(rdev, mddev) {
3541 if (rdev->raid_disk < 0)
3543 if (rdev->new_raid_disk == rdev->raid_disk)
3545 rdev->raid_disk = rdev->new_raid_disk;
3546 if (rdev->raid_disk < 0)
3547 clear_bit(In_sync, &rdev->flags);
3549 if (sysfs_link_rdev(mddev, rdev))
3550 printk(KERN_WARNING "md: cannot register rd%d"
3551 " for %s after level change\n",
3552 rdev->raid_disk, mdname(mddev));
3556 if (pers->sync_request == NULL) {
3557 /* this is now an array without redundancy, so
3558 * it must always be in_sync
3561 del_timer_sync(&mddev->safemode_timer);
3563 blk_set_stacking_limits(&mddev->queue->limits);
3565 set_bit(MD_CHANGE_DEVS, &mddev->flags);
3566 mddev_resume(mddev);
3568 md_update_sb(mddev, 1);
3569 sysfs_notify(&mddev->kobj, NULL, "level");
3570 md_new_event(mddev);
3573 mddev_unlock(mddev);
3577 static struct md_sysfs_entry md_level =
3578 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
3581 layout_show(struct mddev *mddev, char *page)
3583 /* just a number, not meaningful for all levels */
3584 if (mddev->reshape_position != MaxSector &&
3585 mddev->layout != mddev->new_layout)
3586 return sprintf(page, "%d (%d)\n",
3587 mddev->new_layout, mddev->layout);
3588 return sprintf(page, "%d\n", mddev->layout);
3592 layout_store(struct mddev *mddev, const char *buf, size_t len)
3597 err = kstrtouint(buf, 10, &n);
3600 err = mddev_lock(mddev);
3605 if (mddev->pers->check_reshape == NULL)
3610 mddev->new_layout = n;
3611 err = mddev->pers->check_reshape(mddev);
3613 mddev->new_layout = mddev->layout;
3616 mddev->new_layout = n;
3617 if (mddev->reshape_position == MaxSector)
3620 mddev_unlock(mddev);
3623 static struct md_sysfs_entry md_layout =
3624 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
3627 raid_disks_show(struct mddev *mddev, char *page)
3629 if (mddev->raid_disks == 0)
3631 if (mddev->reshape_position != MaxSector &&
3632 mddev->delta_disks != 0)
3633 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
3634 mddev->raid_disks - mddev->delta_disks);
3635 return sprintf(page, "%d\n", mddev->raid_disks);
3638 static int update_raid_disks(struct mddev *mddev, int raid_disks);
3641 raid_disks_store(struct mddev *mddev, const char *buf, size_t len)
3646 err = kstrtouint(buf, 10, &n);
3650 err = mddev_lock(mddev);
3654 err = update_raid_disks(mddev, n);
3655 else if (mddev->reshape_position != MaxSector) {
3656 struct md_rdev *rdev;
3657 int olddisks = mddev->raid_disks - mddev->delta_disks;
3660 rdev_for_each(rdev, mddev) {
3662 rdev->data_offset < rdev->new_data_offset)
3665 rdev->data_offset > rdev->new_data_offset)
3669 mddev->delta_disks = n - olddisks;
3670 mddev->raid_disks = n;
3671 mddev->reshape_backwards = (mddev->delta_disks < 0);
3673 mddev->raid_disks = n;
3675 mddev_unlock(mddev);
3676 return err ? err : len;
3678 static struct md_sysfs_entry md_raid_disks =
3679 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
3682 chunk_size_show(struct mddev *mddev, char *page)
3684 if (mddev->reshape_position != MaxSector &&
3685 mddev->chunk_sectors != mddev->new_chunk_sectors)
3686 return sprintf(page, "%d (%d)\n",
3687 mddev->new_chunk_sectors << 9,
3688 mddev->chunk_sectors << 9);
3689 return sprintf(page, "%d\n", mddev->chunk_sectors << 9);
3693 chunk_size_store(struct mddev *mddev, const char *buf, size_t len)
3698 err = kstrtoul(buf, 10, &n);
3702 err = mddev_lock(mddev);
3706 if (mddev->pers->check_reshape == NULL)
3711 mddev->new_chunk_sectors = n >> 9;
3712 err = mddev->pers->check_reshape(mddev);
3714 mddev->new_chunk_sectors = mddev->chunk_sectors;
3717 mddev->new_chunk_sectors = n >> 9;
3718 if (mddev->reshape_position == MaxSector)
3719 mddev->chunk_sectors = n >> 9;
3721 mddev_unlock(mddev);
3724 static struct md_sysfs_entry md_chunk_size =
3725 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
3728 resync_start_show(struct mddev *mddev, char *page)
3730 if (mddev->recovery_cp == MaxSector)
3731 return sprintf(page, "none\n");
3732 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
3736 resync_start_store(struct mddev *mddev, const char *buf, size_t len)
3738 unsigned long long n;
3741 if (cmd_match(buf, "none"))
3744 err = kstrtoull(buf, 10, &n);
3747 if (n != (sector_t)n)
3751 err = mddev_lock(mddev);
3754 if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
3758 mddev->recovery_cp = n;
3760 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
3762 mddev_unlock(mddev);
3765 static struct md_sysfs_entry md_resync_start =
3766 __ATTR_PREALLOC(resync_start, S_IRUGO|S_IWUSR,
3767 resync_start_show, resync_start_store);
3770 * The array state can be:
3773 * No devices, no size, no level
3774 * Equivalent to STOP_ARRAY ioctl
3776 * May have some settings, but array is not active
3777 * all IO results in error
3778 * When written, doesn't tear down array, but just stops it
3779 * suspended (not supported yet)
3780 * All IO requests will block. The array can be reconfigured.
3781 * Writing this, if accepted, will block until array is quiescent
3783 * no resync can happen. no superblocks get written.
3784 * write requests fail
3786 * like readonly, but behaves like 'clean' on a write request.
3788 * clean - no pending writes, but otherwise active.
3789 * When written to inactive array, starts without resync
3790 * If a write request arrives then
3791 * if metadata is known, mark 'dirty' and switch to 'active'.
3792 * if not known, block and switch to write-pending
3793 * If written to an active array that has pending writes, then fails.
3795 * fully active: IO and resync can be happening.
3796 * When written to inactive array, starts with resync
3799 * clean, but writes are blocked waiting for 'active' to be written.
3802 * like active, but no writes have been seen for a while (100msec).
3805 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
3806 write_pending, active_idle, bad_word};
3807 static char *array_states[] = {
3808 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3809 "write-pending", "active-idle", NULL };
3811 static int match_word(const char *word, char **list)
3814 for (n=0; list[n]; n++)
3815 if (cmd_match(word, list[n]))
3821 array_state_show(struct mddev *mddev, char *page)
3823 enum array_state st = inactive;
3836 else if (test_bit(MD_CHANGE_PENDING, &mddev->flags))
3838 else if (mddev->safemode)
3844 if (list_empty(&mddev->disks) &&
3845 mddev->raid_disks == 0 &&
3846 mddev->dev_sectors == 0)
3851 return sprintf(page, "%s\n", array_states[st]);
3854 static int do_md_stop(struct mddev *mddev, int ro, struct block_device *bdev);
3855 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev);
3856 static int do_md_run(struct mddev *mddev);
3857 static int restart_array(struct mddev *mddev);
3860 array_state_store(struct mddev *mddev, const char *buf, size_t len)
3863 enum array_state st = match_word(buf, array_states);
3865 if (mddev->pers && (st == active || st == clean) && mddev->ro != 1) {
3866 /* don't take reconfig_mutex when toggling between
3869 spin_lock(&mddev->lock);
3871 restart_array(mddev);
3872 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
3873 wake_up(&mddev->sb_wait);
3875 } else /* st == clean */ {
3876 restart_array(mddev);
3877 if (atomic_read(&mddev->writes_pending) == 0) {
3878 if (mddev->in_sync == 0) {
3880 if (mddev->safemode == 1)
3881 mddev->safemode = 0;
3882 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
3888 spin_unlock(&mddev->lock);
3891 err = mddev_lock(mddev);
3899 /* stopping an active array */
3900 err = do_md_stop(mddev, 0, NULL);
3903 /* stopping an active array */
3905 err = do_md_stop(mddev, 2, NULL);
3907 err = 0; /* already inactive */
3910 break; /* not supported yet */
3913 err = md_set_readonly(mddev, NULL);
3916 set_disk_ro(mddev->gendisk, 1);
3917 err = do_md_run(mddev);
3923 err = md_set_readonly(mddev, NULL);
3924 else if (mddev->ro == 1)
3925 err = restart_array(mddev);
3928 set_disk_ro(mddev->gendisk, 0);
3932 err = do_md_run(mddev);
3937 restart_array(mddev);
3938 spin_lock(&mddev->lock);
3939 if (atomic_read(&mddev->writes_pending) == 0) {
3940 if (mddev->in_sync == 0) {
3942 if (mddev->safemode == 1)
3943 mddev->safemode = 0;
3944 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
3949 spin_unlock(&mddev->lock);
3955 restart_array(mddev);
3956 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
3957 wake_up(&mddev->sb_wait);
3961 set_disk_ro(mddev->gendisk, 0);
3962 err = do_md_run(mddev);
3967 /* these cannot be set */
3972 if (mddev->hold_active == UNTIL_IOCTL)
3973 mddev->hold_active = 0;
3974 sysfs_notify_dirent_safe(mddev->sysfs_state);
3976 mddev_unlock(mddev);
3979 static struct md_sysfs_entry md_array_state =
3980 __ATTR_PREALLOC(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
3983 max_corrected_read_errors_show(struct mddev *mddev, char *page) {
3984 return sprintf(page, "%d\n",
3985 atomic_read(&mddev->max_corr_read_errors));
3989 max_corrected_read_errors_store(struct mddev *mddev, const char *buf, size_t len)
3994 rv = kstrtouint(buf, 10, &n);
3997 atomic_set(&mddev->max_corr_read_errors, n);
4001 static struct md_sysfs_entry max_corr_read_errors =
4002 __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show,
4003 max_corrected_read_errors_store);
4006 null_show(struct mddev *mddev, char *page)
4012 new_dev_store(struct mddev *mddev, const char *buf, size_t len)
4014 /* buf must be %d:%d\n? giving major and minor numbers */
4015 /* The new device is added to the array.
4016 * If the array has a persistent superblock, we read the
4017 * superblock to initialise info and check validity.
4018 * Otherwise, only checking done is that in bind_rdev_to_array,
4019 * which mainly checks size.
4022 int major = simple_strtoul(buf, &e, 10);
4025 struct md_rdev *rdev;
4028 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
4030 minor = simple_strtoul(e+1, &e, 10);
4031 if (*e && *e != '\n')
4033 dev = MKDEV(major, minor);
4034 if (major != MAJOR(dev) ||
4035 minor != MINOR(dev))
4038 flush_workqueue(md_misc_wq);
4040 err = mddev_lock(mddev);
4043 if (mddev->persistent) {
4044 rdev = md_import_device(dev, mddev->major_version,
4045 mddev->minor_version);
4046 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
4047 struct md_rdev *rdev0
4048 = list_entry(mddev->disks.next,
4049 struct md_rdev, same_set);
4050 err = super_types[mddev->major_version]
4051 .load_super(rdev, rdev0, mddev->minor_version);
4055 } else if (mddev->external)
4056 rdev = md_import_device(dev, -2, -1);
4058 rdev = md_import_device(dev, -1, -1);
4061 mddev_unlock(mddev);
4062 return PTR_ERR(rdev);
4064 err = bind_rdev_to_array(rdev, mddev);
4068 mddev_unlock(mddev);
4069 return err ? err : len;
4072 static struct md_sysfs_entry md_new_device =
4073 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
4076 bitmap_store(struct mddev *mddev, const char *buf, size_t len)
4079 unsigned long chunk, end_chunk;
4082 err = mddev_lock(mddev);
4087 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
4089 chunk = end_chunk = simple_strtoul(buf, &end, 0);
4090 if (buf == end) break;
4091 if (*end == '-') { /* range */
4093 end_chunk = simple_strtoul(buf, &end, 0);
4094 if (buf == end) break;
4096 if (*end && !isspace(*end)) break;
4097 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
4098 buf = skip_spaces(end);
4100 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
4102 mddev_unlock(mddev);
4106 static struct md_sysfs_entry md_bitmap =
4107 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
4110 size_show(struct mddev *mddev, char *page)
4112 return sprintf(page, "%llu\n",
4113 (unsigned long long)mddev->dev_sectors / 2);
4116 static int update_size(struct mddev *mddev, sector_t num_sectors);
4119 size_store(struct mddev *mddev, const char *buf, size_t len)
4121 /* If array is inactive, we can reduce the component size, but
4122 * not increase it (except from 0).
4123 * If array is active, we can try an on-line resize
4126 int err = strict_blocks_to_sectors(buf, §ors);
4130 err = mddev_lock(mddev);
4134 err = update_size(mddev, sectors);
4135 md_update_sb(mddev, 1);
4137 if (mddev->dev_sectors == 0 ||
4138 mddev->dev_sectors > sectors)
4139 mddev->dev_sectors = sectors;
4143 mddev_unlock(mddev);
4144 return err ? err : len;
4147 static struct md_sysfs_entry md_size =
4148 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
4150 /* Metadata version.
4152 * 'none' for arrays with no metadata (good luck...)
4153 * 'external' for arrays with externally managed metadata,
4154 * or N.M for internally known formats
4157 metadata_show(struct mddev *mddev, char *page)
4159 if (mddev->persistent)
4160 return sprintf(page, "%d.%d\n",
4161 mddev->major_version, mddev->minor_version);
4162 else if (mddev->external)
4163 return sprintf(page, "external:%s\n", mddev->metadata_type);
4165 return sprintf(page, "none\n");
4169 metadata_store(struct mddev *mddev, const char *buf, size_t len)
4174 /* Changing the details of 'external' metadata is
4175 * always permitted. Otherwise there must be
4176 * no devices attached to the array.
4179 err = mddev_lock(mddev);
4183 if (mddev->external && strncmp(buf, "external:", 9) == 0)
4185 else if (!list_empty(&mddev->disks))
4189 if (cmd_match(buf, "none")) {
4190 mddev->persistent = 0;
4191 mddev->external = 0;
4192 mddev->major_version = 0;
4193 mddev->minor_version = 90;
4196 if (strncmp(buf, "external:", 9) == 0) {
4197 size_t namelen = len-9;
4198 if (namelen >= sizeof(mddev->metadata_type))
4199 namelen = sizeof(mddev->metadata_type)-1;
4200 strncpy(mddev->metadata_type, buf+9, namelen);
4201 mddev->metadata_type[namelen] = 0;
4202 if (namelen && mddev->metadata_type[namelen-1] == '\n')
4203 mddev->metadata_type[--namelen] = 0;
4204 mddev->persistent = 0;
4205 mddev->external = 1;
4206 mddev->major_version = 0;
4207 mddev->minor_version = 90;
4210 major = simple_strtoul(buf, &e, 10);
4212 if (e==buf || *e != '.')
4215 minor = simple_strtoul(buf, &e, 10);
4216 if (e==buf || (*e && *e != '\n') )
4219 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
4221 mddev->major_version = major;
4222 mddev->minor_version = minor;
4223 mddev->persistent = 1;
4224 mddev->external = 0;
4227 mddev_unlock(mddev);
4231 static struct md_sysfs_entry md_metadata =
4232 __ATTR_PREALLOC(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
4235 action_show(struct mddev *mddev, char *page)
4237 char *type = "idle";
4238 unsigned long recovery = mddev->recovery;
4239 if (test_bit(MD_RECOVERY_FROZEN, &recovery))
4241 else if (test_bit(MD_RECOVERY_RUNNING, &recovery) ||
4242 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &recovery))) {
4243 if (test_bit(MD_RECOVERY_RESHAPE, &recovery))
4245 else if (test_bit(MD_RECOVERY_SYNC, &recovery)) {
4246 if (!test_bit(MD_RECOVERY_REQUESTED, &recovery))
4248 else if (test_bit(MD_RECOVERY_CHECK, &recovery))
4252 } else if (test_bit(MD_RECOVERY_RECOVER, &recovery))
4254 else if (mddev->reshape_position != MaxSector)
4257 return sprintf(page, "%s\n", type);
4261 action_store(struct mddev *mddev, const char *page, size_t len)
4263 if (!mddev->pers || !mddev->pers->sync_request)
4267 if (cmd_match(page, "idle") || cmd_match(page, "frozen")) {
4268 if (cmd_match(page, "frozen"))
4269 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4271 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4272 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
4273 mddev_lock(mddev) == 0) {
4274 flush_workqueue(md_misc_wq);
4275 if (mddev->sync_thread) {
4276 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4277 md_reap_sync_thread(mddev);
4279 mddev_unlock(mddev);
4281 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
4282 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
4284 else if (cmd_match(page, "resync"))
4285 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4286 else if (cmd_match(page, "recover")) {
4287 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4288 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
4289 } else if (cmd_match(page, "reshape")) {
4291 if (mddev->pers->start_reshape == NULL)
4293 err = mddev_lock(mddev);
4295 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4296 err = mddev->pers->start_reshape(mddev);
4297 mddev_unlock(mddev);
4301 sysfs_notify(&mddev->kobj, NULL, "degraded");
4303 if (cmd_match(page, "check"))
4304 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
4305 else if (!cmd_match(page, "repair"))
4307 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4308 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
4309 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
4311 if (mddev->ro == 2) {
4312 /* A write to sync_action is enough to justify
4313 * canceling read-auto mode
4316 md_wakeup_thread(mddev->sync_thread);
4318 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4319 md_wakeup_thread(mddev->thread);
4320 sysfs_notify_dirent_safe(mddev->sysfs_action);
4324 static struct md_sysfs_entry md_scan_mode =
4325 __ATTR_PREALLOC(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
4328 last_sync_action_show(struct mddev *mddev, char *page)
4330 return sprintf(page, "%s\n", mddev->last_sync_action);
4333 static struct md_sysfs_entry md_last_scan_mode = __ATTR_RO(last_sync_action);
4336 mismatch_cnt_show(struct mddev *mddev, char *page)
4338 return sprintf(page, "%llu\n",
4339 (unsigned long long)
4340 atomic64_read(&mddev->resync_mismatches));
4343 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
4346 sync_min_show(struct mddev *mddev, char *page)
4348 return sprintf(page, "%d (%s)\n", speed_min(mddev),
4349 mddev->sync_speed_min ? "local": "system");
4353 sync_min_store(struct mddev *mddev, const char *buf, size_t len)
4358 if (strncmp(buf, "system", 6)==0) {
4361 rv = kstrtouint(buf, 10, &min);
4367 mddev->sync_speed_min = min;
4371 static struct md_sysfs_entry md_sync_min =
4372 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
4375 sync_max_show(struct mddev *mddev, char *page)
4377 return sprintf(page, "%d (%s)\n", speed_max(mddev),
4378 mddev->sync_speed_max ? "local": "system");
4382 sync_max_store(struct mddev *mddev, const char *buf, size_t len)
4387 if (strncmp(buf, "system", 6)==0) {
4390 rv = kstrtouint(buf, 10, &max);
4396 mddev->sync_speed_max = max;
4400 static struct md_sysfs_entry md_sync_max =
4401 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
4404 degraded_show(struct mddev *mddev, char *page)
4406 return sprintf(page, "%d\n", mddev->degraded);
4408 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
4411 sync_force_parallel_show(struct mddev *mddev, char *page)
4413 return sprintf(page, "%d\n", mddev->parallel_resync);
4417 sync_force_parallel_store(struct mddev *mddev, const char *buf, size_t len)
4421 if (kstrtol(buf, 10, &n))
4424 if (n != 0 && n != 1)
4427 mddev->parallel_resync = n;
4429 if (mddev->sync_thread)
4430 wake_up(&resync_wait);
4435 /* force parallel resync, even with shared block devices */
4436 static struct md_sysfs_entry md_sync_force_parallel =
4437 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
4438 sync_force_parallel_show, sync_force_parallel_store);
4441 sync_speed_show(struct mddev *mddev, char *page)
4443 unsigned long resync, dt, db;
4444 if (mddev->curr_resync == 0)
4445 return sprintf(page, "none\n");
4446 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
4447 dt = (jiffies - mddev->resync_mark) / HZ;
4449 db = resync - mddev->resync_mark_cnt;
4450 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
4453 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
4456 sync_completed_show(struct mddev *mddev, char *page)
4458 unsigned long long max_sectors, resync;
4460 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4461 return sprintf(page, "none\n");
4463 if (mddev->curr_resync == 1 ||
4464 mddev->curr_resync == 2)
4465 return sprintf(page, "delayed\n");
4467 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
4468 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
4469 max_sectors = mddev->resync_max_sectors;
4471 max_sectors = mddev->dev_sectors;
4473 resync = mddev->curr_resync_completed;
4474 return sprintf(page, "%llu / %llu\n", resync, max_sectors);
4477 static struct md_sysfs_entry md_sync_completed =
4478 __ATTR_PREALLOC(sync_completed, S_IRUGO, sync_completed_show, NULL);
4481 min_sync_show(struct mddev *mddev, char *page)
4483 return sprintf(page, "%llu\n",
4484 (unsigned long long)mddev->resync_min);
4487 min_sync_store(struct mddev *mddev, const char *buf, size_t len)
4489 unsigned long long min;
4492 if (kstrtoull(buf, 10, &min))
4495 spin_lock(&mddev->lock);
4497 if (min > mddev->resync_max)
4501 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4504 /* Round down to multiple of 4K for safety */
4505 mddev->resync_min = round_down(min, 8);
4509 spin_unlock(&mddev->lock);
4513 static struct md_sysfs_entry md_min_sync =
4514 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
4517 max_sync_show(struct mddev *mddev, char *page)
4519 if (mddev->resync_max == MaxSector)
4520 return sprintf(page, "max\n");
4522 return sprintf(page, "%llu\n",
4523 (unsigned long long)mddev->resync_max);
4526 max_sync_store(struct mddev *mddev, const char *buf, size_t len)
4529 spin_lock(&mddev->lock);
4530 if (strncmp(buf, "max", 3) == 0)
4531 mddev->resync_max = MaxSector;
4533 unsigned long long max;
4537 if (kstrtoull(buf, 10, &max))
4539 if (max < mddev->resync_min)
4543 if (max < mddev->resync_max &&
4545 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4548 /* Must be a multiple of chunk_size */
4549 chunk = mddev->chunk_sectors;
4551 sector_t temp = max;
4554 if (sector_div(temp, chunk))
4557 mddev->resync_max = max;
4559 wake_up(&mddev->recovery_wait);
4562 spin_unlock(&mddev->lock);
4566 static struct md_sysfs_entry md_max_sync =
4567 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
4570 suspend_lo_show(struct mddev *mddev, char *page)
4572 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
4576 suspend_lo_store(struct mddev *mddev, const char *buf, size_t len)
4578 unsigned long long old, new;
4581 err = kstrtoull(buf, 10, &new);
4584 if (new != (sector_t)new)
4587 err = mddev_lock(mddev);
4591 if (mddev->pers == NULL ||
4592 mddev->pers->quiesce == NULL)
4594 old = mddev->suspend_lo;
4595 mddev->suspend_lo = new;
4597 /* Shrinking suspended region */
4598 mddev->pers->quiesce(mddev, 2);
4600 /* Expanding suspended region - need to wait */
4601 mddev->pers->quiesce(mddev, 1);
4602 mddev->pers->quiesce(mddev, 0);
4606 mddev_unlock(mddev);
4609 static struct md_sysfs_entry md_suspend_lo =
4610 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
4613 suspend_hi_show(struct mddev *mddev, char *page)
4615 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
4619 suspend_hi_store(struct mddev *mddev, const char *buf, size_t len)
4621 unsigned long long old, new;
4624 err = kstrtoull(buf, 10, &new);
4627 if (new != (sector_t)new)
4630 err = mddev_lock(mddev);
4634 if (mddev->pers == NULL ||
4635 mddev->pers->quiesce == NULL)
4637 old = mddev->suspend_hi;
4638 mddev->suspend_hi = new;
4640 /* Shrinking suspended region */
4641 mddev->pers->quiesce(mddev, 2);
4643 /* Expanding suspended region - need to wait */
4644 mddev->pers->quiesce(mddev, 1);
4645 mddev->pers->quiesce(mddev, 0);
4649 mddev_unlock(mddev);
4652 static struct md_sysfs_entry md_suspend_hi =
4653 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
4656 reshape_position_show(struct mddev *mddev, char *page)
4658 if (mddev->reshape_position != MaxSector)
4659 return sprintf(page, "%llu\n",
4660 (unsigned long long)mddev->reshape_position);
4661 strcpy(page, "none\n");
4666 reshape_position_store(struct mddev *mddev, const char *buf, size_t len)
4668 struct md_rdev *rdev;
4669 unsigned long long new;
4672 err = kstrtoull(buf, 10, &new);
4675 if (new != (sector_t)new)
4677 err = mddev_lock(mddev);
4683 mddev->reshape_position = new;
4684 mddev->delta_disks = 0;
4685 mddev->reshape_backwards = 0;
4686 mddev->new_level = mddev->level;
4687 mddev->new_layout = mddev->layout;
4688 mddev->new_chunk_sectors = mddev->chunk_sectors;
4689 rdev_for_each(rdev, mddev)
4690 rdev->new_data_offset = rdev->data_offset;
4693 mddev_unlock(mddev);
4697 static struct md_sysfs_entry md_reshape_position =
4698 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
4699 reshape_position_store);
4702 reshape_direction_show(struct mddev *mddev, char *page)
4704 return sprintf(page, "%s\n",
4705 mddev->reshape_backwards ? "backwards" : "forwards");
4709 reshape_direction_store(struct mddev *mddev, const char *buf, size_t len)
4714 if (cmd_match(buf, "forwards"))
4716 else if (cmd_match(buf, "backwards"))
4720 if (mddev->reshape_backwards == backwards)
4723 err = mddev_lock(mddev);
4726 /* check if we are allowed to change */
4727 if (mddev->delta_disks)
4729 else if (mddev->persistent &&
4730 mddev->major_version == 0)
4733 mddev->reshape_backwards = backwards;
4734 mddev_unlock(mddev);
4738 static struct md_sysfs_entry md_reshape_direction =
4739 __ATTR(reshape_direction, S_IRUGO|S_IWUSR, reshape_direction_show,
4740 reshape_direction_store);
4743 array_size_show(struct mddev *mddev, char *page)
4745 if (mddev->external_size)
4746 return sprintf(page, "%llu\n",
4747 (unsigned long long)mddev->array_sectors/2);
4749 return sprintf(page, "default\n");
4753 array_size_store(struct mddev *mddev, const char *buf, size_t len)
4758 err = mddev_lock(mddev);
4762 if (strncmp(buf, "default", 7) == 0) {
4764 sectors = mddev->pers->size(mddev, 0, 0);
4766 sectors = mddev->array_sectors;
4768 mddev->external_size = 0;
4770 if (strict_blocks_to_sectors(buf, §ors) < 0)
4772 else if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors)
4775 mddev->external_size = 1;
4779 mddev->array_sectors = sectors;
4781 set_capacity(mddev->gendisk, mddev->array_sectors);
4782 revalidate_disk(mddev->gendisk);
4785 mddev_unlock(mddev);
4789 static struct md_sysfs_entry md_array_size =
4790 __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show,
4793 static struct attribute *md_default_attrs[] = {
4796 &md_raid_disks.attr,
4797 &md_chunk_size.attr,
4799 &md_resync_start.attr,
4801 &md_new_device.attr,
4802 &md_safe_delay.attr,
4803 &md_array_state.attr,
4804 &md_reshape_position.attr,
4805 &md_reshape_direction.attr,
4806 &md_array_size.attr,
4807 &max_corr_read_errors.attr,
4811 static struct attribute *md_redundancy_attrs[] = {
4813 &md_last_scan_mode.attr,
4814 &md_mismatches.attr,
4817 &md_sync_speed.attr,
4818 &md_sync_force_parallel.attr,
4819 &md_sync_completed.attr,
4822 &md_suspend_lo.attr,
4823 &md_suspend_hi.attr,
4828 static struct attribute_group md_redundancy_group = {
4830 .attrs = md_redundancy_attrs,
4834 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
4836 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
4837 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
4842 spin_lock(&all_mddevs_lock);
4843 if (list_empty(&mddev->all_mddevs)) {
4844 spin_unlock(&all_mddevs_lock);
4848 spin_unlock(&all_mddevs_lock);
4850 rv = entry->show(mddev, page);
4856 md_attr_store(struct kobject *kobj, struct attribute *attr,
4857 const char *page, size_t length)
4859 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
4860 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
4865 if (!capable(CAP_SYS_ADMIN))
4867 spin_lock(&all_mddevs_lock);
4868 if (list_empty(&mddev->all_mddevs)) {
4869 spin_unlock(&all_mddevs_lock);
4873 spin_unlock(&all_mddevs_lock);
4874 rv = entry->store(mddev, page, length);
4879 static void md_free(struct kobject *ko)
4881 struct mddev *mddev = container_of(ko, struct mddev, kobj);
4883 if (mddev->sysfs_state)
4884 sysfs_put(mddev->sysfs_state);
4887 blk_cleanup_queue(mddev->queue);
4888 if (mddev->gendisk) {
4889 del_gendisk(mddev->gendisk);
4890 put_disk(mddev->gendisk);
4896 static const struct sysfs_ops md_sysfs_ops = {
4897 .show = md_attr_show,
4898 .store = md_attr_store,
4900 static struct kobj_type md_ktype = {
4902 .sysfs_ops = &md_sysfs_ops,
4903 .default_attrs = md_default_attrs,
4908 static void mddev_delayed_delete(struct work_struct *ws)
4910 struct mddev *mddev = container_of(ws, struct mddev, del_work);
4912 sysfs_remove_group(&mddev->kobj, &md_bitmap_group);
4913 kobject_del(&mddev->kobj);
4914 kobject_put(&mddev->kobj);
4917 static int md_alloc(dev_t dev, char *name)
4919 static DEFINE_MUTEX(disks_mutex);
4920 struct mddev *mddev = mddev_find(dev);
4921 struct gendisk *disk;
4930 partitioned = (MAJOR(mddev->unit) != MD_MAJOR);
4931 shift = partitioned ? MdpMinorShift : 0;
4932 unit = MINOR(mddev->unit) >> shift;
4934 /* wait for any previous instance of this device to be
4935 * completely removed (mddev_delayed_delete).
4937 flush_workqueue(md_misc_wq);
4939 mutex_lock(&disks_mutex);
4945 /* Need to ensure that 'name' is not a duplicate.
4947 struct mddev *mddev2;
4948 spin_lock(&all_mddevs_lock);
4950 list_for_each_entry(mddev2, &all_mddevs, all_mddevs)
4951 if (mddev2->gendisk &&
4952 strcmp(mddev2->gendisk->disk_name, name) == 0) {
4953 spin_unlock(&all_mddevs_lock);
4956 spin_unlock(&all_mddevs_lock);
4960 mddev->queue = blk_alloc_queue(GFP_KERNEL);
4963 mddev->queue->queuedata = mddev;
4965 blk_queue_make_request(mddev->queue, md_make_request);
4966 blk_set_stacking_limits(&mddev->queue->limits);
4968 disk = alloc_disk(1 << shift);
4970 blk_cleanup_queue(mddev->queue);
4971 mddev->queue = NULL;
4974 disk->major = MAJOR(mddev->unit);
4975 disk->first_minor = unit << shift;
4977 strcpy(disk->disk_name, name);
4978 else if (partitioned)
4979 sprintf(disk->disk_name, "md_d%d", unit);
4981 sprintf(disk->disk_name, "md%d", unit);
4982 disk->fops = &md_fops;
4983 disk->private_data = mddev;
4984 disk->queue = mddev->queue;
4985 blk_queue_flush(mddev->queue, REQ_FLUSH | REQ_FUA);
4986 /* Allow extended partitions. This makes the
4987 * 'mdp' device redundant, but we can't really
4990 disk->flags |= GENHD_FL_EXT_DEVT;
4991 mddev->gendisk = disk;
4992 /* As soon as we call add_disk(), another thread could get
4993 * through to md_open, so make sure it doesn't get too far
4995 mutex_lock(&mddev->open_mutex);
4998 error = kobject_init_and_add(&mddev->kobj, &md_ktype,
4999 &disk_to_dev(disk)->kobj, "%s", "md");
5001 /* This isn't possible, but as kobject_init_and_add is marked
5002 * __must_check, we must do something with the result
5004 printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
5008 if (mddev->kobj.sd &&
5009 sysfs_create_group(&mddev->kobj, &md_bitmap_group))
5010 printk(KERN_DEBUG "pointless warning\n");
5011 mutex_unlock(&mddev->open_mutex);
5013 mutex_unlock(&disks_mutex);
5014 if (!error && mddev->kobj.sd) {
5015 kobject_uevent(&mddev->kobj, KOBJ_ADD);
5016 mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state");
5022 static struct kobject *md_probe(dev_t dev, int *part, void *data)
5024 md_alloc(dev, NULL);
5028 static int add_named_array(const char *val, struct kernel_param *kp)
5030 /* val must be "md_*" where * is not all digits.
5031 * We allocate an array with a large free minor number, and
5032 * set the name to val. val must not already be an active name.
5034 int len = strlen(val);
5035 char buf[DISK_NAME_LEN];
5037 while (len && val[len-1] == '\n')
5039 if (len >= DISK_NAME_LEN)
5041 strlcpy(buf, val, len+1);
5042 if (strncmp(buf, "md_", 3) != 0)
5044 return md_alloc(0, buf);
5047 static void md_safemode_timeout(unsigned long data)
5049 struct mddev *mddev = (struct mddev *) data;
5051 if (!atomic_read(&mddev->writes_pending)) {
5052 mddev->safemode = 1;
5053 if (mddev->external)
5054 sysfs_notify_dirent_safe(mddev->sysfs_state);
5056 md_wakeup_thread(mddev->thread);
5059 static int start_dirty_degraded;
5061 int md_run(struct mddev *mddev)
5064 struct md_rdev *rdev;
5065 struct md_personality *pers;
5067 if (list_empty(&mddev->disks))
5068 /* cannot run an array with no devices.. */
5073 /* Cannot run until previous stop completes properly */
5074 if (mddev->sysfs_active)
5078 * Analyze all RAID superblock(s)
5080 if (!mddev->raid_disks) {
5081 if (!mddev->persistent)
5086 if (mddev->level != LEVEL_NONE)
5087 request_module("md-level-%d", mddev->level);
5088 else if (mddev->clevel[0])
5089 request_module("md-%s", mddev->clevel);
5092 * Drop all container device buffers, from now on
5093 * the only valid external interface is through the md
5096 rdev_for_each(rdev, mddev) {
5097 if (test_bit(Faulty, &rdev->flags))
5099 sync_blockdev(rdev->bdev);
5100 invalidate_bdev(rdev->bdev);
5102 /* perform some consistency tests on the device.
5103 * We don't want the data to overlap the metadata,
5104 * Internal Bitmap issues have been handled elsewhere.
5106 if (rdev->meta_bdev) {
5107 /* Nothing to check */;
5108 } else if (rdev->data_offset < rdev->sb_start) {
5109 if (mddev->dev_sectors &&
5110 rdev->data_offset + mddev->dev_sectors
5112 printk("md: %s: data overlaps metadata\n",
5117 if (rdev->sb_start + rdev->sb_size/512
5118 > rdev->data_offset) {
5119 printk("md: %s: metadata overlaps data\n",
5124 sysfs_notify_dirent_safe(rdev->sysfs_state);
5127 if (mddev->bio_set == NULL)
5128 mddev->bio_set = bioset_create(BIO_POOL_SIZE, 0);
5130 spin_lock(&pers_lock);
5131 pers = find_pers(mddev->level, mddev->clevel);
5132 if (!pers || !try_module_get(pers->owner)) {
5133 spin_unlock(&pers_lock);
5134 if (mddev->level != LEVEL_NONE)
5135 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
5138 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
5142 spin_unlock(&pers_lock);
5143 if (mddev->level != pers->level) {
5144 mddev->level = pers->level;
5145 mddev->new_level = pers->level;
5147 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
5149 if (mddev->reshape_position != MaxSector &&
5150 pers->start_reshape == NULL) {
5151 /* This personality cannot handle reshaping... */
5152 module_put(pers->owner);
5156 if (pers->sync_request) {
5157 /* Warn if this is a potentially silly
5160 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
5161 struct md_rdev *rdev2;
5164 rdev_for_each(rdev, mddev)
5165 rdev_for_each(rdev2, mddev) {
5167 rdev->bdev->bd_contains ==
5168 rdev2->bdev->bd_contains) {
5170 "%s: WARNING: %s appears to be"
5171 " on the same physical disk as"
5174 bdevname(rdev->bdev,b),
5175 bdevname(rdev2->bdev,b2));
5182 "True protection against single-disk"
5183 " failure might be compromised.\n");
5186 mddev->recovery = 0;
5187 /* may be over-ridden by personality */
5188 mddev->resync_max_sectors = mddev->dev_sectors;
5190 mddev->ok_start_degraded = start_dirty_degraded;
5192 if (start_readonly && mddev->ro == 0)
5193 mddev->ro = 2; /* read-only, but switch on first write */
5195 err = pers->run(mddev);
5197 printk(KERN_ERR "md: pers->run() failed ...\n");
5198 else if (pers->size(mddev, 0, 0) < mddev->array_sectors) {
5199 WARN_ONCE(!mddev->external_size, "%s: default size too small,"
5200 " but 'external_size' not in effect?\n", __func__);
5202 "md: invalid array_size %llu > default size %llu\n",
5203 (unsigned long long)mddev->array_sectors / 2,
5204 (unsigned long long)pers->size(mddev, 0, 0) / 2);
5207 if (err == 0 && pers->sync_request &&
5208 (mddev->bitmap_info.file || mddev->bitmap_info.offset)) {
5209 struct bitmap *bitmap;
5211 bitmap = bitmap_create(mddev, -1);
5212 if (IS_ERR(bitmap)) {
5213 err = PTR_ERR(bitmap);
5214 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
5215 mdname(mddev), err);
5217 mddev->bitmap = bitmap;
5221 mddev_detach(mddev);
5223 pers->free(mddev, mddev->private);
5224 mddev->private = NULL;
5225 module_put(pers->owner);
5226 bitmap_destroy(mddev);
5230 mddev->queue->backing_dev_info.congested_data = mddev;
5231 mddev->queue->backing_dev_info.congested_fn = md_congested;
5233 if (pers->sync_request) {
5234 if (mddev->kobj.sd &&
5235 sysfs_create_group(&mddev->kobj, &md_redundancy_group))
5237 "md: cannot register extra attributes for %s\n",
5239 mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action");
5240 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
5243 atomic_set(&mddev->writes_pending,0);
5244 atomic_set(&mddev->max_corr_read_errors,
5245 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS);
5246 mddev->safemode = 0;
5247 if (mddev_is_clustered(mddev))
5248 mddev->safemode_delay = 0;
5250 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
5253 spin_lock(&mddev->lock);
5256 spin_unlock(&mddev->lock);
5257 rdev_for_each(rdev, mddev)
5258 if (rdev->raid_disk >= 0)
5259 if (sysfs_link_rdev(mddev, rdev))
5260 /* failure here is OK */;
5262 if (mddev->degraded && !mddev->ro)
5263 /* This ensures that recovering status is reported immediately
5264 * via sysfs - until a lack of spares is confirmed.
5266 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
5267 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5269 if (mddev->flags & MD_UPDATE_SB_FLAGS)
5270 md_update_sb(mddev, 0);
5272 md_new_event(mddev);
5273 sysfs_notify_dirent_safe(mddev->sysfs_state);
5274 sysfs_notify_dirent_safe(mddev->sysfs_action);
5275 sysfs_notify(&mddev->kobj, NULL, "degraded");
5278 EXPORT_SYMBOL_GPL(md_run);
5280 static int do_md_run(struct mddev *mddev)
5284 err = md_run(mddev);
5287 err = bitmap_load(mddev);
5289 bitmap_destroy(mddev);
5293 if (mddev_is_clustered(mddev))
5294 md_allow_write(mddev);
5296 md_wakeup_thread(mddev->thread);
5297 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
5299 set_capacity(mddev->gendisk, mddev->array_sectors);
5300 revalidate_disk(mddev->gendisk);
5302 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
5307 static int restart_array(struct mddev *mddev)
5309 struct gendisk *disk = mddev->gendisk;
5311 /* Complain if it has no devices */
5312 if (list_empty(&mddev->disks))
5318 mddev->safemode = 0;
5320 set_disk_ro(disk, 0);
5321 printk(KERN_INFO "md: %s switched to read-write mode.\n",
5323 /* Kick recovery or resync if necessary */
5324 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5325 md_wakeup_thread(mddev->thread);
5326 md_wakeup_thread(mddev->sync_thread);
5327 sysfs_notify_dirent_safe(mddev->sysfs_state);
5331 static void md_clean(struct mddev *mddev)
5333 mddev->array_sectors = 0;
5334 mddev->external_size = 0;
5335 mddev->dev_sectors = 0;
5336 mddev->raid_disks = 0;
5337 mddev->recovery_cp = 0;
5338 mddev->resync_min = 0;
5339 mddev->resync_max = MaxSector;
5340 mddev->reshape_position = MaxSector;
5341 mddev->external = 0;
5342 mddev->persistent = 0;
5343 mddev->level = LEVEL_NONE;
5344 mddev->clevel[0] = 0;
5347 mddev->metadata_type[0] = 0;
5348 mddev->chunk_sectors = 0;
5349 mddev->ctime = mddev->utime = 0;
5351 mddev->max_disks = 0;
5353 mddev->can_decrease_events = 0;
5354 mddev->delta_disks = 0;
5355 mddev->reshape_backwards = 0;
5356 mddev->new_level = LEVEL_NONE;
5357 mddev->new_layout = 0;
5358 mddev->new_chunk_sectors = 0;
5359 mddev->curr_resync = 0;
5360 atomic64_set(&mddev->resync_mismatches, 0);
5361 mddev->suspend_lo = mddev->suspend_hi = 0;
5362 mddev->sync_speed_min = mddev->sync_speed_max = 0;
5363 mddev->recovery = 0;
5366 mddev->degraded = 0;
5367 mddev->safemode = 0;
5368 mddev->private = NULL;
5369 mddev->bitmap_info.offset = 0;
5370 mddev->bitmap_info.default_offset = 0;
5371 mddev->bitmap_info.default_space = 0;
5372 mddev->bitmap_info.chunksize = 0;
5373 mddev->bitmap_info.daemon_sleep = 0;
5374 mddev->bitmap_info.max_write_behind = 0;
5377 static void __md_stop_writes(struct mddev *mddev)
5379 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5380 flush_workqueue(md_misc_wq);
5381 if (mddev->sync_thread) {
5382 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5383 md_reap_sync_thread(mddev);
5386 del_timer_sync(&mddev->safemode_timer);
5388 bitmap_flush(mddev);
5389 md_super_wait(mddev);
5391 if (mddev->ro == 0 &&
5392 ((!mddev->in_sync && !mddev_is_clustered(mddev)) ||
5393 (mddev->flags & MD_UPDATE_SB_FLAGS))) {
5394 /* mark array as shutdown cleanly */
5395 if (!mddev_is_clustered(mddev))
5397 md_update_sb(mddev, 1);
5401 void md_stop_writes(struct mddev *mddev)
5403 mddev_lock_nointr(mddev);
5404 __md_stop_writes(mddev);
5405 mddev_unlock(mddev);
5407 EXPORT_SYMBOL_GPL(md_stop_writes);
5409 static void mddev_detach(struct mddev *mddev)
5411 struct bitmap *bitmap = mddev->bitmap;
5412 /* wait for behind writes to complete */
5413 if (bitmap && atomic_read(&bitmap->behind_writes) > 0) {
5414 printk(KERN_INFO "md:%s: behind writes in progress - waiting to stop.\n",
5416 /* need to kick something here to make sure I/O goes? */
5417 wait_event(bitmap->behind_wait,
5418 atomic_read(&bitmap->behind_writes) == 0);
5420 if (mddev->pers && mddev->pers->quiesce) {
5421 mddev->pers->quiesce(mddev, 1);
5422 mddev->pers->quiesce(mddev, 0);
5424 md_unregister_thread(&mddev->thread);
5426 blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/
5429 static void __md_stop(struct mddev *mddev)
5431 struct md_personality *pers = mddev->pers;
5432 mddev_detach(mddev);
5433 /* Ensure ->event_work is done */
5434 flush_workqueue(md_misc_wq);
5435 spin_lock(&mddev->lock);
5438 spin_unlock(&mddev->lock);
5439 pers->free(mddev, mddev->private);
5440 mddev->private = NULL;
5441 if (pers->sync_request && mddev->to_remove == NULL)
5442 mddev->to_remove = &md_redundancy_group;
5443 module_put(pers->owner);
5444 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5447 void md_stop(struct mddev *mddev)
5449 /* stop the array and free an attached data structures.
5450 * This is called from dm-raid
5453 bitmap_destroy(mddev);
5455 bioset_free(mddev->bio_set);
5458 EXPORT_SYMBOL_GPL(md_stop);
5460 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev)
5465 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
5467 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5468 md_wakeup_thread(mddev->thread);
5470 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5471 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5472 if (mddev->sync_thread)
5473 /* Thread might be blocked waiting for metadata update
5474 * which will now never happen */
5475 wake_up_process(mddev->sync_thread->tsk);
5477 if (mddev->external && test_bit(MD_CHANGE_PENDING, &mddev->flags))
5479 mddev_unlock(mddev);
5480 wait_event(resync_wait, !test_bit(MD_RECOVERY_RUNNING,
5482 wait_event(mddev->sb_wait,
5483 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
5484 mddev_lock_nointr(mddev);
5486 mutex_lock(&mddev->open_mutex);
5487 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
5488 mddev->sync_thread ||
5489 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
5490 (bdev && !test_bit(MD_STILL_CLOSED, &mddev->flags))) {
5491 printk("md: %s still in use.\n",mdname(mddev));
5493 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5494 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5495 md_wakeup_thread(mddev->thread);
5501 __md_stop_writes(mddev);
5507 set_disk_ro(mddev->gendisk, 1);
5508 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5509 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5510 md_wakeup_thread(mddev->thread);
5511 sysfs_notify_dirent_safe(mddev->sysfs_state);
5515 mutex_unlock(&mddev->open_mutex);
5520 * 0 - completely stop and dis-assemble array
5521 * 2 - stop but do not disassemble array
5523 static int do_md_stop(struct mddev *mddev, int mode,
5524 struct block_device *bdev)
5526 struct gendisk *disk = mddev->gendisk;
5527 struct md_rdev *rdev;
5530 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
5532 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5533 md_wakeup_thread(mddev->thread);
5535 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5536 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5537 if (mddev->sync_thread)
5538 /* Thread might be blocked waiting for metadata update
5539 * which will now never happen */
5540 wake_up_process(mddev->sync_thread->tsk);
5542 mddev_unlock(mddev);
5543 wait_event(resync_wait, (mddev->sync_thread == NULL &&
5544 !test_bit(MD_RECOVERY_RUNNING,
5545 &mddev->recovery)));
5546 mddev_lock_nointr(mddev);
5548 mutex_lock(&mddev->open_mutex);
5549 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
5550 mddev->sysfs_active ||
5551 mddev->sync_thread ||
5552 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
5553 (bdev && !test_bit(MD_STILL_CLOSED, &mddev->flags))) {
5554 printk("md: %s still in use.\n",mdname(mddev));
5555 mutex_unlock(&mddev->open_mutex);
5557 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5558 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5559 md_wakeup_thread(mddev->thread);
5565 set_disk_ro(disk, 0);
5567 __md_stop_writes(mddev);
5569 mddev->queue->backing_dev_info.congested_fn = NULL;
5571 /* tell userspace to handle 'inactive' */
5572 sysfs_notify_dirent_safe(mddev->sysfs_state);
5574 rdev_for_each(rdev, mddev)
5575 if (rdev->raid_disk >= 0)
5576 sysfs_unlink_rdev(mddev, rdev);
5578 set_capacity(disk, 0);
5579 mutex_unlock(&mddev->open_mutex);
5581 revalidate_disk(disk);
5586 mutex_unlock(&mddev->open_mutex);
5588 * Free resources if final stop
5591 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
5593 bitmap_destroy(mddev);
5594 if (mddev->bitmap_info.file) {
5595 struct file *f = mddev->bitmap_info.file;
5596 spin_lock(&mddev->lock);
5597 mddev->bitmap_info.file = NULL;
5598 spin_unlock(&mddev->lock);
5601 mddev->bitmap_info.offset = 0;
5603 export_array(mddev);
5606 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
5607 if (mddev->hold_active == UNTIL_STOP)
5608 mddev->hold_active = 0;
5610 blk_integrity_unregister(disk);
5611 md_new_event(mddev);
5612 sysfs_notify_dirent_safe(mddev->sysfs_state);
5617 static void autorun_array(struct mddev *mddev)
5619 struct md_rdev *rdev;
5622 if (list_empty(&mddev->disks))
5625 printk(KERN_INFO "md: running: ");
5627 rdev_for_each(rdev, mddev) {
5628 char b[BDEVNAME_SIZE];
5629 printk("<%s>", bdevname(rdev->bdev,b));
5633 err = do_md_run(mddev);
5635 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
5636 do_md_stop(mddev, 0, NULL);
5641 * lets try to run arrays based on all disks that have arrived
5642 * until now. (those are in pending_raid_disks)
5644 * the method: pick the first pending disk, collect all disks with
5645 * the same UUID, remove all from the pending list and put them into
5646 * the 'same_array' list. Then order this list based on superblock
5647 * update time (freshest comes first), kick out 'old' disks and
5648 * compare superblocks. If everything's fine then run it.
5650 * If "unit" is allocated, then bump its reference count
5652 static void autorun_devices(int part)
5654 struct md_rdev *rdev0, *rdev, *tmp;
5655 struct mddev *mddev;
5656 char b[BDEVNAME_SIZE];
5658 printk(KERN_INFO "md: autorun ...\n");
5659 while (!list_empty(&pending_raid_disks)) {
5662 LIST_HEAD(candidates);
5663 rdev0 = list_entry(pending_raid_disks.next,
5664 struct md_rdev, same_set);
5666 printk(KERN_INFO "md: considering %s ...\n",
5667 bdevname(rdev0->bdev,b));
5668 INIT_LIST_HEAD(&candidates);
5669 rdev_for_each_list(rdev, tmp, &pending_raid_disks)
5670 if (super_90_load(rdev, rdev0, 0) >= 0) {
5671 printk(KERN_INFO "md: adding %s ...\n",
5672 bdevname(rdev->bdev,b));
5673 list_move(&rdev->same_set, &candidates);
5676 * now we have a set of devices, with all of them having
5677 * mostly sane superblocks. It's time to allocate the
5681 dev = MKDEV(mdp_major,
5682 rdev0->preferred_minor << MdpMinorShift);
5683 unit = MINOR(dev) >> MdpMinorShift;
5685 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
5688 if (rdev0->preferred_minor != unit) {
5689 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
5690 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
5694 md_probe(dev, NULL, NULL);
5695 mddev = mddev_find(dev);
5696 if (!mddev || !mddev->gendisk) {
5700 "md: cannot allocate memory for md drive.\n");
5703 if (mddev_lock(mddev))
5704 printk(KERN_WARNING "md: %s locked, cannot run\n",
5706 else if (mddev->raid_disks || mddev->major_version
5707 || !list_empty(&mddev->disks)) {
5709 "md: %s already running, cannot run %s\n",
5710 mdname(mddev), bdevname(rdev0->bdev,b));
5711 mddev_unlock(mddev);
5713 printk(KERN_INFO "md: created %s\n", mdname(mddev));
5714 mddev->persistent = 1;
5715 rdev_for_each_list(rdev, tmp, &candidates) {
5716 list_del_init(&rdev->same_set);
5717 if (bind_rdev_to_array(rdev, mddev))
5720 autorun_array(mddev);
5721 mddev_unlock(mddev);
5723 /* on success, candidates will be empty, on error
5726 rdev_for_each_list(rdev, tmp, &candidates) {
5727 list_del_init(&rdev->same_set);
5732 printk(KERN_INFO "md: ... autorun DONE.\n");
5734 #endif /* !MODULE */
5736 static int get_version(void __user *arg)
5740 ver.major = MD_MAJOR_VERSION;
5741 ver.minor = MD_MINOR_VERSION;
5742 ver.patchlevel = MD_PATCHLEVEL_VERSION;
5744 if (copy_to_user(arg, &ver, sizeof(ver)))
5750 static int get_array_info(struct mddev *mddev, void __user *arg)
5752 mdu_array_info_t info;
5753 int nr,working,insync,failed,spare;
5754 struct md_rdev *rdev;
5756 nr = working = insync = failed = spare = 0;
5758 rdev_for_each_rcu(rdev, mddev) {
5760 if (test_bit(Faulty, &rdev->flags))
5764 if (test_bit(In_sync, &rdev->flags))
5772 info.major_version = mddev->major_version;
5773 info.minor_version = mddev->minor_version;
5774 info.patch_version = MD_PATCHLEVEL_VERSION;
5775 info.ctime = mddev->ctime;
5776 info.level = mddev->level;
5777 info.size = mddev->dev_sectors / 2;
5778 if (info.size != mddev->dev_sectors / 2) /* overflow */
5781 info.raid_disks = mddev->raid_disks;
5782 info.md_minor = mddev->md_minor;
5783 info.not_persistent= !mddev->persistent;
5785 info.utime = mddev->utime;
5788 info.state = (1<<MD_SB_CLEAN);
5789 if (mddev->bitmap && mddev->bitmap_info.offset)
5790 info.state |= (1<<MD_SB_BITMAP_PRESENT);
5791 if (mddev_is_clustered(mddev))
5792 info.state |= (1<<MD_SB_CLUSTERED);
5793 info.active_disks = insync;
5794 info.working_disks = working;
5795 info.failed_disks = failed;
5796 info.spare_disks = spare;
5798 info.layout = mddev->layout;
5799 info.chunk_size = mddev->chunk_sectors << 9;
5801 if (copy_to_user(arg, &info, sizeof(info)))
5807 static int get_bitmap_file(struct mddev *mddev, void __user * arg)
5809 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
5813 file = kzalloc(sizeof(*file), GFP_NOIO);
5818 spin_lock(&mddev->lock);
5819 /* bitmap enabled */
5820 if (mddev->bitmap_info.file) {
5821 ptr = file_path(mddev->bitmap_info.file, file->pathname,
5822 sizeof(file->pathname));
5826 memmove(file->pathname, ptr,
5827 sizeof(file->pathname)-(ptr-file->pathname));
5829 spin_unlock(&mddev->lock);
5832 copy_to_user(arg, file, sizeof(*file)))
5839 static int get_disk_info(struct mddev *mddev, void __user * arg)
5841 mdu_disk_info_t info;
5842 struct md_rdev *rdev;
5844 if (copy_from_user(&info, arg, sizeof(info)))
5848 rdev = md_find_rdev_nr_rcu(mddev, info.number);
5850 info.major = MAJOR(rdev->bdev->bd_dev);
5851 info.minor = MINOR(rdev->bdev->bd_dev);
5852 info.raid_disk = rdev->raid_disk;
5854 if (test_bit(Faulty, &rdev->flags))
5855 info.state |= (1<<MD_DISK_FAULTY);
5856 else if (test_bit(In_sync, &rdev->flags)) {
5857 info.state |= (1<<MD_DISK_ACTIVE);
5858 info.state |= (1<<MD_DISK_SYNC);
5859 } else if (test_bit(Journal, &rdev->flags))
5860 info.state |= (1<<MD_DISK_JOURNAL);
5861 if (test_bit(WriteMostly, &rdev->flags))
5862 info.state |= (1<<MD_DISK_WRITEMOSTLY);
5864 info.major = info.minor = 0;
5865 info.raid_disk = -1;
5866 info.state = (1<<MD_DISK_REMOVED);
5870 if (copy_to_user(arg, &info, sizeof(info)))
5876 static int add_new_disk(struct mddev *mddev, mdu_disk_info_t *info)
5878 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
5879 struct md_rdev *rdev;
5880 dev_t dev = MKDEV(info->major,info->minor);
5882 if (mddev_is_clustered(mddev) &&
5883 !(info->state & ((1 << MD_DISK_CLUSTER_ADD) | (1 << MD_DISK_CANDIDATE)))) {
5884 pr_err("%s: Cannot add to clustered mddev.\n",
5889 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
5892 if (!mddev->raid_disks) {
5894 /* expecting a device which has a superblock */
5895 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
5898 "md: md_import_device returned %ld\n",
5900 return PTR_ERR(rdev);
5902 if (!list_empty(&mddev->disks)) {
5903 struct md_rdev *rdev0
5904 = list_entry(mddev->disks.next,
5905 struct md_rdev, same_set);
5906 err = super_types[mddev->major_version]
5907 .load_super(rdev, rdev0, mddev->minor_version);
5910 "md: %s has different UUID to %s\n",
5911 bdevname(rdev->bdev,b),
5912 bdevname(rdev0->bdev,b2));
5917 err = bind_rdev_to_array(rdev, mddev);
5924 * add_new_disk can be used once the array is assembled
5925 * to add "hot spares". They must already have a superblock
5930 if (!mddev->pers->hot_add_disk) {
5932 "%s: personality does not support diskops!\n",
5936 if (mddev->persistent)
5937 rdev = md_import_device(dev, mddev->major_version,
5938 mddev->minor_version);
5940 rdev = md_import_device(dev, -1, -1);
5943 "md: md_import_device returned %ld\n",
5945 return PTR_ERR(rdev);
5947 /* set saved_raid_disk if appropriate */
5948 if (!mddev->persistent) {
5949 if (info->state & (1<<MD_DISK_SYNC) &&
5950 info->raid_disk < mddev->raid_disks) {
5951 rdev->raid_disk = info->raid_disk;
5952 set_bit(In_sync, &rdev->flags);
5953 clear_bit(Bitmap_sync, &rdev->flags);
5955 rdev->raid_disk = -1;
5956 rdev->saved_raid_disk = rdev->raid_disk;
5958 super_types[mddev->major_version].
5959 validate_super(mddev, rdev);
5960 if ((info->state & (1<<MD_DISK_SYNC)) &&
5961 rdev->raid_disk != info->raid_disk) {
5962 /* This was a hot-add request, but events doesn't
5963 * match, so reject it.
5969 clear_bit(In_sync, &rdev->flags); /* just to be sure */
5970 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
5971 set_bit(WriteMostly, &rdev->flags);
5973 clear_bit(WriteMostly, &rdev->flags);
5975 if (info->state & (1<<MD_DISK_JOURNAL))
5976 set_bit(Journal, &rdev->flags);
5978 * check whether the device shows up in other nodes
5980 if (mddev_is_clustered(mddev)) {
5981 if (info->state & (1 << MD_DISK_CANDIDATE))
5982 set_bit(Candidate, &rdev->flags);
5983 else if (info->state & (1 << MD_DISK_CLUSTER_ADD)) {
5984 /* --add initiated by this node */
5985 err = md_cluster_ops->add_new_disk(mddev, rdev);
5993 rdev->raid_disk = -1;
5994 err = bind_rdev_to_array(rdev, mddev);
5999 if (mddev_is_clustered(mddev)) {
6000 if (info->state & (1 << MD_DISK_CANDIDATE))
6001 md_cluster_ops->new_disk_ack(mddev, (err == 0));
6004 md_cluster_ops->add_new_disk_cancel(mddev);
6006 err = add_bound_rdev(rdev);
6010 err = add_bound_rdev(rdev);
6015 /* otherwise, add_new_disk is only allowed
6016 * for major_version==0 superblocks
6018 if (mddev->major_version != 0) {
6019 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
6024 if (!(info->state & (1<<MD_DISK_FAULTY))) {
6026 rdev = md_import_device(dev, -1, 0);
6029 "md: error, md_import_device() returned %ld\n",
6031 return PTR_ERR(rdev);
6033 rdev->desc_nr = info->number;
6034 if (info->raid_disk < mddev->raid_disks)
6035 rdev->raid_disk = info->raid_disk;
6037 rdev->raid_disk = -1;
6039 if (rdev->raid_disk < mddev->raid_disks)
6040 if (info->state & (1<<MD_DISK_SYNC))
6041 set_bit(In_sync, &rdev->flags);
6043 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
6044 set_bit(WriteMostly, &rdev->flags);
6046 if (!mddev->persistent) {
6047 printk(KERN_INFO "md: nonpersistent superblock ...\n");
6048 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
6050 rdev->sb_start = calc_dev_sboffset(rdev);
6051 rdev->sectors = rdev->sb_start;
6053 err = bind_rdev_to_array(rdev, mddev);
6063 static int hot_remove_disk(struct mddev *mddev, dev_t dev)
6065 char b[BDEVNAME_SIZE];
6066 struct md_rdev *rdev;
6069 rdev = find_rdev(mddev, dev);
6073 if (mddev_is_clustered(mddev))
6074 ret = md_cluster_ops->metadata_update_start(mddev);
6076 if (rdev->raid_disk < 0)
6079 clear_bit(Blocked, &rdev->flags);
6080 remove_and_add_spares(mddev, rdev);
6082 if (rdev->raid_disk >= 0)
6086 if (mddev_is_clustered(mddev) && ret == 0)
6087 md_cluster_ops->remove_disk(mddev, rdev);
6089 md_kick_rdev_from_array(rdev);
6090 md_update_sb(mddev, 1);
6091 md_new_event(mddev);
6095 if (mddev_is_clustered(mddev) && ret == 0)
6096 md_cluster_ops->metadata_update_cancel(mddev);
6098 printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n",
6099 bdevname(rdev->bdev,b), mdname(mddev));
6103 static int hot_add_disk(struct mddev *mddev, dev_t dev)
6105 char b[BDEVNAME_SIZE];
6107 struct md_rdev *rdev;
6112 if (mddev->major_version != 0) {
6113 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
6114 " version-0 superblocks.\n",
6118 if (!mddev->pers->hot_add_disk) {
6120 "%s: personality does not support diskops!\n",
6125 rdev = md_import_device(dev, -1, 0);
6128 "md: error, md_import_device() returned %ld\n",
6133 if (mddev->persistent)
6134 rdev->sb_start = calc_dev_sboffset(rdev);
6136 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
6138 rdev->sectors = rdev->sb_start;
6140 if (test_bit(Faulty, &rdev->flags)) {
6142 "md: can not hot-add faulty %s disk to %s!\n",
6143 bdevname(rdev->bdev,b), mdname(mddev));
6148 clear_bit(In_sync, &rdev->flags);
6150 rdev->saved_raid_disk = -1;
6151 err = bind_rdev_to_array(rdev, mddev);
6156 * The rest should better be atomic, we can have disk failures
6157 * noticed in interrupt contexts ...
6160 rdev->raid_disk = -1;
6162 md_update_sb(mddev, 1);
6164 * Kick recovery, maybe this spare has to be added to the
6165 * array immediately.
6167 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6168 md_wakeup_thread(mddev->thread);
6169 md_new_event(mddev);
6177 static int set_bitmap_file(struct mddev *mddev, int fd)
6182 if (!mddev->pers->quiesce || !mddev->thread)
6184 if (mddev->recovery || mddev->sync_thread)
6186 /* we should be able to change the bitmap.. */
6190 struct inode *inode;
6193 if (mddev->bitmap || mddev->bitmap_info.file)
6194 return -EEXIST; /* cannot add when bitmap is present */
6198 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
6203 inode = f->f_mapping->host;
6204 if (!S_ISREG(inode->i_mode)) {
6205 printk(KERN_ERR "%s: error: bitmap file must be a regular file\n",
6208 } else if (!(f->f_mode & FMODE_WRITE)) {
6209 printk(KERN_ERR "%s: error: bitmap file must open for write\n",
6212 } else if (atomic_read(&inode->i_writecount) != 1) {
6213 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
6221 mddev->bitmap_info.file = f;
6222 mddev->bitmap_info.offset = 0; /* file overrides offset */
6223 } else if (mddev->bitmap == NULL)
6224 return -ENOENT; /* cannot remove what isn't there */
6227 mddev->pers->quiesce(mddev, 1);
6229 struct bitmap *bitmap;
6231 bitmap = bitmap_create(mddev, -1);
6232 if (!IS_ERR(bitmap)) {
6233 mddev->bitmap = bitmap;
6234 err = bitmap_load(mddev);
6236 err = PTR_ERR(bitmap);
6238 if (fd < 0 || err) {
6239 bitmap_destroy(mddev);
6240 fd = -1; /* make sure to put the file */
6242 mddev->pers->quiesce(mddev, 0);
6245 struct file *f = mddev->bitmap_info.file;
6247 spin_lock(&mddev->lock);
6248 mddev->bitmap_info.file = NULL;
6249 spin_unlock(&mddev->lock);
6258 * set_array_info is used two different ways
6259 * The original usage is when creating a new array.
6260 * In this usage, raid_disks is > 0 and it together with
6261 * level, size, not_persistent,layout,chunksize determine the
6262 * shape of the array.
6263 * This will always create an array with a type-0.90.0 superblock.
6264 * The newer usage is when assembling an array.
6265 * In this case raid_disks will be 0, and the major_version field is
6266 * use to determine which style super-blocks are to be found on the devices.
6267 * The minor and patch _version numbers are also kept incase the
6268 * super_block handler wishes to interpret them.
6270 static int set_array_info(struct mddev *mddev, mdu_array_info_t *info)
6273 if (info->raid_disks == 0) {
6274 /* just setting version number for superblock loading */
6275 if (info->major_version < 0 ||
6276 info->major_version >= ARRAY_SIZE(super_types) ||
6277 super_types[info->major_version].name == NULL) {
6278 /* maybe try to auto-load a module? */
6280 "md: superblock version %d not known\n",
6281 info->major_version);
6284 mddev->major_version = info->major_version;
6285 mddev->minor_version = info->minor_version;
6286 mddev->patch_version = info->patch_version;
6287 mddev->persistent = !info->not_persistent;
6288 /* ensure mddev_put doesn't delete this now that there
6289 * is some minimal configuration.
6291 mddev->ctime = get_seconds();
6294 mddev->major_version = MD_MAJOR_VERSION;
6295 mddev->minor_version = MD_MINOR_VERSION;
6296 mddev->patch_version = MD_PATCHLEVEL_VERSION;
6297 mddev->ctime = get_seconds();
6299 mddev->level = info->level;
6300 mddev->clevel[0] = 0;
6301 mddev->dev_sectors = 2 * (sector_t)info->size;
6302 mddev->raid_disks = info->raid_disks;
6303 /* don't set md_minor, it is determined by which /dev/md* was
6306 if (info->state & (1<<MD_SB_CLEAN))
6307 mddev->recovery_cp = MaxSector;
6309 mddev->recovery_cp = 0;
6310 mddev->persistent = ! info->not_persistent;
6311 mddev->external = 0;
6313 mddev->layout = info->layout;
6314 mddev->chunk_sectors = info->chunk_size >> 9;
6316 mddev->max_disks = MD_SB_DISKS;
6318 if (mddev->persistent)
6320 set_bit(MD_CHANGE_DEVS, &mddev->flags);
6322 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
6323 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
6324 mddev->bitmap_info.offset = 0;
6326 mddev->reshape_position = MaxSector;
6329 * Generate a 128 bit UUID
6331 get_random_bytes(mddev->uuid, 16);
6333 mddev->new_level = mddev->level;
6334 mddev->new_chunk_sectors = mddev->chunk_sectors;
6335 mddev->new_layout = mddev->layout;
6336 mddev->delta_disks = 0;
6337 mddev->reshape_backwards = 0;
6342 void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors)
6344 WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__);
6346 if (mddev->external_size)
6349 mddev->array_sectors = array_sectors;
6351 EXPORT_SYMBOL(md_set_array_sectors);
6353 static int update_size(struct mddev *mddev, sector_t num_sectors)
6355 struct md_rdev *rdev;
6357 int fit = (num_sectors == 0);
6359 if (mddev->pers->resize == NULL)
6361 /* The "num_sectors" is the number of sectors of each device that
6362 * is used. This can only make sense for arrays with redundancy.
6363 * linear and raid0 always use whatever space is available. We can only
6364 * consider changing this number if no resync or reconstruction is
6365 * happening, and if the new size is acceptable. It must fit before the
6366 * sb_start or, if that is <data_offset, it must fit before the size
6367 * of each device. If num_sectors is zero, we find the largest size
6370 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
6376 rdev_for_each(rdev, mddev) {
6377 sector_t avail = rdev->sectors;
6379 if (fit && (num_sectors == 0 || num_sectors > avail))
6380 num_sectors = avail;
6381 if (avail < num_sectors)
6384 rv = mddev->pers->resize(mddev, num_sectors);
6386 revalidate_disk(mddev->gendisk);
6390 static int update_raid_disks(struct mddev *mddev, int raid_disks)
6393 struct md_rdev *rdev;
6394 /* change the number of raid disks */
6395 if (mddev->pers->check_reshape == NULL)
6399 if (raid_disks <= 0 ||
6400 (mddev->max_disks && raid_disks >= mddev->max_disks))
6402 if (mddev->sync_thread ||
6403 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
6404 mddev->reshape_position != MaxSector)
6407 rdev_for_each(rdev, mddev) {
6408 if (mddev->raid_disks < raid_disks &&
6409 rdev->data_offset < rdev->new_data_offset)
6411 if (mddev->raid_disks > raid_disks &&
6412 rdev->data_offset > rdev->new_data_offset)
6416 mddev->delta_disks = raid_disks - mddev->raid_disks;
6417 if (mddev->delta_disks < 0)
6418 mddev->reshape_backwards = 1;
6419 else if (mddev->delta_disks > 0)
6420 mddev->reshape_backwards = 0;
6422 rv = mddev->pers->check_reshape(mddev);
6424 mddev->delta_disks = 0;
6425 mddev->reshape_backwards = 0;
6431 * update_array_info is used to change the configuration of an
6433 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
6434 * fields in the info are checked against the array.
6435 * Any differences that cannot be handled will cause an error.
6436 * Normally, only one change can be managed at a time.
6438 static int update_array_info(struct mddev *mddev, mdu_array_info_t *info)
6444 /* calculate expected state,ignoring low bits */
6445 if (mddev->bitmap && mddev->bitmap_info.offset)
6446 state |= (1 << MD_SB_BITMAP_PRESENT);
6448 if (mddev->major_version != info->major_version ||
6449 mddev->minor_version != info->minor_version ||
6450 /* mddev->patch_version != info->patch_version || */
6451 mddev->ctime != info->ctime ||
6452 mddev->level != info->level ||
6453 /* mddev->layout != info->layout || */
6454 mddev->persistent != !info->not_persistent ||
6455 mddev->chunk_sectors != info->chunk_size >> 9 ||
6456 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
6457 ((state^info->state) & 0xfffffe00)
6460 /* Check there is only one change */
6461 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
6463 if (mddev->raid_disks != info->raid_disks)
6465 if (mddev->layout != info->layout)
6467 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT))
6474 if (mddev->layout != info->layout) {
6476 * we don't need to do anything at the md level, the
6477 * personality will take care of it all.
6479 if (mddev->pers->check_reshape == NULL)
6482 mddev->new_layout = info->layout;
6483 rv = mddev->pers->check_reshape(mddev);
6485 mddev->new_layout = mddev->layout;
6489 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
6490 rv = update_size(mddev, (sector_t)info->size * 2);
6492 if (mddev->raid_disks != info->raid_disks)
6493 rv = update_raid_disks(mddev, info->raid_disks);
6495 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
6496 if (mddev->pers->quiesce == NULL || mddev->thread == NULL) {
6500 if (mddev->recovery || mddev->sync_thread) {
6504 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
6505 struct bitmap *bitmap;
6506 /* add the bitmap */
6507 if (mddev->bitmap) {
6511 if (mddev->bitmap_info.default_offset == 0) {
6515 mddev->bitmap_info.offset =
6516 mddev->bitmap_info.default_offset;
6517 mddev->bitmap_info.space =
6518 mddev->bitmap_info.default_space;
6519 mddev->pers->quiesce(mddev, 1);
6520 bitmap = bitmap_create(mddev, -1);
6521 if (!IS_ERR(bitmap)) {
6522 mddev->bitmap = bitmap;
6523 rv = bitmap_load(mddev);
6525 rv = PTR_ERR(bitmap);
6527 bitmap_destroy(mddev);
6528 mddev->pers->quiesce(mddev, 0);
6530 /* remove the bitmap */
6531 if (!mddev->bitmap) {
6535 if (mddev->bitmap->storage.file) {
6539 mddev->pers->quiesce(mddev, 1);
6540 bitmap_destroy(mddev);
6541 mddev->pers->quiesce(mddev, 0);
6542 mddev->bitmap_info.offset = 0;
6545 md_update_sb(mddev, 1);
6551 static int set_disk_faulty(struct mddev *mddev, dev_t dev)
6553 struct md_rdev *rdev;
6556 if (mddev->pers == NULL)
6560 rdev = find_rdev_rcu(mddev, dev);
6564 md_error(mddev, rdev);
6565 if (!test_bit(Faulty, &rdev->flags))
6573 * We have a problem here : there is no easy way to give a CHS
6574 * virtual geometry. We currently pretend that we have a 2 heads
6575 * 4 sectors (with a BIG number of cylinders...). This drives
6576 * dosfs just mad... ;-)
6578 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
6580 struct mddev *mddev = bdev->bd_disk->private_data;
6584 geo->cylinders = mddev->array_sectors / 8;
6588 static inline bool md_ioctl_valid(unsigned int cmd)
6593 case GET_ARRAY_INFO:
6594 case GET_BITMAP_FILE:
6597 case HOT_REMOVE_DISK:
6600 case RESTART_ARRAY_RW:
6602 case SET_ARRAY_INFO:
6603 case SET_BITMAP_FILE:
6604 case SET_DISK_FAULTY:
6607 case CLUSTERED_DISK_NACK:
6614 static int md_ioctl(struct block_device *bdev, fmode_t mode,
6615 unsigned int cmd, unsigned long arg)
6618 void __user *argp = (void __user *)arg;
6619 struct mddev *mddev = NULL;
6622 if (!md_ioctl_valid(cmd))
6627 case GET_ARRAY_INFO:
6631 if (!capable(CAP_SYS_ADMIN))
6636 * Commands dealing with the RAID driver but not any
6641 err = get_version(argp);
6647 autostart_arrays(arg);
6654 * Commands creating/starting a new array:
6657 mddev = bdev->bd_disk->private_data;
6664 /* Some actions do not requires the mutex */
6666 case GET_ARRAY_INFO:
6667 if (!mddev->raid_disks && !mddev->external)
6670 err = get_array_info(mddev, argp);
6674 if (!mddev->raid_disks && !mddev->external)
6677 err = get_disk_info(mddev, argp);
6680 case SET_DISK_FAULTY:
6681 err = set_disk_faulty(mddev, new_decode_dev(arg));
6684 case GET_BITMAP_FILE:
6685 err = get_bitmap_file(mddev, argp);
6690 if (cmd == ADD_NEW_DISK)
6691 /* need to ensure md_delayed_delete() has completed */
6692 flush_workqueue(md_misc_wq);
6694 if (cmd == HOT_REMOVE_DISK)
6695 /* need to ensure recovery thread has run */
6696 wait_event_interruptible_timeout(mddev->sb_wait,
6697 !test_bit(MD_RECOVERY_NEEDED,
6699 msecs_to_jiffies(5000));
6700 if (cmd == STOP_ARRAY || cmd == STOP_ARRAY_RO) {
6701 /* Need to flush page cache, and ensure no-one else opens
6704 mutex_lock(&mddev->open_mutex);
6705 if (mddev->pers && atomic_read(&mddev->openers) > 1) {
6706 mutex_unlock(&mddev->open_mutex);
6710 set_bit(MD_STILL_CLOSED, &mddev->flags);
6711 mutex_unlock(&mddev->open_mutex);
6712 sync_blockdev(bdev);
6714 err = mddev_lock(mddev);
6717 "md: ioctl lock interrupted, reason %d, cmd %d\n",
6722 if (cmd == SET_ARRAY_INFO) {
6723 mdu_array_info_t info;
6725 memset(&info, 0, sizeof(info));
6726 else if (copy_from_user(&info, argp, sizeof(info))) {
6731 err = update_array_info(mddev, &info);
6733 printk(KERN_WARNING "md: couldn't update"
6734 " array info. %d\n", err);
6739 if (!list_empty(&mddev->disks)) {
6741 "md: array %s already has disks!\n",
6746 if (mddev->raid_disks) {
6748 "md: array %s already initialised!\n",
6753 err = set_array_info(mddev, &info);
6755 printk(KERN_WARNING "md: couldn't set"
6756 " array info. %d\n", err);
6763 * Commands querying/configuring an existing array:
6765 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
6766 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
6767 if ((!mddev->raid_disks && !mddev->external)
6768 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
6769 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
6770 && cmd != GET_BITMAP_FILE) {
6776 * Commands even a read-only array can execute:
6779 case RESTART_ARRAY_RW:
6780 err = restart_array(mddev);
6784 err = do_md_stop(mddev, 0, bdev);
6788 err = md_set_readonly(mddev, bdev);
6791 case HOT_REMOVE_DISK:
6792 err = hot_remove_disk(mddev, new_decode_dev(arg));
6796 /* We can support ADD_NEW_DISK on read-only arrays
6797 * on if we are re-adding a preexisting device.
6798 * So require mddev->pers and MD_DISK_SYNC.
6801 mdu_disk_info_t info;
6802 if (copy_from_user(&info, argp, sizeof(info)))
6804 else if (!(info.state & (1<<MD_DISK_SYNC)))
6805 /* Need to clear read-only for this */
6808 err = add_new_disk(mddev, &info);
6814 if (get_user(ro, (int __user *)(arg))) {
6820 /* if the bdev is going readonly the value of mddev->ro
6821 * does not matter, no writes are coming
6826 /* are we are already prepared for writes? */
6830 /* transitioning to readauto need only happen for
6831 * arrays that call md_write_start
6834 err = restart_array(mddev);
6837 set_disk_ro(mddev->gendisk, 0);
6844 * The remaining ioctls are changing the state of the
6845 * superblock, so we do not allow them on read-only arrays.
6847 if (mddev->ro && mddev->pers) {
6848 if (mddev->ro == 2) {
6850 sysfs_notify_dirent_safe(mddev->sysfs_state);
6851 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6852 /* mddev_unlock will wake thread */
6853 /* If a device failed while we were read-only, we
6854 * need to make sure the metadata is updated now.
6856 if (test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
6857 mddev_unlock(mddev);
6858 wait_event(mddev->sb_wait,
6859 !test_bit(MD_CHANGE_DEVS, &mddev->flags) &&
6860 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
6861 mddev_lock_nointr(mddev);
6872 mdu_disk_info_t info;
6873 if (copy_from_user(&info, argp, sizeof(info)))
6876 err = add_new_disk(mddev, &info);
6880 case CLUSTERED_DISK_NACK:
6881 if (mddev_is_clustered(mddev))
6882 md_cluster_ops->new_disk_ack(mddev, false);
6888 err = hot_add_disk(mddev, new_decode_dev(arg));
6892 err = do_md_run(mddev);
6895 case SET_BITMAP_FILE:
6896 err = set_bitmap_file(mddev, (int)arg);
6905 if (mddev->hold_active == UNTIL_IOCTL &&
6907 mddev->hold_active = 0;
6908 mddev_unlock(mddev);
6912 #ifdef CONFIG_COMPAT
6913 static int md_compat_ioctl(struct block_device *bdev, fmode_t mode,
6914 unsigned int cmd, unsigned long arg)
6917 case HOT_REMOVE_DISK:
6919 case SET_DISK_FAULTY:
6920 case SET_BITMAP_FILE:
6921 /* These take in integer arg, do not convert */
6924 arg = (unsigned long)compat_ptr(arg);
6928 return md_ioctl(bdev, mode, cmd, arg);
6930 #endif /* CONFIG_COMPAT */
6932 static int md_open(struct block_device *bdev, fmode_t mode)
6935 * Succeed if we can lock the mddev, which confirms that
6936 * it isn't being stopped right now.
6938 struct mddev *mddev = mddev_find(bdev->bd_dev);
6944 if (mddev->gendisk != bdev->bd_disk) {
6945 /* we are racing with mddev_put which is discarding this
6949 /* Wait until bdev->bd_disk is definitely gone */
6950 flush_workqueue(md_misc_wq);
6951 /* Then retry the open from the top */
6952 return -ERESTARTSYS;
6954 BUG_ON(mddev != bdev->bd_disk->private_data);
6956 if ((err = mutex_lock_interruptible(&mddev->open_mutex)))
6960 atomic_inc(&mddev->openers);
6961 clear_bit(MD_STILL_CLOSED, &mddev->flags);
6962 mutex_unlock(&mddev->open_mutex);
6964 check_disk_change(bdev);
6969 static void md_release(struct gendisk *disk, fmode_t mode)
6971 struct mddev *mddev = disk->private_data;
6974 atomic_dec(&mddev->openers);
6978 static int md_media_changed(struct gendisk *disk)
6980 struct mddev *mddev = disk->private_data;
6982 return mddev->changed;
6985 static int md_revalidate(struct gendisk *disk)
6987 struct mddev *mddev = disk->private_data;
6992 static const struct block_device_operations md_fops =
6994 .owner = THIS_MODULE,
6996 .release = md_release,
6998 #ifdef CONFIG_COMPAT
6999 .compat_ioctl = md_compat_ioctl,
7001 .getgeo = md_getgeo,
7002 .media_changed = md_media_changed,
7003 .revalidate_disk= md_revalidate,
7006 static int md_thread(void *arg)
7008 struct md_thread *thread = arg;
7011 * md_thread is a 'system-thread', it's priority should be very
7012 * high. We avoid resource deadlocks individually in each
7013 * raid personality. (RAID5 does preallocation) We also use RR and
7014 * the very same RT priority as kswapd, thus we will never get
7015 * into a priority inversion deadlock.
7017 * we definitely have to have equal or higher priority than
7018 * bdflush, otherwise bdflush will deadlock if there are too
7019 * many dirty RAID5 blocks.
7022 allow_signal(SIGKILL);
7023 while (!kthread_should_stop()) {
7025 /* We need to wait INTERRUPTIBLE so that
7026 * we don't add to the load-average.
7027 * That means we need to be sure no signals are
7030 if (signal_pending(current))
7031 flush_signals(current);
7033 wait_event_interruptible_timeout
7035 test_bit(THREAD_WAKEUP, &thread->flags)
7036 || kthread_should_stop(),
7039 clear_bit(THREAD_WAKEUP, &thread->flags);
7040 if (!kthread_should_stop())
7041 thread->run(thread);
7047 void md_wakeup_thread(struct md_thread *thread)
7050 pr_debug("md: waking up MD thread %s.\n", thread->tsk->comm);
7051 set_bit(THREAD_WAKEUP, &thread->flags);
7052 wake_up(&thread->wqueue);
7055 EXPORT_SYMBOL(md_wakeup_thread);
7057 struct md_thread *md_register_thread(void (*run) (struct md_thread *),
7058 struct mddev *mddev, const char *name)
7060 struct md_thread *thread;
7062 thread = kzalloc(sizeof(struct md_thread), GFP_KERNEL);
7066 init_waitqueue_head(&thread->wqueue);
7069 thread->mddev = mddev;
7070 thread->timeout = MAX_SCHEDULE_TIMEOUT;
7071 thread->tsk = kthread_run(md_thread, thread,
7073 mdname(thread->mddev),
7075 if (IS_ERR(thread->tsk)) {
7081 EXPORT_SYMBOL(md_register_thread);
7083 void md_unregister_thread(struct md_thread **threadp)
7085 struct md_thread *thread = *threadp;
7088 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
7089 /* Locking ensures that mddev_unlock does not wake_up a
7090 * non-existent thread
7092 spin_lock(&pers_lock);
7094 spin_unlock(&pers_lock);
7096 kthread_stop(thread->tsk);
7099 EXPORT_SYMBOL(md_unregister_thread);
7101 void md_error(struct mddev *mddev, struct md_rdev *rdev)
7103 if (!rdev || test_bit(Faulty, &rdev->flags))
7106 if (!mddev->pers || !mddev->pers->error_handler)
7108 mddev->pers->error_handler(mddev,rdev);
7109 if (mddev->degraded)
7110 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7111 sysfs_notify_dirent_safe(rdev->sysfs_state);
7112 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7113 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7114 md_wakeup_thread(mddev->thread);
7115 if (mddev->event_work.func)
7116 queue_work(md_misc_wq, &mddev->event_work);
7117 md_new_event_inintr(mddev);
7119 EXPORT_SYMBOL(md_error);
7121 /* seq_file implementation /proc/mdstat */
7123 static void status_unused(struct seq_file *seq)
7126 struct md_rdev *rdev;
7128 seq_printf(seq, "unused devices: ");
7130 list_for_each_entry(rdev, &pending_raid_disks, same_set) {
7131 char b[BDEVNAME_SIZE];
7133 seq_printf(seq, "%s ",
7134 bdevname(rdev->bdev,b));
7137 seq_printf(seq, "<none>");
7139 seq_printf(seq, "\n");
7142 static int status_resync(struct seq_file *seq, struct mddev *mddev)
7144 sector_t max_sectors, resync, res;
7145 unsigned long dt, db;
7148 unsigned int per_milli;
7150 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
7151 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
7152 max_sectors = mddev->resync_max_sectors;
7154 max_sectors = mddev->dev_sectors;
7156 resync = mddev->curr_resync;
7158 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
7159 /* Still cleaning up */
7160 resync = max_sectors;
7162 resync -= atomic_read(&mddev->recovery_active);
7165 if (mddev->recovery_cp < MaxSector) {
7166 seq_printf(seq, "\tresync=PENDING");
7172 seq_printf(seq, "\tresync=DELAYED");
7176 WARN_ON(max_sectors == 0);
7177 /* Pick 'scale' such that (resync>>scale)*1000 will fit
7178 * in a sector_t, and (max_sectors>>scale) will fit in a
7179 * u32, as those are the requirements for sector_div.
7180 * Thus 'scale' must be at least 10
7183 if (sizeof(sector_t) > sizeof(unsigned long)) {
7184 while ( max_sectors/2 > (1ULL<<(scale+32)))
7187 res = (resync>>scale)*1000;
7188 sector_div(res, (u32)((max_sectors>>scale)+1));
7192 int i, x = per_milli/50, y = 20-x;
7193 seq_printf(seq, "[");
7194 for (i = 0; i < x; i++)
7195 seq_printf(seq, "=");
7196 seq_printf(seq, ">");
7197 for (i = 0; i < y; i++)
7198 seq_printf(seq, ".");
7199 seq_printf(seq, "] ");
7201 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
7202 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
7204 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
7206 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
7207 "resync" : "recovery"))),
7208 per_milli/10, per_milli % 10,
7209 (unsigned long long) resync/2,
7210 (unsigned long long) max_sectors/2);
7213 * dt: time from mark until now
7214 * db: blocks written from mark until now
7215 * rt: remaining time
7217 * rt is a sector_t, so could be 32bit or 64bit.
7218 * So we divide before multiply in case it is 32bit and close
7220 * We scale the divisor (db) by 32 to avoid losing precision
7221 * near the end of resync when the number of remaining sectors
7223 * We then divide rt by 32 after multiplying by db to compensate.
7224 * The '+1' avoids division by zero if db is very small.
7226 dt = ((jiffies - mddev->resync_mark) / HZ);
7228 db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active))
7229 - mddev->resync_mark_cnt;
7231 rt = max_sectors - resync; /* number of remaining sectors */
7232 sector_div(rt, db/32+1);
7236 seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60,
7237 ((unsigned long)rt % 60)/6);
7239 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
7243 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
7245 struct list_head *tmp;
7247 struct mddev *mddev;
7255 spin_lock(&all_mddevs_lock);
7256 list_for_each(tmp,&all_mddevs)
7258 mddev = list_entry(tmp, struct mddev, all_mddevs);
7260 spin_unlock(&all_mddevs_lock);
7263 spin_unlock(&all_mddevs_lock);
7265 return (void*)2;/* tail */
7269 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
7271 struct list_head *tmp;
7272 struct mddev *next_mddev, *mddev = v;
7278 spin_lock(&all_mddevs_lock);
7280 tmp = all_mddevs.next;
7282 tmp = mddev->all_mddevs.next;
7283 if (tmp != &all_mddevs)
7284 next_mddev = mddev_get(list_entry(tmp,struct mddev,all_mddevs));
7286 next_mddev = (void*)2;
7289 spin_unlock(&all_mddevs_lock);
7297 static void md_seq_stop(struct seq_file *seq, void *v)
7299 struct mddev *mddev = v;
7301 if (mddev && v != (void*)1 && v != (void*)2)
7305 static int md_seq_show(struct seq_file *seq, void *v)
7307 struct mddev *mddev = v;
7309 struct md_rdev *rdev;
7311 if (v == (void*)1) {
7312 struct md_personality *pers;
7313 seq_printf(seq, "Personalities : ");
7314 spin_lock(&pers_lock);
7315 list_for_each_entry(pers, &pers_list, list)
7316 seq_printf(seq, "[%s] ", pers->name);
7318 spin_unlock(&pers_lock);
7319 seq_printf(seq, "\n");
7320 seq->poll_event = atomic_read(&md_event_count);
7323 if (v == (void*)2) {
7328 spin_lock(&mddev->lock);
7329 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
7330 seq_printf(seq, "%s : %sactive", mdname(mddev),
7331 mddev->pers ? "" : "in");
7334 seq_printf(seq, " (read-only)");
7336 seq_printf(seq, " (auto-read-only)");
7337 seq_printf(seq, " %s", mddev->pers->name);
7342 rdev_for_each_rcu(rdev, mddev) {
7343 char b[BDEVNAME_SIZE];
7344 seq_printf(seq, " %s[%d]",
7345 bdevname(rdev->bdev,b), rdev->desc_nr);
7346 if (test_bit(WriteMostly, &rdev->flags))
7347 seq_printf(seq, "(W)");
7348 if (test_bit(Faulty, &rdev->flags)) {
7349 seq_printf(seq, "(F)");
7352 if (test_bit(Journal, &rdev->flags)) {
7353 seq_printf(seq, "(J)");
7356 if (rdev->raid_disk < 0)
7357 seq_printf(seq, "(S)"); /* spare */
7358 if (test_bit(Replacement, &rdev->flags))
7359 seq_printf(seq, "(R)");
7360 sectors += rdev->sectors;
7364 if (!list_empty(&mddev->disks)) {
7366 seq_printf(seq, "\n %llu blocks",
7367 (unsigned long long)
7368 mddev->array_sectors / 2);
7370 seq_printf(seq, "\n %llu blocks",
7371 (unsigned long long)sectors / 2);
7373 if (mddev->persistent) {
7374 if (mddev->major_version != 0 ||
7375 mddev->minor_version != 90) {
7376 seq_printf(seq," super %d.%d",
7377 mddev->major_version,
7378 mddev->minor_version);
7380 } else if (mddev->external)
7381 seq_printf(seq, " super external:%s",
7382 mddev->metadata_type);
7384 seq_printf(seq, " super non-persistent");
7387 mddev->pers->status(seq, mddev);
7388 seq_printf(seq, "\n ");
7389 if (mddev->pers->sync_request) {
7390 if (status_resync(seq, mddev))
7391 seq_printf(seq, "\n ");
7394 seq_printf(seq, "\n ");
7396 bitmap_status(seq, mddev->bitmap);
7398 seq_printf(seq, "\n");
7400 spin_unlock(&mddev->lock);
7405 static const struct seq_operations md_seq_ops = {
7406 .start = md_seq_start,
7407 .next = md_seq_next,
7408 .stop = md_seq_stop,
7409 .show = md_seq_show,
7412 static int md_seq_open(struct inode *inode, struct file *file)
7414 struct seq_file *seq;
7417 error = seq_open(file, &md_seq_ops);
7421 seq = file->private_data;
7422 seq->poll_event = atomic_read(&md_event_count);
7426 static int md_unloading;
7427 static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
7429 struct seq_file *seq = filp->private_data;
7433 return POLLIN|POLLRDNORM|POLLERR|POLLPRI;
7434 poll_wait(filp, &md_event_waiters, wait);
7436 /* always allow read */
7437 mask = POLLIN | POLLRDNORM;
7439 if (seq->poll_event != atomic_read(&md_event_count))
7440 mask |= POLLERR | POLLPRI;
7444 static const struct file_operations md_seq_fops = {
7445 .owner = THIS_MODULE,
7446 .open = md_seq_open,
7448 .llseek = seq_lseek,
7449 .release = seq_release_private,
7450 .poll = mdstat_poll,
7453 int register_md_personality(struct md_personality *p)
7455 printk(KERN_INFO "md: %s personality registered for level %d\n",
7457 spin_lock(&pers_lock);
7458 list_add_tail(&p->list, &pers_list);
7459 spin_unlock(&pers_lock);
7462 EXPORT_SYMBOL(register_md_personality);
7464 int unregister_md_personality(struct md_personality *p)
7466 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
7467 spin_lock(&pers_lock);
7468 list_del_init(&p->list);
7469 spin_unlock(&pers_lock);
7472 EXPORT_SYMBOL(unregister_md_personality);
7474 int register_md_cluster_operations(struct md_cluster_operations *ops,
7475 struct module *module)
7478 spin_lock(&pers_lock);
7479 if (md_cluster_ops != NULL)
7482 md_cluster_ops = ops;
7483 md_cluster_mod = module;
7485 spin_unlock(&pers_lock);
7488 EXPORT_SYMBOL(register_md_cluster_operations);
7490 int unregister_md_cluster_operations(void)
7492 spin_lock(&pers_lock);
7493 md_cluster_ops = NULL;
7494 spin_unlock(&pers_lock);
7497 EXPORT_SYMBOL(unregister_md_cluster_operations);
7499 int md_setup_cluster(struct mddev *mddev, int nodes)
7503 err = request_module("md-cluster");
7505 pr_err("md-cluster module not found.\n");
7509 spin_lock(&pers_lock);
7510 if (!md_cluster_ops || !try_module_get(md_cluster_mod)) {
7511 spin_unlock(&pers_lock);
7514 spin_unlock(&pers_lock);
7516 return md_cluster_ops->join(mddev, nodes);
7519 void md_cluster_stop(struct mddev *mddev)
7521 if (!md_cluster_ops)
7523 md_cluster_ops->leave(mddev);
7524 module_put(md_cluster_mod);
7527 static int is_mddev_idle(struct mddev *mddev, int init)
7529 struct md_rdev *rdev;
7535 rdev_for_each_rcu(rdev, mddev) {
7536 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
7537 curr_events = (int)part_stat_read(&disk->part0, sectors[0]) +
7538 (int)part_stat_read(&disk->part0, sectors[1]) -
7539 atomic_read(&disk->sync_io);
7540 /* sync IO will cause sync_io to increase before the disk_stats
7541 * as sync_io is counted when a request starts, and
7542 * disk_stats is counted when it completes.
7543 * So resync activity will cause curr_events to be smaller than
7544 * when there was no such activity.
7545 * non-sync IO will cause disk_stat to increase without
7546 * increasing sync_io so curr_events will (eventually)
7547 * be larger than it was before. Once it becomes
7548 * substantially larger, the test below will cause
7549 * the array to appear non-idle, and resync will slow
7551 * If there is a lot of outstanding resync activity when
7552 * we set last_event to curr_events, then all that activity
7553 * completing might cause the array to appear non-idle
7554 * and resync will be slowed down even though there might
7555 * not have been non-resync activity. This will only
7556 * happen once though. 'last_events' will soon reflect
7557 * the state where there is little or no outstanding
7558 * resync requests, and further resync activity will
7559 * always make curr_events less than last_events.
7562 if (init || curr_events - rdev->last_events > 64) {
7563 rdev->last_events = curr_events;
7571 void md_done_sync(struct mddev *mddev, int blocks, int ok)
7573 /* another "blocks" (512byte) blocks have been synced */
7574 atomic_sub(blocks, &mddev->recovery_active);
7575 wake_up(&mddev->recovery_wait);
7577 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7578 set_bit(MD_RECOVERY_ERROR, &mddev->recovery);
7579 md_wakeup_thread(mddev->thread);
7580 // stop recovery, signal do_sync ....
7583 EXPORT_SYMBOL(md_done_sync);
7585 /* md_write_start(mddev, bi)
7586 * If we need to update some array metadata (e.g. 'active' flag
7587 * in superblock) before writing, schedule a superblock update
7588 * and wait for it to complete.
7590 void md_write_start(struct mddev *mddev, struct bio *bi)
7593 if (bio_data_dir(bi) != WRITE)
7596 BUG_ON(mddev->ro == 1);
7597 if (mddev->ro == 2) {
7598 /* need to switch to read/write */
7600 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7601 md_wakeup_thread(mddev->thread);
7602 md_wakeup_thread(mddev->sync_thread);
7605 atomic_inc(&mddev->writes_pending);
7606 if (mddev->safemode == 1)
7607 mddev->safemode = 0;
7608 if (mddev->in_sync) {
7609 spin_lock(&mddev->lock);
7610 if (mddev->in_sync) {
7612 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
7613 set_bit(MD_CHANGE_PENDING, &mddev->flags);
7614 md_wakeup_thread(mddev->thread);
7617 spin_unlock(&mddev->lock);
7620 sysfs_notify_dirent_safe(mddev->sysfs_state);
7621 wait_event(mddev->sb_wait,
7622 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
7624 EXPORT_SYMBOL(md_write_start);
7626 void md_write_end(struct mddev *mddev)
7628 if (atomic_dec_and_test(&mddev->writes_pending)) {
7629 if (mddev->safemode == 2)
7630 md_wakeup_thread(mddev->thread);
7631 else if (mddev->safemode_delay)
7632 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
7635 EXPORT_SYMBOL(md_write_end);
7637 /* md_allow_write(mddev)
7638 * Calling this ensures that the array is marked 'active' so that writes
7639 * may proceed without blocking. It is important to call this before
7640 * attempting a GFP_KERNEL allocation while holding the mddev lock.
7641 * Must be called with mddev_lock held.
7643 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
7644 * is dropped, so return -EAGAIN after notifying userspace.
7646 int md_allow_write(struct mddev *mddev)
7652 if (!mddev->pers->sync_request)
7655 spin_lock(&mddev->lock);
7656 if (mddev->in_sync) {
7658 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
7659 set_bit(MD_CHANGE_PENDING, &mddev->flags);
7660 if (mddev->safemode_delay &&
7661 mddev->safemode == 0)
7662 mddev->safemode = 1;
7663 spin_unlock(&mddev->lock);
7664 md_update_sb(mddev, 0);
7665 sysfs_notify_dirent_safe(mddev->sysfs_state);
7667 spin_unlock(&mddev->lock);
7669 if (test_bit(MD_CHANGE_PENDING, &mddev->flags))
7674 EXPORT_SYMBOL_GPL(md_allow_write);
7676 #define SYNC_MARKS 10
7677 #define SYNC_MARK_STEP (3*HZ)
7678 #define UPDATE_FREQUENCY (5*60*HZ)
7679 void md_do_sync(struct md_thread *thread)
7681 struct mddev *mddev = thread->mddev;
7682 struct mddev *mddev2;
7683 unsigned int currspeed = 0,
7685 sector_t max_sectors,j, io_sectors, recovery_done;
7686 unsigned long mark[SYNC_MARKS];
7687 unsigned long update_time;
7688 sector_t mark_cnt[SYNC_MARKS];
7690 struct list_head *tmp;
7691 sector_t last_check;
7693 struct md_rdev *rdev;
7694 char *desc, *action = NULL;
7695 struct blk_plug plug;
7696 bool cluster_resync_finished = false;
7698 /* just incase thread restarts... */
7699 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
7701 if (mddev->ro) {/* never try to sync a read-only array */
7702 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7706 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
7707 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) {
7708 desc = "data-check";
7710 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
7711 desc = "requested-resync";
7715 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
7720 mddev->last_sync_action = action ?: desc;
7722 /* we overload curr_resync somewhat here.
7723 * 0 == not engaged in resync at all
7724 * 2 == checking that there is no conflict with another sync
7725 * 1 == like 2, but have yielded to allow conflicting resync to
7727 * other == active in resync - this many blocks
7729 * Before starting a resync we must have set curr_resync to
7730 * 2, and then checked that every "conflicting" array has curr_resync
7731 * less than ours. When we find one that is the same or higher
7732 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
7733 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
7734 * This will mean we have to start checking from the beginning again.
7739 mddev->curr_resync = 2;
7742 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
7744 for_each_mddev(mddev2, tmp) {
7745 if (mddev2 == mddev)
7747 if (!mddev->parallel_resync
7748 && mddev2->curr_resync
7749 && match_mddev_units(mddev, mddev2)) {
7751 if (mddev < mddev2 && mddev->curr_resync == 2) {
7752 /* arbitrarily yield */
7753 mddev->curr_resync = 1;
7754 wake_up(&resync_wait);
7756 if (mddev > mddev2 && mddev->curr_resync == 1)
7757 /* no need to wait here, we can wait the next
7758 * time 'round when curr_resync == 2
7761 /* We need to wait 'interruptible' so as not to
7762 * contribute to the load average, and not to
7763 * be caught by 'softlockup'
7765 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
7766 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
7767 mddev2->curr_resync >= mddev->curr_resync) {
7768 printk(KERN_INFO "md: delaying %s of %s"
7769 " until %s has finished (they"
7770 " share one or more physical units)\n",
7771 desc, mdname(mddev), mdname(mddev2));
7773 if (signal_pending(current))
7774 flush_signals(current);
7776 finish_wait(&resync_wait, &wq);
7779 finish_wait(&resync_wait, &wq);
7782 } while (mddev->curr_resync < 2);
7785 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
7786 /* resync follows the size requested by the personality,
7787 * which defaults to physical size, but can be virtual size
7789 max_sectors = mddev->resync_max_sectors;
7790 atomic64_set(&mddev->resync_mismatches, 0);
7791 /* we don't use the checkpoint if there's a bitmap */
7792 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
7793 j = mddev->resync_min;
7794 else if (!mddev->bitmap)
7795 j = mddev->recovery_cp;
7797 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
7798 max_sectors = mddev->resync_max_sectors;
7800 /* recovery follows the physical size of devices */
7801 max_sectors = mddev->dev_sectors;
7804 rdev_for_each_rcu(rdev, mddev)
7805 if (rdev->raid_disk >= 0 &&
7806 !test_bit(Faulty, &rdev->flags) &&
7807 !test_bit(In_sync, &rdev->flags) &&
7808 rdev->recovery_offset < j)
7809 j = rdev->recovery_offset;
7812 /* If there is a bitmap, we need to make sure all
7813 * writes that started before we added a spare
7814 * complete before we start doing a recovery.
7815 * Otherwise the write might complete and (via
7816 * bitmap_endwrite) set a bit in the bitmap after the
7817 * recovery has checked that bit and skipped that
7820 if (mddev->bitmap) {
7821 mddev->pers->quiesce(mddev, 1);
7822 mddev->pers->quiesce(mddev, 0);
7826 printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev));
7827 printk(KERN_INFO "md: minimum _guaranteed_ speed:"
7828 " %d KB/sec/disk.\n", speed_min(mddev));
7829 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
7830 "(but not more than %d KB/sec) for %s.\n",
7831 speed_max(mddev), desc);
7833 is_mddev_idle(mddev, 1); /* this initializes IO event counters */
7836 for (m = 0; m < SYNC_MARKS; m++) {
7838 mark_cnt[m] = io_sectors;
7841 mddev->resync_mark = mark[last_mark];
7842 mddev->resync_mark_cnt = mark_cnt[last_mark];
7845 * Tune reconstruction:
7847 window = 32*(PAGE_SIZE/512);
7848 printk(KERN_INFO "md: using %dk window, over a total of %lluk.\n",
7849 window/2, (unsigned long long)max_sectors/2);
7851 atomic_set(&mddev->recovery_active, 0);
7856 "md: resuming %s of %s from checkpoint.\n",
7857 desc, mdname(mddev));
7858 mddev->curr_resync = j;
7860 mddev->curr_resync = 3; /* no longer delayed */
7861 mddev->curr_resync_completed = j;
7862 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
7863 md_new_event(mddev);
7864 update_time = jiffies;
7866 blk_start_plug(&plug);
7867 while (j < max_sectors) {
7872 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
7873 ((mddev->curr_resync > mddev->curr_resync_completed &&
7874 (mddev->curr_resync - mddev->curr_resync_completed)
7875 > (max_sectors >> 4)) ||
7876 time_after_eq(jiffies, update_time + UPDATE_FREQUENCY) ||
7877 (j - mddev->curr_resync_completed)*2
7878 >= mddev->resync_max - mddev->curr_resync_completed ||
7879 mddev->curr_resync_completed > mddev->resync_max
7881 /* time to update curr_resync_completed */
7882 wait_event(mddev->recovery_wait,
7883 atomic_read(&mddev->recovery_active) == 0);
7884 mddev->curr_resync_completed = j;
7885 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) &&
7886 j > mddev->recovery_cp)
7887 mddev->recovery_cp = j;
7888 update_time = jiffies;
7889 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
7890 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
7893 while (j >= mddev->resync_max &&
7894 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
7895 /* As this condition is controlled by user-space,
7896 * we can block indefinitely, so use '_interruptible'
7897 * to avoid triggering warnings.
7899 flush_signals(current); /* just in case */
7900 wait_event_interruptible(mddev->recovery_wait,
7901 mddev->resync_max > j
7902 || test_bit(MD_RECOVERY_INTR,
7906 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
7909 sectors = mddev->pers->sync_request(mddev, j, &skipped);
7911 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7915 if (!skipped) { /* actual IO requested */
7916 io_sectors += sectors;
7917 atomic_add(sectors, &mddev->recovery_active);
7920 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
7924 if (j > max_sectors)
7925 /* when skipping, extra large numbers can be returned. */
7928 mddev->curr_resync = j;
7929 mddev->curr_mark_cnt = io_sectors;
7930 if (last_check == 0)
7931 /* this is the earliest that rebuild will be
7932 * visible in /proc/mdstat
7934 md_new_event(mddev);
7936 if (last_check + window > io_sectors || j == max_sectors)
7939 last_check = io_sectors;
7941 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
7943 int next = (last_mark+1) % SYNC_MARKS;
7945 mddev->resync_mark = mark[next];
7946 mddev->resync_mark_cnt = mark_cnt[next];
7947 mark[next] = jiffies;
7948 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
7952 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
7956 * this loop exits only if either when we are slower than
7957 * the 'hard' speed limit, or the system was IO-idle for
7959 * the system might be non-idle CPU-wise, but we only care
7960 * about not overloading the IO subsystem. (things like an
7961 * e2fsck being done on the RAID array should execute fast)
7965 recovery_done = io_sectors - atomic_read(&mddev->recovery_active);
7966 currspeed = ((unsigned long)(recovery_done - mddev->resync_mark_cnt))/2
7967 /((jiffies-mddev->resync_mark)/HZ +1) +1;
7969 if (currspeed > speed_min(mddev)) {
7970 if (currspeed > speed_max(mddev)) {
7974 if (!is_mddev_idle(mddev, 0)) {
7976 * Give other IO more of a chance.
7977 * The faster the devices, the less we wait.
7979 wait_event(mddev->recovery_wait,
7980 !atomic_read(&mddev->recovery_active));
7984 printk(KERN_INFO "md: %s: %s %s.\n",mdname(mddev), desc,
7985 test_bit(MD_RECOVERY_INTR, &mddev->recovery)
7986 ? "interrupted" : "done");
7988 * this also signals 'finished resyncing' to md_stop
7990 blk_finish_plug(&plug);
7991 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
7993 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
7994 !test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
7995 mddev->curr_resync > 2) {
7996 mddev->curr_resync_completed = mddev->curr_resync;
7997 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
7999 /* tell personality and other nodes that we are finished */
8000 if (mddev_is_clustered(mddev)) {
8001 md_cluster_ops->resync_finish(mddev);
8002 cluster_resync_finished = true;
8004 mddev->pers->sync_request(mddev, max_sectors, &skipped);
8006 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
8007 mddev->curr_resync > 2) {
8008 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
8009 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
8010 if (mddev->curr_resync >= mddev->recovery_cp) {
8012 "md: checkpointing %s of %s.\n",
8013 desc, mdname(mddev));
8014 if (test_bit(MD_RECOVERY_ERROR,
8016 mddev->recovery_cp =
8017 mddev->curr_resync_completed;
8019 mddev->recovery_cp =
8023 mddev->recovery_cp = MaxSector;
8025 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8026 mddev->curr_resync = MaxSector;
8028 rdev_for_each_rcu(rdev, mddev)
8029 if (rdev->raid_disk >= 0 &&
8030 mddev->delta_disks >= 0 &&
8031 !test_bit(Faulty, &rdev->flags) &&
8032 !test_bit(In_sync, &rdev->flags) &&
8033 rdev->recovery_offset < mddev->curr_resync)
8034 rdev->recovery_offset = mddev->curr_resync;
8039 set_bit(MD_CHANGE_DEVS, &mddev->flags);
8041 if (mddev_is_clustered(mddev) &&
8042 test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8043 !cluster_resync_finished)
8044 md_cluster_ops->resync_finish(mddev);
8046 spin_lock(&mddev->lock);
8047 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
8048 /* We completed so min/max setting can be forgotten if used. */
8049 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
8050 mddev->resync_min = 0;
8051 mddev->resync_max = MaxSector;
8052 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
8053 mddev->resync_min = mddev->curr_resync_completed;
8054 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
8055 mddev->curr_resync = 0;
8056 spin_unlock(&mddev->lock);
8058 wake_up(&resync_wait);
8059 md_wakeup_thread(mddev->thread);
8062 EXPORT_SYMBOL_GPL(md_do_sync);
8064 static int remove_and_add_spares(struct mddev *mddev,
8065 struct md_rdev *this)
8067 struct md_rdev *rdev;
8071 rdev_for_each(rdev, mddev)
8072 if ((this == NULL || rdev == this) &&
8073 rdev->raid_disk >= 0 &&
8074 !test_bit(Blocked, &rdev->flags) &&
8075 (test_bit(Faulty, &rdev->flags) ||
8076 ! test_bit(In_sync, &rdev->flags)) &&
8077 atomic_read(&rdev->nr_pending)==0) {
8078 if (mddev->pers->hot_remove_disk(
8079 mddev, rdev) == 0) {
8080 sysfs_unlink_rdev(mddev, rdev);
8081 rdev->raid_disk = -1;
8085 if (removed && mddev->kobj.sd)
8086 sysfs_notify(&mddev->kobj, NULL, "degraded");
8088 if (this && removed)
8091 rdev_for_each(rdev, mddev) {
8092 if (this && this != rdev)
8094 if (test_bit(Candidate, &rdev->flags))
8096 if (rdev->raid_disk >= 0 &&
8097 !test_bit(In_sync, &rdev->flags) &&
8098 !test_bit(Faulty, &rdev->flags))
8100 if (rdev->raid_disk >= 0)
8102 if (test_bit(Faulty, &rdev->flags))
8104 if (test_bit(Journal, &rdev->flags))
8107 ! (rdev->saved_raid_disk >= 0 &&
8108 !test_bit(Bitmap_sync, &rdev->flags)))
8111 if (rdev->saved_raid_disk < 0)
8112 rdev->recovery_offset = 0;
8114 hot_add_disk(mddev, rdev) == 0) {
8115 if (sysfs_link_rdev(mddev, rdev))
8116 /* failure here is OK */;
8118 md_new_event(mddev);
8119 set_bit(MD_CHANGE_DEVS, &mddev->flags);
8124 set_bit(MD_CHANGE_DEVS, &mddev->flags);
8128 static void md_start_sync(struct work_struct *ws)
8130 struct mddev *mddev = container_of(ws, struct mddev, del_work);
8133 if (mddev_is_clustered(mddev)) {
8134 ret = md_cluster_ops->resync_start(mddev);
8136 mddev->sync_thread = NULL;
8141 mddev->sync_thread = md_register_thread(md_do_sync,
8145 if (!mddev->sync_thread) {
8146 if (!(mddev_is_clustered(mddev) && ret == -EAGAIN))
8147 printk(KERN_ERR "%s: could not start resync"
8150 /* leave the spares where they are, it shouldn't hurt */
8151 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8152 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
8153 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
8154 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
8155 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
8156 wake_up(&resync_wait);
8157 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
8159 if (mddev->sysfs_action)
8160 sysfs_notify_dirent_safe(mddev->sysfs_action);
8162 md_wakeup_thread(mddev->sync_thread);
8163 sysfs_notify_dirent_safe(mddev->sysfs_action);
8164 md_new_event(mddev);
8168 * This routine is regularly called by all per-raid-array threads to
8169 * deal with generic issues like resync and super-block update.
8170 * Raid personalities that don't have a thread (linear/raid0) do not
8171 * need this as they never do any recovery or update the superblock.
8173 * It does not do any resync itself, but rather "forks" off other threads
8174 * to do that as needed.
8175 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
8176 * "->recovery" and create a thread at ->sync_thread.
8177 * When the thread finishes it sets MD_RECOVERY_DONE
8178 * and wakeups up this thread which will reap the thread and finish up.
8179 * This thread also removes any faulty devices (with nr_pending == 0).
8181 * The overall approach is:
8182 * 1/ if the superblock needs updating, update it.
8183 * 2/ If a recovery thread is running, don't do anything else.
8184 * 3/ If recovery has finished, clean up, possibly marking spares active.
8185 * 4/ If there are any faulty devices, remove them.
8186 * 5/ If array is degraded, try to add spares devices
8187 * 6/ If array has spares or is not in-sync, start a resync thread.
8189 void md_check_recovery(struct mddev *mddev)
8191 if (mddev->suspended)
8195 bitmap_daemon_work(mddev);
8197 if (signal_pending(current)) {
8198 if (mddev->pers->sync_request && !mddev->external) {
8199 printk(KERN_INFO "md: %s in immediate safe mode\n",
8201 mddev->safemode = 2;
8203 flush_signals(current);
8206 if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
8209 (mddev->flags & MD_UPDATE_SB_FLAGS & ~ (1<<MD_CHANGE_PENDING)) ||
8210 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
8211 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
8212 (mddev->external == 0 && mddev->safemode == 1) ||
8213 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
8214 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
8218 if (mddev_trylock(mddev)) {
8222 struct md_rdev *rdev;
8223 if (!mddev->external && mddev->in_sync)
8224 /* 'Blocked' flag not needed as failed devices
8225 * will be recorded if array switched to read/write.
8226 * Leaving it set will prevent the device
8227 * from being removed.
8229 rdev_for_each(rdev, mddev)
8230 clear_bit(Blocked, &rdev->flags);
8231 /* On a read-only array we can:
8232 * - remove failed devices
8233 * - add already-in_sync devices if the array itself
8235 * As we only add devices that are already in-sync,
8236 * we can activate the spares immediately.
8238 remove_and_add_spares(mddev, NULL);
8239 /* There is no thread, but we need to call
8240 * ->spare_active and clear saved_raid_disk
8242 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8243 md_reap_sync_thread(mddev);
8244 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8245 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8246 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
8250 if (!mddev->external) {
8252 spin_lock(&mddev->lock);
8253 if (mddev->safemode &&
8254 !atomic_read(&mddev->writes_pending) &&
8256 mddev->recovery_cp == MaxSector) {
8259 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
8261 if (mddev->safemode == 1)
8262 mddev->safemode = 0;
8263 spin_unlock(&mddev->lock);
8265 sysfs_notify_dirent_safe(mddev->sysfs_state);
8268 if (mddev->flags & MD_UPDATE_SB_FLAGS)
8269 md_update_sb(mddev, 0);
8271 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
8272 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
8273 /* resync/recovery still happening */
8274 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8277 if (mddev->sync_thread) {
8278 md_reap_sync_thread(mddev);
8281 /* Set RUNNING before clearing NEEDED to avoid
8282 * any transients in the value of "sync_action".
8284 mddev->curr_resync_completed = 0;
8285 spin_lock(&mddev->lock);
8286 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
8287 spin_unlock(&mddev->lock);
8288 /* Clear some bits that don't mean anything, but
8291 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
8292 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
8294 if (!test_and_clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
8295 test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
8297 /* no recovery is running.
8298 * remove any failed drives, then
8299 * add spares if possible.
8300 * Spares are also removed and re-added, to allow
8301 * the personality to fail the re-add.
8304 if (mddev->reshape_position != MaxSector) {
8305 if (mddev->pers->check_reshape == NULL ||
8306 mddev->pers->check_reshape(mddev) != 0)
8307 /* Cannot proceed */
8309 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
8310 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8311 } else if ((spares = remove_and_add_spares(mddev, NULL))) {
8312 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8313 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
8314 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
8315 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8316 } else if (mddev->recovery_cp < MaxSector) {
8317 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8318 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8319 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
8320 /* nothing to be done ... */
8323 if (mddev->pers->sync_request) {
8325 /* We are adding a device or devices to an array
8326 * which has the bitmap stored on all devices.
8327 * So make sure all bitmap pages get written
8329 bitmap_write_all(mddev->bitmap);
8331 INIT_WORK(&mddev->del_work, md_start_sync);
8332 queue_work(md_misc_wq, &mddev->del_work);
8336 if (!mddev->sync_thread) {
8337 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
8338 wake_up(&resync_wait);
8339 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
8341 if (mddev->sysfs_action)
8342 sysfs_notify_dirent_safe(mddev->sysfs_action);
8345 wake_up(&mddev->sb_wait);
8346 mddev_unlock(mddev);
8349 EXPORT_SYMBOL(md_check_recovery);
8351 void md_reap_sync_thread(struct mddev *mddev)
8353 struct md_rdev *rdev;
8355 /* resync has finished, collect result */
8356 md_unregister_thread(&mddev->sync_thread);
8357 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8358 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
8360 /* activate any spares */
8361 if (mddev->pers->spare_active(mddev)) {
8362 sysfs_notify(&mddev->kobj, NULL,
8364 set_bit(MD_CHANGE_DEVS, &mddev->flags);
8367 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8368 mddev->pers->finish_reshape)
8369 mddev->pers->finish_reshape(mddev);
8371 /* If array is no-longer degraded, then any saved_raid_disk
8372 * information must be scrapped.
8374 if (!mddev->degraded)
8375 rdev_for_each(rdev, mddev)
8376 rdev->saved_raid_disk = -1;
8378 md_update_sb(mddev, 1);
8379 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
8380 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
8381 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8382 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
8383 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
8384 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
8385 wake_up(&resync_wait);
8386 /* flag recovery needed just to double check */
8387 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8388 sysfs_notify_dirent_safe(mddev->sysfs_action);
8389 md_new_event(mddev);
8390 if (mddev->event_work.func)
8391 queue_work(md_misc_wq, &mddev->event_work);
8393 EXPORT_SYMBOL(md_reap_sync_thread);
8395 void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev)
8397 sysfs_notify_dirent_safe(rdev->sysfs_state);
8398 wait_event_timeout(rdev->blocked_wait,
8399 !test_bit(Blocked, &rdev->flags) &&
8400 !test_bit(BlockedBadBlocks, &rdev->flags),
8401 msecs_to_jiffies(5000));
8402 rdev_dec_pending(rdev, mddev);
8404 EXPORT_SYMBOL(md_wait_for_blocked_rdev);
8406 void md_finish_reshape(struct mddev *mddev)
8408 /* called be personality module when reshape completes. */
8409 struct md_rdev *rdev;
8411 rdev_for_each(rdev, mddev) {
8412 if (rdev->data_offset > rdev->new_data_offset)
8413 rdev->sectors += rdev->data_offset - rdev->new_data_offset;
8415 rdev->sectors -= rdev->new_data_offset - rdev->data_offset;
8416 rdev->data_offset = rdev->new_data_offset;
8419 EXPORT_SYMBOL(md_finish_reshape);
8421 /* Bad block management.
8422 * We can record which blocks on each device are 'bad' and so just
8423 * fail those blocks, or that stripe, rather than the whole device.
8424 * Entries in the bad-block table are 64bits wide. This comprises:
8425 * Length of bad-range, in sectors: 0-511 for lengths 1-512
8426 * Start of bad-range, sector offset, 54 bits (allows 8 exbibytes)
8427 * A 'shift' can be set so that larger blocks are tracked and
8428 * consequently larger devices can be covered.
8429 * 'Acknowledged' flag - 1 bit. - the most significant bit.
8431 * Locking of the bad-block table uses a seqlock so md_is_badblock
8432 * might need to retry if it is very unlucky.
8433 * We will sometimes want to check for bad blocks in a bi_end_io function,
8434 * so we use the write_seqlock_irq variant.
8436 * When looking for a bad block we specify a range and want to
8437 * know if any block in the range is bad. So we binary-search
8438 * to the last range that starts at-or-before the given endpoint,
8439 * (or "before the sector after the target range")
8440 * then see if it ends after the given start.
8442 * 0 if there are no known bad blocks in the range
8443 * 1 if there are known bad block which are all acknowledged
8444 * -1 if there are bad blocks which have not yet been acknowledged in metadata.
8445 * plus the start/length of the first bad section we overlap.
8447 int md_is_badblock(struct badblocks *bb, sector_t s, int sectors,
8448 sector_t *first_bad, int *bad_sectors)
8454 sector_t target = s + sectors;
8457 if (bb->shift > 0) {
8458 /* round the start down, and the end up */
8460 target += (1<<bb->shift) - 1;
8461 target >>= bb->shift;
8462 sectors = target - s;
8464 /* 'target' is now the first block after the bad range */
8467 seq = read_seqbegin(&bb->lock);
8472 /* Binary search between lo and hi for 'target'
8473 * i.e. for the last range that starts before 'target'
8475 /* INVARIANT: ranges before 'lo' and at-or-after 'hi'
8476 * are known not to be the last range before target.
8477 * VARIANT: hi-lo is the number of possible
8478 * ranges, and decreases until it reaches 1
8480 while (hi - lo > 1) {
8481 int mid = (lo + hi) / 2;
8482 sector_t a = BB_OFFSET(p[mid]);
8484 /* This could still be the one, earlier ranges
8488 /* This and later ranges are definitely out. */
8491 /* 'lo' might be the last that started before target, but 'hi' isn't */
8493 /* need to check all range that end after 's' to see if
8494 * any are unacknowledged.
8497 BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) {
8498 if (BB_OFFSET(p[lo]) < target) {
8499 /* starts before the end, and finishes after
8500 * the start, so they must overlap
8502 if (rv != -1 && BB_ACK(p[lo]))
8506 *first_bad = BB_OFFSET(p[lo]);
8507 *bad_sectors = BB_LEN(p[lo]);
8513 if (read_seqretry(&bb->lock, seq))
8518 EXPORT_SYMBOL_GPL(md_is_badblock);
8521 * Add a range of bad blocks to the table.
8522 * This might extend the table, or might contract it
8523 * if two adjacent ranges can be merged.
8524 * We binary-search to find the 'insertion' point, then
8525 * decide how best to handle it.
8527 static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors,
8533 unsigned long flags;
8536 /* badblocks are disabled */
8540 /* round the start down, and the end up */
8541 sector_t next = s + sectors;
8543 next += (1<<bb->shift) - 1;
8548 write_seqlock_irqsave(&bb->lock, flags);
8553 /* Find the last range that starts at-or-before 's' */
8554 while (hi - lo > 1) {
8555 int mid = (lo + hi) / 2;
8556 sector_t a = BB_OFFSET(p[mid]);
8562 if (hi > lo && BB_OFFSET(p[lo]) > s)
8566 /* we found a range that might merge with the start
8569 sector_t a = BB_OFFSET(p[lo]);
8570 sector_t e = a + BB_LEN(p[lo]);
8571 int ack = BB_ACK(p[lo]);
8573 /* Yes, we can merge with a previous range */
8574 if (s == a && s + sectors >= e)
8575 /* new range covers old */
8578 ack = ack && acknowledged;
8580 if (e < s + sectors)
8582 if (e - a <= BB_MAX_LEN) {
8583 p[lo] = BB_MAKE(a, e-a, ack);
8586 /* does not all fit in one range,
8587 * make p[lo] maximal
8589 if (BB_LEN(p[lo]) != BB_MAX_LEN)
8590 p[lo] = BB_MAKE(a, BB_MAX_LEN, ack);
8596 if (sectors && hi < bb->count) {
8597 /* 'hi' points to the first range that starts after 's'.
8598 * Maybe we can merge with the start of that range */
8599 sector_t a = BB_OFFSET(p[hi]);
8600 sector_t e = a + BB_LEN(p[hi]);
8601 int ack = BB_ACK(p[hi]);
8602 if (a <= s + sectors) {
8603 /* merging is possible */
8604 if (e <= s + sectors) {
8609 ack = ack && acknowledged;
8612 if (e - a <= BB_MAX_LEN) {
8613 p[hi] = BB_MAKE(a, e-a, ack);
8616 p[hi] = BB_MAKE(a, BB_MAX_LEN, ack);
8624 if (sectors == 0 && hi < bb->count) {
8625 /* we might be able to combine lo and hi */
8626 /* Note: 's' is at the end of 'lo' */
8627 sector_t a = BB_OFFSET(p[hi]);
8628 int lolen = BB_LEN(p[lo]);
8629 int hilen = BB_LEN(p[hi]);
8630 int newlen = lolen + hilen - (s - a);
8631 if (s >= a && newlen < BB_MAX_LEN) {
8632 /* yes, we can combine them */
8633 int ack = BB_ACK(p[lo]) && BB_ACK(p[hi]);
8634 p[lo] = BB_MAKE(BB_OFFSET(p[lo]), newlen, ack);
8635 memmove(p + hi, p + hi + 1,
8636 (bb->count - hi - 1) * 8);
8641 /* didn't merge (it all).
8642 * Need to add a range just before 'hi' */
8643 if (bb->count >= MD_MAX_BADBLOCKS) {
8644 /* No room for more */
8648 int this_sectors = sectors;
8649 memmove(p + hi + 1, p + hi,
8650 (bb->count - hi) * 8);
8653 if (this_sectors > BB_MAX_LEN)
8654 this_sectors = BB_MAX_LEN;
8655 p[hi] = BB_MAKE(s, this_sectors, acknowledged);
8656 sectors -= this_sectors;
8663 bb->unacked_exist = 1;
8664 write_sequnlock_irqrestore(&bb->lock, flags);
8669 int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
8674 s += rdev->new_data_offset;
8676 s += rdev->data_offset;
8677 rv = md_set_badblocks(&rdev->badblocks,
8680 /* Make sure they get written out promptly */
8681 sysfs_notify_dirent_safe(rdev->sysfs_state);
8682 set_bit(MD_CHANGE_CLEAN, &rdev->mddev->flags);
8683 set_bit(MD_CHANGE_PENDING, &rdev->mddev->flags);
8684 md_wakeup_thread(rdev->mddev->thread);
8688 EXPORT_SYMBOL_GPL(rdev_set_badblocks);
8691 * Remove a range of bad blocks from the table.
8692 * This may involve extending the table if we spilt a region,
8693 * but it must not fail. So if the table becomes full, we just
8694 * drop the remove request.
8696 static int md_clear_badblocks(struct badblocks *bb, sector_t s, int sectors)
8700 sector_t target = s + sectors;
8703 if (bb->shift > 0) {
8704 /* When clearing we round the start up and the end down.
8705 * This should not matter as the shift should align with
8706 * the block size and no rounding should ever be needed.
8707 * However it is better the think a block is bad when it
8708 * isn't than to think a block is not bad when it is.
8710 s += (1<<bb->shift) - 1;
8712 target >>= bb->shift;
8713 sectors = target - s;
8716 write_seqlock_irq(&bb->lock);
8721 /* Find the last range that starts before 'target' */
8722 while (hi - lo > 1) {
8723 int mid = (lo + hi) / 2;
8724 sector_t a = BB_OFFSET(p[mid]);
8731 /* p[lo] is the last range that could overlap the
8732 * current range. Earlier ranges could also overlap,
8733 * but only this one can overlap the end of the range.
8735 if (BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > target) {
8736 /* Partial overlap, leave the tail of this range */
8737 int ack = BB_ACK(p[lo]);
8738 sector_t a = BB_OFFSET(p[lo]);
8739 sector_t end = a + BB_LEN(p[lo]);
8742 /* we need to split this range */
8743 if (bb->count >= MD_MAX_BADBLOCKS) {
8747 memmove(p+lo+1, p+lo, (bb->count - lo) * 8);
8749 p[lo] = BB_MAKE(a, s-a, ack);
8752 p[lo] = BB_MAKE(target, end - target, ack);
8753 /* there is no longer an overlap */
8758 BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) {
8759 /* This range does overlap */
8760 if (BB_OFFSET(p[lo]) < s) {
8761 /* Keep the early parts of this range. */
8762 int ack = BB_ACK(p[lo]);
8763 sector_t start = BB_OFFSET(p[lo]);
8764 p[lo] = BB_MAKE(start, s - start, ack);
8765 /* now low doesn't overlap, so.. */
8770 /* 'lo' is strictly before, 'hi' is strictly after,
8771 * anything between needs to be discarded
8774 memmove(p+lo+1, p+hi, (bb->count - hi) * 8);
8775 bb->count -= (hi - lo - 1);
8781 write_sequnlock_irq(&bb->lock);
8785 int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
8789 s += rdev->new_data_offset;
8791 s += rdev->data_offset;
8792 return md_clear_badblocks(&rdev->badblocks,
8795 EXPORT_SYMBOL_GPL(rdev_clear_badblocks);
8798 * Acknowledge all bad blocks in a list.
8799 * This only succeeds if ->changed is clear. It is used by
8800 * in-kernel metadata updates
8802 void md_ack_all_badblocks(struct badblocks *bb)
8804 if (bb->page == NULL || bb->changed)
8805 /* no point even trying */
8807 write_seqlock_irq(&bb->lock);
8809 if (bb->changed == 0 && bb->unacked_exist) {
8812 for (i = 0; i < bb->count ; i++) {
8813 if (!BB_ACK(p[i])) {
8814 sector_t start = BB_OFFSET(p[i]);
8815 int len = BB_LEN(p[i]);
8816 p[i] = BB_MAKE(start, len, 1);
8819 bb->unacked_exist = 0;
8821 write_sequnlock_irq(&bb->lock);
8823 EXPORT_SYMBOL_GPL(md_ack_all_badblocks);
8825 /* sysfs access to bad-blocks list.
8826 * We present two files.
8827 * 'bad-blocks' lists sector numbers and lengths of ranges that
8828 * are recorded as bad. The list is truncated to fit within
8829 * the one-page limit of sysfs.
8830 * Writing "sector length" to this file adds an acknowledged
8832 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
8833 * been acknowledged. Writing to this file adds bad blocks
8834 * without acknowledging them. This is largely for testing.
8838 badblocks_show(struct badblocks *bb, char *page, int unack)
8849 seq = read_seqbegin(&bb->lock);
8854 while (len < PAGE_SIZE && i < bb->count) {
8855 sector_t s = BB_OFFSET(p[i]);
8856 unsigned int length = BB_LEN(p[i]);
8857 int ack = BB_ACK(p[i]);
8863 len += snprintf(page+len, PAGE_SIZE-len, "%llu %u\n",
8864 (unsigned long long)s << bb->shift,
8865 length << bb->shift);
8867 if (unack && len == 0)
8868 bb->unacked_exist = 0;
8870 if (read_seqretry(&bb->lock, seq))
8879 badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack)
8881 unsigned long long sector;
8885 /* Allow clearing via sysfs *only* for testing/debugging.
8886 * Normally only a successful write may clear a badblock
8889 if (page[0] == '-') {
8893 #endif /* DO_DEBUG */
8895 switch (sscanf(page, "%llu %d%c", §or, &length, &newline)) {
8897 if (newline != '\n')
8909 md_clear_badblocks(bb, sector, length);
8912 #endif /* DO_DEBUG */
8913 if (md_set_badblocks(bb, sector, length, !unack))
8919 static int md_notify_reboot(struct notifier_block *this,
8920 unsigned long code, void *x)
8922 struct list_head *tmp;
8923 struct mddev *mddev;
8926 for_each_mddev(mddev, tmp) {
8927 if (mddev_trylock(mddev)) {
8929 __md_stop_writes(mddev);
8930 if (mddev->persistent)
8931 mddev->safemode = 2;
8932 mddev_unlock(mddev);
8937 * certain more exotic SCSI devices are known to be
8938 * volatile wrt too early system reboots. While the
8939 * right place to handle this issue is the given
8940 * driver, we do want to have a safe RAID driver ...
8948 static struct notifier_block md_notifier = {
8949 .notifier_call = md_notify_reboot,
8951 .priority = INT_MAX, /* before any real devices */
8954 static void md_geninit(void)
8956 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
8958 proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops);
8961 static int __init md_init(void)
8965 md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0);
8969 md_misc_wq = alloc_workqueue("md_misc", 0, 0);
8973 if ((ret = register_blkdev(MD_MAJOR, "md")) < 0)
8976 if ((ret = register_blkdev(0, "mdp")) < 0)
8980 blk_register_region(MKDEV(MD_MAJOR, 0), 512, THIS_MODULE,
8981 md_probe, NULL, NULL);
8982 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
8983 md_probe, NULL, NULL);
8985 register_reboot_notifier(&md_notifier);
8986 raid_table_header = register_sysctl_table(raid_root_table);
8992 unregister_blkdev(MD_MAJOR, "md");
8994 destroy_workqueue(md_misc_wq);
8996 destroy_workqueue(md_wq);
9001 static void check_sb_changes(struct mddev *mddev, struct md_rdev *rdev)
9003 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
9004 struct md_rdev *rdev2;
9006 char b[BDEVNAME_SIZE];
9008 /* Check for change of roles in the active devices */
9009 rdev_for_each(rdev2, mddev) {
9010 if (test_bit(Faulty, &rdev2->flags))
9013 /* Check if the roles changed */
9014 role = le16_to_cpu(sb->dev_roles[rdev2->desc_nr]);
9016 if (test_bit(Candidate, &rdev2->flags)) {
9017 if (role == 0xfffe) {
9018 pr_info("md: Removing Candidate device %s because add failed\n", bdevname(rdev2->bdev,b));
9019 md_kick_rdev_from_array(rdev2);
9023 clear_bit(Candidate, &rdev2->flags);
9026 if (role != rdev2->raid_disk) {
9028 if (rdev2->raid_disk == -1 && role != 0xffff) {
9029 rdev2->saved_raid_disk = role;
9030 ret = remove_and_add_spares(mddev, rdev2);
9031 pr_info("Activated spare: %s\n",
9032 bdevname(rdev2->bdev,b));
9036 * We just want to do the minimum to mark the disk
9037 * as faulty. The recovery is performed by the
9038 * one who initiated the error.
9040 if ((role == 0xfffe) || (role == 0xfffd)) {
9041 md_error(mddev, rdev2);
9042 clear_bit(Blocked, &rdev2->flags);
9047 if (mddev->raid_disks != le32_to_cpu(sb->raid_disks))
9048 update_raid_disks(mddev, le32_to_cpu(sb->raid_disks));
9050 /* Finally set the event to be up to date */
9051 mddev->events = le64_to_cpu(sb->events);
9054 static int read_rdev(struct mddev *mddev, struct md_rdev *rdev)
9057 struct page *swapout = rdev->sb_page;
9058 struct mdp_superblock_1 *sb;
9060 /* Store the sb page of the rdev in the swapout temporary
9061 * variable in case we err in the future
9063 rdev->sb_page = NULL;
9064 alloc_disk_sb(rdev);
9065 ClearPageUptodate(rdev->sb_page);
9066 rdev->sb_loaded = 0;
9067 err = super_types[mddev->major_version].load_super(rdev, NULL, mddev->minor_version);
9070 pr_warn("%s: %d Could not reload rdev(%d) err: %d. Restoring old values\n",
9071 __func__, __LINE__, rdev->desc_nr, err);
9072 put_page(rdev->sb_page);
9073 rdev->sb_page = swapout;
9074 rdev->sb_loaded = 1;
9078 sb = page_address(rdev->sb_page);
9079 /* Read the offset unconditionally, even if MD_FEATURE_RECOVERY_OFFSET
9083 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RECOVERY_OFFSET))
9084 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
9086 /* The other node finished recovery, call spare_active to set
9087 * device In_sync and mddev->degraded
9089 if (rdev->recovery_offset == MaxSector &&
9090 !test_bit(In_sync, &rdev->flags) &&
9091 mddev->pers->spare_active(mddev))
9092 sysfs_notify(&mddev->kobj, NULL, "degraded");
9098 void md_reload_sb(struct mddev *mddev, int nr)
9100 struct md_rdev *rdev;
9104 rdev_for_each_rcu(rdev, mddev) {
9105 if (rdev->desc_nr == nr)
9109 if (!rdev || rdev->desc_nr != nr) {
9110 pr_warn("%s: %d Could not find rdev with nr %d\n", __func__, __LINE__, nr);
9114 err = read_rdev(mddev, rdev);
9118 check_sb_changes(mddev, rdev);
9120 /* Read all rdev's to update recovery_offset */
9121 rdev_for_each_rcu(rdev, mddev)
9122 read_rdev(mddev, rdev);
9124 EXPORT_SYMBOL(md_reload_sb);
9129 * Searches all registered partitions for autorun RAID arrays
9133 static LIST_HEAD(all_detected_devices);
9134 struct detected_devices_node {
9135 struct list_head list;
9139 void md_autodetect_dev(dev_t dev)
9141 struct detected_devices_node *node_detected_dev;
9143 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
9144 if (node_detected_dev) {
9145 node_detected_dev->dev = dev;
9146 list_add_tail(&node_detected_dev->list, &all_detected_devices);
9148 printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed"
9149 ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev));
9153 static void autostart_arrays(int part)
9155 struct md_rdev *rdev;
9156 struct detected_devices_node *node_detected_dev;
9158 int i_scanned, i_passed;
9163 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
9165 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
9167 node_detected_dev = list_entry(all_detected_devices.next,
9168 struct detected_devices_node, list);
9169 list_del(&node_detected_dev->list);
9170 dev = node_detected_dev->dev;
9171 kfree(node_detected_dev);
9172 rdev = md_import_device(dev,0, 90);
9176 if (test_bit(Faulty, &rdev->flags))
9179 set_bit(AutoDetected, &rdev->flags);
9180 list_add(&rdev->same_set, &pending_raid_disks);
9184 printk(KERN_INFO "md: Scanned %d and added %d devices.\n",
9185 i_scanned, i_passed);
9187 autorun_devices(part);
9190 #endif /* !MODULE */
9192 static __exit void md_exit(void)
9194 struct mddev *mddev;
9195 struct list_head *tmp;
9198 blk_unregister_region(MKDEV(MD_MAJOR,0), 512);
9199 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
9201 unregister_blkdev(MD_MAJOR,"md");
9202 unregister_blkdev(mdp_major, "mdp");
9203 unregister_reboot_notifier(&md_notifier);
9204 unregister_sysctl_table(raid_table_header);
9206 /* We cannot unload the modules while some process is
9207 * waiting for us in select() or poll() - wake them up
9210 while (waitqueue_active(&md_event_waiters)) {
9211 /* not safe to leave yet */
9212 wake_up(&md_event_waiters);
9216 remove_proc_entry("mdstat", NULL);
9218 for_each_mddev(mddev, tmp) {
9219 export_array(mddev);
9220 mddev->hold_active = 0;
9222 destroy_workqueue(md_misc_wq);
9223 destroy_workqueue(md_wq);
9226 subsys_initcall(md_init);
9227 module_exit(md_exit)
9229 static int get_ro(char *buffer, struct kernel_param *kp)
9231 return sprintf(buffer, "%d", start_readonly);
9233 static int set_ro(const char *val, struct kernel_param *kp)
9235 return kstrtouint(val, 10, (unsigned int *)&start_readonly);
9238 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
9239 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
9240 module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR);
9242 MODULE_LICENSE("GPL");
9243 MODULE_DESCRIPTION("MD RAID framework");
9245 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);