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);
1650 if (mddev->recovery_cp == MaxSector)
1651 set_bit(MD_JOURNAL_CLEAN, &mddev->flags);
1654 rdev->saved_raid_disk = role;
1655 if ((le32_to_cpu(sb->feature_map) &
1656 MD_FEATURE_RECOVERY_OFFSET)) {
1657 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1658 if (!(le32_to_cpu(sb->feature_map) &
1659 MD_FEATURE_RECOVERY_BITMAP))
1660 rdev->saved_raid_disk = -1;
1662 set_bit(In_sync, &rdev->flags);
1663 rdev->raid_disk = role;
1666 if (sb->devflags & WriteMostly1)
1667 set_bit(WriteMostly, &rdev->flags);
1668 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_REPLACEMENT)
1669 set_bit(Replacement, &rdev->flags);
1670 } else /* MULTIPATH are always insync */
1671 set_bit(In_sync, &rdev->flags);
1676 static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev)
1678 struct mdp_superblock_1 *sb;
1679 struct md_rdev *rdev2;
1681 /* make rdev->sb match mddev and rdev data. */
1683 sb = page_address(rdev->sb_page);
1685 sb->feature_map = 0;
1687 sb->recovery_offset = cpu_to_le64(0);
1688 memset(sb->pad3, 0, sizeof(sb->pad3));
1690 sb->utime = cpu_to_le64((__u64)mddev->utime);
1691 sb->events = cpu_to_le64(mddev->events);
1693 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1694 else if (test_bit(MD_JOURNAL_CLEAN, &mddev->flags))
1695 sb->resync_offset = cpu_to_le64(MaxSector);
1697 sb->resync_offset = cpu_to_le64(0);
1699 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
1701 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
1702 sb->size = cpu_to_le64(mddev->dev_sectors);
1703 sb->chunksize = cpu_to_le32(mddev->chunk_sectors);
1704 sb->level = cpu_to_le32(mddev->level);
1705 sb->layout = cpu_to_le32(mddev->layout);
1707 if (test_bit(WriteMostly, &rdev->flags))
1708 sb->devflags |= WriteMostly1;
1710 sb->devflags &= ~WriteMostly1;
1711 sb->data_offset = cpu_to_le64(rdev->data_offset);
1712 sb->data_size = cpu_to_le64(rdev->sectors);
1714 if (mddev->bitmap && mddev->bitmap_info.file == NULL) {
1715 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset);
1716 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
1719 if (rdev->raid_disk >= 0 &&
1720 !test_bit(In_sync, &rdev->flags)) {
1722 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1723 sb->recovery_offset =
1724 cpu_to_le64(rdev->recovery_offset);
1725 if (rdev->saved_raid_disk >= 0 && mddev->bitmap)
1727 cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP);
1729 /* Note: recovery_offset and journal_tail share space */
1730 if (test_bit(Journal, &rdev->flags))
1731 sb->journal_tail = cpu_to_le64(rdev->journal_tail);
1732 if (test_bit(Replacement, &rdev->flags))
1734 cpu_to_le32(MD_FEATURE_REPLACEMENT);
1736 if (mddev->reshape_position != MaxSector) {
1737 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1738 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1739 sb->new_layout = cpu_to_le32(mddev->new_layout);
1740 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1741 sb->new_level = cpu_to_le32(mddev->new_level);
1742 sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors);
1743 if (mddev->delta_disks == 0 &&
1744 mddev->reshape_backwards)
1746 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS);
1747 if (rdev->new_data_offset != rdev->data_offset) {
1749 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET);
1750 sb->new_offset = cpu_to_le32((__u32)(rdev->new_data_offset
1751 - rdev->data_offset));
1755 if (mddev_is_clustered(mddev))
1756 sb->feature_map |= cpu_to_le32(MD_FEATURE_CLUSTERED);
1758 if (rdev->badblocks.count == 0)
1759 /* Nothing to do for bad blocks*/ ;
1760 else if (sb->bblog_offset == 0)
1761 /* Cannot record bad blocks on this device */
1762 md_error(mddev, rdev);
1764 struct badblocks *bb = &rdev->badblocks;
1765 u64 *bbp = (u64 *)page_address(rdev->bb_page);
1767 sb->feature_map |= cpu_to_le32(MD_FEATURE_BAD_BLOCKS);
1772 seq = read_seqbegin(&bb->lock);
1774 memset(bbp, 0xff, PAGE_SIZE);
1776 for (i = 0 ; i < bb->count ; i++) {
1777 u64 internal_bb = p[i];
1778 u64 store_bb = ((BB_OFFSET(internal_bb) << 10)
1779 | BB_LEN(internal_bb));
1780 bbp[i] = cpu_to_le64(store_bb);
1783 if (read_seqretry(&bb->lock, seq))
1786 bb->sector = (rdev->sb_start +
1787 (int)le32_to_cpu(sb->bblog_offset));
1788 bb->size = le16_to_cpu(sb->bblog_size);
1793 rdev_for_each(rdev2, mddev)
1794 if (rdev2->desc_nr+1 > max_dev)
1795 max_dev = rdev2->desc_nr+1;
1797 if (max_dev > le32_to_cpu(sb->max_dev)) {
1799 sb->max_dev = cpu_to_le32(max_dev);
1800 rdev->sb_size = max_dev * 2 + 256;
1801 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1802 if (rdev->sb_size & bmask)
1803 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1805 max_dev = le32_to_cpu(sb->max_dev);
1807 for (i=0; i<max_dev;i++)
1808 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_FAULTY);
1810 rdev_for_each(rdev2, mddev) {
1812 if (test_bit(Faulty, &rdev2->flags))
1813 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_FAULTY);
1814 else if (test_bit(In_sync, &rdev2->flags))
1815 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1816 else if (test_bit(Journal, &rdev2->flags)) {
1817 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_JOURNAL);
1818 sb->feature_map |= cpu_to_le32(MD_FEATURE_JOURNAL);
1819 } else if (rdev2->raid_disk >= 0)
1820 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1822 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_SPARE);
1825 sb->sb_csum = calc_sb_1_csum(sb);
1828 static unsigned long long
1829 super_1_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
1831 struct mdp_superblock_1 *sb;
1832 sector_t max_sectors;
1833 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1834 return 0; /* component must fit device */
1835 if (rdev->data_offset != rdev->new_data_offset)
1836 return 0; /* too confusing */
1837 if (rdev->sb_start < rdev->data_offset) {
1838 /* minor versions 1 and 2; superblock before data */
1839 max_sectors = i_size_read(rdev->bdev->bd_inode) >> 9;
1840 max_sectors -= rdev->data_offset;
1841 if (!num_sectors || num_sectors > max_sectors)
1842 num_sectors = max_sectors;
1843 } else if (rdev->mddev->bitmap_info.offset) {
1844 /* minor version 0 with bitmap we can't move */
1847 /* minor version 0; superblock after data */
1849 sb_start = (i_size_read(rdev->bdev->bd_inode) >> 9) - 8*2;
1850 sb_start &= ~(sector_t)(4*2 - 1);
1851 max_sectors = rdev->sectors + sb_start - rdev->sb_start;
1852 if (!num_sectors || num_sectors > max_sectors)
1853 num_sectors = max_sectors;
1854 rdev->sb_start = sb_start;
1856 sb = page_address(rdev->sb_page);
1857 sb->data_size = cpu_to_le64(num_sectors);
1858 sb->super_offset = rdev->sb_start;
1859 sb->sb_csum = calc_sb_1_csum(sb);
1860 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1862 md_super_wait(rdev->mddev);
1868 super_1_allow_new_offset(struct md_rdev *rdev,
1869 unsigned long long new_offset)
1871 /* All necessary checks on new >= old have been done */
1872 struct bitmap *bitmap;
1873 if (new_offset >= rdev->data_offset)
1876 /* with 1.0 metadata, there is no metadata to tread on
1877 * so we can always move back */
1878 if (rdev->mddev->minor_version == 0)
1881 /* otherwise we must be sure not to step on
1882 * any metadata, so stay:
1883 * 36K beyond start of superblock
1884 * beyond end of badblocks
1885 * beyond write-intent bitmap
1887 if (rdev->sb_start + (32+4)*2 > new_offset)
1889 bitmap = rdev->mddev->bitmap;
1890 if (bitmap && !rdev->mddev->bitmap_info.file &&
1891 rdev->sb_start + rdev->mddev->bitmap_info.offset +
1892 bitmap->storage.file_pages * (PAGE_SIZE>>9) > new_offset)
1894 if (rdev->badblocks.sector + rdev->badblocks.size > new_offset)
1900 static struct super_type super_types[] = {
1903 .owner = THIS_MODULE,
1904 .load_super = super_90_load,
1905 .validate_super = super_90_validate,
1906 .sync_super = super_90_sync,
1907 .rdev_size_change = super_90_rdev_size_change,
1908 .allow_new_offset = super_90_allow_new_offset,
1912 .owner = THIS_MODULE,
1913 .load_super = super_1_load,
1914 .validate_super = super_1_validate,
1915 .sync_super = super_1_sync,
1916 .rdev_size_change = super_1_rdev_size_change,
1917 .allow_new_offset = super_1_allow_new_offset,
1921 static void sync_super(struct mddev *mddev, struct md_rdev *rdev)
1923 if (mddev->sync_super) {
1924 mddev->sync_super(mddev, rdev);
1928 BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types));
1930 super_types[mddev->major_version].sync_super(mddev, rdev);
1933 static int match_mddev_units(struct mddev *mddev1, struct mddev *mddev2)
1935 struct md_rdev *rdev, *rdev2;
1938 rdev_for_each_rcu(rdev, mddev1) {
1939 if (test_bit(Faulty, &rdev->flags) ||
1940 test_bit(Journal, &rdev->flags) ||
1941 rdev->raid_disk == -1)
1943 rdev_for_each_rcu(rdev2, mddev2) {
1944 if (test_bit(Faulty, &rdev2->flags) ||
1945 test_bit(Journal, &rdev2->flags) ||
1946 rdev2->raid_disk == -1)
1948 if (rdev->bdev->bd_contains ==
1949 rdev2->bdev->bd_contains) {
1959 static LIST_HEAD(pending_raid_disks);
1962 * Try to register data integrity profile for an mddev
1964 * This is called when an array is started and after a disk has been kicked
1965 * from the array. It only succeeds if all working and active component devices
1966 * are integrity capable with matching profiles.
1968 int md_integrity_register(struct mddev *mddev)
1970 struct md_rdev *rdev, *reference = NULL;
1972 if (list_empty(&mddev->disks))
1973 return 0; /* nothing to do */
1974 if (!mddev->gendisk || blk_get_integrity(mddev->gendisk))
1975 return 0; /* shouldn't register, or already is */
1976 rdev_for_each(rdev, mddev) {
1977 /* skip spares and non-functional disks */
1978 if (test_bit(Faulty, &rdev->flags))
1980 if (rdev->raid_disk < 0)
1983 /* Use the first rdev as the reference */
1987 /* does this rdev's profile match the reference profile? */
1988 if (blk_integrity_compare(reference->bdev->bd_disk,
1989 rdev->bdev->bd_disk) < 0)
1992 if (!reference || !bdev_get_integrity(reference->bdev))
1995 * All component devices are integrity capable and have matching
1996 * profiles, register the common profile for the md device.
1998 if (blk_integrity_register(mddev->gendisk,
1999 bdev_get_integrity(reference->bdev)) != 0) {
2000 printk(KERN_ERR "md: failed to register integrity for %s\n",
2004 printk(KERN_NOTICE "md: data integrity enabled on %s\n", mdname(mddev));
2005 if (bioset_integrity_create(mddev->bio_set, BIO_POOL_SIZE)) {
2006 printk(KERN_ERR "md: failed to create integrity pool for %s\n",
2012 EXPORT_SYMBOL(md_integrity_register);
2014 /* Disable data integrity if non-capable/non-matching disk is being added */
2015 void md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev)
2017 struct blk_integrity *bi_rdev;
2018 struct blk_integrity *bi_mddev;
2020 if (!mddev->gendisk)
2023 bi_rdev = bdev_get_integrity(rdev->bdev);
2024 bi_mddev = blk_get_integrity(mddev->gendisk);
2026 if (!bi_mddev) /* nothing to do */
2028 if (rdev->raid_disk < 0) /* skip spares */
2030 if (bi_rdev && blk_integrity_compare(mddev->gendisk,
2031 rdev->bdev->bd_disk) >= 0)
2033 printk(KERN_NOTICE "disabling data integrity on %s\n", mdname(mddev));
2034 blk_integrity_unregister(mddev->gendisk);
2036 EXPORT_SYMBOL(md_integrity_add_rdev);
2038 static int bind_rdev_to_array(struct md_rdev *rdev, struct mddev *mddev)
2040 char b[BDEVNAME_SIZE];
2044 /* prevent duplicates */
2045 if (find_rdev(mddev, rdev->bdev->bd_dev))
2048 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2049 if (rdev->sectors && (mddev->dev_sectors == 0 ||
2050 rdev->sectors < mddev->dev_sectors)) {
2052 /* Cannot change size, so fail
2053 * If mddev->level <= 0, then we don't care
2054 * about aligning sizes (e.g. linear)
2056 if (mddev->level > 0)
2059 mddev->dev_sectors = rdev->sectors;
2062 /* Verify rdev->desc_nr is unique.
2063 * If it is -1, assign a free number, else
2064 * check number is not in use
2067 if (rdev->desc_nr < 0) {
2070 choice = mddev->raid_disks;
2071 while (md_find_rdev_nr_rcu(mddev, choice))
2073 rdev->desc_nr = choice;
2075 if (md_find_rdev_nr_rcu(mddev, rdev->desc_nr)) {
2081 if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) {
2082 printk(KERN_WARNING "md: %s: array is limited to %d devices\n",
2083 mdname(mddev), mddev->max_disks);
2086 bdevname(rdev->bdev,b);
2087 strreplace(b, '/', '!');
2089 rdev->mddev = mddev;
2090 printk(KERN_INFO "md: bind<%s>\n", b);
2092 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
2095 ko = &part_to_dev(rdev->bdev->bd_part)->kobj;
2096 if (sysfs_create_link(&rdev->kobj, ko, "block"))
2097 /* failure here is OK */;
2098 rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state");
2100 list_add_rcu(&rdev->same_set, &mddev->disks);
2101 bd_link_disk_holder(rdev->bdev, mddev->gendisk);
2103 /* May as well allow recovery to be retried once */
2104 mddev->recovery_disabled++;
2109 printk(KERN_WARNING "md: failed to register dev-%s for %s\n",
2114 static void md_delayed_delete(struct work_struct *ws)
2116 struct md_rdev *rdev = container_of(ws, struct md_rdev, del_work);
2117 kobject_del(&rdev->kobj);
2118 kobject_put(&rdev->kobj);
2121 static void unbind_rdev_from_array(struct md_rdev *rdev)
2123 char b[BDEVNAME_SIZE];
2125 bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk);
2126 list_del_rcu(&rdev->same_set);
2127 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
2129 sysfs_remove_link(&rdev->kobj, "block");
2130 sysfs_put(rdev->sysfs_state);
2131 rdev->sysfs_state = NULL;
2132 rdev->badblocks.count = 0;
2133 /* We need to delay this, otherwise we can deadlock when
2134 * writing to 'remove' to "dev/state". We also need
2135 * to delay it due to rcu usage.
2138 INIT_WORK(&rdev->del_work, md_delayed_delete);
2139 kobject_get(&rdev->kobj);
2140 queue_work(md_misc_wq, &rdev->del_work);
2144 * prevent the device from being mounted, repartitioned or
2145 * otherwise reused by a RAID array (or any other kernel
2146 * subsystem), by bd_claiming the device.
2148 static int lock_rdev(struct md_rdev *rdev, dev_t dev, int shared)
2151 struct block_device *bdev;
2152 char b[BDEVNAME_SIZE];
2154 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
2155 shared ? (struct md_rdev *)lock_rdev : rdev);
2157 printk(KERN_ERR "md: could not open %s.\n",
2158 __bdevname(dev, b));
2159 return PTR_ERR(bdev);
2165 static void unlock_rdev(struct md_rdev *rdev)
2167 struct block_device *bdev = rdev->bdev;
2169 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
2172 void md_autodetect_dev(dev_t dev);
2174 static void export_rdev(struct md_rdev *rdev)
2176 char b[BDEVNAME_SIZE];
2178 printk(KERN_INFO "md: export_rdev(%s)\n",
2179 bdevname(rdev->bdev,b));
2180 md_rdev_clear(rdev);
2182 if (test_bit(AutoDetected, &rdev->flags))
2183 md_autodetect_dev(rdev->bdev->bd_dev);
2186 kobject_put(&rdev->kobj);
2189 void md_kick_rdev_from_array(struct md_rdev *rdev)
2191 unbind_rdev_from_array(rdev);
2194 EXPORT_SYMBOL_GPL(md_kick_rdev_from_array);
2196 static void export_array(struct mddev *mddev)
2198 struct md_rdev *rdev;
2200 while (!list_empty(&mddev->disks)) {
2201 rdev = list_first_entry(&mddev->disks, struct md_rdev,
2203 md_kick_rdev_from_array(rdev);
2205 mddev->raid_disks = 0;
2206 mddev->major_version = 0;
2209 static void sync_sbs(struct mddev *mddev, int nospares)
2211 /* Update each superblock (in-memory image), but
2212 * if we are allowed to, skip spares which already
2213 * have the right event counter, or have one earlier
2214 * (which would mean they aren't being marked as dirty
2215 * with the rest of the array)
2217 struct md_rdev *rdev;
2218 rdev_for_each(rdev, mddev) {
2219 if (rdev->sb_events == mddev->events ||
2221 rdev->raid_disk < 0 &&
2222 rdev->sb_events+1 == mddev->events)) {
2223 /* Don't update this superblock */
2224 rdev->sb_loaded = 2;
2226 sync_super(mddev, rdev);
2227 rdev->sb_loaded = 1;
2232 static bool does_sb_need_changing(struct mddev *mddev)
2234 struct md_rdev *rdev;
2235 struct mdp_superblock_1 *sb;
2238 /* Find a good rdev */
2239 rdev_for_each(rdev, mddev)
2240 if ((rdev->raid_disk >= 0) && !test_bit(Faulty, &rdev->flags))
2243 /* No good device found. */
2247 sb = page_address(rdev->sb_page);
2248 /* Check if a device has become faulty or a spare become active */
2249 rdev_for_each(rdev, mddev) {
2250 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
2251 /* Device activated? */
2252 if (role == 0xffff && rdev->raid_disk >=0 &&
2253 !test_bit(Faulty, &rdev->flags))
2255 /* Device turned faulty? */
2256 if (test_bit(Faulty, &rdev->flags) && (role < 0xfffd))
2260 /* Check if any mddev parameters have changed */
2261 if ((mddev->dev_sectors != le64_to_cpu(sb->size)) ||
2262 (mddev->reshape_position != le64_to_cpu(sb->reshape_position)) ||
2263 (mddev->layout != le64_to_cpu(sb->layout)) ||
2264 (mddev->raid_disks != le32_to_cpu(sb->raid_disks)) ||
2265 (mddev->chunk_sectors != le32_to_cpu(sb->chunksize)))
2271 void md_update_sb(struct mddev *mddev, int force_change)
2273 struct md_rdev *rdev;
2276 int any_badblocks_changed = 0;
2281 set_bit(MD_CHANGE_DEVS, &mddev->flags);
2285 if (mddev_is_clustered(mddev)) {
2286 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
2288 ret = md_cluster_ops->metadata_update_start(mddev);
2289 /* Has someone else has updated the sb */
2290 if (!does_sb_need_changing(mddev)) {
2292 md_cluster_ops->metadata_update_cancel(mddev);
2293 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2298 /* First make sure individual recovery_offsets are correct */
2299 rdev_for_each(rdev, mddev) {
2300 if (rdev->raid_disk >= 0 &&
2301 mddev->delta_disks >= 0 &&
2302 !test_bit(In_sync, &rdev->flags) &&
2303 mddev->curr_resync_completed > rdev->recovery_offset)
2304 rdev->recovery_offset = mddev->curr_resync_completed;
2307 if (!mddev->persistent) {
2308 clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
2309 clear_bit(MD_CHANGE_DEVS, &mddev->flags);
2310 if (!mddev->external) {
2311 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2312 rdev_for_each(rdev, mddev) {
2313 if (rdev->badblocks.changed) {
2314 rdev->badblocks.changed = 0;
2315 md_ack_all_badblocks(&rdev->badblocks);
2316 md_error(mddev, rdev);
2318 clear_bit(Blocked, &rdev->flags);
2319 clear_bit(BlockedBadBlocks, &rdev->flags);
2320 wake_up(&rdev->blocked_wait);
2323 wake_up(&mddev->sb_wait);
2327 spin_lock(&mddev->lock);
2329 mddev->utime = get_seconds();
2331 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
2333 if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags))
2334 /* just a clean<-> dirty transition, possibly leave spares alone,
2335 * though if events isn't the right even/odd, we will have to do
2341 if (mddev->degraded)
2342 /* If the array is degraded, then skipping spares is both
2343 * dangerous and fairly pointless.
2344 * Dangerous because a device that was removed from the array
2345 * might have a event_count that still looks up-to-date,
2346 * so it can be re-added without a resync.
2347 * Pointless because if there are any spares to skip,
2348 * then a recovery will happen and soon that array won't
2349 * be degraded any more and the spare can go back to sleep then.
2353 sync_req = mddev->in_sync;
2355 /* If this is just a dirty<->clean transition, and the array is clean
2356 * and 'events' is odd, we can roll back to the previous clean state */
2358 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
2359 && mddev->can_decrease_events
2360 && mddev->events != 1) {
2362 mddev->can_decrease_events = 0;
2364 /* otherwise we have to go forward and ... */
2366 mddev->can_decrease_events = nospares;
2370 * This 64-bit counter should never wrap.
2371 * Either we are in around ~1 trillion A.C., assuming
2372 * 1 reboot per second, or we have a bug...
2374 WARN_ON(mddev->events == 0);
2376 rdev_for_each(rdev, mddev) {
2377 if (rdev->badblocks.changed)
2378 any_badblocks_changed++;
2379 if (test_bit(Faulty, &rdev->flags))
2380 set_bit(FaultRecorded, &rdev->flags);
2383 sync_sbs(mddev, nospares);
2384 spin_unlock(&mddev->lock);
2386 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2387 mdname(mddev), mddev->in_sync);
2389 bitmap_update_sb(mddev->bitmap);
2390 rdev_for_each(rdev, mddev) {
2391 char b[BDEVNAME_SIZE];
2393 if (rdev->sb_loaded != 1)
2394 continue; /* no noise on spare devices */
2396 if (!test_bit(Faulty, &rdev->flags)) {
2397 md_super_write(mddev,rdev,
2398 rdev->sb_start, rdev->sb_size,
2400 pr_debug("md: (write) %s's sb offset: %llu\n",
2401 bdevname(rdev->bdev, b),
2402 (unsigned long long)rdev->sb_start);
2403 rdev->sb_events = mddev->events;
2404 if (rdev->badblocks.size) {
2405 md_super_write(mddev, rdev,
2406 rdev->badblocks.sector,
2407 rdev->badblocks.size << 9,
2409 rdev->badblocks.size = 0;
2413 pr_debug("md: %s (skipping faulty)\n",
2414 bdevname(rdev->bdev, b));
2416 if (mddev->level == LEVEL_MULTIPATH)
2417 /* only need to write one superblock... */
2420 md_super_wait(mddev);
2421 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2423 spin_lock(&mddev->lock);
2424 if (mddev->in_sync != sync_req ||
2425 test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
2426 /* have to write it out again */
2427 spin_unlock(&mddev->lock);
2430 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2431 spin_unlock(&mddev->lock);
2432 wake_up(&mddev->sb_wait);
2433 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
2434 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
2436 rdev_for_each(rdev, mddev) {
2437 if (test_and_clear_bit(FaultRecorded, &rdev->flags))
2438 clear_bit(Blocked, &rdev->flags);
2440 if (any_badblocks_changed)
2441 md_ack_all_badblocks(&rdev->badblocks);
2442 clear_bit(BlockedBadBlocks, &rdev->flags);
2443 wake_up(&rdev->blocked_wait);
2446 if (mddev_is_clustered(mddev) && ret == 0)
2447 md_cluster_ops->metadata_update_finish(mddev);
2449 EXPORT_SYMBOL(md_update_sb);
2451 static int add_bound_rdev(struct md_rdev *rdev)
2453 struct mddev *mddev = rdev->mddev;
2456 if (!mddev->pers->hot_remove_disk) {
2457 /* If there is hot_add_disk but no hot_remove_disk
2458 * then added disks for geometry changes,
2459 * and should be added immediately.
2461 super_types[mddev->major_version].
2462 validate_super(mddev, rdev);
2463 err = mddev->pers->hot_add_disk(mddev, rdev);
2465 unbind_rdev_from_array(rdev);
2470 sysfs_notify_dirent_safe(rdev->sysfs_state);
2472 set_bit(MD_CHANGE_DEVS, &mddev->flags);
2473 if (mddev->degraded)
2474 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
2475 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2476 md_new_event(mddev);
2477 md_wakeup_thread(mddev->thread);
2481 /* words written to sysfs files may, or may not, be \n terminated.
2482 * We want to accept with case. For this we use cmd_match.
2484 static int cmd_match(const char *cmd, const char *str)
2486 /* See if cmd, written into a sysfs file, matches
2487 * str. They must either be the same, or cmd can
2488 * have a trailing newline
2490 while (*cmd && *str && *cmd == *str) {
2501 struct rdev_sysfs_entry {
2502 struct attribute attr;
2503 ssize_t (*show)(struct md_rdev *, char *);
2504 ssize_t (*store)(struct md_rdev *, const char *, size_t);
2508 state_show(struct md_rdev *rdev, char *page)
2512 unsigned long flags = ACCESS_ONCE(rdev->flags);
2514 if (test_bit(Faulty, &flags) ||
2515 rdev->badblocks.unacked_exist) {
2516 len+= sprintf(page+len, "%sfaulty",sep);
2519 if (test_bit(In_sync, &flags)) {
2520 len += sprintf(page+len, "%sin_sync",sep);
2523 if (test_bit(Journal, &flags)) {
2524 len += sprintf(page+len, "%sjournal",sep);
2527 if (test_bit(WriteMostly, &flags)) {
2528 len += sprintf(page+len, "%swrite_mostly",sep);
2531 if (test_bit(Blocked, &flags) ||
2532 (rdev->badblocks.unacked_exist
2533 && !test_bit(Faulty, &flags))) {
2534 len += sprintf(page+len, "%sblocked", sep);
2537 if (!test_bit(Faulty, &flags) &&
2538 !test_bit(In_sync, &flags)) {
2539 len += sprintf(page+len, "%sspare", sep);
2542 if (test_bit(WriteErrorSeen, &flags)) {
2543 len += sprintf(page+len, "%swrite_error", sep);
2546 if (test_bit(WantReplacement, &flags)) {
2547 len += sprintf(page+len, "%swant_replacement", sep);
2550 if (test_bit(Replacement, &flags)) {
2551 len += sprintf(page+len, "%sreplacement", sep);
2555 return len+sprintf(page+len, "\n");
2559 state_store(struct md_rdev *rdev, const char *buf, size_t len)
2562 * faulty - simulates an error
2563 * remove - disconnects the device
2564 * writemostly - sets write_mostly
2565 * -writemostly - clears write_mostly
2566 * blocked - sets the Blocked flags
2567 * -blocked - clears the Blocked and possibly simulates an error
2568 * insync - sets Insync providing device isn't active
2569 * -insync - clear Insync for a device with a slot assigned,
2570 * so that it gets rebuilt based on bitmap
2571 * write_error - sets WriteErrorSeen
2572 * -write_error - clears WriteErrorSeen
2575 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
2576 md_error(rdev->mddev, rdev);
2577 if (test_bit(Faulty, &rdev->flags))
2581 } else if (cmd_match(buf, "remove")) {
2582 if (rdev->raid_disk >= 0)
2585 struct mddev *mddev = rdev->mddev;
2587 if (mddev_is_clustered(mddev))
2588 err = md_cluster_ops->remove_disk(mddev, rdev);
2591 md_kick_rdev_from_array(rdev);
2593 md_update_sb(mddev, 1);
2594 md_new_event(mddev);
2597 } else if (cmd_match(buf, "writemostly")) {
2598 set_bit(WriteMostly, &rdev->flags);
2600 } else if (cmd_match(buf, "-writemostly")) {
2601 clear_bit(WriteMostly, &rdev->flags);
2603 } else if (cmd_match(buf, "blocked")) {
2604 set_bit(Blocked, &rdev->flags);
2606 } else if (cmd_match(buf, "-blocked")) {
2607 if (!test_bit(Faulty, &rdev->flags) &&
2608 rdev->badblocks.unacked_exist) {
2609 /* metadata handler doesn't understand badblocks,
2610 * so we need to fail the device
2612 md_error(rdev->mddev, rdev);
2614 clear_bit(Blocked, &rdev->flags);
2615 clear_bit(BlockedBadBlocks, &rdev->flags);
2616 wake_up(&rdev->blocked_wait);
2617 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2618 md_wakeup_thread(rdev->mddev->thread);
2621 } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) {
2622 set_bit(In_sync, &rdev->flags);
2624 } else if (cmd_match(buf, "-insync") && rdev->raid_disk >= 0) {
2625 if (rdev->mddev->pers == NULL) {
2626 clear_bit(In_sync, &rdev->flags);
2627 rdev->saved_raid_disk = rdev->raid_disk;
2628 rdev->raid_disk = -1;
2631 } else if (cmd_match(buf, "write_error")) {
2632 set_bit(WriteErrorSeen, &rdev->flags);
2634 } else if (cmd_match(buf, "-write_error")) {
2635 clear_bit(WriteErrorSeen, &rdev->flags);
2637 } else if (cmd_match(buf, "want_replacement")) {
2638 /* Any non-spare device that is not a replacement can
2639 * become want_replacement at any time, but we then need to
2640 * check if recovery is needed.
2642 if (rdev->raid_disk >= 0 &&
2643 !test_bit(Replacement, &rdev->flags))
2644 set_bit(WantReplacement, &rdev->flags);
2645 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2646 md_wakeup_thread(rdev->mddev->thread);
2648 } else if (cmd_match(buf, "-want_replacement")) {
2649 /* Clearing 'want_replacement' is always allowed.
2650 * Once replacements starts it is too late though.
2653 clear_bit(WantReplacement, &rdev->flags);
2654 } else if (cmd_match(buf, "replacement")) {
2655 /* Can only set a device as a replacement when array has not
2656 * yet been started. Once running, replacement is automatic
2657 * from spares, or by assigning 'slot'.
2659 if (rdev->mddev->pers)
2662 set_bit(Replacement, &rdev->flags);
2665 } else if (cmd_match(buf, "-replacement")) {
2666 /* Similarly, can only clear Replacement before start */
2667 if (rdev->mddev->pers)
2670 clear_bit(Replacement, &rdev->flags);
2673 } else if (cmd_match(buf, "re-add")) {
2674 if (test_bit(Faulty, &rdev->flags) && (rdev->raid_disk == -1)) {
2675 /* clear_bit is performed _after_ all the devices
2676 * have their local Faulty bit cleared. If any writes
2677 * happen in the meantime in the local node, they
2678 * will land in the local bitmap, which will be synced
2679 * by this node eventually
2681 if (!mddev_is_clustered(rdev->mddev) ||
2682 (err = md_cluster_ops->gather_bitmaps(rdev)) == 0) {
2683 clear_bit(Faulty, &rdev->flags);
2684 err = add_bound_rdev(rdev);
2690 sysfs_notify_dirent_safe(rdev->sysfs_state);
2691 return err ? err : len;
2693 static struct rdev_sysfs_entry rdev_state =
2694 __ATTR_PREALLOC(state, S_IRUGO|S_IWUSR, state_show, state_store);
2697 errors_show(struct md_rdev *rdev, char *page)
2699 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
2703 errors_store(struct md_rdev *rdev, const char *buf, size_t len)
2708 rv = kstrtouint(buf, 10, &n);
2711 atomic_set(&rdev->corrected_errors, n);
2714 static struct rdev_sysfs_entry rdev_errors =
2715 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
2718 slot_show(struct md_rdev *rdev, char *page)
2720 if (rdev->raid_disk < 0)
2721 return sprintf(page, "none\n");
2723 return sprintf(page, "%d\n", rdev->raid_disk);
2727 slot_store(struct md_rdev *rdev, const char *buf, size_t len)
2732 if (strncmp(buf, "none", 4)==0)
2735 err = kstrtouint(buf, 10, (unsigned int *)&slot);
2739 if (rdev->mddev->pers && slot == -1) {
2740 /* Setting 'slot' on an active array requires also
2741 * updating the 'rd%d' link, and communicating
2742 * with the personality with ->hot_*_disk.
2743 * For now we only support removing
2744 * failed/spare devices. This normally happens automatically,
2745 * but not when the metadata is externally managed.
2747 if (rdev->raid_disk == -1)
2749 /* personality does all needed checks */
2750 if (rdev->mddev->pers->hot_remove_disk == NULL)
2752 clear_bit(Blocked, &rdev->flags);
2753 remove_and_add_spares(rdev->mddev, rdev);
2754 if (rdev->raid_disk >= 0)
2756 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2757 md_wakeup_thread(rdev->mddev->thread);
2758 } else if (rdev->mddev->pers) {
2759 /* Activating a spare .. or possibly reactivating
2760 * if we ever get bitmaps working here.
2763 if (rdev->raid_disk != -1)
2766 if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery))
2769 if (rdev->mddev->pers->hot_add_disk == NULL)
2772 if (slot >= rdev->mddev->raid_disks &&
2773 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
2776 rdev->raid_disk = slot;
2777 if (test_bit(In_sync, &rdev->flags))
2778 rdev->saved_raid_disk = slot;
2780 rdev->saved_raid_disk = -1;
2781 clear_bit(In_sync, &rdev->flags);
2782 clear_bit(Bitmap_sync, &rdev->flags);
2783 remove_and_add_spares(rdev->mddev, rdev);
2784 if (rdev->raid_disk == -1)
2786 /* don't wakeup anyone, leave that to userspace. */
2788 if (slot >= rdev->mddev->raid_disks &&
2789 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
2791 rdev->raid_disk = slot;
2792 /* assume it is working */
2793 clear_bit(Faulty, &rdev->flags);
2794 clear_bit(WriteMostly, &rdev->flags);
2795 set_bit(In_sync, &rdev->flags);
2796 sysfs_notify_dirent_safe(rdev->sysfs_state);
2801 static struct rdev_sysfs_entry rdev_slot =
2802 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
2805 offset_show(struct md_rdev *rdev, char *page)
2807 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
2811 offset_store(struct md_rdev *rdev, const char *buf, size_t len)
2813 unsigned long long offset;
2814 if (kstrtoull(buf, 10, &offset) < 0)
2816 if (rdev->mddev->pers && rdev->raid_disk >= 0)
2818 if (rdev->sectors && rdev->mddev->external)
2819 /* Must set offset before size, so overlap checks
2822 rdev->data_offset = offset;
2823 rdev->new_data_offset = offset;
2827 static struct rdev_sysfs_entry rdev_offset =
2828 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
2830 static ssize_t new_offset_show(struct md_rdev *rdev, char *page)
2832 return sprintf(page, "%llu\n",
2833 (unsigned long long)rdev->new_data_offset);
2836 static ssize_t new_offset_store(struct md_rdev *rdev,
2837 const char *buf, size_t len)
2839 unsigned long long new_offset;
2840 struct mddev *mddev = rdev->mddev;
2842 if (kstrtoull(buf, 10, &new_offset) < 0)
2845 if (mddev->sync_thread ||
2846 test_bit(MD_RECOVERY_RUNNING,&mddev->recovery))
2848 if (new_offset == rdev->data_offset)
2849 /* reset is always permitted */
2851 else if (new_offset > rdev->data_offset) {
2852 /* must not push array size beyond rdev_sectors */
2853 if (new_offset - rdev->data_offset
2854 + mddev->dev_sectors > rdev->sectors)
2857 /* Metadata worries about other space details. */
2859 /* decreasing the offset is inconsistent with a backwards
2862 if (new_offset < rdev->data_offset &&
2863 mddev->reshape_backwards)
2865 /* Increasing offset is inconsistent with forwards
2866 * reshape. reshape_direction should be set to
2867 * 'backwards' first.
2869 if (new_offset > rdev->data_offset &&
2870 !mddev->reshape_backwards)
2873 if (mddev->pers && mddev->persistent &&
2874 !super_types[mddev->major_version]
2875 .allow_new_offset(rdev, new_offset))
2877 rdev->new_data_offset = new_offset;
2878 if (new_offset > rdev->data_offset)
2879 mddev->reshape_backwards = 1;
2880 else if (new_offset < rdev->data_offset)
2881 mddev->reshape_backwards = 0;
2885 static struct rdev_sysfs_entry rdev_new_offset =
2886 __ATTR(new_offset, S_IRUGO|S_IWUSR, new_offset_show, new_offset_store);
2889 rdev_size_show(struct md_rdev *rdev, char *page)
2891 return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2);
2894 static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
2896 /* check if two start/length pairs overlap */
2904 static int strict_blocks_to_sectors(const char *buf, sector_t *sectors)
2906 unsigned long long blocks;
2909 if (kstrtoull(buf, 10, &blocks) < 0)
2912 if (blocks & 1ULL << (8 * sizeof(blocks) - 1))
2913 return -EINVAL; /* sector conversion overflow */
2916 if (new != blocks * 2)
2917 return -EINVAL; /* unsigned long long to sector_t overflow */
2924 rdev_size_store(struct md_rdev *rdev, const char *buf, size_t len)
2926 struct mddev *my_mddev = rdev->mddev;
2927 sector_t oldsectors = rdev->sectors;
2930 if (strict_blocks_to_sectors(buf, §ors) < 0)
2932 if (rdev->data_offset != rdev->new_data_offset)
2933 return -EINVAL; /* too confusing */
2934 if (my_mddev->pers && rdev->raid_disk >= 0) {
2935 if (my_mddev->persistent) {
2936 sectors = super_types[my_mddev->major_version].
2937 rdev_size_change(rdev, sectors);
2940 } else if (!sectors)
2941 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) -
2943 if (!my_mddev->pers->resize)
2944 /* Cannot change size for RAID0 or Linear etc */
2947 if (sectors < my_mddev->dev_sectors)
2948 return -EINVAL; /* component must fit device */
2950 rdev->sectors = sectors;
2951 if (sectors > oldsectors && my_mddev->external) {
2952 /* Need to check that all other rdevs with the same
2953 * ->bdev do not overlap. 'rcu' is sufficient to walk
2954 * the rdev lists safely.
2955 * This check does not provide a hard guarantee, it
2956 * just helps avoid dangerous mistakes.
2958 struct mddev *mddev;
2960 struct list_head *tmp;
2963 for_each_mddev(mddev, tmp) {
2964 struct md_rdev *rdev2;
2966 rdev_for_each(rdev2, mddev)
2967 if (rdev->bdev == rdev2->bdev &&
2969 overlaps(rdev->data_offset, rdev->sectors,
2982 /* Someone else could have slipped in a size
2983 * change here, but doing so is just silly.
2984 * We put oldsectors back because we *know* it is
2985 * safe, and trust userspace not to race with
2988 rdev->sectors = oldsectors;
2995 static struct rdev_sysfs_entry rdev_size =
2996 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
2998 static ssize_t recovery_start_show(struct md_rdev *rdev, char *page)
3000 unsigned long long recovery_start = rdev->recovery_offset;
3002 if (test_bit(In_sync, &rdev->flags) ||
3003 recovery_start == MaxSector)
3004 return sprintf(page, "none\n");
3006 return sprintf(page, "%llu\n", recovery_start);
3009 static ssize_t recovery_start_store(struct md_rdev *rdev, const char *buf, size_t len)
3011 unsigned long long recovery_start;
3013 if (cmd_match(buf, "none"))
3014 recovery_start = MaxSector;
3015 else if (kstrtoull(buf, 10, &recovery_start))
3018 if (rdev->mddev->pers &&
3019 rdev->raid_disk >= 0)
3022 rdev->recovery_offset = recovery_start;
3023 if (recovery_start == MaxSector)
3024 set_bit(In_sync, &rdev->flags);
3026 clear_bit(In_sync, &rdev->flags);
3030 static struct rdev_sysfs_entry rdev_recovery_start =
3031 __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store);
3034 badblocks_show(struct badblocks *bb, char *page, int unack);
3036 badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack);
3038 static ssize_t bb_show(struct md_rdev *rdev, char *page)
3040 return badblocks_show(&rdev->badblocks, page, 0);
3042 static ssize_t bb_store(struct md_rdev *rdev, const char *page, size_t len)
3044 int rv = badblocks_store(&rdev->badblocks, page, len, 0);
3045 /* Maybe that ack was all we needed */
3046 if (test_and_clear_bit(BlockedBadBlocks, &rdev->flags))
3047 wake_up(&rdev->blocked_wait);
3050 static struct rdev_sysfs_entry rdev_bad_blocks =
3051 __ATTR(bad_blocks, S_IRUGO|S_IWUSR, bb_show, bb_store);
3053 static ssize_t ubb_show(struct md_rdev *rdev, char *page)
3055 return badblocks_show(&rdev->badblocks, page, 1);
3057 static ssize_t ubb_store(struct md_rdev *rdev, const char *page, size_t len)
3059 return badblocks_store(&rdev->badblocks, page, len, 1);
3061 static struct rdev_sysfs_entry rdev_unack_bad_blocks =
3062 __ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store);
3064 static struct attribute *rdev_default_attrs[] = {
3069 &rdev_new_offset.attr,
3071 &rdev_recovery_start.attr,
3072 &rdev_bad_blocks.attr,
3073 &rdev_unack_bad_blocks.attr,
3077 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
3079 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3080 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3086 return entry->show(rdev, page);
3090 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
3091 const char *page, size_t length)
3093 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3094 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3096 struct mddev *mddev = rdev->mddev;
3100 if (!capable(CAP_SYS_ADMIN))
3102 rv = mddev ? mddev_lock(mddev): -EBUSY;
3104 if (rdev->mddev == NULL)
3107 rv = entry->store(rdev, page, length);
3108 mddev_unlock(mddev);
3113 static void rdev_free(struct kobject *ko)
3115 struct md_rdev *rdev = container_of(ko, struct md_rdev, kobj);
3118 static const struct sysfs_ops rdev_sysfs_ops = {
3119 .show = rdev_attr_show,
3120 .store = rdev_attr_store,
3122 static struct kobj_type rdev_ktype = {
3123 .release = rdev_free,
3124 .sysfs_ops = &rdev_sysfs_ops,
3125 .default_attrs = rdev_default_attrs,
3128 int md_rdev_init(struct md_rdev *rdev)
3131 rdev->saved_raid_disk = -1;
3132 rdev->raid_disk = -1;
3134 rdev->data_offset = 0;
3135 rdev->new_data_offset = 0;
3136 rdev->sb_events = 0;
3137 rdev->last_read_error.tv_sec = 0;
3138 rdev->last_read_error.tv_nsec = 0;
3139 rdev->sb_loaded = 0;
3140 rdev->bb_page = NULL;
3141 atomic_set(&rdev->nr_pending, 0);
3142 atomic_set(&rdev->read_errors, 0);
3143 atomic_set(&rdev->corrected_errors, 0);
3145 INIT_LIST_HEAD(&rdev->same_set);
3146 init_waitqueue_head(&rdev->blocked_wait);
3148 /* Add space to store bad block list.
3149 * This reserves the space even on arrays where it cannot
3150 * be used - I wonder if that matters
3152 rdev->badblocks.count = 0;
3153 rdev->badblocks.shift = -1; /* disabled until explicitly enabled */
3154 rdev->badblocks.page = kmalloc(PAGE_SIZE, GFP_KERNEL);
3155 seqlock_init(&rdev->badblocks.lock);
3156 if (rdev->badblocks.page == NULL)
3161 EXPORT_SYMBOL_GPL(md_rdev_init);
3163 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3165 * mark the device faulty if:
3167 * - the device is nonexistent (zero size)
3168 * - the device has no valid superblock
3170 * a faulty rdev _never_ has rdev->sb set.
3172 static struct md_rdev *md_import_device(dev_t newdev, int super_format, int super_minor)
3174 char b[BDEVNAME_SIZE];
3176 struct md_rdev *rdev;
3179 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
3181 printk(KERN_ERR "md: could not alloc mem for new device!\n");
3182 return ERR_PTR(-ENOMEM);
3185 err = md_rdev_init(rdev);
3188 err = alloc_disk_sb(rdev);
3192 err = lock_rdev(rdev, newdev, super_format == -2);
3196 kobject_init(&rdev->kobj, &rdev_ktype);
3198 size = i_size_read(rdev->bdev->bd_inode) >> BLOCK_SIZE_BITS;
3201 "md: %s has zero or unknown size, marking faulty!\n",
3202 bdevname(rdev->bdev,b));
3207 if (super_format >= 0) {
3208 err = super_types[super_format].
3209 load_super(rdev, NULL, super_minor);
3210 if (err == -EINVAL) {
3212 "md: %s does not have a valid v%d.%d "
3213 "superblock, not importing!\n",
3214 bdevname(rdev->bdev,b),
3215 super_format, super_minor);
3220 "md: could not read %s's sb, not importing!\n",
3221 bdevname(rdev->bdev,b));
3231 md_rdev_clear(rdev);
3233 return ERR_PTR(err);
3237 * Check a full RAID array for plausibility
3240 static void analyze_sbs(struct mddev *mddev)
3243 struct md_rdev *rdev, *freshest, *tmp;
3244 char b[BDEVNAME_SIZE];
3247 rdev_for_each_safe(rdev, tmp, mddev)
3248 switch (super_types[mddev->major_version].
3249 load_super(rdev, freshest, mddev->minor_version)) {
3257 "md: fatal superblock inconsistency in %s"
3258 " -- removing from array\n",
3259 bdevname(rdev->bdev,b));
3260 md_kick_rdev_from_array(rdev);
3263 super_types[mddev->major_version].
3264 validate_super(mddev, freshest);
3267 rdev_for_each_safe(rdev, tmp, mddev) {
3268 if (mddev->max_disks &&
3269 (rdev->desc_nr >= mddev->max_disks ||
3270 i > mddev->max_disks)) {
3272 "md: %s: %s: only %d devices permitted\n",
3273 mdname(mddev), bdevname(rdev->bdev, b),
3275 md_kick_rdev_from_array(rdev);
3278 if (rdev != freshest) {
3279 if (super_types[mddev->major_version].
3280 validate_super(mddev, rdev)) {
3281 printk(KERN_WARNING "md: kicking non-fresh %s"
3283 bdevname(rdev->bdev,b));
3284 md_kick_rdev_from_array(rdev);
3288 if (mddev->level == LEVEL_MULTIPATH) {
3289 rdev->desc_nr = i++;
3290 rdev->raid_disk = rdev->desc_nr;
3291 set_bit(In_sync, &rdev->flags);
3292 } else if (rdev->raid_disk >= (mddev->raid_disks - min(0, mddev->delta_disks))) {
3293 rdev->raid_disk = -1;
3294 clear_bit(In_sync, &rdev->flags);
3299 /* Read a fixed-point number.
3300 * Numbers in sysfs attributes should be in "standard" units where
3301 * possible, so time should be in seconds.
3302 * However we internally use a a much smaller unit such as
3303 * milliseconds or jiffies.
3304 * This function takes a decimal number with a possible fractional
3305 * component, and produces an integer which is the result of
3306 * multiplying that number by 10^'scale'.
3307 * all without any floating-point arithmetic.
3309 int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale)
3311 unsigned long result = 0;
3313 while (isdigit(*cp) || (*cp == '.' && decimals < 0)) {
3316 else if (decimals < scale) {
3319 result = result * 10 + value;
3331 while (decimals < scale) {
3340 safe_delay_show(struct mddev *mddev, char *page)
3342 int msec = (mddev->safemode_delay*1000)/HZ;
3343 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
3346 safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len)
3350 if (mddev_is_clustered(mddev)) {
3351 pr_info("md: Safemode is disabled for clustered mode\n");
3355 if (strict_strtoul_scaled(cbuf, &msec, 3) < 0)
3358 mddev->safemode_delay = 0;
3360 unsigned long old_delay = mddev->safemode_delay;
3361 unsigned long new_delay = (msec*HZ)/1000;
3365 mddev->safemode_delay = new_delay;
3366 if (new_delay < old_delay || old_delay == 0)
3367 mod_timer(&mddev->safemode_timer, jiffies+1);
3371 static struct md_sysfs_entry md_safe_delay =
3372 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
3375 level_show(struct mddev *mddev, char *page)
3377 struct md_personality *p;
3379 spin_lock(&mddev->lock);
3382 ret = sprintf(page, "%s\n", p->name);
3383 else if (mddev->clevel[0])
3384 ret = sprintf(page, "%s\n", mddev->clevel);
3385 else if (mddev->level != LEVEL_NONE)
3386 ret = sprintf(page, "%d\n", mddev->level);
3389 spin_unlock(&mddev->lock);
3394 level_store(struct mddev *mddev, const char *buf, size_t len)
3399 struct md_personality *pers, *oldpers;
3401 void *priv, *oldpriv;
3402 struct md_rdev *rdev;
3404 if (slen == 0 || slen >= sizeof(clevel))
3407 rv = mddev_lock(mddev);
3411 if (mddev->pers == NULL) {
3412 strncpy(mddev->clevel, buf, slen);
3413 if (mddev->clevel[slen-1] == '\n')
3415 mddev->clevel[slen] = 0;
3416 mddev->level = LEVEL_NONE;
3424 /* request to change the personality. Need to ensure:
3425 * - array is not engaged in resync/recovery/reshape
3426 * - old personality can be suspended
3427 * - new personality will access other array.
3431 if (mddev->sync_thread ||
3432 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3433 mddev->reshape_position != MaxSector ||
3434 mddev->sysfs_active)
3438 if (!mddev->pers->quiesce) {
3439 printk(KERN_WARNING "md: %s: %s does not support online personality change\n",
3440 mdname(mddev), mddev->pers->name);
3444 /* Now find the new personality */
3445 strncpy(clevel, buf, slen);
3446 if (clevel[slen-1] == '\n')
3449 if (kstrtol(clevel, 10, &level))
3452 if (request_module("md-%s", clevel) != 0)
3453 request_module("md-level-%s", clevel);
3454 spin_lock(&pers_lock);
3455 pers = find_pers(level, clevel);
3456 if (!pers || !try_module_get(pers->owner)) {
3457 spin_unlock(&pers_lock);
3458 printk(KERN_WARNING "md: personality %s not loaded\n", clevel);
3462 spin_unlock(&pers_lock);
3464 if (pers == mddev->pers) {
3465 /* Nothing to do! */
3466 module_put(pers->owner);
3470 if (!pers->takeover) {
3471 module_put(pers->owner);
3472 printk(KERN_WARNING "md: %s: %s does not support personality takeover\n",
3473 mdname(mddev), clevel);
3478 rdev_for_each(rdev, mddev)
3479 rdev->new_raid_disk = rdev->raid_disk;
3481 /* ->takeover must set new_* and/or delta_disks
3482 * if it succeeds, and may set them when it fails.
3484 priv = pers->takeover(mddev);
3486 mddev->new_level = mddev->level;
3487 mddev->new_layout = mddev->layout;
3488 mddev->new_chunk_sectors = mddev->chunk_sectors;
3489 mddev->raid_disks -= mddev->delta_disks;
3490 mddev->delta_disks = 0;
3491 mddev->reshape_backwards = 0;
3492 module_put(pers->owner);
3493 printk(KERN_WARNING "md: %s: %s would not accept array\n",
3494 mdname(mddev), clevel);
3499 /* Looks like we have a winner */
3500 mddev_suspend(mddev);
3501 mddev_detach(mddev);
3503 spin_lock(&mddev->lock);
3504 oldpers = mddev->pers;
3505 oldpriv = mddev->private;
3507 mddev->private = priv;
3508 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
3509 mddev->level = mddev->new_level;
3510 mddev->layout = mddev->new_layout;
3511 mddev->chunk_sectors = mddev->new_chunk_sectors;
3512 mddev->delta_disks = 0;
3513 mddev->reshape_backwards = 0;
3514 mddev->degraded = 0;
3515 spin_unlock(&mddev->lock);
3517 if (oldpers->sync_request == NULL &&
3519 /* We are converting from a no-redundancy array
3520 * to a redundancy array and metadata is managed
3521 * externally so we need to be sure that writes
3522 * won't block due to a need to transition
3524 * until external management is started.
3527 mddev->safemode_delay = 0;
3528 mddev->safemode = 0;
3531 oldpers->free(mddev, oldpriv);
3533 if (oldpers->sync_request == NULL &&
3534 pers->sync_request != NULL) {
3535 /* need to add the md_redundancy_group */
3536 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
3538 "md: cannot register extra attributes for %s\n",
3540 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action");
3542 if (oldpers->sync_request != NULL &&
3543 pers->sync_request == NULL) {
3544 /* need to remove the md_redundancy_group */
3545 if (mddev->to_remove == NULL)
3546 mddev->to_remove = &md_redundancy_group;
3549 rdev_for_each(rdev, mddev) {
3550 if (rdev->raid_disk < 0)
3552 if (rdev->new_raid_disk >= mddev->raid_disks)
3553 rdev->new_raid_disk = -1;
3554 if (rdev->new_raid_disk == rdev->raid_disk)
3556 sysfs_unlink_rdev(mddev, rdev);
3558 rdev_for_each(rdev, mddev) {
3559 if (rdev->raid_disk < 0)
3561 if (rdev->new_raid_disk == rdev->raid_disk)
3563 rdev->raid_disk = rdev->new_raid_disk;
3564 if (rdev->raid_disk < 0)
3565 clear_bit(In_sync, &rdev->flags);
3567 if (sysfs_link_rdev(mddev, rdev))
3568 printk(KERN_WARNING "md: cannot register rd%d"
3569 " for %s after level change\n",
3570 rdev->raid_disk, mdname(mddev));
3574 if (pers->sync_request == NULL) {
3575 /* this is now an array without redundancy, so
3576 * it must always be in_sync
3579 del_timer_sync(&mddev->safemode_timer);
3581 blk_set_stacking_limits(&mddev->queue->limits);
3583 set_bit(MD_CHANGE_DEVS, &mddev->flags);
3584 mddev_resume(mddev);
3586 md_update_sb(mddev, 1);
3587 sysfs_notify(&mddev->kobj, NULL, "level");
3588 md_new_event(mddev);
3591 mddev_unlock(mddev);
3595 static struct md_sysfs_entry md_level =
3596 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
3599 layout_show(struct mddev *mddev, char *page)
3601 /* just a number, not meaningful for all levels */
3602 if (mddev->reshape_position != MaxSector &&
3603 mddev->layout != mddev->new_layout)
3604 return sprintf(page, "%d (%d)\n",
3605 mddev->new_layout, mddev->layout);
3606 return sprintf(page, "%d\n", mddev->layout);
3610 layout_store(struct mddev *mddev, const char *buf, size_t len)
3615 err = kstrtouint(buf, 10, &n);
3618 err = mddev_lock(mddev);
3623 if (mddev->pers->check_reshape == NULL)
3628 mddev->new_layout = n;
3629 err = mddev->pers->check_reshape(mddev);
3631 mddev->new_layout = mddev->layout;
3634 mddev->new_layout = n;
3635 if (mddev->reshape_position == MaxSector)
3638 mddev_unlock(mddev);
3641 static struct md_sysfs_entry md_layout =
3642 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
3645 raid_disks_show(struct mddev *mddev, char *page)
3647 if (mddev->raid_disks == 0)
3649 if (mddev->reshape_position != MaxSector &&
3650 mddev->delta_disks != 0)
3651 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
3652 mddev->raid_disks - mddev->delta_disks);
3653 return sprintf(page, "%d\n", mddev->raid_disks);
3656 static int update_raid_disks(struct mddev *mddev, int raid_disks);
3659 raid_disks_store(struct mddev *mddev, const char *buf, size_t len)
3664 err = kstrtouint(buf, 10, &n);
3668 err = mddev_lock(mddev);
3672 err = update_raid_disks(mddev, n);
3673 else if (mddev->reshape_position != MaxSector) {
3674 struct md_rdev *rdev;
3675 int olddisks = mddev->raid_disks - mddev->delta_disks;
3678 rdev_for_each(rdev, mddev) {
3680 rdev->data_offset < rdev->new_data_offset)
3683 rdev->data_offset > rdev->new_data_offset)
3687 mddev->delta_disks = n - olddisks;
3688 mddev->raid_disks = n;
3689 mddev->reshape_backwards = (mddev->delta_disks < 0);
3691 mddev->raid_disks = n;
3693 mddev_unlock(mddev);
3694 return err ? err : len;
3696 static struct md_sysfs_entry md_raid_disks =
3697 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
3700 chunk_size_show(struct mddev *mddev, char *page)
3702 if (mddev->reshape_position != MaxSector &&
3703 mddev->chunk_sectors != mddev->new_chunk_sectors)
3704 return sprintf(page, "%d (%d)\n",
3705 mddev->new_chunk_sectors << 9,
3706 mddev->chunk_sectors << 9);
3707 return sprintf(page, "%d\n", mddev->chunk_sectors << 9);
3711 chunk_size_store(struct mddev *mddev, const char *buf, size_t len)
3716 err = kstrtoul(buf, 10, &n);
3720 err = mddev_lock(mddev);
3724 if (mddev->pers->check_reshape == NULL)
3729 mddev->new_chunk_sectors = n >> 9;
3730 err = mddev->pers->check_reshape(mddev);
3732 mddev->new_chunk_sectors = mddev->chunk_sectors;
3735 mddev->new_chunk_sectors = n >> 9;
3736 if (mddev->reshape_position == MaxSector)
3737 mddev->chunk_sectors = n >> 9;
3739 mddev_unlock(mddev);
3742 static struct md_sysfs_entry md_chunk_size =
3743 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
3746 resync_start_show(struct mddev *mddev, char *page)
3748 if (mddev->recovery_cp == MaxSector)
3749 return sprintf(page, "none\n");
3750 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
3754 resync_start_store(struct mddev *mddev, const char *buf, size_t len)
3756 unsigned long long n;
3759 if (cmd_match(buf, "none"))
3762 err = kstrtoull(buf, 10, &n);
3765 if (n != (sector_t)n)
3769 err = mddev_lock(mddev);
3772 if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
3776 mddev->recovery_cp = n;
3778 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
3780 mddev_unlock(mddev);
3783 static struct md_sysfs_entry md_resync_start =
3784 __ATTR_PREALLOC(resync_start, S_IRUGO|S_IWUSR,
3785 resync_start_show, resync_start_store);
3788 * The array state can be:
3791 * No devices, no size, no level
3792 * Equivalent to STOP_ARRAY ioctl
3794 * May have some settings, but array is not active
3795 * all IO results in error
3796 * When written, doesn't tear down array, but just stops it
3797 * suspended (not supported yet)
3798 * All IO requests will block. The array can be reconfigured.
3799 * Writing this, if accepted, will block until array is quiescent
3801 * no resync can happen. no superblocks get written.
3802 * write requests fail
3804 * like readonly, but behaves like 'clean' on a write request.
3806 * clean - no pending writes, but otherwise active.
3807 * When written to inactive array, starts without resync
3808 * If a write request arrives then
3809 * if metadata is known, mark 'dirty' and switch to 'active'.
3810 * if not known, block and switch to write-pending
3811 * If written to an active array that has pending writes, then fails.
3813 * fully active: IO and resync can be happening.
3814 * When written to inactive array, starts with resync
3817 * clean, but writes are blocked waiting for 'active' to be written.
3820 * like active, but no writes have been seen for a while (100msec).
3823 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
3824 write_pending, active_idle, bad_word};
3825 static char *array_states[] = {
3826 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3827 "write-pending", "active-idle", NULL };
3829 static int match_word(const char *word, char **list)
3832 for (n=0; list[n]; n++)
3833 if (cmd_match(word, list[n]))
3839 array_state_show(struct mddev *mddev, char *page)
3841 enum array_state st = inactive;
3854 else if (test_bit(MD_CHANGE_PENDING, &mddev->flags))
3856 else if (mddev->safemode)
3862 if (list_empty(&mddev->disks) &&
3863 mddev->raid_disks == 0 &&
3864 mddev->dev_sectors == 0)
3869 return sprintf(page, "%s\n", array_states[st]);
3872 static int do_md_stop(struct mddev *mddev, int ro, struct block_device *bdev);
3873 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev);
3874 static int do_md_run(struct mddev *mddev);
3875 static int restart_array(struct mddev *mddev);
3878 array_state_store(struct mddev *mddev, const char *buf, size_t len)
3881 enum array_state st = match_word(buf, array_states);
3883 if (mddev->pers && (st == active || st == clean) && mddev->ro != 1) {
3884 /* don't take reconfig_mutex when toggling between
3887 spin_lock(&mddev->lock);
3889 restart_array(mddev);
3890 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
3891 wake_up(&mddev->sb_wait);
3893 } else /* st == clean */ {
3894 restart_array(mddev);
3895 if (atomic_read(&mddev->writes_pending) == 0) {
3896 if (mddev->in_sync == 0) {
3898 if (mddev->safemode == 1)
3899 mddev->safemode = 0;
3900 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
3906 spin_unlock(&mddev->lock);
3909 err = mddev_lock(mddev);
3917 /* stopping an active array */
3918 err = do_md_stop(mddev, 0, NULL);
3921 /* stopping an active array */
3923 err = do_md_stop(mddev, 2, NULL);
3925 err = 0; /* already inactive */
3928 break; /* not supported yet */
3931 err = md_set_readonly(mddev, NULL);
3934 set_disk_ro(mddev->gendisk, 1);
3935 err = do_md_run(mddev);
3941 err = md_set_readonly(mddev, NULL);
3942 else if (mddev->ro == 1)
3943 err = restart_array(mddev);
3946 set_disk_ro(mddev->gendisk, 0);
3950 err = do_md_run(mddev);
3955 restart_array(mddev);
3956 spin_lock(&mddev->lock);
3957 if (atomic_read(&mddev->writes_pending) == 0) {
3958 if (mddev->in_sync == 0) {
3960 if (mddev->safemode == 1)
3961 mddev->safemode = 0;
3962 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
3967 spin_unlock(&mddev->lock);
3973 restart_array(mddev);
3974 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
3975 wake_up(&mddev->sb_wait);
3979 set_disk_ro(mddev->gendisk, 0);
3980 err = do_md_run(mddev);
3985 /* these cannot be set */
3990 if (mddev->hold_active == UNTIL_IOCTL)
3991 mddev->hold_active = 0;
3992 sysfs_notify_dirent_safe(mddev->sysfs_state);
3994 mddev_unlock(mddev);
3997 static struct md_sysfs_entry md_array_state =
3998 __ATTR_PREALLOC(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
4001 max_corrected_read_errors_show(struct mddev *mddev, char *page) {
4002 return sprintf(page, "%d\n",
4003 atomic_read(&mddev->max_corr_read_errors));
4007 max_corrected_read_errors_store(struct mddev *mddev, const char *buf, size_t len)
4012 rv = kstrtouint(buf, 10, &n);
4015 atomic_set(&mddev->max_corr_read_errors, n);
4019 static struct md_sysfs_entry max_corr_read_errors =
4020 __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show,
4021 max_corrected_read_errors_store);
4024 null_show(struct mddev *mddev, char *page)
4030 new_dev_store(struct mddev *mddev, const char *buf, size_t len)
4032 /* buf must be %d:%d\n? giving major and minor numbers */
4033 /* The new device is added to the array.
4034 * If the array has a persistent superblock, we read the
4035 * superblock to initialise info and check validity.
4036 * Otherwise, only checking done is that in bind_rdev_to_array,
4037 * which mainly checks size.
4040 int major = simple_strtoul(buf, &e, 10);
4043 struct md_rdev *rdev;
4046 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
4048 minor = simple_strtoul(e+1, &e, 10);
4049 if (*e && *e != '\n')
4051 dev = MKDEV(major, minor);
4052 if (major != MAJOR(dev) ||
4053 minor != MINOR(dev))
4056 flush_workqueue(md_misc_wq);
4058 err = mddev_lock(mddev);
4061 if (mddev->persistent) {
4062 rdev = md_import_device(dev, mddev->major_version,
4063 mddev->minor_version);
4064 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
4065 struct md_rdev *rdev0
4066 = list_entry(mddev->disks.next,
4067 struct md_rdev, same_set);
4068 err = super_types[mddev->major_version]
4069 .load_super(rdev, rdev0, mddev->minor_version);
4073 } else if (mddev->external)
4074 rdev = md_import_device(dev, -2, -1);
4076 rdev = md_import_device(dev, -1, -1);
4079 mddev_unlock(mddev);
4080 return PTR_ERR(rdev);
4082 err = bind_rdev_to_array(rdev, mddev);
4086 mddev_unlock(mddev);
4087 return err ? err : len;
4090 static struct md_sysfs_entry md_new_device =
4091 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
4094 bitmap_store(struct mddev *mddev, const char *buf, size_t len)
4097 unsigned long chunk, end_chunk;
4100 err = mddev_lock(mddev);
4105 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
4107 chunk = end_chunk = simple_strtoul(buf, &end, 0);
4108 if (buf == end) break;
4109 if (*end == '-') { /* range */
4111 end_chunk = simple_strtoul(buf, &end, 0);
4112 if (buf == end) break;
4114 if (*end && !isspace(*end)) break;
4115 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
4116 buf = skip_spaces(end);
4118 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
4120 mddev_unlock(mddev);
4124 static struct md_sysfs_entry md_bitmap =
4125 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
4128 size_show(struct mddev *mddev, char *page)
4130 return sprintf(page, "%llu\n",
4131 (unsigned long long)mddev->dev_sectors / 2);
4134 static int update_size(struct mddev *mddev, sector_t num_sectors);
4137 size_store(struct mddev *mddev, const char *buf, size_t len)
4139 /* If array is inactive, we can reduce the component size, but
4140 * not increase it (except from 0).
4141 * If array is active, we can try an on-line resize
4144 int err = strict_blocks_to_sectors(buf, §ors);
4148 err = mddev_lock(mddev);
4152 err = update_size(mddev, sectors);
4153 md_update_sb(mddev, 1);
4155 if (mddev->dev_sectors == 0 ||
4156 mddev->dev_sectors > sectors)
4157 mddev->dev_sectors = sectors;
4161 mddev_unlock(mddev);
4162 return err ? err : len;
4165 static struct md_sysfs_entry md_size =
4166 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
4168 /* Metadata version.
4170 * 'none' for arrays with no metadata (good luck...)
4171 * 'external' for arrays with externally managed metadata,
4172 * or N.M for internally known formats
4175 metadata_show(struct mddev *mddev, char *page)
4177 if (mddev->persistent)
4178 return sprintf(page, "%d.%d\n",
4179 mddev->major_version, mddev->minor_version);
4180 else if (mddev->external)
4181 return sprintf(page, "external:%s\n", mddev->metadata_type);
4183 return sprintf(page, "none\n");
4187 metadata_store(struct mddev *mddev, const char *buf, size_t len)
4192 /* Changing the details of 'external' metadata is
4193 * always permitted. Otherwise there must be
4194 * no devices attached to the array.
4197 err = mddev_lock(mddev);
4201 if (mddev->external && strncmp(buf, "external:", 9) == 0)
4203 else if (!list_empty(&mddev->disks))
4207 if (cmd_match(buf, "none")) {
4208 mddev->persistent = 0;
4209 mddev->external = 0;
4210 mddev->major_version = 0;
4211 mddev->minor_version = 90;
4214 if (strncmp(buf, "external:", 9) == 0) {
4215 size_t namelen = len-9;
4216 if (namelen >= sizeof(mddev->metadata_type))
4217 namelen = sizeof(mddev->metadata_type)-1;
4218 strncpy(mddev->metadata_type, buf+9, namelen);
4219 mddev->metadata_type[namelen] = 0;
4220 if (namelen && mddev->metadata_type[namelen-1] == '\n')
4221 mddev->metadata_type[--namelen] = 0;
4222 mddev->persistent = 0;
4223 mddev->external = 1;
4224 mddev->major_version = 0;
4225 mddev->minor_version = 90;
4228 major = simple_strtoul(buf, &e, 10);
4230 if (e==buf || *e != '.')
4233 minor = simple_strtoul(buf, &e, 10);
4234 if (e==buf || (*e && *e != '\n') )
4237 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
4239 mddev->major_version = major;
4240 mddev->minor_version = minor;
4241 mddev->persistent = 1;
4242 mddev->external = 0;
4245 mddev_unlock(mddev);
4249 static struct md_sysfs_entry md_metadata =
4250 __ATTR_PREALLOC(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
4253 action_show(struct mddev *mddev, char *page)
4255 char *type = "idle";
4256 unsigned long recovery = mddev->recovery;
4257 if (test_bit(MD_RECOVERY_FROZEN, &recovery))
4259 else if (test_bit(MD_RECOVERY_RUNNING, &recovery) ||
4260 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &recovery))) {
4261 if (test_bit(MD_RECOVERY_RESHAPE, &recovery))
4263 else if (test_bit(MD_RECOVERY_SYNC, &recovery)) {
4264 if (!test_bit(MD_RECOVERY_REQUESTED, &recovery))
4266 else if (test_bit(MD_RECOVERY_CHECK, &recovery))
4270 } else if (test_bit(MD_RECOVERY_RECOVER, &recovery))
4272 else if (mddev->reshape_position != MaxSector)
4275 return sprintf(page, "%s\n", type);
4279 action_store(struct mddev *mddev, const char *page, size_t len)
4281 if (!mddev->pers || !mddev->pers->sync_request)
4285 if (cmd_match(page, "idle") || cmd_match(page, "frozen")) {
4286 if (cmd_match(page, "frozen"))
4287 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4289 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4290 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
4291 mddev_lock(mddev) == 0) {
4292 flush_workqueue(md_misc_wq);
4293 if (mddev->sync_thread) {
4294 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4295 md_reap_sync_thread(mddev);
4297 mddev_unlock(mddev);
4299 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
4300 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
4302 else if (cmd_match(page, "resync"))
4303 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4304 else if (cmd_match(page, "recover")) {
4305 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4306 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
4307 } else if (cmd_match(page, "reshape")) {
4309 if (mddev->pers->start_reshape == NULL)
4311 err = mddev_lock(mddev);
4313 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4314 err = mddev->pers->start_reshape(mddev);
4315 mddev_unlock(mddev);
4319 sysfs_notify(&mddev->kobj, NULL, "degraded");
4321 if (cmd_match(page, "check"))
4322 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
4323 else if (!cmd_match(page, "repair"))
4325 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4326 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
4327 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
4329 if (mddev->ro == 2) {
4330 /* A write to sync_action is enough to justify
4331 * canceling read-auto mode
4334 md_wakeup_thread(mddev->sync_thread);
4336 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4337 md_wakeup_thread(mddev->thread);
4338 sysfs_notify_dirent_safe(mddev->sysfs_action);
4342 static struct md_sysfs_entry md_scan_mode =
4343 __ATTR_PREALLOC(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
4346 last_sync_action_show(struct mddev *mddev, char *page)
4348 return sprintf(page, "%s\n", mddev->last_sync_action);
4351 static struct md_sysfs_entry md_last_scan_mode = __ATTR_RO(last_sync_action);
4354 mismatch_cnt_show(struct mddev *mddev, char *page)
4356 return sprintf(page, "%llu\n",
4357 (unsigned long long)
4358 atomic64_read(&mddev->resync_mismatches));
4361 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
4364 sync_min_show(struct mddev *mddev, char *page)
4366 return sprintf(page, "%d (%s)\n", speed_min(mddev),
4367 mddev->sync_speed_min ? "local": "system");
4371 sync_min_store(struct mddev *mddev, const char *buf, size_t len)
4376 if (strncmp(buf, "system", 6)==0) {
4379 rv = kstrtouint(buf, 10, &min);
4385 mddev->sync_speed_min = min;
4389 static struct md_sysfs_entry md_sync_min =
4390 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
4393 sync_max_show(struct mddev *mddev, char *page)
4395 return sprintf(page, "%d (%s)\n", speed_max(mddev),
4396 mddev->sync_speed_max ? "local": "system");
4400 sync_max_store(struct mddev *mddev, const char *buf, size_t len)
4405 if (strncmp(buf, "system", 6)==0) {
4408 rv = kstrtouint(buf, 10, &max);
4414 mddev->sync_speed_max = max;
4418 static struct md_sysfs_entry md_sync_max =
4419 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
4422 degraded_show(struct mddev *mddev, char *page)
4424 return sprintf(page, "%d\n", mddev->degraded);
4426 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
4429 sync_force_parallel_show(struct mddev *mddev, char *page)
4431 return sprintf(page, "%d\n", mddev->parallel_resync);
4435 sync_force_parallel_store(struct mddev *mddev, const char *buf, size_t len)
4439 if (kstrtol(buf, 10, &n))
4442 if (n != 0 && n != 1)
4445 mddev->parallel_resync = n;
4447 if (mddev->sync_thread)
4448 wake_up(&resync_wait);
4453 /* force parallel resync, even with shared block devices */
4454 static struct md_sysfs_entry md_sync_force_parallel =
4455 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
4456 sync_force_parallel_show, sync_force_parallel_store);
4459 sync_speed_show(struct mddev *mddev, char *page)
4461 unsigned long resync, dt, db;
4462 if (mddev->curr_resync == 0)
4463 return sprintf(page, "none\n");
4464 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
4465 dt = (jiffies - mddev->resync_mark) / HZ;
4467 db = resync - mddev->resync_mark_cnt;
4468 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
4471 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
4474 sync_completed_show(struct mddev *mddev, char *page)
4476 unsigned long long max_sectors, resync;
4478 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4479 return sprintf(page, "none\n");
4481 if (mddev->curr_resync == 1 ||
4482 mddev->curr_resync == 2)
4483 return sprintf(page, "delayed\n");
4485 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
4486 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
4487 max_sectors = mddev->resync_max_sectors;
4489 max_sectors = mddev->dev_sectors;
4491 resync = mddev->curr_resync_completed;
4492 return sprintf(page, "%llu / %llu\n", resync, max_sectors);
4495 static struct md_sysfs_entry md_sync_completed =
4496 __ATTR_PREALLOC(sync_completed, S_IRUGO, sync_completed_show, NULL);
4499 min_sync_show(struct mddev *mddev, char *page)
4501 return sprintf(page, "%llu\n",
4502 (unsigned long long)mddev->resync_min);
4505 min_sync_store(struct mddev *mddev, const char *buf, size_t len)
4507 unsigned long long min;
4510 if (kstrtoull(buf, 10, &min))
4513 spin_lock(&mddev->lock);
4515 if (min > mddev->resync_max)
4519 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4522 /* Round down to multiple of 4K for safety */
4523 mddev->resync_min = round_down(min, 8);
4527 spin_unlock(&mddev->lock);
4531 static struct md_sysfs_entry md_min_sync =
4532 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
4535 max_sync_show(struct mddev *mddev, char *page)
4537 if (mddev->resync_max == MaxSector)
4538 return sprintf(page, "max\n");
4540 return sprintf(page, "%llu\n",
4541 (unsigned long long)mddev->resync_max);
4544 max_sync_store(struct mddev *mddev, const char *buf, size_t len)
4547 spin_lock(&mddev->lock);
4548 if (strncmp(buf, "max", 3) == 0)
4549 mddev->resync_max = MaxSector;
4551 unsigned long long max;
4555 if (kstrtoull(buf, 10, &max))
4557 if (max < mddev->resync_min)
4561 if (max < mddev->resync_max &&
4563 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4566 /* Must be a multiple of chunk_size */
4567 chunk = mddev->chunk_sectors;
4569 sector_t temp = max;
4572 if (sector_div(temp, chunk))
4575 mddev->resync_max = max;
4577 wake_up(&mddev->recovery_wait);
4580 spin_unlock(&mddev->lock);
4584 static struct md_sysfs_entry md_max_sync =
4585 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
4588 suspend_lo_show(struct mddev *mddev, char *page)
4590 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
4594 suspend_lo_store(struct mddev *mddev, const char *buf, size_t len)
4596 unsigned long long old, new;
4599 err = kstrtoull(buf, 10, &new);
4602 if (new != (sector_t)new)
4605 err = mddev_lock(mddev);
4609 if (mddev->pers == NULL ||
4610 mddev->pers->quiesce == NULL)
4612 old = mddev->suspend_lo;
4613 mddev->suspend_lo = new;
4615 /* Shrinking suspended region */
4616 mddev->pers->quiesce(mddev, 2);
4618 /* Expanding suspended region - need to wait */
4619 mddev->pers->quiesce(mddev, 1);
4620 mddev->pers->quiesce(mddev, 0);
4624 mddev_unlock(mddev);
4627 static struct md_sysfs_entry md_suspend_lo =
4628 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
4631 suspend_hi_show(struct mddev *mddev, char *page)
4633 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
4637 suspend_hi_store(struct mddev *mddev, const char *buf, size_t len)
4639 unsigned long long old, new;
4642 err = kstrtoull(buf, 10, &new);
4645 if (new != (sector_t)new)
4648 err = mddev_lock(mddev);
4652 if (mddev->pers == NULL ||
4653 mddev->pers->quiesce == NULL)
4655 old = mddev->suspend_hi;
4656 mddev->suspend_hi = new;
4658 /* Shrinking suspended region */
4659 mddev->pers->quiesce(mddev, 2);
4661 /* Expanding suspended region - need to wait */
4662 mddev->pers->quiesce(mddev, 1);
4663 mddev->pers->quiesce(mddev, 0);
4667 mddev_unlock(mddev);
4670 static struct md_sysfs_entry md_suspend_hi =
4671 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
4674 reshape_position_show(struct mddev *mddev, char *page)
4676 if (mddev->reshape_position != MaxSector)
4677 return sprintf(page, "%llu\n",
4678 (unsigned long long)mddev->reshape_position);
4679 strcpy(page, "none\n");
4684 reshape_position_store(struct mddev *mddev, const char *buf, size_t len)
4686 struct md_rdev *rdev;
4687 unsigned long long new;
4690 err = kstrtoull(buf, 10, &new);
4693 if (new != (sector_t)new)
4695 err = mddev_lock(mddev);
4701 mddev->reshape_position = new;
4702 mddev->delta_disks = 0;
4703 mddev->reshape_backwards = 0;
4704 mddev->new_level = mddev->level;
4705 mddev->new_layout = mddev->layout;
4706 mddev->new_chunk_sectors = mddev->chunk_sectors;
4707 rdev_for_each(rdev, mddev)
4708 rdev->new_data_offset = rdev->data_offset;
4711 mddev_unlock(mddev);
4715 static struct md_sysfs_entry md_reshape_position =
4716 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
4717 reshape_position_store);
4720 reshape_direction_show(struct mddev *mddev, char *page)
4722 return sprintf(page, "%s\n",
4723 mddev->reshape_backwards ? "backwards" : "forwards");
4727 reshape_direction_store(struct mddev *mddev, const char *buf, size_t len)
4732 if (cmd_match(buf, "forwards"))
4734 else if (cmd_match(buf, "backwards"))
4738 if (mddev->reshape_backwards == backwards)
4741 err = mddev_lock(mddev);
4744 /* check if we are allowed to change */
4745 if (mddev->delta_disks)
4747 else if (mddev->persistent &&
4748 mddev->major_version == 0)
4751 mddev->reshape_backwards = backwards;
4752 mddev_unlock(mddev);
4756 static struct md_sysfs_entry md_reshape_direction =
4757 __ATTR(reshape_direction, S_IRUGO|S_IWUSR, reshape_direction_show,
4758 reshape_direction_store);
4761 array_size_show(struct mddev *mddev, char *page)
4763 if (mddev->external_size)
4764 return sprintf(page, "%llu\n",
4765 (unsigned long long)mddev->array_sectors/2);
4767 return sprintf(page, "default\n");
4771 array_size_store(struct mddev *mddev, const char *buf, size_t len)
4776 err = mddev_lock(mddev);
4780 if (strncmp(buf, "default", 7) == 0) {
4782 sectors = mddev->pers->size(mddev, 0, 0);
4784 sectors = mddev->array_sectors;
4786 mddev->external_size = 0;
4788 if (strict_blocks_to_sectors(buf, §ors) < 0)
4790 else if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors)
4793 mddev->external_size = 1;
4797 mddev->array_sectors = sectors;
4799 set_capacity(mddev->gendisk, mddev->array_sectors);
4800 revalidate_disk(mddev->gendisk);
4803 mddev_unlock(mddev);
4807 static struct md_sysfs_entry md_array_size =
4808 __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show,
4811 static struct attribute *md_default_attrs[] = {
4814 &md_raid_disks.attr,
4815 &md_chunk_size.attr,
4817 &md_resync_start.attr,
4819 &md_new_device.attr,
4820 &md_safe_delay.attr,
4821 &md_array_state.attr,
4822 &md_reshape_position.attr,
4823 &md_reshape_direction.attr,
4824 &md_array_size.attr,
4825 &max_corr_read_errors.attr,
4829 static struct attribute *md_redundancy_attrs[] = {
4831 &md_last_scan_mode.attr,
4832 &md_mismatches.attr,
4835 &md_sync_speed.attr,
4836 &md_sync_force_parallel.attr,
4837 &md_sync_completed.attr,
4840 &md_suspend_lo.attr,
4841 &md_suspend_hi.attr,
4846 static struct attribute_group md_redundancy_group = {
4848 .attrs = md_redundancy_attrs,
4852 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
4854 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
4855 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
4860 spin_lock(&all_mddevs_lock);
4861 if (list_empty(&mddev->all_mddevs)) {
4862 spin_unlock(&all_mddevs_lock);
4866 spin_unlock(&all_mddevs_lock);
4868 rv = entry->show(mddev, page);
4874 md_attr_store(struct kobject *kobj, struct attribute *attr,
4875 const char *page, size_t length)
4877 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
4878 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
4883 if (!capable(CAP_SYS_ADMIN))
4885 spin_lock(&all_mddevs_lock);
4886 if (list_empty(&mddev->all_mddevs)) {
4887 spin_unlock(&all_mddevs_lock);
4891 spin_unlock(&all_mddevs_lock);
4892 rv = entry->store(mddev, page, length);
4897 static void md_free(struct kobject *ko)
4899 struct mddev *mddev = container_of(ko, struct mddev, kobj);
4901 if (mddev->sysfs_state)
4902 sysfs_put(mddev->sysfs_state);
4905 blk_cleanup_queue(mddev->queue);
4906 if (mddev->gendisk) {
4907 del_gendisk(mddev->gendisk);
4908 put_disk(mddev->gendisk);
4914 static const struct sysfs_ops md_sysfs_ops = {
4915 .show = md_attr_show,
4916 .store = md_attr_store,
4918 static struct kobj_type md_ktype = {
4920 .sysfs_ops = &md_sysfs_ops,
4921 .default_attrs = md_default_attrs,
4926 static void mddev_delayed_delete(struct work_struct *ws)
4928 struct mddev *mddev = container_of(ws, struct mddev, del_work);
4930 sysfs_remove_group(&mddev->kobj, &md_bitmap_group);
4931 kobject_del(&mddev->kobj);
4932 kobject_put(&mddev->kobj);
4935 static int md_alloc(dev_t dev, char *name)
4937 static DEFINE_MUTEX(disks_mutex);
4938 struct mddev *mddev = mddev_find(dev);
4939 struct gendisk *disk;
4948 partitioned = (MAJOR(mddev->unit) != MD_MAJOR);
4949 shift = partitioned ? MdpMinorShift : 0;
4950 unit = MINOR(mddev->unit) >> shift;
4952 /* wait for any previous instance of this device to be
4953 * completely removed (mddev_delayed_delete).
4955 flush_workqueue(md_misc_wq);
4957 mutex_lock(&disks_mutex);
4963 /* Need to ensure that 'name' is not a duplicate.
4965 struct mddev *mddev2;
4966 spin_lock(&all_mddevs_lock);
4968 list_for_each_entry(mddev2, &all_mddevs, all_mddevs)
4969 if (mddev2->gendisk &&
4970 strcmp(mddev2->gendisk->disk_name, name) == 0) {
4971 spin_unlock(&all_mddevs_lock);
4974 spin_unlock(&all_mddevs_lock);
4978 mddev->queue = blk_alloc_queue(GFP_KERNEL);
4981 mddev->queue->queuedata = mddev;
4983 blk_queue_make_request(mddev->queue, md_make_request);
4984 blk_set_stacking_limits(&mddev->queue->limits);
4986 disk = alloc_disk(1 << shift);
4988 blk_cleanup_queue(mddev->queue);
4989 mddev->queue = NULL;
4992 disk->major = MAJOR(mddev->unit);
4993 disk->first_minor = unit << shift;
4995 strcpy(disk->disk_name, name);
4996 else if (partitioned)
4997 sprintf(disk->disk_name, "md_d%d", unit);
4999 sprintf(disk->disk_name, "md%d", unit);
5000 disk->fops = &md_fops;
5001 disk->private_data = mddev;
5002 disk->queue = mddev->queue;
5003 blk_queue_flush(mddev->queue, REQ_FLUSH | REQ_FUA);
5004 /* Allow extended partitions. This makes the
5005 * 'mdp' device redundant, but we can't really
5008 disk->flags |= GENHD_FL_EXT_DEVT;
5009 mddev->gendisk = disk;
5010 /* As soon as we call add_disk(), another thread could get
5011 * through to md_open, so make sure it doesn't get too far
5013 mutex_lock(&mddev->open_mutex);
5016 error = kobject_init_and_add(&mddev->kobj, &md_ktype,
5017 &disk_to_dev(disk)->kobj, "%s", "md");
5019 /* This isn't possible, but as kobject_init_and_add is marked
5020 * __must_check, we must do something with the result
5022 printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
5026 if (mddev->kobj.sd &&
5027 sysfs_create_group(&mddev->kobj, &md_bitmap_group))
5028 printk(KERN_DEBUG "pointless warning\n");
5029 mutex_unlock(&mddev->open_mutex);
5031 mutex_unlock(&disks_mutex);
5032 if (!error && mddev->kobj.sd) {
5033 kobject_uevent(&mddev->kobj, KOBJ_ADD);
5034 mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state");
5040 static struct kobject *md_probe(dev_t dev, int *part, void *data)
5042 md_alloc(dev, NULL);
5046 static int add_named_array(const char *val, struct kernel_param *kp)
5048 /* val must be "md_*" where * is not all digits.
5049 * We allocate an array with a large free minor number, and
5050 * set the name to val. val must not already be an active name.
5052 int len = strlen(val);
5053 char buf[DISK_NAME_LEN];
5055 while (len && val[len-1] == '\n')
5057 if (len >= DISK_NAME_LEN)
5059 strlcpy(buf, val, len+1);
5060 if (strncmp(buf, "md_", 3) != 0)
5062 return md_alloc(0, buf);
5065 static void md_safemode_timeout(unsigned long data)
5067 struct mddev *mddev = (struct mddev *) data;
5069 if (!atomic_read(&mddev->writes_pending)) {
5070 mddev->safemode = 1;
5071 if (mddev->external)
5072 sysfs_notify_dirent_safe(mddev->sysfs_state);
5074 md_wakeup_thread(mddev->thread);
5077 static int start_dirty_degraded;
5079 int md_run(struct mddev *mddev)
5082 struct md_rdev *rdev;
5083 struct md_personality *pers;
5085 if (list_empty(&mddev->disks))
5086 /* cannot run an array with no devices.. */
5091 /* Cannot run until previous stop completes properly */
5092 if (mddev->sysfs_active)
5096 * Analyze all RAID superblock(s)
5098 if (!mddev->raid_disks) {
5099 if (!mddev->persistent)
5104 if (mddev->level != LEVEL_NONE)
5105 request_module("md-level-%d", mddev->level);
5106 else if (mddev->clevel[0])
5107 request_module("md-%s", mddev->clevel);
5110 * Drop all container device buffers, from now on
5111 * the only valid external interface is through the md
5114 rdev_for_each(rdev, mddev) {
5115 if (test_bit(Faulty, &rdev->flags))
5117 sync_blockdev(rdev->bdev);
5118 invalidate_bdev(rdev->bdev);
5120 /* perform some consistency tests on the device.
5121 * We don't want the data to overlap the metadata,
5122 * Internal Bitmap issues have been handled elsewhere.
5124 if (rdev->meta_bdev) {
5125 /* Nothing to check */;
5126 } else if (rdev->data_offset < rdev->sb_start) {
5127 if (mddev->dev_sectors &&
5128 rdev->data_offset + mddev->dev_sectors
5130 printk("md: %s: data overlaps metadata\n",
5135 if (rdev->sb_start + rdev->sb_size/512
5136 > rdev->data_offset) {
5137 printk("md: %s: metadata overlaps data\n",
5142 sysfs_notify_dirent_safe(rdev->sysfs_state);
5145 if (mddev->bio_set == NULL)
5146 mddev->bio_set = bioset_create(BIO_POOL_SIZE, 0);
5148 spin_lock(&pers_lock);
5149 pers = find_pers(mddev->level, mddev->clevel);
5150 if (!pers || !try_module_get(pers->owner)) {
5151 spin_unlock(&pers_lock);
5152 if (mddev->level != LEVEL_NONE)
5153 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
5156 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
5160 spin_unlock(&pers_lock);
5161 if (mddev->level != pers->level) {
5162 mddev->level = pers->level;
5163 mddev->new_level = pers->level;
5165 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
5167 if (mddev->reshape_position != MaxSector &&
5168 pers->start_reshape == NULL) {
5169 /* This personality cannot handle reshaping... */
5170 module_put(pers->owner);
5174 if (pers->sync_request) {
5175 /* Warn if this is a potentially silly
5178 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
5179 struct md_rdev *rdev2;
5182 rdev_for_each(rdev, mddev)
5183 rdev_for_each(rdev2, mddev) {
5185 rdev->bdev->bd_contains ==
5186 rdev2->bdev->bd_contains) {
5188 "%s: WARNING: %s appears to be"
5189 " on the same physical disk as"
5192 bdevname(rdev->bdev,b),
5193 bdevname(rdev2->bdev,b2));
5200 "True protection against single-disk"
5201 " failure might be compromised.\n");
5204 mddev->recovery = 0;
5205 /* may be over-ridden by personality */
5206 mddev->resync_max_sectors = mddev->dev_sectors;
5208 mddev->ok_start_degraded = start_dirty_degraded;
5210 if (start_readonly && mddev->ro == 0)
5211 mddev->ro = 2; /* read-only, but switch on first write */
5213 err = pers->run(mddev);
5215 printk(KERN_ERR "md: pers->run() failed ...\n");
5216 else if (pers->size(mddev, 0, 0) < mddev->array_sectors) {
5217 WARN_ONCE(!mddev->external_size, "%s: default size too small,"
5218 " but 'external_size' not in effect?\n", __func__);
5220 "md: invalid array_size %llu > default size %llu\n",
5221 (unsigned long long)mddev->array_sectors / 2,
5222 (unsigned long long)pers->size(mddev, 0, 0) / 2);
5225 if (err == 0 && pers->sync_request &&
5226 (mddev->bitmap_info.file || mddev->bitmap_info.offset)) {
5227 struct bitmap *bitmap;
5229 bitmap = bitmap_create(mddev, -1);
5230 if (IS_ERR(bitmap)) {
5231 err = PTR_ERR(bitmap);
5232 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
5233 mdname(mddev), err);
5235 mddev->bitmap = bitmap;
5239 mddev_detach(mddev);
5241 pers->free(mddev, mddev->private);
5242 mddev->private = NULL;
5243 module_put(pers->owner);
5244 bitmap_destroy(mddev);
5248 mddev->queue->backing_dev_info.congested_data = mddev;
5249 mddev->queue->backing_dev_info.congested_fn = md_congested;
5251 if (pers->sync_request) {
5252 if (mddev->kobj.sd &&
5253 sysfs_create_group(&mddev->kobj, &md_redundancy_group))
5255 "md: cannot register extra attributes for %s\n",
5257 mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action");
5258 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
5261 atomic_set(&mddev->writes_pending,0);
5262 atomic_set(&mddev->max_corr_read_errors,
5263 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS);
5264 mddev->safemode = 0;
5265 if (mddev_is_clustered(mddev))
5266 mddev->safemode_delay = 0;
5268 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
5271 spin_lock(&mddev->lock);
5274 spin_unlock(&mddev->lock);
5275 rdev_for_each(rdev, mddev)
5276 if (rdev->raid_disk >= 0)
5277 if (sysfs_link_rdev(mddev, rdev))
5278 /* failure here is OK */;
5280 if (mddev->degraded && !mddev->ro)
5281 /* This ensures that recovering status is reported immediately
5282 * via sysfs - until a lack of spares is confirmed.
5284 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
5285 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5287 if (mddev->flags & MD_UPDATE_SB_FLAGS)
5288 md_update_sb(mddev, 0);
5290 md_new_event(mddev);
5291 sysfs_notify_dirent_safe(mddev->sysfs_state);
5292 sysfs_notify_dirent_safe(mddev->sysfs_action);
5293 sysfs_notify(&mddev->kobj, NULL, "degraded");
5296 EXPORT_SYMBOL_GPL(md_run);
5298 static int do_md_run(struct mddev *mddev)
5302 err = md_run(mddev);
5305 err = bitmap_load(mddev);
5307 bitmap_destroy(mddev);
5311 if (mddev_is_clustered(mddev))
5312 md_allow_write(mddev);
5314 md_wakeup_thread(mddev->thread);
5315 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
5317 set_capacity(mddev->gendisk, mddev->array_sectors);
5318 revalidate_disk(mddev->gendisk);
5320 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
5325 static int restart_array(struct mddev *mddev)
5327 struct gendisk *disk = mddev->gendisk;
5329 /* Complain if it has no devices */
5330 if (list_empty(&mddev->disks))
5336 mddev->safemode = 0;
5338 set_disk_ro(disk, 0);
5339 printk(KERN_INFO "md: %s switched to read-write mode.\n",
5341 /* Kick recovery or resync if necessary */
5342 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5343 md_wakeup_thread(mddev->thread);
5344 md_wakeup_thread(mddev->sync_thread);
5345 sysfs_notify_dirent_safe(mddev->sysfs_state);
5349 static void md_clean(struct mddev *mddev)
5351 mddev->array_sectors = 0;
5352 mddev->external_size = 0;
5353 mddev->dev_sectors = 0;
5354 mddev->raid_disks = 0;
5355 mddev->recovery_cp = 0;
5356 mddev->resync_min = 0;
5357 mddev->resync_max = MaxSector;
5358 mddev->reshape_position = MaxSector;
5359 mddev->external = 0;
5360 mddev->persistent = 0;
5361 mddev->level = LEVEL_NONE;
5362 mddev->clevel[0] = 0;
5365 mddev->metadata_type[0] = 0;
5366 mddev->chunk_sectors = 0;
5367 mddev->ctime = mddev->utime = 0;
5369 mddev->max_disks = 0;
5371 mddev->can_decrease_events = 0;
5372 mddev->delta_disks = 0;
5373 mddev->reshape_backwards = 0;
5374 mddev->new_level = LEVEL_NONE;
5375 mddev->new_layout = 0;
5376 mddev->new_chunk_sectors = 0;
5377 mddev->curr_resync = 0;
5378 atomic64_set(&mddev->resync_mismatches, 0);
5379 mddev->suspend_lo = mddev->suspend_hi = 0;
5380 mddev->sync_speed_min = mddev->sync_speed_max = 0;
5381 mddev->recovery = 0;
5384 mddev->degraded = 0;
5385 mddev->safemode = 0;
5386 mddev->private = NULL;
5387 mddev->bitmap_info.offset = 0;
5388 mddev->bitmap_info.default_offset = 0;
5389 mddev->bitmap_info.default_space = 0;
5390 mddev->bitmap_info.chunksize = 0;
5391 mddev->bitmap_info.daemon_sleep = 0;
5392 mddev->bitmap_info.max_write_behind = 0;
5395 static void __md_stop_writes(struct mddev *mddev)
5397 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5398 flush_workqueue(md_misc_wq);
5399 if (mddev->sync_thread) {
5400 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5401 md_reap_sync_thread(mddev);
5404 del_timer_sync(&mddev->safemode_timer);
5406 bitmap_flush(mddev);
5407 md_super_wait(mddev);
5409 if (mddev->ro == 0 &&
5410 ((!mddev->in_sync && !mddev_is_clustered(mddev)) ||
5411 (mddev->flags & MD_UPDATE_SB_FLAGS))) {
5412 /* mark array as shutdown cleanly */
5413 if (!mddev_is_clustered(mddev))
5415 md_update_sb(mddev, 1);
5419 void md_stop_writes(struct mddev *mddev)
5421 mddev_lock_nointr(mddev);
5422 __md_stop_writes(mddev);
5423 mddev_unlock(mddev);
5425 EXPORT_SYMBOL_GPL(md_stop_writes);
5427 static void mddev_detach(struct mddev *mddev)
5429 struct bitmap *bitmap = mddev->bitmap;
5430 /* wait for behind writes to complete */
5431 if (bitmap && atomic_read(&bitmap->behind_writes) > 0) {
5432 printk(KERN_INFO "md:%s: behind writes in progress - waiting to stop.\n",
5434 /* need to kick something here to make sure I/O goes? */
5435 wait_event(bitmap->behind_wait,
5436 atomic_read(&bitmap->behind_writes) == 0);
5438 if (mddev->pers && mddev->pers->quiesce) {
5439 mddev->pers->quiesce(mddev, 1);
5440 mddev->pers->quiesce(mddev, 0);
5442 md_unregister_thread(&mddev->thread);
5444 blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/
5447 static void __md_stop(struct mddev *mddev)
5449 struct md_personality *pers = mddev->pers;
5450 mddev_detach(mddev);
5451 /* Ensure ->event_work is done */
5452 flush_workqueue(md_misc_wq);
5453 spin_lock(&mddev->lock);
5456 spin_unlock(&mddev->lock);
5457 pers->free(mddev, mddev->private);
5458 mddev->private = NULL;
5459 if (pers->sync_request && mddev->to_remove == NULL)
5460 mddev->to_remove = &md_redundancy_group;
5461 module_put(pers->owner);
5462 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5465 void md_stop(struct mddev *mddev)
5467 /* stop the array and free an attached data structures.
5468 * This is called from dm-raid
5471 bitmap_destroy(mddev);
5473 bioset_free(mddev->bio_set);
5476 EXPORT_SYMBOL_GPL(md_stop);
5478 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev)
5483 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
5485 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5486 md_wakeup_thread(mddev->thread);
5488 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5489 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5490 if (mddev->sync_thread)
5491 /* Thread might be blocked waiting for metadata update
5492 * which will now never happen */
5493 wake_up_process(mddev->sync_thread->tsk);
5495 if (mddev->external && test_bit(MD_CHANGE_PENDING, &mddev->flags))
5497 mddev_unlock(mddev);
5498 wait_event(resync_wait, !test_bit(MD_RECOVERY_RUNNING,
5500 wait_event(mddev->sb_wait,
5501 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
5502 mddev_lock_nointr(mddev);
5504 mutex_lock(&mddev->open_mutex);
5505 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
5506 mddev->sync_thread ||
5507 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
5508 (bdev && !test_bit(MD_STILL_CLOSED, &mddev->flags))) {
5509 printk("md: %s still in use.\n",mdname(mddev));
5511 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5512 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5513 md_wakeup_thread(mddev->thread);
5519 __md_stop_writes(mddev);
5525 set_disk_ro(mddev->gendisk, 1);
5526 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5527 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5528 md_wakeup_thread(mddev->thread);
5529 sysfs_notify_dirent_safe(mddev->sysfs_state);
5533 mutex_unlock(&mddev->open_mutex);
5538 * 0 - completely stop and dis-assemble array
5539 * 2 - stop but do not disassemble array
5541 static int do_md_stop(struct mddev *mddev, int mode,
5542 struct block_device *bdev)
5544 struct gendisk *disk = mddev->gendisk;
5545 struct md_rdev *rdev;
5548 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
5550 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5551 md_wakeup_thread(mddev->thread);
5553 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5554 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5555 if (mddev->sync_thread)
5556 /* Thread might be blocked waiting for metadata update
5557 * which will now never happen */
5558 wake_up_process(mddev->sync_thread->tsk);
5560 mddev_unlock(mddev);
5561 wait_event(resync_wait, (mddev->sync_thread == NULL &&
5562 !test_bit(MD_RECOVERY_RUNNING,
5563 &mddev->recovery)));
5564 mddev_lock_nointr(mddev);
5566 mutex_lock(&mddev->open_mutex);
5567 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
5568 mddev->sysfs_active ||
5569 mddev->sync_thread ||
5570 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
5571 (bdev && !test_bit(MD_STILL_CLOSED, &mddev->flags))) {
5572 printk("md: %s still in use.\n",mdname(mddev));
5573 mutex_unlock(&mddev->open_mutex);
5575 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5576 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5577 md_wakeup_thread(mddev->thread);
5583 set_disk_ro(disk, 0);
5585 __md_stop_writes(mddev);
5587 mddev->queue->backing_dev_info.congested_fn = NULL;
5589 /* tell userspace to handle 'inactive' */
5590 sysfs_notify_dirent_safe(mddev->sysfs_state);
5592 rdev_for_each(rdev, mddev)
5593 if (rdev->raid_disk >= 0)
5594 sysfs_unlink_rdev(mddev, rdev);
5596 set_capacity(disk, 0);
5597 mutex_unlock(&mddev->open_mutex);
5599 revalidate_disk(disk);
5604 mutex_unlock(&mddev->open_mutex);
5606 * Free resources if final stop
5609 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
5611 bitmap_destroy(mddev);
5612 if (mddev->bitmap_info.file) {
5613 struct file *f = mddev->bitmap_info.file;
5614 spin_lock(&mddev->lock);
5615 mddev->bitmap_info.file = NULL;
5616 spin_unlock(&mddev->lock);
5619 mddev->bitmap_info.offset = 0;
5621 export_array(mddev);
5624 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
5625 if (mddev->hold_active == UNTIL_STOP)
5626 mddev->hold_active = 0;
5628 blk_integrity_unregister(disk);
5629 md_new_event(mddev);
5630 sysfs_notify_dirent_safe(mddev->sysfs_state);
5635 static void autorun_array(struct mddev *mddev)
5637 struct md_rdev *rdev;
5640 if (list_empty(&mddev->disks))
5643 printk(KERN_INFO "md: running: ");
5645 rdev_for_each(rdev, mddev) {
5646 char b[BDEVNAME_SIZE];
5647 printk("<%s>", bdevname(rdev->bdev,b));
5651 err = do_md_run(mddev);
5653 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
5654 do_md_stop(mddev, 0, NULL);
5659 * lets try to run arrays based on all disks that have arrived
5660 * until now. (those are in pending_raid_disks)
5662 * the method: pick the first pending disk, collect all disks with
5663 * the same UUID, remove all from the pending list and put them into
5664 * the 'same_array' list. Then order this list based on superblock
5665 * update time (freshest comes first), kick out 'old' disks and
5666 * compare superblocks. If everything's fine then run it.
5668 * If "unit" is allocated, then bump its reference count
5670 static void autorun_devices(int part)
5672 struct md_rdev *rdev0, *rdev, *tmp;
5673 struct mddev *mddev;
5674 char b[BDEVNAME_SIZE];
5676 printk(KERN_INFO "md: autorun ...\n");
5677 while (!list_empty(&pending_raid_disks)) {
5680 LIST_HEAD(candidates);
5681 rdev0 = list_entry(pending_raid_disks.next,
5682 struct md_rdev, same_set);
5684 printk(KERN_INFO "md: considering %s ...\n",
5685 bdevname(rdev0->bdev,b));
5686 INIT_LIST_HEAD(&candidates);
5687 rdev_for_each_list(rdev, tmp, &pending_raid_disks)
5688 if (super_90_load(rdev, rdev0, 0) >= 0) {
5689 printk(KERN_INFO "md: adding %s ...\n",
5690 bdevname(rdev->bdev,b));
5691 list_move(&rdev->same_set, &candidates);
5694 * now we have a set of devices, with all of them having
5695 * mostly sane superblocks. It's time to allocate the
5699 dev = MKDEV(mdp_major,
5700 rdev0->preferred_minor << MdpMinorShift);
5701 unit = MINOR(dev) >> MdpMinorShift;
5703 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
5706 if (rdev0->preferred_minor != unit) {
5707 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
5708 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
5712 md_probe(dev, NULL, NULL);
5713 mddev = mddev_find(dev);
5714 if (!mddev || !mddev->gendisk) {
5718 "md: cannot allocate memory for md drive.\n");
5721 if (mddev_lock(mddev))
5722 printk(KERN_WARNING "md: %s locked, cannot run\n",
5724 else if (mddev->raid_disks || mddev->major_version
5725 || !list_empty(&mddev->disks)) {
5727 "md: %s already running, cannot run %s\n",
5728 mdname(mddev), bdevname(rdev0->bdev,b));
5729 mddev_unlock(mddev);
5731 printk(KERN_INFO "md: created %s\n", mdname(mddev));
5732 mddev->persistent = 1;
5733 rdev_for_each_list(rdev, tmp, &candidates) {
5734 list_del_init(&rdev->same_set);
5735 if (bind_rdev_to_array(rdev, mddev))
5738 autorun_array(mddev);
5739 mddev_unlock(mddev);
5741 /* on success, candidates will be empty, on error
5744 rdev_for_each_list(rdev, tmp, &candidates) {
5745 list_del_init(&rdev->same_set);
5750 printk(KERN_INFO "md: ... autorun DONE.\n");
5752 #endif /* !MODULE */
5754 static int get_version(void __user *arg)
5758 ver.major = MD_MAJOR_VERSION;
5759 ver.minor = MD_MINOR_VERSION;
5760 ver.patchlevel = MD_PATCHLEVEL_VERSION;
5762 if (copy_to_user(arg, &ver, sizeof(ver)))
5768 static int get_array_info(struct mddev *mddev, void __user *arg)
5770 mdu_array_info_t info;
5771 int nr,working,insync,failed,spare;
5772 struct md_rdev *rdev;
5774 nr = working = insync = failed = spare = 0;
5776 rdev_for_each_rcu(rdev, mddev) {
5778 if (test_bit(Faulty, &rdev->flags))
5782 if (test_bit(In_sync, &rdev->flags))
5790 info.major_version = mddev->major_version;
5791 info.minor_version = mddev->minor_version;
5792 info.patch_version = MD_PATCHLEVEL_VERSION;
5793 info.ctime = mddev->ctime;
5794 info.level = mddev->level;
5795 info.size = mddev->dev_sectors / 2;
5796 if (info.size != mddev->dev_sectors / 2) /* overflow */
5799 info.raid_disks = mddev->raid_disks;
5800 info.md_minor = mddev->md_minor;
5801 info.not_persistent= !mddev->persistent;
5803 info.utime = mddev->utime;
5806 info.state = (1<<MD_SB_CLEAN);
5807 if (mddev->bitmap && mddev->bitmap_info.offset)
5808 info.state |= (1<<MD_SB_BITMAP_PRESENT);
5809 if (mddev_is_clustered(mddev))
5810 info.state |= (1<<MD_SB_CLUSTERED);
5811 info.active_disks = insync;
5812 info.working_disks = working;
5813 info.failed_disks = failed;
5814 info.spare_disks = spare;
5816 info.layout = mddev->layout;
5817 info.chunk_size = mddev->chunk_sectors << 9;
5819 if (copy_to_user(arg, &info, sizeof(info)))
5825 static int get_bitmap_file(struct mddev *mddev, void __user * arg)
5827 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
5831 file = kzalloc(sizeof(*file), GFP_NOIO);
5836 spin_lock(&mddev->lock);
5837 /* bitmap enabled */
5838 if (mddev->bitmap_info.file) {
5839 ptr = file_path(mddev->bitmap_info.file, file->pathname,
5840 sizeof(file->pathname));
5844 memmove(file->pathname, ptr,
5845 sizeof(file->pathname)-(ptr-file->pathname));
5847 spin_unlock(&mddev->lock);
5850 copy_to_user(arg, file, sizeof(*file)))
5857 static int get_disk_info(struct mddev *mddev, void __user * arg)
5859 mdu_disk_info_t info;
5860 struct md_rdev *rdev;
5862 if (copy_from_user(&info, arg, sizeof(info)))
5866 rdev = md_find_rdev_nr_rcu(mddev, info.number);
5868 info.major = MAJOR(rdev->bdev->bd_dev);
5869 info.minor = MINOR(rdev->bdev->bd_dev);
5870 info.raid_disk = rdev->raid_disk;
5872 if (test_bit(Faulty, &rdev->flags))
5873 info.state |= (1<<MD_DISK_FAULTY);
5874 else if (test_bit(In_sync, &rdev->flags)) {
5875 info.state |= (1<<MD_DISK_ACTIVE);
5876 info.state |= (1<<MD_DISK_SYNC);
5878 if (test_bit(Journal, &rdev->flags))
5879 info.state |= (1<<MD_DISK_JOURNAL);
5880 if (test_bit(WriteMostly, &rdev->flags))
5881 info.state |= (1<<MD_DISK_WRITEMOSTLY);
5883 info.major = info.minor = 0;
5884 info.raid_disk = -1;
5885 info.state = (1<<MD_DISK_REMOVED);
5889 if (copy_to_user(arg, &info, sizeof(info)))
5895 static int add_new_disk(struct mddev *mddev, mdu_disk_info_t *info)
5897 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
5898 struct md_rdev *rdev;
5899 dev_t dev = MKDEV(info->major,info->minor);
5901 if (mddev_is_clustered(mddev) &&
5902 !(info->state & ((1 << MD_DISK_CLUSTER_ADD) | (1 << MD_DISK_CANDIDATE)))) {
5903 pr_err("%s: Cannot add to clustered mddev.\n",
5908 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
5911 if (!mddev->raid_disks) {
5913 /* expecting a device which has a superblock */
5914 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
5917 "md: md_import_device returned %ld\n",
5919 return PTR_ERR(rdev);
5921 if (!list_empty(&mddev->disks)) {
5922 struct md_rdev *rdev0
5923 = list_entry(mddev->disks.next,
5924 struct md_rdev, same_set);
5925 err = super_types[mddev->major_version]
5926 .load_super(rdev, rdev0, mddev->minor_version);
5929 "md: %s has different UUID to %s\n",
5930 bdevname(rdev->bdev,b),
5931 bdevname(rdev0->bdev,b2));
5936 err = bind_rdev_to_array(rdev, mddev);
5943 * add_new_disk can be used once the array is assembled
5944 * to add "hot spares". They must already have a superblock
5949 if (!mddev->pers->hot_add_disk) {
5951 "%s: personality does not support diskops!\n",
5955 if (mddev->persistent)
5956 rdev = md_import_device(dev, mddev->major_version,
5957 mddev->minor_version);
5959 rdev = md_import_device(dev, -1, -1);
5962 "md: md_import_device returned %ld\n",
5964 return PTR_ERR(rdev);
5966 /* set saved_raid_disk if appropriate */
5967 if (!mddev->persistent) {
5968 if (info->state & (1<<MD_DISK_SYNC) &&
5969 info->raid_disk < mddev->raid_disks) {
5970 rdev->raid_disk = info->raid_disk;
5971 set_bit(In_sync, &rdev->flags);
5972 clear_bit(Bitmap_sync, &rdev->flags);
5974 rdev->raid_disk = -1;
5975 rdev->saved_raid_disk = rdev->raid_disk;
5977 super_types[mddev->major_version].
5978 validate_super(mddev, rdev);
5979 if ((info->state & (1<<MD_DISK_SYNC)) &&
5980 rdev->raid_disk != info->raid_disk) {
5981 /* This was a hot-add request, but events doesn't
5982 * match, so reject it.
5988 clear_bit(In_sync, &rdev->flags); /* just to be sure */
5989 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
5990 set_bit(WriteMostly, &rdev->flags);
5992 clear_bit(WriteMostly, &rdev->flags);
5994 if (info->state & (1<<MD_DISK_JOURNAL))
5995 set_bit(Journal, &rdev->flags);
5997 * check whether the device shows up in other nodes
5999 if (mddev_is_clustered(mddev)) {
6000 if (info->state & (1 << MD_DISK_CANDIDATE))
6001 set_bit(Candidate, &rdev->flags);
6002 else if (info->state & (1 << MD_DISK_CLUSTER_ADD)) {
6003 /* --add initiated by this node */
6004 err = md_cluster_ops->add_new_disk(mddev, rdev);
6012 rdev->raid_disk = -1;
6013 err = bind_rdev_to_array(rdev, mddev);
6018 if (mddev_is_clustered(mddev)) {
6019 if (info->state & (1 << MD_DISK_CANDIDATE))
6020 md_cluster_ops->new_disk_ack(mddev, (err == 0));
6023 md_cluster_ops->add_new_disk_cancel(mddev);
6025 err = add_bound_rdev(rdev);
6029 err = add_bound_rdev(rdev);
6034 /* otherwise, add_new_disk is only allowed
6035 * for major_version==0 superblocks
6037 if (mddev->major_version != 0) {
6038 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
6043 if (!(info->state & (1<<MD_DISK_FAULTY))) {
6045 rdev = md_import_device(dev, -1, 0);
6048 "md: error, md_import_device() returned %ld\n",
6050 return PTR_ERR(rdev);
6052 rdev->desc_nr = info->number;
6053 if (info->raid_disk < mddev->raid_disks)
6054 rdev->raid_disk = info->raid_disk;
6056 rdev->raid_disk = -1;
6058 if (rdev->raid_disk < mddev->raid_disks)
6059 if (info->state & (1<<MD_DISK_SYNC))
6060 set_bit(In_sync, &rdev->flags);
6062 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
6063 set_bit(WriteMostly, &rdev->flags);
6065 if (!mddev->persistent) {
6066 printk(KERN_INFO "md: nonpersistent superblock ...\n");
6067 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
6069 rdev->sb_start = calc_dev_sboffset(rdev);
6070 rdev->sectors = rdev->sb_start;
6072 err = bind_rdev_to_array(rdev, mddev);
6082 static int hot_remove_disk(struct mddev *mddev, dev_t dev)
6084 char b[BDEVNAME_SIZE];
6085 struct md_rdev *rdev;
6088 rdev = find_rdev(mddev, dev);
6092 if (mddev_is_clustered(mddev))
6093 ret = md_cluster_ops->metadata_update_start(mddev);
6095 if (rdev->raid_disk < 0)
6098 clear_bit(Blocked, &rdev->flags);
6099 remove_and_add_spares(mddev, rdev);
6101 if (rdev->raid_disk >= 0)
6105 if (mddev_is_clustered(mddev) && ret == 0)
6106 md_cluster_ops->remove_disk(mddev, rdev);
6108 md_kick_rdev_from_array(rdev);
6109 md_update_sb(mddev, 1);
6110 md_new_event(mddev);
6114 if (mddev_is_clustered(mddev) && ret == 0)
6115 md_cluster_ops->metadata_update_cancel(mddev);
6117 printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n",
6118 bdevname(rdev->bdev,b), mdname(mddev));
6122 static int hot_add_disk(struct mddev *mddev, dev_t dev)
6124 char b[BDEVNAME_SIZE];
6126 struct md_rdev *rdev;
6131 if (mddev->major_version != 0) {
6132 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
6133 " version-0 superblocks.\n",
6137 if (!mddev->pers->hot_add_disk) {
6139 "%s: personality does not support diskops!\n",
6144 rdev = md_import_device(dev, -1, 0);
6147 "md: error, md_import_device() returned %ld\n",
6152 if (mddev->persistent)
6153 rdev->sb_start = calc_dev_sboffset(rdev);
6155 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
6157 rdev->sectors = rdev->sb_start;
6159 if (test_bit(Faulty, &rdev->flags)) {
6161 "md: can not hot-add faulty %s disk to %s!\n",
6162 bdevname(rdev->bdev,b), mdname(mddev));
6167 clear_bit(In_sync, &rdev->flags);
6169 rdev->saved_raid_disk = -1;
6170 err = bind_rdev_to_array(rdev, mddev);
6175 * The rest should better be atomic, we can have disk failures
6176 * noticed in interrupt contexts ...
6179 rdev->raid_disk = -1;
6181 md_update_sb(mddev, 1);
6183 * Kick recovery, maybe this spare has to be added to the
6184 * array immediately.
6186 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6187 md_wakeup_thread(mddev->thread);
6188 md_new_event(mddev);
6196 static int set_bitmap_file(struct mddev *mddev, int fd)
6201 if (!mddev->pers->quiesce || !mddev->thread)
6203 if (mddev->recovery || mddev->sync_thread)
6205 /* we should be able to change the bitmap.. */
6209 struct inode *inode;
6212 if (mddev->bitmap || mddev->bitmap_info.file)
6213 return -EEXIST; /* cannot add when bitmap is present */
6217 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
6222 inode = f->f_mapping->host;
6223 if (!S_ISREG(inode->i_mode)) {
6224 printk(KERN_ERR "%s: error: bitmap file must be a regular file\n",
6227 } else if (!(f->f_mode & FMODE_WRITE)) {
6228 printk(KERN_ERR "%s: error: bitmap file must open for write\n",
6231 } else if (atomic_read(&inode->i_writecount) != 1) {
6232 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
6240 mddev->bitmap_info.file = f;
6241 mddev->bitmap_info.offset = 0; /* file overrides offset */
6242 } else if (mddev->bitmap == NULL)
6243 return -ENOENT; /* cannot remove what isn't there */
6246 mddev->pers->quiesce(mddev, 1);
6248 struct bitmap *bitmap;
6250 bitmap = bitmap_create(mddev, -1);
6251 if (!IS_ERR(bitmap)) {
6252 mddev->bitmap = bitmap;
6253 err = bitmap_load(mddev);
6255 err = PTR_ERR(bitmap);
6257 if (fd < 0 || err) {
6258 bitmap_destroy(mddev);
6259 fd = -1; /* make sure to put the file */
6261 mddev->pers->quiesce(mddev, 0);
6264 struct file *f = mddev->bitmap_info.file;
6266 spin_lock(&mddev->lock);
6267 mddev->bitmap_info.file = NULL;
6268 spin_unlock(&mddev->lock);
6277 * set_array_info is used two different ways
6278 * The original usage is when creating a new array.
6279 * In this usage, raid_disks is > 0 and it together with
6280 * level, size, not_persistent,layout,chunksize determine the
6281 * shape of the array.
6282 * This will always create an array with a type-0.90.0 superblock.
6283 * The newer usage is when assembling an array.
6284 * In this case raid_disks will be 0, and the major_version field is
6285 * use to determine which style super-blocks are to be found on the devices.
6286 * The minor and patch _version numbers are also kept incase the
6287 * super_block handler wishes to interpret them.
6289 static int set_array_info(struct mddev *mddev, mdu_array_info_t *info)
6292 if (info->raid_disks == 0) {
6293 /* just setting version number for superblock loading */
6294 if (info->major_version < 0 ||
6295 info->major_version >= ARRAY_SIZE(super_types) ||
6296 super_types[info->major_version].name == NULL) {
6297 /* maybe try to auto-load a module? */
6299 "md: superblock version %d not known\n",
6300 info->major_version);
6303 mddev->major_version = info->major_version;
6304 mddev->minor_version = info->minor_version;
6305 mddev->patch_version = info->patch_version;
6306 mddev->persistent = !info->not_persistent;
6307 /* ensure mddev_put doesn't delete this now that there
6308 * is some minimal configuration.
6310 mddev->ctime = get_seconds();
6313 mddev->major_version = MD_MAJOR_VERSION;
6314 mddev->minor_version = MD_MINOR_VERSION;
6315 mddev->patch_version = MD_PATCHLEVEL_VERSION;
6316 mddev->ctime = get_seconds();
6318 mddev->level = info->level;
6319 mddev->clevel[0] = 0;
6320 mddev->dev_sectors = 2 * (sector_t)info->size;
6321 mddev->raid_disks = info->raid_disks;
6322 /* don't set md_minor, it is determined by which /dev/md* was
6325 if (info->state & (1<<MD_SB_CLEAN))
6326 mddev->recovery_cp = MaxSector;
6328 mddev->recovery_cp = 0;
6329 mddev->persistent = ! info->not_persistent;
6330 mddev->external = 0;
6332 mddev->layout = info->layout;
6333 mddev->chunk_sectors = info->chunk_size >> 9;
6335 mddev->max_disks = MD_SB_DISKS;
6337 if (mddev->persistent)
6339 set_bit(MD_CHANGE_DEVS, &mddev->flags);
6341 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
6342 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
6343 mddev->bitmap_info.offset = 0;
6345 mddev->reshape_position = MaxSector;
6348 * Generate a 128 bit UUID
6350 get_random_bytes(mddev->uuid, 16);
6352 mddev->new_level = mddev->level;
6353 mddev->new_chunk_sectors = mddev->chunk_sectors;
6354 mddev->new_layout = mddev->layout;
6355 mddev->delta_disks = 0;
6356 mddev->reshape_backwards = 0;
6361 void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors)
6363 WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__);
6365 if (mddev->external_size)
6368 mddev->array_sectors = array_sectors;
6370 EXPORT_SYMBOL(md_set_array_sectors);
6372 static int update_size(struct mddev *mddev, sector_t num_sectors)
6374 struct md_rdev *rdev;
6376 int fit = (num_sectors == 0);
6378 if (mddev->pers->resize == NULL)
6380 /* The "num_sectors" is the number of sectors of each device that
6381 * is used. This can only make sense for arrays with redundancy.
6382 * linear and raid0 always use whatever space is available. We can only
6383 * consider changing this number if no resync or reconstruction is
6384 * happening, and if the new size is acceptable. It must fit before the
6385 * sb_start or, if that is <data_offset, it must fit before the size
6386 * of each device. If num_sectors is zero, we find the largest size
6389 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
6395 rdev_for_each(rdev, mddev) {
6396 sector_t avail = rdev->sectors;
6398 if (fit && (num_sectors == 0 || num_sectors > avail))
6399 num_sectors = avail;
6400 if (avail < num_sectors)
6403 rv = mddev->pers->resize(mddev, num_sectors);
6405 revalidate_disk(mddev->gendisk);
6409 static int update_raid_disks(struct mddev *mddev, int raid_disks)
6412 struct md_rdev *rdev;
6413 /* change the number of raid disks */
6414 if (mddev->pers->check_reshape == NULL)
6418 if (raid_disks <= 0 ||
6419 (mddev->max_disks && raid_disks >= mddev->max_disks))
6421 if (mddev->sync_thread ||
6422 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
6423 mddev->reshape_position != MaxSector)
6426 rdev_for_each(rdev, mddev) {
6427 if (mddev->raid_disks < raid_disks &&
6428 rdev->data_offset < rdev->new_data_offset)
6430 if (mddev->raid_disks > raid_disks &&
6431 rdev->data_offset > rdev->new_data_offset)
6435 mddev->delta_disks = raid_disks - mddev->raid_disks;
6436 if (mddev->delta_disks < 0)
6437 mddev->reshape_backwards = 1;
6438 else if (mddev->delta_disks > 0)
6439 mddev->reshape_backwards = 0;
6441 rv = mddev->pers->check_reshape(mddev);
6443 mddev->delta_disks = 0;
6444 mddev->reshape_backwards = 0;
6450 * update_array_info is used to change the configuration of an
6452 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
6453 * fields in the info are checked against the array.
6454 * Any differences that cannot be handled will cause an error.
6455 * Normally, only one change can be managed at a time.
6457 static int update_array_info(struct mddev *mddev, mdu_array_info_t *info)
6463 /* calculate expected state,ignoring low bits */
6464 if (mddev->bitmap && mddev->bitmap_info.offset)
6465 state |= (1 << MD_SB_BITMAP_PRESENT);
6467 if (mddev->major_version != info->major_version ||
6468 mddev->minor_version != info->minor_version ||
6469 /* mddev->patch_version != info->patch_version || */
6470 mddev->ctime != info->ctime ||
6471 mddev->level != info->level ||
6472 /* mddev->layout != info->layout || */
6473 mddev->persistent != !info->not_persistent ||
6474 mddev->chunk_sectors != info->chunk_size >> 9 ||
6475 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
6476 ((state^info->state) & 0xfffffe00)
6479 /* Check there is only one change */
6480 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
6482 if (mddev->raid_disks != info->raid_disks)
6484 if (mddev->layout != info->layout)
6486 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT))
6493 if (mddev->layout != info->layout) {
6495 * we don't need to do anything at the md level, the
6496 * personality will take care of it all.
6498 if (mddev->pers->check_reshape == NULL)
6501 mddev->new_layout = info->layout;
6502 rv = mddev->pers->check_reshape(mddev);
6504 mddev->new_layout = mddev->layout;
6508 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
6509 rv = update_size(mddev, (sector_t)info->size * 2);
6511 if (mddev->raid_disks != info->raid_disks)
6512 rv = update_raid_disks(mddev, info->raid_disks);
6514 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
6515 if (mddev->pers->quiesce == NULL || mddev->thread == NULL) {
6519 if (mddev->recovery || mddev->sync_thread) {
6523 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
6524 struct bitmap *bitmap;
6525 /* add the bitmap */
6526 if (mddev->bitmap) {
6530 if (mddev->bitmap_info.default_offset == 0) {
6534 mddev->bitmap_info.offset =
6535 mddev->bitmap_info.default_offset;
6536 mddev->bitmap_info.space =
6537 mddev->bitmap_info.default_space;
6538 mddev->pers->quiesce(mddev, 1);
6539 bitmap = bitmap_create(mddev, -1);
6540 if (!IS_ERR(bitmap)) {
6541 mddev->bitmap = bitmap;
6542 rv = bitmap_load(mddev);
6544 rv = PTR_ERR(bitmap);
6546 bitmap_destroy(mddev);
6547 mddev->pers->quiesce(mddev, 0);
6549 /* remove the bitmap */
6550 if (!mddev->bitmap) {
6554 if (mddev->bitmap->storage.file) {
6558 mddev->pers->quiesce(mddev, 1);
6559 bitmap_destroy(mddev);
6560 mddev->pers->quiesce(mddev, 0);
6561 mddev->bitmap_info.offset = 0;
6564 md_update_sb(mddev, 1);
6570 static int set_disk_faulty(struct mddev *mddev, dev_t dev)
6572 struct md_rdev *rdev;
6575 if (mddev->pers == NULL)
6579 rdev = find_rdev_rcu(mddev, dev);
6583 md_error(mddev, rdev);
6584 if (!test_bit(Faulty, &rdev->flags))
6592 * We have a problem here : there is no easy way to give a CHS
6593 * virtual geometry. We currently pretend that we have a 2 heads
6594 * 4 sectors (with a BIG number of cylinders...). This drives
6595 * dosfs just mad... ;-)
6597 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
6599 struct mddev *mddev = bdev->bd_disk->private_data;
6603 geo->cylinders = mddev->array_sectors / 8;
6607 static inline bool md_ioctl_valid(unsigned int cmd)
6612 case GET_ARRAY_INFO:
6613 case GET_BITMAP_FILE:
6616 case HOT_REMOVE_DISK:
6619 case RESTART_ARRAY_RW:
6621 case SET_ARRAY_INFO:
6622 case SET_BITMAP_FILE:
6623 case SET_DISK_FAULTY:
6626 case CLUSTERED_DISK_NACK:
6633 static int md_ioctl(struct block_device *bdev, fmode_t mode,
6634 unsigned int cmd, unsigned long arg)
6637 void __user *argp = (void __user *)arg;
6638 struct mddev *mddev = NULL;
6641 if (!md_ioctl_valid(cmd))
6646 case GET_ARRAY_INFO:
6650 if (!capable(CAP_SYS_ADMIN))
6655 * Commands dealing with the RAID driver but not any
6660 err = get_version(argp);
6666 autostart_arrays(arg);
6673 * Commands creating/starting a new array:
6676 mddev = bdev->bd_disk->private_data;
6683 /* Some actions do not requires the mutex */
6685 case GET_ARRAY_INFO:
6686 if (!mddev->raid_disks && !mddev->external)
6689 err = get_array_info(mddev, argp);
6693 if (!mddev->raid_disks && !mddev->external)
6696 err = get_disk_info(mddev, argp);
6699 case SET_DISK_FAULTY:
6700 err = set_disk_faulty(mddev, new_decode_dev(arg));
6703 case GET_BITMAP_FILE:
6704 err = get_bitmap_file(mddev, argp);
6709 if (cmd == ADD_NEW_DISK)
6710 /* need to ensure md_delayed_delete() has completed */
6711 flush_workqueue(md_misc_wq);
6713 if (cmd == HOT_REMOVE_DISK)
6714 /* need to ensure recovery thread has run */
6715 wait_event_interruptible_timeout(mddev->sb_wait,
6716 !test_bit(MD_RECOVERY_NEEDED,
6718 msecs_to_jiffies(5000));
6719 if (cmd == STOP_ARRAY || cmd == STOP_ARRAY_RO) {
6720 /* Need to flush page cache, and ensure no-one else opens
6723 mutex_lock(&mddev->open_mutex);
6724 if (mddev->pers && atomic_read(&mddev->openers) > 1) {
6725 mutex_unlock(&mddev->open_mutex);
6729 set_bit(MD_STILL_CLOSED, &mddev->flags);
6730 mutex_unlock(&mddev->open_mutex);
6731 sync_blockdev(bdev);
6733 err = mddev_lock(mddev);
6736 "md: ioctl lock interrupted, reason %d, cmd %d\n",
6741 if (cmd == SET_ARRAY_INFO) {
6742 mdu_array_info_t info;
6744 memset(&info, 0, sizeof(info));
6745 else if (copy_from_user(&info, argp, sizeof(info))) {
6750 err = update_array_info(mddev, &info);
6752 printk(KERN_WARNING "md: couldn't update"
6753 " array info. %d\n", err);
6758 if (!list_empty(&mddev->disks)) {
6760 "md: array %s already has disks!\n",
6765 if (mddev->raid_disks) {
6767 "md: array %s already initialised!\n",
6772 err = set_array_info(mddev, &info);
6774 printk(KERN_WARNING "md: couldn't set"
6775 " array info. %d\n", err);
6782 * Commands querying/configuring an existing array:
6784 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
6785 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
6786 if ((!mddev->raid_disks && !mddev->external)
6787 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
6788 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
6789 && cmd != GET_BITMAP_FILE) {
6795 * Commands even a read-only array can execute:
6798 case RESTART_ARRAY_RW:
6799 err = restart_array(mddev);
6803 err = do_md_stop(mddev, 0, bdev);
6807 err = md_set_readonly(mddev, bdev);
6810 case HOT_REMOVE_DISK:
6811 err = hot_remove_disk(mddev, new_decode_dev(arg));
6815 /* We can support ADD_NEW_DISK on read-only arrays
6816 * on if we are re-adding a preexisting device.
6817 * So require mddev->pers and MD_DISK_SYNC.
6820 mdu_disk_info_t info;
6821 if (copy_from_user(&info, argp, sizeof(info)))
6823 else if (!(info.state & (1<<MD_DISK_SYNC)))
6824 /* Need to clear read-only for this */
6827 err = add_new_disk(mddev, &info);
6833 if (get_user(ro, (int __user *)(arg))) {
6839 /* if the bdev is going readonly the value of mddev->ro
6840 * does not matter, no writes are coming
6845 /* are we are already prepared for writes? */
6849 /* transitioning to readauto need only happen for
6850 * arrays that call md_write_start
6853 err = restart_array(mddev);
6856 set_disk_ro(mddev->gendisk, 0);
6863 * The remaining ioctls are changing the state of the
6864 * superblock, so we do not allow them on read-only arrays.
6866 if (mddev->ro && mddev->pers) {
6867 if (mddev->ro == 2) {
6869 sysfs_notify_dirent_safe(mddev->sysfs_state);
6870 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6871 /* mddev_unlock will wake thread */
6872 /* If a device failed while we were read-only, we
6873 * need to make sure the metadata is updated now.
6875 if (test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
6876 mddev_unlock(mddev);
6877 wait_event(mddev->sb_wait,
6878 !test_bit(MD_CHANGE_DEVS, &mddev->flags) &&
6879 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
6880 mddev_lock_nointr(mddev);
6891 mdu_disk_info_t info;
6892 if (copy_from_user(&info, argp, sizeof(info)))
6895 err = add_new_disk(mddev, &info);
6899 case CLUSTERED_DISK_NACK:
6900 if (mddev_is_clustered(mddev))
6901 md_cluster_ops->new_disk_ack(mddev, false);
6907 err = hot_add_disk(mddev, new_decode_dev(arg));
6911 err = do_md_run(mddev);
6914 case SET_BITMAP_FILE:
6915 err = set_bitmap_file(mddev, (int)arg);
6924 if (mddev->hold_active == UNTIL_IOCTL &&
6926 mddev->hold_active = 0;
6927 mddev_unlock(mddev);
6931 #ifdef CONFIG_COMPAT
6932 static int md_compat_ioctl(struct block_device *bdev, fmode_t mode,
6933 unsigned int cmd, unsigned long arg)
6936 case HOT_REMOVE_DISK:
6938 case SET_DISK_FAULTY:
6939 case SET_BITMAP_FILE:
6940 /* These take in integer arg, do not convert */
6943 arg = (unsigned long)compat_ptr(arg);
6947 return md_ioctl(bdev, mode, cmd, arg);
6949 #endif /* CONFIG_COMPAT */
6951 static int md_open(struct block_device *bdev, fmode_t mode)
6954 * Succeed if we can lock the mddev, which confirms that
6955 * it isn't being stopped right now.
6957 struct mddev *mddev = mddev_find(bdev->bd_dev);
6963 if (mddev->gendisk != bdev->bd_disk) {
6964 /* we are racing with mddev_put which is discarding this
6968 /* Wait until bdev->bd_disk is definitely gone */
6969 flush_workqueue(md_misc_wq);
6970 /* Then retry the open from the top */
6971 return -ERESTARTSYS;
6973 BUG_ON(mddev != bdev->bd_disk->private_data);
6975 if ((err = mutex_lock_interruptible(&mddev->open_mutex)))
6979 atomic_inc(&mddev->openers);
6980 clear_bit(MD_STILL_CLOSED, &mddev->flags);
6981 mutex_unlock(&mddev->open_mutex);
6983 check_disk_change(bdev);
6988 static void md_release(struct gendisk *disk, fmode_t mode)
6990 struct mddev *mddev = disk->private_data;
6993 atomic_dec(&mddev->openers);
6997 static int md_media_changed(struct gendisk *disk)
6999 struct mddev *mddev = disk->private_data;
7001 return mddev->changed;
7004 static int md_revalidate(struct gendisk *disk)
7006 struct mddev *mddev = disk->private_data;
7011 static const struct block_device_operations md_fops =
7013 .owner = THIS_MODULE,
7015 .release = md_release,
7017 #ifdef CONFIG_COMPAT
7018 .compat_ioctl = md_compat_ioctl,
7020 .getgeo = md_getgeo,
7021 .media_changed = md_media_changed,
7022 .revalidate_disk= md_revalidate,
7025 static int md_thread(void *arg)
7027 struct md_thread *thread = arg;
7030 * md_thread is a 'system-thread', it's priority should be very
7031 * high. We avoid resource deadlocks individually in each
7032 * raid personality. (RAID5 does preallocation) We also use RR and
7033 * the very same RT priority as kswapd, thus we will never get
7034 * into a priority inversion deadlock.
7036 * we definitely have to have equal or higher priority than
7037 * bdflush, otherwise bdflush will deadlock if there are too
7038 * many dirty RAID5 blocks.
7041 allow_signal(SIGKILL);
7042 while (!kthread_should_stop()) {
7044 /* We need to wait INTERRUPTIBLE so that
7045 * we don't add to the load-average.
7046 * That means we need to be sure no signals are
7049 if (signal_pending(current))
7050 flush_signals(current);
7052 wait_event_interruptible_timeout
7054 test_bit(THREAD_WAKEUP, &thread->flags)
7055 || kthread_should_stop(),
7058 clear_bit(THREAD_WAKEUP, &thread->flags);
7059 if (!kthread_should_stop())
7060 thread->run(thread);
7066 void md_wakeup_thread(struct md_thread *thread)
7069 pr_debug("md: waking up MD thread %s.\n", thread->tsk->comm);
7070 set_bit(THREAD_WAKEUP, &thread->flags);
7071 wake_up(&thread->wqueue);
7074 EXPORT_SYMBOL(md_wakeup_thread);
7076 struct md_thread *md_register_thread(void (*run) (struct md_thread *),
7077 struct mddev *mddev, const char *name)
7079 struct md_thread *thread;
7081 thread = kzalloc(sizeof(struct md_thread), GFP_KERNEL);
7085 init_waitqueue_head(&thread->wqueue);
7088 thread->mddev = mddev;
7089 thread->timeout = MAX_SCHEDULE_TIMEOUT;
7090 thread->tsk = kthread_run(md_thread, thread,
7092 mdname(thread->mddev),
7094 if (IS_ERR(thread->tsk)) {
7100 EXPORT_SYMBOL(md_register_thread);
7102 void md_unregister_thread(struct md_thread **threadp)
7104 struct md_thread *thread = *threadp;
7107 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
7108 /* Locking ensures that mddev_unlock does not wake_up a
7109 * non-existent thread
7111 spin_lock(&pers_lock);
7113 spin_unlock(&pers_lock);
7115 kthread_stop(thread->tsk);
7118 EXPORT_SYMBOL(md_unregister_thread);
7120 void md_error(struct mddev *mddev, struct md_rdev *rdev)
7122 if (!rdev || test_bit(Faulty, &rdev->flags))
7125 if (!mddev->pers || !mddev->pers->error_handler)
7127 mddev->pers->error_handler(mddev,rdev);
7128 if (mddev->degraded)
7129 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7130 sysfs_notify_dirent_safe(rdev->sysfs_state);
7131 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7132 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7133 md_wakeup_thread(mddev->thread);
7134 if (mddev->event_work.func)
7135 queue_work(md_misc_wq, &mddev->event_work);
7136 md_new_event_inintr(mddev);
7138 EXPORT_SYMBOL(md_error);
7140 /* seq_file implementation /proc/mdstat */
7142 static void status_unused(struct seq_file *seq)
7145 struct md_rdev *rdev;
7147 seq_printf(seq, "unused devices: ");
7149 list_for_each_entry(rdev, &pending_raid_disks, same_set) {
7150 char b[BDEVNAME_SIZE];
7152 seq_printf(seq, "%s ",
7153 bdevname(rdev->bdev,b));
7156 seq_printf(seq, "<none>");
7158 seq_printf(seq, "\n");
7161 static int status_resync(struct seq_file *seq, struct mddev *mddev)
7163 sector_t max_sectors, resync, res;
7164 unsigned long dt, db;
7167 unsigned int per_milli;
7169 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
7170 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
7171 max_sectors = mddev->resync_max_sectors;
7173 max_sectors = mddev->dev_sectors;
7175 resync = mddev->curr_resync;
7177 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
7178 /* Still cleaning up */
7179 resync = max_sectors;
7181 resync -= atomic_read(&mddev->recovery_active);
7184 if (mddev->recovery_cp < MaxSector) {
7185 seq_printf(seq, "\tresync=PENDING");
7191 seq_printf(seq, "\tresync=DELAYED");
7195 WARN_ON(max_sectors == 0);
7196 /* Pick 'scale' such that (resync>>scale)*1000 will fit
7197 * in a sector_t, and (max_sectors>>scale) will fit in a
7198 * u32, as those are the requirements for sector_div.
7199 * Thus 'scale' must be at least 10
7202 if (sizeof(sector_t) > sizeof(unsigned long)) {
7203 while ( max_sectors/2 > (1ULL<<(scale+32)))
7206 res = (resync>>scale)*1000;
7207 sector_div(res, (u32)((max_sectors>>scale)+1));
7211 int i, x = per_milli/50, y = 20-x;
7212 seq_printf(seq, "[");
7213 for (i = 0; i < x; i++)
7214 seq_printf(seq, "=");
7215 seq_printf(seq, ">");
7216 for (i = 0; i < y; i++)
7217 seq_printf(seq, ".");
7218 seq_printf(seq, "] ");
7220 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
7221 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
7223 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
7225 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
7226 "resync" : "recovery"))),
7227 per_milli/10, per_milli % 10,
7228 (unsigned long long) resync/2,
7229 (unsigned long long) max_sectors/2);
7232 * dt: time from mark until now
7233 * db: blocks written from mark until now
7234 * rt: remaining time
7236 * rt is a sector_t, so could be 32bit or 64bit.
7237 * So we divide before multiply in case it is 32bit and close
7239 * We scale the divisor (db) by 32 to avoid losing precision
7240 * near the end of resync when the number of remaining sectors
7242 * We then divide rt by 32 after multiplying by db to compensate.
7243 * The '+1' avoids division by zero if db is very small.
7245 dt = ((jiffies - mddev->resync_mark) / HZ);
7247 db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active))
7248 - mddev->resync_mark_cnt;
7250 rt = max_sectors - resync; /* number of remaining sectors */
7251 sector_div(rt, db/32+1);
7255 seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60,
7256 ((unsigned long)rt % 60)/6);
7258 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
7262 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
7264 struct list_head *tmp;
7266 struct mddev *mddev;
7274 spin_lock(&all_mddevs_lock);
7275 list_for_each(tmp,&all_mddevs)
7277 mddev = list_entry(tmp, struct mddev, all_mddevs);
7279 spin_unlock(&all_mddevs_lock);
7282 spin_unlock(&all_mddevs_lock);
7284 return (void*)2;/* tail */
7288 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
7290 struct list_head *tmp;
7291 struct mddev *next_mddev, *mddev = v;
7297 spin_lock(&all_mddevs_lock);
7299 tmp = all_mddevs.next;
7301 tmp = mddev->all_mddevs.next;
7302 if (tmp != &all_mddevs)
7303 next_mddev = mddev_get(list_entry(tmp,struct mddev,all_mddevs));
7305 next_mddev = (void*)2;
7308 spin_unlock(&all_mddevs_lock);
7316 static void md_seq_stop(struct seq_file *seq, void *v)
7318 struct mddev *mddev = v;
7320 if (mddev && v != (void*)1 && v != (void*)2)
7324 static int md_seq_show(struct seq_file *seq, void *v)
7326 struct mddev *mddev = v;
7328 struct md_rdev *rdev;
7330 if (v == (void*)1) {
7331 struct md_personality *pers;
7332 seq_printf(seq, "Personalities : ");
7333 spin_lock(&pers_lock);
7334 list_for_each_entry(pers, &pers_list, list)
7335 seq_printf(seq, "[%s] ", pers->name);
7337 spin_unlock(&pers_lock);
7338 seq_printf(seq, "\n");
7339 seq->poll_event = atomic_read(&md_event_count);
7342 if (v == (void*)2) {
7347 spin_lock(&mddev->lock);
7348 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
7349 seq_printf(seq, "%s : %sactive", mdname(mddev),
7350 mddev->pers ? "" : "in");
7353 seq_printf(seq, " (read-only)");
7355 seq_printf(seq, " (auto-read-only)");
7356 seq_printf(seq, " %s", mddev->pers->name);
7361 rdev_for_each_rcu(rdev, mddev) {
7362 char b[BDEVNAME_SIZE];
7363 seq_printf(seq, " %s[%d]",
7364 bdevname(rdev->bdev,b), rdev->desc_nr);
7365 if (test_bit(WriteMostly, &rdev->flags))
7366 seq_printf(seq, "(W)");
7367 if (test_bit(Journal, &rdev->flags))
7368 seq_printf(seq, "(J)");
7369 if (test_bit(Faulty, &rdev->flags)) {
7370 seq_printf(seq, "(F)");
7373 if (rdev->raid_disk < 0)
7374 seq_printf(seq, "(S)"); /* spare */
7375 if (test_bit(Replacement, &rdev->flags))
7376 seq_printf(seq, "(R)");
7377 sectors += rdev->sectors;
7381 if (!list_empty(&mddev->disks)) {
7383 seq_printf(seq, "\n %llu blocks",
7384 (unsigned long long)
7385 mddev->array_sectors / 2);
7387 seq_printf(seq, "\n %llu blocks",
7388 (unsigned long long)sectors / 2);
7390 if (mddev->persistent) {
7391 if (mddev->major_version != 0 ||
7392 mddev->minor_version != 90) {
7393 seq_printf(seq," super %d.%d",
7394 mddev->major_version,
7395 mddev->minor_version);
7397 } else if (mddev->external)
7398 seq_printf(seq, " super external:%s",
7399 mddev->metadata_type);
7401 seq_printf(seq, " super non-persistent");
7404 mddev->pers->status(seq, mddev);
7405 seq_printf(seq, "\n ");
7406 if (mddev->pers->sync_request) {
7407 if (status_resync(seq, mddev))
7408 seq_printf(seq, "\n ");
7411 seq_printf(seq, "\n ");
7413 bitmap_status(seq, mddev->bitmap);
7415 seq_printf(seq, "\n");
7417 spin_unlock(&mddev->lock);
7422 static const struct seq_operations md_seq_ops = {
7423 .start = md_seq_start,
7424 .next = md_seq_next,
7425 .stop = md_seq_stop,
7426 .show = md_seq_show,
7429 static int md_seq_open(struct inode *inode, struct file *file)
7431 struct seq_file *seq;
7434 error = seq_open(file, &md_seq_ops);
7438 seq = file->private_data;
7439 seq->poll_event = atomic_read(&md_event_count);
7443 static int md_unloading;
7444 static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
7446 struct seq_file *seq = filp->private_data;
7450 return POLLIN|POLLRDNORM|POLLERR|POLLPRI;
7451 poll_wait(filp, &md_event_waiters, wait);
7453 /* always allow read */
7454 mask = POLLIN | POLLRDNORM;
7456 if (seq->poll_event != atomic_read(&md_event_count))
7457 mask |= POLLERR | POLLPRI;
7461 static const struct file_operations md_seq_fops = {
7462 .owner = THIS_MODULE,
7463 .open = md_seq_open,
7465 .llseek = seq_lseek,
7466 .release = seq_release_private,
7467 .poll = mdstat_poll,
7470 int register_md_personality(struct md_personality *p)
7472 printk(KERN_INFO "md: %s personality registered for level %d\n",
7474 spin_lock(&pers_lock);
7475 list_add_tail(&p->list, &pers_list);
7476 spin_unlock(&pers_lock);
7479 EXPORT_SYMBOL(register_md_personality);
7481 int unregister_md_personality(struct md_personality *p)
7483 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
7484 spin_lock(&pers_lock);
7485 list_del_init(&p->list);
7486 spin_unlock(&pers_lock);
7489 EXPORT_SYMBOL(unregister_md_personality);
7491 int register_md_cluster_operations(struct md_cluster_operations *ops,
7492 struct module *module)
7495 spin_lock(&pers_lock);
7496 if (md_cluster_ops != NULL)
7499 md_cluster_ops = ops;
7500 md_cluster_mod = module;
7502 spin_unlock(&pers_lock);
7505 EXPORT_SYMBOL(register_md_cluster_operations);
7507 int unregister_md_cluster_operations(void)
7509 spin_lock(&pers_lock);
7510 md_cluster_ops = NULL;
7511 spin_unlock(&pers_lock);
7514 EXPORT_SYMBOL(unregister_md_cluster_operations);
7516 int md_setup_cluster(struct mddev *mddev, int nodes)
7520 err = request_module("md-cluster");
7522 pr_err("md-cluster module not found.\n");
7526 spin_lock(&pers_lock);
7527 if (!md_cluster_ops || !try_module_get(md_cluster_mod)) {
7528 spin_unlock(&pers_lock);
7531 spin_unlock(&pers_lock);
7533 return md_cluster_ops->join(mddev, nodes);
7536 void md_cluster_stop(struct mddev *mddev)
7538 if (!md_cluster_ops)
7540 md_cluster_ops->leave(mddev);
7541 module_put(md_cluster_mod);
7544 static int is_mddev_idle(struct mddev *mddev, int init)
7546 struct md_rdev *rdev;
7552 rdev_for_each_rcu(rdev, mddev) {
7553 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
7554 curr_events = (int)part_stat_read(&disk->part0, sectors[0]) +
7555 (int)part_stat_read(&disk->part0, sectors[1]) -
7556 atomic_read(&disk->sync_io);
7557 /* sync IO will cause sync_io to increase before the disk_stats
7558 * as sync_io is counted when a request starts, and
7559 * disk_stats is counted when it completes.
7560 * So resync activity will cause curr_events to be smaller than
7561 * when there was no such activity.
7562 * non-sync IO will cause disk_stat to increase without
7563 * increasing sync_io so curr_events will (eventually)
7564 * be larger than it was before. Once it becomes
7565 * substantially larger, the test below will cause
7566 * the array to appear non-idle, and resync will slow
7568 * If there is a lot of outstanding resync activity when
7569 * we set last_event to curr_events, then all that activity
7570 * completing might cause the array to appear non-idle
7571 * and resync will be slowed down even though there might
7572 * not have been non-resync activity. This will only
7573 * happen once though. 'last_events' will soon reflect
7574 * the state where there is little or no outstanding
7575 * resync requests, and further resync activity will
7576 * always make curr_events less than last_events.
7579 if (init || curr_events - rdev->last_events > 64) {
7580 rdev->last_events = curr_events;
7588 void md_done_sync(struct mddev *mddev, int blocks, int ok)
7590 /* another "blocks" (512byte) blocks have been synced */
7591 atomic_sub(blocks, &mddev->recovery_active);
7592 wake_up(&mddev->recovery_wait);
7594 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7595 set_bit(MD_RECOVERY_ERROR, &mddev->recovery);
7596 md_wakeup_thread(mddev->thread);
7597 // stop recovery, signal do_sync ....
7600 EXPORT_SYMBOL(md_done_sync);
7602 /* md_write_start(mddev, bi)
7603 * If we need to update some array metadata (e.g. 'active' flag
7604 * in superblock) before writing, schedule a superblock update
7605 * and wait for it to complete.
7607 void md_write_start(struct mddev *mddev, struct bio *bi)
7610 if (bio_data_dir(bi) != WRITE)
7613 BUG_ON(mddev->ro == 1);
7614 if (mddev->ro == 2) {
7615 /* need to switch to read/write */
7617 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7618 md_wakeup_thread(mddev->thread);
7619 md_wakeup_thread(mddev->sync_thread);
7622 atomic_inc(&mddev->writes_pending);
7623 if (mddev->safemode == 1)
7624 mddev->safemode = 0;
7625 if (mddev->in_sync) {
7626 spin_lock(&mddev->lock);
7627 if (mddev->in_sync) {
7629 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
7630 set_bit(MD_CHANGE_PENDING, &mddev->flags);
7631 md_wakeup_thread(mddev->thread);
7634 spin_unlock(&mddev->lock);
7637 sysfs_notify_dirent_safe(mddev->sysfs_state);
7638 wait_event(mddev->sb_wait,
7639 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
7641 EXPORT_SYMBOL(md_write_start);
7643 void md_write_end(struct mddev *mddev)
7645 if (atomic_dec_and_test(&mddev->writes_pending)) {
7646 if (mddev->safemode == 2)
7647 md_wakeup_thread(mddev->thread);
7648 else if (mddev->safemode_delay)
7649 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
7652 EXPORT_SYMBOL(md_write_end);
7654 /* md_allow_write(mddev)
7655 * Calling this ensures that the array is marked 'active' so that writes
7656 * may proceed without blocking. It is important to call this before
7657 * attempting a GFP_KERNEL allocation while holding the mddev lock.
7658 * Must be called with mddev_lock held.
7660 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
7661 * is dropped, so return -EAGAIN after notifying userspace.
7663 int md_allow_write(struct mddev *mddev)
7669 if (!mddev->pers->sync_request)
7672 spin_lock(&mddev->lock);
7673 if (mddev->in_sync) {
7675 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
7676 set_bit(MD_CHANGE_PENDING, &mddev->flags);
7677 if (mddev->safemode_delay &&
7678 mddev->safemode == 0)
7679 mddev->safemode = 1;
7680 spin_unlock(&mddev->lock);
7681 md_update_sb(mddev, 0);
7682 sysfs_notify_dirent_safe(mddev->sysfs_state);
7684 spin_unlock(&mddev->lock);
7686 if (test_bit(MD_CHANGE_PENDING, &mddev->flags))
7691 EXPORT_SYMBOL_GPL(md_allow_write);
7693 #define SYNC_MARKS 10
7694 #define SYNC_MARK_STEP (3*HZ)
7695 #define UPDATE_FREQUENCY (5*60*HZ)
7696 void md_do_sync(struct md_thread *thread)
7698 struct mddev *mddev = thread->mddev;
7699 struct mddev *mddev2;
7700 unsigned int currspeed = 0,
7702 sector_t max_sectors,j, io_sectors, recovery_done;
7703 unsigned long mark[SYNC_MARKS];
7704 unsigned long update_time;
7705 sector_t mark_cnt[SYNC_MARKS];
7707 struct list_head *tmp;
7708 sector_t last_check;
7710 struct md_rdev *rdev;
7711 char *desc, *action = NULL;
7712 struct blk_plug plug;
7713 bool cluster_resync_finished = false;
7715 /* just incase thread restarts... */
7716 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
7718 if (mddev->ro) {/* never try to sync a read-only array */
7719 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7723 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
7724 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) {
7725 desc = "data-check";
7727 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
7728 desc = "requested-resync";
7732 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
7737 mddev->last_sync_action = action ?: desc;
7739 /* we overload curr_resync somewhat here.
7740 * 0 == not engaged in resync at all
7741 * 2 == checking that there is no conflict with another sync
7742 * 1 == like 2, but have yielded to allow conflicting resync to
7744 * other == active in resync - this many blocks
7746 * Before starting a resync we must have set curr_resync to
7747 * 2, and then checked that every "conflicting" array has curr_resync
7748 * less than ours. When we find one that is the same or higher
7749 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
7750 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
7751 * This will mean we have to start checking from the beginning again.
7756 mddev->curr_resync = 2;
7759 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
7761 for_each_mddev(mddev2, tmp) {
7762 if (mddev2 == mddev)
7764 if (!mddev->parallel_resync
7765 && mddev2->curr_resync
7766 && match_mddev_units(mddev, mddev2)) {
7768 if (mddev < mddev2 && mddev->curr_resync == 2) {
7769 /* arbitrarily yield */
7770 mddev->curr_resync = 1;
7771 wake_up(&resync_wait);
7773 if (mddev > mddev2 && mddev->curr_resync == 1)
7774 /* no need to wait here, we can wait the next
7775 * time 'round when curr_resync == 2
7778 /* We need to wait 'interruptible' so as not to
7779 * contribute to the load average, and not to
7780 * be caught by 'softlockup'
7782 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
7783 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
7784 mddev2->curr_resync >= mddev->curr_resync) {
7785 printk(KERN_INFO "md: delaying %s of %s"
7786 " until %s has finished (they"
7787 " share one or more physical units)\n",
7788 desc, mdname(mddev), mdname(mddev2));
7790 if (signal_pending(current))
7791 flush_signals(current);
7793 finish_wait(&resync_wait, &wq);
7796 finish_wait(&resync_wait, &wq);
7799 } while (mddev->curr_resync < 2);
7802 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
7803 /* resync follows the size requested by the personality,
7804 * which defaults to physical size, but can be virtual size
7806 max_sectors = mddev->resync_max_sectors;
7807 atomic64_set(&mddev->resync_mismatches, 0);
7808 /* we don't use the checkpoint if there's a bitmap */
7809 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
7810 j = mddev->resync_min;
7811 else if (!mddev->bitmap)
7812 j = mddev->recovery_cp;
7814 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
7815 max_sectors = mddev->resync_max_sectors;
7817 /* recovery follows the physical size of devices */
7818 max_sectors = mddev->dev_sectors;
7821 rdev_for_each_rcu(rdev, mddev)
7822 if (rdev->raid_disk >= 0 &&
7823 !test_bit(Faulty, &rdev->flags) &&
7824 !test_bit(In_sync, &rdev->flags) &&
7825 rdev->recovery_offset < j)
7826 j = rdev->recovery_offset;
7829 /* If there is a bitmap, we need to make sure all
7830 * writes that started before we added a spare
7831 * complete before we start doing a recovery.
7832 * Otherwise the write might complete and (via
7833 * bitmap_endwrite) set a bit in the bitmap after the
7834 * recovery has checked that bit and skipped that
7837 if (mddev->bitmap) {
7838 mddev->pers->quiesce(mddev, 1);
7839 mddev->pers->quiesce(mddev, 0);
7843 printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev));
7844 printk(KERN_INFO "md: minimum _guaranteed_ speed:"
7845 " %d KB/sec/disk.\n", speed_min(mddev));
7846 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
7847 "(but not more than %d KB/sec) for %s.\n",
7848 speed_max(mddev), desc);
7850 is_mddev_idle(mddev, 1); /* this initializes IO event counters */
7853 for (m = 0; m < SYNC_MARKS; m++) {
7855 mark_cnt[m] = io_sectors;
7858 mddev->resync_mark = mark[last_mark];
7859 mddev->resync_mark_cnt = mark_cnt[last_mark];
7862 * Tune reconstruction:
7864 window = 32*(PAGE_SIZE/512);
7865 printk(KERN_INFO "md: using %dk window, over a total of %lluk.\n",
7866 window/2, (unsigned long long)max_sectors/2);
7868 atomic_set(&mddev->recovery_active, 0);
7873 "md: resuming %s of %s from checkpoint.\n",
7874 desc, mdname(mddev));
7875 mddev->curr_resync = j;
7877 mddev->curr_resync = 3; /* no longer delayed */
7878 mddev->curr_resync_completed = j;
7879 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
7880 md_new_event(mddev);
7881 update_time = jiffies;
7883 blk_start_plug(&plug);
7884 while (j < max_sectors) {
7889 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
7890 ((mddev->curr_resync > mddev->curr_resync_completed &&
7891 (mddev->curr_resync - mddev->curr_resync_completed)
7892 > (max_sectors >> 4)) ||
7893 time_after_eq(jiffies, update_time + UPDATE_FREQUENCY) ||
7894 (j - mddev->curr_resync_completed)*2
7895 >= mddev->resync_max - mddev->curr_resync_completed ||
7896 mddev->curr_resync_completed > mddev->resync_max
7898 /* time to update curr_resync_completed */
7899 wait_event(mddev->recovery_wait,
7900 atomic_read(&mddev->recovery_active) == 0);
7901 mddev->curr_resync_completed = j;
7902 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) &&
7903 j > mddev->recovery_cp)
7904 mddev->recovery_cp = j;
7905 update_time = jiffies;
7906 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
7907 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
7910 while (j >= mddev->resync_max &&
7911 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
7912 /* As this condition is controlled by user-space,
7913 * we can block indefinitely, so use '_interruptible'
7914 * to avoid triggering warnings.
7916 flush_signals(current); /* just in case */
7917 wait_event_interruptible(mddev->recovery_wait,
7918 mddev->resync_max > j
7919 || test_bit(MD_RECOVERY_INTR,
7923 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
7926 sectors = mddev->pers->sync_request(mddev, j, &skipped);
7928 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7932 if (!skipped) { /* actual IO requested */
7933 io_sectors += sectors;
7934 atomic_add(sectors, &mddev->recovery_active);
7937 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
7941 if (j > max_sectors)
7942 /* when skipping, extra large numbers can be returned. */
7945 mddev->curr_resync = j;
7946 mddev->curr_mark_cnt = io_sectors;
7947 if (last_check == 0)
7948 /* this is the earliest that rebuild will be
7949 * visible in /proc/mdstat
7951 md_new_event(mddev);
7953 if (last_check + window > io_sectors || j == max_sectors)
7956 last_check = io_sectors;
7958 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
7960 int next = (last_mark+1) % SYNC_MARKS;
7962 mddev->resync_mark = mark[next];
7963 mddev->resync_mark_cnt = mark_cnt[next];
7964 mark[next] = jiffies;
7965 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
7969 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
7973 * this loop exits only if either when we are slower than
7974 * the 'hard' speed limit, or the system was IO-idle for
7976 * the system might be non-idle CPU-wise, but we only care
7977 * about not overloading the IO subsystem. (things like an
7978 * e2fsck being done on the RAID array should execute fast)
7982 recovery_done = io_sectors - atomic_read(&mddev->recovery_active);
7983 currspeed = ((unsigned long)(recovery_done - mddev->resync_mark_cnt))/2
7984 /((jiffies-mddev->resync_mark)/HZ +1) +1;
7986 if (currspeed > speed_min(mddev)) {
7987 if (currspeed > speed_max(mddev)) {
7991 if (!is_mddev_idle(mddev, 0)) {
7993 * Give other IO more of a chance.
7994 * The faster the devices, the less we wait.
7996 wait_event(mddev->recovery_wait,
7997 !atomic_read(&mddev->recovery_active));
8001 printk(KERN_INFO "md: %s: %s %s.\n",mdname(mddev), desc,
8002 test_bit(MD_RECOVERY_INTR, &mddev->recovery)
8003 ? "interrupted" : "done");
8005 * this also signals 'finished resyncing' to md_stop
8007 blk_finish_plug(&plug);
8008 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
8010 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8011 !test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8012 mddev->curr_resync > 2) {
8013 mddev->curr_resync_completed = mddev->curr_resync;
8014 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
8016 /* tell personality and other nodes that we are finished */
8017 if (mddev_is_clustered(mddev)) {
8018 md_cluster_ops->resync_finish(mddev);
8019 cluster_resync_finished = true;
8021 mddev->pers->sync_request(mddev, max_sectors, &skipped);
8023 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
8024 mddev->curr_resync > 2) {
8025 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
8026 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
8027 if (mddev->curr_resync >= mddev->recovery_cp) {
8029 "md: checkpointing %s of %s.\n",
8030 desc, mdname(mddev));
8031 if (test_bit(MD_RECOVERY_ERROR,
8033 mddev->recovery_cp =
8034 mddev->curr_resync_completed;
8036 mddev->recovery_cp =
8040 mddev->recovery_cp = MaxSector;
8042 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8043 mddev->curr_resync = MaxSector;
8045 rdev_for_each_rcu(rdev, mddev)
8046 if (rdev->raid_disk >= 0 &&
8047 mddev->delta_disks >= 0 &&
8048 !test_bit(Faulty, &rdev->flags) &&
8049 !test_bit(In_sync, &rdev->flags) &&
8050 rdev->recovery_offset < mddev->curr_resync)
8051 rdev->recovery_offset = mddev->curr_resync;
8056 set_bit(MD_CHANGE_DEVS, &mddev->flags);
8058 if (mddev_is_clustered(mddev) &&
8059 test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8060 !cluster_resync_finished)
8061 md_cluster_ops->resync_finish(mddev);
8063 spin_lock(&mddev->lock);
8064 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
8065 /* We completed so min/max setting can be forgotten if used. */
8066 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
8067 mddev->resync_min = 0;
8068 mddev->resync_max = MaxSector;
8069 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
8070 mddev->resync_min = mddev->curr_resync_completed;
8071 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
8072 mddev->curr_resync = 0;
8073 spin_unlock(&mddev->lock);
8075 wake_up(&resync_wait);
8076 md_wakeup_thread(mddev->thread);
8079 EXPORT_SYMBOL_GPL(md_do_sync);
8081 static int remove_and_add_spares(struct mddev *mddev,
8082 struct md_rdev *this)
8084 struct md_rdev *rdev;
8088 rdev_for_each(rdev, mddev)
8089 if ((this == NULL || rdev == this) &&
8090 rdev->raid_disk >= 0 &&
8091 !test_bit(Blocked, &rdev->flags) &&
8092 (test_bit(Faulty, &rdev->flags) ||
8093 ! test_bit(In_sync, &rdev->flags)) &&
8094 atomic_read(&rdev->nr_pending)==0) {
8095 if (mddev->pers->hot_remove_disk(
8096 mddev, rdev) == 0) {
8097 sysfs_unlink_rdev(mddev, rdev);
8098 rdev->raid_disk = -1;
8102 if (removed && mddev->kobj.sd)
8103 sysfs_notify(&mddev->kobj, NULL, "degraded");
8105 if (this && removed)
8108 rdev_for_each(rdev, mddev) {
8109 if (this && this != rdev)
8111 if (test_bit(Candidate, &rdev->flags))
8113 if (rdev->raid_disk >= 0 &&
8114 !test_bit(In_sync, &rdev->flags) &&
8115 !test_bit(Faulty, &rdev->flags))
8117 if (rdev->raid_disk >= 0)
8119 if (test_bit(Faulty, &rdev->flags))
8121 if (test_bit(Journal, &rdev->flags))
8124 ! (rdev->saved_raid_disk >= 0 &&
8125 !test_bit(Bitmap_sync, &rdev->flags)))
8128 if (rdev->saved_raid_disk < 0)
8129 rdev->recovery_offset = 0;
8131 hot_add_disk(mddev, rdev) == 0) {
8132 if (sysfs_link_rdev(mddev, rdev))
8133 /* failure here is OK */;
8135 md_new_event(mddev);
8136 set_bit(MD_CHANGE_DEVS, &mddev->flags);
8141 set_bit(MD_CHANGE_DEVS, &mddev->flags);
8145 static void md_start_sync(struct work_struct *ws)
8147 struct mddev *mddev = container_of(ws, struct mddev, del_work);
8150 if (mddev_is_clustered(mddev)) {
8151 ret = md_cluster_ops->resync_start(mddev);
8153 mddev->sync_thread = NULL;
8158 mddev->sync_thread = md_register_thread(md_do_sync,
8162 if (!mddev->sync_thread) {
8163 if (!(mddev_is_clustered(mddev) && ret == -EAGAIN))
8164 printk(KERN_ERR "%s: could not start resync"
8167 /* leave the spares where they are, it shouldn't hurt */
8168 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8169 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
8170 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
8171 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
8172 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
8173 wake_up(&resync_wait);
8174 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
8176 if (mddev->sysfs_action)
8177 sysfs_notify_dirent_safe(mddev->sysfs_action);
8179 md_wakeup_thread(mddev->sync_thread);
8180 sysfs_notify_dirent_safe(mddev->sysfs_action);
8181 md_new_event(mddev);
8185 * This routine is regularly called by all per-raid-array threads to
8186 * deal with generic issues like resync and super-block update.
8187 * Raid personalities that don't have a thread (linear/raid0) do not
8188 * need this as they never do any recovery or update the superblock.
8190 * It does not do any resync itself, but rather "forks" off other threads
8191 * to do that as needed.
8192 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
8193 * "->recovery" and create a thread at ->sync_thread.
8194 * When the thread finishes it sets MD_RECOVERY_DONE
8195 * and wakeups up this thread which will reap the thread and finish up.
8196 * This thread also removes any faulty devices (with nr_pending == 0).
8198 * The overall approach is:
8199 * 1/ if the superblock needs updating, update it.
8200 * 2/ If a recovery thread is running, don't do anything else.
8201 * 3/ If recovery has finished, clean up, possibly marking spares active.
8202 * 4/ If there are any faulty devices, remove them.
8203 * 5/ If array is degraded, try to add spares devices
8204 * 6/ If array has spares or is not in-sync, start a resync thread.
8206 void md_check_recovery(struct mddev *mddev)
8208 if (mddev->suspended)
8212 bitmap_daemon_work(mddev);
8214 if (signal_pending(current)) {
8215 if (mddev->pers->sync_request && !mddev->external) {
8216 printk(KERN_INFO "md: %s in immediate safe mode\n",
8218 mddev->safemode = 2;
8220 flush_signals(current);
8223 if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
8226 (mddev->flags & MD_UPDATE_SB_FLAGS & ~ (1<<MD_CHANGE_PENDING)) ||
8227 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
8228 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
8229 (mddev->external == 0 && mddev->safemode == 1) ||
8230 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
8231 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
8235 if (mddev_trylock(mddev)) {
8239 struct md_rdev *rdev;
8240 if (!mddev->external && mddev->in_sync)
8241 /* 'Blocked' flag not needed as failed devices
8242 * will be recorded if array switched to read/write.
8243 * Leaving it set will prevent the device
8244 * from being removed.
8246 rdev_for_each(rdev, mddev)
8247 clear_bit(Blocked, &rdev->flags);
8248 /* On a read-only array we can:
8249 * - remove failed devices
8250 * - add already-in_sync devices if the array itself
8252 * As we only add devices that are already in-sync,
8253 * we can activate the spares immediately.
8255 remove_and_add_spares(mddev, NULL);
8256 /* There is no thread, but we need to call
8257 * ->spare_active and clear saved_raid_disk
8259 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8260 md_reap_sync_thread(mddev);
8261 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8262 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8263 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
8267 if (!mddev->external) {
8269 spin_lock(&mddev->lock);
8270 if (mddev->safemode &&
8271 !atomic_read(&mddev->writes_pending) &&
8273 mddev->recovery_cp == MaxSector) {
8276 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
8278 if (mddev->safemode == 1)
8279 mddev->safemode = 0;
8280 spin_unlock(&mddev->lock);
8282 sysfs_notify_dirent_safe(mddev->sysfs_state);
8285 if (mddev->flags & MD_UPDATE_SB_FLAGS)
8286 md_update_sb(mddev, 0);
8288 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
8289 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
8290 /* resync/recovery still happening */
8291 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8294 if (mddev->sync_thread) {
8295 md_reap_sync_thread(mddev);
8298 /* Set RUNNING before clearing NEEDED to avoid
8299 * any transients in the value of "sync_action".
8301 mddev->curr_resync_completed = 0;
8302 spin_lock(&mddev->lock);
8303 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
8304 spin_unlock(&mddev->lock);
8305 /* Clear some bits that don't mean anything, but
8308 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
8309 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
8311 if (!test_and_clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
8312 test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
8314 /* no recovery is running.
8315 * remove any failed drives, then
8316 * add spares if possible.
8317 * Spares are also removed and re-added, to allow
8318 * the personality to fail the re-add.
8321 if (mddev->reshape_position != MaxSector) {
8322 if (mddev->pers->check_reshape == NULL ||
8323 mddev->pers->check_reshape(mddev) != 0)
8324 /* Cannot proceed */
8326 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
8327 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8328 } else if ((spares = remove_and_add_spares(mddev, NULL))) {
8329 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8330 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
8331 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
8332 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8333 } else if (mddev->recovery_cp < MaxSector) {
8334 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8335 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8336 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
8337 /* nothing to be done ... */
8340 if (mddev->pers->sync_request) {
8342 /* We are adding a device or devices to an array
8343 * which has the bitmap stored on all devices.
8344 * So make sure all bitmap pages get written
8346 bitmap_write_all(mddev->bitmap);
8348 INIT_WORK(&mddev->del_work, md_start_sync);
8349 queue_work(md_misc_wq, &mddev->del_work);
8353 if (!mddev->sync_thread) {
8354 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
8355 wake_up(&resync_wait);
8356 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
8358 if (mddev->sysfs_action)
8359 sysfs_notify_dirent_safe(mddev->sysfs_action);
8362 wake_up(&mddev->sb_wait);
8363 mddev_unlock(mddev);
8366 EXPORT_SYMBOL(md_check_recovery);
8368 void md_reap_sync_thread(struct mddev *mddev)
8370 struct md_rdev *rdev;
8372 /* resync has finished, collect result */
8373 md_unregister_thread(&mddev->sync_thread);
8374 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8375 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
8377 /* activate any spares */
8378 if (mddev->pers->spare_active(mddev)) {
8379 sysfs_notify(&mddev->kobj, NULL,
8381 set_bit(MD_CHANGE_DEVS, &mddev->flags);
8384 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8385 mddev->pers->finish_reshape)
8386 mddev->pers->finish_reshape(mddev);
8388 /* If array is no-longer degraded, then any saved_raid_disk
8389 * information must be scrapped.
8391 if (!mddev->degraded)
8392 rdev_for_each(rdev, mddev)
8393 rdev->saved_raid_disk = -1;
8395 md_update_sb(mddev, 1);
8396 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
8397 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
8398 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8399 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
8400 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
8401 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
8402 wake_up(&resync_wait);
8403 /* flag recovery needed just to double check */
8404 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8405 sysfs_notify_dirent_safe(mddev->sysfs_action);
8406 md_new_event(mddev);
8407 if (mddev->event_work.func)
8408 queue_work(md_misc_wq, &mddev->event_work);
8410 EXPORT_SYMBOL(md_reap_sync_thread);
8412 void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev)
8414 sysfs_notify_dirent_safe(rdev->sysfs_state);
8415 wait_event_timeout(rdev->blocked_wait,
8416 !test_bit(Blocked, &rdev->flags) &&
8417 !test_bit(BlockedBadBlocks, &rdev->flags),
8418 msecs_to_jiffies(5000));
8419 rdev_dec_pending(rdev, mddev);
8421 EXPORT_SYMBOL(md_wait_for_blocked_rdev);
8423 void md_finish_reshape(struct mddev *mddev)
8425 /* called be personality module when reshape completes. */
8426 struct md_rdev *rdev;
8428 rdev_for_each(rdev, mddev) {
8429 if (rdev->data_offset > rdev->new_data_offset)
8430 rdev->sectors += rdev->data_offset - rdev->new_data_offset;
8432 rdev->sectors -= rdev->new_data_offset - rdev->data_offset;
8433 rdev->data_offset = rdev->new_data_offset;
8436 EXPORT_SYMBOL(md_finish_reshape);
8438 /* Bad block management.
8439 * We can record which blocks on each device are 'bad' and so just
8440 * fail those blocks, or that stripe, rather than the whole device.
8441 * Entries in the bad-block table are 64bits wide. This comprises:
8442 * Length of bad-range, in sectors: 0-511 for lengths 1-512
8443 * Start of bad-range, sector offset, 54 bits (allows 8 exbibytes)
8444 * A 'shift' can be set so that larger blocks are tracked and
8445 * consequently larger devices can be covered.
8446 * 'Acknowledged' flag - 1 bit. - the most significant bit.
8448 * Locking of the bad-block table uses a seqlock so md_is_badblock
8449 * might need to retry if it is very unlucky.
8450 * We will sometimes want to check for bad blocks in a bi_end_io function,
8451 * so we use the write_seqlock_irq variant.
8453 * When looking for a bad block we specify a range and want to
8454 * know if any block in the range is bad. So we binary-search
8455 * to the last range that starts at-or-before the given endpoint,
8456 * (or "before the sector after the target range")
8457 * then see if it ends after the given start.
8459 * 0 if there are no known bad blocks in the range
8460 * 1 if there are known bad block which are all acknowledged
8461 * -1 if there are bad blocks which have not yet been acknowledged in metadata.
8462 * plus the start/length of the first bad section we overlap.
8464 int md_is_badblock(struct badblocks *bb, sector_t s, int sectors,
8465 sector_t *first_bad, int *bad_sectors)
8471 sector_t target = s + sectors;
8474 if (bb->shift > 0) {
8475 /* round the start down, and the end up */
8477 target += (1<<bb->shift) - 1;
8478 target >>= bb->shift;
8479 sectors = target - s;
8481 /* 'target' is now the first block after the bad range */
8484 seq = read_seqbegin(&bb->lock);
8489 /* Binary search between lo and hi for 'target'
8490 * i.e. for the last range that starts before 'target'
8492 /* INVARIANT: ranges before 'lo' and at-or-after 'hi'
8493 * are known not to be the last range before target.
8494 * VARIANT: hi-lo is the number of possible
8495 * ranges, and decreases until it reaches 1
8497 while (hi - lo > 1) {
8498 int mid = (lo + hi) / 2;
8499 sector_t a = BB_OFFSET(p[mid]);
8501 /* This could still be the one, earlier ranges
8505 /* This and later ranges are definitely out. */
8508 /* 'lo' might be the last that started before target, but 'hi' isn't */
8510 /* need to check all range that end after 's' to see if
8511 * any are unacknowledged.
8514 BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) {
8515 if (BB_OFFSET(p[lo]) < target) {
8516 /* starts before the end, and finishes after
8517 * the start, so they must overlap
8519 if (rv != -1 && BB_ACK(p[lo]))
8523 *first_bad = BB_OFFSET(p[lo]);
8524 *bad_sectors = BB_LEN(p[lo]);
8530 if (read_seqretry(&bb->lock, seq))
8535 EXPORT_SYMBOL_GPL(md_is_badblock);
8538 * Add a range of bad blocks to the table.
8539 * This might extend the table, or might contract it
8540 * if two adjacent ranges can be merged.
8541 * We binary-search to find the 'insertion' point, then
8542 * decide how best to handle it.
8544 static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors,
8550 unsigned long flags;
8553 /* badblocks are disabled */
8557 /* round the start down, and the end up */
8558 sector_t next = s + sectors;
8560 next += (1<<bb->shift) - 1;
8565 write_seqlock_irqsave(&bb->lock, flags);
8570 /* Find the last range that starts at-or-before 's' */
8571 while (hi - lo > 1) {
8572 int mid = (lo + hi) / 2;
8573 sector_t a = BB_OFFSET(p[mid]);
8579 if (hi > lo && BB_OFFSET(p[lo]) > s)
8583 /* we found a range that might merge with the start
8586 sector_t a = BB_OFFSET(p[lo]);
8587 sector_t e = a + BB_LEN(p[lo]);
8588 int ack = BB_ACK(p[lo]);
8590 /* Yes, we can merge with a previous range */
8591 if (s == a && s + sectors >= e)
8592 /* new range covers old */
8595 ack = ack && acknowledged;
8597 if (e < s + sectors)
8599 if (e - a <= BB_MAX_LEN) {
8600 p[lo] = BB_MAKE(a, e-a, ack);
8603 /* does not all fit in one range,
8604 * make p[lo] maximal
8606 if (BB_LEN(p[lo]) != BB_MAX_LEN)
8607 p[lo] = BB_MAKE(a, BB_MAX_LEN, ack);
8613 if (sectors && hi < bb->count) {
8614 /* 'hi' points to the first range that starts after 's'.
8615 * Maybe we can merge with the start of that range */
8616 sector_t a = BB_OFFSET(p[hi]);
8617 sector_t e = a + BB_LEN(p[hi]);
8618 int ack = BB_ACK(p[hi]);
8619 if (a <= s + sectors) {
8620 /* merging is possible */
8621 if (e <= s + sectors) {
8626 ack = ack && acknowledged;
8629 if (e - a <= BB_MAX_LEN) {
8630 p[hi] = BB_MAKE(a, e-a, ack);
8633 p[hi] = BB_MAKE(a, BB_MAX_LEN, ack);
8641 if (sectors == 0 && hi < bb->count) {
8642 /* we might be able to combine lo and hi */
8643 /* Note: 's' is at the end of 'lo' */
8644 sector_t a = BB_OFFSET(p[hi]);
8645 int lolen = BB_LEN(p[lo]);
8646 int hilen = BB_LEN(p[hi]);
8647 int newlen = lolen + hilen - (s - a);
8648 if (s >= a && newlen < BB_MAX_LEN) {
8649 /* yes, we can combine them */
8650 int ack = BB_ACK(p[lo]) && BB_ACK(p[hi]);
8651 p[lo] = BB_MAKE(BB_OFFSET(p[lo]), newlen, ack);
8652 memmove(p + hi, p + hi + 1,
8653 (bb->count - hi - 1) * 8);
8658 /* didn't merge (it all).
8659 * Need to add a range just before 'hi' */
8660 if (bb->count >= MD_MAX_BADBLOCKS) {
8661 /* No room for more */
8665 int this_sectors = sectors;
8666 memmove(p + hi + 1, p + hi,
8667 (bb->count - hi) * 8);
8670 if (this_sectors > BB_MAX_LEN)
8671 this_sectors = BB_MAX_LEN;
8672 p[hi] = BB_MAKE(s, this_sectors, acknowledged);
8673 sectors -= this_sectors;
8680 bb->unacked_exist = 1;
8681 write_sequnlock_irqrestore(&bb->lock, flags);
8686 int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
8691 s += rdev->new_data_offset;
8693 s += rdev->data_offset;
8694 rv = md_set_badblocks(&rdev->badblocks,
8697 /* Make sure they get written out promptly */
8698 sysfs_notify_dirent_safe(rdev->sysfs_state);
8699 set_bit(MD_CHANGE_CLEAN, &rdev->mddev->flags);
8700 set_bit(MD_CHANGE_PENDING, &rdev->mddev->flags);
8701 md_wakeup_thread(rdev->mddev->thread);
8705 EXPORT_SYMBOL_GPL(rdev_set_badblocks);
8708 * Remove a range of bad blocks from the table.
8709 * This may involve extending the table if we spilt a region,
8710 * but it must not fail. So if the table becomes full, we just
8711 * drop the remove request.
8713 static int md_clear_badblocks(struct badblocks *bb, sector_t s, int sectors)
8717 sector_t target = s + sectors;
8720 if (bb->shift > 0) {
8721 /* When clearing we round the start up and the end down.
8722 * This should not matter as the shift should align with
8723 * the block size and no rounding should ever be needed.
8724 * However it is better the think a block is bad when it
8725 * isn't than to think a block is not bad when it is.
8727 s += (1<<bb->shift) - 1;
8729 target >>= bb->shift;
8730 sectors = target - s;
8733 write_seqlock_irq(&bb->lock);
8738 /* Find the last range that starts before 'target' */
8739 while (hi - lo > 1) {
8740 int mid = (lo + hi) / 2;
8741 sector_t a = BB_OFFSET(p[mid]);
8748 /* p[lo] is the last range that could overlap the
8749 * current range. Earlier ranges could also overlap,
8750 * but only this one can overlap the end of the range.
8752 if (BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > target) {
8753 /* Partial overlap, leave the tail of this range */
8754 int ack = BB_ACK(p[lo]);
8755 sector_t a = BB_OFFSET(p[lo]);
8756 sector_t end = a + BB_LEN(p[lo]);
8759 /* we need to split this range */
8760 if (bb->count >= MD_MAX_BADBLOCKS) {
8764 memmove(p+lo+1, p+lo, (bb->count - lo) * 8);
8766 p[lo] = BB_MAKE(a, s-a, ack);
8769 p[lo] = BB_MAKE(target, end - target, ack);
8770 /* there is no longer an overlap */
8775 BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) {
8776 /* This range does overlap */
8777 if (BB_OFFSET(p[lo]) < s) {
8778 /* Keep the early parts of this range. */
8779 int ack = BB_ACK(p[lo]);
8780 sector_t start = BB_OFFSET(p[lo]);
8781 p[lo] = BB_MAKE(start, s - start, ack);
8782 /* now low doesn't overlap, so.. */
8787 /* 'lo' is strictly before, 'hi' is strictly after,
8788 * anything between needs to be discarded
8791 memmove(p+lo+1, p+hi, (bb->count - hi) * 8);
8792 bb->count -= (hi - lo - 1);
8798 write_sequnlock_irq(&bb->lock);
8802 int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
8806 s += rdev->new_data_offset;
8808 s += rdev->data_offset;
8809 return md_clear_badblocks(&rdev->badblocks,
8812 EXPORT_SYMBOL_GPL(rdev_clear_badblocks);
8815 * Acknowledge all bad blocks in a list.
8816 * This only succeeds if ->changed is clear. It is used by
8817 * in-kernel metadata updates
8819 void md_ack_all_badblocks(struct badblocks *bb)
8821 if (bb->page == NULL || bb->changed)
8822 /* no point even trying */
8824 write_seqlock_irq(&bb->lock);
8826 if (bb->changed == 0 && bb->unacked_exist) {
8829 for (i = 0; i < bb->count ; i++) {
8830 if (!BB_ACK(p[i])) {
8831 sector_t start = BB_OFFSET(p[i]);
8832 int len = BB_LEN(p[i]);
8833 p[i] = BB_MAKE(start, len, 1);
8836 bb->unacked_exist = 0;
8838 write_sequnlock_irq(&bb->lock);
8840 EXPORT_SYMBOL_GPL(md_ack_all_badblocks);
8842 /* sysfs access to bad-blocks list.
8843 * We present two files.
8844 * 'bad-blocks' lists sector numbers and lengths of ranges that
8845 * are recorded as bad. The list is truncated to fit within
8846 * the one-page limit of sysfs.
8847 * Writing "sector length" to this file adds an acknowledged
8849 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
8850 * been acknowledged. Writing to this file adds bad blocks
8851 * without acknowledging them. This is largely for testing.
8855 badblocks_show(struct badblocks *bb, char *page, int unack)
8866 seq = read_seqbegin(&bb->lock);
8871 while (len < PAGE_SIZE && i < bb->count) {
8872 sector_t s = BB_OFFSET(p[i]);
8873 unsigned int length = BB_LEN(p[i]);
8874 int ack = BB_ACK(p[i]);
8880 len += snprintf(page+len, PAGE_SIZE-len, "%llu %u\n",
8881 (unsigned long long)s << bb->shift,
8882 length << bb->shift);
8884 if (unack && len == 0)
8885 bb->unacked_exist = 0;
8887 if (read_seqretry(&bb->lock, seq))
8896 badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack)
8898 unsigned long long sector;
8902 /* Allow clearing via sysfs *only* for testing/debugging.
8903 * Normally only a successful write may clear a badblock
8906 if (page[0] == '-') {
8910 #endif /* DO_DEBUG */
8912 switch (sscanf(page, "%llu %d%c", §or, &length, &newline)) {
8914 if (newline != '\n')
8926 md_clear_badblocks(bb, sector, length);
8929 #endif /* DO_DEBUG */
8930 if (md_set_badblocks(bb, sector, length, !unack))
8936 static int md_notify_reboot(struct notifier_block *this,
8937 unsigned long code, void *x)
8939 struct list_head *tmp;
8940 struct mddev *mddev;
8943 for_each_mddev(mddev, tmp) {
8944 if (mddev_trylock(mddev)) {
8946 __md_stop_writes(mddev);
8947 if (mddev->persistent)
8948 mddev->safemode = 2;
8949 mddev_unlock(mddev);
8954 * certain more exotic SCSI devices are known to be
8955 * volatile wrt too early system reboots. While the
8956 * right place to handle this issue is the given
8957 * driver, we do want to have a safe RAID driver ...
8965 static struct notifier_block md_notifier = {
8966 .notifier_call = md_notify_reboot,
8968 .priority = INT_MAX, /* before any real devices */
8971 static void md_geninit(void)
8973 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
8975 proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops);
8978 static int __init md_init(void)
8982 md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0);
8986 md_misc_wq = alloc_workqueue("md_misc", 0, 0);
8990 if ((ret = register_blkdev(MD_MAJOR, "md")) < 0)
8993 if ((ret = register_blkdev(0, "mdp")) < 0)
8997 blk_register_region(MKDEV(MD_MAJOR, 0), 512, THIS_MODULE,
8998 md_probe, NULL, NULL);
8999 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
9000 md_probe, NULL, NULL);
9002 register_reboot_notifier(&md_notifier);
9003 raid_table_header = register_sysctl_table(raid_root_table);
9009 unregister_blkdev(MD_MAJOR, "md");
9011 destroy_workqueue(md_misc_wq);
9013 destroy_workqueue(md_wq);
9018 static void check_sb_changes(struct mddev *mddev, struct md_rdev *rdev)
9020 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
9021 struct md_rdev *rdev2;
9023 char b[BDEVNAME_SIZE];
9025 /* Check for change of roles in the active devices */
9026 rdev_for_each(rdev2, mddev) {
9027 if (test_bit(Faulty, &rdev2->flags))
9030 /* Check if the roles changed */
9031 role = le16_to_cpu(sb->dev_roles[rdev2->desc_nr]);
9033 if (test_bit(Candidate, &rdev2->flags)) {
9034 if (role == 0xfffe) {
9035 pr_info("md: Removing Candidate device %s because add failed\n", bdevname(rdev2->bdev,b));
9036 md_kick_rdev_from_array(rdev2);
9040 clear_bit(Candidate, &rdev2->flags);
9043 if (role != rdev2->raid_disk) {
9045 if (rdev2->raid_disk == -1 && role != 0xffff) {
9046 rdev2->saved_raid_disk = role;
9047 ret = remove_and_add_spares(mddev, rdev2);
9048 pr_info("Activated spare: %s\n",
9049 bdevname(rdev2->bdev,b));
9053 * We just want to do the minimum to mark the disk
9054 * as faulty. The recovery is performed by the
9055 * one who initiated the error.
9057 if ((role == 0xfffe) || (role == 0xfffd)) {
9058 md_error(mddev, rdev2);
9059 clear_bit(Blocked, &rdev2->flags);
9064 if (mddev->raid_disks != le32_to_cpu(sb->raid_disks))
9065 update_raid_disks(mddev, le32_to_cpu(sb->raid_disks));
9067 /* Finally set the event to be up to date */
9068 mddev->events = le64_to_cpu(sb->events);
9071 static int read_rdev(struct mddev *mddev, struct md_rdev *rdev)
9074 struct page *swapout = rdev->sb_page;
9075 struct mdp_superblock_1 *sb;
9077 /* Store the sb page of the rdev in the swapout temporary
9078 * variable in case we err in the future
9080 rdev->sb_page = NULL;
9081 alloc_disk_sb(rdev);
9082 ClearPageUptodate(rdev->sb_page);
9083 rdev->sb_loaded = 0;
9084 err = super_types[mddev->major_version].load_super(rdev, NULL, mddev->minor_version);
9087 pr_warn("%s: %d Could not reload rdev(%d) err: %d. Restoring old values\n",
9088 __func__, __LINE__, rdev->desc_nr, err);
9089 put_page(rdev->sb_page);
9090 rdev->sb_page = swapout;
9091 rdev->sb_loaded = 1;
9095 sb = page_address(rdev->sb_page);
9096 /* Read the offset unconditionally, even if MD_FEATURE_RECOVERY_OFFSET
9100 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RECOVERY_OFFSET))
9101 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
9103 /* The other node finished recovery, call spare_active to set
9104 * device In_sync and mddev->degraded
9106 if (rdev->recovery_offset == MaxSector &&
9107 !test_bit(In_sync, &rdev->flags) &&
9108 mddev->pers->spare_active(mddev))
9109 sysfs_notify(&mddev->kobj, NULL, "degraded");
9115 void md_reload_sb(struct mddev *mddev, int nr)
9117 struct md_rdev *rdev;
9121 rdev_for_each_rcu(rdev, mddev) {
9122 if (rdev->desc_nr == nr)
9126 if (!rdev || rdev->desc_nr != nr) {
9127 pr_warn("%s: %d Could not find rdev with nr %d\n", __func__, __LINE__, nr);
9131 err = read_rdev(mddev, rdev);
9135 check_sb_changes(mddev, rdev);
9137 /* Read all rdev's to update recovery_offset */
9138 rdev_for_each_rcu(rdev, mddev)
9139 read_rdev(mddev, rdev);
9141 EXPORT_SYMBOL(md_reload_sb);
9146 * Searches all registered partitions for autorun RAID arrays
9150 static LIST_HEAD(all_detected_devices);
9151 struct detected_devices_node {
9152 struct list_head list;
9156 void md_autodetect_dev(dev_t dev)
9158 struct detected_devices_node *node_detected_dev;
9160 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
9161 if (node_detected_dev) {
9162 node_detected_dev->dev = dev;
9163 list_add_tail(&node_detected_dev->list, &all_detected_devices);
9165 printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed"
9166 ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev));
9170 static void autostart_arrays(int part)
9172 struct md_rdev *rdev;
9173 struct detected_devices_node *node_detected_dev;
9175 int i_scanned, i_passed;
9180 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
9182 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
9184 node_detected_dev = list_entry(all_detected_devices.next,
9185 struct detected_devices_node, list);
9186 list_del(&node_detected_dev->list);
9187 dev = node_detected_dev->dev;
9188 kfree(node_detected_dev);
9189 rdev = md_import_device(dev,0, 90);
9193 if (test_bit(Faulty, &rdev->flags))
9196 set_bit(AutoDetected, &rdev->flags);
9197 list_add(&rdev->same_set, &pending_raid_disks);
9201 printk(KERN_INFO "md: Scanned %d and added %d devices.\n",
9202 i_scanned, i_passed);
9204 autorun_devices(part);
9207 #endif /* !MODULE */
9209 static __exit void md_exit(void)
9211 struct mddev *mddev;
9212 struct list_head *tmp;
9215 blk_unregister_region(MKDEV(MD_MAJOR,0), 512);
9216 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
9218 unregister_blkdev(MD_MAJOR,"md");
9219 unregister_blkdev(mdp_major, "mdp");
9220 unregister_reboot_notifier(&md_notifier);
9221 unregister_sysctl_table(raid_table_header);
9223 /* We cannot unload the modules while some process is
9224 * waiting for us in select() or poll() - wake them up
9227 while (waitqueue_active(&md_event_waiters)) {
9228 /* not safe to leave yet */
9229 wake_up(&md_event_waiters);
9233 remove_proc_entry("mdstat", NULL);
9235 for_each_mddev(mddev, tmp) {
9236 export_array(mddev);
9237 mddev->hold_active = 0;
9239 destroy_workqueue(md_misc_wq);
9240 destroy_workqueue(md_wq);
9243 subsys_initcall(md_init);
9244 module_exit(md_exit)
9246 static int get_ro(char *buffer, struct kernel_param *kp)
9248 return sprintf(buffer, "%d", start_readonly);
9250 static int set_ro(const char *val, struct kernel_param *kp)
9252 return kstrtouint(val, 10, (unsigned int *)&start_readonly);
9255 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
9256 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
9257 module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR);
9259 MODULE_LICENSE("GPL");
9260 MODULE_DESCRIPTION("MD RAID framework");
9262 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);