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 blk_qc_t 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
265 return BLK_QC_T_NONE;
267 if (mddev->ro == 1 && unlikely(rw == WRITE)) {
268 if (bio_sectors(bio) != 0)
269 bio->bi_error = -EROFS;
271 return BLK_QC_T_NONE;
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 /* bio could be mergeable after passing to underlayer */
297 bio->bi_rw &= ~REQ_NOMERGE;
298 mddev->pers->make_request(mddev, bio);
300 cpu = part_stat_lock();
301 part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]);
302 part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw], sectors);
305 if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended)
306 wake_up(&mddev->sb_wait);
308 return BLK_QC_T_NONE;
311 /* mddev_suspend makes sure no new requests are submitted
312 * to the device, and that any requests that have been submitted
313 * are completely handled.
314 * Once mddev_detach() is called and completes, the module will be
317 void mddev_suspend(struct mddev *mddev)
319 if (mddev->suspended++)
322 wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0);
323 mddev->pers->quiesce(mddev, 1);
325 del_timer_sync(&mddev->safemode_timer);
327 EXPORT_SYMBOL_GPL(mddev_suspend);
329 void mddev_resume(struct mddev *mddev)
331 if (--mddev->suspended)
333 wake_up(&mddev->sb_wait);
334 mddev->pers->quiesce(mddev, 0);
336 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
337 md_wakeup_thread(mddev->thread);
338 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
340 EXPORT_SYMBOL_GPL(mddev_resume);
342 int mddev_congested(struct mddev *mddev, int bits)
344 struct md_personality *pers = mddev->pers;
348 if (mddev->suspended)
350 else if (pers && pers->congested)
351 ret = pers->congested(mddev, bits);
355 EXPORT_SYMBOL_GPL(mddev_congested);
356 static int md_congested(void *data, int bits)
358 struct mddev *mddev = data;
359 return mddev_congested(mddev, bits);
363 * Generic flush handling for md
366 static void md_end_flush(struct bio *bio)
368 struct md_rdev *rdev = bio->bi_private;
369 struct mddev *mddev = rdev->mddev;
371 rdev_dec_pending(rdev, mddev);
373 if (atomic_dec_and_test(&mddev->flush_pending)) {
374 /* The pre-request flush has finished */
375 queue_work(md_wq, &mddev->flush_work);
380 static void md_submit_flush_data(struct work_struct *ws);
382 static void submit_flushes(struct work_struct *ws)
384 struct mddev *mddev = container_of(ws, struct mddev, flush_work);
385 struct md_rdev *rdev;
387 INIT_WORK(&mddev->flush_work, md_submit_flush_data);
388 atomic_set(&mddev->flush_pending, 1);
390 rdev_for_each_rcu(rdev, mddev)
391 if (rdev->raid_disk >= 0 &&
392 !test_bit(Faulty, &rdev->flags)) {
393 /* Take two references, one is dropped
394 * when request finishes, one after
395 * we reclaim rcu_read_lock
398 atomic_inc(&rdev->nr_pending);
399 atomic_inc(&rdev->nr_pending);
401 bi = bio_alloc_mddev(GFP_NOIO, 0, mddev);
402 bi->bi_end_io = md_end_flush;
403 bi->bi_private = rdev;
404 bi->bi_bdev = rdev->bdev;
405 atomic_inc(&mddev->flush_pending);
406 submit_bio(WRITE_FLUSH, bi);
408 rdev_dec_pending(rdev, mddev);
411 if (atomic_dec_and_test(&mddev->flush_pending))
412 queue_work(md_wq, &mddev->flush_work);
415 static void md_submit_flush_data(struct work_struct *ws)
417 struct mddev *mddev = container_of(ws, struct mddev, flush_work);
418 struct bio *bio = mddev->flush_bio;
420 if (bio->bi_iter.bi_size == 0)
421 /* an empty barrier - all done */
424 bio->bi_rw &= ~REQ_FLUSH;
425 mddev->pers->make_request(mddev, bio);
428 mddev->flush_bio = NULL;
429 wake_up(&mddev->sb_wait);
432 void md_flush_request(struct mddev *mddev, struct bio *bio)
434 spin_lock_irq(&mddev->lock);
435 wait_event_lock_irq(mddev->sb_wait,
438 mddev->flush_bio = bio;
439 spin_unlock_irq(&mddev->lock);
441 INIT_WORK(&mddev->flush_work, submit_flushes);
442 queue_work(md_wq, &mddev->flush_work);
444 EXPORT_SYMBOL(md_flush_request);
446 void md_unplug(struct blk_plug_cb *cb, bool from_schedule)
448 struct mddev *mddev = cb->data;
449 md_wakeup_thread(mddev->thread);
452 EXPORT_SYMBOL(md_unplug);
454 static inline struct mddev *mddev_get(struct mddev *mddev)
456 atomic_inc(&mddev->active);
460 static void mddev_delayed_delete(struct work_struct *ws);
462 static void mddev_put(struct mddev *mddev)
464 struct bio_set *bs = NULL;
466 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
468 if (!mddev->raid_disks && list_empty(&mddev->disks) &&
469 mddev->ctime == 0 && !mddev->hold_active) {
470 /* Array is not configured at all, and not held active,
472 list_del_init(&mddev->all_mddevs);
474 mddev->bio_set = NULL;
475 if (mddev->gendisk) {
476 /* We did a probe so need to clean up. Call
477 * queue_work inside the spinlock so that
478 * flush_workqueue() after mddev_find will
479 * succeed in waiting for the work to be done.
481 INIT_WORK(&mddev->del_work, mddev_delayed_delete);
482 queue_work(md_misc_wq, &mddev->del_work);
486 spin_unlock(&all_mddevs_lock);
491 static void md_safemode_timeout(unsigned long data);
493 void mddev_init(struct mddev *mddev)
495 mutex_init(&mddev->open_mutex);
496 mutex_init(&mddev->reconfig_mutex);
497 mutex_init(&mddev->bitmap_info.mutex);
498 INIT_LIST_HEAD(&mddev->disks);
499 INIT_LIST_HEAD(&mddev->all_mddevs);
500 setup_timer(&mddev->safemode_timer, md_safemode_timeout,
501 (unsigned long) mddev);
502 atomic_set(&mddev->active, 1);
503 atomic_set(&mddev->openers, 0);
504 atomic_set(&mddev->active_io, 0);
505 spin_lock_init(&mddev->lock);
506 atomic_set(&mddev->flush_pending, 0);
507 init_waitqueue_head(&mddev->sb_wait);
508 init_waitqueue_head(&mddev->recovery_wait);
509 mddev->reshape_position = MaxSector;
510 mddev->reshape_backwards = 0;
511 mddev->last_sync_action = "none";
512 mddev->resync_min = 0;
513 mddev->resync_max = MaxSector;
514 mddev->level = LEVEL_NONE;
516 EXPORT_SYMBOL_GPL(mddev_init);
518 static struct mddev *mddev_find_locked(dev_t unit)
522 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
523 if (mddev->unit == unit)
529 static struct mddev *mddev_find(dev_t unit)
531 struct mddev *mddev, *new = NULL;
533 if (unit && MAJOR(unit) != MD_MAJOR)
534 unit &= ~((1<<MdpMinorShift)-1);
537 spin_lock(&all_mddevs_lock);
540 mddev = mddev_find_locked(unit);
543 spin_unlock(&all_mddevs_lock);
549 list_add(&new->all_mddevs, &all_mddevs);
550 spin_unlock(&all_mddevs_lock);
551 new->hold_active = UNTIL_IOCTL;
555 /* find an unused unit number */
556 static int next_minor = 512;
557 int start = next_minor;
561 dev = MKDEV(MD_MAJOR, next_minor);
563 if (next_minor > MINORMASK)
565 if (next_minor == start) {
566 /* Oh dear, all in use. */
567 spin_unlock(&all_mddevs_lock);
572 is_free = !mddev_find_locked(dev);
575 new->md_minor = MINOR(dev);
576 new->hold_active = UNTIL_STOP;
577 list_add(&new->all_mddevs, &all_mddevs);
578 spin_unlock(&all_mddevs_lock);
581 spin_unlock(&all_mddevs_lock);
583 new = kzalloc(sizeof(*new), GFP_KERNEL);
588 if (MAJOR(unit) == MD_MAJOR)
589 new->md_minor = MINOR(unit);
591 new->md_minor = MINOR(unit) >> MdpMinorShift;
598 static struct attribute_group md_redundancy_group;
600 void mddev_unlock(struct mddev *mddev)
602 if (mddev->to_remove) {
603 /* These cannot be removed under reconfig_mutex as
604 * an access to the files will try to take reconfig_mutex
605 * while holding the file unremovable, which leads to
607 * So hold set sysfs_active while the remove in happeing,
608 * and anything else which might set ->to_remove or my
609 * otherwise change the sysfs namespace will fail with
610 * -EBUSY if sysfs_active is still set.
611 * We set sysfs_active under reconfig_mutex and elsewhere
612 * test it under the same mutex to ensure its correct value
615 struct attribute_group *to_remove = mddev->to_remove;
616 mddev->to_remove = NULL;
617 mddev->sysfs_active = 1;
618 mutex_unlock(&mddev->reconfig_mutex);
620 if (mddev->kobj.sd) {
621 if (to_remove != &md_redundancy_group)
622 sysfs_remove_group(&mddev->kobj, to_remove);
623 if (mddev->pers == NULL ||
624 mddev->pers->sync_request == NULL) {
625 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
626 if (mddev->sysfs_action)
627 sysfs_put(mddev->sysfs_action);
628 mddev->sysfs_action = NULL;
631 mddev->sysfs_active = 0;
633 mutex_unlock(&mddev->reconfig_mutex);
635 /* As we've dropped the mutex we need a spinlock to
636 * make sure the thread doesn't disappear
638 spin_lock(&pers_lock);
639 md_wakeup_thread(mddev->thread);
640 spin_unlock(&pers_lock);
642 EXPORT_SYMBOL_GPL(mddev_unlock);
644 struct md_rdev *md_find_rdev_nr_rcu(struct mddev *mddev, int nr)
646 struct md_rdev *rdev;
648 rdev_for_each_rcu(rdev, mddev)
649 if (rdev->desc_nr == nr)
654 EXPORT_SYMBOL_GPL(md_find_rdev_nr_rcu);
656 static struct md_rdev *find_rdev(struct mddev *mddev, dev_t dev)
658 struct md_rdev *rdev;
660 rdev_for_each(rdev, mddev)
661 if (rdev->bdev->bd_dev == dev)
667 static struct md_rdev *find_rdev_rcu(struct mddev *mddev, dev_t dev)
669 struct md_rdev *rdev;
671 rdev_for_each_rcu(rdev, mddev)
672 if (rdev->bdev->bd_dev == dev)
678 static struct md_personality *find_pers(int level, char *clevel)
680 struct md_personality *pers;
681 list_for_each_entry(pers, &pers_list, list) {
682 if (level != LEVEL_NONE && pers->level == level)
684 if (strcmp(pers->name, clevel)==0)
690 /* return the offset of the super block in 512byte sectors */
691 static inline sector_t calc_dev_sboffset(struct md_rdev *rdev)
693 sector_t num_sectors = i_size_read(rdev->bdev->bd_inode) / 512;
694 return MD_NEW_SIZE_SECTORS(num_sectors);
697 static int alloc_disk_sb(struct md_rdev *rdev)
699 rdev->sb_page = alloc_page(GFP_KERNEL);
700 if (!rdev->sb_page) {
701 printk(KERN_ALERT "md: out of memory.\n");
708 void md_rdev_clear(struct md_rdev *rdev)
711 put_page(rdev->sb_page);
713 rdev->sb_page = NULL;
718 put_page(rdev->bb_page);
719 rdev->bb_page = NULL;
721 kfree(rdev->badblocks.page);
722 rdev->badblocks.page = NULL;
724 EXPORT_SYMBOL_GPL(md_rdev_clear);
726 static void super_written(struct bio *bio)
728 struct md_rdev *rdev = bio->bi_private;
729 struct mddev *mddev = rdev->mddev;
732 printk("md: super_written gets error=%d\n", bio->bi_error);
733 md_error(mddev, rdev);
736 if (atomic_dec_and_test(&mddev->pending_writes))
737 wake_up(&mddev->sb_wait);
741 void md_super_write(struct mddev *mddev, struct md_rdev *rdev,
742 sector_t sector, int size, struct page *page)
744 /* write first size bytes of page to sector of rdev
745 * Increment mddev->pending_writes before returning
746 * and decrement it on completion, waking up sb_wait
747 * if zero is reached.
748 * If an error occurred, call md_error
750 struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, mddev);
752 bio->bi_bdev = rdev->meta_bdev ? rdev->meta_bdev : rdev->bdev;
753 bio->bi_iter.bi_sector = sector;
754 bio_add_page(bio, page, size, 0);
755 bio->bi_private = rdev;
756 bio->bi_end_io = super_written;
758 atomic_inc(&mddev->pending_writes);
759 submit_bio(WRITE_FLUSH_FUA, bio);
762 void md_super_wait(struct mddev *mddev)
764 /* wait for all superblock writes that were scheduled to complete */
765 wait_event(mddev->sb_wait, atomic_read(&mddev->pending_writes)==0);
768 int sync_page_io(struct md_rdev *rdev, sector_t sector, int size,
769 struct page *page, int rw, bool metadata_op)
771 struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, rdev->mddev);
774 bio->bi_bdev = (metadata_op && rdev->meta_bdev) ?
775 rdev->meta_bdev : rdev->bdev;
777 bio->bi_iter.bi_sector = sector + rdev->sb_start;
778 else if (rdev->mddev->reshape_position != MaxSector &&
779 (rdev->mddev->reshape_backwards ==
780 (sector >= rdev->mddev->reshape_position)))
781 bio->bi_iter.bi_sector = sector + rdev->new_data_offset;
783 bio->bi_iter.bi_sector = sector + rdev->data_offset;
784 bio_add_page(bio, page, size, 0);
785 submit_bio_wait(rw, bio);
787 ret = !bio->bi_error;
791 EXPORT_SYMBOL_GPL(sync_page_io);
793 static int read_disk_sb(struct md_rdev *rdev, int size)
795 char b[BDEVNAME_SIZE];
800 if (!sync_page_io(rdev, 0, size, rdev->sb_page, READ, true))
806 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
807 bdevname(rdev->bdev,b));
811 static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
813 return sb1->set_uuid0 == sb2->set_uuid0 &&
814 sb1->set_uuid1 == sb2->set_uuid1 &&
815 sb1->set_uuid2 == sb2->set_uuid2 &&
816 sb1->set_uuid3 == sb2->set_uuid3;
819 static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
822 mdp_super_t *tmp1, *tmp2;
824 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
825 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
827 if (!tmp1 || !tmp2) {
829 printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n");
837 * nr_disks is not constant
842 ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0);
849 static u32 md_csum_fold(u32 csum)
851 csum = (csum & 0xffff) + (csum >> 16);
852 return (csum & 0xffff) + (csum >> 16);
855 static unsigned int calc_sb_csum(mdp_super_t *sb)
858 u32 *sb32 = (u32*)sb;
860 unsigned int disk_csum, csum;
862 disk_csum = sb->sb_csum;
865 for (i = 0; i < MD_SB_BYTES/4 ; i++)
867 csum = (newcsum & 0xffffffff) + (newcsum>>32);
870 /* This used to use csum_partial, which was wrong for several
871 * reasons including that different results are returned on
872 * different architectures. It isn't critical that we get exactly
873 * the same return value as before (we always csum_fold before
874 * testing, and that removes any differences). However as we
875 * know that csum_partial always returned a 16bit value on
876 * alphas, do a fold to maximise conformity to previous behaviour.
878 sb->sb_csum = md_csum_fold(disk_csum);
880 sb->sb_csum = disk_csum;
886 * Handle superblock details.
887 * We want to be able to handle multiple superblock formats
888 * so we have a common interface to them all, and an array of
889 * different handlers.
890 * We rely on user-space to write the initial superblock, and support
891 * reading and updating of superblocks.
892 * Interface methods are:
893 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version)
894 * loads and validates a superblock on dev.
895 * if refdev != NULL, compare superblocks on both devices
897 * 0 - dev has a superblock that is compatible with refdev
898 * 1 - dev has a superblock that is compatible and newer than refdev
899 * so dev should be used as the refdev in future
900 * -EINVAL superblock incompatible or invalid
901 * -othererror e.g. -EIO
903 * int validate_super(struct mddev *mddev, struct md_rdev *dev)
904 * Verify that dev is acceptable into mddev.
905 * The first time, mddev->raid_disks will be 0, and data from
906 * dev should be merged in. Subsequent calls check that dev
907 * is new enough. Return 0 or -EINVAL
909 * void sync_super(struct mddev *mddev, struct md_rdev *dev)
910 * Update the superblock for rdev with data in mddev
911 * This does not write to disc.
917 struct module *owner;
918 int (*load_super)(struct md_rdev *rdev,
919 struct md_rdev *refdev,
921 int (*validate_super)(struct mddev *mddev,
922 struct md_rdev *rdev);
923 void (*sync_super)(struct mddev *mddev,
924 struct md_rdev *rdev);
925 unsigned long long (*rdev_size_change)(struct md_rdev *rdev,
926 sector_t num_sectors);
927 int (*allow_new_offset)(struct md_rdev *rdev,
928 unsigned long long new_offset);
932 * Check that the given mddev has no bitmap.
934 * This function is called from the run method of all personalities that do not
935 * support bitmaps. It prints an error message and returns non-zero if mddev
936 * has a bitmap. Otherwise, it returns 0.
939 int md_check_no_bitmap(struct mddev *mddev)
941 if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset)
943 printk(KERN_ERR "%s: bitmaps are not supported for %s\n",
944 mdname(mddev), mddev->pers->name);
947 EXPORT_SYMBOL(md_check_no_bitmap);
950 * load_super for 0.90.0
952 static int super_90_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
954 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
959 * Calculate the position of the superblock (512byte sectors),
960 * it's at the end of the disk.
962 * It also happens to be a multiple of 4Kb.
964 rdev->sb_start = calc_dev_sboffset(rdev);
966 ret = read_disk_sb(rdev, MD_SB_BYTES);
971 bdevname(rdev->bdev, b);
972 sb = page_address(rdev->sb_page);
974 if (sb->md_magic != MD_SB_MAGIC) {
975 printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
980 if (sb->major_version != 0 ||
981 sb->minor_version < 90 ||
982 sb->minor_version > 91) {
983 printk(KERN_WARNING "Bad version number %d.%d on %s\n",
984 sb->major_version, sb->minor_version,
989 if (sb->raid_disks <= 0)
992 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
993 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
998 rdev->preferred_minor = sb->md_minor;
999 rdev->data_offset = 0;
1000 rdev->new_data_offset = 0;
1001 rdev->sb_size = MD_SB_BYTES;
1002 rdev->badblocks.shift = -1;
1004 if (sb->level == LEVEL_MULTIPATH)
1007 rdev->desc_nr = sb->this_disk.number;
1013 mdp_super_t *refsb = page_address(refdev->sb_page);
1014 if (!uuid_equal(refsb, sb)) {
1015 printk(KERN_WARNING "md: %s has different UUID to %s\n",
1016 b, bdevname(refdev->bdev,b2));
1019 if (!sb_equal(refsb, sb)) {
1020 printk(KERN_WARNING "md: %s has same UUID"
1021 " but different superblock to %s\n",
1022 b, bdevname(refdev->bdev, b2));
1026 ev2 = md_event(refsb);
1032 rdev->sectors = rdev->sb_start;
1033 /* Limit to 4TB as metadata cannot record more than that.
1034 * (not needed for Linear and RAID0 as metadata doesn't
1037 if (IS_ENABLED(CONFIG_LBDAF) && (u64)rdev->sectors >= (2ULL << 32) &&
1039 rdev->sectors = (sector_t)(2ULL << 32) - 2;
1041 if (rdev->sectors < ((sector_t)sb->size) * 2 && sb->level >= 1)
1042 /* "this cannot possibly happen" ... */
1050 * validate_super for 0.90.0
1052 static int super_90_validate(struct mddev *mddev, struct md_rdev *rdev)
1055 mdp_super_t *sb = page_address(rdev->sb_page);
1056 __u64 ev1 = md_event(sb);
1058 rdev->raid_disk = -1;
1059 clear_bit(Faulty, &rdev->flags);
1060 clear_bit(In_sync, &rdev->flags);
1061 clear_bit(Bitmap_sync, &rdev->flags);
1062 clear_bit(WriteMostly, &rdev->flags);
1064 if (mddev->raid_disks == 0) {
1065 mddev->major_version = 0;
1066 mddev->minor_version = sb->minor_version;
1067 mddev->patch_version = sb->patch_version;
1068 mddev->external = 0;
1069 mddev->chunk_sectors = sb->chunk_size >> 9;
1070 mddev->ctime = sb->ctime;
1071 mddev->utime = sb->utime;
1072 mddev->level = sb->level;
1073 mddev->clevel[0] = 0;
1074 mddev->layout = sb->layout;
1075 mddev->raid_disks = sb->raid_disks;
1076 mddev->dev_sectors = ((sector_t)sb->size) * 2;
1077 mddev->events = ev1;
1078 mddev->bitmap_info.offset = 0;
1079 mddev->bitmap_info.space = 0;
1080 /* bitmap can use 60 K after the 4K superblocks */
1081 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
1082 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
1083 mddev->reshape_backwards = 0;
1085 if (mddev->minor_version >= 91) {
1086 mddev->reshape_position = sb->reshape_position;
1087 mddev->delta_disks = sb->delta_disks;
1088 mddev->new_level = sb->new_level;
1089 mddev->new_layout = sb->new_layout;
1090 mddev->new_chunk_sectors = sb->new_chunk >> 9;
1091 if (mddev->delta_disks < 0)
1092 mddev->reshape_backwards = 1;
1094 mddev->reshape_position = MaxSector;
1095 mddev->delta_disks = 0;
1096 mddev->new_level = mddev->level;
1097 mddev->new_layout = mddev->layout;
1098 mddev->new_chunk_sectors = mddev->chunk_sectors;
1101 if (sb->state & (1<<MD_SB_CLEAN))
1102 mddev->recovery_cp = MaxSector;
1104 if (sb->events_hi == sb->cp_events_hi &&
1105 sb->events_lo == sb->cp_events_lo) {
1106 mddev->recovery_cp = sb->recovery_cp;
1108 mddev->recovery_cp = 0;
1111 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
1112 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
1113 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
1114 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
1116 mddev->max_disks = MD_SB_DISKS;
1118 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
1119 mddev->bitmap_info.file == NULL) {
1120 mddev->bitmap_info.offset =
1121 mddev->bitmap_info.default_offset;
1122 mddev->bitmap_info.space =
1123 mddev->bitmap_info.default_space;
1126 } else if (mddev->pers == NULL) {
1127 /* Insist on good event counter while assembling, except
1128 * for spares (which don't need an event count) */
1130 if (sb->disks[rdev->desc_nr].state & (
1131 (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE)))
1132 if (ev1 < mddev->events)
1134 } else if (mddev->bitmap) {
1135 /* if adding to array with a bitmap, then we can accept an
1136 * older device ... but not too old.
1138 if (ev1 < mddev->bitmap->events_cleared)
1140 if (ev1 < mddev->events)
1141 set_bit(Bitmap_sync, &rdev->flags);
1143 if (ev1 < mddev->events)
1144 /* just a hot-add of a new device, leave raid_disk at -1 */
1148 if (mddev->level != LEVEL_MULTIPATH) {
1149 desc = sb->disks + rdev->desc_nr;
1151 if (desc->state & (1<<MD_DISK_FAULTY))
1152 set_bit(Faulty, &rdev->flags);
1153 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
1154 desc->raid_disk < mddev->raid_disks */) {
1155 set_bit(In_sync, &rdev->flags);
1156 rdev->raid_disk = desc->raid_disk;
1157 rdev->saved_raid_disk = desc->raid_disk;
1158 } else if (desc->state & (1<<MD_DISK_ACTIVE)) {
1159 /* active but not in sync implies recovery up to
1160 * reshape position. We don't know exactly where
1161 * that is, so set to zero for now */
1162 if (mddev->minor_version >= 91) {
1163 rdev->recovery_offset = 0;
1164 rdev->raid_disk = desc->raid_disk;
1167 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
1168 set_bit(WriteMostly, &rdev->flags);
1169 } else /* MULTIPATH are always insync */
1170 set_bit(In_sync, &rdev->flags);
1175 * sync_super for 0.90.0
1177 static void super_90_sync(struct mddev *mddev, struct md_rdev *rdev)
1180 struct md_rdev *rdev2;
1181 int next_spare = mddev->raid_disks;
1183 /* make rdev->sb match mddev data..
1186 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1187 * 3/ any empty disks < next_spare become removed
1189 * disks[0] gets initialised to REMOVED because
1190 * we cannot be sure from other fields if it has
1191 * been initialised or not.
1194 int active=0, working=0,failed=0,spare=0,nr_disks=0;
1196 rdev->sb_size = MD_SB_BYTES;
1198 sb = page_address(rdev->sb_page);
1200 memset(sb, 0, sizeof(*sb));
1202 sb->md_magic = MD_SB_MAGIC;
1203 sb->major_version = mddev->major_version;
1204 sb->patch_version = mddev->patch_version;
1205 sb->gvalid_words = 0; /* ignored */
1206 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
1207 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
1208 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
1209 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
1211 sb->ctime = mddev->ctime;
1212 sb->level = mddev->level;
1213 sb->size = mddev->dev_sectors / 2;
1214 sb->raid_disks = mddev->raid_disks;
1215 sb->md_minor = mddev->md_minor;
1216 sb->not_persistent = 0;
1217 sb->utime = mddev->utime;
1219 sb->events_hi = (mddev->events>>32);
1220 sb->events_lo = (u32)mddev->events;
1222 if (mddev->reshape_position == MaxSector)
1223 sb->minor_version = 90;
1225 sb->minor_version = 91;
1226 sb->reshape_position = mddev->reshape_position;
1227 sb->new_level = mddev->new_level;
1228 sb->delta_disks = mddev->delta_disks;
1229 sb->new_layout = mddev->new_layout;
1230 sb->new_chunk = mddev->new_chunk_sectors << 9;
1232 mddev->minor_version = sb->minor_version;
1235 sb->recovery_cp = mddev->recovery_cp;
1236 sb->cp_events_hi = (mddev->events>>32);
1237 sb->cp_events_lo = (u32)mddev->events;
1238 if (mddev->recovery_cp == MaxSector)
1239 sb->state = (1<< MD_SB_CLEAN);
1241 sb->recovery_cp = 0;
1243 sb->layout = mddev->layout;
1244 sb->chunk_size = mddev->chunk_sectors << 9;
1246 if (mddev->bitmap && mddev->bitmap_info.file == NULL)
1247 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
1249 sb->disks[0].state = (1<<MD_DISK_REMOVED);
1250 rdev_for_each(rdev2, mddev) {
1253 int is_active = test_bit(In_sync, &rdev2->flags);
1255 if (rdev2->raid_disk >= 0 &&
1256 sb->minor_version >= 91)
1257 /* we have nowhere to store the recovery_offset,
1258 * but if it is not below the reshape_position,
1259 * we can piggy-back on that.
1262 if (rdev2->raid_disk < 0 ||
1263 test_bit(Faulty, &rdev2->flags))
1266 desc_nr = rdev2->raid_disk;
1268 desc_nr = next_spare++;
1269 rdev2->desc_nr = desc_nr;
1270 d = &sb->disks[rdev2->desc_nr];
1272 d->number = rdev2->desc_nr;
1273 d->major = MAJOR(rdev2->bdev->bd_dev);
1274 d->minor = MINOR(rdev2->bdev->bd_dev);
1276 d->raid_disk = rdev2->raid_disk;
1278 d->raid_disk = rdev2->desc_nr; /* compatibility */
1279 if (test_bit(Faulty, &rdev2->flags))
1280 d->state = (1<<MD_DISK_FAULTY);
1281 else if (is_active) {
1282 d->state = (1<<MD_DISK_ACTIVE);
1283 if (test_bit(In_sync, &rdev2->flags))
1284 d->state |= (1<<MD_DISK_SYNC);
1292 if (test_bit(WriteMostly, &rdev2->flags))
1293 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1295 /* now set the "removed" and "faulty" bits on any missing devices */
1296 for (i=0 ; i < mddev->raid_disks ; i++) {
1297 mdp_disk_t *d = &sb->disks[i];
1298 if (d->state == 0 && d->number == 0) {
1301 d->state = (1<<MD_DISK_REMOVED);
1302 d->state |= (1<<MD_DISK_FAULTY);
1306 sb->nr_disks = nr_disks;
1307 sb->active_disks = active;
1308 sb->working_disks = working;
1309 sb->failed_disks = failed;
1310 sb->spare_disks = spare;
1312 sb->this_disk = sb->disks[rdev->desc_nr];
1313 sb->sb_csum = calc_sb_csum(sb);
1317 * rdev_size_change for 0.90.0
1319 static unsigned long long
1320 super_90_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
1322 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1323 return 0; /* component must fit device */
1324 if (rdev->mddev->bitmap_info.offset)
1325 return 0; /* can't move bitmap */
1326 rdev->sb_start = calc_dev_sboffset(rdev);
1327 if (!num_sectors || num_sectors > rdev->sb_start)
1328 num_sectors = rdev->sb_start;
1329 /* Limit to 4TB as metadata cannot record more than that.
1330 * 4TB == 2^32 KB, or 2*2^32 sectors.
1332 if (IS_ENABLED(CONFIG_LBDAF) && (u64)num_sectors >= (2ULL << 32) &&
1333 rdev->mddev->level >= 1)
1334 num_sectors = (sector_t)(2ULL << 32) - 2;
1335 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1337 md_super_wait(rdev->mddev);
1342 super_90_allow_new_offset(struct md_rdev *rdev, unsigned long long new_offset)
1344 /* non-zero offset changes not possible with v0.90 */
1345 return new_offset == 0;
1349 * version 1 superblock
1352 static __le32 calc_sb_1_csum(struct mdp_superblock_1 *sb)
1356 unsigned long long newcsum;
1357 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1358 __le32 *isuper = (__le32*)sb;
1360 disk_csum = sb->sb_csum;
1363 for (; size >= 4; size -= 4)
1364 newcsum += le32_to_cpu(*isuper++);
1367 newcsum += le16_to_cpu(*(__le16*) isuper);
1369 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1370 sb->sb_csum = disk_csum;
1371 return cpu_to_le32(csum);
1374 static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors,
1376 static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
1378 struct mdp_superblock_1 *sb;
1382 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1386 * Calculate the position of the superblock in 512byte sectors.
1387 * It is always aligned to a 4K boundary and
1388 * depeding on minor_version, it can be:
1389 * 0: At least 8K, but less than 12K, from end of device
1390 * 1: At start of device
1391 * 2: 4K from start of device.
1393 switch(minor_version) {
1395 sb_start = i_size_read(rdev->bdev->bd_inode) >> 9;
1397 sb_start &= ~(sector_t)(4*2-1);
1408 rdev->sb_start = sb_start;
1410 /* superblock is rarely larger than 1K, but it can be larger,
1411 * and it is safe to read 4k, so we do that
1413 ret = read_disk_sb(rdev, 4096);
1414 if (ret) return ret;
1416 sb = page_address(rdev->sb_page);
1418 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1419 sb->major_version != cpu_to_le32(1) ||
1420 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1421 le64_to_cpu(sb->super_offset) != rdev->sb_start ||
1422 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1425 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1426 printk("md: invalid superblock checksum on %s\n",
1427 bdevname(rdev->bdev,b));
1430 if (le64_to_cpu(sb->data_size) < 10) {
1431 printk("md: data_size too small on %s\n",
1432 bdevname(rdev->bdev,b));
1437 memcmp(sb->pad3, sb->pad3+1, sizeof(sb->pad3) - sizeof(sb->pad3[1])))
1438 /* Some padding is non-zero, might be a new feature */
1441 rdev->preferred_minor = 0xffff;
1442 rdev->data_offset = le64_to_cpu(sb->data_offset);
1443 rdev->new_data_offset = rdev->data_offset;
1444 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE) &&
1445 (le32_to_cpu(sb->feature_map) & MD_FEATURE_NEW_OFFSET))
1446 rdev->new_data_offset += (s32)le32_to_cpu(sb->new_offset);
1447 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1449 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1450 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1451 if (rdev->sb_size & bmask)
1452 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1455 && rdev->data_offset < sb_start + (rdev->sb_size/512))
1458 && rdev->new_data_offset < sb_start + (rdev->sb_size/512))
1461 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1464 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1466 if (!rdev->bb_page) {
1467 rdev->bb_page = alloc_page(GFP_KERNEL);
1471 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BAD_BLOCKS) &&
1472 rdev->badblocks.count == 0) {
1473 /* need to load the bad block list.
1474 * Currently we limit it to one page.
1480 int sectors = le16_to_cpu(sb->bblog_size);
1481 if (sectors > (PAGE_SIZE / 512))
1483 offset = le32_to_cpu(sb->bblog_offset);
1486 bb_sector = (long long)offset;
1487 if (!sync_page_io(rdev, bb_sector, sectors << 9,
1488 rdev->bb_page, READ, true))
1490 bbp = (u64 *)page_address(rdev->bb_page);
1491 rdev->badblocks.shift = sb->bblog_shift;
1492 for (i = 0 ; i < (sectors << (9-3)) ; i++, bbp++) {
1493 u64 bb = le64_to_cpu(*bbp);
1494 int count = bb & (0x3ff);
1495 u64 sector = bb >> 10;
1496 sector <<= sb->bblog_shift;
1497 count <<= sb->bblog_shift;
1500 if (md_set_badblocks(&rdev->badblocks,
1501 sector, count, 1) == 0)
1504 } else if (sb->bblog_offset != 0)
1505 rdev->badblocks.shift = 0;
1511 struct mdp_superblock_1 *refsb = page_address(refdev->sb_page);
1513 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1514 sb->level != refsb->level ||
1515 sb->layout != refsb->layout ||
1516 sb->chunksize != refsb->chunksize) {
1517 printk(KERN_WARNING "md: %s has strangely different"
1518 " superblock to %s\n",
1519 bdevname(rdev->bdev,b),
1520 bdevname(refdev->bdev,b2));
1523 ev1 = le64_to_cpu(sb->events);
1524 ev2 = le64_to_cpu(refsb->events);
1531 if (minor_version) {
1532 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9);
1533 sectors -= rdev->data_offset;
1535 sectors = rdev->sb_start;
1536 if (sectors < le64_to_cpu(sb->data_size))
1538 rdev->sectors = le64_to_cpu(sb->data_size);
1542 static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev)
1544 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
1545 __u64 ev1 = le64_to_cpu(sb->events);
1547 rdev->raid_disk = -1;
1548 clear_bit(Faulty, &rdev->flags);
1549 clear_bit(In_sync, &rdev->flags);
1550 clear_bit(Bitmap_sync, &rdev->flags);
1551 clear_bit(WriteMostly, &rdev->flags);
1553 if (mddev->raid_disks == 0) {
1554 mddev->major_version = 1;
1555 mddev->patch_version = 0;
1556 mddev->external = 0;
1557 mddev->chunk_sectors = le32_to_cpu(sb->chunksize);
1558 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1559 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1560 mddev->level = le32_to_cpu(sb->level);
1561 mddev->clevel[0] = 0;
1562 mddev->layout = le32_to_cpu(sb->layout);
1563 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1564 mddev->dev_sectors = le64_to_cpu(sb->size);
1565 mddev->events = ev1;
1566 mddev->bitmap_info.offset = 0;
1567 mddev->bitmap_info.space = 0;
1568 /* Default location for bitmap is 1K after superblock
1569 * using 3K - total of 4K
1571 mddev->bitmap_info.default_offset = 1024 >> 9;
1572 mddev->bitmap_info.default_space = (4096-1024) >> 9;
1573 mddev->reshape_backwards = 0;
1575 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1576 memcpy(mddev->uuid, sb->set_uuid, 16);
1578 mddev->max_disks = (4096-256)/2;
1580 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1581 mddev->bitmap_info.file == NULL) {
1582 mddev->bitmap_info.offset =
1583 (__s32)le32_to_cpu(sb->bitmap_offset);
1584 /* Metadata doesn't record how much space is available.
1585 * For 1.0, we assume we can use up to the superblock
1586 * if before, else to 4K beyond superblock.
1587 * For others, assume no change is possible.
1589 if (mddev->minor_version > 0)
1590 mddev->bitmap_info.space = 0;
1591 else if (mddev->bitmap_info.offset > 0)
1592 mddev->bitmap_info.space =
1593 8 - mddev->bitmap_info.offset;
1595 mddev->bitmap_info.space =
1596 -mddev->bitmap_info.offset;
1599 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1600 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1601 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1602 mddev->new_level = le32_to_cpu(sb->new_level);
1603 mddev->new_layout = le32_to_cpu(sb->new_layout);
1604 mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk);
1605 if (mddev->delta_disks < 0 ||
1606 (mddev->delta_disks == 0 &&
1607 (le32_to_cpu(sb->feature_map)
1608 & MD_FEATURE_RESHAPE_BACKWARDS)))
1609 mddev->reshape_backwards = 1;
1611 mddev->reshape_position = MaxSector;
1612 mddev->delta_disks = 0;
1613 mddev->new_level = mddev->level;
1614 mddev->new_layout = mddev->layout;
1615 mddev->new_chunk_sectors = mddev->chunk_sectors;
1618 } else if (mddev->pers == NULL) {
1619 /* Insist of good event counter while assembling, except for
1620 * spares (which don't need an event count) */
1622 if (rdev->desc_nr >= 0 &&
1623 rdev->desc_nr < le32_to_cpu(sb->max_dev) &&
1624 (le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < MD_DISK_ROLE_MAX ||
1625 le16_to_cpu(sb->dev_roles[rdev->desc_nr]) == MD_DISK_ROLE_JOURNAL))
1626 if (ev1 < mddev->events)
1628 } else if (mddev->bitmap) {
1629 /* If adding to array with a bitmap, then we can accept an
1630 * older device, but not too old.
1632 if (ev1 < mddev->bitmap->events_cleared)
1634 if (ev1 < mddev->events)
1635 set_bit(Bitmap_sync, &rdev->flags);
1637 if (ev1 < mddev->events)
1638 /* just a hot-add of a new device, leave raid_disk at -1 */
1641 if (mddev->level != LEVEL_MULTIPATH) {
1643 if (rdev->desc_nr < 0 ||
1644 rdev->desc_nr >= le32_to_cpu(sb->max_dev)) {
1645 role = MD_DISK_ROLE_SPARE;
1648 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1650 case MD_DISK_ROLE_SPARE: /* spare */
1652 case MD_DISK_ROLE_FAULTY: /* faulty */
1653 set_bit(Faulty, &rdev->flags);
1655 case MD_DISK_ROLE_JOURNAL: /* journal device */
1656 if (!(le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL)) {
1657 /* journal device without journal feature */
1659 "md: journal device provided without journal feature, ignoring the device\n");
1662 set_bit(Journal, &rdev->flags);
1663 rdev->journal_tail = le64_to_cpu(sb->journal_tail);
1664 if (mddev->recovery_cp == MaxSector)
1665 set_bit(MD_JOURNAL_CLEAN, &mddev->flags);
1666 rdev->raid_disk = 0;
1669 rdev->saved_raid_disk = role;
1670 if ((le32_to_cpu(sb->feature_map) &
1671 MD_FEATURE_RECOVERY_OFFSET)) {
1672 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1673 if (!(le32_to_cpu(sb->feature_map) &
1674 MD_FEATURE_RECOVERY_BITMAP))
1675 rdev->saved_raid_disk = -1;
1678 * If the array is FROZEN, then the device can't
1679 * be in_sync with rest of array.
1681 if (!test_bit(MD_RECOVERY_FROZEN,
1683 set_bit(In_sync, &rdev->flags);
1685 rdev->raid_disk = role;
1688 if (sb->devflags & WriteMostly1)
1689 set_bit(WriteMostly, &rdev->flags);
1690 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_REPLACEMENT)
1691 set_bit(Replacement, &rdev->flags);
1692 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL)
1693 set_bit(MD_HAS_JOURNAL, &mddev->flags);
1694 } else /* MULTIPATH are always insync */
1695 set_bit(In_sync, &rdev->flags);
1700 static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev)
1702 struct mdp_superblock_1 *sb;
1703 struct md_rdev *rdev2;
1705 /* make rdev->sb match mddev and rdev data. */
1707 sb = page_address(rdev->sb_page);
1709 sb->feature_map = 0;
1711 sb->recovery_offset = cpu_to_le64(0);
1712 memset(sb->pad3, 0, sizeof(sb->pad3));
1714 sb->utime = cpu_to_le64((__u64)mddev->utime);
1715 sb->events = cpu_to_le64(mddev->events);
1717 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1718 else if (test_bit(MD_JOURNAL_CLEAN, &mddev->flags))
1719 sb->resync_offset = cpu_to_le64(MaxSector);
1721 sb->resync_offset = cpu_to_le64(0);
1723 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
1725 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
1726 sb->size = cpu_to_le64(mddev->dev_sectors);
1727 sb->chunksize = cpu_to_le32(mddev->chunk_sectors);
1728 sb->level = cpu_to_le32(mddev->level);
1729 sb->layout = cpu_to_le32(mddev->layout);
1731 if (test_bit(WriteMostly, &rdev->flags))
1732 sb->devflags |= WriteMostly1;
1734 sb->devflags &= ~WriteMostly1;
1735 sb->data_offset = cpu_to_le64(rdev->data_offset);
1736 sb->data_size = cpu_to_le64(rdev->sectors);
1738 if (mddev->bitmap && mddev->bitmap_info.file == NULL) {
1739 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset);
1740 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
1743 if (rdev->raid_disk >= 0 && !test_bit(Journal, &rdev->flags) &&
1744 !test_bit(In_sync, &rdev->flags)) {
1746 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1747 sb->recovery_offset =
1748 cpu_to_le64(rdev->recovery_offset);
1749 if (rdev->saved_raid_disk >= 0 && mddev->bitmap)
1751 cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP);
1753 /* Note: recovery_offset and journal_tail share space */
1754 if (test_bit(Journal, &rdev->flags))
1755 sb->journal_tail = cpu_to_le64(rdev->journal_tail);
1756 if (test_bit(Replacement, &rdev->flags))
1758 cpu_to_le32(MD_FEATURE_REPLACEMENT);
1760 if (mddev->reshape_position != MaxSector) {
1761 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1762 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1763 sb->new_layout = cpu_to_le32(mddev->new_layout);
1764 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1765 sb->new_level = cpu_to_le32(mddev->new_level);
1766 sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors);
1767 if (mddev->delta_disks == 0 &&
1768 mddev->reshape_backwards)
1770 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS);
1771 if (rdev->new_data_offset != rdev->data_offset) {
1773 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET);
1774 sb->new_offset = cpu_to_le32((__u32)(rdev->new_data_offset
1775 - rdev->data_offset));
1779 if (mddev_is_clustered(mddev))
1780 sb->feature_map |= cpu_to_le32(MD_FEATURE_CLUSTERED);
1782 if (rdev->badblocks.count == 0)
1783 /* Nothing to do for bad blocks*/ ;
1784 else if (sb->bblog_offset == 0)
1785 /* Cannot record bad blocks on this device */
1786 md_error(mddev, rdev);
1788 struct badblocks *bb = &rdev->badblocks;
1789 u64 *bbp = (u64 *)page_address(rdev->bb_page);
1791 sb->feature_map |= cpu_to_le32(MD_FEATURE_BAD_BLOCKS);
1796 seq = read_seqbegin(&bb->lock);
1798 memset(bbp, 0xff, PAGE_SIZE);
1800 for (i = 0 ; i < bb->count ; i++) {
1801 u64 internal_bb = p[i];
1802 u64 store_bb = ((BB_OFFSET(internal_bb) << 10)
1803 | BB_LEN(internal_bb));
1804 bbp[i] = cpu_to_le64(store_bb);
1807 if (read_seqretry(&bb->lock, seq))
1810 bb->sector = (rdev->sb_start +
1811 (int)le32_to_cpu(sb->bblog_offset));
1812 bb->size = le16_to_cpu(sb->bblog_size);
1817 rdev_for_each(rdev2, mddev)
1818 if (rdev2->desc_nr+1 > max_dev)
1819 max_dev = rdev2->desc_nr+1;
1821 if (max_dev > le32_to_cpu(sb->max_dev)) {
1823 sb->max_dev = cpu_to_le32(max_dev);
1824 rdev->sb_size = max_dev * 2 + 256;
1825 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1826 if (rdev->sb_size & bmask)
1827 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1829 max_dev = le32_to_cpu(sb->max_dev);
1831 for (i=0; i<max_dev;i++)
1832 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_FAULTY);
1834 if (test_bit(MD_HAS_JOURNAL, &mddev->flags))
1835 sb->feature_map |= cpu_to_le32(MD_FEATURE_JOURNAL);
1837 rdev_for_each(rdev2, mddev) {
1839 if (test_bit(Faulty, &rdev2->flags))
1840 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_FAULTY);
1841 else if (test_bit(In_sync, &rdev2->flags))
1842 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1843 else if (test_bit(Journal, &rdev2->flags))
1844 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_JOURNAL);
1845 else if (rdev2->raid_disk >= 0)
1846 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1848 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_SPARE);
1851 sb->sb_csum = calc_sb_1_csum(sb);
1854 static unsigned long long
1855 super_1_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
1857 struct mdp_superblock_1 *sb;
1858 sector_t max_sectors;
1859 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1860 return 0; /* component must fit device */
1861 if (rdev->data_offset != rdev->new_data_offset)
1862 return 0; /* too confusing */
1863 if (rdev->sb_start < rdev->data_offset) {
1864 /* minor versions 1 and 2; superblock before data */
1865 max_sectors = i_size_read(rdev->bdev->bd_inode) >> 9;
1866 max_sectors -= rdev->data_offset;
1867 if (!num_sectors || num_sectors > max_sectors)
1868 num_sectors = max_sectors;
1869 } else if (rdev->mddev->bitmap_info.offset) {
1870 /* minor version 0 with bitmap we can't move */
1873 /* minor version 0; superblock after data */
1875 sb_start = (i_size_read(rdev->bdev->bd_inode) >> 9) - 8*2;
1876 sb_start &= ~(sector_t)(4*2 - 1);
1877 max_sectors = rdev->sectors + sb_start - rdev->sb_start;
1878 if (!num_sectors || num_sectors > max_sectors)
1879 num_sectors = max_sectors;
1880 rdev->sb_start = sb_start;
1882 sb = page_address(rdev->sb_page);
1883 sb->data_size = cpu_to_le64(num_sectors);
1884 sb->super_offset = cpu_to_le64(rdev->sb_start);
1885 sb->sb_csum = calc_sb_1_csum(sb);
1886 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1888 md_super_wait(rdev->mddev);
1894 super_1_allow_new_offset(struct md_rdev *rdev,
1895 unsigned long long new_offset)
1897 /* All necessary checks on new >= old have been done */
1898 struct bitmap *bitmap;
1899 if (new_offset >= rdev->data_offset)
1902 /* with 1.0 metadata, there is no metadata to tread on
1903 * so we can always move back */
1904 if (rdev->mddev->minor_version == 0)
1907 /* otherwise we must be sure not to step on
1908 * any metadata, so stay:
1909 * 36K beyond start of superblock
1910 * beyond end of badblocks
1911 * beyond write-intent bitmap
1913 if (rdev->sb_start + (32+4)*2 > new_offset)
1915 bitmap = rdev->mddev->bitmap;
1916 if (bitmap && !rdev->mddev->bitmap_info.file &&
1917 rdev->sb_start + rdev->mddev->bitmap_info.offset +
1918 bitmap->storage.file_pages * (PAGE_SIZE>>9) > new_offset)
1920 if (rdev->badblocks.sector + rdev->badblocks.size > new_offset)
1926 static struct super_type super_types[] = {
1929 .owner = THIS_MODULE,
1930 .load_super = super_90_load,
1931 .validate_super = super_90_validate,
1932 .sync_super = super_90_sync,
1933 .rdev_size_change = super_90_rdev_size_change,
1934 .allow_new_offset = super_90_allow_new_offset,
1938 .owner = THIS_MODULE,
1939 .load_super = super_1_load,
1940 .validate_super = super_1_validate,
1941 .sync_super = super_1_sync,
1942 .rdev_size_change = super_1_rdev_size_change,
1943 .allow_new_offset = super_1_allow_new_offset,
1947 static void sync_super(struct mddev *mddev, struct md_rdev *rdev)
1949 if (mddev->sync_super) {
1950 mddev->sync_super(mddev, rdev);
1954 BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types));
1956 super_types[mddev->major_version].sync_super(mddev, rdev);
1959 static int match_mddev_units(struct mddev *mddev1, struct mddev *mddev2)
1961 struct md_rdev *rdev, *rdev2;
1964 rdev_for_each_rcu(rdev, mddev1) {
1965 if (test_bit(Faulty, &rdev->flags) ||
1966 test_bit(Journal, &rdev->flags) ||
1967 rdev->raid_disk == -1)
1969 rdev_for_each_rcu(rdev2, mddev2) {
1970 if (test_bit(Faulty, &rdev2->flags) ||
1971 test_bit(Journal, &rdev2->flags) ||
1972 rdev2->raid_disk == -1)
1974 if (rdev->bdev->bd_contains ==
1975 rdev2->bdev->bd_contains) {
1985 static LIST_HEAD(pending_raid_disks);
1988 * Try to register data integrity profile for an mddev
1990 * This is called when an array is started and after a disk has been kicked
1991 * from the array. It only succeeds if all working and active component devices
1992 * are integrity capable with matching profiles.
1994 int md_integrity_register(struct mddev *mddev)
1996 struct md_rdev *rdev, *reference = NULL;
1998 if (list_empty(&mddev->disks))
1999 return 0; /* nothing to do */
2000 if (!mddev->gendisk || blk_get_integrity(mddev->gendisk))
2001 return 0; /* shouldn't register, or already is */
2002 rdev_for_each(rdev, mddev) {
2003 /* skip spares and non-functional disks */
2004 if (test_bit(Faulty, &rdev->flags))
2006 if (rdev->raid_disk < 0)
2009 /* Use the first rdev as the reference */
2013 /* does this rdev's profile match the reference profile? */
2014 if (blk_integrity_compare(reference->bdev->bd_disk,
2015 rdev->bdev->bd_disk) < 0)
2018 if (!reference || !bdev_get_integrity(reference->bdev))
2021 * All component devices are integrity capable and have matching
2022 * profiles, register the common profile for the md device.
2024 blk_integrity_register(mddev->gendisk,
2025 bdev_get_integrity(reference->bdev));
2027 printk(KERN_NOTICE "md: data integrity enabled on %s\n", mdname(mddev));
2028 if (bioset_integrity_create(mddev->bio_set, BIO_POOL_SIZE)) {
2029 printk(KERN_ERR "md: failed to create integrity pool for %s\n",
2035 EXPORT_SYMBOL(md_integrity_register);
2038 * Attempt to add an rdev, but only if it is consistent with the current
2041 int md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev)
2043 struct blk_integrity *bi_rdev;
2044 struct blk_integrity *bi_mddev;
2045 char name[BDEVNAME_SIZE];
2047 if (!mddev->gendisk)
2050 bi_rdev = bdev_get_integrity(rdev->bdev);
2051 bi_mddev = blk_get_integrity(mddev->gendisk);
2053 if (!bi_mddev) /* nothing to do */
2056 if (blk_integrity_compare(mddev->gendisk, rdev->bdev->bd_disk) != 0) {
2057 printk(KERN_NOTICE "%s: incompatible integrity profile for %s\n",
2058 mdname(mddev), bdevname(rdev->bdev, name));
2064 EXPORT_SYMBOL(md_integrity_add_rdev);
2066 static int bind_rdev_to_array(struct md_rdev *rdev, struct mddev *mddev)
2068 char b[BDEVNAME_SIZE];
2072 /* prevent duplicates */
2073 if (find_rdev(mddev, rdev->bdev->bd_dev))
2076 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2077 if (rdev->sectors && (mddev->dev_sectors == 0 ||
2078 rdev->sectors < mddev->dev_sectors)) {
2080 /* Cannot change size, so fail
2081 * If mddev->level <= 0, then we don't care
2082 * about aligning sizes (e.g. linear)
2084 if (mddev->level > 0)
2087 mddev->dev_sectors = rdev->sectors;
2090 /* Verify rdev->desc_nr is unique.
2091 * If it is -1, assign a free number, else
2092 * check number is not in use
2095 if (rdev->desc_nr < 0) {
2098 choice = mddev->raid_disks;
2099 while (md_find_rdev_nr_rcu(mddev, choice))
2101 rdev->desc_nr = choice;
2103 if (md_find_rdev_nr_rcu(mddev, rdev->desc_nr)) {
2109 if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) {
2110 printk(KERN_WARNING "md: %s: array is limited to %d devices\n",
2111 mdname(mddev), mddev->max_disks);
2114 bdevname(rdev->bdev,b);
2115 strreplace(b, '/', '!');
2117 rdev->mddev = mddev;
2118 printk(KERN_INFO "md: bind<%s>\n", b);
2120 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
2123 ko = &part_to_dev(rdev->bdev->bd_part)->kobj;
2124 if (sysfs_create_link(&rdev->kobj, ko, "block"))
2125 /* failure here is OK */;
2126 rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state");
2128 list_add_rcu(&rdev->same_set, &mddev->disks);
2129 bd_link_disk_holder(rdev->bdev, mddev->gendisk);
2131 /* May as well allow recovery to be retried once */
2132 mddev->recovery_disabled++;
2137 printk(KERN_WARNING "md: failed to register dev-%s for %s\n",
2142 static void md_delayed_delete(struct work_struct *ws)
2144 struct md_rdev *rdev = container_of(ws, struct md_rdev, del_work);
2145 kobject_del(&rdev->kobj);
2146 kobject_put(&rdev->kobj);
2149 static void unbind_rdev_from_array(struct md_rdev *rdev)
2151 char b[BDEVNAME_SIZE];
2153 bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk);
2154 list_del_rcu(&rdev->same_set);
2155 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
2157 sysfs_remove_link(&rdev->kobj, "block");
2158 sysfs_put(rdev->sysfs_state);
2159 rdev->sysfs_state = NULL;
2160 rdev->badblocks.count = 0;
2161 /* We need to delay this, otherwise we can deadlock when
2162 * writing to 'remove' to "dev/state". We also need
2163 * to delay it due to rcu usage.
2166 INIT_WORK(&rdev->del_work, md_delayed_delete);
2167 kobject_get(&rdev->kobj);
2168 queue_work(md_misc_wq, &rdev->del_work);
2172 * prevent the device from being mounted, repartitioned or
2173 * otherwise reused by a RAID array (or any other kernel
2174 * subsystem), by bd_claiming the device.
2176 static int lock_rdev(struct md_rdev *rdev, dev_t dev, int shared)
2179 struct block_device *bdev;
2180 char b[BDEVNAME_SIZE];
2182 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
2183 shared ? (struct md_rdev *)lock_rdev : rdev);
2185 printk(KERN_ERR "md: could not open %s.\n",
2186 __bdevname(dev, b));
2187 return PTR_ERR(bdev);
2193 static void unlock_rdev(struct md_rdev *rdev)
2195 struct block_device *bdev = rdev->bdev;
2197 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
2200 void md_autodetect_dev(dev_t dev);
2202 static void export_rdev(struct md_rdev *rdev)
2204 char b[BDEVNAME_SIZE];
2206 printk(KERN_INFO "md: export_rdev(%s)\n",
2207 bdevname(rdev->bdev,b));
2208 md_rdev_clear(rdev);
2210 if (test_bit(AutoDetected, &rdev->flags))
2211 md_autodetect_dev(rdev->bdev->bd_dev);
2214 kobject_put(&rdev->kobj);
2217 void md_kick_rdev_from_array(struct md_rdev *rdev)
2219 unbind_rdev_from_array(rdev);
2222 EXPORT_SYMBOL_GPL(md_kick_rdev_from_array);
2224 static void export_array(struct mddev *mddev)
2226 struct md_rdev *rdev;
2228 while (!list_empty(&mddev->disks)) {
2229 rdev = list_first_entry(&mddev->disks, struct md_rdev,
2231 md_kick_rdev_from_array(rdev);
2233 mddev->raid_disks = 0;
2234 mddev->major_version = 0;
2237 static void sync_sbs(struct mddev *mddev, int nospares)
2239 /* Update each superblock (in-memory image), but
2240 * if we are allowed to, skip spares which already
2241 * have the right event counter, or have one earlier
2242 * (which would mean they aren't being marked as dirty
2243 * with the rest of the array)
2245 struct md_rdev *rdev;
2246 rdev_for_each(rdev, mddev) {
2247 if (rdev->sb_events == mddev->events ||
2249 rdev->raid_disk < 0 &&
2250 rdev->sb_events+1 == mddev->events)) {
2251 /* Don't update this superblock */
2252 rdev->sb_loaded = 2;
2254 sync_super(mddev, rdev);
2255 rdev->sb_loaded = 1;
2260 static bool does_sb_need_changing(struct mddev *mddev)
2262 struct md_rdev *rdev;
2263 struct mdp_superblock_1 *sb;
2266 /* Find a good rdev */
2267 rdev_for_each(rdev, mddev)
2268 if ((rdev->raid_disk >= 0) && !test_bit(Faulty, &rdev->flags))
2271 /* No good device found. */
2275 sb = page_address(rdev->sb_page);
2276 /* Check if a device has become faulty or a spare become active */
2277 rdev_for_each(rdev, mddev) {
2278 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
2279 /* Device activated? */
2280 if (role == 0xffff && rdev->raid_disk >=0 &&
2281 !test_bit(Faulty, &rdev->flags))
2283 /* Device turned faulty? */
2284 if (test_bit(Faulty, &rdev->flags) && (role < 0xfffd))
2288 /* Check if any mddev parameters have changed */
2289 if ((mddev->dev_sectors != le64_to_cpu(sb->size)) ||
2290 (mddev->reshape_position != le64_to_cpu(sb->reshape_position)) ||
2291 (mddev->layout != le32_to_cpu(sb->layout)) ||
2292 (mddev->raid_disks != le32_to_cpu(sb->raid_disks)) ||
2293 (mddev->chunk_sectors != le32_to_cpu(sb->chunksize)))
2299 void md_update_sb(struct mddev *mddev, int force_change)
2301 struct md_rdev *rdev;
2304 int any_badblocks_changed = 0;
2309 set_bit(MD_CHANGE_DEVS, &mddev->flags);
2313 if (mddev_is_clustered(mddev)) {
2314 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
2316 ret = md_cluster_ops->metadata_update_start(mddev);
2317 /* Has someone else has updated the sb */
2318 if (!does_sb_need_changing(mddev)) {
2320 md_cluster_ops->metadata_update_cancel(mddev);
2321 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2326 /* First make sure individual recovery_offsets are correct */
2327 rdev_for_each(rdev, mddev) {
2328 if (rdev->raid_disk >= 0 &&
2329 mddev->delta_disks >= 0 &&
2330 !test_bit(Journal, &rdev->flags) &&
2331 !test_bit(In_sync, &rdev->flags) &&
2332 mddev->curr_resync_completed > rdev->recovery_offset)
2333 rdev->recovery_offset = mddev->curr_resync_completed;
2336 if (!mddev->persistent) {
2337 clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
2338 clear_bit(MD_CHANGE_DEVS, &mddev->flags);
2339 if (!mddev->external) {
2340 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2341 rdev_for_each(rdev, mddev) {
2342 if (rdev->badblocks.changed) {
2343 rdev->badblocks.changed = 0;
2344 md_ack_all_badblocks(&rdev->badblocks);
2345 md_error(mddev, rdev);
2347 clear_bit(Blocked, &rdev->flags);
2348 clear_bit(BlockedBadBlocks, &rdev->flags);
2349 wake_up(&rdev->blocked_wait);
2352 wake_up(&mddev->sb_wait);
2356 spin_lock(&mddev->lock);
2358 mddev->utime = get_seconds();
2360 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
2362 if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags))
2363 /* just a clean<-> dirty transition, possibly leave spares alone,
2364 * though if events isn't the right even/odd, we will have to do
2370 if (mddev->degraded)
2371 /* If the array is degraded, then skipping spares is both
2372 * dangerous and fairly pointless.
2373 * Dangerous because a device that was removed from the array
2374 * might have a event_count that still looks up-to-date,
2375 * so it can be re-added without a resync.
2376 * Pointless because if there are any spares to skip,
2377 * then a recovery will happen and soon that array won't
2378 * be degraded any more and the spare can go back to sleep then.
2382 sync_req = mddev->in_sync;
2384 /* If this is just a dirty<->clean transition, and the array is clean
2385 * and 'events' is odd, we can roll back to the previous clean state */
2387 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
2388 && mddev->can_decrease_events
2389 && mddev->events != 1) {
2391 mddev->can_decrease_events = 0;
2393 /* otherwise we have to go forward and ... */
2395 mddev->can_decrease_events = nospares;
2399 * This 64-bit counter should never wrap.
2400 * Either we are in around ~1 trillion A.C., assuming
2401 * 1 reboot per second, or we have a bug...
2403 WARN_ON(mddev->events == 0);
2405 rdev_for_each(rdev, mddev) {
2406 if (rdev->badblocks.changed)
2407 any_badblocks_changed++;
2408 if (test_bit(Faulty, &rdev->flags))
2409 set_bit(FaultRecorded, &rdev->flags);
2412 sync_sbs(mddev, nospares);
2413 spin_unlock(&mddev->lock);
2415 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2416 mdname(mddev), mddev->in_sync);
2418 bitmap_update_sb(mddev->bitmap);
2419 rdev_for_each(rdev, mddev) {
2420 char b[BDEVNAME_SIZE];
2422 if (rdev->sb_loaded != 1)
2423 continue; /* no noise on spare devices */
2425 if (!test_bit(Faulty, &rdev->flags)) {
2426 md_super_write(mddev,rdev,
2427 rdev->sb_start, rdev->sb_size,
2429 pr_debug("md: (write) %s's sb offset: %llu\n",
2430 bdevname(rdev->bdev, b),
2431 (unsigned long long)rdev->sb_start);
2432 rdev->sb_events = mddev->events;
2433 if (rdev->badblocks.size) {
2434 md_super_write(mddev, rdev,
2435 rdev->badblocks.sector,
2436 rdev->badblocks.size << 9,
2438 rdev->badblocks.size = 0;
2442 pr_debug("md: %s (skipping faulty)\n",
2443 bdevname(rdev->bdev, b));
2445 if (mddev->level == LEVEL_MULTIPATH)
2446 /* only need to write one superblock... */
2449 md_super_wait(mddev);
2450 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2452 spin_lock(&mddev->lock);
2453 if (mddev->in_sync != sync_req ||
2454 test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
2455 /* have to write it out again */
2456 spin_unlock(&mddev->lock);
2459 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2460 spin_unlock(&mddev->lock);
2461 wake_up(&mddev->sb_wait);
2462 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
2463 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
2465 rdev_for_each(rdev, mddev) {
2466 if (test_and_clear_bit(FaultRecorded, &rdev->flags))
2467 clear_bit(Blocked, &rdev->flags);
2469 if (any_badblocks_changed)
2470 md_ack_all_badblocks(&rdev->badblocks);
2471 clear_bit(BlockedBadBlocks, &rdev->flags);
2472 wake_up(&rdev->blocked_wait);
2475 if (mddev_is_clustered(mddev) && ret == 0)
2476 md_cluster_ops->metadata_update_finish(mddev);
2478 EXPORT_SYMBOL(md_update_sb);
2480 static int add_bound_rdev(struct md_rdev *rdev)
2482 struct mddev *mddev = rdev->mddev;
2485 if (!mddev->pers->hot_remove_disk) {
2486 /* If there is hot_add_disk but no hot_remove_disk
2487 * then added disks for geometry changes,
2488 * and should be added immediately.
2490 super_types[mddev->major_version].
2491 validate_super(mddev, rdev);
2492 err = mddev->pers->hot_add_disk(mddev, rdev);
2494 unbind_rdev_from_array(rdev);
2499 sysfs_notify_dirent_safe(rdev->sysfs_state);
2501 set_bit(MD_CHANGE_DEVS, &mddev->flags);
2502 if (mddev->degraded)
2503 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
2504 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2505 md_new_event(mddev);
2506 md_wakeup_thread(mddev->thread);
2510 /* words written to sysfs files may, or may not, be \n terminated.
2511 * We want to accept with case. For this we use cmd_match.
2513 static int cmd_match(const char *cmd, const char *str)
2515 /* See if cmd, written into a sysfs file, matches
2516 * str. They must either be the same, or cmd can
2517 * have a trailing newline
2519 while (*cmd && *str && *cmd == *str) {
2530 struct rdev_sysfs_entry {
2531 struct attribute attr;
2532 ssize_t (*show)(struct md_rdev *, char *);
2533 ssize_t (*store)(struct md_rdev *, const char *, size_t);
2537 state_show(struct md_rdev *rdev, char *page)
2541 unsigned long flags = ACCESS_ONCE(rdev->flags);
2543 if (test_bit(Faulty, &flags) ||
2544 rdev->badblocks.unacked_exist) {
2545 len+= sprintf(page+len, "%sfaulty",sep);
2548 if (test_bit(In_sync, &flags)) {
2549 len += sprintf(page+len, "%sin_sync",sep);
2552 if (test_bit(Journal, &flags)) {
2553 len += sprintf(page+len, "%sjournal",sep);
2556 if (test_bit(WriteMostly, &flags)) {
2557 len += sprintf(page+len, "%swrite_mostly",sep);
2560 if (test_bit(Blocked, &flags) ||
2561 (rdev->badblocks.unacked_exist
2562 && !test_bit(Faulty, &flags))) {
2563 len += sprintf(page+len, "%sblocked", sep);
2566 if (!test_bit(Faulty, &flags) &&
2567 !test_bit(Journal, &flags) &&
2568 !test_bit(In_sync, &flags)) {
2569 len += sprintf(page+len, "%sspare", sep);
2572 if (test_bit(WriteErrorSeen, &flags)) {
2573 len += sprintf(page+len, "%swrite_error", sep);
2576 if (test_bit(WantReplacement, &flags)) {
2577 len += sprintf(page+len, "%swant_replacement", sep);
2580 if (test_bit(Replacement, &flags)) {
2581 len += sprintf(page+len, "%sreplacement", sep);
2585 return len+sprintf(page+len, "\n");
2589 state_store(struct md_rdev *rdev, const char *buf, size_t len)
2592 * faulty - simulates an error
2593 * remove - disconnects the device
2594 * writemostly - sets write_mostly
2595 * -writemostly - clears write_mostly
2596 * blocked - sets the Blocked flags
2597 * -blocked - clears the Blocked and possibly simulates an error
2598 * insync - sets Insync providing device isn't active
2599 * -insync - clear Insync for a device with a slot assigned,
2600 * so that it gets rebuilt based on bitmap
2601 * write_error - sets WriteErrorSeen
2602 * -write_error - clears WriteErrorSeen
2605 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
2606 md_error(rdev->mddev, rdev);
2607 if (test_bit(Faulty, &rdev->flags))
2611 } else if (cmd_match(buf, "remove")) {
2612 if (rdev->raid_disk >= 0)
2615 struct mddev *mddev = rdev->mddev;
2617 if (mddev_is_clustered(mddev))
2618 err = md_cluster_ops->remove_disk(mddev, rdev);
2621 md_kick_rdev_from_array(rdev);
2623 md_update_sb(mddev, 1);
2624 md_new_event(mddev);
2627 } else if (cmd_match(buf, "writemostly")) {
2628 set_bit(WriteMostly, &rdev->flags);
2630 } else if (cmd_match(buf, "-writemostly")) {
2631 clear_bit(WriteMostly, &rdev->flags);
2633 } else if (cmd_match(buf, "blocked")) {
2634 set_bit(Blocked, &rdev->flags);
2636 } else if (cmd_match(buf, "-blocked")) {
2637 if (!test_bit(Faulty, &rdev->flags) &&
2638 rdev->badblocks.unacked_exist) {
2639 /* metadata handler doesn't understand badblocks,
2640 * so we need to fail the device
2642 md_error(rdev->mddev, rdev);
2644 clear_bit(Blocked, &rdev->flags);
2645 clear_bit(BlockedBadBlocks, &rdev->flags);
2646 wake_up(&rdev->blocked_wait);
2647 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2648 md_wakeup_thread(rdev->mddev->thread);
2651 } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) {
2652 set_bit(In_sync, &rdev->flags);
2654 } else if (cmd_match(buf, "-insync") && rdev->raid_disk >= 0 &&
2655 !test_bit(Journal, &rdev->flags)) {
2656 if (rdev->mddev->pers == NULL) {
2657 clear_bit(In_sync, &rdev->flags);
2658 rdev->saved_raid_disk = rdev->raid_disk;
2659 rdev->raid_disk = -1;
2662 } else if (cmd_match(buf, "write_error")) {
2663 set_bit(WriteErrorSeen, &rdev->flags);
2665 } else if (cmd_match(buf, "-write_error")) {
2666 clear_bit(WriteErrorSeen, &rdev->flags);
2668 } else if (cmd_match(buf, "want_replacement")) {
2669 /* Any non-spare device that is not a replacement can
2670 * become want_replacement at any time, but we then need to
2671 * check if recovery is needed.
2673 if (rdev->raid_disk >= 0 &&
2674 !test_bit(Journal, &rdev->flags) &&
2675 !test_bit(Replacement, &rdev->flags))
2676 set_bit(WantReplacement, &rdev->flags);
2677 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2678 md_wakeup_thread(rdev->mddev->thread);
2680 } else if (cmd_match(buf, "-want_replacement")) {
2681 /* Clearing 'want_replacement' is always allowed.
2682 * Once replacements starts it is too late though.
2685 clear_bit(WantReplacement, &rdev->flags);
2686 } else if (cmd_match(buf, "replacement")) {
2687 /* Can only set a device as a replacement when array has not
2688 * yet been started. Once running, replacement is automatic
2689 * from spares, or by assigning 'slot'.
2691 if (rdev->mddev->pers)
2694 set_bit(Replacement, &rdev->flags);
2697 } else if (cmd_match(buf, "-replacement")) {
2698 /* Similarly, can only clear Replacement before start */
2699 if (rdev->mddev->pers)
2702 clear_bit(Replacement, &rdev->flags);
2705 } else if (cmd_match(buf, "re-add")) {
2706 if (!rdev->mddev->pers)
2708 else if (test_bit(Faulty, &rdev->flags) && (rdev->raid_disk == -1) &&
2709 rdev->saved_raid_disk >= 0) {
2710 /* clear_bit is performed _after_ all the devices
2711 * have their local Faulty bit cleared. If any writes
2712 * happen in the meantime in the local node, they
2713 * will land in the local bitmap, which will be synced
2714 * by this node eventually
2716 if (!mddev_is_clustered(rdev->mddev) ||
2717 (err = md_cluster_ops->gather_bitmaps(rdev)) == 0) {
2718 clear_bit(Faulty, &rdev->flags);
2719 err = add_bound_rdev(rdev);
2725 sysfs_notify_dirent_safe(rdev->sysfs_state);
2726 return err ? err : len;
2728 static struct rdev_sysfs_entry rdev_state =
2729 __ATTR_PREALLOC(state, S_IRUGO|S_IWUSR, state_show, state_store);
2732 errors_show(struct md_rdev *rdev, char *page)
2734 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
2738 errors_store(struct md_rdev *rdev, const char *buf, size_t len)
2743 rv = kstrtouint(buf, 10, &n);
2746 atomic_set(&rdev->corrected_errors, n);
2749 static struct rdev_sysfs_entry rdev_errors =
2750 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
2753 slot_show(struct md_rdev *rdev, char *page)
2755 if (test_bit(Journal, &rdev->flags))
2756 return sprintf(page, "journal\n");
2757 else if (rdev->raid_disk < 0)
2758 return sprintf(page, "none\n");
2760 return sprintf(page, "%d\n", rdev->raid_disk);
2764 slot_store(struct md_rdev *rdev, const char *buf, size_t len)
2769 if (test_bit(Journal, &rdev->flags))
2771 if (strncmp(buf, "none", 4)==0)
2774 err = kstrtouint(buf, 10, (unsigned int *)&slot);
2778 if (rdev->mddev->pers && slot == -1) {
2779 /* Setting 'slot' on an active array requires also
2780 * updating the 'rd%d' link, and communicating
2781 * with the personality with ->hot_*_disk.
2782 * For now we only support removing
2783 * failed/spare devices. This normally happens automatically,
2784 * but not when the metadata is externally managed.
2786 if (rdev->raid_disk == -1)
2788 /* personality does all needed checks */
2789 if (rdev->mddev->pers->hot_remove_disk == NULL)
2791 clear_bit(Blocked, &rdev->flags);
2792 remove_and_add_spares(rdev->mddev, rdev);
2793 if (rdev->raid_disk >= 0)
2795 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2796 md_wakeup_thread(rdev->mddev->thread);
2797 } else if (rdev->mddev->pers) {
2798 /* Activating a spare .. or possibly reactivating
2799 * if we ever get bitmaps working here.
2803 if (rdev->raid_disk != -1)
2806 if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery))
2809 if (rdev->mddev->pers->hot_add_disk == NULL)
2812 if (slot >= rdev->mddev->raid_disks &&
2813 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
2816 rdev->raid_disk = slot;
2817 if (test_bit(In_sync, &rdev->flags))
2818 rdev->saved_raid_disk = slot;
2820 rdev->saved_raid_disk = -1;
2821 clear_bit(In_sync, &rdev->flags);
2822 clear_bit(Bitmap_sync, &rdev->flags);
2823 err = rdev->mddev->pers->
2824 hot_add_disk(rdev->mddev, rdev);
2826 rdev->raid_disk = -1;
2829 sysfs_notify_dirent_safe(rdev->sysfs_state);
2830 if (sysfs_link_rdev(rdev->mddev, rdev))
2831 /* failure here is OK */;
2832 /* don't wakeup anyone, leave that to userspace. */
2834 if (slot >= rdev->mddev->raid_disks &&
2835 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
2837 rdev->raid_disk = slot;
2838 /* assume it is working */
2839 clear_bit(Faulty, &rdev->flags);
2840 clear_bit(WriteMostly, &rdev->flags);
2841 set_bit(In_sync, &rdev->flags);
2842 sysfs_notify_dirent_safe(rdev->sysfs_state);
2847 static struct rdev_sysfs_entry rdev_slot =
2848 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
2851 offset_show(struct md_rdev *rdev, char *page)
2853 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
2857 offset_store(struct md_rdev *rdev, const char *buf, size_t len)
2859 unsigned long long offset;
2860 if (kstrtoull(buf, 10, &offset) < 0)
2862 if (rdev->mddev->pers && rdev->raid_disk >= 0)
2864 if (rdev->sectors && rdev->mddev->external)
2865 /* Must set offset before size, so overlap checks
2868 rdev->data_offset = offset;
2869 rdev->new_data_offset = offset;
2873 static struct rdev_sysfs_entry rdev_offset =
2874 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
2876 static ssize_t new_offset_show(struct md_rdev *rdev, char *page)
2878 return sprintf(page, "%llu\n",
2879 (unsigned long long)rdev->new_data_offset);
2882 static ssize_t new_offset_store(struct md_rdev *rdev,
2883 const char *buf, size_t len)
2885 unsigned long long new_offset;
2886 struct mddev *mddev = rdev->mddev;
2888 if (kstrtoull(buf, 10, &new_offset) < 0)
2891 if (mddev->sync_thread ||
2892 test_bit(MD_RECOVERY_RUNNING,&mddev->recovery))
2894 if (new_offset == rdev->data_offset)
2895 /* reset is always permitted */
2897 else if (new_offset > rdev->data_offset) {
2898 /* must not push array size beyond rdev_sectors */
2899 if (new_offset - rdev->data_offset
2900 + mddev->dev_sectors > rdev->sectors)
2903 /* Metadata worries about other space details. */
2905 /* decreasing the offset is inconsistent with a backwards
2908 if (new_offset < rdev->data_offset &&
2909 mddev->reshape_backwards)
2911 /* Increasing offset is inconsistent with forwards
2912 * reshape. reshape_direction should be set to
2913 * 'backwards' first.
2915 if (new_offset > rdev->data_offset &&
2916 !mddev->reshape_backwards)
2919 if (mddev->pers && mddev->persistent &&
2920 !super_types[mddev->major_version]
2921 .allow_new_offset(rdev, new_offset))
2923 rdev->new_data_offset = new_offset;
2924 if (new_offset > rdev->data_offset)
2925 mddev->reshape_backwards = 1;
2926 else if (new_offset < rdev->data_offset)
2927 mddev->reshape_backwards = 0;
2931 static struct rdev_sysfs_entry rdev_new_offset =
2932 __ATTR(new_offset, S_IRUGO|S_IWUSR, new_offset_show, new_offset_store);
2935 rdev_size_show(struct md_rdev *rdev, char *page)
2937 return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2);
2940 static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
2942 /* check if two start/length pairs overlap */
2950 static int strict_blocks_to_sectors(const char *buf, sector_t *sectors)
2952 unsigned long long blocks;
2955 if (kstrtoull(buf, 10, &blocks) < 0)
2958 if (blocks & 1ULL << (8 * sizeof(blocks) - 1))
2959 return -EINVAL; /* sector conversion overflow */
2962 if (new != blocks * 2)
2963 return -EINVAL; /* unsigned long long to sector_t overflow */
2970 rdev_size_store(struct md_rdev *rdev, const char *buf, size_t len)
2972 struct mddev *my_mddev = rdev->mddev;
2973 sector_t oldsectors = rdev->sectors;
2976 if (test_bit(Journal, &rdev->flags))
2978 if (strict_blocks_to_sectors(buf, §ors) < 0)
2980 if (rdev->data_offset != rdev->new_data_offset)
2981 return -EINVAL; /* too confusing */
2982 if (my_mddev->pers && rdev->raid_disk >= 0) {
2983 if (my_mddev->persistent) {
2984 sectors = super_types[my_mddev->major_version].
2985 rdev_size_change(rdev, sectors);
2988 } else if (!sectors)
2989 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) -
2991 if (!my_mddev->pers->resize)
2992 /* Cannot change size for RAID0 or Linear etc */
2995 if (sectors < my_mddev->dev_sectors)
2996 return -EINVAL; /* component must fit device */
2998 rdev->sectors = sectors;
2999 if (sectors > oldsectors && my_mddev->external) {
3000 /* Need to check that all other rdevs with the same
3001 * ->bdev do not overlap. 'rcu' is sufficient to walk
3002 * the rdev lists safely.
3003 * This check does not provide a hard guarantee, it
3004 * just helps avoid dangerous mistakes.
3006 struct mddev *mddev;
3008 struct list_head *tmp;
3011 for_each_mddev(mddev, tmp) {
3012 struct md_rdev *rdev2;
3014 rdev_for_each(rdev2, mddev)
3015 if (rdev->bdev == rdev2->bdev &&
3017 overlaps(rdev->data_offset, rdev->sectors,
3030 /* Someone else could have slipped in a size
3031 * change here, but doing so is just silly.
3032 * We put oldsectors back because we *know* it is
3033 * safe, and trust userspace not to race with
3036 rdev->sectors = oldsectors;
3043 static struct rdev_sysfs_entry rdev_size =
3044 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
3046 static ssize_t recovery_start_show(struct md_rdev *rdev, char *page)
3048 unsigned long long recovery_start = rdev->recovery_offset;
3050 if (test_bit(In_sync, &rdev->flags) ||
3051 recovery_start == MaxSector)
3052 return sprintf(page, "none\n");
3054 return sprintf(page, "%llu\n", recovery_start);
3057 static ssize_t recovery_start_store(struct md_rdev *rdev, const char *buf, size_t len)
3059 unsigned long long recovery_start;
3061 if (cmd_match(buf, "none"))
3062 recovery_start = MaxSector;
3063 else if (kstrtoull(buf, 10, &recovery_start))
3066 if (rdev->mddev->pers &&
3067 rdev->raid_disk >= 0)
3070 rdev->recovery_offset = recovery_start;
3071 if (recovery_start == MaxSector)
3072 set_bit(In_sync, &rdev->flags);
3074 clear_bit(In_sync, &rdev->flags);
3078 static struct rdev_sysfs_entry rdev_recovery_start =
3079 __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store);
3082 badblocks_show(struct badblocks *bb, char *page, int unack);
3084 badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack);
3086 static ssize_t bb_show(struct md_rdev *rdev, char *page)
3088 return badblocks_show(&rdev->badblocks, page, 0);
3090 static ssize_t bb_store(struct md_rdev *rdev, const char *page, size_t len)
3092 int rv = badblocks_store(&rdev->badblocks, page, len, 0);
3093 /* Maybe that ack was all we needed */
3094 if (test_and_clear_bit(BlockedBadBlocks, &rdev->flags))
3095 wake_up(&rdev->blocked_wait);
3098 static struct rdev_sysfs_entry rdev_bad_blocks =
3099 __ATTR(bad_blocks, S_IRUGO|S_IWUSR, bb_show, bb_store);
3101 static ssize_t ubb_show(struct md_rdev *rdev, char *page)
3103 return badblocks_show(&rdev->badblocks, page, 1);
3105 static ssize_t ubb_store(struct md_rdev *rdev, const char *page, size_t len)
3107 return badblocks_store(&rdev->badblocks, page, len, 1);
3109 static struct rdev_sysfs_entry rdev_unack_bad_blocks =
3110 __ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store);
3112 static struct attribute *rdev_default_attrs[] = {
3117 &rdev_new_offset.attr,
3119 &rdev_recovery_start.attr,
3120 &rdev_bad_blocks.attr,
3121 &rdev_unack_bad_blocks.attr,
3125 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
3127 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3128 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3134 return entry->show(rdev, page);
3138 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
3139 const char *page, size_t length)
3141 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3142 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3144 struct mddev *mddev = rdev->mddev;
3148 if (!capable(CAP_SYS_ADMIN))
3150 rv = mddev ? mddev_lock(mddev): -EBUSY;
3152 if (rdev->mddev == NULL)
3155 rv = entry->store(rdev, page, length);
3156 mddev_unlock(mddev);
3161 static void rdev_free(struct kobject *ko)
3163 struct md_rdev *rdev = container_of(ko, struct md_rdev, kobj);
3166 static const struct sysfs_ops rdev_sysfs_ops = {
3167 .show = rdev_attr_show,
3168 .store = rdev_attr_store,
3170 static struct kobj_type rdev_ktype = {
3171 .release = rdev_free,
3172 .sysfs_ops = &rdev_sysfs_ops,
3173 .default_attrs = rdev_default_attrs,
3176 int md_rdev_init(struct md_rdev *rdev)
3179 rdev->saved_raid_disk = -1;
3180 rdev->raid_disk = -1;
3182 rdev->data_offset = 0;
3183 rdev->new_data_offset = 0;
3184 rdev->sb_events = 0;
3185 rdev->last_read_error.tv_sec = 0;
3186 rdev->last_read_error.tv_nsec = 0;
3187 rdev->sb_loaded = 0;
3188 rdev->bb_page = NULL;
3189 atomic_set(&rdev->nr_pending, 0);
3190 atomic_set(&rdev->read_errors, 0);
3191 atomic_set(&rdev->corrected_errors, 0);
3193 INIT_LIST_HEAD(&rdev->same_set);
3194 init_waitqueue_head(&rdev->blocked_wait);
3196 /* Add space to store bad block list.
3197 * This reserves the space even on arrays where it cannot
3198 * be used - I wonder if that matters
3200 rdev->badblocks.count = 0;
3201 rdev->badblocks.shift = -1; /* disabled until explicitly enabled */
3202 rdev->badblocks.page = kmalloc(PAGE_SIZE, GFP_KERNEL);
3203 seqlock_init(&rdev->badblocks.lock);
3204 if (rdev->badblocks.page == NULL)
3209 EXPORT_SYMBOL_GPL(md_rdev_init);
3211 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3213 * mark the device faulty if:
3215 * - the device is nonexistent (zero size)
3216 * - the device has no valid superblock
3218 * a faulty rdev _never_ has rdev->sb set.
3220 static struct md_rdev *md_import_device(dev_t newdev, int super_format, int super_minor)
3222 char b[BDEVNAME_SIZE];
3224 struct md_rdev *rdev;
3227 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
3229 printk(KERN_ERR "md: could not alloc mem for new device!\n");
3230 return ERR_PTR(-ENOMEM);
3233 err = md_rdev_init(rdev);
3236 err = alloc_disk_sb(rdev);
3240 err = lock_rdev(rdev, newdev, super_format == -2);
3244 kobject_init(&rdev->kobj, &rdev_ktype);
3246 size = i_size_read(rdev->bdev->bd_inode) >> BLOCK_SIZE_BITS;
3249 "md: %s has zero or unknown size, marking faulty!\n",
3250 bdevname(rdev->bdev,b));
3255 if (super_format >= 0) {
3256 err = super_types[super_format].
3257 load_super(rdev, NULL, super_minor);
3258 if (err == -EINVAL) {
3260 "md: %s does not have a valid v%d.%d "
3261 "superblock, not importing!\n",
3262 bdevname(rdev->bdev,b),
3263 super_format, super_minor);
3268 "md: could not read %s's sb, not importing!\n",
3269 bdevname(rdev->bdev,b));
3279 md_rdev_clear(rdev);
3281 return ERR_PTR(err);
3285 * Check a full RAID array for plausibility
3288 static void analyze_sbs(struct mddev *mddev)
3291 struct md_rdev *rdev, *freshest, *tmp;
3292 char b[BDEVNAME_SIZE];
3295 rdev_for_each_safe(rdev, tmp, mddev)
3296 switch (super_types[mddev->major_version].
3297 load_super(rdev, freshest, mddev->minor_version)) {
3305 "md: fatal superblock inconsistency in %s"
3306 " -- removing from array\n",
3307 bdevname(rdev->bdev,b));
3308 md_kick_rdev_from_array(rdev);
3311 super_types[mddev->major_version].
3312 validate_super(mddev, freshest);
3315 rdev_for_each_safe(rdev, tmp, mddev) {
3316 if (mddev->max_disks &&
3317 (rdev->desc_nr >= mddev->max_disks ||
3318 i > mddev->max_disks)) {
3320 "md: %s: %s: only %d devices permitted\n",
3321 mdname(mddev), bdevname(rdev->bdev, b),
3323 md_kick_rdev_from_array(rdev);
3326 if (rdev != freshest) {
3327 if (super_types[mddev->major_version].
3328 validate_super(mddev, rdev)) {
3329 printk(KERN_WARNING "md: kicking non-fresh %s"
3331 bdevname(rdev->bdev,b));
3332 md_kick_rdev_from_array(rdev);
3336 if (mddev->level == LEVEL_MULTIPATH) {
3337 rdev->desc_nr = i++;
3338 rdev->raid_disk = rdev->desc_nr;
3339 set_bit(In_sync, &rdev->flags);
3340 } else if (rdev->raid_disk >=
3341 (mddev->raid_disks - min(0, mddev->delta_disks)) &&
3342 !test_bit(Journal, &rdev->flags)) {
3343 rdev->raid_disk = -1;
3344 clear_bit(In_sync, &rdev->flags);
3349 /* Read a fixed-point number.
3350 * Numbers in sysfs attributes should be in "standard" units where
3351 * possible, so time should be in seconds.
3352 * However we internally use a a much smaller unit such as
3353 * milliseconds or jiffies.
3354 * This function takes a decimal number with a possible fractional
3355 * component, and produces an integer which is the result of
3356 * multiplying that number by 10^'scale'.
3357 * all without any floating-point arithmetic.
3359 int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale)
3361 unsigned long result = 0;
3363 while (isdigit(*cp) || (*cp == '.' && decimals < 0)) {
3366 else if (decimals < scale) {
3369 result = result * 10 + value;
3381 while (decimals < scale) {
3390 safe_delay_show(struct mddev *mddev, char *page)
3392 int msec = (mddev->safemode_delay*1000)/HZ;
3393 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
3396 safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len)
3400 if (mddev_is_clustered(mddev)) {
3401 pr_info("md: Safemode is disabled for clustered mode\n");
3405 if (strict_strtoul_scaled(cbuf, &msec, 3) < 0)
3408 mddev->safemode_delay = 0;
3410 unsigned long old_delay = mddev->safemode_delay;
3411 unsigned long new_delay = (msec*HZ)/1000;
3415 mddev->safemode_delay = new_delay;
3416 if (new_delay < old_delay || old_delay == 0)
3417 mod_timer(&mddev->safemode_timer, jiffies+1);
3421 static struct md_sysfs_entry md_safe_delay =
3422 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
3425 level_show(struct mddev *mddev, char *page)
3427 struct md_personality *p;
3429 spin_lock(&mddev->lock);
3432 ret = sprintf(page, "%s\n", p->name);
3433 else if (mddev->clevel[0])
3434 ret = sprintf(page, "%s\n", mddev->clevel);
3435 else if (mddev->level != LEVEL_NONE)
3436 ret = sprintf(page, "%d\n", mddev->level);
3439 spin_unlock(&mddev->lock);
3444 level_store(struct mddev *mddev, const char *buf, size_t len)
3449 struct md_personality *pers, *oldpers;
3451 void *priv, *oldpriv;
3452 struct md_rdev *rdev;
3454 if (slen == 0 || slen >= sizeof(clevel))
3457 rv = mddev_lock(mddev);
3461 if (mddev->pers == NULL) {
3462 strncpy(mddev->clevel, buf, slen);
3463 if (mddev->clevel[slen-1] == '\n')
3465 mddev->clevel[slen] = 0;
3466 mddev->level = LEVEL_NONE;
3474 /* request to change the personality. Need to ensure:
3475 * - array is not engaged in resync/recovery/reshape
3476 * - old personality can be suspended
3477 * - new personality will access other array.
3481 if (mddev->sync_thread ||
3482 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3483 mddev->reshape_position != MaxSector ||
3484 mddev->sysfs_active)
3488 if (!mddev->pers->quiesce) {
3489 printk(KERN_WARNING "md: %s: %s does not support online personality change\n",
3490 mdname(mddev), mddev->pers->name);
3494 /* Now find the new personality */
3495 strncpy(clevel, buf, slen);
3496 if (clevel[slen-1] == '\n')
3499 if (kstrtol(clevel, 10, &level))
3502 if (request_module("md-%s", clevel) != 0)
3503 request_module("md-level-%s", clevel);
3504 spin_lock(&pers_lock);
3505 pers = find_pers(level, clevel);
3506 if (!pers || !try_module_get(pers->owner)) {
3507 spin_unlock(&pers_lock);
3508 printk(KERN_WARNING "md: personality %s not loaded\n", clevel);
3512 spin_unlock(&pers_lock);
3514 if (pers == mddev->pers) {
3515 /* Nothing to do! */
3516 module_put(pers->owner);
3520 if (!pers->takeover) {
3521 module_put(pers->owner);
3522 printk(KERN_WARNING "md: %s: %s does not support personality takeover\n",
3523 mdname(mddev), clevel);
3528 rdev_for_each(rdev, mddev)
3529 rdev->new_raid_disk = rdev->raid_disk;
3531 /* ->takeover must set new_* and/or delta_disks
3532 * if it succeeds, and may set them when it fails.
3534 priv = pers->takeover(mddev);
3536 mddev->new_level = mddev->level;
3537 mddev->new_layout = mddev->layout;
3538 mddev->new_chunk_sectors = mddev->chunk_sectors;
3539 mddev->raid_disks -= mddev->delta_disks;
3540 mddev->delta_disks = 0;
3541 mddev->reshape_backwards = 0;
3542 module_put(pers->owner);
3543 printk(KERN_WARNING "md: %s: %s would not accept array\n",
3544 mdname(mddev), clevel);
3549 /* Looks like we have a winner */
3550 mddev_suspend(mddev);
3551 mddev_detach(mddev);
3553 spin_lock(&mddev->lock);
3554 oldpers = mddev->pers;
3555 oldpriv = mddev->private;
3557 mddev->private = priv;
3558 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
3559 mddev->level = mddev->new_level;
3560 mddev->layout = mddev->new_layout;
3561 mddev->chunk_sectors = mddev->new_chunk_sectors;
3562 mddev->delta_disks = 0;
3563 mddev->reshape_backwards = 0;
3564 mddev->degraded = 0;
3565 spin_unlock(&mddev->lock);
3567 if (oldpers->sync_request == NULL &&
3569 /* We are converting from a no-redundancy array
3570 * to a redundancy array and metadata is managed
3571 * externally so we need to be sure that writes
3572 * won't block due to a need to transition
3574 * until external management is started.
3577 mddev->safemode_delay = 0;
3578 mddev->safemode = 0;
3581 oldpers->free(mddev, oldpriv);
3583 if (oldpers->sync_request == NULL &&
3584 pers->sync_request != NULL) {
3585 /* need to add the md_redundancy_group */
3586 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
3588 "md: cannot register extra attributes for %s\n",
3590 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action");
3592 if (oldpers->sync_request != NULL &&
3593 pers->sync_request == NULL) {
3594 /* need to remove the md_redundancy_group */
3595 if (mddev->to_remove == NULL)
3596 mddev->to_remove = &md_redundancy_group;
3599 rdev_for_each(rdev, mddev) {
3600 if (rdev->raid_disk < 0)
3602 if (rdev->new_raid_disk >= mddev->raid_disks)
3603 rdev->new_raid_disk = -1;
3604 if (rdev->new_raid_disk == rdev->raid_disk)
3606 sysfs_unlink_rdev(mddev, rdev);
3608 rdev_for_each(rdev, mddev) {
3609 if (rdev->raid_disk < 0)
3611 if (rdev->new_raid_disk == rdev->raid_disk)
3613 rdev->raid_disk = rdev->new_raid_disk;
3614 if (rdev->raid_disk < 0)
3615 clear_bit(In_sync, &rdev->flags);
3617 if (sysfs_link_rdev(mddev, rdev))
3618 printk(KERN_WARNING "md: cannot register rd%d"
3619 " for %s after level change\n",
3620 rdev->raid_disk, mdname(mddev));
3624 if (pers->sync_request == NULL) {
3625 /* this is now an array without redundancy, so
3626 * it must always be in_sync
3629 del_timer_sync(&mddev->safemode_timer);
3631 blk_set_stacking_limits(&mddev->queue->limits);
3633 set_bit(MD_CHANGE_DEVS, &mddev->flags);
3634 mddev_resume(mddev);
3636 md_update_sb(mddev, 1);
3637 sysfs_notify(&mddev->kobj, NULL, "level");
3638 md_new_event(mddev);
3641 mddev_unlock(mddev);
3645 static struct md_sysfs_entry md_level =
3646 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
3649 layout_show(struct mddev *mddev, char *page)
3651 /* just a number, not meaningful for all levels */
3652 if (mddev->reshape_position != MaxSector &&
3653 mddev->layout != mddev->new_layout)
3654 return sprintf(page, "%d (%d)\n",
3655 mddev->new_layout, mddev->layout);
3656 return sprintf(page, "%d\n", mddev->layout);
3660 layout_store(struct mddev *mddev, const char *buf, size_t len)
3665 err = kstrtouint(buf, 10, &n);
3668 err = mddev_lock(mddev);
3673 if (mddev->pers->check_reshape == NULL)
3678 mddev->new_layout = n;
3679 err = mddev->pers->check_reshape(mddev);
3681 mddev->new_layout = mddev->layout;
3684 mddev->new_layout = n;
3685 if (mddev->reshape_position == MaxSector)
3688 mddev_unlock(mddev);
3691 static struct md_sysfs_entry md_layout =
3692 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
3695 raid_disks_show(struct mddev *mddev, char *page)
3697 if (mddev->raid_disks == 0)
3699 if (mddev->reshape_position != MaxSector &&
3700 mddev->delta_disks != 0)
3701 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
3702 mddev->raid_disks - mddev->delta_disks);
3703 return sprintf(page, "%d\n", mddev->raid_disks);
3706 static int update_raid_disks(struct mddev *mddev, int raid_disks);
3709 raid_disks_store(struct mddev *mddev, const char *buf, size_t len)
3714 err = kstrtouint(buf, 10, &n);
3718 err = mddev_lock(mddev);
3722 err = update_raid_disks(mddev, n);
3723 else if (mddev->reshape_position != MaxSector) {
3724 struct md_rdev *rdev;
3725 int olddisks = mddev->raid_disks - mddev->delta_disks;
3728 rdev_for_each(rdev, mddev) {
3730 rdev->data_offset < rdev->new_data_offset)
3733 rdev->data_offset > rdev->new_data_offset)
3737 mddev->delta_disks = n - olddisks;
3738 mddev->raid_disks = n;
3739 mddev->reshape_backwards = (mddev->delta_disks < 0);
3741 mddev->raid_disks = n;
3743 mddev_unlock(mddev);
3744 return err ? err : len;
3746 static struct md_sysfs_entry md_raid_disks =
3747 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
3750 chunk_size_show(struct mddev *mddev, char *page)
3752 if (mddev->reshape_position != MaxSector &&
3753 mddev->chunk_sectors != mddev->new_chunk_sectors)
3754 return sprintf(page, "%d (%d)\n",
3755 mddev->new_chunk_sectors << 9,
3756 mddev->chunk_sectors << 9);
3757 return sprintf(page, "%d\n", mddev->chunk_sectors << 9);
3761 chunk_size_store(struct mddev *mddev, const char *buf, size_t len)
3766 err = kstrtoul(buf, 10, &n);
3770 err = mddev_lock(mddev);
3774 if (mddev->pers->check_reshape == NULL)
3779 mddev->new_chunk_sectors = n >> 9;
3780 err = mddev->pers->check_reshape(mddev);
3782 mddev->new_chunk_sectors = mddev->chunk_sectors;
3785 mddev->new_chunk_sectors = n >> 9;
3786 if (mddev->reshape_position == MaxSector)
3787 mddev->chunk_sectors = n >> 9;
3789 mddev_unlock(mddev);
3792 static struct md_sysfs_entry md_chunk_size =
3793 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
3796 resync_start_show(struct mddev *mddev, char *page)
3798 if (mddev->recovery_cp == MaxSector)
3799 return sprintf(page, "none\n");
3800 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
3804 resync_start_store(struct mddev *mddev, const char *buf, size_t len)
3806 unsigned long long n;
3809 if (cmd_match(buf, "none"))
3812 err = kstrtoull(buf, 10, &n);
3815 if (n != (sector_t)n)
3819 err = mddev_lock(mddev);
3822 if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
3826 mddev->recovery_cp = n;
3828 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
3830 mddev_unlock(mddev);
3833 static struct md_sysfs_entry md_resync_start =
3834 __ATTR_PREALLOC(resync_start, S_IRUGO|S_IWUSR,
3835 resync_start_show, resync_start_store);
3838 * The array state can be:
3841 * No devices, no size, no level
3842 * Equivalent to STOP_ARRAY ioctl
3844 * May have some settings, but array is not active
3845 * all IO results in error
3846 * When written, doesn't tear down array, but just stops it
3847 * suspended (not supported yet)
3848 * All IO requests will block. The array can be reconfigured.
3849 * Writing this, if accepted, will block until array is quiescent
3851 * no resync can happen. no superblocks get written.
3852 * write requests fail
3854 * like readonly, but behaves like 'clean' on a write request.
3856 * clean - no pending writes, but otherwise active.
3857 * When written to inactive array, starts without resync
3858 * If a write request arrives then
3859 * if metadata is known, mark 'dirty' and switch to 'active'.
3860 * if not known, block and switch to write-pending
3861 * If written to an active array that has pending writes, then fails.
3863 * fully active: IO and resync can be happening.
3864 * When written to inactive array, starts with resync
3867 * clean, but writes are blocked waiting for 'active' to be written.
3870 * like active, but no writes have been seen for a while (100msec).
3873 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
3874 write_pending, active_idle, bad_word};
3875 static char *array_states[] = {
3876 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3877 "write-pending", "active-idle", NULL };
3879 static int match_word(const char *word, char **list)
3882 for (n=0; list[n]; n++)
3883 if (cmd_match(word, list[n]))
3889 array_state_show(struct mddev *mddev, char *page)
3891 enum array_state st = inactive;
3904 else if (test_bit(MD_CHANGE_PENDING, &mddev->flags))
3906 else if (mddev->safemode)
3912 if (list_empty(&mddev->disks) &&
3913 mddev->raid_disks == 0 &&
3914 mddev->dev_sectors == 0)
3919 return sprintf(page, "%s\n", array_states[st]);
3922 static int do_md_stop(struct mddev *mddev, int ro, struct block_device *bdev);
3923 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev);
3924 static int do_md_run(struct mddev *mddev);
3925 static int restart_array(struct mddev *mddev);
3928 array_state_store(struct mddev *mddev, const char *buf, size_t len)
3931 enum array_state st = match_word(buf, array_states);
3933 if (mddev->pers && (st == active || st == clean) && mddev->ro != 1) {
3934 /* don't take reconfig_mutex when toggling between
3937 spin_lock(&mddev->lock);
3939 restart_array(mddev);
3940 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
3941 wake_up(&mddev->sb_wait);
3943 } else /* st == clean */ {
3944 restart_array(mddev);
3945 if (atomic_read(&mddev->writes_pending) == 0) {
3946 if (mddev->in_sync == 0) {
3948 if (mddev->safemode == 1)
3949 mddev->safemode = 0;
3950 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
3956 spin_unlock(&mddev->lock);
3959 err = mddev_lock(mddev);
3967 /* stopping an active array */
3968 err = do_md_stop(mddev, 0, NULL);
3971 /* stopping an active array */
3973 err = do_md_stop(mddev, 2, NULL);
3975 err = 0; /* already inactive */
3978 break; /* not supported yet */
3981 err = md_set_readonly(mddev, NULL);
3984 set_disk_ro(mddev->gendisk, 1);
3985 err = do_md_run(mddev);
3991 err = md_set_readonly(mddev, NULL);
3992 else if (mddev->ro == 1)
3993 err = restart_array(mddev);
3996 set_disk_ro(mddev->gendisk, 0);
4000 err = do_md_run(mddev);
4005 err = restart_array(mddev);
4008 spin_lock(&mddev->lock);
4009 if (atomic_read(&mddev->writes_pending) == 0) {
4010 if (mddev->in_sync == 0) {
4012 if (mddev->safemode == 1)
4013 mddev->safemode = 0;
4014 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
4019 spin_unlock(&mddev->lock);
4025 err = restart_array(mddev);
4028 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
4029 wake_up(&mddev->sb_wait);
4033 set_disk_ro(mddev->gendisk, 0);
4034 err = do_md_run(mddev);
4039 /* these cannot be set */
4044 if (mddev->hold_active == UNTIL_IOCTL)
4045 mddev->hold_active = 0;
4046 sysfs_notify_dirent_safe(mddev->sysfs_state);
4048 mddev_unlock(mddev);
4051 static struct md_sysfs_entry md_array_state =
4052 __ATTR_PREALLOC(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
4055 max_corrected_read_errors_show(struct mddev *mddev, char *page) {
4056 return sprintf(page, "%d\n",
4057 atomic_read(&mddev->max_corr_read_errors));
4061 max_corrected_read_errors_store(struct mddev *mddev, const char *buf, size_t len)
4066 rv = kstrtouint(buf, 10, &n);
4069 atomic_set(&mddev->max_corr_read_errors, n);
4073 static struct md_sysfs_entry max_corr_read_errors =
4074 __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show,
4075 max_corrected_read_errors_store);
4078 null_show(struct mddev *mddev, char *page)
4084 new_dev_store(struct mddev *mddev, const char *buf, size_t len)
4086 /* buf must be %d:%d\n? giving major and minor numbers */
4087 /* The new device is added to the array.
4088 * If the array has a persistent superblock, we read the
4089 * superblock to initialise info and check validity.
4090 * Otherwise, only checking done is that in bind_rdev_to_array,
4091 * which mainly checks size.
4094 int major = simple_strtoul(buf, &e, 10);
4097 struct md_rdev *rdev;
4100 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
4102 minor = simple_strtoul(e+1, &e, 10);
4103 if (*e && *e != '\n')
4105 dev = MKDEV(major, minor);
4106 if (major != MAJOR(dev) ||
4107 minor != MINOR(dev))
4110 flush_workqueue(md_misc_wq);
4112 err = mddev_lock(mddev);
4115 if (mddev->persistent) {
4116 rdev = md_import_device(dev, mddev->major_version,
4117 mddev->minor_version);
4118 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
4119 struct md_rdev *rdev0
4120 = list_entry(mddev->disks.next,
4121 struct md_rdev, same_set);
4122 err = super_types[mddev->major_version]
4123 .load_super(rdev, rdev0, mddev->minor_version);
4127 } else if (mddev->external)
4128 rdev = md_import_device(dev, -2, -1);
4130 rdev = md_import_device(dev, -1, -1);
4133 mddev_unlock(mddev);
4134 return PTR_ERR(rdev);
4136 err = bind_rdev_to_array(rdev, mddev);
4140 mddev_unlock(mddev);
4141 return err ? err : len;
4144 static struct md_sysfs_entry md_new_device =
4145 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
4148 bitmap_store(struct mddev *mddev, const char *buf, size_t len)
4151 unsigned long chunk, end_chunk;
4154 err = mddev_lock(mddev);
4159 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
4161 chunk = end_chunk = simple_strtoul(buf, &end, 0);
4162 if (buf == end) break;
4163 if (*end == '-') { /* range */
4165 end_chunk = simple_strtoul(buf, &end, 0);
4166 if (buf == end) break;
4168 if (*end && !isspace(*end)) break;
4169 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
4170 buf = skip_spaces(end);
4172 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
4174 mddev_unlock(mddev);
4178 static struct md_sysfs_entry md_bitmap =
4179 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
4182 size_show(struct mddev *mddev, char *page)
4184 return sprintf(page, "%llu\n",
4185 (unsigned long long)mddev->dev_sectors / 2);
4188 static int update_size(struct mddev *mddev, sector_t num_sectors);
4191 size_store(struct mddev *mddev, const char *buf, size_t len)
4193 /* If array is inactive, we can reduce the component size, but
4194 * not increase it (except from 0).
4195 * If array is active, we can try an on-line resize
4198 int err = strict_blocks_to_sectors(buf, §ors);
4202 err = mddev_lock(mddev);
4206 err = update_size(mddev, sectors);
4207 md_update_sb(mddev, 1);
4209 if (mddev->dev_sectors == 0 ||
4210 mddev->dev_sectors > sectors)
4211 mddev->dev_sectors = sectors;
4215 mddev_unlock(mddev);
4216 return err ? err : len;
4219 static struct md_sysfs_entry md_size =
4220 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
4222 /* Metadata version.
4224 * 'none' for arrays with no metadata (good luck...)
4225 * 'external' for arrays with externally managed metadata,
4226 * or N.M for internally known formats
4229 metadata_show(struct mddev *mddev, char *page)
4231 if (mddev->persistent)
4232 return sprintf(page, "%d.%d\n",
4233 mddev->major_version, mddev->minor_version);
4234 else if (mddev->external)
4235 return sprintf(page, "external:%s\n", mddev->metadata_type);
4237 return sprintf(page, "none\n");
4241 metadata_store(struct mddev *mddev, const char *buf, size_t len)
4246 /* Changing the details of 'external' metadata is
4247 * always permitted. Otherwise there must be
4248 * no devices attached to the array.
4251 err = mddev_lock(mddev);
4255 if (mddev->external && strncmp(buf, "external:", 9) == 0)
4257 else if (!list_empty(&mddev->disks))
4261 if (cmd_match(buf, "none")) {
4262 mddev->persistent = 0;
4263 mddev->external = 0;
4264 mddev->major_version = 0;
4265 mddev->minor_version = 90;
4268 if (strncmp(buf, "external:", 9) == 0) {
4269 size_t namelen = len-9;
4270 if (namelen >= sizeof(mddev->metadata_type))
4271 namelen = sizeof(mddev->metadata_type)-1;
4272 strncpy(mddev->metadata_type, buf+9, namelen);
4273 mddev->metadata_type[namelen] = 0;
4274 if (namelen && mddev->metadata_type[namelen-1] == '\n')
4275 mddev->metadata_type[--namelen] = 0;
4276 mddev->persistent = 0;
4277 mddev->external = 1;
4278 mddev->major_version = 0;
4279 mddev->minor_version = 90;
4282 major = simple_strtoul(buf, &e, 10);
4284 if (e==buf || *e != '.')
4287 minor = simple_strtoul(buf, &e, 10);
4288 if (e==buf || (*e && *e != '\n') )
4291 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
4293 mddev->major_version = major;
4294 mddev->minor_version = minor;
4295 mddev->persistent = 1;
4296 mddev->external = 0;
4299 mddev_unlock(mddev);
4303 static struct md_sysfs_entry md_metadata =
4304 __ATTR_PREALLOC(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
4307 action_show(struct mddev *mddev, char *page)
4309 char *type = "idle";
4310 unsigned long recovery = mddev->recovery;
4311 if (test_bit(MD_RECOVERY_FROZEN, &recovery))
4313 else if (test_bit(MD_RECOVERY_RUNNING, &recovery) ||
4314 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &recovery))) {
4315 if (test_bit(MD_RECOVERY_RESHAPE, &recovery))
4317 else if (test_bit(MD_RECOVERY_SYNC, &recovery)) {
4318 if (!test_bit(MD_RECOVERY_REQUESTED, &recovery))
4320 else if (test_bit(MD_RECOVERY_CHECK, &recovery))
4324 } else if (test_bit(MD_RECOVERY_RECOVER, &recovery))
4326 else if (mddev->reshape_position != MaxSector)
4329 return sprintf(page, "%s\n", type);
4333 action_store(struct mddev *mddev, const char *page, size_t len)
4335 if (!mddev->pers || !mddev->pers->sync_request)
4339 if (cmd_match(page, "idle") || cmd_match(page, "frozen")) {
4340 if (cmd_match(page, "frozen"))
4341 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4343 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4344 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
4345 mddev_lock(mddev) == 0) {
4346 flush_workqueue(md_misc_wq);
4347 if (mddev->sync_thread) {
4348 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4349 md_reap_sync_thread(mddev);
4351 mddev_unlock(mddev);
4353 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4355 else if (cmd_match(page, "resync"))
4356 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4357 else if (cmd_match(page, "recover")) {
4358 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4359 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
4360 } else if (cmd_match(page, "reshape")) {
4362 if (mddev->pers->start_reshape == NULL)
4364 err = mddev_lock(mddev);
4366 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4369 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4370 err = mddev->pers->start_reshape(mddev);
4372 mddev_unlock(mddev);
4376 sysfs_notify(&mddev->kobj, NULL, "degraded");
4378 if (cmd_match(page, "check"))
4379 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
4380 else if (!cmd_match(page, "repair"))
4382 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4383 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
4384 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
4386 if (mddev->ro == 2) {
4387 /* A write to sync_action is enough to justify
4388 * canceling read-auto mode
4391 md_wakeup_thread(mddev->sync_thread);
4393 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4394 md_wakeup_thread(mddev->thread);
4395 sysfs_notify_dirent_safe(mddev->sysfs_action);
4399 static struct md_sysfs_entry md_scan_mode =
4400 __ATTR_PREALLOC(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
4403 last_sync_action_show(struct mddev *mddev, char *page)
4405 return sprintf(page, "%s\n", mddev->last_sync_action);
4408 static struct md_sysfs_entry md_last_scan_mode = __ATTR_RO(last_sync_action);
4411 mismatch_cnt_show(struct mddev *mddev, char *page)
4413 return sprintf(page, "%llu\n",
4414 (unsigned long long)
4415 atomic64_read(&mddev->resync_mismatches));
4418 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
4421 sync_min_show(struct mddev *mddev, char *page)
4423 return sprintf(page, "%d (%s)\n", speed_min(mddev),
4424 mddev->sync_speed_min ? "local": "system");
4428 sync_min_store(struct mddev *mddev, const char *buf, size_t len)
4433 if (strncmp(buf, "system", 6)==0) {
4436 rv = kstrtouint(buf, 10, &min);
4442 mddev->sync_speed_min = min;
4446 static struct md_sysfs_entry md_sync_min =
4447 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
4450 sync_max_show(struct mddev *mddev, char *page)
4452 return sprintf(page, "%d (%s)\n", speed_max(mddev),
4453 mddev->sync_speed_max ? "local": "system");
4457 sync_max_store(struct mddev *mddev, const char *buf, size_t len)
4462 if (strncmp(buf, "system", 6)==0) {
4465 rv = kstrtouint(buf, 10, &max);
4471 mddev->sync_speed_max = max;
4475 static struct md_sysfs_entry md_sync_max =
4476 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
4479 degraded_show(struct mddev *mddev, char *page)
4481 return sprintf(page, "%d\n", mddev->degraded);
4483 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
4486 sync_force_parallel_show(struct mddev *mddev, char *page)
4488 return sprintf(page, "%d\n", mddev->parallel_resync);
4492 sync_force_parallel_store(struct mddev *mddev, const char *buf, size_t len)
4496 if (kstrtol(buf, 10, &n))
4499 if (n != 0 && n != 1)
4502 mddev->parallel_resync = n;
4504 if (mddev->sync_thread)
4505 wake_up(&resync_wait);
4510 /* force parallel resync, even with shared block devices */
4511 static struct md_sysfs_entry md_sync_force_parallel =
4512 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
4513 sync_force_parallel_show, sync_force_parallel_store);
4516 sync_speed_show(struct mddev *mddev, char *page)
4518 unsigned long resync, dt, db;
4519 if (mddev->curr_resync == 0)
4520 return sprintf(page, "none\n");
4521 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
4522 dt = (jiffies - mddev->resync_mark) / HZ;
4524 db = resync - mddev->resync_mark_cnt;
4525 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
4528 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
4531 sync_completed_show(struct mddev *mddev, char *page)
4533 unsigned long long max_sectors, resync;
4535 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4536 return sprintf(page, "none\n");
4538 if (mddev->curr_resync == 1 ||
4539 mddev->curr_resync == 2)
4540 return sprintf(page, "delayed\n");
4542 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
4543 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
4544 max_sectors = mddev->resync_max_sectors;
4546 max_sectors = mddev->dev_sectors;
4548 resync = mddev->curr_resync_completed;
4549 return sprintf(page, "%llu / %llu\n", resync, max_sectors);
4552 static struct md_sysfs_entry md_sync_completed =
4553 __ATTR_PREALLOC(sync_completed, S_IRUGO, sync_completed_show, NULL);
4556 min_sync_show(struct mddev *mddev, char *page)
4558 return sprintf(page, "%llu\n",
4559 (unsigned long long)mddev->resync_min);
4562 min_sync_store(struct mddev *mddev, const char *buf, size_t len)
4564 unsigned long long min;
4567 if (kstrtoull(buf, 10, &min))
4570 spin_lock(&mddev->lock);
4572 if (min > mddev->resync_max)
4576 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4579 /* Round down to multiple of 4K for safety */
4580 mddev->resync_min = round_down(min, 8);
4584 spin_unlock(&mddev->lock);
4588 static struct md_sysfs_entry md_min_sync =
4589 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
4592 max_sync_show(struct mddev *mddev, char *page)
4594 if (mddev->resync_max == MaxSector)
4595 return sprintf(page, "max\n");
4597 return sprintf(page, "%llu\n",
4598 (unsigned long long)mddev->resync_max);
4601 max_sync_store(struct mddev *mddev, const char *buf, size_t len)
4604 spin_lock(&mddev->lock);
4605 if (strncmp(buf, "max", 3) == 0)
4606 mddev->resync_max = MaxSector;
4608 unsigned long long max;
4612 if (kstrtoull(buf, 10, &max))
4614 if (max < mddev->resync_min)
4618 if (max < mddev->resync_max &&
4620 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4623 /* Must be a multiple of chunk_size */
4624 chunk = mddev->chunk_sectors;
4626 sector_t temp = max;
4629 if (sector_div(temp, chunk))
4632 mddev->resync_max = max;
4634 wake_up(&mddev->recovery_wait);
4637 spin_unlock(&mddev->lock);
4641 static struct md_sysfs_entry md_max_sync =
4642 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
4645 suspend_lo_show(struct mddev *mddev, char *page)
4647 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
4651 suspend_lo_store(struct mddev *mddev, const char *buf, size_t len)
4653 unsigned long long old, new;
4656 err = kstrtoull(buf, 10, &new);
4659 if (new != (sector_t)new)
4662 err = mddev_lock(mddev);
4666 if (mddev->pers == NULL ||
4667 mddev->pers->quiesce == NULL)
4669 old = mddev->suspend_lo;
4670 mddev->suspend_lo = new;
4672 /* Shrinking suspended region */
4673 mddev->pers->quiesce(mddev, 2);
4675 /* Expanding suspended region - need to wait */
4676 mddev->pers->quiesce(mddev, 1);
4677 mddev->pers->quiesce(mddev, 0);
4681 mddev_unlock(mddev);
4684 static struct md_sysfs_entry md_suspend_lo =
4685 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
4688 suspend_hi_show(struct mddev *mddev, char *page)
4690 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
4694 suspend_hi_store(struct mddev *mddev, const char *buf, size_t len)
4696 unsigned long long old, new;
4699 err = kstrtoull(buf, 10, &new);
4702 if (new != (sector_t)new)
4705 err = mddev_lock(mddev);
4709 if (mddev->pers == NULL ||
4710 mddev->pers->quiesce == NULL)
4712 old = mddev->suspend_hi;
4713 mddev->suspend_hi = new;
4715 /* Shrinking suspended region */
4716 mddev->pers->quiesce(mddev, 2);
4718 /* Expanding suspended region - need to wait */
4719 mddev->pers->quiesce(mddev, 1);
4720 mddev->pers->quiesce(mddev, 0);
4724 mddev_unlock(mddev);
4727 static struct md_sysfs_entry md_suspend_hi =
4728 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
4731 reshape_position_show(struct mddev *mddev, char *page)
4733 if (mddev->reshape_position != MaxSector)
4734 return sprintf(page, "%llu\n",
4735 (unsigned long long)mddev->reshape_position);
4736 strcpy(page, "none\n");
4741 reshape_position_store(struct mddev *mddev, const char *buf, size_t len)
4743 struct md_rdev *rdev;
4744 unsigned long long new;
4747 err = kstrtoull(buf, 10, &new);
4750 if (new != (sector_t)new)
4752 err = mddev_lock(mddev);
4758 mddev->reshape_position = new;
4759 mddev->delta_disks = 0;
4760 mddev->reshape_backwards = 0;
4761 mddev->new_level = mddev->level;
4762 mddev->new_layout = mddev->layout;
4763 mddev->new_chunk_sectors = mddev->chunk_sectors;
4764 rdev_for_each(rdev, mddev)
4765 rdev->new_data_offset = rdev->data_offset;
4768 mddev_unlock(mddev);
4772 static struct md_sysfs_entry md_reshape_position =
4773 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
4774 reshape_position_store);
4777 reshape_direction_show(struct mddev *mddev, char *page)
4779 return sprintf(page, "%s\n",
4780 mddev->reshape_backwards ? "backwards" : "forwards");
4784 reshape_direction_store(struct mddev *mddev, const char *buf, size_t len)
4789 if (cmd_match(buf, "forwards"))
4791 else if (cmd_match(buf, "backwards"))
4795 if (mddev->reshape_backwards == backwards)
4798 err = mddev_lock(mddev);
4801 /* check if we are allowed to change */
4802 if (mddev->delta_disks)
4804 else if (mddev->persistent &&
4805 mddev->major_version == 0)
4808 mddev->reshape_backwards = backwards;
4809 mddev_unlock(mddev);
4813 static struct md_sysfs_entry md_reshape_direction =
4814 __ATTR(reshape_direction, S_IRUGO|S_IWUSR, reshape_direction_show,
4815 reshape_direction_store);
4818 array_size_show(struct mddev *mddev, char *page)
4820 if (mddev->external_size)
4821 return sprintf(page, "%llu\n",
4822 (unsigned long long)mddev->array_sectors/2);
4824 return sprintf(page, "default\n");
4828 array_size_store(struct mddev *mddev, const char *buf, size_t len)
4833 err = mddev_lock(mddev);
4837 if (strncmp(buf, "default", 7) == 0) {
4839 sectors = mddev->pers->size(mddev, 0, 0);
4841 sectors = mddev->array_sectors;
4843 mddev->external_size = 0;
4845 if (strict_blocks_to_sectors(buf, §ors) < 0)
4847 else if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors)
4850 mddev->external_size = 1;
4854 mddev->array_sectors = sectors;
4856 set_capacity(mddev->gendisk, mddev->array_sectors);
4857 revalidate_disk(mddev->gendisk);
4860 mddev_unlock(mddev);
4864 static struct md_sysfs_entry md_array_size =
4865 __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show,
4868 static struct attribute *md_default_attrs[] = {
4871 &md_raid_disks.attr,
4872 &md_chunk_size.attr,
4874 &md_resync_start.attr,
4876 &md_new_device.attr,
4877 &md_safe_delay.attr,
4878 &md_array_state.attr,
4879 &md_reshape_position.attr,
4880 &md_reshape_direction.attr,
4881 &md_array_size.attr,
4882 &max_corr_read_errors.attr,
4886 static struct attribute *md_redundancy_attrs[] = {
4888 &md_last_scan_mode.attr,
4889 &md_mismatches.attr,
4892 &md_sync_speed.attr,
4893 &md_sync_force_parallel.attr,
4894 &md_sync_completed.attr,
4897 &md_suspend_lo.attr,
4898 &md_suspend_hi.attr,
4903 static struct attribute_group md_redundancy_group = {
4905 .attrs = md_redundancy_attrs,
4909 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
4911 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
4912 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
4917 spin_lock(&all_mddevs_lock);
4918 if (list_empty(&mddev->all_mddevs)) {
4919 spin_unlock(&all_mddevs_lock);
4923 spin_unlock(&all_mddevs_lock);
4925 rv = entry->show(mddev, page);
4931 md_attr_store(struct kobject *kobj, struct attribute *attr,
4932 const char *page, size_t length)
4934 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
4935 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
4940 if (!capable(CAP_SYS_ADMIN))
4942 spin_lock(&all_mddevs_lock);
4943 if (list_empty(&mddev->all_mddevs)) {
4944 spin_unlock(&all_mddevs_lock);
4948 spin_unlock(&all_mddevs_lock);
4949 rv = entry->store(mddev, page, length);
4954 static void md_free(struct kobject *ko)
4956 struct mddev *mddev = container_of(ko, struct mddev, kobj);
4958 if (mddev->sysfs_state)
4959 sysfs_put(mddev->sysfs_state);
4962 blk_cleanup_queue(mddev->queue);
4963 if (mddev->gendisk) {
4964 del_gendisk(mddev->gendisk);
4965 put_disk(mddev->gendisk);
4971 static const struct sysfs_ops md_sysfs_ops = {
4972 .show = md_attr_show,
4973 .store = md_attr_store,
4975 static struct kobj_type md_ktype = {
4977 .sysfs_ops = &md_sysfs_ops,
4978 .default_attrs = md_default_attrs,
4983 static void mddev_delayed_delete(struct work_struct *ws)
4985 struct mddev *mddev = container_of(ws, struct mddev, del_work);
4987 sysfs_remove_group(&mddev->kobj, &md_bitmap_group);
4988 kobject_del(&mddev->kobj);
4989 kobject_put(&mddev->kobj);
4992 static int md_alloc(dev_t dev, char *name)
4994 static DEFINE_MUTEX(disks_mutex);
4995 struct mddev *mddev = mddev_find(dev);
4996 struct gendisk *disk;
5005 partitioned = (MAJOR(mddev->unit) != MD_MAJOR);
5006 shift = partitioned ? MdpMinorShift : 0;
5007 unit = MINOR(mddev->unit) >> shift;
5009 /* wait for any previous instance of this device to be
5010 * completely removed (mddev_delayed_delete).
5012 flush_workqueue(md_misc_wq);
5014 mutex_lock(&disks_mutex);
5020 /* Need to ensure that 'name' is not a duplicate.
5022 struct mddev *mddev2;
5023 spin_lock(&all_mddevs_lock);
5025 list_for_each_entry(mddev2, &all_mddevs, all_mddevs)
5026 if (mddev2->gendisk &&
5027 strcmp(mddev2->gendisk->disk_name, name) == 0) {
5028 spin_unlock(&all_mddevs_lock);
5031 spin_unlock(&all_mddevs_lock);
5035 mddev->queue = blk_alloc_queue(GFP_KERNEL);
5038 mddev->queue->queuedata = mddev;
5040 blk_queue_make_request(mddev->queue, md_make_request);
5041 blk_set_stacking_limits(&mddev->queue->limits);
5043 disk = alloc_disk(1 << shift);
5045 blk_cleanup_queue(mddev->queue);
5046 mddev->queue = NULL;
5049 disk->major = MAJOR(mddev->unit);
5050 disk->first_minor = unit << shift;
5052 strcpy(disk->disk_name, name);
5053 else if (partitioned)
5054 sprintf(disk->disk_name, "md_d%d", unit);
5056 sprintf(disk->disk_name, "md%d", unit);
5057 disk->fops = &md_fops;
5058 disk->private_data = mddev;
5059 disk->queue = mddev->queue;
5060 blk_queue_flush(mddev->queue, REQ_FLUSH | REQ_FUA);
5061 /* Allow extended partitions. This makes the
5062 * 'mdp' device redundant, but we can't really
5065 disk->flags |= GENHD_FL_EXT_DEVT;
5066 mddev->gendisk = disk;
5067 /* As soon as we call add_disk(), another thread could get
5068 * through to md_open, so make sure it doesn't get too far
5070 mutex_lock(&mddev->open_mutex);
5073 error = kobject_init_and_add(&mddev->kobj, &md_ktype,
5074 &disk_to_dev(disk)->kobj, "%s", "md");
5076 /* This isn't possible, but as kobject_init_and_add is marked
5077 * __must_check, we must do something with the result
5079 printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
5083 if (mddev->kobj.sd &&
5084 sysfs_create_group(&mddev->kobj, &md_bitmap_group))
5085 printk(KERN_DEBUG "pointless warning\n");
5086 mutex_unlock(&mddev->open_mutex);
5088 mutex_unlock(&disks_mutex);
5089 if (!error && mddev->kobj.sd) {
5090 kobject_uevent(&mddev->kobj, KOBJ_ADD);
5091 mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state");
5097 static struct kobject *md_probe(dev_t dev, int *part, void *data)
5099 md_alloc(dev, NULL);
5103 static int add_named_array(const char *val, struct kernel_param *kp)
5105 /* val must be "md_*" where * is not all digits.
5106 * We allocate an array with a large free minor number, and
5107 * set the name to val. val must not already be an active name.
5109 int len = strlen(val);
5110 char buf[DISK_NAME_LEN];
5112 while (len && val[len-1] == '\n')
5114 if (len >= DISK_NAME_LEN)
5116 strlcpy(buf, val, len+1);
5117 if (strncmp(buf, "md_", 3) != 0)
5119 return md_alloc(0, buf);
5122 static void md_safemode_timeout(unsigned long data)
5124 struct mddev *mddev = (struct mddev *) data;
5126 if (!atomic_read(&mddev->writes_pending)) {
5127 mddev->safemode = 1;
5128 if (mddev->external)
5129 sysfs_notify_dirent_safe(mddev->sysfs_state);
5131 md_wakeup_thread(mddev->thread);
5134 static int start_dirty_degraded;
5136 int md_run(struct mddev *mddev)
5139 struct md_rdev *rdev;
5140 struct md_personality *pers;
5142 if (list_empty(&mddev->disks))
5143 /* cannot run an array with no devices.. */
5148 /* Cannot run until previous stop completes properly */
5149 if (mddev->sysfs_active)
5153 * Analyze all RAID superblock(s)
5155 if (!mddev->raid_disks) {
5156 if (!mddev->persistent)
5161 if (mddev->level != LEVEL_NONE)
5162 request_module("md-level-%d", mddev->level);
5163 else if (mddev->clevel[0])
5164 request_module("md-%s", mddev->clevel);
5167 * Drop all container device buffers, from now on
5168 * the only valid external interface is through the md
5171 rdev_for_each(rdev, mddev) {
5172 if (test_bit(Faulty, &rdev->flags))
5174 sync_blockdev(rdev->bdev);
5175 invalidate_bdev(rdev->bdev);
5177 /* perform some consistency tests on the device.
5178 * We don't want the data to overlap the metadata,
5179 * Internal Bitmap issues have been handled elsewhere.
5181 if (rdev->meta_bdev) {
5182 /* Nothing to check */;
5183 } else if (rdev->data_offset < rdev->sb_start) {
5184 if (mddev->dev_sectors &&
5185 rdev->data_offset + mddev->dev_sectors
5187 printk("md: %s: data overlaps metadata\n",
5192 if (rdev->sb_start + rdev->sb_size/512
5193 > rdev->data_offset) {
5194 printk("md: %s: metadata overlaps data\n",
5199 sysfs_notify_dirent_safe(rdev->sysfs_state);
5202 if (mddev->bio_set == NULL)
5203 mddev->bio_set = bioset_create(BIO_POOL_SIZE, 0);
5205 spin_lock(&pers_lock);
5206 pers = find_pers(mddev->level, mddev->clevel);
5207 if (!pers || !try_module_get(pers->owner)) {
5208 spin_unlock(&pers_lock);
5209 if (mddev->level != LEVEL_NONE)
5210 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
5213 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
5217 spin_unlock(&pers_lock);
5218 if (mddev->level != pers->level) {
5219 mddev->level = pers->level;
5220 mddev->new_level = pers->level;
5222 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
5224 if (mddev->reshape_position != MaxSector &&
5225 pers->start_reshape == NULL) {
5226 /* This personality cannot handle reshaping... */
5227 module_put(pers->owner);
5231 if (pers->sync_request) {
5232 /* Warn if this is a potentially silly
5235 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
5236 struct md_rdev *rdev2;
5239 rdev_for_each(rdev, mddev)
5240 rdev_for_each(rdev2, mddev) {
5242 rdev->bdev->bd_contains ==
5243 rdev2->bdev->bd_contains) {
5245 "%s: WARNING: %s appears to be"
5246 " on the same physical disk as"
5249 bdevname(rdev->bdev,b),
5250 bdevname(rdev2->bdev,b2));
5257 "True protection against single-disk"
5258 " failure might be compromised.\n");
5261 mddev->recovery = 0;
5262 /* may be over-ridden by personality */
5263 mddev->resync_max_sectors = mddev->dev_sectors;
5265 mddev->ok_start_degraded = start_dirty_degraded;
5267 if (start_readonly && mddev->ro == 0)
5268 mddev->ro = 2; /* read-only, but switch on first write */
5270 err = pers->run(mddev);
5272 printk(KERN_ERR "md: pers->run() failed ...\n");
5273 else if (pers->size(mddev, 0, 0) < mddev->array_sectors) {
5274 WARN_ONCE(!mddev->external_size, "%s: default size too small,"
5275 " but 'external_size' not in effect?\n", __func__);
5277 "md: invalid array_size %llu > default size %llu\n",
5278 (unsigned long long)mddev->array_sectors / 2,
5279 (unsigned long long)pers->size(mddev, 0, 0) / 2);
5282 if (err == 0 && pers->sync_request &&
5283 (mddev->bitmap_info.file || mddev->bitmap_info.offset)) {
5284 struct bitmap *bitmap;
5286 bitmap = bitmap_create(mddev, -1);
5287 if (IS_ERR(bitmap)) {
5288 err = PTR_ERR(bitmap);
5289 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
5290 mdname(mddev), err);
5292 mddev->bitmap = bitmap;
5296 mddev_detach(mddev);
5298 pers->free(mddev, mddev->private);
5299 mddev->private = NULL;
5300 module_put(pers->owner);
5301 bitmap_destroy(mddev);
5305 mddev->queue->backing_dev_info.congested_data = mddev;
5306 mddev->queue->backing_dev_info.congested_fn = md_congested;
5308 if (pers->sync_request) {
5309 if (mddev->kobj.sd &&
5310 sysfs_create_group(&mddev->kobj, &md_redundancy_group))
5312 "md: cannot register extra attributes for %s\n",
5314 mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action");
5315 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
5318 atomic_set(&mddev->writes_pending,0);
5319 atomic_set(&mddev->max_corr_read_errors,
5320 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS);
5321 mddev->safemode = 0;
5322 if (mddev_is_clustered(mddev))
5323 mddev->safemode_delay = 0;
5325 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
5328 spin_lock(&mddev->lock);
5331 spin_unlock(&mddev->lock);
5332 rdev_for_each(rdev, mddev)
5333 if (rdev->raid_disk >= 0)
5334 if (sysfs_link_rdev(mddev, rdev))
5335 /* failure here is OK */;
5337 if (mddev->degraded && !mddev->ro)
5338 /* This ensures that recovering status is reported immediately
5339 * via sysfs - until a lack of spares is confirmed.
5341 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
5342 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5344 if (mddev->flags & MD_UPDATE_SB_FLAGS)
5345 md_update_sb(mddev, 0);
5347 md_new_event(mddev);
5348 sysfs_notify_dirent_safe(mddev->sysfs_state);
5349 sysfs_notify_dirent_safe(mddev->sysfs_action);
5350 sysfs_notify(&mddev->kobj, NULL, "degraded");
5353 EXPORT_SYMBOL_GPL(md_run);
5355 static int do_md_run(struct mddev *mddev)
5359 err = md_run(mddev);
5362 err = bitmap_load(mddev);
5364 bitmap_destroy(mddev);
5368 if (mddev_is_clustered(mddev))
5369 md_allow_write(mddev);
5371 md_wakeup_thread(mddev->thread);
5372 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
5374 set_capacity(mddev->gendisk, mddev->array_sectors);
5375 revalidate_disk(mddev->gendisk);
5377 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
5382 static int restart_array(struct mddev *mddev)
5384 struct gendisk *disk = mddev->gendisk;
5386 /* Complain if it has no devices */
5387 if (list_empty(&mddev->disks))
5393 if (test_bit(MD_HAS_JOURNAL, &mddev->flags)) {
5394 struct md_rdev *rdev;
5395 bool has_journal = false;
5398 rdev_for_each_rcu(rdev, mddev) {
5399 if (test_bit(Journal, &rdev->flags) &&
5400 !test_bit(Faulty, &rdev->flags)) {
5407 /* Don't restart rw with journal missing/faulty */
5412 mddev->safemode = 0;
5414 set_disk_ro(disk, 0);
5415 printk(KERN_INFO "md: %s switched to read-write mode.\n",
5417 /* Kick recovery or resync if necessary */
5418 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5419 md_wakeup_thread(mddev->thread);
5420 md_wakeup_thread(mddev->sync_thread);
5421 sysfs_notify_dirent_safe(mddev->sysfs_state);
5425 static void md_clean(struct mddev *mddev)
5427 mddev->array_sectors = 0;
5428 mddev->external_size = 0;
5429 mddev->dev_sectors = 0;
5430 mddev->raid_disks = 0;
5431 mddev->recovery_cp = 0;
5432 mddev->resync_min = 0;
5433 mddev->resync_max = MaxSector;
5434 mddev->reshape_position = MaxSector;
5435 mddev->external = 0;
5436 mddev->persistent = 0;
5437 mddev->level = LEVEL_NONE;
5438 mddev->clevel[0] = 0;
5441 mddev->metadata_type[0] = 0;
5442 mddev->chunk_sectors = 0;
5443 mddev->ctime = mddev->utime = 0;
5445 mddev->max_disks = 0;
5447 mddev->can_decrease_events = 0;
5448 mddev->delta_disks = 0;
5449 mddev->reshape_backwards = 0;
5450 mddev->new_level = LEVEL_NONE;
5451 mddev->new_layout = 0;
5452 mddev->new_chunk_sectors = 0;
5453 mddev->curr_resync = 0;
5454 atomic64_set(&mddev->resync_mismatches, 0);
5455 mddev->suspend_lo = mddev->suspend_hi = 0;
5456 mddev->sync_speed_min = mddev->sync_speed_max = 0;
5457 mddev->recovery = 0;
5460 mddev->degraded = 0;
5461 mddev->safemode = 0;
5462 mddev->private = NULL;
5463 mddev->bitmap_info.offset = 0;
5464 mddev->bitmap_info.default_offset = 0;
5465 mddev->bitmap_info.default_space = 0;
5466 mddev->bitmap_info.chunksize = 0;
5467 mddev->bitmap_info.daemon_sleep = 0;
5468 mddev->bitmap_info.max_write_behind = 0;
5471 static void __md_stop_writes(struct mddev *mddev)
5473 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5474 flush_workqueue(md_misc_wq);
5475 if (mddev->sync_thread) {
5476 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5477 md_reap_sync_thread(mddev);
5480 del_timer_sync(&mddev->safemode_timer);
5482 bitmap_flush(mddev);
5483 md_super_wait(mddev);
5485 if (mddev->ro == 0 &&
5486 ((!mddev->in_sync && !mddev_is_clustered(mddev)) ||
5487 (mddev->flags & MD_UPDATE_SB_FLAGS))) {
5488 /* mark array as shutdown cleanly */
5489 if (!mddev_is_clustered(mddev))
5491 md_update_sb(mddev, 1);
5495 void md_stop_writes(struct mddev *mddev)
5497 mddev_lock_nointr(mddev);
5498 __md_stop_writes(mddev);
5499 mddev_unlock(mddev);
5501 EXPORT_SYMBOL_GPL(md_stop_writes);
5503 static void mddev_detach(struct mddev *mddev)
5505 struct bitmap *bitmap = mddev->bitmap;
5506 /* wait for behind writes to complete */
5507 if (bitmap && atomic_read(&bitmap->behind_writes) > 0) {
5508 printk(KERN_INFO "md:%s: behind writes in progress - waiting to stop.\n",
5510 /* need to kick something here to make sure I/O goes? */
5511 wait_event(bitmap->behind_wait,
5512 atomic_read(&bitmap->behind_writes) == 0);
5514 if (mddev->pers && mddev->pers->quiesce) {
5515 mddev->pers->quiesce(mddev, 1);
5516 mddev->pers->quiesce(mddev, 0);
5518 md_unregister_thread(&mddev->thread);
5520 blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/
5523 static void __md_stop(struct mddev *mddev)
5525 struct md_personality *pers = mddev->pers;
5526 mddev_detach(mddev);
5527 /* Ensure ->event_work is done */
5528 flush_workqueue(md_misc_wq);
5529 spin_lock(&mddev->lock);
5532 spin_unlock(&mddev->lock);
5533 pers->free(mddev, mddev->private);
5534 mddev->private = NULL;
5535 if (pers->sync_request && mddev->to_remove == NULL)
5536 mddev->to_remove = &md_redundancy_group;
5537 module_put(pers->owner);
5538 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5541 void md_stop(struct mddev *mddev)
5543 /* stop the array and free an attached data structures.
5544 * This is called from dm-raid
5547 bitmap_destroy(mddev);
5549 bioset_free(mddev->bio_set);
5552 EXPORT_SYMBOL_GPL(md_stop);
5554 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev)
5559 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
5561 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5562 md_wakeup_thread(mddev->thread);
5564 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5565 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5566 if (mddev->sync_thread)
5567 /* Thread might be blocked waiting for metadata update
5568 * which will now never happen */
5569 wake_up_process(mddev->sync_thread->tsk);
5571 if (mddev->external && test_bit(MD_CHANGE_PENDING, &mddev->flags))
5573 mddev_unlock(mddev);
5574 wait_event(resync_wait, !test_bit(MD_RECOVERY_RUNNING,
5576 wait_event(mddev->sb_wait,
5577 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
5578 mddev_lock_nointr(mddev);
5580 mutex_lock(&mddev->open_mutex);
5581 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
5582 mddev->sync_thread ||
5583 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
5584 (bdev && !test_bit(MD_STILL_CLOSED, &mddev->flags))) {
5585 printk("md: %s still in use.\n",mdname(mddev));
5587 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5588 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5589 md_wakeup_thread(mddev->thread);
5595 __md_stop_writes(mddev);
5601 set_disk_ro(mddev->gendisk, 1);
5602 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5603 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5604 md_wakeup_thread(mddev->thread);
5605 sysfs_notify_dirent_safe(mddev->sysfs_state);
5609 mutex_unlock(&mddev->open_mutex);
5614 * 0 - completely stop and dis-assemble array
5615 * 2 - stop but do not disassemble array
5617 static int do_md_stop(struct mddev *mddev, int mode,
5618 struct block_device *bdev)
5620 struct gendisk *disk = mddev->gendisk;
5621 struct md_rdev *rdev;
5624 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
5626 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5627 md_wakeup_thread(mddev->thread);
5629 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5630 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5631 if (mddev->sync_thread)
5632 /* Thread might be blocked waiting for metadata update
5633 * which will now never happen */
5634 wake_up_process(mddev->sync_thread->tsk);
5636 mddev_unlock(mddev);
5637 wait_event(resync_wait, (mddev->sync_thread == NULL &&
5638 !test_bit(MD_RECOVERY_RUNNING,
5639 &mddev->recovery)));
5640 mddev_lock_nointr(mddev);
5642 mutex_lock(&mddev->open_mutex);
5643 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
5644 mddev->sysfs_active ||
5645 mddev->sync_thread ||
5646 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
5647 (bdev && !test_bit(MD_STILL_CLOSED, &mddev->flags))) {
5648 printk("md: %s still in use.\n",mdname(mddev));
5649 mutex_unlock(&mddev->open_mutex);
5651 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5652 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5653 md_wakeup_thread(mddev->thread);
5659 set_disk_ro(disk, 0);
5661 __md_stop_writes(mddev);
5663 mddev->queue->backing_dev_info.congested_fn = NULL;
5665 /* tell userspace to handle 'inactive' */
5666 sysfs_notify_dirent_safe(mddev->sysfs_state);
5668 rdev_for_each(rdev, mddev)
5669 if (rdev->raid_disk >= 0)
5670 sysfs_unlink_rdev(mddev, rdev);
5672 set_capacity(disk, 0);
5673 mutex_unlock(&mddev->open_mutex);
5675 revalidate_disk(disk);
5680 mutex_unlock(&mddev->open_mutex);
5682 * Free resources if final stop
5685 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
5687 bitmap_destroy(mddev);
5688 if (mddev->bitmap_info.file) {
5689 struct file *f = mddev->bitmap_info.file;
5690 spin_lock(&mddev->lock);
5691 mddev->bitmap_info.file = NULL;
5692 spin_unlock(&mddev->lock);
5695 mddev->bitmap_info.offset = 0;
5697 export_array(mddev);
5700 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
5701 if (mddev->hold_active == UNTIL_STOP)
5702 mddev->hold_active = 0;
5704 md_new_event(mddev);
5705 sysfs_notify_dirent_safe(mddev->sysfs_state);
5710 static void autorun_array(struct mddev *mddev)
5712 struct md_rdev *rdev;
5715 if (list_empty(&mddev->disks))
5718 printk(KERN_INFO "md: running: ");
5720 rdev_for_each(rdev, mddev) {
5721 char b[BDEVNAME_SIZE];
5722 printk("<%s>", bdevname(rdev->bdev,b));
5726 err = do_md_run(mddev);
5728 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
5729 do_md_stop(mddev, 0, NULL);
5734 * lets try to run arrays based on all disks that have arrived
5735 * until now. (those are in pending_raid_disks)
5737 * the method: pick the first pending disk, collect all disks with
5738 * the same UUID, remove all from the pending list and put them into
5739 * the 'same_array' list. Then order this list based on superblock
5740 * update time (freshest comes first), kick out 'old' disks and
5741 * compare superblocks. If everything's fine then run it.
5743 * If "unit" is allocated, then bump its reference count
5745 static void autorun_devices(int part)
5747 struct md_rdev *rdev0, *rdev, *tmp;
5748 struct mddev *mddev;
5749 char b[BDEVNAME_SIZE];
5751 printk(KERN_INFO "md: autorun ...\n");
5752 while (!list_empty(&pending_raid_disks)) {
5755 LIST_HEAD(candidates);
5756 rdev0 = list_entry(pending_raid_disks.next,
5757 struct md_rdev, same_set);
5759 printk(KERN_INFO "md: considering %s ...\n",
5760 bdevname(rdev0->bdev,b));
5761 INIT_LIST_HEAD(&candidates);
5762 rdev_for_each_list(rdev, tmp, &pending_raid_disks)
5763 if (super_90_load(rdev, rdev0, 0) >= 0) {
5764 printk(KERN_INFO "md: adding %s ...\n",
5765 bdevname(rdev->bdev,b));
5766 list_move(&rdev->same_set, &candidates);
5769 * now we have a set of devices, with all of them having
5770 * mostly sane superblocks. It's time to allocate the
5774 dev = MKDEV(mdp_major,
5775 rdev0->preferred_minor << MdpMinorShift);
5776 unit = MINOR(dev) >> MdpMinorShift;
5778 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
5781 if (rdev0->preferred_minor != unit) {
5782 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
5783 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
5787 md_probe(dev, NULL, NULL);
5788 mddev = mddev_find(dev);
5789 if (!mddev || !mddev->gendisk) {
5793 "md: cannot allocate memory for md drive.\n");
5796 if (mddev_lock(mddev))
5797 printk(KERN_WARNING "md: %s locked, cannot run\n",
5799 else if (mddev->raid_disks || mddev->major_version
5800 || !list_empty(&mddev->disks)) {
5802 "md: %s already running, cannot run %s\n",
5803 mdname(mddev), bdevname(rdev0->bdev,b));
5804 mddev_unlock(mddev);
5806 printk(KERN_INFO "md: created %s\n", mdname(mddev));
5807 mddev->persistent = 1;
5808 rdev_for_each_list(rdev, tmp, &candidates) {
5809 list_del_init(&rdev->same_set);
5810 if (bind_rdev_to_array(rdev, mddev))
5813 autorun_array(mddev);
5814 mddev_unlock(mddev);
5816 /* on success, candidates will be empty, on error
5819 rdev_for_each_list(rdev, tmp, &candidates) {
5820 list_del_init(&rdev->same_set);
5825 printk(KERN_INFO "md: ... autorun DONE.\n");
5827 #endif /* !MODULE */
5829 static int get_version(void __user *arg)
5833 ver.major = MD_MAJOR_VERSION;
5834 ver.minor = MD_MINOR_VERSION;
5835 ver.patchlevel = MD_PATCHLEVEL_VERSION;
5837 if (copy_to_user(arg, &ver, sizeof(ver)))
5843 static int get_array_info(struct mddev *mddev, void __user *arg)
5845 mdu_array_info_t info;
5846 int nr,working,insync,failed,spare;
5847 struct md_rdev *rdev;
5849 nr = working = insync = failed = spare = 0;
5851 rdev_for_each_rcu(rdev, mddev) {
5853 if (test_bit(Faulty, &rdev->flags))
5857 if (test_bit(In_sync, &rdev->flags))
5865 info.major_version = mddev->major_version;
5866 info.minor_version = mddev->minor_version;
5867 info.patch_version = MD_PATCHLEVEL_VERSION;
5868 info.ctime = mddev->ctime;
5869 info.level = mddev->level;
5870 info.size = mddev->dev_sectors / 2;
5871 if (info.size != mddev->dev_sectors / 2) /* overflow */
5874 info.raid_disks = mddev->raid_disks;
5875 info.md_minor = mddev->md_minor;
5876 info.not_persistent= !mddev->persistent;
5878 info.utime = mddev->utime;
5881 info.state = (1<<MD_SB_CLEAN);
5882 if (mddev->bitmap && mddev->bitmap_info.offset)
5883 info.state |= (1<<MD_SB_BITMAP_PRESENT);
5884 if (mddev_is_clustered(mddev))
5885 info.state |= (1<<MD_SB_CLUSTERED);
5886 info.active_disks = insync;
5887 info.working_disks = working;
5888 info.failed_disks = failed;
5889 info.spare_disks = spare;
5891 info.layout = mddev->layout;
5892 info.chunk_size = mddev->chunk_sectors << 9;
5894 if (copy_to_user(arg, &info, sizeof(info)))
5900 static int get_bitmap_file(struct mddev *mddev, void __user * arg)
5902 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
5906 file = kzalloc(sizeof(*file), GFP_NOIO);
5911 spin_lock(&mddev->lock);
5912 /* bitmap enabled */
5913 if (mddev->bitmap_info.file) {
5914 ptr = file_path(mddev->bitmap_info.file, file->pathname,
5915 sizeof(file->pathname));
5919 memmove(file->pathname, ptr,
5920 sizeof(file->pathname)-(ptr-file->pathname));
5922 spin_unlock(&mddev->lock);
5925 copy_to_user(arg, file, sizeof(*file)))
5932 static int get_disk_info(struct mddev *mddev, void __user * arg)
5934 mdu_disk_info_t info;
5935 struct md_rdev *rdev;
5937 if (copy_from_user(&info, arg, sizeof(info)))
5941 rdev = md_find_rdev_nr_rcu(mddev, info.number);
5943 info.major = MAJOR(rdev->bdev->bd_dev);
5944 info.minor = MINOR(rdev->bdev->bd_dev);
5945 info.raid_disk = rdev->raid_disk;
5947 if (test_bit(Faulty, &rdev->flags))
5948 info.state |= (1<<MD_DISK_FAULTY);
5949 else if (test_bit(In_sync, &rdev->flags)) {
5950 info.state |= (1<<MD_DISK_ACTIVE);
5951 info.state |= (1<<MD_DISK_SYNC);
5953 if (test_bit(Journal, &rdev->flags))
5954 info.state |= (1<<MD_DISK_JOURNAL);
5955 if (test_bit(WriteMostly, &rdev->flags))
5956 info.state |= (1<<MD_DISK_WRITEMOSTLY);
5958 info.major = info.minor = 0;
5959 info.raid_disk = -1;
5960 info.state = (1<<MD_DISK_REMOVED);
5964 if (copy_to_user(arg, &info, sizeof(info)))
5970 static int add_new_disk(struct mddev *mddev, mdu_disk_info_t *info)
5972 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
5973 struct md_rdev *rdev;
5974 dev_t dev = MKDEV(info->major,info->minor);
5976 if (mddev_is_clustered(mddev) &&
5977 !(info->state & ((1 << MD_DISK_CLUSTER_ADD) | (1 << MD_DISK_CANDIDATE)))) {
5978 pr_err("%s: Cannot add to clustered mddev.\n",
5983 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
5986 if (!mddev->raid_disks) {
5988 /* expecting a device which has a superblock */
5989 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
5992 "md: md_import_device returned %ld\n",
5994 return PTR_ERR(rdev);
5996 if (!list_empty(&mddev->disks)) {
5997 struct md_rdev *rdev0
5998 = list_entry(mddev->disks.next,
5999 struct md_rdev, same_set);
6000 err = super_types[mddev->major_version]
6001 .load_super(rdev, rdev0, mddev->minor_version);
6004 "md: %s has different UUID to %s\n",
6005 bdevname(rdev->bdev,b),
6006 bdevname(rdev0->bdev,b2));
6011 err = bind_rdev_to_array(rdev, mddev);
6018 * add_new_disk can be used once the array is assembled
6019 * to add "hot spares". They must already have a superblock
6024 if (!mddev->pers->hot_add_disk) {
6026 "%s: personality does not support diskops!\n",
6030 if (mddev->persistent)
6031 rdev = md_import_device(dev, mddev->major_version,
6032 mddev->minor_version);
6034 rdev = md_import_device(dev, -1, -1);
6037 "md: md_import_device returned %ld\n",
6039 return PTR_ERR(rdev);
6041 /* set saved_raid_disk if appropriate */
6042 if (!mddev->persistent) {
6043 if (info->state & (1<<MD_DISK_SYNC) &&
6044 info->raid_disk < mddev->raid_disks) {
6045 rdev->raid_disk = info->raid_disk;
6046 set_bit(In_sync, &rdev->flags);
6047 clear_bit(Bitmap_sync, &rdev->flags);
6049 rdev->raid_disk = -1;
6050 rdev->saved_raid_disk = rdev->raid_disk;
6052 super_types[mddev->major_version].
6053 validate_super(mddev, rdev);
6054 if ((info->state & (1<<MD_DISK_SYNC)) &&
6055 rdev->raid_disk != info->raid_disk) {
6056 /* This was a hot-add request, but events doesn't
6057 * match, so reject it.
6063 clear_bit(In_sync, &rdev->flags); /* just to be sure */
6064 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
6065 set_bit(WriteMostly, &rdev->flags);
6067 clear_bit(WriteMostly, &rdev->flags);
6069 if (info->state & (1<<MD_DISK_JOURNAL))
6070 set_bit(Journal, &rdev->flags);
6072 * check whether the device shows up in other nodes
6074 if (mddev_is_clustered(mddev)) {
6075 if (info->state & (1 << MD_DISK_CANDIDATE))
6076 set_bit(Candidate, &rdev->flags);
6077 else if (info->state & (1 << MD_DISK_CLUSTER_ADD)) {
6078 /* --add initiated by this node */
6079 err = md_cluster_ops->add_new_disk(mddev, rdev);
6087 rdev->raid_disk = -1;
6088 err = bind_rdev_to_array(rdev, mddev);
6093 if (mddev_is_clustered(mddev)) {
6094 if (info->state & (1 << MD_DISK_CANDIDATE))
6095 md_cluster_ops->new_disk_ack(mddev, (err == 0));
6098 md_cluster_ops->add_new_disk_cancel(mddev);
6100 err = add_bound_rdev(rdev);
6104 err = add_bound_rdev(rdev);
6109 /* otherwise, add_new_disk is only allowed
6110 * for major_version==0 superblocks
6112 if (mddev->major_version != 0) {
6113 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
6118 if (!(info->state & (1<<MD_DISK_FAULTY))) {
6120 rdev = md_import_device(dev, -1, 0);
6123 "md: error, md_import_device() returned %ld\n",
6125 return PTR_ERR(rdev);
6127 rdev->desc_nr = info->number;
6128 if (info->raid_disk < mddev->raid_disks)
6129 rdev->raid_disk = info->raid_disk;
6131 rdev->raid_disk = -1;
6133 if (rdev->raid_disk < mddev->raid_disks)
6134 if (info->state & (1<<MD_DISK_SYNC))
6135 set_bit(In_sync, &rdev->flags);
6137 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
6138 set_bit(WriteMostly, &rdev->flags);
6140 if (!mddev->persistent) {
6141 printk(KERN_INFO "md: nonpersistent superblock ...\n");
6142 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
6144 rdev->sb_start = calc_dev_sboffset(rdev);
6145 rdev->sectors = rdev->sb_start;
6147 err = bind_rdev_to_array(rdev, mddev);
6157 static int hot_remove_disk(struct mddev *mddev, dev_t dev)
6159 char b[BDEVNAME_SIZE];
6160 struct md_rdev *rdev;
6166 rdev = find_rdev(mddev, dev);
6170 if (mddev_is_clustered(mddev))
6171 ret = md_cluster_ops->metadata_update_start(mddev);
6173 if (rdev->raid_disk < 0)
6176 clear_bit(Blocked, &rdev->flags);
6177 remove_and_add_spares(mddev, rdev);
6179 if (rdev->raid_disk >= 0)
6183 if (mddev_is_clustered(mddev) && ret == 0)
6184 md_cluster_ops->remove_disk(mddev, rdev);
6186 md_kick_rdev_from_array(rdev);
6187 md_update_sb(mddev, 1);
6188 md_new_event(mddev);
6192 if (mddev_is_clustered(mddev) && ret == 0)
6193 md_cluster_ops->metadata_update_cancel(mddev);
6195 printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n",
6196 bdevname(rdev->bdev,b), mdname(mddev));
6200 static int hot_add_disk(struct mddev *mddev, dev_t dev)
6202 char b[BDEVNAME_SIZE];
6204 struct md_rdev *rdev;
6209 if (mddev->major_version != 0) {
6210 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
6211 " version-0 superblocks.\n",
6215 if (!mddev->pers->hot_add_disk) {
6217 "%s: personality does not support diskops!\n",
6222 rdev = md_import_device(dev, -1, 0);
6225 "md: error, md_import_device() returned %ld\n",
6230 if (mddev->persistent)
6231 rdev->sb_start = calc_dev_sboffset(rdev);
6233 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
6235 rdev->sectors = rdev->sb_start;
6237 if (test_bit(Faulty, &rdev->flags)) {
6239 "md: can not hot-add faulty %s disk to %s!\n",
6240 bdevname(rdev->bdev,b), mdname(mddev));
6245 clear_bit(In_sync, &rdev->flags);
6247 rdev->saved_raid_disk = -1;
6248 err = bind_rdev_to_array(rdev, mddev);
6253 * The rest should better be atomic, we can have disk failures
6254 * noticed in interrupt contexts ...
6257 rdev->raid_disk = -1;
6259 md_update_sb(mddev, 1);
6261 * Kick recovery, maybe this spare has to be added to the
6262 * array immediately.
6264 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6265 md_wakeup_thread(mddev->thread);
6266 md_new_event(mddev);
6274 static int set_bitmap_file(struct mddev *mddev, int fd)
6279 if (!mddev->pers->quiesce || !mddev->thread)
6281 if (mddev->recovery || mddev->sync_thread)
6283 /* we should be able to change the bitmap.. */
6287 struct inode *inode;
6290 if (mddev->bitmap || mddev->bitmap_info.file)
6291 return -EEXIST; /* cannot add when bitmap is present */
6295 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
6300 inode = f->f_mapping->host;
6301 if (!S_ISREG(inode->i_mode)) {
6302 printk(KERN_ERR "%s: error: bitmap file must be a regular file\n",
6305 } else if (!(f->f_mode & FMODE_WRITE)) {
6306 printk(KERN_ERR "%s: error: bitmap file must open for write\n",
6309 } else if (atomic_read(&inode->i_writecount) != 1) {
6310 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
6318 mddev->bitmap_info.file = f;
6319 mddev->bitmap_info.offset = 0; /* file overrides offset */
6320 } else if (mddev->bitmap == NULL)
6321 return -ENOENT; /* cannot remove what isn't there */
6324 mddev->pers->quiesce(mddev, 1);
6326 struct bitmap *bitmap;
6328 bitmap = bitmap_create(mddev, -1);
6329 if (!IS_ERR(bitmap)) {
6330 mddev->bitmap = bitmap;
6331 err = bitmap_load(mddev);
6333 err = PTR_ERR(bitmap);
6335 if (fd < 0 || err) {
6336 bitmap_destroy(mddev);
6337 fd = -1; /* make sure to put the file */
6339 mddev->pers->quiesce(mddev, 0);
6342 struct file *f = mddev->bitmap_info.file;
6344 spin_lock(&mddev->lock);
6345 mddev->bitmap_info.file = NULL;
6346 spin_unlock(&mddev->lock);
6355 * set_array_info is used two different ways
6356 * The original usage is when creating a new array.
6357 * In this usage, raid_disks is > 0 and it together with
6358 * level, size, not_persistent,layout,chunksize determine the
6359 * shape of the array.
6360 * This will always create an array with a type-0.90.0 superblock.
6361 * The newer usage is when assembling an array.
6362 * In this case raid_disks will be 0, and the major_version field is
6363 * use to determine which style super-blocks are to be found on the devices.
6364 * The minor and patch _version numbers are also kept incase the
6365 * super_block handler wishes to interpret them.
6367 static int set_array_info(struct mddev *mddev, mdu_array_info_t *info)
6370 if (info->raid_disks == 0) {
6371 /* just setting version number for superblock loading */
6372 if (info->major_version < 0 ||
6373 info->major_version >= ARRAY_SIZE(super_types) ||
6374 super_types[info->major_version].name == NULL) {
6375 /* maybe try to auto-load a module? */
6377 "md: superblock version %d not known\n",
6378 info->major_version);
6381 mddev->major_version = info->major_version;
6382 mddev->minor_version = info->minor_version;
6383 mddev->patch_version = info->patch_version;
6384 mddev->persistent = !info->not_persistent;
6385 /* ensure mddev_put doesn't delete this now that there
6386 * is some minimal configuration.
6388 mddev->ctime = get_seconds();
6391 mddev->major_version = MD_MAJOR_VERSION;
6392 mddev->minor_version = MD_MINOR_VERSION;
6393 mddev->patch_version = MD_PATCHLEVEL_VERSION;
6394 mddev->ctime = get_seconds();
6396 mddev->level = info->level;
6397 mddev->clevel[0] = 0;
6398 mddev->dev_sectors = 2 * (sector_t)info->size;
6399 mddev->raid_disks = info->raid_disks;
6400 /* don't set md_minor, it is determined by which /dev/md* was
6403 if (info->state & (1<<MD_SB_CLEAN))
6404 mddev->recovery_cp = MaxSector;
6406 mddev->recovery_cp = 0;
6407 mddev->persistent = ! info->not_persistent;
6408 mddev->external = 0;
6410 mddev->layout = info->layout;
6411 mddev->chunk_sectors = info->chunk_size >> 9;
6413 mddev->max_disks = MD_SB_DISKS;
6415 if (mddev->persistent)
6417 set_bit(MD_CHANGE_DEVS, &mddev->flags);
6419 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
6420 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
6421 mddev->bitmap_info.offset = 0;
6423 mddev->reshape_position = MaxSector;
6426 * Generate a 128 bit UUID
6428 get_random_bytes(mddev->uuid, 16);
6430 mddev->new_level = mddev->level;
6431 mddev->new_chunk_sectors = mddev->chunk_sectors;
6432 mddev->new_layout = mddev->layout;
6433 mddev->delta_disks = 0;
6434 mddev->reshape_backwards = 0;
6439 void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors)
6441 WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__);
6443 if (mddev->external_size)
6446 mddev->array_sectors = array_sectors;
6448 EXPORT_SYMBOL(md_set_array_sectors);
6450 static int update_size(struct mddev *mddev, sector_t num_sectors)
6452 struct md_rdev *rdev;
6454 int fit = (num_sectors == 0);
6456 if (mddev->pers->resize == NULL)
6458 /* The "num_sectors" is the number of sectors of each device that
6459 * is used. This can only make sense for arrays with redundancy.
6460 * linear and raid0 always use whatever space is available. We can only
6461 * consider changing this number if no resync or reconstruction is
6462 * happening, and if the new size is acceptable. It must fit before the
6463 * sb_start or, if that is <data_offset, it must fit before the size
6464 * of each device. If num_sectors is zero, we find the largest size
6467 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
6473 rdev_for_each(rdev, mddev) {
6474 sector_t avail = rdev->sectors;
6476 if (fit && (num_sectors == 0 || num_sectors > avail))
6477 num_sectors = avail;
6478 if (avail < num_sectors)
6481 rv = mddev->pers->resize(mddev, num_sectors);
6483 revalidate_disk(mddev->gendisk);
6487 static int update_raid_disks(struct mddev *mddev, int raid_disks)
6490 struct md_rdev *rdev;
6491 /* change the number of raid disks */
6492 if (mddev->pers->check_reshape == NULL)
6496 if (raid_disks <= 0 ||
6497 (mddev->max_disks && raid_disks >= mddev->max_disks))
6499 if (mddev->sync_thread ||
6500 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
6501 mddev->reshape_position != MaxSector)
6504 rdev_for_each(rdev, mddev) {
6505 if (mddev->raid_disks < raid_disks &&
6506 rdev->data_offset < rdev->new_data_offset)
6508 if (mddev->raid_disks > raid_disks &&
6509 rdev->data_offset > rdev->new_data_offset)
6513 mddev->delta_disks = raid_disks - mddev->raid_disks;
6514 if (mddev->delta_disks < 0)
6515 mddev->reshape_backwards = 1;
6516 else if (mddev->delta_disks > 0)
6517 mddev->reshape_backwards = 0;
6519 rv = mddev->pers->check_reshape(mddev);
6521 mddev->delta_disks = 0;
6522 mddev->reshape_backwards = 0;
6528 * update_array_info is used to change the configuration of an
6530 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
6531 * fields in the info are checked against the array.
6532 * Any differences that cannot be handled will cause an error.
6533 * Normally, only one change can be managed at a time.
6535 static int update_array_info(struct mddev *mddev, mdu_array_info_t *info)
6541 /* calculate expected state,ignoring low bits */
6542 if (mddev->bitmap && mddev->bitmap_info.offset)
6543 state |= (1 << MD_SB_BITMAP_PRESENT);
6545 if (mddev->major_version != info->major_version ||
6546 mddev->minor_version != info->minor_version ||
6547 /* mddev->patch_version != info->patch_version || */
6548 mddev->ctime != info->ctime ||
6549 mddev->level != info->level ||
6550 /* mddev->layout != info->layout || */
6551 mddev->persistent != !info->not_persistent ||
6552 mddev->chunk_sectors != info->chunk_size >> 9 ||
6553 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
6554 ((state^info->state) & 0xfffffe00)
6557 /* Check there is only one change */
6558 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
6560 if (mddev->raid_disks != info->raid_disks)
6562 if (mddev->layout != info->layout)
6564 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT))
6571 if (mddev->layout != info->layout) {
6573 * we don't need to do anything at the md level, the
6574 * personality will take care of it all.
6576 if (mddev->pers->check_reshape == NULL)
6579 mddev->new_layout = info->layout;
6580 rv = mddev->pers->check_reshape(mddev);
6582 mddev->new_layout = mddev->layout;
6586 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
6587 rv = update_size(mddev, (sector_t)info->size * 2);
6589 if (mddev->raid_disks != info->raid_disks)
6590 rv = update_raid_disks(mddev, info->raid_disks);
6592 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
6593 if (mddev->pers->quiesce == NULL || mddev->thread == NULL) {
6597 if (mddev->recovery || mddev->sync_thread) {
6601 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
6602 struct bitmap *bitmap;
6603 /* add the bitmap */
6604 if (mddev->bitmap) {
6608 if (mddev->bitmap_info.default_offset == 0) {
6612 mddev->bitmap_info.offset =
6613 mddev->bitmap_info.default_offset;
6614 mddev->bitmap_info.space =
6615 mddev->bitmap_info.default_space;
6616 mddev->pers->quiesce(mddev, 1);
6617 bitmap = bitmap_create(mddev, -1);
6618 if (!IS_ERR(bitmap)) {
6619 mddev->bitmap = bitmap;
6620 rv = bitmap_load(mddev);
6622 rv = PTR_ERR(bitmap);
6624 bitmap_destroy(mddev);
6625 mddev->pers->quiesce(mddev, 0);
6627 /* remove the bitmap */
6628 if (!mddev->bitmap) {
6632 if (mddev->bitmap->storage.file) {
6636 mddev->pers->quiesce(mddev, 1);
6637 bitmap_destroy(mddev);
6638 mddev->pers->quiesce(mddev, 0);
6639 mddev->bitmap_info.offset = 0;
6642 md_update_sb(mddev, 1);
6648 static int set_disk_faulty(struct mddev *mddev, dev_t dev)
6650 struct md_rdev *rdev;
6653 if (mddev->pers == NULL)
6657 rdev = find_rdev_rcu(mddev, dev);
6661 md_error(mddev, rdev);
6662 if (!test_bit(Faulty, &rdev->flags))
6670 * We have a problem here : there is no easy way to give a CHS
6671 * virtual geometry. We currently pretend that we have a 2 heads
6672 * 4 sectors (with a BIG number of cylinders...). This drives
6673 * dosfs just mad... ;-)
6675 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
6677 struct mddev *mddev = bdev->bd_disk->private_data;
6681 geo->cylinders = mddev->array_sectors / 8;
6685 static inline bool md_ioctl_valid(unsigned int cmd)
6690 case GET_ARRAY_INFO:
6691 case GET_BITMAP_FILE:
6694 case HOT_REMOVE_DISK:
6697 case RESTART_ARRAY_RW:
6699 case SET_ARRAY_INFO:
6700 case SET_BITMAP_FILE:
6701 case SET_DISK_FAULTY:
6704 case CLUSTERED_DISK_NACK:
6711 static int md_ioctl(struct block_device *bdev, fmode_t mode,
6712 unsigned int cmd, unsigned long arg)
6715 void __user *argp = (void __user *)arg;
6716 struct mddev *mddev = NULL;
6719 if (!md_ioctl_valid(cmd))
6724 case GET_ARRAY_INFO:
6728 if (!capable(CAP_SYS_ADMIN))
6733 * Commands dealing with the RAID driver but not any
6738 err = get_version(argp);
6744 autostart_arrays(arg);
6751 * Commands creating/starting a new array:
6754 mddev = bdev->bd_disk->private_data;
6761 /* Some actions do not requires the mutex */
6763 case GET_ARRAY_INFO:
6764 if (!mddev->raid_disks && !mddev->external)
6767 err = get_array_info(mddev, argp);
6771 if (!mddev->raid_disks && !mddev->external)
6774 err = get_disk_info(mddev, argp);
6777 case SET_DISK_FAULTY:
6778 err = set_disk_faulty(mddev, new_decode_dev(arg));
6781 case GET_BITMAP_FILE:
6782 err = get_bitmap_file(mddev, argp);
6787 if (cmd == ADD_NEW_DISK)
6788 /* need to ensure md_delayed_delete() has completed */
6789 flush_workqueue(md_misc_wq);
6791 if (cmd == HOT_REMOVE_DISK)
6792 /* need to ensure recovery thread has run */
6793 wait_event_interruptible_timeout(mddev->sb_wait,
6794 !test_bit(MD_RECOVERY_NEEDED,
6796 msecs_to_jiffies(5000));
6797 if (cmd == STOP_ARRAY || cmd == STOP_ARRAY_RO) {
6798 /* Need to flush page cache, and ensure no-one else opens
6801 mutex_lock(&mddev->open_mutex);
6802 if (mddev->pers && atomic_read(&mddev->openers) > 1) {
6803 mutex_unlock(&mddev->open_mutex);
6807 set_bit(MD_STILL_CLOSED, &mddev->flags);
6808 mutex_unlock(&mddev->open_mutex);
6809 sync_blockdev(bdev);
6811 err = mddev_lock(mddev);
6814 "md: ioctl lock interrupted, reason %d, cmd %d\n",
6819 if (cmd == SET_ARRAY_INFO) {
6820 mdu_array_info_t info;
6822 memset(&info, 0, sizeof(info));
6823 else if (copy_from_user(&info, argp, sizeof(info))) {
6828 err = update_array_info(mddev, &info);
6830 printk(KERN_WARNING "md: couldn't update"
6831 " array info. %d\n", err);
6836 if (!list_empty(&mddev->disks)) {
6838 "md: array %s already has disks!\n",
6843 if (mddev->raid_disks) {
6845 "md: array %s already initialised!\n",
6850 err = set_array_info(mddev, &info);
6852 printk(KERN_WARNING "md: couldn't set"
6853 " array info. %d\n", err);
6860 * Commands querying/configuring an existing array:
6862 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
6863 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
6864 if ((!mddev->raid_disks && !mddev->external)
6865 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
6866 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
6867 && cmd != GET_BITMAP_FILE) {
6873 * Commands even a read-only array can execute:
6876 case RESTART_ARRAY_RW:
6877 err = restart_array(mddev);
6881 err = do_md_stop(mddev, 0, bdev);
6885 err = md_set_readonly(mddev, bdev);
6888 case HOT_REMOVE_DISK:
6889 err = hot_remove_disk(mddev, new_decode_dev(arg));
6893 /* We can support ADD_NEW_DISK on read-only arrays
6894 * on if we are re-adding a preexisting device.
6895 * So require mddev->pers and MD_DISK_SYNC.
6898 mdu_disk_info_t info;
6899 if (copy_from_user(&info, argp, sizeof(info)))
6901 else if (!(info.state & (1<<MD_DISK_SYNC)))
6902 /* Need to clear read-only for this */
6905 err = add_new_disk(mddev, &info);
6911 if (get_user(ro, (int __user *)(arg))) {
6917 /* if the bdev is going readonly the value of mddev->ro
6918 * does not matter, no writes are coming
6923 /* are we are already prepared for writes? */
6927 /* transitioning to readauto need only happen for
6928 * arrays that call md_write_start
6931 err = restart_array(mddev);
6934 set_disk_ro(mddev->gendisk, 0);
6941 * The remaining ioctls are changing the state of the
6942 * superblock, so we do not allow them on read-only arrays.
6944 if (mddev->ro && mddev->pers) {
6945 if (mddev->ro == 2) {
6947 sysfs_notify_dirent_safe(mddev->sysfs_state);
6948 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6949 /* mddev_unlock will wake thread */
6950 /* If a device failed while we were read-only, we
6951 * need to make sure the metadata is updated now.
6953 if (test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
6954 mddev_unlock(mddev);
6955 wait_event(mddev->sb_wait,
6956 !test_bit(MD_CHANGE_DEVS, &mddev->flags) &&
6957 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
6958 mddev_lock_nointr(mddev);
6969 mdu_disk_info_t info;
6970 if (copy_from_user(&info, argp, sizeof(info)))
6973 err = add_new_disk(mddev, &info);
6977 case CLUSTERED_DISK_NACK:
6978 if (mddev_is_clustered(mddev))
6979 md_cluster_ops->new_disk_ack(mddev, false);
6985 err = hot_add_disk(mddev, new_decode_dev(arg));
6989 err = do_md_run(mddev);
6992 case SET_BITMAP_FILE:
6993 err = set_bitmap_file(mddev, (int)arg);
7002 if (mddev->hold_active == UNTIL_IOCTL &&
7004 mddev->hold_active = 0;
7005 mddev_unlock(mddev);
7009 #ifdef CONFIG_COMPAT
7010 static int md_compat_ioctl(struct block_device *bdev, fmode_t mode,
7011 unsigned int cmd, unsigned long arg)
7014 case HOT_REMOVE_DISK:
7016 case SET_DISK_FAULTY:
7017 case SET_BITMAP_FILE:
7018 /* These take in integer arg, do not convert */
7021 arg = (unsigned long)compat_ptr(arg);
7025 return md_ioctl(bdev, mode, cmd, arg);
7027 #endif /* CONFIG_COMPAT */
7029 static int md_open(struct block_device *bdev, fmode_t mode)
7032 * Succeed if we can lock the mddev, which confirms that
7033 * it isn't being stopped right now.
7035 struct mddev *mddev = mddev_find(bdev->bd_dev);
7041 if (mddev->gendisk != bdev->bd_disk) {
7042 /* we are racing with mddev_put which is discarding this
7046 /* Wait until bdev->bd_disk is definitely gone */
7047 if (work_pending(&mddev->del_work))
7048 flush_workqueue(md_misc_wq);
7051 BUG_ON(mddev != bdev->bd_disk->private_data);
7053 if ((err = mutex_lock_interruptible(&mddev->open_mutex)))
7057 atomic_inc(&mddev->openers);
7058 clear_bit(MD_STILL_CLOSED, &mddev->flags);
7059 mutex_unlock(&mddev->open_mutex);
7061 check_disk_change(bdev);
7066 static void md_release(struct gendisk *disk, fmode_t mode)
7068 struct mddev *mddev = disk->private_data;
7071 atomic_dec(&mddev->openers);
7075 static int md_media_changed(struct gendisk *disk)
7077 struct mddev *mddev = disk->private_data;
7079 return mddev->changed;
7082 static int md_revalidate(struct gendisk *disk)
7084 struct mddev *mddev = disk->private_data;
7089 static const struct block_device_operations md_fops =
7091 .owner = THIS_MODULE,
7093 .release = md_release,
7095 #ifdef CONFIG_COMPAT
7096 .compat_ioctl = md_compat_ioctl,
7098 .getgeo = md_getgeo,
7099 .media_changed = md_media_changed,
7100 .revalidate_disk= md_revalidate,
7103 static int md_thread(void *arg)
7105 struct md_thread *thread = arg;
7108 * md_thread is a 'system-thread', it's priority should be very
7109 * high. We avoid resource deadlocks individually in each
7110 * raid personality. (RAID5 does preallocation) We also use RR and
7111 * the very same RT priority as kswapd, thus we will never get
7112 * into a priority inversion deadlock.
7114 * we definitely have to have equal or higher priority than
7115 * bdflush, otherwise bdflush will deadlock if there are too
7116 * many dirty RAID5 blocks.
7119 allow_signal(SIGKILL);
7120 while (!kthread_should_stop()) {
7122 /* We need to wait INTERRUPTIBLE so that
7123 * we don't add to the load-average.
7124 * That means we need to be sure no signals are
7127 if (signal_pending(current))
7128 flush_signals(current);
7130 wait_event_interruptible_timeout
7132 test_bit(THREAD_WAKEUP, &thread->flags)
7133 || kthread_should_stop(),
7136 clear_bit(THREAD_WAKEUP, &thread->flags);
7137 if (!kthread_should_stop())
7138 thread->run(thread);
7144 void md_wakeup_thread(struct md_thread *thread)
7147 pr_debug("md: waking up MD thread %s.\n", thread->tsk->comm);
7148 set_bit(THREAD_WAKEUP, &thread->flags);
7149 wake_up(&thread->wqueue);
7152 EXPORT_SYMBOL(md_wakeup_thread);
7154 struct md_thread *md_register_thread(void (*run) (struct md_thread *),
7155 struct mddev *mddev, const char *name)
7157 struct md_thread *thread;
7159 thread = kzalloc(sizeof(struct md_thread), GFP_KERNEL);
7163 init_waitqueue_head(&thread->wqueue);
7166 thread->mddev = mddev;
7167 thread->timeout = MAX_SCHEDULE_TIMEOUT;
7168 thread->tsk = kthread_run(md_thread, thread,
7170 mdname(thread->mddev),
7172 if (IS_ERR(thread->tsk)) {
7178 EXPORT_SYMBOL(md_register_thread);
7180 void md_unregister_thread(struct md_thread **threadp)
7182 struct md_thread *thread = *threadp;
7185 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
7186 /* Locking ensures that mddev_unlock does not wake_up a
7187 * non-existent thread
7189 spin_lock(&pers_lock);
7191 spin_unlock(&pers_lock);
7193 kthread_stop(thread->tsk);
7196 EXPORT_SYMBOL(md_unregister_thread);
7198 void md_error(struct mddev *mddev, struct md_rdev *rdev)
7200 if (!rdev || test_bit(Faulty, &rdev->flags))
7203 if (!mddev->pers || !mddev->pers->error_handler)
7205 mddev->pers->error_handler(mddev,rdev);
7206 if (mddev->degraded)
7207 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7208 sysfs_notify_dirent_safe(rdev->sysfs_state);
7209 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7210 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7211 md_wakeup_thread(mddev->thread);
7212 if (mddev->event_work.func)
7213 queue_work(md_misc_wq, &mddev->event_work);
7214 md_new_event_inintr(mddev);
7216 EXPORT_SYMBOL(md_error);
7218 /* seq_file implementation /proc/mdstat */
7220 static void status_unused(struct seq_file *seq)
7223 struct md_rdev *rdev;
7225 seq_printf(seq, "unused devices: ");
7227 list_for_each_entry(rdev, &pending_raid_disks, same_set) {
7228 char b[BDEVNAME_SIZE];
7230 seq_printf(seq, "%s ",
7231 bdevname(rdev->bdev,b));
7234 seq_printf(seq, "<none>");
7236 seq_printf(seq, "\n");
7239 static int status_resync(struct seq_file *seq, struct mddev *mddev)
7241 sector_t max_sectors, resync, res;
7242 unsigned long dt, db = 0;
7243 sector_t rt, curr_mark_cnt, resync_mark_cnt;
7244 int scale, recovery_active;
7245 unsigned int per_milli;
7247 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
7248 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
7249 max_sectors = mddev->resync_max_sectors;
7251 max_sectors = mddev->dev_sectors;
7253 resync = mddev->curr_resync;
7255 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
7256 /* Still cleaning up */
7257 resync = max_sectors;
7259 resync -= atomic_read(&mddev->recovery_active);
7262 if (mddev->recovery_cp < MaxSector) {
7263 seq_printf(seq, "\tresync=PENDING");
7269 seq_printf(seq, "\tresync=DELAYED");
7273 WARN_ON(max_sectors == 0);
7274 /* Pick 'scale' such that (resync>>scale)*1000 will fit
7275 * in a sector_t, and (max_sectors>>scale) will fit in a
7276 * u32, as those are the requirements for sector_div.
7277 * Thus 'scale' must be at least 10
7280 if (sizeof(sector_t) > sizeof(unsigned long)) {
7281 while ( max_sectors/2 > (1ULL<<(scale+32)))
7284 res = (resync>>scale)*1000;
7285 sector_div(res, (u32)((max_sectors>>scale)+1));
7289 int i, x = per_milli/50, y = 20-x;
7290 seq_printf(seq, "[");
7291 for (i = 0; i < x; i++)
7292 seq_printf(seq, "=");
7293 seq_printf(seq, ">");
7294 for (i = 0; i < y; i++)
7295 seq_printf(seq, ".");
7296 seq_printf(seq, "] ");
7298 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
7299 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
7301 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
7303 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
7304 "resync" : "recovery"))),
7305 per_milli/10, per_milli % 10,
7306 (unsigned long long) resync/2,
7307 (unsigned long long) max_sectors/2);
7310 * dt: time from mark until now
7311 * db: blocks written from mark until now
7312 * rt: remaining time
7314 * rt is a sector_t, which is always 64bit now. We are keeping
7315 * the original algorithm, but it is not really necessary.
7317 * Original algorithm:
7318 * So we divide before multiply in case it is 32bit and close
7320 * We scale the divisor (db) by 32 to avoid losing precision
7321 * near the end of resync when the number of remaining sectors
7323 * We then divide rt by 32 after multiplying by db to compensate.
7324 * The '+1' avoids division by zero if db is very small.
7326 dt = ((jiffies - mddev->resync_mark) / HZ);
7329 curr_mark_cnt = mddev->curr_mark_cnt;
7330 recovery_active = atomic_read(&mddev->recovery_active);
7331 resync_mark_cnt = mddev->resync_mark_cnt;
7333 if (curr_mark_cnt >= (recovery_active + resync_mark_cnt))
7334 db = curr_mark_cnt - (recovery_active + resync_mark_cnt);
7336 rt = max_sectors - resync; /* number of remaining sectors */
7337 rt = div64_u64(rt, db/32+1);
7341 seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60,
7342 ((unsigned long)rt % 60)/6);
7344 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
7348 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
7350 struct list_head *tmp;
7352 struct mddev *mddev;
7360 spin_lock(&all_mddevs_lock);
7361 list_for_each(tmp,&all_mddevs)
7363 mddev = list_entry(tmp, struct mddev, all_mddevs);
7365 spin_unlock(&all_mddevs_lock);
7368 spin_unlock(&all_mddevs_lock);
7370 return (void*)2;/* tail */
7374 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
7376 struct list_head *tmp;
7377 struct mddev *next_mddev, *mddev = v;
7383 spin_lock(&all_mddevs_lock);
7385 tmp = all_mddevs.next;
7387 tmp = mddev->all_mddevs.next;
7388 if (tmp != &all_mddevs)
7389 next_mddev = mddev_get(list_entry(tmp,struct mddev,all_mddevs));
7391 next_mddev = (void*)2;
7394 spin_unlock(&all_mddevs_lock);
7402 static void md_seq_stop(struct seq_file *seq, void *v)
7404 struct mddev *mddev = v;
7406 if (mddev && v != (void*)1 && v != (void*)2)
7410 static int md_seq_show(struct seq_file *seq, void *v)
7412 struct mddev *mddev = v;
7414 struct md_rdev *rdev;
7416 if (v == (void*)1) {
7417 struct md_personality *pers;
7418 seq_printf(seq, "Personalities : ");
7419 spin_lock(&pers_lock);
7420 list_for_each_entry(pers, &pers_list, list)
7421 seq_printf(seq, "[%s] ", pers->name);
7423 spin_unlock(&pers_lock);
7424 seq_printf(seq, "\n");
7425 seq->poll_event = atomic_read(&md_event_count);
7428 if (v == (void*)2) {
7433 spin_lock(&mddev->lock);
7434 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
7435 seq_printf(seq, "%s : %sactive", mdname(mddev),
7436 mddev->pers ? "" : "in");
7439 seq_printf(seq, " (read-only)");
7441 seq_printf(seq, " (auto-read-only)");
7442 seq_printf(seq, " %s", mddev->pers->name);
7447 rdev_for_each_rcu(rdev, mddev) {
7448 char b[BDEVNAME_SIZE];
7449 seq_printf(seq, " %s[%d]",
7450 bdevname(rdev->bdev,b), rdev->desc_nr);
7451 if (test_bit(WriteMostly, &rdev->flags))
7452 seq_printf(seq, "(W)");
7453 if (test_bit(Journal, &rdev->flags))
7454 seq_printf(seq, "(J)");
7455 if (test_bit(Faulty, &rdev->flags)) {
7456 seq_printf(seq, "(F)");
7459 if (rdev->raid_disk < 0)
7460 seq_printf(seq, "(S)"); /* spare */
7461 if (test_bit(Replacement, &rdev->flags))
7462 seq_printf(seq, "(R)");
7463 sectors += rdev->sectors;
7467 if (!list_empty(&mddev->disks)) {
7469 seq_printf(seq, "\n %llu blocks",
7470 (unsigned long long)
7471 mddev->array_sectors / 2);
7473 seq_printf(seq, "\n %llu blocks",
7474 (unsigned long long)sectors / 2);
7476 if (mddev->persistent) {
7477 if (mddev->major_version != 0 ||
7478 mddev->minor_version != 90) {
7479 seq_printf(seq," super %d.%d",
7480 mddev->major_version,
7481 mddev->minor_version);
7483 } else if (mddev->external)
7484 seq_printf(seq, " super external:%s",
7485 mddev->metadata_type);
7487 seq_printf(seq, " super non-persistent");
7490 mddev->pers->status(seq, mddev);
7491 seq_printf(seq, "\n ");
7492 if (mddev->pers->sync_request) {
7493 if (status_resync(seq, mddev))
7494 seq_printf(seq, "\n ");
7497 seq_printf(seq, "\n ");
7499 bitmap_status(seq, mddev->bitmap);
7501 seq_printf(seq, "\n");
7503 spin_unlock(&mddev->lock);
7508 static const struct seq_operations md_seq_ops = {
7509 .start = md_seq_start,
7510 .next = md_seq_next,
7511 .stop = md_seq_stop,
7512 .show = md_seq_show,
7515 static int md_seq_open(struct inode *inode, struct file *file)
7517 struct seq_file *seq;
7520 error = seq_open(file, &md_seq_ops);
7524 seq = file->private_data;
7525 seq->poll_event = atomic_read(&md_event_count);
7529 static int md_unloading;
7530 static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
7532 struct seq_file *seq = filp->private_data;
7536 return POLLIN|POLLRDNORM|POLLERR|POLLPRI;
7537 poll_wait(filp, &md_event_waiters, wait);
7539 /* always allow read */
7540 mask = POLLIN | POLLRDNORM;
7542 if (seq->poll_event != atomic_read(&md_event_count))
7543 mask |= POLLERR | POLLPRI;
7547 static const struct file_operations md_seq_fops = {
7548 .owner = THIS_MODULE,
7549 .open = md_seq_open,
7551 .llseek = seq_lseek,
7552 .release = seq_release_private,
7553 .poll = mdstat_poll,
7556 int register_md_personality(struct md_personality *p)
7558 printk(KERN_INFO "md: %s personality registered for level %d\n",
7560 spin_lock(&pers_lock);
7561 list_add_tail(&p->list, &pers_list);
7562 spin_unlock(&pers_lock);
7565 EXPORT_SYMBOL(register_md_personality);
7567 int unregister_md_personality(struct md_personality *p)
7569 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
7570 spin_lock(&pers_lock);
7571 list_del_init(&p->list);
7572 spin_unlock(&pers_lock);
7575 EXPORT_SYMBOL(unregister_md_personality);
7577 int register_md_cluster_operations(struct md_cluster_operations *ops,
7578 struct module *module)
7581 spin_lock(&pers_lock);
7582 if (md_cluster_ops != NULL)
7585 md_cluster_ops = ops;
7586 md_cluster_mod = module;
7588 spin_unlock(&pers_lock);
7591 EXPORT_SYMBOL(register_md_cluster_operations);
7593 int unregister_md_cluster_operations(void)
7595 spin_lock(&pers_lock);
7596 md_cluster_ops = NULL;
7597 spin_unlock(&pers_lock);
7600 EXPORT_SYMBOL(unregister_md_cluster_operations);
7602 int md_setup_cluster(struct mddev *mddev, int nodes)
7604 if (!md_cluster_ops)
7605 request_module("md-cluster");
7606 spin_lock(&pers_lock);
7607 /* ensure module won't be unloaded */
7608 if (!md_cluster_ops || !try_module_get(md_cluster_mod)) {
7609 pr_err("can't find md-cluster module or get it's reference.\n");
7610 spin_unlock(&pers_lock);
7613 spin_unlock(&pers_lock);
7615 return md_cluster_ops->join(mddev, nodes);
7618 void md_cluster_stop(struct mddev *mddev)
7620 if (!md_cluster_ops)
7622 md_cluster_ops->leave(mddev);
7623 module_put(md_cluster_mod);
7626 static int is_mddev_idle(struct mddev *mddev, int init)
7628 struct md_rdev *rdev;
7634 rdev_for_each_rcu(rdev, mddev) {
7635 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
7636 curr_events = (int)part_stat_read(&disk->part0, sectors[0]) +
7637 (int)part_stat_read(&disk->part0, sectors[1]) -
7638 atomic_read(&disk->sync_io);
7639 /* sync IO will cause sync_io to increase before the disk_stats
7640 * as sync_io is counted when a request starts, and
7641 * disk_stats is counted when it completes.
7642 * So resync activity will cause curr_events to be smaller than
7643 * when there was no such activity.
7644 * non-sync IO will cause disk_stat to increase without
7645 * increasing sync_io so curr_events will (eventually)
7646 * be larger than it was before. Once it becomes
7647 * substantially larger, the test below will cause
7648 * the array to appear non-idle, and resync will slow
7650 * If there is a lot of outstanding resync activity when
7651 * we set last_event to curr_events, then all that activity
7652 * completing might cause the array to appear non-idle
7653 * and resync will be slowed down even though there might
7654 * not have been non-resync activity. This will only
7655 * happen once though. 'last_events' will soon reflect
7656 * the state where there is little or no outstanding
7657 * resync requests, and further resync activity will
7658 * always make curr_events less than last_events.
7661 if (init || curr_events - rdev->last_events > 64) {
7662 rdev->last_events = curr_events;
7670 void md_done_sync(struct mddev *mddev, int blocks, int ok)
7672 /* another "blocks" (512byte) blocks have been synced */
7673 atomic_sub(blocks, &mddev->recovery_active);
7674 wake_up(&mddev->recovery_wait);
7676 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7677 set_bit(MD_RECOVERY_ERROR, &mddev->recovery);
7678 md_wakeup_thread(mddev->thread);
7679 // stop recovery, signal do_sync ....
7682 EXPORT_SYMBOL(md_done_sync);
7684 /* md_write_start(mddev, bi)
7685 * If we need to update some array metadata (e.g. 'active' flag
7686 * in superblock) before writing, schedule a superblock update
7687 * and wait for it to complete.
7689 void md_write_start(struct mddev *mddev, struct bio *bi)
7692 if (bio_data_dir(bi) != WRITE)
7695 BUG_ON(mddev->ro == 1);
7696 if (mddev->ro == 2) {
7697 /* need to switch to read/write */
7699 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7700 md_wakeup_thread(mddev->thread);
7701 md_wakeup_thread(mddev->sync_thread);
7704 atomic_inc(&mddev->writes_pending);
7705 if (mddev->safemode == 1)
7706 mddev->safemode = 0;
7707 if (mddev->in_sync) {
7708 spin_lock(&mddev->lock);
7709 if (mddev->in_sync) {
7711 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
7712 set_bit(MD_CHANGE_PENDING, &mddev->flags);
7713 md_wakeup_thread(mddev->thread);
7716 spin_unlock(&mddev->lock);
7719 sysfs_notify_dirent_safe(mddev->sysfs_state);
7720 wait_event(mddev->sb_wait,
7721 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
7723 EXPORT_SYMBOL(md_write_start);
7725 void md_write_end(struct mddev *mddev)
7727 if (atomic_dec_and_test(&mddev->writes_pending)) {
7728 if (mddev->safemode == 2)
7729 md_wakeup_thread(mddev->thread);
7730 else if (mddev->safemode_delay)
7731 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
7734 EXPORT_SYMBOL(md_write_end);
7736 /* md_allow_write(mddev)
7737 * Calling this ensures that the array is marked 'active' so that writes
7738 * may proceed without blocking. It is important to call this before
7739 * attempting a GFP_KERNEL allocation while holding the mddev lock.
7740 * Must be called with mddev_lock held.
7742 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
7743 * is dropped, so return -EAGAIN after notifying userspace.
7745 int md_allow_write(struct mddev *mddev)
7751 if (!mddev->pers->sync_request)
7754 spin_lock(&mddev->lock);
7755 if (mddev->in_sync) {
7757 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
7758 set_bit(MD_CHANGE_PENDING, &mddev->flags);
7759 if (mddev->safemode_delay &&
7760 mddev->safemode == 0)
7761 mddev->safemode = 1;
7762 spin_unlock(&mddev->lock);
7763 md_update_sb(mddev, 0);
7764 sysfs_notify_dirent_safe(mddev->sysfs_state);
7766 spin_unlock(&mddev->lock);
7768 if (test_bit(MD_CHANGE_PENDING, &mddev->flags))
7773 EXPORT_SYMBOL_GPL(md_allow_write);
7775 #define SYNC_MARKS 10
7776 #define SYNC_MARK_STEP (3*HZ)
7777 #define UPDATE_FREQUENCY (5*60*HZ)
7778 void md_do_sync(struct md_thread *thread)
7780 struct mddev *mddev = thread->mddev;
7781 struct mddev *mddev2;
7782 unsigned int currspeed = 0,
7784 sector_t max_sectors,j, io_sectors, recovery_done;
7785 unsigned long mark[SYNC_MARKS];
7786 unsigned long update_time;
7787 sector_t mark_cnt[SYNC_MARKS];
7789 struct list_head *tmp;
7790 sector_t last_check;
7792 struct md_rdev *rdev;
7793 char *desc, *action = NULL;
7794 struct blk_plug plug;
7795 bool cluster_resync_finished = false;
7797 /* just incase thread restarts... */
7798 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
7800 if (mddev->ro) {/* never try to sync a read-only array */
7801 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7805 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
7806 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) {
7807 desc = "data-check";
7809 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
7810 desc = "requested-resync";
7814 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
7819 mddev->last_sync_action = action ?: desc;
7821 /* we overload curr_resync somewhat here.
7822 * 0 == not engaged in resync at all
7823 * 2 == checking that there is no conflict with another sync
7824 * 1 == like 2, but have yielded to allow conflicting resync to
7826 * other == active in resync - this many blocks
7828 * Before starting a resync we must have set curr_resync to
7829 * 2, and then checked that every "conflicting" array has curr_resync
7830 * less than ours. When we find one that is the same or higher
7831 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
7832 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
7833 * This will mean we have to start checking from the beginning again.
7838 mddev->curr_resync = 2;
7841 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
7843 for_each_mddev(mddev2, tmp) {
7844 if (mddev2 == mddev)
7846 if (!mddev->parallel_resync
7847 && mddev2->curr_resync
7848 && match_mddev_units(mddev, mddev2)) {
7850 if (mddev < mddev2 && mddev->curr_resync == 2) {
7851 /* arbitrarily yield */
7852 mddev->curr_resync = 1;
7853 wake_up(&resync_wait);
7855 if (mddev > mddev2 && mddev->curr_resync == 1)
7856 /* no need to wait here, we can wait the next
7857 * time 'round when curr_resync == 2
7860 /* We need to wait 'interruptible' so as not to
7861 * contribute to the load average, and not to
7862 * be caught by 'softlockup'
7864 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
7865 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
7866 mddev2->curr_resync >= mddev->curr_resync) {
7867 printk(KERN_INFO "md: delaying %s of %s"
7868 " until %s has finished (they"
7869 " share one or more physical units)\n",
7870 desc, mdname(mddev), mdname(mddev2));
7872 if (signal_pending(current))
7873 flush_signals(current);
7875 finish_wait(&resync_wait, &wq);
7878 finish_wait(&resync_wait, &wq);
7881 } while (mddev->curr_resync < 2);
7884 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
7885 /* resync follows the size requested by the personality,
7886 * which defaults to physical size, but can be virtual size
7888 max_sectors = mddev->resync_max_sectors;
7889 atomic64_set(&mddev->resync_mismatches, 0);
7890 /* we don't use the checkpoint if there's a bitmap */
7891 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
7892 j = mddev->resync_min;
7893 else if (!mddev->bitmap)
7894 j = mddev->recovery_cp;
7896 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
7897 max_sectors = mddev->resync_max_sectors;
7899 /* recovery follows the physical size of devices */
7900 max_sectors = mddev->dev_sectors;
7903 rdev_for_each_rcu(rdev, mddev)
7904 if (rdev->raid_disk >= 0 &&
7905 !test_bit(Journal, &rdev->flags) &&
7906 !test_bit(Faulty, &rdev->flags) &&
7907 !test_bit(In_sync, &rdev->flags) &&
7908 rdev->recovery_offset < j)
7909 j = rdev->recovery_offset;
7912 /* If there is a bitmap, we need to make sure all
7913 * writes that started before we added a spare
7914 * complete before we start doing a recovery.
7915 * Otherwise the write might complete and (via
7916 * bitmap_endwrite) set a bit in the bitmap after the
7917 * recovery has checked that bit and skipped that
7920 if (mddev->bitmap) {
7921 mddev->pers->quiesce(mddev, 1);
7922 mddev->pers->quiesce(mddev, 0);
7926 printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev));
7927 printk(KERN_INFO "md: minimum _guaranteed_ speed:"
7928 " %d KB/sec/disk.\n", speed_min(mddev));
7929 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
7930 "(but not more than %d KB/sec) for %s.\n",
7931 speed_max(mddev), desc);
7933 is_mddev_idle(mddev, 1); /* this initializes IO event counters */
7936 for (m = 0; m < SYNC_MARKS; m++) {
7938 mark_cnt[m] = io_sectors;
7941 mddev->resync_mark = mark[last_mark];
7942 mddev->resync_mark_cnt = mark_cnt[last_mark];
7945 * Tune reconstruction:
7947 window = 32*(PAGE_SIZE/512);
7948 printk(KERN_INFO "md: using %dk window, over a total of %lluk.\n",
7949 window/2, (unsigned long long)max_sectors/2);
7951 atomic_set(&mddev->recovery_active, 0);
7956 "md: resuming %s of %s from checkpoint.\n",
7957 desc, mdname(mddev));
7958 mddev->curr_resync = j;
7960 mddev->curr_resync = 3; /* no longer delayed */
7961 mddev->curr_resync_completed = j;
7962 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
7963 md_new_event(mddev);
7964 update_time = jiffies;
7966 blk_start_plug(&plug);
7967 while (j < max_sectors) {
7972 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
7973 ((mddev->curr_resync > mddev->curr_resync_completed &&
7974 (mddev->curr_resync - mddev->curr_resync_completed)
7975 > (max_sectors >> 4)) ||
7976 time_after_eq(jiffies, update_time + UPDATE_FREQUENCY) ||
7977 (j - mddev->curr_resync_completed)*2
7978 >= mddev->resync_max - mddev->curr_resync_completed ||
7979 mddev->curr_resync_completed > mddev->resync_max
7981 /* time to update curr_resync_completed */
7982 wait_event(mddev->recovery_wait,
7983 atomic_read(&mddev->recovery_active) == 0);
7984 mddev->curr_resync_completed = j;
7985 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) &&
7986 j > mddev->recovery_cp)
7987 mddev->recovery_cp = j;
7988 update_time = jiffies;
7989 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
7990 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
7993 while (j >= mddev->resync_max &&
7994 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
7995 /* As this condition is controlled by user-space,
7996 * we can block indefinitely, so use '_interruptible'
7997 * to avoid triggering warnings.
7999 flush_signals(current); /* just in case */
8000 wait_event_interruptible(mddev->recovery_wait,
8001 mddev->resync_max > j
8002 || test_bit(MD_RECOVERY_INTR,
8006 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8009 sectors = mddev->pers->sync_request(mddev, j, &skipped);
8011 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8015 if (!skipped) { /* actual IO requested */
8016 io_sectors += sectors;
8017 atomic_add(sectors, &mddev->recovery_active);
8020 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8024 if (j > max_sectors)
8025 /* when skipping, extra large numbers can be returned. */
8028 mddev->curr_resync = j;
8029 mddev->curr_mark_cnt = io_sectors;
8030 if (last_check == 0)
8031 /* this is the earliest that rebuild will be
8032 * visible in /proc/mdstat
8034 md_new_event(mddev);
8036 if (last_check + window > io_sectors || j == max_sectors)
8039 last_check = io_sectors;
8041 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
8043 int next = (last_mark+1) % SYNC_MARKS;
8045 mddev->resync_mark = mark[next];
8046 mddev->resync_mark_cnt = mark_cnt[next];
8047 mark[next] = jiffies;
8048 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
8052 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8056 * this loop exits only if either when we are slower than
8057 * the 'hard' speed limit, or the system was IO-idle for
8059 * the system might be non-idle CPU-wise, but we only care
8060 * about not overloading the IO subsystem. (things like an
8061 * e2fsck being done on the RAID array should execute fast)
8065 recovery_done = io_sectors - atomic_read(&mddev->recovery_active);
8066 currspeed = ((unsigned long)(recovery_done - mddev->resync_mark_cnt))/2
8067 /((jiffies-mddev->resync_mark)/HZ +1) +1;
8069 if (currspeed > speed_min(mddev)) {
8070 if (currspeed > speed_max(mddev)) {
8074 if (!is_mddev_idle(mddev, 0)) {
8076 * Give other IO more of a chance.
8077 * The faster the devices, the less we wait.
8079 wait_event(mddev->recovery_wait,
8080 !atomic_read(&mddev->recovery_active));
8084 printk(KERN_INFO "md: %s: %s %s.\n",mdname(mddev), desc,
8085 test_bit(MD_RECOVERY_INTR, &mddev->recovery)
8086 ? "interrupted" : "done");
8088 * this also signals 'finished resyncing' to md_stop
8090 blk_finish_plug(&plug);
8091 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
8093 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8094 !test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8095 mddev->curr_resync > 2) {
8096 mddev->curr_resync_completed = mddev->curr_resync;
8097 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
8099 /* tell personality and other nodes that we are finished */
8100 if (mddev_is_clustered(mddev)) {
8101 md_cluster_ops->resync_finish(mddev);
8102 cluster_resync_finished = true;
8104 mddev->pers->sync_request(mddev, max_sectors, &skipped);
8106 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
8107 mddev->curr_resync > 2) {
8108 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
8109 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
8110 if (mddev->curr_resync >= mddev->recovery_cp) {
8112 "md: checkpointing %s of %s.\n",
8113 desc, mdname(mddev));
8114 if (test_bit(MD_RECOVERY_ERROR,
8116 mddev->recovery_cp =
8117 mddev->curr_resync_completed;
8119 mddev->recovery_cp =
8123 mddev->recovery_cp = MaxSector;
8125 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8126 mddev->curr_resync = MaxSector;
8128 rdev_for_each_rcu(rdev, mddev)
8129 if (rdev->raid_disk >= 0 &&
8130 mddev->delta_disks >= 0 &&
8131 !test_bit(Journal, &rdev->flags) &&
8132 !test_bit(Faulty, &rdev->flags) &&
8133 !test_bit(In_sync, &rdev->flags) &&
8134 rdev->recovery_offset < mddev->curr_resync)
8135 rdev->recovery_offset = mddev->curr_resync;
8140 set_bit(MD_CHANGE_DEVS, &mddev->flags);
8142 if (mddev_is_clustered(mddev) &&
8143 test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8144 !cluster_resync_finished)
8145 md_cluster_ops->resync_finish(mddev);
8147 spin_lock(&mddev->lock);
8148 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
8149 /* We completed so min/max setting can be forgotten if used. */
8150 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
8151 mddev->resync_min = 0;
8152 mddev->resync_max = MaxSector;
8153 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
8154 mddev->resync_min = mddev->curr_resync_completed;
8155 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
8156 mddev->curr_resync = 0;
8157 spin_unlock(&mddev->lock);
8159 wake_up(&resync_wait);
8160 md_wakeup_thread(mddev->thread);
8163 EXPORT_SYMBOL_GPL(md_do_sync);
8165 static int remove_and_add_spares(struct mddev *mddev,
8166 struct md_rdev *this)
8168 struct md_rdev *rdev;
8172 rdev_for_each(rdev, mddev)
8173 if ((this == NULL || rdev == this) &&
8174 rdev->raid_disk >= 0 &&
8175 !test_bit(Blocked, &rdev->flags) &&
8176 (test_bit(Faulty, &rdev->flags) ||
8177 (!test_bit(In_sync, &rdev->flags) &&
8178 !test_bit(Journal, &rdev->flags))) &&
8179 atomic_read(&rdev->nr_pending)==0) {
8180 if (mddev->pers->hot_remove_disk(
8181 mddev, rdev) == 0) {
8182 sysfs_unlink_rdev(mddev, rdev);
8183 rdev->saved_raid_disk = rdev->raid_disk;
8184 rdev->raid_disk = -1;
8188 if (removed && mddev->kobj.sd)
8189 sysfs_notify(&mddev->kobj, NULL, "degraded");
8191 if (this && removed)
8194 rdev_for_each(rdev, mddev) {
8195 if (this && this != rdev)
8197 if (test_bit(Candidate, &rdev->flags))
8199 if (rdev->raid_disk >= 0 &&
8200 !test_bit(In_sync, &rdev->flags) &&
8201 !test_bit(Journal, &rdev->flags) &&
8202 !test_bit(Faulty, &rdev->flags))
8204 if (rdev->raid_disk >= 0)
8206 if (test_bit(Faulty, &rdev->flags))
8208 if (test_bit(Journal, &rdev->flags))
8211 ! (rdev->saved_raid_disk >= 0 &&
8212 !test_bit(Bitmap_sync, &rdev->flags)))
8215 rdev->recovery_offset = 0;
8217 hot_add_disk(mddev, rdev) == 0) {
8218 if (sysfs_link_rdev(mddev, rdev))
8219 /* failure here is OK */;
8221 md_new_event(mddev);
8222 set_bit(MD_CHANGE_DEVS, &mddev->flags);
8227 set_bit(MD_CHANGE_DEVS, &mddev->flags);
8231 static void md_start_sync(struct work_struct *ws)
8233 struct mddev *mddev = container_of(ws, struct mddev, del_work);
8236 if (mddev_is_clustered(mddev)) {
8237 ret = md_cluster_ops->resync_start(mddev);
8239 mddev->sync_thread = NULL;
8244 mddev->sync_thread = md_register_thread(md_do_sync,
8248 if (!mddev->sync_thread) {
8249 if (!(mddev_is_clustered(mddev) && ret == -EAGAIN))
8250 printk(KERN_ERR "%s: could not start resync"
8253 /* leave the spares where they are, it shouldn't hurt */
8254 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8255 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
8256 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
8257 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
8258 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
8259 wake_up(&resync_wait);
8260 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
8262 if (mddev->sysfs_action)
8263 sysfs_notify_dirent_safe(mddev->sysfs_action);
8265 md_wakeup_thread(mddev->sync_thread);
8266 sysfs_notify_dirent_safe(mddev->sysfs_action);
8267 md_new_event(mddev);
8271 * This routine is regularly called by all per-raid-array threads to
8272 * deal with generic issues like resync and super-block update.
8273 * Raid personalities that don't have a thread (linear/raid0) do not
8274 * need this as they never do any recovery or update the superblock.
8276 * It does not do any resync itself, but rather "forks" off other threads
8277 * to do that as needed.
8278 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
8279 * "->recovery" and create a thread at ->sync_thread.
8280 * When the thread finishes it sets MD_RECOVERY_DONE
8281 * and wakeups up this thread which will reap the thread and finish up.
8282 * This thread also removes any faulty devices (with nr_pending == 0).
8284 * The overall approach is:
8285 * 1/ if the superblock needs updating, update it.
8286 * 2/ If a recovery thread is running, don't do anything else.
8287 * 3/ If recovery has finished, clean up, possibly marking spares active.
8288 * 4/ If there are any faulty devices, remove them.
8289 * 5/ If array is degraded, try to add spares devices
8290 * 6/ If array has spares or is not in-sync, start a resync thread.
8292 void md_check_recovery(struct mddev *mddev)
8294 if (mddev->suspended)
8298 bitmap_daemon_work(mddev);
8300 if (signal_pending(current)) {
8301 if (mddev->pers->sync_request && !mddev->external) {
8302 printk(KERN_INFO "md: %s in immediate safe mode\n",
8304 mddev->safemode = 2;
8306 flush_signals(current);
8309 if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
8312 (mddev->flags & MD_UPDATE_SB_FLAGS & ~ (1<<MD_CHANGE_PENDING)) ||
8313 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
8314 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
8315 (mddev->external == 0 && mddev->safemode == 1) ||
8316 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
8317 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
8321 if (mddev_trylock(mddev)) {
8325 struct md_rdev *rdev;
8326 if (!mddev->external && mddev->in_sync)
8327 /* 'Blocked' flag not needed as failed devices
8328 * will be recorded if array switched to read/write.
8329 * Leaving it set will prevent the device
8330 * from being removed.
8332 rdev_for_each(rdev, mddev)
8333 clear_bit(Blocked, &rdev->flags);
8334 /* On a read-only array we can:
8335 * - remove failed devices
8336 * - add already-in_sync devices if the array itself
8338 * As we only add devices that are already in-sync,
8339 * we can activate the spares immediately.
8341 remove_and_add_spares(mddev, NULL);
8342 /* There is no thread, but we need to call
8343 * ->spare_active and clear saved_raid_disk
8345 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8346 md_reap_sync_thread(mddev);
8347 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8348 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8349 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
8353 if (!mddev->external) {
8355 spin_lock(&mddev->lock);
8356 if (mddev->safemode &&
8357 !atomic_read(&mddev->writes_pending) &&
8359 mddev->recovery_cp == MaxSector) {
8362 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
8364 if (mddev->safemode == 1)
8365 mddev->safemode = 0;
8366 spin_unlock(&mddev->lock);
8368 sysfs_notify_dirent_safe(mddev->sysfs_state);
8371 if (mddev->flags & MD_UPDATE_SB_FLAGS)
8372 md_update_sb(mddev, 0);
8374 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
8375 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
8376 /* resync/recovery still happening */
8377 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8380 if (mddev->sync_thread) {
8381 md_reap_sync_thread(mddev);
8384 /* Set RUNNING before clearing NEEDED to avoid
8385 * any transients in the value of "sync_action".
8387 mddev->curr_resync_completed = 0;
8388 spin_lock(&mddev->lock);
8389 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
8390 spin_unlock(&mddev->lock);
8391 /* Clear some bits that don't mean anything, but
8394 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
8395 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
8397 if (!test_and_clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
8398 test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
8400 /* no recovery is running.
8401 * remove any failed drives, then
8402 * add spares if possible.
8403 * Spares are also removed and re-added, to allow
8404 * the personality to fail the re-add.
8407 if (mddev->reshape_position != MaxSector) {
8408 if (mddev->pers->check_reshape == NULL ||
8409 mddev->pers->check_reshape(mddev) != 0)
8410 /* Cannot proceed */
8412 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
8413 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8414 } else if ((spares = remove_and_add_spares(mddev, NULL))) {
8415 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8416 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
8417 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
8418 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8419 } else if (mddev->recovery_cp < MaxSector) {
8420 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8421 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8422 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
8423 /* nothing to be done ... */
8426 if (mddev->pers->sync_request) {
8428 /* We are adding a device or devices to an array
8429 * which has the bitmap stored on all devices.
8430 * So make sure all bitmap pages get written
8432 bitmap_write_all(mddev->bitmap);
8434 INIT_WORK(&mddev->del_work, md_start_sync);
8435 queue_work(md_misc_wq, &mddev->del_work);
8439 if (!mddev->sync_thread) {
8440 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
8441 wake_up(&resync_wait);
8442 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
8444 if (mddev->sysfs_action)
8445 sysfs_notify_dirent_safe(mddev->sysfs_action);
8448 wake_up(&mddev->sb_wait);
8449 mddev_unlock(mddev);
8452 EXPORT_SYMBOL(md_check_recovery);
8454 void md_reap_sync_thread(struct mddev *mddev)
8456 struct md_rdev *rdev;
8458 /* resync has finished, collect result */
8459 md_unregister_thread(&mddev->sync_thread);
8460 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8461 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) &&
8462 mddev->degraded != mddev->raid_disks) {
8464 /* activate any spares */
8465 if (mddev->pers->spare_active(mddev)) {
8466 sysfs_notify(&mddev->kobj, NULL,
8468 set_bit(MD_CHANGE_DEVS, &mddev->flags);
8471 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8472 mddev->pers->finish_reshape)
8473 mddev->pers->finish_reshape(mddev);
8475 /* If array is no-longer degraded, then any saved_raid_disk
8476 * information must be scrapped.
8478 if (!mddev->degraded)
8479 rdev_for_each(rdev, mddev)
8480 rdev->saved_raid_disk = -1;
8482 md_update_sb(mddev, 1);
8483 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
8484 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
8485 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8486 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
8487 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
8488 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
8489 wake_up(&resync_wait);
8490 /* flag recovery needed just to double check */
8491 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8492 sysfs_notify_dirent_safe(mddev->sysfs_action);
8493 md_new_event(mddev);
8494 if (mddev->event_work.func)
8495 queue_work(md_misc_wq, &mddev->event_work);
8497 EXPORT_SYMBOL(md_reap_sync_thread);
8499 void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev)
8501 sysfs_notify_dirent_safe(rdev->sysfs_state);
8502 wait_event_timeout(rdev->blocked_wait,
8503 !test_bit(Blocked, &rdev->flags) &&
8504 !test_bit(BlockedBadBlocks, &rdev->flags),
8505 msecs_to_jiffies(5000));
8506 rdev_dec_pending(rdev, mddev);
8508 EXPORT_SYMBOL(md_wait_for_blocked_rdev);
8510 void md_finish_reshape(struct mddev *mddev)
8512 /* called be personality module when reshape completes. */
8513 struct md_rdev *rdev;
8515 rdev_for_each(rdev, mddev) {
8516 if (rdev->data_offset > rdev->new_data_offset)
8517 rdev->sectors += rdev->data_offset - rdev->new_data_offset;
8519 rdev->sectors -= rdev->new_data_offset - rdev->data_offset;
8520 rdev->data_offset = rdev->new_data_offset;
8523 EXPORT_SYMBOL(md_finish_reshape);
8525 /* Bad block management.
8526 * We can record which blocks on each device are 'bad' and so just
8527 * fail those blocks, or that stripe, rather than the whole device.
8528 * Entries in the bad-block table are 64bits wide. This comprises:
8529 * Length of bad-range, in sectors: 0-511 for lengths 1-512
8530 * Start of bad-range, sector offset, 54 bits (allows 8 exbibytes)
8531 * A 'shift' can be set so that larger blocks are tracked and
8532 * consequently larger devices can be covered.
8533 * 'Acknowledged' flag - 1 bit. - the most significant bit.
8535 * Locking of the bad-block table uses a seqlock so md_is_badblock
8536 * might need to retry if it is very unlucky.
8537 * We will sometimes want to check for bad blocks in a bi_end_io function,
8538 * so we use the write_seqlock_irq variant.
8540 * When looking for a bad block we specify a range and want to
8541 * know if any block in the range is bad. So we binary-search
8542 * to the last range that starts at-or-before the given endpoint,
8543 * (or "before the sector after the target range")
8544 * then see if it ends after the given start.
8546 * 0 if there are no known bad blocks in the range
8547 * 1 if there are known bad block which are all acknowledged
8548 * -1 if there are bad blocks which have not yet been acknowledged in metadata.
8549 * plus the start/length of the first bad section we overlap.
8551 int md_is_badblock(struct badblocks *bb, sector_t s, int sectors,
8552 sector_t *first_bad, int *bad_sectors)
8558 sector_t target = s + sectors;
8561 if (bb->shift > 0) {
8562 /* round the start down, and the end up */
8564 target += (1<<bb->shift) - 1;
8565 target >>= bb->shift;
8566 sectors = target - s;
8568 /* 'target' is now the first block after the bad range */
8571 seq = read_seqbegin(&bb->lock);
8576 /* Binary search between lo and hi for 'target'
8577 * i.e. for the last range that starts before 'target'
8579 /* INVARIANT: ranges before 'lo' and at-or-after 'hi'
8580 * are known not to be the last range before target.
8581 * VARIANT: hi-lo is the number of possible
8582 * ranges, and decreases until it reaches 1
8584 while (hi - lo > 1) {
8585 int mid = (lo + hi) / 2;
8586 sector_t a = BB_OFFSET(p[mid]);
8588 /* This could still be the one, earlier ranges
8592 /* This and later ranges are definitely out. */
8595 /* 'lo' might be the last that started before target, but 'hi' isn't */
8597 /* need to check all range that end after 's' to see if
8598 * any are unacknowledged.
8601 BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) {
8602 if (BB_OFFSET(p[lo]) < target) {
8603 /* starts before the end, and finishes after
8604 * the start, so they must overlap
8606 if (rv != -1 && BB_ACK(p[lo]))
8610 *first_bad = BB_OFFSET(p[lo]);
8611 *bad_sectors = BB_LEN(p[lo]);
8617 if (read_seqretry(&bb->lock, seq))
8622 EXPORT_SYMBOL_GPL(md_is_badblock);
8625 * Add a range of bad blocks to the table.
8626 * This might extend the table, or might contract it
8627 * if two adjacent ranges can be merged.
8628 * We binary-search to find the 'insertion' point, then
8629 * decide how best to handle it.
8631 static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors,
8637 unsigned long flags;
8640 /* badblocks are disabled */
8644 /* round the start down, and the end up */
8645 sector_t next = s + sectors;
8647 next += (1<<bb->shift) - 1;
8652 write_seqlock_irqsave(&bb->lock, flags);
8657 /* Find the last range that starts at-or-before 's' */
8658 while (hi - lo > 1) {
8659 int mid = (lo + hi) / 2;
8660 sector_t a = BB_OFFSET(p[mid]);
8666 if (hi > lo && BB_OFFSET(p[lo]) > s)
8670 /* we found a range that might merge with the start
8673 sector_t a = BB_OFFSET(p[lo]);
8674 sector_t e = a + BB_LEN(p[lo]);
8675 int ack = BB_ACK(p[lo]);
8677 /* Yes, we can merge with a previous range */
8678 if (s == a && s + sectors >= e)
8679 /* new range covers old */
8682 ack = ack && acknowledged;
8684 if (e < s + sectors)
8686 if (e - a <= BB_MAX_LEN) {
8687 p[lo] = BB_MAKE(a, e-a, ack);
8690 /* does not all fit in one range,
8691 * make p[lo] maximal
8693 if (BB_LEN(p[lo]) != BB_MAX_LEN)
8694 p[lo] = BB_MAKE(a, BB_MAX_LEN, ack);
8700 if (sectors && hi < bb->count) {
8701 /* 'hi' points to the first range that starts after 's'.
8702 * Maybe we can merge with the start of that range */
8703 sector_t a = BB_OFFSET(p[hi]);
8704 sector_t e = a + BB_LEN(p[hi]);
8705 int ack = BB_ACK(p[hi]);
8706 if (a <= s + sectors) {
8707 /* merging is possible */
8708 if (e <= s + sectors) {
8713 ack = ack && acknowledged;
8716 if (e - a <= BB_MAX_LEN) {
8717 p[hi] = BB_MAKE(a, e-a, ack);
8720 p[hi] = BB_MAKE(a, BB_MAX_LEN, ack);
8728 if (sectors == 0 && hi < bb->count) {
8729 /* we might be able to combine lo and hi */
8730 /* Note: 's' is at the end of 'lo' */
8731 sector_t a = BB_OFFSET(p[hi]);
8732 int lolen = BB_LEN(p[lo]);
8733 int hilen = BB_LEN(p[hi]);
8734 int newlen = lolen + hilen - (s - a);
8735 if (s >= a && newlen < BB_MAX_LEN) {
8736 /* yes, we can combine them */
8737 int ack = BB_ACK(p[lo]) && BB_ACK(p[hi]);
8738 p[lo] = BB_MAKE(BB_OFFSET(p[lo]), newlen, ack);
8739 memmove(p + hi, p + hi + 1,
8740 (bb->count - hi - 1) * 8);
8745 /* didn't merge (it all).
8746 * Need to add a range just before 'hi' */
8747 if (bb->count >= MD_MAX_BADBLOCKS) {
8748 /* No room for more */
8752 int this_sectors = sectors;
8753 memmove(p + hi + 1, p + hi,
8754 (bb->count - hi) * 8);
8757 if (this_sectors > BB_MAX_LEN)
8758 this_sectors = BB_MAX_LEN;
8759 p[hi] = BB_MAKE(s, this_sectors, acknowledged);
8760 sectors -= this_sectors;
8767 bb->unacked_exist = 1;
8768 write_sequnlock_irqrestore(&bb->lock, flags);
8773 int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
8778 s += rdev->new_data_offset;
8780 s += rdev->data_offset;
8781 rv = md_set_badblocks(&rdev->badblocks,
8784 /* Make sure they get written out promptly */
8785 sysfs_notify_dirent_safe(rdev->sysfs_state);
8786 set_bit(MD_CHANGE_CLEAN, &rdev->mddev->flags);
8787 set_bit(MD_CHANGE_PENDING, &rdev->mddev->flags);
8788 md_wakeup_thread(rdev->mddev->thread);
8792 EXPORT_SYMBOL_GPL(rdev_set_badblocks);
8795 * Remove a range of bad blocks from the table.
8796 * This may involve extending the table if we spilt a region,
8797 * but it must not fail. So if the table becomes full, we just
8798 * drop the remove request.
8800 static int md_clear_badblocks(struct badblocks *bb, sector_t s, int sectors)
8804 sector_t target = s + sectors;
8807 if (bb->shift > 0) {
8808 /* When clearing we round the start up and the end down.
8809 * This should not matter as the shift should align with
8810 * the block size and no rounding should ever be needed.
8811 * However it is better the think a block is bad when it
8812 * isn't than to think a block is not bad when it is.
8814 s += (1<<bb->shift) - 1;
8816 target >>= bb->shift;
8817 sectors = target - s;
8820 write_seqlock_irq(&bb->lock);
8825 /* Find the last range that starts before 'target' */
8826 while (hi - lo > 1) {
8827 int mid = (lo + hi) / 2;
8828 sector_t a = BB_OFFSET(p[mid]);
8835 /* p[lo] is the last range that could overlap the
8836 * current range. Earlier ranges could also overlap,
8837 * but only this one can overlap the end of the range.
8839 if (BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > target) {
8840 /* Partial overlap, leave the tail of this range */
8841 int ack = BB_ACK(p[lo]);
8842 sector_t a = BB_OFFSET(p[lo]);
8843 sector_t end = a + BB_LEN(p[lo]);
8846 /* we need to split this range */
8847 if (bb->count >= MD_MAX_BADBLOCKS) {
8851 memmove(p+lo+1, p+lo, (bb->count - lo) * 8);
8853 p[lo] = BB_MAKE(a, s-a, ack);
8856 p[lo] = BB_MAKE(target, end - target, ack);
8857 /* there is no longer an overlap */
8862 BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) {
8863 /* This range does overlap */
8864 if (BB_OFFSET(p[lo]) < s) {
8865 /* Keep the early parts of this range. */
8866 int ack = BB_ACK(p[lo]);
8867 sector_t start = BB_OFFSET(p[lo]);
8868 p[lo] = BB_MAKE(start, s - start, ack);
8869 /* now low doesn't overlap, so.. */
8874 /* 'lo' is strictly before, 'hi' is strictly after,
8875 * anything between needs to be discarded
8878 memmove(p+lo+1, p+hi, (bb->count - hi) * 8);
8879 bb->count -= (hi - lo - 1);
8885 write_sequnlock_irq(&bb->lock);
8889 int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
8893 s += rdev->new_data_offset;
8895 s += rdev->data_offset;
8896 return md_clear_badblocks(&rdev->badblocks,
8899 EXPORT_SYMBOL_GPL(rdev_clear_badblocks);
8902 * Acknowledge all bad blocks in a list.
8903 * This only succeeds if ->changed is clear. It is used by
8904 * in-kernel metadata updates
8906 void md_ack_all_badblocks(struct badblocks *bb)
8908 if (bb->page == NULL || bb->changed)
8909 /* no point even trying */
8911 write_seqlock_irq(&bb->lock);
8913 if (bb->changed == 0 && bb->unacked_exist) {
8916 for (i = 0; i < bb->count ; i++) {
8917 if (!BB_ACK(p[i])) {
8918 sector_t start = BB_OFFSET(p[i]);
8919 int len = BB_LEN(p[i]);
8920 p[i] = BB_MAKE(start, len, 1);
8923 bb->unacked_exist = 0;
8925 write_sequnlock_irq(&bb->lock);
8927 EXPORT_SYMBOL_GPL(md_ack_all_badblocks);
8929 /* sysfs access to bad-blocks list.
8930 * We present two files.
8931 * 'bad-blocks' lists sector numbers and lengths of ranges that
8932 * are recorded as bad. The list is truncated to fit within
8933 * the one-page limit of sysfs.
8934 * Writing "sector length" to this file adds an acknowledged
8936 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
8937 * been acknowledged. Writing to this file adds bad blocks
8938 * without acknowledging them. This is largely for testing.
8942 badblocks_show(struct badblocks *bb, char *page, int unack)
8953 seq = read_seqbegin(&bb->lock);
8958 while (len < PAGE_SIZE && i < bb->count) {
8959 sector_t s = BB_OFFSET(p[i]);
8960 unsigned int length = BB_LEN(p[i]);
8961 int ack = BB_ACK(p[i]);
8967 len += snprintf(page+len, PAGE_SIZE-len, "%llu %u\n",
8968 (unsigned long long)s << bb->shift,
8969 length << bb->shift);
8971 if (unack && len == 0)
8972 bb->unacked_exist = 0;
8974 if (read_seqretry(&bb->lock, seq))
8983 badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack)
8985 unsigned long long sector;
8989 /* Allow clearing via sysfs *only* for testing/debugging.
8990 * Normally only a successful write may clear a badblock
8993 if (page[0] == '-') {
8997 #endif /* DO_DEBUG */
8999 switch (sscanf(page, "%llu %d%c", §or, &length, &newline)) {
9001 if (newline != '\n')
9013 md_clear_badblocks(bb, sector, length);
9016 #endif /* DO_DEBUG */
9017 if (md_set_badblocks(bb, sector, length, !unack))
9023 static int md_notify_reboot(struct notifier_block *this,
9024 unsigned long code, void *x)
9026 struct list_head *tmp;
9027 struct mddev *mddev;
9030 for_each_mddev(mddev, tmp) {
9031 if (mddev_trylock(mddev)) {
9033 __md_stop_writes(mddev);
9034 if (mddev->persistent)
9035 mddev->safemode = 2;
9036 mddev_unlock(mddev);
9041 * certain more exotic SCSI devices are known to be
9042 * volatile wrt too early system reboots. While the
9043 * right place to handle this issue is the given
9044 * driver, we do want to have a safe RAID driver ...
9052 static struct notifier_block md_notifier = {
9053 .notifier_call = md_notify_reboot,
9055 .priority = INT_MAX, /* before any real devices */
9058 static void md_geninit(void)
9060 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
9062 proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops);
9065 static int __init md_init(void)
9069 md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0);
9073 md_misc_wq = alloc_workqueue("md_misc", 0, 0);
9077 if ((ret = register_blkdev(MD_MAJOR, "md")) < 0)
9080 if ((ret = register_blkdev(0, "mdp")) < 0)
9084 blk_register_region(MKDEV(MD_MAJOR, 0), 512, THIS_MODULE,
9085 md_probe, NULL, NULL);
9086 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
9087 md_probe, NULL, NULL);
9089 register_reboot_notifier(&md_notifier);
9090 raid_table_header = register_sysctl_table(raid_root_table);
9096 unregister_blkdev(MD_MAJOR, "md");
9098 destroy_workqueue(md_misc_wq);
9100 destroy_workqueue(md_wq);
9105 static void check_sb_changes(struct mddev *mddev, struct md_rdev *rdev)
9107 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
9108 struct md_rdev *rdev2;
9110 char b[BDEVNAME_SIZE];
9112 /* Check for change of roles in the active devices */
9113 rdev_for_each(rdev2, mddev) {
9114 if (test_bit(Faulty, &rdev2->flags))
9117 /* Check if the roles changed */
9118 role = le16_to_cpu(sb->dev_roles[rdev2->desc_nr]);
9120 if (test_bit(Candidate, &rdev2->flags)) {
9121 if (role == 0xfffe) {
9122 pr_info("md: Removing Candidate device %s because add failed\n", bdevname(rdev2->bdev,b));
9123 md_kick_rdev_from_array(rdev2);
9127 clear_bit(Candidate, &rdev2->flags);
9130 if (role != rdev2->raid_disk) {
9132 if (rdev2->raid_disk == -1 && role != 0xffff) {
9133 rdev2->saved_raid_disk = role;
9134 ret = remove_and_add_spares(mddev, rdev2);
9135 pr_info("Activated spare: %s\n",
9136 bdevname(rdev2->bdev,b));
9140 * We just want to do the minimum to mark the disk
9141 * as faulty. The recovery is performed by the
9142 * one who initiated the error.
9144 if ((role == 0xfffe) || (role == 0xfffd)) {
9145 md_error(mddev, rdev2);
9146 clear_bit(Blocked, &rdev2->flags);
9151 if (mddev->raid_disks != le32_to_cpu(sb->raid_disks))
9152 update_raid_disks(mddev, le32_to_cpu(sb->raid_disks));
9154 /* Finally set the event to be up to date */
9155 mddev->events = le64_to_cpu(sb->events);
9158 static int read_rdev(struct mddev *mddev, struct md_rdev *rdev)
9161 struct page *swapout = rdev->sb_page;
9162 struct mdp_superblock_1 *sb;
9164 /* Store the sb page of the rdev in the swapout temporary
9165 * variable in case we err in the future
9167 rdev->sb_page = NULL;
9168 alloc_disk_sb(rdev);
9169 ClearPageUptodate(rdev->sb_page);
9170 rdev->sb_loaded = 0;
9171 err = super_types[mddev->major_version].load_super(rdev, NULL, mddev->minor_version);
9174 pr_warn("%s: %d Could not reload rdev(%d) err: %d. Restoring old values\n",
9175 __func__, __LINE__, rdev->desc_nr, err);
9176 put_page(rdev->sb_page);
9177 rdev->sb_page = swapout;
9178 rdev->sb_loaded = 1;
9182 sb = page_address(rdev->sb_page);
9183 /* Read the offset unconditionally, even if MD_FEATURE_RECOVERY_OFFSET
9187 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RECOVERY_OFFSET))
9188 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
9190 /* The other node finished recovery, call spare_active to set
9191 * device In_sync and mddev->degraded
9193 if (rdev->recovery_offset == MaxSector &&
9194 !test_bit(In_sync, &rdev->flags) &&
9195 mddev->pers->spare_active(mddev))
9196 sysfs_notify(&mddev->kobj, NULL, "degraded");
9202 void md_reload_sb(struct mddev *mddev, int nr)
9204 struct md_rdev *rdev;
9208 rdev_for_each_rcu(rdev, mddev) {
9209 if (rdev->desc_nr == nr)
9213 if (!rdev || rdev->desc_nr != nr) {
9214 pr_warn("%s: %d Could not find rdev with nr %d\n", __func__, __LINE__, nr);
9218 err = read_rdev(mddev, rdev);
9222 check_sb_changes(mddev, rdev);
9224 /* Read all rdev's to update recovery_offset */
9225 rdev_for_each_rcu(rdev, mddev)
9226 read_rdev(mddev, rdev);
9228 EXPORT_SYMBOL(md_reload_sb);
9233 * Searches all registered partitions for autorun RAID arrays
9237 static LIST_HEAD(all_detected_devices);
9238 struct detected_devices_node {
9239 struct list_head list;
9243 void md_autodetect_dev(dev_t dev)
9245 struct detected_devices_node *node_detected_dev;
9247 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
9248 if (node_detected_dev) {
9249 node_detected_dev->dev = dev;
9250 list_add_tail(&node_detected_dev->list, &all_detected_devices);
9252 printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed"
9253 ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev));
9257 static void autostart_arrays(int part)
9259 struct md_rdev *rdev;
9260 struct detected_devices_node *node_detected_dev;
9262 int i_scanned, i_passed;
9267 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
9269 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
9271 node_detected_dev = list_entry(all_detected_devices.next,
9272 struct detected_devices_node, list);
9273 list_del(&node_detected_dev->list);
9274 dev = node_detected_dev->dev;
9275 kfree(node_detected_dev);
9276 rdev = md_import_device(dev,0, 90);
9280 if (test_bit(Faulty, &rdev->flags))
9283 set_bit(AutoDetected, &rdev->flags);
9284 list_add(&rdev->same_set, &pending_raid_disks);
9288 printk(KERN_INFO "md: Scanned %d and added %d devices.\n",
9289 i_scanned, i_passed);
9291 autorun_devices(part);
9294 #endif /* !MODULE */
9296 static __exit void md_exit(void)
9298 struct mddev *mddev;
9299 struct list_head *tmp;
9302 blk_unregister_region(MKDEV(MD_MAJOR,0), 512);
9303 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
9305 unregister_blkdev(MD_MAJOR,"md");
9306 unregister_blkdev(mdp_major, "mdp");
9307 unregister_reboot_notifier(&md_notifier);
9308 unregister_sysctl_table(raid_table_header);
9310 /* We cannot unload the modules while some process is
9311 * waiting for us in select() or poll() - wake them up
9314 while (waitqueue_active(&md_event_waiters)) {
9315 /* not safe to leave yet */
9316 wake_up(&md_event_waiters);
9320 remove_proc_entry("mdstat", NULL);
9322 for_each_mddev(mddev, tmp) {
9323 export_array(mddev);
9324 mddev->hold_active = 0;
9326 destroy_workqueue(md_misc_wq);
9327 destroy_workqueue(md_wq);
9330 subsys_initcall(md_init);
9331 module_exit(md_exit)
9333 static int get_ro(char *buffer, struct kernel_param *kp)
9335 return sprintf(buffer, "%d", start_readonly);
9337 static int set_ro(const char *val, struct kernel_param *kp)
9339 return kstrtouint(val, 10, (unsigned int *)&start_readonly);
9342 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
9343 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
9344 module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR);
9346 MODULE_LICENSE("GPL");
9347 MODULE_DESCRIPTION("MD RAID framework");
9349 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);