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>
58 static void autostart_arrays(int part);
61 /* pers_list is a list of registered personalities protected
63 * pers_lock does extra service to protect accesses to
64 * mddev->thread when the mutex cannot be held.
66 static LIST_HEAD(pers_list);
67 static DEFINE_SPINLOCK(pers_lock);
69 static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
70 static struct workqueue_struct *md_wq;
71 static struct workqueue_struct *md_misc_wq;
73 static int remove_and_add_spares(struct mddev *mddev,
74 struct md_rdev *this);
75 static void mddev_detach(struct mddev *mddev);
78 * Default number of read corrections we'll attempt on an rdev
79 * before ejecting it from the array. We divide the read error
80 * count by 2 for every hour elapsed between read errors.
82 #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
84 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
85 * is 1000 KB/sec, so the extra system load does not show up that much.
86 * Increase it if you want to have more _guaranteed_ speed. Note that
87 * the RAID driver will use the maximum available bandwidth if the IO
88 * subsystem is idle. There is also an 'absolute maximum' reconstruction
89 * speed limit - in case reconstruction slows down your system despite
92 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
93 * or /sys/block/mdX/md/sync_speed_{min,max}
96 static int sysctl_speed_limit_min = 1000;
97 static int sysctl_speed_limit_max = 200000;
98 static inline int speed_min(struct mddev *mddev)
100 return mddev->sync_speed_min ?
101 mddev->sync_speed_min : sysctl_speed_limit_min;
104 static inline int speed_max(struct mddev *mddev)
106 return mddev->sync_speed_max ?
107 mddev->sync_speed_max : sysctl_speed_limit_max;
110 static struct ctl_table_header *raid_table_header;
112 static struct ctl_table raid_table[] = {
114 .procname = "speed_limit_min",
115 .data = &sysctl_speed_limit_min,
116 .maxlen = sizeof(int),
117 .mode = S_IRUGO|S_IWUSR,
118 .proc_handler = proc_dointvec,
121 .procname = "speed_limit_max",
122 .data = &sysctl_speed_limit_max,
123 .maxlen = sizeof(int),
124 .mode = S_IRUGO|S_IWUSR,
125 .proc_handler = proc_dointvec,
130 static struct ctl_table raid_dir_table[] = {
134 .mode = S_IRUGO|S_IXUGO,
140 static struct ctl_table raid_root_table[] = {
145 .child = raid_dir_table,
150 static const struct block_device_operations md_fops;
152 static int start_readonly;
155 * like bio_clone, but with a local bio set
158 struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs,
163 if (!mddev || !mddev->bio_set)
164 return bio_alloc(gfp_mask, nr_iovecs);
166 b = bio_alloc_bioset(gfp_mask, nr_iovecs, mddev->bio_set);
171 EXPORT_SYMBOL_GPL(bio_alloc_mddev);
173 struct bio *bio_clone_mddev(struct bio *bio, gfp_t gfp_mask,
176 if (!mddev || !mddev->bio_set)
177 return bio_clone(bio, gfp_mask);
179 return bio_clone_bioset(bio, gfp_mask, mddev->bio_set);
181 EXPORT_SYMBOL_GPL(bio_clone_mddev);
184 * We have a system wide 'event count' that is incremented
185 * on any 'interesting' event, and readers of /proc/mdstat
186 * can use 'poll' or 'select' to find out when the event
190 * start array, stop array, error, add device, remove device,
191 * start build, activate spare
193 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
194 static atomic_t md_event_count;
195 void md_new_event(struct mddev *mddev)
197 atomic_inc(&md_event_count);
198 wake_up(&md_event_waiters);
200 EXPORT_SYMBOL_GPL(md_new_event);
202 /* Alternate version that can be called from interrupts
203 * when calling sysfs_notify isn't needed.
205 static void md_new_event_inintr(struct mddev *mddev)
207 atomic_inc(&md_event_count);
208 wake_up(&md_event_waiters);
212 * Enables to iterate over all existing md arrays
213 * all_mddevs_lock protects this list.
215 static LIST_HEAD(all_mddevs);
216 static DEFINE_SPINLOCK(all_mddevs_lock);
219 * iterates through all used mddevs in the system.
220 * We take care to grab the all_mddevs_lock whenever navigating
221 * the list, and to always hold a refcount when unlocked.
222 * Any code which breaks out of this loop while own
223 * a reference to the current mddev and must mddev_put it.
225 #define for_each_mddev(_mddev,_tmp) \
227 for (({ spin_lock(&all_mddevs_lock); \
228 _tmp = all_mddevs.next; \
230 ({ if (_tmp != &all_mddevs) \
231 mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\
232 spin_unlock(&all_mddevs_lock); \
233 if (_mddev) mddev_put(_mddev); \
234 _mddev = list_entry(_tmp, struct mddev, all_mddevs); \
235 _tmp != &all_mddevs;}); \
236 ({ spin_lock(&all_mddevs_lock); \
237 _tmp = _tmp->next;}) \
240 /* Rather than calling directly into the personality make_request function,
241 * IO requests come here first so that we can check if the device is
242 * being suspended pending a reconfiguration.
243 * We hold a refcount over the call to ->make_request. By the time that
244 * call has finished, the bio has been linked into some internal structure
245 * and so is visible to ->quiesce(), so we don't need the refcount any more.
247 static void md_make_request(struct request_queue *q, struct bio *bio)
249 const int rw = bio_data_dir(bio);
250 struct mddev *mddev = q->queuedata;
251 unsigned int sectors;
253 if (mddev == NULL || mddev->pers == NULL
258 if (mddev->ro == 1 && unlikely(rw == WRITE)) {
259 bio_endio(bio, bio_sectors(bio) == 0 ? 0 : -EROFS);
262 smp_rmb(); /* Ensure implications of 'active' are visible */
264 if (mddev->suspended) {
267 prepare_to_wait(&mddev->sb_wait, &__wait,
268 TASK_UNINTERRUPTIBLE);
269 if (!mddev->suspended)
275 finish_wait(&mddev->sb_wait, &__wait);
277 atomic_inc(&mddev->active_io);
281 * save the sectors now since our bio can
282 * go away inside make_request
284 sectors = bio_sectors(bio);
285 mddev->pers->make_request(mddev, bio);
287 generic_start_io_acct(rw, sectors, &mddev->gendisk->part0);
289 if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended)
290 wake_up(&mddev->sb_wait);
293 /* mddev_suspend makes sure no new requests are submitted
294 * to the device, and that any requests that have been submitted
295 * are completely handled.
296 * Once mddev_detach() is called and completes, the module will be
299 void mddev_suspend(struct mddev *mddev)
301 BUG_ON(mddev->suspended);
302 mddev->suspended = 1;
304 wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0);
305 mddev->pers->quiesce(mddev, 1);
307 del_timer_sync(&mddev->safemode_timer);
309 EXPORT_SYMBOL_GPL(mddev_suspend);
311 void mddev_resume(struct mddev *mddev)
313 mddev->suspended = 0;
314 wake_up(&mddev->sb_wait);
315 mddev->pers->quiesce(mddev, 0);
317 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
318 md_wakeup_thread(mddev->thread);
319 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
321 EXPORT_SYMBOL_GPL(mddev_resume);
323 int mddev_congested(struct mddev *mddev, int bits)
325 struct md_personality *pers = mddev->pers;
329 if (mddev->suspended)
331 else if (pers && pers->congested)
332 ret = pers->congested(mddev, bits);
336 EXPORT_SYMBOL_GPL(mddev_congested);
337 static int md_congested(void *data, int bits)
339 struct mddev *mddev = data;
340 return mddev_congested(mddev, bits);
343 static int md_mergeable_bvec(struct request_queue *q,
344 struct bvec_merge_data *bvm,
345 struct bio_vec *biovec)
347 struct mddev *mddev = q->queuedata;
350 if (mddev->suspended) {
351 /* Must always allow one vec */
352 if (bvm->bi_size == 0)
353 ret = biovec->bv_len;
357 struct md_personality *pers = mddev->pers;
358 if (pers && pers->mergeable_bvec)
359 ret = pers->mergeable_bvec(mddev, bvm, biovec);
361 ret = biovec->bv_len;
367 * Generic flush handling for md
370 static void md_end_flush(struct bio *bio, int err)
372 struct md_rdev *rdev = bio->bi_private;
373 struct mddev *mddev = rdev->mddev;
375 rdev_dec_pending(rdev, mddev);
377 if (atomic_dec_and_test(&mddev->flush_pending)) {
378 /* The pre-request flush has finished */
379 queue_work(md_wq, &mddev->flush_work);
384 static void md_submit_flush_data(struct work_struct *ws);
386 static void submit_flushes(struct work_struct *ws)
388 struct mddev *mddev = container_of(ws, struct mddev, flush_work);
389 struct md_rdev *rdev;
391 INIT_WORK(&mddev->flush_work, md_submit_flush_data);
392 atomic_set(&mddev->flush_pending, 1);
394 rdev_for_each_rcu(rdev, mddev)
395 if (rdev->raid_disk >= 0 &&
396 !test_bit(Faulty, &rdev->flags)) {
397 /* Take two references, one is dropped
398 * when request finishes, one after
399 * we reclaim rcu_read_lock
402 atomic_inc(&rdev->nr_pending);
403 atomic_inc(&rdev->nr_pending);
405 bi = bio_alloc_mddev(GFP_NOIO, 0, mddev);
406 bi->bi_end_io = md_end_flush;
407 bi->bi_private = rdev;
408 bi->bi_bdev = rdev->bdev;
409 atomic_inc(&mddev->flush_pending);
410 submit_bio(WRITE_FLUSH, bi);
412 rdev_dec_pending(rdev, mddev);
415 if (atomic_dec_and_test(&mddev->flush_pending))
416 queue_work(md_wq, &mddev->flush_work);
419 static void md_submit_flush_data(struct work_struct *ws)
421 struct mddev *mddev = container_of(ws, struct mddev, flush_work);
422 struct bio *bio = mddev->flush_bio;
424 if (bio->bi_iter.bi_size == 0)
425 /* an empty barrier - all done */
428 bio->bi_rw &= ~REQ_FLUSH;
429 mddev->pers->make_request(mddev, bio);
432 mddev->flush_bio = NULL;
433 wake_up(&mddev->sb_wait);
436 void md_flush_request(struct mddev *mddev, struct bio *bio)
438 spin_lock_irq(&mddev->lock);
439 wait_event_lock_irq(mddev->sb_wait,
442 mddev->flush_bio = bio;
443 spin_unlock_irq(&mddev->lock);
445 INIT_WORK(&mddev->flush_work, submit_flushes);
446 queue_work(md_wq, &mddev->flush_work);
448 EXPORT_SYMBOL(md_flush_request);
450 void md_unplug(struct blk_plug_cb *cb, bool from_schedule)
452 struct mddev *mddev = cb->data;
453 md_wakeup_thread(mddev->thread);
456 EXPORT_SYMBOL(md_unplug);
458 static inline struct mddev *mddev_get(struct mddev *mddev)
460 atomic_inc(&mddev->active);
464 static void mddev_delayed_delete(struct work_struct *ws);
466 static void mddev_put(struct mddev *mddev)
468 struct bio_set *bs = NULL;
470 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
472 if (!mddev->raid_disks && list_empty(&mddev->disks) &&
473 mddev->ctime == 0 && !mddev->hold_active) {
474 /* Array is not configured at all, and not held active,
476 list_del_init(&mddev->all_mddevs);
478 mddev->bio_set = NULL;
479 if (mddev->gendisk) {
480 /* We did a probe so need to clean up. Call
481 * queue_work inside the spinlock so that
482 * flush_workqueue() after mddev_find will
483 * succeed in waiting for the work to be done.
485 INIT_WORK(&mddev->del_work, mddev_delayed_delete);
486 queue_work(md_misc_wq, &mddev->del_work);
490 spin_unlock(&all_mddevs_lock);
495 void mddev_init(struct mddev *mddev)
497 mutex_init(&mddev->open_mutex);
498 mutex_init(&mddev->reconfig_mutex);
499 mutex_init(&mddev->bitmap_info.mutex);
500 INIT_LIST_HEAD(&mddev->disks);
501 INIT_LIST_HEAD(&mddev->all_mddevs);
502 init_timer(&mddev->safemode_timer);
503 atomic_set(&mddev->active, 1);
504 atomic_set(&mddev->openers, 0);
505 atomic_set(&mddev->active_io, 0);
506 spin_lock_init(&mddev->lock);
507 atomic_set(&mddev->flush_pending, 0);
508 init_waitqueue_head(&mddev->sb_wait);
509 init_waitqueue_head(&mddev->recovery_wait);
510 mddev->reshape_position = MaxSector;
511 mddev->reshape_backwards = 0;
512 mddev->last_sync_action = "none";
513 mddev->resync_min = 0;
514 mddev->resync_max = MaxSector;
515 mddev->level = LEVEL_NONE;
517 EXPORT_SYMBOL_GPL(mddev_init);
519 static struct mddev *mddev_find(dev_t unit)
521 struct mddev *mddev, *new = NULL;
523 if (unit && MAJOR(unit) != MD_MAJOR)
524 unit &= ~((1<<MdpMinorShift)-1);
527 spin_lock(&all_mddevs_lock);
530 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
531 if (mddev->unit == unit) {
533 spin_unlock(&all_mddevs_lock);
539 list_add(&new->all_mddevs, &all_mddevs);
540 spin_unlock(&all_mddevs_lock);
541 new->hold_active = UNTIL_IOCTL;
545 /* find an unused unit number */
546 static int next_minor = 512;
547 int start = next_minor;
551 dev = MKDEV(MD_MAJOR, next_minor);
553 if (next_minor > MINORMASK)
555 if (next_minor == start) {
556 /* Oh dear, all in use. */
557 spin_unlock(&all_mddevs_lock);
563 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
564 if (mddev->unit == dev) {
570 new->md_minor = MINOR(dev);
571 new->hold_active = UNTIL_STOP;
572 list_add(&new->all_mddevs, &all_mddevs);
573 spin_unlock(&all_mddevs_lock);
576 spin_unlock(&all_mddevs_lock);
578 new = kzalloc(sizeof(*new), GFP_KERNEL);
583 if (MAJOR(unit) == MD_MAJOR)
584 new->md_minor = MINOR(unit);
586 new->md_minor = MINOR(unit) >> MdpMinorShift;
593 static inline int __must_check mddev_lock(struct mddev *mddev)
595 return mutex_lock_interruptible(&mddev->reconfig_mutex);
598 /* Sometimes we need to take the lock in a situation where
599 * failure due to interrupts is not acceptable.
601 static inline void mddev_lock_nointr(struct mddev *mddev)
603 mutex_lock(&mddev->reconfig_mutex);
606 static inline int mddev_is_locked(struct mddev *mddev)
608 return mutex_is_locked(&mddev->reconfig_mutex);
611 static inline int mddev_trylock(struct mddev *mddev)
613 return mutex_trylock(&mddev->reconfig_mutex);
616 static struct attribute_group md_redundancy_group;
618 static void mddev_unlock(struct mddev *mddev)
620 if (mddev->to_remove) {
621 /* These cannot be removed under reconfig_mutex as
622 * an access to the files will try to take reconfig_mutex
623 * while holding the file unremovable, which leads to
625 * So hold set sysfs_active while the remove in happeing,
626 * and anything else which might set ->to_remove or my
627 * otherwise change the sysfs namespace will fail with
628 * -EBUSY if sysfs_active is still set.
629 * We set sysfs_active under reconfig_mutex and elsewhere
630 * test it under the same mutex to ensure its correct value
633 struct attribute_group *to_remove = mddev->to_remove;
634 mddev->to_remove = NULL;
635 mddev->sysfs_active = 1;
636 mutex_unlock(&mddev->reconfig_mutex);
638 if (mddev->kobj.sd) {
639 if (to_remove != &md_redundancy_group)
640 sysfs_remove_group(&mddev->kobj, to_remove);
641 if (mddev->pers == NULL ||
642 mddev->pers->sync_request == NULL) {
643 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
644 if (mddev->sysfs_action)
645 sysfs_put(mddev->sysfs_action);
646 mddev->sysfs_action = NULL;
649 mddev->sysfs_active = 0;
651 mutex_unlock(&mddev->reconfig_mutex);
653 /* As we've dropped the mutex we need a spinlock to
654 * make sure the thread doesn't disappear
656 spin_lock(&pers_lock);
657 md_wakeup_thread(mddev->thread);
658 spin_unlock(&pers_lock);
661 static struct md_rdev *find_rdev_nr_rcu(struct mddev *mddev, int nr)
663 struct md_rdev *rdev;
665 rdev_for_each_rcu(rdev, mddev)
666 if (rdev->desc_nr == nr)
672 static struct md_rdev *find_rdev(struct mddev *mddev, dev_t dev)
674 struct md_rdev *rdev;
676 rdev_for_each(rdev, mddev)
677 if (rdev->bdev->bd_dev == dev)
683 static struct md_rdev *find_rdev_rcu(struct mddev *mddev, dev_t dev)
685 struct md_rdev *rdev;
687 rdev_for_each_rcu(rdev, mddev)
688 if (rdev->bdev->bd_dev == dev)
694 static struct md_personality *find_pers(int level, char *clevel)
696 struct md_personality *pers;
697 list_for_each_entry(pers, &pers_list, list) {
698 if (level != LEVEL_NONE && pers->level == level)
700 if (strcmp(pers->name, clevel)==0)
706 /* return the offset of the super block in 512byte sectors */
707 static inline sector_t calc_dev_sboffset(struct md_rdev *rdev)
709 sector_t num_sectors = i_size_read(rdev->bdev->bd_inode) / 512;
710 return MD_NEW_SIZE_SECTORS(num_sectors);
713 static int alloc_disk_sb(struct md_rdev *rdev)
715 rdev->sb_page = alloc_page(GFP_KERNEL);
716 if (!rdev->sb_page) {
717 printk(KERN_ALERT "md: out of memory.\n");
724 void md_rdev_clear(struct md_rdev *rdev)
727 put_page(rdev->sb_page);
729 rdev->sb_page = NULL;
734 put_page(rdev->bb_page);
735 rdev->bb_page = NULL;
737 kfree(rdev->badblocks.page);
738 rdev->badblocks.page = NULL;
740 EXPORT_SYMBOL_GPL(md_rdev_clear);
742 static void super_written(struct bio *bio, int error)
744 struct md_rdev *rdev = bio->bi_private;
745 struct mddev *mddev = rdev->mddev;
747 if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) {
748 printk("md: super_written gets error=%d, uptodate=%d\n",
749 error, test_bit(BIO_UPTODATE, &bio->bi_flags));
750 WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags));
751 md_error(mddev, rdev);
754 if (atomic_dec_and_test(&mddev->pending_writes))
755 wake_up(&mddev->sb_wait);
759 void md_super_write(struct mddev *mddev, struct md_rdev *rdev,
760 sector_t sector, int size, struct page *page)
762 /* write first size bytes of page to sector of rdev
763 * Increment mddev->pending_writes before returning
764 * and decrement it on completion, waking up sb_wait
765 * if zero is reached.
766 * If an error occurred, call md_error
768 struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, mddev);
770 bio->bi_bdev = rdev->meta_bdev ? rdev->meta_bdev : rdev->bdev;
771 bio->bi_iter.bi_sector = sector;
772 bio_add_page(bio, page, size, 0);
773 bio->bi_private = rdev;
774 bio->bi_end_io = super_written;
776 atomic_inc(&mddev->pending_writes);
777 submit_bio(WRITE_FLUSH_FUA, bio);
780 void md_super_wait(struct mddev *mddev)
782 /* wait for all superblock writes that were scheduled to complete */
783 wait_event(mddev->sb_wait, atomic_read(&mddev->pending_writes)==0);
786 int sync_page_io(struct md_rdev *rdev, sector_t sector, int size,
787 struct page *page, int rw, bool metadata_op)
789 struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, rdev->mddev);
792 bio->bi_bdev = (metadata_op && rdev->meta_bdev) ?
793 rdev->meta_bdev : rdev->bdev;
795 bio->bi_iter.bi_sector = sector + rdev->sb_start;
796 else if (rdev->mddev->reshape_position != MaxSector &&
797 (rdev->mddev->reshape_backwards ==
798 (sector >= rdev->mddev->reshape_position)))
799 bio->bi_iter.bi_sector = sector + rdev->new_data_offset;
801 bio->bi_iter.bi_sector = sector + rdev->data_offset;
802 bio_add_page(bio, page, size, 0);
803 submit_bio_wait(rw, bio);
805 ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
809 EXPORT_SYMBOL_GPL(sync_page_io);
811 static int read_disk_sb(struct md_rdev *rdev, int size)
813 char b[BDEVNAME_SIZE];
818 if (!sync_page_io(rdev, 0, size, rdev->sb_page, READ, true))
824 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
825 bdevname(rdev->bdev,b));
829 static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
831 return sb1->set_uuid0 == sb2->set_uuid0 &&
832 sb1->set_uuid1 == sb2->set_uuid1 &&
833 sb1->set_uuid2 == sb2->set_uuid2 &&
834 sb1->set_uuid3 == sb2->set_uuid3;
837 static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
840 mdp_super_t *tmp1, *tmp2;
842 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
843 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
845 if (!tmp1 || !tmp2) {
847 printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n");
855 * nr_disks is not constant
860 ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0);
867 static u32 md_csum_fold(u32 csum)
869 csum = (csum & 0xffff) + (csum >> 16);
870 return (csum & 0xffff) + (csum >> 16);
873 static unsigned int calc_sb_csum(mdp_super_t *sb)
876 u32 *sb32 = (u32*)sb;
878 unsigned int disk_csum, csum;
880 disk_csum = sb->sb_csum;
883 for (i = 0; i < MD_SB_BYTES/4 ; i++)
885 csum = (newcsum & 0xffffffff) + (newcsum>>32);
888 /* This used to use csum_partial, which was wrong for several
889 * reasons including that different results are returned on
890 * different architectures. It isn't critical that we get exactly
891 * the same return value as before (we always csum_fold before
892 * testing, and that removes any differences). However as we
893 * know that csum_partial always returned a 16bit value on
894 * alphas, do a fold to maximise conformity to previous behaviour.
896 sb->sb_csum = md_csum_fold(disk_csum);
898 sb->sb_csum = disk_csum;
904 * Handle superblock details.
905 * We want to be able to handle multiple superblock formats
906 * so we have a common interface to them all, and an array of
907 * different handlers.
908 * We rely on user-space to write the initial superblock, and support
909 * reading and updating of superblocks.
910 * Interface methods are:
911 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version)
912 * loads and validates a superblock on dev.
913 * if refdev != NULL, compare superblocks on both devices
915 * 0 - dev has a superblock that is compatible with refdev
916 * 1 - dev has a superblock that is compatible and newer than refdev
917 * so dev should be used as the refdev in future
918 * -EINVAL superblock incompatible or invalid
919 * -othererror e.g. -EIO
921 * int validate_super(struct mddev *mddev, struct md_rdev *dev)
922 * Verify that dev is acceptable into mddev.
923 * The first time, mddev->raid_disks will be 0, and data from
924 * dev should be merged in. Subsequent calls check that dev
925 * is new enough. Return 0 or -EINVAL
927 * void sync_super(struct mddev *mddev, struct md_rdev *dev)
928 * Update the superblock for rdev with data in mddev
929 * This does not write to disc.
935 struct module *owner;
936 int (*load_super)(struct md_rdev *rdev,
937 struct md_rdev *refdev,
939 int (*validate_super)(struct mddev *mddev,
940 struct md_rdev *rdev);
941 void (*sync_super)(struct mddev *mddev,
942 struct md_rdev *rdev);
943 unsigned long long (*rdev_size_change)(struct md_rdev *rdev,
944 sector_t num_sectors);
945 int (*allow_new_offset)(struct md_rdev *rdev,
946 unsigned long long new_offset);
950 * Check that the given mddev has no bitmap.
952 * This function is called from the run method of all personalities that do not
953 * support bitmaps. It prints an error message and returns non-zero if mddev
954 * has a bitmap. Otherwise, it returns 0.
957 int md_check_no_bitmap(struct mddev *mddev)
959 if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset)
961 printk(KERN_ERR "%s: bitmaps are not supported for %s\n",
962 mdname(mddev), mddev->pers->name);
965 EXPORT_SYMBOL(md_check_no_bitmap);
968 * load_super for 0.90.0
970 static int super_90_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
972 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
977 * Calculate the position of the superblock (512byte sectors),
978 * it's at the end of the disk.
980 * It also happens to be a multiple of 4Kb.
982 rdev->sb_start = calc_dev_sboffset(rdev);
984 ret = read_disk_sb(rdev, MD_SB_BYTES);
989 bdevname(rdev->bdev, b);
990 sb = page_address(rdev->sb_page);
992 if (sb->md_magic != MD_SB_MAGIC) {
993 printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
998 if (sb->major_version != 0 ||
999 sb->minor_version < 90 ||
1000 sb->minor_version > 91) {
1001 printk(KERN_WARNING "Bad version number %d.%d on %s\n",
1002 sb->major_version, sb->minor_version,
1007 if (sb->raid_disks <= 0)
1010 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
1011 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
1016 rdev->preferred_minor = sb->md_minor;
1017 rdev->data_offset = 0;
1018 rdev->new_data_offset = 0;
1019 rdev->sb_size = MD_SB_BYTES;
1020 rdev->badblocks.shift = -1;
1022 if (sb->level == LEVEL_MULTIPATH)
1025 rdev->desc_nr = sb->this_disk.number;
1031 mdp_super_t *refsb = page_address(refdev->sb_page);
1032 if (!uuid_equal(refsb, sb)) {
1033 printk(KERN_WARNING "md: %s has different UUID to %s\n",
1034 b, bdevname(refdev->bdev,b2));
1037 if (!sb_equal(refsb, sb)) {
1038 printk(KERN_WARNING "md: %s has same UUID"
1039 " but different superblock to %s\n",
1040 b, bdevname(refdev->bdev, b2));
1044 ev2 = md_event(refsb);
1050 rdev->sectors = rdev->sb_start;
1051 /* Limit to 4TB as metadata cannot record more than that.
1052 * (not needed for Linear and RAID0 as metadata doesn't
1055 if (rdev->sectors >= (2ULL << 32) && sb->level >= 1)
1056 rdev->sectors = (2ULL << 32) - 2;
1058 if (rdev->sectors < ((sector_t)sb->size) * 2 && sb->level >= 1)
1059 /* "this cannot possibly happen" ... */
1067 * validate_super for 0.90.0
1069 static int super_90_validate(struct mddev *mddev, struct md_rdev *rdev)
1072 mdp_super_t *sb = page_address(rdev->sb_page);
1073 __u64 ev1 = md_event(sb);
1075 rdev->raid_disk = -1;
1076 clear_bit(Faulty, &rdev->flags);
1077 clear_bit(In_sync, &rdev->flags);
1078 clear_bit(Bitmap_sync, &rdev->flags);
1079 clear_bit(WriteMostly, &rdev->flags);
1081 if (mddev->raid_disks == 0) {
1082 mddev->major_version = 0;
1083 mddev->minor_version = sb->minor_version;
1084 mddev->patch_version = sb->patch_version;
1085 mddev->external = 0;
1086 mddev->chunk_sectors = sb->chunk_size >> 9;
1087 mddev->ctime = sb->ctime;
1088 mddev->utime = sb->utime;
1089 mddev->level = sb->level;
1090 mddev->clevel[0] = 0;
1091 mddev->layout = sb->layout;
1092 mddev->raid_disks = sb->raid_disks;
1093 mddev->dev_sectors = ((sector_t)sb->size) * 2;
1094 mddev->events = ev1;
1095 mddev->bitmap_info.offset = 0;
1096 mddev->bitmap_info.space = 0;
1097 /* bitmap can use 60 K after the 4K superblocks */
1098 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
1099 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
1100 mddev->reshape_backwards = 0;
1102 if (mddev->minor_version >= 91) {
1103 mddev->reshape_position = sb->reshape_position;
1104 mddev->delta_disks = sb->delta_disks;
1105 mddev->new_level = sb->new_level;
1106 mddev->new_layout = sb->new_layout;
1107 mddev->new_chunk_sectors = sb->new_chunk >> 9;
1108 if (mddev->delta_disks < 0)
1109 mddev->reshape_backwards = 1;
1111 mddev->reshape_position = MaxSector;
1112 mddev->delta_disks = 0;
1113 mddev->new_level = mddev->level;
1114 mddev->new_layout = mddev->layout;
1115 mddev->new_chunk_sectors = mddev->chunk_sectors;
1118 if (sb->state & (1<<MD_SB_CLEAN))
1119 mddev->recovery_cp = MaxSector;
1121 if (sb->events_hi == sb->cp_events_hi &&
1122 sb->events_lo == sb->cp_events_lo) {
1123 mddev->recovery_cp = sb->recovery_cp;
1125 mddev->recovery_cp = 0;
1128 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
1129 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
1130 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
1131 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
1133 mddev->max_disks = MD_SB_DISKS;
1135 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
1136 mddev->bitmap_info.file == NULL) {
1137 mddev->bitmap_info.offset =
1138 mddev->bitmap_info.default_offset;
1139 mddev->bitmap_info.space =
1140 mddev->bitmap_info.default_space;
1143 } else if (mddev->pers == NULL) {
1144 /* Insist on good event counter while assembling, except
1145 * for spares (which don't need an event count) */
1147 if (sb->disks[rdev->desc_nr].state & (
1148 (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE)))
1149 if (ev1 < mddev->events)
1151 } else if (mddev->bitmap) {
1152 /* if adding to array with a bitmap, then we can accept an
1153 * older device ... but not too old.
1155 if (ev1 < mddev->bitmap->events_cleared)
1157 if (ev1 < mddev->events)
1158 set_bit(Bitmap_sync, &rdev->flags);
1160 if (ev1 < mddev->events)
1161 /* just a hot-add of a new device, leave raid_disk at -1 */
1165 if (mddev->level != LEVEL_MULTIPATH) {
1166 desc = sb->disks + rdev->desc_nr;
1168 if (desc->state & (1<<MD_DISK_FAULTY))
1169 set_bit(Faulty, &rdev->flags);
1170 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
1171 desc->raid_disk < mddev->raid_disks */) {
1172 set_bit(In_sync, &rdev->flags);
1173 rdev->raid_disk = desc->raid_disk;
1174 rdev->saved_raid_disk = desc->raid_disk;
1175 } else if (desc->state & (1<<MD_DISK_ACTIVE)) {
1176 /* active but not in sync implies recovery up to
1177 * reshape position. We don't know exactly where
1178 * that is, so set to zero for now */
1179 if (mddev->minor_version >= 91) {
1180 rdev->recovery_offset = 0;
1181 rdev->raid_disk = desc->raid_disk;
1184 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
1185 set_bit(WriteMostly, &rdev->flags);
1186 } else /* MULTIPATH are always insync */
1187 set_bit(In_sync, &rdev->flags);
1192 * sync_super for 0.90.0
1194 static void super_90_sync(struct mddev *mddev, struct md_rdev *rdev)
1197 struct md_rdev *rdev2;
1198 int next_spare = mddev->raid_disks;
1200 /* make rdev->sb match mddev data..
1203 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1204 * 3/ any empty disks < next_spare become removed
1206 * disks[0] gets initialised to REMOVED because
1207 * we cannot be sure from other fields if it has
1208 * been initialised or not.
1211 int active=0, working=0,failed=0,spare=0,nr_disks=0;
1213 rdev->sb_size = MD_SB_BYTES;
1215 sb = page_address(rdev->sb_page);
1217 memset(sb, 0, sizeof(*sb));
1219 sb->md_magic = MD_SB_MAGIC;
1220 sb->major_version = mddev->major_version;
1221 sb->patch_version = mddev->patch_version;
1222 sb->gvalid_words = 0; /* ignored */
1223 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
1224 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
1225 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
1226 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
1228 sb->ctime = mddev->ctime;
1229 sb->level = mddev->level;
1230 sb->size = mddev->dev_sectors / 2;
1231 sb->raid_disks = mddev->raid_disks;
1232 sb->md_minor = mddev->md_minor;
1233 sb->not_persistent = 0;
1234 sb->utime = mddev->utime;
1236 sb->events_hi = (mddev->events>>32);
1237 sb->events_lo = (u32)mddev->events;
1239 if (mddev->reshape_position == MaxSector)
1240 sb->minor_version = 90;
1242 sb->minor_version = 91;
1243 sb->reshape_position = mddev->reshape_position;
1244 sb->new_level = mddev->new_level;
1245 sb->delta_disks = mddev->delta_disks;
1246 sb->new_layout = mddev->new_layout;
1247 sb->new_chunk = mddev->new_chunk_sectors << 9;
1249 mddev->minor_version = sb->minor_version;
1252 sb->recovery_cp = mddev->recovery_cp;
1253 sb->cp_events_hi = (mddev->events>>32);
1254 sb->cp_events_lo = (u32)mddev->events;
1255 if (mddev->recovery_cp == MaxSector)
1256 sb->state = (1<< MD_SB_CLEAN);
1258 sb->recovery_cp = 0;
1260 sb->layout = mddev->layout;
1261 sb->chunk_size = mddev->chunk_sectors << 9;
1263 if (mddev->bitmap && mddev->bitmap_info.file == NULL)
1264 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
1266 sb->disks[0].state = (1<<MD_DISK_REMOVED);
1267 rdev_for_each(rdev2, mddev) {
1270 int is_active = test_bit(In_sync, &rdev2->flags);
1272 if (rdev2->raid_disk >= 0 &&
1273 sb->minor_version >= 91)
1274 /* we have nowhere to store the recovery_offset,
1275 * but if it is not below the reshape_position,
1276 * we can piggy-back on that.
1279 if (rdev2->raid_disk < 0 ||
1280 test_bit(Faulty, &rdev2->flags))
1283 desc_nr = rdev2->raid_disk;
1285 desc_nr = next_spare++;
1286 rdev2->desc_nr = desc_nr;
1287 d = &sb->disks[rdev2->desc_nr];
1289 d->number = rdev2->desc_nr;
1290 d->major = MAJOR(rdev2->bdev->bd_dev);
1291 d->minor = MINOR(rdev2->bdev->bd_dev);
1293 d->raid_disk = rdev2->raid_disk;
1295 d->raid_disk = rdev2->desc_nr; /* compatibility */
1296 if (test_bit(Faulty, &rdev2->flags))
1297 d->state = (1<<MD_DISK_FAULTY);
1298 else if (is_active) {
1299 d->state = (1<<MD_DISK_ACTIVE);
1300 if (test_bit(In_sync, &rdev2->flags))
1301 d->state |= (1<<MD_DISK_SYNC);
1309 if (test_bit(WriteMostly, &rdev2->flags))
1310 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1312 /* now set the "removed" and "faulty" bits on any missing devices */
1313 for (i=0 ; i < mddev->raid_disks ; i++) {
1314 mdp_disk_t *d = &sb->disks[i];
1315 if (d->state == 0 && d->number == 0) {
1318 d->state = (1<<MD_DISK_REMOVED);
1319 d->state |= (1<<MD_DISK_FAULTY);
1323 sb->nr_disks = nr_disks;
1324 sb->active_disks = active;
1325 sb->working_disks = working;
1326 sb->failed_disks = failed;
1327 sb->spare_disks = spare;
1329 sb->this_disk = sb->disks[rdev->desc_nr];
1330 sb->sb_csum = calc_sb_csum(sb);
1334 * rdev_size_change for 0.90.0
1336 static unsigned long long
1337 super_90_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
1339 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1340 return 0; /* component must fit device */
1341 if (rdev->mddev->bitmap_info.offset)
1342 return 0; /* can't move bitmap */
1343 rdev->sb_start = calc_dev_sboffset(rdev);
1344 if (!num_sectors || num_sectors > rdev->sb_start)
1345 num_sectors = rdev->sb_start;
1346 /* Limit to 4TB as metadata cannot record more than that.
1347 * 4TB == 2^32 KB, or 2*2^32 sectors.
1349 if (num_sectors >= (2ULL << 32) && rdev->mddev->level >= 1)
1350 num_sectors = (2ULL << 32) - 2;
1351 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1353 md_super_wait(rdev->mddev);
1358 super_90_allow_new_offset(struct md_rdev *rdev, unsigned long long new_offset)
1360 /* non-zero offset changes not possible with v0.90 */
1361 return new_offset == 0;
1365 * version 1 superblock
1368 static __le32 calc_sb_1_csum(struct mdp_superblock_1 *sb)
1372 unsigned long long newcsum;
1373 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1374 __le32 *isuper = (__le32*)sb;
1376 disk_csum = sb->sb_csum;
1379 for (; size >= 4; size -= 4)
1380 newcsum += le32_to_cpu(*isuper++);
1383 newcsum += le16_to_cpu(*(__le16*) isuper);
1385 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1386 sb->sb_csum = disk_csum;
1387 return cpu_to_le32(csum);
1390 static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors,
1392 static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
1394 struct mdp_superblock_1 *sb;
1398 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1402 * Calculate the position of the superblock in 512byte sectors.
1403 * It is always aligned to a 4K boundary and
1404 * depeding on minor_version, it can be:
1405 * 0: At least 8K, but less than 12K, from end of device
1406 * 1: At start of device
1407 * 2: 4K from start of device.
1409 switch(minor_version) {
1411 sb_start = i_size_read(rdev->bdev->bd_inode) >> 9;
1413 sb_start &= ~(sector_t)(4*2-1);
1424 rdev->sb_start = sb_start;
1426 /* superblock is rarely larger than 1K, but it can be larger,
1427 * and it is safe to read 4k, so we do that
1429 ret = read_disk_sb(rdev, 4096);
1430 if (ret) return ret;
1432 sb = page_address(rdev->sb_page);
1434 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1435 sb->major_version != cpu_to_le32(1) ||
1436 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1437 le64_to_cpu(sb->super_offset) != rdev->sb_start ||
1438 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1441 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1442 printk("md: invalid superblock checksum on %s\n",
1443 bdevname(rdev->bdev,b));
1446 if (le64_to_cpu(sb->data_size) < 10) {
1447 printk("md: data_size too small on %s\n",
1448 bdevname(rdev->bdev,b));
1453 memcmp(sb->pad3, sb->pad3+1, sizeof(sb->pad3) - sizeof(sb->pad3[1])))
1454 /* Some padding is non-zero, might be a new feature */
1457 rdev->preferred_minor = 0xffff;
1458 rdev->data_offset = le64_to_cpu(sb->data_offset);
1459 rdev->new_data_offset = rdev->data_offset;
1460 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE) &&
1461 (le32_to_cpu(sb->feature_map) & MD_FEATURE_NEW_OFFSET))
1462 rdev->new_data_offset += (s32)le32_to_cpu(sb->new_offset);
1463 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1465 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1466 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1467 if (rdev->sb_size & bmask)
1468 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1471 && rdev->data_offset < sb_start + (rdev->sb_size/512))
1474 && rdev->new_data_offset < sb_start + (rdev->sb_size/512))
1477 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1480 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1482 if (!rdev->bb_page) {
1483 rdev->bb_page = alloc_page(GFP_KERNEL);
1487 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BAD_BLOCKS) &&
1488 rdev->badblocks.count == 0) {
1489 /* need to load the bad block list.
1490 * Currently we limit it to one page.
1496 int sectors = le16_to_cpu(sb->bblog_size);
1497 if (sectors > (PAGE_SIZE / 512))
1499 offset = le32_to_cpu(sb->bblog_offset);
1502 bb_sector = (long long)offset;
1503 if (!sync_page_io(rdev, bb_sector, sectors << 9,
1504 rdev->bb_page, READ, true))
1506 bbp = (u64 *)page_address(rdev->bb_page);
1507 rdev->badblocks.shift = sb->bblog_shift;
1508 for (i = 0 ; i < (sectors << (9-3)) ; i++, bbp++) {
1509 u64 bb = le64_to_cpu(*bbp);
1510 int count = bb & (0x3ff);
1511 u64 sector = bb >> 10;
1512 sector <<= sb->bblog_shift;
1513 count <<= sb->bblog_shift;
1516 if (md_set_badblocks(&rdev->badblocks,
1517 sector, count, 1) == 0)
1520 } else if (sb->bblog_offset != 0)
1521 rdev->badblocks.shift = 0;
1527 struct mdp_superblock_1 *refsb = page_address(refdev->sb_page);
1529 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1530 sb->level != refsb->level ||
1531 sb->layout != refsb->layout ||
1532 sb->chunksize != refsb->chunksize) {
1533 printk(KERN_WARNING "md: %s has strangely different"
1534 " superblock to %s\n",
1535 bdevname(rdev->bdev,b),
1536 bdevname(refdev->bdev,b2));
1539 ev1 = le64_to_cpu(sb->events);
1540 ev2 = le64_to_cpu(refsb->events);
1547 if (minor_version) {
1548 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9);
1549 sectors -= rdev->data_offset;
1551 sectors = rdev->sb_start;
1552 if (sectors < le64_to_cpu(sb->data_size))
1554 rdev->sectors = le64_to_cpu(sb->data_size);
1558 static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev)
1560 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
1561 __u64 ev1 = le64_to_cpu(sb->events);
1563 rdev->raid_disk = -1;
1564 clear_bit(Faulty, &rdev->flags);
1565 clear_bit(In_sync, &rdev->flags);
1566 clear_bit(Bitmap_sync, &rdev->flags);
1567 clear_bit(WriteMostly, &rdev->flags);
1569 if (mddev->raid_disks == 0) {
1570 mddev->major_version = 1;
1571 mddev->patch_version = 0;
1572 mddev->external = 0;
1573 mddev->chunk_sectors = le32_to_cpu(sb->chunksize);
1574 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1575 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1576 mddev->level = le32_to_cpu(sb->level);
1577 mddev->clevel[0] = 0;
1578 mddev->layout = le32_to_cpu(sb->layout);
1579 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1580 mddev->dev_sectors = le64_to_cpu(sb->size);
1581 mddev->events = ev1;
1582 mddev->bitmap_info.offset = 0;
1583 mddev->bitmap_info.space = 0;
1584 /* Default location for bitmap is 1K after superblock
1585 * using 3K - total of 4K
1587 mddev->bitmap_info.default_offset = 1024 >> 9;
1588 mddev->bitmap_info.default_space = (4096-1024) >> 9;
1589 mddev->reshape_backwards = 0;
1591 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1592 memcpy(mddev->uuid, sb->set_uuid, 16);
1594 mddev->max_disks = (4096-256)/2;
1596 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1597 mddev->bitmap_info.file == NULL) {
1598 mddev->bitmap_info.offset =
1599 (__s32)le32_to_cpu(sb->bitmap_offset);
1600 /* Metadata doesn't record how much space is available.
1601 * For 1.0, we assume we can use up to the superblock
1602 * if before, else to 4K beyond superblock.
1603 * For others, assume no change is possible.
1605 if (mddev->minor_version > 0)
1606 mddev->bitmap_info.space = 0;
1607 else if (mddev->bitmap_info.offset > 0)
1608 mddev->bitmap_info.space =
1609 8 - mddev->bitmap_info.offset;
1611 mddev->bitmap_info.space =
1612 -mddev->bitmap_info.offset;
1615 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1616 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1617 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1618 mddev->new_level = le32_to_cpu(sb->new_level);
1619 mddev->new_layout = le32_to_cpu(sb->new_layout);
1620 mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk);
1621 if (mddev->delta_disks < 0 ||
1622 (mddev->delta_disks == 0 &&
1623 (le32_to_cpu(sb->feature_map)
1624 & MD_FEATURE_RESHAPE_BACKWARDS)))
1625 mddev->reshape_backwards = 1;
1627 mddev->reshape_position = MaxSector;
1628 mddev->delta_disks = 0;
1629 mddev->new_level = mddev->level;
1630 mddev->new_layout = mddev->layout;
1631 mddev->new_chunk_sectors = mddev->chunk_sectors;
1634 } else if (mddev->pers == NULL) {
1635 /* Insist of good event counter while assembling, except for
1636 * spares (which don't need an event count) */
1638 if (rdev->desc_nr >= 0 &&
1639 rdev->desc_nr < le32_to_cpu(sb->max_dev) &&
1640 le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < 0xfffe)
1641 if (ev1 < mddev->events)
1643 } else if (mddev->bitmap) {
1644 /* If adding to array with a bitmap, then we can accept an
1645 * older device, but not too old.
1647 if (ev1 < mddev->bitmap->events_cleared)
1649 if (ev1 < mddev->events)
1650 set_bit(Bitmap_sync, &rdev->flags);
1652 if (ev1 < mddev->events)
1653 /* just a hot-add of a new device, leave raid_disk at -1 */
1656 if (mddev->level != LEVEL_MULTIPATH) {
1658 if (rdev->desc_nr < 0 ||
1659 rdev->desc_nr >= le32_to_cpu(sb->max_dev)) {
1663 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1665 case 0xffff: /* spare */
1667 case 0xfffe: /* faulty */
1668 set_bit(Faulty, &rdev->flags);
1671 rdev->saved_raid_disk = role;
1672 if ((le32_to_cpu(sb->feature_map) &
1673 MD_FEATURE_RECOVERY_OFFSET)) {
1674 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1675 if (!(le32_to_cpu(sb->feature_map) &
1676 MD_FEATURE_RECOVERY_BITMAP))
1677 rdev->saved_raid_disk = -1;
1679 set_bit(In_sync, &rdev->flags);
1680 rdev->raid_disk = role;
1683 if (sb->devflags & WriteMostly1)
1684 set_bit(WriteMostly, &rdev->flags);
1685 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_REPLACEMENT)
1686 set_bit(Replacement, &rdev->flags);
1687 } else /* MULTIPATH are always insync */
1688 set_bit(In_sync, &rdev->flags);
1693 static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev)
1695 struct mdp_superblock_1 *sb;
1696 struct md_rdev *rdev2;
1698 /* make rdev->sb match mddev and rdev data. */
1700 sb = page_address(rdev->sb_page);
1702 sb->feature_map = 0;
1704 sb->recovery_offset = cpu_to_le64(0);
1705 memset(sb->pad3, 0, sizeof(sb->pad3));
1707 sb->utime = cpu_to_le64((__u64)mddev->utime);
1708 sb->events = cpu_to_le64(mddev->events);
1710 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1712 sb->resync_offset = cpu_to_le64(0);
1714 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
1716 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
1717 sb->size = cpu_to_le64(mddev->dev_sectors);
1718 sb->chunksize = cpu_to_le32(mddev->chunk_sectors);
1719 sb->level = cpu_to_le32(mddev->level);
1720 sb->layout = cpu_to_le32(mddev->layout);
1722 if (test_bit(WriteMostly, &rdev->flags))
1723 sb->devflags |= WriteMostly1;
1725 sb->devflags &= ~WriteMostly1;
1726 sb->data_offset = cpu_to_le64(rdev->data_offset);
1727 sb->data_size = cpu_to_le64(rdev->sectors);
1729 if (mddev->bitmap && mddev->bitmap_info.file == NULL) {
1730 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset);
1731 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
1734 if (rdev->raid_disk >= 0 &&
1735 !test_bit(In_sync, &rdev->flags)) {
1737 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1738 sb->recovery_offset =
1739 cpu_to_le64(rdev->recovery_offset);
1740 if (rdev->saved_raid_disk >= 0 && mddev->bitmap)
1742 cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP);
1744 if (test_bit(Replacement, &rdev->flags))
1746 cpu_to_le32(MD_FEATURE_REPLACEMENT);
1748 if (mddev->reshape_position != MaxSector) {
1749 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1750 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1751 sb->new_layout = cpu_to_le32(mddev->new_layout);
1752 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1753 sb->new_level = cpu_to_le32(mddev->new_level);
1754 sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors);
1755 if (mddev->delta_disks == 0 &&
1756 mddev->reshape_backwards)
1758 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS);
1759 if (rdev->new_data_offset != rdev->data_offset) {
1761 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET);
1762 sb->new_offset = cpu_to_le32((__u32)(rdev->new_data_offset
1763 - rdev->data_offset));
1767 if (rdev->badblocks.count == 0)
1768 /* Nothing to do for bad blocks*/ ;
1769 else if (sb->bblog_offset == 0)
1770 /* Cannot record bad blocks on this device */
1771 md_error(mddev, rdev);
1773 struct badblocks *bb = &rdev->badblocks;
1774 u64 *bbp = (u64 *)page_address(rdev->bb_page);
1776 sb->feature_map |= cpu_to_le32(MD_FEATURE_BAD_BLOCKS);
1781 seq = read_seqbegin(&bb->lock);
1783 memset(bbp, 0xff, PAGE_SIZE);
1785 for (i = 0 ; i < bb->count ; i++) {
1786 u64 internal_bb = p[i];
1787 u64 store_bb = ((BB_OFFSET(internal_bb) << 10)
1788 | BB_LEN(internal_bb));
1789 bbp[i] = cpu_to_le64(store_bb);
1792 if (read_seqretry(&bb->lock, seq))
1795 bb->sector = (rdev->sb_start +
1796 (int)le32_to_cpu(sb->bblog_offset));
1797 bb->size = le16_to_cpu(sb->bblog_size);
1802 rdev_for_each(rdev2, mddev)
1803 if (rdev2->desc_nr+1 > max_dev)
1804 max_dev = rdev2->desc_nr+1;
1806 if (max_dev > le32_to_cpu(sb->max_dev)) {
1808 sb->max_dev = cpu_to_le32(max_dev);
1809 rdev->sb_size = max_dev * 2 + 256;
1810 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1811 if (rdev->sb_size & bmask)
1812 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1814 max_dev = le32_to_cpu(sb->max_dev);
1816 for (i=0; i<max_dev;i++)
1817 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1819 rdev_for_each(rdev2, mddev) {
1821 if (test_bit(Faulty, &rdev2->flags))
1822 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1823 else if (test_bit(In_sync, &rdev2->flags))
1824 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1825 else if (rdev2->raid_disk >= 0)
1826 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1828 sb->dev_roles[i] = cpu_to_le16(0xffff);
1831 sb->sb_csum = calc_sb_1_csum(sb);
1834 static unsigned long long
1835 super_1_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
1837 struct mdp_superblock_1 *sb;
1838 sector_t max_sectors;
1839 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1840 return 0; /* component must fit device */
1841 if (rdev->data_offset != rdev->new_data_offset)
1842 return 0; /* too confusing */
1843 if (rdev->sb_start < rdev->data_offset) {
1844 /* minor versions 1 and 2; superblock before data */
1845 max_sectors = i_size_read(rdev->bdev->bd_inode) >> 9;
1846 max_sectors -= rdev->data_offset;
1847 if (!num_sectors || num_sectors > max_sectors)
1848 num_sectors = max_sectors;
1849 } else if (rdev->mddev->bitmap_info.offset) {
1850 /* minor version 0 with bitmap we can't move */
1853 /* minor version 0; superblock after data */
1855 sb_start = (i_size_read(rdev->bdev->bd_inode) >> 9) - 8*2;
1856 sb_start &= ~(sector_t)(4*2 - 1);
1857 max_sectors = rdev->sectors + sb_start - rdev->sb_start;
1858 if (!num_sectors || num_sectors > max_sectors)
1859 num_sectors = max_sectors;
1860 rdev->sb_start = sb_start;
1862 sb = page_address(rdev->sb_page);
1863 sb->data_size = cpu_to_le64(num_sectors);
1864 sb->super_offset = rdev->sb_start;
1865 sb->sb_csum = calc_sb_1_csum(sb);
1866 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1868 md_super_wait(rdev->mddev);
1874 super_1_allow_new_offset(struct md_rdev *rdev,
1875 unsigned long long new_offset)
1877 /* All necessary checks on new >= old have been done */
1878 struct bitmap *bitmap;
1879 if (new_offset >= rdev->data_offset)
1882 /* with 1.0 metadata, there is no metadata to tread on
1883 * so we can always move back */
1884 if (rdev->mddev->minor_version == 0)
1887 /* otherwise we must be sure not to step on
1888 * any metadata, so stay:
1889 * 36K beyond start of superblock
1890 * beyond end of badblocks
1891 * beyond write-intent bitmap
1893 if (rdev->sb_start + (32+4)*2 > new_offset)
1895 bitmap = rdev->mddev->bitmap;
1896 if (bitmap && !rdev->mddev->bitmap_info.file &&
1897 rdev->sb_start + rdev->mddev->bitmap_info.offset +
1898 bitmap->storage.file_pages * (PAGE_SIZE>>9) > new_offset)
1900 if (rdev->badblocks.sector + rdev->badblocks.size > new_offset)
1906 static struct super_type super_types[] = {
1909 .owner = THIS_MODULE,
1910 .load_super = super_90_load,
1911 .validate_super = super_90_validate,
1912 .sync_super = super_90_sync,
1913 .rdev_size_change = super_90_rdev_size_change,
1914 .allow_new_offset = super_90_allow_new_offset,
1918 .owner = THIS_MODULE,
1919 .load_super = super_1_load,
1920 .validate_super = super_1_validate,
1921 .sync_super = super_1_sync,
1922 .rdev_size_change = super_1_rdev_size_change,
1923 .allow_new_offset = super_1_allow_new_offset,
1927 static void sync_super(struct mddev *mddev, struct md_rdev *rdev)
1929 if (mddev->sync_super) {
1930 mddev->sync_super(mddev, rdev);
1934 BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types));
1936 super_types[mddev->major_version].sync_super(mddev, rdev);
1939 static int match_mddev_units(struct mddev *mddev1, struct mddev *mddev2)
1941 struct md_rdev *rdev, *rdev2;
1944 rdev_for_each_rcu(rdev, mddev1)
1945 rdev_for_each_rcu(rdev2, mddev2)
1946 if (rdev->bdev->bd_contains ==
1947 rdev2->bdev->bd_contains) {
1955 static LIST_HEAD(pending_raid_disks);
1958 * Try to register data integrity profile for an mddev
1960 * This is called when an array is started and after a disk has been kicked
1961 * from the array. It only succeeds if all working and active component devices
1962 * are integrity capable with matching profiles.
1964 int md_integrity_register(struct mddev *mddev)
1966 struct md_rdev *rdev, *reference = NULL;
1968 if (list_empty(&mddev->disks))
1969 return 0; /* nothing to do */
1970 if (!mddev->gendisk || blk_get_integrity(mddev->gendisk))
1971 return 0; /* shouldn't register, or already is */
1972 rdev_for_each(rdev, mddev) {
1973 /* skip spares and non-functional disks */
1974 if (test_bit(Faulty, &rdev->flags))
1976 if (rdev->raid_disk < 0)
1979 /* Use the first rdev as the reference */
1983 /* does this rdev's profile match the reference profile? */
1984 if (blk_integrity_compare(reference->bdev->bd_disk,
1985 rdev->bdev->bd_disk) < 0)
1988 if (!reference || !bdev_get_integrity(reference->bdev))
1991 * All component devices are integrity capable and have matching
1992 * profiles, register the common profile for the md device.
1994 if (blk_integrity_register(mddev->gendisk,
1995 bdev_get_integrity(reference->bdev)) != 0) {
1996 printk(KERN_ERR "md: failed to register integrity for %s\n",
2000 printk(KERN_NOTICE "md: data integrity enabled on %s\n", mdname(mddev));
2001 if (bioset_integrity_create(mddev->bio_set, BIO_POOL_SIZE)) {
2002 printk(KERN_ERR "md: failed to create integrity pool for %s\n",
2008 EXPORT_SYMBOL(md_integrity_register);
2010 /* Disable data integrity if non-capable/non-matching disk is being added */
2011 void md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev)
2013 struct blk_integrity *bi_rdev;
2014 struct blk_integrity *bi_mddev;
2016 if (!mddev->gendisk)
2019 bi_rdev = bdev_get_integrity(rdev->bdev);
2020 bi_mddev = blk_get_integrity(mddev->gendisk);
2022 if (!bi_mddev) /* nothing to do */
2024 if (rdev->raid_disk < 0) /* skip spares */
2026 if (bi_rdev && blk_integrity_compare(mddev->gendisk,
2027 rdev->bdev->bd_disk) >= 0)
2029 printk(KERN_NOTICE "disabling data integrity on %s\n", mdname(mddev));
2030 blk_integrity_unregister(mddev->gendisk);
2032 EXPORT_SYMBOL(md_integrity_add_rdev);
2034 static int bind_rdev_to_array(struct md_rdev *rdev, struct mddev *mddev)
2036 char b[BDEVNAME_SIZE];
2041 /* prevent duplicates */
2042 if (find_rdev(mddev, rdev->bdev->bd_dev))
2045 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2046 if (rdev->sectors && (mddev->dev_sectors == 0 ||
2047 rdev->sectors < mddev->dev_sectors)) {
2049 /* Cannot change size, so fail
2050 * If mddev->level <= 0, then we don't care
2051 * about aligning sizes (e.g. linear)
2053 if (mddev->level > 0)
2056 mddev->dev_sectors = rdev->sectors;
2059 /* Verify rdev->desc_nr is unique.
2060 * If it is -1, assign a free number, else
2061 * check number is not in use
2064 if (rdev->desc_nr < 0) {
2067 choice = mddev->raid_disks;
2068 while (find_rdev_nr_rcu(mddev, choice))
2070 rdev->desc_nr = choice;
2072 if (find_rdev_nr_rcu(mddev, rdev->desc_nr)) {
2078 if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) {
2079 printk(KERN_WARNING "md: %s: array is limited to %d devices\n",
2080 mdname(mddev), mddev->max_disks);
2083 bdevname(rdev->bdev,b);
2084 while ( (s=strchr(b, '/')) != NULL)
2087 rdev->mddev = mddev;
2088 printk(KERN_INFO "md: bind<%s>\n", b);
2090 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
2093 ko = &part_to_dev(rdev->bdev->bd_part)->kobj;
2094 if (sysfs_create_link(&rdev->kobj, ko, "block"))
2095 /* failure here is OK */;
2096 rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state");
2098 list_add_rcu(&rdev->same_set, &mddev->disks);
2099 bd_link_disk_holder(rdev->bdev, mddev->gendisk);
2101 /* May as well allow recovery to be retried once */
2102 mddev->recovery_disabled++;
2107 printk(KERN_WARNING "md: failed to register dev-%s for %s\n",
2112 static void md_delayed_delete(struct work_struct *ws)
2114 struct md_rdev *rdev = container_of(ws, struct md_rdev, del_work);
2115 kobject_del(&rdev->kobj);
2116 kobject_put(&rdev->kobj);
2119 static void unbind_rdev_from_array(struct md_rdev *rdev)
2121 char b[BDEVNAME_SIZE];
2123 bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk);
2124 list_del_rcu(&rdev->same_set);
2125 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
2127 sysfs_remove_link(&rdev->kobj, "block");
2128 sysfs_put(rdev->sysfs_state);
2129 rdev->sysfs_state = NULL;
2130 rdev->badblocks.count = 0;
2131 /* We need to delay this, otherwise we can deadlock when
2132 * writing to 'remove' to "dev/state". We also need
2133 * to delay it due to rcu usage.
2136 INIT_WORK(&rdev->del_work, md_delayed_delete);
2137 kobject_get(&rdev->kobj);
2138 queue_work(md_misc_wq, &rdev->del_work);
2142 * prevent the device from being mounted, repartitioned or
2143 * otherwise reused by a RAID array (or any other kernel
2144 * subsystem), by bd_claiming the device.
2146 static int lock_rdev(struct md_rdev *rdev, dev_t dev, int shared)
2149 struct block_device *bdev;
2150 char b[BDEVNAME_SIZE];
2152 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
2153 shared ? (struct md_rdev *)lock_rdev : rdev);
2155 printk(KERN_ERR "md: could not open %s.\n",
2156 __bdevname(dev, b));
2157 return PTR_ERR(bdev);
2163 static void unlock_rdev(struct md_rdev *rdev)
2165 struct block_device *bdev = rdev->bdev;
2167 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
2170 void md_autodetect_dev(dev_t dev);
2172 static void export_rdev(struct md_rdev *rdev)
2174 char b[BDEVNAME_SIZE];
2176 printk(KERN_INFO "md: export_rdev(%s)\n",
2177 bdevname(rdev->bdev,b));
2178 md_rdev_clear(rdev);
2180 if (test_bit(AutoDetected, &rdev->flags))
2181 md_autodetect_dev(rdev->bdev->bd_dev);
2184 kobject_put(&rdev->kobj);
2187 static void kick_rdev_from_array(struct md_rdev *rdev)
2189 unbind_rdev_from_array(rdev);
2193 static void export_array(struct mddev *mddev)
2195 struct md_rdev *rdev;
2197 while (!list_empty(&mddev->disks)) {
2198 rdev = list_first_entry(&mddev->disks, struct md_rdev,
2200 kick_rdev_from_array(rdev);
2202 mddev->raid_disks = 0;
2203 mddev->major_version = 0;
2206 static void sync_sbs(struct mddev *mddev, int nospares)
2208 /* Update each superblock (in-memory image), but
2209 * if we are allowed to, skip spares which already
2210 * have the right event counter, or have one earlier
2211 * (which would mean they aren't being marked as dirty
2212 * with the rest of the array)
2214 struct md_rdev *rdev;
2215 rdev_for_each(rdev, mddev) {
2216 if (rdev->sb_events == mddev->events ||
2218 rdev->raid_disk < 0 &&
2219 rdev->sb_events+1 == mddev->events)) {
2220 /* Don't update this superblock */
2221 rdev->sb_loaded = 2;
2223 sync_super(mddev, rdev);
2224 rdev->sb_loaded = 1;
2229 static void md_update_sb(struct mddev *mddev, int force_change)
2231 struct md_rdev *rdev;
2234 int any_badblocks_changed = 0;
2238 set_bit(MD_CHANGE_DEVS, &mddev->flags);
2242 /* First make sure individual recovery_offsets are correct */
2243 rdev_for_each(rdev, mddev) {
2244 if (rdev->raid_disk >= 0 &&
2245 mddev->delta_disks >= 0 &&
2246 !test_bit(In_sync, &rdev->flags) &&
2247 mddev->curr_resync_completed > rdev->recovery_offset)
2248 rdev->recovery_offset = mddev->curr_resync_completed;
2251 if (!mddev->persistent) {
2252 clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
2253 clear_bit(MD_CHANGE_DEVS, &mddev->flags);
2254 if (!mddev->external) {
2255 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2256 rdev_for_each(rdev, mddev) {
2257 if (rdev->badblocks.changed) {
2258 rdev->badblocks.changed = 0;
2259 md_ack_all_badblocks(&rdev->badblocks);
2260 md_error(mddev, rdev);
2262 clear_bit(Blocked, &rdev->flags);
2263 clear_bit(BlockedBadBlocks, &rdev->flags);
2264 wake_up(&rdev->blocked_wait);
2267 wake_up(&mddev->sb_wait);
2271 spin_lock(&mddev->lock);
2273 mddev->utime = get_seconds();
2275 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
2277 if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags))
2278 /* just a clean<-> dirty transition, possibly leave spares alone,
2279 * though if events isn't the right even/odd, we will have to do
2285 if (mddev->degraded)
2286 /* If the array is degraded, then skipping spares is both
2287 * dangerous and fairly pointless.
2288 * Dangerous because a device that was removed from the array
2289 * might have a event_count that still looks up-to-date,
2290 * so it can be re-added without a resync.
2291 * Pointless because if there are any spares to skip,
2292 * then a recovery will happen and soon that array won't
2293 * be degraded any more and the spare can go back to sleep then.
2297 sync_req = mddev->in_sync;
2299 /* If this is just a dirty<->clean transition, and the array is clean
2300 * and 'events' is odd, we can roll back to the previous clean state */
2302 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
2303 && mddev->can_decrease_events
2304 && mddev->events != 1) {
2306 mddev->can_decrease_events = 0;
2308 /* otherwise we have to go forward and ... */
2310 mddev->can_decrease_events = nospares;
2314 * This 64-bit counter should never wrap.
2315 * Either we are in around ~1 trillion A.C., assuming
2316 * 1 reboot per second, or we have a bug...
2318 WARN_ON(mddev->events == 0);
2320 rdev_for_each(rdev, mddev) {
2321 if (rdev->badblocks.changed)
2322 any_badblocks_changed++;
2323 if (test_bit(Faulty, &rdev->flags))
2324 set_bit(FaultRecorded, &rdev->flags);
2327 sync_sbs(mddev, nospares);
2328 spin_unlock(&mddev->lock);
2330 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2331 mdname(mddev), mddev->in_sync);
2333 bitmap_update_sb(mddev->bitmap);
2334 rdev_for_each(rdev, mddev) {
2335 char b[BDEVNAME_SIZE];
2337 if (rdev->sb_loaded != 1)
2338 continue; /* no noise on spare devices */
2340 if (!test_bit(Faulty, &rdev->flags)) {
2341 md_super_write(mddev,rdev,
2342 rdev->sb_start, rdev->sb_size,
2344 pr_debug("md: (write) %s's sb offset: %llu\n",
2345 bdevname(rdev->bdev, b),
2346 (unsigned long long)rdev->sb_start);
2347 rdev->sb_events = mddev->events;
2348 if (rdev->badblocks.size) {
2349 md_super_write(mddev, rdev,
2350 rdev->badblocks.sector,
2351 rdev->badblocks.size << 9,
2353 rdev->badblocks.size = 0;
2357 pr_debug("md: %s (skipping faulty)\n",
2358 bdevname(rdev->bdev, b));
2360 if (mddev->level == LEVEL_MULTIPATH)
2361 /* only need to write one superblock... */
2364 md_super_wait(mddev);
2365 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2367 spin_lock(&mddev->lock);
2368 if (mddev->in_sync != sync_req ||
2369 test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
2370 /* have to write it out again */
2371 spin_unlock(&mddev->lock);
2374 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2375 spin_unlock(&mddev->lock);
2376 wake_up(&mddev->sb_wait);
2377 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
2378 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
2380 rdev_for_each(rdev, mddev) {
2381 if (test_and_clear_bit(FaultRecorded, &rdev->flags))
2382 clear_bit(Blocked, &rdev->flags);
2384 if (any_badblocks_changed)
2385 md_ack_all_badblocks(&rdev->badblocks);
2386 clear_bit(BlockedBadBlocks, &rdev->flags);
2387 wake_up(&rdev->blocked_wait);
2391 /* words written to sysfs files may, or may not, be \n terminated.
2392 * We want to accept with case. For this we use cmd_match.
2394 static int cmd_match(const char *cmd, const char *str)
2396 /* See if cmd, written into a sysfs file, matches
2397 * str. They must either be the same, or cmd can
2398 * have a trailing newline
2400 while (*cmd && *str && *cmd == *str) {
2411 struct rdev_sysfs_entry {
2412 struct attribute attr;
2413 ssize_t (*show)(struct md_rdev *, char *);
2414 ssize_t (*store)(struct md_rdev *, const char *, size_t);
2418 state_show(struct md_rdev *rdev, char *page)
2422 unsigned long flags = ACCESS_ONCE(rdev->flags);
2424 if (test_bit(Faulty, &flags) ||
2425 rdev->badblocks.unacked_exist) {
2426 len+= sprintf(page+len, "%sfaulty",sep);
2429 if (test_bit(In_sync, &flags)) {
2430 len += sprintf(page+len, "%sin_sync",sep);
2433 if (test_bit(WriteMostly, &flags)) {
2434 len += sprintf(page+len, "%swrite_mostly",sep);
2437 if (test_bit(Blocked, &flags) ||
2438 (rdev->badblocks.unacked_exist
2439 && !test_bit(Faulty, &flags))) {
2440 len += sprintf(page+len, "%sblocked", sep);
2443 if (!test_bit(Faulty, &flags) &&
2444 !test_bit(In_sync, &flags)) {
2445 len += sprintf(page+len, "%sspare", sep);
2448 if (test_bit(WriteErrorSeen, &flags)) {
2449 len += sprintf(page+len, "%swrite_error", sep);
2452 if (test_bit(WantReplacement, &flags)) {
2453 len += sprintf(page+len, "%swant_replacement", sep);
2456 if (test_bit(Replacement, &flags)) {
2457 len += sprintf(page+len, "%sreplacement", sep);
2461 return len+sprintf(page+len, "\n");
2465 state_store(struct md_rdev *rdev, const char *buf, size_t len)
2468 * faulty - simulates an error
2469 * remove - disconnects the device
2470 * writemostly - sets write_mostly
2471 * -writemostly - clears write_mostly
2472 * blocked - sets the Blocked flags
2473 * -blocked - clears the Blocked and possibly simulates an error
2474 * insync - sets Insync providing device isn't active
2475 * -insync - clear Insync for a device with a slot assigned,
2476 * so that it gets rebuilt based on bitmap
2477 * write_error - sets WriteErrorSeen
2478 * -write_error - clears WriteErrorSeen
2481 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
2482 md_error(rdev->mddev, rdev);
2483 if (test_bit(Faulty, &rdev->flags))
2487 } else if (cmd_match(buf, "remove")) {
2488 if (rdev->raid_disk >= 0)
2491 struct mddev *mddev = rdev->mddev;
2492 kick_rdev_from_array(rdev);
2494 md_update_sb(mddev, 1);
2495 md_new_event(mddev);
2498 } else if (cmd_match(buf, "writemostly")) {
2499 set_bit(WriteMostly, &rdev->flags);
2501 } else if (cmd_match(buf, "-writemostly")) {
2502 clear_bit(WriteMostly, &rdev->flags);
2504 } else if (cmd_match(buf, "blocked")) {
2505 set_bit(Blocked, &rdev->flags);
2507 } else if (cmd_match(buf, "-blocked")) {
2508 if (!test_bit(Faulty, &rdev->flags) &&
2509 rdev->badblocks.unacked_exist) {
2510 /* metadata handler doesn't understand badblocks,
2511 * so we need to fail the device
2513 md_error(rdev->mddev, rdev);
2515 clear_bit(Blocked, &rdev->flags);
2516 clear_bit(BlockedBadBlocks, &rdev->flags);
2517 wake_up(&rdev->blocked_wait);
2518 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2519 md_wakeup_thread(rdev->mddev->thread);
2522 } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) {
2523 set_bit(In_sync, &rdev->flags);
2525 } else if (cmd_match(buf, "-insync") && rdev->raid_disk >= 0) {
2526 if (rdev->mddev->pers == NULL) {
2527 clear_bit(In_sync, &rdev->flags);
2528 rdev->saved_raid_disk = rdev->raid_disk;
2529 rdev->raid_disk = -1;
2532 } else if (cmd_match(buf, "write_error")) {
2533 set_bit(WriteErrorSeen, &rdev->flags);
2535 } else if (cmd_match(buf, "-write_error")) {
2536 clear_bit(WriteErrorSeen, &rdev->flags);
2538 } else if (cmd_match(buf, "want_replacement")) {
2539 /* Any non-spare device that is not a replacement can
2540 * become want_replacement at any time, but we then need to
2541 * check if recovery is needed.
2543 if (rdev->raid_disk >= 0 &&
2544 !test_bit(Replacement, &rdev->flags))
2545 set_bit(WantReplacement, &rdev->flags);
2546 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2547 md_wakeup_thread(rdev->mddev->thread);
2549 } else if (cmd_match(buf, "-want_replacement")) {
2550 /* Clearing 'want_replacement' is always allowed.
2551 * Once replacements starts it is too late though.
2554 clear_bit(WantReplacement, &rdev->flags);
2555 } else if (cmd_match(buf, "replacement")) {
2556 /* Can only set a device as a replacement when array has not
2557 * yet been started. Once running, replacement is automatic
2558 * from spares, or by assigning 'slot'.
2560 if (rdev->mddev->pers)
2563 set_bit(Replacement, &rdev->flags);
2566 } else if (cmd_match(buf, "-replacement")) {
2567 /* Similarly, can only clear Replacement before start */
2568 if (rdev->mddev->pers)
2571 clear_bit(Replacement, &rdev->flags);
2576 sysfs_notify_dirent_safe(rdev->sysfs_state);
2577 return err ? err : len;
2579 static struct rdev_sysfs_entry rdev_state =
2580 __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store);
2583 errors_show(struct md_rdev *rdev, char *page)
2585 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
2589 errors_store(struct md_rdev *rdev, const char *buf, size_t len)
2592 unsigned long n = simple_strtoul(buf, &e, 10);
2593 if (*buf && (*e == 0 || *e == '\n')) {
2594 atomic_set(&rdev->corrected_errors, n);
2599 static struct rdev_sysfs_entry rdev_errors =
2600 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
2603 slot_show(struct md_rdev *rdev, char *page)
2605 if (rdev->raid_disk < 0)
2606 return sprintf(page, "none\n");
2608 return sprintf(page, "%d\n", rdev->raid_disk);
2612 slot_store(struct md_rdev *rdev, const char *buf, size_t len)
2616 int slot = simple_strtoul(buf, &e, 10);
2617 if (strncmp(buf, "none", 4)==0)
2619 else if (e==buf || (*e && *e!= '\n'))
2621 if (rdev->mddev->pers && slot == -1) {
2622 /* Setting 'slot' on an active array requires also
2623 * updating the 'rd%d' link, and communicating
2624 * with the personality with ->hot_*_disk.
2625 * For now we only support removing
2626 * failed/spare devices. This normally happens automatically,
2627 * but not when the metadata is externally managed.
2629 if (rdev->raid_disk == -1)
2631 /* personality does all needed checks */
2632 if (rdev->mddev->pers->hot_remove_disk == NULL)
2634 clear_bit(Blocked, &rdev->flags);
2635 remove_and_add_spares(rdev->mddev, rdev);
2636 if (rdev->raid_disk >= 0)
2638 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2639 md_wakeup_thread(rdev->mddev->thread);
2640 } else if (rdev->mddev->pers) {
2641 /* Activating a spare .. or possibly reactivating
2642 * if we ever get bitmaps working here.
2645 if (rdev->raid_disk != -1)
2648 if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery))
2651 if (rdev->mddev->pers->hot_add_disk == NULL)
2654 if (slot >= rdev->mddev->raid_disks &&
2655 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
2658 rdev->raid_disk = slot;
2659 if (test_bit(In_sync, &rdev->flags))
2660 rdev->saved_raid_disk = slot;
2662 rdev->saved_raid_disk = -1;
2663 clear_bit(In_sync, &rdev->flags);
2664 clear_bit(Bitmap_sync, &rdev->flags);
2665 err = rdev->mddev->pers->
2666 hot_add_disk(rdev->mddev, rdev);
2668 rdev->raid_disk = -1;
2671 sysfs_notify_dirent_safe(rdev->sysfs_state);
2672 if (sysfs_link_rdev(rdev->mddev, rdev))
2673 /* failure here is OK */;
2674 /* don't wakeup anyone, leave that to userspace. */
2676 if (slot >= rdev->mddev->raid_disks &&
2677 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
2679 rdev->raid_disk = slot;
2680 /* assume it is working */
2681 clear_bit(Faulty, &rdev->flags);
2682 clear_bit(WriteMostly, &rdev->flags);
2683 set_bit(In_sync, &rdev->flags);
2684 sysfs_notify_dirent_safe(rdev->sysfs_state);
2689 static struct rdev_sysfs_entry rdev_slot =
2690 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
2693 offset_show(struct md_rdev *rdev, char *page)
2695 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
2699 offset_store(struct md_rdev *rdev, const char *buf, size_t len)
2701 unsigned long long offset;
2702 if (kstrtoull(buf, 10, &offset) < 0)
2704 if (rdev->mddev->pers && rdev->raid_disk >= 0)
2706 if (rdev->sectors && rdev->mddev->external)
2707 /* Must set offset before size, so overlap checks
2710 rdev->data_offset = offset;
2711 rdev->new_data_offset = offset;
2715 static struct rdev_sysfs_entry rdev_offset =
2716 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
2718 static ssize_t new_offset_show(struct md_rdev *rdev, char *page)
2720 return sprintf(page, "%llu\n",
2721 (unsigned long long)rdev->new_data_offset);
2724 static ssize_t new_offset_store(struct md_rdev *rdev,
2725 const char *buf, size_t len)
2727 unsigned long long new_offset;
2728 struct mddev *mddev = rdev->mddev;
2730 if (kstrtoull(buf, 10, &new_offset) < 0)
2733 if (mddev->sync_thread ||
2734 test_bit(MD_RECOVERY_RUNNING,&mddev->recovery))
2736 if (new_offset == rdev->data_offset)
2737 /* reset is always permitted */
2739 else if (new_offset > rdev->data_offset) {
2740 /* must not push array size beyond rdev_sectors */
2741 if (new_offset - rdev->data_offset
2742 + mddev->dev_sectors > rdev->sectors)
2745 /* Metadata worries about other space details. */
2747 /* decreasing the offset is inconsistent with a backwards
2750 if (new_offset < rdev->data_offset &&
2751 mddev->reshape_backwards)
2753 /* Increasing offset is inconsistent with forwards
2754 * reshape. reshape_direction should be set to
2755 * 'backwards' first.
2757 if (new_offset > rdev->data_offset &&
2758 !mddev->reshape_backwards)
2761 if (mddev->pers && mddev->persistent &&
2762 !super_types[mddev->major_version]
2763 .allow_new_offset(rdev, new_offset))
2765 rdev->new_data_offset = new_offset;
2766 if (new_offset > rdev->data_offset)
2767 mddev->reshape_backwards = 1;
2768 else if (new_offset < rdev->data_offset)
2769 mddev->reshape_backwards = 0;
2773 static struct rdev_sysfs_entry rdev_new_offset =
2774 __ATTR(new_offset, S_IRUGO|S_IWUSR, new_offset_show, new_offset_store);
2777 rdev_size_show(struct md_rdev *rdev, char *page)
2779 return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2);
2782 static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
2784 /* check if two start/length pairs overlap */
2792 static int strict_blocks_to_sectors(const char *buf, sector_t *sectors)
2794 unsigned long long blocks;
2797 if (kstrtoull(buf, 10, &blocks) < 0)
2800 if (blocks & 1ULL << (8 * sizeof(blocks) - 1))
2801 return -EINVAL; /* sector conversion overflow */
2804 if (new != blocks * 2)
2805 return -EINVAL; /* unsigned long long to sector_t overflow */
2812 rdev_size_store(struct md_rdev *rdev, const char *buf, size_t len)
2814 struct mddev *my_mddev = rdev->mddev;
2815 sector_t oldsectors = rdev->sectors;
2818 if (strict_blocks_to_sectors(buf, §ors) < 0)
2820 if (rdev->data_offset != rdev->new_data_offset)
2821 return -EINVAL; /* too confusing */
2822 if (my_mddev->pers && rdev->raid_disk >= 0) {
2823 if (my_mddev->persistent) {
2824 sectors = super_types[my_mddev->major_version].
2825 rdev_size_change(rdev, sectors);
2828 } else if (!sectors)
2829 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) -
2831 if (!my_mddev->pers->resize)
2832 /* Cannot change size for RAID0 or Linear etc */
2835 if (sectors < my_mddev->dev_sectors)
2836 return -EINVAL; /* component must fit device */
2838 rdev->sectors = sectors;
2839 if (sectors > oldsectors && my_mddev->external) {
2840 /* Need to check that all other rdevs with the same
2841 * ->bdev do not overlap. 'rcu' is sufficient to walk
2842 * the rdev lists safely.
2843 * This check does not provide a hard guarantee, it
2844 * just helps avoid dangerous mistakes.
2846 struct mddev *mddev;
2848 struct list_head *tmp;
2851 for_each_mddev(mddev, tmp) {
2852 struct md_rdev *rdev2;
2854 rdev_for_each(rdev2, mddev)
2855 if (rdev->bdev == rdev2->bdev &&
2857 overlaps(rdev->data_offset, rdev->sectors,
2870 /* Someone else could have slipped in a size
2871 * change here, but doing so is just silly.
2872 * We put oldsectors back because we *know* it is
2873 * safe, and trust userspace not to race with
2876 rdev->sectors = oldsectors;
2883 static struct rdev_sysfs_entry rdev_size =
2884 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
2886 static ssize_t recovery_start_show(struct md_rdev *rdev, char *page)
2888 unsigned long long recovery_start = rdev->recovery_offset;
2890 if (test_bit(In_sync, &rdev->flags) ||
2891 recovery_start == MaxSector)
2892 return sprintf(page, "none\n");
2894 return sprintf(page, "%llu\n", recovery_start);
2897 static ssize_t recovery_start_store(struct md_rdev *rdev, const char *buf, size_t len)
2899 unsigned long long recovery_start;
2901 if (cmd_match(buf, "none"))
2902 recovery_start = MaxSector;
2903 else if (kstrtoull(buf, 10, &recovery_start))
2906 if (rdev->mddev->pers &&
2907 rdev->raid_disk >= 0)
2910 rdev->recovery_offset = recovery_start;
2911 if (recovery_start == MaxSector)
2912 set_bit(In_sync, &rdev->flags);
2914 clear_bit(In_sync, &rdev->flags);
2918 static struct rdev_sysfs_entry rdev_recovery_start =
2919 __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store);
2922 badblocks_show(struct badblocks *bb, char *page, int unack);
2924 badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack);
2926 static ssize_t bb_show(struct md_rdev *rdev, char *page)
2928 return badblocks_show(&rdev->badblocks, page, 0);
2930 static ssize_t bb_store(struct md_rdev *rdev, const char *page, size_t len)
2932 int rv = badblocks_store(&rdev->badblocks, page, len, 0);
2933 /* Maybe that ack was all we needed */
2934 if (test_and_clear_bit(BlockedBadBlocks, &rdev->flags))
2935 wake_up(&rdev->blocked_wait);
2938 static struct rdev_sysfs_entry rdev_bad_blocks =
2939 __ATTR(bad_blocks, S_IRUGO|S_IWUSR, bb_show, bb_store);
2941 static ssize_t ubb_show(struct md_rdev *rdev, char *page)
2943 return badblocks_show(&rdev->badblocks, page, 1);
2945 static ssize_t ubb_store(struct md_rdev *rdev, const char *page, size_t len)
2947 return badblocks_store(&rdev->badblocks, page, len, 1);
2949 static struct rdev_sysfs_entry rdev_unack_bad_blocks =
2950 __ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store);
2952 static struct attribute *rdev_default_attrs[] = {
2957 &rdev_new_offset.attr,
2959 &rdev_recovery_start.attr,
2960 &rdev_bad_blocks.attr,
2961 &rdev_unack_bad_blocks.attr,
2965 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
2967 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2968 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
2974 return entry->show(rdev, page);
2978 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
2979 const char *page, size_t length)
2981 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2982 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
2984 struct mddev *mddev = rdev->mddev;
2988 if (!capable(CAP_SYS_ADMIN))
2990 rv = mddev ? mddev_lock(mddev): -EBUSY;
2992 if (rdev->mddev == NULL)
2995 rv = entry->store(rdev, page, length);
2996 mddev_unlock(mddev);
3001 static void rdev_free(struct kobject *ko)
3003 struct md_rdev *rdev = container_of(ko, struct md_rdev, kobj);
3006 static const struct sysfs_ops rdev_sysfs_ops = {
3007 .show = rdev_attr_show,
3008 .store = rdev_attr_store,
3010 static struct kobj_type rdev_ktype = {
3011 .release = rdev_free,
3012 .sysfs_ops = &rdev_sysfs_ops,
3013 .default_attrs = rdev_default_attrs,
3016 int md_rdev_init(struct md_rdev *rdev)
3019 rdev->saved_raid_disk = -1;
3020 rdev->raid_disk = -1;
3022 rdev->data_offset = 0;
3023 rdev->new_data_offset = 0;
3024 rdev->sb_events = 0;
3025 rdev->last_read_error.tv_sec = 0;
3026 rdev->last_read_error.tv_nsec = 0;
3027 rdev->sb_loaded = 0;
3028 rdev->bb_page = NULL;
3029 atomic_set(&rdev->nr_pending, 0);
3030 atomic_set(&rdev->read_errors, 0);
3031 atomic_set(&rdev->corrected_errors, 0);
3033 INIT_LIST_HEAD(&rdev->same_set);
3034 init_waitqueue_head(&rdev->blocked_wait);
3036 /* Add space to store bad block list.
3037 * This reserves the space even on arrays where it cannot
3038 * be used - I wonder if that matters
3040 rdev->badblocks.count = 0;
3041 rdev->badblocks.shift = -1; /* disabled until explicitly enabled */
3042 rdev->badblocks.page = kmalloc(PAGE_SIZE, GFP_KERNEL);
3043 seqlock_init(&rdev->badblocks.lock);
3044 if (rdev->badblocks.page == NULL)
3049 EXPORT_SYMBOL_GPL(md_rdev_init);
3051 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3053 * mark the device faulty if:
3055 * - the device is nonexistent (zero size)
3056 * - the device has no valid superblock
3058 * a faulty rdev _never_ has rdev->sb set.
3060 static struct md_rdev *md_import_device(dev_t newdev, int super_format, int super_minor)
3062 char b[BDEVNAME_SIZE];
3064 struct md_rdev *rdev;
3067 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
3069 printk(KERN_ERR "md: could not alloc mem for new device!\n");
3070 return ERR_PTR(-ENOMEM);
3073 err = md_rdev_init(rdev);
3076 err = alloc_disk_sb(rdev);
3080 err = lock_rdev(rdev, newdev, super_format == -2);
3084 kobject_init(&rdev->kobj, &rdev_ktype);
3086 size = i_size_read(rdev->bdev->bd_inode) >> BLOCK_SIZE_BITS;
3089 "md: %s has zero or unknown size, marking faulty!\n",
3090 bdevname(rdev->bdev,b));
3095 if (super_format >= 0) {
3096 err = super_types[super_format].
3097 load_super(rdev, NULL, super_minor);
3098 if (err == -EINVAL) {
3100 "md: %s does not have a valid v%d.%d "
3101 "superblock, not importing!\n",
3102 bdevname(rdev->bdev,b),
3103 super_format, super_minor);
3108 "md: could not read %s's sb, not importing!\n",
3109 bdevname(rdev->bdev,b));
3119 md_rdev_clear(rdev);
3121 return ERR_PTR(err);
3125 * Check a full RAID array for plausibility
3128 static void analyze_sbs(struct mddev *mddev)
3131 struct md_rdev *rdev, *freshest, *tmp;
3132 char b[BDEVNAME_SIZE];
3135 rdev_for_each_safe(rdev, tmp, mddev)
3136 switch (super_types[mddev->major_version].
3137 load_super(rdev, freshest, mddev->minor_version)) {
3145 "md: fatal superblock inconsistency in %s"
3146 " -- removing from array\n",
3147 bdevname(rdev->bdev,b));
3148 kick_rdev_from_array(rdev);
3151 super_types[mddev->major_version].
3152 validate_super(mddev, freshest);
3155 rdev_for_each_safe(rdev, tmp, mddev) {
3156 if (mddev->max_disks &&
3157 (rdev->desc_nr >= mddev->max_disks ||
3158 i > mddev->max_disks)) {
3160 "md: %s: %s: only %d devices permitted\n",
3161 mdname(mddev), bdevname(rdev->bdev, b),
3163 kick_rdev_from_array(rdev);
3166 if (rdev != freshest)
3167 if (super_types[mddev->major_version].
3168 validate_super(mddev, rdev)) {
3169 printk(KERN_WARNING "md: kicking non-fresh %s"
3171 bdevname(rdev->bdev,b));
3172 kick_rdev_from_array(rdev);
3175 if (mddev->level == LEVEL_MULTIPATH) {
3176 rdev->desc_nr = i++;
3177 rdev->raid_disk = rdev->desc_nr;
3178 set_bit(In_sync, &rdev->flags);
3179 } else if (rdev->raid_disk >= (mddev->raid_disks - min(0, mddev->delta_disks))) {
3180 rdev->raid_disk = -1;
3181 clear_bit(In_sync, &rdev->flags);
3186 /* Read a fixed-point number.
3187 * Numbers in sysfs attributes should be in "standard" units where
3188 * possible, so time should be in seconds.
3189 * However we internally use a a much smaller unit such as
3190 * milliseconds or jiffies.
3191 * This function takes a decimal number with a possible fractional
3192 * component, and produces an integer which is the result of
3193 * multiplying that number by 10^'scale'.
3194 * all without any floating-point arithmetic.
3196 int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale)
3198 unsigned long result = 0;
3200 while (isdigit(*cp) || (*cp == '.' && decimals < 0)) {
3203 else if (decimals < scale) {
3206 result = result * 10 + value;
3218 while (decimals < scale) {
3226 static void md_safemode_timeout(unsigned long data);
3229 safe_delay_show(struct mddev *mddev, char *page)
3231 int msec = (mddev->safemode_delay*1000)/HZ;
3232 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
3235 safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len)
3239 if (strict_strtoul_scaled(cbuf, &msec, 3) < 0)
3242 mddev->safemode_delay = 0;
3244 unsigned long old_delay = mddev->safemode_delay;
3245 mddev->safemode_delay = (msec*HZ)/1000;
3246 if (mddev->safemode_delay == 0)
3247 mddev->safemode_delay = 1;
3248 if (mddev->safemode_delay < old_delay || old_delay == 0)
3249 md_safemode_timeout((unsigned long)mddev);
3253 static struct md_sysfs_entry md_safe_delay =
3254 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
3257 level_show(struct mddev *mddev, char *page)
3259 struct md_personality *p;
3261 spin_lock(&mddev->lock);
3264 ret = sprintf(page, "%s\n", p->name);
3265 else if (mddev->clevel[0])
3266 ret = sprintf(page, "%s\n", mddev->clevel);
3267 else if (mddev->level != LEVEL_NONE)
3268 ret = sprintf(page, "%d\n", mddev->level);
3271 spin_unlock(&mddev->lock);
3276 level_store(struct mddev *mddev, const char *buf, size_t len)
3280 struct md_personality *pers, *oldpers;
3282 void *priv, *oldpriv;
3283 struct md_rdev *rdev;
3285 if (mddev->pers == NULL) {
3288 if (len >= sizeof(mddev->clevel))
3290 strncpy(mddev->clevel, buf, len);
3291 if (mddev->clevel[len-1] == '\n')
3293 mddev->clevel[len] = 0;
3294 mddev->level = LEVEL_NONE;
3300 /* request to change the personality. Need to ensure:
3301 * - array is not engaged in resync/recovery/reshape
3302 * - old personality can be suspended
3303 * - new personality will access other array.
3306 if (mddev->sync_thread ||
3307 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3308 mddev->reshape_position != MaxSector ||
3309 mddev->sysfs_active)
3312 if (!mddev->pers->quiesce) {
3313 printk(KERN_WARNING "md: %s: %s does not support online personality change\n",
3314 mdname(mddev), mddev->pers->name);
3318 /* Now find the new personality */
3319 if (len == 0 || len >= sizeof(clevel))
3321 strncpy(clevel, buf, len);
3322 if (clevel[len-1] == '\n')
3325 if (kstrtol(clevel, 10, &level))
3328 if (request_module("md-%s", clevel) != 0)
3329 request_module("md-level-%s", clevel);
3330 spin_lock(&pers_lock);
3331 pers = find_pers(level, clevel);
3332 if (!pers || !try_module_get(pers->owner)) {
3333 spin_unlock(&pers_lock);
3334 printk(KERN_WARNING "md: personality %s not loaded\n", clevel);
3337 spin_unlock(&pers_lock);
3339 if (pers == mddev->pers) {
3340 /* Nothing to do! */
3341 module_put(pers->owner);
3344 if (!pers->takeover) {
3345 module_put(pers->owner);
3346 printk(KERN_WARNING "md: %s: %s does not support personality takeover\n",
3347 mdname(mddev), clevel);
3351 rdev_for_each(rdev, mddev)
3352 rdev->new_raid_disk = rdev->raid_disk;
3354 /* ->takeover must set new_* and/or delta_disks
3355 * if it succeeds, and may set them when it fails.
3357 priv = pers->takeover(mddev);
3359 mddev->new_level = mddev->level;
3360 mddev->new_layout = mddev->layout;
3361 mddev->new_chunk_sectors = mddev->chunk_sectors;
3362 mddev->raid_disks -= mddev->delta_disks;
3363 mddev->delta_disks = 0;
3364 mddev->reshape_backwards = 0;
3365 module_put(pers->owner);
3366 printk(KERN_WARNING "md: %s: %s would not accept array\n",
3367 mdname(mddev), clevel);
3368 return PTR_ERR(priv);
3371 /* Looks like we have a winner */
3372 mddev_suspend(mddev);
3373 mddev_detach(mddev);
3375 spin_lock(&mddev->lock);
3376 oldpers = mddev->pers;
3377 oldpriv = mddev->private;
3379 mddev->private = priv;
3380 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
3381 mddev->level = mddev->new_level;
3382 mddev->layout = mddev->new_layout;
3383 mddev->chunk_sectors = mddev->new_chunk_sectors;
3384 mddev->delta_disks = 0;
3385 mddev->reshape_backwards = 0;
3386 mddev->degraded = 0;
3387 spin_unlock(&mddev->lock);
3389 if (oldpers->sync_request == NULL &&
3391 /* We are converting from a no-redundancy array
3392 * to a redundancy array and metadata is managed
3393 * externally so we need to be sure that writes
3394 * won't block due to a need to transition
3396 * until external management is started.
3399 mddev->safemode_delay = 0;
3400 mddev->safemode = 0;
3403 oldpers->free(mddev, oldpriv);
3405 if (oldpers->sync_request == NULL &&
3406 pers->sync_request != NULL) {
3407 /* need to add the md_redundancy_group */
3408 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
3410 "md: cannot register extra attributes for %s\n",
3412 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action");
3414 if (oldpers->sync_request != NULL &&
3415 pers->sync_request == NULL) {
3416 /* need to remove the md_redundancy_group */
3417 if (mddev->to_remove == NULL)
3418 mddev->to_remove = &md_redundancy_group;
3421 rdev_for_each(rdev, mddev) {
3422 if (rdev->raid_disk < 0)
3424 if (rdev->new_raid_disk >= mddev->raid_disks)
3425 rdev->new_raid_disk = -1;
3426 if (rdev->new_raid_disk == rdev->raid_disk)
3428 sysfs_unlink_rdev(mddev, rdev);
3430 rdev_for_each(rdev, mddev) {
3431 if (rdev->raid_disk < 0)
3433 if (rdev->new_raid_disk == rdev->raid_disk)
3435 rdev->raid_disk = rdev->new_raid_disk;
3436 if (rdev->raid_disk < 0)
3437 clear_bit(In_sync, &rdev->flags);
3439 if (sysfs_link_rdev(mddev, rdev))
3440 printk(KERN_WARNING "md: cannot register rd%d"
3441 " for %s after level change\n",
3442 rdev->raid_disk, mdname(mddev));
3446 if (pers->sync_request == NULL) {
3447 /* this is now an array without redundancy, so
3448 * it must always be in_sync
3451 del_timer_sync(&mddev->safemode_timer);
3453 blk_set_stacking_limits(&mddev->queue->limits);
3455 set_bit(MD_CHANGE_DEVS, &mddev->flags);
3456 mddev_resume(mddev);
3458 md_update_sb(mddev, 1);
3459 sysfs_notify(&mddev->kobj, NULL, "level");
3460 md_new_event(mddev);
3464 static struct md_sysfs_entry md_level =
3465 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
3468 layout_show(struct mddev *mddev, char *page)
3470 /* just a number, not meaningful for all levels */
3471 if (mddev->reshape_position != MaxSector &&
3472 mddev->layout != mddev->new_layout)
3473 return sprintf(page, "%d (%d)\n",
3474 mddev->new_layout, mddev->layout);
3475 return sprintf(page, "%d\n", mddev->layout);
3479 layout_store(struct mddev *mddev, const char *buf, size_t len)
3482 unsigned long n = simple_strtoul(buf, &e, 10);
3484 if (!*buf || (*e && *e != '\n'))
3489 if (mddev->pers->check_reshape == NULL)
3493 mddev->new_layout = n;
3494 err = mddev->pers->check_reshape(mddev);
3496 mddev->new_layout = mddev->layout;
3500 mddev->new_layout = n;
3501 if (mddev->reshape_position == MaxSector)
3506 static struct md_sysfs_entry md_layout =
3507 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
3510 raid_disks_show(struct mddev *mddev, char *page)
3512 if (mddev->raid_disks == 0)
3514 if (mddev->reshape_position != MaxSector &&
3515 mddev->delta_disks != 0)
3516 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
3517 mddev->raid_disks - mddev->delta_disks);
3518 return sprintf(page, "%d\n", mddev->raid_disks);
3521 static int update_raid_disks(struct mddev *mddev, int raid_disks);
3524 raid_disks_store(struct mddev *mddev, const char *buf, size_t len)
3528 unsigned long n = simple_strtoul(buf, &e, 10);
3530 if (!*buf || (*e && *e != '\n'))
3534 rv = update_raid_disks(mddev, n);
3535 else if (mddev->reshape_position != MaxSector) {
3536 struct md_rdev *rdev;
3537 int olddisks = mddev->raid_disks - mddev->delta_disks;
3539 rdev_for_each(rdev, mddev) {
3541 rdev->data_offset < rdev->new_data_offset)
3544 rdev->data_offset > rdev->new_data_offset)
3547 mddev->delta_disks = n - olddisks;
3548 mddev->raid_disks = n;
3549 mddev->reshape_backwards = (mddev->delta_disks < 0);
3551 mddev->raid_disks = n;
3552 return rv ? rv : len;
3554 static struct md_sysfs_entry md_raid_disks =
3555 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
3558 chunk_size_show(struct mddev *mddev, char *page)
3560 if (mddev->reshape_position != MaxSector &&
3561 mddev->chunk_sectors != mddev->new_chunk_sectors)
3562 return sprintf(page, "%d (%d)\n",
3563 mddev->new_chunk_sectors << 9,
3564 mddev->chunk_sectors << 9);
3565 return sprintf(page, "%d\n", mddev->chunk_sectors << 9);
3569 chunk_size_store(struct mddev *mddev, const char *buf, size_t len)
3572 unsigned long n = simple_strtoul(buf, &e, 10);
3574 if (!*buf || (*e && *e != '\n'))
3579 if (mddev->pers->check_reshape == NULL)
3583 mddev->new_chunk_sectors = n >> 9;
3584 err = mddev->pers->check_reshape(mddev);
3586 mddev->new_chunk_sectors = mddev->chunk_sectors;
3590 mddev->new_chunk_sectors = n >> 9;
3591 if (mddev->reshape_position == MaxSector)
3592 mddev->chunk_sectors = n >> 9;
3596 static struct md_sysfs_entry md_chunk_size =
3597 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
3600 resync_start_show(struct mddev *mddev, char *page)
3602 if (mddev->recovery_cp == MaxSector)
3603 return sprintf(page, "none\n");
3604 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
3608 resync_start_store(struct mddev *mddev, const char *buf, size_t len)
3611 unsigned long long n = simple_strtoull(buf, &e, 10);
3613 if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
3615 if (cmd_match(buf, "none"))
3617 else if (!*buf || (*e && *e != '\n'))
3620 mddev->recovery_cp = n;
3622 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
3625 static struct md_sysfs_entry md_resync_start =
3626 __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store);
3629 * The array state can be:
3632 * No devices, no size, no level
3633 * Equivalent to STOP_ARRAY ioctl
3635 * May have some settings, but array is not active
3636 * all IO results in error
3637 * When written, doesn't tear down array, but just stops it
3638 * suspended (not supported yet)
3639 * All IO requests will block. The array can be reconfigured.
3640 * Writing this, if accepted, will block until array is quiescent
3642 * no resync can happen. no superblocks get written.
3643 * write requests fail
3645 * like readonly, but behaves like 'clean' on a write request.
3647 * clean - no pending writes, but otherwise active.
3648 * When written to inactive array, starts without resync
3649 * If a write request arrives then
3650 * if metadata is known, mark 'dirty' and switch to 'active'.
3651 * if not known, block and switch to write-pending
3652 * If written to an active array that has pending writes, then fails.
3654 * fully active: IO and resync can be happening.
3655 * When written to inactive array, starts with resync
3658 * clean, but writes are blocked waiting for 'active' to be written.
3661 * like active, but no writes have been seen for a while (100msec).
3664 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
3665 write_pending, active_idle, bad_word};
3666 static char *array_states[] = {
3667 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3668 "write-pending", "active-idle", NULL };
3670 static int match_word(const char *word, char **list)
3673 for (n=0; list[n]; n++)
3674 if (cmd_match(word, list[n]))
3680 array_state_show(struct mddev *mddev, char *page)
3682 enum array_state st = inactive;
3695 else if (test_bit(MD_CHANGE_PENDING, &mddev->flags))
3697 else if (mddev->safemode)
3703 if (list_empty(&mddev->disks) &&
3704 mddev->raid_disks == 0 &&
3705 mddev->dev_sectors == 0)
3710 return sprintf(page, "%s\n", array_states[st]);
3713 static int do_md_stop(struct mddev *mddev, int ro, struct block_device *bdev);
3714 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev);
3715 static int do_md_run(struct mddev *mddev);
3716 static int restart_array(struct mddev *mddev);
3719 array_state_store(struct mddev *mddev, const char *buf, size_t len)
3722 enum array_state st = match_word(buf, array_states);
3727 /* stopping an active array */
3728 err = do_md_stop(mddev, 0, NULL);
3731 /* stopping an active array */
3733 err = do_md_stop(mddev, 2, NULL);
3735 err = 0; /* already inactive */
3738 break; /* not supported yet */
3741 err = md_set_readonly(mddev, NULL);
3744 set_disk_ro(mddev->gendisk, 1);
3745 err = do_md_run(mddev);
3751 err = md_set_readonly(mddev, NULL);
3752 else if (mddev->ro == 1)
3753 err = restart_array(mddev);
3756 set_disk_ro(mddev->gendisk, 0);
3760 err = do_md_run(mddev);
3765 restart_array(mddev);
3766 spin_lock(&mddev->lock);
3767 if (atomic_read(&mddev->writes_pending) == 0) {
3768 if (mddev->in_sync == 0) {
3770 if (mddev->safemode == 1)
3771 mddev->safemode = 0;
3772 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
3777 spin_unlock(&mddev->lock);
3783 restart_array(mddev);
3784 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
3785 wake_up(&mddev->sb_wait);
3789 set_disk_ro(mddev->gendisk, 0);
3790 err = do_md_run(mddev);
3795 /* these cannot be set */
3801 if (mddev->hold_active == UNTIL_IOCTL)
3802 mddev->hold_active = 0;
3803 sysfs_notify_dirent_safe(mddev->sysfs_state);
3807 static struct md_sysfs_entry md_array_state =
3808 __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
3811 max_corrected_read_errors_show(struct mddev *mddev, char *page) {
3812 return sprintf(page, "%d\n",
3813 atomic_read(&mddev->max_corr_read_errors));
3817 max_corrected_read_errors_store(struct mddev *mddev, const char *buf, size_t len)
3820 unsigned long n = simple_strtoul(buf, &e, 10);
3822 if (*buf && (*e == 0 || *e == '\n')) {
3823 atomic_set(&mddev->max_corr_read_errors, n);
3829 static struct md_sysfs_entry max_corr_read_errors =
3830 __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show,
3831 max_corrected_read_errors_store);
3834 null_show(struct mddev *mddev, char *page)
3840 new_dev_store(struct mddev *mddev, const char *buf, size_t len)
3842 /* buf must be %d:%d\n? giving major and minor numbers */
3843 /* The new device is added to the array.
3844 * If the array has a persistent superblock, we read the
3845 * superblock to initialise info and check validity.
3846 * Otherwise, only checking done is that in bind_rdev_to_array,
3847 * which mainly checks size.
3850 int major = simple_strtoul(buf, &e, 10);
3853 struct md_rdev *rdev;
3856 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
3858 minor = simple_strtoul(e+1, &e, 10);
3859 if (*e && *e != '\n')
3861 dev = MKDEV(major, minor);
3862 if (major != MAJOR(dev) ||
3863 minor != MINOR(dev))
3866 if (mddev->persistent) {
3867 rdev = md_import_device(dev, mddev->major_version,
3868 mddev->minor_version);
3869 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
3870 struct md_rdev *rdev0
3871 = list_entry(mddev->disks.next,
3872 struct md_rdev, same_set);
3873 err = super_types[mddev->major_version]
3874 .load_super(rdev, rdev0, mddev->minor_version);
3878 } else if (mddev->external)
3879 rdev = md_import_device(dev, -2, -1);
3881 rdev = md_import_device(dev, -1, -1);
3884 return PTR_ERR(rdev);
3885 err = bind_rdev_to_array(rdev, mddev);
3889 return err ? err : len;
3892 static struct md_sysfs_entry md_new_device =
3893 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
3896 bitmap_store(struct mddev *mddev, const char *buf, size_t len)
3899 unsigned long chunk, end_chunk;
3903 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
3905 chunk = end_chunk = simple_strtoul(buf, &end, 0);
3906 if (buf == end) break;
3907 if (*end == '-') { /* range */
3909 end_chunk = simple_strtoul(buf, &end, 0);
3910 if (buf == end) break;
3912 if (*end && !isspace(*end)) break;
3913 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
3914 buf = skip_spaces(end);
3916 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
3921 static struct md_sysfs_entry md_bitmap =
3922 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
3925 size_show(struct mddev *mddev, char *page)
3927 return sprintf(page, "%llu\n",
3928 (unsigned long long)mddev->dev_sectors / 2);
3931 static int update_size(struct mddev *mddev, sector_t num_sectors);
3934 size_store(struct mddev *mddev, const char *buf, size_t len)
3936 /* If array is inactive, we can reduce the component size, but
3937 * not increase it (except from 0).
3938 * If array is active, we can try an on-line resize
3941 int err = strict_blocks_to_sectors(buf, §ors);
3946 err = update_size(mddev, sectors);
3947 md_update_sb(mddev, 1);
3949 if (mddev->dev_sectors == 0 ||
3950 mddev->dev_sectors > sectors)
3951 mddev->dev_sectors = sectors;
3955 return err ? err : len;
3958 static struct md_sysfs_entry md_size =
3959 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
3961 /* Metadata version.
3963 * 'none' for arrays with no metadata (good luck...)
3964 * 'external' for arrays with externally managed metadata,
3965 * or N.M for internally known formats
3968 metadata_show(struct mddev *mddev, char *page)
3970 if (mddev->persistent)
3971 return sprintf(page, "%d.%d\n",
3972 mddev->major_version, mddev->minor_version);
3973 else if (mddev->external)
3974 return sprintf(page, "external:%s\n", mddev->metadata_type);
3976 return sprintf(page, "none\n");
3980 metadata_store(struct mddev *mddev, const char *buf, size_t len)
3984 /* Changing the details of 'external' metadata is
3985 * always permitted. Otherwise there must be
3986 * no devices attached to the array.
3988 if (mddev->external && strncmp(buf, "external:", 9) == 0)
3990 else if (!list_empty(&mddev->disks))
3993 if (cmd_match(buf, "none")) {
3994 mddev->persistent = 0;
3995 mddev->external = 0;
3996 mddev->major_version = 0;
3997 mddev->minor_version = 90;
4000 if (strncmp(buf, "external:", 9) == 0) {
4001 size_t namelen = len-9;
4002 if (namelen >= sizeof(mddev->metadata_type))
4003 namelen = sizeof(mddev->metadata_type)-1;
4004 strncpy(mddev->metadata_type, buf+9, namelen);
4005 mddev->metadata_type[namelen] = 0;
4006 if (namelen && mddev->metadata_type[namelen-1] == '\n')
4007 mddev->metadata_type[--namelen] = 0;
4008 mddev->persistent = 0;
4009 mddev->external = 1;
4010 mddev->major_version = 0;
4011 mddev->minor_version = 90;
4014 major = simple_strtoul(buf, &e, 10);
4015 if (e==buf || *e != '.')
4018 minor = simple_strtoul(buf, &e, 10);
4019 if (e==buf || (*e && *e != '\n') )
4021 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
4023 mddev->major_version = major;
4024 mddev->minor_version = minor;
4025 mddev->persistent = 1;
4026 mddev->external = 0;
4030 static struct md_sysfs_entry md_metadata =
4031 __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
4034 action_show(struct mddev *mddev, char *page)
4036 char *type = "idle";
4037 unsigned long recovery = mddev->recovery;
4038 if (test_bit(MD_RECOVERY_FROZEN, &recovery))
4040 else if (test_bit(MD_RECOVERY_RUNNING, &recovery) ||
4041 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &recovery))) {
4042 if (test_bit(MD_RECOVERY_RESHAPE, &recovery))
4044 else if (test_bit(MD_RECOVERY_SYNC, &recovery)) {
4045 if (!test_bit(MD_RECOVERY_REQUESTED, &recovery))
4047 else if (test_bit(MD_RECOVERY_CHECK, &recovery))
4051 } else if (test_bit(MD_RECOVERY_RECOVER, &recovery))
4054 return sprintf(page, "%s\n", type);
4058 action_store(struct mddev *mddev, const char *page, size_t len)
4060 if (!mddev->pers || !mddev->pers->sync_request)
4063 if (cmd_match(page, "frozen"))
4064 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4066 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4068 if (cmd_match(page, "idle") || cmd_match(page, "frozen")) {
4069 flush_workqueue(md_misc_wq);
4070 if (mddev->sync_thread) {
4071 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4072 md_reap_sync_thread(mddev);
4074 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
4075 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
4077 else if (cmd_match(page, "resync"))
4078 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4079 else if (cmd_match(page, "recover")) {
4080 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
4081 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4082 } else if (cmd_match(page, "reshape")) {
4084 if (mddev->pers->start_reshape == NULL)
4086 err = mddev->pers->start_reshape(mddev);
4089 sysfs_notify(&mddev->kobj, NULL, "degraded");
4091 if (cmd_match(page, "check"))
4092 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
4093 else if (!cmd_match(page, "repair"))
4095 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
4096 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
4098 if (mddev->ro == 2) {
4099 /* A write to sync_action is enough to justify
4100 * canceling read-auto mode
4103 md_wakeup_thread(mddev->sync_thread);
4105 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4106 md_wakeup_thread(mddev->thread);
4107 sysfs_notify_dirent_safe(mddev->sysfs_action);
4111 static struct md_sysfs_entry md_scan_mode =
4112 __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
4115 last_sync_action_show(struct mddev *mddev, char *page)
4117 return sprintf(page, "%s\n", mddev->last_sync_action);
4120 static struct md_sysfs_entry md_last_scan_mode = __ATTR_RO(last_sync_action);
4123 mismatch_cnt_show(struct mddev *mddev, char *page)
4125 return sprintf(page, "%llu\n",
4126 (unsigned long long)
4127 atomic64_read(&mddev->resync_mismatches));
4130 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
4133 sync_min_show(struct mddev *mddev, char *page)
4135 return sprintf(page, "%d (%s)\n", speed_min(mddev),
4136 mddev->sync_speed_min ? "local": "system");
4140 sync_min_store(struct mddev *mddev, const char *buf, size_t len)
4144 if (strncmp(buf, "system", 6)==0) {
4145 mddev->sync_speed_min = 0;
4148 min = simple_strtoul(buf, &e, 10);
4149 if (buf == e || (*e && *e != '\n') || min <= 0)
4151 mddev->sync_speed_min = min;
4155 static struct md_sysfs_entry md_sync_min =
4156 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
4159 sync_max_show(struct mddev *mddev, char *page)
4161 return sprintf(page, "%d (%s)\n", speed_max(mddev),
4162 mddev->sync_speed_max ? "local": "system");
4166 sync_max_store(struct mddev *mddev, const char *buf, size_t len)
4170 if (strncmp(buf, "system", 6)==0) {
4171 mddev->sync_speed_max = 0;
4174 max = simple_strtoul(buf, &e, 10);
4175 if (buf == e || (*e && *e != '\n') || max <= 0)
4177 mddev->sync_speed_max = max;
4181 static struct md_sysfs_entry md_sync_max =
4182 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
4185 degraded_show(struct mddev *mddev, char *page)
4187 return sprintf(page, "%d\n", mddev->degraded);
4189 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
4192 sync_force_parallel_show(struct mddev *mddev, char *page)
4194 return sprintf(page, "%d\n", mddev->parallel_resync);
4198 sync_force_parallel_store(struct mddev *mddev, const char *buf, size_t len)
4202 if (kstrtol(buf, 10, &n))
4205 if (n != 0 && n != 1)
4208 mddev->parallel_resync = n;
4210 if (mddev->sync_thread)
4211 wake_up(&resync_wait);
4216 /* force parallel resync, even with shared block devices */
4217 static struct md_sysfs_entry md_sync_force_parallel =
4218 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
4219 sync_force_parallel_show, sync_force_parallel_store);
4222 sync_speed_show(struct mddev *mddev, char *page)
4224 unsigned long resync, dt, db;
4225 if (mddev->curr_resync == 0)
4226 return sprintf(page, "none\n");
4227 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
4228 dt = (jiffies - mddev->resync_mark) / HZ;
4230 db = resync - mddev->resync_mark_cnt;
4231 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
4234 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
4237 sync_completed_show(struct mddev *mddev, char *page)
4239 unsigned long long max_sectors, resync;
4241 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4242 return sprintf(page, "none\n");
4244 if (mddev->curr_resync == 1 ||
4245 mddev->curr_resync == 2)
4246 return sprintf(page, "delayed\n");
4248 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
4249 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
4250 max_sectors = mddev->resync_max_sectors;
4252 max_sectors = mddev->dev_sectors;
4254 resync = mddev->curr_resync_completed;
4255 return sprintf(page, "%llu / %llu\n", resync, max_sectors);
4258 static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed);
4261 min_sync_show(struct mddev *mddev, char *page)
4263 return sprintf(page, "%llu\n",
4264 (unsigned long long)mddev->resync_min);
4267 min_sync_store(struct mddev *mddev, const char *buf, size_t len)
4269 unsigned long long min;
4270 if (kstrtoull(buf, 10, &min))
4272 if (min > mddev->resync_max)
4274 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4277 /* Must be a multiple of chunk_size */
4278 if (mddev->chunk_sectors) {
4279 sector_t temp = min;
4280 if (sector_div(temp, mddev->chunk_sectors))
4283 mddev->resync_min = min;
4288 static struct md_sysfs_entry md_min_sync =
4289 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
4292 max_sync_show(struct mddev *mddev, char *page)
4294 if (mddev->resync_max == MaxSector)
4295 return sprintf(page, "max\n");
4297 return sprintf(page, "%llu\n",
4298 (unsigned long long)mddev->resync_max);
4301 max_sync_store(struct mddev *mddev, const char *buf, size_t len)
4303 if (strncmp(buf, "max", 3) == 0)
4304 mddev->resync_max = MaxSector;
4306 unsigned long long max;
4307 if (kstrtoull(buf, 10, &max))
4309 if (max < mddev->resync_min)
4311 if (max < mddev->resync_max &&
4313 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4316 /* Must be a multiple of chunk_size */
4317 if (mddev->chunk_sectors) {
4318 sector_t temp = max;
4319 if (sector_div(temp, mddev->chunk_sectors))
4322 mddev->resync_max = max;
4324 wake_up(&mddev->recovery_wait);
4328 static struct md_sysfs_entry md_max_sync =
4329 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
4332 suspend_lo_show(struct mddev *mddev, char *page)
4334 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
4338 suspend_lo_store(struct mddev *mddev, const char *buf, size_t len)
4341 unsigned long long new = simple_strtoull(buf, &e, 10);
4342 unsigned long long old = mddev->suspend_lo;
4344 if (mddev->pers == NULL ||
4345 mddev->pers->quiesce == NULL)
4347 if (buf == e || (*e && *e != '\n'))
4350 mddev->suspend_lo = new;
4352 /* Shrinking suspended region */
4353 mddev->pers->quiesce(mddev, 2);
4355 /* Expanding suspended region - need to wait */
4356 mddev->pers->quiesce(mddev, 1);
4357 mddev->pers->quiesce(mddev, 0);
4361 static struct md_sysfs_entry md_suspend_lo =
4362 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
4365 suspend_hi_show(struct mddev *mddev, char *page)
4367 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
4371 suspend_hi_store(struct mddev *mddev, const char *buf, size_t len)
4374 unsigned long long new = simple_strtoull(buf, &e, 10);
4375 unsigned long long old = mddev->suspend_hi;
4377 if (mddev->pers == NULL ||
4378 mddev->pers->quiesce == NULL)
4380 if (buf == e || (*e && *e != '\n'))
4383 mddev->suspend_hi = new;
4385 /* Shrinking suspended region */
4386 mddev->pers->quiesce(mddev, 2);
4388 /* Expanding suspended region - need to wait */
4389 mddev->pers->quiesce(mddev, 1);
4390 mddev->pers->quiesce(mddev, 0);
4394 static struct md_sysfs_entry md_suspend_hi =
4395 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
4398 reshape_position_show(struct mddev *mddev, char *page)
4400 if (mddev->reshape_position != MaxSector)
4401 return sprintf(page, "%llu\n",
4402 (unsigned long long)mddev->reshape_position);
4403 strcpy(page, "none\n");
4408 reshape_position_store(struct mddev *mddev, const char *buf, size_t len)
4410 struct md_rdev *rdev;
4412 unsigned long long new = simple_strtoull(buf, &e, 10);
4415 if (buf == e || (*e && *e != '\n'))
4417 mddev->reshape_position = new;
4418 mddev->delta_disks = 0;
4419 mddev->reshape_backwards = 0;
4420 mddev->new_level = mddev->level;
4421 mddev->new_layout = mddev->layout;
4422 mddev->new_chunk_sectors = mddev->chunk_sectors;
4423 rdev_for_each(rdev, mddev)
4424 rdev->new_data_offset = rdev->data_offset;
4428 static struct md_sysfs_entry md_reshape_position =
4429 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
4430 reshape_position_store);
4433 reshape_direction_show(struct mddev *mddev, char *page)
4435 return sprintf(page, "%s\n",
4436 mddev->reshape_backwards ? "backwards" : "forwards");
4440 reshape_direction_store(struct mddev *mddev, const char *buf, size_t len)
4443 if (cmd_match(buf, "forwards"))
4445 else if (cmd_match(buf, "backwards"))
4449 if (mddev->reshape_backwards == backwards)
4452 /* check if we are allowed to change */
4453 if (mddev->delta_disks)
4456 if (mddev->persistent &&
4457 mddev->major_version == 0)
4460 mddev->reshape_backwards = backwards;
4464 static struct md_sysfs_entry md_reshape_direction =
4465 __ATTR(reshape_direction, S_IRUGO|S_IWUSR, reshape_direction_show,
4466 reshape_direction_store);
4469 array_size_show(struct mddev *mddev, char *page)
4471 if (mddev->external_size)
4472 return sprintf(page, "%llu\n",
4473 (unsigned long long)mddev->array_sectors/2);
4475 return sprintf(page, "default\n");
4479 array_size_store(struct mddev *mddev, const char *buf, size_t len)
4483 if (strncmp(buf, "default", 7) == 0) {
4485 sectors = mddev->pers->size(mddev, 0, 0);
4487 sectors = mddev->array_sectors;
4489 mddev->external_size = 0;
4491 if (strict_blocks_to_sectors(buf, §ors) < 0)
4493 if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors)
4496 mddev->external_size = 1;
4499 mddev->array_sectors = sectors;
4501 set_capacity(mddev->gendisk, mddev->array_sectors);
4502 revalidate_disk(mddev->gendisk);
4507 static struct md_sysfs_entry md_array_size =
4508 __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show,
4511 static struct attribute *md_default_attrs[] = {
4514 &md_raid_disks.attr,
4515 &md_chunk_size.attr,
4517 &md_resync_start.attr,
4519 &md_new_device.attr,
4520 &md_safe_delay.attr,
4521 &md_array_state.attr,
4522 &md_reshape_position.attr,
4523 &md_reshape_direction.attr,
4524 &md_array_size.attr,
4525 &max_corr_read_errors.attr,
4529 static struct attribute *md_redundancy_attrs[] = {
4531 &md_last_scan_mode.attr,
4532 &md_mismatches.attr,
4535 &md_sync_speed.attr,
4536 &md_sync_force_parallel.attr,
4537 &md_sync_completed.attr,
4540 &md_suspend_lo.attr,
4541 &md_suspend_hi.attr,
4546 static struct attribute_group md_redundancy_group = {
4548 .attrs = md_redundancy_attrs,
4552 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
4554 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
4555 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
4560 spin_lock(&all_mddevs_lock);
4561 if (list_empty(&mddev->all_mddevs)) {
4562 spin_unlock(&all_mddevs_lock);
4566 spin_unlock(&all_mddevs_lock);
4568 rv = entry->show(mddev, page);
4574 md_attr_store(struct kobject *kobj, struct attribute *attr,
4575 const char *page, size_t length)
4577 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
4578 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
4583 if (!capable(CAP_SYS_ADMIN))
4585 spin_lock(&all_mddevs_lock);
4586 if (list_empty(&mddev->all_mddevs)) {
4587 spin_unlock(&all_mddevs_lock);
4591 spin_unlock(&all_mddevs_lock);
4592 if (entry->store == new_dev_store)
4593 flush_workqueue(md_misc_wq);
4594 rv = mddev_lock(mddev);
4596 rv = entry->store(mddev, page, length);
4597 mddev_unlock(mddev);
4603 static void md_free(struct kobject *ko)
4605 struct mddev *mddev = container_of(ko, struct mddev, kobj);
4607 if (mddev->sysfs_state)
4608 sysfs_put(mddev->sysfs_state);
4610 if (mddev->gendisk) {
4611 del_gendisk(mddev->gendisk);
4612 put_disk(mddev->gendisk);
4615 blk_cleanup_queue(mddev->queue);
4620 static const struct sysfs_ops md_sysfs_ops = {
4621 .show = md_attr_show,
4622 .store = md_attr_store,
4624 static struct kobj_type md_ktype = {
4626 .sysfs_ops = &md_sysfs_ops,
4627 .default_attrs = md_default_attrs,
4632 static void mddev_delayed_delete(struct work_struct *ws)
4634 struct mddev *mddev = container_of(ws, struct mddev, del_work);
4636 sysfs_remove_group(&mddev->kobj, &md_bitmap_group);
4637 kobject_del(&mddev->kobj);
4638 kobject_put(&mddev->kobj);
4641 static int md_alloc(dev_t dev, char *name)
4643 static DEFINE_MUTEX(disks_mutex);
4644 struct mddev *mddev = mddev_find(dev);
4645 struct gendisk *disk;
4654 partitioned = (MAJOR(mddev->unit) != MD_MAJOR);
4655 shift = partitioned ? MdpMinorShift : 0;
4656 unit = MINOR(mddev->unit) >> shift;
4658 /* wait for any previous instance of this device to be
4659 * completely removed (mddev_delayed_delete).
4661 flush_workqueue(md_misc_wq);
4663 mutex_lock(&disks_mutex);
4669 /* Need to ensure that 'name' is not a duplicate.
4671 struct mddev *mddev2;
4672 spin_lock(&all_mddevs_lock);
4674 list_for_each_entry(mddev2, &all_mddevs, all_mddevs)
4675 if (mddev2->gendisk &&
4676 strcmp(mddev2->gendisk->disk_name, name) == 0) {
4677 spin_unlock(&all_mddevs_lock);
4680 spin_unlock(&all_mddevs_lock);
4684 mddev->queue = blk_alloc_queue(GFP_KERNEL);
4687 mddev->queue->queuedata = mddev;
4689 blk_queue_make_request(mddev->queue, md_make_request);
4690 blk_set_stacking_limits(&mddev->queue->limits);
4692 disk = alloc_disk(1 << shift);
4694 blk_cleanup_queue(mddev->queue);
4695 mddev->queue = NULL;
4698 disk->major = MAJOR(mddev->unit);
4699 disk->first_minor = unit << shift;
4701 strcpy(disk->disk_name, name);
4702 else if (partitioned)
4703 sprintf(disk->disk_name, "md_d%d", unit);
4705 sprintf(disk->disk_name, "md%d", unit);
4706 disk->fops = &md_fops;
4707 disk->private_data = mddev;
4708 disk->queue = mddev->queue;
4709 blk_queue_flush(mddev->queue, REQ_FLUSH | REQ_FUA);
4710 /* Allow extended partitions. This makes the
4711 * 'mdp' device redundant, but we can't really
4714 disk->flags |= GENHD_FL_EXT_DEVT;
4715 mddev->gendisk = disk;
4716 /* As soon as we call add_disk(), another thread could get
4717 * through to md_open, so make sure it doesn't get too far
4719 mutex_lock(&mddev->open_mutex);
4722 error = kobject_init_and_add(&mddev->kobj, &md_ktype,
4723 &disk_to_dev(disk)->kobj, "%s", "md");
4725 /* This isn't possible, but as kobject_init_and_add is marked
4726 * __must_check, we must do something with the result
4728 printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
4732 if (mddev->kobj.sd &&
4733 sysfs_create_group(&mddev->kobj, &md_bitmap_group))
4734 printk(KERN_DEBUG "pointless warning\n");
4735 mutex_unlock(&mddev->open_mutex);
4737 mutex_unlock(&disks_mutex);
4738 if (!error && mddev->kobj.sd) {
4739 kobject_uevent(&mddev->kobj, KOBJ_ADD);
4740 mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state");
4746 static struct kobject *md_probe(dev_t dev, int *part, void *data)
4748 md_alloc(dev, NULL);
4752 static int add_named_array(const char *val, struct kernel_param *kp)
4754 /* val must be "md_*" where * is not all digits.
4755 * We allocate an array with a large free minor number, and
4756 * set the name to val. val must not already be an active name.
4758 int len = strlen(val);
4759 char buf[DISK_NAME_LEN];
4761 while (len && val[len-1] == '\n')
4763 if (len >= DISK_NAME_LEN)
4765 strlcpy(buf, val, len+1);
4766 if (strncmp(buf, "md_", 3) != 0)
4768 return md_alloc(0, buf);
4771 static void md_safemode_timeout(unsigned long data)
4773 struct mddev *mddev = (struct mddev *) data;
4775 if (!atomic_read(&mddev->writes_pending)) {
4776 mddev->safemode = 1;
4777 if (mddev->external)
4778 sysfs_notify_dirent_safe(mddev->sysfs_state);
4780 md_wakeup_thread(mddev->thread);
4783 static int start_dirty_degraded;
4785 int md_run(struct mddev *mddev)
4788 struct md_rdev *rdev;
4789 struct md_personality *pers;
4791 if (list_empty(&mddev->disks))
4792 /* cannot run an array with no devices.. */
4797 /* Cannot run until previous stop completes properly */
4798 if (mddev->sysfs_active)
4802 * Analyze all RAID superblock(s)
4804 if (!mddev->raid_disks) {
4805 if (!mddev->persistent)
4810 if (mddev->level != LEVEL_NONE)
4811 request_module("md-level-%d", mddev->level);
4812 else if (mddev->clevel[0])
4813 request_module("md-%s", mddev->clevel);
4816 * Drop all container device buffers, from now on
4817 * the only valid external interface is through the md
4820 rdev_for_each(rdev, mddev) {
4821 if (test_bit(Faulty, &rdev->flags))
4823 sync_blockdev(rdev->bdev);
4824 invalidate_bdev(rdev->bdev);
4826 /* perform some consistency tests on the device.
4827 * We don't want the data to overlap the metadata,
4828 * Internal Bitmap issues have been handled elsewhere.
4830 if (rdev->meta_bdev) {
4831 /* Nothing to check */;
4832 } else if (rdev->data_offset < rdev->sb_start) {
4833 if (mddev->dev_sectors &&
4834 rdev->data_offset + mddev->dev_sectors
4836 printk("md: %s: data overlaps metadata\n",
4841 if (rdev->sb_start + rdev->sb_size/512
4842 > rdev->data_offset) {
4843 printk("md: %s: metadata overlaps data\n",
4848 sysfs_notify_dirent_safe(rdev->sysfs_state);
4851 if (mddev->bio_set == NULL)
4852 mddev->bio_set = bioset_create(BIO_POOL_SIZE, 0);
4854 spin_lock(&pers_lock);
4855 pers = find_pers(mddev->level, mddev->clevel);
4856 if (!pers || !try_module_get(pers->owner)) {
4857 spin_unlock(&pers_lock);
4858 if (mddev->level != LEVEL_NONE)
4859 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
4862 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
4866 spin_unlock(&pers_lock);
4867 if (mddev->level != pers->level) {
4868 mddev->level = pers->level;
4869 mddev->new_level = pers->level;
4871 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
4873 if (mddev->reshape_position != MaxSector &&
4874 pers->start_reshape == NULL) {
4875 /* This personality cannot handle reshaping... */
4876 module_put(pers->owner);
4880 if (pers->sync_request) {
4881 /* Warn if this is a potentially silly
4884 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
4885 struct md_rdev *rdev2;
4888 rdev_for_each(rdev, mddev)
4889 rdev_for_each(rdev2, mddev) {
4891 rdev->bdev->bd_contains ==
4892 rdev2->bdev->bd_contains) {
4894 "%s: WARNING: %s appears to be"
4895 " on the same physical disk as"
4898 bdevname(rdev->bdev,b),
4899 bdevname(rdev2->bdev,b2));
4906 "True protection against single-disk"
4907 " failure might be compromised.\n");
4910 mddev->recovery = 0;
4911 /* may be over-ridden by personality */
4912 mddev->resync_max_sectors = mddev->dev_sectors;
4914 mddev->ok_start_degraded = start_dirty_degraded;
4916 if (start_readonly && mddev->ro == 0)
4917 mddev->ro = 2; /* read-only, but switch on first write */
4919 err = pers->run(mddev);
4921 printk(KERN_ERR "md: pers->run() failed ...\n");
4922 else if (pers->size(mddev, 0, 0) < mddev->array_sectors) {
4923 WARN_ONCE(!mddev->external_size, "%s: default size too small,"
4924 " but 'external_size' not in effect?\n", __func__);
4926 "md: invalid array_size %llu > default size %llu\n",
4927 (unsigned long long)mddev->array_sectors / 2,
4928 (unsigned long long)pers->size(mddev, 0, 0) / 2);
4931 if (err == 0 && pers->sync_request &&
4932 (mddev->bitmap_info.file || mddev->bitmap_info.offset)) {
4933 err = bitmap_create(mddev);
4935 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
4936 mdname(mddev), err);
4939 mddev_detach(mddev);
4940 pers->free(mddev, mddev->private);
4941 module_put(pers->owner);
4942 bitmap_destroy(mddev);
4946 mddev->queue->backing_dev_info.congested_data = mddev;
4947 mddev->queue->backing_dev_info.congested_fn = md_congested;
4948 blk_queue_merge_bvec(mddev->queue, md_mergeable_bvec);
4950 if (pers->sync_request) {
4951 if (mddev->kobj.sd &&
4952 sysfs_create_group(&mddev->kobj, &md_redundancy_group))
4954 "md: cannot register extra attributes for %s\n",
4956 mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action");
4957 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
4960 atomic_set(&mddev->writes_pending,0);
4961 atomic_set(&mddev->max_corr_read_errors,
4962 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS);
4963 mddev->safemode = 0;
4964 mddev->safemode_timer.function = md_safemode_timeout;
4965 mddev->safemode_timer.data = (unsigned long) mddev;
4966 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
4969 spin_lock(&mddev->lock);
4972 spin_unlock(&mddev->lock);
4973 rdev_for_each(rdev, mddev)
4974 if (rdev->raid_disk >= 0)
4975 if (sysfs_link_rdev(mddev, rdev))
4976 /* failure here is OK */;
4978 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4980 if (mddev->flags & MD_UPDATE_SB_FLAGS)
4981 md_update_sb(mddev, 0);
4983 md_new_event(mddev);
4984 sysfs_notify_dirent_safe(mddev->sysfs_state);
4985 sysfs_notify_dirent_safe(mddev->sysfs_action);
4986 sysfs_notify(&mddev->kobj, NULL, "degraded");
4989 EXPORT_SYMBOL_GPL(md_run);
4991 static int do_md_run(struct mddev *mddev)
4995 err = md_run(mddev);
4998 err = bitmap_load(mddev);
5000 bitmap_destroy(mddev);
5004 md_wakeup_thread(mddev->thread);
5005 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
5007 set_capacity(mddev->gendisk, mddev->array_sectors);
5008 revalidate_disk(mddev->gendisk);
5010 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
5015 static int restart_array(struct mddev *mddev)
5017 struct gendisk *disk = mddev->gendisk;
5019 /* Complain if it has no devices */
5020 if (list_empty(&mddev->disks))
5026 mddev->safemode = 0;
5028 set_disk_ro(disk, 0);
5029 printk(KERN_INFO "md: %s switched to read-write mode.\n",
5031 /* Kick recovery or resync if necessary */
5032 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5033 md_wakeup_thread(mddev->thread);
5034 md_wakeup_thread(mddev->sync_thread);
5035 sysfs_notify_dirent_safe(mddev->sysfs_state);
5039 static void md_clean(struct mddev *mddev)
5041 mddev->array_sectors = 0;
5042 mddev->external_size = 0;
5043 mddev->dev_sectors = 0;
5044 mddev->raid_disks = 0;
5045 mddev->recovery_cp = 0;
5046 mddev->resync_min = 0;
5047 mddev->resync_max = MaxSector;
5048 mddev->reshape_position = MaxSector;
5049 mddev->external = 0;
5050 mddev->persistent = 0;
5051 mddev->level = LEVEL_NONE;
5052 mddev->clevel[0] = 0;
5055 mddev->metadata_type[0] = 0;
5056 mddev->chunk_sectors = 0;
5057 mddev->ctime = mddev->utime = 0;
5059 mddev->max_disks = 0;
5061 mddev->can_decrease_events = 0;
5062 mddev->delta_disks = 0;
5063 mddev->reshape_backwards = 0;
5064 mddev->new_level = LEVEL_NONE;
5065 mddev->new_layout = 0;
5066 mddev->new_chunk_sectors = 0;
5067 mddev->curr_resync = 0;
5068 atomic64_set(&mddev->resync_mismatches, 0);
5069 mddev->suspend_lo = mddev->suspend_hi = 0;
5070 mddev->sync_speed_min = mddev->sync_speed_max = 0;
5071 mddev->recovery = 0;
5074 mddev->degraded = 0;
5075 mddev->safemode = 0;
5076 mddev->merge_check_needed = 0;
5077 mddev->bitmap_info.offset = 0;
5078 mddev->bitmap_info.default_offset = 0;
5079 mddev->bitmap_info.default_space = 0;
5080 mddev->bitmap_info.chunksize = 0;
5081 mddev->bitmap_info.daemon_sleep = 0;
5082 mddev->bitmap_info.max_write_behind = 0;
5085 static void __md_stop_writes(struct mddev *mddev)
5087 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5088 flush_workqueue(md_misc_wq);
5089 if (mddev->sync_thread) {
5090 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5091 md_reap_sync_thread(mddev);
5094 del_timer_sync(&mddev->safemode_timer);
5096 bitmap_flush(mddev);
5097 md_super_wait(mddev);
5099 if (mddev->ro == 0 &&
5100 (!mddev->in_sync || (mddev->flags & MD_UPDATE_SB_FLAGS))) {
5101 /* mark array as shutdown cleanly */
5103 md_update_sb(mddev, 1);
5107 void md_stop_writes(struct mddev *mddev)
5109 mddev_lock_nointr(mddev);
5110 __md_stop_writes(mddev);
5111 mddev_unlock(mddev);
5113 EXPORT_SYMBOL_GPL(md_stop_writes);
5115 static void mddev_detach(struct mddev *mddev)
5117 struct bitmap *bitmap = mddev->bitmap;
5118 /* wait for behind writes to complete */
5119 if (bitmap && atomic_read(&bitmap->behind_writes) > 0) {
5120 printk(KERN_INFO "md:%s: behind writes in progress - waiting to stop.\n",
5122 /* need to kick something here to make sure I/O goes? */
5123 wait_event(bitmap->behind_wait,
5124 atomic_read(&bitmap->behind_writes) == 0);
5126 if (mddev->pers && mddev->pers->quiesce) {
5127 mddev->pers->quiesce(mddev, 1);
5128 mddev->pers->quiesce(mddev, 0);
5130 md_unregister_thread(&mddev->thread);
5132 blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/
5135 static void __md_stop(struct mddev *mddev)
5137 struct md_personality *pers = mddev->pers;
5138 mddev_detach(mddev);
5139 spin_lock(&mddev->lock);
5142 spin_unlock(&mddev->lock);
5143 pers->free(mddev, mddev->private);
5144 if (pers->sync_request && mddev->to_remove == NULL)
5145 mddev->to_remove = &md_redundancy_group;
5146 module_put(pers->owner);
5147 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5150 void md_stop(struct mddev *mddev)
5152 /* stop the array and free an attached data structures.
5153 * This is called from dm-raid
5156 bitmap_destroy(mddev);
5158 bioset_free(mddev->bio_set);
5161 EXPORT_SYMBOL_GPL(md_stop);
5163 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev)
5168 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
5170 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5171 md_wakeup_thread(mddev->thread);
5173 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5174 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5175 if (mddev->sync_thread)
5176 /* Thread might be blocked waiting for metadata update
5177 * which will now never happen */
5178 wake_up_process(mddev->sync_thread->tsk);
5180 mddev_unlock(mddev);
5181 wait_event(resync_wait, !test_bit(MD_RECOVERY_RUNNING,
5183 mddev_lock_nointr(mddev);
5185 mutex_lock(&mddev->open_mutex);
5186 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
5187 mddev->sync_thread ||
5188 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
5189 (bdev && !test_bit(MD_STILL_CLOSED, &mddev->flags))) {
5190 printk("md: %s still in use.\n",mdname(mddev));
5192 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5193 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5194 md_wakeup_thread(mddev->thread);
5200 __md_stop_writes(mddev);
5206 set_disk_ro(mddev->gendisk, 1);
5207 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5208 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5209 md_wakeup_thread(mddev->thread);
5210 sysfs_notify_dirent_safe(mddev->sysfs_state);
5214 mutex_unlock(&mddev->open_mutex);
5219 * 0 - completely stop and dis-assemble array
5220 * 2 - stop but do not disassemble array
5222 static int do_md_stop(struct mddev *mddev, int mode,
5223 struct block_device *bdev)
5225 struct gendisk *disk = mddev->gendisk;
5226 struct md_rdev *rdev;
5229 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
5231 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5232 md_wakeup_thread(mddev->thread);
5234 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5235 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5236 if (mddev->sync_thread)
5237 /* Thread might be blocked waiting for metadata update
5238 * which will now never happen */
5239 wake_up_process(mddev->sync_thread->tsk);
5241 mddev_unlock(mddev);
5242 wait_event(resync_wait, (mddev->sync_thread == NULL &&
5243 !test_bit(MD_RECOVERY_RUNNING,
5244 &mddev->recovery)));
5245 mddev_lock_nointr(mddev);
5247 mutex_lock(&mddev->open_mutex);
5248 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
5249 mddev->sysfs_active ||
5250 mddev->sync_thread ||
5251 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
5252 (bdev && !test_bit(MD_STILL_CLOSED, &mddev->flags))) {
5253 printk("md: %s still in use.\n",mdname(mddev));
5254 mutex_unlock(&mddev->open_mutex);
5256 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5257 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5258 md_wakeup_thread(mddev->thread);
5264 set_disk_ro(disk, 0);
5266 __md_stop_writes(mddev);
5268 mddev->queue->merge_bvec_fn = NULL;
5269 mddev->queue->backing_dev_info.congested_fn = NULL;
5271 /* tell userspace to handle 'inactive' */
5272 sysfs_notify_dirent_safe(mddev->sysfs_state);
5274 rdev_for_each(rdev, mddev)
5275 if (rdev->raid_disk >= 0)
5276 sysfs_unlink_rdev(mddev, rdev);
5278 set_capacity(disk, 0);
5279 mutex_unlock(&mddev->open_mutex);
5281 revalidate_disk(disk);
5286 mutex_unlock(&mddev->open_mutex);
5288 * Free resources if final stop
5291 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
5293 bitmap_destroy(mddev);
5294 if (mddev->bitmap_info.file) {
5295 struct file *f = mddev->bitmap_info.file;
5296 spin_lock(&mddev->lock);
5297 mddev->bitmap_info.file = NULL;
5298 spin_unlock(&mddev->lock);
5301 mddev->bitmap_info.offset = 0;
5303 export_array(mddev);
5306 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
5307 if (mddev->hold_active == UNTIL_STOP)
5308 mddev->hold_active = 0;
5310 blk_integrity_unregister(disk);
5311 md_new_event(mddev);
5312 sysfs_notify_dirent_safe(mddev->sysfs_state);
5317 static void autorun_array(struct mddev *mddev)
5319 struct md_rdev *rdev;
5322 if (list_empty(&mddev->disks))
5325 printk(KERN_INFO "md: running: ");
5327 rdev_for_each(rdev, mddev) {
5328 char b[BDEVNAME_SIZE];
5329 printk("<%s>", bdevname(rdev->bdev,b));
5333 err = do_md_run(mddev);
5335 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
5336 do_md_stop(mddev, 0, NULL);
5341 * lets try to run arrays based on all disks that have arrived
5342 * until now. (those are in pending_raid_disks)
5344 * the method: pick the first pending disk, collect all disks with
5345 * the same UUID, remove all from the pending list and put them into
5346 * the 'same_array' list. Then order this list based on superblock
5347 * update time (freshest comes first), kick out 'old' disks and
5348 * compare superblocks. If everything's fine then run it.
5350 * If "unit" is allocated, then bump its reference count
5352 static void autorun_devices(int part)
5354 struct md_rdev *rdev0, *rdev, *tmp;
5355 struct mddev *mddev;
5356 char b[BDEVNAME_SIZE];
5358 printk(KERN_INFO "md: autorun ...\n");
5359 while (!list_empty(&pending_raid_disks)) {
5362 LIST_HEAD(candidates);
5363 rdev0 = list_entry(pending_raid_disks.next,
5364 struct md_rdev, same_set);
5366 printk(KERN_INFO "md: considering %s ...\n",
5367 bdevname(rdev0->bdev,b));
5368 INIT_LIST_HEAD(&candidates);
5369 rdev_for_each_list(rdev, tmp, &pending_raid_disks)
5370 if (super_90_load(rdev, rdev0, 0) >= 0) {
5371 printk(KERN_INFO "md: adding %s ...\n",
5372 bdevname(rdev->bdev,b));
5373 list_move(&rdev->same_set, &candidates);
5376 * now we have a set of devices, with all of them having
5377 * mostly sane superblocks. It's time to allocate the
5381 dev = MKDEV(mdp_major,
5382 rdev0->preferred_minor << MdpMinorShift);
5383 unit = MINOR(dev) >> MdpMinorShift;
5385 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
5388 if (rdev0->preferred_minor != unit) {
5389 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
5390 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
5394 md_probe(dev, NULL, NULL);
5395 mddev = mddev_find(dev);
5396 if (!mddev || !mddev->gendisk) {
5400 "md: cannot allocate memory for md drive.\n");
5403 if (mddev_lock(mddev))
5404 printk(KERN_WARNING "md: %s locked, cannot run\n",
5406 else if (mddev->raid_disks || mddev->major_version
5407 || !list_empty(&mddev->disks)) {
5409 "md: %s already running, cannot run %s\n",
5410 mdname(mddev), bdevname(rdev0->bdev,b));
5411 mddev_unlock(mddev);
5413 printk(KERN_INFO "md: created %s\n", mdname(mddev));
5414 mddev->persistent = 1;
5415 rdev_for_each_list(rdev, tmp, &candidates) {
5416 list_del_init(&rdev->same_set);
5417 if (bind_rdev_to_array(rdev, mddev))
5420 autorun_array(mddev);
5421 mddev_unlock(mddev);
5423 /* on success, candidates will be empty, on error
5426 rdev_for_each_list(rdev, tmp, &candidates) {
5427 list_del_init(&rdev->same_set);
5432 printk(KERN_INFO "md: ... autorun DONE.\n");
5434 #endif /* !MODULE */
5436 static int get_version(void __user *arg)
5440 ver.major = MD_MAJOR_VERSION;
5441 ver.minor = MD_MINOR_VERSION;
5442 ver.patchlevel = MD_PATCHLEVEL_VERSION;
5444 if (copy_to_user(arg, &ver, sizeof(ver)))
5450 static int get_array_info(struct mddev *mddev, void __user *arg)
5452 mdu_array_info_t info;
5453 int nr,working,insync,failed,spare;
5454 struct md_rdev *rdev;
5456 nr = working = insync = failed = spare = 0;
5458 rdev_for_each_rcu(rdev, mddev) {
5460 if (test_bit(Faulty, &rdev->flags))
5464 if (test_bit(In_sync, &rdev->flags))
5472 info.major_version = mddev->major_version;
5473 info.minor_version = mddev->minor_version;
5474 info.patch_version = MD_PATCHLEVEL_VERSION;
5475 info.ctime = mddev->ctime;
5476 info.level = mddev->level;
5477 info.size = mddev->dev_sectors / 2;
5478 if (info.size != mddev->dev_sectors / 2) /* overflow */
5481 info.raid_disks = mddev->raid_disks;
5482 info.md_minor = mddev->md_minor;
5483 info.not_persistent= !mddev->persistent;
5485 info.utime = mddev->utime;
5488 info.state = (1<<MD_SB_CLEAN);
5489 if (mddev->bitmap && mddev->bitmap_info.offset)
5490 info.state |= (1<<MD_SB_BITMAP_PRESENT);
5491 info.active_disks = insync;
5492 info.working_disks = working;
5493 info.failed_disks = failed;
5494 info.spare_disks = spare;
5496 info.layout = mddev->layout;
5497 info.chunk_size = mddev->chunk_sectors << 9;
5499 if (copy_to_user(arg, &info, sizeof(info)))
5505 static int get_bitmap_file(struct mddev *mddev, void __user * arg)
5507 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
5511 file = kmalloc(sizeof(*file), GFP_NOIO);
5516 spin_lock(&mddev->lock);
5517 /* bitmap disabled, zero the first byte and copy out */
5518 if (!mddev->bitmap_info.file)
5519 file->pathname[0] = '\0';
5520 else if ((ptr = d_path(&mddev->bitmap_info.file->f_path,
5521 file->pathname, sizeof(file->pathname))),
5525 memmove(file->pathname, ptr,
5526 sizeof(file->pathname)-(ptr-file->pathname));
5527 spin_unlock(&mddev->lock);
5530 copy_to_user(arg, file, sizeof(*file)))
5537 static int get_disk_info(struct mddev *mddev, void __user * arg)
5539 mdu_disk_info_t info;
5540 struct md_rdev *rdev;
5542 if (copy_from_user(&info, arg, sizeof(info)))
5546 rdev = find_rdev_nr_rcu(mddev, info.number);
5548 info.major = MAJOR(rdev->bdev->bd_dev);
5549 info.minor = MINOR(rdev->bdev->bd_dev);
5550 info.raid_disk = rdev->raid_disk;
5552 if (test_bit(Faulty, &rdev->flags))
5553 info.state |= (1<<MD_DISK_FAULTY);
5554 else if (test_bit(In_sync, &rdev->flags)) {
5555 info.state |= (1<<MD_DISK_ACTIVE);
5556 info.state |= (1<<MD_DISK_SYNC);
5558 if (test_bit(WriteMostly, &rdev->flags))
5559 info.state |= (1<<MD_DISK_WRITEMOSTLY);
5561 info.major = info.minor = 0;
5562 info.raid_disk = -1;
5563 info.state = (1<<MD_DISK_REMOVED);
5567 if (copy_to_user(arg, &info, sizeof(info)))
5573 static int add_new_disk(struct mddev *mddev, mdu_disk_info_t *info)
5575 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
5576 struct md_rdev *rdev;
5577 dev_t dev = MKDEV(info->major,info->minor);
5579 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
5582 if (!mddev->raid_disks) {
5584 /* expecting a device which has a superblock */
5585 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
5588 "md: md_import_device returned %ld\n",
5590 return PTR_ERR(rdev);
5592 if (!list_empty(&mddev->disks)) {
5593 struct md_rdev *rdev0
5594 = list_entry(mddev->disks.next,
5595 struct md_rdev, same_set);
5596 err = super_types[mddev->major_version]
5597 .load_super(rdev, rdev0, mddev->minor_version);
5600 "md: %s has different UUID to %s\n",
5601 bdevname(rdev->bdev,b),
5602 bdevname(rdev0->bdev,b2));
5607 err = bind_rdev_to_array(rdev, mddev);
5614 * add_new_disk can be used once the array is assembled
5615 * to add "hot spares". They must already have a superblock
5620 if (!mddev->pers->hot_add_disk) {
5622 "%s: personality does not support diskops!\n",
5626 if (mddev->persistent)
5627 rdev = md_import_device(dev, mddev->major_version,
5628 mddev->minor_version);
5630 rdev = md_import_device(dev, -1, -1);
5633 "md: md_import_device returned %ld\n",
5635 return PTR_ERR(rdev);
5637 /* set saved_raid_disk if appropriate */
5638 if (!mddev->persistent) {
5639 if (info->state & (1<<MD_DISK_SYNC) &&
5640 info->raid_disk < mddev->raid_disks) {
5641 rdev->raid_disk = info->raid_disk;
5642 set_bit(In_sync, &rdev->flags);
5643 clear_bit(Bitmap_sync, &rdev->flags);
5645 rdev->raid_disk = -1;
5646 rdev->saved_raid_disk = rdev->raid_disk;
5648 super_types[mddev->major_version].
5649 validate_super(mddev, rdev);
5650 if ((info->state & (1<<MD_DISK_SYNC)) &&
5651 rdev->raid_disk != info->raid_disk) {
5652 /* This was a hot-add request, but events doesn't
5653 * match, so reject it.
5659 clear_bit(In_sync, &rdev->flags); /* just to be sure */
5660 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
5661 set_bit(WriteMostly, &rdev->flags);
5663 clear_bit(WriteMostly, &rdev->flags);
5665 rdev->raid_disk = -1;
5666 err = bind_rdev_to_array(rdev, mddev);
5667 if (!err && !mddev->pers->hot_remove_disk) {
5668 /* If there is hot_add_disk but no hot_remove_disk
5669 * then added disks for geometry changes,
5670 * and should be added immediately.
5672 super_types[mddev->major_version].
5673 validate_super(mddev, rdev);
5674 err = mddev->pers->hot_add_disk(mddev, rdev);
5676 unbind_rdev_from_array(rdev);
5681 sysfs_notify_dirent_safe(rdev->sysfs_state);
5683 set_bit(MD_CHANGE_DEVS, &mddev->flags);
5684 if (mddev->degraded)
5685 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
5686 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5688 md_new_event(mddev);
5689 md_wakeup_thread(mddev->thread);
5693 /* otherwise, add_new_disk is only allowed
5694 * for major_version==0 superblocks
5696 if (mddev->major_version != 0) {
5697 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
5702 if (!(info->state & (1<<MD_DISK_FAULTY))) {
5704 rdev = md_import_device(dev, -1, 0);
5707 "md: error, md_import_device() returned %ld\n",
5709 return PTR_ERR(rdev);
5711 rdev->desc_nr = info->number;
5712 if (info->raid_disk < mddev->raid_disks)
5713 rdev->raid_disk = info->raid_disk;
5715 rdev->raid_disk = -1;
5717 if (rdev->raid_disk < mddev->raid_disks)
5718 if (info->state & (1<<MD_DISK_SYNC))
5719 set_bit(In_sync, &rdev->flags);
5721 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
5722 set_bit(WriteMostly, &rdev->flags);
5724 if (!mddev->persistent) {
5725 printk(KERN_INFO "md: nonpersistent superblock ...\n");
5726 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
5728 rdev->sb_start = calc_dev_sboffset(rdev);
5729 rdev->sectors = rdev->sb_start;
5731 err = bind_rdev_to_array(rdev, mddev);
5741 static int hot_remove_disk(struct mddev *mddev, dev_t dev)
5743 char b[BDEVNAME_SIZE];
5744 struct md_rdev *rdev;
5746 rdev = find_rdev(mddev, dev);
5750 clear_bit(Blocked, &rdev->flags);
5751 remove_and_add_spares(mddev, rdev);
5753 if (rdev->raid_disk >= 0)
5756 kick_rdev_from_array(rdev);
5757 md_update_sb(mddev, 1);
5758 md_new_event(mddev);
5762 printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n",
5763 bdevname(rdev->bdev,b), mdname(mddev));
5767 static int hot_add_disk(struct mddev *mddev, dev_t dev)
5769 char b[BDEVNAME_SIZE];
5771 struct md_rdev *rdev;
5776 if (mddev->major_version != 0) {
5777 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
5778 " version-0 superblocks.\n",
5782 if (!mddev->pers->hot_add_disk) {
5784 "%s: personality does not support diskops!\n",
5789 rdev = md_import_device(dev, -1, 0);
5792 "md: error, md_import_device() returned %ld\n",
5797 if (mddev->persistent)
5798 rdev->sb_start = calc_dev_sboffset(rdev);
5800 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
5802 rdev->sectors = rdev->sb_start;
5804 if (test_bit(Faulty, &rdev->flags)) {
5806 "md: can not hot-add faulty %s disk to %s!\n",
5807 bdevname(rdev->bdev,b), mdname(mddev));
5811 clear_bit(In_sync, &rdev->flags);
5813 rdev->saved_raid_disk = -1;
5814 err = bind_rdev_to_array(rdev, mddev);
5819 * The rest should better be atomic, we can have disk failures
5820 * noticed in interrupt contexts ...
5823 rdev->raid_disk = -1;
5825 md_update_sb(mddev, 1);
5828 * Kick recovery, maybe this spare has to be added to the
5829 * array immediately.
5831 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5832 md_wakeup_thread(mddev->thread);
5833 md_new_event(mddev);
5841 static int set_bitmap_file(struct mddev *mddev, int fd)
5846 if (!mddev->pers->quiesce || !mddev->thread)
5848 if (mddev->recovery || mddev->sync_thread)
5850 /* we should be able to change the bitmap.. */
5854 struct inode *inode;
5857 if (mddev->bitmap || mddev->bitmap_info.file)
5858 return -EEXIST; /* cannot add when bitmap is present */
5862 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
5867 inode = f->f_mapping->host;
5868 if (!S_ISREG(inode->i_mode)) {
5869 printk(KERN_ERR "%s: error: bitmap file must be a regular file\n",
5872 } else if (!(f->f_mode & FMODE_WRITE)) {
5873 printk(KERN_ERR "%s: error: bitmap file must open for write\n",
5876 } else if (atomic_read(&inode->i_writecount) != 1) {
5877 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
5885 mddev->bitmap_info.file = f;
5886 mddev->bitmap_info.offset = 0; /* file overrides offset */
5887 } else if (mddev->bitmap == NULL)
5888 return -ENOENT; /* cannot remove what isn't there */
5891 mddev->pers->quiesce(mddev, 1);
5893 err = bitmap_create(mddev);
5895 err = bitmap_load(mddev);
5897 if (fd < 0 || err) {
5898 bitmap_destroy(mddev);
5899 fd = -1; /* make sure to put the file */
5901 mddev->pers->quiesce(mddev, 0);
5904 struct file *f = mddev->bitmap_info.file;
5906 spin_lock(&mddev->lock);
5907 mddev->bitmap_info.file = NULL;
5908 spin_unlock(&mddev->lock);
5917 * set_array_info is used two different ways
5918 * The original usage is when creating a new array.
5919 * In this usage, raid_disks is > 0 and it together with
5920 * level, size, not_persistent,layout,chunksize determine the
5921 * shape of the array.
5922 * This will always create an array with a type-0.90.0 superblock.
5923 * The newer usage is when assembling an array.
5924 * In this case raid_disks will be 0, and the major_version field is
5925 * use to determine which style super-blocks are to be found on the devices.
5926 * The minor and patch _version numbers are also kept incase the
5927 * super_block handler wishes to interpret them.
5929 static int set_array_info(struct mddev *mddev, mdu_array_info_t *info)
5932 if (info->raid_disks == 0) {
5933 /* just setting version number for superblock loading */
5934 if (info->major_version < 0 ||
5935 info->major_version >= ARRAY_SIZE(super_types) ||
5936 super_types[info->major_version].name == NULL) {
5937 /* maybe try to auto-load a module? */
5939 "md: superblock version %d not known\n",
5940 info->major_version);
5943 mddev->major_version = info->major_version;
5944 mddev->minor_version = info->minor_version;
5945 mddev->patch_version = info->patch_version;
5946 mddev->persistent = !info->not_persistent;
5947 /* ensure mddev_put doesn't delete this now that there
5948 * is some minimal configuration.
5950 mddev->ctime = get_seconds();
5953 mddev->major_version = MD_MAJOR_VERSION;
5954 mddev->minor_version = MD_MINOR_VERSION;
5955 mddev->patch_version = MD_PATCHLEVEL_VERSION;
5956 mddev->ctime = get_seconds();
5958 mddev->level = info->level;
5959 mddev->clevel[0] = 0;
5960 mddev->dev_sectors = 2 * (sector_t)info->size;
5961 mddev->raid_disks = info->raid_disks;
5962 /* don't set md_minor, it is determined by which /dev/md* was
5965 if (info->state & (1<<MD_SB_CLEAN))
5966 mddev->recovery_cp = MaxSector;
5968 mddev->recovery_cp = 0;
5969 mddev->persistent = ! info->not_persistent;
5970 mddev->external = 0;
5972 mddev->layout = info->layout;
5973 mddev->chunk_sectors = info->chunk_size >> 9;
5975 mddev->max_disks = MD_SB_DISKS;
5977 if (mddev->persistent)
5979 set_bit(MD_CHANGE_DEVS, &mddev->flags);
5981 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
5982 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
5983 mddev->bitmap_info.offset = 0;
5985 mddev->reshape_position = MaxSector;
5988 * Generate a 128 bit UUID
5990 get_random_bytes(mddev->uuid, 16);
5992 mddev->new_level = mddev->level;
5993 mddev->new_chunk_sectors = mddev->chunk_sectors;
5994 mddev->new_layout = mddev->layout;
5995 mddev->delta_disks = 0;
5996 mddev->reshape_backwards = 0;
6001 void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors)
6003 WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__);
6005 if (mddev->external_size)
6008 mddev->array_sectors = array_sectors;
6010 EXPORT_SYMBOL(md_set_array_sectors);
6012 static int update_size(struct mddev *mddev, sector_t num_sectors)
6014 struct md_rdev *rdev;
6016 int fit = (num_sectors == 0);
6018 if (mddev->pers->resize == NULL)
6020 /* The "num_sectors" is the number of sectors of each device that
6021 * is used. This can only make sense for arrays with redundancy.
6022 * linear and raid0 always use whatever space is available. We can only
6023 * consider changing this number if no resync or reconstruction is
6024 * happening, and if the new size is acceptable. It must fit before the
6025 * sb_start or, if that is <data_offset, it must fit before the size
6026 * of each device. If num_sectors is zero, we find the largest size
6029 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
6035 rdev_for_each(rdev, mddev) {
6036 sector_t avail = rdev->sectors;
6038 if (fit && (num_sectors == 0 || num_sectors > avail))
6039 num_sectors = avail;
6040 if (avail < num_sectors)
6043 rv = mddev->pers->resize(mddev, num_sectors);
6045 revalidate_disk(mddev->gendisk);
6049 static int update_raid_disks(struct mddev *mddev, int raid_disks)
6052 struct md_rdev *rdev;
6053 /* change the number of raid disks */
6054 if (mddev->pers->check_reshape == NULL)
6058 if (raid_disks <= 0 ||
6059 (mddev->max_disks && raid_disks >= mddev->max_disks))
6061 if (mddev->sync_thread ||
6062 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
6063 mddev->reshape_position != MaxSector)
6066 rdev_for_each(rdev, mddev) {
6067 if (mddev->raid_disks < raid_disks &&
6068 rdev->data_offset < rdev->new_data_offset)
6070 if (mddev->raid_disks > raid_disks &&
6071 rdev->data_offset > rdev->new_data_offset)
6075 mddev->delta_disks = raid_disks - mddev->raid_disks;
6076 if (mddev->delta_disks < 0)
6077 mddev->reshape_backwards = 1;
6078 else if (mddev->delta_disks > 0)
6079 mddev->reshape_backwards = 0;
6081 rv = mddev->pers->check_reshape(mddev);
6083 mddev->delta_disks = 0;
6084 mddev->reshape_backwards = 0;
6090 * update_array_info is used to change the configuration of an
6092 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
6093 * fields in the info are checked against the array.
6094 * Any differences that cannot be handled will cause an error.
6095 * Normally, only one change can be managed at a time.
6097 static int update_array_info(struct mddev *mddev, mdu_array_info_t *info)
6103 /* calculate expected state,ignoring low bits */
6104 if (mddev->bitmap && mddev->bitmap_info.offset)
6105 state |= (1 << MD_SB_BITMAP_PRESENT);
6107 if (mddev->major_version != info->major_version ||
6108 mddev->minor_version != info->minor_version ||
6109 /* mddev->patch_version != info->patch_version || */
6110 mddev->ctime != info->ctime ||
6111 mddev->level != info->level ||
6112 /* mddev->layout != info->layout || */
6113 !mddev->persistent != info->not_persistent||
6114 mddev->chunk_sectors != info->chunk_size >> 9 ||
6115 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
6116 ((state^info->state) & 0xfffffe00)
6119 /* Check there is only one change */
6120 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
6122 if (mddev->raid_disks != info->raid_disks)
6124 if (mddev->layout != info->layout)
6126 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT))
6133 if (mddev->layout != info->layout) {
6135 * we don't need to do anything at the md level, the
6136 * personality will take care of it all.
6138 if (mddev->pers->check_reshape == NULL)
6141 mddev->new_layout = info->layout;
6142 rv = mddev->pers->check_reshape(mddev);
6144 mddev->new_layout = mddev->layout;
6148 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
6149 rv = update_size(mddev, (sector_t)info->size * 2);
6151 if (mddev->raid_disks != info->raid_disks)
6152 rv = update_raid_disks(mddev, info->raid_disks);
6154 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
6155 if (mddev->pers->quiesce == NULL || mddev->thread == NULL)
6157 if (mddev->recovery || mddev->sync_thread)
6159 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
6160 /* add the bitmap */
6163 if (mddev->bitmap_info.default_offset == 0)
6165 mddev->bitmap_info.offset =
6166 mddev->bitmap_info.default_offset;
6167 mddev->bitmap_info.space =
6168 mddev->bitmap_info.default_space;
6169 mddev->pers->quiesce(mddev, 1);
6170 rv = bitmap_create(mddev);
6172 rv = bitmap_load(mddev);
6174 bitmap_destroy(mddev);
6175 mddev->pers->quiesce(mddev, 0);
6177 /* remove the bitmap */
6180 if (mddev->bitmap->storage.file)
6182 mddev->pers->quiesce(mddev, 1);
6183 bitmap_destroy(mddev);
6184 mddev->pers->quiesce(mddev, 0);
6185 mddev->bitmap_info.offset = 0;
6188 md_update_sb(mddev, 1);
6192 static int set_disk_faulty(struct mddev *mddev, dev_t dev)
6194 struct md_rdev *rdev;
6197 if (mddev->pers == NULL)
6201 rdev = find_rdev_rcu(mddev, dev);
6205 md_error(mddev, rdev);
6206 if (!test_bit(Faulty, &rdev->flags))
6214 * We have a problem here : there is no easy way to give a CHS
6215 * virtual geometry. We currently pretend that we have a 2 heads
6216 * 4 sectors (with a BIG number of cylinders...). This drives
6217 * dosfs just mad... ;-)
6219 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
6221 struct mddev *mddev = bdev->bd_disk->private_data;
6225 geo->cylinders = mddev->array_sectors / 8;
6229 static inline bool md_ioctl_valid(unsigned int cmd)
6234 case GET_ARRAY_INFO:
6235 case GET_BITMAP_FILE:
6238 case HOT_REMOVE_DISK:
6241 case RESTART_ARRAY_RW:
6243 case SET_ARRAY_INFO:
6244 case SET_BITMAP_FILE:
6245 case SET_DISK_FAULTY:
6254 static int md_ioctl(struct block_device *bdev, fmode_t mode,
6255 unsigned int cmd, unsigned long arg)
6258 void __user *argp = (void __user *)arg;
6259 struct mddev *mddev = NULL;
6262 if (!md_ioctl_valid(cmd))
6267 case GET_ARRAY_INFO:
6271 if (!capable(CAP_SYS_ADMIN))
6276 * Commands dealing with the RAID driver but not any
6281 err = get_version(argp);
6287 autostart_arrays(arg);
6294 * Commands creating/starting a new array:
6297 mddev = bdev->bd_disk->private_data;
6304 /* Some actions do not requires the mutex */
6306 case GET_ARRAY_INFO:
6307 if (!mddev->raid_disks && !mddev->external)
6310 err = get_array_info(mddev, argp);
6314 if (!mddev->raid_disks && !mddev->external)
6317 err = get_disk_info(mddev, argp);
6320 case SET_DISK_FAULTY:
6321 err = set_disk_faulty(mddev, new_decode_dev(arg));
6324 case GET_BITMAP_FILE:
6325 err = get_bitmap_file(mddev, argp);
6330 if (cmd == ADD_NEW_DISK)
6331 /* need to ensure md_delayed_delete() has completed */
6332 flush_workqueue(md_misc_wq);
6334 if (cmd == HOT_REMOVE_DISK)
6335 /* need to ensure recovery thread has run */
6336 wait_event_interruptible_timeout(mddev->sb_wait,
6337 !test_bit(MD_RECOVERY_NEEDED,
6339 msecs_to_jiffies(5000));
6340 if (cmd == STOP_ARRAY || cmd == STOP_ARRAY_RO) {
6341 /* Need to flush page cache, and ensure no-one else opens
6344 mutex_lock(&mddev->open_mutex);
6345 if (mddev->pers && atomic_read(&mddev->openers) > 1) {
6346 mutex_unlock(&mddev->open_mutex);
6350 set_bit(MD_STILL_CLOSED, &mddev->flags);
6351 mutex_unlock(&mddev->open_mutex);
6352 sync_blockdev(bdev);
6354 err = mddev_lock(mddev);
6357 "md: ioctl lock interrupted, reason %d, cmd %d\n",
6362 if (cmd == SET_ARRAY_INFO) {
6363 mdu_array_info_t info;
6365 memset(&info, 0, sizeof(info));
6366 else if (copy_from_user(&info, argp, sizeof(info))) {
6371 err = update_array_info(mddev, &info);
6373 printk(KERN_WARNING "md: couldn't update"
6374 " array info. %d\n", err);
6379 if (!list_empty(&mddev->disks)) {
6381 "md: array %s already has disks!\n",
6386 if (mddev->raid_disks) {
6388 "md: array %s already initialised!\n",
6393 err = set_array_info(mddev, &info);
6395 printk(KERN_WARNING "md: couldn't set"
6396 " array info. %d\n", err);
6403 * Commands querying/configuring an existing array:
6405 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
6406 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
6407 if ((!mddev->raid_disks && !mddev->external)
6408 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
6409 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
6410 && cmd != GET_BITMAP_FILE) {
6416 * Commands even a read-only array can execute:
6419 case RESTART_ARRAY_RW:
6420 err = restart_array(mddev);
6424 err = do_md_stop(mddev, 0, bdev);
6428 err = md_set_readonly(mddev, bdev);
6431 case HOT_REMOVE_DISK:
6432 err = hot_remove_disk(mddev, new_decode_dev(arg));
6436 /* We can support ADD_NEW_DISK on read-only arrays
6437 * on if we are re-adding a preexisting device.
6438 * So require mddev->pers and MD_DISK_SYNC.
6441 mdu_disk_info_t info;
6442 if (copy_from_user(&info, argp, sizeof(info)))
6444 else if (!(info.state & (1<<MD_DISK_SYNC)))
6445 /* Need to clear read-only for this */
6448 err = add_new_disk(mddev, &info);
6454 if (get_user(ro, (int __user *)(arg))) {
6460 /* if the bdev is going readonly the value of mddev->ro
6461 * does not matter, no writes are coming
6466 /* are we are already prepared for writes? */
6470 /* transitioning to readauto need only happen for
6471 * arrays that call md_write_start
6474 err = restart_array(mddev);
6477 set_disk_ro(mddev->gendisk, 0);
6484 * The remaining ioctls are changing the state of the
6485 * superblock, so we do not allow them on read-only arrays.
6487 if (mddev->ro && mddev->pers) {
6488 if (mddev->ro == 2) {
6490 sysfs_notify_dirent_safe(mddev->sysfs_state);
6491 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6492 /* mddev_unlock will wake thread */
6493 /* If a device failed while we were read-only, we
6494 * need to make sure the metadata is updated now.
6496 if (test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
6497 mddev_unlock(mddev);
6498 wait_event(mddev->sb_wait,
6499 !test_bit(MD_CHANGE_DEVS, &mddev->flags) &&
6500 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
6501 mddev_lock_nointr(mddev);
6512 mdu_disk_info_t info;
6513 if (copy_from_user(&info, argp, sizeof(info)))
6516 err = add_new_disk(mddev, &info);
6521 err = hot_add_disk(mddev, new_decode_dev(arg));
6525 err = do_md_run(mddev);
6528 case SET_BITMAP_FILE:
6529 err = set_bitmap_file(mddev, (int)arg);
6538 if (mddev->hold_active == UNTIL_IOCTL &&
6540 mddev->hold_active = 0;
6541 mddev_unlock(mddev);
6545 #ifdef CONFIG_COMPAT
6546 static int md_compat_ioctl(struct block_device *bdev, fmode_t mode,
6547 unsigned int cmd, unsigned long arg)
6550 case HOT_REMOVE_DISK:
6552 case SET_DISK_FAULTY:
6553 case SET_BITMAP_FILE:
6554 /* These take in integer arg, do not convert */
6557 arg = (unsigned long)compat_ptr(arg);
6561 return md_ioctl(bdev, mode, cmd, arg);
6563 #endif /* CONFIG_COMPAT */
6565 static int md_open(struct block_device *bdev, fmode_t mode)
6568 * Succeed if we can lock the mddev, which confirms that
6569 * it isn't being stopped right now.
6571 struct mddev *mddev = mddev_find(bdev->bd_dev);
6577 if (mddev->gendisk != bdev->bd_disk) {
6578 /* we are racing with mddev_put which is discarding this
6582 /* Wait until bdev->bd_disk is definitely gone */
6583 flush_workqueue(md_misc_wq);
6584 /* Then retry the open from the top */
6585 return -ERESTARTSYS;
6587 BUG_ON(mddev != bdev->bd_disk->private_data);
6589 if ((err = mutex_lock_interruptible(&mddev->open_mutex)))
6593 atomic_inc(&mddev->openers);
6594 clear_bit(MD_STILL_CLOSED, &mddev->flags);
6595 mutex_unlock(&mddev->open_mutex);
6597 check_disk_change(bdev);
6602 static void md_release(struct gendisk *disk, fmode_t mode)
6604 struct mddev *mddev = disk->private_data;
6607 atomic_dec(&mddev->openers);
6611 static int md_media_changed(struct gendisk *disk)
6613 struct mddev *mddev = disk->private_data;
6615 return mddev->changed;
6618 static int md_revalidate(struct gendisk *disk)
6620 struct mddev *mddev = disk->private_data;
6625 static const struct block_device_operations md_fops =
6627 .owner = THIS_MODULE,
6629 .release = md_release,
6631 #ifdef CONFIG_COMPAT
6632 .compat_ioctl = md_compat_ioctl,
6634 .getgeo = md_getgeo,
6635 .media_changed = md_media_changed,
6636 .revalidate_disk= md_revalidate,
6639 static int md_thread(void *arg)
6641 struct md_thread *thread = arg;
6644 * md_thread is a 'system-thread', it's priority should be very
6645 * high. We avoid resource deadlocks individually in each
6646 * raid personality. (RAID5 does preallocation) We also use RR and
6647 * the very same RT priority as kswapd, thus we will never get
6648 * into a priority inversion deadlock.
6650 * we definitely have to have equal or higher priority than
6651 * bdflush, otherwise bdflush will deadlock if there are too
6652 * many dirty RAID5 blocks.
6655 allow_signal(SIGKILL);
6656 while (!kthread_should_stop()) {
6658 /* We need to wait INTERRUPTIBLE so that
6659 * we don't add to the load-average.
6660 * That means we need to be sure no signals are
6663 if (signal_pending(current))
6664 flush_signals(current);
6666 wait_event_interruptible_timeout
6668 test_bit(THREAD_WAKEUP, &thread->flags)
6669 || kthread_should_stop(),
6672 clear_bit(THREAD_WAKEUP, &thread->flags);
6673 if (!kthread_should_stop())
6674 thread->run(thread);
6680 void md_wakeup_thread(struct md_thread *thread)
6683 pr_debug("md: waking up MD thread %s.\n", thread->tsk->comm);
6684 set_bit(THREAD_WAKEUP, &thread->flags);
6685 wake_up(&thread->wqueue);
6688 EXPORT_SYMBOL(md_wakeup_thread);
6690 struct md_thread *md_register_thread(void (*run) (struct md_thread *),
6691 struct mddev *mddev, const char *name)
6693 struct md_thread *thread;
6695 thread = kzalloc(sizeof(struct md_thread), GFP_KERNEL);
6699 init_waitqueue_head(&thread->wqueue);
6702 thread->mddev = mddev;
6703 thread->timeout = MAX_SCHEDULE_TIMEOUT;
6704 thread->tsk = kthread_run(md_thread, thread,
6706 mdname(thread->mddev),
6708 if (IS_ERR(thread->tsk)) {
6714 EXPORT_SYMBOL(md_register_thread);
6716 void md_unregister_thread(struct md_thread **threadp)
6718 struct md_thread *thread = *threadp;
6721 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
6722 /* Locking ensures that mddev_unlock does not wake_up a
6723 * non-existent thread
6725 spin_lock(&pers_lock);
6727 spin_unlock(&pers_lock);
6729 kthread_stop(thread->tsk);
6732 EXPORT_SYMBOL(md_unregister_thread);
6734 void md_error(struct mddev *mddev, struct md_rdev *rdev)
6736 if (!rdev || test_bit(Faulty, &rdev->flags))
6739 if (!mddev->pers || !mddev->pers->error_handler)
6741 mddev->pers->error_handler(mddev,rdev);
6742 if (mddev->degraded)
6743 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6744 sysfs_notify_dirent_safe(rdev->sysfs_state);
6745 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6746 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6747 md_wakeup_thread(mddev->thread);
6748 if (mddev->event_work.func)
6749 queue_work(md_misc_wq, &mddev->event_work);
6750 md_new_event_inintr(mddev);
6752 EXPORT_SYMBOL(md_error);
6754 /* seq_file implementation /proc/mdstat */
6756 static void status_unused(struct seq_file *seq)
6759 struct md_rdev *rdev;
6761 seq_printf(seq, "unused devices: ");
6763 list_for_each_entry(rdev, &pending_raid_disks, same_set) {
6764 char b[BDEVNAME_SIZE];
6766 seq_printf(seq, "%s ",
6767 bdevname(rdev->bdev,b));
6770 seq_printf(seq, "<none>");
6772 seq_printf(seq, "\n");
6775 static void status_resync(struct seq_file *seq, struct mddev *mddev)
6777 sector_t max_sectors, resync, res;
6778 unsigned long dt, db;
6781 unsigned int per_milli;
6783 if (mddev->curr_resync <= 3)
6786 resync = mddev->curr_resync
6787 - atomic_read(&mddev->recovery_active);
6789 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
6790 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
6791 max_sectors = mddev->resync_max_sectors;
6793 max_sectors = mddev->dev_sectors;
6795 WARN_ON(max_sectors == 0);
6796 /* Pick 'scale' such that (resync>>scale)*1000 will fit
6797 * in a sector_t, and (max_sectors>>scale) will fit in a
6798 * u32, as those are the requirements for sector_div.
6799 * Thus 'scale' must be at least 10
6802 if (sizeof(sector_t) > sizeof(unsigned long)) {
6803 while ( max_sectors/2 > (1ULL<<(scale+32)))
6806 res = (resync>>scale)*1000;
6807 sector_div(res, (u32)((max_sectors>>scale)+1));
6811 int i, x = per_milli/50, y = 20-x;
6812 seq_printf(seq, "[");
6813 for (i = 0; i < x; i++)
6814 seq_printf(seq, "=");
6815 seq_printf(seq, ">");
6816 for (i = 0; i < y; i++)
6817 seq_printf(seq, ".");
6818 seq_printf(seq, "] ");
6820 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
6821 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
6823 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
6825 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
6826 "resync" : "recovery"))),
6827 per_milli/10, per_milli % 10,
6828 (unsigned long long) resync/2,
6829 (unsigned long long) max_sectors/2);
6832 * dt: time from mark until now
6833 * db: blocks written from mark until now
6834 * rt: remaining time
6836 * rt is a sector_t, so could be 32bit or 64bit.
6837 * So we divide before multiply in case it is 32bit and close
6839 * We scale the divisor (db) by 32 to avoid losing precision
6840 * near the end of resync when the number of remaining sectors
6842 * We then divide rt by 32 after multiplying by db to compensate.
6843 * The '+1' avoids division by zero if db is very small.
6845 dt = ((jiffies - mddev->resync_mark) / HZ);
6847 db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active))
6848 - mddev->resync_mark_cnt;
6850 rt = max_sectors - resync; /* number of remaining sectors */
6851 sector_div(rt, db/32+1);
6855 seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60,
6856 ((unsigned long)rt % 60)/6);
6858 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
6861 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
6863 struct list_head *tmp;
6865 struct mddev *mddev;
6873 spin_lock(&all_mddevs_lock);
6874 list_for_each(tmp,&all_mddevs)
6876 mddev = list_entry(tmp, struct mddev, all_mddevs);
6878 spin_unlock(&all_mddevs_lock);
6881 spin_unlock(&all_mddevs_lock);
6883 return (void*)2;/* tail */
6887 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
6889 struct list_head *tmp;
6890 struct mddev *next_mddev, *mddev = v;
6896 spin_lock(&all_mddevs_lock);
6898 tmp = all_mddevs.next;
6900 tmp = mddev->all_mddevs.next;
6901 if (tmp != &all_mddevs)
6902 next_mddev = mddev_get(list_entry(tmp,struct mddev,all_mddevs));
6904 next_mddev = (void*)2;
6907 spin_unlock(&all_mddevs_lock);
6915 static void md_seq_stop(struct seq_file *seq, void *v)
6917 struct mddev *mddev = v;
6919 if (mddev && v != (void*)1 && v != (void*)2)
6923 static int md_seq_show(struct seq_file *seq, void *v)
6925 struct mddev *mddev = v;
6927 struct md_rdev *rdev;
6929 if (v == (void*)1) {
6930 struct md_personality *pers;
6931 seq_printf(seq, "Personalities : ");
6932 spin_lock(&pers_lock);
6933 list_for_each_entry(pers, &pers_list, list)
6934 seq_printf(seq, "[%s] ", pers->name);
6936 spin_unlock(&pers_lock);
6937 seq_printf(seq, "\n");
6938 seq->poll_event = atomic_read(&md_event_count);
6941 if (v == (void*)2) {
6946 spin_lock(&mddev->lock);
6947 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
6948 seq_printf(seq, "%s : %sactive", mdname(mddev),
6949 mddev->pers ? "" : "in");
6952 seq_printf(seq, " (read-only)");
6954 seq_printf(seq, " (auto-read-only)");
6955 seq_printf(seq, " %s", mddev->pers->name);
6960 rdev_for_each_rcu(rdev, mddev) {
6961 char b[BDEVNAME_SIZE];
6962 seq_printf(seq, " %s[%d]",
6963 bdevname(rdev->bdev,b), rdev->desc_nr);
6964 if (test_bit(WriteMostly, &rdev->flags))
6965 seq_printf(seq, "(W)");
6966 if (test_bit(Faulty, &rdev->flags)) {
6967 seq_printf(seq, "(F)");
6970 if (rdev->raid_disk < 0)
6971 seq_printf(seq, "(S)"); /* spare */
6972 if (test_bit(Replacement, &rdev->flags))
6973 seq_printf(seq, "(R)");
6974 sectors += rdev->sectors;
6978 if (!list_empty(&mddev->disks)) {
6980 seq_printf(seq, "\n %llu blocks",
6981 (unsigned long long)
6982 mddev->array_sectors / 2);
6984 seq_printf(seq, "\n %llu blocks",
6985 (unsigned long long)sectors / 2);
6987 if (mddev->persistent) {
6988 if (mddev->major_version != 0 ||
6989 mddev->minor_version != 90) {
6990 seq_printf(seq," super %d.%d",
6991 mddev->major_version,
6992 mddev->minor_version);
6994 } else if (mddev->external)
6995 seq_printf(seq, " super external:%s",
6996 mddev->metadata_type);
6998 seq_printf(seq, " super non-persistent");
7001 mddev->pers->status(seq, mddev);
7002 seq_printf(seq, "\n ");
7003 if (mddev->pers->sync_request) {
7004 if (mddev->curr_resync > 2) {
7005 status_resync(seq, mddev);
7006 seq_printf(seq, "\n ");
7007 } else if (mddev->curr_resync >= 1)
7008 seq_printf(seq, "\tresync=DELAYED\n ");
7009 else if (mddev->recovery_cp < MaxSector)
7010 seq_printf(seq, "\tresync=PENDING\n ");
7013 seq_printf(seq, "\n ");
7015 bitmap_status(seq, mddev->bitmap);
7017 seq_printf(seq, "\n");
7019 spin_unlock(&mddev->lock);
7024 static const struct seq_operations md_seq_ops = {
7025 .start = md_seq_start,
7026 .next = md_seq_next,
7027 .stop = md_seq_stop,
7028 .show = md_seq_show,
7031 static int md_seq_open(struct inode *inode, struct file *file)
7033 struct seq_file *seq;
7036 error = seq_open(file, &md_seq_ops);
7040 seq = file->private_data;
7041 seq->poll_event = atomic_read(&md_event_count);
7045 static int md_unloading;
7046 static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
7048 struct seq_file *seq = filp->private_data;
7052 return POLLIN|POLLRDNORM|POLLERR|POLLPRI;
7053 poll_wait(filp, &md_event_waiters, wait);
7055 /* always allow read */
7056 mask = POLLIN | POLLRDNORM;
7058 if (seq->poll_event != atomic_read(&md_event_count))
7059 mask |= POLLERR | POLLPRI;
7063 static const struct file_operations md_seq_fops = {
7064 .owner = THIS_MODULE,
7065 .open = md_seq_open,
7067 .llseek = seq_lseek,
7068 .release = seq_release_private,
7069 .poll = mdstat_poll,
7072 int register_md_personality(struct md_personality *p)
7074 printk(KERN_INFO "md: %s personality registered for level %d\n",
7076 spin_lock(&pers_lock);
7077 list_add_tail(&p->list, &pers_list);
7078 spin_unlock(&pers_lock);
7081 EXPORT_SYMBOL(register_md_personality);
7083 int unregister_md_personality(struct md_personality *p)
7085 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
7086 spin_lock(&pers_lock);
7087 list_del_init(&p->list);
7088 spin_unlock(&pers_lock);
7091 EXPORT_SYMBOL(unregister_md_personality);
7093 static int is_mddev_idle(struct mddev *mddev, int init)
7095 struct md_rdev *rdev;
7101 rdev_for_each_rcu(rdev, mddev) {
7102 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
7103 curr_events = (int)part_stat_read(&disk->part0, sectors[0]) +
7104 (int)part_stat_read(&disk->part0, sectors[1]) -
7105 atomic_read(&disk->sync_io);
7106 /* sync IO will cause sync_io to increase before the disk_stats
7107 * as sync_io is counted when a request starts, and
7108 * disk_stats is counted when it completes.
7109 * So resync activity will cause curr_events to be smaller than
7110 * when there was no such activity.
7111 * non-sync IO will cause disk_stat to increase without
7112 * increasing sync_io so curr_events will (eventually)
7113 * be larger than it was before. Once it becomes
7114 * substantially larger, the test below will cause
7115 * the array to appear non-idle, and resync will slow
7117 * If there is a lot of outstanding resync activity when
7118 * we set last_event to curr_events, then all that activity
7119 * completing might cause the array to appear non-idle
7120 * and resync will be slowed down even though there might
7121 * not have been non-resync activity. This will only
7122 * happen once though. 'last_events' will soon reflect
7123 * the state where there is little or no outstanding
7124 * resync requests, and further resync activity will
7125 * always make curr_events less than last_events.
7128 if (init || curr_events - rdev->last_events > 64) {
7129 rdev->last_events = curr_events;
7137 void md_done_sync(struct mddev *mddev, int blocks, int ok)
7139 /* another "blocks" (512byte) blocks have been synced */
7140 atomic_sub(blocks, &mddev->recovery_active);
7141 wake_up(&mddev->recovery_wait);
7143 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7144 set_bit(MD_RECOVERY_ERROR, &mddev->recovery);
7145 md_wakeup_thread(mddev->thread);
7146 // stop recovery, signal do_sync ....
7149 EXPORT_SYMBOL(md_done_sync);
7151 /* md_write_start(mddev, bi)
7152 * If we need to update some array metadata (e.g. 'active' flag
7153 * in superblock) before writing, schedule a superblock update
7154 * and wait for it to complete.
7156 void md_write_start(struct mddev *mddev, struct bio *bi)
7159 if (bio_data_dir(bi) != WRITE)
7162 BUG_ON(mddev->ro == 1);
7163 if (mddev->ro == 2) {
7164 /* need to switch to read/write */
7166 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7167 md_wakeup_thread(mddev->thread);
7168 md_wakeup_thread(mddev->sync_thread);
7171 atomic_inc(&mddev->writes_pending);
7172 if (mddev->safemode == 1)
7173 mddev->safemode = 0;
7174 if (mddev->in_sync) {
7175 spin_lock(&mddev->lock);
7176 if (mddev->in_sync) {
7178 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
7179 set_bit(MD_CHANGE_PENDING, &mddev->flags);
7180 md_wakeup_thread(mddev->thread);
7183 spin_unlock(&mddev->lock);
7186 sysfs_notify_dirent_safe(mddev->sysfs_state);
7187 wait_event(mddev->sb_wait,
7188 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
7190 EXPORT_SYMBOL(md_write_start);
7192 void md_write_end(struct mddev *mddev)
7194 if (atomic_dec_and_test(&mddev->writes_pending)) {
7195 if (mddev->safemode == 2)
7196 md_wakeup_thread(mddev->thread);
7197 else if (mddev->safemode_delay)
7198 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
7201 EXPORT_SYMBOL(md_write_end);
7203 /* md_allow_write(mddev)
7204 * Calling this ensures that the array is marked 'active' so that writes
7205 * may proceed without blocking. It is important to call this before
7206 * attempting a GFP_KERNEL allocation while holding the mddev lock.
7207 * Must be called with mddev_lock held.
7209 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
7210 * is dropped, so return -EAGAIN after notifying userspace.
7212 int md_allow_write(struct mddev *mddev)
7218 if (!mddev->pers->sync_request)
7221 spin_lock(&mddev->lock);
7222 if (mddev->in_sync) {
7224 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
7225 set_bit(MD_CHANGE_PENDING, &mddev->flags);
7226 if (mddev->safemode_delay &&
7227 mddev->safemode == 0)
7228 mddev->safemode = 1;
7229 spin_unlock(&mddev->lock);
7230 md_update_sb(mddev, 0);
7231 sysfs_notify_dirent_safe(mddev->sysfs_state);
7233 spin_unlock(&mddev->lock);
7235 if (test_bit(MD_CHANGE_PENDING, &mddev->flags))
7240 EXPORT_SYMBOL_GPL(md_allow_write);
7242 #define SYNC_MARKS 10
7243 #define SYNC_MARK_STEP (3*HZ)
7244 #define UPDATE_FREQUENCY (5*60*HZ)
7245 void md_do_sync(struct md_thread *thread)
7247 struct mddev *mddev = thread->mddev;
7248 struct mddev *mddev2;
7249 unsigned int currspeed = 0,
7251 sector_t max_sectors,j, io_sectors, recovery_done;
7252 unsigned long mark[SYNC_MARKS];
7253 unsigned long update_time;
7254 sector_t mark_cnt[SYNC_MARKS];
7256 struct list_head *tmp;
7257 sector_t last_check;
7259 struct md_rdev *rdev;
7260 char *desc, *action = NULL;
7261 struct blk_plug plug;
7263 /* just incase thread restarts... */
7264 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
7266 if (mddev->ro) {/* never try to sync a read-only array */
7267 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7271 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
7272 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) {
7273 desc = "data-check";
7275 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
7276 desc = "requested-resync";
7280 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
7285 mddev->last_sync_action = action ?: desc;
7287 /* we overload curr_resync somewhat here.
7288 * 0 == not engaged in resync at all
7289 * 2 == checking that there is no conflict with another sync
7290 * 1 == like 2, but have yielded to allow conflicting resync to
7292 * other == active in resync - this many blocks
7294 * Before starting a resync we must have set curr_resync to
7295 * 2, and then checked that every "conflicting" array has curr_resync
7296 * less than ours. When we find one that is the same or higher
7297 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
7298 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
7299 * This will mean we have to start checking from the beginning again.
7304 mddev->curr_resync = 2;
7307 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
7309 for_each_mddev(mddev2, tmp) {
7310 if (mddev2 == mddev)
7312 if (!mddev->parallel_resync
7313 && mddev2->curr_resync
7314 && match_mddev_units(mddev, mddev2)) {
7316 if (mddev < mddev2 && mddev->curr_resync == 2) {
7317 /* arbitrarily yield */
7318 mddev->curr_resync = 1;
7319 wake_up(&resync_wait);
7321 if (mddev > mddev2 && mddev->curr_resync == 1)
7322 /* no need to wait here, we can wait the next
7323 * time 'round when curr_resync == 2
7326 /* We need to wait 'interruptible' so as not to
7327 * contribute to the load average, and not to
7328 * be caught by 'softlockup'
7330 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
7331 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
7332 mddev2->curr_resync >= mddev->curr_resync) {
7333 printk(KERN_INFO "md: delaying %s of %s"
7334 " until %s has finished (they"
7335 " share one or more physical units)\n",
7336 desc, mdname(mddev), mdname(mddev2));
7338 if (signal_pending(current))
7339 flush_signals(current);
7341 finish_wait(&resync_wait, &wq);
7344 finish_wait(&resync_wait, &wq);
7347 } while (mddev->curr_resync < 2);
7350 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
7351 /* resync follows the size requested by the personality,
7352 * which defaults to physical size, but can be virtual size
7354 max_sectors = mddev->resync_max_sectors;
7355 atomic64_set(&mddev->resync_mismatches, 0);
7356 /* we don't use the checkpoint if there's a bitmap */
7357 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
7358 j = mddev->resync_min;
7359 else if (!mddev->bitmap)
7360 j = mddev->recovery_cp;
7362 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
7363 max_sectors = mddev->resync_max_sectors;
7365 /* recovery follows the physical size of devices */
7366 max_sectors = mddev->dev_sectors;
7369 rdev_for_each_rcu(rdev, mddev)
7370 if (rdev->raid_disk >= 0 &&
7371 !test_bit(Faulty, &rdev->flags) &&
7372 !test_bit(In_sync, &rdev->flags) &&
7373 rdev->recovery_offset < j)
7374 j = rdev->recovery_offset;
7377 /* If there is a bitmap, we need to make sure all
7378 * writes that started before we added a spare
7379 * complete before we start doing a recovery.
7380 * Otherwise the write might complete and (via
7381 * bitmap_endwrite) set a bit in the bitmap after the
7382 * recovery has checked that bit and skipped that
7385 if (mddev->bitmap) {
7386 mddev->pers->quiesce(mddev, 1);
7387 mddev->pers->quiesce(mddev, 0);
7391 printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev));
7392 printk(KERN_INFO "md: minimum _guaranteed_ speed:"
7393 " %d KB/sec/disk.\n", speed_min(mddev));
7394 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
7395 "(but not more than %d KB/sec) for %s.\n",
7396 speed_max(mddev), desc);
7398 is_mddev_idle(mddev, 1); /* this initializes IO event counters */
7401 for (m = 0; m < SYNC_MARKS; m++) {
7403 mark_cnt[m] = io_sectors;
7406 mddev->resync_mark = mark[last_mark];
7407 mddev->resync_mark_cnt = mark_cnt[last_mark];
7410 * Tune reconstruction:
7412 window = 32*(PAGE_SIZE/512);
7413 printk(KERN_INFO "md: using %dk window, over a total of %lluk.\n",
7414 window/2, (unsigned long long)max_sectors/2);
7416 atomic_set(&mddev->recovery_active, 0);
7421 "md: resuming %s of %s from checkpoint.\n",
7422 desc, mdname(mddev));
7423 mddev->curr_resync = j;
7425 mddev->curr_resync = 3; /* no longer delayed */
7426 mddev->curr_resync_completed = j;
7427 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
7428 md_new_event(mddev);
7429 update_time = jiffies;
7431 blk_start_plug(&plug);
7432 while (j < max_sectors) {
7437 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
7438 ((mddev->curr_resync > mddev->curr_resync_completed &&
7439 (mddev->curr_resync - mddev->curr_resync_completed)
7440 > (max_sectors >> 4)) ||
7441 time_after_eq(jiffies, update_time + UPDATE_FREQUENCY) ||
7442 (j - mddev->curr_resync_completed)*2
7443 >= mddev->resync_max - mddev->curr_resync_completed
7445 /* time to update curr_resync_completed */
7446 wait_event(mddev->recovery_wait,
7447 atomic_read(&mddev->recovery_active) == 0);
7448 mddev->curr_resync_completed = j;
7449 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) &&
7450 j > mddev->recovery_cp)
7451 mddev->recovery_cp = j;
7452 update_time = jiffies;
7453 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
7454 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
7457 while (j >= mddev->resync_max &&
7458 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
7459 /* As this condition is controlled by user-space,
7460 * we can block indefinitely, so use '_interruptible'
7461 * to avoid triggering warnings.
7463 flush_signals(current); /* just in case */
7464 wait_event_interruptible(mddev->recovery_wait,
7465 mddev->resync_max > j
7466 || test_bit(MD_RECOVERY_INTR,
7470 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
7473 sectors = mddev->pers->sync_request(mddev, j, &skipped,
7474 currspeed < speed_min(mddev));
7476 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7480 if (!skipped) { /* actual IO requested */
7481 io_sectors += sectors;
7482 atomic_add(sectors, &mddev->recovery_active);
7485 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
7490 mddev->curr_resync = j;
7491 mddev->curr_mark_cnt = io_sectors;
7492 if (last_check == 0)
7493 /* this is the earliest that rebuild will be
7494 * visible in /proc/mdstat
7496 md_new_event(mddev);
7498 if (last_check + window > io_sectors || j == max_sectors)
7501 last_check = io_sectors;
7503 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
7505 int next = (last_mark+1) % SYNC_MARKS;
7507 mddev->resync_mark = mark[next];
7508 mddev->resync_mark_cnt = mark_cnt[next];
7509 mark[next] = jiffies;
7510 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
7514 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
7518 * this loop exits only if either when we are slower than
7519 * the 'hard' speed limit, or the system was IO-idle for
7521 * the system might be non-idle CPU-wise, but we only care
7522 * about not overloading the IO subsystem. (things like an
7523 * e2fsck being done on the RAID array should execute fast)
7527 recovery_done = io_sectors - atomic_read(&mddev->recovery_active);
7528 currspeed = ((unsigned long)(recovery_done - mddev->resync_mark_cnt))/2
7529 /((jiffies-mddev->resync_mark)/HZ +1) +1;
7531 if (currspeed > speed_min(mddev)) {
7532 if ((currspeed > speed_max(mddev)) ||
7533 !is_mddev_idle(mddev, 0)) {
7539 printk(KERN_INFO "md: %s: %s %s.\n",mdname(mddev), desc,
7540 test_bit(MD_RECOVERY_INTR, &mddev->recovery)
7541 ? "interrupted" : "done");
7543 * this also signals 'finished resyncing' to md_stop
7545 blk_finish_plug(&plug);
7546 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
7548 /* tell personality that we are finished */
7549 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
7551 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
7552 mddev->curr_resync > 2) {
7553 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
7554 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
7555 if (mddev->curr_resync >= mddev->recovery_cp) {
7557 "md: checkpointing %s of %s.\n",
7558 desc, mdname(mddev));
7559 if (test_bit(MD_RECOVERY_ERROR,
7561 mddev->recovery_cp =
7562 mddev->curr_resync_completed;
7564 mddev->recovery_cp =
7568 mddev->recovery_cp = MaxSector;
7570 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
7571 mddev->curr_resync = MaxSector;
7573 rdev_for_each_rcu(rdev, mddev)
7574 if (rdev->raid_disk >= 0 &&
7575 mddev->delta_disks >= 0 &&
7576 !test_bit(Faulty, &rdev->flags) &&
7577 !test_bit(In_sync, &rdev->flags) &&
7578 rdev->recovery_offset < mddev->curr_resync)
7579 rdev->recovery_offset = mddev->curr_resync;
7584 set_bit(MD_CHANGE_DEVS, &mddev->flags);
7586 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
7587 /* We completed so min/max setting can be forgotten if used. */
7588 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
7589 mddev->resync_min = 0;
7590 mddev->resync_max = MaxSector;
7591 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
7592 mddev->resync_min = mddev->curr_resync_completed;
7593 mddev->curr_resync = 0;
7594 wake_up(&resync_wait);
7595 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
7596 md_wakeup_thread(mddev->thread);
7599 EXPORT_SYMBOL_GPL(md_do_sync);
7601 static int remove_and_add_spares(struct mddev *mddev,
7602 struct md_rdev *this)
7604 struct md_rdev *rdev;
7608 rdev_for_each(rdev, mddev)
7609 if ((this == NULL || rdev == this) &&
7610 rdev->raid_disk >= 0 &&
7611 !test_bit(Blocked, &rdev->flags) &&
7612 (test_bit(Faulty, &rdev->flags) ||
7613 ! test_bit(In_sync, &rdev->flags)) &&
7614 atomic_read(&rdev->nr_pending)==0) {
7615 if (mddev->pers->hot_remove_disk(
7616 mddev, rdev) == 0) {
7617 sysfs_unlink_rdev(mddev, rdev);
7618 rdev->raid_disk = -1;
7622 if (removed && mddev->kobj.sd)
7623 sysfs_notify(&mddev->kobj, NULL, "degraded");
7628 rdev_for_each(rdev, mddev) {
7629 if (rdev->raid_disk >= 0 &&
7630 !test_bit(In_sync, &rdev->flags) &&
7631 !test_bit(Faulty, &rdev->flags))
7633 if (rdev->raid_disk >= 0)
7635 if (test_bit(Faulty, &rdev->flags))
7638 ! (rdev->saved_raid_disk >= 0 &&
7639 !test_bit(Bitmap_sync, &rdev->flags)))
7642 if (rdev->saved_raid_disk < 0)
7643 rdev->recovery_offset = 0;
7645 hot_add_disk(mddev, rdev) == 0) {
7646 if (sysfs_link_rdev(mddev, rdev))
7647 /* failure here is OK */;
7649 md_new_event(mddev);
7650 set_bit(MD_CHANGE_DEVS, &mddev->flags);
7655 set_bit(MD_CHANGE_DEVS, &mddev->flags);
7659 static void md_start_sync(struct work_struct *ws)
7661 struct mddev *mddev = container_of(ws, struct mddev, del_work);
7663 mddev->sync_thread = md_register_thread(md_do_sync,
7666 if (!mddev->sync_thread) {
7667 printk(KERN_ERR "%s: could not start resync"
7670 /* leave the spares where they are, it shouldn't hurt */
7671 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7672 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
7673 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
7674 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
7675 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7676 wake_up(&resync_wait);
7677 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
7679 if (mddev->sysfs_action)
7680 sysfs_notify_dirent_safe(mddev->sysfs_action);
7682 md_wakeup_thread(mddev->sync_thread);
7683 sysfs_notify_dirent_safe(mddev->sysfs_action);
7684 md_new_event(mddev);
7688 * This routine is regularly called by all per-raid-array threads to
7689 * deal with generic issues like resync and super-block update.
7690 * Raid personalities that don't have a thread (linear/raid0) do not
7691 * need this as they never do any recovery or update the superblock.
7693 * It does not do any resync itself, but rather "forks" off other threads
7694 * to do that as needed.
7695 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
7696 * "->recovery" and create a thread at ->sync_thread.
7697 * When the thread finishes it sets MD_RECOVERY_DONE
7698 * and wakeups up this thread which will reap the thread and finish up.
7699 * This thread also removes any faulty devices (with nr_pending == 0).
7701 * The overall approach is:
7702 * 1/ if the superblock needs updating, update it.
7703 * 2/ If a recovery thread is running, don't do anything else.
7704 * 3/ If recovery has finished, clean up, possibly marking spares active.
7705 * 4/ If there are any faulty devices, remove them.
7706 * 5/ If array is degraded, try to add spares devices
7707 * 6/ If array has spares or is not in-sync, start a resync thread.
7709 void md_check_recovery(struct mddev *mddev)
7711 if (mddev->suspended)
7715 bitmap_daemon_work(mddev);
7717 if (signal_pending(current)) {
7718 if (mddev->pers->sync_request && !mddev->external) {
7719 printk(KERN_INFO "md: %s in immediate safe mode\n",
7721 mddev->safemode = 2;
7723 flush_signals(current);
7726 if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
7729 (mddev->flags & MD_UPDATE_SB_FLAGS & ~ (1<<MD_CHANGE_PENDING)) ||
7730 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
7731 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
7732 (mddev->external == 0 && mddev->safemode == 1) ||
7733 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
7734 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
7738 if (mddev_trylock(mddev)) {
7742 /* On a read-only array we can:
7743 * - remove failed devices
7744 * - add already-in_sync devices if the array itself
7746 * As we only add devices that are already in-sync,
7747 * we can activate the spares immediately.
7749 remove_and_add_spares(mddev, NULL);
7750 /* There is no thread, but we need to call
7751 * ->spare_active and clear saved_raid_disk
7753 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7754 md_reap_sync_thread(mddev);
7755 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7759 if (!mddev->external) {
7761 spin_lock(&mddev->lock);
7762 if (mddev->safemode &&
7763 !atomic_read(&mddev->writes_pending) &&
7765 mddev->recovery_cp == MaxSector) {
7768 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
7770 if (mddev->safemode == 1)
7771 mddev->safemode = 0;
7772 spin_unlock(&mddev->lock);
7774 sysfs_notify_dirent_safe(mddev->sysfs_state);
7777 if (mddev->flags & MD_UPDATE_SB_FLAGS)
7778 md_update_sb(mddev, 0);
7780 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
7781 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
7782 /* resync/recovery still happening */
7783 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7786 if (mddev->sync_thread) {
7787 md_reap_sync_thread(mddev);
7790 /* Set RUNNING before clearing NEEDED to avoid
7791 * any transients in the value of "sync_action".
7793 mddev->curr_resync_completed = 0;
7794 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7795 /* Clear some bits that don't mean anything, but
7798 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
7799 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
7801 if (!test_and_clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
7802 test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
7804 /* no recovery is running.
7805 * remove any failed drives, then
7806 * add spares if possible.
7807 * Spares are also removed and re-added, to allow
7808 * the personality to fail the re-add.
7811 if (mddev->reshape_position != MaxSector) {
7812 if (mddev->pers->check_reshape == NULL ||
7813 mddev->pers->check_reshape(mddev) != 0)
7814 /* Cannot proceed */
7816 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
7817 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7818 } else if ((spares = remove_and_add_spares(mddev, NULL))) {
7819 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7820 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
7821 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
7822 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7823 } else if (mddev->recovery_cp < MaxSector) {
7824 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7825 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7826 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
7827 /* nothing to be done ... */
7830 if (mddev->pers->sync_request) {
7832 /* We are adding a device or devices to an array
7833 * which has the bitmap stored on all devices.
7834 * So make sure all bitmap pages get written
7836 bitmap_write_all(mddev->bitmap);
7838 INIT_WORK(&mddev->del_work, md_start_sync);
7839 queue_work(md_misc_wq, &mddev->del_work);
7843 if (!mddev->sync_thread) {
7844 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7845 wake_up(&resync_wait);
7846 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
7848 if (mddev->sysfs_action)
7849 sysfs_notify_dirent_safe(mddev->sysfs_action);
7852 wake_up(&mddev->sb_wait);
7853 mddev_unlock(mddev);
7856 EXPORT_SYMBOL(md_check_recovery);
7858 void md_reap_sync_thread(struct mddev *mddev)
7860 struct md_rdev *rdev;
7862 /* resync has finished, collect result */
7863 md_unregister_thread(&mddev->sync_thread);
7864 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
7865 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
7867 /* activate any spares */
7868 if (mddev->pers->spare_active(mddev)) {
7869 sysfs_notify(&mddev->kobj, NULL,
7871 set_bit(MD_CHANGE_DEVS, &mddev->flags);
7874 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
7875 mddev->pers->finish_reshape)
7876 mddev->pers->finish_reshape(mddev);
7878 /* If array is no-longer degraded, then any saved_raid_disk
7879 * information must be scrapped.
7881 if (!mddev->degraded)
7882 rdev_for_each(rdev, mddev)
7883 rdev->saved_raid_disk = -1;
7885 md_update_sb(mddev, 1);
7886 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7887 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7888 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
7889 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
7890 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
7891 wake_up(&resync_wait);
7892 /* flag recovery needed just to double check */
7893 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7894 sysfs_notify_dirent_safe(mddev->sysfs_action);
7895 md_new_event(mddev);
7896 if (mddev->event_work.func)
7897 queue_work(md_misc_wq, &mddev->event_work);
7899 EXPORT_SYMBOL(md_reap_sync_thread);
7901 void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev)
7903 sysfs_notify_dirent_safe(rdev->sysfs_state);
7904 wait_event_timeout(rdev->blocked_wait,
7905 !test_bit(Blocked, &rdev->flags) &&
7906 !test_bit(BlockedBadBlocks, &rdev->flags),
7907 msecs_to_jiffies(5000));
7908 rdev_dec_pending(rdev, mddev);
7910 EXPORT_SYMBOL(md_wait_for_blocked_rdev);
7912 void md_finish_reshape(struct mddev *mddev)
7914 /* called be personality module when reshape completes. */
7915 struct md_rdev *rdev;
7917 rdev_for_each(rdev, mddev) {
7918 if (rdev->data_offset > rdev->new_data_offset)
7919 rdev->sectors += rdev->data_offset - rdev->new_data_offset;
7921 rdev->sectors -= rdev->new_data_offset - rdev->data_offset;
7922 rdev->data_offset = rdev->new_data_offset;
7925 EXPORT_SYMBOL(md_finish_reshape);
7927 /* Bad block management.
7928 * We can record which blocks on each device are 'bad' and so just
7929 * fail those blocks, or that stripe, rather than the whole device.
7930 * Entries in the bad-block table are 64bits wide. This comprises:
7931 * Length of bad-range, in sectors: 0-511 for lengths 1-512
7932 * Start of bad-range, sector offset, 54 bits (allows 8 exbibytes)
7933 * A 'shift' can be set so that larger blocks are tracked and
7934 * consequently larger devices can be covered.
7935 * 'Acknowledged' flag - 1 bit. - the most significant bit.
7937 * Locking of the bad-block table uses a seqlock so md_is_badblock
7938 * might need to retry if it is very unlucky.
7939 * We will sometimes want to check for bad blocks in a bi_end_io function,
7940 * so we use the write_seqlock_irq variant.
7942 * When looking for a bad block we specify a range and want to
7943 * know if any block in the range is bad. So we binary-search
7944 * to the last range that starts at-or-before the given endpoint,
7945 * (or "before the sector after the target range")
7946 * then see if it ends after the given start.
7948 * 0 if there are no known bad blocks in the range
7949 * 1 if there are known bad block which are all acknowledged
7950 * -1 if there are bad blocks which have not yet been acknowledged in metadata.
7951 * plus the start/length of the first bad section we overlap.
7953 int md_is_badblock(struct badblocks *bb, sector_t s, int sectors,
7954 sector_t *first_bad, int *bad_sectors)
7960 sector_t target = s + sectors;
7963 if (bb->shift > 0) {
7964 /* round the start down, and the end up */
7966 target += (1<<bb->shift) - 1;
7967 target >>= bb->shift;
7968 sectors = target - s;
7970 /* 'target' is now the first block after the bad range */
7973 seq = read_seqbegin(&bb->lock);
7978 /* Binary search between lo and hi for 'target'
7979 * i.e. for the last range that starts before 'target'
7981 /* INVARIANT: ranges before 'lo' and at-or-after 'hi'
7982 * are known not to be the last range before target.
7983 * VARIANT: hi-lo is the number of possible
7984 * ranges, and decreases until it reaches 1
7986 while (hi - lo > 1) {
7987 int mid = (lo + hi) / 2;
7988 sector_t a = BB_OFFSET(p[mid]);
7990 /* This could still be the one, earlier ranges
7994 /* This and later ranges are definitely out. */
7997 /* 'lo' might be the last that started before target, but 'hi' isn't */
7999 /* need to check all range that end after 's' to see if
8000 * any are unacknowledged.
8003 BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) {
8004 if (BB_OFFSET(p[lo]) < target) {
8005 /* starts before the end, and finishes after
8006 * the start, so they must overlap
8008 if (rv != -1 && BB_ACK(p[lo]))
8012 *first_bad = BB_OFFSET(p[lo]);
8013 *bad_sectors = BB_LEN(p[lo]);
8019 if (read_seqretry(&bb->lock, seq))
8024 EXPORT_SYMBOL_GPL(md_is_badblock);
8027 * Add a range of bad blocks to the table.
8028 * This might extend the table, or might contract it
8029 * if two adjacent ranges can be merged.
8030 * We binary-search to find the 'insertion' point, then
8031 * decide how best to handle it.
8033 static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors,
8039 unsigned long flags;
8042 /* badblocks are disabled */
8046 /* round the start down, and the end up */
8047 sector_t next = s + sectors;
8049 next += (1<<bb->shift) - 1;
8054 write_seqlock_irqsave(&bb->lock, flags);
8059 /* Find the last range that starts at-or-before 's' */
8060 while (hi - lo > 1) {
8061 int mid = (lo + hi) / 2;
8062 sector_t a = BB_OFFSET(p[mid]);
8068 if (hi > lo && BB_OFFSET(p[lo]) > s)
8072 /* we found a range that might merge with the start
8075 sector_t a = BB_OFFSET(p[lo]);
8076 sector_t e = a + BB_LEN(p[lo]);
8077 int ack = BB_ACK(p[lo]);
8079 /* Yes, we can merge with a previous range */
8080 if (s == a && s + sectors >= e)
8081 /* new range covers old */
8084 ack = ack && acknowledged;
8086 if (e < s + sectors)
8088 if (e - a <= BB_MAX_LEN) {
8089 p[lo] = BB_MAKE(a, e-a, ack);
8092 /* does not all fit in one range,
8093 * make p[lo] maximal
8095 if (BB_LEN(p[lo]) != BB_MAX_LEN)
8096 p[lo] = BB_MAKE(a, BB_MAX_LEN, ack);
8102 if (sectors && hi < bb->count) {
8103 /* 'hi' points to the first range that starts after 's'.
8104 * Maybe we can merge with the start of that range */
8105 sector_t a = BB_OFFSET(p[hi]);
8106 sector_t e = a + BB_LEN(p[hi]);
8107 int ack = BB_ACK(p[hi]);
8108 if (a <= s + sectors) {
8109 /* merging is possible */
8110 if (e <= s + sectors) {
8115 ack = ack && acknowledged;
8118 if (e - a <= BB_MAX_LEN) {
8119 p[hi] = BB_MAKE(a, e-a, ack);
8122 p[hi] = BB_MAKE(a, BB_MAX_LEN, ack);
8130 if (sectors == 0 && hi < bb->count) {
8131 /* we might be able to combine lo and hi */
8132 /* Note: 's' is at the end of 'lo' */
8133 sector_t a = BB_OFFSET(p[hi]);
8134 int lolen = BB_LEN(p[lo]);
8135 int hilen = BB_LEN(p[hi]);
8136 int newlen = lolen + hilen - (s - a);
8137 if (s >= a && newlen < BB_MAX_LEN) {
8138 /* yes, we can combine them */
8139 int ack = BB_ACK(p[lo]) && BB_ACK(p[hi]);
8140 p[lo] = BB_MAKE(BB_OFFSET(p[lo]), newlen, ack);
8141 memmove(p + hi, p + hi + 1,
8142 (bb->count - hi - 1) * 8);
8147 /* didn't merge (it all).
8148 * Need to add a range just before 'hi' */
8149 if (bb->count >= MD_MAX_BADBLOCKS) {
8150 /* No room for more */
8154 int this_sectors = sectors;
8155 memmove(p + hi + 1, p + hi,
8156 (bb->count - hi) * 8);
8159 if (this_sectors > BB_MAX_LEN)
8160 this_sectors = BB_MAX_LEN;
8161 p[hi] = BB_MAKE(s, this_sectors, acknowledged);
8162 sectors -= this_sectors;
8169 bb->unacked_exist = 1;
8170 write_sequnlock_irqrestore(&bb->lock, flags);
8175 int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
8180 s += rdev->new_data_offset;
8182 s += rdev->data_offset;
8183 rv = md_set_badblocks(&rdev->badblocks,
8186 /* Make sure they get written out promptly */
8187 sysfs_notify_dirent_safe(rdev->sysfs_state);
8188 set_bit(MD_CHANGE_CLEAN, &rdev->mddev->flags);
8189 md_wakeup_thread(rdev->mddev->thread);
8193 EXPORT_SYMBOL_GPL(rdev_set_badblocks);
8196 * Remove a range of bad blocks from the table.
8197 * This may involve extending the table if we spilt a region,
8198 * but it must not fail. So if the table becomes full, we just
8199 * drop the remove request.
8201 static int md_clear_badblocks(struct badblocks *bb, sector_t s, int sectors)
8205 sector_t target = s + sectors;
8208 if (bb->shift > 0) {
8209 /* When clearing we round the start up and the end down.
8210 * This should not matter as the shift should align with
8211 * the block size and no rounding should ever be needed.
8212 * However it is better the think a block is bad when it
8213 * isn't than to think a block is not bad when it is.
8215 s += (1<<bb->shift) - 1;
8217 target >>= bb->shift;
8218 sectors = target - s;
8221 write_seqlock_irq(&bb->lock);
8226 /* Find the last range that starts before 'target' */
8227 while (hi - lo > 1) {
8228 int mid = (lo + hi) / 2;
8229 sector_t a = BB_OFFSET(p[mid]);
8236 /* p[lo] is the last range that could overlap the
8237 * current range. Earlier ranges could also overlap,
8238 * but only this one can overlap the end of the range.
8240 if (BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > target) {
8241 /* Partial overlap, leave the tail of this range */
8242 int ack = BB_ACK(p[lo]);
8243 sector_t a = BB_OFFSET(p[lo]);
8244 sector_t end = a + BB_LEN(p[lo]);
8247 /* we need to split this range */
8248 if (bb->count >= MD_MAX_BADBLOCKS) {
8252 memmove(p+lo+1, p+lo, (bb->count - lo) * 8);
8254 p[lo] = BB_MAKE(a, s-a, ack);
8257 p[lo] = BB_MAKE(target, end - target, ack);
8258 /* there is no longer an overlap */
8263 BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) {
8264 /* This range does overlap */
8265 if (BB_OFFSET(p[lo]) < s) {
8266 /* Keep the early parts of this range. */
8267 int ack = BB_ACK(p[lo]);
8268 sector_t start = BB_OFFSET(p[lo]);
8269 p[lo] = BB_MAKE(start, s - start, ack);
8270 /* now low doesn't overlap, so.. */
8275 /* 'lo' is strictly before, 'hi' is strictly after,
8276 * anything between needs to be discarded
8279 memmove(p+lo+1, p+hi, (bb->count - hi) * 8);
8280 bb->count -= (hi - lo - 1);
8286 write_sequnlock_irq(&bb->lock);
8290 int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
8294 s += rdev->new_data_offset;
8296 s += rdev->data_offset;
8297 return md_clear_badblocks(&rdev->badblocks,
8300 EXPORT_SYMBOL_GPL(rdev_clear_badblocks);
8303 * Acknowledge all bad blocks in a list.
8304 * This only succeeds if ->changed is clear. It is used by
8305 * in-kernel metadata updates
8307 void md_ack_all_badblocks(struct badblocks *bb)
8309 if (bb->page == NULL || bb->changed)
8310 /* no point even trying */
8312 write_seqlock_irq(&bb->lock);
8314 if (bb->changed == 0 && bb->unacked_exist) {
8317 for (i = 0; i < bb->count ; i++) {
8318 if (!BB_ACK(p[i])) {
8319 sector_t start = BB_OFFSET(p[i]);
8320 int len = BB_LEN(p[i]);
8321 p[i] = BB_MAKE(start, len, 1);
8324 bb->unacked_exist = 0;
8326 write_sequnlock_irq(&bb->lock);
8328 EXPORT_SYMBOL_GPL(md_ack_all_badblocks);
8330 /* sysfs access to bad-blocks list.
8331 * We present two files.
8332 * 'bad-blocks' lists sector numbers and lengths of ranges that
8333 * are recorded as bad. The list is truncated to fit within
8334 * the one-page limit of sysfs.
8335 * Writing "sector length" to this file adds an acknowledged
8337 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
8338 * been acknowledged. Writing to this file adds bad blocks
8339 * without acknowledging them. This is largely for testing.
8343 badblocks_show(struct badblocks *bb, char *page, int unack)
8354 seq = read_seqbegin(&bb->lock);
8359 while (len < PAGE_SIZE && i < bb->count) {
8360 sector_t s = BB_OFFSET(p[i]);
8361 unsigned int length = BB_LEN(p[i]);
8362 int ack = BB_ACK(p[i]);
8368 len += snprintf(page+len, PAGE_SIZE-len, "%llu %u\n",
8369 (unsigned long long)s << bb->shift,
8370 length << bb->shift);
8372 if (unack && len == 0)
8373 bb->unacked_exist = 0;
8375 if (read_seqretry(&bb->lock, seq))
8384 badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack)
8386 unsigned long long sector;
8390 /* Allow clearing via sysfs *only* for testing/debugging.
8391 * Normally only a successful write may clear a badblock
8394 if (page[0] == '-') {
8398 #endif /* DO_DEBUG */
8400 switch (sscanf(page, "%llu %d%c", §or, &length, &newline)) {
8402 if (newline != '\n')
8414 md_clear_badblocks(bb, sector, length);
8417 #endif /* DO_DEBUG */
8418 if (md_set_badblocks(bb, sector, length, !unack))
8424 static int md_notify_reboot(struct notifier_block *this,
8425 unsigned long code, void *x)
8427 struct list_head *tmp;
8428 struct mddev *mddev;
8431 for_each_mddev(mddev, tmp) {
8432 if (mddev_trylock(mddev)) {
8434 __md_stop_writes(mddev);
8435 if (mddev->persistent)
8436 mddev->safemode = 2;
8437 mddev_unlock(mddev);
8442 * certain more exotic SCSI devices are known to be
8443 * volatile wrt too early system reboots. While the
8444 * right place to handle this issue is the given
8445 * driver, we do want to have a safe RAID driver ...
8453 static struct notifier_block md_notifier = {
8454 .notifier_call = md_notify_reboot,
8456 .priority = INT_MAX, /* before any real devices */
8459 static void md_geninit(void)
8461 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
8463 proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops);
8466 static int __init md_init(void)
8470 md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0);
8474 md_misc_wq = alloc_workqueue("md_misc", 0, 0);
8478 if ((ret = register_blkdev(MD_MAJOR, "md")) < 0)
8481 if ((ret = register_blkdev(0, "mdp")) < 0)
8485 blk_register_region(MKDEV(MD_MAJOR, 0), 512, THIS_MODULE,
8486 md_probe, NULL, NULL);
8487 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
8488 md_probe, NULL, NULL);
8490 register_reboot_notifier(&md_notifier);
8491 raid_table_header = register_sysctl_table(raid_root_table);
8497 unregister_blkdev(MD_MAJOR, "md");
8499 destroy_workqueue(md_misc_wq);
8501 destroy_workqueue(md_wq);
8509 * Searches all registered partitions for autorun RAID arrays
8513 static LIST_HEAD(all_detected_devices);
8514 struct detected_devices_node {
8515 struct list_head list;
8519 void md_autodetect_dev(dev_t dev)
8521 struct detected_devices_node *node_detected_dev;
8523 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
8524 if (node_detected_dev) {
8525 node_detected_dev->dev = dev;
8526 list_add_tail(&node_detected_dev->list, &all_detected_devices);
8528 printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed"
8529 ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev));
8533 static void autostart_arrays(int part)
8535 struct md_rdev *rdev;
8536 struct detected_devices_node *node_detected_dev;
8538 int i_scanned, i_passed;
8543 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
8545 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
8547 node_detected_dev = list_entry(all_detected_devices.next,
8548 struct detected_devices_node, list);
8549 list_del(&node_detected_dev->list);
8550 dev = node_detected_dev->dev;
8551 kfree(node_detected_dev);
8552 rdev = md_import_device(dev,0, 90);
8556 if (test_bit(Faulty, &rdev->flags))
8559 set_bit(AutoDetected, &rdev->flags);
8560 list_add(&rdev->same_set, &pending_raid_disks);
8564 printk(KERN_INFO "md: Scanned %d and added %d devices.\n",
8565 i_scanned, i_passed);
8567 autorun_devices(part);
8570 #endif /* !MODULE */
8572 static __exit void md_exit(void)
8574 struct mddev *mddev;
8575 struct list_head *tmp;
8578 blk_unregister_region(MKDEV(MD_MAJOR,0), 512);
8579 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
8581 unregister_blkdev(MD_MAJOR,"md");
8582 unregister_blkdev(mdp_major, "mdp");
8583 unregister_reboot_notifier(&md_notifier);
8584 unregister_sysctl_table(raid_table_header);
8586 /* We cannot unload the modules while some process is
8587 * waiting for us in select() or poll() - wake them up
8590 while (waitqueue_active(&md_event_waiters)) {
8591 /* not safe to leave yet */
8592 wake_up(&md_event_waiters);
8596 remove_proc_entry("mdstat", NULL);
8598 for_each_mddev(mddev, tmp) {
8599 export_array(mddev);
8600 mddev->hold_active = 0;
8602 destroy_workqueue(md_misc_wq);
8603 destroy_workqueue(md_wq);
8606 subsys_initcall(md_init);
8607 module_exit(md_exit)
8609 static int get_ro(char *buffer, struct kernel_param *kp)
8611 return sprintf(buffer, "%d", start_readonly);
8613 static int set_ro(const char *val, struct kernel_param *kp)
8616 int num = simple_strtoul(val, &e, 10);
8617 if (*val && (*e == '\0' || *e == '\n')) {
8618 start_readonly = num;
8624 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
8625 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
8626 module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR);
8628 MODULE_LICENSE("GPL");
8629 MODULE_DESCRIPTION("MD RAID framework");
8631 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);