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 void md_print_devices(void);
71 static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
72 static struct workqueue_struct *md_wq;
73 static struct workqueue_struct *md_misc_wq;
75 static int remove_and_add_spares(struct mddev *mddev,
76 struct md_rdev *this);
78 #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
81 * Default number of read corrections we'll attempt on an rdev
82 * before ejecting it from the array. We divide the read error
83 * count by 2 for every hour elapsed between read errors.
85 #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
87 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
88 * is 1000 KB/sec, so the extra system load does not show up that much.
89 * Increase it if you want to have more _guaranteed_ speed. Note that
90 * the RAID driver will use the maximum available bandwidth if the IO
91 * subsystem is idle. There is also an 'absolute maximum' reconstruction
92 * speed limit - in case reconstruction slows down your system despite
95 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
96 * or /sys/block/mdX/md/sync_speed_{min,max}
99 static int sysctl_speed_limit_min = 1000;
100 static int sysctl_speed_limit_max = 200000;
101 static inline int speed_min(struct mddev *mddev)
103 return mddev->sync_speed_min ?
104 mddev->sync_speed_min : sysctl_speed_limit_min;
107 static inline int speed_max(struct mddev *mddev)
109 return mddev->sync_speed_max ?
110 mddev->sync_speed_max : sysctl_speed_limit_max;
113 static struct ctl_table_header *raid_table_header;
115 static ctl_table raid_table[] = {
117 .procname = "speed_limit_min",
118 .data = &sysctl_speed_limit_min,
119 .maxlen = sizeof(int),
120 .mode = S_IRUGO|S_IWUSR,
121 .proc_handler = proc_dointvec,
124 .procname = "speed_limit_max",
125 .data = &sysctl_speed_limit_max,
126 .maxlen = sizeof(int),
127 .mode = S_IRUGO|S_IWUSR,
128 .proc_handler = proc_dointvec,
133 static ctl_table raid_dir_table[] = {
137 .mode = S_IRUGO|S_IXUGO,
143 static ctl_table raid_root_table[] = {
148 .child = raid_dir_table,
153 static const struct block_device_operations md_fops;
155 static int start_readonly;
158 * like bio_clone, but with a local bio set
161 struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs,
166 if (!mddev || !mddev->bio_set)
167 return bio_alloc(gfp_mask, nr_iovecs);
169 b = bio_alloc_bioset(gfp_mask, nr_iovecs, mddev->bio_set);
174 EXPORT_SYMBOL_GPL(bio_alloc_mddev);
176 struct bio *bio_clone_mddev(struct bio *bio, gfp_t gfp_mask,
179 if (!mddev || !mddev->bio_set)
180 return bio_clone(bio, gfp_mask);
182 return bio_clone_bioset(bio, gfp_mask, mddev->bio_set);
184 EXPORT_SYMBOL_GPL(bio_clone_mddev);
186 void md_trim_bio(struct bio *bio, int offset, int size)
188 /* 'bio' is a cloned bio which we need to trim to match
189 * the given offset and size.
190 * This requires adjusting bi_sector, bi_size, and bi_io_vec
193 struct bio_vec *bvec;
197 if (offset == 0 && size == bio->bi_size)
200 clear_bit(BIO_SEG_VALID, &bio->bi_flags);
202 bio_advance(bio, offset << 9);
206 /* avoid any complications with bi_idx being non-zero*/
208 memmove(bio->bi_io_vec, bio->bi_io_vec+bio->bi_idx,
209 (bio->bi_vcnt - bio->bi_idx) * sizeof(struct bio_vec));
210 bio->bi_vcnt -= bio->bi_idx;
213 /* Make sure vcnt and last bv are not too big */
214 bio_for_each_segment(bvec, bio, i) {
215 if (sofar + bvec->bv_len > size)
216 bvec->bv_len = size - sofar;
217 if (bvec->bv_len == 0) {
221 sofar += bvec->bv_len;
224 EXPORT_SYMBOL_GPL(md_trim_bio);
227 * We have a system wide 'event count' that is incremented
228 * on any 'interesting' event, and readers of /proc/mdstat
229 * can use 'poll' or 'select' to find out when the event
233 * start array, stop array, error, add device, remove device,
234 * start build, activate spare
236 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
237 static atomic_t md_event_count;
238 void md_new_event(struct mddev *mddev)
240 atomic_inc(&md_event_count);
241 wake_up(&md_event_waiters);
243 EXPORT_SYMBOL_GPL(md_new_event);
245 /* Alternate version that can be called from interrupts
246 * when calling sysfs_notify isn't needed.
248 static void md_new_event_inintr(struct mddev *mddev)
250 atomic_inc(&md_event_count);
251 wake_up(&md_event_waiters);
255 * Enables to iterate over all existing md arrays
256 * all_mddevs_lock protects this list.
258 static LIST_HEAD(all_mddevs);
259 static DEFINE_SPINLOCK(all_mddevs_lock);
263 * iterates through all used mddevs in the system.
264 * We take care to grab the all_mddevs_lock whenever navigating
265 * the list, and to always hold a refcount when unlocked.
266 * Any code which breaks out of this loop while own
267 * a reference to the current mddev and must mddev_put it.
269 #define for_each_mddev(_mddev,_tmp) \
271 for (({ spin_lock(&all_mddevs_lock); \
272 _tmp = all_mddevs.next; \
274 ({ if (_tmp != &all_mddevs) \
275 mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\
276 spin_unlock(&all_mddevs_lock); \
277 if (_mddev) mddev_put(_mddev); \
278 _mddev = list_entry(_tmp, struct mddev, all_mddevs); \
279 _tmp != &all_mddevs;}); \
280 ({ spin_lock(&all_mddevs_lock); \
281 _tmp = _tmp->next;}) \
285 /* Rather than calling directly into the personality make_request function,
286 * IO requests come here first so that we can check if the device is
287 * being suspended pending a reconfiguration.
288 * We hold a refcount over the call to ->make_request. By the time that
289 * call has finished, the bio has been linked into some internal structure
290 * and so is visible to ->quiesce(), so we don't need the refcount any more.
292 static void md_make_request(struct request_queue *q, struct bio *bio)
294 const int rw = bio_data_dir(bio);
295 struct mddev *mddev = q->queuedata;
297 unsigned int sectors;
299 if (mddev == NULL || mddev->pers == NULL
304 if (mddev->ro == 1 && unlikely(rw == WRITE)) {
305 bio_endio(bio, bio_sectors(bio) == 0 ? 0 : -EROFS);
308 smp_rmb(); /* Ensure implications of 'active' are visible */
310 if (mddev->suspended) {
313 prepare_to_wait(&mddev->sb_wait, &__wait,
314 TASK_UNINTERRUPTIBLE);
315 if (!mddev->suspended)
321 finish_wait(&mddev->sb_wait, &__wait);
323 atomic_inc(&mddev->active_io);
327 * save the sectors now since our bio can
328 * go away inside make_request
330 sectors = bio_sectors(bio);
331 mddev->pers->make_request(mddev, bio);
333 cpu = part_stat_lock();
334 part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]);
335 part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw], sectors);
338 if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended)
339 wake_up(&mddev->sb_wait);
342 /* mddev_suspend makes sure no new requests are submitted
343 * to the device, and that any requests that have been submitted
344 * are completely handled.
345 * Once ->stop is called and completes, the module will be completely
348 void mddev_suspend(struct mddev *mddev)
350 BUG_ON(mddev->suspended);
351 mddev->suspended = 1;
353 wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0);
354 mddev->pers->quiesce(mddev, 1);
356 del_timer_sync(&mddev->safemode_timer);
358 EXPORT_SYMBOL_GPL(mddev_suspend);
360 void mddev_resume(struct mddev *mddev)
362 mddev->suspended = 0;
363 wake_up(&mddev->sb_wait);
364 mddev->pers->quiesce(mddev, 0);
366 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
367 md_wakeup_thread(mddev->thread);
368 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
370 EXPORT_SYMBOL_GPL(mddev_resume);
372 int mddev_congested(struct mddev *mddev, int bits)
374 return mddev->suspended;
376 EXPORT_SYMBOL(mddev_congested);
379 * Generic flush handling for md
382 static void md_end_flush(struct bio *bio, int err)
384 struct md_rdev *rdev = bio->bi_private;
385 struct mddev *mddev = rdev->mddev;
387 rdev_dec_pending(rdev, mddev);
389 if (atomic_dec_and_test(&mddev->flush_pending)) {
390 /* The pre-request flush has finished */
391 queue_work(md_wq, &mddev->flush_work);
396 static void md_submit_flush_data(struct work_struct *ws);
398 static void submit_flushes(struct work_struct *ws)
400 struct mddev *mddev = container_of(ws, struct mddev, flush_work);
401 struct md_rdev *rdev;
403 INIT_WORK(&mddev->flush_work, md_submit_flush_data);
404 atomic_set(&mddev->flush_pending, 1);
406 rdev_for_each_rcu(rdev, mddev)
407 if (rdev->raid_disk >= 0 &&
408 !test_bit(Faulty, &rdev->flags)) {
409 /* Take two references, one is dropped
410 * when request finishes, one after
411 * we reclaim rcu_read_lock
414 atomic_inc(&rdev->nr_pending);
415 atomic_inc(&rdev->nr_pending);
417 bi = bio_alloc_mddev(GFP_NOIO, 0, mddev);
418 bi->bi_end_io = md_end_flush;
419 bi->bi_private = rdev;
420 bi->bi_bdev = rdev->bdev;
421 atomic_inc(&mddev->flush_pending);
422 submit_bio(WRITE_FLUSH, bi);
424 rdev_dec_pending(rdev, mddev);
427 if (atomic_dec_and_test(&mddev->flush_pending))
428 queue_work(md_wq, &mddev->flush_work);
431 static void md_submit_flush_data(struct work_struct *ws)
433 struct mddev *mddev = container_of(ws, struct mddev, flush_work);
434 struct bio *bio = mddev->flush_bio;
436 if (bio->bi_size == 0)
437 /* an empty barrier - all done */
440 bio->bi_rw &= ~REQ_FLUSH;
441 mddev->pers->make_request(mddev, bio);
444 mddev->flush_bio = NULL;
445 wake_up(&mddev->sb_wait);
448 void md_flush_request(struct mddev *mddev, struct bio *bio)
450 spin_lock_irq(&mddev->write_lock);
451 wait_event_lock_irq(mddev->sb_wait,
454 mddev->flush_bio = bio;
455 spin_unlock_irq(&mddev->write_lock);
457 INIT_WORK(&mddev->flush_work, submit_flushes);
458 queue_work(md_wq, &mddev->flush_work);
460 EXPORT_SYMBOL(md_flush_request);
462 void md_unplug(struct blk_plug_cb *cb, bool from_schedule)
464 struct mddev *mddev = cb->data;
465 md_wakeup_thread(mddev->thread);
468 EXPORT_SYMBOL(md_unplug);
470 static inline struct mddev *mddev_get(struct mddev *mddev)
472 atomic_inc(&mddev->active);
476 static void mddev_delayed_delete(struct work_struct *ws);
478 static void mddev_put(struct mddev *mddev)
480 struct bio_set *bs = NULL;
482 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
484 if (!mddev->raid_disks && list_empty(&mddev->disks) &&
485 mddev->ctime == 0 && !mddev->hold_active) {
486 /* Array is not configured at all, and not held active,
488 list_del_init(&mddev->all_mddevs);
490 mddev->bio_set = NULL;
491 if (mddev->gendisk) {
492 /* We did a probe so need to clean up. Call
493 * queue_work inside the spinlock so that
494 * flush_workqueue() after mddev_find will
495 * succeed in waiting for the work to be done.
497 INIT_WORK(&mddev->del_work, mddev_delayed_delete);
498 queue_work(md_misc_wq, &mddev->del_work);
502 spin_unlock(&all_mddevs_lock);
507 void mddev_init(struct mddev *mddev)
509 mutex_init(&mddev->open_mutex);
510 mutex_init(&mddev->reconfig_mutex);
511 mutex_init(&mddev->bitmap_info.mutex);
512 INIT_LIST_HEAD(&mddev->disks);
513 INIT_LIST_HEAD(&mddev->all_mddevs);
514 init_timer(&mddev->safemode_timer);
515 atomic_set(&mddev->active, 1);
516 atomic_set(&mddev->openers, 0);
517 atomic_set(&mddev->active_io, 0);
518 spin_lock_init(&mddev->write_lock);
519 atomic_set(&mddev->flush_pending, 0);
520 init_waitqueue_head(&mddev->sb_wait);
521 init_waitqueue_head(&mddev->recovery_wait);
522 mddev->reshape_position = MaxSector;
523 mddev->reshape_backwards = 0;
524 mddev->last_sync_action = "none";
525 mddev->resync_min = 0;
526 mddev->resync_max = MaxSector;
527 mddev->level = LEVEL_NONE;
529 EXPORT_SYMBOL_GPL(mddev_init);
531 static struct mddev * mddev_find(dev_t unit)
533 struct mddev *mddev, *new = NULL;
535 if (unit && MAJOR(unit) != MD_MAJOR)
536 unit &= ~((1<<MdpMinorShift)-1);
539 spin_lock(&all_mddevs_lock);
542 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
543 if (mddev->unit == unit) {
545 spin_unlock(&all_mddevs_lock);
551 list_add(&new->all_mddevs, &all_mddevs);
552 spin_unlock(&all_mddevs_lock);
553 new->hold_active = UNTIL_IOCTL;
557 /* find an unused unit number */
558 static int next_minor = 512;
559 int start = next_minor;
563 dev = MKDEV(MD_MAJOR, next_minor);
565 if (next_minor > MINORMASK)
567 if (next_minor == start) {
568 /* Oh dear, all in use. */
569 spin_unlock(&all_mddevs_lock);
575 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
576 if (mddev->unit == dev) {
582 new->md_minor = MINOR(dev);
583 new->hold_active = UNTIL_STOP;
584 list_add(&new->all_mddevs, &all_mddevs);
585 spin_unlock(&all_mddevs_lock);
588 spin_unlock(&all_mddevs_lock);
590 new = kzalloc(sizeof(*new), GFP_KERNEL);
595 if (MAJOR(unit) == MD_MAJOR)
596 new->md_minor = MINOR(unit);
598 new->md_minor = MINOR(unit) >> MdpMinorShift;
605 static inline int __must_check mddev_lock(struct mddev * mddev)
607 return mutex_lock_interruptible(&mddev->reconfig_mutex);
610 /* Sometimes we need to take the lock in a situation where
611 * failure due to interrupts is not acceptable.
613 static inline void mddev_lock_nointr(struct mddev * mddev)
615 mutex_lock(&mddev->reconfig_mutex);
618 static inline int mddev_is_locked(struct mddev *mddev)
620 return mutex_is_locked(&mddev->reconfig_mutex);
623 static inline int mddev_trylock(struct mddev * mddev)
625 return mutex_trylock(&mddev->reconfig_mutex);
628 static struct attribute_group md_redundancy_group;
630 static void mddev_unlock(struct mddev * mddev)
632 if (mddev->to_remove) {
633 /* These cannot be removed under reconfig_mutex as
634 * an access to the files will try to take reconfig_mutex
635 * while holding the file unremovable, which leads to
637 * So hold set sysfs_active while the remove in happeing,
638 * and anything else which might set ->to_remove or my
639 * otherwise change the sysfs namespace will fail with
640 * -EBUSY if sysfs_active is still set.
641 * We set sysfs_active under reconfig_mutex and elsewhere
642 * test it under the same mutex to ensure its correct value
645 struct attribute_group *to_remove = mddev->to_remove;
646 mddev->to_remove = NULL;
647 mddev->sysfs_active = 1;
648 mutex_unlock(&mddev->reconfig_mutex);
650 if (mddev->kobj.sd) {
651 if (to_remove != &md_redundancy_group)
652 sysfs_remove_group(&mddev->kobj, to_remove);
653 if (mddev->pers == NULL ||
654 mddev->pers->sync_request == NULL) {
655 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
656 if (mddev->sysfs_action)
657 sysfs_put(mddev->sysfs_action);
658 mddev->sysfs_action = NULL;
661 mddev->sysfs_active = 0;
663 mutex_unlock(&mddev->reconfig_mutex);
665 /* As we've dropped the mutex we need a spinlock to
666 * make sure the thread doesn't disappear
668 spin_lock(&pers_lock);
669 md_wakeup_thread(mddev->thread);
670 spin_unlock(&pers_lock);
673 static struct md_rdev * find_rdev_nr(struct mddev *mddev, int nr)
675 struct md_rdev *rdev;
677 rdev_for_each(rdev, mddev)
678 if (rdev->desc_nr == nr)
684 static struct md_rdev *find_rdev_nr_rcu(struct mddev *mddev, int nr)
686 struct md_rdev *rdev;
688 rdev_for_each_rcu(rdev, mddev)
689 if (rdev->desc_nr == nr)
695 static struct md_rdev *find_rdev(struct mddev *mddev, dev_t dev)
697 struct md_rdev *rdev;
699 rdev_for_each(rdev, mddev)
700 if (rdev->bdev->bd_dev == dev)
706 static struct md_rdev *find_rdev_rcu(struct mddev *mddev, dev_t dev)
708 struct md_rdev *rdev;
710 rdev_for_each_rcu(rdev, mddev)
711 if (rdev->bdev->bd_dev == dev)
717 static struct md_personality *find_pers(int level, char *clevel)
719 struct md_personality *pers;
720 list_for_each_entry(pers, &pers_list, list) {
721 if (level != LEVEL_NONE && pers->level == level)
723 if (strcmp(pers->name, clevel)==0)
729 /* return the offset of the super block in 512byte sectors */
730 static inline sector_t calc_dev_sboffset(struct md_rdev *rdev)
732 sector_t num_sectors = i_size_read(rdev->bdev->bd_inode) / 512;
733 return MD_NEW_SIZE_SECTORS(num_sectors);
736 static int alloc_disk_sb(struct md_rdev * rdev)
741 rdev->sb_page = alloc_page(GFP_KERNEL);
742 if (!rdev->sb_page) {
743 printk(KERN_ALERT "md: out of memory.\n");
750 void md_rdev_clear(struct md_rdev *rdev)
753 put_page(rdev->sb_page);
755 rdev->sb_page = NULL;
760 put_page(rdev->bb_page);
761 rdev->bb_page = NULL;
763 kfree(rdev->badblocks.page);
764 rdev->badblocks.page = NULL;
766 EXPORT_SYMBOL_GPL(md_rdev_clear);
768 static void super_written(struct bio *bio, int error)
770 struct md_rdev *rdev = bio->bi_private;
771 struct mddev *mddev = rdev->mddev;
773 if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) {
774 printk("md: super_written gets error=%d, uptodate=%d\n",
775 error, test_bit(BIO_UPTODATE, &bio->bi_flags));
776 WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags));
777 md_error(mddev, rdev);
780 if (atomic_dec_and_test(&mddev->pending_writes))
781 wake_up(&mddev->sb_wait);
785 void md_super_write(struct mddev *mddev, struct md_rdev *rdev,
786 sector_t sector, int size, struct page *page)
788 /* write first size bytes of page to sector of rdev
789 * Increment mddev->pending_writes before returning
790 * and decrement it on completion, waking up sb_wait
791 * if zero is reached.
792 * If an error occurred, call md_error
794 struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, mddev);
796 bio->bi_bdev = rdev->meta_bdev ? rdev->meta_bdev : rdev->bdev;
797 bio->bi_sector = sector;
798 bio_add_page(bio, page, size, 0);
799 bio->bi_private = rdev;
800 bio->bi_end_io = super_written;
802 atomic_inc(&mddev->pending_writes);
803 submit_bio(WRITE_FLUSH_FUA, bio);
806 void md_super_wait(struct mddev *mddev)
808 /* wait for all superblock writes that were scheduled to complete */
811 prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE);
812 if (atomic_read(&mddev->pending_writes)==0)
816 finish_wait(&mddev->sb_wait, &wq);
819 static void bi_complete(struct bio *bio, int error)
821 complete((struct completion*)bio->bi_private);
824 int sync_page_io(struct md_rdev *rdev, sector_t sector, int size,
825 struct page *page, int rw, bool metadata_op)
827 struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, rdev->mddev);
828 struct completion event;
833 bio->bi_bdev = (metadata_op && rdev->meta_bdev) ?
834 rdev->meta_bdev : rdev->bdev;
836 bio->bi_sector = sector + rdev->sb_start;
837 else if (rdev->mddev->reshape_position != MaxSector &&
838 (rdev->mddev->reshape_backwards ==
839 (sector >= rdev->mddev->reshape_position)))
840 bio->bi_sector = sector + rdev->new_data_offset;
842 bio->bi_sector = sector + rdev->data_offset;
843 bio_add_page(bio, page, size, 0);
844 init_completion(&event);
845 bio->bi_private = &event;
846 bio->bi_end_io = bi_complete;
848 wait_for_completion(&event);
850 ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
854 EXPORT_SYMBOL_GPL(sync_page_io);
856 static int read_disk_sb(struct md_rdev * rdev, int size)
858 char b[BDEVNAME_SIZE];
859 if (!rdev->sb_page) {
867 if (!sync_page_io(rdev, 0, size, rdev->sb_page, READ, true))
873 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
874 bdevname(rdev->bdev,b));
878 static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
880 return sb1->set_uuid0 == sb2->set_uuid0 &&
881 sb1->set_uuid1 == sb2->set_uuid1 &&
882 sb1->set_uuid2 == sb2->set_uuid2 &&
883 sb1->set_uuid3 == sb2->set_uuid3;
886 static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
889 mdp_super_t *tmp1, *tmp2;
891 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
892 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
894 if (!tmp1 || !tmp2) {
896 printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n");
904 * nr_disks is not constant
909 ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0);
917 static u32 md_csum_fold(u32 csum)
919 csum = (csum & 0xffff) + (csum >> 16);
920 return (csum & 0xffff) + (csum >> 16);
923 static unsigned int calc_sb_csum(mdp_super_t * sb)
926 u32 *sb32 = (u32*)sb;
928 unsigned int disk_csum, csum;
930 disk_csum = sb->sb_csum;
933 for (i = 0; i < MD_SB_BYTES/4 ; i++)
935 csum = (newcsum & 0xffffffff) + (newcsum>>32);
939 /* This used to use csum_partial, which was wrong for several
940 * reasons including that different results are returned on
941 * different architectures. It isn't critical that we get exactly
942 * the same return value as before (we always csum_fold before
943 * testing, and that removes any differences). However as we
944 * know that csum_partial always returned a 16bit value on
945 * alphas, do a fold to maximise conformity to previous behaviour.
947 sb->sb_csum = md_csum_fold(disk_csum);
949 sb->sb_csum = disk_csum;
956 * Handle superblock details.
957 * We want to be able to handle multiple superblock formats
958 * so we have a common interface to them all, and an array of
959 * different handlers.
960 * We rely on user-space to write the initial superblock, and support
961 * reading and updating of superblocks.
962 * Interface methods are:
963 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version)
964 * loads and validates a superblock on dev.
965 * if refdev != NULL, compare superblocks on both devices
967 * 0 - dev has a superblock that is compatible with refdev
968 * 1 - dev has a superblock that is compatible and newer than refdev
969 * so dev should be used as the refdev in future
970 * -EINVAL superblock incompatible or invalid
971 * -othererror e.g. -EIO
973 * int validate_super(struct mddev *mddev, struct md_rdev *dev)
974 * Verify that dev is acceptable into mddev.
975 * The first time, mddev->raid_disks will be 0, and data from
976 * dev should be merged in. Subsequent calls check that dev
977 * is new enough. Return 0 or -EINVAL
979 * void sync_super(struct mddev *mddev, struct md_rdev *dev)
980 * Update the superblock for rdev with data in mddev
981 * This does not write to disc.
987 struct module *owner;
988 int (*load_super)(struct md_rdev *rdev,
989 struct md_rdev *refdev,
991 int (*validate_super)(struct mddev *mddev,
992 struct md_rdev *rdev);
993 void (*sync_super)(struct mddev *mddev,
994 struct md_rdev *rdev);
995 unsigned long long (*rdev_size_change)(struct md_rdev *rdev,
996 sector_t num_sectors);
997 int (*allow_new_offset)(struct md_rdev *rdev,
998 unsigned long long new_offset);
1002 * Check that the given mddev has no bitmap.
1004 * This function is called from the run method of all personalities that do not
1005 * support bitmaps. It prints an error message and returns non-zero if mddev
1006 * has a bitmap. Otherwise, it returns 0.
1009 int md_check_no_bitmap(struct mddev *mddev)
1011 if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset)
1013 printk(KERN_ERR "%s: bitmaps are not supported for %s\n",
1014 mdname(mddev), mddev->pers->name);
1017 EXPORT_SYMBOL(md_check_no_bitmap);
1020 * load_super for 0.90.0
1022 static int super_90_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
1024 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1029 * Calculate the position of the superblock (512byte sectors),
1030 * it's at the end of the disk.
1032 * It also happens to be a multiple of 4Kb.
1034 rdev->sb_start = calc_dev_sboffset(rdev);
1036 ret = read_disk_sb(rdev, MD_SB_BYTES);
1037 if (ret) return ret;
1041 bdevname(rdev->bdev, b);
1042 sb = page_address(rdev->sb_page);
1044 if (sb->md_magic != MD_SB_MAGIC) {
1045 printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
1050 if (sb->major_version != 0 ||
1051 sb->minor_version < 90 ||
1052 sb->minor_version > 91) {
1053 printk(KERN_WARNING "Bad version number %d.%d on %s\n",
1054 sb->major_version, sb->minor_version,
1059 if (sb->raid_disks <= 0)
1062 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
1063 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
1068 rdev->preferred_minor = sb->md_minor;
1069 rdev->data_offset = 0;
1070 rdev->new_data_offset = 0;
1071 rdev->sb_size = MD_SB_BYTES;
1072 rdev->badblocks.shift = -1;
1074 if (sb->level == LEVEL_MULTIPATH)
1077 rdev->desc_nr = sb->this_disk.number;
1083 mdp_super_t *refsb = page_address(refdev->sb_page);
1084 if (!uuid_equal(refsb, sb)) {
1085 printk(KERN_WARNING "md: %s has different UUID to %s\n",
1086 b, bdevname(refdev->bdev,b2));
1089 if (!sb_equal(refsb, sb)) {
1090 printk(KERN_WARNING "md: %s has same UUID"
1091 " but different superblock to %s\n",
1092 b, bdevname(refdev->bdev, b2));
1096 ev2 = md_event(refsb);
1102 rdev->sectors = rdev->sb_start;
1103 /* Limit to 4TB as metadata cannot record more than that.
1104 * (not needed for Linear and RAID0 as metadata doesn't
1107 if (rdev->sectors >= (2ULL << 32) && sb->level >= 1)
1108 rdev->sectors = (2ULL << 32) - 2;
1110 if (rdev->sectors < ((sector_t)sb->size) * 2 && sb->level >= 1)
1111 /* "this cannot possibly happen" ... */
1119 * validate_super for 0.90.0
1121 static int super_90_validate(struct mddev *mddev, struct md_rdev *rdev)
1124 mdp_super_t *sb = page_address(rdev->sb_page);
1125 __u64 ev1 = md_event(sb);
1127 rdev->raid_disk = -1;
1128 clear_bit(Faulty, &rdev->flags);
1129 clear_bit(In_sync, &rdev->flags);
1130 clear_bit(WriteMostly, &rdev->flags);
1132 if (mddev->raid_disks == 0) {
1133 mddev->major_version = 0;
1134 mddev->minor_version = sb->minor_version;
1135 mddev->patch_version = sb->patch_version;
1136 mddev->external = 0;
1137 mddev->chunk_sectors = sb->chunk_size >> 9;
1138 mddev->ctime = sb->ctime;
1139 mddev->utime = sb->utime;
1140 mddev->level = sb->level;
1141 mddev->clevel[0] = 0;
1142 mddev->layout = sb->layout;
1143 mddev->raid_disks = sb->raid_disks;
1144 mddev->dev_sectors = ((sector_t)sb->size) * 2;
1145 mddev->events = ev1;
1146 mddev->bitmap_info.offset = 0;
1147 mddev->bitmap_info.space = 0;
1148 /* bitmap can use 60 K after the 4K superblocks */
1149 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
1150 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
1151 mddev->reshape_backwards = 0;
1153 if (mddev->minor_version >= 91) {
1154 mddev->reshape_position = sb->reshape_position;
1155 mddev->delta_disks = sb->delta_disks;
1156 mddev->new_level = sb->new_level;
1157 mddev->new_layout = sb->new_layout;
1158 mddev->new_chunk_sectors = sb->new_chunk >> 9;
1159 if (mddev->delta_disks < 0)
1160 mddev->reshape_backwards = 1;
1162 mddev->reshape_position = MaxSector;
1163 mddev->delta_disks = 0;
1164 mddev->new_level = mddev->level;
1165 mddev->new_layout = mddev->layout;
1166 mddev->new_chunk_sectors = mddev->chunk_sectors;
1169 if (sb->state & (1<<MD_SB_CLEAN))
1170 mddev->recovery_cp = MaxSector;
1172 if (sb->events_hi == sb->cp_events_hi &&
1173 sb->events_lo == sb->cp_events_lo) {
1174 mddev->recovery_cp = sb->recovery_cp;
1176 mddev->recovery_cp = 0;
1179 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
1180 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
1181 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
1182 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
1184 mddev->max_disks = MD_SB_DISKS;
1186 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
1187 mddev->bitmap_info.file == NULL) {
1188 mddev->bitmap_info.offset =
1189 mddev->bitmap_info.default_offset;
1190 mddev->bitmap_info.space =
1191 mddev->bitmap_info.default_space;
1194 } else if (mddev->pers == NULL) {
1195 /* Insist on good event counter while assembling, except
1196 * for spares (which don't need an event count) */
1198 if (sb->disks[rdev->desc_nr].state & (
1199 (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE)))
1200 if (ev1 < mddev->events)
1202 } else if (mddev->bitmap) {
1203 /* if adding to array with a bitmap, then we can accept an
1204 * older device ... but not too old.
1206 if (ev1 < mddev->bitmap->events_cleared)
1209 if (ev1 < mddev->events)
1210 /* just a hot-add of a new device, leave raid_disk at -1 */
1214 if (mddev->level != LEVEL_MULTIPATH) {
1215 desc = sb->disks + rdev->desc_nr;
1217 if (desc->state & (1<<MD_DISK_FAULTY))
1218 set_bit(Faulty, &rdev->flags);
1219 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
1220 desc->raid_disk < mddev->raid_disks */) {
1221 set_bit(In_sync, &rdev->flags);
1222 rdev->raid_disk = desc->raid_disk;
1223 } else if (desc->state & (1<<MD_DISK_ACTIVE)) {
1224 /* active but not in sync implies recovery up to
1225 * reshape position. We don't know exactly where
1226 * that is, so set to zero for now */
1227 if (mddev->minor_version >= 91) {
1228 rdev->recovery_offset = 0;
1229 rdev->raid_disk = desc->raid_disk;
1232 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
1233 set_bit(WriteMostly, &rdev->flags);
1234 } else /* MULTIPATH are always insync */
1235 set_bit(In_sync, &rdev->flags);
1240 * sync_super for 0.90.0
1242 static void super_90_sync(struct mddev *mddev, struct md_rdev *rdev)
1245 struct md_rdev *rdev2;
1246 int next_spare = mddev->raid_disks;
1249 /* make rdev->sb match mddev data..
1252 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1253 * 3/ any empty disks < next_spare become removed
1255 * disks[0] gets initialised to REMOVED because
1256 * we cannot be sure from other fields if it has
1257 * been initialised or not.
1260 int active=0, working=0,failed=0,spare=0,nr_disks=0;
1262 rdev->sb_size = MD_SB_BYTES;
1264 sb = page_address(rdev->sb_page);
1266 memset(sb, 0, sizeof(*sb));
1268 sb->md_magic = MD_SB_MAGIC;
1269 sb->major_version = mddev->major_version;
1270 sb->patch_version = mddev->patch_version;
1271 sb->gvalid_words = 0; /* ignored */
1272 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
1273 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
1274 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
1275 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
1277 sb->ctime = mddev->ctime;
1278 sb->level = mddev->level;
1279 sb->size = mddev->dev_sectors / 2;
1280 sb->raid_disks = mddev->raid_disks;
1281 sb->md_minor = mddev->md_minor;
1282 sb->not_persistent = 0;
1283 sb->utime = mddev->utime;
1285 sb->events_hi = (mddev->events>>32);
1286 sb->events_lo = (u32)mddev->events;
1288 if (mddev->reshape_position == MaxSector)
1289 sb->minor_version = 90;
1291 sb->minor_version = 91;
1292 sb->reshape_position = mddev->reshape_position;
1293 sb->new_level = mddev->new_level;
1294 sb->delta_disks = mddev->delta_disks;
1295 sb->new_layout = mddev->new_layout;
1296 sb->new_chunk = mddev->new_chunk_sectors << 9;
1298 mddev->minor_version = sb->minor_version;
1301 sb->recovery_cp = mddev->recovery_cp;
1302 sb->cp_events_hi = (mddev->events>>32);
1303 sb->cp_events_lo = (u32)mddev->events;
1304 if (mddev->recovery_cp == MaxSector)
1305 sb->state = (1<< MD_SB_CLEAN);
1307 sb->recovery_cp = 0;
1309 sb->layout = mddev->layout;
1310 sb->chunk_size = mddev->chunk_sectors << 9;
1312 if (mddev->bitmap && mddev->bitmap_info.file == NULL)
1313 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
1315 sb->disks[0].state = (1<<MD_DISK_REMOVED);
1316 rdev_for_each(rdev2, mddev) {
1319 int is_active = test_bit(In_sync, &rdev2->flags);
1321 if (rdev2->raid_disk >= 0 &&
1322 sb->minor_version >= 91)
1323 /* we have nowhere to store the recovery_offset,
1324 * but if it is not below the reshape_position,
1325 * we can piggy-back on that.
1328 if (rdev2->raid_disk < 0 ||
1329 test_bit(Faulty, &rdev2->flags))
1332 desc_nr = rdev2->raid_disk;
1334 desc_nr = next_spare++;
1335 rdev2->desc_nr = desc_nr;
1336 d = &sb->disks[rdev2->desc_nr];
1338 d->number = rdev2->desc_nr;
1339 d->major = MAJOR(rdev2->bdev->bd_dev);
1340 d->minor = MINOR(rdev2->bdev->bd_dev);
1342 d->raid_disk = rdev2->raid_disk;
1344 d->raid_disk = rdev2->desc_nr; /* compatibility */
1345 if (test_bit(Faulty, &rdev2->flags))
1346 d->state = (1<<MD_DISK_FAULTY);
1347 else if (is_active) {
1348 d->state = (1<<MD_DISK_ACTIVE);
1349 if (test_bit(In_sync, &rdev2->flags))
1350 d->state |= (1<<MD_DISK_SYNC);
1358 if (test_bit(WriteMostly, &rdev2->flags))
1359 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1361 /* now set the "removed" and "faulty" bits on any missing devices */
1362 for (i=0 ; i < mddev->raid_disks ; i++) {
1363 mdp_disk_t *d = &sb->disks[i];
1364 if (d->state == 0 && d->number == 0) {
1367 d->state = (1<<MD_DISK_REMOVED);
1368 d->state |= (1<<MD_DISK_FAULTY);
1372 sb->nr_disks = nr_disks;
1373 sb->active_disks = active;
1374 sb->working_disks = working;
1375 sb->failed_disks = failed;
1376 sb->spare_disks = spare;
1378 sb->this_disk = sb->disks[rdev->desc_nr];
1379 sb->sb_csum = calc_sb_csum(sb);
1383 * rdev_size_change for 0.90.0
1385 static unsigned long long
1386 super_90_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
1388 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1389 return 0; /* component must fit device */
1390 if (rdev->mddev->bitmap_info.offset)
1391 return 0; /* can't move bitmap */
1392 rdev->sb_start = calc_dev_sboffset(rdev);
1393 if (!num_sectors || num_sectors > rdev->sb_start)
1394 num_sectors = rdev->sb_start;
1395 /* Limit to 4TB as metadata cannot record more than that.
1396 * 4TB == 2^32 KB, or 2*2^32 sectors.
1398 if (num_sectors >= (2ULL << 32) && rdev->mddev->level >= 1)
1399 num_sectors = (2ULL << 32) - 2;
1400 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1402 md_super_wait(rdev->mddev);
1407 super_90_allow_new_offset(struct md_rdev *rdev, unsigned long long new_offset)
1409 /* non-zero offset changes not possible with v0.90 */
1410 return new_offset == 0;
1414 * version 1 superblock
1417 static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb)
1421 unsigned long long newcsum;
1422 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1423 __le32 *isuper = (__le32*)sb;
1425 disk_csum = sb->sb_csum;
1428 for (; size >= 4; size -= 4)
1429 newcsum += le32_to_cpu(*isuper++);
1432 newcsum += le16_to_cpu(*(__le16*) isuper);
1434 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1435 sb->sb_csum = disk_csum;
1436 return cpu_to_le32(csum);
1439 static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors,
1441 static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
1443 struct mdp_superblock_1 *sb;
1447 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1451 * Calculate the position of the superblock in 512byte sectors.
1452 * It is always aligned to a 4K boundary and
1453 * depeding on minor_version, it can be:
1454 * 0: At least 8K, but less than 12K, from end of device
1455 * 1: At start of device
1456 * 2: 4K from start of device.
1458 switch(minor_version) {
1460 sb_start = i_size_read(rdev->bdev->bd_inode) >> 9;
1462 sb_start &= ~(sector_t)(4*2-1);
1473 rdev->sb_start = sb_start;
1475 /* superblock is rarely larger than 1K, but it can be larger,
1476 * and it is safe to read 4k, so we do that
1478 ret = read_disk_sb(rdev, 4096);
1479 if (ret) return ret;
1482 sb = page_address(rdev->sb_page);
1484 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1485 sb->major_version != cpu_to_le32(1) ||
1486 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1487 le64_to_cpu(sb->super_offset) != rdev->sb_start ||
1488 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1491 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1492 printk("md: invalid superblock checksum on %s\n",
1493 bdevname(rdev->bdev,b));
1496 if (le64_to_cpu(sb->data_size) < 10) {
1497 printk("md: data_size too small on %s\n",
1498 bdevname(rdev->bdev,b));
1503 memcmp(sb->pad3, sb->pad3+1, sizeof(sb->pad3) - sizeof(sb->pad3[1])))
1504 /* Some padding is non-zero, might be a new feature */
1507 rdev->preferred_minor = 0xffff;
1508 rdev->data_offset = le64_to_cpu(sb->data_offset);
1509 rdev->new_data_offset = rdev->data_offset;
1510 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE) &&
1511 (le32_to_cpu(sb->feature_map) & MD_FEATURE_NEW_OFFSET))
1512 rdev->new_data_offset += (s32)le32_to_cpu(sb->new_offset);
1513 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1515 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1516 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1517 if (rdev->sb_size & bmask)
1518 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1521 && rdev->data_offset < sb_start + (rdev->sb_size/512))
1524 && rdev->new_data_offset < sb_start + (rdev->sb_size/512))
1527 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1530 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1532 if (!rdev->bb_page) {
1533 rdev->bb_page = alloc_page(GFP_KERNEL);
1537 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BAD_BLOCKS) &&
1538 rdev->badblocks.count == 0) {
1539 /* need to load the bad block list.
1540 * Currently we limit it to one page.
1546 int sectors = le16_to_cpu(sb->bblog_size);
1547 if (sectors > (PAGE_SIZE / 512))
1549 offset = le32_to_cpu(sb->bblog_offset);
1552 bb_sector = (long long)offset;
1553 if (!sync_page_io(rdev, bb_sector, sectors << 9,
1554 rdev->bb_page, READ, true))
1556 bbp = (u64 *)page_address(rdev->bb_page);
1557 rdev->badblocks.shift = sb->bblog_shift;
1558 for (i = 0 ; i < (sectors << (9-3)) ; i++, bbp++) {
1559 u64 bb = le64_to_cpu(*bbp);
1560 int count = bb & (0x3ff);
1561 u64 sector = bb >> 10;
1562 sector <<= sb->bblog_shift;
1563 count <<= sb->bblog_shift;
1566 if (md_set_badblocks(&rdev->badblocks,
1567 sector, count, 1) == 0)
1570 } else if (sb->bblog_offset != 0)
1571 rdev->badblocks.shift = 0;
1577 struct mdp_superblock_1 *refsb = page_address(refdev->sb_page);
1579 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1580 sb->level != refsb->level ||
1581 sb->layout != refsb->layout ||
1582 sb->chunksize != refsb->chunksize) {
1583 printk(KERN_WARNING "md: %s has strangely different"
1584 " superblock to %s\n",
1585 bdevname(rdev->bdev,b),
1586 bdevname(refdev->bdev,b2));
1589 ev1 = le64_to_cpu(sb->events);
1590 ev2 = le64_to_cpu(refsb->events);
1597 if (minor_version) {
1598 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9);
1599 sectors -= rdev->data_offset;
1601 sectors = rdev->sb_start;
1602 if (sectors < le64_to_cpu(sb->data_size))
1604 rdev->sectors = le64_to_cpu(sb->data_size);
1608 static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev)
1610 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
1611 __u64 ev1 = le64_to_cpu(sb->events);
1613 rdev->raid_disk = -1;
1614 clear_bit(Faulty, &rdev->flags);
1615 clear_bit(In_sync, &rdev->flags);
1616 clear_bit(WriteMostly, &rdev->flags);
1618 if (mddev->raid_disks == 0) {
1619 mddev->major_version = 1;
1620 mddev->patch_version = 0;
1621 mddev->external = 0;
1622 mddev->chunk_sectors = le32_to_cpu(sb->chunksize);
1623 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1624 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1625 mddev->level = le32_to_cpu(sb->level);
1626 mddev->clevel[0] = 0;
1627 mddev->layout = le32_to_cpu(sb->layout);
1628 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1629 mddev->dev_sectors = le64_to_cpu(sb->size);
1630 mddev->events = ev1;
1631 mddev->bitmap_info.offset = 0;
1632 mddev->bitmap_info.space = 0;
1633 /* Default location for bitmap is 1K after superblock
1634 * using 3K - total of 4K
1636 mddev->bitmap_info.default_offset = 1024 >> 9;
1637 mddev->bitmap_info.default_space = (4096-1024) >> 9;
1638 mddev->reshape_backwards = 0;
1640 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1641 memcpy(mddev->uuid, sb->set_uuid, 16);
1643 mddev->max_disks = (4096-256)/2;
1645 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1646 mddev->bitmap_info.file == NULL) {
1647 mddev->bitmap_info.offset =
1648 (__s32)le32_to_cpu(sb->bitmap_offset);
1649 /* Metadata doesn't record how much space is available.
1650 * For 1.0, we assume we can use up to the superblock
1651 * if before, else to 4K beyond superblock.
1652 * For others, assume no change is possible.
1654 if (mddev->minor_version > 0)
1655 mddev->bitmap_info.space = 0;
1656 else if (mddev->bitmap_info.offset > 0)
1657 mddev->bitmap_info.space =
1658 8 - mddev->bitmap_info.offset;
1660 mddev->bitmap_info.space =
1661 -mddev->bitmap_info.offset;
1664 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1665 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1666 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1667 mddev->new_level = le32_to_cpu(sb->new_level);
1668 mddev->new_layout = le32_to_cpu(sb->new_layout);
1669 mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk);
1670 if (mddev->delta_disks < 0 ||
1671 (mddev->delta_disks == 0 &&
1672 (le32_to_cpu(sb->feature_map)
1673 & MD_FEATURE_RESHAPE_BACKWARDS)))
1674 mddev->reshape_backwards = 1;
1676 mddev->reshape_position = MaxSector;
1677 mddev->delta_disks = 0;
1678 mddev->new_level = mddev->level;
1679 mddev->new_layout = mddev->layout;
1680 mddev->new_chunk_sectors = mddev->chunk_sectors;
1683 } else if (mddev->pers == NULL) {
1684 /* Insist of good event counter while assembling, except for
1685 * spares (which don't need an event count) */
1687 if (rdev->desc_nr >= 0 &&
1688 rdev->desc_nr < le32_to_cpu(sb->max_dev) &&
1689 le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < 0xfffe)
1690 if (ev1 < mddev->events)
1692 } else if (mddev->bitmap) {
1693 /* If adding to array with a bitmap, then we can accept an
1694 * older device, but not too old.
1696 if (ev1 < mddev->bitmap->events_cleared)
1699 if (ev1 < mddev->events)
1700 /* just a hot-add of a new device, leave raid_disk at -1 */
1703 if (mddev->level != LEVEL_MULTIPATH) {
1705 if (rdev->desc_nr < 0 ||
1706 rdev->desc_nr >= le32_to_cpu(sb->max_dev)) {
1710 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1712 case 0xffff: /* spare */
1714 case 0xfffe: /* faulty */
1715 set_bit(Faulty, &rdev->flags);
1718 if ((le32_to_cpu(sb->feature_map) &
1719 MD_FEATURE_RECOVERY_OFFSET))
1720 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1722 set_bit(In_sync, &rdev->flags);
1723 rdev->raid_disk = role;
1726 if (sb->devflags & WriteMostly1)
1727 set_bit(WriteMostly, &rdev->flags);
1728 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_REPLACEMENT)
1729 set_bit(Replacement, &rdev->flags);
1730 } else /* MULTIPATH are always insync */
1731 set_bit(In_sync, &rdev->flags);
1736 static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev)
1738 struct mdp_superblock_1 *sb;
1739 struct md_rdev *rdev2;
1741 /* make rdev->sb match mddev and rdev data. */
1743 sb = page_address(rdev->sb_page);
1745 sb->feature_map = 0;
1747 sb->recovery_offset = cpu_to_le64(0);
1748 memset(sb->pad3, 0, sizeof(sb->pad3));
1750 sb->utime = cpu_to_le64((__u64)mddev->utime);
1751 sb->events = cpu_to_le64(mddev->events);
1753 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1755 sb->resync_offset = cpu_to_le64(0);
1757 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
1759 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
1760 sb->size = cpu_to_le64(mddev->dev_sectors);
1761 sb->chunksize = cpu_to_le32(mddev->chunk_sectors);
1762 sb->level = cpu_to_le32(mddev->level);
1763 sb->layout = cpu_to_le32(mddev->layout);
1765 if (test_bit(WriteMostly, &rdev->flags))
1766 sb->devflags |= WriteMostly1;
1768 sb->devflags &= ~WriteMostly1;
1769 sb->data_offset = cpu_to_le64(rdev->data_offset);
1770 sb->data_size = cpu_to_le64(rdev->sectors);
1772 if (mddev->bitmap && mddev->bitmap_info.file == NULL) {
1773 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset);
1774 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
1777 if (rdev->raid_disk >= 0 &&
1778 !test_bit(In_sync, &rdev->flags)) {
1780 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1781 sb->recovery_offset =
1782 cpu_to_le64(rdev->recovery_offset);
1784 if (test_bit(Replacement, &rdev->flags))
1786 cpu_to_le32(MD_FEATURE_REPLACEMENT);
1788 if (mddev->reshape_position != MaxSector) {
1789 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1790 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1791 sb->new_layout = cpu_to_le32(mddev->new_layout);
1792 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1793 sb->new_level = cpu_to_le32(mddev->new_level);
1794 sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors);
1795 if (mddev->delta_disks == 0 &&
1796 mddev->reshape_backwards)
1798 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS);
1799 if (rdev->new_data_offset != rdev->data_offset) {
1801 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET);
1802 sb->new_offset = cpu_to_le32((__u32)(rdev->new_data_offset
1803 - rdev->data_offset));
1807 if (rdev->badblocks.count == 0)
1808 /* Nothing to do for bad blocks*/ ;
1809 else if (sb->bblog_offset == 0)
1810 /* Cannot record bad blocks on this device */
1811 md_error(mddev, rdev);
1813 struct badblocks *bb = &rdev->badblocks;
1814 u64 *bbp = (u64 *)page_address(rdev->bb_page);
1816 sb->feature_map |= cpu_to_le32(MD_FEATURE_BAD_BLOCKS);
1821 seq = read_seqbegin(&bb->lock);
1823 memset(bbp, 0xff, PAGE_SIZE);
1825 for (i = 0 ; i < bb->count ; i++) {
1826 u64 internal_bb = p[i];
1827 u64 store_bb = ((BB_OFFSET(internal_bb) << 10)
1828 | BB_LEN(internal_bb));
1829 bbp[i] = cpu_to_le64(store_bb);
1832 if (read_seqretry(&bb->lock, seq))
1835 bb->sector = (rdev->sb_start +
1836 (int)le32_to_cpu(sb->bblog_offset));
1837 bb->size = le16_to_cpu(sb->bblog_size);
1842 rdev_for_each(rdev2, mddev)
1843 if (rdev2->desc_nr+1 > max_dev)
1844 max_dev = rdev2->desc_nr+1;
1846 if (max_dev > le32_to_cpu(sb->max_dev)) {
1848 sb->max_dev = cpu_to_le32(max_dev);
1849 rdev->sb_size = max_dev * 2 + 256;
1850 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1851 if (rdev->sb_size & bmask)
1852 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1854 max_dev = le32_to_cpu(sb->max_dev);
1856 for (i=0; i<max_dev;i++)
1857 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1859 rdev_for_each(rdev2, mddev) {
1861 if (test_bit(Faulty, &rdev2->flags))
1862 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1863 else if (test_bit(In_sync, &rdev2->flags))
1864 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1865 else if (rdev2->raid_disk >= 0)
1866 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1868 sb->dev_roles[i] = cpu_to_le16(0xffff);
1871 sb->sb_csum = calc_sb_1_csum(sb);
1874 static unsigned long long
1875 super_1_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
1877 struct mdp_superblock_1 *sb;
1878 sector_t max_sectors;
1879 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1880 return 0; /* component must fit device */
1881 if (rdev->data_offset != rdev->new_data_offset)
1882 return 0; /* too confusing */
1883 if (rdev->sb_start < rdev->data_offset) {
1884 /* minor versions 1 and 2; superblock before data */
1885 max_sectors = i_size_read(rdev->bdev->bd_inode) >> 9;
1886 max_sectors -= rdev->data_offset;
1887 if (!num_sectors || num_sectors > max_sectors)
1888 num_sectors = max_sectors;
1889 } else if (rdev->mddev->bitmap_info.offset) {
1890 /* minor version 0 with bitmap we can't move */
1893 /* minor version 0; superblock after data */
1895 sb_start = (i_size_read(rdev->bdev->bd_inode) >> 9) - 8*2;
1896 sb_start &= ~(sector_t)(4*2 - 1);
1897 max_sectors = rdev->sectors + sb_start - rdev->sb_start;
1898 if (!num_sectors || num_sectors > max_sectors)
1899 num_sectors = max_sectors;
1900 rdev->sb_start = sb_start;
1902 sb = page_address(rdev->sb_page);
1903 sb->data_size = cpu_to_le64(num_sectors);
1904 sb->super_offset = rdev->sb_start;
1905 sb->sb_csum = calc_sb_1_csum(sb);
1906 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1908 md_super_wait(rdev->mddev);
1914 super_1_allow_new_offset(struct md_rdev *rdev,
1915 unsigned long long new_offset)
1917 /* All necessary checks on new >= old have been done */
1918 struct bitmap *bitmap;
1919 if (new_offset >= rdev->data_offset)
1922 /* with 1.0 metadata, there is no metadata to tread on
1923 * so we can always move back */
1924 if (rdev->mddev->minor_version == 0)
1927 /* otherwise we must be sure not to step on
1928 * any metadata, so stay:
1929 * 36K beyond start of superblock
1930 * beyond end of badblocks
1931 * beyond write-intent bitmap
1933 if (rdev->sb_start + (32+4)*2 > new_offset)
1935 bitmap = rdev->mddev->bitmap;
1936 if (bitmap && !rdev->mddev->bitmap_info.file &&
1937 rdev->sb_start + rdev->mddev->bitmap_info.offset +
1938 bitmap->storage.file_pages * (PAGE_SIZE>>9) > new_offset)
1940 if (rdev->badblocks.sector + rdev->badblocks.size > new_offset)
1946 static struct super_type super_types[] = {
1949 .owner = THIS_MODULE,
1950 .load_super = super_90_load,
1951 .validate_super = super_90_validate,
1952 .sync_super = super_90_sync,
1953 .rdev_size_change = super_90_rdev_size_change,
1954 .allow_new_offset = super_90_allow_new_offset,
1958 .owner = THIS_MODULE,
1959 .load_super = super_1_load,
1960 .validate_super = super_1_validate,
1961 .sync_super = super_1_sync,
1962 .rdev_size_change = super_1_rdev_size_change,
1963 .allow_new_offset = super_1_allow_new_offset,
1967 static void sync_super(struct mddev *mddev, struct md_rdev *rdev)
1969 if (mddev->sync_super) {
1970 mddev->sync_super(mddev, rdev);
1974 BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types));
1976 super_types[mddev->major_version].sync_super(mddev, rdev);
1979 static int match_mddev_units(struct mddev *mddev1, struct mddev *mddev2)
1981 struct md_rdev *rdev, *rdev2;
1984 rdev_for_each_rcu(rdev, mddev1)
1985 rdev_for_each_rcu(rdev2, mddev2)
1986 if (rdev->bdev->bd_contains ==
1987 rdev2->bdev->bd_contains) {
1995 static LIST_HEAD(pending_raid_disks);
1998 * Try to register data integrity profile for an mddev
2000 * This is called when an array is started and after a disk has been kicked
2001 * from the array. It only succeeds if all working and active component devices
2002 * are integrity capable with matching profiles.
2004 int md_integrity_register(struct mddev *mddev)
2006 struct md_rdev *rdev, *reference = NULL;
2008 if (list_empty(&mddev->disks))
2009 return 0; /* nothing to do */
2010 if (!mddev->gendisk || blk_get_integrity(mddev->gendisk))
2011 return 0; /* shouldn't register, or already is */
2012 rdev_for_each(rdev, mddev) {
2013 /* skip spares and non-functional disks */
2014 if (test_bit(Faulty, &rdev->flags))
2016 if (rdev->raid_disk < 0)
2019 /* Use the first rdev as the reference */
2023 /* does this rdev's profile match the reference profile? */
2024 if (blk_integrity_compare(reference->bdev->bd_disk,
2025 rdev->bdev->bd_disk) < 0)
2028 if (!reference || !bdev_get_integrity(reference->bdev))
2031 * All component devices are integrity capable and have matching
2032 * profiles, register the common profile for the md device.
2034 if (blk_integrity_register(mddev->gendisk,
2035 bdev_get_integrity(reference->bdev)) != 0) {
2036 printk(KERN_ERR "md: failed to register integrity for %s\n",
2040 printk(KERN_NOTICE "md: data integrity enabled on %s\n", mdname(mddev));
2041 if (bioset_integrity_create(mddev->bio_set, BIO_POOL_SIZE)) {
2042 printk(KERN_ERR "md: failed to create integrity pool for %s\n",
2048 EXPORT_SYMBOL(md_integrity_register);
2050 /* Disable data integrity if non-capable/non-matching disk is being added */
2051 void md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev)
2053 struct blk_integrity *bi_rdev;
2054 struct blk_integrity *bi_mddev;
2056 if (!mddev->gendisk)
2059 bi_rdev = bdev_get_integrity(rdev->bdev);
2060 bi_mddev = blk_get_integrity(mddev->gendisk);
2062 if (!bi_mddev) /* nothing to do */
2064 if (rdev->raid_disk < 0) /* skip spares */
2066 if (bi_rdev && blk_integrity_compare(mddev->gendisk,
2067 rdev->bdev->bd_disk) >= 0)
2069 printk(KERN_NOTICE "disabling data integrity on %s\n", mdname(mddev));
2070 blk_integrity_unregister(mddev->gendisk);
2072 EXPORT_SYMBOL(md_integrity_add_rdev);
2074 static int bind_rdev_to_array(struct md_rdev * rdev, struct mddev * mddev)
2076 char b[BDEVNAME_SIZE];
2086 /* prevent duplicates */
2087 if (find_rdev(mddev, rdev->bdev->bd_dev))
2090 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2091 if (rdev->sectors && (mddev->dev_sectors == 0 ||
2092 rdev->sectors < mddev->dev_sectors)) {
2094 /* Cannot change size, so fail
2095 * If mddev->level <= 0, then we don't care
2096 * about aligning sizes (e.g. linear)
2098 if (mddev->level > 0)
2101 mddev->dev_sectors = rdev->sectors;
2104 /* Verify rdev->desc_nr is unique.
2105 * If it is -1, assign a free number, else
2106 * check number is not in use
2108 if (rdev->desc_nr < 0) {
2110 if (mddev->pers) choice = mddev->raid_disks;
2111 while (find_rdev_nr(mddev, choice))
2113 rdev->desc_nr = choice;
2115 if (find_rdev_nr(mddev, rdev->desc_nr))
2118 if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) {
2119 printk(KERN_WARNING "md: %s: array is limited to %d devices\n",
2120 mdname(mddev), mddev->max_disks);
2123 bdevname(rdev->bdev,b);
2124 while ( (s=strchr(b, '/')) != NULL)
2127 rdev->mddev = mddev;
2128 printk(KERN_INFO "md: bind<%s>\n", b);
2130 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
2133 ko = &part_to_dev(rdev->bdev->bd_part)->kobj;
2134 if (sysfs_create_link(&rdev->kobj, ko, "block"))
2135 /* failure here is OK */;
2136 rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state");
2138 list_add_rcu(&rdev->same_set, &mddev->disks);
2139 bd_link_disk_holder(rdev->bdev, mddev->gendisk);
2141 /* May as well allow recovery to be retried once */
2142 mddev->recovery_disabled++;
2147 printk(KERN_WARNING "md: failed to register dev-%s for %s\n",
2152 static void md_delayed_delete(struct work_struct *ws)
2154 struct md_rdev *rdev = container_of(ws, struct md_rdev, del_work);
2155 kobject_del(&rdev->kobj);
2156 kobject_put(&rdev->kobj);
2159 static void unbind_rdev_from_array(struct md_rdev * rdev)
2161 char b[BDEVNAME_SIZE];
2166 bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk);
2167 list_del_rcu(&rdev->same_set);
2168 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
2170 sysfs_remove_link(&rdev->kobj, "block");
2171 sysfs_put(rdev->sysfs_state);
2172 rdev->sysfs_state = NULL;
2173 rdev->badblocks.count = 0;
2174 /* We need to delay this, otherwise we can deadlock when
2175 * writing to 'remove' to "dev/state". We also need
2176 * to delay it due to rcu usage.
2179 INIT_WORK(&rdev->del_work, md_delayed_delete);
2180 kobject_get(&rdev->kobj);
2181 queue_work(md_misc_wq, &rdev->del_work);
2185 * prevent the device from being mounted, repartitioned or
2186 * otherwise reused by a RAID array (or any other kernel
2187 * subsystem), by bd_claiming the device.
2189 static int lock_rdev(struct md_rdev *rdev, dev_t dev, int shared)
2192 struct block_device *bdev;
2193 char b[BDEVNAME_SIZE];
2195 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
2196 shared ? (struct md_rdev *)lock_rdev : rdev);
2198 printk(KERN_ERR "md: could not open %s.\n",
2199 __bdevname(dev, b));
2200 return PTR_ERR(bdev);
2206 static void unlock_rdev(struct md_rdev *rdev)
2208 struct block_device *bdev = rdev->bdev;
2212 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
2215 void md_autodetect_dev(dev_t dev);
2217 static void export_rdev(struct md_rdev * rdev)
2219 char b[BDEVNAME_SIZE];
2220 printk(KERN_INFO "md: export_rdev(%s)\n",
2221 bdevname(rdev->bdev,b));
2224 md_rdev_clear(rdev);
2226 if (test_bit(AutoDetected, &rdev->flags))
2227 md_autodetect_dev(rdev->bdev->bd_dev);
2230 kobject_put(&rdev->kobj);
2233 static void kick_rdev_from_array(struct md_rdev * rdev)
2235 unbind_rdev_from_array(rdev);
2239 static void export_array(struct mddev *mddev)
2241 struct md_rdev *rdev, *tmp;
2243 rdev_for_each_safe(rdev, tmp, mddev) {
2248 kick_rdev_from_array(rdev);
2250 if (!list_empty(&mddev->disks))
2252 mddev->raid_disks = 0;
2253 mddev->major_version = 0;
2256 static void print_desc(mdp_disk_t *desc)
2258 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
2259 desc->major,desc->minor,desc->raid_disk,desc->state);
2262 static void print_sb_90(mdp_super_t *sb)
2267 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
2268 sb->major_version, sb->minor_version, sb->patch_version,
2269 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
2271 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
2272 sb->level, sb->size, sb->nr_disks, sb->raid_disks,
2273 sb->md_minor, sb->layout, sb->chunk_size);
2274 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
2275 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
2276 sb->utime, sb->state, sb->active_disks, sb->working_disks,
2277 sb->failed_disks, sb->spare_disks,
2278 sb->sb_csum, (unsigned long)sb->events_lo);
2281 for (i = 0; i < MD_SB_DISKS; i++) {
2284 desc = sb->disks + i;
2285 if (desc->number || desc->major || desc->minor ||
2286 desc->raid_disk || (desc->state && (desc->state != 4))) {
2287 printk(" D %2d: ", i);
2291 printk(KERN_INFO "md: THIS: ");
2292 print_desc(&sb->this_disk);
2295 static void print_sb_1(struct mdp_superblock_1 *sb)
2299 uuid = sb->set_uuid;
2301 "md: SB: (V:%u) (F:0x%08x) Array-ID:<%pU>\n"
2302 "md: Name: \"%s\" CT:%llu\n",
2303 le32_to_cpu(sb->major_version),
2304 le32_to_cpu(sb->feature_map),
2307 (unsigned long long)le64_to_cpu(sb->ctime)
2308 & MD_SUPERBLOCK_1_TIME_SEC_MASK);
2310 uuid = sb->device_uuid;
2312 "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu"
2314 "md: Dev:%08x UUID: %pU\n"
2315 "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n"
2316 "md: (MaxDev:%u) \n",
2317 le32_to_cpu(sb->level),
2318 (unsigned long long)le64_to_cpu(sb->size),
2319 le32_to_cpu(sb->raid_disks),
2320 le32_to_cpu(sb->layout),
2321 le32_to_cpu(sb->chunksize),
2322 (unsigned long long)le64_to_cpu(sb->data_offset),
2323 (unsigned long long)le64_to_cpu(sb->data_size),
2324 (unsigned long long)le64_to_cpu(sb->super_offset),
2325 (unsigned long long)le64_to_cpu(sb->recovery_offset),
2326 le32_to_cpu(sb->dev_number),
2329 (unsigned long long)le64_to_cpu(sb->utime) & MD_SUPERBLOCK_1_TIME_SEC_MASK,
2330 (unsigned long long)le64_to_cpu(sb->events),
2331 (unsigned long long)le64_to_cpu(sb->resync_offset),
2332 le32_to_cpu(sb->sb_csum),
2333 le32_to_cpu(sb->max_dev)
2337 static void print_rdev(struct md_rdev *rdev, int major_version)
2339 char b[BDEVNAME_SIZE];
2340 printk(KERN_INFO "md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n",
2341 bdevname(rdev->bdev, b), (unsigned long long)rdev->sectors,
2342 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
2344 if (rdev->sb_loaded) {
2345 printk(KERN_INFO "md: rdev superblock (MJ:%d):\n", major_version);
2346 switch (major_version) {
2348 print_sb_90(page_address(rdev->sb_page));
2351 print_sb_1(page_address(rdev->sb_page));
2355 printk(KERN_INFO "md: no rdev superblock!\n");
2358 static void md_print_devices(void)
2360 struct list_head *tmp;
2361 struct md_rdev *rdev;
2362 struct mddev *mddev;
2363 char b[BDEVNAME_SIZE];
2366 printk("md: **********************************\n");
2367 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
2368 printk("md: **********************************\n");
2369 for_each_mddev(mddev, tmp) {
2372 bitmap_print_sb(mddev->bitmap);
2374 printk("%s: ", mdname(mddev));
2375 rdev_for_each(rdev, mddev)
2376 printk("<%s>", bdevname(rdev->bdev,b));
2379 rdev_for_each(rdev, mddev)
2380 print_rdev(rdev, mddev->major_version);
2382 printk("md: **********************************\n");
2387 static void sync_sbs(struct mddev * mddev, int nospares)
2389 /* Update each superblock (in-memory image), but
2390 * if we are allowed to, skip spares which already
2391 * have the right event counter, or have one earlier
2392 * (which would mean they aren't being marked as dirty
2393 * with the rest of the array)
2395 struct md_rdev *rdev;
2396 rdev_for_each(rdev, mddev) {
2397 if (rdev->sb_events == mddev->events ||
2399 rdev->raid_disk < 0 &&
2400 rdev->sb_events+1 == mddev->events)) {
2401 /* Don't update this superblock */
2402 rdev->sb_loaded = 2;
2404 sync_super(mddev, rdev);
2405 rdev->sb_loaded = 1;
2410 static void md_update_sb(struct mddev * mddev, int force_change)
2412 struct md_rdev *rdev;
2415 int any_badblocks_changed = 0;
2419 set_bit(MD_CHANGE_DEVS, &mddev->flags);
2423 /* First make sure individual recovery_offsets are correct */
2424 rdev_for_each(rdev, mddev) {
2425 if (rdev->raid_disk >= 0 &&
2426 mddev->delta_disks >= 0 &&
2427 !test_bit(In_sync, &rdev->flags) &&
2428 mddev->curr_resync_completed > rdev->recovery_offset)
2429 rdev->recovery_offset = mddev->curr_resync_completed;
2432 if (!mddev->persistent) {
2433 clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
2434 clear_bit(MD_CHANGE_DEVS, &mddev->flags);
2435 if (!mddev->external) {
2436 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2437 rdev_for_each(rdev, mddev) {
2438 if (rdev->badblocks.changed) {
2439 rdev->badblocks.changed = 0;
2440 md_ack_all_badblocks(&rdev->badblocks);
2441 md_error(mddev, rdev);
2443 clear_bit(Blocked, &rdev->flags);
2444 clear_bit(BlockedBadBlocks, &rdev->flags);
2445 wake_up(&rdev->blocked_wait);
2448 wake_up(&mddev->sb_wait);
2452 spin_lock_irq(&mddev->write_lock);
2454 mddev->utime = get_seconds();
2456 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
2458 if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags))
2459 /* just a clean<-> dirty transition, possibly leave spares alone,
2460 * though if events isn't the right even/odd, we will have to do
2466 if (mddev->degraded)
2467 /* If the array is degraded, then skipping spares is both
2468 * dangerous and fairly pointless.
2469 * Dangerous because a device that was removed from the array
2470 * might have a event_count that still looks up-to-date,
2471 * so it can be re-added without a resync.
2472 * Pointless because if there are any spares to skip,
2473 * then a recovery will happen and soon that array won't
2474 * be degraded any more and the spare can go back to sleep then.
2478 sync_req = mddev->in_sync;
2480 /* If this is just a dirty<->clean transition, and the array is clean
2481 * and 'events' is odd, we can roll back to the previous clean state */
2483 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
2484 && mddev->can_decrease_events
2485 && mddev->events != 1) {
2487 mddev->can_decrease_events = 0;
2489 /* otherwise we have to go forward and ... */
2491 mddev->can_decrease_events = nospares;
2494 if (!mddev->events) {
2496 * oops, this 64-bit counter should never wrap.
2497 * Either we are in around ~1 trillion A.C., assuming
2498 * 1 reboot per second, or we have a bug:
2504 rdev_for_each(rdev, mddev) {
2505 if (rdev->badblocks.changed)
2506 any_badblocks_changed++;
2507 if (test_bit(Faulty, &rdev->flags))
2508 set_bit(FaultRecorded, &rdev->flags);
2511 sync_sbs(mddev, nospares);
2512 spin_unlock_irq(&mddev->write_lock);
2514 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2515 mdname(mddev), mddev->in_sync);
2517 bitmap_update_sb(mddev->bitmap);
2518 rdev_for_each(rdev, mddev) {
2519 char b[BDEVNAME_SIZE];
2521 if (rdev->sb_loaded != 1)
2522 continue; /* no noise on spare devices */
2524 if (!test_bit(Faulty, &rdev->flags) &&
2525 rdev->saved_raid_disk == -1) {
2526 md_super_write(mddev,rdev,
2527 rdev->sb_start, rdev->sb_size,
2529 pr_debug("md: (write) %s's sb offset: %llu\n",
2530 bdevname(rdev->bdev, b),
2531 (unsigned long long)rdev->sb_start);
2532 rdev->sb_events = mddev->events;
2533 if (rdev->badblocks.size) {
2534 md_super_write(mddev, rdev,
2535 rdev->badblocks.sector,
2536 rdev->badblocks.size << 9,
2538 rdev->badblocks.size = 0;
2541 } else if (test_bit(Faulty, &rdev->flags))
2542 pr_debug("md: %s (skipping faulty)\n",
2543 bdevname(rdev->bdev, b));
2545 pr_debug("(skipping incremental s/r ");
2547 if (mddev->level == LEVEL_MULTIPATH)
2548 /* only need to write one superblock... */
2551 md_super_wait(mddev);
2552 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2554 spin_lock_irq(&mddev->write_lock);
2555 if (mddev->in_sync != sync_req ||
2556 test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
2557 /* have to write it out again */
2558 spin_unlock_irq(&mddev->write_lock);
2561 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2562 spin_unlock_irq(&mddev->write_lock);
2563 wake_up(&mddev->sb_wait);
2564 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
2565 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
2567 rdev_for_each(rdev, mddev) {
2568 if (test_and_clear_bit(FaultRecorded, &rdev->flags))
2569 clear_bit(Blocked, &rdev->flags);
2571 if (any_badblocks_changed)
2572 md_ack_all_badblocks(&rdev->badblocks);
2573 clear_bit(BlockedBadBlocks, &rdev->flags);
2574 wake_up(&rdev->blocked_wait);
2578 /* words written to sysfs files may, or may not, be \n terminated.
2579 * We want to accept with case. For this we use cmd_match.
2581 static int cmd_match(const char *cmd, const char *str)
2583 /* See if cmd, written into a sysfs file, matches
2584 * str. They must either be the same, or cmd can
2585 * have a trailing newline
2587 while (*cmd && *str && *cmd == *str) {
2598 struct rdev_sysfs_entry {
2599 struct attribute attr;
2600 ssize_t (*show)(struct md_rdev *, char *);
2601 ssize_t (*store)(struct md_rdev *, const char *, size_t);
2605 state_show(struct md_rdev *rdev, char *page)
2610 if (test_bit(Faulty, &rdev->flags) ||
2611 rdev->badblocks.unacked_exist) {
2612 len+= sprintf(page+len, "%sfaulty",sep);
2615 if (test_bit(In_sync, &rdev->flags)) {
2616 len += sprintf(page+len, "%sin_sync",sep);
2619 if (test_bit(WriteMostly, &rdev->flags)) {
2620 len += sprintf(page+len, "%swrite_mostly",sep);
2623 if (test_bit(Blocked, &rdev->flags) ||
2624 (rdev->badblocks.unacked_exist
2625 && !test_bit(Faulty, &rdev->flags))) {
2626 len += sprintf(page+len, "%sblocked", sep);
2629 if (!test_bit(Faulty, &rdev->flags) &&
2630 !test_bit(In_sync, &rdev->flags)) {
2631 len += sprintf(page+len, "%sspare", sep);
2634 if (test_bit(WriteErrorSeen, &rdev->flags)) {
2635 len += sprintf(page+len, "%swrite_error", sep);
2638 if (test_bit(WantReplacement, &rdev->flags)) {
2639 len += sprintf(page+len, "%swant_replacement", sep);
2642 if (test_bit(Replacement, &rdev->flags)) {
2643 len += sprintf(page+len, "%sreplacement", sep);
2647 return len+sprintf(page+len, "\n");
2651 state_store(struct md_rdev *rdev, const char *buf, size_t len)
2654 * faulty - simulates an error
2655 * remove - disconnects the device
2656 * writemostly - sets write_mostly
2657 * -writemostly - clears write_mostly
2658 * blocked - sets the Blocked flags
2659 * -blocked - clears the Blocked and possibly simulates an error
2660 * insync - sets Insync providing device isn't active
2661 * write_error - sets WriteErrorSeen
2662 * -write_error - clears WriteErrorSeen
2665 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
2666 md_error(rdev->mddev, rdev);
2667 if (test_bit(Faulty, &rdev->flags))
2671 } else if (cmd_match(buf, "remove")) {
2672 if (rdev->raid_disk >= 0)
2675 struct mddev *mddev = rdev->mddev;
2676 kick_rdev_from_array(rdev);
2678 md_update_sb(mddev, 1);
2679 md_new_event(mddev);
2682 } else if (cmd_match(buf, "writemostly")) {
2683 set_bit(WriteMostly, &rdev->flags);
2685 } else if (cmd_match(buf, "-writemostly")) {
2686 clear_bit(WriteMostly, &rdev->flags);
2688 } else if (cmd_match(buf, "blocked")) {
2689 set_bit(Blocked, &rdev->flags);
2691 } else if (cmd_match(buf, "-blocked")) {
2692 if (!test_bit(Faulty, &rdev->flags) &&
2693 rdev->badblocks.unacked_exist) {
2694 /* metadata handler doesn't understand badblocks,
2695 * so we need to fail the device
2697 md_error(rdev->mddev, rdev);
2699 clear_bit(Blocked, &rdev->flags);
2700 clear_bit(BlockedBadBlocks, &rdev->flags);
2701 wake_up(&rdev->blocked_wait);
2702 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2703 md_wakeup_thread(rdev->mddev->thread);
2706 } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) {
2707 set_bit(In_sync, &rdev->flags);
2709 } else if (cmd_match(buf, "write_error")) {
2710 set_bit(WriteErrorSeen, &rdev->flags);
2712 } else if (cmd_match(buf, "-write_error")) {
2713 clear_bit(WriteErrorSeen, &rdev->flags);
2715 } else if (cmd_match(buf, "want_replacement")) {
2716 /* Any non-spare device that is not a replacement can
2717 * become want_replacement at any time, but we then need to
2718 * check if recovery is needed.
2720 if (rdev->raid_disk >= 0 &&
2721 !test_bit(Replacement, &rdev->flags))
2722 set_bit(WantReplacement, &rdev->flags);
2723 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2724 md_wakeup_thread(rdev->mddev->thread);
2726 } else if (cmd_match(buf, "-want_replacement")) {
2727 /* Clearing 'want_replacement' is always allowed.
2728 * Once replacements starts it is too late though.
2731 clear_bit(WantReplacement, &rdev->flags);
2732 } else if (cmd_match(buf, "replacement")) {
2733 /* Can only set a device as a replacement when array has not
2734 * yet been started. Once running, replacement is automatic
2735 * from spares, or by assigning 'slot'.
2737 if (rdev->mddev->pers)
2740 set_bit(Replacement, &rdev->flags);
2743 } else if (cmd_match(buf, "-replacement")) {
2744 /* Similarly, can only clear Replacement before start */
2745 if (rdev->mddev->pers)
2748 clear_bit(Replacement, &rdev->flags);
2753 sysfs_notify_dirent_safe(rdev->sysfs_state);
2754 return err ? err : len;
2756 static struct rdev_sysfs_entry rdev_state =
2757 __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store);
2760 errors_show(struct md_rdev *rdev, char *page)
2762 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
2766 errors_store(struct md_rdev *rdev, const char *buf, size_t len)
2769 unsigned long n = simple_strtoul(buf, &e, 10);
2770 if (*buf && (*e == 0 || *e == '\n')) {
2771 atomic_set(&rdev->corrected_errors, n);
2776 static struct rdev_sysfs_entry rdev_errors =
2777 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
2780 slot_show(struct md_rdev *rdev, char *page)
2782 if (rdev->raid_disk < 0)
2783 return sprintf(page, "none\n");
2785 return sprintf(page, "%d\n", rdev->raid_disk);
2789 slot_store(struct md_rdev *rdev, const char *buf, size_t len)
2793 int slot = simple_strtoul(buf, &e, 10);
2794 if (strncmp(buf, "none", 4)==0)
2796 else if (e==buf || (*e && *e!= '\n'))
2798 if (rdev->mddev->pers && slot == -1) {
2799 /* Setting 'slot' on an active array requires also
2800 * updating the 'rd%d' link, and communicating
2801 * with the personality with ->hot_*_disk.
2802 * For now we only support removing
2803 * failed/spare devices. This normally happens automatically,
2804 * but not when the metadata is externally managed.
2806 if (rdev->raid_disk == -1)
2808 /* personality does all needed checks */
2809 if (rdev->mddev->pers->hot_remove_disk == NULL)
2811 clear_bit(Blocked, &rdev->flags);
2812 remove_and_add_spares(rdev->mddev, rdev);
2813 if (rdev->raid_disk >= 0)
2815 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2816 md_wakeup_thread(rdev->mddev->thread);
2817 } else if (rdev->mddev->pers) {
2818 /* Activating a spare .. or possibly reactivating
2819 * if we ever get bitmaps working here.
2822 if (rdev->raid_disk != -1)
2825 if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery))
2828 if (rdev->mddev->pers->hot_add_disk == NULL)
2831 if (slot >= rdev->mddev->raid_disks &&
2832 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
2835 rdev->raid_disk = slot;
2836 if (test_bit(In_sync, &rdev->flags))
2837 rdev->saved_raid_disk = slot;
2839 rdev->saved_raid_disk = -1;
2840 clear_bit(In_sync, &rdev->flags);
2841 err = rdev->mddev->pers->
2842 hot_add_disk(rdev->mddev, rdev);
2844 rdev->raid_disk = -1;
2847 sysfs_notify_dirent_safe(rdev->sysfs_state);
2848 if (sysfs_link_rdev(rdev->mddev, rdev))
2849 /* failure here is OK */;
2850 /* don't wakeup anyone, leave that to userspace. */
2852 if (slot >= rdev->mddev->raid_disks &&
2853 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
2855 rdev->raid_disk = slot;
2856 /* assume it is working */
2857 clear_bit(Faulty, &rdev->flags);
2858 clear_bit(WriteMostly, &rdev->flags);
2859 set_bit(In_sync, &rdev->flags);
2860 sysfs_notify_dirent_safe(rdev->sysfs_state);
2866 static struct rdev_sysfs_entry rdev_slot =
2867 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
2870 offset_show(struct md_rdev *rdev, char *page)
2872 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
2876 offset_store(struct md_rdev *rdev, const char *buf, size_t len)
2878 unsigned long long offset;
2879 if (kstrtoull(buf, 10, &offset) < 0)
2881 if (rdev->mddev->pers && rdev->raid_disk >= 0)
2883 if (rdev->sectors && rdev->mddev->external)
2884 /* Must set offset before size, so overlap checks
2887 rdev->data_offset = offset;
2888 rdev->new_data_offset = offset;
2892 static struct rdev_sysfs_entry rdev_offset =
2893 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
2895 static ssize_t new_offset_show(struct md_rdev *rdev, char *page)
2897 return sprintf(page, "%llu\n",
2898 (unsigned long long)rdev->new_data_offset);
2901 static ssize_t new_offset_store(struct md_rdev *rdev,
2902 const char *buf, size_t len)
2904 unsigned long long new_offset;
2905 struct mddev *mddev = rdev->mddev;
2907 if (kstrtoull(buf, 10, &new_offset) < 0)
2910 if (mddev->sync_thread)
2912 if (new_offset == rdev->data_offset)
2913 /* reset is always permitted */
2915 else if (new_offset > rdev->data_offset) {
2916 /* must not push array size beyond rdev_sectors */
2917 if (new_offset - rdev->data_offset
2918 + mddev->dev_sectors > rdev->sectors)
2921 /* Metadata worries about other space details. */
2923 /* decreasing the offset is inconsistent with a backwards
2926 if (new_offset < rdev->data_offset &&
2927 mddev->reshape_backwards)
2929 /* Increasing offset is inconsistent with forwards
2930 * reshape. reshape_direction should be set to
2931 * 'backwards' first.
2933 if (new_offset > rdev->data_offset &&
2934 !mddev->reshape_backwards)
2937 if (mddev->pers && mddev->persistent &&
2938 !super_types[mddev->major_version]
2939 .allow_new_offset(rdev, new_offset))
2941 rdev->new_data_offset = new_offset;
2942 if (new_offset > rdev->data_offset)
2943 mddev->reshape_backwards = 1;
2944 else if (new_offset < rdev->data_offset)
2945 mddev->reshape_backwards = 0;
2949 static struct rdev_sysfs_entry rdev_new_offset =
2950 __ATTR(new_offset, S_IRUGO|S_IWUSR, new_offset_show, new_offset_store);
2953 rdev_size_show(struct md_rdev *rdev, char *page)
2955 return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2);
2958 static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
2960 /* check if two start/length pairs overlap */
2968 static int strict_blocks_to_sectors(const char *buf, sector_t *sectors)
2970 unsigned long long blocks;
2973 if (kstrtoull(buf, 10, &blocks) < 0)
2976 if (blocks & 1ULL << (8 * sizeof(blocks) - 1))
2977 return -EINVAL; /* sector conversion overflow */
2980 if (new != blocks * 2)
2981 return -EINVAL; /* unsigned long long to sector_t overflow */
2988 rdev_size_store(struct md_rdev *rdev, const char *buf, size_t len)
2990 struct mddev *my_mddev = rdev->mddev;
2991 sector_t oldsectors = rdev->sectors;
2994 if (strict_blocks_to_sectors(buf, §ors) < 0)
2996 if (rdev->data_offset != rdev->new_data_offset)
2997 return -EINVAL; /* too confusing */
2998 if (my_mddev->pers && rdev->raid_disk >= 0) {
2999 if (my_mddev->persistent) {
3000 sectors = super_types[my_mddev->major_version].
3001 rdev_size_change(rdev, sectors);
3004 } else if (!sectors)
3005 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) -
3007 if (!my_mddev->pers->resize)
3008 /* Cannot change size for RAID0 or Linear etc */
3011 if (sectors < my_mddev->dev_sectors)
3012 return -EINVAL; /* component must fit device */
3014 rdev->sectors = sectors;
3015 if (sectors > oldsectors && my_mddev->external) {
3016 /* need to check that all other rdevs with the same ->bdev
3017 * do not overlap. We need to unlock the mddev to avoid
3018 * a deadlock. We have already changed rdev->sectors, and if
3019 * we have to change it back, we will have the lock again.
3021 struct mddev *mddev;
3023 struct list_head *tmp;
3025 mddev_unlock(my_mddev);
3026 for_each_mddev(mddev, tmp) {
3027 struct md_rdev *rdev2;
3029 mddev_lock_nointr(mddev);
3030 rdev_for_each(rdev2, mddev)
3031 if (rdev->bdev == rdev2->bdev &&
3033 overlaps(rdev->data_offset, rdev->sectors,
3039 mddev_unlock(mddev);
3045 mddev_lock_nointr(my_mddev);
3047 /* Someone else could have slipped in a size
3048 * change here, but doing so is just silly.
3049 * We put oldsectors back because we *know* it is
3050 * safe, and trust userspace not to race with
3053 rdev->sectors = oldsectors;
3060 static struct rdev_sysfs_entry rdev_size =
3061 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
3064 static ssize_t recovery_start_show(struct md_rdev *rdev, char *page)
3066 unsigned long long recovery_start = rdev->recovery_offset;
3068 if (test_bit(In_sync, &rdev->flags) ||
3069 recovery_start == MaxSector)
3070 return sprintf(page, "none\n");
3072 return sprintf(page, "%llu\n", recovery_start);
3075 static ssize_t recovery_start_store(struct md_rdev *rdev, const char *buf, size_t len)
3077 unsigned long long recovery_start;
3079 if (cmd_match(buf, "none"))
3080 recovery_start = MaxSector;
3081 else if (kstrtoull(buf, 10, &recovery_start))
3084 if (rdev->mddev->pers &&
3085 rdev->raid_disk >= 0)
3088 rdev->recovery_offset = recovery_start;
3089 if (recovery_start == MaxSector)
3090 set_bit(In_sync, &rdev->flags);
3092 clear_bit(In_sync, &rdev->flags);
3096 static struct rdev_sysfs_entry rdev_recovery_start =
3097 __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store);
3101 badblocks_show(struct badblocks *bb, char *page, int unack);
3103 badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack);
3105 static ssize_t bb_show(struct md_rdev *rdev, char *page)
3107 return badblocks_show(&rdev->badblocks, page, 0);
3109 static ssize_t bb_store(struct md_rdev *rdev, const char *page, size_t len)
3111 int rv = badblocks_store(&rdev->badblocks, page, len, 0);
3112 /* Maybe that ack was all we needed */
3113 if (test_and_clear_bit(BlockedBadBlocks, &rdev->flags))
3114 wake_up(&rdev->blocked_wait);
3117 static struct rdev_sysfs_entry rdev_bad_blocks =
3118 __ATTR(bad_blocks, S_IRUGO|S_IWUSR, bb_show, bb_store);
3121 static ssize_t ubb_show(struct md_rdev *rdev, char *page)
3123 return badblocks_show(&rdev->badblocks, page, 1);
3125 static ssize_t ubb_store(struct md_rdev *rdev, const char *page, size_t len)
3127 return badblocks_store(&rdev->badblocks, page, len, 1);
3129 static struct rdev_sysfs_entry rdev_unack_bad_blocks =
3130 __ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store);
3132 static struct attribute *rdev_default_attrs[] = {
3137 &rdev_new_offset.attr,
3139 &rdev_recovery_start.attr,
3140 &rdev_bad_blocks.attr,
3141 &rdev_unack_bad_blocks.attr,
3145 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
3147 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3148 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3149 struct mddev *mddev = rdev->mddev;
3155 rv = mddev ? mddev_lock(mddev) : -EBUSY;
3157 if (rdev->mddev == NULL)
3160 rv = entry->show(rdev, page);
3161 mddev_unlock(mddev);
3167 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
3168 const char *page, size_t length)
3170 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3171 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3173 struct mddev *mddev = rdev->mddev;
3177 if (!capable(CAP_SYS_ADMIN))
3179 rv = mddev ? mddev_lock(mddev): -EBUSY;
3181 if (rdev->mddev == NULL)
3184 rv = entry->store(rdev, page, length);
3185 mddev_unlock(mddev);
3190 static void rdev_free(struct kobject *ko)
3192 struct md_rdev *rdev = container_of(ko, struct md_rdev, kobj);
3195 static const struct sysfs_ops rdev_sysfs_ops = {
3196 .show = rdev_attr_show,
3197 .store = rdev_attr_store,
3199 static struct kobj_type rdev_ktype = {
3200 .release = rdev_free,
3201 .sysfs_ops = &rdev_sysfs_ops,
3202 .default_attrs = rdev_default_attrs,
3205 int md_rdev_init(struct md_rdev *rdev)
3208 rdev->saved_raid_disk = -1;
3209 rdev->raid_disk = -1;
3211 rdev->data_offset = 0;
3212 rdev->new_data_offset = 0;
3213 rdev->sb_events = 0;
3214 rdev->last_read_error.tv_sec = 0;
3215 rdev->last_read_error.tv_nsec = 0;
3216 rdev->sb_loaded = 0;
3217 rdev->bb_page = NULL;
3218 atomic_set(&rdev->nr_pending, 0);
3219 atomic_set(&rdev->read_errors, 0);
3220 atomic_set(&rdev->corrected_errors, 0);
3222 INIT_LIST_HEAD(&rdev->same_set);
3223 init_waitqueue_head(&rdev->blocked_wait);
3225 /* Add space to store bad block list.
3226 * This reserves the space even on arrays where it cannot
3227 * be used - I wonder if that matters
3229 rdev->badblocks.count = 0;
3230 rdev->badblocks.shift = -1; /* disabled until explicitly enabled */
3231 rdev->badblocks.page = kmalloc(PAGE_SIZE, GFP_KERNEL);
3232 seqlock_init(&rdev->badblocks.lock);
3233 if (rdev->badblocks.page == NULL)
3238 EXPORT_SYMBOL_GPL(md_rdev_init);
3240 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3242 * mark the device faulty if:
3244 * - the device is nonexistent (zero size)
3245 * - the device has no valid superblock
3247 * a faulty rdev _never_ has rdev->sb set.
3249 static struct md_rdev *md_import_device(dev_t newdev, int super_format, int super_minor)
3251 char b[BDEVNAME_SIZE];
3253 struct md_rdev *rdev;
3256 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
3258 printk(KERN_ERR "md: could not alloc mem for new device!\n");
3259 return ERR_PTR(-ENOMEM);
3262 err = md_rdev_init(rdev);
3265 err = alloc_disk_sb(rdev);
3269 err = lock_rdev(rdev, newdev, super_format == -2);
3273 kobject_init(&rdev->kobj, &rdev_ktype);
3275 size = i_size_read(rdev->bdev->bd_inode) >> BLOCK_SIZE_BITS;
3278 "md: %s has zero or unknown size, marking faulty!\n",
3279 bdevname(rdev->bdev,b));
3284 if (super_format >= 0) {
3285 err = super_types[super_format].
3286 load_super(rdev, NULL, super_minor);
3287 if (err == -EINVAL) {
3289 "md: %s does not have a valid v%d.%d "
3290 "superblock, not importing!\n",
3291 bdevname(rdev->bdev,b),
3292 super_format, super_minor);
3297 "md: could not read %s's sb, not importing!\n",
3298 bdevname(rdev->bdev,b));
3308 md_rdev_clear(rdev);
3310 return ERR_PTR(err);
3314 * Check a full RAID array for plausibility
3318 static void analyze_sbs(struct mddev * mddev)
3321 struct md_rdev *rdev, *freshest, *tmp;
3322 char b[BDEVNAME_SIZE];
3325 rdev_for_each_safe(rdev, tmp, mddev)
3326 switch (super_types[mddev->major_version].
3327 load_super(rdev, freshest, mddev->minor_version)) {
3335 "md: fatal superblock inconsistency in %s"
3336 " -- removing from array\n",
3337 bdevname(rdev->bdev,b));
3338 kick_rdev_from_array(rdev);
3342 super_types[mddev->major_version].
3343 validate_super(mddev, freshest);
3346 rdev_for_each_safe(rdev, tmp, mddev) {
3347 if (mddev->max_disks &&
3348 (rdev->desc_nr >= mddev->max_disks ||
3349 i > mddev->max_disks)) {
3351 "md: %s: %s: only %d devices permitted\n",
3352 mdname(mddev), bdevname(rdev->bdev, b),
3354 kick_rdev_from_array(rdev);
3357 if (rdev != freshest)
3358 if (super_types[mddev->major_version].
3359 validate_super(mddev, rdev)) {
3360 printk(KERN_WARNING "md: kicking non-fresh %s"
3362 bdevname(rdev->bdev,b));
3363 kick_rdev_from_array(rdev);
3366 if (mddev->level == LEVEL_MULTIPATH) {
3367 rdev->desc_nr = i++;
3368 rdev->raid_disk = rdev->desc_nr;
3369 set_bit(In_sync, &rdev->flags);
3370 } else if (rdev->raid_disk >= (mddev->raid_disks - min(0, mddev->delta_disks))) {
3371 rdev->raid_disk = -1;
3372 clear_bit(In_sync, &rdev->flags);
3377 /* Read a fixed-point number.
3378 * Numbers in sysfs attributes should be in "standard" units where
3379 * possible, so time should be in seconds.
3380 * However we internally use a a much smaller unit such as
3381 * milliseconds or jiffies.
3382 * This function takes a decimal number with a possible fractional
3383 * component, and produces an integer which is the result of
3384 * multiplying that number by 10^'scale'.
3385 * all without any floating-point arithmetic.
3387 int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale)
3389 unsigned long result = 0;
3391 while (isdigit(*cp) || (*cp == '.' && decimals < 0)) {
3394 else if (decimals < scale) {
3397 result = result * 10 + value;
3409 while (decimals < scale) {
3418 static void md_safemode_timeout(unsigned long data);
3421 safe_delay_show(struct mddev *mddev, char *page)
3423 int msec = (mddev->safemode_delay*1000)/HZ;
3424 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
3427 safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len)
3431 if (strict_strtoul_scaled(cbuf, &msec, 3) < 0)
3434 mddev->safemode_delay = 0;
3436 unsigned long old_delay = mddev->safemode_delay;
3437 mddev->safemode_delay = (msec*HZ)/1000;
3438 if (mddev->safemode_delay == 0)
3439 mddev->safemode_delay = 1;
3440 if (mddev->safemode_delay < old_delay || old_delay == 0)
3441 md_safemode_timeout((unsigned long)mddev);
3445 static struct md_sysfs_entry md_safe_delay =
3446 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
3449 level_show(struct mddev *mddev, char *page)
3451 struct md_personality *p = mddev->pers;
3453 return sprintf(page, "%s\n", p->name);
3454 else if (mddev->clevel[0])
3455 return sprintf(page, "%s\n", mddev->clevel);
3456 else if (mddev->level != LEVEL_NONE)
3457 return sprintf(page, "%d\n", mddev->level);
3463 level_store(struct mddev *mddev, const char *buf, size_t len)
3467 struct md_personality *pers;
3470 struct md_rdev *rdev;
3472 if (mddev->pers == NULL) {
3475 if (len >= sizeof(mddev->clevel))
3477 strncpy(mddev->clevel, buf, len);
3478 if (mddev->clevel[len-1] == '\n')
3480 mddev->clevel[len] = 0;
3481 mddev->level = LEVEL_NONE;
3485 /* request to change the personality. Need to ensure:
3486 * - array is not engaged in resync/recovery/reshape
3487 * - old personality can be suspended
3488 * - new personality will access other array.
3491 if (mddev->sync_thread ||
3492 mddev->reshape_position != MaxSector ||
3493 mddev->sysfs_active)
3496 if (!mddev->pers->quiesce) {
3497 printk(KERN_WARNING "md: %s: %s does not support online personality change\n",
3498 mdname(mddev), mddev->pers->name);
3502 /* Now find the new personality */
3503 if (len == 0 || len >= sizeof(clevel))
3505 strncpy(clevel, buf, len);
3506 if (clevel[len-1] == '\n')
3509 if (kstrtol(clevel, 10, &level))
3512 if (request_module("md-%s", clevel) != 0)
3513 request_module("md-level-%s", clevel);
3514 spin_lock(&pers_lock);
3515 pers = find_pers(level, clevel);
3516 if (!pers || !try_module_get(pers->owner)) {
3517 spin_unlock(&pers_lock);
3518 printk(KERN_WARNING "md: personality %s not loaded\n", clevel);
3521 spin_unlock(&pers_lock);
3523 if (pers == mddev->pers) {
3524 /* Nothing to do! */
3525 module_put(pers->owner);
3528 if (!pers->takeover) {
3529 module_put(pers->owner);
3530 printk(KERN_WARNING "md: %s: %s does not support personality takeover\n",
3531 mdname(mddev), clevel);
3535 rdev_for_each(rdev, mddev)
3536 rdev->new_raid_disk = rdev->raid_disk;
3538 /* ->takeover must set new_* and/or delta_disks
3539 * if it succeeds, and may set them when it fails.
3541 priv = pers->takeover(mddev);
3543 mddev->new_level = mddev->level;
3544 mddev->new_layout = mddev->layout;
3545 mddev->new_chunk_sectors = mddev->chunk_sectors;
3546 mddev->raid_disks -= mddev->delta_disks;
3547 mddev->delta_disks = 0;
3548 mddev->reshape_backwards = 0;
3549 module_put(pers->owner);
3550 printk(KERN_WARNING "md: %s: %s would not accept array\n",
3551 mdname(mddev), clevel);
3552 return PTR_ERR(priv);
3555 /* Looks like we have a winner */
3556 mddev_suspend(mddev);
3557 mddev->pers->stop(mddev);
3559 if (mddev->pers->sync_request == NULL &&
3560 pers->sync_request != NULL) {
3561 /* need to add the md_redundancy_group */
3562 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
3564 "md: cannot register extra attributes for %s\n",
3566 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action");
3568 if (mddev->pers->sync_request != NULL &&
3569 pers->sync_request == NULL) {
3570 /* need to remove the md_redundancy_group */
3571 if (mddev->to_remove == NULL)
3572 mddev->to_remove = &md_redundancy_group;
3575 if (mddev->pers->sync_request == NULL &&
3577 /* We are converting from a no-redundancy array
3578 * to a redundancy array and metadata is managed
3579 * externally so we need to be sure that writes
3580 * won't block due to a need to transition
3582 * until external management is started.
3585 mddev->safemode_delay = 0;
3586 mddev->safemode = 0;
3589 rdev_for_each(rdev, mddev) {
3590 if (rdev->raid_disk < 0)
3592 if (rdev->new_raid_disk >= mddev->raid_disks)
3593 rdev->new_raid_disk = -1;
3594 if (rdev->new_raid_disk == rdev->raid_disk)
3596 sysfs_unlink_rdev(mddev, rdev);
3598 rdev_for_each(rdev, mddev) {
3599 if (rdev->raid_disk < 0)
3601 if (rdev->new_raid_disk == rdev->raid_disk)
3603 rdev->raid_disk = rdev->new_raid_disk;
3604 if (rdev->raid_disk < 0)
3605 clear_bit(In_sync, &rdev->flags);
3607 if (sysfs_link_rdev(mddev, rdev))
3608 printk(KERN_WARNING "md: cannot register rd%d"
3609 " for %s after level change\n",
3610 rdev->raid_disk, mdname(mddev));
3614 module_put(mddev->pers->owner);
3616 mddev->private = priv;
3617 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
3618 mddev->level = mddev->new_level;
3619 mddev->layout = mddev->new_layout;
3620 mddev->chunk_sectors = mddev->new_chunk_sectors;
3621 mddev->delta_disks = 0;
3622 mddev->reshape_backwards = 0;
3623 mddev->degraded = 0;
3624 if (mddev->pers->sync_request == NULL) {
3625 /* this is now an array without redundancy, so
3626 * it must always be in_sync
3629 del_timer_sync(&mddev->safemode_timer);
3631 blk_set_stacking_limits(&mddev->queue->limits);
3633 set_bit(MD_CHANGE_DEVS, &mddev->flags);
3634 mddev_resume(mddev);
3635 sysfs_notify(&mddev->kobj, NULL, "level");
3636 md_new_event(mddev);
3640 static struct md_sysfs_entry md_level =
3641 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
3645 layout_show(struct mddev *mddev, char *page)
3647 /* just a number, not meaningful for all levels */
3648 if (mddev->reshape_position != MaxSector &&
3649 mddev->layout != mddev->new_layout)
3650 return sprintf(page, "%d (%d)\n",
3651 mddev->new_layout, mddev->layout);
3652 return sprintf(page, "%d\n", mddev->layout);
3656 layout_store(struct mddev *mddev, const char *buf, size_t len)
3659 unsigned long n = simple_strtoul(buf, &e, 10);
3661 if (!*buf || (*e && *e != '\n'))
3666 if (mddev->pers->check_reshape == NULL)
3668 mddev->new_layout = n;
3669 err = mddev->pers->check_reshape(mddev);
3671 mddev->new_layout = mddev->layout;
3675 mddev->new_layout = n;
3676 if (mddev->reshape_position == MaxSector)
3681 static struct md_sysfs_entry md_layout =
3682 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
3686 raid_disks_show(struct mddev *mddev, char *page)
3688 if (mddev->raid_disks == 0)
3690 if (mddev->reshape_position != MaxSector &&
3691 mddev->delta_disks != 0)
3692 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
3693 mddev->raid_disks - mddev->delta_disks);
3694 return sprintf(page, "%d\n", mddev->raid_disks);
3697 static int update_raid_disks(struct mddev *mddev, int raid_disks);
3700 raid_disks_store(struct mddev *mddev, const char *buf, size_t len)
3704 unsigned long n = simple_strtoul(buf, &e, 10);
3706 if (!*buf || (*e && *e != '\n'))
3710 rv = update_raid_disks(mddev, n);
3711 else if (mddev->reshape_position != MaxSector) {
3712 struct md_rdev *rdev;
3713 int olddisks = mddev->raid_disks - mddev->delta_disks;
3715 rdev_for_each(rdev, mddev) {
3717 rdev->data_offset < rdev->new_data_offset)
3720 rdev->data_offset > rdev->new_data_offset)
3723 mddev->delta_disks = n - olddisks;
3724 mddev->raid_disks = n;
3725 mddev->reshape_backwards = (mddev->delta_disks < 0);
3727 mddev->raid_disks = n;
3728 return rv ? rv : len;
3730 static struct md_sysfs_entry md_raid_disks =
3731 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
3734 chunk_size_show(struct mddev *mddev, char *page)
3736 if (mddev->reshape_position != MaxSector &&
3737 mddev->chunk_sectors != mddev->new_chunk_sectors)
3738 return sprintf(page, "%d (%d)\n",
3739 mddev->new_chunk_sectors << 9,
3740 mddev->chunk_sectors << 9);
3741 return sprintf(page, "%d\n", mddev->chunk_sectors << 9);
3745 chunk_size_store(struct mddev *mddev, const char *buf, size_t len)
3748 unsigned long n = simple_strtoul(buf, &e, 10);
3750 if (!*buf || (*e && *e != '\n'))
3755 if (mddev->pers->check_reshape == NULL)
3757 mddev->new_chunk_sectors = n >> 9;
3758 err = mddev->pers->check_reshape(mddev);
3760 mddev->new_chunk_sectors = mddev->chunk_sectors;
3764 mddev->new_chunk_sectors = n >> 9;
3765 if (mddev->reshape_position == MaxSector)
3766 mddev->chunk_sectors = n >> 9;
3770 static struct md_sysfs_entry md_chunk_size =
3771 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
3774 resync_start_show(struct mddev *mddev, char *page)
3776 if (mddev->recovery_cp == MaxSector)
3777 return sprintf(page, "none\n");
3778 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
3782 resync_start_store(struct mddev *mddev, const char *buf, size_t len)
3785 unsigned long long n = simple_strtoull(buf, &e, 10);
3787 if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
3789 if (cmd_match(buf, "none"))
3791 else if (!*buf || (*e && *e != '\n'))
3794 mddev->recovery_cp = n;
3796 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
3799 static struct md_sysfs_entry md_resync_start =
3800 __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store);
3803 * The array state can be:
3806 * No devices, no size, no level
3807 * Equivalent to STOP_ARRAY ioctl
3809 * May have some settings, but array is not active
3810 * all IO results in error
3811 * When written, doesn't tear down array, but just stops it
3812 * suspended (not supported yet)
3813 * All IO requests will block. The array can be reconfigured.
3814 * Writing this, if accepted, will block until array is quiescent
3816 * no resync can happen. no superblocks get written.
3817 * write requests fail
3819 * like readonly, but behaves like 'clean' on a write request.
3821 * clean - no pending writes, but otherwise active.
3822 * When written to inactive array, starts without resync
3823 * If a write request arrives then
3824 * if metadata is known, mark 'dirty' and switch to 'active'.
3825 * if not known, block and switch to write-pending
3826 * If written to an active array that has pending writes, then fails.
3828 * fully active: IO and resync can be happening.
3829 * When written to inactive array, starts with resync
3832 * clean, but writes are blocked waiting for 'active' to be written.
3835 * like active, but no writes have been seen for a while (100msec).
3838 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
3839 write_pending, active_idle, bad_word};
3840 static char *array_states[] = {
3841 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3842 "write-pending", "active-idle", NULL };
3844 static int match_word(const char *word, char **list)
3847 for (n=0; list[n]; n++)
3848 if (cmd_match(word, list[n]))
3854 array_state_show(struct mddev *mddev, char *page)
3856 enum array_state st = inactive;
3869 else if (test_bit(MD_CHANGE_PENDING, &mddev->flags))
3871 else if (mddev->safemode)
3877 if (list_empty(&mddev->disks) &&
3878 mddev->raid_disks == 0 &&
3879 mddev->dev_sectors == 0)
3884 return sprintf(page, "%s\n", array_states[st]);
3887 static int do_md_stop(struct mddev * mddev, int ro, struct block_device *bdev);
3888 static int md_set_readonly(struct mddev * mddev, struct block_device *bdev);
3889 static int do_md_run(struct mddev * mddev);
3890 static int restart_array(struct mddev *mddev);
3893 array_state_store(struct mddev *mddev, const char *buf, size_t len)
3896 enum array_state st = match_word(buf, array_states);
3901 /* stopping an active array */
3902 err = do_md_stop(mddev, 0, NULL);
3905 /* stopping an active array */
3907 err = do_md_stop(mddev, 2, NULL);
3909 err = 0; /* already inactive */
3912 break; /* not supported yet */
3915 err = md_set_readonly(mddev, NULL);
3918 set_disk_ro(mddev->gendisk, 1);
3919 err = do_md_run(mddev);
3925 err = md_set_readonly(mddev, NULL);
3926 else if (mddev->ro == 1)
3927 err = restart_array(mddev);
3930 set_disk_ro(mddev->gendisk, 0);
3934 err = do_md_run(mddev);
3939 restart_array(mddev);
3940 spin_lock_irq(&mddev->write_lock);
3941 if (atomic_read(&mddev->writes_pending) == 0) {
3942 if (mddev->in_sync == 0) {
3944 if (mddev->safemode == 1)
3945 mddev->safemode = 0;
3946 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
3951 spin_unlock_irq(&mddev->write_lock);
3957 restart_array(mddev);
3958 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
3959 wake_up(&mddev->sb_wait);
3963 set_disk_ro(mddev->gendisk, 0);
3964 err = do_md_run(mddev);
3969 /* these cannot be set */
3975 if (mddev->hold_active == UNTIL_IOCTL)
3976 mddev->hold_active = 0;
3977 sysfs_notify_dirent_safe(mddev->sysfs_state);
3981 static struct md_sysfs_entry md_array_state =
3982 __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
3985 max_corrected_read_errors_show(struct mddev *mddev, char *page) {
3986 return sprintf(page, "%d\n",
3987 atomic_read(&mddev->max_corr_read_errors));
3991 max_corrected_read_errors_store(struct mddev *mddev, const char *buf, size_t len)
3994 unsigned long n = simple_strtoul(buf, &e, 10);
3996 if (*buf && (*e == 0 || *e == '\n')) {
3997 atomic_set(&mddev->max_corr_read_errors, n);
4003 static struct md_sysfs_entry max_corr_read_errors =
4004 __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show,
4005 max_corrected_read_errors_store);
4008 null_show(struct mddev *mddev, char *page)
4014 new_dev_store(struct mddev *mddev, const char *buf, size_t len)
4016 /* buf must be %d:%d\n? giving major and minor numbers */
4017 /* The new device is added to the array.
4018 * If the array has a persistent superblock, we read the
4019 * superblock to initialise info and check validity.
4020 * Otherwise, only checking done is that in bind_rdev_to_array,
4021 * which mainly checks size.
4024 int major = simple_strtoul(buf, &e, 10);
4027 struct md_rdev *rdev;
4030 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
4032 minor = simple_strtoul(e+1, &e, 10);
4033 if (*e && *e != '\n')
4035 dev = MKDEV(major, minor);
4036 if (major != MAJOR(dev) ||
4037 minor != MINOR(dev))
4041 if (mddev->persistent) {
4042 rdev = md_import_device(dev, mddev->major_version,
4043 mddev->minor_version);
4044 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
4045 struct md_rdev *rdev0
4046 = list_entry(mddev->disks.next,
4047 struct md_rdev, same_set);
4048 err = super_types[mddev->major_version]
4049 .load_super(rdev, rdev0, mddev->minor_version);
4053 } else if (mddev->external)
4054 rdev = md_import_device(dev, -2, -1);
4056 rdev = md_import_device(dev, -1, -1);
4059 return PTR_ERR(rdev);
4060 err = bind_rdev_to_array(rdev, mddev);
4064 return err ? err : len;
4067 static struct md_sysfs_entry md_new_device =
4068 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
4071 bitmap_store(struct mddev *mddev, const char *buf, size_t len)
4074 unsigned long chunk, end_chunk;
4078 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
4080 chunk = end_chunk = simple_strtoul(buf, &end, 0);
4081 if (buf == end) break;
4082 if (*end == '-') { /* range */
4084 end_chunk = simple_strtoul(buf, &end, 0);
4085 if (buf == end) break;
4087 if (*end && !isspace(*end)) break;
4088 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
4089 buf = skip_spaces(end);
4091 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
4096 static struct md_sysfs_entry md_bitmap =
4097 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
4100 size_show(struct mddev *mddev, char *page)
4102 return sprintf(page, "%llu\n",
4103 (unsigned long long)mddev->dev_sectors / 2);
4106 static int update_size(struct mddev *mddev, sector_t num_sectors);
4109 size_store(struct mddev *mddev, const char *buf, size_t len)
4111 /* If array is inactive, we can reduce the component size, but
4112 * not increase it (except from 0).
4113 * If array is active, we can try an on-line resize
4116 int err = strict_blocks_to_sectors(buf, §ors);
4121 err = update_size(mddev, sectors);
4122 md_update_sb(mddev, 1);
4124 if (mddev->dev_sectors == 0 ||
4125 mddev->dev_sectors > sectors)
4126 mddev->dev_sectors = sectors;
4130 return err ? err : len;
4133 static struct md_sysfs_entry md_size =
4134 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
4137 /* Metadata version.
4139 * 'none' for arrays with no metadata (good luck...)
4140 * 'external' for arrays with externally managed metadata,
4141 * or N.M for internally known formats
4144 metadata_show(struct mddev *mddev, char *page)
4146 if (mddev->persistent)
4147 return sprintf(page, "%d.%d\n",
4148 mddev->major_version, mddev->minor_version);
4149 else if (mddev->external)
4150 return sprintf(page, "external:%s\n", mddev->metadata_type);
4152 return sprintf(page, "none\n");
4156 metadata_store(struct mddev *mddev, const char *buf, size_t len)
4160 /* Changing the details of 'external' metadata is
4161 * always permitted. Otherwise there must be
4162 * no devices attached to the array.
4164 if (mddev->external && strncmp(buf, "external:", 9) == 0)
4166 else if (!list_empty(&mddev->disks))
4169 if (cmd_match(buf, "none")) {
4170 mddev->persistent = 0;
4171 mddev->external = 0;
4172 mddev->major_version = 0;
4173 mddev->minor_version = 90;
4176 if (strncmp(buf, "external:", 9) == 0) {
4177 size_t namelen = len-9;
4178 if (namelen >= sizeof(mddev->metadata_type))
4179 namelen = sizeof(mddev->metadata_type)-1;
4180 strncpy(mddev->metadata_type, buf+9, namelen);
4181 mddev->metadata_type[namelen] = 0;
4182 if (namelen && mddev->metadata_type[namelen-1] == '\n')
4183 mddev->metadata_type[--namelen] = 0;
4184 mddev->persistent = 0;
4185 mddev->external = 1;
4186 mddev->major_version = 0;
4187 mddev->minor_version = 90;
4190 major = simple_strtoul(buf, &e, 10);
4191 if (e==buf || *e != '.')
4194 minor = simple_strtoul(buf, &e, 10);
4195 if (e==buf || (*e && *e != '\n') )
4197 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
4199 mddev->major_version = major;
4200 mddev->minor_version = minor;
4201 mddev->persistent = 1;
4202 mddev->external = 0;
4206 static struct md_sysfs_entry md_metadata =
4207 __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
4210 action_show(struct mddev *mddev, char *page)
4212 char *type = "idle";
4213 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
4215 else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
4216 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) {
4217 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
4219 else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
4220 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
4222 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
4226 } else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
4229 return sprintf(page, "%s\n", type);
4233 action_store(struct mddev *mddev, const char *page, size_t len)
4235 if (!mddev->pers || !mddev->pers->sync_request)
4238 if (cmd_match(page, "frozen"))
4239 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4241 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4243 if (cmd_match(page, "idle") || cmd_match(page, "frozen")) {
4244 if (mddev->sync_thread) {
4245 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4246 md_reap_sync_thread(mddev);
4248 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
4249 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
4251 else if (cmd_match(page, "resync"))
4252 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4253 else if (cmd_match(page, "recover")) {
4254 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
4255 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4256 } else if (cmd_match(page, "reshape")) {
4258 if (mddev->pers->start_reshape == NULL)
4260 err = mddev->pers->start_reshape(mddev);
4263 sysfs_notify(&mddev->kobj, NULL, "degraded");
4265 if (cmd_match(page, "check"))
4266 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
4267 else if (!cmd_match(page, "repair"))
4269 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
4270 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
4272 if (mddev->ro == 2) {
4273 /* A write to sync_action is enough to justify
4274 * canceling read-auto mode
4277 md_wakeup_thread(mddev->sync_thread);
4279 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4280 md_wakeup_thread(mddev->thread);
4281 sysfs_notify_dirent_safe(mddev->sysfs_action);
4285 static struct md_sysfs_entry md_scan_mode =
4286 __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
4289 last_sync_action_show(struct mddev *mddev, char *page)
4291 return sprintf(page, "%s\n", mddev->last_sync_action);
4294 static struct md_sysfs_entry md_last_scan_mode = __ATTR_RO(last_sync_action);
4297 mismatch_cnt_show(struct mddev *mddev, char *page)
4299 return sprintf(page, "%llu\n",
4300 (unsigned long long)
4301 atomic64_read(&mddev->resync_mismatches));
4304 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
4307 sync_min_show(struct mddev *mddev, char *page)
4309 return sprintf(page, "%d (%s)\n", speed_min(mddev),
4310 mddev->sync_speed_min ? "local": "system");
4314 sync_min_store(struct mddev *mddev, const char *buf, size_t len)
4318 if (strncmp(buf, "system", 6)==0) {
4319 mddev->sync_speed_min = 0;
4322 min = simple_strtoul(buf, &e, 10);
4323 if (buf == e || (*e && *e != '\n') || min <= 0)
4325 mddev->sync_speed_min = min;
4329 static struct md_sysfs_entry md_sync_min =
4330 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
4333 sync_max_show(struct mddev *mddev, char *page)
4335 return sprintf(page, "%d (%s)\n", speed_max(mddev),
4336 mddev->sync_speed_max ? "local": "system");
4340 sync_max_store(struct mddev *mddev, const char *buf, size_t len)
4344 if (strncmp(buf, "system", 6)==0) {
4345 mddev->sync_speed_max = 0;
4348 max = simple_strtoul(buf, &e, 10);
4349 if (buf == e || (*e && *e != '\n') || max <= 0)
4351 mddev->sync_speed_max = max;
4355 static struct md_sysfs_entry md_sync_max =
4356 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
4359 degraded_show(struct mddev *mddev, char *page)
4361 return sprintf(page, "%d\n", mddev->degraded);
4363 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
4366 sync_force_parallel_show(struct mddev *mddev, char *page)
4368 return sprintf(page, "%d\n", mddev->parallel_resync);
4372 sync_force_parallel_store(struct mddev *mddev, const char *buf, size_t len)
4376 if (kstrtol(buf, 10, &n))
4379 if (n != 0 && n != 1)
4382 mddev->parallel_resync = n;
4384 if (mddev->sync_thread)
4385 wake_up(&resync_wait);
4390 /* force parallel resync, even with shared block devices */
4391 static struct md_sysfs_entry md_sync_force_parallel =
4392 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
4393 sync_force_parallel_show, sync_force_parallel_store);
4396 sync_speed_show(struct mddev *mddev, char *page)
4398 unsigned long resync, dt, db;
4399 if (mddev->curr_resync == 0)
4400 return sprintf(page, "none\n");
4401 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
4402 dt = (jiffies - mddev->resync_mark) / HZ;
4404 db = resync - mddev->resync_mark_cnt;
4405 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
4408 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
4411 sync_completed_show(struct mddev *mddev, char *page)
4413 unsigned long long max_sectors, resync;
4415 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4416 return sprintf(page, "none\n");
4418 if (mddev->curr_resync == 1 ||
4419 mddev->curr_resync == 2)
4420 return sprintf(page, "delayed\n");
4422 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
4423 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
4424 max_sectors = mddev->resync_max_sectors;
4426 max_sectors = mddev->dev_sectors;
4428 resync = mddev->curr_resync_completed;
4429 return sprintf(page, "%llu / %llu\n", resync, max_sectors);
4432 static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed);
4435 min_sync_show(struct mddev *mddev, char *page)
4437 return sprintf(page, "%llu\n",
4438 (unsigned long long)mddev->resync_min);
4441 min_sync_store(struct mddev *mddev, const char *buf, size_t len)
4443 unsigned long long min;
4444 if (kstrtoull(buf, 10, &min))
4446 if (min > mddev->resync_max)
4448 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4451 /* Must be a multiple of chunk_size */
4452 if (mddev->chunk_sectors) {
4453 sector_t temp = min;
4454 if (sector_div(temp, mddev->chunk_sectors))
4457 mddev->resync_min = min;
4462 static struct md_sysfs_entry md_min_sync =
4463 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
4466 max_sync_show(struct mddev *mddev, char *page)
4468 if (mddev->resync_max == MaxSector)
4469 return sprintf(page, "max\n");
4471 return sprintf(page, "%llu\n",
4472 (unsigned long long)mddev->resync_max);
4475 max_sync_store(struct mddev *mddev, const char *buf, size_t len)
4477 if (strncmp(buf, "max", 3) == 0)
4478 mddev->resync_max = MaxSector;
4480 unsigned long long max;
4481 if (kstrtoull(buf, 10, &max))
4483 if (max < mddev->resync_min)
4485 if (max < mddev->resync_max &&
4487 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4490 /* Must be a multiple of chunk_size */
4491 if (mddev->chunk_sectors) {
4492 sector_t temp = max;
4493 if (sector_div(temp, mddev->chunk_sectors))
4496 mddev->resync_max = max;
4498 wake_up(&mddev->recovery_wait);
4502 static struct md_sysfs_entry md_max_sync =
4503 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
4506 suspend_lo_show(struct mddev *mddev, char *page)
4508 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
4512 suspend_lo_store(struct mddev *mddev, const char *buf, size_t len)
4515 unsigned long long new = simple_strtoull(buf, &e, 10);
4516 unsigned long long old = mddev->suspend_lo;
4518 if (mddev->pers == NULL ||
4519 mddev->pers->quiesce == NULL)
4521 if (buf == e || (*e && *e != '\n'))
4524 mddev->suspend_lo = new;
4526 /* Shrinking suspended region */
4527 mddev->pers->quiesce(mddev, 2);
4529 /* Expanding suspended region - need to wait */
4530 mddev->pers->quiesce(mddev, 1);
4531 mddev->pers->quiesce(mddev, 0);
4535 static struct md_sysfs_entry md_suspend_lo =
4536 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
4540 suspend_hi_show(struct mddev *mddev, char *page)
4542 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
4546 suspend_hi_store(struct mddev *mddev, const char *buf, size_t len)
4549 unsigned long long new = simple_strtoull(buf, &e, 10);
4550 unsigned long long old = mddev->suspend_hi;
4552 if (mddev->pers == NULL ||
4553 mddev->pers->quiesce == NULL)
4555 if (buf == e || (*e && *e != '\n'))
4558 mddev->suspend_hi = new;
4560 /* Shrinking suspended region */
4561 mddev->pers->quiesce(mddev, 2);
4563 /* Expanding suspended region - need to wait */
4564 mddev->pers->quiesce(mddev, 1);
4565 mddev->pers->quiesce(mddev, 0);
4569 static struct md_sysfs_entry md_suspend_hi =
4570 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
4573 reshape_position_show(struct mddev *mddev, char *page)
4575 if (mddev->reshape_position != MaxSector)
4576 return sprintf(page, "%llu\n",
4577 (unsigned long long)mddev->reshape_position);
4578 strcpy(page, "none\n");
4583 reshape_position_store(struct mddev *mddev, const char *buf, size_t len)
4585 struct md_rdev *rdev;
4587 unsigned long long new = simple_strtoull(buf, &e, 10);
4590 if (buf == e || (*e && *e != '\n'))
4592 mddev->reshape_position = new;
4593 mddev->delta_disks = 0;
4594 mddev->reshape_backwards = 0;
4595 mddev->new_level = mddev->level;
4596 mddev->new_layout = mddev->layout;
4597 mddev->new_chunk_sectors = mddev->chunk_sectors;
4598 rdev_for_each(rdev, mddev)
4599 rdev->new_data_offset = rdev->data_offset;
4603 static struct md_sysfs_entry md_reshape_position =
4604 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
4605 reshape_position_store);
4608 reshape_direction_show(struct mddev *mddev, char *page)
4610 return sprintf(page, "%s\n",
4611 mddev->reshape_backwards ? "backwards" : "forwards");
4615 reshape_direction_store(struct mddev *mddev, const char *buf, size_t len)
4618 if (cmd_match(buf, "forwards"))
4620 else if (cmd_match(buf, "backwards"))
4624 if (mddev->reshape_backwards == backwards)
4627 /* check if we are allowed to change */
4628 if (mddev->delta_disks)
4631 if (mddev->persistent &&
4632 mddev->major_version == 0)
4635 mddev->reshape_backwards = backwards;
4639 static struct md_sysfs_entry md_reshape_direction =
4640 __ATTR(reshape_direction, S_IRUGO|S_IWUSR, reshape_direction_show,
4641 reshape_direction_store);
4644 array_size_show(struct mddev *mddev, char *page)
4646 if (mddev->external_size)
4647 return sprintf(page, "%llu\n",
4648 (unsigned long long)mddev->array_sectors/2);
4650 return sprintf(page, "default\n");
4654 array_size_store(struct mddev *mddev, const char *buf, size_t len)
4658 if (strncmp(buf, "default", 7) == 0) {
4660 sectors = mddev->pers->size(mddev, 0, 0);
4662 sectors = mddev->array_sectors;
4664 mddev->external_size = 0;
4666 if (strict_blocks_to_sectors(buf, §ors) < 0)
4668 if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors)
4671 mddev->external_size = 1;
4674 mddev->array_sectors = sectors;
4676 set_capacity(mddev->gendisk, mddev->array_sectors);
4677 revalidate_disk(mddev->gendisk);
4682 static struct md_sysfs_entry md_array_size =
4683 __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show,
4686 static struct attribute *md_default_attrs[] = {
4689 &md_raid_disks.attr,
4690 &md_chunk_size.attr,
4692 &md_resync_start.attr,
4694 &md_new_device.attr,
4695 &md_safe_delay.attr,
4696 &md_array_state.attr,
4697 &md_reshape_position.attr,
4698 &md_reshape_direction.attr,
4699 &md_array_size.attr,
4700 &max_corr_read_errors.attr,
4704 static struct attribute *md_redundancy_attrs[] = {
4706 &md_last_scan_mode.attr,
4707 &md_mismatches.attr,
4710 &md_sync_speed.attr,
4711 &md_sync_force_parallel.attr,
4712 &md_sync_completed.attr,
4715 &md_suspend_lo.attr,
4716 &md_suspend_hi.attr,
4721 static struct attribute_group md_redundancy_group = {
4723 .attrs = md_redundancy_attrs,
4728 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
4730 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
4731 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
4736 spin_lock(&all_mddevs_lock);
4737 if (list_empty(&mddev->all_mddevs)) {
4738 spin_unlock(&all_mddevs_lock);
4742 spin_unlock(&all_mddevs_lock);
4744 rv = mddev_lock(mddev);
4746 rv = entry->show(mddev, page);
4747 mddev_unlock(mddev);
4754 md_attr_store(struct kobject *kobj, struct attribute *attr,
4755 const char *page, size_t length)
4757 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
4758 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
4763 if (!capable(CAP_SYS_ADMIN))
4765 spin_lock(&all_mddevs_lock);
4766 if (list_empty(&mddev->all_mddevs)) {
4767 spin_unlock(&all_mddevs_lock);
4771 spin_unlock(&all_mddevs_lock);
4772 if (entry->store == new_dev_store)
4773 flush_workqueue(md_misc_wq);
4774 rv = mddev_lock(mddev);
4776 rv = entry->store(mddev, page, length);
4777 mddev_unlock(mddev);
4783 static void md_free(struct kobject *ko)
4785 struct mddev *mddev = container_of(ko, struct mddev, kobj);
4787 if (mddev->sysfs_state)
4788 sysfs_put(mddev->sysfs_state);
4790 if (mddev->gendisk) {
4791 del_gendisk(mddev->gendisk);
4792 put_disk(mddev->gendisk);
4795 blk_cleanup_queue(mddev->queue);
4800 static const struct sysfs_ops md_sysfs_ops = {
4801 .show = md_attr_show,
4802 .store = md_attr_store,
4804 static struct kobj_type md_ktype = {
4806 .sysfs_ops = &md_sysfs_ops,
4807 .default_attrs = md_default_attrs,
4812 static void mddev_delayed_delete(struct work_struct *ws)
4814 struct mddev *mddev = container_of(ws, struct mddev, del_work);
4816 sysfs_remove_group(&mddev->kobj, &md_bitmap_group);
4817 kobject_del(&mddev->kobj);
4818 kobject_put(&mddev->kobj);
4821 static int md_alloc(dev_t dev, char *name)
4823 static DEFINE_MUTEX(disks_mutex);
4824 struct mddev *mddev = mddev_find(dev);
4825 struct gendisk *disk;
4834 partitioned = (MAJOR(mddev->unit) != MD_MAJOR);
4835 shift = partitioned ? MdpMinorShift : 0;
4836 unit = MINOR(mddev->unit) >> shift;
4838 /* wait for any previous instance of this device to be
4839 * completely removed (mddev_delayed_delete).
4841 flush_workqueue(md_misc_wq);
4843 mutex_lock(&disks_mutex);
4849 /* Need to ensure that 'name' is not a duplicate.
4851 struct mddev *mddev2;
4852 spin_lock(&all_mddevs_lock);
4854 list_for_each_entry(mddev2, &all_mddevs, all_mddevs)
4855 if (mddev2->gendisk &&
4856 strcmp(mddev2->gendisk->disk_name, name) == 0) {
4857 spin_unlock(&all_mddevs_lock);
4860 spin_unlock(&all_mddevs_lock);
4864 mddev->queue = blk_alloc_queue(GFP_KERNEL);
4867 mddev->queue->queuedata = mddev;
4869 blk_queue_make_request(mddev->queue, md_make_request);
4870 blk_set_stacking_limits(&mddev->queue->limits);
4872 disk = alloc_disk(1 << shift);
4874 blk_cleanup_queue(mddev->queue);
4875 mddev->queue = NULL;
4878 disk->major = MAJOR(mddev->unit);
4879 disk->first_minor = unit << shift;
4881 strcpy(disk->disk_name, name);
4882 else if (partitioned)
4883 sprintf(disk->disk_name, "md_d%d", unit);
4885 sprintf(disk->disk_name, "md%d", unit);
4886 disk->fops = &md_fops;
4887 disk->private_data = mddev;
4888 disk->queue = mddev->queue;
4889 blk_queue_flush(mddev->queue, REQ_FLUSH | REQ_FUA);
4890 /* Allow extended partitions. This makes the
4891 * 'mdp' device redundant, but we can't really
4894 disk->flags |= GENHD_FL_EXT_DEVT;
4895 mddev->gendisk = disk;
4896 /* As soon as we call add_disk(), another thread could get
4897 * through to md_open, so make sure it doesn't get too far
4899 mutex_lock(&mddev->open_mutex);
4902 error = kobject_init_and_add(&mddev->kobj, &md_ktype,
4903 &disk_to_dev(disk)->kobj, "%s", "md");
4905 /* This isn't possible, but as kobject_init_and_add is marked
4906 * __must_check, we must do something with the result
4908 printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
4912 if (mddev->kobj.sd &&
4913 sysfs_create_group(&mddev->kobj, &md_bitmap_group))
4914 printk(KERN_DEBUG "pointless warning\n");
4915 mutex_unlock(&mddev->open_mutex);
4917 mutex_unlock(&disks_mutex);
4918 if (!error && mddev->kobj.sd) {
4919 kobject_uevent(&mddev->kobj, KOBJ_ADD);
4920 mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state");
4926 static struct kobject *md_probe(dev_t dev, int *part, void *data)
4928 md_alloc(dev, NULL);
4932 static int add_named_array(const char *val, struct kernel_param *kp)
4934 /* val must be "md_*" where * is not all digits.
4935 * We allocate an array with a large free minor number, and
4936 * set the name to val. val must not already be an active name.
4938 int len = strlen(val);
4939 char buf[DISK_NAME_LEN];
4941 while (len && val[len-1] == '\n')
4943 if (len >= DISK_NAME_LEN)
4945 strlcpy(buf, val, len+1);
4946 if (strncmp(buf, "md_", 3) != 0)
4948 return md_alloc(0, buf);
4951 static void md_safemode_timeout(unsigned long data)
4953 struct mddev *mddev = (struct mddev *) data;
4955 if (!atomic_read(&mddev->writes_pending)) {
4956 mddev->safemode = 1;
4957 if (mddev->external)
4958 sysfs_notify_dirent_safe(mddev->sysfs_state);
4960 md_wakeup_thread(mddev->thread);
4963 static int start_dirty_degraded;
4965 int md_run(struct mddev *mddev)
4968 struct md_rdev *rdev;
4969 struct md_personality *pers;
4971 if (list_empty(&mddev->disks))
4972 /* cannot run an array with no devices.. */
4977 /* Cannot run until previous stop completes properly */
4978 if (mddev->sysfs_active)
4982 * Analyze all RAID superblock(s)
4984 if (!mddev->raid_disks) {
4985 if (!mddev->persistent)
4990 if (mddev->level != LEVEL_NONE)
4991 request_module("md-level-%d", mddev->level);
4992 else if (mddev->clevel[0])
4993 request_module("md-%s", mddev->clevel);
4996 * Drop all container device buffers, from now on
4997 * the only valid external interface is through the md
5000 rdev_for_each(rdev, mddev) {
5001 if (test_bit(Faulty, &rdev->flags))
5003 sync_blockdev(rdev->bdev);
5004 invalidate_bdev(rdev->bdev);
5006 /* perform some consistency tests on the device.
5007 * We don't want the data to overlap the metadata,
5008 * Internal Bitmap issues have been handled elsewhere.
5010 if (rdev->meta_bdev) {
5011 /* Nothing to check */;
5012 } else if (rdev->data_offset < rdev->sb_start) {
5013 if (mddev->dev_sectors &&
5014 rdev->data_offset + mddev->dev_sectors
5016 printk("md: %s: data overlaps metadata\n",
5021 if (rdev->sb_start + rdev->sb_size/512
5022 > rdev->data_offset) {
5023 printk("md: %s: metadata overlaps data\n",
5028 sysfs_notify_dirent_safe(rdev->sysfs_state);
5031 if (mddev->bio_set == NULL)
5032 mddev->bio_set = bioset_create(BIO_POOL_SIZE, 0);
5034 spin_lock(&pers_lock);
5035 pers = find_pers(mddev->level, mddev->clevel);
5036 if (!pers || !try_module_get(pers->owner)) {
5037 spin_unlock(&pers_lock);
5038 if (mddev->level != LEVEL_NONE)
5039 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
5042 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
5047 spin_unlock(&pers_lock);
5048 if (mddev->level != pers->level) {
5049 mddev->level = pers->level;
5050 mddev->new_level = pers->level;
5052 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
5054 if (mddev->reshape_position != MaxSector &&
5055 pers->start_reshape == NULL) {
5056 /* This personality cannot handle reshaping... */
5058 module_put(pers->owner);
5062 if (pers->sync_request) {
5063 /* Warn if this is a potentially silly
5066 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
5067 struct md_rdev *rdev2;
5070 rdev_for_each(rdev, mddev)
5071 rdev_for_each(rdev2, mddev) {
5073 rdev->bdev->bd_contains ==
5074 rdev2->bdev->bd_contains) {
5076 "%s: WARNING: %s appears to be"
5077 " on the same physical disk as"
5080 bdevname(rdev->bdev,b),
5081 bdevname(rdev2->bdev,b2));
5088 "True protection against single-disk"
5089 " failure might be compromised.\n");
5092 mddev->recovery = 0;
5093 /* may be over-ridden by personality */
5094 mddev->resync_max_sectors = mddev->dev_sectors;
5096 mddev->ok_start_degraded = start_dirty_degraded;
5098 if (start_readonly && mddev->ro == 0)
5099 mddev->ro = 2; /* read-only, but switch on first write */
5101 err = mddev->pers->run(mddev);
5103 printk(KERN_ERR "md: pers->run() failed ...\n");
5104 else if (mddev->pers->size(mddev, 0, 0) < mddev->array_sectors) {
5105 WARN_ONCE(!mddev->external_size, "%s: default size too small,"
5106 " but 'external_size' not in effect?\n", __func__);
5108 "md: invalid array_size %llu > default size %llu\n",
5109 (unsigned long long)mddev->array_sectors / 2,
5110 (unsigned long long)mddev->pers->size(mddev, 0, 0) / 2);
5112 mddev->pers->stop(mddev);
5114 if (err == 0 && mddev->pers->sync_request &&
5115 (mddev->bitmap_info.file || mddev->bitmap_info.offset)) {
5116 err = bitmap_create(mddev);
5118 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
5119 mdname(mddev), err);
5120 mddev->pers->stop(mddev);
5124 module_put(mddev->pers->owner);
5126 bitmap_destroy(mddev);
5129 if (mddev->pers->sync_request) {
5130 if (mddev->kobj.sd &&
5131 sysfs_create_group(&mddev->kobj, &md_redundancy_group))
5133 "md: cannot register extra attributes for %s\n",
5135 mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action");
5136 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
5139 atomic_set(&mddev->writes_pending,0);
5140 atomic_set(&mddev->max_corr_read_errors,
5141 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS);
5142 mddev->safemode = 0;
5143 mddev->safemode_timer.function = md_safemode_timeout;
5144 mddev->safemode_timer.data = (unsigned long) mddev;
5145 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
5149 rdev_for_each(rdev, mddev)
5150 if (rdev->raid_disk >= 0)
5151 if (sysfs_link_rdev(mddev, rdev))
5152 /* failure here is OK */;
5154 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5156 if (mddev->flags & MD_UPDATE_SB_FLAGS)
5157 md_update_sb(mddev, 0);
5159 md_new_event(mddev);
5160 sysfs_notify_dirent_safe(mddev->sysfs_state);
5161 sysfs_notify_dirent_safe(mddev->sysfs_action);
5162 sysfs_notify(&mddev->kobj, NULL, "degraded");
5165 EXPORT_SYMBOL_GPL(md_run);
5167 static int do_md_run(struct mddev *mddev)
5171 err = md_run(mddev);
5174 err = bitmap_load(mddev);
5176 bitmap_destroy(mddev);
5180 md_wakeup_thread(mddev->thread);
5181 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
5183 set_capacity(mddev->gendisk, mddev->array_sectors);
5184 revalidate_disk(mddev->gendisk);
5186 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
5191 static int restart_array(struct mddev *mddev)
5193 struct gendisk *disk = mddev->gendisk;
5195 /* Complain if it has no devices */
5196 if (list_empty(&mddev->disks))
5202 mddev->safemode = 0;
5204 set_disk_ro(disk, 0);
5205 printk(KERN_INFO "md: %s switched to read-write mode.\n",
5207 /* Kick recovery or resync if necessary */
5208 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5209 md_wakeup_thread(mddev->thread);
5210 md_wakeup_thread(mddev->sync_thread);
5211 sysfs_notify_dirent_safe(mddev->sysfs_state);
5215 /* similar to deny_write_access, but accounts for our holding a reference
5216 * to the file ourselves */
5217 static int deny_bitmap_write_access(struct file * file)
5219 struct inode *inode = file->f_mapping->host;
5221 spin_lock(&inode->i_lock);
5222 if (atomic_read(&inode->i_writecount) > 1) {
5223 spin_unlock(&inode->i_lock);
5226 atomic_set(&inode->i_writecount, -1);
5227 spin_unlock(&inode->i_lock);
5232 void restore_bitmap_write_access(struct file *file)
5234 struct inode *inode = file->f_mapping->host;
5236 spin_lock(&inode->i_lock);
5237 atomic_set(&inode->i_writecount, 1);
5238 spin_unlock(&inode->i_lock);
5241 static void md_clean(struct mddev *mddev)
5243 mddev->array_sectors = 0;
5244 mddev->external_size = 0;
5245 mddev->dev_sectors = 0;
5246 mddev->raid_disks = 0;
5247 mddev->recovery_cp = 0;
5248 mddev->resync_min = 0;
5249 mddev->resync_max = MaxSector;
5250 mddev->reshape_position = MaxSector;
5251 mddev->external = 0;
5252 mddev->persistent = 0;
5253 mddev->level = LEVEL_NONE;
5254 mddev->clevel[0] = 0;
5257 mddev->metadata_type[0] = 0;
5258 mddev->chunk_sectors = 0;
5259 mddev->ctime = mddev->utime = 0;
5261 mddev->max_disks = 0;
5263 mddev->can_decrease_events = 0;
5264 mddev->delta_disks = 0;
5265 mddev->reshape_backwards = 0;
5266 mddev->new_level = LEVEL_NONE;
5267 mddev->new_layout = 0;
5268 mddev->new_chunk_sectors = 0;
5269 mddev->curr_resync = 0;
5270 atomic64_set(&mddev->resync_mismatches, 0);
5271 mddev->suspend_lo = mddev->suspend_hi = 0;
5272 mddev->sync_speed_min = mddev->sync_speed_max = 0;
5273 mddev->recovery = 0;
5276 mddev->degraded = 0;
5277 mddev->safemode = 0;
5278 mddev->merge_check_needed = 0;
5279 mddev->bitmap_info.offset = 0;
5280 mddev->bitmap_info.default_offset = 0;
5281 mddev->bitmap_info.default_space = 0;
5282 mddev->bitmap_info.chunksize = 0;
5283 mddev->bitmap_info.daemon_sleep = 0;
5284 mddev->bitmap_info.max_write_behind = 0;
5287 static void __md_stop_writes(struct mddev *mddev)
5289 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5290 if (mddev->sync_thread) {
5291 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5292 md_reap_sync_thread(mddev);
5295 del_timer_sync(&mddev->safemode_timer);
5297 bitmap_flush(mddev);
5298 md_super_wait(mddev);
5300 if (mddev->ro == 0 &&
5301 (!mddev->in_sync || (mddev->flags & MD_UPDATE_SB_FLAGS))) {
5302 /* mark array as shutdown cleanly */
5304 md_update_sb(mddev, 1);
5308 void md_stop_writes(struct mddev *mddev)
5310 mddev_lock_nointr(mddev);
5311 __md_stop_writes(mddev);
5312 mddev_unlock(mddev);
5314 EXPORT_SYMBOL_GPL(md_stop_writes);
5316 static void __md_stop(struct mddev *mddev)
5319 mddev->pers->stop(mddev);
5320 if (mddev->pers->sync_request && mddev->to_remove == NULL)
5321 mddev->to_remove = &md_redundancy_group;
5322 module_put(mddev->pers->owner);
5324 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5327 void md_stop(struct mddev *mddev)
5329 /* stop the array and free an attached data structures.
5330 * This is called from dm-raid
5333 bitmap_destroy(mddev);
5335 bioset_free(mddev->bio_set);
5338 EXPORT_SYMBOL_GPL(md_stop);
5340 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev)
5345 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
5347 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5348 md_wakeup_thread(mddev->thread);
5350 if (mddev->sync_thread) {
5351 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5352 /* Thread might be blocked waiting for metadata update
5353 * which will now never happen */
5354 wake_up_process(mddev->sync_thread->tsk);
5356 mddev_unlock(mddev);
5357 wait_event(resync_wait, mddev->sync_thread == NULL);
5358 mddev_lock_nointr(mddev);
5360 mutex_lock(&mddev->open_mutex);
5361 if (atomic_read(&mddev->openers) > !!bdev ||
5362 mddev->sync_thread ||
5363 (bdev && !test_bit(MD_STILL_CLOSED, &mddev->flags))) {
5364 printk("md: %s still in use.\n",mdname(mddev));
5366 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5367 md_wakeup_thread(mddev->thread);
5373 __md_stop_writes(mddev);
5379 set_disk_ro(mddev->gendisk, 1);
5380 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5381 sysfs_notify_dirent_safe(mddev->sysfs_state);
5385 mutex_unlock(&mddev->open_mutex);
5390 * 0 - completely stop and dis-assemble array
5391 * 2 - stop but do not disassemble array
5393 static int do_md_stop(struct mddev * mddev, int mode,
5394 struct block_device *bdev)
5396 struct gendisk *disk = mddev->gendisk;
5397 struct md_rdev *rdev;
5400 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
5402 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5403 md_wakeup_thread(mddev->thread);
5405 if (mddev->sync_thread) {
5406 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5407 /* Thread might be blocked waiting for metadata update
5408 * which will now never happen */
5409 wake_up_process(mddev->sync_thread->tsk);
5411 mddev_unlock(mddev);
5412 wait_event(resync_wait, mddev->sync_thread == NULL);
5413 mddev_lock_nointr(mddev);
5415 mutex_lock(&mddev->open_mutex);
5416 if (atomic_read(&mddev->openers) > !!bdev ||
5417 mddev->sysfs_active ||
5418 mddev->sync_thread ||
5419 (bdev && !test_bit(MD_STILL_CLOSED, &mddev->flags))) {
5420 printk("md: %s still in use.\n",mdname(mddev));
5421 mutex_unlock(&mddev->open_mutex);
5423 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5424 md_wakeup_thread(mddev->thread);
5430 set_disk_ro(disk, 0);
5432 __md_stop_writes(mddev);
5434 mddev->queue->merge_bvec_fn = NULL;
5435 mddev->queue->backing_dev_info.congested_fn = NULL;
5437 /* tell userspace to handle 'inactive' */
5438 sysfs_notify_dirent_safe(mddev->sysfs_state);
5440 rdev_for_each(rdev, mddev)
5441 if (rdev->raid_disk >= 0)
5442 sysfs_unlink_rdev(mddev, rdev);
5444 set_capacity(disk, 0);
5445 mutex_unlock(&mddev->open_mutex);
5447 revalidate_disk(disk);
5452 mutex_unlock(&mddev->open_mutex);
5454 * Free resources if final stop
5457 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
5459 bitmap_destroy(mddev);
5460 if (mddev->bitmap_info.file) {
5461 restore_bitmap_write_access(mddev->bitmap_info.file);
5462 fput(mddev->bitmap_info.file);
5463 mddev->bitmap_info.file = NULL;
5465 mddev->bitmap_info.offset = 0;
5467 export_array(mddev);
5470 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
5471 if (mddev->hold_active == UNTIL_STOP)
5472 mddev->hold_active = 0;
5474 blk_integrity_unregister(disk);
5475 md_new_event(mddev);
5476 sysfs_notify_dirent_safe(mddev->sysfs_state);
5481 static void autorun_array(struct mddev *mddev)
5483 struct md_rdev *rdev;
5486 if (list_empty(&mddev->disks))
5489 printk(KERN_INFO "md: running: ");
5491 rdev_for_each(rdev, mddev) {
5492 char b[BDEVNAME_SIZE];
5493 printk("<%s>", bdevname(rdev->bdev,b));
5497 err = do_md_run(mddev);
5499 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
5500 do_md_stop(mddev, 0, NULL);
5505 * lets try to run arrays based on all disks that have arrived
5506 * until now. (those are in pending_raid_disks)
5508 * the method: pick the first pending disk, collect all disks with
5509 * the same UUID, remove all from the pending list and put them into
5510 * the 'same_array' list. Then order this list based on superblock
5511 * update time (freshest comes first), kick out 'old' disks and
5512 * compare superblocks. If everything's fine then run it.
5514 * If "unit" is allocated, then bump its reference count
5516 static void autorun_devices(int part)
5518 struct md_rdev *rdev0, *rdev, *tmp;
5519 struct mddev *mddev;
5520 char b[BDEVNAME_SIZE];
5522 printk(KERN_INFO "md: autorun ...\n");
5523 while (!list_empty(&pending_raid_disks)) {
5526 LIST_HEAD(candidates);
5527 rdev0 = list_entry(pending_raid_disks.next,
5528 struct md_rdev, same_set);
5530 printk(KERN_INFO "md: considering %s ...\n",
5531 bdevname(rdev0->bdev,b));
5532 INIT_LIST_HEAD(&candidates);
5533 rdev_for_each_list(rdev, tmp, &pending_raid_disks)
5534 if (super_90_load(rdev, rdev0, 0) >= 0) {
5535 printk(KERN_INFO "md: adding %s ...\n",
5536 bdevname(rdev->bdev,b));
5537 list_move(&rdev->same_set, &candidates);
5540 * now we have a set of devices, with all of them having
5541 * mostly sane superblocks. It's time to allocate the
5545 dev = MKDEV(mdp_major,
5546 rdev0->preferred_minor << MdpMinorShift);
5547 unit = MINOR(dev) >> MdpMinorShift;
5549 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
5552 if (rdev0->preferred_minor != unit) {
5553 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
5554 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
5558 md_probe(dev, NULL, NULL);
5559 mddev = mddev_find(dev);
5560 if (!mddev || !mddev->gendisk) {
5564 "md: cannot allocate memory for md drive.\n");
5567 if (mddev_lock(mddev))
5568 printk(KERN_WARNING "md: %s locked, cannot run\n",
5570 else if (mddev->raid_disks || mddev->major_version
5571 || !list_empty(&mddev->disks)) {
5573 "md: %s already running, cannot run %s\n",
5574 mdname(mddev), bdevname(rdev0->bdev,b));
5575 mddev_unlock(mddev);
5577 printk(KERN_INFO "md: created %s\n", mdname(mddev));
5578 mddev->persistent = 1;
5579 rdev_for_each_list(rdev, tmp, &candidates) {
5580 list_del_init(&rdev->same_set);
5581 if (bind_rdev_to_array(rdev, mddev))
5584 autorun_array(mddev);
5585 mddev_unlock(mddev);
5587 /* on success, candidates will be empty, on error
5590 rdev_for_each_list(rdev, tmp, &candidates) {
5591 list_del_init(&rdev->same_set);
5596 printk(KERN_INFO "md: ... autorun DONE.\n");
5598 #endif /* !MODULE */
5600 static int get_version(void __user * arg)
5604 ver.major = MD_MAJOR_VERSION;
5605 ver.minor = MD_MINOR_VERSION;
5606 ver.patchlevel = MD_PATCHLEVEL_VERSION;
5608 if (copy_to_user(arg, &ver, sizeof(ver)))
5614 static int get_array_info(struct mddev * mddev, void __user * arg)
5616 mdu_array_info_t info;
5617 int nr,working,insync,failed,spare;
5618 struct md_rdev *rdev;
5620 nr = working = insync = failed = spare = 0;
5622 rdev_for_each_rcu(rdev, mddev) {
5624 if (test_bit(Faulty, &rdev->flags))
5628 if (test_bit(In_sync, &rdev->flags))
5636 info.major_version = mddev->major_version;
5637 info.minor_version = mddev->minor_version;
5638 info.patch_version = MD_PATCHLEVEL_VERSION;
5639 info.ctime = mddev->ctime;
5640 info.level = mddev->level;
5641 info.size = mddev->dev_sectors / 2;
5642 if (info.size != mddev->dev_sectors / 2) /* overflow */
5645 info.raid_disks = mddev->raid_disks;
5646 info.md_minor = mddev->md_minor;
5647 info.not_persistent= !mddev->persistent;
5649 info.utime = mddev->utime;
5652 info.state = (1<<MD_SB_CLEAN);
5653 if (mddev->bitmap && mddev->bitmap_info.offset)
5654 info.state = (1<<MD_SB_BITMAP_PRESENT);
5655 info.active_disks = insync;
5656 info.working_disks = working;
5657 info.failed_disks = failed;
5658 info.spare_disks = spare;
5660 info.layout = mddev->layout;
5661 info.chunk_size = mddev->chunk_sectors << 9;
5663 if (copy_to_user(arg, &info, sizeof(info)))
5669 static int get_bitmap_file(struct mddev * mddev, void __user * arg)
5671 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
5672 char *ptr, *buf = NULL;
5675 file = kmalloc(sizeof(*file), GFP_NOIO);
5680 /* bitmap disabled, zero the first byte and copy out */
5681 if (!mddev->bitmap || !mddev->bitmap->storage.file) {
5682 file->pathname[0] = '\0';
5686 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
5690 ptr = d_path(&mddev->bitmap->storage.file->f_path,
5691 buf, sizeof(file->pathname));
5695 strcpy(file->pathname, ptr);
5699 if (copy_to_user(arg, file, sizeof(*file)))
5707 static int get_disk_info(struct mddev * mddev, void __user * arg)
5709 mdu_disk_info_t info;
5710 struct md_rdev *rdev;
5712 if (copy_from_user(&info, arg, sizeof(info)))
5716 rdev = find_rdev_nr_rcu(mddev, info.number);
5718 info.major = MAJOR(rdev->bdev->bd_dev);
5719 info.minor = MINOR(rdev->bdev->bd_dev);
5720 info.raid_disk = rdev->raid_disk;
5722 if (test_bit(Faulty, &rdev->flags))
5723 info.state |= (1<<MD_DISK_FAULTY);
5724 else if (test_bit(In_sync, &rdev->flags)) {
5725 info.state |= (1<<MD_DISK_ACTIVE);
5726 info.state |= (1<<MD_DISK_SYNC);
5728 if (test_bit(WriteMostly, &rdev->flags))
5729 info.state |= (1<<MD_DISK_WRITEMOSTLY);
5731 info.major = info.minor = 0;
5732 info.raid_disk = -1;
5733 info.state = (1<<MD_DISK_REMOVED);
5737 if (copy_to_user(arg, &info, sizeof(info)))
5743 static int add_new_disk(struct mddev * mddev, mdu_disk_info_t *info)
5745 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
5746 struct md_rdev *rdev;
5747 dev_t dev = MKDEV(info->major,info->minor);
5749 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
5752 if (!mddev->raid_disks) {
5754 /* expecting a device which has a superblock */
5755 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
5758 "md: md_import_device returned %ld\n",
5760 return PTR_ERR(rdev);
5762 if (!list_empty(&mddev->disks)) {
5763 struct md_rdev *rdev0
5764 = list_entry(mddev->disks.next,
5765 struct md_rdev, same_set);
5766 err = super_types[mddev->major_version]
5767 .load_super(rdev, rdev0, mddev->minor_version);
5770 "md: %s has different UUID to %s\n",
5771 bdevname(rdev->bdev,b),
5772 bdevname(rdev0->bdev,b2));
5777 err = bind_rdev_to_array(rdev, mddev);
5784 * add_new_disk can be used once the array is assembled
5785 * to add "hot spares". They must already have a superblock
5790 if (!mddev->pers->hot_add_disk) {
5792 "%s: personality does not support diskops!\n",
5796 if (mddev->persistent)
5797 rdev = md_import_device(dev, mddev->major_version,
5798 mddev->minor_version);
5800 rdev = md_import_device(dev, -1, -1);
5803 "md: md_import_device returned %ld\n",
5805 return PTR_ERR(rdev);
5807 /* set saved_raid_disk if appropriate */
5808 if (!mddev->persistent) {
5809 if (info->state & (1<<MD_DISK_SYNC) &&
5810 info->raid_disk < mddev->raid_disks) {
5811 rdev->raid_disk = info->raid_disk;
5812 set_bit(In_sync, &rdev->flags);
5814 rdev->raid_disk = -1;
5816 super_types[mddev->major_version].
5817 validate_super(mddev, rdev);
5818 if ((info->state & (1<<MD_DISK_SYNC)) &&
5819 rdev->raid_disk != info->raid_disk) {
5820 /* This was a hot-add request, but events doesn't
5821 * match, so reject it.
5827 if (test_bit(In_sync, &rdev->flags))
5828 rdev->saved_raid_disk = rdev->raid_disk;
5830 rdev->saved_raid_disk = -1;
5832 clear_bit(In_sync, &rdev->flags); /* just to be sure */
5833 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
5834 set_bit(WriteMostly, &rdev->flags);
5836 clear_bit(WriteMostly, &rdev->flags);
5838 rdev->raid_disk = -1;
5839 err = bind_rdev_to_array(rdev, mddev);
5840 if (!err && !mddev->pers->hot_remove_disk) {
5841 /* If there is hot_add_disk but no hot_remove_disk
5842 * then added disks for geometry changes,
5843 * and should be added immediately.
5845 super_types[mddev->major_version].
5846 validate_super(mddev, rdev);
5847 err = mddev->pers->hot_add_disk(mddev, rdev);
5849 unbind_rdev_from_array(rdev);
5854 sysfs_notify_dirent_safe(rdev->sysfs_state);
5856 set_bit(MD_CHANGE_DEVS, &mddev->flags);
5857 if (mddev->degraded)
5858 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
5859 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5861 md_new_event(mddev);
5862 md_wakeup_thread(mddev->thread);
5866 /* otherwise, add_new_disk is only allowed
5867 * for major_version==0 superblocks
5869 if (mddev->major_version != 0) {
5870 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
5875 if (!(info->state & (1<<MD_DISK_FAULTY))) {
5877 rdev = md_import_device(dev, -1, 0);
5880 "md: error, md_import_device() returned %ld\n",
5882 return PTR_ERR(rdev);
5884 rdev->desc_nr = info->number;
5885 if (info->raid_disk < mddev->raid_disks)
5886 rdev->raid_disk = info->raid_disk;
5888 rdev->raid_disk = -1;
5890 if (rdev->raid_disk < mddev->raid_disks)
5891 if (info->state & (1<<MD_DISK_SYNC))
5892 set_bit(In_sync, &rdev->flags);
5894 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
5895 set_bit(WriteMostly, &rdev->flags);
5897 if (!mddev->persistent) {
5898 printk(KERN_INFO "md: nonpersistent superblock ...\n");
5899 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
5901 rdev->sb_start = calc_dev_sboffset(rdev);
5902 rdev->sectors = rdev->sb_start;
5904 err = bind_rdev_to_array(rdev, mddev);
5914 static int hot_remove_disk(struct mddev * mddev, dev_t dev)
5916 char b[BDEVNAME_SIZE];
5917 struct md_rdev *rdev;
5919 rdev = find_rdev(mddev, dev);
5923 clear_bit(Blocked, &rdev->flags);
5924 remove_and_add_spares(mddev, rdev);
5926 if (rdev->raid_disk >= 0)
5929 kick_rdev_from_array(rdev);
5930 md_update_sb(mddev, 1);
5931 md_new_event(mddev);
5935 printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n",
5936 bdevname(rdev->bdev,b), mdname(mddev));
5940 static int hot_add_disk(struct mddev * mddev, dev_t dev)
5942 char b[BDEVNAME_SIZE];
5944 struct md_rdev *rdev;
5949 if (mddev->major_version != 0) {
5950 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
5951 " version-0 superblocks.\n",
5955 if (!mddev->pers->hot_add_disk) {
5957 "%s: personality does not support diskops!\n",
5962 rdev = md_import_device(dev, -1, 0);
5965 "md: error, md_import_device() returned %ld\n",
5970 if (mddev->persistent)
5971 rdev->sb_start = calc_dev_sboffset(rdev);
5973 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
5975 rdev->sectors = rdev->sb_start;
5977 if (test_bit(Faulty, &rdev->flags)) {
5979 "md: can not hot-add faulty %s disk to %s!\n",
5980 bdevname(rdev->bdev,b), mdname(mddev));
5984 clear_bit(In_sync, &rdev->flags);
5986 rdev->saved_raid_disk = -1;
5987 err = bind_rdev_to_array(rdev, mddev);
5992 * The rest should better be atomic, we can have disk failures
5993 * noticed in interrupt contexts ...
5996 rdev->raid_disk = -1;
5998 md_update_sb(mddev, 1);
6001 * Kick recovery, maybe this spare has to be added to the
6002 * array immediately.
6004 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6005 md_wakeup_thread(mddev->thread);
6006 md_new_event(mddev);
6014 static int set_bitmap_file(struct mddev *mddev, int fd)
6019 if (!mddev->pers->quiesce)
6021 if (mddev->recovery || mddev->sync_thread)
6023 /* we should be able to change the bitmap.. */
6029 return -EEXIST; /* cannot add when bitmap is present */
6030 mddev->bitmap_info.file = fget(fd);
6032 if (mddev->bitmap_info.file == NULL) {
6033 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
6038 err = deny_bitmap_write_access(mddev->bitmap_info.file);
6040 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
6042 fput(mddev->bitmap_info.file);
6043 mddev->bitmap_info.file = NULL;
6046 mddev->bitmap_info.offset = 0; /* file overrides offset */
6047 } else if (mddev->bitmap == NULL)
6048 return -ENOENT; /* cannot remove what isn't there */
6051 mddev->pers->quiesce(mddev, 1);
6053 err = bitmap_create(mddev);
6055 err = bitmap_load(mddev);
6057 if (fd < 0 || err) {
6058 bitmap_destroy(mddev);
6059 fd = -1; /* make sure to put the file */
6061 mddev->pers->quiesce(mddev, 0);
6064 if (mddev->bitmap_info.file) {
6065 restore_bitmap_write_access(mddev->bitmap_info.file);
6066 fput(mddev->bitmap_info.file);
6068 mddev->bitmap_info.file = NULL;
6075 * set_array_info is used two different ways
6076 * The original usage is when creating a new array.
6077 * In this usage, raid_disks is > 0 and it together with
6078 * level, size, not_persistent,layout,chunksize determine the
6079 * shape of the array.
6080 * This will always create an array with a type-0.90.0 superblock.
6081 * The newer usage is when assembling an array.
6082 * In this case raid_disks will be 0, and the major_version field is
6083 * use to determine which style super-blocks are to be found on the devices.
6084 * The minor and patch _version numbers are also kept incase the
6085 * super_block handler wishes to interpret them.
6087 static int set_array_info(struct mddev * mddev, mdu_array_info_t *info)
6090 if (info->raid_disks == 0) {
6091 /* just setting version number for superblock loading */
6092 if (info->major_version < 0 ||
6093 info->major_version >= ARRAY_SIZE(super_types) ||
6094 super_types[info->major_version].name == NULL) {
6095 /* maybe try to auto-load a module? */
6097 "md: superblock version %d not known\n",
6098 info->major_version);
6101 mddev->major_version = info->major_version;
6102 mddev->minor_version = info->minor_version;
6103 mddev->patch_version = info->patch_version;
6104 mddev->persistent = !info->not_persistent;
6105 /* ensure mddev_put doesn't delete this now that there
6106 * is some minimal configuration.
6108 mddev->ctime = get_seconds();
6111 mddev->major_version = MD_MAJOR_VERSION;
6112 mddev->minor_version = MD_MINOR_VERSION;
6113 mddev->patch_version = MD_PATCHLEVEL_VERSION;
6114 mddev->ctime = get_seconds();
6116 mddev->level = info->level;
6117 mddev->clevel[0] = 0;
6118 mddev->dev_sectors = 2 * (sector_t)info->size;
6119 mddev->raid_disks = info->raid_disks;
6120 /* don't set md_minor, it is determined by which /dev/md* was
6123 if (info->state & (1<<MD_SB_CLEAN))
6124 mddev->recovery_cp = MaxSector;
6126 mddev->recovery_cp = 0;
6127 mddev->persistent = ! info->not_persistent;
6128 mddev->external = 0;
6130 mddev->layout = info->layout;
6131 mddev->chunk_sectors = info->chunk_size >> 9;
6133 mddev->max_disks = MD_SB_DISKS;
6135 if (mddev->persistent)
6137 set_bit(MD_CHANGE_DEVS, &mddev->flags);
6139 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
6140 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
6141 mddev->bitmap_info.offset = 0;
6143 mddev->reshape_position = MaxSector;
6146 * Generate a 128 bit UUID
6148 get_random_bytes(mddev->uuid, 16);
6150 mddev->new_level = mddev->level;
6151 mddev->new_chunk_sectors = mddev->chunk_sectors;
6152 mddev->new_layout = mddev->layout;
6153 mddev->delta_disks = 0;
6154 mddev->reshape_backwards = 0;
6159 void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors)
6161 WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__);
6163 if (mddev->external_size)
6166 mddev->array_sectors = array_sectors;
6168 EXPORT_SYMBOL(md_set_array_sectors);
6170 static int update_size(struct mddev *mddev, sector_t num_sectors)
6172 struct md_rdev *rdev;
6174 int fit = (num_sectors == 0);
6176 if (mddev->pers->resize == NULL)
6178 /* The "num_sectors" is the number of sectors of each device that
6179 * is used. This can only make sense for arrays with redundancy.
6180 * linear and raid0 always use whatever space is available. We can only
6181 * consider changing this number if no resync or reconstruction is
6182 * happening, and if the new size is acceptable. It must fit before the
6183 * sb_start or, if that is <data_offset, it must fit before the size
6184 * of each device. If num_sectors is zero, we find the largest size
6187 if (mddev->sync_thread)
6190 rdev_for_each(rdev, mddev) {
6191 sector_t avail = rdev->sectors;
6193 if (fit && (num_sectors == 0 || num_sectors > avail))
6194 num_sectors = avail;
6195 if (avail < num_sectors)
6198 rv = mddev->pers->resize(mddev, num_sectors);
6200 revalidate_disk(mddev->gendisk);
6204 static int update_raid_disks(struct mddev *mddev, int raid_disks)
6207 struct md_rdev *rdev;
6208 /* change the number of raid disks */
6209 if (mddev->pers->check_reshape == NULL)
6211 if (raid_disks <= 0 ||
6212 (mddev->max_disks && raid_disks >= mddev->max_disks))
6214 if (mddev->sync_thread || mddev->reshape_position != MaxSector)
6217 rdev_for_each(rdev, mddev) {
6218 if (mddev->raid_disks < raid_disks &&
6219 rdev->data_offset < rdev->new_data_offset)
6221 if (mddev->raid_disks > raid_disks &&
6222 rdev->data_offset > rdev->new_data_offset)
6226 mddev->delta_disks = raid_disks - mddev->raid_disks;
6227 if (mddev->delta_disks < 0)
6228 mddev->reshape_backwards = 1;
6229 else if (mddev->delta_disks > 0)
6230 mddev->reshape_backwards = 0;
6232 rv = mddev->pers->check_reshape(mddev);
6234 mddev->delta_disks = 0;
6235 mddev->reshape_backwards = 0;
6242 * update_array_info is used to change the configuration of an
6244 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
6245 * fields in the info are checked against the array.
6246 * Any differences that cannot be handled will cause an error.
6247 * Normally, only one change can be managed at a time.
6249 static int update_array_info(struct mddev *mddev, mdu_array_info_t *info)
6255 /* calculate expected state,ignoring low bits */
6256 if (mddev->bitmap && mddev->bitmap_info.offset)
6257 state |= (1 << MD_SB_BITMAP_PRESENT);
6259 if (mddev->major_version != info->major_version ||
6260 mddev->minor_version != info->minor_version ||
6261 /* mddev->patch_version != info->patch_version || */
6262 mddev->ctime != info->ctime ||
6263 mddev->level != info->level ||
6264 /* mddev->layout != info->layout || */
6265 !mddev->persistent != info->not_persistent||
6266 mddev->chunk_sectors != info->chunk_size >> 9 ||
6267 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
6268 ((state^info->state) & 0xfffffe00)
6271 /* Check there is only one change */
6272 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
6274 if (mddev->raid_disks != info->raid_disks)
6276 if (mddev->layout != info->layout)
6278 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT))
6285 if (mddev->layout != info->layout) {
6287 * we don't need to do anything at the md level, the
6288 * personality will take care of it all.
6290 if (mddev->pers->check_reshape == NULL)
6293 mddev->new_layout = info->layout;
6294 rv = mddev->pers->check_reshape(mddev);
6296 mddev->new_layout = mddev->layout;
6300 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
6301 rv = update_size(mddev, (sector_t)info->size * 2);
6303 if (mddev->raid_disks != info->raid_disks)
6304 rv = update_raid_disks(mddev, info->raid_disks);
6306 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
6307 if (mddev->pers->quiesce == NULL)
6309 if (mddev->recovery || mddev->sync_thread)
6311 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
6312 /* add the bitmap */
6315 if (mddev->bitmap_info.default_offset == 0)
6317 mddev->bitmap_info.offset =
6318 mddev->bitmap_info.default_offset;
6319 mddev->bitmap_info.space =
6320 mddev->bitmap_info.default_space;
6321 mddev->pers->quiesce(mddev, 1);
6322 rv = bitmap_create(mddev);
6324 rv = bitmap_load(mddev);
6326 bitmap_destroy(mddev);
6327 mddev->pers->quiesce(mddev, 0);
6329 /* remove the bitmap */
6332 if (mddev->bitmap->storage.file)
6334 mddev->pers->quiesce(mddev, 1);
6335 bitmap_destroy(mddev);
6336 mddev->pers->quiesce(mddev, 0);
6337 mddev->bitmap_info.offset = 0;
6340 md_update_sb(mddev, 1);
6344 static int set_disk_faulty(struct mddev *mddev, dev_t dev)
6346 struct md_rdev *rdev;
6349 if (mddev->pers == NULL)
6353 rdev = find_rdev_rcu(mddev, dev);
6357 md_error(mddev, rdev);
6358 if (!test_bit(Faulty, &rdev->flags))
6366 * We have a problem here : there is no easy way to give a CHS
6367 * virtual geometry. We currently pretend that we have a 2 heads
6368 * 4 sectors (with a BIG number of cylinders...). This drives
6369 * dosfs just mad... ;-)
6371 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
6373 struct mddev *mddev = bdev->bd_disk->private_data;
6377 geo->cylinders = mddev->array_sectors / 8;
6381 static int md_ioctl(struct block_device *bdev, fmode_t mode,
6382 unsigned int cmd, unsigned long arg)
6385 void __user *argp = (void __user *)arg;
6386 struct mddev *mddev = NULL;
6391 case GET_ARRAY_INFO:
6395 if (!capable(CAP_SYS_ADMIN))
6400 * Commands dealing with the RAID driver but not any
6405 err = get_version(argp);
6408 case PRINT_RAID_DEBUG:
6416 autostart_arrays(arg);
6423 * Commands creating/starting a new array:
6426 mddev = bdev->bd_disk->private_data;
6433 /* Some actions do not requires the mutex */
6435 case GET_ARRAY_INFO:
6436 if (!mddev->raid_disks && !mddev->external)
6439 err = get_array_info(mddev, argp);
6443 if (!mddev->raid_disks && !mddev->external)
6446 err = get_disk_info(mddev, argp);
6449 case SET_DISK_FAULTY:
6450 err = set_disk_faulty(mddev, new_decode_dev(arg));
6454 if (cmd == ADD_NEW_DISK)
6455 /* need to ensure md_delayed_delete() has completed */
6456 flush_workqueue(md_misc_wq);
6458 if (cmd == HOT_REMOVE_DISK)
6459 /* need to ensure recovery thread has run */
6460 wait_event_interruptible_timeout(mddev->sb_wait,
6461 !test_bit(MD_RECOVERY_NEEDED,
6463 msecs_to_jiffies(5000));
6464 if (cmd == STOP_ARRAY || cmd == STOP_ARRAY_RO) {
6465 /* Need to flush page cache, and ensure no-one else opens
6468 mutex_lock(&mddev->open_mutex);
6469 if (atomic_read(&mddev->openers) > 1) {
6470 mutex_unlock(&mddev->open_mutex);
6474 set_bit(MD_STILL_CLOSED, &mddev->flags);
6475 mutex_unlock(&mddev->open_mutex);
6476 sync_blockdev(bdev);
6478 err = mddev_lock(mddev);
6481 "md: ioctl lock interrupted, reason %d, cmd %d\n",
6486 if (cmd == SET_ARRAY_INFO) {
6487 mdu_array_info_t info;
6489 memset(&info, 0, sizeof(info));
6490 else if (copy_from_user(&info, argp, sizeof(info))) {
6495 err = update_array_info(mddev, &info);
6497 printk(KERN_WARNING "md: couldn't update"
6498 " array info. %d\n", err);
6503 if (!list_empty(&mddev->disks)) {
6505 "md: array %s already has disks!\n",
6510 if (mddev->raid_disks) {
6512 "md: array %s already initialised!\n",
6517 err = set_array_info(mddev, &info);
6519 printk(KERN_WARNING "md: couldn't set"
6520 " array info. %d\n", err);
6527 * Commands querying/configuring an existing array:
6529 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
6530 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
6531 if ((!mddev->raid_disks && !mddev->external)
6532 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
6533 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
6534 && cmd != GET_BITMAP_FILE) {
6540 * Commands even a read-only array can execute:
6543 case GET_BITMAP_FILE:
6544 err = get_bitmap_file(mddev, argp);
6547 case RESTART_ARRAY_RW:
6548 err = restart_array(mddev);
6552 err = do_md_stop(mddev, 0, bdev);
6556 err = md_set_readonly(mddev, bdev);
6559 case HOT_REMOVE_DISK:
6560 err = hot_remove_disk(mddev, new_decode_dev(arg));
6564 /* We can support ADD_NEW_DISK on read-only arrays
6565 * on if we are re-adding a preexisting device.
6566 * So require mddev->pers and MD_DISK_SYNC.
6569 mdu_disk_info_t info;
6570 if (copy_from_user(&info, argp, sizeof(info)))
6572 else if (!(info.state & (1<<MD_DISK_SYNC)))
6573 /* Need to clear read-only for this */
6576 err = add_new_disk(mddev, &info);
6582 if (get_user(ro, (int __user *)(arg))) {
6588 /* if the bdev is going readonly the value of mddev->ro
6589 * does not matter, no writes are coming
6594 /* are we are already prepared for writes? */
6598 /* transitioning to readauto need only happen for
6599 * arrays that call md_write_start
6602 err = restart_array(mddev);
6605 set_disk_ro(mddev->gendisk, 0);
6612 * The remaining ioctls are changing the state of the
6613 * superblock, so we do not allow them on read-only arrays.
6614 * However non-MD ioctls (e.g. get-size) will still come through
6615 * here and hit the 'default' below, so only disallow
6616 * 'md' ioctls, and switch to rw mode if started auto-readonly.
6618 if (_IOC_TYPE(cmd) == MD_MAJOR && mddev->ro && mddev->pers) {
6619 if (mddev->ro == 2) {
6621 sysfs_notify_dirent_safe(mddev->sysfs_state);
6622 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6623 /* mddev_unlock will wake thread */
6624 /* If a device failed while we were read-only, we
6625 * need to make sure the metadata is updated now.
6627 if (test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
6628 mddev_unlock(mddev);
6629 wait_event(mddev->sb_wait,
6630 !test_bit(MD_CHANGE_DEVS, &mddev->flags) &&
6631 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
6632 mddev_lock_nointr(mddev);
6643 mdu_disk_info_t info;
6644 if (copy_from_user(&info, argp, sizeof(info)))
6647 err = add_new_disk(mddev, &info);
6652 err = hot_add_disk(mddev, new_decode_dev(arg));
6656 err = do_md_run(mddev);
6659 case SET_BITMAP_FILE:
6660 err = set_bitmap_file(mddev, (int)arg);
6670 if (mddev->hold_active == UNTIL_IOCTL &&
6672 mddev->hold_active = 0;
6673 mddev_unlock(mddev);
6682 #ifdef CONFIG_COMPAT
6683 static int md_compat_ioctl(struct block_device *bdev, fmode_t mode,
6684 unsigned int cmd, unsigned long arg)
6687 case HOT_REMOVE_DISK:
6689 case SET_DISK_FAULTY:
6690 case SET_BITMAP_FILE:
6691 /* These take in integer arg, do not convert */
6694 arg = (unsigned long)compat_ptr(arg);
6698 return md_ioctl(bdev, mode, cmd, arg);
6700 #endif /* CONFIG_COMPAT */
6702 static int md_open(struct block_device *bdev, fmode_t mode)
6705 * Succeed if we can lock the mddev, which confirms that
6706 * it isn't being stopped right now.
6708 struct mddev *mddev = mddev_find(bdev->bd_dev);
6714 if (mddev->gendisk != bdev->bd_disk) {
6715 /* we are racing with mddev_put which is discarding this
6719 /* Wait until bdev->bd_disk is definitely gone */
6720 flush_workqueue(md_misc_wq);
6721 /* Then retry the open from the top */
6722 return -ERESTARTSYS;
6724 BUG_ON(mddev != bdev->bd_disk->private_data);
6726 if ((err = mutex_lock_interruptible(&mddev->open_mutex)))
6730 atomic_inc(&mddev->openers);
6731 clear_bit(MD_STILL_CLOSED, &mddev->flags);
6732 mutex_unlock(&mddev->open_mutex);
6734 check_disk_change(bdev);
6739 static void md_release(struct gendisk *disk, fmode_t mode)
6741 struct mddev *mddev = disk->private_data;
6744 atomic_dec(&mddev->openers);
6748 static int md_media_changed(struct gendisk *disk)
6750 struct mddev *mddev = disk->private_data;
6752 return mddev->changed;
6755 static int md_revalidate(struct gendisk *disk)
6757 struct mddev *mddev = disk->private_data;
6762 static const struct block_device_operations md_fops =
6764 .owner = THIS_MODULE,
6766 .release = md_release,
6768 #ifdef CONFIG_COMPAT
6769 .compat_ioctl = md_compat_ioctl,
6771 .getgeo = md_getgeo,
6772 .media_changed = md_media_changed,
6773 .revalidate_disk= md_revalidate,
6776 static int md_thread(void * arg)
6778 struct md_thread *thread = arg;
6781 * md_thread is a 'system-thread', it's priority should be very
6782 * high. We avoid resource deadlocks individually in each
6783 * raid personality. (RAID5 does preallocation) We also use RR and
6784 * the very same RT priority as kswapd, thus we will never get
6785 * into a priority inversion deadlock.
6787 * we definitely have to have equal or higher priority than
6788 * bdflush, otherwise bdflush will deadlock if there are too
6789 * many dirty RAID5 blocks.
6792 allow_signal(SIGKILL);
6793 while (!kthread_should_stop()) {
6795 /* We need to wait INTERRUPTIBLE so that
6796 * we don't add to the load-average.
6797 * That means we need to be sure no signals are
6800 if (signal_pending(current))
6801 flush_signals(current);
6803 wait_event_interruptible_timeout
6805 test_bit(THREAD_WAKEUP, &thread->flags)
6806 || kthread_should_stop(),
6809 clear_bit(THREAD_WAKEUP, &thread->flags);
6810 if (!kthread_should_stop())
6811 thread->run(thread);
6817 void md_wakeup_thread(struct md_thread *thread)
6820 pr_debug("md: waking up MD thread %s.\n", thread->tsk->comm);
6821 set_bit(THREAD_WAKEUP, &thread->flags);
6822 wake_up(&thread->wqueue);
6826 struct md_thread *md_register_thread(void (*run) (struct md_thread *),
6827 struct mddev *mddev, const char *name)
6829 struct md_thread *thread;
6831 thread = kzalloc(sizeof(struct md_thread), GFP_KERNEL);
6835 init_waitqueue_head(&thread->wqueue);
6838 thread->mddev = mddev;
6839 thread->timeout = MAX_SCHEDULE_TIMEOUT;
6840 thread->tsk = kthread_run(md_thread, thread,
6842 mdname(thread->mddev),
6844 if (IS_ERR(thread->tsk)) {
6851 void md_unregister_thread(struct md_thread **threadp)
6853 struct md_thread *thread = *threadp;
6856 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
6857 /* Locking ensures that mddev_unlock does not wake_up a
6858 * non-existent thread
6860 spin_lock(&pers_lock);
6862 spin_unlock(&pers_lock);
6864 kthread_stop(thread->tsk);
6868 void md_error(struct mddev *mddev, struct md_rdev *rdev)
6875 if (!rdev || test_bit(Faulty, &rdev->flags))
6878 if (!mddev->pers || !mddev->pers->error_handler)
6880 mddev->pers->error_handler(mddev,rdev);
6881 if (mddev->degraded)
6882 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6883 sysfs_notify_dirent_safe(rdev->sysfs_state);
6884 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6885 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6886 md_wakeup_thread(mddev->thread);
6887 if (mddev->event_work.func)
6888 queue_work(md_misc_wq, &mddev->event_work);
6889 md_new_event_inintr(mddev);
6892 /* seq_file implementation /proc/mdstat */
6894 static void status_unused(struct seq_file *seq)
6897 struct md_rdev *rdev;
6899 seq_printf(seq, "unused devices: ");
6901 list_for_each_entry(rdev, &pending_raid_disks, same_set) {
6902 char b[BDEVNAME_SIZE];
6904 seq_printf(seq, "%s ",
6905 bdevname(rdev->bdev,b));
6908 seq_printf(seq, "<none>");
6910 seq_printf(seq, "\n");
6914 static void status_resync(struct seq_file *seq, struct mddev * mddev)
6916 sector_t max_sectors, resync, res;
6917 unsigned long dt, db;
6920 unsigned int per_milli;
6922 if (mddev->curr_resync <= 3)
6925 resync = mddev->curr_resync
6926 - atomic_read(&mddev->recovery_active);
6928 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
6929 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
6930 max_sectors = mddev->resync_max_sectors;
6932 max_sectors = mddev->dev_sectors;
6935 * Should not happen.
6941 /* Pick 'scale' such that (resync>>scale)*1000 will fit
6942 * in a sector_t, and (max_sectors>>scale) will fit in a
6943 * u32, as those are the requirements for sector_div.
6944 * Thus 'scale' must be at least 10
6947 if (sizeof(sector_t) > sizeof(unsigned long)) {
6948 while ( max_sectors/2 > (1ULL<<(scale+32)))
6951 res = (resync>>scale)*1000;
6952 sector_div(res, (u32)((max_sectors>>scale)+1));
6956 int i, x = per_milli/50, y = 20-x;
6957 seq_printf(seq, "[");
6958 for (i = 0; i < x; i++)
6959 seq_printf(seq, "=");
6960 seq_printf(seq, ">");
6961 for (i = 0; i < y; i++)
6962 seq_printf(seq, ".");
6963 seq_printf(seq, "] ");
6965 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
6966 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
6968 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
6970 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
6971 "resync" : "recovery"))),
6972 per_milli/10, per_milli % 10,
6973 (unsigned long long) resync/2,
6974 (unsigned long long) max_sectors/2);
6977 * dt: time from mark until now
6978 * db: blocks written from mark until now
6979 * rt: remaining time
6981 * rt is a sector_t, so could be 32bit or 64bit.
6982 * So we divide before multiply in case it is 32bit and close
6984 * We scale the divisor (db) by 32 to avoid losing precision
6985 * near the end of resync when the number of remaining sectors
6987 * We then divide rt by 32 after multiplying by db to compensate.
6988 * The '+1' avoids division by zero if db is very small.
6990 dt = ((jiffies - mddev->resync_mark) / HZ);
6992 db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active))
6993 - mddev->resync_mark_cnt;
6995 rt = max_sectors - resync; /* number of remaining sectors */
6996 sector_div(rt, db/32+1);
7000 seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60,
7001 ((unsigned long)rt % 60)/6);
7003 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
7006 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
7008 struct list_head *tmp;
7010 struct mddev *mddev;
7018 spin_lock(&all_mddevs_lock);
7019 list_for_each(tmp,&all_mddevs)
7021 mddev = list_entry(tmp, struct mddev, all_mddevs);
7023 spin_unlock(&all_mddevs_lock);
7026 spin_unlock(&all_mddevs_lock);
7028 return (void*)2;/* tail */
7032 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
7034 struct list_head *tmp;
7035 struct mddev *next_mddev, *mddev = v;
7041 spin_lock(&all_mddevs_lock);
7043 tmp = all_mddevs.next;
7045 tmp = mddev->all_mddevs.next;
7046 if (tmp != &all_mddevs)
7047 next_mddev = mddev_get(list_entry(tmp,struct mddev,all_mddevs));
7049 next_mddev = (void*)2;
7052 spin_unlock(&all_mddevs_lock);
7060 static void md_seq_stop(struct seq_file *seq, void *v)
7062 struct mddev *mddev = v;
7064 if (mddev && v != (void*)1 && v != (void*)2)
7068 static int md_seq_show(struct seq_file *seq, void *v)
7070 struct mddev *mddev = v;
7072 struct md_rdev *rdev;
7074 if (v == (void*)1) {
7075 struct md_personality *pers;
7076 seq_printf(seq, "Personalities : ");
7077 spin_lock(&pers_lock);
7078 list_for_each_entry(pers, &pers_list, list)
7079 seq_printf(seq, "[%s] ", pers->name);
7081 spin_unlock(&pers_lock);
7082 seq_printf(seq, "\n");
7083 seq->poll_event = atomic_read(&md_event_count);
7086 if (v == (void*)2) {
7091 if (mddev_lock(mddev) < 0)
7094 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
7095 seq_printf(seq, "%s : %sactive", mdname(mddev),
7096 mddev->pers ? "" : "in");
7099 seq_printf(seq, " (read-only)");
7101 seq_printf(seq, " (auto-read-only)");
7102 seq_printf(seq, " %s", mddev->pers->name);
7106 rdev_for_each(rdev, mddev) {
7107 char b[BDEVNAME_SIZE];
7108 seq_printf(seq, " %s[%d]",
7109 bdevname(rdev->bdev,b), rdev->desc_nr);
7110 if (test_bit(WriteMostly, &rdev->flags))
7111 seq_printf(seq, "(W)");
7112 if (test_bit(Faulty, &rdev->flags)) {
7113 seq_printf(seq, "(F)");
7116 if (rdev->raid_disk < 0)
7117 seq_printf(seq, "(S)"); /* spare */
7118 if (test_bit(Replacement, &rdev->flags))
7119 seq_printf(seq, "(R)");
7120 sectors += rdev->sectors;
7123 if (!list_empty(&mddev->disks)) {
7125 seq_printf(seq, "\n %llu blocks",
7126 (unsigned long long)
7127 mddev->array_sectors / 2);
7129 seq_printf(seq, "\n %llu blocks",
7130 (unsigned long long)sectors / 2);
7132 if (mddev->persistent) {
7133 if (mddev->major_version != 0 ||
7134 mddev->minor_version != 90) {
7135 seq_printf(seq," super %d.%d",
7136 mddev->major_version,
7137 mddev->minor_version);
7139 } else if (mddev->external)
7140 seq_printf(seq, " super external:%s",
7141 mddev->metadata_type);
7143 seq_printf(seq, " super non-persistent");
7146 mddev->pers->status(seq, mddev);
7147 seq_printf(seq, "\n ");
7148 if (mddev->pers->sync_request) {
7149 if (mddev->curr_resync > 2) {
7150 status_resync(seq, mddev);
7151 seq_printf(seq, "\n ");
7152 } else if (mddev->curr_resync >= 1)
7153 seq_printf(seq, "\tresync=DELAYED\n ");
7154 else if (mddev->recovery_cp < MaxSector)
7155 seq_printf(seq, "\tresync=PENDING\n ");
7158 seq_printf(seq, "\n ");
7160 bitmap_status(seq, mddev->bitmap);
7162 seq_printf(seq, "\n");
7164 mddev_unlock(mddev);
7169 static const struct seq_operations md_seq_ops = {
7170 .start = md_seq_start,
7171 .next = md_seq_next,
7172 .stop = md_seq_stop,
7173 .show = md_seq_show,
7176 static int md_seq_open(struct inode *inode, struct file *file)
7178 struct seq_file *seq;
7181 error = seq_open(file, &md_seq_ops);
7185 seq = file->private_data;
7186 seq->poll_event = atomic_read(&md_event_count);
7190 static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
7192 struct seq_file *seq = filp->private_data;
7195 poll_wait(filp, &md_event_waiters, wait);
7197 /* always allow read */
7198 mask = POLLIN | POLLRDNORM;
7200 if (seq->poll_event != atomic_read(&md_event_count))
7201 mask |= POLLERR | POLLPRI;
7205 static const struct file_operations md_seq_fops = {
7206 .owner = THIS_MODULE,
7207 .open = md_seq_open,
7209 .llseek = seq_lseek,
7210 .release = seq_release_private,
7211 .poll = mdstat_poll,
7214 int register_md_personality(struct md_personality *p)
7216 spin_lock(&pers_lock);
7217 list_add_tail(&p->list, &pers_list);
7218 printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level);
7219 spin_unlock(&pers_lock);
7223 int unregister_md_personality(struct md_personality *p)
7225 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
7226 spin_lock(&pers_lock);
7227 list_del_init(&p->list);
7228 spin_unlock(&pers_lock);
7232 static int is_mddev_idle(struct mddev *mddev, int init)
7234 struct md_rdev * rdev;
7240 rdev_for_each_rcu(rdev, mddev) {
7241 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
7242 curr_events = (int)part_stat_read(&disk->part0, sectors[0]) +
7243 (int)part_stat_read(&disk->part0, sectors[1]) -
7244 atomic_read(&disk->sync_io);
7245 /* sync IO will cause sync_io to increase before the disk_stats
7246 * as sync_io is counted when a request starts, and
7247 * disk_stats is counted when it completes.
7248 * So resync activity will cause curr_events to be smaller than
7249 * when there was no such activity.
7250 * non-sync IO will cause disk_stat to increase without
7251 * increasing sync_io so curr_events will (eventually)
7252 * be larger than it was before. Once it becomes
7253 * substantially larger, the test below will cause
7254 * the array to appear non-idle, and resync will slow
7256 * If there is a lot of outstanding resync activity when
7257 * we set last_event to curr_events, then all that activity
7258 * completing might cause the array to appear non-idle
7259 * and resync will be slowed down even though there might
7260 * not have been non-resync activity. This will only
7261 * happen once though. 'last_events' will soon reflect
7262 * the state where there is little or no outstanding
7263 * resync requests, and further resync activity will
7264 * always make curr_events less than last_events.
7267 if (init || curr_events - rdev->last_events > 64) {
7268 rdev->last_events = curr_events;
7276 void md_done_sync(struct mddev *mddev, int blocks, int ok)
7278 /* another "blocks" (512byte) blocks have been synced */
7279 atomic_sub(blocks, &mddev->recovery_active);
7280 wake_up(&mddev->recovery_wait);
7282 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7283 set_bit(MD_RECOVERY_ERROR, &mddev->recovery);
7284 md_wakeup_thread(mddev->thread);
7285 // stop recovery, signal do_sync ....
7290 /* md_write_start(mddev, bi)
7291 * If we need to update some array metadata (e.g. 'active' flag
7292 * in superblock) before writing, schedule a superblock update
7293 * and wait for it to complete.
7295 void md_write_start(struct mddev *mddev, struct bio *bi)
7298 if (bio_data_dir(bi) != WRITE)
7301 BUG_ON(mddev->ro == 1);
7302 if (mddev->ro == 2) {
7303 /* need to switch to read/write */
7305 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7306 md_wakeup_thread(mddev->thread);
7307 md_wakeup_thread(mddev->sync_thread);
7310 atomic_inc(&mddev->writes_pending);
7311 if (mddev->safemode == 1)
7312 mddev->safemode = 0;
7313 if (mddev->in_sync) {
7314 spin_lock_irq(&mddev->write_lock);
7315 if (mddev->in_sync) {
7317 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
7318 set_bit(MD_CHANGE_PENDING, &mddev->flags);
7319 md_wakeup_thread(mddev->thread);
7322 spin_unlock_irq(&mddev->write_lock);
7325 sysfs_notify_dirent_safe(mddev->sysfs_state);
7326 wait_event(mddev->sb_wait,
7327 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
7330 void md_write_end(struct mddev *mddev)
7332 if (atomic_dec_and_test(&mddev->writes_pending)) {
7333 if (mddev->safemode == 2)
7334 md_wakeup_thread(mddev->thread);
7335 else if (mddev->safemode_delay)
7336 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
7340 /* md_allow_write(mddev)
7341 * Calling this ensures that the array is marked 'active' so that writes
7342 * may proceed without blocking. It is important to call this before
7343 * attempting a GFP_KERNEL allocation while holding the mddev lock.
7344 * Must be called with mddev_lock held.
7346 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
7347 * is dropped, so return -EAGAIN after notifying userspace.
7349 int md_allow_write(struct mddev *mddev)
7355 if (!mddev->pers->sync_request)
7358 spin_lock_irq(&mddev->write_lock);
7359 if (mddev->in_sync) {
7361 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
7362 set_bit(MD_CHANGE_PENDING, &mddev->flags);
7363 if (mddev->safemode_delay &&
7364 mddev->safemode == 0)
7365 mddev->safemode = 1;
7366 spin_unlock_irq(&mddev->write_lock);
7367 md_update_sb(mddev, 0);
7368 sysfs_notify_dirent_safe(mddev->sysfs_state);
7370 spin_unlock_irq(&mddev->write_lock);
7372 if (test_bit(MD_CHANGE_PENDING, &mddev->flags))
7377 EXPORT_SYMBOL_GPL(md_allow_write);
7379 #define SYNC_MARKS 10
7380 #define SYNC_MARK_STEP (3*HZ)
7381 #define UPDATE_FREQUENCY (5*60*HZ)
7382 void md_do_sync(struct md_thread *thread)
7384 struct mddev *mddev = thread->mddev;
7385 struct mddev *mddev2;
7386 unsigned int currspeed = 0,
7388 sector_t max_sectors,j, io_sectors;
7389 unsigned long mark[SYNC_MARKS];
7390 unsigned long update_time;
7391 sector_t mark_cnt[SYNC_MARKS];
7393 struct list_head *tmp;
7394 sector_t last_check;
7396 struct md_rdev *rdev;
7397 char *desc, *action = NULL;
7398 struct blk_plug plug;
7400 /* just incase thread restarts... */
7401 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
7403 if (mddev->ro) /* never try to sync a read-only array */
7406 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
7407 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) {
7408 desc = "data-check";
7410 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
7411 desc = "requested-resync";
7415 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
7420 mddev->last_sync_action = action ?: desc;
7422 /* we overload curr_resync somewhat here.
7423 * 0 == not engaged in resync at all
7424 * 2 == checking that there is no conflict with another sync
7425 * 1 == like 2, but have yielded to allow conflicting resync to
7427 * other == active in resync - this many blocks
7429 * Before starting a resync we must have set curr_resync to
7430 * 2, and then checked that every "conflicting" array has curr_resync
7431 * less than ours. When we find one that is the same or higher
7432 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
7433 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
7434 * This will mean we have to start checking from the beginning again.
7439 mddev->curr_resync = 2;
7442 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
7444 for_each_mddev(mddev2, tmp) {
7445 if (mddev2 == mddev)
7447 if (!mddev->parallel_resync
7448 && mddev2->curr_resync
7449 && match_mddev_units(mddev, mddev2)) {
7451 if (mddev < mddev2 && mddev->curr_resync == 2) {
7452 /* arbitrarily yield */
7453 mddev->curr_resync = 1;
7454 wake_up(&resync_wait);
7456 if (mddev > mddev2 && mddev->curr_resync == 1)
7457 /* no need to wait here, we can wait the next
7458 * time 'round when curr_resync == 2
7461 /* We need to wait 'interruptible' so as not to
7462 * contribute to the load average, and not to
7463 * be caught by 'softlockup'
7465 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
7466 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
7467 mddev2->curr_resync >= mddev->curr_resync) {
7468 printk(KERN_INFO "md: delaying %s of %s"
7469 " until %s has finished (they"
7470 " share one or more physical units)\n",
7471 desc, mdname(mddev), mdname(mddev2));
7473 if (signal_pending(current))
7474 flush_signals(current);
7476 finish_wait(&resync_wait, &wq);
7479 finish_wait(&resync_wait, &wq);
7482 } while (mddev->curr_resync < 2);
7485 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
7486 /* resync follows the size requested by the personality,
7487 * which defaults to physical size, but can be virtual size
7489 max_sectors = mddev->resync_max_sectors;
7490 atomic64_set(&mddev->resync_mismatches, 0);
7491 /* we don't use the checkpoint if there's a bitmap */
7492 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
7493 j = mddev->resync_min;
7494 else if (!mddev->bitmap)
7495 j = mddev->recovery_cp;
7497 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
7498 max_sectors = mddev->resync_max_sectors;
7500 /* recovery follows the physical size of devices */
7501 max_sectors = mddev->dev_sectors;
7504 rdev_for_each_rcu(rdev, mddev)
7505 if (rdev->raid_disk >= 0 &&
7506 !test_bit(Faulty, &rdev->flags) &&
7507 !test_bit(In_sync, &rdev->flags) &&
7508 rdev->recovery_offset < j)
7509 j = rdev->recovery_offset;
7513 printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev));
7514 printk(KERN_INFO "md: minimum _guaranteed_ speed:"
7515 " %d KB/sec/disk.\n", speed_min(mddev));
7516 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
7517 "(but not more than %d KB/sec) for %s.\n",
7518 speed_max(mddev), desc);
7520 is_mddev_idle(mddev, 1); /* this initializes IO event counters */
7523 for (m = 0; m < SYNC_MARKS; m++) {
7525 mark_cnt[m] = io_sectors;
7528 mddev->resync_mark = mark[last_mark];
7529 mddev->resync_mark_cnt = mark_cnt[last_mark];
7532 * Tune reconstruction:
7534 window = 32*(PAGE_SIZE/512);
7535 printk(KERN_INFO "md: using %dk window, over a total of %lluk.\n",
7536 window/2, (unsigned long long)max_sectors/2);
7538 atomic_set(&mddev->recovery_active, 0);
7543 "md: resuming %s of %s from checkpoint.\n",
7544 desc, mdname(mddev));
7545 mddev->curr_resync = j;
7547 mddev->curr_resync = 3; /* no longer delayed */
7548 mddev->curr_resync_completed = j;
7549 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
7550 md_new_event(mddev);
7551 update_time = jiffies;
7553 blk_start_plug(&plug);
7554 while (j < max_sectors) {
7559 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
7560 ((mddev->curr_resync > mddev->curr_resync_completed &&
7561 (mddev->curr_resync - mddev->curr_resync_completed)
7562 > (max_sectors >> 4)) ||
7563 time_after_eq(jiffies, update_time + UPDATE_FREQUENCY) ||
7564 (j - mddev->curr_resync_completed)*2
7565 >= mddev->resync_max - mddev->curr_resync_completed
7567 /* time to update curr_resync_completed */
7568 wait_event(mddev->recovery_wait,
7569 atomic_read(&mddev->recovery_active) == 0);
7570 mddev->curr_resync_completed = j;
7571 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) &&
7572 j > mddev->recovery_cp)
7573 mddev->recovery_cp = j;
7574 update_time = jiffies;
7575 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
7576 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
7579 while (j >= mddev->resync_max &&
7580 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
7581 /* As this condition is controlled by user-space,
7582 * we can block indefinitely, so use '_interruptible'
7583 * to avoid triggering warnings.
7585 flush_signals(current); /* just in case */
7586 wait_event_interruptible(mddev->recovery_wait,
7587 mddev->resync_max > j
7588 || test_bit(MD_RECOVERY_INTR,
7592 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
7595 sectors = mddev->pers->sync_request(mddev, j, &skipped,
7596 currspeed < speed_min(mddev));
7598 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7602 if (!skipped) { /* actual IO requested */
7603 io_sectors += sectors;
7604 atomic_add(sectors, &mddev->recovery_active);
7607 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
7612 mddev->curr_resync = j;
7613 mddev->curr_mark_cnt = io_sectors;
7614 if (last_check == 0)
7615 /* this is the earliest that rebuild will be
7616 * visible in /proc/mdstat
7618 md_new_event(mddev);
7620 if (last_check + window > io_sectors || j == max_sectors)
7623 last_check = io_sectors;
7625 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
7627 int next = (last_mark+1) % SYNC_MARKS;
7629 mddev->resync_mark = mark[next];
7630 mddev->resync_mark_cnt = mark_cnt[next];
7631 mark[next] = jiffies;
7632 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
7636 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
7640 * this loop exits only if either when we are slower than
7641 * the 'hard' speed limit, or the system was IO-idle for
7643 * the system might be non-idle CPU-wise, but we only care
7644 * about not overloading the IO subsystem. (things like an
7645 * e2fsck being done on the RAID array should execute fast)
7649 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
7650 /((jiffies-mddev->resync_mark)/HZ +1) +1;
7652 if (currspeed > speed_min(mddev)) {
7653 if ((currspeed > speed_max(mddev)) ||
7654 !is_mddev_idle(mddev, 0)) {
7660 printk(KERN_INFO "md: %s: %s %s.\n",mdname(mddev), desc,
7661 test_bit(MD_RECOVERY_INTR, &mddev->recovery)
7662 ? "interrupted" : "done");
7664 * this also signals 'finished resyncing' to md_stop
7666 blk_finish_plug(&plug);
7667 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
7669 /* tell personality that we are finished */
7670 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
7672 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
7673 mddev->curr_resync > 2) {
7674 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
7675 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
7676 if (mddev->curr_resync >= mddev->recovery_cp) {
7678 "md: checkpointing %s of %s.\n",
7679 desc, mdname(mddev));
7680 if (test_bit(MD_RECOVERY_ERROR,
7682 mddev->recovery_cp =
7683 mddev->curr_resync_completed;
7685 mddev->recovery_cp =
7689 mddev->recovery_cp = MaxSector;
7691 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
7692 mddev->curr_resync = MaxSector;
7694 rdev_for_each_rcu(rdev, mddev)
7695 if (rdev->raid_disk >= 0 &&
7696 mddev->delta_disks >= 0 &&
7697 !test_bit(Faulty, &rdev->flags) &&
7698 !test_bit(In_sync, &rdev->flags) &&
7699 rdev->recovery_offset < mddev->curr_resync)
7700 rdev->recovery_offset = mddev->curr_resync;
7705 set_bit(MD_CHANGE_DEVS, &mddev->flags);
7707 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
7708 /* We completed so min/max setting can be forgotten if used. */
7709 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
7710 mddev->resync_min = 0;
7711 mddev->resync_max = MaxSector;
7712 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
7713 mddev->resync_min = mddev->curr_resync_completed;
7714 mddev->curr_resync = 0;
7715 wake_up(&resync_wait);
7716 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
7717 md_wakeup_thread(mddev->thread);
7720 EXPORT_SYMBOL_GPL(md_do_sync);
7722 static int remove_and_add_spares(struct mddev *mddev,
7723 struct md_rdev *this)
7725 struct md_rdev *rdev;
7729 rdev_for_each(rdev, mddev)
7730 if ((this == NULL || rdev == this) &&
7731 rdev->raid_disk >= 0 &&
7732 !test_bit(Blocked, &rdev->flags) &&
7733 (test_bit(Faulty, &rdev->flags) ||
7734 ! test_bit(In_sync, &rdev->flags)) &&
7735 atomic_read(&rdev->nr_pending)==0) {
7736 if (mddev->pers->hot_remove_disk(
7737 mddev, rdev) == 0) {
7738 sysfs_unlink_rdev(mddev, rdev);
7739 rdev->raid_disk = -1;
7743 if (removed && mddev->kobj.sd)
7744 sysfs_notify(&mddev->kobj, NULL, "degraded");
7749 rdev_for_each(rdev, mddev) {
7750 if (rdev->raid_disk >= 0 &&
7751 !test_bit(In_sync, &rdev->flags) &&
7752 !test_bit(Faulty, &rdev->flags))
7754 if (rdev->raid_disk >= 0)
7756 if (test_bit(Faulty, &rdev->flags))
7759 rdev->saved_raid_disk < 0)
7762 rdev->recovery_offset = 0;
7764 hot_add_disk(mddev, rdev) == 0) {
7765 if (sysfs_link_rdev(mddev, rdev))
7766 /* failure here is OK */;
7768 md_new_event(mddev);
7769 set_bit(MD_CHANGE_DEVS, &mddev->flags);
7774 set_bit(MD_CHANGE_DEVS, &mddev->flags);
7779 * This routine is regularly called by all per-raid-array threads to
7780 * deal with generic issues like resync and super-block update.
7781 * Raid personalities that don't have a thread (linear/raid0) do not
7782 * need this as they never do any recovery or update the superblock.
7784 * It does not do any resync itself, but rather "forks" off other threads
7785 * to do that as needed.
7786 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
7787 * "->recovery" and create a thread at ->sync_thread.
7788 * When the thread finishes it sets MD_RECOVERY_DONE
7789 * and wakeups up this thread which will reap the thread and finish up.
7790 * This thread also removes any faulty devices (with nr_pending == 0).
7792 * The overall approach is:
7793 * 1/ if the superblock needs updating, update it.
7794 * 2/ If a recovery thread is running, don't do anything else.
7795 * 3/ If recovery has finished, clean up, possibly marking spares active.
7796 * 4/ If there are any faulty devices, remove them.
7797 * 5/ If array is degraded, try to add spares devices
7798 * 6/ If array has spares or is not in-sync, start a resync thread.
7800 void md_check_recovery(struct mddev *mddev)
7802 if (mddev->suspended)
7806 bitmap_daemon_work(mddev);
7808 if (signal_pending(current)) {
7809 if (mddev->pers->sync_request && !mddev->external) {
7810 printk(KERN_INFO "md: %s in immediate safe mode\n",
7812 mddev->safemode = 2;
7814 flush_signals(current);
7817 if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
7820 (mddev->flags & ~ (1<<MD_CHANGE_PENDING)) ||
7821 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
7822 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
7823 (mddev->external == 0 && mddev->safemode == 1) ||
7824 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
7825 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
7829 if (mddev_trylock(mddev)) {
7833 /* On a read-only array we can:
7834 * - remove failed devices
7835 * - add already-in_sync devices if the array itself
7837 * As we only add devices that are already in-sync,
7838 * we can activate the spares immediately.
7840 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7841 remove_and_add_spares(mddev, NULL);
7842 mddev->pers->spare_active(mddev);
7846 if (!mddev->external) {
7848 spin_lock_irq(&mddev->write_lock);
7849 if (mddev->safemode &&
7850 !atomic_read(&mddev->writes_pending) &&
7852 mddev->recovery_cp == MaxSector) {
7855 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
7857 if (mddev->safemode == 1)
7858 mddev->safemode = 0;
7859 spin_unlock_irq(&mddev->write_lock);
7861 sysfs_notify_dirent_safe(mddev->sysfs_state);
7864 if (mddev->flags & MD_UPDATE_SB_FLAGS)
7865 md_update_sb(mddev, 0);
7867 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
7868 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
7869 /* resync/recovery still happening */
7870 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7873 if (mddev->sync_thread) {
7874 md_reap_sync_thread(mddev);
7877 /* Set RUNNING before clearing NEEDED to avoid
7878 * any transients in the value of "sync_action".
7880 mddev->curr_resync_completed = 0;
7881 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7882 /* Clear some bits that don't mean anything, but
7885 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
7886 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
7888 if (!test_and_clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
7889 test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
7891 /* no recovery is running.
7892 * remove any failed drives, then
7893 * add spares if possible.
7894 * Spares are also removed and re-added, to allow
7895 * the personality to fail the re-add.
7898 if (mddev->reshape_position != MaxSector) {
7899 if (mddev->pers->check_reshape == NULL ||
7900 mddev->pers->check_reshape(mddev) != 0)
7901 /* Cannot proceed */
7903 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
7904 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7905 } else if ((spares = remove_and_add_spares(mddev, NULL))) {
7906 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7907 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
7908 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
7909 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7910 } else if (mddev->recovery_cp < MaxSector) {
7911 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7912 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7913 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
7914 /* nothing to be done ... */
7917 if (mddev->pers->sync_request) {
7919 /* We are adding a device or devices to an array
7920 * which has the bitmap stored on all devices.
7921 * So make sure all bitmap pages get written
7923 bitmap_write_all(mddev->bitmap);
7925 mddev->sync_thread = md_register_thread(md_do_sync,
7928 if (!mddev->sync_thread) {
7929 printk(KERN_ERR "%s: could not start resync"
7932 /* leave the spares where they are, it shouldn't hurt */
7933 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7934 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7935 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
7936 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
7937 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
7939 md_wakeup_thread(mddev->sync_thread);
7940 sysfs_notify_dirent_safe(mddev->sysfs_action);
7941 md_new_event(mddev);
7944 wake_up(&mddev->sb_wait);
7946 if (!mddev->sync_thread) {
7947 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7948 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
7950 if (mddev->sysfs_action)
7951 sysfs_notify_dirent_safe(mddev->sysfs_action);
7953 mddev_unlock(mddev);
7957 void md_reap_sync_thread(struct mddev *mddev)
7959 struct md_rdev *rdev;
7961 /* resync has finished, collect result */
7962 md_unregister_thread(&mddev->sync_thread);
7963 wake_up(&resync_wait);
7964 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
7965 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
7967 /* activate any spares */
7968 if (mddev->pers->spare_active(mddev)) {
7969 sysfs_notify(&mddev->kobj, NULL,
7971 set_bit(MD_CHANGE_DEVS, &mddev->flags);
7974 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
7975 mddev->pers->finish_reshape)
7976 mddev->pers->finish_reshape(mddev);
7978 /* If array is no-longer degraded, then any saved_raid_disk
7979 * information must be scrapped. Also if any device is now
7980 * In_sync we must scrape the saved_raid_disk for that device
7981 * do the superblock for an incrementally recovered device
7984 rdev_for_each(rdev, mddev)
7985 if (!mddev->degraded ||
7986 test_bit(In_sync, &rdev->flags))
7987 rdev->saved_raid_disk = -1;
7989 md_update_sb(mddev, 1);
7990 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7991 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7992 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
7993 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
7994 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
7995 /* flag recovery needed just to double check */
7996 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7997 sysfs_notify_dirent_safe(mddev->sysfs_action);
7998 md_new_event(mddev);
7999 if (mddev->event_work.func)
8000 queue_work(md_misc_wq, &mddev->event_work);
8003 void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev)
8005 sysfs_notify_dirent_safe(rdev->sysfs_state);
8006 wait_event_timeout(rdev->blocked_wait,
8007 !test_bit(Blocked, &rdev->flags) &&
8008 !test_bit(BlockedBadBlocks, &rdev->flags),
8009 msecs_to_jiffies(5000));
8010 rdev_dec_pending(rdev, mddev);
8012 EXPORT_SYMBOL(md_wait_for_blocked_rdev);
8014 void md_finish_reshape(struct mddev *mddev)
8016 /* called be personality module when reshape completes. */
8017 struct md_rdev *rdev;
8019 rdev_for_each(rdev, mddev) {
8020 if (rdev->data_offset > rdev->new_data_offset)
8021 rdev->sectors += rdev->data_offset - rdev->new_data_offset;
8023 rdev->sectors -= rdev->new_data_offset - rdev->data_offset;
8024 rdev->data_offset = rdev->new_data_offset;
8027 EXPORT_SYMBOL(md_finish_reshape);
8029 /* Bad block management.
8030 * We can record which blocks on each device are 'bad' and so just
8031 * fail those blocks, or that stripe, rather than the whole device.
8032 * Entries in the bad-block table are 64bits wide. This comprises:
8033 * Length of bad-range, in sectors: 0-511 for lengths 1-512
8034 * Start of bad-range, sector offset, 54 bits (allows 8 exbibytes)
8035 * A 'shift' can be set so that larger blocks are tracked and
8036 * consequently larger devices can be covered.
8037 * 'Acknowledged' flag - 1 bit. - the most significant bit.
8039 * Locking of the bad-block table uses a seqlock so md_is_badblock
8040 * might need to retry if it is very unlucky.
8041 * We will sometimes want to check for bad blocks in a bi_end_io function,
8042 * so we use the write_seqlock_irq variant.
8044 * When looking for a bad block we specify a range and want to
8045 * know if any block in the range is bad. So we binary-search
8046 * to the last range that starts at-or-before the given endpoint,
8047 * (or "before the sector after the target range")
8048 * then see if it ends after the given start.
8050 * 0 if there are no known bad blocks in the range
8051 * 1 if there are known bad block which are all acknowledged
8052 * -1 if there are bad blocks which have not yet been acknowledged in metadata.
8053 * plus the start/length of the first bad section we overlap.
8055 int md_is_badblock(struct badblocks *bb, sector_t s, int sectors,
8056 sector_t *first_bad, int *bad_sectors)
8062 sector_t target = s + sectors;
8065 if (bb->shift > 0) {
8066 /* round the start down, and the end up */
8068 target += (1<<bb->shift) - 1;
8069 target >>= bb->shift;
8070 sectors = target - s;
8072 /* 'target' is now the first block after the bad range */
8075 seq = read_seqbegin(&bb->lock);
8080 /* Binary search between lo and hi for 'target'
8081 * i.e. for the last range that starts before 'target'
8083 /* INVARIANT: ranges before 'lo' and at-or-after 'hi'
8084 * are known not to be the last range before target.
8085 * VARIANT: hi-lo is the number of possible
8086 * ranges, and decreases until it reaches 1
8088 while (hi - lo > 1) {
8089 int mid = (lo + hi) / 2;
8090 sector_t a = BB_OFFSET(p[mid]);
8092 /* This could still be the one, earlier ranges
8096 /* This and later ranges are definitely out. */
8099 /* 'lo' might be the last that started before target, but 'hi' isn't */
8101 /* need to check all range that end after 's' to see if
8102 * any are unacknowledged.
8105 BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) {
8106 if (BB_OFFSET(p[lo]) < target) {
8107 /* starts before the end, and finishes after
8108 * the start, so they must overlap
8110 if (rv != -1 && BB_ACK(p[lo]))
8114 *first_bad = BB_OFFSET(p[lo]);
8115 *bad_sectors = BB_LEN(p[lo]);
8121 if (read_seqretry(&bb->lock, seq))
8126 EXPORT_SYMBOL_GPL(md_is_badblock);
8129 * Add a range of bad blocks to the table.
8130 * This might extend the table, or might contract it
8131 * if two adjacent ranges can be merged.
8132 * We binary-search to find the 'insertion' point, then
8133 * decide how best to handle it.
8135 static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors,
8141 unsigned long flags;
8144 /* badblocks are disabled */
8148 /* round the start down, and the end up */
8149 sector_t next = s + sectors;
8151 next += (1<<bb->shift) - 1;
8156 write_seqlock_irqsave(&bb->lock, flags);
8161 /* Find the last range that starts at-or-before 's' */
8162 while (hi - lo > 1) {
8163 int mid = (lo + hi) / 2;
8164 sector_t a = BB_OFFSET(p[mid]);
8170 if (hi > lo && BB_OFFSET(p[lo]) > s)
8174 /* we found a range that might merge with the start
8177 sector_t a = BB_OFFSET(p[lo]);
8178 sector_t e = a + BB_LEN(p[lo]);
8179 int ack = BB_ACK(p[lo]);
8181 /* Yes, we can merge with a previous range */
8182 if (s == a && s + sectors >= e)
8183 /* new range covers old */
8186 ack = ack && acknowledged;
8188 if (e < s + sectors)
8190 if (e - a <= BB_MAX_LEN) {
8191 p[lo] = BB_MAKE(a, e-a, ack);
8194 /* does not all fit in one range,
8195 * make p[lo] maximal
8197 if (BB_LEN(p[lo]) != BB_MAX_LEN)
8198 p[lo] = BB_MAKE(a, BB_MAX_LEN, ack);
8204 if (sectors && hi < bb->count) {
8205 /* 'hi' points to the first range that starts after 's'.
8206 * Maybe we can merge with the start of that range */
8207 sector_t a = BB_OFFSET(p[hi]);
8208 sector_t e = a + BB_LEN(p[hi]);
8209 int ack = BB_ACK(p[hi]);
8210 if (a <= s + sectors) {
8211 /* merging is possible */
8212 if (e <= s + sectors) {
8217 ack = ack && acknowledged;
8220 if (e - a <= BB_MAX_LEN) {
8221 p[hi] = BB_MAKE(a, e-a, ack);
8224 p[hi] = BB_MAKE(a, BB_MAX_LEN, ack);
8232 if (sectors == 0 && hi < bb->count) {
8233 /* we might be able to combine lo and hi */
8234 /* Note: 's' is at the end of 'lo' */
8235 sector_t a = BB_OFFSET(p[hi]);
8236 int lolen = BB_LEN(p[lo]);
8237 int hilen = BB_LEN(p[hi]);
8238 int newlen = lolen + hilen - (s - a);
8239 if (s >= a && newlen < BB_MAX_LEN) {
8240 /* yes, we can combine them */
8241 int ack = BB_ACK(p[lo]) && BB_ACK(p[hi]);
8242 p[lo] = BB_MAKE(BB_OFFSET(p[lo]), newlen, ack);
8243 memmove(p + hi, p + hi + 1,
8244 (bb->count - hi - 1) * 8);
8249 /* didn't merge (it all).
8250 * Need to add a range just before 'hi' */
8251 if (bb->count >= MD_MAX_BADBLOCKS) {
8252 /* No room for more */
8256 int this_sectors = sectors;
8257 memmove(p + hi + 1, p + hi,
8258 (bb->count - hi) * 8);
8261 if (this_sectors > BB_MAX_LEN)
8262 this_sectors = BB_MAX_LEN;
8263 p[hi] = BB_MAKE(s, this_sectors, acknowledged);
8264 sectors -= this_sectors;
8271 bb->unacked_exist = 1;
8272 write_sequnlock_irqrestore(&bb->lock, flags);
8277 int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
8282 s += rdev->new_data_offset;
8284 s += rdev->data_offset;
8285 rv = md_set_badblocks(&rdev->badblocks,
8288 /* Make sure they get written out promptly */
8289 sysfs_notify_dirent_safe(rdev->sysfs_state);
8290 set_bit(MD_CHANGE_CLEAN, &rdev->mddev->flags);
8291 md_wakeup_thread(rdev->mddev->thread);
8295 EXPORT_SYMBOL_GPL(rdev_set_badblocks);
8298 * Remove a range of bad blocks from the table.
8299 * This may involve extending the table if we spilt a region,
8300 * but it must not fail. So if the table becomes full, we just
8301 * drop the remove request.
8303 static int md_clear_badblocks(struct badblocks *bb, sector_t s, int sectors)
8307 sector_t target = s + sectors;
8310 if (bb->shift > 0) {
8311 /* When clearing we round the start up and the end down.
8312 * This should not matter as the shift should align with
8313 * the block size and no rounding should ever be needed.
8314 * However it is better the think a block is bad when it
8315 * isn't than to think a block is not bad when it is.
8317 s += (1<<bb->shift) - 1;
8319 target >>= bb->shift;
8320 sectors = target - s;
8323 write_seqlock_irq(&bb->lock);
8328 /* Find the last range that starts before 'target' */
8329 while (hi - lo > 1) {
8330 int mid = (lo + hi) / 2;
8331 sector_t a = BB_OFFSET(p[mid]);
8338 /* p[lo] is the last range that could overlap the
8339 * current range. Earlier ranges could also overlap,
8340 * but only this one can overlap the end of the range.
8342 if (BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > target) {
8343 /* Partial overlap, leave the tail of this range */
8344 int ack = BB_ACK(p[lo]);
8345 sector_t a = BB_OFFSET(p[lo]);
8346 sector_t end = a + BB_LEN(p[lo]);
8349 /* we need to split this range */
8350 if (bb->count >= MD_MAX_BADBLOCKS) {
8354 memmove(p+lo+1, p+lo, (bb->count - lo) * 8);
8356 p[lo] = BB_MAKE(a, s-a, ack);
8359 p[lo] = BB_MAKE(target, end - target, ack);
8360 /* there is no longer an overlap */
8365 BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) {
8366 /* This range does overlap */
8367 if (BB_OFFSET(p[lo]) < s) {
8368 /* Keep the early parts of this range. */
8369 int ack = BB_ACK(p[lo]);
8370 sector_t start = BB_OFFSET(p[lo]);
8371 p[lo] = BB_MAKE(start, s - start, ack);
8372 /* now low doesn't overlap, so.. */
8377 /* 'lo' is strictly before, 'hi' is strictly after,
8378 * anything between needs to be discarded
8381 memmove(p+lo+1, p+hi, (bb->count - hi) * 8);
8382 bb->count -= (hi - lo - 1);
8388 write_sequnlock_irq(&bb->lock);
8392 int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
8396 s += rdev->new_data_offset;
8398 s += rdev->data_offset;
8399 return md_clear_badblocks(&rdev->badblocks,
8402 EXPORT_SYMBOL_GPL(rdev_clear_badblocks);
8405 * Acknowledge all bad blocks in a list.
8406 * This only succeeds if ->changed is clear. It is used by
8407 * in-kernel metadata updates
8409 void md_ack_all_badblocks(struct badblocks *bb)
8411 if (bb->page == NULL || bb->changed)
8412 /* no point even trying */
8414 write_seqlock_irq(&bb->lock);
8416 if (bb->changed == 0 && bb->unacked_exist) {
8419 for (i = 0; i < bb->count ; i++) {
8420 if (!BB_ACK(p[i])) {
8421 sector_t start = BB_OFFSET(p[i]);
8422 int len = BB_LEN(p[i]);
8423 p[i] = BB_MAKE(start, len, 1);
8426 bb->unacked_exist = 0;
8428 write_sequnlock_irq(&bb->lock);
8430 EXPORT_SYMBOL_GPL(md_ack_all_badblocks);
8432 /* sysfs access to bad-blocks list.
8433 * We present two files.
8434 * 'bad-blocks' lists sector numbers and lengths of ranges that
8435 * are recorded as bad. The list is truncated to fit within
8436 * the one-page limit of sysfs.
8437 * Writing "sector length" to this file adds an acknowledged
8439 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
8440 * been acknowledged. Writing to this file adds bad blocks
8441 * without acknowledging them. This is largely for testing.
8445 badblocks_show(struct badblocks *bb, char *page, int unack)
8456 seq = read_seqbegin(&bb->lock);
8461 while (len < PAGE_SIZE && i < bb->count) {
8462 sector_t s = BB_OFFSET(p[i]);
8463 unsigned int length = BB_LEN(p[i]);
8464 int ack = BB_ACK(p[i]);
8470 len += snprintf(page+len, PAGE_SIZE-len, "%llu %u\n",
8471 (unsigned long long)s << bb->shift,
8472 length << bb->shift);
8474 if (unack && len == 0)
8475 bb->unacked_exist = 0;
8477 if (read_seqretry(&bb->lock, seq))
8486 badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack)
8488 unsigned long long sector;
8492 /* Allow clearing via sysfs *only* for testing/debugging.
8493 * Normally only a successful write may clear a badblock
8496 if (page[0] == '-') {
8500 #endif /* DO_DEBUG */
8502 switch (sscanf(page, "%llu %d%c", §or, &length, &newline)) {
8504 if (newline != '\n')
8516 md_clear_badblocks(bb, sector, length);
8519 #endif /* DO_DEBUG */
8520 if (md_set_badblocks(bb, sector, length, !unack))
8526 static int md_notify_reboot(struct notifier_block *this,
8527 unsigned long code, void *x)
8529 struct list_head *tmp;
8530 struct mddev *mddev;
8533 for_each_mddev(mddev, tmp) {
8534 if (mddev_trylock(mddev)) {
8536 __md_stop_writes(mddev);
8537 mddev->safemode = 2;
8538 mddev_unlock(mddev);
8543 * certain more exotic SCSI devices are known to be
8544 * volatile wrt too early system reboots. While the
8545 * right place to handle this issue is the given
8546 * driver, we do want to have a safe RAID driver ...
8554 static struct notifier_block md_notifier = {
8555 .notifier_call = md_notify_reboot,
8557 .priority = INT_MAX, /* before any real devices */
8560 static void md_geninit(void)
8562 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
8564 proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops);
8567 static int __init md_init(void)
8571 md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0);
8575 md_misc_wq = alloc_workqueue("md_misc", 0, 0);
8579 if ((ret = register_blkdev(MD_MAJOR, "md")) < 0)
8582 if ((ret = register_blkdev(0, "mdp")) < 0)
8586 blk_register_region(MKDEV(MD_MAJOR, 0), 1UL<<MINORBITS, THIS_MODULE,
8587 md_probe, NULL, NULL);
8588 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
8589 md_probe, NULL, NULL);
8591 register_reboot_notifier(&md_notifier);
8592 raid_table_header = register_sysctl_table(raid_root_table);
8598 unregister_blkdev(MD_MAJOR, "md");
8600 destroy_workqueue(md_misc_wq);
8602 destroy_workqueue(md_wq);
8610 * Searches all registered partitions for autorun RAID arrays
8614 static LIST_HEAD(all_detected_devices);
8615 struct detected_devices_node {
8616 struct list_head list;
8620 void md_autodetect_dev(dev_t dev)
8622 struct detected_devices_node *node_detected_dev;
8624 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
8625 if (node_detected_dev) {
8626 node_detected_dev->dev = dev;
8627 list_add_tail(&node_detected_dev->list, &all_detected_devices);
8629 printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed"
8630 ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev));
8635 static void autostart_arrays(int part)
8637 struct md_rdev *rdev;
8638 struct detected_devices_node *node_detected_dev;
8640 int i_scanned, i_passed;
8645 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
8647 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
8649 node_detected_dev = list_entry(all_detected_devices.next,
8650 struct detected_devices_node, list);
8651 list_del(&node_detected_dev->list);
8652 dev = node_detected_dev->dev;
8653 kfree(node_detected_dev);
8654 rdev = md_import_device(dev,0, 90);
8658 if (test_bit(Faulty, &rdev->flags)) {
8662 set_bit(AutoDetected, &rdev->flags);
8663 list_add(&rdev->same_set, &pending_raid_disks);
8667 printk(KERN_INFO "md: Scanned %d and added %d devices.\n",
8668 i_scanned, i_passed);
8670 autorun_devices(part);
8673 #endif /* !MODULE */
8675 static __exit void md_exit(void)
8677 struct mddev *mddev;
8678 struct list_head *tmp;
8680 blk_unregister_region(MKDEV(MD_MAJOR,0), 1U << MINORBITS);
8681 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
8683 unregister_blkdev(MD_MAJOR,"md");
8684 unregister_blkdev(mdp_major, "mdp");
8685 unregister_reboot_notifier(&md_notifier);
8686 unregister_sysctl_table(raid_table_header);
8687 remove_proc_entry("mdstat", NULL);
8688 for_each_mddev(mddev, tmp) {
8689 export_array(mddev);
8690 mddev->hold_active = 0;
8692 destroy_workqueue(md_misc_wq);
8693 destroy_workqueue(md_wq);
8696 subsys_initcall(md_init);
8697 module_exit(md_exit)
8699 static int get_ro(char *buffer, struct kernel_param *kp)
8701 return sprintf(buffer, "%d", start_readonly);
8703 static int set_ro(const char *val, struct kernel_param *kp)
8706 int num = simple_strtoul(val, &e, 10);
8707 if (*val && (*e == '\0' || *e == '\n')) {
8708 start_readonly = num;
8714 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
8715 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
8717 module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR);
8719 EXPORT_SYMBOL(register_md_personality);
8720 EXPORT_SYMBOL(unregister_md_personality);
8721 EXPORT_SYMBOL(md_error);
8722 EXPORT_SYMBOL(md_done_sync);
8723 EXPORT_SYMBOL(md_write_start);
8724 EXPORT_SYMBOL(md_write_end);
8725 EXPORT_SYMBOL(md_register_thread);
8726 EXPORT_SYMBOL(md_unregister_thread);
8727 EXPORT_SYMBOL(md_wakeup_thread);
8728 EXPORT_SYMBOL(md_check_recovery);
8729 EXPORT_SYMBOL(md_reap_sync_thread);
8730 MODULE_LICENSE("GPL");
8731 MODULE_DESCRIPTION("MD RAID framework");
8733 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);