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>
39 #include <linux/mutex.h>
40 #include <linux/buffer_head.h> /* for invalidate_bdev */
41 #include <linux/poll.h>
42 #include <linux/ctype.h>
43 #include <linux/string.h>
44 #include <linux/hdreg.h>
45 #include <linux/proc_fs.h>
46 #include <linux/random.h>
47 #include <linux/module.h>
48 #include <linux/reboot.h>
49 #include <linux/file.h>
50 #include <linux/compat.h>
51 #include <linux/delay.h>
52 #include <linux/raid/md_p.h>
53 #include <linux/raid/md_u.h>
54 #include <linux/slab.h>
59 static void autostart_arrays(int part);
62 /* pers_list is a list of registered personalities protected
64 * pers_lock does extra service to protect accesses to
65 * mddev->thread when the mutex cannot be held.
67 static LIST_HEAD(pers_list);
68 static DEFINE_SPINLOCK(pers_lock);
70 static void md_print_devices(void);
72 static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
73 static struct workqueue_struct *md_wq;
74 static struct workqueue_struct *md_misc_wq;
76 #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
79 * Default number of read corrections we'll attempt on an rdev
80 * before ejecting it from the array. We divide the read error
81 * count by 2 for every hour elapsed between read errors.
83 #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
85 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
86 * is 1000 KB/sec, so the extra system load does not show up that much.
87 * Increase it if you want to have more _guaranteed_ speed. Note that
88 * the RAID driver will use the maximum available bandwidth if the IO
89 * subsystem is idle. There is also an 'absolute maximum' reconstruction
90 * speed limit - in case reconstruction slows down your system despite
93 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
94 * or /sys/block/mdX/md/sync_speed_{min,max}
97 static int sysctl_speed_limit_min = 1000;
98 static int sysctl_speed_limit_max = 200000;
99 static inline int speed_min(struct mddev *mddev)
101 return mddev->sync_speed_min ?
102 mddev->sync_speed_min : sysctl_speed_limit_min;
105 static inline int speed_max(struct mddev *mddev)
107 return mddev->sync_speed_max ?
108 mddev->sync_speed_max : sysctl_speed_limit_max;
111 static struct ctl_table_header *raid_table_header;
113 static ctl_table raid_table[] = {
115 .procname = "speed_limit_min",
116 .data = &sysctl_speed_limit_min,
117 .maxlen = sizeof(int),
118 .mode = S_IRUGO|S_IWUSR,
119 .proc_handler = proc_dointvec,
122 .procname = "speed_limit_max",
123 .data = &sysctl_speed_limit_max,
124 .maxlen = sizeof(int),
125 .mode = S_IRUGO|S_IWUSR,
126 .proc_handler = proc_dointvec,
131 static ctl_table raid_dir_table[] = {
135 .mode = S_IRUGO|S_IXUGO,
141 static ctl_table raid_root_table[] = {
146 .child = raid_dir_table,
151 static const struct block_device_operations md_fops;
153 static int start_readonly;
156 * like bio_clone, but with a local bio set
159 static void mddev_bio_destructor(struct bio *bio)
161 struct mddev *mddev, **mddevp;
166 bio_free(bio, mddev->bio_set);
169 struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs,
173 struct mddev **mddevp;
175 if (!mddev || !mddev->bio_set)
176 return bio_alloc(gfp_mask, nr_iovecs);
178 b = bio_alloc_bioset(gfp_mask, nr_iovecs,
184 b->bi_destructor = mddev_bio_destructor;
187 EXPORT_SYMBOL_GPL(bio_alloc_mddev);
189 struct bio *bio_clone_mddev(struct bio *bio, gfp_t gfp_mask,
193 struct mddev **mddevp;
195 if (!mddev || !mddev->bio_set)
196 return bio_clone(bio, gfp_mask);
198 b = bio_alloc_bioset(gfp_mask, bio->bi_max_vecs,
204 b->bi_destructor = mddev_bio_destructor;
206 if (bio_integrity(bio)) {
209 ret = bio_integrity_clone(b, bio, gfp_mask, mddev->bio_set);
219 EXPORT_SYMBOL_GPL(bio_clone_mddev);
221 void md_trim_bio(struct bio *bio, int offset, int size)
223 /* 'bio' is a cloned bio which we need to trim to match
224 * the given offset and size.
225 * This requires adjusting bi_sector, bi_size, and bi_io_vec
228 struct bio_vec *bvec;
232 if (offset == 0 && size == bio->bi_size)
235 bio->bi_sector += offset;
238 clear_bit(BIO_SEG_VALID, &bio->bi_flags);
240 while (bio->bi_idx < bio->bi_vcnt &&
241 bio->bi_io_vec[bio->bi_idx].bv_len <= offset) {
242 /* remove this whole bio_vec */
243 offset -= bio->bi_io_vec[bio->bi_idx].bv_len;
246 if (bio->bi_idx < bio->bi_vcnt) {
247 bio->bi_io_vec[bio->bi_idx].bv_offset += offset;
248 bio->bi_io_vec[bio->bi_idx].bv_len -= offset;
250 /* avoid any complications with bi_idx being non-zero*/
252 memmove(bio->bi_io_vec, bio->bi_io_vec+bio->bi_idx,
253 (bio->bi_vcnt - bio->bi_idx) * sizeof(struct bio_vec));
254 bio->bi_vcnt -= bio->bi_idx;
257 /* Make sure vcnt and last bv are not too big */
258 bio_for_each_segment(bvec, bio, i) {
259 if (sofar + bvec->bv_len > size)
260 bvec->bv_len = size - sofar;
261 if (bvec->bv_len == 0) {
265 sofar += bvec->bv_len;
268 EXPORT_SYMBOL_GPL(md_trim_bio);
271 * We have a system wide 'event count' that is incremented
272 * on any 'interesting' event, and readers of /proc/mdstat
273 * can use 'poll' or 'select' to find out when the event
277 * start array, stop array, error, add device, remove device,
278 * start build, activate spare
280 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
281 static atomic_t md_event_count;
282 void md_new_event(struct mddev *mddev)
284 atomic_inc(&md_event_count);
285 wake_up(&md_event_waiters);
287 EXPORT_SYMBOL_GPL(md_new_event);
289 /* Alternate version that can be called from interrupts
290 * when calling sysfs_notify isn't needed.
292 static void md_new_event_inintr(struct mddev *mddev)
294 atomic_inc(&md_event_count);
295 wake_up(&md_event_waiters);
299 * Enables to iterate over all existing md arrays
300 * all_mddevs_lock protects this list.
302 static LIST_HEAD(all_mddevs);
303 static DEFINE_SPINLOCK(all_mddevs_lock);
307 * iterates through all used mddevs in the system.
308 * We take care to grab the all_mddevs_lock whenever navigating
309 * the list, and to always hold a refcount when unlocked.
310 * Any code which breaks out of this loop while own
311 * a reference to the current mddev and must mddev_put it.
313 #define for_each_mddev(_mddev,_tmp) \
315 for (({ spin_lock(&all_mddevs_lock); \
316 _tmp = all_mddevs.next; \
318 ({ if (_tmp != &all_mddevs) \
319 mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\
320 spin_unlock(&all_mddevs_lock); \
321 if (_mddev) mddev_put(_mddev); \
322 _mddev = list_entry(_tmp, struct mddev, all_mddevs); \
323 _tmp != &all_mddevs;}); \
324 ({ spin_lock(&all_mddevs_lock); \
325 _tmp = _tmp->next;}) \
329 /* Rather than calling directly into the personality make_request function,
330 * IO requests come here first so that we can check if the device is
331 * being suspended pending a reconfiguration.
332 * We hold a refcount over the call to ->make_request. By the time that
333 * call has finished, the bio has been linked into some internal structure
334 * and so is visible to ->quiesce(), so we don't need the refcount any more.
336 static void md_make_request(struct request_queue *q, struct bio *bio)
338 const int rw = bio_data_dir(bio);
339 struct mddev *mddev = q->queuedata;
341 unsigned int sectors;
343 if (mddev == NULL || mddev->pers == NULL
348 smp_rmb(); /* Ensure implications of 'active' are visible */
350 if (mddev->suspended) {
353 prepare_to_wait(&mddev->sb_wait, &__wait,
354 TASK_UNINTERRUPTIBLE);
355 if (!mddev->suspended)
361 finish_wait(&mddev->sb_wait, &__wait);
363 atomic_inc(&mddev->active_io);
367 * save the sectors now since our bio can
368 * go away inside make_request
370 sectors = bio_sectors(bio);
371 mddev->pers->make_request(mddev, bio);
373 cpu = part_stat_lock();
374 part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]);
375 part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw], sectors);
378 if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended)
379 wake_up(&mddev->sb_wait);
382 /* mddev_suspend makes sure no new requests are submitted
383 * to the device, and that any requests that have been submitted
384 * are completely handled.
385 * Once ->stop is called and completes, the module will be completely
388 void mddev_suspend(struct mddev *mddev)
390 BUG_ON(mddev->suspended);
391 mddev->suspended = 1;
393 wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0);
394 mddev->pers->quiesce(mddev, 1);
396 del_timer_sync(&mddev->safemode_timer);
398 EXPORT_SYMBOL_GPL(mddev_suspend);
400 void mddev_resume(struct mddev *mddev)
402 mddev->suspended = 0;
403 wake_up(&mddev->sb_wait);
404 mddev->pers->quiesce(mddev, 0);
406 md_wakeup_thread(mddev->thread);
407 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
409 EXPORT_SYMBOL_GPL(mddev_resume);
411 int mddev_congested(struct mddev *mddev, int bits)
413 return mddev->suspended;
415 EXPORT_SYMBOL(mddev_congested);
418 * Generic flush handling for md
421 static void md_end_flush(struct bio *bio, int err)
423 struct md_rdev *rdev = bio->bi_private;
424 struct mddev *mddev = rdev->mddev;
426 rdev_dec_pending(rdev, mddev);
428 if (atomic_dec_and_test(&mddev->flush_pending)) {
429 /* The pre-request flush has finished */
430 queue_work(md_wq, &mddev->flush_work);
435 static void md_submit_flush_data(struct work_struct *ws);
437 static void submit_flushes(struct work_struct *ws)
439 struct mddev *mddev = container_of(ws, struct mddev, flush_work);
440 struct md_rdev *rdev;
442 INIT_WORK(&mddev->flush_work, md_submit_flush_data);
443 atomic_set(&mddev->flush_pending, 1);
445 list_for_each_entry_rcu(rdev, &mddev->disks, same_set)
446 if (rdev->raid_disk >= 0 &&
447 !test_bit(Faulty, &rdev->flags)) {
448 /* Take two references, one is dropped
449 * when request finishes, one after
450 * we reclaim rcu_read_lock
453 atomic_inc(&rdev->nr_pending);
454 atomic_inc(&rdev->nr_pending);
456 bi = bio_alloc_mddev(GFP_NOIO, 0, mddev);
457 bi->bi_end_io = md_end_flush;
458 bi->bi_private = rdev;
459 bi->bi_bdev = rdev->bdev;
460 atomic_inc(&mddev->flush_pending);
461 submit_bio(WRITE_FLUSH, bi);
463 rdev_dec_pending(rdev, mddev);
466 if (atomic_dec_and_test(&mddev->flush_pending))
467 queue_work(md_wq, &mddev->flush_work);
470 static void md_submit_flush_data(struct work_struct *ws)
472 struct mddev *mddev = container_of(ws, struct mddev, flush_work);
473 struct bio *bio = mddev->flush_bio;
475 if (bio->bi_size == 0)
476 /* an empty barrier - all done */
479 bio->bi_rw &= ~REQ_FLUSH;
480 mddev->pers->make_request(mddev, bio);
483 mddev->flush_bio = NULL;
484 wake_up(&mddev->sb_wait);
487 void md_flush_request(struct mddev *mddev, struct bio *bio)
489 spin_lock_irq(&mddev->write_lock);
490 wait_event_lock_irq(mddev->sb_wait,
492 mddev->write_lock, /*nothing*/);
493 mddev->flush_bio = bio;
494 spin_unlock_irq(&mddev->write_lock);
496 INIT_WORK(&mddev->flush_work, submit_flushes);
497 queue_work(md_wq, &mddev->flush_work);
499 EXPORT_SYMBOL(md_flush_request);
501 /* Support for plugging.
502 * This mirrors the plugging support in request_queue, but does not
503 * require having a whole queue or request structures.
504 * We allocate an md_plug_cb for each md device and each thread it gets
505 * plugged on. This links tot the private plug_handle structure in the
506 * personality data where we keep a count of the number of outstanding
507 * plugs so other code can see if a plug is active.
510 struct blk_plug_cb cb;
514 static void plugger_unplug(struct blk_plug_cb *cb)
516 struct md_plug_cb *mdcb = container_of(cb, struct md_plug_cb, cb);
517 if (atomic_dec_and_test(&mdcb->mddev->plug_cnt))
518 md_wakeup_thread(mdcb->mddev->thread);
522 /* Check that an unplug wakeup will come shortly.
523 * If not, wakeup the md thread immediately
525 int mddev_check_plugged(struct mddev *mddev)
527 struct blk_plug *plug = current->plug;
528 struct md_plug_cb *mdcb;
533 list_for_each_entry(mdcb, &plug->cb_list, cb.list) {
534 if (mdcb->cb.callback == plugger_unplug &&
535 mdcb->mddev == mddev) {
536 /* Already on the list, move to top */
537 if (mdcb != list_first_entry(&plug->cb_list,
540 list_move(&mdcb->cb.list, &plug->cb_list);
544 /* Not currently on the callback list */
545 mdcb = kmalloc(sizeof(*mdcb), GFP_ATOMIC);
550 mdcb->cb.callback = plugger_unplug;
551 atomic_inc(&mddev->plug_cnt);
552 list_add(&mdcb->cb.list, &plug->cb_list);
555 EXPORT_SYMBOL_GPL(mddev_check_plugged);
557 static inline struct mddev *mddev_get(struct mddev *mddev)
559 atomic_inc(&mddev->active);
563 static void mddev_delayed_delete(struct work_struct *ws);
565 static void mddev_put(struct mddev *mddev)
567 struct bio_set *bs = NULL;
569 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
571 if (!mddev->raid_disks && list_empty(&mddev->disks) &&
572 mddev->ctime == 0 && !mddev->hold_active) {
573 /* Array is not configured at all, and not held active,
575 list_del_init(&mddev->all_mddevs);
577 mddev->bio_set = NULL;
578 if (mddev->gendisk) {
579 /* We did a probe so need to clean up. Call
580 * queue_work inside the spinlock so that
581 * flush_workqueue() after mddev_find will
582 * succeed in waiting for the work to be done.
584 INIT_WORK(&mddev->del_work, mddev_delayed_delete);
585 queue_work(md_misc_wq, &mddev->del_work);
589 spin_unlock(&all_mddevs_lock);
594 void mddev_init(struct mddev *mddev)
596 mutex_init(&mddev->open_mutex);
597 mutex_init(&mddev->reconfig_mutex);
598 mutex_init(&mddev->bitmap_info.mutex);
599 INIT_LIST_HEAD(&mddev->disks);
600 INIT_LIST_HEAD(&mddev->all_mddevs);
601 init_timer(&mddev->safemode_timer);
602 atomic_set(&mddev->active, 1);
603 atomic_set(&mddev->openers, 0);
604 atomic_set(&mddev->active_io, 0);
605 atomic_set(&mddev->plug_cnt, 0);
606 spin_lock_init(&mddev->write_lock);
607 atomic_set(&mddev->flush_pending, 0);
608 init_waitqueue_head(&mddev->sb_wait);
609 init_waitqueue_head(&mddev->recovery_wait);
610 mddev->reshape_position = MaxSector;
611 mddev->resync_min = 0;
612 mddev->resync_max = MaxSector;
613 mddev->level = LEVEL_NONE;
615 EXPORT_SYMBOL_GPL(mddev_init);
617 static struct mddev * mddev_find(dev_t unit)
619 struct mddev *mddev, *new = NULL;
621 if (unit && MAJOR(unit) != MD_MAJOR)
622 unit &= ~((1<<MdpMinorShift)-1);
625 spin_lock(&all_mddevs_lock);
628 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
629 if (mddev->unit == unit) {
631 spin_unlock(&all_mddevs_lock);
637 list_add(&new->all_mddevs, &all_mddevs);
638 spin_unlock(&all_mddevs_lock);
639 new->hold_active = UNTIL_IOCTL;
643 /* find an unused unit number */
644 static int next_minor = 512;
645 int start = next_minor;
649 dev = MKDEV(MD_MAJOR, next_minor);
651 if (next_minor > MINORMASK)
653 if (next_minor == start) {
654 /* Oh dear, all in use. */
655 spin_unlock(&all_mddevs_lock);
661 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
662 if (mddev->unit == dev) {
668 new->md_minor = MINOR(dev);
669 new->hold_active = UNTIL_STOP;
670 list_add(&new->all_mddevs, &all_mddevs);
671 spin_unlock(&all_mddevs_lock);
674 spin_unlock(&all_mddevs_lock);
676 new = kzalloc(sizeof(*new), GFP_KERNEL);
681 if (MAJOR(unit) == MD_MAJOR)
682 new->md_minor = MINOR(unit);
684 new->md_minor = MINOR(unit) >> MdpMinorShift;
691 static inline int mddev_lock(struct mddev * mddev)
693 return mutex_lock_interruptible(&mddev->reconfig_mutex);
696 static inline int mddev_is_locked(struct mddev *mddev)
698 return mutex_is_locked(&mddev->reconfig_mutex);
701 static inline int mddev_trylock(struct mddev * mddev)
703 return mutex_trylock(&mddev->reconfig_mutex);
706 static struct attribute_group md_redundancy_group;
708 static void mddev_unlock(struct mddev * mddev)
710 if (mddev->to_remove) {
711 /* These cannot be removed under reconfig_mutex as
712 * an access to the files will try to take reconfig_mutex
713 * while holding the file unremovable, which leads to
715 * So hold set sysfs_active while the remove in happeing,
716 * and anything else which might set ->to_remove or my
717 * otherwise change the sysfs namespace will fail with
718 * -EBUSY if sysfs_active is still set.
719 * We set sysfs_active under reconfig_mutex and elsewhere
720 * test it under the same mutex to ensure its correct value
723 struct attribute_group *to_remove = mddev->to_remove;
724 mddev->to_remove = NULL;
725 mddev->sysfs_active = 1;
726 mutex_unlock(&mddev->reconfig_mutex);
728 if (mddev->kobj.sd) {
729 if (to_remove != &md_redundancy_group)
730 sysfs_remove_group(&mddev->kobj, to_remove);
731 if (mddev->pers == NULL ||
732 mddev->pers->sync_request == NULL) {
733 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
734 if (mddev->sysfs_action)
735 sysfs_put(mddev->sysfs_action);
736 mddev->sysfs_action = NULL;
739 mddev->sysfs_active = 0;
741 mutex_unlock(&mddev->reconfig_mutex);
743 /* As we've dropped the mutex we need a spinlock to
744 * make sure the thread doesn't disappear
746 spin_lock(&pers_lock);
747 md_wakeup_thread(mddev->thread);
748 spin_unlock(&pers_lock);
751 static struct md_rdev * find_rdev_nr(struct mddev *mddev, int nr)
753 struct md_rdev *rdev;
755 list_for_each_entry(rdev, &mddev->disks, same_set)
756 if (rdev->desc_nr == nr)
762 static struct md_rdev * find_rdev(struct mddev * mddev, dev_t dev)
764 struct md_rdev *rdev;
766 list_for_each_entry(rdev, &mddev->disks, same_set)
767 if (rdev->bdev->bd_dev == dev)
773 static struct md_personality *find_pers(int level, char *clevel)
775 struct md_personality *pers;
776 list_for_each_entry(pers, &pers_list, list) {
777 if (level != LEVEL_NONE && pers->level == level)
779 if (strcmp(pers->name, clevel)==0)
785 /* return the offset of the super block in 512byte sectors */
786 static inline sector_t calc_dev_sboffset(struct md_rdev *rdev)
788 sector_t num_sectors = i_size_read(rdev->bdev->bd_inode) / 512;
789 return MD_NEW_SIZE_SECTORS(num_sectors);
792 static int alloc_disk_sb(struct md_rdev * rdev)
797 rdev->sb_page = alloc_page(GFP_KERNEL);
798 if (!rdev->sb_page) {
799 printk(KERN_ALERT "md: out of memory.\n");
806 static void free_disk_sb(struct md_rdev * rdev)
809 put_page(rdev->sb_page);
811 rdev->sb_page = NULL;
816 put_page(rdev->bb_page);
817 rdev->bb_page = NULL;
822 static void super_written(struct bio *bio, int error)
824 struct md_rdev *rdev = bio->bi_private;
825 struct mddev *mddev = rdev->mddev;
827 if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) {
828 printk("md: super_written gets error=%d, uptodate=%d\n",
829 error, test_bit(BIO_UPTODATE, &bio->bi_flags));
830 WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags));
831 md_error(mddev, rdev);
834 if (atomic_dec_and_test(&mddev->pending_writes))
835 wake_up(&mddev->sb_wait);
839 void md_super_write(struct mddev *mddev, struct md_rdev *rdev,
840 sector_t sector, int size, struct page *page)
842 /* write first size bytes of page to sector of rdev
843 * Increment mddev->pending_writes before returning
844 * and decrement it on completion, waking up sb_wait
845 * if zero is reached.
846 * If an error occurred, call md_error
848 struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, mddev);
850 bio->bi_bdev = rdev->meta_bdev ? rdev->meta_bdev : rdev->bdev;
851 bio->bi_sector = sector;
852 bio_add_page(bio, page, size, 0);
853 bio->bi_private = rdev;
854 bio->bi_end_io = super_written;
856 atomic_inc(&mddev->pending_writes);
857 submit_bio(WRITE_FLUSH_FUA, bio);
860 void md_super_wait(struct mddev *mddev)
862 /* wait for all superblock writes that were scheduled to complete */
865 prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE);
866 if (atomic_read(&mddev->pending_writes)==0)
870 finish_wait(&mddev->sb_wait, &wq);
873 static void bi_complete(struct bio *bio, int error)
875 complete((struct completion*)bio->bi_private);
878 int sync_page_io(struct md_rdev *rdev, sector_t sector, int size,
879 struct page *page, int rw, bool metadata_op)
881 struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, rdev->mddev);
882 struct completion event;
887 bio->bi_bdev = (metadata_op && rdev->meta_bdev) ?
888 rdev->meta_bdev : rdev->bdev;
890 bio->bi_sector = sector + rdev->sb_start;
892 bio->bi_sector = sector + rdev->data_offset;
893 bio_add_page(bio, page, size, 0);
894 init_completion(&event);
895 bio->bi_private = &event;
896 bio->bi_end_io = bi_complete;
898 wait_for_completion(&event);
900 ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
904 EXPORT_SYMBOL_GPL(sync_page_io);
906 static int read_disk_sb(struct md_rdev * rdev, int size)
908 char b[BDEVNAME_SIZE];
909 if (!rdev->sb_page) {
917 if (!sync_page_io(rdev, 0, size, rdev->sb_page, READ, true))
923 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
924 bdevname(rdev->bdev,b));
928 static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
930 return sb1->set_uuid0 == sb2->set_uuid0 &&
931 sb1->set_uuid1 == sb2->set_uuid1 &&
932 sb1->set_uuid2 == sb2->set_uuid2 &&
933 sb1->set_uuid3 == sb2->set_uuid3;
936 static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
939 mdp_super_t *tmp1, *tmp2;
941 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
942 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
944 if (!tmp1 || !tmp2) {
946 printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n");
954 * nr_disks is not constant
959 ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0);
967 static u32 md_csum_fold(u32 csum)
969 csum = (csum & 0xffff) + (csum >> 16);
970 return (csum & 0xffff) + (csum >> 16);
973 static unsigned int calc_sb_csum(mdp_super_t * sb)
976 u32 *sb32 = (u32*)sb;
978 unsigned int disk_csum, csum;
980 disk_csum = sb->sb_csum;
983 for (i = 0; i < MD_SB_BYTES/4 ; i++)
985 csum = (newcsum & 0xffffffff) + (newcsum>>32);
989 /* This used to use csum_partial, which was wrong for several
990 * reasons including that different results are returned on
991 * different architectures. It isn't critical that we get exactly
992 * the same return value as before (we always csum_fold before
993 * testing, and that removes any differences). However as we
994 * know that csum_partial always returned a 16bit value on
995 * alphas, do a fold to maximise conformity to previous behaviour.
997 sb->sb_csum = md_csum_fold(disk_csum);
999 sb->sb_csum = disk_csum;
1006 * Handle superblock details.
1007 * We want to be able to handle multiple superblock formats
1008 * so we have a common interface to them all, and an array of
1009 * different handlers.
1010 * We rely on user-space to write the initial superblock, and support
1011 * reading and updating of superblocks.
1012 * Interface methods are:
1013 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version)
1014 * loads and validates a superblock on dev.
1015 * if refdev != NULL, compare superblocks on both devices
1017 * 0 - dev has a superblock that is compatible with refdev
1018 * 1 - dev has a superblock that is compatible and newer than refdev
1019 * so dev should be used as the refdev in future
1020 * -EINVAL superblock incompatible or invalid
1021 * -othererror e.g. -EIO
1023 * int validate_super(struct mddev *mddev, struct md_rdev *dev)
1024 * Verify that dev is acceptable into mddev.
1025 * The first time, mddev->raid_disks will be 0, and data from
1026 * dev should be merged in. Subsequent calls check that dev
1027 * is new enough. Return 0 or -EINVAL
1029 * void sync_super(struct mddev *mddev, struct md_rdev *dev)
1030 * Update the superblock for rdev with data in mddev
1031 * This does not write to disc.
1037 struct module *owner;
1038 int (*load_super)(struct md_rdev *rdev, struct md_rdev *refdev,
1040 int (*validate_super)(struct mddev *mddev, struct md_rdev *rdev);
1041 void (*sync_super)(struct mddev *mddev, struct md_rdev *rdev);
1042 unsigned long long (*rdev_size_change)(struct md_rdev *rdev,
1043 sector_t num_sectors);
1047 * Check that the given mddev has no bitmap.
1049 * This function is called from the run method of all personalities that do not
1050 * support bitmaps. It prints an error message and returns non-zero if mddev
1051 * has a bitmap. Otherwise, it returns 0.
1054 int md_check_no_bitmap(struct mddev *mddev)
1056 if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset)
1058 printk(KERN_ERR "%s: bitmaps are not supported for %s\n",
1059 mdname(mddev), mddev->pers->name);
1062 EXPORT_SYMBOL(md_check_no_bitmap);
1065 * load_super for 0.90.0
1067 static int super_90_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
1069 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1074 * Calculate the position of the superblock (512byte sectors),
1075 * it's at the end of the disk.
1077 * It also happens to be a multiple of 4Kb.
1079 rdev->sb_start = calc_dev_sboffset(rdev);
1081 ret = read_disk_sb(rdev, MD_SB_BYTES);
1082 if (ret) return ret;
1086 bdevname(rdev->bdev, b);
1087 sb = page_address(rdev->sb_page);
1089 if (sb->md_magic != MD_SB_MAGIC) {
1090 printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
1095 if (sb->major_version != 0 ||
1096 sb->minor_version < 90 ||
1097 sb->minor_version > 91) {
1098 printk(KERN_WARNING "Bad version number %d.%d on %s\n",
1099 sb->major_version, sb->minor_version,
1104 if (sb->raid_disks <= 0)
1107 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
1108 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
1113 rdev->preferred_minor = sb->md_minor;
1114 rdev->data_offset = 0;
1115 rdev->sb_size = MD_SB_BYTES;
1116 rdev->badblocks.shift = -1;
1118 if (sb->level == LEVEL_MULTIPATH)
1121 rdev->desc_nr = sb->this_disk.number;
1127 mdp_super_t *refsb = page_address(refdev->sb_page);
1128 if (!uuid_equal(refsb, sb)) {
1129 printk(KERN_WARNING "md: %s has different UUID to %s\n",
1130 b, bdevname(refdev->bdev,b2));
1133 if (!sb_equal(refsb, sb)) {
1134 printk(KERN_WARNING "md: %s has same UUID"
1135 " but different superblock to %s\n",
1136 b, bdevname(refdev->bdev, b2));
1140 ev2 = md_event(refsb);
1146 rdev->sectors = rdev->sb_start;
1147 /* Limit to 4TB as metadata cannot record more than that */
1148 if (rdev->sectors >= (2ULL << 32))
1149 rdev->sectors = (2ULL << 32) - 2;
1151 if (rdev->sectors < ((sector_t)sb->size) * 2 && sb->level >= 1)
1152 /* "this cannot possibly happen" ... */
1160 * validate_super for 0.90.0
1162 static int super_90_validate(struct mddev *mddev, struct md_rdev *rdev)
1165 mdp_super_t *sb = page_address(rdev->sb_page);
1166 __u64 ev1 = md_event(sb);
1168 rdev->raid_disk = -1;
1169 clear_bit(Faulty, &rdev->flags);
1170 clear_bit(In_sync, &rdev->flags);
1171 clear_bit(WriteMostly, &rdev->flags);
1173 if (mddev->raid_disks == 0) {
1174 mddev->major_version = 0;
1175 mddev->minor_version = sb->minor_version;
1176 mddev->patch_version = sb->patch_version;
1177 mddev->external = 0;
1178 mddev->chunk_sectors = sb->chunk_size >> 9;
1179 mddev->ctime = sb->ctime;
1180 mddev->utime = sb->utime;
1181 mddev->level = sb->level;
1182 mddev->clevel[0] = 0;
1183 mddev->layout = sb->layout;
1184 mddev->raid_disks = sb->raid_disks;
1185 mddev->dev_sectors = ((sector_t)sb->size) * 2;
1186 mddev->events = ev1;
1187 mddev->bitmap_info.offset = 0;
1188 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
1190 if (mddev->minor_version >= 91) {
1191 mddev->reshape_position = sb->reshape_position;
1192 mddev->delta_disks = sb->delta_disks;
1193 mddev->new_level = sb->new_level;
1194 mddev->new_layout = sb->new_layout;
1195 mddev->new_chunk_sectors = sb->new_chunk >> 9;
1197 mddev->reshape_position = MaxSector;
1198 mddev->delta_disks = 0;
1199 mddev->new_level = mddev->level;
1200 mddev->new_layout = mddev->layout;
1201 mddev->new_chunk_sectors = mddev->chunk_sectors;
1204 if (sb->state & (1<<MD_SB_CLEAN))
1205 mddev->recovery_cp = MaxSector;
1207 if (sb->events_hi == sb->cp_events_hi &&
1208 sb->events_lo == sb->cp_events_lo) {
1209 mddev->recovery_cp = sb->recovery_cp;
1211 mddev->recovery_cp = 0;
1214 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
1215 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
1216 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
1217 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
1219 mddev->max_disks = MD_SB_DISKS;
1221 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
1222 mddev->bitmap_info.file == NULL)
1223 mddev->bitmap_info.offset =
1224 mddev->bitmap_info.default_offset;
1226 } else if (mddev->pers == NULL) {
1227 /* Insist on good event counter while assembling, except
1228 * for spares (which don't need an event count) */
1230 if (sb->disks[rdev->desc_nr].state & (
1231 (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE)))
1232 if (ev1 < mddev->events)
1234 } else if (mddev->bitmap) {
1235 /* if adding to array with a bitmap, then we can accept an
1236 * older device ... but not too old.
1238 if (ev1 < mddev->bitmap->events_cleared)
1241 if (ev1 < mddev->events)
1242 /* just a hot-add of a new device, leave raid_disk at -1 */
1246 if (mddev->level != LEVEL_MULTIPATH) {
1247 desc = sb->disks + rdev->desc_nr;
1249 if (desc->state & (1<<MD_DISK_FAULTY))
1250 set_bit(Faulty, &rdev->flags);
1251 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
1252 desc->raid_disk < mddev->raid_disks */) {
1253 set_bit(In_sync, &rdev->flags);
1254 rdev->raid_disk = desc->raid_disk;
1255 } else if (desc->state & (1<<MD_DISK_ACTIVE)) {
1256 /* active but not in sync implies recovery up to
1257 * reshape position. We don't know exactly where
1258 * that is, so set to zero for now */
1259 if (mddev->minor_version >= 91) {
1260 rdev->recovery_offset = 0;
1261 rdev->raid_disk = desc->raid_disk;
1264 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
1265 set_bit(WriteMostly, &rdev->flags);
1266 } else /* MULTIPATH are always insync */
1267 set_bit(In_sync, &rdev->flags);
1272 * sync_super for 0.90.0
1274 static void super_90_sync(struct mddev *mddev, struct md_rdev *rdev)
1277 struct md_rdev *rdev2;
1278 int next_spare = mddev->raid_disks;
1281 /* make rdev->sb match mddev data..
1284 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1285 * 3/ any empty disks < next_spare become removed
1287 * disks[0] gets initialised to REMOVED because
1288 * we cannot be sure from other fields if it has
1289 * been initialised or not.
1292 int active=0, working=0,failed=0,spare=0,nr_disks=0;
1294 rdev->sb_size = MD_SB_BYTES;
1296 sb = page_address(rdev->sb_page);
1298 memset(sb, 0, sizeof(*sb));
1300 sb->md_magic = MD_SB_MAGIC;
1301 sb->major_version = mddev->major_version;
1302 sb->patch_version = mddev->patch_version;
1303 sb->gvalid_words = 0; /* ignored */
1304 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
1305 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
1306 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
1307 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
1309 sb->ctime = mddev->ctime;
1310 sb->level = mddev->level;
1311 sb->size = mddev->dev_sectors / 2;
1312 sb->raid_disks = mddev->raid_disks;
1313 sb->md_minor = mddev->md_minor;
1314 sb->not_persistent = 0;
1315 sb->utime = mddev->utime;
1317 sb->events_hi = (mddev->events>>32);
1318 sb->events_lo = (u32)mddev->events;
1320 if (mddev->reshape_position == MaxSector)
1321 sb->minor_version = 90;
1323 sb->minor_version = 91;
1324 sb->reshape_position = mddev->reshape_position;
1325 sb->new_level = mddev->new_level;
1326 sb->delta_disks = mddev->delta_disks;
1327 sb->new_layout = mddev->new_layout;
1328 sb->new_chunk = mddev->new_chunk_sectors << 9;
1330 mddev->minor_version = sb->minor_version;
1333 sb->recovery_cp = mddev->recovery_cp;
1334 sb->cp_events_hi = (mddev->events>>32);
1335 sb->cp_events_lo = (u32)mddev->events;
1336 if (mddev->recovery_cp == MaxSector)
1337 sb->state = (1<< MD_SB_CLEAN);
1339 sb->recovery_cp = 0;
1341 sb->layout = mddev->layout;
1342 sb->chunk_size = mddev->chunk_sectors << 9;
1344 if (mddev->bitmap && mddev->bitmap_info.file == NULL)
1345 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
1347 sb->disks[0].state = (1<<MD_DISK_REMOVED);
1348 list_for_each_entry(rdev2, &mddev->disks, same_set) {
1351 int is_active = test_bit(In_sync, &rdev2->flags);
1353 if (rdev2->raid_disk >= 0 &&
1354 sb->minor_version >= 91)
1355 /* we have nowhere to store the recovery_offset,
1356 * but if it is not below the reshape_position,
1357 * we can piggy-back on that.
1360 if (rdev2->raid_disk < 0 ||
1361 test_bit(Faulty, &rdev2->flags))
1364 desc_nr = rdev2->raid_disk;
1366 desc_nr = next_spare++;
1367 rdev2->desc_nr = desc_nr;
1368 d = &sb->disks[rdev2->desc_nr];
1370 d->number = rdev2->desc_nr;
1371 d->major = MAJOR(rdev2->bdev->bd_dev);
1372 d->minor = MINOR(rdev2->bdev->bd_dev);
1374 d->raid_disk = rdev2->raid_disk;
1376 d->raid_disk = rdev2->desc_nr; /* compatibility */
1377 if (test_bit(Faulty, &rdev2->flags))
1378 d->state = (1<<MD_DISK_FAULTY);
1379 else if (is_active) {
1380 d->state = (1<<MD_DISK_ACTIVE);
1381 if (test_bit(In_sync, &rdev2->flags))
1382 d->state |= (1<<MD_DISK_SYNC);
1390 if (test_bit(WriteMostly, &rdev2->flags))
1391 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1393 /* now set the "removed" and "faulty" bits on any missing devices */
1394 for (i=0 ; i < mddev->raid_disks ; i++) {
1395 mdp_disk_t *d = &sb->disks[i];
1396 if (d->state == 0 && d->number == 0) {
1399 d->state = (1<<MD_DISK_REMOVED);
1400 d->state |= (1<<MD_DISK_FAULTY);
1404 sb->nr_disks = nr_disks;
1405 sb->active_disks = active;
1406 sb->working_disks = working;
1407 sb->failed_disks = failed;
1408 sb->spare_disks = spare;
1410 sb->this_disk = sb->disks[rdev->desc_nr];
1411 sb->sb_csum = calc_sb_csum(sb);
1415 * rdev_size_change for 0.90.0
1417 static unsigned long long
1418 super_90_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
1420 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1421 return 0; /* component must fit device */
1422 if (rdev->mddev->bitmap_info.offset)
1423 return 0; /* can't move bitmap */
1424 rdev->sb_start = calc_dev_sboffset(rdev);
1425 if (!num_sectors || num_sectors > rdev->sb_start)
1426 num_sectors = rdev->sb_start;
1427 /* Limit to 4TB as metadata cannot record more than that.
1428 * 4TB == 2^32 KB, or 2*2^32 sectors.
1430 if (num_sectors >= (2ULL << 32))
1431 num_sectors = (2ULL << 32) - 2;
1432 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1434 md_super_wait(rdev->mddev);
1440 * version 1 superblock
1443 static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb)
1447 unsigned long long newcsum;
1448 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1449 __le32 *isuper = (__le32*)sb;
1452 disk_csum = sb->sb_csum;
1455 for (i=0; size>=4; size -= 4 )
1456 newcsum += le32_to_cpu(*isuper++);
1459 newcsum += le16_to_cpu(*(__le16*) isuper);
1461 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1462 sb->sb_csum = disk_csum;
1463 return cpu_to_le32(csum);
1466 static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors,
1468 static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
1470 struct mdp_superblock_1 *sb;
1473 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1477 * Calculate the position of the superblock in 512byte sectors.
1478 * It is always aligned to a 4K boundary and
1479 * depeding on minor_version, it can be:
1480 * 0: At least 8K, but less than 12K, from end of device
1481 * 1: At start of device
1482 * 2: 4K from start of device.
1484 switch(minor_version) {
1486 sb_start = i_size_read(rdev->bdev->bd_inode) >> 9;
1488 sb_start &= ~(sector_t)(4*2-1);
1499 rdev->sb_start = sb_start;
1501 /* superblock is rarely larger than 1K, but it can be larger,
1502 * and it is safe to read 4k, so we do that
1504 ret = read_disk_sb(rdev, 4096);
1505 if (ret) return ret;
1508 sb = page_address(rdev->sb_page);
1510 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1511 sb->major_version != cpu_to_le32(1) ||
1512 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1513 le64_to_cpu(sb->super_offset) != rdev->sb_start ||
1514 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1517 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1518 printk("md: invalid superblock checksum on %s\n",
1519 bdevname(rdev->bdev,b));
1522 if (le64_to_cpu(sb->data_size) < 10) {
1523 printk("md: data_size too small on %s\n",
1524 bdevname(rdev->bdev,b));
1528 rdev->preferred_minor = 0xffff;
1529 rdev->data_offset = le64_to_cpu(sb->data_offset);
1530 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1532 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1533 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1534 if (rdev->sb_size & bmask)
1535 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1538 && rdev->data_offset < sb_start + (rdev->sb_size/512))
1541 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1544 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1546 if (!rdev->bb_page) {
1547 rdev->bb_page = alloc_page(GFP_KERNEL);
1551 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BAD_BLOCKS) &&
1552 rdev->badblocks.count == 0) {
1553 /* need to load the bad block list.
1554 * Currently we limit it to one page.
1560 int sectors = le16_to_cpu(sb->bblog_size);
1561 if (sectors > (PAGE_SIZE / 512))
1563 offset = le32_to_cpu(sb->bblog_offset);
1566 bb_sector = (long long)offset;
1567 if (!sync_page_io(rdev, bb_sector, sectors << 9,
1568 rdev->bb_page, READ, true))
1570 bbp = (u64 *)page_address(rdev->bb_page);
1571 rdev->badblocks.shift = sb->bblog_shift;
1572 for (i = 0 ; i < (sectors << (9-3)) ; i++, bbp++) {
1573 u64 bb = le64_to_cpu(*bbp);
1574 int count = bb & (0x3ff);
1575 u64 sector = bb >> 10;
1576 sector <<= sb->bblog_shift;
1577 count <<= sb->bblog_shift;
1580 if (md_set_badblocks(&rdev->badblocks,
1581 sector, count, 1) == 0)
1584 } else if (sb->bblog_offset == 0)
1585 rdev->badblocks.shift = -1;
1591 struct mdp_superblock_1 *refsb = page_address(refdev->sb_page);
1593 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1594 sb->level != refsb->level ||
1595 sb->layout != refsb->layout ||
1596 sb->chunksize != refsb->chunksize) {
1597 printk(KERN_WARNING "md: %s has strangely different"
1598 " superblock to %s\n",
1599 bdevname(rdev->bdev,b),
1600 bdevname(refdev->bdev,b2));
1603 ev1 = le64_to_cpu(sb->events);
1604 ev2 = le64_to_cpu(refsb->events);
1612 rdev->sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) -
1613 le64_to_cpu(sb->data_offset);
1615 rdev->sectors = rdev->sb_start;
1616 if (rdev->sectors < le64_to_cpu(sb->data_size))
1618 rdev->sectors = le64_to_cpu(sb->data_size);
1619 if (le64_to_cpu(sb->size) > rdev->sectors)
1624 static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev)
1626 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
1627 __u64 ev1 = le64_to_cpu(sb->events);
1629 rdev->raid_disk = -1;
1630 clear_bit(Faulty, &rdev->flags);
1631 clear_bit(In_sync, &rdev->flags);
1632 clear_bit(WriteMostly, &rdev->flags);
1634 if (mddev->raid_disks == 0) {
1635 mddev->major_version = 1;
1636 mddev->patch_version = 0;
1637 mddev->external = 0;
1638 mddev->chunk_sectors = le32_to_cpu(sb->chunksize);
1639 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1640 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1641 mddev->level = le32_to_cpu(sb->level);
1642 mddev->clevel[0] = 0;
1643 mddev->layout = le32_to_cpu(sb->layout);
1644 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1645 mddev->dev_sectors = le64_to_cpu(sb->size);
1646 mddev->events = ev1;
1647 mddev->bitmap_info.offset = 0;
1648 mddev->bitmap_info.default_offset = 1024 >> 9;
1650 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1651 memcpy(mddev->uuid, sb->set_uuid, 16);
1653 mddev->max_disks = (4096-256)/2;
1655 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1656 mddev->bitmap_info.file == NULL )
1657 mddev->bitmap_info.offset =
1658 (__s32)le32_to_cpu(sb->bitmap_offset);
1660 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1661 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1662 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1663 mddev->new_level = le32_to_cpu(sb->new_level);
1664 mddev->new_layout = le32_to_cpu(sb->new_layout);
1665 mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk);
1667 mddev->reshape_position = MaxSector;
1668 mddev->delta_disks = 0;
1669 mddev->new_level = mddev->level;
1670 mddev->new_layout = mddev->layout;
1671 mddev->new_chunk_sectors = mddev->chunk_sectors;
1674 } else if (mddev->pers == NULL) {
1675 /* Insist of good event counter while assembling, except for
1676 * spares (which don't need an event count) */
1678 if (rdev->desc_nr >= 0 &&
1679 rdev->desc_nr < le32_to_cpu(sb->max_dev) &&
1680 le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < 0xfffe)
1681 if (ev1 < mddev->events)
1683 } else if (mddev->bitmap) {
1684 /* If adding to array with a bitmap, then we can accept an
1685 * older device, but not too old.
1687 if (ev1 < mddev->bitmap->events_cleared)
1690 if (ev1 < mddev->events)
1691 /* just a hot-add of a new device, leave raid_disk at -1 */
1694 if (mddev->level != LEVEL_MULTIPATH) {
1696 if (rdev->desc_nr < 0 ||
1697 rdev->desc_nr >= le32_to_cpu(sb->max_dev)) {
1701 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1703 case 0xffff: /* spare */
1705 case 0xfffe: /* faulty */
1706 set_bit(Faulty, &rdev->flags);
1709 if ((le32_to_cpu(sb->feature_map) &
1710 MD_FEATURE_RECOVERY_OFFSET))
1711 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1713 set_bit(In_sync, &rdev->flags);
1714 rdev->raid_disk = role;
1717 if (sb->devflags & WriteMostly1)
1718 set_bit(WriteMostly, &rdev->flags);
1719 } else /* MULTIPATH are always insync */
1720 set_bit(In_sync, &rdev->flags);
1725 static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev)
1727 struct mdp_superblock_1 *sb;
1728 struct md_rdev *rdev2;
1730 /* make rdev->sb match mddev and rdev data. */
1732 sb = page_address(rdev->sb_page);
1734 sb->feature_map = 0;
1736 sb->recovery_offset = cpu_to_le64(0);
1737 memset(sb->pad1, 0, sizeof(sb->pad1));
1738 memset(sb->pad3, 0, sizeof(sb->pad3));
1740 sb->utime = cpu_to_le64((__u64)mddev->utime);
1741 sb->events = cpu_to_le64(mddev->events);
1743 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1745 sb->resync_offset = cpu_to_le64(0);
1747 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
1749 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
1750 sb->size = cpu_to_le64(mddev->dev_sectors);
1751 sb->chunksize = cpu_to_le32(mddev->chunk_sectors);
1752 sb->level = cpu_to_le32(mddev->level);
1753 sb->layout = cpu_to_le32(mddev->layout);
1755 if (test_bit(WriteMostly, &rdev->flags))
1756 sb->devflags |= WriteMostly1;
1758 sb->devflags &= ~WriteMostly1;
1760 if (mddev->bitmap && mddev->bitmap_info.file == NULL) {
1761 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset);
1762 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
1765 if (rdev->raid_disk >= 0 &&
1766 !test_bit(In_sync, &rdev->flags)) {
1768 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1769 sb->recovery_offset =
1770 cpu_to_le64(rdev->recovery_offset);
1773 if (mddev->reshape_position != MaxSector) {
1774 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1775 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1776 sb->new_layout = cpu_to_le32(mddev->new_layout);
1777 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1778 sb->new_level = cpu_to_le32(mddev->new_level);
1779 sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors);
1782 if (rdev->badblocks.count == 0)
1783 /* Nothing to do for bad blocks*/ ;
1784 else if (sb->bblog_offset == 0)
1785 /* Cannot record bad blocks on this device */
1786 md_error(mddev, rdev);
1788 struct badblocks *bb = &rdev->badblocks;
1789 u64 *bbp = (u64 *)page_address(rdev->bb_page);
1791 sb->feature_map |= cpu_to_le32(MD_FEATURE_BAD_BLOCKS);
1796 seq = read_seqbegin(&bb->lock);
1798 memset(bbp, 0xff, PAGE_SIZE);
1800 for (i = 0 ; i < bb->count ; i++) {
1801 u64 internal_bb = *p++;
1802 u64 store_bb = ((BB_OFFSET(internal_bb) << 10)
1803 | BB_LEN(internal_bb));
1804 *bbp++ = cpu_to_le64(store_bb);
1807 if (read_seqretry(&bb->lock, seq))
1810 bb->sector = (rdev->sb_start +
1811 (int)le32_to_cpu(sb->bblog_offset));
1812 bb->size = le16_to_cpu(sb->bblog_size);
1817 list_for_each_entry(rdev2, &mddev->disks, same_set)
1818 if (rdev2->desc_nr+1 > max_dev)
1819 max_dev = rdev2->desc_nr+1;
1821 if (max_dev > le32_to_cpu(sb->max_dev)) {
1823 sb->max_dev = cpu_to_le32(max_dev);
1824 rdev->sb_size = max_dev * 2 + 256;
1825 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1826 if (rdev->sb_size & bmask)
1827 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1829 max_dev = le32_to_cpu(sb->max_dev);
1831 for (i=0; i<max_dev;i++)
1832 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1834 list_for_each_entry(rdev2, &mddev->disks, same_set) {
1836 if (test_bit(Faulty, &rdev2->flags))
1837 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1838 else if (test_bit(In_sync, &rdev2->flags))
1839 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1840 else if (rdev2->raid_disk >= 0)
1841 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1843 sb->dev_roles[i] = cpu_to_le16(0xffff);
1846 sb->sb_csum = calc_sb_1_csum(sb);
1849 static unsigned long long
1850 super_1_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
1852 struct mdp_superblock_1 *sb;
1853 sector_t max_sectors;
1854 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1855 return 0; /* component must fit device */
1856 if (rdev->sb_start < rdev->data_offset) {
1857 /* minor versions 1 and 2; superblock before data */
1858 max_sectors = i_size_read(rdev->bdev->bd_inode) >> 9;
1859 max_sectors -= rdev->data_offset;
1860 if (!num_sectors || num_sectors > max_sectors)
1861 num_sectors = max_sectors;
1862 } else if (rdev->mddev->bitmap_info.offset) {
1863 /* minor version 0 with bitmap we can't move */
1866 /* minor version 0; superblock after data */
1868 sb_start = (i_size_read(rdev->bdev->bd_inode) >> 9) - 8*2;
1869 sb_start &= ~(sector_t)(4*2 - 1);
1870 max_sectors = rdev->sectors + sb_start - rdev->sb_start;
1871 if (!num_sectors || num_sectors > max_sectors)
1872 num_sectors = max_sectors;
1873 rdev->sb_start = sb_start;
1875 sb = page_address(rdev->sb_page);
1876 sb->data_size = cpu_to_le64(num_sectors);
1877 sb->super_offset = rdev->sb_start;
1878 sb->sb_csum = calc_sb_1_csum(sb);
1879 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1881 md_super_wait(rdev->mddev);
1885 static struct super_type super_types[] = {
1888 .owner = THIS_MODULE,
1889 .load_super = super_90_load,
1890 .validate_super = super_90_validate,
1891 .sync_super = super_90_sync,
1892 .rdev_size_change = super_90_rdev_size_change,
1896 .owner = THIS_MODULE,
1897 .load_super = super_1_load,
1898 .validate_super = super_1_validate,
1899 .sync_super = super_1_sync,
1900 .rdev_size_change = super_1_rdev_size_change,
1904 static void sync_super(struct mddev *mddev, struct md_rdev *rdev)
1906 if (mddev->sync_super) {
1907 mddev->sync_super(mddev, rdev);
1911 BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types));
1913 super_types[mddev->major_version].sync_super(mddev, rdev);
1916 static int match_mddev_units(struct mddev *mddev1, struct mddev *mddev2)
1918 struct md_rdev *rdev, *rdev2;
1921 rdev_for_each_rcu(rdev, mddev1)
1922 rdev_for_each_rcu(rdev2, mddev2)
1923 if (rdev->bdev->bd_contains ==
1924 rdev2->bdev->bd_contains) {
1932 static LIST_HEAD(pending_raid_disks);
1935 * Try to register data integrity profile for an mddev
1937 * This is called when an array is started and after a disk has been kicked
1938 * from the array. It only succeeds if all working and active component devices
1939 * are integrity capable with matching profiles.
1941 int md_integrity_register(struct mddev *mddev)
1943 struct md_rdev *rdev, *reference = NULL;
1945 if (list_empty(&mddev->disks))
1946 return 0; /* nothing to do */
1947 if (!mddev->gendisk || blk_get_integrity(mddev->gendisk))
1948 return 0; /* shouldn't register, or already is */
1949 list_for_each_entry(rdev, &mddev->disks, same_set) {
1950 /* skip spares and non-functional disks */
1951 if (test_bit(Faulty, &rdev->flags))
1953 if (rdev->raid_disk < 0)
1956 /* Use the first rdev as the reference */
1960 /* does this rdev's profile match the reference profile? */
1961 if (blk_integrity_compare(reference->bdev->bd_disk,
1962 rdev->bdev->bd_disk) < 0)
1965 if (!reference || !bdev_get_integrity(reference->bdev))
1968 * All component devices are integrity capable and have matching
1969 * profiles, register the common profile for the md device.
1971 if (blk_integrity_register(mddev->gendisk,
1972 bdev_get_integrity(reference->bdev)) != 0) {
1973 printk(KERN_ERR "md: failed to register integrity for %s\n",
1977 printk(KERN_NOTICE "md: data integrity enabled on %s\n", mdname(mddev));
1978 if (bioset_integrity_create(mddev->bio_set, BIO_POOL_SIZE)) {
1979 printk(KERN_ERR "md: failed to create integrity pool for %s\n",
1985 EXPORT_SYMBOL(md_integrity_register);
1987 /* Disable data integrity if non-capable/non-matching disk is being added */
1988 void md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev)
1990 struct blk_integrity *bi_rdev = bdev_get_integrity(rdev->bdev);
1991 struct blk_integrity *bi_mddev = blk_get_integrity(mddev->gendisk);
1993 if (!bi_mddev) /* nothing to do */
1995 if (rdev->raid_disk < 0) /* skip spares */
1997 if (bi_rdev && blk_integrity_compare(mddev->gendisk,
1998 rdev->bdev->bd_disk) >= 0)
2000 printk(KERN_NOTICE "disabling data integrity on %s\n", mdname(mddev));
2001 blk_integrity_unregister(mddev->gendisk);
2003 EXPORT_SYMBOL(md_integrity_add_rdev);
2005 static int bind_rdev_to_array(struct md_rdev * rdev, struct mddev * mddev)
2007 char b[BDEVNAME_SIZE];
2017 /* prevent duplicates */
2018 if (find_rdev(mddev, rdev->bdev->bd_dev))
2021 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2022 if (rdev->sectors && (mddev->dev_sectors == 0 ||
2023 rdev->sectors < mddev->dev_sectors)) {
2025 /* Cannot change size, so fail
2026 * If mddev->level <= 0, then we don't care
2027 * about aligning sizes (e.g. linear)
2029 if (mddev->level > 0)
2032 mddev->dev_sectors = rdev->sectors;
2035 /* Verify rdev->desc_nr is unique.
2036 * If it is -1, assign a free number, else
2037 * check number is not in use
2039 if (rdev->desc_nr < 0) {
2041 if (mddev->pers) choice = mddev->raid_disks;
2042 while (find_rdev_nr(mddev, choice))
2044 rdev->desc_nr = choice;
2046 if (find_rdev_nr(mddev, rdev->desc_nr))
2049 if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) {
2050 printk(KERN_WARNING "md: %s: array is limited to %d devices\n",
2051 mdname(mddev), mddev->max_disks);
2054 bdevname(rdev->bdev,b);
2055 while ( (s=strchr(b, '/')) != NULL)
2058 rdev->mddev = mddev;
2059 printk(KERN_INFO "md: bind<%s>\n", b);
2061 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
2064 ko = &part_to_dev(rdev->bdev->bd_part)->kobj;
2065 if (sysfs_create_link(&rdev->kobj, ko, "block"))
2066 /* failure here is OK */;
2067 rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state");
2069 list_add_rcu(&rdev->same_set, &mddev->disks);
2070 bd_link_disk_holder(rdev->bdev, mddev->gendisk);
2072 /* May as well allow recovery to be retried once */
2073 mddev->recovery_disabled++;
2078 printk(KERN_WARNING "md: failed to register dev-%s for %s\n",
2083 static void md_delayed_delete(struct work_struct *ws)
2085 struct md_rdev *rdev = container_of(ws, struct md_rdev, del_work);
2086 kobject_del(&rdev->kobj);
2087 kobject_put(&rdev->kobj);
2090 static void unbind_rdev_from_array(struct md_rdev * rdev)
2092 char b[BDEVNAME_SIZE];
2097 bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk);
2098 list_del_rcu(&rdev->same_set);
2099 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
2101 sysfs_remove_link(&rdev->kobj, "block");
2102 sysfs_put(rdev->sysfs_state);
2103 rdev->sysfs_state = NULL;
2104 kfree(rdev->badblocks.page);
2105 rdev->badblocks.count = 0;
2106 rdev->badblocks.page = NULL;
2107 /* We need to delay this, otherwise we can deadlock when
2108 * writing to 'remove' to "dev/state". We also need
2109 * to delay it due to rcu usage.
2112 INIT_WORK(&rdev->del_work, md_delayed_delete);
2113 kobject_get(&rdev->kobj);
2114 queue_work(md_misc_wq, &rdev->del_work);
2118 * prevent the device from being mounted, repartitioned or
2119 * otherwise reused by a RAID array (or any other kernel
2120 * subsystem), by bd_claiming the device.
2122 static int lock_rdev(struct md_rdev *rdev, dev_t dev, int shared)
2125 struct block_device *bdev;
2126 char b[BDEVNAME_SIZE];
2128 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
2129 shared ? (struct md_rdev *)lock_rdev : rdev);
2131 printk(KERN_ERR "md: could not open %s.\n",
2132 __bdevname(dev, b));
2133 return PTR_ERR(bdev);
2139 static void unlock_rdev(struct md_rdev *rdev)
2141 struct block_device *bdev = rdev->bdev;
2145 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
2148 void md_autodetect_dev(dev_t dev);
2150 static void export_rdev(struct md_rdev * rdev)
2152 char b[BDEVNAME_SIZE];
2153 printk(KERN_INFO "md: export_rdev(%s)\n",
2154 bdevname(rdev->bdev,b));
2159 if (test_bit(AutoDetected, &rdev->flags))
2160 md_autodetect_dev(rdev->bdev->bd_dev);
2163 kobject_put(&rdev->kobj);
2166 static void kick_rdev_from_array(struct md_rdev * rdev)
2168 unbind_rdev_from_array(rdev);
2172 static void export_array(struct mddev *mddev)
2174 struct md_rdev *rdev, *tmp;
2176 rdev_for_each(rdev, tmp, mddev) {
2181 kick_rdev_from_array(rdev);
2183 if (!list_empty(&mddev->disks))
2185 mddev->raid_disks = 0;
2186 mddev->major_version = 0;
2189 static void print_desc(mdp_disk_t *desc)
2191 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
2192 desc->major,desc->minor,desc->raid_disk,desc->state);
2195 static void print_sb_90(mdp_super_t *sb)
2200 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
2201 sb->major_version, sb->minor_version, sb->patch_version,
2202 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
2204 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
2205 sb->level, sb->size, sb->nr_disks, sb->raid_disks,
2206 sb->md_minor, sb->layout, sb->chunk_size);
2207 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
2208 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
2209 sb->utime, sb->state, sb->active_disks, sb->working_disks,
2210 sb->failed_disks, sb->spare_disks,
2211 sb->sb_csum, (unsigned long)sb->events_lo);
2214 for (i = 0; i < MD_SB_DISKS; i++) {
2217 desc = sb->disks + i;
2218 if (desc->number || desc->major || desc->minor ||
2219 desc->raid_disk || (desc->state && (desc->state != 4))) {
2220 printk(" D %2d: ", i);
2224 printk(KERN_INFO "md: THIS: ");
2225 print_desc(&sb->this_disk);
2228 static void print_sb_1(struct mdp_superblock_1 *sb)
2232 uuid = sb->set_uuid;
2234 "md: SB: (V:%u) (F:0x%08x) Array-ID:<%pU>\n"
2235 "md: Name: \"%s\" CT:%llu\n",
2236 le32_to_cpu(sb->major_version),
2237 le32_to_cpu(sb->feature_map),
2240 (unsigned long long)le64_to_cpu(sb->ctime)
2241 & MD_SUPERBLOCK_1_TIME_SEC_MASK);
2243 uuid = sb->device_uuid;
2245 "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu"
2247 "md: Dev:%08x UUID: %pU\n"
2248 "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n"
2249 "md: (MaxDev:%u) \n",
2250 le32_to_cpu(sb->level),
2251 (unsigned long long)le64_to_cpu(sb->size),
2252 le32_to_cpu(sb->raid_disks),
2253 le32_to_cpu(sb->layout),
2254 le32_to_cpu(sb->chunksize),
2255 (unsigned long long)le64_to_cpu(sb->data_offset),
2256 (unsigned long long)le64_to_cpu(sb->data_size),
2257 (unsigned long long)le64_to_cpu(sb->super_offset),
2258 (unsigned long long)le64_to_cpu(sb->recovery_offset),
2259 le32_to_cpu(sb->dev_number),
2262 (unsigned long long)le64_to_cpu(sb->utime) & MD_SUPERBLOCK_1_TIME_SEC_MASK,
2263 (unsigned long long)le64_to_cpu(sb->events),
2264 (unsigned long long)le64_to_cpu(sb->resync_offset),
2265 le32_to_cpu(sb->sb_csum),
2266 le32_to_cpu(sb->max_dev)
2270 static void print_rdev(struct md_rdev *rdev, int major_version)
2272 char b[BDEVNAME_SIZE];
2273 printk(KERN_INFO "md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n",
2274 bdevname(rdev->bdev, b), (unsigned long long)rdev->sectors,
2275 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
2277 if (rdev->sb_loaded) {
2278 printk(KERN_INFO "md: rdev superblock (MJ:%d):\n", major_version);
2279 switch (major_version) {
2281 print_sb_90(page_address(rdev->sb_page));
2284 print_sb_1(page_address(rdev->sb_page));
2288 printk(KERN_INFO "md: no rdev superblock!\n");
2291 static void md_print_devices(void)
2293 struct list_head *tmp;
2294 struct md_rdev *rdev;
2295 struct mddev *mddev;
2296 char b[BDEVNAME_SIZE];
2299 printk("md: **********************************\n");
2300 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
2301 printk("md: **********************************\n");
2302 for_each_mddev(mddev, tmp) {
2305 bitmap_print_sb(mddev->bitmap);
2307 printk("%s: ", mdname(mddev));
2308 list_for_each_entry(rdev, &mddev->disks, same_set)
2309 printk("<%s>", bdevname(rdev->bdev,b));
2312 list_for_each_entry(rdev, &mddev->disks, same_set)
2313 print_rdev(rdev, mddev->major_version);
2315 printk("md: **********************************\n");
2320 static void sync_sbs(struct mddev * mddev, int nospares)
2322 /* Update each superblock (in-memory image), but
2323 * if we are allowed to, skip spares which already
2324 * have the right event counter, or have one earlier
2325 * (which would mean they aren't being marked as dirty
2326 * with the rest of the array)
2328 struct md_rdev *rdev;
2329 list_for_each_entry(rdev, &mddev->disks, same_set) {
2330 if (rdev->sb_events == mddev->events ||
2332 rdev->raid_disk < 0 &&
2333 rdev->sb_events+1 == mddev->events)) {
2334 /* Don't update this superblock */
2335 rdev->sb_loaded = 2;
2337 sync_super(mddev, rdev);
2338 rdev->sb_loaded = 1;
2343 static void md_update_sb(struct mddev * mddev, int force_change)
2345 struct md_rdev *rdev;
2348 int any_badblocks_changed = 0;
2351 /* First make sure individual recovery_offsets are correct */
2352 list_for_each_entry(rdev, &mddev->disks, same_set) {
2353 if (rdev->raid_disk >= 0 &&
2354 mddev->delta_disks >= 0 &&
2355 !test_bit(In_sync, &rdev->flags) &&
2356 mddev->curr_resync_completed > rdev->recovery_offset)
2357 rdev->recovery_offset = mddev->curr_resync_completed;
2360 if (!mddev->persistent) {
2361 clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
2362 clear_bit(MD_CHANGE_DEVS, &mddev->flags);
2363 if (!mddev->external) {
2364 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2365 list_for_each_entry(rdev, &mddev->disks, same_set) {
2366 if (rdev->badblocks.changed) {
2367 rdev->badblocks.changed = 0;
2368 md_ack_all_badblocks(&rdev->badblocks);
2369 md_error(mddev, rdev);
2371 clear_bit(Blocked, &rdev->flags);
2372 clear_bit(BlockedBadBlocks, &rdev->flags);
2373 wake_up(&rdev->blocked_wait);
2376 wake_up(&mddev->sb_wait);
2380 spin_lock_irq(&mddev->write_lock);
2382 mddev->utime = get_seconds();
2384 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
2386 if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags))
2387 /* just a clean<-> dirty transition, possibly leave spares alone,
2388 * though if events isn't the right even/odd, we will have to do
2394 if (mddev->degraded)
2395 /* If the array is degraded, then skipping spares is both
2396 * dangerous and fairly pointless.
2397 * Dangerous because a device that was removed from the array
2398 * might have a event_count that still looks up-to-date,
2399 * so it can be re-added without a resync.
2400 * Pointless because if there are any spares to skip,
2401 * then a recovery will happen and soon that array won't
2402 * be degraded any more and the spare can go back to sleep then.
2406 sync_req = mddev->in_sync;
2408 /* If this is just a dirty<->clean transition, and the array is clean
2409 * and 'events' is odd, we can roll back to the previous clean state */
2411 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
2412 && mddev->can_decrease_events
2413 && mddev->events != 1) {
2415 mddev->can_decrease_events = 0;
2417 /* otherwise we have to go forward and ... */
2419 mddev->can_decrease_events = nospares;
2422 if (!mddev->events) {
2424 * oops, this 64-bit counter should never wrap.
2425 * Either we are in around ~1 trillion A.C., assuming
2426 * 1 reboot per second, or we have a bug:
2432 list_for_each_entry(rdev, &mddev->disks, same_set) {
2433 if (rdev->badblocks.changed)
2434 any_badblocks_changed++;
2435 if (test_bit(Faulty, &rdev->flags))
2436 set_bit(FaultRecorded, &rdev->flags);
2439 sync_sbs(mddev, nospares);
2440 spin_unlock_irq(&mddev->write_lock);
2442 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2443 mdname(mddev), mddev->in_sync);
2445 bitmap_update_sb(mddev->bitmap);
2446 list_for_each_entry(rdev, &mddev->disks, same_set) {
2447 char b[BDEVNAME_SIZE];
2449 if (rdev->sb_loaded != 1)
2450 continue; /* no noise on spare devices */
2452 if (!test_bit(Faulty, &rdev->flags) &&
2453 rdev->saved_raid_disk == -1) {
2454 md_super_write(mddev,rdev,
2455 rdev->sb_start, rdev->sb_size,
2457 pr_debug("md: (write) %s's sb offset: %llu\n",
2458 bdevname(rdev->bdev, b),
2459 (unsigned long long)rdev->sb_start);
2460 rdev->sb_events = mddev->events;
2461 if (rdev->badblocks.size) {
2462 md_super_write(mddev, rdev,
2463 rdev->badblocks.sector,
2464 rdev->badblocks.size << 9,
2466 rdev->badblocks.size = 0;
2469 } else if (test_bit(Faulty, &rdev->flags))
2470 pr_debug("md: %s (skipping faulty)\n",
2471 bdevname(rdev->bdev, b));
2473 pr_debug("(skipping incremental s/r ");
2475 if (mddev->level == LEVEL_MULTIPATH)
2476 /* only need to write one superblock... */
2479 md_super_wait(mddev);
2480 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2482 spin_lock_irq(&mddev->write_lock);
2483 if (mddev->in_sync != sync_req ||
2484 test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
2485 /* have to write it out again */
2486 spin_unlock_irq(&mddev->write_lock);
2489 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2490 spin_unlock_irq(&mddev->write_lock);
2491 wake_up(&mddev->sb_wait);
2492 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
2493 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
2495 list_for_each_entry(rdev, &mddev->disks, same_set) {
2496 if (test_and_clear_bit(FaultRecorded, &rdev->flags))
2497 clear_bit(Blocked, &rdev->flags);
2499 if (any_badblocks_changed)
2500 md_ack_all_badblocks(&rdev->badblocks);
2501 clear_bit(BlockedBadBlocks, &rdev->flags);
2502 wake_up(&rdev->blocked_wait);
2506 /* words written to sysfs files may, or may not, be \n terminated.
2507 * We want to accept with case. For this we use cmd_match.
2509 static int cmd_match(const char *cmd, const char *str)
2511 /* See if cmd, written into a sysfs file, matches
2512 * str. They must either be the same, or cmd can
2513 * have a trailing newline
2515 while (*cmd && *str && *cmd == *str) {
2526 struct rdev_sysfs_entry {
2527 struct attribute attr;
2528 ssize_t (*show)(struct md_rdev *, char *);
2529 ssize_t (*store)(struct md_rdev *, const char *, size_t);
2533 state_show(struct md_rdev *rdev, char *page)
2538 if (test_bit(Faulty, &rdev->flags) ||
2539 rdev->badblocks.unacked_exist) {
2540 len+= sprintf(page+len, "%sfaulty",sep);
2543 if (test_bit(In_sync, &rdev->flags)) {
2544 len += sprintf(page+len, "%sin_sync",sep);
2547 if (test_bit(WriteMostly, &rdev->flags)) {
2548 len += sprintf(page+len, "%swrite_mostly",sep);
2551 if (test_bit(Blocked, &rdev->flags) ||
2552 (rdev->badblocks.unacked_exist
2553 && !test_bit(Faulty, &rdev->flags))) {
2554 len += sprintf(page+len, "%sblocked", sep);
2557 if (!test_bit(Faulty, &rdev->flags) &&
2558 !test_bit(In_sync, &rdev->flags)) {
2559 len += sprintf(page+len, "%sspare", sep);
2562 if (test_bit(WriteErrorSeen, &rdev->flags)) {
2563 len += sprintf(page+len, "%swrite_error", sep);
2566 return len+sprintf(page+len, "\n");
2570 state_store(struct md_rdev *rdev, const char *buf, size_t len)
2573 * faulty - simulates an error
2574 * remove - disconnects the device
2575 * writemostly - sets write_mostly
2576 * -writemostly - clears write_mostly
2577 * blocked - sets the Blocked flags
2578 * -blocked - clears the Blocked and possibly simulates an error
2579 * insync - sets Insync providing device isn't active
2580 * write_error - sets WriteErrorSeen
2581 * -write_error - clears WriteErrorSeen
2584 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
2585 md_error(rdev->mddev, rdev);
2586 if (test_bit(Faulty, &rdev->flags))
2590 } else if (cmd_match(buf, "remove")) {
2591 if (rdev->raid_disk >= 0)
2594 struct mddev *mddev = rdev->mddev;
2595 kick_rdev_from_array(rdev);
2597 md_update_sb(mddev, 1);
2598 md_new_event(mddev);
2601 } else if (cmd_match(buf, "writemostly")) {
2602 set_bit(WriteMostly, &rdev->flags);
2604 } else if (cmd_match(buf, "-writemostly")) {
2605 clear_bit(WriteMostly, &rdev->flags);
2607 } else if (cmd_match(buf, "blocked")) {
2608 set_bit(Blocked, &rdev->flags);
2610 } else if (cmd_match(buf, "-blocked")) {
2611 if (!test_bit(Faulty, &rdev->flags) &&
2612 rdev->badblocks.unacked_exist) {
2613 /* metadata handler doesn't understand badblocks,
2614 * so we need to fail the device
2616 md_error(rdev->mddev, rdev);
2618 clear_bit(Blocked, &rdev->flags);
2619 clear_bit(BlockedBadBlocks, &rdev->flags);
2620 wake_up(&rdev->blocked_wait);
2621 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2622 md_wakeup_thread(rdev->mddev->thread);
2625 } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) {
2626 set_bit(In_sync, &rdev->flags);
2628 } else if (cmd_match(buf, "write_error")) {
2629 set_bit(WriteErrorSeen, &rdev->flags);
2631 } else if (cmd_match(buf, "-write_error")) {
2632 clear_bit(WriteErrorSeen, &rdev->flags);
2636 sysfs_notify_dirent_safe(rdev->sysfs_state);
2637 return err ? err : len;
2639 static struct rdev_sysfs_entry rdev_state =
2640 __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store);
2643 errors_show(struct md_rdev *rdev, char *page)
2645 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
2649 errors_store(struct md_rdev *rdev, const char *buf, size_t len)
2652 unsigned long n = simple_strtoul(buf, &e, 10);
2653 if (*buf && (*e == 0 || *e == '\n')) {
2654 atomic_set(&rdev->corrected_errors, n);
2659 static struct rdev_sysfs_entry rdev_errors =
2660 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
2663 slot_show(struct md_rdev *rdev, char *page)
2665 if (rdev->raid_disk < 0)
2666 return sprintf(page, "none\n");
2668 return sprintf(page, "%d\n", rdev->raid_disk);
2672 slot_store(struct md_rdev *rdev, const char *buf, size_t len)
2676 int slot = simple_strtoul(buf, &e, 10);
2677 if (strncmp(buf, "none", 4)==0)
2679 else if (e==buf || (*e && *e!= '\n'))
2681 if (rdev->mddev->pers && slot == -1) {
2682 /* Setting 'slot' on an active array requires also
2683 * updating the 'rd%d' link, and communicating
2684 * with the personality with ->hot_*_disk.
2685 * For now we only support removing
2686 * failed/spare devices. This normally happens automatically,
2687 * but not when the metadata is externally managed.
2689 if (rdev->raid_disk == -1)
2691 /* personality does all needed checks */
2692 if (rdev->mddev->pers->hot_remove_disk == NULL)
2694 err = rdev->mddev->pers->
2695 hot_remove_disk(rdev->mddev, rdev->raid_disk);
2698 sysfs_unlink_rdev(rdev->mddev, rdev);
2699 rdev->raid_disk = -1;
2700 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2701 md_wakeup_thread(rdev->mddev->thread);
2702 } else if (rdev->mddev->pers) {
2703 struct md_rdev *rdev2;
2704 /* Activating a spare .. or possibly reactivating
2705 * if we ever get bitmaps working here.
2708 if (rdev->raid_disk != -1)
2711 if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery))
2714 if (rdev->mddev->pers->hot_add_disk == NULL)
2717 list_for_each_entry(rdev2, &rdev->mddev->disks, same_set)
2718 if (rdev2->raid_disk == slot)
2721 if (slot >= rdev->mddev->raid_disks &&
2722 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
2725 rdev->raid_disk = slot;
2726 if (test_bit(In_sync, &rdev->flags))
2727 rdev->saved_raid_disk = slot;
2729 rdev->saved_raid_disk = -1;
2730 clear_bit(In_sync, &rdev->flags);
2731 err = rdev->mddev->pers->
2732 hot_add_disk(rdev->mddev, rdev);
2734 rdev->raid_disk = -1;
2737 sysfs_notify_dirent_safe(rdev->sysfs_state);
2738 if (sysfs_link_rdev(rdev->mddev, rdev))
2739 /* failure here is OK */;
2740 /* don't wakeup anyone, leave that to userspace. */
2742 if (slot >= rdev->mddev->raid_disks &&
2743 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
2745 rdev->raid_disk = slot;
2746 /* assume it is working */
2747 clear_bit(Faulty, &rdev->flags);
2748 clear_bit(WriteMostly, &rdev->flags);
2749 set_bit(In_sync, &rdev->flags);
2750 sysfs_notify_dirent_safe(rdev->sysfs_state);
2756 static struct rdev_sysfs_entry rdev_slot =
2757 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
2760 offset_show(struct md_rdev *rdev, char *page)
2762 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
2766 offset_store(struct md_rdev *rdev, const char *buf, size_t len)
2769 unsigned long long offset = simple_strtoull(buf, &e, 10);
2770 if (e==buf || (*e && *e != '\n'))
2772 if (rdev->mddev->pers && rdev->raid_disk >= 0)
2774 if (rdev->sectors && rdev->mddev->external)
2775 /* Must set offset before size, so overlap checks
2778 rdev->data_offset = offset;
2782 static struct rdev_sysfs_entry rdev_offset =
2783 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
2786 rdev_size_show(struct md_rdev *rdev, char *page)
2788 return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2);
2791 static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
2793 /* check if two start/length pairs overlap */
2801 static int strict_blocks_to_sectors(const char *buf, sector_t *sectors)
2803 unsigned long long blocks;
2806 if (strict_strtoull(buf, 10, &blocks) < 0)
2809 if (blocks & 1ULL << (8 * sizeof(blocks) - 1))
2810 return -EINVAL; /* sector conversion overflow */
2813 if (new != blocks * 2)
2814 return -EINVAL; /* unsigned long long to sector_t overflow */
2821 rdev_size_store(struct md_rdev *rdev, const char *buf, size_t len)
2823 struct mddev *my_mddev = rdev->mddev;
2824 sector_t oldsectors = rdev->sectors;
2827 if (strict_blocks_to_sectors(buf, §ors) < 0)
2829 if (my_mddev->pers && rdev->raid_disk >= 0) {
2830 if (my_mddev->persistent) {
2831 sectors = super_types[my_mddev->major_version].
2832 rdev_size_change(rdev, sectors);
2835 } else if (!sectors)
2836 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) -
2839 if (sectors < my_mddev->dev_sectors)
2840 return -EINVAL; /* component must fit device */
2842 rdev->sectors = sectors;
2843 if (sectors > oldsectors && my_mddev->external) {
2844 /* need to check that all other rdevs with the same ->bdev
2845 * do not overlap. We need to unlock the mddev to avoid
2846 * a deadlock. We have already changed rdev->sectors, and if
2847 * we have to change it back, we will have the lock again.
2849 struct mddev *mddev;
2851 struct list_head *tmp;
2853 mddev_unlock(my_mddev);
2854 for_each_mddev(mddev, tmp) {
2855 struct md_rdev *rdev2;
2858 list_for_each_entry(rdev2, &mddev->disks, same_set)
2859 if (rdev->bdev == rdev2->bdev &&
2861 overlaps(rdev->data_offset, rdev->sectors,
2867 mddev_unlock(mddev);
2873 mddev_lock(my_mddev);
2875 /* Someone else could have slipped in a size
2876 * change here, but doing so is just silly.
2877 * We put oldsectors back because we *know* it is
2878 * safe, and trust userspace not to race with
2881 rdev->sectors = oldsectors;
2888 static struct rdev_sysfs_entry rdev_size =
2889 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
2892 static ssize_t recovery_start_show(struct md_rdev *rdev, char *page)
2894 unsigned long long recovery_start = rdev->recovery_offset;
2896 if (test_bit(In_sync, &rdev->flags) ||
2897 recovery_start == MaxSector)
2898 return sprintf(page, "none\n");
2900 return sprintf(page, "%llu\n", recovery_start);
2903 static ssize_t recovery_start_store(struct md_rdev *rdev, const char *buf, size_t len)
2905 unsigned long long recovery_start;
2907 if (cmd_match(buf, "none"))
2908 recovery_start = MaxSector;
2909 else if (strict_strtoull(buf, 10, &recovery_start))
2912 if (rdev->mddev->pers &&
2913 rdev->raid_disk >= 0)
2916 rdev->recovery_offset = recovery_start;
2917 if (recovery_start == MaxSector)
2918 set_bit(In_sync, &rdev->flags);
2920 clear_bit(In_sync, &rdev->flags);
2924 static struct rdev_sysfs_entry rdev_recovery_start =
2925 __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store);
2929 badblocks_show(struct badblocks *bb, char *page, int unack);
2931 badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack);
2933 static ssize_t bb_show(struct md_rdev *rdev, char *page)
2935 return badblocks_show(&rdev->badblocks, page, 0);
2937 static ssize_t bb_store(struct md_rdev *rdev, const char *page, size_t len)
2939 int rv = badblocks_store(&rdev->badblocks, page, len, 0);
2940 /* Maybe that ack was all we needed */
2941 if (test_and_clear_bit(BlockedBadBlocks, &rdev->flags))
2942 wake_up(&rdev->blocked_wait);
2945 static struct rdev_sysfs_entry rdev_bad_blocks =
2946 __ATTR(bad_blocks, S_IRUGO|S_IWUSR, bb_show, bb_store);
2949 static ssize_t ubb_show(struct md_rdev *rdev, char *page)
2951 return badblocks_show(&rdev->badblocks, page, 1);
2953 static ssize_t ubb_store(struct md_rdev *rdev, const char *page, size_t len)
2955 return badblocks_store(&rdev->badblocks, page, len, 1);
2957 static struct rdev_sysfs_entry rdev_unack_bad_blocks =
2958 __ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store);
2960 static struct attribute *rdev_default_attrs[] = {
2966 &rdev_recovery_start.attr,
2967 &rdev_bad_blocks.attr,
2968 &rdev_unack_bad_blocks.attr,
2972 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
2974 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2975 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
2976 struct mddev *mddev = rdev->mddev;
2982 rv = mddev ? mddev_lock(mddev) : -EBUSY;
2984 if (rdev->mddev == NULL)
2987 rv = entry->show(rdev, page);
2988 mddev_unlock(mddev);
2994 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
2995 const char *page, size_t length)
2997 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2998 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3000 struct mddev *mddev = rdev->mddev;
3004 if (!capable(CAP_SYS_ADMIN))
3006 rv = mddev ? mddev_lock(mddev): -EBUSY;
3008 if (rdev->mddev == NULL)
3011 rv = entry->store(rdev, page, length);
3012 mddev_unlock(mddev);
3017 static void rdev_free(struct kobject *ko)
3019 struct md_rdev *rdev = container_of(ko, struct md_rdev, kobj);
3022 static const struct sysfs_ops rdev_sysfs_ops = {
3023 .show = rdev_attr_show,
3024 .store = rdev_attr_store,
3026 static struct kobj_type rdev_ktype = {
3027 .release = rdev_free,
3028 .sysfs_ops = &rdev_sysfs_ops,
3029 .default_attrs = rdev_default_attrs,
3032 int md_rdev_init(struct md_rdev *rdev)
3035 rdev->saved_raid_disk = -1;
3036 rdev->raid_disk = -1;
3038 rdev->data_offset = 0;
3039 rdev->sb_events = 0;
3040 rdev->last_read_error.tv_sec = 0;
3041 rdev->last_read_error.tv_nsec = 0;
3042 rdev->sb_loaded = 0;
3043 rdev->bb_page = NULL;
3044 atomic_set(&rdev->nr_pending, 0);
3045 atomic_set(&rdev->read_errors, 0);
3046 atomic_set(&rdev->corrected_errors, 0);
3048 INIT_LIST_HEAD(&rdev->same_set);
3049 init_waitqueue_head(&rdev->blocked_wait);
3051 /* Add space to store bad block list.
3052 * This reserves the space even on arrays where it cannot
3053 * be used - I wonder if that matters
3055 rdev->badblocks.count = 0;
3056 rdev->badblocks.shift = 0;
3057 rdev->badblocks.page = kmalloc(PAGE_SIZE, GFP_KERNEL);
3058 seqlock_init(&rdev->badblocks.lock);
3059 if (rdev->badblocks.page == NULL)
3064 EXPORT_SYMBOL_GPL(md_rdev_init);
3066 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3068 * mark the device faulty if:
3070 * - the device is nonexistent (zero size)
3071 * - the device has no valid superblock
3073 * a faulty rdev _never_ has rdev->sb set.
3075 static struct md_rdev *md_import_device(dev_t newdev, int super_format, int super_minor)
3077 char b[BDEVNAME_SIZE];
3079 struct md_rdev *rdev;
3082 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
3084 printk(KERN_ERR "md: could not alloc mem for new device!\n");
3085 return ERR_PTR(-ENOMEM);
3088 err = md_rdev_init(rdev);
3091 err = alloc_disk_sb(rdev);
3095 err = lock_rdev(rdev, newdev, super_format == -2);
3099 kobject_init(&rdev->kobj, &rdev_ktype);
3101 size = i_size_read(rdev->bdev->bd_inode) >> BLOCK_SIZE_BITS;
3104 "md: %s has zero or unknown size, marking faulty!\n",
3105 bdevname(rdev->bdev,b));
3110 if (super_format >= 0) {
3111 err = super_types[super_format].
3112 load_super(rdev, NULL, super_minor);
3113 if (err == -EINVAL) {
3115 "md: %s does not have a valid v%d.%d "
3116 "superblock, not importing!\n",
3117 bdevname(rdev->bdev,b),
3118 super_format, super_minor);
3123 "md: could not read %s's sb, not importing!\n",
3124 bdevname(rdev->bdev,b));
3128 if (super_format == -1)
3129 /* hot-add for 0.90, or non-persistent: so no badblocks */
3130 rdev->badblocks.shift = -1;
3138 kfree(rdev->badblocks.page);
3140 return ERR_PTR(err);
3144 * Check a full RAID array for plausibility
3148 static void analyze_sbs(struct mddev * mddev)
3151 struct md_rdev *rdev, *freshest, *tmp;
3152 char b[BDEVNAME_SIZE];
3155 rdev_for_each(rdev, tmp, mddev)
3156 switch (super_types[mddev->major_version].
3157 load_super(rdev, freshest, mddev->minor_version)) {
3165 "md: fatal superblock inconsistency in %s"
3166 " -- removing from array\n",
3167 bdevname(rdev->bdev,b));
3168 kick_rdev_from_array(rdev);
3172 super_types[mddev->major_version].
3173 validate_super(mddev, freshest);
3176 rdev_for_each(rdev, tmp, mddev) {
3177 if (mddev->max_disks &&
3178 (rdev->desc_nr >= mddev->max_disks ||
3179 i > mddev->max_disks)) {
3181 "md: %s: %s: only %d devices permitted\n",
3182 mdname(mddev), bdevname(rdev->bdev, b),
3184 kick_rdev_from_array(rdev);
3187 if (rdev != freshest)
3188 if (super_types[mddev->major_version].
3189 validate_super(mddev, rdev)) {
3190 printk(KERN_WARNING "md: kicking non-fresh %s"
3192 bdevname(rdev->bdev,b));
3193 kick_rdev_from_array(rdev);
3196 if (mddev->level == LEVEL_MULTIPATH) {
3197 rdev->desc_nr = i++;
3198 rdev->raid_disk = rdev->desc_nr;
3199 set_bit(In_sync, &rdev->flags);
3200 } else if (rdev->raid_disk >= (mddev->raid_disks - min(0, mddev->delta_disks))) {
3201 rdev->raid_disk = -1;
3202 clear_bit(In_sync, &rdev->flags);
3207 /* Read a fixed-point number.
3208 * Numbers in sysfs attributes should be in "standard" units where
3209 * possible, so time should be in seconds.
3210 * However we internally use a a much smaller unit such as
3211 * milliseconds or jiffies.
3212 * This function takes a decimal number with a possible fractional
3213 * component, and produces an integer which is the result of
3214 * multiplying that number by 10^'scale'.
3215 * all without any floating-point arithmetic.
3217 int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale)
3219 unsigned long result = 0;
3221 while (isdigit(*cp) || (*cp == '.' && decimals < 0)) {
3224 else if (decimals < scale) {
3227 result = result * 10 + value;
3239 while (decimals < scale) {
3248 static void md_safemode_timeout(unsigned long data);
3251 safe_delay_show(struct mddev *mddev, char *page)
3253 int msec = (mddev->safemode_delay*1000)/HZ;
3254 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
3257 safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len)
3261 if (strict_strtoul_scaled(cbuf, &msec, 3) < 0)
3264 mddev->safemode_delay = 0;
3266 unsigned long old_delay = mddev->safemode_delay;
3267 mddev->safemode_delay = (msec*HZ)/1000;
3268 if (mddev->safemode_delay == 0)
3269 mddev->safemode_delay = 1;
3270 if (mddev->safemode_delay < old_delay)
3271 md_safemode_timeout((unsigned long)mddev);
3275 static struct md_sysfs_entry md_safe_delay =
3276 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
3279 level_show(struct mddev *mddev, char *page)
3281 struct md_personality *p = mddev->pers;
3283 return sprintf(page, "%s\n", p->name);
3284 else if (mddev->clevel[0])
3285 return sprintf(page, "%s\n", mddev->clevel);
3286 else if (mddev->level != LEVEL_NONE)
3287 return sprintf(page, "%d\n", mddev->level);
3293 level_store(struct mddev *mddev, const char *buf, size_t len)
3297 struct md_personality *pers;
3300 struct md_rdev *rdev;
3302 if (mddev->pers == NULL) {
3305 if (len >= sizeof(mddev->clevel))
3307 strncpy(mddev->clevel, buf, len);
3308 if (mddev->clevel[len-1] == '\n')
3310 mddev->clevel[len] = 0;
3311 mddev->level = LEVEL_NONE;
3315 /* request to change the personality. Need to ensure:
3316 * - array is not engaged in resync/recovery/reshape
3317 * - old personality can be suspended
3318 * - new personality will access other array.
3321 if (mddev->sync_thread ||
3322 mddev->reshape_position != MaxSector ||
3323 mddev->sysfs_active)
3326 if (!mddev->pers->quiesce) {
3327 printk(KERN_WARNING "md: %s: %s does not support online personality change\n",
3328 mdname(mddev), mddev->pers->name);
3332 /* Now find the new personality */
3333 if (len == 0 || len >= sizeof(clevel))
3335 strncpy(clevel, buf, len);
3336 if (clevel[len-1] == '\n')
3339 if (strict_strtol(clevel, 10, &level))
3342 if (request_module("md-%s", clevel) != 0)
3343 request_module("md-level-%s", clevel);
3344 spin_lock(&pers_lock);
3345 pers = find_pers(level, clevel);
3346 if (!pers || !try_module_get(pers->owner)) {
3347 spin_unlock(&pers_lock);
3348 printk(KERN_WARNING "md: personality %s not loaded\n", clevel);
3351 spin_unlock(&pers_lock);
3353 if (pers == mddev->pers) {
3354 /* Nothing to do! */
3355 module_put(pers->owner);
3358 if (!pers->takeover) {
3359 module_put(pers->owner);
3360 printk(KERN_WARNING "md: %s: %s does not support personality takeover\n",
3361 mdname(mddev), clevel);
3365 list_for_each_entry(rdev, &mddev->disks, same_set)
3366 rdev->new_raid_disk = rdev->raid_disk;
3368 /* ->takeover must set new_* and/or delta_disks
3369 * if it succeeds, and may set them when it fails.
3371 priv = pers->takeover(mddev);
3373 mddev->new_level = mddev->level;
3374 mddev->new_layout = mddev->layout;
3375 mddev->new_chunk_sectors = mddev->chunk_sectors;
3376 mddev->raid_disks -= mddev->delta_disks;
3377 mddev->delta_disks = 0;
3378 module_put(pers->owner);
3379 printk(KERN_WARNING "md: %s: %s would not accept array\n",
3380 mdname(mddev), clevel);
3381 return PTR_ERR(priv);
3384 /* Looks like we have a winner */
3385 mddev_suspend(mddev);
3386 mddev->pers->stop(mddev);
3388 if (mddev->pers->sync_request == NULL &&
3389 pers->sync_request != NULL) {
3390 /* need to add the md_redundancy_group */
3391 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
3393 "md: cannot register extra attributes for %s\n",
3395 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, NULL, "sync_action");
3397 if (mddev->pers->sync_request != NULL &&
3398 pers->sync_request == NULL) {
3399 /* need to remove the md_redundancy_group */
3400 if (mddev->to_remove == NULL)
3401 mddev->to_remove = &md_redundancy_group;
3404 if (mddev->pers->sync_request == NULL &&
3406 /* We are converting from a no-redundancy array
3407 * to a redundancy array and metadata is managed
3408 * externally so we need to be sure that writes
3409 * won't block due to a need to transition
3411 * until external management is started.
3414 mddev->safemode_delay = 0;
3415 mddev->safemode = 0;
3418 list_for_each_entry(rdev, &mddev->disks, same_set) {
3419 if (rdev->raid_disk < 0)
3421 if (rdev->new_raid_disk >= mddev->raid_disks)
3422 rdev->new_raid_disk = -1;
3423 if (rdev->new_raid_disk == rdev->raid_disk)
3425 sysfs_unlink_rdev(mddev, rdev);
3427 list_for_each_entry(rdev, &mddev->disks, same_set) {
3428 if (rdev->raid_disk < 0)
3430 if (rdev->new_raid_disk == rdev->raid_disk)
3432 rdev->raid_disk = rdev->new_raid_disk;
3433 if (rdev->raid_disk < 0)
3434 clear_bit(In_sync, &rdev->flags);
3436 if (sysfs_link_rdev(mddev, rdev))
3437 printk(KERN_WARNING "md: cannot register rd%d"
3438 " for %s after level change\n",
3439 rdev->raid_disk, mdname(mddev));
3443 module_put(mddev->pers->owner);
3445 mddev->private = priv;
3446 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
3447 mddev->level = mddev->new_level;
3448 mddev->layout = mddev->new_layout;
3449 mddev->chunk_sectors = mddev->new_chunk_sectors;
3450 mddev->delta_disks = 0;
3451 mddev->degraded = 0;
3452 if (mddev->pers->sync_request == NULL) {
3453 /* this is now an array without redundancy, so
3454 * it must always be in_sync
3457 del_timer_sync(&mddev->safemode_timer);
3460 mddev_resume(mddev);
3461 set_bit(MD_CHANGE_DEVS, &mddev->flags);
3462 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3463 md_wakeup_thread(mddev->thread);
3464 sysfs_notify(&mddev->kobj, NULL, "level");
3465 md_new_event(mddev);
3469 static struct md_sysfs_entry md_level =
3470 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
3474 layout_show(struct mddev *mddev, char *page)
3476 /* just a number, not meaningful for all levels */
3477 if (mddev->reshape_position != MaxSector &&
3478 mddev->layout != mddev->new_layout)
3479 return sprintf(page, "%d (%d)\n",
3480 mddev->new_layout, mddev->layout);
3481 return sprintf(page, "%d\n", mddev->layout);
3485 layout_store(struct mddev *mddev, const char *buf, size_t len)
3488 unsigned long n = simple_strtoul(buf, &e, 10);
3490 if (!*buf || (*e && *e != '\n'))
3495 if (mddev->pers->check_reshape == NULL)
3497 mddev->new_layout = n;
3498 err = mddev->pers->check_reshape(mddev);
3500 mddev->new_layout = mddev->layout;
3504 mddev->new_layout = n;
3505 if (mddev->reshape_position == MaxSector)
3510 static struct md_sysfs_entry md_layout =
3511 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
3515 raid_disks_show(struct mddev *mddev, char *page)
3517 if (mddev->raid_disks == 0)
3519 if (mddev->reshape_position != MaxSector &&
3520 mddev->delta_disks != 0)
3521 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
3522 mddev->raid_disks - mddev->delta_disks);
3523 return sprintf(page, "%d\n", mddev->raid_disks);
3526 static int update_raid_disks(struct mddev *mddev, int raid_disks);
3529 raid_disks_store(struct mddev *mddev, const char *buf, size_t len)
3533 unsigned long n = simple_strtoul(buf, &e, 10);
3535 if (!*buf || (*e && *e != '\n'))
3539 rv = update_raid_disks(mddev, n);
3540 else if (mddev->reshape_position != MaxSector) {
3541 int olddisks = mddev->raid_disks - mddev->delta_disks;
3542 mddev->delta_disks = n - olddisks;
3543 mddev->raid_disks = n;
3545 mddev->raid_disks = n;
3546 return rv ? rv : len;
3548 static struct md_sysfs_entry md_raid_disks =
3549 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
3552 chunk_size_show(struct mddev *mddev, char *page)
3554 if (mddev->reshape_position != MaxSector &&
3555 mddev->chunk_sectors != mddev->new_chunk_sectors)
3556 return sprintf(page, "%d (%d)\n",
3557 mddev->new_chunk_sectors << 9,
3558 mddev->chunk_sectors << 9);
3559 return sprintf(page, "%d\n", mddev->chunk_sectors << 9);
3563 chunk_size_store(struct mddev *mddev, const char *buf, size_t len)
3566 unsigned long n = simple_strtoul(buf, &e, 10);
3568 if (!*buf || (*e && *e != '\n'))
3573 if (mddev->pers->check_reshape == NULL)
3575 mddev->new_chunk_sectors = n >> 9;
3576 err = mddev->pers->check_reshape(mddev);
3578 mddev->new_chunk_sectors = mddev->chunk_sectors;
3582 mddev->new_chunk_sectors = n >> 9;
3583 if (mddev->reshape_position == MaxSector)
3584 mddev->chunk_sectors = n >> 9;
3588 static struct md_sysfs_entry md_chunk_size =
3589 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
3592 resync_start_show(struct mddev *mddev, char *page)
3594 if (mddev->recovery_cp == MaxSector)
3595 return sprintf(page, "none\n");
3596 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
3600 resync_start_store(struct mddev *mddev, const char *buf, size_t len)
3603 unsigned long long n = simple_strtoull(buf, &e, 10);
3605 if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
3607 if (cmd_match(buf, "none"))
3609 else if (!*buf || (*e && *e != '\n'))
3612 mddev->recovery_cp = n;
3615 static struct md_sysfs_entry md_resync_start =
3616 __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store);
3619 * The array state can be:
3622 * No devices, no size, no level
3623 * Equivalent to STOP_ARRAY ioctl
3625 * May have some settings, but array is not active
3626 * all IO results in error
3627 * When written, doesn't tear down array, but just stops it
3628 * suspended (not supported yet)
3629 * All IO requests will block. The array can be reconfigured.
3630 * Writing this, if accepted, will block until array is quiescent
3632 * no resync can happen. no superblocks get written.
3633 * write requests fail
3635 * like readonly, but behaves like 'clean' on a write request.
3637 * clean - no pending writes, but otherwise active.
3638 * When written to inactive array, starts without resync
3639 * If a write request arrives then
3640 * if metadata is known, mark 'dirty' and switch to 'active'.
3641 * if not known, block and switch to write-pending
3642 * If written to an active array that has pending writes, then fails.
3644 * fully active: IO and resync can be happening.
3645 * When written to inactive array, starts with resync
3648 * clean, but writes are blocked waiting for 'active' to be written.
3651 * like active, but no writes have been seen for a while (100msec).
3654 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
3655 write_pending, active_idle, bad_word};
3656 static char *array_states[] = {
3657 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3658 "write-pending", "active-idle", NULL };
3660 static int match_word(const char *word, char **list)
3663 for (n=0; list[n]; n++)
3664 if (cmd_match(word, list[n]))
3670 array_state_show(struct mddev *mddev, char *page)
3672 enum array_state st = inactive;
3685 else if (test_bit(MD_CHANGE_PENDING, &mddev->flags))
3687 else if (mddev->safemode)
3693 if (list_empty(&mddev->disks) &&
3694 mddev->raid_disks == 0 &&
3695 mddev->dev_sectors == 0)
3700 return sprintf(page, "%s\n", array_states[st]);
3703 static int do_md_stop(struct mddev * mddev, int ro, int is_open);
3704 static int md_set_readonly(struct mddev * mddev, int is_open);
3705 static int do_md_run(struct mddev * mddev);
3706 static int restart_array(struct mddev *mddev);
3709 array_state_store(struct mddev *mddev, const char *buf, size_t len)
3712 enum array_state st = match_word(buf, array_states);
3717 /* stopping an active array */
3718 if (atomic_read(&mddev->openers) > 0)
3720 err = do_md_stop(mddev, 0, 0);
3723 /* stopping an active array */
3725 if (atomic_read(&mddev->openers) > 0)
3727 err = do_md_stop(mddev, 2, 0);
3729 err = 0; /* already inactive */
3732 break; /* not supported yet */
3735 err = md_set_readonly(mddev, 0);
3738 set_disk_ro(mddev->gendisk, 1);
3739 err = do_md_run(mddev);
3745 err = md_set_readonly(mddev, 0);
3746 else if (mddev->ro == 1)
3747 err = restart_array(mddev);
3750 set_disk_ro(mddev->gendisk, 0);
3754 err = do_md_run(mddev);
3759 restart_array(mddev);
3760 spin_lock_irq(&mddev->write_lock);
3761 if (atomic_read(&mddev->writes_pending) == 0) {
3762 if (mddev->in_sync == 0) {
3764 if (mddev->safemode == 1)
3765 mddev->safemode = 0;
3766 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
3771 spin_unlock_irq(&mddev->write_lock);
3777 restart_array(mddev);
3778 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
3779 wake_up(&mddev->sb_wait);
3783 set_disk_ro(mddev->gendisk, 0);
3784 err = do_md_run(mddev);
3789 /* these cannot be set */
3795 if (mddev->hold_active == UNTIL_IOCTL)
3796 mddev->hold_active = 0;
3797 sysfs_notify_dirent_safe(mddev->sysfs_state);
3801 static struct md_sysfs_entry md_array_state =
3802 __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
3805 max_corrected_read_errors_show(struct mddev *mddev, char *page) {
3806 return sprintf(page, "%d\n",
3807 atomic_read(&mddev->max_corr_read_errors));
3811 max_corrected_read_errors_store(struct mddev *mddev, const char *buf, size_t len)
3814 unsigned long n = simple_strtoul(buf, &e, 10);
3816 if (*buf && (*e == 0 || *e == '\n')) {
3817 atomic_set(&mddev->max_corr_read_errors, n);
3823 static struct md_sysfs_entry max_corr_read_errors =
3824 __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show,
3825 max_corrected_read_errors_store);
3828 null_show(struct mddev *mddev, char *page)
3834 new_dev_store(struct mddev *mddev, const char *buf, size_t len)
3836 /* buf must be %d:%d\n? giving major and minor numbers */
3837 /* The new device is added to the array.
3838 * If the array has a persistent superblock, we read the
3839 * superblock to initialise info and check validity.
3840 * Otherwise, only checking done is that in bind_rdev_to_array,
3841 * which mainly checks size.
3844 int major = simple_strtoul(buf, &e, 10);
3847 struct md_rdev *rdev;
3850 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
3852 minor = simple_strtoul(e+1, &e, 10);
3853 if (*e && *e != '\n')
3855 dev = MKDEV(major, minor);
3856 if (major != MAJOR(dev) ||
3857 minor != MINOR(dev))
3861 if (mddev->persistent) {
3862 rdev = md_import_device(dev, mddev->major_version,
3863 mddev->minor_version);
3864 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
3865 struct md_rdev *rdev0
3866 = list_entry(mddev->disks.next,
3867 struct md_rdev, same_set);
3868 err = super_types[mddev->major_version]
3869 .load_super(rdev, rdev0, mddev->minor_version);
3873 } else if (mddev->external)
3874 rdev = md_import_device(dev, -2, -1);
3876 rdev = md_import_device(dev, -1, -1);
3879 return PTR_ERR(rdev);
3880 err = bind_rdev_to_array(rdev, mddev);
3884 return err ? err : len;
3887 static struct md_sysfs_entry md_new_device =
3888 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
3891 bitmap_store(struct mddev *mddev, const char *buf, size_t len)
3894 unsigned long chunk, end_chunk;
3898 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
3900 chunk = end_chunk = simple_strtoul(buf, &end, 0);
3901 if (buf == end) break;
3902 if (*end == '-') { /* range */
3904 end_chunk = simple_strtoul(buf, &end, 0);
3905 if (buf == end) break;
3907 if (*end && !isspace(*end)) break;
3908 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
3909 buf = skip_spaces(end);
3911 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
3916 static struct md_sysfs_entry md_bitmap =
3917 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
3920 size_show(struct mddev *mddev, char *page)
3922 return sprintf(page, "%llu\n",
3923 (unsigned long long)mddev->dev_sectors / 2);
3926 static int update_size(struct mddev *mddev, sector_t num_sectors);
3929 size_store(struct mddev *mddev, const char *buf, size_t len)
3931 /* If array is inactive, we can reduce the component size, but
3932 * not increase it (except from 0).
3933 * If array is active, we can try an on-line resize
3936 int err = strict_blocks_to_sectors(buf, §ors);
3941 err = update_size(mddev, sectors);
3942 md_update_sb(mddev, 1);
3944 if (mddev->dev_sectors == 0 ||
3945 mddev->dev_sectors > sectors)
3946 mddev->dev_sectors = sectors;
3950 return err ? err : len;
3953 static struct md_sysfs_entry md_size =
3954 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
3959 * 'none' for arrays with no metadata (good luck...)
3960 * 'external' for arrays with externally managed metadata,
3961 * or N.M for internally known formats
3964 metadata_show(struct mddev *mddev, char *page)
3966 if (mddev->persistent)
3967 return sprintf(page, "%d.%d\n",
3968 mddev->major_version, mddev->minor_version);
3969 else if (mddev->external)
3970 return sprintf(page, "external:%s\n", mddev->metadata_type);
3972 return sprintf(page, "none\n");
3976 metadata_store(struct mddev *mddev, const char *buf, size_t len)
3980 /* Changing the details of 'external' metadata is
3981 * always permitted. Otherwise there must be
3982 * no devices attached to the array.
3984 if (mddev->external && strncmp(buf, "external:", 9) == 0)
3986 else if (!list_empty(&mddev->disks))
3989 if (cmd_match(buf, "none")) {
3990 mddev->persistent = 0;
3991 mddev->external = 0;
3992 mddev->major_version = 0;
3993 mddev->minor_version = 90;
3996 if (strncmp(buf, "external:", 9) == 0) {
3997 size_t namelen = len-9;
3998 if (namelen >= sizeof(mddev->metadata_type))
3999 namelen = sizeof(mddev->metadata_type)-1;
4000 strncpy(mddev->metadata_type, buf+9, namelen);
4001 mddev->metadata_type[namelen] = 0;
4002 if (namelen && mddev->metadata_type[namelen-1] == '\n')
4003 mddev->metadata_type[--namelen] = 0;
4004 mddev->persistent = 0;
4005 mddev->external = 1;
4006 mddev->major_version = 0;
4007 mddev->minor_version = 90;
4010 major = simple_strtoul(buf, &e, 10);
4011 if (e==buf || *e != '.')
4014 minor = simple_strtoul(buf, &e, 10);
4015 if (e==buf || (*e && *e != '\n') )
4017 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
4019 mddev->major_version = major;
4020 mddev->minor_version = minor;
4021 mddev->persistent = 1;
4022 mddev->external = 0;
4026 static struct md_sysfs_entry md_metadata =
4027 __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
4030 action_show(struct mddev *mddev, char *page)
4032 char *type = "idle";
4033 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
4035 else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
4036 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) {
4037 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
4039 else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
4040 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
4042 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
4046 } else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
4049 return sprintf(page, "%s\n", type);
4052 static void reap_sync_thread(struct mddev *mddev);
4055 action_store(struct mddev *mddev, const char *page, size_t len)
4057 if (!mddev->pers || !mddev->pers->sync_request)
4060 if (cmd_match(page, "frozen"))
4061 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4063 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4065 if (cmd_match(page, "idle") || cmd_match(page, "frozen")) {
4066 if (mddev->sync_thread) {
4067 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4068 reap_sync_thread(mddev);
4070 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
4071 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
4073 else if (cmd_match(page, "resync"))
4074 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4075 else if (cmd_match(page, "recover")) {
4076 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
4077 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4078 } else if (cmd_match(page, "reshape")) {
4080 if (mddev->pers->start_reshape == NULL)
4082 err = mddev->pers->start_reshape(mddev);
4085 sysfs_notify(&mddev->kobj, NULL, "degraded");
4087 if (cmd_match(page, "check"))
4088 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
4089 else if (!cmd_match(page, "repair"))
4091 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
4092 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
4094 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4095 md_wakeup_thread(mddev->thread);
4096 sysfs_notify_dirent_safe(mddev->sysfs_action);
4101 mismatch_cnt_show(struct mddev *mddev, char *page)
4103 return sprintf(page, "%llu\n",
4104 (unsigned long long) mddev->resync_mismatches);
4107 static struct md_sysfs_entry md_scan_mode =
4108 __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
4111 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
4114 sync_min_show(struct mddev *mddev, char *page)
4116 return sprintf(page, "%d (%s)\n", speed_min(mddev),
4117 mddev->sync_speed_min ? "local": "system");
4121 sync_min_store(struct mddev *mddev, const char *buf, size_t len)
4125 if (strncmp(buf, "system", 6)==0) {
4126 mddev->sync_speed_min = 0;
4129 min = simple_strtoul(buf, &e, 10);
4130 if (buf == e || (*e && *e != '\n') || min <= 0)
4132 mddev->sync_speed_min = min;
4136 static struct md_sysfs_entry md_sync_min =
4137 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
4140 sync_max_show(struct mddev *mddev, char *page)
4142 return sprintf(page, "%d (%s)\n", speed_max(mddev),
4143 mddev->sync_speed_max ? "local": "system");
4147 sync_max_store(struct mddev *mddev, const char *buf, size_t len)
4151 if (strncmp(buf, "system", 6)==0) {
4152 mddev->sync_speed_max = 0;
4155 max = simple_strtoul(buf, &e, 10);
4156 if (buf == e || (*e && *e != '\n') || max <= 0)
4158 mddev->sync_speed_max = max;
4162 static struct md_sysfs_entry md_sync_max =
4163 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
4166 degraded_show(struct mddev *mddev, char *page)
4168 return sprintf(page, "%d\n", mddev->degraded);
4170 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
4173 sync_force_parallel_show(struct mddev *mddev, char *page)
4175 return sprintf(page, "%d\n", mddev->parallel_resync);
4179 sync_force_parallel_store(struct mddev *mddev, const char *buf, size_t len)
4183 if (strict_strtol(buf, 10, &n))
4186 if (n != 0 && n != 1)
4189 mddev->parallel_resync = n;
4191 if (mddev->sync_thread)
4192 wake_up(&resync_wait);
4197 /* force parallel resync, even with shared block devices */
4198 static struct md_sysfs_entry md_sync_force_parallel =
4199 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
4200 sync_force_parallel_show, sync_force_parallel_store);
4203 sync_speed_show(struct mddev *mddev, char *page)
4205 unsigned long resync, dt, db;
4206 if (mddev->curr_resync == 0)
4207 return sprintf(page, "none\n");
4208 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
4209 dt = (jiffies - mddev->resync_mark) / HZ;
4211 db = resync - mddev->resync_mark_cnt;
4212 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
4215 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
4218 sync_completed_show(struct mddev *mddev, char *page)
4220 unsigned long long max_sectors, resync;
4222 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4223 return sprintf(page, "none\n");
4225 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
4226 max_sectors = mddev->resync_max_sectors;
4228 max_sectors = mddev->dev_sectors;
4230 resync = mddev->curr_resync_completed;
4231 return sprintf(page, "%llu / %llu\n", resync, max_sectors);
4234 static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed);
4237 min_sync_show(struct mddev *mddev, char *page)
4239 return sprintf(page, "%llu\n",
4240 (unsigned long long)mddev->resync_min);
4243 min_sync_store(struct mddev *mddev, const char *buf, size_t len)
4245 unsigned long long min;
4246 if (strict_strtoull(buf, 10, &min))
4248 if (min > mddev->resync_max)
4250 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4253 /* Must be a multiple of chunk_size */
4254 if (mddev->chunk_sectors) {
4255 sector_t temp = min;
4256 if (sector_div(temp, mddev->chunk_sectors))
4259 mddev->resync_min = min;
4264 static struct md_sysfs_entry md_min_sync =
4265 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
4268 max_sync_show(struct mddev *mddev, char *page)
4270 if (mddev->resync_max == MaxSector)
4271 return sprintf(page, "max\n");
4273 return sprintf(page, "%llu\n",
4274 (unsigned long long)mddev->resync_max);
4277 max_sync_store(struct mddev *mddev, const char *buf, size_t len)
4279 if (strncmp(buf, "max", 3) == 0)
4280 mddev->resync_max = MaxSector;
4282 unsigned long long max;
4283 if (strict_strtoull(buf, 10, &max))
4285 if (max < mddev->resync_min)
4287 if (max < mddev->resync_max &&
4289 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4292 /* Must be a multiple of chunk_size */
4293 if (mddev->chunk_sectors) {
4294 sector_t temp = max;
4295 if (sector_div(temp, mddev->chunk_sectors))
4298 mddev->resync_max = max;
4300 wake_up(&mddev->recovery_wait);
4304 static struct md_sysfs_entry md_max_sync =
4305 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
4308 suspend_lo_show(struct mddev *mddev, char *page)
4310 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
4314 suspend_lo_store(struct mddev *mddev, const char *buf, size_t len)
4317 unsigned long long new = simple_strtoull(buf, &e, 10);
4318 unsigned long long old = mddev->suspend_lo;
4320 if (mddev->pers == NULL ||
4321 mddev->pers->quiesce == NULL)
4323 if (buf == e || (*e && *e != '\n'))
4326 mddev->suspend_lo = new;
4328 /* Shrinking suspended region */
4329 mddev->pers->quiesce(mddev, 2);
4331 /* Expanding suspended region - need to wait */
4332 mddev->pers->quiesce(mddev, 1);
4333 mddev->pers->quiesce(mddev, 0);
4337 static struct md_sysfs_entry md_suspend_lo =
4338 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
4342 suspend_hi_show(struct mddev *mddev, char *page)
4344 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
4348 suspend_hi_store(struct mddev *mddev, const char *buf, size_t len)
4351 unsigned long long new = simple_strtoull(buf, &e, 10);
4352 unsigned long long old = mddev->suspend_hi;
4354 if (mddev->pers == NULL ||
4355 mddev->pers->quiesce == NULL)
4357 if (buf == e || (*e && *e != '\n'))
4360 mddev->suspend_hi = new;
4362 /* Shrinking suspended region */
4363 mddev->pers->quiesce(mddev, 2);
4365 /* Expanding suspended region - need to wait */
4366 mddev->pers->quiesce(mddev, 1);
4367 mddev->pers->quiesce(mddev, 0);
4371 static struct md_sysfs_entry md_suspend_hi =
4372 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
4375 reshape_position_show(struct mddev *mddev, char *page)
4377 if (mddev->reshape_position != MaxSector)
4378 return sprintf(page, "%llu\n",
4379 (unsigned long long)mddev->reshape_position);
4380 strcpy(page, "none\n");
4385 reshape_position_store(struct mddev *mddev, const char *buf, size_t len)
4388 unsigned long long new = simple_strtoull(buf, &e, 10);
4391 if (buf == e || (*e && *e != '\n'))
4393 mddev->reshape_position = new;
4394 mddev->delta_disks = 0;
4395 mddev->new_level = mddev->level;
4396 mddev->new_layout = mddev->layout;
4397 mddev->new_chunk_sectors = mddev->chunk_sectors;
4401 static struct md_sysfs_entry md_reshape_position =
4402 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
4403 reshape_position_store);
4406 array_size_show(struct mddev *mddev, char *page)
4408 if (mddev->external_size)
4409 return sprintf(page, "%llu\n",
4410 (unsigned long long)mddev->array_sectors/2);
4412 return sprintf(page, "default\n");
4416 array_size_store(struct mddev *mddev, const char *buf, size_t len)
4420 if (strncmp(buf, "default", 7) == 0) {
4422 sectors = mddev->pers->size(mddev, 0, 0);
4424 sectors = mddev->array_sectors;
4426 mddev->external_size = 0;
4428 if (strict_blocks_to_sectors(buf, §ors) < 0)
4430 if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors)
4433 mddev->external_size = 1;
4436 mddev->array_sectors = sectors;
4438 set_capacity(mddev->gendisk, mddev->array_sectors);
4439 revalidate_disk(mddev->gendisk);
4444 static struct md_sysfs_entry md_array_size =
4445 __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show,
4448 static struct attribute *md_default_attrs[] = {
4451 &md_raid_disks.attr,
4452 &md_chunk_size.attr,
4454 &md_resync_start.attr,
4456 &md_new_device.attr,
4457 &md_safe_delay.attr,
4458 &md_array_state.attr,
4459 &md_reshape_position.attr,
4460 &md_array_size.attr,
4461 &max_corr_read_errors.attr,
4465 static struct attribute *md_redundancy_attrs[] = {
4467 &md_mismatches.attr,
4470 &md_sync_speed.attr,
4471 &md_sync_force_parallel.attr,
4472 &md_sync_completed.attr,
4475 &md_suspend_lo.attr,
4476 &md_suspend_hi.attr,
4481 static struct attribute_group md_redundancy_group = {
4483 .attrs = md_redundancy_attrs,
4488 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
4490 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
4491 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
4496 spin_lock(&all_mddevs_lock);
4497 if (list_empty(&mddev->all_mddevs)) {
4498 spin_unlock(&all_mddevs_lock);
4502 spin_unlock(&all_mddevs_lock);
4504 rv = mddev_lock(mddev);
4506 rv = entry->show(mddev, page);
4507 mddev_unlock(mddev);
4514 md_attr_store(struct kobject *kobj, struct attribute *attr,
4515 const char *page, size_t length)
4517 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
4518 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
4523 if (!capable(CAP_SYS_ADMIN))
4525 spin_lock(&all_mddevs_lock);
4526 if (list_empty(&mddev->all_mddevs)) {
4527 spin_unlock(&all_mddevs_lock);
4531 spin_unlock(&all_mddevs_lock);
4532 rv = mddev_lock(mddev);
4534 rv = entry->store(mddev, page, length);
4535 mddev_unlock(mddev);
4541 static void md_free(struct kobject *ko)
4543 struct mddev *mddev = container_of(ko, struct mddev, kobj);
4545 if (mddev->sysfs_state)
4546 sysfs_put(mddev->sysfs_state);
4548 if (mddev->gendisk) {
4549 del_gendisk(mddev->gendisk);
4550 put_disk(mddev->gendisk);
4553 blk_cleanup_queue(mddev->queue);
4558 static const struct sysfs_ops md_sysfs_ops = {
4559 .show = md_attr_show,
4560 .store = md_attr_store,
4562 static struct kobj_type md_ktype = {
4564 .sysfs_ops = &md_sysfs_ops,
4565 .default_attrs = md_default_attrs,
4570 static void mddev_delayed_delete(struct work_struct *ws)
4572 struct mddev *mddev = container_of(ws, struct mddev, del_work);
4574 sysfs_remove_group(&mddev->kobj, &md_bitmap_group);
4575 kobject_del(&mddev->kobj);
4576 kobject_put(&mddev->kobj);
4579 static int md_alloc(dev_t dev, char *name)
4581 static DEFINE_MUTEX(disks_mutex);
4582 struct mddev *mddev = mddev_find(dev);
4583 struct gendisk *disk;
4592 partitioned = (MAJOR(mddev->unit) != MD_MAJOR);
4593 shift = partitioned ? MdpMinorShift : 0;
4594 unit = MINOR(mddev->unit) >> shift;
4596 /* wait for any previous instance of this device to be
4597 * completely removed (mddev_delayed_delete).
4599 flush_workqueue(md_misc_wq);
4601 mutex_lock(&disks_mutex);
4607 /* Need to ensure that 'name' is not a duplicate.
4609 struct mddev *mddev2;
4610 spin_lock(&all_mddevs_lock);
4612 list_for_each_entry(mddev2, &all_mddevs, all_mddevs)
4613 if (mddev2->gendisk &&
4614 strcmp(mddev2->gendisk->disk_name, name) == 0) {
4615 spin_unlock(&all_mddevs_lock);
4618 spin_unlock(&all_mddevs_lock);
4622 mddev->queue = blk_alloc_queue(GFP_KERNEL);
4625 mddev->queue->queuedata = mddev;
4627 blk_queue_make_request(mddev->queue, md_make_request);
4629 disk = alloc_disk(1 << shift);
4631 blk_cleanup_queue(mddev->queue);
4632 mddev->queue = NULL;
4635 disk->major = MAJOR(mddev->unit);
4636 disk->first_minor = unit << shift;
4638 strcpy(disk->disk_name, name);
4639 else if (partitioned)
4640 sprintf(disk->disk_name, "md_d%d", unit);
4642 sprintf(disk->disk_name, "md%d", unit);
4643 disk->fops = &md_fops;
4644 disk->private_data = mddev;
4645 disk->queue = mddev->queue;
4646 blk_queue_flush(mddev->queue, REQ_FLUSH | REQ_FUA);
4647 /* Allow extended partitions. This makes the
4648 * 'mdp' device redundant, but we can't really
4651 disk->flags |= GENHD_FL_EXT_DEVT;
4652 mddev->gendisk = disk;
4653 /* As soon as we call add_disk(), another thread could get
4654 * through to md_open, so make sure it doesn't get too far
4656 mutex_lock(&mddev->open_mutex);
4659 error = kobject_init_and_add(&mddev->kobj, &md_ktype,
4660 &disk_to_dev(disk)->kobj, "%s", "md");
4662 /* This isn't possible, but as kobject_init_and_add is marked
4663 * __must_check, we must do something with the result
4665 printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
4669 if (mddev->kobj.sd &&
4670 sysfs_create_group(&mddev->kobj, &md_bitmap_group))
4671 printk(KERN_DEBUG "pointless warning\n");
4672 mutex_unlock(&mddev->open_mutex);
4674 mutex_unlock(&disks_mutex);
4675 if (!error && mddev->kobj.sd) {
4676 kobject_uevent(&mddev->kobj, KOBJ_ADD);
4677 mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state");
4683 static struct kobject *md_probe(dev_t dev, int *part, void *data)
4685 md_alloc(dev, NULL);
4689 static int add_named_array(const char *val, struct kernel_param *kp)
4691 /* val must be "md_*" where * is not all digits.
4692 * We allocate an array with a large free minor number, and
4693 * set the name to val. val must not already be an active name.
4695 int len = strlen(val);
4696 char buf[DISK_NAME_LEN];
4698 while (len && val[len-1] == '\n')
4700 if (len >= DISK_NAME_LEN)
4702 strlcpy(buf, val, len+1);
4703 if (strncmp(buf, "md_", 3) != 0)
4705 return md_alloc(0, buf);
4708 static void md_safemode_timeout(unsigned long data)
4710 struct mddev *mddev = (struct mddev *) data;
4712 if (!atomic_read(&mddev->writes_pending)) {
4713 mddev->safemode = 1;
4714 if (mddev->external)
4715 sysfs_notify_dirent_safe(mddev->sysfs_state);
4717 md_wakeup_thread(mddev->thread);
4720 static int start_dirty_degraded;
4722 int md_run(struct mddev *mddev)
4725 struct md_rdev *rdev;
4726 struct md_personality *pers;
4728 if (list_empty(&mddev->disks))
4729 /* cannot run an array with no devices.. */
4734 /* Cannot run until previous stop completes properly */
4735 if (mddev->sysfs_active)
4739 * Analyze all RAID superblock(s)
4741 if (!mddev->raid_disks) {
4742 if (!mddev->persistent)
4747 if (mddev->level != LEVEL_NONE)
4748 request_module("md-level-%d", mddev->level);
4749 else if (mddev->clevel[0])
4750 request_module("md-%s", mddev->clevel);
4753 * Drop all container device buffers, from now on
4754 * the only valid external interface is through the md
4757 list_for_each_entry(rdev, &mddev->disks, same_set) {
4758 if (test_bit(Faulty, &rdev->flags))
4760 sync_blockdev(rdev->bdev);
4761 invalidate_bdev(rdev->bdev);
4763 /* perform some consistency tests on the device.
4764 * We don't want the data to overlap the metadata,
4765 * Internal Bitmap issues have been handled elsewhere.
4767 if (rdev->meta_bdev) {
4768 /* Nothing to check */;
4769 } else if (rdev->data_offset < rdev->sb_start) {
4770 if (mddev->dev_sectors &&
4771 rdev->data_offset + mddev->dev_sectors
4773 printk("md: %s: data overlaps metadata\n",
4778 if (rdev->sb_start + rdev->sb_size/512
4779 > rdev->data_offset) {
4780 printk("md: %s: metadata overlaps data\n",
4785 sysfs_notify_dirent_safe(rdev->sysfs_state);
4788 if (mddev->bio_set == NULL)
4789 mddev->bio_set = bioset_create(BIO_POOL_SIZE,
4790 sizeof(struct mddev *));
4792 spin_lock(&pers_lock);
4793 pers = find_pers(mddev->level, mddev->clevel);
4794 if (!pers || !try_module_get(pers->owner)) {
4795 spin_unlock(&pers_lock);
4796 if (mddev->level != LEVEL_NONE)
4797 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
4800 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
4805 spin_unlock(&pers_lock);
4806 if (mddev->level != pers->level) {
4807 mddev->level = pers->level;
4808 mddev->new_level = pers->level;
4810 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
4812 if (mddev->reshape_position != MaxSector &&
4813 pers->start_reshape == NULL) {
4814 /* This personality cannot handle reshaping... */
4816 module_put(pers->owner);
4820 if (pers->sync_request) {
4821 /* Warn if this is a potentially silly
4824 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
4825 struct md_rdev *rdev2;
4828 list_for_each_entry(rdev, &mddev->disks, same_set)
4829 list_for_each_entry(rdev2, &mddev->disks, same_set) {
4831 rdev->bdev->bd_contains ==
4832 rdev2->bdev->bd_contains) {
4834 "%s: WARNING: %s appears to be"
4835 " on the same physical disk as"
4838 bdevname(rdev->bdev,b),
4839 bdevname(rdev2->bdev,b2));
4846 "True protection against single-disk"
4847 " failure might be compromised.\n");
4850 mddev->recovery = 0;
4851 /* may be over-ridden by personality */
4852 mddev->resync_max_sectors = mddev->dev_sectors;
4854 mddev->ok_start_degraded = start_dirty_degraded;
4856 if (start_readonly && mddev->ro == 0)
4857 mddev->ro = 2; /* read-only, but switch on first write */
4859 err = mddev->pers->run(mddev);
4861 printk(KERN_ERR "md: pers->run() failed ...\n");
4862 else if (mddev->pers->size(mddev, 0, 0) < mddev->array_sectors) {
4863 WARN_ONCE(!mddev->external_size, "%s: default size too small,"
4864 " but 'external_size' not in effect?\n", __func__);
4866 "md: invalid array_size %llu > default size %llu\n",
4867 (unsigned long long)mddev->array_sectors / 2,
4868 (unsigned long long)mddev->pers->size(mddev, 0, 0) / 2);
4870 mddev->pers->stop(mddev);
4872 if (err == 0 && mddev->pers->sync_request) {
4873 err = bitmap_create(mddev);
4875 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
4876 mdname(mddev), err);
4877 mddev->pers->stop(mddev);
4881 module_put(mddev->pers->owner);
4883 bitmap_destroy(mddev);
4886 if (mddev->pers->sync_request) {
4887 if (mddev->kobj.sd &&
4888 sysfs_create_group(&mddev->kobj, &md_redundancy_group))
4890 "md: cannot register extra attributes for %s\n",
4892 mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action");
4893 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
4896 atomic_set(&mddev->writes_pending,0);
4897 atomic_set(&mddev->max_corr_read_errors,
4898 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS);
4899 mddev->safemode = 0;
4900 mddev->safemode_timer.function = md_safemode_timeout;
4901 mddev->safemode_timer.data = (unsigned long) mddev;
4902 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
4906 list_for_each_entry(rdev, &mddev->disks, same_set)
4907 if (rdev->raid_disk >= 0)
4908 if (sysfs_link_rdev(mddev, rdev))
4909 /* failure here is OK */;
4911 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4914 md_update_sb(mddev, 0);
4916 md_new_event(mddev);
4917 sysfs_notify_dirent_safe(mddev->sysfs_state);
4918 sysfs_notify_dirent_safe(mddev->sysfs_action);
4919 sysfs_notify(&mddev->kobj, NULL, "degraded");
4922 EXPORT_SYMBOL_GPL(md_run);
4924 static int do_md_run(struct mddev *mddev)
4928 err = md_run(mddev);
4931 err = bitmap_load(mddev);
4933 bitmap_destroy(mddev);
4937 md_wakeup_thread(mddev->thread);
4938 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
4940 set_capacity(mddev->gendisk, mddev->array_sectors);
4941 revalidate_disk(mddev->gendisk);
4943 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
4948 static int restart_array(struct mddev *mddev)
4950 struct gendisk *disk = mddev->gendisk;
4952 /* Complain if it has no devices */
4953 if (list_empty(&mddev->disks))
4959 mddev->safemode = 0;
4961 set_disk_ro(disk, 0);
4962 printk(KERN_INFO "md: %s switched to read-write mode.\n",
4964 /* Kick recovery or resync if necessary */
4965 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4966 md_wakeup_thread(mddev->thread);
4967 md_wakeup_thread(mddev->sync_thread);
4968 sysfs_notify_dirent_safe(mddev->sysfs_state);
4972 /* similar to deny_write_access, but accounts for our holding a reference
4973 * to the file ourselves */
4974 static int deny_bitmap_write_access(struct file * file)
4976 struct inode *inode = file->f_mapping->host;
4978 spin_lock(&inode->i_lock);
4979 if (atomic_read(&inode->i_writecount) > 1) {
4980 spin_unlock(&inode->i_lock);
4983 atomic_set(&inode->i_writecount, -1);
4984 spin_unlock(&inode->i_lock);
4989 void restore_bitmap_write_access(struct file *file)
4991 struct inode *inode = file->f_mapping->host;
4993 spin_lock(&inode->i_lock);
4994 atomic_set(&inode->i_writecount, 1);
4995 spin_unlock(&inode->i_lock);
4998 static void md_clean(struct mddev *mddev)
5000 mddev->array_sectors = 0;
5001 mddev->external_size = 0;
5002 mddev->dev_sectors = 0;
5003 mddev->raid_disks = 0;
5004 mddev->recovery_cp = 0;
5005 mddev->resync_min = 0;
5006 mddev->resync_max = MaxSector;
5007 mddev->reshape_position = MaxSector;
5008 mddev->external = 0;
5009 mddev->persistent = 0;
5010 mddev->level = LEVEL_NONE;
5011 mddev->clevel[0] = 0;
5014 mddev->metadata_type[0] = 0;
5015 mddev->chunk_sectors = 0;
5016 mddev->ctime = mddev->utime = 0;
5018 mddev->max_disks = 0;
5020 mddev->can_decrease_events = 0;
5021 mddev->delta_disks = 0;
5022 mddev->new_level = LEVEL_NONE;
5023 mddev->new_layout = 0;
5024 mddev->new_chunk_sectors = 0;
5025 mddev->curr_resync = 0;
5026 mddev->resync_mismatches = 0;
5027 mddev->suspend_lo = mddev->suspend_hi = 0;
5028 mddev->sync_speed_min = mddev->sync_speed_max = 0;
5029 mddev->recovery = 0;
5032 mddev->degraded = 0;
5033 mddev->safemode = 0;
5034 mddev->bitmap_info.offset = 0;
5035 mddev->bitmap_info.default_offset = 0;
5036 mddev->bitmap_info.chunksize = 0;
5037 mddev->bitmap_info.daemon_sleep = 0;
5038 mddev->bitmap_info.max_write_behind = 0;
5041 static void __md_stop_writes(struct mddev *mddev)
5043 if (mddev->sync_thread) {
5044 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5045 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5046 reap_sync_thread(mddev);
5049 del_timer_sync(&mddev->safemode_timer);
5051 bitmap_flush(mddev);
5052 md_super_wait(mddev);
5054 if (!mddev->in_sync || mddev->flags) {
5055 /* mark array as shutdown cleanly */
5057 md_update_sb(mddev, 1);
5061 void md_stop_writes(struct mddev *mddev)
5064 __md_stop_writes(mddev);
5065 mddev_unlock(mddev);
5067 EXPORT_SYMBOL_GPL(md_stop_writes);
5069 void md_stop(struct mddev *mddev)
5072 mddev->pers->stop(mddev);
5073 if (mddev->pers->sync_request && mddev->to_remove == NULL)
5074 mddev->to_remove = &md_redundancy_group;
5075 module_put(mddev->pers->owner);
5077 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5079 EXPORT_SYMBOL_GPL(md_stop);
5081 static int md_set_readonly(struct mddev *mddev, int is_open)
5084 mutex_lock(&mddev->open_mutex);
5085 if (atomic_read(&mddev->openers) > is_open) {
5086 printk("md: %s still in use.\n",mdname(mddev));
5091 __md_stop_writes(mddev);
5097 set_disk_ro(mddev->gendisk, 1);
5098 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5099 sysfs_notify_dirent_safe(mddev->sysfs_state);
5103 mutex_unlock(&mddev->open_mutex);
5108 * 0 - completely stop and dis-assemble array
5109 * 2 - stop but do not disassemble array
5111 static int do_md_stop(struct mddev * mddev, int mode, int is_open)
5113 struct gendisk *disk = mddev->gendisk;
5114 struct md_rdev *rdev;
5116 mutex_lock(&mddev->open_mutex);
5117 if (atomic_read(&mddev->openers) > is_open ||
5118 mddev->sysfs_active) {
5119 printk("md: %s still in use.\n",mdname(mddev));
5120 mutex_unlock(&mddev->open_mutex);
5126 set_disk_ro(disk, 0);
5128 __md_stop_writes(mddev);
5130 mddev->queue->merge_bvec_fn = NULL;
5131 mddev->queue->backing_dev_info.congested_fn = NULL;
5133 /* tell userspace to handle 'inactive' */
5134 sysfs_notify_dirent_safe(mddev->sysfs_state);
5136 list_for_each_entry(rdev, &mddev->disks, same_set)
5137 if (rdev->raid_disk >= 0)
5138 sysfs_unlink_rdev(mddev, rdev);
5140 set_capacity(disk, 0);
5141 mutex_unlock(&mddev->open_mutex);
5143 revalidate_disk(disk);
5148 mutex_unlock(&mddev->open_mutex);
5150 * Free resources if final stop
5153 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
5155 bitmap_destroy(mddev);
5156 if (mddev->bitmap_info.file) {
5157 restore_bitmap_write_access(mddev->bitmap_info.file);
5158 fput(mddev->bitmap_info.file);
5159 mddev->bitmap_info.file = NULL;
5161 mddev->bitmap_info.offset = 0;
5163 export_array(mddev);
5166 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
5167 if (mddev->hold_active == UNTIL_STOP)
5168 mddev->hold_active = 0;
5170 blk_integrity_unregister(disk);
5171 md_new_event(mddev);
5172 sysfs_notify_dirent_safe(mddev->sysfs_state);
5177 static void autorun_array(struct mddev *mddev)
5179 struct md_rdev *rdev;
5182 if (list_empty(&mddev->disks))
5185 printk(KERN_INFO "md: running: ");
5187 list_for_each_entry(rdev, &mddev->disks, same_set) {
5188 char b[BDEVNAME_SIZE];
5189 printk("<%s>", bdevname(rdev->bdev,b));
5193 err = do_md_run(mddev);
5195 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
5196 do_md_stop(mddev, 0, 0);
5201 * lets try to run arrays based on all disks that have arrived
5202 * until now. (those are in pending_raid_disks)
5204 * the method: pick the first pending disk, collect all disks with
5205 * the same UUID, remove all from the pending list and put them into
5206 * the 'same_array' list. Then order this list based on superblock
5207 * update time (freshest comes first), kick out 'old' disks and
5208 * compare superblocks. If everything's fine then run it.
5210 * If "unit" is allocated, then bump its reference count
5212 static void autorun_devices(int part)
5214 struct md_rdev *rdev0, *rdev, *tmp;
5215 struct mddev *mddev;
5216 char b[BDEVNAME_SIZE];
5218 printk(KERN_INFO "md: autorun ...\n");
5219 while (!list_empty(&pending_raid_disks)) {
5222 LIST_HEAD(candidates);
5223 rdev0 = list_entry(pending_raid_disks.next,
5224 struct md_rdev, same_set);
5226 printk(KERN_INFO "md: considering %s ...\n",
5227 bdevname(rdev0->bdev,b));
5228 INIT_LIST_HEAD(&candidates);
5229 rdev_for_each_list(rdev, tmp, &pending_raid_disks)
5230 if (super_90_load(rdev, rdev0, 0) >= 0) {
5231 printk(KERN_INFO "md: adding %s ...\n",
5232 bdevname(rdev->bdev,b));
5233 list_move(&rdev->same_set, &candidates);
5236 * now we have a set of devices, with all of them having
5237 * mostly sane superblocks. It's time to allocate the
5241 dev = MKDEV(mdp_major,
5242 rdev0->preferred_minor << MdpMinorShift);
5243 unit = MINOR(dev) >> MdpMinorShift;
5245 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
5248 if (rdev0->preferred_minor != unit) {
5249 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
5250 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
5254 md_probe(dev, NULL, NULL);
5255 mddev = mddev_find(dev);
5256 if (!mddev || !mddev->gendisk) {
5260 "md: cannot allocate memory for md drive.\n");
5263 if (mddev_lock(mddev))
5264 printk(KERN_WARNING "md: %s locked, cannot run\n",
5266 else if (mddev->raid_disks || mddev->major_version
5267 || !list_empty(&mddev->disks)) {
5269 "md: %s already running, cannot run %s\n",
5270 mdname(mddev), bdevname(rdev0->bdev,b));
5271 mddev_unlock(mddev);
5273 printk(KERN_INFO "md: created %s\n", mdname(mddev));
5274 mddev->persistent = 1;
5275 rdev_for_each_list(rdev, tmp, &candidates) {
5276 list_del_init(&rdev->same_set);
5277 if (bind_rdev_to_array(rdev, mddev))
5280 autorun_array(mddev);
5281 mddev_unlock(mddev);
5283 /* on success, candidates will be empty, on error
5286 rdev_for_each_list(rdev, tmp, &candidates) {
5287 list_del_init(&rdev->same_set);
5292 printk(KERN_INFO "md: ... autorun DONE.\n");
5294 #endif /* !MODULE */
5296 static int get_version(void __user * arg)
5300 ver.major = MD_MAJOR_VERSION;
5301 ver.minor = MD_MINOR_VERSION;
5302 ver.patchlevel = MD_PATCHLEVEL_VERSION;
5304 if (copy_to_user(arg, &ver, sizeof(ver)))
5310 static int get_array_info(struct mddev * mddev, void __user * arg)
5312 mdu_array_info_t info;
5313 int nr,working,insync,failed,spare;
5314 struct md_rdev *rdev;
5316 nr=working=insync=failed=spare=0;
5317 list_for_each_entry(rdev, &mddev->disks, same_set) {
5319 if (test_bit(Faulty, &rdev->flags))
5323 if (test_bit(In_sync, &rdev->flags))
5330 info.major_version = mddev->major_version;
5331 info.minor_version = mddev->minor_version;
5332 info.patch_version = MD_PATCHLEVEL_VERSION;
5333 info.ctime = mddev->ctime;
5334 info.level = mddev->level;
5335 info.size = mddev->dev_sectors / 2;
5336 if (info.size != mddev->dev_sectors / 2) /* overflow */
5339 info.raid_disks = mddev->raid_disks;
5340 info.md_minor = mddev->md_minor;
5341 info.not_persistent= !mddev->persistent;
5343 info.utime = mddev->utime;
5346 info.state = (1<<MD_SB_CLEAN);
5347 if (mddev->bitmap && mddev->bitmap_info.offset)
5348 info.state = (1<<MD_SB_BITMAP_PRESENT);
5349 info.active_disks = insync;
5350 info.working_disks = working;
5351 info.failed_disks = failed;
5352 info.spare_disks = spare;
5354 info.layout = mddev->layout;
5355 info.chunk_size = mddev->chunk_sectors << 9;
5357 if (copy_to_user(arg, &info, sizeof(info)))
5363 static int get_bitmap_file(struct mddev * mddev, void __user * arg)
5365 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
5366 char *ptr, *buf = NULL;
5369 if (md_allow_write(mddev))
5370 file = kmalloc(sizeof(*file), GFP_NOIO);
5372 file = kmalloc(sizeof(*file), GFP_KERNEL);
5377 /* bitmap disabled, zero the first byte and copy out */
5378 if (!mddev->bitmap || !mddev->bitmap->file) {
5379 file->pathname[0] = '\0';
5383 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
5387 ptr = d_path(&mddev->bitmap->file->f_path, buf, sizeof(file->pathname));
5391 strcpy(file->pathname, ptr);
5395 if (copy_to_user(arg, file, sizeof(*file)))
5403 static int get_disk_info(struct mddev * mddev, void __user * arg)
5405 mdu_disk_info_t info;
5406 struct md_rdev *rdev;
5408 if (copy_from_user(&info, arg, sizeof(info)))
5411 rdev = find_rdev_nr(mddev, info.number);
5413 info.major = MAJOR(rdev->bdev->bd_dev);
5414 info.minor = MINOR(rdev->bdev->bd_dev);
5415 info.raid_disk = rdev->raid_disk;
5417 if (test_bit(Faulty, &rdev->flags))
5418 info.state |= (1<<MD_DISK_FAULTY);
5419 else if (test_bit(In_sync, &rdev->flags)) {
5420 info.state |= (1<<MD_DISK_ACTIVE);
5421 info.state |= (1<<MD_DISK_SYNC);
5423 if (test_bit(WriteMostly, &rdev->flags))
5424 info.state |= (1<<MD_DISK_WRITEMOSTLY);
5426 info.major = info.minor = 0;
5427 info.raid_disk = -1;
5428 info.state = (1<<MD_DISK_REMOVED);
5431 if (copy_to_user(arg, &info, sizeof(info)))
5437 static int add_new_disk(struct mddev * mddev, mdu_disk_info_t *info)
5439 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
5440 struct md_rdev *rdev;
5441 dev_t dev = MKDEV(info->major,info->minor);
5443 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
5446 if (!mddev->raid_disks) {
5448 /* expecting a device which has a superblock */
5449 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
5452 "md: md_import_device returned %ld\n",
5454 return PTR_ERR(rdev);
5456 if (!list_empty(&mddev->disks)) {
5457 struct md_rdev *rdev0
5458 = list_entry(mddev->disks.next,
5459 struct md_rdev, same_set);
5460 err = super_types[mddev->major_version]
5461 .load_super(rdev, rdev0, mddev->minor_version);
5464 "md: %s has different UUID to %s\n",
5465 bdevname(rdev->bdev,b),
5466 bdevname(rdev0->bdev,b2));
5471 err = bind_rdev_to_array(rdev, mddev);
5478 * add_new_disk can be used once the array is assembled
5479 * to add "hot spares". They must already have a superblock
5484 if (!mddev->pers->hot_add_disk) {
5486 "%s: personality does not support diskops!\n",
5490 if (mddev->persistent)
5491 rdev = md_import_device(dev, mddev->major_version,
5492 mddev->minor_version);
5494 rdev = md_import_device(dev, -1, -1);
5497 "md: md_import_device returned %ld\n",
5499 return PTR_ERR(rdev);
5501 /* set saved_raid_disk if appropriate */
5502 if (!mddev->persistent) {
5503 if (info->state & (1<<MD_DISK_SYNC) &&
5504 info->raid_disk < mddev->raid_disks) {
5505 rdev->raid_disk = info->raid_disk;
5506 set_bit(In_sync, &rdev->flags);
5508 rdev->raid_disk = -1;
5510 super_types[mddev->major_version].
5511 validate_super(mddev, rdev);
5512 if ((info->state & (1<<MD_DISK_SYNC)) &&
5513 (!test_bit(In_sync, &rdev->flags) ||
5514 rdev->raid_disk != info->raid_disk)) {
5515 /* This was a hot-add request, but events doesn't
5516 * match, so reject it.
5522 if (test_bit(In_sync, &rdev->flags))
5523 rdev->saved_raid_disk = rdev->raid_disk;
5525 rdev->saved_raid_disk = -1;
5527 clear_bit(In_sync, &rdev->flags); /* just to be sure */
5528 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
5529 set_bit(WriteMostly, &rdev->flags);
5531 clear_bit(WriteMostly, &rdev->flags);
5533 rdev->raid_disk = -1;
5534 err = bind_rdev_to_array(rdev, mddev);
5535 if (!err && !mddev->pers->hot_remove_disk) {
5536 /* If there is hot_add_disk but no hot_remove_disk
5537 * then added disks for geometry changes,
5538 * and should be added immediately.
5540 super_types[mddev->major_version].
5541 validate_super(mddev, rdev);
5542 err = mddev->pers->hot_add_disk(mddev, rdev);
5544 unbind_rdev_from_array(rdev);
5549 sysfs_notify_dirent_safe(rdev->sysfs_state);
5551 md_update_sb(mddev, 1);
5552 if (mddev->degraded)
5553 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
5554 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5556 md_new_event(mddev);
5557 md_wakeup_thread(mddev->thread);
5561 /* otherwise, add_new_disk is only allowed
5562 * for major_version==0 superblocks
5564 if (mddev->major_version != 0) {
5565 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
5570 if (!(info->state & (1<<MD_DISK_FAULTY))) {
5572 rdev = md_import_device(dev, -1, 0);
5575 "md: error, md_import_device() returned %ld\n",
5577 return PTR_ERR(rdev);
5579 rdev->desc_nr = info->number;
5580 if (info->raid_disk < mddev->raid_disks)
5581 rdev->raid_disk = info->raid_disk;
5583 rdev->raid_disk = -1;
5585 if (rdev->raid_disk < mddev->raid_disks)
5586 if (info->state & (1<<MD_DISK_SYNC))
5587 set_bit(In_sync, &rdev->flags);
5589 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
5590 set_bit(WriteMostly, &rdev->flags);
5592 if (!mddev->persistent) {
5593 printk(KERN_INFO "md: nonpersistent superblock ...\n");
5594 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
5596 rdev->sb_start = calc_dev_sboffset(rdev);
5597 rdev->sectors = rdev->sb_start;
5599 err = bind_rdev_to_array(rdev, mddev);
5609 static int hot_remove_disk(struct mddev * mddev, dev_t dev)
5611 char b[BDEVNAME_SIZE];
5612 struct md_rdev *rdev;
5614 rdev = find_rdev(mddev, dev);
5618 if (rdev->raid_disk >= 0)
5621 kick_rdev_from_array(rdev);
5622 md_update_sb(mddev, 1);
5623 md_new_event(mddev);
5627 printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n",
5628 bdevname(rdev->bdev,b), mdname(mddev));
5632 static int hot_add_disk(struct mddev * mddev, dev_t dev)
5634 char b[BDEVNAME_SIZE];
5636 struct md_rdev *rdev;
5641 if (mddev->major_version != 0) {
5642 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
5643 " version-0 superblocks.\n",
5647 if (!mddev->pers->hot_add_disk) {
5649 "%s: personality does not support diskops!\n",
5654 rdev = md_import_device(dev, -1, 0);
5657 "md: error, md_import_device() returned %ld\n",
5662 if (mddev->persistent)
5663 rdev->sb_start = calc_dev_sboffset(rdev);
5665 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
5667 rdev->sectors = rdev->sb_start;
5669 if (test_bit(Faulty, &rdev->flags)) {
5671 "md: can not hot-add faulty %s disk to %s!\n",
5672 bdevname(rdev->bdev,b), mdname(mddev));
5676 clear_bit(In_sync, &rdev->flags);
5678 rdev->saved_raid_disk = -1;
5679 err = bind_rdev_to_array(rdev, mddev);
5684 * The rest should better be atomic, we can have disk failures
5685 * noticed in interrupt contexts ...
5688 rdev->raid_disk = -1;
5690 md_update_sb(mddev, 1);
5693 * Kick recovery, maybe this spare has to be added to the
5694 * array immediately.
5696 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5697 md_wakeup_thread(mddev->thread);
5698 md_new_event(mddev);
5706 static int set_bitmap_file(struct mddev *mddev, int fd)
5711 if (!mddev->pers->quiesce)
5713 if (mddev->recovery || mddev->sync_thread)
5715 /* we should be able to change the bitmap.. */
5721 return -EEXIST; /* cannot add when bitmap is present */
5722 mddev->bitmap_info.file = fget(fd);
5724 if (mddev->bitmap_info.file == NULL) {
5725 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
5730 err = deny_bitmap_write_access(mddev->bitmap_info.file);
5732 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
5734 fput(mddev->bitmap_info.file);
5735 mddev->bitmap_info.file = NULL;
5738 mddev->bitmap_info.offset = 0; /* file overrides offset */
5739 } else if (mddev->bitmap == NULL)
5740 return -ENOENT; /* cannot remove what isn't there */
5743 mddev->pers->quiesce(mddev, 1);
5745 err = bitmap_create(mddev);
5747 err = bitmap_load(mddev);
5749 if (fd < 0 || err) {
5750 bitmap_destroy(mddev);
5751 fd = -1; /* make sure to put the file */
5753 mddev->pers->quiesce(mddev, 0);
5756 if (mddev->bitmap_info.file) {
5757 restore_bitmap_write_access(mddev->bitmap_info.file);
5758 fput(mddev->bitmap_info.file);
5760 mddev->bitmap_info.file = NULL;
5767 * set_array_info is used two different ways
5768 * The original usage is when creating a new array.
5769 * In this usage, raid_disks is > 0 and it together with
5770 * level, size, not_persistent,layout,chunksize determine the
5771 * shape of the array.
5772 * This will always create an array with a type-0.90.0 superblock.
5773 * The newer usage is when assembling an array.
5774 * In this case raid_disks will be 0, and the major_version field is
5775 * use to determine which style super-blocks are to be found on the devices.
5776 * The minor and patch _version numbers are also kept incase the
5777 * super_block handler wishes to interpret them.
5779 static int set_array_info(struct mddev * mddev, mdu_array_info_t *info)
5782 if (info->raid_disks == 0) {
5783 /* just setting version number for superblock loading */
5784 if (info->major_version < 0 ||
5785 info->major_version >= ARRAY_SIZE(super_types) ||
5786 super_types[info->major_version].name == NULL) {
5787 /* maybe try to auto-load a module? */
5789 "md: superblock version %d not known\n",
5790 info->major_version);
5793 mddev->major_version = info->major_version;
5794 mddev->minor_version = info->minor_version;
5795 mddev->patch_version = info->patch_version;
5796 mddev->persistent = !info->not_persistent;
5797 /* ensure mddev_put doesn't delete this now that there
5798 * is some minimal configuration.
5800 mddev->ctime = get_seconds();
5803 mddev->major_version = MD_MAJOR_VERSION;
5804 mddev->minor_version = MD_MINOR_VERSION;
5805 mddev->patch_version = MD_PATCHLEVEL_VERSION;
5806 mddev->ctime = get_seconds();
5808 mddev->level = info->level;
5809 mddev->clevel[0] = 0;
5810 mddev->dev_sectors = 2 * (sector_t)info->size;
5811 mddev->raid_disks = info->raid_disks;
5812 /* don't set md_minor, it is determined by which /dev/md* was
5815 if (info->state & (1<<MD_SB_CLEAN))
5816 mddev->recovery_cp = MaxSector;
5818 mddev->recovery_cp = 0;
5819 mddev->persistent = ! info->not_persistent;
5820 mddev->external = 0;
5822 mddev->layout = info->layout;
5823 mddev->chunk_sectors = info->chunk_size >> 9;
5825 mddev->max_disks = MD_SB_DISKS;
5827 if (mddev->persistent)
5829 set_bit(MD_CHANGE_DEVS, &mddev->flags);
5831 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
5832 mddev->bitmap_info.offset = 0;
5834 mddev->reshape_position = MaxSector;
5837 * Generate a 128 bit UUID
5839 get_random_bytes(mddev->uuid, 16);
5841 mddev->new_level = mddev->level;
5842 mddev->new_chunk_sectors = mddev->chunk_sectors;
5843 mddev->new_layout = mddev->layout;
5844 mddev->delta_disks = 0;
5849 void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors)
5851 WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__);
5853 if (mddev->external_size)
5856 mddev->array_sectors = array_sectors;
5858 EXPORT_SYMBOL(md_set_array_sectors);
5860 static int update_size(struct mddev *mddev, sector_t num_sectors)
5862 struct md_rdev *rdev;
5864 int fit = (num_sectors == 0);
5866 if (mddev->pers->resize == NULL)
5868 /* The "num_sectors" is the number of sectors of each device that
5869 * is used. This can only make sense for arrays with redundancy.
5870 * linear and raid0 always use whatever space is available. We can only
5871 * consider changing this number if no resync or reconstruction is
5872 * happening, and if the new size is acceptable. It must fit before the
5873 * sb_start or, if that is <data_offset, it must fit before the size
5874 * of each device. If num_sectors is zero, we find the largest size
5877 if (mddev->sync_thread)
5880 /* Sorry, cannot grow a bitmap yet, just remove it,
5884 list_for_each_entry(rdev, &mddev->disks, same_set) {
5885 sector_t avail = rdev->sectors;
5887 if (fit && (num_sectors == 0 || num_sectors > avail))
5888 num_sectors = avail;
5889 if (avail < num_sectors)
5892 rv = mddev->pers->resize(mddev, num_sectors);
5894 revalidate_disk(mddev->gendisk);
5898 static int update_raid_disks(struct mddev *mddev, int raid_disks)
5901 /* change the number of raid disks */
5902 if (mddev->pers->check_reshape == NULL)
5904 if (raid_disks <= 0 ||
5905 (mddev->max_disks && raid_disks >= mddev->max_disks))
5907 if (mddev->sync_thread || mddev->reshape_position != MaxSector)
5909 mddev->delta_disks = raid_disks - mddev->raid_disks;
5911 rv = mddev->pers->check_reshape(mddev);
5913 mddev->delta_disks = 0;
5919 * update_array_info is used to change the configuration of an
5921 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
5922 * fields in the info are checked against the array.
5923 * Any differences that cannot be handled will cause an error.
5924 * Normally, only one change can be managed at a time.
5926 static int update_array_info(struct mddev *mddev, mdu_array_info_t *info)
5932 /* calculate expected state,ignoring low bits */
5933 if (mddev->bitmap && mddev->bitmap_info.offset)
5934 state |= (1 << MD_SB_BITMAP_PRESENT);
5936 if (mddev->major_version != info->major_version ||
5937 mddev->minor_version != info->minor_version ||
5938 /* mddev->patch_version != info->patch_version || */
5939 mddev->ctime != info->ctime ||
5940 mddev->level != info->level ||
5941 /* mddev->layout != info->layout || */
5942 !mddev->persistent != info->not_persistent||
5943 mddev->chunk_sectors != info->chunk_size >> 9 ||
5944 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
5945 ((state^info->state) & 0xfffffe00)
5948 /* Check there is only one change */
5949 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
5951 if (mddev->raid_disks != info->raid_disks)
5953 if (mddev->layout != info->layout)
5955 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT))
5962 if (mddev->layout != info->layout) {
5964 * we don't need to do anything at the md level, the
5965 * personality will take care of it all.
5967 if (mddev->pers->check_reshape == NULL)
5970 mddev->new_layout = info->layout;
5971 rv = mddev->pers->check_reshape(mddev);
5973 mddev->new_layout = mddev->layout;
5977 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
5978 rv = update_size(mddev, (sector_t)info->size * 2);
5980 if (mddev->raid_disks != info->raid_disks)
5981 rv = update_raid_disks(mddev, info->raid_disks);
5983 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
5984 if (mddev->pers->quiesce == NULL)
5986 if (mddev->recovery || mddev->sync_thread)
5988 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
5989 /* add the bitmap */
5992 if (mddev->bitmap_info.default_offset == 0)
5994 mddev->bitmap_info.offset =
5995 mddev->bitmap_info.default_offset;
5996 mddev->pers->quiesce(mddev, 1);
5997 rv = bitmap_create(mddev);
5999 rv = bitmap_load(mddev);
6001 bitmap_destroy(mddev);
6002 mddev->pers->quiesce(mddev, 0);
6004 /* remove the bitmap */
6007 if (mddev->bitmap->file)
6009 mddev->pers->quiesce(mddev, 1);
6010 bitmap_destroy(mddev);
6011 mddev->pers->quiesce(mddev, 0);
6012 mddev->bitmap_info.offset = 0;
6015 md_update_sb(mddev, 1);
6019 static int set_disk_faulty(struct mddev *mddev, dev_t dev)
6021 struct md_rdev *rdev;
6023 if (mddev->pers == NULL)
6026 rdev = find_rdev(mddev, dev);
6030 md_error(mddev, rdev);
6031 if (!test_bit(Faulty, &rdev->flags))
6037 * We have a problem here : there is no easy way to give a CHS
6038 * virtual geometry. We currently pretend that we have a 2 heads
6039 * 4 sectors (with a BIG number of cylinders...). This drives
6040 * dosfs just mad... ;-)
6042 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
6044 struct mddev *mddev = bdev->bd_disk->private_data;
6048 geo->cylinders = mddev->array_sectors / 8;
6052 static int md_ioctl(struct block_device *bdev, fmode_t mode,
6053 unsigned int cmd, unsigned long arg)
6056 void __user *argp = (void __user *)arg;
6057 struct mddev *mddev = NULL;
6060 if (!capable(CAP_SYS_ADMIN))
6064 * Commands dealing with the RAID driver but not any
6070 err = get_version(argp);
6073 case PRINT_RAID_DEBUG:
6081 autostart_arrays(arg);
6088 * Commands creating/starting a new array:
6091 mddev = bdev->bd_disk->private_data;
6098 err = mddev_lock(mddev);
6101 "md: ioctl lock interrupted, reason %d, cmd %d\n",
6108 case SET_ARRAY_INFO:
6110 mdu_array_info_t info;
6112 memset(&info, 0, sizeof(info));
6113 else if (copy_from_user(&info, argp, sizeof(info))) {
6118 err = update_array_info(mddev, &info);
6120 printk(KERN_WARNING "md: couldn't update"
6121 " array info. %d\n", err);
6126 if (!list_empty(&mddev->disks)) {
6128 "md: array %s already has disks!\n",
6133 if (mddev->raid_disks) {
6135 "md: array %s already initialised!\n",
6140 err = set_array_info(mddev, &info);
6142 printk(KERN_WARNING "md: couldn't set"
6143 " array info. %d\n", err);
6153 * Commands querying/configuring an existing array:
6155 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
6156 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
6157 if ((!mddev->raid_disks && !mddev->external)
6158 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
6159 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
6160 && cmd != GET_BITMAP_FILE) {
6166 * Commands even a read-only array can execute:
6170 case GET_ARRAY_INFO:
6171 err = get_array_info(mddev, argp);
6174 case GET_BITMAP_FILE:
6175 err = get_bitmap_file(mddev, argp);
6179 err = get_disk_info(mddev, argp);
6182 case RESTART_ARRAY_RW:
6183 err = restart_array(mddev);
6187 err = do_md_stop(mddev, 0, 1);
6191 err = md_set_readonly(mddev, 1);
6195 if (get_user(ro, (int __user *)(arg))) {
6201 /* if the bdev is going readonly the value of mddev->ro
6202 * does not matter, no writes are coming
6207 /* are we are already prepared for writes? */
6211 /* transitioning to readauto need only happen for
6212 * arrays that call md_write_start
6215 err = restart_array(mddev);
6218 set_disk_ro(mddev->gendisk, 0);
6225 * The remaining ioctls are changing the state of the
6226 * superblock, so we do not allow them on read-only arrays.
6227 * However non-MD ioctls (e.g. get-size) will still come through
6228 * here and hit the 'default' below, so only disallow
6229 * 'md' ioctls, and switch to rw mode if started auto-readonly.
6231 if (_IOC_TYPE(cmd) == MD_MAJOR && mddev->ro && mddev->pers) {
6232 if (mddev->ro == 2) {
6234 sysfs_notify_dirent_safe(mddev->sysfs_state);
6235 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6236 md_wakeup_thread(mddev->thread);
6247 mdu_disk_info_t info;
6248 if (copy_from_user(&info, argp, sizeof(info)))
6251 err = add_new_disk(mddev, &info);
6255 case HOT_REMOVE_DISK:
6256 err = hot_remove_disk(mddev, new_decode_dev(arg));
6260 err = hot_add_disk(mddev, new_decode_dev(arg));
6263 case SET_DISK_FAULTY:
6264 err = set_disk_faulty(mddev, new_decode_dev(arg));
6268 err = do_md_run(mddev);
6271 case SET_BITMAP_FILE:
6272 err = set_bitmap_file(mddev, (int)arg);
6282 if (mddev->hold_active == UNTIL_IOCTL &&
6284 mddev->hold_active = 0;
6285 mddev_unlock(mddev);
6294 #ifdef CONFIG_COMPAT
6295 static int md_compat_ioctl(struct block_device *bdev, fmode_t mode,
6296 unsigned int cmd, unsigned long arg)
6299 case HOT_REMOVE_DISK:
6301 case SET_DISK_FAULTY:
6302 case SET_BITMAP_FILE:
6303 /* These take in integer arg, do not convert */
6306 arg = (unsigned long)compat_ptr(arg);
6310 return md_ioctl(bdev, mode, cmd, arg);
6312 #endif /* CONFIG_COMPAT */
6314 static int md_open(struct block_device *bdev, fmode_t mode)
6317 * Succeed if we can lock the mddev, which confirms that
6318 * it isn't being stopped right now.
6320 struct mddev *mddev = mddev_find(bdev->bd_dev);
6323 if (mddev->gendisk != bdev->bd_disk) {
6324 /* we are racing with mddev_put which is discarding this
6328 /* Wait until bdev->bd_disk is definitely gone */
6329 flush_workqueue(md_misc_wq);
6330 /* Then retry the open from the top */
6331 return -ERESTARTSYS;
6333 BUG_ON(mddev != bdev->bd_disk->private_data);
6335 if ((err = mutex_lock_interruptible(&mddev->open_mutex)))
6339 atomic_inc(&mddev->openers);
6340 mutex_unlock(&mddev->open_mutex);
6342 check_disk_change(bdev);
6347 static int md_release(struct gendisk *disk, fmode_t mode)
6349 struct mddev *mddev = disk->private_data;
6352 atomic_dec(&mddev->openers);
6358 static int md_media_changed(struct gendisk *disk)
6360 struct mddev *mddev = disk->private_data;
6362 return mddev->changed;
6365 static int md_revalidate(struct gendisk *disk)
6367 struct mddev *mddev = disk->private_data;
6372 static const struct block_device_operations md_fops =
6374 .owner = THIS_MODULE,
6376 .release = md_release,
6378 #ifdef CONFIG_COMPAT
6379 .compat_ioctl = md_compat_ioctl,
6381 .getgeo = md_getgeo,
6382 .media_changed = md_media_changed,
6383 .revalidate_disk= md_revalidate,
6386 static int md_thread(void * arg)
6388 struct md_thread *thread = arg;
6391 * md_thread is a 'system-thread', it's priority should be very
6392 * high. We avoid resource deadlocks individually in each
6393 * raid personality. (RAID5 does preallocation) We also use RR and
6394 * the very same RT priority as kswapd, thus we will never get
6395 * into a priority inversion deadlock.
6397 * we definitely have to have equal or higher priority than
6398 * bdflush, otherwise bdflush will deadlock if there are too
6399 * many dirty RAID5 blocks.
6402 allow_signal(SIGKILL);
6403 while (!kthread_should_stop()) {
6405 /* We need to wait INTERRUPTIBLE so that
6406 * we don't add to the load-average.
6407 * That means we need to be sure no signals are
6410 if (signal_pending(current))
6411 flush_signals(current);
6413 wait_event_interruptible_timeout
6415 test_bit(THREAD_WAKEUP, &thread->flags)
6416 || kthread_should_stop(),
6419 clear_bit(THREAD_WAKEUP, &thread->flags);
6420 if (!kthread_should_stop())
6421 thread->run(thread->mddev);
6427 void md_wakeup_thread(struct md_thread *thread)
6430 pr_debug("md: waking up MD thread %s.\n", thread->tsk->comm);
6431 set_bit(THREAD_WAKEUP, &thread->flags);
6432 wake_up(&thread->wqueue);
6436 struct md_thread *md_register_thread(void (*run) (struct mddev *), struct mddev *mddev,
6439 struct md_thread *thread;
6441 thread = kzalloc(sizeof(struct md_thread), GFP_KERNEL);
6445 init_waitqueue_head(&thread->wqueue);
6448 thread->mddev = mddev;
6449 thread->timeout = MAX_SCHEDULE_TIMEOUT;
6450 thread->tsk = kthread_run(md_thread, thread,
6452 mdname(thread->mddev),
6453 name ?: mddev->pers->name);
6454 if (IS_ERR(thread->tsk)) {
6461 void md_unregister_thread(struct md_thread **threadp)
6463 struct md_thread *thread = *threadp;
6466 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
6467 /* Locking ensures that mddev_unlock does not wake_up a
6468 * non-existent thread
6470 spin_lock(&pers_lock);
6472 spin_unlock(&pers_lock);
6474 kthread_stop(thread->tsk);
6478 void md_error(struct mddev *mddev, struct md_rdev *rdev)
6485 if (!rdev || test_bit(Faulty, &rdev->flags))
6488 if (!mddev->pers || !mddev->pers->error_handler)
6490 mddev->pers->error_handler(mddev,rdev);
6491 if (mddev->degraded)
6492 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6493 sysfs_notify_dirent_safe(rdev->sysfs_state);
6494 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6495 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6496 md_wakeup_thread(mddev->thread);
6497 if (mddev->event_work.func)
6498 queue_work(md_misc_wq, &mddev->event_work);
6499 md_new_event_inintr(mddev);
6502 /* seq_file implementation /proc/mdstat */
6504 static void status_unused(struct seq_file *seq)
6507 struct md_rdev *rdev;
6509 seq_printf(seq, "unused devices: ");
6511 list_for_each_entry(rdev, &pending_raid_disks, same_set) {
6512 char b[BDEVNAME_SIZE];
6514 seq_printf(seq, "%s ",
6515 bdevname(rdev->bdev,b));
6518 seq_printf(seq, "<none>");
6520 seq_printf(seq, "\n");
6524 static void status_resync(struct seq_file *seq, struct mddev * mddev)
6526 sector_t max_sectors, resync, res;
6527 unsigned long dt, db;
6530 unsigned int per_milli;
6532 resync = mddev->curr_resync - atomic_read(&mddev->recovery_active);
6534 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
6535 max_sectors = mddev->resync_max_sectors;
6537 max_sectors = mddev->dev_sectors;
6540 * Should not happen.
6546 /* Pick 'scale' such that (resync>>scale)*1000 will fit
6547 * in a sector_t, and (max_sectors>>scale) will fit in a
6548 * u32, as those are the requirements for sector_div.
6549 * Thus 'scale' must be at least 10
6552 if (sizeof(sector_t) > sizeof(unsigned long)) {
6553 while ( max_sectors/2 > (1ULL<<(scale+32)))
6556 res = (resync>>scale)*1000;
6557 sector_div(res, (u32)((max_sectors>>scale)+1));
6561 int i, x = per_milli/50, y = 20-x;
6562 seq_printf(seq, "[");
6563 for (i = 0; i < x; i++)
6564 seq_printf(seq, "=");
6565 seq_printf(seq, ">");
6566 for (i = 0; i < y; i++)
6567 seq_printf(seq, ".");
6568 seq_printf(seq, "] ");
6570 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
6571 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
6573 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
6575 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
6576 "resync" : "recovery"))),
6577 per_milli/10, per_milli % 10,
6578 (unsigned long long) resync/2,
6579 (unsigned long long) max_sectors/2);
6582 * dt: time from mark until now
6583 * db: blocks written from mark until now
6584 * rt: remaining time
6586 * rt is a sector_t, so could be 32bit or 64bit.
6587 * So we divide before multiply in case it is 32bit and close
6589 * We scale the divisor (db) by 32 to avoid losing precision
6590 * near the end of resync when the number of remaining sectors
6592 * We then divide rt by 32 after multiplying by db to compensate.
6593 * The '+1' avoids division by zero if db is very small.
6595 dt = ((jiffies - mddev->resync_mark) / HZ);
6597 db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active))
6598 - mddev->resync_mark_cnt;
6600 rt = max_sectors - resync; /* number of remaining sectors */
6601 sector_div(rt, db/32+1);
6605 seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60,
6606 ((unsigned long)rt % 60)/6);
6608 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
6611 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
6613 struct list_head *tmp;
6615 struct mddev *mddev;
6623 spin_lock(&all_mddevs_lock);
6624 list_for_each(tmp,&all_mddevs)
6626 mddev = list_entry(tmp, struct mddev, all_mddevs);
6628 spin_unlock(&all_mddevs_lock);
6631 spin_unlock(&all_mddevs_lock);
6633 return (void*)2;/* tail */
6637 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
6639 struct list_head *tmp;
6640 struct mddev *next_mddev, *mddev = v;
6646 spin_lock(&all_mddevs_lock);
6648 tmp = all_mddevs.next;
6650 tmp = mddev->all_mddevs.next;
6651 if (tmp != &all_mddevs)
6652 next_mddev = mddev_get(list_entry(tmp,struct mddev,all_mddevs));
6654 next_mddev = (void*)2;
6657 spin_unlock(&all_mddevs_lock);
6665 static void md_seq_stop(struct seq_file *seq, void *v)
6667 struct mddev *mddev = v;
6669 if (mddev && v != (void*)1 && v != (void*)2)
6673 static int md_seq_show(struct seq_file *seq, void *v)
6675 struct mddev *mddev = v;
6677 struct md_rdev *rdev;
6678 struct bitmap *bitmap;
6680 if (v == (void*)1) {
6681 struct md_personality *pers;
6682 seq_printf(seq, "Personalities : ");
6683 spin_lock(&pers_lock);
6684 list_for_each_entry(pers, &pers_list, list)
6685 seq_printf(seq, "[%s] ", pers->name);
6687 spin_unlock(&pers_lock);
6688 seq_printf(seq, "\n");
6689 seq->poll_event = atomic_read(&md_event_count);
6692 if (v == (void*)2) {
6697 if (mddev_lock(mddev) < 0)
6700 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
6701 seq_printf(seq, "%s : %sactive", mdname(mddev),
6702 mddev->pers ? "" : "in");
6705 seq_printf(seq, " (read-only)");
6707 seq_printf(seq, " (auto-read-only)");
6708 seq_printf(seq, " %s", mddev->pers->name);
6712 list_for_each_entry(rdev, &mddev->disks, same_set) {
6713 char b[BDEVNAME_SIZE];
6714 seq_printf(seq, " %s[%d]",
6715 bdevname(rdev->bdev,b), rdev->desc_nr);
6716 if (test_bit(WriteMostly, &rdev->flags))
6717 seq_printf(seq, "(W)");
6718 if (test_bit(Faulty, &rdev->flags)) {
6719 seq_printf(seq, "(F)");
6721 } else if (rdev->raid_disk < 0)
6722 seq_printf(seq, "(S)"); /* spare */
6723 sectors += rdev->sectors;
6726 if (!list_empty(&mddev->disks)) {
6728 seq_printf(seq, "\n %llu blocks",
6729 (unsigned long long)
6730 mddev->array_sectors / 2);
6732 seq_printf(seq, "\n %llu blocks",
6733 (unsigned long long)sectors / 2);
6735 if (mddev->persistent) {
6736 if (mddev->major_version != 0 ||
6737 mddev->minor_version != 90) {
6738 seq_printf(seq," super %d.%d",
6739 mddev->major_version,
6740 mddev->minor_version);
6742 } else if (mddev->external)
6743 seq_printf(seq, " super external:%s",
6744 mddev->metadata_type);
6746 seq_printf(seq, " super non-persistent");
6749 mddev->pers->status(seq, mddev);
6750 seq_printf(seq, "\n ");
6751 if (mddev->pers->sync_request) {
6752 if (mddev->curr_resync > 2) {
6753 status_resync(seq, mddev);
6754 seq_printf(seq, "\n ");
6755 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
6756 seq_printf(seq, "\tresync=DELAYED\n ");
6757 else if (mddev->recovery_cp < MaxSector)
6758 seq_printf(seq, "\tresync=PENDING\n ");
6761 seq_printf(seq, "\n ");
6763 if ((bitmap = mddev->bitmap)) {
6764 unsigned long chunk_kb;
6765 unsigned long flags;
6766 spin_lock_irqsave(&bitmap->lock, flags);
6767 chunk_kb = mddev->bitmap_info.chunksize >> 10;
6768 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
6770 bitmap->pages - bitmap->missing_pages,
6772 (bitmap->pages - bitmap->missing_pages)
6773 << (PAGE_SHIFT - 10),
6774 chunk_kb ? chunk_kb : mddev->bitmap_info.chunksize,
6775 chunk_kb ? "KB" : "B");
6777 seq_printf(seq, ", file: ");
6778 seq_path(seq, &bitmap->file->f_path, " \t\n");
6781 seq_printf(seq, "\n");
6782 spin_unlock_irqrestore(&bitmap->lock, flags);
6785 seq_printf(seq, "\n");
6787 mddev_unlock(mddev);
6792 static const struct seq_operations md_seq_ops = {
6793 .start = md_seq_start,
6794 .next = md_seq_next,
6795 .stop = md_seq_stop,
6796 .show = md_seq_show,
6799 static int md_seq_open(struct inode *inode, struct file *file)
6801 struct seq_file *seq;
6804 error = seq_open(file, &md_seq_ops);
6808 seq = file->private_data;
6809 seq->poll_event = atomic_read(&md_event_count);
6813 static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
6815 struct seq_file *seq = filp->private_data;
6818 poll_wait(filp, &md_event_waiters, wait);
6820 /* always allow read */
6821 mask = POLLIN | POLLRDNORM;
6823 if (seq->poll_event != atomic_read(&md_event_count))
6824 mask |= POLLERR | POLLPRI;
6828 static const struct file_operations md_seq_fops = {
6829 .owner = THIS_MODULE,
6830 .open = md_seq_open,
6832 .llseek = seq_lseek,
6833 .release = seq_release_private,
6834 .poll = mdstat_poll,
6837 int register_md_personality(struct md_personality *p)
6839 spin_lock(&pers_lock);
6840 list_add_tail(&p->list, &pers_list);
6841 printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level);
6842 spin_unlock(&pers_lock);
6846 int unregister_md_personality(struct md_personality *p)
6848 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
6849 spin_lock(&pers_lock);
6850 list_del_init(&p->list);
6851 spin_unlock(&pers_lock);
6855 static int is_mddev_idle(struct mddev *mddev, int init)
6857 struct md_rdev * rdev;
6863 rdev_for_each_rcu(rdev, mddev) {
6864 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
6865 curr_events = (int)part_stat_read(&disk->part0, sectors[0]) +
6866 (int)part_stat_read(&disk->part0, sectors[1]) -
6867 atomic_read(&disk->sync_io);
6868 /* sync IO will cause sync_io to increase before the disk_stats
6869 * as sync_io is counted when a request starts, and
6870 * disk_stats is counted when it completes.
6871 * So resync activity will cause curr_events to be smaller than
6872 * when there was no such activity.
6873 * non-sync IO will cause disk_stat to increase without
6874 * increasing sync_io so curr_events will (eventually)
6875 * be larger than it was before. Once it becomes
6876 * substantially larger, the test below will cause
6877 * the array to appear non-idle, and resync will slow
6879 * If there is a lot of outstanding resync activity when
6880 * we set last_event to curr_events, then all that activity
6881 * completing might cause the array to appear non-idle
6882 * and resync will be slowed down even though there might
6883 * not have been non-resync activity. This will only
6884 * happen once though. 'last_events' will soon reflect
6885 * the state where there is little or no outstanding
6886 * resync requests, and further resync activity will
6887 * always make curr_events less than last_events.
6890 if (init || curr_events - rdev->last_events > 64) {
6891 rdev->last_events = curr_events;
6899 void md_done_sync(struct mddev *mddev, int blocks, int ok)
6901 /* another "blocks" (512byte) blocks have been synced */
6902 atomic_sub(blocks, &mddev->recovery_active);
6903 wake_up(&mddev->recovery_wait);
6905 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6906 md_wakeup_thread(mddev->thread);
6907 // stop recovery, signal do_sync ....
6912 /* md_write_start(mddev, bi)
6913 * If we need to update some array metadata (e.g. 'active' flag
6914 * in superblock) before writing, schedule a superblock update
6915 * and wait for it to complete.
6917 void md_write_start(struct mddev *mddev, struct bio *bi)
6920 if (bio_data_dir(bi) != WRITE)
6923 BUG_ON(mddev->ro == 1);
6924 if (mddev->ro == 2) {
6925 /* need to switch to read/write */
6927 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6928 md_wakeup_thread(mddev->thread);
6929 md_wakeup_thread(mddev->sync_thread);
6932 atomic_inc(&mddev->writes_pending);
6933 if (mddev->safemode == 1)
6934 mddev->safemode = 0;
6935 if (mddev->in_sync) {
6936 spin_lock_irq(&mddev->write_lock);
6937 if (mddev->in_sync) {
6939 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6940 set_bit(MD_CHANGE_PENDING, &mddev->flags);
6941 md_wakeup_thread(mddev->thread);
6944 spin_unlock_irq(&mddev->write_lock);
6947 sysfs_notify_dirent_safe(mddev->sysfs_state);
6948 wait_event(mddev->sb_wait,
6949 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
6952 void md_write_end(struct mddev *mddev)
6954 if (atomic_dec_and_test(&mddev->writes_pending)) {
6955 if (mddev->safemode == 2)
6956 md_wakeup_thread(mddev->thread);
6957 else if (mddev->safemode_delay)
6958 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
6962 /* md_allow_write(mddev)
6963 * Calling this ensures that the array is marked 'active' so that writes
6964 * may proceed without blocking. It is important to call this before
6965 * attempting a GFP_KERNEL allocation while holding the mddev lock.
6966 * Must be called with mddev_lock held.
6968 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
6969 * is dropped, so return -EAGAIN after notifying userspace.
6971 int md_allow_write(struct mddev *mddev)
6977 if (!mddev->pers->sync_request)
6980 spin_lock_irq(&mddev->write_lock);
6981 if (mddev->in_sync) {
6983 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6984 set_bit(MD_CHANGE_PENDING, &mddev->flags);
6985 if (mddev->safemode_delay &&
6986 mddev->safemode == 0)
6987 mddev->safemode = 1;
6988 spin_unlock_irq(&mddev->write_lock);
6989 md_update_sb(mddev, 0);
6990 sysfs_notify_dirent_safe(mddev->sysfs_state);
6992 spin_unlock_irq(&mddev->write_lock);
6994 if (test_bit(MD_CHANGE_PENDING, &mddev->flags))
6999 EXPORT_SYMBOL_GPL(md_allow_write);
7001 #define SYNC_MARKS 10
7002 #define SYNC_MARK_STEP (3*HZ)
7003 void md_do_sync(struct mddev *mddev)
7005 struct mddev *mddev2;
7006 unsigned int currspeed = 0,
7008 sector_t max_sectors,j, io_sectors;
7009 unsigned long mark[SYNC_MARKS];
7010 sector_t mark_cnt[SYNC_MARKS];
7012 struct list_head *tmp;
7013 sector_t last_check;
7015 struct md_rdev *rdev;
7018 /* just incase thread restarts... */
7019 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
7021 if (mddev->ro) /* never try to sync a read-only array */
7024 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
7025 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
7026 desc = "data-check";
7027 else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
7028 desc = "requested-resync";
7031 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
7036 /* we overload curr_resync somewhat here.
7037 * 0 == not engaged in resync at all
7038 * 2 == checking that there is no conflict with another sync
7039 * 1 == like 2, but have yielded to allow conflicting resync to
7041 * other == active in resync - this many blocks
7043 * Before starting a resync we must have set curr_resync to
7044 * 2, and then checked that every "conflicting" array has curr_resync
7045 * less than ours. When we find one that is the same or higher
7046 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
7047 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
7048 * This will mean we have to start checking from the beginning again.
7053 mddev->curr_resync = 2;
7056 if (kthread_should_stop())
7057 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7059 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
7061 for_each_mddev(mddev2, tmp) {
7062 if (mddev2 == mddev)
7064 if (!mddev->parallel_resync
7065 && mddev2->curr_resync
7066 && match_mddev_units(mddev, mddev2)) {
7068 if (mddev < mddev2 && mddev->curr_resync == 2) {
7069 /* arbitrarily yield */
7070 mddev->curr_resync = 1;
7071 wake_up(&resync_wait);
7073 if (mddev > mddev2 && mddev->curr_resync == 1)
7074 /* no need to wait here, we can wait the next
7075 * time 'round when curr_resync == 2
7078 /* We need to wait 'interruptible' so as not to
7079 * contribute to the load average, and not to
7080 * be caught by 'softlockup'
7082 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
7083 if (!kthread_should_stop() &&
7084 mddev2->curr_resync >= mddev->curr_resync) {
7085 printk(KERN_INFO "md: delaying %s of %s"
7086 " until %s has finished (they"
7087 " share one or more physical units)\n",
7088 desc, mdname(mddev), mdname(mddev2));
7090 if (signal_pending(current))
7091 flush_signals(current);
7093 finish_wait(&resync_wait, &wq);
7096 finish_wait(&resync_wait, &wq);
7099 } while (mddev->curr_resync < 2);
7102 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
7103 /* resync follows the size requested by the personality,
7104 * which defaults to physical size, but can be virtual size
7106 max_sectors = mddev->resync_max_sectors;
7107 mddev->resync_mismatches = 0;
7108 /* we don't use the checkpoint if there's a bitmap */
7109 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
7110 j = mddev->resync_min;
7111 else if (!mddev->bitmap)
7112 j = mddev->recovery_cp;
7114 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
7115 max_sectors = mddev->dev_sectors;
7117 /* recovery follows the physical size of devices */
7118 max_sectors = mddev->dev_sectors;
7121 list_for_each_entry_rcu(rdev, &mddev->disks, same_set)
7122 if (rdev->raid_disk >= 0 &&
7123 !test_bit(Faulty, &rdev->flags) &&
7124 !test_bit(In_sync, &rdev->flags) &&
7125 rdev->recovery_offset < j)
7126 j = rdev->recovery_offset;
7130 printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev));
7131 printk(KERN_INFO "md: minimum _guaranteed_ speed:"
7132 " %d KB/sec/disk.\n", speed_min(mddev));
7133 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
7134 "(but not more than %d KB/sec) for %s.\n",
7135 speed_max(mddev), desc);
7137 is_mddev_idle(mddev, 1); /* this initializes IO event counters */
7140 for (m = 0; m < SYNC_MARKS; m++) {
7142 mark_cnt[m] = io_sectors;
7145 mddev->resync_mark = mark[last_mark];
7146 mddev->resync_mark_cnt = mark_cnt[last_mark];
7149 * Tune reconstruction:
7151 window = 32*(PAGE_SIZE/512);
7152 printk(KERN_INFO "md: using %dk window, over a total of %lluk.\n",
7153 window/2, (unsigned long long)max_sectors/2);
7155 atomic_set(&mddev->recovery_active, 0);
7160 "md: resuming %s of %s from checkpoint.\n",
7161 desc, mdname(mddev));
7162 mddev->curr_resync = j;
7164 mddev->curr_resync_completed = j;
7166 while (j < max_sectors) {
7171 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
7172 ((mddev->curr_resync > mddev->curr_resync_completed &&
7173 (mddev->curr_resync - mddev->curr_resync_completed)
7174 > (max_sectors >> 4)) ||
7175 (j - mddev->curr_resync_completed)*2
7176 >= mddev->resync_max - mddev->curr_resync_completed
7178 /* time to update curr_resync_completed */
7179 wait_event(mddev->recovery_wait,
7180 atomic_read(&mddev->recovery_active) == 0);
7181 mddev->curr_resync_completed = j;
7182 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
7183 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
7186 while (j >= mddev->resync_max && !kthread_should_stop()) {
7187 /* As this condition is controlled by user-space,
7188 * we can block indefinitely, so use '_interruptible'
7189 * to avoid triggering warnings.
7191 flush_signals(current); /* just in case */
7192 wait_event_interruptible(mddev->recovery_wait,
7193 mddev->resync_max > j
7194 || kthread_should_stop());
7197 if (kthread_should_stop())
7200 sectors = mddev->pers->sync_request(mddev, j, &skipped,
7201 currspeed < speed_min(mddev));
7203 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7207 if (!skipped) { /* actual IO requested */
7208 io_sectors += sectors;
7209 atomic_add(sectors, &mddev->recovery_active);
7212 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
7216 if (j>1) mddev->curr_resync = j;
7217 mddev->curr_mark_cnt = io_sectors;
7218 if (last_check == 0)
7219 /* this is the earliest that rebuild will be
7220 * visible in /proc/mdstat
7222 md_new_event(mddev);
7224 if (last_check + window > io_sectors || j == max_sectors)
7227 last_check = io_sectors;
7229 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
7231 int next = (last_mark+1) % SYNC_MARKS;
7233 mddev->resync_mark = mark[next];
7234 mddev->resync_mark_cnt = mark_cnt[next];
7235 mark[next] = jiffies;
7236 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
7241 if (kthread_should_stop())
7246 * this loop exits only if either when we are slower than
7247 * the 'hard' speed limit, or the system was IO-idle for
7249 * the system might be non-idle CPU-wise, but we only care
7250 * about not overloading the IO subsystem. (things like an
7251 * e2fsck being done on the RAID array should execute fast)
7255 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
7256 /((jiffies-mddev->resync_mark)/HZ +1) +1;
7258 if (currspeed > speed_min(mddev)) {
7259 if ((currspeed > speed_max(mddev)) ||
7260 !is_mddev_idle(mddev, 0)) {
7266 printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc);
7268 * this also signals 'finished resyncing' to md_stop
7271 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
7273 /* tell personality that we are finished */
7274 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
7276 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
7277 mddev->curr_resync > 2) {
7278 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
7279 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
7280 if (mddev->curr_resync >= mddev->recovery_cp) {
7282 "md: checkpointing %s of %s.\n",
7283 desc, mdname(mddev));
7284 mddev->recovery_cp = mddev->curr_resync;
7287 mddev->recovery_cp = MaxSector;
7289 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
7290 mddev->curr_resync = MaxSector;
7292 list_for_each_entry_rcu(rdev, &mddev->disks, same_set)
7293 if (rdev->raid_disk >= 0 &&
7294 mddev->delta_disks >= 0 &&
7295 !test_bit(Faulty, &rdev->flags) &&
7296 !test_bit(In_sync, &rdev->flags) &&
7297 rdev->recovery_offset < mddev->curr_resync)
7298 rdev->recovery_offset = mddev->curr_resync;
7302 set_bit(MD_CHANGE_DEVS, &mddev->flags);
7305 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
7306 /* We completed so min/max setting can be forgotten if used. */
7307 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
7308 mddev->resync_min = 0;
7309 mddev->resync_max = MaxSector;
7310 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
7311 mddev->resync_min = mddev->curr_resync_completed;
7312 mddev->curr_resync = 0;
7313 wake_up(&resync_wait);
7314 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
7315 md_wakeup_thread(mddev->thread);
7320 * got a signal, exit.
7323 "md: md_do_sync() got signal ... exiting\n");
7324 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7328 EXPORT_SYMBOL_GPL(md_do_sync);
7330 static int remove_and_add_spares(struct mddev *mddev)
7332 struct md_rdev *rdev;
7335 mddev->curr_resync_completed = 0;
7337 list_for_each_entry(rdev, &mddev->disks, same_set)
7338 if (rdev->raid_disk >= 0 &&
7339 !test_bit(Blocked, &rdev->flags) &&
7340 (test_bit(Faulty, &rdev->flags) ||
7341 ! test_bit(In_sync, &rdev->flags)) &&
7342 atomic_read(&rdev->nr_pending)==0) {
7343 if (mddev->pers->hot_remove_disk(
7344 mddev, rdev->raid_disk)==0) {
7345 sysfs_unlink_rdev(mddev, rdev);
7346 rdev->raid_disk = -1;
7350 if (mddev->degraded) {
7351 list_for_each_entry(rdev, &mddev->disks, same_set) {
7352 if (rdev->raid_disk >= 0 &&
7353 !test_bit(In_sync, &rdev->flags) &&
7354 !test_bit(Faulty, &rdev->flags))
7356 if (rdev->raid_disk < 0
7357 && !test_bit(Faulty, &rdev->flags)) {
7358 rdev->recovery_offset = 0;
7360 hot_add_disk(mddev, rdev) == 0) {
7361 if (sysfs_link_rdev(mddev, rdev))
7362 /* failure here is OK */;
7364 md_new_event(mddev);
7365 set_bit(MD_CHANGE_DEVS, &mddev->flags);
7373 static void reap_sync_thread(struct mddev *mddev)
7375 struct md_rdev *rdev;
7377 /* resync has finished, collect result */
7378 md_unregister_thread(&mddev->sync_thread);
7379 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
7380 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
7382 /* activate any spares */
7383 if (mddev->pers->spare_active(mddev))
7384 sysfs_notify(&mddev->kobj, NULL,
7387 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
7388 mddev->pers->finish_reshape)
7389 mddev->pers->finish_reshape(mddev);
7391 /* If array is no-longer degraded, then any saved_raid_disk
7392 * information must be scrapped. Also if any device is now
7393 * In_sync we must scrape the saved_raid_disk for that device
7394 * do the superblock for an incrementally recovered device
7397 list_for_each_entry(rdev, &mddev->disks, same_set)
7398 if (!mddev->degraded ||
7399 test_bit(In_sync, &rdev->flags))
7400 rdev->saved_raid_disk = -1;
7402 md_update_sb(mddev, 1);
7403 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7404 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7405 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
7406 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
7407 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
7408 /* flag recovery needed just to double check */
7409 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7410 sysfs_notify_dirent_safe(mddev->sysfs_action);
7411 md_new_event(mddev);
7412 if (mddev->event_work.func)
7413 queue_work(md_misc_wq, &mddev->event_work);
7417 * This routine is regularly called by all per-raid-array threads to
7418 * deal with generic issues like resync and super-block update.
7419 * Raid personalities that don't have a thread (linear/raid0) do not
7420 * need this as they never do any recovery or update the superblock.
7422 * It does not do any resync itself, but rather "forks" off other threads
7423 * to do that as needed.
7424 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
7425 * "->recovery" and create a thread at ->sync_thread.
7426 * When the thread finishes it sets MD_RECOVERY_DONE
7427 * and wakeups up this thread which will reap the thread and finish up.
7428 * This thread also removes any faulty devices (with nr_pending == 0).
7430 * The overall approach is:
7431 * 1/ if the superblock needs updating, update it.
7432 * 2/ If a recovery thread is running, don't do anything else.
7433 * 3/ If recovery has finished, clean up, possibly marking spares active.
7434 * 4/ If there are any faulty devices, remove them.
7435 * 5/ If array is degraded, try to add spares devices
7436 * 6/ If array has spares or is not in-sync, start a resync thread.
7438 void md_check_recovery(struct mddev *mddev)
7440 if (mddev->suspended)
7444 bitmap_daemon_work(mddev);
7446 if (signal_pending(current)) {
7447 if (mddev->pers->sync_request && !mddev->external) {
7448 printk(KERN_INFO "md: %s in immediate safe mode\n",
7450 mddev->safemode = 2;
7452 flush_signals(current);
7455 if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
7458 (mddev->flags & ~ (1<<MD_CHANGE_PENDING)) ||
7459 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
7460 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
7461 (mddev->external == 0 && mddev->safemode == 1) ||
7462 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
7463 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
7467 if (mddev_trylock(mddev)) {
7471 /* Only thing we do on a ro array is remove
7474 struct md_rdev *rdev;
7475 list_for_each_entry(rdev, &mddev->disks, same_set)
7476 if (rdev->raid_disk >= 0 &&
7477 !test_bit(Blocked, &rdev->flags) &&
7478 test_bit(Faulty, &rdev->flags) &&
7479 atomic_read(&rdev->nr_pending)==0) {
7480 if (mddev->pers->hot_remove_disk(
7481 mddev, rdev->raid_disk)==0) {
7482 sysfs_unlink_rdev(mddev, rdev);
7483 rdev->raid_disk = -1;
7486 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7490 if (!mddev->external) {
7492 spin_lock_irq(&mddev->write_lock);
7493 if (mddev->safemode &&
7494 !atomic_read(&mddev->writes_pending) &&
7496 mddev->recovery_cp == MaxSector) {
7499 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
7501 if (mddev->safemode == 1)
7502 mddev->safemode = 0;
7503 spin_unlock_irq(&mddev->write_lock);
7505 sysfs_notify_dirent_safe(mddev->sysfs_state);
7509 md_update_sb(mddev, 0);
7511 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
7512 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
7513 /* resync/recovery still happening */
7514 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7517 if (mddev->sync_thread) {
7518 reap_sync_thread(mddev);
7521 /* Set RUNNING before clearing NEEDED to avoid
7522 * any transients in the value of "sync_action".
7524 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7525 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7526 /* Clear some bits that don't mean anything, but
7529 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
7530 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
7532 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
7534 /* no recovery is running.
7535 * remove any failed drives, then
7536 * add spares if possible.
7537 * Spare are also removed and re-added, to allow
7538 * the personality to fail the re-add.
7541 if (mddev->reshape_position != MaxSector) {
7542 if (mddev->pers->check_reshape == NULL ||
7543 mddev->pers->check_reshape(mddev) != 0)
7544 /* Cannot proceed */
7546 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
7547 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7548 } else if ((spares = remove_and_add_spares(mddev))) {
7549 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7550 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
7551 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
7552 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7553 } else if (mddev->recovery_cp < MaxSector) {
7554 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7555 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7556 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
7557 /* nothing to be done ... */
7560 if (mddev->pers->sync_request) {
7561 if (spares && mddev->bitmap && ! mddev->bitmap->file) {
7562 /* We are adding a device or devices to an array
7563 * which has the bitmap stored on all devices.
7564 * So make sure all bitmap pages get written
7566 bitmap_write_all(mddev->bitmap);
7568 mddev->sync_thread = md_register_thread(md_do_sync,
7571 if (!mddev->sync_thread) {
7572 printk(KERN_ERR "%s: could not start resync"
7575 /* leave the spares where they are, it shouldn't hurt */
7576 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7577 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7578 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
7579 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
7580 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
7582 md_wakeup_thread(mddev->sync_thread);
7583 sysfs_notify_dirent_safe(mddev->sysfs_action);
7584 md_new_event(mddev);
7587 if (!mddev->sync_thread) {
7588 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7589 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
7591 if (mddev->sysfs_action)
7592 sysfs_notify_dirent_safe(mddev->sysfs_action);
7594 mddev_unlock(mddev);
7598 void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev)
7600 sysfs_notify_dirent_safe(rdev->sysfs_state);
7601 wait_event_timeout(rdev->blocked_wait,
7602 !test_bit(Blocked, &rdev->flags) &&
7603 !test_bit(BlockedBadBlocks, &rdev->flags),
7604 msecs_to_jiffies(5000));
7605 rdev_dec_pending(rdev, mddev);
7607 EXPORT_SYMBOL(md_wait_for_blocked_rdev);
7610 /* Bad block management.
7611 * We can record which blocks on each device are 'bad' and so just
7612 * fail those blocks, or that stripe, rather than the whole device.
7613 * Entries in the bad-block table are 64bits wide. This comprises:
7614 * Length of bad-range, in sectors: 0-511 for lengths 1-512
7615 * Start of bad-range, sector offset, 54 bits (allows 8 exbibytes)
7616 * A 'shift' can be set so that larger blocks are tracked and
7617 * consequently larger devices can be covered.
7618 * 'Acknowledged' flag - 1 bit. - the most significant bit.
7620 * Locking of the bad-block table uses a seqlock so md_is_badblock
7621 * might need to retry if it is very unlucky.
7622 * We will sometimes want to check for bad blocks in a bi_end_io function,
7623 * so we use the write_seqlock_irq variant.
7625 * When looking for a bad block we specify a range and want to
7626 * know if any block in the range is bad. So we binary-search
7627 * to the last range that starts at-or-before the given endpoint,
7628 * (or "before the sector after the target range")
7629 * then see if it ends after the given start.
7631 * 0 if there are no known bad blocks in the range
7632 * 1 if there are known bad block which are all acknowledged
7633 * -1 if there are bad blocks which have not yet been acknowledged in metadata.
7634 * plus the start/length of the first bad section we overlap.
7636 int md_is_badblock(struct badblocks *bb, sector_t s, int sectors,
7637 sector_t *first_bad, int *bad_sectors)
7643 sector_t target = s + sectors;
7646 if (bb->shift > 0) {
7647 /* round the start down, and the end up */
7649 target += (1<<bb->shift) - 1;
7650 target >>= bb->shift;
7651 sectors = target - s;
7653 /* 'target' is now the first block after the bad range */
7656 seq = read_seqbegin(&bb->lock);
7660 /* Binary search between lo and hi for 'target'
7661 * i.e. for the last range that starts before 'target'
7663 /* INVARIANT: ranges before 'lo' and at-or-after 'hi'
7664 * are known not to be the last range before target.
7665 * VARIANT: hi-lo is the number of possible
7666 * ranges, and decreases until it reaches 1
7668 while (hi - lo > 1) {
7669 int mid = (lo + hi) / 2;
7670 sector_t a = BB_OFFSET(p[mid]);
7672 /* This could still be the one, earlier ranges
7676 /* This and later ranges are definitely out. */
7679 /* 'lo' might be the last that started before target, but 'hi' isn't */
7681 /* need to check all range that end after 's' to see if
7682 * any are unacknowledged.
7685 BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) {
7686 if (BB_OFFSET(p[lo]) < target) {
7687 /* starts before the end, and finishes after
7688 * the start, so they must overlap
7690 if (rv != -1 && BB_ACK(p[lo]))
7694 *first_bad = BB_OFFSET(p[lo]);
7695 *bad_sectors = BB_LEN(p[lo]);
7701 if (read_seqretry(&bb->lock, seq))
7706 EXPORT_SYMBOL_GPL(md_is_badblock);
7709 * Add a range of bad blocks to the table.
7710 * This might extend the table, or might contract it
7711 * if two adjacent ranges can be merged.
7712 * We binary-search to find the 'insertion' point, then
7713 * decide how best to handle it.
7715 static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors,
7723 /* badblocks are disabled */
7727 /* round the start down, and the end up */
7728 sector_t next = s + sectors;
7730 next += (1<<bb->shift) - 1;
7735 write_seqlock_irq(&bb->lock);
7740 /* Find the last range that starts at-or-before 's' */
7741 while (hi - lo > 1) {
7742 int mid = (lo + hi) / 2;
7743 sector_t a = BB_OFFSET(p[mid]);
7749 if (hi > lo && BB_OFFSET(p[lo]) > s)
7753 /* we found a range that might merge with the start
7756 sector_t a = BB_OFFSET(p[lo]);
7757 sector_t e = a + BB_LEN(p[lo]);
7758 int ack = BB_ACK(p[lo]);
7760 /* Yes, we can merge with a previous range */
7761 if (s == a && s + sectors >= e)
7762 /* new range covers old */
7765 ack = ack && acknowledged;
7767 if (e < s + sectors)
7769 if (e - a <= BB_MAX_LEN) {
7770 p[lo] = BB_MAKE(a, e-a, ack);
7773 /* does not all fit in one range,
7774 * make p[lo] maximal
7776 if (BB_LEN(p[lo]) != BB_MAX_LEN)
7777 p[lo] = BB_MAKE(a, BB_MAX_LEN, ack);
7783 if (sectors && hi < bb->count) {
7784 /* 'hi' points to the first range that starts after 's'.
7785 * Maybe we can merge with the start of that range */
7786 sector_t a = BB_OFFSET(p[hi]);
7787 sector_t e = a + BB_LEN(p[hi]);
7788 int ack = BB_ACK(p[hi]);
7789 if (a <= s + sectors) {
7790 /* merging is possible */
7791 if (e <= s + sectors) {
7796 ack = ack && acknowledged;
7799 if (e - a <= BB_MAX_LEN) {
7800 p[hi] = BB_MAKE(a, e-a, ack);
7803 p[hi] = BB_MAKE(a, BB_MAX_LEN, ack);
7811 if (sectors == 0 && hi < bb->count) {
7812 /* we might be able to combine lo and hi */
7813 /* Note: 's' is at the end of 'lo' */
7814 sector_t a = BB_OFFSET(p[hi]);
7815 int lolen = BB_LEN(p[lo]);
7816 int hilen = BB_LEN(p[hi]);
7817 int newlen = lolen + hilen - (s - a);
7818 if (s >= a && newlen < BB_MAX_LEN) {
7819 /* yes, we can combine them */
7820 int ack = BB_ACK(p[lo]) && BB_ACK(p[hi]);
7821 p[lo] = BB_MAKE(BB_OFFSET(p[lo]), newlen, ack);
7822 memmove(p + hi, p + hi + 1,
7823 (bb->count - hi - 1) * 8);
7828 /* didn't merge (it all).
7829 * Need to add a range just before 'hi' */
7830 if (bb->count >= MD_MAX_BADBLOCKS) {
7831 /* No room for more */
7835 int this_sectors = sectors;
7836 memmove(p + hi + 1, p + hi,
7837 (bb->count - hi) * 8);
7840 if (this_sectors > BB_MAX_LEN)
7841 this_sectors = BB_MAX_LEN;
7842 p[hi] = BB_MAKE(s, this_sectors, acknowledged);
7843 sectors -= this_sectors;
7850 bb->unacked_exist = 1;
7851 write_sequnlock_irq(&bb->lock);
7856 int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
7859 int rv = md_set_badblocks(&rdev->badblocks,
7860 s + rdev->data_offset, sectors, acknowledged);
7862 /* Make sure they get written out promptly */
7863 sysfs_notify_dirent_safe(rdev->sysfs_state);
7864 set_bit(MD_CHANGE_CLEAN, &rdev->mddev->flags);
7865 md_wakeup_thread(rdev->mddev->thread);
7869 EXPORT_SYMBOL_GPL(rdev_set_badblocks);
7872 * Remove a range of bad blocks from the table.
7873 * This may involve extending the table if we spilt a region,
7874 * but it must not fail. So if the table becomes full, we just
7875 * drop the remove request.
7877 static int md_clear_badblocks(struct badblocks *bb, sector_t s, int sectors)
7881 sector_t target = s + sectors;
7884 if (bb->shift > 0) {
7885 /* When clearing we round the start up and the end down.
7886 * This should not matter as the shift should align with
7887 * the block size and no rounding should ever be needed.
7888 * However it is better the think a block is bad when it
7889 * isn't than to think a block is not bad when it is.
7891 s += (1<<bb->shift) - 1;
7893 target >>= bb->shift;
7894 sectors = target - s;
7897 write_seqlock_irq(&bb->lock);
7902 /* Find the last range that starts before 'target' */
7903 while (hi - lo > 1) {
7904 int mid = (lo + hi) / 2;
7905 sector_t a = BB_OFFSET(p[mid]);
7912 /* p[lo] is the last range that could overlap the
7913 * current range. Earlier ranges could also overlap,
7914 * but only this one can overlap the end of the range.
7916 if (BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > target) {
7917 /* Partial overlap, leave the tail of this range */
7918 int ack = BB_ACK(p[lo]);
7919 sector_t a = BB_OFFSET(p[lo]);
7920 sector_t end = a + BB_LEN(p[lo]);
7923 /* we need to split this range */
7924 if (bb->count >= MD_MAX_BADBLOCKS) {
7928 memmove(p+lo+1, p+lo, (bb->count - lo) * 8);
7930 p[lo] = BB_MAKE(a, s-a, ack);
7933 p[lo] = BB_MAKE(target, end - target, ack);
7934 /* there is no longer an overlap */
7939 BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) {
7940 /* This range does overlap */
7941 if (BB_OFFSET(p[lo]) < s) {
7942 /* Keep the early parts of this range. */
7943 int ack = BB_ACK(p[lo]);
7944 sector_t start = BB_OFFSET(p[lo]);
7945 p[lo] = BB_MAKE(start, s - start, ack);
7946 /* now low doesn't overlap, so.. */
7951 /* 'lo' is strictly before, 'hi' is strictly after,
7952 * anything between needs to be discarded
7955 memmove(p+lo+1, p+hi, (bb->count - hi) * 8);
7956 bb->count -= (hi - lo - 1);
7962 write_sequnlock_irq(&bb->lock);
7966 int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors)
7968 return md_clear_badblocks(&rdev->badblocks,
7969 s + rdev->data_offset,
7972 EXPORT_SYMBOL_GPL(rdev_clear_badblocks);
7975 * Acknowledge all bad blocks in a list.
7976 * This only succeeds if ->changed is clear. It is used by
7977 * in-kernel metadata updates
7979 void md_ack_all_badblocks(struct badblocks *bb)
7981 if (bb->page == NULL || bb->changed)
7982 /* no point even trying */
7984 write_seqlock_irq(&bb->lock);
7986 if (bb->changed == 0) {
7989 for (i = 0; i < bb->count ; i++) {
7990 if (!BB_ACK(p[i])) {
7991 sector_t start = BB_OFFSET(p[i]);
7992 int len = BB_LEN(p[i]);
7993 p[i] = BB_MAKE(start, len, 1);
7996 bb->unacked_exist = 0;
7998 write_sequnlock_irq(&bb->lock);
8000 EXPORT_SYMBOL_GPL(md_ack_all_badblocks);
8002 /* sysfs access to bad-blocks list.
8003 * We present two files.
8004 * 'bad-blocks' lists sector numbers and lengths of ranges that
8005 * are recorded as bad. The list is truncated to fit within
8006 * the one-page limit of sysfs.
8007 * Writing "sector length" to this file adds an acknowledged
8009 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
8010 * been acknowledged. Writing to this file adds bad blocks
8011 * without acknowledging them. This is largely for testing.
8015 badblocks_show(struct badblocks *bb, char *page, int unack)
8026 seq = read_seqbegin(&bb->lock);
8031 while (len < PAGE_SIZE && i < bb->count) {
8032 sector_t s = BB_OFFSET(p[i]);
8033 unsigned int length = BB_LEN(p[i]);
8034 int ack = BB_ACK(p[i]);
8040 len += snprintf(page+len, PAGE_SIZE-len, "%llu %u\n",
8041 (unsigned long long)s << bb->shift,
8042 length << bb->shift);
8044 if (unack && len == 0)
8045 bb->unacked_exist = 0;
8047 if (read_seqretry(&bb->lock, seq))
8056 badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack)
8058 unsigned long long sector;
8062 /* Allow clearing via sysfs *only* for testing/debugging.
8063 * Normally only a successful write may clear a badblock
8066 if (page[0] == '-') {
8070 #endif /* DO_DEBUG */
8072 switch (sscanf(page, "%llu %d%c", §or, &length, &newline)) {
8074 if (newline != '\n')
8086 md_clear_badblocks(bb, sector, length);
8089 #endif /* DO_DEBUG */
8090 if (md_set_badblocks(bb, sector, length, !unack))
8096 static int md_notify_reboot(struct notifier_block *this,
8097 unsigned long code, void *x)
8099 struct list_head *tmp;
8100 struct mddev *mddev;
8103 for_each_mddev(mddev, tmp) {
8104 if (mddev_trylock(mddev)) {
8106 __md_stop_writes(mddev);
8107 mddev->safemode = 2;
8108 mddev_unlock(mddev);
8113 * certain more exotic SCSI devices are known to be
8114 * volatile wrt too early system reboots. While the
8115 * right place to handle this issue is the given
8116 * driver, we do want to have a safe RAID driver ...
8124 static struct notifier_block md_notifier = {
8125 .notifier_call = md_notify_reboot,
8127 .priority = INT_MAX, /* before any real devices */
8130 static void md_geninit(void)
8132 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
8134 proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops);
8137 static int __init md_init(void)
8141 md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0);
8145 md_misc_wq = alloc_workqueue("md_misc", 0, 0);
8149 if ((ret = register_blkdev(MD_MAJOR, "md")) < 0)
8152 if ((ret = register_blkdev(0, "mdp")) < 0)
8156 blk_register_region(MKDEV(MD_MAJOR, 0), 1UL<<MINORBITS, THIS_MODULE,
8157 md_probe, NULL, NULL);
8158 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
8159 md_probe, NULL, NULL);
8161 register_reboot_notifier(&md_notifier);
8162 raid_table_header = register_sysctl_table(raid_root_table);
8168 unregister_blkdev(MD_MAJOR, "md");
8170 destroy_workqueue(md_misc_wq);
8172 destroy_workqueue(md_wq);
8180 * Searches all registered partitions for autorun RAID arrays
8184 static LIST_HEAD(all_detected_devices);
8185 struct detected_devices_node {
8186 struct list_head list;
8190 void md_autodetect_dev(dev_t dev)
8192 struct detected_devices_node *node_detected_dev;
8194 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
8195 if (node_detected_dev) {
8196 node_detected_dev->dev = dev;
8197 list_add_tail(&node_detected_dev->list, &all_detected_devices);
8199 printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed"
8200 ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev));
8205 static void autostart_arrays(int part)
8207 struct md_rdev *rdev;
8208 struct detected_devices_node *node_detected_dev;
8210 int i_scanned, i_passed;
8215 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
8217 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
8219 node_detected_dev = list_entry(all_detected_devices.next,
8220 struct detected_devices_node, list);
8221 list_del(&node_detected_dev->list);
8222 dev = node_detected_dev->dev;
8223 kfree(node_detected_dev);
8224 rdev = md_import_device(dev,0, 90);
8228 if (test_bit(Faulty, &rdev->flags)) {
8232 set_bit(AutoDetected, &rdev->flags);
8233 list_add(&rdev->same_set, &pending_raid_disks);
8237 printk(KERN_INFO "md: Scanned %d and added %d devices.\n",
8238 i_scanned, i_passed);
8240 autorun_devices(part);
8243 #endif /* !MODULE */
8245 static __exit void md_exit(void)
8247 struct mddev *mddev;
8248 struct list_head *tmp;
8250 blk_unregister_region(MKDEV(MD_MAJOR,0), 1U << MINORBITS);
8251 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
8253 unregister_blkdev(MD_MAJOR,"md");
8254 unregister_blkdev(mdp_major, "mdp");
8255 unregister_reboot_notifier(&md_notifier);
8256 unregister_sysctl_table(raid_table_header);
8257 remove_proc_entry("mdstat", NULL);
8258 for_each_mddev(mddev, tmp) {
8259 export_array(mddev);
8260 mddev->hold_active = 0;
8262 destroy_workqueue(md_misc_wq);
8263 destroy_workqueue(md_wq);
8266 subsys_initcall(md_init);
8267 module_exit(md_exit)
8269 static int get_ro(char *buffer, struct kernel_param *kp)
8271 return sprintf(buffer, "%d", start_readonly);
8273 static int set_ro(const char *val, struct kernel_param *kp)
8276 int num = simple_strtoul(val, &e, 10);
8277 if (*val && (*e == '\0' || *e == '\n')) {
8278 start_readonly = num;
8284 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
8285 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
8287 module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR);
8289 EXPORT_SYMBOL(register_md_personality);
8290 EXPORT_SYMBOL(unregister_md_personality);
8291 EXPORT_SYMBOL(md_error);
8292 EXPORT_SYMBOL(md_done_sync);
8293 EXPORT_SYMBOL(md_write_start);
8294 EXPORT_SYMBOL(md_write_end);
8295 EXPORT_SYMBOL(md_register_thread);
8296 EXPORT_SYMBOL(md_unregister_thread);
8297 EXPORT_SYMBOL(md_wakeup_thread);
8298 EXPORT_SYMBOL(md_check_recovery);
8299 MODULE_LICENSE("GPL");
8300 MODULE_DESCRIPTION("MD RAID framework");
8302 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);