2 md.c : Multiple Devices driver for Linux
3 Copyright (C) 1998, 1999, 2000 Ingo Molnar
5 completely rewritten, based on the MD driver code from Marc Zyngier
9 - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar
10 - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com>
11 - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net>
12 - kerneld support by Boris Tobotras <boris@xtalk.msk.su>
13 - kmod support by: Cyrus Durgin
14 - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com>
15 - Devfs support by Richard Gooch <rgooch@atnf.csiro.au>
17 - lots of fixes and improvements to the RAID1/RAID5 and generic
18 RAID code (such as request based resynchronization):
20 Neil Brown <neilb@cse.unsw.edu.au>.
22 - persistent bitmap code
23 Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.
25 This program is free software; you can redistribute it and/or modify
26 it under the terms of the GNU General Public License as published by
27 the Free Software Foundation; either version 2, or (at your option)
30 You should have received a copy of the GNU General Public License
31 (for example /usr/src/linux/COPYING); if not, write to the Free
32 Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
35 #include <linux/kthread.h>
36 #include <linux/blkdev.h>
37 #include <linux/sysctl.h>
38 #include <linux/seq_file.h>
40 #include <linux/poll.h>
41 #include <linux/ctype.h>
42 #include <linux/string.h>
43 #include <linux/hdreg.h>
44 #include <linux/proc_fs.h>
45 #include <linux/random.h>
46 #include <linux/module.h>
47 #include <linux/reboot.h>
48 #include <linux/file.h>
49 #include <linux/compat.h>
50 #include <linux/delay.h>
51 #include <linux/raid/md_p.h>
52 #include <linux/raid/md_u.h>
53 #include <linux/slab.h>
58 static void autostart_arrays(int part);
61 /* pers_list is a list of registered personalities protected
63 * pers_lock does extra service to protect accesses to
64 * mddev->thread when the mutex cannot be held.
66 static LIST_HEAD(pers_list);
67 static DEFINE_SPINLOCK(pers_lock);
69 static void md_print_devices(void);
71 static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
72 static struct workqueue_struct *md_wq;
73 static struct workqueue_struct *md_misc_wq;
75 #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
78 * Default number of read corrections we'll attempt on an rdev
79 * before ejecting it from the array. We divide the read error
80 * count by 2 for every hour elapsed between read errors.
82 #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
84 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
85 * is 1000 KB/sec, so the extra system load does not show up that much.
86 * Increase it if you want to have more _guaranteed_ speed. Note that
87 * the RAID driver will use the maximum available bandwidth if the IO
88 * subsystem is idle. There is also an 'absolute maximum' reconstruction
89 * speed limit - in case reconstruction slows down your system despite
92 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
93 * or /sys/block/mdX/md/sync_speed_{min,max}
96 static int sysctl_speed_limit_min = 1000;
97 static int sysctl_speed_limit_max = 200000;
98 static inline int speed_min(struct mddev *mddev)
100 return mddev->sync_speed_min ?
101 mddev->sync_speed_min : sysctl_speed_limit_min;
104 static inline int speed_max(struct mddev *mddev)
106 return mddev->sync_speed_max ?
107 mddev->sync_speed_max : sysctl_speed_limit_max;
110 static struct ctl_table_header *raid_table_header;
112 static ctl_table raid_table[] = {
114 .procname = "speed_limit_min",
115 .data = &sysctl_speed_limit_min,
116 .maxlen = sizeof(int),
117 .mode = S_IRUGO|S_IWUSR,
118 .proc_handler = proc_dointvec,
121 .procname = "speed_limit_max",
122 .data = &sysctl_speed_limit_max,
123 .maxlen = sizeof(int),
124 .mode = S_IRUGO|S_IWUSR,
125 .proc_handler = proc_dointvec,
130 static ctl_table raid_dir_table[] = {
134 .mode = S_IRUGO|S_IXUGO,
140 static ctl_table raid_root_table[] = {
145 .child = raid_dir_table,
150 static const struct block_device_operations md_fops;
152 static int start_readonly;
155 * like bio_clone, but with a local bio set
158 static void mddev_bio_destructor(struct bio *bio)
160 struct mddev *mddev, **mddevp;
165 bio_free(bio, mddev->bio_set);
168 struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs,
172 struct mddev **mddevp;
174 if (!mddev || !mddev->bio_set)
175 return bio_alloc(gfp_mask, nr_iovecs);
177 b = bio_alloc_bioset(gfp_mask, nr_iovecs,
183 b->bi_destructor = mddev_bio_destructor;
186 EXPORT_SYMBOL_GPL(bio_alloc_mddev);
188 struct bio *bio_clone_mddev(struct bio *bio, gfp_t gfp_mask,
192 struct mddev **mddevp;
194 if (!mddev || !mddev->bio_set)
195 return bio_clone(bio, gfp_mask);
197 b = bio_alloc_bioset(gfp_mask, bio->bi_max_vecs,
203 b->bi_destructor = mddev_bio_destructor;
205 if (bio_integrity(bio)) {
208 ret = bio_integrity_clone(b, bio, gfp_mask, mddev->bio_set);
218 EXPORT_SYMBOL_GPL(bio_clone_mddev);
220 void md_trim_bio(struct bio *bio, int offset, int size)
222 /* 'bio' is a cloned bio which we need to trim to match
223 * the given offset and size.
224 * This requires adjusting bi_sector, bi_size, and bi_io_vec
227 struct bio_vec *bvec;
231 if (offset == 0 && size == bio->bi_size)
234 bio->bi_sector += offset;
237 clear_bit(BIO_SEG_VALID, &bio->bi_flags);
239 while (bio->bi_idx < bio->bi_vcnt &&
240 bio->bi_io_vec[bio->bi_idx].bv_len <= offset) {
241 /* remove this whole bio_vec */
242 offset -= bio->bi_io_vec[bio->bi_idx].bv_len;
245 if (bio->bi_idx < bio->bi_vcnt) {
246 bio->bi_io_vec[bio->bi_idx].bv_offset += offset;
247 bio->bi_io_vec[bio->bi_idx].bv_len -= offset;
249 /* avoid any complications with bi_idx being non-zero*/
251 memmove(bio->bi_io_vec, bio->bi_io_vec+bio->bi_idx,
252 (bio->bi_vcnt - bio->bi_idx) * sizeof(struct bio_vec));
253 bio->bi_vcnt -= bio->bi_idx;
256 /* Make sure vcnt and last bv are not too big */
257 bio_for_each_segment(bvec, bio, i) {
258 if (sofar + bvec->bv_len > size)
259 bvec->bv_len = size - sofar;
260 if (bvec->bv_len == 0) {
264 sofar += bvec->bv_len;
267 EXPORT_SYMBOL_GPL(md_trim_bio);
270 * We have a system wide 'event count' that is incremented
271 * on any 'interesting' event, and readers of /proc/mdstat
272 * can use 'poll' or 'select' to find out when the event
276 * start array, stop array, error, add device, remove device,
277 * start build, activate spare
279 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
280 static atomic_t md_event_count;
281 void md_new_event(struct mddev *mddev)
283 atomic_inc(&md_event_count);
284 wake_up(&md_event_waiters);
286 EXPORT_SYMBOL_GPL(md_new_event);
288 /* Alternate version that can be called from interrupts
289 * when calling sysfs_notify isn't needed.
291 static void md_new_event_inintr(struct mddev *mddev)
293 atomic_inc(&md_event_count);
294 wake_up(&md_event_waiters);
298 * Enables to iterate over all existing md arrays
299 * all_mddevs_lock protects this list.
301 static LIST_HEAD(all_mddevs);
302 static DEFINE_SPINLOCK(all_mddevs_lock);
306 * iterates through all used mddevs in the system.
307 * We take care to grab the all_mddevs_lock whenever navigating
308 * the list, and to always hold a refcount when unlocked.
309 * Any code which breaks out of this loop while own
310 * a reference to the current mddev and must mddev_put it.
312 #define for_each_mddev(_mddev,_tmp) \
314 for (({ spin_lock(&all_mddevs_lock); \
315 _tmp = all_mddevs.next; \
317 ({ if (_tmp != &all_mddevs) \
318 mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\
319 spin_unlock(&all_mddevs_lock); \
320 if (_mddev) mddev_put(_mddev); \
321 _mddev = list_entry(_tmp, struct mddev, all_mddevs); \
322 _tmp != &all_mddevs;}); \
323 ({ spin_lock(&all_mddevs_lock); \
324 _tmp = _tmp->next;}) \
328 /* Rather than calling directly into the personality make_request function,
329 * IO requests come here first so that we can check if the device is
330 * being suspended pending a reconfiguration.
331 * We hold a refcount over the call to ->make_request. By the time that
332 * call has finished, the bio has been linked into some internal structure
333 * and so is visible to ->quiesce(), so we don't need the refcount any more.
335 static void md_make_request(struct request_queue *q, struct bio *bio)
337 const int rw = bio_data_dir(bio);
338 struct mddev *mddev = q->queuedata;
340 unsigned int sectors;
342 if (mddev == NULL || mddev->pers == NULL
347 smp_rmb(); /* Ensure implications of 'active' are visible */
349 if (mddev->suspended) {
352 prepare_to_wait(&mddev->sb_wait, &__wait,
353 TASK_UNINTERRUPTIBLE);
354 if (!mddev->suspended)
360 finish_wait(&mddev->sb_wait, &__wait);
362 atomic_inc(&mddev->active_io);
366 * save the sectors now since our bio can
367 * go away inside make_request
369 sectors = bio_sectors(bio);
370 mddev->pers->make_request(mddev, bio);
372 cpu = part_stat_lock();
373 part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]);
374 part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw], sectors);
377 if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended)
378 wake_up(&mddev->sb_wait);
381 /* mddev_suspend makes sure no new requests are submitted
382 * to the device, and that any requests that have been submitted
383 * are completely handled.
384 * Once ->stop is called and completes, the module will be completely
387 void mddev_suspend(struct mddev *mddev)
389 BUG_ON(mddev->suspended);
390 mddev->suspended = 1;
392 wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0);
393 mddev->pers->quiesce(mddev, 1);
395 del_timer_sync(&mddev->safemode_timer);
397 EXPORT_SYMBOL_GPL(mddev_suspend);
399 void mddev_resume(struct mddev *mddev)
401 mddev->suspended = 0;
402 wake_up(&mddev->sb_wait);
403 mddev->pers->quiesce(mddev, 0);
405 md_wakeup_thread(mddev->thread);
406 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
408 EXPORT_SYMBOL_GPL(mddev_resume);
410 int mddev_congested(struct mddev *mddev, int bits)
412 return mddev->suspended;
414 EXPORT_SYMBOL(mddev_congested);
417 * Generic flush handling for md
420 static void md_end_flush(struct bio *bio, int err)
422 struct md_rdev *rdev = bio->bi_private;
423 struct mddev *mddev = rdev->mddev;
425 rdev_dec_pending(rdev, mddev);
427 if (atomic_dec_and_test(&mddev->flush_pending)) {
428 /* The pre-request flush has finished */
429 queue_work(md_wq, &mddev->flush_work);
434 static void md_submit_flush_data(struct work_struct *ws);
436 static void submit_flushes(struct work_struct *ws)
438 struct mddev *mddev = container_of(ws, struct mddev, flush_work);
439 struct md_rdev *rdev;
441 INIT_WORK(&mddev->flush_work, md_submit_flush_data);
442 atomic_set(&mddev->flush_pending, 1);
444 rdev_for_each_rcu(rdev, mddev)
445 if (rdev->raid_disk >= 0 &&
446 !test_bit(Faulty, &rdev->flags)) {
447 /* Take two references, one is dropped
448 * when request finishes, one after
449 * we reclaim rcu_read_lock
452 atomic_inc(&rdev->nr_pending);
453 atomic_inc(&rdev->nr_pending);
455 bi = bio_alloc_mddev(GFP_NOIO, 0, mddev);
456 bi->bi_end_io = md_end_flush;
457 bi->bi_private = rdev;
458 bi->bi_bdev = rdev->bdev;
459 atomic_inc(&mddev->flush_pending);
460 submit_bio(WRITE_FLUSH, bi);
462 rdev_dec_pending(rdev, mddev);
465 if (atomic_dec_and_test(&mddev->flush_pending))
466 queue_work(md_wq, &mddev->flush_work);
469 static void md_submit_flush_data(struct work_struct *ws)
471 struct mddev *mddev = container_of(ws, struct mddev, flush_work);
472 struct bio *bio = mddev->flush_bio;
474 if (bio->bi_size == 0)
475 /* an empty barrier - all done */
478 bio->bi_rw &= ~REQ_FLUSH;
479 mddev->pers->make_request(mddev, bio);
482 mddev->flush_bio = NULL;
483 wake_up(&mddev->sb_wait);
486 void md_flush_request(struct mddev *mddev, struct bio *bio)
488 spin_lock_irq(&mddev->write_lock);
489 wait_event_lock_irq(mddev->sb_wait,
491 mddev->write_lock, /*nothing*/);
492 mddev->flush_bio = bio;
493 spin_unlock_irq(&mddev->write_lock);
495 INIT_WORK(&mddev->flush_work, submit_flushes);
496 queue_work(md_wq, &mddev->flush_work);
498 EXPORT_SYMBOL(md_flush_request);
500 /* Support for plugging.
501 * This mirrors the plugging support in request_queue, but does not
502 * require having a whole queue or request structures.
503 * We allocate an md_plug_cb for each md device and each thread it gets
504 * plugged on. This links tot the private plug_handle structure in the
505 * personality data where we keep a count of the number of outstanding
506 * plugs so other code can see if a plug is active.
509 struct blk_plug_cb cb;
513 static void plugger_unplug(struct blk_plug_cb *cb)
515 struct md_plug_cb *mdcb = container_of(cb, struct md_plug_cb, cb);
516 if (atomic_dec_and_test(&mdcb->mddev->plug_cnt))
517 md_wakeup_thread(mdcb->mddev->thread);
521 /* Check that an unplug wakeup will come shortly.
522 * If not, wakeup the md thread immediately
524 int mddev_check_plugged(struct mddev *mddev)
526 struct blk_plug *plug = current->plug;
527 struct md_plug_cb *mdcb;
532 list_for_each_entry(mdcb, &plug->cb_list, cb.list) {
533 if (mdcb->cb.callback == plugger_unplug &&
534 mdcb->mddev == mddev) {
535 /* Already on the list, move to top */
536 if (mdcb != list_first_entry(&plug->cb_list,
539 list_move(&mdcb->cb.list, &plug->cb_list);
543 /* Not currently on the callback list */
544 mdcb = kmalloc(sizeof(*mdcb), GFP_ATOMIC);
549 mdcb->cb.callback = plugger_unplug;
550 atomic_inc(&mddev->plug_cnt);
551 list_add(&mdcb->cb.list, &plug->cb_list);
554 EXPORT_SYMBOL_GPL(mddev_check_plugged);
556 static inline struct mddev *mddev_get(struct mddev *mddev)
558 atomic_inc(&mddev->active);
562 static void mddev_delayed_delete(struct work_struct *ws);
564 static void mddev_put(struct mddev *mddev)
566 struct bio_set *bs = NULL;
568 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
570 if (!mddev->raid_disks && list_empty(&mddev->disks) &&
571 mddev->ctime == 0 && !mddev->hold_active) {
572 /* Array is not configured at all, and not held active,
574 list_del_init(&mddev->all_mddevs);
576 mddev->bio_set = NULL;
577 if (mddev->gendisk) {
578 /* We did a probe so need to clean up. Call
579 * queue_work inside the spinlock so that
580 * flush_workqueue() after mddev_find will
581 * succeed in waiting for the work to be done.
583 INIT_WORK(&mddev->del_work, mddev_delayed_delete);
584 queue_work(md_misc_wq, &mddev->del_work);
588 spin_unlock(&all_mddevs_lock);
593 void mddev_init(struct mddev *mddev)
595 mutex_init(&mddev->open_mutex);
596 mutex_init(&mddev->reconfig_mutex);
597 mutex_init(&mddev->bitmap_info.mutex);
598 INIT_LIST_HEAD(&mddev->disks);
599 INIT_LIST_HEAD(&mddev->all_mddevs);
600 init_timer(&mddev->safemode_timer);
601 atomic_set(&mddev->active, 1);
602 atomic_set(&mddev->openers, 0);
603 atomic_set(&mddev->active_io, 0);
604 atomic_set(&mddev->plug_cnt, 0);
605 spin_lock_init(&mddev->write_lock);
606 atomic_set(&mddev->flush_pending, 0);
607 init_waitqueue_head(&mddev->sb_wait);
608 init_waitqueue_head(&mddev->recovery_wait);
609 mddev->reshape_position = MaxSector;
610 mddev->reshape_backwards = 0;
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 rdev_for_each(rdev, mddev)
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 rdev_for_each(rdev, mddev)
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 void md_rdev_clear(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;
819 kfree(rdev->badblocks.page);
820 rdev->badblocks.page = NULL;
822 EXPORT_SYMBOL_GPL(md_rdev_clear);
824 static void super_written(struct bio *bio, int error)
826 struct md_rdev *rdev = bio->bi_private;
827 struct mddev *mddev = rdev->mddev;
829 if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) {
830 printk("md: super_written gets error=%d, uptodate=%d\n",
831 error, test_bit(BIO_UPTODATE, &bio->bi_flags));
832 WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags));
833 md_error(mddev, rdev);
836 if (atomic_dec_and_test(&mddev->pending_writes))
837 wake_up(&mddev->sb_wait);
841 void md_super_write(struct mddev *mddev, struct md_rdev *rdev,
842 sector_t sector, int size, struct page *page)
844 /* write first size bytes of page to sector of rdev
845 * Increment mddev->pending_writes before returning
846 * and decrement it on completion, waking up sb_wait
847 * if zero is reached.
848 * If an error occurred, call md_error
850 struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, mddev);
852 bio->bi_bdev = rdev->meta_bdev ? rdev->meta_bdev : rdev->bdev;
853 bio->bi_sector = sector;
854 bio_add_page(bio, page, size, 0);
855 bio->bi_private = rdev;
856 bio->bi_end_io = super_written;
858 atomic_inc(&mddev->pending_writes);
859 submit_bio(WRITE_FLUSH_FUA, bio);
862 void md_super_wait(struct mddev *mddev)
864 /* wait for all superblock writes that were scheduled to complete */
867 prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE);
868 if (atomic_read(&mddev->pending_writes)==0)
872 finish_wait(&mddev->sb_wait, &wq);
875 static void bi_complete(struct bio *bio, int error)
877 complete((struct completion*)bio->bi_private);
880 int sync_page_io(struct md_rdev *rdev, sector_t sector, int size,
881 struct page *page, int rw, bool metadata_op)
883 struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, rdev->mddev);
884 struct completion event;
889 bio->bi_bdev = (metadata_op && rdev->meta_bdev) ?
890 rdev->meta_bdev : rdev->bdev;
892 bio->bi_sector = sector + rdev->sb_start;
893 else if (rdev->mddev->reshape_position != MaxSector &&
894 (rdev->mddev->reshape_backwards ==
895 (sector >= rdev->mddev->reshape_position)))
896 bio->bi_sector = sector + rdev->new_data_offset;
898 bio->bi_sector = sector + rdev->data_offset;
899 bio_add_page(bio, page, size, 0);
900 init_completion(&event);
901 bio->bi_private = &event;
902 bio->bi_end_io = bi_complete;
904 wait_for_completion(&event);
906 ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
910 EXPORT_SYMBOL_GPL(sync_page_io);
912 static int read_disk_sb(struct md_rdev * rdev, int size)
914 char b[BDEVNAME_SIZE];
915 if (!rdev->sb_page) {
923 if (!sync_page_io(rdev, 0, size, rdev->sb_page, READ, true))
929 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
930 bdevname(rdev->bdev,b));
934 static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
936 return sb1->set_uuid0 == sb2->set_uuid0 &&
937 sb1->set_uuid1 == sb2->set_uuid1 &&
938 sb1->set_uuid2 == sb2->set_uuid2 &&
939 sb1->set_uuid3 == sb2->set_uuid3;
942 static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
945 mdp_super_t *tmp1, *tmp2;
947 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
948 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
950 if (!tmp1 || !tmp2) {
952 printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n");
960 * nr_disks is not constant
965 ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0);
973 static u32 md_csum_fold(u32 csum)
975 csum = (csum & 0xffff) + (csum >> 16);
976 return (csum & 0xffff) + (csum >> 16);
979 static unsigned int calc_sb_csum(mdp_super_t * sb)
982 u32 *sb32 = (u32*)sb;
984 unsigned int disk_csum, csum;
986 disk_csum = sb->sb_csum;
989 for (i = 0; i < MD_SB_BYTES/4 ; i++)
991 csum = (newcsum & 0xffffffff) + (newcsum>>32);
995 /* This used to use csum_partial, which was wrong for several
996 * reasons including that different results are returned on
997 * different architectures. It isn't critical that we get exactly
998 * the same return value as before (we always csum_fold before
999 * testing, and that removes any differences). However as we
1000 * know that csum_partial always returned a 16bit value on
1001 * alphas, do a fold to maximise conformity to previous behaviour.
1003 sb->sb_csum = md_csum_fold(disk_csum);
1005 sb->sb_csum = disk_csum;
1012 * Handle superblock details.
1013 * We want to be able to handle multiple superblock formats
1014 * so we have a common interface to them all, and an array of
1015 * different handlers.
1016 * We rely on user-space to write the initial superblock, and support
1017 * reading and updating of superblocks.
1018 * Interface methods are:
1019 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version)
1020 * loads and validates a superblock on dev.
1021 * if refdev != NULL, compare superblocks on both devices
1023 * 0 - dev has a superblock that is compatible with refdev
1024 * 1 - dev has a superblock that is compatible and newer than refdev
1025 * so dev should be used as the refdev in future
1026 * -EINVAL superblock incompatible or invalid
1027 * -othererror e.g. -EIO
1029 * int validate_super(struct mddev *mddev, struct md_rdev *dev)
1030 * Verify that dev is acceptable into mddev.
1031 * The first time, mddev->raid_disks will be 0, and data from
1032 * dev should be merged in. Subsequent calls check that dev
1033 * is new enough. Return 0 or -EINVAL
1035 * void sync_super(struct mddev *mddev, struct md_rdev *dev)
1036 * Update the superblock for rdev with data in mddev
1037 * This does not write to disc.
1043 struct module *owner;
1044 int (*load_super)(struct md_rdev *rdev,
1045 struct md_rdev *refdev,
1047 int (*validate_super)(struct mddev *mddev,
1048 struct md_rdev *rdev);
1049 void (*sync_super)(struct mddev *mddev,
1050 struct md_rdev *rdev);
1051 unsigned long long (*rdev_size_change)(struct md_rdev *rdev,
1052 sector_t num_sectors);
1053 int (*allow_new_offset)(struct md_rdev *rdev,
1054 unsigned long long new_offset);
1058 * Check that the given mddev has no bitmap.
1060 * This function is called from the run method of all personalities that do not
1061 * support bitmaps. It prints an error message and returns non-zero if mddev
1062 * has a bitmap. Otherwise, it returns 0.
1065 int md_check_no_bitmap(struct mddev *mddev)
1067 if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset)
1069 printk(KERN_ERR "%s: bitmaps are not supported for %s\n",
1070 mdname(mddev), mddev->pers->name);
1073 EXPORT_SYMBOL(md_check_no_bitmap);
1076 * load_super for 0.90.0
1078 static int super_90_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
1080 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1085 * Calculate the position of the superblock (512byte sectors),
1086 * it's at the end of the disk.
1088 * It also happens to be a multiple of 4Kb.
1090 rdev->sb_start = calc_dev_sboffset(rdev);
1092 ret = read_disk_sb(rdev, MD_SB_BYTES);
1093 if (ret) return ret;
1097 bdevname(rdev->bdev, b);
1098 sb = page_address(rdev->sb_page);
1100 if (sb->md_magic != MD_SB_MAGIC) {
1101 printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
1106 if (sb->major_version != 0 ||
1107 sb->minor_version < 90 ||
1108 sb->minor_version > 91) {
1109 printk(KERN_WARNING "Bad version number %d.%d on %s\n",
1110 sb->major_version, sb->minor_version,
1115 if (sb->raid_disks <= 0)
1118 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
1119 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
1124 rdev->preferred_minor = sb->md_minor;
1125 rdev->data_offset = 0;
1126 rdev->new_data_offset = 0;
1127 rdev->sb_size = MD_SB_BYTES;
1128 rdev->badblocks.shift = -1;
1130 if (sb->level == LEVEL_MULTIPATH)
1133 rdev->desc_nr = sb->this_disk.number;
1139 mdp_super_t *refsb = page_address(refdev->sb_page);
1140 if (!uuid_equal(refsb, sb)) {
1141 printk(KERN_WARNING "md: %s has different UUID to %s\n",
1142 b, bdevname(refdev->bdev,b2));
1145 if (!sb_equal(refsb, sb)) {
1146 printk(KERN_WARNING "md: %s has same UUID"
1147 " but different superblock to %s\n",
1148 b, bdevname(refdev->bdev, b2));
1152 ev2 = md_event(refsb);
1158 rdev->sectors = rdev->sb_start;
1159 /* Limit to 4TB as metadata cannot record more than that */
1160 if (rdev->sectors >= (2ULL << 32))
1161 rdev->sectors = (2ULL << 32) - 2;
1163 if (rdev->sectors < ((sector_t)sb->size) * 2 && sb->level >= 1)
1164 /* "this cannot possibly happen" ... */
1172 * validate_super for 0.90.0
1174 static int super_90_validate(struct mddev *mddev, struct md_rdev *rdev)
1177 mdp_super_t *sb = page_address(rdev->sb_page);
1178 __u64 ev1 = md_event(sb);
1180 rdev->raid_disk = -1;
1181 clear_bit(Faulty, &rdev->flags);
1182 clear_bit(In_sync, &rdev->flags);
1183 clear_bit(WriteMostly, &rdev->flags);
1185 if (mddev->raid_disks == 0) {
1186 mddev->major_version = 0;
1187 mddev->minor_version = sb->minor_version;
1188 mddev->patch_version = sb->patch_version;
1189 mddev->external = 0;
1190 mddev->chunk_sectors = sb->chunk_size >> 9;
1191 mddev->ctime = sb->ctime;
1192 mddev->utime = sb->utime;
1193 mddev->level = sb->level;
1194 mddev->clevel[0] = 0;
1195 mddev->layout = sb->layout;
1196 mddev->raid_disks = sb->raid_disks;
1197 mddev->dev_sectors = ((sector_t)sb->size) * 2;
1198 mddev->events = ev1;
1199 mddev->bitmap_info.offset = 0;
1200 mddev->bitmap_info.space = 0;
1201 /* bitmap can use 60 K after the 4K superblocks */
1202 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
1203 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
1204 mddev->reshape_backwards = 0;
1206 if (mddev->minor_version >= 91) {
1207 mddev->reshape_position = sb->reshape_position;
1208 mddev->delta_disks = sb->delta_disks;
1209 mddev->new_level = sb->new_level;
1210 mddev->new_layout = sb->new_layout;
1211 mddev->new_chunk_sectors = sb->new_chunk >> 9;
1212 if (mddev->delta_disks < 0)
1213 mddev->reshape_backwards = 1;
1215 mddev->reshape_position = MaxSector;
1216 mddev->delta_disks = 0;
1217 mddev->new_level = mddev->level;
1218 mddev->new_layout = mddev->layout;
1219 mddev->new_chunk_sectors = mddev->chunk_sectors;
1222 if (sb->state & (1<<MD_SB_CLEAN))
1223 mddev->recovery_cp = MaxSector;
1225 if (sb->events_hi == sb->cp_events_hi &&
1226 sb->events_lo == sb->cp_events_lo) {
1227 mddev->recovery_cp = sb->recovery_cp;
1229 mddev->recovery_cp = 0;
1232 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
1233 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
1234 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
1235 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
1237 mddev->max_disks = MD_SB_DISKS;
1239 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
1240 mddev->bitmap_info.file == NULL) {
1241 mddev->bitmap_info.offset =
1242 mddev->bitmap_info.default_offset;
1243 mddev->bitmap_info.space =
1244 mddev->bitmap_info.space;
1247 } else if (mddev->pers == NULL) {
1248 /* Insist on good event counter while assembling, except
1249 * for spares (which don't need an event count) */
1251 if (sb->disks[rdev->desc_nr].state & (
1252 (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE)))
1253 if (ev1 < mddev->events)
1255 } else if (mddev->bitmap) {
1256 /* if adding to array with a bitmap, then we can accept an
1257 * older device ... but not too old.
1259 if (ev1 < mddev->bitmap->events_cleared)
1262 if (ev1 < mddev->events)
1263 /* just a hot-add of a new device, leave raid_disk at -1 */
1267 if (mddev->level != LEVEL_MULTIPATH) {
1268 desc = sb->disks + rdev->desc_nr;
1270 if (desc->state & (1<<MD_DISK_FAULTY))
1271 set_bit(Faulty, &rdev->flags);
1272 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
1273 desc->raid_disk < mddev->raid_disks */) {
1274 set_bit(In_sync, &rdev->flags);
1275 rdev->raid_disk = desc->raid_disk;
1276 } else if (desc->state & (1<<MD_DISK_ACTIVE)) {
1277 /* active but not in sync implies recovery up to
1278 * reshape position. We don't know exactly where
1279 * that is, so set to zero for now */
1280 if (mddev->minor_version >= 91) {
1281 rdev->recovery_offset = 0;
1282 rdev->raid_disk = desc->raid_disk;
1285 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
1286 set_bit(WriteMostly, &rdev->flags);
1287 } else /* MULTIPATH are always insync */
1288 set_bit(In_sync, &rdev->flags);
1293 * sync_super for 0.90.0
1295 static void super_90_sync(struct mddev *mddev, struct md_rdev *rdev)
1298 struct md_rdev *rdev2;
1299 int next_spare = mddev->raid_disks;
1302 /* make rdev->sb match mddev data..
1305 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1306 * 3/ any empty disks < next_spare become removed
1308 * disks[0] gets initialised to REMOVED because
1309 * we cannot be sure from other fields if it has
1310 * been initialised or not.
1313 int active=0, working=0,failed=0,spare=0,nr_disks=0;
1315 rdev->sb_size = MD_SB_BYTES;
1317 sb = page_address(rdev->sb_page);
1319 memset(sb, 0, sizeof(*sb));
1321 sb->md_magic = MD_SB_MAGIC;
1322 sb->major_version = mddev->major_version;
1323 sb->patch_version = mddev->patch_version;
1324 sb->gvalid_words = 0; /* ignored */
1325 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
1326 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
1327 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
1328 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
1330 sb->ctime = mddev->ctime;
1331 sb->level = mddev->level;
1332 sb->size = mddev->dev_sectors / 2;
1333 sb->raid_disks = mddev->raid_disks;
1334 sb->md_minor = mddev->md_minor;
1335 sb->not_persistent = 0;
1336 sb->utime = mddev->utime;
1338 sb->events_hi = (mddev->events>>32);
1339 sb->events_lo = (u32)mddev->events;
1341 if (mddev->reshape_position == MaxSector)
1342 sb->minor_version = 90;
1344 sb->minor_version = 91;
1345 sb->reshape_position = mddev->reshape_position;
1346 sb->new_level = mddev->new_level;
1347 sb->delta_disks = mddev->delta_disks;
1348 sb->new_layout = mddev->new_layout;
1349 sb->new_chunk = mddev->new_chunk_sectors << 9;
1351 mddev->minor_version = sb->minor_version;
1354 sb->recovery_cp = mddev->recovery_cp;
1355 sb->cp_events_hi = (mddev->events>>32);
1356 sb->cp_events_lo = (u32)mddev->events;
1357 if (mddev->recovery_cp == MaxSector)
1358 sb->state = (1<< MD_SB_CLEAN);
1360 sb->recovery_cp = 0;
1362 sb->layout = mddev->layout;
1363 sb->chunk_size = mddev->chunk_sectors << 9;
1365 if (mddev->bitmap && mddev->bitmap_info.file == NULL)
1366 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
1368 sb->disks[0].state = (1<<MD_DISK_REMOVED);
1369 rdev_for_each(rdev2, mddev) {
1372 int is_active = test_bit(In_sync, &rdev2->flags);
1374 if (rdev2->raid_disk >= 0 &&
1375 sb->minor_version >= 91)
1376 /* we have nowhere to store the recovery_offset,
1377 * but if it is not below the reshape_position,
1378 * we can piggy-back on that.
1381 if (rdev2->raid_disk < 0 ||
1382 test_bit(Faulty, &rdev2->flags))
1385 desc_nr = rdev2->raid_disk;
1387 desc_nr = next_spare++;
1388 rdev2->desc_nr = desc_nr;
1389 d = &sb->disks[rdev2->desc_nr];
1391 d->number = rdev2->desc_nr;
1392 d->major = MAJOR(rdev2->bdev->bd_dev);
1393 d->minor = MINOR(rdev2->bdev->bd_dev);
1395 d->raid_disk = rdev2->raid_disk;
1397 d->raid_disk = rdev2->desc_nr; /* compatibility */
1398 if (test_bit(Faulty, &rdev2->flags))
1399 d->state = (1<<MD_DISK_FAULTY);
1400 else if (is_active) {
1401 d->state = (1<<MD_DISK_ACTIVE);
1402 if (test_bit(In_sync, &rdev2->flags))
1403 d->state |= (1<<MD_DISK_SYNC);
1411 if (test_bit(WriteMostly, &rdev2->flags))
1412 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1414 /* now set the "removed" and "faulty" bits on any missing devices */
1415 for (i=0 ; i < mddev->raid_disks ; i++) {
1416 mdp_disk_t *d = &sb->disks[i];
1417 if (d->state == 0 && d->number == 0) {
1420 d->state = (1<<MD_DISK_REMOVED);
1421 d->state |= (1<<MD_DISK_FAULTY);
1425 sb->nr_disks = nr_disks;
1426 sb->active_disks = active;
1427 sb->working_disks = working;
1428 sb->failed_disks = failed;
1429 sb->spare_disks = spare;
1431 sb->this_disk = sb->disks[rdev->desc_nr];
1432 sb->sb_csum = calc_sb_csum(sb);
1436 * rdev_size_change for 0.90.0
1438 static unsigned long long
1439 super_90_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
1441 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1442 return 0; /* component must fit device */
1443 if (rdev->mddev->bitmap_info.offset)
1444 return 0; /* can't move bitmap */
1445 rdev->sb_start = calc_dev_sboffset(rdev);
1446 if (!num_sectors || num_sectors > rdev->sb_start)
1447 num_sectors = rdev->sb_start;
1448 /* Limit to 4TB as metadata cannot record more than that.
1449 * 4TB == 2^32 KB, or 2*2^32 sectors.
1451 if (num_sectors >= (2ULL << 32))
1452 num_sectors = (2ULL << 32) - 2;
1453 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1455 md_super_wait(rdev->mddev);
1460 super_90_allow_new_offset(struct md_rdev *rdev, unsigned long long new_offset)
1462 /* non-zero offset changes not possible with v0.90 */
1463 return new_offset == 0;
1467 * version 1 superblock
1470 static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb)
1474 unsigned long long newcsum;
1475 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1476 __le32 *isuper = (__le32*)sb;
1479 disk_csum = sb->sb_csum;
1482 for (i=0; size>=4; size -= 4 )
1483 newcsum += le32_to_cpu(*isuper++);
1486 newcsum += le16_to_cpu(*(__le16*) isuper);
1488 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1489 sb->sb_csum = disk_csum;
1490 return cpu_to_le32(csum);
1493 static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors,
1495 static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
1497 struct mdp_superblock_1 *sb;
1501 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1505 * Calculate the position of the superblock in 512byte sectors.
1506 * It is always aligned to a 4K boundary and
1507 * depeding on minor_version, it can be:
1508 * 0: At least 8K, but less than 12K, from end of device
1509 * 1: At start of device
1510 * 2: 4K from start of device.
1512 switch(minor_version) {
1514 sb_start = i_size_read(rdev->bdev->bd_inode) >> 9;
1516 sb_start &= ~(sector_t)(4*2-1);
1527 rdev->sb_start = sb_start;
1529 /* superblock is rarely larger than 1K, but it can be larger,
1530 * and it is safe to read 4k, so we do that
1532 ret = read_disk_sb(rdev, 4096);
1533 if (ret) return ret;
1536 sb = page_address(rdev->sb_page);
1538 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1539 sb->major_version != cpu_to_le32(1) ||
1540 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1541 le64_to_cpu(sb->super_offset) != rdev->sb_start ||
1542 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1545 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1546 printk("md: invalid superblock checksum on %s\n",
1547 bdevname(rdev->bdev,b));
1550 if (le64_to_cpu(sb->data_size) < 10) {
1551 printk("md: data_size too small on %s\n",
1552 bdevname(rdev->bdev,b));
1557 memcmp(sb->pad3, sb->pad3+1, sizeof(sb->pad3) - sizeof(sb->pad3[1])))
1558 /* Some padding is non-zero, might be a new feature */
1561 rdev->preferred_minor = 0xffff;
1562 rdev->data_offset = le64_to_cpu(sb->data_offset);
1563 rdev->new_data_offset = rdev->data_offset;
1564 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE) &&
1565 (le32_to_cpu(sb->feature_map) & MD_FEATURE_NEW_OFFSET))
1566 rdev->new_data_offset += (s32)le32_to_cpu(sb->new_offset);
1567 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1569 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1570 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1571 if (rdev->sb_size & bmask)
1572 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1575 && rdev->data_offset < sb_start + (rdev->sb_size/512))
1578 && rdev->new_data_offset < sb_start + (rdev->sb_size/512))
1581 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1584 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1586 if (!rdev->bb_page) {
1587 rdev->bb_page = alloc_page(GFP_KERNEL);
1591 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BAD_BLOCKS) &&
1592 rdev->badblocks.count == 0) {
1593 /* need to load the bad block list.
1594 * Currently we limit it to one page.
1600 int sectors = le16_to_cpu(sb->bblog_size);
1601 if (sectors > (PAGE_SIZE / 512))
1603 offset = le32_to_cpu(sb->bblog_offset);
1606 bb_sector = (long long)offset;
1607 if (!sync_page_io(rdev, bb_sector, sectors << 9,
1608 rdev->bb_page, READ, true))
1610 bbp = (u64 *)page_address(rdev->bb_page);
1611 rdev->badblocks.shift = sb->bblog_shift;
1612 for (i = 0 ; i < (sectors << (9-3)) ; i++, bbp++) {
1613 u64 bb = le64_to_cpu(*bbp);
1614 int count = bb & (0x3ff);
1615 u64 sector = bb >> 10;
1616 sector <<= sb->bblog_shift;
1617 count <<= sb->bblog_shift;
1620 if (md_set_badblocks(&rdev->badblocks,
1621 sector, count, 1) == 0)
1624 } else if (sb->bblog_offset == 0)
1625 rdev->badblocks.shift = -1;
1631 struct mdp_superblock_1 *refsb = page_address(refdev->sb_page);
1633 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1634 sb->level != refsb->level ||
1635 sb->layout != refsb->layout ||
1636 sb->chunksize != refsb->chunksize) {
1637 printk(KERN_WARNING "md: %s has strangely different"
1638 " superblock to %s\n",
1639 bdevname(rdev->bdev,b),
1640 bdevname(refdev->bdev,b2));
1643 ev1 = le64_to_cpu(sb->events);
1644 ev2 = le64_to_cpu(refsb->events);
1651 if (minor_version) {
1652 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9);
1653 sectors -= rdev->data_offset;
1655 sectors = rdev->sb_start;
1656 if (sectors < le64_to_cpu(sb->data_size))
1658 rdev->sectors = le64_to_cpu(sb->data_size);
1662 static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev)
1664 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
1665 __u64 ev1 = le64_to_cpu(sb->events);
1667 rdev->raid_disk = -1;
1668 clear_bit(Faulty, &rdev->flags);
1669 clear_bit(In_sync, &rdev->flags);
1670 clear_bit(WriteMostly, &rdev->flags);
1672 if (mddev->raid_disks == 0) {
1673 mddev->major_version = 1;
1674 mddev->patch_version = 0;
1675 mddev->external = 0;
1676 mddev->chunk_sectors = le32_to_cpu(sb->chunksize);
1677 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1678 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1679 mddev->level = le32_to_cpu(sb->level);
1680 mddev->clevel[0] = 0;
1681 mddev->layout = le32_to_cpu(sb->layout);
1682 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1683 mddev->dev_sectors = le64_to_cpu(sb->size);
1684 mddev->events = ev1;
1685 mddev->bitmap_info.offset = 0;
1686 mddev->bitmap_info.space = 0;
1687 /* Default location for bitmap is 1K after superblock
1688 * using 3K - total of 4K
1690 mddev->bitmap_info.default_offset = 1024 >> 9;
1691 mddev->bitmap_info.default_space = (4096-1024) >> 9;
1692 mddev->reshape_backwards = 0;
1694 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1695 memcpy(mddev->uuid, sb->set_uuid, 16);
1697 mddev->max_disks = (4096-256)/2;
1699 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1700 mddev->bitmap_info.file == NULL) {
1701 mddev->bitmap_info.offset =
1702 (__s32)le32_to_cpu(sb->bitmap_offset);
1703 /* Metadata doesn't record how much space is available.
1704 * For 1.0, we assume we can use up to the superblock
1705 * if before, else to 4K beyond superblock.
1706 * For others, assume no change is possible.
1708 if (mddev->minor_version > 0)
1709 mddev->bitmap_info.space = 0;
1710 else if (mddev->bitmap_info.offset > 0)
1711 mddev->bitmap_info.space =
1712 8 - mddev->bitmap_info.offset;
1714 mddev->bitmap_info.space =
1715 -mddev->bitmap_info.offset;
1718 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1719 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1720 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1721 mddev->new_level = le32_to_cpu(sb->new_level);
1722 mddev->new_layout = le32_to_cpu(sb->new_layout);
1723 mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk);
1724 if (mddev->delta_disks < 0 ||
1725 (mddev->delta_disks == 0 &&
1726 (le32_to_cpu(sb->feature_map)
1727 & MD_FEATURE_RESHAPE_BACKWARDS)))
1728 mddev->reshape_backwards = 1;
1730 mddev->reshape_position = MaxSector;
1731 mddev->delta_disks = 0;
1732 mddev->new_level = mddev->level;
1733 mddev->new_layout = mddev->layout;
1734 mddev->new_chunk_sectors = mddev->chunk_sectors;
1737 } else if (mddev->pers == NULL) {
1738 /* Insist of good event counter while assembling, except for
1739 * spares (which don't need an event count) */
1741 if (rdev->desc_nr >= 0 &&
1742 rdev->desc_nr < le32_to_cpu(sb->max_dev) &&
1743 le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < 0xfffe)
1744 if (ev1 < mddev->events)
1746 } else if (mddev->bitmap) {
1747 /* If adding to array with a bitmap, then we can accept an
1748 * older device, but not too old.
1750 if (ev1 < mddev->bitmap->events_cleared)
1753 if (ev1 < mddev->events)
1754 /* just a hot-add of a new device, leave raid_disk at -1 */
1757 if (mddev->level != LEVEL_MULTIPATH) {
1759 if (rdev->desc_nr < 0 ||
1760 rdev->desc_nr >= le32_to_cpu(sb->max_dev)) {
1764 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1766 case 0xffff: /* spare */
1768 case 0xfffe: /* faulty */
1769 set_bit(Faulty, &rdev->flags);
1772 if ((le32_to_cpu(sb->feature_map) &
1773 MD_FEATURE_RECOVERY_OFFSET))
1774 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1776 set_bit(In_sync, &rdev->flags);
1777 rdev->raid_disk = role;
1780 if (sb->devflags & WriteMostly1)
1781 set_bit(WriteMostly, &rdev->flags);
1782 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_REPLACEMENT)
1783 set_bit(Replacement, &rdev->flags);
1784 } else /* MULTIPATH are always insync */
1785 set_bit(In_sync, &rdev->flags);
1790 static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev)
1792 struct mdp_superblock_1 *sb;
1793 struct md_rdev *rdev2;
1795 /* make rdev->sb match mddev and rdev data. */
1797 sb = page_address(rdev->sb_page);
1799 sb->feature_map = 0;
1801 sb->recovery_offset = cpu_to_le64(0);
1802 memset(sb->pad3, 0, sizeof(sb->pad3));
1804 sb->utime = cpu_to_le64((__u64)mddev->utime);
1805 sb->events = cpu_to_le64(mddev->events);
1807 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1809 sb->resync_offset = cpu_to_le64(0);
1811 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
1813 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
1814 sb->size = cpu_to_le64(mddev->dev_sectors);
1815 sb->chunksize = cpu_to_le32(mddev->chunk_sectors);
1816 sb->level = cpu_to_le32(mddev->level);
1817 sb->layout = cpu_to_le32(mddev->layout);
1819 if (test_bit(WriteMostly, &rdev->flags))
1820 sb->devflags |= WriteMostly1;
1822 sb->devflags &= ~WriteMostly1;
1823 sb->data_offset = cpu_to_le64(rdev->data_offset);
1824 sb->data_size = cpu_to_le64(rdev->sectors);
1826 if (mddev->bitmap && mddev->bitmap_info.file == NULL) {
1827 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset);
1828 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
1831 if (rdev->raid_disk >= 0 &&
1832 !test_bit(In_sync, &rdev->flags)) {
1834 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1835 sb->recovery_offset =
1836 cpu_to_le64(rdev->recovery_offset);
1838 if (test_bit(Replacement, &rdev->flags))
1840 cpu_to_le32(MD_FEATURE_REPLACEMENT);
1842 if (mddev->reshape_position != MaxSector) {
1843 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1844 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1845 sb->new_layout = cpu_to_le32(mddev->new_layout);
1846 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1847 sb->new_level = cpu_to_le32(mddev->new_level);
1848 sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors);
1849 if (mddev->delta_disks == 0 &&
1850 mddev->reshape_backwards)
1852 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS);
1853 if (rdev->new_data_offset != rdev->data_offset) {
1855 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET);
1856 sb->new_offset = cpu_to_le32((__u32)(rdev->new_data_offset
1857 - rdev->data_offset));
1861 if (rdev->badblocks.count == 0)
1862 /* Nothing to do for bad blocks*/ ;
1863 else if (sb->bblog_offset == 0)
1864 /* Cannot record bad blocks on this device */
1865 md_error(mddev, rdev);
1867 struct badblocks *bb = &rdev->badblocks;
1868 u64 *bbp = (u64 *)page_address(rdev->bb_page);
1870 sb->feature_map |= cpu_to_le32(MD_FEATURE_BAD_BLOCKS);
1875 seq = read_seqbegin(&bb->lock);
1877 memset(bbp, 0xff, PAGE_SIZE);
1879 for (i = 0 ; i < bb->count ; i++) {
1880 u64 internal_bb = *p++;
1881 u64 store_bb = ((BB_OFFSET(internal_bb) << 10)
1882 | BB_LEN(internal_bb));
1883 *bbp++ = cpu_to_le64(store_bb);
1886 if (read_seqretry(&bb->lock, seq))
1889 bb->sector = (rdev->sb_start +
1890 (int)le32_to_cpu(sb->bblog_offset));
1891 bb->size = le16_to_cpu(sb->bblog_size);
1896 rdev_for_each(rdev2, mddev)
1897 if (rdev2->desc_nr+1 > max_dev)
1898 max_dev = rdev2->desc_nr+1;
1900 if (max_dev > le32_to_cpu(sb->max_dev)) {
1902 sb->max_dev = cpu_to_le32(max_dev);
1903 rdev->sb_size = max_dev * 2 + 256;
1904 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1905 if (rdev->sb_size & bmask)
1906 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1908 max_dev = le32_to_cpu(sb->max_dev);
1910 for (i=0; i<max_dev;i++)
1911 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1913 rdev_for_each(rdev2, mddev) {
1915 if (test_bit(Faulty, &rdev2->flags))
1916 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1917 else if (test_bit(In_sync, &rdev2->flags))
1918 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1919 else if (rdev2->raid_disk >= 0)
1920 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1922 sb->dev_roles[i] = cpu_to_le16(0xffff);
1925 sb->sb_csum = calc_sb_1_csum(sb);
1928 static unsigned long long
1929 super_1_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
1931 struct mdp_superblock_1 *sb;
1932 sector_t max_sectors;
1933 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1934 return 0; /* component must fit device */
1935 if (rdev->data_offset != rdev->new_data_offset)
1936 return 0; /* too confusing */
1937 if (rdev->sb_start < rdev->data_offset) {
1938 /* minor versions 1 and 2; superblock before data */
1939 max_sectors = i_size_read(rdev->bdev->bd_inode) >> 9;
1940 max_sectors -= rdev->data_offset;
1941 if (!num_sectors || num_sectors > max_sectors)
1942 num_sectors = max_sectors;
1943 } else if (rdev->mddev->bitmap_info.offset) {
1944 /* minor version 0 with bitmap we can't move */
1947 /* minor version 0; superblock after data */
1949 sb_start = (i_size_read(rdev->bdev->bd_inode) >> 9) - 8*2;
1950 sb_start &= ~(sector_t)(4*2 - 1);
1951 max_sectors = rdev->sectors + sb_start - rdev->sb_start;
1952 if (!num_sectors || num_sectors > max_sectors)
1953 num_sectors = max_sectors;
1954 rdev->sb_start = sb_start;
1956 sb = page_address(rdev->sb_page);
1957 sb->data_size = cpu_to_le64(num_sectors);
1958 sb->super_offset = rdev->sb_start;
1959 sb->sb_csum = calc_sb_1_csum(sb);
1960 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1962 md_super_wait(rdev->mddev);
1968 super_1_allow_new_offset(struct md_rdev *rdev,
1969 unsigned long long new_offset)
1971 /* All necessary checks on new >= old have been done */
1972 struct bitmap *bitmap;
1973 if (new_offset >= rdev->data_offset)
1976 /* with 1.0 metadata, there is no metadata to tread on
1977 * so we can always move back */
1978 if (rdev->mddev->minor_version == 0)
1981 /* otherwise we must be sure not to step on
1982 * any metadata, so stay:
1983 * 36K beyond start of superblock
1984 * beyond end of badblocks
1985 * beyond write-intent bitmap
1987 if (rdev->sb_start + (32+4)*2 > new_offset)
1989 bitmap = rdev->mddev->bitmap;
1990 if (bitmap && !rdev->mddev->bitmap_info.file &&
1991 rdev->sb_start + rdev->mddev->bitmap_info.offset +
1992 bitmap->file_pages * (PAGE_SIZE>>9) > new_offset)
1994 if (rdev->badblocks.sector + rdev->badblocks.size > new_offset)
2000 static struct super_type super_types[] = {
2003 .owner = THIS_MODULE,
2004 .load_super = super_90_load,
2005 .validate_super = super_90_validate,
2006 .sync_super = super_90_sync,
2007 .rdev_size_change = super_90_rdev_size_change,
2008 .allow_new_offset = super_90_allow_new_offset,
2012 .owner = THIS_MODULE,
2013 .load_super = super_1_load,
2014 .validate_super = super_1_validate,
2015 .sync_super = super_1_sync,
2016 .rdev_size_change = super_1_rdev_size_change,
2017 .allow_new_offset = super_1_allow_new_offset,
2021 static void sync_super(struct mddev *mddev, struct md_rdev *rdev)
2023 if (mddev->sync_super) {
2024 mddev->sync_super(mddev, rdev);
2028 BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types));
2030 super_types[mddev->major_version].sync_super(mddev, rdev);
2033 static int match_mddev_units(struct mddev *mddev1, struct mddev *mddev2)
2035 struct md_rdev *rdev, *rdev2;
2038 rdev_for_each_rcu(rdev, mddev1)
2039 rdev_for_each_rcu(rdev2, mddev2)
2040 if (rdev->bdev->bd_contains ==
2041 rdev2->bdev->bd_contains) {
2049 static LIST_HEAD(pending_raid_disks);
2052 * Try to register data integrity profile for an mddev
2054 * This is called when an array is started and after a disk has been kicked
2055 * from the array. It only succeeds if all working and active component devices
2056 * are integrity capable with matching profiles.
2058 int md_integrity_register(struct mddev *mddev)
2060 struct md_rdev *rdev, *reference = NULL;
2062 if (list_empty(&mddev->disks))
2063 return 0; /* nothing to do */
2064 if (!mddev->gendisk || blk_get_integrity(mddev->gendisk))
2065 return 0; /* shouldn't register, or already is */
2066 rdev_for_each(rdev, mddev) {
2067 /* skip spares and non-functional disks */
2068 if (test_bit(Faulty, &rdev->flags))
2070 if (rdev->raid_disk < 0)
2073 /* Use the first rdev as the reference */
2077 /* does this rdev's profile match the reference profile? */
2078 if (blk_integrity_compare(reference->bdev->bd_disk,
2079 rdev->bdev->bd_disk) < 0)
2082 if (!reference || !bdev_get_integrity(reference->bdev))
2085 * All component devices are integrity capable and have matching
2086 * profiles, register the common profile for the md device.
2088 if (blk_integrity_register(mddev->gendisk,
2089 bdev_get_integrity(reference->bdev)) != 0) {
2090 printk(KERN_ERR "md: failed to register integrity for %s\n",
2094 printk(KERN_NOTICE "md: data integrity enabled on %s\n", mdname(mddev));
2095 if (bioset_integrity_create(mddev->bio_set, BIO_POOL_SIZE)) {
2096 printk(KERN_ERR "md: failed to create integrity pool for %s\n",
2102 EXPORT_SYMBOL(md_integrity_register);
2104 /* Disable data integrity if non-capable/non-matching disk is being added */
2105 void md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev)
2107 struct blk_integrity *bi_rdev = bdev_get_integrity(rdev->bdev);
2108 struct blk_integrity *bi_mddev = blk_get_integrity(mddev->gendisk);
2110 if (!bi_mddev) /* nothing to do */
2112 if (rdev->raid_disk < 0) /* skip spares */
2114 if (bi_rdev && blk_integrity_compare(mddev->gendisk,
2115 rdev->bdev->bd_disk) >= 0)
2117 printk(KERN_NOTICE "disabling data integrity on %s\n", mdname(mddev));
2118 blk_integrity_unregister(mddev->gendisk);
2120 EXPORT_SYMBOL(md_integrity_add_rdev);
2122 static int bind_rdev_to_array(struct md_rdev * rdev, struct mddev * mddev)
2124 char b[BDEVNAME_SIZE];
2134 /* prevent duplicates */
2135 if (find_rdev(mddev, rdev->bdev->bd_dev))
2138 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2139 if (rdev->sectors && (mddev->dev_sectors == 0 ||
2140 rdev->sectors < mddev->dev_sectors)) {
2142 /* Cannot change size, so fail
2143 * If mddev->level <= 0, then we don't care
2144 * about aligning sizes (e.g. linear)
2146 if (mddev->level > 0)
2149 mddev->dev_sectors = rdev->sectors;
2152 /* Verify rdev->desc_nr is unique.
2153 * If it is -1, assign a free number, else
2154 * check number is not in use
2156 if (rdev->desc_nr < 0) {
2158 if (mddev->pers) choice = mddev->raid_disks;
2159 while (find_rdev_nr(mddev, choice))
2161 rdev->desc_nr = choice;
2163 if (find_rdev_nr(mddev, rdev->desc_nr))
2166 if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) {
2167 printk(KERN_WARNING "md: %s: array is limited to %d devices\n",
2168 mdname(mddev), mddev->max_disks);
2171 bdevname(rdev->bdev,b);
2172 while ( (s=strchr(b, '/')) != NULL)
2175 rdev->mddev = mddev;
2176 printk(KERN_INFO "md: bind<%s>\n", b);
2178 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
2181 ko = &part_to_dev(rdev->bdev->bd_part)->kobj;
2182 if (sysfs_create_link(&rdev->kobj, ko, "block"))
2183 /* failure here is OK */;
2184 rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state");
2186 list_add_rcu(&rdev->same_set, &mddev->disks);
2187 bd_link_disk_holder(rdev->bdev, mddev->gendisk);
2189 /* May as well allow recovery to be retried once */
2190 mddev->recovery_disabled++;
2195 printk(KERN_WARNING "md: failed to register dev-%s for %s\n",
2200 static void md_delayed_delete(struct work_struct *ws)
2202 struct md_rdev *rdev = container_of(ws, struct md_rdev, del_work);
2203 kobject_del(&rdev->kobj);
2204 kobject_put(&rdev->kobj);
2207 static void unbind_rdev_from_array(struct md_rdev * rdev)
2209 char b[BDEVNAME_SIZE];
2214 bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk);
2215 list_del_rcu(&rdev->same_set);
2216 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
2218 sysfs_remove_link(&rdev->kobj, "block");
2219 sysfs_put(rdev->sysfs_state);
2220 rdev->sysfs_state = NULL;
2221 rdev->badblocks.count = 0;
2222 /* We need to delay this, otherwise we can deadlock when
2223 * writing to 'remove' to "dev/state". We also need
2224 * to delay it due to rcu usage.
2227 INIT_WORK(&rdev->del_work, md_delayed_delete);
2228 kobject_get(&rdev->kobj);
2229 queue_work(md_misc_wq, &rdev->del_work);
2233 * prevent the device from being mounted, repartitioned or
2234 * otherwise reused by a RAID array (or any other kernel
2235 * subsystem), by bd_claiming the device.
2237 static int lock_rdev(struct md_rdev *rdev, dev_t dev, int shared)
2240 struct block_device *bdev;
2241 char b[BDEVNAME_SIZE];
2243 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
2244 shared ? (struct md_rdev *)lock_rdev : rdev);
2246 printk(KERN_ERR "md: could not open %s.\n",
2247 __bdevname(dev, b));
2248 return PTR_ERR(bdev);
2254 static void unlock_rdev(struct md_rdev *rdev)
2256 struct block_device *bdev = rdev->bdev;
2260 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
2263 void md_autodetect_dev(dev_t dev);
2265 static void export_rdev(struct md_rdev * rdev)
2267 char b[BDEVNAME_SIZE];
2268 printk(KERN_INFO "md: export_rdev(%s)\n",
2269 bdevname(rdev->bdev,b));
2272 md_rdev_clear(rdev);
2274 if (test_bit(AutoDetected, &rdev->flags))
2275 md_autodetect_dev(rdev->bdev->bd_dev);
2278 kobject_put(&rdev->kobj);
2281 static void kick_rdev_from_array(struct md_rdev * rdev)
2283 unbind_rdev_from_array(rdev);
2287 static void export_array(struct mddev *mddev)
2289 struct md_rdev *rdev, *tmp;
2291 rdev_for_each_safe(rdev, tmp, mddev) {
2296 kick_rdev_from_array(rdev);
2298 if (!list_empty(&mddev->disks))
2300 mddev->raid_disks = 0;
2301 mddev->major_version = 0;
2304 static void print_desc(mdp_disk_t *desc)
2306 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
2307 desc->major,desc->minor,desc->raid_disk,desc->state);
2310 static void print_sb_90(mdp_super_t *sb)
2315 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
2316 sb->major_version, sb->minor_version, sb->patch_version,
2317 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
2319 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
2320 sb->level, sb->size, sb->nr_disks, sb->raid_disks,
2321 sb->md_minor, sb->layout, sb->chunk_size);
2322 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
2323 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
2324 sb->utime, sb->state, sb->active_disks, sb->working_disks,
2325 sb->failed_disks, sb->spare_disks,
2326 sb->sb_csum, (unsigned long)sb->events_lo);
2329 for (i = 0; i < MD_SB_DISKS; i++) {
2332 desc = sb->disks + i;
2333 if (desc->number || desc->major || desc->minor ||
2334 desc->raid_disk || (desc->state && (desc->state != 4))) {
2335 printk(" D %2d: ", i);
2339 printk(KERN_INFO "md: THIS: ");
2340 print_desc(&sb->this_disk);
2343 static void print_sb_1(struct mdp_superblock_1 *sb)
2347 uuid = sb->set_uuid;
2349 "md: SB: (V:%u) (F:0x%08x) Array-ID:<%pU>\n"
2350 "md: Name: \"%s\" CT:%llu\n",
2351 le32_to_cpu(sb->major_version),
2352 le32_to_cpu(sb->feature_map),
2355 (unsigned long long)le64_to_cpu(sb->ctime)
2356 & MD_SUPERBLOCK_1_TIME_SEC_MASK);
2358 uuid = sb->device_uuid;
2360 "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu"
2362 "md: Dev:%08x UUID: %pU\n"
2363 "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n"
2364 "md: (MaxDev:%u) \n",
2365 le32_to_cpu(sb->level),
2366 (unsigned long long)le64_to_cpu(sb->size),
2367 le32_to_cpu(sb->raid_disks),
2368 le32_to_cpu(sb->layout),
2369 le32_to_cpu(sb->chunksize),
2370 (unsigned long long)le64_to_cpu(sb->data_offset),
2371 (unsigned long long)le64_to_cpu(sb->data_size),
2372 (unsigned long long)le64_to_cpu(sb->super_offset),
2373 (unsigned long long)le64_to_cpu(sb->recovery_offset),
2374 le32_to_cpu(sb->dev_number),
2377 (unsigned long long)le64_to_cpu(sb->utime) & MD_SUPERBLOCK_1_TIME_SEC_MASK,
2378 (unsigned long long)le64_to_cpu(sb->events),
2379 (unsigned long long)le64_to_cpu(sb->resync_offset),
2380 le32_to_cpu(sb->sb_csum),
2381 le32_to_cpu(sb->max_dev)
2385 static void print_rdev(struct md_rdev *rdev, int major_version)
2387 char b[BDEVNAME_SIZE];
2388 printk(KERN_INFO "md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n",
2389 bdevname(rdev->bdev, b), (unsigned long long)rdev->sectors,
2390 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
2392 if (rdev->sb_loaded) {
2393 printk(KERN_INFO "md: rdev superblock (MJ:%d):\n", major_version);
2394 switch (major_version) {
2396 print_sb_90(page_address(rdev->sb_page));
2399 print_sb_1(page_address(rdev->sb_page));
2403 printk(KERN_INFO "md: no rdev superblock!\n");
2406 static void md_print_devices(void)
2408 struct list_head *tmp;
2409 struct md_rdev *rdev;
2410 struct mddev *mddev;
2411 char b[BDEVNAME_SIZE];
2414 printk("md: **********************************\n");
2415 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
2416 printk("md: **********************************\n");
2417 for_each_mddev(mddev, tmp) {
2420 bitmap_print_sb(mddev->bitmap);
2422 printk("%s: ", mdname(mddev));
2423 rdev_for_each(rdev, mddev)
2424 printk("<%s>", bdevname(rdev->bdev,b));
2427 rdev_for_each(rdev, mddev)
2428 print_rdev(rdev, mddev->major_version);
2430 printk("md: **********************************\n");
2435 static void sync_sbs(struct mddev * mddev, int nospares)
2437 /* Update each superblock (in-memory image), but
2438 * if we are allowed to, skip spares which already
2439 * have the right event counter, or have one earlier
2440 * (which would mean they aren't being marked as dirty
2441 * with the rest of the array)
2443 struct md_rdev *rdev;
2444 rdev_for_each(rdev, mddev) {
2445 if (rdev->sb_events == mddev->events ||
2447 rdev->raid_disk < 0 &&
2448 rdev->sb_events+1 == mddev->events)) {
2449 /* Don't update this superblock */
2450 rdev->sb_loaded = 2;
2452 sync_super(mddev, rdev);
2453 rdev->sb_loaded = 1;
2458 static void md_update_sb(struct mddev * mddev, int force_change)
2460 struct md_rdev *rdev;
2463 int any_badblocks_changed = 0;
2466 /* First make sure individual recovery_offsets are correct */
2467 rdev_for_each(rdev, mddev) {
2468 if (rdev->raid_disk >= 0 &&
2469 mddev->delta_disks >= 0 &&
2470 !test_bit(In_sync, &rdev->flags) &&
2471 mddev->curr_resync_completed > rdev->recovery_offset)
2472 rdev->recovery_offset = mddev->curr_resync_completed;
2475 if (!mddev->persistent) {
2476 clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
2477 clear_bit(MD_CHANGE_DEVS, &mddev->flags);
2478 if (!mddev->external) {
2479 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2480 rdev_for_each(rdev, mddev) {
2481 if (rdev->badblocks.changed) {
2482 rdev->badblocks.changed = 0;
2483 md_ack_all_badblocks(&rdev->badblocks);
2484 md_error(mddev, rdev);
2486 clear_bit(Blocked, &rdev->flags);
2487 clear_bit(BlockedBadBlocks, &rdev->flags);
2488 wake_up(&rdev->blocked_wait);
2491 wake_up(&mddev->sb_wait);
2495 spin_lock_irq(&mddev->write_lock);
2497 mddev->utime = get_seconds();
2499 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
2501 if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags))
2502 /* just a clean<-> dirty transition, possibly leave spares alone,
2503 * though if events isn't the right even/odd, we will have to do
2509 if (mddev->degraded)
2510 /* If the array is degraded, then skipping spares is both
2511 * dangerous and fairly pointless.
2512 * Dangerous because a device that was removed from the array
2513 * might have a event_count that still looks up-to-date,
2514 * so it can be re-added without a resync.
2515 * Pointless because if there are any spares to skip,
2516 * then a recovery will happen and soon that array won't
2517 * be degraded any more and the spare can go back to sleep then.
2521 sync_req = mddev->in_sync;
2523 /* If this is just a dirty<->clean transition, and the array is clean
2524 * and 'events' is odd, we can roll back to the previous clean state */
2526 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
2527 && mddev->can_decrease_events
2528 && mddev->events != 1) {
2530 mddev->can_decrease_events = 0;
2532 /* otherwise we have to go forward and ... */
2534 mddev->can_decrease_events = nospares;
2537 if (!mddev->events) {
2539 * oops, this 64-bit counter should never wrap.
2540 * Either we are in around ~1 trillion A.C., assuming
2541 * 1 reboot per second, or we have a bug:
2547 rdev_for_each(rdev, mddev) {
2548 if (rdev->badblocks.changed)
2549 any_badblocks_changed++;
2550 if (test_bit(Faulty, &rdev->flags))
2551 set_bit(FaultRecorded, &rdev->flags);
2554 sync_sbs(mddev, nospares);
2555 spin_unlock_irq(&mddev->write_lock);
2557 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2558 mdname(mddev), mddev->in_sync);
2560 bitmap_update_sb(mddev->bitmap);
2561 rdev_for_each(rdev, mddev) {
2562 char b[BDEVNAME_SIZE];
2564 if (rdev->sb_loaded != 1)
2565 continue; /* no noise on spare devices */
2567 if (!test_bit(Faulty, &rdev->flags) &&
2568 rdev->saved_raid_disk == -1) {
2569 md_super_write(mddev,rdev,
2570 rdev->sb_start, rdev->sb_size,
2572 pr_debug("md: (write) %s's sb offset: %llu\n",
2573 bdevname(rdev->bdev, b),
2574 (unsigned long long)rdev->sb_start);
2575 rdev->sb_events = mddev->events;
2576 if (rdev->badblocks.size) {
2577 md_super_write(mddev, rdev,
2578 rdev->badblocks.sector,
2579 rdev->badblocks.size << 9,
2581 rdev->badblocks.size = 0;
2584 } else if (test_bit(Faulty, &rdev->flags))
2585 pr_debug("md: %s (skipping faulty)\n",
2586 bdevname(rdev->bdev, b));
2588 pr_debug("(skipping incremental s/r ");
2590 if (mddev->level == LEVEL_MULTIPATH)
2591 /* only need to write one superblock... */
2594 md_super_wait(mddev);
2595 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2597 spin_lock_irq(&mddev->write_lock);
2598 if (mddev->in_sync != sync_req ||
2599 test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
2600 /* have to write it out again */
2601 spin_unlock_irq(&mddev->write_lock);
2604 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2605 spin_unlock_irq(&mddev->write_lock);
2606 wake_up(&mddev->sb_wait);
2607 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
2608 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
2610 rdev_for_each(rdev, mddev) {
2611 if (test_and_clear_bit(FaultRecorded, &rdev->flags))
2612 clear_bit(Blocked, &rdev->flags);
2614 if (any_badblocks_changed)
2615 md_ack_all_badblocks(&rdev->badblocks);
2616 clear_bit(BlockedBadBlocks, &rdev->flags);
2617 wake_up(&rdev->blocked_wait);
2621 /* words written to sysfs files may, or may not, be \n terminated.
2622 * We want to accept with case. For this we use cmd_match.
2624 static int cmd_match(const char *cmd, const char *str)
2626 /* See if cmd, written into a sysfs file, matches
2627 * str. They must either be the same, or cmd can
2628 * have a trailing newline
2630 while (*cmd && *str && *cmd == *str) {
2641 struct rdev_sysfs_entry {
2642 struct attribute attr;
2643 ssize_t (*show)(struct md_rdev *, char *);
2644 ssize_t (*store)(struct md_rdev *, const char *, size_t);
2648 state_show(struct md_rdev *rdev, char *page)
2653 if (test_bit(Faulty, &rdev->flags) ||
2654 rdev->badblocks.unacked_exist) {
2655 len+= sprintf(page+len, "%sfaulty",sep);
2658 if (test_bit(In_sync, &rdev->flags)) {
2659 len += sprintf(page+len, "%sin_sync",sep);
2662 if (test_bit(WriteMostly, &rdev->flags)) {
2663 len += sprintf(page+len, "%swrite_mostly",sep);
2666 if (test_bit(Blocked, &rdev->flags) ||
2667 (rdev->badblocks.unacked_exist
2668 && !test_bit(Faulty, &rdev->flags))) {
2669 len += sprintf(page+len, "%sblocked", sep);
2672 if (!test_bit(Faulty, &rdev->flags) &&
2673 !test_bit(In_sync, &rdev->flags)) {
2674 len += sprintf(page+len, "%sspare", sep);
2677 if (test_bit(WriteErrorSeen, &rdev->flags)) {
2678 len += sprintf(page+len, "%swrite_error", sep);
2681 if (test_bit(WantReplacement, &rdev->flags)) {
2682 len += sprintf(page+len, "%swant_replacement", sep);
2685 if (test_bit(Replacement, &rdev->flags)) {
2686 len += sprintf(page+len, "%sreplacement", sep);
2690 return len+sprintf(page+len, "\n");
2694 state_store(struct md_rdev *rdev, const char *buf, size_t len)
2697 * faulty - simulates an error
2698 * remove - disconnects the device
2699 * writemostly - sets write_mostly
2700 * -writemostly - clears write_mostly
2701 * blocked - sets the Blocked flags
2702 * -blocked - clears the Blocked and possibly simulates an error
2703 * insync - sets Insync providing device isn't active
2704 * write_error - sets WriteErrorSeen
2705 * -write_error - clears WriteErrorSeen
2708 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
2709 md_error(rdev->mddev, rdev);
2710 if (test_bit(Faulty, &rdev->flags))
2714 } else if (cmd_match(buf, "remove")) {
2715 if (rdev->raid_disk >= 0)
2718 struct mddev *mddev = rdev->mddev;
2719 kick_rdev_from_array(rdev);
2721 md_update_sb(mddev, 1);
2722 md_new_event(mddev);
2725 } else if (cmd_match(buf, "writemostly")) {
2726 set_bit(WriteMostly, &rdev->flags);
2728 } else if (cmd_match(buf, "-writemostly")) {
2729 clear_bit(WriteMostly, &rdev->flags);
2731 } else if (cmd_match(buf, "blocked")) {
2732 set_bit(Blocked, &rdev->flags);
2734 } else if (cmd_match(buf, "-blocked")) {
2735 if (!test_bit(Faulty, &rdev->flags) &&
2736 rdev->badblocks.unacked_exist) {
2737 /* metadata handler doesn't understand badblocks,
2738 * so we need to fail the device
2740 md_error(rdev->mddev, rdev);
2742 clear_bit(Blocked, &rdev->flags);
2743 clear_bit(BlockedBadBlocks, &rdev->flags);
2744 wake_up(&rdev->blocked_wait);
2745 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2746 md_wakeup_thread(rdev->mddev->thread);
2749 } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) {
2750 set_bit(In_sync, &rdev->flags);
2752 } else if (cmd_match(buf, "write_error")) {
2753 set_bit(WriteErrorSeen, &rdev->flags);
2755 } else if (cmd_match(buf, "-write_error")) {
2756 clear_bit(WriteErrorSeen, &rdev->flags);
2758 } else if (cmd_match(buf, "want_replacement")) {
2759 /* Any non-spare device that is not a replacement can
2760 * become want_replacement at any time, but we then need to
2761 * check if recovery is needed.
2763 if (rdev->raid_disk >= 0 &&
2764 !test_bit(Replacement, &rdev->flags))
2765 set_bit(WantReplacement, &rdev->flags);
2766 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2767 md_wakeup_thread(rdev->mddev->thread);
2769 } else if (cmd_match(buf, "-want_replacement")) {
2770 /* Clearing 'want_replacement' is always allowed.
2771 * Once replacements starts it is too late though.
2774 clear_bit(WantReplacement, &rdev->flags);
2775 } else if (cmd_match(buf, "replacement")) {
2776 /* Can only set a device as a replacement when array has not
2777 * yet been started. Once running, replacement is automatic
2778 * from spares, or by assigning 'slot'.
2780 if (rdev->mddev->pers)
2783 set_bit(Replacement, &rdev->flags);
2786 } else if (cmd_match(buf, "-replacement")) {
2787 /* Similarly, can only clear Replacement before start */
2788 if (rdev->mddev->pers)
2791 clear_bit(Replacement, &rdev->flags);
2796 sysfs_notify_dirent_safe(rdev->sysfs_state);
2797 return err ? err : len;
2799 static struct rdev_sysfs_entry rdev_state =
2800 __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store);
2803 errors_show(struct md_rdev *rdev, char *page)
2805 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
2809 errors_store(struct md_rdev *rdev, const char *buf, size_t len)
2812 unsigned long n = simple_strtoul(buf, &e, 10);
2813 if (*buf && (*e == 0 || *e == '\n')) {
2814 atomic_set(&rdev->corrected_errors, n);
2819 static struct rdev_sysfs_entry rdev_errors =
2820 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
2823 slot_show(struct md_rdev *rdev, char *page)
2825 if (rdev->raid_disk < 0)
2826 return sprintf(page, "none\n");
2828 return sprintf(page, "%d\n", rdev->raid_disk);
2832 slot_store(struct md_rdev *rdev, const char *buf, size_t len)
2836 int slot = simple_strtoul(buf, &e, 10);
2837 if (strncmp(buf, "none", 4)==0)
2839 else if (e==buf || (*e && *e!= '\n'))
2841 if (rdev->mddev->pers && slot == -1) {
2842 /* Setting 'slot' on an active array requires also
2843 * updating the 'rd%d' link, and communicating
2844 * with the personality with ->hot_*_disk.
2845 * For now we only support removing
2846 * failed/spare devices. This normally happens automatically,
2847 * but not when the metadata is externally managed.
2849 if (rdev->raid_disk == -1)
2851 /* personality does all needed checks */
2852 if (rdev->mddev->pers->hot_remove_disk == NULL)
2854 err = rdev->mddev->pers->
2855 hot_remove_disk(rdev->mddev, rdev);
2858 sysfs_unlink_rdev(rdev->mddev, rdev);
2859 rdev->raid_disk = -1;
2860 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2861 md_wakeup_thread(rdev->mddev->thread);
2862 } else if (rdev->mddev->pers) {
2863 /* Activating a spare .. or possibly reactivating
2864 * if we ever get bitmaps working here.
2867 if (rdev->raid_disk != -1)
2870 if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery))
2873 if (rdev->mddev->pers->hot_add_disk == NULL)
2876 if (slot >= rdev->mddev->raid_disks &&
2877 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
2880 rdev->raid_disk = slot;
2881 if (test_bit(In_sync, &rdev->flags))
2882 rdev->saved_raid_disk = slot;
2884 rdev->saved_raid_disk = -1;
2885 clear_bit(In_sync, &rdev->flags);
2886 err = rdev->mddev->pers->
2887 hot_add_disk(rdev->mddev, rdev);
2889 rdev->raid_disk = -1;
2892 sysfs_notify_dirent_safe(rdev->sysfs_state);
2893 if (sysfs_link_rdev(rdev->mddev, rdev))
2894 /* failure here is OK */;
2895 /* don't wakeup anyone, leave that to userspace. */
2897 if (slot >= rdev->mddev->raid_disks &&
2898 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
2900 rdev->raid_disk = slot;
2901 /* assume it is working */
2902 clear_bit(Faulty, &rdev->flags);
2903 clear_bit(WriteMostly, &rdev->flags);
2904 set_bit(In_sync, &rdev->flags);
2905 sysfs_notify_dirent_safe(rdev->sysfs_state);
2911 static struct rdev_sysfs_entry rdev_slot =
2912 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
2915 offset_show(struct md_rdev *rdev, char *page)
2917 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
2921 offset_store(struct md_rdev *rdev, const char *buf, size_t len)
2923 unsigned long long offset;
2924 if (strict_strtoull(buf, 10, &offset) < 0)
2926 if (rdev->mddev->pers && rdev->raid_disk >= 0)
2928 if (rdev->sectors && rdev->mddev->external)
2929 /* Must set offset before size, so overlap checks
2932 rdev->data_offset = offset;
2936 static struct rdev_sysfs_entry rdev_offset =
2937 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
2939 static ssize_t new_offset_show(struct md_rdev *rdev, char *page)
2941 return sprintf(page, "%llu\n",
2942 (unsigned long long)rdev->new_data_offset);
2945 static ssize_t new_offset_store(struct md_rdev *rdev,
2946 const char *buf, size_t len)
2948 unsigned long long new_offset;
2949 struct mddev *mddev = rdev->mddev;
2951 if (strict_strtoull(buf, 10, &new_offset) < 0)
2954 if (mddev->sync_thread)
2956 if (new_offset == rdev->data_offset)
2957 /* reset is always permitted */
2959 else if (new_offset > rdev->data_offset) {
2960 /* must not push array size beyond rdev_sectors */
2961 if (new_offset - rdev->data_offset
2962 + mddev->dev_sectors > rdev->sectors)
2965 /* Metadata worries about other space details. */
2967 /* decreasing the offset is inconsistent with a backwards
2970 if (new_offset < rdev->data_offset &&
2971 mddev->reshape_backwards)
2973 /* Increasing offset is inconsistent with forwards
2974 * reshape. reshape_direction should be set to
2975 * 'backwards' first.
2977 if (new_offset > rdev->data_offset &&
2978 !mddev->reshape_backwards)
2981 if (mddev->pers && mddev->persistent &&
2982 !super_types[mddev->major_version]
2983 .allow_new_offset(rdev, new_offset))
2985 rdev->new_data_offset = new_offset;
2986 if (new_offset > rdev->data_offset)
2987 mddev->reshape_backwards = 1;
2988 else if (new_offset < rdev->data_offset)
2989 mddev->reshape_backwards = 0;
2993 static struct rdev_sysfs_entry rdev_new_offset =
2994 __ATTR(new_offset, S_IRUGO|S_IWUSR, new_offset_show, new_offset_store);
2997 rdev_size_show(struct md_rdev *rdev, char *page)
2999 return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2);
3002 static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
3004 /* check if two start/length pairs overlap */
3012 static int strict_blocks_to_sectors(const char *buf, sector_t *sectors)
3014 unsigned long long blocks;
3017 if (strict_strtoull(buf, 10, &blocks) < 0)
3020 if (blocks & 1ULL << (8 * sizeof(blocks) - 1))
3021 return -EINVAL; /* sector conversion overflow */
3024 if (new != blocks * 2)
3025 return -EINVAL; /* unsigned long long to sector_t overflow */
3032 rdev_size_store(struct md_rdev *rdev, const char *buf, size_t len)
3034 struct mddev *my_mddev = rdev->mddev;
3035 sector_t oldsectors = rdev->sectors;
3038 if (strict_blocks_to_sectors(buf, §ors) < 0)
3040 if (rdev->data_offset != rdev->new_data_offset)
3041 return -EINVAL; /* too confusing */
3042 if (my_mddev->pers && rdev->raid_disk >= 0) {
3043 if (my_mddev->persistent) {
3044 sectors = super_types[my_mddev->major_version].
3045 rdev_size_change(rdev, sectors);
3048 } else if (!sectors)
3049 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) -
3052 if (sectors < my_mddev->dev_sectors)
3053 return -EINVAL; /* component must fit device */
3055 rdev->sectors = sectors;
3056 if (sectors > oldsectors && my_mddev->external) {
3057 /* need to check that all other rdevs with the same ->bdev
3058 * do not overlap. We need to unlock the mddev to avoid
3059 * a deadlock. We have already changed rdev->sectors, and if
3060 * we have to change it back, we will have the lock again.
3062 struct mddev *mddev;
3064 struct list_head *tmp;
3066 mddev_unlock(my_mddev);
3067 for_each_mddev(mddev, tmp) {
3068 struct md_rdev *rdev2;
3071 rdev_for_each(rdev2, mddev)
3072 if (rdev->bdev == rdev2->bdev &&
3074 overlaps(rdev->data_offset, rdev->sectors,
3080 mddev_unlock(mddev);
3086 mddev_lock(my_mddev);
3088 /* Someone else could have slipped in a size
3089 * change here, but doing so is just silly.
3090 * We put oldsectors back because we *know* it is
3091 * safe, and trust userspace not to race with
3094 rdev->sectors = oldsectors;
3101 static struct rdev_sysfs_entry rdev_size =
3102 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
3105 static ssize_t recovery_start_show(struct md_rdev *rdev, char *page)
3107 unsigned long long recovery_start = rdev->recovery_offset;
3109 if (test_bit(In_sync, &rdev->flags) ||
3110 recovery_start == MaxSector)
3111 return sprintf(page, "none\n");
3113 return sprintf(page, "%llu\n", recovery_start);
3116 static ssize_t recovery_start_store(struct md_rdev *rdev, const char *buf, size_t len)
3118 unsigned long long recovery_start;
3120 if (cmd_match(buf, "none"))
3121 recovery_start = MaxSector;
3122 else if (strict_strtoull(buf, 10, &recovery_start))
3125 if (rdev->mddev->pers &&
3126 rdev->raid_disk >= 0)
3129 rdev->recovery_offset = recovery_start;
3130 if (recovery_start == MaxSector)
3131 set_bit(In_sync, &rdev->flags);
3133 clear_bit(In_sync, &rdev->flags);
3137 static struct rdev_sysfs_entry rdev_recovery_start =
3138 __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store);
3142 badblocks_show(struct badblocks *bb, char *page, int unack);
3144 badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack);
3146 static ssize_t bb_show(struct md_rdev *rdev, char *page)
3148 return badblocks_show(&rdev->badblocks, page, 0);
3150 static ssize_t bb_store(struct md_rdev *rdev, const char *page, size_t len)
3152 int rv = badblocks_store(&rdev->badblocks, page, len, 0);
3153 /* Maybe that ack was all we needed */
3154 if (test_and_clear_bit(BlockedBadBlocks, &rdev->flags))
3155 wake_up(&rdev->blocked_wait);
3158 static struct rdev_sysfs_entry rdev_bad_blocks =
3159 __ATTR(bad_blocks, S_IRUGO|S_IWUSR, bb_show, bb_store);
3162 static ssize_t ubb_show(struct md_rdev *rdev, char *page)
3164 return badblocks_show(&rdev->badblocks, page, 1);
3166 static ssize_t ubb_store(struct md_rdev *rdev, const char *page, size_t len)
3168 return badblocks_store(&rdev->badblocks, page, len, 1);
3170 static struct rdev_sysfs_entry rdev_unack_bad_blocks =
3171 __ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store);
3173 static struct attribute *rdev_default_attrs[] = {
3178 &rdev_new_offset.attr,
3180 &rdev_recovery_start.attr,
3181 &rdev_bad_blocks.attr,
3182 &rdev_unack_bad_blocks.attr,
3186 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
3188 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3189 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3190 struct mddev *mddev = rdev->mddev;
3196 rv = mddev ? mddev_lock(mddev) : -EBUSY;
3198 if (rdev->mddev == NULL)
3201 rv = entry->show(rdev, page);
3202 mddev_unlock(mddev);
3208 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
3209 const char *page, size_t length)
3211 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3212 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3214 struct mddev *mddev = rdev->mddev;
3218 if (!capable(CAP_SYS_ADMIN))
3220 rv = mddev ? mddev_lock(mddev): -EBUSY;
3222 if (rdev->mddev == NULL)
3225 rv = entry->store(rdev, page, length);
3226 mddev_unlock(mddev);
3231 static void rdev_free(struct kobject *ko)
3233 struct md_rdev *rdev = container_of(ko, struct md_rdev, kobj);
3236 static const struct sysfs_ops rdev_sysfs_ops = {
3237 .show = rdev_attr_show,
3238 .store = rdev_attr_store,
3240 static struct kobj_type rdev_ktype = {
3241 .release = rdev_free,
3242 .sysfs_ops = &rdev_sysfs_ops,
3243 .default_attrs = rdev_default_attrs,
3246 int md_rdev_init(struct md_rdev *rdev)
3249 rdev->saved_raid_disk = -1;
3250 rdev->raid_disk = -1;
3252 rdev->data_offset = 0;
3253 rdev->new_data_offset = 0;
3254 rdev->sb_events = 0;
3255 rdev->last_read_error.tv_sec = 0;
3256 rdev->last_read_error.tv_nsec = 0;
3257 rdev->sb_loaded = 0;
3258 rdev->bb_page = NULL;
3259 atomic_set(&rdev->nr_pending, 0);
3260 atomic_set(&rdev->read_errors, 0);
3261 atomic_set(&rdev->corrected_errors, 0);
3263 INIT_LIST_HEAD(&rdev->same_set);
3264 init_waitqueue_head(&rdev->blocked_wait);
3266 /* Add space to store bad block list.
3267 * This reserves the space even on arrays where it cannot
3268 * be used - I wonder if that matters
3270 rdev->badblocks.count = 0;
3271 rdev->badblocks.shift = 0;
3272 rdev->badblocks.page = kmalloc(PAGE_SIZE, GFP_KERNEL);
3273 seqlock_init(&rdev->badblocks.lock);
3274 if (rdev->badblocks.page == NULL)
3279 EXPORT_SYMBOL_GPL(md_rdev_init);
3281 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3283 * mark the device faulty if:
3285 * - the device is nonexistent (zero size)
3286 * - the device has no valid superblock
3288 * a faulty rdev _never_ has rdev->sb set.
3290 static struct md_rdev *md_import_device(dev_t newdev, int super_format, int super_minor)
3292 char b[BDEVNAME_SIZE];
3294 struct md_rdev *rdev;
3297 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
3299 printk(KERN_ERR "md: could not alloc mem for new device!\n");
3300 return ERR_PTR(-ENOMEM);
3303 err = md_rdev_init(rdev);
3306 err = alloc_disk_sb(rdev);
3310 err = lock_rdev(rdev, newdev, super_format == -2);
3314 kobject_init(&rdev->kobj, &rdev_ktype);
3316 size = i_size_read(rdev->bdev->bd_inode) >> BLOCK_SIZE_BITS;
3319 "md: %s has zero or unknown size, marking faulty!\n",
3320 bdevname(rdev->bdev,b));
3325 if (super_format >= 0) {
3326 err = super_types[super_format].
3327 load_super(rdev, NULL, super_minor);
3328 if (err == -EINVAL) {
3330 "md: %s does not have a valid v%d.%d "
3331 "superblock, not importing!\n",
3332 bdevname(rdev->bdev,b),
3333 super_format, super_minor);
3338 "md: could not read %s's sb, not importing!\n",
3339 bdevname(rdev->bdev,b));
3343 if (super_format == -1)
3344 /* hot-add for 0.90, or non-persistent: so no badblocks */
3345 rdev->badblocks.shift = -1;
3352 md_rdev_clear(rdev);
3354 return ERR_PTR(err);
3358 * Check a full RAID array for plausibility
3362 static void analyze_sbs(struct mddev * mddev)
3365 struct md_rdev *rdev, *freshest, *tmp;
3366 char b[BDEVNAME_SIZE];
3369 rdev_for_each_safe(rdev, tmp, mddev)
3370 switch (super_types[mddev->major_version].
3371 load_super(rdev, freshest, mddev->minor_version)) {
3379 "md: fatal superblock inconsistency in %s"
3380 " -- removing from array\n",
3381 bdevname(rdev->bdev,b));
3382 kick_rdev_from_array(rdev);
3386 super_types[mddev->major_version].
3387 validate_super(mddev, freshest);
3390 rdev_for_each_safe(rdev, tmp, mddev) {
3391 if (mddev->max_disks &&
3392 (rdev->desc_nr >= mddev->max_disks ||
3393 i > mddev->max_disks)) {
3395 "md: %s: %s: only %d devices permitted\n",
3396 mdname(mddev), bdevname(rdev->bdev, b),
3398 kick_rdev_from_array(rdev);
3401 if (rdev != freshest)
3402 if (super_types[mddev->major_version].
3403 validate_super(mddev, rdev)) {
3404 printk(KERN_WARNING "md: kicking non-fresh %s"
3406 bdevname(rdev->bdev,b));
3407 kick_rdev_from_array(rdev);
3410 if (mddev->level == LEVEL_MULTIPATH) {
3411 rdev->desc_nr = i++;
3412 rdev->raid_disk = rdev->desc_nr;
3413 set_bit(In_sync, &rdev->flags);
3414 } else if (rdev->raid_disk >= (mddev->raid_disks - min(0, mddev->delta_disks))) {
3415 rdev->raid_disk = -1;
3416 clear_bit(In_sync, &rdev->flags);
3421 /* Read a fixed-point number.
3422 * Numbers in sysfs attributes should be in "standard" units where
3423 * possible, so time should be in seconds.
3424 * However we internally use a a much smaller unit such as
3425 * milliseconds or jiffies.
3426 * This function takes a decimal number with a possible fractional
3427 * component, and produces an integer which is the result of
3428 * multiplying that number by 10^'scale'.
3429 * all without any floating-point arithmetic.
3431 int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale)
3433 unsigned long result = 0;
3435 while (isdigit(*cp) || (*cp == '.' && decimals < 0)) {
3438 else if (decimals < scale) {
3441 result = result * 10 + value;
3453 while (decimals < scale) {
3462 static void md_safemode_timeout(unsigned long data);
3465 safe_delay_show(struct mddev *mddev, char *page)
3467 int msec = (mddev->safemode_delay*1000)/HZ;
3468 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
3471 safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len)
3475 if (strict_strtoul_scaled(cbuf, &msec, 3) < 0)
3478 mddev->safemode_delay = 0;
3480 unsigned long old_delay = mddev->safemode_delay;
3481 mddev->safemode_delay = (msec*HZ)/1000;
3482 if (mddev->safemode_delay == 0)
3483 mddev->safemode_delay = 1;
3484 if (mddev->safemode_delay < old_delay)
3485 md_safemode_timeout((unsigned long)mddev);
3489 static struct md_sysfs_entry md_safe_delay =
3490 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
3493 level_show(struct mddev *mddev, char *page)
3495 struct md_personality *p = mddev->pers;
3497 return sprintf(page, "%s\n", p->name);
3498 else if (mddev->clevel[0])
3499 return sprintf(page, "%s\n", mddev->clevel);
3500 else if (mddev->level != LEVEL_NONE)
3501 return sprintf(page, "%d\n", mddev->level);
3507 level_store(struct mddev *mddev, const char *buf, size_t len)
3511 struct md_personality *pers;
3514 struct md_rdev *rdev;
3516 if (mddev->pers == NULL) {
3519 if (len >= sizeof(mddev->clevel))
3521 strncpy(mddev->clevel, buf, len);
3522 if (mddev->clevel[len-1] == '\n')
3524 mddev->clevel[len] = 0;
3525 mddev->level = LEVEL_NONE;
3529 /* request to change the personality. Need to ensure:
3530 * - array is not engaged in resync/recovery/reshape
3531 * - old personality can be suspended
3532 * - new personality will access other array.
3535 if (mddev->sync_thread ||
3536 mddev->reshape_position != MaxSector ||
3537 mddev->sysfs_active)
3540 if (!mddev->pers->quiesce) {
3541 printk(KERN_WARNING "md: %s: %s does not support online personality change\n",
3542 mdname(mddev), mddev->pers->name);
3546 /* Now find the new personality */
3547 if (len == 0 || len >= sizeof(clevel))
3549 strncpy(clevel, buf, len);
3550 if (clevel[len-1] == '\n')
3553 if (strict_strtol(clevel, 10, &level))
3556 if (request_module("md-%s", clevel) != 0)
3557 request_module("md-level-%s", clevel);
3558 spin_lock(&pers_lock);
3559 pers = find_pers(level, clevel);
3560 if (!pers || !try_module_get(pers->owner)) {
3561 spin_unlock(&pers_lock);
3562 printk(KERN_WARNING "md: personality %s not loaded\n", clevel);
3565 spin_unlock(&pers_lock);
3567 if (pers == mddev->pers) {
3568 /* Nothing to do! */
3569 module_put(pers->owner);
3572 if (!pers->takeover) {
3573 module_put(pers->owner);
3574 printk(KERN_WARNING "md: %s: %s does not support personality takeover\n",
3575 mdname(mddev), clevel);
3579 rdev_for_each(rdev, mddev)
3580 rdev->new_raid_disk = rdev->raid_disk;
3582 /* ->takeover must set new_* and/or delta_disks
3583 * if it succeeds, and may set them when it fails.
3585 priv = pers->takeover(mddev);
3587 mddev->new_level = mddev->level;
3588 mddev->new_layout = mddev->layout;
3589 mddev->new_chunk_sectors = mddev->chunk_sectors;
3590 mddev->raid_disks -= mddev->delta_disks;
3591 mddev->delta_disks = 0;
3592 mddev->reshape_backwards = 0;
3593 module_put(pers->owner);
3594 printk(KERN_WARNING "md: %s: %s would not accept array\n",
3595 mdname(mddev), clevel);
3596 return PTR_ERR(priv);
3599 /* Looks like we have a winner */
3600 mddev_suspend(mddev);
3601 mddev->pers->stop(mddev);
3603 if (mddev->pers->sync_request == NULL &&
3604 pers->sync_request != NULL) {
3605 /* need to add the md_redundancy_group */
3606 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
3608 "md: cannot register extra attributes for %s\n",
3610 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, NULL, "sync_action");
3612 if (mddev->pers->sync_request != NULL &&
3613 pers->sync_request == NULL) {
3614 /* need to remove the md_redundancy_group */
3615 if (mddev->to_remove == NULL)
3616 mddev->to_remove = &md_redundancy_group;
3619 if (mddev->pers->sync_request == NULL &&
3621 /* We are converting from a no-redundancy array
3622 * to a redundancy array and metadata is managed
3623 * externally so we need to be sure that writes
3624 * won't block due to a need to transition
3626 * until external management is started.
3629 mddev->safemode_delay = 0;
3630 mddev->safemode = 0;
3633 rdev_for_each(rdev, mddev) {
3634 if (rdev->raid_disk < 0)
3636 if (rdev->new_raid_disk >= mddev->raid_disks)
3637 rdev->new_raid_disk = -1;
3638 if (rdev->new_raid_disk == rdev->raid_disk)
3640 sysfs_unlink_rdev(mddev, rdev);
3642 rdev_for_each(rdev, mddev) {
3643 if (rdev->raid_disk < 0)
3645 if (rdev->new_raid_disk == rdev->raid_disk)
3647 rdev->raid_disk = rdev->new_raid_disk;
3648 if (rdev->raid_disk < 0)
3649 clear_bit(In_sync, &rdev->flags);
3651 if (sysfs_link_rdev(mddev, rdev))
3652 printk(KERN_WARNING "md: cannot register rd%d"
3653 " for %s after level change\n",
3654 rdev->raid_disk, mdname(mddev));
3658 module_put(mddev->pers->owner);
3660 mddev->private = priv;
3661 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
3662 mddev->level = mddev->new_level;
3663 mddev->layout = mddev->new_layout;
3664 mddev->chunk_sectors = mddev->new_chunk_sectors;
3665 mddev->delta_disks = 0;
3666 mddev->reshape_backwards = 0;
3667 mddev->degraded = 0;
3668 if (mddev->pers->sync_request == NULL) {
3669 /* this is now an array without redundancy, so
3670 * it must always be in_sync
3673 del_timer_sync(&mddev->safemode_timer);
3676 mddev_resume(mddev);
3677 set_bit(MD_CHANGE_DEVS, &mddev->flags);
3678 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3679 md_wakeup_thread(mddev->thread);
3680 sysfs_notify(&mddev->kobj, NULL, "level");
3681 md_new_event(mddev);
3685 static struct md_sysfs_entry md_level =
3686 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
3690 layout_show(struct mddev *mddev, char *page)
3692 /* just a number, not meaningful for all levels */
3693 if (mddev->reshape_position != MaxSector &&
3694 mddev->layout != mddev->new_layout)
3695 return sprintf(page, "%d (%d)\n",
3696 mddev->new_layout, mddev->layout);
3697 return sprintf(page, "%d\n", mddev->layout);
3701 layout_store(struct mddev *mddev, const char *buf, size_t len)
3704 unsigned long n = simple_strtoul(buf, &e, 10);
3706 if (!*buf || (*e && *e != '\n'))
3711 if (mddev->pers->check_reshape == NULL)
3713 mddev->new_layout = n;
3714 err = mddev->pers->check_reshape(mddev);
3716 mddev->new_layout = mddev->layout;
3720 mddev->new_layout = n;
3721 if (mddev->reshape_position == MaxSector)
3726 static struct md_sysfs_entry md_layout =
3727 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
3731 raid_disks_show(struct mddev *mddev, char *page)
3733 if (mddev->raid_disks == 0)
3735 if (mddev->reshape_position != MaxSector &&
3736 mddev->delta_disks != 0)
3737 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
3738 mddev->raid_disks - mddev->delta_disks);
3739 return sprintf(page, "%d\n", mddev->raid_disks);
3742 static int update_raid_disks(struct mddev *mddev, int raid_disks);
3745 raid_disks_store(struct mddev *mddev, const char *buf, size_t len)
3749 unsigned long n = simple_strtoul(buf, &e, 10);
3751 if (!*buf || (*e && *e != '\n'))
3755 rv = update_raid_disks(mddev, n);
3756 else if (mddev->reshape_position != MaxSector) {
3757 struct md_rdev *rdev;
3758 int olddisks = mddev->raid_disks - mddev->delta_disks;
3760 rdev_for_each(rdev, mddev) {
3762 rdev->data_offset < rdev->new_data_offset)
3765 rdev->data_offset > rdev->new_data_offset)
3768 mddev->delta_disks = n - olddisks;
3769 mddev->raid_disks = n;
3770 mddev->reshape_backwards = (mddev->delta_disks < 0);
3772 mddev->raid_disks = n;
3773 return rv ? rv : len;
3775 static struct md_sysfs_entry md_raid_disks =
3776 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
3779 chunk_size_show(struct mddev *mddev, char *page)
3781 if (mddev->reshape_position != MaxSector &&
3782 mddev->chunk_sectors != mddev->new_chunk_sectors)
3783 return sprintf(page, "%d (%d)\n",
3784 mddev->new_chunk_sectors << 9,
3785 mddev->chunk_sectors << 9);
3786 return sprintf(page, "%d\n", mddev->chunk_sectors << 9);
3790 chunk_size_store(struct mddev *mddev, const char *buf, size_t len)
3793 unsigned long n = simple_strtoul(buf, &e, 10);
3795 if (!*buf || (*e && *e != '\n'))
3800 if (mddev->pers->check_reshape == NULL)
3802 mddev->new_chunk_sectors = n >> 9;
3803 err = mddev->pers->check_reshape(mddev);
3805 mddev->new_chunk_sectors = mddev->chunk_sectors;
3809 mddev->new_chunk_sectors = n >> 9;
3810 if (mddev->reshape_position == MaxSector)
3811 mddev->chunk_sectors = n >> 9;
3815 static struct md_sysfs_entry md_chunk_size =
3816 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
3819 resync_start_show(struct mddev *mddev, char *page)
3821 if (mddev->recovery_cp == MaxSector)
3822 return sprintf(page, "none\n");
3823 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
3827 resync_start_store(struct mddev *mddev, const char *buf, size_t len)
3830 unsigned long long n = simple_strtoull(buf, &e, 10);
3832 if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
3834 if (cmd_match(buf, "none"))
3836 else if (!*buf || (*e && *e != '\n'))
3839 mddev->recovery_cp = n;
3842 static struct md_sysfs_entry md_resync_start =
3843 __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store);
3846 * The array state can be:
3849 * No devices, no size, no level
3850 * Equivalent to STOP_ARRAY ioctl
3852 * May have some settings, but array is not active
3853 * all IO results in error
3854 * When written, doesn't tear down array, but just stops it
3855 * suspended (not supported yet)
3856 * All IO requests will block. The array can be reconfigured.
3857 * Writing this, if accepted, will block until array is quiescent
3859 * no resync can happen. no superblocks get written.
3860 * write requests fail
3862 * like readonly, but behaves like 'clean' on a write request.
3864 * clean - no pending writes, but otherwise active.
3865 * When written to inactive array, starts without resync
3866 * If a write request arrives then
3867 * if metadata is known, mark 'dirty' and switch to 'active'.
3868 * if not known, block and switch to write-pending
3869 * If written to an active array that has pending writes, then fails.
3871 * fully active: IO and resync can be happening.
3872 * When written to inactive array, starts with resync
3875 * clean, but writes are blocked waiting for 'active' to be written.
3878 * like active, but no writes have been seen for a while (100msec).
3881 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
3882 write_pending, active_idle, bad_word};
3883 static char *array_states[] = {
3884 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3885 "write-pending", "active-idle", NULL };
3887 static int match_word(const char *word, char **list)
3890 for (n=0; list[n]; n++)
3891 if (cmd_match(word, list[n]))
3897 array_state_show(struct mddev *mddev, char *page)
3899 enum array_state st = inactive;
3912 else if (test_bit(MD_CHANGE_PENDING, &mddev->flags))
3914 else if (mddev->safemode)
3920 if (list_empty(&mddev->disks) &&
3921 mddev->raid_disks == 0 &&
3922 mddev->dev_sectors == 0)
3927 return sprintf(page, "%s\n", array_states[st]);
3930 static int do_md_stop(struct mddev * mddev, int ro, int is_open);
3931 static int md_set_readonly(struct mddev * mddev, int is_open);
3932 static int do_md_run(struct mddev * mddev);
3933 static int restart_array(struct mddev *mddev);
3936 array_state_store(struct mddev *mddev, const char *buf, size_t len)
3939 enum array_state st = match_word(buf, array_states);
3944 /* stopping an active array */
3945 if (atomic_read(&mddev->openers) > 0)
3947 err = do_md_stop(mddev, 0, 0);
3950 /* stopping an active array */
3952 if (atomic_read(&mddev->openers) > 0)
3954 err = do_md_stop(mddev, 2, 0);
3956 err = 0; /* already inactive */
3959 break; /* not supported yet */
3962 err = md_set_readonly(mddev, 0);
3965 set_disk_ro(mddev->gendisk, 1);
3966 err = do_md_run(mddev);
3972 err = md_set_readonly(mddev, 0);
3973 else if (mddev->ro == 1)
3974 err = restart_array(mddev);
3977 set_disk_ro(mddev->gendisk, 0);
3981 err = do_md_run(mddev);
3986 restart_array(mddev);
3987 spin_lock_irq(&mddev->write_lock);
3988 if (atomic_read(&mddev->writes_pending) == 0) {
3989 if (mddev->in_sync == 0) {
3991 if (mddev->safemode == 1)
3992 mddev->safemode = 0;
3993 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
3998 spin_unlock_irq(&mddev->write_lock);
4004 restart_array(mddev);
4005 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
4006 wake_up(&mddev->sb_wait);
4010 set_disk_ro(mddev->gendisk, 0);
4011 err = do_md_run(mddev);
4016 /* these cannot be set */
4022 if (mddev->hold_active == UNTIL_IOCTL)
4023 mddev->hold_active = 0;
4024 sysfs_notify_dirent_safe(mddev->sysfs_state);
4028 static struct md_sysfs_entry md_array_state =
4029 __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
4032 max_corrected_read_errors_show(struct mddev *mddev, char *page) {
4033 return sprintf(page, "%d\n",
4034 atomic_read(&mddev->max_corr_read_errors));
4038 max_corrected_read_errors_store(struct mddev *mddev, const char *buf, size_t len)
4041 unsigned long n = simple_strtoul(buf, &e, 10);
4043 if (*buf && (*e == 0 || *e == '\n')) {
4044 atomic_set(&mddev->max_corr_read_errors, n);
4050 static struct md_sysfs_entry max_corr_read_errors =
4051 __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show,
4052 max_corrected_read_errors_store);
4055 null_show(struct mddev *mddev, char *page)
4061 new_dev_store(struct mddev *mddev, const char *buf, size_t len)
4063 /* buf must be %d:%d\n? giving major and minor numbers */
4064 /* The new device is added to the array.
4065 * If the array has a persistent superblock, we read the
4066 * superblock to initialise info and check validity.
4067 * Otherwise, only checking done is that in bind_rdev_to_array,
4068 * which mainly checks size.
4071 int major = simple_strtoul(buf, &e, 10);
4074 struct md_rdev *rdev;
4077 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
4079 minor = simple_strtoul(e+1, &e, 10);
4080 if (*e && *e != '\n')
4082 dev = MKDEV(major, minor);
4083 if (major != MAJOR(dev) ||
4084 minor != MINOR(dev))
4088 if (mddev->persistent) {
4089 rdev = md_import_device(dev, mddev->major_version,
4090 mddev->minor_version);
4091 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
4092 struct md_rdev *rdev0
4093 = list_entry(mddev->disks.next,
4094 struct md_rdev, same_set);
4095 err = super_types[mddev->major_version]
4096 .load_super(rdev, rdev0, mddev->minor_version);
4100 } else if (mddev->external)
4101 rdev = md_import_device(dev, -2, -1);
4103 rdev = md_import_device(dev, -1, -1);
4106 return PTR_ERR(rdev);
4107 err = bind_rdev_to_array(rdev, mddev);
4111 return err ? err : len;
4114 static struct md_sysfs_entry md_new_device =
4115 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
4118 bitmap_store(struct mddev *mddev, const char *buf, size_t len)
4121 unsigned long chunk, end_chunk;
4125 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
4127 chunk = end_chunk = simple_strtoul(buf, &end, 0);
4128 if (buf == end) break;
4129 if (*end == '-') { /* range */
4131 end_chunk = simple_strtoul(buf, &end, 0);
4132 if (buf == end) break;
4134 if (*end && !isspace(*end)) break;
4135 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
4136 buf = skip_spaces(end);
4138 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
4143 static struct md_sysfs_entry md_bitmap =
4144 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
4147 size_show(struct mddev *mddev, char *page)
4149 return sprintf(page, "%llu\n",
4150 (unsigned long long)mddev->dev_sectors / 2);
4153 static int update_size(struct mddev *mddev, sector_t num_sectors);
4156 size_store(struct mddev *mddev, const char *buf, size_t len)
4158 /* If array is inactive, we can reduce the component size, but
4159 * not increase it (except from 0).
4160 * If array is active, we can try an on-line resize
4163 int err = strict_blocks_to_sectors(buf, §ors);
4168 err = update_size(mddev, sectors);
4169 md_update_sb(mddev, 1);
4171 if (mddev->dev_sectors == 0 ||
4172 mddev->dev_sectors > sectors)
4173 mddev->dev_sectors = sectors;
4177 return err ? err : len;
4180 static struct md_sysfs_entry md_size =
4181 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
4186 * 'none' for arrays with no metadata (good luck...)
4187 * 'external' for arrays with externally managed metadata,
4188 * or N.M for internally known formats
4191 metadata_show(struct mddev *mddev, char *page)
4193 if (mddev->persistent)
4194 return sprintf(page, "%d.%d\n",
4195 mddev->major_version, mddev->minor_version);
4196 else if (mddev->external)
4197 return sprintf(page, "external:%s\n", mddev->metadata_type);
4199 return sprintf(page, "none\n");
4203 metadata_store(struct mddev *mddev, const char *buf, size_t len)
4207 /* Changing the details of 'external' metadata is
4208 * always permitted. Otherwise there must be
4209 * no devices attached to the array.
4211 if (mddev->external && strncmp(buf, "external:", 9) == 0)
4213 else if (!list_empty(&mddev->disks))
4216 if (cmd_match(buf, "none")) {
4217 mddev->persistent = 0;
4218 mddev->external = 0;
4219 mddev->major_version = 0;
4220 mddev->minor_version = 90;
4223 if (strncmp(buf, "external:", 9) == 0) {
4224 size_t namelen = len-9;
4225 if (namelen >= sizeof(mddev->metadata_type))
4226 namelen = sizeof(mddev->metadata_type)-1;
4227 strncpy(mddev->metadata_type, buf+9, namelen);
4228 mddev->metadata_type[namelen] = 0;
4229 if (namelen && mddev->metadata_type[namelen-1] == '\n')
4230 mddev->metadata_type[--namelen] = 0;
4231 mddev->persistent = 0;
4232 mddev->external = 1;
4233 mddev->major_version = 0;
4234 mddev->minor_version = 90;
4237 major = simple_strtoul(buf, &e, 10);
4238 if (e==buf || *e != '.')
4241 minor = simple_strtoul(buf, &e, 10);
4242 if (e==buf || (*e && *e != '\n') )
4244 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
4246 mddev->major_version = major;
4247 mddev->minor_version = minor;
4248 mddev->persistent = 1;
4249 mddev->external = 0;
4253 static struct md_sysfs_entry md_metadata =
4254 __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
4257 action_show(struct mddev *mddev, char *page)
4259 char *type = "idle";
4260 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
4262 else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
4263 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) {
4264 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
4266 else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
4267 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
4269 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
4273 } else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
4276 return sprintf(page, "%s\n", type);
4279 static void reap_sync_thread(struct mddev *mddev);
4282 action_store(struct mddev *mddev, const char *page, size_t len)
4284 if (!mddev->pers || !mddev->pers->sync_request)
4287 if (cmd_match(page, "frozen"))
4288 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4290 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4292 if (cmd_match(page, "idle") || cmd_match(page, "frozen")) {
4293 if (mddev->sync_thread) {
4294 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4295 reap_sync_thread(mddev);
4297 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
4298 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
4300 else if (cmd_match(page, "resync"))
4301 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4302 else if (cmd_match(page, "recover")) {
4303 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
4304 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4305 } else if (cmd_match(page, "reshape")) {
4307 if (mddev->pers->start_reshape == NULL)
4309 err = mddev->pers->start_reshape(mddev);
4312 sysfs_notify(&mddev->kobj, NULL, "degraded");
4314 if (cmd_match(page, "check"))
4315 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
4316 else if (!cmd_match(page, "repair"))
4318 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
4319 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
4321 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4322 md_wakeup_thread(mddev->thread);
4323 sysfs_notify_dirent_safe(mddev->sysfs_action);
4328 mismatch_cnt_show(struct mddev *mddev, char *page)
4330 return sprintf(page, "%llu\n",
4331 (unsigned long long) mddev->resync_mismatches);
4334 static struct md_sysfs_entry md_scan_mode =
4335 __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
4338 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
4341 sync_min_show(struct mddev *mddev, char *page)
4343 return sprintf(page, "%d (%s)\n", speed_min(mddev),
4344 mddev->sync_speed_min ? "local": "system");
4348 sync_min_store(struct mddev *mddev, const char *buf, size_t len)
4352 if (strncmp(buf, "system", 6)==0) {
4353 mddev->sync_speed_min = 0;
4356 min = simple_strtoul(buf, &e, 10);
4357 if (buf == e || (*e && *e != '\n') || min <= 0)
4359 mddev->sync_speed_min = min;
4363 static struct md_sysfs_entry md_sync_min =
4364 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
4367 sync_max_show(struct mddev *mddev, char *page)
4369 return sprintf(page, "%d (%s)\n", speed_max(mddev),
4370 mddev->sync_speed_max ? "local": "system");
4374 sync_max_store(struct mddev *mddev, const char *buf, size_t len)
4378 if (strncmp(buf, "system", 6)==0) {
4379 mddev->sync_speed_max = 0;
4382 max = simple_strtoul(buf, &e, 10);
4383 if (buf == e || (*e && *e != '\n') || max <= 0)
4385 mddev->sync_speed_max = max;
4389 static struct md_sysfs_entry md_sync_max =
4390 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
4393 degraded_show(struct mddev *mddev, char *page)
4395 return sprintf(page, "%d\n", mddev->degraded);
4397 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
4400 sync_force_parallel_show(struct mddev *mddev, char *page)
4402 return sprintf(page, "%d\n", mddev->parallel_resync);
4406 sync_force_parallel_store(struct mddev *mddev, const char *buf, size_t len)
4410 if (strict_strtol(buf, 10, &n))
4413 if (n != 0 && n != 1)
4416 mddev->parallel_resync = n;
4418 if (mddev->sync_thread)
4419 wake_up(&resync_wait);
4424 /* force parallel resync, even with shared block devices */
4425 static struct md_sysfs_entry md_sync_force_parallel =
4426 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
4427 sync_force_parallel_show, sync_force_parallel_store);
4430 sync_speed_show(struct mddev *mddev, char *page)
4432 unsigned long resync, dt, db;
4433 if (mddev->curr_resync == 0)
4434 return sprintf(page, "none\n");
4435 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
4436 dt = (jiffies - mddev->resync_mark) / HZ;
4438 db = resync - mddev->resync_mark_cnt;
4439 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
4442 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
4445 sync_completed_show(struct mddev *mddev, char *page)
4447 unsigned long long max_sectors, resync;
4449 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4450 return sprintf(page, "none\n");
4452 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
4453 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
4454 max_sectors = mddev->resync_max_sectors;
4456 max_sectors = mddev->dev_sectors;
4458 resync = mddev->curr_resync_completed;
4459 return sprintf(page, "%llu / %llu\n", resync, max_sectors);
4462 static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed);
4465 min_sync_show(struct mddev *mddev, char *page)
4467 return sprintf(page, "%llu\n",
4468 (unsigned long long)mddev->resync_min);
4471 min_sync_store(struct mddev *mddev, const char *buf, size_t len)
4473 unsigned long long min;
4474 if (strict_strtoull(buf, 10, &min))
4476 if (min > mddev->resync_max)
4478 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4481 /* Must be a multiple of chunk_size */
4482 if (mddev->chunk_sectors) {
4483 sector_t temp = min;
4484 if (sector_div(temp, mddev->chunk_sectors))
4487 mddev->resync_min = min;
4492 static struct md_sysfs_entry md_min_sync =
4493 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
4496 max_sync_show(struct mddev *mddev, char *page)
4498 if (mddev->resync_max == MaxSector)
4499 return sprintf(page, "max\n");
4501 return sprintf(page, "%llu\n",
4502 (unsigned long long)mddev->resync_max);
4505 max_sync_store(struct mddev *mddev, const char *buf, size_t len)
4507 if (strncmp(buf, "max", 3) == 0)
4508 mddev->resync_max = MaxSector;
4510 unsigned long long max;
4511 if (strict_strtoull(buf, 10, &max))
4513 if (max < mddev->resync_min)
4515 if (max < mddev->resync_max &&
4517 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4520 /* Must be a multiple of chunk_size */
4521 if (mddev->chunk_sectors) {
4522 sector_t temp = max;
4523 if (sector_div(temp, mddev->chunk_sectors))
4526 mddev->resync_max = max;
4528 wake_up(&mddev->recovery_wait);
4532 static struct md_sysfs_entry md_max_sync =
4533 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
4536 suspend_lo_show(struct mddev *mddev, char *page)
4538 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
4542 suspend_lo_store(struct mddev *mddev, const char *buf, size_t len)
4545 unsigned long long new = simple_strtoull(buf, &e, 10);
4546 unsigned long long old = mddev->suspend_lo;
4548 if (mddev->pers == NULL ||
4549 mddev->pers->quiesce == NULL)
4551 if (buf == e || (*e && *e != '\n'))
4554 mddev->suspend_lo = new;
4556 /* Shrinking suspended region */
4557 mddev->pers->quiesce(mddev, 2);
4559 /* Expanding suspended region - need to wait */
4560 mddev->pers->quiesce(mddev, 1);
4561 mddev->pers->quiesce(mddev, 0);
4565 static struct md_sysfs_entry md_suspend_lo =
4566 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
4570 suspend_hi_show(struct mddev *mddev, char *page)
4572 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
4576 suspend_hi_store(struct mddev *mddev, const char *buf, size_t len)
4579 unsigned long long new = simple_strtoull(buf, &e, 10);
4580 unsigned long long old = mddev->suspend_hi;
4582 if (mddev->pers == NULL ||
4583 mddev->pers->quiesce == NULL)
4585 if (buf == e || (*e && *e != '\n'))
4588 mddev->suspend_hi = new;
4590 /* Shrinking suspended region */
4591 mddev->pers->quiesce(mddev, 2);
4593 /* Expanding suspended region - need to wait */
4594 mddev->pers->quiesce(mddev, 1);
4595 mddev->pers->quiesce(mddev, 0);
4599 static struct md_sysfs_entry md_suspend_hi =
4600 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
4603 reshape_position_show(struct mddev *mddev, char *page)
4605 if (mddev->reshape_position != MaxSector)
4606 return sprintf(page, "%llu\n",
4607 (unsigned long long)mddev->reshape_position);
4608 strcpy(page, "none\n");
4613 reshape_position_store(struct mddev *mddev, const char *buf, size_t len)
4615 struct md_rdev *rdev;
4617 unsigned long long new = simple_strtoull(buf, &e, 10);
4620 if (buf == e || (*e && *e != '\n'))
4622 mddev->reshape_position = new;
4623 mddev->delta_disks = 0;
4624 mddev->reshape_backwards = 0;
4625 mddev->new_level = mddev->level;
4626 mddev->new_layout = mddev->layout;
4627 mddev->new_chunk_sectors = mddev->chunk_sectors;
4628 rdev_for_each(rdev, mddev)
4629 rdev->new_data_offset = rdev->data_offset;
4633 static struct md_sysfs_entry md_reshape_position =
4634 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
4635 reshape_position_store);
4638 reshape_direction_show(struct mddev *mddev, char *page)
4640 return sprintf(page, "%s\n",
4641 mddev->reshape_backwards ? "backwards" : "forwards");
4645 reshape_direction_store(struct mddev *mddev, const char *buf, size_t len)
4648 if (cmd_match(buf, "forwards"))
4650 else if (cmd_match(buf, "backwards"))
4654 if (mddev->reshape_backwards == backwards)
4657 /* check if we are allowed to change */
4658 if (mddev->delta_disks)
4661 if (mddev->persistent &&
4662 mddev->major_version == 0)
4665 mddev->reshape_backwards = backwards;
4669 static struct md_sysfs_entry md_reshape_direction =
4670 __ATTR(reshape_direction, S_IRUGO|S_IWUSR, reshape_direction_show,
4671 reshape_direction_store);
4674 array_size_show(struct mddev *mddev, char *page)
4676 if (mddev->external_size)
4677 return sprintf(page, "%llu\n",
4678 (unsigned long long)mddev->array_sectors/2);
4680 return sprintf(page, "default\n");
4684 array_size_store(struct mddev *mddev, const char *buf, size_t len)
4688 if (strncmp(buf, "default", 7) == 0) {
4690 sectors = mddev->pers->size(mddev, 0, 0);
4692 sectors = mddev->array_sectors;
4694 mddev->external_size = 0;
4696 if (strict_blocks_to_sectors(buf, §ors) < 0)
4698 if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors)
4701 mddev->external_size = 1;
4704 mddev->array_sectors = sectors;
4706 set_capacity(mddev->gendisk, mddev->array_sectors);
4707 revalidate_disk(mddev->gendisk);
4712 static struct md_sysfs_entry md_array_size =
4713 __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show,
4716 static struct attribute *md_default_attrs[] = {
4719 &md_raid_disks.attr,
4720 &md_chunk_size.attr,
4722 &md_resync_start.attr,
4724 &md_new_device.attr,
4725 &md_safe_delay.attr,
4726 &md_array_state.attr,
4727 &md_reshape_position.attr,
4728 &md_reshape_direction.attr,
4729 &md_array_size.attr,
4730 &max_corr_read_errors.attr,
4734 static struct attribute *md_redundancy_attrs[] = {
4736 &md_mismatches.attr,
4739 &md_sync_speed.attr,
4740 &md_sync_force_parallel.attr,
4741 &md_sync_completed.attr,
4744 &md_suspend_lo.attr,
4745 &md_suspend_hi.attr,
4750 static struct attribute_group md_redundancy_group = {
4752 .attrs = md_redundancy_attrs,
4757 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
4759 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
4760 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
4765 spin_lock(&all_mddevs_lock);
4766 if (list_empty(&mddev->all_mddevs)) {
4767 spin_unlock(&all_mddevs_lock);
4771 spin_unlock(&all_mddevs_lock);
4773 rv = mddev_lock(mddev);
4775 rv = entry->show(mddev, page);
4776 mddev_unlock(mddev);
4783 md_attr_store(struct kobject *kobj, struct attribute *attr,
4784 const char *page, size_t length)
4786 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
4787 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
4792 if (!capable(CAP_SYS_ADMIN))
4794 spin_lock(&all_mddevs_lock);
4795 if (list_empty(&mddev->all_mddevs)) {
4796 spin_unlock(&all_mddevs_lock);
4800 spin_unlock(&all_mddevs_lock);
4801 rv = mddev_lock(mddev);
4803 rv = entry->store(mddev, page, length);
4804 mddev_unlock(mddev);
4810 static void md_free(struct kobject *ko)
4812 struct mddev *mddev = container_of(ko, struct mddev, kobj);
4814 if (mddev->sysfs_state)
4815 sysfs_put(mddev->sysfs_state);
4817 if (mddev->gendisk) {
4818 del_gendisk(mddev->gendisk);
4819 put_disk(mddev->gendisk);
4822 blk_cleanup_queue(mddev->queue);
4827 static const struct sysfs_ops md_sysfs_ops = {
4828 .show = md_attr_show,
4829 .store = md_attr_store,
4831 static struct kobj_type md_ktype = {
4833 .sysfs_ops = &md_sysfs_ops,
4834 .default_attrs = md_default_attrs,
4839 static void mddev_delayed_delete(struct work_struct *ws)
4841 struct mddev *mddev = container_of(ws, struct mddev, del_work);
4843 sysfs_remove_group(&mddev->kobj, &md_bitmap_group);
4844 kobject_del(&mddev->kobj);
4845 kobject_put(&mddev->kobj);
4848 static int md_alloc(dev_t dev, char *name)
4850 static DEFINE_MUTEX(disks_mutex);
4851 struct mddev *mddev = mddev_find(dev);
4852 struct gendisk *disk;
4861 partitioned = (MAJOR(mddev->unit) != MD_MAJOR);
4862 shift = partitioned ? MdpMinorShift : 0;
4863 unit = MINOR(mddev->unit) >> shift;
4865 /* wait for any previous instance of this device to be
4866 * completely removed (mddev_delayed_delete).
4868 flush_workqueue(md_misc_wq);
4870 mutex_lock(&disks_mutex);
4876 /* Need to ensure that 'name' is not a duplicate.
4878 struct mddev *mddev2;
4879 spin_lock(&all_mddevs_lock);
4881 list_for_each_entry(mddev2, &all_mddevs, all_mddevs)
4882 if (mddev2->gendisk &&
4883 strcmp(mddev2->gendisk->disk_name, name) == 0) {
4884 spin_unlock(&all_mddevs_lock);
4887 spin_unlock(&all_mddevs_lock);
4891 mddev->queue = blk_alloc_queue(GFP_KERNEL);
4894 mddev->queue->queuedata = mddev;
4896 blk_queue_make_request(mddev->queue, md_make_request);
4897 blk_set_stacking_limits(&mddev->queue->limits);
4899 disk = alloc_disk(1 << shift);
4901 blk_cleanup_queue(mddev->queue);
4902 mddev->queue = NULL;
4905 disk->major = MAJOR(mddev->unit);
4906 disk->first_minor = unit << shift;
4908 strcpy(disk->disk_name, name);
4909 else if (partitioned)
4910 sprintf(disk->disk_name, "md_d%d", unit);
4912 sprintf(disk->disk_name, "md%d", unit);
4913 disk->fops = &md_fops;
4914 disk->private_data = mddev;
4915 disk->queue = mddev->queue;
4916 blk_queue_flush(mddev->queue, REQ_FLUSH | REQ_FUA);
4917 /* Allow extended partitions. This makes the
4918 * 'mdp' device redundant, but we can't really
4921 disk->flags |= GENHD_FL_EXT_DEVT;
4922 mddev->gendisk = disk;
4923 /* As soon as we call add_disk(), another thread could get
4924 * through to md_open, so make sure it doesn't get too far
4926 mutex_lock(&mddev->open_mutex);
4929 error = kobject_init_and_add(&mddev->kobj, &md_ktype,
4930 &disk_to_dev(disk)->kobj, "%s", "md");
4932 /* This isn't possible, but as kobject_init_and_add is marked
4933 * __must_check, we must do something with the result
4935 printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
4939 if (mddev->kobj.sd &&
4940 sysfs_create_group(&mddev->kobj, &md_bitmap_group))
4941 printk(KERN_DEBUG "pointless warning\n");
4942 mutex_unlock(&mddev->open_mutex);
4944 mutex_unlock(&disks_mutex);
4945 if (!error && mddev->kobj.sd) {
4946 kobject_uevent(&mddev->kobj, KOBJ_ADD);
4947 mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state");
4953 static struct kobject *md_probe(dev_t dev, int *part, void *data)
4955 md_alloc(dev, NULL);
4959 static int add_named_array(const char *val, struct kernel_param *kp)
4961 /* val must be "md_*" where * is not all digits.
4962 * We allocate an array with a large free minor number, and
4963 * set the name to val. val must not already be an active name.
4965 int len = strlen(val);
4966 char buf[DISK_NAME_LEN];
4968 while (len && val[len-1] == '\n')
4970 if (len >= DISK_NAME_LEN)
4972 strlcpy(buf, val, len+1);
4973 if (strncmp(buf, "md_", 3) != 0)
4975 return md_alloc(0, buf);
4978 static void md_safemode_timeout(unsigned long data)
4980 struct mddev *mddev = (struct mddev *) data;
4982 if (!atomic_read(&mddev->writes_pending)) {
4983 mddev->safemode = 1;
4984 if (mddev->external)
4985 sysfs_notify_dirent_safe(mddev->sysfs_state);
4987 md_wakeup_thread(mddev->thread);
4990 static int start_dirty_degraded;
4992 int md_run(struct mddev *mddev)
4995 struct md_rdev *rdev;
4996 struct md_personality *pers;
4998 if (list_empty(&mddev->disks))
4999 /* cannot run an array with no devices.. */
5004 /* Cannot run until previous stop completes properly */
5005 if (mddev->sysfs_active)
5009 * Analyze all RAID superblock(s)
5011 if (!mddev->raid_disks) {
5012 if (!mddev->persistent)
5017 if (mddev->level != LEVEL_NONE)
5018 request_module("md-level-%d", mddev->level);
5019 else if (mddev->clevel[0])
5020 request_module("md-%s", mddev->clevel);
5023 * Drop all container device buffers, from now on
5024 * the only valid external interface is through the md
5027 rdev_for_each(rdev, mddev) {
5028 if (test_bit(Faulty, &rdev->flags))
5030 sync_blockdev(rdev->bdev);
5031 invalidate_bdev(rdev->bdev);
5033 /* perform some consistency tests on the device.
5034 * We don't want the data to overlap the metadata,
5035 * Internal Bitmap issues have been handled elsewhere.
5037 if (rdev->meta_bdev) {
5038 /* Nothing to check */;
5039 } else if (rdev->data_offset < rdev->sb_start) {
5040 if (mddev->dev_sectors &&
5041 rdev->data_offset + mddev->dev_sectors
5043 printk("md: %s: data overlaps metadata\n",
5048 if (rdev->sb_start + rdev->sb_size/512
5049 > rdev->data_offset) {
5050 printk("md: %s: metadata overlaps data\n",
5055 sysfs_notify_dirent_safe(rdev->sysfs_state);
5058 if (mddev->bio_set == NULL)
5059 mddev->bio_set = bioset_create(BIO_POOL_SIZE,
5060 sizeof(struct mddev *));
5062 spin_lock(&pers_lock);
5063 pers = find_pers(mddev->level, mddev->clevel);
5064 if (!pers || !try_module_get(pers->owner)) {
5065 spin_unlock(&pers_lock);
5066 if (mddev->level != LEVEL_NONE)
5067 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
5070 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
5075 spin_unlock(&pers_lock);
5076 if (mddev->level != pers->level) {
5077 mddev->level = pers->level;
5078 mddev->new_level = pers->level;
5080 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
5082 if (mddev->reshape_position != MaxSector &&
5083 pers->start_reshape == NULL) {
5084 /* This personality cannot handle reshaping... */
5086 module_put(pers->owner);
5090 if (pers->sync_request) {
5091 /* Warn if this is a potentially silly
5094 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
5095 struct md_rdev *rdev2;
5098 rdev_for_each(rdev, mddev)
5099 rdev_for_each(rdev2, mddev) {
5101 rdev->bdev->bd_contains ==
5102 rdev2->bdev->bd_contains) {
5104 "%s: WARNING: %s appears to be"
5105 " on the same physical disk as"
5108 bdevname(rdev->bdev,b),
5109 bdevname(rdev2->bdev,b2));
5116 "True protection against single-disk"
5117 " failure might be compromised.\n");
5120 mddev->recovery = 0;
5121 /* may be over-ridden by personality */
5122 mddev->resync_max_sectors = mddev->dev_sectors;
5124 mddev->ok_start_degraded = start_dirty_degraded;
5126 if (start_readonly && mddev->ro == 0)
5127 mddev->ro = 2; /* read-only, but switch on first write */
5129 err = mddev->pers->run(mddev);
5131 printk(KERN_ERR "md: pers->run() failed ...\n");
5132 else if (mddev->pers->size(mddev, 0, 0) < mddev->array_sectors) {
5133 WARN_ONCE(!mddev->external_size, "%s: default size too small,"
5134 " but 'external_size' not in effect?\n", __func__);
5136 "md: invalid array_size %llu > default size %llu\n",
5137 (unsigned long long)mddev->array_sectors / 2,
5138 (unsigned long long)mddev->pers->size(mddev, 0, 0) / 2);
5140 mddev->pers->stop(mddev);
5142 if (err == 0 && mddev->pers->sync_request &&
5143 (mddev->bitmap_info.file || mddev->bitmap_info.offset)) {
5144 err = bitmap_create(mddev);
5146 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
5147 mdname(mddev), err);
5148 mddev->pers->stop(mddev);
5152 module_put(mddev->pers->owner);
5154 bitmap_destroy(mddev);
5157 if (mddev->pers->sync_request) {
5158 if (mddev->kobj.sd &&
5159 sysfs_create_group(&mddev->kobj, &md_redundancy_group))
5161 "md: cannot register extra attributes for %s\n",
5163 mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action");
5164 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
5167 atomic_set(&mddev->writes_pending,0);
5168 atomic_set(&mddev->max_corr_read_errors,
5169 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS);
5170 mddev->safemode = 0;
5171 mddev->safemode_timer.function = md_safemode_timeout;
5172 mddev->safemode_timer.data = (unsigned long) mddev;
5173 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
5177 rdev_for_each(rdev, mddev)
5178 if (rdev->raid_disk >= 0)
5179 if (sysfs_link_rdev(mddev, rdev))
5180 /* failure here is OK */;
5182 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5185 md_update_sb(mddev, 0);
5187 md_new_event(mddev);
5188 sysfs_notify_dirent_safe(mddev->sysfs_state);
5189 sysfs_notify_dirent_safe(mddev->sysfs_action);
5190 sysfs_notify(&mddev->kobj, NULL, "degraded");
5193 EXPORT_SYMBOL_GPL(md_run);
5195 static int do_md_run(struct mddev *mddev)
5199 err = md_run(mddev);
5202 err = bitmap_load(mddev);
5204 bitmap_destroy(mddev);
5208 md_wakeup_thread(mddev->thread);
5209 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
5211 set_capacity(mddev->gendisk, mddev->array_sectors);
5212 revalidate_disk(mddev->gendisk);
5214 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
5219 static int restart_array(struct mddev *mddev)
5221 struct gendisk *disk = mddev->gendisk;
5223 /* Complain if it has no devices */
5224 if (list_empty(&mddev->disks))
5230 mddev->safemode = 0;
5232 set_disk_ro(disk, 0);
5233 printk(KERN_INFO "md: %s switched to read-write mode.\n",
5235 /* Kick recovery or resync if necessary */
5236 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5237 md_wakeup_thread(mddev->thread);
5238 md_wakeup_thread(mddev->sync_thread);
5239 sysfs_notify_dirent_safe(mddev->sysfs_state);
5243 /* similar to deny_write_access, but accounts for our holding a reference
5244 * to the file ourselves */
5245 static int deny_bitmap_write_access(struct file * file)
5247 struct inode *inode = file->f_mapping->host;
5249 spin_lock(&inode->i_lock);
5250 if (atomic_read(&inode->i_writecount) > 1) {
5251 spin_unlock(&inode->i_lock);
5254 atomic_set(&inode->i_writecount, -1);
5255 spin_unlock(&inode->i_lock);
5260 void restore_bitmap_write_access(struct file *file)
5262 struct inode *inode = file->f_mapping->host;
5264 spin_lock(&inode->i_lock);
5265 atomic_set(&inode->i_writecount, 1);
5266 spin_unlock(&inode->i_lock);
5269 static void md_clean(struct mddev *mddev)
5271 mddev->array_sectors = 0;
5272 mddev->external_size = 0;
5273 mddev->dev_sectors = 0;
5274 mddev->raid_disks = 0;
5275 mddev->recovery_cp = 0;
5276 mddev->resync_min = 0;
5277 mddev->resync_max = MaxSector;
5278 mddev->reshape_position = MaxSector;
5279 mddev->external = 0;
5280 mddev->persistent = 0;
5281 mddev->level = LEVEL_NONE;
5282 mddev->clevel[0] = 0;
5285 mddev->metadata_type[0] = 0;
5286 mddev->chunk_sectors = 0;
5287 mddev->ctime = mddev->utime = 0;
5289 mddev->max_disks = 0;
5291 mddev->can_decrease_events = 0;
5292 mddev->delta_disks = 0;
5293 mddev->reshape_backwards = 0;
5294 mddev->new_level = LEVEL_NONE;
5295 mddev->new_layout = 0;
5296 mddev->new_chunk_sectors = 0;
5297 mddev->curr_resync = 0;
5298 mddev->resync_mismatches = 0;
5299 mddev->suspend_lo = mddev->suspend_hi = 0;
5300 mddev->sync_speed_min = mddev->sync_speed_max = 0;
5301 mddev->recovery = 0;
5304 mddev->degraded = 0;
5305 mddev->safemode = 0;
5306 mddev->merge_check_needed = 0;
5307 mddev->bitmap_info.offset = 0;
5308 mddev->bitmap_info.default_offset = 0;
5309 mddev->bitmap_info.default_space = 0;
5310 mddev->bitmap_info.chunksize = 0;
5311 mddev->bitmap_info.daemon_sleep = 0;
5312 mddev->bitmap_info.max_write_behind = 0;
5315 static void __md_stop_writes(struct mddev *mddev)
5317 if (mddev->sync_thread) {
5318 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5319 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5320 reap_sync_thread(mddev);
5323 del_timer_sync(&mddev->safemode_timer);
5325 bitmap_flush(mddev);
5326 md_super_wait(mddev);
5328 if (!mddev->in_sync || mddev->flags) {
5329 /* mark array as shutdown cleanly */
5331 md_update_sb(mddev, 1);
5335 void md_stop_writes(struct mddev *mddev)
5338 __md_stop_writes(mddev);
5339 mddev_unlock(mddev);
5341 EXPORT_SYMBOL_GPL(md_stop_writes);
5343 void md_stop(struct mddev *mddev)
5346 mddev->pers->stop(mddev);
5347 if (mddev->pers->sync_request && mddev->to_remove == NULL)
5348 mddev->to_remove = &md_redundancy_group;
5349 module_put(mddev->pers->owner);
5351 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5353 EXPORT_SYMBOL_GPL(md_stop);
5355 static int md_set_readonly(struct mddev *mddev, int is_open)
5358 mutex_lock(&mddev->open_mutex);
5359 if (atomic_read(&mddev->openers) > is_open) {
5360 printk("md: %s still in use.\n",mdname(mddev));
5365 __md_stop_writes(mddev);
5371 set_disk_ro(mddev->gendisk, 1);
5372 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5373 sysfs_notify_dirent_safe(mddev->sysfs_state);
5377 mutex_unlock(&mddev->open_mutex);
5382 * 0 - completely stop and dis-assemble array
5383 * 2 - stop but do not disassemble array
5385 static int do_md_stop(struct mddev * mddev, int mode, int is_open)
5387 struct gendisk *disk = mddev->gendisk;
5388 struct md_rdev *rdev;
5390 mutex_lock(&mddev->open_mutex);
5391 if (atomic_read(&mddev->openers) > is_open ||
5392 mddev->sysfs_active) {
5393 printk("md: %s still in use.\n",mdname(mddev));
5394 mutex_unlock(&mddev->open_mutex);
5400 set_disk_ro(disk, 0);
5402 __md_stop_writes(mddev);
5404 mddev->queue->merge_bvec_fn = NULL;
5405 mddev->queue->backing_dev_info.congested_fn = NULL;
5407 /* tell userspace to handle 'inactive' */
5408 sysfs_notify_dirent_safe(mddev->sysfs_state);
5410 rdev_for_each(rdev, mddev)
5411 if (rdev->raid_disk >= 0)
5412 sysfs_unlink_rdev(mddev, rdev);
5414 set_capacity(disk, 0);
5415 mutex_unlock(&mddev->open_mutex);
5417 revalidate_disk(disk);
5422 mutex_unlock(&mddev->open_mutex);
5424 * Free resources if final stop
5427 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
5429 bitmap_destroy(mddev);
5430 if (mddev->bitmap_info.file) {
5431 restore_bitmap_write_access(mddev->bitmap_info.file);
5432 fput(mddev->bitmap_info.file);
5433 mddev->bitmap_info.file = NULL;
5435 mddev->bitmap_info.offset = 0;
5437 export_array(mddev);
5440 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
5441 if (mddev->hold_active == UNTIL_STOP)
5442 mddev->hold_active = 0;
5444 blk_integrity_unregister(disk);
5445 md_new_event(mddev);
5446 sysfs_notify_dirent_safe(mddev->sysfs_state);
5451 static void autorun_array(struct mddev *mddev)
5453 struct md_rdev *rdev;
5456 if (list_empty(&mddev->disks))
5459 printk(KERN_INFO "md: running: ");
5461 rdev_for_each(rdev, mddev) {
5462 char b[BDEVNAME_SIZE];
5463 printk("<%s>", bdevname(rdev->bdev,b));
5467 err = do_md_run(mddev);
5469 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
5470 do_md_stop(mddev, 0, 0);
5475 * lets try to run arrays based on all disks that have arrived
5476 * until now. (those are in pending_raid_disks)
5478 * the method: pick the first pending disk, collect all disks with
5479 * the same UUID, remove all from the pending list and put them into
5480 * the 'same_array' list. Then order this list based on superblock
5481 * update time (freshest comes first), kick out 'old' disks and
5482 * compare superblocks. If everything's fine then run it.
5484 * If "unit" is allocated, then bump its reference count
5486 static void autorun_devices(int part)
5488 struct md_rdev *rdev0, *rdev, *tmp;
5489 struct mddev *mddev;
5490 char b[BDEVNAME_SIZE];
5492 printk(KERN_INFO "md: autorun ...\n");
5493 while (!list_empty(&pending_raid_disks)) {
5496 LIST_HEAD(candidates);
5497 rdev0 = list_entry(pending_raid_disks.next,
5498 struct md_rdev, same_set);
5500 printk(KERN_INFO "md: considering %s ...\n",
5501 bdevname(rdev0->bdev,b));
5502 INIT_LIST_HEAD(&candidates);
5503 rdev_for_each_list(rdev, tmp, &pending_raid_disks)
5504 if (super_90_load(rdev, rdev0, 0) >= 0) {
5505 printk(KERN_INFO "md: adding %s ...\n",
5506 bdevname(rdev->bdev,b));
5507 list_move(&rdev->same_set, &candidates);
5510 * now we have a set of devices, with all of them having
5511 * mostly sane superblocks. It's time to allocate the
5515 dev = MKDEV(mdp_major,
5516 rdev0->preferred_minor << MdpMinorShift);
5517 unit = MINOR(dev) >> MdpMinorShift;
5519 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
5522 if (rdev0->preferred_minor != unit) {
5523 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
5524 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
5528 md_probe(dev, NULL, NULL);
5529 mddev = mddev_find(dev);
5530 if (!mddev || !mddev->gendisk) {
5534 "md: cannot allocate memory for md drive.\n");
5537 if (mddev_lock(mddev))
5538 printk(KERN_WARNING "md: %s locked, cannot run\n",
5540 else if (mddev->raid_disks || mddev->major_version
5541 || !list_empty(&mddev->disks)) {
5543 "md: %s already running, cannot run %s\n",
5544 mdname(mddev), bdevname(rdev0->bdev,b));
5545 mddev_unlock(mddev);
5547 printk(KERN_INFO "md: created %s\n", mdname(mddev));
5548 mddev->persistent = 1;
5549 rdev_for_each_list(rdev, tmp, &candidates) {
5550 list_del_init(&rdev->same_set);
5551 if (bind_rdev_to_array(rdev, mddev))
5554 autorun_array(mddev);
5555 mddev_unlock(mddev);
5557 /* on success, candidates will be empty, on error
5560 rdev_for_each_list(rdev, tmp, &candidates) {
5561 list_del_init(&rdev->same_set);
5566 printk(KERN_INFO "md: ... autorun DONE.\n");
5568 #endif /* !MODULE */
5570 static int get_version(void __user * arg)
5574 ver.major = MD_MAJOR_VERSION;
5575 ver.minor = MD_MINOR_VERSION;
5576 ver.patchlevel = MD_PATCHLEVEL_VERSION;
5578 if (copy_to_user(arg, &ver, sizeof(ver)))
5584 static int get_array_info(struct mddev * mddev, void __user * arg)
5586 mdu_array_info_t info;
5587 int nr,working,insync,failed,spare;
5588 struct md_rdev *rdev;
5590 nr=working=insync=failed=spare=0;
5591 rdev_for_each(rdev, mddev) {
5593 if (test_bit(Faulty, &rdev->flags))
5597 if (test_bit(In_sync, &rdev->flags))
5604 info.major_version = mddev->major_version;
5605 info.minor_version = mddev->minor_version;
5606 info.patch_version = MD_PATCHLEVEL_VERSION;
5607 info.ctime = mddev->ctime;
5608 info.level = mddev->level;
5609 info.size = mddev->dev_sectors / 2;
5610 if (info.size != mddev->dev_sectors / 2) /* overflow */
5613 info.raid_disks = mddev->raid_disks;
5614 info.md_minor = mddev->md_minor;
5615 info.not_persistent= !mddev->persistent;
5617 info.utime = mddev->utime;
5620 info.state = (1<<MD_SB_CLEAN);
5621 if (mddev->bitmap && mddev->bitmap_info.offset)
5622 info.state = (1<<MD_SB_BITMAP_PRESENT);
5623 info.active_disks = insync;
5624 info.working_disks = working;
5625 info.failed_disks = failed;
5626 info.spare_disks = spare;
5628 info.layout = mddev->layout;
5629 info.chunk_size = mddev->chunk_sectors << 9;
5631 if (copy_to_user(arg, &info, sizeof(info)))
5637 static int get_bitmap_file(struct mddev * mddev, void __user * arg)
5639 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
5640 char *ptr, *buf = NULL;
5643 if (md_allow_write(mddev))
5644 file = kmalloc(sizeof(*file), GFP_NOIO);
5646 file = kmalloc(sizeof(*file), GFP_KERNEL);
5651 /* bitmap disabled, zero the first byte and copy out */
5652 if (!mddev->bitmap || !mddev->bitmap->file) {
5653 file->pathname[0] = '\0';
5657 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
5661 ptr = d_path(&mddev->bitmap->file->f_path, buf, sizeof(file->pathname));
5665 strcpy(file->pathname, ptr);
5669 if (copy_to_user(arg, file, sizeof(*file)))
5677 static int get_disk_info(struct mddev * mddev, void __user * arg)
5679 mdu_disk_info_t info;
5680 struct md_rdev *rdev;
5682 if (copy_from_user(&info, arg, sizeof(info)))
5685 rdev = find_rdev_nr(mddev, info.number);
5687 info.major = MAJOR(rdev->bdev->bd_dev);
5688 info.minor = MINOR(rdev->bdev->bd_dev);
5689 info.raid_disk = rdev->raid_disk;
5691 if (test_bit(Faulty, &rdev->flags))
5692 info.state |= (1<<MD_DISK_FAULTY);
5693 else if (test_bit(In_sync, &rdev->flags)) {
5694 info.state |= (1<<MD_DISK_ACTIVE);
5695 info.state |= (1<<MD_DISK_SYNC);
5697 if (test_bit(WriteMostly, &rdev->flags))
5698 info.state |= (1<<MD_DISK_WRITEMOSTLY);
5700 info.major = info.minor = 0;
5701 info.raid_disk = -1;
5702 info.state = (1<<MD_DISK_REMOVED);
5705 if (copy_to_user(arg, &info, sizeof(info)))
5711 static int add_new_disk(struct mddev * mddev, mdu_disk_info_t *info)
5713 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
5714 struct md_rdev *rdev;
5715 dev_t dev = MKDEV(info->major,info->minor);
5717 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
5720 if (!mddev->raid_disks) {
5722 /* expecting a device which has a superblock */
5723 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
5726 "md: md_import_device returned %ld\n",
5728 return PTR_ERR(rdev);
5730 if (!list_empty(&mddev->disks)) {
5731 struct md_rdev *rdev0
5732 = list_entry(mddev->disks.next,
5733 struct md_rdev, same_set);
5734 err = super_types[mddev->major_version]
5735 .load_super(rdev, rdev0, mddev->minor_version);
5738 "md: %s has different UUID to %s\n",
5739 bdevname(rdev->bdev,b),
5740 bdevname(rdev0->bdev,b2));
5745 err = bind_rdev_to_array(rdev, mddev);
5752 * add_new_disk can be used once the array is assembled
5753 * to add "hot spares". They must already have a superblock
5758 if (!mddev->pers->hot_add_disk) {
5760 "%s: personality does not support diskops!\n",
5764 if (mddev->persistent)
5765 rdev = md_import_device(dev, mddev->major_version,
5766 mddev->minor_version);
5768 rdev = md_import_device(dev, -1, -1);
5771 "md: md_import_device returned %ld\n",
5773 return PTR_ERR(rdev);
5775 /* set saved_raid_disk if appropriate */
5776 if (!mddev->persistent) {
5777 if (info->state & (1<<MD_DISK_SYNC) &&
5778 info->raid_disk < mddev->raid_disks) {
5779 rdev->raid_disk = info->raid_disk;
5780 set_bit(In_sync, &rdev->flags);
5782 rdev->raid_disk = -1;
5784 super_types[mddev->major_version].
5785 validate_super(mddev, rdev);
5786 if ((info->state & (1<<MD_DISK_SYNC)) &&
5787 (!test_bit(In_sync, &rdev->flags) ||
5788 rdev->raid_disk != info->raid_disk)) {
5789 /* This was a hot-add request, but events doesn't
5790 * match, so reject it.
5796 if (test_bit(In_sync, &rdev->flags))
5797 rdev->saved_raid_disk = rdev->raid_disk;
5799 rdev->saved_raid_disk = -1;
5801 clear_bit(In_sync, &rdev->flags); /* just to be sure */
5802 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
5803 set_bit(WriteMostly, &rdev->flags);
5805 clear_bit(WriteMostly, &rdev->flags);
5807 rdev->raid_disk = -1;
5808 err = bind_rdev_to_array(rdev, mddev);
5809 if (!err && !mddev->pers->hot_remove_disk) {
5810 /* If there is hot_add_disk but no hot_remove_disk
5811 * then added disks for geometry changes,
5812 * and should be added immediately.
5814 super_types[mddev->major_version].
5815 validate_super(mddev, rdev);
5816 err = mddev->pers->hot_add_disk(mddev, rdev);
5818 unbind_rdev_from_array(rdev);
5823 sysfs_notify_dirent_safe(rdev->sysfs_state);
5825 md_update_sb(mddev, 1);
5826 if (mddev->degraded)
5827 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
5828 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5830 md_new_event(mddev);
5831 md_wakeup_thread(mddev->thread);
5835 /* otherwise, add_new_disk is only allowed
5836 * for major_version==0 superblocks
5838 if (mddev->major_version != 0) {
5839 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
5844 if (!(info->state & (1<<MD_DISK_FAULTY))) {
5846 rdev = md_import_device(dev, -1, 0);
5849 "md: error, md_import_device() returned %ld\n",
5851 return PTR_ERR(rdev);
5853 rdev->desc_nr = info->number;
5854 if (info->raid_disk < mddev->raid_disks)
5855 rdev->raid_disk = info->raid_disk;
5857 rdev->raid_disk = -1;
5859 if (rdev->raid_disk < mddev->raid_disks)
5860 if (info->state & (1<<MD_DISK_SYNC))
5861 set_bit(In_sync, &rdev->flags);
5863 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
5864 set_bit(WriteMostly, &rdev->flags);
5866 if (!mddev->persistent) {
5867 printk(KERN_INFO "md: nonpersistent superblock ...\n");
5868 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
5870 rdev->sb_start = calc_dev_sboffset(rdev);
5871 rdev->sectors = rdev->sb_start;
5873 err = bind_rdev_to_array(rdev, mddev);
5883 static int hot_remove_disk(struct mddev * mddev, dev_t dev)
5885 char b[BDEVNAME_SIZE];
5886 struct md_rdev *rdev;
5888 rdev = find_rdev(mddev, dev);
5892 if (rdev->raid_disk >= 0)
5895 kick_rdev_from_array(rdev);
5896 md_update_sb(mddev, 1);
5897 md_new_event(mddev);
5901 printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n",
5902 bdevname(rdev->bdev,b), mdname(mddev));
5906 static int hot_add_disk(struct mddev * mddev, dev_t dev)
5908 char b[BDEVNAME_SIZE];
5910 struct md_rdev *rdev;
5915 if (mddev->major_version != 0) {
5916 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
5917 " version-0 superblocks.\n",
5921 if (!mddev->pers->hot_add_disk) {
5923 "%s: personality does not support diskops!\n",
5928 rdev = md_import_device(dev, -1, 0);
5931 "md: error, md_import_device() returned %ld\n",
5936 if (mddev->persistent)
5937 rdev->sb_start = calc_dev_sboffset(rdev);
5939 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
5941 rdev->sectors = rdev->sb_start;
5943 if (test_bit(Faulty, &rdev->flags)) {
5945 "md: can not hot-add faulty %s disk to %s!\n",
5946 bdevname(rdev->bdev,b), mdname(mddev));
5950 clear_bit(In_sync, &rdev->flags);
5952 rdev->saved_raid_disk = -1;
5953 err = bind_rdev_to_array(rdev, mddev);
5958 * The rest should better be atomic, we can have disk failures
5959 * noticed in interrupt contexts ...
5962 rdev->raid_disk = -1;
5964 md_update_sb(mddev, 1);
5967 * Kick recovery, maybe this spare has to be added to the
5968 * array immediately.
5970 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5971 md_wakeup_thread(mddev->thread);
5972 md_new_event(mddev);
5980 static int set_bitmap_file(struct mddev *mddev, int fd)
5985 if (!mddev->pers->quiesce)
5987 if (mddev->recovery || mddev->sync_thread)
5989 /* we should be able to change the bitmap.. */
5995 return -EEXIST; /* cannot add when bitmap is present */
5996 mddev->bitmap_info.file = fget(fd);
5998 if (mddev->bitmap_info.file == NULL) {
5999 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
6004 err = deny_bitmap_write_access(mddev->bitmap_info.file);
6006 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
6008 fput(mddev->bitmap_info.file);
6009 mddev->bitmap_info.file = NULL;
6012 mddev->bitmap_info.offset = 0; /* file overrides offset */
6013 } else if (mddev->bitmap == NULL)
6014 return -ENOENT; /* cannot remove what isn't there */
6017 mddev->pers->quiesce(mddev, 1);
6019 err = bitmap_create(mddev);
6021 err = bitmap_load(mddev);
6023 if (fd < 0 || err) {
6024 bitmap_destroy(mddev);
6025 fd = -1; /* make sure to put the file */
6027 mddev->pers->quiesce(mddev, 0);
6030 if (mddev->bitmap_info.file) {
6031 restore_bitmap_write_access(mddev->bitmap_info.file);
6032 fput(mddev->bitmap_info.file);
6034 mddev->bitmap_info.file = NULL;
6041 * set_array_info is used two different ways
6042 * The original usage is when creating a new array.
6043 * In this usage, raid_disks is > 0 and it together with
6044 * level, size, not_persistent,layout,chunksize determine the
6045 * shape of the array.
6046 * This will always create an array with a type-0.90.0 superblock.
6047 * The newer usage is when assembling an array.
6048 * In this case raid_disks will be 0, and the major_version field is
6049 * use to determine which style super-blocks are to be found on the devices.
6050 * The minor and patch _version numbers are also kept incase the
6051 * super_block handler wishes to interpret them.
6053 static int set_array_info(struct mddev * mddev, mdu_array_info_t *info)
6056 if (info->raid_disks == 0) {
6057 /* just setting version number for superblock loading */
6058 if (info->major_version < 0 ||
6059 info->major_version >= ARRAY_SIZE(super_types) ||
6060 super_types[info->major_version].name == NULL) {
6061 /* maybe try to auto-load a module? */
6063 "md: superblock version %d not known\n",
6064 info->major_version);
6067 mddev->major_version = info->major_version;
6068 mddev->minor_version = info->minor_version;
6069 mddev->patch_version = info->patch_version;
6070 mddev->persistent = !info->not_persistent;
6071 /* ensure mddev_put doesn't delete this now that there
6072 * is some minimal configuration.
6074 mddev->ctime = get_seconds();
6077 mddev->major_version = MD_MAJOR_VERSION;
6078 mddev->minor_version = MD_MINOR_VERSION;
6079 mddev->patch_version = MD_PATCHLEVEL_VERSION;
6080 mddev->ctime = get_seconds();
6082 mddev->level = info->level;
6083 mddev->clevel[0] = 0;
6084 mddev->dev_sectors = 2 * (sector_t)info->size;
6085 mddev->raid_disks = info->raid_disks;
6086 /* don't set md_minor, it is determined by which /dev/md* was
6089 if (info->state & (1<<MD_SB_CLEAN))
6090 mddev->recovery_cp = MaxSector;
6092 mddev->recovery_cp = 0;
6093 mddev->persistent = ! info->not_persistent;
6094 mddev->external = 0;
6096 mddev->layout = info->layout;
6097 mddev->chunk_sectors = info->chunk_size >> 9;
6099 mddev->max_disks = MD_SB_DISKS;
6101 if (mddev->persistent)
6103 set_bit(MD_CHANGE_DEVS, &mddev->flags);
6105 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
6106 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
6107 mddev->bitmap_info.offset = 0;
6109 mddev->reshape_position = MaxSector;
6112 * Generate a 128 bit UUID
6114 get_random_bytes(mddev->uuid, 16);
6116 mddev->new_level = mddev->level;
6117 mddev->new_chunk_sectors = mddev->chunk_sectors;
6118 mddev->new_layout = mddev->layout;
6119 mddev->delta_disks = 0;
6120 mddev->reshape_backwards = 0;
6125 void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors)
6127 WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__);
6129 if (mddev->external_size)
6132 mddev->array_sectors = array_sectors;
6134 EXPORT_SYMBOL(md_set_array_sectors);
6136 static int update_size(struct mddev *mddev, sector_t num_sectors)
6138 struct md_rdev *rdev;
6140 int fit = (num_sectors == 0);
6142 if (mddev->pers->resize == NULL)
6144 /* The "num_sectors" is the number of sectors of each device that
6145 * is used. This can only make sense for arrays with redundancy.
6146 * linear and raid0 always use whatever space is available. We can only
6147 * consider changing this number if no resync or reconstruction is
6148 * happening, and if the new size is acceptable. It must fit before the
6149 * sb_start or, if that is <data_offset, it must fit before the size
6150 * of each device. If num_sectors is zero, we find the largest size
6153 if (mddev->sync_thread)
6156 /* Sorry, cannot grow a bitmap yet, just remove it,
6160 rdev_for_each(rdev, mddev) {
6161 sector_t avail = rdev->sectors;
6163 if (fit && (num_sectors == 0 || num_sectors > avail))
6164 num_sectors = avail;
6165 if (avail < num_sectors)
6168 rv = mddev->pers->resize(mddev, num_sectors);
6170 revalidate_disk(mddev->gendisk);
6174 static int update_raid_disks(struct mddev *mddev, int raid_disks)
6177 struct md_rdev *rdev;
6178 /* change the number of raid disks */
6179 if (mddev->pers->check_reshape == NULL)
6181 if (raid_disks <= 0 ||
6182 (mddev->max_disks && raid_disks >= mddev->max_disks))
6184 if (mddev->sync_thread || mddev->reshape_position != MaxSector)
6187 rdev_for_each(rdev, mddev) {
6188 if (mddev->raid_disks < raid_disks &&
6189 rdev->data_offset < rdev->new_data_offset)
6191 if (mddev->raid_disks > raid_disks &&
6192 rdev->data_offset > rdev->new_data_offset)
6196 mddev->delta_disks = raid_disks - mddev->raid_disks;
6197 if (mddev->delta_disks < 0)
6198 mddev->reshape_backwards = 1;
6199 else if (mddev->delta_disks > 0)
6200 mddev->reshape_backwards = 0;
6202 rv = mddev->pers->check_reshape(mddev);
6204 mddev->delta_disks = 0;
6205 mddev->reshape_backwards = 0;
6212 * update_array_info is used to change the configuration of an
6214 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
6215 * fields in the info are checked against the array.
6216 * Any differences that cannot be handled will cause an error.
6217 * Normally, only one change can be managed at a time.
6219 static int update_array_info(struct mddev *mddev, mdu_array_info_t *info)
6225 /* calculate expected state,ignoring low bits */
6226 if (mddev->bitmap && mddev->bitmap_info.offset)
6227 state |= (1 << MD_SB_BITMAP_PRESENT);
6229 if (mddev->major_version != info->major_version ||
6230 mddev->minor_version != info->minor_version ||
6231 /* mddev->patch_version != info->patch_version || */
6232 mddev->ctime != info->ctime ||
6233 mddev->level != info->level ||
6234 /* mddev->layout != info->layout || */
6235 !mddev->persistent != info->not_persistent||
6236 mddev->chunk_sectors != info->chunk_size >> 9 ||
6237 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
6238 ((state^info->state) & 0xfffffe00)
6241 /* Check there is only one change */
6242 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
6244 if (mddev->raid_disks != info->raid_disks)
6246 if (mddev->layout != info->layout)
6248 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT))
6255 if (mddev->layout != info->layout) {
6257 * we don't need to do anything at the md level, the
6258 * personality will take care of it all.
6260 if (mddev->pers->check_reshape == NULL)
6263 mddev->new_layout = info->layout;
6264 rv = mddev->pers->check_reshape(mddev);
6266 mddev->new_layout = mddev->layout;
6270 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
6271 rv = update_size(mddev, (sector_t)info->size * 2);
6273 if (mddev->raid_disks != info->raid_disks)
6274 rv = update_raid_disks(mddev, info->raid_disks);
6276 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
6277 if (mddev->pers->quiesce == NULL)
6279 if (mddev->recovery || mddev->sync_thread)
6281 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
6282 /* add the bitmap */
6285 if (mddev->bitmap_info.default_offset == 0)
6287 mddev->bitmap_info.offset =
6288 mddev->bitmap_info.default_offset;
6289 mddev->bitmap_info.space =
6290 mddev->bitmap_info.default_space;
6291 mddev->pers->quiesce(mddev, 1);
6292 rv = bitmap_create(mddev);
6294 rv = bitmap_load(mddev);
6296 bitmap_destroy(mddev);
6297 mddev->pers->quiesce(mddev, 0);
6299 /* remove the bitmap */
6302 if (mddev->bitmap->file)
6304 mddev->pers->quiesce(mddev, 1);
6305 bitmap_destroy(mddev);
6306 mddev->pers->quiesce(mddev, 0);
6307 mddev->bitmap_info.offset = 0;
6310 md_update_sb(mddev, 1);
6314 static int set_disk_faulty(struct mddev *mddev, dev_t dev)
6316 struct md_rdev *rdev;
6318 if (mddev->pers == NULL)
6321 rdev = find_rdev(mddev, dev);
6325 md_error(mddev, rdev);
6326 if (!test_bit(Faulty, &rdev->flags))
6332 * We have a problem here : there is no easy way to give a CHS
6333 * virtual geometry. We currently pretend that we have a 2 heads
6334 * 4 sectors (with a BIG number of cylinders...). This drives
6335 * dosfs just mad... ;-)
6337 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
6339 struct mddev *mddev = bdev->bd_disk->private_data;
6343 geo->cylinders = mddev->array_sectors / 8;
6347 static int md_ioctl(struct block_device *bdev, fmode_t mode,
6348 unsigned int cmd, unsigned long arg)
6351 void __user *argp = (void __user *)arg;
6352 struct mddev *mddev = NULL;
6357 case GET_ARRAY_INFO:
6361 if (!capable(CAP_SYS_ADMIN))
6366 * Commands dealing with the RAID driver but not any
6372 err = get_version(argp);
6375 case PRINT_RAID_DEBUG:
6383 autostart_arrays(arg);
6390 * Commands creating/starting a new array:
6393 mddev = bdev->bd_disk->private_data;
6400 err = mddev_lock(mddev);
6403 "md: ioctl lock interrupted, reason %d, cmd %d\n",
6410 case SET_ARRAY_INFO:
6412 mdu_array_info_t info;
6414 memset(&info, 0, sizeof(info));
6415 else if (copy_from_user(&info, argp, sizeof(info))) {
6420 err = update_array_info(mddev, &info);
6422 printk(KERN_WARNING "md: couldn't update"
6423 " array info. %d\n", err);
6428 if (!list_empty(&mddev->disks)) {
6430 "md: array %s already has disks!\n",
6435 if (mddev->raid_disks) {
6437 "md: array %s already initialised!\n",
6442 err = set_array_info(mddev, &info);
6444 printk(KERN_WARNING "md: couldn't set"
6445 " array info. %d\n", err);
6455 * Commands querying/configuring an existing array:
6457 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
6458 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
6459 if ((!mddev->raid_disks && !mddev->external)
6460 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
6461 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
6462 && cmd != GET_BITMAP_FILE) {
6468 * Commands even a read-only array can execute:
6472 case GET_ARRAY_INFO:
6473 err = get_array_info(mddev, argp);
6476 case GET_BITMAP_FILE:
6477 err = get_bitmap_file(mddev, argp);
6481 err = get_disk_info(mddev, argp);
6484 case RESTART_ARRAY_RW:
6485 err = restart_array(mddev);
6489 err = do_md_stop(mddev, 0, 1);
6493 err = md_set_readonly(mddev, 1);
6497 if (get_user(ro, (int __user *)(arg))) {
6503 /* if the bdev is going readonly the value of mddev->ro
6504 * does not matter, no writes are coming
6509 /* are we are already prepared for writes? */
6513 /* transitioning to readauto need only happen for
6514 * arrays that call md_write_start
6517 err = restart_array(mddev);
6520 set_disk_ro(mddev->gendisk, 0);
6527 * The remaining ioctls are changing the state of the
6528 * superblock, so we do not allow them on read-only arrays.
6529 * However non-MD ioctls (e.g. get-size) will still come through
6530 * here and hit the 'default' below, so only disallow
6531 * 'md' ioctls, and switch to rw mode if started auto-readonly.
6533 if (_IOC_TYPE(cmd) == MD_MAJOR && mddev->ro && mddev->pers) {
6534 if (mddev->ro == 2) {
6536 sysfs_notify_dirent_safe(mddev->sysfs_state);
6537 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6538 md_wakeup_thread(mddev->thread);
6549 mdu_disk_info_t info;
6550 if (copy_from_user(&info, argp, sizeof(info)))
6553 err = add_new_disk(mddev, &info);
6557 case HOT_REMOVE_DISK:
6558 err = hot_remove_disk(mddev, new_decode_dev(arg));
6562 err = hot_add_disk(mddev, new_decode_dev(arg));
6565 case SET_DISK_FAULTY:
6566 err = set_disk_faulty(mddev, new_decode_dev(arg));
6570 err = do_md_run(mddev);
6573 case SET_BITMAP_FILE:
6574 err = set_bitmap_file(mddev, (int)arg);
6584 if (mddev->hold_active == UNTIL_IOCTL &&
6586 mddev->hold_active = 0;
6587 mddev_unlock(mddev);
6596 #ifdef CONFIG_COMPAT
6597 static int md_compat_ioctl(struct block_device *bdev, fmode_t mode,
6598 unsigned int cmd, unsigned long arg)
6601 case HOT_REMOVE_DISK:
6603 case SET_DISK_FAULTY:
6604 case SET_BITMAP_FILE:
6605 /* These take in integer arg, do not convert */
6608 arg = (unsigned long)compat_ptr(arg);
6612 return md_ioctl(bdev, mode, cmd, arg);
6614 #endif /* CONFIG_COMPAT */
6616 static int md_open(struct block_device *bdev, fmode_t mode)
6619 * Succeed if we can lock the mddev, which confirms that
6620 * it isn't being stopped right now.
6622 struct mddev *mddev = mddev_find(bdev->bd_dev);
6625 if (mddev->gendisk != bdev->bd_disk) {
6626 /* we are racing with mddev_put which is discarding this
6630 /* Wait until bdev->bd_disk is definitely gone */
6631 flush_workqueue(md_misc_wq);
6632 /* Then retry the open from the top */
6633 return -ERESTARTSYS;
6635 BUG_ON(mddev != bdev->bd_disk->private_data);
6637 if ((err = mutex_lock_interruptible(&mddev->open_mutex)))
6641 atomic_inc(&mddev->openers);
6642 mutex_unlock(&mddev->open_mutex);
6644 check_disk_change(bdev);
6649 static int md_release(struct gendisk *disk, fmode_t mode)
6651 struct mddev *mddev = disk->private_data;
6654 atomic_dec(&mddev->openers);
6660 static int md_media_changed(struct gendisk *disk)
6662 struct mddev *mddev = disk->private_data;
6664 return mddev->changed;
6667 static int md_revalidate(struct gendisk *disk)
6669 struct mddev *mddev = disk->private_data;
6674 static const struct block_device_operations md_fops =
6676 .owner = THIS_MODULE,
6678 .release = md_release,
6680 #ifdef CONFIG_COMPAT
6681 .compat_ioctl = md_compat_ioctl,
6683 .getgeo = md_getgeo,
6684 .media_changed = md_media_changed,
6685 .revalidate_disk= md_revalidate,
6688 static int md_thread(void * arg)
6690 struct md_thread *thread = arg;
6693 * md_thread is a 'system-thread', it's priority should be very
6694 * high. We avoid resource deadlocks individually in each
6695 * raid personality. (RAID5 does preallocation) We also use RR and
6696 * the very same RT priority as kswapd, thus we will never get
6697 * into a priority inversion deadlock.
6699 * we definitely have to have equal or higher priority than
6700 * bdflush, otherwise bdflush will deadlock if there are too
6701 * many dirty RAID5 blocks.
6704 allow_signal(SIGKILL);
6705 while (!kthread_should_stop()) {
6707 /* We need to wait INTERRUPTIBLE so that
6708 * we don't add to the load-average.
6709 * That means we need to be sure no signals are
6712 if (signal_pending(current))
6713 flush_signals(current);
6715 wait_event_interruptible_timeout
6717 test_bit(THREAD_WAKEUP, &thread->flags)
6718 || kthread_should_stop(),
6721 clear_bit(THREAD_WAKEUP, &thread->flags);
6722 if (!kthread_should_stop())
6723 thread->run(thread->mddev);
6729 void md_wakeup_thread(struct md_thread *thread)
6732 pr_debug("md: waking up MD thread %s.\n", thread->tsk->comm);
6733 set_bit(THREAD_WAKEUP, &thread->flags);
6734 wake_up(&thread->wqueue);
6738 struct md_thread *md_register_thread(void (*run) (struct mddev *), struct mddev *mddev,
6741 struct md_thread *thread;
6743 thread = kzalloc(sizeof(struct md_thread), GFP_KERNEL);
6747 init_waitqueue_head(&thread->wqueue);
6750 thread->mddev = mddev;
6751 thread->timeout = MAX_SCHEDULE_TIMEOUT;
6752 thread->tsk = kthread_run(md_thread, thread,
6754 mdname(thread->mddev),
6755 name ?: mddev->pers->name);
6756 if (IS_ERR(thread->tsk)) {
6763 void md_unregister_thread(struct md_thread **threadp)
6765 struct md_thread *thread = *threadp;
6768 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
6769 /* Locking ensures that mddev_unlock does not wake_up a
6770 * non-existent thread
6772 spin_lock(&pers_lock);
6774 spin_unlock(&pers_lock);
6776 kthread_stop(thread->tsk);
6780 void md_error(struct mddev *mddev, struct md_rdev *rdev)
6787 if (!rdev || test_bit(Faulty, &rdev->flags))
6790 if (!mddev->pers || !mddev->pers->error_handler)
6792 mddev->pers->error_handler(mddev,rdev);
6793 if (mddev->degraded)
6794 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6795 sysfs_notify_dirent_safe(rdev->sysfs_state);
6796 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6797 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6798 md_wakeup_thread(mddev->thread);
6799 if (mddev->event_work.func)
6800 queue_work(md_misc_wq, &mddev->event_work);
6801 md_new_event_inintr(mddev);
6804 /* seq_file implementation /proc/mdstat */
6806 static void status_unused(struct seq_file *seq)
6809 struct md_rdev *rdev;
6811 seq_printf(seq, "unused devices: ");
6813 list_for_each_entry(rdev, &pending_raid_disks, same_set) {
6814 char b[BDEVNAME_SIZE];
6816 seq_printf(seq, "%s ",
6817 bdevname(rdev->bdev,b));
6820 seq_printf(seq, "<none>");
6822 seq_printf(seq, "\n");
6826 static void status_resync(struct seq_file *seq, struct mddev * mddev)
6828 sector_t max_sectors, resync, res;
6829 unsigned long dt, db;
6832 unsigned int per_milli;
6834 resync = mddev->curr_resync - atomic_read(&mddev->recovery_active);
6836 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
6837 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
6838 max_sectors = mddev->resync_max_sectors;
6840 max_sectors = mddev->dev_sectors;
6843 * Should not happen.
6849 /* Pick 'scale' such that (resync>>scale)*1000 will fit
6850 * in a sector_t, and (max_sectors>>scale) will fit in a
6851 * u32, as those are the requirements for sector_div.
6852 * Thus 'scale' must be at least 10
6855 if (sizeof(sector_t) > sizeof(unsigned long)) {
6856 while ( max_sectors/2 > (1ULL<<(scale+32)))
6859 res = (resync>>scale)*1000;
6860 sector_div(res, (u32)((max_sectors>>scale)+1));
6864 int i, x = per_milli/50, y = 20-x;
6865 seq_printf(seq, "[");
6866 for (i = 0; i < x; i++)
6867 seq_printf(seq, "=");
6868 seq_printf(seq, ">");
6869 for (i = 0; i < y; i++)
6870 seq_printf(seq, ".");
6871 seq_printf(seq, "] ");
6873 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
6874 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
6876 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
6878 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
6879 "resync" : "recovery"))),
6880 per_milli/10, per_milli % 10,
6881 (unsigned long long) resync/2,
6882 (unsigned long long) max_sectors/2);
6885 * dt: time from mark until now
6886 * db: blocks written from mark until now
6887 * rt: remaining time
6889 * rt is a sector_t, so could be 32bit or 64bit.
6890 * So we divide before multiply in case it is 32bit and close
6892 * We scale the divisor (db) by 32 to avoid losing precision
6893 * near the end of resync when the number of remaining sectors
6895 * We then divide rt by 32 after multiplying by db to compensate.
6896 * The '+1' avoids division by zero if db is very small.
6898 dt = ((jiffies - mddev->resync_mark) / HZ);
6900 db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active))
6901 - mddev->resync_mark_cnt;
6903 rt = max_sectors - resync; /* number of remaining sectors */
6904 sector_div(rt, db/32+1);
6908 seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60,
6909 ((unsigned long)rt % 60)/6);
6911 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
6914 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
6916 struct list_head *tmp;
6918 struct mddev *mddev;
6926 spin_lock(&all_mddevs_lock);
6927 list_for_each(tmp,&all_mddevs)
6929 mddev = list_entry(tmp, struct mddev, all_mddevs);
6931 spin_unlock(&all_mddevs_lock);
6934 spin_unlock(&all_mddevs_lock);
6936 return (void*)2;/* tail */
6940 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
6942 struct list_head *tmp;
6943 struct mddev *next_mddev, *mddev = v;
6949 spin_lock(&all_mddevs_lock);
6951 tmp = all_mddevs.next;
6953 tmp = mddev->all_mddevs.next;
6954 if (tmp != &all_mddevs)
6955 next_mddev = mddev_get(list_entry(tmp,struct mddev,all_mddevs));
6957 next_mddev = (void*)2;
6960 spin_unlock(&all_mddevs_lock);
6968 static void md_seq_stop(struct seq_file *seq, void *v)
6970 struct mddev *mddev = v;
6972 if (mddev && v != (void*)1 && v != (void*)2)
6976 static int md_seq_show(struct seq_file *seq, void *v)
6978 struct mddev *mddev = v;
6980 struct md_rdev *rdev;
6982 if (v == (void*)1) {
6983 struct md_personality *pers;
6984 seq_printf(seq, "Personalities : ");
6985 spin_lock(&pers_lock);
6986 list_for_each_entry(pers, &pers_list, list)
6987 seq_printf(seq, "[%s] ", pers->name);
6989 spin_unlock(&pers_lock);
6990 seq_printf(seq, "\n");
6991 seq->poll_event = atomic_read(&md_event_count);
6994 if (v == (void*)2) {
6999 if (mddev_lock(mddev) < 0)
7002 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
7003 seq_printf(seq, "%s : %sactive", mdname(mddev),
7004 mddev->pers ? "" : "in");
7007 seq_printf(seq, " (read-only)");
7009 seq_printf(seq, " (auto-read-only)");
7010 seq_printf(seq, " %s", mddev->pers->name);
7014 rdev_for_each(rdev, mddev) {
7015 char b[BDEVNAME_SIZE];
7016 seq_printf(seq, " %s[%d]",
7017 bdevname(rdev->bdev,b), rdev->desc_nr);
7018 if (test_bit(WriteMostly, &rdev->flags))
7019 seq_printf(seq, "(W)");
7020 if (test_bit(Faulty, &rdev->flags)) {
7021 seq_printf(seq, "(F)");
7024 if (rdev->raid_disk < 0)
7025 seq_printf(seq, "(S)"); /* spare */
7026 if (test_bit(Replacement, &rdev->flags))
7027 seq_printf(seq, "(R)");
7028 sectors += rdev->sectors;
7031 if (!list_empty(&mddev->disks)) {
7033 seq_printf(seq, "\n %llu blocks",
7034 (unsigned long long)
7035 mddev->array_sectors / 2);
7037 seq_printf(seq, "\n %llu blocks",
7038 (unsigned long long)sectors / 2);
7040 if (mddev->persistent) {
7041 if (mddev->major_version != 0 ||
7042 mddev->minor_version != 90) {
7043 seq_printf(seq," super %d.%d",
7044 mddev->major_version,
7045 mddev->minor_version);
7047 } else if (mddev->external)
7048 seq_printf(seq, " super external:%s",
7049 mddev->metadata_type);
7051 seq_printf(seq, " super non-persistent");
7054 mddev->pers->status(seq, mddev);
7055 seq_printf(seq, "\n ");
7056 if (mddev->pers->sync_request) {
7057 if (mddev->curr_resync > 2) {
7058 status_resync(seq, mddev);
7059 seq_printf(seq, "\n ");
7060 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
7061 seq_printf(seq, "\tresync=DELAYED\n ");
7062 else if (mddev->recovery_cp < MaxSector)
7063 seq_printf(seq, "\tresync=PENDING\n ");
7066 seq_printf(seq, "\n ");
7068 bitmap_status(seq, mddev->bitmap);
7070 seq_printf(seq, "\n");
7072 mddev_unlock(mddev);
7077 static const struct seq_operations md_seq_ops = {
7078 .start = md_seq_start,
7079 .next = md_seq_next,
7080 .stop = md_seq_stop,
7081 .show = md_seq_show,
7084 static int md_seq_open(struct inode *inode, struct file *file)
7086 struct seq_file *seq;
7089 error = seq_open(file, &md_seq_ops);
7093 seq = file->private_data;
7094 seq->poll_event = atomic_read(&md_event_count);
7098 static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
7100 struct seq_file *seq = filp->private_data;
7103 poll_wait(filp, &md_event_waiters, wait);
7105 /* always allow read */
7106 mask = POLLIN | POLLRDNORM;
7108 if (seq->poll_event != atomic_read(&md_event_count))
7109 mask |= POLLERR | POLLPRI;
7113 static const struct file_operations md_seq_fops = {
7114 .owner = THIS_MODULE,
7115 .open = md_seq_open,
7117 .llseek = seq_lseek,
7118 .release = seq_release_private,
7119 .poll = mdstat_poll,
7122 int register_md_personality(struct md_personality *p)
7124 spin_lock(&pers_lock);
7125 list_add_tail(&p->list, &pers_list);
7126 printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level);
7127 spin_unlock(&pers_lock);
7131 int unregister_md_personality(struct md_personality *p)
7133 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
7134 spin_lock(&pers_lock);
7135 list_del_init(&p->list);
7136 spin_unlock(&pers_lock);
7140 static int is_mddev_idle(struct mddev *mddev, int init)
7142 struct md_rdev * rdev;
7148 rdev_for_each_rcu(rdev, mddev) {
7149 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
7150 curr_events = (int)part_stat_read(&disk->part0, sectors[0]) +
7151 (int)part_stat_read(&disk->part0, sectors[1]) -
7152 atomic_read(&disk->sync_io);
7153 /* sync IO will cause sync_io to increase before the disk_stats
7154 * as sync_io is counted when a request starts, and
7155 * disk_stats is counted when it completes.
7156 * So resync activity will cause curr_events to be smaller than
7157 * when there was no such activity.
7158 * non-sync IO will cause disk_stat to increase without
7159 * increasing sync_io so curr_events will (eventually)
7160 * be larger than it was before. Once it becomes
7161 * substantially larger, the test below will cause
7162 * the array to appear non-idle, and resync will slow
7164 * If there is a lot of outstanding resync activity when
7165 * we set last_event to curr_events, then all that activity
7166 * completing might cause the array to appear non-idle
7167 * and resync will be slowed down even though there might
7168 * not have been non-resync activity. This will only
7169 * happen once though. 'last_events' will soon reflect
7170 * the state where there is little or no outstanding
7171 * resync requests, and further resync activity will
7172 * always make curr_events less than last_events.
7175 if (init || curr_events - rdev->last_events > 64) {
7176 rdev->last_events = curr_events;
7184 void md_done_sync(struct mddev *mddev, int blocks, int ok)
7186 /* another "blocks" (512byte) blocks have been synced */
7187 atomic_sub(blocks, &mddev->recovery_active);
7188 wake_up(&mddev->recovery_wait);
7190 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7191 md_wakeup_thread(mddev->thread);
7192 // stop recovery, signal do_sync ....
7197 /* md_write_start(mddev, bi)
7198 * If we need to update some array metadata (e.g. 'active' flag
7199 * in superblock) before writing, schedule a superblock update
7200 * and wait for it to complete.
7202 void md_write_start(struct mddev *mddev, struct bio *bi)
7205 if (bio_data_dir(bi) != WRITE)
7208 BUG_ON(mddev->ro == 1);
7209 if (mddev->ro == 2) {
7210 /* need to switch to read/write */
7212 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7213 md_wakeup_thread(mddev->thread);
7214 md_wakeup_thread(mddev->sync_thread);
7217 atomic_inc(&mddev->writes_pending);
7218 if (mddev->safemode == 1)
7219 mddev->safemode = 0;
7220 if (mddev->in_sync) {
7221 spin_lock_irq(&mddev->write_lock);
7222 if (mddev->in_sync) {
7224 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
7225 set_bit(MD_CHANGE_PENDING, &mddev->flags);
7226 md_wakeup_thread(mddev->thread);
7229 spin_unlock_irq(&mddev->write_lock);
7232 sysfs_notify_dirent_safe(mddev->sysfs_state);
7233 wait_event(mddev->sb_wait,
7234 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
7237 void md_write_end(struct mddev *mddev)
7239 if (atomic_dec_and_test(&mddev->writes_pending)) {
7240 if (mddev->safemode == 2)
7241 md_wakeup_thread(mddev->thread);
7242 else if (mddev->safemode_delay)
7243 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
7247 /* md_allow_write(mddev)
7248 * Calling this ensures that the array is marked 'active' so that writes
7249 * may proceed without blocking. It is important to call this before
7250 * attempting a GFP_KERNEL allocation while holding the mddev lock.
7251 * Must be called with mddev_lock held.
7253 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
7254 * is dropped, so return -EAGAIN after notifying userspace.
7256 int md_allow_write(struct mddev *mddev)
7262 if (!mddev->pers->sync_request)
7265 spin_lock_irq(&mddev->write_lock);
7266 if (mddev->in_sync) {
7268 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
7269 set_bit(MD_CHANGE_PENDING, &mddev->flags);
7270 if (mddev->safemode_delay &&
7271 mddev->safemode == 0)
7272 mddev->safemode = 1;
7273 spin_unlock_irq(&mddev->write_lock);
7274 md_update_sb(mddev, 0);
7275 sysfs_notify_dirent_safe(mddev->sysfs_state);
7277 spin_unlock_irq(&mddev->write_lock);
7279 if (test_bit(MD_CHANGE_PENDING, &mddev->flags))
7284 EXPORT_SYMBOL_GPL(md_allow_write);
7286 #define SYNC_MARKS 10
7287 #define SYNC_MARK_STEP (3*HZ)
7288 void md_do_sync(struct mddev *mddev)
7290 struct mddev *mddev2;
7291 unsigned int currspeed = 0,
7293 sector_t max_sectors,j, io_sectors;
7294 unsigned long mark[SYNC_MARKS];
7295 sector_t mark_cnt[SYNC_MARKS];
7297 struct list_head *tmp;
7298 sector_t last_check;
7300 struct md_rdev *rdev;
7303 /* just incase thread restarts... */
7304 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
7306 if (mddev->ro) /* never try to sync a read-only array */
7309 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
7310 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
7311 desc = "data-check";
7312 else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
7313 desc = "requested-resync";
7316 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
7321 /* we overload curr_resync somewhat here.
7322 * 0 == not engaged in resync at all
7323 * 2 == checking that there is no conflict with another sync
7324 * 1 == like 2, but have yielded to allow conflicting resync to
7326 * other == active in resync - this many blocks
7328 * Before starting a resync we must have set curr_resync to
7329 * 2, and then checked that every "conflicting" array has curr_resync
7330 * less than ours. When we find one that is the same or higher
7331 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
7332 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
7333 * This will mean we have to start checking from the beginning again.
7338 mddev->curr_resync = 2;
7341 if (kthread_should_stop())
7342 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7344 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
7346 for_each_mddev(mddev2, tmp) {
7347 if (mddev2 == mddev)
7349 if (!mddev->parallel_resync
7350 && mddev2->curr_resync
7351 && match_mddev_units(mddev, mddev2)) {
7353 if (mddev < mddev2 && mddev->curr_resync == 2) {
7354 /* arbitrarily yield */
7355 mddev->curr_resync = 1;
7356 wake_up(&resync_wait);
7358 if (mddev > mddev2 && mddev->curr_resync == 1)
7359 /* no need to wait here, we can wait the next
7360 * time 'round when curr_resync == 2
7363 /* We need to wait 'interruptible' so as not to
7364 * contribute to the load average, and not to
7365 * be caught by 'softlockup'
7367 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
7368 if (!kthread_should_stop() &&
7369 mddev2->curr_resync >= mddev->curr_resync) {
7370 printk(KERN_INFO "md: delaying %s of %s"
7371 " until %s has finished (they"
7372 " share one or more physical units)\n",
7373 desc, mdname(mddev), mdname(mddev2));
7375 if (signal_pending(current))
7376 flush_signals(current);
7378 finish_wait(&resync_wait, &wq);
7381 finish_wait(&resync_wait, &wq);
7384 } while (mddev->curr_resync < 2);
7387 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
7388 /* resync follows the size requested by the personality,
7389 * which defaults to physical size, but can be virtual size
7391 max_sectors = mddev->resync_max_sectors;
7392 mddev->resync_mismatches = 0;
7393 /* we don't use the checkpoint if there's a bitmap */
7394 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
7395 j = mddev->resync_min;
7396 else if (!mddev->bitmap)
7397 j = mddev->recovery_cp;
7399 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
7400 max_sectors = mddev->resync_max_sectors;
7402 /* recovery follows the physical size of devices */
7403 max_sectors = mddev->dev_sectors;
7406 rdev_for_each_rcu(rdev, mddev)
7407 if (rdev->raid_disk >= 0 &&
7408 !test_bit(Faulty, &rdev->flags) &&
7409 !test_bit(In_sync, &rdev->flags) &&
7410 rdev->recovery_offset < j)
7411 j = rdev->recovery_offset;
7415 printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev));
7416 printk(KERN_INFO "md: minimum _guaranteed_ speed:"
7417 " %d KB/sec/disk.\n", speed_min(mddev));
7418 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
7419 "(but not more than %d KB/sec) for %s.\n",
7420 speed_max(mddev), desc);
7422 is_mddev_idle(mddev, 1); /* this initializes IO event counters */
7425 for (m = 0; m < SYNC_MARKS; m++) {
7427 mark_cnt[m] = io_sectors;
7430 mddev->resync_mark = mark[last_mark];
7431 mddev->resync_mark_cnt = mark_cnt[last_mark];
7434 * Tune reconstruction:
7436 window = 32*(PAGE_SIZE/512);
7437 printk(KERN_INFO "md: using %dk window, over a total of %lluk.\n",
7438 window/2, (unsigned long long)max_sectors/2);
7440 atomic_set(&mddev->recovery_active, 0);
7445 "md: resuming %s of %s from checkpoint.\n",
7446 desc, mdname(mddev));
7447 mddev->curr_resync = j;
7449 mddev->curr_resync_completed = j;
7451 while (j < max_sectors) {
7456 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
7457 ((mddev->curr_resync > mddev->curr_resync_completed &&
7458 (mddev->curr_resync - mddev->curr_resync_completed)
7459 > (max_sectors >> 4)) ||
7460 (j - mddev->curr_resync_completed)*2
7461 >= mddev->resync_max - mddev->curr_resync_completed
7463 /* time to update curr_resync_completed */
7464 wait_event(mddev->recovery_wait,
7465 atomic_read(&mddev->recovery_active) == 0);
7466 mddev->curr_resync_completed = j;
7467 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
7468 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
7471 while (j >= mddev->resync_max && !kthread_should_stop()) {
7472 /* As this condition is controlled by user-space,
7473 * we can block indefinitely, so use '_interruptible'
7474 * to avoid triggering warnings.
7476 flush_signals(current); /* just in case */
7477 wait_event_interruptible(mddev->recovery_wait,
7478 mddev->resync_max > j
7479 || kthread_should_stop());
7482 if (kthread_should_stop())
7485 sectors = mddev->pers->sync_request(mddev, j, &skipped,
7486 currspeed < speed_min(mddev));
7488 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7492 if (!skipped) { /* actual IO requested */
7493 io_sectors += sectors;
7494 atomic_add(sectors, &mddev->recovery_active);
7497 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
7501 if (j>1) mddev->curr_resync = j;
7502 mddev->curr_mark_cnt = io_sectors;
7503 if (last_check == 0)
7504 /* this is the earliest that rebuild will be
7505 * visible in /proc/mdstat
7507 md_new_event(mddev);
7509 if (last_check + window > io_sectors || j == max_sectors)
7512 last_check = io_sectors;
7514 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
7516 int next = (last_mark+1) % SYNC_MARKS;
7518 mddev->resync_mark = mark[next];
7519 mddev->resync_mark_cnt = mark_cnt[next];
7520 mark[next] = jiffies;
7521 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
7526 if (kthread_should_stop())
7531 * this loop exits only if either when we are slower than
7532 * the 'hard' speed limit, or the system was IO-idle for
7534 * the system might be non-idle CPU-wise, but we only care
7535 * about not overloading the IO subsystem. (things like an
7536 * e2fsck being done on the RAID array should execute fast)
7540 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
7541 /((jiffies-mddev->resync_mark)/HZ +1) +1;
7543 if (currspeed > speed_min(mddev)) {
7544 if ((currspeed > speed_max(mddev)) ||
7545 !is_mddev_idle(mddev, 0)) {
7551 printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc);
7553 * this also signals 'finished resyncing' to md_stop
7556 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
7558 /* tell personality that we are finished */
7559 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
7561 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
7562 mddev->curr_resync > 2) {
7563 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
7564 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
7565 if (mddev->curr_resync >= mddev->recovery_cp) {
7567 "md: checkpointing %s of %s.\n",
7568 desc, mdname(mddev));
7569 mddev->recovery_cp =
7570 mddev->curr_resync_completed;
7573 mddev->recovery_cp = MaxSector;
7575 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
7576 mddev->curr_resync = MaxSector;
7578 rdev_for_each_rcu(rdev, mddev)
7579 if (rdev->raid_disk >= 0 &&
7580 mddev->delta_disks >= 0 &&
7581 !test_bit(Faulty, &rdev->flags) &&
7582 !test_bit(In_sync, &rdev->flags) &&
7583 rdev->recovery_offset < mddev->curr_resync)
7584 rdev->recovery_offset = mddev->curr_resync;
7589 set_bit(MD_CHANGE_DEVS, &mddev->flags);
7591 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
7592 /* We completed so min/max setting can be forgotten if used. */
7593 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
7594 mddev->resync_min = 0;
7595 mddev->resync_max = MaxSector;
7596 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
7597 mddev->resync_min = mddev->curr_resync_completed;
7598 mddev->curr_resync = 0;
7599 wake_up(&resync_wait);
7600 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
7601 md_wakeup_thread(mddev->thread);
7606 * got a signal, exit.
7609 "md: md_do_sync() got signal ... exiting\n");
7610 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7614 EXPORT_SYMBOL_GPL(md_do_sync);
7616 static int remove_and_add_spares(struct mddev *mddev)
7618 struct md_rdev *rdev;
7622 mddev->curr_resync_completed = 0;
7624 rdev_for_each(rdev, mddev)
7625 if (rdev->raid_disk >= 0 &&
7626 !test_bit(Blocked, &rdev->flags) &&
7627 (test_bit(Faulty, &rdev->flags) ||
7628 ! test_bit(In_sync, &rdev->flags)) &&
7629 atomic_read(&rdev->nr_pending)==0) {
7630 if (mddev->pers->hot_remove_disk(
7631 mddev, rdev) == 0) {
7632 sysfs_unlink_rdev(mddev, rdev);
7633 rdev->raid_disk = -1;
7638 sysfs_notify(&mddev->kobj, NULL,
7642 rdev_for_each(rdev, mddev) {
7643 if (rdev->raid_disk >= 0 &&
7644 !test_bit(In_sync, &rdev->flags) &&
7645 !test_bit(Faulty, &rdev->flags))
7647 if (rdev->raid_disk < 0
7648 && !test_bit(Faulty, &rdev->flags)) {
7649 rdev->recovery_offset = 0;
7651 hot_add_disk(mddev, rdev) == 0) {
7652 if (sysfs_link_rdev(mddev, rdev))
7653 /* failure here is OK */;
7655 md_new_event(mddev);
7656 set_bit(MD_CHANGE_DEVS, &mddev->flags);
7663 static void reap_sync_thread(struct mddev *mddev)
7665 struct md_rdev *rdev;
7667 /* resync has finished, collect result */
7668 md_unregister_thread(&mddev->sync_thread);
7669 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
7670 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
7672 /* activate any spares */
7673 if (mddev->pers->spare_active(mddev))
7674 sysfs_notify(&mddev->kobj, NULL,
7677 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
7678 mddev->pers->finish_reshape)
7679 mddev->pers->finish_reshape(mddev);
7681 /* If array is no-longer degraded, then any saved_raid_disk
7682 * information must be scrapped. Also if any device is now
7683 * In_sync we must scrape the saved_raid_disk for that device
7684 * do the superblock for an incrementally recovered device
7687 rdev_for_each(rdev, mddev)
7688 if (!mddev->degraded ||
7689 test_bit(In_sync, &rdev->flags))
7690 rdev->saved_raid_disk = -1;
7692 md_update_sb(mddev, 1);
7693 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7694 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7695 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
7696 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
7697 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
7698 /* flag recovery needed just to double check */
7699 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7700 sysfs_notify_dirent_safe(mddev->sysfs_action);
7701 md_new_event(mddev);
7702 if (mddev->event_work.func)
7703 queue_work(md_misc_wq, &mddev->event_work);
7707 * This routine is regularly called by all per-raid-array threads to
7708 * deal with generic issues like resync and super-block update.
7709 * Raid personalities that don't have a thread (linear/raid0) do not
7710 * need this as they never do any recovery or update the superblock.
7712 * It does not do any resync itself, but rather "forks" off other threads
7713 * to do that as needed.
7714 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
7715 * "->recovery" and create a thread at ->sync_thread.
7716 * When the thread finishes it sets MD_RECOVERY_DONE
7717 * and wakeups up this thread which will reap the thread and finish up.
7718 * This thread also removes any faulty devices (with nr_pending == 0).
7720 * The overall approach is:
7721 * 1/ if the superblock needs updating, update it.
7722 * 2/ If a recovery thread is running, don't do anything else.
7723 * 3/ If recovery has finished, clean up, possibly marking spares active.
7724 * 4/ If there are any faulty devices, remove them.
7725 * 5/ If array is degraded, try to add spares devices
7726 * 6/ If array has spares or is not in-sync, start a resync thread.
7728 void md_check_recovery(struct mddev *mddev)
7730 if (mddev->suspended)
7734 bitmap_daemon_work(mddev);
7736 if (signal_pending(current)) {
7737 if (mddev->pers->sync_request && !mddev->external) {
7738 printk(KERN_INFO "md: %s in immediate safe mode\n",
7740 mddev->safemode = 2;
7742 flush_signals(current);
7745 if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
7748 (mddev->flags & ~ (1<<MD_CHANGE_PENDING)) ||
7749 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
7750 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
7751 (mddev->external == 0 && mddev->safemode == 1) ||
7752 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
7753 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
7757 if (mddev_trylock(mddev)) {
7761 /* Only thing we do on a ro array is remove
7764 struct md_rdev *rdev;
7765 rdev_for_each(rdev, mddev)
7766 if (rdev->raid_disk >= 0 &&
7767 !test_bit(Blocked, &rdev->flags) &&
7768 test_bit(Faulty, &rdev->flags) &&
7769 atomic_read(&rdev->nr_pending)==0) {
7770 if (mddev->pers->hot_remove_disk(
7771 mddev, rdev) == 0) {
7772 sysfs_unlink_rdev(mddev, rdev);
7773 rdev->raid_disk = -1;
7776 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7780 if (!mddev->external) {
7782 spin_lock_irq(&mddev->write_lock);
7783 if (mddev->safemode &&
7784 !atomic_read(&mddev->writes_pending) &&
7786 mddev->recovery_cp == MaxSector) {
7789 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
7791 if (mddev->safemode == 1)
7792 mddev->safemode = 0;
7793 spin_unlock_irq(&mddev->write_lock);
7795 sysfs_notify_dirent_safe(mddev->sysfs_state);
7799 md_update_sb(mddev, 0);
7801 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
7802 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
7803 /* resync/recovery still happening */
7804 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7807 if (mddev->sync_thread) {
7808 reap_sync_thread(mddev);
7811 /* Set RUNNING before clearing NEEDED to avoid
7812 * any transients in the value of "sync_action".
7814 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7815 /* Clear some bits that don't mean anything, but
7818 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
7819 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
7821 if (!test_and_clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
7822 test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
7824 /* no recovery is running.
7825 * remove any failed drives, then
7826 * add spares if possible.
7827 * Spare are also removed and re-added, to allow
7828 * the personality to fail the re-add.
7831 if (mddev->reshape_position != MaxSector) {
7832 if (mddev->pers->check_reshape == NULL ||
7833 mddev->pers->check_reshape(mddev) != 0)
7834 /* Cannot proceed */
7836 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
7837 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7838 } else if ((spares = remove_and_add_spares(mddev))) {
7839 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7840 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
7841 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
7842 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7843 } else if (mddev->recovery_cp < MaxSector) {
7844 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7845 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7846 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
7847 /* nothing to be done ... */
7850 if (mddev->pers->sync_request) {
7852 /* We are adding a device or devices to an array
7853 * which has the bitmap stored on all devices.
7854 * So make sure all bitmap pages get written
7856 bitmap_write_all(mddev->bitmap);
7858 mddev->sync_thread = md_register_thread(md_do_sync,
7861 if (!mddev->sync_thread) {
7862 printk(KERN_ERR "%s: could not start resync"
7865 /* leave the spares where they are, it shouldn't hurt */
7866 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7867 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7868 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
7869 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
7870 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
7872 md_wakeup_thread(mddev->sync_thread);
7873 sysfs_notify_dirent_safe(mddev->sysfs_action);
7874 md_new_event(mddev);
7877 if (!mddev->sync_thread) {
7878 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7879 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
7881 if (mddev->sysfs_action)
7882 sysfs_notify_dirent_safe(mddev->sysfs_action);
7884 mddev_unlock(mddev);
7888 void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev)
7890 sysfs_notify_dirent_safe(rdev->sysfs_state);
7891 wait_event_timeout(rdev->blocked_wait,
7892 !test_bit(Blocked, &rdev->flags) &&
7893 !test_bit(BlockedBadBlocks, &rdev->flags),
7894 msecs_to_jiffies(5000));
7895 rdev_dec_pending(rdev, mddev);
7897 EXPORT_SYMBOL(md_wait_for_blocked_rdev);
7899 void md_finish_reshape(struct mddev *mddev)
7901 /* called be personality module when reshape completes. */
7902 struct md_rdev *rdev;
7904 rdev_for_each(rdev, mddev) {
7905 if (rdev->data_offset > rdev->new_data_offset)
7906 rdev->sectors += rdev->data_offset - rdev->new_data_offset;
7908 rdev->sectors -= rdev->new_data_offset - rdev->data_offset;
7909 rdev->data_offset = rdev->new_data_offset;
7912 EXPORT_SYMBOL(md_finish_reshape);
7914 /* Bad block management.
7915 * We can record which blocks on each device are 'bad' and so just
7916 * fail those blocks, or that stripe, rather than the whole device.
7917 * Entries in the bad-block table are 64bits wide. This comprises:
7918 * Length of bad-range, in sectors: 0-511 for lengths 1-512
7919 * Start of bad-range, sector offset, 54 bits (allows 8 exbibytes)
7920 * A 'shift' can be set so that larger blocks are tracked and
7921 * consequently larger devices can be covered.
7922 * 'Acknowledged' flag - 1 bit. - the most significant bit.
7924 * Locking of the bad-block table uses a seqlock so md_is_badblock
7925 * might need to retry if it is very unlucky.
7926 * We will sometimes want to check for bad blocks in a bi_end_io function,
7927 * so we use the write_seqlock_irq variant.
7929 * When looking for a bad block we specify a range and want to
7930 * know if any block in the range is bad. So we binary-search
7931 * to the last range that starts at-or-before the given endpoint,
7932 * (or "before the sector after the target range")
7933 * then see if it ends after the given start.
7935 * 0 if there are no known bad blocks in the range
7936 * 1 if there are known bad block which are all acknowledged
7937 * -1 if there are bad blocks which have not yet been acknowledged in metadata.
7938 * plus the start/length of the first bad section we overlap.
7940 int md_is_badblock(struct badblocks *bb, sector_t s, int sectors,
7941 sector_t *first_bad, int *bad_sectors)
7947 sector_t target = s + sectors;
7950 if (bb->shift > 0) {
7951 /* round the start down, and the end up */
7953 target += (1<<bb->shift) - 1;
7954 target >>= bb->shift;
7955 sectors = target - s;
7957 /* 'target' is now the first block after the bad range */
7960 seq = read_seqbegin(&bb->lock);
7964 /* Binary search between lo and hi for 'target'
7965 * i.e. for the last range that starts before 'target'
7967 /* INVARIANT: ranges before 'lo' and at-or-after 'hi'
7968 * are known not to be the last range before target.
7969 * VARIANT: hi-lo is the number of possible
7970 * ranges, and decreases until it reaches 1
7972 while (hi - lo > 1) {
7973 int mid = (lo + hi) / 2;
7974 sector_t a = BB_OFFSET(p[mid]);
7976 /* This could still be the one, earlier ranges
7980 /* This and later ranges are definitely out. */
7983 /* 'lo' might be the last that started before target, but 'hi' isn't */
7985 /* need to check all range that end after 's' to see if
7986 * any are unacknowledged.
7989 BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) {
7990 if (BB_OFFSET(p[lo]) < target) {
7991 /* starts before the end, and finishes after
7992 * the start, so they must overlap
7994 if (rv != -1 && BB_ACK(p[lo]))
7998 *first_bad = BB_OFFSET(p[lo]);
7999 *bad_sectors = BB_LEN(p[lo]);
8005 if (read_seqretry(&bb->lock, seq))
8010 EXPORT_SYMBOL_GPL(md_is_badblock);
8013 * Add a range of bad blocks to the table.
8014 * This might extend the table, or might contract it
8015 * if two adjacent ranges can be merged.
8016 * We binary-search to find the 'insertion' point, then
8017 * decide how best to handle it.
8019 static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors,
8027 /* badblocks are disabled */
8031 /* round the start down, and the end up */
8032 sector_t next = s + sectors;
8034 next += (1<<bb->shift) - 1;
8039 write_seqlock_irq(&bb->lock);
8044 /* Find the last range that starts at-or-before 's' */
8045 while (hi - lo > 1) {
8046 int mid = (lo + hi) / 2;
8047 sector_t a = BB_OFFSET(p[mid]);
8053 if (hi > lo && BB_OFFSET(p[lo]) > s)
8057 /* we found a range that might merge with the start
8060 sector_t a = BB_OFFSET(p[lo]);
8061 sector_t e = a + BB_LEN(p[lo]);
8062 int ack = BB_ACK(p[lo]);
8064 /* Yes, we can merge with a previous range */
8065 if (s == a && s + sectors >= e)
8066 /* new range covers old */
8069 ack = ack && acknowledged;
8071 if (e < s + sectors)
8073 if (e - a <= BB_MAX_LEN) {
8074 p[lo] = BB_MAKE(a, e-a, ack);
8077 /* does not all fit in one range,
8078 * make p[lo] maximal
8080 if (BB_LEN(p[lo]) != BB_MAX_LEN)
8081 p[lo] = BB_MAKE(a, BB_MAX_LEN, ack);
8087 if (sectors && hi < bb->count) {
8088 /* 'hi' points to the first range that starts after 's'.
8089 * Maybe we can merge with the start of that range */
8090 sector_t a = BB_OFFSET(p[hi]);
8091 sector_t e = a + BB_LEN(p[hi]);
8092 int ack = BB_ACK(p[hi]);
8093 if (a <= s + sectors) {
8094 /* merging is possible */
8095 if (e <= s + sectors) {
8100 ack = ack && acknowledged;
8103 if (e - a <= BB_MAX_LEN) {
8104 p[hi] = BB_MAKE(a, e-a, ack);
8107 p[hi] = BB_MAKE(a, BB_MAX_LEN, ack);
8115 if (sectors == 0 && hi < bb->count) {
8116 /* we might be able to combine lo and hi */
8117 /* Note: 's' is at the end of 'lo' */
8118 sector_t a = BB_OFFSET(p[hi]);
8119 int lolen = BB_LEN(p[lo]);
8120 int hilen = BB_LEN(p[hi]);
8121 int newlen = lolen + hilen - (s - a);
8122 if (s >= a && newlen < BB_MAX_LEN) {
8123 /* yes, we can combine them */
8124 int ack = BB_ACK(p[lo]) && BB_ACK(p[hi]);
8125 p[lo] = BB_MAKE(BB_OFFSET(p[lo]), newlen, ack);
8126 memmove(p + hi, p + hi + 1,
8127 (bb->count - hi - 1) * 8);
8132 /* didn't merge (it all).
8133 * Need to add a range just before 'hi' */
8134 if (bb->count >= MD_MAX_BADBLOCKS) {
8135 /* No room for more */
8139 int this_sectors = sectors;
8140 memmove(p + hi + 1, p + hi,
8141 (bb->count - hi) * 8);
8144 if (this_sectors > BB_MAX_LEN)
8145 this_sectors = BB_MAX_LEN;
8146 p[hi] = BB_MAKE(s, this_sectors, acknowledged);
8147 sectors -= this_sectors;
8154 bb->unacked_exist = 1;
8155 write_sequnlock_irq(&bb->lock);
8160 int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
8165 s += rdev->new_data_offset;
8167 s += rdev->data_offset;
8168 rv = md_set_badblocks(&rdev->badblocks,
8171 /* Make sure they get written out promptly */
8172 sysfs_notify_dirent_safe(rdev->sysfs_state);
8173 set_bit(MD_CHANGE_CLEAN, &rdev->mddev->flags);
8174 md_wakeup_thread(rdev->mddev->thread);
8178 EXPORT_SYMBOL_GPL(rdev_set_badblocks);
8181 * Remove a range of bad blocks from the table.
8182 * This may involve extending the table if we spilt a region,
8183 * but it must not fail. So if the table becomes full, we just
8184 * drop the remove request.
8186 static int md_clear_badblocks(struct badblocks *bb, sector_t s, int sectors)
8190 sector_t target = s + sectors;
8193 if (bb->shift > 0) {
8194 /* When clearing we round the start up and the end down.
8195 * This should not matter as the shift should align with
8196 * the block size and no rounding should ever be needed.
8197 * However it is better the think a block is bad when it
8198 * isn't than to think a block is not bad when it is.
8200 s += (1<<bb->shift) - 1;
8202 target >>= bb->shift;
8203 sectors = target - s;
8206 write_seqlock_irq(&bb->lock);
8211 /* Find the last range that starts before 'target' */
8212 while (hi - lo > 1) {
8213 int mid = (lo + hi) / 2;
8214 sector_t a = BB_OFFSET(p[mid]);
8221 /* p[lo] is the last range that could overlap the
8222 * current range. Earlier ranges could also overlap,
8223 * but only this one can overlap the end of the range.
8225 if (BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > target) {
8226 /* Partial overlap, leave the tail of this range */
8227 int ack = BB_ACK(p[lo]);
8228 sector_t a = BB_OFFSET(p[lo]);
8229 sector_t end = a + BB_LEN(p[lo]);
8232 /* we need to split this range */
8233 if (bb->count >= MD_MAX_BADBLOCKS) {
8237 memmove(p+lo+1, p+lo, (bb->count - lo) * 8);
8239 p[lo] = BB_MAKE(a, s-a, ack);
8242 p[lo] = BB_MAKE(target, end - target, ack);
8243 /* there is no longer an overlap */
8248 BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) {
8249 /* This range does overlap */
8250 if (BB_OFFSET(p[lo]) < s) {
8251 /* Keep the early parts of this range. */
8252 int ack = BB_ACK(p[lo]);
8253 sector_t start = BB_OFFSET(p[lo]);
8254 p[lo] = BB_MAKE(start, s - start, ack);
8255 /* now low doesn't overlap, so.. */
8260 /* 'lo' is strictly before, 'hi' is strictly after,
8261 * anything between needs to be discarded
8264 memmove(p+lo+1, p+hi, (bb->count - hi) * 8);
8265 bb->count -= (hi - lo - 1);
8271 write_sequnlock_irq(&bb->lock);
8275 int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
8279 s += rdev->new_data_offset;
8281 s += rdev->data_offset;
8282 return md_clear_badblocks(&rdev->badblocks,
8285 EXPORT_SYMBOL_GPL(rdev_clear_badblocks);
8288 * Acknowledge all bad blocks in a list.
8289 * This only succeeds if ->changed is clear. It is used by
8290 * in-kernel metadata updates
8292 void md_ack_all_badblocks(struct badblocks *bb)
8294 if (bb->page == NULL || bb->changed)
8295 /* no point even trying */
8297 write_seqlock_irq(&bb->lock);
8299 if (bb->changed == 0 && bb->unacked_exist) {
8302 for (i = 0; i < bb->count ; i++) {
8303 if (!BB_ACK(p[i])) {
8304 sector_t start = BB_OFFSET(p[i]);
8305 int len = BB_LEN(p[i]);
8306 p[i] = BB_MAKE(start, len, 1);
8309 bb->unacked_exist = 0;
8311 write_sequnlock_irq(&bb->lock);
8313 EXPORT_SYMBOL_GPL(md_ack_all_badblocks);
8315 /* sysfs access to bad-blocks list.
8316 * We present two files.
8317 * 'bad-blocks' lists sector numbers and lengths of ranges that
8318 * are recorded as bad. The list is truncated to fit within
8319 * the one-page limit of sysfs.
8320 * Writing "sector length" to this file adds an acknowledged
8322 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
8323 * been acknowledged. Writing to this file adds bad blocks
8324 * without acknowledging them. This is largely for testing.
8328 badblocks_show(struct badblocks *bb, char *page, int unack)
8339 seq = read_seqbegin(&bb->lock);
8344 while (len < PAGE_SIZE && i < bb->count) {
8345 sector_t s = BB_OFFSET(p[i]);
8346 unsigned int length = BB_LEN(p[i]);
8347 int ack = BB_ACK(p[i]);
8353 len += snprintf(page+len, PAGE_SIZE-len, "%llu %u\n",
8354 (unsigned long long)s << bb->shift,
8355 length << bb->shift);
8357 if (unack && len == 0)
8358 bb->unacked_exist = 0;
8360 if (read_seqretry(&bb->lock, seq))
8369 badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack)
8371 unsigned long long sector;
8375 /* Allow clearing via sysfs *only* for testing/debugging.
8376 * Normally only a successful write may clear a badblock
8379 if (page[0] == '-') {
8383 #endif /* DO_DEBUG */
8385 switch (sscanf(page, "%llu %d%c", §or, &length, &newline)) {
8387 if (newline != '\n')
8399 md_clear_badblocks(bb, sector, length);
8402 #endif /* DO_DEBUG */
8403 if (md_set_badblocks(bb, sector, length, !unack))
8409 static int md_notify_reboot(struct notifier_block *this,
8410 unsigned long code, void *x)
8412 struct list_head *tmp;
8413 struct mddev *mddev;
8416 for_each_mddev(mddev, tmp) {
8417 if (mddev_trylock(mddev)) {
8419 __md_stop_writes(mddev);
8420 mddev->safemode = 2;
8421 mddev_unlock(mddev);
8426 * certain more exotic SCSI devices are known to be
8427 * volatile wrt too early system reboots. While the
8428 * right place to handle this issue is the given
8429 * driver, we do want to have a safe RAID driver ...
8437 static struct notifier_block md_notifier = {
8438 .notifier_call = md_notify_reboot,
8440 .priority = INT_MAX, /* before any real devices */
8443 static void md_geninit(void)
8445 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
8447 proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops);
8450 static int __init md_init(void)
8454 md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0);
8458 md_misc_wq = alloc_workqueue("md_misc", 0, 0);
8462 if ((ret = register_blkdev(MD_MAJOR, "md")) < 0)
8465 if ((ret = register_blkdev(0, "mdp")) < 0)
8469 blk_register_region(MKDEV(MD_MAJOR, 0), 1UL<<MINORBITS, THIS_MODULE,
8470 md_probe, NULL, NULL);
8471 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
8472 md_probe, NULL, NULL);
8474 register_reboot_notifier(&md_notifier);
8475 raid_table_header = register_sysctl_table(raid_root_table);
8481 unregister_blkdev(MD_MAJOR, "md");
8483 destroy_workqueue(md_misc_wq);
8485 destroy_workqueue(md_wq);
8493 * Searches all registered partitions for autorun RAID arrays
8497 static LIST_HEAD(all_detected_devices);
8498 struct detected_devices_node {
8499 struct list_head list;
8503 void md_autodetect_dev(dev_t dev)
8505 struct detected_devices_node *node_detected_dev;
8507 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
8508 if (node_detected_dev) {
8509 node_detected_dev->dev = dev;
8510 list_add_tail(&node_detected_dev->list, &all_detected_devices);
8512 printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed"
8513 ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev));
8518 static void autostart_arrays(int part)
8520 struct md_rdev *rdev;
8521 struct detected_devices_node *node_detected_dev;
8523 int i_scanned, i_passed;
8528 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
8530 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
8532 node_detected_dev = list_entry(all_detected_devices.next,
8533 struct detected_devices_node, list);
8534 list_del(&node_detected_dev->list);
8535 dev = node_detected_dev->dev;
8536 kfree(node_detected_dev);
8537 rdev = md_import_device(dev,0, 90);
8541 if (test_bit(Faulty, &rdev->flags)) {
8545 set_bit(AutoDetected, &rdev->flags);
8546 list_add(&rdev->same_set, &pending_raid_disks);
8550 printk(KERN_INFO "md: Scanned %d and added %d devices.\n",
8551 i_scanned, i_passed);
8553 autorun_devices(part);
8556 #endif /* !MODULE */
8558 static __exit void md_exit(void)
8560 struct mddev *mddev;
8561 struct list_head *tmp;
8563 blk_unregister_region(MKDEV(MD_MAJOR,0), 1U << MINORBITS);
8564 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
8566 unregister_blkdev(MD_MAJOR,"md");
8567 unregister_blkdev(mdp_major, "mdp");
8568 unregister_reboot_notifier(&md_notifier);
8569 unregister_sysctl_table(raid_table_header);
8570 remove_proc_entry("mdstat", NULL);
8571 for_each_mddev(mddev, tmp) {
8572 export_array(mddev);
8573 mddev->hold_active = 0;
8575 destroy_workqueue(md_misc_wq);
8576 destroy_workqueue(md_wq);
8579 subsys_initcall(md_init);
8580 module_exit(md_exit)
8582 static int get_ro(char *buffer, struct kernel_param *kp)
8584 return sprintf(buffer, "%d", start_readonly);
8586 static int set_ro(const char *val, struct kernel_param *kp)
8589 int num = simple_strtoul(val, &e, 10);
8590 if (*val && (*e == '\0' || *e == '\n')) {
8591 start_readonly = num;
8597 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
8598 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
8600 module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR);
8602 EXPORT_SYMBOL(register_md_personality);
8603 EXPORT_SYMBOL(unregister_md_personality);
8604 EXPORT_SYMBOL(md_error);
8605 EXPORT_SYMBOL(md_done_sync);
8606 EXPORT_SYMBOL(md_write_start);
8607 EXPORT_SYMBOL(md_write_end);
8608 EXPORT_SYMBOL(md_register_thread);
8609 EXPORT_SYMBOL(md_unregister_thread);
8610 EXPORT_SYMBOL(md_wakeup_thread);
8611 EXPORT_SYMBOL(md_check_recovery);
8612 MODULE_LICENSE("GPL");
8613 MODULE_DESCRIPTION("MD RAID framework");
8615 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);