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 struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs,
163 if (!mddev || !mddev->bio_set)
164 return bio_alloc(gfp_mask, nr_iovecs);
166 b = bio_alloc_bioset(gfp_mask, nr_iovecs, mddev->bio_set);
171 EXPORT_SYMBOL_GPL(bio_alloc_mddev);
173 struct bio *bio_clone_mddev(struct bio *bio, gfp_t gfp_mask,
176 if (!mddev || !mddev->bio_set)
177 return bio_clone(bio, gfp_mask);
179 return bio_clone_bioset(bio, gfp_mask, mddev->bio_set);
181 EXPORT_SYMBOL_GPL(bio_clone_mddev);
183 void md_trim_bio(struct bio *bio, int offset, int size)
185 /* 'bio' is a cloned bio which we need to trim to match
186 * the given offset and size.
187 * This requires adjusting bi_sector, bi_size, and bi_io_vec
190 struct bio_vec *bvec;
194 if (offset == 0 && size == bio->bi_size)
197 bio->bi_sector += offset;
200 clear_bit(BIO_SEG_VALID, &bio->bi_flags);
202 while (bio->bi_idx < bio->bi_vcnt &&
203 bio->bi_io_vec[bio->bi_idx].bv_len <= offset) {
204 /* remove this whole bio_vec */
205 offset -= bio->bi_io_vec[bio->bi_idx].bv_len;
208 if (bio->bi_idx < bio->bi_vcnt) {
209 bio->bi_io_vec[bio->bi_idx].bv_offset += offset;
210 bio->bi_io_vec[bio->bi_idx].bv_len -= offset;
212 /* avoid any complications with bi_idx being non-zero*/
214 memmove(bio->bi_io_vec, bio->bi_io_vec+bio->bi_idx,
215 (bio->bi_vcnt - bio->bi_idx) * sizeof(struct bio_vec));
216 bio->bi_vcnt -= bio->bi_idx;
219 /* Make sure vcnt and last bv are not too big */
220 bio_for_each_segment(bvec, bio, i) {
221 if (sofar + bvec->bv_len > size)
222 bvec->bv_len = size - sofar;
223 if (bvec->bv_len == 0) {
227 sofar += bvec->bv_len;
230 EXPORT_SYMBOL_GPL(md_trim_bio);
233 * We have a system wide 'event count' that is incremented
234 * on any 'interesting' event, and readers of /proc/mdstat
235 * can use 'poll' or 'select' to find out when the event
239 * start array, stop array, error, add device, remove device,
240 * start build, activate spare
242 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
243 static atomic_t md_event_count;
244 void md_new_event(struct mddev *mddev)
246 atomic_inc(&md_event_count);
247 wake_up(&md_event_waiters);
249 EXPORT_SYMBOL_GPL(md_new_event);
251 /* Alternate version that can be called from interrupts
252 * when calling sysfs_notify isn't needed.
254 static void md_new_event_inintr(struct mddev *mddev)
256 atomic_inc(&md_event_count);
257 wake_up(&md_event_waiters);
261 * Enables to iterate over all existing md arrays
262 * all_mddevs_lock protects this list.
264 static LIST_HEAD(all_mddevs);
265 static DEFINE_SPINLOCK(all_mddevs_lock);
269 * iterates through all used mddevs in the system.
270 * We take care to grab the all_mddevs_lock whenever navigating
271 * the list, and to always hold a refcount when unlocked.
272 * Any code which breaks out of this loop while own
273 * a reference to the current mddev and must mddev_put it.
275 #define for_each_mddev(_mddev,_tmp) \
277 for (({ spin_lock(&all_mddevs_lock); \
278 _tmp = all_mddevs.next; \
280 ({ if (_tmp != &all_mddevs) \
281 mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\
282 spin_unlock(&all_mddevs_lock); \
283 if (_mddev) mddev_put(_mddev); \
284 _mddev = list_entry(_tmp, struct mddev, all_mddevs); \
285 _tmp != &all_mddevs;}); \
286 ({ spin_lock(&all_mddevs_lock); \
287 _tmp = _tmp->next;}) \
291 /* Rather than calling directly into the personality make_request function,
292 * IO requests come here first so that we can check if the device is
293 * being suspended pending a reconfiguration.
294 * We hold a refcount over the call to ->make_request. By the time that
295 * call has finished, the bio has been linked into some internal structure
296 * and so is visible to ->quiesce(), so we don't need the refcount any more.
298 static void md_make_request(struct request_queue *q, struct bio *bio)
300 const int rw = bio_data_dir(bio);
301 struct mddev *mddev = q->queuedata;
303 unsigned int sectors;
305 if (mddev == NULL || mddev->pers == NULL
310 if (mddev->ro == 1 && unlikely(rw == WRITE)) {
311 bio_endio(bio, bio_sectors(bio) == 0 ? 0 : -EROFS);
314 smp_rmb(); /* Ensure implications of 'active' are visible */
316 if (mddev->suspended) {
319 prepare_to_wait(&mddev->sb_wait, &__wait,
320 TASK_UNINTERRUPTIBLE);
321 if (!mddev->suspended)
327 finish_wait(&mddev->sb_wait, &__wait);
329 atomic_inc(&mddev->active_io);
333 * save the sectors now since our bio can
334 * go away inside make_request
336 sectors = bio_sectors(bio);
337 mddev->pers->make_request(mddev, bio);
339 cpu = part_stat_lock();
340 part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]);
341 part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw], sectors);
344 if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended)
345 wake_up(&mddev->sb_wait);
348 /* mddev_suspend makes sure no new requests are submitted
349 * to the device, and that any requests that have been submitted
350 * are completely handled.
351 * Once ->stop is called and completes, the module will be completely
354 void mddev_suspend(struct mddev *mddev)
356 BUG_ON(mddev->suspended);
357 mddev->suspended = 1;
359 wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0);
360 mddev->pers->quiesce(mddev, 1);
362 del_timer_sync(&mddev->safemode_timer);
364 EXPORT_SYMBOL_GPL(mddev_suspend);
366 void mddev_resume(struct mddev *mddev)
368 mddev->suspended = 0;
369 wake_up(&mddev->sb_wait);
370 mddev->pers->quiesce(mddev, 0);
372 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
373 md_wakeup_thread(mddev->thread);
374 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
376 EXPORT_SYMBOL_GPL(mddev_resume);
378 int mddev_congested(struct mddev *mddev, int bits)
380 return mddev->suspended;
382 EXPORT_SYMBOL(mddev_congested);
385 * Generic flush handling for md
388 static void md_end_flush(struct bio *bio, int err)
390 struct md_rdev *rdev = bio->bi_private;
391 struct mddev *mddev = rdev->mddev;
393 rdev_dec_pending(rdev, mddev);
395 if (atomic_dec_and_test(&mddev->flush_pending)) {
396 /* The pre-request flush has finished */
397 queue_work(md_wq, &mddev->flush_work);
402 static void md_submit_flush_data(struct work_struct *ws);
404 static void submit_flushes(struct work_struct *ws)
406 struct mddev *mddev = container_of(ws, struct mddev, flush_work);
407 struct md_rdev *rdev;
409 INIT_WORK(&mddev->flush_work, md_submit_flush_data);
410 atomic_set(&mddev->flush_pending, 1);
412 rdev_for_each_rcu(rdev, mddev)
413 if (rdev->raid_disk >= 0 &&
414 !test_bit(Faulty, &rdev->flags)) {
415 /* Take two references, one is dropped
416 * when request finishes, one after
417 * we reclaim rcu_read_lock
420 atomic_inc(&rdev->nr_pending);
421 atomic_inc(&rdev->nr_pending);
423 bi = bio_alloc_mddev(GFP_NOIO, 0, mddev);
424 bi->bi_end_io = md_end_flush;
425 bi->bi_private = rdev;
426 bi->bi_bdev = rdev->bdev;
427 atomic_inc(&mddev->flush_pending);
428 submit_bio(WRITE_FLUSH, bi);
430 rdev_dec_pending(rdev, mddev);
433 if (atomic_dec_and_test(&mddev->flush_pending))
434 queue_work(md_wq, &mddev->flush_work);
437 static void md_submit_flush_data(struct work_struct *ws)
439 struct mddev *mddev = container_of(ws, struct mddev, flush_work);
440 struct bio *bio = mddev->flush_bio;
442 if (bio->bi_size == 0)
443 /* an empty barrier - all done */
446 bio->bi_rw &= ~REQ_FLUSH;
447 mddev->pers->make_request(mddev, bio);
450 mddev->flush_bio = NULL;
451 wake_up(&mddev->sb_wait);
454 void md_flush_request(struct mddev *mddev, struct bio *bio)
456 spin_lock_irq(&mddev->write_lock);
457 wait_event_lock_irq(mddev->sb_wait,
460 mddev->flush_bio = bio;
461 spin_unlock_irq(&mddev->write_lock);
463 INIT_WORK(&mddev->flush_work, submit_flushes);
464 queue_work(md_wq, &mddev->flush_work);
466 EXPORT_SYMBOL(md_flush_request);
468 void md_unplug(struct blk_plug_cb *cb, bool from_schedule)
470 struct mddev *mddev = cb->data;
471 md_wakeup_thread(mddev->thread);
474 EXPORT_SYMBOL(md_unplug);
476 static inline struct mddev *mddev_get(struct mddev *mddev)
478 atomic_inc(&mddev->active);
482 static void mddev_delayed_delete(struct work_struct *ws);
484 static void mddev_put(struct mddev *mddev)
486 struct bio_set *bs = NULL;
488 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
490 if (!mddev->raid_disks && list_empty(&mddev->disks) &&
491 mddev->ctime == 0 && !mddev->hold_active) {
492 /* Array is not configured at all, and not held active,
494 list_del_init(&mddev->all_mddevs);
496 mddev->bio_set = NULL;
497 if (mddev->gendisk) {
498 /* We did a probe so need to clean up. Call
499 * queue_work inside the spinlock so that
500 * flush_workqueue() after mddev_find will
501 * succeed in waiting for the work to be done.
503 INIT_WORK(&mddev->del_work, mddev_delayed_delete);
504 queue_work(md_misc_wq, &mddev->del_work);
508 spin_unlock(&all_mddevs_lock);
513 void mddev_init(struct mddev *mddev)
515 mutex_init(&mddev->open_mutex);
516 mutex_init(&mddev->reconfig_mutex);
517 mutex_init(&mddev->bitmap_info.mutex);
518 INIT_LIST_HEAD(&mddev->disks);
519 INIT_LIST_HEAD(&mddev->all_mddevs);
520 init_timer(&mddev->safemode_timer);
521 atomic_set(&mddev->active, 1);
522 atomic_set(&mddev->openers, 0);
523 atomic_set(&mddev->active_io, 0);
524 spin_lock_init(&mddev->write_lock);
525 atomic_set(&mddev->flush_pending, 0);
526 init_waitqueue_head(&mddev->sb_wait);
527 init_waitqueue_head(&mddev->recovery_wait);
528 mddev->reshape_position = MaxSector;
529 mddev->reshape_backwards = 0;
530 mddev->resync_min = 0;
531 mddev->resync_max = MaxSector;
532 mddev->level = LEVEL_NONE;
534 EXPORT_SYMBOL_GPL(mddev_init);
536 static struct mddev * mddev_find(dev_t unit)
538 struct mddev *mddev, *new = NULL;
540 if (unit && MAJOR(unit) != MD_MAJOR)
541 unit &= ~((1<<MdpMinorShift)-1);
544 spin_lock(&all_mddevs_lock);
547 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
548 if (mddev->unit == unit) {
550 spin_unlock(&all_mddevs_lock);
556 list_add(&new->all_mddevs, &all_mddevs);
557 spin_unlock(&all_mddevs_lock);
558 new->hold_active = UNTIL_IOCTL;
562 /* find an unused unit number */
563 static int next_minor = 512;
564 int start = next_minor;
568 dev = MKDEV(MD_MAJOR, next_minor);
570 if (next_minor > MINORMASK)
572 if (next_minor == start) {
573 /* Oh dear, all in use. */
574 spin_unlock(&all_mddevs_lock);
580 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
581 if (mddev->unit == dev) {
587 new->md_minor = MINOR(dev);
588 new->hold_active = UNTIL_STOP;
589 list_add(&new->all_mddevs, &all_mddevs);
590 spin_unlock(&all_mddevs_lock);
593 spin_unlock(&all_mddevs_lock);
595 new = kzalloc(sizeof(*new), GFP_KERNEL);
600 if (MAJOR(unit) == MD_MAJOR)
601 new->md_minor = MINOR(unit);
603 new->md_minor = MINOR(unit) >> MdpMinorShift;
610 static inline int mddev_lock(struct mddev * mddev)
612 return mutex_lock_interruptible(&mddev->reconfig_mutex);
615 static inline int mddev_is_locked(struct mddev *mddev)
617 return mutex_is_locked(&mddev->reconfig_mutex);
620 static inline int mddev_trylock(struct mddev * mddev)
622 return mutex_trylock(&mddev->reconfig_mutex);
625 static struct attribute_group md_redundancy_group;
627 static void mddev_unlock(struct mddev * mddev)
629 if (mddev->to_remove) {
630 /* These cannot be removed under reconfig_mutex as
631 * an access to the files will try to take reconfig_mutex
632 * while holding the file unremovable, which leads to
634 * So hold set sysfs_active while the remove in happeing,
635 * and anything else which might set ->to_remove or my
636 * otherwise change the sysfs namespace will fail with
637 * -EBUSY if sysfs_active is still set.
638 * We set sysfs_active under reconfig_mutex and elsewhere
639 * test it under the same mutex to ensure its correct value
642 struct attribute_group *to_remove = mddev->to_remove;
643 mddev->to_remove = NULL;
644 mddev->sysfs_active = 1;
645 mutex_unlock(&mddev->reconfig_mutex);
647 if (mddev->kobj.sd) {
648 if (to_remove != &md_redundancy_group)
649 sysfs_remove_group(&mddev->kobj, to_remove);
650 if (mddev->pers == NULL ||
651 mddev->pers->sync_request == NULL) {
652 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
653 if (mddev->sysfs_action)
654 sysfs_put(mddev->sysfs_action);
655 mddev->sysfs_action = NULL;
658 mddev->sysfs_active = 0;
660 mutex_unlock(&mddev->reconfig_mutex);
662 /* As we've dropped the mutex we need a spinlock to
663 * make sure the thread doesn't disappear
665 spin_lock(&pers_lock);
666 md_wakeup_thread(mddev->thread);
667 spin_unlock(&pers_lock);
670 static struct md_rdev * find_rdev_nr(struct mddev *mddev, int nr)
672 struct md_rdev *rdev;
674 rdev_for_each(rdev, mddev)
675 if (rdev->desc_nr == nr)
681 static struct md_rdev *find_rdev_nr_rcu(struct mddev *mddev, int nr)
683 struct md_rdev *rdev;
685 rdev_for_each_rcu(rdev, mddev)
686 if (rdev->desc_nr == nr)
692 static struct md_rdev *find_rdev(struct mddev *mddev, dev_t dev)
694 struct md_rdev *rdev;
696 rdev_for_each(rdev, mddev)
697 if (rdev->bdev->bd_dev == dev)
703 static struct md_rdev *find_rdev_rcu(struct mddev *mddev, dev_t dev)
705 struct md_rdev *rdev;
707 rdev_for_each_rcu(rdev, mddev)
708 if (rdev->bdev->bd_dev == dev)
714 static struct md_personality *find_pers(int level, char *clevel)
716 struct md_personality *pers;
717 list_for_each_entry(pers, &pers_list, list) {
718 if (level != LEVEL_NONE && pers->level == level)
720 if (strcmp(pers->name, clevel)==0)
726 /* return the offset of the super block in 512byte sectors */
727 static inline sector_t calc_dev_sboffset(struct md_rdev *rdev)
729 sector_t num_sectors = i_size_read(rdev->bdev->bd_inode) / 512;
730 return MD_NEW_SIZE_SECTORS(num_sectors);
733 static int alloc_disk_sb(struct md_rdev * rdev)
738 rdev->sb_page = alloc_page(GFP_KERNEL);
739 if (!rdev->sb_page) {
740 printk(KERN_ALERT "md: out of memory.\n");
747 void md_rdev_clear(struct md_rdev *rdev)
750 put_page(rdev->sb_page);
752 rdev->sb_page = NULL;
757 put_page(rdev->bb_page);
758 rdev->bb_page = NULL;
760 kfree(rdev->badblocks.page);
761 rdev->badblocks.page = NULL;
763 EXPORT_SYMBOL_GPL(md_rdev_clear);
765 static void super_written(struct bio *bio, int error)
767 struct md_rdev *rdev = bio->bi_private;
768 struct mddev *mddev = rdev->mddev;
770 if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) {
771 printk("md: super_written gets error=%d, uptodate=%d\n",
772 error, test_bit(BIO_UPTODATE, &bio->bi_flags));
773 WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags));
774 md_error(mddev, rdev);
777 if (atomic_dec_and_test(&mddev->pending_writes))
778 wake_up(&mddev->sb_wait);
782 void md_super_write(struct mddev *mddev, struct md_rdev *rdev,
783 sector_t sector, int size, struct page *page)
785 /* write first size bytes of page to sector of rdev
786 * Increment mddev->pending_writes before returning
787 * and decrement it on completion, waking up sb_wait
788 * if zero is reached.
789 * If an error occurred, call md_error
791 struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, mddev);
793 bio->bi_bdev = rdev->meta_bdev ? rdev->meta_bdev : rdev->bdev;
794 bio->bi_sector = sector;
795 bio_add_page(bio, page, size, 0);
796 bio->bi_private = rdev;
797 bio->bi_end_io = super_written;
799 atomic_inc(&mddev->pending_writes);
800 submit_bio(WRITE_FLUSH_FUA, bio);
803 void md_super_wait(struct mddev *mddev)
805 /* wait for all superblock writes that were scheduled to complete */
808 prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE);
809 if (atomic_read(&mddev->pending_writes)==0)
813 finish_wait(&mddev->sb_wait, &wq);
816 static void bi_complete(struct bio *bio, int error)
818 complete((struct completion*)bio->bi_private);
821 int sync_page_io(struct md_rdev *rdev, sector_t sector, int size,
822 struct page *page, int rw, bool metadata_op)
824 struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, rdev->mddev);
825 struct completion event;
830 bio->bi_bdev = (metadata_op && rdev->meta_bdev) ?
831 rdev->meta_bdev : rdev->bdev;
833 bio->bi_sector = sector + rdev->sb_start;
834 else if (rdev->mddev->reshape_position != MaxSector &&
835 (rdev->mddev->reshape_backwards ==
836 (sector >= rdev->mddev->reshape_position)))
837 bio->bi_sector = sector + rdev->new_data_offset;
839 bio->bi_sector = sector + rdev->data_offset;
840 bio_add_page(bio, page, size, 0);
841 init_completion(&event);
842 bio->bi_private = &event;
843 bio->bi_end_io = bi_complete;
845 wait_for_completion(&event);
847 ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
851 EXPORT_SYMBOL_GPL(sync_page_io);
853 static int read_disk_sb(struct md_rdev * rdev, int size)
855 char b[BDEVNAME_SIZE];
856 if (!rdev->sb_page) {
864 if (!sync_page_io(rdev, 0, size, rdev->sb_page, READ, true))
870 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
871 bdevname(rdev->bdev,b));
875 static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
877 return sb1->set_uuid0 == sb2->set_uuid0 &&
878 sb1->set_uuid1 == sb2->set_uuid1 &&
879 sb1->set_uuid2 == sb2->set_uuid2 &&
880 sb1->set_uuid3 == sb2->set_uuid3;
883 static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
886 mdp_super_t *tmp1, *tmp2;
888 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
889 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
891 if (!tmp1 || !tmp2) {
893 printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n");
901 * nr_disks is not constant
906 ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0);
914 static u32 md_csum_fold(u32 csum)
916 csum = (csum & 0xffff) + (csum >> 16);
917 return (csum & 0xffff) + (csum >> 16);
920 static unsigned int calc_sb_csum(mdp_super_t * sb)
923 u32 *sb32 = (u32*)sb;
925 unsigned int disk_csum, csum;
927 disk_csum = sb->sb_csum;
930 for (i = 0; i < MD_SB_BYTES/4 ; i++)
932 csum = (newcsum & 0xffffffff) + (newcsum>>32);
936 /* This used to use csum_partial, which was wrong for several
937 * reasons including that different results are returned on
938 * different architectures. It isn't critical that we get exactly
939 * the same return value as before (we always csum_fold before
940 * testing, and that removes any differences). However as we
941 * know that csum_partial always returned a 16bit value on
942 * alphas, do a fold to maximise conformity to previous behaviour.
944 sb->sb_csum = md_csum_fold(disk_csum);
946 sb->sb_csum = disk_csum;
953 * Handle superblock details.
954 * We want to be able to handle multiple superblock formats
955 * so we have a common interface to them all, and an array of
956 * different handlers.
957 * We rely on user-space to write the initial superblock, and support
958 * reading and updating of superblocks.
959 * Interface methods are:
960 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version)
961 * loads and validates a superblock on dev.
962 * if refdev != NULL, compare superblocks on both devices
964 * 0 - dev has a superblock that is compatible with refdev
965 * 1 - dev has a superblock that is compatible and newer than refdev
966 * so dev should be used as the refdev in future
967 * -EINVAL superblock incompatible or invalid
968 * -othererror e.g. -EIO
970 * int validate_super(struct mddev *mddev, struct md_rdev *dev)
971 * Verify that dev is acceptable into mddev.
972 * The first time, mddev->raid_disks will be 0, and data from
973 * dev should be merged in. Subsequent calls check that dev
974 * is new enough. Return 0 or -EINVAL
976 * void sync_super(struct mddev *mddev, struct md_rdev *dev)
977 * Update the superblock for rdev with data in mddev
978 * This does not write to disc.
984 struct module *owner;
985 int (*load_super)(struct md_rdev *rdev,
986 struct md_rdev *refdev,
988 int (*validate_super)(struct mddev *mddev,
989 struct md_rdev *rdev);
990 void (*sync_super)(struct mddev *mddev,
991 struct md_rdev *rdev);
992 unsigned long long (*rdev_size_change)(struct md_rdev *rdev,
993 sector_t num_sectors);
994 int (*allow_new_offset)(struct md_rdev *rdev,
995 unsigned long long new_offset);
999 * Check that the given mddev has no bitmap.
1001 * This function is called from the run method of all personalities that do not
1002 * support bitmaps. It prints an error message and returns non-zero if mddev
1003 * has a bitmap. Otherwise, it returns 0.
1006 int md_check_no_bitmap(struct mddev *mddev)
1008 if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset)
1010 printk(KERN_ERR "%s: bitmaps are not supported for %s\n",
1011 mdname(mddev), mddev->pers->name);
1014 EXPORT_SYMBOL(md_check_no_bitmap);
1017 * load_super for 0.90.0
1019 static int super_90_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
1021 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1026 * Calculate the position of the superblock (512byte sectors),
1027 * it's at the end of the disk.
1029 * It also happens to be a multiple of 4Kb.
1031 rdev->sb_start = calc_dev_sboffset(rdev);
1033 ret = read_disk_sb(rdev, MD_SB_BYTES);
1034 if (ret) return ret;
1038 bdevname(rdev->bdev, b);
1039 sb = page_address(rdev->sb_page);
1041 if (sb->md_magic != MD_SB_MAGIC) {
1042 printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
1047 if (sb->major_version != 0 ||
1048 sb->minor_version < 90 ||
1049 sb->minor_version > 91) {
1050 printk(KERN_WARNING "Bad version number %d.%d on %s\n",
1051 sb->major_version, sb->minor_version,
1056 if (sb->raid_disks <= 0)
1059 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
1060 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
1065 rdev->preferred_minor = sb->md_minor;
1066 rdev->data_offset = 0;
1067 rdev->new_data_offset = 0;
1068 rdev->sb_size = MD_SB_BYTES;
1069 rdev->badblocks.shift = -1;
1071 if (sb->level == LEVEL_MULTIPATH)
1074 rdev->desc_nr = sb->this_disk.number;
1080 mdp_super_t *refsb = page_address(refdev->sb_page);
1081 if (!uuid_equal(refsb, sb)) {
1082 printk(KERN_WARNING "md: %s has different UUID to %s\n",
1083 b, bdevname(refdev->bdev,b2));
1086 if (!sb_equal(refsb, sb)) {
1087 printk(KERN_WARNING "md: %s has same UUID"
1088 " but different superblock to %s\n",
1089 b, bdevname(refdev->bdev, b2));
1093 ev2 = md_event(refsb);
1099 rdev->sectors = rdev->sb_start;
1100 /* Limit to 4TB as metadata cannot record more than that.
1101 * (not needed for Linear and RAID0 as metadata doesn't
1104 if (rdev->sectors >= (2ULL << 32) && sb->level >= 1)
1105 rdev->sectors = (2ULL << 32) - 2;
1107 if (rdev->sectors < ((sector_t)sb->size) * 2 && sb->level >= 1)
1108 /* "this cannot possibly happen" ... */
1116 * validate_super for 0.90.0
1118 static int super_90_validate(struct mddev *mddev, struct md_rdev *rdev)
1121 mdp_super_t *sb = page_address(rdev->sb_page);
1122 __u64 ev1 = md_event(sb);
1124 rdev->raid_disk = -1;
1125 clear_bit(Faulty, &rdev->flags);
1126 clear_bit(In_sync, &rdev->flags);
1127 clear_bit(WriteMostly, &rdev->flags);
1129 if (mddev->raid_disks == 0) {
1130 mddev->major_version = 0;
1131 mddev->minor_version = sb->minor_version;
1132 mddev->patch_version = sb->patch_version;
1133 mddev->external = 0;
1134 mddev->chunk_sectors = sb->chunk_size >> 9;
1135 mddev->ctime = sb->ctime;
1136 mddev->utime = sb->utime;
1137 mddev->level = sb->level;
1138 mddev->clevel[0] = 0;
1139 mddev->layout = sb->layout;
1140 mddev->raid_disks = sb->raid_disks;
1141 mddev->dev_sectors = ((sector_t)sb->size) * 2;
1142 mddev->events = ev1;
1143 mddev->bitmap_info.offset = 0;
1144 mddev->bitmap_info.space = 0;
1145 /* bitmap can use 60 K after the 4K superblocks */
1146 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
1147 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
1148 mddev->reshape_backwards = 0;
1150 if (mddev->minor_version >= 91) {
1151 mddev->reshape_position = sb->reshape_position;
1152 mddev->delta_disks = sb->delta_disks;
1153 mddev->new_level = sb->new_level;
1154 mddev->new_layout = sb->new_layout;
1155 mddev->new_chunk_sectors = sb->new_chunk >> 9;
1156 if (mddev->delta_disks < 0)
1157 mddev->reshape_backwards = 1;
1159 mddev->reshape_position = MaxSector;
1160 mddev->delta_disks = 0;
1161 mddev->new_level = mddev->level;
1162 mddev->new_layout = mddev->layout;
1163 mddev->new_chunk_sectors = mddev->chunk_sectors;
1166 if (sb->state & (1<<MD_SB_CLEAN))
1167 mddev->recovery_cp = MaxSector;
1169 if (sb->events_hi == sb->cp_events_hi &&
1170 sb->events_lo == sb->cp_events_lo) {
1171 mddev->recovery_cp = sb->recovery_cp;
1173 mddev->recovery_cp = 0;
1176 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
1177 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
1178 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
1179 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
1181 mddev->max_disks = MD_SB_DISKS;
1183 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
1184 mddev->bitmap_info.file == NULL) {
1185 mddev->bitmap_info.offset =
1186 mddev->bitmap_info.default_offset;
1187 mddev->bitmap_info.space =
1188 mddev->bitmap_info.space;
1191 } else if (mddev->pers == NULL) {
1192 /* Insist on good event counter while assembling, except
1193 * for spares (which don't need an event count) */
1195 if (sb->disks[rdev->desc_nr].state & (
1196 (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE)))
1197 if (ev1 < mddev->events)
1199 } else if (mddev->bitmap) {
1200 /* if adding to array with a bitmap, then we can accept an
1201 * older device ... but not too old.
1203 if (ev1 < mddev->bitmap->events_cleared)
1206 if (ev1 < mddev->events)
1207 /* just a hot-add of a new device, leave raid_disk at -1 */
1211 if (mddev->level != LEVEL_MULTIPATH) {
1212 desc = sb->disks + rdev->desc_nr;
1214 if (desc->state & (1<<MD_DISK_FAULTY))
1215 set_bit(Faulty, &rdev->flags);
1216 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
1217 desc->raid_disk < mddev->raid_disks */) {
1218 set_bit(In_sync, &rdev->flags);
1219 rdev->raid_disk = desc->raid_disk;
1220 } else if (desc->state & (1<<MD_DISK_ACTIVE)) {
1221 /* active but not in sync implies recovery up to
1222 * reshape position. We don't know exactly where
1223 * that is, so set to zero for now */
1224 if (mddev->minor_version >= 91) {
1225 rdev->recovery_offset = 0;
1226 rdev->raid_disk = desc->raid_disk;
1229 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
1230 set_bit(WriteMostly, &rdev->flags);
1231 } else /* MULTIPATH are always insync */
1232 set_bit(In_sync, &rdev->flags);
1237 * sync_super for 0.90.0
1239 static void super_90_sync(struct mddev *mddev, struct md_rdev *rdev)
1242 struct md_rdev *rdev2;
1243 int next_spare = mddev->raid_disks;
1246 /* make rdev->sb match mddev data..
1249 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1250 * 3/ any empty disks < next_spare become removed
1252 * disks[0] gets initialised to REMOVED because
1253 * we cannot be sure from other fields if it has
1254 * been initialised or not.
1257 int active=0, working=0,failed=0,spare=0,nr_disks=0;
1259 rdev->sb_size = MD_SB_BYTES;
1261 sb = page_address(rdev->sb_page);
1263 memset(sb, 0, sizeof(*sb));
1265 sb->md_magic = MD_SB_MAGIC;
1266 sb->major_version = mddev->major_version;
1267 sb->patch_version = mddev->patch_version;
1268 sb->gvalid_words = 0; /* ignored */
1269 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
1270 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
1271 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
1272 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
1274 sb->ctime = mddev->ctime;
1275 sb->level = mddev->level;
1276 sb->size = mddev->dev_sectors / 2;
1277 sb->raid_disks = mddev->raid_disks;
1278 sb->md_minor = mddev->md_minor;
1279 sb->not_persistent = 0;
1280 sb->utime = mddev->utime;
1282 sb->events_hi = (mddev->events>>32);
1283 sb->events_lo = (u32)mddev->events;
1285 if (mddev->reshape_position == MaxSector)
1286 sb->minor_version = 90;
1288 sb->minor_version = 91;
1289 sb->reshape_position = mddev->reshape_position;
1290 sb->new_level = mddev->new_level;
1291 sb->delta_disks = mddev->delta_disks;
1292 sb->new_layout = mddev->new_layout;
1293 sb->new_chunk = mddev->new_chunk_sectors << 9;
1295 mddev->minor_version = sb->minor_version;
1298 sb->recovery_cp = mddev->recovery_cp;
1299 sb->cp_events_hi = (mddev->events>>32);
1300 sb->cp_events_lo = (u32)mddev->events;
1301 if (mddev->recovery_cp == MaxSector)
1302 sb->state = (1<< MD_SB_CLEAN);
1304 sb->recovery_cp = 0;
1306 sb->layout = mddev->layout;
1307 sb->chunk_size = mddev->chunk_sectors << 9;
1309 if (mddev->bitmap && mddev->bitmap_info.file == NULL)
1310 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
1312 sb->disks[0].state = (1<<MD_DISK_REMOVED);
1313 rdev_for_each(rdev2, mddev) {
1316 int is_active = test_bit(In_sync, &rdev2->flags);
1318 if (rdev2->raid_disk >= 0 &&
1319 sb->minor_version >= 91)
1320 /* we have nowhere to store the recovery_offset,
1321 * but if it is not below the reshape_position,
1322 * we can piggy-back on that.
1325 if (rdev2->raid_disk < 0 ||
1326 test_bit(Faulty, &rdev2->flags))
1329 desc_nr = rdev2->raid_disk;
1331 desc_nr = next_spare++;
1332 rdev2->desc_nr = desc_nr;
1333 d = &sb->disks[rdev2->desc_nr];
1335 d->number = rdev2->desc_nr;
1336 d->major = MAJOR(rdev2->bdev->bd_dev);
1337 d->minor = MINOR(rdev2->bdev->bd_dev);
1339 d->raid_disk = rdev2->raid_disk;
1341 d->raid_disk = rdev2->desc_nr; /* compatibility */
1342 if (test_bit(Faulty, &rdev2->flags))
1343 d->state = (1<<MD_DISK_FAULTY);
1344 else if (is_active) {
1345 d->state = (1<<MD_DISK_ACTIVE);
1346 if (test_bit(In_sync, &rdev2->flags))
1347 d->state |= (1<<MD_DISK_SYNC);
1355 if (test_bit(WriteMostly, &rdev2->flags))
1356 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1358 /* now set the "removed" and "faulty" bits on any missing devices */
1359 for (i=0 ; i < mddev->raid_disks ; i++) {
1360 mdp_disk_t *d = &sb->disks[i];
1361 if (d->state == 0 && d->number == 0) {
1364 d->state = (1<<MD_DISK_REMOVED);
1365 d->state |= (1<<MD_DISK_FAULTY);
1369 sb->nr_disks = nr_disks;
1370 sb->active_disks = active;
1371 sb->working_disks = working;
1372 sb->failed_disks = failed;
1373 sb->spare_disks = spare;
1375 sb->this_disk = sb->disks[rdev->desc_nr];
1376 sb->sb_csum = calc_sb_csum(sb);
1380 * rdev_size_change for 0.90.0
1382 static unsigned long long
1383 super_90_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
1385 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1386 return 0; /* component must fit device */
1387 if (rdev->mddev->bitmap_info.offset)
1388 return 0; /* can't move bitmap */
1389 rdev->sb_start = calc_dev_sboffset(rdev);
1390 if (!num_sectors || num_sectors > rdev->sb_start)
1391 num_sectors = rdev->sb_start;
1392 /* Limit to 4TB as metadata cannot record more than that.
1393 * 4TB == 2^32 KB, or 2*2^32 sectors.
1395 if (num_sectors >= (2ULL << 32) && rdev->mddev->level >= 1)
1396 num_sectors = (2ULL << 32) - 2;
1397 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1399 md_super_wait(rdev->mddev);
1404 super_90_allow_new_offset(struct md_rdev *rdev, unsigned long long new_offset)
1406 /* non-zero offset changes not possible with v0.90 */
1407 return new_offset == 0;
1411 * version 1 superblock
1414 static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb)
1418 unsigned long long newcsum;
1419 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1420 __le32 *isuper = (__le32*)sb;
1422 disk_csum = sb->sb_csum;
1425 for (; size >= 4; size -= 4)
1426 newcsum += le32_to_cpu(*isuper++);
1429 newcsum += le16_to_cpu(*(__le16*) isuper);
1431 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1432 sb->sb_csum = disk_csum;
1433 return cpu_to_le32(csum);
1436 static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors,
1438 static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
1440 struct mdp_superblock_1 *sb;
1444 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1448 * Calculate the position of the superblock in 512byte sectors.
1449 * It is always aligned to a 4K boundary and
1450 * depeding on minor_version, it can be:
1451 * 0: At least 8K, but less than 12K, from end of device
1452 * 1: At start of device
1453 * 2: 4K from start of device.
1455 switch(minor_version) {
1457 sb_start = i_size_read(rdev->bdev->bd_inode) >> 9;
1459 sb_start &= ~(sector_t)(4*2-1);
1470 rdev->sb_start = sb_start;
1472 /* superblock is rarely larger than 1K, but it can be larger,
1473 * and it is safe to read 4k, so we do that
1475 ret = read_disk_sb(rdev, 4096);
1476 if (ret) return ret;
1479 sb = page_address(rdev->sb_page);
1481 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1482 sb->major_version != cpu_to_le32(1) ||
1483 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1484 le64_to_cpu(sb->super_offset) != rdev->sb_start ||
1485 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1488 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1489 printk("md: invalid superblock checksum on %s\n",
1490 bdevname(rdev->bdev,b));
1493 if (le64_to_cpu(sb->data_size) < 10) {
1494 printk("md: data_size too small on %s\n",
1495 bdevname(rdev->bdev,b));
1500 memcmp(sb->pad3, sb->pad3+1, sizeof(sb->pad3) - sizeof(sb->pad3[1])))
1501 /* Some padding is non-zero, might be a new feature */
1504 rdev->preferred_minor = 0xffff;
1505 rdev->data_offset = le64_to_cpu(sb->data_offset);
1506 rdev->new_data_offset = rdev->data_offset;
1507 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE) &&
1508 (le32_to_cpu(sb->feature_map) & MD_FEATURE_NEW_OFFSET))
1509 rdev->new_data_offset += (s32)le32_to_cpu(sb->new_offset);
1510 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1512 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1513 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1514 if (rdev->sb_size & bmask)
1515 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1518 && rdev->data_offset < sb_start + (rdev->sb_size/512))
1521 && rdev->new_data_offset < sb_start + (rdev->sb_size/512))
1524 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1527 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1529 if (!rdev->bb_page) {
1530 rdev->bb_page = alloc_page(GFP_KERNEL);
1534 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BAD_BLOCKS) &&
1535 rdev->badblocks.count == 0) {
1536 /* need to load the bad block list.
1537 * Currently we limit it to one page.
1543 int sectors = le16_to_cpu(sb->bblog_size);
1544 if (sectors > (PAGE_SIZE / 512))
1546 offset = le32_to_cpu(sb->bblog_offset);
1549 bb_sector = (long long)offset;
1550 if (!sync_page_io(rdev, bb_sector, sectors << 9,
1551 rdev->bb_page, READ, true))
1553 bbp = (u64 *)page_address(rdev->bb_page);
1554 rdev->badblocks.shift = sb->bblog_shift;
1555 for (i = 0 ; i < (sectors << (9-3)) ; i++, bbp++) {
1556 u64 bb = le64_to_cpu(*bbp);
1557 int count = bb & (0x3ff);
1558 u64 sector = bb >> 10;
1559 sector <<= sb->bblog_shift;
1560 count <<= sb->bblog_shift;
1563 if (md_set_badblocks(&rdev->badblocks,
1564 sector, count, 1) == 0)
1567 } else if (sb->bblog_offset == 0)
1568 rdev->badblocks.shift = -1;
1574 struct mdp_superblock_1 *refsb = page_address(refdev->sb_page);
1576 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1577 sb->level != refsb->level ||
1578 sb->layout != refsb->layout ||
1579 sb->chunksize != refsb->chunksize) {
1580 printk(KERN_WARNING "md: %s has strangely different"
1581 " superblock to %s\n",
1582 bdevname(rdev->bdev,b),
1583 bdevname(refdev->bdev,b2));
1586 ev1 = le64_to_cpu(sb->events);
1587 ev2 = le64_to_cpu(refsb->events);
1594 if (minor_version) {
1595 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9);
1596 sectors -= rdev->data_offset;
1598 sectors = rdev->sb_start;
1599 if (sectors < le64_to_cpu(sb->data_size))
1601 rdev->sectors = le64_to_cpu(sb->data_size);
1605 static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev)
1607 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
1608 __u64 ev1 = le64_to_cpu(sb->events);
1610 rdev->raid_disk = -1;
1611 clear_bit(Faulty, &rdev->flags);
1612 clear_bit(In_sync, &rdev->flags);
1613 clear_bit(WriteMostly, &rdev->flags);
1615 if (mddev->raid_disks == 0) {
1616 mddev->major_version = 1;
1617 mddev->patch_version = 0;
1618 mddev->external = 0;
1619 mddev->chunk_sectors = le32_to_cpu(sb->chunksize);
1620 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1621 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1622 mddev->level = le32_to_cpu(sb->level);
1623 mddev->clevel[0] = 0;
1624 mddev->layout = le32_to_cpu(sb->layout);
1625 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1626 mddev->dev_sectors = le64_to_cpu(sb->size);
1627 mddev->events = ev1;
1628 mddev->bitmap_info.offset = 0;
1629 mddev->bitmap_info.space = 0;
1630 /* Default location for bitmap is 1K after superblock
1631 * using 3K - total of 4K
1633 mddev->bitmap_info.default_offset = 1024 >> 9;
1634 mddev->bitmap_info.default_space = (4096-1024) >> 9;
1635 mddev->reshape_backwards = 0;
1637 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1638 memcpy(mddev->uuid, sb->set_uuid, 16);
1640 mddev->max_disks = (4096-256)/2;
1642 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1643 mddev->bitmap_info.file == NULL) {
1644 mddev->bitmap_info.offset =
1645 (__s32)le32_to_cpu(sb->bitmap_offset);
1646 /* Metadata doesn't record how much space is available.
1647 * For 1.0, we assume we can use up to the superblock
1648 * if before, else to 4K beyond superblock.
1649 * For others, assume no change is possible.
1651 if (mddev->minor_version > 0)
1652 mddev->bitmap_info.space = 0;
1653 else if (mddev->bitmap_info.offset > 0)
1654 mddev->bitmap_info.space =
1655 8 - mddev->bitmap_info.offset;
1657 mddev->bitmap_info.space =
1658 -mddev->bitmap_info.offset;
1661 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1662 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1663 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1664 mddev->new_level = le32_to_cpu(sb->new_level);
1665 mddev->new_layout = le32_to_cpu(sb->new_layout);
1666 mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk);
1667 if (mddev->delta_disks < 0 ||
1668 (mddev->delta_disks == 0 &&
1669 (le32_to_cpu(sb->feature_map)
1670 & MD_FEATURE_RESHAPE_BACKWARDS)))
1671 mddev->reshape_backwards = 1;
1673 mddev->reshape_position = MaxSector;
1674 mddev->delta_disks = 0;
1675 mddev->new_level = mddev->level;
1676 mddev->new_layout = mddev->layout;
1677 mddev->new_chunk_sectors = mddev->chunk_sectors;
1680 } else if (mddev->pers == NULL) {
1681 /* Insist of good event counter while assembling, except for
1682 * spares (which don't need an event count) */
1684 if (rdev->desc_nr >= 0 &&
1685 rdev->desc_nr < le32_to_cpu(sb->max_dev) &&
1686 le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < 0xfffe)
1687 if (ev1 < mddev->events)
1689 } else if (mddev->bitmap) {
1690 /* If adding to array with a bitmap, then we can accept an
1691 * older device, but not too old.
1693 if (ev1 < mddev->bitmap->events_cleared)
1696 if (ev1 < mddev->events)
1697 /* just a hot-add of a new device, leave raid_disk at -1 */
1700 if (mddev->level != LEVEL_MULTIPATH) {
1702 if (rdev->desc_nr < 0 ||
1703 rdev->desc_nr >= le32_to_cpu(sb->max_dev)) {
1707 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1709 case 0xffff: /* spare */
1711 case 0xfffe: /* faulty */
1712 set_bit(Faulty, &rdev->flags);
1715 if ((le32_to_cpu(sb->feature_map) &
1716 MD_FEATURE_RECOVERY_OFFSET))
1717 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1719 set_bit(In_sync, &rdev->flags);
1720 rdev->raid_disk = role;
1723 if (sb->devflags & WriteMostly1)
1724 set_bit(WriteMostly, &rdev->flags);
1725 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_REPLACEMENT)
1726 set_bit(Replacement, &rdev->flags);
1727 } else /* MULTIPATH are always insync */
1728 set_bit(In_sync, &rdev->flags);
1733 static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev)
1735 struct mdp_superblock_1 *sb;
1736 struct md_rdev *rdev2;
1738 /* make rdev->sb match mddev and rdev data. */
1740 sb = page_address(rdev->sb_page);
1742 sb->feature_map = 0;
1744 sb->recovery_offset = cpu_to_le64(0);
1745 memset(sb->pad3, 0, sizeof(sb->pad3));
1747 sb->utime = cpu_to_le64((__u64)mddev->utime);
1748 sb->events = cpu_to_le64(mddev->events);
1750 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1752 sb->resync_offset = cpu_to_le64(0);
1754 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
1756 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
1757 sb->size = cpu_to_le64(mddev->dev_sectors);
1758 sb->chunksize = cpu_to_le32(mddev->chunk_sectors);
1759 sb->level = cpu_to_le32(mddev->level);
1760 sb->layout = cpu_to_le32(mddev->layout);
1762 if (test_bit(WriteMostly, &rdev->flags))
1763 sb->devflags |= WriteMostly1;
1765 sb->devflags &= ~WriteMostly1;
1766 sb->data_offset = cpu_to_le64(rdev->data_offset);
1767 sb->data_size = cpu_to_le64(rdev->sectors);
1769 if (mddev->bitmap && mddev->bitmap_info.file == NULL) {
1770 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset);
1771 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
1774 if (rdev->raid_disk >= 0 &&
1775 !test_bit(In_sync, &rdev->flags)) {
1777 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1778 sb->recovery_offset =
1779 cpu_to_le64(rdev->recovery_offset);
1781 if (test_bit(Replacement, &rdev->flags))
1783 cpu_to_le32(MD_FEATURE_REPLACEMENT);
1785 if (mddev->reshape_position != MaxSector) {
1786 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1787 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1788 sb->new_layout = cpu_to_le32(mddev->new_layout);
1789 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1790 sb->new_level = cpu_to_le32(mddev->new_level);
1791 sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors);
1792 if (mddev->delta_disks == 0 &&
1793 mddev->reshape_backwards)
1795 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS);
1796 if (rdev->new_data_offset != rdev->data_offset) {
1798 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET);
1799 sb->new_offset = cpu_to_le32((__u32)(rdev->new_data_offset
1800 - rdev->data_offset));
1804 if (rdev->badblocks.count == 0)
1805 /* Nothing to do for bad blocks*/ ;
1806 else if (sb->bblog_offset == 0)
1807 /* Cannot record bad blocks on this device */
1808 md_error(mddev, rdev);
1810 struct badblocks *bb = &rdev->badblocks;
1811 u64 *bbp = (u64 *)page_address(rdev->bb_page);
1813 sb->feature_map |= cpu_to_le32(MD_FEATURE_BAD_BLOCKS);
1818 seq = read_seqbegin(&bb->lock);
1820 memset(bbp, 0xff, PAGE_SIZE);
1822 for (i = 0 ; i < bb->count ; i++) {
1823 u64 internal_bb = p[i];
1824 u64 store_bb = ((BB_OFFSET(internal_bb) << 10)
1825 | BB_LEN(internal_bb));
1826 bbp[i] = cpu_to_le64(store_bb);
1829 if (read_seqretry(&bb->lock, seq))
1832 bb->sector = (rdev->sb_start +
1833 (int)le32_to_cpu(sb->bblog_offset));
1834 bb->size = le16_to_cpu(sb->bblog_size);
1839 rdev_for_each(rdev2, mddev)
1840 if (rdev2->desc_nr+1 > max_dev)
1841 max_dev = rdev2->desc_nr+1;
1843 if (max_dev > le32_to_cpu(sb->max_dev)) {
1845 sb->max_dev = cpu_to_le32(max_dev);
1846 rdev->sb_size = max_dev * 2 + 256;
1847 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1848 if (rdev->sb_size & bmask)
1849 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1851 max_dev = le32_to_cpu(sb->max_dev);
1853 for (i=0; i<max_dev;i++)
1854 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1856 rdev_for_each(rdev2, mddev) {
1858 if (test_bit(Faulty, &rdev2->flags))
1859 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1860 else if (test_bit(In_sync, &rdev2->flags))
1861 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1862 else if (rdev2->raid_disk >= 0)
1863 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1865 sb->dev_roles[i] = cpu_to_le16(0xffff);
1868 sb->sb_csum = calc_sb_1_csum(sb);
1871 static unsigned long long
1872 super_1_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
1874 struct mdp_superblock_1 *sb;
1875 sector_t max_sectors;
1876 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1877 return 0; /* component must fit device */
1878 if (rdev->data_offset != rdev->new_data_offset)
1879 return 0; /* too confusing */
1880 if (rdev->sb_start < rdev->data_offset) {
1881 /* minor versions 1 and 2; superblock before data */
1882 max_sectors = i_size_read(rdev->bdev->bd_inode) >> 9;
1883 max_sectors -= rdev->data_offset;
1884 if (!num_sectors || num_sectors > max_sectors)
1885 num_sectors = max_sectors;
1886 } else if (rdev->mddev->bitmap_info.offset) {
1887 /* minor version 0 with bitmap we can't move */
1890 /* minor version 0; superblock after data */
1892 sb_start = (i_size_read(rdev->bdev->bd_inode) >> 9) - 8*2;
1893 sb_start &= ~(sector_t)(4*2 - 1);
1894 max_sectors = rdev->sectors + sb_start - rdev->sb_start;
1895 if (!num_sectors || num_sectors > max_sectors)
1896 num_sectors = max_sectors;
1897 rdev->sb_start = sb_start;
1899 sb = page_address(rdev->sb_page);
1900 sb->data_size = cpu_to_le64(num_sectors);
1901 sb->super_offset = rdev->sb_start;
1902 sb->sb_csum = calc_sb_1_csum(sb);
1903 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1905 md_super_wait(rdev->mddev);
1911 super_1_allow_new_offset(struct md_rdev *rdev,
1912 unsigned long long new_offset)
1914 /* All necessary checks on new >= old have been done */
1915 struct bitmap *bitmap;
1916 if (new_offset >= rdev->data_offset)
1919 /* with 1.0 metadata, there is no metadata to tread on
1920 * so we can always move back */
1921 if (rdev->mddev->minor_version == 0)
1924 /* otherwise we must be sure not to step on
1925 * any metadata, so stay:
1926 * 36K beyond start of superblock
1927 * beyond end of badblocks
1928 * beyond write-intent bitmap
1930 if (rdev->sb_start + (32+4)*2 > new_offset)
1932 bitmap = rdev->mddev->bitmap;
1933 if (bitmap && !rdev->mddev->bitmap_info.file &&
1934 rdev->sb_start + rdev->mddev->bitmap_info.offset +
1935 bitmap->storage.file_pages * (PAGE_SIZE>>9) > new_offset)
1937 if (rdev->badblocks.sector + rdev->badblocks.size > new_offset)
1943 static struct super_type super_types[] = {
1946 .owner = THIS_MODULE,
1947 .load_super = super_90_load,
1948 .validate_super = super_90_validate,
1949 .sync_super = super_90_sync,
1950 .rdev_size_change = super_90_rdev_size_change,
1951 .allow_new_offset = super_90_allow_new_offset,
1955 .owner = THIS_MODULE,
1956 .load_super = super_1_load,
1957 .validate_super = super_1_validate,
1958 .sync_super = super_1_sync,
1959 .rdev_size_change = super_1_rdev_size_change,
1960 .allow_new_offset = super_1_allow_new_offset,
1964 static void sync_super(struct mddev *mddev, struct md_rdev *rdev)
1966 if (mddev->sync_super) {
1967 mddev->sync_super(mddev, rdev);
1971 BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types));
1973 super_types[mddev->major_version].sync_super(mddev, rdev);
1976 static int match_mddev_units(struct mddev *mddev1, struct mddev *mddev2)
1978 struct md_rdev *rdev, *rdev2;
1981 rdev_for_each_rcu(rdev, mddev1)
1982 rdev_for_each_rcu(rdev2, mddev2)
1983 if (rdev->bdev->bd_contains ==
1984 rdev2->bdev->bd_contains) {
1992 static LIST_HEAD(pending_raid_disks);
1995 * Try to register data integrity profile for an mddev
1997 * This is called when an array is started and after a disk has been kicked
1998 * from the array. It only succeeds if all working and active component devices
1999 * are integrity capable with matching profiles.
2001 int md_integrity_register(struct mddev *mddev)
2003 struct md_rdev *rdev, *reference = NULL;
2005 if (list_empty(&mddev->disks))
2006 return 0; /* nothing to do */
2007 if (!mddev->gendisk || blk_get_integrity(mddev->gendisk))
2008 return 0; /* shouldn't register, or already is */
2009 rdev_for_each(rdev, mddev) {
2010 /* skip spares and non-functional disks */
2011 if (test_bit(Faulty, &rdev->flags))
2013 if (rdev->raid_disk < 0)
2016 /* Use the first rdev as the reference */
2020 /* does this rdev's profile match the reference profile? */
2021 if (blk_integrity_compare(reference->bdev->bd_disk,
2022 rdev->bdev->bd_disk) < 0)
2025 if (!reference || !bdev_get_integrity(reference->bdev))
2028 * All component devices are integrity capable and have matching
2029 * profiles, register the common profile for the md device.
2031 if (blk_integrity_register(mddev->gendisk,
2032 bdev_get_integrity(reference->bdev)) != 0) {
2033 printk(KERN_ERR "md: failed to register integrity for %s\n",
2037 printk(KERN_NOTICE "md: data integrity enabled on %s\n", mdname(mddev));
2038 if (bioset_integrity_create(mddev->bio_set, BIO_POOL_SIZE)) {
2039 printk(KERN_ERR "md: failed to create integrity pool for %s\n",
2045 EXPORT_SYMBOL(md_integrity_register);
2047 /* Disable data integrity if non-capable/non-matching disk is being added */
2048 void md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev)
2050 struct blk_integrity *bi_rdev;
2051 struct blk_integrity *bi_mddev;
2053 if (!mddev->gendisk)
2056 bi_rdev = bdev_get_integrity(rdev->bdev);
2057 bi_mddev = blk_get_integrity(mddev->gendisk);
2059 if (!bi_mddev) /* nothing to do */
2061 if (rdev->raid_disk < 0) /* skip spares */
2063 if (bi_rdev && blk_integrity_compare(mddev->gendisk,
2064 rdev->bdev->bd_disk) >= 0)
2066 printk(KERN_NOTICE "disabling data integrity on %s\n", mdname(mddev));
2067 blk_integrity_unregister(mddev->gendisk);
2069 EXPORT_SYMBOL(md_integrity_add_rdev);
2071 static int bind_rdev_to_array(struct md_rdev * rdev, struct mddev * mddev)
2073 char b[BDEVNAME_SIZE];
2083 /* prevent duplicates */
2084 if (find_rdev(mddev, rdev->bdev->bd_dev))
2087 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2088 if (rdev->sectors && (mddev->dev_sectors == 0 ||
2089 rdev->sectors < mddev->dev_sectors)) {
2091 /* Cannot change size, so fail
2092 * If mddev->level <= 0, then we don't care
2093 * about aligning sizes (e.g. linear)
2095 if (mddev->level > 0)
2098 mddev->dev_sectors = rdev->sectors;
2101 /* Verify rdev->desc_nr is unique.
2102 * If it is -1, assign a free number, else
2103 * check number is not in use
2105 if (rdev->desc_nr < 0) {
2107 if (mddev->pers) choice = mddev->raid_disks;
2108 while (find_rdev_nr(mddev, choice))
2110 rdev->desc_nr = choice;
2112 if (find_rdev_nr(mddev, rdev->desc_nr))
2115 if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) {
2116 printk(KERN_WARNING "md: %s: array is limited to %d devices\n",
2117 mdname(mddev), mddev->max_disks);
2120 bdevname(rdev->bdev,b);
2121 while ( (s=strchr(b, '/')) != NULL)
2124 rdev->mddev = mddev;
2125 printk(KERN_INFO "md: bind<%s>\n", b);
2127 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
2130 ko = &part_to_dev(rdev->bdev->bd_part)->kobj;
2131 if (sysfs_create_link(&rdev->kobj, ko, "block"))
2132 /* failure here is OK */;
2133 rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state");
2135 list_add_rcu(&rdev->same_set, &mddev->disks);
2136 bd_link_disk_holder(rdev->bdev, mddev->gendisk);
2138 /* May as well allow recovery to be retried once */
2139 mddev->recovery_disabled++;
2144 printk(KERN_WARNING "md: failed to register dev-%s for %s\n",
2149 static void md_delayed_delete(struct work_struct *ws)
2151 struct md_rdev *rdev = container_of(ws, struct md_rdev, del_work);
2152 kobject_del(&rdev->kobj);
2153 kobject_put(&rdev->kobj);
2156 static void unbind_rdev_from_array(struct md_rdev * rdev)
2158 char b[BDEVNAME_SIZE];
2163 bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk);
2164 list_del_rcu(&rdev->same_set);
2165 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
2167 sysfs_remove_link(&rdev->kobj, "block");
2168 sysfs_put(rdev->sysfs_state);
2169 rdev->sysfs_state = NULL;
2170 rdev->badblocks.count = 0;
2171 /* We need to delay this, otherwise we can deadlock when
2172 * writing to 'remove' to "dev/state". We also need
2173 * to delay it due to rcu usage.
2176 INIT_WORK(&rdev->del_work, md_delayed_delete);
2177 kobject_get(&rdev->kobj);
2178 queue_work(md_misc_wq, &rdev->del_work);
2182 * prevent the device from being mounted, repartitioned or
2183 * otherwise reused by a RAID array (or any other kernel
2184 * subsystem), by bd_claiming the device.
2186 static int lock_rdev(struct md_rdev *rdev, dev_t dev, int shared)
2189 struct block_device *bdev;
2190 char b[BDEVNAME_SIZE];
2192 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
2193 shared ? (struct md_rdev *)lock_rdev : rdev);
2195 printk(KERN_ERR "md: could not open %s.\n",
2196 __bdevname(dev, b));
2197 return PTR_ERR(bdev);
2203 static void unlock_rdev(struct md_rdev *rdev)
2205 struct block_device *bdev = rdev->bdev;
2209 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
2212 void md_autodetect_dev(dev_t dev);
2214 static void export_rdev(struct md_rdev * rdev)
2216 char b[BDEVNAME_SIZE];
2217 printk(KERN_INFO "md: export_rdev(%s)\n",
2218 bdevname(rdev->bdev,b));
2221 md_rdev_clear(rdev);
2223 if (test_bit(AutoDetected, &rdev->flags))
2224 md_autodetect_dev(rdev->bdev->bd_dev);
2227 kobject_put(&rdev->kobj);
2230 static void kick_rdev_from_array(struct md_rdev * rdev)
2232 unbind_rdev_from_array(rdev);
2236 static void export_array(struct mddev *mddev)
2238 struct md_rdev *rdev, *tmp;
2240 rdev_for_each_safe(rdev, tmp, mddev) {
2245 kick_rdev_from_array(rdev);
2247 if (!list_empty(&mddev->disks))
2249 mddev->raid_disks = 0;
2250 mddev->major_version = 0;
2253 static void print_desc(mdp_disk_t *desc)
2255 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
2256 desc->major,desc->minor,desc->raid_disk,desc->state);
2259 static void print_sb_90(mdp_super_t *sb)
2264 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
2265 sb->major_version, sb->minor_version, sb->patch_version,
2266 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
2268 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
2269 sb->level, sb->size, sb->nr_disks, sb->raid_disks,
2270 sb->md_minor, sb->layout, sb->chunk_size);
2271 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
2272 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
2273 sb->utime, sb->state, sb->active_disks, sb->working_disks,
2274 sb->failed_disks, sb->spare_disks,
2275 sb->sb_csum, (unsigned long)sb->events_lo);
2278 for (i = 0; i < MD_SB_DISKS; i++) {
2281 desc = sb->disks + i;
2282 if (desc->number || desc->major || desc->minor ||
2283 desc->raid_disk || (desc->state && (desc->state != 4))) {
2284 printk(" D %2d: ", i);
2288 printk(KERN_INFO "md: THIS: ");
2289 print_desc(&sb->this_disk);
2292 static void print_sb_1(struct mdp_superblock_1 *sb)
2296 uuid = sb->set_uuid;
2298 "md: SB: (V:%u) (F:0x%08x) Array-ID:<%pU>\n"
2299 "md: Name: \"%s\" CT:%llu\n",
2300 le32_to_cpu(sb->major_version),
2301 le32_to_cpu(sb->feature_map),
2304 (unsigned long long)le64_to_cpu(sb->ctime)
2305 & MD_SUPERBLOCK_1_TIME_SEC_MASK);
2307 uuid = sb->device_uuid;
2309 "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu"
2311 "md: Dev:%08x UUID: %pU\n"
2312 "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n"
2313 "md: (MaxDev:%u) \n",
2314 le32_to_cpu(sb->level),
2315 (unsigned long long)le64_to_cpu(sb->size),
2316 le32_to_cpu(sb->raid_disks),
2317 le32_to_cpu(sb->layout),
2318 le32_to_cpu(sb->chunksize),
2319 (unsigned long long)le64_to_cpu(sb->data_offset),
2320 (unsigned long long)le64_to_cpu(sb->data_size),
2321 (unsigned long long)le64_to_cpu(sb->super_offset),
2322 (unsigned long long)le64_to_cpu(sb->recovery_offset),
2323 le32_to_cpu(sb->dev_number),
2326 (unsigned long long)le64_to_cpu(sb->utime) & MD_SUPERBLOCK_1_TIME_SEC_MASK,
2327 (unsigned long long)le64_to_cpu(sb->events),
2328 (unsigned long long)le64_to_cpu(sb->resync_offset),
2329 le32_to_cpu(sb->sb_csum),
2330 le32_to_cpu(sb->max_dev)
2334 static void print_rdev(struct md_rdev *rdev, int major_version)
2336 char b[BDEVNAME_SIZE];
2337 printk(KERN_INFO "md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n",
2338 bdevname(rdev->bdev, b), (unsigned long long)rdev->sectors,
2339 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
2341 if (rdev->sb_loaded) {
2342 printk(KERN_INFO "md: rdev superblock (MJ:%d):\n", major_version);
2343 switch (major_version) {
2345 print_sb_90(page_address(rdev->sb_page));
2348 print_sb_1(page_address(rdev->sb_page));
2352 printk(KERN_INFO "md: no rdev superblock!\n");
2355 static void md_print_devices(void)
2357 struct list_head *tmp;
2358 struct md_rdev *rdev;
2359 struct mddev *mddev;
2360 char b[BDEVNAME_SIZE];
2363 printk("md: **********************************\n");
2364 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
2365 printk("md: **********************************\n");
2366 for_each_mddev(mddev, tmp) {
2369 bitmap_print_sb(mddev->bitmap);
2371 printk("%s: ", mdname(mddev));
2372 rdev_for_each(rdev, mddev)
2373 printk("<%s>", bdevname(rdev->bdev,b));
2376 rdev_for_each(rdev, mddev)
2377 print_rdev(rdev, mddev->major_version);
2379 printk("md: **********************************\n");
2384 static void sync_sbs(struct mddev * mddev, int nospares)
2386 /* Update each superblock (in-memory image), but
2387 * if we are allowed to, skip spares which already
2388 * have the right event counter, or have one earlier
2389 * (which would mean they aren't being marked as dirty
2390 * with the rest of the array)
2392 struct md_rdev *rdev;
2393 rdev_for_each(rdev, mddev) {
2394 if (rdev->sb_events == mddev->events ||
2396 rdev->raid_disk < 0 &&
2397 rdev->sb_events+1 == mddev->events)) {
2398 /* Don't update this superblock */
2399 rdev->sb_loaded = 2;
2401 sync_super(mddev, rdev);
2402 rdev->sb_loaded = 1;
2407 static void md_update_sb(struct mddev * mddev, int force_change)
2409 struct md_rdev *rdev;
2412 int any_badblocks_changed = 0;
2415 /* First make sure individual recovery_offsets are correct */
2416 rdev_for_each(rdev, mddev) {
2417 if (rdev->raid_disk >= 0 &&
2418 mddev->delta_disks >= 0 &&
2419 !test_bit(In_sync, &rdev->flags) &&
2420 mddev->curr_resync_completed > rdev->recovery_offset)
2421 rdev->recovery_offset = mddev->curr_resync_completed;
2424 if (!mddev->persistent) {
2425 clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
2426 clear_bit(MD_CHANGE_DEVS, &mddev->flags);
2427 if (!mddev->external) {
2428 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2429 rdev_for_each(rdev, mddev) {
2430 if (rdev->badblocks.changed) {
2431 rdev->badblocks.changed = 0;
2432 md_ack_all_badblocks(&rdev->badblocks);
2433 md_error(mddev, rdev);
2435 clear_bit(Blocked, &rdev->flags);
2436 clear_bit(BlockedBadBlocks, &rdev->flags);
2437 wake_up(&rdev->blocked_wait);
2440 wake_up(&mddev->sb_wait);
2444 spin_lock_irq(&mddev->write_lock);
2446 mddev->utime = get_seconds();
2448 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
2450 if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags))
2451 /* just a clean<-> dirty transition, possibly leave spares alone,
2452 * though if events isn't the right even/odd, we will have to do
2458 if (mddev->degraded)
2459 /* If the array is degraded, then skipping spares is both
2460 * dangerous and fairly pointless.
2461 * Dangerous because a device that was removed from the array
2462 * might have a event_count that still looks up-to-date,
2463 * so it can be re-added without a resync.
2464 * Pointless because if there are any spares to skip,
2465 * then a recovery will happen and soon that array won't
2466 * be degraded any more and the spare can go back to sleep then.
2470 sync_req = mddev->in_sync;
2472 /* If this is just a dirty<->clean transition, and the array is clean
2473 * and 'events' is odd, we can roll back to the previous clean state */
2475 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
2476 && mddev->can_decrease_events
2477 && mddev->events != 1) {
2479 mddev->can_decrease_events = 0;
2481 /* otherwise we have to go forward and ... */
2483 mddev->can_decrease_events = nospares;
2486 if (!mddev->events) {
2488 * oops, this 64-bit counter should never wrap.
2489 * Either we are in around ~1 trillion A.C., assuming
2490 * 1 reboot per second, or we have a bug:
2496 rdev_for_each(rdev, mddev) {
2497 if (rdev->badblocks.changed)
2498 any_badblocks_changed++;
2499 if (test_bit(Faulty, &rdev->flags))
2500 set_bit(FaultRecorded, &rdev->flags);
2503 sync_sbs(mddev, nospares);
2504 spin_unlock_irq(&mddev->write_lock);
2506 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2507 mdname(mddev), mddev->in_sync);
2509 bitmap_update_sb(mddev->bitmap);
2510 rdev_for_each(rdev, mddev) {
2511 char b[BDEVNAME_SIZE];
2513 if (rdev->sb_loaded != 1)
2514 continue; /* no noise on spare devices */
2516 if (!test_bit(Faulty, &rdev->flags) &&
2517 rdev->saved_raid_disk == -1) {
2518 md_super_write(mddev,rdev,
2519 rdev->sb_start, rdev->sb_size,
2521 pr_debug("md: (write) %s's sb offset: %llu\n",
2522 bdevname(rdev->bdev, b),
2523 (unsigned long long)rdev->sb_start);
2524 rdev->sb_events = mddev->events;
2525 if (rdev->badblocks.size) {
2526 md_super_write(mddev, rdev,
2527 rdev->badblocks.sector,
2528 rdev->badblocks.size << 9,
2530 rdev->badblocks.size = 0;
2533 } else if (test_bit(Faulty, &rdev->flags))
2534 pr_debug("md: %s (skipping faulty)\n",
2535 bdevname(rdev->bdev, b));
2537 pr_debug("(skipping incremental s/r ");
2539 if (mddev->level == LEVEL_MULTIPATH)
2540 /* only need to write one superblock... */
2543 md_super_wait(mddev);
2544 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2546 spin_lock_irq(&mddev->write_lock);
2547 if (mddev->in_sync != sync_req ||
2548 test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
2549 /* have to write it out again */
2550 spin_unlock_irq(&mddev->write_lock);
2553 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2554 spin_unlock_irq(&mddev->write_lock);
2555 wake_up(&mddev->sb_wait);
2556 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
2557 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
2559 rdev_for_each(rdev, mddev) {
2560 if (test_and_clear_bit(FaultRecorded, &rdev->flags))
2561 clear_bit(Blocked, &rdev->flags);
2563 if (any_badblocks_changed)
2564 md_ack_all_badblocks(&rdev->badblocks);
2565 clear_bit(BlockedBadBlocks, &rdev->flags);
2566 wake_up(&rdev->blocked_wait);
2570 /* words written to sysfs files may, or may not, be \n terminated.
2571 * We want to accept with case. For this we use cmd_match.
2573 static int cmd_match(const char *cmd, const char *str)
2575 /* See if cmd, written into a sysfs file, matches
2576 * str. They must either be the same, or cmd can
2577 * have a trailing newline
2579 while (*cmd && *str && *cmd == *str) {
2590 struct rdev_sysfs_entry {
2591 struct attribute attr;
2592 ssize_t (*show)(struct md_rdev *, char *);
2593 ssize_t (*store)(struct md_rdev *, const char *, size_t);
2597 state_show(struct md_rdev *rdev, char *page)
2602 if (test_bit(Faulty, &rdev->flags) ||
2603 rdev->badblocks.unacked_exist) {
2604 len+= sprintf(page+len, "%sfaulty",sep);
2607 if (test_bit(In_sync, &rdev->flags)) {
2608 len += sprintf(page+len, "%sin_sync",sep);
2611 if (test_bit(WriteMostly, &rdev->flags)) {
2612 len += sprintf(page+len, "%swrite_mostly",sep);
2615 if (test_bit(Blocked, &rdev->flags) ||
2616 (rdev->badblocks.unacked_exist
2617 && !test_bit(Faulty, &rdev->flags))) {
2618 len += sprintf(page+len, "%sblocked", sep);
2621 if (!test_bit(Faulty, &rdev->flags) &&
2622 !test_bit(In_sync, &rdev->flags)) {
2623 len += sprintf(page+len, "%sspare", sep);
2626 if (test_bit(WriteErrorSeen, &rdev->flags)) {
2627 len += sprintf(page+len, "%swrite_error", sep);
2630 if (test_bit(WantReplacement, &rdev->flags)) {
2631 len += sprintf(page+len, "%swant_replacement", sep);
2634 if (test_bit(Replacement, &rdev->flags)) {
2635 len += sprintf(page+len, "%sreplacement", sep);
2639 return len+sprintf(page+len, "\n");
2643 state_store(struct md_rdev *rdev, const char *buf, size_t len)
2646 * faulty - simulates an error
2647 * remove - disconnects the device
2648 * writemostly - sets write_mostly
2649 * -writemostly - clears write_mostly
2650 * blocked - sets the Blocked flags
2651 * -blocked - clears the Blocked and possibly simulates an error
2652 * insync - sets Insync providing device isn't active
2653 * write_error - sets WriteErrorSeen
2654 * -write_error - clears WriteErrorSeen
2657 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
2658 md_error(rdev->mddev, rdev);
2659 if (test_bit(Faulty, &rdev->flags))
2663 } else if (cmd_match(buf, "remove")) {
2664 if (rdev->raid_disk >= 0)
2667 struct mddev *mddev = rdev->mddev;
2668 kick_rdev_from_array(rdev);
2670 md_update_sb(mddev, 1);
2671 md_new_event(mddev);
2674 } else if (cmd_match(buf, "writemostly")) {
2675 set_bit(WriteMostly, &rdev->flags);
2677 } else if (cmd_match(buf, "-writemostly")) {
2678 clear_bit(WriteMostly, &rdev->flags);
2680 } else if (cmd_match(buf, "blocked")) {
2681 set_bit(Blocked, &rdev->flags);
2683 } else if (cmd_match(buf, "-blocked")) {
2684 if (!test_bit(Faulty, &rdev->flags) &&
2685 rdev->badblocks.unacked_exist) {
2686 /* metadata handler doesn't understand badblocks,
2687 * so we need to fail the device
2689 md_error(rdev->mddev, rdev);
2691 clear_bit(Blocked, &rdev->flags);
2692 clear_bit(BlockedBadBlocks, &rdev->flags);
2693 wake_up(&rdev->blocked_wait);
2694 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2695 md_wakeup_thread(rdev->mddev->thread);
2698 } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) {
2699 set_bit(In_sync, &rdev->flags);
2701 } else if (cmd_match(buf, "write_error")) {
2702 set_bit(WriteErrorSeen, &rdev->flags);
2704 } else if (cmd_match(buf, "-write_error")) {
2705 clear_bit(WriteErrorSeen, &rdev->flags);
2707 } else if (cmd_match(buf, "want_replacement")) {
2708 /* Any non-spare device that is not a replacement can
2709 * become want_replacement at any time, but we then need to
2710 * check if recovery is needed.
2712 if (rdev->raid_disk >= 0 &&
2713 !test_bit(Replacement, &rdev->flags))
2714 set_bit(WantReplacement, &rdev->flags);
2715 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2716 md_wakeup_thread(rdev->mddev->thread);
2718 } else if (cmd_match(buf, "-want_replacement")) {
2719 /* Clearing 'want_replacement' is always allowed.
2720 * Once replacements starts it is too late though.
2723 clear_bit(WantReplacement, &rdev->flags);
2724 } else if (cmd_match(buf, "replacement")) {
2725 /* Can only set a device as a replacement when array has not
2726 * yet been started. Once running, replacement is automatic
2727 * from spares, or by assigning 'slot'.
2729 if (rdev->mddev->pers)
2732 set_bit(Replacement, &rdev->flags);
2735 } else if (cmd_match(buf, "-replacement")) {
2736 /* Similarly, can only clear Replacement before start */
2737 if (rdev->mddev->pers)
2740 clear_bit(Replacement, &rdev->flags);
2745 sysfs_notify_dirent_safe(rdev->sysfs_state);
2746 return err ? err : len;
2748 static struct rdev_sysfs_entry rdev_state =
2749 __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store);
2752 errors_show(struct md_rdev *rdev, char *page)
2754 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
2758 errors_store(struct md_rdev *rdev, const char *buf, size_t len)
2761 unsigned long n = simple_strtoul(buf, &e, 10);
2762 if (*buf && (*e == 0 || *e == '\n')) {
2763 atomic_set(&rdev->corrected_errors, n);
2768 static struct rdev_sysfs_entry rdev_errors =
2769 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
2772 slot_show(struct md_rdev *rdev, char *page)
2774 if (rdev->raid_disk < 0)
2775 return sprintf(page, "none\n");
2777 return sprintf(page, "%d\n", rdev->raid_disk);
2781 slot_store(struct md_rdev *rdev, const char *buf, size_t len)
2785 int slot = simple_strtoul(buf, &e, 10);
2786 if (strncmp(buf, "none", 4)==0)
2788 else if (e==buf || (*e && *e!= '\n'))
2790 if (rdev->mddev->pers && slot == -1) {
2791 /* Setting 'slot' on an active array requires also
2792 * updating the 'rd%d' link, and communicating
2793 * with the personality with ->hot_*_disk.
2794 * For now we only support removing
2795 * failed/spare devices. This normally happens automatically,
2796 * but not when the metadata is externally managed.
2798 if (rdev->raid_disk == -1)
2800 /* personality does all needed checks */
2801 if (rdev->mddev->pers->hot_remove_disk == NULL)
2803 err = rdev->mddev->pers->
2804 hot_remove_disk(rdev->mddev, rdev);
2807 sysfs_unlink_rdev(rdev->mddev, rdev);
2808 rdev->raid_disk = -1;
2809 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2810 md_wakeup_thread(rdev->mddev->thread);
2811 } else if (rdev->mddev->pers) {
2812 /* Activating a spare .. or possibly reactivating
2813 * if we ever get bitmaps working here.
2816 if (rdev->raid_disk != -1)
2819 if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery))
2822 if (rdev->mddev->pers->hot_add_disk == NULL)
2825 if (slot >= rdev->mddev->raid_disks &&
2826 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
2829 rdev->raid_disk = slot;
2830 if (test_bit(In_sync, &rdev->flags))
2831 rdev->saved_raid_disk = slot;
2833 rdev->saved_raid_disk = -1;
2834 clear_bit(In_sync, &rdev->flags);
2835 err = rdev->mddev->pers->
2836 hot_add_disk(rdev->mddev, rdev);
2838 rdev->raid_disk = -1;
2841 sysfs_notify_dirent_safe(rdev->sysfs_state);
2842 if (sysfs_link_rdev(rdev->mddev, rdev))
2843 /* failure here is OK */;
2844 /* don't wakeup anyone, leave that to userspace. */
2846 if (slot >= rdev->mddev->raid_disks &&
2847 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
2849 rdev->raid_disk = slot;
2850 /* assume it is working */
2851 clear_bit(Faulty, &rdev->flags);
2852 clear_bit(WriteMostly, &rdev->flags);
2853 set_bit(In_sync, &rdev->flags);
2854 sysfs_notify_dirent_safe(rdev->sysfs_state);
2860 static struct rdev_sysfs_entry rdev_slot =
2861 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
2864 offset_show(struct md_rdev *rdev, char *page)
2866 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
2870 offset_store(struct md_rdev *rdev, const char *buf, size_t len)
2872 unsigned long long offset;
2873 if (strict_strtoull(buf, 10, &offset) < 0)
2875 if (rdev->mddev->pers && rdev->raid_disk >= 0)
2877 if (rdev->sectors && rdev->mddev->external)
2878 /* Must set offset before size, so overlap checks
2881 rdev->data_offset = offset;
2882 rdev->new_data_offset = offset;
2886 static struct rdev_sysfs_entry rdev_offset =
2887 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
2889 static ssize_t new_offset_show(struct md_rdev *rdev, char *page)
2891 return sprintf(page, "%llu\n",
2892 (unsigned long long)rdev->new_data_offset);
2895 static ssize_t new_offset_store(struct md_rdev *rdev,
2896 const char *buf, size_t len)
2898 unsigned long long new_offset;
2899 struct mddev *mddev = rdev->mddev;
2901 if (strict_strtoull(buf, 10, &new_offset) < 0)
2904 if (mddev->sync_thread)
2906 if (new_offset == rdev->data_offset)
2907 /* reset is always permitted */
2909 else if (new_offset > rdev->data_offset) {
2910 /* must not push array size beyond rdev_sectors */
2911 if (new_offset - rdev->data_offset
2912 + mddev->dev_sectors > rdev->sectors)
2915 /* Metadata worries about other space details. */
2917 /* decreasing the offset is inconsistent with a backwards
2920 if (new_offset < rdev->data_offset &&
2921 mddev->reshape_backwards)
2923 /* Increasing offset is inconsistent with forwards
2924 * reshape. reshape_direction should be set to
2925 * 'backwards' first.
2927 if (new_offset > rdev->data_offset &&
2928 !mddev->reshape_backwards)
2931 if (mddev->pers && mddev->persistent &&
2932 !super_types[mddev->major_version]
2933 .allow_new_offset(rdev, new_offset))
2935 rdev->new_data_offset = new_offset;
2936 if (new_offset > rdev->data_offset)
2937 mddev->reshape_backwards = 1;
2938 else if (new_offset < rdev->data_offset)
2939 mddev->reshape_backwards = 0;
2943 static struct rdev_sysfs_entry rdev_new_offset =
2944 __ATTR(new_offset, S_IRUGO|S_IWUSR, new_offset_show, new_offset_store);
2947 rdev_size_show(struct md_rdev *rdev, char *page)
2949 return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2);
2952 static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
2954 /* check if two start/length pairs overlap */
2962 static int strict_blocks_to_sectors(const char *buf, sector_t *sectors)
2964 unsigned long long blocks;
2967 if (strict_strtoull(buf, 10, &blocks) < 0)
2970 if (blocks & 1ULL << (8 * sizeof(blocks) - 1))
2971 return -EINVAL; /* sector conversion overflow */
2974 if (new != blocks * 2)
2975 return -EINVAL; /* unsigned long long to sector_t overflow */
2982 rdev_size_store(struct md_rdev *rdev, const char *buf, size_t len)
2984 struct mddev *my_mddev = rdev->mddev;
2985 sector_t oldsectors = rdev->sectors;
2988 if (strict_blocks_to_sectors(buf, §ors) < 0)
2990 if (rdev->data_offset != rdev->new_data_offset)
2991 return -EINVAL; /* too confusing */
2992 if (my_mddev->pers && rdev->raid_disk >= 0) {
2993 if (my_mddev->persistent) {
2994 sectors = super_types[my_mddev->major_version].
2995 rdev_size_change(rdev, sectors);
2998 } else if (!sectors)
2999 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) -
3002 if (sectors < my_mddev->dev_sectors)
3003 return -EINVAL; /* component must fit device */
3005 rdev->sectors = sectors;
3006 if (sectors > oldsectors && my_mddev->external) {
3007 /* need to check that all other rdevs with the same ->bdev
3008 * do not overlap. We need to unlock the mddev to avoid
3009 * a deadlock. We have already changed rdev->sectors, and if
3010 * we have to change it back, we will have the lock again.
3012 struct mddev *mddev;
3014 struct list_head *tmp;
3016 mddev_unlock(my_mddev);
3017 for_each_mddev(mddev, tmp) {
3018 struct md_rdev *rdev2;
3021 rdev_for_each(rdev2, mddev)
3022 if (rdev->bdev == rdev2->bdev &&
3024 overlaps(rdev->data_offset, rdev->sectors,
3030 mddev_unlock(mddev);
3036 mddev_lock(my_mddev);
3038 /* Someone else could have slipped in a size
3039 * change here, but doing so is just silly.
3040 * We put oldsectors back because we *know* it is
3041 * safe, and trust userspace not to race with
3044 rdev->sectors = oldsectors;
3051 static struct rdev_sysfs_entry rdev_size =
3052 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
3055 static ssize_t recovery_start_show(struct md_rdev *rdev, char *page)
3057 unsigned long long recovery_start = rdev->recovery_offset;
3059 if (test_bit(In_sync, &rdev->flags) ||
3060 recovery_start == MaxSector)
3061 return sprintf(page, "none\n");
3063 return sprintf(page, "%llu\n", recovery_start);
3066 static ssize_t recovery_start_store(struct md_rdev *rdev, const char *buf, size_t len)
3068 unsigned long long recovery_start;
3070 if (cmd_match(buf, "none"))
3071 recovery_start = MaxSector;
3072 else if (strict_strtoull(buf, 10, &recovery_start))
3075 if (rdev->mddev->pers &&
3076 rdev->raid_disk >= 0)
3079 rdev->recovery_offset = recovery_start;
3080 if (recovery_start == MaxSector)
3081 set_bit(In_sync, &rdev->flags);
3083 clear_bit(In_sync, &rdev->flags);
3087 static struct rdev_sysfs_entry rdev_recovery_start =
3088 __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store);
3092 badblocks_show(struct badblocks *bb, char *page, int unack);
3094 badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack);
3096 static ssize_t bb_show(struct md_rdev *rdev, char *page)
3098 return badblocks_show(&rdev->badblocks, page, 0);
3100 static ssize_t bb_store(struct md_rdev *rdev, const char *page, size_t len)
3102 int rv = badblocks_store(&rdev->badblocks, page, len, 0);
3103 /* Maybe that ack was all we needed */
3104 if (test_and_clear_bit(BlockedBadBlocks, &rdev->flags))
3105 wake_up(&rdev->blocked_wait);
3108 static struct rdev_sysfs_entry rdev_bad_blocks =
3109 __ATTR(bad_blocks, S_IRUGO|S_IWUSR, bb_show, bb_store);
3112 static ssize_t ubb_show(struct md_rdev *rdev, char *page)
3114 return badblocks_show(&rdev->badblocks, page, 1);
3116 static ssize_t ubb_store(struct md_rdev *rdev, const char *page, size_t len)
3118 return badblocks_store(&rdev->badblocks, page, len, 1);
3120 static struct rdev_sysfs_entry rdev_unack_bad_blocks =
3121 __ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store);
3123 static struct attribute *rdev_default_attrs[] = {
3128 &rdev_new_offset.attr,
3130 &rdev_recovery_start.attr,
3131 &rdev_bad_blocks.attr,
3132 &rdev_unack_bad_blocks.attr,
3136 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
3138 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3139 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3140 struct mddev *mddev = rdev->mddev;
3146 rv = mddev ? mddev_lock(mddev) : -EBUSY;
3148 if (rdev->mddev == NULL)
3151 rv = entry->show(rdev, page);
3152 mddev_unlock(mddev);
3158 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
3159 const char *page, size_t length)
3161 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3162 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3164 struct mddev *mddev = rdev->mddev;
3168 if (!capable(CAP_SYS_ADMIN))
3170 rv = mddev ? mddev_lock(mddev): -EBUSY;
3172 if (rdev->mddev == NULL)
3175 rv = entry->store(rdev, page, length);
3176 mddev_unlock(mddev);
3181 static void rdev_free(struct kobject *ko)
3183 struct md_rdev *rdev = container_of(ko, struct md_rdev, kobj);
3186 static const struct sysfs_ops rdev_sysfs_ops = {
3187 .show = rdev_attr_show,
3188 .store = rdev_attr_store,
3190 static struct kobj_type rdev_ktype = {
3191 .release = rdev_free,
3192 .sysfs_ops = &rdev_sysfs_ops,
3193 .default_attrs = rdev_default_attrs,
3196 int md_rdev_init(struct md_rdev *rdev)
3199 rdev->saved_raid_disk = -1;
3200 rdev->raid_disk = -1;
3202 rdev->data_offset = 0;
3203 rdev->new_data_offset = 0;
3204 rdev->sb_events = 0;
3205 rdev->last_read_error.tv_sec = 0;
3206 rdev->last_read_error.tv_nsec = 0;
3207 rdev->sb_loaded = 0;
3208 rdev->bb_page = NULL;
3209 atomic_set(&rdev->nr_pending, 0);
3210 atomic_set(&rdev->read_errors, 0);
3211 atomic_set(&rdev->corrected_errors, 0);
3213 INIT_LIST_HEAD(&rdev->same_set);
3214 init_waitqueue_head(&rdev->blocked_wait);
3216 /* Add space to store bad block list.
3217 * This reserves the space even on arrays where it cannot
3218 * be used - I wonder if that matters
3220 rdev->badblocks.count = 0;
3221 rdev->badblocks.shift = 0;
3222 rdev->badblocks.page = kmalloc(PAGE_SIZE, GFP_KERNEL);
3223 seqlock_init(&rdev->badblocks.lock);
3224 if (rdev->badblocks.page == NULL)
3229 EXPORT_SYMBOL_GPL(md_rdev_init);
3231 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3233 * mark the device faulty if:
3235 * - the device is nonexistent (zero size)
3236 * - the device has no valid superblock
3238 * a faulty rdev _never_ has rdev->sb set.
3240 static struct md_rdev *md_import_device(dev_t newdev, int super_format, int super_minor)
3242 char b[BDEVNAME_SIZE];
3244 struct md_rdev *rdev;
3247 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
3249 printk(KERN_ERR "md: could not alloc mem for new device!\n");
3250 return ERR_PTR(-ENOMEM);
3253 err = md_rdev_init(rdev);
3256 err = alloc_disk_sb(rdev);
3260 err = lock_rdev(rdev, newdev, super_format == -2);
3264 kobject_init(&rdev->kobj, &rdev_ktype);
3266 size = i_size_read(rdev->bdev->bd_inode) >> BLOCK_SIZE_BITS;
3269 "md: %s has zero or unknown size, marking faulty!\n",
3270 bdevname(rdev->bdev,b));
3275 if (super_format >= 0) {
3276 err = super_types[super_format].
3277 load_super(rdev, NULL, super_minor);
3278 if (err == -EINVAL) {
3280 "md: %s does not have a valid v%d.%d "
3281 "superblock, not importing!\n",
3282 bdevname(rdev->bdev,b),
3283 super_format, super_minor);
3288 "md: could not read %s's sb, not importing!\n",
3289 bdevname(rdev->bdev,b));
3293 if (super_format == -1)
3294 /* hot-add for 0.90, or non-persistent: so no badblocks */
3295 rdev->badblocks.shift = -1;
3302 md_rdev_clear(rdev);
3304 return ERR_PTR(err);
3308 * Check a full RAID array for plausibility
3312 static void analyze_sbs(struct mddev * mddev)
3315 struct md_rdev *rdev, *freshest, *tmp;
3316 char b[BDEVNAME_SIZE];
3319 rdev_for_each_safe(rdev, tmp, mddev)
3320 switch (super_types[mddev->major_version].
3321 load_super(rdev, freshest, mddev->minor_version)) {
3329 "md: fatal superblock inconsistency in %s"
3330 " -- removing from array\n",
3331 bdevname(rdev->bdev,b));
3332 kick_rdev_from_array(rdev);
3336 super_types[mddev->major_version].
3337 validate_super(mddev, freshest);
3340 rdev_for_each_safe(rdev, tmp, mddev) {
3341 if (mddev->max_disks &&
3342 (rdev->desc_nr >= mddev->max_disks ||
3343 i > mddev->max_disks)) {
3345 "md: %s: %s: only %d devices permitted\n",
3346 mdname(mddev), bdevname(rdev->bdev, b),
3348 kick_rdev_from_array(rdev);
3351 if (rdev != freshest)
3352 if (super_types[mddev->major_version].
3353 validate_super(mddev, rdev)) {
3354 printk(KERN_WARNING "md: kicking non-fresh %s"
3356 bdevname(rdev->bdev,b));
3357 kick_rdev_from_array(rdev);
3360 if (mddev->level == LEVEL_MULTIPATH) {
3361 rdev->desc_nr = i++;
3362 rdev->raid_disk = rdev->desc_nr;
3363 set_bit(In_sync, &rdev->flags);
3364 } else if (rdev->raid_disk >= (mddev->raid_disks - min(0, mddev->delta_disks))) {
3365 rdev->raid_disk = -1;
3366 clear_bit(In_sync, &rdev->flags);
3371 /* Read a fixed-point number.
3372 * Numbers in sysfs attributes should be in "standard" units where
3373 * possible, so time should be in seconds.
3374 * However we internally use a a much smaller unit such as
3375 * milliseconds or jiffies.
3376 * This function takes a decimal number with a possible fractional
3377 * component, and produces an integer which is the result of
3378 * multiplying that number by 10^'scale'.
3379 * all without any floating-point arithmetic.
3381 int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale)
3383 unsigned long result = 0;
3385 while (isdigit(*cp) || (*cp == '.' && decimals < 0)) {
3388 else if (decimals < scale) {
3391 result = result * 10 + value;
3403 while (decimals < scale) {
3412 static void md_safemode_timeout(unsigned long data);
3415 safe_delay_show(struct mddev *mddev, char *page)
3417 int msec = (mddev->safemode_delay*1000)/HZ;
3418 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
3421 safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len)
3425 if (strict_strtoul_scaled(cbuf, &msec, 3) < 0)
3428 mddev->safemode_delay = 0;
3430 unsigned long old_delay = mddev->safemode_delay;
3431 mddev->safemode_delay = (msec*HZ)/1000;
3432 if (mddev->safemode_delay == 0)
3433 mddev->safemode_delay = 1;
3434 if (mddev->safemode_delay < old_delay)
3435 md_safemode_timeout((unsigned long)mddev);
3439 static struct md_sysfs_entry md_safe_delay =
3440 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
3443 level_show(struct mddev *mddev, char *page)
3445 struct md_personality *p = mddev->pers;
3447 return sprintf(page, "%s\n", p->name);
3448 else if (mddev->clevel[0])
3449 return sprintf(page, "%s\n", mddev->clevel);
3450 else if (mddev->level != LEVEL_NONE)
3451 return sprintf(page, "%d\n", mddev->level);
3457 level_store(struct mddev *mddev, const char *buf, size_t len)
3461 struct md_personality *pers;
3464 struct md_rdev *rdev;
3466 if (mddev->pers == NULL) {
3469 if (len >= sizeof(mddev->clevel))
3471 strncpy(mddev->clevel, buf, len);
3472 if (mddev->clevel[len-1] == '\n')
3474 mddev->clevel[len] = 0;
3475 mddev->level = LEVEL_NONE;
3479 /* request to change the personality. Need to ensure:
3480 * - array is not engaged in resync/recovery/reshape
3481 * - old personality can be suspended
3482 * - new personality will access other array.
3485 if (mddev->sync_thread ||
3486 mddev->reshape_position != MaxSector ||
3487 mddev->sysfs_active)
3490 if (!mddev->pers->quiesce) {
3491 printk(KERN_WARNING "md: %s: %s does not support online personality change\n",
3492 mdname(mddev), mddev->pers->name);
3496 /* Now find the new personality */
3497 if (len == 0 || len >= sizeof(clevel))
3499 strncpy(clevel, buf, len);
3500 if (clevel[len-1] == '\n')
3503 if (strict_strtol(clevel, 10, &level))
3506 if (request_module("md-%s", clevel) != 0)
3507 request_module("md-level-%s", clevel);
3508 spin_lock(&pers_lock);
3509 pers = find_pers(level, clevel);
3510 if (!pers || !try_module_get(pers->owner)) {
3511 spin_unlock(&pers_lock);
3512 printk(KERN_WARNING "md: personality %s not loaded\n", clevel);
3515 spin_unlock(&pers_lock);
3517 if (pers == mddev->pers) {
3518 /* Nothing to do! */
3519 module_put(pers->owner);
3522 if (!pers->takeover) {
3523 module_put(pers->owner);
3524 printk(KERN_WARNING "md: %s: %s does not support personality takeover\n",
3525 mdname(mddev), clevel);
3529 rdev_for_each(rdev, mddev)
3530 rdev->new_raid_disk = rdev->raid_disk;
3532 /* ->takeover must set new_* and/or delta_disks
3533 * if it succeeds, and may set them when it fails.
3535 priv = pers->takeover(mddev);
3537 mddev->new_level = mddev->level;
3538 mddev->new_layout = mddev->layout;
3539 mddev->new_chunk_sectors = mddev->chunk_sectors;
3540 mddev->raid_disks -= mddev->delta_disks;
3541 mddev->delta_disks = 0;
3542 mddev->reshape_backwards = 0;
3543 module_put(pers->owner);
3544 printk(KERN_WARNING "md: %s: %s would not accept array\n",
3545 mdname(mddev), clevel);
3546 return PTR_ERR(priv);
3549 /* Looks like we have a winner */
3550 mddev_suspend(mddev);
3551 mddev->pers->stop(mddev);
3553 if (mddev->pers->sync_request == NULL &&
3554 pers->sync_request != NULL) {
3555 /* need to add the md_redundancy_group */
3556 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
3558 "md: cannot register extra attributes for %s\n",
3560 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, NULL, "sync_action");
3562 if (mddev->pers->sync_request != NULL &&
3563 pers->sync_request == NULL) {
3564 /* need to remove the md_redundancy_group */
3565 if (mddev->to_remove == NULL)
3566 mddev->to_remove = &md_redundancy_group;
3569 if (mddev->pers->sync_request == NULL &&
3571 /* We are converting from a no-redundancy array
3572 * to a redundancy array and metadata is managed
3573 * externally so we need to be sure that writes
3574 * won't block due to a need to transition
3576 * until external management is started.
3579 mddev->safemode_delay = 0;
3580 mddev->safemode = 0;
3583 rdev_for_each(rdev, mddev) {
3584 if (rdev->raid_disk < 0)
3586 if (rdev->new_raid_disk >= mddev->raid_disks)
3587 rdev->new_raid_disk = -1;
3588 if (rdev->new_raid_disk == rdev->raid_disk)
3590 sysfs_unlink_rdev(mddev, rdev);
3592 rdev_for_each(rdev, mddev) {
3593 if (rdev->raid_disk < 0)
3595 if (rdev->new_raid_disk == rdev->raid_disk)
3597 rdev->raid_disk = rdev->new_raid_disk;
3598 if (rdev->raid_disk < 0)
3599 clear_bit(In_sync, &rdev->flags);
3601 if (sysfs_link_rdev(mddev, rdev))
3602 printk(KERN_WARNING "md: cannot register rd%d"
3603 " for %s after level change\n",
3604 rdev->raid_disk, mdname(mddev));
3608 module_put(mddev->pers->owner);
3610 mddev->private = priv;
3611 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
3612 mddev->level = mddev->new_level;
3613 mddev->layout = mddev->new_layout;
3614 mddev->chunk_sectors = mddev->new_chunk_sectors;
3615 mddev->delta_disks = 0;
3616 mddev->reshape_backwards = 0;
3617 mddev->degraded = 0;
3618 if (mddev->pers->sync_request == NULL) {
3619 /* this is now an array without redundancy, so
3620 * it must always be in_sync
3623 del_timer_sync(&mddev->safemode_timer);
3626 set_bit(MD_CHANGE_DEVS, &mddev->flags);
3627 mddev_resume(mddev);
3628 sysfs_notify(&mddev->kobj, NULL, "level");
3629 md_new_event(mddev);
3633 static struct md_sysfs_entry md_level =
3634 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
3638 layout_show(struct mddev *mddev, char *page)
3640 /* just a number, not meaningful for all levels */
3641 if (mddev->reshape_position != MaxSector &&
3642 mddev->layout != mddev->new_layout)
3643 return sprintf(page, "%d (%d)\n",
3644 mddev->new_layout, mddev->layout);
3645 return sprintf(page, "%d\n", mddev->layout);
3649 layout_store(struct mddev *mddev, const char *buf, size_t len)
3652 unsigned long n = simple_strtoul(buf, &e, 10);
3654 if (!*buf || (*e && *e != '\n'))
3659 if (mddev->pers->check_reshape == NULL)
3661 mddev->new_layout = n;
3662 err = mddev->pers->check_reshape(mddev);
3664 mddev->new_layout = mddev->layout;
3668 mddev->new_layout = n;
3669 if (mddev->reshape_position == MaxSector)
3674 static struct md_sysfs_entry md_layout =
3675 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
3679 raid_disks_show(struct mddev *mddev, char *page)
3681 if (mddev->raid_disks == 0)
3683 if (mddev->reshape_position != MaxSector &&
3684 mddev->delta_disks != 0)
3685 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
3686 mddev->raid_disks - mddev->delta_disks);
3687 return sprintf(page, "%d\n", mddev->raid_disks);
3690 static int update_raid_disks(struct mddev *mddev, int raid_disks);
3693 raid_disks_store(struct mddev *mddev, const char *buf, size_t len)
3697 unsigned long n = simple_strtoul(buf, &e, 10);
3699 if (!*buf || (*e && *e != '\n'))
3703 rv = update_raid_disks(mddev, n);
3704 else if (mddev->reshape_position != MaxSector) {
3705 struct md_rdev *rdev;
3706 int olddisks = mddev->raid_disks - mddev->delta_disks;
3708 rdev_for_each(rdev, mddev) {
3710 rdev->data_offset < rdev->new_data_offset)
3713 rdev->data_offset > rdev->new_data_offset)
3716 mddev->delta_disks = n - olddisks;
3717 mddev->raid_disks = n;
3718 mddev->reshape_backwards = (mddev->delta_disks < 0);
3720 mddev->raid_disks = n;
3721 return rv ? rv : len;
3723 static struct md_sysfs_entry md_raid_disks =
3724 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
3727 chunk_size_show(struct mddev *mddev, char *page)
3729 if (mddev->reshape_position != MaxSector &&
3730 mddev->chunk_sectors != mddev->new_chunk_sectors)
3731 return sprintf(page, "%d (%d)\n",
3732 mddev->new_chunk_sectors << 9,
3733 mddev->chunk_sectors << 9);
3734 return sprintf(page, "%d\n", mddev->chunk_sectors << 9);
3738 chunk_size_store(struct mddev *mddev, const char *buf, size_t len)
3741 unsigned long n = simple_strtoul(buf, &e, 10);
3743 if (!*buf || (*e && *e != '\n'))
3748 if (mddev->pers->check_reshape == NULL)
3750 mddev->new_chunk_sectors = n >> 9;
3751 err = mddev->pers->check_reshape(mddev);
3753 mddev->new_chunk_sectors = mddev->chunk_sectors;
3757 mddev->new_chunk_sectors = n >> 9;
3758 if (mddev->reshape_position == MaxSector)
3759 mddev->chunk_sectors = n >> 9;
3763 static struct md_sysfs_entry md_chunk_size =
3764 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
3767 resync_start_show(struct mddev *mddev, char *page)
3769 if (mddev->recovery_cp == MaxSector)
3770 return sprintf(page, "none\n");
3771 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
3775 resync_start_store(struct mddev *mddev, const char *buf, size_t len)
3778 unsigned long long n = simple_strtoull(buf, &e, 10);
3780 if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
3782 if (cmd_match(buf, "none"))
3784 else if (!*buf || (*e && *e != '\n'))
3787 mddev->recovery_cp = n;
3789 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
3792 static struct md_sysfs_entry md_resync_start =
3793 __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store);
3796 * The array state can be:
3799 * No devices, no size, no level
3800 * Equivalent to STOP_ARRAY ioctl
3802 * May have some settings, but array is not active
3803 * all IO results in error
3804 * When written, doesn't tear down array, but just stops it
3805 * suspended (not supported yet)
3806 * All IO requests will block. The array can be reconfigured.
3807 * Writing this, if accepted, will block until array is quiescent
3809 * no resync can happen. no superblocks get written.
3810 * write requests fail
3812 * like readonly, but behaves like 'clean' on a write request.
3814 * clean - no pending writes, but otherwise active.
3815 * When written to inactive array, starts without resync
3816 * If a write request arrives then
3817 * if metadata is known, mark 'dirty' and switch to 'active'.
3818 * if not known, block and switch to write-pending
3819 * If written to an active array that has pending writes, then fails.
3821 * fully active: IO and resync can be happening.
3822 * When written to inactive array, starts with resync
3825 * clean, but writes are blocked waiting for 'active' to be written.
3828 * like active, but no writes have been seen for a while (100msec).
3831 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
3832 write_pending, active_idle, bad_word};
3833 static char *array_states[] = {
3834 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3835 "write-pending", "active-idle", NULL };
3837 static int match_word(const char *word, char **list)
3840 for (n=0; list[n]; n++)
3841 if (cmd_match(word, list[n]))
3847 array_state_show(struct mddev *mddev, char *page)
3849 enum array_state st = inactive;
3862 else if (test_bit(MD_CHANGE_PENDING, &mddev->flags))
3864 else if (mddev->safemode)
3870 if (list_empty(&mddev->disks) &&
3871 mddev->raid_disks == 0 &&
3872 mddev->dev_sectors == 0)
3877 return sprintf(page, "%s\n", array_states[st]);
3880 static int do_md_stop(struct mddev * mddev, int ro, struct block_device *bdev);
3881 static int md_set_readonly(struct mddev * mddev, struct block_device *bdev);
3882 static int do_md_run(struct mddev * mddev);
3883 static int restart_array(struct mddev *mddev);
3886 array_state_store(struct mddev *mddev, const char *buf, size_t len)
3889 enum array_state st = match_word(buf, array_states);
3894 /* stopping an active array */
3895 err = do_md_stop(mddev, 0, NULL);
3898 /* stopping an active array */
3900 err = do_md_stop(mddev, 2, NULL);
3902 err = 0; /* already inactive */
3905 break; /* not supported yet */
3908 err = md_set_readonly(mddev, NULL);
3911 set_disk_ro(mddev->gendisk, 1);
3912 err = do_md_run(mddev);
3918 err = md_set_readonly(mddev, NULL);
3919 else if (mddev->ro == 1)
3920 err = restart_array(mddev);
3923 set_disk_ro(mddev->gendisk, 0);
3927 err = do_md_run(mddev);
3932 restart_array(mddev);
3933 spin_lock_irq(&mddev->write_lock);
3934 if (atomic_read(&mddev->writes_pending) == 0) {
3935 if (mddev->in_sync == 0) {
3937 if (mddev->safemode == 1)
3938 mddev->safemode = 0;
3939 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
3944 spin_unlock_irq(&mddev->write_lock);
3950 restart_array(mddev);
3951 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
3952 wake_up(&mddev->sb_wait);
3956 set_disk_ro(mddev->gendisk, 0);
3957 err = do_md_run(mddev);
3962 /* these cannot be set */
3968 if (mddev->hold_active == UNTIL_IOCTL)
3969 mddev->hold_active = 0;
3970 sysfs_notify_dirent_safe(mddev->sysfs_state);
3974 static struct md_sysfs_entry md_array_state =
3975 __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
3978 max_corrected_read_errors_show(struct mddev *mddev, char *page) {
3979 return sprintf(page, "%d\n",
3980 atomic_read(&mddev->max_corr_read_errors));
3984 max_corrected_read_errors_store(struct mddev *mddev, const char *buf, size_t len)
3987 unsigned long n = simple_strtoul(buf, &e, 10);
3989 if (*buf && (*e == 0 || *e == '\n')) {
3990 atomic_set(&mddev->max_corr_read_errors, n);
3996 static struct md_sysfs_entry max_corr_read_errors =
3997 __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show,
3998 max_corrected_read_errors_store);
4001 null_show(struct mddev *mddev, char *page)
4007 new_dev_store(struct mddev *mddev, const char *buf, size_t len)
4009 /* buf must be %d:%d\n? giving major and minor numbers */
4010 /* The new device is added to the array.
4011 * If the array has a persistent superblock, we read the
4012 * superblock to initialise info and check validity.
4013 * Otherwise, only checking done is that in bind_rdev_to_array,
4014 * which mainly checks size.
4017 int major = simple_strtoul(buf, &e, 10);
4020 struct md_rdev *rdev;
4023 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
4025 minor = simple_strtoul(e+1, &e, 10);
4026 if (*e && *e != '\n')
4028 dev = MKDEV(major, minor);
4029 if (major != MAJOR(dev) ||
4030 minor != MINOR(dev))
4034 if (mddev->persistent) {
4035 rdev = md_import_device(dev, mddev->major_version,
4036 mddev->minor_version);
4037 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
4038 struct md_rdev *rdev0
4039 = list_entry(mddev->disks.next,
4040 struct md_rdev, same_set);
4041 err = super_types[mddev->major_version]
4042 .load_super(rdev, rdev0, mddev->minor_version);
4046 } else if (mddev->external)
4047 rdev = md_import_device(dev, -2, -1);
4049 rdev = md_import_device(dev, -1, -1);
4052 return PTR_ERR(rdev);
4053 err = bind_rdev_to_array(rdev, mddev);
4057 return err ? err : len;
4060 static struct md_sysfs_entry md_new_device =
4061 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
4064 bitmap_store(struct mddev *mddev, const char *buf, size_t len)
4067 unsigned long chunk, end_chunk;
4071 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
4073 chunk = end_chunk = simple_strtoul(buf, &end, 0);
4074 if (buf == end) break;
4075 if (*end == '-') { /* range */
4077 end_chunk = simple_strtoul(buf, &end, 0);
4078 if (buf == end) break;
4080 if (*end && !isspace(*end)) break;
4081 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
4082 buf = skip_spaces(end);
4084 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
4089 static struct md_sysfs_entry md_bitmap =
4090 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
4093 size_show(struct mddev *mddev, char *page)
4095 return sprintf(page, "%llu\n",
4096 (unsigned long long)mddev->dev_sectors / 2);
4099 static int update_size(struct mddev *mddev, sector_t num_sectors);
4102 size_store(struct mddev *mddev, const char *buf, size_t len)
4104 /* If array is inactive, we can reduce the component size, but
4105 * not increase it (except from 0).
4106 * If array is active, we can try an on-line resize
4109 int err = strict_blocks_to_sectors(buf, §ors);
4114 err = update_size(mddev, sectors);
4115 md_update_sb(mddev, 1);
4117 if (mddev->dev_sectors == 0 ||
4118 mddev->dev_sectors > sectors)
4119 mddev->dev_sectors = sectors;
4123 return err ? err : len;
4126 static struct md_sysfs_entry md_size =
4127 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
4130 /* Metadata version.
4132 * 'none' for arrays with no metadata (good luck...)
4133 * 'external' for arrays with externally managed metadata,
4134 * or N.M for internally known formats
4137 metadata_show(struct mddev *mddev, char *page)
4139 if (mddev->persistent)
4140 return sprintf(page, "%d.%d\n",
4141 mddev->major_version, mddev->minor_version);
4142 else if (mddev->external)
4143 return sprintf(page, "external:%s\n", mddev->metadata_type);
4145 return sprintf(page, "none\n");
4149 metadata_store(struct mddev *mddev, const char *buf, size_t len)
4153 /* Changing the details of 'external' metadata is
4154 * always permitted. Otherwise there must be
4155 * no devices attached to the array.
4157 if (mddev->external && strncmp(buf, "external:", 9) == 0)
4159 else if (!list_empty(&mddev->disks))
4162 if (cmd_match(buf, "none")) {
4163 mddev->persistent = 0;
4164 mddev->external = 0;
4165 mddev->major_version = 0;
4166 mddev->minor_version = 90;
4169 if (strncmp(buf, "external:", 9) == 0) {
4170 size_t namelen = len-9;
4171 if (namelen >= sizeof(mddev->metadata_type))
4172 namelen = sizeof(mddev->metadata_type)-1;
4173 strncpy(mddev->metadata_type, buf+9, namelen);
4174 mddev->metadata_type[namelen] = 0;
4175 if (namelen && mddev->metadata_type[namelen-1] == '\n')
4176 mddev->metadata_type[--namelen] = 0;
4177 mddev->persistent = 0;
4178 mddev->external = 1;
4179 mddev->major_version = 0;
4180 mddev->minor_version = 90;
4183 major = simple_strtoul(buf, &e, 10);
4184 if (e==buf || *e != '.')
4187 minor = simple_strtoul(buf, &e, 10);
4188 if (e==buf || (*e && *e != '\n') )
4190 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
4192 mddev->major_version = major;
4193 mddev->minor_version = minor;
4194 mddev->persistent = 1;
4195 mddev->external = 0;
4199 static struct md_sysfs_entry md_metadata =
4200 __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
4203 action_show(struct mddev *mddev, char *page)
4205 char *type = "idle";
4206 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
4208 else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
4209 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) {
4210 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
4212 else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
4213 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
4215 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
4219 } else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
4222 return sprintf(page, "%s\n", type);
4225 static void reap_sync_thread(struct mddev *mddev);
4228 action_store(struct mddev *mddev, const char *page, size_t len)
4230 if (!mddev->pers || !mddev->pers->sync_request)
4233 if (cmd_match(page, "frozen"))
4234 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4236 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4238 if (cmd_match(page, "idle") || cmd_match(page, "frozen")) {
4239 if (mddev->sync_thread) {
4240 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4241 reap_sync_thread(mddev);
4243 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
4244 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
4246 else if (cmd_match(page, "resync"))
4247 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4248 else if (cmd_match(page, "recover")) {
4249 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
4250 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4251 } else if (cmd_match(page, "reshape")) {
4253 if (mddev->pers->start_reshape == NULL)
4255 err = mddev->pers->start_reshape(mddev);
4258 sysfs_notify(&mddev->kobj, NULL, "degraded");
4260 if (cmd_match(page, "check"))
4261 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
4262 else if (!cmd_match(page, "repair"))
4264 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
4265 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
4267 if (mddev->ro == 2) {
4268 /* A write to sync_action is enough to justify
4269 * canceling read-auto mode
4272 md_wakeup_thread(mddev->sync_thread);
4274 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4275 md_wakeup_thread(mddev->thread);
4276 sysfs_notify_dirent_safe(mddev->sysfs_action);
4281 mismatch_cnt_show(struct mddev *mddev, char *page)
4283 return sprintf(page, "%llu\n",
4284 (unsigned long long)
4285 atomic64_read(&mddev->resync_mismatches));
4288 static struct md_sysfs_entry md_scan_mode =
4289 __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
4292 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
4295 sync_min_show(struct mddev *mddev, char *page)
4297 return sprintf(page, "%d (%s)\n", speed_min(mddev),
4298 mddev->sync_speed_min ? "local": "system");
4302 sync_min_store(struct mddev *mddev, const char *buf, size_t len)
4306 if (strncmp(buf, "system", 6)==0) {
4307 mddev->sync_speed_min = 0;
4310 min = simple_strtoul(buf, &e, 10);
4311 if (buf == e || (*e && *e != '\n') || min <= 0)
4313 mddev->sync_speed_min = min;
4317 static struct md_sysfs_entry md_sync_min =
4318 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
4321 sync_max_show(struct mddev *mddev, char *page)
4323 return sprintf(page, "%d (%s)\n", speed_max(mddev),
4324 mddev->sync_speed_max ? "local": "system");
4328 sync_max_store(struct mddev *mddev, const char *buf, size_t len)
4332 if (strncmp(buf, "system", 6)==0) {
4333 mddev->sync_speed_max = 0;
4336 max = simple_strtoul(buf, &e, 10);
4337 if (buf == e || (*e && *e != '\n') || max <= 0)
4339 mddev->sync_speed_max = max;
4343 static struct md_sysfs_entry md_sync_max =
4344 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
4347 degraded_show(struct mddev *mddev, char *page)
4349 return sprintf(page, "%d\n", mddev->degraded);
4351 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
4354 sync_force_parallel_show(struct mddev *mddev, char *page)
4356 return sprintf(page, "%d\n", mddev->parallel_resync);
4360 sync_force_parallel_store(struct mddev *mddev, const char *buf, size_t len)
4364 if (strict_strtol(buf, 10, &n))
4367 if (n != 0 && n != 1)
4370 mddev->parallel_resync = n;
4372 if (mddev->sync_thread)
4373 wake_up(&resync_wait);
4378 /* force parallel resync, even with shared block devices */
4379 static struct md_sysfs_entry md_sync_force_parallel =
4380 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
4381 sync_force_parallel_show, sync_force_parallel_store);
4384 sync_speed_show(struct mddev *mddev, char *page)
4386 unsigned long resync, dt, db;
4387 if (mddev->curr_resync == 0)
4388 return sprintf(page, "none\n");
4389 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
4390 dt = (jiffies - mddev->resync_mark) / HZ;
4392 db = resync - mddev->resync_mark_cnt;
4393 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
4396 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
4399 sync_completed_show(struct mddev *mddev, char *page)
4401 unsigned long long max_sectors, resync;
4403 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4404 return sprintf(page, "none\n");
4406 if (mddev->curr_resync == 1 ||
4407 mddev->curr_resync == 2)
4408 return sprintf(page, "delayed\n");
4410 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
4411 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
4412 max_sectors = mddev->resync_max_sectors;
4414 max_sectors = mddev->dev_sectors;
4416 resync = mddev->curr_resync_completed;
4417 return sprintf(page, "%llu / %llu\n", resync, max_sectors);
4420 static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed);
4423 min_sync_show(struct mddev *mddev, char *page)
4425 return sprintf(page, "%llu\n",
4426 (unsigned long long)mddev->resync_min);
4429 min_sync_store(struct mddev *mddev, const char *buf, size_t len)
4431 unsigned long long min;
4432 if (strict_strtoull(buf, 10, &min))
4434 if (min > mddev->resync_max)
4436 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4439 /* Must be a multiple of chunk_size */
4440 if (mddev->chunk_sectors) {
4441 sector_t temp = min;
4442 if (sector_div(temp, mddev->chunk_sectors))
4445 mddev->resync_min = min;
4450 static struct md_sysfs_entry md_min_sync =
4451 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
4454 max_sync_show(struct mddev *mddev, char *page)
4456 if (mddev->resync_max == MaxSector)
4457 return sprintf(page, "max\n");
4459 return sprintf(page, "%llu\n",
4460 (unsigned long long)mddev->resync_max);
4463 max_sync_store(struct mddev *mddev, const char *buf, size_t len)
4465 if (strncmp(buf, "max", 3) == 0)
4466 mddev->resync_max = MaxSector;
4468 unsigned long long max;
4469 if (strict_strtoull(buf, 10, &max))
4471 if (max < mddev->resync_min)
4473 if (max < mddev->resync_max &&
4475 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4478 /* Must be a multiple of chunk_size */
4479 if (mddev->chunk_sectors) {
4480 sector_t temp = max;
4481 if (sector_div(temp, mddev->chunk_sectors))
4484 mddev->resync_max = max;
4486 wake_up(&mddev->recovery_wait);
4490 static struct md_sysfs_entry md_max_sync =
4491 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
4494 suspend_lo_show(struct mddev *mddev, char *page)
4496 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
4500 suspend_lo_store(struct mddev *mddev, const char *buf, size_t len)
4503 unsigned long long new = simple_strtoull(buf, &e, 10);
4504 unsigned long long old = mddev->suspend_lo;
4506 if (mddev->pers == NULL ||
4507 mddev->pers->quiesce == NULL)
4509 if (buf == e || (*e && *e != '\n'))
4512 mddev->suspend_lo = new;
4514 /* Shrinking suspended region */
4515 mddev->pers->quiesce(mddev, 2);
4517 /* Expanding suspended region - need to wait */
4518 mddev->pers->quiesce(mddev, 1);
4519 mddev->pers->quiesce(mddev, 0);
4523 static struct md_sysfs_entry md_suspend_lo =
4524 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
4528 suspend_hi_show(struct mddev *mddev, char *page)
4530 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
4534 suspend_hi_store(struct mddev *mddev, const char *buf, size_t len)
4537 unsigned long long new = simple_strtoull(buf, &e, 10);
4538 unsigned long long old = mddev->suspend_hi;
4540 if (mddev->pers == NULL ||
4541 mddev->pers->quiesce == NULL)
4543 if (buf == e || (*e && *e != '\n'))
4546 mddev->suspend_hi = new;
4548 /* Shrinking suspended region */
4549 mddev->pers->quiesce(mddev, 2);
4551 /* Expanding suspended region - need to wait */
4552 mddev->pers->quiesce(mddev, 1);
4553 mddev->pers->quiesce(mddev, 0);
4557 static struct md_sysfs_entry md_suspend_hi =
4558 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
4561 reshape_position_show(struct mddev *mddev, char *page)
4563 if (mddev->reshape_position != MaxSector)
4564 return sprintf(page, "%llu\n",
4565 (unsigned long long)mddev->reshape_position);
4566 strcpy(page, "none\n");
4571 reshape_position_store(struct mddev *mddev, const char *buf, size_t len)
4573 struct md_rdev *rdev;
4575 unsigned long long new = simple_strtoull(buf, &e, 10);
4578 if (buf == e || (*e && *e != '\n'))
4580 mddev->reshape_position = new;
4581 mddev->delta_disks = 0;
4582 mddev->reshape_backwards = 0;
4583 mddev->new_level = mddev->level;
4584 mddev->new_layout = mddev->layout;
4585 mddev->new_chunk_sectors = mddev->chunk_sectors;
4586 rdev_for_each(rdev, mddev)
4587 rdev->new_data_offset = rdev->data_offset;
4591 static struct md_sysfs_entry md_reshape_position =
4592 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
4593 reshape_position_store);
4596 reshape_direction_show(struct mddev *mddev, char *page)
4598 return sprintf(page, "%s\n",
4599 mddev->reshape_backwards ? "backwards" : "forwards");
4603 reshape_direction_store(struct mddev *mddev, const char *buf, size_t len)
4606 if (cmd_match(buf, "forwards"))
4608 else if (cmd_match(buf, "backwards"))
4612 if (mddev->reshape_backwards == backwards)
4615 /* check if we are allowed to change */
4616 if (mddev->delta_disks)
4619 if (mddev->persistent &&
4620 mddev->major_version == 0)
4623 mddev->reshape_backwards = backwards;
4627 static struct md_sysfs_entry md_reshape_direction =
4628 __ATTR(reshape_direction, S_IRUGO|S_IWUSR, reshape_direction_show,
4629 reshape_direction_store);
4632 array_size_show(struct mddev *mddev, char *page)
4634 if (mddev->external_size)
4635 return sprintf(page, "%llu\n",
4636 (unsigned long long)mddev->array_sectors/2);
4638 return sprintf(page, "default\n");
4642 array_size_store(struct mddev *mddev, const char *buf, size_t len)
4646 if (strncmp(buf, "default", 7) == 0) {
4648 sectors = mddev->pers->size(mddev, 0, 0);
4650 sectors = mddev->array_sectors;
4652 mddev->external_size = 0;
4654 if (strict_blocks_to_sectors(buf, §ors) < 0)
4656 if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors)
4659 mddev->external_size = 1;
4662 mddev->array_sectors = sectors;
4664 set_capacity(mddev->gendisk, mddev->array_sectors);
4665 revalidate_disk(mddev->gendisk);
4670 static struct md_sysfs_entry md_array_size =
4671 __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show,
4674 static struct attribute *md_default_attrs[] = {
4677 &md_raid_disks.attr,
4678 &md_chunk_size.attr,
4680 &md_resync_start.attr,
4682 &md_new_device.attr,
4683 &md_safe_delay.attr,
4684 &md_array_state.attr,
4685 &md_reshape_position.attr,
4686 &md_reshape_direction.attr,
4687 &md_array_size.attr,
4688 &max_corr_read_errors.attr,
4692 static struct attribute *md_redundancy_attrs[] = {
4694 &md_mismatches.attr,
4697 &md_sync_speed.attr,
4698 &md_sync_force_parallel.attr,
4699 &md_sync_completed.attr,
4702 &md_suspend_lo.attr,
4703 &md_suspend_hi.attr,
4708 static struct attribute_group md_redundancy_group = {
4710 .attrs = md_redundancy_attrs,
4715 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
4717 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
4718 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
4723 spin_lock(&all_mddevs_lock);
4724 if (list_empty(&mddev->all_mddevs)) {
4725 spin_unlock(&all_mddevs_lock);
4729 spin_unlock(&all_mddevs_lock);
4731 rv = mddev_lock(mddev);
4733 rv = entry->show(mddev, page);
4734 mddev_unlock(mddev);
4741 md_attr_store(struct kobject *kobj, struct attribute *attr,
4742 const char *page, size_t length)
4744 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
4745 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
4750 if (!capable(CAP_SYS_ADMIN))
4752 spin_lock(&all_mddevs_lock);
4753 if (list_empty(&mddev->all_mddevs)) {
4754 spin_unlock(&all_mddevs_lock);
4758 spin_unlock(&all_mddevs_lock);
4759 if (entry->store == new_dev_store)
4760 flush_workqueue(md_misc_wq);
4761 rv = mddev_lock(mddev);
4763 rv = entry->store(mddev, page, length);
4764 mddev_unlock(mddev);
4770 static void md_free(struct kobject *ko)
4772 struct mddev *mddev = container_of(ko, struct mddev, kobj);
4774 if (mddev->sysfs_state)
4775 sysfs_put(mddev->sysfs_state);
4777 if (mddev->gendisk) {
4778 del_gendisk(mddev->gendisk);
4779 put_disk(mddev->gendisk);
4782 blk_cleanup_queue(mddev->queue);
4787 static const struct sysfs_ops md_sysfs_ops = {
4788 .show = md_attr_show,
4789 .store = md_attr_store,
4791 static struct kobj_type md_ktype = {
4793 .sysfs_ops = &md_sysfs_ops,
4794 .default_attrs = md_default_attrs,
4799 static void mddev_delayed_delete(struct work_struct *ws)
4801 struct mddev *mddev = container_of(ws, struct mddev, del_work);
4803 sysfs_remove_group(&mddev->kobj, &md_bitmap_group);
4804 kobject_del(&mddev->kobj);
4805 kobject_put(&mddev->kobj);
4808 static int md_alloc(dev_t dev, char *name)
4810 static DEFINE_MUTEX(disks_mutex);
4811 struct mddev *mddev = mddev_find(dev);
4812 struct gendisk *disk;
4821 partitioned = (MAJOR(mddev->unit) != MD_MAJOR);
4822 shift = partitioned ? MdpMinorShift : 0;
4823 unit = MINOR(mddev->unit) >> shift;
4825 /* wait for any previous instance of this device to be
4826 * completely removed (mddev_delayed_delete).
4828 flush_workqueue(md_misc_wq);
4830 mutex_lock(&disks_mutex);
4836 /* Need to ensure that 'name' is not a duplicate.
4838 struct mddev *mddev2;
4839 spin_lock(&all_mddevs_lock);
4841 list_for_each_entry(mddev2, &all_mddevs, all_mddevs)
4842 if (mddev2->gendisk &&
4843 strcmp(mddev2->gendisk->disk_name, name) == 0) {
4844 spin_unlock(&all_mddevs_lock);
4847 spin_unlock(&all_mddevs_lock);
4851 mddev->queue = blk_alloc_queue(GFP_KERNEL);
4854 mddev->queue->queuedata = mddev;
4856 blk_queue_make_request(mddev->queue, md_make_request);
4857 blk_set_stacking_limits(&mddev->queue->limits);
4859 disk = alloc_disk(1 << shift);
4861 blk_cleanup_queue(mddev->queue);
4862 mddev->queue = NULL;
4865 disk->major = MAJOR(mddev->unit);
4866 disk->first_minor = unit << shift;
4868 strcpy(disk->disk_name, name);
4869 else if (partitioned)
4870 sprintf(disk->disk_name, "md_d%d", unit);
4872 sprintf(disk->disk_name, "md%d", unit);
4873 disk->fops = &md_fops;
4874 disk->private_data = mddev;
4875 disk->queue = mddev->queue;
4876 blk_queue_flush(mddev->queue, REQ_FLUSH | REQ_FUA);
4877 /* Allow extended partitions. This makes the
4878 * 'mdp' device redundant, but we can't really
4881 disk->flags |= GENHD_FL_EXT_DEVT;
4882 mddev->gendisk = disk;
4883 /* As soon as we call add_disk(), another thread could get
4884 * through to md_open, so make sure it doesn't get too far
4886 mutex_lock(&mddev->open_mutex);
4889 error = kobject_init_and_add(&mddev->kobj, &md_ktype,
4890 &disk_to_dev(disk)->kobj, "%s", "md");
4892 /* This isn't possible, but as kobject_init_and_add is marked
4893 * __must_check, we must do something with the result
4895 printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
4899 if (mddev->kobj.sd &&
4900 sysfs_create_group(&mddev->kobj, &md_bitmap_group))
4901 printk(KERN_DEBUG "pointless warning\n");
4902 mutex_unlock(&mddev->open_mutex);
4904 mutex_unlock(&disks_mutex);
4905 if (!error && mddev->kobj.sd) {
4906 kobject_uevent(&mddev->kobj, KOBJ_ADD);
4907 mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state");
4913 static struct kobject *md_probe(dev_t dev, int *part, void *data)
4915 md_alloc(dev, NULL);
4919 static int add_named_array(const char *val, struct kernel_param *kp)
4921 /* val must be "md_*" where * is not all digits.
4922 * We allocate an array with a large free minor number, and
4923 * set the name to val. val must not already be an active name.
4925 int len = strlen(val);
4926 char buf[DISK_NAME_LEN];
4928 while (len && val[len-1] == '\n')
4930 if (len >= DISK_NAME_LEN)
4932 strlcpy(buf, val, len+1);
4933 if (strncmp(buf, "md_", 3) != 0)
4935 return md_alloc(0, buf);
4938 static void md_safemode_timeout(unsigned long data)
4940 struct mddev *mddev = (struct mddev *) data;
4942 if (!atomic_read(&mddev->writes_pending)) {
4943 mddev->safemode = 1;
4944 if (mddev->external)
4945 sysfs_notify_dirent_safe(mddev->sysfs_state);
4947 md_wakeup_thread(mddev->thread);
4950 static int start_dirty_degraded;
4952 int md_run(struct mddev *mddev)
4955 struct md_rdev *rdev;
4956 struct md_personality *pers;
4958 if (list_empty(&mddev->disks))
4959 /* cannot run an array with no devices.. */
4964 /* Cannot run until previous stop completes properly */
4965 if (mddev->sysfs_active)
4969 * Analyze all RAID superblock(s)
4971 if (!mddev->raid_disks) {
4972 if (!mddev->persistent)
4977 if (mddev->level != LEVEL_NONE)
4978 request_module("md-level-%d", mddev->level);
4979 else if (mddev->clevel[0])
4980 request_module("md-%s", mddev->clevel);
4983 * Drop all container device buffers, from now on
4984 * the only valid external interface is through the md
4987 rdev_for_each(rdev, mddev) {
4988 if (test_bit(Faulty, &rdev->flags))
4990 sync_blockdev(rdev->bdev);
4991 invalidate_bdev(rdev->bdev);
4993 /* perform some consistency tests on the device.
4994 * We don't want the data to overlap the metadata,
4995 * Internal Bitmap issues have been handled elsewhere.
4997 if (rdev->meta_bdev) {
4998 /* Nothing to check */;
4999 } else if (rdev->data_offset < rdev->sb_start) {
5000 if (mddev->dev_sectors &&
5001 rdev->data_offset + mddev->dev_sectors
5003 printk("md: %s: data overlaps metadata\n",
5008 if (rdev->sb_start + rdev->sb_size/512
5009 > rdev->data_offset) {
5010 printk("md: %s: metadata overlaps data\n",
5015 sysfs_notify_dirent_safe(rdev->sysfs_state);
5018 if (mddev->bio_set == NULL)
5019 mddev->bio_set = bioset_create(BIO_POOL_SIZE, 0);
5021 spin_lock(&pers_lock);
5022 pers = find_pers(mddev->level, mddev->clevel);
5023 if (!pers || !try_module_get(pers->owner)) {
5024 spin_unlock(&pers_lock);
5025 if (mddev->level != LEVEL_NONE)
5026 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
5029 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
5034 spin_unlock(&pers_lock);
5035 if (mddev->level != pers->level) {
5036 mddev->level = pers->level;
5037 mddev->new_level = pers->level;
5039 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
5041 if (mddev->reshape_position != MaxSector &&
5042 pers->start_reshape == NULL) {
5043 /* This personality cannot handle reshaping... */
5045 module_put(pers->owner);
5049 if (pers->sync_request) {
5050 /* Warn if this is a potentially silly
5053 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
5054 struct md_rdev *rdev2;
5057 rdev_for_each(rdev, mddev)
5058 rdev_for_each(rdev2, mddev) {
5060 rdev->bdev->bd_contains ==
5061 rdev2->bdev->bd_contains) {
5063 "%s: WARNING: %s appears to be"
5064 " on the same physical disk as"
5067 bdevname(rdev->bdev,b),
5068 bdevname(rdev2->bdev,b2));
5075 "True protection against single-disk"
5076 " failure might be compromised.\n");
5079 mddev->recovery = 0;
5080 /* may be over-ridden by personality */
5081 mddev->resync_max_sectors = mddev->dev_sectors;
5083 mddev->ok_start_degraded = start_dirty_degraded;
5085 if (start_readonly && mddev->ro == 0)
5086 mddev->ro = 2; /* read-only, but switch on first write */
5088 err = mddev->pers->run(mddev);
5090 printk(KERN_ERR "md: pers->run() failed ...\n");
5091 else if (mddev->pers->size(mddev, 0, 0) < mddev->array_sectors) {
5092 WARN_ONCE(!mddev->external_size, "%s: default size too small,"
5093 " but 'external_size' not in effect?\n", __func__);
5095 "md: invalid array_size %llu > default size %llu\n",
5096 (unsigned long long)mddev->array_sectors / 2,
5097 (unsigned long long)mddev->pers->size(mddev, 0, 0) / 2);
5099 mddev->pers->stop(mddev);
5101 if (err == 0 && mddev->pers->sync_request &&
5102 (mddev->bitmap_info.file || mddev->bitmap_info.offset)) {
5103 err = bitmap_create(mddev);
5105 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
5106 mdname(mddev), err);
5107 mddev->pers->stop(mddev);
5111 module_put(mddev->pers->owner);
5113 bitmap_destroy(mddev);
5116 if (mddev->pers->sync_request) {
5117 if (mddev->kobj.sd &&
5118 sysfs_create_group(&mddev->kobj, &md_redundancy_group))
5120 "md: cannot register extra attributes for %s\n",
5122 mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action");
5123 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
5126 atomic_set(&mddev->writes_pending,0);
5127 atomic_set(&mddev->max_corr_read_errors,
5128 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS);
5129 mddev->safemode = 0;
5130 mddev->safemode_timer.function = md_safemode_timeout;
5131 mddev->safemode_timer.data = (unsigned long) mddev;
5132 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
5136 rdev_for_each(rdev, mddev)
5137 if (rdev->raid_disk >= 0)
5138 if (sysfs_link_rdev(mddev, rdev))
5139 /* failure here is OK */;
5141 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5144 md_update_sb(mddev, 0);
5146 md_new_event(mddev);
5147 sysfs_notify_dirent_safe(mddev->sysfs_state);
5148 sysfs_notify_dirent_safe(mddev->sysfs_action);
5149 sysfs_notify(&mddev->kobj, NULL, "degraded");
5152 EXPORT_SYMBOL_GPL(md_run);
5154 static int do_md_run(struct mddev *mddev)
5158 err = md_run(mddev);
5161 err = bitmap_load(mddev);
5163 bitmap_destroy(mddev);
5167 md_wakeup_thread(mddev->thread);
5168 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
5170 set_capacity(mddev->gendisk, mddev->array_sectors);
5171 revalidate_disk(mddev->gendisk);
5173 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
5178 static int restart_array(struct mddev *mddev)
5180 struct gendisk *disk = mddev->gendisk;
5182 /* Complain if it has no devices */
5183 if (list_empty(&mddev->disks))
5189 mddev->safemode = 0;
5191 set_disk_ro(disk, 0);
5192 printk(KERN_INFO "md: %s switched to read-write mode.\n",
5194 /* Kick recovery or resync if necessary */
5195 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5196 md_wakeup_thread(mddev->thread);
5197 md_wakeup_thread(mddev->sync_thread);
5198 sysfs_notify_dirent_safe(mddev->sysfs_state);
5202 /* similar to deny_write_access, but accounts for our holding a reference
5203 * to the file ourselves */
5204 static int deny_bitmap_write_access(struct file * file)
5206 struct inode *inode = file->f_mapping->host;
5208 spin_lock(&inode->i_lock);
5209 if (atomic_read(&inode->i_writecount) > 1) {
5210 spin_unlock(&inode->i_lock);
5213 atomic_set(&inode->i_writecount, -1);
5214 spin_unlock(&inode->i_lock);
5219 void restore_bitmap_write_access(struct file *file)
5221 struct inode *inode = file->f_mapping->host;
5223 spin_lock(&inode->i_lock);
5224 atomic_set(&inode->i_writecount, 1);
5225 spin_unlock(&inode->i_lock);
5228 static void md_clean(struct mddev *mddev)
5230 mddev->array_sectors = 0;
5231 mddev->external_size = 0;
5232 mddev->dev_sectors = 0;
5233 mddev->raid_disks = 0;
5234 mddev->recovery_cp = 0;
5235 mddev->resync_min = 0;
5236 mddev->resync_max = MaxSector;
5237 mddev->reshape_position = MaxSector;
5238 mddev->external = 0;
5239 mddev->persistent = 0;
5240 mddev->level = LEVEL_NONE;
5241 mddev->clevel[0] = 0;
5244 mddev->metadata_type[0] = 0;
5245 mddev->chunk_sectors = 0;
5246 mddev->ctime = mddev->utime = 0;
5248 mddev->max_disks = 0;
5250 mddev->can_decrease_events = 0;
5251 mddev->delta_disks = 0;
5252 mddev->reshape_backwards = 0;
5253 mddev->new_level = LEVEL_NONE;
5254 mddev->new_layout = 0;
5255 mddev->new_chunk_sectors = 0;
5256 mddev->curr_resync = 0;
5257 atomic64_set(&mddev->resync_mismatches, 0);
5258 mddev->suspend_lo = mddev->suspend_hi = 0;
5259 mddev->sync_speed_min = mddev->sync_speed_max = 0;
5260 mddev->recovery = 0;
5263 mddev->degraded = 0;
5264 mddev->safemode = 0;
5265 mddev->merge_check_needed = 0;
5266 mddev->bitmap_info.offset = 0;
5267 mddev->bitmap_info.default_offset = 0;
5268 mddev->bitmap_info.default_space = 0;
5269 mddev->bitmap_info.chunksize = 0;
5270 mddev->bitmap_info.daemon_sleep = 0;
5271 mddev->bitmap_info.max_write_behind = 0;
5274 static void __md_stop_writes(struct mddev *mddev)
5276 if (mddev->sync_thread) {
5277 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5278 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5279 reap_sync_thread(mddev);
5282 del_timer_sync(&mddev->safemode_timer);
5284 bitmap_flush(mddev);
5285 md_super_wait(mddev);
5287 if (!mddev->in_sync || mddev->flags) {
5288 /* mark array as shutdown cleanly */
5290 md_update_sb(mddev, 1);
5294 void md_stop_writes(struct mddev *mddev)
5297 __md_stop_writes(mddev);
5298 mddev_unlock(mddev);
5300 EXPORT_SYMBOL_GPL(md_stop_writes);
5302 static void __md_stop(struct mddev *mddev)
5305 mddev->pers->stop(mddev);
5306 if (mddev->pers->sync_request && mddev->to_remove == NULL)
5307 mddev->to_remove = &md_redundancy_group;
5308 module_put(mddev->pers->owner);
5310 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5313 void md_stop(struct mddev *mddev)
5315 /* stop the array and free an attached data structures.
5316 * This is called from dm-raid
5319 bitmap_destroy(mddev);
5321 bioset_free(mddev->bio_set);
5324 EXPORT_SYMBOL_GPL(md_stop);
5326 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev)
5329 mutex_lock(&mddev->open_mutex);
5330 if (atomic_read(&mddev->openers) > !!bdev) {
5331 printk("md: %s still in use.\n",mdname(mddev));
5336 sync_blockdev(bdev);
5338 __md_stop_writes(mddev);
5344 set_disk_ro(mddev->gendisk, 1);
5345 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5346 sysfs_notify_dirent_safe(mddev->sysfs_state);
5350 mutex_unlock(&mddev->open_mutex);
5355 * 0 - completely stop and dis-assemble array
5356 * 2 - stop but do not disassemble array
5358 static int do_md_stop(struct mddev * mddev, int mode,
5359 struct block_device *bdev)
5361 struct gendisk *disk = mddev->gendisk;
5362 struct md_rdev *rdev;
5364 mutex_lock(&mddev->open_mutex);
5365 if (atomic_read(&mddev->openers) > !!bdev ||
5366 mddev->sysfs_active) {
5367 printk("md: %s still in use.\n",mdname(mddev));
5368 mutex_unlock(&mddev->open_mutex);
5372 /* It is possible IO was issued on some other
5373 * open file which was closed before we took ->open_mutex.
5374 * As that was not the last close __blkdev_put will not
5375 * have called sync_blockdev, so we must.
5377 sync_blockdev(bdev);
5381 set_disk_ro(disk, 0);
5383 __md_stop_writes(mddev);
5385 mddev->queue->merge_bvec_fn = NULL;
5386 mddev->queue->backing_dev_info.congested_fn = NULL;
5388 /* tell userspace to handle 'inactive' */
5389 sysfs_notify_dirent_safe(mddev->sysfs_state);
5391 rdev_for_each(rdev, mddev)
5392 if (rdev->raid_disk >= 0)
5393 sysfs_unlink_rdev(mddev, rdev);
5395 set_capacity(disk, 0);
5396 mutex_unlock(&mddev->open_mutex);
5398 revalidate_disk(disk);
5403 mutex_unlock(&mddev->open_mutex);
5405 * Free resources if final stop
5408 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
5410 bitmap_destroy(mddev);
5411 if (mddev->bitmap_info.file) {
5412 restore_bitmap_write_access(mddev->bitmap_info.file);
5413 fput(mddev->bitmap_info.file);
5414 mddev->bitmap_info.file = NULL;
5416 mddev->bitmap_info.offset = 0;
5418 export_array(mddev);
5421 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
5422 if (mddev->hold_active == UNTIL_STOP)
5423 mddev->hold_active = 0;
5425 blk_integrity_unregister(disk);
5426 md_new_event(mddev);
5427 sysfs_notify_dirent_safe(mddev->sysfs_state);
5432 static void autorun_array(struct mddev *mddev)
5434 struct md_rdev *rdev;
5437 if (list_empty(&mddev->disks))
5440 printk(KERN_INFO "md: running: ");
5442 rdev_for_each(rdev, mddev) {
5443 char b[BDEVNAME_SIZE];
5444 printk("<%s>", bdevname(rdev->bdev,b));
5448 err = do_md_run(mddev);
5450 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
5451 do_md_stop(mddev, 0, NULL);
5456 * lets try to run arrays based on all disks that have arrived
5457 * until now. (those are in pending_raid_disks)
5459 * the method: pick the first pending disk, collect all disks with
5460 * the same UUID, remove all from the pending list and put them into
5461 * the 'same_array' list. Then order this list based on superblock
5462 * update time (freshest comes first), kick out 'old' disks and
5463 * compare superblocks. If everything's fine then run it.
5465 * If "unit" is allocated, then bump its reference count
5467 static void autorun_devices(int part)
5469 struct md_rdev *rdev0, *rdev, *tmp;
5470 struct mddev *mddev;
5471 char b[BDEVNAME_SIZE];
5473 printk(KERN_INFO "md: autorun ...\n");
5474 while (!list_empty(&pending_raid_disks)) {
5477 LIST_HEAD(candidates);
5478 rdev0 = list_entry(pending_raid_disks.next,
5479 struct md_rdev, same_set);
5481 printk(KERN_INFO "md: considering %s ...\n",
5482 bdevname(rdev0->bdev,b));
5483 INIT_LIST_HEAD(&candidates);
5484 rdev_for_each_list(rdev, tmp, &pending_raid_disks)
5485 if (super_90_load(rdev, rdev0, 0) >= 0) {
5486 printk(KERN_INFO "md: adding %s ...\n",
5487 bdevname(rdev->bdev,b));
5488 list_move(&rdev->same_set, &candidates);
5491 * now we have a set of devices, with all of them having
5492 * mostly sane superblocks. It's time to allocate the
5496 dev = MKDEV(mdp_major,
5497 rdev0->preferred_minor << MdpMinorShift);
5498 unit = MINOR(dev) >> MdpMinorShift;
5500 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
5503 if (rdev0->preferred_minor != unit) {
5504 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
5505 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
5509 md_probe(dev, NULL, NULL);
5510 mddev = mddev_find(dev);
5511 if (!mddev || !mddev->gendisk) {
5515 "md: cannot allocate memory for md drive.\n");
5518 if (mddev_lock(mddev))
5519 printk(KERN_WARNING "md: %s locked, cannot run\n",
5521 else if (mddev->raid_disks || mddev->major_version
5522 || !list_empty(&mddev->disks)) {
5524 "md: %s already running, cannot run %s\n",
5525 mdname(mddev), bdevname(rdev0->bdev,b));
5526 mddev_unlock(mddev);
5528 printk(KERN_INFO "md: created %s\n", mdname(mddev));
5529 mddev->persistent = 1;
5530 rdev_for_each_list(rdev, tmp, &candidates) {
5531 list_del_init(&rdev->same_set);
5532 if (bind_rdev_to_array(rdev, mddev))
5535 autorun_array(mddev);
5536 mddev_unlock(mddev);
5538 /* on success, candidates will be empty, on error
5541 rdev_for_each_list(rdev, tmp, &candidates) {
5542 list_del_init(&rdev->same_set);
5547 printk(KERN_INFO "md: ... autorun DONE.\n");
5549 #endif /* !MODULE */
5551 static int get_version(void __user * arg)
5555 ver.major = MD_MAJOR_VERSION;
5556 ver.minor = MD_MINOR_VERSION;
5557 ver.patchlevel = MD_PATCHLEVEL_VERSION;
5559 if (copy_to_user(arg, &ver, sizeof(ver)))
5565 static int get_array_info(struct mddev * mddev, void __user * arg)
5567 mdu_array_info_t info;
5568 int nr,working,insync,failed,spare;
5569 struct md_rdev *rdev;
5571 nr = working = insync = failed = spare = 0;
5573 rdev_for_each_rcu(rdev, mddev) {
5575 if (test_bit(Faulty, &rdev->flags))
5579 if (test_bit(In_sync, &rdev->flags))
5587 info.major_version = mddev->major_version;
5588 info.minor_version = mddev->minor_version;
5589 info.patch_version = MD_PATCHLEVEL_VERSION;
5590 info.ctime = mddev->ctime;
5591 info.level = mddev->level;
5592 info.size = mddev->dev_sectors / 2;
5593 if (info.size != mddev->dev_sectors / 2) /* overflow */
5596 info.raid_disks = mddev->raid_disks;
5597 info.md_minor = mddev->md_minor;
5598 info.not_persistent= !mddev->persistent;
5600 info.utime = mddev->utime;
5603 info.state = (1<<MD_SB_CLEAN);
5604 if (mddev->bitmap && mddev->bitmap_info.offset)
5605 info.state = (1<<MD_SB_BITMAP_PRESENT);
5606 info.active_disks = insync;
5607 info.working_disks = working;
5608 info.failed_disks = failed;
5609 info.spare_disks = spare;
5611 info.layout = mddev->layout;
5612 info.chunk_size = mddev->chunk_sectors << 9;
5614 if (copy_to_user(arg, &info, sizeof(info)))
5620 static int get_bitmap_file(struct mddev * mddev, void __user * arg)
5622 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
5623 char *ptr, *buf = NULL;
5626 if (md_allow_write(mddev))
5627 file = kmalloc(sizeof(*file), GFP_NOIO);
5629 file = kmalloc(sizeof(*file), GFP_KERNEL);
5634 /* bitmap disabled, zero the first byte and copy out */
5635 if (!mddev->bitmap || !mddev->bitmap->storage.file) {
5636 file->pathname[0] = '\0';
5640 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
5644 ptr = d_path(&mddev->bitmap->storage.file->f_path,
5645 buf, sizeof(file->pathname));
5649 strcpy(file->pathname, ptr);
5653 if (copy_to_user(arg, file, sizeof(*file)))
5661 static int get_disk_info(struct mddev * mddev, void __user * arg)
5663 mdu_disk_info_t info;
5664 struct md_rdev *rdev;
5666 if (copy_from_user(&info, arg, sizeof(info)))
5670 rdev = find_rdev_nr_rcu(mddev, info.number);
5672 info.major = MAJOR(rdev->bdev->bd_dev);
5673 info.minor = MINOR(rdev->bdev->bd_dev);
5674 info.raid_disk = rdev->raid_disk;
5676 if (test_bit(Faulty, &rdev->flags))
5677 info.state |= (1<<MD_DISK_FAULTY);
5678 else if (test_bit(In_sync, &rdev->flags)) {
5679 info.state |= (1<<MD_DISK_ACTIVE);
5680 info.state |= (1<<MD_DISK_SYNC);
5682 if (test_bit(WriteMostly, &rdev->flags))
5683 info.state |= (1<<MD_DISK_WRITEMOSTLY);
5685 info.major = info.minor = 0;
5686 info.raid_disk = -1;
5687 info.state = (1<<MD_DISK_REMOVED);
5691 if (copy_to_user(arg, &info, sizeof(info)))
5697 static int add_new_disk(struct mddev * mddev, mdu_disk_info_t *info)
5699 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
5700 struct md_rdev *rdev;
5701 dev_t dev = MKDEV(info->major,info->minor);
5703 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
5706 if (!mddev->raid_disks) {
5708 /* expecting a device which has a superblock */
5709 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
5712 "md: md_import_device returned %ld\n",
5714 return PTR_ERR(rdev);
5716 if (!list_empty(&mddev->disks)) {
5717 struct md_rdev *rdev0
5718 = list_entry(mddev->disks.next,
5719 struct md_rdev, same_set);
5720 err = super_types[mddev->major_version]
5721 .load_super(rdev, rdev0, mddev->minor_version);
5724 "md: %s has different UUID to %s\n",
5725 bdevname(rdev->bdev,b),
5726 bdevname(rdev0->bdev,b2));
5731 err = bind_rdev_to_array(rdev, mddev);
5738 * add_new_disk can be used once the array is assembled
5739 * to add "hot spares". They must already have a superblock
5744 if (!mddev->pers->hot_add_disk) {
5746 "%s: personality does not support diskops!\n",
5750 if (mddev->persistent)
5751 rdev = md_import_device(dev, mddev->major_version,
5752 mddev->minor_version);
5754 rdev = md_import_device(dev, -1, -1);
5757 "md: md_import_device returned %ld\n",
5759 return PTR_ERR(rdev);
5761 /* set saved_raid_disk if appropriate */
5762 if (!mddev->persistent) {
5763 if (info->state & (1<<MD_DISK_SYNC) &&
5764 info->raid_disk < mddev->raid_disks) {
5765 rdev->raid_disk = info->raid_disk;
5766 set_bit(In_sync, &rdev->flags);
5768 rdev->raid_disk = -1;
5770 super_types[mddev->major_version].
5771 validate_super(mddev, rdev);
5772 if ((info->state & (1<<MD_DISK_SYNC)) &&
5773 rdev->raid_disk != info->raid_disk) {
5774 /* This was a hot-add request, but events doesn't
5775 * match, so reject it.
5781 if (test_bit(In_sync, &rdev->flags))
5782 rdev->saved_raid_disk = rdev->raid_disk;
5784 rdev->saved_raid_disk = -1;
5786 clear_bit(In_sync, &rdev->flags); /* just to be sure */
5787 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
5788 set_bit(WriteMostly, &rdev->flags);
5790 clear_bit(WriteMostly, &rdev->flags);
5792 rdev->raid_disk = -1;
5793 err = bind_rdev_to_array(rdev, mddev);
5794 if (!err && !mddev->pers->hot_remove_disk) {
5795 /* If there is hot_add_disk but no hot_remove_disk
5796 * then added disks for geometry changes,
5797 * and should be added immediately.
5799 super_types[mddev->major_version].
5800 validate_super(mddev, rdev);
5801 err = mddev->pers->hot_add_disk(mddev, rdev);
5803 unbind_rdev_from_array(rdev);
5808 sysfs_notify_dirent_safe(rdev->sysfs_state);
5810 md_update_sb(mddev, 1);
5811 if (mddev->degraded)
5812 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
5813 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5815 md_new_event(mddev);
5816 md_wakeup_thread(mddev->thread);
5820 /* otherwise, add_new_disk is only allowed
5821 * for major_version==0 superblocks
5823 if (mddev->major_version != 0) {
5824 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
5829 if (!(info->state & (1<<MD_DISK_FAULTY))) {
5831 rdev = md_import_device(dev, -1, 0);
5834 "md: error, md_import_device() returned %ld\n",
5836 return PTR_ERR(rdev);
5838 rdev->desc_nr = info->number;
5839 if (info->raid_disk < mddev->raid_disks)
5840 rdev->raid_disk = info->raid_disk;
5842 rdev->raid_disk = -1;
5844 if (rdev->raid_disk < mddev->raid_disks)
5845 if (info->state & (1<<MD_DISK_SYNC))
5846 set_bit(In_sync, &rdev->flags);
5848 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
5849 set_bit(WriteMostly, &rdev->flags);
5851 if (!mddev->persistent) {
5852 printk(KERN_INFO "md: nonpersistent superblock ...\n");
5853 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
5855 rdev->sb_start = calc_dev_sboffset(rdev);
5856 rdev->sectors = rdev->sb_start;
5858 err = bind_rdev_to_array(rdev, mddev);
5868 static int hot_remove_disk(struct mddev * mddev, dev_t dev)
5870 char b[BDEVNAME_SIZE];
5871 struct md_rdev *rdev;
5873 rdev = find_rdev(mddev, dev);
5877 if (rdev->raid_disk >= 0)
5880 kick_rdev_from_array(rdev);
5881 md_update_sb(mddev, 1);
5882 md_new_event(mddev);
5886 printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n",
5887 bdevname(rdev->bdev,b), mdname(mddev));
5891 static int hot_add_disk(struct mddev * mddev, dev_t dev)
5893 char b[BDEVNAME_SIZE];
5895 struct md_rdev *rdev;
5900 if (mddev->major_version != 0) {
5901 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
5902 " version-0 superblocks.\n",
5906 if (!mddev->pers->hot_add_disk) {
5908 "%s: personality does not support diskops!\n",
5913 rdev = md_import_device(dev, -1, 0);
5916 "md: error, md_import_device() returned %ld\n",
5921 if (mddev->persistent)
5922 rdev->sb_start = calc_dev_sboffset(rdev);
5924 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
5926 rdev->sectors = rdev->sb_start;
5928 if (test_bit(Faulty, &rdev->flags)) {
5930 "md: can not hot-add faulty %s disk to %s!\n",
5931 bdevname(rdev->bdev,b), mdname(mddev));
5935 clear_bit(In_sync, &rdev->flags);
5937 rdev->saved_raid_disk = -1;
5938 err = bind_rdev_to_array(rdev, mddev);
5943 * The rest should better be atomic, we can have disk failures
5944 * noticed in interrupt contexts ...
5947 rdev->raid_disk = -1;
5949 md_update_sb(mddev, 1);
5952 * Kick recovery, maybe this spare has to be added to the
5953 * array immediately.
5955 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5956 md_wakeup_thread(mddev->thread);
5957 md_new_event(mddev);
5965 static int set_bitmap_file(struct mddev *mddev, int fd)
5970 if (!mddev->pers->quiesce)
5972 if (mddev->recovery || mddev->sync_thread)
5974 /* we should be able to change the bitmap.. */
5980 return -EEXIST; /* cannot add when bitmap is present */
5981 mddev->bitmap_info.file = fget(fd);
5983 if (mddev->bitmap_info.file == NULL) {
5984 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
5989 err = deny_bitmap_write_access(mddev->bitmap_info.file);
5991 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
5993 fput(mddev->bitmap_info.file);
5994 mddev->bitmap_info.file = NULL;
5997 mddev->bitmap_info.offset = 0; /* file overrides offset */
5998 } else if (mddev->bitmap == NULL)
5999 return -ENOENT; /* cannot remove what isn't there */
6002 mddev->pers->quiesce(mddev, 1);
6004 err = bitmap_create(mddev);
6006 err = bitmap_load(mddev);
6008 if (fd < 0 || err) {
6009 bitmap_destroy(mddev);
6010 fd = -1; /* make sure to put the file */
6012 mddev->pers->quiesce(mddev, 0);
6015 if (mddev->bitmap_info.file) {
6016 restore_bitmap_write_access(mddev->bitmap_info.file);
6017 fput(mddev->bitmap_info.file);
6019 mddev->bitmap_info.file = NULL;
6026 * set_array_info is used two different ways
6027 * The original usage is when creating a new array.
6028 * In this usage, raid_disks is > 0 and it together with
6029 * level, size, not_persistent,layout,chunksize determine the
6030 * shape of the array.
6031 * This will always create an array with a type-0.90.0 superblock.
6032 * The newer usage is when assembling an array.
6033 * In this case raid_disks will be 0, and the major_version field is
6034 * use to determine which style super-blocks are to be found on the devices.
6035 * The minor and patch _version numbers are also kept incase the
6036 * super_block handler wishes to interpret them.
6038 static int set_array_info(struct mddev * mddev, mdu_array_info_t *info)
6041 if (info->raid_disks == 0) {
6042 /* just setting version number for superblock loading */
6043 if (info->major_version < 0 ||
6044 info->major_version >= ARRAY_SIZE(super_types) ||
6045 super_types[info->major_version].name == NULL) {
6046 /* maybe try to auto-load a module? */
6048 "md: superblock version %d not known\n",
6049 info->major_version);
6052 mddev->major_version = info->major_version;
6053 mddev->minor_version = info->minor_version;
6054 mddev->patch_version = info->patch_version;
6055 mddev->persistent = !info->not_persistent;
6056 /* ensure mddev_put doesn't delete this now that there
6057 * is some minimal configuration.
6059 mddev->ctime = get_seconds();
6062 mddev->major_version = MD_MAJOR_VERSION;
6063 mddev->minor_version = MD_MINOR_VERSION;
6064 mddev->patch_version = MD_PATCHLEVEL_VERSION;
6065 mddev->ctime = get_seconds();
6067 mddev->level = info->level;
6068 mddev->clevel[0] = 0;
6069 mddev->dev_sectors = 2 * (sector_t)info->size;
6070 mddev->raid_disks = info->raid_disks;
6071 /* don't set md_minor, it is determined by which /dev/md* was
6074 if (info->state & (1<<MD_SB_CLEAN))
6075 mddev->recovery_cp = MaxSector;
6077 mddev->recovery_cp = 0;
6078 mddev->persistent = ! info->not_persistent;
6079 mddev->external = 0;
6081 mddev->layout = info->layout;
6082 mddev->chunk_sectors = info->chunk_size >> 9;
6084 mddev->max_disks = MD_SB_DISKS;
6086 if (mddev->persistent)
6088 set_bit(MD_CHANGE_DEVS, &mddev->flags);
6090 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
6091 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
6092 mddev->bitmap_info.offset = 0;
6094 mddev->reshape_position = MaxSector;
6097 * Generate a 128 bit UUID
6099 get_random_bytes(mddev->uuid, 16);
6101 mddev->new_level = mddev->level;
6102 mddev->new_chunk_sectors = mddev->chunk_sectors;
6103 mddev->new_layout = mddev->layout;
6104 mddev->delta_disks = 0;
6105 mddev->reshape_backwards = 0;
6110 void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors)
6112 WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__);
6114 if (mddev->external_size)
6117 mddev->array_sectors = array_sectors;
6119 EXPORT_SYMBOL(md_set_array_sectors);
6121 static int update_size(struct mddev *mddev, sector_t num_sectors)
6123 struct md_rdev *rdev;
6125 int fit = (num_sectors == 0);
6127 if (mddev->pers->resize == NULL)
6129 /* The "num_sectors" is the number of sectors of each device that
6130 * is used. This can only make sense for arrays with redundancy.
6131 * linear and raid0 always use whatever space is available. We can only
6132 * consider changing this number if no resync or reconstruction is
6133 * happening, and if the new size is acceptable. It must fit before the
6134 * sb_start or, if that is <data_offset, it must fit before the size
6135 * of each device. If num_sectors is zero, we find the largest size
6138 if (mddev->sync_thread)
6141 rdev_for_each(rdev, mddev) {
6142 sector_t avail = rdev->sectors;
6144 if (fit && (num_sectors == 0 || num_sectors > avail))
6145 num_sectors = avail;
6146 if (avail < num_sectors)
6149 rv = mddev->pers->resize(mddev, num_sectors);
6151 revalidate_disk(mddev->gendisk);
6155 static int update_raid_disks(struct mddev *mddev, int raid_disks)
6158 struct md_rdev *rdev;
6159 /* change the number of raid disks */
6160 if (mddev->pers->check_reshape == NULL)
6162 if (raid_disks <= 0 ||
6163 (mddev->max_disks && raid_disks >= mddev->max_disks))
6165 if (mddev->sync_thread || mddev->reshape_position != MaxSector)
6168 rdev_for_each(rdev, mddev) {
6169 if (mddev->raid_disks < raid_disks &&
6170 rdev->data_offset < rdev->new_data_offset)
6172 if (mddev->raid_disks > raid_disks &&
6173 rdev->data_offset > rdev->new_data_offset)
6177 mddev->delta_disks = raid_disks - mddev->raid_disks;
6178 if (mddev->delta_disks < 0)
6179 mddev->reshape_backwards = 1;
6180 else if (mddev->delta_disks > 0)
6181 mddev->reshape_backwards = 0;
6183 rv = mddev->pers->check_reshape(mddev);
6185 mddev->delta_disks = 0;
6186 mddev->reshape_backwards = 0;
6193 * update_array_info is used to change the configuration of an
6195 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
6196 * fields in the info are checked against the array.
6197 * Any differences that cannot be handled will cause an error.
6198 * Normally, only one change can be managed at a time.
6200 static int update_array_info(struct mddev *mddev, mdu_array_info_t *info)
6206 /* calculate expected state,ignoring low bits */
6207 if (mddev->bitmap && mddev->bitmap_info.offset)
6208 state |= (1 << MD_SB_BITMAP_PRESENT);
6210 if (mddev->major_version != info->major_version ||
6211 mddev->minor_version != info->minor_version ||
6212 /* mddev->patch_version != info->patch_version || */
6213 mddev->ctime != info->ctime ||
6214 mddev->level != info->level ||
6215 /* mddev->layout != info->layout || */
6216 !mddev->persistent != info->not_persistent||
6217 mddev->chunk_sectors != info->chunk_size >> 9 ||
6218 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
6219 ((state^info->state) & 0xfffffe00)
6222 /* Check there is only one change */
6223 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
6225 if (mddev->raid_disks != info->raid_disks)
6227 if (mddev->layout != info->layout)
6229 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT))
6236 if (mddev->layout != info->layout) {
6238 * we don't need to do anything at the md level, the
6239 * personality will take care of it all.
6241 if (mddev->pers->check_reshape == NULL)
6244 mddev->new_layout = info->layout;
6245 rv = mddev->pers->check_reshape(mddev);
6247 mddev->new_layout = mddev->layout;
6251 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
6252 rv = update_size(mddev, (sector_t)info->size * 2);
6254 if (mddev->raid_disks != info->raid_disks)
6255 rv = update_raid_disks(mddev, info->raid_disks);
6257 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
6258 if (mddev->pers->quiesce == NULL)
6260 if (mddev->recovery || mddev->sync_thread)
6262 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
6263 /* add the bitmap */
6266 if (mddev->bitmap_info.default_offset == 0)
6268 mddev->bitmap_info.offset =
6269 mddev->bitmap_info.default_offset;
6270 mddev->bitmap_info.space =
6271 mddev->bitmap_info.default_space;
6272 mddev->pers->quiesce(mddev, 1);
6273 rv = bitmap_create(mddev);
6275 rv = bitmap_load(mddev);
6277 bitmap_destroy(mddev);
6278 mddev->pers->quiesce(mddev, 0);
6280 /* remove the bitmap */
6283 if (mddev->bitmap->storage.file)
6285 mddev->pers->quiesce(mddev, 1);
6286 bitmap_destroy(mddev);
6287 mddev->pers->quiesce(mddev, 0);
6288 mddev->bitmap_info.offset = 0;
6291 md_update_sb(mddev, 1);
6295 static int set_disk_faulty(struct mddev *mddev, dev_t dev)
6297 struct md_rdev *rdev;
6300 if (mddev->pers == NULL)
6304 rdev = find_rdev_rcu(mddev, dev);
6308 md_error(mddev, rdev);
6309 if (!test_bit(Faulty, &rdev->flags))
6317 * We have a problem here : there is no easy way to give a CHS
6318 * virtual geometry. We currently pretend that we have a 2 heads
6319 * 4 sectors (with a BIG number of cylinders...). This drives
6320 * dosfs just mad... ;-)
6322 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
6324 struct mddev *mddev = bdev->bd_disk->private_data;
6328 geo->cylinders = mddev->array_sectors / 8;
6332 static int md_ioctl(struct block_device *bdev, fmode_t mode,
6333 unsigned int cmd, unsigned long arg)
6336 void __user *argp = (void __user *)arg;
6337 struct mddev *mddev = NULL;
6342 case GET_ARRAY_INFO:
6346 if (!capable(CAP_SYS_ADMIN))
6351 * Commands dealing with the RAID driver but not any
6356 err = get_version(argp);
6359 case PRINT_RAID_DEBUG:
6367 autostart_arrays(arg);
6374 * Commands creating/starting a new array:
6377 mddev = bdev->bd_disk->private_data;
6384 /* Some actions do not requires the mutex */
6386 case GET_ARRAY_INFO:
6387 if (!mddev->raid_disks && !mddev->external)
6390 err = get_array_info(mddev, argp);
6394 if (!mddev->raid_disks && !mddev->external)
6397 err = get_disk_info(mddev, argp);
6400 case SET_DISK_FAULTY:
6401 err = set_disk_faulty(mddev, new_decode_dev(arg));
6405 if (cmd == ADD_NEW_DISK)
6406 /* need to ensure md_delayed_delete() has completed */
6407 flush_workqueue(md_misc_wq);
6409 err = mddev_lock(mddev);
6412 "md: ioctl lock interrupted, reason %d, cmd %d\n",
6417 if (cmd == SET_ARRAY_INFO) {
6418 mdu_array_info_t info;
6420 memset(&info, 0, sizeof(info));
6421 else if (copy_from_user(&info, argp, sizeof(info))) {
6426 err = update_array_info(mddev, &info);
6428 printk(KERN_WARNING "md: couldn't update"
6429 " array info. %d\n", err);
6434 if (!list_empty(&mddev->disks)) {
6436 "md: array %s already has disks!\n",
6441 if (mddev->raid_disks) {
6443 "md: array %s already initialised!\n",
6448 err = set_array_info(mddev, &info);
6450 printk(KERN_WARNING "md: couldn't set"
6451 " array info. %d\n", err);
6458 * Commands querying/configuring an existing array:
6460 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
6461 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
6462 if ((!mddev->raid_disks && !mddev->external)
6463 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
6464 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
6465 && cmd != GET_BITMAP_FILE) {
6471 * Commands even a read-only array can execute:
6474 case GET_BITMAP_FILE:
6475 err = get_bitmap_file(mddev, argp);
6478 case RESTART_ARRAY_RW:
6479 err = restart_array(mddev);
6483 err = do_md_stop(mddev, 0, bdev);
6487 err = md_set_readonly(mddev, bdev);
6491 if (get_user(ro, (int __user *)(arg))) {
6497 /* if the bdev is going readonly the value of mddev->ro
6498 * does not matter, no writes are coming
6503 /* are we are already prepared for writes? */
6507 /* transitioning to readauto need only happen for
6508 * arrays that call md_write_start
6511 err = restart_array(mddev);
6514 set_disk_ro(mddev->gendisk, 0);
6521 * The remaining ioctls are changing the state of the
6522 * superblock, so we do not allow them on read-only arrays.
6523 * However non-MD ioctls (e.g. get-size) will still come through
6524 * here and hit the 'default' below, so only disallow
6525 * 'md' ioctls, and switch to rw mode if started auto-readonly.
6527 if (_IOC_TYPE(cmd) == MD_MAJOR && mddev->ro && mddev->pers) {
6528 if (mddev->ro == 2) {
6530 sysfs_notify_dirent_safe(mddev->sysfs_state);
6531 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6532 md_wakeup_thread(mddev->thread);
6542 mdu_disk_info_t info;
6543 if (copy_from_user(&info, argp, sizeof(info)))
6546 err = add_new_disk(mddev, &info);
6550 case HOT_REMOVE_DISK:
6551 err = hot_remove_disk(mddev, new_decode_dev(arg));
6555 err = hot_add_disk(mddev, new_decode_dev(arg));
6559 err = do_md_run(mddev);
6562 case SET_BITMAP_FILE:
6563 err = set_bitmap_file(mddev, (int)arg);
6573 if (mddev->hold_active == UNTIL_IOCTL &&
6575 mddev->hold_active = 0;
6576 mddev_unlock(mddev);
6585 #ifdef CONFIG_COMPAT
6586 static int md_compat_ioctl(struct block_device *bdev, fmode_t mode,
6587 unsigned int cmd, unsigned long arg)
6590 case HOT_REMOVE_DISK:
6592 case SET_DISK_FAULTY:
6593 case SET_BITMAP_FILE:
6594 /* These take in integer arg, do not convert */
6597 arg = (unsigned long)compat_ptr(arg);
6601 return md_ioctl(bdev, mode, cmd, arg);
6603 #endif /* CONFIG_COMPAT */
6605 static int md_open(struct block_device *bdev, fmode_t mode)
6608 * Succeed if we can lock the mddev, which confirms that
6609 * it isn't being stopped right now.
6611 struct mddev *mddev = mddev_find(bdev->bd_dev);
6617 if (mddev->gendisk != bdev->bd_disk) {
6618 /* we are racing with mddev_put which is discarding this
6622 /* Wait until bdev->bd_disk is definitely gone */
6623 flush_workqueue(md_misc_wq);
6624 /* Then retry the open from the top */
6625 return -ERESTARTSYS;
6627 BUG_ON(mddev != bdev->bd_disk->private_data);
6629 if ((err = mutex_lock_interruptible(&mddev->open_mutex)))
6633 atomic_inc(&mddev->openers);
6634 mutex_unlock(&mddev->open_mutex);
6636 check_disk_change(bdev);
6641 static int md_release(struct gendisk *disk, fmode_t mode)
6643 struct mddev *mddev = disk->private_data;
6646 atomic_dec(&mddev->openers);
6652 static int md_media_changed(struct gendisk *disk)
6654 struct mddev *mddev = disk->private_data;
6656 return mddev->changed;
6659 static int md_revalidate(struct gendisk *disk)
6661 struct mddev *mddev = disk->private_data;
6666 static const struct block_device_operations md_fops =
6668 .owner = THIS_MODULE,
6670 .release = md_release,
6672 #ifdef CONFIG_COMPAT
6673 .compat_ioctl = md_compat_ioctl,
6675 .getgeo = md_getgeo,
6676 .media_changed = md_media_changed,
6677 .revalidate_disk= md_revalidate,
6680 static int md_thread(void * arg)
6682 struct md_thread *thread = arg;
6685 * md_thread is a 'system-thread', it's priority should be very
6686 * high. We avoid resource deadlocks individually in each
6687 * raid personality. (RAID5 does preallocation) We also use RR and
6688 * the very same RT priority as kswapd, thus we will never get
6689 * into a priority inversion deadlock.
6691 * we definitely have to have equal or higher priority than
6692 * bdflush, otherwise bdflush will deadlock if there are too
6693 * many dirty RAID5 blocks.
6696 allow_signal(SIGKILL);
6697 while (!kthread_should_stop()) {
6699 /* We need to wait INTERRUPTIBLE so that
6700 * we don't add to the load-average.
6701 * That means we need to be sure no signals are
6704 if (signal_pending(current))
6705 flush_signals(current);
6707 wait_event_interruptible_timeout
6709 test_bit(THREAD_WAKEUP, &thread->flags)
6710 || kthread_should_stop(),
6713 clear_bit(THREAD_WAKEUP, &thread->flags);
6714 if (!kthread_should_stop())
6715 thread->run(thread);
6721 void md_wakeup_thread(struct md_thread *thread)
6724 pr_debug("md: waking up MD thread %s.\n", thread->tsk->comm);
6725 set_bit(THREAD_WAKEUP, &thread->flags);
6726 wake_up(&thread->wqueue);
6730 struct md_thread *md_register_thread(void (*run) (struct md_thread *),
6731 struct mddev *mddev, const char *name)
6733 struct md_thread *thread;
6735 thread = kzalloc(sizeof(struct md_thread), GFP_KERNEL);
6739 init_waitqueue_head(&thread->wqueue);
6742 thread->mddev = mddev;
6743 thread->timeout = MAX_SCHEDULE_TIMEOUT;
6744 thread->tsk = kthread_run(md_thread, thread,
6746 mdname(thread->mddev),
6748 if (IS_ERR(thread->tsk)) {
6755 void md_unregister_thread(struct md_thread **threadp)
6757 struct md_thread *thread = *threadp;
6760 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
6761 /* Locking ensures that mddev_unlock does not wake_up a
6762 * non-existent thread
6764 spin_lock(&pers_lock);
6766 spin_unlock(&pers_lock);
6768 kthread_stop(thread->tsk);
6772 void md_error(struct mddev *mddev, struct md_rdev *rdev)
6779 if (!rdev || test_bit(Faulty, &rdev->flags))
6782 if (!mddev->pers || !mddev->pers->error_handler)
6784 mddev->pers->error_handler(mddev,rdev);
6785 if (mddev->degraded)
6786 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6787 sysfs_notify_dirent_safe(rdev->sysfs_state);
6788 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6789 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6790 md_wakeup_thread(mddev->thread);
6791 if (mddev->event_work.func)
6792 queue_work(md_misc_wq, &mddev->event_work);
6793 md_new_event_inintr(mddev);
6796 /* seq_file implementation /proc/mdstat */
6798 static void status_unused(struct seq_file *seq)
6801 struct md_rdev *rdev;
6803 seq_printf(seq, "unused devices: ");
6805 list_for_each_entry(rdev, &pending_raid_disks, same_set) {
6806 char b[BDEVNAME_SIZE];
6808 seq_printf(seq, "%s ",
6809 bdevname(rdev->bdev,b));
6812 seq_printf(seq, "<none>");
6814 seq_printf(seq, "\n");
6818 static void status_resync(struct seq_file *seq, struct mddev * mddev)
6820 sector_t max_sectors, resync, res;
6821 unsigned long dt, db;
6824 unsigned int per_milli;
6826 if (mddev->curr_resync <= 3)
6829 resync = mddev->curr_resync
6830 - atomic_read(&mddev->recovery_active);
6832 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
6833 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
6834 max_sectors = mddev->resync_max_sectors;
6836 max_sectors = mddev->dev_sectors;
6839 * Should not happen.
6845 /* Pick 'scale' such that (resync>>scale)*1000 will fit
6846 * in a sector_t, and (max_sectors>>scale) will fit in a
6847 * u32, as those are the requirements for sector_div.
6848 * Thus 'scale' must be at least 10
6851 if (sizeof(sector_t) > sizeof(unsigned long)) {
6852 while ( max_sectors/2 > (1ULL<<(scale+32)))
6855 res = (resync>>scale)*1000;
6856 sector_div(res, (u32)((max_sectors>>scale)+1));
6860 int i, x = per_milli/50, y = 20-x;
6861 seq_printf(seq, "[");
6862 for (i = 0; i < x; i++)
6863 seq_printf(seq, "=");
6864 seq_printf(seq, ">");
6865 for (i = 0; i < y; i++)
6866 seq_printf(seq, ".");
6867 seq_printf(seq, "] ");
6869 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
6870 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
6872 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
6874 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
6875 "resync" : "recovery"))),
6876 per_milli/10, per_milli % 10,
6877 (unsigned long long) resync/2,
6878 (unsigned long long) max_sectors/2);
6881 * dt: time from mark until now
6882 * db: blocks written from mark until now
6883 * rt: remaining time
6885 * rt is a sector_t, so could be 32bit or 64bit.
6886 * So we divide before multiply in case it is 32bit and close
6888 * We scale the divisor (db) by 32 to avoid losing precision
6889 * near the end of resync when the number of remaining sectors
6891 * We then divide rt by 32 after multiplying by db to compensate.
6892 * The '+1' avoids division by zero if db is very small.
6894 dt = ((jiffies - mddev->resync_mark) / HZ);
6896 db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active))
6897 - mddev->resync_mark_cnt;
6899 rt = max_sectors - resync; /* number of remaining sectors */
6900 sector_div(rt, db/32+1);
6904 seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60,
6905 ((unsigned long)rt % 60)/6);
6907 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
6910 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
6912 struct list_head *tmp;
6914 struct mddev *mddev;
6922 spin_lock(&all_mddevs_lock);
6923 list_for_each(tmp,&all_mddevs)
6925 mddev = list_entry(tmp, struct mddev, all_mddevs);
6927 spin_unlock(&all_mddevs_lock);
6930 spin_unlock(&all_mddevs_lock);
6932 return (void*)2;/* tail */
6936 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
6938 struct list_head *tmp;
6939 struct mddev *next_mddev, *mddev = v;
6945 spin_lock(&all_mddevs_lock);
6947 tmp = all_mddevs.next;
6949 tmp = mddev->all_mddevs.next;
6950 if (tmp != &all_mddevs)
6951 next_mddev = mddev_get(list_entry(tmp,struct mddev,all_mddevs));
6953 next_mddev = (void*)2;
6956 spin_unlock(&all_mddevs_lock);
6964 static void md_seq_stop(struct seq_file *seq, void *v)
6966 struct mddev *mddev = v;
6968 if (mddev && v != (void*)1 && v != (void*)2)
6972 static int md_seq_show(struct seq_file *seq, void *v)
6974 struct mddev *mddev = v;
6976 struct md_rdev *rdev;
6978 if (v == (void*)1) {
6979 struct md_personality *pers;
6980 seq_printf(seq, "Personalities : ");
6981 spin_lock(&pers_lock);
6982 list_for_each_entry(pers, &pers_list, list)
6983 seq_printf(seq, "[%s] ", pers->name);
6985 spin_unlock(&pers_lock);
6986 seq_printf(seq, "\n");
6987 seq->poll_event = atomic_read(&md_event_count);
6990 if (v == (void*)2) {
6995 if (mddev_lock(mddev) < 0)
6998 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
6999 seq_printf(seq, "%s : %sactive", mdname(mddev),
7000 mddev->pers ? "" : "in");
7003 seq_printf(seq, " (read-only)");
7005 seq_printf(seq, " (auto-read-only)");
7006 seq_printf(seq, " %s", mddev->pers->name);
7010 rdev_for_each(rdev, mddev) {
7011 char b[BDEVNAME_SIZE];
7012 seq_printf(seq, " %s[%d]",
7013 bdevname(rdev->bdev,b), rdev->desc_nr);
7014 if (test_bit(WriteMostly, &rdev->flags))
7015 seq_printf(seq, "(W)");
7016 if (test_bit(Faulty, &rdev->flags)) {
7017 seq_printf(seq, "(F)");
7020 if (rdev->raid_disk < 0)
7021 seq_printf(seq, "(S)"); /* spare */
7022 if (test_bit(Replacement, &rdev->flags))
7023 seq_printf(seq, "(R)");
7024 sectors += rdev->sectors;
7027 if (!list_empty(&mddev->disks)) {
7029 seq_printf(seq, "\n %llu blocks",
7030 (unsigned long long)
7031 mddev->array_sectors / 2);
7033 seq_printf(seq, "\n %llu blocks",
7034 (unsigned long long)sectors / 2);
7036 if (mddev->persistent) {
7037 if (mddev->major_version != 0 ||
7038 mddev->minor_version != 90) {
7039 seq_printf(seq," super %d.%d",
7040 mddev->major_version,
7041 mddev->minor_version);
7043 } else if (mddev->external)
7044 seq_printf(seq, " super external:%s",
7045 mddev->metadata_type);
7047 seq_printf(seq, " super non-persistent");
7050 mddev->pers->status(seq, mddev);
7051 seq_printf(seq, "\n ");
7052 if (mddev->pers->sync_request) {
7053 if (mddev->curr_resync > 2) {
7054 status_resync(seq, mddev);
7055 seq_printf(seq, "\n ");
7056 } else if (mddev->curr_resync >= 1)
7057 seq_printf(seq, "\tresync=DELAYED\n ");
7058 else if (mddev->recovery_cp < MaxSector)
7059 seq_printf(seq, "\tresync=PENDING\n ");
7062 seq_printf(seq, "\n ");
7064 bitmap_status(seq, mddev->bitmap);
7066 seq_printf(seq, "\n");
7068 mddev_unlock(mddev);
7073 static const struct seq_operations md_seq_ops = {
7074 .start = md_seq_start,
7075 .next = md_seq_next,
7076 .stop = md_seq_stop,
7077 .show = md_seq_show,
7080 static int md_seq_open(struct inode *inode, struct file *file)
7082 struct seq_file *seq;
7085 error = seq_open(file, &md_seq_ops);
7089 seq = file->private_data;
7090 seq->poll_event = atomic_read(&md_event_count);
7094 static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
7096 struct seq_file *seq = filp->private_data;
7099 poll_wait(filp, &md_event_waiters, wait);
7101 /* always allow read */
7102 mask = POLLIN | POLLRDNORM;
7104 if (seq->poll_event != atomic_read(&md_event_count))
7105 mask |= POLLERR | POLLPRI;
7109 static const struct file_operations md_seq_fops = {
7110 .owner = THIS_MODULE,
7111 .open = md_seq_open,
7113 .llseek = seq_lseek,
7114 .release = seq_release_private,
7115 .poll = mdstat_poll,
7118 int register_md_personality(struct md_personality *p)
7120 spin_lock(&pers_lock);
7121 list_add_tail(&p->list, &pers_list);
7122 printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level);
7123 spin_unlock(&pers_lock);
7127 int unregister_md_personality(struct md_personality *p)
7129 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
7130 spin_lock(&pers_lock);
7131 list_del_init(&p->list);
7132 spin_unlock(&pers_lock);
7136 static int is_mddev_idle(struct mddev *mddev, int init)
7138 struct md_rdev * rdev;
7144 rdev_for_each_rcu(rdev, mddev) {
7145 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
7146 curr_events = (int)part_stat_read(&disk->part0, sectors[0]) +
7147 (int)part_stat_read(&disk->part0, sectors[1]) -
7148 atomic_read(&disk->sync_io);
7149 /* sync IO will cause sync_io to increase before the disk_stats
7150 * as sync_io is counted when a request starts, and
7151 * disk_stats is counted when it completes.
7152 * So resync activity will cause curr_events to be smaller than
7153 * when there was no such activity.
7154 * non-sync IO will cause disk_stat to increase without
7155 * increasing sync_io so curr_events will (eventually)
7156 * be larger than it was before. Once it becomes
7157 * substantially larger, the test below will cause
7158 * the array to appear non-idle, and resync will slow
7160 * If there is a lot of outstanding resync activity when
7161 * we set last_event to curr_events, then all that activity
7162 * completing might cause the array to appear non-idle
7163 * and resync will be slowed down even though there might
7164 * not have been non-resync activity. This will only
7165 * happen once though. 'last_events' will soon reflect
7166 * the state where there is little or no outstanding
7167 * resync requests, and further resync activity will
7168 * always make curr_events less than last_events.
7171 if (init || curr_events - rdev->last_events > 64) {
7172 rdev->last_events = curr_events;
7180 void md_done_sync(struct mddev *mddev, int blocks, int ok)
7182 /* another "blocks" (512byte) blocks have been synced */
7183 atomic_sub(blocks, &mddev->recovery_active);
7184 wake_up(&mddev->recovery_wait);
7186 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7187 set_bit(MD_RECOVERY_ERROR, &mddev->recovery);
7188 md_wakeup_thread(mddev->thread);
7189 // stop recovery, signal do_sync ....
7194 /* md_write_start(mddev, bi)
7195 * If we need to update some array metadata (e.g. 'active' flag
7196 * in superblock) before writing, schedule a superblock update
7197 * and wait for it to complete.
7199 void md_write_start(struct mddev *mddev, struct bio *bi)
7202 if (bio_data_dir(bi) != WRITE)
7205 BUG_ON(mddev->ro == 1);
7206 if (mddev->ro == 2) {
7207 /* need to switch to read/write */
7209 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7210 md_wakeup_thread(mddev->thread);
7211 md_wakeup_thread(mddev->sync_thread);
7214 atomic_inc(&mddev->writes_pending);
7215 if (mddev->safemode == 1)
7216 mddev->safemode = 0;
7217 if (mddev->in_sync) {
7218 spin_lock_irq(&mddev->write_lock);
7219 if (mddev->in_sync) {
7221 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
7222 set_bit(MD_CHANGE_PENDING, &mddev->flags);
7223 md_wakeup_thread(mddev->thread);
7226 spin_unlock_irq(&mddev->write_lock);
7229 sysfs_notify_dirent_safe(mddev->sysfs_state);
7230 wait_event(mddev->sb_wait,
7231 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
7234 void md_write_end(struct mddev *mddev)
7236 if (atomic_dec_and_test(&mddev->writes_pending)) {
7237 if (mddev->safemode == 2)
7238 md_wakeup_thread(mddev->thread);
7239 else if (mddev->safemode_delay)
7240 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
7244 /* md_allow_write(mddev)
7245 * Calling this ensures that the array is marked 'active' so that writes
7246 * may proceed without blocking. It is important to call this before
7247 * attempting a GFP_KERNEL allocation while holding the mddev lock.
7248 * Must be called with mddev_lock held.
7250 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
7251 * is dropped, so return -EAGAIN after notifying userspace.
7253 int md_allow_write(struct mddev *mddev)
7259 if (!mddev->pers->sync_request)
7262 spin_lock_irq(&mddev->write_lock);
7263 if (mddev->in_sync) {
7265 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
7266 set_bit(MD_CHANGE_PENDING, &mddev->flags);
7267 if (mddev->safemode_delay &&
7268 mddev->safemode == 0)
7269 mddev->safemode = 1;
7270 spin_unlock_irq(&mddev->write_lock);
7271 md_update_sb(mddev, 0);
7272 sysfs_notify_dirent_safe(mddev->sysfs_state);
7274 spin_unlock_irq(&mddev->write_lock);
7276 if (test_bit(MD_CHANGE_PENDING, &mddev->flags))
7281 EXPORT_SYMBOL_GPL(md_allow_write);
7283 #define SYNC_MARKS 10
7284 #define SYNC_MARK_STEP (3*HZ)
7285 #define UPDATE_FREQUENCY (5*60*HZ)
7286 void md_do_sync(struct md_thread *thread)
7288 struct mddev *mddev = thread->mddev;
7289 struct mddev *mddev2;
7290 unsigned int currspeed = 0,
7292 sector_t max_sectors,j, io_sectors;
7293 unsigned long mark[SYNC_MARKS];
7294 unsigned long update_time;
7295 sector_t mark_cnt[SYNC_MARKS];
7297 struct list_head *tmp;
7298 sector_t last_check;
7300 struct md_rdev *rdev;
7302 struct blk_plug plug;
7304 /* just incase thread restarts... */
7305 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
7307 if (mddev->ro) /* never try to sync a read-only array */
7310 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
7311 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
7312 desc = "data-check";
7313 else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
7314 desc = "requested-resync";
7317 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
7322 /* we overload curr_resync somewhat here.
7323 * 0 == not engaged in resync at all
7324 * 2 == checking that there is no conflict with another sync
7325 * 1 == like 2, but have yielded to allow conflicting resync to
7327 * other == active in resync - this many blocks
7329 * Before starting a resync we must have set curr_resync to
7330 * 2, and then checked that every "conflicting" array has curr_resync
7331 * less than ours. When we find one that is the same or higher
7332 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
7333 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
7334 * This will mean we have to start checking from the beginning again.
7339 mddev->curr_resync = 2;
7342 if (kthread_should_stop())
7343 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7345 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
7347 for_each_mddev(mddev2, tmp) {
7348 if (mddev2 == mddev)
7350 if (!mddev->parallel_resync
7351 && mddev2->curr_resync
7352 && match_mddev_units(mddev, mddev2)) {
7354 if (mddev < mddev2 && mddev->curr_resync == 2) {
7355 /* arbitrarily yield */
7356 mddev->curr_resync = 1;
7357 wake_up(&resync_wait);
7359 if (mddev > mddev2 && mddev->curr_resync == 1)
7360 /* no need to wait here, we can wait the next
7361 * time 'round when curr_resync == 2
7364 /* We need to wait 'interruptible' so as not to
7365 * contribute to the load average, and not to
7366 * be caught by 'softlockup'
7368 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
7369 if (!kthread_should_stop() &&
7370 mddev2->curr_resync >= mddev->curr_resync) {
7371 printk(KERN_INFO "md: delaying %s of %s"
7372 " until %s has finished (they"
7373 " share one or more physical units)\n",
7374 desc, mdname(mddev), mdname(mddev2));
7376 if (signal_pending(current))
7377 flush_signals(current);
7379 finish_wait(&resync_wait, &wq);
7382 finish_wait(&resync_wait, &wq);
7385 } while (mddev->curr_resync < 2);
7388 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
7389 /* resync follows the size requested by the personality,
7390 * which defaults to physical size, but can be virtual size
7392 max_sectors = mddev->resync_max_sectors;
7393 atomic64_set(&mddev->resync_mismatches, 0);
7394 /* we don't use the checkpoint if there's a bitmap */
7395 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
7396 j = mddev->resync_min;
7397 else if (!mddev->bitmap)
7398 j = mddev->recovery_cp;
7400 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
7401 max_sectors = mddev->resync_max_sectors;
7403 /* recovery follows the physical size of devices */
7404 max_sectors = mddev->dev_sectors;
7407 rdev_for_each_rcu(rdev, mddev)
7408 if (rdev->raid_disk >= 0 &&
7409 !test_bit(Faulty, &rdev->flags) &&
7410 !test_bit(In_sync, &rdev->flags) &&
7411 rdev->recovery_offset < j)
7412 j = rdev->recovery_offset;
7416 printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev));
7417 printk(KERN_INFO "md: minimum _guaranteed_ speed:"
7418 " %d KB/sec/disk.\n", speed_min(mddev));
7419 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
7420 "(but not more than %d KB/sec) for %s.\n",
7421 speed_max(mddev), desc);
7423 is_mddev_idle(mddev, 1); /* this initializes IO event counters */
7426 for (m = 0; m < SYNC_MARKS; m++) {
7428 mark_cnt[m] = io_sectors;
7431 mddev->resync_mark = mark[last_mark];
7432 mddev->resync_mark_cnt = mark_cnt[last_mark];
7435 * Tune reconstruction:
7437 window = 32*(PAGE_SIZE/512);
7438 printk(KERN_INFO "md: using %dk window, over a total of %lluk.\n",
7439 window/2, (unsigned long long)max_sectors/2);
7441 atomic_set(&mddev->recovery_active, 0);
7446 "md: resuming %s of %s from checkpoint.\n",
7447 desc, mdname(mddev));
7448 mddev->curr_resync = j;
7450 mddev->curr_resync = 3; /* no longer delayed */
7451 mddev->curr_resync_completed = j;
7452 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
7453 md_new_event(mddev);
7454 update_time = jiffies;
7456 blk_start_plug(&plug);
7457 while (j < max_sectors) {
7462 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
7463 ((mddev->curr_resync > mddev->curr_resync_completed &&
7464 (mddev->curr_resync - mddev->curr_resync_completed)
7465 > (max_sectors >> 4)) ||
7466 time_after_eq(jiffies, update_time + UPDATE_FREQUENCY) ||
7467 (j - mddev->curr_resync_completed)*2
7468 >= mddev->resync_max - mddev->curr_resync_completed
7470 /* time to update curr_resync_completed */
7471 wait_event(mddev->recovery_wait,
7472 atomic_read(&mddev->recovery_active) == 0);
7473 mddev->curr_resync_completed = j;
7474 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) &&
7475 j > mddev->recovery_cp)
7476 mddev->recovery_cp = j;
7477 update_time = jiffies;
7478 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
7479 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
7482 while (j >= mddev->resync_max && !kthread_should_stop()) {
7483 /* As this condition is controlled by user-space,
7484 * we can block indefinitely, so use '_interruptible'
7485 * to avoid triggering warnings.
7487 flush_signals(current); /* just in case */
7488 wait_event_interruptible(mddev->recovery_wait,
7489 mddev->resync_max > j
7490 || kthread_should_stop());
7493 if (kthread_should_stop())
7496 sectors = mddev->pers->sync_request(mddev, j, &skipped,
7497 currspeed < speed_min(mddev));
7499 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7503 if (!skipped) { /* actual IO requested */
7504 io_sectors += sectors;
7505 atomic_add(sectors, &mddev->recovery_active);
7508 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
7513 mddev->curr_resync = j;
7514 mddev->curr_mark_cnt = io_sectors;
7515 if (last_check == 0)
7516 /* this is the earliest that rebuild will be
7517 * visible in /proc/mdstat
7519 md_new_event(mddev);
7521 if (last_check + window > io_sectors || j == max_sectors)
7524 last_check = io_sectors;
7526 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
7528 int next = (last_mark+1) % SYNC_MARKS;
7530 mddev->resync_mark = mark[next];
7531 mddev->resync_mark_cnt = mark_cnt[next];
7532 mark[next] = jiffies;
7533 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
7538 if (kthread_should_stop())
7543 * this loop exits only if either when we are slower than
7544 * the 'hard' speed limit, or the system was IO-idle for
7546 * the system might be non-idle CPU-wise, but we only care
7547 * about not overloading the IO subsystem. (things like an
7548 * e2fsck being done on the RAID array should execute fast)
7552 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
7553 /((jiffies-mddev->resync_mark)/HZ +1) +1;
7555 if (currspeed > speed_min(mddev)) {
7556 if ((currspeed > speed_max(mddev)) ||
7557 !is_mddev_idle(mddev, 0)) {
7563 printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc);
7565 * this also signals 'finished resyncing' to md_stop
7568 blk_finish_plug(&plug);
7569 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
7571 /* tell personality that we are finished */
7572 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
7574 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
7575 mddev->curr_resync > 2) {
7576 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
7577 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
7578 if (mddev->curr_resync >= mddev->recovery_cp) {
7580 "md: checkpointing %s of %s.\n",
7581 desc, mdname(mddev));
7582 if (test_bit(MD_RECOVERY_ERROR,
7584 mddev->recovery_cp =
7585 mddev->curr_resync_completed;
7587 mddev->recovery_cp =
7591 mddev->recovery_cp = MaxSector;
7593 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
7594 mddev->curr_resync = MaxSector;
7596 rdev_for_each_rcu(rdev, mddev)
7597 if (rdev->raid_disk >= 0 &&
7598 mddev->delta_disks >= 0 &&
7599 !test_bit(Faulty, &rdev->flags) &&
7600 !test_bit(In_sync, &rdev->flags) &&
7601 rdev->recovery_offset < mddev->curr_resync)
7602 rdev->recovery_offset = mddev->curr_resync;
7607 set_bit(MD_CHANGE_DEVS, &mddev->flags);
7609 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
7610 /* We completed so min/max setting can be forgotten if used. */
7611 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
7612 mddev->resync_min = 0;
7613 mddev->resync_max = MaxSector;
7614 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
7615 mddev->resync_min = mddev->curr_resync_completed;
7616 mddev->curr_resync = 0;
7617 wake_up(&resync_wait);
7618 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
7619 md_wakeup_thread(mddev->thread);
7624 * got a signal, exit.
7627 "md: md_do_sync() got signal ... exiting\n");
7628 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7632 EXPORT_SYMBOL_GPL(md_do_sync);
7634 static int remove_and_add_spares(struct mddev *mddev)
7636 struct md_rdev *rdev;
7640 rdev_for_each(rdev, mddev)
7641 if (rdev->raid_disk >= 0 &&
7642 !test_bit(Blocked, &rdev->flags) &&
7643 (test_bit(Faulty, &rdev->flags) ||
7644 ! test_bit(In_sync, &rdev->flags)) &&
7645 atomic_read(&rdev->nr_pending)==0) {
7646 if (mddev->pers->hot_remove_disk(
7647 mddev, rdev) == 0) {
7648 sysfs_unlink_rdev(mddev, rdev);
7649 rdev->raid_disk = -1;
7654 sysfs_notify(&mddev->kobj, NULL,
7658 rdev_for_each(rdev, mddev) {
7659 if (rdev->raid_disk >= 0 &&
7660 !test_bit(In_sync, &rdev->flags) &&
7661 !test_bit(Faulty, &rdev->flags))
7663 if (rdev->raid_disk < 0
7664 && !test_bit(Faulty, &rdev->flags)) {
7665 rdev->recovery_offset = 0;
7667 hot_add_disk(mddev, rdev) == 0) {
7668 if (sysfs_link_rdev(mddev, rdev))
7669 /* failure here is OK */;
7671 md_new_event(mddev);
7672 set_bit(MD_CHANGE_DEVS, &mddev->flags);
7677 set_bit(MD_CHANGE_DEVS, &mddev->flags);
7681 static void reap_sync_thread(struct mddev *mddev)
7683 struct md_rdev *rdev;
7685 /* resync has finished, collect result */
7686 md_unregister_thread(&mddev->sync_thread);
7687 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
7688 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
7690 /* activate any spares */
7691 if (mddev->pers->spare_active(mddev)) {
7692 sysfs_notify(&mddev->kobj, NULL,
7694 set_bit(MD_CHANGE_DEVS, &mddev->flags);
7697 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
7698 mddev->pers->finish_reshape)
7699 mddev->pers->finish_reshape(mddev);
7701 /* If array is no-longer degraded, then any saved_raid_disk
7702 * information must be scrapped. Also if any device is now
7703 * In_sync we must scrape the saved_raid_disk for that device
7704 * do the superblock for an incrementally recovered device
7707 rdev_for_each(rdev, mddev)
7708 if (!mddev->degraded ||
7709 test_bit(In_sync, &rdev->flags))
7710 rdev->saved_raid_disk = -1;
7712 md_update_sb(mddev, 1);
7713 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7714 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7715 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
7716 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
7717 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
7718 /* flag recovery needed just to double check */
7719 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7720 sysfs_notify_dirent_safe(mddev->sysfs_action);
7721 md_new_event(mddev);
7722 if (mddev->event_work.func)
7723 queue_work(md_misc_wq, &mddev->event_work);
7727 * This routine is regularly called by all per-raid-array threads to
7728 * deal with generic issues like resync and super-block update.
7729 * Raid personalities that don't have a thread (linear/raid0) do not
7730 * need this as they never do any recovery or update the superblock.
7732 * It does not do any resync itself, but rather "forks" off other threads
7733 * to do that as needed.
7734 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
7735 * "->recovery" and create a thread at ->sync_thread.
7736 * When the thread finishes it sets MD_RECOVERY_DONE
7737 * and wakeups up this thread which will reap the thread and finish up.
7738 * This thread also removes any faulty devices (with nr_pending == 0).
7740 * The overall approach is:
7741 * 1/ if the superblock needs updating, update it.
7742 * 2/ If a recovery thread is running, don't do anything else.
7743 * 3/ If recovery has finished, clean up, possibly marking spares active.
7744 * 4/ If there are any faulty devices, remove them.
7745 * 5/ If array is degraded, try to add spares devices
7746 * 6/ If array has spares or is not in-sync, start a resync thread.
7748 void md_check_recovery(struct mddev *mddev)
7750 if (mddev->suspended)
7754 bitmap_daemon_work(mddev);
7756 if (signal_pending(current)) {
7757 if (mddev->pers->sync_request && !mddev->external) {
7758 printk(KERN_INFO "md: %s in immediate safe mode\n",
7760 mddev->safemode = 2;
7762 flush_signals(current);
7765 if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
7768 (mddev->flags & ~ (1<<MD_CHANGE_PENDING)) ||
7769 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
7770 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
7771 (mddev->external == 0 && mddev->safemode == 1) ||
7772 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
7773 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
7777 if (mddev_trylock(mddev)) {
7781 /* Only thing we do on a ro array is remove
7784 struct md_rdev *rdev;
7785 rdev_for_each(rdev, mddev)
7786 if (rdev->raid_disk >= 0 &&
7787 !test_bit(Blocked, &rdev->flags) &&
7788 test_bit(Faulty, &rdev->flags) &&
7789 atomic_read(&rdev->nr_pending)==0) {
7790 if (mddev->pers->hot_remove_disk(
7791 mddev, rdev) == 0) {
7792 sysfs_unlink_rdev(mddev, rdev);
7793 rdev->raid_disk = -1;
7796 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7800 if (!mddev->external) {
7802 spin_lock_irq(&mddev->write_lock);
7803 if (mddev->safemode &&
7804 !atomic_read(&mddev->writes_pending) &&
7806 mddev->recovery_cp == MaxSector) {
7809 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
7811 if (mddev->safemode == 1)
7812 mddev->safemode = 0;
7813 spin_unlock_irq(&mddev->write_lock);
7815 sysfs_notify_dirent_safe(mddev->sysfs_state);
7819 md_update_sb(mddev, 0);
7821 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
7822 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
7823 /* resync/recovery still happening */
7824 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7827 if (mddev->sync_thread) {
7828 reap_sync_thread(mddev);
7831 /* Set RUNNING before clearing NEEDED to avoid
7832 * any transients in the value of "sync_action".
7834 mddev->curr_resync_completed = 0;
7835 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7836 /* Clear some bits that don't mean anything, but
7839 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
7840 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
7842 if (!test_and_clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
7843 test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
7845 /* no recovery is running.
7846 * remove any failed drives, then
7847 * add spares if possible.
7848 * Spares are also removed and re-added, to allow
7849 * the personality to fail the re-add.
7852 if (mddev->reshape_position != MaxSector) {
7853 if (mddev->pers->check_reshape == NULL ||
7854 mddev->pers->check_reshape(mddev) != 0)
7855 /* Cannot proceed */
7857 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
7858 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7859 } else if ((spares = remove_and_add_spares(mddev))) {
7860 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7861 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
7862 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
7863 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7864 } else if (mddev->recovery_cp < MaxSector) {
7865 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7866 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7867 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
7868 /* nothing to be done ... */
7871 if (mddev->pers->sync_request) {
7873 /* We are adding a device or devices to an array
7874 * which has the bitmap stored on all devices.
7875 * So make sure all bitmap pages get written
7877 bitmap_write_all(mddev->bitmap);
7879 mddev->sync_thread = md_register_thread(md_do_sync,
7882 if (!mddev->sync_thread) {
7883 printk(KERN_ERR "%s: could not start resync"
7886 /* leave the spares where they are, it shouldn't hurt */
7887 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7888 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7889 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
7890 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
7891 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
7893 md_wakeup_thread(mddev->sync_thread);
7894 sysfs_notify_dirent_safe(mddev->sysfs_action);
7895 md_new_event(mddev);
7898 if (!mddev->sync_thread) {
7899 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7900 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
7902 if (mddev->sysfs_action)
7903 sysfs_notify_dirent_safe(mddev->sysfs_action);
7905 mddev_unlock(mddev);
7909 void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev)
7911 sysfs_notify_dirent_safe(rdev->sysfs_state);
7912 wait_event_timeout(rdev->blocked_wait,
7913 !test_bit(Blocked, &rdev->flags) &&
7914 !test_bit(BlockedBadBlocks, &rdev->flags),
7915 msecs_to_jiffies(5000));
7916 rdev_dec_pending(rdev, mddev);
7918 EXPORT_SYMBOL(md_wait_for_blocked_rdev);
7920 void md_finish_reshape(struct mddev *mddev)
7922 /* called be personality module when reshape completes. */
7923 struct md_rdev *rdev;
7925 rdev_for_each(rdev, mddev) {
7926 if (rdev->data_offset > rdev->new_data_offset)
7927 rdev->sectors += rdev->data_offset - rdev->new_data_offset;
7929 rdev->sectors -= rdev->new_data_offset - rdev->data_offset;
7930 rdev->data_offset = rdev->new_data_offset;
7933 EXPORT_SYMBOL(md_finish_reshape);
7935 /* Bad block management.
7936 * We can record which blocks on each device are 'bad' and so just
7937 * fail those blocks, or that stripe, rather than the whole device.
7938 * Entries in the bad-block table are 64bits wide. This comprises:
7939 * Length of bad-range, in sectors: 0-511 for lengths 1-512
7940 * Start of bad-range, sector offset, 54 bits (allows 8 exbibytes)
7941 * A 'shift' can be set so that larger blocks are tracked and
7942 * consequently larger devices can be covered.
7943 * 'Acknowledged' flag - 1 bit. - the most significant bit.
7945 * Locking of the bad-block table uses a seqlock so md_is_badblock
7946 * might need to retry if it is very unlucky.
7947 * We will sometimes want to check for bad blocks in a bi_end_io function,
7948 * so we use the write_seqlock_irq variant.
7950 * When looking for a bad block we specify a range and want to
7951 * know if any block in the range is bad. So we binary-search
7952 * to the last range that starts at-or-before the given endpoint,
7953 * (or "before the sector after the target range")
7954 * then see if it ends after the given start.
7956 * 0 if there are no known bad blocks in the range
7957 * 1 if there are known bad block which are all acknowledged
7958 * -1 if there are bad blocks which have not yet been acknowledged in metadata.
7959 * plus the start/length of the first bad section we overlap.
7961 int md_is_badblock(struct badblocks *bb, sector_t s, int sectors,
7962 sector_t *first_bad, int *bad_sectors)
7968 sector_t target = s + sectors;
7971 if (bb->shift > 0) {
7972 /* round the start down, and the end up */
7974 target += (1<<bb->shift) - 1;
7975 target >>= bb->shift;
7976 sectors = target - s;
7978 /* 'target' is now the first block after the bad range */
7981 seq = read_seqbegin(&bb->lock);
7986 /* Binary search between lo and hi for 'target'
7987 * i.e. for the last range that starts before 'target'
7989 /* INVARIANT: ranges before 'lo' and at-or-after 'hi'
7990 * are known not to be the last range before target.
7991 * VARIANT: hi-lo is the number of possible
7992 * ranges, and decreases until it reaches 1
7994 while (hi - lo > 1) {
7995 int mid = (lo + hi) / 2;
7996 sector_t a = BB_OFFSET(p[mid]);
7998 /* This could still be the one, earlier ranges
8002 /* This and later ranges are definitely out. */
8005 /* 'lo' might be the last that started before target, but 'hi' isn't */
8007 /* need to check all range that end after 's' to see if
8008 * any are unacknowledged.
8011 BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) {
8012 if (BB_OFFSET(p[lo]) < target) {
8013 /* starts before the end, and finishes after
8014 * the start, so they must overlap
8016 if (rv != -1 && BB_ACK(p[lo]))
8020 *first_bad = BB_OFFSET(p[lo]);
8021 *bad_sectors = BB_LEN(p[lo]);
8027 if (read_seqretry(&bb->lock, seq))
8032 EXPORT_SYMBOL_GPL(md_is_badblock);
8035 * Add a range of bad blocks to the table.
8036 * This might extend the table, or might contract it
8037 * if two adjacent ranges can be merged.
8038 * We binary-search to find the 'insertion' point, then
8039 * decide how best to handle it.
8041 static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors,
8049 /* badblocks are disabled */
8053 /* round the start down, and the end up */
8054 sector_t next = s + sectors;
8056 next += (1<<bb->shift) - 1;
8061 write_seqlock_irq(&bb->lock);
8066 /* Find the last range that starts at-or-before 's' */
8067 while (hi - lo > 1) {
8068 int mid = (lo + hi) / 2;
8069 sector_t a = BB_OFFSET(p[mid]);
8075 if (hi > lo && BB_OFFSET(p[lo]) > s)
8079 /* we found a range that might merge with the start
8082 sector_t a = BB_OFFSET(p[lo]);
8083 sector_t e = a + BB_LEN(p[lo]);
8084 int ack = BB_ACK(p[lo]);
8086 /* Yes, we can merge with a previous range */
8087 if (s == a && s + sectors >= e)
8088 /* new range covers old */
8091 ack = ack && acknowledged;
8093 if (e < s + sectors)
8095 if (e - a <= BB_MAX_LEN) {
8096 p[lo] = BB_MAKE(a, e-a, ack);
8099 /* does not all fit in one range,
8100 * make p[lo] maximal
8102 if (BB_LEN(p[lo]) != BB_MAX_LEN)
8103 p[lo] = BB_MAKE(a, BB_MAX_LEN, ack);
8109 if (sectors && hi < bb->count) {
8110 /* 'hi' points to the first range that starts after 's'.
8111 * Maybe we can merge with the start of that range */
8112 sector_t a = BB_OFFSET(p[hi]);
8113 sector_t e = a + BB_LEN(p[hi]);
8114 int ack = BB_ACK(p[hi]);
8115 if (a <= s + sectors) {
8116 /* merging is possible */
8117 if (e <= s + sectors) {
8122 ack = ack && acknowledged;
8125 if (e - a <= BB_MAX_LEN) {
8126 p[hi] = BB_MAKE(a, e-a, ack);
8129 p[hi] = BB_MAKE(a, BB_MAX_LEN, ack);
8137 if (sectors == 0 && hi < bb->count) {
8138 /* we might be able to combine lo and hi */
8139 /* Note: 's' is at the end of 'lo' */
8140 sector_t a = BB_OFFSET(p[hi]);
8141 int lolen = BB_LEN(p[lo]);
8142 int hilen = BB_LEN(p[hi]);
8143 int newlen = lolen + hilen - (s - a);
8144 if (s >= a && newlen < BB_MAX_LEN) {
8145 /* yes, we can combine them */
8146 int ack = BB_ACK(p[lo]) && BB_ACK(p[hi]);
8147 p[lo] = BB_MAKE(BB_OFFSET(p[lo]), newlen, ack);
8148 memmove(p + hi, p + hi + 1,
8149 (bb->count - hi - 1) * 8);
8154 /* didn't merge (it all).
8155 * Need to add a range just before 'hi' */
8156 if (bb->count >= MD_MAX_BADBLOCKS) {
8157 /* No room for more */
8161 int this_sectors = sectors;
8162 memmove(p + hi + 1, p + hi,
8163 (bb->count - hi) * 8);
8166 if (this_sectors > BB_MAX_LEN)
8167 this_sectors = BB_MAX_LEN;
8168 p[hi] = BB_MAKE(s, this_sectors, acknowledged);
8169 sectors -= this_sectors;
8176 bb->unacked_exist = 1;
8177 write_sequnlock_irq(&bb->lock);
8182 int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
8187 s += rdev->new_data_offset;
8189 s += rdev->data_offset;
8190 rv = md_set_badblocks(&rdev->badblocks,
8193 /* Make sure they get written out promptly */
8194 sysfs_notify_dirent_safe(rdev->sysfs_state);
8195 set_bit(MD_CHANGE_CLEAN, &rdev->mddev->flags);
8196 md_wakeup_thread(rdev->mddev->thread);
8200 EXPORT_SYMBOL_GPL(rdev_set_badblocks);
8203 * Remove a range of bad blocks from the table.
8204 * This may involve extending the table if we spilt a region,
8205 * but it must not fail. So if the table becomes full, we just
8206 * drop the remove request.
8208 static int md_clear_badblocks(struct badblocks *bb, sector_t s, int sectors)
8212 sector_t target = s + sectors;
8215 if (bb->shift > 0) {
8216 /* When clearing we round the start up and the end down.
8217 * This should not matter as the shift should align with
8218 * the block size and no rounding should ever be needed.
8219 * However it is better the think a block is bad when it
8220 * isn't than to think a block is not bad when it is.
8222 s += (1<<bb->shift) - 1;
8224 target >>= bb->shift;
8225 sectors = target - s;
8228 write_seqlock_irq(&bb->lock);
8233 /* Find the last range that starts before 'target' */
8234 while (hi - lo > 1) {
8235 int mid = (lo + hi) / 2;
8236 sector_t a = BB_OFFSET(p[mid]);
8243 /* p[lo] is the last range that could overlap the
8244 * current range. Earlier ranges could also overlap,
8245 * but only this one can overlap the end of the range.
8247 if (BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > target) {
8248 /* Partial overlap, leave the tail of this range */
8249 int ack = BB_ACK(p[lo]);
8250 sector_t a = BB_OFFSET(p[lo]);
8251 sector_t end = a + BB_LEN(p[lo]);
8254 /* we need to split this range */
8255 if (bb->count >= MD_MAX_BADBLOCKS) {
8259 memmove(p+lo+1, p+lo, (bb->count - lo) * 8);
8261 p[lo] = BB_MAKE(a, s-a, ack);
8264 p[lo] = BB_MAKE(target, end - target, ack);
8265 /* there is no longer an overlap */
8270 BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) {
8271 /* This range does overlap */
8272 if (BB_OFFSET(p[lo]) < s) {
8273 /* Keep the early parts of this range. */
8274 int ack = BB_ACK(p[lo]);
8275 sector_t start = BB_OFFSET(p[lo]);
8276 p[lo] = BB_MAKE(start, s - start, ack);
8277 /* now low doesn't overlap, so.. */
8282 /* 'lo' is strictly before, 'hi' is strictly after,
8283 * anything between needs to be discarded
8286 memmove(p+lo+1, p+hi, (bb->count - hi) * 8);
8287 bb->count -= (hi - lo - 1);
8293 write_sequnlock_irq(&bb->lock);
8297 int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
8301 s += rdev->new_data_offset;
8303 s += rdev->data_offset;
8304 return md_clear_badblocks(&rdev->badblocks,
8307 EXPORT_SYMBOL_GPL(rdev_clear_badblocks);
8310 * Acknowledge all bad blocks in a list.
8311 * This only succeeds if ->changed is clear. It is used by
8312 * in-kernel metadata updates
8314 void md_ack_all_badblocks(struct badblocks *bb)
8316 if (bb->page == NULL || bb->changed)
8317 /* no point even trying */
8319 write_seqlock_irq(&bb->lock);
8321 if (bb->changed == 0 && bb->unacked_exist) {
8324 for (i = 0; i < bb->count ; i++) {
8325 if (!BB_ACK(p[i])) {
8326 sector_t start = BB_OFFSET(p[i]);
8327 int len = BB_LEN(p[i]);
8328 p[i] = BB_MAKE(start, len, 1);
8331 bb->unacked_exist = 0;
8333 write_sequnlock_irq(&bb->lock);
8335 EXPORT_SYMBOL_GPL(md_ack_all_badblocks);
8337 /* sysfs access to bad-blocks list.
8338 * We present two files.
8339 * 'bad-blocks' lists sector numbers and lengths of ranges that
8340 * are recorded as bad. The list is truncated to fit within
8341 * the one-page limit of sysfs.
8342 * Writing "sector length" to this file adds an acknowledged
8344 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
8345 * been acknowledged. Writing to this file adds bad blocks
8346 * without acknowledging them. This is largely for testing.
8350 badblocks_show(struct badblocks *bb, char *page, int unack)
8361 seq = read_seqbegin(&bb->lock);
8366 while (len < PAGE_SIZE && i < bb->count) {
8367 sector_t s = BB_OFFSET(p[i]);
8368 unsigned int length = BB_LEN(p[i]);
8369 int ack = BB_ACK(p[i]);
8375 len += snprintf(page+len, PAGE_SIZE-len, "%llu %u\n",
8376 (unsigned long long)s << bb->shift,
8377 length << bb->shift);
8379 if (unack && len == 0)
8380 bb->unacked_exist = 0;
8382 if (read_seqretry(&bb->lock, seq))
8391 badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack)
8393 unsigned long long sector;
8397 /* Allow clearing via sysfs *only* for testing/debugging.
8398 * Normally only a successful write may clear a badblock
8401 if (page[0] == '-') {
8405 #endif /* DO_DEBUG */
8407 switch (sscanf(page, "%llu %d%c", §or, &length, &newline)) {
8409 if (newline != '\n')
8421 md_clear_badblocks(bb, sector, length);
8424 #endif /* DO_DEBUG */
8425 if (md_set_badblocks(bb, sector, length, !unack))
8431 static int md_notify_reboot(struct notifier_block *this,
8432 unsigned long code, void *x)
8434 struct list_head *tmp;
8435 struct mddev *mddev;
8438 for_each_mddev(mddev, tmp) {
8439 if (mddev_trylock(mddev)) {
8441 __md_stop_writes(mddev);
8442 mddev->safemode = 2;
8443 mddev_unlock(mddev);
8448 * certain more exotic SCSI devices are known to be
8449 * volatile wrt too early system reboots. While the
8450 * right place to handle this issue is the given
8451 * driver, we do want to have a safe RAID driver ...
8459 static struct notifier_block md_notifier = {
8460 .notifier_call = md_notify_reboot,
8462 .priority = INT_MAX, /* before any real devices */
8465 static void md_geninit(void)
8467 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
8469 proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops);
8472 static int __init md_init(void)
8476 md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0);
8480 md_misc_wq = alloc_workqueue("md_misc", 0, 0);
8484 if ((ret = register_blkdev(MD_MAJOR, "md")) < 0)
8487 if ((ret = register_blkdev(0, "mdp")) < 0)
8491 blk_register_region(MKDEV(MD_MAJOR, 0), 1UL<<MINORBITS, THIS_MODULE,
8492 md_probe, NULL, NULL);
8493 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
8494 md_probe, NULL, NULL);
8496 register_reboot_notifier(&md_notifier);
8497 raid_table_header = register_sysctl_table(raid_root_table);
8503 unregister_blkdev(MD_MAJOR, "md");
8505 destroy_workqueue(md_misc_wq);
8507 destroy_workqueue(md_wq);
8515 * Searches all registered partitions for autorun RAID arrays
8519 static LIST_HEAD(all_detected_devices);
8520 struct detected_devices_node {
8521 struct list_head list;
8525 void md_autodetect_dev(dev_t dev)
8527 struct detected_devices_node *node_detected_dev;
8529 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
8530 if (node_detected_dev) {
8531 node_detected_dev->dev = dev;
8532 list_add_tail(&node_detected_dev->list, &all_detected_devices);
8534 printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed"
8535 ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev));
8540 static void autostart_arrays(int part)
8542 struct md_rdev *rdev;
8543 struct detected_devices_node *node_detected_dev;
8545 int i_scanned, i_passed;
8550 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
8552 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
8554 node_detected_dev = list_entry(all_detected_devices.next,
8555 struct detected_devices_node, list);
8556 list_del(&node_detected_dev->list);
8557 dev = node_detected_dev->dev;
8558 kfree(node_detected_dev);
8559 rdev = md_import_device(dev,0, 90);
8563 if (test_bit(Faulty, &rdev->flags)) {
8567 set_bit(AutoDetected, &rdev->flags);
8568 list_add(&rdev->same_set, &pending_raid_disks);
8572 printk(KERN_INFO "md: Scanned %d and added %d devices.\n",
8573 i_scanned, i_passed);
8575 autorun_devices(part);
8578 #endif /* !MODULE */
8580 static __exit void md_exit(void)
8582 struct mddev *mddev;
8583 struct list_head *tmp;
8585 blk_unregister_region(MKDEV(MD_MAJOR,0), 1U << MINORBITS);
8586 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
8588 unregister_blkdev(MD_MAJOR,"md");
8589 unregister_blkdev(mdp_major, "mdp");
8590 unregister_reboot_notifier(&md_notifier);
8591 unregister_sysctl_table(raid_table_header);
8592 remove_proc_entry("mdstat", NULL);
8593 for_each_mddev(mddev, tmp) {
8594 export_array(mddev);
8595 mddev->hold_active = 0;
8597 destroy_workqueue(md_misc_wq);
8598 destroy_workqueue(md_wq);
8601 subsys_initcall(md_init);
8602 module_exit(md_exit)
8604 static int get_ro(char *buffer, struct kernel_param *kp)
8606 return sprintf(buffer, "%d", start_readonly);
8608 static int set_ro(const char *val, struct kernel_param *kp)
8611 int num = simple_strtoul(val, &e, 10);
8612 if (*val && (*e == '\0' || *e == '\n')) {
8613 start_readonly = num;
8619 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
8620 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
8622 module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR);
8624 EXPORT_SYMBOL(register_md_personality);
8625 EXPORT_SYMBOL(unregister_md_personality);
8626 EXPORT_SYMBOL(md_error);
8627 EXPORT_SYMBOL(md_done_sync);
8628 EXPORT_SYMBOL(md_write_start);
8629 EXPORT_SYMBOL(md_write_end);
8630 EXPORT_SYMBOL(md_register_thread);
8631 EXPORT_SYMBOL(md_unregister_thread);
8632 EXPORT_SYMBOL(md_wakeup_thread);
8633 EXPORT_SYMBOL(md_check_recovery);
8634 MODULE_LICENSE("GPL");
8635 MODULE_DESCRIPTION("MD RAID framework");
8637 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);