2 md.c : Multiple Devices driver for Linux
3 Copyright (C) 1998, 1999, 2000 Ingo Molnar
5 completely rewritten, based on the MD driver code from Marc Zyngier
9 - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar
10 - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com>
11 - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net>
12 - kerneld support by Boris Tobotras <boris@xtalk.msk.su>
13 - kmod support by: Cyrus Durgin
14 - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com>
15 - Devfs support by Richard Gooch <rgooch@atnf.csiro.au>
17 - lots of fixes and improvements to the RAID1/RAID5 and generic
18 RAID code (such as request based resynchronization):
20 Neil Brown <neilb@cse.unsw.edu.au>.
22 - persistent bitmap code
23 Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.
25 This program is free software; you can redistribute it and/or modify
26 it under the terms of the GNU General Public License as published by
27 the Free Software Foundation; either version 2, or (at your option)
30 You should have received a copy of the GNU General Public License
31 (for example /usr/src/linux/COPYING); if not, write to the Free
32 Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
35 #include <linux/kthread.h>
36 #include <linux/blkdev.h>
37 #include <linux/sysctl.h>
38 #include <linux/seq_file.h>
39 #include <linux/mutex.h>
40 #include <linux/buffer_head.h> /* for invalidate_bdev */
41 #include <linux/poll.h>
42 #include <linux/ctype.h>
43 #include <linux/string.h>
44 #include <linux/hdreg.h>
45 #include <linux/proc_fs.h>
46 #include <linux/random.h>
47 #include <linux/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 #define dprintk(x...) ((void)(DEBUG && printk(x)))
61 static void autostart_arrays(int part);
64 /* pers_list is a list of registered personalities protected
66 * pers_lock does extra service to protect accesses to
67 * mddev->thread when the mutex cannot be held.
69 static LIST_HEAD(pers_list);
70 static DEFINE_SPINLOCK(pers_lock);
72 static void md_print_devices(void);
74 static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
75 static struct workqueue_struct *md_wq;
76 static struct workqueue_struct *md_misc_wq;
78 #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
81 * Default number of read corrections we'll attempt on an rdev
82 * before ejecting it from the array. We divide the read error
83 * count by 2 for every hour elapsed between read errors.
85 #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
87 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
88 * is 1000 KB/sec, so the extra system load does not show up that much.
89 * Increase it if you want to have more _guaranteed_ speed. Note that
90 * the RAID driver will use the maximum available bandwidth if the IO
91 * subsystem is idle. There is also an 'absolute maximum' reconstruction
92 * speed limit - in case reconstruction slows down your system despite
95 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
96 * or /sys/block/mdX/md/sync_speed_{min,max}
99 static int sysctl_speed_limit_min = 1000;
100 static int sysctl_speed_limit_max = 200000;
101 static inline int speed_min(mddev_t *mddev)
103 return mddev->sync_speed_min ?
104 mddev->sync_speed_min : sysctl_speed_limit_min;
107 static inline int speed_max(mddev_t *mddev)
109 return mddev->sync_speed_max ?
110 mddev->sync_speed_max : sysctl_speed_limit_max;
113 static struct ctl_table_header *raid_table_header;
115 static ctl_table raid_table[] = {
117 .procname = "speed_limit_min",
118 .data = &sysctl_speed_limit_min,
119 .maxlen = sizeof(int),
120 .mode = S_IRUGO|S_IWUSR,
121 .proc_handler = proc_dointvec,
124 .procname = "speed_limit_max",
125 .data = &sysctl_speed_limit_max,
126 .maxlen = sizeof(int),
127 .mode = S_IRUGO|S_IWUSR,
128 .proc_handler = proc_dointvec,
133 static ctl_table raid_dir_table[] = {
137 .mode = S_IRUGO|S_IXUGO,
143 static ctl_table raid_root_table[] = {
148 .child = raid_dir_table,
153 static const struct block_device_operations md_fops;
155 static int start_readonly;
158 * like bio_clone, but with a local bio set
161 static void mddev_bio_destructor(struct bio *bio)
163 mddev_t *mddev, **mddevp;
168 bio_free(bio, mddev->bio_set);
171 struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs,
177 if (!mddev || !mddev->bio_set)
178 return bio_alloc(gfp_mask, nr_iovecs);
180 b = bio_alloc_bioset(gfp_mask, nr_iovecs,
186 b->bi_destructor = mddev_bio_destructor;
189 EXPORT_SYMBOL_GPL(bio_alloc_mddev);
191 struct bio *bio_clone_mddev(struct bio *bio, gfp_t gfp_mask,
197 if (!mddev || !mddev->bio_set)
198 return bio_clone(bio, gfp_mask);
200 b = bio_alloc_bioset(gfp_mask, bio->bi_max_vecs,
206 b->bi_destructor = mddev_bio_destructor;
208 if (bio_integrity(bio)) {
211 ret = bio_integrity_clone(b, bio, gfp_mask, mddev->bio_set);
221 EXPORT_SYMBOL_GPL(bio_clone_mddev);
224 * We have a system wide 'event count' that is incremented
225 * on any 'interesting' event, and readers of /proc/mdstat
226 * can use 'poll' or 'select' to find out when the event
230 * start array, stop array, error, add device, remove device,
231 * start build, activate spare
233 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
234 static atomic_t md_event_count;
235 void md_new_event(mddev_t *mddev)
237 atomic_inc(&md_event_count);
238 wake_up(&md_event_waiters);
240 EXPORT_SYMBOL_GPL(md_new_event);
242 /* Alternate version that can be called from interrupts
243 * when calling sysfs_notify isn't needed.
245 static void md_new_event_inintr(mddev_t *mddev)
247 atomic_inc(&md_event_count);
248 wake_up(&md_event_waiters);
252 * Enables to iterate over all existing md arrays
253 * all_mddevs_lock protects this list.
255 static LIST_HEAD(all_mddevs);
256 static DEFINE_SPINLOCK(all_mddevs_lock);
260 * iterates through all used mddevs in the system.
261 * We take care to grab the all_mddevs_lock whenever navigating
262 * the list, and to always hold a refcount when unlocked.
263 * Any code which breaks out of this loop while own
264 * a reference to the current mddev and must mddev_put it.
266 #define for_each_mddev(mddev,tmp) \
268 for (({ spin_lock(&all_mddevs_lock); \
269 tmp = all_mddevs.next; \
271 ({ if (tmp != &all_mddevs) \
272 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
273 spin_unlock(&all_mddevs_lock); \
274 if (mddev) mddev_put(mddev); \
275 mddev = list_entry(tmp, mddev_t, all_mddevs); \
276 tmp != &all_mddevs;}); \
277 ({ spin_lock(&all_mddevs_lock); \
282 /* Rather than calling directly into the personality make_request function,
283 * IO requests come here first so that we can check if the device is
284 * being suspended pending a reconfiguration.
285 * We hold a refcount over the call to ->make_request. By the time that
286 * call has finished, the bio has been linked into some internal structure
287 * and so is visible to ->quiesce(), so we don't need the refcount any more.
289 static int md_make_request(struct request_queue *q, struct bio *bio)
291 const int rw = bio_data_dir(bio);
292 mddev_t *mddev = q->queuedata;
295 unsigned int sectors;
297 if (mddev == NULL || mddev->pers == NULL
302 smp_rmb(); /* Ensure implications of 'active' are visible */
304 if (mddev->suspended) {
307 prepare_to_wait(&mddev->sb_wait, &__wait,
308 TASK_UNINTERRUPTIBLE);
309 if (!mddev->suspended)
315 finish_wait(&mddev->sb_wait, &__wait);
317 atomic_inc(&mddev->active_io);
321 * save the sectors now since our bio can
322 * go away inside make_request
324 sectors = bio_sectors(bio);
325 rv = mddev->pers->make_request(mddev, bio);
327 cpu = part_stat_lock();
328 part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]);
329 part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw], sectors);
332 if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended)
333 wake_up(&mddev->sb_wait);
338 /* mddev_suspend makes sure no new requests are submitted
339 * to the device, and that any requests that have been submitted
340 * are completely handled.
341 * Once ->stop is called and completes, the module will be completely
344 void mddev_suspend(mddev_t *mddev)
346 BUG_ON(mddev->suspended);
347 mddev->suspended = 1;
349 wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0);
350 mddev->pers->quiesce(mddev, 1);
352 EXPORT_SYMBOL_GPL(mddev_suspend);
354 void mddev_resume(mddev_t *mddev)
356 mddev->suspended = 0;
357 wake_up(&mddev->sb_wait);
358 mddev->pers->quiesce(mddev, 0);
360 md_wakeup_thread(mddev->thread);
361 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
363 EXPORT_SYMBOL_GPL(mddev_resume);
365 int mddev_congested(mddev_t *mddev, int bits)
367 return mddev->suspended;
369 EXPORT_SYMBOL(mddev_congested);
372 * Generic flush handling for md
375 static void md_end_flush(struct bio *bio, int err)
377 mdk_rdev_t *rdev = bio->bi_private;
378 mddev_t *mddev = rdev->mddev;
380 rdev_dec_pending(rdev, mddev);
382 if (atomic_dec_and_test(&mddev->flush_pending)) {
383 /* The pre-request flush has finished */
384 queue_work(md_wq, &mddev->flush_work);
389 static void md_submit_flush_data(struct work_struct *ws);
391 static void submit_flushes(struct work_struct *ws)
393 mddev_t *mddev = container_of(ws, mddev_t, flush_work);
396 INIT_WORK(&mddev->flush_work, md_submit_flush_data);
397 atomic_set(&mddev->flush_pending, 1);
399 list_for_each_entry_rcu(rdev, &mddev->disks, same_set)
400 if (rdev->raid_disk >= 0 &&
401 !test_bit(Faulty, &rdev->flags)) {
402 /* Take two references, one is dropped
403 * when request finishes, one after
404 * we reclaim rcu_read_lock
407 atomic_inc(&rdev->nr_pending);
408 atomic_inc(&rdev->nr_pending);
410 bi = bio_alloc_mddev(GFP_KERNEL, 0, mddev);
411 bi->bi_end_io = md_end_flush;
412 bi->bi_private = rdev;
413 bi->bi_bdev = rdev->bdev;
414 atomic_inc(&mddev->flush_pending);
415 submit_bio(WRITE_FLUSH, bi);
417 rdev_dec_pending(rdev, mddev);
420 if (atomic_dec_and_test(&mddev->flush_pending))
421 queue_work(md_wq, &mddev->flush_work);
424 static void md_submit_flush_data(struct work_struct *ws)
426 mddev_t *mddev = container_of(ws, mddev_t, flush_work);
427 struct bio *bio = mddev->flush_bio;
429 if (bio->bi_size == 0)
430 /* an empty barrier - all done */
433 bio->bi_rw &= ~REQ_FLUSH;
434 if (mddev->pers->make_request(mddev, bio))
435 generic_make_request(bio);
438 mddev->flush_bio = NULL;
439 wake_up(&mddev->sb_wait);
442 void md_flush_request(mddev_t *mddev, struct bio *bio)
444 spin_lock_irq(&mddev->write_lock);
445 wait_event_lock_irq(mddev->sb_wait,
447 mddev->write_lock, /*nothing*/);
448 mddev->flush_bio = bio;
449 spin_unlock_irq(&mddev->write_lock);
451 INIT_WORK(&mddev->flush_work, submit_flushes);
452 queue_work(md_wq, &mddev->flush_work);
454 EXPORT_SYMBOL(md_flush_request);
456 /* Support for plugging.
457 * This mirrors the plugging support in request_queue, but does not
458 * require having a whole queue or request structures.
459 * We allocate an md_plug_cb for each md device and each thread it gets
460 * plugged on. This links tot the private plug_handle structure in the
461 * personality data where we keep a count of the number of outstanding
462 * plugs so other code can see if a plug is active.
465 struct blk_plug_cb cb;
469 static void plugger_unplug(struct blk_plug_cb *cb)
471 struct md_plug_cb *mdcb = container_of(cb, struct md_plug_cb, cb);
472 if (atomic_dec_and_test(&mdcb->mddev->plug_cnt))
473 md_wakeup_thread(mdcb->mddev->thread);
477 /* Check that an unplug wakeup will come shortly.
478 * If not, wakeup the md thread immediately
480 int mddev_check_plugged(mddev_t *mddev)
482 struct blk_plug *plug = current->plug;
483 struct md_plug_cb *mdcb;
488 list_for_each_entry(mdcb, &plug->cb_list, cb.list) {
489 if (mdcb->cb.callback == plugger_unplug &&
490 mdcb->mddev == mddev) {
491 /* Already on the list, move to top */
492 if (mdcb != list_first_entry(&plug->cb_list,
495 list_move(&mdcb->cb.list, &plug->cb_list);
499 /* Not currently on the callback list */
500 mdcb = kmalloc(sizeof(*mdcb), GFP_ATOMIC);
505 mdcb->cb.callback = plugger_unplug;
506 atomic_inc(&mddev->plug_cnt);
507 list_add(&mdcb->cb.list, &plug->cb_list);
510 EXPORT_SYMBOL_GPL(mddev_check_plugged);
512 static inline mddev_t *mddev_get(mddev_t *mddev)
514 atomic_inc(&mddev->active);
518 static void mddev_delayed_delete(struct work_struct *ws);
520 static void mddev_put(mddev_t *mddev)
522 struct bio_set *bs = NULL;
524 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
526 if (!mddev->raid_disks && list_empty(&mddev->disks) &&
527 mddev->ctime == 0 && !mddev->hold_active) {
528 /* Array is not configured at all, and not held active,
530 list_del(&mddev->all_mddevs);
532 mddev->bio_set = NULL;
533 if (mddev->gendisk) {
534 /* We did a probe so need to clean up. Call
535 * queue_work inside the spinlock so that
536 * flush_workqueue() after mddev_find will
537 * succeed in waiting for the work to be done.
539 INIT_WORK(&mddev->del_work, mddev_delayed_delete);
540 queue_work(md_misc_wq, &mddev->del_work);
544 spin_unlock(&all_mddevs_lock);
549 void mddev_init(mddev_t *mddev)
551 mutex_init(&mddev->open_mutex);
552 mutex_init(&mddev->reconfig_mutex);
553 mutex_init(&mddev->bitmap_info.mutex);
554 INIT_LIST_HEAD(&mddev->disks);
555 INIT_LIST_HEAD(&mddev->all_mddevs);
556 init_timer(&mddev->safemode_timer);
557 atomic_set(&mddev->active, 1);
558 atomic_set(&mddev->openers, 0);
559 atomic_set(&mddev->active_io, 0);
560 atomic_set(&mddev->plug_cnt, 0);
561 spin_lock_init(&mddev->write_lock);
562 atomic_set(&mddev->flush_pending, 0);
563 init_waitqueue_head(&mddev->sb_wait);
564 init_waitqueue_head(&mddev->recovery_wait);
565 mddev->reshape_position = MaxSector;
566 mddev->resync_min = 0;
567 mddev->resync_max = MaxSector;
568 mddev->level = LEVEL_NONE;
570 EXPORT_SYMBOL_GPL(mddev_init);
572 static mddev_t * mddev_find(dev_t unit)
574 mddev_t *mddev, *new = NULL;
576 if (unit && MAJOR(unit) != MD_MAJOR)
577 unit &= ~((1<<MdpMinorShift)-1);
580 spin_lock(&all_mddevs_lock);
583 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
584 if (mddev->unit == unit) {
586 spin_unlock(&all_mddevs_lock);
592 list_add(&new->all_mddevs, &all_mddevs);
593 spin_unlock(&all_mddevs_lock);
594 new->hold_active = UNTIL_IOCTL;
598 /* find an unused unit number */
599 static int next_minor = 512;
600 int start = next_minor;
604 dev = MKDEV(MD_MAJOR, next_minor);
606 if (next_minor > MINORMASK)
608 if (next_minor == start) {
609 /* Oh dear, all in use. */
610 spin_unlock(&all_mddevs_lock);
616 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
617 if (mddev->unit == dev) {
623 new->md_minor = MINOR(dev);
624 new->hold_active = UNTIL_STOP;
625 list_add(&new->all_mddevs, &all_mddevs);
626 spin_unlock(&all_mddevs_lock);
629 spin_unlock(&all_mddevs_lock);
631 new = kzalloc(sizeof(*new), GFP_KERNEL);
636 if (MAJOR(unit) == MD_MAJOR)
637 new->md_minor = MINOR(unit);
639 new->md_minor = MINOR(unit) >> MdpMinorShift;
646 static inline int mddev_lock(mddev_t * mddev)
648 return mutex_lock_interruptible(&mddev->reconfig_mutex);
651 static inline int mddev_is_locked(mddev_t *mddev)
653 return mutex_is_locked(&mddev->reconfig_mutex);
656 static inline int mddev_trylock(mddev_t * mddev)
658 return mutex_trylock(&mddev->reconfig_mutex);
661 static struct attribute_group md_redundancy_group;
663 static void mddev_unlock(mddev_t * mddev)
665 if (mddev->to_remove) {
666 /* These cannot be removed under reconfig_mutex as
667 * an access to the files will try to take reconfig_mutex
668 * while holding the file unremovable, which leads to
670 * So hold set sysfs_active while the remove in happeing,
671 * and anything else which might set ->to_remove or my
672 * otherwise change the sysfs namespace will fail with
673 * -EBUSY if sysfs_active is still set.
674 * We set sysfs_active under reconfig_mutex and elsewhere
675 * test it under the same mutex to ensure its correct value
678 struct attribute_group *to_remove = mddev->to_remove;
679 mddev->to_remove = NULL;
680 mddev->sysfs_active = 1;
681 mutex_unlock(&mddev->reconfig_mutex);
683 if (mddev->kobj.sd) {
684 if (to_remove != &md_redundancy_group)
685 sysfs_remove_group(&mddev->kobj, to_remove);
686 if (mddev->pers == NULL ||
687 mddev->pers->sync_request == NULL) {
688 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
689 if (mddev->sysfs_action)
690 sysfs_put(mddev->sysfs_action);
691 mddev->sysfs_action = NULL;
694 mddev->sysfs_active = 0;
696 mutex_unlock(&mddev->reconfig_mutex);
698 /* was we've dropped the mutex we need a spinlock to
699 * make sur the thread doesn't disappear
701 spin_lock(&pers_lock);
702 md_wakeup_thread(mddev->thread);
703 spin_unlock(&pers_lock);
706 static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr)
710 list_for_each_entry(rdev, &mddev->disks, same_set)
711 if (rdev->desc_nr == nr)
717 static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev)
721 list_for_each_entry(rdev, &mddev->disks, same_set)
722 if (rdev->bdev->bd_dev == dev)
728 static struct mdk_personality *find_pers(int level, char *clevel)
730 struct mdk_personality *pers;
731 list_for_each_entry(pers, &pers_list, list) {
732 if (level != LEVEL_NONE && pers->level == level)
734 if (strcmp(pers->name, clevel)==0)
740 /* return the offset of the super block in 512byte sectors */
741 static inline sector_t calc_dev_sboffset(mdk_rdev_t *rdev)
743 sector_t num_sectors = i_size_read(rdev->bdev->bd_inode) / 512;
744 return MD_NEW_SIZE_SECTORS(num_sectors);
747 static int alloc_disk_sb(mdk_rdev_t * rdev)
752 rdev->sb_page = alloc_page(GFP_KERNEL);
753 if (!rdev->sb_page) {
754 printk(KERN_ALERT "md: out of memory.\n");
761 static void free_disk_sb(mdk_rdev_t * rdev)
764 put_page(rdev->sb_page);
766 rdev->sb_page = NULL;
773 static void super_written(struct bio *bio, int error)
775 mdk_rdev_t *rdev = bio->bi_private;
776 mddev_t *mddev = rdev->mddev;
778 if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) {
779 printk("md: super_written gets error=%d, uptodate=%d\n",
780 error, test_bit(BIO_UPTODATE, &bio->bi_flags));
781 WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags));
782 md_error(mddev, rdev);
785 if (atomic_dec_and_test(&mddev->pending_writes))
786 wake_up(&mddev->sb_wait);
790 void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
791 sector_t sector, int size, struct page *page)
793 /* write first size bytes of page to sector of rdev
794 * Increment mddev->pending_writes before returning
795 * and decrement it on completion, waking up sb_wait
796 * if zero is reached.
797 * If an error occurred, call md_error
799 struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, mddev);
801 bio->bi_bdev = rdev->meta_bdev ? rdev->meta_bdev : rdev->bdev;
802 bio->bi_sector = sector;
803 bio_add_page(bio, page, size, 0);
804 bio->bi_private = rdev;
805 bio->bi_end_io = super_written;
807 atomic_inc(&mddev->pending_writes);
808 submit_bio(REQ_WRITE | REQ_SYNC | REQ_FLUSH | REQ_FUA, bio);
811 void md_super_wait(mddev_t *mddev)
813 /* wait for all superblock writes that were scheduled to complete */
816 prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE);
817 if (atomic_read(&mddev->pending_writes)==0)
821 finish_wait(&mddev->sb_wait, &wq);
824 static void bi_complete(struct bio *bio, int error)
826 complete((struct completion*)bio->bi_private);
829 int sync_page_io(mdk_rdev_t *rdev, sector_t sector, int size,
830 struct page *page, int rw, bool metadata_op)
832 struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, rdev->mddev);
833 struct completion event;
838 bio->bi_bdev = (metadata_op && rdev->meta_bdev) ?
839 rdev->meta_bdev : rdev->bdev;
841 bio->bi_sector = sector + rdev->sb_start;
843 bio->bi_sector = sector + rdev->data_offset;
844 bio_add_page(bio, page, size, 0);
845 init_completion(&event);
846 bio->bi_private = &event;
847 bio->bi_end_io = bi_complete;
849 wait_for_completion(&event);
851 ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
855 EXPORT_SYMBOL_GPL(sync_page_io);
857 static int read_disk_sb(mdk_rdev_t * rdev, int size)
859 char b[BDEVNAME_SIZE];
860 if (!rdev->sb_page) {
868 if (!sync_page_io(rdev, 0, size, rdev->sb_page, READ, true))
874 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
875 bdevname(rdev->bdev,b));
879 static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
881 return sb1->set_uuid0 == sb2->set_uuid0 &&
882 sb1->set_uuid1 == sb2->set_uuid1 &&
883 sb1->set_uuid2 == sb2->set_uuid2 &&
884 sb1->set_uuid3 == sb2->set_uuid3;
887 static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
890 mdp_super_t *tmp1, *tmp2;
892 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
893 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
895 if (!tmp1 || !tmp2) {
897 printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n");
905 * nr_disks is not constant
910 ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0);
918 static u32 md_csum_fold(u32 csum)
920 csum = (csum & 0xffff) + (csum >> 16);
921 return (csum & 0xffff) + (csum >> 16);
924 static unsigned int calc_sb_csum(mdp_super_t * sb)
927 u32 *sb32 = (u32*)sb;
929 unsigned int disk_csum, csum;
931 disk_csum = sb->sb_csum;
934 for (i = 0; i < MD_SB_BYTES/4 ; i++)
936 csum = (newcsum & 0xffffffff) + (newcsum>>32);
940 /* This used to use csum_partial, which was wrong for several
941 * reasons including that different results are returned on
942 * different architectures. It isn't critical that we get exactly
943 * the same return value as before (we always csum_fold before
944 * testing, and that removes any differences). However as we
945 * know that csum_partial always returned a 16bit value on
946 * alphas, do a fold to maximise conformity to previous behaviour.
948 sb->sb_csum = md_csum_fold(disk_csum);
950 sb->sb_csum = disk_csum;
957 * Handle superblock details.
958 * We want to be able to handle multiple superblock formats
959 * so we have a common interface to them all, and an array of
960 * different handlers.
961 * We rely on user-space to write the initial superblock, and support
962 * reading and updating of superblocks.
963 * Interface methods are:
964 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
965 * loads and validates a superblock on dev.
966 * if refdev != NULL, compare superblocks on both devices
968 * 0 - dev has a superblock that is compatible with refdev
969 * 1 - dev has a superblock that is compatible and newer than refdev
970 * so dev should be used as the refdev in future
971 * -EINVAL superblock incompatible or invalid
972 * -othererror e.g. -EIO
974 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
975 * Verify that dev is acceptable into mddev.
976 * The first time, mddev->raid_disks will be 0, and data from
977 * dev should be merged in. Subsequent calls check that dev
978 * is new enough. Return 0 or -EINVAL
980 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
981 * Update the superblock for rdev with data in mddev
982 * This does not write to disc.
988 struct module *owner;
989 int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev,
991 int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev);
992 void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev);
993 unsigned long long (*rdev_size_change)(mdk_rdev_t *rdev,
994 sector_t num_sectors);
998 * Check that the given mddev has no bitmap.
1000 * This function is called from the run method of all personalities that do not
1001 * support bitmaps. It prints an error message and returns non-zero if mddev
1002 * has a bitmap. Otherwise, it returns 0.
1005 int md_check_no_bitmap(mddev_t *mddev)
1007 if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset)
1009 printk(KERN_ERR "%s: bitmaps are not supported for %s\n",
1010 mdname(mddev), mddev->pers->name);
1013 EXPORT_SYMBOL(md_check_no_bitmap);
1016 * load_super for 0.90.0
1018 static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
1020 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1025 * Calculate the position of the superblock (512byte sectors),
1026 * it's at the end of the disk.
1028 * It also happens to be a multiple of 4Kb.
1030 rdev->sb_start = calc_dev_sboffset(rdev);
1032 ret = read_disk_sb(rdev, MD_SB_BYTES);
1033 if (ret) return ret;
1037 bdevname(rdev->bdev, b);
1038 sb = (mdp_super_t*)page_address(rdev->sb_page);
1040 if (sb->md_magic != MD_SB_MAGIC) {
1041 printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
1046 if (sb->major_version != 0 ||
1047 sb->minor_version < 90 ||
1048 sb->minor_version > 91) {
1049 printk(KERN_WARNING "Bad version number %d.%d on %s\n",
1050 sb->major_version, sb->minor_version,
1055 if (sb->raid_disks <= 0)
1058 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
1059 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
1064 rdev->preferred_minor = sb->md_minor;
1065 rdev->data_offset = 0;
1066 rdev->sb_size = MD_SB_BYTES;
1068 if (sb->level == LEVEL_MULTIPATH)
1071 rdev->desc_nr = sb->this_disk.number;
1077 mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page);
1078 if (!uuid_equal(refsb, sb)) {
1079 printk(KERN_WARNING "md: %s has different UUID to %s\n",
1080 b, bdevname(refdev->bdev,b2));
1083 if (!sb_equal(refsb, sb)) {
1084 printk(KERN_WARNING "md: %s has same UUID"
1085 " but different superblock to %s\n",
1086 b, bdevname(refdev->bdev, b2));
1090 ev2 = md_event(refsb);
1096 rdev->sectors = rdev->sb_start;
1097 /* Limit to 4TB as metadata cannot record more than that */
1098 if (rdev->sectors >= (2ULL << 32))
1099 rdev->sectors = (2ULL << 32) - 2;
1101 if (rdev->sectors < ((sector_t)sb->size) * 2 && sb->level >= 1)
1102 /* "this cannot possibly happen" ... */
1110 * validate_super for 0.90.0
1112 static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
1115 mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page);
1116 __u64 ev1 = md_event(sb);
1118 rdev->raid_disk = -1;
1119 clear_bit(Faulty, &rdev->flags);
1120 clear_bit(In_sync, &rdev->flags);
1121 clear_bit(WriteMostly, &rdev->flags);
1123 if (mddev->raid_disks == 0) {
1124 mddev->major_version = 0;
1125 mddev->minor_version = sb->minor_version;
1126 mddev->patch_version = sb->patch_version;
1127 mddev->external = 0;
1128 mddev->chunk_sectors = sb->chunk_size >> 9;
1129 mddev->ctime = sb->ctime;
1130 mddev->utime = sb->utime;
1131 mddev->level = sb->level;
1132 mddev->clevel[0] = 0;
1133 mddev->layout = sb->layout;
1134 mddev->raid_disks = sb->raid_disks;
1135 mddev->dev_sectors = ((sector_t)sb->size) * 2;
1136 mddev->events = ev1;
1137 mddev->bitmap_info.offset = 0;
1138 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
1140 if (mddev->minor_version >= 91) {
1141 mddev->reshape_position = sb->reshape_position;
1142 mddev->delta_disks = sb->delta_disks;
1143 mddev->new_level = sb->new_level;
1144 mddev->new_layout = sb->new_layout;
1145 mddev->new_chunk_sectors = sb->new_chunk >> 9;
1147 mddev->reshape_position = MaxSector;
1148 mddev->delta_disks = 0;
1149 mddev->new_level = mddev->level;
1150 mddev->new_layout = mddev->layout;
1151 mddev->new_chunk_sectors = mddev->chunk_sectors;
1154 if (sb->state & (1<<MD_SB_CLEAN))
1155 mddev->recovery_cp = MaxSector;
1157 if (sb->events_hi == sb->cp_events_hi &&
1158 sb->events_lo == sb->cp_events_lo) {
1159 mddev->recovery_cp = sb->recovery_cp;
1161 mddev->recovery_cp = 0;
1164 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
1165 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
1166 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
1167 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
1169 mddev->max_disks = MD_SB_DISKS;
1171 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
1172 mddev->bitmap_info.file == NULL)
1173 mddev->bitmap_info.offset =
1174 mddev->bitmap_info.default_offset;
1176 } else if (mddev->pers == NULL) {
1177 /* Insist on good event counter while assembling, except
1178 * for spares (which don't need an event count) */
1180 if (sb->disks[rdev->desc_nr].state & (
1181 (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE)))
1182 if (ev1 < mddev->events)
1184 } else if (mddev->bitmap) {
1185 /* if adding to array with a bitmap, then we can accept an
1186 * older device ... but not too old.
1188 if (ev1 < mddev->bitmap->events_cleared)
1191 if (ev1 < mddev->events)
1192 /* just a hot-add of a new device, leave raid_disk at -1 */
1196 if (mddev->level != LEVEL_MULTIPATH) {
1197 desc = sb->disks + rdev->desc_nr;
1199 if (desc->state & (1<<MD_DISK_FAULTY))
1200 set_bit(Faulty, &rdev->flags);
1201 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
1202 desc->raid_disk < mddev->raid_disks */) {
1203 set_bit(In_sync, &rdev->flags);
1204 rdev->raid_disk = desc->raid_disk;
1205 } else if (desc->state & (1<<MD_DISK_ACTIVE)) {
1206 /* active but not in sync implies recovery up to
1207 * reshape position. We don't know exactly where
1208 * that is, so set to zero for now */
1209 if (mddev->minor_version >= 91) {
1210 rdev->recovery_offset = 0;
1211 rdev->raid_disk = desc->raid_disk;
1214 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
1215 set_bit(WriteMostly, &rdev->flags);
1216 } else /* MULTIPATH are always insync */
1217 set_bit(In_sync, &rdev->flags);
1222 * sync_super for 0.90.0
1224 static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1228 int next_spare = mddev->raid_disks;
1231 /* make rdev->sb match mddev data..
1234 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1235 * 3/ any empty disks < next_spare become removed
1237 * disks[0] gets initialised to REMOVED because
1238 * we cannot be sure from other fields if it has
1239 * been initialised or not.
1242 int active=0, working=0,failed=0,spare=0,nr_disks=0;
1244 rdev->sb_size = MD_SB_BYTES;
1246 sb = (mdp_super_t*)page_address(rdev->sb_page);
1248 memset(sb, 0, sizeof(*sb));
1250 sb->md_magic = MD_SB_MAGIC;
1251 sb->major_version = mddev->major_version;
1252 sb->patch_version = mddev->patch_version;
1253 sb->gvalid_words = 0; /* ignored */
1254 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
1255 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
1256 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
1257 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
1259 sb->ctime = mddev->ctime;
1260 sb->level = mddev->level;
1261 sb->size = mddev->dev_sectors / 2;
1262 sb->raid_disks = mddev->raid_disks;
1263 sb->md_minor = mddev->md_minor;
1264 sb->not_persistent = 0;
1265 sb->utime = mddev->utime;
1267 sb->events_hi = (mddev->events>>32);
1268 sb->events_lo = (u32)mddev->events;
1270 if (mddev->reshape_position == MaxSector)
1271 sb->minor_version = 90;
1273 sb->minor_version = 91;
1274 sb->reshape_position = mddev->reshape_position;
1275 sb->new_level = mddev->new_level;
1276 sb->delta_disks = mddev->delta_disks;
1277 sb->new_layout = mddev->new_layout;
1278 sb->new_chunk = mddev->new_chunk_sectors << 9;
1280 mddev->minor_version = sb->minor_version;
1283 sb->recovery_cp = mddev->recovery_cp;
1284 sb->cp_events_hi = (mddev->events>>32);
1285 sb->cp_events_lo = (u32)mddev->events;
1286 if (mddev->recovery_cp == MaxSector)
1287 sb->state = (1<< MD_SB_CLEAN);
1289 sb->recovery_cp = 0;
1291 sb->layout = mddev->layout;
1292 sb->chunk_size = mddev->chunk_sectors << 9;
1294 if (mddev->bitmap && mddev->bitmap_info.file == NULL)
1295 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
1297 sb->disks[0].state = (1<<MD_DISK_REMOVED);
1298 list_for_each_entry(rdev2, &mddev->disks, same_set) {
1301 int is_active = test_bit(In_sync, &rdev2->flags);
1303 if (rdev2->raid_disk >= 0 &&
1304 sb->minor_version >= 91)
1305 /* we have nowhere to store the recovery_offset,
1306 * but if it is not below the reshape_position,
1307 * we can piggy-back on that.
1310 if (rdev2->raid_disk < 0 ||
1311 test_bit(Faulty, &rdev2->flags))
1314 desc_nr = rdev2->raid_disk;
1316 desc_nr = next_spare++;
1317 rdev2->desc_nr = desc_nr;
1318 d = &sb->disks[rdev2->desc_nr];
1320 d->number = rdev2->desc_nr;
1321 d->major = MAJOR(rdev2->bdev->bd_dev);
1322 d->minor = MINOR(rdev2->bdev->bd_dev);
1324 d->raid_disk = rdev2->raid_disk;
1326 d->raid_disk = rdev2->desc_nr; /* compatibility */
1327 if (test_bit(Faulty, &rdev2->flags))
1328 d->state = (1<<MD_DISK_FAULTY);
1329 else if (is_active) {
1330 d->state = (1<<MD_DISK_ACTIVE);
1331 if (test_bit(In_sync, &rdev2->flags))
1332 d->state |= (1<<MD_DISK_SYNC);
1340 if (test_bit(WriteMostly, &rdev2->flags))
1341 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1343 /* now set the "removed" and "faulty" bits on any missing devices */
1344 for (i=0 ; i < mddev->raid_disks ; i++) {
1345 mdp_disk_t *d = &sb->disks[i];
1346 if (d->state == 0 && d->number == 0) {
1349 d->state = (1<<MD_DISK_REMOVED);
1350 d->state |= (1<<MD_DISK_FAULTY);
1354 sb->nr_disks = nr_disks;
1355 sb->active_disks = active;
1356 sb->working_disks = working;
1357 sb->failed_disks = failed;
1358 sb->spare_disks = spare;
1360 sb->this_disk = sb->disks[rdev->desc_nr];
1361 sb->sb_csum = calc_sb_csum(sb);
1365 * rdev_size_change for 0.90.0
1367 static unsigned long long
1368 super_90_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors)
1370 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1371 return 0; /* component must fit device */
1372 if (rdev->mddev->bitmap_info.offset)
1373 return 0; /* can't move bitmap */
1374 rdev->sb_start = calc_dev_sboffset(rdev);
1375 if (!num_sectors || num_sectors > rdev->sb_start)
1376 num_sectors = rdev->sb_start;
1377 /* Limit to 4TB as metadata cannot record more than that.
1378 * 4TB == 2^32 KB, or 2*2^32 sectors.
1380 if (num_sectors >= (2ULL << 32))
1381 num_sectors = (2ULL << 32) - 2;
1382 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1384 md_super_wait(rdev->mddev);
1390 * version 1 superblock
1393 static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb)
1397 unsigned long long newcsum;
1398 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1399 __le32 *isuper = (__le32*)sb;
1402 disk_csum = sb->sb_csum;
1405 for (i=0; size>=4; size -= 4 )
1406 newcsum += le32_to_cpu(*isuper++);
1409 newcsum += le16_to_cpu(*(__le16*) isuper);
1411 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1412 sb->sb_csum = disk_csum;
1413 return cpu_to_le32(csum);
1416 static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
1418 struct mdp_superblock_1 *sb;
1421 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1425 * Calculate the position of the superblock in 512byte sectors.
1426 * It is always aligned to a 4K boundary and
1427 * depeding on minor_version, it can be:
1428 * 0: At least 8K, but less than 12K, from end of device
1429 * 1: At start of device
1430 * 2: 4K from start of device.
1432 switch(minor_version) {
1434 sb_start = i_size_read(rdev->bdev->bd_inode) >> 9;
1436 sb_start &= ~(sector_t)(4*2-1);
1447 rdev->sb_start = sb_start;
1449 /* superblock is rarely larger than 1K, but it can be larger,
1450 * and it is safe to read 4k, so we do that
1452 ret = read_disk_sb(rdev, 4096);
1453 if (ret) return ret;
1456 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1458 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1459 sb->major_version != cpu_to_le32(1) ||
1460 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1461 le64_to_cpu(sb->super_offset) != rdev->sb_start ||
1462 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1465 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1466 printk("md: invalid superblock checksum on %s\n",
1467 bdevname(rdev->bdev,b));
1470 if (le64_to_cpu(sb->data_size) < 10) {
1471 printk("md: data_size too small on %s\n",
1472 bdevname(rdev->bdev,b));
1476 rdev->preferred_minor = 0xffff;
1477 rdev->data_offset = le64_to_cpu(sb->data_offset);
1478 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1480 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1481 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1482 if (rdev->sb_size & bmask)
1483 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1486 && rdev->data_offset < sb_start + (rdev->sb_size/512))
1489 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1492 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1498 struct mdp_superblock_1 *refsb =
1499 (struct mdp_superblock_1*)page_address(refdev->sb_page);
1501 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1502 sb->level != refsb->level ||
1503 sb->layout != refsb->layout ||
1504 sb->chunksize != refsb->chunksize) {
1505 printk(KERN_WARNING "md: %s has strangely different"
1506 " superblock to %s\n",
1507 bdevname(rdev->bdev,b),
1508 bdevname(refdev->bdev,b2));
1511 ev1 = le64_to_cpu(sb->events);
1512 ev2 = le64_to_cpu(refsb->events);
1520 rdev->sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) -
1521 le64_to_cpu(sb->data_offset);
1523 rdev->sectors = rdev->sb_start;
1524 if (rdev->sectors < le64_to_cpu(sb->data_size))
1526 rdev->sectors = le64_to_cpu(sb->data_size);
1527 if (le64_to_cpu(sb->size) > rdev->sectors)
1532 static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
1534 struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1535 __u64 ev1 = le64_to_cpu(sb->events);
1537 rdev->raid_disk = -1;
1538 clear_bit(Faulty, &rdev->flags);
1539 clear_bit(In_sync, &rdev->flags);
1540 clear_bit(WriteMostly, &rdev->flags);
1542 if (mddev->raid_disks == 0) {
1543 mddev->major_version = 1;
1544 mddev->patch_version = 0;
1545 mddev->external = 0;
1546 mddev->chunk_sectors = le32_to_cpu(sb->chunksize);
1547 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1548 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1549 mddev->level = le32_to_cpu(sb->level);
1550 mddev->clevel[0] = 0;
1551 mddev->layout = le32_to_cpu(sb->layout);
1552 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1553 mddev->dev_sectors = le64_to_cpu(sb->size);
1554 mddev->events = ev1;
1555 mddev->bitmap_info.offset = 0;
1556 mddev->bitmap_info.default_offset = 1024 >> 9;
1558 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1559 memcpy(mddev->uuid, sb->set_uuid, 16);
1561 mddev->max_disks = (4096-256)/2;
1563 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1564 mddev->bitmap_info.file == NULL )
1565 mddev->bitmap_info.offset =
1566 (__s32)le32_to_cpu(sb->bitmap_offset);
1568 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1569 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1570 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1571 mddev->new_level = le32_to_cpu(sb->new_level);
1572 mddev->new_layout = le32_to_cpu(sb->new_layout);
1573 mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk);
1575 mddev->reshape_position = MaxSector;
1576 mddev->delta_disks = 0;
1577 mddev->new_level = mddev->level;
1578 mddev->new_layout = mddev->layout;
1579 mddev->new_chunk_sectors = mddev->chunk_sectors;
1582 } else if (mddev->pers == NULL) {
1583 /* Insist of good event counter while assembling, except for
1584 * spares (which don't need an event count) */
1586 if (rdev->desc_nr >= 0 &&
1587 rdev->desc_nr < le32_to_cpu(sb->max_dev) &&
1588 le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < 0xfffe)
1589 if (ev1 < mddev->events)
1591 } else if (mddev->bitmap) {
1592 /* If adding to array with a bitmap, then we can accept an
1593 * older device, but not too old.
1595 if (ev1 < mddev->bitmap->events_cleared)
1598 if (ev1 < mddev->events)
1599 /* just a hot-add of a new device, leave raid_disk at -1 */
1602 if (mddev->level != LEVEL_MULTIPATH) {
1604 if (rdev->desc_nr < 0 ||
1605 rdev->desc_nr >= le32_to_cpu(sb->max_dev)) {
1609 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1611 case 0xffff: /* spare */
1613 case 0xfffe: /* faulty */
1614 set_bit(Faulty, &rdev->flags);
1617 if ((le32_to_cpu(sb->feature_map) &
1618 MD_FEATURE_RECOVERY_OFFSET))
1619 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1621 set_bit(In_sync, &rdev->flags);
1622 rdev->raid_disk = role;
1625 if (sb->devflags & WriteMostly1)
1626 set_bit(WriteMostly, &rdev->flags);
1627 } else /* MULTIPATH are always insync */
1628 set_bit(In_sync, &rdev->flags);
1633 static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1635 struct mdp_superblock_1 *sb;
1638 /* make rdev->sb match mddev and rdev data. */
1640 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1642 sb->feature_map = 0;
1644 sb->recovery_offset = cpu_to_le64(0);
1645 memset(sb->pad1, 0, sizeof(sb->pad1));
1646 memset(sb->pad2, 0, sizeof(sb->pad2));
1647 memset(sb->pad3, 0, sizeof(sb->pad3));
1649 sb->utime = cpu_to_le64((__u64)mddev->utime);
1650 sb->events = cpu_to_le64(mddev->events);
1652 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1654 sb->resync_offset = cpu_to_le64(0);
1656 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
1658 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
1659 sb->size = cpu_to_le64(mddev->dev_sectors);
1660 sb->chunksize = cpu_to_le32(mddev->chunk_sectors);
1661 sb->level = cpu_to_le32(mddev->level);
1662 sb->layout = cpu_to_le32(mddev->layout);
1664 if (mddev->bitmap && mddev->bitmap_info.file == NULL) {
1665 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset);
1666 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
1669 if (rdev->raid_disk >= 0 &&
1670 !test_bit(In_sync, &rdev->flags)) {
1672 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1673 sb->recovery_offset =
1674 cpu_to_le64(rdev->recovery_offset);
1677 if (mddev->reshape_position != MaxSector) {
1678 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1679 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1680 sb->new_layout = cpu_to_le32(mddev->new_layout);
1681 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1682 sb->new_level = cpu_to_le32(mddev->new_level);
1683 sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors);
1687 list_for_each_entry(rdev2, &mddev->disks, same_set)
1688 if (rdev2->desc_nr+1 > max_dev)
1689 max_dev = rdev2->desc_nr+1;
1691 if (max_dev > le32_to_cpu(sb->max_dev)) {
1693 sb->max_dev = cpu_to_le32(max_dev);
1694 rdev->sb_size = max_dev * 2 + 256;
1695 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1696 if (rdev->sb_size & bmask)
1697 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1699 max_dev = le32_to_cpu(sb->max_dev);
1701 for (i=0; i<max_dev;i++)
1702 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1704 list_for_each_entry(rdev2, &mddev->disks, same_set) {
1706 if (test_bit(Faulty, &rdev2->flags))
1707 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1708 else if (test_bit(In_sync, &rdev2->flags))
1709 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1710 else if (rdev2->raid_disk >= 0)
1711 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1713 sb->dev_roles[i] = cpu_to_le16(0xffff);
1716 sb->sb_csum = calc_sb_1_csum(sb);
1719 static unsigned long long
1720 super_1_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors)
1722 struct mdp_superblock_1 *sb;
1723 sector_t max_sectors;
1724 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1725 return 0; /* component must fit device */
1726 if (rdev->sb_start < rdev->data_offset) {
1727 /* minor versions 1 and 2; superblock before data */
1728 max_sectors = i_size_read(rdev->bdev->bd_inode) >> 9;
1729 max_sectors -= rdev->data_offset;
1730 if (!num_sectors || num_sectors > max_sectors)
1731 num_sectors = max_sectors;
1732 } else if (rdev->mddev->bitmap_info.offset) {
1733 /* minor version 0 with bitmap we can't move */
1736 /* minor version 0; superblock after data */
1738 sb_start = (i_size_read(rdev->bdev->bd_inode) >> 9) - 8*2;
1739 sb_start &= ~(sector_t)(4*2 - 1);
1740 max_sectors = rdev->sectors + sb_start - rdev->sb_start;
1741 if (!num_sectors || num_sectors > max_sectors)
1742 num_sectors = max_sectors;
1743 rdev->sb_start = sb_start;
1745 sb = (struct mdp_superblock_1 *) page_address(rdev->sb_page);
1746 sb->data_size = cpu_to_le64(num_sectors);
1747 sb->super_offset = rdev->sb_start;
1748 sb->sb_csum = calc_sb_1_csum(sb);
1749 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1751 md_super_wait(rdev->mddev);
1755 static struct super_type super_types[] = {
1758 .owner = THIS_MODULE,
1759 .load_super = super_90_load,
1760 .validate_super = super_90_validate,
1761 .sync_super = super_90_sync,
1762 .rdev_size_change = super_90_rdev_size_change,
1766 .owner = THIS_MODULE,
1767 .load_super = super_1_load,
1768 .validate_super = super_1_validate,
1769 .sync_super = super_1_sync,
1770 .rdev_size_change = super_1_rdev_size_change,
1774 static void sync_super(mddev_t *mddev, mdk_rdev_t *rdev)
1776 if (mddev->sync_super) {
1777 mddev->sync_super(mddev, rdev);
1781 BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types));
1783 super_types[mddev->major_version].sync_super(mddev, rdev);
1786 static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)
1788 mdk_rdev_t *rdev, *rdev2;
1791 rdev_for_each_rcu(rdev, mddev1)
1792 rdev_for_each_rcu(rdev2, mddev2)
1793 if (rdev->bdev->bd_contains ==
1794 rdev2->bdev->bd_contains) {
1802 static LIST_HEAD(pending_raid_disks);
1805 * Try to register data integrity profile for an mddev
1807 * This is called when an array is started and after a disk has been kicked
1808 * from the array. It only succeeds if all working and active component devices
1809 * are integrity capable with matching profiles.
1811 int md_integrity_register(mddev_t *mddev)
1813 mdk_rdev_t *rdev, *reference = NULL;
1815 if (list_empty(&mddev->disks))
1816 return 0; /* nothing to do */
1817 if (!mddev->gendisk || blk_get_integrity(mddev->gendisk))
1818 return 0; /* shouldn't register, or already is */
1819 list_for_each_entry(rdev, &mddev->disks, same_set) {
1820 /* skip spares and non-functional disks */
1821 if (test_bit(Faulty, &rdev->flags))
1823 if (rdev->raid_disk < 0)
1826 /* Use the first rdev as the reference */
1830 /* does this rdev's profile match the reference profile? */
1831 if (blk_integrity_compare(reference->bdev->bd_disk,
1832 rdev->bdev->bd_disk) < 0)
1835 if (!reference || !bdev_get_integrity(reference->bdev))
1838 * All component devices are integrity capable and have matching
1839 * profiles, register the common profile for the md device.
1841 if (blk_integrity_register(mddev->gendisk,
1842 bdev_get_integrity(reference->bdev)) != 0) {
1843 printk(KERN_ERR "md: failed to register integrity for %s\n",
1847 printk(KERN_NOTICE "md: data integrity enabled on %s\n", mdname(mddev));
1848 if (bioset_integrity_create(mddev->bio_set, BIO_POOL_SIZE)) {
1849 printk(KERN_ERR "md: failed to create integrity pool for %s\n",
1855 EXPORT_SYMBOL(md_integrity_register);
1857 /* Disable data integrity if non-capable/non-matching disk is being added */
1858 void md_integrity_add_rdev(mdk_rdev_t *rdev, mddev_t *mddev)
1860 struct blk_integrity *bi_rdev = bdev_get_integrity(rdev->bdev);
1861 struct blk_integrity *bi_mddev = blk_get_integrity(mddev->gendisk);
1863 if (!bi_mddev) /* nothing to do */
1865 if (rdev->raid_disk < 0) /* skip spares */
1867 if (bi_rdev && blk_integrity_compare(mddev->gendisk,
1868 rdev->bdev->bd_disk) >= 0)
1870 printk(KERN_NOTICE "disabling data integrity on %s\n", mdname(mddev));
1871 blk_integrity_unregister(mddev->gendisk);
1873 EXPORT_SYMBOL(md_integrity_add_rdev);
1875 static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
1877 char b[BDEVNAME_SIZE];
1887 /* prevent duplicates */
1888 if (find_rdev(mddev, rdev->bdev->bd_dev))
1891 /* make sure rdev->sectors exceeds mddev->dev_sectors */
1892 if (rdev->sectors && (mddev->dev_sectors == 0 ||
1893 rdev->sectors < mddev->dev_sectors)) {
1895 /* Cannot change size, so fail
1896 * If mddev->level <= 0, then we don't care
1897 * about aligning sizes (e.g. linear)
1899 if (mddev->level > 0)
1902 mddev->dev_sectors = rdev->sectors;
1905 /* Verify rdev->desc_nr is unique.
1906 * If it is -1, assign a free number, else
1907 * check number is not in use
1909 if (rdev->desc_nr < 0) {
1911 if (mddev->pers) choice = mddev->raid_disks;
1912 while (find_rdev_nr(mddev, choice))
1914 rdev->desc_nr = choice;
1916 if (find_rdev_nr(mddev, rdev->desc_nr))
1919 if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) {
1920 printk(KERN_WARNING "md: %s: array is limited to %d devices\n",
1921 mdname(mddev), mddev->max_disks);
1924 bdevname(rdev->bdev,b);
1925 while ( (s=strchr(b, '/')) != NULL)
1928 rdev->mddev = mddev;
1929 printk(KERN_INFO "md: bind<%s>\n", b);
1931 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
1934 ko = &part_to_dev(rdev->bdev->bd_part)->kobj;
1935 if (sysfs_create_link(&rdev->kobj, ko, "block"))
1936 /* failure here is OK */;
1937 rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state");
1939 list_add_rcu(&rdev->same_set, &mddev->disks);
1940 bd_link_disk_holder(rdev->bdev, mddev->gendisk);
1942 /* May as well allow recovery to be retried once */
1943 mddev->recovery_disabled = 0;
1948 printk(KERN_WARNING "md: failed to register dev-%s for %s\n",
1953 static void md_delayed_delete(struct work_struct *ws)
1955 mdk_rdev_t *rdev = container_of(ws, mdk_rdev_t, del_work);
1956 kobject_del(&rdev->kobj);
1957 kobject_put(&rdev->kobj);
1960 static void unbind_rdev_from_array(mdk_rdev_t * rdev)
1962 char b[BDEVNAME_SIZE];
1967 bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk);
1968 list_del_rcu(&rdev->same_set);
1969 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
1971 sysfs_remove_link(&rdev->kobj, "block");
1972 sysfs_put(rdev->sysfs_state);
1973 rdev->sysfs_state = NULL;
1974 /* We need to delay this, otherwise we can deadlock when
1975 * writing to 'remove' to "dev/state". We also need
1976 * to delay it due to rcu usage.
1979 INIT_WORK(&rdev->del_work, md_delayed_delete);
1980 kobject_get(&rdev->kobj);
1981 queue_work(md_misc_wq, &rdev->del_work);
1985 * prevent the device from being mounted, repartitioned or
1986 * otherwise reused by a RAID array (or any other kernel
1987 * subsystem), by bd_claiming the device.
1989 static int lock_rdev(mdk_rdev_t *rdev, dev_t dev, int shared)
1992 struct block_device *bdev;
1993 char b[BDEVNAME_SIZE];
1995 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
1996 shared ? (mdk_rdev_t *)lock_rdev : rdev);
1998 printk(KERN_ERR "md: could not open %s.\n",
1999 __bdevname(dev, b));
2000 return PTR_ERR(bdev);
2006 static void unlock_rdev(mdk_rdev_t *rdev)
2008 struct block_device *bdev = rdev->bdev;
2012 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
2015 void md_autodetect_dev(dev_t dev);
2017 static void export_rdev(mdk_rdev_t * rdev)
2019 char b[BDEVNAME_SIZE];
2020 printk(KERN_INFO "md: export_rdev(%s)\n",
2021 bdevname(rdev->bdev,b));
2026 if (test_bit(AutoDetected, &rdev->flags))
2027 md_autodetect_dev(rdev->bdev->bd_dev);
2030 kobject_put(&rdev->kobj);
2033 static void kick_rdev_from_array(mdk_rdev_t * rdev)
2035 unbind_rdev_from_array(rdev);
2039 static void export_array(mddev_t *mddev)
2041 mdk_rdev_t *rdev, *tmp;
2043 rdev_for_each(rdev, tmp, mddev) {
2048 kick_rdev_from_array(rdev);
2050 if (!list_empty(&mddev->disks))
2052 mddev->raid_disks = 0;
2053 mddev->major_version = 0;
2056 static void print_desc(mdp_disk_t *desc)
2058 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
2059 desc->major,desc->minor,desc->raid_disk,desc->state);
2062 static void print_sb_90(mdp_super_t *sb)
2067 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
2068 sb->major_version, sb->minor_version, sb->patch_version,
2069 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
2071 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
2072 sb->level, sb->size, sb->nr_disks, sb->raid_disks,
2073 sb->md_minor, sb->layout, sb->chunk_size);
2074 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
2075 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
2076 sb->utime, sb->state, sb->active_disks, sb->working_disks,
2077 sb->failed_disks, sb->spare_disks,
2078 sb->sb_csum, (unsigned long)sb->events_lo);
2081 for (i = 0; i < MD_SB_DISKS; i++) {
2084 desc = sb->disks + i;
2085 if (desc->number || desc->major || desc->minor ||
2086 desc->raid_disk || (desc->state && (desc->state != 4))) {
2087 printk(" D %2d: ", i);
2091 printk(KERN_INFO "md: THIS: ");
2092 print_desc(&sb->this_disk);
2095 static void print_sb_1(struct mdp_superblock_1 *sb)
2099 uuid = sb->set_uuid;
2101 "md: SB: (V:%u) (F:0x%08x) Array-ID:<%pU>\n"
2102 "md: Name: \"%s\" CT:%llu\n",
2103 le32_to_cpu(sb->major_version),
2104 le32_to_cpu(sb->feature_map),
2107 (unsigned long long)le64_to_cpu(sb->ctime)
2108 & MD_SUPERBLOCK_1_TIME_SEC_MASK);
2110 uuid = sb->device_uuid;
2112 "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu"
2114 "md: Dev:%08x UUID: %pU\n"
2115 "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n"
2116 "md: (MaxDev:%u) \n",
2117 le32_to_cpu(sb->level),
2118 (unsigned long long)le64_to_cpu(sb->size),
2119 le32_to_cpu(sb->raid_disks),
2120 le32_to_cpu(sb->layout),
2121 le32_to_cpu(sb->chunksize),
2122 (unsigned long long)le64_to_cpu(sb->data_offset),
2123 (unsigned long long)le64_to_cpu(sb->data_size),
2124 (unsigned long long)le64_to_cpu(sb->super_offset),
2125 (unsigned long long)le64_to_cpu(sb->recovery_offset),
2126 le32_to_cpu(sb->dev_number),
2129 (unsigned long long)le64_to_cpu(sb->utime) & MD_SUPERBLOCK_1_TIME_SEC_MASK,
2130 (unsigned long long)le64_to_cpu(sb->events),
2131 (unsigned long long)le64_to_cpu(sb->resync_offset),
2132 le32_to_cpu(sb->sb_csum),
2133 le32_to_cpu(sb->max_dev)
2137 static void print_rdev(mdk_rdev_t *rdev, int major_version)
2139 char b[BDEVNAME_SIZE];
2140 printk(KERN_INFO "md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n",
2141 bdevname(rdev->bdev, b), (unsigned long long)rdev->sectors,
2142 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
2144 if (rdev->sb_loaded) {
2145 printk(KERN_INFO "md: rdev superblock (MJ:%d):\n", major_version);
2146 switch (major_version) {
2148 print_sb_90((mdp_super_t*)page_address(rdev->sb_page));
2151 print_sb_1((struct mdp_superblock_1 *)page_address(rdev->sb_page));
2155 printk(KERN_INFO "md: no rdev superblock!\n");
2158 static void md_print_devices(void)
2160 struct list_head *tmp;
2163 char b[BDEVNAME_SIZE];
2166 printk("md: **********************************\n");
2167 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
2168 printk("md: **********************************\n");
2169 for_each_mddev(mddev, tmp) {
2172 bitmap_print_sb(mddev->bitmap);
2174 printk("%s: ", mdname(mddev));
2175 list_for_each_entry(rdev, &mddev->disks, same_set)
2176 printk("<%s>", bdevname(rdev->bdev,b));
2179 list_for_each_entry(rdev, &mddev->disks, same_set)
2180 print_rdev(rdev, mddev->major_version);
2182 printk("md: **********************************\n");
2187 static void sync_sbs(mddev_t * mddev, int nospares)
2189 /* Update each superblock (in-memory image), but
2190 * if we are allowed to, skip spares which already
2191 * have the right event counter, or have one earlier
2192 * (which would mean they aren't being marked as dirty
2193 * with the rest of the array)
2196 list_for_each_entry(rdev, &mddev->disks, same_set) {
2197 if (rdev->sb_events == mddev->events ||
2199 rdev->raid_disk < 0 &&
2200 rdev->sb_events+1 == mddev->events)) {
2201 /* Don't update this superblock */
2202 rdev->sb_loaded = 2;
2204 sync_super(mddev, rdev);
2205 rdev->sb_loaded = 1;
2210 static void md_update_sb(mddev_t * mddev, int force_change)
2217 /* First make sure individual recovery_offsets are correct */
2218 list_for_each_entry(rdev, &mddev->disks, same_set) {
2219 if (rdev->raid_disk >= 0 &&
2220 mddev->delta_disks >= 0 &&
2221 !test_bit(In_sync, &rdev->flags) &&
2222 mddev->curr_resync_completed > rdev->recovery_offset)
2223 rdev->recovery_offset = mddev->curr_resync_completed;
2226 if (!mddev->persistent) {
2227 clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
2228 clear_bit(MD_CHANGE_DEVS, &mddev->flags);
2229 if (!mddev->external)
2230 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2231 wake_up(&mddev->sb_wait);
2235 spin_lock_irq(&mddev->write_lock);
2237 mddev->utime = get_seconds();
2239 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
2241 if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags))
2242 /* just a clean<-> dirty transition, possibly leave spares alone,
2243 * though if events isn't the right even/odd, we will have to do
2249 if (mddev->degraded)
2250 /* If the array is degraded, then skipping spares is both
2251 * dangerous and fairly pointless.
2252 * Dangerous because a device that was removed from the array
2253 * might have a event_count that still looks up-to-date,
2254 * so it can be re-added without a resync.
2255 * Pointless because if there are any spares to skip,
2256 * then a recovery will happen and soon that array won't
2257 * be degraded any more and the spare can go back to sleep then.
2261 sync_req = mddev->in_sync;
2263 /* If this is just a dirty<->clean transition, and the array is clean
2264 * and 'events' is odd, we can roll back to the previous clean state */
2266 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
2267 && mddev->can_decrease_events
2268 && mddev->events != 1) {
2270 mddev->can_decrease_events = 0;
2272 /* otherwise we have to go forward and ... */
2274 mddev->can_decrease_events = nospares;
2277 if (!mddev->events) {
2279 * oops, this 64-bit counter should never wrap.
2280 * Either we are in around ~1 trillion A.C., assuming
2281 * 1 reboot per second, or we have a bug:
2286 sync_sbs(mddev, nospares);
2287 spin_unlock_irq(&mddev->write_lock);
2290 "md: updating %s RAID superblock on device (in sync %d)\n",
2291 mdname(mddev),mddev->in_sync);
2293 bitmap_update_sb(mddev->bitmap);
2294 list_for_each_entry(rdev, &mddev->disks, same_set) {
2295 char b[BDEVNAME_SIZE];
2296 dprintk(KERN_INFO "md: ");
2297 if (rdev->sb_loaded != 1)
2298 continue; /* no noise on spare devices */
2299 if (test_bit(Faulty, &rdev->flags))
2300 dprintk("(skipping faulty ");
2302 dprintk("%s ", bdevname(rdev->bdev,b));
2303 if (!test_bit(Faulty, &rdev->flags)) {
2304 md_super_write(mddev,rdev,
2305 rdev->sb_start, rdev->sb_size,
2307 dprintk(KERN_INFO "(write) %s's sb offset: %llu\n",
2308 bdevname(rdev->bdev,b),
2309 (unsigned long long)rdev->sb_start);
2310 rdev->sb_events = mddev->events;
2314 if (mddev->level == LEVEL_MULTIPATH)
2315 /* only need to write one superblock... */
2318 md_super_wait(mddev);
2319 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2321 spin_lock_irq(&mddev->write_lock);
2322 if (mddev->in_sync != sync_req ||
2323 test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
2324 /* have to write it out again */
2325 spin_unlock_irq(&mddev->write_lock);
2328 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2329 spin_unlock_irq(&mddev->write_lock);
2330 wake_up(&mddev->sb_wait);
2331 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
2332 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
2336 /* words written to sysfs files may, or may not, be \n terminated.
2337 * We want to accept with case. For this we use cmd_match.
2339 static int cmd_match(const char *cmd, const char *str)
2341 /* See if cmd, written into a sysfs file, matches
2342 * str. They must either be the same, or cmd can
2343 * have a trailing newline
2345 while (*cmd && *str && *cmd == *str) {
2356 struct rdev_sysfs_entry {
2357 struct attribute attr;
2358 ssize_t (*show)(mdk_rdev_t *, char *);
2359 ssize_t (*store)(mdk_rdev_t *, const char *, size_t);
2363 state_show(mdk_rdev_t *rdev, char *page)
2368 if (test_bit(Faulty, &rdev->flags)) {
2369 len+= sprintf(page+len, "%sfaulty",sep);
2372 if (test_bit(In_sync, &rdev->flags)) {
2373 len += sprintf(page+len, "%sin_sync",sep);
2376 if (test_bit(WriteMostly, &rdev->flags)) {
2377 len += sprintf(page+len, "%swrite_mostly",sep);
2380 if (test_bit(Blocked, &rdev->flags)) {
2381 len += sprintf(page+len, "%sblocked", sep);
2384 if (!test_bit(Faulty, &rdev->flags) &&
2385 !test_bit(In_sync, &rdev->flags)) {
2386 len += sprintf(page+len, "%sspare", sep);
2389 return len+sprintf(page+len, "\n");
2393 state_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2396 * faulty - simulates and error
2397 * remove - disconnects the device
2398 * writemostly - sets write_mostly
2399 * -writemostly - clears write_mostly
2400 * blocked - sets the Blocked flag
2401 * -blocked - clears the Blocked flag
2402 * insync - sets Insync providing device isn't active
2405 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
2406 md_error(rdev->mddev, rdev);
2408 } else if (cmd_match(buf, "remove")) {
2409 if (rdev->raid_disk >= 0)
2412 mddev_t *mddev = rdev->mddev;
2413 kick_rdev_from_array(rdev);
2415 md_update_sb(mddev, 1);
2416 md_new_event(mddev);
2419 } else if (cmd_match(buf, "writemostly")) {
2420 set_bit(WriteMostly, &rdev->flags);
2422 } else if (cmd_match(buf, "-writemostly")) {
2423 clear_bit(WriteMostly, &rdev->flags);
2425 } else if (cmd_match(buf, "blocked")) {
2426 set_bit(Blocked, &rdev->flags);
2428 } else if (cmd_match(buf, "-blocked")) {
2429 clear_bit(Blocked, &rdev->flags);
2430 wake_up(&rdev->blocked_wait);
2431 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2432 md_wakeup_thread(rdev->mddev->thread);
2435 } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) {
2436 set_bit(In_sync, &rdev->flags);
2440 sysfs_notify_dirent_safe(rdev->sysfs_state);
2441 return err ? err : len;
2443 static struct rdev_sysfs_entry rdev_state =
2444 __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store);
2447 errors_show(mdk_rdev_t *rdev, char *page)
2449 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
2453 errors_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2456 unsigned long n = simple_strtoul(buf, &e, 10);
2457 if (*buf && (*e == 0 || *e == '\n')) {
2458 atomic_set(&rdev->corrected_errors, n);
2463 static struct rdev_sysfs_entry rdev_errors =
2464 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
2467 slot_show(mdk_rdev_t *rdev, char *page)
2469 if (rdev->raid_disk < 0)
2470 return sprintf(page, "none\n");
2472 return sprintf(page, "%d\n", rdev->raid_disk);
2476 slot_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2481 int slot = simple_strtoul(buf, &e, 10);
2482 if (strncmp(buf, "none", 4)==0)
2484 else if (e==buf || (*e && *e!= '\n'))
2486 if (rdev->mddev->pers && slot == -1) {
2487 /* Setting 'slot' on an active array requires also
2488 * updating the 'rd%d' link, and communicating
2489 * with the personality with ->hot_*_disk.
2490 * For now we only support removing
2491 * failed/spare devices. This normally happens automatically,
2492 * but not when the metadata is externally managed.
2494 if (rdev->raid_disk == -1)
2496 /* personality does all needed checks */
2497 if (rdev->mddev->pers->hot_remove_disk == NULL)
2499 err = rdev->mddev->pers->
2500 hot_remove_disk(rdev->mddev, rdev->raid_disk);
2503 sprintf(nm, "rd%d", rdev->raid_disk);
2504 sysfs_remove_link(&rdev->mddev->kobj, nm);
2505 rdev->raid_disk = -1;
2506 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2507 md_wakeup_thread(rdev->mddev->thread);
2508 } else if (rdev->mddev->pers) {
2510 /* Activating a spare .. or possibly reactivating
2511 * if we ever get bitmaps working here.
2514 if (rdev->raid_disk != -1)
2517 if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery))
2520 if (rdev->mddev->pers->hot_add_disk == NULL)
2523 list_for_each_entry(rdev2, &rdev->mddev->disks, same_set)
2524 if (rdev2->raid_disk == slot)
2527 if (slot >= rdev->mddev->raid_disks &&
2528 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
2531 rdev->raid_disk = slot;
2532 if (test_bit(In_sync, &rdev->flags))
2533 rdev->saved_raid_disk = slot;
2535 rdev->saved_raid_disk = -1;
2536 err = rdev->mddev->pers->
2537 hot_add_disk(rdev->mddev, rdev);
2539 rdev->raid_disk = -1;
2542 sysfs_notify_dirent_safe(rdev->sysfs_state);
2543 sprintf(nm, "rd%d", rdev->raid_disk);
2544 if (sysfs_create_link(&rdev->mddev->kobj, &rdev->kobj, nm))
2545 /* failure here is OK */;
2546 /* don't wakeup anyone, leave that to userspace. */
2548 if (slot >= rdev->mddev->raid_disks &&
2549 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
2551 rdev->raid_disk = slot;
2552 /* assume it is working */
2553 clear_bit(Faulty, &rdev->flags);
2554 clear_bit(WriteMostly, &rdev->flags);
2555 set_bit(In_sync, &rdev->flags);
2556 sysfs_notify_dirent_safe(rdev->sysfs_state);
2562 static struct rdev_sysfs_entry rdev_slot =
2563 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
2566 offset_show(mdk_rdev_t *rdev, char *page)
2568 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
2572 offset_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2575 unsigned long long offset = simple_strtoull(buf, &e, 10);
2576 if (e==buf || (*e && *e != '\n'))
2578 if (rdev->mddev->pers && rdev->raid_disk >= 0)
2580 if (rdev->sectors && rdev->mddev->external)
2581 /* Must set offset before size, so overlap checks
2584 rdev->data_offset = offset;
2588 static struct rdev_sysfs_entry rdev_offset =
2589 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
2592 rdev_size_show(mdk_rdev_t *rdev, char *page)
2594 return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2);
2597 static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
2599 /* check if two start/length pairs overlap */
2607 static int strict_blocks_to_sectors(const char *buf, sector_t *sectors)
2609 unsigned long long blocks;
2612 if (strict_strtoull(buf, 10, &blocks) < 0)
2615 if (blocks & 1ULL << (8 * sizeof(blocks) - 1))
2616 return -EINVAL; /* sector conversion overflow */
2619 if (new != blocks * 2)
2620 return -EINVAL; /* unsigned long long to sector_t overflow */
2627 rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2629 mddev_t *my_mddev = rdev->mddev;
2630 sector_t oldsectors = rdev->sectors;
2633 if (strict_blocks_to_sectors(buf, §ors) < 0)
2635 if (my_mddev->pers && rdev->raid_disk >= 0) {
2636 if (my_mddev->persistent) {
2637 sectors = super_types[my_mddev->major_version].
2638 rdev_size_change(rdev, sectors);
2641 } else if (!sectors)
2642 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) -
2645 if (sectors < my_mddev->dev_sectors)
2646 return -EINVAL; /* component must fit device */
2648 rdev->sectors = sectors;
2649 if (sectors > oldsectors && my_mddev->external) {
2650 /* need to check that all other rdevs with the same ->bdev
2651 * do not overlap. We need to unlock the mddev to avoid
2652 * a deadlock. We have already changed rdev->sectors, and if
2653 * we have to change it back, we will have the lock again.
2657 struct list_head *tmp;
2659 mddev_unlock(my_mddev);
2660 for_each_mddev(mddev, tmp) {
2664 list_for_each_entry(rdev2, &mddev->disks, same_set)
2665 if (rdev->bdev == rdev2->bdev &&
2667 overlaps(rdev->data_offset, rdev->sectors,
2673 mddev_unlock(mddev);
2679 mddev_lock(my_mddev);
2681 /* Someone else could have slipped in a size
2682 * change here, but doing so is just silly.
2683 * We put oldsectors back because we *know* it is
2684 * safe, and trust userspace not to race with
2687 rdev->sectors = oldsectors;
2694 static struct rdev_sysfs_entry rdev_size =
2695 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
2698 static ssize_t recovery_start_show(mdk_rdev_t *rdev, char *page)
2700 unsigned long long recovery_start = rdev->recovery_offset;
2702 if (test_bit(In_sync, &rdev->flags) ||
2703 recovery_start == MaxSector)
2704 return sprintf(page, "none\n");
2706 return sprintf(page, "%llu\n", recovery_start);
2709 static ssize_t recovery_start_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2711 unsigned long long recovery_start;
2713 if (cmd_match(buf, "none"))
2714 recovery_start = MaxSector;
2715 else if (strict_strtoull(buf, 10, &recovery_start))
2718 if (rdev->mddev->pers &&
2719 rdev->raid_disk >= 0)
2722 rdev->recovery_offset = recovery_start;
2723 if (recovery_start == MaxSector)
2724 set_bit(In_sync, &rdev->flags);
2726 clear_bit(In_sync, &rdev->flags);
2730 static struct rdev_sysfs_entry rdev_recovery_start =
2731 __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store);
2733 static struct attribute *rdev_default_attrs[] = {
2739 &rdev_recovery_start.attr,
2743 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
2745 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2746 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
2747 mddev_t *mddev = rdev->mddev;
2753 rv = mddev ? mddev_lock(mddev) : -EBUSY;
2755 if (rdev->mddev == NULL)
2758 rv = entry->show(rdev, page);
2759 mddev_unlock(mddev);
2765 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
2766 const char *page, size_t length)
2768 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2769 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
2771 mddev_t *mddev = rdev->mddev;
2775 if (!capable(CAP_SYS_ADMIN))
2777 rv = mddev ? mddev_lock(mddev): -EBUSY;
2779 if (rdev->mddev == NULL)
2782 rv = entry->store(rdev, page, length);
2783 mddev_unlock(mddev);
2788 static void rdev_free(struct kobject *ko)
2790 mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj);
2793 static const struct sysfs_ops rdev_sysfs_ops = {
2794 .show = rdev_attr_show,
2795 .store = rdev_attr_store,
2797 static struct kobj_type rdev_ktype = {
2798 .release = rdev_free,
2799 .sysfs_ops = &rdev_sysfs_ops,
2800 .default_attrs = rdev_default_attrs,
2803 void md_rdev_init(mdk_rdev_t *rdev)
2806 rdev->saved_raid_disk = -1;
2807 rdev->raid_disk = -1;
2809 rdev->data_offset = 0;
2810 rdev->sb_events = 0;
2811 rdev->last_read_error.tv_sec = 0;
2812 rdev->last_read_error.tv_nsec = 0;
2813 atomic_set(&rdev->nr_pending, 0);
2814 atomic_set(&rdev->read_errors, 0);
2815 atomic_set(&rdev->corrected_errors, 0);
2817 INIT_LIST_HEAD(&rdev->same_set);
2818 init_waitqueue_head(&rdev->blocked_wait);
2820 EXPORT_SYMBOL_GPL(md_rdev_init);
2822 * Import a device. If 'super_format' >= 0, then sanity check the superblock
2824 * mark the device faulty if:
2826 * - the device is nonexistent (zero size)
2827 * - the device has no valid superblock
2829 * a faulty rdev _never_ has rdev->sb set.
2831 static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor)
2833 char b[BDEVNAME_SIZE];
2838 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
2840 printk(KERN_ERR "md: could not alloc mem for new device!\n");
2841 return ERR_PTR(-ENOMEM);
2845 if ((err = alloc_disk_sb(rdev)))
2848 err = lock_rdev(rdev, newdev, super_format == -2);
2852 kobject_init(&rdev->kobj, &rdev_ktype);
2854 size = i_size_read(rdev->bdev->bd_inode) >> BLOCK_SIZE_BITS;
2857 "md: %s has zero or unknown size, marking faulty!\n",
2858 bdevname(rdev->bdev,b));
2863 if (super_format >= 0) {
2864 err = super_types[super_format].
2865 load_super(rdev, NULL, super_minor);
2866 if (err == -EINVAL) {
2868 "md: %s does not have a valid v%d.%d "
2869 "superblock, not importing!\n",
2870 bdevname(rdev->bdev,b),
2871 super_format, super_minor);
2876 "md: could not read %s's sb, not importing!\n",
2877 bdevname(rdev->bdev,b));
2885 if (rdev->sb_page) {
2891 return ERR_PTR(err);
2895 * Check a full RAID array for plausibility
2899 static void analyze_sbs(mddev_t * mddev)
2902 mdk_rdev_t *rdev, *freshest, *tmp;
2903 char b[BDEVNAME_SIZE];
2906 rdev_for_each(rdev, tmp, mddev)
2907 switch (super_types[mddev->major_version].
2908 load_super(rdev, freshest, mddev->minor_version)) {
2916 "md: fatal superblock inconsistency in %s"
2917 " -- removing from array\n",
2918 bdevname(rdev->bdev,b));
2919 kick_rdev_from_array(rdev);
2923 super_types[mddev->major_version].
2924 validate_super(mddev, freshest);
2927 rdev_for_each(rdev, tmp, mddev) {
2928 if (mddev->max_disks &&
2929 (rdev->desc_nr >= mddev->max_disks ||
2930 i > mddev->max_disks)) {
2932 "md: %s: %s: only %d devices permitted\n",
2933 mdname(mddev), bdevname(rdev->bdev, b),
2935 kick_rdev_from_array(rdev);
2938 if (rdev != freshest)
2939 if (super_types[mddev->major_version].
2940 validate_super(mddev, rdev)) {
2941 printk(KERN_WARNING "md: kicking non-fresh %s"
2943 bdevname(rdev->bdev,b));
2944 kick_rdev_from_array(rdev);
2947 if (mddev->level == LEVEL_MULTIPATH) {
2948 rdev->desc_nr = i++;
2949 rdev->raid_disk = rdev->desc_nr;
2950 set_bit(In_sync, &rdev->flags);
2951 } else if (rdev->raid_disk >= (mddev->raid_disks - min(0, mddev->delta_disks))) {
2952 rdev->raid_disk = -1;
2953 clear_bit(In_sync, &rdev->flags);
2958 /* Read a fixed-point number.
2959 * Numbers in sysfs attributes should be in "standard" units where
2960 * possible, so time should be in seconds.
2961 * However we internally use a a much smaller unit such as
2962 * milliseconds or jiffies.
2963 * This function takes a decimal number with a possible fractional
2964 * component, and produces an integer which is the result of
2965 * multiplying that number by 10^'scale'.
2966 * all without any floating-point arithmetic.
2968 int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale)
2970 unsigned long result = 0;
2972 while (isdigit(*cp) || (*cp == '.' && decimals < 0)) {
2975 else if (decimals < scale) {
2978 result = result * 10 + value;
2990 while (decimals < scale) {
2999 static void md_safemode_timeout(unsigned long data);
3002 safe_delay_show(mddev_t *mddev, char *page)
3004 int msec = (mddev->safemode_delay*1000)/HZ;
3005 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
3008 safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len)
3012 if (strict_strtoul_scaled(cbuf, &msec, 3) < 0)
3015 mddev->safemode_delay = 0;
3017 unsigned long old_delay = mddev->safemode_delay;
3018 mddev->safemode_delay = (msec*HZ)/1000;
3019 if (mddev->safemode_delay == 0)
3020 mddev->safemode_delay = 1;
3021 if (mddev->safemode_delay < old_delay)
3022 md_safemode_timeout((unsigned long)mddev);
3026 static struct md_sysfs_entry md_safe_delay =
3027 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
3030 level_show(mddev_t *mddev, char *page)
3032 struct mdk_personality *p = mddev->pers;
3034 return sprintf(page, "%s\n", p->name);
3035 else if (mddev->clevel[0])
3036 return sprintf(page, "%s\n", mddev->clevel);
3037 else if (mddev->level != LEVEL_NONE)
3038 return sprintf(page, "%d\n", mddev->level);
3044 level_store(mddev_t *mddev, const char *buf, size_t len)
3048 struct mdk_personality *pers;
3053 if (mddev->pers == NULL) {
3056 if (len >= sizeof(mddev->clevel))
3058 strncpy(mddev->clevel, buf, len);
3059 if (mddev->clevel[len-1] == '\n')
3061 mddev->clevel[len] = 0;
3062 mddev->level = LEVEL_NONE;
3066 /* request to change the personality. Need to ensure:
3067 * - array is not engaged in resync/recovery/reshape
3068 * - old personality can be suspended
3069 * - new personality will access other array.
3072 if (mddev->sync_thread ||
3073 mddev->reshape_position != MaxSector ||
3074 mddev->sysfs_active)
3077 if (!mddev->pers->quiesce) {
3078 printk(KERN_WARNING "md: %s: %s does not support online personality change\n",
3079 mdname(mddev), mddev->pers->name);
3083 /* Now find the new personality */
3084 if (len == 0 || len >= sizeof(clevel))
3086 strncpy(clevel, buf, len);
3087 if (clevel[len-1] == '\n')
3090 if (strict_strtol(clevel, 10, &level))
3093 if (request_module("md-%s", clevel) != 0)
3094 request_module("md-level-%s", clevel);
3095 spin_lock(&pers_lock);
3096 pers = find_pers(level, clevel);
3097 if (!pers || !try_module_get(pers->owner)) {
3098 spin_unlock(&pers_lock);
3099 printk(KERN_WARNING "md: personality %s not loaded\n", clevel);
3102 spin_unlock(&pers_lock);
3104 if (pers == mddev->pers) {
3105 /* Nothing to do! */
3106 module_put(pers->owner);
3109 if (!pers->takeover) {
3110 module_put(pers->owner);
3111 printk(KERN_WARNING "md: %s: %s does not support personality takeover\n",
3112 mdname(mddev), clevel);
3116 list_for_each_entry(rdev, &mddev->disks, same_set)
3117 rdev->new_raid_disk = rdev->raid_disk;
3119 /* ->takeover must set new_* and/or delta_disks
3120 * if it succeeds, and may set them when it fails.
3122 priv = pers->takeover(mddev);
3124 mddev->new_level = mddev->level;
3125 mddev->new_layout = mddev->layout;
3126 mddev->new_chunk_sectors = mddev->chunk_sectors;
3127 mddev->raid_disks -= mddev->delta_disks;
3128 mddev->delta_disks = 0;
3129 module_put(pers->owner);
3130 printk(KERN_WARNING "md: %s: %s would not accept array\n",
3131 mdname(mddev), clevel);
3132 return PTR_ERR(priv);
3135 /* Looks like we have a winner */
3136 mddev_suspend(mddev);
3137 mddev->pers->stop(mddev);
3139 if (mddev->pers->sync_request == NULL &&
3140 pers->sync_request != NULL) {
3141 /* need to add the md_redundancy_group */
3142 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
3144 "md: cannot register extra attributes for %s\n",
3146 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, NULL, "sync_action");
3148 if (mddev->pers->sync_request != NULL &&
3149 pers->sync_request == NULL) {
3150 /* need to remove the md_redundancy_group */
3151 if (mddev->to_remove == NULL)
3152 mddev->to_remove = &md_redundancy_group;
3155 if (mddev->pers->sync_request == NULL &&
3157 /* We are converting from a no-redundancy array
3158 * to a redundancy array and metadata is managed
3159 * externally so we need to be sure that writes
3160 * won't block due to a need to transition
3162 * until external management is started.
3165 mddev->safemode_delay = 0;
3166 mddev->safemode = 0;
3169 list_for_each_entry(rdev, &mddev->disks, same_set) {
3171 if (rdev->raid_disk < 0)
3173 if (rdev->new_raid_disk >= mddev->raid_disks)
3174 rdev->new_raid_disk = -1;
3175 if (rdev->new_raid_disk == rdev->raid_disk)
3177 sprintf(nm, "rd%d", rdev->raid_disk);
3178 sysfs_remove_link(&mddev->kobj, nm);
3180 list_for_each_entry(rdev, &mddev->disks, same_set) {
3181 if (rdev->raid_disk < 0)
3183 if (rdev->new_raid_disk == rdev->raid_disk)
3185 rdev->raid_disk = rdev->new_raid_disk;
3186 if (rdev->raid_disk < 0)
3187 clear_bit(In_sync, &rdev->flags);
3190 sprintf(nm, "rd%d", rdev->raid_disk);
3191 if(sysfs_create_link(&mddev->kobj, &rdev->kobj, nm))
3192 printk("md: cannot register %s for %s after level change\n",
3197 module_put(mddev->pers->owner);
3199 mddev->private = priv;
3200 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
3201 mddev->level = mddev->new_level;
3202 mddev->layout = mddev->new_layout;
3203 mddev->chunk_sectors = mddev->new_chunk_sectors;
3204 mddev->delta_disks = 0;
3205 mddev->degraded = 0;
3206 if (mddev->pers->sync_request == NULL) {
3207 /* this is now an array without redundancy, so
3208 * it must always be in_sync
3211 del_timer_sync(&mddev->safemode_timer);
3214 mddev_resume(mddev);
3215 set_bit(MD_CHANGE_DEVS, &mddev->flags);
3216 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3217 md_wakeup_thread(mddev->thread);
3218 sysfs_notify(&mddev->kobj, NULL, "level");
3219 md_new_event(mddev);
3223 static struct md_sysfs_entry md_level =
3224 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
3228 layout_show(mddev_t *mddev, char *page)
3230 /* just a number, not meaningful for all levels */
3231 if (mddev->reshape_position != MaxSector &&
3232 mddev->layout != mddev->new_layout)
3233 return sprintf(page, "%d (%d)\n",
3234 mddev->new_layout, mddev->layout);
3235 return sprintf(page, "%d\n", mddev->layout);
3239 layout_store(mddev_t *mddev, const char *buf, size_t len)
3242 unsigned long n = simple_strtoul(buf, &e, 10);
3244 if (!*buf || (*e && *e != '\n'))
3249 if (mddev->pers->check_reshape == NULL)
3251 mddev->new_layout = n;
3252 err = mddev->pers->check_reshape(mddev);
3254 mddev->new_layout = mddev->layout;
3258 mddev->new_layout = n;
3259 if (mddev->reshape_position == MaxSector)
3264 static struct md_sysfs_entry md_layout =
3265 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
3269 raid_disks_show(mddev_t *mddev, char *page)
3271 if (mddev->raid_disks == 0)
3273 if (mddev->reshape_position != MaxSector &&
3274 mddev->delta_disks != 0)
3275 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
3276 mddev->raid_disks - mddev->delta_disks);
3277 return sprintf(page, "%d\n", mddev->raid_disks);
3280 static int update_raid_disks(mddev_t *mddev, int raid_disks);
3283 raid_disks_store(mddev_t *mddev, const char *buf, size_t len)
3287 unsigned long n = simple_strtoul(buf, &e, 10);
3289 if (!*buf || (*e && *e != '\n'))
3293 rv = update_raid_disks(mddev, n);
3294 else if (mddev->reshape_position != MaxSector) {
3295 int olddisks = mddev->raid_disks - mddev->delta_disks;
3296 mddev->delta_disks = n - olddisks;
3297 mddev->raid_disks = n;
3299 mddev->raid_disks = n;
3300 return rv ? rv : len;
3302 static struct md_sysfs_entry md_raid_disks =
3303 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
3306 chunk_size_show(mddev_t *mddev, char *page)
3308 if (mddev->reshape_position != MaxSector &&
3309 mddev->chunk_sectors != mddev->new_chunk_sectors)
3310 return sprintf(page, "%d (%d)\n",
3311 mddev->new_chunk_sectors << 9,
3312 mddev->chunk_sectors << 9);
3313 return sprintf(page, "%d\n", mddev->chunk_sectors << 9);
3317 chunk_size_store(mddev_t *mddev, const char *buf, size_t len)
3320 unsigned long n = simple_strtoul(buf, &e, 10);
3322 if (!*buf || (*e && *e != '\n'))
3327 if (mddev->pers->check_reshape == NULL)
3329 mddev->new_chunk_sectors = n >> 9;
3330 err = mddev->pers->check_reshape(mddev);
3332 mddev->new_chunk_sectors = mddev->chunk_sectors;
3336 mddev->new_chunk_sectors = n >> 9;
3337 if (mddev->reshape_position == MaxSector)
3338 mddev->chunk_sectors = n >> 9;
3342 static struct md_sysfs_entry md_chunk_size =
3343 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
3346 resync_start_show(mddev_t *mddev, char *page)
3348 if (mddev->recovery_cp == MaxSector)
3349 return sprintf(page, "none\n");
3350 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
3354 resync_start_store(mddev_t *mddev, const char *buf, size_t len)
3357 unsigned long long n = simple_strtoull(buf, &e, 10);
3359 if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
3361 if (cmd_match(buf, "none"))
3363 else if (!*buf || (*e && *e != '\n'))
3366 mddev->recovery_cp = n;
3369 static struct md_sysfs_entry md_resync_start =
3370 __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store);
3373 * The array state can be:
3376 * No devices, no size, no level
3377 * Equivalent to STOP_ARRAY ioctl
3379 * May have some settings, but array is not active
3380 * all IO results in error
3381 * When written, doesn't tear down array, but just stops it
3382 * suspended (not supported yet)
3383 * All IO requests will block. The array can be reconfigured.
3384 * Writing this, if accepted, will block until array is quiescent
3386 * no resync can happen. no superblocks get written.
3387 * write requests fail
3389 * like readonly, but behaves like 'clean' on a write request.
3391 * clean - no pending writes, but otherwise active.
3392 * When written to inactive array, starts without resync
3393 * If a write request arrives then
3394 * if metadata is known, mark 'dirty' and switch to 'active'.
3395 * if not known, block and switch to write-pending
3396 * If written to an active array that has pending writes, then fails.
3398 * fully active: IO and resync can be happening.
3399 * When written to inactive array, starts with resync
3402 * clean, but writes are blocked waiting for 'active' to be written.
3405 * like active, but no writes have been seen for a while (100msec).
3408 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
3409 write_pending, active_idle, bad_word};
3410 static char *array_states[] = {
3411 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3412 "write-pending", "active-idle", NULL };
3414 static int match_word(const char *word, char **list)
3417 for (n=0; list[n]; n++)
3418 if (cmd_match(word, list[n]))
3424 array_state_show(mddev_t *mddev, char *page)
3426 enum array_state st = inactive;
3439 else if (test_bit(MD_CHANGE_PENDING, &mddev->flags))
3441 else if (mddev->safemode)
3447 if (list_empty(&mddev->disks) &&
3448 mddev->raid_disks == 0 &&
3449 mddev->dev_sectors == 0)
3454 return sprintf(page, "%s\n", array_states[st]);
3457 static int do_md_stop(mddev_t * mddev, int ro, int is_open);
3458 static int md_set_readonly(mddev_t * mddev, int is_open);
3459 static int do_md_run(mddev_t * mddev);
3460 static int restart_array(mddev_t *mddev);
3463 array_state_store(mddev_t *mddev, const char *buf, size_t len)
3466 enum array_state st = match_word(buf, array_states);
3471 /* stopping an active array */
3472 if (atomic_read(&mddev->openers) > 0)
3474 err = do_md_stop(mddev, 0, 0);
3477 /* stopping an active array */
3479 if (atomic_read(&mddev->openers) > 0)
3481 err = do_md_stop(mddev, 2, 0);
3483 err = 0; /* already inactive */
3486 break; /* not supported yet */
3489 err = md_set_readonly(mddev, 0);
3492 set_disk_ro(mddev->gendisk, 1);
3493 err = do_md_run(mddev);
3499 err = md_set_readonly(mddev, 0);
3500 else if (mddev->ro == 1)
3501 err = restart_array(mddev);
3504 set_disk_ro(mddev->gendisk, 0);
3508 err = do_md_run(mddev);
3513 restart_array(mddev);
3514 spin_lock_irq(&mddev->write_lock);
3515 if (atomic_read(&mddev->writes_pending) == 0) {
3516 if (mddev->in_sync == 0) {
3518 if (mddev->safemode == 1)
3519 mddev->safemode = 0;
3520 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
3525 spin_unlock_irq(&mddev->write_lock);
3531 restart_array(mddev);
3532 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
3533 wake_up(&mddev->sb_wait);
3537 set_disk_ro(mddev->gendisk, 0);
3538 err = do_md_run(mddev);
3543 /* these cannot be set */
3549 sysfs_notify_dirent_safe(mddev->sysfs_state);
3553 static struct md_sysfs_entry md_array_state =
3554 __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
3557 max_corrected_read_errors_show(mddev_t *mddev, char *page) {
3558 return sprintf(page, "%d\n",
3559 atomic_read(&mddev->max_corr_read_errors));
3563 max_corrected_read_errors_store(mddev_t *mddev, const char *buf, size_t len)
3566 unsigned long n = simple_strtoul(buf, &e, 10);
3568 if (*buf && (*e == 0 || *e == '\n')) {
3569 atomic_set(&mddev->max_corr_read_errors, n);
3575 static struct md_sysfs_entry max_corr_read_errors =
3576 __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show,
3577 max_corrected_read_errors_store);
3580 null_show(mddev_t *mddev, char *page)
3586 new_dev_store(mddev_t *mddev, const char *buf, size_t len)
3588 /* buf must be %d:%d\n? giving major and minor numbers */
3589 /* The new device is added to the array.
3590 * If the array has a persistent superblock, we read the
3591 * superblock to initialise info and check validity.
3592 * Otherwise, only checking done is that in bind_rdev_to_array,
3593 * which mainly checks size.
3596 int major = simple_strtoul(buf, &e, 10);
3602 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
3604 minor = simple_strtoul(e+1, &e, 10);
3605 if (*e && *e != '\n')
3607 dev = MKDEV(major, minor);
3608 if (major != MAJOR(dev) ||
3609 minor != MINOR(dev))
3613 if (mddev->persistent) {
3614 rdev = md_import_device(dev, mddev->major_version,
3615 mddev->minor_version);
3616 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
3617 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
3618 mdk_rdev_t, same_set);
3619 err = super_types[mddev->major_version]
3620 .load_super(rdev, rdev0, mddev->minor_version);
3624 } else if (mddev->external)
3625 rdev = md_import_device(dev, -2, -1);
3627 rdev = md_import_device(dev, -1, -1);
3630 return PTR_ERR(rdev);
3631 err = bind_rdev_to_array(rdev, mddev);
3635 return err ? err : len;
3638 static struct md_sysfs_entry md_new_device =
3639 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
3642 bitmap_store(mddev_t *mddev, const char *buf, size_t len)
3645 unsigned long chunk, end_chunk;
3649 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
3651 chunk = end_chunk = simple_strtoul(buf, &end, 0);
3652 if (buf == end) break;
3653 if (*end == '-') { /* range */
3655 end_chunk = simple_strtoul(buf, &end, 0);
3656 if (buf == end) break;
3658 if (*end && !isspace(*end)) break;
3659 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
3660 buf = skip_spaces(end);
3662 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
3667 static struct md_sysfs_entry md_bitmap =
3668 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
3671 size_show(mddev_t *mddev, char *page)
3673 return sprintf(page, "%llu\n",
3674 (unsigned long long)mddev->dev_sectors / 2);
3677 static int update_size(mddev_t *mddev, sector_t num_sectors);
3680 size_store(mddev_t *mddev, const char *buf, size_t len)
3682 /* If array is inactive, we can reduce the component size, but
3683 * not increase it (except from 0).
3684 * If array is active, we can try an on-line resize
3687 int err = strict_blocks_to_sectors(buf, §ors);
3692 err = update_size(mddev, sectors);
3693 md_update_sb(mddev, 1);
3695 if (mddev->dev_sectors == 0 ||
3696 mddev->dev_sectors > sectors)
3697 mddev->dev_sectors = sectors;
3701 return err ? err : len;
3704 static struct md_sysfs_entry md_size =
3705 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
3710 * 'none' for arrays with no metadata (good luck...)
3711 * 'external' for arrays with externally managed metadata,
3712 * or N.M for internally known formats
3715 metadata_show(mddev_t *mddev, char *page)
3717 if (mddev->persistent)
3718 return sprintf(page, "%d.%d\n",
3719 mddev->major_version, mddev->minor_version);
3720 else if (mddev->external)
3721 return sprintf(page, "external:%s\n", mddev->metadata_type);
3723 return sprintf(page, "none\n");
3727 metadata_store(mddev_t *mddev, const char *buf, size_t len)
3731 /* Changing the details of 'external' metadata is
3732 * always permitted. Otherwise there must be
3733 * no devices attached to the array.
3735 if (mddev->external && strncmp(buf, "external:", 9) == 0)
3737 else if (!list_empty(&mddev->disks))
3740 if (cmd_match(buf, "none")) {
3741 mddev->persistent = 0;
3742 mddev->external = 0;
3743 mddev->major_version = 0;
3744 mddev->minor_version = 90;
3747 if (strncmp(buf, "external:", 9) == 0) {
3748 size_t namelen = len-9;
3749 if (namelen >= sizeof(mddev->metadata_type))
3750 namelen = sizeof(mddev->metadata_type)-1;
3751 strncpy(mddev->metadata_type, buf+9, namelen);
3752 mddev->metadata_type[namelen] = 0;
3753 if (namelen && mddev->metadata_type[namelen-1] == '\n')
3754 mddev->metadata_type[--namelen] = 0;
3755 mddev->persistent = 0;
3756 mddev->external = 1;
3757 mddev->major_version = 0;
3758 mddev->minor_version = 90;
3761 major = simple_strtoul(buf, &e, 10);
3762 if (e==buf || *e != '.')
3765 minor = simple_strtoul(buf, &e, 10);
3766 if (e==buf || (*e && *e != '\n') )
3768 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
3770 mddev->major_version = major;
3771 mddev->minor_version = minor;
3772 mddev->persistent = 1;
3773 mddev->external = 0;
3777 static struct md_sysfs_entry md_metadata =
3778 __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
3781 action_show(mddev_t *mddev, char *page)
3783 char *type = "idle";
3784 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
3786 else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3787 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) {
3788 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
3790 else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
3791 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
3793 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
3797 } else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
3800 return sprintf(page, "%s\n", type);
3803 static void reap_sync_thread(mddev_t *mddev);
3806 action_store(mddev_t *mddev, const char *page, size_t len)
3808 if (!mddev->pers || !mddev->pers->sync_request)
3811 if (cmd_match(page, "frozen"))
3812 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3814 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3816 if (cmd_match(page, "idle") || cmd_match(page, "frozen")) {
3817 if (mddev->sync_thread) {
3818 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
3819 reap_sync_thread(mddev);
3821 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3822 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
3824 else if (cmd_match(page, "resync"))
3825 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3826 else if (cmd_match(page, "recover")) {
3827 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
3828 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3829 } else if (cmd_match(page, "reshape")) {
3831 if (mddev->pers->start_reshape == NULL)
3833 err = mddev->pers->start_reshape(mddev);
3836 sysfs_notify(&mddev->kobj, NULL, "degraded");
3838 if (cmd_match(page, "check"))
3839 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
3840 else if (!cmd_match(page, "repair"))
3842 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
3843 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
3845 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3846 md_wakeup_thread(mddev->thread);
3847 sysfs_notify_dirent_safe(mddev->sysfs_action);
3852 mismatch_cnt_show(mddev_t *mddev, char *page)
3854 return sprintf(page, "%llu\n",
3855 (unsigned long long) mddev->resync_mismatches);
3858 static struct md_sysfs_entry md_scan_mode =
3859 __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
3862 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
3865 sync_min_show(mddev_t *mddev, char *page)
3867 return sprintf(page, "%d (%s)\n", speed_min(mddev),
3868 mddev->sync_speed_min ? "local": "system");
3872 sync_min_store(mddev_t *mddev, const char *buf, size_t len)
3876 if (strncmp(buf, "system", 6)==0) {
3877 mddev->sync_speed_min = 0;
3880 min = simple_strtoul(buf, &e, 10);
3881 if (buf == e || (*e && *e != '\n') || min <= 0)
3883 mddev->sync_speed_min = min;
3887 static struct md_sysfs_entry md_sync_min =
3888 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
3891 sync_max_show(mddev_t *mddev, char *page)
3893 return sprintf(page, "%d (%s)\n", speed_max(mddev),
3894 mddev->sync_speed_max ? "local": "system");
3898 sync_max_store(mddev_t *mddev, const char *buf, size_t len)
3902 if (strncmp(buf, "system", 6)==0) {
3903 mddev->sync_speed_max = 0;
3906 max = simple_strtoul(buf, &e, 10);
3907 if (buf == e || (*e && *e != '\n') || max <= 0)
3909 mddev->sync_speed_max = max;
3913 static struct md_sysfs_entry md_sync_max =
3914 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
3917 degraded_show(mddev_t *mddev, char *page)
3919 return sprintf(page, "%d\n", mddev->degraded);
3921 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
3924 sync_force_parallel_show(mddev_t *mddev, char *page)
3926 return sprintf(page, "%d\n", mddev->parallel_resync);
3930 sync_force_parallel_store(mddev_t *mddev, const char *buf, size_t len)
3934 if (strict_strtol(buf, 10, &n))
3937 if (n != 0 && n != 1)
3940 mddev->parallel_resync = n;
3942 if (mddev->sync_thread)
3943 wake_up(&resync_wait);
3948 /* force parallel resync, even with shared block devices */
3949 static struct md_sysfs_entry md_sync_force_parallel =
3950 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
3951 sync_force_parallel_show, sync_force_parallel_store);
3954 sync_speed_show(mddev_t *mddev, char *page)
3956 unsigned long resync, dt, db;
3957 if (mddev->curr_resync == 0)
3958 return sprintf(page, "none\n");
3959 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
3960 dt = (jiffies - mddev->resync_mark) / HZ;
3962 db = resync - mddev->resync_mark_cnt;
3963 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
3966 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
3969 sync_completed_show(mddev_t *mddev, char *page)
3971 unsigned long long max_sectors, resync;
3973 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3974 return sprintf(page, "none\n");
3976 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
3977 max_sectors = mddev->resync_max_sectors;
3979 max_sectors = mddev->dev_sectors;
3981 resync = mddev->curr_resync_completed;
3982 return sprintf(page, "%llu / %llu\n", resync, max_sectors);
3985 static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed);
3988 min_sync_show(mddev_t *mddev, char *page)
3990 return sprintf(page, "%llu\n",
3991 (unsigned long long)mddev->resync_min);
3994 min_sync_store(mddev_t *mddev, const char *buf, size_t len)
3996 unsigned long long min;
3997 if (strict_strtoull(buf, 10, &min))
3999 if (min > mddev->resync_max)
4001 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4004 /* Must be a multiple of chunk_size */
4005 if (mddev->chunk_sectors) {
4006 sector_t temp = min;
4007 if (sector_div(temp, mddev->chunk_sectors))
4010 mddev->resync_min = min;
4015 static struct md_sysfs_entry md_min_sync =
4016 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
4019 max_sync_show(mddev_t *mddev, char *page)
4021 if (mddev->resync_max == MaxSector)
4022 return sprintf(page, "max\n");
4024 return sprintf(page, "%llu\n",
4025 (unsigned long long)mddev->resync_max);
4028 max_sync_store(mddev_t *mddev, const char *buf, size_t len)
4030 if (strncmp(buf, "max", 3) == 0)
4031 mddev->resync_max = MaxSector;
4033 unsigned long long max;
4034 if (strict_strtoull(buf, 10, &max))
4036 if (max < mddev->resync_min)
4038 if (max < mddev->resync_max &&
4040 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4043 /* Must be a multiple of chunk_size */
4044 if (mddev->chunk_sectors) {
4045 sector_t temp = max;
4046 if (sector_div(temp, mddev->chunk_sectors))
4049 mddev->resync_max = max;
4051 wake_up(&mddev->recovery_wait);
4055 static struct md_sysfs_entry md_max_sync =
4056 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
4059 suspend_lo_show(mddev_t *mddev, char *page)
4061 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
4065 suspend_lo_store(mddev_t *mddev, const char *buf, size_t len)
4068 unsigned long long new = simple_strtoull(buf, &e, 10);
4069 unsigned long long old = mddev->suspend_lo;
4071 if (mddev->pers == NULL ||
4072 mddev->pers->quiesce == NULL)
4074 if (buf == e || (*e && *e != '\n'))
4077 mddev->suspend_lo = new;
4079 /* Shrinking suspended region */
4080 mddev->pers->quiesce(mddev, 2);
4082 /* Expanding suspended region - need to wait */
4083 mddev->pers->quiesce(mddev, 1);
4084 mddev->pers->quiesce(mddev, 0);
4088 static struct md_sysfs_entry md_suspend_lo =
4089 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
4093 suspend_hi_show(mddev_t *mddev, char *page)
4095 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
4099 suspend_hi_store(mddev_t *mddev, const char *buf, size_t len)
4102 unsigned long long new = simple_strtoull(buf, &e, 10);
4103 unsigned long long old = mddev->suspend_hi;
4105 if (mddev->pers == NULL ||
4106 mddev->pers->quiesce == NULL)
4108 if (buf == e || (*e && *e != '\n'))
4111 mddev->suspend_hi = new;
4113 /* Shrinking suspended region */
4114 mddev->pers->quiesce(mddev, 2);
4116 /* Expanding suspended region - need to wait */
4117 mddev->pers->quiesce(mddev, 1);
4118 mddev->pers->quiesce(mddev, 0);
4122 static struct md_sysfs_entry md_suspend_hi =
4123 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
4126 reshape_position_show(mddev_t *mddev, char *page)
4128 if (mddev->reshape_position != MaxSector)
4129 return sprintf(page, "%llu\n",
4130 (unsigned long long)mddev->reshape_position);
4131 strcpy(page, "none\n");
4136 reshape_position_store(mddev_t *mddev, const char *buf, size_t len)
4139 unsigned long long new = simple_strtoull(buf, &e, 10);
4142 if (buf == e || (*e && *e != '\n'))
4144 mddev->reshape_position = new;
4145 mddev->delta_disks = 0;
4146 mddev->new_level = mddev->level;
4147 mddev->new_layout = mddev->layout;
4148 mddev->new_chunk_sectors = mddev->chunk_sectors;
4152 static struct md_sysfs_entry md_reshape_position =
4153 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
4154 reshape_position_store);
4157 array_size_show(mddev_t *mddev, char *page)
4159 if (mddev->external_size)
4160 return sprintf(page, "%llu\n",
4161 (unsigned long long)mddev->array_sectors/2);
4163 return sprintf(page, "default\n");
4167 array_size_store(mddev_t *mddev, const char *buf, size_t len)
4171 if (strncmp(buf, "default", 7) == 0) {
4173 sectors = mddev->pers->size(mddev, 0, 0);
4175 sectors = mddev->array_sectors;
4177 mddev->external_size = 0;
4179 if (strict_blocks_to_sectors(buf, §ors) < 0)
4181 if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors)
4184 mddev->external_size = 1;
4187 mddev->array_sectors = sectors;
4189 set_capacity(mddev->gendisk, mddev->array_sectors);
4190 revalidate_disk(mddev->gendisk);
4195 static struct md_sysfs_entry md_array_size =
4196 __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show,
4199 static struct attribute *md_default_attrs[] = {
4202 &md_raid_disks.attr,
4203 &md_chunk_size.attr,
4205 &md_resync_start.attr,
4207 &md_new_device.attr,
4208 &md_safe_delay.attr,
4209 &md_array_state.attr,
4210 &md_reshape_position.attr,
4211 &md_array_size.attr,
4212 &max_corr_read_errors.attr,
4216 static struct attribute *md_redundancy_attrs[] = {
4218 &md_mismatches.attr,
4221 &md_sync_speed.attr,
4222 &md_sync_force_parallel.attr,
4223 &md_sync_completed.attr,
4226 &md_suspend_lo.attr,
4227 &md_suspend_hi.attr,
4232 static struct attribute_group md_redundancy_group = {
4234 .attrs = md_redundancy_attrs,
4239 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
4241 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
4242 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
4247 rv = mddev_lock(mddev);
4249 rv = entry->show(mddev, page);
4250 mddev_unlock(mddev);
4256 md_attr_store(struct kobject *kobj, struct attribute *attr,
4257 const char *page, size_t length)
4259 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
4260 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
4265 if (!capable(CAP_SYS_ADMIN))
4267 rv = mddev_lock(mddev);
4268 if (mddev->hold_active == UNTIL_IOCTL)
4269 mddev->hold_active = 0;
4271 rv = entry->store(mddev, page, length);
4272 mddev_unlock(mddev);
4277 static void md_free(struct kobject *ko)
4279 mddev_t *mddev = container_of(ko, mddev_t, kobj);
4281 if (mddev->sysfs_state)
4282 sysfs_put(mddev->sysfs_state);
4284 if (mddev->gendisk) {
4285 del_gendisk(mddev->gendisk);
4286 put_disk(mddev->gendisk);
4289 blk_cleanup_queue(mddev->queue);
4294 static const struct sysfs_ops md_sysfs_ops = {
4295 .show = md_attr_show,
4296 .store = md_attr_store,
4298 static struct kobj_type md_ktype = {
4300 .sysfs_ops = &md_sysfs_ops,
4301 .default_attrs = md_default_attrs,
4306 static void mddev_delayed_delete(struct work_struct *ws)
4308 mddev_t *mddev = container_of(ws, mddev_t, del_work);
4310 sysfs_remove_group(&mddev->kobj, &md_bitmap_group);
4311 kobject_del(&mddev->kobj);
4312 kobject_put(&mddev->kobj);
4315 static int md_alloc(dev_t dev, char *name)
4317 static DEFINE_MUTEX(disks_mutex);
4318 mddev_t *mddev = mddev_find(dev);
4319 struct gendisk *disk;
4328 partitioned = (MAJOR(mddev->unit) != MD_MAJOR);
4329 shift = partitioned ? MdpMinorShift : 0;
4330 unit = MINOR(mddev->unit) >> shift;
4332 /* wait for any previous instance of this device to be
4333 * completely removed (mddev_delayed_delete).
4335 flush_workqueue(md_misc_wq);
4337 mutex_lock(&disks_mutex);
4343 /* Need to ensure that 'name' is not a duplicate.
4346 spin_lock(&all_mddevs_lock);
4348 list_for_each_entry(mddev2, &all_mddevs, all_mddevs)
4349 if (mddev2->gendisk &&
4350 strcmp(mddev2->gendisk->disk_name, name) == 0) {
4351 spin_unlock(&all_mddevs_lock);
4354 spin_unlock(&all_mddevs_lock);
4358 mddev->queue = blk_alloc_queue(GFP_KERNEL);
4361 mddev->queue->queuedata = mddev;
4363 blk_queue_make_request(mddev->queue, md_make_request);
4365 disk = alloc_disk(1 << shift);
4367 blk_cleanup_queue(mddev->queue);
4368 mddev->queue = NULL;
4371 disk->major = MAJOR(mddev->unit);
4372 disk->first_minor = unit << shift;
4374 strcpy(disk->disk_name, name);
4375 else if (partitioned)
4376 sprintf(disk->disk_name, "md_d%d", unit);
4378 sprintf(disk->disk_name, "md%d", unit);
4379 disk->fops = &md_fops;
4380 disk->private_data = mddev;
4381 disk->queue = mddev->queue;
4382 blk_queue_flush(mddev->queue, REQ_FLUSH | REQ_FUA);
4383 /* Allow extended partitions. This makes the
4384 * 'mdp' device redundant, but we can't really
4387 disk->flags |= GENHD_FL_EXT_DEVT;
4388 mddev->gendisk = disk;
4389 /* As soon as we call add_disk(), another thread could get
4390 * through to md_open, so make sure it doesn't get too far
4392 mutex_lock(&mddev->open_mutex);
4395 error = kobject_init_and_add(&mddev->kobj, &md_ktype,
4396 &disk_to_dev(disk)->kobj, "%s", "md");
4398 /* This isn't possible, but as kobject_init_and_add is marked
4399 * __must_check, we must do something with the result
4401 printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
4405 if (mddev->kobj.sd &&
4406 sysfs_create_group(&mddev->kobj, &md_bitmap_group))
4407 printk(KERN_DEBUG "pointless warning\n");
4408 mutex_unlock(&mddev->open_mutex);
4410 mutex_unlock(&disks_mutex);
4411 if (!error && mddev->kobj.sd) {
4412 kobject_uevent(&mddev->kobj, KOBJ_ADD);
4413 mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state");
4419 static struct kobject *md_probe(dev_t dev, int *part, void *data)
4421 md_alloc(dev, NULL);
4425 static int add_named_array(const char *val, struct kernel_param *kp)
4427 /* val must be "md_*" where * is not all digits.
4428 * We allocate an array with a large free minor number, and
4429 * set the name to val. val must not already be an active name.
4431 int len = strlen(val);
4432 char buf[DISK_NAME_LEN];
4434 while (len && val[len-1] == '\n')
4436 if (len >= DISK_NAME_LEN)
4438 strlcpy(buf, val, len+1);
4439 if (strncmp(buf, "md_", 3) != 0)
4441 return md_alloc(0, buf);
4444 static void md_safemode_timeout(unsigned long data)
4446 mddev_t *mddev = (mddev_t *) data;
4448 if (!atomic_read(&mddev->writes_pending)) {
4449 mddev->safemode = 1;
4450 if (mddev->external)
4451 sysfs_notify_dirent_safe(mddev->sysfs_state);
4453 md_wakeup_thread(mddev->thread);
4456 static int start_dirty_degraded;
4458 int md_run(mddev_t *mddev)
4462 struct mdk_personality *pers;
4464 if (list_empty(&mddev->disks))
4465 /* cannot run an array with no devices.. */
4470 /* Cannot run until previous stop completes properly */
4471 if (mddev->sysfs_active)
4475 * Analyze all RAID superblock(s)
4477 if (!mddev->raid_disks) {
4478 if (!mddev->persistent)
4483 if (mddev->level != LEVEL_NONE)
4484 request_module("md-level-%d", mddev->level);
4485 else if (mddev->clevel[0])
4486 request_module("md-%s", mddev->clevel);
4489 * Drop all container device buffers, from now on
4490 * the only valid external interface is through the md
4493 list_for_each_entry(rdev, &mddev->disks, same_set) {
4494 if (test_bit(Faulty, &rdev->flags))
4496 sync_blockdev(rdev->bdev);
4497 invalidate_bdev(rdev->bdev);
4499 /* perform some consistency tests on the device.
4500 * We don't want the data to overlap the metadata,
4501 * Internal Bitmap issues have been handled elsewhere.
4503 if (rdev->meta_bdev) {
4504 /* Nothing to check */;
4505 } else if (rdev->data_offset < rdev->sb_start) {
4506 if (mddev->dev_sectors &&
4507 rdev->data_offset + mddev->dev_sectors
4509 printk("md: %s: data overlaps metadata\n",
4514 if (rdev->sb_start + rdev->sb_size/512
4515 > rdev->data_offset) {
4516 printk("md: %s: metadata overlaps data\n",
4521 sysfs_notify_dirent_safe(rdev->sysfs_state);
4524 if (mddev->bio_set == NULL)
4525 mddev->bio_set = bioset_create(BIO_POOL_SIZE, sizeof(mddev));
4527 spin_lock(&pers_lock);
4528 pers = find_pers(mddev->level, mddev->clevel);
4529 if (!pers || !try_module_get(pers->owner)) {
4530 spin_unlock(&pers_lock);
4531 if (mddev->level != LEVEL_NONE)
4532 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
4535 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
4540 spin_unlock(&pers_lock);
4541 if (mddev->level != pers->level) {
4542 mddev->level = pers->level;
4543 mddev->new_level = pers->level;
4545 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
4547 if (mddev->reshape_position != MaxSector &&
4548 pers->start_reshape == NULL) {
4549 /* This personality cannot handle reshaping... */
4551 module_put(pers->owner);
4555 if (pers->sync_request) {
4556 /* Warn if this is a potentially silly
4559 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
4563 list_for_each_entry(rdev, &mddev->disks, same_set)
4564 list_for_each_entry(rdev2, &mddev->disks, same_set) {
4566 rdev->bdev->bd_contains ==
4567 rdev2->bdev->bd_contains) {
4569 "%s: WARNING: %s appears to be"
4570 " on the same physical disk as"
4573 bdevname(rdev->bdev,b),
4574 bdevname(rdev2->bdev,b2));
4581 "True protection against single-disk"
4582 " failure might be compromised.\n");
4585 mddev->recovery = 0;
4586 /* may be over-ridden by personality */
4587 mddev->resync_max_sectors = mddev->dev_sectors;
4589 mddev->ok_start_degraded = start_dirty_degraded;
4591 if (start_readonly && mddev->ro == 0)
4592 mddev->ro = 2; /* read-only, but switch on first write */
4594 err = mddev->pers->run(mddev);
4596 printk(KERN_ERR "md: pers->run() failed ...\n");
4597 else if (mddev->pers->size(mddev, 0, 0) < mddev->array_sectors) {
4598 WARN_ONCE(!mddev->external_size, "%s: default size too small,"
4599 " but 'external_size' not in effect?\n", __func__);
4601 "md: invalid array_size %llu > default size %llu\n",
4602 (unsigned long long)mddev->array_sectors / 2,
4603 (unsigned long long)mddev->pers->size(mddev, 0, 0) / 2);
4605 mddev->pers->stop(mddev);
4607 if (err == 0 && mddev->pers->sync_request) {
4608 err = bitmap_create(mddev);
4610 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
4611 mdname(mddev), err);
4612 mddev->pers->stop(mddev);
4616 module_put(mddev->pers->owner);
4618 bitmap_destroy(mddev);
4621 if (mddev->pers->sync_request) {
4622 if (mddev->kobj.sd &&
4623 sysfs_create_group(&mddev->kobj, &md_redundancy_group))
4625 "md: cannot register extra attributes for %s\n",
4627 mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action");
4628 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
4631 atomic_set(&mddev->writes_pending,0);
4632 atomic_set(&mddev->max_corr_read_errors,
4633 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS);
4634 mddev->safemode = 0;
4635 mddev->safemode_timer.function = md_safemode_timeout;
4636 mddev->safemode_timer.data = (unsigned long) mddev;
4637 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
4641 list_for_each_entry(rdev, &mddev->disks, same_set)
4642 if (rdev->raid_disk >= 0) {
4644 sprintf(nm, "rd%d", rdev->raid_disk);
4645 if (sysfs_create_link(&mddev->kobj, &rdev->kobj, nm))
4646 /* failure here is OK */;
4649 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4652 md_update_sb(mddev, 0);
4654 md_new_event(mddev);
4655 sysfs_notify_dirent_safe(mddev->sysfs_state);
4656 sysfs_notify_dirent_safe(mddev->sysfs_action);
4657 sysfs_notify(&mddev->kobj, NULL, "degraded");
4660 EXPORT_SYMBOL_GPL(md_run);
4662 static int do_md_run(mddev_t *mddev)
4666 err = md_run(mddev);
4669 err = bitmap_load(mddev);
4671 bitmap_destroy(mddev);
4675 md_wakeup_thread(mddev->thread);
4676 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
4678 set_capacity(mddev->gendisk, mddev->array_sectors);
4679 revalidate_disk(mddev->gendisk);
4681 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
4686 static int restart_array(mddev_t *mddev)
4688 struct gendisk *disk = mddev->gendisk;
4690 /* Complain if it has no devices */
4691 if (list_empty(&mddev->disks))
4697 mddev->safemode = 0;
4699 set_disk_ro(disk, 0);
4700 printk(KERN_INFO "md: %s switched to read-write mode.\n",
4702 /* Kick recovery or resync if necessary */
4703 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4704 md_wakeup_thread(mddev->thread);
4705 md_wakeup_thread(mddev->sync_thread);
4706 sysfs_notify_dirent_safe(mddev->sysfs_state);
4710 /* similar to deny_write_access, but accounts for our holding a reference
4711 * to the file ourselves */
4712 static int deny_bitmap_write_access(struct file * file)
4714 struct inode *inode = file->f_mapping->host;
4716 spin_lock(&inode->i_lock);
4717 if (atomic_read(&inode->i_writecount) > 1) {
4718 spin_unlock(&inode->i_lock);
4721 atomic_set(&inode->i_writecount, -1);
4722 spin_unlock(&inode->i_lock);
4727 void restore_bitmap_write_access(struct file *file)
4729 struct inode *inode = file->f_mapping->host;
4731 spin_lock(&inode->i_lock);
4732 atomic_set(&inode->i_writecount, 1);
4733 spin_unlock(&inode->i_lock);
4736 static void md_clean(mddev_t *mddev)
4738 mddev->array_sectors = 0;
4739 mddev->external_size = 0;
4740 mddev->dev_sectors = 0;
4741 mddev->raid_disks = 0;
4742 mddev->recovery_cp = 0;
4743 mddev->resync_min = 0;
4744 mddev->resync_max = MaxSector;
4745 mddev->reshape_position = MaxSector;
4746 mddev->external = 0;
4747 mddev->persistent = 0;
4748 mddev->level = LEVEL_NONE;
4749 mddev->clevel[0] = 0;
4752 mddev->metadata_type[0] = 0;
4753 mddev->chunk_sectors = 0;
4754 mddev->ctime = mddev->utime = 0;
4756 mddev->max_disks = 0;
4758 mddev->can_decrease_events = 0;
4759 mddev->delta_disks = 0;
4760 mddev->new_level = LEVEL_NONE;
4761 mddev->new_layout = 0;
4762 mddev->new_chunk_sectors = 0;
4763 mddev->curr_resync = 0;
4764 mddev->resync_mismatches = 0;
4765 mddev->suspend_lo = mddev->suspend_hi = 0;
4766 mddev->sync_speed_min = mddev->sync_speed_max = 0;
4767 mddev->recovery = 0;
4770 mddev->degraded = 0;
4771 mddev->safemode = 0;
4772 mddev->bitmap_info.offset = 0;
4773 mddev->bitmap_info.default_offset = 0;
4774 mddev->bitmap_info.chunksize = 0;
4775 mddev->bitmap_info.daemon_sleep = 0;
4776 mddev->bitmap_info.max_write_behind = 0;
4779 static void __md_stop_writes(mddev_t *mddev)
4781 if (mddev->sync_thread) {
4782 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4783 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4784 reap_sync_thread(mddev);
4787 del_timer_sync(&mddev->safemode_timer);
4789 bitmap_flush(mddev);
4790 md_super_wait(mddev);
4792 if (!mddev->in_sync || mddev->flags) {
4793 /* mark array as shutdown cleanly */
4795 md_update_sb(mddev, 1);
4799 void md_stop_writes(mddev_t *mddev)
4802 __md_stop_writes(mddev);
4803 mddev_unlock(mddev);
4805 EXPORT_SYMBOL_GPL(md_stop_writes);
4807 void md_stop(mddev_t *mddev)
4810 mddev->pers->stop(mddev);
4811 if (mddev->pers->sync_request && mddev->to_remove == NULL)
4812 mddev->to_remove = &md_redundancy_group;
4813 module_put(mddev->pers->owner);
4815 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4817 EXPORT_SYMBOL_GPL(md_stop);
4819 static int md_set_readonly(mddev_t *mddev, int is_open)
4822 mutex_lock(&mddev->open_mutex);
4823 if (atomic_read(&mddev->openers) > is_open) {
4824 printk("md: %s still in use.\n",mdname(mddev));
4829 __md_stop_writes(mddev);
4835 set_disk_ro(mddev->gendisk, 1);
4836 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4837 sysfs_notify_dirent_safe(mddev->sysfs_state);
4841 mutex_unlock(&mddev->open_mutex);
4846 * 0 - completely stop and dis-assemble array
4847 * 2 - stop but do not disassemble array
4849 static int do_md_stop(mddev_t * mddev, int mode, int is_open)
4851 struct gendisk *disk = mddev->gendisk;
4854 mutex_lock(&mddev->open_mutex);
4855 if (atomic_read(&mddev->openers) > is_open ||
4856 mddev->sysfs_active) {
4857 printk("md: %s still in use.\n",mdname(mddev));
4858 mutex_unlock(&mddev->open_mutex);
4864 set_disk_ro(disk, 0);
4866 __md_stop_writes(mddev);
4868 mddev->queue->merge_bvec_fn = NULL;
4869 mddev->queue->backing_dev_info.congested_fn = NULL;
4871 /* tell userspace to handle 'inactive' */
4872 sysfs_notify_dirent_safe(mddev->sysfs_state);
4874 list_for_each_entry(rdev, &mddev->disks, same_set)
4875 if (rdev->raid_disk >= 0) {
4877 sprintf(nm, "rd%d", rdev->raid_disk);
4878 sysfs_remove_link(&mddev->kobj, nm);
4881 set_capacity(disk, 0);
4882 mutex_unlock(&mddev->open_mutex);
4884 revalidate_disk(disk);
4889 mutex_unlock(&mddev->open_mutex);
4891 * Free resources if final stop
4894 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
4896 bitmap_destroy(mddev);
4897 if (mddev->bitmap_info.file) {
4898 restore_bitmap_write_access(mddev->bitmap_info.file);
4899 fput(mddev->bitmap_info.file);
4900 mddev->bitmap_info.file = NULL;
4902 mddev->bitmap_info.offset = 0;
4904 export_array(mddev);
4907 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
4908 if (mddev->hold_active == UNTIL_STOP)
4909 mddev->hold_active = 0;
4911 blk_integrity_unregister(disk);
4912 md_new_event(mddev);
4913 sysfs_notify_dirent_safe(mddev->sysfs_state);
4918 static void autorun_array(mddev_t *mddev)
4923 if (list_empty(&mddev->disks))
4926 printk(KERN_INFO "md: running: ");
4928 list_for_each_entry(rdev, &mddev->disks, same_set) {
4929 char b[BDEVNAME_SIZE];
4930 printk("<%s>", bdevname(rdev->bdev,b));
4934 err = do_md_run(mddev);
4936 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
4937 do_md_stop(mddev, 0, 0);
4942 * lets try to run arrays based on all disks that have arrived
4943 * until now. (those are in pending_raid_disks)
4945 * the method: pick the first pending disk, collect all disks with
4946 * the same UUID, remove all from the pending list and put them into
4947 * the 'same_array' list. Then order this list based on superblock
4948 * update time (freshest comes first), kick out 'old' disks and
4949 * compare superblocks. If everything's fine then run it.
4951 * If "unit" is allocated, then bump its reference count
4953 static void autorun_devices(int part)
4955 mdk_rdev_t *rdev0, *rdev, *tmp;
4957 char b[BDEVNAME_SIZE];
4959 printk(KERN_INFO "md: autorun ...\n");
4960 while (!list_empty(&pending_raid_disks)) {
4963 LIST_HEAD(candidates);
4964 rdev0 = list_entry(pending_raid_disks.next,
4965 mdk_rdev_t, same_set);
4967 printk(KERN_INFO "md: considering %s ...\n",
4968 bdevname(rdev0->bdev,b));
4969 INIT_LIST_HEAD(&candidates);
4970 rdev_for_each_list(rdev, tmp, &pending_raid_disks)
4971 if (super_90_load(rdev, rdev0, 0) >= 0) {
4972 printk(KERN_INFO "md: adding %s ...\n",
4973 bdevname(rdev->bdev,b));
4974 list_move(&rdev->same_set, &candidates);
4977 * now we have a set of devices, with all of them having
4978 * mostly sane superblocks. It's time to allocate the
4982 dev = MKDEV(mdp_major,
4983 rdev0->preferred_minor << MdpMinorShift);
4984 unit = MINOR(dev) >> MdpMinorShift;
4986 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
4989 if (rdev0->preferred_minor != unit) {
4990 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
4991 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
4995 md_probe(dev, NULL, NULL);
4996 mddev = mddev_find(dev);
4997 if (!mddev || !mddev->gendisk) {
5001 "md: cannot allocate memory for md drive.\n");
5004 if (mddev_lock(mddev))
5005 printk(KERN_WARNING "md: %s locked, cannot run\n",
5007 else if (mddev->raid_disks || mddev->major_version
5008 || !list_empty(&mddev->disks)) {
5010 "md: %s already running, cannot run %s\n",
5011 mdname(mddev), bdevname(rdev0->bdev,b));
5012 mddev_unlock(mddev);
5014 printk(KERN_INFO "md: created %s\n", mdname(mddev));
5015 mddev->persistent = 1;
5016 rdev_for_each_list(rdev, tmp, &candidates) {
5017 list_del_init(&rdev->same_set);
5018 if (bind_rdev_to_array(rdev, mddev))
5021 autorun_array(mddev);
5022 mddev_unlock(mddev);
5024 /* on success, candidates will be empty, on error
5027 rdev_for_each_list(rdev, tmp, &candidates) {
5028 list_del_init(&rdev->same_set);
5033 printk(KERN_INFO "md: ... autorun DONE.\n");
5035 #endif /* !MODULE */
5037 static int get_version(void __user * arg)
5041 ver.major = MD_MAJOR_VERSION;
5042 ver.minor = MD_MINOR_VERSION;
5043 ver.patchlevel = MD_PATCHLEVEL_VERSION;
5045 if (copy_to_user(arg, &ver, sizeof(ver)))
5051 static int get_array_info(mddev_t * mddev, void __user * arg)
5053 mdu_array_info_t info;
5054 int nr,working,insync,failed,spare;
5057 nr=working=insync=failed=spare=0;
5058 list_for_each_entry(rdev, &mddev->disks, same_set) {
5060 if (test_bit(Faulty, &rdev->flags))
5064 if (test_bit(In_sync, &rdev->flags))
5071 info.major_version = mddev->major_version;
5072 info.minor_version = mddev->minor_version;
5073 info.patch_version = MD_PATCHLEVEL_VERSION;
5074 info.ctime = mddev->ctime;
5075 info.level = mddev->level;
5076 info.size = mddev->dev_sectors / 2;
5077 if (info.size != mddev->dev_sectors / 2) /* overflow */
5080 info.raid_disks = mddev->raid_disks;
5081 info.md_minor = mddev->md_minor;
5082 info.not_persistent= !mddev->persistent;
5084 info.utime = mddev->utime;
5087 info.state = (1<<MD_SB_CLEAN);
5088 if (mddev->bitmap && mddev->bitmap_info.offset)
5089 info.state = (1<<MD_SB_BITMAP_PRESENT);
5090 info.active_disks = insync;
5091 info.working_disks = working;
5092 info.failed_disks = failed;
5093 info.spare_disks = spare;
5095 info.layout = mddev->layout;
5096 info.chunk_size = mddev->chunk_sectors << 9;
5098 if (copy_to_user(arg, &info, sizeof(info)))
5104 static int get_bitmap_file(mddev_t * mddev, void __user * arg)
5106 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
5107 char *ptr, *buf = NULL;
5110 if (md_allow_write(mddev))
5111 file = kmalloc(sizeof(*file), GFP_NOIO);
5113 file = kmalloc(sizeof(*file), GFP_KERNEL);
5118 /* bitmap disabled, zero the first byte and copy out */
5119 if (!mddev->bitmap || !mddev->bitmap->file) {
5120 file->pathname[0] = '\0';
5124 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
5128 ptr = d_path(&mddev->bitmap->file->f_path, buf, sizeof(file->pathname));
5132 strcpy(file->pathname, ptr);
5136 if (copy_to_user(arg, file, sizeof(*file)))
5144 static int get_disk_info(mddev_t * mddev, void __user * arg)
5146 mdu_disk_info_t info;
5149 if (copy_from_user(&info, arg, sizeof(info)))
5152 rdev = find_rdev_nr(mddev, info.number);
5154 info.major = MAJOR(rdev->bdev->bd_dev);
5155 info.minor = MINOR(rdev->bdev->bd_dev);
5156 info.raid_disk = rdev->raid_disk;
5158 if (test_bit(Faulty, &rdev->flags))
5159 info.state |= (1<<MD_DISK_FAULTY);
5160 else if (test_bit(In_sync, &rdev->flags)) {
5161 info.state |= (1<<MD_DISK_ACTIVE);
5162 info.state |= (1<<MD_DISK_SYNC);
5164 if (test_bit(WriteMostly, &rdev->flags))
5165 info.state |= (1<<MD_DISK_WRITEMOSTLY);
5167 info.major = info.minor = 0;
5168 info.raid_disk = -1;
5169 info.state = (1<<MD_DISK_REMOVED);
5172 if (copy_to_user(arg, &info, sizeof(info)))
5178 static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
5180 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
5182 dev_t dev = MKDEV(info->major,info->minor);
5184 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
5187 if (!mddev->raid_disks) {
5189 /* expecting a device which has a superblock */
5190 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
5193 "md: md_import_device returned %ld\n",
5195 return PTR_ERR(rdev);
5197 if (!list_empty(&mddev->disks)) {
5198 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
5199 mdk_rdev_t, same_set);
5200 err = super_types[mddev->major_version]
5201 .load_super(rdev, rdev0, mddev->minor_version);
5204 "md: %s has different UUID to %s\n",
5205 bdevname(rdev->bdev,b),
5206 bdevname(rdev0->bdev,b2));
5211 err = bind_rdev_to_array(rdev, mddev);
5218 * add_new_disk can be used once the array is assembled
5219 * to add "hot spares". They must already have a superblock
5224 if (!mddev->pers->hot_add_disk) {
5226 "%s: personality does not support diskops!\n",
5230 if (mddev->persistent)
5231 rdev = md_import_device(dev, mddev->major_version,
5232 mddev->minor_version);
5234 rdev = md_import_device(dev, -1, -1);
5237 "md: md_import_device returned %ld\n",
5239 return PTR_ERR(rdev);
5241 /* set saved_raid_disk if appropriate */
5242 if (!mddev->persistent) {
5243 if (info->state & (1<<MD_DISK_SYNC) &&
5244 info->raid_disk < mddev->raid_disks) {
5245 rdev->raid_disk = info->raid_disk;
5246 set_bit(In_sync, &rdev->flags);
5248 rdev->raid_disk = -1;
5250 super_types[mddev->major_version].
5251 validate_super(mddev, rdev);
5252 if ((info->state & (1<<MD_DISK_SYNC)) &&
5253 (!test_bit(In_sync, &rdev->flags) ||
5254 rdev->raid_disk != info->raid_disk)) {
5255 /* This was a hot-add request, but events doesn't
5256 * match, so reject it.
5262 if (test_bit(In_sync, &rdev->flags))
5263 rdev->saved_raid_disk = rdev->raid_disk;
5265 rdev->saved_raid_disk = -1;
5267 clear_bit(In_sync, &rdev->flags); /* just to be sure */
5268 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
5269 set_bit(WriteMostly, &rdev->flags);
5271 clear_bit(WriteMostly, &rdev->flags);
5273 rdev->raid_disk = -1;
5274 err = bind_rdev_to_array(rdev, mddev);
5275 if (!err && !mddev->pers->hot_remove_disk) {
5276 /* If there is hot_add_disk but no hot_remove_disk
5277 * then added disks for geometry changes,
5278 * and should be added immediately.
5280 super_types[mddev->major_version].
5281 validate_super(mddev, rdev);
5282 err = mddev->pers->hot_add_disk(mddev, rdev);
5284 unbind_rdev_from_array(rdev);
5289 sysfs_notify_dirent_safe(rdev->sysfs_state);
5291 md_update_sb(mddev, 1);
5292 if (mddev->degraded)
5293 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
5294 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5296 md_new_event(mddev);
5297 md_wakeup_thread(mddev->thread);
5301 /* otherwise, add_new_disk is only allowed
5302 * for major_version==0 superblocks
5304 if (mddev->major_version != 0) {
5305 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
5310 if (!(info->state & (1<<MD_DISK_FAULTY))) {
5312 rdev = md_import_device(dev, -1, 0);
5315 "md: error, md_import_device() returned %ld\n",
5317 return PTR_ERR(rdev);
5319 rdev->desc_nr = info->number;
5320 if (info->raid_disk < mddev->raid_disks)
5321 rdev->raid_disk = info->raid_disk;
5323 rdev->raid_disk = -1;
5325 if (rdev->raid_disk < mddev->raid_disks)
5326 if (info->state & (1<<MD_DISK_SYNC))
5327 set_bit(In_sync, &rdev->flags);
5329 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
5330 set_bit(WriteMostly, &rdev->flags);
5332 if (!mddev->persistent) {
5333 printk(KERN_INFO "md: nonpersistent superblock ...\n");
5334 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
5336 rdev->sb_start = calc_dev_sboffset(rdev);
5337 rdev->sectors = rdev->sb_start;
5339 err = bind_rdev_to_array(rdev, mddev);
5349 static int hot_remove_disk(mddev_t * mddev, dev_t dev)
5351 char b[BDEVNAME_SIZE];
5354 rdev = find_rdev(mddev, dev);
5358 if (rdev->raid_disk >= 0)
5361 kick_rdev_from_array(rdev);
5362 md_update_sb(mddev, 1);
5363 md_new_event(mddev);
5367 printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n",
5368 bdevname(rdev->bdev,b), mdname(mddev));
5372 static int hot_add_disk(mddev_t * mddev, dev_t dev)
5374 char b[BDEVNAME_SIZE];
5381 if (mddev->major_version != 0) {
5382 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
5383 " version-0 superblocks.\n",
5387 if (!mddev->pers->hot_add_disk) {
5389 "%s: personality does not support diskops!\n",
5394 rdev = md_import_device(dev, -1, 0);
5397 "md: error, md_import_device() returned %ld\n",
5402 if (mddev->persistent)
5403 rdev->sb_start = calc_dev_sboffset(rdev);
5405 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
5407 rdev->sectors = rdev->sb_start;
5409 if (test_bit(Faulty, &rdev->flags)) {
5411 "md: can not hot-add faulty %s disk to %s!\n",
5412 bdevname(rdev->bdev,b), mdname(mddev));
5416 clear_bit(In_sync, &rdev->flags);
5418 rdev->saved_raid_disk = -1;
5419 err = bind_rdev_to_array(rdev, mddev);
5424 * The rest should better be atomic, we can have disk failures
5425 * noticed in interrupt contexts ...
5428 rdev->raid_disk = -1;
5430 md_update_sb(mddev, 1);
5433 * Kick recovery, maybe this spare has to be added to the
5434 * array immediately.
5436 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5437 md_wakeup_thread(mddev->thread);
5438 md_new_event(mddev);
5446 static int set_bitmap_file(mddev_t *mddev, int fd)
5451 if (!mddev->pers->quiesce)
5453 if (mddev->recovery || mddev->sync_thread)
5455 /* we should be able to change the bitmap.. */
5461 return -EEXIST; /* cannot add when bitmap is present */
5462 mddev->bitmap_info.file = fget(fd);
5464 if (mddev->bitmap_info.file == NULL) {
5465 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
5470 err = deny_bitmap_write_access(mddev->bitmap_info.file);
5472 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
5474 fput(mddev->bitmap_info.file);
5475 mddev->bitmap_info.file = NULL;
5478 mddev->bitmap_info.offset = 0; /* file overrides offset */
5479 } else if (mddev->bitmap == NULL)
5480 return -ENOENT; /* cannot remove what isn't there */
5483 mddev->pers->quiesce(mddev, 1);
5485 err = bitmap_create(mddev);
5487 err = bitmap_load(mddev);
5489 if (fd < 0 || err) {
5490 bitmap_destroy(mddev);
5491 fd = -1; /* make sure to put the file */
5493 mddev->pers->quiesce(mddev, 0);
5496 if (mddev->bitmap_info.file) {
5497 restore_bitmap_write_access(mddev->bitmap_info.file);
5498 fput(mddev->bitmap_info.file);
5500 mddev->bitmap_info.file = NULL;
5507 * set_array_info is used two different ways
5508 * The original usage is when creating a new array.
5509 * In this usage, raid_disks is > 0 and it together with
5510 * level, size, not_persistent,layout,chunksize determine the
5511 * shape of the array.
5512 * This will always create an array with a type-0.90.0 superblock.
5513 * The newer usage is when assembling an array.
5514 * In this case raid_disks will be 0, and the major_version field is
5515 * use to determine which style super-blocks are to be found on the devices.
5516 * The minor and patch _version numbers are also kept incase the
5517 * super_block handler wishes to interpret them.
5519 static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
5522 if (info->raid_disks == 0) {
5523 /* just setting version number for superblock loading */
5524 if (info->major_version < 0 ||
5525 info->major_version >= ARRAY_SIZE(super_types) ||
5526 super_types[info->major_version].name == NULL) {
5527 /* maybe try to auto-load a module? */
5529 "md: superblock version %d not known\n",
5530 info->major_version);
5533 mddev->major_version = info->major_version;
5534 mddev->minor_version = info->minor_version;
5535 mddev->patch_version = info->patch_version;
5536 mddev->persistent = !info->not_persistent;
5537 /* ensure mddev_put doesn't delete this now that there
5538 * is some minimal configuration.
5540 mddev->ctime = get_seconds();
5543 mddev->major_version = MD_MAJOR_VERSION;
5544 mddev->minor_version = MD_MINOR_VERSION;
5545 mddev->patch_version = MD_PATCHLEVEL_VERSION;
5546 mddev->ctime = get_seconds();
5548 mddev->level = info->level;
5549 mddev->clevel[0] = 0;
5550 mddev->dev_sectors = 2 * (sector_t)info->size;
5551 mddev->raid_disks = info->raid_disks;
5552 /* don't set md_minor, it is determined by which /dev/md* was
5555 if (info->state & (1<<MD_SB_CLEAN))
5556 mddev->recovery_cp = MaxSector;
5558 mddev->recovery_cp = 0;
5559 mddev->persistent = ! info->not_persistent;
5560 mddev->external = 0;
5562 mddev->layout = info->layout;
5563 mddev->chunk_sectors = info->chunk_size >> 9;
5565 mddev->max_disks = MD_SB_DISKS;
5567 if (mddev->persistent)
5569 set_bit(MD_CHANGE_DEVS, &mddev->flags);
5571 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
5572 mddev->bitmap_info.offset = 0;
5574 mddev->reshape_position = MaxSector;
5577 * Generate a 128 bit UUID
5579 get_random_bytes(mddev->uuid, 16);
5581 mddev->new_level = mddev->level;
5582 mddev->new_chunk_sectors = mddev->chunk_sectors;
5583 mddev->new_layout = mddev->layout;
5584 mddev->delta_disks = 0;
5589 void md_set_array_sectors(mddev_t *mddev, sector_t array_sectors)
5591 WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__);
5593 if (mddev->external_size)
5596 mddev->array_sectors = array_sectors;
5598 EXPORT_SYMBOL(md_set_array_sectors);
5600 static int update_size(mddev_t *mddev, sector_t num_sectors)
5604 int fit = (num_sectors == 0);
5606 if (mddev->pers->resize == NULL)
5608 /* The "num_sectors" is the number of sectors of each device that
5609 * is used. This can only make sense for arrays with redundancy.
5610 * linear and raid0 always use whatever space is available. We can only
5611 * consider changing this number if no resync or reconstruction is
5612 * happening, and if the new size is acceptable. It must fit before the
5613 * sb_start or, if that is <data_offset, it must fit before the size
5614 * of each device. If num_sectors is zero, we find the largest size
5617 if (mddev->sync_thread)
5620 /* Sorry, cannot grow a bitmap yet, just remove it,
5624 list_for_each_entry(rdev, &mddev->disks, same_set) {
5625 sector_t avail = rdev->sectors;
5627 if (fit && (num_sectors == 0 || num_sectors > avail))
5628 num_sectors = avail;
5629 if (avail < num_sectors)
5632 rv = mddev->pers->resize(mddev, num_sectors);
5634 revalidate_disk(mddev->gendisk);
5638 static int update_raid_disks(mddev_t *mddev, int raid_disks)
5641 /* change the number of raid disks */
5642 if (mddev->pers->check_reshape == NULL)
5644 if (raid_disks <= 0 ||
5645 (mddev->max_disks && raid_disks >= mddev->max_disks))
5647 if (mddev->sync_thread || mddev->reshape_position != MaxSector)
5649 mddev->delta_disks = raid_disks - mddev->raid_disks;
5651 rv = mddev->pers->check_reshape(mddev);
5653 mddev->delta_disks = 0;
5659 * update_array_info is used to change the configuration of an
5661 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
5662 * fields in the info are checked against the array.
5663 * Any differences that cannot be handled will cause an error.
5664 * Normally, only one change can be managed at a time.
5666 static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
5672 /* calculate expected state,ignoring low bits */
5673 if (mddev->bitmap && mddev->bitmap_info.offset)
5674 state |= (1 << MD_SB_BITMAP_PRESENT);
5676 if (mddev->major_version != info->major_version ||
5677 mddev->minor_version != info->minor_version ||
5678 /* mddev->patch_version != info->patch_version || */
5679 mddev->ctime != info->ctime ||
5680 mddev->level != info->level ||
5681 /* mddev->layout != info->layout || */
5682 !mddev->persistent != info->not_persistent||
5683 mddev->chunk_sectors != info->chunk_size >> 9 ||
5684 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
5685 ((state^info->state) & 0xfffffe00)
5688 /* Check there is only one change */
5689 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
5691 if (mddev->raid_disks != info->raid_disks)
5693 if (mddev->layout != info->layout)
5695 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT))
5702 if (mddev->layout != info->layout) {
5704 * we don't need to do anything at the md level, the
5705 * personality will take care of it all.
5707 if (mddev->pers->check_reshape == NULL)
5710 mddev->new_layout = info->layout;
5711 rv = mddev->pers->check_reshape(mddev);
5713 mddev->new_layout = mddev->layout;
5717 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
5718 rv = update_size(mddev, (sector_t)info->size * 2);
5720 if (mddev->raid_disks != info->raid_disks)
5721 rv = update_raid_disks(mddev, info->raid_disks);
5723 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
5724 if (mddev->pers->quiesce == NULL)
5726 if (mddev->recovery || mddev->sync_thread)
5728 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
5729 /* add the bitmap */
5732 if (mddev->bitmap_info.default_offset == 0)
5734 mddev->bitmap_info.offset =
5735 mddev->bitmap_info.default_offset;
5736 mddev->pers->quiesce(mddev, 1);
5737 rv = bitmap_create(mddev);
5739 rv = bitmap_load(mddev);
5741 bitmap_destroy(mddev);
5742 mddev->pers->quiesce(mddev, 0);
5744 /* remove the bitmap */
5747 if (mddev->bitmap->file)
5749 mddev->pers->quiesce(mddev, 1);
5750 bitmap_destroy(mddev);
5751 mddev->pers->quiesce(mddev, 0);
5752 mddev->bitmap_info.offset = 0;
5755 md_update_sb(mddev, 1);
5759 static int set_disk_faulty(mddev_t *mddev, dev_t dev)
5763 if (mddev->pers == NULL)
5766 rdev = find_rdev(mddev, dev);
5770 md_error(mddev, rdev);
5775 * We have a problem here : there is no easy way to give a CHS
5776 * virtual geometry. We currently pretend that we have a 2 heads
5777 * 4 sectors (with a BIG number of cylinders...). This drives
5778 * dosfs just mad... ;-)
5780 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
5782 mddev_t *mddev = bdev->bd_disk->private_data;
5786 geo->cylinders = mddev->array_sectors / 8;
5790 static int md_ioctl(struct block_device *bdev, fmode_t mode,
5791 unsigned int cmd, unsigned long arg)
5794 void __user *argp = (void __user *)arg;
5795 mddev_t *mddev = NULL;
5798 if (!capable(CAP_SYS_ADMIN))
5802 * Commands dealing with the RAID driver but not any
5808 err = get_version(argp);
5811 case PRINT_RAID_DEBUG:
5819 autostart_arrays(arg);
5826 * Commands creating/starting a new array:
5829 mddev = bdev->bd_disk->private_data;
5836 err = mddev_lock(mddev);
5839 "md: ioctl lock interrupted, reason %d, cmd %d\n",
5846 case SET_ARRAY_INFO:
5848 mdu_array_info_t info;
5850 memset(&info, 0, sizeof(info));
5851 else if (copy_from_user(&info, argp, sizeof(info))) {
5856 err = update_array_info(mddev, &info);
5858 printk(KERN_WARNING "md: couldn't update"
5859 " array info. %d\n", err);
5864 if (!list_empty(&mddev->disks)) {
5866 "md: array %s already has disks!\n",
5871 if (mddev->raid_disks) {
5873 "md: array %s already initialised!\n",
5878 err = set_array_info(mddev, &info);
5880 printk(KERN_WARNING "md: couldn't set"
5881 " array info. %d\n", err);
5891 * Commands querying/configuring an existing array:
5893 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
5894 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
5895 if ((!mddev->raid_disks && !mddev->external)
5896 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
5897 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
5898 && cmd != GET_BITMAP_FILE) {
5904 * Commands even a read-only array can execute:
5908 case GET_ARRAY_INFO:
5909 err = get_array_info(mddev, argp);
5912 case GET_BITMAP_FILE:
5913 err = get_bitmap_file(mddev, argp);
5917 err = get_disk_info(mddev, argp);
5920 case RESTART_ARRAY_RW:
5921 err = restart_array(mddev);
5925 err = do_md_stop(mddev, 0, 1);
5929 err = md_set_readonly(mddev, 1);
5933 if (get_user(ro, (int __user *)(arg))) {
5939 /* if the bdev is going readonly the value of mddev->ro
5940 * does not matter, no writes are coming
5945 /* are we are already prepared for writes? */
5949 /* transitioning to readauto need only happen for
5950 * arrays that call md_write_start
5953 err = restart_array(mddev);
5956 set_disk_ro(mddev->gendisk, 0);
5963 * The remaining ioctls are changing the state of the
5964 * superblock, so we do not allow them on read-only arrays.
5965 * However non-MD ioctls (e.g. get-size) will still come through
5966 * here and hit the 'default' below, so only disallow
5967 * 'md' ioctls, and switch to rw mode if started auto-readonly.
5969 if (_IOC_TYPE(cmd) == MD_MAJOR && mddev->ro && mddev->pers) {
5970 if (mddev->ro == 2) {
5972 sysfs_notify_dirent_safe(mddev->sysfs_state);
5973 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5974 md_wakeup_thread(mddev->thread);
5985 mdu_disk_info_t info;
5986 if (copy_from_user(&info, argp, sizeof(info)))
5989 err = add_new_disk(mddev, &info);
5993 case HOT_REMOVE_DISK:
5994 err = hot_remove_disk(mddev, new_decode_dev(arg));
5998 err = hot_add_disk(mddev, new_decode_dev(arg));
6001 case SET_DISK_FAULTY:
6002 err = set_disk_faulty(mddev, new_decode_dev(arg));
6006 err = do_md_run(mddev);
6009 case SET_BITMAP_FILE:
6010 err = set_bitmap_file(mddev, (int)arg);
6020 if (mddev->hold_active == UNTIL_IOCTL &&
6022 mddev->hold_active = 0;
6023 mddev_unlock(mddev);
6032 #ifdef CONFIG_COMPAT
6033 static int md_compat_ioctl(struct block_device *bdev, fmode_t mode,
6034 unsigned int cmd, unsigned long arg)
6037 case HOT_REMOVE_DISK:
6039 case SET_DISK_FAULTY:
6040 case SET_BITMAP_FILE:
6041 /* These take in integer arg, do not convert */
6044 arg = (unsigned long)compat_ptr(arg);
6048 return md_ioctl(bdev, mode, cmd, arg);
6050 #endif /* CONFIG_COMPAT */
6052 static int md_open(struct block_device *bdev, fmode_t mode)
6055 * Succeed if we can lock the mddev, which confirms that
6056 * it isn't being stopped right now.
6058 mddev_t *mddev = mddev_find(bdev->bd_dev);
6061 if (mddev->gendisk != bdev->bd_disk) {
6062 /* we are racing with mddev_put which is discarding this
6066 /* Wait until bdev->bd_disk is definitely gone */
6067 flush_workqueue(md_misc_wq);
6068 /* Then retry the open from the top */
6069 return -ERESTARTSYS;
6071 BUG_ON(mddev != bdev->bd_disk->private_data);
6073 if ((err = mutex_lock_interruptible(&mddev->open_mutex)))
6077 atomic_inc(&mddev->openers);
6078 mutex_unlock(&mddev->open_mutex);
6080 check_disk_change(bdev);
6085 static int md_release(struct gendisk *disk, fmode_t mode)
6087 mddev_t *mddev = disk->private_data;
6090 atomic_dec(&mddev->openers);
6096 static int md_media_changed(struct gendisk *disk)
6098 mddev_t *mddev = disk->private_data;
6100 return mddev->changed;
6103 static int md_revalidate(struct gendisk *disk)
6105 mddev_t *mddev = disk->private_data;
6110 static const struct block_device_operations md_fops =
6112 .owner = THIS_MODULE,
6114 .release = md_release,
6116 #ifdef CONFIG_COMPAT
6117 .compat_ioctl = md_compat_ioctl,
6119 .getgeo = md_getgeo,
6120 .media_changed = md_media_changed,
6121 .revalidate_disk= md_revalidate,
6124 static int md_thread(void * arg)
6126 mdk_thread_t *thread = arg;
6129 * md_thread is a 'system-thread', it's priority should be very
6130 * high. We avoid resource deadlocks individually in each
6131 * raid personality. (RAID5 does preallocation) We also use RR and
6132 * the very same RT priority as kswapd, thus we will never get
6133 * into a priority inversion deadlock.
6135 * we definitely have to have equal or higher priority than
6136 * bdflush, otherwise bdflush will deadlock if there are too
6137 * many dirty RAID5 blocks.
6140 allow_signal(SIGKILL);
6141 while (!kthread_should_stop()) {
6143 /* We need to wait INTERRUPTIBLE so that
6144 * we don't add to the load-average.
6145 * That means we need to be sure no signals are
6148 if (signal_pending(current))
6149 flush_signals(current);
6151 wait_event_interruptible_timeout
6153 test_bit(THREAD_WAKEUP, &thread->flags)
6154 || kthread_should_stop(),
6157 clear_bit(THREAD_WAKEUP, &thread->flags);
6158 if (!kthread_should_stop())
6159 thread->run(thread->mddev);
6165 void md_wakeup_thread(mdk_thread_t *thread)
6168 dprintk("md: waking up MD thread %s.\n", thread->tsk->comm);
6169 set_bit(THREAD_WAKEUP, &thread->flags);
6170 wake_up(&thread->wqueue);
6174 mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
6177 mdk_thread_t *thread;
6179 thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL);
6183 init_waitqueue_head(&thread->wqueue);
6186 thread->mddev = mddev;
6187 thread->timeout = MAX_SCHEDULE_TIMEOUT;
6188 thread->tsk = kthread_run(md_thread, thread,
6190 mdname(thread->mddev),
6191 name ?: mddev->pers->name);
6192 if (IS_ERR(thread->tsk)) {
6199 void md_unregister_thread(mdk_thread_t **threadp)
6201 mdk_thread_t *thread = *threadp;
6204 dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
6205 /* Locking ensures that mddev_unlock does not wake_up a
6206 * non-existent thread
6208 spin_lock(&pers_lock);
6210 spin_unlock(&pers_lock);
6212 kthread_stop(thread->tsk);
6216 void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
6223 if (!rdev || test_bit(Faulty, &rdev->flags))
6226 if (mddev->external)
6227 set_bit(Blocked, &rdev->flags);
6229 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
6231 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
6232 __builtin_return_address(0),__builtin_return_address(1),
6233 __builtin_return_address(2),__builtin_return_address(3));
6237 if (!mddev->pers->error_handler)
6239 mddev->pers->error_handler(mddev,rdev);
6240 if (mddev->degraded)
6241 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6242 sysfs_notify_dirent_safe(rdev->sysfs_state);
6243 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6244 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6245 md_wakeup_thread(mddev->thread);
6246 if (mddev->event_work.func)
6247 queue_work(md_misc_wq, &mddev->event_work);
6248 md_new_event_inintr(mddev);
6251 /* seq_file implementation /proc/mdstat */
6253 static void status_unused(struct seq_file *seq)
6258 seq_printf(seq, "unused devices: ");
6260 list_for_each_entry(rdev, &pending_raid_disks, same_set) {
6261 char b[BDEVNAME_SIZE];
6263 seq_printf(seq, "%s ",
6264 bdevname(rdev->bdev,b));
6267 seq_printf(seq, "<none>");
6269 seq_printf(seq, "\n");
6273 static void status_resync(struct seq_file *seq, mddev_t * mddev)
6275 sector_t max_sectors, resync, res;
6276 unsigned long dt, db;
6279 unsigned int per_milli;
6281 resync = mddev->curr_resync - atomic_read(&mddev->recovery_active);
6283 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
6284 max_sectors = mddev->resync_max_sectors;
6286 max_sectors = mddev->dev_sectors;
6289 * Should not happen.
6295 /* Pick 'scale' such that (resync>>scale)*1000 will fit
6296 * in a sector_t, and (max_sectors>>scale) will fit in a
6297 * u32, as those are the requirements for sector_div.
6298 * Thus 'scale' must be at least 10
6301 if (sizeof(sector_t) > sizeof(unsigned long)) {
6302 while ( max_sectors/2 > (1ULL<<(scale+32)))
6305 res = (resync>>scale)*1000;
6306 sector_div(res, (u32)((max_sectors>>scale)+1));
6310 int i, x = per_milli/50, y = 20-x;
6311 seq_printf(seq, "[");
6312 for (i = 0; i < x; i++)
6313 seq_printf(seq, "=");
6314 seq_printf(seq, ">");
6315 for (i = 0; i < y; i++)
6316 seq_printf(seq, ".");
6317 seq_printf(seq, "] ");
6319 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
6320 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
6322 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
6324 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
6325 "resync" : "recovery"))),
6326 per_milli/10, per_milli % 10,
6327 (unsigned long long) resync/2,
6328 (unsigned long long) max_sectors/2);
6331 * dt: time from mark until now
6332 * db: blocks written from mark until now
6333 * rt: remaining time
6335 * rt is a sector_t, so could be 32bit or 64bit.
6336 * So we divide before multiply in case it is 32bit and close
6338 * We scale the divisor (db) by 32 to avoid losing precision
6339 * near the end of resync when the number of remaining sectors
6341 * We then divide rt by 32 after multiplying by db to compensate.
6342 * The '+1' avoids division by zero if db is very small.
6344 dt = ((jiffies - mddev->resync_mark) / HZ);
6346 db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active))
6347 - mddev->resync_mark_cnt;
6349 rt = max_sectors - resync; /* number of remaining sectors */
6350 sector_div(rt, db/32+1);
6354 seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60,
6355 ((unsigned long)rt % 60)/6);
6357 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
6360 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
6362 struct list_head *tmp;
6372 spin_lock(&all_mddevs_lock);
6373 list_for_each(tmp,&all_mddevs)
6375 mddev = list_entry(tmp, mddev_t, all_mddevs);
6377 spin_unlock(&all_mddevs_lock);
6380 spin_unlock(&all_mddevs_lock);
6382 return (void*)2;/* tail */
6386 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
6388 struct list_head *tmp;
6389 mddev_t *next_mddev, *mddev = v;
6395 spin_lock(&all_mddevs_lock);
6397 tmp = all_mddevs.next;
6399 tmp = mddev->all_mddevs.next;
6400 if (tmp != &all_mddevs)
6401 next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs));
6403 next_mddev = (void*)2;
6406 spin_unlock(&all_mddevs_lock);
6414 static void md_seq_stop(struct seq_file *seq, void *v)
6418 if (mddev && v != (void*)1 && v != (void*)2)
6422 struct mdstat_info {
6426 static int md_seq_show(struct seq_file *seq, void *v)
6431 struct mdstat_info *mi = seq->private;
6432 struct bitmap *bitmap;
6434 if (v == (void*)1) {
6435 struct mdk_personality *pers;
6436 seq_printf(seq, "Personalities : ");
6437 spin_lock(&pers_lock);
6438 list_for_each_entry(pers, &pers_list, list)
6439 seq_printf(seq, "[%s] ", pers->name);
6441 spin_unlock(&pers_lock);
6442 seq_printf(seq, "\n");
6443 mi->event = atomic_read(&md_event_count);
6446 if (v == (void*)2) {
6451 if (mddev_lock(mddev) < 0)
6454 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
6455 seq_printf(seq, "%s : %sactive", mdname(mddev),
6456 mddev->pers ? "" : "in");
6459 seq_printf(seq, " (read-only)");
6461 seq_printf(seq, " (auto-read-only)");
6462 seq_printf(seq, " %s", mddev->pers->name);
6466 list_for_each_entry(rdev, &mddev->disks, same_set) {
6467 char b[BDEVNAME_SIZE];
6468 seq_printf(seq, " %s[%d]",
6469 bdevname(rdev->bdev,b), rdev->desc_nr);
6470 if (test_bit(WriteMostly, &rdev->flags))
6471 seq_printf(seq, "(W)");
6472 if (test_bit(Faulty, &rdev->flags)) {
6473 seq_printf(seq, "(F)");
6475 } else if (rdev->raid_disk < 0)
6476 seq_printf(seq, "(S)"); /* spare */
6477 sectors += rdev->sectors;
6480 if (!list_empty(&mddev->disks)) {
6482 seq_printf(seq, "\n %llu blocks",
6483 (unsigned long long)
6484 mddev->array_sectors / 2);
6486 seq_printf(seq, "\n %llu blocks",
6487 (unsigned long long)sectors / 2);
6489 if (mddev->persistent) {
6490 if (mddev->major_version != 0 ||
6491 mddev->minor_version != 90) {
6492 seq_printf(seq," super %d.%d",
6493 mddev->major_version,
6494 mddev->minor_version);
6496 } else if (mddev->external)
6497 seq_printf(seq, " super external:%s",
6498 mddev->metadata_type);
6500 seq_printf(seq, " super non-persistent");
6503 mddev->pers->status(seq, mddev);
6504 seq_printf(seq, "\n ");
6505 if (mddev->pers->sync_request) {
6506 if (mddev->curr_resync > 2) {
6507 status_resync(seq, mddev);
6508 seq_printf(seq, "\n ");
6509 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
6510 seq_printf(seq, "\tresync=DELAYED\n ");
6511 else if (mddev->recovery_cp < MaxSector)
6512 seq_printf(seq, "\tresync=PENDING\n ");
6515 seq_printf(seq, "\n ");
6517 if ((bitmap = mddev->bitmap)) {
6518 unsigned long chunk_kb;
6519 unsigned long flags;
6520 spin_lock_irqsave(&bitmap->lock, flags);
6521 chunk_kb = mddev->bitmap_info.chunksize >> 10;
6522 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
6524 bitmap->pages - bitmap->missing_pages,
6526 (bitmap->pages - bitmap->missing_pages)
6527 << (PAGE_SHIFT - 10),
6528 chunk_kb ? chunk_kb : mddev->bitmap_info.chunksize,
6529 chunk_kb ? "KB" : "B");
6531 seq_printf(seq, ", file: ");
6532 seq_path(seq, &bitmap->file->f_path, " \t\n");
6535 seq_printf(seq, "\n");
6536 spin_unlock_irqrestore(&bitmap->lock, flags);
6539 seq_printf(seq, "\n");
6541 mddev_unlock(mddev);
6546 static const struct seq_operations md_seq_ops = {
6547 .start = md_seq_start,
6548 .next = md_seq_next,
6549 .stop = md_seq_stop,
6550 .show = md_seq_show,
6553 static int md_seq_open(struct inode *inode, struct file *file)
6556 struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL);
6560 error = seq_open(file, &md_seq_ops);
6564 struct seq_file *p = file->private_data;
6566 mi->event = atomic_read(&md_event_count);
6571 static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
6573 struct seq_file *m = filp->private_data;
6574 struct mdstat_info *mi = m->private;
6577 poll_wait(filp, &md_event_waiters, wait);
6579 /* always allow read */
6580 mask = POLLIN | POLLRDNORM;
6582 if (mi->event != atomic_read(&md_event_count))
6583 mask |= POLLERR | POLLPRI;
6587 static const struct file_operations md_seq_fops = {
6588 .owner = THIS_MODULE,
6589 .open = md_seq_open,
6591 .llseek = seq_lseek,
6592 .release = seq_release_private,
6593 .poll = mdstat_poll,
6596 int register_md_personality(struct mdk_personality *p)
6598 spin_lock(&pers_lock);
6599 list_add_tail(&p->list, &pers_list);
6600 printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level);
6601 spin_unlock(&pers_lock);
6605 int unregister_md_personality(struct mdk_personality *p)
6607 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
6608 spin_lock(&pers_lock);
6609 list_del_init(&p->list);
6610 spin_unlock(&pers_lock);
6614 static int is_mddev_idle(mddev_t *mddev, int init)
6622 rdev_for_each_rcu(rdev, mddev) {
6623 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
6624 curr_events = (int)part_stat_read(&disk->part0, sectors[0]) +
6625 (int)part_stat_read(&disk->part0, sectors[1]) -
6626 atomic_read(&disk->sync_io);
6627 /* sync IO will cause sync_io to increase before the disk_stats
6628 * as sync_io is counted when a request starts, and
6629 * disk_stats is counted when it completes.
6630 * So resync activity will cause curr_events to be smaller than
6631 * when there was no such activity.
6632 * non-sync IO will cause disk_stat to increase without
6633 * increasing sync_io so curr_events will (eventually)
6634 * be larger than it was before. Once it becomes
6635 * substantially larger, the test below will cause
6636 * the array to appear non-idle, and resync will slow
6638 * If there is a lot of outstanding resync activity when
6639 * we set last_event to curr_events, then all that activity
6640 * completing might cause the array to appear non-idle
6641 * and resync will be slowed down even though there might
6642 * not have been non-resync activity. This will only
6643 * happen once though. 'last_events' will soon reflect
6644 * the state where there is little or no outstanding
6645 * resync requests, and further resync activity will
6646 * always make curr_events less than last_events.
6649 if (init || curr_events - rdev->last_events > 64) {
6650 rdev->last_events = curr_events;
6658 void md_done_sync(mddev_t *mddev, int blocks, int ok)
6660 /* another "blocks" (512byte) blocks have been synced */
6661 atomic_sub(blocks, &mddev->recovery_active);
6662 wake_up(&mddev->recovery_wait);
6664 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6665 md_wakeup_thread(mddev->thread);
6666 // stop recovery, signal do_sync ....
6671 /* md_write_start(mddev, bi)
6672 * If we need to update some array metadata (e.g. 'active' flag
6673 * in superblock) before writing, schedule a superblock update
6674 * and wait for it to complete.
6676 void md_write_start(mddev_t *mddev, struct bio *bi)
6679 if (bio_data_dir(bi) != WRITE)
6682 BUG_ON(mddev->ro == 1);
6683 if (mddev->ro == 2) {
6684 /* need to switch to read/write */
6686 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6687 md_wakeup_thread(mddev->thread);
6688 md_wakeup_thread(mddev->sync_thread);
6691 atomic_inc(&mddev->writes_pending);
6692 if (mddev->safemode == 1)
6693 mddev->safemode = 0;
6694 if (mddev->in_sync) {
6695 spin_lock_irq(&mddev->write_lock);
6696 if (mddev->in_sync) {
6698 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6699 set_bit(MD_CHANGE_PENDING, &mddev->flags);
6700 md_wakeup_thread(mddev->thread);
6703 spin_unlock_irq(&mddev->write_lock);
6706 sysfs_notify_dirent_safe(mddev->sysfs_state);
6707 wait_event(mddev->sb_wait,
6708 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
6711 void md_write_end(mddev_t *mddev)
6713 if (atomic_dec_and_test(&mddev->writes_pending)) {
6714 if (mddev->safemode == 2)
6715 md_wakeup_thread(mddev->thread);
6716 else if (mddev->safemode_delay)
6717 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
6721 /* md_allow_write(mddev)
6722 * Calling this ensures that the array is marked 'active' so that writes
6723 * may proceed without blocking. It is important to call this before
6724 * attempting a GFP_KERNEL allocation while holding the mddev lock.
6725 * Must be called with mddev_lock held.
6727 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
6728 * is dropped, so return -EAGAIN after notifying userspace.
6730 int md_allow_write(mddev_t *mddev)
6736 if (!mddev->pers->sync_request)
6739 spin_lock_irq(&mddev->write_lock);
6740 if (mddev->in_sync) {
6742 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6743 set_bit(MD_CHANGE_PENDING, &mddev->flags);
6744 if (mddev->safemode_delay &&
6745 mddev->safemode == 0)
6746 mddev->safemode = 1;
6747 spin_unlock_irq(&mddev->write_lock);
6748 md_update_sb(mddev, 0);
6749 sysfs_notify_dirent_safe(mddev->sysfs_state);
6751 spin_unlock_irq(&mddev->write_lock);
6753 if (test_bit(MD_CHANGE_PENDING, &mddev->flags))
6758 EXPORT_SYMBOL_GPL(md_allow_write);
6760 #define SYNC_MARKS 10
6761 #define SYNC_MARK_STEP (3*HZ)
6762 void md_do_sync(mddev_t *mddev)
6765 unsigned int currspeed = 0,
6767 sector_t max_sectors,j, io_sectors;
6768 unsigned long mark[SYNC_MARKS];
6769 sector_t mark_cnt[SYNC_MARKS];
6771 struct list_head *tmp;
6772 sector_t last_check;
6777 /* just incase thread restarts... */
6778 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
6780 if (mddev->ro) /* never try to sync a read-only array */
6783 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
6784 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
6785 desc = "data-check";
6786 else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
6787 desc = "requested-resync";
6790 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
6795 /* we overload curr_resync somewhat here.
6796 * 0 == not engaged in resync at all
6797 * 2 == checking that there is no conflict with another sync
6798 * 1 == like 2, but have yielded to allow conflicting resync to
6800 * other == active in resync - this many blocks
6802 * Before starting a resync we must have set curr_resync to
6803 * 2, and then checked that every "conflicting" array has curr_resync
6804 * less than ours. When we find one that is the same or higher
6805 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
6806 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
6807 * This will mean we have to start checking from the beginning again.
6812 mddev->curr_resync = 2;
6815 if (kthread_should_stop())
6816 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6818 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
6820 for_each_mddev(mddev2, tmp) {
6821 if (mddev2 == mddev)
6823 if (!mddev->parallel_resync
6824 && mddev2->curr_resync
6825 && match_mddev_units(mddev, mddev2)) {
6827 if (mddev < mddev2 && mddev->curr_resync == 2) {
6828 /* arbitrarily yield */
6829 mddev->curr_resync = 1;
6830 wake_up(&resync_wait);
6832 if (mddev > mddev2 && mddev->curr_resync == 1)
6833 /* no need to wait here, we can wait the next
6834 * time 'round when curr_resync == 2
6837 /* We need to wait 'interruptible' so as not to
6838 * contribute to the load average, and not to
6839 * be caught by 'softlockup'
6841 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
6842 if (!kthread_should_stop() &&
6843 mddev2->curr_resync >= mddev->curr_resync) {
6844 printk(KERN_INFO "md: delaying %s of %s"
6845 " until %s has finished (they"
6846 " share one or more physical units)\n",
6847 desc, mdname(mddev), mdname(mddev2));
6849 if (signal_pending(current))
6850 flush_signals(current);
6852 finish_wait(&resync_wait, &wq);
6855 finish_wait(&resync_wait, &wq);
6858 } while (mddev->curr_resync < 2);
6861 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
6862 /* resync follows the size requested by the personality,
6863 * which defaults to physical size, but can be virtual size
6865 max_sectors = mddev->resync_max_sectors;
6866 mddev->resync_mismatches = 0;
6867 /* we don't use the checkpoint if there's a bitmap */
6868 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
6869 j = mddev->resync_min;
6870 else if (!mddev->bitmap)
6871 j = mddev->recovery_cp;
6873 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
6874 max_sectors = mddev->dev_sectors;
6876 /* recovery follows the physical size of devices */
6877 max_sectors = mddev->dev_sectors;
6880 list_for_each_entry_rcu(rdev, &mddev->disks, same_set)
6881 if (rdev->raid_disk >= 0 &&
6882 !test_bit(Faulty, &rdev->flags) &&
6883 !test_bit(In_sync, &rdev->flags) &&
6884 rdev->recovery_offset < j)
6885 j = rdev->recovery_offset;
6889 printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev));
6890 printk(KERN_INFO "md: minimum _guaranteed_ speed:"
6891 " %d KB/sec/disk.\n", speed_min(mddev));
6892 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
6893 "(but not more than %d KB/sec) for %s.\n",
6894 speed_max(mddev), desc);
6896 is_mddev_idle(mddev, 1); /* this initializes IO event counters */
6899 for (m = 0; m < SYNC_MARKS; m++) {
6901 mark_cnt[m] = io_sectors;
6904 mddev->resync_mark = mark[last_mark];
6905 mddev->resync_mark_cnt = mark_cnt[last_mark];
6908 * Tune reconstruction:
6910 window = 32*(PAGE_SIZE/512);
6911 printk(KERN_INFO "md: using %dk window, over a total of %lluk.\n",
6912 window/2, (unsigned long long)max_sectors/2);
6914 atomic_set(&mddev->recovery_active, 0);
6919 "md: resuming %s of %s from checkpoint.\n",
6920 desc, mdname(mddev));
6921 mddev->curr_resync = j;
6923 mddev->curr_resync_completed = j;
6925 while (j < max_sectors) {
6930 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
6931 ((mddev->curr_resync > mddev->curr_resync_completed &&
6932 (mddev->curr_resync - mddev->curr_resync_completed)
6933 > (max_sectors >> 4)) ||
6934 (j - mddev->curr_resync_completed)*2
6935 >= mddev->resync_max - mddev->curr_resync_completed
6937 /* time to update curr_resync_completed */
6938 wait_event(mddev->recovery_wait,
6939 atomic_read(&mddev->recovery_active) == 0);
6940 mddev->curr_resync_completed = j;
6941 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6942 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
6945 while (j >= mddev->resync_max && !kthread_should_stop()) {
6946 /* As this condition is controlled by user-space,
6947 * we can block indefinitely, so use '_interruptible'
6948 * to avoid triggering warnings.
6950 flush_signals(current); /* just in case */
6951 wait_event_interruptible(mddev->recovery_wait,
6952 mddev->resync_max > j
6953 || kthread_should_stop());
6956 if (kthread_should_stop())
6959 sectors = mddev->pers->sync_request(mddev, j, &skipped,
6960 currspeed < speed_min(mddev));
6962 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6966 if (!skipped) { /* actual IO requested */
6967 io_sectors += sectors;
6968 atomic_add(sectors, &mddev->recovery_active);
6972 if (j>1) mddev->curr_resync = j;
6973 mddev->curr_mark_cnt = io_sectors;
6974 if (last_check == 0)
6975 /* this is the earliers that rebuilt will be
6976 * visible in /proc/mdstat
6978 md_new_event(mddev);
6980 if (last_check + window > io_sectors || j == max_sectors)
6983 last_check = io_sectors;
6985 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
6989 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
6991 int next = (last_mark+1) % SYNC_MARKS;
6993 mddev->resync_mark = mark[next];
6994 mddev->resync_mark_cnt = mark_cnt[next];
6995 mark[next] = jiffies;
6996 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
7001 if (kthread_should_stop())
7006 * this loop exits only if either when we are slower than
7007 * the 'hard' speed limit, or the system was IO-idle for
7009 * the system might be non-idle CPU-wise, but we only care
7010 * about not overloading the IO subsystem. (things like an
7011 * e2fsck being done on the RAID array should execute fast)
7015 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
7016 /((jiffies-mddev->resync_mark)/HZ +1) +1;
7018 if (currspeed > speed_min(mddev)) {
7019 if ((currspeed > speed_max(mddev)) ||
7020 !is_mddev_idle(mddev, 0)) {
7026 printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc);
7028 * this also signals 'finished resyncing' to md_stop
7031 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
7033 /* tell personality that we are finished */
7034 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
7036 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
7037 mddev->curr_resync > 2) {
7038 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
7039 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
7040 if (mddev->curr_resync >= mddev->recovery_cp) {
7042 "md: checkpointing %s of %s.\n",
7043 desc, mdname(mddev));
7044 mddev->recovery_cp = mddev->curr_resync;
7047 mddev->recovery_cp = MaxSector;
7049 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
7050 mddev->curr_resync = MaxSector;
7052 list_for_each_entry_rcu(rdev, &mddev->disks, same_set)
7053 if (rdev->raid_disk >= 0 &&
7054 mddev->delta_disks >= 0 &&
7055 !test_bit(Faulty, &rdev->flags) &&
7056 !test_bit(In_sync, &rdev->flags) &&
7057 rdev->recovery_offset < mddev->curr_resync)
7058 rdev->recovery_offset = mddev->curr_resync;
7062 set_bit(MD_CHANGE_DEVS, &mddev->flags);
7065 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
7066 /* We completed so min/max setting can be forgotten if used. */
7067 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
7068 mddev->resync_min = 0;
7069 mddev->resync_max = MaxSector;
7070 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
7071 mddev->resync_min = mddev->curr_resync_completed;
7072 mddev->curr_resync = 0;
7073 wake_up(&resync_wait);
7074 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
7075 md_wakeup_thread(mddev->thread);
7080 * got a signal, exit.
7083 "md: md_do_sync() got signal ... exiting\n");
7084 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7088 EXPORT_SYMBOL_GPL(md_do_sync);
7090 static int remove_and_add_spares(mddev_t *mddev)
7095 mddev->curr_resync_completed = 0;
7097 list_for_each_entry(rdev, &mddev->disks, same_set)
7098 if (rdev->raid_disk >= 0 &&
7099 !test_bit(Blocked, &rdev->flags) &&
7100 (test_bit(Faulty, &rdev->flags) ||
7101 ! test_bit(In_sync, &rdev->flags)) &&
7102 atomic_read(&rdev->nr_pending)==0) {
7103 if (mddev->pers->hot_remove_disk(
7104 mddev, rdev->raid_disk)==0) {
7106 sprintf(nm,"rd%d", rdev->raid_disk);
7107 sysfs_remove_link(&mddev->kobj, nm);
7108 rdev->raid_disk = -1;
7112 if (mddev->degraded && !mddev->recovery_disabled) {
7113 list_for_each_entry(rdev, &mddev->disks, same_set) {
7114 if (rdev->raid_disk >= 0 &&
7115 !test_bit(In_sync, &rdev->flags) &&
7116 !test_bit(Faulty, &rdev->flags) &&
7117 !test_bit(Blocked, &rdev->flags))
7119 if (rdev->raid_disk < 0
7120 && !test_bit(Faulty, &rdev->flags)) {
7121 rdev->recovery_offset = 0;
7123 hot_add_disk(mddev, rdev) == 0) {
7125 sprintf(nm, "rd%d", rdev->raid_disk);
7126 if (sysfs_create_link(&mddev->kobj,
7128 /* failure here is OK */;
7130 md_new_event(mddev);
7131 set_bit(MD_CHANGE_DEVS, &mddev->flags);
7140 static void reap_sync_thread(mddev_t *mddev)
7144 /* resync has finished, collect result */
7145 md_unregister_thread(&mddev->sync_thread);
7146 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
7147 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
7149 /* activate any spares */
7150 if (mddev->pers->spare_active(mddev))
7151 sysfs_notify(&mddev->kobj, NULL,
7154 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
7155 mddev->pers->finish_reshape)
7156 mddev->pers->finish_reshape(mddev);
7157 md_update_sb(mddev, 1);
7159 /* if array is no-longer degraded, then any saved_raid_disk
7160 * information must be scrapped
7162 if (!mddev->degraded)
7163 list_for_each_entry(rdev, &mddev->disks, same_set)
7164 rdev->saved_raid_disk = -1;
7166 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7167 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7168 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
7169 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
7170 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
7171 /* flag recovery needed just to double check */
7172 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7173 sysfs_notify_dirent_safe(mddev->sysfs_action);
7174 md_new_event(mddev);
7178 * This routine is regularly called by all per-raid-array threads to
7179 * deal with generic issues like resync and super-block update.
7180 * Raid personalities that don't have a thread (linear/raid0) do not
7181 * need this as they never do any recovery or update the superblock.
7183 * It does not do any resync itself, but rather "forks" off other threads
7184 * to do that as needed.
7185 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
7186 * "->recovery" and create a thread at ->sync_thread.
7187 * When the thread finishes it sets MD_RECOVERY_DONE
7188 * and wakeups up this thread which will reap the thread and finish up.
7189 * This thread also removes any faulty devices (with nr_pending == 0).
7191 * The overall approach is:
7192 * 1/ if the superblock needs updating, update it.
7193 * 2/ If a recovery thread is running, don't do anything else.
7194 * 3/ If recovery has finished, clean up, possibly marking spares active.
7195 * 4/ If there are any faulty devices, remove them.
7196 * 5/ If array is degraded, try to add spares devices
7197 * 6/ If array has spares or is not in-sync, start a resync thread.
7199 void md_check_recovery(mddev_t *mddev)
7201 if (mddev->suspended)
7205 bitmap_daemon_work(mddev);
7210 if (signal_pending(current)) {
7211 if (mddev->pers->sync_request && !mddev->external) {
7212 printk(KERN_INFO "md: %s in immediate safe mode\n",
7214 mddev->safemode = 2;
7216 flush_signals(current);
7219 if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
7222 (mddev->flags & ~ (1<<MD_CHANGE_PENDING)) ||
7223 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
7224 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
7225 (mddev->external == 0 && mddev->safemode == 1) ||
7226 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
7227 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
7231 if (mddev_trylock(mddev)) {
7235 /* Only thing we do on a ro array is remove
7239 list_for_each_entry(rdev, &mddev->disks, same_set)
7240 if (rdev->raid_disk >= 0 &&
7241 !test_bit(Blocked, &rdev->flags) &&
7242 test_bit(Faulty, &rdev->flags) &&
7243 atomic_read(&rdev->nr_pending)==0) {
7244 if (mddev->pers->hot_remove_disk(
7245 mddev, rdev->raid_disk)==0) {
7247 sprintf(nm,"rd%d", rdev->raid_disk);
7248 sysfs_remove_link(&mddev->kobj, nm);
7249 rdev->raid_disk = -1;
7252 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7256 if (!mddev->external) {
7258 spin_lock_irq(&mddev->write_lock);
7259 if (mddev->safemode &&
7260 !atomic_read(&mddev->writes_pending) &&
7262 mddev->recovery_cp == MaxSector) {
7265 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
7267 if (mddev->safemode == 1)
7268 mddev->safemode = 0;
7269 spin_unlock_irq(&mddev->write_lock);
7271 sysfs_notify_dirent_safe(mddev->sysfs_state);
7275 md_update_sb(mddev, 0);
7277 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
7278 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
7279 /* resync/recovery still happening */
7280 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7283 if (mddev->sync_thread) {
7284 reap_sync_thread(mddev);
7287 /* Set RUNNING before clearing NEEDED to avoid
7288 * any transients in the value of "sync_action".
7290 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7291 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7292 /* Clear some bits that don't mean anything, but
7295 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
7296 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
7298 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
7300 /* no recovery is running.
7301 * remove any failed drives, then
7302 * add spares if possible.
7303 * Spare are also removed and re-added, to allow
7304 * the personality to fail the re-add.
7307 if (mddev->reshape_position != MaxSector) {
7308 if (mddev->pers->check_reshape == NULL ||
7309 mddev->pers->check_reshape(mddev) != 0)
7310 /* Cannot proceed */
7312 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
7313 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7314 } else if ((spares = remove_and_add_spares(mddev))) {
7315 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7316 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
7317 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
7318 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7319 } else if (mddev->recovery_cp < MaxSector) {
7320 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7321 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7322 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
7323 /* nothing to be done ... */
7326 if (mddev->pers->sync_request) {
7327 if (spares && mddev->bitmap && ! mddev->bitmap->file) {
7328 /* We are adding a device or devices to an array
7329 * which has the bitmap stored on all devices.
7330 * So make sure all bitmap pages get written
7332 bitmap_write_all(mddev->bitmap);
7334 mddev->sync_thread = md_register_thread(md_do_sync,
7337 if (!mddev->sync_thread) {
7338 printk(KERN_ERR "%s: could not start resync"
7341 /* leave the spares where they are, it shouldn't hurt */
7342 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7343 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7344 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
7345 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
7346 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
7348 md_wakeup_thread(mddev->sync_thread);
7349 sysfs_notify_dirent_safe(mddev->sysfs_action);
7350 md_new_event(mddev);
7353 if (!mddev->sync_thread) {
7354 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7355 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
7357 if (mddev->sysfs_action)
7358 sysfs_notify_dirent_safe(mddev->sysfs_action);
7360 mddev_unlock(mddev);
7364 void md_wait_for_blocked_rdev(mdk_rdev_t *rdev, mddev_t *mddev)
7366 sysfs_notify_dirent_safe(rdev->sysfs_state);
7367 wait_event_timeout(rdev->blocked_wait,
7368 !test_bit(Blocked, &rdev->flags),
7369 msecs_to_jiffies(5000));
7370 rdev_dec_pending(rdev, mddev);
7372 EXPORT_SYMBOL(md_wait_for_blocked_rdev);
7374 static int md_notify_reboot(struct notifier_block *this,
7375 unsigned long code, void *x)
7377 struct list_head *tmp;
7380 if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) {
7382 printk(KERN_INFO "md: stopping all md devices.\n");
7384 for_each_mddev(mddev, tmp)
7385 if (mddev_trylock(mddev)) {
7386 /* Force a switch to readonly even array
7387 * appears to still be in use. Hence
7390 md_set_readonly(mddev, 100);
7391 mddev_unlock(mddev);
7394 * certain more exotic SCSI devices are known to be
7395 * volatile wrt too early system reboots. While the
7396 * right place to handle this issue is the given
7397 * driver, we do want to have a safe RAID driver ...
7404 static struct notifier_block md_notifier = {
7405 .notifier_call = md_notify_reboot,
7407 .priority = INT_MAX, /* before any real devices */
7410 static void md_geninit(void)
7412 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
7414 proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops);
7417 static int __init md_init(void)
7421 md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0);
7425 md_misc_wq = alloc_workqueue("md_misc", 0, 0);
7429 if ((ret = register_blkdev(MD_MAJOR, "md")) < 0)
7432 if ((ret = register_blkdev(0, "mdp")) < 0)
7436 blk_register_region(MKDEV(MD_MAJOR, 0), 1UL<<MINORBITS, THIS_MODULE,
7437 md_probe, NULL, NULL);
7438 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
7439 md_probe, NULL, NULL);
7441 register_reboot_notifier(&md_notifier);
7442 raid_table_header = register_sysctl_table(raid_root_table);
7448 unregister_blkdev(MD_MAJOR, "md");
7450 destroy_workqueue(md_misc_wq);
7452 destroy_workqueue(md_wq);
7460 * Searches all registered partitions for autorun RAID arrays
7464 static LIST_HEAD(all_detected_devices);
7465 struct detected_devices_node {
7466 struct list_head list;
7470 void md_autodetect_dev(dev_t dev)
7472 struct detected_devices_node *node_detected_dev;
7474 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
7475 if (node_detected_dev) {
7476 node_detected_dev->dev = dev;
7477 list_add_tail(&node_detected_dev->list, &all_detected_devices);
7479 printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed"
7480 ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev));
7485 static void autostart_arrays(int part)
7488 struct detected_devices_node *node_detected_dev;
7490 int i_scanned, i_passed;
7495 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
7497 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
7499 node_detected_dev = list_entry(all_detected_devices.next,
7500 struct detected_devices_node, list);
7501 list_del(&node_detected_dev->list);
7502 dev = node_detected_dev->dev;
7503 kfree(node_detected_dev);
7504 rdev = md_import_device(dev,0, 90);
7508 if (test_bit(Faulty, &rdev->flags)) {
7512 set_bit(AutoDetected, &rdev->flags);
7513 list_add(&rdev->same_set, &pending_raid_disks);
7517 printk(KERN_INFO "md: Scanned %d and added %d devices.\n",
7518 i_scanned, i_passed);
7520 autorun_devices(part);
7523 #endif /* !MODULE */
7525 static __exit void md_exit(void)
7528 struct list_head *tmp;
7530 blk_unregister_region(MKDEV(MD_MAJOR,0), 1U << MINORBITS);
7531 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
7533 unregister_blkdev(MD_MAJOR,"md");
7534 unregister_blkdev(mdp_major, "mdp");
7535 unregister_reboot_notifier(&md_notifier);
7536 unregister_sysctl_table(raid_table_header);
7537 remove_proc_entry("mdstat", NULL);
7538 for_each_mddev(mddev, tmp) {
7539 export_array(mddev);
7540 mddev->hold_active = 0;
7542 destroy_workqueue(md_misc_wq);
7543 destroy_workqueue(md_wq);
7546 subsys_initcall(md_init);
7547 module_exit(md_exit)
7549 static int get_ro(char *buffer, struct kernel_param *kp)
7551 return sprintf(buffer, "%d", start_readonly);
7553 static int set_ro(const char *val, struct kernel_param *kp)
7556 int num = simple_strtoul(val, &e, 10);
7557 if (*val && (*e == '\0' || *e == '\n')) {
7558 start_readonly = num;
7564 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
7565 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
7567 module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR);
7569 EXPORT_SYMBOL(register_md_personality);
7570 EXPORT_SYMBOL(unregister_md_personality);
7571 EXPORT_SYMBOL(md_error);
7572 EXPORT_SYMBOL(md_done_sync);
7573 EXPORT_SYMBOL(md_write_start);
7574 EXPORT_SYMBOL(md_write_end);
7575 EXPORT_SYMBOL(md_register_thread);
7576 EXPORT_SYMBOL(md_unregister_thread);
7577 EXPORT_SYMBOL(md_wakeup_thread);
7578 EXPORT_SYMBOL(md_check_recovery);
7579 MODULE_LICENSE("GPL");
7580 MODULE_DESCRIPTION("MD RAID framework");
7582 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);