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 static LIST_HEAD(pers_list);
65 static DEFINE_SPINLOCK(pers_lock);
67 static void md_print_devices(void);
69 static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
70 static struct workqueue_struct *md_wq;
71 static struct workqueue_struct *md_misc_wq;
73 #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
76 * Default number of read corrections we'll attempt on an rdev
77 * before ejecting it from the array. We divide the read error
78 * count by 2 for every hour elapsed between read errors.
80 #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
82 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
83 * is 1000 KB/sec, so the extra system load does not show up that much.
84 * Increase it if you want to have more _guaranteed_ speed. Note that
85 * the RAID driver will use the maximum available bandwidth if the IO
86 * subsystem is idle. There is also an 'absolute maximum' reconstruction
87 * speed limit - in case reconstruction slows down your system despite
90 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
91 * or /sys/block/mdX/md/sync_speed_{min,max}
94 static int sysctl_speed_limit_min = 1000;
95 static int sysctl_speed_limit_max = 200000;
96 static inline int speed_min(mddev_t *mddev)
98 return mddev->sync_speed_min ?
99 mddev->sync_speed_min : sysctl_speed_limit_min;
102 static inline int speed_max(mddev_t *mddev)
104 return mddev->sync_speed_max ?
105 mddev->sync_speed_max : sysctl_speed_limit_max;
108 static struct ctl_table_header *raid_table_header;
110 static ctl_table raid_table[] = {
112 .procname = "speed_limit_min",
113 .data = &sysctl_speed_limit_min,
114 .maxlen = sizeof(int),
115 .mode = S_IRUGO|S_IWUSR,
116 .proc_handler = proc_dointvec,
119 .procname = "speed_limit_max",
120 .data = &sysctl_speed_limit_max,
121 .maxlen = sizeof(int),
122 .mode = S_IRUGO|S_IWUSR,
123 .proc_handler = proc_dointvec,
128 static ctl_table raid_dir_table[] = {
132 .mode = S_IRUGO|S_IXUGO,
138 static ctl_table raid_root_table[] = {
143 .child = raid_dir_table,
148 static const struct block_device_operations md_fops;
150 static int start_readonly;
153 * like bio_clone, but with a local bio set
156 static void mddev_bio_destructor(struct bio *bio)
158 mddev_t *mddev, **mddevp;
163 bio_free(bio, mddev->bio_set);
166 struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs,
172 if (!mddev || !mddev->bio_set)
173 return bio_alloc(gfp_mask, nr_iovecs);
175 b = bio_alloc_bioset(gfp_mask, nr_iovecs,
181 b->bi_destructor = mddev_bio_destructor;
184 EXPORT_SYMBOL_GPL(bio_alloc_mddev);
186 struct bio *bio_clone_mddev(struct bio *bio, gfp_t gfp_mask,
192 if (!mddev || !mddev->bio_set)
193 return bio_clone(bio, gfp_mask);
195 b = bio_alloc_bioset(gfp_mask, bio->bi_max_vecs,
201 b->bi_destructor = mddev_bio_destructor;
203 if (bio_integrity(bio)) {
206 ret = bio_integrity_clone(b, bio, gfp_mask, mddev->bio_set);
216 EXPORT_SYMBOL_GPL(bio_clone_mddev);
219 * We have a system wide 'event count' that is incremented
220 * on any 'interesting' event, and readers of /proc/mdstat
221 * can use 'poll' or 'select' to find out when the event
225 * start array, stop array, error, add device, remove device,
226 * start build, activate spare
228 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
229 static atomic_t md_event_count;
230 void md_new_event(mddev_t *mddev)
232 atomic_inc(&md_event_count);
233 wake_up(&md_event_waiters);
235 EXPORT_SYMBOL_GPL(md_new_event);
237 /* Alternate version that can be called from interrupts
238 * when calling sysfs_notify isn't needed.
240 static void md_new_event_inintr(mddev_t *mddev)
242 atomic_inc(&md_event_count);
243 wake_up(&md_event_waiters);
247 * Enables to iterate over all existing md arrays
248 * all_mddevs_lock protects this list.
250 static LIST_HEAD(all_mddevs);
251 static DEFINE_SPINLOCK(all_mddevs_lock);
255 * iterates through all used mddevs in the system.
256 * We take care to grab the all_mddevs_lock whenever navigating
257 * the list, and to always hold a refcount when unlocked.
258 * Any code which breaks out of this loop while own
259 * a reference to the current mddev and must mddev_put it.
261 #define for_each_mddev(mddev,tmp) \
263 for (({ spin_lock(&all_mddevs_lock); \
264 tmp = all_mddevs.next; \
266 ({ if (tmp != &all_mddevs) \
267 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
268 spin_unlock(&all_mddevs_lock); \
269 if (mddev) mddev_put(mddev); \
270 mddev = list_entry(tmp, mddev_t, all_mddevs); \
271 tmp != &all_mddevs;}); \
272 ({ spin_lock(&all_mddevs_lock); \
277 /* Rather than calling directly into the personality make_request function,
278 * IO requests come here first so that we can check if the device is
279 * being suspended pending a reconfiguration.
280 * We hold a refcount over the call to ->make_request. By the time that
281 * call has finished, the bio has been linked into some internal structure
282 * and so is visible to ->quiesce(), so we don't need the refcount any more.
284 static int md_make_request(struct request_queue *q, struct bio *bio)
286 const int rw = bio_data_dir(bio);
287 mddev_t *mddev = q->queuedata;
290 unsigned int sectors;
292 if (mddev == NULL || mddev->pers == NULL
297 smp_rmb(); /* Ensure implications of 'active' are visible */
299 if (mddev->suspended) {
302 prepare_to_wait(&mddev->sb_wait, &__wait,
303 TASK_UNINTERRUPTIBLE);
304 if (!mddev->suspended)
310 finish_wait(&mddev->sb_wait, &__wait);
312 atomic_inc(&mddev->active_io);
316 * save the sectors now since our bio can
317 * go away inside make_request
319 sectors = bio_sectors(bio);
320 rv = mddev->pers->make_request(mddev, bio);
322 cpu = part_stat_lock();
323 part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]);
324 part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw], sectors);
327 if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended)
328 wake_up(&mddev->sb_wait);
333 /* mddev_suspend makes sure no new requests are submitted
334 * to the device, and that any requests that have been submitted
335 * are completely handled.
336 * Once ->stop is called and completes, the module will be completely
339 void mddev_suspend(mddev_t *mddev)
341 BUG_ON(mddev->suspended);
342 mddev->suspended = 1;
344 wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0);
345 mddev->pers->quiesce(mddev, 1);
347 EXPORT_SYMBOL_GPL(mddev_suspend);
349 void mddev_resume(mddev_t *mddev)
351 mddev->suspended = 0;
352 wake_up(&mddev->sb_wait);
353 mddev->pers->quiesce(mddev, 0);
355 md_wakeup_thread(mddev->thread);
356 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
358 EXPORT_SYMBOL_GPL(mddev_resume);
360 int mddev_congested(mddev_t *mddev, int bits)
362 return mddev->suspended;
364 EXPORT_SYMBOL(mddev_congested);
367 * Generic flush handling for md
370 static void md_end_flush(struct bio *bio, int err)
372 mdk_rdev_t *rdev = bio->bi_private;
373 mddev_t *mddev = rdev->mddev;
375 rdev_dec_pending(rdev, mddev);
377 if (atomic_dec_and_test(&mddev->flush_pending)) {
378 /* The pre-request flush has finished */
379 queue_work(md_wq, &mddev->flush_work);
384 static void md_submit_flush_data(struct work_struct *ws);
386 static void submit_flushes(struct work_struct *ws)
388 mddev_t *mddev = container_of(ws, mddev_t, flush_work);
391 INIT_WORK(&mddev->flush_work, md_submit_flush_data);
392 atomic_set(&mddev->flush_pending, 1);
394 list_for_each_entry_rcu(rdev, &mddev->disks, same_set)
395 if (rdev->raid_disk >= 0 &&
396 !test_bit(Faulty, &rdev->flags)) {
397 /* Take two references, one is dropped
398 * when request finishes, one after
399 * we reclaim rcu_read_lock
402 atomic_inc(&rdev->nr_pending);
403 atomic_inc(&rdev->nr_pending);
405 bi = bio_alloc_mddev(GFP_KERNEL, 0, mddev);
406 bi->bi_end_io = md_end_flush;
407 bi->bi_private = rdev;
408 bi->bi_bdev = rdev->bdev;
409 atomic_inc(&mddev->flush_pending);
410 submit_bio(WRITE_FLUSH, bi);
412 rdev_dec_pending(rdev, mddev);
415 if (atomic_dec_and_test(&mddev->flush_pending))
416 queue_work(md_wq, &mddev->flush_work);
419 static void md_submit_flush_data(struct work_struct *ws)
421 mddev_t *mddev = container_of(ws, mddev_t, flush_work);
422 struct bio *bio = mddev->flush_bio;
424 if (bio->bi_size == 0)
425 /* an empty barrier - all done */
428 bio->bi_rw &= ~REQ_FLUSH;
429 if (mddev->pers->make_request(mddev, bio))
430 generic_make_request(bio);
433 mddev->flush_bio = NULL;
434 wake_up(&mddev->sb_wait);
437 void md_flush_request(mddev_t *mddev, struct bio *bio)
439 spin_lock_irq(&mddev->write_lock);
440 wait_event_lock_irq(mddev->sb_wait,
442 mddev->write_lock, /*nothing*/);
443 mddev->flush_bio = bio;
444 spin_unlock_irq(&mddev->write_lock);
446 INIT_WORK(&mddev->flush_work, submit_flushes);
447 queue_work(md_wq, &mddev->flush_work);
449 EXPORT_SYMBOL(md_flush_request);
451 /* Support for plugging.
452 * This mirrors the plugging support in request_queue, but does not
453 * require having a whole queue or request structures.
454 * We allocate an md_plug_cb for each md device and each thread it gets
455 * plugged on. This links tot the private plug_handle structure in the
456 * personality data where we keep a count of the number of outstanding
457 * plugs so other code can see if a plug is active.
460 struct blk_plug_cb cb;
464 static void plugger_unplug(struct blk_plug_cb *cb)
466 struct md_plug_cb *mdcb = container_of(cb, struct md_plug_cb, cb);
467 if (atomic_dec_and_test(&mdcb->mddev->plug_cnt))
468 md_wakeup_thread(mdcb->mddev->thread);
472 /* Check that an unplug wakeup will come shortly.
473 * If not, wakeup the md thread immediately
475 int mddev_check_plugged(mddev_t *mddev)
477 struct blk_plug *plug = current->plug;
478 struct md_plug_cb *mdcb;
483 list_for_each_entry(mdcb, &plug->cb_list, cb.list) {
484 if (mdcb->cb.callback == plugger_unplug &&
485 mdcb->mddev == mddev) {
486 /* Already on the list, move to top */
487 if (mdcb != list_first_entry(&plug->cb_list,
490 list_move(&mdcb->cb.list, &plug->cb_list);
494 /* Not currently on the callback list */
495 mdcb = kmalloc(sizeof(*mdcb), GFP_ATOMIC);
500 mdcb->cb.callback = plugger_unplug;
501 atomic_inc(&mddev->plug_cnt);
502 list_add(&mdcb->cb.list, &plug->cb_list);
505 EXPORT_SYMBOL_GPL(mddev_check_plugged);
507 static inline mddev_t *mddev_get(mddev_t *mddev)
509 atomic_inc(&mddev->active);
513 static void mddev_delayed_delete(struct work_struct *ws);
515 static void mddev_put(mddev_t *mddev)
517 struct bio_set *bs = NULL;
519 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
521 if (!mddev->raid_disks && list_empty(&mddev->disks) &&
522 mddev->ctime == 0 && !mddev->hold_active) {
523 /* Array is not configured at all, and not held active,
525 list_del(&mddev->all_mddevs);
527 mddev->bio_set = NULL;
528 if (mddev->gendisk) {
529 /* We did a probe so need to clean up. Call
530 * queue_work inside the spinlock so that
531 * flush_workqueue() after mddev_find will
532 * succeed in waiting for the work to be done.
534 INIT_WORK(&mddev->del_work, mddev_delayed_delete);
535 queue_work(md_misc_wq, &mddev->del_work);
539 spin_unlock(&all_mddevs_lock);
544 void mddev_init(mddev_t *mddev)
546 mutex_init(&mddev->open_mutex);
547 mutex_init(&mddev->reconfig_mutex);
548 mutex_init(&mddev->bitmap_info.mutex);
549 INIT_LIST_HEAD(&mddev->disks);
550 INIT_LIST_HEAD(&mddev->all_mddevs);
551 init_timer(&mddev->safemode_timer);
552 atomic_set(&mddev->active, 1);
553 atomic_set(&mddev->openers, 0);
554 atomic_set(&mddev->active_io, 0);
555 atomic_set(&mddev->plug_cnt, 0);
556 spin_lock_init(&mddev->write_lock);
557 atomic_set(&mddev->flush_pending, 0);
558 init_waitqueue_head(&mddev->sb_wait);
559 init_waitqueue_head(&mddev->recovery_wait);
560 mddev->reshape_position = MaxSector;
561 mddev->resync_min = 0;
562 mddev->resync_max = MaxSector;
563 mddev->level = LEVEL_NONE;
565 EXPORT_SYMBOL_GPL(mddev_init);
567 static mddev_t * mddev_find(dev_t unit)
569 mddev_t *mddev, *new = NULL;
571 if (unit && MAJOR(unit) != MD_MAJOR)
572 unit &= ~((1<<MdpMinorShift)-1);
575 spin_lock(&all_mddevs_lock);
578 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
579 if (mddev->unit == unit) {
581 spin_unlock(&all_mddevs_lock);
587 list_add(&new->all_mddevs, &all_mddevs);
588 spin_unlock(&all_mddevs_lock);
589 new->hold_active = UNTIL_IOCTL;
593 /* find an unused unit number */
594 static int next_minor = 512;
595 int start = next_minor;
599 dev = MKDEV(MD_MAJOR, next_minor);
601 if (next_minor > MINORMASK)
603 if (next_minor == start) {
604 /* Oh dear, all in use. */
605 spin_unlock(&all_mddevs_lock);
611 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
612 if (mddev->unit == dev) {
618 new->md_minor = MINOR(dev);
619 new->hold_active = UNTIL_STOP;
620 list_add(&new->all_mddevs, &all_mddevs);
621 spin_unlock(&all_mddevs_lock);
624 spin_unlock(&all_mddevs_lock);
626 new = kzalloc(sizeof(*new), GFP_KERNEL);
631 if (MAJOR(unit) == MD_MAJOR)
632 new->md_minor = MINOR(unit);
634 new->md_minor = MINOR(unit) >> MdpMinorShift;
641 static inline int mddev_lock(mddev_t * mddev)
643 return mutex_lock_interruptible(&mddev->reconfig_mutex);
646 static inline int mddev_is_locked(mddev_t *mddev)
648 return mutex_is_locked(&mddev->reconfig_mutex);
651 static inline int mddev_trylock(mddev_t * mddev)
653 return mutex_trylock(&mddev->reconfig_mutex);
656 static struct attribute_group md_redundancy_group;
658 static void mddev_unlock(mddev_t * mddev)
660 if (mddev->to_remove) {
661 /* These cannot be removed under reconfig_mutex as
662 * an access to the files will try to take reconfig_mutex
663 * while holding the file unremovable, which leads to
665 * So hold set sysfs_active while the remove in happeing,
666 * and anything else which might set ->to_remove or my
667 * otherwise change the sysfs namespace will fail with
668 * -EBUSY if sysfs_active is still set.
669 * We set sysfs_active under reconfig_mutex and elsewhere
670 * test it under the same mutex to ensure its correct value
673 struct attribute_group *to_remove = mddev->to_remove;
674 mddev->to_remove = NULL;
675 mddev->sysfs_active = 1;
676 mutex_unlock(&mddev->reconfig_mutex);
678 if (mddev->kobj.sd) {
679 if (to_remove != &md_redundancy_group)
680 sysfs_remove_group(&mddev->kobj, to_remove);
681 if (mddev->pers == NULL ||
682 mddev->pers->sync_request == NULL) {
683 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
684 if (mddev->sysfs_action)
685 sysfs_put(mddev->sysfs_action);
686 mddev->sysfs_action = NULL;
689 mddev->sysfs_active = 0;
691 mutex_unlock(&mddev->reconfig_mutex);
693 md_wakeup_thread(mddev->thread);
696 static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr)
700 list_for_each_entry(rdev, &mddev->disks, same_set)
701 if (rdev->desc_nr == nr)
707 static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev)
711 list_for_each_entry(rdev, &mddev->disks, same_set)
712 if (rdev->bdev->bd_dev == dev)
718 static struct mdk_personality *find_pers(int level, char *clevel)
720 struct mdk_personality *pers;
721 list_for_each_entry(pers, &pers_list, list) {
722 if (level != LEVEL_NONE && pers->level == level)
724 if (strcmp(pers->name, clevel)==0)
730 /* return the offset of the super block in 512byte sectors */
731 static inline sector_t calc_dev_sboffset(mdk_rdev_t *rdev)
733 sector_t num_sectors = i_size_read(rdev->bdev->bd_inode) / 512;
734 return MD_NEW_SIZE_SECTORS(num_sectors);
737 static int alloc_disk_sb(mdk_rdev_t * rdev)
742 rdev->sb_page = alloc_page(GFP_KERNEL);
743 if (!rdev->sb_page) {
744 printk(KERN_ALERT "md: out of memory.\n");
751 static void free_disk_sb(mdk_rdev_t * rdev)
754 put_page(rdev->sb_page);
756 rdev->sb_page = NULL;
763 static void super_written(struct bio *bio, int error)
765 mdk_rdev_t *rdev = bio->bi_private;
766 mddev_t *mddev = rdev->mddev;
768 if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) {
769 printk("md: super_written gets error=%d, uptodate=%d\n",
770 error, test_bit(BIO_UPTODATE, &bio->bi_flags));
771 WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags));
772 md_error(mddev, rdev);
775 if (atomic_dec_and_test(&mddev->pending_writes))
776 wake_up(&mddev->sb_wait);
780 void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
781 sector_t sector, int size, struct page *page)
783 /* write first size bytes of page to sector of rdev
784 * Increment mddev->pending_writes before returning
785 * and decrement it on completion, waking up sb_wait
786 * if zero is reached.
787 * If an error occurred, call md_error
789 struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, mddev);
791 bio->bi_bdev = rdev->meta_bdev ? rdev->meta_bdev : rdev->bdev;
792 bio->bi_sector = sector;
793 bio_add_page(bio, page, size, 0);
794 bio->bi_private = rdev;
795 bio->bi_end_io = super_written;
797 atomic_inc(&mddev->pending_writes);
798 submit_bio(REQ_WRITE | REQ_SYNC | REQ_FLUSH | REQ_FUA, bio);
801 void md_super_wait(mddev_t *mddev)
803 /* wait for all superblock writes that were scheduled to complete */
806 prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE);
807 if (atomic_read(&mddev->pending_writes)==0)
811 finish_wait(&mddev->sb_wait, &wq);
814 static void bi_complete(struct bio *bio, int error)
816 complete((struct completion*)bio->bi_private);
819 int sync_page_io(mdk_rdev_t *rdev, sector_t sector, int size,
820 struct page *page, int rw, bool metadata_op)
822 struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, rdev->mddev);
823 struct completion event;
828 bio->bi_bdev = (metadata_op && rdev->meta_bdev) ?
829 rdev->meta_bdev : rdev->bdev;
831 bio->bi_sector = sector + rdev->sb_start;
833 bio->bi_sector = sector + rdev->data_offset;
834 bio_add_page(bio, page, size, 0);
835 init_completion(&event);
836 bio->bi_private = &event;
837 bio->bi_end_io = bi_complete;
839 wait_for_completion(&event);
841 ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
845 EXPORT_SYMBOL_GPL(sync_page_io);
847 static int read_disk_sb(mdk_rdev_t * rdev, int size)
849 char b[BDEVNAME_SIZE];
850 if (!rdev->sb_page) {
858 if (!sync_page_io(rdev, 0, size, rdev->sb_page, READ, true))
864 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
865 bdevname(rdev->bdev,b));
869 static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
871 return sb1->set_uuid0 == sb2->set_uuid0 &&
872 sb1->set_uuid1 == sb2->set_uuid1 &&
873 sb1->set_uuid2 == sb2->set_uuid2 &&
874 sb1->set_uuid3 == sb2->set_uuid3;
877 static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
880 mdp_super_t *tmp1, *tmp2;
882 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
883 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
885 if (!tmp1 || !tmp2) {
887 printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n");
895 * nr_disks is not constant
900 ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0);
908 static u32 md_csum_fold(u32 csum)
910 csum = (csum & 0xffff) + (csum >> 16);
911 return (csum & 0xffff) + (csum >> 16);
914 static unsigned int calc_sb_csum(mdp_super_t * sb)
917 u32 *sb32 = (u32*)sb;
919 unsigned int disk_csum, csum;
921 disk_csum = sb->sb_csum;
924 for (i = 0; i < MD_SB_BYTES/4 ; i++)
926 csum = (newcsum & 0xffffffff) + (newcsum>>32);
930 /* This used to use csum_partial, which was wrong for several
931 * reasons including that different results are returned on
932 * different architectures. It isn't critical that we get exactly
933 * the same return value as before (we always csum_fold before
934 * testing, and that removes any differences). However as we
935 * know that csum_partial always returned a 16bit value on
936 * alphas, do a fold to maximise conformity to previous behaviour.
938 sb->sb_csum = md_csum_fold(disk_csum);
940 sb->sb_csum = disk_csum;
947 * Handle superblock details.
948 * We want to be able to handle multiple superblock formats
949 * so we have a common interface to them all, and an array of
950 * different handlers.
951 * We rely on user-space to write the initial superblock, and support
952 * reading and updating of superblocks.
953 * Interface methods are:
954 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
955 * loads and validates a superblock on dev.
956 * if refdev != NULL, compare superblocks on both devices
958 * 0 - dev has a superblock that is compatible with refdev
959 * 1 - dev has a superblock that is compatible and newer than refdev
960 * so dev should be used as the refdev in future
961 * -EINVAL superblock incompatible or invalid
962 * -othererror e.g. -EIO
964 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
965 * Verify that dev is acceptable into mddev.
966 * The first time, mddev->raid_disks will be 0, and data from
967 * dev should be merged in. Subsequent calls check that dev
968 * is new enough. Return 0 or -EINVAL
970 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
971 * Update the superblock for rdev with data in mddev
972 * This does not write to disc.
978 struct module *owner;
979 int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev,
981 int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev);
982 void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev);
983 unsigned long long (*rdev_size_change)(mdk_rdev_t *rdev,
984 sector_t num_sectors);
988 * Check that the given mddev has no bitmap.
990 * This function is called from the run method of all personalities that do not
991 * support bitmaps. It prints an error message and returns non-zero if mddev
992 * has a bitmap. Otherwise, it returns 0.
995 int md_check_no_bitmap(mddev_t *mddev)
997 if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset)
999 printk(KERN_ERR "%s: bitmaps are not supported for %s\n",
1000 mdname(mddev), mddev->pers->name);
1003 EXPORT_SYMBOL(md_check_no_bitmap);
1006 * load_super for 0.90.0
1008 static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
1010 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1015 * Calculate the position of the superblock (512byte sectors),
1016 * it's at the end of the disk.
1018 * It also happens to be a multiple of 4Kb.
1020 rdev->sb_start = calc_dev_sboffset(rdev);
1022 ret = read_disk_sb(rdev, MD_SB_BYTES);
1023 if (ret) return ret;
1027 bdevname(rdev->bdev, b);
1028 sb = page_address(rdev->sb_page);
1030 if (sb->md_magic != MD_SB_MAGIC) {
1031 printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
1036 if (sb->major_version != 0 ||
1037 sb->minor_version < 90 ||
1038 sb->minor_version > 91) {
1039 printk(KERN_WARNING "Bad version number %d.%d on %s\n",
1040 sb->major_version, sb->minor_version,
1045 if (sb->raid_disks <= 0)
1048 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
1049 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
1054 rdev->preferred_minor = sb->md_minor;
1055 rdev->data_offset = 0;
1056 rdev->sb_size = MD_SB_BYTES;
1058 if (sb->level == LEVEL_MULTIPATH)
1061 rdev->desc_nr = sb->this_disk.number;
1067 mdp_super_t *refsb = page_address(refdev->sb_page);
1068 if (!uuid_equal(refsb, sb)) {
1069 printk(KERN_WARNING "md: %s has different UUID to %s\n",
1070 b, bdevname(refdev->bdev,b2));
1073 if (!sb_equal(refsb, sb)) {
1074 printk(KERN_WARNING "md: %s has same UUID"
1075 " but different superblock to %s\n",
1076 b, bdevname(refdev->bdev, b2));
1080 ev2 = md_event(refsb);
1086 rdev->sectors = rdev->sb_start;
1088 if (rdev->sectors < sb->size * 2 && sb->level > 1)
1089 /* "this cannot possibly happen" ... */
1097 * validate_super for 0.90.0
1099 static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
1102 mdp_super_t *sb = page_address(rdev->sb_page);
1103 __u64 ev1 = md_event(sb);
1105 rdev->raid_disk = -1;
1106 clear_bit(Faulty, &rdev->flags);
1107 clear_bit(In_sync, &rdev->flags);
1108 clear_bit(WriteMostly, &rdev->flags);
1110 if (mddev->raid_disks == 0) {
1111 mddev->major_version = 0;
1112 mddev->minor_version = sb->minor_version;
1113 mddev->patch_version = sb->patch_version;
1114 mddev->external = 0;
1115 mddev->chunk_sectors = sb->chunk_size >> 9;
1116 mddev->ctime = sb->ctime;
1117 mddev->utime = sb->utime;
1118 mddev->level = sb->level;
1119 mddev->clevel[0] = 0;
1120 mddev->layout = sb->layout;
1121 mddev->raid_disks = sb->raid_disks;
1122 mddev->dev_sectors = sb->size * 2;
1123 mddev->events = ev1;
1124 mddev->bitmap_info.offset = 0;
1125 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
1127 if (mddev->minor_version >= 91) {
1128 mddev->reshape_position = sb->reshape_position;
1129 mddev->delta_disks = sb->delta_disks;
1130 mddev->new_level = sb->new_level;
1131 mddev->new_layout = sb->new_layout;
1132 mddev->new_chunk_sectors = sb->new_chunk >> 9;
1134 mddev->reshape_position = MaxSector;
1135 mddev->delta_disks = 0;
1136 mddev->new_level = mddev->level;
1137 mddev->new_layout = mddev->layout;
1138 mddev->new_chunk_sectors = mddev->chunk_sectors;
1141 if (sb->state & (1<<MD_SB_CLEAN))
1142 mddev->recovery_cp = MaxSector;
1144 if (sb->events_hi == sb->cp_events_hi &&
1145 sb->events_lo == sb->cp_events_lo) {
1146 mddev->recovery_cp = sb->recovery_cp;
1148 mddev->recovery_cp = 0;
1151 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
1152 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
1153 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
1154 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
1156 mddev->max_disks = MD_SB_DISKS;
1158 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
1159 mddev->bitmap_info.file == NULL)
1160 mddev->bitmap_info.offset =
1161 mddev->bitmap_info.default_offset;
1163 } else if (mddev->pers == NULL) {
1164 /* Insist on good event counter while assembling, except
1165 * for spares (which don't need an event count) */
1167 if (sb->disks[rdev->desc_nr].state & (
1168 (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE)))
1169 if (ev1 < mddev->events)
1171 } else if (mddev->bitmap) {
1172 /* if adding to array with a bitmap, then we can accept an
1173 * older device ... but not too old.
1175 if (ev1 < mddev->bitmap->events_cleared)
1178 if (ev1 < mddev->events)
1179 /* just a hot-add of a new device, leave raid_disk at -1 */
1183 if (mddev->level != LEVEL_MULTIPATH) {
1184 desc = sb->disks + rdev->desc_nr;
1186 if (desc->state & (1<<MD_DISK_FAULTY))
1187 set_bit(Faulty, &rdev->flags);
1188 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
1189 desc->raid_disk < mddev->raid_disks */) {
1190 set_bit(In_sync, &rdev->flags);
1191 rdev->raid_disk = desc->raid_disk;
1192 } else if (desc->state & (1<<MD_DISK_ACTIVE)) {
1193 /* active but not in sync implies recovery up to
1194 * reshape position. We don't know exactly where
1195 * that is, so set to zero for now */
1196 if (mddev->minor_version >= 91) {
1197 rdev->recovery_offset = 0;
1198 rdev->raid_disk = desc->raid_disk;
1201 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
1202 set_bit(WriteMostly, &rdev->flags);
1203 } else /* MULTIPATH are always insync */
1204 set_bit(In_sync, &rdev->flags);
1209 * sync_super for 0.90.0
1211 static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1215 int next_spare = mddev->raid_disks;
1218 /* make rdev->sb match mddev data..
1221 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1222 * 3/ any empty disks < next_spare become removed
1224 * disks[0] gets initialised to REMOVED because
1225 * we cannot be sure from other fields if it has
1226 * been initialised or not.
1229 int active=0, working=0,failed=0,spare=0,nr_disks=0;
1231 rdev->sb_size = MD_SB_BYTES;
1233 sb = page_address(rdev->sb_page);
1235 memset(sb, 0, sizeof(*sb));
1237 sb->md_magic = MD_SB_MAGIC;
1238 sb->major_version = mddev->major_version;
1239 sb->patch_version = mddev->patch_version;
1240 sb->gvalid_words = 0; /* ignored */
1241 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
1242 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
1243 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
1244 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
1246 sb->ctime = mddev->ctime;
1247 sb->level = mddev->level;
1248 sb->size = mddev->dev_sectors / 2;
1249 sb->raid_disks = mddev->raid_disks;
1250 sb->md_minor = mddev->md_minor;
1251 sb->not_persistent = 0;
1252 sb->utime = mddev->utime;
1254 sb->events_hi = (mddev->events>>32);
1255 sb->events_lo = (u32)mddev->events;
1257 if (mddev->reshape_position == MaxSector)
1258 sb->minor_version = 90;
1260 sb->minor_version = 91;
1261 sb->reshape_position = mddev->reshape_position;
1262 sb->new_level = mddev->new_level;
1263 sb->delta_disks = mddev->delta_disks;
1264 sb->new_layout = mddev->new_layout;
1265 sb->new_chunk = mddev->new_chunk_sectors << 9;
1267 mddev->minor_version = sb->minor_version;
1270 sb->recovery_cp = mddev->recovery_cp;
1271 sb->cp_events_hi = (mddev->events>>32);
1272 sb->cp_events_lo = (u32)mddev->events;
1273 if (mddev->recovery_cp == MaxSector)
1274 sb->state = (1<< MD_SB_CLEAN);
1276 sb->recovery_cp = 0;
1278 sb->layout = mddev->layout;
1279 sb->chunk_size = mddev->chunk_sectors << 9;
1281 if (mddev->bitmap && mddev->bitmap_info.file == NULL)
1282 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
1284 sb->disks[0].state = (1<<MD_DISK_REMOVED);
1285 list_for_each_entry(rdev2, &mddev->disks, same_set) {
1288 int is_active = test_bit(In_sync, &rdev2->flags);
1290 if (rdev2->raid_disk >= 0 &&
1291 sb->minor_version >= 91)
1292 /* we have nowhere to store the recovery_offset,
1293 * but if it is not below the reshape_position,
1294 * we can piggy-back on that.
1297 if (rdev2->raid_disk < 0 ||
1298 test_bit(Faulty, &rdev2->flags))
1301 desc_nr = rdev2->raid_disk;
1303 desc_nr = next_spare++;
1304 rdev2->desc_nr = desc_nr;
1305 d = &sb->disks[rdev2->desc_nr];
1307 d->number = rdev2->desc_nr;
1308 d->major = MAJOR(rdev2->bdev->bd_dev);
1309 d->minor = MINOR(rdev2->bdev->bd_dev);
1311 d->raid_disk = rdev2->raid_disk;
1313 d->raid_disk = rdev2->desc_nr; /* compatibility */
1314 if (test_bit(Faulty, &rdev2->flags))
1315 d->state = (1<<MD_DISK_FAULTY);
1316 else if (is_active) {
1317 d->state = (1<<MD_DISK_ACTIVE);
1318 if (test_bit(In_sync, &rdev2->flags))
1319 d->state |= (1<<MD_DISK_SYNC);
1327 if (test_bit(WriteMostly, &rdev2->flags))
1328 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1330 /* now set the "removed" and "faulty" bits on any missing devices */
1331 for (i=0 ; i < mddev->raid_disks ; i++) {
1332 mdp_disk_t *d = &sb->disks[i];
1333 if (d->state == 0 && d->number == 0) {
1336 d->state = (1<<MD_DISK_REMOVED);
1337 d->state |= (1<<MD_DISK_FAULTY);
1341 sb->nr_disks = nr_disks;
1342 sb->active_disks = active;
1343 sb->working_disks = working;
1344 sb->failed_disks = failed;
1345 sb->spare_disks = spare;
1347 sb->this_disk = sb->disks[rdev->desc_nr];
1348 sb->sb_csum = calc_sb_csum(sb);
1352 * rdev_size_change for 0.90.0
1354 static unsigned long long
1355 super_90_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors)
1357 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1358 return 0; /* component must fit device */
1359 if (rdev->mddev->bitmap_info.offset)
1360 return 0; /* can't move bitmap */
1361 rdev->sb_start = calc_dev_sboffset(rdev);
1362 if (!num_sectors || num_sectors > rdev->sb_start)
1363 num_sectors = rdev->sb_start;
1364 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1366 md_super_wait(rdev->mddev);
1372 * version 1 superblock
1375 static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb)
1379 unsigned long long newcsum;
1380 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1381 __le32 *isuper = (__le32*)sb;
1384 disk_csum = sb->sb_csum;
1387 for (i=0; size>=4; size -= 4 )
1388 newcsum += le32_to_cpu(*isuper++);
1391 newcsum += le16_to_cpu(*(__le16*) isuper);
1393 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1394 sb->sb_csum = disk_csum;
1395 return cpu_to_le32(csum);
1398 static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
1400 struct mdp_superblock_1 *sb;
1403 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1407 * Calculate the position of the superblock in 512byte sectors.
1408 * It is always aligned to a 4K boundary and
1409 * depeding on minor_version, it can be:
1410 * 0: At least 8K, but less than 12K, from end of device
1411 * 1: At start of device
1412 * 2: 4K from start of device.
1414 switch(minor_version) {
1416 sb_start = i_size_read(rdev->bdev->bd_inode) >> 9;
1418 sb_start &= ~(sector_t)(4*2-1);
1429 rdev->sb_start = sb_start;
1431 /* superblock is rarely larger than 1K, but it can be larger,
1432 * and it is safe to read 4k, so we do that
1434 ret = read_disk_sb(rdev, 4096);
1435 if (ret) return ret;
1438 sb = page_address(rdev->sb_page);
1440 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1441 sb->major_version != cpu_to_le32(1) ||
1442 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1443 le64_to_cpu(sb->super_offset) != rdev->sb_start ||
1444 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1447 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1448 printk("md: invalid superblock checksum on %s\n",
1449 bdevname(rdev->bdev,b));
1452 if (le64_to_cpu(sb->data_size) < 10) {
1453 printk("md: data_size too small on %s\n",
1454 bdevname(rdev->bdev,b));
1458 rdev->preferred_minor = 0xffff;
1459 rdev->data_offset = le64_to_cpu(sb->data_offset);
1460 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1462 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1463 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1464 if (rdev->sb_size & bmask)
1465 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1468 && rdev->data_offset < sb_start + (rdev->sb_size/512))
1471 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1474 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1480 struct mdp_superblock_1 *refsb = page_address(refdev->sb_page);
1482 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1483 sb->level != refsb->level ||
1484 sb->layout != refsb->layout ||
1485 sb->chunksize != refsb->chunksize) {
1486 printk(KERN_WARNING "md: %s has strangely different"
1487 " superblock to %s\n",
1488 bdevname(rdev->bdev,b),
1489 bdevname(refdev->bdev,b2));
1492 ev1 = le64_to_cpu(sb->events);
1493 ev2 = le64_to_cpu(refsb->events);
1501 rdev->sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) -
1502 le64_to_cpu(sb->data_offset);
1504 rdev->sectors = rdev->sb_start;
1505 if (rdev->sectors < le64_to_cpu(sb->data_size))
1507 rdev->sectors = le64_to_cpu(sb->data_size);
1508 if (le64_to_cpu(sb->size) > rdev->sectors)
1513 static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
1515 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
1516 __u64 ev1 = le64_to_cpu(sb->events);
1518 rdev->raid_disk = -1;
1519 clear_bit(Faulty, &rdev->flags);
1520 clear_bit(In_sync, &rdev->flags);
1521 clear_bit(WriteMostly, &rdev->flags);
1523 if (mddev->raid_disks == 0) {
1524 mddev->major_version = 1;
1525 mddev->patch_version = 0;
1526 mddev->external = 0;
1527 mddev->chunk_sectors = le32_to_cpu(sb->chunksize);
1528 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1529 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1530 mddev->level = le32_to_cpu(sb->level);
1531 mddev->clevel[0] = 0;
1532 mddev->layout = le32_to_cpu(sb->layout);
1533 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1534 mddev->dev_sectors = le64_to_cpu(sb->size);
1535 mddev->events = ev1;
1536 mddev->bitmap_info.offset = 0;
1537 mddev->bitmap_info.default_offset = 1024 >> 9;
1539 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1540 memcpy(mddev->uuid, sb->set_uuid, 16);
1542 mddev->max_disks = (4096-256)/2;
1544 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1545 mddev->bitmap_info.file == NULL )
1546 mddev->bitmap_info.offset =
1547 (__s32)le32_to_cpu(sb->bitmap_offset);
1549 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1550 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1551 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1552 mddev->new_level = le32_to_cpu(sb->new_level);
1553 mddev->new_layout = le32_to_cpu(sb->new_layout);
1554 mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk);
1556 mddev->reshape_position = MaxSector;
1557 mddev->delta_disks = 0;
1558 mddev->new_level = mddev->level;
1559 mddev->new_layout = mddev->layout;
1560 mddev->new_chunk_sectors = mddev->chunk_sectors;
1563 } else if (mddev->pers == NULL) {
1564 /* Insist of good event counter while assembling, except for
1565 * spares (which don't need an event count) */
1567 if (rdev->desc_nr >= 0 &&
1568 rdev->desc_nr < le32_to_cpu(sb->max_dev) &&
1569 le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < 0xfffe)
1570 if (ev1 < mddev->events)
1572 } else if (mddev->bitmap) {
1573 /* If adding to array with a bitmap, then we can accept an
1574 * older device, but not too old.
1576 if (ev1 < mddev->bitmap->events_cleared)
1579 if (ev1 < mddev->events)
1580 /* just a hot-add of a new device, leave raid_disk at -1 */
1583 if (mddev->level != LEVEL_MULTIPATH) {
1585 if (rdev->desc_nr < 0 ||
1586 rdev->desc_nr >= le32_to_cpu(sb->max_dev)) {
1590 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1592 case 0xffff: /* spare */
1594 case 0xfffe: /* faulty */
1595 set_bit(Faulty, &rdev->flags);
1598 if ((le32_to_cpu(sb->feature_map) &
1599 MD_FEATURE_RECOVERY_OFFSET))
1600 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1602 set_bit(In_sync, &rdev->flags);
1603 rdev->raid_disk = role;
1606 if (sb->devflags & WriteMostly1)
1607 set_bit(WriteMostly, &rdev->flags);
1608 } else /* MULTIPATH are always insync */
1609 set_bit(In_sync, &rdev->flags);
1614 static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1616 struct mdp_superblock_1 *sb;
1619 /* make rdev->sb match mddev and rdev data. */
1621 sb = page_address(rdev->sb_page);
1623 sb->feature_map = 0;
1625 sb->recovery_offset = cpu_to_le64(0);
1626 memset(sb->pad1, 0, sizeof(sb->pad1));
1627 memset(sb->pad2, 0, sizeof(sb->pad2));
1628 memset(sb->pad3, 0, sizeof(sb->pad3));
1630 sb->utime = cpu_to_le64((__u64)mddev->utime);
1631 sb->events = cpu_to_le64(mddev->events);
1633 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1635 sb->resync_offset = cpu_to_le64(0);
1637 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
1639 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
1640 sb->size = cpu_to_le64(mddev->dev_sectors);
1641 sb->chunksize = cpu_to_le32(mddev->chunk_sectors);
1642 sb->level = cpu_to_le32(mddev->level);
1643 sb->layout = cpu_to_le32(mddev->layout);
1645 if (mddev->bitmap && mddev->bitmap_info.file == NULL) {
1646 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset);
1647 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
1650 if (rdev->raid_disk >= 0 &&
1651 !test_bit(In_sync, &rdev->flags)) {
1653 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1654 sb->recovery_offset =
1655 cpu_to_le64(rdev->recovery_offset);
1658 if (mddev->reshape_position != MaxSector) {
1659 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1660 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1661 sb->new_layout = cpu_to_le32(mddev->new_layout);
1662 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1663 sb->new_level = cpu_to_le32(mddev->new_level);
1664 sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors);
1668 list_for_each_entry(rdev2, &mddev->disks, same_set)
1669 if (rdev2->desc_nr+1 > max_dev)
1670 max_dev = rdev2->desc_nr+1;
1672 if (max_dev > le32_to_cpu(sb->max_dev)) {
1674 sb->max_dev = cpu_to_le32(max_dev);
1675 rdev->sb_size = max_dev * 2 + 256;
1676 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1677 if (rdev->sb_size & bmask)
1678 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1680 max_dev = le32_to_cpu(sb->max_dev);
1682 for (i=0; i<max_dev;i++)
1683 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1685 list_for_each_entry(rdev2, &mddev->disks, same_set) {
1687 if (test_bit(Faulty, &rdev2->flags))
1688 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1689 else if (test_bit(In_sync, &rdev2->flags))
1690 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1691 else if (rdev2->raid_disk >= 0)
1692 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1694 sb->dev_roles[i] = cpu_to_le16(0xffff);
1697 sb->sb_csum = calc_sb_1_csum(sb);
1700 static unsigned long long
1701 super_1_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors)
1703 struct mdp_superblock_1 *sb;
1704 sector_t max_sectors;
1705 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1706 return 0; /* component must fit device */
1707 if (rdev->sb_start < rdev->data_offset) {
1708 /* minor versions 1 and 2; superblock before data */
1709 max_sectors = i_size_read(rdev->bdev->bd_inode) >> 9;
1710 max_sectors -= rdev->data_offset;
1711 if (!num_sectors || num_sectors > max_sectors)
1712 num_sectors = max_sectors;
1713 } else if (rdev->mddev->bitmap_info.offset) {
1714 /* minor version 0 with bitmap we can't move */
1717 /* minor version 0; superblock after data */
1719 sb_start = (i_size_read(rdev->bdev->bd_inode) >> 9) - 8*2;
1720 sb_start &= ~(sector_t)(4*2 - 1);
1721 max_sectors = rdev->sectors + sb_start - rdev->sb_start;
1722 if (!num_sectors || num_sectors > max_sectors)
1723 num_sectors = max_sectors;
1724 rdev->sb_start = sb_start;
1726 sb = page_address(rdev->sb_page);
1727 sb->data_size = cpu_to_le64(num_sectors);
1728 sb->super_offset = rdev->sb_start;
1729 sb->sb_csum = calc_sb_1_csum(sb);
1730 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1732 md_super_wait(rdev->mddev);
1736 static struct super_type super_types[] = {
1739 .owner = THIS_MODULE,
1740 .load_super = super_90_load,
1741 .validate_super = super_90_validate,
1742 .sync_super = super_90_sync,
1743 .rdev_size_change = super_90_rdev_size_change,
1747 .owner = THIS_MODULE,
1748 .load_super = super_1_load,
1749 .validate_super = super_1_validate,
1750 .sync_super = super_1_sync,
1751 .rdev_size_change = super_1_rdev_size_change,
1755 static void sync_super(mddev_t *mddev, mdk_rdev_t *rdev)
1757 if (mddev->sync_super) {
1758 mddev->sync_super(mddev, rdev);
1762 BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types));
1764 super_types[mddev->major_version].sync_super(mddev, rdev);
1767 static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)
1769 mdk_rdev_t *rdev, *rdev2;
1772 rdev_for_each_rcu(rdev, mddev1)
1773 rdev_for_each_rcu(rdev2, mddev2)
1774 if (rdev->bdev->bd_contains ==
1775 rdev2->bdev->bd_contains) {
1783 static LIST_HEAD(pending_raid_disks);
1786 * Try to register data integrity profile for an mddev
1788 * This is called when an array is started and after a disk has been kicked
1789 * from the array. It only succeeds if all working and active component devices
1790 * are integrity capable with matching profiles.
1792 int md_integrity_register(mddev_t *mddev)
1794 mdk_rdev_t *rdev, *reference = NULL;
1796 if (list_empty(&mddev->disks))
1797 return 0; /* nothing to do */
1798 if (!mddev->gendisk || blk_get_integrity(mddev->gendisk))
1799 return 0; /* shouldn't register, or already is */
1800 list_for_each_entry(rdev, &mddev->disks, same_set) {
1801 /* skip spares and non-functional disks */
1802 if (test_bit(Faulty, &rdev->flags))
1804 if (rdev->raid_disk < 0)
1807 /* Use the first rdev as the reference */
1811 /* does this rdev's profile match the reference profile? */
1812 if (blk_integrity_compare(reference->bdev->bd_disk,
1813 rdev->bdev->bd_disk) < 0)
1816 if (!reference || !bdev_get_integrity(reference->bdev))
1819 * All component devices are integrity capable and have matching
1820 * profiles, register the common profile for the md device.
1822 if (blk_integrity_register(mddev->gendisk,
1823 bdev_get_integrity(reference->bdev)) != 0) {
1824 printk(KERN_ERR "md: failed to register integrity for %s\n",
1828 printk(KERN_NOTICE "md: data integrity enabled on %s\n", mdname(mddev));
1829 if (bioset_integrity_create(mddev->bio_set, BIO_POOL_SIZE)) {
1830 printk(KERN_ERR "md: failed to create integrity pool for %s\n",
1836 EXPORT_SYMBOL(md_integrity_register);
1838 /* Disable data integrity if non-capable/non-matching disk is being added */
1839 void md_integrity_add_rdev(mdk_rdev_t *rdev, mddev_t *mddev)
1841 struct blk_integrity *bi_rdev = bdev_get_integrity(rdev->bdev);
1842 struct blk_integrity *bi_mddev = blk_get_integrity(mddev->gendisk);
1844 if (!bi_mddev) /* nothing to do */
1846 if (rdev->raid_disk < 0) /* skip spares */
1848 if (bi_rdev && blk_integrity_compare(mddev->gendisk,
1849 rdev->bdev->bd_disk) >= 0)
1851 printk(KERN_NOTICE "disabling data integrity on %s\n", mdname(mddev));
1852 blk_integrity_unregister(mddev->gendisk);
1854 EXPORT_SYMBOL(md_integrity_add_rdev);
1856 static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
1858 char b[BDEVNAME_SIZE];
1868 /* prevent duplicates */
1869 if (find_rdev(mddev, rdev->bdev->bd_dev))
1872 /* make sure rdev->sectors exceeds mddev->dev_sectors */
1873 if (rdev->sectors && (mddev->dev_sectors == 0 ||
1874 rdev->sectors < mddev->dev_sectors)) {
1876 /* Cannot change size, so fail
1877 * If mddev->level <= 0, then we don't care
1878 * about aligning sizes (e.g. linear)
1880 if (mddev->level > 0)
1883 mddev->dev_sectors = rdev->sectors;
1886 /* Verify rdev->desc_nr is unique.
1887 * If it is -1, assign a free number, else
1888 * check number is not in use
1890 if (rdev->desc_nr < 0) {
1892 if (mddev->pers) choice = mddev->raid_disks;
1893 while (find_rdev_nr(mddev, choice))
1895 rdev->desc_nr = choice;
1897 if (find_rdev_nr(mddev, rdev->desc_nr))
1900 if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) {
1901 printk(KERN_WARNING "md: %s: array is limited to %d devices\n",
1902 mdname(mddev), mddev->max_disks);
1905 bdevname(rdev->bdev,b);
1906 while ( (s=strchr(b, '/')) != NULL)
1909 rdev->mddev = mddev;
1910 printk(KERN_INFO "md: bind<%s>\n", b);
1912 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
1915 ko = &part_to_dev(rdev->bdev->bd_part)->kobj;
1916 if (sysfs_create_link(&rdev->kobj, ko, "block"))
1917 /* failure here is OK */;
1918 rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state");
1920 list_add_rcu(&rdev->same_set, &mddev->disks);
1921 bd_link_disk_holder(rdev->bdev, mddev->gendisk);
1923 /* May as well allow recovery to be retried once */
1924 mddev->recovery_disabled++;
1929 printk(KERN_WARNING "md: failed to register dev-%s for %s\n",
1934 static void md_delayed_delete(struct work_struct *ws)
1936 mdk_rdev_t *rdev = container_of(ws, mdk_rdev_t, del_work);
1937 kobject_del(&rdev->kobj);
1938 kobject_put(&rdev->kobj);
1941 static void unbind_rdev_from_array(mdk_rdev_t * rdev)
1943 char b[BDEVNAME_SIZE];
1948 bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk);
1949 list_del_rcu(&rdev->same_set);
1950 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
1952 sysfs_remove_link(&rdev->kobj, "block");
1953 sysfs_put(rdev->sysfs_state);
1954 rdev->sysfs_state = NULL;
1955 /* We need to delay this, otherwise we can deadlock when
1956 * writing to 'remove' to "dev/state". We also need
1957 * to delay it due to rcu usage.
1960 INIT_WORK(&rdev->del_work, md_delayed_delete);
1961 kobject_get(&rdev->kobj);
1962 queue_work(md_misc_wq, &rdev->del_work);
1966 * prevent the device from being mounted, repartitioned or
1967 * otherwise reused by a RAID array (or any other kernel
1968 * subsystem), by bd_claiming the device.
1970 static int lock_rdev(mdk_rdev_t *rdev, dev_t dev, int shared)
1973 struct block_device *bdev;
1974 char b[BDEVNAME_SIZE];
1976 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
1977 shared ? (mdk_rdev_t *)lock_rdev : rdev);
1979 printk(KERN_ERR "md: could not open %s.\n",
1980 __bdevname(dev, b));
1981 return PTR_ERR(bdev);
1987 static void unlock_rdev(mdk_rdev_t *rdev)
1989 struct block_device *bdev = rdev->bdev;
1993 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
1996 void md_autodetect_dev(dev_t dev);
1998 static void export_rdev(mdk_rdev_t * rdev)
2000 char b[BDEVNAME_SIZE];
2001 printk(KERN_INFO "md: export_rdev(%s)\n",
2002 bdevname(rdev->bdev,b));
2007 if (test_bit(AutoDetected, &rdev->flags))
2008 md_autodetect_dev(rdev->bdev->bd_dev);
2011 kobject_put(&rdev->kobj);
2014 static void kick_rdev_from_array(mdk_rdev_t * rdev)
2016 unbind_rdev_from_array(rdev);
2020 static void export_array(mddev_t *mddev)
2022 mdk_rdev_t *rdev, *tmp;
2024 rdev_for_each(rdev, tmp, mddev) {
2029 kick_rdev_from_array(rdev);
2031 if (!list_empty(&mddev->disks))
2033 mddev->raid_disks = 0;
2034 mddev->major_version = 0;
2037 static void print_desc(mdp_disk_t *desc)
2039 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
2040 desc->major,desc->minor,desc->raid_disk,desc->state);
2043 static void print_sb_90(mdp_super_t *sb)
2048 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
2049 sb->major_version, sb->minor_version, sb->patch_version,
2050 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
2052 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
2053 sb->level, sb->size, sb->nr_disks, sb->raid_disks,
2054 sb->md_minor, sb->layout, sb->chunk_size);
2055 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
2056 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
2057 sb->utime, sb->state, sb->active_disks, sb->working_disks,
2058 sb->failed_disks, sb->spare_disks,
2059 sb->sb_csum, (unsigned long)sb->events_lo);
2062 for (i = 0; i < MD_SB_DISKS; i++) {
2065 desc = sb->disks + i;
2066 if (desc->number || desc->major || desc->minor ||
2067 desc->raid_disk || (desc->state && (desc->state != 4))) {
2068 printk(" D %2d: ", i);
2072 printk(KERN_INFO "md: THIS: ");
2073 print_desc(&sb->this_disk);
2076 static void print_sb_1(struct mdp_superblock_1 *sb)
2080 uuid = sb->set_uuid;
2082 "md: SB: (V:%u) (F:0x%08x) Array-ID:<%pU>\n"
2083 "md: Name: \"%s\" CT:%llu\n",
2084 le32_to_cpu(sb->major_version),
2085 le32_to_cpu(sb->feature_map),
2088 (unsigned long long)le64_to_cpu(sb->ctime)
2089 & MD_SUPERBLOCK_1_TIME_SEC_MASK);
2091 uuid = sb->device_uuid;
2093 "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu"
2095 "md: Dev:%08x UUID: %pU\n"
2096 "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n"
2097 "md: (MaxDev:%u) \n",
2098 le32_to_cpu(sb->level),
2099 (unsigned long long)le64_to_cpu(sb->size),
2100 le32_to_cpu(sb->raid_disks),
2101 le32_to_cpu(sb->layout),
2102 le32_to_cpu(sb->chunksize),
2103 (unsigned long long)le64_to_cpu(sb->data_offset),
2104 (unsigned long long)le64_to_cpu(sb->data_size),
2105 (unsigned long long)le64_to_cpu(sb->super_offset),
2106 (unsigned long long)le64_to_cpu(sb->recovery_offset),
2107 le32_to_cpu(sb->dev_number),
2110 (unsigned long long)le64_to_cpu(sb->utime) & MD_SUPERBLOCK_1_TIME_SEC_MASK,
2111 (unsigned long long)le64_to_cpu(sb->events),
2112 (unsigned long long)le64_to_cpu(sb->resync_offset),
2113 le32_to_cpu(sb->sb_csum),
2114 le32_to_cpu(sb->max_dev)
2118 static void print_rdev(mdk_rdev_t *rdev, int major_version)
2120 char b[BDEVNAME_SIZE];
2121 printk(KERN_INFO "md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n",
2122 bdevname(rdev->bdev, b), (unsigned long long)rdev->sectors,
2123 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
2125 if (rdev->sb_loaded) {
2126 printk(KERN_INFO "md: rdev superblock (MJ:%d):\n", major_version);
2127 switch (major_version) {
2129 print_sb_90(page_address(rdev->sb_page));
2132 print_sb_1(page_address(rdev->sb_page));
2136 printk(KERN_INFO "md: no rdev superblock!\n");
2139 static void md_print_devices(void)
2141 struct list_head *tmp;
2144 char b[BDEVNAME_SIZE];
2147 printk("md: **********************************\n");
2148 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
2149 printk("md: **********************************\n");
2150 for_each_mddev(mddev, tmp) {
2153 bitmap_print_sb(mddev->bitmap);
2155 printk("%s: ", mdname(mddev));
2156 list_for_each_entry(rdev, &mddev->disks, same_set)
2157 printk("<%s>", bdevname(rdev->bdev,b));
2160 list_for_each_entry(rdev, &mddev->disks, same_set)
2161 print_rdev(rdev, mddev->major_version);
2163 printk("md: **********************************\n");
2168 static void sync_sbs(mddev_t * mddev, int nospares)
2170 /* Update each superblock (in-memory image), but
2171 * if we are allowed to, skip spares which already
2172 * have the right event counter, or have one earlier
2173 * (which would mean they aren't being marked as dirty
2174 * with the rest of the array)
2177 list_for_each_entry(rdev, &mddev->disks, same_set) {
2178 if (rdev->sb_events == mddev->events ||
2180 rdev->raid_disk < 0 &&
2181 rdev->sb_events+1 == mddev->events)) {
2182 /* Don't update this superblock */
2183 rdev->sb_loaded = 2;
2185 sync_super(mddev, rdev);
2186 rdev->sb_loaded = 1;
2191 static void md_update_sb(mddev_t * mddev, int force_change)
2198 /* First make sure individual recovery_offsets are correct */
2199 list_for_each_entry(rdev, &mddev->disks, same_set) {
2200 if (rdev->raid_disk >= 0 &&
2201 mddev->delta_disks >= 0 &&
2202 !test_bit(In_sync, &rdev->flags) &&
2203 mddev->curr_resync_completed > rdev->recovery_offset)
2204 rdev->recovery_offset = mddev->curr_resync_completed;
2207 if (!mddev->persistent) {
2208 clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
2209 clear_bit(MD_CHANGE_DEVS, &mddev->flags);
2210 if (!mddev->external)
2211 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2212 wake_up(&mddev->sb_wait);
2216 spin_lock_irq(&mddev->write_lock);
2218 mddev->utime = get_seconds();
2220 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
2222 if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags))
2223 /* just a clean<-> dirty transition, possibly leave spares alone,
2224 * though if events isn't the right even/odd, we will have to do
2230 if (mddev->degraded)
2231 /* If the array is degraded, then skipping spares is both
2232 * dangerous and fairly pointless.
2233 * Dangerous because a device that was removed from the array
2234 * might have a event_count that still looks up-to-date,
2235 * so it can be re-added without a resync.
2236 * Pointless because if there are any spares to skip,
2237 * then a recovery will happen and soon that array won't
2238 * be degraded any more and the spare can go back to sleep then.
2242 sync_req = mddev->in_sync;
2244 /* If this is just a dirty<->clean transition, and the array is clean
2245 * and 'events' is odd, we can roll back to the previous clean state */
2247 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
2248 && mddev->can_decrease_events
2249 && mddev->events != 1) {
2251 mddev->can_decrease_events = 0;
2253 /* otherwise we have to go forward and ... */
2255 mddev->can_decrease_events = nospares;
2258 if (!mddev->events) {
2260 * oops, this 64-bit counter should never wrap.
2261 * Either we are in around ~1 trillion A.C., assuming
2262 * 1 reboot per second, or we have a bug:
2267 sync_sbs(mddev, nospares);
2268 spin_unlock_irq(&mddev->write_lock);
2271 "md: updating %s RAID superblock on device (in sync %d)\n",
2272 mdname(mddev),mddev->in_sync);
2274 bitmap_update_sb(mddev->bitmap);
2275 list_for_each_entry(rdev, &mddev->disks, same_set) {
2276 char b[BDEVNAME_SIZE];
2277 dprintk(KERN_INFO "md: ");
2278 if (rdev->sb_loaded != 1)
2279 continue; /* no noise on spare devices */
2280 if (test_bit(Faulty, &rdev->flags))
2281 dprintk("(skipping faulty ");
2283 dprintk("%s ", bdevname(rdev->bdev,b));
2284 if (!test_bit(Faulty, &rdev->flags)) {
2285 md_super_write(mddev,rdev,
2286 rdev->sb_start, rdev->sb_size,
2288 dprintk(KERN_INFO "(write) %s's sb offset: %llu\n",
2289 bdevname(rdev->bdev,b),
2290 (unsigned long long)rdev->sb_start);
2291 rdev->sb_events = mddev->events;
2295 if (mddev->level == LEVEL_MULTIPATH)
2296 /* only need to write one superblock... */
2299 md_super_wait(mddev);
2300 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2302 spin_lock_irq(&mddev->write_lock);
2303 if (mddev->in_sync != sync_req ||
2304 test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
2305 /* have to write it out again */
2306 spin_unlock_irq(&mddev->write_lock);
2309 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2310 spin_unlock_irq(&mddev->write_lock);
2311 wake_up(&mddev->sb_wait);
2312 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
2313 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
2317 /* words written to sysfs files may, or may not, be \n terminated.
2318 * We want to accept with case. For this we use cmd_match.
2320 static int cmd_match(const char *cmd, const char *str)
2322 /* See if cmd, written into a sysfs file, matches
2323 * str. They must either be the same, or cmd can
2324 * have a trailing newline
2326 while (*cmd && *str && *cmd == *str) {
2337 struct rdev_sysfs_entry {
2338 struct attribute attr;
2339 ssize_t (*show)(mdk_rdev_t *, char *);
2340 ssize_t (*store)(mdk_rdev_t *, const char *, size_t);
2344 state_show(mdk_rdev_t *rdev, char *page)
2349 if (test_bit(Faulty, &rdev->flags)) {
2350 len+= sprintf(page+len, "%sfaulty",sep);
2353 if (test_bit(In_sync, &rdev->flags)) {
2354 len += sprintf(page+len, "%sin_sync",sep);
2357 if (test_bit(WriteMostly, &rdev->flags)) {
2358 len += sprintf(page+len, "%swrite_mostly",sep);
2361 if (test_bit(Blocked, &rdev->flags)) {
2362 len += sprintf(page+len, "%sblocked", sep);
2365 if (!test_bit(Faulty, &rdev->flags) &&
2366 !test_bit(In_sync, &rdev->flags)) {
2367 len += sprintf(page+len, "%sspare", sep);
2370 return len+sprintf(page+len, "\n");
2374 state_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2377 * faulty - simulates and error
2378 * remove - disconnects the device
2379 * writemostly - sets write_mostly
2380 * -writemostly - clears write_mostly
2381 * blocked - sets the Blocked flag
2382 * -blocked - clears the Blocked flag
2383 * insync - sets Insync providing device isn't active
2386 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
2387 md_error(rdev->mddev, rdev);
2389 } else if (cmd_match(buf, "remove")) {
2390 if (rdev->raid_disk >= 0)
2393 mddev_t *mddev = rdev->mddev;
2394 kick_rdev_from_array(rdev);
2396 md_update_sb(mddev, 1);
2397 md_new_event(mddev);
2400 } else if (cmd_match(buf, "writemostly")) {
2401 set_bit(WriteMostly, &rdev->flags);
2403 } else if (cmd_match(buf, "-writemostly")) {
2404 clear_bit(WriteMostly, &rdev->flags);
2406 } else if (cmd_match(buf, "blocked")) {
2407 set_bit(Blocked, &rdev->flags);
2409 } else if (cmd_match(buf, "-blocked")) {
2410 clear_bit(Blocked, &rdev->flags);
2411 wake_up(&rdev->blocked_wait);
2412 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2413 md_wakeup_thread(rdev->mddev->thread);
2416 } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) {
2417 set_bit(In_sync, &rdev->flags);
2421 sysfs_notify_dirent_safe(rdev->sysfs_state);
2422 return err ? err : len;
2424 static struct rdev_sysfs_entry rdev_state =
2425 __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store);
2428 errors_show(mdk_rdev_t *rdev, char *page)
2430 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
2434 errors_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2437 unsigned long n = simple_strtoul(buf, &e, 10);
2438 if (*buf && (*e == 0 || *e == '\n')) {
2439 atomic_set(&rdev->corrected_errors, n);
2444 static struct rdev_sysfs_entry rdev_errors =
2445 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
2448 slot_show(mdk_rdev_t *rdev, char *page)
2450 if (rdev->raid_disk < 0)
2451 return sprintf(page, "none\n");
2453 return sprintf(page, "%d\n", rdev->raid_disk);
2457 slot_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2461 int slot = simple_strtoul(buf, &e, 10);
2462 if (strncmp(buf, "none", 4)==0)
2464 else if (e==buf || (*e && *e!= '\n'))
2466 if (rdev->mddev->pers && slot == -1) {
2467 /* Setting 'slot' on an active array requires also
2468 * updating the 'rd%d' link, and communicating
2469 * with the personality with ->hot_*_disk.
2470 * For now we only support removing
2471 * failed/spare devices. This normally happens automatically,
2472 * but not when the metadata is externally managed.
2474 if (rdev->raid_disk == -1)
2476 /* personality does all needed checks */
2477 if (rdev->mddev->pers->hot_remove_disk == NULL)
2479 err = rdev->mddev->pers->
2480 hot_remove_disk(rdev->mddev, rdev->raid_disk);
2483 sysfs_unlink_rdev(rdev->mddev, rdev);
2484 rdev->raid_disk = -1;
2485 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2486 md_wakeup_thread(rdev->mddev->thread);
2487 } else if (rdev->mddev->pers) {
2489 /* Activating a spare .. or possibly reactivating
2490 * if we ever get bitmaps working here.
2493 if (rdev->raid_disk != -1)
2496 if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery))
2499 if (rdev->mddev->pers->hot_add_disk == NULL)
2502 list_for_each_entry(rdev2, &rdev->mddev->disks, same_set)
2503 if (rdev2->raid_disk == slot)
2506 if (slot >= rdev->mddev->raid_disks &&
2507 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
2510 rdev->raid_disk = slot;
2511 if (test_bit(In_sync, &rdev->flags))
2512 rdev->saved_raid_disk = slot;
2514 rdev->saved_raid_disk = -1;
2515 err = rdev->mddev->pers->
2516 hot_add_disk(rdev->mddev, rdev);
2518 rdev->raid_disk = -1;
2521 sysfs_notify_dirent_safe(rdev->sysfs_state);
2522 if (sysfs_link_rdev(rdev->mddev, rdev))
2523 /* failure here is OK */;
2524 /* don't wakeup anyone, leave that to userspace. */
2526 if (slot >= rdev->mddev->raid_disks &&
2527 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
2529 rdev->raid_disk = slot;
2530 /* assume it is working */
2531 clear_bit(Faulty, &rdev->flags);
2532 clear_bit(WriteMostly, &rdev->flags);
2533 set_bit(In_sync, &rdev->flags);
2534 sysfs_notify_dirent_safe(rdev->sysfs_state);
2540 static struct rdev_sysfs_entry rdev_slot =
2541 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
2544 offset_show(mdk_rdev_t *rdev, char *page)
2546 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
2550 offset_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2553 unsigned long long offset = simple_strtoull(buf, &e, 10);
2554 if (e==buf || (*e && *e != '\n'))
2556 if (rdev->mddev->pers && rdev->raid_disk >= 0)
2558 if (rdev->sectors && rdev->mddev->external)
2559 /* Must set offset before size, so overlap checks
2562 rdev->data_offset = offset;
2566 static struct rdev_sysfs_entry rdev_offset =
2567 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
2570 rdev_size_show(mdk_rdev_t *rdev, char *page)
2572 return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2);
2575 static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
2577 /* check if two start/length pairs overlap */
2585 static int strict_blocks_to_sectors(const char *buf, sector_t *sectors)
2587 unsigned long long blocks;
2590 if (strict_strtoull(buf, 10, &blocks) < 0)
2593 if (blocks & 1ULL << (8 * sizeof(blocks) - 1))
2594 return -EINVAL; /* sector conversion overflow */
2597 if (new != blocks * 2)
2598 return -EINVAL; /* unsigned long long to sector_t overflow */
2605 rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2607 mddev_t *my_mddev = rdev->mddev;
2608 sector_t oldsectors = rdev->sectors;
2611 if (strict_blocks_to_sectors(buf, §ors) < 0)
2613 if (my_mddev->pers && rdev->raid_disk >= 0) {
2614 if (my_mddev->persistent) {
2615 sectors = super_types[my_mddev->major_version].
2616 rdev_size_change(rdev, sectors);
2619 } else if (!sectors)
2620 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) -
2623 if (sectors < my_mddev->dev_sectors)
2624 return -EINVAL; /* component must fit device */
2626 rdev->sectors = sectors;
2627 if (sectors > oldsectors && my_mddev->external) {
2628 /* need to check that all other rdevs with the same ->bdev
2629 * do not overlap. We need to unlock the mddev to avoid
2630 * a deadlock. We have already changed rdev->sectors, and if
2631 * we have to change it back, we will have the lock again.
2635 struct list_head *tmp;
2637 mddev_unlock(my_mddev);
2638 for_each_mddev(mddev, tmp) {
2642 list_for_each_entry(rdev2, &mddev->disks, same_set)
2643 if (rdev->bdev == rdev2->bdev &&
2645 overlaps(rdev->data_offset, rdev->sectors,
2651 mddev_unlock(mddev);
2657 mddev_lock(my_mddev);
2659 /* Someone else could have slipped in a size
2660 * change here, but doing so is just silly.
2661 * We put oldsectors back because we *know* it is
2662 * safe, and trust userspace not to race with
2665 rdev->sectors = oldsectors;
2672 static struct rdev_sysfs_entry rdev_size =
2673 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
2676 static ssize_t recovery_start_show(mdk_rdev_t *rdev, char *page)
2678 unsigned long long recovery_start = rdev->recovery_offset;
2680 if (test_bit(In_sync, &rdev->flags) ||
2681 recovery_start == MaxSector)
2682 return sprintf(page, "none\n");
2684 return sprintf(page, "%llu\n", recovery_start);
2687 static ssize_t recovery_start_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2689 unsigned long long recovery_start;
2691 if (cmd_match(buf, "none"))
2692 recovery_start = MaxSector;
2693 else if (strict_strtoull(buf, 10, &recovery_start))
2696 if (rdev->mddev->pers &&
2697 rdev->raid_disk >= 0)
2700 rdev->recovery_offset = recovery_start;
2701 if (recovery_start == MaxSector)
2702 set_bit(In_sync, &rdev->flags);
2704 clear_bit(In_sync, &rdev->flags);
2708 static struct rdev_sysfs_entry rdev_recovery_start =
2709 __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store);
2711 static struct attribute *rdev_default_attrs[] = {
2717 &rdev_recovery_start.attr,
2721 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
2723 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2724 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
2725 mddev_t *mddev = rdev->mddev;
2731 rv = mddev ? mddev_lock(mddev) : -EBUSY;
2733 if (rdev->mddev == NULL)
2736 rv = entry->show(rdev, page);
2737 mddev_unlock(mddev);
2743 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
2744 const char *page, size_t length)
2746 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2747 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
2749 mddev_t *mddev = rdev->mddev;
2753 if (!capable(CAP_SYS_ADMIN))
2755 rv = mddev ? mddev_lock(mddev): -EBUSY;
2757 if (rdev->mddev == NULL)
2760 rv = entry->store(rdev, page, length);
2761 mddev_unlock(mddev);
2766 static void rdev_free(struct kobject *ko)
2768 mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj);
2771 static const struct sysfs_ops rdev_sysfs_ops = {
2772 .show = rdev_attr_show,
2773 .store = rdev_attr_store,
2775 static struct kobj_type rdev_ktype = {
2776 .release = rdev_free,
2777 .sysfs_ops = &rdev_sysfs_ops,
2778 .default_attrs = rdev_default_attrs,
2781 void md_rdev_init(mdk_rdev_t *rdev)
2784 rdev->saved_raid_disk = -1;
2785 rdev->raid_disk = -1;
2787 rdev->data_offset = 0;
2788 rdev->sb_events = 0;
2789 rdev->last_read_error.tv_sec = 0;
2790 rdev->last_read_error.tv_nsec = 0;
2791 atomic_set(&rdev->nr_pending, 0);
2792 atomic_set(&rdev->read_errors, 0);
2793 atomic_set(&rdev->corrected_errors, 0);
2795 INIT_LIST_HEAD(&rdev->same_set);
2796 init_waitqueue_head(&rdev->blocked_wait);
2798 EXPORT_SYMBOL_GPL(md_rdev_init);
2800 * Import a device. If 'super_format' >= 0, then sanity check the superblock
2802 * mark the device faulty if:
2804 * - the device is nonexistent (zero size)
2805 * - the device has no valid superblock
2807 * a faulty rdev _never_ has rdev->sb set.
2809 static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor)
2811 char b[BDEVNAME_SIZE];
2816 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
2818 printk(KERN_ERR "md: could not alloc mem for new device!\n");
2819 return ERR_PTR(-ENOMEM);
2823 if ((err = alloc_disk_sb(rdev)))
2826 err = lock_rdev(rdev, newdev, super_format == -2);
2830 kobject_init(&rdev->kobj, &rdev_ktype);
2832 size = i_size_read(rdev->bdev->bd_inode) >> BLOCK_SIZE_BITS;
2835 "md: %s has zero or unknown size, marking faulty!\n",
2836 bdevname(rdev->bdev,b));
2841 if (super_format >= 0) {
2842 err = super_types[super_format].
2843 load_super(rdev, NULL, super_minor);
2844 if (err == -EINVAL) {
2846 "md: %s does not have a valid v%d.%d "
2847 "superblock, not importing!\n",
2848 bdevname(rdev->bdev,b),
2849 super_format, super_minor);
2854 "md: could not read %s's sb, not importing!\n",
2855 bdevname(rdev->bdev,b));
2863 if (rdev->sb_page) {
2869 return ERR_PTR(err);
2873 * Check a full RAID array for plausibility
2877 static void analyze_sbs(mddev_t * mddev)
2880 mdk_rdev_t *rdev, *freshest, *tmp;
2881 char b[BDEVNAME_SIZE];
2884 rdev_for_each(rdev, tmp, mddev)
2885 switch (super_types[mddev->major_version].
2886 load_super(rdev, freshest, mddev->minor_version)) {
2894 "md: fatal superblock inconsistency in %s"
2895 " -- removing from array\n",
2896 bdevname(rdev->bdev,b));
2897 kick_rdev_from_array(rdev);
2901 super_types[mddev->major_version].
2902 validate_super(mddev, freshest);
2905 rdev_for_each(rdev, tmp, mddev) {
2906 if (mddev->max_disks &&
2907 (rdev->desc_nr >= mddev->max_disks ||
2908 i > mddev->max_disks)) {
2910 "md: %s: %s: only %d devices permitted\n",
2911 mdname(mddev), bdevname(rdev->bdev, b),
2913 kick_rdev_from_array(rdev);
2916 if (rdev != freshest)
2917 if (super_types[mddev->major_version].
2918 validate_super(mddev, rdev)) {
2919 printk(KERN_WARNING "md: kicking non-fresh %s"
2921 bdevname(rdev->bdev,b));
2922 kick_rdev_from_array(rdev);
2925 if (mddev->level == LEVEL_MULTIPATH) {
2926 rdev->desc_nr = i++;
2927 rdev->raid_disk = rdev->desc_nr;
2928 set_bit(In_sync, &rdev->flags);
2929 } else if (rdev->raid_disk >= (mddev->raid_disks - min(0, mddev->delta_disks))) {
2930 rdev->raid_disk = -1;
2931 clear_bit(In_sync, &rdev->flags);
2936 /* Read a fixed-point number.
2937 * Numbers in sysfs attributes should be in "standard" units where
2938 * possible, so time should be in seconds.
2939 * However we internally use a a much smaller unit such as
2940 * milliseconds or jiffies.
2941 * This function takes a decimal number with a possible fractional
2942 * component, and produces an integer which is the result of
2943 * multiplying that number by 10^'scale'.
2944 * all without any floating-point arithmetic.
2946 int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale)
2948 unsigned long result = 0;
2950 while (isdigit(*cp) || (*cp == '.' && decimals < 0)) {
2953 else if (decimals < scale) {
2956 result = result * 10 + value;
2968 while (decimals < scale) {
2977 static void md_safemode_timeout(unsigned long data);
2980 safe_delay_show(mddev_t *mddev, char *page)
2982 int msec = (mddev->safemode_delay*1000)/HZ;
2983 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
2986 safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len)
2990 if (strict_strtoul_scaled(cbuf, &msec, 3) < 0)
2993 mddev->safemode_delay = 0;
2995 unsigned long old_delay = mddev->safemode_delay;
2996 mddev->safemode_delay = (msec*HZ)/1000;
2997 if (mddev->safemode_delay == 0)
2998 mddev->safemode_delay = 1;
2999 if (mddev->safemode_delay < old_delay)
3000 md_safemode_timeout((unsigned long)mddev);
3004 static struct md_sysfs_entry md_safe_delay =
3005 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
3008 level_show(mddev_t *mddev, char *page)
3010 struct mdk_personality *p = mddev->pers;
3012 return sprintf(page, "%s\n", p->name);
3013 else if (mddev->clevel[0])
3014 return sprintf(page, "%s\n", mddev->clevel);
3015 else if (mddev->level != LEVEL_NONE)
3016 return sprintf(page, "%d\n", mddev->level);
3022 level_store(mddev_t *mddev, const char *buf, size_t len)
3026 struct mdk_personality *pers;
3031 if (mddev->pers == NULL) {
3034 if (len >= sizeof(mddev->clevel))
3036 strncpy(mddev->clevel, buf, len);
3037 if (mddev->clevel[len-1] == '\n')
3039 mddev->clevel[len] = 0;
3040 mddev->level = LEVEL_NONE;
3044 /* request to change the personality. Need to ensure:
3045 * - array is not engaged in resync/recovery/reshape
3046 * - old personality can be suspended
3047 * - new personality will access other array.
3050 if (mddev->sync_thread ||
3051 mddev->reshape_position != MaxSector ||
3052 mddev->sysfs_active)
3055 if (!mddev->pers->quiesce) {
3056 printk(KERN_WARNING "md: %s: %s does not support online personality change\n",
3057 mdname(mddev), mddev->pers->name);
3061 /* Now find the new personality */
3062 if (len == 0 || len >= sizeof(clevel))
3064 strncpy(clevel, buf, len);
3065 if (clevel[len-1] == '\n')
3068 if (strict_strtol(clevel, 10, &level))
3071 if (request_module("md-%s", clevel) != 0)
3072 request_module("md-level-%s", clevel);
3073 spin_lock(&pers_lock);
3074 pers = find_pers(level, clevel);
3075 if (!pers || !try_module_get(pers->owner)) {
3076 spin_unlock(&pers_lock);
3077 printk(KERN_WARNING "md: personality %s not loaded\n", clevel);
3080 spin_unlock(&pers_lock);
3082 if (pers == mddev->pers) {
3083 /* Nothing to do! */
3084 module_put(pers->owner);
3087 if (!pers->takeover) {
3088 module_put(pers->owner);
3089 printk(KERN_WARNING "md: %s: %s does not support personality takeover\n",
3090 mdname(mddev), clevel);
3094 list_for_each_entry(rdev, &mddev->disks, same_set)
3095 rdev->new_raid_disk = rdev->raid_disk;
3097 /* ->takeover must set new_* and/or delta_disks
3098 * if it succeeds, and may set them when it fails.
3100 priv = pers->takeover(mddev);
3102 mddev->new_level = mddev->level;
3103 mddev->new_layout = mddev->layout;
3104 mddev->new_chunk_sectors = mddev->chunk_sectors;
3105 mddev->raid_disks -= mddev->delta_disks;
3106 mddev->delta_disks = 0;
3107 module_put(pers->owner);
3108 printk(KERN_WARNING "md: %s: %s would not accept array\n",
3109 mdname(mddev), clevel);
3110 return PTR_ERR(priv);
3113 /* Looks like we have a winner */
3114 mddev_suspend(mddev);
3115 mddev->pers->stop(mddev);
3117 if (mddev->pers->sync_request == NULL &&
3118 pers->sync_request != NULL) {
3119 /* need to add the md_redundancy_group */
3120 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
3122 "md: cannot register extra attributes for %s\n",
3124 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, NULL, "sync_action");
3126 if (mddev->pers->sync_request != NULL &&
3127 pers->sync_request == NULL) {
3128 /* need to remove the md_redundancy_group */
3129 if (mddev->to_remove == NULL)
3130 mddev->to_remove = &md_redundancy_group;
3133 if (mddev->pers->sync_request == NULL &&
3135 /* We are converting from a no-redundancy array
3136 * to a redundancy array and metadata is managed
3137 * externally so we need to be sure that writes
3138 * won't block due to a need to transition
3140 * until external management is started.
3143 mddev->safemode_delay = 0;
3144 mddev->safemode = 0;
3147 list_for_each_entry(rdev, &mddev->disks, same_set) {
3148 if (rdev->raid_disk < 0)
3150 if (rdev->new_raid_disk >= mddev->raid_disks)
3151 rdev->new_raid_disk = -1;
3152 if (rdev->new_raid_disk == rdev->raid_disk)
3154 sysfs_unlink_rdev(mddev, rdev);
3156 list_for_each_entry(rdev, &mddev->disks, same_set) {
3157 if (rdev->raid_disk < 0)
3159 if (rdev->new_raid_disk == rdev->raid_disk)
3161 rdev->raid_disk = rdev->new_raid_disk;
3162 if (rdev->raid_disk < 0)
3163 clear_bit(In_sync, &rdev->flags);
3165 if (sysfs_link_rdev(mddev, rdev))
3166 printk(KERN_WARNING "md: cannot register rd%d"
3167 " for %s after level change\n",
3168 rdev->raid_disk, mdname(mddev));
3172 module_put(mddev->pers->owner);
3174 mddev->private = priv;
3175 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
3176 mddev->level = mddev->new_level;
3177 mddev->layout = mddev->new_layout;
3178 mddev->chunk_sectors = mddev->new_chunk_sectors;
3179 mddev->delta_disks = 0;
3180 mddev->degraded = 0;
3181 if (mddev->pers->sync_request == NULL) {
3182 /* this is now an array without redundancy, so
3183 * it must always be in_sync
3186 del_timer_sync(&mddev->safemode_timer);
3189 mddev_resume(mddev);
3190 set_bit(MD_CHANGE_DEVS, &mddev->flags);
3191 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3192 md_wakeup_thread(mddev->thread);
3193 sysfs_notify(&mddev->kobj, NULL, "level");
3194 md_new_event(mddev);
3198 static struct md_sysfs_entry md_level =
3199 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
3203 layout_show(mddev_t *mddev, char *page)
3205 /* just a number, not meaningful for all levels */
3206 if (mddev->reshape_position != MaxSector &&
3207 mddev->layout != mddev->new_layout)
3208 return sprintf(page, "%d (%d)\n",
3209 mddev->new_layout, mddev->layout);
3210 return sprintf(page, "%d\n", mddev->layout);
3214 layout_store(mddev_t *mddev, const char *buf, size_t len)
3217 unsigned long n = simple_strtoul(buf, &e, 10);
3219 if (!*buf || (*e && *e != '\n'))
3224 if (mddev->pers->check_reshape == NULL)
3226 mddev->new_layout = n;
3227 err = mddev->pers->check_reshape(mddev);
3229 mddev->new_layout = mddev->layout;
3233 mddev->new_layout = n;
3234 if (mddev->reshape_position == MaxSector)
3239 static struct md_sysfs_entry md_layout =
3240 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
3244 raid_disks_show(mddev_t *mddev, char *page)
3246 if (mddev->raid_disks == 0)
3248 if (mddev->reshape_position != MaxSector &&
3249 mddev->delta_disks != 0)
3250 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
3251 mddev->raid_disks - mddev->delta_disks);
3252 return sprintf(page, "%d\n", mddev->raid_disks);
3255 static int update_raid_disks(mddev_t *mddev, int raid_disks);
3258 raid_disks_store(mddev_t *mddev, const char *buf, size_t len)
3262 unsigned long n = simple_strtoul(buf, &e, 10);
3264 if (!*buf || (*e && *e != '\n'))
3268 rv = update_raid_disks(mddev, n);
3269 else if (mddev->reshape_position != MaxSector) {
3270 int olddisks = mddev->raid_disks - mddev->delta_disks;
3271 mddev->delta_disks = n - olddisks;
3272 mddev->raid_disks = n;
3274 mddev->raid_disks = n;
3275 return rv ? rv : len;
3277 static struct md_sysfs_entry md_raid_disks =
3278 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
3281 chunk_size_show(mddev_t *mddev, char *page)
3283 if (mddev->reshape_position != MaxSector &&
3284 mddev->chunk_sectors != mddev->new_chunk_sectors)
3285 return sprintf(page, "%d (%d)\n",
3286 mddev->new_chunk_sectors << 9,
3287 mddev->chunk_sectors << 9);
3288 return sprintf(page, "%d\n", mddev->chunk_sectors << 9);
3292 chunk_size_store(mddev_t *mddev, const char *buf, size_t len)
3295 unsigned long n = simple_strtoul(buf, &e, 10);
3297 if (!*buf || (*e && *e != '\n'))
3302 if (mddev->pers->check_reshape == NULL)
3304 mddev->new_chunk_sectors = n >> 9;
3305 err = mddev->pers->check_reshape(mddev);
3307 mddev->new_chunk_sectors = mddev->chunk_sectors;
3311 mddev->new_chunk_sectors = n >> 9;
3312 if (mddev->reshape_position == MaxSector)
3313 mddev->chunk_sectors = n >> 9;
3317 static struct md_sysfs_entry md_chunk_size =
3318 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
3321 resync_start_show(mddev_t *mddev, char *page)
3323 if (mddev->recovery_cp == MaxSector)
3324 return sprintf(page, "none\n");
3325 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
3329 resync_start_store(mddev_t *mddev, const char *buf, size_t len)
3332 unsigned long long n = simple_strtoull(buf, &e, 10);
3334 if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
3336 if (cmd_match(buf, "none"))
3338 else if (!*buf || (*e && *e != '\n'))
3341 mddev->recovery_cp = n;
3344 static struct md_sysfs_entry md_resync_start =
3345 __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store);
3348 * The array state can be:
3351 * No devices, no size, no level
3352 * Equivalent to STOP_ARRAY ioctl
3354 * May have some settings, but array is not active
3355 * all IO results in error
3356 * When written, doesn't tear down array, but just stops it
3357 * suspended (not supported yet)
3358 * All IO requests will block. The array can be reconfigured.
3359 * Writing this, if accepted, will block until array is quiescent
3361 * no resync can happen. no superblocks get written.
3362 * write requests fail
3364 * like readonly, but behaves like 'clean' on a write request.
3366 * clean - no pending writes, but otherwise active.
3367 * When written to inactive array, starts without resync
3368 * If a write request arrives then
3369 * if metadata is known, mark 'dirty' and switch to 'active'.
3370 * if not known, block and switch to write-pending
3371 * If written to an active array that has pending writes, then fails.
3373 * fully active: IO and resync can be happening.
3374 * When written to inactive array, starts with resync
3377 * clean, but writes are blocked waiting for 'active' to be written.
3380 * like active, but no writes have been seen for a while (100msec).
3383 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
3384 write_pending, active_idle, bad_word};
3385 static char *array_states[] = {
3386 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3387 "write-pending", "active-idle", NULL };
3389 static int match_word(const char *word, char **list)
3392 for (n=0; list[n]; n++)
3393 if (cmd_match(word, list[n]))
3399 array_state_show(mddev_t *mddev, char *page)
3401 enum array_state st = inactive;
3414 else if (test_bit(MD_CHANGE_PENDING, &mddev->flags))
3416 else if (mddev->safemode)
3422 if (list_empty(&mddev->disks) &&
3423 mddev->raid_disks == 0 &&
3424 mddev->dev_sectors == 0)
3429 return sprintf(page, "%s\n", array_states[st]);
3432 static int do_md_stop(mddev_t * mddev, int ro, int is_open);
3433 static int md_set_readonly(mddev_t * mddev, int is_open);
3434 static int do_md_run(mddev_t * mddev);
3435 static int restart_array(mddev_t *mddev);
3438 array_state_store(mddev_t *mddev, const char *buf, size_t len)
3441 enum array_state st = match_word(buf, array_states);
3446 /* stopping an active array */
3447 if (atomic_read(&mddev->openers) > 0)
3449 err = do_md_stop(mddev, 0, 0);
3452 /* stopping an active array */
3454 if (atomic_read(&mddev->openers) > 0)
3456 err = do_md_stop(mddev, 2, 0);
3458 err = 0; /* already inactive */
3461 break; /* not supported yet */
3464 err = md_set_readonly(mddev, 0);
3467 set_disk_ro(mddev->gendisk, 1);
3468 err = do_md_run(mddev);
3474 err = md_set_readonly(mddev, 0);
3475 else if (mddev->ro == 1)
3476 err = restart_array(mddev);
3479 set_disk_ro(mddev->gendisk, 0);
3483 err = do_md_run(mddev);
3488 restart_array(mddev);
3489 spin_lock_irq(&mddev->write_lock);
3490 if (atomic_read(&mddev->writes_pending) == 0) {
3491 if (mddev->in_sync == 0) {
3493 if (mddev->safemode == 1)
3494 mddev->safemode = 0;
3495 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
3500 spin_unlock_irq(&mddev->write_lock);
3506 restart_array(mddev);
3507 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
3508 wake_up(&mddev->sb_wait);
3512 set_disk_ro(mddev->gendisk, 0);
3513 err = do_md_run(mddev);
3518 /* these cannot be set */
3524 sysfs_notify_dirent_safe(mddev->sysfs_state);
3528 static struct md_sysfs_entry md_array_state =
3529 __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
3532 max_corrected_read_errors_show(mddev_t *mddev, char *page) {
3533 return sprintf(page, "%d\n",
3534 atomic_read(&mddev->max_corr_read_errors));
3538 max_corrected_read_errors_store(mddev_t *mddev, const char *buf, size_t len)
3541 unsigned long n = simple_strtoul(buf, &e, 10);
3543 if (*buf && (*e == 0 || *e == '\n')) {
3544 atomic_set(&mddev->max_corr_read_errors, n);
3550 static struct md_sysfs_entry max_corr_read_errors =
3551 __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show,
3552 max_corrected_read_errors_store);
3555 null_show(mddev_t *mddev, char *page)
3561 new_dev_store(mddev_t *mddev, const char *buf, size_t len)
3563 /* buf must be %d:%d\n? giving major and minor numbers */
3564 /* The new device is added to the array.
3565 * If the array has a persistent superblock, we read the
3566 * superblock to initialise info and check validity.
3567 * Otherwise, only checking done is that in bind_rdev_to_array,
3568 * which mainly checks size.
3571 int major = simple_strtoul(buf, &e, 10);
3577 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
3579 minor = simple_strtoul(e+1, &e, 10);
3580 if (*e && *e != '\n')
3582 dev = MKDEV(major, minor);
3583 if (major != MAJOR(dev) ||
3584 minor != MINOR(dev))
3588 if (mddev->persistent) {
3589 rdev = md_import_device(dev, mddev->major_version,
3590 mddev->minor_version);
3591 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
3592 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
3593 mdk_rdev_t, same_set);
3594 err = super_types[mddev->major_version]
3595 .load_super(rdev, rdev0, mddev->minor_version);
3599 } else if (mddev->external)
3600 rdev = md_import_device(dev, -2, -1);
3602 rdev = md_import_device(dev, -1, -1);
3605 return PTR_ERR(rdev);
3606 err = bind_rdev_to_array(rdev, mddev);
3610 return err ? err : len;
3613 static struct md_sysfs_entry md_new_device =
3614 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
3617 bitmap_store(mddev_t *mddev, const char *buf, size_t len)
3620 unsigned long chunk, end_chunk;
3624 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
3626 chunk = end_chunk = simple_strtoul(buf, &end, 0);
3627 if (buf == end) break;
3628 if (*end == '-') { /* range */
3630 end_chunk = simple_strtoul(buf, &end, 0);
3631 if (buf == end) break;
3633 if (*end && !isspace(*end)) break;
3634 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
3635 buf = skip_spaces(end);
3637 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
3642 static struct md_sysfs_entry md_bitmap =
3643 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
3646 size_show(mddev_t *mddev, char *page)
3648 return sprintf(page, "%llu\n",
3649 (unsigned long long)mddev->dev_sectors / 2);
3652 static int update_size(mddev_t *mddev, sector_t num_sectors);
3655 size_store(mddev_t *mddev, const char *buf, size_t len)
3657 /* If array is inactive, we can reduce the component size, but
3658 * not increase it (except from 0).
3659 * If array is active, we can try an on-line resize
3662 int err = strict_blocks_to_sectors(buf, §ors);
3667 err = update_size(mddev, sectors);
3668 md_update_sb(mddev, 1);
3670 if (mddev->dev_sectors == 0 ||
3671 mddev->dev_sectors > sectors)
3672 mddev->dev_sectors = sectors;
3676 return err ? err : len;
3679 static struct md_sysfs_entry md_size =
3680 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
3685 * 'none' for arrays with no metadata (good luck...)
3686 * 'external' for arrays with externally managed metadata,
3687 * or N.M for internally known formats
3690 metadata_show(mddev_t *mddev, char *page)
3692 if (mddev->persistent)
3693 return sprintf(page, "%d.%d\n",
3694 mddev->major_version, mddev->minor_version);
3695 else if (mddev->external)
3696 return sprintf(page, "external:%s\n", mddev->metadata_type);
3698 return sprintf(page, "none\n");
3702 metadata_store(mddev_t *mddev, const char *buf, size_t len)
3706 /* Changing the details of 'external' metadata is
3707 * always permitted. Otherwise there must be
3708 * no devices attached to the array.
3710 if (mddev->external && strncmp(buf, "external:", 9) == 0)
3712 else if (!list_empty(&mddev->disks))
3715 if (cmd_match(buf, "none")) {
3716 mddev->persistent = 0;
3717 mddev->external = 0;
3718 mddev->major_version = 0;
3719 mddev->minor_version = 90;
3722 if (strncmp(buf, "external:", 9) == 0) {
3723 size_t namelen = len-9;
3724 if (namelen >= sizeof(mddev->metadata_type))
3725 namelen = sizeof(mddev->metadata_type)-1;
3726 strncpy(mddev->metadata_type, buf+9, namelen);
3727 mddev->metadata_type[namelen] = 0;
3728 if (namelen && mddev->metadata_type[namelen-1] == '\n')
3729 mddev->metadata_type[--namelen] = 0;
3730 mddev->persistent = 0;
3731 mddev->external = 1;
3732 mddev->major_version = 0;
3733 mddev->minor_version = 90;
3736 major = simple_strtoul(buf, &e, 10);
3737 if (e==buf || *e != '.')
3740 minor = simple_strtoul(buf, &e, 10);
3741 if (e==buf || (*e && *e != '\n') )
3743 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
3745 mddev->major_version = major;
3746 mddev->minor_version = minor;
3747 mddev->persistent = 1;
3748 mddev->external = 0;
3752 static struct md_sysfs_entry md_metadata =
3753 __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
3756 action_show(mddev_t *mddev, char *page)
3758 char *type = "idle";
3759 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
3761 else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3762 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) {
3763 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
3765 else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
3766 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
3768 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
3772 } else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
3775 return sprintf(page, "%s\n", type);
3778 static void reap_sync_thread(mddev_t *mddev);
3781 action_store(mddev_t *mddev, const char *page, size_t len)
3783 if (!mddev->pers || !mddev->pers->sync_request)
3786 if (cmd_match(page, "frozen"))
3787 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3789 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3791 if (cmd_match(page, "idle") || cmd_match(page, "frozen")) {
3792 if (mddev->sync_thread) {
3793 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
3794 reap_sync_thread(mddev);
3796 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3797 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
3799 else if (cmd_match(page, "resync"))
3800 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3801 else if (cmd_match(page, "recover")) {
3802 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
3803 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3804 } else if (cmd_match(page, "reshape")) {
3806 if (mddev->pers->start_reshape == NULL)
3808 err = mddev->pers->start_reshape(mddev);
3811 sysfs_notify(&mddev->kobj, NULL, "degraded");
3813 if (cmd_match(page, "check"))
3814 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
3815 else if (!cmd_match(page, "repair"))
3817 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
3818 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
3820 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3821 md_wakeup_thread(mddev->thread);
3822 sysfs_notify_dirent_safe(mddev->sysfs_action);
3827 mismatch_cnt_show(mddev_t *mddev, char *page)
3829 return sprintf(page, "%llu\n",
3830 (unsigned long long) mddev->resync_mismatches);
3833 static struct md_sysfs_entry md_scan_mode =
3834 __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
3837 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
3840 sync_min_show(mddev_t *mddev, char *page)
3842 return sprintf(page, "%d (%s)\n", speed_min(mddev),
3843 mddev->sync_speed_min ? "local": "system");
3847 sync_min_store(mddev_t *mddev, const char *buf, size_t len)
3851 if (strncmp(buf, "system", 6)==0) {
3852 mddev->sync_speed_min = 0;
3855 min = simple_strtoul(buf, &e, 10);
3856 if (buf == e || (*e && *e != '\n') || min <= 0)
3858 mddev->sync_speed_min = min;
3862 static struct md_sysfs_entry md_sync_min =
3863 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
3866 sync_max_show(mddev_t *mddev, char *page)
3868 return sprintf(page, "%d (%s)\n", speed_max(mddev),
3869 mddev->sync_speed_max ? "local": "system");
3873 sync_max_store(mddev_t *mddev, const char *buf, size_t len)
3877 if (strncmp(buf, "system", 6)==0) {
3878 mddev->sync_speed_max = 0;
3881 max = simple_strtoul(buf, &e, 10);
3882 if (buf == e || (*e && *e != '\n') || max <= 0)
3884 mddev->sync_speed_max = max;
3888 static struct md_sysfs_entry md_sync_max =
3889 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
3892 degraded_show(mddev_t *mddev, char *page)
3894 return sprintf(page, "%d\n", mddev->degraded);
3896 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
3899 sync_force_parallel_show(mddev_t *mddev, char *page)
3901 return sprintf(page, "%d\n", mddev->parallel_resync);
3905 sync_force_parallel_store(mddev_t *mddev, const char *buf, size_t len)
3909 if (strict_strtol(buf, 10, &n))
3912 if (n != 0 && n != 1)
3915 mddev->parallel_resync = n;
3917 if (mddev->sync_thread)
3918 wake_up(&resync_wait);
3923 /* force parallel resync, even with shared block devices */
3924 static struct md_sysfs_entry md_sync_force_parallel =
3925 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
3926 sync_force_parallel_show, sync_force_parallel_store);
3929 sync_speed_show(mddev_t *mddev, char *page)
3931 unsigned long resync, dt, db;
3932 if (mddev->curr_resync == 0)
3933 return sprintf(page, "none\n");
3934 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
3935 dt = (jiffies - mddev->resync_mark) / HZ;
3937 db = resync - mddev->resync_mark_cnt;
3938 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
3941 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
3944 sync_completed_show(mddev_t *mddev, char *page)
3946 unsigned long long max_sectors, resync;
3948 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3949 return sprintf(page, "none\n");
3951 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
3952 max_sectors = mddev->resync_max_sectors;
3954 max_sectors = mddev->dev_sectors;
3956 resync = mddev->curr_resync_completed;
3957 return sprintf(page, "%llu / %llu\n", resync, max_sectors);
3960 static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed);
3963 min_sync_show(mddev_t *mddev, char *page)
3965 return sprintf(page, "%llu\n",
3966 (unsigned long long)mddev->resync_min);
3969 min_sync_store(mddev_t *mddev, const char *buf, size_t len)
3971 unsigned long long min;
3972 if (strict_strtoull(buf, 10, &min))
3974 if (min > mddev->resync_max)
3976 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3979 /* Must be a multiple of chunk_size */
3980 if (mddev->chunk_sectors) {
3981 sector_t temp = min;
3982 if (sector_div(temp, mddev->chunk_sectors))
3985 mddev->resync_min = min;
3990 static struct md_sysfs_entry md_min_sync =
3991 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
3994 max_sync_show(mddev_t *mddev, char *page)
3996 if (mddev->resync_max == MaxSector)
3997 return sprintf(page, "max\n");
3999 return sprintf(page, "%llu\n",
4000 (unsigned long long)mddev->resync_max);
4003 max_sync_store(mddev_t *mddev, const char *buf, size_t len)
4005 if (strncmp(buf, "max", 3) == 0)
4006 mddev->resync_max = MaxSector;
4008 unsigned long long max;
4009 if (strict_strtoull(buf, 10, &max))
4011 if (max < mddev->resync_min)
4013 if (max < mddev->resync_max &&
4015 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4018 /* Must be a multiple of chunk_size */
4019 if (mddev->chunk_sectors) {
4020 sector_t temp = max;
4021 if (sector_div(temp, mddev->chunk_sectors))
4024 mddev->resync_max = max;
4026 wake_up(&mddev->recovery_wait);
4030 static struct md_sysfs_entry md_max_sync =
4031 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
4034 suspend_lo_show(mddev_t *mddev, char *page)
4036 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
4040 suspend_lo_store(mddev_t *mddev, const char *buf, size_t len)
4043 unsigned long long new = simple_strtoull(buf, &e, 10);
4044 unsigned long long old = mddev->suspend_lo;
4046 if (mddev->pers == NULL ||
4047 mddev->pers->quiesce == NULL)
4049 if (buf == e || (*e && *e != '\n'))
4052 mddev->suspend_lo = new;
4054 /* Shrinking suspended region */
4055 mddev->pers->quiesce(mddev, 2);
4057 /* Expanding suspended region - need to wait */
4058 mddev->pers->quiesce(mddev, 1);
4059 mddev->pers->quiesce(mddev, 0);
4063 static struct md_sysfs_entry md_suspend_lo =
4064 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
4068 suspend_hi_show(mddev_t *mddev, char *page)
4070 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
4074 suspend_hi_store(mddev_t *mddev, const char *buf, size_t len)
4077 unsigned long long new = simple_strtoull(buf, &e, 10);
4078 unsigned long long old = mddev->suspend_hi;
4080 if (mddev->pers == NULL ||
4081 mddev->pers->quiesce == NULL)
4083 if (buf == e || (*e && *e != '\n'))
4086 mddev->suspend_hi = new;
4088 /* Shrinking suspended region */
4089 mddev->pers->quiesce(mddev, 2);
4091 /* Expanding suspended region - need to wait */
4092 mddev->pers->quiesce(mddev, 1);
4093 mddev->pers->quiesce(mddev, 0);
4097 static struct md_sysfs_entry md_suspend_hi =
4098 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
4101 reshape_position_show(mddev_t *mddev, char *page)
4103 if (mddev->reshape_position != MaxSector)
4104 return sprintf(page, "%llu\n",
4105 (unsigned long long)mddev->reshape_position);
4106 strcpy(page, "none\n");
4111 reshape_position_store(mddev_t *mddev, const char *buf, size_t len)
4114 unsigned long long new = simple_strtoull(buf, &e, 10);
4117 if (buf == e || (*e && *e != '\n'))
4119 mddev->reshape_position = new;
4120 mddev->delta_disks = 0;
4121 mddev->new_level = mddev->level;
4122 mddev->new_layout = mddev->layout;
4123 mddev->new_chunk_sectors = mddev->chunk_sectors;
4127 static struct md_sysfs_entry md_reshape_position =
4128 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
4129 reshape_position_store);
4132 array_size_show(mddev_t *mddev, char *page)
4134 if (mddev->external_size)
4135 return sprintf(page, "%llu\n",
4136 (unsigned long long)mddev->array_sectors/2);
4138 return sprintf(page, "default\n");
4142 array_size_store(mddev_t *mddev, const char *buf, size_t len)
4146 if (strncmp(buf, "default", 7) == 0) {
4148 sectors = mddev->pers->size(mddev, 0, 0);
4150 sectors = mddev->array_sectors;
4152 mddev->external_size = 0;
4154 if (strict_blocks_to_sectors(buf, §ors) < 0)
4156 if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors)
4159 mddev->external_size = 1;
4162 mddev->array_sectors = sectors;
4164 set_capacity(mddev->gendisk, mddev->array_sectors);
4165 revalidate_disk(mddev->gendisk);
4170 static struct md_sysfs_entry md_array_size =
4171 __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show,
4174 static struct attribute *md_default_attrs[] = {
4177 &md_raid_disks.attr,
4178 &md_chunk_size.attr,
4180 &md_resync_start.attr,
4182 &md_new_device.attr,
4183 &md_safe_delay.attr,
4184 &md_array_state.attr,
4185 &md_reshape_position.attr,
4186 &md_array_size.attr,
4187 &max_corr_read_errors.attr,
4191 static struct attribute *md_redundancy_attrs[] = {
4193 &md_mismatches.attr,
4196 &md_sync_speed.attr,
4197 &md_sync_force_parallel.attr,
4198 &md_sync_completed.attr,
4201 &md_suspend_lo.attr,
4202 &md_suspend_hi.attr,
4207 static struct attribute_group md_redundancy_group = {
4209 .attrs = md_redundancy_attrs,
4214 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
4216 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
4217 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
4222 rv = mddev_lock(mddev);
4224 rv = entry->show(mddev, page);
4225 mddev_unlock(mddev);
4231 md_attr_store(struct kobject *kobj, struct attribute *attr,
4232 const char *page, size_t length)
4234 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
4235 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
4240 if (!capable(CAP_SYS_ADMIN))
4242 rv = mddev_lock(mddev);
4243 if (mddev->hold_active == UNTIL_IOCTL)
4244 mddev->hold_active = 0;
4246 rv = entry->store(mddev, page, length);
4247 mddev_unlock(mddev);
4252 static void md_free(struct kobject *ko)
4254 mddev_t *mddev = container_of(ko, mddev_t, kobj);
4256 if (mddev->sysfs_state)
4257 sysfs_put(mddev->sysfs_state);
4259 if (mddev->gendisk) {
4260 del_gendisk(mddev->gendisk);
4261 put_disk(mddev->gendisk);
4264 blk_cleanup_queue(mddev->queue);
4269 static const struct sysfs_ops md_sysfs_ops = {
4270 .show = md_attr_show,
4271 .store = md_attr_store,
4273 static struct kobj_type md_ktype = {
4275 .sysfs_ops = &md_sysfs_ops,
4276 .default_attrs = md_default_attrs,
4281 static void mddev_delayed_delete(struct work_struct *ws)
4283 mddev_t *mddev = container_of(ws, mddev_t, del_work);
4285 sysfs_remove_group(&mddev->kobj, &md_bitmap_group);
4286 kobject_del(&mddev->kobj);
4287 kobject_put(&mddev->kobj);
4290 static int md_alloc(dev_t dev, char *name)
4292 static DEFINE_MUTEX(disks_mutex);
4293 mddev_t *mddev = mddev_find(dev);
4294 struct gendisk *disk;
4303 partitioned = (MAJOR(mddev->unit) != MD_MAJOR);
4304 shift = partitioned ? MdpMinorShift : 0;
4305 unit = MINOR(mddev->unit) >> shift;
4307 /* wait for any previous instance of this device to be
4308 * completely removed (mddev_delayed_delete).
4310 flush_workqueue(md_misc_wq);
4312 mutex_lock(&disks_mutex);
4318 /* Need to ensure that 'name' is not a duplicate.
4321 spin_lock(&all_mddevs_lock);
4323 list_for_each_entry(mddev2, &all_mddevs, all_mddevs)
4324 if (mddev2->gendisk &&
4325 strcmp(mddev2->gendisk->disk_name, name) == 0) {
4326 spin_unlock(&all_mddevs_lock);
4329 spin_unlock(&all_mddevs_lock);
4333 mddev->queue = blk_alloc_queue(GFP_KERNEL);
4336 mddev->queue->queuedata = mddev;
4338 blk_queue_make_request(mddev->queue, md_make_request);
4340 disk = alloc_disk(1 << shift);
4342 blk_cleanup_queue(mddev->queue);
4343 mddev->queue = NULL;
4346 disk->major = MAJOR(mddev->unit);
4347 disk->first_minor = unit << shift;
4349 strcpy(disk->disk_name, name);
4350 else if (partitioned)
4351 sprintf(disk->disk_name, "md_d%d", unit);
4353 sprintf(disk->disk_name, "md%d", unit);
4354 disk->fops = &md_fops;
4355 disk->private_data = mddev;
4356 disk->queue = mddev->queue;
4357 blk_queue_flush(mddev->queue, REQ_FLUSH | REQ_FUA);
4358 /* Allow extended partitions. This makes the
4359 * 'mdp' device redundant, but we can't really
4362 disk->flags |= GENHD_FL_EXT_DEVT;
4363 mddev->gendisk = disk;
4364 /* As soon as we call add_disk(), another thread could get
4365 * through to md_open, so make sure it doesn't get too far
4367 mutex_lock(&mddev->open_mutex);
4370 error = kobject_init_and_add(&mddev->kobj, &md_ktype,
4371 &disk_to_dev(disk)->kobj, "%s", "md");
4373 /* This isn't possible, but as kobject_init_and_add is marked
4374 * __must_check, we must do something with the result
4376 printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
4380 if (mddev->kobj.sd &&
4381 sysfs_create_group(&mddev->kobj, &md_bitmap_group))
4382 printk(KERN_DEBUG "pointless warning\n");
4383 mutex_unlock(&mddev->open_mutex);
4385 mutex_unlock(&disks_mutex);
4386 if (!error && mddev->kobj.sd) {
4387 kobject_uevent(&mddev->kobj, KOBJ_ADD);
4388 mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state");
4394 static struct kobject *md_probe(dev_t dev, int *part, void *data)
4396 md_alloc(dev, NULL);
4400 static int add_named_array(const char *val, struct kernel_param *kp)
4402 /* val must be "md_*" where * is not all digits.
4403 * We allocate an array with a large free minor number, and
4404 * set the name to val. val must not already be an active name.
4406 int len = strlen(val);
4407 char buf[DISK_NAME_LEN];
4409 while (len && val[len-1] == '\n')
4411 if (len >= DISK_NAME_LEN)
4413 strlcpy(buf, val, len+1);
4414 if (strncmp(buf, "md_", 3) != 0)
4416 return md_alloc(0, buf);
4419 static void md_safemode_timeout(unsigned long data)
4421 mddev_t *mddev = (mddev_t *) data;
4423 if (!atomic_read(&mddev->writes_pending)) {
4424 mddev->safemode = 1;
4425 if (mddev->external)
4426 sysfs_notify_dirent_safe(mddev->sysfs_state);
4428 md_wakeup_thread(mddev->thread);
4431 static int start_dirty_degraded;
4433 int md_run(mddev_t *mddev)
4437 struct mdk_personality *pers;
4439 if (list_empty(&mddev->disks))
4440 /* cannot run an array with no devices.. */
4445 /* Cannot run until previous stop completes properly */
4446 if (mddev->sysfs_active)
4450 * Analyze all RAID superblock(s)
4452 if (!mddev->raid_disks) {
4453 if (!mddev->persistent)
4458 if (mddev->level != LEVEL_NONE)
4459 request_module("md-level-%d", mddev->level);
4460 else if (mddev->clevel[0])
4461 request_module("md-%s", mddev->clevel);
4464 * Drop all container device buffers, from now on
4465 * the only valid external interface is through the md
4468 list_for_each_entry(rdev, &mddev->disks, same_set) {
4469 if (test_bit(Faulty, &rdev->flags))
4471 sync_blockdev(rdev->bdev);
4472 invalidate_bdev(rdev->bdev);
4474 /* perform some consistency tests on the device.
4475 * We don't want the data to overlap the metadata,
4476 * Internal Bitmap issues have been handled elsewhere.
4478 if (rdev->meta_bdev) {
4479 /* Nothing to check */;
4480 } else if (rdev->data_offset < rdev->sb_start) {
4481 if (mddev->dev_sectors &&
4482 rdev->data_offset + mddev->dev_sectors
4484 printk("md: %s: data overlaps metadata\n",
4489 if (rdev->sb_start + rdev->sb_size/512
4490 > rdev->data_offset) {
4491 printk("md: %s: metadata overlaps data\n",
4496 sysfs_notify_dirent_safe(rdev->sysfs_state);
4499 if (mddev->bio_set == NULL)
4500 mddev->bio_set = bioset_create(BIO_POOL_SIZE,
4503 spin_lock(&pers_lock);
4504 pers = find_pers(mddev->level, mddev->clevel);
4505 if (!pers || !try_module_get(pers->owner)) {
4506 spin_unlock(&pers_lock);
4507 if (mddev->level != LEVEL_NONE)
4508 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
4511 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
4516 spin_unlock(&pers_lock);
4517 if (mddev->level != pers->level) {
4518 mddev->level = pers->level;
4519 mddev->new_level = pers->level;
4521 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
4523 if (mddev->reshape_position != MaxSector &&
4524 pers->start_reshape == NULL) {
4525 /* This personality cannot handle reshaping... */
4527 module_put(pers->owner);
4531 if (pers->sync_request) {
4532 /* Warn if this is a potentially silly
4535 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
4539 list_for_each_entry(rdev, &mddev->disks, same_set)
4540 list_for_each_entry(rdev2, &mddev->disks, same_set) {
4542 rdev->bdev->bd_contains ==
4543 rdev2->bdev->bd_contains) {
4545 "%s: WARNING: %s appears to be"
4546 " on the same physical disk as"
4549 bdevname(rdev->bdev,b),
4550 bdevname(rdev2->bdev,b2));
4557 "True protection against single-disk"
4558 " failure might be compromised.\n");
4561 mddev->recovery = 0;
4562 /* may be over-ridden by personality */
4563 mddev->resync_max_sectors = mddev->dev_sectors;
4565 mddev->ok_start_degraded = start_dirty_degraded;
4567 if (start_readonly && mddev->ro == 0)
4568 mddev->ro = 2; /* read-only, but switch on first write */
4570 err = mddev->pers->run(mddev);
4572 printk(KERN_ERR "md: pers->run() failed ...\n");
4573 else if (mddev->pers->size(mddev, 0, 0) < mddev->array_sectors) {
4574 WARN_ONCE(!mddev->external_size, "%s: default size too small,"
4575 " but 'external_size' not in effect?\n", __func__);
4577 "md: invalid array_size %llu > default size %llu\n",
4578 (unsigned long long)mddev->array_sectors / 2,
4579 (unsigned long long)mddev->pers->size(mddev, 0, 0) / 2);
4581 mddev->pers->stop(mddev);
4583 if (err == 0 && mddev->pers->sync_request) {
4584 err = bitmap_create(mddev);
4586 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
4587 mdname(mddev), err);
4588 mddev->pers->stop(mddev);
4592 module_put(mddev->pers->owner);
4594 bitmap_destroy(mddev);
4597 if (mddev->pers->sync_request) {
4598 if (mddev->kobj.sd &&
4599 sysfs_create_group(&mddev->kobj, &md_redundancy_group))
4601 "md: cannot register extra attributes for %s\n",
4603 mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action");
4604 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
4607 atomic_set(&mddev->writes_pending,0);
4608 atomic_set(&mddev->max_corr_read_errors,
4609 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS);
4610 mddev->safemode = 0;
4611 mddev->safemode_timer.function = md_safemode_timeout;
4612 mddev->safemode_timer.data = (unsigned long) mddev;
4613 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
4617 list_for_each_entry(rdev, &mddev->disks, same_set)
4618 if (rdev->raid_disk >= 0)
4619 if (sysfs_link_rdev(mddev, rdev))
4620 /* failure here is OK */;
4622 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4625 md_update_sb(mddev, 0);
4627 md_new_event(mddev);
4628 sysfs_notify_dirent_safe(mddev->sysfs_state);
4629 sysfs_notify_dirent_safe(mddev->sysfs_action);
4630 sysfs_notify(&mddev->kobj, NULL, "degraded");
4633 EXPORT_SYMBOL_GPL(md_run);
4635 static int do_md_run(mddev_t *mddev)
4639 err = md_run(mddev);
4642 err = bitmap_load(mddev);
4644 bitmap_destroy(mddev);
4648 md_wakeup_thread(mddev->thread);
4649 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
4651 set_capacity(mddev->gendisk, mddev->array_sectors);
4652 revalidate_disk(mddev->gendisk);
4654 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
4659 static int restart_array(mddev_t *mddev)
4661 struct gendisk *disk = mddev->gendisk;
4663 /* Complain if it has no devices */
4664 if (list_empty(&mddev->disks))
4670 mddev->safemode = 0;
4672 set_disk_ro(disk, 0);
4673 printk(KERN_INFO "md: %s switched to read-write mode.\n",
4675 /* Kick recovery or resync if necessary */
4676 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4677 md_wakeup_thread(mddev->thread);
4678 md_wakeup_thread(mddev->sync_thread);
4679 sysfs_notify_dirent_safe(mddev->sysfs_state);
4683 /* similar to deny_write_access, but accounts for our holding a reference
4684 * to the file ourselves */
4685 static int deny_bitmap_write_access(struct file * file)
4687 struct inode *inode = file->f_mapping->host;
4689 spin_lock(&inode->i_lock);
4690 if (atomic_read(&inode->i_writecount) > 1) {
4691 spin_unlock(&inode->i_lock);
4694 atomic_set(&inode->i_writecount, -1);
4695 spin_unlock(&inode->i_lock);
4700 void restore_bitmap_write_access(struct file *file)
4702 struct inode *inode = file->f_mapping->host;
4704 spin_lock(&inode->i_lock);
4705 atomic_set(&inode->i_writecount, 1);
4706 spin_unlock(&inode->i_lock);
4709 static void md_clean(mddev_t *mddev)
4711 mddev->array_sectors = 0;
4712 mddev->external_size = 0;
4713 mddev->dev_sectors = 0;
4714 mddev->raid_disks = 0;
4715 mddev->recovery_cp = 0;
4716 mddev->resync_min = 0;
4717 mddev->resync_max = MaxSector;
4718 mddev->reshape_position = MaxSector;
4719 mddev->external = 0;
4720 mddev->persistent = 0;
4721 mddev->level = LEVEL_NONE;
4722 mddev->clevel[0] = 0;
4725 mddev->metadata_type[0] = 0;
4726 mddev->chunk_sectors = 0;
4727 mddev->ctime = mddev->utime = 0;
4729 mddev->max_disks = 0;
4731 mddev->can_decrease_events = 0;
4732 mddev->delta_disks = 0;
4733 mddev->new_level = LEVEL_NONE;
4734 mddev->new_layout = 0;
4735 mddev->new_chunk_sectors = 0;
4736 mddev->curr_resync = 0;
4737 mddev->resync_mismatches = 0;
4738 mddev->suspend_lo = mddev->suspend_hi = 0;
4739 mddev->sync_speed_min = mddev->sync_speed_max = 0;
4740 mddev->recovery = 0;
4743 mddev->degraded = 0;
4744 mddev->safemode = 0;
4745 mddev->bitmap_info.offset = 0;
4746 mddev->bitmap_info.default_offset = 0;
4747 mddev->bitmap_info.chunksize = 0;
4748 mddev->bitmap_info.daemon_sleep = 0;
4749 mddev->bitmap_info.max_write_behind = 0;
4752 static void __md_stop_writes(mddev_t *mddev)
4754 if (mddev->sync_thread) {
4755 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4756 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4757 reap_sync_thread(mddev);
4760 del_timer_sync(&mddev->safemode_timer);
4762 bitmap_flush(mddev);
4763 md_super_wait(mddev);
4765 if (!mddev->in_sync || mddev->flags) {
4766 /* mark array as shutdown cleanly */
4768 md_update_sb(mddev, 1);
4772 void md_stop_writes(mddev_t *mddev)
4775 __md_stop_writes(mddev);
4776 mddev_unlock(mddev);
4778 EXPORT_SYMBOL_GPL(md_stop_writes);
4780 void md_stop(mddev_t *mddev)
4783 mddev->pers->stop(mddev);
4784 if (mddev->pers->sync_request && mddev->to_remove == NULL)
4785 mddev->to_remove = &md_redundancy_group;
4786 module_put(mddev->pers->owner);
4788 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4790 EXPORT_SYMBOL_GPL(md_stop);
4792 static int md_set_readonly(mddev_t *mddev, int is_open)
4795 mutex_lock(&mddev->open_mutex);
4796 if (atomic_read(&mddev->openers) > is_open) {
4797 printk("md: %s still in use.\n",mdname(mddev));
4802 __md_stop_writes(mddev);
4808 set_disk_ro(mddev->gendisk, 1);
4809 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4810 sysfs_notify_dirent_safe(mddev->sysfs_state);
4814 mutex_unlock(&mddev->open_mutex);
4819 * 0 - completely stop and dis-assemble array
4820 * 2 - stop but do not disassemble array
4822 static int do_md_stop(mddev_t * mddev, int mode, int is_open)
4824 struct gendisk *disk = mddev->gendisk;
4827 mutex_lock(&mddev->open_mutex);
4828 if (atomic_read(&mddev->openers) > is_open ||
4829 mddev->sysfs_active) {
4830 printk("md: %s still in use.\n",mdname(mddev));
4831 mutex_unlock(&mddev->open_mutex);
4837 set_disk_ro(disk, 0);
4839 __md_stop_writes(mddev);
4841 mddev->queue->merge_bvec_fn = NULL;
4842 mddev->queue->backing_dev_info.congested_fn = NULL;
4844 /* tell userspace to handle 'inactive' */
4845 sysfs_notify_dirent_safe(mddev->sysfs_state);
4847 list_for_each_entry(rdev, &mddev->disks, same_set)
4848 if (rdev->raid_disk >= 0)
4849 sysfs_unlink_rdev(mddev, rdev);
4851 set_capacity(disk, 0);
4852 mutex_unlock(&mddev->open_mutex);
4854 revalidate_disk(disk);
4859 mutex_unlock(&mddev->open_mutex);
4861 * Free resources if final stop
4864 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
4866 bitmap_destroy(mddev);
4867 if (mddev->bitmap_info.file) {
4868 restore_bitmap_write_access(mddev->bitmap_info.file);
4869 fput(mddev->bitmap_info.file);
4870 mddev->bitmap_info.file = NULL;
4872 mddev->bitmap_info.offset = 0;
4874 export_array(mddev);
4877 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
4878 if (mddev->hold_active == UNTIL_STOP)
4879 mddev->hold_active = 0;
4881 blk_integrity_unregister(disk);
4882 md_new_event(mddev);
4883 sysfs_notify_dirent_safe(mddev->sysfs_state);
4888 static void autorun_array(mddev_t *mddev)
4893 if (list_empty(&mddev->disks))
4896 printk(KERN_INFO "md: running: ");
4898 list_for_each_entry(rdev, &mddev->disks, same_set) {
4899 char b[BDEVNAME_SIZE];
4900 printk("<%s>", bdevname(rdev->bdev,b));
4904 err = do_md_run(mddev);
4906 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
4907 do_md_stop(mddev, 0, 0);
4912 * lets try to run arrays based on all disks that have arrived
4913 * until now. (those are in pending_raid_disks)
4915 * the method: pick the first pending disk, collect all disks with
4916 * the same UUID, remove all from the pending list and put them into
4917 * the 'same_array' list. Then order this list based on superblock
4918 * update time (freshest comes first), kick out 'old' disks and
4919 * compare superblocks. If everything's fine then run it.
4921 * If "unit" is allocated, then bump its reference count
4923 static void autorun_devices(int part)
4925 mdk_rdev_t *rdev0, *rdev, *tmp;
4927 char b[BDEVNAME_SIZE];
4929 printk(KERN_INFO "md: autorun ...\n");
4930 while (!list_empty(&pending_raid_disks)) {
4933 LIST_HEAD(candidates);
4934 rdev0 = list_entry(pending_raid_disks.next,
4935 mdk_rdev_t, same_set);
4937 printk(KERN_INFO "md: considering %s ...\n",
4938 bdevname(rdev0->bdev,b));
4939 INIT_LIST_HEAD(&candidates);
4940 rdev_for_each_list(rdev, tmp, &pending_raid_disks)
4941 if (super_90_load(rdev, rdev0, 0) >= 0) {
4942 printk(KERN_INFO "md: adding %s ...\n",
4943 bdevname(rdev->bdev,b));
4944 list_move(&rdev->same_set, &candidates);
4947 * now we have a set of devices, with all of them having
4948 * mostly sane superblocks. It's time to allocate the
4952 dev = MKDEV(mdp_major,
4953 rdev0->preferred_minor << MdpMinorShift);
4954 unit = MINOR(dev) >> MdpMinorShift;
4956 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
4959 if (rdev0->preferred_minor != unit) {
4960 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
4961 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
4965 md_probe(dev, NULL, NULL);
4966 mddev = mddev_find(dev);
4967 if (!mddev || !mddev->gendisk) {
4971 "md: cannot allocate memory for md drive.\n");
4974 if (mddev_lock(mddev))
4975 printk(KERN_WARNING "md: %s locked, cannot run\n",
4977 else if (mddev->raid_disks || mddev->major_version
4978 || !list_empty(&mddev->disks)) {
4980 "md: %s already running, cannot run %s\n",
4981 mdname(mddev), bdevname(rdev0->bdev,b));
4982 mddev_unlock(mddev);
4984 printk(KERN_INFO "md: created %s\n", mdname(mddev));
4985 mddev->persistent = 1;
4986 rdev_for_each_list(rdev, tmp, &candidates) {
4987 list_del_init(&rdev->same_set);
4988 if (bind_rdev_to_array(rdev, mddev))
4991 autorun_array(mddev);
4992 mddev_unlock(mddev);
4994 /* on success, candidates will be empty, on error
4997 rdev_for_each_list(rdev, tmp, &candidates) {
4998 list_del_init(&rdev->same_set);
5003 printk(KERN_INFO "md: ... autorun DONE.\n");
5005 #endif /* !MODULE */
5007 static int get_version(void __user * arg)
5011 ver.major = MD_MAJOR_VERSION;
5012 ver.minor = MD_MINOR_VERSION;
5013 ver.patchlevel = MD_PATCHLEVEL_VERSION;
5015 if (copy_to_user(arg, &ver, sizeof(ver)))
5021 static int get_array_info(mddev_t * mddev, void __user * arg)
5023 mdu_array_info_t info;
5024 int nr,working,insync,failed,spare;
5027 nr=working=insync=failed=spare=0;
5028 list_for_each_entry(rdev, &mddev->disks, same_set) {
5030 if (test_bit(Faulty, &rdev->flags))
5034 if (test_bit(In_sync, &rdev->flags))
5041 info.major_version = mddev->major_version;
5042 info.minor_version = mddev->minor_version;
5043 info.patch_version = MD_PATCHLEVEL_VERSION;
5044 info.ctime = mddev->ctime;
5045 info.level = mddev->level;
5046 info.size = mddev->dev_sectors / 2;
5047 if (info.size != mddev->dev_sectors / 2) /* overflow */
5050 info.raid_disks = mddev->raid_disks;
5051 info.md_minor = mddev->md_minor;
5052 info.not_persistent= !mddev->persistent;
5054 info.utime = mddev->utime;
5057 info.state = (1<<MD_SB_CLEAN);
5058 if (mddev->bitmap && mddev->bitmap_info.offset)
5059 info.state = (1<<MD_SB_BITMAP_PRESENT);
5060 info.active_disks = insync;
5061 info.working_disks = working;
5062 info.failed_disks = failed;
5063 info.spare_disks = spare;
5065 info.layout = mddev->layout;
5066 info.chunk_size = mddev->chunk_sectors << 9;
5068 if (copy_to_user(arg, &info, sizeof(info)))
5074 static int get_bitmap_file(mddev_t * mddev, void __user * arg)
5076 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
5077 char *ptr, *buf = NULL;
5080 if (md_allow_write(mddev))
5081 file = kmalloc(sizeof(*file), GFP_NOIO);
5083 file = kmalloc(sizeof(*file), GFP_KERNEL);
5088 /* bitmap disabled, zero the first byte and copy out */
5089 if (!mddev->bitmap || !mddev->bitmap->file) {
5090 file->pathname[0] = '\0';
5094 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
5098 ptr = d_path(&mddev->bitmap->file->f_path, buf, sizeof(file->pathname));
5102 strcpy(file->pathname, ptr);
5106 if (copy_to_user(arg, file, sizeof(*file)))
5114 static int get_disk_info(mddev_t * mddev, void __user * arg)
5116 mdu_disk_info_t info;
5119 if (copy_from_user(&info, arg, sizeof(info)))
5122 rdev = find_rdev_nr(mddev, info.number);
5124 info.major = MAJOR(rdev->bdev->bd_dev);
5125 info.minor = MINOR(rdev->bdev->bd_dev);
5126 info.raid_disk = rdev->raid_disk;
5128 if (test_bit(Faulty, &rdev->flags))
5129 info.state |= (1<<MD_DISK_FAULTY);
5130 else if (test_bit(In_sync, &rdev->flags)) {
5131 info.state |= (1<<MD_DISK_ACTIVE);
5132 info.state |= (1<<MD_DISK_SYNC);
5134 if (test_bit(WriteMostly, &rdev->flags))
5135 info.state |= (1<<MD_DISK_WRITEMOSTLY);
5137 info.major = info.minor = 0;
5138 info.raid_disk = -1;
5139 info.state = (1<<MD_DISK_REMOVED);
5142 if (copy_to_user(arg, &info, sizeof(info)))
5148 static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
5150 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
5152 dev_t dev = MKDEV(info->major,info->minor);
5154 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
5157 if (!mddev->raid_disks) {
5159 /* expecting a device which has a superblock */
5160 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
5163 "md: md_import_device returned %ld\n",
5165 return PTR_ERR(rdev);
5167 if (!list_empty(&mddev->disks)) {
5168 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
5169 mdk_rdev_t, same_set);
5170 err = super_types[mddev->major_version]
5171 .load_super(rdev, rdev0, mddev->minor_version);
5174 "md: %s has different UUID to %s\n",
5175 bdevname(rdev->bdev,b),
5176 bdevname(rdev0->bdev,b2));
5181 err = bind_rdev_to_array(rdev, mddev);
5188 * add_new_disk can be used once the array is assembled
5189 * to add "hot spares". They must already have a superblock
5194 if (!mddev->pers->hot_add_disk) {
5196 "%s: personality does not support diskops!\n",
5200 if (mddev->persistent)
5201 rdev = md_import_device(dev, mddev->major_version,
5202 mddev->minor_version);
5204 rdev = md_import_device(dev, -1, -1);
5207 "md: md_import_device returned %ld\n",
5209 return PTR_ERR(rdev);
5211 /* set saved_raid_disk if appropriate */
5212 if (!mddev->persistent) {
5213 if (info->state & (1<<MD_DISK_SYNC) &&
5214 info->raid_disk < mddev->raid_disks) {
5215 rdev->raid_disk = info->raid_disk;
5216 set_bit(In_sync, &rdev->flags);
5218 rdev->raid_disk = -1;
5220 super_types[mddev->major_version].
5221 validate_super(mddev, rdev);
5222 if ((info->state & (1<<MD_DISK_SYNC)) &&
5223 (!test_bit(In_sync, &rdev->flags) ||
5224 rdev->raid_disk != info->raid_disk)) {
5225 /* This was a hot-add request, but events doesn't
5226 * match, so reject it.
5232 if (test_bit(In_sync, &rdev->flags))
5233 rdev->saved_raid_disk = rdev->raid_disk;
5235 rdev->saved_raid_disk = -1;
5237 clear_bit(In_sync, &rdev->flags); /* just to be sure */
5238 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
5239 set_bit(WriteMostly, &rdev->flags);
5241 clear_bit(WriteMostly, &rdev->flags);
5243 rdev->raid_disk = -1;
5244 err = bind_rdev_to_array(rdev, mddev);
5245 if (!err && !mddev->pers->hot_remove_disk) {
5246 /* If there is hot_add_disk but no hot_remove_disk
5247 * then added disks for geometry changes,
5248 * and should be added immediately.
5250 super_types[mddev->major_version].
5251 validate_super(mddev, rdev);
5252 err = mddev->pers->hot_add_disk(mddev, rdev);
5254 unbind_rdev_from_array(rdev);
5259 sysfs_notify_dirent_safe(rdev->sysfs_state);
5261 md_update_sb(mddev, 1);
5262 if (mddev->degraded)
5263 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
5264 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5266 md_new_event(mddev);
5267 md_wakeup_thread(mddev->thread);
5271 /* otherwise, add_new_disk is only allowed
5272 * for major_version==0 superblocks
5274 if (mddev->major_version != 0) {
5275 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
5280 if (!(info->state & (1<<MD_DISK_FAULTY))) {
5282 rdev = md_import_device(dev, -1, 0);
5285 "md: error, md_import_device() returned %ld\n",
5287 return PTR_ERR(rdev);
5289 rdev->desc_nr = info->number;
5290 if (info->raid_disk < mddev->raid_disks)
5291 rdev->raid_disk = info->raid_disk;
5293 rdev->raid_disk = -1;
5295 if (rdev->raid_disk < mddev->raid_disks)
5296 if (info->state & (1<<MD_DISK_SYNC))
5297 set_bit(In_sync, &rdev->flags);
5299 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
5300 set_bit(WriteMostly, &rdev->flags);
5302 if (!mddev->persistent) {
5303 printk(KERN_INFO "md: nonpersistent superblock ...\n");
5304 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
5306 rdev->sb_start = calc_dev_sboffset(rdev);
5307 rdev->sectors = rdev->sb_start;
5309 err = bind_rdev_to_array(rdev, mddev);
5319 static int hot_remove_disk(mddev_t * mddev, dev_t dev)
5321 char b[BDEVNAME_SIZE];
5324 rdev = find_rdev(mddev, dev);
5328 if (rdev->raid_disk >= 0)
5331 kick_rdev_from_array(rdev);
5332 md_update_sb(mddev, 1);
5333 md_new_event(mddev);
5337 printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n",
5338 bdevname(rdev->bdev,b), mdname(mddev));
5342 static int hot_add_disk(mddev_t * mddev, dev_t dev)
5344 char b[BDEVNAME_SIZE];
5351 if (mddev->major_version != 0) {
5352 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
5353 " version-0 superblocks.\n",
5357 if (!mddev->pers->hot_add_disk) {
5359 "%s: personality does not support diskops!\n",
5364 rdev = md_import_device(dev, -1, 0);
5367 "md: error, md_import_device() returned %ld\n",
5372 if (mddev->persistent)
5373 rdev->sb_start = calc_dev_sboffset(rdev);
5375 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
5377 rdev->sectors = rdev->sb_start;
5379 if (test_bit(Faulty, &rdev->flags)) {
5381 "md: can not hot-add faulty %s disk to %s!\n",
5382 bdevname(rdev->bdev,b), mdname(mddev));
5386 clear_bit(In_sync, &rdev->flags);
5388 rdev->saved_raid_disk = -1;
5389 err = bind_rdev_to_array(rdev, mddev);
5394 * The rest should better be atomic, we can have disk failures
5395 * noticed in interrupt contexts ...
5398 rdev->raid_disk = -1;
5400 md_update_sb(mddev, 1);
5403 * Kick recovery, maybe this spare has to be added to the
5404 * array immediately.
5406 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5407 md_wakeup_thread(mddev->thread);
5408 md_new_event(mddev);
5416 static int set_bitmap_file(mddev_t *mddev, int fd)
5421 if (!mddev->pers->quiesce)
5423 if (mddev->recovery || mddev->sync_thread)
5425 /* we should be able to change the bitmap.. */
5431 return -EEXIST; /* cannot add when bitmap is present */
5432 mddev->bitmap_info.file = fget(fd);
5434 if (mddev->bitmap_info.file == NULL) {
5435 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
5440 err = deny_bitmap_write_access(mddev->bitmap_info.file);
5442 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
5444 fput(mddev->bitmap_info.file);
5445 mddev->bitmap_info.file = NULL;
5448 mddev->bitmap_info.offset = 0; /* file overrides offset */
5449 } else if (mddev->bitmap == NULL)
5450 return -ENOENT; /* cannot remove what isn't there */
5453 mddev->pers->quiesce(mddev, 1);
5455 err = bitmap_create(mddev);
5457 err = bitmap_load(mddev);
5459 if (fd < 0 || err) {
5460 bitmap_destroy(mddev);
5461 fd = -1; /* make sure to put the file */
5463 mddev->pers->quiesce(mddev, 0);
5466 if (mddev->bitmap_info.file) {
5467 restore_bitmap_write_access(mddev->bitmap_info.file);
5468 fput(mddev->bitmap_info.file);
5470 mddev->bitmap_info.file = NULL;
5477 * set_array_info is used two different ways
5478 * The original usage is when creating a new array.
5479 * In this usage, raid_disks is > 0 and it together with
5480 * level, size, not_persistent,layout,chunksize determine the
5481 * shape of the array.
5482 * This will always create an array with a type-0.90.0 superblock.
5483 * The newer usage is when assembling an array.
5484 * In this case raid_disks will be 0, and the major_version field is
5485 * use to determine which style super-blocks are to be found on the devices.
5486 * The minor and patch _version numbers are also kept incase the
5487 * super_block handler wishes to interpret them.
5489 static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
5492 if (info->raid_disks == 0) {
5493 /* just setting version number for superblock loading */
5494 if (info->major_version < 0 ||
5495 info->major_version >= ARRAY_SIZE(super_types) ||
5496 super_types[info->major_version].name == NULL) {
5497 /* maybe try to auto-load a module? */
5499 "md: superblock version %d not known\n",
5500 info->major_version);
5503 mddev->major_version = info->major_version;
5504 mddev->minor_version = info->minor_version;
5505 mddev->patch_version = info->patch_version;
5506 mddev->persistent = !info->not_persistent;
5507 /* ensure mddev_put doesn't delete this now that there
5508 * is some minimal configuration.
5510 mddev->ctime = get_seconds();
5513 mddev->major_version = MD_MAJOR_VERSION;
5514 mddev->minor_version = MD_MINOR_VERSION;
5515 mddev->patch_version = MD_PATCHLEVEL_VERSION;
5516 mddev->ctime = get_seconds();
5518 mddev->level = info->level;
5519 mddev->clevel[0] = 0;
5520 mddev->dev_sectors = 2 * (sector_t)info->size;
5521 mddev->raid_disks = info->raid_disks;
5522 /* don't set md_minor, it is determined by which /dev/md* was
5525 if (info->state & (1<<MD_SB_CLEAN))
5526 mddev->recovery_cp = MaxSector;
5528 mddev->recovery_cp = 0;
5529 mddev->persistent = ! info->not_persistent;
5530 mddev->external = 0;
5532 mddev->layout = info->layout;
5533 mddev->chunk_sectors = info->chunk_size >> 9;
5535 mddev->max_disks = MD_SB_DISKS;
5537 if (mddev->persistent)
5539 set_bit(MD_CHANGE_DEVS, &mddev->flags);
5541 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
5542 mddev->bitmap_info.offset = 0;
5544 mddev->reshape_position = MaxSector;
5547 * Generate a 128 bit UUID
5549 get_random_bytes(mddev->uuid, 16);
5551 mddev->new_level = mddev->level;
5552 mddev->new_chunk_sectors = mddev->chunk_sectors;
5553 mddev->new_layout = mddev->layout;
5554 mddev->delta_disks = 0;
5559 void md_set_array_sectors(mddev_t *mddev, sector_t array_sectors)
5561 WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__);
5563 if (mddev->external_size)
5566 mddev->array_sectors = array_sectors;
5568 EXPORT_SYMBOL(md_set_array_sectors);
5570 static int update_size(mddev_t *mddev, sector_t num_sectors)
5574 int fit = (num_sectors == 0);
5576 if (mddev->pers->resize == NULL)
5578 /* The "num_sectors" is the number of sectors of each device that
5579 * is used. This can only make sense for arrays with redundancy.
5580 * linear and raid0 always use whatever space is available. We can only
5581 * consider changing this number if no resync or reconstruction is
5582 * happening, and if the new size is acceptable. It must fit before the
5583 * sb_start or, if that is <data_offset, it must fit before the size
5584 * of each device. If num_sectors is zero, we find the largest size
5587 if (mddev->sync_thread)
5590 /* Sorry, cannot grow a bitmap yet, just remove it,
5594 list_for_each_entry(rdev, &mddev->disks, same_set) {
5595 sector_t avail = rdev->sectors;
5597 if (fit && (num_sectors == 0 || num_sectors > avail))
5598 num_sectors = avail;
5599 if (avail < num_sectors)
5602 rv = mddev->pers->resize(mddev, num_sectors);
5604 revalidate_disk(mddev->gendisk);
5608 static int update_raid_disks(mddev_t *mddev, int raid_disks)
5611 /* change the number of raid disks */
5612 if (mddev->pers->check_reshape == NULL)
5614 if (raid_disks <= 0 ||
5615 (mddev->max_disks && raid_disks >= mddev->max_disks))
5617 if (mddev->sync_thread || mddev->reshape_position != MaxSector)
5619 mddev->delta_disks = raid_disks - mddev->raid_disks;
5621 rv = mddev->pers->check_reshape(mddev);
5623 mddev->delta_disks = 0;
5629 * update_array_info is used to change the configuration of an
5631 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
5632 * fields in the info are checked against the array.
5633 * Any differences that cannot be handled will cause an error.
5634 * Normally, only one change can be managed at a time.
5636 static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
5642 /* calculate expected state,ignoring low bits */
5643 if (mddev->bitmap && mddev->bitmap_info.offset)
5644 state |= (1 << MD_SB_BITMAP_PRESENT);
5646 if (mddev->major_version != info->major_version ||
5647 mddev->minor_version != info->minor_version ||
5648 /* mddev->patch_version != info->patch_version || */
5649 mddev->ctime != info->ctime ||
5650 mddev->level != info->level ||
5651 /* mddev->layout != info->layout || */
5652 !mddev->persistent != info->not_persistent||
5653 mddev->chunk_sectors != info->chunk_size >> 9 ||
5654 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
5655 ((state^info->state) & 0xfffffe00)
5658 /* Check there is only one change */
5659 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
5661 if (mddev->raid_disks != info->raid_disks)
5663 if (mddev->layout != info->layout)
5665 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT))
5672 if (mddev->layout != info->layout) {
5674 * we don't need to do anything at the md level, the
5675 * personality will take care of it all.
5677 if (mddev->pers->check_reshape == NULL)
5680 mddev->new_layout = info->layout;
5681 rv = mddev->pers->check_reshape(mddev);
5683 mddev->new_layout = mddev->layout;
5687 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
5688 rv = update_size(mddev, (sector_t)info->size * 2);
5690 if (mddev->raid_disks != info->raid_disks)
5691 rv = update_raid_disks(mddev, info->raid_disks);
5693 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
5694 if (mddev->pers->quiesce == NULL)
5696 if (mddev->recovery || mddev->sync_thread)
5698 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
5699 /* add the bitmap */
5702 if (mddev->bitmap_info.default_offset == 0)
5704 mddev->bitmap_info.offset =
5705 mddev->bitmap_info.default_offset;
5706 mddev->pers->quiesce(mddev, 1);
5707 rv = bitmap_create(mddev);
5709 rv = bitmap_load(mddev);
5711 bitmap_destroy(mddev);
5712 mddev->pers->quiesce(mddev, 0);
5714 /* remove the bitmap */
5717 if (mddev->bitmap->file)
5719 mddev->pers->quiesce(mddev, 1);
5720 bitmap_destroy(mddev);
5721 mddev->pers->quiesce(mddev, 0);
5722 mddev->bitmap_info.offset = 0;
5725 md_update_sb(mddev, 1);
5729 static int set_disk_faulty(mddev_t *mddev, dev_t dev)
5733 if (mddev->pers == NULL)
5736 rdev = find_rdev(mddev, dev);
5740 md_error(mddev, rdev);
5745 * We have a problem here : there is no easy way to give a CHS
5746 * virtual geometry. We currently pretend that we have a 2 heads
5747 * 4 sectors (with a BIG number of cylinders...). This drives
5748 * dosfs just mad... ;-)
5750 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
5752 mddev_t *mddev = bdev->bd_disk->private_data;
5756 geo->cylinders = mddev->array_sectors / 8;
5760 static int md_ioctl(struct block_device *bdev, fmode_t mode,
5761 unsigned int cmd, unsigned long arg)
5764 void __user *argp = (void __user *)arg;
5765 mddev_t *mddev = NULL;
5768 if (!capable(CAP_SYS_ADMIN))
5772 * Commands dealing with the RAID driver but not any
5778 err = get_version(argp);
5781 case PRINT_RAID_DEBUG:
5789 autostart_arrays(arg);
5796 * Commands creating/starting a new array:
5799 mddev = bdev->bd_disk->private_data;
5806 err = mddev_lock(mddev);
5809 "md: ioctl lock interrupted, reason %d, cmd %d\n",
5816 case SET_ARRAY_INFO:
5818 mdu_array_info_t info;
5820 memset(&info, 0, sizeof(info));
5821 else if (copy_from_user(&info, argp, sizeof(info))) {
5826 err = update_array_info(mddev, &info);
5828 printk(KERN_WARNING "md: couldn't update"
5829 " array info. %d\n", err);
5834 if (!list_empty(&mddev->disks)) {
5836 "md: array %s already has disks!\n",
5841 if (mddev->raid_disks) {
5843 "md: array %s already initialised!\n",
5848 err = set_array_info(mddev, &info);
5850 printk(KERN_WARNING "md: couldn't set"
5851 " array info. %d\n", err);
5861 * Commands querying/configuring an existing array:
5863 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
5864 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
5865 if ((!mddev->raid_disks && !mddev->external)
5866 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
5867 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
5868 && cmd != GET_BITMAP_FILE) {
5874 * Commands even a read-only array can execute:
5878 case GET_ARRAY_INFO:
5879 err = get_array_info(mddev, argp);
5882 case GET_BITMAP_FILE:
5883 err = get_bitmap_file(mddev, argp);
5887 err = get_disk_info(mddev, argp);
5890 case RESTART_ARRAY_RW:
5891 err = restart_array(mddev);
5895 err = do_md_stop(mddev, 0, 1);
5899 err = md_set_readonly(mddev, 1);
5903 if (get_user(ro, (int __user *)(arg))) {
5909 /* if the bdev is going readonly the value of mddev->ro
5910 * does not matter, no writes are coming
5915 /* are we are already prepared for writes? */
5919 /* transitioning to readauto need only happen for
5920 * arrays that call md_write_start
5923 err = restart_array(mddev);
5926 set_disk_ro(mddev->gendisk, 0);
5933 * The remaining ioctls are changing the state of the
5934 * superblock, so we do not allow them on read-only arrays.
5935 * However non-MD ioctls (e.g. get-size) will still come through
5936 * here and hit the 'default' below, so only disallow
5937 * 'md' ioctls, and switch to rw mode if started auto-readonly.
5939 if (_IOC_TYPE(cmd) == MD_MAJOR && mddev->ro && mddev->pers) {
5940 if (mddev->ro == 2) {
5942 sysfs_notify_dirent_safe(mddev->sysfs_state);
5943 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5944 md_wakeup_thread(mddev->thread);
5955 mdu_disk_info_t info;
5956 if (copy_from_user(&info, argp, sizeof(info)))
5959 err = add_new_disk(mddev, &info);
5963 case HOT_REMOVE_DISK:
5964 err = hot_remove_disk(mddev, new_decode_dev(arg));
5968 err = hot_add_disk(mddev, new_decode_dev(arg));
5971 case SET_DISK_FAULTY:
5972 err = set_disk_faulty(mddev, new_decode_dev(arg));
5976 err = do_md_run(mddev);
5979 case SET_BITMAP_FILE:
5980 err = set_bitmap_file(mddev, (int)arg);
5990 if (mddev->hold_active == UNTIL_IOCTL &&
5992 mddev->hold_active = 0;
5993 mddev_unlock(mddev);
6002 #ifdef CONFIG_COMPAT
6003 static int md_compat_ioctl(struct block_device *bdev, fmode_t mode,
6004 unsigned int cmd, unsigned long arg)
6007 case HOT_REMOVE_DISK:
6009 case SET_DISK_FAULTY:
6010 case SET_BITMAP_FILE:
6011 /* These take in integer arg, do not convert */
6014 arg = (unsigned long)compat_ptr(arg);
6018 return md_ioctl(bdev, mode, cmd, arg);
6020 #endif /* CONFIG_COMPAT */
6022 static int md_open(struct block_device *bdev, fmode_t mode)
6025 * Succeed if we can lock the mddev, which confirms that
6026 * it isn't being stopped right now.
6028 mddev_t *mddev = mddev_find(bdev->bd_dev);
6031 if (mddev->gendisk != bdev->bd_disk) {
6032 /* we are racing with mddev_put which is discarding this
6036 /* Wait until bdev->bd_disk is definitely gone */
6037 flush_workqueue(md_misc_wq);
6038 /* Then retry the open from the top */
6039 return -ERESTARTSYS;
6041 BUG_ON(mddev != bdev->bd_disk->private_data);
6043 if ((err = mutex_lock_interruptible(&mddev->open_mutex)))
6047 atomic_inc(&mddev->openers);
6048 mutex_unlock(&mddev->open_mutex);
6050 check_disk_change(bdev);
6055 static int md_release(struct gendisk *disk, fmode_t mode)
6057 mddev_t *mddev = disk->private_data;
6060 atomic_dec(&mddev->openers);
6066 static int md_media_changed(struct gendisk *disk)
6068 mddev_t *mddev = disk->private_data;
6070 return mddev->changed;
6073 static int md_revalidate(struct gendisk *disk)
6075 mddev_t *mddev = disk->private_data;
6080 static const struct block_device_operations md_fops =
6082 .owner = THIS_MODULE,
6084 .release = md_release,
6086 #ifdef CONFIG_COMPAT
6087 .compat_ioctl = md_compat_ioctl,
6089 .getgeo = md_getgeo,
6090 .media_changed = md_media_changed,
6091 .revalidate_disk= md_revalidate,
6094 static int md_thread(void * arg)
6096 mdk_thread_t *thread = arg;
6099 * md_thread is a 'system-thread', it's priority should be very
6100 * high. We avoid resource deadlocks individually in each
6101 * raid personality. (RAID5 does preallocation) We also use RR and
6102 * the very same RT priority as kswapd, thus we will never get
6103 * into a priority inversion deadlock.
6105 * we definitely have to have equal or higher priority than
6106 * bdflush, otherwise bdflush will deadlock if there are too
6107 * many dirty RAID5 blocks.
6110 allow_signal(SIGKILL);
6111 while (!kthread_should_stop()) {
6113 /* We need to wait INTERRUPTIBLE so that
6114 * we don't add to the load-average.
6115 * That means we need to be sure no signals are
6118 if (signal_pending(current))
6119 flush_signals(current);
6121 wait_event_interruptible_timeout
6123 test_bit(THREAD_WAKEUP, &thread->flags)
6124 || kthread_should_stop(),
6127 clear_bit(THREAD_WAKEUP, &thread->flags);
6128 if (!kthread_should_stop())
6129 thread->run(thread->mddev);
6135 void md_wakeup_thread(mdk_thread_t *thread)
6138 dprintk("md: waking up MD thread %s.\n", thread->tsk->comm);
6139 set_bit(THREAD_WAKEUP, &thread->flags);
6140 wake_up(&thread->wqueue);
6144 mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
6147 mdk_thread_t *thread;
6149 thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL);
6153 init_waitqueue_head(&thread->wqueue);
6156 thread->mddev = mddev;
6157 thread->timeout = MAX_SCHEDULE_TIMEOUT;
6158 thread->tsk = kthread_run(md_thread, thread,
6160 mdname(thread->mddev),
6161 name ?: mddev->pers->name);
6162 if (IS_ERR(thread->tsk)) {
6169 void md_unregister_thread(mdk_thread_t *thread)
6173 dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
6175 kthread_stop(thread->tsk);
6179 void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
6186 if (!rdev || test_bit(Faulty, &rdev->flags))
6189 if (mddev->external)
6190 set_bit(Blocked, &rdev->flags);
6192 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
6194 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
6195 __builtin_return_address(0),__builtin_return_address(1),
6196 __builtin_return_address(2),__builtin_return_address(3));
6200 if (!mddev->pers->error_handler)
6202 mddev->pers->error_handler(mddev,rdev);
6203 if (mddev->degraded)
6204 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6205 sysfs_notify_dirent_safe(rdev->sysfs_state);
6206 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6207 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6208 md_wakeup_thread(mddev->thread);
6209 if (mddev->event_work.func)
6210 queue_work(md_misc_wq, &mddev->event_work);
6211 md_new_event_inintr(mddev);
6214 /* seq_file implementation /proc/mdstat */
6216 static void status_unused(struct seq_file *seq)
6221 seq_printf(seq, "unused devices: ");
6223 list_for_each_entry(rdev, &pending_raid_disks, same_set) {
6224 char b[BDEVNAME_SIZE];
6226 seq_printf(seq, "%s ",
6227 bdevname(rdev->bdev,b));
6230 seq_printf(seq, "<none>");
6232 seq_printf(seq, "\n");
6236 static void status_resync(struct seq_file *seq, mddev_t * mddev)
6238 sector_t max_sectors, resync, res;
6239 unsigned long dt, db;
6242 unsigned int per_milli;
6244 resync = mddev->curr_resync - atomic_read(&mddev->recovery_active);
6246 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
6247 max_sectors = mddev->resync_max_sectors;
6249 max_sectors = mddev->dev_sectors;
6252 * Should not happen.
6258 /* Pick 'scale' such that (resync>>scale)*1000 will fit
6259 * in a sector_t, and (max_sectors>>scale) will fit in a
6260 * u32, as those are the requirements for sector_div.
6261 * Thus 'scale' must be at least 10
6264 if (sizeof(sector_t) > sizeof(unsigned long)) {
6265 while ( max_sectors/2 > (1ULL<<(scale+32)))
6268 res = (resync>>scale)*1000;
6269 sector_div(res, (u32)((max_sectors>>scale)+1));
6273 int i, x = per_milli/50, y = 20-x;
6274 seq_printf(seq, "[");
6275 for (i = 0; i < x; i++)
6276 seq_printf(seq, "=");
6277 seq_printf(seq, ">");
6278 for (i = 0; i < y; i++)
6279 seq_printf(seq, ".");
6280 seq_printf(seq, "] ");
6282 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
6283 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
6285 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
6287 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
6288 "resync" : "recovery"))),
6289 per_milli/10, per_milli % 10,
6290 (unsigned long long) resync/2,
6291 (unsigned long long) max_sectors/2);
6294 * dt: time from mark until now
6295 * db: blocks written from mark until now
6296 * rt: remaining time
6298 * rt is a sector_t, so could be 32bit or 64bit.
6299 * So we divide before multiply in case it is 32bit and close
6301 * We scale the divisor (db) by 32 to avoid losing precision
6302 * near the end of resync when the number of remaining sectors
6304 * We then divide rt by 32 after multiplying by db to compensate.
6305 * The '+1' avoids division by zero if db is very small.
6307 dt = ((jiffies - mddev->resync_mark) / HZ);
6309 db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active))
6310 - mddev->resync_mark_cnt;
6312 rt = max_sectors - resync; /* number of remaining sectors */
6313 sector_div(rt, db/32+1);
6317 seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60,
6318 ((unsigned long)rt % 60)/6);
6320 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
6323 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
6325 struct list_head *tmp;
6335 spin_lock(&all_mddevs_lock);
6336 list_for_each(tmp,&all_mddevs)
6338 mddev = list_entry(tmp, mddev_t, all_mddevs);
6340 spin_unlock(&all_mddevs_lock);
6343 spin_unlock(&all_mddevs_lock);
6345 return (void*)2;/* tail */
6349 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
6351 struct list_head *tmp;
6352 mddev_t *next_mddev, *mddev = v;
6358 spin_lock(&all_mddevs_lock);
6360 tmp = all_mddevs.next;
6362 tmp = mddev->all_mddevs.next;
6363 if (tmp != &all_mddevs)
6364 next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs));
6366 next_mddev = (void*)2;
6369 spin_unlock(&all_mddevs_lock);
6377 static void md_seq_stop(struct seq_file *seq, void *v)
6381 if (mddev && v != (void*)1 && v != (void*)2)
6385 struct mdstat_info {
6389 static int md_seq_show(struct seq_file *seq, void *v)
6394 struct mdstat_info *mi = seq->private;
6395 struct bitmap *bitmap;
6397 if (v == (void*)1) {
6398 struct mdk_personality *pers;
6399 seq_printf(seq, "Personalities : ");
6400 spin_lock(&pers_lock);
6401 list_for_each_entry(pers, &pers_list, list)
6402 seq_printf(seq, "[%s] ", pers->name);
6404 spin_unlock(&pers_lock);
6405 seq_printf(seq, "\n");
6406 mi->event = atomic_read(&md_event_count);
6409 if (v == (void*)2) {
6414 if (mddev_lock(mddev) < 0)
6417 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
6418 seq_printf(seq, "%s : %sactive", mdname(mddev),
6419 mddev->pers ? "" : "in");
6422 seq_printf(seq, " (read-only)");
6424 seq_printf(seq, " (auto-read-only)");
6425 seq_printf(seq, " %s", mddev->pers->name);
6429 list_for_each_entry(rdev, &mddev->disks, same_set) {
6430 char b[BDEVNAME_SIZE];
6431 seq_printf(seq, " %s[%d]",
6432 bdevname(rdev->bdev,b), rdev->desc_nr);
6433 if (test_bit(WriteMostly, &rdev->flags))
6434 seq_printf(seq, "(W)");
6435 if (test_bit(Faulty, &rdev->flags)) {
6436 seq_printf(seq, "(F)");
6438 } else if (rdev->raid_disk < 0)
6439 seq_printf(seq, "(S)"); /* spare */
6440 sectors += rdev->sectors;
6443 if (!list_empty(&mddev->disks)) {
6445 seq_printf(seq, "\n %llu blocks",
6446 (unsigned long long)
6447 mddev->array_sectors / 2);
6449 seq_printf(seq, "\n %llu blocks",
6450 (unsigned long long)sectors / 2);
6452 if (mddev->persistent) {
6453 if (mddev->major_version != 0 ||
6454 mddev->minor_version != 90) {
6455 seq_printf(seq," super %d.%d",
6456 mddev->major_version,
6457 mddev->minor_version);
6459 } else if (mddev->external)
6460 seq_printf(seq, " super external:%s",
6461 mddev->metadata_type);
6463 seq_printf(seq, " super non-persistent");
6466 mddev->pers->status(seq, mddev);
6467 seq_printf(seq, "\n ");
6468 if (mddev->pers->sync_request) {
6469 if (mddev->curr_resync > 2) {
6470 status_resync(seq, mddev);
6471 seq_printf(seq, "\n ");
6472 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
6473 seq_printf(seq, "\tresync=DELAYED\n ");
6474 else if (mddev->recovery_cp < MaxSector)
6475 seq_printf(seq, "\tresync=PENDING\n ");
6478 seq_printf(seq, "\n ");
6480 if ((bitmap = mddev->bitmap)) {
6481 unsigned long chunk_kb;
6482 unsigned long flags;
6483 spin_lock_irqsave(&bitmap->lock, flags);
6484 chunk_kb = mddev->bitmap_info.chunksize >> 10;
6485 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
6487 bitmap->pages - bitmap->missing_pages,
6489 (bitmap->pages - bitmap->missing_pages)
6490 << (PAGE_SHIFT - 10),
6491 chunk_kb ? chunk_kb : mddev->bitmap_info.chunksize,
6492 chunk_kb ? "KB" : "B");
6494 seq_printf(seq, ", file: ");
6495 seq_path(seq, &bitmap->file->f_path, " \t\n");
6498 seq_printf(seq, "\n");
6499 spin_unlock_irqrestore(&bitmap->lock, flags);
6502 seq_printf(seq, "\n");
6504 mddev_unlock(mddev);
6509 static const struct seq_operations md_seq_ops = {
6510 .start = md_seq_start,
6511 .next = md_seq_next,
6512 .stop = md_seq_stop,
6513 .show = md_seq_show,
6516 static int md_seq_open(struct inode *inode, struct file *file)
6519 struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL);
6523 error = seq_open(file, &md_seq_ops);
6527 struct seq_file *p = file->private_data;
6529 mi->event = atomic_read(&md_event_count);
6534 static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
6536 struct seq_file *m = filp->private_data;
6537 struct mdstat_info *mi = m->private;
6540 poll_wait(filp, &md_event_waiters, wait);
6542 /* always allow read */
6543 mask = POLLIN | POLLRDNORM;
6545 if (mi->event != atomic_read(&md_event_count))
6546 mask |= POLLERR | POLLPRI;
6550 static const struct file_operations md_seq_fops = {
6551 .owner = THIS_MODULE,
6552 .open = md_seq_open,
6554 .llseek = seq_lseek,
6555 .release = seq_release_private,
6556 .poll = mdstat_poll,
6559 int register_md_personality(struct mdk_personality *p)
6561 spin_lock(&pers_lock);
6562 list_add_tail(&p->list, &pers_list);
6563 printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level);
6564 spin_unlock(&pers_lock);
6568 int unregister_md_personality(struct mdk_personality *p)
6570 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
6571 spin_lock(&pers_lock);
6572 list_del_init(&p->list);
6573 spin_unlock(&pers_lock);
6577 static int is_mddev_idle(mddev_t *mddev, int init)
6585 rdev_for_each_rcu(rdev, mddev) {
6586 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
6587 curr_events = (int)part_stat_read(&disk->part0, sectors[0]) +
6588 (int)part_stat_read(&disk->part0, sectors[1]) -
6589 atomic_read(&disk->sync_io);
6590 /* sync IO will cause sync_io to increase before the disk_stats
6591 * as sync_io is counted when a request starts, and
6592 * disk_stats is counted when it completes.
6593 * So resync activity will cause curr_events to be smaller than
6594 * when there was no such activity.
6595 * non-sync IO will cause disk_stat to increase without
6596 * increasing sync_io so curr_events will (eventually)
6597 * be larger than it was before. Once it becomes
6598 * substantially larger, the test below will cause
6599 * the array to appear non-idle, and resync will slow
6601 * If there is a lot of outstanding resync activity when
6602 * we set last_event to curr_events, then all that activity
6603 * completing might cause the array to appear non-idle
6604 * and resync will be slowed down even though there might
6605 * not have been non-resync activity. This will only
6606 * happen once though. 'last_events' will soon reflect
6607 * the state where there is little or no outstanding
6608 * resync requests, and further resync activity will
6609 * always make curr_events less than last_events.
6612 if (init || curr_events - rdev->last_events > 64) {
6613 rdev->last_events = curr_events;
6621 void md_done_sync(mddev_t *mddev, int blocks, int ok)
6623 /* another "blocks" (512byte) blocks have been synced */
6624 atomic_sub(blocks, &mddev->recovery_active);
6625 wake_up(&mddev->recovery_wait);
6627 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6628 md_wakeup_thread(mddev->thread);
6629 // stop recovery, signal do_sync ....
6634 /* md_write_start(mddev, bi)
6635 * If we need to update some array metadata (e.g. 'active' flag
6636 * in superblock) before writing, schedule a superblock update
6637 * and wait for it to complete.
6639 void md_write_start(mddev_t *mddev, struct bio *bi)
6642 if (bio_data_dir(bi) != WRITE)
6645 BUG_ON(mddev->ro == 1);
6646 if (mddev->ro == 2) {
6647 /* need to switch to read/write */
6649 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6650 md_wakeup_thread(mddev->thread);
6651 md_wakeup_thread(mddev->sync_thread);
6654 atomic_inc(&mddev->writes_pending);
6655 if (mddev->safemode == 1)
6656 mddev->safemode = 0;
6657 if (mddev->in_sync) {
6658 spin_lock_irq(&mddev->write_lock);
6659 if (mddev->in_sync) {
6661 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6662 set_bit(MD_CHANGE_PENDING, &mddev->flags);
6663 md_wakeup_thread(mddev->thread);
6666 spin_unlock_irq(&mddev->write_lock);
6669 sysfs_notify_dirent_safe(mddev->sysfs_state);
6670 wait_event(mddev->sb_wait,
6671 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
6674 void md_write_end(mddev_t *mddev)
6676 if (atomic_dec_and_test(&mddev->writes_pending)) {
6677 if (mddev->safemode == 2)
6678 md_wakeup_thread(mddev->thread);
6679 else if (mddev->safemode_delay)
6680 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
6684 /* md_allow_write(mddev)
6685 * Calling this ensures that the array is marked 'active' so that writes
6686 * may proceed without blocking. It is important to call this before
6687 * attempting a GFP_KERNEL allocation while holding the mddev lock.
6688 * Must be called with mddev_lock held.
6690 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
6691 * is dropped, so return -EAGAIN after notifying userspace.
6693 int md_allow_write(mddev_t *mddev)
6699 if (!mddev->pers->sync_request)
6702 spin_lock_irq(&mddev->write_lock);
6703 if (mddev->in_sync) {
6705 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6706 set_bit(MD_CHANGE_PENDING, &mddev->flags);
6707 if (mddev->safemode_delay &&
6708 mddev->safemode == 0)
6709 mddev->safemode = 1;
6710 spin_unlock_irq(&mddev->write_lock);
6711 md_update_sb(mddev, 0);
6712 sysfs_notify_dirent_safe(mddev->sysfs_state);
6714 spin_unlock_irq(&mddev->write_lock);
6716 if (test_bit(MD_CHANGE_PENDING, &mddev->flags))
6721 EXPORT_SYMBOL_GPL(md_allow_write);
6723 #define SYNC_MARKS 10
6724 #define SYNC_MARK_STEP (3*HZ)
6725 void md_do_sync(mddev_t *mddev)
6728 unsigned int currspeed = 0,
6730 sector_t max_sectors,j, io_sectors;
6731 unsigned long mark[SYNC_MARKS];
6732 sector_t mark_cnt[SYNC_MARKS];
6734 struct list_head *tmp;
6735 sector_t last_check;
6740 /* just incase thread restarts... */
6741 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
6743 if (mddev->ro) /* never try to sync a read-only array */
6746 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
6747 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
6748 desc = "data-check";
6749 else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
6750 desc = "requested-resync";
6753 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
6758 /* we overload curr_resync somewhat here.
6759 * 0 == not engaged in resync at all
6760 * 2 == checking that there is no conflict with another sync
6761 * 1 == like 2, but have yielded to allow conflicting resync to
6763 * other == active in resync - this many blocks
6765 * Before starting a resync we must have set curr_resync to
6766 * 2, and then checked that every "conflicting" array has curr_resync
6767 * less than ours. When we find one that is the same or higher
6768 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
6769 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
6770 * This will mean we have to start checking from the beginning again.
6775 mddev->curr_resync = 2;
6778 if (kthread_should_stop())
6779 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6781 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
6783 for_each_mddev(mddev2, tmp) {
6784 if (mddev2 == mddev)
6786 if (!mddev->parallel_resync
6787 && mddev2->curr_resync
6788 && match_mddev_units(mddev, mddev2)) {
6790 if (mddev < mddev2 && mddev->curr_resync == 2) {
6791 /* arbitrarily yield */
6792 mddev->curr_resync = 1;
6793 wake_up(&resync_wait);
6795 if (mddev > mddev2 && mddev->curr_resync == 1)
6796 /* no need to wait here, we can wait the next
6797 * time 'round when curr_resync == 2
6800 /* We need to wait 'interruptible' so as not to
6801 * contribute to the load average, and not to
6802 * be caught by 'softlockup'
6804 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
6805 if (!kthread_should_stop() &&
6806 mddev2->curr_resync >= mddev->curr_resync) {
6807 printk(KERN_INFO "md: delaying %s of %s"
6808 " until %s has finished (they"
6809 " share one or more physical units)\n",
6810 desc, mdname(mddev), mdname(mddev2));
6812 if (signal_pending(current))
6813 flush_signals(current);
6815 finish_wait(&resync_wait, &wq);
6818 finish_wait(&resync_wait, &wq);
6821 } while (mddev->curr_resync < 2);
6824 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
6825 /* resync follows the size requested by the personality,
6826 * which defaults to physical size, but can be virtual size
6828 max_sectors = mddev->resync_max_sectors;
6829 mddev->resync_mismatches = 0;
6830 /* we don't use the checkpoint if there's a bitmap */
6831 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
6832 j = mddev->resync_min;
6833 else if (!mddev->bitmap)
6834 j = mddev->recovery_cp;
6836 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
6837 max_sectors = mddev->dev_sectors;
6839 /* recovery follows the physical size of devices */
6840 max_sectors = mddev->dev_sectors;
6843 list_for_each_entry_rcu(rdev, &mddev->disks, same_set)
6844 if (rdev->raid_disk >= 0 &&
6845 !test_bit(Faulty, &rdev->flags) &&
6846 !test_bit(In_sync, &rdev->flags) &&
6847 rdev->recovery_offset < j)
6848 j = rdev->recovery_offset;
6852 printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev));
6853 printk(KERN_INFO "md: minimum _guaranteed_ speed:"
6854 " %d KB/sec/disk.\n", speed_min(mddev));
6855 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
6856 "(but not more than %d KB/sec) for %s.\n",
6857 speed_max(mddev), desc);
6859 is_mddev_idle(mddev, 1); /* this initializes IO event counters */
6862 for (m = 0; m < SYNC_MARKS; m++) {
6864 mark_cnt[m] = io_sectors;
6867 mddev->resync_mark = mark[last_mark];
6868 mddev->resync_mark_cnt = mark_cnt[last_mark];
6871 * Tune reconstruction:
6873 window = 32*(PAGE_SIZE/512);
6874 printk(KERN_INFO "md: using %dk window, over a total of %lluk.\n",
6875 window/2, (unsigned long long)max_sectors/2);
6877 atomic_set(&mddev->recovery_active, 0);
6882 "md: resuming %s of %s from checkpoint.\n",
6883 desc, mdname(mddev));
6884 mddev->curr_resync = j;
6886 mddev->curr_resync_completed = j;
6888 while (j < max_sectors) {
6893 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
6894 ((mddev->curr_resync > mddev->curr_resync_completed &&
6895 (mddev->curr_resync - mddev->curr_resync_completed)
6896 > (max_sectors >> 4)) ||
6897 (j - mddev->curr_resync_completed)*2
6898 >= mddev->resync_max - mddev->curr_resync_completed
6900 /* time to update curr_resync_completed */
6901 wait_event(mddev->recovery_wait,
6902 atomic_read(&mddev->recovery_active) == 0);
6903 mddev->curr_resync_completed = j;
6904 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6905 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
6908 while (j >= mddev->resync_max && !kthread_should_stop()) {
6909 /* As this condition is controlled by user-space,
6910 * we can block indefinitely, so use '_interruptible'
6911 * to avoid triggering warnings.
6913 flush_signals(current); /* just in case */
6914 wait_event_interruptible(mddev->recovery_wait,
6915 mddev->resync_max > j
6916 || kthread_should_stop());
6919 if (kthread_should_stop())
6922 sectors = mddev->pers->sync_request(mddev, j, &skipped,
6923 currspeed < speed_min(mddev));
6925 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6929 if (!skipped) { /* actual IO requested */
6930 io_sectors += sectors;
6931 atomic_add(sectors, &mddev->recovery_active);
6935 if (j>1) mddev->curr_resync = j;
6936 mddev->curr_mark_cnt = io_sectors;
6937 if (last_check == 0)
6938 /* this is the earliers that rebuilt will be
6939 * visible in /proc/mdstat
6941 md_new_event(mddev);
6943 if (last_check + window > io_sectors || j == max_sectors)
6946 last_check = io_sectors;
6948 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
6952 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
6954 int next = (last_mark+1) % SYNC_MARKS;
6956 mddev->resync_mark = mark[next];
6957 mddev->resync_mark_cnt = mark_cnt[next];
6958 mark[next] = jiffies;
6959 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
6964 if (kthread_should_stop())
6969 * this loop exits only if either when we are slower than
6970 * the 'hard' speed limit, or the system was IO-idle for
6972 * the system might be non-idle CPU-wise, but we only care
6973 * about not overloading the IO subsystem. (things like an
6974 * e2fsck being done on the RAID array should execute fast)
6978 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
6979 /((jiffies-mddev->resync_mark)/HZ +1) +1;
6981 if (currspeed > speed_min(mddev)) {
6982 if ((currspeed > speed_max(mddev)) ||
6983 !is_mddev_idle(mddev, 0)) {
6989 printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc);
6991 * this also signals 'finished resyncing' to md_stop
6994 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
6996 /* tell personality that we are finished */
6997 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
6999 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
7000 mddev->curr_resync > 2) {
7001 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
7002 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
7003 if (mddev->curr_resync >= mddev->recovery_cp) {
7005 "md: checkpointing %s of %s.\n",
7006 desc, mdname(mddev));
7007 mddev->recovery_cp = mddev->curr_resync;
7010 mddev->recovery_cp = MaxSector;
7012 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
7013 mddev->curr_resync = MaxSector;
7015 list_for_each_entry_rcu(rdev, &mddev->disks, same_set)
7016 if (rdev->raid_disk >= 0 &&
7017 mddev->delta_disks >= 0 &&
7018 !test_bit(Faulty, &rdev->flags) &&
7019 !test_bit(In_sync, &rdev->flags) &&
7020 rdev->recovery_offset < mddev->curr_resync)
7021 rdev->recovery_offset = mddev->curr_resync;
7025 set_bit(MD_CHANGE_DEVS, &mddev->flags);
7028 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
7029 /* We completed so min/max setting can be forgotten if used. */
7030 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
7031 mddev->resync_min = 0;
7032 mddev->resync_max = MaxSector;
7033 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
7034 mddev->resync_min = mddev->curr_resync_completed;
7035 mddev->curr_resync = 0;
7036 wake_up(&resync_wait);
7037 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
7038 md_wakeup_thread(mddev->thread);
7043 * got a signal, exit.
7046 "md: md_do_sync() got signal ... exiting\n");
7047 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7051 EXPORT_SYMBOL_GPL(md_do_sync);
7053 static int remove_and_add_spares(mddev_t *mddev)
7058 mddev->curr_resync_completed = 0;
7060 list_for_each_entry(rdev, &mddev->disks, same_set)
7061 if (rdev->raid_disk >= 0 &&
7062 !test_bit(Blocked, &rdev->flags) &&
7063 (test_bit(Faulty, &rdev->flags) ||
7064 ! test_bit(In_sync, &rdev->flags)) &&
7065 atomic_read(&rdev->nr_pending)==0) {
7066 if (mddev->pers->hot_remove_disk(
7067 mddev, rdev->raid_disk)==0) {
7068 sysfs_unlink_rdev(mddev, rdev);
7069 rdev->raid_disk = -1;
7073 if (mddev->degraded) {
7074 list_for_each_entry(rdev, &mddev->disks, same_set) {
7075 if (rdev->raid_disk >= 0 &&
7076 !test_bit(In_sync, &rdev->flags) &&
7077 !test_bit(Faulty, &rdev->flags) &&
7078 !test_bit(Blocked, &rdev->flags))
7080 if (rdev->raid_disk < 0
7081 && !test_bit(Faulty, &rdev->flags)) {
7082 rdev->recovery_offset = 0;
7084 hot_add_disk(mddev, rdev) == 0) {
7085 if (sysfs_link_rdev(mddev, rdev))
7086 /* failure here is OK */;
7088 md_new_event(mddev);
7089 set_bit(MD_CHANGE_DEVS, &mddev->flags);
7098 static void reap_sync_thread(mddev_t *mddev)
7102 /* resync has finished, collect result */
7103 md_unregister_thread(mddev->sync_thread);
7104 mddev->sync_thread = NULL;
7105 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
7106 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
7108 /* activate any spares */
7109 if (mddev->pers->spare_active(mddev))
7110 sysfs_notify(&mddev->kobj, NULL,
7113 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
7114 mddev->pers->finish_reshape)
7115 mddev->pers->finish_reshape(mddev);
7116 md_update_sb(mddev, 1);
7118 /* if array is no-longer degraded, then any saved_raid_disk
7119 * information must be scrapped
7121 if (!mddev->degraded)
7122 list_for_each_entry(rdev, &mddev->disks, same_set)
7123 rdev->saved_raid_disk = -1;
7125 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7126 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7127 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
7128 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
7129 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
7130 /* flag recovery needed just to double check */
7131 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7132 sysfs_notify_dirent_safe(mddev->sysfs_action);
7133 md_new_event(mddev);
7134 if (mddev->event_work.func)
7135 queue_work(md_misc_wq, &mddev->event_work);
7139 * This routine is regularly called by all per-raid-array threads to
7140 * deal with generic issues like resync and super-block update.
7141 * Raid personalities that don't have a thread (linear/raid0) do not
7142 * need this as they never do any recovery or update the superblock.
7144 * It does not do any resync itself, but rather "forks" off other threads
7145 * to do that as needed.
7146 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
7147 * "->recovery" and create a thread at ->sync_thread.
7148 * When the thread finishes it sets MD_RECOVERY_DONE
7149 * and wakeups up this thread which will reap the thread and finish up.
7150 * This thread also removes any faulty devices (with nr_pending == 0).
7152 * The overall approach is:
7153 * 1/ if the superblock needs updating, update it.
7154 * 2/ If a recovery thread is running, don't do anything else.
7155 * 3/ If recovery has finished, clean up, possibly marking spares active.
7156 * 4/ If there are any faulty devices, remove them.
7157 * 5/ If array is degraded, try to add spares devices
7158 * 6/ If array has spares or is not in-sync, start a resync thread.
7160 void md_check_recovery(mddev_t *mddev)
7162 if (mddev->suspended)
7166 bitmap_daemon_work(mddev);
7168 if (signal_pending(current)) {
7169 if (mddev->pers->sync_request && !mddev->external) {
7170 printk(KERN_INFO "md: %s in immediate safe mode\n",
7172 mddev->safemode = 2;
7174 flush_signals(current);
7177 if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
7180 (mddev->flags & ~ (1<<MD_CHANGE_PENDING)) ||
7181 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
7182 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
7183 (mddev->external == 0 && mddev->safemode == 1) ||
7184 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
7185 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
7189 if (mddev_trylock(mddev)) {
7193 /* Only thing we do on a ro array is remove
7197 list_for_each_entry(rdev, &mddev->disks, same_set)
7198 if (rdev->raid_disk >= 0 &&
7199 !test_bit(Blocked, &rdev->flags) &&
7200 test_bit(Faulty, &rdev->flags) &&
7201 atomic_read(&rdev->nr_pending)==0) {
7202 if (mddev->pers->hot_remove_disk(
7203 mddev, rdev->raid_disk)==0) {
7204 sysfs_unlink_rdev(mddev, rdev);
7205 rdev->raid_disk = -1;
7208 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7212 if (!mddev->external) {
7214 spin_lock_irq(&mddev->write_lock);
7215 if (mddev->safemode &&
7216 !atomic_read(&mddev->writes_pending) &&
7218 mddev->recovery_cp == MaxSector) {
7221 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
7223 if (mddev->safemode == 1)
7224 mddev->safemode = 0;
7225 spin_unlock_irq(&mddev->write_lock);
7227 sysfs_notify_dirent_safe(mddev->sysfs_state);
7231 md_update_sb(mddev, 0);
7233 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
7234 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
7235 /* resync/recovery still happening */
7236 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7239 if (mddev->sync_thread) {
7240 reap_sync_thread(mddev);
7243 /* Set RUNNING before clearing NEEDED to avoid
7244 * any transients in the value of "sync_action".
7246 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7247 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7248 /* Clear some bits that don't mean anything, but
7251 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
7252 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
7254 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
7256 /* no recovery is running.
7257 * remove any failed drives, then
7258 * add spares if possible.
7259 * Spare are also removed and re-added, to allow
7260 * the personality to fail the re-add.
7263 if (mddev->reshape_position != MaxSector) {
7264 if (mddev->pers->check_reshape == NULL ||
7265 mddev->pers->check_reshape(mddev) != 0)
7266 /* Cannot proceed */
7268 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
7269 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7270 } else if ((spares = remove_and_add_spares(mddev))) {
7271 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7272 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
7273 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
7274 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7275 } else if (mddev->recovery_cp < MaxSector) {
7276 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7277 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7278 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
7279 /* nothing to be done ... */
7282 if (mddev->pers->sync_request) {
7283 if (spares && mddev->bitmap && ! mddev->bitmap->file) {
7284 /* We are adding a device or devices to an array
7285 * which has the bitmap stored on all devices.
7286 * So make sure all bitmap pages get written
7288 bitmap_write_all(mddev->bitmap);
7290 mddev->sync_thread = md_register_thread(md_do_sync,
7293 if (!mddev->sync_thread) {
7294 printk(KERN_ERR "%s: could not start resync"
7297 /* leave the spares where they are, it shouldn't hurt */
7298 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7299 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7300 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
7301 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
7302 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
7304 md_wakeup_thread(mddev->sync_thread);
7305 sysfs_notify_dirent_safe(mddev->sysfs_action);
7306 md_new_event(mddev);
7309 if (!mddev->sync_thread) {
7310 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7311 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
7313 if (mddev->sysfs_action)
7314 sysfs_notify_dirent_safe(mddev->sysfs_action);
7316 mddev_unlock(mddev);
7320 void md_wait_for_blocked_rdev(mdk_rdev_t *rdev, mddev_t *mddev)
7322 sysfs_notify_dirent_safe(rdev->sysfs_state);
7323 wait_event_timeout(rdev->blocked_wait,
7324 !test_bit(Blocked, &rdev->flags),
7325 msecs_to_jiffies(5000));
7326 rdev_dec_pending(rdev, mddev);
7328 EXPORT_SYMBOL(md_wait_for_blocked_rdev);
7330 static int md_notify_reboot(struct notifier_block *this,
7331 unsigned long code, void *x)
7333 struct list_head *tmp;
7336 if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) {
7338 printk(KERN_INFO "md: stopping all md devices.\n");
7340 for_each_mddev(mddev, tmp)
7341 if (mddev_trylock(mddev)) {
7342 /* Force a switch to readonly even array
7343 * appears to still be in use. Hence
7346 md_set_readonly(mddev, 100);
7347 mddev_unlock(mddev);
7350 * certain more exotic SCSI devices are known to be
7351 * volatile wrt too early system reboots. While the
7352 * right place to handle this issue is the given
7353 * driver, we do want to have a safe RAID driver ...
7360 static struct notifier_block md_notifier = {
7361 .notifier_call = md_notify_reboot,
7363 .priority = INT_MAX, /* before any real devices */
7366 static void md_geninit(void)
7368 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
7370 proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops);
7373 static int __init md_init(void)
7377 md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0);
7381 md_misc_wq = alloc_workqueue("md_misc", 0, 0);
7385 if ((ret = register_blkdev(MD_MAJOR, "md")) < 0)
7388 if ((ret = register_blkdev(0, "mdp")) < 0)
7392 blk_register_region(MKDEV(MD_MAJOR, 0), 1UL<<MINORBITS, THIS_MODULE,
7393 md_probe, NULL, NULL);
7394 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
7395 md_probe, NULL, NULL);
7397 register_reboot_notifier(&md_notifier);
7398 raid_table_header = register_sysctl_table(raid_root_table);
7404 unregister_blkdev(MD_MAJOR, "md");
7406 destroy_workqueue(md_misc_wq);
7408 destroy_workqueue(md_wq);
7416 * Searches all registered partitions for autorun RAID arrays
7420 static LIST_HEAD(all_detected_devices);
7421 struct detected_devices_node {
7422 struct list_head list;
7426 void md_autodetect_dev(dev_t dev)
7428 struct detected_devices_node *node_detected_dev;
7430 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
7431 if (node_detected_dev) {
7432 node_detected_dev->dev = dev;
7433 list_add_tail(&node_detected_dev->list, &all_detected_devices);
7435 printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed"
7436 ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev));
7441 static void autostart_arrays(int part)
7444 struct detected_devices_node *node_detected_dev;
7446 int i_scanned, i_passed;
7451 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
7453 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
7455 node_detected_dev = list_entry(all_detected_devices.next,
7456 struct detected_devices_node, list);
7457 list_del(&node_detected_dev->list);
7458 dev = node_detected_dev->dev;
7459 kfree(node_detected_dev);
7460 rdev = md_import_device(dev,0, 90);
7464 if (test_bit(Faulty, &rdev->flags)) {
7468 set_bit(AutoDetected, &rdev->flags);
7469 list_add(&rdev->same_set, &pending_raid_disks);
7473 printk(KERN_INFO "md: Scanned %d and added %d devices.\n",
7474 i_scanned, i_passed);
7476 autorun_devices(part);
7479 #endif /* !MODULE */
7481 static __exit void md_exit(void)
7484 struct list_head *tmp;
7486 blk_unregister_region(MKDEV(MD_MAJOR,0), 1U << MINORBITS);
7487 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
7489 unregister_blkdev(MD_MAJOR,"md");
7490 unregister_blkdev(mdp_major, "mdp");
7491 unregister_reboot_notifier(&md_notifier);
7492 unregister_sysctl_table(raid_table_header);
7493 remove_proc_entry("mdstat", NULL);
7494 for_each_mddev(mddev, tmp) {
7495 export_array(mddev);
7496 mddev->hold_active = 0;
7498 destroy_workqueue(md_misc_wq);
7499 destroy_workqueue(md_wq);
7502 subsys_initcall(md_init);
7503 module_exit(md_exit)
7505 static int get_ro(char *buffer, struct kernel_param *kp)
7507 return sprintf(buffer, "%d", start_readonly);
7509 static int set_ro(const char *val, struct kernel_param *kp)
7512 int num = simple_strtoul(val, &e, 10);
7513 if (*val && (*e == '\0' || *e == '\n')) {
7514 start_readonly = num;
7520 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
7521 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
7523 module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR);
7525 EXPORT_SYMBOL(register_md_personality);
7526 EXPORT_SYMBOL(unregister_md_personality);
7527 EXPORT_SYMBOL(md_error);
7528 EXPORT_SYMBOL(md_done_sync);
7529 EXPORT_SYMBOL(md_write_start);
7530 EXPORT_SYMBOL(md_write_end);
7531 EXPORT_SYMBOL(md_register_thread);
7532 EXPORT_SYMBOL(md_unregister_thread);
7533 EXPORT_SYMBOL(md_wakeup_thread);
7534 EXPORT_SYMBOL(md_check_recovery);
7535 MODULE_LICENSE("GPL");
7536 MODULE_DESCRIPTION("MD RAID framework");
7538 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);