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 kfree(rdev->badblocks.page);
1956 rdev->badblocks.count = 0;
1957 rdev->badblocks.page = NULL;
1958 /* We need to delay this, otherwise we can deadlock when
1959 * writing to 'remove' to "dev/state". We also need
1960 * to delay it due to rcu usage.
1963 INIT_WORK(&rdev->del_work, md_delayed_delete);
1964 kobject_get(&rdev->kobj);
1965 queue_work(md_misc_wq, &rdev->del_work);
1969 * prevent the device from being mounted, repartitioned or
1970 * otherwise reused by a RAID array (or any other kernel
1971 * subsystem), by bd_claiming the device.
1973 static int lock_rdev(mdk_rdev_t *rdev, dev_t dev, int shared)
1976 struct block_device *bdev;
1977 char b[BDEVNAME_SIZE];
1979 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
1980 shared ? (mdk_rdev_t *)lock_rdev : rdev);
1982 printk(KERN_ERR "md: could not open %s.\n",
1983 __bdevname(dev, b));
1984 return PTR_ERR(bdev);
1990 static void unlock_rdev(mdk_rdev_t *rdev)
1992 struct block_device *bdev = rdev->bdev;
1996 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
1999 void md_autodetect_dev(dev_t dev);
2001 static void export_rdev(mdk_rdev_t * rdev)
2003 char b[BDEVNAME_SIZE];
2004 printk(KERN_INFO "md: export_rdev(%s)\n",
2005 bdevname(rdev->bdev,b));
2010 if (test_bit(AutoDetected, &rdev->flags))
2011 md_autodetect_dev(rdev->bdev->bd_dev);
2014 kobject_put(&rdev->kobj);
2017 static void kick_rdev_from_array(mdk_rdev_t * rdev)
2019 unbind_rdev_from_array(rdev);
2023 static void export_array(mddev_t *mddev)
2025 mdk_rdev_t *rdev, *tmp;
2027 rdev_for_each(rdev, tmp, mddev) {
2032 kick_rdev_from_array(rdev);
2034 if (!list_empty(&mddev->disks))
2036 mddev->raid_disks = 0;
2037 mddev->major_version = 0;
2040 static void print_desc(mdp_disk_t *desc)
2042 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
2043 desc->major,desc->minor,desc->raid_disk,desc->state);
2046 static void print_sb_90(mdp_super_t *sb)
2051 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
2052 sb->major_version, sb->minor_version, sb->patch_version,
2053 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
2055 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
2056 sb->level, sb->size, sb->nr_disks, sb->raid_disks,
2057 sb->md_minor, sb->layout, sb->chunk_size);
2058 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
2059 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
2060 sb->utime, sb->state, sb->active_disks, sb->working_disks,
2061 sb->failed_disks, sb->spare_disks,
2062 sb->sb_csum, (unsigned long)sb->events_lo);
2065 for (i = 0; i < MD_SB_DISKS; i++) {
2068 desc = sb->disks + i;
2069 if (desc->number || desc->major || desc->minor ||
2070 desc->raid_disk || (desc->state && (desc->state != 4))) {
2071 printk(" D %2d: ", i);
2075 printk(KERN_INFO "md: THIS: ");
2076 print_desc(&sb->this_disk);
2079 static void print_sb_1(struct mdp_superblock_1 *sb)
2083 uuid = sb->set_uuid;
2085 "md: SB: (V:%u) (F:0x%08x) Array-ID:<%pU>\n"
2086 "md: Name: \"%s\" CT:%llu\n",
2087 le32_to_cpu(sb->major_version),
2088 le32_to_cpu(sb->feature_map),
2091 (unsigned long long)le64_to_cpu(sb->ctime)
2092 & MD_SUPERBLOCK_1_TIME_SEC_MASK);
2094 uuid = sb->device_uuid;
2096 "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu"
2098 "md: Dev:%08x UUID: %pU\n"
2099 "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n"
2100 "md: (MaxDev:%u) \n",
2101 le32_to_cpu(sb->level),
2102 (unsigned long long)le64_to_cpu(sb->size),
2103 le32_to_cpu(sb->raid_disks),
2104 le32_to_cpu(sb->layout),
2105 le32_to_cpu(sb->chunksize),
2106 (unsigned long long)le64_to_cpu(sb->data_offset),
2107 (unsigned long long)le64_to_cpu(sb->data_size),
2108 (unsigned long long)le64_to_cpu(sb->super_offset),
2109 (unsigned long long)le64_to_cpu(sb->recovery_offset),
2110 le32_to_cpu(sb->dev_number),
2113 (unsigned long long)le64_to_cpu(sb->utime) & MD_SUPERBLOCK_1_TIME_SEC_MASK,
2114 (unsigned long long)le64_to_cpu(sb->events),
2115 (unsigned long long)le64_to_cpu(sb->resync_offset),
2116 le32_to_cpu(sb->sb_csum),
2117 le32_to_cpu(sb->max_dev)
2121 static void print_rdev(mdk_rdev_t *rdev, int major_version)
2123 char b[BDEVNAME_SIZE];
2124 printk(KERN_INFO "md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n",
2125 bdevname(rdev->bdev, b), (unsigned long long)rdev->sectors,
2126 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
2128 if (rdev->sb_loaded) {
2129 printk(KERN_INFO "md: rdev superblock (MJ:%d):\n", major_version);
2130 switch (major_version) {
2132 print_sb_90(page_address(rdev->sb_page));
2135 print_sb_1(page_address(rdev->sb_page));
2139 printk(KERN_INFO "md: no rdev superblock!\n");
2142 static void md_print_devices(void)
2144 struct list_head *tmp;
2147 char b[BDEVNAME_SIZE];
2150 printk("md: **********************************\n");
2151 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
2152 printk("md: **********************************\n");
2153 for_each_mddev(mddev, tmp) {
2156 bitmap_print_sb(mddev->bitmap);
2158 printk("%s: ", mdname(mddev));
2159 list_for_each_entry(rdev, &mddev->disks, same_set)
2160 printk("<%s>", bdevname(rdev->bdev,b));
2163 list_for_each_entry(rdev, &mddev->disks, same_set)
2164 print_rdev(rdev, mddev->major_version);
2166 printk("md: **********************************\n");
2171 static void sync_sbs(mddev_t * mddev, int nospares)
2173 /* Update each superblock (in-memory image), but
2174 * if we are allowed to, skip spares which already
2175 * have the right event counter, or have one earlier
2176 * (which would mean they aren't being marked as dirty
2177 * with the rest of the array)
2180 list_for_each_entry(rdev, &mddev->disks, same_set) {
2181 if (rdev->sb_events == mddev->events ||
2183 rdev->raid_disk < 0 &&
2184 rdev->sb_events+1 == mddev->events)) {
2185 /* Don't update this superblock */
2186 rdev->sb_loaded = 2;
2188 sync_super(mddev, rdev);
2189 rdev->sb_loaded = 1;
2194 static void md_update_sb(mddev_t * mddev, int force_change)
2201 /* First make sure individual recovery_offsets are correct */
2202 list_for_each_entry(rdev, &mddev->disks, same_set) {
2203 if (rdev->raid_disk >= 0 &&
2204 mddev->delta_disks >= 0 &&
2205 !test_bit(In_sync, &rdev->flags) &&
2206 mddev->curr_resync_completed > rdev->recovery_offset)
2207 rdev->recovery_offset = mddev->curr_resync_completed;
2210 if (!mddev->persistent) {
2211 clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
2212 clear_bit(MD_CHANGE_DEVS, &mddev->flags);
2213 if (!mddev->external)
2214 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2215 wake_up(&mddev->sb_wait);
2219 spin_lock_irq(&mddev->write_lock);
2221 mddev->utime = get_seconds();
2223 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
2225 if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags))
2226 /* just a clean<-> dirty transition, possibly leave spares alone,
2227 * though if events isn't the right even/odd, we will have to do
2233 if (mddev->degraded)
2234 /* If the array is degraded, then skipping spares is both
2235 * dangerous and fairly pointless.
2236 * Dangerous because a device that was removed from the array
2237 * might have a event_count that still looks up-to-date,
2238 * so it can be re-added without a resync.
2239 * Pointless because if there are any spares to skip,
2240 * then a recovery will happen and soon that array won't
2241 * be degraded any more and the spare can go back to sleep then.
2245 sync_req = mddev->in_sync;
2247 /* If this is just a dirty<->clean transition, and the array is clean
2248 * and 'events' is odd, we can roll back to the previous clean state */
2250 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
2251 && mddev->can_decrease_events
2252 && mddev->events != 1) {
2254 mddev->can_decrease_events = 0;
2256 /* otherwise we have to go forward and ... */
2258 mddev->can_decrease_events = nospares;
2261 if (!mddev->events) {
2263 * oops, this 64-bit counter should never wrap.
2264 * Either we are in around ~1 trillion A.C., assuming
2265 * 1 reboot per second, or we have a bug:
2270 sync_sbs(mddev, nospares);
2271 spin_unlock_irq(&mddev->write_lock);
2274 "md: updating %s RAID superblock on device (in sync %d)\n",
2275 mdname(mddev),mddev->in_sync);
2277 bitmap_update_sb(mddev->bitmap);
2278 list_for_each_entry(rdev, &mddev->disks, same_set) {
2279 char b[BDEVNAME_SIZE];
2280 dprintk(KERN_INFO "md: ");
2281 if (rdev->sb_loaded != 1)
2282 continue; /* no noise on spare devices */
2283 if (test_bit(Faulty, &rdev->flags))
2284 dprintk("(skipping faulty ");
2286 dprintk("%s ", bdevname(rdev->bdev,b));
2287 if (!test_bit(Faulty, &rdev->flags)) {
2288 md_super_write(mddev,rdev,
2289 rdev->sb_start, rdev->sb_size,
2291 dprintk(KERN_INFO "(write) %s's sb offset: %llu\n",
2292 bdevname(rdev->bdev,b),
2293 (unsigned long long)rdev->sb_start);
2294 rdev->sb_events = mddev->events;
2298 if (mddev->level == LEVEL_MULTIPATH)
2299 /* only need to write one superblock... */
2302 md_super_wait(mddev);
2303 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2305 spin_lock_irq(&mddev->write_lock);
2306 if (mddev->in_sync != sync_req ||
2307 test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
2308 /* have to write it out again */
2309 spin_unlock_irq(&mddev->write_lock);
2312 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2313 spin_unlock_irq(&mddev->write_lock);
2314 wake_up(&mddev->sb_wait);
2315 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
2316 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
2320 /* words written to sysfs files may, or may not, be \n terminated.
2321 * We want to accept with case. For this we use cmd_match.
2323 static int cmd_match(const char *cmd, const char *str)
2325 /* See if cmd, written into a sysfs file, matches
2326 * str. They must either be the same, or cmd can
2327 * have a trailing newline
2329 while (*cmd && *str && *cmd == *str) {
2340 struct rdev_sysfs_entry {
2341 struct attribute attr;
2342 ssize_t (*show)(mdk_rdev_t *, char *);
2343 ssize_t (*store)(mdk_rdev_t *, const char *, size_t);
2347 state_show(mdk_rdev_t *rdev, char *page)
2352 if (test_bit(Faulty, &rdev->flags)) {
2353 len+= sprintf(page+len, "%sfaulty",sep);
2356 if (test_bit(In_sync, &rdev->flags)) {
2357 len += sprintf(page+len, "%sin_sync",sep);
2360 if (test_bit(WriteMostly, &rdev->flags)) {
2361 len += sprintf(page+len, "%swrite_mostly",sep);
2364 if (test_bit(Blocked, &rdev->flags)) {
2365 len += sprintf(page+len, "%sblocked", sep);
2368 if (!test_bit(Faulty, &rdev->flags) &&
2369 !test_bit(In_sync, &rdev->flags)) {
2370 len += sprintf(page+len, "%sspare", sep);
2373 return len+sprintf(page+len, "\n");
2377 state_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2380 * faulty - simulates and error
2381 * remove - disconnects the device
2382 * writemostly - sets write_mostly
2383 * -writemostly - clears write_mostly
2384 * blocked - sets the Blocked flag
2385 * -blocked - clears the Blocked flag
2386 * insync - sets Insync providing device isn't active
2389 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
2390 md_error(rdev->mddev, rdev);
2392 } else if (cmd_match(buf, "remove")) {
2393 if (rdev->raid_disk >= 0)
2396 mddev_t *mddev = rdev->mddev;
2397 kick_rdev_from_array(rdev);
2399 md_update_sb(mddev, 1);
2400 md_new_event(mddev);
2403 } else if (cmd_match(buf, "writemostly")) {
2404 set_bit(WriteMostly, &rdev->flags);
2406 } else if (cmd_match(buf, "-writemostly")) {
2407 clear_bit(WriteMostly, &rdev->flags);
2409 } else if (cmd_match(buf, "blocked")) {
2410 set_bit(Blocked, &rdev->flags);
2412 } else if (cmd_match(buf, "-blocked")) {
2413 clear_bit(Blocked, &rdev->flags);
2414 wake_up(&rdev->blocked_wait);
2415 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2416 md_wakeup_thread(rdev->mddev->thread);
2419 } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) {
2420 set_bit(In_sync, &rdev->flags);
2424 sysfs_notify_dirent_safe(rdev->sysfs_state);
2425 return err ? err : len;
2427 static struct rdev_sysfs_entry rdev_state =
2428 __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store);
2431 errors_show(mdk_rdev_t *rdev, char *page)
2433 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
2437 errors_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2440 unsigned long n = simple_strtoul(buf, &e, 10);
2441 if (*buf && (*e == 0 || *e == '\n')) {
2442 atomic_set(&rdev->corrected_errors, n);
2447 static struct rdev_sysfs_entry rdev_errors =
2448 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
2451 slot_show(mdk_rdev_t *rdev, char *page)
2453 if (rdev->raid_disk < 0)
2454 return sprintf(page, "none\n");
2456 return sprintf(page, "%d\n", rdev->raid_disk);
2460 slot_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2464 int slot = simple_strtoul(buf, &e, 10);
2465 if (strncmp(buf, "none", 4)==0)
2467 else if (e==buf || (*e && *e!= '\n'))
2469 if (rdev->mddev->pers && slot == -1) {
2470 /* Setting 'slot' on an active array requires also
2471 * updating the 'rd%d' link, and communicating
2472 * with the personality with ->hot_*_disk.
2473 * For now we only support removing
2474 * failed/spare devices. This normally happens automatically,
2475 * but not when the metadata is externally managed.
2477 if (rdev->raid_disk == -1)
2479 /* personality does all needed checks */
2480 if (rdev->mddev->pers->hot_remove_disk == NULL)
2482 err = rdev->mddev->pers->
2483 hot_remove_disk(rdev->mddev, rdev->raid_disk);
2486 sysfs_unlink_rdev(rdev->mddev, rdev);
2487 rdev->raid_disk = -1;
2488 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2489 md_wakeup_thread(rdev->mddev->thread);
2490 } else if (rdev->mddev->pers) {
2492 /* Activating a spare .. or possibly reactivating
2493 * if we ever get bitmaps working here.
2496 if (rdev->raid_disk != -1)
2499 if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery))
2502 if (rdev->mddev->pers->hot_add_disk == NULL)
2505 list_for_each_entry(rdev2, &rdev->mddev->disks, same_set)
2506 if (rdev2->raid_disk == slot)
2509 if (slot >= rdev->mddev->raid_disks &&
2510 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
2513 rdev->raid_disk = slot;
2514 if (test_bit(In_sync, &rdev->flags))
2515 rdev->saved_raid_disk = slot;
2517 rdev->saved_raid_disk = -1;
2518 err = rdev->mddev->pers->
2519 hot_add_disk(rdev->mddev, rdev);
2521 rdev->raid_disk = -1;
2524 sysfs_notify_dirent_safe(rdev->sysfs_state);
2525 if (sysfs_link_rdev(rdev->mddev, rdev))
2526 /* failure here is OK */;
2527 /* don't wakeup anyone, leave that to userspace. */
2529 if (slot >= rdev->mddev->raid_disks &&
2530 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
2532 rdev->raid_disk = slot;
2533 /* assume it is working */
2534 clear_bit(Faulty, &rdev->flags);
2535 clear_bit(WriteMostly, &rdev->flags);
2536 set_bit(In_sync, &rdev->flags);
2537 sysfs_notify_dirent_safe(rdev->sysfs_state);
2543 static struct rdev_sysfs_entry rdev_slot =
2544 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
2547 offset_show(mdk_rdev_t *rdev, char *page)
2549 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
2553 offset_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2556 unsigned long long offset = simple_strtoull(buf, &e, 10);
2557 if (e==buf || (*e && *e != '\n'))
2559 if (rdev->mddev->pers && rdev->raid_disk >= 0)
2561 if (rdev->sectors && rdev->mddev->external)
2562 /* Must set offset before size, so overlap checks
2565 rdev->data_offset = offset;
2569 static struct rdev_sysfs_entry rdev_offset =
2570 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
2573 rdev_size_show(mdk_rdev_t *rdev, char *page)
2575 return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2);
2578 static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
2580 /* check if two start/length pairs overlap */
2588 static int strict_blocks_to_sectors(const char *buf, sector_t *sectors)
2590 unsigned long long blocks;
2593 if (strict_strtoull(buf, 10, &blocks) < 0)
2596 if (blocks & 1ULL << (8 * sizeof(blocks) - 1))
2597 return -EINVAL; /* sector conversion overflow */
2600 if (new != blocks * 2)
2601 return -EINVAL; /* unsigned long long to sector_t overflow */
2608 rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2610 mddev_t *my_mddev = rdev->mddev;
2611 sector_t oldsectors = rdev->sectors;
2614 if (strict_blocks_to_sectors(buf, §ors) < 0)
2616 if (my_mddev->pers && rdev->raid_disk >= 0) {
2617 if (my_mddev->persistent) {
2618 sectors = super_types[my_mddev->major_version].
2619 rdev_size_change(rdev, sectors);
2622 } else if (!sectors)
2623 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) -
2626 if (sectors < my_mddev->dev_sectors)
2627 return -EINVAL; /* component must fit device */
2629 rdev->sectors = sectors;
2630 if (sectors > oldsectors && my_mddev->external) {
2631 /* need to check that all other rdevs with the same ->bdev
2632 * do not overlap. We need to unlock the mddev to avoid
2633 * a deadlock. We have already changed rdev->sectors, and if
2634 * we have to change it back, we will have the lock again.
2638 struct list_head *tmp;
2640 mddev_unlock(my_mddev);
2641 for_each_mddev(mddev, tmp) {
2645 list_for_each_entry(rdev2, &mddev->disks, same_set)
2646 if (rdev->bdev == rdev2->bdev &&
2648 overlaps(rdev->data_offset, rdev->sectors,
2654 mddev_unlock(mddev);
2660 mddev_lock(my_mddev);
2662 /* Someone else could have slipped in a size
2663 * change here, but doing so is just silly.
2664 * We put oldsectors back because we *know* it is
2665 * safe, and trust userspace not to race with
2668 rdev->sectors = oldsectors;
2675 static struct rdev_sysfs_entry rdev_size =
2676 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
2679 static ssize_t recovery_start_show(mdk_rdev_t *rdev, char *page)
2681 unsigned long long recovery_start = rdev->recovery_offset;
2683 if (test_bit(In_sync, &rdev->flags) ||
2684 recovery_start == MaxSector)
2685 return sprintf(page, "none\n");
2687 return sprintf(page, "%llu\n", recovery_start);
2690 static ssize_t recovery_start_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2692 unsigned long long recovery_start;
2694 if (cmd_match(buf, "none"))
2695 recovery_start = MaxSector;
2696 else if (strict_strtoull(buf, 10, &recovery_start))
2699 if (rdev->mddev->pers &&
2700 rdev->raid_disk >= 0)
2703 rdev->recovery_offset = recovery_start;
2704 if (recovery_start == MaxSector)
2705 set_bit(In_sync, &rdev->flags);
2707 clear_bit(In_sync, &rdev->flags);
2711 static struct rdev_sysfs_entry rdev_recovery_start =
2712 __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store);
2716 badblocks_show(struct badblocks *bb, char *page, int unack);
2718 badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack);
2720 static ssize_t bb_show(mdk_rdev_t *rdev, char *page)
2722 return badblocks_show(&rdev->badblocks, page, 0);
2724 static ssize_t bb_store(mdk_rdev_t *rdev, const char *page, size_t len)
2726 return badblocks_store(&rdev->badblocks, page, len, 0);
2728 static struct rdev_sysfs_entry rdev_bad_blocks =
2729 __ATTR(bad_blocks, S_IRUGO|S_IWUSR, bb_show, bb_store);
2732 static ssize_t ubb_show(mdk_rdev_t *rdev, char *page)
2734 return badblocks_show(&rdev->badblocks, page, 1);
2736 static ssize_t ubb_store(mdk_rdev_t *rdev, const char *page, size_t len)
2738 return badblocks_store(&rdev->badblocks, page, len, 1);
2740 static struct rdev_sysfs_entry rdev_unack_bad_blocks =
2741 __ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store);
2743 static struct attribute *rdev_default_attrs[] = {
2749 &rdev_recovery_start.attr,
2750 &rdev_bad_blocks.attr,
2751 &rdev_unack_bad_blocks.attr,
2755 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
2757 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2758 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
2759 mddev_t *mddev = rdev->mddev;
2765 rv = mddev ? mddev_lock(mddev) : -EBUSY;
2767 if (rdev->mddev == NULL)
2770 rv = entry->show(rdev, page);
2771 mddev_unlock(mddev);
2777 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
2778 const char *page, size_t length)
2780 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2781 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
2783 mddev_t *mddev = rdev->mddev;
2787 if (!capable(CAP_SYS_ADMIN))
2789 rv = mddev ? mddev_lock(mddev): -EBUSY;
2791 if (rdev->mddev == NULL)
2794 rv = entry->store(rdev, page, length);
2795 mddev_unlock(mddev);
2800 static void rdev_free(struct kobject *ko)
2802 mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj);
2805 static const struct sysfs_ops rdev_sysfs_ops = {
2806 .show = rdev_attr_show,
2807 .store = rdev_attr_store,
2809 static struct kobj_type rdev_ktype = {
2810 .release = rdev_free,
2811 .sysfs_ops = &rdev_sysfs_ops,
2812 .default_attrs = rdev_default_attrs,
2815 int md_rdev_init(mdk_rdev_t *rdev)
2818 rdev->saved_raid_disk = -1;
2819 rdev->raid_disk = -1;
2821 rdev->data_offset = 0;
2822 rdev->sb_events = 0;
2823 rdev->last_read_error.tv_sec = 0;
2824 rdev->last_read_error.tv_nsec = 0;
2825 atomic_set(&rdev->nr_pending, 0);
2826 atomic_set(&rdev->read_errors, 0);
2827 atomic_set(&rdev->corrected_errors, 0);
2829 INIT_LIST_HEAD(&rdev->same_set);
2830 init_waitqueue_head(&rdev->blocked_wait);
2832 /* Add space to store bad block list.
2833 * This reserves the space even on arrays where it cannot
2834 * be used - I wonder if that matters
2836 rdev->badblocks.count = 0;
2837 rdev->badblocks.shift = 0;
2838 rdev->badblocks.page = kmalloc(PAGE_SIZE, GFP_KERNEL);
2839 seqlock_init(&rdev->badblocks.lock);
2840 if (rdev->badblocks.page == NULL)
2845 EXPORT_SYMBOL_GPL(md_rdev_init);
2847 * Import a device. If 'super_format' >= 0, then sanity check the superblock
2849 * mark the device faulty if:
2851 * - the device is nonexistent (zero size)
2852 * - the device has no valid superblock
2854 * a faulty rdev _never_ has rdev->sb set.
2856 static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor)
2858 char b[BDEVNAME_SIZE];
2863 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
2865 printk(KERN_ERR "md: could not alloc mem for new device!\n");
2866 return ERR_PTR(-ENOMEM);
2869 err = md_rdev_init(rdev);
2872 err = alloc_disk_sb(rdev);
2876 err = lock_rdev(rdev, newdev, super_format == -2);
2880 kobject_init(&rdev->kobj, &rdev_ktype);
2882 size = i_size_read(rdev->bdev->bd_inode) >> BLOCK_SIZE_BITS;
2885 "md: %s has zero or unknown size, marking faulty!\n",
2886 bdevname(rdev->bdev,b));
2891 if (super_format >= 0) {
2892 err = super_types[super_format].
2893 load_super(rdev, NULL, super_minor);
2894 if (err == -EINVAL) {
2896 "md: %s does not have a valid v%d.%d "
2897 "superblock, not importing!\n",
2898 bdevname(rdev->bdev,b),
2899 super_format, super_minor);
2904 "md: could not read %s's sb, not importing!\n",
2905 bdevname(rdev->bdev,b));
2913 if (rdev->sb_page) {
2918 kfree(rdev->badblocks.page);
2920 return ERR_PTR(err);
2924 * Check a full RAID array for plausibility
2928 static void analyze_sbs(mddev_t * mddev)
2931 mdk_rdev_t *rdev, *freshest, *tmp;
2932 char b[BDEVNAME_SIZE];
2935 rdev_for_each(rdev, tmp, mddev)
2936 switch (super_types[mddev->major_version].
2937 load_super(rdev, freshest, mddev->minor_version)) {
2945 "md: fatal superblock inconsistency in %s"
2946 " -- removing from array\n",
2947 bdevname(rdev->bdev,b));
2948 kick_rdev_from_array(rdev);
2952 super_types[mddev->major_version].
2953 validate_super(mddev, freshest);
2956 rdev_for_each(rdev, tmp, mddev) {
2957 if (mddev->max_disks &&
2958 (rdev->desc_nr >= mddev->max_disks ||
2959 i > mddev->max_disks)) {
2961 "md: %s: %s: only %d devices permitted\n",
2962 mdname(mddev), bdevname(rdev->bdev, b),
2964 kick_rdev_from_array(rdev);
2967 if (rdev != freshest)
2968 if (super_types[mddev->major_version].
2969 validate_super(mddev, rdev)) {
2970 printk(KERN_WARNING "md: kicking non-fresh %s"
2972 bdevname(rdev->bdev,b));
2973 kick_rdev_from_array(rdev);
2976 if (mddev->level == LEVEL_MULTIPATH) {
2977 rdev->desc_nr = i++;
2978 rdev->raid_disk = rdev->desc_nr;
2979 set_bit(In_sync, &rdev->flags);
2980 } else if (rdev->raid_disk >= (mddev->raid_disks - min(0, mddev->delta_disks))) {
2981 rdev->raid_disk = -1;
2982 clear_bit(In_sync, &rdev->flags);
2987 /* Read a fixed-point number.
2988 * Numbers in sysfs attributes should be in "standard" units where
2989 * possible, so time should be in seconds.
2990 * However we internally use a a much smaller unit such as
2991 * milliseconds or jiffies.
2992 * This function takes a decimal number with a possible fractional
2993 * component, and produces an integer which is the result of
2994 * multiplying that number by 10^'scale'.
2995 * all without any floating-point arithmetic.
2997 int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale)
2999 unsigned long result = 0;
3001 while (isdigit(*cp) || (*cp == '.' && decimals < 0)) {
3004 else if (decimals < scale) {
3007 result = result * 10 + value;
3019 while (decimals < scale) {
3028 static void md_safemode_timeout(unsigned long data);
3031 safe_delay_show(mddev_t *mddev, char *page)
3033 int msec = (mddev->safemode_delay*1000)/HZ;
3034 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
3037 safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len)
3041 if (strict_strtoul_scaled(cbuf, &msec, 3) < 0)
3044 mddev->safemode_delay = 0;
3046 unsigned long old_delay = mddev->safemode_delay;
3047 mddev->safemode_delay = (msec*HZ)/1000;
3048 if (mddev->safemode_delay == 0)
3049 mddev->safemode_delay = 1;
3050 if (mddev->safemode_delay < old_delay)
3051 md_safemode_timeout((unsigned long)mddev);
3055 static struct md_sysfs_entry md_safe_delay =
3056 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
3059 level_show(mddev_t *mddev, char *page)
3061 struct mdk_personality *p = mddev->pers;
3063 return sprintf(page, "%s\n", p->name);
3064 else if (mddev->clevel[0])
3065 return sprintf(page, "%s\n", mddev->clevel);
3066 else if (mddev->level != LEVEL_NONE)
3067 return sprintf(page, "%d\n", mddev->level);
3073 level_store(mddev_t *mddev, const char *buf, size_t len)
3077 struct mdk_personality *pers;
3082 if (mddev->pers == NULL) {
3085 if (len >= sizeof(mddev->clevel))
3087 strncpy(mddev->clevel, buf, len);
3088 if (mddev->clevel[len-1] == '\n')
3090 mddev->clevel[len] = 0;
3091 mddev->level = LEVEL_NONE;
3095 /* request to change the personality. Need to ensure:
3096 * - array is not engaged in resync/recovery/reshape
3097 * - old personality can be suspended
3098 * - new personality will access other array.
3101 if (mddev->sync_thread ||
3102 mddev->reshape_position != MaxSector ||
3103 mddev->sysfs_active)
3106 if (!mddev->pers->quiesce) {
3107 printk(KERN_WARNING "md: %s: %s does not support online personality change\n",
3108 mdname(mddev), mddev->pers->name);
3112 /* Now find the new personality */
3113 if (len == 0 || len >= sizeof(clevel))
3115 strncpy(clevel, buf, len);
3116 if (clevel[len-1] == '\n')
3119 if (strict_strtol(clevel, 10, &level))
3122 if (request_module("md-%s", clevel) != 0)
3123 request_module("md-level-%s", clevel);
3124 spin_lock(&pers_lock);
3125 pers = find_pers(level, clevel);
3126 if (!pers || !try_module_get(pers->owner)) {
3127 spin_unlock(&pers_lock);
3128 printk(KERN_WARNING "md: personality %s not loaded\n", clevel);
3131 spin_unlock(&pers_lock);
3133 if (pers == mddev->pers) {
3134 /* Nothing to do! */
3135 module_put(pers->owner);
3138 if (!pers->takeover) {
3139 module_put(pers->owner);
3140 printk(KERN_WARNING "md: %s: %s does not support personality takeover\n",
3141 mdname(mddev), clevel);
3145 list_for_each_entry(rdev, &mddev->disks, same_set)
3146 rdev->new_raid_disk = rdev->raid_disk;
3148 /* ->takeover must set new_* and/or delta_disks
3149 * if it succeeds, and may set them when it fails.
3151 priv = pers->takeover(mddev);
3153 mddev->new_level = mddev->level;
3154 mddev->new_layout = mddev->layout;
3155 mddev->new_chunk_sectors = mddev->chunk_sectors;
3156 mddev->raid_disks -= mddev->delta_disks;
3157 mddev->delta_disks = 0;
3158 module_put(pers->owner);
3159 printk(KERN_WARNING "md: %s: %s would not accept array\n",
3160 mdname(mddev), clevel);
3161 return PTR_ERR(priv);
3164 /* Looks like we have a winner */
3165 mddev_suspend(mddev);
3166 mddev->pers->stop(mddev);
3168 if (mddev->pers->sync_request == NULL &&
3169 pers->sync_request != NULL) {
3170 /* need to add the md_redundancy_group */
3171 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
3173 "md: cannot register extra attributes for %s\n",
3175 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, NULL, "sync_action");
3177 if (mddev->pers->sync_request != NULL &&
3178 pers->sync_request == NULL) {
3179 /* need to remove the md_redundancy_group */
3180 if (mddev->to_remove == NULL)
3181 mddev->to_remove = &md_redundancy_group;
3184 if (mddev->pers->sync_request == NULL &&
3186 /* We are converting from a no-redundancy array
3187 * to a redundancy array and metadata is managed
3188 * externally so we need to be sure that writes
3189 * won't block due to a need to transition
3191 * until external management is started.
3194 mddev->safemode_delay = 0;
3195 mddev->safemode = 0;
3198 list_for_each_entry(rdev, &mddev->disks, same_set) {
3199 if (rdev->raid_disk < 0)
3201 if (rdev->new_raid_disk >= mddev->raid_disks)
3202 rdev->new_raid_disk = -1;
3203 if (rdev->new_raid_disk == rdev->raid_disk)
3205 sysfs_unlink_rdev(mddev, rdev);
3207 list_for_each_entry(rdev, &mddev->disks, same_set) {
3208 if (rdev->raid_disk < 0)
3210 if (rdev->new_raid_disk == rdev->raid_disk)
3212 rdev->raid_disk = rdev->new_raid_disk;
3213 if (rdev->raid_disk < 0)
3214 clear_bit(In_sync, &rdev->flags);
3216 if (sysfs_link_rdev(mddev, rdev))
3217 printk(KERN_WARNING "md: cannot register rd%d"
3218 " for %s after level change\n",
3219 rdev->raid_disk, mdname(mddev));
3223 module_put(mddev->pers->owner);
3225 mddev->private = priv;
3226 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
3227 mddev->level = mddev->new_level;
3228 mddev->layout = mddev->new_layout;
3229 mddev->chunk_sectors = mddev->new_chunk_sectors;
3230 mddev->delta_disks = 0;
3231 mddev->degraded = 0;
3232 if (mddev->pers->sync_request == NULL) {
3233 /* this is now an array without redundancy, so
3234 * it must always be in_sync
3237 del_timer_sync(&mddev->safemode_timer);
3240 mddev_resume(mddev);
3241 set_bit(MD_CHANGE_DEVS, &mddev->flags);
3242 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3243 md_wakeup_thread(mddev->thread);
3244 sysfs_notify(&mddev->kobj, NULL, "level");
3245 md_new_event(mddev);
3249 static struct md_sysfs_entry md_level =
3250 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
3254 layout_show(mddev_t *mddev, char *page)
3256 /* just a number, not meaningful for all levels */
3257 if (mddev->reshape_position != MaxSector &&
3258 mddev->layout != mddev->new_layout)
3259 return sprintf(page, "%d (%d)\n",
3260 mddev->new_layout, mddev->layout);
3261 return sprintf(page, "%d\n", mddev->layout);
3265 layout_store(mddev_t *mddev, const char *buf, size_t len)
3268 unsigned long n = simple_strtoul(buf, &e, 10);
3270 if (!*buf || (*e && *e != '\n'))
3275 if (mddev->pers->check_reshape == NULL)
3277 mddev->new_layout = n;
3278 err = mddev->pers->check_reshape(mddev);
3280 mddev->new_layout = mddev->layout;
3284 mddev->new_layout = n;
3285 if (mddev->reshape_position == MaxSector)
3290 static struct md_sysfs_entry md_layout =
3291 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
3295 raid_disks_show(mddev_t *mddev, char *page)
3297 if (mddev->raid_disks == 0)
3299 if (mddev->reshape_position != MaxSector &&
3300 mddev->delta_disks != 0)
3301 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
3302 mddev->raid_disks - mddev->delta_disks);
3303 return sprintf(page, "%d\n", mddev->raid_disks);
3306 static int update_raid_disks(mddev_t *mddev, int raid_disks);
3309 raid_disks_store(mddev_t *mddev, const char *buf, size_t len)
3313 unsigned long n = simple_strtoul(buf, &e, 10);
3315 if (!*buf || (*e && *e != '\n'))
3319 rv = update_raid_disks(mddev, n);
3320 else if (mddev->reshape_position != MaxSector) {
3321 int olddisks = mddev->raid_disks - mddev->delta_disks;
3322 mddev->delta_disks = n - olddisks;
3323 mddev->raid_disks = n;
3325 mddev->raid_disks = n;
3326 return rv ? rv : len;
3328 static struct md_sysfs_entry md_raid_disks =
3329 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
3332 chunk_size_show(mddev_t *mddev, char *page)
3334 if (mddev->reshape_position != MaxSector &&
3335 mddev->chunk_sectors != mddev->new_chunk_sectors)
3336 return sprintf(page, "%d (%d)\n",
3337 mddev->new_chunk_sectors << 9,
3338 mddev->chunk_sectors << 9);
3339 return sprintf(page, "%d\n", mddev->chunk_sectors << 9);
3343 chunk_size_store(mddev_t *mddev, const char *buf, size_t len)
3346 unsigned long n = simple_strtoul(buf, &e, 10);
3348 if (!*buf || (*e && *e != '\n'))
3353 if (mddev->pers->check_reshape == NULL)
3355 mddev->new_chunk_sectors = n >> 9;
3356 err = mddev->pers->check_reshape(mddev);
3358 mddev->new_chunk_sectors = mddev->chunk_sectors;
3362 mddev->new_chunk_sectors = n >> 9;
3363 if (mddev->reshape_position == MaxSector)
3364 mddev->chunk_sectors = n >> 9;
3368 static struct md_sysfs_entry md_chunk_size =
3369 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
3372 resync_start_show(mddev_t *mddev, char *page)
3374 if (mddev->recovery_cp == MaxSector)
3375 return sprintf(page, "none\n");
3376 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
3380 resync_start_store(mddev_t *mddev, const char *buf, size_t len)
3383 unsigned long long n = simple_strtoull(buf, &e, 10);
3385 if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
3387 if (cmd_match(buf, "none"))
3389 else if (!*buf || (*e && *e != '\n'))
3392 mddev->recovery_cp = n;
3395 static struct md_sysfs_entry md_resync_start =
3396 __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store);
3399 * The array state can be:
3402 * No devices, no size, no level
3403 * Equivalent to STOP_ARRAY ioctl
3405 * May have some settings, but array is not active
3406 * all IO results in error
3407 * When written, doesn't tear down array, but just stops it
3408 * suspended (not supported yet)
3409 * All IO requests will block. The array can be reconfigured.
3410 * Writing this, if accepted, will block until array is quiescent
3412 * no resync can happen. no superblocks get written.
3413 * write requests fail
3415 * like readonly, but behaves like 'clean' on a write request.
3417 * clean - no pending writes, but otherwise active.
3418 * When written to inactive array, starts without resync
3419 * If a write request arrives then
3420 * if metadata is known, mark 'dirty' and switch to 'active'.
3421 * if not known, block and switch to write-pending
3422 * If written to an active array that has pending writes, then fails.
3424 * fully active: IO and resync can be happening.
3425 * When written to inactive array, starts with resync
3428 * clean, but writes are blocked waiting for 'active' to be written.
3431 * like active, but no writes have been seen for a while (100msec).
3434 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
3435 write_pending, active_idle, bad_word};
3436 static char *array_states[] = {
3437 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3438 "write-pending", "active-idle", NULL };
3440 static int match_word(const char *word, char **list)
3443 for (n=0; list[n]; n++)
3444 if (cmd_match(word, list[n]))
3450 array_state_show(mddev_t *mddev, char *page)
3452 enum array_state st = inactive;
3465 else if (test_bit(MD_CHANGE_PENDING, &mddev->flags))
3467 else if (mddev->safemode)
3473 if (list_empty(&mddev->disks) &&
3474 mddev->raid_disks == 0 &&
3475 mddev->dev_sectors == 0)
3480 return sprintf(page, "%s\n", array_states[st]);
3483 static int do_md_stop(mddev_t * mddev, int ro, int is_open);
3484 static int md_set_readonly(mddev_t * mddev, int is_open);
3485 static int do_md_run(mddev_t * mddev);
3486 static int restart_array(mddev_t *mddev);
3489 array_state_store(mddev_t *mddev, const char *buf, size_t len)
3492 enum array_state st = match_word(buf, array_states);
3497 /* stopping an active array */
3498 if (atomic_read(&mddev->openers) > 0)
3500 err = do_md_stop(mddev, 0, 0);
3503 /* stopping an active array */
3505 if (atomic_read(&mddev->openers) > 0)
3507 err = do_md_stop(mddev, 2, 0);
3509 err = 0; /* already inactive */
3512 break; /* not supported yet */
3515 err = md_set_readonly(mddev, 0);
3518 set_disk_ro(mddev->gendisk, 1);
3519 err = do_md_run(mddev);
3525 err = md_set_readonly(mddev, 0);
3526 else if (mddev->ro == 1)
3527 err = restart_array(mddev);
3530 set_disk_ro(mddev->gendisk, 0);
3534 err = do_md_run(mddev);
3539 restart_array(mddev);
3540 spin_lock_irq(&mddev->write_lock);
3541 if (atomic_read(&mddev->writes_pending) == 0) {
3542 if (mddev->in_sync == 0) {
3544 if (mddev->safemode == 1)
3545 mddev->safemode = 0;
3546 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
3551 spin_unlock_irq(&mddev->write_lock);
3557 restart_array(mddev);
3558 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
3559 wake_up(&mddev->sb_wait);
3563 set_disk_ro(mddev->gendisk, 0);
3564 err = do_md_run(mddev);
3569 /* these cannot be set */
3575 sysfs_notify_dirent_safe(mddev->sysfs_state);
3579 static struct md_sysfs_entry md_array_state =
3580 __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
3583 max_corrected_read_errors_show(mddev_t *mddev, char *page) {
3584 return sprintf(page, "%d\n",
3585 atomic_read(&mddev->max_corr_read_errors));
3589 max_corrected_read_errors_store(mddev_t *mddev, const char *buf, size_t len)
3592 unsigned long n = simple_strtoul(buf, &e, 10);
3594 if (*buf && (*e == 0 || *e == '\n')) {
3595 atomic_set(&mddev->max_corr_read_errors, n);
3601 static struct md_sysfs_entry max_corr_read_errors =
3602 __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show,
3603 max_corrected_read_errors_store);
3606 null_show(mddev_t *mddev, char *page)
3612 new_dev_store(mddev_t *mddev, const char *buf, size_t len)
3614 /* buf must be %d:%d\n? giving major and minor numbers */
3615 /* The new device is added to the array.
3616 * If the array has a persistent superblock, we read the
3617 * superblock to initialise info and check validity.
3618 * Otherwise, only checking done is that in bind_rdev_to_array,
3619 * which mainly checks size.
3622 int major = simple_strtoul(buf, &e, 10);
3628 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
3630 minor = simple_strtoul(e+1, &e, 10);
3631 if (*e && *e != '\n')
3633 dev = MKDEV(major, minor);
3634 if (major != MAJOR(dev) ||
3635 minor != MINOR(dev))
3639 if (mddev->persistent) {
3640 rdev = md_import_device(dev, mddev->major_version,
3641 mddev->minor_version);
3642 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
3643 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
3644 mdk_rdev_t, same_set);
3645 err = super_types[mddev->major_version]
3646 .load_super(rdev, rdev0, mddev->minor_version);
3650 } else if (mddev->external)
3651 rdev = md_import_device(dev, -2, -1);
3653 rdev = md_import_device(dev, -1, -1);
3656 return PTR_ERR(rdev);
3657 err = bind_rdev_to_array(rdev, mddev);
3661 return err ? err : len;
3664 static struct md_sysfs_entry md_new_device =
3665 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
3668 bitmap_store(mddev_t *mddev, const char *buf, size_t len)
3671 unsigned long chunk, end_chunk;
3675 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
3677 chunk = end_chunk = simple_strtoul(buf, &end, 0);
3678 if (buf == end) break;
3679 if (*end == '-') { /* range */
3681 end_chunk = simple_strtoul(buf, &end, 0);
3682 if (buf == end) break;
3684 if (*end && !isspace(*end)) break;
3685 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
3686 buf = skip_spaces(end);
3688 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
3693 static struct md_sysfs_entry md_bitmap =
3694 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
3697 size_show(mddev_t *mddev, char *page)
3699 return sprintf(page, "%llu\n",
3700 (unsigned long long)mddev->dev_sectors / 2);
3703 static int update_size(mddev_t *mddev, sector_t num_sectors);
3706 size_store(mddev_t *mddev, const char *buf, size_t len)
3708 /* If array is inactive, we can reduce the component size, but
3709 * not increase it (except from 0).
3710 * If array is active, we can try an on-line resize
3713 int err = strict_blocks_to_sectors(buf, §ors);
3718 err = update_size(mddev, sectors);
3719 md_update_sb(mddev, 1);
3721 if (mddev->dev_sectors == 0 ||
3722 mddev->dev_sectors > sectors)
3723 mddev->dev_sectors = sectors;
3727 return err ? err : len;
3730 static struct md_sysfs_entry md_size =
3731 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
3736 * 'none' for arrays with no metadata (good luck...)
3737 * 'external' for arrays with externally managed metadata,
3738 * or N.M for internally known formats
3741 metadata_show(mddev_t *mddev, char *page)
3743 if (mddev->persistent)
3744 return sprintf(page, "%d.%d\n",
3745 mddev->major_version, mddev->minor_version);
3746 else if (mddev->external)
3747 return sprintf(page, "external:%s\n", mddev->metadata_type);
3749 return sprintf(page, "none\n");
3753 metadata_store(mddev_t *mddev, const char *buf, size_t len)
3757 /* Changing the details of 'external' metadata is
3758 * always permitted. Otherwise there must be
3759 * no devices attached to the array.
3761 if (mddev->external && strncmp(buf, "external:", 9) == 0)
3763 else if (!list_empty(&mddev->disks))
3766 if (cmd_match(buf, "none")) {
3767 mddev->persistent = 0;
3768 mddev->external = 0;
3769 mddev->major_version = 0;
3770 mddev->minor_version = 90;
3773 if (strncmp(buf, "external:", 9) == 0) {
3774 size_t namelen = len-9;
3775 if (namelen >= sizeof(mddev->metadata_type))
3776 namelen = sizeof(mddev->metadata_type)-1;
3777 strncpy(mddev->metadata_type, buf+9, namelen);
3778 mddev->metadata_type[namelen] = 0;
3779 if (namelen && mddev->metadata_type[namelen-1] == '\n')
3780 mddev->metadata_type[--namelen] = 0;
3781 mddev->persistent = 0;
3782 mddev->external = 1;
3783 mddev->major_version = 0;
3784 mddev->minor_version = 90;
3787 major = simple_strtoul(buf, &e, 10);
3788 if (e==buf || *e != '.')
3791 minor = simple_strtoul(buf, &e, 10);
3792 if (e==buf || (*e && *e != '\n') )
3794 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
3796 mddev->major_version = major;
3797 mddev->minor_version = minor;
3798 mddev->persistent = 1;
3799 mddev->external = 0;
3803 static struct md_sysfs_entry md_metadata =
3804 __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
3807 action_show(mddev_t *mddev, char *page)
3809 char *type = "idle";
3810 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
3812 else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3813 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) {
3814 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
3816 else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
3817 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
3819 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
3823 } else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
3826 return sprintf(page, "%s\n", type);
3829 static void reap_sync_thread(mddev_t *mddev);
3832 action_store(mddev_t *mddev, const char *page, size_t len)
3834 if (!mddev->pers || !mddev->pers->sync_request)
3837 if (cmd_match(page, "frozen"))
3838 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3840 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3842 if (cmd_match(page, "idle") || cmd_match(page, "frozen")) {
3843 if (mddev->sync_thread) {
3844 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
3845 reap_sync_thread(mddev);
3847 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3848 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
3850 else if (cmd_match(page, "resync"))
3851 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3852 else if (cmd_match(page, "recover")) {
3853 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
3854 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3855 } else if (cmd_match(page, "reshape")) {
3857 if (mddev->pers->start_reshape == NULL)
3859 err = mddev->pers->start_reshape(mddev);
3862 sysfs_notify(&mddev->kobj, NULL, "degraded");
3864 if (cmd_match(page, "check"))
3865 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
3866 else if (!cmd_match(page, "repair"))
3868 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
3869 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
3871 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3872 md_wakeup_thread(mddev->thread);
3873 sysfs_notify_dirent_safe(mddev->sysfs_action);
3878 mismatch_cnt_show(mddev_t *mddev, char *page)
3880 return sprintf(page, "%llu\n",
3881 (unsigned long long) mddev->resync_mismatches);
3884 static struct md_sysfs_entry md_scan_mode =
3885 __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
3888 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
3891 sync_min_show(mddev_t *mddev, char *page)
3893 return sprintf(page, "%d (%s)\n", speed_min(mddev),
3894 mddev->sync_speed_min ? "local": "system");
3898 sync_min_store(mddev_t *mddev, const char *buf, size_t len)
3902 if (strncmp(buf, "system", 6)==0) {
3903 mddev->sync_speed_min = 0;
3906 min = simple_strtoul(buf, &e, 10);
3907 if (buf == e || (*e && *e != '\n') || min <= 0)
3909 mddev->sync_speed_min = min;
3913 static struct md_sysfs_entry md_sync_min =
3914 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
3917 sync_max_show(mddev_t *mddev, char *page)
3919 return sprintf(page, "%d (%s)\n", speed_max(mddev),
3920 mddev->sync_speed_max ? "local": "system");
3924 sync_max_store(mddev_t *mddev, const char *buf, size_t len)
3928 if (strncmp(buf, "system", 6)==0) {
3929 mddev->sync_speed_max = 0;
3932 max = simple_strtoul(buf, &e, 10);
3933 if (buf == e || (*e && *e != '\n') || max <= 0)
3935 mddev->sync_speed_max = max;
3939 static struct md_sysfs_entry md_sync_max =
3940 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
3943 degraded_show(mddev_t *mddev, char *page)
3945 return sprintf(page, "%d\n", mddev->degraded);
3947 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
3950 sync_force_parallel_show(mddev_t *mddev, char *page)
3952 return sprintf(page, "%d\n", mddev->parallel_resync);
3956 sync_force_parallel_store(mddev_t *mddev, const char *buf, size_t len)
3960 if (strict_strtol(buf, 10, &n))
3963 if (n != 0 && n != 1)
3966 mddev->parallel_resync = n;
3968 if (mddev->sync_thread)
3969 wake_up(&resync_wait);
3974 /* force parallel resync, even with shared block devices */
3975 static struct md_sysfs_entry md_sync_force_parallel =
3976 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
3977 sync_force_parallel_show, sync_force_parallel_store);
3980 sync_speed_show(mddev_t *mddev, char *page)
3982 unsigned long resync, dt, db;
3983 if (mddev->curr_resync == 0)
3984 return sprintf(page, "none\n");
3985 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
3986 dt = (jiffies - mddev->resync_mark) / HZ;
3988 db = resync - mddev->resync_mark_cnt;
3989 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
3992 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
3995 sync_completed_show(mddev_t *mddev, char *page)
3997 unsigned long long max_sectors, resync;
3999 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4000 return sprintf(page, "none\n");
4002 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
4003 max_sectors = mddev->resync_max_sectors;
4005 max_sectors = mddev->dev_sectors;
4007 resync = mddev->curr_resync_completed;
4008 return sprintf(page, "%llu / %llu\n", resync, max_sectors);
4011 static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed);
4014 min_sync_show(mddev_t *mddev, char *page)
4016 return sprintf(page, "%llu\n",
4017 (unsigned long long)mddev->resync_min);
4020 min_sync_store(mddev_t *mddev, const char *buf, size_t len)
4022 unsigned long long min;
4023 if (strict_strtoull(buf, 10, &min))
4025 if (min > mddev->resync_max)
4027 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4030 /* Must be a multiple of chunk_size */
4031 if (mddev->chunk_sectors) {
4032 sector_t temp = min;
4033 if (sector_div(temp, mddev->chunk_sectors))
4036 mddev->resync_min = min;
4041 static struct md_sysfs_entry md_min_sync =
4042 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
4045 max_sync_show(mddev_t *mddev, char *page)
4047 if (mddev->resync_max == MaxSector)
4048 return sprintf(page, "max\n");
4050 return sprintf(page, "%llu\n",
4051 (unsigned long long)mddev->resync_max);
4054 max_sync_store(mddev_t *mddev, const char *buf, size_t len)
4056 if (strncmp(buf, "max", 3) == 0)
4057 mddev->resync_max = MaxSector;
4059 unsigned long long max;
4060 if (strict_strtoull(buf, 10, &max))
4062 if (max < mddev->resync_min)
4064 if (max < mddev->resync_max &&
4066 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4069 /* Must be a multiple of chunk_size */
4070 if (mddev->chunk_sectors) {
4071 sector_t temp = max;
4072 if (sector_div(temp, mddev->chunk_sectors))
4075 mddev->resync_max = max;
4077 wake_up(&mddev->recovery_wait);
4081 static struct md_sysfs_entry md_max_sync =
4082 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
4085 suspend_lo_show(mddev_t *mddev, char *page)
4087 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
4091 suspend_lo_store(mddev_t *mddev, const char *buf, size_t len)
4094 unsigned long long new = simple_strtoull(buf, &e, 10);
4095 unsigned long long old = mddev->suspend_lo;
4097 if (mddev->pers == NULL ||
4098 mddev->pers->quiesce == NULL)
4100 if (buf == e || (*e && *e != '\n'))
4103 mddev->suspend_lo = new;
4105 /* Shrinking suspended region */
4106 mddev->pers->quiesce(mddev, 2);
4108 /* Expanding suspended region - need to wait */
4109 mddev->pers->quiesce(mddev, 1);
4110 mddev->pers->quiesce(mddev, 0);
4114 static struct md_sysfs_entry md_suspend_lo =
4115 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
4119 suspend_hi_show(mddev_t *mddev, char *page)
4121 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
4125 suspend_hi_store(mddev_t *mddev, const char *buf, size_t len)
4128 unsigned long long new = simple_strtoull(buf, &e, 10);
4129 unsigned long long old = mddev->suspend_hi;
4131 if (mddev->pers == NULL ||
4132 mddev->pers->quiesce == NULL)
4134 if (buf == e || (*e && *e != '\n'))
4137 mddev->suspend_hi = new;
4139 /* Shrinking suspended region */
4140 mddev->pers->quiesce(mddev, 2);
4142 /* Expanding suspended region - need to wait */
4143 mddev->pers->quiesce(mddev, 1);
4144 mddev->pers->quiesce(mddev, 0);
4148 static struct md_sysfs_entry md_suspend_hi =
4149 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
4152 reshape_position_show(mddev_t *mddev, char *page)
4154 if (mddev->reshape_position != MaxSector)
4155 return sprintf(page, "%llu\n",
4156 (unsigned long long)mddev->reshape_position);
4157 strcpy(page, "none\n");
4162 reshape_position_store(mddev_t *mddev, const char *buf, size_t len)
4165 unsigned long long new = simple_strtoull(buf, &e, 10);
4168 if (buf == e || (*e && *e != '\n'))
4170 mddev->reshape_position = new;
4171 mddev->delta_disks = 0;
4172 mddev->new_level = mddev->level;
4173 mddev->new_layout = mddev->layout;
4174 mddev->new_chunk_sectors = mddev->chunk_sectors;
4178 static struct md_sysfs_entry md_reshape_position =
4179 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
4180 reshape_position_store);
4183 array_size_show(mddev_t *mddev, char *page)
4185 if (mddev->external_size)
4186 return sprintf(page, "%llu\n",
4187 (unsigned long long)mddev->array_sectors/2);
4189 return sprintf(page, "default\n");
4193 array_size_store(mddev_t *mddev, const char *buf, size_t len)
4197 if (strncmp(buf, "default", 7) == 0) {
4199 sectors = mddev->pers->size(mddev, 0, 0);
4201 sectors = mddev->array_sectors;
4203 mddev->external_size = 0;
4205 if (strict_blocks_to_sectors(buf, §ors) < 0)
4207 if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors)
4210 mddev->external_size = 1;
4213 mddev->array_sectors = sectors;
4215 set_capacity(mddev->gendisk, mddev->array_sectors);
4216 revalidate_disk(mddev->gendisk);
4221 static struct md_sysfs_entry md_array_size =
4222 __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show,
4225 static struct attribute *md_default_attrs[] = {
4228 &md_raid_disks.attr,
4229 &md_chunk_size.attr,
4231 &md_resync_start.attr,
4233 &md_new_device.attr,
4234 &md_safe_delay.attr,
4235 &md_array_state.attr,
4236 &md_reshape_position.attr,
4237 &md_array_size.attr,
4238 &max_corr_read_errors.attr,
4242 static struct attribute *md_redundancy_attrs[] = {
4244 &md_mismatches.attr,
4247 &md_sync_speed.attr,
4248 &md_sync_force_parallel.attr,
4249 &md_sync_completed.attr,
4252 &md_suspend_lo.attr,
4253 &md_suspend_hi.attr,
4258 static struct attribute_group md_redundancy_group = {
4260 .attrs = md_redundancy_attrs,
4265 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
4267 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
4268 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
4273 rv = mddev_lock(mddev);
4275 rv = entry->show(mddev, page);
4276 mddev_unlock(mddev);
4282 md_attr_store(struct kobject *kobj, struct attribute *attr,
4283 const char *page, size_t length)
4285 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
4286 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
4291 if (!capable(CAP_SYS_ADMIN))
4293 rv = mddev_lock(mddev);
4294 if (mddev->hold_active == UNTIL_IOCTL)
4295 mddev->hold_active = 0;
4297 rv = entry->store(mddev, page, length);
4298 mddev_unlock(mddev);
4303 static void md_free(struct kobject *ko)
4305 mddev_t *mddev = container_of(ko, mddev_t, kobj);
4307 if (mddev->sysfs_state)
4308 sysfs_put(mddev->sysfs_state);
4310 if (mddev->gendisk) {
4311 del_gendisk(mddev->gendisk);
4312 put_disk(mddev->gendisk);
4315 blk_cleanup_queue(mddev->queue);
4320 static const struct sysfs_ops md_sysfs_ops = {
4321 .show = md_attr_show,
4322 .store = md_attr_store,
4324 static struct kobj_type md_ktype = {
4326 .sysfs_ops = &md_sysfs_ops,
4327 .default_attrs = md_default_attrs,
4332 static void mddev_delayed_delete(struct work_struct *ws)
4334 mddev_t *mddev = container_of(ws, mddev_t, del_work);
4336 sysfs_remove_group(&mddev->kobj, &md_bitmap_group);
4337 kobject_del(&mddev->kobj);
4338 kobject_put(&mddev->kobj);
4341 static int md_alloc(dev_t dev, char *name)
4343 static DEFINE_MUTEX(disks_mutex);
4344 mddev_t *mddev = mddev_find(dev);
4345 struct gendisk *disk;
4354 partitioned = (MAJOR(mddev->unit) != MD_MAJOR);
4355 shift = partitioned ? MdpMinorShift : 0;
4356 unit = MINOR(mddev->unit) >> shift;
4358 /* wait for any previous instance of this device to be
4359 * completely removed (mddev_delayed_delete).
4361 flush_workqueue(md_misc_wq);
4363 mutex_lock(&disks_mutex);
4369 /* Need to ensure that 'name' is not a duplicate.
4372 spin_lock(&all_mddevs_lock);
4374 list_for_each_entry(mddev2, &all_mddevs, all_mddevs)
4375 if (mddev2->gendisk &&
4376 strcmp(mddev2->gendisk->disk_name, name) == 0) {
4377 spin_unlock(&all_mddevs_lock);
4380 spin_unlock(&all_mddevs_lock);
4384 mddev->queue = blk_alloc_queue(GFP_KERNEL);
4387 mddev->queue->queuedata = mddev;
4389 blk_queue_make_request(mddev->queue, md_make_request);
4391 disk = alloc_disk(1 << shift);
4393 blk_cleanup_queue(mddev->queue);
4394 mddev->queue = NULL;
4397 disk->major = MAJOR(mddev->unit);
4398 disk->first_minor = unit << shift;
4400 strcpy(disk->disk_name, name);
4401 else if (partitioned)
4402 sprintf(disk->disk_name, "md_d%d", unit);
4404 sprintf(disk->disk_name, "md%d", unit);
4405 disk->fops = &md_fops;
4406 disk->private_data = mddev;
4407 disk->queue = mddev->queue;
4408 blk_queue_flush(mddev->queue, REQ_FLUSH | REQ_FUA);
4409 /* Allow extended partitions. This makes the
4410 * 'mdp' device redundant, but we can't really
4413 disk->flags |= GENHD_FL_EXT_DEVT;
4414 mddev->gendisk = disk;
4415 /* As soon as we call add_disk(), another thread could get
4416 * through to md_open, so make sure it doesn't get too far
4418 mutex_lock(&mddev->open_mutex);
4421 error = kobject_init_and_add(&mddev->kobj, &md_ktype,
4422 &disk_to_dev(disk)->kobj, "%s", "md");
4424 /* This isn't possible, but as kobject_init_and_add is marked
4425 * __must_check, we must do something with the result
4427 printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
4431 if (mddev->kobj.sd &&
4432 sysfs_create_group(&mddev->kobj, &md_bitmap_group))
4433 printk(KERN_DEBUG "pointless warning\n");
4434 mutex_unlock(&mddev->open_mutex);
4436 mutex_unlock(&disks_mutex);
4437 if (!error && mddev->kobj.sd) {
4438 kobject_uevent(&mddev->kobj, KOBJ_ADD);
4439 mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state");
4445 static struct kobject *md_probe(dev_t dev, int *part, void *data)
4447 md_alloc(dev, NULL);
4451 static int add_named_array(const char *val, struct kernel_param *kp)
4453 /* val must be "md_*" where * is not all digits.
4454 * We allocate an array with a large free minor number, and
4455 * set the name to val. val must not already be an active name.
4457 int len = strlen(val);
4458 char buf[DISK_NAME_LEN];
4460 while (len && val[len-1] == '\n')
4462 if (len >= DISK_NAME_LEN)
4464 strlcpy(buf, val, len+1);
4465 if (strncmp(buf, "md_", 3) != 0)
4467 return md_alloc(0, buf);
4470 static void md_safemode_timeout(unsigned long data)
4472 mddev_t *mddev = (mddev_t *) data;
4474 if (!atomic_read(&mddev->writes_pending)) {
4475 mddev->safemode = 1;
4476 if (mddev->external)
4477 sysfs_notify_dirent_safe(mddev->sysfs_state);
4479 md_wakeup_thread(mddev->thread);
4482 static int start_dirty_degraded;
4484 int md_run(mddev_t *mddev)
4488 struct mdk_personality *pers;
4490 if (list_empty(&mddev->disks))
4491 /* cannot run an array with no devices.. */
4496 /* Cannot run until previous stop completes properly */
4497 if (mddev->sysfs_active)
4501 * Analyze all RAID superblock(s)
4503 if (!mddev->raid_disks) {
4504 if (!mddev->persistent)
4509 if (mddev->level != LEVEL_NONE)
4510 request_module("md-level-%d", mddev->level);
4511 else if (mddev->clevel[0])
4512 request_module("md-%s", mddev->clevel);
4515 * Drop all container device buffers, from now on
4516 * the only valid external interface is through the md
4519 list_for_each_entry(rdev, &mddev->disks, same_set) {
4520 if (test_bit(Faulty, &rdev->flags))
4522 sync_blockdev(rdev->bdev);
4523 invalidate_bdev(rdev->bdev);
4525 /* perform some consistency tests on the device.
4526 * We don't want the data to overlap the metadata,
4527 * Internal Bitmap issues have been handled elsewhere.
4529 if (rdev->meta_bdev) {
4530 /* Nothing to check */;
4531 } else if (rdev->data_offset < rdev->sb_start) {
4532 if (mddev->dev_sectors &&
4533 rdev->data_offset + mddev->dev_sectors
4535 printk("md: %s: data overlaps metadata\n",
4540 if (rdev->sb_start + rdev->sb_size/512
4541 > rdev->data_offset) {
4542 printk("md: %s: metadata overlaps data\n",
4547 sysfs_notify_dirent_safe(rdev->sysfs_state);
4550 if (mddev->bio_set == NULL)
4551 mddev->bio_set = bioset_create(BIO_POOL_SIZE,
4554 spin_lock(&pers_lock);
4555 pers = find_pers(mddev->level, mddev->clevel);
4556 if (!pers || !try_module_get(pers->owner)) {
4557 spin_unlock(&pers_lock);
4558 if (mddev->level != LEVEL_NONE)
4559 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
4562 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
4567 spin_unlock(&pers_lock);
4568 if (mddev->level != pers->level) {
4569 mddev->level = pers->level;
4570 mddev->new_level = pers->level;
4572 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
4574 if (mddev->reshape_position != MaxSector &&
4575 pers->start_reshape == NULL) {
4576 /* This personality cannot handle reshaping... */
4578 module_put(pers->owner);
4582 if (pers->sync_request) {
4583 /* Warn if this is a potentially silly
4586 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
4590 list_for_each_entry(rdev, &mddev->disks, same_set)
4591 list_for_each_entry(rdev2, &mddev->disks, same_set) {
4593 rdev->bdev->bd_contains ==
4594 rdev2->bdev->bd_contains) {
4596 "%s: WARNING: %s appears to be"
4597 " on the same physical disk as"
4600 bdevname(rdev->bdev,b),
4601 bdevname(rdev2->bdev,b2));
4608 "True protection against single-disk"
4609 " failure might be compromised.\n");
4612 mddev->recovery = 0;
4613 /* may be over-ridden by personality */
4614 mddev->resync_max_sectors = mddev->dev_sectors;
4616 mddev->ok_start_degraded = start_dirty_degraded;
4618 if (start_readonly && mddev->ro == 0)
4619 mddev->ro = 2; /* read-only, but switch on first write */
4621 err = mddev->pers->run(mddev);
4623 printk(KERN_ERR "md: pers->run() failed ...\n");
4624 else if (mddev->pers->size(mddev, 0, 0) < mddev->array_sectors) {
4625 WARN_ONCE(!mddev->external_size, "%s: default size too small,"
4626 " but 'external_size' not in effect?\n", __func__);
4628 "md: invalid array_size %llu > default size %llu\n",
4629 (unsigned long long)mddev->array_sectors / 2,
4630 (unsigned long long)mddev->pers->size(mddev, 0, 0) / 2);
4632 mddev->pers->stop(mddev);
4634 if (err == 0 && mddev->pers->sync_request) {
4635 err = bitmap_create(mddev);
4637 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
4638 mdname(mddev), err);
4639 mddev->pers->stop(mddev);
4643 module_put(mddev->pers->owner);
4645 bitmap_destroy(mddev);
4648 if (mddev->pers->sync_request) {
4649 if (mddev->kobj.sd &&
4650 sysfs_create_group(&mddev->kobj, &md_redundancy_group))
4652 "md: cannot register extra attributes for %s\n",
4654 mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action");
4655 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
4658 atomic_set(&mddev->writes_pending,0);
4659 atomic_set(&mddev->max_corr_read_errors,
4660 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS);
4661 mddev->safemode = 0;
4662 mddev->safemode_timer.function = md_safemode_timeout;
4663 mddev->safemode_timer.data = (unsigned long) mddev;
4664 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
4668 list_for_each_entry(rdev, &mddev->disks, same_set)
4669 if (rdev->raid_disk >= 0)
4670 if (sysfs_link_rdev(mddev, rdev))
4671 /* failure here is OK */;
4673 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4676 md_update_sb(mddev, 0);
4678 md_new_event(mddev);
4679 sysfs_notify_dirent_safe(mddev->sysfs_state);
4680 sysfs_notify_dirent_safe(mddev->sysfs_action);
4681 sysfs_notify(&mddev->kobj, NULL, "degraded");
4684 EXPORT_SYMBOL_GPL(md_run);
4686 static int do_md_run(mddev_t *mddev)
4690 err = md_run(mddev);
4693 err = bitmap_load(mddev);
4695 bitmap_destroy(mddev);
4699 md_wakeup_thread(mddev->thread);
4700 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
4702 set_capacity(mddev->gendisk, mddev->array_sectors);
4703 revalidate_disk(mddev->gendisk);
4705 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
4710 static int restart_array(mddev_t *mddev)
4712 struct gendisk *disk = mddev->gendisk;
4714 /* Complain if it has no devices */
4715 if (list_empty(&mddev->disks))
4721 mddev->safemode = 0;
4723 set_disk_ro(disk, 0);
4724 printk(KERN_INFO "md: %s switched to read-write mode.\n",
4726 /* Kick recovery or resync if necessary */
4727 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4728 md_wakeup_thread(mddev->thread);
4729 md_wakeup_thread(mddev->sync_thread);
4730 sysfs_notify_dirent_safe(mddev->sysfs_state);
4734 /* similar to deny_write_access, but accounts for our holding a reference
4735 * to the file ourselves */
4736 static int deny_bitmap_write_access(struct file * file)
4738 struct inode *inode = file->f_mapping->host;
4740 spin_lock(&inode->i_lock);
4741 if (atomic_read(&inode->i_writecount) > 1) {
4742 spin_unlock(&inode->i_lock);
4745 atomic_set(&inode->i_writecount, -1);
4746 spin_unlock(&inode->i_lock);
4751 void restore_bitmap_write_access(struct file *file)
4753 struct inode *inode = file->f_mapping->host;
4755 spin_lock(&inode->i_lock);
4756 atomic_set(&inode->i_writecount, 1);
4757 spin_unlock(&inode->i_lock);
4760 static void md_clean(mddev_t *mddev)
4762 mddev->array_sectors = 0;
4763 mddev->external_size = 0;
4764 mddev->dev_sectors = 0;
4765 mddev->raid_disks = 0;
4766 mddev->recovery_cp = 0;
4767 mddev->resync_min = 0;
4768 mddev->resync_max = MaxSector;
4769 mddev->reshape_position = MaxSector;
4770 mddev->external = 0;
4771 mddev->persistent = 0;
4772 mddev->level = LEVEL_NONE;
4773 mddev->clevel[0] = 0;
4776 mddev->metadata_type[0] = 0;
4777 mddev->chunk_sectors = 0;
4778 mddev->ctime = mddev->utime = 0;
4780 mddev->max_disks = 0;
4782 mddev->can_decrease_events = 0;
4783 mddev->delta_disks = 0;
4784 mddev->new_level = LEVEL_NONE;
4785 mddev->new_layout = 0;
4786 mddev->new_chunk_sectors = 0;
4787 mddev->curr_resync = 0;
4788 mddev->resync_mismatches = 0;
4789 mddev->suspend_lo = mddev->suspend_hi = 0;
4790 mddev->sync_speed_min = mddev->sync_speed_max = 0;
4791 mddev->recovery = 0;
4794 mddev->degraded = 0;
4795 mddev->safemode = 0;
4796 mddev->bitmap_info.offset = 0;
4797 mddev->bitmap_info.default_offset = 0;
4798 mddev->bitmap_info.chunksize = 0;
4799 mddev->bitmap_info.daemon_sleep = 0;
4800 mddev->bitmap_info.max_write_behind = 0;
4803 static void __md_stop_writes(mddev_t *mddev)
4805 if (mddev->sync_thread) {
4806 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4807 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4808 reap_sync_thread(mddev);
4811 del_timer_sync(&mddev->safemode_timer);
4813 bitmap_flush(mddev);
4814 md_super_wait(mddev);
4816 if (!mddev->in_sync || mddev->flags) {
4817 /* mark array as shutdown cleanly */
4819 md_update_sb(mddev, 1);
4823 void md_stop_writes(mddev_t *mddev)
4826 __md_stop_writes(mddev);
4827 mddev_unlock(mddev);
4829 EXPORT_SYMBOL_GPL(md_stop_writes);
4831 void md_stop(mddev_t *mddev)
4834 mddev->pers->stop(mddev);
4835 if (mddev->pers->sync_request && mddev->to_remove == NULL)
4836 mddev->to_remove = &md_redundancy_group;
4837 module_put(mddev->pers->owner);
4839 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4841 EXPORT_SYMBOL_GPL(md_stop);
4843 static int md_set_readonly(mddev_t *mddev, int is_open)
4846 mutex_lock(&mddev->open_mutex);
4847 if (atomic_read(&mddev->openers) > is_open) {
4848 printk("md: %s still in use.\n",mdname(mddev));
4853 __md_stop_writes(mddev);
4859 set_disk_ro(mddev->gendisk, 1);
4860 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4861 sysfs_notify_dirent_safe(mddev->sysfs_state);
4865 mutex_unlock(&mddev->open_mutex);
4870 * 0 - completely stop and dis-assemble array
4871 * 2 - stop but do not disassemble array
4873 static int do_md_stop(mddev_t * mddev, int mode, int is_open)
4875 struct gendisk *disk = mddev->gendisk;
4878 mutex_lock(&mddev->open_mutex);
4879 if (atomic_read(&mddev->openers) > is_open ||
4880 mddev->sysfs_active) {
4881 printk("md: %s still in use.\n",mdname(mddev));
4882 mutex_unlock(&mddev->open_mutex);
4888 set_disk_ro(disk, 0);
4890 __md_stop_writes(mddev);
4892 mddev->queue->merge_bvec_fn = NULL;
4893 mddev->queue->backing_dev_info.congested_fn = NULL;
4895 /* tell userspace to handle 'inactive' */
4896 sysfs_notify_dirent_safe(mddev->sysfs_state);
4898 list_for_each_entry(rdev, &mddev->disks, same_set)
4899 if (rdev->raid_disk >= 0)
4900 sysfs_unlink_rdev(mddev, rdev);
4902 set_capacity(disk, 0);
4903 mutex_unlock(&mddev->open_mutex);
4905 revalidate_disk(disk);
4910 mutex_unlock(&mddev->open_mutex);
4912 * Free resources if final stop
4915 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
4917 bitmap_destroy(mddev);
4918 if (mddev->bitmap_info.file) {
4919 restore_bitmap_write_access(mddev->bitmap_info.file);
4920 fput(mddev->bitmap_info.file);
4921 mddev->bitmap_info.file = NULL;
4923 mddev->bitmap_info.offset = 0;
4925 export_array(mddev);
4928 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
4929 if (mddev->hold_active == UNTIL_STOP)
4930 mddev->hold_active = 0;
4932 blk_integrity_unregister(disk);
4933 md_new_event(mddev);
4934 sysfs_notify_dirent_safe(mddev->sysfs_state);
4939 static void autorun_array(mddev_t *mddev)
4944 if (list_empty(&mddev->disks))
4947 printk(KERN_INFO "md: running: ");
4949 list_for_each_entry(rdev, &mddev->disks, same_set) {
4950 char b[BDEVNAME_SIZE];
4951 printk("<%s>", bdevname(rdev->bdev,b));
4955 err = do_md_run(mddev);
4957 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
4958 do_md_stop(mddev, 0, 0);
4963 * lets try to run arrays based on all disks that have arrived
4964 * until now. (those are in pending_raid_disks)
4966 * the method: pick the first pending disk, collect all disks with
4967 * the same UUID, remove all from the pending list and put them into
4968 * the 'same_array' list. Then order this list based on superblock
4969 * update time (freshest comes first), kick out 'old' disks and
4970 * compare superblocks. If everything's fine then run it.
4972 * If "unit" is allocated, then bump its reference count
4974 static void autorun_devices(int part)
4976 mdk_rdev_t *rdev0, *rdev, *tmp;
4978 char b[BDEVNAME_SIZE];
4980 printk(KERN_INFO "md: autorun ...\n");
4981 while (!list_empty(&pending_raid_disks)) {
4984 LIST_HEAD(candidates);
4985 rdev0 = list_entry(pending_raid_disks.next,
4986 mdk_rdev_t, same_set);
4988 printk(KERN_INFO "md: considering %s ...\n",
4989 bdevname(rdev0->bdev,b));
4990 INIT_LIST_HEAD(&candidates);
4991 rdev_for_each_list(rdev, tmp, &pending_raid_disks)
4992 if (super_90_load(rdev, rdev0, 0) >= 0) {
4993 printk(KERN_INFO "md: adding %s ...\n",
4994 bdevname(rdev->bdev,b));
4995 list_move(&rdev->same_set, &candidates);
4998 * now we have a set of devices, with all of them having
4999 * mostly sane superblocks. It's time to allocate the
5003 dev = MKDEV(mdp_major,
5004 rdev0->preferred_minor << MdpMinorShift);
5005 unit = MINOR(dev) >> MdpMinorShift;
5007 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
5010 if (rdev0->preferred_minor != unit) {
5011 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
5012 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
5016 md_probe(dev, NULL, NULL);
5017 mddev = mddev_find(dev);
5018 if (!mddev || !mddev->gendisk) {
5022 "md: cannot allocate memory for md drive.\n");
5025 if (mddev_lock(mddev))
5026 printk(KERN_WARNING "md: %s locked, cannot run\n",
5028 else if (mddev->raid_disks || mddev->major_version
5029 || !list_empty(&mddev->disks)) {
5031 "md: %s already running, cannot run %s\n",
5032 mdname(mddev), bdevname(rdev0->bdev,b));
5033 mddev_unlock(mddev);
5035 printk(KERN_INFO "md: created %s\n", mdname(mddev));
5036 mddev->persistent = 1;
5037 rdev_for_each_list(rdev, tmp, &candidates) {
5038 list_del_init(&rdev->same_set);
5039 if (bind_rdev_to_array(rdev, mddev))
5042 autorun_array(mddev);
5043 mddev_unlock(mddev);
5045 /* on success, candidates will be empty, on error
5048 rdev_for_each_list(rdev, tmp, &candidates) {
5049 list_del_init(&rdev->same_set);
5054 printk(KERN_INFO "md: ... autorun DONE.\n");
5056 #endif /* !MODULE */
5058 static int get_version(void __user * arg)
5062 ver.major = MD_MAJOR_VERSION;
5063 ver.minor = MD_MINOR_VERSION;
5064 ver.patchlevel = MD_PATCHLEVEL_VERSION;
5066 if (copy_to_user(arg, &ver, sizeof(ver)))
5072 static int get_array_info(mddev_t * mddev, void __user * arg)
5074 mdu_array_info_t info;
5075 int nr,working,insync,failed,spare;
5078 nr=working=insync=failed=spare=0;
5079 list_for_each_entry(rdev, &mddev->disks, same_set) {
5081 if (test_bit(Faulty, &rdev->flags))
5085 if (test_bit(In_sync, &rdev->flags))
5092 info.major_version = mddev->major_version;
5093 info.minor_version = mddev->minor_version;
5094 info.patch_version = MD_PATCHLEVEL_VERSION;
5095 info.ctime = mddev->ctime;
5096 info.level = mddev->level;
5097 info.size = mddev->dev_sectors / 2;
5098 if (info.size != mddev->dev_sectors / 2) /* overflow */
5101 info.raid_disks = mddev->raid_disks;
5102 info.md_minor = mddev->md_minor;
5103 info.not_persistent= !mddev->persistent;
5105 info.utime = mddev->utime;
5108 info.state = (1<<MD_SB_CLEAN);
5109 if (mddev->bitmap && mddev->bitmap_info.offset)
5110 info.state = (1<<MD_SB_BITMAP_PRESENT);
5111 info.active_disks = insync;
5112 info.working_disks = working;
5113 info.failed_disks = failed;
5114 info.spare_disks = spare;
5116 info.layout = mddev->layout;
5117 info.chunk_size = mddev->chunk_sectors << 9;
5119 if (copy_to_user(arg, &info, sizeof(info)))
5125 static int get_bitmap_file(mddev_t * mddev, void __user * arg)
5127 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
5128 char *ptr, *buf = NULL;
5131 if (md_allow_write(mddev))
5132 file = kmalloc(sizeof(*file), GFP_NOIO);
5134 file = kmalloc(sizeof(*file), GFP_KERNEL);
5139 /* bitmap disabled, zero the first byte and copy out */
5140 if (!mddev->bitmap || !mddev->bitmap->file) {
5141 file->pathname[0] = '\0';
5145 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
5149 ptr = d_path(&mddev->bitmap->file->f_path, buf, sizeof(file->pathname));
5153 strcpy(file->pathname, ptr);
5157 if (copy_to_user(arg, file, sizeof(*file)))
5165 static int get_disk_info(mddev_t * mddev, void __user * arg)
5167 mdu_disk_info_t info;
5170 if (copy_from_user(&info, arg, sizeof(info)))
5173 rdev = find_rdev_nr(mddev, info.number);
5175 info.major = MAJOR(rdev->bdev->bd_dev);
5176 info.minor = MINOR(rdev->bdev->bd_dev);
5177 info.raid_disk = rdev->raid_disk;
5179 if (test_bit(Faulty, &rdev->flags))
5180 info.state |= (1<<MD_DISK_FAULTY);
5181 else if (test_bit(In_sync, &rdev->flags)) {
5182 info.state |= (1<<MD_DISK_ACTIVE);
5183 info.state |= (1<<MD_DISK_SYNC);
5185 if (test_bit(WriteMostly, &rdev->flags))
5186 info.state |= (1<<MD_DISK_WRITEMOSTLY);
5188 info.major = info.minor = 0;
5189 info.raid_disk = -1;
5190 info.state = (1<<MD_DISK_REMOVED);
5193 if (copy_to_user(arg, &info, sizeof(info)))
5199 static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
5201 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
5203 dev_t dev = MKDEV(info->major,info->minor);
5205 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
5208 if (!mddev->raid_disks) {
5210 /* expecting a device which has a superblock */
5211 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
5214 "md: md_import_device returned %ld\n",
5216 return PTR_ERR(rdev);
5218 if (!list_empty(&mddev->disks)) {
5219 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
5220 mdk_rdev_t, same_set);
5221 err = super_types[mddev->major_version]
5222 .load_super(rdev, rdev0, mddev->minor_version);
5225 "md: %s has different UUID to %s\n",
5226 bdevname(rdev->bdev,b),
5227 bdevname(rdev0->bdev,b2));
5232 err = bind_rdev_to_array(rdev, mddev);
5239 * add_new_disk can be used once the array is assembled
5240 * to add "hot spares". They must already have a superblock
5245 if (!mddev->pers->hot_add_disk) {
5247 "%s: personality does not support diskops!\n",
5251 if (mddev->persistent)
5252 rdev = md_import_device(dev, mddev->major_version,
5253 mddev->minor_version);
5255 rdev = md_import_device(dev, -1, -1);
5258 "md: md_import_device returned %ld\n",
5260 return PTR_ERR(rdev);
5262 /* set saved_raid_disk if appropriate */
5263 if (!mddev->persistent) {
5264 if (info->state & (1<<MD_DISK_SYNC) &&
5265 info->raid_disk < mddev->raid_disks) {
5266 rdev->raid_disk = info->raid_disk;
5267 set_bit(In_sync, &rdev->flags);
5269 rdev->raid_disk = -1;
5271 super_types[mddev->major_version].
5272 validate_super(mddev, rdev);
5273 if ((info->state & (1<<MD_DISK_SYNC)) &&
5274 (!test_bit(In_sync, &rdev->flags) ||
5275 rdev->raid_disk != info->raid_disk)) {
5276 /* This was a hot-add request, but events doesn't
5277 * match, so reject it.
5283 if (test_bit(In_sync, &rdev->flags))
5284 rdev->saved_raid_disk = rdev->raid_disk;
5286 rdev->saved_raid_disk = -1;
5288 clear_bit(In_sync, &rdev->flags); /* just to be sure */
5289 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
5290 set_bit(WriteMostly, &rdev->flags);
5292 clear_bit(WriteMostly, &rdev->flags);
5294 rdev->raid_disk = -1;
5295 err = bind_rdev_to_array(rdev, mddev);
5296 if (!err && !mddev->pers->hot_remove_disk) {
5297 /* If there is hot_add_disk but no hot_remove_disk
5298 * then added disks for geometry changes,
5299 * and should be added immediately.
5301 super_types[mddev->major_version].
5302 validate_super(mddev, rdev);
5303 err = mddev->pers->hot_add_disk(mddev, rdev);
5305 unbind_rdev_from_array(rdev);
5310 sysfs_notify_dirent_safe(rdev->sysfs_state);
5312 md_update_sb(mddev, 1);
5313 if (mddev->degraded)
5314 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
5315 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5317 md_new_event(mddev);
5318 md_wakeup_thread(mddev->thread);
5322 /* otherwise, add_new_disk is only allowed
5323 * for major_version==0 superblocks
5325 if (mddev->major_version != 0) {
5326 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
5331 if (!(info->state & (1<<MD_DISK_FAULTY))) {
5333 rdev = md_import_device(dev, -1, 0);
5336 "md: error, md_import_device() returned %ld\n",
5338 return PTR_ERR(rdev);
5340 rdev->desc_nr = info->number;
5341 if (info->raid_disk < mddev->raid_disks)
5342 rdev->raid_disk = info->raid_disk;
5344 rdev->raid_disk = -1;
5346 if (rdev->raid_disk < mddev->raid_disks)
5347 if (info->state & (1<<MD_DISK_SYNC))
5348 set_bit(In_sync, &rdev->flags);
5350 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
5351 set_bit(WriteMostly, &rdev->flags);
5353 if (!mddev->persistent) {
5354 printk(KERN_INFO "md: nonpersistent superblock ...\n");
5355 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
5357 rdev->sb_start = calc_dev_sboffset(rdev);
5358 rdev->sectors = rdev->sb_start;
5360 err = bind_rdev_to_array(rdev, mddev);
5370 static int hot_remove_disk(mddev_t * mddev, dev_t dev)
5372 char b[BDEVNAME_SIZE];
5375 rdev = find_rdev(mddev, dev);
5379 if (rdev->raid_disk >= 0)
5382 kick_rdev_from_array(rdev);
5383 md_update_sb(mddev, 1);
5384 md_new_event(mddev);
5388 printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n",
5389 bdevname(rdev->bdev,b), mdname(mddev));
5393 static int hot_add_disk(mddev_t * mddev, dev_t dev)
5395 char b[BDEVNAME_SIZE];
5402 if (mddev->major_version != 0) {
5403 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
5404 " version-0 superblocks.\n",
5408 if (!mddev->pers->hot_add_disk) {
5410 "%s: personality does not support diskops!\n",
5415 rdev = md_import_device(dev, -1, 0);
5418 "md: error, md_import_device() returned %ld\n",
5423 if (mddev->persistent)
5424 rdev->sb_start = calc_dev_sboffset(rdev);
5426 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
5428 rdev->sectors = rdev->sb_start;
5430 if (test_bit(Faulty, &rdev->flags)) {
5432 "md: can not hot-add faulty %s disk to %s!\n",
5433 bdevname(rdev->bdev,b), mdname(mddev));
5437 clear_bit(In_sync, &rdev->flags);
5439 rdev->saved_raid_disk = -1;
5440 err = bind_rdev_to_array(rdev, mddev);
5445 * The rest should better be atomic, we can have disk failures
5446 * noticed in interrupt contexts ...
5449 rdev->raid_disk = -1;
5451 md_update_sb(mddev, 1);
5454 * Kick recovery, maybe this spare has to be added to the
5455 * array immediately.
5457 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5458 md_wakeup_thread(mddev->thread);
5459 md_new_event(mddev);
5467 static int set_bitmap_file(mddev_t *mddev, int fd)
5472 if (!mddev->pers->quiesce)
5474 if (mddev->recovery || mddev->sync_thread)
5476 /* we should be able to change the bitmap.. */
5482 return -EEXIST; /* cannot add when bitmap is present */
5483 mddev->bitmap_info.file = fget(fd);
5485 if (mddev->bitmap_info.file == NULL) {
5486 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
5491 err = deny_bitmap_write_access(mddev->bitmap_info.file);
5493 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
5495 fput(mddev->bitmap_info.file);
5496 mddev->bitmap_info.file = NULL;
5499 mddev->bitmap_info.offset = 0; /* file overrides offset */
5500 } else if (mddev->bitmap == NULL)
5501 return -ENOENT; /* cannot remove what isn't there */
5504 mddev->pers->quiesce(mddev, 1);
5506 err = bitmap_create(mddev);
5508 err = bitmap_load(mddev);
5510 if (fd < 0 || err) {
5511 bitmap_destroy(mddev);
5512 fd = -1; /* make sure to put the file */
5514 mddev->pers->quiesce(mddev, 0);
5517 if (mddev->bitmap_info.file) {
5518 restore_bitmap_write_access(mddev->bitmap_info.file);
5519 fput(mddev->bitmap_info.file);
5521 mddev->bitmap_info.file = NULL;
5528 * set_array_info is used two different ways
5529 * The original usage is when creating a new array.
5530 * In this usage, raid_disks is > 0 and it together with
5531 * level, size, not_persistent,layout,chunksize determine the
5532 * shape of the array.
5533 * This will always create an array with a type-0.90.0 superblock.
5534 * The newer usage is when assembling an array.
5535 * In this case raid_disks will be 0, and the major_version field is
5536 * use to determine which style super-blocks are to be found on the devices.
5537 * The minor and patch _version numbers are also kept incase the
5538 * super_block handler wishes to interpret them.
5540 static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
5543 if (info->raid_disks == 0) {
5544 /* just setting version number for superblock loading */
5545 if (info->major_version < 0 ||
5546 info->major_version >= ARRAY_SIZE(super_types) ||
5547 super_types[info->major_version].name == NULL) {
5548 /* maybe try to auto-load a module? */
5550 "md: superblock version %d not known\n",
5551 info->major_version);
5554 mddev->major_version = info->major_version;
5555 mddev->minor_version = info->minor_version;
5556 mddev->patch_version = info->patch_version;
5557 mddev->persistent = !info->not_persistent;
5558 /* ensure mddev_put doesn't delete this now that there
5559 * is some minimal configuration.
5561 mddev->ctime = get_seconds();
5564 mddev->major_version = MD_MAJOR_VERSION;
5565 mddev->minor_version = MD_MINOR_VERSION;
5566 mddev->patch_version = MD_PATCHLEVEL_VERSION;
5567 mddev->ctime = get_seconds();
5569 mddev->level = info->level;
5570 mddev->clevel[0] = 0;
5571 mddev->dev_sectors = 2 * (sector_t)info->size;
5572 mddev->raid_disks = info->raid_disks;
5573 /* don't set md_minor, it is determined by which /dev/md* was
5576 if (info->state & (1<<MD_SB_CLEAN))
5577 mddev->recovery_cp = MaxSector;
5579 mddev->recovery_cp = 0;
5580 mddev->persistent = ! info->not_persistent;
5581 mddev->external = 0;
5583 mddev->layout = info->layout;
5584 mddev->chunk_sectors = info->chunk_size >> 9;
5586 mddev->max_disks = MD_SB_DISKS;
5588 if (mddev->persistent)
5590 set_bit(MD_CHANGE_DEVS, &mddev->flags);
5592 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
5593 mddev->bitmap_info.offset = 0;
5595 mddev->reshape_position = MaxSector;
5598 * Generate a 128 bit UUID
5600 get_random_bytes(mddev->uuid, 16);
5602 mddev->new_level = mddev->level;
5603 mddev->new_chunk_sectors = mddev->chunk_sectors;
5604 mddev->new_layout = mddev->layout;
5605 mddev->delta_disks = 0;
5610 void md_set_array_sectors(mddev_t *mddev, sector_t array_sectors)
5612 WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__);
5614 if (mddev->external_size)
5617 mddev->array_sectors = array_sectors;
5619 EXPORT_SYMBOL(md_set_array_sectors);
5621 static int update_size(mddev_t *mddev, sector_t num_sectors)
5625 int fit = (num_sectors == 0);
5627 if (mddev->pers->resize == NULL)
5629 /* The "num_sectors" is the number of sectors of each device that
5630 * is used. This can only make sense for arrays with redundancy.
5631 * linear and raid0 always use whatever space is available. We can only
5632 * consider changing this number if no resync or reconstruction is
5633 * happening, and if the new size is acceptable. It must fit before the
5634 * sb_start or, if that is <data_offset, it must fit before the size
5635 * of each device. If num_sectors is zero, we find the largest size
5638 if (mddev->sync_thread)
5641 /* Sorry, cannot grow a bitmap yet, just remove it,
5645 list_for_each_entry(rdev, &mddev->disks, same_set) {
5646 sector_t avail = rdev->sectors;
5648 if (fit && (num_sectors == 0 || num_sectors > avail))
5649 num_sectors = avail;
5650 if (avail < num_sectors)
5653 rv = mddev->pers->resize(mddev, num_sectors);
5655 revalidate_disk(mddev->gendisk);
5659 static int update_raid_disks(mddev_t *mddev, int raid_disks)
5662 /* change the number of raid disks */
5663 if (mddev->pers->check_reshape == NULL)
5665 if (raid_disks <= 0 ||
5666 (mddev->max_disks && raid_disks >= mddev->max_disks))
5668 if (mddev->sync_thread || mddev->reshape_position != MaxSector)
5670 mddev->delta_disks = raid_disks - mddev->raid_disks;
5672 rv = mddev->pers->check_reshape(mddev);
5674 mddev->delta_disks = 0;
5680 * update_array_info is used to change the configuration of an
5682 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
5683 * fields in the info are checked against the array.
5684 * Any differences that cannot be handled will cause an error.
5685 * Normally, only one change can be managed at a time.
5687 static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
5693 /* calculate expected state,ignoring low bits */
5694 if (mddev->bitmap && mddev->bitmap_info.offset)
5695 state |= (1 << MD_SB_BITMAP_PRESENT);
5697 if (mddev->major_version != info->major_version ||
5698 mddev->minor_version != info->minor_version ||
5699 /* mddev->patch_version != info->patch_version || */
5700 mddev->ctime != info->ctime ||
5701 mddev->level != info->level ||
5702 /* mddev->layout != info->layout || */
5703 !mddev->persistent != info->not_persistent||
5704 mddev->chunk_sectors != info->chunk_size >> 9 ||
5705 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
5706 ((state^info->state) & 0xfffffe00)
5709 /* Check there is only one change */
5710 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
5712 if (mddev->raid_disks != info->raid_disks)
5714 if (mddev->layout != info->layout)
5716 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT))
5723 if (mddev->layout != info->layout) {
5725 * we don't need to do anything at the md level, the
5726 * personality will take care of it all.
5728 if (mddev->pers->check_reshape == NULL)
5731 mddev->new_layout = info->layout;
5732 rv = mddev->pers->check_reshape(mddev);
5734 mddev->new_layout = mddev->layout;
5738 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
5739 rv = update_size(mddev, (sector_t)info->size * 2);
5741 if (mddev->raid_disks != info->raid_disks)
5742 rv = update_raid_disks(mddev, info->raid_disks);
5744 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
5745 if (mddev->pers->quiesce == NULL)
5747 if (mddev->recovery || mddev->sync_thread)
5749 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
5750 /* add the bitmap */
5753 if (mddev->bitmap_info.default_offset == 0)
5755 mddev->bitmap_info.offset =
5756 mddev->bitmap_info.default_offset;
5757 mddev->pers->quiesce(mddev, 1);
5758 rv = bitmap_create(mddev);
5760 rv = bitmap_load(mddev);
5762 bitmap_destroy(mddev);
5763 mddev->pers->quiesce(mddev, 0);
5765 /* remove the bitmap */
5768 if (mddev->bitmap->file)
5770 mddev->pers->quiesce(mddev, 1);
5771 bitmap_destroy(mddev);
5772 mddev->pers->quiesce(mddev, 0);
5773 mddev->bitmap_info.offset = 0;
5776 md_update_sb(mddev, 1);
5780 static int set_disk_faulty(mddev_t *mddev, dev_t dev)
5784 if (mddev->pers == NULL)
5787 rdev = find_rdev(mddev, dev);
5791 md_error(mddev, rdev);
5796 * We have a problem here : there is no easy way to give a CHS
5797 * virtual geometry. We currently pretend that we have a 2 heads
5798 * 4 sectors (with a BIG number of cylinders...). This drives
5799 * dosfs just mad... ;-)
5801 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
5803 mddev_t *mddev = bdev->bd_disk->private_data;
5807 geo->cylinders = mddev->array_sectors / 8;
5811 static int md_ioctl(struct block_device *bdev, fmode_t mode,
5812 unsigned int cmd, unsigned long arg)
5815 void __user *argp = (void __user *)arg;
5816 mddev_t *mddev = NULL;
5819 if (!capable(CAP_SYS_ADMIN))
5823 * Commands dealing with the RAID driver but not any
5829 err = get_version(argp);
5832 case PRINT_RAID_DEBUG:
5840 autostart_arrays(arg);
5847 * Commands creating/starting a new array:
5850 mddev = bdev->bd_disk->private_data;
5857 err = mddev_lock(mddev);
5860 "md: ioctl lock interrupted, reason %d, cmd %d\n",
5867 case SET_ARRAY_INFO:
5869 mdu_array_info_t info;
5871 memset(&info, 0, sizeof(info));
5872 else if (copy_from_user(&info, argp, sizeof(info))) {
5877 err = update_array_info(mddev, &info);
5879 printk(KERN_WARNING "md: couldn't update"
5880 " array info. %d\n", err);
5885 if (!list_empty(&mddev->disks)) {
5887 "md: array %s already has disks!\n",
5892 if (mddev->raid_disks) {
5894 "md: array %s already initialised!\n",
5899 err = set_array_info(mddev, &info);
5901 printk(KERN_WARNING "md: couldn't set"
5902 " array info. %d\n", err);
5912 * Commands querying/configuring an existing array:
5914 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
5915 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
5916 if ((!mddev->raid_disks && !mddev->external)
5917 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
5918 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
5919 && cmd != GET_BITMAP_FILE) {
5925 * Commands even a read-only array can execute:
5929 case GET_ARRAY_INFO:
5930 err = get_array_info(mddev, argp);
5933 case GET_BITMAP_FILE:
5934 err = get_bitmap_file(mddev, argp);
5938 err = get_disk_info(mddev, argp);
5941 case RESTART_ARRAY_RW:
5942 err = restart_array(mddev);
5946 err = do_md_stop(mddev, 0, 1);
5950 err = md_set_readonly(mddev, 1);
5954 if (get_user(ro, (int __user *)(arg))) {
5960 /* if the bdev is going readonly the value of mddev->ro
5961 * does not matter, no writes are coming
5966 /* are we are already prepared for writes? */
5970 /* transitioning to readauto need only happen for
5971 * arrays that call md_write_start
5974 err = restart_array(mddev);
5977 set_disk_ro(mddev->gendisk, 0);
5984 * The remaining ioctls are changing the state of the
5985 * superblock, so we do not allow them on read-only arrays.
5986 * However non-MD ioctls (e.g. get-size) will still come through
5987 * here and hit the 'default' below, so only disallow
5988 * 'md' ioctls, and switch to rw mode if started auto-readonly.
5990 if (_IOC_TYPE(cmd) == MD_MAJOR && mddev->ro && mddev->pers) {
5991 if (mddev->ro == 2) {
5993 sysfs_notify_dirent_safe(mddev->sysfs_state);
5994 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5995 md_wakeup_thread(mddev->thread);
6006 mdu_disk_info_t info;
6007 if (copy_from_user(&info, argp, sizeof(info)))
6010 err = add_new_disk(mddev, &info);
6014 case HOT_REMOVE_DISK:
6015 err = hot_remove_disk(mddev, new_decode_dev(arg));
6019 err = hot_add_disk(mddev, new_decode_dev(arg));
6022 case SET_DISK_FAULTY:
6023 err = set_disk_faulty(mddev, new_decode_dev(arg));
6027 err = do_md_run(mddev);
6030 case SET_BITMAP_FILE:
6031 err = set_bitmap_file(mddev, (int)arg);
6041 if (mddev->hold_active == UNTIL_IOCTL &&
6043 mddev->hold_active = 0;
6044 mddev_unlock(mddev);
6053 #ifdef CONFIG_COMPAT
6054 static int md_compat_ioctl(struct block_device *bdev, fmode_t mode,
6055 unsigned int cmd, unsigned long arg)
6058 case HOT_REMOVE_DISK:
6060 case SET_DISK_FAULTY:
6061 case SET_BITMAP_FILE:
6062 /* These take in integer arg, do not convert */
6065 arg = (unsigned long)compat_ptr(arg);
6069 return md_ioctl(bdev, mode, cmd, arg);
6071 #endif /* CONFIG_COMPAT */
6073 static int md_open(struct block_device *bdev, fmode_t mode)
6076 * Succeed if we can lock the mddev, which confirms that
6077 * it isn't being stopped right now.
6079 mddev_t *mddev = mddev_find(bdev->bd_dev);
6082 if (mddev->gendisk != bdev->bd_disk) {
6083 /* we are racing with mddev_put which is discarding this
6087 /* Wait until bdev->bd_disk is definitely gone */
6088 flush_workqueue(md_misc_wq);
6089 /* Then retry the open from the top */
6090 return -ERESTARTSYS;
6092 BUG_ON(mddev != bdev->bd_disk->private_data);
6094 if ((err = mutex_lock_interruptible(&mddev->open_mutex)))
6098 atomic_inc(&mddev->openers);
6099 mutex_unlock(&mddev->open_mutex);
6101 check_disk_change(bdev);
6106 static int md_release(struct gendisk *disk, fmode_t mode)
6108 mddev_t *mddev = disk->private_data;
6111 atomic_dec(&mddev->openers);
6117 static int md_media_changed(struct gendisk *disk)
6119 mddev_t *mddev = disk->private_data;
6121 return mddev->changed;
6124 static int md_revalidate(struct gendisk *disk)
6126 mddev_t *mddev = disk->private_data;
6131 static const struct block_device_operations md_fops =
6133 .owner = THIS_MODULE,
6135 .release = md_release,
6137 #ifdef CONFIG_COMPAT
6138 .compat_ioctl = md_compat_ioctl,
6140 .getgeo = md_getgeo,
6141 .media_changed = md_media_changed,
6142 .revalidate_disk= md_revalidate,
6145 static int md_thread(void * arg)
6147 mdk_thread_t *thread = arg;
6150 * md_thread is a 'system-thread', it's priority should be very
6151 * high. We avoid resource deadlocks individually in each
6152 * raid personality. (RAID5 does preallocation) We also use RR and
6153 * the very same RT priority as kswapd, thus we will never get
6154 * into a priority inversion deadlock.
6156 * we definitely have to have equal or higher priority than
6157 * bdflush, otherwise bdflush will deadlock if there are too
6158 * many dirty RAID5 blocks.
6161 allow_signal(SIGKILL);
6162 while (!kthread_should_stop()) {
6164 /* We need to wait INTERRUPTIBLE so that
6165 * we don't add to the load-average.
6166 * That means we need to be sure no signals are
6169 if (signal_pending(current))
6170 flush_signals(current);
6172 wait_event_interruptible_timeout
6174 test_bit(THREAD_WAKEUP, &thread->flags)
6175 || kthread_should_stop(),
6178 clear_bit(THREAD_WAKEUP, &thread->flags);
6179 if (!kthread_should_stop())
6180 thread->run(thread->mddev);
6186 void md_wakeup_thread(mdk_thread_t *thread)
6189 dprintk("md: waking up MD thread %s.\n", thread->tsk->comm);
6190 set_bit(THREAD_WAKEUP, &thread->flags);
6191 wake_up(&thread->wqueue);
6195 mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
6198 mdk_thread_t *thread;
6200 thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL);
6204 init_waitqueue_head(&thread->wqueue);
6207 thread->mddev = mddev;
6208 thread->timeout = MAX_SCHEDULE_TIMEOUT;
6209 thread->tsk = kthread_run(md_thread, thread,
6211 mdname(thread->mddev),
6212 name ?: mddev->pers->name);
6213 if (IS_ERR(thread->tsk)) {
6220 void md_unregister_thread(mdk_thread_t *thread)
6224 dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
6226 kthread_stop(thread->tsk);
6230 void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
6237 if (!rdev || test_bit(Faulty, &rdev->flags))
6240 if (mddev->external)
6241 set_bit(Blocked, &rdev->flags);
6243 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
6245 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
6246 __builtin_return_address(0),__builtin_return_address(1),
6247 __builtin_return_address(2),__builtin_return_address(3));
6251 if (!mddev->pers->error_handler)
6253 mddev->pers->error_handler(mddev,rdev);
6254 if (mddev->degraded)
6255 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6256 sysfs_notify_dirent_safe(rdev->sysfs_state);
6257 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6258 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6259 md_wakeup_thread(mddev->thread);
6260 if (mddev->event_work.func)
6261 queue_work(md_misc_wq, &mddev->event_work);
6262 md_new_event_inintr(mddev);
6265 /* seq_file implementation /proc/mdstat */
6267 static void status_unused(struct seq_file *seq)
6272 seq_printf(seq, "unused devices: ");
6274 list_for_each_entry(rdev, &pending_raid_disks, same_set) {
6275 char b[BDEVNAME_SIZE];
6277 seq_printf(seq, "%s ",
6278 bdevname(rdev->bdev,b));
6281 seq_printf(seq, "<none>");
6283 seq_printf(seq, "\n");
6287 static void status_resync(struct seq_file *seq, mddev_t * mddev)
6289 sector_t max_sectors, resync, res;
6290 unsigned long dt, db;
6293 unsigned int per_milli;
6295 resync = mddev->curr_resync - atomic_read(&mddev->recovery_active);
6297 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
6298 max_sectors = mddev->resync_max_sectors;
6300 max_sectors = mddev->dev_sectors;
6303 * Should not happen.
6309 /* Pick 'scale' such that (resync>>scale)*1000 will fit
6310 * in a sector_t, and (max_sectors>>scale) will fit in a
6311 * u32, as those are the requirements for sector_div.
6312 * Thus 'scale' must be at least 10
6315 if (sizeof(sector_t) > sizeof(unsigned long)) {
6316 while ( max_sectors/2 > (1ULL<<(scale+32)))
6319 res = (resync>>scale)*1000;
6320 sector_div(res, (u32)((max_sectors>>scale)+1));
6324 int i, x = per_milli/50, y = 20-x;
6325 seq_printf(seq, "[");
6326 for (i = 0; i < x; i++)
6327 seq_printf(seq, "=");
6328 seq_printf(seq, ">");
6329 for (i = 0; i < y; i++)
6330 seq_printf(seq, ".");
6331 seq_printf(seq, "] ");
6333 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
6334 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
6336 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
6338 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
6339 "resync" : "recovery"))),
6340 per_milli/10, per_milli % 10,
6341 (unsigned long long) resync/2,
6342 (unsigned long long) max_sectors/2);
6345 * dt: time from mark until now
6346 * db: blocks written from mark until now
6347 * rt: remaining time
6349 * rt is a sector_t, so could be 32bit or 64bit.
6350 * So we divide before multiply in case it is 32bit and close
6352 * We scale the divisor (db) by 32 to avoid losing precision
6353 * near the end of resync when the number of remaining sectors
6355 * We then divide rt by 32 after multiplying by db to compensate.
6356 * The '+1' avoids division by zero if db is very small.
6358 dt = ((jiffies - mddev->resync_mark) / HZ);
6360 db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active))
6361 - mddev->resync_mark_cnt;
6363 rt = max_sectors - resync; /* number of remaining sectors */
6364 sector_div(rt, db/32+1);
6368 seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60,
6369 ((unsigned long)rt % 60)/6);
6371 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
6374 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
6376 struct list_head *tmp;
6386 spin_lock(&all_mddevs_lock);
6387 list_for_each(tmp,&all_mddevs)
6389 mddev = list_entry(tmp, mddev_t, all_mddevs);
6391 spin_unlock(&all_mddevs_lock);
6394 spin_unlock(&all_mddevs_lock);
6396 return (void*)2;/* tail */
6400 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
6402 struct list_head *tmp;
6403 mddev_t *next_mddev, *mddev = v;
6409 spin_lock(&all_mddevs_lock);
6411 tmp = all_mddevs.next;
6413 tmp = mddev->all_mddevs.next;
6414 if (tmp != &all_mddevs)
6415 next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs));
6417 next_mddev = (void*)2;
6420 spin_unlock(&all_mddevs_lock);
6428 static void md_seq_stop(struct seq_file *seq, void *v)
6432 if (mddev && v != (void*)1 && v != (void*)2)
6436 struct mdstat_info {
6440 static int md_seq_show(struct seq_file *seq, void *v)
6445 struct mdstat_info *mi = seq->private;
6446 struct bitmap *bitmap;
6448 if (v == (void*)1) {
6449 struct mdk_personality *pers;
6450 seq_printf(seq, "Personalities : ");
6451 spin_lock(&pers_lock);
6452 list_for_each_entry(pers, &pers_list, list)
6453 seq_printf(seq, "[%s] ", pers->name);
6455 spin_unlock(&pers_lock);
6456 seq_printf(seq, "\n");
6457 mi->event = atomic_read(&md_event_count);
6460 if (v == (void*)2) {
6465 if (mddev_lock(mddev) < 0)
6468 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
6469 seq_printf(seq, "%s : %sactive", mdname(mddev),
6470 mddev->pers ? "" : "in");
6473 seq_printf(seq, " (read-only)");
6475 seq_printf(seq, " (auto-read-only)");
6476 seq_printf(seq, " %s", mddev->pers->name);
6480 list_for_each_entry(rdev, &mddev->disks, same_set) {
6481 char b[BDEVNAME_SIZE];
6482 seq_printf(seq, " %s[%d]",
6483 bdevname(rdev->bdev,b), rdev->desc_nr);
6484 if (test_bit(WriteMostly, &rdev->flags))
6485 seq_printf(seq, "(W)");
6486 if (test_bit(Faulty, &rdev->flags)) {
6487 seq_printf(seq, "(F)");
6489 } else if (rdev->raid_disk < 0)
6490 seq_printf(seq, "(S)"); /* spare */
6491 sectors += rdev->sectors;
6494 if (!list_empty(&mddev->disks)) {
6496 seq_printf(seq, "\n %llu blocks",
6497 (unsigned long long)
6498 mddev->array_sectors / 2);
6500 seq_printf(seq, "\n %llu blocks",
6501 (unsigned long long)sectors / 2);
6503 if (mddev->persistent) {
6504 if (mddev->major_version != 0 ||
6505 mddev->minor_version != 90) {
6506 seq_printf(seq," super %d.%d",
6507 mddev->major_version,
6508 mddev->minor_version);
6510 } else if (mddev->external)
6511 seq_printf(seq, " super external:%s",
6512 mddev->metadata_type);
6514 seq_printf(seq, " super non-persistent");
6517 mddev->pers->status(seq, mddev);
6518 seq_printf(seq, "\n ");
6519 if (mddev->pers->sync_request) {
6520 if (mddev->curr_resync > 2) {
6521 status_resync(seq, mddev);
6522 seq_printf(seq, "\n ");
6523 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
6524 seq_printf(seq, "\tresync=DELAYED\n ");
6525 else if (mddev->recovery_cp < MaxSector)
6526 seq_printf(seq, "\tresync=PENDING\n ");
6529 seq_printf(seq, "\n ");
6531 if ((bitmap = mddev->bitmap)) {
6532 unsigned long chunk_kb;
6533 unsigned long flags;
6534 spin_lock_irqsave(&bitmap->lock, flags);
6535 chunk_kb = mddev->bitmap_info.chunksize >> 10;
6536 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
6538 bitmap->pages - bitmap->missing_pages,
6540 (bitmap->pages - bitmap->missing_pages)
6541 << (PAGE_SHIFT - 10),
6542 chunk_kb ? chunk_kb : mddev->bitmap_info.chunksize,
6543 chunk_kb ? "KB" : "B");
6545 seq_printf(seq, ", file: ");
6546 seq_path(seq, &bitmap->file->f_path, " \t\n");
6549 seq_printf(seq, "\n");
6550 spin_unlock_irqrestore(&bitmap->lock, flags);
6553 seq_printf(seq, "\n");
6555 mddev_unlock(mddev);
6560 static const struct seq_operations md_seq_ops = {
6561 .start = md_seq_start,
6562 .next = md_seq_next,
6563 .stop = md_seq_stop,
6564 .show = md_seq_show,
6567 static int md_seq_open(struct inode *inode, struct file *file)
6570 struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL);
6574 error = seq_open(file, &md_seq_ops);
6578 struct seq_file *p = file->private_data;
6580 mi->event = atomic_read(&md_event_count);
6585 static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
6587 struct seq_file *m = filp->private_data;
6588 struct mdstat_info *mi = m->private;
6591 poll_wait(filp, &md_event_waiters, wait);
6593 /* always allow read */
6594 mask = POLLIN | POLLRDNORM;
6596 if (mi->event != atomic_read(&md_event_count))
6597 mask |= POLLERR | POLLPRI;
6601 static const struct file_operations md_seq_fops = {
6602 .owner = THIS_MODULE,
6603 .open = md_seq_open,
6605 .llseek = seq_lseek,
6606 .release = seq_release_private,
6607 .poll = mdstat_poll,
6610 int register_md_personality(struct mdk_personality *p)
6612 spin_lock(&pers_lock);
6613 list_add_tail(&p->list, &pers_list);
6614 printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level);
6615 spin_unlock(&pers_lock);
6619 int unregister_md_personality(struct mdk_personality *p)
6621 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
6622 spin_lock(&pers_lock);
6623 list_del_init(&p->list);
6624 spin_unlock(&pers_lock);
6628 static int is_mddev_idle(mddev_t *mddev, int init)
6636 rdev_for_each_rcu(rdev, mddev) {
6637 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
6638 curr_events = (int)part_stat_read(&disk->part0, sectors[0]) +
6639 (int)part_stat_read(&disk->part0, sectors[1]) -
6640 atomic_read(&disk->sync_io);
6641 /* sync IO will cause sync_io to increase before the disk_stats
6642 * as sync_io is counted when a request starts, and
6643 * disk_stats is counted when it completes.
6644 * So resync activity will cause curr_events to be smaller than
6645 * when there was no such activity.
6646 * non-sync IO will cause disk_stat to increase without
6647 * increasing sync_io so curr_events will (eventually)
6648 * be larger than it was before. Once it becomes
6649 * substantially larger, the test below will cause
6650 * the array to appear non-idle, and resync will slow
6652 * If there is a lot of outstanding resync activity when
6653 * we set last_event to curr_events, then all that activity
6654 * completing might cause the array to appear non-idle
6655 * and resync will be slowed down even though there might
6656 * not have been non-resync activity. This will only
6657 * happen once though. 'last_events' will soon reflect
6658 * the state where there is little or no outstanding
6659 * resync requests, and further resync activity will
6660 * always make curr_events less than last_events.
6663 if (init || curr_events - rdev->last_events > 64) {
6664 rdev->last_events = curr_events;
6672 void md_done_sync(mddev_t *mddev, int blocks, int ok)
6674 /* another "blocks" (512byte) blocks have been synced */
6675 atomic_sub(blocks, &mddev->recovery_active);
6676 wake_up(&mddev->recovery_wait);
6678 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6679 md_wakeup_thread(mddev->thread);
6680 // stop recovery, signal do_sync ....
6685 /* md_write_start(mddev, bi)
6686 * If we need to update some array metadata (e.g. 'active' flag
6687 * in superblock) before writing, schedule a superblock update
6688 * and wait for it to complete.
6690 void md_write_start(mddev_t *mddev, struct bio *bi)
6693 if (bio_data_dir(bi) != WRITE)
6696 BUG_ON(mddev->ro == 1);
6697 if (mddev->ro == 2) {
6698 /* need to switch to read/write */
6700 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6701 md_wakeup_thread(mddev->thread);
6702 md_wakeup_thread(mddev->sync_thread);
6705 atomic_inc(&mddev->writes_pending);
6706 if (mddev->safemode == 1)
6707 mddev->safemode = 0;
6708 if (mddev->in_sync) {
6709 spin_lock_irq(&mddev->write_lock);
6710 if (mddev->in_sync) {
6712 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6713 set_bit(MD_CHANGE_PENDING, &mddev->flags);
6714 md_wakeup_thread(mddev->thread);
6717 spin_unlock_irq(&mddev->write_lock);
6720 sysfs_notify_dirent_safe(mddev->sysfs_state);
6721 wait_event(mddev->sb_wait,
6722 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
6725 void md_write_end(mddev_t *mddev)
6727 if (atomic_dec_and_test(&mddev->writes_pending)) {
6728 if (mddev->safemode == 2)
6729 md_wakeup_thread(mddev->thread);
6730 else if (mddev->safemode_delay)
6731 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
6735 /* md_allow_write(mddev)
6736 * Calling this ensures that the array is marked 'active' so that writes
6737 * may proceed without blocking. It is important to call this before
6738 * attempting a GFP_KERNEL allocation while holding the mddev lock.
6739 * Must be called with mddev_lock held.
6741 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
6742 * is dropped, so return -EAGAIN after notifying userspace.
6744 int md_allow_write(mddev_t *mddev)
6750 if (!mddev->pers->sync_request)
6753 spin_lock_irq(&mddev->write_lock);
6754 if (mddev->in_sync) {
6756 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6757 set_bit(MD_CHANGE_PENDING, &mddev->flags);
6758 if (mddev->safemode_delay &&
6759 mddev->safemode == 0)
6760 mddev->safemode = 1;
6761 spin_unlock_irq(&mddev->write_lock);
6762 md_update_sb(mddev, 0);
6763 sysfs_notify_dirent_safe(mddev->sysfs_state);
6765 spin_unlock_irq(&mddev->write_lock);
6767 if (test_bit(MD_CHANGE_PENDING, &mddev->flags))
6772 EXPORT_SYMBOL_GPL(md_allow_write);
6774 #define SYNC_MARKS 10
6775 #define SYNC_MARK_STEP (3*HZ)
6776 void md_do_sync(mddev_t *mddev)
6779 unsigned int currspeed = 0,
6781 sector_t max_sectors,j, io_sectors;
6782 unsigned long mark[SYNC_MARKS];
6783 sector_t mark_cnt[SYNC_MARKS];
6785 struct list_head *tmp;
6786 sector_t last_check;
6791 /* just incase thread restarts... */
6792 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
6794 if (mddev->ro) /* never try to sync a read-only array */
6797 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
6798 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
6799 desc = "data-check";
6800 else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
6801 desc = "requested-resync";
6804 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
6809 /* we overload curr_resync somewhat here.
6810 * 0 == not engaged in resync at all
6811 * 2 == checking that there is no conflict with another sync
6812 * 1 == like 2, but have yielded to allow conflicting resync to
6814 * other == active in resync - this many blocks
6816 * Before starting a resync we must have set curr_resync to
6817 * 2, and then checked that every "conflicting" array has curr_resync
6818 * less than ours. When we find one that is the same or higher
6819 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
6820 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
6821 * This will mean we have to start checking from the beginning again.
6826 mddev->curr_resync = 2;
6829 if (kthread_should_stop())
6830 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6832 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
6834 for_each_mddev(mddev2, tmp) {
6835 if (mddev2 == mddev)
6837 if (!mddev->parallel_resync
6838 && mddev2->curr_resync
6839 && match_mddev_units(mddev, mddev2)) {
6841 if (mddev < mddev2 && mddev->curr_resync == 2) {
6842 /* arbitrarily yield */
6843 mddev->curr_resync = 1;
6844 wake_up(&resync_wait);
6846 if (mddev > mddev2 && mddev->curr_resync == 1)
6847 /* no need to wait here, we can wait the next
6848 * time 'round when curr_resync == 2
6851 /* We need to wait 'interruptible' so as not to
6852 * contribute to the load average, and not to
6853 * be caught by 'softlockup'
6855 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
6856 if (!kthread_should_stop() &&
6857 mddev2->curr_resync >= mddev->curr_resync) {
6858 printk(KERN_INFO "md: delaying %s of %s"
6859 " until %s has finished (they"
6860 " share one or more physical units)\n",
6861 desc, mdname(mddev), mdname(mddev2));
6863 if (signal_pending(current))
6864 flush_signals(current);
6866 finish_wait(&resync_wait, &wq);
6869 finish_wait(&resync_wait, &wq);
6872 } while (mddev->curr_resync < 2);
6875 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
6876 /* resync follows the size requested by the personality,
6877 * which defaults to physical size, but can be virtual size
6879 max_sectors = mddev->resync_max_sectors;
6880 mddev->resync_mismatches = 0;
6881 /* we don't use the checkpoint if there's a bitmap */
6882 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
6883 j = mddev->resync_min;
6884 else if (!mddev->bitmap)
6885 j = mddev->recovery_cp;
6887 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
6888 max_sectors = mddev->dev_sectors;
6890 /* recovery follows the physical size of devices */
6891 max_sectors = mddev->dev_sectors;
6894 list_for_each_entry_rcu(rdev, &mddev->disks, same_set)
6895 if (rdev->raid_disk >= 0 &&
6896 !test_bit(Faulty, &rdev->flags) &&
6897 !test_bit(In_sync, &rdev->flags) &&
6898 rdev->recovery_offset < j)
6899 j = rdev->recovery_offset;
6903 printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev));
6904 printk(KERN_INFO "md: minimum _guaranteed_ speed:"
6905 " %d KB/sec/disk.\n", speed_min(mddev));
6906 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
6907 "(but not more than %d KB/sec) for %s.\n",
6908 speed_max(mddev), desc);
6910 is_mddev_idle(mddev, 1); /* this initializes IO event counters */
6913 for (m = 0; m < SYNC_MARKS; m++) {
6915 mark_cnt[m] = io_sectors;
6918 mddev->resync_mark = mark[last_mark];
6919 mddev->resync_mark_cnt = mark_cnt[last_mark];
6922 * Tune reconstruction:
6924 window = 32*(PAGE_SIZE/512);
6925 printk(KERN_INFO "md: using %dk window, over a total of %lluk.\n",
6926 window/2, (unsigned long long)max_sectors/2);
6928 atomic_set(&mddev->recovery_active, 0);
6933 "md: resuming %s of %s from checkpoint.\n",
6934 desc, mdname(mddev));
6935 mddev->curr_resync = j;
6937 mddev->curr_resync_completed = j;
6939 while (j < max_sectors) {
6944 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
6945 ((mddev->curr_resync > mddev->curr_resync_completed &&
6946 (mddev->curr_resync - mddev->curr_resync_completed)
6947 > (max_sectors >> 4)) ||
6948 (j - mddev->curr_resync_completed)*2
6949 >= mddev->resync_max - mddev->curr_resync_completed
6951 /* time to update curr_resync_completed */
6952 wait_event(mddev->recovery_wait,
6953 atomic_read(&mddev->recovery_active) == 0);
6954 mddev->curr_resync_completed = j;
6955 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6956 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
6959 while (j >= mddev->resync_max && !kthread_should_stop()) {
6960 /* As this condition is controlled by user-space,
6961 * we can block indefinitely, so use '_interruptible'
6962 * to avoid triggering warnings.
6964 flush_signals(current); /* just in case */
6965 wait_event_interruptible(mddev->recovery_wait,
6966 mddev->resync_max > j
6967 || kthread_should_stop());
6970 if (kthread_should_stop())
6973 sectors = mddev->pers->sync_request(mddev, j, &skipped,
6974 currspeed < speed_min(mddev));
6976 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6980 if (!skipped) { /* actual IO requested */
6981 io_sectors += sectors;
6982 atomic_add(sectors, &mddev->recovery_active);
6986 if (j>1) mddev->curr_resync = j;
6987 mddev->curr_mark_cnt = io_sectors;
6988 if (last_check == 0)
6989 /* this is the earliers that rebuilt will be
6990 * visible in /proc/mdstat
6992 md_new_event(mddev);
6994 if (last_check + window > io_sectors || j == max_sectors)
6997 last_check = io_sectors;
6999 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
7003 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
7005 int next = (last_mark+1) % SYNC_MARKS;
7007 mddev->resync_mark = mark[next];
7008 mddev->resync_mark_cnt = mark_cnt[next];
7009 mark[next] = jiffies;
7010 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
7015 if (kthread_should_stop())
7020 * this loop exits only if either when we are slower than
7021 * the 'hard' speed limit, or the system was IO-idle for
7023 * the system might be non-idle CPU-wise, but we only care
7024 * about not overloading the IO subsystem. (things like an
7025 * e2fsck being done on the RAID array should execute fast)
7029 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
7030 /((jiffies-mddev->resync_mark)/HZ +1) +1;
7032 if (currspeed > speed_min(mddev)) {
7033 if ((currspeed > speed_max(mddev)) ||
7034 !is_mddev_idle(mddev, 0)) {
7040 printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc);
7042 * this also signals 'finished resyncing' to md_stop
7045 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
7047 /* tell personality that we are finished */
7048 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
7050 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
7051 mddev->curr_resync > 2) {
7052 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
7053 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
7054 if (mddev->curr_resync >= mddev->recovery_cp) {
7056 "md: checkpointing %s of %s.\n",
7057 desc, mdname(mddev));
7058 mddev->recovery_cp = mddev->curr_resync;
7061 mddev->recovery_cp = MaxSector;
7063 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
7064 mddev->curr_resync = MaxSector;
7066 list_for_each_entry_rcu(rdev, &mddev->disks, same_set)
7067 if (rdev->raid_disk >= 0 &&
7068 mddev->delta_disks >= 0 &&
7069 !test_bit(Faulty, &rdev->flags) &&
7070 !test_bit(In_sync, &rdev->flags) &&
7071 rdev->recovery_offset < mddev->curr_resync)
7072 rdev->recovery_offset = mddev->curr_resync;
7076 set_bit(MD_CHANGE_DEVS, &mddev->flags);
7079 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
7080 /* We completed so min/max setting can be forgotten if used. */
7081 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
7082 mddev->resync_min = 0;
7083 mddev->resync_max = MaxSector;
7084 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
7085 mddev->resync_min = mddev->curr_resync_completed;
7086 mddev->curr_resync = 0;
7087 wake_up(&resync_wait);
7088 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
7089 md_wakeup_thread(mddev->thread);
7094 * got a signal, exit.
7097 "md: md_do_sync() got signal ... exiting\n");
7098 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7102 EXPORT_SYMBOL_GPL(md_do_sync);
7104 static int remove_and_add_spares(mddev_t *mddev)
7109 mddev->curr_resync_completed = 0;
7111 list_for_each_entry(rdev, &mddev->disks, same_set)
7112 if (rdev->raid_disk >= 0 &&
7113 !test_bit(Blocked, &rdev->flags) &&
7114 (test_bit(Faulty, &rdev->flags) ||
7115 ! test_bit(In_sync, &rdev->flags)) &&
7116 atomic_read(&rdev->nr_pending)==0) {
7117 if (mddev->pers->hot_remove_disk(
7118 mddev, rdev->raid_disk)==0) {
7119 sysfs_unlink_rdev(mddev, rdev);
7120 rdev->raid_disk = -1;
7124 if (mddev->degraded) {
7125 list_for_each_entry(rdev, &mddev->disks, same_set) {
7126 if (rdev->raid_disk >= 0 &&
7127 !test_bit(In_sync, &rdev->flags) &&
7128 !test_bit(Faulty, &rdev->flags) &&
7129 !test_bit(Blocked, &rdev->flags))
7131 if (rdev->raid_disk < 0
7132 && !test_bit(Faulty, &rdev->flags)) {
7133 rdev->recovery_offset = 0;
7135 hot_add_disk(mddev, rdev) == 0) {
7136 if (sysfs_link_rdev(mddev, rdev))
7137 /* failure here is OK */;
7139 md_new_event(mddev);
7140 set_bit(MD_CHANGE_DEVS, &mddev->flags);
7149 static void reap_sync_thread(mddev_t *mddev)
7153 /* resync has finished, collect result */
7154 md_unregister_thread(mddev->sync_thread);
7155 mddev->sync_thread = NULL;
7156 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
7157 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
7159 /* activate any spares */
7160 if (mddev->pers->spare_active(mddev))
7161 sysfs_notify(&mddev->kobj, NULL,
7164 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
7165 mddev->pers->finish_reshape)
7166 mddev->pers->finish_reshape(mddev);
7167 md_update_sb(mddev, 1);
7169 /* if array is no-longer degraded, then any saved_raid_disk
7170 * information must be scrapped
7172 if (!mddev->degraded)
7173 list_for_each_entry(rdev, &mddev->disks, same_set)
7174 rdev->saved_raid_disk = -1;
7176 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7177 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7178 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
7179 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
7180 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
7181 /* flag recovery needed just to double check */
7182 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7183 sysfs_notify_dirent_safe(mddev->sysfs_action);
7184 md_new_event(mddev);
7185 if (mddev->event_work.func)
7186 queue_work(md_misc_wq, &mddev->event_work);
7190 * This routine is regularly called by all per-raid-array threads to
7191 * deal with generic issues like resync and super-block update.
7192 * Raid personalities that don't have a thread (linear/raid0) do not
7193 * need this as they never do any recovery or update the superblock.
7195 * It does not do any resync itself, but rather "forks" off other threads
7196 * to do that as needed.
7197 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
7198 * "->recovery" and create a thread at ->sync_thread.
7199 * When the thread finishes it sets MD_RECOVERY_DONE
7200 * and wakeups up this thread which will reap the thread and finish up.
7201 * This thread also removes any faulty devices (with nr_pending == 0).
7203 * The overall approach is:
7204 * 1/ if the superblock needs updating, update it.
7205 * 2/ If a recovery thread is running, don't do anything else.
7206 * 3/ If recovery has finished, clean up, possibly marking spares active.
7207 * 4/ If there are any faulty devices, remove them.
7208 * 5/ If array is degraded, try to add spares devices
7209 * 6/ If array has spares or is not in-sync, start a resync thread.
7211 void md_check_recovery(mddev_t *mddev)
7213 if (mddev->suspended)
7217 bitmap_daemon_work(mddev);
7219 if (signal_pending(current)) {
7220 if (mddev->pers->sync_request && !mddev->external) {
7221 printk(KERN_INFO "md: %s in immediate safe mode\n",
7223 mddev->safemode = 2;
7225 flush_signals(current);
7228 if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
7231 (mddev->flags & ~ (1<<MD_CHANGE_PENDING)) ||
7232 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
7233 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
7234 (mddev->external == 0 && mddev->safemode == 1) ||
7235 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
7236 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
7240 if (mddev_trylock(mddev)) {
7244 /* Only thing we do on a ro array is remove
7248 list_for_each_entry(rdev, &mddev->disks, same_set)
7249 if (rdev->raid_disk >= 0 &&
7250 !test_bit(Blocked, &rdev->flags) &&
7251 test_bit(Faulty, &rdev->flags) &&
7252 atomic_read(&rdev->nr_pending)==0) {
7253 if (mddev->pers->hot_remove_disk(
7254 mddev, rdev->raid_disk)==0) {
7255 sysfs_unlink_rdev(mddev, rdev);
7256 rdev->raid_disk = -1;
7259 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7263 if (!mddev->external) {
7265 spin_lock_irq(&mddev->write_lock);
7266 if (mddev->safemode &&
7267 !atomic_read(&mddev->writes_pending) &&
7269 mddev->recovery_cp == MaxSector) {
7272 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
7274 if (mddev->safemode == 1)
7275 mddev->safemode = 0;
7276 spin_unlock_irq(&mddev->write_lock);
7278 sysfs_notify_dirent_safe(mddev->sysfs_state);
7282 md_update_sb(mddev, 0);
7284 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
7285 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
7286 /* resync/recovery still happening */
7287 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7290 if (mddev->sync_thread) {
7291 reap_sync_thread(mddev);
7294 /* Set RUNNING before clearing NEEDED to avoid
7295 * any transients in the value of "sync_action".
7297 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7298 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7299 /* Clear some bits that don't mean anything, but
7302 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
7303 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
7305 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
7307 /* no recovery is running.
7308 * remove any failed drives, then
7309 * add spares if possible.
7310 * Spare are also removed and re-added, to allow
7311 * the personality to fail the re-add.
7314 if (mddev->reshape_position != MaxSector) {
7315 if (mddev->pers->check_reshape == NULL ||
7316 mddev->pers->check_reshape(mddev) != 0)
7317 /* Cannot proceed */
7319 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
7320 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7321 } else if ((spares = remove_and_add_spares(mddev))) {
7322 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7323 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
7324 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
7325 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7326 } else if (mddev->recovery_cp < MaxSector) {
7327 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7328 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7329 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
7330 /* nothing to be done ... */
7333 if (mddev->pers->sync_request) {
7334 if (spares && mddev->bitmap && ! mddev->bitmap->file) {
7335 /* We are adding a device or devices to an array
7336 * which has the bitmap stored on all devices.
7337 * So make sure all bitmap pages get written
7339 bitmap_write_all(mddev->bitmap);
7341 mddev->sync_thread = md_register_thread(md_do_sync,
7344 if (!mddev->sync_thread) {
7345 printk(KERN_ERR "%s: could not start resync"
7348 /* leave the spares where they are, it shouldn't hurt */
7349 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7350 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7351 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
7352 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
7353 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
7355 md_wakeup_thread(mddev->sync_thread);
7356 sysfs_notify_dirent_safe(mddev->sysfs_action);
7357 md_new_event(mddev);
7360 if (!mddev->sync_thread) {
7361 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7362 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
7364 if (mddev->sysfs_action)
7365 sysfs_notify_dirent_safe(mddev->sysfs_action);
7367 mddev_unlock(mddev);
7371 void md_wait_for_blocked_rdev(mdk_rdev_t *rdev, mddev_t *mddev)
7373 sysfs_notify_dirent_safe(rdev->sysfs_state);
7374 wait_event_timeout(rdev->blocked_wait,
7375 !test_bit(Blocked, &rdev->flags),
7376 msecs_to_jiffies(5000));
7377 rdev_dec_pending(rdev, mddev);
7379 EXPORT_SYMBOL(md_wait_for_blocked_rdev);
7382 /* Bad block management.
7383 * We can record which blocks on each device are 'bad' and so just
7384 * fail those blocks, or that stripe, rather than the whole device.
7385 * Entries in the bad-block table are 64bits wide. This comprises:
7386 * Length of bad-range, in sectors: 0-511 for lengths 1-512
7387 * Start of bad-range, sector offset, 54 bits (allows 8 exbibytes)
7388 * A 'shift' can be set so that larger blocks are tracked and
7389 * consequently larger devices can be covered.
7390 * 'Acknowledged' flag - 1 bit. - the most significant bit.
7392 * Locking of the bad-block table uses a seqlock so md_is_badblock
7393 * might need to retry if it is very unlucky.
7394 * We will sometimes want to check for bad blocks in a bi_end_io function,
7395 * so we use the write_seqlock_irq variant.
7397 * When looking for a bad block we specify a range and want to
7398 * know if any block in the range is bad. So we binary-search
7399 * to the last range that starts at-or-before the given endpoint,
7400 * (or "before the sector after the target range")
7401 * then see if it ends after the given start.
7403 * 0 if there are no known bad blocks in the range
7404 * 1 if there are known bad block which are all acknowledged
7405 * -1 if there are bad blocks which have not yet been acknowledged in metadata.
7406 * plus the start/length of the first bad section we overlap.
7408 int md_is_badblock(struct badblocks *bb, sector_t s, int sectors,
7409 sector_t *first_bad, int *bad_sectors)
7415 sector_t target = s + sectors;
7418 if (bb->shift > 0) {
7419 /* round the start down, and the end up */
7421 target += (1<<bb->shift) - 1;
7422 target >>= bb->shift;
7423 sectors = target - s;
7425 /* 'target' is now the first block after the bad range */
7428 seq = read_seqbegin(&bb->lock);
7432 /* Binary search between lo and hi for 'target'
7433 * i.e. for the last range that starts before 'target'
7435 /* INVARIANT: ranges before 'lo' and at-or-after 'hi'
7436 * are known not to be the last range before target.
7437 * VARIANT: hi-lo is the number of possible
7438 * ranges, and decreases until it reaches 1
7440 while (hi - lo > 1) {
7441 int mid = (lo + hi) / 2;
7442 sector_t a = BB_OFFSET(p[mid]);
7444 /* This could still be the one, earlier ranges
7448 /* This and later ranges are definitely out. */
7451 /* 'lo' might be the last that started before target, but 'hi' isn't */
7453 /* need to check all range that end after 's' to see if
7454 * any are unacknowledged.
7457 BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) {
7458 if (BB_OFFSET(p[lo]) < target) {
7459 /* starts before the end, and finishes after
7460 * the start, so they must overlap
7462 if (rv != -1 && BB_ACK(p[lo]))
7466 *first_bad = BB_OFFSET(p[lo]);
7467 *bad_sectors = BB_LEN(p[lo]);
7473 if (read_seqretry(&bb->lock, seq))
7478 EXPORT_SYMBOL_GPL(md_is_badblock);
7481 * Add a range of bad blocks to the table.
7482 * This might extend the table, or might contract it
7483 * if two adjacent ranges can be merged.
7484 * We binary-search to find the 'insertion' point, then
7485 * decide how best to handle it.
7487 static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors,
7495 /* badblocks are disabled */
7499 /* round the start down, and the end up */
7500 sector_t next = s + sectors;
7502 next += (1<<bb->shift) - 1;
7507 write_seqlock_irq(&bb->lock);
7512 /* Find the last range that starts at-or-before 's' */
7513 while (hi - lo > 1) {
7514 int mid = (lo + hi) / 2;
7515 sector_t a = BB_OFFSET(p[mid]);
7521 if (hi > lo && BB_OFFSET(p[lo]) > s)
7525 /* we found a range that might merge with the start
7528 sector_t a = BB_OFFSET(p[lo]);
7529 sector_t e = a + BB_LEN(p[lo]);
7530 int ack = BB_ACK(p[lo]);
7532 /* Yes, we can merge with a previous range */
7533 if (s == a && s + sectors >= e)
7534 /* new range covers old */
7537 ack = ack && acknowledged;
7539 if (e < s + sectors)
7541 if (e - a <= BB_MAX_LEN) {
7542 p[lo] = BB_MAKE(a, e-a, ack);
7545 /* does not all fit in one range,
7546 * make p[lo] maximal
7548 if (BB_LEN(p[lo]) != BB_MAX_LEN)
7549 p[lo] = BB_MAKE(a, BB_MAX_LEN, ack);
7555 if (sectors && hi < bb->count) {
7556 /* 'hi' points to the first range that starts after 's'.
7557 * Maybe we can merge with the start of that range */
7558 sector_t a = BB_OFFSET(p[hi]);
7559 sector_t e = a + BB_LEN(p[hi]);
7560 int ack = BB_ACK(p[hi]);
7561 if (a <= s + sectors) {
7562 /* merging is possible */
7563 if (e <= s + sectors) {
7568 ack = ack && acknowledged;
7571 if (e - a <= BB_MAX_LEN) {
7572 p[hi] = BB_MAKE(a, e-a, ack);
7575 p[hi] = BB_MAKE(a, BB_MAX_LEN, ack);
7583 if (sectors == 0 && hi < bb->count) {
7584 /* we might be able to combine lo and hi */
7585 /* Note: 's' is at the end of 'lo' */
7586 sector_t a = BB_OFFSET(p[hi]);
7587 int lolen = BB_LEN(p[lo]);
7588 int hilen = BB_LEN(p[hi]);
7589 int newlen = lolen + hilen - (s - a);
7590 if (s >= a && newlen < BB_MAX_LEN) {
7591 /* yes, we can combine them */
7592 int ack = BB_ACK(p[lo]) && BB_ACK(p[hi]);
7593 p[lo] = BB_MAKE(BB_OFFSET(p[lo]), newlen, ack);
7594 memmove(p + hi, p + hi + 1,
7595 (bb->count - hi - 1) * 8);
7600 /* didn't merge (it all).
7601 * Need to add a range just before 'hi' */
7602 if (bb->count >= MD_MAX_BADBLOCKS) {
7603 /* No room for more */
7607 int this_sectors = sectors;
7608 memmove(p + hi + 1, p + hi,
7609 (bb->count - hi) * 8);
7612 if (this_sectors > BB_MAX_LEN)
7613 this_sectors = BB_MAX_LEN;
7614 p[hi] = BB_MAKE(s, this_sectors, acknowledged);
7615 sectors -= this_sectors;
7621 write_sequnlock_irq(&bb->lock);
7626 int rdev_set_badblocks(mdk_rdev_t *rdev, sector_t s, int sectors,
7629 int rv = md_set_badblocks(&rdev->badblocks,
7630 s + rdev->data_offset, sectors, acknowledged);
7632 /* Make sure they get written out promptly */
7633 set_bit(MD_CHANGE_CLEAN, &rdev->mddev->flags);
7634 md_wakeup_thread(rdev->mddev->thread);
7638 EXPORT_SYMBOL_GPL(rdev_set_badblocks);
7641 * Remove a range of bad blocks from the table.
7642 * This may involve extending the table if we spilt a region,
7643 * but it must not fail. So if the table becomes full, we just
7644 * drop the remove request.
7646 static int md_clear_badblocks(struct badblocks *bb, sector_t s, int sectors)
7650 sector_t target = s + sectors;
7653 if (bb->shift > 0) {
7654 /* When clearing we round the start up and the end down.
7655 * This should not matter as the shift should align with
7656 * the block size and no rounding should ever be needed.
7657 * However it is better the think a block is bad when it
7658 * isn't than to think a block is not bad when it is.
7660 s += (1<<bb->shift) - 1;
7662 target >>= bb->shift;
7663 sectors = target - s;
7666 write_seqlock_irq(&bb->lock);
7671 /* Find the last range that starts before 'target' */
7672 while (hi - lo > 1) {
7673 int mid = (lo + hi) / 2;
7674 sector_t a = BB_OFFSET(p[mid]);
7681 /* p[lo] is the last range that could overlap the
7682 * current range. Earlier ranges could also overlap,
7683 * but only this one can overlap the end of the range.
7685 if (BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > target) {
7686 /* Partial overlap, leave the tail of this range */
7687 int ack = BB_ACK(p[lo]);
7688 sector_t a = BB_OFFSET(p[lo]);
7689 sector_t end = a + BB_LEN(p[lo]);
7692 /* we need to split this range */
7693 if (bb->count >= MD_MAX_BADBLOCKS) {
7697 memmove(p+lo+1, p+lo, (bb->count - lo) * 8);
7699 p[lo] = BB_MAKE(a, s-a, ack);
7702 p[lo] = BB_MAKE(target, end - target, ack);
7703 /* there is no longer an overlap */
7708 BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) {
7709 /* This range does overlap */
7710 if (BB_OFFSET(p[lo]) < s) {
7711 /* Keep the early parts of this range. */
7712 int ack = BB_ACK(p[lo]);
7713 sector_t start = BB_OFFSET(p[lo]);
7714 p[lo] = BB_MAKE(start, s - start, ack);
7715 /* now low doesn't overlap, so.. */
7720 /* 'lo' is strictly before, 'hi' is strictly after,
7721 * anything between needs to be discarded
7724 memmove(p+lo+1, p+hi, (bb->count - hi) * 8);
7725 bb->count -= (hi - lo - 1);
7731 write_sequnlock_irq(&bb->lock);
7735 int rdev_clear_badblocks(mdk_rdev_t *rdev, sector_t s, int sectors)
7737 return md_clear_badblocks(&rdev->badblocks,
7738 s + rdev->data_offset,
7741 EXPORT_SYMBOL_GPL(rdev_clear_badblocks);
7744 * Acknowledge all bad blocks in a list.
7745 * This only succeeds if ->changed is clear. It is used by
7746 * in-kernel metadata updates
7748 void md_ack_all_badblocks(struct badblocks *bb)
7750 if (bb->page == NULL || bb->changed)
7751 /* no point even trying */
7753 write_seqlock_irq(&bb->lock);
7755 if (bb->changed == 0) {
7758 for (i = 0; i < bb->count ; i++) {
7759 if (!BB_ACK(p[i])) {
7760 sector_t start = BB_OFFSET(p[i]);
7761 int len = BB_LEN(p[i]);
7762 p[i] = BB_MAKE(start, len, 1);
7766 write_sequnlock_irq(&bb->lock);
7768 EXPORT_SYMBOL_GPL(md_ack_all_badblocks);
7770 /* sysfs access to bad-blocks list.
7771 * We present two files.
7772 * 'bad-blocks' lists sector numbers and lengths of ranges that
7773 * are recorded as bad. The list is truncated to fit within
7774 * the one-page limit of sysfs.
7775 * Writing "sector length" to this file adds an acknowledged
7777 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
7778 * been acknowledged. Writing to this file adds bad blocks
7779 * without acknowledging them. This is largely for testing.
7783 badblocks_show(struct badblocks *bb, char *page, int unack)
7794 seq = read_seqbegin(&bb->lock);
7799 while (len < PAGE_SIZE && i < bb->count) {
7800 sector_t s = BB_OFFSET(p[i]);
7801 unsigned int length = BB_LEN(p[i]);
7802 int ack = BB_ACK(p[i]);
7808 len += snprintf(page+len, PAGE_SIZE-len, "%llu %u\n",
7809 (unsigned long long)s << bb->shift,
7810 length << bb->shift);
7813 if (read_seqretry(&bb->lock, seq))
7822 badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack)
7824 unsigned long long sector;
7828 /* Allow clearing via sysfs *only* for testing/debugging.
7829 * Normally only a successful write may clear a badblock
7832 if (page[0] == '-') {
7836 #endif /* DO_DEBUG */
7838 switch (sscanf(page, "%llu %d%c", §or, &length, &newline)) {
7840 if (newline != '\n')
7852 md_clear_badblocks(bb, sector, length);
7855 #endif /* DO_DEBUG */
7856 if (md_set_badblocks(bb, sector, length, !unack))
7862 static int md_notify_reboot(struct notifier_block *this,
7863 unsigned long code, void *x)
7865 struct list_head *tmp;
7868 if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) {
7870 printk(KERN_INFO "md: stopping all md devices.\n");
7872 for_each_mddev(mddev, tmp)
7873 if (mddev_trylock(mddev)) {
7874 /* Force a switch to readonly even array
7875 * appears to still be in use. Hence
7878 md_set_readonly(mddev, 100);
7879 mddev_unlock(mddev);
7882 * certain more exotic SCSI devices are known to be
7883 * volatile wrt too early system reboots. While the
7884 * right place to handle this issue is the given
7885 * driver, we do want to have a safe RAID driver ...
7892 static struct notifier_block md_notifier = {
7893 .notifier_call = md_notify_reboot,
7895 .priority = INT_MAX, /* before any real devices */
7898 static void md_geninit(void)
7900 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
7902 proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops);
7905 static int __init md_init(void)
7909 md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0);
7913 md_misc_wq = alloc_workqueue("md_misc", 0, 0);
7917 if ((ret = register_blkdev(MD_MAJOR, "md")) < 0)
7920 if ((ret = register_blkdev(0, "mdp")) < 0)
7924 blk_register_region(MKDEV(MD_MAJOR, 0), 1UL<<MINORBITS, THIS_MODULE,
7925 md_probe, NULL, NULL);
7926 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
7927 md_probe, NULL, NULL);
7929 register_reboot_notifier(&md_notifier);
7930 raid_table_header = register_sysctl_table(raid_root_table);
7936 unregister_blkdev(MD_MAJOR, "md");
7938 destroy_workqueue(md_misc_wq);
7940 destroy_workqueue(md_wq);
7948 * Searches all registered partitions for autorun RAID arrays
7952 static LIST_HEAD(all_detected_devices);
7953 struct detected_devices_node {
7954 struct list_head list;
7958 void md_autodetect_dev(dev_t dev)
7960 struct detected_devices_node *node_detected_dev;
7962 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
7963 if (node_detected_dev) {
7964 node_detected_dev->dev = dev;
7965 list_add_tail(&node_detected_dev->list, &all_detected_devices);
7967 printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed"
7968 ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev));
7973 static void autostart_arrays(int part)
7976 struct detected_devices_node *node_detected_dev;
7978 int i_scanned, i_passed;
7983 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
7985 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
7987 node_detected_dev = list_entry(all_detected_devices.next,
7988 struct detected_devices_node, list);
7989 list_del(&node_detected_dev->list);
7990 dev = node_detected_dev->dev;
7991 kfree(node_detected_dev);
7992 rdev = md_import_device(dev,0, 90);
7996 if (test_bit(Faulty, &rdev->flags)) {
8000 set_bit(AutoDetected, &rdev->flags);
8001 list_add(&rdev->same_set, &pending_raid_disks);
8005 printk(KERN_INFO "md: Scanned %d and added %d devices.\n",
8006 i_scanned, i_passed);
8008 autorun_devices(part);
8011 #endif /* !MODULE */
8013 static __exit void md_exit(void)
8016 struct list_head *tmp;
8018 blk_unregister_region(MKDEV(MD_MAJOR,0), 1U << MINORBITS);
8019 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
8021 unregister_blkdev(MD_MAJOR,"md");
8022 unregister_blkdev(mdp_major, "mdp");
8023 unregister_reboot_notifier(&md_notifier);
8024 unregister_sysctl_table(raid_table_header);
8025 remove_proc_entry("mdstat", NULL);
8026 for_each_mddev(mddev, tmp) {
8027 export_array(mddev);
8028 mddev->hold_active = 0;
8030 destroy_workqueue(md_misc_wq);
8031 destroy_workqueue(md_wq);
8034 subsys_initcall(md_init);
8035 module_exit(md_exit)
8037 static int get_ro(char *buffer, struct kernel_param *kp)
8039 return sprintf(buffer, "%d", start_readonly);
8041 static int set_ro(const char *val, struct kernel_param *kp)
8044 int num = simple_strtoul(val, &e, 10);
8045 if (*val && (*e == '\0' || *e == '\n')) {
8046 start_readonly = num;
8052 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
8053 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
8055 module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR);
8057 EXPORT_SYMBOL(register_md_personality);
8058 EXPORT_SYMBOL(unregister_md_personality);
8059 EXPORT_SYMBOL(md_error);
8060 EXPORT_SYMBOL(md_done_sync);
8061 EXPORT_SYMBOL(md_write_start);
8062 EXPORT_SYMBOL(md_write_end);
8063 EXPORT_SYMBOL(md_register_thread);
8064 EXPORT_SYMBOL(md_unregister_thread);
8065 EXPORT_SYMBOL(md_wakeup_thread);
8066 EXPORT_SYMBOL(md_check_recovery);
8067 MODULE_LICENSE("GPL");
8068 MODULE_DESCRIPTION("MD RAID framework");
8070 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);