2 md.c : Multiple Devices driver for Linux
3 Copyright (C) 1998, 1999, 2000 Ingo Molnar
5 completely rewritten, based on the MD driver code from Marc Zyngier
9 - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar
10 - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com>
11 - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net>
12 - kerneld support by Boris Tobotras <boris@xtalk.msk.su>
13 - kmod support by: Cyrus Durgin
14 - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com>
15 - Devfs support by Richard Gooch <rgooch@atnf.csiro.au>
17 - lots of fixes and improvements to the RAID1/RAID5 and generic
18 RAID code (such as request based resynchronization):
20 Neil Brown <neilb@cse.unsw.edu.au>.
22 - persistent bitmap code
23 Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.
25 This program is free software; you can redistribute it and/or modify
26 it under the terms of the GNU General Public License as published by
27 the Free Software Foundation; either version 2, or (at your option)
30 You should have received a copy of the GNU General Public License
31 (for example /usr/src/linux/COPYING); if not, write to the Free
32 Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
35 #include <linux/kthread.h>
36 #include <linux/blkdev.h>
37 #include <linux/sysctl.h>
38 #include <linux/seq_file.h>
40 #include <linux/poll.h>
41 #include <linux/ctype.h>
42 #include <linux/string.h>
43 #include <linux/hdreg.h>
44 #include <linux/proc_fs.h>
45 #include <linux/random.h>
46 #include <linux/module.h>
47 #include <linux/reboot.h>
48 #include <linux/file.h>
49 #include <linux/compat.h>
50 #include <linux/delay.h>
51 #include <linux/raid/md_p.h>
52 #include <linux/raid/md_u.h>
53 #include <linux/slab.h>
58 static void autostart_arrays(int part);
61 /* pers_list is a list of registered personalities protected
63 * pers_lock does extra service to protect accesses to
64 * mddev->thread when the mutex cannot be held.
66 static LIST_HEAD(pers_list);
67 static DEFINE_SPINLOCK(pers_lock);
69 static void md_print_devices(void);
71 static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
72 static struct workqueue_struct *md_wq;
73 static struct workqueue_struct *md_misc_wq;
75 #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
78 * Default number of read corrections we'll attempt on an rdev
79 * before ejecting it from the array. We divide the read error
80 * count by 2 for every hour elapsed between read errors.
82 #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
84 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
85 * is 1000 KB/sec, so the extra system load does not show up that much.
86 * Increase it if you want to have more _guaranteed_ speed. Note that
87 * the RAID driver will use the maximum available bandwidth if the IO
88 * subsystem is idle. There is also an 'absolute maximum' reconstruction
89 * speed limit - in case reconstruction slows down your system despite
92 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
93 * or /sys/block/mdX/md/sync_speed_{min,max}
96 static int sysctl_speed_limit_min = 1000;
97 static int sysctl_speed_limit_max = 200000;
98 static inline int speed_min(struct mddev *mddev)
100 return mddev->sync_speed_min ?
101 mddev->sync_speed_min : sysctl_speed_limit_min;
104 static inline int speed_max(struct mddev *mddev)
106 return mddev->sync_speed_max ?
107 mddev->sync_speed_max : sysctl_speed_limit_max;
110 static struct ctl_table_header *raid_table_header;
112 static ctl_table raid_table[] = {
114 .procname = "speed_limit_min",
115 .data = &sysctl_speed_limit_min,
116 .maxlen = sizeof(int),
117 .mode = S_IRUGO|S_IWUSR,
118 .proc_handler = proc_dointvec,
121 .procname = "speed_limit_max",
122 .data = &sysctl_speed_limit_max,
123 .maxlen = sizeof(int),
124 .mode = S_IRUGO|S_IWUSR,
125 .proc_handler = proc_dointvec,
130 static ctl_table raid_dir_table[] = {
134 .mode = S_IRUGO|S_IXUGO,
140 static ctl_table raid_root_table[] = {
145 .child = raid_dir_table,
150 static const struct block_device_operations md_fops;
152 static int start_readonly;
155 * like bio_clone, but with a local bio set
158 struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs,
163 if (!mddev || !mddev->bio_set)
164 return bio_alloc(gfp_mask, nr_iovecs);
166 b = bio_alloc_bioset(gfp_mask, nr_iovecs, mddev->bio_set);
171 EXPORT_SYMBOL_GPL(bio_alloc_mddev);
173 struct bio *bio_clone_mddev(struct bio *bio, gfp_t gfp_mask,
176 if (!mddev || !mddev->bio_set)
177 return bio_clone(bio, gfp_mask);
179 return bio_clone_bioset(bio, gfp_mask, mddev->bio_set);
181 EXPORT_SYMBOL_GPL(bio_clone_mddev);
183 void md_trim_bio(struct bio *bio, int offset, int size)
185 /* 'bio' is a cloned bio which we need to trim to match
186 * the given offset and size.
187 * This requires adjusting bi_sector, bi_size, and bi_io_vec
190 struct bio_vec *bvec;
194 if (offset == 0 && size == bio->bi_size)
197 clear_bit(BIO_SEG_VALID, &bio->bi_flags);
199 bio_advance(bio, offset << 9);
203 /* avoid any complications with bi_idx being non-zero*/
205 memmove(bio->bi_io_vec, bio->bi_io_vec+bio->bi_idx,
206 (bio->bi_vcnt - bio->bi_idx) * sizeof(struct bio_vec));
207 bio->bi_vcnt -= bio->bi_idx;
210 /* Make sure vcnt and last bv are not too big */
211 bio_for_each_segment(bvec, bio, i) {
212 if (sofar + bvec->bv_len > size)
213 bvec->bv_len = size - sofar;
214 if (bvec->bv_len == 0) {
218 sofar += bvec->bv_len;
221 EXPORT_SYMBOL_GPL(md_trim_bio);
224 * We have a system wide 'event count' that is incremented
225 * on any 'interesting' event, and readers of /proc/mdstat
226 * can use 'poll' or 'select' to find out when the event
230 * start array, stop array, error, add device, remove device,
231 * start build, activate spare
233 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
234 static atomic_t md_event_count;
235 void md_new_event(struct mddev *mddev)
237 atomic_inc(&md_event_count);
238 wake_up(&md_event_waiters);
240 EXPORT_SYMBOL_GPL(md_new_event);
242 /* Alternate version that can be called from interrupts
243 * when calling sysfs_notify isn't needed.
245 static void md_new_event_inintr(struct mddev *mddev)
247 atomic_inc(&md_event_count);
248 wake_up(&md_event_waiters);
252 * Enables to iterate over all existing md arrays
253 * all_mddevs_lock protects this list.
255 static LIST_HEAD(all_mddevs);
256 static DEFINE_SPINLOCK(all_mddevs_lock);
260 * iterates through all used mddevs in the system.
261 * We take care to grab the all_mddevs_lock whenever navigating
262 * the list, and to always hold a refcount when unlocked.
263 * Any code which breaks out of this loop while own
264 * a reference to the current mddev and must mddev_put it.
266 #define for_each_mddev(_mddev,_tmp) \
268 for (({ spin_lock(&all_mddevs_lock); \
269 _tmp = all_mddevs.next; \
271 ({ if (_tmp != &all_mddevs) \
272 mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\
273 spin_unlock(&all_mddevs_lock); \
274 if (_mddev) mddev_put(_mddev); \
275 _mddev = list_entry(_tmp, struct mddev, all_mddevs); \
276 _tmp != &all_mddevs;}); \
277 ({ spin_lock(&all_mddevs_lock); \
278 _tmp = _tmp->next;}) \
282 /* Rather than calling directly into the personality make_request function,
283 * IO requests come here first so that we can check if the device is
284 * being suspended pending a reconfiguration.
285 * We hold a refcount over the call to ->make_request. By the time that
286 * call has finished, the bio has been linked into some internal structure
287 * and so is visible to ->quiesce(), so we don't need the refcount any more.
289 static void md_make_request(struct request_queue *q, struct bio *bio)
291 const int rw = bio_data_dir(bio);
292 struct mddev *mddev = q->queuedata;
294 unsigned int sectors;
296 if (mddev == NULL || mddev->pers == NULL
301 if (mddev->ro == 1 && unlikely(rw == WRITE)) {
302 bio_endio(bio, bio_sectors(bio) == 0 ? 0 : -EROFS);
305 smp_rmb(); /* Ensure implications of 'active' are visible */
307 if (mddev->suspended) {
310 prepare_to_wait(&mddev->sb_wait, &__wait,
311 TASK_UNINTERRUPTIBLE);
312 if (!mddev->suspended)
318 finish_wait(&mddev->sb_wait, &__wait);
320 atomic_inc(&mddev->active_io);
324 * save the sectors now since our bio can
325 * go away inside make_request
327 sectors = bio_sectors(bio);
328 mddev->pers->make_request(mddev, bio);
330 cpu = part_stat_lock();
331 part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]);
332 part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw], sectors);
335 if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended)
336 wake_up(&mddev->sb_wait);
339 /* mddev_suspend makes sure no new requests are submitted
340 * to the device, and that any requests that have been submitted
341 * are completely handled.
342 * Once ->stop is called and completes, the module will be completely
345 void mddev_suspend(struct mddev *mddev)
347 BUG_ON(mddev->suspended);
348 mddev->suspended = 1;
350 wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0);
351 mddev->pers->quiesce(mddev, 1);
353 del_timer_sync(&mddev->safemode_timer);
355 EXPORT_SYMBOL_GPL(mddev_suspend);
357 void mddev_resume(struct mddev *mddev)
359 mddev->suspended = 0;
360 wake_up(&mddev->sb_wait);
361 mddev->pers->quiesce(mddev, 0);
363 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
364 md_wakeup_thread(mddev->thread);
365 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
367 EXPORT_SYMBOL_GPL(mddev_resume);
369 int mddev_congested(struct mddev *mddev, int bits)
371 return mddev->suspended;
373 EXPORT_SYMBOL(mddev_congested);
376 * Generic flush handling for md
379 static void md_end_flush(struct bio *bio, int err)
381 struct md_rdev *rdev = bio->bi_private;
382 struct mddev *mddev = rdev->mddev;
384 rdev_dec_pending(rdev, mddev);
386 if (atomic_dec_and_test(&mddev->flush_pending)) {
387 /* The pre-request flush has finished */
388 queue_work(md_wq, &mddev->flush_work);
393 static void md_submit_flush_data(struct work_struct *ws);
395 static void submit_flushes(struct work_struct *ws)
397 struct mddev *mddev = container_of(ws, struct mddev, flush_work);
398 struct md_rdev *rdev;
400 INIT_WORK(&mddev->flush_work, md_submit_flush_data);
401 atomic_set(&mddev->flush_pending, 1);
403 rdev_for_each_rcu(rdev, mddev)
404 if (rdev->raid_disk >= 0 &&
405 !test_bit(Faulty, &rdev->flags)) {
406 /* Take two references, one is dropped
407 * when request finishes, one after
408 * we reclaim rcu_read_lock
411 atomic_inc(&rdev->nr_pending);
412 atomic_inc(&rdev->nr_pending);
414 bi = bio_alloc_mddev(GFP_NOIO, 0, mddev);
415 bi->bi_end_io = md_end_flush;
416 bi->bi_private = rdev;
417 bi->bi_bdev = rdev->bdev;
418 atomic_inc(&mddev->flush_pending);
419 submit_bio(WRITE_FLUSH, bi);
421 rdev_dec_pending(rdev, mddev);
424 if (atomic_dec_and_test(&mddev->flush_pending))
425 queue_work(md_wq, &mddev->flush_work);
428 static void md_submit_flush_data(struct work_struct *ws)
430 struct mddev *mddev = container_of(ws, struct mddev, flush_work);
431 struct bio *bio = mddev->flush_bio;
433 if (bio->bi_size == 0)
434 /* an empty barrier - all done */
437 bio->bi_rw &= ~REQ_FLUSH;
438 mddev->pers->make_request(mddev, bio);
441 mddev->flush_bio = NULL;
442 wake_up(&mddev->sb_wait);
445 void md_flush_request(struct mddev *mddev, struct bio *bio)
447 spin_lock_irq(&mddev->write_lock);
448 wait_event_lock_irq(mddev->sb_wait,
451 mddev->flush_bio = bio;
452 spin_unlock_irq(&mddev->write_lock);
454 INIT_WORK(&mddev->flush_work, submit_flushes);
455 queue_work(md_wq, &mddev->flush_work);
457 EXPORT_SYMBOL(md_flush_request);
459 void md_unplug(struct blk_plug_cb *cb, bool from_schedule)
461 struct mddev *mddev = cb->data;
462 md_wakeup_thread(mddev->thread);
465 EXPORT_SYMBOL(md_unplug);
467 static inline struct mddev *mddev_get(struct mddev *mddev)
469 atomic_inc(&mddev->active);
473 static void mddev_delayed_delete(struct work_struct *ws);
475 static void mddev_put(struct mddev *mddev)
477 struct bio_set *bs = NULL;
479 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
481 if (!mddev->raid_disks && list_empty(&mddev->disks) &&
482 mddev->ctime == 0 && !mddev->hold_active) {
483 /* Array is not configured at all, and not held active,
485 list_del_init(&mddev->all_mddevs);
487 mddev->bio_set = NULL;
488 if (mddev->gendisk) {
489 /* We did a probe so need to clean up. Call
490 * queue_work inside the spinlock so that
491 * flush_workqueue() after mddev_find will
492 * succeed in waiting for the work to be done.
494 INIT_WORK(&mddev->del_work, mddev_delayed_delete);
495 queue_work(md_misc_wq, &mddev->del_work);
499 spin_unlock(&all_mddevs_lock);
504 void mddev_init(struct mddev *mddev)
506 mutex_init(&mddev->open_mutex);
507 mutex_init(&mddev->reconfig_mutex);
508 mutex_init(&mddev->bitmap_info.mutex);
509 INIT_LIST_HEAD(&mddev->disks);
510 INIT_LIST_HEAD(&mddev->all_mddevs);
511 init_timer(&mddev->safemode_timer);
512 atomic_set(&mddev->active, 1);
513 atomic_set(&mddev->openers, 0);
514 atomic_set(&mddev->active_io, 0);
515 spin_lock_init(&mddev->write_lock);
516 atomic_set(&mddev->flush_pending, 0);
517 init_waitqueue_head(&mddev->sb_wait);
518 init_waitqueue_head(&mddev->recovery_wait);
519 mddev->reshape_position = MaxSector;
520 mddev->reshape_backwards = 0;
521 mddev->resync_min = 0;
522 mddev->resync_max = MaxSector;
523 mddev->level = LEVEL_NONE;
525 EXPORT_SYMBOL_GPL(mddev_init);
527 static struct mddev * mddev_find(dev_t unit)
529 struct mddev *mddev, *new = NULL;
531 if (unit && MAJOR(unit) != MD_MAJOR)
532 unit &= ~((1<<MdpMinorShift)-1);
535 spin_lock(&all_mddevs_lock);
538 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
539 if (mddev->unit == unit) {
541 spin_unlock(&all_mddevs_lock);
547 list_add(&new->all_mddevs, &all_mddevs);
548 spin_unlock(&all_mddevs_lock);
549 new->hold_active = UNTIL_IOCTL;
553 /* find an unused unit number */
554 static int next_minor = 512;
555 int start = next_minor;
559 dev = MKDEV(MD_MAJOR, next_minor);
561 if (next_minor > MINORMASK)
563 if (next_minor == start) {
564 /* Oh dear, all in use. */
565 spin_unlock(&all_mddevs_lock);
571 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
572 if (mddev->unit == dev) {
578 new->md_minor = MINOR(dev);
579 new->hold_active = UNTIL_STOP;
580 list_add(&new->all_mddevs, &all_mddevs);
581 spin_unlock(&all_mddevs_lock);
584 spin_unlock(&all_mddevs_lock);
586 new = kzalloc(sizeof(*new), GFP_KERNEL);
591 if (MAJOR(unit) == MD_MAJOR)
592 new->md_minor = MINOR(unit);
594 new->md_minor = MINOR(unit) >> MdpMinorShift;
601 static inline int mddev_lock(struct mddev * mddev)
603 return mutex_lock_interruptible(&mddev->reconfig_mutex);
606 static inline int mddev_is_locked(struct mddev *mddev)
608 return mutex_is_locked(&mddev->reconfig_mutex);
611 static inline int mddev_trylock(struct mddev * mddev)
613 return mutex_trylock(&mddev->reconfig_mutex);
616 static struct attribute_group md_redundancy_group;
618 static void mddev_unlock(struct mddev * mddev)
620 if (mddev->to_remove) {
621 /* These cannot be removed under reconfig_mutex as
622 * an access to the files will try to take reconfig_mutex
623 * while holding the file unremovable, which leads to
625 * So hold set sysfs_active while the remove in happeing,
626 * and anything else which might set ->to_remove or my
627 * otherwise change the sysfs namespace will fail with
628 * -EBUSY if sysfs_active is still set.
629 * We set sysfs_active under reconfig_mutex and elsewhere
630 * test it under the same mutex to ensure its correct value
633 struct attribute_group *to_remove = mddev->to_remove;
634 mddev->to_remove = NULL;
635 mddev->sysfs_active = 1;
636 mutex_unlock(&mddev->reconfig_mutex);
638 if (mddev->kobj.sd) {
639 if (to_remove != &md_redundancy_group)
640 sysfs_remove_group(&mddev->kobj, to_remove);
641 if (mddev->pers == NULL ||
642 mddev->pers->sync_request == NULL) {
643 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
644 if (mddev->sysfs_action)
645 sysfs_put(mddev->sysfs_action);
646 mddev->sysfs_action = NULL;
649 mddev->sysfs_active = 0;
651 mutex_unlock(&mddev->reconfig_mutex);
653 /* As we've dropped the mutex we need a spinlock to
654 * make sure the thread doesn't disappear
656 spin_lock(&pers_lock);
657 md_wakeup_thread(mddev->thread);
658 spin_unlock(&pers_lock);
661 static struct md_rdev * find_rdev_nr(struct mddev *mddev, int nr)
663 struct md_rdev *rdev;
665 rdev_for_each(rdev, mddev)
666 if (rdev->desc_nr == nr)
672 static struct md_rdev *find_rdev_nr_rcu(struct mddev *mddev, int nr)
674 struct md_rdev *rdev;
676 rdev_for_each_rcu(rdev, mddev)
677 if (rdev->desc_nr == nr)
683 static struct md_rdev *find_rdev(struct mddev *mddev, dev_t dev)
685 struct md_rdev *rdev;
687 rdev_for_each(rdev, mddev)
688 if (rdev->bdev->bd_dev == dev)
694 static struct md_rdev *find_rdev_rcu(struct mddev *mddev, dev_t dev)
696 struct md_rdev *rdev;
698 rdev_for_each_rcu(rdev, mddev)
699 if (rdev->bdev->bd_dev == dev)
705 static struct md_personality *find_pers(int level, char *clevel)
707 struct md_personality *pers;
708 list_for_each_entry(pers, &pers_list, list) {
709 if (level != LEVEL_NONE && pers->level == level)
711 if (strcmp(pers->name, clevel)==0)
717 /* return the offset of the super block in 512byte sectors */
718 static inline sector_t calc_dev_sboffset(struct md_rdev *rdev)
720 sector_t num_sectors = i_size_read(rdev->bdev->bd_inode) / 512;
721 return MD_NEW_SIZE_SECTORS(num_sectors);
724 static int alloc_disk_sb(struct md_rdev * rdev)
729 rdev->sb_page = alloc_page(GFP_KERNEL);
730 if (!rdev->sb_page) {
731 printk(KERN_ALERT "md: out of memory.\n");
738 void md_rdev_clear(struct md_rdev *rdev)
741 put_page(rdev->sb_page);
743 rdev->sb_page = NULL;
748 put_page(rdev->bb_page);
749 rdev->bb_page = NULL;
751 kfree(rdev->badblocks.page);
752 rdev->badblocks.page = NULL;
754 EXPORT_SYMBOL_GPL(md_rdev_clear);
756 static void super_written(struct bio *bio, int error)
758 struct md_rdev *rdev = bio->bi_private;
759 struct mddev *mddev = rdev->mddev;
761 if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) {
762 printk("md: super_written gets error=%d, uptodate=%d\n",
763 error, test_bit(BIO_UPTODATE, &bio->bi_flags));
764 WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags));
765 md_error(mddev, rdev);
768 if (atomic_dec_and_test(&mddev->pending_writes))
769 wake_up(&mddev->sb_wait);
773 void md_super_write(struct mddev *mddev, struct md_rdev *rdev,
774 sector_t sector, int size, struct page *page)
776 /* write first size bytes of page to sector of rdev
777 * Increment mddev->pending_writes before returning
778 * and decrement it on completion, waking up sb_wait
779 * if zero is reached.
780 * If an error occurred, call md_error
782 struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, mddev);
784 bio->bi_bdev = rdev->meta_bdev ? rdev->meta_bdev : rdev->bdev;
785 bio->bi_sector = sector;
786 bio_add_page(bio, page, size, 0);
787 bio->bi_private = rdev;
788 bio->bi_end_io = super_written;
790 atomic_inc(&mddev->pending_writes);
791 submit_bio(WRITE_FLUSH_FUA, bio);
794 void md_super_wait(struct mddev *mddev)
796 /* wait for all superblock writes that were scheduled to complete */
799 prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE);
800 if (atomic_read(&mddev->pending_writes)==0)
804 finish_wait(&mddev->sb_wait, &wq);
807 static void bi_complete(struct bio *bio, int error)
809 complete((struct completion*)bio->bi_private);
812 int sync_page_io(struct md_rdev *rdev, sector_t sector, int size,
813 struct page *page, int rw, bool metadata_op)
815 struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, rdev->mddev);
816 struct completion event;
821 bio->bi_bdev = (metadata_op && rdev->meta_bdev) ?
822 rdev->meta_bdev : rdev->bdev;
824 bio->bi_sector = sector + rdev->sb_start;
825 else if (rdev->mddev->reshape_position != MaxSector &&
826 (rdev->mddev->reshape_backwards ==
827 (sector >= rdev->mddev->reshape_position)))
828 bio->bi_sector = sector + rdev->new_data_offset;
830 bio->bi_sector = sector + rdev->data_offset;
831 bio_add_page(bio, page, size, 0);
832 init_completion(&event);
833 bio->bi_private = &event;
834 bio->bi_end_io = bi_complete;
836 wait_for_completion(&event);
838 ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
842 EXPORT_SYMBOL_GPL(sync_page_io);
844 static int read_disk_sb(struct md_rdev * rdev, int size)
846 char b[BDEVNAME_SIZE];
847 if (!rdev->sb_page) {
855 if (!sync_page_io(rdev, 0, size, rdev->sb_page, READ, true))
861 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
862 bdevname(rdev->bdev,b));
866 static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
868 return sb1->set_uuid0 == sb2->set_uuid0 &&
869 sb1->set_uuid1 == sb2->set_uuid1 &&
870 sb1->set_uuid2 == sb2->set_uuid2 &&
871 sb1->set_uuid3 == sb2->set_uuid3;
874 static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
877 mdp_super_t *tmp1, *tmp2;
879 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
880 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
882 if (!tmp1 || !tmp2) {
884 printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n");
892 * nr_disks is not constant
897 ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0);
905 static u32 md_csum_fold(u32 csum)
907 csum = (csum & 0xffff) + (csum >> 16);
908 return (csum & 0xffff) + (csum >> 16);
911 static unsigned int calc_sb_csum(mdp_super_t * sb)
914 u32 *sb32 = (u32*)sb;
916 unsigned int disk_csum, csum;
918 disk_csum = sb->sb_csum;
921 for (i = 0; i < MD_SB_BYTES/4 ; i++)
923 csum = (newcsum & 0xffffffff) + (newcsum>>32);
927 /* This used to use csum_partial, which was wrong for several
928 * reasons including that different results are returned on
929 * different architectures. It isn't critical that we get exactly
930 * the same return value as before (we always csum_fold before
931 * testing, and that removes any differences). However as we
932 * know that csum_partial always returned a 16bit value on
933 * alphas, do a fold to maximise conformity to previous behaviour.
935 sb->sb_csum = md_csum_fold(disk_csum);
937 sb->sb_csum = disk_csum;
944 * Handle superblock details.
945 * We want to be able to handle multiple superblock formats
946 * so we have a common interface to them all, and an array of
947 * different handlers.
948 * We rely on user-space to write the initial superblock, and support
949 * reading and updating of superblocks.
950 * Interface methods are:
951 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version)
952 * loads and validates a superblock on dev.
953 * if refdev != NULL, compare superblocks on both devices
955 * 0 - dev has a superblock that is compatible with refdev
956 * 1 - dev has a superblock that is compatible and newer than refdev
957 * so dev should be used as the refdev in future
958 * -EINVAL superblock incompatible or invalid
959 * -othererror e.g. -EIO
961 * int validate_super(struct mddev *mddev, struct md_rdev *dev)
962 * Verify that dev is acceptable into mddev.
963 * The first time, mddev->raid_disks will be 0, and data from
964 * dev should be merged in. Subsequent calls check that dev
965 * is new enough. Return 0 or -EINVAL
967 * void sync_super(struct mddev *mddev, struct md_rdev *dev)
968 * Update the superblock for rdev with data in mddev
969 * This does not write to disc.
975 struct module *owner;
976 int (*load_super)(struct md_rdev *rdev,
977 struct md_rdev *refdev,
979 int (*validate_super)(struct mddev *mddev,
980 struct md_rdev *rdev);
981 void (*sync_super)(struct mddev *mddev,
982 struct md_rdev *rdev);
983 unsigned long long (*rdev_size_change)(struct md_rdev *rdev,
984 sector_t num_sectors);
985 int (*allow_new_offset)(struct md_rdev *rdev,
986 unsigned long long new_offset);
990 * Check that the given mddev has no bitmap.
992 * This function is called from the run method of all personalities that do not
993 * support bitmaps. It prints an error message and returns non-zero if mddev
994 * has a bitmap. Otherwise, it returns 0.
997 int md_check_no_bitmap(struct mddev *mddev)
999 if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset)
1001 printk(KERN_ERR "%s: bitmaps are not supported for %s\n",
1002 mdname(mddev), mddev->pers->name);
1005 EXPORT_SYMBOL(md_check_no_bitmap);
1008 * load_super for 0.90.0
1010 static int super_90_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
1012 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1017 * Calculate the position of the superblock (512byte sectors),
1018 * it's at the end of the disk.
1020 * It also happens to be a multiple of 4Kb.
1022 rdev->sb_start = calc_dev_sboffset(rdev);
1024 ret = read_disk_sb(rdev, MD_SB_BYTES);
1025 if (ret) return ret;
1029 bdevname(rdev->bdev, b);
1030 sb = page_address(rdev->sb_page);
1032 if (sb->md_magic != MD_SB_MAGIC) {
1033 printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
1038 if (sb->major_version != 0 ||
1039 sb->minor_version < 90 ||
1040 sb->minor_version > 91) {
1041 printk(KERN_WARNING "Bad version number %d.%d on %s\n",
1042 sb->major_version, sb->minor_version,
1047 if (sb->raid_disks <= 0)
1050 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
1051 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
1056 rdev->preferred_minor = sb->md_minor;
1057 rdev->data_offset = 0;
1058 rdev->new_data_offset = 0;
1059 rdev->sb_size = MD_SB_BYTES;
1060 rdev->badblocks.shift = -1;
1062 if (sb->level == LEVEL_MULTIPATH)
1065 rdev->desc_nr = sb->this_disk.number;
1071 mdp_super_t *refsb = page_address(refdev->sb_page);
1072 if (!uuid_equal(refsb, sb)) {
1073 printk(KERN_WARNING "md: %s has different UUID to %s\n",
1074 b, bdevname(refdev->bdev,b2));
1077 if (!sb_equal(refsb, sb)) {
1078 printk(KERN_WARNING "md: %s has same UUID"
1079 " but different superblock to %s\n",
1080 b, bdevname(refdev->bdev, b2));
1084 ev2 = md_event(refsb);
1090 rdev->sectors = rdev->sb_start;
1091 /* Limit to 4TB as metadata cannot record more than that.
1092 * (not needed for Linear and RAID0 as metadata doesn't
1095 if (rdev->sectors >= (2ULL << 32) && sb->level >= 1)
1096 rdev->sectors = (2ULL << 32) - 2;
1098 if (rdev->sectors < ((sector_t)sb->size) * 2 && sb->level >= 1)
1099 /* "this cannot possibly happen" ... */
1107 * validate_super for 0.90.0
1109 static int super_90_validate(struct mddev *mddev, struct md_rdev *rdev)
1112 mdp_super_t *sb = page_address(rdev->sb_page);
1113 __u64 ev1 = md_event(sb);
1115 rdev->raid_disk = -1;
1116 clear_bit(Faulty, &rdev->flags);
1117 clear_bit(In_sync, &rdev->flags);
1118 clear_bit(WriteMostly, &rdev->flags);
1120 if (mddev->raid_disks == 0) {
1121 mddev->major_version = 0;
1122 mddev->minor_version = sb->minor_version;
1123 mddev->patch_version = sb->patch_version;
1124 mddev->external = 0;
1125 mddev->chunk_sectors = sb->chunk_size >> 9;
1126 mddev->ctime = sb->ctime;
1127 mddev->utime = sb->utime;
1128 mddev->level = sb->level;
1129 mddev->clevel[0] = 0;
1130 mddev->layout = sb->layout;
1131 mddev->raid_disks = sb->raid_disks;
1132 mddev->dev_sectors = ((sector_t)sb->size) * 2;
1133 mddev->events = ev1;
1134 mddev->bitmap_info.offset = 0;
1135 mddev->bitmap_info.space = 0;
1136 /* bitmap can use 60 K after the 4K superblocks */
1137 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
1138 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
1139 mddev->reshape_backwards = 0;
1141 if (mddev->minor_version >= 91) {
1142 mddev->reshape_position = sb->reshape_position;
1143 mddev->delta_disks = sb->delta_disks;
1144 mddev->new_level = sb->new_level;
1145 mddev->new_layout = sb->new_layout;
1146 mddev->new_chunk_sectors = sb->new_chunk >> 9;
1147 if (mddev->delta_disks < 0)
1148 mddev->reshape_backwards = 1;
1150 mddev->reshape_position = MaxSector;
1151 mddev->delta_disks = 0;
1152 mddev->new_level = mddev->level;
1153 mddev->new_layout = mddev->layout;
1154 mddev->new_chunk_sectors = mddev->chunk_sectors;
1157 if (sb->state & (1<<MD_SB_CLEAN))
1158 mddev->recovery_cp = MaxSector;
1160 if (sb->events_hi == sb->cp_events_hi &&
1161 sb->events_lo == sb->cp_events_lo) {
1162 mddev->recovery_cp = sb->recovery_cp;
1164 mddev->recovery_cp = 0;
1167 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
1168 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
1169 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
1170 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
1172 mddev->max_disks = MD_SB_DISKS;
1174 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
1175 mddev->bitmap_info.file == NULL) {
1176 mddev->bitmap_info.offset =
1177 mddev->bitmap_info.default_offset;
1178 mddev->bitmap_info.space =
1179 mddev->bitmap_info.space;
1182 } else if (mddev->pers == NULL) {
1183 /* Insist on good event counter while assembling, except
1184 * for spares (which don't need an event count) */
1186 if (sb->disks[rdev->desc_nr].state & (
1187 (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE)))
1188 if (ev1 < mddev->events)
1190 } else if (mddev->bitmap) {
1191 /* if adding to array with a bitmap, then we can accept an
1192 * older device ... but not too old.
1194 if (ev1 < mddev->bitmap->events_cleared)
1197 if (ev1 < mddev->events)
1198 /* just a hot-add of a new device, leave raid_disk at -1 */
1202 if (mddev->level != LEVEL_MULTIPATH) {
1203 desc = sb->disks + rdev->desc_nr;
1205 if (desc->state & (1<<MD_DISK_FAULTY))
1206 set_bit(Faulty, &rdev->flags);
1207 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
1208 desc->raid_disk < mddev->raid_disks */) {
1209 set_bit(In_sync, &rdev->flags);
1210 rdev->raid_disk = desc->raid_disk;
1211 } else if (desc->state & (1<<MD_DISK_ACTIVE)) {
1212 /* active but not in sync implies recovery up to
1213 * reshape position. We don't know exactly where
1214 * that is, so set to zero for now */
1215 if (mddev->minor_version >= 91) {
1216 rdev->recovery_offset = 0;
1217 rdev->raid_disk = desc->raid_disk;
1220 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
1221 set_bit(WriteMostly, &rdev->flags);
1222 } else /* MULTIPATH are always insync */
1223 set_bit(In_sync, &rdev->flags);
1228 * sync_super for 0.90.0
1230 static void super_90_sync(struct mddev *mddev, struct md_rdev *rdev)
1233 struct md_rdev *rdev2;
1234 int next_spare = mddev->raid_disks;
1237 /* make rdev->sb match mddev data..
1240 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1241 * 3/ any empty disks < next_spare become removed
1243 * disks[0] gets initialised to REMOVED because
1244 * we cannot be sure from other fields if it has
1245 * been initialised or not.
1248 int active=0, working=0,failed=0,spare=0,nr_disks=0;
1250 rdev->sb_size = MD_SB_BYTES;
1252 sb = page_address(rdev->sb_page);
1254 memset(sb, 0, sizeof(*sb));
1256 sb->md_magic = MD_SB_MAGIC;
1257 sb->major_version = mddev->major_version;
1258 sb->patch_version = mddev->patch_version;
1259 sb->gvalid_words = 0; /* ignored */
1260 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
1261 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
1262 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
1263 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
1265 sb->ctime = mddev->ctime;
1266 sb->level = mddev->level;
1267 sb->size = mddev->dev_sectors / 2;
1268 sb->raid_disks = mddev->raid_disks;
1269 sb->md_minor = mddev->md_minor;
1270 sb->not_persistent = 0;
1271 sb->utime = mddev->utime;
1273 sb->events_hi = (mddev->events>>32);
1274 sb->events_lo = (u32)mddev->events;
1276 if (mddev->reshape_position == MaxSector)
1277 sb->minor_version = 90;
1279 sb->minor_version = 91;
1280 sb->reshape_position = mddev->reshape_position;
1281 sb->new_level = mddev->new_level;
1282 sb->delta_disks = mddev->delta_disks;
1283 sb->new_layout = mddev->new_layout;
1284 sb->new_chunk = mddev->new_chunk_sectors << 9;
1286 mddev->minor_version = sb->minor_version;
1289 sb->recovery_cp = mddev->recovery_cp;
1290 sb->cp_events_hi = (mddev->events>>32);
1291 sb->cp_events_lo = (u32)mddev->events;
1292 if (mddev->recovery_cp == MaxSector)
1293 sb->state = (1<< MD_SB_CLEAN);
1295 sb->recovery_cp = 0;
1297 sb->layout = mddev->layout;
1298 sb->chunk_size = mddev->chunk_sectors << 9;
1300 if (mddev->bitmap && mddev->bitmap_info.file == NULL)
1301 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
1303 sb->disks[0].state = (1<<MD_DISK_REMOVED);
1304 rdev_for_each(rdev2, mddev) {
1307 int is_active = test_bit(In_sync, &rdev2->flags);
1309 if (rdev2->raid_disk >= 0 &&
1310 sb->minor_version >= 91)
1311 /* we have nowhere to store the recovery_offset,
1312 * but if it is not below the reshape_position,
1313 * we can piggy-back on that.
1316 if (rdev2->raid_disk < 0 ||
1317 test_bit(Faulty, &rdev2->flags))
1320 desc_nr = rdev2->raid_disk;
1322 desc_nr = next_spare++;
1323 rdev2->desc_nr = desc_nr;
1324 d = &sb->disks[rdev2->desc_nr];
1326 d->number = rdev2->desc_nr;
1327 d->major = MAJOR(rdev2->bdev->bd_dev);
1328 d->minor = MINOR(rdev2->bdev->bd_dev);
1330 d->raid_disk = rdev2->raid_disk;
1332 d->raid_disk = rdev2->desc_nr; /* compatibility */
1333 if (test_bit(Faulty, &rdev2->flags))
1334 d->state = (1<<MD_DISK_FAULTY);
1335 else if (is_active) {
1336 d->state = (1<<MD_DISK_ACTIVE);
1337 if (test_bit(In_sync, &rdev2->flags))
1338 d->state |= (1<<MD_DISK_SYNC);
1346 if (test_bit(WriteMostly, &rdev2->flags))
1347 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1349 /* now set the "removed" and "faulty" bits on any missing devices */
1350 for (i=0 ; i < mddev->raid_disks ; i++) {
1351 mdp_disk_t *d = &sb->disks[i];
1352 if (d->state == 0 && d->number == 0) {
1355 d->state = (1<<MD_DISK_REMOVED);
1356 d->state |= (1<<MD_DISK_FAULTY);
1360 sb->nr_disks = nr_disks;
1361 sb->active_disks = active;
1362 sb->working_disks = working;
1363 sb->failed_disks = failed;
1364 sb->spare_disks = spare;
1366 sb->this_disk = sb->disks[rdev->desc_nr];
1367 sb->sb_csum = calc_sb_csum(sb);
1371 * rdev_size_change for 0.90.0
1373 static unsigned long long
1374 super_90_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
1376 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1377 return 0; /* component must fit device */
1378 if (rdev->mddev->bitmap_info.offset)
1379 return 0; /* can't move bitmap */
1380 rdev->sb_start = calc_dev_sboffset(rdev);
1381 if (!num_sectors || num_sectors > rdev->sb_start)
1382 num_sectors = rdev->sb_start;
1383 /* Limit to 4TB as metadata cannot record more than that.
1384 * 4TB == 2^32 KB, or 2*2^32 sectors.
1386 if (num_sectors >= (2ULL << 32) && rdev->mddev->level >= 1)
1387 num_sectors = (2ULL << 32) - 2;
1388 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1390 md_super_wait(rdev->mddev);
1395 super_90_allow_new_offset(struct md_rdev *rdev, unsigned long long new_offset)
1397 /* non-zero offset changes not possible with v0.90 */
1398 return new_offset == 0;
1402 * version 1 superblock
1405 static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb)
1409 unsigned long long newcsum;
1410 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1411 __le32 *isuper = (__le32*)sb;
1413 disk_csum = sb->sb_csum;
1416 for (; size >= 4; size -= 4)
1417 newcsum += le32_to_cpu(*isuper++);
1420 newcsum += le16_to_cpu(*(__le16*) isuper);
1422 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1423 sb->sb_csum = disk_csum;
1424 return cpu_to_le32(csum);
1427 static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors,
1429 static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
1431 struct mdp_superblock_1 *sb;
1435 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1439 * Calculate the position of the superblock in 512byte sectors.
1440 * It is always aligned to a 4K boundary and
1441 * depeding on minor_version, it can be:
1442 * 0: At least 8K, but less than 12K, from end of device
1443 * 1: At start of device
1444 * 2: 4K from start of device.
1446 switch(minor_version) {
1448 sb_start = i_size_read(rdev->bdev->bd_inode) >> 9;
1450 sb_start &= ~(sector_t)(4*2-1);
1461 rdev->sb_start = sb_start;
1463 /* superblock is rarely larger than 1K, but it can be larger,
1464 * and it is safe to read 4k, so we do that
1466 ret = read_disk_sb(rdev, 4096);
1467 if (ret) return ret;
1470 sb = page_address(rdev->sb_page);
1472 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1473 sb->major_version != cpu_to_le32(1) ||
1474 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1475 le64_to_cpu(sb->super_offset) != rdev->sb_start ||
1476 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1479 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1480 printk("md: invalid superblock checksum on %s\n",
1481 bdevname(rdev->bdev,b));
1484 if (le64_to_cpu(sb->data_size) < 10) {
1485 printk("md: data_size too small on %s\n",
1486 bdevname(rdev->bdev,b));
1491 memcmp(sb->pad3, sb->pad3+1, sizeof(sb->pad3) - sizeof(sb->pad3[1])))
1492 /* Some padding is non-zero, might be a new feature */
1495 rdev->preferred_minor = 0xffff;
1496 rdev->data_offset = le64_to_cpu(sb->data_offset);
1497 rdev->new_data_offset = rdev->data_offset;
1498 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE) &&
1499 (le32_to_cpu(sb->feature_map) & MD_FEATURE_NEW_OFFSET))
1500 rdev->new_data_offset += (s32)le32_to_cpu(sb->new_offset);
1501 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1503 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1504 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1505 if (rdev->sb_size & bmask)
1506 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1509 && rdev->data_offset < sb_start + (rdev->sb_size/512))
1512 && rdev->new_data_offset < sb_start + (rdev->sb_size/512))
1515 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1518 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1520 if (!rdev->bb_page) {
1521 rdev->bb_page = alloc_page(GFP_KERNEL);
1525 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BAD_BLOCKS) &&
1526 rdev->badblocks.count == 0) {
1527 /* need to load the bad block list.
1528 * Currently we limit it to one page.
1534 int sectors = le16_to_cpu(sb->bblog_size);
1535 if (sectors > (PAGE_SIZE / 512))
1537 offset = le32_to_cpu(sb->bblog_offset);
1540 bb_sector = (long long)offset;
1541 if (!sync_page_io(rdev, bb_sector, sectors << 9,
1542 rdev->bb_page, READ, true))
1544 bbp = (u64 *)page_address(rdev->bb_page);
1545 rdev->badblocks.shift = sb->bblog_shift;
1546 for (i = 0 ; i < (sectors << (9-3)) ; i++, bbp++) {
1547 u64 bb = le64_to_cpu(*bbp);
1548 int count = bb & (0x3ff);
1549 u64 sector = bb >> 10;
1550 sector <<= sb->bblog_shift;
1551 count <<= sb->bblog_shift;
1554 if (md_set_badblocks(&rdev->badblocks,
1555 sector, count, 1) == 0)
1558 } else if (sb->bblog_offset == 0)
1559 rdev->badblocks.shift = -1;
1565 struct mdp_superblock_1 *refsb = page_address(refdev->sb_page);
1567 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1568 sb->level != refsb->level ||
1569 sb->layout != refsb->layout ||
1570 sb->chunksize != refsb->chunksize) {
1571 printk(KERN_WARNING "md: %s has strangely different"
1572 " superblock to %s\n",
1573 bdevname(rdev->bdev,b),
1574 bdevname(refdev->bdev,b2));
1577 ev1 = le64_to_cpu(sb->events);
1578 ev2 = le64_to_cpu(refsb->events);
1585 if (minor_version) {
1586 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9);
1587 sectors -= rdev->data_offset;
1589 sectors = rdev->sb_start;
1590 if (sectors < le64_to_cpu(sb->data_size))
1592 rdev->sectors = le64_to_cpu(sb->data_size);
1596 static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev)
1598 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
1599 __u64 ev1 = le64_to_cpu(sb->events);
1601 rdev->raid_disk = -1;
1602 clear_bit(Faulty, &rdev->flags);
1603 clear_bit(In_sync, &rdev->flags);
1604 clear_bit(WriteMostly, &rdev->flags);
1606 if (mddev->raid_disks == 0) {
1607 mddev->major_version = 1;
1608 mddev->patch_version = 0;
1609 mddev->external = 0;
1610 mddev->chunk_sectors = le32_to_cpu(sb->chunksize);
1611 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1612 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1613 mddev->level = le32_to_cpu(sb->level);
1614 mddev->clevel[0] = 0;
1615 mddev->layout = le32_to_cpu(sb->layout);
1616 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1617 mddev->dev_sectors = le64_to_cpu(sb->size);
1618 mddev->events = ev1;
1619 mddev->bitmap_info.offset = 0;
1620 mddev->bitmap_info.space = 0;
1621 /* Default location for bitmap is 1K after superblock
1622 * using 3K - total of 4K
1624 mddev->bitmap_info.default_offset = 1024 >> 9;
1625 mddev->bitmap_info.default_space = (4096-1024) >> 9;
1626 mddev->reshape_backwards = 0;
1628 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1629 memcpy(mddev->uuid, sb->set_uuid, 16);
1631 mddev->max_disks = (4096-256)/2;
1633 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1634 mddev->bitmap_info.file == NULL) {
1635 mddev->bitmap_info.offset =
1636 (__s32)le32_to_cpu(sb->bitmap_offset);
1637 /* Metadata doesn't record how much space is available.
1638 * For 1.0, we assume we can use up to the superblock
1639 * if before, else to 4K beyond superblock.
1640 * For others, assume no change is possible.
1642 if (mddev->minor_version > 0)
1643 mddev->bitmap_info.space = 0;
1644 else if (mddev->bitmap_info.offset > 0)
1645 mddev->bitmap_info.space =
1646 8 - mddev->bitmap_info.offset;
1648 mddev->bitmap_info.space =
1649 -mddev->bitmap_info.offset;
1652 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1653 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1654 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1655 mddev->new_level = le32_to_cpu(sb->new_level);
1656 mddev->new_layout = le32_to_cpu(sb->new_layout);
1657 mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk);
1658 if (mddev->delta_disks < 0 ||
1659 (mddev->delta_disks == 0 &&
1660 (le32_to_cpu(sb->feature_map)
1661 & MD_FEATURE_RESHAPE_BACKWARDS)))
1662 mddev->reshape_backwards = 1;
1664 mddev->reshape_position = MaxSector;
1665 mddev->delta_disks = 0;
1666 mddev->new_level = mddev->level;
1667 mddev->new_layout = mddev->layout;
1668 mddev->new_chunk_sectors = mddev->chunk_sectors;
1671 } else if (mddev->pers == NULL) {
1672 /* Insist of good event counter while assembling, except for
1673 * spares (which don't need an event count) */
1675 if (rdev->desc_nr >= 0 &&
1676 rdev->desc_nr < le32_to_cpu(sb->max_dev) &&
1677 le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < 0xfffe)
1678 if (ev1 < mddev->events)
1680 } else if (mddev->bitmap) {
1681 /* If adding to array with a bitmap, then we can accept an
1682 * older device, but not too old.
1684 if (ev1 < mddev->bitmap->events_cleared)
1687 if (ev1 < mddev->events)
1688 /* just a hot-add of a new device, leave raid_disk at -1 */
1691 if (mddev->level != LEVEL_MULTIPATH) {
1693 if (rdev->desc_nr < 0 ||
1694 rdev->desc_nr >= le32_to_cpu(sb->max_dev)) {
1698 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1700 case 0xffff: /* spare */
1702 case 0xfffe: /* faulty */
1703 set_bit(Faulty, &rdev->flags);
1706 if ((le32_to_cpu(sb->feature_map) &
1707 MD_FEATURE_RECOVERY_OFFSET))
1708 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1710 set_bit(In_sync, &rdev->flags);
1711 rdev->raid_disk = role;
1714 if (sb->devflags & WriteMostly1)
1715 set_bit(WriteMostly, &rdev->flags);
1716 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_REPLACEMENT)
1717 set_bit(Replacement, &rdev->flags);
1718 } else /* MULTIPATH are always insync */
1719 set_bit(In_sync, &rdev->flags);
1724 static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev)
1726 struct mdp_superblock_1 *sb;
1727 struct md_rdev *rdev2;
1729 /* make rdev->sb match mddev and rdev data. */
1731 sb = page_address(rdev->sb_page);
1733 sb->feature_map = 0;
1735 sb->recovery_offset = cpu_to_le64(0);
1736 memset(sb->pad3, 0, sizeof(sb->pad3));
1738 sb->utime = cpu_to_le64((__u64)mddev->utime);
1739 sb->events = cpu_to_le64(mddev->events);
1741 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1743 sb->resync_offset = cpu_to_le64(0);
1745 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
1747 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
1748 sb->size = cpu_to_le64(mddev->dev_sectors);
1749 sb->chunksize = cpu_to_le32(mddev->chunk_sectors);
1750 sb->level = cpu_to_le32(mddev->level);
1751 sb->layout = cpu_to_le32(mddev->layout);
1753 if (test_bit(WriteMostly, &rdev->flags))
1754 sb->devflags |= WriteMostly1;
1756 sb->devflags &= ~WriteMostly1;
1757 sb->data_offset = cpu_to_le64(rdev->data_offset);
1758 sb->data_size = cpu_to_le64(rdev->sectors);
1760 if (mddev->bitmap && mddev->bitmap_info.file == NULL) {
1761 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset);
1762 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
1765 if (rdev->raid_disk >= 0 &&
1766 !test_bit(In_sync, &rdev->flags)) {
1768 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1769 sb->recovery_offset =
1770 cpu_to_le64(rdev->recovery_offset);
1772 if (test_bit(Replacement, &rdev->flags))
1774 cpu_to_le32(MD_FEATURE_REPLACEMENT);
1776 if (mddev->reshape_position != MaxSector) {
1777 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1778 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1779 sb->new_layout = cpu_to_le32(mddev->new_layout);
1780 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1781 sb->new_level = cpu_to_le32(mddev->new_level);
1782 sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors);
1783 if (mddev->delta_disks == 0 &&
1784 mddev->reshape_backwards)
1786 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS);
1787 if (rdev->new_data_offset != rdev->data_offset) {
1789 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET);
1790 sb->new_offset = cpu_to_le32((__u32)(rdev->new_data_offset
1791 - rdev->data_offset));
1795 if (rdev->badblocks.count == 0)
1796 /* Nothing to do for bad blocks*/ ;
1797 else if (sb->bblog_offset == 0)
1798 /* Cannot record bad blocks on this device */
1799 md_error(mddev, rdev);
1801 struct badblocks *bb = &rdev->badblocks;
1802 u64 *bbp = (u64 *)page_address(rdev->bb_page);
1804 sb->feature_map |= cpu_to_le32(MD_FEATURE_BAD_BLOCKS);
1809 seq = read_seqbegin(&bb->lock);
1811 memset(bbp, 0xff, PAGE_SIZE);
1813 for (i = 0 ; i < bb->count ; i++) {
1814 u64 internal_bb = p[i];
1815 u64 store_bb = ((BB_OFFSET(internal_bb) << 10)
1816 | BB_LEN(internal_bb));
1817 bbp[i] = cpu_to_le64(store_bb);
1820 if (read_seqretry(&bb->lock, seq))
1823 bb->sector = (rdev->sb_start +
1824 (int)le32_to_cpu(sb->bblog_offset));
1825 bb->size = le16_to_cpu(sb->bblog_size);
1830 rdev_for_each(rdev2, mddev)
1831 if (rdev2->desc_nr+1 > max_dev)
1832 max_dev = rdev2->desc_nr+1;
1834 if (max_dev > le32_to_cpu(sb->max_dev)) {
1836 sb->max_dev = cpu_to_le32(max_dev);
1837 rdev->sb_size = max_dev * 2 + 256;
1838 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1839 if (rdev->sb_size & bmask)
1840 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1842 max_dev = le32_to_cpu(sb->max_dev);
1844 for (i=0; i<max_dev;i++)
1845 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1847 rdev_for_each(rdev2, mddev) {
1849 if (test_bit(Faulty, &rdev2->flags))
1850 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1851 else if (test_bit(In_sync, &rdev2->flags))
1852 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1853 else if (rdev2->raid_disk >= 0)
1854 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1856 sb->dev_roles[i] = cpu_to_le16(0xffff);
1859 sb->sb_csum = calc_sb_1_csum(sb);
1862 static unsigned long long
1863 super_1_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
1865 struct mdp_superblock_1 *sb;
1866 sector_t max_sectors;
1867 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1868 return 0; /* component must fit device */
1869 if (rdev->data_offset != rdev->new_data_offset)
1870 return 0; /* too confusing */
1871 if (rdev->sb_start < rdev->data_offset) {
1872 /* minor versions 1 and 2; superblock before data */
1873 max_sectors = i_size_read(rdev->bdev->bd_inode) >> 9;
1874 max_sectors -= rdev->data_offset;
1875 if (!num_sectors || num_sectors > max_sectors)
1876 num_sectors = max_sectors;
1877 } else if (rdev->mddev->bitmap_info.offset) {
1878 /* minor version 0 with bitmap we can't move */
1881 /* minor version 0; superblock after data */
1883 sb_start = (i_size_read(rdev->bdev->bd_inode) >> 9) - 8*2;
1884 sb_start &= ~(sector_t)(4*2 - 1);
1885 max_sectors = rdev->sectors + sb_start - rdev->sb_start;
1886 if (!num_sectors || num_sectors > max_sectors)
1887 num_sectors = max_sectors;
1888 rdev->sb_start = sb_start;
1890 sb = page_address(rdev->sb_page);
1891 sb->data_size = cpu_to_le64(num_sectors);
1892 sb->super_offset = rdev->sb_start;
1893 sb->sb_csum = calc_sb_1_csum(sb);
1894 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1896 md_super_wait(rdev->mddev);
1902 super_1_allow_new_offset(struct md_rdev *rdev,
1903 unsigned long long new_offset)
1905 /* All necessary checks on new >= old have been done */
1906 struct bitmap *bitmap;
1907 if (new_offset >= rdev->data_offset)
1910 /* with 1.0 metadata, there is no metadata to tread on
1911 * so we can always move back */
1912 if (rdev->mddev->minor_version == 0)
1915 /* otherwise we must be sure not to step on
1916 * any metadata, so stay:
1917 * 36K beyond start of superblock
1918 * beyond end of badblocks
1919 * beyond write-intent bitmap
1921 if (rdev->sb_start + (32+4)*2 > new_offset)
1923 bitmap = rdev->mddev->bitmap;
1924 if (bitmap && !rdev->mddev->bitmap_info.file &&
1925 rdev->sb_start + rdev->mddev->bitmap_info.offset +
1926 bitmap->storage.file_pages * (PAGE_SIZE>>9) > new_offset)
1928 if (rdev->badblocks.sector + rdev->badblocks.size > new_offset)
1934 static struct super_type super_types[] = {
1937 .owner = THIS_MODULE,
1938 .load_super = super_90_load,
1939 .validate_super = super_90_validate,
1940 .sync_super = super_90_sync,
1941 .rdev_size_change = super_90_rdev_size_change,
1942 .allow_new_offset = super_90_allow_new_offset,
1946 .owner = THIS_MODULE,
1947 .load_super = super_1_load,
1948 .validate_super = super_1_validate,
1949 .sync_super = super_1_sync,
1950 .rdev_size_change = super_1_rdev_size_change,
1951 .allow_new_offset = super_1_allow_new_offset,
1955 static void sync_super(struct mddev *mddev, struct md_rdev *rdev)
1957 if (mddev->sync_super) {
1958 mddev->sync_super(mddev, rdev);
1962 BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types));
1964 super_types[mddev->major_version].sync_super(mddev, rdev);
1967 static int match_mddev_units(struct mddev *mddev1, struct mddev *mddev2)
1969 struct md_rdev *rdev, *rdev2;
1972 rdev_for_each_rcu(rdev, mddev1)
1973 rdev_for_each_rcu(rdev2, mddev2)
1974 if (rdev->bdev->bd_contains ==
1975 rdev2->bdev->bd_contains) {
1983 static LIST_HEAD(pending_raid_disks);
1986 * Try to register data integrity profile for an mddev
1988 * This is called when an array is started and after a disk has been kicked
1989 * from the array. It only succeeds if all working and active component devices
1990 * are integrity capable with matching profiles.
1992 int md_integrity_register(struct mddev *mddev)
1994 struct md_rdev *rdev, *reference = NULL;
1996 if (list_empty(&mddev->disks))
1997 return 0; /* nothing to do */
1998 if (!mddev->gendisk || blk_get_integrity(mddev->gendisk))
1999 return 0; /* shouldn't register, or already is */
2000 rdev_for_each(rdev, mddev) {
2001 /* skip spares and non-functional disks */
2002 if (test_bit(Faulty, &rdev->flags))
2004 if (rdev->raid_disk < 0)
2007 /* Use the first rdev as the reference */
2011 /* does this rdev's profile match the reference profile? */
2012 if (blk_integrity_compare(reference->bdev->bd_disk,
2013 rdev->bdev->bd_disk) < 0)
2016 if (!reference || !bdev_get_integrity(reference->bdev))
2019 * All component devices are integrity capable and have matching
2020 * profiles, register the common profile for the md device.
2022 if (blk_integrity_register(mddev->gendisk,
2023 bdev_get_integrity(reference->bdev)) != 0) {
2024 printk(KERN_ERR "md: failed to register integrity for %s\n",
2028 printk(KERN_NOTICE "md: data integrity enabled on %s\n", mdname(mddev));
2029 if (bioset_integrity_create(mddev->bio_set, BIO_POOL_SIZE)) {
2030 printk(KERN_ERR "md: failed to create integrity pool for %s\n",
2036 EXPORT_SYMBOL(md_integrity_register);
2038 /* Disable data integrity if non-capable/non-matching disk is being added */
2039 void md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev)
2041 struct blk_integrity *bi_rdev;
2042 struct blk_integrity *bi_mddev;
2044 if (!mddev->gendisk)
2047 bi_rdev = bdev_get_integrity(rdev->bdev);
2048 bi_mddev = blk_get_integrity(mddev->gendisk);
2050 if (!bi_mddev) /* nothing to do */
2052 if (rdev->raid_disk < 0) /* skip spares */
2054 if (bi_rdev && blk_integrity_compare(mddev->gendisk,
2055 rdev->bdev->bd_disk) >= 0)
2057 printk(KERN_NOTICE "disabling data integrity on %s\n", mdname(mddev));
2058 blk_integrity_unregister(mddev->gendisk);
2060 EXPORT_SYMBOL(md_integrity_add_rdev);
2062 static int bind_rdev_to_array(struct md_rdev * rdev, struct mddev * mddev)
2064 char b[BDEVNAME_SIZE];
2074 /* prevent duplicates */
2075 if (find_rdev(mddev, rdev->bdev->bd_dev))
2078 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2079 if (rdev->sectors && (mddev->dev_sectors == 0 ||
2080 rdev->sectors < mddev->dev_sectors)) {
2082 /* Cannot change size, so fail
2083 * If mddev->level <= 0, then we don't care
2084 * about aligning sizes (e.g. linear)
2086 if (mddev->level > 0)
2089 mddev->dev_sectors = rdev->sectors;
2092 /* Verify rdev->desc_nr is unique.
2093 * If it is -1, assign a free number, else
2094 * check number is not in use
2096 if (rdev->desc_nr < 0) {
2098 if (mddev->pers) choice = mddev->raid_disks;
2099 while (find_rdev_nr(mddev, choice))
2101 rdev->desc_nr = choice;
2103 if (find_rdev_nr(mddev, rdev->desc_nr))
2106 if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) {
2107 printk(KERN_WARNING "md: %s: array is limited to %d devices\n",
2108 mdname(mddev), mddev->max_disks);
2111 bdevname(rdev->bdev,b);
2112 while ( (s=strchr(b, '/')) != NULL)
2115 rdev->mddev = mddev;
2116 printk(KERN_INFO "md: bind<%s>\n", b);
2118 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
2121 ko = &part_to_dev(rdev->bdev->bd_part)->kobj;
2122 if (sysfs_create_link(&rdev->kobj, ko, "block"))
2123 /* failure here is OK */;
2124 rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state");
2126 list_add_rcu(&rdev->same_set, &mddev->disks);
2127 bd_link_disk_holder(rdev->bdev, mddev->gendisk);
2129 /* May as well allow recovery to be retried once */
2130 mddev->recovery_disabled++;
2135 printk(KERN_WARNING "md: failed to register dev-%s for %s\n",
2140 static void md_delayed_delete(struct work_struct *ws)
2142 struct md_rdev *rdev = container_of(ws, struct md_rdev, del_work);
2143 kobject_del(&rdev->kobj);
2144 kobject_put(&rdev->kobj);
2147 static void unbind_rdev_from_array(struct md_rdev * rdev)
2149 char b[BDEVNAME_SIZE];
2154 bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk);
2155 list_del_rcu(&rdev->same_set);
2156 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
2158 sysfs_remove_link(&rdev->kobj, "block");
2159 sysfs_put(rdev->sysfs_state);
2160 rdev->sysfs_state = NULL;
2161 rdev->badblocks.count = 0;
2162 /* We need to delay this, otherwise we can deadlock when
2163 * writing to 'remove' to "dev/state". We also need
2164 * to delay it due to rcu usage.
2167 INIT_WORK(&rdev->del_work, md_delayed_delete);
2168 kobject_get(&rdev->kobj);
2169 queue_work(md_misc_wq, &rdev->del_work);
2173 * prevent the device from being mounted, repartitioned or
2174 * otherwise reused by a RAID array (or any other kernel
2175 * subsystem), by bd_claiming the device.
2177 static int lock_rdev(struct md_rdev *rdev, dev_t dev, int shared)
2180 struct block_device *bdev;
2181 char b[BDEVNAME_SIZE];
2183 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
2184 shared ? (struct md_rdev *)lock_rdev : rdev);
2186 printk(KERN_ERR "md: could not open %s.\n",
2187 __bdevname(dev, b));
2188 return PTR_ERR(bdev);
2194 static void unlock_rdev(struct md_rdev *rdev)
2196 struct block_device *bdev = rdev->bdev;
2200 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
2203 void md_autodetect_dev(dev_t dev);
2205 static void export_rdev(struct md_rdev * rdev)
2207 char b[BDEVNAME_SIZE];
2208 printk(KERN_INFO "md: export_rdev(%s)\n",
2209 bdevname(rdev->bdev,b));
2212 md_rdev_clear(rdev);
2214 if (test_bit(AutoDetected, &rdev->flags))
2215 md_autodetect_dev(rdev->bdev->bd_dev);
2218 kobject_put(&rdev->kobj);
2221 static void kick_rdev_from_array(struct md_rdev * rdev)
2223 unbind_rdev_from_array(rdev);
2227 static void export_array(struct mddev *mddev)
2229 struct md_rdev *rdev, *tmp;
2231 rdev_for_each_safe(rdev, tmp, mddev) {
2236 kick_rdev_from_array(rdev);
2238 if (!list_empty(&mddev->disks))
2240 mddev->raid_disks = 0;
2241 mddev->major_version = 0;
2244 static void print_desc(mdp_disk_t *desc)
2246 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
2247 desc->major,desc->minor,desc->raid_disk,desc->state);
2250 static void print_sb_90(mdp_super_t *sb)
2255 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
2256 sb->major_version, sb->minor_version, sb->patch_version,
2257 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
2259 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
2260 sb->level, sb->size, sb->nr_disks, sb->raid_disks,
2261 sb->md_minor, sb->layout, sb->chunk_size);
2262 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
2263 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
2264 sb->utime, sb->state, sb->active_disks, sb->working_disks,
2265 sb->failed_disks, sb->spare_disks,
2266 sb->sb_csum, (unsigned long)sb->events_lo);
2269 for (i = 0; i < MD_SB_DISKS; i++) {
2272 desc = sb->disks + i;
2273 if (desc->number || desc->major || desc->minor ||
2274 desc->raid_disk || (desc->state && (desc->state != 4))) {
2275 printk(" D %2d: ", i);
2279 printk(KERN_INFO "md: THIS: ");
2280 print_desc(&sb->this_disk);
2283 static void print_sb_1(struct mdp_superblock_1 *sb)
2287 uuid = sb->set_uuid;
2289 "md: SB: (V:%u) (F:0x%08x) Array-ID:<%pU>\n"
2290 "md: Name: \"%s\" CT:%llu\n",
2291 le32_to_cpu(sb->major_version),
2292 le32_to_cpu(sb->feature_map),
2295 (unsigned long long)le64_to_cpu(sb->ctime)
2296 & MD_SUPERBLOCK_1_TIME_SEC_MASK);
2298 uuid = sb->device_uuid;
2300 "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu"
2302 "md: Dev:%08x UUID: %pU\n"
2303 "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n"
2304 "md: (MaxDev:%u) \n",
2305 le32_to_cpu(sb->level),
2306 (unsigned long long)le64_to_cpu(sb->size),
2307 le32_to_cpu(sb->raid_disks),
2308 le32_to_cpu(sb->layout),
2309 le32_to_cpu(sb->chunksize),
2310 (unsigned long long)le64_to_cpu(sb->data_offset),
2311 (unsigned long long)le64_to_cpu(sb->data_size),
2312 (unsigned long long)le64_to_cpu(sb->super_offset),
2313 (unsigned long long)le64_to_cpu(sb->recovery_offset),
2314 le32_to_cpu(sb->dev_number),
2317 (unsigned long long)le64_to_cpu(sb->utime) & MD_SUPERBLOCK_1_TIME_SEC_MASK,
2318 (unsigned long long)le64_to_cpu(sb->events),
2319 (unsigned long long)le64_to_cpu(sb->resync_offset),
2320 le32_to_cpu(sb->sb_csum),
2321 le32_to_cpu(sb->max_dev)
2325 static void print_rdev(struct md_rdev *rdev, int major_version)
2327 char b[BDEVNAME_SIZE];
2328 printk(KERN_INFO "md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n",
2329 bdevname(rdev->bdev, b), (unsigned long long)rdev->sectors,
2330 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
2332 if (rdev->sb_loaded) {
2333 printk(KERN_INFO "md: rdev superblock (MJ:%d):\n", major_version);
2334 switch (major_version) {
2336 print_sb_90(page_address(rdev->sb_page));
2339 print_sb_1(page_address(rdev->sb_page));
2343 printk(KERN_INFO "md: no rdev superblock!\n");
2346 static void md_print_devices(void)
2348 struct list_head *tmp;
2349 struct md_rdev *rdev;
2350 struct mddev *mddev;
2351 char b[BDEVNAME_SIZE];
2354 printk("md: **********************************\n");
2355 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
2356 printk("md: **********************************\n");
2357 for_each_mddev(mddev, tmp) {
2360 bitmap_print_sb(mddev->bitmap);
2362 printk("%s: ", mdname(mddev));
2363 rdev_for_each(rdev, mddev)
2364 printk("<%s>", bdevname(rdev->bdev,b));
2367 rdev_for_each(rdev, mddev)
2368 print_rdev(rdev, mddev->major_version);
2370 printk("md: **********************************\n");
2375 static void sync_sbs(struct mddev * mddev, int nospares)
2377 /* Update each superblock (in-memory image), but
2378 * if we are allowed to, skip spares which already
2379 * have the right event counter, or have one earlier
2380 * (which would mean they aren't being marked as dirty
2381 * with the rest of the array)
2383 struct md_rdev *rdev;
2384 rdev_for_each(rdev, mddev) {
2385 if (rdev->sb_events == mddev->events ||
2387 rdev->raid_disk < 0 &&
2388 rdev->sb_events+1 == mddev->events)) {
2389 /* Don't update this superblock */
2390 rdev->sb_loaded = 2;
2392 sync_super(mddev, rdev);
2393 rdev->sb_loaded = 1;
2398 static void md_update_sb(struct mddev * mddev, int force_change)
2400 struct md_rdev *rdev;
2403 int any_badblocks_changed = 0;
2406 /* First make sure individual recovery_offsets are correct */
2407 rdev_for_each(rdev, mddev) {
2408 if (rdev->raid_disk >= 0 &&
2409 mddev->delta_disks >= 0 &&
2410 !test_bit(In_sync, &rdev->flags) &&
2411 mddev->curr_resync_completed > rdev->recovery_offset)
2412 rdev->recovery_offset = mddev->curr_resync_completed;
2415 if (!mddev->persistent) {
2416 clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
2417 clear_bit(MD_CHANGE_DEVS, &mddev->flags);
2418 if (!mddev->external) {
2419 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2420 rdev_for_each(rdev, mddev) {
2421 if (rdev->badblocks.changed) {
2422 rdev->badblocks.changed = 0;
2423 md_ack_all_badblocks(&rdev->badblocks);
2424 md_error(mddev, rdev);
2426 clear_bit(Blocked, &rdev->flags);
2427 clear_bit(BlockedBadBlocks, &rdev->flags);
2428 wake_up(&rdev->blocked_wait);
2431 wake_up(&mddev->sb_wait);
2435 spin_lock_irq(&mddev->write_lock);
2437 mddev->utime = get_seconds();
2439 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
2441 if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags))
2442 /* just a clean<-> dirty transition, possibly leave spares alone,
2443 * though if events isn't the right even/odd, we will have to do
2449 if (mddev->degraded)
2450 /* If the array is degraded, then skipping spares is both
2451 * dangerous and fairly pointless.
2452 * Dangerous because a device that was removed from the array
2453 * might have a event_count that still looks up-to-date,
2454 * so it can be re-added without a resync.
2455 * Pointless because if there are any spares to skip,
2456 * then a recovery will happen and soon that array won't
2457 * be degraded any more and the spare can go back to sleep then.
2461 sync_req = mddev->in_sync;
2463 /* If this is just a dirty<->clean transition, and the array is clean
2464 * and 'events' is odd, we can roll back to the previous clean state */
2466 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
2467 && mddev->can_decrease_events
2468 && mddev->events != 1) {
2470 mddev->can_decrease_events = 0;
2472 /* otherwise we have to go forward and ... */
2474 mddev->can_decrease_events = nospares;
2477 if (!mddev->events) {
2479 * oops, this 64-bit counter should never wrap.
2480 * Either we are in around ~1 trillion A.C., assuming
2481 * 1 reboot per second, or we have a bug:
2487 rdev_for_each(rdev, mddev) {
2488 if (rdev->badblocks.changed)
2489 any_badblocks_changed++;
2490 if (test_bit(Faulty, &rdev->flags))
2491 set_bit(FaultRecorded, &rdev->flags);
2494 sync_sbs(mddev, nospares);
2495 spin_unlock_irq(&mddev->write_lock);
2497 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2498 mdname(mddev), mddev->in_sync);
2500 bitmap_update_sb(mddev->bitmap);
2501 rdev_for_each(rdev, mddev) {
2502 char b[BDEVNAME_SIZE];
2504 if (rdev->sb_loaded != 1)
2505 continue; /* no noise on spare devices */
2507 if (!test_bit(Faulty, &rdev->flags) &&
2508 rdev->saved_raid_disk == -1) {
2509 md_super_write(mddev,rdev,
2510 rdev->sb_start, rdev->sb_size,
2512 pr_debug("md: (write) %s's sb offset: %llu\n",
2513 bdevname(rdev->bdev, b),
2514 (unsigned long long)rdev->sb_start);
2515 rdev->sb_events = mddev->events;
2516 if (rdev->badblocks.size) {
2517 md_super_write(mddev, rdev,
2518 rdev->badblocks.sector,
2519 rdev->badblocks.size << 9,
2521 rdev->badblocks.size = 0;
2524 } else if (test_bit(Faulty, &rdev->flags))
2525 pr_debug("md: %s (skipping faulty)\n",
2526 bdevname(rdev->bdev, b));
2528 pr_debug("(skipping incremental s/r ");
2530 if (mddev->level == LEVEL_MULTIPATH)
2531 /* only need to write one superblock... */
2534 md_super_wait(mddev);
2535 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2537 spin_lock_irq(&mddev->write_lock);
2538 if (mddev->in_sync != sync_req ||
2539 test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
2540 /* have to write it out again */
2541 spin_unlock_irq(&mddev->write_lock);
2544 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2545 spin_unlock_irq(&mddev->write_lock);
2546 wake_up(&mddev->sb_wait);
2547 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
2548 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
2550 rdev_for_each(rdev, mddev) {
2551 if (test_and_clear_bit(FaultRecorded, &rdev->flags))
2552 clear_bit(Blocked, &rdev->flags);
2554 if (any_badblocks_changed)
2555 md_ack_all_badblocks(&rdev->badblocks);
2556 clear_bit(BlockedBadBlocks, &rdev->flags);
2557 wake_up(&rdev->blocked_wait);
2561 /* words written to sysfs files may, or may not, be \n terminated.
2562 * We want to accept with case. For this we use cmd_match.
2564 static int cmd_match(const char *cmd, const char *str)
2566 /* See if cmd, written into a sysfs file, matches
2567 * str. They must either be the same, or cmd can
2568 * have a trailing newline
2570 while (*cmd && *str && *cmd == *str) {
2581 struct rdev_sysfs_entry {
2582 struct attribute attr;
2583 ssize_t (*show)(struct md_rdev *, char *);
2584 ssize_t (*store)(struct md_rdev *, const char *, size_t);
2588 state_show(struct md_rdev *rdev, char *page)
2593 if (test_bit(Faulty, &rdev->flags) ||
2594 rdev->badblocks.unacked_exist) {
2595 len+= sprintf(page+len, "%sfaulty",sep);
2598 if (test_bit(In_sync, &rdev->flags)) {
2599 len += sprintf(page+len, "%sin_sync",sep);
2602 if (test_bit(WriteMostly, &rdev->flags)) {
2603 len += sprintf(page+len, "%swrite_mostly",sep);
2606 if (test_bit(Blocked, &rdev->flags) ||
2607 (rdev->badblocks.unacked_exist
2608 && !test_bit(Faulty, &rdev->flags))) {
2609 len += sprintf(page+len, "%sblocked", sep);
2612 if (!test_bit(Faulty, &rdev->flags) &&
2613 !test_bit(In_sync, &rdev->flags)) {
2614 len += sprintf(page+len, "%sspare", sep);
2617 if (test_bit(WriteErrorSeen, &rdev->flags)) {
2618 len += sprintf(page+len, "%swrite_error", sep);
2621 if (test_bit(WantReplacement, &rdev->flags)) {
2622 len += sprintf(page+len, "%swant_replacement", sep);
2625 if (test_bit(Replacement, &rdev->flags)) {
2626 len += sprintf(page+len, "%sreplacement", sep);
2630 return len+sprintf(page+len, "\n");
2634 state_store(struct md_rdev *rdev, const char *buf, size_t len)
2637 * faulty - simulates an error
2638 * remove - disconnects the device
2639 * writemostly - sets write_mostly
2640 * -writemostly - clears write_mostly
2641 * blocked - sets the Blocked flags
2642 * -blocked - clears the Blocked and possibly simulates an error
2643 * insync - sets Insync providing device isn't active
2644 * write_error - sets WriteErrorSeen
2645 * -write_error - clears WriteErrorSeen
2648 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
2649 md_error(rdev->mddev, rdev);
2650 if (test_bit(Faulty, &rdev->flags))
2654 } else if (cmd_match(buf, "remove")) {
2655 if (rdev->raid_disk >= 0)
2658 struct mddev *mddev = rdev->mddev;
2659 kick_rdev_from_array(rdev);
2661 md_update_sb(mddev, 1);
2662 md_new_event(mddev);
2665 } else if (cmd_match(buf, "writemostly")) {
2666 set_bit(WriteMostly, &rdev->flags);
2668 } else if (cmd_match(buf, "-writemostly")) {
2669 clear_bit(WriteMostly, &rdev->flags);
2671 } else if (cmd_match(buf, "blocked")) {
2672 set_bit(Blocked, &rdev->flags);
2674 } else if (cmd_match(buf, "-blocked")) {
2675 if (!test_bit(Faulty, &rdev->flags) &&
2676 rdev->badblocks.unacked_exist) {
2677 /* metadata handler doesn't understand badblocks,
2678 * so we need to fail the device
2680 md_error(rdev->mddev, rdev);
2682 clear_bit(Blocked, &rdev->flags);
2683 clear_bit(BlockedBadBlocks, &rdev->flags);
2684 wake_up(&rdev->blocked_wait);
2685 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2686 md_wakeup_thread(rdev->mddev->thread);
2689 } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) {
2690 set_bit(In_sync, &rdev->flags);
2692 } else if (cmd_match(buf, "write_error")) {
2693 set_bit(WriteErrorSeen, &rdev->flags);
2695 } else if (cmd_match(buf, "-write_error")) {
2696 clear_bit(WriteErrorSeen, &rdev->flags);
2698 } else if (cmd_match(buf, "want_replacement")) {
2699 /* Any non-spare device that is not a replacement can
2700 * become want_replacement at any time, but we then need to
2701 * check if recovery is needed.
2703 if (rdev->raid_disk >= 0 &&
2704 !test_bit(Replacement, &rdev->flags))
2705 set_bit(WantReplacement, &rdev->flags);
2706 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2707 md_wakeup_thread(rdev->mddev->thread);
2709 } else if (cmd_match(buf, "-want_replacement")) {
2710 /* Clearing 'want_replacement' is always allowed.
2711 * Once replacements starts it is too late though.
2714 clear_bit(WantReplacement, &rdev->flags);
2715 } else if (cmd_match(buf, "replacement")) {
2716 /* Can only set a device as a replacement when array has not
2717 * yet been started. Once running, replacement is automatic
2718 * from spares, or by assigning 'slot'.
2720 if (rdev->mddev->pers)
2723 set_bit(Replacement, &rdev->flags);
2726 } else if (cmd_match(buf, "-replacement")) {
2727 /* Similarly, can only clear Replacement before start */
2728 if (rdev->mddev->pers)
2731 clear_bit(Replacement, &rdev->flags);
2736 sysfs_notify_dirent_safe(rdev->sysfs_state);
2737 return err ? err : len;
2739 static struct rdev_sysfs_entry rdev_state =
2740 __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store);
2743 errors_show(struct md_rdev *rdev, char *page)
2745 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
2749 errors_store(struct md_rdev *rdev, const char *buf, size_t len)
2752 unsigned long n = simple_strtoul(buf, &e, 10);
2753 if (*buf && (*e == 0 || *e == '\n')) {
2754 atomic_set(&rdev->corrected_errors, n);
2759 static struct rdev_sysfs_entry rdev_errors =
2760 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
2763 slot_show(struct md_rdev *rdev, char *page)
2765 if (rdev->raid_disk < 0)
2766 return sprintf(page, "none\n");
2768 return sprintf(page, "%d\n", rdev->raid_disk);
2772 slot_store(struct md_rdev *rdev, const char *buf, size_t len)
2776 int slot = simple_strtoul(buf, &e, 10);
2777 if (strncmp(buf, "none", 4)==0)
2779 else if (e==buf || (*e && *e!= '\n'))
2781 if (rdev->mddev->pers && slot == -1) {
2782 /* Setting 'slot' on an active array requires also
2783 * updating the 'rd%d' link, and communicating
2784 * with the personality with ->hot_*_disk.
2785 * For now we only support removing
2786 * failed/spare devices. This normally happens automatically,
2787 * but not when the metadata is externally managed.
2789 if (rdev->raid_disk == -1)
2791 /* personality does all needed checks */
2792 if (rdev->mddev->pers->hot_remove_disk == NULL)
2794 err = rdev->mddev->pers->
2795 hot_remove_disk(rdev->mddev, rdev);
2798 sysfs_unlink_rdev(rdev->mddev, rdev);
2799 rdev->raid_disk = -1;
2800 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2801 md_wakeup_thread(rdev->mddev->thread);
2802 } else if (rdev->mddev->pers) {
2803 /* Activating a spare .. or possibly reactivating
2804 * if we ever get bitmaps working here.
2807 if (rdev->raid_disk != -1)
2810 if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery))
2813 if (rdev->mddev->pers->hot_add_disk == NULL)
2816 if (slot >= rdev->mddev->raid_disks &&
2817 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
2820 rdev->raid_disk = slot;
2821 if (test_bit(In_sync, &rdev->flags))
2822 rdev->saved_raid_disk = slot;
2824 rdev->saved_raid_disk = -1;
2825 clear_bit(In_sync, &rdev->flags);
2826 err = rdev->mddev->pers->
2827 hot_add_disk(rdev->mddev, rdev);
2829 rdev->raid_disk = -1;
2832 sysfs_notify_dirent_safe(rdev->sysfs_state);
2833 if (sysfs_link_rdev(rdev->mddev, rdev))
2834 /* failure here is OK */;
2835 /* don't wakeup anyone, leave that to userspace. */
2837 if (slot >= rdev->mddev->raid_disks &&
2838 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
2840 rdev->raid_disk = slot;
2841 /* assume it is working */
2842 clear_bit(Faulty, &rdev->flags);
2843 clear_bit(WriteMostly, &rdev->flags);
2844 set_bit(In_sync, &rdev->flags);
2845 sysfs_notify_dirent_safe(rdev->sysfs_state);
2851 static struct rdev_sysfs_entry rdev_slot =
2852 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
2855 offset_show(struct md_rdev *rdev, char *page)
2857 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
2861 offset_store(struct md_rdev *rdev, const char *buf, size_t len)
2863 unsigned long long offset;
2864 if (strict_strtoull(buf, 10, &offset) < 0)
2866 if (rdev->mddev->pers && rdev->raid_disk >= 0)
2868 if (rdev->sectors && rdev->mddev->external)
2869 /* Must set offset before size, so overlap checks
2872 rdev->data_offset = offset;
2873 rdev->new_data_offset = offset;
2877 static struct rdev_sysfs_entry rdev_offset =
2878 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
2880 static ssize_t new_offset_show(struct md_rdev *rdev, char *page)
2882 return sprintf(page, "%llu\n",
2883 (unsigned long long)rdev->new_data_offset);
2886 static ssize_t new_offset_store(struct md_rdev *rdev,
2887 const char *buf, size_t len)
2889 unsigned long long new_offset;
2890 struct mddev *mddev = rdev->mddev;
2892 if (strict_strtoull(buf, 10, &new_offset) < 0)
2895 if (mddev->sync_thread)
2897 if (new_offset == rdev->data_offset)
2898 /* reset is always permitted */
2900 else if (new_offset > rdev->data_offset) {
2901 /* must not push array size beyond rdev_sectors */
2902 if (new_offset - rdev->data_offset
2903 + mddev->dev_sectors > rdev->sectors)
2906 /* Metadata worries about other space details. */
2908 /* decreasing the offset is inconsistent with a backwards
2911 if (new_offset < rdev->data_offset &&
2912 mddev->reshape_backwards)
2914 /* Increasing offset is inconsistent with forwards
2915 * reshape. reshape_direction should be set to
2916 * 'backwards' first.
2918 if (new_offset > rdev->data_offset &&
2919 !mddev->reshape_backwards)
2922 if (mddev->pers && mddev->persistent &&
2923 !super_types[mddev->major_version]
2924 .allow_new_offset(rdev, new_offset))
2926 rdev->new_data_offset = new_offset;
2927 if (new_offset > rdev->data_offset)
2928 mddev->reshape_backwards = 1;
2929 else if (new_offset < rdev->data_offset)
2930 mddev->reshape_backwards = 0;
2934 static struct rdev_sysfs_entry rdev_new_offset =
2935 __ATTR(new_offset, S_IRUGO|S_IWUSR, new_offset_show, new_offset_store);
2938 rdev_size_show(struct md_rdev *rdev, char *page)
2940 return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2);
2943 static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
2945 /* check if two start/length pairs overlap */
2953 static int strict_blocks_to_sectors(const char *buf, sector_t *sectors)
2955 unsigned long long blocks;
2958 if (strict_strtoull(buf, 10, &blocks) < 0)
2961 if (blocks & 1ULL << (8 * sizeof(blocks) - 1))
2962 return -EINVAL; /* sector conversion overflow */
2965 if (new != blocks * 2)
2966 return -EINVAL; /* unsigned long long to sector_t overflow */
2973 rdev_size_store(struct md_rdev *rdev, const char *buf, size_t len)
2975 struct mddev *my_mddev = rdev->mddev;
2976 sector_t oldsectors = rdev->sectors;
2979 if (strict_blocks_to_sectors(buf, §ors) < 0)
2981 if (rdev->data_offset != rdev->new_data_offset)
2982 return -EINVAL; /* too confusing */
2983 if (my_mddev->pers && rdev->raid_disk >= 0) {
2984 if (my_mddev->persistent) {
2985 sectors = super_types[my_mddev->major_version].
2986 rdev_size_change(rdev, sectors);
2989 } else if (!sectors)
2990 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) -
2992 if (!my_mddev->pers->resize)
2993 /* Cannot change size for RAID0 or Linear etc */
2996 if (sectors < my_mddev->dev_sectors)
2997 return -EINVAL; /* component must fit device */
2999 rdev->sectors = sectors;
3000 if (sectors > oldsectors && my_mddev->external) {
3001 /* need to check that all other rdevs with the same ->bdev
3002 * do not overlap. We need to unlock the mddev to avoid
3003 * a deadlock. We have already changed rdev->sectors, and if
3004 * we have to change it back, we will have the lock again.
3006 struct mddev *mddev;
3008 struct list_head *tmp;
3010 mddev_unlock(my_mddev);
3011 for_each_mddev(mddev, tmp) {
3012 struct md_rdev *rdev2;
3015 rdev_for_each(rdev2, mddev)
3016 if (rdev->bdev == rdev2->bdev &&
3018 overlaps(rdev->data_offset, rdev->sectors,
3024 mddev_unlock(mddev);
3030 mddev_lock(my_mddev);
3032 /* Someone else could have slipped in a size
3033 * change here, but doing so is just silly.
3034 * We put oldsectors back because we *know* it is
3035 * safe, and trust userspace not to race with
3038 rdev->sectors = oldsectors;
3045 static struct rdev_sysfs_entry rdev_size =
3046 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
3049 static ssize_t recovery_start_show(struct md_rdev *rdev, char *page)
3051 unsigned long long recovery_start = rdev->recovery_offset;
3053 if (test_bit(In_sync, &rdev->flags) ||
3054 recovery_start == MaxSector)
3055 return sprintf(page, "none\n");
3057 return sprintf(page, "%llu\n", recovery_start);
3060 static ssize_t recovery_start_store(struct md_rdev *rdev, const char *buf, size_t len)
3062 unsigned long long recovery_start;
3064 if (cmd_match(buf, "none"))
3065 recovery_start = MaxSector;
3066 else if (strict_strtoull(buf, 10, &recovery_start))
3069 if (rdev->mddev->pers &&
3070 rdev->raid_disk >= 0)
3073 rdev->recovery_offset = recovery_start;
3074 if (recovery_start == MaxSector)
3075 set_bit(In_sync, &rdev->flags);
3077 clear_bit(In_sync, &rdev->flags);
3081 static struct rdev_sysfs_entry rdev_recovery_start =
3082 __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store);
3086 badblocks_show(struct badblocks *bb, char *page, int unack);
3088 badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack);
3090 static ssize_t bb_show(struct md_rdev *rdev, char *page)
3092 return badblocks_show(&rdev->badblocks, page, 0);
3094 static ssize_t bb_store(struct md_rdev *rdev, const char *page, size_t len)
3096 int rv = badblocks_store(&rdev->badblocks, page, len, 0);
3097 /* Maybe that ack was all we needed */
3098 if (test_and_clear_bit(BlockedBadBlocks, &rdev->flags))
3099 wake_up(&rdev->blocked_wait);
3102 static struct rdev_sysfs_entry rdev_bad_blocks =
3103 __ATTR(bad_blocks, S_IRUGO|S_IWUSR, bb_show, bb_store);
3106 static ssize_t ubb_show(struct md_rdev *rdev, char *page)
3108 return badblocks_show(&rdev->badblocks, page, 1);
3110 static ssize_t ubb_store(struct md_rdev *rdev, const char *page, size_t len)
3112 return badblocks_store(&rdev->badblocks, page, len, 1);
3114 static struct rdev_sysfs_entry rdev_unack_bad_blocks =
3115 __ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store);
3117 static struct attribute *rdev_default_attrs[] = {
3122 &rdev_new_offset.attr,
3124 &rdev_recovery_start.attr,
3125 &rdev_bad_blocks.attr,
3126 &rdev_unack_bad_blocks.attr,
3130 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
3132 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3133 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3134 struct mddev *mddev = rdev->mddev;
3140 rv = mddev ? mddev_lock(mddev) : -EBUSY;
3142 if (rdev->mddev == NULL)
3145 rv = entry->show(rdev, page);
3146 mddev_unlock(mddev);
3152 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
3153 const char *page, size_t length)
3155 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3156 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3158 struct mddev *mddev = rdev->mddev;
3162 if (!capable(CAP_SYS_ADMIN))
3164 rv = mddev ? mddev_lock(mddev): -EBUSY;
3166 if (rdev->mddev == NULL)
3169 rv = entry->store(rdev, page, length);
3170 mddev_unlock(mddev);
3175 static void rdev_free(struct kobject *ko)
3177 struct md_rdev *rdev = container_of(ko, struct md_rdev, kobj);
3180 static const struct sysfs_ops rdev_sysfs_ops = {
3181 .show = rdev_attr_show,
3182 .store = rdev_attr_store,
3184 static struct kobj_type rdev_ktype = {
3185 .release = rdev_free,
3186 .sysfs_ops = &rdev_sysfs_ops,
3187 .default_attrs = rdev_default_attrs,
3190 int md_rdev_init(struct md_rdev *rdev)
3193 rdev->saved_raid_disk = -1;
3194 rdev->raid_disk = -1;
3196 rdev->data_offset = 0;
3197 rdev->new_data_offset = 0;
3198 rdev->sb_events = 0;
3199 rdev->last_read_error.tv_sec = 0;
3200 rdev->last_read_error.tv_nsec = 0;
3201 rdev->sb_loaded = 0;
3202 rdev->bb_page = NULL;
3203 atomic_set(&rdev->nr_pending, 0);
3204 atomic_set(&rdev->read_errors, 0);
3205 atomic_set(&rdev->corrected_errors, 0);
3207 INIT_LIST_HEAD(&rdev->same_set);
3208 init_waitqueue_head(&rdev->blocked_wait);
3210 /* Add space to store bad block list.
3211 * This reserves the space even on arrays where it cannot
3212 * be used - I wonder if that matters
3214 rdev->badblocks.count = 0;
3215 rdev->badblocks.shift = 0;
3216 rdev->badblocks.page = kmalloc(PAGE_SIZE, GFP_KERNEL);
3217 seqlock_init(&rdev->badblocks.lock);
3218 if (rdev->badblocks.page == NULL)
3223 EXPORT_SYMBOL_GPL(md_rdev_init);
3225 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3227 * mark the device faulty if:
3229 * - the device is nonexistent (zero size)
3230 * - the device has no valid superblock
3232 * a faulty rdev _never_ has rdev->sb set.
3234 static struct md_rdev *md_import_device(dev_t newdev, int super_format, int super_minor)
3236 char b[BDEVNAME_SIZE];
3238 struct md_rdev *rdev;
3241 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
3243 printk(KERN_ERR "md: could not alloc mem for new device!\n");
3244 return ERR_PTR(-ENOMEM);
3247 err = md_rdev_init(rdev);
3250 err = alloc_disk_sb(rdev);
3254 err = lock_rdev(rdev, newdev, super_format == -2);
3258 kobject_init(&rdev->kobj, &rdev_ktype);
3260 size = i_size_read(rdev->bdev->bd_inode) >> BLOCK_SIZE_BITS;
3263 "md: %s has zero or unknown size, marking faulty!\n",
3264 bdevname(rdev->bdev,b));
3269 if (super_format >= 0) {
3270 err = super_types[super_format].
3271 load_super(rdev, NULL, super_minor);
3272 if (err == -EINVAL) {
3274 "md: %s does not have a valid v%d.%d "
3275 "superblock, not importing!\n",
3276 bdevname(rdev->bdev,b),
3277 super_format, super_minor);
3282 "md: could not read %s's sb, not importing!\n",
3283 bdevname(rdev->bdev,b));
3287 if (super_format == -1)
3288 /* hot-add for 0.90, or non-persistent: so no badblocks */
3289 rdev->badblocks.shift = -1;
3296 md_rdev_clear(rdev);
3298 return ERR_PTR(err);
3302 * Check a full RAID array for plausibility
3306 static void analyze_sbs(struct mddev * mddev)
3309 struct md_rdev *rdev, *freshest, *tmp;
3310 char b[BDEVNAME_SIZE];
3313 rdev_for_each_safe(rdev, tmp, mddev)
3314 switch (super_types[mddev->major_version].
3315 load_super(rdev, freshest, mddev->minor_version)) {
3323 "md: fatal superblock inconsistency in %s"
3324 " -- removing from array\n",
3325 bdevname(rdev->bdev,b));
3326 kick_rdev_from_array(rdev);
3330 super_types[mddev->major_version].
3331 validate_super(mddev, freshest);
3334 rdev_for_each_safe(rdev, tmp, mddev) {
3335 if (mddev->max_disks &&
3336 (rdev->desc_nr >= mddev->max_disks ||
3337 i > mddev->max_disks)) {
3339 "md: %s: %s: only %d devices permitted\n",
3340 mdname(mddev), bdevname(rdev->bdev, b),
3342 kick_rdev_from_array(rdev);
3345 if (rdev != freshest)
3346 if (super_types[mddev->major_version].
3347 validate_super(mddev, rdev)) {
3348 printk(KERN_WARNING "md: kicking non-fresh %s"
3350 bdevname(rdev->bdev,b));
3351 kick_rdev_from_array(rdev);
3354 if (mddev->level == LEVEL_MULTIPATH) {
3355 rdev->desc_nr = i++;
3356 rdev->raid_disk = rdev->desc_nr;
3357 set_bit(In_sync, &rdev->flags);
3358 } else if (rdev->raid_disk >= (mddev->raid_disks - min(0, mddev->delta_disks))) {
3359 rdev->raid_disk = -1;
3360 clear_bit(In_sync, &rdev->flags);
3365 /* Read a fixed-point number.
3366 * Numbers in sysfs attributes should be in "standard" units where
3367 * possible, so time should be in seconds.
3368 * However we internally use a a much smaller unit such as
3369 * milliseconds or jiffies.
3370 * This function takes a decimal number with a possible fractional
3371 * component, and produces an integer which is the result of
3372 * multiplying that number by 10^'scale'.
3373 * all without any floating-point arithmetic.
3375 int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale)
3377 unsigned long result = 0;
3379 while (isdigit(*cp) || (*cp == '.' && decimals < 0)) {
3382 else if (decimals < scale) {
3385 result = result * 10 + value;
3397 while (decimals < scale) {
3406 static void md_safemode_timeout(unsigned long data);
3409 safe_delay_show(struct mddev *mddev, char *page)
3411 int msec = (mddev->safemode_delay*1000)/HZ;
3412 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
3415 safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len)
3419 if (strict_strtoul_scaled(cbuf, &msec, 3) < 0)
3422 mddev->safemode_delay = 0;
3424 unsigned long old_delay = mddev->safemode_delay;
3425 mddev->safemode_delay = (msec*HZ)/1000;
3426 if (mddev->safemode_delay == 0)
3427 mddev->safemode_delay = 1;
3428 if (mddev->safemode_delay < old_delay)
3429 md_safemode_timeout((unsigned long)mddev);
3433 static struct md_sysfs_entry md_safe_delay =
3434 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
3437 level_show(struct mddev *mddev, char *page)
3439 struct md_personality *p = mddev->pers;
3441 return sprintf(page, "%s\n", p->name);
3442 else if (mddev->clevel[0])
3443 return sprintf(page, "%s\n", mddev->clevel);
3444 else if (mddev->level != LEVEL_NONE)
3445 return sprintf(page, "%d\n", mddev->level);
3451 level_store(struct mddev *mddev, const char *buf, size_t len)
3455 struct md_personality *pers;
3458 struct md_rdev *rdev;
3460 if (mddev->pers == NULL) {
3463 if (len >= sizeof(mddev->clevel))
3465 strncpy(mddev->clevel, buf, len);
3466 if (mddev->clevel[len-1] == '\n')
3468 mddev->clevel[len] = 0;
3469 mddev->level = LEVEL_NONE;
3473 /* request to change the personality. Need to ensure:
3474 * - array is not engaged in resync/recovery/reshape
3475 * - old personality can be suspended
3476 * - new personality will access other array.
3479 if (mddev->sync_thread ||
3480 mddev->reshape_position != MaxSector ||
3481 mddev->sysfs_active)
3484 if (!mddev->pers->quiesce) {
3485 printk(KERN_WARNING "md: %s: %s does not support online personality change\n",
3486 mdname(mddev), mddev->pers->name);
3490 /* Now find the new personality */
3491 if (len == 0 || len >= sizeof(clevel))
3493 strncpy(clevel, buf, len);
3494 if (clevel[len-1] == '\n')
3497 if (strict_strtol(clevel, 10, &level))
3500 if (request_module("md-%s", clevel) != 0)
3501 request_module("md-level-%s", clevel);
3502 spin_lock(&pers_lock);
3503 pers = find_pers(level, clevel);
3504 if (!pers || !try_module_get(pers->owner)) {
3505 spin_unlock(&pers_lock);
3506 printk(KERN_WARNING "md: personality %s not loaded\n", clevel);
3509 spin_unlock(&pers_lock);
3511 if (pers == mddev->pers) {
3512 /* Nothing to do! */
3513 module_put(pers->owner);
3516 if (!pers->takeover) {
3517 module_put(pers->owner);
3518 printk(KERN_WARNING "md: %s: %s does not support personality takeover\n",
3519 mdname(mddev), clevel);
3523 rdev_for_each(rdev, mddev)
3524 rdev->new_raid_disk = rdev->raid_disk;
3526 /* ->takeover must set new_* and/or delta_disks
3527 * if it succeeds, and may set them when it fails.
3529 priv = pers->takeover(mddev);
3531 mddev->new_level = mddev->level;
3532 mddev->new_layout = mddev->layout;
3533 mddev->new_chunk_sectors = mddev->chunk_sectors;
3534 mddev->raid_disks -= mddev->delta_disks;
3535 mddev->delta_disks = 0;
3536 mddev->reshape_backwards = 0;
3537 module_put(pers->owner);
3538 printk(KERN_WARNING "md: %s: %s would not accept array\n",
3539 mdname(mddev), clevel);
3540 return PTR_ERR(priv);
3543 /* Looks like we have a winner */
3544 mddev_suspend(mddev);
3545 mddev->pers->stop(mddev);
3547 if (mddev->pers->sync_request == NULL &&
3548 pers->sync_request != NULL) {
3549 /* need to add the md_redundancy_group */
3550 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
3552 "md: cannot register extra attributes for %s\n",
3554 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, NULL, "sync_action");
3556 if (mddev->pers->sync_request != NULL &&
3557 pers->sync_request == NULL) {
3558 /* need to remove the md_redundancy_group */
3559 if (mddev->to_remove == NULL)
3560 mddev->to_remove = &md_redundancy_group;
3563 if (mddev->pers->sync_request == NULL &&
3565 /* We are converting from a no-redundancy array
3566 * to a redundancy array and metadata is managed
3567 * externally so we need to be sure that writes
3568 * won't block due to a need to transition
3570 * until external management is started.
3573 mddev->safemode_delay = 0;
3574 mddev->safemode = 0;
3577 rdev_for_each(rdev, mddev) {
3578 if (rdev->raid_disk < 0)
3580 if (rdev->new_raid_disk >= mddev->raid_disks)
3581 rdev->new_raid_disk = -1;
3582 if (rdev->new_raid_disk == rdev->raid_disk)
3584 sysfs_unlink_rdev(mddev, rdev);
3586 rdev_for_each(rdev, mddev) {
3587 if (rdev->raid_disk < 0)
3589 if (rdev->new_raid_disk == rdev->raid_disk)
3591 rdev->raid_disk = rdev->new_raid_disk;
3592 if (rdev->raid_disk < 0)
3593 clear_bit(In_sync, &rdev->flags);
3595 if (sysfs_link_rdev(mddev, rdev))
3596 printk(KERN_WARNING "md: cannot register rd%d"
3597 " for %s after level change\n",
3598 rdev->raid_disk, mdname(mddev));
3602 module_put(mddev->pers->owner);
3604 mddev->private = priv;
3605 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
3606 mddev->level = mddev->new_level;
3607 mddev->layout = mddev->new_layout;
3608 mddev->chunk_sectors = mddev->new_chunk_sectors;
3609 mddev->delta_disks = 0;
3610 mddev->reshape_backwards = 0;
3611 mddev->degraded = 0;
3612 if (mddev->pers->sync_request == NULL) {
3613 /* this is now an array without redundancy, so
3614 * it must always be in_sync
3617 del_timer_sync(&mddev->safemode_timer);
3620 set_bit(MD_CHANGE_DEVS, &mddev->flags);
3621 mddev_resume(mddev);
3622 sysfs_notify(&mddev->kobj, NULL, "level");
3623 md_new_event(mddev);
3627 static struct md_sysfs_entry md_level =
3628 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
3632 layout_show(struct mddev *mddev, char *page)
3634 /* just a number, not meaningful for all levels */
3635 if (mddev->reshape_position != MaxSector &&
3636 mddev->layout != mddev->new_layout)
3637 return sprintf(page, "%d (%d)\n",
3638 mddev->new_layout, mddev->layout);
3639 return sprintf(page, "%d\n", mddev->layout);
3643 layout_store(struct mddev *mddev, const char *buf, size_t len)
3646 unsigned long n = simple_strtoul(buf, &e, 10);
3648 if (!*buf || (*e && *e != '\n'))
3653 if (mddev->pers->check_reshape == NULL)
3655 mddev->new_layout = n;
3656 err = mddev->pers->check_reshape(mddev);
3658 mddev->new_layout = mddev->layout;
3662 mddev->new_layout = n;
3663 if (mddev->reshape_position == MaxSector)
3668 static struct md_sysfs_entry md_layout =
3669 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
3673 raid_disks_show(struct mddev *mddev, char *page)
3675 if (mddev->raid_disks == 0)
3677 if (mddev->reshape_position != MaxSector &&
3678 mddev->delta_disks != 0)
3679 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
3680 mddev->raid_disks - mddev->delta_disks);
3681 return sprintf(page, "%d\n", mddev->raid_disks);
3684 static int update_raid_disks(struct mddev *mddev, int raid_disks);
3687 raid_disks_store(struct mddev *mddev, const char *buf, size_t len)
3691 unsigned long n = simple_strtoul(buf, &e, 10);
3693 if (!*buf || (*e && *e != '\n'))
3697 rv = update_raid_disks(mddev, n);
3698 else if (mddev->reshape_position != MaxSector) {
3699 struct md_rdev *rdev;
3700 int olddisks = mddev->raid_disks - mddev->delta_disks;
3702 rdev_for_each(rdev, mddev) {
3704 rdev->data_offset < rdev->new_data_offset)
3707 rdev->data_offset > rdev->new_data_offset)
3710 mddev->delta_disks = n - olddisks;
3711 mddev->raid_disks = n;
3712 mddev->reshape_backwards = (mddev->delta_disks < 0);
3714 mddev->raid_disks = n;
3715 return rv ? rv : len;
3717 static struct md_sysfs_entry md_raid_disks =
3718 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
3721 chunk_size_show(struct mddev *mddev, char *page)
3723 if (mddev->reshape_position != MaxSector &&
3724 mddev->chunk_sectors != mddev->new_chunk_sectors)
3725 return sprintf(page, "%d (%d)\n",
3726 mddev->new_chunk_sectors << 9,
3727 mddev->chunk_sectors << 9);
3728 return sprintf(page, "%d\n", mddev->chunk_sectors << 9);
3732 chunk_size_store(struct mddev *mddev, const char *buf, size_t len)
3735 unsigned long n = simple_strtoul(buf, &e, 10);
3737 if (!*buf || (*e && *e != '\n'))
3742 if (mddev->pers->check_reshape == NULL)
3744 mddev->new_chunk_sectors = n >> 9;
3745 err = mddev->pers->check_reshape(mddev);
3747 mddev->new_chunk_sectors = mddev->chunk_sectors;
3751 mddev->new_chunk_sectors = n >> 9;
3752 if (mddev->reshape_position == MaxSector)
3753 mddev->chunk_sectors = n >> 9;
3757 static struct md_sysfs_entry md_chunk_size =
3758 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
3761 resync_start_show(struct mddev *mddev, char *page)
3763 if (mddev->recovery_cp == MaxSector)
3764 return sprintf(page, "none\n");
3765 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
3769 resync_start_store(struct mddev *mddev, const char *buf, size_t len)
3772 unsigned long long n = simple_strtoull(buf, &e, 10);
3774 if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
3776 if (cmd_match(buf, "none"))
3778 else if (!*buf || (*e && *e != '\n'))
3781 mddev->recovery_cp = n;
3783 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
3786 static struct md_sysfs_entry md_resync_start =
3787 __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store);
3790 * The array state can be:
3793 * No devices, no size, no level
3794 * Equivalent to STOP_ARRAY ioctl
3796 * May have some settings, but array is not active
3797 * all IO results in error
3798 * When written, doesn't tear down array, but just stops it
3799 * suspended (not supported yet)
3800 * All IO requests will block. The array can be reconfigured.
3801 * Writing this, if accepted, will block until array is quiescent
3803 * no resync can happen. no superblocks get written.
3804 * write requests fail
3806 * like readonly, but behaves like 'clean' on a write request.
3808 * clean - no pending writes, but otherwise active.
3809 * When written to inactive array, starts without resync
3810 * If a write request arrives then
3811 * if metadata is known, mark 'dirty' and switch to 'active'.
3812 * if not known, block and switch to write-pending
3813 * If written to an active array that has pending writes, then fails.
3815 * fully active: IO and resync can be happening.
3816 * When written to inactive array, starts with resync
3819 * clean, but writes are blocked waiting for 'active' to be written.
3822 * like active, but no writes have been seen for a while (100msec).
3825 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
3826 write_pending, active_idle, bad_word};
3827 static char *array_states[] = {
3828 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3829 "write-pending", "active-idle", NULL };
3831 static int match_word(const char *word, char **list)
3834 for (n=0; list[n]; n++)
3835 if (cmd_match(word, list[n]))
3841 array_state_show(struct mddev *mddev, char *page)
3843 enum array_state st = inactive;
3856 else if (test_bit(MD_CHANGE_PENDING, &mddev->flags))
3858 else if (mddev->safemode)
3864 if (list_empty(&mddev->disks) &&
3865 mddev->raid_disks == 0 &&
3866 mddev->dev_sectors == 0)
3871 return sprintf(page, "%s\n", array_states[st]);
3874 static int do_md_stop(struct mddev * mddev, int ro, struct block_device *bdev);
3875 static int md_set_readonly(struct mddev * mddev, struct block_device *bdev);
3876 static int do_md_run(struct mddev * mddev);
3877 static int restart_array(struct mddev *mddev);
3880 array_state_store(struct mddev *mddev, const char *buf, size_t len)
3883 enum array_state st = match_word(buf, array_states);
3888 /* stopping an active array */
3889 err = do_md_stop(mddev, 0, NULL);
3892 /* stopping an active array */
3894 err = do_md_stop(mddev, 2, NULL);
3896 err = 0; /* already inactive */
3899 break; /* not supported yet */
3902 err = md_set_readonly(mddev, NULL);
3905 set_disk_ro(mddev->gendisk, 1);
3906 err = do_md_run(mddev);
3912 err = md_set_readonly(mddev, NULL);
3913 else if (mddev->ro == 1)
3914 err = restart_array(mddev);
3917 set_disk_ro(mddev->gendisk, 0);
3921 err = do_md_run(mddev);
3926 restart_array(mddev);
3927 spin_lock_irq(&mddev->write_lock);
3928 if (atomic_read(&mddev->writes_pending) == 0) {
3929 if (mddev->in_sync == 0) {
3931 if (mddev->safemode == 1)
3932 mddev->safemode = 0;
3933 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
3938 spin_unlock_irq(&mddev->write_lock);
3944 restart_array(mddev);
3945 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
3946 wake_up(&mddev->sb_wait);
3950 set_disk_ro(mddev->gendisk, 0);
3951 err = do_md_run(mddev);
3956 /* these cannot be set */
3962 if (mddev->hold_active == UNTIL_IOCTL)
3963 mddev->hold_active = 0;
3964 sysfs_notify_dirent_safe(mddev->sysfs_state);
3968 static struct md_sysfs_entry md_array_state =
3969 __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
3972 max_corrected_read_errors_show(struct mddev *mddev, char *page) {
3973 return sprintf(page, "%d\n",
3974 atomic_read(&mddev->max_corr_read_errors));
3978 max_corrected_read_errors_store(struct mddev *mddev, const char *buf, size_t len)
3981 unsigned long n = simple_strtoul(buf, &e, 10);
3983 if (*buf && (*e == 0 || *e == '\n')) {
3984 atomic_set(&mddev->max_corr_read_errors, n);
3990 static struct md_sysfs_entry max_corr_read_errors =
3991 __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show,
3992 max_corrected_read_errors_store);
3995 null_show(struct mddev *mddev, char *page)
4001 new_dev_store(struct mddev *mddev, const char *buf, size_t len)
4003 /* buf must be %d:%d\n? giving major and minor numbers */
4004 /* The new device is added to the array.
4005 * If the array has a persistent superblock, we read the
4006 * superblock to initialise info and check validity.
4007 * Otherwise, only checking done is that in bind_rdev_to_array,
4008 * which mainly checks size.
4011 int major = simple_strtoul(buf, &e, 10);
4014 struct md_rdev *rdev;
4017 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
4019 minor = simple_strtoul(e+1, &e, 10);
4020 if (*e && *e != '\n')
4022 dev = MKDEV(major, minor);
4023 if (major != MAJOR(dev) ||
4024 minor != MINOR(dev))
4028 if (mddev->persistent) {
4029 rdev = md_import_device(dev, mddev->major_version,
4030 mddev->minor_version);
4031 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
4032 struct md_rdev *rdev0
4033 = list_entry(mddev->disks.next,
4034 struct md_rdev, same_set);
4035 err = super_types[mddev->major_version]
4036 .load_super(rdev, rdev0, mddev->minor_version);
4040 } else if (mddev->external)
4041 rdev = md_import_device(dev, -2, -1);
4043 rdev = md_import_device(dev, -1, -1);
4046 return PTR_ERR(rdev);
4047 err = bind_rdev_to_array(rdev, mddev);
4051 return err ? err : len;
4054 static struct md_sysfs_entry md_new_device =
4055 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
4058 bitmap_store(struct mddev *mddev, const char *buf, size_t len)
4061 unsigned long chunk, end_chunk;
4065 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
4067 chunk = end_chunk = simple_strtoul(buf, &end, 0);
4068 if (buf == end) break;
4069 if (*end == '-') { /* range */
4071 end_chunk = simple_strtoul(buf, &end, 0);
4072 if (buf == end) break;
4074 if (*end && !isspace(*end)) break;
4075 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
4076 buf = skip_spaces(end);
4078 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
4083 static struct md_sysfs_entry md_bitmap =
4084 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
4087 size_show(struct mddev *mddev, char *page)
4089 return sprintf(page, "%llu\n",
4090 (unsigned long long)mddev->dev_sectors / 2);
4093 static int update_size(struct mddev *mddev, sector_t num_sectors);
4096 size_store(struct mddev *mddev, const char *buf, size_t len)
4098 /* If array is inactive, we can reduce the component size, but
4099 * not increase it (except from 0).
4100 * If array is active, we can try an on-line resize
4103 int err = strict_blocks_to_sectors(buf, §ors);
4108 err = update_size(mddev, sectors);
4109 md_update_sb(mddev, 1);
4111 if (mddev->dev_sectors == 0 ||
4112 mddev->dev_sectors > sectors)
4113 mddev->dev_sectors = sectors;
4117 return err ? err : len;
4120 static struct md_sysfs_entry md_size =
4121 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
4124 /* Metadata version.
4126 * 'none' for arrays with no metadata (good luck...)
4127 * 'external' for arrays with externally managed metadata,
4128 * or N.M for internally known formats
4131 metadata_show(struct mddev *mddev, char *page)
4133 if (mddev->persistent)
4134 return sprintf(page, "%d.%d\n",
4135 mddev->major_version, mddev->minor_version);
4136 else if (mddev->external)
4137 return sprintf(page, "external:%s\n", mddev->metadata_type);
4139 return sprintf(page, "none\n");
4143 metadata_store(struct mddev *mddev, const char *buf, size_t len)
4147 /* Changing the details of 'external' metadata is
4148 * always permitted. Otherwise there must be
4149 * no devices attached to the array.
4151 if (mddev->external && strncmp(buf, "external:", 9) == 0)
4153 else if (!list_empty(&mddev->disks))
4156 if (cmd_match(buf, "none")) {
4157 mddev->persistent = 0;
4158 mddev->external = 0;
4159 mddev->major_version = 0;
4160 mddev->minor_version = 90;
4163 if (strncmp(buf, "external:", 9) == 0) {
4164 size_t namelen = len-9;
4165 if (namelen >= sizeof(mddev->metadata_type))
4166 namelen = sizeof(mddev->metadata_type)-1;
4167 strncpy(mddev->metadata_type, buf+9, namelen);
4168 mddev->metadata_type[namelen] = 0;
4169 if (namelen && mddev->metadata_type[namelen-1] == '\n')
4170 mddev->metadata_type[--namelen] = 0;
4171 mddev->persistent = 0;
4172 mddev->external = 1;
4173 mddev->major_version = 0;
4174 mddev->minor_version = 90;
4177 major = simple_strtoul(buf, &e, 10);
4178 if (e==buf || *e != '.')
4181 minor = simple_strtoul(buf, &e, 10);
4182 if (e==buf || (*e && *e != '\n') )
4184 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
4186 mddev->major_version = major;
4187 mddev->minor_version = minor;
4188 mddev->persistent = 1;
4189 mddev->external = 0;
4193 static struct md_sysfs_entry md_metadata =
4194 __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
4197 action_show(struct mddev *mddev, char *page)
4199 char *type = "idle";
4200 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
4202 else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
4203 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) {
4204 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
4206 else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
4207 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
4209 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
4213 } else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
4216 return sprintf(page, "%s\n", type);
4219 static void reap_sync_thread(struct mddev *mddev);
4222 action_store(struct mddev *mddev, const char *page, size_t len)
4224 if (!mddev->pers || !mddev->pers->sync_request)
4227 if (cmd_match(page, "frozen"))
4228 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4230 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4232 if (cmd_match(page, "idle") || cmd_match(page, "frozen")) {
4233 if (mddev->sync_thread) {
4234 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4235 reap_sync_thread(mddev);
4237 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
4238 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
4240 else if (cmd_match(page, "resync"))
4241 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4242 else if (cmd_match(page, "recover")) {
4243 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
4244 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4245 } else if (cmd_match(page, "reshape")) {
4247 if (mddev->pers->start_reshape == NULL)
4249 err = mddev->pers->start_reshape(mddev);
4252 sysfs_notify(&mddev->kobj, NULL, "degraded");
4254 if (cmd_match(page, "check"))
4255 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
4256 else if (!cmd_match(page, "repair"))
4258 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
4259 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
4261 if (mddev->ro == 2) {
4262 /* A write to sync_action is enough to justify
4263 * canceling read-auto mode
4266 md_wakeup_thread(mddev->sync_thread);
4268 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4269 md_wakeup_thread(mddev->thread);
4270 sysfs_notify_dirent_safe(mddev->sysfs_action);
4275 mismatch_cnt_show(struct mddev *mddev, char *page)
4277 return sprintf(page, "%llu\n",
4278 (unsigned long long)
4279 atomic64_read(&mddev->resync_mismatches));
4282 static struct md_sysfs_entry md_scan_mode =
4283 __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
4286 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
4289 sync_min_show(struct mddev *mddev, char *page)
4291 return sprintf(page, "%d (%s)\n", speed_min(mddev),
4292 mddev->sync_speed_min ? "local": "system");
4296 sync_min_store(struct mddev *mddev, const char *buf, size_t len)
4300 if (strncmp(buf, "system", 6)==0) {
4301 mddev->sync_speed_min = 0;
4304 min = simple_strtoul(buf, &e, 10);
4305 if (buf == e || (*e && *e != '\n') || min <= 0)
4307 mddev->sync_speed_min = min;
4311 static struct md_sysfs_entry md_sync_min =
4312 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
4315 sync_max_show(struct mddev *mddev, char *page)
4317 return sprintf(page, "%d (%s)\n", speed_max(mddev),
4318 mddev->sync_speed_max ? "local": "system");
4322 sync_max_store(struct mddev *mddev, const char *buf, size_t len)
4326 if (strncmp(buf, "system", 6)==0) {
4327 mddev->sync_speed_max = 0;
4330 max = simple_strtoul(buf, &e, 10);
4331 if (buf == e || (*e && *e != '\n') || max <= 0)
4333 mddev->sync_speed_max = max;
4337 static struct md_sysfs_entry md_sync_max =
4338 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
4341 degraded_show(struct mddev *mddev, char *page)
4343 return sprintf(page, "%d\n", mddev->degraded);
4345 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
4348 sync_force_parallel_show(struct mddev *mddev, char *page)
4350 return sprintf(page, "%d\n", mddev->parallel_resync);
4354 sync_force_parallel_store(struct mddev *mddev, const char *buf, size_t len)
4358 if (strict_strtol(buf, 10, &n))
4361 if (n != 0 && n != 1)
4364 mddev->parallel_resync = n;
4366 if (mddev->sync_thread)
4367 wake_up(&resync_wait);
4372 /* force parallel resync, even with shared block devices */
4373 static struct md_sysfs_entry md_sync_force_parallel =
4374 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
4375 sync_force_parallel_show, sync_force_parallel_store);
4378 sync_speed_show(struct mddev *mddev, char *page)
4380 unsigned long resync, dt, db;
4381 if (mddev->curr_resync == 0)
4382 return sprintf(page, "none\n");
4383 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
4384 dt = (jiffies - mddev->resync_mark) / HZ;
4386 db = resync - mddev->resync_mark_cnt;
4387 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
4390 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
4393 sync_completed_show(struct mddev *mddev, char *page)
4395 unsigned long long max_sectors, resync;
4397 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4398 return sprintf(page, "none\n");
4400 if (mddev->curr_resync == 1 ||
4401 mddev->curr_resync == 2)
4402 return sprintf(page, "delayed\n");
4404 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
4405 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
4406 max_sectors = mddev->resync_max_sectors;
4408 max_sectors = mddev->dev_sectors;
4410 resync = mddev->curr_resync_completed;
4411 return sprintf(page, "%llu / %llu\n", resync, max_sectors);
4414 static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed);
4417 min_sync_show(struct mddev *mddev, char *page)
4419 return sprintf(page, "%llu\n",
4420 (unsigned long long)mddev->resync_min);
4423 min_sync_store(struct mddev *mddev, const char *buf, size_t len)
4425 unsigned long long min;
4426 if (strict_strtoull(buf, 10, &min))
4428 if (min > mddev->resync_max)
4430 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4433 /* Must be a multiple of chunk_size */
4434 if (mddev->chunk_sectors) {
4435 sector_t temp = min;
4436 if (sector_div(temp, mddev->chunk_sectors))
4439 mddev->resync_min = min;
4444 static struct md_sysfs_entry md_min_sync =
4445 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
4448 max_sync_show(struct mddev *mddev, char *page)
4450 if (mddev->resync_max == MaxSector)
4451 return sprintf(page, "max\n");
4453 return sprintf(page, "%llu\n",
4454 (unsigned long long)mddev->resync_max);
4457 max_sync_store(struct mddev *mddev, const char *buf, size_t len)
4459 if (strncmp(buf, "max", 3) == 0)
4460 mddev->resync_max = MaxSector;
4462 unsigned long long max;
4463 if (strict_strtoull(buf, 10, &max))
4465 if (max < mddev->resync_min)
4467 if (max < mddev->resync_max &&
4469 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4472 /* Must be a multiple of chunk_size */
4473 if (mddev->chunk_sectors) {
4474 sector_t temp = max;
4475 if (sector_div(temp, mddev->chunk_sectors))
4478 mddev->resync_max = max;
4480 wake_up(&mddev->recovery_wait);
4484 static struct md_sysfs_entry md_max_sync =
4485 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
4488 suspend_lo_show(struct mddev *mddev, char *page)
4490 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
4494 suspend_lo_store(struct mddev *mddev, const char *buf, size_t len)
4497 unsigned long long new = simple_strtoull(buf, &e, 10);
4498 unsigned long long old = mddev->suspend_lo;
4500 if (mddev->pers == NULL ||
4501 mddev->pers->quiesce == NULL)
4503 if (buf == e || (*e && *e != '\n'))
4506 mddev->suspend_lo = new;
4508 /* Shrinking suspended region */
4509 mddev->pers->quiesce(mddev, 2);
4511 /* Expanding suspended region - need to wait */
4512 mddev->pers->quiesce(mddev, 1);
4513 mddev->pers->quiesce(mddev, 0);
4517 static struct md_sysfs_entry md_suspend_lo =
4518 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
4522 suspend_hi_show(struct mddev *mddev, char *page)
4524 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
4528 suspend_hi_store(struct mddev *mddev, const char *buf, size_t len)
4531 unsigned long long new = simple_strtoull(buf, &e, 10);
4532 unsigned long long old = mddev->suspend_hi;
4534 if (mddev->pers == NULL ||
4535 mddev->pers->quiesce == NULL)
4537 if (buf == e || (*e && *e != '\n'))
4540 mddev->suspend_hi = new;
4542 /* Shrinking suspended region */
4543 mddev->pers->quiesce(mddev, 2);
4545 /* Expanding suspended region - need to wait */
4546 mddev->pers->quiesce(mddev, 1);
4547 mddev->pers->quiesce(mddev, 0);
4551 static struct md_sysfs_entry md_suspend_hi =
4552 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
4555 reshape_position_show(struct mddev *mddev, char *page)
4557 if (mddev->reshape_position != MaxSector)
4558 return sprintf(page, "%llu\n",
4559 (unsigned long long)mddev->reshape_position);
4560 strcpy(page, "none\n");
4565 reshape_position_store(struct mddev *mddev, const char *buf, size_t len)
4567 struct md_rdev *rdev;
4569 unsigned long long new = simple_strtoull(buf, &e, 10);
4572 if (buf == e || (*e && *e != '\n'))
4574 mddev->reshape_position = new;
4575 mddev->delta_disks = 0;
4576 mddev->reshape_backwards = 0;
4577 mddev->new_level = mddev->level;
4578 mddev->new_layout = mddev->layout;
4579 mddev->new_chunk_sectors = mddev->chunk_sectors;
4580 rdev_for_each(rdev, mddev)
4581 rdev->new_data_offset = rdev->data_offset;
4585 static struct md_sysfs_entry md_reshape_position =
4586 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
4587 reshape_position_store);
4590 reshape_direction_show(struct mddev *mddev, char *page)
4592 return sprintf(page, "%s\n",
4593 mddev->reshape_backwards ? "backwards" : "forwards");
4597 reshape_direction_store(struct mddev *mddev, const char *buf, size_t len)
4600 if (cmd_match(buf, "forwards"))
4602 else if (cmd_match(buf, "backwards"))
4606 if (mddev->reshape_backwards == backwards)
4609 /* check if we are allowed to change */
4610 if (mddev->delta_disks)
4613 if (mddev->persistent &&
4614 mddev->major_version == 0)
4617 mddev->reshape_backwards = backwards;
4621 static struct md_sysfs_entry md_reshape_direction =
4622 __ATTR(reshape_direction, S_IRUGO|S_IWUSR, reshape_direction_show,
4623 reshape_direction_store);
4626 array_size_show(struct mddev *mddev, char *page)
4628 if (mddev->external_size)
4629 return sprintf(page, "%llu\n",
4630 (unsigned long long)mddev->array_sectors/2);
4632 return sprintf(page, "default\n");
4636 array_size_store(struct mddev *mddev, const char *buf, size_t len)
4640 if (strncmp(buf, "default", 7) == 0) {
4642 sectors = mddev->pers->size(mddev, 0, 0);
4644 sectors = mddev->array_sectors;
4646 mddev->external_size = 0;
4648 if (strict_blocks_to_sectors(buf, §ors) < 0)
4650 if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors)
4653 mddev->external_size = 1;
4656 mddev->array_sectors = sectors;
4658 set_capacity(mddev->gendisk, mddev->array_sectors);
4659 revalidate_disk(mddev->gendisk);
4664 static struct md_sysfs_entry md_array_size =
4665 __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show,
4668 static struct attribute *md_default_attrs[] = {
4671 &md_raid_disks.attr,
4672 &md_chunk_size.attr,
4674 &md_resync_start.attr,
4676 &md_new_device.attr,
4677 &md_safe_delay.attr,
4678 &md_array_state.attr,
4679 &md_reshape_position.attr,
4680 &md_reshape_direction.attr,
4681 &md_array_size.attr,
4682 &max_corr_read_errors.attr,
4686 static struct attribute *md_redundancy_attrs[] = {
4688 &md_mismatches.attr,
4691 &md_sync_speed.attr,
4692 &md_sync_force_parallel.attr,
4693 &md_sync_completed.attr,
4696 &md_suspend_lo.attr,
4697 &md_suspend_hi.attr,
4702 static struct attribute_group md_redundancy_group = {
4704 .attrs = md_redundancy_attrs,
4709 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
4711 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
4712 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
4717 spin_lock(&all_mddevs_lock);
4718 if (list_empty(&mddev->all_mddevs)) {
4719 spin_unlock(&all_mddevs_lock);
4723 spin_unlock(&all_mddevs_lock);
4725 rv = mddev_lock(mddev);
4727 rv = entry->show(mddev, page);
4728 mddev_unlock(mddev);
4735 md_attr_store(struct kobject *kobj, struct attribute *attr,
4736 const char *page, size_t length)
4738 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
4739 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
4744 if (!capable(CAP_SYS_ADMIN))
4746 spin_lock(&all_mddevs_lock);
4747 if (list_empty(&mddev->all_mddevs)) {
4748 spin_unlock(&all_mddevs_lock);
4752 spin_unlock(&all_mddevs_lock);
4753 if (entry->store == new_dev_store)
4754 flush_workqueue(md_misc_wq);
4755 rv = mddev_lock(mddev);
4757 rv = entry->store(mddev, page, length);
4758 mddev_unlock(mddev);
4764 static void md_free(struct kobject *ko)
4766 struct mddev *mddev = container_of(ko, struct mddev, kobj);
4768 if (mddev->sysfs_state)
4769 sysfs_put(mddev->sysfs_state);
4771 if (mddev->gendisk) {
4772 del_gendisk(mddev->gendisk);
4773 put_disk(mddev->gendisk);
4776 blk_cleanup_queue(mddev->queue);
4781 static const struct sysfs_ops md_sysfs_ops = {
4782 .show = md_attr_show,
4783 .store = md_attr_store,
4785 static struct kobj_type md_ktype = {
4787 .sysfs_ops = &md_sysfs_ops,
4788 .default_attrs = md_default_attrs,
4793 static void mddev_delayed_delete(struct work_struct *ws)
4795 struct mddev *mddev = container_of(ws, struct mddev, del_work);
4797 sysfs_remove_group(&mddev->kobj, &md_bitmap_group);
4798 kobject_del(&mddev->kobj);
4799 kobject_put(&mddev->kobj);
4802 static int md_alloc(dev_t dev, char *name)
4804 static DEFINE_MUTEX(disks_mutex);
4805 struct mddev *mddev = mddev_find(dev);
4806 struct gendisk *disk;
4815 partitioned = (MAJOR(mddev->unit) != MD_MAJOR);
4816 shift = partitioned ? MdpMinorShift : 0;
4817 unit = MINOR(mddev->unit) >> shift;
4819 /* wait for any previous instance of this device to be
4820 * completely removed (mddev_delayed_delete).
4822 flush_workqueue(md_misc_wq);
4824 mutex_lock(&disks_mutex);
4830 /* Need to ensure that 'name' is not a duplicate.
4832 struct mddev *mddev2;
4833 spin_lock(&all_mddevs_lock);
4835 list_for_each_entry(mddev2, &all_mddevs, all_mddevs)
4836 if (mddev2->gendisk &&
4837 strcmp(mddev2->gendisk->disk_name, name) == 0) {
4838 spin_unlock(&all_mddevs_lock);
4841 spin_unlock(&all_mddevs_lock);
4845 mddev->queue = blk_alloc_queue(GFP_KERNEL);
4848 mddev->queue->queuedata = mddev;
4850 blk_queue_make_request(mddev->queue, md_make_request);
4851 blk_set_stacking_limits(&mddev->queue->limits);
4853 disk = alloc_disk(1 << shift);
4855 blk_cleanup_queue(mddev->queue);
4856 mddev->queue = NULL;
4859 disk->major = MAJOR(mddev->unit);
4860 disk->first_minor = unit << shift;
4862 strcpy(disk->disk_name, name);
4863 else if (partitioned)
4864 sprintf(disk->disk_name, "md_d%d", unit);
4866 sprintf(disk->disk_name, "md%d", unit);
4867 disk->fops = &md_fops;
4868 disk->private_data = mddev;
4869 disk->queue = mddev->queue;
4870 blk_queue_flush(mddev->queue, REQ_FLUSH | REQ_FUA);
4871 /* Allow extended partitions. This makes the
4872 * 'mdp' device redundant, but we can't really
4875 disk->flags |= GENHD_FL_EXT_DEVT;
4876 mddev->gendisk = disk;
4877 /* As soon as we call add_disk(), another thread could get
4878 * through to md_open, so make sure it doesn't get too far
4880 mutex_lock(&mddev->open_mutex);
4883 error = kobject_init_and_add(&mddev->kobj, &md_ktype,
4884 &disk_to_dev(disk)->kobj, "%s", "md");
4886 /* This isn't possible, but as kobject_init_and_add is marked
4887 * __must_check, we must do something with the result
4889 printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
4893 if (mddev->kobj.sd &&
4894 sysfs_create_group(&mddev->kobj, &md_bitmap_group))
4895 printk(KERN_DEBUG "pointless warning\n");
4896 mutex_unlock(&mddev->open_mutex);
4898 mutex_unlock(&disks_mutex);
4899 if (!error && mddev->kobj.sd) {
4900 kobject_uevent(&mddev->kobj, KOBJ_ADD);
4901 mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state");
4907 static struct kobject *md_probe(dev_t dev, int *part, void *data)
4909 md_alloc(dev, NULL);
4913 static int add_named_array(const char *val, struct kernel_param *kp)
4915 /* val must be "md_*" where * is not all digits.
4916 * We allocate an array with a large free minor number, and
4917 * set the name to val. val must not already be an active name.
4919 int len = strlen(val);
4920 char buf[DISK_NAME_LEN];
4922 while (len && val[len-1] == '\n')
4924 if (len >= DISK_NAME_LEN)
4926 strlcpy(buf, val, len+1);
4927 if (strncmp(buf, "md_", 3) != 0)
4929 return md_alloc(0, buf);
4932 static void md_safemode_timeout(unsigned long data)
4934 struct mddev *mddev = (struct mddev *) data;
4936 if (!atomic_read(&mddev->writes_pending)) {
4937 mddev->safemode = 1;
4938 if (mddev->external)
4939 sysfs_notify_dirent_safe(mddev->sysfs_state);
4941 md_wakeup_thread(mddev->thread);
4944 static int start_dirty_degraded;
4946 int md_run(struct mddev *mddev)
4949 struct md_rdev *rdev;
4950 struct md_personality *pers;
4952 if (list_empty(&mddev->disks))
4953 /* cannot run an array with no devices.. */
4958 /* Cannot run until previous stop completes properly */
4959 if (mddev->sysfs_active)
4963 * Analyze all RAID superblock(s)
4965 if (!mddev->raid_disks) {
4966 if (!mddev->persistent)
4971 if (mddev->level != LEVEL_NONE)
4972 request_module("md-level-%d", mddev->level);
4973 else if (mddev->clevel[0])
4974 request_module("md-%s", mddev->clevel);
4977 * Drop all container device buffers, from now on
4978 * the only valid external interface is through the md
4981 rdev_for_each(rdev, mddev) {
4982 if (test_bit(Faulty, &rdev->flags))
4984 sync_blockdev(rdev->bdev);
4985 invalidate_bdev(rdev->bdev);
4987 /* perform some consistency tests on the device.
4988 * We don't want the data to overlap the metadata,
4989 * Internal Bitmap issues have been handled elsewhere.
4991 if (rdev->meta_bdev) {
4992 /* Nothing to check */;
4993 } else if (rdev->data_offset < rdev->sb_start) {
4994 if (mddev->dev_sectors &&
4995 rdev->data_offset + mddev->dev_sectors
4997 printk("md: %s: data overlaps metadata\n",
5002 if (rdev->sb_start + rdev->sb_size/512
5003 > rdev->data_offset) {
5004 printk("md: %s: metadata overlaps data\n",
5009 sysfs_notify_dirent_safe(rdev->sysfs_state);
5012 if (mddev->bio_set == NULL)
5013 mddev->bio_set = bioset_create(BIO_POOL_SIZE, 0);
5015 spin_lock(&pers_lock);
5016 pers = find_pers(mddev->level, mddev->clevel);
5017 if (!pers || !try_module_get(pers->owner)) {
5018 spin_unlock(&pers_lock);
5019 if (mddev->level != LEVEL_NONE)
5020 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
5023 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
5028 spin_unlock(&pers_lock);
5029 if (mddev->level != pers->level) {
5030 mddev->level = pers->level;
5031 mddev->new_level = pers->level;
5033 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
5035 if (mddev->reshape_position != MaxSector &&
5036 pers->start_reshape == NULL) {
5037 /* This personality cannot handle reshaping... */
5039 module_put(pers->owner);
5043 if (pers->sync_request) {
5044 /* Warn if this is a potentially silly
5047 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
5048 struct md_rdev *rdev2;
5051 rdev_for_each(rdev, mddev)
5052 rdev_for_each(rdev2, mddev) {
5054 rdev->bdev->bd_contains ==
5055 rdev2->bdev->bd_contains) {
5057 "%s: WARNING: %s appears to be"
5058 " on the same physical disk as"
5061 bdevname(rdev->bdev,b),
5062 bdevname(rdev2->bdev,b2));
5069 "True protection against single-disk"
5070 " failure might be compromised.\n");
5073 mddev->recovery = 0;
5074 /* may be over-ridden by personality */
5075 mddev->resync_max_sectors = mddev->dev_sectors;
5077 mddev->ok_start_degraded = start_dirty_degraded;
5079 if (start_readonly && mddev->ro == 0)
5080 mddev->ro = 2; /* read-only, but switch on first write */
5082 err = mddev->pers->run(mddev);
5084 printk(KERN_ERR "md: pers->run() failed ...\n");
5085 else if (mddev->pers->size(mddev, 0, 0) < mddev->array_sectors) {
5086 WARN_ONCE(!mddev->external_size, "%s: default size too small,"
5087 " but 'external_size' not in effect?\n", __func__);
5089 "md: invalid array_size %llu > default size %llu\n",
5090 (unsigned long long)mddev->array_sectors / 2,
5091 (unsigned long long)mddev->pers->size(mddev, 0, 0) / 2);
5093 mddev->pers->stop(mddev);
5095 if (err == 0 && mddev->pers->sync_request &&
5096 (mddev->bitmap_info.file || mddev->bitmap_info.offset)) {
5097 err = bitmap_create(mddev);
5099 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
5100 mdname(mddev), err);
5101 mddev->pers->stop(mddev);
5105 module_put(mddev->pers->owner);
5107 bitmap_destroy(mddev);
5110 if (mddev->pers->sync_request) {
5111 if (mddev->kobj.sd &&
5112 sysfs_create_group(&mddev->kobj, &md_redundancy_group))
5114 "md: cannot register extra attributes for %s\n",
5116 mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action");
5117 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
5120 atomic_set(&mddev->writes_pending,0);
5121 atomic_set(&mddev->max_corr_read_errors,
5122 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS);
5123 mddev->safemode = 0;
5124 mddev->safemode_timer.function = md_safemode_timeout;
5125 mddev->safemode_timer.data = (unsigned long) mddev;
5126 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
5130 rdev_for_each(rdev, mddev)
5131 if (rdev->raid_disk >= 0)
5132 if (sysfs_link_rdev(mddev, rdev))
5133 /* failure here is OK */;
5135 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5138 md_update_sb(mddev, 0);
5140 md_new_event(mddev);
5141 sysfs_notify_dirent_safe(mddev->sysfs_state);
5142 sysfs_notify_dirent_safe(mddev->sysfs_action);
5143 sysfs_notify(&mddev->kobj, NULL, "degraded");
5146 EXPORT_SYMBOL_GPL(md_run);
5148 static int do_md_run(struct mddev *mddev)
5152 err = md_run(mddev);
5155 err = bitmap_load(mddev);
5157 bitmap_destroy(mddev);
5161 md_wakeup_thread(mddev->thread);
5162 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
5164 set_capacity(mddev->gendisk, mddev->array_sectors);
5165 revalidate_disk(mddev->gendisk);
5167 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
5172 static int restart_array(struct mddev *mddev)
5174 struct gendisk *disk = mddev->gendisk;
5176 /* Complain if it has no devices */
5177 if (list_empty(&mddev->disks))
5183 mddev->safemode = 0;
5185 set_disk_ro(disk, 0);
5186 printk(KERN_INFO "md: %s switched to read-write mode.\n",
5188 /* Kick recovery or resync if necessary */
5189 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5190 md_wakeup_thread(mddev->thread);
5191 md_wakeup_thread(mddev->sync_thread);
5192 sysfs_notify_dirent_safe(mddev->sysfs_state);
5196 /* similar to deny_write_access, but accounts for our holding a reference
5197 * to the file ourselves */
5198 static int deny_bitmap_write_access(struct file * file)
5200 struct inode *inode = file->f_mapping->host;
5202 spin_lock(&inode->i_lock);
5203 if (atomic_read(&inode->i_writecount) > 1) {
5204 spin_unlock(&inode->i_lock);
5207 atomic_set(&inode->i_writecount, -1);
5208 spin_unlock(&inode->i_lock);
5213 void restore_bitmap_write_access(struct file *file)
5215 struct inode *inode = file->f_mapping->host;
5217 spin_lock(&inode->i_lock);
5218 atomic_set(&inode->i_writecount, 1);
5219 spin_unlock(&inode->i_lock);
5222 static void md_clean(struct mddev *mddev)
5224 mddev->array_sectors = 0;
5225 mddev->external_size = 0;
5226 mddev->dev_sectors = 0;
5227 mddev->raid_disks = 0;
5228 mddev->recovery_cp = 0;
5229 mddev->resync_min = 0;
5230 mddev->resync_max = MaxSector;
5231 mddev->reshape_position = MaxSector;
5232 mddev->external = 0;
5233 mddev->persistent = 0;
5234 mddev->level = LEVEL_NONE;
5235 mddev->clevel[0] = 0;
5238 mddev->metadata_type[0] = 0;
5239 mddev->chunk_sectors = 0;
5240 mddev->ctime = mddev->utime = 0;
5242 mddev->max_disks = 0;
5244 mddev->can_decrease_events = 0;
5245 mddev->delta_disks = 0;
5246 mddev->reshape_backwards = 0;
5247 mddev->new_level = LEVEL_NONE;
5248 mddev->new_layout = 0;
5249 mddev->new_chunk_sectors = 0;
5250 mddev->curr_resync = 0;
5251 atomic64_set(&mddev->resync_mismatches, 0);
5252 mddev->suspend_lo = mddev->suspend_hi = 0;
5253 mddev->sync_speed_min = mddev->sync_speed_max = 0;
5254 mddev->recovery = 0;
5257 mddev->degraded = 0;
5258 mddev->safemode = 0;
5259 mddev->merge_check_needed = 0;
5260 mddev->bitmap_info.offset = 0;
5261 mddev->bitmap_info.default_offset = 0;
5262 mddev->bitmap_info.default_space = 0;
5263 mddev->bitmap_info.chunksize = 0;
5264 mddev->bitmap_info.daemon_sleep = 0;
5265 mddev->bitmap_info.max_write_behind = 0;
5268 static void __md_stop_writes(struct mddev *mddev)
5270 if (mddev->sync_thread) {
5271 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5272 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5273 reap_sync_thread(mddev);
5276 del_timer_sync(&mddev->safemode_timer);
5278 bitmap_flush(mddev);
5279 md_super_wait(mddev);
5281 if (!mddev->in_sync || mddev->flags) {
5282 /* mark array as shutdown cleanly */
5284 md_update_sb(mddev, 1);
5288 void md_stop_writes(struct mddev *mddev)
5291 __md_stop_writes(mddev);
5292 mddev_unlock(mddev);
5294 EXPORT_SYMBOL_GPL(md_stop_writes);
5296 static void __md_stop(struct mddev *mddev)
5299 mddev->pers->stop(mddev);
5300 if (mddev->pers->sync_request && mddev->to_remove == NULL)
5301 mddev->to_remove = &md_redundancy_group;
5302 module_put(mddev->pers->owner);
5304 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5307 void md_stop(struct mddev *mddev)
5309 /* stop the array and free an attached data structures.
5310 * This is called from dm-raid
5313 bitmap_destroy(mddev);
5315 bioset_free(mddev->bio_set);
5318 EXPORT_SYMBOL_GPL(md_stop);
5320 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev)
5323 mutex_lock(&mddev->open_mutex);
5324 if (atomic_read(&mddev->openers) > !!bdev) {
5325 printk("md: %s still in use.\n",mdname(mddev));
5330 sync_blockdev(bdev);
5332 __md_stop_writes(mddev);
5338 set_disk_ro(mddev->gendisk, 1);
5339 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5340 sysfs_notify_dirent_safe(mddev->sysfs_state);
5344 mutex_unlock(&mddev->open_mutex);
5349 * 0 - completely stop and dis-assemble array
5350 * 2 - stop but do not disassemble array
5352 static int do_md_stop(struct mddev * mddev, int mode,
5353 struct block_device *bdev)
5355 struct gendisk *disk = mddev->gendisk;
5356 struct md_rdev *rdev;
5358 mutex_lock(&mddev->open_mutex);
5359 if (atomic_read(&mddev->openers) > !!bdev ||
5360 mddev->sysfs_active) {
5361 printk("md: %s still in use.\n",mdname(mddev));
5362 mutex_unlock(&mddev->open_mutex);
5366 /* It is possible IO was issued on some other
5367 * open file which was closed before we took ->open_mutex.
5368 * As that was not the last close __blkdev_put will not
5369 * have called sync_blockdev, so we must.
5371 sync_blockdev(bdev);
5375 set_disk_ro(disk, 0);
5377 __md_stop_writes(mddev);
5379 mddev->queue->merge_bvec_fn = NULL;
5380 mddev->queue->backing_dev_info.congested_fn = NULL;
5382 /* tell userspace to handle 'inactive' */
5383 sysfs_notify_dirent_safe(mddev->sysfs_state);
5385 rdev_for_each(rdev, mddev)
5386 if (rdev->raid_disk >= 0)
5387 sysfs_unlink_rdev(mddev, rdev);
5389 set_capacity(disk, 0);
5390 mutex_unlock(&mddev->open_mutex);
5392 revalidate_disk(disk);
5397 mutex_unlock(&mddev->open_mutex);
5399 * Free resources if final stop
5402 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
5404 bitmap_destroy(mddev);
5405 if (mddev->bitmap_info.file) {
5406 restore_bitmap_write_access(mddev->bitmap_info.file);
5407 fput(mddev->bitmap_info.file);
5408 mddev->bitmap_info.file = NULL;
5410 mddev->bitmap_info.offset = 0;
5412 export_array(mddev);
5415 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
5416 if (mddev->hold_active == UNTIL_STOP)
5417 mddev->hold_active = 0;
5419 blk_integrity_unregister(disk);
5420 md_new_event(mddev);
5421 sysfs_notify_dirent_safe(mddev->sysfs_state);
5426 static void autorun_array(struct mddev *mddev)
5428 struct md_rdev *rdev;
5431 if (list_empty(&mddev->disks))
5434 printk(KERN_INFO "md: running: ");
5436 rdev_for_each(rdev, mddev) {
5437 char b[BDEVNAME_SIZE];
5438 printk("<%s>", bdevname(rdev->bdev,b));
5442 err = do_md_run(mddev);
5444 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
5445 do_md_stop(mddev, 0, NULL);
5450 * lets try to run arrays based on all disks that have arrived
5451 * until now. (those are in pending_raid_disks)
5453 * the method: pick the first pending disk, collect all disks with
5454 * the same UUID, remove all from the pending list and put them into
5455 * the 'same_array' list. Then order this list based on superblock
5456 * update time (freshest comes first), kick out 'old' disks and
5457 * compare superblocks. If everything's fine then run it.
5459 * If "unit" is allocated, then bump its reference count
5461 static void autorun_devices(int part)
5463 struct md_rdev *rdev0, *rdev, *tmp;
5464 struct mddev *mddev;
5465 char b[BDEVNAME_SIZE];
5467 printk(KERN_INFO "md: autorun ...\n");
5468 while (!list_empty(&pending_raid_disks)) {
5471 LIST_HEAD(candidates);
5472 rdev0 = list_entry(pending_raid_disks.next,
5473 struct md_rdev, same_set);
5475 printk(KERN_INFO "md: considering %s ...\n",
5476 bdevname(rdev0->bdev,b));
5477 INIT_LIST_HEAD(&candidates);
5478 rdev_for_each_list(rdev, tmp, &pending_raid_disks)
5479 if (super_90_load(rdev, rdev0, 0) >= 0) {
5480 printk(KERN_INFO "md: adding %s ...\n",
5481 bdevname(rdev->bdev,b));
5482 list_move(&rdev->same_set, &candidates);
5485 * now we have a set of devices, with all of them having
5486 * mostly sane superblocks. It's time to allocate the
5490 dev = MKDEV(mdp_major,
5491 rdev0->preferred_minor << MdpMinorShift);
5492 unit = MINOR(dev) >> MdpMinorShift;
5494 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
5497 if (rdev0->preferred_minor != unit) {
5498 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
5499 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
5503 md_probe(dev, NULL, NULL);
5504 mddev = mddev_find(dev);
5505 if (!mddev || !mddev->gendisk) {
5509 "md: cannot allocate memory for md drive.\n");
5512 if (mddev_lock(mddev))
5513 printk(KERN_WARNING "md: %s locked, cannot run\n",
5515 else if (mddev->raid_disks || mddev->major_version
5516 || !list_empty(&mddev->disks)) {
5518 "md: %s already running, cannot run %s\n",
5519 mdname(mddev), bdevname(rdev0->bdev,b));
5520 mddev_unlock(mddev);
5522 printk(KERN_INFO "md: created %s\n", mdname(mddev));
5523 mddev->persistent = 1;
5524 rdev_for_each_list(rdev, tmp, &candidates) {
5525 list_del_init(&rdev->same_set);
5526 if (bind_rdev_to_array(rdev, mddev))
5529 autorun_array(mddev);
5530 mddev_unlock(mddev);
5532 /* on success, candidates will be empty, on error
5535 rdev_for_each_list(rdev, tmp, &candidates) {
5536 list_del_init(&rdev->same_set);
5541 printk(KERN_INFO "md: ... autorun DONE.\n");
5543 #endif /* !MODULE */
5545 static int get_version(void __user * arg)
5549 ver.major = MD_MAJOR_VERSION;
5550 ver.minor = MD_MINOR_VERSION;
5551 ver.patchlevel = MD_PATCHLEVEL_VERSION;
5553 if (copy_to_user(arg, &ver, sizeof(ver)))
5559 static int get_array_info(struct mddev * mddev, void __user * arg)
5561 mdu_array_info_t info;
5562 int nr,working,insync,failed,spare;
5563 struct md_rdev *rdev;
5565 nr = working = insync = failed = spare = 0;
5567 rdev_for_each_rcu(rdev, mddev) {
5569 if (test_bit(Faulty, &rdev->flags))
5573 if (test_bit(In_sync, &rdev->flags))
5581 info.major_version = mddev->major_version;
5582 info.minor_version = mddev->minor_version;
5583 info.patch_version = MD_PATCHLEVEL_VERSION;
5584 info.ctime = mddev->ctime;
5585 info.level = mddev->level;
5586 info.size = mddev->dev_sectors / 2;
5587 if (info.size != mddev->dev_sectors / 2) /* overflow */
5590 info.raid_disks = mddev->raid_disks;
5591 info.md_minor = mddev->md_minor;
5592 info.not_persistent= !mddev->persistent;
5594 info.utime = mddev->utime;
5597 info.state = (1<<MD_SB_CLEAN);
5598 if (mddev->bitmap && mddev->bitmap_info.offset)
5599 info.state = (1<<MD_SB_BITMAP_PRESENT);
5600 info.active_disks = insync;
5601 info.working_disks = working;
5602 info.failed_disks = failed;
5603 info.spare_disks = spare;
5605 info.layout = mddev->layout;
5606 info.chunk_size = mddev->chunk_sectors << 9;
5608 if (copy_to_user(arg, &info, sizeof(info)))
5614 static int get_bitmap_file(struct mddev * mddev, void __user * arg)
5616 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
5617 char *ptr, *buf = NULL;
5620 if (md_allow_write(mddev))
5621 file = kmalloc(sizeof(*file), GFP_NOIO);
5623 file = kmalloc(sizeof(*file), GFP_KERNEL);
5628 /* bitmap disabled, zero the first byte and copy out */
5629 if (!mddev->bitmap || !mddev->bitmap->storage.file) {
5630 file->pathname[0] = '\0';
5634 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
5638 ptr = d_path(&mddev->bitmap->storage.file->f_path,
5639 buf, sizeof(file->pathname));
5643 strcpy(file->pathname, ptr);
5647 if (copy_to_user(arg, file, sizeof(*file)))
5655 static int get_disk_info(struct mddev * mddev, void __user * arg)
5657 mdu_disk_info_t info;
5658 struct md_rdev *rdev;
5660 if (copy_from_user(&info, arg, sizeof(info)))
5664 rdev = find_rdev_nr_rcu(mddev, info.number);
5666 info.major = MAJOR(rdev->bdev->bd_dev);
5667 info.minor = MINOR(rdev->bdev->bd_dev);
5668 info.raid_disk = rdev->raid_disk;
5670 if (test_bit(Faulty, &rdev->flags))
5671 info.state |= (1<<MD_DISK_FAULTY);
5672 else if (test_bit(In_sync, &rdev->flags)) {
5673 info.state |= (1<<MD_DISK_ACTIVE);
5674 info.state |= (1<<MD_DISK_SYNC);
5676 if (test_bit(WriteMostly, &rdev->flags))
5677 info.state |= (1<<MD_DISK_WRITEMOSTLY);
5679 info.major = info.minor = 0;
5680 info.raid_disk = -1;
5681 info.state = (1<<MD_DISK_REMOVED);
5685 if (copy_to_user(arg, &info, sizeof(info)))
5691 static int add_new_disk(struct mddev * mddev, mdu_disk_info_t *info)
5693 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
5694 struct md_rdev *rdev;
5695 dev_t dev = MKDEV(info->major,info->minor);
5697 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
5700 if (!mddev->raid_disks) {
5702 /* expecting a device which has a superblock */
5703 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
5706 "md: md_import_device returned %ld\n",
5708 return PTR_ERR(rdev);
5710 if (!list_empty(&mddev->disks)) {
5711 struct md_rdev *rdev0
5712 = list_entry(mddev->disks.next,
5713 struct md_rdev, same_set);
5714 err = super_types[mddev->major_version]
5715 .load_super(rdev, rdev0, mddev->minor_version);
5718 "md: %s has different UUID to %s\n",
5719 bdevname(rdev->bdev,b),
5720 bdevname(rdev0->bdev,b2));
5725 err = bind_rdev_to_array(rdev, mddev);
5732 * add_new_disk can be used once the array is assembled
5733 * to add "hot spares". They must already have a superblock
5738 if (!mddev->pers->hot_add_disk) {
5740 "%s: personality does not support diskops!\n",
5744 if (mddev->persistent)
5745 rdev = md_import_device(dev, mddev->major_version,
5746 mddev->minor_version);
5748 rdev = md_import_device(dev, -1, -1);
5751 "md: md_import_device returned %ld\n",
5753 return PTR_ERR(rdev);
5755 /* set saved_raid_disk if appropriate */
5756 if (!mddev->persistent) {
5757 if (info->state & (1<<MD_DISK_SYNC) &&
5758 info->raid_disk < mddev->raid_disks) {
5759 rdev->raid_disk = info->raid_disk;
5760 set_bit(In_sync, &rdev->flags);
5762 rdev->raid_disk = -1;
5764 super_types[mddev->major_version].
5765 validate_super(mddev, rdev);
5766 if ((info->state & (1<<MD_DISK_SYNC)) &&
5767 rdev->raid_disk != info->raid_disk) {
5768 /* This was a hot-add request, but events doesn't
5769 * match, so reject it.
5775 if (test_bit(In_sync, &rdev->flags))
5776 rdev->saved_raid_disk = rdev->raid_disk;
5778 rdev->saved_raid_disk = -1;
5780 clear_bit(In_sync, &rdev->flags); /* just to be sure */
5781 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
5782 set_bit(WriteMostly, &rdev->flags);
5784 clear_bit(WriteMostly, &rdev->flags);
5786 rdev->raid_disk = -1;
5787 err = bind_rdev_to_array(rdev, mddev);
5788 if (!err && !mddev->pers->hot_remove_disk) {
5789 /* If there is hot_add_disk but no hot_remove_disk
5790 * then added disks for geometry changes,
5791 * and should be added immediately.
5793 super_types[mddev->major_version].
5794 validate_super(mddev, rdev);
5795 err = mddev->pers->hot_add_disk(mddev, rdev);
5797 unbind_rdev_from_array(rdev);
5802 sysfs_notify_dirent_safe(rdev->sysfs_state);
5804 md_update_sb(mddev, 1);
5805 if (mddev->degraded)
5806 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
5807 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5809 md_new_event(mddev);
5810 md_wakeup_thread(mddev->thread);
5814 /* otherwise, add_new_disk is only allowed
5815 * for major_version==0 superblocks
5817 if (mddev->major_version != 0) {
5818 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
5823 if (!(info->state & (1<<MD_DISK_FAULTY))) {
5825 rdev = md_import_device(dev, -1, 0);
5828 "md: error, md_import_device() returned %ld\n",
5830 return PTR_ERR(rdev);
5832 rdev->desc_nr = info->number;
5833 if (info->raid_disk < mddev->raid_disks)
5834 rdev->raid_disk = info->raid_disk;
5836 rdev->raid_disk = -1;
5838 if (rdev->raid_disk < mddev->raid_disks)
5839 if (info->state & (1<<MD_DISK_SYNC))
5840 set_bit(In_sync, &rdev->flags);
5842 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
5843 set_bit(WriteMostly, &rdev->flags);
5845 if (!mddev->persistent) {
5846 printk(KERN_INFO "md: nonpersistent superblock ...\n");
5847 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
5849 rdev->sb_start = calc_dev_sboffset(rdev);
5850 rdev->sectors = rdev->sb_start;
5852 err = bind_rdev_to_array(rdev, mddev);
5862 static int hot_remove_disk(struct mddev * mddev, dev_t dev)
5864 char b[BDEVNAME_SIZE];
5865 struct md_rdev *rdev;
5867 rdev = find_rdev(mddev, dev);
5871 if (rdev->raid_disk >= 0)
5874 kick_rdev_from_array(rdev);
5875 md_update_sb(mddev, 1);
5876 md_new_event(mddev);
5880 printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n",
5881 bdevname(rdev->bdev,b), mdname(mddev));
5885 static int hot_add_disk(struct mddev * mddev, dev_t dev)
5887 char b[BDEVNAME_SIZE];
5889 struct md_rdev *rdev;
5894 if (mddev->major_version != 0) {
5895 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
5896 " version-0 superblocks.\n",
5900 if (!mddev->pers->hot_add_disk) {
5902 "%s: personality does not support diskops!\n",
5907 rdev = md_import_device(dev, -1, 0);
5910 "md: error, md_import_device() returned %ld\n",
5915 if (mddev->persistent)
5916 rdev->sb_start = calc_dev_sboffset(rdev);
5918 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
5920 rdev->sectors = rdev->sb_start;
5922 if (test_bit(Faulty, &rdev->flags)) {
5924 "md: can not hot-add faulty %s disk to %s!\n",
5925 bdevname(rdev->bdev,b), mdname(mddev));
5929 clear_bit(In_sync, &rdev->flags);
5931 rdev->saved_raid_disk = -1;
5932 err = bind_rdev_to_array(rdev, mddev);
5937 * The rest should better be atomic, we can have disk failures
5938 * noticed in interrupt contexts ...
5941 rdev->raid_disk = -1;
5943 md_update_sb(mddev, 1);
5946 * Kick recovery, maybe this spare has to be added to the
5947 * array immediately.
5949 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5950 md_wakeup_thread(mddev->thread);
5951 md_new_event(mddev);
5959 static int set_bitmap_file(struct mddev *mddev, int fd)
5964 if (!mddev->pers->quiesce)
5966 if (mddev->recovery || mddev->sync_thread)
5968 /* we should be able to change the bitmap.. */
5974 return -EEXIST; /* cannot add when bitmap is present */
5975 mddev->bitmap_info.file = fget(fd);
5977 if (mddev->bitmap_info.file == NULL) {
5978 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
5983 err = deny_bitmap_write_access(mddev->bitmap_info.file);
5985 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
5987 fput(mddev->bitmap_info.file);
5988 mddev->bitmap_info.file = NULL;
5991 mddev->bitmap_info.offset = 0; /* file overrides offset */
5992 } else if (mddev->bitmap == NULL)
5993 return -ENOENT; /* cannot remove what isn't there */
5996 mddev->pers->quiesce(mddev, 1);
5998 err = bitmap_create(mddev);
6000 err = bitmap_load(mddev);
6002 if (fd < 0 || err) {
6003 bitmap_destroy(mddev);
6004 fd = -1; /* make sure to put the file */
6006 mddev->pers->quiesce(mddev, 0);
6009 if (mddev->bitmap_info.file) {
6010 restore_bitmap_write_access(mddev->bitmap_info.file);
6011 fput(mddev->bitmap_info.file);
6013 mddev->bitmap_info.file = NULL;
6020 * set_array_info is used two different ways
6021 * The original usage is when creating a new array.
6022 * In this usage, raid_disks is > 0 and it together with
6023 * level, size, not_persistent,layout,chunksize determine the
6024 * shape of the array.
6025 * This will always create an array with a type-0.90.0 superblock.
6026 * The newer usage is when assembling an array.
6027 * In this case raid_disks will be 0, and the major_version field is
6028 * use to determine which style super-blocks are to be found on the devices.
6029 * The minor and patch _version numbers are also kept incase the
6030 * super_block handler wishes to interpret them.
6032 static int set_array_info(struct mddev * mddev, mdu_array_info_t *info)
6035 if (info->raid_disks == 0) {
6036 /* just setting version number for superblock loading */
6037 if (info->major_version < 0 ||
6038 info->major_version >= ARRAY_SIZE(super_types) ||
6039 super_types[info->major_version].name == NULL) {
6040 /* maybe try to auto-load a module? */
6042 "md: superblock version %d not known\n",
6043 info->major_version);
6046 mddev->major_version = info->major_version;
6047 mddev->minor_version = info->minor_version;
6048 mddev->patch_version = info->patch_version;
6049 mddev->persistent = !info->not_persistent;
6050 /* ensure mddev_put doesn't delete this now that there
6051 * is some minimal configuration.
6053 mddev->ctime = get_seconds();
6056 mddev->major_version = MD_MAJOR_VERSION;
6057 mddev->minor_version = MD_MINOR_VERSION;
6058 mddev->patch_version = MD_PATCHLEVEL_VERSION;
6059 mddev->ctime = get_seconds();
6061 mddev->level = info->level;
6062 mddev->clevel[0] = 0;
6063 mddev->dev_sectors = 2 * (sector_t)info->size;
6064 mddev->raid_disks = info->raid_disks;
6065 /* don't set md_minor, it is determined by which /dev/md* was
6068 if (info->state & (1<<MD_SB_CLEAN))
6069 mddev->recovery_cp = MaxSector;
6071 mddev->recovery_cp = 0;
6072 mddev->persistent = ! info->not_persistent;
6073 mddev->external = 0;
6075 mddev->layout = info->layout;
6076 mddev->chunk_sectors = info->chunk_size >> 9;
6078 mddev->max_disks = MD_SB_DISKS;
6080 if (mddev->persistent)
6082 set_bit(MD_CHANGE_DEVS, &mddev->flags);
6084 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
6085 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
6086 mddev->bitmap_info.offset = 0;
6088 mddev->reshape_position = MaxSector;
6091 * Generate a 128 bit UUID
6093 get_random_bytes(mddev->uuid, 16);
6095 mddev->new_level = mddev->level;
6096 mddev->new_chunk_sectors = mddev->chunk_sectors;
6097 mddev->new_layout = mddev->layout;
6098 mddev->delta_disks = 0;
6099 mddev->reshape_backwards = 0;
6104 void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors)
6106 WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__);
6108 if (mddev->external_size)
6111 mddev->array_sectors = array_sectors;
6113 EXPORT_SYMBOL(md_set_array_sectors);
6115 static int update_size(struct mddev *mddev, sector_t num_sectors)
6117 struct md_rdev *rdev;
6119 int fit = (num_sectors == 0);
6121 if (mddev->pers->resize == NULL)
6123 /* The "num_sectors" is the number of sectors of each device that
6124 * is used. This can only make sense for arrays with redundancy.
6125 * linear and raid0 always use whatever space is available. We can only
6126 * consider changing this number if no resync or reconstruction is
6127 * happening, and if the new size is acceptable. It must fit before the
6128 * sb_start or, if that is <data_offset, it must fit before the size
6129 * of each device. If num_sectors is zero, we find the largest size
6132 if (mddev->sync_thread)
6135 rdev_for_each(rdev, mddev) {
6136 sector_t avail = rdev->sectors;
6138 if (fit && (num_sectors == 0 || num_sectors > avail))
6139 num_sectors = avail;
6140 if (avail < num_sectors)
6143 rv = mddev->pers->resize(mddev, num_sectors);
6145 revalidate_disk(mddev->gendisk);
6149 static int update_raid_disks(struct mddev *mddev, int raid_disks)
6152 struct md_rdev *rdev;
6153 /* change the number of raid disks */
6154 if (mddev->pers->check_reshape == NULL)
6156 if (raid_disks <= 0 ||
6157 (mddev->max_disks && raid_disks >= mddev->max_disks))
6159 if (mddev->sync_thread || mddev->reshape_position != MaxSector)
6162 rdev_for_each(rdev, mddev) {
6163 if (mddev->raid_disks < raid_disks &&
6164 rdev->data_offset < rdev->new_data_offset)
6166 if (mddev->raid_disks > raid_disks &&
6167 rdev->data_offset > rdev->new_data_offset)
6171 mddev->delta_disks = raid_disks - mddev->raid_disks;
6172 if (mddev->delta_disks < 0)
6173 mddev->reshape_backwards = 1;
6174 else if (mddev->delta_disks > 0)
6175 mddev->reshape_backwards = 0;
6177 rv = mddev->pers->check_reshape(mddev);
6179 mddev->delta_disks = 0;
6180 mddev->reshape_backwards = 0;
6187 * update_array_info is used to change the configuration of an
6189 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
6190 * fields in the info are checked against the array.
6191 * Any differences that cannot be handled will cause an error.
6192 * Normally, only one change can be managed at a time.
6194 static int update_array_info(struct mddev *mddev, mdu_array_info_t *info)
6200 /* calculate expected state,ignoring low bits */
6201 if (mddev->bitmap && mddev->bitmap_info.offset)
6202 state |= (1 << MD_SB_BITMAP_PRESENT);
6204 if (mddev->major_version != info->major_version ||
6205 mddev->minor_version != info->minor_version ||
6206 /* mddev->patch_version != info->patch_version || */
6207 mddev->ctime != info->ctime ||
6208 mddev->level != info->level ||
6209 /* mddev->layout != info->layout || */
6210 !mddev->persistent != info->not_persistent||
6211 mddev->chunk_sectors != info->chunk_size >> 9 ||
6212 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
6213 ((state^info->state) & 0xfffffe00)
6216 /* Check there is only one change */
6217 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
6219 if (mddev->raid_disks != info->raid_disks)
6221 if (mddev->layout != info->layout)
6223 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT))
6230 if (mddev->layout != info->layout) {
6232 * we don't need to do anything at the md level, the
6233 * personality will take care of it all.
6235 if (mddev->pers->check_reshape == NULL)
6238 mddev->new_layout = info->layout;
6239 rv = mddev->pers->check_reshape(mddev);
6241 mddev->new_layout = mddev->layout;
6245 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
6246 rv = update_size(mddev, (sector_t)info->size * 2);
6248 if (mddev->raid_disks != info->raid_disks)
6249 rv = update_raid_disks(mddev, info->raid_disks);
6251 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
6252 if (mddev->pers->quiesce == NULL)
6254 if (mddev->recovery || mddev->sync_thread)
6256 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
6257 /* add the bitmap */
6260 if (mddev->bitmap_info.default_offset == 0)
6262 mddev->bitmap_info.offset =
6263 mddev->bitmap_info.default_offset;
6264 mddev->bitmap_info.space =
6265 mddev->bitmap_info.default_space;
6266 mddev->pers->quiesce(mddev, 1);
6267 rv = bitmap_create(mddev);
6269 rv = bitmap_load(mddev);
6271 bitmap_destroy(mddev);
6272 mddev->pers->quiesce(mddev, 0);
6274 /* remove the bitmap */
6277 if (mddev->bitmap->storage.file)
6279 mddev->pers->quiesce(mddev, 1);
6280 bitmap_destroy(mddev);
6281 mddev->pers->quiesce(mddev, 0);
6282 mddev->bitmap_info.offset = 0;
6285 md_update_sb(mddev, 1);
6289 static int set_disk_faulty(struct mddev *mddev, dev_t dev)
6291 struct md_rdev *rdev;
6294 if (mddev->pers == NULL)
6298 rdev = find_rdev_rcu(mddev, dev);
6302 md_error(mddev, rdev);
6303 if (!test_bit(Faulty, &rdev->flags))
6311 * We have a problem here : there is no easy way to give a CHS
6312 * virtual geometry. We currently pretend that we have a 2 heads
6313 * 4 sectors (with a BIG number of cylinders...). This drives
6314 * dosfs just mad... ;-)
6316 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
6318 struct mddev *mddev = bdev->bd_disk->private_data;
6322 geo->cylinders = mddev->array_sectors / 8;
6326 static int md_ioctl(struct block_device *bdev, fmode_t mode,
6327 unsigned int cmd, unsigned long arg)
6330 void __user *argp = (void __user *)arg;
6331 struct mddev *mddev = NULL;
6336 case GET_ARRAY_INFO:
6340 if (!capable(CAP_SYS_ADMIN))
6345 * Commands dealing with the RAID driver but not any
6350 err = get_version(argp);
6353 case PRINT_RAID_DEBUG:
6361 autostart_arrays(arg);
6368 * Commands creating/starting a new array:
6371 mddev = bdev->bd_disk->private_data;
6378 /* Some actions do not requires the mutex */
6380 case GET_ARRAY_INFO:
6381 if (!mddev->raid_disks && !mddev->external)
6384 err = get_array_info(mddev, argp);
6388 if (!mddev->raid_disks && !mddev->external)
6391 err = get_disk_info(mddev, argp);
6394 case SET_DISK_FAULTY:
6395 err = set_disk_faulty(mddev, new_decode_dev(arg));
6399 if (cmd == ADD_NEW_DISK)
6400 /* need to ensure md_delayed_delete() has completed */
6401 flush_workqueue(md_misc_wq);
6403 err = mddev_lock(mddev);
6406 "md: ioctl lock interrupted, reason %d, cmd %d\n",
6411 if (cmd == SET_ARRAY_INFO) {
6412 mdu_array_info_t info;
6414 memset(&info, 0, sizeof(info));
6415 else if (copy_from_user(&info, argp, sizeof(info))) {
6420 err = update_array_info(mddev, &info);
6422 printk(KERN_WARNING "md: couldn't update"
6423 " array info. %d\n", err);
6428 if (!list_empty(&mddev->disks)) {
6430 "md: array %s already has disks!\n",
6435 if (mddev->raid_disks) {
6437 "md: array %s already initialised!\n",
6442 err = set_array_info(mddev, &info);
6444 printk(KERN_WARNING "md: couldn't set"
6445 " array info. %d\n", err);
6452 * Commands querying/configuring an existing array:
6454 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
6455 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
6456 if ((!mddev->raid_disks && !mddev->external)
6457 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
6458 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
6459 && cmd != GET_BITMAP_FILE) {
6465 * Commands even a read-only array can execute:
6468 case GET_BITMAP_FILE:
6469 err = get_bitmap_file(mddev, argp);
6472 case RESTART_ARRAY_RW:
6473 err = restart_array(mddev);
6477 err = do_md_stop(mddev, 0, bdev);
6481 err = md_set_readonly(mddev, bdev);
6485 if (get_user(ro, (int __user *)(arg))) {
6491 /* if the bdev is going readonly the value of mddev->ro
6492 * does not matter, no writes are coming
6497 /* are we are already prepared for writes? */
6501 /* transitioning to readauto need only happen for
6502 * arrays that call md_write_start
6505 err = restart_array(mddev);
6508 set_disk_ro(mddev->gendisk, 0);
6515 * The remaining ioctls are changing the state of the
6516 * superblock, so we do not allow them on read-only arrays.
6517 * However non-MD ioctls (e.g. get-size) will still come through
6518 * here and hit the 'default' below, so only disallow
6519 * 'md' ioctls, and switch to rw mode if started auto-readonly.
6521 if (_IOC_TYPE(cmd) == MD_MAJOR && mddev->ro && mddev->pers) {
6522 if (mddev->ro == 2) {
6524 sysfs_notify_dirent_safe(mddev->sysfs_state);
6525 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6526 /* mddev_unlock will wake thread */
6527 /* If a device failed while we were read-only, we
6528 * need to make sure the metadata is updated now.
6530 if (test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
6531 mddev_unlock(mddev);
6532 wait_event(mddev->sb_wait,
6533 !test_bit(MD_CHANGE_DEVS, &mddev->flags) &&
6534 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
6546 mdu_disk_info_t info;
6547 if (copy_from_user(&info, argp, sizeof(info)))
6550 err = add_new_disk(mddev, &info);
6554 case HOT_REMOVE_DISK:
6555 err = hot_remove_disk(mddev, new_decode_dev(arg));
6559 err = hot_add_disk(mddev, new_decode_dev(arg));
6563 err = do_md_run(mddev);
6566 case SET_BITMAP_FILE:
6567 err = set_bitmap_file(mddev, (int)arg);
6577 if (mddev->hold_active == UNTIL_IOCTL &&
6579 mddev->hold_active = 0;
6580 mddev_unlock(mddev);
6589 #ifdef CONFIG_COMPAT
6590 static int md_compat_ioctl(struct block_device *bdev, fmode_t mode,
6591 unsigned int cmd, unsigned long arg)
6594 case HOT_REMOVE_DISK:
6596 case SET_DISK_FAULTY:
6597 case SET_BITMAP_FILE:
6598 /* These take in integer arg, do not convert */
6601 arg = (unsigned long)compat_ptr(arg);
6605 return md_ioctl(bdev, mode, cmd, arg);
6607 #endif /* CONFIG_COMPAT */
6609 static int md_open(struct block_device *bdev, fmode_t mode)
6612 * Succeed if we can lock the mddev, which confirms that
6613 * it isn't being stopped right now.
6615 struct mddev *mddev = mddev_find(bdev->bd_dev);
6621 if (mddev->gendisk != bdev->bd_disk) {
6622 /* we are racing with mddev_put which is discarding this
6626 /* Wait until bdev->bd_disk is definitely gone */
6627 flush_workqueue(md_misc_wq);
6628 /* Then retry the open from the top */
6629 return -ERESTARTSYS;
6631 BUG_ON(mddev != bdev->bd_disk->private_data);
6633 if ((err = mutex_lock_interruptible(&mddev->open_mutex)))
6637 atomic_inc(&mddev->openers);
6638 mutex_unlock(&mddev->open_mutex);
6640 check_disk_change(bdev);
6645 static int md_release(struct gendisk *disk, fmode_t mode)
6647 struct mddev *mddev = disk->private_data;
6650 atomic_dec(&mddev->openers);
6656 static int md_media_changed(struct gendisk *disk)
6658 struct mddev *mddev = disk->private_data;
6660 return mddev->changed;
6663 static int md_revalidate(struct gendisk *disk)
6665 struct mddev *mddev = disk->private_data;
6670 static const struct block_device_operations md_fops =
6672 .owner = THIS_MODULE,
6674 .release = md_release,
6676 #ifdef CONFIG_COMPAT
6677 .compat_ioctl = md_compat_ioctl,
6679 .getgeo = md_getgeo,
6680 .media_changed = md_media_changed,
6681 .revalidate_disk= md_revalidate,
6684 static int md_thread(void * arg)
6686 struct md_thread *thread = arg;
6689 * md_thread is a 'system-thread', it's priority should be very
6690 * high. We avoid resource deadlocks individually in each
6691 * raid personality. (RAID5 does preallocation) We also use RR and
6692 * the very same RT priority as kswapd, thus we will never get
6693 * into a priority inversion deadlock.
6695 * we definitely have to have equal or higher priority than
6696 * bdflush, otherwise bdflush will deadlock if there are too
6697 * many dirty RAID5 blocks.
6700 allow_signal(SIGKILL);
6701 while (!kthread_should_stop()) {
6703 /* We need to wait INTERRUPTIBLE so that
6704 * we don't add to the load-average.
6705 * That means we need to be sure no signals are
6708 if (signal_pending(current))
6709 flush_signals(current);
6711 wait_event_interruptible_timeout
6713 test_bit(THREAD_WAKEUP, &thread->flags)
6714 || kthread_should_stop(),
6717 clear_bit(THREAD_WAKEUP, &thread->flags);
6718 if (!kthread_should_stop())
6719 thread->run(thread);
6725 void md_wakeup_thread(struct md_thread *thread)
6728 pr_debug("md: waking up MD thread %s.\n", thread->tsk->comm);
6729 set_bit(THREAD_WAKEUP, &thread->flags);
6730 wake_up(&thread->wqueue);
6734 struct md_thread *md_register_thread(void (*run) (struct md_thread *),
6735 struct mddev *mddev, const char *name)
6737 struct md_thread *thread;
6739 thread = kzalloc(sizeof(struct md_thread), GFP_KERNEL);
6743 init_waitqueue_head(&thread->wqueue);
6746 thread->mddev = mddev;
6747 thread->timeout = MAX_SCHEDULE_TIMEOUT;
6748 thread->tsk = kthread_run(md_thread, thread,
6750 mdname(thread->mddev),
6752 if (IS_ERR(thread->tsk)) {
6759 void md_unregister_thread(struct md_thread **threadp)
6761 struct md_thread *thread = *threadp;
6764 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
6765 /* Locking ensures that mddev_unlock does not wake_up a
6766 * non-existent thread
6768 spin_lock(&pers_lock);
6770 spin_unlock(&pers_lock);
6772 kthread_stop(thread->tsk);
6776 void md_error(struct mddev *mddev, struct md_rdev *rdev)
6783 if (!rdev || test_bit(Faulty, &rdev->flags))
6786 if (!mddev->pers || !mddev->pers->error_handler)
6788 mddev->pers->error_handler(mddev,rdev);
6789 if (mddev->degraded)
6790 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6791 sysfs_notify_dirent_safe(rdev->sysfs_state);
6792 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6793 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6794 md_wakeup_thread(mddev->thread);
6795 if (mddev->event_work.func)
6796 queue_work(md_misc_wq, &mddev->event_work);
6797 md_new_event_inintr(mddev);
6800 /* seq_file implementation /proc/mdstat */
6802 static void status_unused(struct seq_file *seq)
6805 struct md_rdev *rdev;
6807 seq_printf(seq, "unused devices: ");
6809 list_for_each_entry(rdev, &pending_raid_disks, same_set) {
6810 char b[BDEVNAME_SIZE];
6812 seq_printf(seq, "%s ",
6813 bdevname(rdev->bdev,b));
6816 seq_printf(seq, "<none>");
6818 seq_printf(seq, "\n");
6822 static void status_resync(struct seq_file *seq, struct mddev * mddev)
6824 sector_t max_sectors, resync, res;
6825 unsigned long dt, db;
6828 unsigned int per_milli;
6830 if (mddev->curr_resync <= 3)
6833 resync = mddev->curr_resync
6834 - atomic_read(&mddev->recovery_active);
6836 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
6837 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
6838 max_sectors = mddev->resync_max_sectors;
6840 max_sectors = mddev->dev_sectors;
6843 * Should not happen.
6849 /* Pick 'scale' such that (resync>>scale)*1000 will fit
6850 * in a sector_t, and (max_sectors>>scale) will fit in a
6851 * u32, as those are the requirements for sector_div.
6852 * Thus 'scale' must be at least 10
6855 if (sizeof(sector_t) > sizeof(unsigned long)) {
6856 while ( max_sectors/2 > (1ULL<<(scale+32)))
6859 res = (resync>>scale)*1000;
6860 sector_div(res, (u32)((max_sectors>>scale)+1));
6864 int i, x = per_milli/50, y = 20-x;
6865 seq_printf(seq, "[");
6866 for (i = 0; i < x; i++)
6867 seq_printf(seq, "=");
6868 seq_printf(seq, ">");
6869 for (i = 0; i < y; i++)
6870 seq_printf(seq, ".");
6871 seq_printf(seq, "] ");
6873 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
6874 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
6876 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
6878 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
6879 "resync" : "recovery"))),
6880 per_milli/10, per_milli % 10,
6881 (unsigned long long) resync/2,
6882 (unsigned long long) max_sectors/2);
6885 * dt: time from mark until now
6886 * db: blocks written from mark until now
6887 * rt: remaining time
6889 * rt is a sector_t, so could be 32bit or 64bit.
6890 * So we divide before multiply in case it is 32bit and close
6892 * We scale the divisor (db) by 32 to avoid losing precision
6893 * near the end of resync when the number of remaining sectors
6895 * We then divide rt by 32 after multiplying by db to compensate.
6896 * The '+1' avoids division by zero if db is very small.
6898 dt = ((jiffies - mddev->resync_mark) / HZ);
6900 db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active))
6901 - mddev->resync_mark_cnt;
6903 rt = max_sectors - resync; /* number of remaining sectors */
6904 sector_div(rt, db/32+1);
6908 seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60,
6909 ((unsigned long)rt % 60)/6);
6911 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
6914 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
6916 struct list_head *tmp;
6918 struct mddev *mddev;
6926 spin_lock(&all_mddevs_lock);
6927 list_for_each(tmp,&all_mddevs)
6929 mddev = list_entry(tmp, struct mddev, all_mddevs);
6931 spin_unlock(&all_mddevs_lock);
6934 spin_unlock(&all_mddevs_lock);
6936 return (void*)2;/* tail */
6940 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
6942 struct list_head *tmp;
6943 struct mddev *next_mddev, *mddev = v;
6949 spin_lock(&all_mddevs_lock);
6951 tmp = all_mddevs.next;
6953 tmp = mddev->all_mddevs.next;
6954 if (tmp != &all_mddevs)
6955 next_mddev = mddev_get(list_entry(tmp,struct mddev,all_mddevs));
6957 next_mddev = (void*)2;
6960 spin_unlock(&all_mddevs_lock);
6968 static void md_seq_stop(struct seq_file *seq, void *v)
6970 struct mddev *mddev = v;
6972 if (mddev && v != (void*)1 && v != (void*)2)
6976 static int md_seq_show(struct seq_file *seq, void *v)
6978 struct mddev *mddev = v;
6980 struct md_rdev *rdev;
6982 if (v == (void*)1) {
6983 struct md_personality *pers;
6984 seq_printf(seq, "Personalities : ");
6985 spin_lock(&pers_lock);
6986 list_for_each_entry(pers, &pers_list, list)
6987 seq_printf(seq, "[%s] ", pers->name);
6989 spin_unlock(&pers_lock);
6990 seq_printf(seq, "\n");
6991 seq->poll_event = atomic_read(&md_event_count);
6994 if (v == (void*)2) {
6999 if (mddev_lock(mddev) < 0)
7002 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
7003 seq_printf(seq, "%s : %sactive", mdname(mddev),
7004 mddev->pers ? "" : "in");
7007 seq_printf(seq, " (read-only)");
7009 seq_printf(seq, " (auto-read-only)");
7010 seq_printf(seq, " %s", mddev->pers->name);
7014 rdev_for_each(rdev, mddev) {
7015 char b[BDEVNAME_SIZE];
7016 seq_printf(seq, " %s[%d]",
7017 bdevname(rdev->bdev,b), rdev->desc_nr);
7018 if (test_bit(WriteMostly, &rdev->flags))
7019 seq_printf(seq, "(W)");
7020 if (test_bit(Faulty, &rdev->flags)) {
7021 seq_printf(seq, "(F)");
7024 if (rdev->raid_disk < 0)
7025 seq_printf(seq, "(S)"); /* spare */
7026 if (test_bit(Replacement, &rdev->flags))
7027 seq_printf(seq, "(R)");
7028 sectors += rdev->sectors;
7031 if (!list_empty(&mddev->disks)) {
7033 seq_printf(seq, "\n %llu blocks",
7034 (unsigned long long)
7035 mddev->array_sectors / 2);
7037 seq_printf(seq, "\n %llu blocks",
7038 (unsigned long long)sectors / 2);
7040 if (mddev->persistent) {
7041 if (mddev->major_version != 0 ||
7042 mddev->minor_version != 90) {
7043 seq_printf(seq," super %d.%d",
7044 mddev->major_version,
7045 mddev->minor_version);
7047 } else if (mddev->external)
7048 seq_printf(seq, " super external:%s",
7049 mddev->metadata_type);
7051 seq_printf(seq, " super non-persistent");
7054 mddev->pers->status(seq, mddev);
7055 seq_printf(seq, "\n ");
7056 if (mddev->pers->sync_request) {
7057 if (mddev->curr_resync > 2) {
7058 status_resync(seq, mddev);
7059 seq_printf(seq, "\n ");
7060 } else if (mddev->curr_resync >= 1)
7061 seq_printf(seq, "\tresync=DELAYED\n ");
7062 else if (mddev->recovery_cp < MaxSector)
7063 seq_printf(seq, "\tresync=PENDING\n ");
7066 seq_printf(seq, "\n ");
7068 bitmap_status(seq, mddev->bitmap);
7070 seq_printf(seq, "\n");
7072 mddev_unlock(mddev);
7077 static const struct seq_operations md_seq_ops = {
7078 .start = md_seq_start,
7079 .next = md_seq_next,
7080 .stop = md_seq_stop,
7081 .show = md_seq_show,
7084 static int md_seq_open(struct inode *inode, struct file *file)
7086 struct seq_file *seq;
7089 error = seq_open(file, &md_seq_ops);
7093 seq = file->private_data;
7094 seq->poll_event = atomic_read(&md_event_count);
7098 static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
7100 struct seq_file *seq = filp->private_data;
7103 poll_wait(filp, &md_event_waiters, wait);
7105 /* always allow read */
7106 mask = POLLIN | POLLRDNORM;
7108 if (seq->poll_event != atomic_read(&md_event_count))
7109 mask |= POLLERR | POLLPRI;
7113 static const struct file_operations md_seq_fops = {
7114 .owner = THIS_MODULE,
7115 .open = md_seq_open,
7117 .llseek = seq_lseek,
7118 .release = seq_release_private,
7119 .poll = mdstat_poll,
7122 int register_md_personality(struct md_personality *p)
7124 spin_lock(&pers_lock);
7125 list_add_tail(&p->list, &pers_list);
7126 printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level);
7127 spin_unlock(&pers_lock);
7131 int unregister_md_personality(struct md_personality *p)
7133 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
7134 spin_lock(&pers_lock);
7135 list_del_init(&p->list);
7136 spin_unlock(&pers_lock);
7140 static int is_mddev_idle(struct mddev *mddev, int init)
7142 struct md_rdev * rdev;
7148 rdev_for_each_rcu(rdev, mddev) {
7149 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
7150 curr_events = (int)part_stat_read(&disk->part0, sectors[0]) +
7151 (int)part_stat_read(&disk->part0, sectors[1]) -
7152 atomic_read(&disk->sync_io);
7153 /* sync IO will cause sync_io to increase before the disk_stats
7154 * as sync_io is counted when a request starts, and
7155 * disk_stats is counted when it completes.
7156 * So resync activity will cause curr_events to be smaller than
7157 * when there was no such activity.
7158 * non-sync IO will cause disk_stat to increase without
7159 * increasing sync_io so curr_events will (eventually)
7160 * be larger than it was before. Once it becomes
7161 * substantially larger, the test below will cause
7162 * the array to appear non-idle, and resync will slow
7164 * If there is a lot of outstanding resync activity when
7165 * we set last_event to curr_events, then all that activity
7166 * completing might cause the array to appear non-idle
7167 * and resync will be slowed down even though there might
7168 * not have been non-resync activity. This will only
7169 * happen once though. 'last_events' will soon reflect
7170 * the state where there is little or no outstanding
7171 * resync requests, and further resync activity will
7172 * always make curr_events less than last_events.
7175 if (init || curr_events - rdev->last_events > 64) {
7176 rdev->last_events = curr_events;
7184 void md_done_sync(struct mddev *mddev, int blocks, int ok)
7186 /* another "blocks" (512byte) blocks have been synced */
7187 atomic_sub(blocks, &mddev->recovery_active);
7188 wake_up(&mddev->recovery_wait);
7190 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7191 set_bit(MD_RECOVERY_ERROR, &mddev->recovery);
7192 md_wakeup_thread(mddev->thread);
7193 // stop recovery, signal do_sync ....
7198 /* md_write_start(mddev, bi)
7199 * If we need to update some array metadata (e.g. 'active' flag
7200 * in superblock) before writing, schedule a superblock update
7201 * and wait for it to complete.
7203 void md_write_start(struct mddev *mddev, struct bio *bi)
7206 if (bio_data_dir(bi) != WRITE)
7209 BUG_ON(mddev->ro == 1);
7210 if (mddev->ro == 2) {
7211 /* need to switch to read/write */
7213 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7214 md_wakeup_thread(mddev->thread);
7215 md_wakeup_thread(mddev->sync_thread);
7218 atomic_inc(&mddev->writes_pending);
7219 if (mddev->safemode == 1)
7220 mddev->safemode = 0;
7221 if (mddev->in_sync) {
7222 spin_lock_irq(&mddev->write_lock);
7223 if (mddev->in_sync) {
7225 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
7226 set_bit(MD_CHANGE_PENDING, &mddev->flags);
7227 md_wakeup_thread(mddev->thread);
7230 spin_unlock_irq(&mddev->write_lock);
7233 sysfs_notify_dirent_safe(mddev->sysfs_state);
7234 wait_event(mddev->sb_wait,
7235 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
7238 void md_write_end(struct mddev *mddev)
7240 if (atomic_dec_and_test(&mddev->writes_pending)) {
7241 if (mddev->safemode == 2)
7242 md_wakeup_thread(mddev->thread);
7243 else if (mddev->safemode_delay)
7244 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
7248 /* md_allow_write(mddev)
7249 * Calling this ensures that the array is marked 'active' so that writes
7250 * may proceed without blocking. It is important to call this before
7251 * attempting a GFP_KERNEL allocation while holding the mddev lock.
7252 * Must be called with mddev_lock held.
7254 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
7255 * is dropped, so return -EAGAIN after notifying userspace.
7257 int md_allow_write(struct mddev *mddev)
7263 if (!mddev->pers->sync_request)
7266 spin_lock_irq(&mddev->write_lock);
7267 if (mddev->in_sync) {
7269 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
7270 set_bit(MD_CHANGE_PENDING, &mddev->flags);
7271 if (mddev->safemode_delay &&
7272 mddev->safemode == 0)
7273 mddev->safemode = 1;
7274 spin_unlock_irq(&mddev->write_lock);
7275 md_update_sb(mddev, 0);
7276 sysfs_notify_dirent_safe(mddev->sysfs_state);
7278 spin_unlock_irq(&mddev->write_lock);
7280 if (test_bit(MD_CHANGE_PENDING, &mddev->flags))
7285 EXPORT_SYMBOL_GPL(md_allow_write);
7287 #define SYNC_MARKS 10
7288 #define SYNC_MARK_STEP (3*HZ)
7289 #define UPDATE_FREQUENCY (5*60*HZ)
7290 void md_do_sync(struct md_thread *thread)
7292 struct mddev *mddev = thread->mddev;
7293 struct mddev *mddev2;
7294 unsigned int currspeed = 0,
7296 sector_t max_sectors,j, io_sectors;
7297 unsigned long mark[SYNC_MARKS];
7298 unsigned long update_time;
7299 sector_t mark_cnt[SYNC_MARKS];
7301 struct list_head *tmp;
7302 sector_t last_check;
7304 struct md_rdev *rdev;
7306 struct blk_plug plug;
7308 /* just incase thread restarts... */
7309 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
7311 if (mddev->ro) /* never try to sync a read-only array */
7314 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
7315 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
7316 desc = "data-check";
7317 else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
7318 desc = "requested-resync";
7321 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
7326 /* we overload curr_resync somewhat here.
7327 * 0 == not engaged in resync at all
7328 * 2 == checking that there is no conflict with another sync
7329 * 1 == like 2, but have yielded to allow conflicting resync to
7331 * other == active in resync - this many blocks
7333 * Before starting a resync we must have set curr_resync to
7334 * 2, and then checked that every "conflicting" array has curr_resync
7335 * less than ours. When we find one that is the same or higher
7336 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
7337 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
7338 * This will mean we have to start checking from the beginning again.
7343 mddev->curr_resync = 2;
7346 if (kthread_should_stop())
7347 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7349 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
7351 for_each_mddev(mddev2, tmp) {
7352 if (mddev2 == mddev)
7354 if (!mddev->parallel_resync
7355 && mddev2->curr_resync
7356 && match_mddev_units(mddev, mddev2)) {
7358 if (mddev < mddev2 && mddev->curr_resync == 2) {
7359 /* arbitrarily yield */
7360 mddev->curr_resync = 1;
7361 wake_up(&resync_wait);
7363 if (mddev > mddev2 && mddev->curr_resync == 1)
7364 /* no need to wait here, we can wait the next
7365 * time 'round when curr_resync == 2
7368 /* We need to wait 'interruptible' so as not to
7369 * contribute to the load average, and not to
7370 * be caught by 'softlockup'
7372 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
7373 if (!kthread_should_stop() &&
7374 mddev2->curr_resync >= mddev->curr_resync) {
7375 printk(KERN_INFO "md: delaying %s of %s"
7376 " until %s has finished (they"
7377 " share one or more physical units)\n",
7378 desc, mdname(mddev), mdname(mddev2));
7380 if (signal_pending(current))
7381 flush_signals(current);
7383 finish_wait(&resync_wait, &wq);
7386 finish_wait(&resync_wait, &wq);
7389 } while (mddev->curr_resync < 2);
7392 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
7393 /* resync follows the size requested by the personality,
7394 * which defaults to physical size, but can be virtual size
7396 max_sectors = mddev->resync_max_sectors;
7397 atomic64_set(&mddev->resync_mismatches, 0);
7398 /* we don't use the checkpoint if there's a bitmap */
7399 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
7400 j = mddev->resync_min;
7401 else if (!mddev->bitmap)
7402 j = mddev->recovery_cp;
7404 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
7405 max_sectors = mddev->resync_max_sectors;
7407 /* recovery follows the physical size of devices */
7408 max_sectors = mddev->dev_sectors;
7411 rdev_for_each_rcu(rdev, mddev)
7412 if (rdev->raid_disk >= 0 &&
7413 !test_bit(Faulty, &rdev->flags) &&
7414 !test_bit(In_sync, &rdev->flags) &&
7415 rdev->recovery_offset < j)
7416 j = rdev->recovery_offset;
7420 printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev));
7421 printk(KERN_INFO "md: minimum _guaranteed_ speed:"
7422 " %d KB/sec/disk.\n", speed_min(mddev));
7423 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
7424 "(but not more than %d KB/sec) for %s.\n",
7425 speed_max(mddev), desc);
7427 is_mddev_idle(mddev, 1); /* this initializes IO event counters */
7430 for (m = 0; m < SYNC_MARKS; m++) {
7432 mark_cnt[m] = io_sectors;
7435 mddev->resync_mark = mark[last_mark];
7436 mddev->resync_mark_cnt = mark_cnt[last_mark];
7439 * Tune reconstruction:
7441 window = 32*(PAGE_SIZE/512);
7442 printk(KERN_INFO "md: using %dk window, over a total of %lluk.\n",
7443 window/2, (unsigned long long)max_sectors/2);
7445 atomic_set(&mddev->recovery_active, 0);
7450 "md: resuming %s of %s from checkpoint.\n",
7451 desc, mdname(mddev));
7452 mddev->curr_resync = j;
7454 mddev->curr_resync = 3; /* no longer delayed */
7455 mddev->curr_resync_completed = j;
7456 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
7457 md_new_event(mddev);
7458 update_time = jiffies;
7460 blk_start_plug(&plug);
7461 while (j < max_sectors) {
7466 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
7467 ((mddev->curr_resync > mddev->curr_resync_completed &&
7468 (mddev->curr_resync - mddev->curr_resync_completed)
7469 > (max_sectors >> 4)) ||
7470 time_after_eq(jiffies, update_time + UPDATE_FREQUENCY) ||
7471 (j - mddev->curr_resync_completed)*2
7472 >= mddev->resync_max - mddev->curr_resync_completed
7474 /* time to update curr_resync_completed */
7475 wait_event(mddev->recovery_wait,
7476 atomic_read(&mddev->recovery_active) == 0);
7477 mddev->curr_resync_completed = j;
7478 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) &&
7479 j > mddev->recovery_cp)
7480 mddev->recovery_cp = j;
7481 update_time = jiffies;
7482 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
7483 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
7486 while (j >= mddev->resync_max && !kthread_should_stop()) {
7487 /* As this condition is controlled by user-space,
7488 * we can block indefinitely, so use '_interruptible'
7489 * to avoid triggering warnings.
7491 flush_signals(current); /* just in case */
7492 wait_event_interruptible(mddev->recovery_wait,
7493 mddev->resync_max > j
7494 || kthread_should_stop());
7497 if (kthread_should_stop())
7500 sectors = mddev->pers->sync_request(mddev, j, &skipped,
7501 currspeed < speed_min(mddev));
7503 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7507 if (!skipped) { /* actual IO requested */
7508 io_sectors += sectors;
7509 atomic_add(sectors, &mddev->recovery_active);
7512 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
7517 mddev->curr_resync = j;
7518 mddev->curr_mark_cnt = io_sectors;
7519 if (last_check == 0)
7520 /* this is the earliest that rebuild will be
7521 * visible in /proc/mdstat
7523 md_new_event(mddev);
7525 if (last_check + window > io_sectors || j == max_sectors)
7528 last_check = io_sectors;
7530 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
7532 int next = (last_mark+1) % SYNC_MARKS;
7534 mddev->resync_mark = mark[next];
7535 mddev->resync_mark_cnt = mark_cnt[next];
7536 mark[next] = jiffies;
7537 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
7542 if (kthread_should_stop())
7547 * this loop exits only if either when we are slower than
7548 * the 'hard' speed limit, or the system was IO-idle for
7550 * the system might be non-idle CPU-wise, but we only care
7551 * about not overloading the IO subsystem. (things like an
7552 * e2fsck being done on the RAID array should execute fast)
7556 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
7557 /((jiffies-mddev->resync_mark)/HZ +1) +1;
7559 if (currspeed > speed_min(mddev)) {
7560 if ((currspeed > speed_max(mddev)) ||
7561 !is_mddev_idle(mddev, 0)) {
7567 printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc);
7569 * this also signals 'finished resyncing' to md_stop
7572 blk_finish_plug(&plug);
7573 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
7575 /* tell personality that we are finished */
7576 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
7578 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
7579 mddev->curr_resync > 2) {
7580 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
7581 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
7582 if (mddev->curr_resync >= mddev->recovery_cp) {
7584 "md: checkpointing %s of %s.\n",
7585 desc, mdname(mddev));
7586 if (test_bit(MD_RECOVERY_ERROR,
7588 mddev->recovery_cp =
7589 mddev->curr_resync_completed;
7591 mddev->recovery_cp =
7595 mddev->recovery_cp = MaxSector;
7597 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
7598 mddev->curr_resync = MaxSector;
7600 rdev_for_each_rcu(rdev, mddev)
7601 if (rdev->raid_disk >= 0 &&
7602 mddev->delta_disks >= 0 &&
7603 !test_bit(Faulty, &rdev->flags) &&
7604 !test_bit(In_sync, &rdev->flags) &&
7605 rdev->recovery_offset < mddev->curr_resync)
7606 rdev->recovery_offset = mddev->curr_resync;
7611 set_bit(MD_CHANGE_DEVS, &mddev->flags);
7613 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
7614 /* We completed so min/max setting can be forgotten if used. */
7615 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
7616 mddev->resync_min = 0;
7617 mddev->resync_max = MaxSector;
7618 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
7619 mddev->resync_min = mddev->curr_resync_completed;
7620 mddev->curr_resync = 0;
7621 wake_up(&resync_wait);
7622 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
7623 md_wakeup_thread(mddev->thread);
7628 * got a signal, exit.
7631 "md: md_do_sync() got signal ... exiting\n");
7632 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7636 EXPORT_SYMBOL_GPL(md_do_sync);
7638 static int remove_and_add_spares(struct mddev *mddev)
7640 struct md_rdev *rdev;
7644 rdev_for_each(rdev, mddev)
7645 if (rdev->raid_disk >= 0 &&
7646 !test_bit(Blocked, &rdev->flags) &&
7647 (test_bit(Faulty, &rdev->flags) ||
7648 ! test_bit(In_sync, &rdev->flags)) &&
7649 atomic_read(&rdev->nr_pending)==0) {
7650 if (mddev->pers->hot_remove_disk(
7651 mddev, rdev) == 0) {
7652 sysfs_unlink_rdev(mddev, rdev);
7653 rdev->raid_disk = -1;
7657 if (removed && mddev->kobj.sd)
7658 sysfs_notify(&mddev->kobj, NULL, "degraded");
7660 rdev_for_each(rdev, mddev) {
7661 if (rdev->raid_disk >= 0 &&
7662 !test_bit(In_sync, &rdev->flags) &&
7663 !test_bit(Faulty, &rdev->flags))
7665 if (rdev->raid_disk < 0
7666 && !test_bit(Faulty, &rdev->flags)) {
7667 rdev->recovery_offset = 0;
7669 hot_add_disk(mddev, rdev) == 0) {
7670 if (sysfs_link_rdev(mddev, rdev))
7671 /* failure here is OK */;
7673 md_new_event(mddev);
7674 set_bit(MD_CHANGE_DEVS, &mddev->flags);
7679 set_bit(MD_CHANGE_DEVS, &mddev->flags);
7683 static void reap_sync_thread(struct mddev *mddev)
7685 struct md_rdev *rdev;
7687 /* resync has finished, collect result */
7688 md_unregister_thread(&mddev->sync_thread);
7689 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
7690 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
7692 /* activate any spares */
7693 if (mddev->pers->spare_active(mddev)) {
7694 sysfs_notify(&mddev->kobj, NULL,
7696 set_bit(MD_CHANGE_DEVS, &mddev->flags);
7699 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
7700 mddev->pers->finish_reshape)
7701 mddev->pers->finish_reshape(mddev);
7703 /* If array is no-longer degraded, then any saved_raid_disk
7704 * information must be scrapped. Also if any device is now
7705 * In_sync we must scrape the saved_raid_disk for that device
7706 * do the superblock for an incrementally recovered device
7709 rdev_for_each(rdev, mddev)
7710 if (!mddev->degraded ||
7711 test_bit(In_sync, &rdev->flags))
7712 rdev->saved_raid_disk = -1;
7714 md_update_sb(mddev, 1);
7715 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7716 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7717 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
7718 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
7719 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
7720 /* flag recovery needed just to double check */
7721 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7722 sysfs_notify_dirent_safe(mddev->sysfs_action);
7723 md_new_event(mddev);
7724 if (mddev->event_work.func)
7725 queue_work(md_misc_wq, &mddev->event_work);
7729 * This routine is regularly called by all per-raid-array threads to
7730 * deal with generic issues like resync and super-block update.
7731 * Raid personalities that don't have a thread (linear/raid0) do not
7732 * need this as they never do any recovery or update the superblock.
7734 * It does not do any resync itself, but rather "forks" off other threads
7735 * to do that as needed.
7736 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
7737 * "->recovery" and create a thread at ->sync_thread.
7738 * When the thread finishes it sets MD_RECOVERY_DONE
7739 * and wakeups up this thread which will reap the thread and finish up.
7740 * This thread also removes any faulty devices (with nr_pending == 0).
7742 * The overall approach is:
7743 * 1/ if the superblock needs updating, update it.
7744 * 2/ If a recovery thread is running, don't do anything else.
7745 * 3/ If recovery has finished, clean up, possibly marking spares active.
7746 * 4/ If there are any faulty devices, remove them.
7747 * 5/ If array is degraded, try to add spares devices
7748 * 6/ If array has spares or is not in-sync, start a resync thread.
7750 void md_check_recovery(struct mddev *mddev)
7752 if (mddev->suspended)
7756 bitmap_daemon_work(mddev);
7758 if (signal_pending(current)) {
7759 if (mddev->pers->sync_request && !mddev->external) {
7760 printk(KERN_INFO "md: %s in immediate safe mode\n",
7762 mddev->safemode = 2;
7764 flush_signals(current);
7767 if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
7770 (mddev->flags & ~ (1<<MD_CHANGE_PENDING)) ||
7771 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
7772 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
7773 (mddev->external == 0 && mddev->safemode == 1) ||
7774 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
7775 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
7779 if (mddev_trylock(mddev)) {
7783 /* Only thing we do on a ro array is remove
7786 struct md_rdev *rdev;
7787 rdev_for_each(rdev, mddev)
7788 if (rdev->raid_disk >= 0 &&
7789 !test_bit(Blocked, &rdev->flags) &&
7790 test_bit(Faulty, &rdev->flags) &&
7791 atomic_read(&rdev->nr_pending)==0) {
7792 if (mddev->pers->hot_remove_disk(
7793 mddev, rdev) == 0) {
7794 sysfs_unlink_rdev(mddev, rdev);
7795 rdev->raid_disk = -1;
7798 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7802 if (!mddev->external) {
7804 spin_lock_irq(&mddev->write_lock);
7805 if (mddev->safemode &&
7806 !atomic_read(&mddev->writes_pending) &&
7808 mddev->recovery_cp == MaxSector) {
7811 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
7813 if (mddev->safemode == 1)
7814 mddev->safemode = 0;
7815 spin_unlock_irq(&mddev->write_lock);
7817 sysfs_notify_dirent_safe(mddev->sysfs_state);
7821 md_update_sb(mddev, 0);
7823 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
7824 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
7825 /* resync/recovery still happening */
7826 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7829 if (mddev->sync_thread) {
7830 reap_sync_thread(mddev);
7833 /* Set RUNNING before clearing NEEDED to avoid
7834 * any transients in the value of "sync_action".
7836 mddev->curr_resync_completed = 0;
7837 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7838 /* Clear some bits that don't mean anything, but
7841 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
7842 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
7844 if (!test_and_clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
7845 test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
7847 /* no recovery is running.
7848 * remove any failed drives, then
7849 * add spares if possible.
7850 * Spares are also removed and re-added, to allow
7851 * the personality to fail the re-add.
7854 if (mddev->reshape_position != MaxSector) {
7855 if (mddev->pers->check_reshape == NULL ||
7856 mddev->pers->check_reshape(mddev) != 0)
7857 /* Cannot proceed */
7859 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
7860 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7861 } else if ((spares = remove_and_add_spares(mddev))) {
7862 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7863 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
7864 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
7865 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7866 } else if (mddev->recovery_cp < MaxSector) {
7867 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7868 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7869 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
7870 /* nothing to be done ... */
7873 if (mddev->pers->sync_request) {
7875 /* We are adding a device or devices to an array
7876 * which has the bitmap stored on all devices.
7877 * So make sure all bitmap pages get written
7879 bitmap_write_all(mddev->bitmap);
7881 mddev->sync_thread = md_register_thread(md_do_sync,
7884 if (!mddev->sync_thread) {
7885 printk(KERN_ERR "%s: could not start resync"
7888 /* leave the spares where they are, it shouldn't hurt */
7889 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7890 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7891 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
7892 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
7893 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
7895 md_wakeup_thread(mddev->sync_thread);
7896 sysfs_notify_dirent_safe(mddev->sysfs_action);
7897 md_new_event(mddev);
7900 if (!mddev->sync_thread) {
7901 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7902 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
7904 if (mddev->sysfs_action)
7905 sysfs_notify_dirent_safe(mddev->sysfs_action);
7907 mddev_unlock(mddev);
7911 void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev)
7913 sysfs_notify_dirent_safe(rdev->sysfs_state);
7914 wait_event_timeout(rdev->blocked_wait,
7915 !test_bit(Blocked, &rdev->flags) &&
7916 !test_bit(BlockedBadBlocks, &rdev->flags),
7917 msecs_to_jiffies(5000));
7918 rdev_dec_pending(rdev, mddev);
7920 EXPORT_SYMBOL(md_wait_for_blocked_rdev);
7922 void md_finish_reshape(struct mddev *mddev)
7924 /* called be personality module when reshape completes. */
7925 struct md_rdev *rdev;
7927 rdev_for_each(rdev, mddev) {
7928 if (rdev->data_offset > rdev->new_data_offset)
7929 rdev->sectors += rdev->data_offset - rdev->new_data_offset;
7931 rdev->sectors -= rdev->new_data_offset - rdev->data_offset;
7932 rdev->data_offset = rdev->new_data_offset;
7935 EXPORT_SYMBOL(md_finish_reshape);
7937 /* Bad block management.
7938 * We can record which blocks on each device are 'bad' and so just
7939 * fail those blocks, or that stripe, rather than the whole device.
7940 * Entries in the bad-block table are 64bits wide. This comprises:
7941 * Length of bad-range, in sectors: 0-511 for lengths 1-512
7942 * Start of bad-range, sector offset, 54 bits (allows 8 exbibytes)
7943 * A 'shift' can be set so that larger blocks are tracked and
7944 * consequently larger devices can be covered.
7945 * 'Acknowledged' flag - 1 bit. - the most significant bit.
7947 * Locking of the bad-block table uses a seqlock so md_is_badblock
7948 * might need to retry if it is very unlucky.
7949 * We will sometimes want to check for bad blocks in a bi_end_io function,
7950 * so we use the write_seqlock_irq variant.
7952 * When looking for a bad block we specify a range and want to
7953 * know if any block in the range is bad. So we binary-search
7954 * to the last range that starts at-or-before the given endpoint,
7955 * (or "before the sector after the target range")
7956 * then see if it ends after the given start.
7958 * 0 if there are no known bad blocks in the range
7959 * 1 if there are known bad block which are all acknowledged
7960 * -1 if there are bad blocks which have not yet been acknowledged in metadata.
7961 * plus the start/length of the first bad section we overlap.
7963 int md_is_badblock(struct badblocks *bb, sector_t s, int sectors,
7964 sector_t *first_bad, int *bad_sectors)
7970 sector_t target = s + sectors;
7973 if (bb->shift > 0) {
7974 /* round the start down, and the end up */
7976 target += (1<<bb->shift) - 1;
7977 target >>= bb->shift;
7978 sectors = target - s;
7980 /* 'target' is now the first block after the bad range */
7983 seq = read_seqbegin(&bb->lock);
7988 /* Binary search between lo and hi for 'target'
7989 * i.e. for the last range that starts before 'target'
7991 /* INVARIANT: ranges before 'lo' and at-or-after 'hi'
7992 * are known not to be the last range before target.
7993 * VARIANT: hi-lo is the number of possible
7994 * ranges, and decreases until it reaches 1
7996 while (hi - lo > 1) {
7997 int mid = (lo + hi) / 2;
7998 sector_t a = BB_OFFSET(p[mid]);
8000 /* This could still be the one, earlier ranges
8004 /* This and later ranges are definitely out. */
8007 /* 'lo' might be the last that started before target, but 'hi' isn't */
8009 /* need to check all range that end after 's' to see if
8010 * any are unacknowledged.
8013 BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) {
8014 if (BB_OFFSET(p[lo]) < target) {
8015 /* starts before the end, and finishes after
8016 * the start, so they must overlap
8018 if (rv != -1 && BB_ACK(p[lo]))
8022 *first_bad = BB_OFFSET(p[lo]);
8023 *bad_sectors = BB_LEN(p[lo]);
8029 if (read_seqretry(&bb->lock, seq))
8034 EXPORT_SYMBOL_GPL(md_is_badblock);
8037 * Add a range of bad blocks to the table.
8038 * This might extend the table, or might contract it
8039 * if two adjacent ranges can be merged.
8040 * We binary-search to find the 'insertion' point, then
8041 * decide how best to handle it.
8043 static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors,
8051 /* badblocks are disabled */
8055 /* round the start down, and the end up */
8056 sector_t next = s + sectors;
8058 next += (1<<bb->shift) - 1;
8063 write_seqlock_irq(&bb->lock);
8068 /* Find the last range that starts at-or-before 's' */
8069 while (hi - lo > 1) {
8070 int mid = (lo + hi) / 2;
8071 sector_t a = BB_OFFSET(p[mid]);
8077 if (hi > lo && BB_OFFSET(p[lo]) > s)
8081 /* we found a range that might merge with the start
8084 sector_t a = BB_OFFSET(p[lo]);
8085 sector_t e = a + BB_LEN(p[lo]);
8086 int ack = BB_ACK(p[lo]);
8088 /* Yes, we can merge with a previous range */
8089 if (s == a && s + sectors >= e)
8090 /* new range covers old */
8093 ack = ack && acknowledged;
8095 if (e < s + sectors)
8097 if (e - a <= BB_MAX_LEN) {
8098 p[lo] = BB_MAKE(a, e-a, ack);
8101 /* does not all fit in one range,
8102 * make p[lo] maximal
8104 if (BB_LEN(p[lo]) != BB_MAX_LEN)
8105 p[lo] = BB_MAKE(a, BB_MAX_LEN, ack);
8111 if (sectors && hi < bb->count) {
8112 /* 'hi' points to the first range that starts after 's'.
8113 * Maybe we can merge with the start of that range */
8114 sector_t a = BB_OFFSET(p[hi]);
8115 sector_t e = a + BB_LEN(p[hi]);
8116 int ack = BB_ACK(p[hi]);
8117 if (a <= s + sectors) {
8118 /* merging is possible */
8119 if (e <= s + sectors) {
8124 ack = ack && acknowledged;
8127 if (e - a <= BB_MAX_LEN) {
8128 p[hi] = BB_MAKE(a, e-a, ack);
8131 p[hi] = BB_MAKE(a, BB_MAX_LEN, ack);
8139 if (sectors == 0 && hi < bb->count) {
8140 /* we might be able to combine lo and hi */
8141 /* Note: 's' is at the end of 'lo' */
8142 sector_t a = BB_OFFSET(p[hi]);
8143 int lolen = BB_LEN(p[lo]);
8144 int hilen = BB_LEN(p[hi]);
8145 int newlen = lolen + hilen - (s - a);
8146 if (s >= a && newlen < BB_MAX_LEN) {
8147 /* yes, we can combine them */
8148 int ack = BB_ACK(p[lo]) && BB_ACK(p[hi]);
8149 p[lo] = BB_MAKE(BB_OFFSET(p[lo]), newlen, ack);
8150 memmove(p + hi, p + hi + 1,
8151 (bb->count - hi - 1) * 8);
8156 /* didn't merge (it all).
8157 * Need to add a range just before 'hi' */
8158 if (bb->count >= MD_MAX_BADBLOCKS) {
8159 /* No room for more */
8163 int this_sectors = sectors;
8164 memmove(p + hi + 1, p + hi,
8165 (bb->count - hi) * 8);
8168 if (this_sectors > BB_MAX_LEN)
8169 this_sectors = BB_MAX_LEN;
8170 p[hi] = BB_MAKE(s, this_sectors, acknowledged);
8171 sectors -= this_sectors;
8178 bb->unacked_exist = 1;
8179 write_sequnlock_irq(&bb->lock);
8184 int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
8189 s += rdev->new_data_offset;
8191 s += rdev->data_offset;
8192 rv = md_set_badblocks(&rdev->badblocks,
8195 /* Make sure they get written out promptly */
8196 sysfs_notify_dirent_safe(rdev->sysfs_state);
8197 set_bit(MD_CHANGE_CLEAN, &rdev->mddev->flags);
8198 md_wakeup_thread(rdev->mddev->thread);
8202 EXPORT_SYMBOL_GPL(rdev_set_badblocks);
8205 * Remove a range of bad blocks from the table.
8206 * This may involve extending the table if we spilt a region,
8207 * but it must not fail. So if the table becomes full, we just
8208 * drop the remove request.
8210 static int md_clear_badblocks(struct badblocks *bb, sector_t s, int sectors)
8214 sector_t target = s + sectors;
8217 if (bb->shift > 0) {
8218 /* When clearing we round the start up and the end down.
8219 * This should not matter as the shift should align with
8220 * the block size and no rounding should ever be needed.
8221 * However it is better the think a block is bad when it
8222 * isn't than to think a block is not bad when it is.
8224 s += (1<<bb->shift) - 1;
8226 target >>= bb->shift;
8227 sectors = target - s;
8230 write_seqlock_irq(&bb->lock);
8235 /* Find the last range that starts before 'target' */
8236 while (hi - lo > 1) {
8237 int mid = (lo + hi) / 2;
8238 sector_t a = BB_OFFSET(p[mid]);
8245 /* p[lo] is the last range that could overlap the
8246 * current range. Earlier ranges could also overlap,
8247 * but only this one can overlap the end of the range.
8249 if (BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > target) {
8250 /* Partial overlap, leave the tail of this range */
8251 int ack = BB_ACK(p[lo]);
8252 sector_t a = BB_OFFSET(p[lo]);
8253 sector_t end = a + BB_LEN(p[lo]);
8256 /* we need to split this range */
8257 if (bb->count >= MD_MAX_BADBLOCKS) {
8261 memmove(p+lo+1, p+lo, (bb->count - lo) * 8);
8263 p[lo] = BB_MAKE(a, s-a, ack);
8266 p[lo] = BB_MAKE(target, end - target, ack);
8267 /* there is no longer an overlap */
8272 BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) {
8273 /* This range does overlap */
8274 if (BB_OFFSET(p[lo]) < s) {
8275 /* Keep the early parts of this range. */
8276 int ack = BB_ACK(p[lo]);
8277 sector_t start = BB_OFFSET(p[lo]);
8278 p[lo] = BB_MAKE(start, s - start, ack);
8279 /* now low doesn't overlap, so.. */
8284 /* 'lo' is strictly before, 'hi' is strictly after,
8285 * anything between needs to be discarded
8288 memmove(p+lo+1, p+hi, (bb->count - hi) * 8);
8289 bb->count -= (hi - lo - 1);
8295 write_sequnlock_irq(&bb->lock);
8299 int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
8303 s += rdev->new_data_offset;
8305 s += rdev->data_offset;
8306 return md_clear_badblocks(&rdev->badblocks,
8309 EXPORT_SYMBOL_GPL(rdev_clear_badblocks);
8312 * Acknowledge all bad blocks in a list.
8313 * This only succeeds if ->changed is clear. It is used by
8314 * in-kernel metadata updates
8316 void md_ack_all_badblocks(struct badblocks *bb)
8318 if (bb->page == NULL || bb->changed)
8319 /* no point even trying */
8321 write_seqlock_irq(&bb->lock);
8323 if (bb->changed == 0 && bb->unacked_exist) {
8326 for (i = 0; i < bb->count ; i++) {
8327 if (!BB_ACK(p[i])) {
8328 sector_t start = BB_OFFSET(p[i]);
8329 int len = BB_LEN(p[i]);
8330 p[i] = BB_MAKE(start, len, 1);
8333 bb->unacked_exist = 0;
8335 write_sequnlock_irq(&bb->lock);
8337 EXPORT_SYMBOL_GPL(md_ack_all_badblocks);
8339 /* sysfs access to bad-blocks list.
8340 * We present two files.
8341 * 'bad-blocks' lists sector numbers and lengths of ranges that
8342 * are recorded as bad. The list is truncated to fit within
8343 * the one-page limit of sysfs.
8344 * Writing "sector length" to this file adds an acknowledged
8346 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
8347 * been acknowledged. Writing to this file adds bad blocks
8348 * without acknowledging them. This is largely for testing.
8352 badblocks_show(struct badblocks *bb, char *page, int unack)
8363 seq = read_seqbegin(&bb->lock);
8368 while (len < PAGE_SIZE && i < bb->count) {
8369 sector_t s = BB_OFFSET(p[i]);
8370 unsigned int length = BB_LEN(p[i]);
8371 int ack = BB_ACK(p[i]);
8377 len += snprintf(page+len, PAGE_SIZE-len, "%llu %u\n",
8378 (unsigned long long)s << bb->shift,
8379 length << bb->shift);
8381 if (unack && len == 0)
8382 bb->unacked_exist = 0;
8384 if (read_seqretry(&bb->lock, seq))
8393 badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack)
8395 unsigned long long sector;
8399 /* Allow clearing via sysfs *only* for testing/debugging.
8400 * Normally only a successful write may clear a badblock
8403 if (page[0] == '-') {
8407 #endif /* DO_DEBUG */
8409 switch (sscanf(page, "%llu %d%c", §or, &length, &newline)) {
8411 if (newline != '\n')
8423 md_clear_badblocks(bb, sector, length);
8426 #endif /* DO_DEBUG */
8427 if (md_set_badblocks(bb, sector, length, !unack))
8433 static int md_notify_reboot(struct notifier_block *this,
8434 unsigned long code, void *x)
8436 struct list_head *tmp;
8437 struct mddev *mddev;
8440 for_each_mddev(mddev, tmp) {
8441 if (mddev_trylock(mddev)) {
8443 __md_stop_writes(mddev);
8444 mddev->safemode = 2;
8445 mddev_unlock(mddev);
8450 * certain more exotic SCSI devices are known to be
8451 * volatile wrt too early system reboots. While the
8452 * right place to handle this issue is the given
8453 * driver, we do want to have a safe RAID driver ...
8461 static struct notifier_block md_notifier = {
8462 .notifier_call = md_notify_reboot,
8464 .priority = INT_MAX, /* before any real devices */
8467 static void md_geninit(void)
8469 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
8471 proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops);
8474 static int __init md_init(void)
8478 md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0);
8482 md_misc_wq = alloc_workqueue("md_misc", 0, 0);
8486 if ((ret = register_blkdev(MD_MAJOR, "md")) < 0)
8489 if ((ret = register_blkdev(0, "mdp")) < 0)
8493 blk_register_region(MKDEV(MD_MAJOR, 0), 1UL<<MINORBITS, THIS_MODULE,
8494 md_probe, NULL, NULL);
8495 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
8496 md_probe, NULL, NULL);
8498 register_reboot_notifier(&md_notifier);
8499 raid_table_header = register_sysctl_table(raid_root_table);
8505 unregister_blkdev(MD_MAJOR, "md");
8507 destroy_workqueue(md_misc_wq);
8509 destroy_workqueue(md_wq);
8517 * Searches all registered partitions for autorun RAID arrays
8521 static LIST_HEAD(all_detected_devices);
8522 struct detected_devices_node {
8523 struct list_head list;
8527 void md_autodetect_dev(dev_t dev)
8529 struct detected_devices_node *node_detected_dev;
8531 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
8532 if (node_detected_dev) {
8533 node_detected_dev->dev = dev;
8534 list_add_tail(&node_detected_dev->list, &all_detected_devices);
8536 printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed"
8537 ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev));
8542 static void autostart_arrays(int part)
8544 struct md_rdev *rdev;
8545 struct detected_devices_node *node_detected_dev;
8547 int i_scanned, i_passed;
8552 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
8554 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
8556 node_detected_dev = list_entry(all_detected_devices.next,
8557 struct detected_devices_node, list);
8558 list_del(&node_detected_dev->list);
8559 dev = node_detected_dev->dev;
8560 kfree(node_detected_dev);
8561 rdev = md_import_device(dev,0, 90);
8565 if (test_bit(Faulty, &rdev->flags)) {
8569 set_bit(AutoDetected, &rdev->flags);
8570 list_add(&rdev->same_set, &pending_raid_disks);
8574 printk(KERN_INFO "md: Scanned %d and added %d devices.\n",
8575 i_scanned, i_passed);
8577 autorun_devices(part);
8580 #endif /* !MODULE */
8582 static __exit void md_exit(void)
8584 struct mddev *mddev;
8585 struct list_head *tmp;
8587 blk_unregister_region(MKDEV(MD_MAJOR,0), 1U << MINORBITS);
8588 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
8590 unregister_blkdev(MD_MAJOR,"md");
8591 unregister_blkdev(mdp_major, "mdp");
8592 unregister_reboot_notifier(&md_notifier);
8593 unregister_sysctl_table(raid_table_header);
8594 remove_proc_entry("mdstat", NULL);
8595 for_each_mddev(mddev, tmp) {
8596 export_array(mddev);
8597 mddev->hold_active = 0;
8599 destroy_workqueue(md_misc_wq);
8600 destroy_workqueue(md_wq);
8603 subsys_initcall(md_init);
8604 module_exit(md_exit)
8606 static int get_ro(char *buffer, struct kernel_param *kp)
8608 return sprintf(buffer, "%d", start_readonly);
8610 static int set_ro(const char *val, struct kernel_param *kp)
8613 int num = simple_strtoul(val, &e, 10);
8614 if (*val && (*e == '\0' || *e == '\n')) {
8615 start_readonly = num;
8621 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
8622 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
8624 module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR);
8626 EXPORT_SYMBOL(register_md_personality);
8627 EXPORT_SYMBOL(unregister_md_personality);
8628 EXPORT_SYMBOL(md_error);
8629 EXPORT_SYMBOL(md_done_sync);
8630 EXPORT_SYMBOL(md_write_start);
8631 EXPORT_SYMBOL(md_write_end);
8632 EXPORT_SYMBOL(md_register_thread);
8633 EXPORT_SYMBOL(md_unregister_thread);
8634 EXPORT_SYMBOL(md_wakeup_thread);
8635 EXPORT_SYMBOL(md_check_recovery);
8636 MODULE_LICENSE("GPL");
8637 MODULE_DESCRIPTION("MD RAID framework");
8639 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);