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 static int remove_and_add_spares(struct mddev *mddev,
76 struct md_rdev *this);
78 #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
81 * Default number of read corrections we'll attempt on an rdev
82 * before ejecting it from the array. We divide the read error
83 * count by 2 for every hour elapsed between read errors.
85 #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
87 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
88 * is 1000 KB/sec, so the extra system load does not show up that much.
89 * Increase it if you want to have more _guaranteed_ speed. Note that
90 * the RAID driver will use the maximum available bandwidth if the IO
91 * subsystem is idle. There is also an 'absolute maximum' reconstruction
92 * speed limit - in case reconstruction slows down your system despite
95 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
96 * or /sys/block/mdX/md/sync_speed_{min,max}
99 static int sysctl_speed_limit_min = 1000;
100 static int sysctl_speed_limit_max = 200000;
101 static inline int speed_min(struct mddev *mddev)
103 return mddev->sync_speed_min ?
104 mddev->sync_speed_min : sysctl_speed_limit_min;
107 static inline int speed_max(struct mddev *mddev)
109 return mddev->sync_speed_max ?
110 mddev->sync_speed_max : sysctl_speed_limit_max;
113 static struct ctl_table_header *raid_table_header;
115 static struct ctl_table raid_table[] = {
117 .procname = "speed_limit_min",
118 .data = &sysctl_speed_limit_min,
119 .maxlen = sizeof(int),
120 .mode = S_IRUGO|S_IWUSR,
121 .proc_handler = proc_dointvec,
124 .procname = "speed_limit_max",
125 .data = &sysctl_speed_limit_max,
126 .maxlen = sizeof(int),
127 .mode = S_IRUGO|S_IWUSR,
128 .proc_handler = proc_dointvec,
133 static struct ctl_table raid_dir_table[] = {
137 .mode = S_IRUGO|S_IXUGO,
143 static struct ctl_table raid_root_table[] = {
148 .child = raid_dir_table,
153 static const struct block_device_operations md_fops;
155 static int start_readonly;
158 * like bio_clone, but with a local bio set
161 struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs,
166 if (!mddev || !mddev->bio_set)
167 return bio_alloc(gfp_mask, nr_iovecs);
169 b = bio_alloc_bioset(gfp_mask, nr_iovecs, mddev->bio_set);
174 EXPORT_SYMBOL_GPL(bio_alloc_mddev);
176 struct bio *bio_clone_mddev(struct bio *bio, gfp_t gfp_mask,
179 if (!mddev || !mddev->bio_set)
180 return bio_clone(bio, gfp_mask);
182 return bio_clone_bioset(bio, gfp_mask, mddev->bio_set);
184 EXPORT_SYMBOL_GPL(bio_clone_mddev);
187 * We have a system wide 'event count' that is incremented
188 * on any 'interesting' event, and readers of /proc/mdstat
189 * can use 'poll' or 'select' to find out when the event
193 * start array, stop array, error, add device, remove device,
194 * start build, activate spare
196 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
197 static atomic_t md_event_count;
198 void md_new_event(struct mddev *mddev)
200 atomic_inc(&md_event_count);
201 wake_up(&md_event_waiters);
203 EXPORT_SYMBOL_GPL(md_new_event);
205 /* Alternate version that can be called from interrupts
206 * when calling sysfs_notify isn't needed.
208 static void md_new_event_inintr(struct mddev *mddev)
210 atomic_inc(&md_event_count);
211 wake_up(&md_event_waiters);
215 * Enables to iterate over all existing md arrays
216 * all_mddevs_lock protects this list.
218 static LIST_HEAD(all_mddevs);
219 static DEFINE_SPINLOCK(all_mddevs_lock);
223 * iterates through all used mddevs in the system.
224 * We take care to grab the all_mddevs_lock whenever navigating
225 * the list, and to always hold a refcount when unlocked.
226 * Any code which breaks out of this loop while own
227 * a reference to the current mddev and must mddev_put it.
229 #define for_each_mddev(_mddev,_tmp) \
231 for (({ spin_lock(&all_mddevs_lock); \
232 _tmp = all_mddevs.next; \
234 ({ if (_tmp != &all_mddevs) \
235 mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\
236 spin_unlock(&all_mddevs_lock); \
237 if (_mddev) mddev_put(_mddev); \
238 _mddev = list_entry(_tmp, struct mddev, all_mddevs); \
239 _tmp != &all_mddevs;}); \
240 ({ spin_lock(&all_mddevs_lock); \
241 _tmp = _tmp->next;}) \
245 /* Rather than calling directly into the personality make_request function,
246 * IO requests come here first so that we can check if the device is
247 * being suspended pending a reconfiguration.
248 * We hold a refcount over the call to ->make_request. By the time that
249 * call has finished, the bio has been linked into some internal structure
250 * and so is visible to ->quiesce(), so we don't need the refcount any more.
252 static void md_make_request(struct request_queue *q, struct bio *bio)
254 const int rw = bio_data_dir(bio);
255 struct mddev *mddev = q->queuedata;
257 unsigned int sectors;
259 if (mddev == NULL || mddev->pers == NULL
264 if (mddev->ro == 1 && unlikely(rw == WRITE)) {
265 bio_endio(bio, bio_sectors(bio) == 0 ? 0 : -EROFS);
268 smp_rmb(); /* Ensure implications of 'active' are visible */
270 if (mddev->suspended) {
273 prepare_to_wait(&mddev->sb_wait, &__wait,
274 TASK_UNINTERRUPTIBLE);
275 if (!mddev->suspended)
281 finish_wait(&mddev->sb_wait, &__wait);
283 atomic_inc(&mddev->active_io);
287 * save the sectors now since our bio can
288 * go away inside make_request
290 sectors = bio_sectors(bio);
291 mddev->pers->make_request(mddev, bio);
293 cpu = part_stat_lock();
294 part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]);
295 part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw], sectors);
298 if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended)
299 wake_up(&mddev->sb_wait);
302 /* mddev_suspend makes sure no new requests are submitted
303 * to the device, and that any requests that have been submitted
304 * are completely handled.
305 * Once ->stop is called and completes, the module will be completely
308 void mddev_suspend(struct mddev *mddev)
310 BUG_ON(mddev->suspended);
311 mddev->suspended = 1;
313 wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0);
314 mddev->pers->quiesce(mddev, 1);
316 del_timer_sync(&mddev->safemode_timer);
318 EXPORT_SYMBOL_GPL(mddev_suspend);
320 void mddev_resume(struct mddev *mddev)
322 mddev->suspended = 0;
323 wake_up(&mddev->sb_wait);
324 mddev->pers->quiesce(mddev, 0);
326 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
327 md_wakeup_thread(mddev->thread);
328 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
330 EXPORT_SYMBOL_GPL(mddev_resume);
332 int mddev_congested(struct mddev *mddev, int bits)
334 return mddev->suspended;
336 EXPORT_SYMBOL(mddev_congested);
339 * Generic flush handling for md
342 static void md_end_flush(struct bio *bio, int err)
344 struct md_rdev *rdev = bio->bi_private;
345 struct mddev *mddev = rdev->mddev;
347 rdev_dec_pending(rdev, mddev);
349 if (atomic_dec_and_test(&mddev->flush_pending)) {
350 /* The pre-request flush has finished */
351 queue_work(md_wq, &mddev->flush_work);
356 static void md_submit_flush_data(struct work_struct *ws);
358 static void submit_flushes(struct work_struct *ws)
360 struct mddev *mddev = container_of(ws, struct mddev, flush_work);
361 struct md_rdev *rdev;
363 INIT_WORK(&mddev->flush_work, md_submit_flush_data);
364 atomic_set(&mddev->flush_pending, 1);
366 rdev_for_each_rcu(rdev, mddev)
367 if (rdev->raid_disk >= 0 &&
368 !test_bit(Faulty, &rdev->flags)) {
369 /* Take two references, one is dropped
370 * when request finishes, one after
371 * we reclaim rcu_read_lock
374 atomic_inc(&rdev->nr_pending);
375 atomic_inc(&rdev->nr_pending);
377 bi = bio_alloc_mddev(GFP_NOIO, 0, mddev);
378 bi->bi_end_io = md_end_flush;
379 bi->bi_private = rdev;
380 bi->bi_bdev = rdev->bdev;
381 atomic_inc(&mddev->flush_pending);
382 submit_bio(WRITE_FLUSH, bi);
384 rdev_dec_pending(rdev, mddev);
387 if (atomic_dec_and_test(&mddev->flush_pending))
388 queue_work(md_wq, &mddev->flush_work);
391 static void md_submit_flush_data(struct work_struct *ws)
393 struct mddev *mddev = container_of(ws, struct mddev, flush_work);
394 struct bio *bio = mddev->flush_bio;
396 if (bio->bi_iter.bi_size == 0)
397 /* an empty barrier - all done */
400 bio->bi_rw &= ~REQ_FLUSH;
401 mddev->pers->make_request(mddev, bio);
404 mddev->flush_bio = NULL;
405 wake_up(&mddev->sb_wait);
408 void md_flush_request(struct mddev *mddev, struct bio *bio)
410 spin_lock_irq(&mddev->write_lock);
411 wait_event_lock_irq(mddev->sb_wait,
414 mddev->flush_bio = bio;
415 spin_unlock_irq(&mddev->write_lock);
417 INIT_WORK(&mddev->flush_work, submit_flushes);
418 queue_work(md_wq, &mddev->flush_work);
420 EXPORT_SYMBOL(md_flush_request);
422 void md_unplug(struct blk_plug_cb *cb, bool from_schedule)
424 struct mddev *mddev = cb->data;
425 md_wakeup_thread(mddev->thread);
428 EXPORT_SYMBOL(md_unplug);
430 static inline struct mddev *mddev_get(struct mddev *mddev)
432 atomic_inc(&mddev->active);
436 static void mddev_delayed_delete(struct work_struct *ws);
438 static void mddev_put(struct mddev *mddev)
440 struct bio_set *bs = NULL;
442 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
444 if (!mddev->raid_disks && list_empty(&mddev->disks) &&
445 mddev->ctime == 0 && !mddev->hold_active) {
446 /* Array is not configured at all, and not held active,
448 list_del_init(&mddev->all_mddevs);
450 mddev->bio_set = NULL;
451 if (mddev->gendisk) {
452 /* We did a probe so need to clean up. Call
453 * queue_work inside the spinlock so that
454 * flush_workqueue() after mddev_find will
455 * succeed in waiting for the work to be done.
457 INIT_WORK(&mddev->del_work, mddev_delayed_delete);
458 queue_work(md_misc_wq, &mddev->del_work);
462 spin_unlock(&all_mddevs_lock);
467 void mddev_init(struct mddev *mddev)
469 mutex_init(&mddev->open_mutex);
470 mutex_init(&mddev->reconfig_mutex);
471 mutex_init(&mddev->bitmap_info.mutex);
472 INIT_LIST_HEAD(&mddev->disks);
473 INIT_LIST_HEAD(&mddev->all_mddevs);
474 init_timer(&mddev->safemode_timer);
475 atomic_set(&mddev->active, 1);
476 atomic_set(&mddev->openers, 0);
477 atomic_set(&mddev->active_io, 0);
478 spin_lock_init(&mddev->write_lock);
479 atomic_set(&mddev->flush_pending, 0);
480 init_waitqueue_head(&mddev->sb_wait);
481 init_waitqueue_head(&mddev->recovery_wait);
482 mddev->reshape_position = MaxSector;
483 mddev->reshape_backwards = 0;
484 mddev->last_sync_action = "none";
485 mddev->resync_min = 0;
486 mddev->resync_max = MaxSector;
487 mddev->level = LEVEL_NONE;
489 EXPORT_SYMBOL_GPL(mddev_init);
491 static struct mddev * mddev_find(dev_t unit)
493 struct mddev *mddev, *new = NULL;
495 if (unit && MAJOR(unit) != MD_MAJOR)
496 unit &= ~((1<<MdpMinorShift)-1);
499 spin_lock(&all_mddevs_lock);
502 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
503 if (mddev->unit == unit) {
505 spin_unlock(&all_mddevs_lock);
511 list_add(&new->all_mddevs, &all_mddevs);
512 spin_unlock(&all_mddevs_lock);
513 new->hold_active = UNTIL_IOCTL;
517 /* find an unused unit number */
518 static int next_minor = 512;
519 int start = next_minor;
523 dev = MKDEV(MD_MAJOR, next_minor);
525 if (next_minor > MINORMASK)
527 if (next_minor == start) {
528 /* Oh dear, all in use. */
529 spin_unlock(&all_mddevs_lock);
535 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
536 if (mddev->unit == dev) {
542 new->md_minor = MINOR(dev);
543 new->hold_active = UNTIL_STOP;
544 list_add(&new->all_mddevs, &all_mddevs);
545 spin_unlock(&all_mddevs_lock);
548 spin_unlock(&all_mddevs_lock);
550 new = kzalloc(sizeof(*new), GFP_KERNEL);
555 if (MAJOR(unit) == MD_MAJOR)
556 new->md_minor = MINOR(unit);
558 new->md_minor = MINOR(unit) >> MdpMinorShift;
565 static inline int __must_check mddev_lock(struct mddev * mddev)
567 return mutex_lock_interruptible(&mddev->reconfig_mutex);
570 /* Sometimes we need to take the lock in a situation where
571 * failure due to interrupts is not acceptable.
573 static inline void mddev_lock_nointr(struct mddev * mddev)
575 mutex_lock(&mddev->reconfig_mutex);
578 static inline int mddev_is_locked(struct mddev *mddev)
580 return mutex_is_locked(&mddev->reconfig_mutex);
583 static inline int mddev_trylock(struct mddev * mddev)
585 return mutex_trylock(&mddev->reconfig_mutex);
588 static struct attribute_group md_redundancy_group;
590 static void mddev_unlock(struct mddev * mddev)
592 if (mddev->to_remove) {
593 /* These cannot be removed under reconfig_mutex as
594 * an access to the files will try to take reconfig_mutex
595 * while holding the file unremovable, which leads to
597 * So hold set sysfs_active while the remove in happeing,
598 * and anything else which might set ->to_remove or my
599 * otherwise change the sysfs namespace will fail with
600 * -EBUSY if sysfs_active is still set.
601 * We set sysfs_active under reconfig_mutex and elsewhere
602 * test it under the same mutex to ensure its correct value
605 struct attribute_group *to_remove = mddev->to_remove;
606 mddev->to_remove = NULL;
607 mddev->sysfs_active = 1;
608 mutex_unlock(&mddev->reconfig_mutex);
610 if (mddev->kobj.sd) {
611 if (to_remove != &md_redundancy_group)
612 sysfs_remove_group(&mddev->kobj, to_remove);
613 if (mddev->pers == NULL ||
614 mddev->pers->sync_request == NULL) {
615 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
616 if (mddev->sysfs_action)
617 sysfs_put(mddev->sysfs_action);
618 mddev->sysfs_action = NULL;
621 mddev->sysfs_active = 0;
623 mutex_unlock(&mddev->reconfig_mutex);
625 /* As we've dropped the mutex we need a spinlock to
626 * make sure the thread doesn't disappear
628 spin_lock(&pers_lock);
629 md_wakeup_thread(mddev->thread);
630 spin_unlock(&pers_lock);
633 static struct md_rdev * find_rdev_nr(struct mddev *mddev, int nr)
635 struct md_rdev *rdev;
637 rdev_for_each(rdev, mddev)
638 if (rdev->desc_nr == nr)
644 static struct md_rdev *find_rdev_nr_rcu(struct mddev *mddev, int nr)
646 struct md_rdev *rdev;
648 rdev_for_each_rcu(rdev, mddev)
649 if (rdev->desc_nr == nr)
655 static struct md_rdev *find_rdev(struct mddev *mddev, dev_t dev)
657 struct md_rdev *rdev;
659 rdev_for_each(rdev, mddev)
660 if (rdev->bdev->bd_dev == dev)
666 static struct md_rdev *find_rdev_rcu(struct mddev *mddev, dev_t dev)
668 struct md_rdev *rdev;
670 rdev_for_each_rcu(rdev, mddev)
671 if (rdev->bdev->bd_dev == dev)
677 static struct md_personality *find_pers(int level, char *clevel)
679 struct md_personality *pers;
680 list_for_each_entry(pers, &pers_list, list) {
681 if (level != LEVEL_NONE && pers->level == level)
683 if (strcmp(pers->name, clevel)==0)
689 /* return the offset of the super block in 512byte sectors */
690 static inline sector_t calc_dev_sboffset(struct md_rdev *rdev)
692 sector_t num_sectors = i_size_read(rdev->bdev->bd_inode) / 512;
693 return MD_NEW_SIZE_SECTORS(num_sectors);
696 static int alloc_disk_sb(struct md_rdev * rdev)
701 rdev->sb_page = alloc_page(GFP_KERNEL);
702 if (!rdev->sb_page) {
703 printk(KERN_ALERT "md: out of memory.\n");
710 void md_rdev_clear(struct md_rdev *rdev)
713 put_page(rdev->sb_page);
715 rdev->sb_page = NULL;
720 put_page(rdev->bb_page);
721 rdev->bb_page = NULL;
723 kfree(rdev->badblocks.page);
724 rdev->badblocks.page = NULL;
726 EXPORT_SYMBOL_GPL(md_rdev_clear);
728 static void super_written(struct bio *bio, int error)
730 struct md_rdev *rdev = bio->bi_private;
731 struct mddev *mddev = rdev->mddev;
733 if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) {
734 printk("md: super_written gets error=%d, uptodate=%d\n",
735 error, test_bit(BIO_UPTODATE, &bio->bi_flags));
736 WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags));
737 md_error(mddev, rdev);
740 if (atomic_dec_and_test(&mddev->pending_writes))
741 wake_up(&mddev->sb_wait);
745 void md_super_write(struct mddev *mddev, struct md_rdev *rdev,
746 sector_t sector, int size, struct page *page)
748 /* write first size bytes of page to sector of rdev
749 * Increment mddev->pending_writes before returning
750 * and decrement it on completion, waking up sb_wait
751 * if zero is reached.
752 * If an error occurred, call md_error
754 struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, mddev);
756 bio->bi_bdev = rdev->meta_bdev ? rdev->meta_bdev : rdev->bdev;
757 bio->bi_iter.bi_sector = sector;
758 bio_add_page(bio, page, size, 0);
759 bio->bi_private = rdev;
760 bio->bi_end_io = super_written;
762 atomic_inc(&mddev->pending_writes);
763 submit_bio(WRITE_FLUSH_FUA, bio);
766 void md_super_wait(struct mddev *mddev)
768 /* wait for all superblock writes that were scheduled to complete */
769 wait_event(mddev->sb_wait, atomic_read(&mddev->pending_writes)==0);
772 int sync_page_io(struct md_rdev *rdev, sector_t sector, int size,
773 struct page *page, int rw, bool metadata_op)
775 struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, rdev->mddev);
778 bio->bi_bdev = (metadata_op && rdev->meta_bdev) ?
779 rdev->meta_bdev : rdev->bdev;
781 bio->bi_iter.bi_sector = sector + rdev->sb_start;
782 else if (rdev->mddev->reshape_position != MaxSector &&
783 (rdev->mddev->reshape_backwards ==
784 (sector >= rdev->mddev->reshape_position)))
785 bio->bi_iter.bi_sector = sector + rdev->new_data_offset;
787 bio->bi_iter.bi_sector = sector + rdev->data_offset;
788 bio_add_page(bio, page, size, 0);
789 submit_bio_wait(rw, bio);
791 ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
795 EXPORT_SYMBOL_GPL(sync_page_io);
797 static int read_disk_sb(struct md_rdev * rdev, int size)
799 char b[BDEVNAME_SIZE];
800 if (!rdev->sb_page) {
808 if (!sync_page_io(rdev, 0, size, rdev->sb_page, READ, true))
814 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
815 bdevname(rdev->bdev,b));
819 static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
821 return sb1->set_uuid0 == sb2->set_uuid0 &&
822 sb1->set_uuid1 == sb2->set_uuid1 &&
823 sb1->set_uuid2 == sb2->set_uuid2 &&
824 sb1->set_uuid3 == sb2->set_uuid3;
827 static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
830 mdp_super_t *tmp1, *tmp2;
832 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
833 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
835 if (!tmp1 || !tmp2) {
837 printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n");
845 * nr_disks is not constant
850 ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0);
858 static u32 md_csum_fold(u32 csum)
860 csum = (csum & 0xffff) + (csum >> 16);
861 return (csum & 0xffff) + (csum >> 16);
864 static unsigned int calc_sb_csum(mdp_super_t * sb)
867 u32 *sb32 = (u32*)sb;
869 unsigned int disk_csum, csum;
871 disk_csum = sb->sb_csum;
874 for (i = 0; i < MD_SB_BYTES/4 ; i++)
876 csum = (newcsum & 0xffffffff) + (newcsum>>32);
880 /* This used to use csum_partial, which was wrong for several
881 * reasons including that different results are returned on
882 * different architectures. It isn't critical that we get exactly
883 * the same return value as before (we always csum_fold before
884 * testing, and that removes any differences). However as we
885 * know that csum_partial always returned a 16bit value on
886 * alphas, do a fold to maximise conformity to previous behaviour.
888 sb->sb_csum = md_csum_fold(disk_csum);
890 sb->sb_csum = disk_csum;
897 * Handle superblock details.
898 * We want to be able to handle multiple superblock formats
899 * so we have a common interface to them all, and an array of
900 * different handlers.
901 * We rely on user-space to write the initial superblock, and support
902 * reading and updating of superblocks.
903 * Interface methods are:
904 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version)
905 * loads and validates a superblock on dev.
906 * if refdev != NULL, compare superblocks on both devices
908 * 0 - dev has a superblock that is compatible with refdev
909 * 1 - dev has a superblock that is compatible and newer than refdev
910 * so dev should be used as the refdev in future
911 * -EINVAL superblock incompatible or invalid
912 * -othererror e.g. -EIO
914 * int validate_super(struct mddev *mddev, struct md_rdev *dev)
915 * Verify that dev is acceptable into mddev.
916 * The first time, mddev->raid_disks will be 0, and data from
917 * dev should be merged in. Subsequent calls check that dev
918 * is new enough. Return 0 or -EINVAL
920 * void sync_super(struct mddev *mddev, struct md_rdev *dev)
921 * Update the superblock for rdev with data in mddev
922 * This does not write to disc.
928 struct module *owner;
929 int (*load_super)(struct md_rdev *rdev,
930 struct md_rdev *refdev,
932 int (*validate_super)(struct mddev *mddev,
933 struct md_rdev *rdev);
934 void (*sync_super)(struct mddev *mddev,
935 struct md_rdev *rdev);
936 unsigned long long (*rdev_size_change)(struct md_rdev *rdev,
937 sector_t num_sectors);
938 int (*allow_new_offset)(struct md_rdev *rdev,
939 unsigned long long new_offset);
943 * Check that the given mddev has no bitmap.
945 * This function is called from the run method of all personalities that do not
946 * support bitmaps. It prints an error message and returns non-zero if mddev
947 * has a bitmap. Otherwise, it returns 0.
950 int md_check_no_bitmap(struct mddev *mddev)
952 if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset)
954 printk(KERN_ERR "%s: bitmaps are not supported for %s\n",
955 mdname(mddev), mddev->pers->name);
958 EXPORT_SYMBOL(md_check_no_bitmap);
961 * load_super for 0.90.0
963 static int super_90_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
965 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
970 * Calculate the position of the superblock (512byte sectors),
971 * it's at the end of the disk.
973 * It also happens to be a multiple of 4Kb.
975 rdev->sb_start = calc_dev_sboffset(rdev);
977 ret = read_disk_sb(rdev, MD_SB_BYTES);
982 bdevname(rdev->bdev, b);
983 sb = page_address(rdev->sb_page);
985 if (sb->md_magic != MD_SB_MAGIC) {
986 printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
991 if (sb->major_version != 0 ||
992 sb->minor_version < 90 ||
993 sb->minor_version > 91) {
994 printk(KERN_WARNING "Bad version number %d.%d on %s\n",
995 sb->major_version, sb->minor_version,
1000 if (sb->raid_disks <= 0)
1003 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
1004 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
1009 rdev->preferred_minor = sb->md_minor;
1010 rdev->data_offset = 0;
1011 rdev->new_data_offset = 0;
1012 rdev->sb_size = MD_SB_BYTES;
1013 rdev->badblocks.shift = -1;
1015 if (sb->level == LEVEL_MULTIPATH)
1018 rdev->desc_nr = sb->this_disk.number;
1024 mdp_super_t *refsb = page_address(refdev->sb_page);
1025 if (!uuid_equal(refsb, sb)) {
1026 printk(KERN_WARNING "md: %s has different UUID to %s\n",
1027 b, bdevname(refdev->bdev,b2));
1030 if (!sb_equal(refsb, sb)) {
1031 printk(KERN_WARNING "md: %s has same UUID"
1032 " but different superblock to %s\n",
1033 b, bdevname(refdev->bdev, b2));
1037 ev2 = md_event(refsb);
1043 rdev->sectors = rdev->sb_start;
1044 /* Limit to 4TB as metadata cannot record more than that.
1045 * (not needed for Linear and RAID0 as metadata doesn't
1048 if (rdev->sectors >= (2ULL << 32) && sb->level >= 1)
1049 rdev->sectors = (2ULL << 32) - 2;
1051 if (rdev->sectors < ((sector_t)sb->size) * 2 && sb->level >= 1)
1052 /* "this cannot possibly happen" ... */
1060 * validate_super for 0.90.0
1062 static int super_90_validate(struct mddev *mddev, struct md_rdev *rdev)
1065 mdp_super_t *sb = page_address(rdev->sb_page);
1066 __u64 ev1 = md_event(sb);
1068 rdev->raid_disk = -1;
1069 clear_bit(Faulty, &rdev->flags);
1070 clear_bit(In_sync, &rdev->flags);
1071 clear_bit(Bitmap_sync, &rdev->flags);
1072 clear_bit(WriteMostly, &rdev->flags);
1074 if (mddev->raid_disks == 0) {
1075 mddev->major_version = 0;
1076 mddev->minor_version = sb->minor_version;
1077 mddev->patch_version = sb->patch_version;
1078 mddev->external = 0;
1079 mddev->chunk_sectors = sb->chunk_size >> 9;
1080 mddev->ctime = sb->ctime;
1081 mddev->utime = sb->utime;
1082 mddev->level = sb->level;
1083 mddev->clevel[0] = 0;
1084 mddev->layout = sb->layout;
1085 mddev->raid_disks = sb->raid_disks;
1086 mddev->dev_sectors = ((sector_t)sb->size) * 2;
1087 mddev->events = ev1;
1088 mddev->bitmap_info.offset = 0;
1089 mddev->bitmap_info.space = 0;
1090 /* bitmap can use 60 K after the 4K superblocks */
1091 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
1092 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
1093 mddev->reshape_backwards = 0;
1095 if (mddev->minor_version >= 91) {
1096 mddev->reshape_position = sb->reshape_position;
1097 mddev->delta_disks = sb->delta_disks;
1098 mddev->new_level = sb->new_level;
1099 mddev->new_layout = sb->new_layout;
1100 mddev->new_chunk_sectors = sb->new_chunk >> 9;
1101 if (mddev->delta_disks < 0)
1102 mddev->reshape_backwards = 1;
1104 mddev->reshape_position = MaxSector;
1105 mddev->delta_disks = 0;
1106 mddev->new_level = mddev->level;
1107 mddev->new_layout = mddev->layout;
1108 mddev->new_chunk_sectors = mddev->chunk_sectors;
1111 if (sb->state & (1<<MD_SB_CLEAN))
1112 mddev->recovery_cp = MaxSector;
1114 if (sb->events_hi == sb->cp_events_hi &&
1115 sb->events_lo == sb->cp_events_lo) {
1116 mddev->recovery_cp = sb->recovery_cp;
1118 mddev->recovery_cp = 0;
1121 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
1122 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
1123 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
1124 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
1126 mddev->max_disks = MD_SB_DISKS;
1128 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
1129 mddev->bitmap_info.file == NULL) {
1130 mddev->bitmap_info.offset =
1131 mddev->bitmap_info.default_offset;
1132 mddev->bitmap_info.space =
1133 mddev->bitmap_info.default_space;
1136 } else if (mddev->pers == NULL) {
1137 /* Insist on good event counter while assembling, except
1138 * for spares (which don't need an event count) */
1140 if (sb->disks[rdev->desc_nr].state & (
1141 (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE)))
1142 if (ev1 < mddev->events)
1144 } else if (mddev->bitmap) {
1145 /* if adding to array with a bitmap, then we can accept an
1146 * older device ... but not too old.
1148 if (ev1 < mddev->bitmap->events_cleared)
1150 if (ev1 < mddev->events)
1151 set_bit(Bitmap_sync, &rdev->flags);
1153 if (ev1 < mddev->events)
1154 /* just a hot-add of a new device, leave raid_disk at -1 */
1158 if (mddev->level != LEVEL_MULTIPATH) {
1159 desc = sb->disks + rdev->desc_nr;
1161 if (desc->state & (1<<MD_DISK_FAULTY))
1162 set_bit(Faulty, &rdev->flags);
1163 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
1164 desc->raid_disk < mddev->raid_disks */) {
1165 set_bit(In_sync, &rdev->flags);
1166 rdev->raid_disk = desc->raid_disk;
1167 rdev->saved_raid_disk = desc->raid_disk;
1168 } else if (desc->state & (1<<MD_DISK_ACTIVE)) {
1169 /* active but not in sync implies recovery up to
1170 * reshape position. We don't know exactly where
1171 * that is, so set to zero for now */
1172 if (mddev->minor_version >= 91) {
1173 rdev->recovery_offset = 0;
1174 rdev->raid_disk = desc->raid_disk;
1177 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
1178 set_bit(WriteMostly, &rdev->flags);
1179 } else /* MULTIPATH are always insync */
1180 set_bit(In_sync, &rdev->flags);
1185 * sync_super for 0.90.0
1187 static void super_90_sync(struct mddev *mddev, struct md_rdev *rdev)
1190 struct md_rdev *rdev2;
1191 int next_spare = mddev->raid_disks;
1194 /* make rdev->sb match mddev data..
1197 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1198 * 3/ any empty disks < next_spare become removed
1200 * disks[0] gets initialised to REMOVED because
1201 * we cannot be sure from other fields if it has
1202 * been initialised or not.
1205 int active=0, working=0,failed=0,spare=0,nr_disks=0;
1207 rdev->sb_size = MD_SB_BYTES;
1209 sb = page_address(rdev->sb_page);
1211 memset(sb, 0, sizeof(*sb));
1213 sb->md_magic = MD_SB_MAGIC;
1214 sb->major_version = mddev->major_version;
1215 sb->patch_version = mddev->patch_version;
1216 sb->gvalid_words = 0; /* ignored */
1217 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
1218 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
1219 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
1220 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
1222 sb->ctime = mddev->ctime;
1223 sb->level = mddev->level;
1224 sb->size = mddev->dev_sectors / 2;
1225 sb->raid_disks = mddev->raid_disks;
1226 sb->md_minor = mddev->md_minor;
1227 sb->not_persistent = 0;
1228 sb->utime = mddev->utime;
1230 sb->events_hi = (mddev->events>>32);
1231 sb->events_lo = (u32)mddev->events;
1233 if (mddev->reshape_position == MaxSector)
1234 sb->minor_version = 90;
1236 sb->minor_version = 91;
1237 sb->reshape_position = mddev->reshape_position;
1238 sb->new_level = mddev->new_level;
1239 sb->delta_disks = mddev->delta_disks;
1240 sb->new_layout = mddev->new_layout;
1241 sb->new_chunk = mddev->new_chunk_sectors << 9;
1243 mddev->minor_version = sb->minor_version;
1246 sb->recovery_cp = mddev->recovery_cp;
1247 sb->cp_events_hi = (mddev->events>>32);
1248 sb->cp_events_lo = (u32)mddev->events;
1249 if (mddev->recovery_cp == MaxSector)
1250 sb->state = (1<< MD_SB_CLEAN);
1252 sb->recovery_cp = 0;
1254 sb->layout = mddev->layout;
1255 sb->chunk_size = mddev->chunk_sectors << 9;
1257 if (mddev->bitmap && mddev->bitmap_info.file == NULL)
1258 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
1260 sb->disks[0].state = (1<<MD_DISK_REMOVED);
1261 rdev_for_each(rdev2, mddev) {
1264 int is_active = test_bit(In_sync, &rdev2->flags);
1266 if (rdev2->raid_disk >= 0 &&
1267 sb->minor_version >= 91)
1268 /* we have nowhere to store the recovery_offset,
1269 * but if it is not below the reshape_position,
1270 * we can piggy-back on that.
1273 if (rdev2->raid_disk < 0 ||
1274 test_bit(Faulty, &rdev2->flags))
1277 desc_nr = rdev2->raid_disk;
1279 desc_nr = next_spare++;
1280 rdev2->desc_nr = desc_nr;
1281 d = &sb->disks[rdev2->desc_nr];
1283 d->number = rdev2->desc_nr;
1284 d->major = MAJOR(rdev2->bdev->bd_dev);
1285 d->minor = MINOR(rdev2->bdev->bd_dev);
1287 d->raid_disk = rdev2->raid_disk;
1289 d->raid_disk = rdev2->desc_nr; /* compatibility */
1290 if (test_bit(Faulty, &rdev2->flags))
1291 d->state = (1<<MD_DISK_FAULTY);
1292 else if (is_active) {
1293 d->state = (1<<MD_DISK_ACTIVE);
1294 if (test_bit(In_sync, &rdev2->flags))
1295 d->state |= (1<<MD_DISK_SYNC);
1303 if (test_bit(WriteMostly, &rdev2->flags))
1304 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1306 /* now set the "removed" and "faulty" bits on any missing devices */
1307 for (i=0 ; i < mddev->raid_disks ; i++) {
1308 mdp_disk_t *d = &sb->disks[i];
1309 if (d->state == 0 && d->number == 0) {
1312 d->state = (1<<MD_DISK_REMOVED);
1313 d->state |= (1<<MD_DISK_FAULTY);
1317 sb->nr_disks = nr_disks;
1318 sb->active_disks = active;
1319 sb->working_disks = working;
1320 sb->failed_disks = failed;
1321 sb->spare_disks = spare;
1323 sb->this_disk = sb->disks[rdev->desc_nr];
1324 sb->sb_csum = calc_sb_csum(sb);
1328 * rdev_size_change for 0.90.0
1330 static unsigned long long
1331 super_90_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
1333 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1334 return 0; /* component must fit device */
1335 if (rdev->mddev->bitmap_info.offset)
1336 return 0; /* can't move bitmap */
1337 rdev->sb_start = calc_dev_sboffset(rdev);
1338 if (!num_sectors || num_sectors > rdev->sb_start)
1339 num_sectors = rdev->sb_start;
1340 /* Limit to 4TB as metadata cannot record more than that.
1341 * 4TB == 2^32 KB, or 2*2^32 sectors.
1343 if (num_sectors >= (2ULL << 32) && rdev->mddev->level >= 1)
1344 num_sectors = (2ULL << 32) - 2;
1345 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1347 md_super_wait(rdev->mddev);
1352 super_90_allow_new_offset(struct md_rdev *rdev, unsigned long long new_offset)
1354 /* non-zero offset changes not possible with v0.90 */
1355 return new_offset == 0;
1359 * version 1 superblock
1362 static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb)
1366 unsigned long long newcsum;
1367 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1368 __le32 *isuper = (__le32*)sb;
1370 disk_csum = sb->sb_csum;
1373 for (; size >= 4; size -= 4)
1374 newcsum += le32_to_cpu(*isuper++);
1377 newcsum += le16_to_cpu(*(__le16*) isuper);
1379 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1380 sb->sb_csum = disk_csum;
1381 return cpu_to_le32(csum);
1384 static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors,
1386 static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
1388 struct mdp_superblock_1 *sb;
1392 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1396 * Calculate the position of the superblock in 512byte sectors.
1397 * It is always aligned to a 4K boundary and
1398 * depeding on minor_version, it can be:
1399 * 0: At least 8K, but less than 12K, from end of device
1400 * 1: At start of device
1401 * 2: 4K from start of device.
1403 switch(minor_version) {
1405 sb_start = i_size_read(rdev->bdev->bd_inode) >> 9;
1407 sb_start &= ~(sector_t)(4*2-1);
1418 rdev->sb_start = sb_start;
1420 /* superblock is rarely larger than 1K, but it can be larger,
1421 * and it is safe to read 4k, so we do that
1423 ret = read_disk_sb(rdev, 4096);
1424 if (ret) return ret;
1427 sb = page_address(rdev->sb_page);
1429 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1430 sb->major_version != cpu_to_le32(1) ||
1431 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1432 le64_to_cpu(sb->super_offset) != rdev->sb_start ||
1433 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1436 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1437 printk("md: invalid superblock checksum on %s\n",
1438 bdevname(rdev->bdev,b));
1441 if (le64_to_cpu(sb->data_size) < 10) {
1442 printk("md: data_size too small on %s\n",
1443 bdevname(rdev->bdev,b));
1448 memcmp(sb->pad3, sb->pad3+1, sizeof(sb->pad3) - sizeof(sb->pad3[1])))
1449 /* Some padding is non-zero, might be a new feature */
1452 rdev->preferred_minor = 0xffff;
1453 rdev->data_offset = le64_to_cpu(sb->data_offset);
1454 rdev->new_data_offset = rdev->data_offset;
1455 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE) &&
1456 (le32_to_cpu(sb->feature_map) & MD_FEATURE_NEW_OFFSET))
1457 rdev->new_data_offset += (s32)le32_to_cpu(sb->new_offset);
1458 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1460 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1461 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1462 if (rdev->sb_size & bmask)
1463 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1466 && rdev->data_offset < sb_start + (rdev->sb_size/512))
1469 && rdev->new_data_offset < sb_start + (rdev->sb_size/512))
1472 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1475 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1477 if (!rdev->bb_page) {
1478 rdev->bb_page = alloc_page(GFP_KERNEL);
1482 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BAD_BLOCKS) &&
1483 rdev->badblocks.count == 0) {
1484 /* need to load the bad block list.
1485 * Currently we limit it to one page.
1491 int sectors = le16_to_cpu(sb->bblog_size);
1492 if (sectors > (PAGE_SIZE / 512))
1494 offset = le32_to_cpu(sb->bblog_offset);
1497 bb_sector = (long long)offset;
1498 if (!sync_page_io(rdev, bb_sector, sectors << 9,
1499 rdev->bb_page, READ, true))
1501 bbp = (u64 *)page_address(rdev->bb_page);
1502 rdev->badblocks.shift = sb->bblog_shift;
1503 for (i = 0 ; i < (sectors << (9-3)) ; i++, bbp++) {
1504 u64 bb = le64_to_cpu(*bbp);
1505 int count = bb & (0x3ff);
1506 u64 sector = bb >> 10;
1507 sector <<= sb->bblog_shift;
1508 count <<= sb->bblog_shift;
1511 if (md_set_badblocks(&rdev->badblocks,
1512 sector, count, 1) == 0)
1515 } else if (sb->bblog_offset != 0)
1516 rdev->badblocks.shift = 0;
1522 struct mdp_superblock_1 *refsb = page_address(refdev->sb_page);
1524 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1525 sb->level != refsb->level ||
1526 sb->layout != refsb->layout ||
1527 sb->chunksize != refsb->chunksize) {
1528 printk(KERN_WARNING "md: %s has strangely different"
1529 " superblock to %s\n",
1530 bdevname(rdev->bdev,b),
1531 bdevname(refdev->bdev,b2));
1534 ev1 = le64_to_cpu(sb->events);
1535 ev2 = le64_to_cpu(refsb->events);
1542 if (minor_version) {
1543 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9);
1544 sectors -= rdev->data_offset;
1546 sectors = rdev->sb_start;
1547 if (sectors < le64_to_cpu(sb->data_size))
1549 rdev->sectors = le64_to_cpu(sb->data_size);
1553 static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev)
1555 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
1556 __u64 ev1 = le64_to_cpu(sb->events);
1558 rdev->raid_disk = -1;
1559 clear_bit(Faulty, &rdev->flags);
1560 clear_bit(In_sync, &rdev->flags);
1561 clear_bit(Bitmap_sync, &rdev->flags);
1562 clear_bit(WriteMostly, &rdev->flags);
1564 if (mddev->raid_disks == 0) {
1565 mddev->major_version = 1;
1566 mddev->patch_version = 0;
1567 mddev->external = 0;
1568 mddev->chunk_sectors = le32_to_cpu(sb->chunksize);
1569 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1570 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1571 mddev->level = le32_to_cpu(sb->level);
1572 mddev->clevel[0] = 0;
1573 mddev->layout = le32_to_cpu(sb->layout);
1574 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1575 mddev->dev_sectors = le64_to_cpu(sb->size);
1576 mddev->events = ev1;
1577 mddev->bitmap_info.offset = 0;
1578 mddev->bitmap_info.space = 0;
1579 /* Default location for bitmap is 1K after superblock
1580 * using 3K - total of 4K
1582 mddev->bitmap_info.default_offset = 1024 >> 9;
1583 mddev->bitmap_info.default_space = (4096-1024) >> 9;
1584 mddev->reshape_backwards = 0;
1586 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1587 memcpy(mddev->uuid, sb->set_uuid, 16);
1589 mddev->max_disks = (4096-256)/2;
1591 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1592 mddev->bitmap_info.file == NULL) {
1593 mddev->bitmap_info.offset =
1594 (__s32)le32_to_cpu(sb->bitmap_offset);
1595 /* Metadata doesn't record how much space is available.
1596 * For 1.0, we assume we can use up to the superblock
1597 * if before, else to 4K beyond superblock.
1598 * For others, assume no change is possible.
1600 if (mddev->minor_version > 0)
1601 mddev->bitmap_info.space = 0;
1602 else if (mddev->bitmap_info.offset > 0)
1603 mddev->bitmap_info.space =
1604 8 - mddev->bitmap_info.offset;
1606 mddev->bitmap_info.space =
1607 -mddev->bitmap_info.offset;
1610 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1611 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1612 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1613 mddev->new_level = le32_to_cpu(sb->new_level);
1614 mddev->new_layout = le32_to_cpu(sb->new_layout);
1615 mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk);
1616 if (mddev->delta_disks < 0 ||
1617 (mddev->delta_disks == 0 &&
1618 (le32_to_cpu(sb->feature_map)
1619 & MD_FEATURE_RESHAPE_BACKWARDS)))
1620 mddev->reshape_backwards = 1;
1622 mddev->reshape_position = MaxSector;
1623 mddev->delta_disks = 0;
1624 mddev->new_level = mddev->level;
1625 mddev->new_layout = mddev->layout;
1626 mddev->new_chunk_sectors = mddev->chunk_sectors;
1629 } else if (mddev->pers == NULL) {
1630 /* Insist of good event counter while assembling, except for
1631 * spares (which don't need an event count) */
1633 if (rdev->desc_nr >= 0 &&
1634 rdev->desc_nr < le32_to_cpu(sb->max_dev) &&
1635 le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < 0xfffe)
1636 if (ev1 < mddev->events)
1638 } else if (mddev->bitmap) {
1639 /* If adding to array with a bitmap, then we can accept an
1640 * older device, but not too old.
1642 if (ev1 < mddev->bitmap->events_cleared)
1644 if (ev1 < mddev->events)
1645 set_bit(Bitmap_sync, &rdev->flags);
1647 if (ev1 < mddev->events)
1648 /* just a hot-add of a new device, leave raid_disk at -1 */
1651 if (mddev->level != LEVEL_MULTIPATH) {
1653 if (rdev->desc_nr < 0 ||
1654 rdev->desc_nr >= le32_to_cpu(sb->max_dev)) {
1658 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1660 case 0xffff: /* spare */
1662 case 0xfffe: /* faulty */
1663 set_bit(Faulty, &rdev->flags);
1666 rdev->saved_raid_disk = role;
1667 if ((le32_to_cpu(sb->feature_map) &
1668 MD_FEATURE_RECOVERY_OFFSET)) {
1669 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1670 if (!(le32_to_cpu(sb->feature_map) &
1671 MD_FEATURE_RECOVERY_BITMAP))
1672 rdev->saved_raid_disk = -1;
1674 set_bit(In_sync, &rdev->flags);
1675 rdev->raid_disk = role;
1678 if (sb->devflags & WriteMostly1)
1679 set_bit(WriteMostly, &rdev->flags);
1680 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_REPLACEMENT)
1681 set_bit(Replacement, &rdev->flags);
1682 } else /* MULTIPATH are always insync */
1683 set_bit(In_sync, &rdev->flags);
1688 static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev)
1690 struct mdp_superblock_1 *sb;
1691 struct md_rdev *rdev2;
1693 /* make rdev->sb match mddev and rdev data. */
1695 sb = page_address(rdev->sb_page);
1697 sb->feature_map = 0;
1699 sb->recovery_offset = cpu_to_le64(0);
1700 memset(sb->pad3, 0, sizeof(sb->pad3));
1702 sb->utime = cpu_to_le64((__u64)mddev->utime);
1703 sb->events = cpu_to_le64(mddev->events);
1705 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1707 sb->resync_offset = cpu_to_le64(0);
1709 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
1711 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
1712 sb->size = cpu_to_le64(mddev->dev_sectors);
1713 sb->chunksize = cpu_to_le32(mddev->chunk_sectors);
1714 sb->level = cpu_to_le32(mddev->level);
1715 sb->layout = cpu_to_le32(mddev->layout);
1717 if (test_bit(WriteMostly, &rdev->flags))
1718 sb->devflags |= WriteMostly1;
1720 sb->devflags &= ~WriteMostly1;
1721 sb->data_offset = cpu_to_le64(rdev->data_offset);
1722 sb->data_size = cpu_to_le64(rdev->sectors);
1724 if (mddev->bitmap && mddev->bitmap_info.file == NULL) {
1725 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset);
1726 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
1729 if (rdev->raid_disk >= 0 &&
1730 !test_bit(In_sync, &rdev->flags)) {
1732 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1733 sb->recovery_offset =
1734 cpu_to_le64(rdev->recovery_offset);
1735 if (rdev->saved_raid_disk >= 0 && mddev->bitmap)
1737 cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP);
1739 if (test_bit(Replacement, &rdev->flags))
1741 cpu_to_le32(MD_FEATURE_REPLACEMENT);
1743 if (mddev->reshape_position != MaxSector) {
1744 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1745 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1746 sb->new_layout = cpu_to_le32(mddev->new_layout);
1747 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1748 sb->new_level = cpu_to_le32(mddev->new_level);
1749 sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors);
1750 if (mddev->delta_disks == 0 &&
1751 mddev->reshape_backwards)
1753 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS);
1754 if (rdev->new_data_offset != rdev->data_offset) {
1756 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET);
1757 sb->new_offset = cpu_to_le32((__u32)(rdev->new_data_offset
1758 - rdev->data_offset));
1762 if (rdev->badblocks.count == 0)
1763 /* Nothing to do for bad blocks*/ ;
1764 else if (sb->bblog_offset == 0)
1765 /* Cannot record bad blocks on this device */
1766 md_error(mddev, rdev);
1768 struct badblocks *bb = &rdev->badblocks;
1769 u64 *bbp = (u64 *)page_address(rdev->bb_page);
1771 sb->feature_map |= cpu_to_le32(MD_FEATURE_BAD_BLOCKS);
1776 seq = read_seqbegin(&bb->lock);
1778 memset(bbp, 0xff, PAGE_SIZE);
1780 for (i = 0 ; i < bb->count ; i++) {
1781 u64 internal_bb = p[i];
1782 u64 store_bb = ((BB_OFFSET(internal_bb) << 10)
1783 | BB_LEN(internal_bb));
1784 bbp[i] = cpu_to_le64(store_bb);
1787 if (read_seqretry(&bb->lock, seq))
1790 bb->sector = (rdev->sb_start +
1791 (int)le32_to_cpu(sb->bblog_offset));
1792 bb->size = le16_to_cpu(sb->bblog_size);
1797 rdev_for_each(rdev2, mddev)
1798 if (rdev2->desc_nr+1 > max_dev)
1799 max_dev = rdev2->desc_nr+1;
1801 if (max_dev > le32_to_cpu(sb->max_dev)) {
1803 sb->max_dev = cpu_to_le32(max_dev);
1804 rdev->sb_size = max_dev * 2 + 256;
1805 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1806 if (rdev->sb_size & bmask)
1807 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1809 max_dev = le32_to_cpu(sb->max_dev);
1811 for (i=0; i<max_dev;i++)
1812 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1814 rdev_for_each(rdev2, mddev) {
1816 if (test_bit(Faulty, &rdev2->flags))
1817 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1818 else if (test_bit(In_sync, &rdev2->flags))
1819 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1820 else if (rdev2->raid_disk >= 0)
1821 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1823 sb->dev_roles[i] = cpu_to_le16(0xffff);
1826 sb->sb_csum = calc_sb_1_csum(sb);
1829 static unsigned long long
1830 super_1_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
1832 struct mdp_superblock_1 *sb;
1833 sector_t max_sectors;
1834 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1835 return 0; /* component must fit device */
1836 if (rdev->data_offset != rdev->new_data_offset)
1837 return 0; /* too confusing */
1838 if (rdev->sb_start < rdev->data_offset) {
1839 /* minor versions 1 and 2; superblock before data */
1840 max_sectors = i_size_read(rdev->bdev->bd_inode) >> 9;
1841 max_sectors -= rdev->data_offset;
1842 if (!num_sectors || num_sectors > max_sectors)
1843 num_sectors = max_sectors;
1844 } else if (rdev->mddev->bitmap_info.offset) {
1845 /* minor version 0 with bitmap we can't move */
1848 /* minor version 0; superblock after data */
1850 sb_start = (i_size_read(rdev->bdev->bd_inode) >> 9) - 8*2;
1851 sb_start &= ~(sector_t)(4*2 - 1);
1852 max_sectors = rdev->sectors + sb_start - rdev->sb_start;
1853 if (!num_sectors || num_sectors > max_sectors)
1854 num_sectors = max_sectors;
1855 rdev->sb_start = sb_start;
1857 sb = page_address(rdev->sb_page);
1858 sb->data_size = cpu_to_le64(num_sectors);
1859 sb->super_offset = rdev->sb_start;
1860 sb->sb_csum = calc_sb_1_csum(sb);
1861 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1863 md_super_wait(rdev->mddev);
1869 super_1_allow_new_offset(struct md_rdev *rdev,
1870 unsigned long long new_offset)
1872 /* All necessary checks on new >= old have been done */
1873 struct bitmap *bitmap;
1874 if (new_offset >= rdev->data_offset)
1877 /* with 1.0 metadata, there is no metadata to tread on
1878 * so we can always move back */
1879 if (rdev->mddev->minor_version == 0)
1882 /* otherwise we must be sure not to step on
1883 * any metadata, so stay:
1884 * 36K beyond start of superblock
1885 * beyond end of badblocks
1886 * beyond write-intent bitmap
1888 if (rdev->sb_start + (32+4)*2 > new_offset)
1890 bitmap = rdev->mddev->bitmap;
1891 if (bitmap && !rdev->mddev->bitmap_info.file &&
1892 rdev->sb_start + rdev->mddev->bitmap_info.offset +
1893 bitmap->storage.file_pages * (PAGE_SIZE>>9) > new_offset)
1895 if (rdev->badblocks.sector + rdev->badblocks.size > new_offset)
1901 static struct super_type super_types[] = {
1904 .owner = THIS_MODULE,
1905 .load_super = super_90_load,
1906 .validate_super = super_90_validate,
1907 .sync_super = super_90_sync,
1908 .rdev_size_change = super_90_rdev_size_change,
1909 .allow_new_offset = super_90_allow_new_offset,
1913 .owner = THIS_MODULE,
1914 .load_super = super_1_load,
1915 .validate_super = super_1_validate,
1916 .sync_super = super_1_sync,
1917 .rdev_size_change = super_1_rdev_size_change,
1918 .allow_new_offset = super_1_allow_new_offset,
1922 static void sync_super(struct mddev *mddev, struct md_rdev *rdev)
1924 if (mddev->sync_super) {
1925 mddev->sync_super(mddev, rdev);
1929 BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types));
1931 super_types[mddev->major_version].sync_super(mddev, rdev);
1934 static int match_mddev_units(struct mddev *mddev1, struct mddev *mddev2)
1936 struct md_rdev *rdev, *rdev2;
1939 rdev_for_each_rcu(rdev, mddev1)
1940 rdev_for_each_rcu(rdev2, mddev2)
1941 if (rdev->bdev->bd_contains ==
1942 rdev2->bdev->bd_contains) {
1950 static LIST_HEAD(pending_raid_disks);
1953 * Try to register data integrity profile for an mddev
1955 * This is called when an array is started and after a disk has been kicked
1956 * from the array. It only succeeds if all working and active component devices
1957 * are integrity capable with matching profiles.
1959 int md_integrity_register(struct mddev *mddev)
1961 struct md_rdev *rdev, *reference = NULL;
1963 if (list_empty(&mddev->disks))
1964 return 0; /* nothing to do */
1965 if (!mddev->gendisk || blk_get_integrity(mddev->gendisk))
1966 return 0; /* shouldn't register, or already is */
1967 rdev_for_each(rdev, mddev) {
1968 /* skip spares and non-functional disks */
1969 if (test_bit(Faulty, &rdev->flags))
1971 if (rdev->raid_disk < 0)
1974 /* Use the first rdev as the reference */
1978 /* does this rdev's profile match the reference profile? */
1979 if (blk_integrity_compare(reference->bdev->bd_disk,
1980 rdev->bdev->bd_disk) < 0)
1983 if (!reference || !bdev_get_integrity(reference->bdev))
1986 * All component devices are integrity capable and have matching
1987 * profiles, register the common profile for the md device.
1989 if (blk_integrity_register(mddev->gendisk,
1990 bdev_get_integrity(reference->bdev)) != 0) {
1991 printk(KERN_ERR "md: failed to register integrity for %s\n",
1995 printk(KERN_NOTICE "md: data integrity enabled on %s\n", mdname(mddev));
1996 if (bioset_integrity_create(mddev->bio_set, BIO_POOL_SIZE)) {
1997 printk(KERN_ERR "md: failed to create integrity pool for %s\n",
2003 EXPORT_SYMBOL(md_integrity_register);
2005 /* Disable data integrity if non-capable/non-matching disk is being added */
2006 void md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev)
2008 struct blk_integrity *bi_rdev;
2009 struct blk_integrity *bi_mddev;
2011 if (!mddev->gendisk)
2014 bi_rdev = bdev_get_integrity(rdev->bdev);
2015 bi_mddev = blk_get_integrity(mddev->gendisk);
2017 if (!bi_mddev) /* nothing to do */
2019 if (rdev->raid_disk < 0) /* skip spares */
2021 if (bi_rdev && blk_integrity_compare(mddev->gendisk,
2022 rdev->bdev->bd_disk) >= 0)
2024 printk(KERN_NOTICE "disabling data integrity on %s\n", mdname(mddev));
2025 blk_integrity_unregister(mddev->gendisk);
2027 EXPORT_SYMBOL(md_integrity_add_rdev);
2029 static int bind_rdev_to_array(struct md_rdev * rdev, struct mddev * mddev)
2031 char b[BDEVNAME_SIZE];
2041 /* prevent duplicates */
2042 if (find_rdev(mddev, rdev->bdev->bd_dev))
2045 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2046 if (rdev->sectors && (mddev->dev_sectors == 0 ||
2047 rdev->sectors < mddev->dev_sectors)) {
2049 /* Cannot change size, so fail
2050 * If mddev->level <= 0, then we don't care
2051 * about aligning sizes (e.g. linear)
2053 if (mddev->level > 0)
2056 mddev->dev_sectors = rdev->sectors;
2059 /* Verify rdev->desc_nr is unique.
2060 * If it is -1, assign a free number, else
2061 * check number is not in use
2063 if (rdev->desc_nr < 0) {
2065 if (mddev->pers) choice = mddev->raid_disks;
2066 while (find_rdev_nr(mddev, choice))
2068 rdev->desc_nr = choice;
2070 if (find_rdev_nr(mddev, rdev->desc_nr))
2073 if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) {
2074 printk(KERN_WARNING "md: %s: array is limited to %d devices\n",
2075 mdname(mddev), mddev->max_disks);
2078 bdevname(rdev->bdev,b);
2079 while ( (s=strchr(b, '/')) != NULL)
2082 rdev->mddev = mddev;
2083 printk(KERN_INFO "md: bind<%s>\n", b);
2085 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
2088 ko = &part_to_dev(rdev->bdev->bd_part)->kobj;
2089 if (sysfs_create_link(&rdev->kobj, ko, "block"))
2090 /* failure here is OK */;
2091 rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state");
2093 list_add_rcu(&rdev->same_set, &mddev->disks);
2094 bd_link_disk_holder(rdev->bdev, mddev->gendisk);
2096 /* May as well allow recovery to be retried once */
2097 mddev->recovery_disabled++;
2102 printk(KERN_WARNING "md: failed to register dev-%s for %s\n",
2107 static void md_delayed_delete(struct work_struct *ws)
2109 struct md_rdev *rdev = container_of(ws, struct md_rdev, del_work);
2110 kobject_del(&rdev->kobj);
2111 kobject_put(&rdev->kobj);
2114 static void unbind_rdev_from_array(struct md_rdev * rdev)
2116 char b[BDEVNAME_SIZE];
2121 bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk);
2122 list_del_rcu(&rdev->same_set);
2123 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
2125 sysfs_remove_link(&rdev->kobj, "block");
2126 sysfs_put(rdev->sysfs_state);
2127 rdev->sysfs_state = NULL;
2128 rdev->badblocks.count = 0;
2129 /* We need to delay this, otherwise we can deadlock when
2130 * writing to 'remove' to "dev/state". We also need
2131 * to delay it due to rcu usage.
2134 INIT_WORK(&rdev->del_work, md_delayed_delete);
2135 kobject_get(&rdev->kobj);
2136 queue_work(md_misc_wq, &rdev->del_work);
2140 * prevent the device from being mounted, repartitioned or
2141 * otherwise reused by a RAID array (or any other kernel
2142 * subsystem), by bd_claiming the device.
2144 static int lock_rdev(struct md_rdev *rdev, dev_t dev, int shared)
2147 struct block_device *bdev;
2148 char b[BDEVNAME_SIZE];
2150 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
2151 shared ? (struct md_rdev *)lock_rdev : rdev);
2153 printk(KERN_ERR "md: could not open %s.\n",
2154 __bdevname(dev, b));
2155 return PTR_ERR(bdev);
2161 static void unlock_rdev(struct md_rdev *rdev)
2163 struct block_device *bdev = rdev->bdev;
2167 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
2170 void md_autodetect_dev(dev_t dev);
2172 static void export_rdev(struct md_rdev * rdev)
2174 char b[BDEVNAME_SIZE];
2175 printk(KERN_INFO "md: export_rdev(%s)\n",
2176 bdevname(rdev->bdev,b));
2179 md_rdev_clear(rdev);
2181 if (test_bit(AutoDetected, &rdev->flags))
2182 md_autodetect_dev(rdev->bdev->bd_dev);
2185 kobject_put(&rdev->kobj);
2188 static void kick_rdev_from_array(struct md_rdev * rdev)
2190 unbind_rdev_from_array(rdev);
2194 static void export_array(struct mddev *mddev)
2196 struct md_rdev *rdev, *tmp;
2198 rdev_for_each_safe(rdev, tmp, mddev) {
2203 kick_rdev_from_array(rdev);
2205 if (!list_empty(&mddev->disks))
2207 mddev->raid_disks = 0;
2208 mddev->major_version = 0;
2211 static void print_desc(mdp_disk_t *desc)
2213 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
2214 desc->major,desc->minor,desc->raid_disk,desc->state);
2217 static void print_sb_90(mdp_super_t *sb)
2222 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
2223 sb->major_version, sb->minor_version, sb->patch_version,
2224 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
2226 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
2227 sb->level, sb->size, sb->nr_disks, sb->raid_disks,
2228 sb->md_minor, sb->layout, sb->chunk_size);
2229 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
2230 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
2231 sb->utime, sb->state, sb->active_disks, sb->working_disks,
2232 sb->failed_disks, sb->spare_disks,
2233 sb->sb_csum, (unsigned long)sb->events_lo);
2236 for (i = 0; i < MD_SB_DISKS; i++) {
2239 desc = sb->disks + i;
2240 if (desc->number || desc->major || desc->minor ||
2241 desc->raid_disk || (desc->state && (desc->state != 4))) {
2242 printk(" D %2d: ", i);
2246 printk(KERN_INFO "md: THIS: ");
2247 print_desc(&sb->this_disk);
2250 static void print_sb_1(struct mdp_superblock_1 *sb)
2254 uuid = sb->set_uuid;
2256 "md: SB: (V:%u) (F:0x%08x) Array-ID:<%pU>\n"
2257 "md: Name: \"%s\" CT:%llu\n",
2258 le32_to_cpu(sb->major_version),
2259 le32_to_cpu(sb->feature_map),
2262 (unsigned long long)le64_to_cpu(sb->ctime)
2263 & MD_SUPERBLOCK_1_TIME_SEC_MASK);
2265 uuid = sb->device_uuid;
2267 "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu"
2269 "md: Dev:%08x UUID: %pU\n"
2270 "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n"
2271 "md: (MaxDev:%u) \n",
2272 le32_to_cpu(sb->level),
2273 (unsigned long long)le64_to_cpu(sb->size),
2274 le32_to_cpu(sb->raid_disks),
2275 le32_to_cpu(sb->layout),
2276 le32_to_cpu(sb->chunksize),
2277 (unsigned long long)le64_to_cpu(sb->data_offset),
2278 (unsigned long long)le64_to_cpu(sb->data_size),
2279 (unsigned long long)le64_to_cpu(sb->super_offset),
2280 (unsigned long long)le64_to_cpu(sb->recovery_offset),
2281 le32_to_cpu(sb->dev_number),
2284 (unsigned long long)le64_to_cpu(sb->utime) & MD_SUPERBLOCK_1_TIME_SEC_MASK,
2285 (unsigned long long)le64_to_cpu(sb->events),
2286 (unsigned long long)le64_to_cpu(sb->resync_offset),
2287 le32_to_cpu(sb->sb_csum),
2288 le32_to_cpu(sb->max_dev)
2292 static void print_rdev(struct md_rdev *rdev, int major_version)
2294 char b[BDEVNAME_SIZE];
2295 printk(KERN_INFO "md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n",
2296 bdevname(rdev->bdev, b), (unsigned long long)rdev->sectors,
2297 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
2299 if (rdev->sb_loaded) {
2300 printk(KERN_INFO "md: rdev superblock (MJ:%d):\n", major_version);
2301 switch (major_version) {
2303 print_sb_90(page_address(rdev->sb_page));
2306 print_sb_1(page_address(rdev->sb_page));
2310 printk(KERN_INFO "md: no rdev superblock!\n");
2313 static void md_print_devices(void)
2315 struct list_head *tmp;
2316 struct md_rdev *rdev;
2317 struct mddev *mddev;
2318 char b[BDEVNAME_SIZE];
2321 printk("md: **********************************\n");
2322 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
2323 printk("md: **********************************\n");
2324 for_each_mddev(mddev, tmp) {
2327 bitmap_print_sb(mddev->bitmap);
2329 printk("%s: ", mdname(mddev));
2330 rdev_for_each(rdev, mddev)
2331 printk("<%s>", bdevname(rdev->bdev,b));
2334 rdev_for_each(rdev, mddev)
2335 print_rdev(rdev, mddev->major_version);
2337 printk("md: **********************************\n");
2342 static void sync_sbs(struct mddev * mddev, int nospares)
2344 /* Update each superblock (in-memory image), but
2345 * if we are allowed to, skip spares which already
2346 * have the right event counter, or have one earlier
2347 * (which would mean they aren't being marked as dirty
2348 * with the rest of the array)
2350 struct md_rdev *rdev;
2351 rdev_for_each(rdev, mddev) {
2352 if (rdev->sb_events == mddev->events ||
2354 rdev->raid_disk < 0 &&
2355 rdev->sb_events+1 == mddev->events)) {
2356 /* Don't update this superblock */
2357 rdev->sb_loaded = 2;
2359 sync_super(mddev, rdev);
2360 rdev->sb_loaded = 1;
2365 static void md_update_sb(struct mddev * mddev, int force_change)
2367 struct md_rdev *rdev;
2370 int any_badblocks_changed = 0;
2374 set_bit(MD_CHANGE_DEVS, &mddev->flags);
2378 /* First make sure individual recovery_offsets are correct */
2379 rdev_for_each(rdev, mddev) {
2380 if (rdev->raid_disk >= 0 &&
2381 mddev->delta_disks >= 0 &&
2382 !test_bit(In_sync, &rdev->flags) &&
2383 mddev->curr_resync_completed > rdev->recovery_offset)
2384 rdev->recovery_offset = mddev->curr_resync_completed;
2387 if (!mddev->persistent) {
2388 clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
2389 clear_bit(MD_CHANGE_DEVS, &mddev->flags);
2390 if (!mddev->external) {
2391 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2392 rdev_for_each(rdev, mddev) {
2393 if (rdev->badblocks.changed) {
2394 rdev->badblocks.changed = 0;
2395 md_ack_all_badblocks(&rdev->badblocks);
2396 md_error(mddev, rdev);
2398 clear_bit(Blocked, &rdev->flags);
2399 clear_bit(BlockedBadBlocks, &rdev->flags);
2400 wake_up(&rdev->blocked_wait);
2403 wake_up(&mddev->sb_wait);
2407 spin_lock_irq(&mddev->write_lock);
2409 mddev->utime = get_seconds();
2411 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
2413 if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags))
2414 /* just a clean<-> dirty transition, possibly leave spares alone,
2415 * though if events isn't the right even/odd, we will have to do
2421 if (mddev->degraded)
2422 /* If the array is degraded, then skipping spares is both
2423 * dangerous and fairly pointless.
2424 * Dangerous because a device that was removed from the array
2425 * might have a event_count that still looks up-to-date,
2426 * so it can be re-added without a resync.
2427 * Pointless because if there are any spares to skip,
2428 * then a recovery will happen and soon that array won't
2429 * be degraded any more and the spare can go back to sleep then.
2433 sync_req = mddev->in_sync;
2435 /* If this is just a dirty<->clean transition, and the array is clean
2436 * and 'events' is odd, we can roll back to the previous clean state */
2438 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
2439 && mddev->can_decrease_events
2440 && mddev->events != 1) {
2442 mddev->can_decrease_events = 0;
2444 /* otherwise we have to go forward and ... */
2446 mddev->can_decrease_events = nospares;
2449 if (!mddev->events) {
2451 * oops, this 64-bit counter should never wrap.
2452 * Either we are in around ~1 trillion A.C., assuming
2453 * 1 reboot per second, or we have a bug:
2459 rdev_for_each(rdev, mddev) {
2460 if (rdev->badblocks.changed)
2461 any_badblocks_changed++;
2462 if (test_bit(Faulty, &rdev->flags))
2463 set_bit(FaultRecorded, &rdev->flags);
2466 sync_sbs(mddev, nospares);
2467 spin_unlock_irq(&mddev->write_lock);
2469 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2470 mdname(mddev), mddev->in_sync);
2472 bitmap_update_sb(mddev->bitmap);
2473 rdev_for_each(rdev, mddev) {
2474 char b[BDEVNAME_SIZE];
2476 if (rdev->sb_loaded != 1)
2477 continue; /* no noise on spare devices */
2479 if (!test_bit(Faulty, &rdev->flags)) {
2480 md_super_write(mddev,rdev,
2481 rdev->sb_start, rdev->sb_size,
2483 pr_debug("md: (write) %s's sb offset: %llu\n",
2484 bdevname(rdev->bdev, b),
2485 (unsigned long long)rdev->sb_start);
2486 rdev->sb_events = mddev->events;
2487 if (rdev->badblocks.size) {
2488 md_super_write(mddev, rdev,
2489 rdev->badblocks.sector,
2490 rdev->badblocks.size << 9,
2492 rdev->badblocks.size = 0;
2496 pr_debug("md: %s (skipping faulty)\n",
2497 bdevname(rdev->bdev, b));
2499 if (mddev->level == LEVEL_MULTIPATH)
2500 /* only need to write one superblock... */
2503 md_super_wait(mddev);
2504 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2506 spin_lock_irq(&mddev->write_lock);
2507 if (mddev->in_sync != sync_req ||
2508 test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
2509 /* have to write it out again */
2510 spin_unlock_irq(&mddev->write_lock);
2513 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2514 spin_unlock_irq(&mddev->write_lock);
2515 wake_up(&mddev->sb_wait);
2516 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
2517 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
2519 rdev_for_each(rdev, mddev) {
2520 if (test_and_clear_bit(FaultRecorded, &rdev->flags))
2521 clear_bit(Blocked, &rdev->flags);
2523 if (any_badblocks_changed)
2524 md_ack_all_badblocks(&rdev->badblocks);
2525 clear_bit(BlockedBadBlocks, &rdev->flags);
2526 wake_up(&rdev->blocked_wait);
2530 /* words written to sysfs files may, or may not, be \n terminated.
2531 * We want to accept with case. For this we use cmd_match.
2533 static int cmd_match(const char *cmd, const char *str)
2535 /* See if cmd, written into a sysfs file, matches
2536 * str. They must either be the same, or cmd can
2537 * have a trailing newline
2539 while (*cmd && *str && *cmd == *str) {
2550 struct rdev_sysfs_entry {
2551 struct attribute attr;
2552 ssize_t (*show)(struct md_rdev *, char *);
2553 ssize_t (*store)(struct md_rdev *, const char *, size_t);
2557 state_show(struct md_rdev *rdev, char *page)
2562 if (test_bit(Faulty, &rdev->flags) ||
2563 rdev->badblocks.unacked_exist) {
2564 len+= sprintf(page+len, "%sfaulty",sep);
2567 if (test_bit(In_sync, &rdev->flags)) {
2568 len += sprintf(page+len, "%sin_sync",sep);
2571 if (test_bit(WriteMostly, &rdev->flags)) {
2572 len += sprintf(page+len, "%swrite_mostly",sep);
2575 if (test_bit(Blocked, &rdev->flags) ||
2576 (rdev->badblocks.unacked_exist
2577 && !test_bit(Faulty, &rdev->flags))) {
2578 len += sprintf(page+len, "%sblocked", sep);
2581 if (!test_bit(Faulty, &rdev->flags) &&
2582 !test_bit(In_sync, &rdev->flags)) {
2583 len += sprintf(page+len, "%sspare", sep);
2586 if (test_bit(WriteErrorSeen, &rdev->flags)) {
2587 len += sprintf(page+len, "%swrite_error", sep);
2590 if (test_bit(WantReplacement, &rdev->flags)) {
2591 len += sprintf(page+len, "%swant_replacement", sep);
2594 if (test_bit(Replacement, &rdev->flags)) {
2595 len += sprintf(page+len, "%sreplacement", sep);
2599 return len+sprintf(page+len, "\n");
2603 state_store(struct md_rdev *rdev, const char *buf, size_t len)
2606 * faulty - simulates an error
2607 * remove - disconnects the device
2608 * writemostly - sets write_mostly
2609 * -writemostly - clears write_mostly
2610 * blocked - sets the Blocked flags
2611 * -blocked - clears the Blocked and possibly simulates an error
2612 * insync - sets Insync providing device isn't active
2613 * -insync - clear Insync for a device with a slot assigned,
2614 * so that it gets rebuilt based on bitmap
2615 * write_error - sets WriteErrorSeen
2616 * -write_error - clears WriteErrorSeen
2619 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
2620 md_error(rdev->mddev, rdev);
2621 if (test_bit(Faulty, &rdev->flags))
2625 } else if (cmd_match(buf, "remove")) {
2626 if (rdev->raid_disk >= 0)
2629 struct mddev *mddev = rdev->mddev;
2630 kick_rdev_from_array(rdev);
2632 md_update_sb(mddev, 1);
2633 md_new_event(mddev);
2636 } else if (cmd_match(buf, "writemostly")) {
2637 set_bit(WriteMostly, &rdev->flags);
2639 } else if (cmd_match(buf, "-writemostly")) {
2640 clear_bit(WriteMostly, &rdev->flags);
2642 } else if (cmd_match(buf, "blocked")) {
2643 set_bit(Blocked, &rdev->flags);
2645 } else if (cmd_match(buf, "-blocked")) {
2646 if (!test_bit(Faulty, &rdev->flags) &&
2647 rdev->badblocks.unacked_exist) {
2648 /* metadata handler doesn't understand badblocks,
2649 * so we need to fail the device
2651 md_error(rdev->mddev, rdev);
2653 clear_bit(Blocked, &rdev->flags);
2654 clear_bit(BlockedBadBlocks, &rdev->flags);
2655 wake_up(&rdev->blocked_wait);
2656 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2657 md_wakeup_thread(rdev->mddev->thread);
2660 } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) {
2661 set_bit(In_sync, &rdev->flags);
2663 } else if (cmd_match(buf, "-insync") && rdev->raid_disk >= 0) {
2664 clear_bit(In_sync, &rdev->flags);
2665 rdev->saved_raid_disk = rdev->raid_disk;
2666 rdev->raid_disk = -1;
2668 } else if (cmd_match(buf, "write_error")) {
2669 set_bit(WriteErrorSeen, &rdev->flags);
2671 } else if (cmd_match(buf, "-write_error")) {
2672 clear_bit(WriteErrorSeen, &rdev->flags);
2674 } else if (cmd_match(buf, "want_replacement")) {
2675 /* Any non-spare device that is not a replacement can
2676 * become want_replacement at any time, but we then need to
2677 * check if recovery is needed.
2679 if (rdev->raid_disk >= 0 &&
2680 !test_bit(Replacement, &rdev->flags))
2681 set_bit(WantReplacement, &rdev->flags);
2682 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2683 md_wakeup_thread(rdev->mddev->thread);
2685 } else if (cmd_match(buf, "-want_replacement")) {
2686 /* Clearing 'want_replacement' is always allowed.
2687 * Once replacements starts it is too late though.
2690 clear_bit(WantReplacement, &rdev->flags);
2691 } else if (cmd_match(buf, "replacement")) {
2692 /* Can only set a device as a replacement when array has not
2693 * yet been started. Once running, replacement is automatic
2694 * from spares, or by assigning 'slot'.
2696 if (rdev->mddev->pers)
2699 set_bit(Replacement, &rdev->flags);
2702 } else if (cmd_match(buf, "-replacement")) {
2703 /* Similarly, can only clear Replacement before start */
2704 if (rdev->mddev->pers)
2707 clear_bit(Replacement, &rdev->flags);
2712 sysfs_notify_dirent_safe(rdev->sysfs_state);
2713 return err ? err : len;
2715 static struct rdev_sysfs_entry rdev_state =
2716 __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store);
2719 errors_show(struct md_rdev *rdev, char *page)
2721 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
2725 errors_store(struct md_rdev *rdev, const char *buf, size_t len)
2728 unsigned long n = simple_strtoul(buf, &e, 10);
2729 if (*buf && (*e == 0 || *e == '\n')) {
2730 atomic_set(&rdev->corrected_errors, n);
2735 static struct rdev_sysfs_entry rdev_errors =
2736 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
2739 slot_show(struct md_rdev *rdev, char *page)
2741 if (rdev->raid_disk < 0)
2742 return sprintf(page, "none\n");
2744 return sprintf(page, "%d\n", rdev->raid_disk);
2748 slot_store(struct md_rdev *rdev, const char *buf, size_t len)
2752 int slot = simple_strtoul(buf, &e, 10);
2753 if (strncmp(buf, "none", 4)==0)
2755 else if (e==buf || (*e && *e!= '\n'))
2757 if (rdev->mddev->pers && slot == -1) {
2758 /* Setting 'slot' on an active array requires also
2759 * updating the 'rd%d' link, and communicating
2760 * with the personality with ->hot_*_disk.
2761 * For now we only support removing
2762 * failed/spare devices. This normally happens automatically,
2763 * but not when the metadata is externally managed.
2765 if (rdev->raid_disk == -1)
2767 /* personality does all needed checks */
2768 if (rdev->mddev->pers->hot_remove_disk == NULL)
2770 clear_bit(Blocked, &rdev->flags);
2771 remove_and_add_spares(rdev->mddev, rdev);
2772 if (rdev->raid_disk >= 0)
2774 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2775 md_wakeup_thread(rdev->mddev->thread);
2776 } else if (rdev->mddev->pers) {
2777 /* Activating a spare .. or possibly reactivating
2778 * if we ever get bitmaps working here.
2781 if (rdev->raid_disk != -1)
2784 if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery))
2787 if (rdev->mddev->pers->hot_add_disk == NULL)
2790 if (slot >= rdev->mddev->raid_disks &&
2791 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
2794 rdev->raid_disk = slot;
2795 if (test_bit(In_sync, &rdev->flags))
2796 rdev->saved_raid_disk = slot;
2798 rdev->saved_raid_disk = -1;
2799 clear_bit(In_sync, &rdev->flags);
2800 clear_bit(Bitmap_sync, &rdev->flags);
2801 err = rdev->mddev->pers->
2802 hot_add_disk(rdev->mddev, rdev);
2804 rdev->raid_disk = -1;
2807 sysfs_notify_dirent_safe(rdev->sysfs_state);
2808 if (sysfs_link_rdev(rdev->mddev, rdev))
2809 /* failure here is OK */;
2810 /* don't wakeup anyone, leave that to userspace. */
2812 if (slot >= rdev->mddev->raid_disks &&
2813 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
2815 rdev->raid_disk = slot;
2816 /* assume it is working */
2817 clear_bit(Faulty, &rdev->flags);
2818 clear_bit(WriteMostly, &rdev->flags);
2819 set_bit(In_sync, &rdev->flags);
2820 sysfs_notify_dirent_safe(rdev->sysfs_state);
2826 static struct rdev_sysfs_entry rdev_slot =
2827 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
2830 offset_show(struct md_rdev *rdev, char *page)
2832 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
2836 offset_store(struct md_rdev *rdev, const char *buf, size_t len)
2838 unsigned long long offset;
2839 if (kstrtoull(buf, 10, &offset) < 0)
2841 if (rdev->mddev->pers && rdev->raid_disk >= 0)
2843 if (rdev->sectors && rdev->mddev->external)
2844 /* Must set offset before size, so overlap checks
2847 rdev->data_offset = offset;
2848 rdev->new_data_offset = offset;
2852 static struct rdev_sysfs_entry rdev_offset =
2853 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
2855 static ssize_t new_offset_show(struct md_rdev *rdev, char *page)
2857 return sprintf(page, "%llu\n",
2858 (unsigned long long)rdev->new_data_offset);
2861 static ssize_t new_offset_store(struct md_rdev *rdev,
2862 const char *buf, size_t len)
2864 unsigned long long new_offset;
2865 struct mddev *mddev = rdev->mddev;
2867 if (kstrtoull(buf, 10, &new_offset) < 0)
2870 if (mddev->sync_thread)
2872 if (new_offset == rdev->data_offset)
2873 /* reset is always permitted */
2875 else if (new_offset > rdev->data_offset) {
2876 /* must not push array size beyond rdev_sectors */
2877 if (new_offset - rdev->data_offset
2878 + mddev->dev_sectors > rdev->sectors)
2881 /* Metadata worries about other space details. */
2883 /* decreasing the offset is inconsistent with a backwards
2886 if (new_offset < rdev->data_offset &&
2887 mddev->reshape_backwards)
2889 /* Increasing offset is inconsistent with forwards
2890 * reshape. reshape_direction should be set to
2891 * 'backwards' first.
2893 if (new_offset > rdev->data_offset &&
2894 !mddev->reshape_backwards)
2897 if (mddev->pers && mddev->persistent &&
2898 !super_types[mddev->major_version]
2899 .allow_new_offset(rdev, new_offset))
2901 rdev->new_data_offset = new_offset;
2902 if (new_offset > rdev->data_offset)
2903 mddev->reshape_backwards = 1;
2904 else if (new_offset < rdev->data_offset)
2905 mddev->reshape_backwards = 0;
2909 static struct rdev_sysfs_entry rdev_new_offset =
2910 __ATTR(new_offset, S_IRUGO|S_IWUSR, new_offset_show, new_offset_store);
2913 rdev_size_show(struct md_rdev *rdev, char *page)
2915 return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2);
2918 static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
2920 /* check if two start/length pairs overlap */
2928 static int strict_blocks_to_sectors(const char *buf, sector_t *sectors)
2930 unsigned long long blocks;
2933 if (kstrtoull(buf, 10, &blocks) < 0)
2936 if (blocks & 1ULL << (8 * sizeof(blocks) - 1))
2937 return -EINVAL; /* sector conversion overflow */
2940 if (new != blocks * 2)
2941 return -EINVAL; /* unsigned long long to sector_t overflow */
2948 rdev_size_store(struct md_rdev *rdev, const char *buf, size_t len)
2950 struct mddev *my_mddev = rdev->mddev;
2951 sector_t oldsectors = rdev->sectors;
2954 if (strict_blocks_to_sectors(buf, §ors) < 0)
2956 if (rdev->data_offset != rdev->new_data_offset)
2957 return -EINVAL; /* too confusing */
2958 if (my_mddev->pers && rdev->raid_disk >= 0) {
2959 if (my_mddev->persistent) {
2960 sectors = super_types[my_mddev->major_version].
2961 rdev_size_change(rdev, sectors);
2964 } else if (!sectors)
2965 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) -
2967 if (!my_mddev->pers->resize)
2968 /* Cannot change size for RAID0 or Linear etc */
2971 if (sectors < my_mddev->dev_sectors)
2972 return -EINVAL; /* component must fit device */
2974 rdev->sectors = sectors;
2975 if (sectors > oldsectors && my_mddev->external) {
2976 /* need to check that all other rdevs with the same ->bdev
2977 * do not overlap. We need to unlock the mddev to avoid
2978 * a deadlock. We have already changed rdev->sectors, and if
2979 * we have to change it back, we will have the lock again.
2981 struct mddev *mddev;
2983 struct list_head *tmp;
2985 mddev_unlock(my_mddev);
2986 for_each_mddev(mddev, tmp) {
2987 struct md_rdev *rdev2;
2989 mddev_lock_nointr(mddev);
2990 rdev_for_each(rdev2, mddev)
2991 if (rdev->bdev == rdev2->bdev &&
2993 overlaps(rdev->data_offset, rdev->sectors,
2999 mddev_unlock(mddev);
3005 mddev_lock_nointr(my_mddev);
3007 /* Someone else could have slipped in a size
3008 * change here, but doing so is just silly.
3009 * We put oldsectors back because we *know* it is
3010 * safe, and trust userspace not to race with
3013 rdev->sectors = oldsectors;
3020 static struct rdev_sysfs_entry rdev_size =
3021 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
3024 static ssize_t recovery_start_show(struct md_rdev *rdev, char *page)
3026 unsigned long long recovery_start = rdev->recovery_offset;
3028 if (test_bit(In_sync, &rdev->flags) ||
3029 recovery_start == MaxSector)
3030 return sprintf(page, "none\n");
3032 return sprintf(page, "%llu\n", recovery_start);
3035 static ssize_t recovery_start_store(struct md_rdev *rdev, const char *buf, size_t len)
3037 unsigned long long recovery_start;
3039 if (cmd_match(buf, "none"))
3040 recovery_start = MaxSector;
3041 else if (kstrtoull(buf, 10, &recovery_start))
3044 if (rdev->mddev->pers &&
3045 rdev->raid_disk >= 0)
3048 rdev->recovery_offset = recovery_start;
3049 if (recovery_start == MaxSector)
3050 set_bit(In_sync, &rdev->flags);
3052 clear_bit(In_sync, &rdev->flags);
3056 static struct rdev_sysfs_entry rdev_recovery_start =
3057 __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store);
3061 badblocks_show(struct badblocks *bb, char *page, int unack);
3063 badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack);
3065 static ssize_t bb_show(struct md_rdev *rdev, char *page)
3067 return badblocks_show(&rdev->badblocks, page, 0);
3069 static ssize_t bb_store(struct md_rdev *rdev, const char *page, size_t len)
3071 int rv = badblocks_store(&rdev->badblocks, page, len, 0);
3072 /* Maybe that ack was all we needed */
3073 if (test_and_clear_bit(BlockedBadBlocks, &rdev->flags))
3074 wake_up(&rdev->blocked_wait);
3077 static struct rdev_sysfs_entry rdev_bad_blocks =
3078 __ATTR(bad_blocks, S_IRUGO|S_IWUSR, bb_show, bb_store);
3081 static ssize_t ubb_show(struct md_rdev *rdev, char *page)
3083 return badblocks_show(&rdev->badblocks, page, 1);
3085 static ssize_t ubb_store(struct md_rdev *rdev, const char *page, size_t len)
3087 return badblocks_store(&rdev->badblocks, page, len, 1);
3089 static struct rdev_sysfs_entry rdev_unack_bad_blocks =
3090 __ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store);
3092 static struct attribute *rdev_default_attrs[] = {
3097 &rdev_new_offset.attr,
3099 &rdev_recovery_start.attr,
3100 &rdev_bad_blocks.attr,
3101 &rdev_unack_bad_blocks.attr,
3105 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
3107 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3108 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3109 struct mddev *mddev = rdev->mddev;
3115 rv = mddev ? mddev_lock(mddev) : -EBUSY;
3117 if (rdev->mddev == NULL)
3120 rv = entry->show(rdev, page);
3121 mddev_unlock(mddev);
3127 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
3128 const char *page, size_t length)
3130 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3131 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3133 struct mddev *mddev = rdev->mddev;
3137 if (!capable(CAP_SYS_ADMIN))
3139 rv = mddev ? mddev_lock(mddev): -EBUSY;
3141 if (rdev->mddev == NULL)
3144 rv = entry->store(rdev, page, length);
3145 mddev_unlock(mddev);
3150 static void rdev_free(struct kobject *ko)
3152 struct md_rdev *rdev = container_of(ko, struct md_rdev, kobj);
3155 static const struct sysfs_ops rdev_sysfs_ops = {
3156 .show = rdev_attr_show,
3157 .store = rdev_attr_store,
3159 static struct kobj_type rdev_ktype = {
3160 .release = rdev_free,
3161 .sysfs_ops = &rdev_sysfs_ops,
3162 .default_attrs = rdev_default_attrs,
3165 int md_rdev_init(struct md_rdev *rdev)
3168 rdev->saved_raid_disk = -1;
3169 rdev->raid_disk = -1;
3171 rdev->data_offset = 0;
3172 rdev->new_data_offset = 0;
3173 rdev->sb_events = 0;
3174 rdev->last_read_error.tv_sec = 0;
3175 rdev->last_read_error.tv_nsec = 0;
3176 rdev->sb_loaded = 0;
3177 rdev->bb_page = NULL;
3178 atomic_set(&rdev->nr_pending, 0);
3179 atomic_set(&rdev->read_errors, 0);
3180 atomic_set(&rdev->corrected_errors, 0);
3182 INIT_LIST_HEAD(&rdev->same_set);
3183 init_waitqueue_head(&rdev->blocked_wait);
3185 /* Add space to store bad block list.
3186 * This reserves the space even on arrays where it cannot
3187 * be used - I wonder if that matters
3189 rdev->badblocks.count = 0;
3190 rdev->badblocks.shift = -1; /* disabled until explicitly enabled */
3191 rdev->badblocks.page = kmalloc(PAGE_SIZE, GFP_KERNEL);
3192 seqlock_init(&rdev->badblocks.lock);
3193 if (rdev->badblocks.page == NULL)
3198 EXPORT_SYMBOL_GPL(md_rdev_init);
3200 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3202 * mark the device faulty if:
3204 * - the device is nonexistent (zero size)
3205 * - the device has no valid superblock
3207 * a faulty rdev _never_ has rdev->sb set.
3209 static struct md_rdev *md_import_device(dev_t newdev, int super_format, int super_minor)
3211 char b[BDEVNAME_SIZE];
3213 struct md_rdev *rdev;
3216 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
3218 printk(KERN_ERR "md: could not alloc mem for new device!\n");
3219 return ERR_PTR(-ENOMEM);
3222 err = md_rdev_init(rdev);
3225 err = alloc_disk_sb(rdev);
3229 err = lock_rdev(rdev, newdev, super_format == -2);
3233 kobject_init(&rdev->kobj, &rdev_ktype);
3235 size = i_size_read(rdev->bdev->bd_inode) >> BLOCK_SIZE_BITS;
3238 "md: %s has zero or unknown size, marking faulty!\n",
3239 bdevname(rdev->bdev,b));
3244 if (super_format >= 0) {
3245 err = super_types[super_format].
3246 load_super(rdev, NULL, super_minor);
3247 if (err == -EINVAL) {
3249 "md: %s does not have a valid v%d.%d "
3250 "superblock, not importing!\n",
3251 bdevname(rdev->bdev,b),
3252 super_format, super_minor);
3257 "md: could not read %s's sb, not importing!\n",
3258 bdevname(rdev->bdev,b));
3268 md_rdev_clear(rdev);
3270 return ERR_PTR(err);
3274 * Check a full RAID array for plausibility
3278 static void analyze_sbs(struct mddev * mddev)
3281 struct md_rdev *rdev, *freshest, *tmp;
3282 char b[BDEVNAME_SIZE];
3285 rdev_for_each_safe(rdev, tmp, mddev)
3286 switch (super_types[mddev->major_version].
3287 load_super(rdev, freshest, mddev->minor_version)) {
3295 "md: fatal superblock inconsistency in %s"
3296 " -- removing from array\n",
3297 bdevname(rdev->bdev,b));
3298 kick_rdev_from_array(rdev);
3302 super_types[mddev->major_version].
3303 validate_super(mddev, freshest);
3306 rdev_for_each_safe(rdev, tmp, mddev) {
3307 if (mddev->max_disks &&
3308 (rdev->desc_nr >= mddev->max_disks ||
3309 i > mddev->max_disks)) {
3311 "md: %s: %s: only %d devices permitted\n",
3312 mdname(mddev), bdevname(rdev->bdev, b),
3314 kick_rdev_from_array(rdev);
3317 if (rdev != freshest)
3318 if (super_types[mddev->major_version].
3319 validate_super(mddev, rdev)) {
3320 printk(KERN_WARNING "md: kicking non-fresh %s"
3322 bdevname(rdev->bdev,b));
3323 kick_rdev_from_array(rdev);
3326 if (mddev->level == LEVEL_MULTIPATH) {
3327 rdev->desc_nr = i++;
3328 rdev->raid_disk = rdev->desc_nr;
3329 set_bit(In_sync, &rdev->flags);
3330 } else if (rdev->raid_disk >= (mddev->raid_disks - min(0, mddev->delta_disks))) {
3331 rdev->raid_disk = -1;
3332 clear_bit(In_sync, &rdev->flags);
3337 /* Read a fixed-point number.
3338 * Numbers in sysfs attributes should be in "standard" units where
3339 * possible, so time should be in seconds.
3340 * However we internally use a a much smaller unit such as
3341 * milliseconds or jiffies.
3342 * This function takes a decimal number with a possible fractional
3343 * component, and produces an integer which is the result of
3344 * multiplying that number by 10^'scale'.
3345 * all without any floating-point arithmetic.
3347 int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale)
3349 unsigned long result = 0;
3351 while (isdigit(*cp) || (*cp == '.' && decimals < 0)) {
3354 else if (decimals < scale) {
3357 result = result * 10 + value;
3369 while (decimals < scale) {
3378 static void md_safemode_timeout(unsigned long data);
3381 safe_delay_show(struct mddev *mddev, char *page)
3383 int msec = (mddev->safemode_delay*1000)/HZ;
3384 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
3387 safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len)
3391 if (strict_strtoul_scaled(cbuf, &msec, 3) < 0)
3394 mddev->safemode_delay = 0;
3396 unsigned long old_delay = mddev->safemode_delay;
3397 mddev->safemode_delay = (msec*HZ)/1000;
3398 if (mddev->safemode_delay == 0)
3399 mddev->safemode_delay = 1;
3400 if (mddev->safemode_delay < old_delay || old_delay == 0)
3401 md_safemode_timeout((unsigned long)mddev);
3405 static struct md_sysfs_entry md_safe_delay =
3406 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
3409 level_show(struct mddev *mddev, char *page)
3411 struct md_personality *p = mddev->pers;
3413 return sprintf(page, "%s\n", p->name);
3414 else if (mddev->clevel[0])
3415 return sprintf(page, "%s\n", mddev->clevel);
3416 else if (mddev->level != LEVEL_NONE)
3417 return sprintf(page, "%d\n", mddev->level);
3423 level_store(struct mddev *mddev, const char *buf, size_t len)
3427 struct md_personality *pers;
3430 struct md_rdev *rdev;
3432 if (mddev->pers == NULL) {
3435 if (len >= sizeof(mddev->clevel))
3437 strncpy(mddev->clevel, buf, len);
3438 if (mddev->clevel[len-1] == '\n')
3440 mddev->clevel[len] = 0;
3441 mddev->level = LEVEL_NONE;
3447 /* request to change the personality. Need to ensure:
3448 * - array is not engaged in resync/recovery/reshape
3449 * - old personality can be suspended
3450 * - new personality will access other array.
3453 if (mddev->sync_thread ||
3454 mddev->reshape_position != MaxSector ||
3455 mddev->sysfs_active)
3458 if (!mddev->pers->quiesce) {
3459 printk(KERN_WARNING "md: %s: %s does not support online personality change\n",
3460 mdname(mddev), mddev->pers->name);
3464 /* Now find the new personality */
3465 if (len == 0 || len >= sizeof(clevel))
3467 strncpy(clevel, buf, len);
3468 if (clevel[len-1] == '\n')
3471 if (kstrtol(clevel, 10, &level))
3474 if (request_module("md-%s", clevel) != 0)
3475 request_module("md-level-%s", clevel);
3476 spin_lock(&pers_lock);
3477 pers = find_pers(level, clevel);
3478 if (!pers || !try_module_get(pers->owner)) {
3479 spin_unlock(&pers_lock);
3480 printk(KERN_WARNING "md: personality %s not loaded\n", clevel);
3483 spin_unlock(&pers_lock);
3485 if (pers == mddev->pers) {
3486 /* Nothing to do! */
3487 module_put(pers->owner);
3490 if (!pers->takeover) {
3491 module_put(pers->owner);
3492 printk(KERN_WARNING "md: %s: %s does not support personality takeover\n",
3493 mdname(mddev), clevel);
3497 rdev_for_each(rdev, mddev)
3498 rdev->new_raid_disk = rdev->raid_disk;
3500 /* ->takeover must set new_* and/or delta_disks
3501 * if it succeeds, and may set them when it fails.
3503 priv = pers->takeover(mddev);
3505 mddev->new_level = mddev->level;
3506 mddev->new_layout = mddev->layout;
3507 mddev->new_chunk_sectors = mddev->chunk_sectors;
3508 mddev->raid_disks -= mddev->delta_disks;
3509 mddev->delta_disks = 0;
3510 mddev->reshape_backwards = 0;
3511 module_put(pers->owner);
3512 printk(KERN_WARNING "md: %s: %s would not accept array\n",
3513 mdname(mddev), clevel);
3514 return PTR_ERR(priv);
3517 /* Looks like we have a winner */
3518 mddev_suspend(mddev);
3519 mddev->pers->stop(mddev);
3521 if (mddev->pers->sync_request == NULL &&
3522 pers->sync_request != NULL) {
3523 /* need to add the md_redundancy_group */
3524 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
3526 "md: cannot register extra attributes for %s\n",
3528 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action");
3530 if (mddev->pers->sync_request != NULL &&
3531 pers->sync_request == NULL) {
3532 /* need to remove the md_redundancy_group */
3533 if (mddev->to_remove == NULL)
3534 mddev->to_remove = &md_redundancy_group;
3537 if (mddev->pers->sync_request == NULL &&
3539 /* We are converting from a no-redundancy array
3540 * to a redundancy array and metadata is managed
3541 * externally so we need to be sure that writes
3542 * won't block due to a need to transition
3544 * until external management is started.
3547 mddev->safemode_delay = 0;
3548 mddev->safemode = 0;
3551 rdev_for_each(rdev, mddev) {
3552 if (rdev->raid_disk < 0)
3554 if (rdev->new_raid_disk >= mddev->raid_disks)
3555 rdev->new_raid_disk = -1;
3556 if (rdev->new_raid_disk == rdev->raid_disk)
3558 sysfs_unlink_rdev(mddev, rdev);
3560 rdev_for_each(rdev, mddev) {
3561 if (rdev->raid_disk < 0)
3563 if (rdev->new_raid_disk == rdev->raid_disk)
3565 rdev->raid_disk = rdev->new_raid_disk;
3566 if (rdev->raid_disk < 0)
3567 clear_bit(In_sync, &rdev->flags);
3569 if (sysfs_link_rdev(mddev, rdev))
3570 printk(KERN_WARNING "md: cannot register rd%d"
3571 " for %s after level change\n",
3572 rdev->raid_disk, mdname(mddev));
3576 module_put(mddev->pers->owner);
3578 mddev->private = priv;
3579 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
3580 mddev->level = mddev->new_level;
3581 mddev->layout = mddev->new_layout;
3582 mddev->chunk_sectors = mddev->new_chunk_sectors;
3583 mddev->delta_disks = 0;
3584 mddev->reshape_backwards = 0;
3585 mddev->degraded = 0;
3586 if (mddev->pers->sync_request == NULL) {
3587 /* this is now an array without redundancy, so
3588 * it must always be in_sync
3591 del_timer_sync(&mddev->safemode_timer);
3593 blk_set_stacking_limits(&mddev->queue->limits);
3595 set_bit(MD_CHANGE_DEVS, &mddev->flags);
3596 mddev_resume(mddev);
3598 md_update_sb(mddev, 1);
3599 sysfs_notify(&mddev->kobj, NULL, "level");
3600 md_new_event(mddev);
3604 static struct md_sysfs_entry md_level =
3605 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
3609 layout_show(struct mddev *mddev, char *page)
3611 /* just a number, not meaningful for all levels */
3612 if (mddev->reshape_position != MaxSector &&
3613 mddev->layout != mddev->new_layout)
3614 return sprintf(page, "%d (%d)\n",
3615 mddev->new_layout, mddev->layout);
3616 return sprintf(page, "%d\n", mddev->layout);
3620 layout_store(struct mddev *mddev, const char *buf, size_t len)
3623 unsigned long n = simple_strtoul(buf, &e, 10);
3625 if (!*buf || (*e && *e != '\n'))
3630 if (mddev->pers->check_reshape == NULL)
3634 mddev->new_layout = n;
3635 err = mddev->pers->check_reshape(mddev);
3637 mddev->new_layout = mddev->layout;
3641 mddev->new_layout = n;
3642 if (mddev->reshape_position == MaxSector)
3647 static struct md_sysfs_entry md_layout =
3648 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
3652 raid_disks_show(struct mddev *mddev, char *page)
3654 if (mddev->raid_disks == 0)
3656 if (mddev->reshape_position != MaxSector &&
3657 mddev->delta_disks != 0)
3658 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
3659 mddev->raid_disks - mddev->delta_disks);
3660 return sprintf(page, "%d\n", mddev->raid_disks);
3663 static int update_raid_disks(struct mddev *mddev, int raid_disks);
3666 raid_disks_store(struct mddev *mddev, const char *buf, size_t len)
3670 unsigned long n = simple_strtoul(buf, &e, 10);
3672 if (!*buf || (*e && *e != '\n'))
3676 rv = update_raid_disks(mddev, n);
3677 else if (mddev->reshape_position != MaxSector) {
3678 struct md_rdev *rdev;
3679 int olddisks = mddev->raid_disks - mddev->delta_disks;
3681 rdev_for_each(rdev, mddev) {
3683 rdev->data_offset < rdev->new_data_offset)
3686 rdev->data_offset > rdev->new_data_offset)
3689 mddev->delta_disks = n - olddisks;
3690 mddev->raid_disks = n;
3691 mddev->reshape_backwards = (mddev->delta_disks < 0);
3693 mddev->raid_disks = n;
3694 return rv ? rv : len;
3696 static struct md_sysfs_entry md_raid_disks =
3697 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
3700 chunk_size_show(struct mddev *mddev, char *page)
3702 if (mddev->reshape_position != MaxSector &&
3703 mddev->chunk_sectors != mddev->new_chunk_sectors)
3704 return sprintf(page, "%d (%d)\n",
3705 mddev->new_chunk_sectors << 9,
3706 mddev->chunk_sectors << 9);
3707 return sprintf(page, "%d\n", mddev->chunk_sectors << 9);
3711 chunk_size_store(struct mddev *mddev, const char *buf, size_t len)
3714 unsigned long n = simple_strtoul(buf, &e, 10);
3716 if (!*buf || (*e && *e != '\n'))
3721 if (mddev->pers->check_reshape == NULL)
3725 mddev->new_chunk_sectors = n >> 9;
3726 err = mddev->pers->check_reshape(mddev);
3728 mddev->new_chunk_sectors = mddev->chunk_sectors;
3732 mddev->new_chunk_sectors = n >> 9;
3733 if (mddev->reshape_position == MaxSector)
3734 mddev->chunk_sectors = n >> 9;
3738 static struct md_sysfs_entry md_chunk_size =
3739 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
3742 resync_start_show(struct mddev *mddev, char *page)
3744 if (mddev->recovery_cp == MaxSector)
3745 return sprintf(page, "none\n");
3746 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
3750 resync_start_store(struct mddev *mddev, const char *buf, size_t len)
3753 unsigned long long n = simple_strtoull(buf, &e, 10);
3755 if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
3757 if (cmd_match(buf, "none"))
3759 else if (!*buf || (*e && *e != '\n'))
3762 mddev->recovery_cp = n;
3764 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
3767 static struct md_sysfs_entry md_resync_start =
3768 __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store);
3771 * The array state can be:
3774 * No devices, no size, no level
3775 * Equivalent to STOP_ARRAY ioctl
3777 * May have some settings, but array is not active
3778 * all IO results in error
3779 * When written, doesn't tear down array, but just stops it
3780 * suspended (not supported yet)
3781 * All IO requests will block. The array can be reconfigured.
3782 * Writing this, if accepted, will block until array is quiescent
3784 * no resync can happen. no superblocks get written.
3785 * write requests fail
3787 * like readonly, but behaves like 'clean' on a write request.
3789 * clean - no pending writes, but otherwise active.
3790 * When written to inactive array, starts without resync
3791 * If a write request arrives then
3792 * if metadata is known, mark 'dirty' and switch to 'active'.
3793 * if not known, block and switch to write-pending
3794 * If written to an active array that has pending writes, then fails.
3796 * fully active: IO and resync can be happening.
3797 * When written to inactive array, starts with resync
3800 * clean, but writes are blocked waiting for 'active' to be written.
3803 * like active, but no writes have been seen for a while (100msec).
3806 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
3807 write_pending, active_idle, bad_word};
3808 static char *array_states[] = {
3809 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3810 "write-pending", "active-idle", NULL };
3812 static int match_word(const char *word, char **list)
3815 for (n=0; list[n]; n++)
3816 if (cmd_match(word, list[n]))
3822 array_state_show(struct mddev *mddev, char *page)
3824 enum array_state st = inactive;
3837 else if (test_bit(MD_CHANGE_PENDING, &mddev->flags))
3839 else if (mddev->safemode)
3845 if (list_empty(&mddev->disks) &&
3846 mddev->raid_disks == 0 &&
3847 mddev->dev_sectors == 0)
3852 return sprintf(page, "%s\n", array_states[st]);
3855 static int do_md_stop(struct mddev * mddev, int ro, struct block_device *bdev);
3856 static int md_set_readonly(struct mddev * mddev, struct block_device *bdev);
3857 static int do_md_run(struct mddev * mddev);
3858 static int restart_array(struct mddev *mddev);
3861 array_state_store(struct mddev *mddev, const char *buf, size_t len)
3864 enum array_state st = match_word(buf, array_states);
3869 /* stopping an active array */
3870 err = do_md_stop(mddev, 0, NULL);
3873 /* stopping an active array */
3875 err = do_md_stop(mddev, 2, NULL);
3877 err = 0; /* already inactive */
3880 break; /* not supported yet */
3883 err = md_set_readonly(mddev, NULL);
3886 set_disk_ro(mddev->gendisk, 1);
3887 err = do_md_run(mddev);
3893 err = md_set_readonly(mddev, NULL);
3894 else if (mddev->ro == 1)
3895 err = restart_array(mddev);
3898 set_disk_ro(mddev->gendisk, 0);
3902 err = do_md_run(mddev);
3907 restart_array(mddev);
3908 spin_lock_irq(&mddev->write_lock);
3909 if (atomic_read(&mddev->writes_pending) == 0) {
3910 if (mddev->in_sync == 0) {
3912 if (mddev->safemode == 1)
3913 mddev->safemode = 0;
3914 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
3919 spin_unlock_irq(&mddev->write_lock);
3925 restart_array(mddev);
3926 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
3927 wake_up(&mddev->sb_wait);
3931 set_disk_ro(mddev->gendisk, 0);
3932 err = do_md_run(mddev);
3937 /* these cannot be set */
3943 if (mddev->hold_active == UNTIL_IOCTL)
3944 mddev->hold_active = 0;
3945 sysfs_notify_dirent_safe(mddev->sysfs_state);
3949 static struct md_sysfs_entry md_array_state =
3950 __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
3953 max_corrected_read_errors_show(struct mddev *mddev, char *page) {
3954 return sprintf(page, "%d\n",
3955 atomic_read(&mddev->max_corr_read_errors));
3959 max_corrected_read_errors_store(struct mddev *mddev, const char *buf, size_t len)
3962 unsigned long n = simple_strtoul(buf, &e, 10);
3964 if (*buf && (*e == 0 || *e == '\n')) {
3965 atomic_set(&mddev->max_corr_read_errors, n);
3971 static struct md_sysfs_entry max_corr_read_errors =
3972 __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show,
3973 max_corrected_read_errors_store);
3976 null_show(struct mddev *mddev, char *page)
3982 new_dev_store(struct mddev *mddev, const char *buf, size_t len)
3984 /* buf must be %d:%d\n? giving major and minor numbers */
3985 /* The new device is added to the array.
3986 * If the array has a persistent superblock, we read the
3987 * superblock to initialise info and check validity.
3988 * Otherwise, only checking done is that in bind_rdev_to_array,
3989 * which mainly checks size.
3992 int major = simple_strtoul(buf, &e, 10);
3995 struct md_rdev *rdev;
3998 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
4000 minor = simple_strtoul(e+1, &e, 10);
4001 if (*e && *e != '\n')
4003 dev = MKDEV(major, minor);
4004 if (major != MAJOR(dev) ||
4005 minor != MINOR(dev))
4009 if (mddev->persistent) {
4010 rdev = md_import_device(dev, mddev->major_version,
4011 mddev->minor_version);
4012 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
4013 struct md_rdev *rdev0
4014 = list_entry(mddev->disks.next,
4015 struct md_rdev, same_set);
4016 err = super_types[mddev->major_version]
4017 .load_super(rdev, rdev0, mddev->minor_version);
4021 } else if (mddev->external)
4022 rdev = md_import_device(dev, -2, -1);
4024 rdev = md_import_device(dev, -1, -1);
4027 return PTR_ERR(rdev);
4028 err = bind_rdev_to_array(rdev, mddev);
4032 return err ? err : len;
4035 static struct md_sysfs_entry md_new_device =
4036 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
4039 bitmap_store(struct mddev *mddev, const char *buf, size_t len)
4042 unsigned long chunk, end_chunk;
4046 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
4048 chunk = end_chunk = simple_strtoul(buf, &end, 0);
4049 if (buf == end) break;
4050 if (*end == '-') { /* range */
4052 end_chunk = simple_strtoul(buf, &end, 0);
4053 if (buf == end) break;
4055 if (*end && !isspace(*end)) break;
4056 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
4057 buf = skip_spaces(end);
4059 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
4064 static struct md_sysfs_entry md_bitmap =
4065 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
4068 size_show(struct mddev *mddev, char *page)
4070 return sprintf(page, "%llu\n",
4071 (unsigned long long)mddev->dev_sectors / 2);
4074 static int update_size(struct mddev *mddev, sector_t num_sectors);
4077 size_store(struct mddev *mddev, const char *buf, size_t len)
4079 /* If array is inactive, we can reduce the component size, but
4080 * not increase it (except from 0).
4081 * If array is active, we can try an on-line resize
4084 int err = strict_blocks_to_sectors(buf, §ors);
4089 err = update_size(mddev, sectors);
4090 md_update_sb(mddev, 1);
4092 if (mddev->dev_sectors == 0 ||
4093 mddev->dev_sectors > sectors)
4094 mddev->dev_sectors = sectors;
4098 return err ? err : len;
4101 static struct md_sysfs_entry md_size =
4102 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
4105 /* Metadata version.
4107 * 'none' for arrays with no metadata (good luck...)
4108 * 'external' for arrays with externally managed metadata,
4109 * or N.M for internally known formats
4112 metadata_show(struct mddev *mddev, char *page)
4114 if (mddev->persistent)
4115 return sprintf(page, "%d.%d\n",
4116 mddev->major_version, mddev->minor_version);
4117 else if (mddev->external)
4118 return sprintf(page, "external:%s\n", mddev->metadata_type);
4120 return sprintf(page, "none\n");
4124 metadata_store(struct mddev *mddev, const char *buf, size_t len)
4128 /* Changing the details of 'external' metadata is
4129 * always permitted. Otherwise there must be
4130 * no devices attached to the array.
4132 if (mddev->external && strncmp(buf, "external:", 9) == 0)
4134 else if (!list_empty(&mddev->disks))
4137 if (cmd_match(buf, "none")) {
4138 mddev->persistent = 0;
4139 mddev->external = 0;
4140 mddev->major_version = 0;
4141 mddev->minor_version = 90;
4144 if (strncmp(buf, "external:", 9) == 0) {
4145 size_t namelen = len-9;
4146 if (namelen >= sizeof(mddev->metadata_type))
4147 namelen = sizeof(mddev->metadata_type)-1;
4148 strncpy(mddev->metadata_type, buf+9, namelen);
4149 mddev->metadata_type[namelen] = 0;
4150 if (namelen && mddev->metadata_type[namelen-1] == '\n')
4151 mddev->metadata_type[--namelen] = 0;
4152 mddev->persistent = 0;
4153 mddev->external = 1;
4154 mddev->major_version = 0;
4155 mddev->minor_version = 90;
4158 major = simple_strtoul(buf, &e, 10);
4159 if (e==buf || *e != '.')
4162 minor = simple_strtoul(buf, &e, 10);
4163 if (e==buf || (*e && *e != '\n') )
4165 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
4167 mddev->major_version = major;
4168 mddev->minor_version = minor;
4169 mddev->persistent = 1;
4170 mddev->external = 0;
4174 static struct md_sysfs_entry md_metadata =
4175 __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
4178 action_show(struct mddev *mddev, char *page)
4180 char *type = "idle";
4181 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
4183 else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
4184 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) {
4185 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
4187 else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
4188 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
4190 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
4194 } else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
4197 return sprintf(page, "%s\n", type);
4201 action_store(struct mddev *mddev, const char *page, size_t len)
4203 if (!mddev->pers || !mddev->pers->sync_request)
4206 if (cmd_match(page, "frozen"))
4207 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4209 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4211 if (cmd_match(page, "idle") || cmd_match(page, "frozen")) {
4212 if (mddev->sync_thread) {
4213 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4214 md_reap_sync_thread(mddev);
4216 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
4217 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
4219 else if (cmd_match(page, "resync"))
4220 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4221 else if (cmd_match(page, "recover")) {
4222 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
4223 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4224 } else if (cmd_match(page, "reshape")) {
4226 if (mddev->pers->start_reshape == NULL)
4228 err = mddev->pers->start_reshape(mddev);
4231 sysfs_notify(&mddev->kobj, NULL, "degraded");
4233 if (cmd_match(page, "check"))
4234 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
4235 else if (!cmd_match(page, "repair"))
4237 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
4238 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
4240 if (mddev->ro == 2) {
4241 /* A write to sync_action is enough to justify
4242 * canceling read-auto mode
4245 md_wakeup_thread(mddev->sync_thread);
4247 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4248 md_wakeup_thread(mddev->thread);
4249 sysfs_notify_dirent_safe(mddev->sysfs_action);
4253 static struct md_sysfs_entry md_scan_mode =
4254 __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
4257 last_sync_action_show(struct mddev *mddev, char *page)
4259 return sprintf(page, "%s\n", mddev->last_sync_action);
4262 static struct md_sysfs_entry md_last_scan_mode = __ATTR_RO(last_sync_action);
4265 mismatch_cnt_show(struct mddev *mddev, char *page)
4267 return sprintf(page, "%llu\n",
4268 (unsigned long long)
4269 atomic64_read(&mddev->resync_mismatches));
4272 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
4275 sync_min_show(struct mddev *mddev, char *page)
4277 return sprintf(page, "%d (%s)\n", speed_min(mddev),
4278 mddev->sync_speed_min ? "local": "system");
4282 sync_min_store(struct mddev *mddev, const char *buf, size_t len)
4286 if (strncmp(buf, "system", 6)==0) {
4287 mddev->sync_speed_min = 0;
4290 min = simple_strtoul(buf, &e, 10);
4291 if (buf == e || (*e && *e != '\n') || min <= 0)
4293 mddev->sync_speed_min = min;
4297 static struct md_sysfs_entry md_sync_min =
4298 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
4301 sync_max_show(struct mddev *mddev, char *page)
4303 return sprintf(page, "%d (%s)\n", speed_max(mddev),
4304 mddev->sync_speed_max ? "local": "system");
4308 sync_max_store(struct mddev *mddev, const char *buf, size_t len)
4312 if (strncmp(buf, "system", 6)==0) {
4313 mddev->sync_speed_max = 0;
4316 max = simple_strtoul(buf, &e, 10);
4317 if (buf == e || (*e && *e != '\n') || max <= 0)
4319 mddev->sync_speed_max = max;
4323 static struct md_sysfs_entry md_sync_max =
4324 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
4327 degraded_show(struct mddev *mddev, char *page)
4329 return sprintf(page, "%d\n", mddev->degraded);
4331 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
4334 sync_force_parallel_show(struct mddev *mddev, char *page)
4336 return sprintf(page, "%d\n", mddev->parallel_resync);
4340 sync_force_parallel_store(struct mddev *mddev, const char *buf, size_t len)
4344 if (kstrtol(buf, 10, &n))
4347 if (n != 0 && n != 1)
4350 mddev->parallel_resync = n;
4352 if (mddev->sync_thread)
4353 wake_up(&resync_wait);
4358 /* force parallel resync, even with shared block devices */
4359 static struct md_sysfs_entry md_sync_force_parallel =
4360 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
4361 sync_force_parallel_show, sync_force_parallel_store);
4364 sync_speed_show(struct mddev *mddev, char *page)
4366 unsigned long resync, dt, db;
4367 if (mddev->curr_resync == 0)
4368 return sprintf(page, "none\n");
4369 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
4370 dt = (jiffies - mddev->resync_mark) / HZ;
4372 db = resync - mddev->resync_mark_cnt;
4373 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
4376 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
4379 sync_completed_show(struct mddev *mddev, char *page)
4381 unsigned long long max_sectors, resync;
4383 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4384 return sprintf(page, "none\n");
4386 if (mddev->curr_resync == 1 ||
4387 mddev->curr_resync == 2)
4388 return sprintf(page, "delayed\n");
4390 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
4391 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
4392 max_sectors = mddev->resync_max_sectors;
4394 max_sectors = mddev->dev_sectors;
4396 resync = mddev->curr_resync_completed;
4397 return sprintf(page, "%llu / %llu\n", resync, max_sectors);
4400 static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed);
4403 min_sync_show(struct mddev *mddev, char *page)
4405 return sprintf(page, "%llu\n",
4406 (unsigned long long)mddev->resync_min);
4409 min_sync_store(struct mddev *mddev, const char *buf, size_t len)
4411 unsigned long long min;
4412 if (kstrtoull(buf, 10, &min))
4414 if (min > mddev->resync_max)
4416 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4419 /* Must be a multiple of chunk_size */
4420 if (mddev->chunk_sectors) {
4421 sector_t temp = min;
4422 if (sector_div(temp, mddev->chunk_sectors))
4425 mddev->resync_min = min;
4430 static struct md_sysfs_entry md_min_sync =
4431 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
4434 max_sync_show(struct mddev *mddev, char *page)
4436 if (mddev->resync_max == MaxSector)
4437 return sprintf(page, "max\n");
4439 return sprintf(page, "%llu\n",
4440 (unsigned long long)mddev->resync_max);
4443 max_sync_store(struct mddev *mddev, const char *buf, size_t len)
4445 if (strncmp(buf, "max", 3) == 0)
4446 mddev->resync_max = MaxSector;
4448 unsigned long long max;
4449 if (kstrtoull(buf, 10, &max))
4451 if (max < mddev->resync_min)
4453 if (max < mddev->resync_max &&
4455 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4458 /* Must be a multiple of chunk_size */
4459 if (mddev->chunk_sectors) {
4460 sector_t temp = max;
4461 if (sector_div(temp, mddev->chunk_sectors))
4464 mddev->resync_max = max;
4466 wake_up(&mddev->recovery_wait);
4470 static struct md_sysfs_entry md_max_sync =
4471 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
4474 suspend_lo_show(struct mddev *mddev, char *page)
4476 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
4480 suspend_lo_store(struct mddev *mddev, const char *buf, size_t len)
4483 unsigned long long new = simple_strtoull(buf, &e, 10);
4484 unsigned long long old = mddev->suspend_lo;
4486 if (mddev->pers == NULL ||
4487 mddev->pers->quiesce == NULL)
4489 if (buf == e || (*e && *e != '\n'))
4492 mddev->suspend_lo = new;
4494 /* Shrinking suspended region */
4495 mddev->pers->quiesce(mddev, 2);
4497 /* Expanding suspended region - need to wait */
4498 mddev->pers->quiesce(mddev, 1);
4499 mddev->pers->quiesce(mddev, 0);
4503 static struct md_sysfs_entry md_suspend_lo =
4504 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
4508 suspend_hi_show(struct mddev *mddev, char *page)
4510 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
4514 suspend_hi_store(struct mddev *mddev, const char *buf, size_t len)
4517 unsigned long long new = simple_strtoull(buf, &e, 10);
4518 unsigned long long old = mddev->suspend_hi;
4520 if (mddev->pers == NULL ||
4521 mddev->pers->quiesce == NULL)
4523 if (buf == e || (*e && *e != '\n'))
4526 mddev->suspend_hi = new;
4528 /* Shrinking suspended region */
4529 mddev->pers->quiesce(mddev, 2);
4531 /* Expanding suspended region - need to wait */
4532 mddev->pers->quiesce(mddev, 1);
4533 mddev->pers->quiesce(mddev, 0);
4537 static struct md_sysfs_entry md_suspend_hi =
4538 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
4541 reshape_position_show(struct mddev *mddev, char *page)
4543 if (mddev->reshape_position != MaxSector)
4544 return sprintf(page, "%llu\n",
4545 (unsigned long long)mddev->reshape_position);
4546 strcpy(page, "none\n");
4551 reshape_position_store(struct mddev *mddev, const char *buf, size_t len)
4553 struct md_rdev *rdev;
4555 unsigned long long new = simple_strtoull(buf, &e, 10);
4558 if (buf == e || (*e && *e != '\n'))
4560 mddev->reshape_position = new;
4561 mddev->delta_disks = 0;
4562 mddev->reshape_backwards = 0;
4563 mddev->new_level = mddev->level;
4564 mddev->new_layout = mddev->layout;
4565 mddev->new_chunk_sectors = mddev->chunk_sectors;
4566 rdev_for_each(rdev, mddev)
4567 rdev->new_data_offset = rdev->data_offset;
4571 static struct md_sysfs_entry md_reshape_position =
4572 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
4573 reshape_position_store);
4576 reshape_direction_show(struct mddev *mddev, char *page)
4578 return sprintf(page, "%s\n",
4579 mddev->reshape_backwards ? "backwards" : "forwards");
4583 reshape_direction_store(struct mddev *mddev, const char *buf, size_t len)
4586 if (cmd_match(buf, "forwards"))
4588 else if (cmd_match(buf, "backwards"))
4592 if (mddev->reshape_backwards == backwards)
4595 /* check if we are allowed to change */
4596 if (mddev->delta_disks)
4599 if (mddev->persistent &&
4600 mddev->major_version == 0)
4603 mddev->reshape_backwards = backwards;
4607 static struct md_sysfs_entry md_reshape_direction =
4608 __ATTR(reshape_direction, S_IRUGO|S_IWUSR, reshape_direction_show,
4609 reshape_direction_store);
4612 array_size_show(struct mddev *mddev, char *page)
4614 if (mddev->external_size)
4615 return sprintf(page, "%llu\n",
4616 (unsigned long long)mddev->array_sectors/2);
4618 return sprintf(page, "default\n");
4622 array_size_store(struct mddev *mddev, const char *buf, size_t len)
4626 if (strncmp(buf, "default", 7) == 0) {
4628 sectors = mddev->pers->size(mddev, 0, 0);
4630 sectors = mddev->array_sectors;
4632 mddev->external_size = 0;
4634 if (strict_blocks_to_sectors(buf, §ors) < 0)
4636 if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors)
4639 mddev->external_size = 1;
4642 mddev->array_sectors = sectors;
4644 set_capacity(mddev->gendisk, mddev->array_sectors);
4645 revalidate_disk(mddev->gendisk);
4650 static struct md_sysfs_entry md_array_size =
4651 __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show,
4654 static struct attribute *md_default_attrs[] = {
4657 &md_raid_disks.attr,
4658 &md_chunk_size.attr,
4660 &md_resync_start.attr,
4662 &md_new_device.attr,
4663 &md_safe_delay.attr,
4664 &md_array_state.attr,
4665 &md_reshape_position.attr,
4666 &md_reshape_direction.attr,
4667 &md_array_size.attr,
4668 &max_corr_read_errors.attr,
4672 static struct attribute *md_redundancy_attrs[] = {
4674 &md_last_scan_mode.attr,
4675 &md_mismatches.attr,
4678 &md_sync_speed.attr,
4679 &md_sync_force_parallel.attr,
4680 &md_sync_completed.attr,
4683 &md_suspend_lo.attr,
4684 &md_suspend_hi.attr,
4689 static struct attribute_group md_redundancy_group = {
4691 .attrs = md_redundancy_attrs,
4696 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
4698 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
4699 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
4704 spin_lock(&all_mddevs_lock);
4705 if (list_empty(&mddev->all_mddevs)) {
4706 spin_unlock(&all_mddevs_lock);
4710 spin_unlock(&all_mddevs_lock);
4712 rv = mddev_lock(mddev);
4714 rv = entry->show(mddev, page);
4715 mddev_unlock(mddev);
4722 md_attr_store(struct kobject *kobj, struct attribute *attr,
4723 const char *page, size_t length)
4725 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
4726 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
4731 if (!capable(CAP_SYS_ADMIN))
4733 spin_lock(&all_mddevs_lock);
4734 if (list_empty(&mddev->all_mddevs)) {
4735 spin_unlock(&all_mddevs_lock);
4739 spin_unlock(&all_mddevs_lock);
4740 if (entry->store == new_dev_store)
4741 flush_workqueue(md_misc_wq);
4742 rv = mddev_lock(mddev);
4744 rv = entry->store(mddev, page, length);
4745 mddev_unlock(mddev);
4751 static void md_free(struct kobject *ko)
4753 struct mddev *mddev = container_of(ko, struct mddev, kobj);
4755 if (mddev->sysfs_state)
4756 sysfs_put(mddev->sysfs_state);
4758 if (mddev->gendisk) {
4759 del_gendisk(mddev->gendisk);
4760 put_disk(mddev->gendisk);
4763 blk_cleanup_queue(mddev->queue);
4768 static const struct sysfs_ops md_sysfs_ops = {
4769 .show = md_attr_show,
4770 .store = md_attr_store,
4772 static struct kobj_type md_ktype = {
4774 .sysfs_ops = &md_sysfs_ops,
4775 .default_attrs = md_default_attrs,
4780 static void mddev_delayed_delete(struct work_struct *ws)
4782 struct mddev *mddev = container_of(ws, struct mddev, del_work);
4784 sysfs_remove_group(&mddev->kobj, &md_bitmap_group);
4785 kobject_del(&mddev->kobj);
4786 kobject_put(&mddev->kobj);
4789 static int md_alloc(dev_t dev, char *name)
4791 static DEFINE_MUTEX(disks_mutex);
4792 struct mddev *mddev = mddev_find(dev);
4793 struct gendisk *disk;
4802 partitioned = (MAJOR(mddev->unit) != MD_MAJOR);
4803 shift = partitioned ? MdpMinorShift : 0;
4804 unit = MINOR(mddev->unit) >> shift;
4806 /* wait for any previous instance of this device to be
4807 * completely removed (mddev_delayed_delete).
4809 flush_workqueue(md_misc_wq);
4811 mutex_lock(&disks_mutex);
4817 /* Need to ensure that 'name' is not a duplicate.
4819 struct mddev *mddev2;
4820 spin_lock(&all_mddevs_lock);
4822 list_for_each_entry(mddev2, &all_mddevs, all_mddevs)
4823 if (mddev2->gendisk &&
4824 strcmp(mddev2->gendisk->disk_name, name) == 0) {
4825 spin_unlock(&all_mddevs_lock);
4828 spin_unlock(&all_mddevs_lock);
4832 mddev->queue = blk_alloc_queue(GFP_KERNEL);
4835 mddev->queue->queuedata = mddev;
4837 blk_queue_make_request(mddev->queue, md_make_request);
4838 blk_set_stacking_limits(&mddev->queue->limits);
4840 disk = alloc_disk(1 << shift);
4842 blk_cleanup_queue(mddev->queue);
4843 mddev->queue = NULL;
4846 disk->major = MAJOR(mddev->unit);
4847 disk->first_minor = unit << shift;
4849 strcpy(disk->disk_name, name);
4850 else if (partitioned)
4851 sprintf(disk->disk_name, "md_d%d", unit);
4853 sprintf(disk->disk_name, "md%d", unit);
4854 disk->fops = &md_fops;
4855 disk->private_data = mddev;
4856 disk->queue = mddev->queue;
4857 blk_queue_flush(mddev->queue, REQ_FLUSH | REQ_FUA);
4858 /* Allow extended partitions. This makes the
4859 * 'mdp' device redundant, but we can't really
4862 disk->flags |= GENHD_FL_EXT_DEVT;
4863 mddev->gendisk = disk;
4864 /* As soon as we call add_disk(), another thread could get
4865 * through to md_open, so make sure it doesn't get too far
4867 mutex_lock(&mddev->open_mutex);
4870 error = kobject_init_and_add(&mddev->kobj, &md_ktype,
4871 &disk_to_dev(disk)->kobj, "%s", "md");
4873 /* This isn't possible, but as kobject_init_and_add is marked
4874 * __must_check, we must do something with the result
4876 printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
4880 if (mddev->kobj.sd &&
4881 sysfs_create_group(&mddev->kobj, &md_bitmap_group))
4882 printk(KERN_DEBUG "pointless warning\n");
4883 mutex_unlock(&mddev->open_mutex);
4885 mutex_unlock(&disks_mutex);
4886 if (!error && mddev->kobj.sd) {
4887 kobject_uevent(&mddev->kobj, KOBJ_ADD);
4888 mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state");
4894 static struct kobject *md_probe(dev_t dev, int *part, void *data)
4896 md_alloc(dev, NULL);
4900 static int add_named_array(const char *val, struct kernel_param *kp)
4902 /* val must be "md_*" where * is not all digits.
4903 * We allocate an array with a large free minor number, and
4904 * set the name to val. val must not already be an active name.
4906 int len = strlen(val);
4907 char buf[DISK_NAME_LEN];
4909 while (len && val[len-1] == '\n')
4911 if (len >= DISK_NAME_LEN)
4913 strlcpy(buf, val, len+1);
4914 if (strncmp(buf, "md_", 3) != 0)
4916 return md_alloc(0, buf);
4919 static void md_safemode_timeout(unsigned long data)
4921 struct mddev *mddev = (struct mddev *) data;
4923 if (!atomic_read(&mddev->writes_pending)) {
4924 mddev->safemode = 1;
4925 if (mddev->external)
4926 sysfs_notify_dirent_safe(mddev->sysfs_state);
4928 md_wakeup_thread(mddev->thread);
4931 static int start_dirty_degraded;
4933 int md_run(struct mddev *mddev)
4936 struct md_rdev *rdev;
4937 struct md_personality *pers;
4939 if (list_empty(&mddev->disks))
4940 /* cannot run an array with no devices.. */
4945 /* Cannot run until previous stop completes properly */
4946 if (mddev->sysfs_active)
4950 * Analyze all RAID superblock(s)
4952 if (!mddev->raid_disks) {
4953 if (!mddev->persistent)
4958 if (mddev->level != LEVEL_NONE)
4959 request_module("md-level-%d", mddev->level);
4960 else if (mddev->clevel[0])
4961 request_module("md-%s", mddev->clevel);
4964 * Drop all container device buffers, from now on
4965 * the only valid external interface is through the md
4968 rdev_for_each(rdev, mddev) {
4969 if (test_bit(Faulty, &rdev->flags))
4971 sync_blockdev(rdev->bdev);
4972 invalidate_bdev(rdev->bdev);
4974 /* perform some consistency tests on the device.
4975 * We don't want the data to overlap the metadata,
4976 * Internal Bitmap issues have been handled elsewhere.
4978 if (rdev->meta_bdev) {
4979 /* Nothing to check */;
4980 } else if (rdev->data_offset < rdev->sb_start) {
4981 if (mddev->dev_sectors &&
4982 rdev->data_offset + mddev->dev_sectors
4984 printk("md: %s: data overlaps metadata\n",
4989 if (rdev->sb_start + rdev->sb_size/512
4990 > rdev->data_offset) {
4991 printk("md: %s: metadata overlaps data\n",
4996 sysfs_notify_dirent_safe(rdev->sysfs_state);
4999 if (mddev->bio_set == NULL)
5000 mddev->bio_set = bioset_create(BIO_POOL_SIZE, 0);
5002 spin_lock(&pers_lock);
5003 pers = find_pers(mddev->level, mddev->clevel);
5004 if (!pers || !try_module_get(pers->owner)) {
5005 spin_unlock(&pers_lock);
5006 if (mddev->level != LEVEL_NONE)
5007 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
5010 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
5015 spin_unlock(&pers_lock);
5016 if (mddev->level != pers->level) {
5017 mddev->level = pers->level;
5018 mddev->new_level = pers->level;
5020 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
5022 if (mddev->reshape_position != MaxSector &&
5023 pers->start_reshape == NULL) {
5024 /* This personality cannot handle reshaping... */
5026 module_put(pers->owner);
5030 if (pers->sync_request) {
5031 /* Warn if this is a potentially silly
5034 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
5035 struct md_rdev *rdev2;
5038 rdev_for_each(rdev, mddev)
5039 rdev_for_each(rdev2, mddev) {
5041 rdev->bdev->bd_contains ==
5042 rdev2->bdev->bd_contains) {
5044 "%s: WARNING: %s appears to be"
5045 " on the same physical disk as"
5048 bdevname(rdev->bdev,b),
5049 bdevname(rdev2->bdev,b2));
5056 "True protection against single-disk"
5057 " failure might be compromised.\n");
5060 mddev->recovery = 0;
5061 /* may be over-ridden by personality */
5062 mddev->resync_max_sectors = mddev->dev_sectors;
5064 mddev->ok_start_degraded = start_dirty_degraded;
5066 if (start_readonly && mddev->ro == 0)
5067 mddev->ro = 2; /* read-only, but switch on first write */
5069 err = mddev->pers->run(mddev);
5071 printk(KERN_ERR "md: pers->run() failed ...\n");
5072 else if (mddev->pers->size(mddev, 0, 0) < mddev->array_sectors) {
5073 WARN_ONCE(!mddev->external_size, "%s: default size too small,"
5074 " but 'external_size' not in effect?\n", __func__);
5076 "md: invalid array_size %llu > default size %llu\n",
5077 (unsigned long long)mddev->array_sectors / 2,
5078 (unsigned long long)mddev->pers->size(mddev, 0, 0) / 2);
5080 mddev->pers->stop(mddev);
5082 if (err == 0 && mddev->pers->sync_request &&
5083 (mddev->bitmap_info.file || mddev->bitmap_info.offset)) {
5084 err = bitmap_create(mddev);
5086 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
5087 mdname(mddev), err);
5088 mddev->pers->stop(mddev);
5092 module_put(mddev->pers->owner);
5094 bitmap_destroy(mddev);
5097 if (mddev->pers->sync_request) {
5098 if (mddev->kobj.sd &&
5099 sysfs_create_group(&mddev->kobj, &md_redundancy_group))
5101 "md: cannot register extra attributes for %s\n",
5103 mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action");
5104 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
5107 atomic_set(&mddev->writes_pending,0);
5108 atomic_set(&mddev->max_corr_read_errors,
5109 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS);
5110 mddev->safemode = 0;
5111 mddev->safemode_timer.function = md_safemode_timeout;
5112 mddev->safemode_timer.data = (unsigned long) mddev;
5113 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
5117 rdev_for_each(rdev, mddev)
5118 if (rdev->raid_disk >= 0)
5119 if (sysfs_link_rdev(mddev, rdev))
5120 /* failure here is OK */;
5122 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5124 if (mddev->flags & MD_UPDATE_SB_FLAGS)
5125 md_update_sb(mddev, 0);
5127 md_new_event(mddev);
5128 sysfs_notify_dirent_safe(mddev->sysfs_state);
5129 sysfs_notify_dirent_safe(mddev->sysfs_action);
5130 sysfs_notify(&mddev->kobj, NULL, "degraded");
5133 EXPORT_SYMBOL_GPL(md_run);
5135 static int do_md_run(struct mddev *mddev)
5139 err = md_run(mddev);
5142 err = bitmap_load(mddev);
5144 bitmap_destroy(mddev);
5148 md_wakeup_thread(mddev->thread);
5149 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
5151 set_capacity(mddev->gendisk, mddev->array_sectors);
5152 revalidate_disk(mddev->gendisk);
5154 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
5159 static int restart_array(struct mddev *mddev)
5161 struct gendisk *disk = mddev->gendisk;
5163 /* Complain if it has no devices */
5164 if (list_empty(&mddev->disks))
5170 mddev->safemode = 0;
5172 set_disk_ro(disk, 0);
5173 printk(KERN_INFO "md: %s switched to read-write mode.\n",
5175 /* Kick recovery or resync if necessary */
5176 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5177 md_wakeup_thread(mddev->thread);
5178 md_wakeup_thread(mddev->sync_thread);
5179 sysfs_notify_dirent_safe(mddev->sysfs_state);
5183 static void md_clean(struct mddev *mddev)
5185 mddev->array_sectors = 0;
5186 mddev->external_size = 0;
5187 mddev->dev_sectors = 0;
5188 mddev->raid_disks = 0;
5189 mddev->recovery_cp = 0;
5190 mddev->resync_min = 0;
5191 mddev->resync_max = MaxSector;
5192 mddev->reshape_position = MaxSector;
5193 mddev->external = 0;
5194 mddev->persistent = 0;
5195 mddev->level = LEVEL_NONE;
5196 mddev->clevel[0] = 0;
5199 mddev->metadata_type[0] = 0;
5200 mddev->chunk_sectors = 0;
5201 mddev->ctime = mddev->utime = 0;
5203 mddev->max_disks = 0;
5205 mddev->can_decrease_events = 0;
5206 mddev->delta_disks = 0;
5207 mddev->reshape_backwards = 0;
5208 mddev->new_level = LEVEL_NONE;
5209 mddev->new_layout = 0;
5210 mddev->new_chunk_sectors = 0;
5211 mddev->curr_resync = 0;
5212 atomic64_set(&mddev->resync_mismatches, 0);
5213 mddev->suspend_lo = mddev->suspend_hi = 0;
5214 mddev->sync_speed_min = mddev->sync_speed_max = 0;
5215 mddev->recovery = 0;
5218 mddev->degraded = 0;
5219 mddev->safemode = 0;
5220 mddev->merge_check_needed = 0;
5221 mddev->bitmap_info.offset = 0;
5222 mddev->bitmap_info.default_offset = 0;
5223 mddev->bitmap_info.default_space = 0;
5224 mddev->bitmap_info.chunksize = 0;
5225 mddev->bitmap_info.daemon_sleep = 0;
5226 mddev->bitmap_info.max_write_behind = 0;
5229 static void __md_stop_writes(struct mddev *mddev)
5231 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5232 if (mddev->sync_thread) {
5233 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5234 md_reap_sync_thread(mddev);
5237 del_timer_sync(&mddev->safemode_timer);
5239 bitmap_flush(mddev);
5240 md_super_wait(mddev);
5242 if (mddev->ro == 0 &&
5243 (!mddev->in_sync || (mddev->flags & MD_UPDATE_SB_FLAGS))) {
5244 /* mark array as shutdown cleanly */
5246 md_update_sb(mddev, 1);
5250 void md_stop_writes(struct mddev *mddev)
5252 mddev_lock_nointr(mddev);
5253 __md_stop_writes(mddev);
5254 mddev_unlock(mddev);
5256 EXPORT_SYMBOL_GPL(md_stop_writes);
5258 static void __md_stop(struct mddev *mddev)
5261 mddev->pers->stop(mddev);
5262 if (mddev->pers->sync_request && mddev->to_remove == NULL)
5263 mddev->to_remove = &md_redundancy_group;
5264 module_put(mddev->pers->owner);
5266 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5269 void md_stop(struct mddev *mddev)
5271 /* stop the array and free an attached data structures.
5272 * This is called from dm-raid
5275 bitmap_destroy(mddev);
5277 bioset_free(mddev->bio_set);
5280 EXPORT_SYMBOL_GPL(md_stop);
5282 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev)
5287 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
5289 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5290 md_wakeup_thread(mddev->thread);
5292 if (mddev->sync_thread) {
5293 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5294 /* Thread might be blocked waiting for metadata update
5295 * which will now never happen */
5296 wake_up_process(mddev->sync_thread->tsk);
5298 mddev_unlock(mddev);
5299 wait_event(resync_wait, mddev->sync_thread == NULL);
5300 mddev_lock_nointr(mddev);
5302 mutex_lock(&mddev->open_mutex);
5303 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
5304 mddev->sync_thread ||
5305 (bdev && !test_bit(MD_STILL_CLOSED, &mddev->flags))) {
5306 printk("md: %s still in use.\n",mdname(mddev));
5308 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5309 md_wakeup_thread(mddev->thread);
5315 __md_stop_writes(mddev);
5321 set_disk_ro(mddev->gendisk, 1);
5322 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5323 sysfs_notify_dirent_safe(mddev->sysfs_state);
5327 mutex_unlock(&mddev->open_mutex);
5332 * 0 - completely stop and dis-assemble array
5333 * 2 - stop but do not disassemble array
5335 static int do_md_stop(struct mddev * mddev, int mode,
5336 struct block_device *bdev)
5338 struct gendisk *disk = mddev->gendisk;
5339 struct md_rdev *rdev;
5342 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
5344 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5345 md_wakeup_thread(mddev->thread);
5347 if (mddev->sync_thread) {
5348 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5349 /* Thread might be blocked waiting for metadata update
5350 * which will now never happen */
5351 wake_up_process(mddev->sync_thread->tsk);
5353 mddev_unlock(mddev);
5354 wait_event(resync_wait, mddev->sync_thread == NULL);
5355 mddev_lock_nointr(mddev);
5357 mutex_lock(&mddev->open_mutex);
5358 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
5359 mddev->sysfs_active ||
5360 mddev->sync_thread ||
5361 (bdev && !test_bit(MD_STILL_CLOSED, &mddev->flags))) {
5362 printk("md: %s still in use.\n",mdname(mddev));
5363 mutex_unlock(&mddev->open_mutex);
5365 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5366 md_wakeup_thread(mddev->thread);
5372 set_disk_ro(disk, 0);
5374 __md_stop_writes(mddev);
5376 mddev->queue->merge_bvec_fn = NULL;
5377 mddev->queue->backing_dev_info.congested_fn = NULL;
5379 /* tell userspace to handle 'inactive' */
5380 sysfs_notify_dirent_safe(mddev->sysfs_state);
5382 rdev_for_each(rdev, mddev)
5383 if (rdev->raid_disk >= 0)
5384 sysfs_unlink_rdev(mddev, rdev);
5386 set_capacity(disk, 0);
5387 mutex_unlock(&mddev->open_mutex);
5389 revalidate_disk(disk);
5394 mutex_unlock(&mddev->open_mutex);
5396 * Free resources if final stop
5399 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
5401 bitmap_destroy(mddev);
5402 if (mddev->bitmap_info.file) {
5403 fput(mddev->bitmap_info.file);
5404 mddev->bitmap_info.file = NULL;
5406 mddev->bitmap_info.offset = 0;
5408 export_array(mddev);
5411 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
5412 if (mddev->hold_active == UNTIL_STOP)
5413 mddev->hold_active = 0;
5415 blk_integrity_unregister(disk);
5416 md_new_event(mddev);
5417 sysfs_notify_dirent_safe(mddev->sysfs_state);
5422 static void autorun_array(struct mddev *mddev)
5424 struct md_rdev *rdev;
5427 if (list_empty(&mddev->disks))
5430 printk(KERN_INFO "md: running: ");
5432 rdev_for_each(rdev, mddev) {
5433 char b[BDEVNAME_SIZE];
5434 printk("<%s>", bdevname(rdev->bdev,b));
5438 err = do_md_run(mddev);
5440 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
5441 do_md_stop(mddev, 0, NULL);
5446 * lets try to run arrays based on all disks that have arrived
5447 * until now. (those are in pending_raid_disks)
5449 * the method: pick the first pending disk, collect all disks with
5450 * the same UUID, remove all from the pending list and put them into
5451 * the 'same_array' list. Then order this list based on superblock
5452 * update time (freshest comes first), kick out 'old' disks and
5453 * compare superblocks. If everything's fine then run it.
5455 * If "unit" is allocated, then bump its reference count
5457 static void autorun_devices(int part)
5459 struct md_rdev *rdev0, *rdev, *tmp;
5460 struct mddev *mddev;
5461 char b[BDEVNAME_SIZE];
5463 printk(KERN_INFO "md: autorun ...\n");
5464 while (!list_empty(&pending_raid_disks)) {
5467 LIST_HEAD(candidates);
5468 rdev0 = list_entry(pending_raid_disks.next,
5469 struct md_rdev, same_set);
5471 printk(KERN_INFO "md: considering %s ...\n",
5472 bdevname(rdev0->bdev,b));
5473 INIT_LIST_HEAD(&candidates);
5474 rdev_for_each_list(rdev, tmp, &pending_raid_disks)
5475 if (super_90_load(rdev, rdev0, 0) >= 0) {
5476 printk(KERN_INFO "md: adding %s ...\n",
5477 bdevname(rdev->bdev,b));
5478 list_move(&rdev->same_set, &candidates);
5481 * now we have a set of devices, with all of them having
5482 * mostly sane superblocks. It's time to allocate the
5486 dev = MKDEV(mdp_major,
5487 rdev0->preferred_minor << MdpMinorShift);
5488 unit = MINOR(dev) >> MdpMinorShift;
5490 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
5493 if (rdev0->preferred_minor != unit) {
5494 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
5495 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
5499 md_probe(dev, NULL, NULL);
5500 mddev = mddev_find(dev);
5501 if (!mddev || !mddev->gendisk) {
5505 "md: cannot allocate memory for md drive.\n");
5508 if (mddev_lock(mddev))
5509 printk(KERN_WARNING "md: %s locked, cannot run\n",
5511 else if (mddev->raid_disks || mddev->major_version
5512 || !list_empty(&mddev->disks)) {
5514 "md: %s already running, cannot run %s\n",
5515 mdname(mddev), bdevname(rdev0->bdev,b));
5516 mddev_unlock(mddev);
5518 printk(KERN_INFO "md: created %s\n", mdname(mddev));
5519 mddev->persistent = 1;
5520 rdev_for_each_list(rdev, tmp, &candidates) {
5521 list_del_init(&rdev->same_set);
5522 if (bind_rdev_to_array(rdev, mddev))
5525 autorun_array(mddev);
5526 mddev_unlock(mddev);
5528 /* on success, candidates will be empty, on error
5531 rdev_for_each_list(rdev, tmp, &candidates) {
5532 list_del_init(&rdev->same_set);
5537 printk(KERN_INFO "md: ... autorun DONE.\n");
5539 #endif /* !MODULE */
5541 static int get_version(void __user * arg)
5545 ver.major = MD_MAJOR_VERSION;
5546 ver.minor = MD_MINOR_VERSION;
5547 ver.patchlevel = MD_PATCHLEVEL_VERSION;
5549 if (copy_to_user(arg, &ver, sizeof(ver)))
5555 static int get_array_info(struct mddev * mddev, void __user * arg)
5557 mdu_array_info_t info;
5558 int nr,working,insync,failed,spare;
5559 struct md_rdev *rdev;
5561 nr = working = insync = failed = spare = 0;
5563 rdev_for_each_rcu(rdev, mddev) {
5565 if (test_bit(Faulty, &rdev->flags))
5569 if (test_bit(In_sync, &rdev->flags))
5577 info.major_version = mddev->major_version;
5578 info.minor_version = mddev->minor_version;
5579 info.patch_version = MD_PATCHLEVEL_VERSION;
5580 info.ctime = mddev->ctime;
5581 info.level = mddev->level;
5582 info.size = mddev->dev_sectors / 2;
5583 if (info.size != mddev->dev_sectors / 2) /* overflow */
5586 info.raid_disks = mddev->raid_disks;
5587 info.md_minor = mddev->md_minor;
5588 info.not_persistent= !mddev->persistent;
5590 info.utime = mddev->utime;
5593 info.state = (1<<MD_SB_CLEAN);
5594 if (mddev->bitmap && mddev->bitmap_info.offset)
5595 info.state |= (1<<MD_SB_BITMAP_PRESENT);
5596 info.active_disks = insync;
5597 info.working_disks = working;
5598 info.failed_disks = failed;
5599 info.spare_disks = spare;
5601 info.layout = mddev->layout;
5602 info.chunk_size = mddev->chunk_sectors << 9;
5604 if (copy_to_user(arg, &info, sizeof(info)))
5610 static int get_bitmap_file(struct mddev * mddev, void __user * arg)
5612 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
5613 char *ptr, *buf = NULL;
5616 file = kmalloc(sizeof(*file), GFP_NOIO);
5621 /* bitmap disabled, zero the first byte and copy out */
5622 if (!mddev->bitmap || !mddev->bitmap->storage.file) {
5623 file->pathname[0] = '\0';
5627 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
5631 ptr = d_path(&mddev->bitmap->storage.file->f_path,
5632 buf, sizeof(file->pathname));
5636 strcpy(file->pathname, ptr);
5640 if (copy_to_user(arg, file, sizeof(*file)))
5648 static int get_disk_info(struct mddev * mddev, void __user * arg)
5650 mdu_disk_info_t info;
5651 struct md_rdev *rdev;
5653 if (copy_from_user(&info, arg, sizeof(info)))
5657 rdev = find_rdev_nr_rcu(mddev, info.number);
5659 info.major = MAJOR(rdev->bdev->bd_dev);
5660 info.minor = MINOR(rdev->bdev->bd_dev);
5661 info.raid_disk = rdev->raid_disk;
5663 if (test_bit(Faulty, &rdev->flags))
5664 info.state |= (1<<MD_DISK_FAULTY);
5665 else if (test_bit(In_sync, &rdev->flags)) {
5666 info.state |= (1<<MD_DISK_ACTIVE);
5667 info.state |= (1<<MD_DISK_SYNC);
5669 if (test_bit(WriteMostly, &rdev->flags))
5670 info.state |= (1<<MD_DISK_WRITEMOSTLY);
5672 info.major = info.minor = 0;
5673 info.raid_disk = -1;
5674 info.state = (1<<MD_DISK_REMOVED);
5678 if (copy_to_user(arg, &info, sizeof(info)))
5684 static int add_new_disk(struct mddev * mddev, mdu_disk_info_t *info)
5686 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
5687 struct md_rdev *rdev;
5688 dev_t dev = MKDEV(info->major,info->minor);
5690 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
5693 if (!mddev->raid_disks) {
5695 /* expecting a device which has a superblock */
5696 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
5699 "md: md_import_device returned %ld\n",
5701 return PTR_ERR(rdev);
5703 if (!list_empty(&mddev->disks)) {
5704 struct md_rdev *rdev0
5705 = list_entry(mddev->disks.next,
5706 struct md_rdev, same_set);
5707 err = super_types[mddev->major_version]
5708 .load_super(rdev, rdev0, mddev->minor_version);
5711 "md: %s has different UUID to %s\n",
5712 bdevname(rdev->bdev,b),
5713 bdevname(rdev0->bdev,b2));
5718 err = bind_rdev_to_array(rdev, mddev);
5725 * add_new_disk can be used once the array is assembled
5726 * to add "hot spares". They must already have a superblock
5731 if (!mddev->pers->hot_add_disk) {
5733 "%s: personality does not support diskops!\n",
5737 if (mddev->persistent)
5738 rdev = md_import_device(dev, mddev->major_version,
5739 mddev->minor_version);
5741 rdev = md_import_device(dev, -1, -1);
5744 "md: md_import_device returned %ld\n",
5746 return PTR_ERR(rdev);
5748 /* set saved_raid_disk if appropriate */
5749 if (!mddev->persistent) {
5750 if (info->state & (1<<MD_DISK_SYNC) &&
5751 info->raid_disk < mddev->raid_disks) {
5752 rdev->raid_disk = info->raid_disk;
5753 set_bit(In_sync, &rdev->flags);
5754 clear_bit(Bitmap_sync, &rdev->flags);
5756 rdev->raid_disk = -1;
5757 rdev->saved_raid_disk = rdev->raid_disk;
5759 super_types[mddev->major_version].
5760 validate_super(mddev, rdev);
5761 if ((info->state & (1<<MD_DISK_SYNC)) &&
5762 rdev->raid_disk != info->raid_disk) {
5763 /* This was a hot-add request, but events doesn't
5764 * match, so reject it.
5770 clear_bit(In_sync, &rdev->flags); /* just to be sure */
5771 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
5772 set_bit(WriteMostly, &rdev->flags);
5774 clear_bit(WriteMostly, &rdev->flags);
5776 rdev->raid_disk = -1;
5777 err = bind_rdev_to_array(rdev, mddev);
5778 if (!err && !mddev->pers->hot_remove_disk) {
5779 /* If there is hot_add_disk but no hot_remove_disk
5780 * then added disks for geometry changes,
5781 * and should be added immediately.
5783 super_types[mddev->major_version].
5784 validate_super(mddev, rdev);
5785 err = mddev->pers->hot_add_disk(mddev, rdev);
5787 unbind_rdev_from_array(rdev);
5792 sysfs_notify_dirent_safe(rdev->sysfs_state);
5794 set_bit(MD_CHANGE_DEVS, &mddev->flags);
5795 if (mddev->degraded)
5796 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
5797 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5799 md_new_event(mddev);
5800 md_wakeup_thread(mddev->thread);
5804 /* otherwise, add_new_disk is only allowed
5805 * for major_version==0 superblocks
5807 if (mddev->major_version != 0) {
5808 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
5813 if (!(info->state & (1<<MD_DISK_FAULTY))) {
5815 rdev = md_import_device(dev, -1, 0);
5818 "md: error, md_import_device() returned %ld\n",
5820 return PTR_ERR(rdev);
5822 rdev->desc_nr = info->number;
5823 if (info->raid_disk < mddev->raid_disks)
5824 rdev->raid_disk = info->raid_disk;
5826 rdev->raid_disk = -1;
5828 if (rdev->raid_disk < mddev->raid_disks)
5829 if (info->state & (1<<MD_DISK_SYNC))
5830 set_bit(In_sync, &rdev->flags);
5832 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
5833 set_bit(WriteMostly, &rdev->flags);
5835 if (!mddev->persistent) {
5836 printk(KERN_INFO "md: nonpersistent superblock ...\n");
5837 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
5839 rdev->sb_start = calc_dev_sboffset(rdev);
5840 rdev->sectors = rdev->sb_start;
5842 err = bind_rdev_to_array(rdev, mddev);
5852 static int hot_remove_disk(struct mddev * mddev, dev_t dev)
5854 char b[BDEVNAME_SIZE];
5855 struct md_rdev *rdev;
5857 rdev = find_rdev(mddev, dev);
5861 clear_bit(Blocked, &rdev->flags);
5862 remove_and_add_spares(mddev, rdev);
5864 if (rdev->raid_disk >= 0)
5867 kick_rdev_from_array(rdev);
5868 md_update_sb(mddev, 1);
5869 md_new_event(mddev);
5873 printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n",
5874 bdevname(rdev->bdev,b), mdname(mddev));
5878 static int hot_add_disk(struct mddev * mddev, dev_t dev)
5880 char b[BDEVNAME_SIZE];
5882 struct md_rdev *rdev;
5887 if (mddev->major_version != 0) {
5888 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
5889 " version-0 superblocks.\n",
5893 if (!mddev->pers->hot_add_disk) {
5895 "%s: personality does not support diskops!\n",
5900 rdev = md_import_device(dev, -1, 0);
5903 "md: error, md_import_device() returned %ld\n",
5908 if (mddev->persistent)
5909 rdev->sb_start = calc_dev_sboffset(rdev);
5911 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
5913 rdev->sectors = rdev->sb_start;
5915 if (test_bit(Faulty, &rdev->flags)) {
5917 "md: can not hot-add faulty %s disk to %s!\n",
5918 bdevname(rdev->bdev,b), mdname(mddev));
5922 clear_bit(In_sync, &rdev->flags);
5924 rdev->saved_raid_disk = -1;
5925 err = bind_rdev_to_array(rdev, mddev);
5930 * The rest should better be atomic, we can have disk failures
5931 * noticed in interrupt contexts ...
5934 rdev->raid_disk = -1;
5936 md_update_sb(mddev, 1);
5939 * Kick recovery, maybe this spare has to be added to the
5940 * array immediately.
5942 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5943 md_wakeup_thread(mddev->thread);
5944 md_new_event(mddev);
5952 static int set_bitmap_file(struct mddev *mddev, int fd)
5957 if (!mddev->pers->quiesce || !mddev->thread)
5959 if (mddev->recovery || mddev->sync_thread)
5961 /* we should be able to change the bitmap.. */
5966 struct inode *inode;
5968 return -EEXIST; /* cannot add when bitmap is present */
5969 mddev->bitmap_info.file = fget(fd);
5971 if (mddev->bitmap_info.file == NULL) {
5972 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
5977 inode = mddev->bitmap_info.file->f_mapping->host;
5978 if (!S_ISREG(inode->i_mode)) {
5979 printk(KERN_ERR "%s: error: bitmap file must be a regular file\n",
5982 } else if (!(mddev->bitmap_info.file->f_mode & FMODE_WRITE)) {
5983 printk(KERN_ERR "%s: error: bitmap file must open for write\n",
5986 } else if (atomic_read(&inode->i_writecount) != 1) {
5987 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
5992 fput(mddev->bitmap_info.file);
5993 mddev->bitmap_info.file = NULL;
5996 mddev->bitmap_info.offset = 0; /* file overrides offset */
5997 } else if (mddev->bitmap == NULL)
5998 return -ENOENT; /* cannot remove what isn't there */
6001 mddev->pers->quiesce(mddev, 1);
6003 err = bitmap_create(mddev);
6005 err = bitmap_load(mddev);
6007 if (fd < 0 || err) {
6008 bitmap_destroy(mddev);
6009 fd = -1; /* make sure to put the file */
6011 mddev->pers->quiesce(mddev, 0);
6014 if (mddev->bitmap_info.file)
6015 fput(mddev->bitmap_info.file);
6016 mddev->bitmap_info.file = NULL;
6023 * set_array_info is used two different ways
6024 * The original usage is when creating a new array.
6025 * In this usage, raid_disks is > 0 and it together with
6026 * level, size, not_persistent,layout,chunksize determine the
6027 * shape of the array.
6028 * This will always create an array with a type-0.90.0 superblock.
6029 * The newer usage is when assembling an array.
6030 * In this case raid_disks will be 0, and the major_version field is
6031 * use to determine which style super-blocks are to be found on the devices.
6032 * The minor and patch _version numbers are also kept incase the
6033 * super_block handler wishes to interpret them.
6035 static int set_array_info(struct mddev * mddev, mdu_array_info_t *info)
6038 if (info->raid_disks == 0) {
6039 /* just setting version number for superblock loading */
6040 if (info->major_version < 0 ||
6041 info->major_version >= ARRAY_SIZE(super_types) ||
6042 super_types[info->major_version].name == NULL) {
6043 /* maybe try to auto-load a module? */
6045 "md: superblock version %d not known\n",
6046 info->major_version);
6049 mddev->major_version = info->major_version;
6050 mddev->minor_version = info->minor_version;
6051 mddev->patch_version = info->patch_version;
6052 mddev->persistent = !info->not_persistent;
6053 /* ensure mddev_put doesn't delete this now that there
6054 * is some minimal configuration.
6056 mddev->ctime = get_seconds();
6059 mddev->major_version = MD_MAJOR_VERSION;
6060 mddev->minor_version = MD_MINOR_VERSION;
6061 mddev->patch_version = MD_PATCHLEVEL_VERSION;
6062 mddev->ctime = get_seconds();
6064 mddev->level = info->level;
6065 mddev->clevel[0] = 0;
6066 mddev->dev_sectors = 2 * (sector_t)info->size;
6067 mddev->raid_disks = info->raid_disks;
6068 /* don't set md_minor, it is determined by which /dev/md* was
6071 if (info->state & (1<<MD_SB_CLEAN))
6072 mddev->recovery_cp = MaxSector;
6074 mddev->recovery_cp = 0;
6075 mddev->persistent = ! info->not_persistent;
6076 mddev->external = 0;
6078 mddev->layout = info->layout;
6079 mddev->chunk_sectors = info->chunk_size >> 9;
6081 mddev->max_disks = MD_SB_DISKS;
6083 if (mddev->persistent)
6085 set_bit(MD_CHANGE_DEVS, &mddev->flags);
6087 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
6088 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
6089 mddev->bitmap_info.offset = 0;
6091 mddev->reshape_position = MaxSector;
6094 * Generate a 128 bit UUID
6096 get_random_bytes(mddev->uuid, 16);
6098 mddev->new_level = mddev->level;
6099 mddev->new_chunk_sectors = mddev->chunk_sectors;
6100 mddev->new_layout = mddev->layout;
6101 mddev->delta_disks = 0;
6102 mddev->reshape_backwards = 0;
6107 void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors)
6109 WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__);
6111 if (mddev->external_size)
6114 mddev->array_sectors = array_sectors;
6116 EXPORT_SYMBOL(md_set_array_sectors);
6118 static int update_size(struct mddev *mddev, sector_t num_sectors)
6120 struct md_rdev *rdev;
6122 int fit = (num_sectors == 0);
6124 if (mddev->pers->resize == NULL)
6126 /* The "num_sectors" is the number of sectors of each device that
6127 * is used. This can only make sense for arrays with redundancy.
6128 * linear and raid0 always use whatever space is available. We can only
6129 * consider changing this number if no resync or reconstruction is
6130 * happening, and if the new size is acceptable. It must fit before the
6131 * sb_start or, if that is <data_offset, it must fit before the size
6132 * of each device. If num_sectors is zero, we find the largest size
6135 if (mddev->sync_thread)
6140 rdev_for_each(rdev, mddev) {
6141 sector_t avail = rdev->sectors;
6143 if (fit && (num_sectors == 0 || num_sectors > avail))
6144 num_sectors = avail;
6145 if (avail < num_sectors)
6148 rv = mddev->pers->resize(mddev, num_sectors);
6150 revalidate_disk(mddev->gendisk);
6154 static int update_raid_disks(struct mddev *mddev, int raid_disks)
6157 struct md_rdev *rdev;
6158 /* change the number of raid disks */
6159 if (mddev->pers->check_reshape == NULL)
6163 if (raid_disks <= 0 ||
6164 (mddev->max_disks && raid_disks >= mddev->max_disks))
6166 if (mddev->sync_thread || mddev->reshape_position != MaxSector)
6169 rdev_for_each(rdev, mddev) {
6170 if (mddev->raid_disks < raid_disks &&
6171 rdev->data_offset < rdev->new_data_offset)
6173 if (mddev->raid_disks > raid_disks &&
6174 rdev->data_offset > rdev->new_data_offset)
6178 mddev->delta_disks = raid_disks - mddev->raid_disks;
6179 if (mddev->delta_disks < 0)
6180 mddev->reshape_backwards = 1;
6181 else if (mddev->delta_disks > 0)
6182 mddev->reshape_backwards = 0;
6184 rv = mddev->pers->check_reshape(mddev);
6186 mddev->delta_disks = 0;
6187 mddev->reshape_backwards = 0;
6194 * update_array_info is used to change the configuration of an
6196 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
6197 * fields in the info are checked against the array.
6198 * Any differences that cannot be handled will cause an error.
6199 * Normally, only one change can be managed at a time.
6201 static int update_array_info(struct mddev *mddev, mdu_array_info_t *info)
6207 /* calculate expected state,ignoring low bits */
6208 if (mddev->bitmap && mddev->bitmap_info.offset)
6209 state |= (1 << MD_SB_BITMAP_PRESENT);
6211 if (mddev->major_version != info->major_version ||
6212 mddev->minor_version != info->minor_version ||
6213 /* mddev->patch_version != info->patch_version || */
6214 mddev->ctime != info->ctime ||
6215 mddev->level != info->level ||
6216 /* mddev->layout != info->layout || */
6217 !mddev->persistent != info->not_persistent||
6218 mddev->chunk_sectors != info->chunk_size >> 9 ||
6219 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
6220 ((state^info->state) & 0xfffffe00)
6223 /* Check there is only one change */
6224 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
6226 if (mddev->raid_disks != info->raid_disks)
6228 if (mddev->layout != info->layout)
6230 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT))
6237 if (mddev->layout != info->layout) {
6239 * we don't need to do anything at the md level, the
6240 * personality will take care of it all.
6242 if (mddev->pers->check_reshape == NULL)
6245 mddev->new_layout = info->layout;
6246 rv = mddev->pers->check_reshape(mddev);
6248 mddev->new_layout = mddev->layout;
6252 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
6253 rv = update_size(mddev, (sector_t)info->size * 2);
6255 if (mddev->raid_disks != info->raid_disks)
6256 rv = update_raid_disks(mddev, info->raid_disks);
6258 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
6259 if (mddev->pers->quiesce == NULL || mddev->thread == NULL)
6261 if (mddev->recovery || mddev->sync_thread)
6263 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
6264 /* add the bitmap */
6267 if (mddev->bitmap_info.default_offset == 0)
6269 mddev->bitmap_info.offset =
6270 mddev->bitmap_info.default_offset;
6271 mddev->bitmap_info.space =
6272 mddev->bitmap_info.default_space;
6273 mddev->pers->quiesce(mddev, 1);
6274 rv = bitmap_create(mddev);
6276 rv = bitmap_load(mddev);
6278 bitmap_destroy(mddev);
6279 mddev->pers->quiesce(mddev, 0);
6281 /* remove the bitmap */
6284 if (mddev->bitmap->storage.file)
6286 mddev->pers->quiesce(mddev, 1);
6287 bitmap_destroy(mddev);
6288 mddev->pers->quiesce(mddev, 0);
6289 mddev->bitmap_info.offset = 0;
6292 md_update_sb(mddev, 1);
6296 static int set_disk_faulty(struct mddev *mddev, dev_t dev)
6298 struct md_rdev *rdev;
6301 if (mddev->pers == NULL)
6305 rdev = find_rdev_rcu(mddev, dev);
6309 md_error(mddev, rdev);
6310 if (!test_bit(Faulty, &rdev->flags))
6318 * We have a problem here : there is no easy way to give a CHS
6319 * virtual geometry. We currently pretend that we have a 2 heads
6320 * 4 sectors (with a BIG number of cylinders...). This drives
6321 * dosfs just mad... ;-)
6323 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
6325 struct mddev *mddev = bdev->bd_disk->private_data;
6329 geo->cylinders = mddev->array_sectors / 8;
6333 static inline bool md_ioctl_valid(unsigned int cmd)
6338 case GET_ARRAY_INFO:
6339 case GET_BITMAP_FILE:
6342 case HOT_REMOVE_DISK:
6343 case PRINT_RAID_DEBUG:
6346 case RESTART_ARRAY_RW:
6348 case SET_ARRAY_INFO:
6349 case SET_BITMAP_FILE:
6350 case SET_DISK_FAULTY:
6359 static int md_ioctl(struct block_device *bdev, fmode_t mode,
6360 unsigned int cmd, unsigned long arg)
6363 void __user *argp = (void __user *)arg;
6364 struct mddev *mddev = NULL;
6367 if (!md_ioctl_valid(cmd))
6372 case GET_ARRAY_INFO:
6376 if (!capable(CAP_SYS_ADMIN))
6381 * Commands dealing with the RAID driver but not any
6386 err = get_version(argp);
6389 case PRINT_RAID_DEBUG:
6397 autostart_arrays(arg);
6404 * Commands creating/starting a new array:
6407 mddev = bdev->bd_disk->private_data;
6414 /* Some actions do not requires the mutex */
6416 case GET_ARRAY_INFO:
6417 if (!mddev->raid_disks && !mddev->external)
6420 err = get_array_info(mddev, argp);
6424 if (!mddev->raid_disks && !mddev->external)
6427 err = get_disk_info(mddev, argp);
6430 case SET_DISK_FAULTY:
6431 err = set_disk_faulty(mddev, new_decode_dev(arg));
6435 if (cmd == ADD_NEW_DISK)
6436 /* need to ensure md_delayed_delete() has completed */
6437 flush_workqueue(md_misc_wq);
6439 if (cmd == HOT_REMOVE_DISK)
6440 /* need to ensure recovery thread has run */
6441 wait_event_interruptible_timeout(mddev->sb_wait,
6442 !test_bit(MD_RECOVERY_NEEDED,
6444 msecs_to_jiffies(5000));
6445 if (cmd == STOP_ARRAY || cmd == STOP_ARRAY_RO) {
6446 /* Need to flush page cache, and ensure no-one else opens
6449 mutex_lock(&mddev->open_mutex);
6450 if (mddev->pers && atomic_read(&mddev->openers) > 1) {
6451 mutex_unlock(&mddev->open_mutex);
6455 set_bit(MD_STILL_CLOSED, &mddev->flags);
6456 mutex_unlock(&mddev->open_mutex);
6457 sync_blockdev(bdev);
6459 err = mddev_lock(mddev);
6462 "md: ioctl lock interrupted, reason %d, cmd %d\n",
6467 if (cmd == SET_ARRAY_INFO) {
6468 mdu_array_info_t info;
6470 memset(&info, 0, sizeof(info));
6471 else if (copy_from_user(&info, argp, sizeof(info))) {
6476 err = update_array_info(mddev, &info);
6478 printk(KERN_WARNING "md: couldn't update"
6479 " array info. %d\n", err);
6484 if (!list_empty(&mddev->disks)) {
6486 "md: array %s already has disks!\n",
6491 if (mddev->raid_disks) {
6493 "md: array %s already initialised!\n",
6498 err = set_array_info(mddev, &info);
6500 printk(KERN_WARNING "md: couldn't set"
6501 " array info. %d\n", err);
6508 * Commands querying/configuring an existing array:
6510 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
6511 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
6512 if ((!mddev->raid_disks && !mddev->external)
6513 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
6514 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
6515 && cmd != GET_BITMAP_FILE) {
6521 * Commands even a read-only array can execute:
6524 case GET_BITMAP_FILE:
6525 err = get_bitmap_file(mddev, argp);
6528 case RESTART_ARRAY_RW:
6529 err = restart_array(mddev);
6533 err = do_md_stop(mddev, 0, bdev);
6537 err = md_set_readonly(mddev, bdev);
6540 case HOT_REMOVE_DISK:
6541 err = hot_remove_disk(mddev, new_decode_dev(arg));
6545 /* We can support ADD_NEW_DISK on read-only arrays
6546 * on if we are re-adding a preexisting device.
6547 * So require mddev->pers and MD_DISK_SYNC.
6550 mdu_disk_info_t info;
6551 if (copy_from_user(&info, argp, sizeof(info)))
6553 else if (!(info.state & (1<<MD_DISK_SYNC)))
6554 /* Need to clear read-only for this */
6557 err = add_new_disk(mddev, &info);
6563 if (get_user(ro, (int __user *)(arg))) {
6569 /* if the bdev is going readonly the value of mddev->ro
6570 * does not matter, no writes are coming
6575 /* are we are already prepared for writes? */
6579 /* transitioning to readauto need only happen for
6580 * arrays that call md_write_start
6583 err = restart_array(mddev);
6586 set_disk_ro(mddev->gendisk, 0);
6593 * The remaining ioctls are changing the state of the
6594 * superblock, so we do not allow them on read-only arrays.
6595 * However non-MD ioctls (e.g. get-size) will still come through
6596 * here and hit the 'default' below, so only disallow
6597 * 'md' ioctls, and switch to rw mode if started auto-readonly.
6599 if (_IOC_TYPE(cmd) == MD_MAJOR && mddev->ro && mddev->pers) {
6600 if (mddev->ro == 2) {
6602 sysfs_notify_dirent_safe(mddev->sysfs_state);
6603 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6604 /* mddev_unlock will wake thread */
6605 /* If a device failed while we were read-only, we
6606 * need to make sure the metadata is updated now.
6608 if (test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
6609 mddev_unlock(mddev);
6610 wait_event(mddev->sb_wait,
6611 !test_bit(MD_CHANGE_DEVS, &mddev->flags) &&
6612 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
6613 mddev_lock_nointr(mddev);
6624 mdu_disk_info_t info;
6625 if (copy_from_user(&info, argp, sizeof(info)))
6628 err = add_new_disk(mddev, &info);
6633 err = hot_add_disk(mddev, new_decode_dev(arg));
6637 err = do_md_run(mddev);
6640 case SET_BITMAP_FILE:
6641 err = set_bitmap_file(mddev, (int)arg);
6651 if (mddev->hold_active == UNTIL_IOCTL &&
6653 mddev->hold_active = 0;
6654 mddev_unlock(mddev);
6663 #ifdef CONFIG_COMPAT
6664 static int md_compat_ioctl(struct block_device *bdev, fmode_t mode,
6665 unsigned int cmd, unsigned long arg)
6668 case HOT_REMOVE_DISK:
6670 case SET_DISK_FAULTY:
6671 case SET_BITMAP_FILE:
6672 /* These take in integer arg, do not convert */
6675 arg = (unsigned long)compat_ptr(arg);
6679 return md_ioctl(bdev, mode, cmd, arg);
6681 #endif /* CONFIG_COMPAT */
6683 static int md_open(struct block_device *bdev, fmode_t mode)
6686 * Succeed if we can lock the mddev, which confirms that
6687 * it isn't being stopped right now.
6689 struct mddev *mddev = mddev_find(bdev->bd_dev);
6695 if (mddev->gendisk != bdev->bd_disk) {
6696 /* we are racing with mddev_put which is discarding this
6700 /* Wait until bdev->bd_disk is definitely gone */
6701 flush_workqueue(md_misc_wq);
6702 /* Then retry the open from the top */
6703 return -ERESTARTSYS;
6705 BUG_ON(mddev != bdev->bd_disk->private_data);
6707 if ((err = mutex_lock_interruptible(&mddev->open_mutex)))
6711 atomic_inc(&mddev->openers);
6712 clear_bit(MD_STILL_CLOSED, &mddev->flags);
6713 mutex_unlock(&mddev->open_mutex);
6715 check_disk_change(bdev);
6720 static void md_release(struct gendisk *disk, fmode_t mode)
6722 struct mddev *mddev = disk->private_data;
6725 atomic_dec(&mddev->openers);
6729 static int md_media_changed(struct gendisk *disk)
6731 struct mddev *mddev = disk->private_data;
6733 return mddev->changed;
6736 static int md_revalidate(struct gendisk *disk)
6738 struct mddev *mddev = disk->private_data;
6743 static const struct block_device_operations md_fops =
6745 .owner = THIS_MODULE,
6747 .release = md_release,
6749 #ifdef CONFIG_COMPAT
6750 .compat_ioctl = md_compat_ioctl,
6752 .getgeo = md_getgeo,
6753 .media_changed = md_media_changed,
6754 .revalidate_disk= md_revalidate,
6757 static int md_thread(void * arg)
6759 struct md_thread *thread = arg;
6762 * md_thread is a 'system-thread', it's priority should be very
6763 * high. We avoid resource deadlocks individually in each
6764 * raid personality. (RAID5 does preallocation) We also use RR and
6765 * the very same RT priority as kswapd, thus we will never get
6766 * into a priority inversion deadlock.
6768 * we definitely have to have equal or higher priority than
6769 * bdflush, otherwise bdflush will deadlock if there are too
6770 * many dirty RAID5 blocks.
6773 allow_signal(SIGKILL);
6774 while (!kthread_should_stop()) {
6776 /* We need to wait INTERRUPTIBLE so that
6777 * we don't add to the load-average.
6778 * That means we need to be sure no signals are
6781 if (signal_pending(current))
6782 flush_signals(current);
6784 wait_event_interruptible_timeout
6786 test_bit(THREAD_WAKEUP, &thread->flags)
6787 || kthread_should_stop(),
6790 clear_bit(THREAD_WAKEUP, &thread->flags);
6791 if (!kthread_should_stop())
6792 thread->run(thread);
6798 void md_wakeup_thread(struct md_thread *thread)
6801 pr_debug("md: waking up MD thread %s.\n", thread->tsk->comm);
6802 set_bit(THREAD_WAKEUP, &thread->flags);
6803 wake_up(&thread->wqueue);
6807 struct md_thread *md_register_thread(void (*run) (struct md_thread *),
6808 struct mddev *mddev, const char *name)
6810 struct md_thread *thread;
6812 thread = kzalloc(sizeof(struct md_thread), GFP_KERNEL);
6816 init_waitqueue_head(&thread->wqueue);
6819 thread->mddev = mddev;
6820 thread->timeout = MAX_SCHEDULE_TIMEOUT;
6821 thread->tsk = kthread_run(md_thread, thread,
6823 mdname(thread->mddev),
6825 if (IS_ERR(thread->tsk)) {
6832 void md_unregister_thread(struct md_thread **threadp)
6834 struct md_thread *thread = *threadp;
6837 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
6838 /* Locking ensures that mddev_unlock does not wake_up a
6839 * non-existent thread
6841 spin_lock(&pers_lock);
6843 spin_unlock(&pers_lock);
6845 kthread_stop(thread->tsk);
6849 void md_error(struct mddev *mddev, struct md_rdev *rdev)
6856 if (!rdev || test_bit(Faulty, &rdev->flags))
6859 if (!mddev->pers || !mddev->pers->error_handler)
6861 mddev->pers->error_handler(mddev,rdev);
6862 if (mddev->degraded)
6863 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6864 sysfs_notify_dirent_safe(rdev->sysfs_state);
6865 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6866 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6867 md_wakeup_thread(mddev->thread);
6868 if (mddev->event_work.func)
6869 queue_work(md_misc_wq, &mddev->event_work);
6870 md_new_event_inintr(mddev);
6873 /* seq_file implementation /proc/mdstat */
6875 static void status_unused(struct seq_file *seq)
6878 struct md_rdev *rdev;
6880 seq_printf(seq, "unused devices: ");
6882 list_for_each_entry(rdev, &pending_raid_disks, same_set) {
6883 char b[BDEVNAME_SIZE];
6885 seq_printf(seq, "%s ",
6886 bdevname(rdev->bdev,b));
6889 seq_printf(seq, "<none>");
6891 seq_printf(seq, "\n");
6895 static void status_resync(struct seq_file *seq, struct mddev * mddev)
6897 sector_t max_sectors, resync, res;
6898 unsigned long dt, db;
6901 unsigned int per_milli;
6903 if (mddev->curr_resync <= 3)
6906 resync = mddev->curr_resync
6907 - atomic_read(&mddev->recovery_active);
6909 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
6910 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
6911 max_sectors = mddev->resync_max_sectors;
6913 max_sectors = mddev->dev_sectors;
6916 * Should not happen.
6922 /* Pick 'scale' such that (resync>>scale)*1000 will fit
6923 * in a sector_t, and (max_sectors>>scale) will fit in a
6924 * u32, as those are the requirements for sector_div.
6925 * Thus 'scale' must be at least 10
6928 if (sizeof(sector_t) > sizeof(unsigned long)) {
6929 while ( max_sectors/2 > (1ULL<<(scale+32)))
6932 res = (resync>>scale)*1000;
6933 sector_div(res, (u32)((max_sectors>>scale)+1));
6937 int i, x = per_milli/50, y = 20-x;
6938 seq_printf(seq, "[");
6939 for (i = 0; i < x; i++)
6940 seq_printf(seq, "=");
6941 seq_printf(seq, ">");
6942 for (i = 0; i < y; i++)
6943 seq_printf(seq, ".");
6944 seq_printf(seq, "] ");
6946 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
6947 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
6949 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
6951 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
6952 "resync" : "recovery"))),
6953 per_milli/10, per_milli % 10,
6954 (unsigned long long) resync/2,
6955 (unsigned long long) max_sectors/2);
6958 * dt: time from mark until now
6959 * db: blocks written from mark until now
6960 * rt: remaining time
6962 * rt is a sector_t, so could be 32bit or 64bit.
6963 * So we divide before multiply in case it is 32bit and close
6965 * We scale the divisor (db) by 32 to avoid losing precision
6966 * near the end of resync when the number of remaining sectors
6968 * We then divide rt by 32 after multiplying by db to compensate.
6969 * The '+1' avoids division by zero if db is very small.
6971 dt = ((jiffies - mddev->resync_mark) / HZ);
6973 db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active))
6974 - mddev->resync_mark_cnt;
6976 rt = max_sectors - resync; /* number of remaining sectors */
6977 sector_div(rt, db/32+1);
6981 seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60,
6982 ((unsigned long)rt % 60)/6);
6984 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
6987 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
6989 struct list_head *tmp;
6991 struct mddev *mddev;
6999 spin_lock(&all_mddevs_lock);
7000 list_for_each(tmp,&all_mddevs)
7002 mddev = list_entry(tmp, struct mddev, all_mddevs);
7004 spin_unlock(&all_mddevs_lock);
7007 spin_unlock(&all_mddevs_lock);
7009 return (void*)2;/* tail */
7013 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
7015 struct list_head *tmp;
7016 struct mddev *next_mddev, *mddev = v;
7022 spin_lock(&all_mddevs_lock);
7024 tmp = all_mddevs.next;
7026 tmp = mddev->all_mddevs.next;
7027 if (tmp != &all_mddevs)
7028 next_mddev = mddev_get(list_entry(tmp,struct mddev,all_mddevs));
7030 next_mddev = (void*)2;
7033 spin_unlock(&all_mddevs_lock);
7041 static void md_seq_stop(struct seq_file *seq, void *v)
7043 struct mddev *mddev = v;
7045 if (mddev && v != (void*)1 && v != (void*)2)
7049 static int md_seq_show(struct seq_file *seq, void *v)
7051 struct mddev *mddev = v;
7053 struct md_rdev *rdev;
7055 if (v == (void*)1) {
7056 struct md_personality *pers;
7057 seq_printf(seq, "Personalities : ");
7058 spin_lock(&pers_lock);
7059 list_for_each_entry(pers, &pers_list, list)
7060 seq_printf(seq, "[%s] ", pers->name);
7062 spin_unlock(&pers_lock);
7063 seq_printf(seq, "\n");
7064 seq->poll_event = atomic_read(&md_event_count);
7067 if (v == (void*)2) {
7072 if (mddev_lock(mddev) < 0)
7075 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
7076 seq_printf(seq, "%s : %sactive", mdname(mddev),
7077 mddev->pers ? "" : "in");
7080 seq_printf(seq, " (read-only)");
7082 seq_printf(seq, " (auto-read-only)");
7083 seq_printf(seq, " %s", mddev->pers->name);
7087 rdev_for_each(rdev, mddev) {
7088 char b[BDEVNAME_SIZE];
7089 seq_printf(seq, " %s[%d]",
7090 bdevname(rdev->bdev,b), rdev->desc_nr);
7091 if (test_bit(WriteMostly, &rdev->flags))
7092 seq_printf(seq, "(W)");
7093 if (test_bit(Faulty, &rdev->flags)) {
7094 seq_printf(seq, "(F)");
7097 if (rdev->raid_disk < 0)
7098 seq_printf(seq, "(S)"); /* spare */
7099 if (test_bit(Replacement, &rdev->flags))
7100 seq_printf(seq, "(R)");
7101 sectors += rdev->sectors;
7104 if (!list_empty(&mddev->disks)) {
7106 seq_printf(seq, "\n %llu blocks",
7107 (unsigned long long)
7108 mddev->array_sectors / 2);
7110 seq_printf(seq, "\n %llu blocks",
7111 (unsigned long long)sectors / 2);
7113 if (mddev->persistent) {
7114 if (mddev->major_version != 0 ||
7115 mddev->minor_version != 90) {
7116 seq_printf(seq," super %d.%d",
7117 mddev->major_version,
7118 mddev->minor_version);
7120 } else if (mddev->external)
7121 seq_printf(seq, " super external:%s",
7122 mddev->metadata_type);
7124 seq_printf(seq, " super non-persistent");
7127 mddev->pers->status(seq, mddev);
7128 seq_printf(seq, "\n ");
7129 if (mddev->pers->sync_request) {
7130 if (mddev->curr_resync > 2) {
7131 status_resync(seq, mddev);
7132 seq_printf(seq, "\n ");
7133 } else if (mddev->curr_resync >= 1)
7134 seq_printf(seq, "\tresync=DELAYED\n ");
7135 else if (mddev->recovery_cp < MaxSector)
7136 seq_printf(seq, "\tresync=PENDING\n ");
7139 seq_printf(seq, "\n ");
7141 bitmap_status(seq, mddev->bitmap);
7143 seq_printf(seq, "\n");
7145 mddev_unlock(mddev);
7150 static const struct seq_operations md_seq_ops = {
7151 .start = md_seq_start,
7152 .next = md_seq_next,
7153 .stop = md_seq_stop,
7154 .show = md_seq_show,
7157 static int md_seq_open(struct inode *inode, struct file *file)
7159 struct seq_file *seq;
7162 error = seq_open(file, &md_seq_ops);
7166 seq = file->private_data;
7167 seq->poll_event = atomic_read(&md_event_count);
7171 static int md_unloading;
7172 static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
7174 struct seq_file *seq = filp->private_data;
7178 return POLLIN|POLLRDNORM|POLLERR|POLLPRI;;
7179 poll_wait(filp, &md_event_waiters, wait);
7181 /* always allow read */
7182 mask = POLLIN | POLLRDNORM;
7184 if (seq->poll_event != atomic_read(&md_event_count))
7185 mask |= POLLERR | POLLPRI;
7189 static const struct file_operations md_seq_fops = {
7190 .owner = THIS_MODULE,
7191 .open = md_seq_open,
7193 .llseek = seq_lseek,
7194 .release = seq_release_private,
7195 .poll = mdstat_poll,
7198 int register_md_personality(struct md_personality *p)
7200 spin_lock(&pers_lock);
7201 list_add_tail(&p->list, &pers_list);
7202 printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level);
7203 spin_unlock(&pers_lock);
7207 int unregister_md_personality(struct md_personality *p)
7209 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
7210 spin_lock(&pers_lock);
7211 list_del_init(&p->list);
7212 spin_unlock(&pers_lock);
7216 static int is_mddev_idle(struct mddev *mddev, int init)
7218 struct md_rdev * rdev;
7224 rdev_for_each_rcu(rdev, mddev) {
7225 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
7226 curr_events = (int)part_stat_read(&disk->part0, sectors[0]) +
7227 (int)part_stat_read(&disk->part0, sectors[1]) -
7228 atomic_read(&disk->sync_io);
7229 /* sync IO will cause sync_io to increase before the disk_stats
7230 * as sync_io is counted when a request starts, and
7231 * disk_stats is counted when it completes.
7232 * So resync activity will cause curr_events to be smaller than
7233 * when there was no such activity.
7234 * non-sync IO will cause disk_stat to increase without
7235 * increasing sync_io so curr_events will (eventually)
7236 * be larger than it was before. Once it becomes
7237 * substantially larger, the test below will cause
7238 * the array to appear non-idle, and resync will slow
7240 * If there is a lot of outstanding resync activity when
7241 * we set last_event to curr_events, then all that activity
7242 * completing might cause the array to appear non-idle
7243 * and resync will be slowed down even though there might
7244 * not have been non-resync activity. This will only
7245 * happen once though. 'last_events' will soon reflect
7246 * the state where there is little or no outstanding
7247 * resync requests, and further resync activity will
7248 * always make curr_events less than last_events.
7251 if (init || curr_events - rdev->last_events > 64) {
7252 rdev->last_events = curr_events;
7260 void md_done_sync(struct mddev *mddev, int blocks, int ok)
7262 /* another "blocks" (512byte) blocks have been synced */
7263 atomic_sub(blocks, &mddev->recovery_active);
7264 wake_up(&mddev->recovery_wait);
7266 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7267 set_bit(MD_RECOVERY_ERROR, &mddev->recovery);
7268 md_wakeup_thread(mddev->thread);
7269 // stop recovery, signal do_sync ....
7274 /* md_write_start(mddev, bi)
7275 * If we need to update some array metadata (e.g. 'active' flag
7276 * in superblock) before writing, schedule a superblock update
7277 * and wait for it to complete.
7279 void md_write_start(struct mddev *mddev, struct bio *bi)
7282 if (bio_data_dir(bi) != WRITE)
7285 BUG_ON(mddev->ro == 1);
7286 if (mddev->ro == 2) {
7287 /* need to switch to read/write */
7289 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7290 md_wakeup_thread(mddev->thread);
7291 md_wakeup_thread(mddev->sync_thread);
7294 atomic_inc(&mddev->writes_pending);
7295 if (mddev->safemode == 1)
7296 mddev->safemode = 0;
7297 if (mddev->in_sync) {
7298 spin_lock_irq(&mddev->write_lock);
7299 if (mddev->in_sync) {
7301 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
7302 set_bit(MD_CHANGE_PENDING, &mddev->flags);
7303 md_wakeup_thread(mddev->thread);
7306 spin_unlock_irq(&mddev->write_lock);
7309 sysfs_notify_dirent_safe(mddev->sysfs_state);
7310 wait_event(mddev->sb_wait,
7311 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
7314 void md_write_end(struct mddev *mddev)
7316 if (atomic_dec_and_test(&mddev->writes_pending)) {
7317 if (mddev->safemode == 2)
7318 md_wakeup_thread(mddev->thread);
7319 else if (mddev->safemode_delay)
7320 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
7324 /* md_allow_write(mddev)
7325 * Calling this ensures that the array is marked 'active' so that writes
7326 * may proceed without blocking. It is important to call this before
7327 * attempting a GFP_KERNEL allocation while holding the mddev lock.
7328 * Must be called with mddev_lock held.
7330 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
7331 * is dropped, so return -EAGAIN after notifying userspace.
7333 int md_allow_write(struct mddev *mddev)
7339 if (!mddev->pers->sync_request)
7342 spin_lock_irq(&mddev->write_lock);
7343 if (mddev->in_sync) {
7345 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
7346 set_bit(MD_CHANGE_PENDING, &mddev->flags);
7347 if (mddev->safemode_delay &&
7348 mddev->safemode == 0)
7349 mddev->safemode = 1;
7350 spin_unlock_irq(&mddev->write_lock);
7351 md_update_sb(mddev, 0);
7352 sysfs_notify_dirent_safe(mddev->sysfs_state);
7354 spin_unlock_irq(&mddev->write_lock);
7356 if (test_bit(MD_CHANGE_PENDING, &mddev->flags))
7361 EXPORT_SYMBOL_GPL(md_allow_write);
7363 #define SYNC_MARKS 10
7364 #define SYNC_MARK_STEP (3*HZ)
7365 #define UPDATE_FREQUENCY (5*60*HZ)
7366 void md_do_sync(struct md_thread *thread)
7368 struct mddev *mddev = thread->mddev;
7369 struct mddev *mddev2;
7370 unsigned int currspeed = 0,
7372 sector_t max_sectors,j, io_sectors, recovery_done;
7373 unsigned long mark[SYNC_MARKS];
7374 unsigned long update_time;
7375 sector_t mark_cnt[SYNC_MARKS];
7377 struct list_head *tmp;
7378 sector_t last_check;
7380 struct md_rdev *rdev;
7381 char *desc, *action = NULL;
7382 struct blk_plug plug;
7384 /* just incase thread restarts... */
7385 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
7387 if (mddev->ro) {/* never try to sync a read-only array */
7388 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7392 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
7393 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) {
7394 desc = "data-check";
7396 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
7397 desc = "requested-resync";
7401 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
7406 mddev->last_sync_action = action ?: desc;
7408 /* we overload curr_resync somewhat here.
7409 * 0 == not engaged in resync at all
7410 * 2 == checking that there is no conflict with another sync
7411 * 1 == like 2, but have yielded to allow conflicting resync to
7413 * other == active in resync - this many blocks
7415 * Before starting a resync we must have set curr_resync to
7416 * 2, and then checked that every "conflicting" array has curr_resync
7417 * less than ours. When we find one that is the same or higher
7418 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
7419 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
7420 * This will mean we have to start checking from the beginning again.
7425 mddev->curr_resync = 2;
7428 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
7430 for_each_mddev(mddev2, tmp) {
7431 if (mddev2 == mddev)
7433 if (!mddev->parallel_resync
7434 && mddev2->curr_resync
7435 && match_mddev_units(mddev, mddev2)) {
7437 if (mddev < mddev2 && mddev->curr_resync == 2) {
7438 /* arbitrarily yield */
7439 mddev->curr_resync = 1;
7440 wake_up(&resync_wait);
7442 if (mddev > mddev2 && mddev->curr_resync == 1)
7443 /* no need to wait here, we can wait the next
7444 * time 'round when curr_resync == 2
7447 /* We need to wait 'interruptible' so as not to
7448 * contribute to the load average, and not to
7449 * be caught by 'softlockup'
7451 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
7452 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
7453 mddev2->curr_resync >= mddev->curr_resync) {
7454 printk(KERN_INFO "md: delaying %s of %s"
7455 " until %s has finished (they"
7456 " share one or more physical units)\n",
7457 desc, mdname(mddev), mdname(mddev2));
7459 if (signal_pending(current))
7460 flush_signals(current);
7462 finish_wait(&resync_wait, &wq);
7465 finish_wait(&resync_wait, &wq);
7468 } while (mddev->curr_resync < 2);
7471 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
7472 /* resync follows the size requested by the personality,
7473 * which defaults to physical size, but can be virtual size
7475 max_sectors = mddev->resync_max_sectors;
7476 atomic64_set(&mddev->resync_mismatches, 0);
7477 /* we don't use the checkpoint if there's a bitmap */
7478 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
7479 j = mddev->resync_min;
7480 else if (!mddev->bitmap)
7481 j = mddev->recovery_cp;
7483 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
7484 max_sectors = mddev->resync_max_sectors;
7486 /* recovery follows the physical size of devices */
7487 max_sectors = mddev->dev_sectors;
7490 rdev_for_each_rcu(rdev, mddev)
7491 if (rdev->raid_disk >= 0 &&
7492 !test_bit(Faulty, &rdev->flags) &&
7493 !test_bit(In_sync, &rdev->flags) &&
7494 rdev->recovery_offset < j)
7495 j = rdev->recovery_offset;
7498 /* If there is a bitmap, we need to make sure all
7499 * writes that started before we added a spare
7500 * complete before we start doing a recovery.
7501 * Otherwise the write might complete and (via
7502 * bitmap_endwrite) set a bit in the bitmap after the
7503 * recovery has checked that bit and skipped that
7506 if (mddev->bitmap) {
7507 mddev->pers->quiesce(mddev, 1);
7508 mddev->pers->quiesce(mddev, 0);
7512 printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev));
7513 printk(KERN_INFO "md: minimum _guaranteed_ speed:"
7514 " %d KB/sec/disk.\n", speed_min(mddev));
7515 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
7516 "(but not more than %d KB/sec) for %s.\n",
7517 speed_max(mddev), desc);
7519 is_mddev_idle(mddev, 1); /* this initializes IO event counters */
7522 for (m = 0; m < SYNC_MARKS; m++) {
7524 mark_cnt[m] = io_sectors;
7527 mddev->resync_mark = mark[last_mark];
7528 mddev->resync_mark_cnt = mark_cnt[last_mark];
7531 * Tune reconstruction:
7533 window = 32*(PAGE_SIZE/512);
7534 printk(KERN_INFO "md: using %dk window, over a total of %lluk.\n",
7535 window/2, (unsigned long long)max_sectors/2);
7537 atomic_set(&mddev->recovery_active, 0);
7542 "md: resuming %s of %s from checkpoint.\n",
7543 desc, mdname(mddev));
7544 mddev->curr_resync = j;
7546 mddev->curr_resync = 3; /* no longer delayed */
7547 mddev->curr_resync_completed = j;
7548 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
7549 md_new_event(mddev);
7550 update_time = jiffies;
7552 blk_start_plug(&plug);
7553 while (j < max_sectors) {
7558 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
7559 ((mddev->curr_resync > mddev->curr_resync_completed &&
7560 (mddev->curr_resync - mddev->curr_resync_completed)
7561 > (max_sectors >> 4)) ||
7562 time_after_eq(jiffies, update_time + UPDATE_FREQUENCY) ||
7563 (j - mddev->curr_resync_completed)*2
7564 >= mddev->resync_max - mddev->curr_resync_completed
7566 /* time to update curr_resync_completed */
7567 wait_event(mddev->recovery_wait,
7568 atomic_read(&mddev->recovery_active) == 0);
7569 mddev->curr_resync_completed = j;
7570 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) &&
7571 j > mddev->recovery_cp)
7572 mddev->recovery_cp = j;
7573 update_time = jiffies;
7574 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
7575 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
7578 while (j >= mddev->resync_max &&
7579 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
7580 /* As this condition is controlled by user-space,
7581 * we can block indefinitely, so use '_interruptible'
7582 * to avoid triggering warnings.
7584 flush_signals(current); /* just in case */
7585 wait_event_interruptible(mddev->recovery_wait,
7586 mddev->resync_max > j
7587 || test_bit(MD_RECOVERY_INTR,
7591 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
7594 sectors = mddev->pers->sync_request(mddev, j, &skipped,
7595 currspeed < speed_min(mddev));
7597 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7601 if (!skipped) { /* actual IO requested */
7602 io_sectors += sectors;
7603 atomic_add(sectors, &mddev->recovery_active);
7606 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
7611 mddev->curr_resync = j;
7612 mddev->curr_mark_cnt = io_sectors;
7613 if (last_check == 0)
7614 /* this is the earliest that rebuild will be
7615 * visible in /proc/mdstat
7617 md_new_event(mddev);
7619 if (last_check + window > io_sectors || j == max_sectors)
7622 last_check = io_sectors;
7624 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
7626 int next = (last_mark+1) % SYNC_MARKS;
7628 mddev->resync_mark = mark[next];
7629 mddev->resync_mark_cnt = mark_cnt[next];
7630 mark[next] = jiffies;
7631 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
7635 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
7639 * this loop exits only if either when we are slower than
7640 * the 'hard' speed limit, or the system was IO-idle for
7642 * the system might be non-idle CPU-wise, but we only care
7643 * about not overloading the IO subsystem. (things like an
7644 * e2fsck being done on the RAID array should execute fast)
7648 recovery_done = io_sectors - atomic_read(&mddev->recovery_active);
7649 currspeed = ((unsigned long)(recovery_done - mddev->resync_mark_cnt))/2
7650 /((jiffies-mddev->resync_mark)/HZ +1) +1;
7652 if (currspeed > speed_min(mddev)) {
7653 if ((currspeed > speed_max(mddev)) ||
7654 !is_mddev_idle(mddev, 0)) {
7660 printk(KERN_INFO "md: %s: %s %s.\n",mdname(mddev), desc,
7661 test_bit(MD_RECOVERY_INTR, &mddev->recovery)
7662 ? "interrupted" : "done");
7664 * this also signals 'finished resyncing' to md_stop
7666 blk_finish_plug(&plug);
7667 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
7669 /* tell personality that we are finished */
7670 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
7672 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
7673 mddev->curr_resync > 2) {
7674 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
7675 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
7676 if (mddev->curr_resync >= mddev->recovery_cp) {
7678 "md: checkpointing %s of %s.\n",
7679 desc, mdname(mddev));
7680 if (test_bit(MD_RECOVERY_ERROR,
7682 mddev->recovery_cp =
7683 mddev->curr_resync_completed;
7685 mddev->recovery_cp =
7689 mddev->recovery_cp = MaxSector;
7691 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
7692 mddev->curr_resync = MaxSector;
7694 rdev_for_each_rcu(rdev, mddev)
7695 if (rdev->raid_disk >= 0 &&
7696 mddev->delta_disks >= 0 &&
7697 !test_bit(Faulty, &rdev->flags) &&
7698 !test_bit(In_sync, &rdev->flags) &&
7699 rdev->recovery_offset < mddev->curr_resync)
7700 rdev->recovery_offset = mddev->curr_resync;
7705 set_bit(MD_CHANGE_DEVS, &mddev->flags);
7707 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
7708 /* We completed so min/max setting can be forgotten if used. */
7709 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
7710 mddev->resync_min = 0;
7711 mddev->resync_max = MaxSector;
7712 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
7713 mddev->resync_min = mddev->curr_resync_completed;
7714 mddev->curr_resync = 0;
7715 wake_up(&resync_wait);
7716 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
7717 md_wakeup_thread(mddev->thread);
7720 EXPORT_SYMBOL_GPL(md_do_sync);
7722 static int remove_and_add_spares(struct mddev *mddev,
7723 struct md_rdev *this)
7725 struct md_rdev *rdev;
7729 rdev_for_each(rdev, mddev)
7730 if ((this == NULL || rdev == this) &&
7731 rdev->raid_disk >= 0 &&
7732 !test_bit(Blocked, &rdev->flags) &&
7733 (test_bit(Faulty, &rdev->flags) ||
7734 ! test_bit(In_sync, &rdev->flags)) &&
7735 atomic_read(&rdev->nr_pending)==0) {
7736 if (mddev->pers->hot_remove_disk(
7737 mddev, rdev) == 0) {
7738 sysfs_unlink_rdev(mddev, rdev);
7739 rdev->raid_disk = -1;
7743 if (removed && mddev->kobj.sd)
7744 sysfs_notify(&mddev->kobj, NULL, "degraded");
7749 rdev_for_each(rdev, mddev) {
7750 if (rdev->raid_disk >= 0 &&
7751 !test_bit(In_sync, &rdev->flags) &&
7752 !test_bit(Faulty, &rdev->flags))
7754 if (rdev->raid_disk >= 0)
7756 if (test_bit(Faulty, &rdev->flags))
7759 ! (rdev->saved_raid_disk >= 0 &&
7760 !test_bit(Bitmap_sync, &rdev->flags)))
7763 if (rdev->saved_raid_disk < 0)
7764 rdev->recovery_offset = 0;
7766 hot_add_disk(mddev, rdev) == 0) {
7767 if (sysfs_link_rdev(mddev, rdev))
7768 /* failure here is OK */;
7770 md_new_event(mddev);
7771 set_bit(MD_CHANGE_DEVS, &mddev->flags);
7776 set_bit(MD_CHANGE_DEVS, &mddev->flags);
7781 * This routine is regularly called by all per-raid-array threads to
7782 * deal with generic issues like resync and super-block update.
7783 * Raid personalities that don't have a thread (linear/raid0) do not
7784 * need this as they never do any recovery or update the superblock.
7786 * It does not do any resync itself, but rather "forks" off other threads
7787 * to do that as needed.
7788 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
7789 * "->recovery" and create a thread at ->sync_thread.
7790 * When the thread finishes it sets MD_RECOVERY_DONE
7791 * and wakeups up this thread which will reap the thread and finish up.
7792 * This thread also removes any faulty devices (with nr_pending == 0).
7794 * The overall approach is:
7795 * 1/ if the superblock needs updating, update it.
7796 * 2/ If a recovery thread is running, don't do anything else.
7797 * 3/ If recovery has finished, clean up, possibly marking spares active.
7798 * 4/ If there are any faulty devices, remove them.
7799 * 5/ If array is degraded, try to add spares devices
7800 * 6/ If array has spares or is not in-sync, start a resync thread.
7802 void md_check_recovery(struct mddev *mddev)
7804 if (mddev->suspended)
7808 bitmap_daemon_work(mddev);
7810 if (signal_pending(current)) {
7811 if (mddev->pers->sync_request && !mddev->external) {
7812 printk(KERN_INFO "md: %s in immediate safe mode\n",
7814 mddev->safemode = 2;
7816 flush_signals(current);
7819 if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
7822 (mddev->flags & MD_UPDATE_SB_FLAGS & ~ (1<<MD_CHANGE_PENDING)) ||
7823 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
7824 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
7825 (mddev->external == 0 && mddev->safemode == 1) ||
7826 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
7827 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
7831 if (mddev_trylock(mddev)) {
7835 /* On a read-only array we can:
7836 * - remove failed devices
7837 * - add already-in_sync devices if the array itself
7839 * As we only add devices that are already in-sync,
7840 * we can activate the spares immediately.
7842 remove_and_add_spares(mddev, NULL);
7843 /* There is no thread, but we need to call
7844 * ->spare_active and clear saved_raid_disk
7846 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7847 md_reap_sync_thread(mddev);
7848 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7852 if (!mddev->external) {
7854 spin_lock_irq(&mddev->write_lock);
7855 if (mddev->safemode &&
7856 !atomic_read(&mddev->writes_pending) &&
7858 mddev->recovery_cp == MaxSector) {
7861 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
7863 if (mddev->safemode == 1)
7864 mddev->safemode = 0;
7865 spin_unlock_irq(&mddev->write_lock);
7867 sysfs_notify_dirent_safe(mddev->sysfs_state);
7870 if (mddev->flags & MD_UPDATE_SB_FLAGS)
7871 md_update_sb(mddev, 0);
7873 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
7874 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
7875 /* resync/recovery still happening */
7876 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7879 if (mddev->sync_thread) {
7880 md_reap_sync_thread(mddev);
7883 /* Set RUNNING before clearing NEEDED to avoid
7884 * any transients in the value of "sync_action".
7886 mddev->curr_resync_completed = 0;
7887 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7888 /* Clear some bits that don't mean anything, but
7891 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
7892 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
7894 if (!test_and_clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
7895 test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
7897 /* no recovery is running.
7898 * remove any failed drives, then
7899 * add spares if possible.
7900 * Spares are also removed and re-added, to allow
7901 * the personality to fail the re-add.
7904 if (mddev->reshape_position != MaxSector) {
7905 if (mddev->pers->check_reshape == NULL ||
7906 mddev->pers->check_reshape(mddev) != 0)
7907 /* Cannot proceed */
7909 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
7910 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7911 } else if ((spares = remove_and_add_spares(mddev, NULL))) {
7912 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7913 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
7914 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
7915 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7916 } else if (mddev->recovery_cp < MaxSector) {
7917 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7918 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7919 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
7920 /* nothing to be done ... */
7923 if (mddev->pers->sync_request) {
7925 /* We are adding a device or devices to an array
7926 * which has the bitmap stored on all devices.
7927 * So make sure all bitmap pages get written
7929 bitmap_write_all(mddev->bitmap);
7931 mddev->sync_thread = md_register_thread(md_do_sync,
7934 if (!mddev->sync_thread) {
7935 printk(KERN_ERR "%s: could not start resync"
7938 /* leave the spares where they are, it shouldn't hurt */
7939 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7940 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7941 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
7942 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
7943 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
7945 md_wakeup_thread(mddev->sync_thread);
7946 sysfs_notify_dirent_safe(mddev->sysfs_action);
7947 md_new_event(mddev);
7950 wake_up(&mddev->sb_wait);
7952 if (!mddev->sync_thread) {
7953 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7954 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
7956 if (mddev->sysfs_action)
7957 sysfs_notify_dirent_safe(mddev->sysfs_action);
7959 mddev_unlock(mddev);
7963 void md_reap_sync_thread(struct mddev *mddev)
7965 struct md_rdev *rdev;
7967 /* resync has finished, collect result */
7968 md_unregister_thread(&mddev->sync_thread);
7969 wake_up(&resync_wait);
7970 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
7971 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
7973 /* activate any spares */
7974 if (mddev->pers->spare_active(mddev)) {
7975 sysfs_notify(&mddev->kobj, NULL,
7977 set_bit(MD_CHANGE_DEVS, &mddev->flags);
7980 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
7981 mddev->pers->finish_reshape)
7982 mddev->pers->finish_reshape(mddev);
7984 /* If array is no-longer degraded, then any saved_raid_disk
7985 * information must be scrapped.
7987 if (!mddev->degraded)
7988 rdev_for_each(rdev, mddev)
7989 rdev->saved_raid_disk = -1;
7991 md_update_sb(mddev, 1);
7992 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7993 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7994 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
7995 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
7996 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
7997 /* flag recovery needed just to double check */
7998 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7999 sysfs_notify_dirent_safe(mddev->sysfs_action);
8000 md_new_event(mddev);
8001 if (mddev->event_work.func)
8002 queue_work(md_misc_wq, &mddev->event_work);
8005 void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev)
8007 sysfs_notify_dirent_safe(rdev->sysfs_state);
8008 wait_event_timeout(rdev->blocked_wait,
8009 !test_bit(Blocked, &rdev->flags) &&
8010 !test_bit(BlockedBadBlocks, &rdev->flags),
8011 msecs_to_jiffies(5000));
8012 rdev_dec_pending(rdev, mddev);
8014 EXPORT_SYMBOL(md_wait_for_blocked_rdev);
8016 void md_finish_reshape(struct mddev *mddev)
8018 /* called be personality module when reshape completes. */
8019 struct md_rdev *rdev;
8021 rdev_for_each(rdev, mddev) {
8022 if (rdev->data_offset > rdev->new_data_offset)
8023 rdev->sectors += rdev->data_offset - rdev->new_data_offset;
8025 rdev->sectors -= rdev->new_data_offset - rdev->data_offset;
8026 rdev->data_offset = rdev->new_data_offset;
8029 EXPORT_SYMBOL(md_finish_reshape);
8031 /* Bad block management.
8032 * We can record which blocks on each device are 'bad' and so just
8033 * fail those blocks, or that stripe, rather than the whole device.
8034 * Entries in the bad-block table are 64bits wide. This comprises:
8035 * Length of bad-range, in sectors: 0-511 for lengths 1-512
8036 * Start of bad-range, sector offset, 54 bits (allows 8 exbibytes)
8037 * A 'shift' can be set so that larger blocks are tracked and
8038 * consequently larger devices can be covered.
8039 * 'Acknowledged' flag - 1 bit. - the most significant bit.
8041 * Locking of the bad-block table uses a seqlock so md_is_badblock
8042 * might need to retry if it is very unlucky.
8043 * We will sometimes want to check for bad blocks in a bi_end_io function,
8044 * so we use the write_seqlock_irq variant.
8046 * When looking for a bad block we specify a range and want to
8047 * know if any block in the range is bad. So we binary-search
8048 * to the last range that starts at-or-before the given endpoint,
8049 * (or "before the sector after the target range")
8050 * then see if it ends after the given start.
8052 * 0 if there are no known bad blocks in the range
8053 * 1 if there are known bad block which are all acknowledged
8054 * -1 if there are bad blocks which have not yet been acknowledged in metadata.
8055 * plus the start/length of the first bad section we overlap.
8057 int md_is_badblock(struct badblocks *bb, sector_t s, int sectors,
8058 sector_t *first_bad, int *bad_sectors)
8064 sector_t target = s + sectors;
8067 if (bb->shift > 0) {
8068 /* round the start down, and the end up */
8070 target += (1<<bb->shift) - 1;
8071 target >>= bb->shift;
8072 sectors = target - s;
8074 /* 'target' is now the first block after the bad range */
8077 seq = read_seqbegin(&bb->lock);
8082 /* Binary search between lo and hi for 'target'
8083 * i.e. for the last range that starts before 'target'
8085 /* INVARIANT: ranges before 'lo' and at-or-after 'hi'
8086 * are known not to be the last range before target.
8087 * VARIANT: hi-lo is the number of possible
8088 * ranges, and decreases until it reaches 1
8090 while (hi - lo > 1) {
8091 int mid = (lo + hi) / 2;
8092 sector_t a = BB_OFFSET(p[mid]);
8094 /* This could still be the one, earlier ranges
8098 /* This and later ranges are definitely out. */
8101 /* 'lo' might be the last that started before target, but 'hi' isn't */
8103 /* need to check all range that end after 's' to see if
8104 * any are unacknowledged.
8107 BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) {
8108 if (BB_OFFSET(p[lo]) < target) {
8109 /* starts before the end, and finishes after
8110 * the start, so they must overlap
8112 if (rv != -1 && BB_ACK(p[lo]))
8116 *first_bad = BB_OFFSET(p[lo]);
8117 *bad_sectors = BB_LEN(p[lo]);
8123 if (read_seqretry(&bb->lock, seq))
8128 EXPORT_SYMBOL_GPL(md_is_badblock);
8131 * Add a range of bad blocks to the table.
8132 * This might extend the table, or might contract it
8133 * if two adjacent ranges can be merged.
8134 * We binary-search to find the 'insertion' point, then
8135 * decide how best to handle it.
8137 static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors,
8143 unsigned long flags;
8146 /* badblocks are disabled */
8150 /* round the start down, and the end up */
8151 sector_t next = s + sectors;
8153 next += (1<<bb->shift) - 1;
8158 write_seqlock_irqsave(&bb->lock, flags);
8163 /* Find the last range that starts at-or-before 's' */
8164 while (hi - lo > 1) {
8165 int mid = (lo + hi) / 2;
8166 sector_t a = BB_OFFSET(p[mid]);
8172 if (hi > lo && BB_OFFSET(p[lo]) > s)
8176 /* we found a range that might merge with the start
8179 sector_t a = BB_OFFSET(p[lo]);
8180 sector_t e = a + BB_LEN(p[lo]);
8181 int ack = BB_ACK(p[lo]);
8183 /* Yes, we can merge with a previous range */
8184 if (s == a && s + sectors >= e)
8185 /* new range covers old */
8188 ack = ack && acknowledged;
8190 if (e < s + sectors)
8192 if (e - a <= BB_MAX_LEN) {
8193 p[lo] = BB_MAKE(a, e-a, ack);
8196 /* does not all fit in one range,
8197 * make p[lo] maximal
8199 if (BB_LEN(p[lo]) != BB_MAX_LEN)
8200 p[lo] = BB_MAKE(a, BB_MAX_LEN, ack);
8206 if (sectors && hi < bb->count) {
8207 /* 'hi' points to the first range that starts after 's'.
8208 * Maybe we can merge with the start of that range */
8209 sector_t a = BB_OFFSET(p[hi]);
8210 sector_t e = a + BB_LEN(p[hi]);
8211 int ack = BB_ACK(p[hi]);
8212 if (a <= s + sectors) {
8213 /* merging is possible */
8214 if (e <= s + sectors) {
8219 ack = ack && acknowledged;
8222 if (e - a <= BB_MAX_LEN) {
8223 p[hi] = BB_MAKE(a, e-a, ack);
8226 p[hi] = BB_MAKE(a, BB_MAX_LEN, ack);
8234 if (sectors == 0 && hi < bb->count) {
8235 /* we might be able to combine lo and hi */
8236 /* Note: 's' is at the end of 'lo' */
8237 sector_t a = BB_OFFSET(p[hi]);
8238 int lolen = BB_LEN(p[lo]);
8239 int hilen = BB_LEN(p[hi]);
8240 int newlen = lolen + hilen - (s - a);
8241 if (s >= a && newlen < BB_MAX_LEN) {
8242 /* yes, we can combine them */
8243 int ack = BB_ACK(p[lo]) && BB_ACK(p[hi]);
8244 p[lo] = BB_MAKE(BB_OFFSET(p[lo]), newlen, ack);
8245 memmove(p + hi, p + hi + 1,
8246 (bb->count - hi - 1) * 8);
8251 /* didn't merge (it all).
8252 * Need to add a range just before 'hi' */
8253 if (bb->count >= MD_MAX_BADBLOCKS) {
8254 /* No room for more */
8258 int this_sectors = sectors;
8259 memmove(p + hi + 1, p + hi,
8260 (bb->count - hi) * 8);
8263 if (this_sectors > BB_MAX_LEN)
8264 this_sectors = BB_MAX_LEN;
8265 p[hi] = BB_MAKE(s, this_sectors, acknowledged);
8266 sectors -= this_sectors;
8273 bb->unacked_exist = 1;
8274 write_sequnlock_irqrestore(&bb->lock, flags);
8279 int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
8284 s += rdev->new_data_offset;
8286 s += rdev->data_offset;
8287 rv = md_set_badblocks(&rdev->badblocks,
8290 /* Make sure they get written out promptly */
8291 sysfs_notify_dirent_safe(rdev->sysfs_state);
8292 set_bit(MD_CHANGE_CLEAN, &rdev->mddev->flags);
8293 md_wakeup_thread(rdev->mddev->thread);
8297 EXPORT_SYMBOL_GPL(rdev_set_badblocks);
8300 * Remove a range of bad blocks from the table.
8301 * This may involve extending the table if we spilt a region,
8302 * but it must not fail. So if the table becomes full, we just
8303 * drop the remove request.
8305 static int md_clear_badblocks(struct badblocks *bb, sector_t s, int sectors)
8309 sector_t target = s + sectors;
8312 if (bb->shift > 0) {
8313 /* When clearing we round the start up and the end down.
8314 * This should not matter as the shift should align with
8315 * the block size and no rounding should ever be needed.
8316 * However it is better the think a block is bad when it
8317 * isn't than to think a block is not bad when it is.
8319 s += (1<<bb->shift) - 1;
8321 target >>= bb->shift;
8322 sectors = target - s;
8325 write_seqlock_irq(&bb->lock);
8330 /* Find the last range that starts before 'target' */
8331 while (hi - lo > 1) {
8332 int mid = (lo + hi) / 2;
8333 sector_t a = BB_OFFSET(p[mid]);
8340 /* p[lo] is the last range that could overlap the
8341 * current range. Earlier ranges could also overlap,
8342 * but only this one can overlap the end of the range.
8344 if (BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > target) {
8345 /* Partial overlap, leave the tail of this range */
8346 int ack = BB_ACK(p[lo]);
8347 sector_t a = BB_OFFSET(p[lo]);
8348 sector_t end = a + BB_LEN(p[lo]);
8351 /* we need to split this range */
8352 if (bb->count >= MD_MAX_BADBLOCKS) {
8356 memmove(p+lo+1, p+lo, (bb->count - lo) * 8);
8358 p[lo] = BB_MAKE(a, s-a, ack);
8361 p[lo] = BB_MAKE(target, end - target, ack);
8362 /* there is no longer an overlap */
8367 BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) {
8368 /* This range does overlap */
8369 if (BB_OFFSET(p[lo]) < s) {
8370 /* Keep the early parts of this range. */
8371 int ack = BB_ACK(p[lo]);
8372 sector_t start = BB_OFFSET(p[lo]);
8373 p[lo] = BB_MAKE(start, s - start, ack);
8374 /* now low doesn't overlap, so.. */
8379 /* 'lo' is strictly before, 'hi' is strictly after,
8380 * anything between needs to be discarded
8383 memmove(p+lo+1, p+hi, (bb->count - hi) * 8);
8384 bb->count -= (hi - lo - 1);
8390 write_sequnlock_irq(&bb->lock);
8394 int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
8398 s += rdev->new_data_offset;
8400 s += rdev->data_offset;
8401 return md_clear_badblocks(&rdev->badblocks,
8404 EXPORT_SYMBOL_GPL(rdev_clear_badblocks);
8407 * Acknowledge all bad blocks in a list.
8408 * This only succeeds if ->changed is clear. It is used by
8409 * in-kernel metadata updates
8411 void md_ack_all_badblocks(struct badblocks *bb)
8413 if (bb->page == NULL || bb->changed)
8414 /* no point even trying */
8416 write_seqlock_irq(&bb->lock);
8418 if (bb->changed == 0 && bb->unacked_exist) {
8421 for (i = 0; i < bb->count ; i++) {
8422 if (!BB_ACK(p[i])) {
8423 sector_t start = BB_OFFSET(p[i]);
8424 int len = BB_LEN(p[i]);
8425 p[i] = BB_MAKE(start, len, 1);
8428 bb->unacked_exist = 0;
8430 write_sequnlock_irq(&bb->lock);
8432 EXPORT_SYMBOL_GPL(md_ack_all_badblocks);
8434 /* sysfs access to bad-blocks list.
8435 * We present two files.
8436 * 'bad-blocks' lists sector numbers and lengths of ranges that
8437 * are recorded as bad. The list is truncated to fit within
8438 * the one-page limit of sysfs.
8439 * Writing "sector length" to this file adds an acknowledged
8441 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
8442 * been acknowledged. Writing to this file adds bad blocks
8443 * without acknowledging them. This is largely for testing.
8447 badblocks_show(struct badblocks *bb, char *page, int unack)
8458 seq = read_seqbegin(&bb->lock);
8463 while (len < PAGE_SIZE && i < bb->count) {
8464 sector_t s = BB_OFFSET(p[i]);
8465 unsigned int length = BB_LEN(p[i]);
8466 int ack = BB_ACK(p[i]);
8472 len += snprintf(page+len, PAGE_SIZE-len, "%llu %u\n",
8473 (unsigned long long)s << bb->shift,
8474 length << bb->shift);
8476 if (unack && len == 0)
8477 bb->unacked_exist = 0;
8479 if (read_seqretry(&bb->lock, seq))
8488 badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack)
8490 unsigned long long sector;
8494 /* Allow clearing via sysfs *only* for testing/debugging.
8495 * Normally only a successful write may clear a badblock
8498 if (page[0] == '-') {
8502 #endif /* DO_DEBUG */
8504 switch (sscanf(page, "%llu %d%c", §or, &length, &newline)) {
8506 if (newline != '\n')
8518 md_clear_badblocks(bb, sector, length);
8521 #endif /* DO_DEBUG */
8522 if (md_set_badblocks(bb, sector, length, !unack))
8528 static int md_notify_reboot(struct notifier_block *this,
8529 unsigned long code, void *x)
8531 struct list_head *tmp;
8532 struct mddev *mddev;
8535 for_each_mddev(mddev, tmp) {
8536 if (mddev_trylock(mddev)) {
8538 __md_stop_writes(mddev);
8539 if (mddev->persistent)
8540 mddev->safemode = 2;
8541 mddev_unlock(mddev);
8546 * certain more exotic SCSI devices are known to be
8547 * volatile wrt too early system reboots. While the
8548 * right place to handle this issue is the given
8549 * driver, we do want to have a safe RAID driver ...
8557 static struct notifier_block md_notifier = {
8558 .notifier_call = md_notify_reboot,
8560 .priority = INT_MAX, /* before any real devices */
8563 static void md_geninit(void)
8565 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
8567 proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops);
8570 static int __init md_init(void)
8574 md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0);
8578 md_misc_wq = alloc_workqueue("md_misc", 0, 0);
8582 if ((ret = register_blkdev(MD_MAJOR, "md")) < 0)
8585 if ((ret = register_blkdev(0, "mdp")) < 0)
8589 blk_register_region(MKDEV(MD_MAJOR, 0), 512, THIS_MODULE,
8590 md_probe, NULL, NULL);
8591 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
8592 md_probe, NULL, NULL);
8594 register_reboot_notifier(&md_notifier);
8595 raid_table_header = register_sysctl_table(raid_root_table);
8601 unregister_blkdev(MD_MAJOR, "md");
8603 destroy_workqueue(md_misc_wq);
8605 destroy_workqueue(md_wq);
8613 * Searches all registered partitions for autorun RAID arrays
8617 static LIST_HEAD(all_detected_devices);
8618 struct detected_devices_node {
8619 struct list_head list;
8623 void md_autodetect_dev(dev_t dev)
8625 struct detected_devices_node *node_detected_dev;
8627 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
8628 if (node_detected_dev) {
8629 node_detected_dev->dev = dev;
8630 list_add_tail(&node_detected_dev->list, &all_detected_devices);
8632 printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed"
8633 ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev));
8638 static void autostart_arrays(int part)
8640 struct md_rdev *rdev;
8641 struct detected_devices_node *node_detected_dev;
8643 int i_scanned, i_passed;
8648 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
8650 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
8652 node_detected_dev = list_entry(all_detected_devices.next,
8653 struct detected_devices_node, list);
8654 list_del(&node_detected_dev->list);
8655 dev = node_detected_dev->dev;
8656 kfree(node_detected_dev);
8657 rdev = md_import_device(dev,0, 90);
8661 if (test_bit(Faulty, &rdev->flags)) {
8665 set_bit(AutoDetected, &rdev->flags);
8666 list_add(&rdev->same_set, &pending_raid_disks);
8670 printk(KERN_INFO "md: Scanned %d and added %d devices.\n",
8671 i_scanned, i_passed);
8673 autorun_devices(part);
8676 #endif /* !MODULE */
8678 static __exit void md_exit(void)
8680 struct mddev *mddev;
8681 struct list_head *tmp;
8684 blk_unregister_region(MKDEV(MD_MAJOR,0), 512);
8685 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
8687 unregister_blkdev(MD_MAJOR,"md");
8688 unregister_blkdev(mdp_major, "mdp");
8689 unregister_reboot_notifier(&md_notifier);
8690 unregister_sysctl_table(raid_table_header);
8692 /* We cannot unload the modules while some process is
8693 * waiting for us in select() or poll() - wake them up
8696 while (waitqueue_active(&md_event_waiters)) {
8697 /* not safe to leave yet */
8698 wake_up(&md_event_waiters);
8702 remove_proc_entry("mdstat", NULL);
8704 for_each_mddev(mddev, tmp) {
8705 export_array(mddev);
8706 mddev->hold_active = 0;
8708 destroy_workqueue(md_misc_wq);
8709 destroy_workqueue(md_wq);
8712 subsys_initcall(md_init);
8713 module_exit(md_exit)
8715 static int get_ro(char *buffer, struct kernel_param *kp)
8717 return sprintf(buffer, "%d", start_readonly);
8719 static int set_ro(const char *val, struct kernel_param *kp)
8722 int num = simple_strtoul(val, &e, 10);
8723 if (*val && (*e == '\0' || *e == '\n')) {
8724 start_readonly = num;
8730 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
8731 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
8733 module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR);
8735 EXPORT_SYMBOL(register_md_personality);
8736 EXPORT_SYMBOL(unregister_md_personality);
8737 EXPORT_SYMBOL(md_error);
8738 EXPORT_SYMBOL(md_done_sync);
8739 EXPORT_SYMBOL(md_write_start);
8740 EXPORT_SYMBOL(md_write_end);
8741 EXPORT_SYMBOL(md_register_thread);
8742 EXPORT_SYMBOL(md_unregister_thread);
8743 EXPORT_SYMBOL(md_wakeup_thread);
8744 EXPORT_SYMBOL(md_check_recovery);
8745 EXPORT_SYMBOL(md_reap_sync_thread);
8746 MODULE_LICENSE("GPL");
8747 MODULE_DESCRIPTION("MD RAID framework");
8749 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);