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/badblocks.h>
38 #include <linux/sysctl.h>
39 #include <linux/seq_file.h>
41 #include <linux/poll.h>
42 #include <linux/ctype.h>
43 #include <linux/string.h>
44 #include <linux/hdreg.h>
45 #include <linux/proc_fs.h>
46 #include <linux/random.h>
47 #include <linux/module.h>
48 #include <linux/reboot.h>
49 #include <linux/file.h>
50 #include <linux/compat.h>
51 #include <linux/delay.h>
52 #include <linux/raid/md_p.h>
53 #include <linux/raid/md_u.h>
54 #include <linux/slab.h>
57 #include "md-cluster.h"
60 static void autostart_arrays(int part);
63 /* pers_list is a list of registered personalities protected
65 * pers_lock does extra service to protect accesses to
66 * mddev->thread when the mutex cannot be held.
68 static LIST_HEAD(pers_list);
69 static DEFINE_SPINLOCK(pers_lock);
71 struct md_cluster_operations *md_cluster_ops;
72 EXPORT_SYMBOL(md_cluster_ops);
73 struct module *md_cluster_mod;
74 EXPORT_SYMBOL(md_cluster_mod);
76 static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
77 static struct workqueue_struct *md_wq;
78 static struct workqueue_struct *md_misc_wq;
80 static int remove_and_add_spares(struct mddev *mddev,
81 struct md_rdev *this);
82 static void mddev_detach(struct mddev *mddev);
85 * Default number of read corrections we'll attempt on an rdev
86 * before ejecting it from the array. We divide the read error
87 * count by 2 for every hour elapsed between read errors.
89 #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
91 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
92 * is 1000 KB/sec, so the extra system load does not show up that much.
93 * Increase it if you want to have more _guaranteed_ speed. Note that
94 * the RAID driver will use the maximum available bandwidth if the IO
95 * subsystem is idle. There is also an 'absolute maximum' reconstruction
96 * speed limit - in case reconstruction slows down your system despite
99 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
100 * or /sys/block/mdX/md/sync_speed_{min,max}
103 static int sysctl_speed_limit_min = 1000;
104 static int sysctl_speed_limit_max = 200000;
105 static inline int speed_min(struct mddev *mddev)
107 return mddev->sync_speed_min ?
108 mddev->sync_speed_min : sysctl_speed_limit_min;
111 static inline int speed_max(struct mddev *mddev)
113 return mddev->sync_speed_max ?
114 mddev->sync_speed_max : sysctl_speed_limit_max;
117 static struct ctl_table_header *raid_table_header;
119 static struct ctl_table raid_table[] = {
121 .procname = "speed_limit_min",
122 .data = &sysctl_speed_limit_min,
123 .maxlen = sizeof(int),
124 .mode = S_IRUGO|S_IWUSR,
125 .proc_handler = proc_dointvec,
128 .procname = "speed_limit_max",
129 .data = &sysctl_speed_limit_max,
130 .maxlen = sizeof(int),
131 .mode = S_IRUGO|S_IWUSR,
132 .proc_handler = proc_dointvec,
137 static struct ctl_table raid_dir_table[] = {
141 .mode = S_IRUGO|S_IXUGO,
147 static struct ctl_table raid_root_table[] = {
152 .child = raid_dir_table,
157 static const struct block_device_operations md_fops;
159 static int start_readonly;
162 * like bio_clone, but with a local bio set
165 struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs,
170 if (!mddev || !mddev->bio_set)
171 return bio_alloc(gfp_mask, nr_iovecs);
173 b = bio_alloc_bioset(gfp_mask, nr_iovecs, mddev->bio_set);
178 EXPORT_SYMBOL_GPL(bio_alloc_mddev);
180 struct bio *bio_clone_mddev(struct bio *bio, gfp_t gfp_mask,
183 if (!mddev || !mddev->bio_set)
184 return bio_clone(bio, gfp_mask);
186 return bio_clone_bioset(bio, gfp_mask, mddev->bio_set);
188 EXPORT_SYMBOL_GPL(bio_clone_mddev);
191 * We have a system wide 'event count' that is incremented
192 * on any 'interesting' event, and readers of /proc/mdstat
193 * can use 'poll' or 'select' to find out when the event
197 * start array, stop array, error, add device, remove device,
198 * start build, activate spare
200 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
201 static atomic_t md_event_count;
202 void md_new_event(struct mddev *mddev)
204 atomic_inc(&md_event_count);
205 wake_up(&md_event_waiters);
207 EXPORT_SYMBOL_GPL(md_new_event);
209 /* Alternate version that can be called from interrupts
210 * when calling sysfs_notify isn't needed.
212 static void md_new_event_inintr(struct mddev *mddev)
214 atomic_inc(&md_event_count);
215 wake_up(&md_event_waiters);
219 * Enables to iterate over all existing md arrays
220 * all_mddevs_lock protects this list.
222 static LIST_HEAD(all_mddevs);
223 static DEFINE_SPINLOCK(all_mddevs_lock);
226 * iterates through all used mddevs in the system.
227 * We take care to grab the all_mddevs_lock whenever navigating
228 * the list, and to always hold a refcount when unlocked.
229 * Any code which breaks out of this loop while own
230 * a reference to the current mddev and must mddev_put it.
232 #define for_each_mddev(_mddev,_tmp) \
234 for (({ spin_lock(&all_mddevs_lock); \
235 _tmp = all_mddevs.next; \
237 ({ if (_tmp != &all_mddevs) \
238 mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\
239 spin_unlock(&all_mddevs_lock); \
240 if (_mddev) mddev_put(_mddev); \
241 _mddev = list_entry(_tmp, struct mddev, all_mddevs); \
242 _tmp != &all_mddevs;}); \
243 ({ spin_lock(&all_mddevs_lock); \
244 _tmp = _tmp->next;}) \
247 /* Rather than calling directly into the personality make_request function,
248 * IO requests come here first so that we can check if the device is
249 * being suspended pending a reconfiguration.
250 * We hold a refcount over the call to ->make_request. By the time that
251 * call has finished, the bio has been linked into some internal structure
252 * and so is visible to ->quiesce(), so we don't need the refcount any more.
254 static blk_qc_t md_make_request(struct request_queue *q, struct bio *bio)
256 const int rw = bio_data_dir(bio);
257 struct mddev *mddev = q->queuedata;
258 unsigned int sectors;
261 blk_queue_split(q, &bio, q->bio_split);
263 if (mddev == NULL || mddev->pers == NULL
266 return BLK_QC_T_NONE;
268 if (mddev->ro == 1 && unlikely(rw == WRITE)) {
269 if (bio_sectors(bio) != 0)
270 bio->bi_error = -EROFS;
272 return BLK_QC_T_NONE;
274 smp_rmb(); /* Ensure implications of 'active' are visible */
276 if (mddev->suspended) {
279 prepare_to_wait(&mddev->sb_wait, &__wait,
280 TASK_UNINTERRUPTIBLE);
281 if (!mddev->suspended)
287 finish_wait(&mddev->sb_wait, &__wait);
289 atomic_inc(&mddev->active_io);
293 * save the sectors now since our bio can
294 * go away inside make_request
296 sectors = bio_sectors(bio);
297 mddev->pers->make_request(mddev, bio);
299 cpu = part_stat_lock();
300 part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]);
301 part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw], sectors);
304 if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended)
305 wake_up(&mddev->sb_wait);
307 return BLK_QC_T_NONE;
310 /* mddev_suspend makes sure no new requests are submitted
311 * to the device, and that any requests that have been submitted
312 * are completely handled.
313 * Once mddev_detach() is called and completes, the module will be
316 void mddev_suspend(struct mddev *mddev)
318 BUG_ON(mddev->suspended);
319 mddev->suspended = 1;
321 wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0);
322 mddev->pers->quiesce(mddev, 1);
324 del_timer_sync(&mddev->safemode_timer);
326 EXPORT_SYMBOL_GPL(mddev_suspend);
328 void mddev_resume(struct mddev *mddev)
330 mddev->suspended = 0;
331 wake_up(&mddev->sb_wait);
332 mddev->pers->quiesce(mddev, 0);
334 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
335 md_wakeup_thread(mddev->thread);
336 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
338 EXPORT_SYMBOL_GPL(mddev_resume);
340 int mddev_congested(struct mddev *mddev, int bits)
342 struct md_personality *pers = mddev->pers;
346 if (mddev->suspended)
348 else if (pers && pers->congested)
349 ret = pers->congested(mddev, bits);
353 EXPORT_SYMBOL_GPL(mddev_congested);
354 static int md_congested(void *data, int bits)
356 struct mddev *mddev = data;
357 return mddev_congested(mddev, bits);
361 * Generic flush handling for md
364 static void md_end_flush(struct bio *bio)
366 struct md_rdev *rdev = bio->bi_private;
367 struct mddev *mddev = rdev->mddev;
369 rdev_dec_pending(rdev, mddev);
371 if (atomic_dec_and_test(&mddev->flush_pending)) {
372 /* The pre-request flush has finished */
373 queue_work(md_wq, &mddev->flush_work);
378 static void md_submit_flush_data(struct work_struct *ws);
380 static void submit_flushes(struct work_struct *ws)
382 struct mddev *mddev = container_of(ws, struct mddev, flush_work);
383 struct md_rdev *rdev;
385 INIT_WORK(&mddev->flush_work, md_submit_flush_data);
386 atomic_set(&mddev->flush_pending, 1);
388 rdev_for_each_rcu(rdev, mddev)
389 if (rdev->raid_disk >= 0 &&
390 !test_bit(Faulty, &rdev->flags)) {
391 /* Take two references, one is dropped
392 * when request finishes, one after
393 * we reclaim rcu_read_lock
396 atomic_inc(&rdev->nr_pending);
397 atomic_inc(&rdev->nr_pending);
399 bi = bio_alloc_mddev(GFP_NOIO, 0, mddev);
400 bi->bi_end_io = md_end_flush;
401 bi->bi_private = rdev;
402 bi->bi_bdev = rdev->bdev;
403 atomic_inc(&mddev->flush_pending);
404 submit_bio(WRITE_FLUSH, bi);
406 rdev_dec_pending(rdev, mddev);
409 if (atomic_dec_and_test(&mddev->flush_pending))
410 queue_work(md_wq, &mddev->flush_work);
413 static void md_submit_flush_data(struct work_struct *ws)
415 struct mddev *mddev = container_of(ws, struct mddev, flush_work);
416 struct bio *bio = mddev->flush_bio;
418 if (bio->bi_iter.bi_size == 0)
419 /* an empty barrier - all done */
422 bio->bi_rw &= ~REQ_FLUSH;
423 mddev->pers->make_request(mddev, bio);
426 mddev->flush_bio = NULL;
427 wake_up(&mddev->sb_wait);
430 void md_flush_request(struct mddev *mddev, struct bio *bio)
432 spin_lock_irq(&mddev->lock);
433 wait_event_lock_irq(mddev->sb_wait,
436 mddev->flush_bio = bio;
437 spin_unlock_irq(&mddev->lock);
439 INIT_WORK(&mddev->flush_work, submit_flushes);
440 queue_work(md_wq, &mddev->flush_work);
442 EXPORT_SYMBOL(md_flush_request);
444 void md_unplug(struct blk_plug_cb *cb, bool from_schedule)
446 struct mddev *mddev = cb->data;
447 md_wakeup_thread(mddev->thread);
450 EXPORT_SYMBOL(md_unplug);
452 static inline struct mddev *mddev_get(struct mddev *mddev)
454 atomic_inc(&mddev->active);
458 static void mddev_delayed_delete(struct work_struct *ws);
460 static void mddev_put(struct mddev *mddev)
462 struct bio_set *bs = NULL;
464 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
466 if (!mddev->raid_disks && list_empty(&mddev->disks) &&
467 mddev->ctime == 0 && !mddev->hold_active) {
468 /* Array is not configured at all, and not held active,
470 list_del_init(&mddev->all_mddevs);
472 mddev->bio_set = NULL;
473 if (mddev->gendisk) {
474 /* We did a probe so need to clean up. Call
475 * queue_work inside the spinlock so that
476 * flush_workqueue() after mddev_find will
477 * succeed in waiting for the work to be done.
479 INIT_WORK(&mddev->del_work, mddev_delayed_delete);
480 queue_work(md_misc_wq, &mddev->del_work);
484 spin_unlock(&all_mddevs_lock);
489 static void md_safemode_timeout(unsigned long data);
491 void mddev_init(struct mddev *mddev)
493 mutex_init(&mddev->open_mutex);
494 mutex_init(&mddev->reconfig_mutex);
495 mutex_init(&mddev->bitmap_info.mutex);
496 INIT_LIST_HEAD(&mddev->disks);
497 INIT_LIST_HEAD(&mddev->all_mddevs);
498 setup_timer(&mddev->safemode_timer, md_safemode_timeout,
499 (unsigned long) mddev);
500 atomic_set(&mddev->active, 1);
501 atomic_set(&mddev->openers, 0);
502 atomic_set(&mddev->active_io, 0);
503 spin_lock_init(&mddev->lock);
504 atomic_set(&mddev->flush_pending, 0);
505 init_waitqueue_head(&mddev->sb_wait);
506 init_waitqueue_head(&mddev->recovery_wait);
507 mddev->reshape_position = MaxSector;
508 mddev->reshape_backwards = 0;
509 mddev->last_sync_action = "none";
510 mddev->resync_min = 0;
511 mddev->resync_max = MaxSector;
512 mddev->level = LEVEL_NONE;
514 EXPORT_SYMBOL_GPL(mddev_init);
516 static struct mddev *mddev_find(dev_t unit)
518 struct mddev *mddev, *new = NULL;
520 if (unit && MAJOR(unit) != MD_MAJOR)
521 unit &= ~((1<<MdpMinorShift)-1);
524 spin_lock(&all_mddevs_lock);
527 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
528 if (mddev->unit == unit) {
530 spin_unlock(&all_mddevs_lock);
536 list_add(&new->all_mddevs, &all_mddevs);
537 spin_unlock(&all_mddevs_lock);
538 new->hold_active = UNTIL_IOCTL;
542 /* find an unused unit number */
543 static int next_minor = 512;
544 int start = next_minor;
548 dev = MKDEV(MD_MAJOR, next_minor);
550 if (next_minor > MINORMASK)
552 if (next_minor == start) {
553 /* Oh dear, all in use. */
554 spin_unlock(&all_mddevs_lock);
560 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
561 if (mddev->unit == dev) {
567 new->md_minor = MINOR(dev);
568 new->hold_active = UNTIL_STOP;
569 list_add(&new->all_mddevs, &all_mddevs);
570 spin_unlock(&all_mddevs_lock);
573 spin_unlock(&all_mddevs_lock);
575 new = kzalloc(sizeof(*new), GFP_KERNEL);
580 if (MAJOR(unit) == MD_MAJOR)
581 new->md_minor = MINOR(unit);
583 new->md_minor = MINOR(unit) >> MdpMinorShift;
590 static struct attribute_group md_redundancy_group;
592 void mddev_unlock(struct mddev *mddev)
594 if (mddev->to_remove) {
595 /* These cannot be removed under reconfig_mutex as
596 * an access to the files will try to take reconfig_mutex
597 * while holding the file unremovable, which leads to
599 * So hold set sysfs_active while the remove in happeing,
600 * and anything else which might set ->to_remove or my
601 * otherwise change the sysfs namespace will fail with
602 * -EBUSY if sysfs_active is still set.
603 * We set sysfs_active under reconfig_mutex and elsewhere
604 * test it under the same mutex to ensure its correct value
607 struct attribute_group *to_remove = mddev->to_remove;
608 mddev->to_remove = NULL;
609 mddev->sysfs_active = 1;
610 mutex_unlock(&mddev->reconfig_mutex);
612 if (mddev->kobj.sd) {
613 if (to_remove != &md_redundancy_group)
614 sysfs_remove_group(&mddev->kobj, to_remove);
615 if (mddev->pers == NULL ||
616 mddev->pers->sync_request == NULL) {
617 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
618 if (mddev->sysfs_action)
619 sysfs_put(mddev->sysfs_action);
620 mddev->sysfs_action = NULL;
623 mddev->sysfs_active = 0;
625 mutex_unlock(&mddev->reconfig_mutex);
627 /* As we've dropped the mutex we need a spinlock to
628 * make sure the thread doesn't disappear
630 spin_lock(&pers_lock);
631 md_wakeup_thread(mddev->thread);
632 spin_unlock(&pers_lock);
634 EXPORT_SYMBOL_GPL(mddev_unlock);
636 struct md_rdev *md_find_rdev_nr_rcu(struct mddev *mddev, int nr)
638 struct md_rdev *rdev;
640 rdev_for_each_rcu(rdev, mddev)
641 if (rdev->desc_nr == nr)
646 EXPORT_SYMBOL_GPL(md_find_rdev_nr_rcu);
648 static struct md_rdev *find_rdev(struct mddev *mddev, dev_t dev)
650 struct md_rdev *rdev;
652 rdev_for_each(rdev, mddev)
653 if (rdev->bdev->bd_dev == dev)
659 static struct md_rdev *find_rdev_rcu(struct mddev *mddev, dev_t dev)
661 struct md_rdev *rdev;
663 rdev_for_each_rcu(rdev, mddev)
664 if (rdev->bdev->bd_dev == dev)
670 static struct md_personality *find_pers(int level, char *clevel)
672 struct md_personality *pers;
673 list_for_each_entry(pers, &pers_list, list) {
674 if (level != LEVEL_NONE && pers->level == level)
676 if (strcmp(pers->name, clevel)==0)
682 /* return the offset of the super block in 512byte sectors */
683 static inline sector_t calc_dev_sboffset(struct md_rdev *rdev)
685 sector_t num_sectors = i_size_read(rdev->bdev->bd_inode) / 512;
686 return MD_NEW_SIZE_SECTORS(num_sectors);
689 static int alloc_disk_sb(struct md_rdev *rdev)
691 rdev->sb_page = alloc_page(GFP_KERNEL);
692 if (!rdev->sb_page) {
693 printk(KERN_ALERT "md: out of memory.\n");
700 void md_rdev_clear(struct md_rdev *rdev)
703 put_page(rdev->sb_page);
705 rdev->sb_page = NULL;
710 put_page(rdev->bb_page);
711 rdev->bb_page = NULL;
713 badblocks_free(&rdev->badblocks);
715 EXPORT_SYMBOL_GPL(md_rdev_clear);
717 static void super_written(struct bio *bio)
719 struct md_rdev *rdev = bio->bi_private;
720 struct mddev *mddev = rdev->mddev;
723 printk("md: super_written gets error=%d\n", bio->bi_error);
724 md_error(mddev, rdev);
727 if (atomic_dec_and_test(&mddev->pending_writes))
728 wake_up(&mddev->sb_wait);
732 void md_super_write(struct mddev *mddev, struct md_rdev *rdev,
733 sector_t sector, int size, struct page *page)
735 /* write first size bytes of page to sector of rdev
736 * Increment mddev->pending_writes before returning
737 * and decrement it on completion, waking up sb_wait
738 * if zero is reached.
739 * If an error occurred, call md_error
741 struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, mddev);
743 bio->bi_bdev = rdev->meta_bdev ? rdev->meta_bdev : rdev->bdev;
744 bio->bi_iter.bi_sector = sector;
745 bio_add_page(bio, page, size, 0);
746 bio->bi_private = rdev;
747 bio->bi_end_io = super_written;
749 atomic_inc(&mddev->pending_writes);
750 submit_bio(WRITE_FLUSH_FUA, bio);
753 void md_super_wait(struct mddev *mddev)
755 /* wait for all superblock writes that were scheduled to complete */
756 wait_event(mddev->sb_wait, atomic_read(&mddev->pending_writes)==0);
759 int sync_page_io(struct md_rdev *rdev, sector_t sector, int size,
760 struct page *page, int rw, bool metadata_op)
762 struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, rdev->mddev);
765 bio->bi_bdev = (metadata_op && rdev->meta_bdev) ?
766 rdev->meta_bdev : rdev->bdev;
768 bio->bi_iter.bi_sector = sector + rdev->sb_start;
769 else if (rdev->mddev->reshape_position != MaxSector &&
770 (rdev->mddev->reshape_backwards ==
771 (sector >= rdev->mddev->reshape_position)))
772 bio->bi_iter.bi_sector = sector + rdev->new_data_offset;
774 bio->bi_iter.bi_sector = sector + rdev->data_offset;
775 bio_add_page(bio, page, size, 0);
776 submit_bio_wait(rw, bio);
778 ret = !bio->bi_error;
782 EXPORT_SYMBOL_GPL(sync_page_io);
784 static int read_disk_sb(struct md_rdev *rdev, int size)
786 char b[BDEVNAME_SIZE];
791 if (!sync_page_io(rdev, 0, size, rdev->sb_page, READ, true))
797 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
798 bdevname(rdev->bdev,b));
802 static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
804 return sb1->set_uuid0 == sb2->set_uuid0 &&
805 sb1->set_uuid1 == sb2->set_uuid1 &&
806 sb1->set_uuid2 == sb2->set_uuid2 &&
807 sb1->set_uuid3 == sb2->set_uuid3;
810 static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
813 mdp_super_t *tmp1, *tmp2;
815 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
816 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
818 if (!tmp1 || !tmp2) {
820 printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n");
828 * nr_disks is not constant
833 ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0);
840 static u32 md_csum_fold(u32 csum)
842 csum = (csum & 0xffff) + (csum >> 16);
843 return (csum & 0xffff) + (csum >> 16);
846 static unsigned int calc_sb_csum(mdp_super_t *sb)
849 u32 *sb32 = (u32*)sb;
851 unsigned int disk_csum, csum;
853 disk_csum = sb->sb_csum;
856 for (i = 0; i < MD_SB_BYTES/4 ; i++)
858 csum = (newcsum & 0xffffffff) + (newcsum>>32);
861 /* This used to use csum_partial, which was wrong for several
862 * reasons including that different results are returned on
863 * different architectures. It isn't critical that we get exactly
864 * the same return value as before (we always csum_fold before
865 * testing, and that removes any differences). However as we
866 * know that csum_partial always returned a 16bit value on
867 * alphas, do a fold to maximise conformity to previous behaviour.
869 sb->sb_csum = md_csum_fold(disk_csum);
871 sb->sb_csum = disk_csum;
877 * Handle superblock details.
878 * We want to be able to handle multiple superblock formats
879 * so we have a common interface to them all, and an array of
880 * different handlers.
881 * We rely on user-space to write the initial superblock, and support
882 * reading and updating of superblocks.
883 * Interface methods are:
884 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version)
885 * loads and validates a superblock on dev.
886 * if refdev != NULL, compare superblocks on both devices
888 * 0 - dev has a superblock that is compatible with refdev
889 * 1 - dev has a superblock that is compatible and newer than refdev
890 * so dev should be used as the refdev in future
891 * -EINVAL superblock incompatible or invalid
892 * -othererror e.g. -EIO
894 * int validate_super(struct mddev *mddev, struct md_rdev *dev)
895 * Verify that dev is acceptable into mddev.
896 * The first time, mddev->raid_disks will be 0, and data from
897 * dev should be merged in. Subsequent calls check that dev
898 * is new enough. Return 0 or -EINVAL
900 * void sync_super(struct mddev *mddev, struct md_rdev *dev)
901 * Update the superblock for rdev with data in mddev
902 * This does not write to disc.
908 struct module *owner;
909 int (*load_super)(struct md_rdev *rdev,
910 struct md_rdev *refdev,
912 int (*validate_super)(struct mddev *mddev,
913 struct md_rdev *rdev);
914 void (*sync_super)(struct mddev *mddev,
915 struct md_rdev *rdev);
916 unsigned long long (*rdev_size_change)(struct md_rdev *rdev,
917 sector_t num_sectors);
918 int (*allow_new_offset)(struct md_rdev *rdev,
919 unsigned long long new_offset);
923 * Check that the given mddev has no bitmap.
925 * This function is called from the run method of all personalities that do not
926 * support bitmaps. It prints an error message and returns non-zero if mddev
927 * has a bitmap. Otherwise, it returns 0.
930 int md_check_no_bitmap(struct mddev *mddev)
932 if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset)
934 printk(KERN_ERR "%s: bitmaps are not supported for %s\n",
935 mdname(mddev), mddev->pers->name);
938 EXPORT_SYMBOL(md_check_no_bitmap);
941 * load_super for 0.90.0
943 static int super_90_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
945 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
950 * Calculate the position of the superblock (512byte sectors),
951 * it's at the end of the disk.
953 * It also happens to be a multiple of 4Kb.
955 rdev->sb_start = calc_dev_sboffset(rdev);
957 ret = read_disk_sb(rdev, MD_SB_BYTES);
962 bdevname(rdev->bdev, b);
963 sb = page_address(rdev->sb_page);
965 if (sb->md_magic != MD_SB_MAGIC) {
966 printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
971 if (sb->major_version != 0 ||
972 sb->minor_version < 90 ||
973 sb->minor_version > 91) {
974 printk(KERN_WARNING "Bad version number %d.%d on %s\n",
975 sb->major_version, sb->minor_version,
980 if (sb->raid_disks <= 0)
983 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
984 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
989 rdev->preferred_minor = sb->md_minor;
990 rdev->data_offset = 0;
991 rdev->new_data_offset = 0;
992 rdev->sb_size = MD_SB_BYTES;
993 rdev->badblocks.shift = -1;
995 if (sb->level == LEVEL_MULTIPATH)
998 rdev->desc_nr = sb->this_disk.number;
1004 mdp_super_t *refsb = page_address(refdev->sb_page);
1005 if (!uuid_equal(refsb, sb)) {
1006 printk(KERN_WARNING "md: %s has different UUID to %s\n",
1007 b, bdevname(refdev->bdev,b2));
1010 if (!sb_equal(refsb, sb)) {
1011 printk(KERN_WARNING "md: %s has same UUID"
1012 " but different superblock to %s\n",
1013 b, bdevname(refdev->bdev, b2));
1017 ev2 = md_event(refsb);
1023 rdev->sectors = rdev->sb_start;
1024 /* Limit to 4TB as metadata cannot record more than that.
1025 * (not needed for Linear and RAID0 as metadata doesn't
1028 if (rdev->sectors >= (2ULL << 32) && sb->level >= 1)
1029 rdev->sectors = (2ULL << 32) - 2;
1031 if (rdev->sectors < ((sector_t)sb->size) * 2 && sb->level >= 1)
1032 /* "this cannot possibly happen" ... */
1040 * validate_super for 0.90.0
1042 static int super_90_validate(struct mddev *mddev, struct md_rdev *rdev)
1045 mdp_super_t *sb = page_address(rdev->sb_page);
1046 __u64 ev1 = md_event(sb);
1048 rdev->raid_disk = -1;
1049 clear_bit(Faulty, &rdev->flags);
1050 clear_bit(In_sync, &rdev->flags);
1051 clear_bit(Bitmap_sync, &rdev->flags);
1052 clear_bit(WriteMostly, &rdev->flags);
1054 if (mddev->raid_disks == 0) {
1055 mddev->major_version = 0;
1056 mddev->minor_version = sb->minor_version;
1057 mddev->patch_version = sb->patch_version;
1058 mddev->external = 0;
1059 mddev->chunk_sectors = sb->chunk_size >> 9;
1060 mddev->ctime = sb->ctime;
1061 mddev->utime = sb->utime;
1062 mddev->level = sb->level;
1063 mddev->clevel[0] = 0;
1064 mddev->layout = sb->layout;
1065 mddev->raid_disks = sb->raid_disks;
1066 mddev->dev_sectors = ((sector_t)sb->size) * 2;
1067 mddev->events = ev1;
1068 mddev->bitmap_info.offset = 0;
1069 mddev->bitmap_info.space = 0;
1070 /* bitmap can use 60 K after the 4K superblocks */
1071 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
1072 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
1073 mddev->reshape_backwards = 0;
1075 if (mddev->minor_version >= 91) {
1076 mddev->reshape_position = sb->reshape_position;
1077 mddev->delta_disks = sb->delta_disks;
1078 mddev->new_level = sb->new_level;
1079 mddev->new_layout = sb->new_layout;
1080 mddev->new_chunk_sectors = sb->new_chunk >> 9;
1081 if (mddev->delta_disks < 0)
1082 mddev->reshape_backwards = 1;
1084 mddev->reshape_position = MaxSector;
1085 mddev->delta_disks = 0;
1086 mddev->new_level = mddev->level;
1087 mddev->new_layout = mddev->layout;
1088 mddev->new_chunk_sectors = mddev->chunk_sectors;
1091 if (sb->state & (1<<MD_SB_CLEAN))
1092 mddev->recovery_cp = MaxSector;
1094 if (sb->events_hi == sb->cp_events_hi &&
1095 sb->events_lo == sb->cp_events_lo) {
1096 mddev->recovery_cp = sb->recovery_cp;
1098 mddev->recovery_cp = 0;
1101 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
1102 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
1103 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
1104 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
1106 mddev->max_disks = MD_SB_DISKS;
1108 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
1109 mddev->bitmap_info.file == NULL) {
1110 mddev->bitmap_info.offset =
1111 mddev->bitmap_info.default_offset;
1112 mddev->bitmap_info.space =
1113 mddev->bitmap_info.default_space;
1116 } else if (mddev->pers == NULL) {
1117 /* Insist on good event counter while assembling, except
1118 * for spares (which don't need an event count) */
1120 if (sb->disks[rdev->desc_nr].state & (
1121 (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE)))
1122 if (ev1 < mddev->events)
1124 } else if (mddev->bitmap) {
1125 /* if adding to array with a bitmap, then we can accept an
1126 * older device ... but not too old.
1128 if (ev1 < mddev->bitmap->events_cleared)
1130 if (ev1 < mddev->events)
1131 set_bit(Bitmap_sync, &rdev->flags);
1133 if (ev1 < mddev->events)
1134 /* just a hot-add of a new device, leave raid_disk at -1 */
1138 if (mddev->level != LEVEL_MULTIPATH) {
1139 desc = sb->disks + rdev->desc_nr;
1141 if (desc->state & (1<<MD_DISK_FAULTY))
1142 set_bit(Faulty, &rdev->flags);
1143 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
1144 desc->raid_disk < mddev->raid_disks */) {
1145 set_bit(In_sync, &rdev->flags);
1146 rdev->raid_disk = desc->raid_disk;
1147 rdev->saved_raid_disk = desc->raid_disk;
1148 } else if (desc->state & (1<<MD_DISK_ACTIVE)) {
1149 /* active but not in sync implies recovery up to
1150 * reshape position. We don't know exactly where
1151 * that is, so set to zero for now */
1152 if (mddev->minor_version >= 91) {
1153 rdev->recovery_offset = 0;
1154 rdev->raid_disk = desc->raid_disk;
1157 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
1158 set_bit(WriteMostly, &rdev->flags);
1159 } else /* MULTIPATH are always insync */
1160 set_bit(In_sync, &rdev->flags);
1165 * sync_super for 0.90.0
1167 static void super_90_sync(struct mddev *mddev, struct md_rdev *rdev)
1170 struct md_rdev *rdev2;
1171 int next_spare = mddev->raid_disks;
1173 /* make rdev->sb match mddev data..
1176 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1177 * 3/ any empty disks < next_spare become removed
1179 * disks[0] gets initialised to REMOVED because
1180 * we cannot be sure from other fields if it has
1181 * been initialised or not.
1184 int active=0, working=0,failed=0,spare=0,nr_disks=0;
1186 rdev->sb_size = MD_SB_BYTES;
1188 sb = page_address(rdev->sb_page);
1190 memset(sb, 0, sizeof(*sb));
1192 sb->md_magic = MD_SB_MAGIC;
1193 sb->major_version = mddev->major_version;
1194 sb->patch_version = mddev->patch_version;
1195 sb->gvalid_words = 0; /* ignored */
1196 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
1197 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
1198 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
1199 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
1201 sb->ctime = mddev->ctime;
1202 sb->level = mddev->level;
1203 sb->size = mddev->dev_sectors / 2;
1204 sb->raid_disks = mddev->raid_disks;
1205 sb->md_minor = mddev->md_minor;
1206 sb->not_persistent = 0;
1207 sb->utime = mddev->utime;
1209 sb->events_hi = (mddev->events>>32);
1210 sb->events_lo = (u32)mddev->events;
1212 if (mddev->reshape_position == MaxSector)
1213 sb->minor_version = 90;
1215 sb->minor_version = 91;
1216 sb->reshape_position = mddev->reshape_position;
1217 sb->new_level = mddev->new_level;
1218 sb->delta_disks = mddev->delta_disks;
1219 sb->new_layout = mddev->new_layout;
1220 sb->new_chunk = mddev->new_chunk_sectors << 9;
1222 mddev->minor_version = sb->minor_version;
1225 sb->recovery_cp = mddev->recovery_cp;
1226 sb->cp_events_hi = (mddev->events>>32);
1227 sb->cp_events_lo = (u32)mddev->events;
1228 if (mddev->recovery_cp == MaxSector)
1229 sb->state = (1<< MD_SB_CLEAN);
1231 sb->recovery_cp = 0;
1233 sb->layout = mddev->layout;
1234 sb->chunk_size = mddev->chunk_sectors << 9;
1236 if (mddev->bitmap && mddev->bitmap_info.file == NULL)
1237 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
1239 sb->disks[0].state = (1<<MD_DISK_REMOVED);
1240 rdev_for_each(rdev2, mddev) {
1243 int is_active = test_bit(In_sync, &rdev2->flags);
1245 if (rdev2->raid_disk >= 0 &&
1246 sb->minor_version >= 91)
1247 /* we have nowhere to store the recovery_offset,
1248 * but if it is not below the reshape_position,
1249 * we can piggy-back on that.
1252 if (rdev2->raid_disk < 0 ||
1253 test_bit(Faulty, &rdev2->flags))
1256 desc_nr = rdev2->raid_disk;
1258 desc_nr = next_spare++;
1259 rdev2->desc_nr = desc_nr;
1260 d = &sb->disks[rdev2->desc_nr];
1262 d->number = rdev2->desc_nr;
1263 d->major = MAJOR(rdev2->bdev->bd_dev);
1264 d->minor = MINOR(rdev2->bdev->bd_dev);
1266 d->raid_disk = rdev2->raid_disk;
1268 d->raid_disk = rdev2->desc_nr; /* compatibility */
1269 if (test_bit(Faulty, &rdev2->flags))
1270 d->state = (1<<MD_DISK_FAULTY);
1271 else if (is_active) {
1272 d->state = (1<<MD_DISK_ACTIVE);
1273 if (test_bit(In_sync, &rdev2->flags))
1274 d->state |= (1<<MD_DISK_SYNC);
1282 if (test_bit(WriteMostly, &rdev2->flags))
1283 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1285 /* now set the "removed" and "faulty" bits on any missing devices */
1286 for (i=0 ; i < mddev->raid_disks ; i++) {
1287 mdp_disk_t *d = &sb->disks[i];
1288 if (d->state == 0 && d->number == 0) {
1291 d->state = (1<<MD_DISK_REMOVED);
1292 d->state |= (1<<MD_DISK_FAULTY);
1296 sb->nr_disks = nr_disks;
1297 sb->active_disks = active;
1298 sb->working_disks = working;
1299 sb->failed_disks = failed;
1300 sb->spare_disks = spare;
1302 sb->this_disk = sb->disks[rdev->desc_nr];
1303 sb->sb_csum = calc_sb_csum(sb);
1307 * rdev_size_change for 0.90.0
1309 static unsigned long long
1310 super_90_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
1312 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1313 return 0; /* component must fit device */
1314 if (rdev->mddev->bitmap_info.offset)
1315 return 0; /* can't move bitmap */
1316 rdev->sb_start = calc_dev_sboffset(rdev);
1317 if (!num_sectors || num_sectors > rdev->sb_start)
1318 num_sectors = rdev->sb_start;
1319 /* Limit to 4TB as metadata cannot record more than that.
1320 * 4TB == 2^32 KB, or 2*2^32 sectors.
1322 if (num_sectors >= (2ULL << 32) && rdev->mddev->level >= 1)
1323 num_sectors = (2ULL << 32) - 2;
1324 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1326 md_super_wait(rdev->mddev);
1331 super_90_allow_new_offset(struct md_rdev *rdev, unsigned long long new_offset)
1333 /* non-zero offset changes not possible with v0.90 */
1334 return new_offset == 0;
1338 * version 1 superblock
1341 static __le32 calc_sb_1_csum(struct mdp_superblock_1 *sb)
1345 unsigned long long newcsum;
1346 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1347 __le32 *isuper = (__le32*)sb;
1349 disk_csum = sb->sb_csum;
1352 for (; size >= 4; size -= 4)
1353 newcsum += le32_to_cpu(*isuper++);
1356 newcsum += le16_to_cpu(*(__le16*) isuper);
1358 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1359 sb->sb_csum = disk_csum;
1360 return cpu_to_le32(csum);
1363 static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
1365 struct mdp_superblock_1 *sb;
1369 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1373 * Calculate the position of the superblock in 512byte sectors.
1374 * It is always aligned to a 4K boundary and
1375 * depeding on minor_version, it can be:
1376 * 0: At least 8K, but less than 12K, from end of device
1377 * 1: At start of device
1378 * 2: 4K from start of device.
1380 switch(minor_version) {
1382 sb_start = i_size_read(rdev->bdev->bd_inode) >> 9;
1384 sb_start &= ~(sector_t)(4*2-1);
1395 rdev->sb_start = sb_start;
1397 /* superblock is rarely larger than 1K, but it can be larger,
1398 * and it is safe to read 4k, so we do that
1400 ret = read_disk_sb(rdev, 4096);
1401 if (ret) return ret;
1403 sb = page_address(rdev->sb_page);
1405 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1406 sb->major_version != cpu_to_le32(1) ||
1407 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1408 le64_to_cpu(sb->super_offset) != rdev->sb_start ||
1409 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1412 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1413 printk("md: invalid superblock checksum on %s\n",
1414 bdevname(rdev->bdev,b));
1417 if (le64_to_cpu(sb->data_size) < 10) {
1418 printk("md: data_size too small on %s\n",
1419 bdevname(rdev->bdev,b));
1424 memcmp(sb->pad3, sb->pad3+1, sizeof(sb->pad3) - sizeof(sb->pad3[1])))
1425 /* Some padding is non-zero, might be a new feature */
1428 rdev->preferred_minor = 0xffff;
1429 rdev->data_offset = le64_to_cpu(sb->data_offset);
1430 rdev->new_data_offset = rdev->data_offset;
1431 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE) &&
1432 (le32_to_cpu(sb->feature_map) & MD_FEATURE_NEW_OFFSET))
1433 rdev->new_data_offset += (s32)le32_to_cpu(sb->new_offset);
1434 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1436 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1437 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1438 if (rdev->sb_size & bmask)
1439 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1442 && rdev->data_offset < sb_start + (rdev->sb_size/512))
1445 && rdev->new_data_offset < sb_start + (rdev->sb_size/512))
1448 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1451 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1453 if (!rdev->bb_page) {
1454 rdev->bb_page = alloc_page(GFP_KERNEL);
1458 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BAD_BLOCKS) &&
1459 rdev->badblocks.count == 0) {
1460 /* need to load the bad block list.
1461 * Currently we limit it to one page.
1467 int sectors = le16_to_cpu(sb->bblog_size);
1468 if (sectors > (PAGE_SIZE / 512))
1470 offset = le32_to_cpu(sb->bblog_offset);
1473 bb_sector = (long long)offset;
1474 if (!sync_page_io(rdev, bb_sector, sectors << 9,
1475 rdev->bb_page, READ, true))
1477 bbp = (u64 *)page_address(rdev->bb_page);
1478 rdev->badblocks.shift = sb->bblog_shift;
1479 for (i = 0 ; i < (sectors << (9-3)) ; i++, bbp++) {
1480 u64 bb = le64_to_cpu(*bbp);
1481 int count = bb & (0x3ff);
1482 u64 sector = bb >> 10;
1483 sector <<= sb->bblog_shift;
1484 count <<= sb->bblog_shift;
1487 if (badblocks_set(&rdev->badblocks, sector, count, 1))
1490 } else if (sb->bblog_offset != 0)
1491 rdev->badblocks.shift = 0;
1497 struct mdp_superblock_1 *refsb = page_address(refdev->sb_page);
1499 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1500 sb->level != refsb->level ||
1501 sb->layout != refsb->layout ||
1502 sb->chunksize != refsb->chunksize) {
1503 printk(KERN_WARNING "md: %s has strangely different"
1504 " superblock to %s\n",
1505 bdevname(rdev->bdev,b),
1506 bdevname(refdev->bdev,b2));
1509 ev1 = le64_to_cpu(sb->events);
1510 ev2 = le64_to_cpu(refsb->events);
1517 if (minor_version) {
1518 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9);
1519 sectors -= rdev->data_offset;
1521 sectors = rdev->sb_start;
1522 if (sectors < le64_to_cpu(sb->data_size))
1524 rdev->sectors = le64_to_cpu(sb->data_size);
1528 static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev)
1530 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
1531 __u64 ev1 = le64_to_cpu(sb->events);
1533 rdev->raid_disk = -1;
1534 clear_bit(Faulty, &rdev->flags);
1535 clear_bit(In_sync, &rdev->flags);
1536 clear_bit(Bitmap_sync, &rdev->flags);
1537 clear_bit(WriteMostly, &rdev->flags);
1539 if (mddev->raid_disks == 0) {
1540 mddev->major_version = 1;
1541 mddev->patch_version = 0;
1542 mddev->external = 0;
1543 mddev->chunk_sectors = le32_to_cpu(sb->chunksize);
1544 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1545 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1546 mddev->level = le32_to_cpu(sb->level);
1547 mddev->clevel[0] = 0;
1548 mddev->layout = le32_to_cpu(sb->layout);
1549 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1550 mddev->dev_sectors = le64_to_cpu(sb->size);
1551 mddev->events = ev1;
1552 mddev->bitmap_info.offset = 0;
1553 mddev->bitmap_info.space = 0;
1554 /* Default location for bitmap is 1K after superblock
1555 * using 3K - total of 4K
1557 mddev->bitmap_info.default_offset = 1024 >> 9;
1558 mddev->bitmap_info.default_space = (4096-1024) >> 9;
1559 mddev->reshape_backwards = 0;
1561 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1562 memcpy(mddev->uuid, sb->set_uuid, 16);
1564 mddev->max_disks = (4096-256)/2;
1566 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1567 mddev->bitmap_info.file == NULL) {
1568 mddev->bitmap_info.offset =
1569 (__s32)le32_to_cpu(sb->bitmap_offset);
1570 /* Metadata doesn't record how much space is available.
1571 * For 1.0, we assume we can use up to the superblock
1572 * if before, else to 4K beyond superblock.
1573 * For others, assume no change is possible.
1575 if (mddev->minor_version > 0)
1576 mddev->bitmap_info.space = 0;
1577 else if (mddev->bitmap_info.offset > 0)
1578 mddev->bitmap_info.space =
1579 8 - mddev->bitmap_info.offset;
1581 mddev->bitmap_info.space =
1582 -mddev->bitmap_info.offset;
1585 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1586 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1587 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1588 mddev->new_level = le32_to_cpu(sb->new_level);
1589 mddev->new_layout = le32_to_cpu(sb->new_layout);
1590 mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk);
1591 if (mddev->delta_disks < 0 ||
1592 (mddev->delta_disks == 0 &&
1593 (le32_to_cpu(sb->feature_map)
1594 & MD_FEATURE_RESHAPE_BACKWARDS)))
1595 mddev->reshape_backwards = 1;
1597 mddev->reshape_position = MaxSector;
1598 mddev->delta_disks = 0;
1599 mddev->new_level = mddev->level;
1600 mddev->new_layout = mddev->layout;
1601 mddev->new_chunk_sectors = mddev->chunk_sectors;
1604 } else if (mddev->pers == NULL) {
1605 /* Insist of good event counter while assembling, except for
1606 * spares (which don't need an event count) */
1608 if (rdev->desc_nr >= 0 &&
1609 rdev->desc_nr < le32_to_cpu(sb->max_dev) &&
1610 (le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < MD_DISK_ROLE_MAX ||
1611 le16_to_cpu(sb->dev_roles[rdev->desc_nr]) == MD_DISK_ROLE_JOURNAL))
1612 if (ev1 < mddev->events)
1614 } else if (mddev->bitmap) {
1615 /* If adding to array with a bitmap, then we can accept an
1616 * older device, but not too old.
1618 if (ev1 < mddev->bitmap->events_cleared)
1620 if (ev1 < mddev->events)
1621 set_bit(Bitmap_sync, &rdev->flags);
1623 if (ev1 < mddev->events)
1624 /* just a hot-add of a new device, leave raid_disk at -1 */
1627 if (mddev->level != LEVEL_MULTIPATH) {
1629 if (rdev->desc_nr < 0 ||
1630 rdev->desc_nr >= le32_to_cpu(sb->max_dev)) {
1631 role = MD_DISK_ROLE_SPARE;
1634 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1636 case MD_DISK_ROLE_SPARE: /* spare */
1638 case MD_DISK_ROLE_FAULTY: /* faulty */
1639 set_bit(Faulty, &rdev->flags);
1641 case MD_DISK_ROLE_JOURNAL: /* journal device */
1642 if (!(le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL)) {
1643 /* journal device without journal feature */
1645 "md: journal device provided without journal feature, ignoring the device\n");
1648 set_bit(Journal, &rdev->flags);
1649 rdev->journal_tail = le64_to_cpu(sb->journal_tail);
1650 if (mddev->recovery_cp == MaxSector)
1651 set_bit(MD_JOURNAL_CLEAN, &mddev->flags);
1652 rdev->raid_disk = mddev->raid_disks;
1655 rdev->saved_raid_disk = role;
1656 if ((le32_to_cpu(sb->feature_map) &
1657 MD_FEATURE_RECOVERY_OFFSET)) {
1658 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1659 if (!(le32_to_cpu(sb->feature_map) &
1660 MD_FEATURE_RECOVERY_BITMAP))
1661 rdev->saved_raid_disk = -1;
1663 set_bit(In_sync, &rdev->flags);
1664 rdev->raid_disk = role;
1667 if (sb->devflags & WriteMostly1)
1668 set_bit(WriteMostly, &rdev->flags);
1669 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_REPLACEMENT)
1670 set_bit(Replacement, &rdev->flags);
1671 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL)
1672 set_bit(MD_HAS_JOURNAL, &mddev->flags);
1673 } else /* MULTIPATH are always insync */
1674 set_bit(In_sync, &rdev->flags);
1679 static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev)
1681 struct mdp_superblock_1 *sb;
1682 struct md_rdev *rdev2;
1684 /* make rdev->sb match mddev and rdev data. */
1686 sb = page_address(rdev->sb_page);
1688 sb->feature_map = 0;
1690 sb->recovery_offset = cpu_to_le64(0);
1691 memset(sb->pad3, 0, sizeof(sb->pad3));
1693 sb->utime = cpu_to_le64((__u64)mddev->utime);
1694 sb->events = cpu_to_le64(mddev->events);
1696 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1697 else if (test_bit(MD_JOURNAL_CLEAN, &mddev->flags))
1698 sb->resync_offset = cpu_to_le64(MaxSector);
1700 sb->resync_offset = cpu_to_le64(0);
1702 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
1704 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
1705 sb->size = cpu_to_le64(mddev->dev_sectors);
1706 sb->chunksize = cpu_to_le32(mddev->chunk_sectors);
1707 sb->level = cpu_to_le32(mddev->level);
1708 sb->layout = cpu_to_le32(mddev->layout);
1710 if (test_bit(WriteMostly, &rdev->flags))
1711 sb->devflags |= WriteMostly1;
1713 sb->devflags &= ~WriteMostly1;
1714 sb->data_offset = cpu_to_le64(rdev->data_offset);
1715 sb->data_size = cpu_to_le64(rdev->sectors);
1717 if (mddev->bitmap && mddev->bitmap_info.file == NULL) {
1718 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset);
1719 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
1722 if (rdev->raid_disk >= 0 && !test_bit(Journal, &rdev->flags) &&
1723 !test_bit(In_sync, &rdev->flags)) {
1725 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1726 sb->recovery_offset =
1727 cpu_to_le64(rdev->recovery_offset);
1728 if (rdev->saved_raid_disk >= 0 && mddev->bitmap)
1730 cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP);
1732 /* Note: recovery_offset and journal_tail share space */
1733 if (test_bit(Journal, &rdev->flags))
1734 sb->journal_tail = cpu_to_le64(rdev->journal_tail);
1735 if (test_bit(Replacement, &rdev->flags))
1737 cpu_to_le32(MD_FEATURE_REPLACEMENT);
1739 if (mddev->reshape_position != MaxSector) {
1740 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1741 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1742 sb->new_layout = cpu_to_le32(mddev->new_layout);
1743 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1744 sb->new_level = cpu_to_le32(mddev->new_level);
1745 sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors);
1746 if (mddev->delta_disks == 0 &&
1747 mddev->reshape_backwards)
1749 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS);
1750 if (rdev->new_data_offset != rdev->data_offset) {
1752 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET);
1753 sb->new_offset = cpu_to_le32((__u32)(rdev->new_data_offset
1754 - rdev->data_offset));
1758 if (mddev_is_clustered(mddev))
1759 sb->feature_map |= cpu_to_le32(MD_FEATURE_CLUSTERED);
1761 if (rdev->badblocks.count == 0)
1762 /* Nothing to do for bad blocks*/ ;
1763 else if (sb->bblog_offset == 0)
1764 /* Cannot record bad blocks on this device */
1765 md_error(mddev, rdev);
1767 struct badblocks *bb = &rdev->badblocks;
1768 u64 *bbp = (u64 *)page_address(rdev->bb_page);
1770 sb->feature_map |= cpu_to_le32(MD_FEATURE_BAD_BLOCKS);
1775 seq = read_seqbegin(&bb->lock);
1777 memset(bbp, 0xff, PAGE_SIZE);
1779 for (i = 0 ; i < bb->count ; i++) {
1780 u64 internal_bb = p[i];
1781 u64 store_bb = ((BB_OFFSET(internal_bb) << 10)
1782 | BB_LEN(internal_bb));
1783 bbp[i] = cpu_to_le64(store_bb);
1786 if (read_seqretry(&bb->lock, seq))
1789 bb->sector = (rdev->sb_start +
1790 (int)le32_to_cpu(sb->bblog_offset));
1791 bb->size = le16_to_cpu(sb->bblog_size);
1796 rdev_for_each(rdev2, mddev)
1797 if (rdev2->desc_nr+1 > max_dev)
1798 max_dev = rdev2->desc_nr+1;
1800 if (max_dev > le32_to_cpu(sb->max_dev)) {
1802 sb->max_dev = cpu_to_le32(max_dev);
1803 rdev->sb_size = max_dev * 2 + 256;
1804 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1805 if (rdev->sb_size & bmask)
1806 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1808 max_dev = le32_to_cpu(sb->max_dev);
1810 for (i=0; i<max_dev;i++)
1811 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_FAULTY);
1813 if (test_bit(MD_HAS_JOURNAL, &mddev->flags))
1814 sb->feature_map |= cpu_to_le32(MD_FEATURE_JOURNAL);
1816 rdev_for_each(rdev2, mddev) {
1818 if (test_bit(Faulty, &rdev2->flags))
1819 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_FAULTY);
1820 else if (test_bit(In_sync, &rdev2->flags))
1821 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1822 else if (test_bit(Journal, &rdev2->flags))
1823 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_JOURNAL);
1824 else if (rdev2->raid_disk >= 0)
1825 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1827 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_SPARE);
1830 sb->sb_csum = calc_sb_1_csum(sb);
1833 static unsigned long long
1834 super_1_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
1836 struct mdp_superblock_1 *sb;
1837 sector_t max_sectors;
1838 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1839 return 0; /* component must fit device */
1840 if (rdev->data_offset != rdev->new_data_offset)
1841 return 0; /* too confusing */
1842 if (rdev->sb_start < rdev->data_offset) {
1843 /* minor versions 1 and 2; superblock before data */
1844 max_sectors = i_size_read(rdev->bdev->bd_inode) >> 9;
1845 max_sectors -= rdev->data_offset;
1846 if (!num_sectors || num_sectors > max_sectors)
1847 num_sectors = max_sectors;
1848 } else if (rdev->mddev->bitmap_info.offset) {
1849 /* minor version 0 with bitmap we can't move */
1852 /* minor version 0; superblock after data */
1854 sb_start = (i_size_read(rdev->bdev->bd_inode) >> 9) - 8*2;
1855 sb_start &= ~(sector_t)(4*2 - 1);
1856 max_sectors = rdev->sectors + sb_start - rdev->sb_start;
1857 if (!num_sectors || num_sectors > max_sectors)
1858 num_sectors = max_sectors;
1859 rdev->sb_start = sb_start;
1861 sb = page_address(rdev->sb_page);
1862 sb->data_size = cpu_to_le64(num_sectors);
1863 sb->super_offset = rdev->sb_start;
1864 sb->sb_csum = calc_sb_1_csum(sb);
1865 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1867 md_super_wait(rdev->mddev);
1873 super_1_allow_new_offset(struct md_rdev *rdev,
1874 unsigned long long new_offset)
1876 /* All necessary checks on new >= old have been done */
1877 struct bitmap *bitmap;
1878 if (new_offset >= rdev->data_offset)
1881 /* with 1.0 metadata, there is no metadata to tread on
1882 * so we can always move back */
1883 if (rdev->mddev->minor_version == 0)
1886 /* otherwise we must be sure not to step on
1887 * any metadata, so stay:
1888 * 36K beyond start of superblock
1889 * beyond end of badblocks
1890 * beyond write-intent bitmap
1892 if (rdev->sb_start + (32+4)*2 > new_offset)
1894 bitmap = rdev->mddev->bitmap;
1895 if (bitmap && !rdev->mddev->bitmap_info.file &&
1896 rdev->sb_start + rdev->mddev->bitmap_info.offset +
1897 bitmap->storage.file_pages * (PAGE_SIZE>>9) > new_offset)
1899 if (rdev->badblocks.sector + rdev->badblocks.size > new_offset)
1905 static struct super_type super_types[] = {
1908 .owner = THIS_MODULE,
1909 .load_super = super_90_load,
1910 .validate_super = super_90_validate,
1911 .sync_super = super_90_sync,
1912 .rdev_size_change = super_90_rdev_size_change,
1913 .allow_new_offset = super_90_allow_new_offset,
1917 .owner = THIS_MODULE,
1918 .load_super = super_1_load,
1919 .validate_super = super_1_validate,
1920 .sync_super = super_1_sync,
1921 .rdev_size_change = super_1_rdev_size_change,
1922 .allow_new_offset = super_1_allow_new_offset,
1926 static void sync_super(struct mddev *mddev, struct md_rdev *rdev)
1928 if (mddev->sync_super) {
1929 mddev->sync_super(mddev, rdev);
1933 BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types));
1935 super_types[mddev->major_version].sync_super(mddev, rdev);
1938 static int match_mddev_units(struct mddev *mddev1, struct mddev *mddev2)
1940 struct md_rdev *rdev, *rdev2;
1943 rdev_for_each_rcu(rdev, mddev1) {
1944 if (test_bit(Faulty, &rdev->flags) ||
1945 test_bit(Journal, &rdev->flags) ||
1946 rdev->raid_disk == -1)
1948 rdev_for_each_rcu(rdev2, mddev2) {
1949 if (test_bit(Faulty, &rdev2->flags) ||
1950 test_bit(Journal, &rdev2->flags) ||
1951 rdev2->raid_disk == -1)
1953 if (rdev->bdev->bd_contains ==
1954 rdev2->bdev->bd_contains) {
1964 static LIST_HEAD(pending_raid_disks);
1967 * Try to register data integrity profile for an mddev
1969 * This is called when an array is started and after a disk has been kicked
1970 * from the array. It only succeeds if all working and active component devices
1971 * are integrity capable with matching profiles.
1973 int md_integrity_register(struct mddev *mddev)
1975 struct md_rdev *rdev, *reference = NULL;
1977 if (list_empty(&mddev->disks))
1978 return 0; /* nothing to do */
1979 if (!mddev->gendisk || blk_get_integrity(mddev->gendisk))
1980 return 0; /* shouldn't register, or already is */
1981 rdev_for_each(rdev, mddev) {
1982 /* skip spares and non-functional disks */
1983 if (test_bit(Faulty, &rdev->flags))
1985 if (rdev->raid_disk < 0)
1988 /* Use the first rdev as the reference */
1992 /* does this rdev's profile match the reference profile? */
1993 if (blk_integrity_compare(reference->bdev->bd_disk,
1994 rdev->bdev->bd_disk) < 0)
1997 if (!reference || !bdev_get_integrity(reference->bdev))
2000 * All component devices are integrity capable and have matching
2001 * profiles, register the common profile for the md device.
2003 blk_integrity_register(mddev->gendisk,
2004 bdev_get_integrity(reference->bdev));
2006 printk(KERN_NOTICE "md: data integrity enabled on %s\n", mdname(mddev));
2007 if (bioset_integrity_create(mddev->bio_set, BIO_POOL_SIZE)) {
2008 printk(KERN_ERR "md: failed to create integrity pool for %s\n",
2014 EXPORT_SYMBOL(md_integrity_register);
2016 /* Disable data integrity if non-capable/non-matching disk is being added */
2017 void md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev)
2019 struct blk_integrity *bi_rdev;
2020 struct blk_integrity *bi_mddev;
2022 if (!mddev->gendisk)
2025 bi_rdev = bdev_get_integrity(rdev->bdev);
2026 bi_mddev = blk_get_integrity(mddev->gendisk);
2028 if (!bi_mddev) /* nothing to do */
2030 if (rdev->raid_disk < 0) /* skip spares */
2032 if (bi_rdev && blk_integrity_compare(mddev->gendisk,
2033 rdev->bdev->bd_disk) >= 0)
2035 WARN_ON_ONCE(!mddev->suspended);
2036 printk(KERN_NOTICE "disabling data integrity on %s\n", mdname(mddev));
2037 blk_integrity_unregister(mddev->gendisk);
2039 EXPORT_SYMBOL(md_integrity_add_rdev);
2041 static int bind_rdev_to_array(struct md_rdev *rdev, struct mddev *mddev)
2043 char b[BDEVNAME_SIZE];
2047 /* prevent duplicates */
2048 if (find_rdev(mddev, rdev->bdev->bd_dev))
2051 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2052 if (rdev->sectors && (mddev->dev_sectors == 0 ||
2053 rdev->sectors < mddev->dev_sectors)) {
2055 /* Cannot change size, so fail
2056 * If mddev->level <= 0, then we don't care
2057 * about aligning sizes (e.g. linear)
2059 if (mddev->level > 0)
2062 mddev->dev_sectors = rdev->sectors;
2065 /* Verify rdev->desc_nr is unique.
2066 * If it is -1, assign a free number, else
2067 * check number is not in use
2070 if (rdev->desc_nr < 0) {
2073 choice = mddev->raid_disks;
2074 while (md_find_rdev_nr_rcu(mddev, choice))
2076 rdev->desc_nr = choice;
2078 if (md_find_rdev_nr_rcu(mddev, rdev->desc_nr)) {
2084 if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) {
2085 printk(KERN_WARNING "md: %s: array is limited to %d devices\n",
2086 mdname(mddev), mddev->max_disks);
2089 bdevname(rdev->bdev,b);
2090 strreplace(b, '/', '!');
2092 rdev->mddev = mddev;
2093 printk(KERN_INFO "md: bind<%s>\n", b);
2095 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
2098 ko = &part_to_dev(rdev->bdev->bd_part)->kobj;
2099 if (sysfs_create_link(&rdev->kobj, ko, "block"))
2100 /* failure here is OK */;
2101 rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state");
2103 list_add_rcu(&rdev->same_set, &mddev->disks);
2104 bd_link_disk_holder(rdev->bdev, mddev->gendisk);
2106 /* May as well allow recovery to be retried once */
2107 mddev->recovery_disabled++;
2112 printk(KERN_WARNING "md: failed to register dev-%s for %s\n",
2117 static void md_delayed_delete(struct work_struct *ws)
2119 struct md_rdev *rdev = container_of(ws, struct md_rdev, del_work);
2120 kobject_del(&rdev->kobj);
2121 kobject_put(&rdev->kobj);
2124 static void unbind_rdev_from_array(struct md_rdev *rdev)
2126 char b[BDEVNAME_SIZE];
2128 bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk);
2129 list_del_rcu(&rdev->same_set);
2130 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
2132 sysfs_remove_link(&rdev->kobj, "block");
2133 sysfs_put(rdev->sysfs_state);
2134 rdev->sysfs_state = NULL;
2135 rdev->badblocks.count = 0;
2136 /* We need to delay this, otherwise we can deadlock when
2137 * writing to 'remove' to "dev/state". We also need
2138 * to delay it due to rcu usage.
2141 INIT_WORK(&rdev->del_work, md_delayed_delete);
2142 kobject_get(&rdev->kobj);
2143 queue_work(md_misc_wq, &rdev->del_work);
2147 * prevent the device from being mounted, repartitioned or
2148 * otherwise reused by a RAID array (or any other kernel
2149 * subsystem), by bd_claiming the device.
2151 static int lock_rdev(struct md_rdev *rdev, dev_t dev, int shared)
2154 struct block_device *bdev;
2155 char b[BDEVNAME_SIZE];
2157 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
2158 shared ? (struct md_rdev *)lock_rdev : rdev);
2160 printk(KERN_ERR "md: could not open %s.\n",
2161 __bdevname(dev, b));
2162 return PTR_ERR(bdev);
2168 static void unlock_rdev(struct md_rdev *rdev)
2170 struct block_device *bdev = rdev->bdev;
2172 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
2175 void md_autodetect_dev(dev_t dev);
2177 static void export_rdev(struct md_rdev *rdev)
2179 char b[BDEVNAME_SIZE];
2181 printk(KERN_INFO "md: export_rdev(%s)\n",
2182 bdevname(rdev->bdev,b));
2183 md_rdev_clear(rdev);
2185 if (test_bit(AutoDetected, &rdev->flags))
2186 md_autodetect_dev(rdev->bdev->bd_dev);
2189 kobject_put(&rdev->kobj);
2192 void md_kick_rdev_from_array(struct md_rdev *rdev)
2194 unbind_rdev_from_array(rdev);
2197 EXPORT_SYMBOL_GPL(md_kick_rdev_from_array);
2199 static void export_array(struct mddev *mddev)
2201 struct md_rdev *rdev;
2203 while (!list_empty(&mddev->disks)) {
2204 rdev = list_first_entry(&mddev->disks, struct md_rdev,
2206 md_kick_rdev_from_array(rdev);
2208 mddev->raid_disks = 0;
2209 mddev->major_version = 0;
2212 static void sync_sbs(struct mddev *mddev, int nospares)
2214 /* Update each superblock (in-memory image), but
2215 * if we are allowed to, skip spares which already
2216 * have the right event counter, or have one earlier
2217 * (which would mean they aren't being marked as dirty
2218 * with the rest of the array)
2220 struct md_rdev *rdev;
2221 rdev_for_each(rdev, mddev) {
2222 if (rdev->sb_events == mddev->events ||
2224 rdev->raid_disk < 0 &&
2225 rdev->sb_events+1 == mddev->events)) {
2226 /* Don't update this superblock */
2227 rdev->sb_loaded = 2;
2229 sync_super(mddev, rdev);
2230 rdev->sb_loaded = 1;
2235 static bool does_sb_need_changing(struct mddev *mddev)
2237 struct md_rdev *rdev;
2238 struct mdp_superblock_1 *sb;
2241 /* Find a good rdev */
2242 rdev_for_each(rdev, mddev)
2243 if ((rdev->raid_disk >= 0) && !test_bit(Faulty, &rdev->flags))
2246 /* No good device found. */
2250 sb = page_address(rdev->sb_page);
2251 /* Check if a device has become faulty or a spare become active */
2252 rdev_for_each(rdev, mddev) {
2253 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
2254 /* Device activated? */
2255 if (role == 0xffff && rdev->raid_disk >=0 &&
2256 !test_bit(Faulty, &rdev->flags))
2258 /* Device turned faulty? */
2259 if (test_bit(Faulty, &rdev->flags) && (role < 0xfffd))
2263 /* Check if any mddev parameters have changed */
2264 if ((mddev->dev_sectors != le64_to_cpu(sb->size)) ||
2265 (mddev->reshape_position != le64_to_cpu(sb->reshape_position)) ||
2266 (mddev->layout != le64_to_cpu(sb->layout)) ||
2267 (mddev->raid_disks != le32_to_cpu(sb->raid_disks)) ||
2268 (mddev->chunk_sectors != le32_to_cpu(sb->chunksize)))
2274 void md_update_sb(struct mddev *mddev, int force_change)
2276 struct md_rdev *rdev;
2279 int any_badblocks_changed = 0;
2284 set_bit(MD_CHANGE_DEVS, &mddev->flags);
2288 if (mddev_is_clustered(mddev)) {
2289 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
2291 ret = md_cluster_ops->metadata_update_start(mddev);
2292 /* Has someone else has updated the sb */
2293 if (!does_sb_need_changing(mddev)) {
2295 md_cluster_ops->metadata_update_cancel(mddev);
2296 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2301 /* First make sure individual recovery_offsets are correct */
2302 rdev_for_each(rdev, mddev) {
2303 if (rdev->raid_disk >= 0 &&
2304 mddev->delta_disks >= 0 &&
2305 !test_bit(Journal, &rdev->flags) &&
2306 !test_bit(In_sync, &rdev->flags) &&
2307 mddev->curr_resync_completed > rdev->recovery_offset)
2308 rdev->recovery_offset = mddev->curr_resync_completed;
2311 if (!mddev->persistent) {
2312 clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
2313 clear_bit(MD_CHANGE_DEVS, &mddev->flags);
2314 if (!mddev->external) {
2315 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2316 rdev_for_each(rdev, mddev) {
2317 if (rdev->badblocks.changed) {
2318 rdev->badblocks.changed = 0;
2319 ack_all_badblocks(&rdev->badblocks);
2320 md_error(mddev, rdev);
2322 clear_bit(Blocked, &rdev->flags);
2323 clear_bit(BlockedBadBlocks, &rdev->flags);
2324 wake_up(&rdev->blocked_wait);
2327 wake_up(&mddev->sb_wait);
2331 spin_lock(&mddev->lock);
2333 mddev->utime = get_seconds();
2335 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
2337 if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags))
2338 /* just a clean<-> dirty transition, possibly leave spares alone,
2339 * though if events isn't the right even/odd, we will have to do
2345 if (mddev->degraded)
2346 /* If the array is degraded, then skipping spares is both
2347 * dangerous and fairly pointless.
2348 * Dangerous because a device that was removed from the array
2349 * might have a event_count that still looks up-to-date,
2350 * so it can be re-added without a resync.
2351 * Pointless because if there are any spares to skip,
2352 * then a recovery will happen and soon that array won't
2353 * be degraded any more and the spare can go back to sleep then.
2357 sync_req = mddev->in_sync;
2359 /* If this is just a dirty<->clean transition, and the array is clean
2360 * and 'events' is odd, we can roll back to the previous clean state */
2362 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
2363 && mddev->can_decrease_events
2364 && mddev->events != 1) {
2366 mddev->can_decrease_events = 0;
2368 /* otherwise we have to go forward and ... */
2370 mddev->can_decrease_events = nospares;
2374 * This 64-bit counter should never wrap.
2375 * Either we are in around ~1 trillion A.C., assuming
2376 * 1 reboot per second, or we have a bug...
2378 WARN_ON(mddev->events == 0);
2380 rdev_for_each(rdev, mddev) {
2381 if (rdev->badblocks.changed)
2382 any_badblocks_changed++;
2383 if (test_bit(Faulty, &rdev->flags))
2384 set_bit(FaultRecorded, &rdev->flags);
2387 sync_sbs(mddev, nospares);
2388 spin_unlock(&mddev->lock);
2390 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2391 mdname(mddev), mddev->in_sync);
2393 bitmap_update_sb(mddev->bitmap);
2394 rdev_for_each(rdev, mddev) {
2395 char b[BDEVNAME_SIZE];
2397 if (rdev->sb_loaded != 1)
2398 continue; /* no noise on spare devices */
2400 if (!test_bit(Faulty, &rdev->flags)) {
2401 md_super_write(mddev,rdev,
2402 rdev->sb_start, rdev->sb_size,
2404 pr_debug("md: (write) %s's sb offset: %llu\n",
2405 bdevname(rdev->bdev, b),
2406 (unsigned long long)rdev->sb_start);
2407 rdev->sb_events = mddev->events;
2408 if (rdev->badblocks.size) {
2409 md_super_write(mddev, rdev,
2410 rdev->badblocks.sector,
2411 rdev->badblocks.size << 9,
2413 rdev->badblocks.size = 0;
2417 pr_debug("md: %s (skipping faulty)\n",
2418 bdevname(rdev->bdev, b));
2420 if (mddev->level == LEVEL_MULTIPATH)
2421 /* only need to write one superblock... */
2424 md_super_wait(mddev);
2425 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2427 spin_lock(&mddev->lock);
2428 if (mddev->in_sync != sync_req ||
2429 test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
2430 /* have to write it out again */
2431 spin_unlock(&mddev->lock);
2434 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2435 spin_unlock(&mddev->lock);
2436 wake_up(&mddev->sb_wait);
2437 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
2438 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
2440 rdev_for_each(rdev, mddev) {
2441 if (test_and_clear_bit(FaultRecorded, &rdev->flags))
2442 clear_bit(Blocked, &rdev->flags);
2444 if (any_badblocks_changed)
2445 ack_all_badblocks(&rdev->badblocks);
2446 clear_bit(BlockedBadBlocks, &rdev->flags);
2447 wake_up(&rdev->blocked_wait);
2450 if (mddev_is_clustered(mddev) && ret == 0)
2451 md_cluster_ops->metadata_update_finish(mddev);
2453 EXPORT_SYMBOL(md_update_sb);
2455 static int add_bound_rdev(struct md_rdev *rdev)
2457 struct mddev *mddev = rdev->mddev;
2460 if (!mddev->pers->hot_remove_disk) {
2461 /* If there is hot_add_disk but no hot_remove_disk
2462 * then added disks for geometry changes,
2463 * and should be added immediately.
2465 super_types[mddev->major_version].
2466 validate_super(mddev, rdev);
2467 err = mddev->pers->hot_add_disk(mddev, rdev);
2469 unbind_rdev_from_array(rdev);
2474 sysfs_notify_dirent_safe(rdev->sysfs_state);
2476 set_bit(MD_CHANGE_DEVS, &mddev->flags);
2477 if (mddev->degraded)
2478 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
2479 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2480 md_new_event(mddev);
2481 md_wakeup_thread(mddev->thread);
2485 /* words written to sysfs files may, or may not, be \n terminated.
2486 * We want to accept with case. For this we use cmd_match.
2488 static int cmd_match(const char *cmd, const char *str)
2490 /* See if cmd, written into a sysfs file, matches
2491 * str. They must either be the same, or cmd can
2492 * have a trailing newline
2494 while (*cmd && *str && *cmd == *str) {
2505 struct rdev_sysfs_entry {
2506 struct attribute attr;
2507 ssize_t (*show)(struct md_rdev *, char *);
2508 ssize_t (*store)(struct md_rdev *, const char *, size_t);
2512 state_show(struct md_rdev *rdev, char *page)
2516 unsigned long flags = ACCESS_ONCE(rdev->flags);
2518 if (test_bit(Faulty, &flags) ||
2519 rdev->badblocks.unacked_exist) {
2520 len+= sprintf(page+len, "%sfaulty",sep);
2523 if (test_bit(In_sync, &flags)) {
2524 len += sprintf(page+len, "%sin_sync",sep);
2527 if (test_bit(Journal, &flags)) {
2528 len += sprintf(page+len, "%sjournal",sep);
2531 if (test_bit(WriteMostly, &flags)) {
2532 len += sprintf(page+len, "%swrite_mostly",sep);
2535 if (test_bit(Blocked, &flags) ||
2536 (rdev->badblocks.unacked_exist
2537 && !test_bit(Faulty, &flags))) {
2538 len += sprintf(page+len, "%sblocked", sep);
2541 if (!test_bit(Faulty, &flags) &&
2542 !test_bit(Journal, &flags) &&
2543 !test_bit(In_sync, &flags)) {
2544 len += sprintf(page+len, "%sspare", sep);
2547 if (test_bit(WriteErrorSeen, &flags)) {
2548 len += sprintf(page+len, "%swrite_error", sep);
2551 if (test_bit(WantReplacement, &flags)) {
2552 len += sprintf(page+len, "%swant_replacement", sep);
2555 if (test_bit(Replacement, &flags)) {
2556 len += sprintf(page+len, "%sreplacement", sep);
2560 return len+sprintf(page+len, "\n");
2564 state_store(struct md_rdev *rdev, const char *buf, size_t len)
2567 * faulty - simulates an error
2568 * remove - disconnects the device
2569 * writemostly - sets write_mostly
2570 * -writemostly - clears write_mostly
2571 * blocked - sets the Blocked flags
2572 * -blocked - clears the Blocked and possibly simulates an error
2573 * insync - sets Insync providing device isn't active
2574 * -insync - clear Insync for a device with a slot assigned,
2575 * so that it gets rebuilt based on bitmap
2576 * write_error - sets WriteErrorSeen
2577 * -write_error - clears WriteErrorSeen
2580 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
2581 md_error(rdev->mddev, rdev);
2582 if (test_bit(Faulty, &rdev->flags))
2586 } else if (cmd_match(buf, "remove")) {
2587 if (rdev->raid_disk >= 0)
2590 struct mddev *mddev = rdev->mddev;
2592 if (mddev_is_clustered(mddev))
2593 err = md_cluster_ops->remove_disk(mddev, rdev);
2596 md_kick_rdev_from_array(rdev);
2598 md_update_sb(mddev, 1);
2599 md_new_event(mddev);
2602 } else if (cmd_match(buf, "writemostly")) {
2603 set_bit(WriteMostly, &rdev->flags);
2605 } else if (cmd_match(buf, "-writemostly")) {
2606 clear_bit(WriteMostly, &rdev->flags);
2608 } else if (cmd_match(buf, "blocked")) {
2609 set_bit(Blocked, &rdev->flags);
2611 } else if (cmd_match(buf, "-blocked")) {
2612 if (!test_bit(Faulty, &rdev->flags) &&
2613 rdev->badblocks.unacked_exist) {
2614 /* metadata handler doesn't understand badblocks,
2615 * so we need to fail the device
2617 md_error(rdev->mddev, rdev);
2619 clear_bit(Blocked, &rdev->flags);
2620 clear_bit(BlockedBadBlocks, &rdev->flags);
2621 wake_up(&rdev->blocked_wait);
2622 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2623 md_wakeup_thread(rdev->mddev->thread);
2626 } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) {
2627 set_bit(In_sync, &rdev->flags);
2629 } else if (cmd_match(buf, "-insync") && rdev->raid_disk >= 0 &&
2630 !test_bit(Journal, &rdev->flags)) {
2631 if (rdev->mddev->pers == NULL) {
2632 clear_bit(In_sync, &rdev->flags);
2633 rdev->saved_raid_disk = rdev->raid_disk;
2634 rdev->raid_disk = -1;
2637 } else if (cmd_match(buf, "write_error")) {
2638 set_bit(WriteErrorSeen, &rdev->flags);
2640 } else if (cmd_match(buf, "-write_error")) {
2641 clear_bit(WriteErrorSeen, &rdev->flags);
2643 } else if (cmd_match(buf, "want_replacement")) {
2644 /* Any non-spare device that is not a replacement can
2645 * become want_replacement at any time, but we then need to
2646 * check if recovery is needed.
2648 if (rdev->raid_disk >= 0 &&
2649 !test_bit(Journal, &rdev->flags) &&
2650 !test_bit(Replacement, &rdev->flags))
2651 set_bit(WantReplacement, &rdev->flags);
2652 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2653 md_wakeup_thread(rdev->mddev->thread);
2655 } else if (cmd_match(buf, "-want_replacement")) {
2656 /* Clearing 'want_replacement' is always allowed.
2657 * Once replacements starts it is too late though.
2660 clear_bit(WantReplacement, &rdev->flags);
2661 } else if (cmd_match(buf, "replacement")) {
2662 /* Can only set a device as a replacement when array has not
2663 * yet been started. Once running, replacement is automatic
2664 * from spares, or by assigning 'slot'.
2666 if (rdev->mddev->pers)
2669 set_bit(Replacement, &rdev->flags);
2672 } else if (cmd_match(buf, "-replacement")) {
2673 /* Similarly, can only clear Replacement before start */
2674 if (rdev->mddev->pers)
2677 clear_bit(Replacement, &rdev->flags);
2680 } else if (cmd_match(buf, "re-add")) {
2681 if (test_bit(Faulty, &rdev->flags) && (rdev->raid_disk == -1)) {
2682 /* clear_bit is performed _after_ all the devices
2683 * have their local Faulty bit cleared. If any writes
2684 * happen in the meantime in the local node, they
2685 * will land in the local bitmap, which will be synced
2686 * by this node eventually
2688 if (!mddev_is_clustered(rdev->mddev) ||
2689 (err = md_cluster_ops->gather_bitmaps(rdev)) == 0) {
2690 clear_bit(Faulty, &rdev->flags);
2691 err = add_bound_rdev(rdev);
2697 sysfs_notify_dirent_safe(rdev->sysfs_state);
2698 return err ? err : len;
2700 static struct rdev_sysfs_entry rdev_state =
2701 __ATTR_PREALLOC(state, S_IRUGO|S_IWUSR, state_show, state_store);
2704 errors_show(struct md_rdev *rdev, char *page)
2706 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
2710 errors_store(struct md_rdev *rdev, const char *buf, size_t len)
2715 rv = kstrtouint(buf, 10, &n);
2718 atomic_set(&rdev->corrected_errors, n);
2721 static struct rdev_sysfs_entry rdev_errors =
2722 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
2725 slot_show(struct md_rdev *rdev, char *page)
2727 if (test_bit(Journal, &rdev->flags))
2728 return sprintf(page, "journal\n");
2729 else if (rdev->raid_disk < 0)
2730 return sprintf(page, "none\n");
2732 return sprintf(page, "%d\n", rdev->raid_disk);
2736 slot_store(struct md_rdev *rdev, const char *buf, size_t len)
2741 if (test_bit(Journal, &rdev->flags))
2743 if (strncmp(buf, "none", 4)==0)
2746 err = kstrtouint(buf, 10, (unsigned int *)&slot);
2750 if (rdev->mddev->pers && slot == -1) {
2751 /* Setting 'slot' on an active array requires also
2752 * updating the 'rd%d' link, and communicating
2753 * with the personality with ->hot_*_disk.
2754 * For now we only support removing
2755 * failed/spare devices. This normally happens automatically,
2756 * but not when the metadata is externally managed.
2758 if (rdev->raid_disk == -1)
2760 /* personality does all needed checks */
2761 if (rdev->mddev->pers->hot_remove_disk == NULL)
2763 clear_bit(Blocked, &rdev->flags);
2764 remove_and_add_spares(rdev->mddev, rdev);
2765 if (rdev->raid_disk >= 0)
2767 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2768 md_wakeup_thread(rdev->mddev->thread);
2769 } else if (rdev->mddev->pers) {
2770 /* Activating a spare .. or possibly reactivating
2771 * if we ever get bitmaps working here.
2774 if (rdev->raid_disk != -1)
2777 if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery))
2780 if (rdev->mddev->pers->hot_add_disk == NULL)
2783 if (slot >= rdev->mddev->raid_disks &&
2784 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
2787 rdev->raid_disk = slot;
2788 if (test_bit(In_sync, &rdev->flags))
2789 rdev->saved_raid_disk = slot;
2791 rdev->saved_raid_disk = -1;
2792 clear_bit(In_sync, &rdev->flags);
2793 clear_bit(Bitmap_sync, &rdev->flags);
2794 remove_and_add_spares(rdev->mddev, rdev);
2795 if (rdev->raid_disk == -1)
2797 /* don't wakeup anyone, leave that to userspace. */
2799 if (slot >= rdev->mddev->raid_disks &&
2800 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
2802 rdev->raid_disk = slot;
2803 /* assume it is working */
2804 clear_bit(Faulty, &rdev->flags);
2805 clear_bit(WriteMostly, &rdev->flags);
2806 set_bit(In_sync, &rdev->flags);
2807 sysfs_notify_dirent_safe(rdev->sysfs_state);
2812 static struct rdev_sysfs_entry rdev_slot =
2813 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
2816 offset_show(struct md_rdev *rdev, char *page)
2818 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
2822 offset_store(struct md_rdev *rdev, const char *buf, size_t len)
2824 unsigned long long offset;
2825 if (kstrtoull(buf, 10, &offset) < 0)
2827 if (rdev->mddev->pers && rdev->raid_disk >= 0)
2829 if (rdev->sectors && rdev->mddev->external)
2830 /* Must set offset before size, so overlap checks
2833 rdev->data_offset = offset;
2834 rdev->new_data_offset = offset;
2838 static struct rdev_sysfs_entry rdev_offset =
2839 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
2841 static ssize_t new_offset_show(struct md_rdev *rdev, char *page)
2843 return sprintf(page, "%llu\n",
2844 (unsigned long long)rdev->new_data_offset);
2847 static ssize_t new_offset_store(struct md_rdev *rdev,
2848 const char *buf, size_t len)
2850 unsigned long long new_offset;
2851 struct mddev *mddev = rdev->mddev;
2853 if (kstrtoull(buf, 10, &new_offset) < 0)
2856 if (mddev->sync_thread ||
2857 test_bit(MD_RECOVERY_RUNNING,&mddev->recovery))
2859 if (new_offset == rdev->data_offset)
2860 /* reset is always permitted */
2862 else if (new_offset > rdev->data_offset) {
2863 /* must not push array size beyond rdev_sectors */
2864 if (new_offset - rdev->data_offset
2865 + mddev->dev_sectors > rdev->sectors)
2868 /* Metadata worries about other space details. */
2870 /* decreasing the offset is inconsistent with a backwards
2873 if (new_offset < rdev->data_offset &&
2874 mddev->reshape_backwards)
2876 /* Increasing offset is inconsistent with forwards
2877 * reshape. reshape_direction should be set to
2878 * 'backwards' first.
2880 if (new_offset > rdev->data_offset &&
2881 !mddev->reshape_backwards)
2884 if (mddev->pers && mddev->persistent &&
2885 !super_types[mddev->major_version]
2886 .allow_new_offset(rdev, new_offset))
2888 rdev->new_data_offset = new_offset;
2889 if (new_offset > rdev->data_offset)
2890 mddev->reshape_backwards = 1;
2891 else if (new_offset < rdev->data_offset)
2892 mddev->reshape_backwards = 0;
2896 static struct rdev_sysfs_entry rdev_new_offset =
2897 __ATTR(new_offset, S_IRUGO|S_IWUSR, new_offset_show, new_offset_store);
2900 rdev_size_show(struct md_rdev *rdev, char *page)
2902 return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2);
2905 static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
2907 /* check if two start/length pairs overlap */
2915 static int strict_blocks_to_sectors(const char *buf, sector_t *sectors)
2917 unsigned long long blocks;
2920 if (kstrtoull(buf, 10, &blocks) < 0)
2923 if (blocks & 1ULL << (8 * sizeof(blocks) - 1))
2924 return -EINVAL; /* sector conversion overflow */
2927 if (new != blocks * 2)
2928 return -EINVAL; /* unsigned long long to sector_t overflow */
2935 rdev_size_store(struct md_rdev *rdev, const char *buf, size_t len)
2937 struct mddev *my_mddev = rdev->mddev;
2938 sector_t oldsectors = rdev->sectors;
2941 if (test_bit(Journal, &rdev->flags))
2943 if (strict_blocks_to_sectors(buf, §ors) < 0)
2945 if (rdev->data_offset != rdev->new_data_offset)
2946 return -EINVAL; /* too confusing */
2947 if (my_mddev->pers && rdev->raid_disk >= 0) {
2948 if (my_mddev->persistent) {
2949 sectors = super_types[my_mddev->major_version].
2950 rdev_size_change(rdev, sectors);
2953 } else if (!sectors)
2954 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) -
2956 if (!my_mddev->pers->resize)
2957 /* Cannot change size for RAID0 or Linear etc */
2960 if (sectors < my_mddev->dev_sectors)
2961 return -EINVAL; /* component must fit device */
2963 rdev->sectors = sectors;
2964 if (sectors > oldsectors && my_mddev->external) {
2965 /* Need to check that all other rdevs with the same
2966 * ->bdev do not overlap. 'rcu' is sufficient to walk
2967 * the rdev lists safely.
2968 * This check does not provide a hard guarantee, it
2969 * just helps avoid dangerous mistakes.
2971 struct mddev *mddev;
2973 struct list_head *tmp;
2976 for_each_mddev(mddev, tmp) {
2977 struct md_rdev *rdev2;
2979 rdev_for_each(rdev2, mddev)
2980 if (rdev->bdev == rdev2->bdev &&
2982 overlaps(rdev->data_offset, rdev->sectors,
2995 /* Someone else could have slipped in a size
2996 * change here, but doing so is just silly.
2997 * We put oldsectors back because we *know* it is
2998 * safe, and trust userspace not to race with
3001 rdev->sectors = oldsectors;
3008 static struct rdev_sysfs_entry rdev_size =
3009 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
3011 static ssize_t recovery_start_show(struct md_rdev *rdev, char *page)
3013 unsigned long long recovery_start = rdev->recovery_offset;
3015 if (test_bit(In_sync, &rdev->flags) ||
3016 recovery_start == MaxSector)
3017 return sprintf(page, "none\n");
3019 return sprintf(page, "%llu\n", recovery_start);
3022 static ssize_t recovery_start_store(struct md_rdev *rdev, const char *buf, size_t len)
3024 unsigned long long recovery_start;
3026 if (cmd_match(buf, "none"))
3027 recovery_start = MaxSector;
3028 else if (kstrtoull(buf, 10, &recovery_start))
3031 if (rdev->mddev->pers &&
3032 rdev->raid_disk >= 0)
3035 rdev->recovery_offset = recovery_start;
3036 if (recovery_start == MaxSector)
3037 set_bit(In_sync, &rdev->flags);
3039 clear_bit(In_sync, &rdev->flags);
3043 static struct rdev_sysfs_entry rdev_recovery_start =
3044 __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store);
3046 /* sysfs access to bad-blocks list.
3047 * We present two files.
3048 * 'bad-blocks' lists sector numbers and lengths of ranges that
3049 * are recorded as bad. The list is truncated to fit within
3050 * the one-page limit of sysfs.
3051 * Writing "sector length" to this file adds an acknowledged
3053 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
3054 * been acknowledged. Writing to this file adds bad blocks
3055 * without acknowledging them. This is largely for testing.
3057 static ssize_t bb_show(struct md_rdev *rdev, char *page)
3059 return badblocks_show(&rdev->badblocks, page, 0);
3061 static ssize_t bb_store(struct md_rdev *rdev, const char *page, size_t len)
3063 int rv = badblocks_store(&rdev->badblocks, page, len, 0);
3064 /* Maybe that ack was all we needed */
3065 if (test_and_clear_bit(BlockedBadBlocks, &rdev->flags))
3066 wake_up(&rdev->blocked_wait);
3069 static struct rdev_sysfs_entry rdev_bad_blocks =
3070 __ATTR(bad_blocks, S_IRUGO|S_IWUSR, bb_show, bb_store);
3072 static ssize_t ubb_show(struct md_rdev *rdev, char *page)
3074 return badblocks_show(&rdev->badblocks, page, 1);
3076 static ssize_t ubb_store(struct md_rdev *rdev, const char *page, size_t len)
3078 return badblocks_store(&rdev->badblocks, page, len, 1);
3080 static struct rdev_sysfs_entry rdev_unack_bad_blocks =
3081 __ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store);
3083 static struct attribute *rdev_default_attrs[] = {
3088 &rdev_new_offset.attr,
3090 &rdev_recovery_start.attr,
3091 &rdev_bad_blocks.attr,
3092 &rdev_unack_bad_blocks.attr,
3096 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
3098 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3099 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3105 return entry->show(rdev, page);
3109 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
3110 const char *page, size_t length)
3112 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3113 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3115 struct mddev *mddev = rdev->mddev;
3119 if (!capable(CAP_SYS_ADMIN))
3121 rv = mddev ? mddev_lock(mddev): -EBUSY;
3123 if (rdev->mddev == NULL)
3126 rv = entry->store(rdev, page, length);
3127 mddev_unlock(mddev);
3132 static void rdev_free(struct kobject *ko)
3134 struct md_rdev *rdev = container_of(ko, struct md_rdev, kobj);
3137 static const struct sysfs_ops rdev_sysfs_ops = {
3138 .show = rdev_attr_show,
3139 .store = rdev_attr_store,
3141 static struct kobj_type rdev_ktype = {
3142 .release = rdev_free,
3143 .sysfs_ops = &rdev_sysfs_ops,
3144 .default_attrs = rdev_default_attrs,
3147 int md_rdev_init(struct md_rdev *rdev)
3150 rdev->saved_raid_disk = -1;
3151 rdev->raid_disk = -1;
3153 rdev->data_offset = 0;
3154 rdev->new_data_offset = 0;
3155 rdev->sb_events = 0;
3156 rdev->last_read_error.tv_sec = 0;
3157 rdev->last_read_error.tv_nsec = 0;
3158 rdev->sb_loaded = 0;
3159 rdev->bb_page = NULL;
3160 atomic_set(&rdev->nr_pending, 0);
3161 atomic_set(&rdev->read_errors, 0);
3162 atomic_set(&rdev->corrected_errors, 0);
3164 INIT_LIST_HEAD(&rdev->same_set);
3165 init_waitqueue_head(&rdev->blocked_wait);
3167 /* Add space to store bad block list.
3168 * This reserves the space even on arrays where it cannot
3169 * be used - I wonder if that matters
3171 return badblocks_init(&rdev->badblocks, 0);
3173 EXPORT_SYMBOL_GPL(md_rdev_init);
3175 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3177 * mark the device faulty if:
3179 * - the device is nonexistent (zero size)
3180 * - the device has no valid superblock
3182 * a faulty rdev _never_ has rdev->sb set.
3184 static struct md_rdev *md_import_device(dev_t newdev, int super_format, int super_minor)
3186 char b[BDEVNAME_SIZE];
3188 struct md_rdev *rdev;
3191 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
3193 printk(KERN_ERR "md: could not alloc mem for new device!\n");
3194 return ERR_PTR(-ENOMEM);
3197 err = md_rdev_init(rdev);
3200 err = alloc_disk_sb(rdev);
3204 err = lock_rdev(rdev, newdev, super_format == -2);
3208 kobject_init(&rdev->kobj, &rdev_ktype);
3210 size = i_size_read(rdev->bdev->bd_inode) >> BLOCK_SIZE_BITS;
3213 "md: %s has zero or unknown size, marking faulty!\n",
3214 bdevname(rdev->bdev,b));
3219 if (super_format >= 0) {
3220 err = super_types[super_format].
3221 load_super(rdev, NULL, super_minor);
3222 if (err == -EINVAL) {
3224 "md: %s does not have a valid v%d.%d "
3225 "superblock, not importing!\n",
3226 bdevname(rdev->bdev,b),
3227 super_format, super_minor);
3232 "md: could not read %s's sb, not importing!\n",
3233 bdevname(rdev->bdev,b));
3243 md_rdev_clear(rdev);
3245 return ERR_PTR(err);
3249 * Check a full RAID array for plausibility
3252 static void analyze_sbs(struct mddev *mddev)
3255 struct md_rdev *rdev, *freshest, *tmp;
3256 char b[BDEVNAME_SIZE];
3259 rdev_for_each_safe(rdev, tmp, mddev)
3260 switch (super_types[mddev->major_version].
3261 load_super(rdev, freshest, mddev->minor_version)) {
3269 "md: fatal superblock inconsistency in %s"
3270 " -- removing from array\n",
3271 bdevname(rdev->bdev,b));
3272 md_kick_rdev_from_array(rdev);
3275 super_types[mddev->major_version].
3276 validate_super(mddev, freshest);
3279 rdev_for_each_safe(rdev, tmp, mddev) {
3280 if (mddev->max_disks &&
3281 (rdev->desc_nr >= mddev->max_disks ||
3282 i > mddev->max_disks)) {
3284 "md: %s: %s: only %d devices permitted\n",
3285 mdname(mddev), bdevname(rdev->bdev, b),
3287 md_kick_rdev_from_array(rdev);
3290 if (rdev != freshest) {
3291 if (super_types[mddev->major_version].
3292 validate_super(mddev, rdev)) {
3293 printk(KERN_WARNING "md: kicking non-fresh %s"
3295 bdevname(rdev->bdev,b));
3296 md_kick_rdev_from_array(rdev);
3300 if (mddev->level == LEVEL_MULTIPATH) {
3301 rdev->desc_nr = i++;
3302 rdev->raid_disk = rdev->desc_nr;
3303 set_bit(In_sync, &rdev->flags);
3304 } else if (rdev->raid_disk >=
3305 (mddev->raid_disks - min(0, mddev->delta_disks)) &&
3306 !test_bit(Journal, &rdev->flags)) {
3307 rdev->raid_disk = -1;
3308 clear_bit(In_sync, &rdev->flags);
3313 /* Read a fixed-point number.
3314 * Numbers in sysfs attributes should be in "standard" units where
3315 * possible, so time should be in seconds.
3316 * However we internally use a a much smaller unit such as
3317 * milliseconds or jiffies.
3318 * This function takes a decimal number with a possible fractional
3319 * component, and produces an integer which is the result of
3320 * multiplying that number by 10^'scale'.
3321 * all without any floating-point arithmetic.
3323 int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale)
3325 unsigned long result = 0;
3327 while (isdigit(*cp) || (*cp == '.' && decimals < 0)) {
3330 else if (decimals < scale) {
3333 result = result * 10 + value;
3345 while (decimals < scale) {
3354 safe_delay_show(struct mddev *mddev, char *page)
3356 int msec = (mddev->safemode_delay*1000)/HZ;
3357 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
3360 safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len)
3364 if (mddev_is_clustered(mddev)) {
3365 pr_info("md: Safemode is disabled for clustered mode\n");
3369 if (strict_strtoul_scaled(cbuf, &msec, 3) < 0)
3372 mddev->safemode_delay = 0;
3374 unsigned long old_delay = mddev->safemode_delay;
3375 unsigned long new_delay = (msec*HZ)/1000;
3379 mddev->safemode_delay = new_delay;
3380 if (new_delay < old_delay || old_delay == 0)
3381 mod_timer(&mddev->safemode_timer, jiffies+1);
3385 static struct md_sysfs_entry md_safe_delay =
3386 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
3389 level_show(struct mddev *mddev, char *page)
3391 struct md_personality *p;
3393 spin_lock(&mddev->lock);
3396 ret = sprintf(page, "%s\n", p->name);
3397 else if (mddev->clevel[0])
3398 ret = sprintf(page, "%s\n", mddev->clevel);
3399 else if (mddev->level != LEVEL_NONE)
3400 ret = sprintf(page, "%d\n", mddev->level);
3403 spin_unlock(&mddev->lock);
3408 level_store(struct mddev *mddev, const char *buf, size_t len)
3413 struct md_personality *pers, *oldpers;
3415 void *priv, *oldpriv;
3416 struct md_rdev *rdev;
3418 if (slen == 0 || slen >= sizeof(clevel))
3421 rv = mddev_lock(mddev);
3425 if (mddev->pers == NULL) {
3426 strncpy(mddev->clevel, buf, slen);
3427 if (mddev->clevel[slen-1] == '\n')
3429 mddev->clevel[slen] = 0;
3430 mddev->level = LEVEL_NONE;
3438 /* request to change the personality. Need to ensure:
3439 * - array is not engaged in resync/recovery/reshape
3440 * - old personality can be suspended
3441 * - new personality will access other array.
3445 if (mddev->sync_thread ||
3446 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3447 mddev->reshape_position != MaxSector ||
3448 mddev->sysfs_active)
3452 if (!mddev->pers->quiesce) {
3453 printk(KERN_WARNING "md: %s: %s does not support online personality change\n",
3454 mdname(mddev), mddev->pers->name);
3458 /* Now find the new personality */
3459 strncpy(clevel, buf, slen);
3460 if (clevel[slen-1] == '\n')
3463 if (kstrtol(clevel, 10, &level))
3466 if (request_module("md-%s", clevel) != 0)
3467 request_module("md-level-%s", clevel);
3468 spin_lock(&pers_lock);
3469 pers = find_pers(level, clevel);
3470 if (!pers || !try_module_get(pers->owner)) {
3471 spin_unlock(&pers_lock);
3472 printk(KERN_WARNING "md: personality %s not loaded\n", clevel);
3476 spin_unlock(&pers_lock);
3478 if (pers == mddev->pers) {
3479 /* Nothing to do! */
3480 module_put(pers->owner);
3484 if (!pers->takeover) {
3485 module_put(pers->owner);
3486 printk(KERN_WARNING "md: %s: %s does not support personality takeover\n",
3487 mdname(mddev), clevel);
3492 rdev_for_each(rdev, mddev)
3493 rdev->new_raid_disk = rdev->raid_disk;
3495 /* ->takeover must set new_* and/or delta_disks
3496 * if it succeeds, and may set them when it fails.
3498 priv = pers->takeover(mddev);
3500 mddev->new_level = mddev->level;
3501 mddev->new_layout = mddev->layout;
3502 mddev->new_chunk_sectors = mddev->chunk_sectors;
3503 mddev->raid_disks -= mddev->delta_disks;
3504 mddev->delta_disks = 0;
3505 mddev->reshape_backwards = 0;
3506 module_put(pers->owner);
3507 printk(KERN_WARNING "md: %s: %s would not accept array\n",
3508 mdname(mddev), clevel);
3513 /* Looks like we have a winner */
3514 mddev_suspend(mddev);
3515 mddev_detach(mddev);
3517 spin_lock(&mddev->lock);
3518 oldpers = mddev->pers;
3519 oldpriv = mddev->private;
3521 mddev->private = priv;
3522 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
3523 mddev->level = mddev->new_level;
3524 mddev->layout = mddev->new_layout;
3525 mddev->chunk_sectors = mddev->new_chunk_sectors;
3526 mddev->delta_disks = 0;
3527 mddev->reshape_backwards = 0;
3528 mddev->degraded = 0;
3529 spin_unlock(&mddev->lock);
3531 if (oldpers->sync_request == NULL &&
3533 /* We are converting from a no-redundancy array
3534 * to a redundancy array and metadata is managed
3535 * externally so we need to be sure that writes
3536 * won't block due to a need to transition
3538 * until external management is started.
3541 mddev->safemode_delay = 0;
3542 mddev->safemode = 0;
3545 oldpers->free(mddev, oldpriv);
3547 if (oldpers->sync_request == NULL &&
3548 pers->sync_request != NULL) {
3549 /* need to add the md_redundancy_group */
3550 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
3552 "md: cannot register extra attributes for %s\n",
3554 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action");
3556 if (oldpers->sync_request != NULL &&
3557 pers->sync_request == NULL) {
3558 /* need to remove the md_redundancy_group */
3559 if (mddev->to_remove == NULL)
3560 mddev->to_remove = &md_redundancy_group;
3563 rdev_for_each(rdev, mddev) {
3564 if (rdev->raid_disk < 0)
3566 if (rdev->new_raid_disk >= mddev->raid_disks)
3567 rdev->new_raid_disk = -1;
3568 if (rdev->new_raid_disk == rdev->raid_disk)
3570 sysfs_unlink_rdev(mddev, rdev);
3572 rdev_for_each(rdev, mddev) {
3573 if (rdev->raid_disk < 0)
3575 if (rdev->new_raid_disk == rdev->raid_disk)
3577 rdev->raid_disk = rdev->new_raid_disk;
3578 if (rdev->raid_disk < 0)
3579 clear_bit(In_sync, &rdev->flags);
3581 if (sysfs_link_rdev(mddev, rdev))
3582 printk(KERN_WARNING "md: cannot register rd%d"
3583 " for %s after level change\n",
3584 rdev->raid_disk, mdname(mddev));
3588 if (pers->sync_request == NULL) {
3589 /* this is now an array without redundancy, so
3590 * it must always be in_sync
3593 del_timer_sync(&mddev->safemode_timer);
3595 blk_set_stacking_limits(&mddev->queue->limits);
3597 set_bit(MD_CHANGE_DEVS, &mddev->flags);
3598 mddev_resume(mddev);
3600 md_update_sb(mddev, 1);
3601 sysfs_notify(&mddev->kobj, NULL, "level");
3602 md_new_event(mddev);
3605 mddev_unlock(mddev);
3609 static struct md_sysfs_entry md_level =
3610 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
3613 layout_show(struct mddev *mddev, char *page)
3615 /* just a number, not meaningful for all levels */
3616 if (mddev->reshape_position != MaxSector &&
3617 mddev->layout != mddev->new_layout)
3618 return sprintf(page, "%d (%d)\n",
3619 mddev->new_layout, mddev->layout);
3620 return sprintf(page, "%d\n", mddev->layout);
3624 layout_store(struct mddev *mddev, const char *buf, size_t len)
3629 err = kstrtouint(buf, 10, &n);
3632 err = mddev_lock(mddev);
3637 if (mddev->pers->check_reshape == NULL)
3642 mddev->new_layout = n;
3643 err = mddev->pers->check_reshape(mddev);
3645 mddev->new_layout = mddev->layout;
3648 mddev->new_layout = n;
3649 if (mddev->reshape_position == MaxSector)
3652 mddev_unlock(mddev);
3655 static struct md_sysfs_entry md_layout =
3656 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
3659 raid_disks_show(struct mddev *mddev, char *page)
3661 if (mddev->raid_disks == 0)
3663 if (mddev->reshape_position != MaxSector &&
3664 mddev->delta_disks != 0)
3665 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
3666 mddev->raid_disks - mddev->delta_disks);
3667 return sprintf(page, "%d\n", mddev->raid_disks);
3670 static int update_raid_disks(struct mddev *mddev, int raid_disks);
3673 raid_disks_store(struct mddev *mddev, const char *buf, size_t len)
3678 err = kstrtouint(buf, 10, &n);
3682 err = mddev_lock(mddev);
3686 err = update_raid_disks(mddev, n);
3687 else if (mddev->reshape_position != MaxSector) {
3688 struct md_rdev *rdev;
3689 int olddisks = mddev->raid_disks - mddev->delta_disks;
3692 rdev_for_each(rdev, mddev) {
3694 rdev->data_offset < rdev->new_data_offset)
3697 rdev->data_offset > rdev->new_data_offset)
3701 mddev->delta_disks = n - olddisks;
3702 mddev->raid_disks = n;
3703 mddev->reshape_backwards = (mddev->delta_disks < 0);
3705 mddev->raid_disks = n;
3707 mddev_unlock(mddev);
3708 return err ? err : len;
3710 static struct md_sysfs_entry md_raid_disks =
3711 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
3714 chunk_size_show(struct mddev *mddev, char *page)
3716 if (mddev->reshape_position != MaxSector &&
3717 mddev->chunk_sectors != mddev->new_chunk_sectors)
3718 return sprintf(page, "%d (%d)\n",
3719 mddev->new_chunk_sectors << 9,
3720 mddev->chunk_sectors << 9);
3721 return sprintf(page, "%d\n", mddev->chunk_sectors << 9);
3725 chunk_size_store(struct mddev *mddev, const char *buf, size_t len)
3730 err = kstrtoul(buf, 10, &n);
3734 err = mddev_lock(mddev);
3738 if (mddev->pers->check_reshape == NULL)
3743 mddev->new_chunk_sectors = n >> 9;
3744 err = mddev->pers->check_reshape(mddev);
3746 mddev->new_chunk_sectors = mddev->chunk_sectors;
3749 mddev->new_chunk_sectors = n >> 9;
3750 if (mddev->reshape_position == MaxSector)
3751 mddev->chunk_sectors = n >> 9;
3753 mddev_unlock(mddev);
3756 static struct md_sysfs_entry md_chunk_size =
3757 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
3760 resync_start_show(struct mddev *mddev, char *page)
3762 if (mddev->recovery_cp == MaxSector)
3763 return sprintf(page, "none\n");
3764 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
3768 resync_start_store(struct mddev *mddev, const char *buf, size_t len)
3770 unsigned long long n;
3773 if (cmd_match(buf, "none"))
3776 err = kstrtoull(buf, 10, &n);
3779 if (n != (sector_t)n)
3783 err = mddev_lock(mddev);
3786 if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
3790 mddev->recovery_cp = n;
3792 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
3794 mddev_unlock(mddev);
3797 static struct md_sysfs_entry md_resync_start =
3798 __ATTR_PREALLOC(resync_start, S_IRUGO|S_IWUSR,
3799 resync_start_show, resync_start_store);
3802 * The array state can be:
3805 * No devices, no size, no level
3806 * Equivalent to STOP_ARRAY ioctl
3808 * May have some settings, but array is not active
3809 * all IO results in error
3810 * When written, doesn't tear down array, but just stops it
3811 * suspended (not supported yet)
3812 * All IO requests will block. The array can be reconfigured.
3813 * Writing this, if accepted, will block until array is quiescent
3815 * no resync can happen. no superblocks get written.
3816 * write requests fail
3818 * like readonly, but behaves like 'clean' on a write request.
3820 * clean - no pending writes, but otherwise active.
3821 * When written to inactive array, starts without resync
3822 * If a write request arrives then
3823 * if metadata is known, mark 'dirty' and switch to 'active'.
3824 * if not known, block and switch to write-pending
3825 * If written to an active array that has pending writes, then fails.
3827 * fully active: IO and resync can be happening.
3828 * When written to inactive array, starts with resync
3831 * clean, but writes are blocked waiting for 'active' to be written.
3834 * like active, but no writes have been seen for a while (100msec).
3837 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
3838 write_pending, active_idle, bad_word};
3839 static char *array_states[] = {
3840 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3841 "write-pending", "active-idle", NULL };
3843 static int match_word(const char *word, char **list)
3846 for (n=0; list[n]; n++)
3847 if (cmd_match(word, list[n]))
3853 array_state_show(struct mddev *mddev, char *page)
3855 enum array_state st = inactive;
3868 else if (test_bit(MD_CHANGE_PENDING, &mddev->flags))
3870 else if (mddev->safemode)
3876 if (list_empty(&mddev->disks) &&
3877 mddev->raid_disks == 0 &&
3878 mddev->dev_sectors == 0)
3883 return sprintf(page, "%s\n", array_states[st]);
3886 static int do_md_stop(struct mddev *mddev, int ro, struct block_device *bdev);
3887 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev);
3888 static int do_md_run(struct mddev *mddev);
3889 static int restart_array(struct mddev *mddev);
3892 array_state_store(struct mddev *mddev, const char *buf, size_t len)
3895 enum array_state st = match_word(buf, array_states);
3897 if (mddev->pers && (st == active || st == clean) && mddev->ro != 1) {
3898 /* don't take reconfig_mutex when toggling between
3901 spin_lock(&mddev->lock);
3903 restart_array(mddev);
3904 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
3905 wake_up(&mddev->sb_wait);
3907 } else /* st == clean */ {
3908 restart_array(mddev);
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);
3920 spin_unlock(&mddev->lock);
3923 err = mddev_lock(mddev);
3931 /* stopping an active array */
3932 err = do_md_stop(mddev, 0, NULL);
3935 /* stopping an active array */
3937 err = do_md_stop(mddev, 2, NULL);
3939 err = 0; /* already inactive */
3942 break; /* not supported yet */
3945 err = md_set_readonly(mddev, NULL);
3948 set_disk_ro(mddev->gendisk, 1);
3949 err = do_md_run(mddev);
3955 err = md_set_readonly(mddev, NULL);
3956 else if (mddev->ro == 1)
3957 err = restart_array(mddev);
3960 set_disk_ro(mddev->gendisk, 0);
3964 err = do_md_run(mddev);
3969 err = restart_array(mddev);
3972 spin_lock(&mddev->lock);
3973 if (atomic_read(&mddev->writes_pending) == 0) {
3974 if (mddev->in_sync == 0) {
3976 if (mddev->safemode == 1)
3977 mddev->safemode = 0;
3978 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
3983 spin_unlock(&mddev->lock);
3989 err = restart_array(mddev);
3992 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
3993 wake_up(&mddev->sb_wait);
3997 set_disk_ro(mddev->gendisk, 0);
3998 err = do_md_run(mddev);
4003 /* these cannot be set */
4008 if (mddev->hold_active == UNTIL_IOCTL)
4009 mddev->hold_active = 0;
4010 sysfs_notify_dirent_safe(mddev->sysfs_state);
4012 mddev_unlock(mddev);
4015 static struct md_sysfs_entry md_array_state =
4016 __ATTR_PREALLOC(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
4019 max_corrected_read_errors_show(struct mddev *mddev, char *page) {
4020 return sprintf(page, "%d\n",
4021 atomic_read(&mddev->max_corr_read_errors));
4025 max_corrected_read_errors_store(struct mddev *mddev, const char *buf, size_t len)
4030 rv = kstrtouint(buf, 10, &n);
4033 atomic_set(&mddev->max_corr_read_errors, n);
4037 static struct md_sysfs_entry max_corr_read_errors =
4038 __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show,
4039 max_corrected_read_errors_store);
4042 null_show(struct mddev *mddev, char *page)
4048 new_dev_store(struct mddev *mddev, const char *buf, size_t len)
4050 /* buf must be %d:%d\n? giving major and minor numbers */
4051 /* The new device is added to the array.
4052 * If the array has a persistent superblock, we read the
4053 * superblock to initialise info and check validity.
4054 * Otherwise, only checking done is that in bind_rdev_to_array,
4055 * which mainly checks size.
4058 int major = simple_strtoul(buf, &e, 10);
4061 struct md_rdev *rdev;
4064 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
4066 minor = simple_strtoul(e+1, &e, 10);
4067 if (*e && *e != '\n')
4069 dev = MKDEV(major, minor);
4070 if (major != MAJOR(dev) ||
4071 minor != MINOR(dev))
4074 flush_workqueue(md_misc_wq);
4076 err = mddev_lock(mddev);
4079 if (mddev->persistent) {
4080 rdev = md_import_device(dev, mddev->major_version,
4081 mddev->minor_version);
4082 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
4083 struct md_rdev *rdev0
4084 = list_entry(mddev->disks.next,
4085 struct md_rdev, same_set);
4086 err = super_types[mddev->major_version]
4087 .load_super(rdev, rdev0, mddev->minor_version);
4091 } else if (mddev->external)
4092 rdev = md_import_device(dev, -2, -1);
4094 rdev = md_import_device(dev, -1, -1);
4097 mddev_unlock(mddev);
4098 return PTR_ERR(rdev);
4100 err = bind_rdev_to_array(rdev, mddev);
4104 mddev_unlock(mddev);
4105 return err ? err : len;
4108 static struct md_sysfs_entry md_new_device =
4109 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
4112 bitmap_store(struct mddev *mddev, const char *buf, size_t len)
4115 unsigned long chunk, end_chunk;
4118 err = mddev_lock(mddev);
4123 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
4125 chunk = end_chunk = simple_strtoul(buf, &end, 0);
4126 if (buf == end) break;
4127 if (*end == '-') { /* range */
4129 end_chunk = simple_strtoul(buf, &end, 0);
4130 if (buf == end) break;
4132 if (*end && !isspace(*end)) break;
4133 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
4134 buf = skip_spaces(end);
4136 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
4138 mddev_unlock(mddev);
4142 static struct md_sysfs_entry md_bitmap =
4143 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
4146 size_show(struct mddev *mddev, char *page)
4148 return sprintf(page, "%llu\n",
4149 (unsigned long long)mddev->dev_sectors / 2);
4152 static int update_size(struct mddev *mddev, sector_t num_sectors);
4155 size_store(struct mddev *mddev, const char *buf, size_t len)
4157 /* If array is inactive, we can reduce the component size, but
4158 * not increase it (except from 0).
4159 * If array is active, we can try an on-line resize
4162 int err = strict_blocks_to_sectors(buf, §ors);
4166 err = mddev_lock(mddev);
4170 err = update_size(mddev, sectors);
4171 md_update_sb(mddev, 1);
4173 if (mddev->dev_sectors == 0 ||
4174 mddev->dev_sectors > sectors)
4175 mddev->dev_sectors = sectors;
4179 mddev_unlock(mddev);
4180 return err ? err : len;
4183 static struct md_sysfs_entry md_size =
4184 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
4186 /* Metadata version.
4188 * 'none' for arrays with no metadata (good luck...)
4189 * 'external' for arrays with externally managed metadata,
4190 * or N.M for internally known formats
4193 metadata_show(struct mddev *mddev, char *page)
4195 if (mddev->persistent)
4196 return sprintf(page, "%d.%d\n",
4197 mddev->major_version, mddev->minor_version);
4198 else if (mddev->external)
4199 return sprintf(page, "external:%s\n", mddev->metadata_type);
4201 return sprintf(page, "none\n");
4205 metadata_store(struct mddev *mddev, const char *buf, size_t len)
4210 /* Changing the details of 'external' metadata is
4211 * always permitted. Otherwise there must be
4212 * no devices attached to the array.
4215 err = mddev_lock(mddev);
4219 if (mddev->external && strncmp(buf, "external:", 9) == 0)
4221 else if (!list_empty(&mddev->disks))
4225 if (cmd_match(buf, "none")) {
4226 mddev->persistent = 0;
4227 mddev->external = 0;
4228 mddev->major_version = 0;
4229 mddev->minor_version = 90;
4232 if (strncmp(buf, "external:", 9) == 0) {
4233 size_t namelen = len-9;
4234 if (namelen >= sizeof(mddev->metadata_type))
4235 namelen = sizeof(mddev->metadata_type)-1;
4236 strncpy(mddev->metadata_type, buf+9, namelen);
4237 mddev->metadata_type[namelen] = 0;
4238 if (namelen && mddev->metadata_type[namelen-1] == '\n')
4239 mddev->metadata_type[--namelen] = 0;
4240 mddev->persistent = 0;
4241 mddev->external = 1;
4242 mddev->major_version = 0;
4243 mddev->minor_version = 90;
4246 major = simple_strtoul(buf, &e, 10);
4248 if (e==buf || *e != '.')
4251 minor = simple_strtoul(buf, &e, 10);
4252 if (e==buf || (*e && *e != '\n') )
4255 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
4257 mddev->major_version = major;
4258 mddev->minor_version = minor;
4259 mddev->persistent = 1;
4260 mddev->external = 0;
4263 mddev_unlock(mddev);
4267 static struct md_sysfs_entry md_metadata =
4268 __ATTR_PREALLOC(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
4271 action_show(struct mddev *mddev, char *page)
4273 char *type = "idle";
4274 unsigned long recovery = mddev->recovery;
4275 if (test_bit(MD_RECOVERY_FROZEN, &recovery))
4277 else if (test_bit(MD_RECOVERY_RUNNING, &recovery) ||
4278 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &recovery))) {
4279 if (test_bit(MD_RECOVERY_RESHAPE, &recovery))
4281 else if (test_bit(MD_RECOVERY_SYNC, &recovery)) {
4282 if (!test_bit(MD_RECOVERY_REQUESTED, &recovery))
4284 else if (test_bit(MD_RECOVERY_CHECK, &recovery))
4288 } else if (test_bit(MD_RECOVERY_RECOVER, &recovery))
4290 else if (mddev->reshape_position != MaxSector)
4293 return sprintf(page, "%s\n", type);
4297 action_store(struct mddev *mddev, const char *page, size_t len)
4299 if (!mddev->pers || !mddev->pers->sync_request)
4303 if (cmd_match(page, "idle") || cmd_match(page, "frozen")) {
4304 if (cmd_match(page, "frozen"))
4305 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4307 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4308 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
4309 mddev_lock(mddev) == 0) {
4310 flush_workqueue(md_misc_wq);
4311 if (mddev->sync_thread) {
4312 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4313 md_reap_sync_thread(mddev);
4315 mddev_unlock(mddev);
4317 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
4318 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
4320 else if (cmd_match(page, "resync"))
4321 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4322 else if (cmd_match(page, "recover")) {
4323 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4324 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
4325 } else if (cmd_match(page, "reshape")) {
4327 if (mddev->pers->start_reshape == NULL)
4329 err = mddev_lock(mddev);
4331 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4332 err = mddev->pers->start_reshape(mddev);
4333 mddev_unlock(mddev);
4337 sysfs_notify(&mddev->kobj, NULL, "degraded");
4339 if (cmd_match(page, "check"))
4340 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
4341 else if (!cmd_match(page, "repair"))
4343 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4344 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
4345 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
4347 if (mddev->ro == 2) {
4348 /* A write to sync_action is enough to justify
4349 * canceling read-auto mode
4352 md_wakeup_thread(mddev->sync_thread);
4354 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4355 md_wakeup_thread(mddev->thread);
4356 sysfs_notify_dirent_safe(mddev->sysfs_action);
4360 static struct md_sysfs_entry md_scan_mode =
4361 __ATTR_PREALLOC(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
4364 last_sync_action_show(struct mddev *mddev, char *page)
4366 return sprintf(page, "%s\n", mddev->last_sync_action);
4369 static struct md_sysfs_entry md_last_scan_mode = __ATTR_RO(last_sync_action);
4372 mismatch_cnt_show(struct mddev *mddev, char *page)
4374 return sprintf(page, "%llu\n",
4375 (unsigned long long)
4376 atomic64_read(&mddev->resync_mismatches));
4379 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
4382 sync_min_show(struct mddev *mddev, char *page)
4384 return sprintf(page, "%d (%s)\n", speed_min(mddev),
4385 mddev->sync_speed_min ? "local": "system");
4389 sync_min_store(struct mddev *mddev, const char *buf, size_t len)
4394 if (strncmp(buf, "system", 6)==0) {
4397 rv = kstrtouint(buf, 10, &min);
4403 mddev->sync_speed_min = min;
4407 static struct md_sysfs_entry md_sync_min =
4408 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
4411 sync_max_show(struct mddev *mddev, char *page)
4413 return sprintf(page, "%d (%s)\n", speed_max(mddev),
4414 mddev->sync_speed_max ? "local": "system");
4418 sync_max_store(struct mddev *mddev, const char *buf, size_t len)
4423 if (strncmp(buf, "system", 6)==0) {
4426 rv = kstrtouint(buf, 10, &max);
4432 mddev->sync_speed_max = max;
4436 static struct md_sysfs_entry md_sync_max =
4437 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
4440 degraded_show(struct mddev *mddev, char *page)
4442 return sprintf(page, "%d\n", mddev->degraded);
4444 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
4447 sync_force_parallel_show(struct mddev *mddev, char *page)
4449 return sprintf(page, "%d\n", mddev->parallel_resync);
4453 sync_force_parallel_store(struct mddev *mddev, const char *buf, size_t len)
4457 if (kstrtol(buf, 10, &n))
4460 if (n != 0 && n != 1)
4463 mddev->parallel_resync = n;
4465 if (mddev->sync_thread)
4466 wake_up(&resync_wait);
4471 /* force parallel resync, even with shared block devices */
4472 static struct md_sysfs_entry md_sync_force_parallel =
4473 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
4474 sync_force_parallel_show, sync_force_parallel_store);
4477 sync_speed_show(struct mddev *mddev, char *page)
4479 unsigned long resync, dt, db;
4480 if (mddev->curr_resync == 0)
4481 return sprintf(page, "none\n");
4482 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
4483 dt = (jiffies - mddev->resync_mark) / HZ;
4485 db = resync - mddev->resync_mark_cnt;
4486 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
4489 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
4492 sync_completed_show(struct mddev *mddev, char *page)
4494 unsigned long long max_sectors, resync;
4496 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4497 return sprintf(page, "none\n");
4499 if (mddev->curr_resync == 1 ||
4500 mddev->curr_resync == 2)
4501 return sprintf(page, "delayed\n");
4503 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
4504 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
4505 max_sectors = mddev->resync_max_sectors;
4507 max_sectors = mddev->dev_sectors;
4509 resync = mddev->curr_resync_completed;
4510 return sprintf(page, "%llu / %llu\n", resync, max_sectors);
4513 static struct md_sysfs_entry md_sync_completed =
4514 __ATTR_PREALLOC(sync_completed, S_IRUGO, sync_completed_show, NULL);
4517 min_sync_show(struct mddev *mddev, char *page)
4519 return sprintf(page, "%llu\n",
4520 (unsigned long long)mddev->resync_min);
4523 min_sync_store(struct mddev *mddev, const char *buf, size_t len)
4525 unsigned long long min;
4528 if (kstrtoull(buf, 10, &min))
4531 spin_lock(&mddev->lock);
4533 if (min > mddev->resync_max)
4537 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4540 /* Round down to multiple of 4K for safety */
4541 mddev->resync_min = round_down(min, 8);
4545 spin_unlock(&mddev->lock);
4549 static struct md_sysfs_entry md_min_sync =
4550 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
4553 max_sync_show(struct mddev *mddev, char *page)
4555 if (mddev->resync_max == MaxSector)
4556 return sprintf(page, "max\n");
4558 return sprintf(page, "%llu\n",
4559 (unsigned long long)mddev->resync_max);
4562 max_sync_store(struct mddev *mddev, const char *buf, size_t len)
4565 spin_lock(&mddev->lock);
4566 if (strncmp(buf, "max", 3) == 0)
4567 mddev->resync_max = MaxSector;
4569 unsigned long long max;
4573 if (kstrtoull(buf, 10, &max))
4575 if (max < mddev->resync_min)
4579 if (max < mddev->resync_max &&
4581 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4584 /* Must be a multiple of chunk_size */
4585 chunk = mddev->chunk_sectors;
4587 sector_t temp = max;
4590 if (sector_div(temp, chunk))
4593 mddev->resync_max = max;
4595 wake_up(&mddev->recovery_wait);
4598 spin_unlock(&mddev->lock);
4602 static struct md_sysfs_entry md_max_sync =
4603 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
4606 suspend_lo_show(struct mddev *mddev, char *page)
4608 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
4612 suspend_lo_store(struct mddev *mddev, const char *buf, size_t len)
4614 unsigned long long old, new;
4617 err = kstrtoull(buf, 10, &new);
4620 if (new != (sector_t)new)
4623 err = mddev_lock(mddev);
4627 if (mddev->pers == NULL ||
4628 mddev->pers->quiesce == NULL)
4630 old = mddev->suspend_lo;
4631 mddev->suspend_lo = new;
4633 /* Shrinking suspended region */
4634 mddev->pers->quiesce(mddev, 2);
4636 /* Expanding suspended region - need to wait */
4637 mddev->pers->quiesce(mddev, 1);
4638 mddev->pers->quiesce(mddev, 0);
4642 mddev_unlock(mddev);
4645 static struct md_sysfs_entry md_suspend_lo =
4646 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
4649 suspend_hi_show(struct mddev *mddev, char *page)
4651 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
4655 suspend_hi_store(struct mddev *mddev, const char *buf, size_t len)
4657 unsigned long long old, new;
4660 err = kstrtoull(buf, 10, &new);
4663 if (new != (sector_t)new)
4666 err = mddev_lock(mddev);
4670 if (mddev->pers == NULL ||
4671 mddev->pers->quiesce == NULL)
4673 old = mddev->suspend_hi;
4674 mddev->suspend_hi = new;
4676 /* Shrinking suspended region */
4677 mddev->pers->quiesce(mddev, 2);
4679 /* Expanding suspended region - need to wait */
4680 mddev->pers->quiesce(mddev, 1);
4681 mddev->pers->quiesce(mddev, 0);
4685 mddev_unlock(mddev);
4688 static struct md_sysfs_entry md_suspend_hi =
4689 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
4692 reshape_position_show(struct mddev *mddev, char *page)
4694 if (mddev->reshape_position != MaxSector)
4695 return sprintf(page, "%llu\n",
4696 (unsigned long long)mddev->reshape_position);
4697 strcpy(page, "none\n");
4702 reshape_position_store(struct mddev *mddev, const char *buf, size_t len)
4704 struct md_rdev *rdev;
4705 unsigned long long new;
4708 err = kstrtoull(buf, 10, &new);
4711 if (new != (sector_t)new)
4713 err = mddev_lock(mddev);
4719 mddev->reshape_position = new;
4720 mddev->delta_disks = 0;
4721 mddev->reshape_backwards = 0;
4722 mddev->new_level = mddev->level;
4723 mddev->new_layout = mddev->layout;
4724 mddev->new_chunk_sectors = mddev->chunk_sectors;
4725 rdev_for_each(rdev, mddev)
4726 rdev->new_data_offset = rdev->data_offset;
4729 mddev_unlock(mddev);
4733 static struct md_sysfs_entry md_reshape_position =
4734 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
4735 reshape_position_store);
4738 reshape_direction_show(struct mddev *mddev, char *page)
4740 return sprintf(page, "%s\n",
4741 mddev->reshape_backwards ? "backwards" : "forwards");
4745 reshape_direction_store(struct mddev *mddev, const char *buf, size_t len)
4750 if (cmd_match(buf, "forwards"))
4752 else if (cmd_match(buf, "backwards"))
4756 if (mddev->reshape_backwards == backwards)
4759 err = mddev_lock(mddev);
4762 /* check if we are allowed to change */
4763 if (mddev->delta_disks)
4765 else if (mddev->persistent &&
4766 mddev->major_version == 0)
4769 mddev->reshape_backwards = backwards;
4770 mddev_unlock(mddev);
4774 static struct md_sysfs_entry md_reshape_direction =
4775 __ATTR(reshape_direction, S_IRUGO|S_IWUSR, reshape_direction_show,
4776 reshape_direction_store);
4779 array_size_show(struct mddev *mddev, char *page)
4781 if (mddev->external_size)
4782 return sprintf(page, "%llu\n",
4783 (unsigned long long)mddev->array_sectors/2);
4785 return sprintf(page, "default\n");
4789 array_size_store(struct mddev *mddev, const char *buf, size_t len)
4794 err = mddev_lock(mddev);
4798 if (strncmp(buf, "default", 7) == 0) {
4800 sectors = mddev->pers->size(mddev, 0, 0);
4802 sectors = mddev->array_sectors;
4804 mddev->external_size = 0;
4806 if (strict_blocks_to_sectors(buf, §ors) < 0)
4808 else if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors)
4811 mddev->external_size = 1;
4815 mddev->array_sectors = sectors;
4817 set_capacity(mddev->gendisk, mddev->array_sectors);
4818 revalidate_disk(mddev->gendisk);
4821 mddev_unlock(mddev);
4825 static struct md_sysfs_entry md_array_size =
4826 __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show,
4829 static struct attribute *md_default_attrs[] = {
4832 &md_raid_disks.attr,
4833 &md_chunk_size.attr,
4835 &md_resync_start.attr,
4837 &md_new_device.attr,
4838 &md_safe_delay.attr,
4839 &md_array_state.attr,
4840 &md_reshape_position.attr,
4841 &md_reshape_direction.attr,
4842 &md_array_size.attr,
4843 &max_corr_read_errors.attr,
4847 static struct attribute *md_redundancy_attrs[] = {
4849 &md_last_scan_mode.attr,
4850 &md_mismatches.attr,
4853 &md_sync_speed.attr,
4854 &md_sync_force_parallel.attr,
4855 &md_sync_completed.attr,
4858 &md_suspend_lo.attr,
4859 &md_suspend_hi.attr,
4864 static struct attribute_group md_redundancy_group = {
4866 .attrs = md_redundancy_attrs,
4870 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
4872 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
4873 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
4878 spin_lock(&all_mddevs_lock);
4879 if (list_empty(&mddev->all_mddevs)) {
4880 spin_unlock(&all_mddevs_lock);
4884 spin_unlock(&all_mddevs_lock);
4886 rv = entry->show(mddev, page);
4892 md_attr_store(struct kobject *kobj, struct attribute *attr,
4893 const char *page, size_t length)
4895 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
4896 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
4901 if (!capable(CAP_SYS_ADMIN))
4903 spin_lock(&all_mddevs_lock);
4904 if (list_empty(&mddev->all_mddevs)) {
4905 spin_unlock(&all_mddevs_lock);
4909 spin_unlock(&all_mddevs_lock);
4910 rv = entry->store(mddev, page, length);
4915 static void md_free(struct kobject *ko)
4917 struct mddev *mddev = container_of(ko, struct mddev, kobj);
4919 if (mddev->sysfs_state)
4920 sysfs_put(mddev->sysfs_state);
4923 blk_cleanup_queue(mddev->queue);
4924 if (mddev->gendisk) {
4925 del_gendisk(mddev->gendisk);
4926 put_disk(mddev->gendisk);
4932 static const struct sysfs_ops md_sysfs_ops = {
4933 .show = md_attr_show,
4934 .store = md_attr_store,
4936 static struct kobj_type md_ktype = {
4938 .sysfs_ops = &md_sysfs_ops,
4939 .default_attrs = md_default_attrs,
4944 static void mddev_delayed_delete(struct work_struct *ws)
4946 struct mddev *mddev = container_of(ws, struct mddev, del_work);
4948 sysfs_remove_group(&mddev->kobj, &md_bitmap_group);
4949 kobject_del(&mddev->kobj);
4950 kobject_put(&mddev->kobj);
4953 static int md_alloc(dev_t dev, char *name)
4955 static DEFINE_MUTEX(disks_mutex);
4956 struct mddev *mddev = mddev_find(dev);
4957 struct gendisk *disk;
4966 partitioned = (MAJOR(mddev->unit) != MD_MAJOR);
4967 shift = partitioned ? MdpMinorShift : 0;
4968 unit = MINOR(mddev->unit) >> shift;
4970 /* wait for any previous instance of this device to be
4971 * completely removed (mddev_delayed_delete).
4973 flush_workqueue(md_misc_wq);
4975 mutex_lock(&disks_mutex);
4981 /* Need to ensure that 'name' is not a duplicate.
4983 struct mddev *mddev2;
4984 spin_lock(&all_mddevs_lock);
4986 list_for_each_entry(mddev2, &all_mddevs, all_mddevs)
4987 if (mddev2->gendisk &&
4988 strcmp(mddev2->gendisk->disk_name, name) == 0) {
4989 spin_unlock(&all_mddevs_lock);
4992 spin_unlock(&all_mddevs_lock);
4996 mddev->queue = blk_alloc_queue(GFP_KERNEL);
4999 mddev->queue->queuedata = mddev;
5001 blk_queue_make_request(mddev->queue, md_make_request);
5002 blk_set_stacking_limits(&mddev->queue->limits);
5004 disk = alloc_disk(1 << shift);
5006 blk_cleanup_queue(mddev->queue);
5007 mddev->queue = NULL;
5010 disk->major = MAJOR(mddev->unit);
5011 disk->first_minor = unit << shift;
5013 strcpy(disk->disk_name, name);
5014 else if (partitioned)
5015 sprintf(disk->disk_name, "md_d%d", unit);
5017 sprintf(disk->disk_name, "md%d", unit);
5018 disk->fops = &md_fops;
5019 disk->private_data = mddev;
5020 disk->queue = mddev->queue;
5021 blk_queue_flush(mddev->queue, REQ_FLUSH | REQ_FUA);
5022 /* Allow extended partitions. This makes the
5023 * 'mdp' device redundant, but we can't really
5026 disk->flags |= GENHD_FL_EXT_DEVT;
5027 mddev->gendisk = disk;
5028 /* As soon as we call add_disk(), another thread could get
5029 * through to md_open, so make sure it doesn't get too far
5031 mutex_lock(&mddev->open_mutex);
5034 error = kobject_init_and_add(&mddev->kobj, &md_ktype,
5035 &disk_to_dev(disk)->kobj, "%s", "md");
5037 /* This isn't possible, but as kobject_init_and_add is marked
5038 * __must_check, we must do something with the result
5040 printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
5044 if (mddev->kobj.sd &&
5045 sysfs_create_group(&mddev->kobj, &md_bitmap_group))
5046 printk(KERN_DEBUG "pointless warning\n");
5047 mutex_unlock(&mddev->open_mutex);
5049 mutex_unlock(&disks_mutex);
5050 if (!error && mddev->kobj.sd) {
5051 kobject_uevent(&mddev->kobj, KOBJ_ADD);
5052 mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state");
5058 static struct kobject *md_probe(dev_t dev, int *part, void *data)
5060 md_alloc(dev, NULL);
5064 static int add_named_array(const char *val, struct kernel_param *kp)
5066 /* val must be "md_*" where * is not all digits.
5067 * We allocate an array with a large free minor number, and
5068 * set the name to val. val must not already be an active name.
5070 int len = strlen(val);
5071 char buf[DISK_NAME_LEN];
5073 while (len && val[len-1] == '\n')
5075 if (len >= DISK_NAME_LEN)
5077 strlcpy(buf, val, len+1);
5078 if (strncmp(buf, "md_", 3) != 0)
5080 return md_alloc(0, buf);
5083 static void md_safemode_timeout(unsigned long data)
5085 struct mddev *mddev = (struct mddev *) data;
5087 if (!atomic_read(&mddev->writes_pending)) {
5088 mddev->safemode = 1;
5089 if (mddev->external)
5090 sysfs_notify_dirent_safe(mddev->sysfs_state);
5092 md_wakeup_thread(mddev->thread);
5095 static int start_dirty_degraded;
5097 int md_run(struct mddev *mddev)
5100 struct md_rdev *rdev;
5101 struct md_personality *pers;
5103 if (list_empty(&mddev->disks))
5104 /* cannot run an array with no devices.. */
5109 /* Cannot run until previous stop completes properly */
5110 if (mddev->sysfs_active)
5114 * Analyze all RAID superblock(s)
5116 if (!mddev->raid_disks) {
5117 if (!mddev->persistent)
5122 if (mddev->level != LEVEL_NONE)
5123 request_module("md-level-%d", mddev->level);
5124 else if (mddev->clevel[0])
5125 request_module("md-%s", mddev->clevel);
5128 * Drop all container device buffers, from now on
5129 * the only valid external interface is through the md
5132 rdev_for_each(rdev, mddev) {
5133 if (test_bit(Faulty, &rdev->flags))
5135 sync_blockdev(rdev->bdev);
5136 invalidate_bdev(rdev->bdev);
5138 /* perform some consistency tests on the device.
5139 * We don't want the data to overlap the metadata,
5140 * Internal Bitmap issues have been handled elsewhere.
5142 if (rdev->meta_bdev) {
5143 /* Nothing to check */;
5144 } else if (rdev->data_offset < rdev->sb_start) {
5145 if (mddev->dev_sectors &&
5146 rdev->data_offset + mddev->dev_sectors
5148 printk("md: %s: data overlaps metadata\n",
5153 if (rdev->sb_start + rdev->sb_size/512
5154 > rdev->data_offset) {
5155 printk("md: %s: metadata overlaps data\n",
5160 sysfs_notify_dirent_safe(rdev->sysfs_state);
5163 if (mddev->bio_set == NULL)
5164 mddev->bio_set = bioset_create(BIO_POOL_SIZE, 0);
5166 spin_lock(&pers_lock);
5167 pers = find_pers(mddev->level, mddev->clevel);
5168 if (!pers || !try_module_get(pers->owner)) {
5169 spin_unlock(&pers_lock);
5170 if (mddev->level != LEVEL_NONE)
5171 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
5174 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
5178 spin_unlock(&pers_lock);
5179 if (mddev->level != pers->level) {
5180 mddev->level = pers->level;
5181 mddev->new_level = pers->level;
5183 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
5185 if (mddev->reshape_position != MaxSector &&
5186 pers->start_reshape == NULL) {
5187 /* This personality cannot handle reshaping... */
5188 module_put(pers->owner);
5192 if (pers->sync_request) {
5193 /* Warn if this is a potentially silly
5196 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
5197 struct md_rdev *rdev2;
5200 rdev_for_each(rdev, mddev)
5201 rdev_for_each(rdev2, mddev) {
5203 rdev->bdev->bd_contains ==
5204 rdev2->bdev->bd_contains) {
5206 "%s: WARNING: %s appears to be"
5207 " on the same physical disk as"
5210 bdevname(rdev->bdev,b),
5211 bdevname(rdev2->bdev,b2));
5218 "True protection against single-disk"
5219 " failure might be compromised.\n");
5222 mddev->recovery = 0;
5223 /* may be over-ridden by personality */
5224 mddev->resync_max_sectors = mddev->dev_sectors;
5226 mddev->ok_start_degraded = start_dirty_degraded;
5228 if (start_readonly && mddev->ro == 0)
5229 mddev->ro = 2; /* read-only, but switch on first write */
5231 err = pers->run(mddev);
5233 printk(KERN_ERR "md: pers->run() failed ...\n");
5234 else if (pers->size(mddev, 0, 0) < mddev->array_sectors) {
5235 WARN_ONCE(!mddev->external_size, "%s: default size too small,"
5236 " but 'external_size' not in effect?\n", __func__);
5238 "md: invalid array_size %llu > default size %llu\n",
5239 (unsigned long long)mddev->array_sectors / 2,
5240 (unsigned long long)pers->size(mddev, 0, 0) / 2);
5243 if (err == 0 && pers->sync_request &&
5244 (mddev->bitmap_info.file || mddev->bitmap_info.offset)) {
5245 struct bitmap *bitmap;
5247 bitmap = bitmap_create(mddev, -1);
5248 if (IS_ERR(bitmap)) {
5249 err = PTR_ERR(bitmap);
5250 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
5251 mdname(mddev), err);
5253 mddev->bitmap = bitmap;
5257 mddev_detach(mddev);
5259 pers->free(mddev, mddev->private);
5260 mddev->private = NULL;
5261 module_put(pers->owner);
5262 bitmap_destroy(mddev);
5266 mddev->queue->backing_dev_info.congested_data = mddev;
5267 mddev->queue->backing_dev_info.congested_fn = md_congested;
5269 if (pers->sync_request) {
5270 if (mddev->kobj.sd &&
5271 sysfs_create_group(&mddev->kobj, &md_redundancy_group))
5273 "md: cannot register extra attributes for %s\n",
5275 mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action");
5276 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
5279 atomic_set(&mddev->writes_pending,0);
5280 atomic_set(&mddev->max_corr_read_errors,
5281 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS);
5282 mddev->safemode = 0;
5283 if (mddev_is_clustered(mddev))
5284 mddev->safemode_delay = 0;
5286 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
5289 spin_lock(&mddev->lock);
5292 spin_unlock(&mddev->lock);
5293 rdev_for_each(rdev, mddev)
5294 if (rdev->raid_disk >= 0)
5295 if (sysfs_link_rdev(mddev, rdev))
5296 /* failure here is OK */;
5298 if (mddev->degraded && !mddev->ro)
5299 /* This ensures that recovering status is reported immediately
5300 * via sysfs - until a lack of spares is confirmed.
5302 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
5303 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5305 if (mddev->flags & MD_UPDATE_SB_FLAGS)
5306 md_update_sb(mddev, 0);
5308 md_new_event(mddev);
5309 sysfs_notify_dirent_safe(mddev->sysfs_state);
5310 sysfs_notify_dirent_safe(mddev->sysfs_action);
5311 sysfs_notify(&mddev->kobj, NULL, "degraded");
5314 EXPORT_SYMBOL_GPL(md_run);
5316 static int do_md_run(struct mddev *mddev)
5320 err = md_run(mddev);
5323 err = bitmap_load(mddev);
5325 bitmap_destroy(mddev);
5329 if (mddev_is_clustered(mddev))
5330 md_allow_write(mddev);
5332 md_wakeup_thread(mddev->thread);
5333 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
5335 set_capacity(mddev->gendisk, mddev->array_sectors);
5336 revalidate_disk(mddev->gendisk);
5338 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
5343 static int restart_array(struct mddev *mddev)
5345 struct gendisk *disk = mddev->gendisk;
5347 /* Complain if it has no devices */
5348 if (list_empty(&mddev->disks))
5354 if (test_bit(MD_HAS_JOURNAL, &mddev->flags)) {
5355 struct md_rdev *rdev;
5356 bool has_journal = false;
5359 rdev_for_each_rcu(rdev, mddev) {
5360 if (test_bit(Journal, &rdev->flags) &&
5361 !test_bit(Faulty, &rdev->flags)) {
5368 /* Don't restart rw with journal missing/faulty */
5373 mddev->safemode = 0;
5375 set_disk_ro(disk, 0);
5376 printk(KERN_INFO "md: %s switched to read-write mode.\n",
5378 /* Kick recovery or resync if necessary */
5379 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5380 md_wakeup_thread(mddev->thread);
5381 md_wakeup_thread(mddev->sync_thread);
5382 sysfs_notify_dirent_safe(mddev->sysfs_state);
5386 static void md_clean(struct mddev *mddev)
5388 mddev->array_sectors = 0;
5389 mddev->external_size = 0;
5390 mddev->dev_sectors = 0;
5391 mddev->raid_disks = 0;
5392 mddev->recovery_cp = 0;
5393 mddev->resync_min = 0;
5394 mddev->resync_max = MaxSector;
5395 mddev->reshape_position = MaxSector;
5396 mddev->external = 0;
5397 mddev->persistent = 0;
5398 mddev->level = LEVEL_NONE;
5399 mddev->clevel[0] = 0;
5402 mddev->metadata_type[0] = 0;
5403 mddev->chunk_sectors = 0;
5404 mddev->ctime = mddev->utime = 0;
5406 mddev->max_disks = 0;
5408 mddev->can_decrease_events = 0;
5409 mddev->delta_disks = 0;
5410 mddev->reshape_backwards = 0;
5411 mddev->new_level = LEVEL_NONE;
5412 mddev->new_layout = 0;
5413 mddev->new_chunk_sectors = 0;
5414 mddev->curr_resync = 0;
5415 atomic64_set(&mddev->resync_mismatches, 0);
5416 mddev->suspend_lo = mddev->suspend_hi = 0;
5417 mddev->sync_speed_min = mddev->sync_speed_max = 0;
5418 mddev->recovery = 0;
5421 mddev->degraded = 0;
5422 mddev->safemode = 0;
5423 mddev->private = NULL;
5424 mddev->bitmap_info.offset = 0;
5425 mddev->bitmap_info.default_offset = 0;
5426 mddev->bitmap_info.default_space = 0;
5427 mddev->bitmap_info.chunksize = 0;
5428 mddev->bitmap_info.daemon_sleep = 0;
5429 mddev->bitmap_info.max_write_behind = 0;
5432 static void __md_stop_writes(struct mddev *mddev)
5434 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5435 flush_workqueue(md_misc_wq);
5436 if (mddev->sync_thread) {
5437 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5438 md_reap_sync_thread(mddev);
5441 del_timer_sync(&mddev->safemode_timer);
5443 bitmap_flush(mddev);
5444 md_super_wait(mddev);
5446 if (mddev->ro == 0 &&
5447 ((!mddev->in_sync && !mddev_is_clustered(mddev)) ||
5448 (mddev->flags & MD_UPDATE_SB_FLAGS))) {
5449 /* mark array as shutdown cleanly */
5450 if (!mddev_is_clustered(mddev))
5452 md_update_sb(mddev, 1);
5456 void md_stop_writes(struct mddev *mddev)
5458 mddev_lock_nointr(mddev);
5459 __md_stop_writes(mddev);
5460 mddev_unlock(mddev);
5462 EXPORT_SYMBOL_GPL(md_stop_writes);
5464 static void mddev_detach(struct mddev *mddev)
5466 struct bitmap *bitmap = mddev->bitmap;
5467 /* wait for behind writes to complete */
5468 if (bitmap && atomic_read(&bitmap->behind_writes) > 0) {
5469 printk(KERN_INFO "md:%s: behind writes in progress - waiting to stop.\n",
5471 /* need to kick something here to make sure I/O goes? */
5472 wait_event(bitmap->behind_wait,
5473 atomic_read(&bitmap->behind_writes) == 0);
5475 if (mddev->pers && mddev->pers->quiesce) {
5476 mddev->pers->quiesce(mddev, 1);
5477 mddev->pers->quiesce(mddev, 0);
5479 md_unregister_thread(&mddev->thread);
5481 blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/
5484 static void __md_stop(struct mddev *mddev)
5486 struct md_personality *pers = mddev->pers;
5487 mddev_detach(mddev);
5488 /* Ensure ->event_work is done */
5489 flush_workqueue(md_misc_wq);
5490 spin_lock(&mddev->lock);
5493 spin_unlock(&mddev->lock);
5494 pers->free(mddev, mddev->private);
5495 mddev->private = NULL;
5496 if (pers->sync_request && mddev->to_remove == NULL)
5497 mddev->to_remove = &md_redundancy_group;
5498 module_put(pers->owner);
5499 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5502 void md_stop(struct mddev *mddev)
5504 /* stop the array and free an attached data structures.
5505 * This is called from dm-raid
5508 bitmap_destroy(mddev);
5510 bioset_free(mddev->bio_set);
5513 EXPORT_SYMBOL_GPL(md_stop);
5515 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev)
5520 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
5522 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5523 md_wakeup_thread(mddev->thread);
5525 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5526 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5527 if (mddev->sync_thread)
5528 /* Thread might be blocked waiting for metadata update
5529 * which will now never happen */
5530 wake_up_process(mddev->sync_thread->tsk);
5532 if (mddev->external && test_bit(MD_CHANGE_PENDING, &mddev->flags))
5534 mddev_unlock(mddev);
5535 wait_event(resync_wait, !test_bit(MD_RECOVERY_RUNNING,
5537 wait_event(mddev->sb_wait,
5538 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
5539 mddev_lock_nointr(mddev);
5541 mutex_lock(&mddev->open_mutex);
5542 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
5543 mddev->sync_thread ||
5544 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
5545 (bdev && !test_bit(MD_STILL_CLOSED, &mddev->flags))) {
5546 printk("md: %s still in use.\n",mdname(mddev));
5548 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5549 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5550 md_wakeup_thread(mddev->thread);
5556 __md_stop_writes(mddev);
5562 set_disk_ro(mddev->gendisk, 1);
5563 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5564 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5565 md_wakeup_thread(mddev->thread);
5566 sysfs_notify_dirent_safe(mddev->sysfs_state);
5570 mutex_unlock(&mddev->open_mutex);
5575 * 0 - completely stop and dis-assemble array
5576 * 2 - stop but do not disassemble array
5578 static int do_md_stop(struct mddev *mddev, int mode,
5579 struct block_device *bdev)
5581 struct gendisk *disk = mddev->gendisk;
5582 struct md_rdev *rdev;
5585 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
5587 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5588 md_wakeup_thread(mddev->thread);
5590 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5591 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5592 if (mddev->sync_thread)
5593 /* Thread might be blocked waiting for metadata update
5594 * which will now never happen */
5595 wake_up_process(mddev->sync_thread->tsk);
5597 mddev_unlock(mddev);
5598 wait_event(resync_wait, (mddev->sync_thread == NULL &&
5599 !test_bit(MD_RECOVERY_RUNNING,
5600 &mddev->recovery)));
5601 mddev_lock_nointr(mddev);
5603 mutex_lock(&mddev->open_mutex);
5604 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
5605 mddev->sysfs_active ||
5606 mddev->sync_thread ||
5607 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
5608 (bdev && !test_bit(MD_STILL_CLOSED, &mddev->flags))) {
5609 printk("md: %s still in use.\n",mdname(mddev));
5610 mutex_unlock(&mddev->open_mutex);
5612 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5613 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5614 md_wakeup_thread(mddev->thread);
5620 set_disk_ro(disk, 0);
5622 __md_stop_writes(mddev);
5624 mddev->queue->backing_dev_info.congested_fn = NULL;
5626 /* tell userspace to handle 'inactive' */
5627 sysfs_notify_dirent_safe(mddev->sysfs_state);
5629 rdev_for_each(rdev, mddev)
5630 if (rdev->raid_disk >= 0)
5631 sysfs_unlink_rdev(mddev, rdev);
5633 set_capacity(disk, 0);
5634 mutex_unlock(&mddev->open_mutex);
5636 revalidate_disk(disk);
5641 mutex_unlock(&mddev->open_mutex);
5643 * Free resources if final stop
5646 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
5648 bitmap_destroy(mddev);
5649 if (mddev->bitmap_info.file) {
5650 struct file *f = mddev->bitmap_info.file;
5651 spin_lock(&mddev->lock);
5652 mddev->bitmap_info.file = NULL;
5653 spin_unlock(&mddev->lock);
5656 mddev->bitmap_info.offset = 0;
5658 export_array(mddev);
5661 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
5662 if (mddev->hold_active == UNTIL_STOP)
5663 mddev->hold_active = 0;
5665 md_new_event(mddev);
5666 sysfs_notify_dirent_safe(mddev->sysfs_state);
5671 static void autorun_array(struct mddev *mddev)
5673 struct md_rdev *rdev;
5676 if (list_empty(&mddev->disks))
5679 printk(KERN_INFO "md: running: ");
5681 rdev_for_each(rdev, mddev) {
5682 char b[BDEVNAME_SIZE];
5683 printk("<%s>", bdevname(rdev->bdev,b));
5687 err = do_md_run(mddev);
5689 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
5690 do_md_stop(mddev, 0, NULL);
5695 * lets try to run arrays based on all disks that have arrived
5696 * until now. (those are in pending_raid_disks)
5698 * the method: pick the first pending disk, collect all disks with
5699 * the same UUID, remove all from the pending list and put them into
5700 * the 'same_array' list. Then order this list based on superblock
5701 * update time (freshest comes first), kick out 'old' disks and
5702 * compare superblocks. If everything's fine then run it.
5704 * If "unit" is allocated, then bump its reference count
5706 static void autorun_devices(int part)
5708 struct md_rdev *rdev0, *rdev, *tmp;
5709 struct mddev *mddev;
5710 char b[BDEVNAME_SIZE];
5712 printk(KERN_INFO "md: autorun ...\n");
5713 while (!list_empty(&pending_raid_disks)) {
5716 LIST_HEAD(candidates);
5717 rdev0 = list_entry(pending_raid_disks.next,
5718 struct md_rdev, same_set);
5720 printk(KERN_INFO "md: considering %s ...\n",
5721 bdevname(rdev0->bdev,b));
5722 INIT_LIST_HEAD(&candidates);
5723 rdev_for_each_list(rdev, tmp, &pending_raid_disks)
5724 if (super_90_load(rdev, rdev0, 0) >= 0) {
5725 printk(KERN_INFO "md: adding %s ...\n",
5726 bdevname(rdev->bdev,b));
5727 list_move(&rdev->same_set, &candidates);
5730 * now we have a set of devices, with all of them having
5731 * mostly sane superblocks. It's time to allocate the
5735 dev = MKDEV(mdp_major,
5736 rdev0->preferred_minor << MdpMinorShift);
5737 unit = MINOR(dev) >> MdpMinorShift;
5739 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
5742 if (rdev0->preferred_minor != unit) {
5743 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
5744 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
5748 md_probe(dev, NULL, NULL);
5749 mddev = mddev_find(dev);
5750 if (!mddev || !mddev->gendisk) {
5754 "md: cannot allocate memory for md drive.\n");
5757 if (mddev_lock(mddev))
5758 printk(KERN_WARNING "md: %s locked, cannot run\n",
5760 else if (mddev->raid_disks || mddev->major_version
5761 || !list_empty(&mddev->disks)) {
5763 "md: %s already running, cannot run %s\n",
5764 mdname(mddev), bdevname(rdev0->bdev,b));
5765 mddev_unlock(mddev);
5767 printk(KERN_INFO "md: created %s\n", mdname(mddev));
5768 mddev->persistent = 1;
5769 rdev_for_each_list(rdev, tmp, &candidates) {
5770 list_del_init(&rdev->same_set);
5771 if (bind_rdev_to_array(rdev, mddev))
5774 autorun_array(mddev);
5775 mddev_unlock(mddev);
5777 /* on success, candidates will be empty, on error
5780 rdev_for_each_list(rdev, tmp, &candidates) {
5781 list_del_init(&rdev->same_set);
5786 printk(KERN_INFO "md: ... autorun DONE.\n");
5788 #endif /* !MODULE */
5790 static int get_version(void __user *arg)
5794 ver.major = MD_MAJOR_VERSION;
5795 ver.minor = MD_MINOR_VERSION;
5796 ver.patchlevel = MD_PATCHLEVEL_VERSION;
5798 if (copy_to_user(arg, &ver, sizeof(ver)))
5804 static int get_array_info(struct mddev *mddev, void __user *arg)
5806 mdu_array_info_t info;
5807 int nr,working,insync,failed,spare;
5808 struct md_rdev *rdev;
5810 nr = working = insync = failed = spare = 0;
5812 rdev_for_each_rcu(rdev, mddev) {
5814 if (test_bit(Faulty, &rdev->flags))
5818 if (test_bit(In_sync, &rdev->flags))
5826 info.major_version = mddev->major_version;
5827 info.minor_version = mddev->minor_version;
5828 info.patch_version = MD_PATCHLEVEL_VERSION;
5829 info.ctime = mddev->ctime;
5830 info.level = mddev->level;
5831 info.size = mddev->dev_sectors / 2;
5832 if (info.size != mddev->dev_sectors / 2) /* overflow */
5835 info.raid_disks = mddev->raid_disks;
5836 info.md_minor = mddev->md_minor;
5837 info.not_persistent= !mddev->persistent;
5839 info.utime = mddev->utime;
5842 info.state = (1<<MD_SB_CLEAN);
5843 if (mddev->bitmap && mddev->bitmap_info.offset)
5844 info.state |= (1<<MD_SB_BITMAP_PRESENT);
5845 if (mddev_is_clustered(mddev))
5846 info.state |= (1<<MD_SB_CLUSTERED);
5847 info.active_disks = insync;
5848 info.working_disks = working;
5849 info.failed_disks = failed;
5850 info.spare_disks = spare;
5852 info.layout = mddev->layout;
5853 info.chunk_size = mddev->chunk_sectors << 9;
5855 if (copy_to_user(arg, &info, sizeof(info)))
5861 static int get_bitmap_file(struct mddev *mddev, void __user * arg)
5863 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
5867 file = kzalloc(sizeof(*file), GFP_NOIO);
5872 spin_lock(&mddev->lock);
5873 /* bitmap enabled */
5874 if (mddev->bitmap_info.file) {
5875 ptr = file_path(mddev->bitmap_info.file, file->pathname,
5876 sizeof(file->pathname));
5880 memmove(file->pathname, ptr,
5881 sizeof(file->pathname)-(ptr-file->pathname));
5883 spin_unlock(&mddev->lock);
5886 copy_to_user(arg, file, sizeof(*file)))
5893 static int get_disk_info(struct mddev *mddev, void __user * arg)
5895 mdu_disk_info_t info;
5896 struct md_rdev *rdev;
5898 if (copy_from_user(&info, arg, sizeof(info)))
5902 rdev = md_find_rdev_nr_rcu(mddev, info.number);
5904 info.major = MAJOR(rdev->bdev->bd_dev);
5905 info.minor = MINOR(rdev->bdev->bd_dev);
5906 info.raid_disk = rdev->raid_disk;
5908 if (test_bit(Faulty, &rdev->flags))
5909 info.state |= (1<<MD_DISK_FAULTY);
5910 else if (test_bit(In_sync, &rdev->flags)) {
5911 info.state |= (1<<MD_DISK_ACTIVE);
5912 info.state |= (1<<MD_DISK_SYNC);
5914 if (test_bit(Journal, &rdev->flags))
5915 info.state |= (1<<MD_DISK_JOURNAL);
5916 if (test_bit(WriteMostly, &rdev->flags))
5917 info.state |= (1<<MD_DISK_WRITEMOSTLY);
5919 info.major = info.minor = 0;
5920 info.raid_disk = -1;
5921 info.state = (1<<MD_DISK_REMOVED);
5925 if (copy_to_user(arg, &info, sizeof(info)))
5931 static int add_new_disk(struct mddev *mddev, mdu_disk_info_t *info)
5933 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
5934 struct md_rdev *rdev;
5935 dev_t dev = MKDEV(info->major,info->minor);
5937 if (mddev_is_clustered(mddev) &&
5938 !(info->state & ((1 << MD_DISK_CLUSTER_ADD) | (1 << MD_DISK_CANDIDATE)))) {
5939 pr_err("%s: Cannot add to clustered mddev.\n",
5944 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
5947 if (!mddev->raid_disks) {
5949 /* expecting a device which has a superblock */
5950 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
5953 "md: md_import_device returned %ld\n",
5955 return PTR_ERR(rdev);
5957 if (!list_empty(&mddev->disks)) {
5958 struct md_rdev *rdev0
5959 = list_entry(mddev->disks.next,
5960 struct md_rdev, same_set);
5961 err = super_types[mddev->major_version]
5962 .load_super(rdev, rdev0, mddev->minor_version);
5965 "md: %s has different UUID to %s\n",
5966 bdevname(rdev->bdev,b),
5967 bdevname(rdev0->bdev,b2));
5972 err = bind_rdev_to_array(rdev, mddev);
5979 * add_new_disk can be used once the array is assembled
5980 * to add "hot spares". They must already have a superblock
5985 if (!mddev->pers->hot_add_disk) {
5987 "%s: personality does not support diskops!\n",
5991 if (mddev->persistent)
5992 rdev = md_import_device(dev, mddev->major_version,
5993 mddev->minor_version);
5995 rdev = md_import_device(dev, -1, -1);
5998 "md: md_import_device returned %ld\n",
6000 return PTR_ERR(rdev);
6002 /* set saved_raid_disk if appropriate */
6003 if (!mddev->persistent) {
6004 if (info->state & (1<<MD_DISK_SYNC) &&
6005 info->raid_disk < mddev->raid_disks) {
6006 rdev->raid_disk = info->raid_disk;
6007 set_bit(In_sync, &rdev->flags);
6008 clear_bit(Bitmap_sync, &rdev->flags);
6010 rdev->raid_disk = -1;
6011 rdev->saved_raid_disk = rdev->raid_disk;
6013 super_types[mddev->major_version].
6014 validate_super(mddev, rdev);
6015 if ((info->state & (1<<MD_DISK_SYNC)) &&
6016 rdev->raid_disk != info->raid_disk) {
6017 /* This was a hot-add request, but events doesn't
6018 * match, so reject it.
6024 clear_bit(In_sync, &rdev->flags); /* just to be sure */
6025 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
6026 set_bit(WriteMostly, &rdev->flags);
6028 clear_bit(WriteMostly, &rdev->flags);
6030 if (info->state & (1<<MD_DISK_JOURNAL))
6031 set_bit(Journal, &rdev->flags);
6033 * check whether the device shows up in other nodes
6035 if (mddev_is_clustered(mddev)) {
6036 if (info->state & (1 << MD_DISK_CANDIDATE))
6037 set_bit(Candidate, &rdev->flags);
6038 else if (info->state & (1 << MD_DISK_CLUSTER_ADD)) {
6039 /* --add initiated by this node */
6040 err = md_cluster_ops->add_new_disk(mddev, rdev);
6048 rdev->raid_disk = -1;
6049 err = bind_rdev_to_array(rdev, mddev);
6054 if (mddev_is_clustered(mddev)) {
6055 if (info->state & (1 << MD_DISK_CANDIDATE))
6056 md_cluster_ops->new_disk_ack(mddev, (err == 0));
6059 md_cluster_ops->add_new_disk_cancel(mddev);
6061 err = add_bound_rdev(rdev);
6065 err = add_bound_rdev(rdev);
6070 /* otherwise, add_new_disk is only allowed
6071 * for major_version==0 superblocks
6073 if (mddev->major_version != 0) {
6074 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
6079 if (!(info->state & (1<<MD_DISK_FAULTY))) {
6081 rdev = md_import_device(dev, -1, 0);
6084 "md: error, md_import_device() returned %ld\n",
6086 return PTR_ERR(rdev);
6088 rdev->desc_nr = info->number;
6089 if (info->raid_disk < mddev->raid_disks)
6090 rdev->raid_disk = info->raid_disk;
6092 rdev->raid_disk = -1;
6094 if (rdev->raid_disk < mddev->raid_disks)
6095 if (info->state & (1<<MD_DISK_SYNC))
6096 set_bit(In_sync, &rdev->flags);
6098 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
6099 set_bit(WriteMostly, &rdev->flags);
6101 if (!mddev->persistent) {
6102 printk(KERN_INFO "md: nonpersistent superblock ...\n");
6103 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
6105 rdev->sb_start = calc_dev_sboffset(rdev);
6106 rdev->sectors = rdev->sb_start;
6108 err = bind_rdev_to_array(rdev, mddev);
6118 static int hot_remove_disk(struct mddev *mddev, dev_t dev)
6120 char b[BDEVNAME_SIZE];
6121 struct md_rdev *rdev;
6124 rdev = find_rdev(mddev, dev);
6128 if (mddev_is_clustered(mddev))
6129 ret = md_cluster_ops->metadata_update_start(mddev);
6131 if (rdev->raid_disk < 0)
6134 clear_bit(Blocked, &rdev->flags);
6135 remove_and_add_spares(mddev, rdev);
6137 if (rdev->raid_disk >= 0)
6141 if (mddev_is_clustered(mddev) && ret == 0)
6142 md_cluster_ops->remove_disk(mddev, rdev);
6144 md_kick_rdev_from_array(rdev);
6145 md_update_sb(mddev, 1);
6146 md_new_event(mddev);
6150 if (mddev_is_clustered(mddev) && ret == 0)
6151 md_cluster_ops->metadata_update_cancel(mddev);
6153 printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n",
6154 bdevname(rdev->bdev,b), mdname(mddev));
6158 static int hot_add_disk(struct mddev *mddev, dev_t dev)
6160 char b[BDEVNAME_SIZE];
6162 struct md_rdev *rdev;
6167 if (mddev->major_version != 0) {
6168 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
6169 " version-0 superblocks.\n",
6173 if (!mddev->pers->hot_add_disk) {
6175 "%s: personality does not support diskops!\n",
6180 rdev = md_import_device(dev, -1, 0);
6183 "md: error, md_import_device() returned %ld\n",
6188 if (mddev->persistent)
6189 rdev->sb_start = calc_dev_sboffset(rdev);
6191 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
6193 rdev->sectors = rdev->sb_start;
6195 if (test_bit(Faulty, &rdev->flags)) {
6197 "md: can not hot-add faulty %s disk to %s!\n",
6198 bdevname(rdev->bdev,b), mdname(mddev));
6203 clear_bit(In_sync, &rdev->flags);
6205 rdev->saved_raid_disk = -1;
6206 err = bind_rdev_to_array(rdev, mddev);
6211 * The rest should better be atomic, we can have disk failures
6212 * noticed in interrupt contexts ...
6215 rdev->raid_disk = -1;
6217 md_update_sb(mddev, 1);
6219 * Kick recovery, maybe this spare has to be added to the
6220 * array immediately.
6222 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6223 md_wakeup_thread(mddev->thread);
6224 md_new_event(mddev);
6232 static int set_bitmap_file(struct mddev *mddev, int fd)
6237 if (!mddev->pers->quiesce || !mddev->thread)
6239 if (mddev->recovery || mddev->sync_thread)
6241 /* we should be able to change the bitmap.. */
6245 struct inode *inode;
6248 if (mddev->bitmap || mddev->bitmap_info.file)
6249 return -EEXIST; /* cannot add when bitmap is present */
6253 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
6258 inode = f->f_mapping->host;
6259 if (!S_ISREG(inode->i_mode)) {
6260 printk(KERN_ERR "%s: error: bitmap file must be a regular file\n",
6263 } else if (!(f->f_mode & FMODE_WRITE)) {
6264 printk(KERN_ERR "%s: error: bitmap file must open for write\n",
6267 } else if (atomic_read(&inode->i_writecount) != 1) {
6268 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
6276 mddev->bitmap_info.file = f;
6277 mddev->bitmap_info.offset = 0; /* file overrides offset */
6278 } else if (mddev->bitmap == NULL)
6279 return -ENOENT; /* cannot remove what isn't there */
6282 mddev->pers->quiesce(mddev, 1);
6284 struct bitmap *bitmap;
6286 bitmap = bitmap_create(mddev, -1);
6287 if (!IS_ERR(bitmap)) {
6288 mddev->bitmap = bitmap;
6289 err = bitmap_load(mddev);
6291 err = PTR_ERR(bitmap);
6293 if (fd < 0 || err) {
6294 bitmap_destroy(mddev);
6295 fd = -1; /* make sure to put the file */
6297 mddev->pers->quiesce(mddev, 0);
6300 struct file *f = mddev->bitmap_info.file;
6302 spin_lock(&mddev->lock);
6303 mddev->bitmap_info.file = NULL;
6304 spin_unlock(&mddev->lock);
6313 * set_array_info is used two different ways
6314 * The original usage is when creating a new array.
6315 * In this usage, raid_disks is > 0 and it together with
6316 * level, size, not_persistent,layout,chunksize determine the
6317 * shape of the array.
6318 * This will always create an array with a type-0.90.0 superblock.
6319 * The newer usage is when assembling an array.
6320 * In this case raid_disks will be 0, and the major_version field is
6321 * use to determine which style super-blocks are to be found on the devices.
6322 * The minor and patch _version numbers are also kept incase the
6323 * super_block handler wishes to interpret them.
6325 static int set_array_info(struct mddev *mddev, mdu_array_info_t *info)
6328 if (info->raid_disks == 0) {
6329 /* just setting version number for superblock loading */
6330 if (info->major_version < 0 ||
6331 info->major_version >= ARRAY_SIZE(super_types) ||
6332 super_types[info->major_version].name == NULL) {
6333 /* maybe try to auto-load a module? */
6335 "md: superblock version %d not known\n",
6336 info->major_version);
6339 mddev->major_version = info->major_version;
6340 mddev->minor_version = info->minor_version;
6341 mddev->patch_version = info->patch_version;
6342 mddev->persistent = !info->not_persistent;
6343 /* ensure mddev_put doesn't delete this now that there
6344 * is some minimal configuration.
6346 mddev->ctime = get_seconds();
6349 mddev->major_version = MD_MAJOR_VERSION;
6350 mddev->minor_version = MD_MINOR_VERSION;
6351 mddev->patch_version = MD_PATCHLEVEL_VERSION;
6352 mddev->ctime = get_seconds();
6354 mddev->level = info->level;
6355 mddev->clevel[0] = 0;
6356 mddev->dev_sectors = 2 * (sector_t)info->size;
6357 mddev->raid_disks = info->raid_disks;
6358 /* don't set md_minor, it is determined by which /dev/md* was
6361 if (info->state & (1<<MD_SB_CLEAN))
6362 mddev->recovery_cp = MaxSector;
6364 mddev->recovery_cp = 0;
6365 mddev->persistent = ! info->not_persistent;
6366 mddev->external = 0;
6368 mddev->layout = info->layout;
6369 mddev->chunk_sectors = info->chunk_size >> 9;
6371 mddev->max_disks = MD_SB_DISKS;
6373 if (mddev->persistent)
6375 set_bit(MD_CHANGE_DEVS, &mddev->flags);
6377 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
6378 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
6379 mddev->bitmap_info.offset = 0;
6381 mddev->reshape_position = MaxSector;
6384 * Generate a 128 bit UUID
6386 get_random_bytes(mddev->uuid, 16);
6388 mddev->new_level = mddev->level;
6389 mddev->new_chunk_sectors = mddev->chunk_sectors;
6390 mddev->new_layout = mddev->layout;
6391 mddev->delta_disks = 0;
6392 mddev->reshape_backwards = 0;
6397 void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors)
6399 WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__);
6401 if (mddev->external_size)
6404 mddev->array_sectors = array_sectors;
6406 EXPORT_SYMBOL(md_set_array_sectors);
6408 static int update_size(struct mddev *mddev, sector_t num_sectors)
6410 struct md_rdev *rdev;
6412 int fit = (num_sectors == 0);
6414 if (mddev->pers->resize == NULL)
6416 /* The "num_sectors" is the number of sectors of each device that
6417 * is used. This can only make sense for arrays with redundancy.
6418 * linear and raid0 always use whatever space is available. We can only
6419 * consider changing this number if no resync or reconstruction is
6420 * happening, and if the new size is acceptable. It must fit before the
6421 * sb_start or, if that is <data_offset, it must fit before the size
6422 * of each device. If num_sectors is zero, we find the largest size
6425 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
6431 rdev_for_each(rdev, mddev) {
6432 sector_t avail = rdev->sectors;
6434 if (fit && (num_sectors == 0 || num_sectors > avail))
6435 num_sectors = avail;
6436 if (avail < num_sectors)
6439 rv = mddev->pers->resize(mddev, num_sectors);
6441 revalidate_disk(mddev->gendisk);
6445 static int update_raid_disks(struct mddev *mddev, int raid_disks)
6448 struct md_rdev *rdev;
6449 /* change the number of raid disks */
6450 if (mddev->pers->check_reshape == NULL)
6454 if (raid_disks <= 0 ||
6455 (mddev->max_disks && raid_disks >= mddev->max_disks))
6457 if (mddev->sync_thread ||
6458 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
6459 mddev->reshape_position != MaxSector)
6462 rdev_for_each(rdev, mddev) {
6463 if (mddev->raid_disks < raid_disks &&
6464 rdev->data_offset < rdev->new_data_offset)
6466 if (mddev->raid_disks > raid_disks &&
6467 rdev->data_offset > rdev->new_data_offset)
6471 mddev->delta_disks = raid_disks - mddev->raid_disks;
6472 if (mddev->delta_disks < 0)
6473 mddev->reshape_backwards = 1;
6474 else if (mddev->delta_disks > 0)
6475 mddev->reshape_backwards = 0;
6477 rv = mddev->pers->check_reshape(mddev);
6479 mddev->delta_disks = 0;
6480 mddev->reshape_backwards = 0;
6486 * update_array_info is used to change the configuration of an
6488 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
6489 * fields in the info are checked against the array.
6490 * Any differences that cannot be handled will cause an error.
6491 * Normally, only one change can be managed at a time.
6493 static int update_array_info(struct mddev *mddev, mdu_array_info_t *info)
6499 /* calculate expected state,ignoring low bits */
6500 if (mddev->bitmap && mddev->bitmap_info.offset)
6501 state |= (1 << MD_SB_BITMAP_PRESENT);
6503 if (mddev->major_version != info->major_version ||
6504 mddev->minor_version != info->minor_version ||
6505 /* mddev->patch_version != info->patch_version || */
6506 mddev->ctime != info->ctime ||
6507 mddev->level != info->level ||
6508 /* mddev->layout != info->layout || */
6509 mddev->persistent != !info->not_persistent ||
6510 mddev->chunk_sectors != info->chunk_size >> 9 ||
6511 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
6512 ((state^info->state) & 0xfffffe00)
6515 /* Check there is only one change */
6516 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
6518 if (mddev->raid_disks != info->raid_disks)
6520 if (mddev->layout != info->layout)
6522 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT))
6529 if (mddev->layout != info->layout) {
6531 * we don't need to do anything at the md level, the
6532 * personality will take care of it all.
6534 if (mddev->pers->check_reshape == NULL)
6537 mddev->new_layout = info->layout;
6538 rv = mddev->pers->check_reshape(mddev);
6540 mddev->new_layout = mddev->layout;
6544 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
6545 rv = update_size(mddev, (sector_t)info->size * 2);
6547 if (mddev->raid_disks != info->raid_disks)
6548 rv = update_raid_disks(mddev, info->raid_disks);
6550 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
6551 if (mddev->pers->quiesce == NULL || mddev->thread == NULL) {
6555 if (mddev->recovery || mddev->sync_thread) {
6559 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
6560 struct bitmap *bitmap;
6561 /* add the bitmap */
6562 if (mddev->bitmap) {
6566 if (mddev->bitmap_info.default_offset == 0) {
6570 mddev->bitmap_info.offset =
6571 mddev->bitmap_info.default_offset;
6572 mddev->bitmap_info.space =
6573 mddev->bitmap_info.default_space;
6574 mddev->pers->quiesce(mddev, 1);
6575 bitmap = bitmap_create(mddev, -1);
6576 if (!IS_ERR(bitmap)) {
6577 mddev->bitmap = bitmap;
6578 rv = bitmap_load(mddev);
6580 rv = PTR_ERR(bitmap);
6582 bitmap_destroy(mddev);
6583 mddev->pers->quiesce(mddev, 0);
6585 /* remove the bitmap */
6586 if (!mddev->bitmap) {
6590 if (mddev->bitmap->storage.file) {
6594 mddev->pers->quiesce(mddev, 1);
6595 bitmap_destroy(mddev);
6596 mddev->pers->quiesce(mddev, 0);
6597 mddev->bitmap_info.offset = 0;
6600 md_update_sb(mddev, 1);
6606 static int set_disk_faulty(struct mddev *mddev, dev_t dev)
6608 struct md_rdev *rdev;
6611 if (mddev->pers == NULL)
6615 rdev = find_rdev_rcu(mddev, dev);
6619 md_error(mddev, rdev);
6620 if (!test_bit(Faulty, &rdev->flags))
6628 * We have a problem here : there is no easy way to give a CHS
6629 * virtual geometry. We currently pretend that we have a 2 heads
6630 * 4 sectors (with a BIG number of cylinders...). This drives
6631 * dosfs just mad... ;-)
6633 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
6635 struct mddev *mddev = bdev->bd_disk->private_data;
6639 geo->cylinders = mddev->array_sectors / 8;
6643 static inline bool md_ioctl_valid(unsigned int cmd)
6648 case GET_ARRAY_INFO:
6649 case GET_BITMAP_FILE:
6652 case HOT_REMOVE_DISK:
6655 case RESTART_ARRAY_RW:
6657 case SET_ARRAY_INFO:
6658 case SET_BITMAP_FILE:
6659 case SET_DISK_FAULTY:
6662 case CLUSTERED_DISK_NACK:
6669 static int md_ioctl(struct block_device *bdev, fmode_t mode,
6670 unsigned int cmd, unsigned long arg)
6673 void __user *argp = (void __user *)arg;
6674 struct mddev *mddev = NULL;
6677 if (!md_ioctl_valid(cmd))
6682 case GET_ARRAY_INFO:
6686 if (!capable(CAP_SYS_ADMIN))
6691 * Commands dealing with the RAID driver but not any
6696 err = get_version(argp);
6702 autostart_arrays(arg);
6709 * Commands creating/starting a new array:
6712 mddev = bdev->bd_disk->private_data;
6719 /* Some actions do not requires the mutex */
6721 case GET_ARRAY_INFO:
6722 if (!mddev->raid_disks && !mddev->external)
6725 err = get_array_info(mddev, argp);
6729 if (!mddev->raid_disks && !mddev->external)
6732 err = get_disk_info(mddev, argp);
6735 case SET_DISK_FAULTY:
6736 err = set_disk_faulty(mddev, new_decode_dev(arg));
6739 case GET_BITMAP_FILE:
6740 err = get_bitmap_file(mddev, argp);
6745 if (cmd == ADD_NEW_DISK)
6746 /* need to ensure md_delayed_delete() has completed */
6747 flush_workqueue(md_misc_wq);
6749 if (cmd == HOT_REMOVE_DISK)
6750 /* need to ensure recovery thread has run */
6751 wait_event_interruptible_timeout(mddev->sb_wait,
6752 !test_bit(MD_RECOVERY_NEEDED,
6754 msecs_to_jiffies(5000));
6755 if (cmd == STOP_ARRAY || cmd == STOP_ARRAY_RO) {
6756 /* Need to flush page cache, and ensure no-one else opens
6759 mutex_lock(&mddev->open_mutex);
6760 if (mddev->pers && atomic_read(&mddev->openers) > 1) {
6761 mutex_unlock(&mddev->open_mutex);
6765 set_bit(MD_STILL_CLOSED, &mddev->flags);
6766 mutex_unlock(&mddev->open_mutex);
6767 sync_blockdev(bdev);
6769 err = mddev_lock(mddev);
6772 "md: ioctl lock interrupted, reason %d, cmd %d\n",
6777 if (cmd == SET_ARRAY_INFO) {
6778 mdu_array_info_t info;
6780 memset(&info, 0, sizeof(info));
6781 else if (copy_from_user(&info, argp, sizeof(info))) {
6786 err = update_array_info(mddev, &info);
6788 printk(KERN_WARNING "md: couldn't update"
6789 " array info. %d\n", err);
6794 if (!list_empty(&mddev->disks)) {
6796 "md: array %s already has disks!\n",
6801 if (mddev->raid_disks) {
6803 "md: array %s already initialised!\n",
6808 err = set_array_info(mddev, &info);
6810 printk(KERN_WARNING "md: couldn't set"
6811 " array info. %d\n", err);
6818 * Commands querying/configuring an existing array:
6820 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
6821 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
6822 if ((!mddev->raid_disks && !mddev->external)
6823 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
6824 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
6825 && cmd != GET_BITMAP_FILE) {
6831 * Commands even a read-only array can execute:
6834 case RESTART_ARRAY_RW:
6835 err = restart_array(mddev);
6839 err = do_md_stop(mddev, 0, bdev);
6843 err = md_set_readonly(mddev, bdev);
6846 case HOT_REMOVE_DISK:
6847 err = hot_remove_disk(mddev, new_decode_dev(arg));
6851 /* We can support ADD_NEW_DISK on read-only arrays
6852 * on if we are re-adding a preexisting device.
6853 * So require mddev->pers and MD_DISK_SYNC.
6856 mdu_disk_info_t info;
6857 if (copy_from_user(&info, argp, sizeof(info)))
6859 else if (!(info.state & (1<<MD_DISK_SYNC)))
6860 /* Need to clear read-only for this */
6863 err = add_new_disk(mddev, &info);
6869 if (get_user(ro, (int __user *)(arg))) {
6875 /* if the bdev is going readonly the value of mddev->ro
6876 * does not matter, no writes are coming
6881 /* are we are already prepared for writes? */
6885 /* transitioning to readauto need only happen for
6886 * arrays that call md_write_start
6889 err = restart_array(mddev);
6892 set_disk_ro(mddev->gendisk, 0);
6899 * The remaining ioctls are changing the state of the
6900 * superblock, so we do not allow them on read-only arrays.
6902 if (mddev->ro && mddev->pers) {
6903 if (mddev->ro == 2) {
6905 sysfs_notify_dirent_safe(mddev->sysfs_state);
6906 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6907 /* mddev_unlock will wake thread */
6908 /* If a device failed while we were read-only, we
6909 * need to make sure the metadata is updated now.
6911 if (test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
6912 mddev_unlock(mddev);
6913 wait_event(mddev->sb_wait,
6914 !test_bit(MD_CHANGE_DEVS, &mddev->flags) &&
6915 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
6916 mddev_lock_nointr(mddev);
6927 mdu_disk_info_t info;
6928 if (copy_from_user(&info, argp, sizeof(info)))
6931 err = add_new_disk(mddev, &info);
6935 case CLUSTERED_DISK_NACK:
6936 if (mddev_is_clustered(mddev))
6937 md_cluster_ops->new_disk_ack(mddev, false);
6943 err = hot_add_disk(mddev, new_decode_dev(arg));
6947 err = do_md_run(mddev);
6950 case SET_BITMAP_FILE:
6951 err = set_bitmap_file(mddev, (int)arg);
6960 if (mddev->hold_active == UNTIL_IOCTL &&
6962 mddev->hold_active = 0;
6963 mddev_unlock(mddev);
6967 #ifdef CONFIG_COMPAT
6968 static int md_compat_ioctl(struct block_device *bdev, fmode_t mode,
6969 unsigned int cmd, unsigned long arg)
6972 case HOT_REMOVE_DISK:
6974 case SET_DISK_FAULTY:
6975 case SET_BITMAP_FILE:
6976 /* These take in integer arg, do not convert */
6979 arg = (unsigned long)compat_ptr(arg);
6983 return md_ioctl(bdev, mode, cmd, arg);
6985 #endif /* CONFIG_COMPAT */
6987 static int md_open(struct block_device *bdev, fmode_t mode)
6990 * Succeed if we can lock the mddev, which confirms that
6991 * it isn't being stopped right now.
6993 struct mddev *mddev = mddev_find(bdev->bd_dev);
6999 if (mddev->gendisk != bdev->bd_disk) {
7000 /* we are racing with mddev_put which is discarding this
7004 /* Wait until bdev->bd_disk is definitely gone */
7005 flush_workqueue(md_misc_wq);
7006 /* Then retry the open from the top */
7007 return -ERESTARTSYS;
7009 BUG_ON(mddev != bdev->bd_disk->private_data);
7011 if ((err = mutex_lock_interruptible(&mddev->open_mutex)))
7015 atomic_inc(&mddev->openers);
7016 clear_bit(MD_STILL_CLOSED, &mddev->flags);
7017 mutex_unlock(&mddev->open_mutex);
7019 check_disk_change(bdev);
7024 static void md_release(struct gendisk *disk, fmode_t mode)
7026 struct mddev *mddev = disk->private_data;
7029 atomic_dec(&mddev->openers);
7033 static int md_media_changed(struct gendisk *disk)
7035 struct mddev *mddev = disk->private_data;
7037 return mddev->changed;
7040 static int md_revalidate(struct gendisk *disk)
7042 struct mddev *mddev = disk->private_data;
7047 static const struct block_device_operations md_fops =
7049 .owner = THIS_MODULE,
7051 .release = md_release,
7053 #ifdef CONFIG_COMPAT
7054 .compat_ioctl = md_compat_ioctl,
7056 .getgeo = md_getgeo,
7057 .media_changed = md_media_changed,
7058 .revalidate_disk= md_revalidate,
7061 static int md_thread(void *arg)
7063 struct md_thread *thread = arg;
7066 * md_thread is a 'system-thread', it's priority should be very
7067 * high. We avoid resource deadlocks individually in each
7068 * raid personality. (RAID5 does preallocation) We also use RR and
7069 * the very same RT priority as kswapd, thus we will never get
7070 * into a priority inversion deadlock.
7072 * we definitely have to have equal or higher priority than
7073 * bdflush, otherwise bdflush will deadlock if there are too
7074 * many dirty RAID5 blocks.
7077 allow_signal(SIGKILL);
7078 while (!kthread_should_stop()) {
7080 /* We need to wait INTERRUPTIBLE so that
7081 * we don't add to the load-average.
7082 * That means we need to be sure no signals are
7085 if (signal_pending(current))
7086 flush_signals(current);
7088 wait_event_interruptible_timeout
7090 test_bit(THREAD_WAKEUP, &thread->flags)
7091 || kthread_should_stop(),
7094 clear_bit(THREAD_WAKEUP, &thread->flags);
7095 if (!kthread_should_stop())
7096 thread->run(thread);
7102 void md_wakeup_thread(struct md_thread *thread)
7105 pr_debug("md: waking up MD thread %s.\n", thread->tsk->comm);
7106 set_bit(THREAD_WAKEUP, &thread->flags);
7107 wake_up(&thread->wqueue);
7110 EXPORT_SYMBOL(md_wakeup_thread);
7112 struct md_thread *md_register_thread(void (*run) (struct md_thread *),
7113 struct mddev *mddev, const char *name)
7115 struct md_thread *thread;
7117 thread = kzalloc(sizeof(struct md_thread), GFP_KERNEL);
7121 init_waitqueue_head(&thread->wqueue);
7124 thread->mddev = mddev;
7125 thread->timeout = MAX_SCHEDULE_TIMEOUT;
7126 thread->tsk = kthread_run(md_thread, thread,
7128 mdname(thread->mddev),
7130 if (IS_ERR(thread->tsk)) {
7136 EXPORT_SYMBOL(md_register_thread);
7138 void md_unregister_thread(struct md_thread **threadp)
7140 struct md_thread *thread = *threadp;
7143 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
7144 /* Locking ensures that mddev_unlock does not wake_up a
7145 * non-existent thread
7147 spin_lock(&pers_lock);
7149 spin_unlock(&pers_lock);
7151 kthread_stop(thread->tsk);
7154 EXPORT_SYMBOL(md_unregister_thread);
7156 void md_error(struct mddev *mddev, struct md_rdev *rdev)
7158 if (!rdev || test_bit(Faulty, &rdev->flags))
7161 if (!mddev->pers || !mddev->pers->error_handler)
7163 mddev->pers->error_handler(mddev,rdev);
7164 if (mddev->degraded)
7165 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7166 sysfs_notify_dirent_safe(rdev->sysfs_state);
7167 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7168 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7169 md_wakeup_thread(mddev->thread);
7170 if (mddev->event_work.func)
7171 queue_work(md_misc_wq, &mddev->event_work);
7172 md_new_event_inintr(mddev);
7174 EXPORT_SYMBOL(md_error);
7176 /* seq_file implementation /proc/mdstat */
7178 static void status_unused(struct seq_file *seq)
7181 struct md_rdev *rdev;
7183 seq_printf(seq, "unused devices: ");
7185 list_for_each_entry(rdev, &pending_raid_disks, same_set) {
7186 char b[BDEVNAME_SIZE];
7188 seq_printf(seq, "%s ",
7189 bdevname(rdev->bdev,b));
7192 seq_printf(seq, "<none>");
7194 seq_printf(seq, "\n");
7197 static int status_resync(struct seq_file *seq, struct mddev *mddev)
7199 sector_t max_sectors, resync, res;
7200 unsigned long dt, db;
7203 unsigned int per_milli;
7205 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
7206 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
7207 max_sectors = mddev->resync_max_sectors;
7209 max_sectors = mddev->dev_sectors;
7211 resync = mddev->curr_resync;
7213 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
7214 /* Still cleaning up */
7215 resync = max_sectors;
7217 resync -= atomic_read(&mddev->recovery_active);
7220 if (mddev->recovery_cp < MaxSector) {
7221 seq_printf(seq, "\tresync=PENDING");
7227 seq_printf(seq, "\tresync=DELAYED");
7231 WARN_ON(max_sectors == 0);
7232 /* Pick 'scale' such that (resync>>scale)*1000 will fit
7233 * in a sector_t, and (max_sectors>>scale) will fit in a
7234 * u32, as those are the requirements for sector_div.
7235 * Thus 'scale' must be at least 10
7238 if (sizeof(sector_t) > sizeof(unsigned long)) {
7239 while ( max_sectors/2 > (1ULL<<(scale+32)))
7242 res = (resync>>scale)*1000;
7243 sector_div(res, (u32)((max_sectors>>scale)+1));
7247 int i, x = per_milli/50, y = 20-x;
7248 seq_printf(seq, "[");
7249 for (i = 0; i < x; i++)
7250 seq_printf(seq, "=");
7251 seq_printf(seq, ">");
7252 for (i = 0; i < y; i++)
7253 seq_printf(seq, ".");
7254 seq_printf(seq, "] ");
7256 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
7257 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
7259 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
7261 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
7262 "resync" : "recovery"))),
7263 per_milli/10, per_milli % 10,
7264 (unsigned long long) resync/2,
7265 (unsigned long long) max_sectors/2);
7268 * dt: time from mark until now
7269 * db: blocks written from mark until now
7270 * rt: remaining time
7272 * rt is a sector_t, so could be 32bit or 64bit.
7273 * So we divide before multiply in case it is 32bit and close
7275 * We scale the divisor (db) by 32 to avoid losing precision
7276 * near the end of resync when the number of remaining sectors
7278 * We then divide rt by 32 after multiplying by db to compensate.
7279 * The '+1' avoids division by zero if db is very small.
7281 dt = ((jiffies - mddev->resync_mark) / HZ);
7283 db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active))
7284 - mddev->resync_mark_cnt;
7286 rt = max_sectors - resync; /* number of remaining sectors */
7287 sector_div(rt, db/32+1);
7291 seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60,
7292 ((unsigned long)rt % 60)/6);
7294 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
7298 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
7300 struct list_head *tmp;
7302 struct mddev *mddev;
7310 spin_lock(&all_mddevs_lock);
7311 list_for_each(tmp,&all_mddevs)
7313 mddev = list_entry(tmp, struct mddev, all_mddevs);
7315 spin_unlock(&all_mddevs_lock);
7318 spin_unlock(&all_mddevs_lock);
7320 return (void*)2;/* tail */
7324 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
7326 struct list_head *tmp;
7327 struct mddev *next_mddev, *mddev = v;
7333 spin_lock(&all_mddevs_lock);
7335 tmp = all_mddevs.next;
7337 tmp = mddev->all_mddevs.next;
7338 if (tmp != &all_mddevs)
7339 next_mddev = mddev_get(list_entry(tmp,struct mddev,all_mddevs));
7341 next_mddev = (void*)2;
7344 spin_unlock(&all_mddevs_lock);
7352 static void md_seq_stop(struct seq_file *seq, void *v)
7354 struct mddev *mddev = v;
7356 if (mddev && v != (void*)1 && v != (void*)2)
7360 static int md_seq_show(struct seq_file *seq, void *v)
7362 struct mddev *mddev = v;
7364 struct md_rdev *rdev;
7366 if (v == (void*)1) {
7367 struct md_personality *pers;
7368 seq_printf(seq, "Personalities : ");
7369 spin_lock(&pers_lock);
7370 list_for_each_entry(pers, &pers_list, list)
7371 seq_printf(seq, "[%s] ", pers->name);
7373 spin_unlock(&pers_lock);
7374 seq_printf(seq, "\n");
7375 seq->poll_event = atomic_read(&md_event_count);
7378 if (v == (void*)2) {
7383 spin_lock(&mddev->lock);
7384 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
7385 seq_printf(seq, "%s : %sactive", mdname(mddev),
7386 mddev->pers ? "" : "in");
7389 seq_printf(seq, " (read-only)");
7391 seq_printf(seq, " (auto-read-only)");
7392 seq_printf(seq, " %s", mddev->pers->name);
7397 rdev_for_each_rcu(rdev, mddev) {
7398 char b[BDEVNAME_SIZE];
7399 seq_printf(seq, " %s[%d]",
7400 bdevname(rdev->bdev,b), rdev->desc_nr);
7401 if (test_bit(WriteMostly, &rdev->flags))
7402 seq_printf(seq, "(W)");
7403 if (test_bit(Journal, &rdev->flags))
7404 seq_printf(seq, "(J)");
7405 if (test_bit(Faulty, &rdev->flags)) {
7406 seq_printf(seq, "(F)");
7409 if (rdev->raid_disk < 0)
7410 seq_printf(seq, "(S)"); /* spare */
7411 if (test_bit(Replacement, &rdev->flags))
7412 seq_printf(seq, "(R)");
7413 sectors += rdev->sectors;
7417 if (!list_empty(&mddev->disks)) {
7419 seq_printf(seq, "\n %llu blocks",
7420 (unsigned long long)
7421 mddev->array_sectors / 2);
7423 seq_printf(seq, "\n %llu blocks",
7424 (unsigned long long)sectors / 2);
7426 if (mddev->persistent) {
7427 if (mddev->major_version != 0 ||
7428 mddev->minor_version != 90) {
7429 seq_printf(seq," super %d.%d",
7430 mddev->major_version,
7431 mddev->minor_version);
7433 } else if (mddev->external)
7434 seq_printf(seq, " super external:%s",
7435 mddev->metadata_type);
7437 seq_printf(seq, " super non-persistent");
7440 mddev->pers->status(seq, mddev);
7441 seq_printf(seq, "\n ");
7442 if (mddev->pers->sync_request) {
7443 if (status_resync(seq, mddev))
7444 seq_printf(seq, "\n ");
7447 seq_printf(seq, "\n ");
7449 bitmap_status(seq, mddev->bitmap);
7451 seq_printf(seq, "\n");
7453 spin_unlock(&mddev->lock);
7458 static const struct seq_operations md_seq_ops = {
7459 .start = md_seq_start,
7460 .next = md_seq_next,
7461 .stop = md_seq_stop,
7462 .show = md_seq_show,
7465 static int md_seq_open(struct inode *inode, struct file *file)
7467 struct seq_file *seq;
7470 error = seq_open(file, &md_seq_ops);
7474 seq = file->private_data;
7475 seq->poll_event = atomic_read(&md_event_count);
7479 static int md_unloading;
7480 static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
7482 struct seq_file *seq = filp->private_data;
7486 return POLLIN|POLLRDNORM|POLLERR|POLLPRI;
7487 poll_wait(filp, &md_event_waiters, wait);
7489 /* always allow read */
7490 mask = POLLIN | POLLRDNORM;
7492 if (seq->poll_event != atomic_read(&md_event_count))
7493 mask |= POLLERR | POLLPRI;
7497 static const struct file_operations md_seq_fops = {
7498 .owner = THIS_MODULE,
7499 .open = md_seq_open,
7501 .llseek = seq_lseek,
7502 .release = seq_release_private,
7503 .poll = mdstat_poll,
7506 int register_md_personality(struct md_personality *p)
7508 printk(KERN_INFO "md: %s personality registered for level %d\n",
7510 spin_lock(&pers_lock);
7511 list_add_tail(&p->list, &pers_list);
7512 spin_unlock(&pers_lock);
7515 EXPORT_SYMBOL(register_md_personality);
7517 int unregister_md_personality(struct md_personality *p)
7519 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
7520 spin_lock(&pers_lock);
7521 list_del_init(&p->list);
7522 spin_unlock(&pers_lock);
7525 EXPORT_SYMBOL(unregister_md_personality);
7527 int register_md_cluster_operations(struct md_cluster_operations *ops,
7528 struct module *module)
7531 spin_lock(&pers_lock);
7532 if (md_cluster_ops != NULL)
7535 md_cluster_ops = ops;
7536 md_cluster_mod = module;
7538 spin_unlock(&pers_lock);
7541 EXPORT_SYMBOL(register_md_cluster_operations);
7543 int unregister_md_cluster_operations(void)
7545 spin_lock(&pers_lock);
7546 md_cluster_ops = NULL;
7547 spin_unlock(&pers_lock);
7550 EXPORT_SYMBOL(unregister_md_cluster_operations);
7552 int md_setup_cluster(struct mddev *mddev, int nodes)
7556 err = request_module("md-cluster");
7558 pr_err("md-cluster module not found.\n");
7562 spin_lock(&pers_lock);
7563 if (!md_cluster_ops || !try_module_get(md_cluster_mod)) {
7564 spin_unlock(&pers_lock);
7567 spin_unlock(&pers_lock);
7569 return md_cluster_ops->join(mddev, nodes);
7572 void md_cluster_stop(struct mddev *mddev)
7574 if (!md_cluster_ops)
7576 md_cluster_ops->leave(mddev);
7577 module_put(md_cluster_mod);
7580 static int is_mddev_idle(struct mddev *mddev, int init)
7582 struct md_rdev *rdev;
7588 rdev_for_each_rcu(rdev, mddev) {
7589 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
7590 curr_events = (int)part_stat_read(&disk->part0, sectors[0]) +
7591 (int)part_stat_read(&disk->part0, sectors[1]) -
7592 atomic_read(&disk->sync_io);
7593 /* sync IO will cause sync_io to increase before the disk_stats
7594 * as sync_io is counted when a request starts, and
7595 * disk_stats is counted when it completes.
7596 * So resync activity will cause curr_events to be smaller than
7597 * when there was no such activity.
7598 * non-sync IO will cause disk_stat to increase without
7599 * increasing sync_io so curr_events will (eventually)
7600 * be larger than it was before. Once it becomes
7601 * substantially larger, the test below will cause
7602 * the array to appear non-idle, and resync will slow
7604 * If there is a lot of outstanding resync activity when
7605 * we set last_event to curr_events, then all that activity
7606 * completing might cause the array to appear non-idle
7607 * and resync will be slowed down even though there might
7608 * not have been non-resync activity. This will only
7609 * happen once though. 'last_events' will soon reflect
7610 * the state where there is little or no outstanding
7611 * resync requests, and further resync activity will
7612 * always make curr_events less than last_events.
7615 if (init || curr_events - rdev->last_events > 64) {
7616 rdev->last_events = curr_events;
7624 void md_done_sync(struct mddev *mddev, int blocks, int ok)
7626 /* another "blocks" (512byte) blocks have been synced */
7627 atomic_sub(blocks, &mddev->recovery_active);
7628 wake_up(&mddev->recovery_wait);
7630 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7631 set_bit(MD_RECOVERY_ERROR, &mddev->recovery);
7632 md_wakeup_thread(mddev->thread);
7633 // stop recovery, signal do_sync ....
7636 EXPORT_SYMBOL(md_done_sync);
7638 /* md_write_start(mddev, bi)
7639 * If we need to update some array metadata (e.g. 'active' flag
7640 * in superblock) before writing, schedule a superblock update
7641 * and wait for it to complete.
7643 void md_write_start(struct mddev *mddev, struct bio *bi)
7646 if (bio_data_dir(bi) != WRITE)
7649 BUG_ON(mddev->ro == 1);
7650 if (mddev->ro == 2) {
7651 /* need to switch to read/write */
7653 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7654 md_wakeup_thread(mddev->thread);
7655 md_wakeup_thread(mddev->sync_thread);
7658 atomic_inc(&mddev->writes_pending);
7659 if (mddev->safemode == 1)
7660 mddev->safemode = 0;
7661 if (mddev->in_sync) {
7662 spin_lock(&mddev->lock);
7663 if (mddev->in_sync) {
7665 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
7666 set_bit(MD_CHANGE_PENDING, &mddev->flags);
7667 md_wakeup_thread(mddev->thread);
7670 spin_unlock(&mddev->lock);
7673 sysfs_notify_dirent_safe(mddev->sysfs_state);
7674 wait_event(mddev->sb_wait,
7675 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
7677 EXPORT_SYMBOL(md_write_start);
7679 void md_write_end(struct mddev *mddev)
7681 if (atomic_dec_and_test(&mddev->writes_pending)) {
7682 if (mddev->safemode == 2)
7683 md_wakeup_thread(mddev->thread);
7684 else if (mddev->safemode_delay)
7685 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
7688 EXPORT_SYMBOL(md_write_end);
7690 /* md_allow_write(mddev)
7691 * Calling this ensures that the array is marked 'active' so that writes
7692 * may proceed without blocking. It is important to call this before
7693 * attempting a GFP_KERNEL allocation while holding the mddev lock.
7694 * Must be called with mddev_lock held.
7696 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
7697 * is dropped, so return -EAGAIN after notifying userspace.
7699 int md_allow_write(struct mddev *mddev)
7705 if (!mddev->pers->sync_request)
7708 spin_lock(&mddev->lock);
7709 if (mddev->in_sync) {
7711 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
7712 set_bit(MD_CHANGE_PENDING, &mddev->flags);
7713 if (mddev->safemode_delay &&
7714 mddev->safemode == 0)
7715 mddev->safemode = 1;
7716 spin_unlock(&mddev->lock);
7717 md_update_sb(mddev, 0);
7718 sysfs_notify_dirent_safe(mddev->sysfs_state);
7720 spin_unlock(&mddev->lock);
7722 if (test_bit(MD_CHANGE_PENDING, &mddev->flags))
7727 EXPORT_SYMBOL_GPL(md_allow_write);
7729 #define SYNC_MARKS 10
7730 #define SYNC_MARK_STEP (3*HZ)
7731 #define UPDATE_FREQUENCY (5*60*HZ)
7732 void md_do_sync(struct md_thread *thread)
7734 struct mddev *mddev = thread->mddev;
7735 struct mddev *mddev2;
7736 unsigned int currspeed = 0,
7738 sector_t max_sectors,j, io_sectors, recovery_done;
7739 unsigned long mark[SYNC_MARKS];
7740 unsigned long update_time;
7741 sector_t mark_cnt[SYNC_MARKS];
7743 struct list_head *tmp;
7744 sector_t last_check;
7746 struct md_rdev *rdev;
7747 char *desc, *action = NULL;
7748 struct blk_plug plug;
7749 bool cluster_resync_finished = false;
7751 /* just incase thread restarts... */
7752 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
7754 if (mddev->ro) {/* never try to sync a read-only array */
7755 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7759 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
7760 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) {
7761 desc = "data-check";
7763 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
7764 desc = "requested-resync";
7768 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
7773 mddev->last_sync_action = action ?: desc;
7775 /* we overload curr_resync somewhat here.
7776 * 0 == not engaged in resync at all
7777 * 2 == checking that there is no conflict with another sync
7778 * 1 == like 2, but have yielded to allow conflicting resync to
7780 * other == active in resync - this many blocks
7782 * Before starting a resync we must have set curr_resync to
7783 * 2, and then checked that every "conflicting" array has curr_resync
7784 * less than ours. When we find one that is the same or higher
7785 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
7786 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
7787 * This will mean we have to start checking from the beginning again.
7792 mddev->curr_resync = 2;
7795 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
7797 for_each_mddev(mddev2, tmp) {
7798 if (mddev2 == mddev)
7800 if (!mddev->parallel_resync
7801 && mddev2->curr_resync
7802 && match_mddev_units(mddev, mddev2)) {
7804 if (mddev < mddev2 && mddev->curr_resync == 2) {
7805 /* arbitrarily yield */
7806 mddev->curr_resync = 1;
7807 wake_up(&resync_wait);
7809 if (mddev > mddev2 && mddev->curr_resync == 1)
7810 /* no need to wait here, we can wait the next
7811 * time 'round when curr_resync == 2
7814 /* We need to wait 'interruptible' so as not to
7815 * contribute to the load average, and not to
7816 * be caught by 'softlockup'
7818 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
7819 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
7820 mddev2->curr_resync >= mddev->curr_resync) {
7821 printk(KERN_INFO "md: delaying %s of %s"
7822 " until %s has finished (they"
7823 " share one or more physical units)\n",
7824 desc, mdname(mddev), mdname(mddev2));
7826 if (signal_pending(current))
7827 flush_signals(current);
7829 finish_wait(&resync_wait, &wq);
7832 finish_wait(&resync_wait, &wq);
7835 } while (mddev->curr_resync < 2);
7838 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
7839 /* resync follows the size requested by the personality,
7840 * which defaults to physical size, but can be virtual size
7842 max_sectors = mddev->resync_max_sectors;
7843 atomic64_set(&mddev->resync_mismatches, 0);
7844 /* we don't use the checkpoint if there's a bitmap */
7845 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
7846 j = mddev->resync_min;
7847 else if (!mddev->bitmap)
7848 j = mddev->recovery_cp;
7850 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
7851 max_sectors = mddev->resync_max_sectors;
7853 /* recovery follows the physical size of devices */
7854 max_sectors = mddev->dev_sectors;
7857 rdev_for_each_rcu(rdev, mddev)
7858 if (rdev->raid_disk >= 0 &&
7859 !test_bit(Journal, &rdev->flags) &&
7860 !test_bit(Faulty, &rdev->flags) &&
7861 !test_bit(In_sync, &rdev->flags) &&
7862 rdev->recovery_offset < j)
7863 j = rdev->recovery_offset;
7866 /* If there is a bitmap, we need to make sure all
7867 * writes that started before we added a spare
7868 * complete before we start doing a recovery.
7869 * Otherwise the write might complete and (via
7870 * bitmap_endwrite) set a bit in the bitmap after the
7871 * recovery has checked that bit and skipped that
7874 if (mddev->bitmap) {
7875 mddev->pers->quiesce(mddev, 1);
7876 mddev->pers->quiesce(mddev, 0);
7880 printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev));
7881 printk(KERN_INFO "md: minimum _guaranteed_ speed:"
7882 " %d KB/sec/disk.\n", speed_min(mddev));
7883 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
7884 "(but not more than %d KB/sec) for %s.\n",
7885 speed_max(mddev), desc);
7887 is_mddev_idle(mddev, 1); /* this initializes IO event counters */
7890 for (m = 0; m < SYNC_MARKS; m++) {
7892 mark_cnt[m] = io_sectors;
7895 mddev->resync_mark = mark[last_mark];
7896 mddev->resync_mark_cnt = mark_cnt[last_mark];
7899 * Tune reconstruction:
7901 window = 32*(PAGE_SIZE/512);
7902 printk(KERN_INFO "md: using %dk window, over a total of %lluk.\n",
7903 window/2, (unsigned long long)max_sectors/2);
7905 atomic_set(&mddev->recovery_active, 0);
7910 "md: resuming %s of %s from checkpoint.\n",
7911 desc, mdname(mddev));
7912 mddev->curr_resync = j;
7914 mddev->curr_resync = 3; /* no longer delayed */
7915 mddev->curr_resync_completed = j;
7916 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
7917 md_new_event(mddev);
7918 update_time = jiffies;
7920 blk_start_plug(&plug);
7921 while (j < max_sectors) {
7926 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
7927 ((mddev->curr_resync > mddev->curr_resync_completed &&
7928 (mddev->curr_resync - mddev->curr_resync_completed)
7929 > (max_sectors >> 4)) ||
7930 time_after_eq(jiffies, update_time + UPDATE_FREQUENCY) ||
7931 (j - mddev->curr_resync_completed)*2
7932 >= mddev->resync_max - mddev->curr_resync_completed ||
7933 mddev->curr_resync_completed > mddev->resync_max
7935 /* time to update curr_resync_completed */
7936 wait_event(mddev->recovery_wait,
7937 atomic_read(&mddev->recovery_active) == 0);
7938 mddev->curr_resync_completed = j;
7939 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) &&
7940 j > mddev->recovery_cp)
7941 mddev->recovery_cp = j;
7942 update_time = jiffies;
7943 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
7944 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
7947 while (j >= mddev->resync_max &&
7948 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
7949 /* As this condition is controlled by user-space,
7950 * we can block indefinitely, so use '_interruptible'
7951 * to avoid triggering warnings.
7953 flush_signals(current); /* just in case */
7954 wait_event_interruptible(mddev->recovery_wait,
7955 mddev->resync_max > j
7956 || test_bit(MD_RECOVERY_INTR,
7960 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
7963 sectors = mddev->pers->sync_request(mddev, j, &skipped);
7965 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7969 if (!skipped) { /* actual IO requested */
7970 io_sectors += sectors;
7971 atomic_add(sectors, &mddev->recovery_active);
7974 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
7978 if (j > max_sectors)
7979 /* when skipping, extra large numbers can be returned. */
7982 mddev->curr_resync = j;
7983 mddev->curr_mark_cnt = io_sectors;
7984 if (last_check == 0)
7985 /* this is the earliest that rebuild will be
7986 * visible in /proc/mdstat
7988 md_new_event(mddev);
7990 if (last_check + window > io_sectors || j == max_sectors)
7993 last_check = io_sectors;
7995 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
7997 int next = (last_mark+1) % SYNC_MARKS;
7999 mddev->resync_mark = mark[next];
8000 mddev->resync_mark_cnt = mark_cnt[next];
8001 mark[next] = jiffies;
8002 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
8006 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8010 * this loop exits only if either when we are slower than
8011 * the 'hard' speed limit, or the system was IO-idle for
8013 * the system might be non-idle CPU-wise, but we only care
8014 * about not overloading the IO subsystem. (things like an
8015 * e2fsck being done on the RAID array should execute fast)
8019 recovery_done = io_sectors - atomic_read(&mddev->recovery_active);
8020 currspeed = ((unsigned long)(recovery_done - mddev->resync_mark_cnt))/2
8021 /((jiffies-mddev->resync_mark)/HZ +1) +1;
8023 if (currspeed > speed_min(mddev)) {
8024 if (currspeed > speed_max(mddev)) {
8028 if (!is_mddev_idle(mddev, 0)) {
8030 * Give other IO more of a chance.
8031 * The faster the devices, the less we wait.
8033 wait_event(mddev->recovery_wait,
8034 !atomic_read(&mddev->recovery_active));
8038 printk(KERN_INFO "md: %s: %s %s.\n",mdname(mddev), desc,
8039 test_bit(MD_RECOVERY_INTR, &mddev->recovery)
8040 ? "interrupted" : "done");
8042 * this also signals 'finished resyncing' to md_stop
8044 blk_finish_plug(&plug);
8045 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
8047 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8048 !test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8049 mddev->curr_resync > 2) {
8050 mddev->curr_resync_completed = mddev->curr_resync;
8051 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
8053 /* tell personality and other nodes that we are finished */
8054 if (mddev_is_clustered(mddev)) {
8055 md_cluster_ops->resync_finish(mddev);
8056 cluster_resync_finished = true;
8058 mddev->pers->sync_request(mddev, max_sectors, &skipped);
8060 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
8061 mddev->curr_resync > 2) {
8062 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
8063 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
8064 if (mddev->curr_resync >= mddev->recovery_cp) {
8066 "md: checkpointing %s of %s.\n",
8067 desc, mdname(mddev));
8068 if (test_bit(MD_RECOVERY_ERROR,
8070 mddev->recovery_cp =
8071 mddev->curr_resync_completed;
8073 mddev->recovery_cp =
8077 mddev->recovery_cp = MaxSector;
8079 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8080 mddev->curr_resync = MaxSector;
8082 rdev_for_each_rcu(rdev, mddev)
8083 if (rdev->raid_disk >= 0 &&
8084 mddev->delta_disks >= 0 &&
8085 !test_bit(Journal, &rdev->flags) &&
8086 !test_bit(Faulty, &rdev->flags) &&
8087 !test_bit(In_sync, &rdev->flags) &&
8088 rdev->recovery_offset < mddev->curr_resync)
8089 rdev->recovery_offset = mddev->curr_resync;
8094 set_bit(MD_CHANGE_DEVS, &mddev->flags);
8096 if (mddev_is_clustered(mddev) &&
8097 test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8098 !cluster_resync_finished)
8099 md_cluster_ops->resync_finish(mddev);
8101 spin_lock(&mddev->lock);
8102 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
8103 /* We completed so min/max setting can be forgotten if used. */
8104 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
8105 mddev->resync_min = 0;
8106 mddev->resync_max = MaxSector;
8107 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
8108 mddev->resync_min = mddev->curr_resync_completed;
8109 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
8110 mddev->curr_resync = 0;
8111 spin_unlock(&mddev->lock);
8113 wake_up(&resync_wait);
8114 md_wakeup_thread(mddev->thread);
8117 EXPORT_SYMBOL_GPL(md_do_sync);
8119 static int remove_and_add_spares(struct mddev *mddev,
8120 struct md_rdev *this)
8122 struct md_rdev *rdev;
8126 rdev_for_each(rdev, mddev)
8127 if ((this == NULL || rdev == this) &&
8128 rdev->raid_disk >= 0 &&
8129 !test_bit(Blocked, &rdev->flags) &&
8130 (test_bit(Faulty, &rdev->flags) ||
8131 (!test_bit(In_sync, &rdev->flags) &&
8132 !test_bit(Journal, &rdev->flags))) &&
8133 atomic_read(&rdev->nr_pending)==0) {
8134 if (mddev->pers->hot_remove_disk(
8135 mddev, rdev) == 0) {
8136 sysfs_unlink_rdev(mddev, rdev);
8137 rdev->raid_disk = -1;
8141 if (removed && mddev->kobj.sd)
8142 sysfs_notify(&mddev->kobj, NULL, "degraded");
8144 if (this && removed)
8147 rdev_for_each(rdev, mddev) {
8148 if (this && this != rdev)
8150 if (test_bit(Candidate, &rdev->flags))
8152 if (rdev->raid_disk >= 0 &&
8153 !test_bit(In_sync, &rdev->flags) &&
8154 !test_bit(Journal, &rdev->flags) &&
8155 !test_bit(Faulty, &rdev->flags))
8157 if (rdev->raid_disk >= 0)
8159 if (test_bit(Faulty, &rdev->flags))
8161 if (test_bit(Journal, &rdev->flags))
8164 ! (rdev->saved_raid_disk >= 0 &&
8165 !test_bit(Bitmap_sync, &rdev->flags)))
8168 rdev->recovery_offset = 0;
8170 hot_add_disk(mddev, rdev) == 0) {
8171 if (sysfs_link_rdev(mddev, rdev))
8172 /* failure here is OK */;
8174 md_new_event(mddev);
8175 set_bit(MD_CHANGE_DEVS, &mddev->flags);
8180 set_bit(MD_CHANGE_DEVS, &mddev->flags);
8184 static void md_start_sync(struct work_struct *ws)
8186 struct mddev *mddev = container_of(ws, struct mddev, del_work);
8189 if (mddev_is_clustered(mddev)) {
8190 ret = md_cluster_ops->resync_start(mddev);
8192 mddev->sync_thread = NULL;
8197 mddev->sync_thread = md_register_thread(md_do_sync,
8201 if (!mddev->sync_thread) {
8202 if (!(mddev_is_clustered(mddev) && ret == -EAGAIN))
8203 printk(KERN_ERR "%s: could not start resync"
8206 /* leave the spares where they are, it shouldn't hurt */
8207 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8208 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
8209 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
8210 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
8211 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
8212 wake_up(&resync_wait);
8213 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
8215 if (mddev->sysfs_action)
8216 sysfs_notify_dirent_safe(mddev->sysfs_action);
8218 md_wakeup_thread(mddev->sync_thread);
8219 sysfs_notify_dirent_safe(mddev->sysfs_action);
8220 md_new_event(mddev);
8224 * This routine is regularly called by all per-raid-array threads to
8225 * deal with generic issues like resync and super-block update.
8226 * Raid personalities that don't have a thread (linear/raid0) do not
8227 * need this as they never do any recovery or update the superblock.
8229 * It does not do any resync itself, but rather "forks" off other threads
8230 * to do that as needed.
8231 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
8232 * "->recovery" and create a thread at ->sync_thread.
8233 * When the thread finishes it sets MD_RECOVERY_DONE
8234 * and wakeups up this thread which will reap the thread and finish up.
8235 * This thread also removes any faulty devices (with nr_pending == 0).
8237 * The overall approach is:
8238 * 1/ if the superblock needs updating, update it.
8239 * 2/ If a recovery thread is running, don't do anything else.
8240 * 3/ If recovery has finished, clean up, possibly marking spares active.
8241 * 4/ If there are any faulty devices, remove them.
8242 * 5/ If array is degraded, try to add spares devices
8243 * 6/ If array has spares or is not in-sync, start a resync thread.
8245 void md_check_recovery(struct mddev *mddev)
8247 if (mddev->suspended)
8251 bitmap_daemon_work(mddev);
8253 if (signal_pending(current)) {
8254 if (mddev->pers->sync_request && !mddev->external) {
8255 printk(KERN_INFO "md: %s in immediate safe mode\n",
8257 mddev->safemode = 2;
8259 flush_signals(current);
8262 if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
8265 (mddev->flags & MD_UPDATE_SB_FLAGS & ~ (1<<MD_CHANGE_PENDING)) ||
8266 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
8267 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
8268 (mddev->external == 0 && mddev->safemode == 1) ||
8269 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
8270 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
8274 if (mddev_trylock(mddev)) {
8278 struct md_rdev *rdev;
8279 if (!mddev->external && mddev->in_sync)
8280 /* 'Blocked' flag not needed as failed devices
8281 * will be recorded if array switched to read/write.
8282 * Leaving it set will prevent the device
8283 * from being removed.
8285 rdev_for_each(rdev, mddev)
8286 clear_bit(Blocked, &rdev->flags);
8287 /* On a read-only array we can:
8288 * - remove failed devices
8289 * - add already-in_sync devices if the array itself
8291 * As we only add devices that are already in-sync,
8292 * we can activate the spares immediately.
8294 remove_and_add_spares(mddev, NULL);
8295 /* There is no thread, but we need to call
8296 * ->spare_active and clear saved_raid_disk
8298 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8299 md_reap_sync_thread(mddev);
8300 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8301 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8302 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
8306 if (!mddev->external) {
8308 spin_lock(&mddev->lock);
8309 if (mddev->safemode &&
8310 !atomic_read(&mddev->writes_pending) &&
8312 mddev->recovery_cp == MaxSector) {
8315 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
8317 if (mddev->safemode == 1)
8318 mddev->safemode = 0;
8319 spin_unlock(&mddev->lock);
8321 sysfs_notify_dirent_safe(mddev->sysfs_state);
8324 if (mddev->flags & MD_UPDATE_SB_FLAGS)
8325 md_update_sb(mddev, 0);
8327 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
8328 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
8329 /* resync/recovery still happening */
8330 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8333 if (mddev->sync_thread) {
8334 md_reap_sync_thread(mddev);
8337 /* Set RUNNING before clearing NEEDED to avoid
8338 * any transients in the value of "sync_action".
8340 mddev->curr_resync_completed = 0;
8341 spin_lock(&mddev->lock);
8342 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
8343 spin_unlock(&mddev->lock);
8344 /* Clear some bits that don't mean anything, but
8347 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
8348 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
8350 if (!test_and_clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
8351 test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
8353 /* no recovery is running.
8354 * remove any failed drives, then
8355 * add spares if possible.
8356 * Spares are also removed and re-added, to allow
8357 * the personality to fail the re-add.
8360 if (mddev->reshape_position != MaxSector) {
8361 if (mddev->pers->check_reshape == NULL ||
8362 mddev->pers->check_reshape(mddev) != 0)
8363 /* Cannot proceed */
8365 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
8366 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8367 } else if ((spares = remove_and_add_spares(mddev, NULL))) {
8368 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8369 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
8370 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
8371 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8372 } else if (mddev->recovery_cp < MaxSector) {
8373 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8374 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8375 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
8376 /* nothing to be done ... */
8379 if (mddev->pers->sync_request) {
8381 /* We are adding a device or devices to an array
8382 * which has the bitmap stored on all devices.
8383 * So make sure all bitmap pages get written
8385 bitmap_write_all(mddev->bitmap);
8387 INIT_WORK(&mddev->del_work, md_start_sync);
8388 queue_work(md_misc_wq, &mddev->del_work);
8392 if (!mddev->sync_thread) {
8393 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
8394 wake_up(&resync_wait);
8395 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
8397 if (mddev->sysfs_action)
8398 sysfs_notify_dirent_safe(mddev->sysfs_action);
8401 wake_up(&mddev->sb_wait);
8402 mddev_unlock(mddev);
8405 EXPORT_SYMBOL(md_check_recovery);
8407 void md_reap_sync_thread(struct mddev *mddev)
8409 struct md_rdev *rdev;
8411 /* resync has finished, collect result */
8412 md_unregister_thread(&mddev->sync_thread);
8413 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8414 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
8416 /* activate any spares */
8417 if (mddev->pers->spare_active(mddev)) {
8418 sysfs_notify(&mddev->kobj, NULL,
8420 set_bit(MD_CHANGE_DEVS, &mddev->flags);
8423 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8424 mddev->pers->finish_reshape)
8425 mddev->pers->finish_reshape(mddev);
8427 /* If array is no-longer degraded, then any saved_raid_disk
8428 * information must be scrapped.
8430 if (!mddev->degraded)
8431 rdev_for_each(rdev, mddev)
8432 rdev->saved_raid_disk = -1;
8434 md_update_sb(mddev, 1);
8435 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
8436 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
8437 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8438 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
8439 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
8440 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
8441 wake_up(&resync_wait);
8442 /* flag recovery needed just to double check */
8443 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8444 sysfs_notify_dirent_safe(mddev->sysfs_action);
8445 md_new_event(mddev);
8446 if (mddev->event_work.func)
8447 queue_work(md_misc_wq, &mddev->event_work);
8449 EXPORT_SYMBOL(md_reap_sync_thread);
8451 void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev)
8453 sysfs_notify_dirent_safe(rdev->sysfs_state);
8454 wait_event_timeout(rdev->blocked_wait,
8455 !test_bit(Blocked, &rdev->flags) &&
8456 !test_bit(BlockedBadBlocks, &rdev->flags),
8457 msecs_to_jiffies(5000));
8458 rdev_dec_pending(rdev, mddev);
8460 EXPORT_SYMBOL(md_wait_for_blocked_rdev);
8462 void md_finish_reshape(struct mddev *mddev)
8464 /* called be personality module when reshape completes. */
8465 struct md_rdev *rdev;
8467 rdev_for_each(rdev, mddev) {
8468 if (rdev->data_offset > rdev->new_data_offset)
8469 rdev->sectors += rdev->data_offset - rdev->new_data_offset;
8471 rdev->sectors -= rdev->new_data_offset - rdev->data_offset;
8472 rdev->data_offset = rdev->new_data_offset;
8475 EXPORT_SYMBOL(md_finish_reshape);
8477 /* Bad block management */
8479 /* Returns 1 on success, 0 on failure */
8480 int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
8485 s += rdev->new_data_offset;
8487 s += rdev->data_offset;
8488 rv = badblocks_set(&rdev->badblocks, s, sectors, 0);
8490 /* Make sure they get written out promptly */
8491 sysfs_notify_dirent_safe(rdev->sysfs_state);
8492 set_bit(MD_CHANGE_CLEAN, &rdev->mddev->flags);
8493 set_bit(MD_CHANGE_PENDING, &rdev->mddev->flags);
8494 md_wakeup_thread(rdev->mddev->thread);
8499 EXPORT_SYMBOL_GPL(rdev_set_badblocks);
8501 int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
8505 s += rdev->new_data_offset;
8507 s += rdev->data_offset;
8508 return badblocks_clear(&rdev->badblocks,
8511 EXPORT_SYMBOL_GPL(rdev_clear_badblocks);
8513 static int md_notify_reboot(struct notifier_block *this,
8514 unsigned long code, void *x)
8516 struct list_head *tmp;
8517 struct mddev *mddev;
8520 for_each_mddev(mddev, tmp) {
8521 if (mddev_trylock(mddev)) {
8523 __md_stop_writes(mddev);
8524 if (mddev->persistent)
8525 mddev->safemode = 2;
8526 mddev_unlock(mddev);
8531 * certain more exotic SCSI devices are known to be
8532 * volatile wrt too early system reboots. While the
8533 * right place to handle this issue is the given
8534 * driver, we do want to have a safe RAID driver ...
8542 static struct notifier_block md_notifier = {
8543 .notifier_call = md_notify_reboot,
8545 .priority = INT_MAX, /* before any real devices */
8548 static void md_geninit(void)
8550 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
8552 proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops);
8555 static int __init md_init(void)
8559 md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0);
8563 md_misc_wq = alloc_workqueue("md_misc", 0, 0);
8567 if ((ret = register_blkdev(MD_MAJOR, "md")) < 0)
8570 if ((ret = register_blkdev(0, "mdp")) < 0)
8574 blk_register_region(MKDEV(MD_MAJOR, 0), 512, THIS_MODULE,
8575 md_probe, NULL, NULL);
8576 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
8577 md_probe, NULL, NULL);
8579 register_reboot_notifier(&md_notifier);
8580 raid_table_header = register_sysctl_table(raid_root_table);
8586 unregister_blkdev(MD_MAJOR, "md");
8588 destroy_workqueue(md_misc_wq);
8590 destroy_workqueue(md_wq);
8595 static void check_sb_changes(struct mddev *mddev, struct md_rdev *rdev)
8597 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
8598 struct md_rdev *rdev2;
8600 char b[BDEVNAME_SIZE];
8602 /* Check for change of roles in the active devices */
8603 rdev_for_each(rdev2, mddev) {
8604 if (test_bit(Faulty, &rdev2->flags))
8607 /* Check if the roles changed */
8608 role = le16_to_cpu(sb->dev_roles[rdev2->desc_nr]);
8610 if (test_bit(Candidate, &rdev2->flags)) {
8611 if (role == 0xfffe) {
8612 pr_info("md: Removing Candidate device %s because add failed\n", bdevname(rdev2->bdev,b));
8613 md_kick_rdev_from_array(rdev2);
8617 clear_bit(Candidate, &rdev2->flags);
8620 if (role != rdev2->raid_disk) {
8622 if (rdev2->raid_disk == -1 && role != 0xffff) {
8623 rdev2->saved_raid_disk = role;
8624 ret = remove_and_add_spares(mddev, rdev2);
8625 pr_info("Activated spare: %s\n",
8626 bdevname(rdev2->bdev,b));
8630 * We just want to do the minimum to mark the disk
8631 * as faulty. The recovery is performed by the
8632 * one who initiated the error.
8634 if ((role == 0xfffe) || (role == 0xfffd)) {
8635 md_error(mddev, rdev2);
8636 clear_bit(Blocked, &rdev2->flags);
8641 if (mddev->raid_disks != le32_to_cpu(sb->raid_disks))
8642 update_raid_disks(mddev, le32_to_cpu(sb->raid_disks));
8644 /* Finally set the event to be up to date */
8645 mddev->events = le64_to_cpu(sb->events);
8648 static int read_rdev(struct mddev *mddev, struct md_rdev *rdev)
8651 struct page *swapout = rdev->sb_page;
8652 struct mdp_superblock_1 *sb;
8654 /* Store the sb page of the rdev in the swapout temporary
8655 * variable in case we err in the future
8657 rdev->sb_page = NULL;
8658 alloc_disk_sb(rdev);
8659 ClearPageUptodate(rdev->sb_page);
8660 rdev->sb_loaded = 0;
8661 err = super_types[mddev->major_version].load_super(rdev, NULL, mddev->minor_version);
8664 pr_warn("%s: %d Could not reload rdev(%d) err: %d. Restoring old values\n",
8665 __func__, __LINE__, rdev->desc_nr, err);
8666 put_page(rdev->sb_page);
8667 rdev->sb_page = swapout;
8668 rdev->sb_loaded = 1;
8672 sb = page_address(rdev->sb_page);
8673 /* Read the offset unconditionally, even if MD_FEATURE_RECOVERY_OFFSET
8677 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RECOVERY_OFFSET))
8678 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
8680 /* The other node finished recovery, call spare_active to set
8681 * device In_sync and mddev->degraded
8683 if (rdev->recovery_offset == MaxSector &&
8684 !test_bit(In_sync, &rdev->flags) &&
8685 mddev->pers->spare_active(mddev))
8686 sysfs_notify(&mddev->kobj, NULL, "degraded");
8692 void md_reload_sb(struct mddev *mddev, int nr)
8694 struct md_rdev *rdev;
8698 rdev_for_each_rcu(rdev, mddev) {
8699 if (rdev->desc_nr == nr)
8703 if (!rdev || rdev->desc_nr != nr) {
8704 pr_warn("%s: %d Could not find rdev with nr %d\n", __func__, __LINE__, nr);
8708 err = read_rdev(mddev, rdev);
8712 check_sb_changes(mddev, rdev);
8714 /* Read all rdev's to update recovery_offset */
8715 rdev_for_each_rcu(rdev, mddev)
8716 read_rdev(mddev, rdev);
8718 EXPORT_SYMBOL(md_reload_sb);
8723 * Searches all registered partitions for autorun RAID arrays
8727 static LIST_HEAD(all_detected_devices);
8728 struct detected_devices_node {
8729 struct list_head list;
8733 void md_autodetect_dev(dev_t dev)
8735 struct detected_devices_node *node_detected_dev;
8737 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
8738 if (node_detected_dev) {
8739 node_detected_dev->dev = dev;
8740 list_add_tail(&node_detected_dev->list, &all_detected_devices);
8742 printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed"
8743 ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev));
8747 static void autostart_arrays(int part)
8749 struct md_rdev *rdev;
8750 struct detected_devices_node *node_detected_dev;
8752 int i_scanned, i_passed;
8757 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
8759 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
8761 node_detected_dev = list_entry(all_detected_devices.next,
8762 struct detected_devices_node, list);
8763 list_del(&node_detected_dev->list);
8764 dev = node_detected_dev->dev;
8765 kfree(node_detected_dev);
8766 rdev = md_import_device(dev,0, 90);
8770 if (test_bit(Faulty, &rdev->flags))
8773 set_bit(AutoDetected, &rdev->flags);
8774 list_add(&rdev->same_set, &pending_raid_disks);
8778 printk(KERN_INFO "md: Scanned %d and added %d devices.\n",
8779 i_scanned, i_passed);
8781 autorun_devices(part);
8784 #endif /* !MODULE */
8786 static __exit void md_exit(void)
8788 struct mddev *mddev;
8789 struct list_head *tmp;
8792 blk_unregister_region(MKDEV(MD_MAJOR,0), 512);
8793 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
8795 unregister_blkdev(MD_MAJOR,"md");
8796 unregister_blkdev(mdp_major, "mdp");
8797 unregister_reboot_notifier(&md_notifier);
8798 unregister_sysctl_table(raid_table_header);
8800 /* We cannot unload the modules while some process is
8801 * waiting for us in select() or poll() - wake them up
8804 while (waitqueue_active(&md_event_waiters)) {
8805 /* not safe to leave yet */
8806 wake_up(&md_event_waiters);
8810 remove_proc_entry("mdstat", NULL);
8812 for_each_mddev(mddev, tmp) {
8813 export_array(mddev);
8814 mddev->hold_active = 0;
8816 destroy_workqueue(md_misc_wq);
8817 destroy_workqueue(md_wq);
8820 subsys_initcall(md_init);
8821 module_exit(md_exit)
8823 static int get_ro(char *buffer, struct kernel_param *kp)
8825 return sprintf(buffer, "%d", start_readonly);
8827 static int set_ro(const char *val, struct kernel_param *kp)
8829 return kstrtouint(val, 10, (unsigned int *)&start_readonly);
8832 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
8833 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
8834 module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR);
8836 MODULE_LICENSE("GPL");
8837 MODULE_DESCRIPTION("MD RAID framework");
8839 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);