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);
210 * Enables to iterate over all existing md arrays
211 * all_mddevs_lock protects this list.
213 static LIST_HEAD(all_mddevs);
214 static DEFINE_SPINLOCK(all_mddevs_lock);
217 * iterates through all used mddevs in the system.
218 * We take care to grab the all_mddevs_lock whenever navigating
219 * the list, and to always hold a refcount when unlocked.
220 * Any code which breaks out of this loop while own
221 * a reference to the current mddev and must mddev_put it.
223 #define for_each_mddev(_mddev,_tmp) \
225 for (({ spin_lock(&all_mddevs_lock); \
226 _tmp = all_mddevs.next; \
228 ({ if (_tmp != &all_mddevs) \
229 mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\
230 spin_unlock(&all_mddevs_lock); \
231 if (_mddev) mddev_put(_mddev); \
232 _mddev = list_entry(_tmp, struct mddev, all_mddevs); \
233 _tmp != &all_mddevs;}); \
234 ({ spin_lock(&all_mddevs_lock); \
235 _tmp = _tmp->next;}) \
238 /* Rather than calling directly into the personality make_request function,
239 * IO requests come here first so that we can check if the device is
240 * being suspended pending a reconfiguration.
241 * We hold a refcount over the call to ->make_request. By the time that
242 * call has finished, the bio has been linked into some internal structure
243 * and so is visible to ->quiesce(), so we don't need the refcount any more.
245 static blk_qc_t md_make_request(struct request_queue *q, struct bio *bio)
247 const int rw = bio_data_dir(bio);
248 struct mddev *mddev = q->queuedata;
249 unsigned int sectors;
252 blk_queue_split(q, &bio, q->bio_split);
254 if (mddev == NULL || mddev->pers == NULL) {
256 return BLK_QC_T_NONE;
258 if (mddev->ro == 1 && unlikely(rw == WRITE)) {
259 if (bio_sectors(bio) != 0)
260 bio->bi_error = -EROFS;
262 return BLK_QC_T_NONE;
264 smp_rmb(); /* Ensure implications of 'active' are visible */
266 if (mddev->suspended) {
269 prepare_to_wait(&mddev->sb_wait, &__wait,
270 TASK_UNINTERRUPTIBLE);
271 if (!mddev->suspended)
277 finish_wait(&mddev->sb_wait, &__wait);
279 atomic_inc(&mddev->active_io);
283 * save the sectors now since our bio can
284 * go away inside make_request
286 sectors = bio_sectors(bio);
287 /* bio could be mergeable after passing to underlayer */
288 bio->bi_opf &= ~REQ_NOMERGE;
289 mddev->pers->make_request(mddev, bio);
291 cpu = part_stat_lock();
292 part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]);
293 part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw], sectors);
296 if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended)
297 wake_up(&mddev->sb_wait);
299 return BLK_QC_T_NONE;
302 /* mddev_suspend makes sure no new requests are submitted
303 * to the device, and that any requests that have been submitted
304 * are completely handled.
305 * Once mddev_detach() is called and completes, the module will be
308 void mddev_suspend(struct mddev *mddev)
310 WARN_ON_ONCE(mddev->thread && current == mddev->thread->tsk);
311 if (mddev->suspended++)
314 wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0);
315 mddev->pers->quiesce(mddev, 1);
317 del_timer_sync(&mddev->safemode_timer);
319 EXPORT_SYMBOL_GPL(mddev_suspend);
321 void mddev_resume(struct mddev *mddev)
323 if (--mddev->suspended)
325 wake_up(&mddev->sb_wait);
326 mddev->pers->quiesce(mddev, 0);
328 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
329 md_wakeup_thread(mddev->thread);
330 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
332 EXPORT_SYMBOL_GPL(mddev_resume);
334 int mddev_congested(struct mddev *mddev, int bits)
336 struct md_personality *pers = mddev->pers;
340 if (mddev->suspended)
342 else if (pers && pers->congested)
343 ret = pers->congested(mddev, bits);
347 EXPORT_SYMBOL_GPL(mddev_congested);
348 static int md_congested(void *data, int bits)
350 struct mddev *mddev = data;
351 return mddev_congested(mddev, bits);
355 * Generic flush handling for md
358 static void md_end_flush(struct bio *bio)
360 struct md_rdev *rdev = bio->bi_private;
361 struct mddev *mddev = rdev->mddev;
365 rdev_dec_pending(rdev, mddev);
367 if (atomic_dec_and_test(&mddev->flush_pending)) {
368 /* The pre-request flush has finished */
369 queue_work(md_wq, &mddev->flush_work);
373 static void md_submit_flush_data(struct work_struct *ws);
375 static void submit_flushes(struct work_struct *ws)
377 struct mddev *mddev = container_of(ws, struct mddev, flush_work);
378 struct md_rdev *rdev;
380 INIT_WORK(&mddev->flush_work, md_submit_flush_data);
381 atomic_set(&mddev->flush_pending, 1);
383 rdev_for_each_rcu(rdev, mddev)
384 if (rdev->raid_disk >= 0 &&
385 !test_bit(Faulty, &rdev->flags)) {
386 /* Take two references, one is dropped
387 * when request finishes, one after
388 * we reclaim rcu_read_lock
391 atomic_inc(&rdev->nr_pending);
392 atomic_inc(&rdev->nr_pending);
394 bi = bio_alloc_mddev(GFP_NOIO, 0, mddev);
395 bi->bi_end_io = md_end_flush;
396 bi->bi_private = rdev;
397 bi->bi_bdev = rdev->bdev;
398 bio_set_op_attrs(bi, REQ_OP_WRITE, WRITE_FLUSH);
399 atomic_inc(&mddev->flush_pending);
402 rdev_dec_pending(rdev, mddev);
405 if (atomic_dec_and_test(&mddev->flush_pending))
406 queue_work(md_wq, &mddev->flush_work);
409 static void md_submit_flush_data(struct work_struct *ws)
411 struct mddev *mddev = container_of(ws, struct mddev, flush_work);
412 struct bio *bio = mddev->flush_bio;
414 if (bio->bi_iter.bi_size == 0)
415 /* an empty barrier - all done */
418 bio->bi_opf &= ~REQ_PREFLUSH;
419 mddev->pers->make_request(mddev, bio);
422 mddev->flush_bio = NULL;
423 wake_up(&mddev->sb_wait);
426 void md_flush_request(struct mddev *mddev, struct bio *bio)
428 spin_lock_irq(&mddev->lock);
429 wait_event_lock_irq(mddev->sb_wait,
432 mddev->flush_bio = bio;
433 spin_unlock_irq(&mddev->lock);
435 INIT_WORK(&mddev->flush_work, submit_flushes);
436 queue_work(md_wq, &mddev->flush_work);
438 EXPORT_SYMBOL(md_flush_request);
440 void md_unplug(struct blk_plug_cb *cb, bool from_schedule)
442 struct mddev *mddev = cb->data;
443 md_wakeup_thread(mddev->thread);
446 EXPORT_SYMBOL(md_unplug);
448 static inline struct mddev *mddev_get(struct mddev *mddev)
450 atomic_inc(&mddev->active);
454 static void mddev_delayed_delete(struct work_struct *ws);
456 static void mddev_put(struct mddev *mddev)
458 struct bio_set *bs = NULL;
460 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
462 if (!mddev->raid_disks && list_empty(&mddev->disks) &&
463 mddev->ctime == 0 && !mddev->hold_active) {
464 /* Array is not configured at all, and not held active,
466 list_del_init(&mddev->all_mddevs);
468 mddev->bio_set = NULL;
469 if (mddev->gendisk) {
470 /* We did a probe so need to clean up. Call
471 * queue_work inside the spinlock so that
472 * flush_workqueue() after mddev_find will
473 * succeed in waiting for the work to be done.
475 INIT_WORK(&mddev->del_work, mddev_delayed_delete);
476 queue_work(md_misc_wq, &mddev->del_work);
480 spin_unlock(&all_mddevs_lock);
485 static void md_safemode_timeout(unsigned long data);
487 void mddev_init(struct mddev *mddev)
489 mutex_init(&mddev->open_mutex);
490 mutex_init(&mddev->reconfig_mutex);
491 mutex_init(&mddev->bitmap_info.mutex);
492 INIT_LIST_HEAD(&mddev->disks);
493 INIT_LIST_HEAD(&mddev->all_mddevs);
494 setup_timer(&mddev->safemode_timer, md_safemode_timeout,
495 (unsigned long) mddev);
496 atomic_set(&mddev->active, 1);
497 atomic_set(&mddev->openers, 0);
498 atomic_set(&mddev->active_io, 0);
499 spin_lock_init(&mddev->lock);
500 atomic_set(&mddev->flush_pending, 0);
501 init_waitqueue_head(&mddev->sb_wait);
502 init_waitqueue_head(&mddev->recovery_wait);
503 mddev->reshape_position = MaxSector;
504 mddev->reshape_backwards = 0;
505 mddev->last_sync_action = "none";
506 mddev->resync_min = 0;
507 mddev->resync_max = MaxSector;
508 mddev->level = LEVEL_NONE;
510 EXPORT_SYMBOL_GPL(mddev_init);
512 static struct mddev *mddev_find_locked(dev_t unit)
516 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
517 if (mddev->unit == unit)
523 static struct mddev *mddev_find(dev_t unit)
525 struct mddev *mddev, *new = NULL;
527 if (unit && MAJOR(unit) != MD_MAJOR)
528 unit &= ~((1<<MdpMinorShift)-1);
531 spin_lock(&all_mddevs_lock);
534 mddev = mddev_find_locked(unit);
537 spin_unlock(&all_mddevs_lock);
543 list_add(&new->all_mddevs, &all_mddevs);
544 spin_unlock(&all_mddevs_lock);
545 new->hold_active = UNTIL_IOCTL;
549 /* find an unused unit number */
550 static int next_minor = 512;
551 int start = next_minor;
555 dev = MKDEV(MD_MAJOR, next_minor);
557 if (next_minor > MINORMASK)
559 if (next_minor == start) {
560 /* Oh dear, all in use. */
561 spin_unlock(&all_mddevs_lock);
566 is_free = !mddev_find_locked(dev);
569 new->md_minor = MINOR(dev);
570 new->hold_active = UNTIL_STOP;
571 list_add(&new->all_mddevs, &all_mddevs);
572 spin_unlock(&all_mddevs_lock);
575 spin_unlock(&all_mddevs_lock);
577 new = kzalloc(sizeof(*new), GFP_KERNEL);
582 if (MAJOR(unit) == MD_MAJOR)
583 new->md_minor = MINOR(unit);
585 new->md_minor = MINOR(unit) >> MdpMinorShift;
592 static struct attribute_group md_redundancy_group;
594 void mddev_unlock(struct mddev *mddev)
596 if (mddev->to_remove) {
597 /* These cannot be removed under reconfig_mutex as
598 * an access to the files will try to take reconfig_mutex
599 * while holding the file unremovable, which leads to
601 * So hold set sysfs_active while the remove in happeing,
602 * and anything else which might set ->to_remove or my
603 * otherwise change the sysfs namespace will fail with
604 * -EBUSY if sysfs_active is still set.
605 * We set sysfs_active under reconfig_mutex and elsewhere
606 * test it under the same mutex to ensure its correct value
609 struct attribute_group *to_remove = mddev->to_remove;
610 mddev->to_remove = NULL;
611 mddev->sysfs_active = 1;
612 mutex_unlock(&mddev->reconfig_mutex);
614 if (mddev->kobj.sd) {
615 if (to_remove != &md_redundancy_group)
616 sysfs_remove_group(&mddev->kobj, to_remove);
617 if (mddev->pers == NULL ||
618 mddev->pers->sync_request == NULL) {
619 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
620 if (mddev->sysfs_action)
621 sysfs_put(mddev->sysfs_action);
622 mddev->sysfs_action = NULL;
625 mddev->sysfs_active = 0;
627 mutex_unlock(&mddev->reconfig_mutex);
629 /* As we've dropped the mutex we need a spinlock to
630 * make sure the thread doesn't disappear
632 spin_lock(&pers_lock);
633 md_wakeup_thread(mddev->thread);
634 spin_unlock(&pers_lock);
636 EXPORT_SYMBOL_GPL(mddev_unlock);
638 struct md_rdev *md_find_rdev_nr_rcu(struct mddev *mddev, int nr)
640 struct md_rdev *rdev;
642 rdev_for_each_rcu(rdev, mddev)
643 if (rdev->desc_nr == nr)
648 EXPORT_SYMBOL_GPL(md_find_rdev_nr_rcu);
650 static struct md_rdev *find_rdev(struct mddev *mddev, dev_t dev)
652 struct md_rdev *rdev;
654 rdev_for_each(rdev, mddev)
655 if (rdev->bdev->bd_dev == dev)
661 static struct md_rdev *find_rdev_rcu(struct mddev *mddev, dev_t dev)
663 struct md_rdev *rdev;
665 rdev_for_each_rcu(rdev, mddev)
666 if (rdev->bdev->bd_dev == dev)
672 static struct md_personality *find_pers(int level, char *clevel)
674 struct md_personality *pers;
675 list_for_each_entry(pers, &pers_list, list) {
676 if (level != LEVEL_NONE && pers->level == level)
678 if (strcmp(pers->name, clevel)==0)
684 /* return the offset of the super block in 512byte sectors */
685 static inline sector_t calc_dev_sboffset(struct md_rdev *rdev)
687 sector_t num_sectors = i_size_read(rdev->bdev->bd_inode) / 512;
688 return MD_NEW_SIZE_SECTORS(num_sectors);
691 static int alloc_disk_sb(struct md_rdev *rdev)
693 rdev->sb_page = alloc_page(GFP_KERNEL);
694 if (!rdev->sb_page) {
695 printk(KERN_ALERT "md: out of memory.\n");
702 void md_rdev_clear(struct md_rdev *rdev)
705 put_page(rdev->sb_page);
707 rdev->sb_page = NULL;
712 put_page(rdev->bb_page);
713 rdev->bb_page = NULL;
715 badblocks_exit(&rdev->badblocks);
717 EXPORT_SYMBOL_GPL(md_rdev_clear);
719 static void super_written(struct bio *bio)
721 struct md_rdev *rdev = bio->bi_private;
722 struct mddev *mddev = rdev->mddev;
725 printk("md: super_written gets error=%d\n", bio->bi_error);
726 md_error(mddev, rdev);
731 rdev_dec_pending(rdev, mddev);
733 if (atomic_dec_and_test(&mddev->pending_writes))
734 wake_up(&mddev->sb_wait);
737 void md_super_write(struct mddev *mddev, struct md_rdev *rdev,
738 sector_t sector, int size, struct page *page)
740 /* write first size bytes of page to sector of rdev
741 * Increment mddev->pending_writes before returning
742 * and decrement it on completion, waking up sb_wait
743 * if zero is reached.
744 * If an error occurred, call md_error
746 struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, mddev);
748 atomic_inc(&rdev->nr_pending);
750 bio->bi_bdev = rdev->meta_bdev ? rdev->meta_bdev : rdev->bdev;
751 bio->bi_iter.bi_sector = sector;
752 bio_add_page(bio, page, size, 0);
753 bio->bi_private = rdev;
754 bio->bi_end_io = super_written;
755 bio_set_op_attrs(bio, REQ_OP_WRITE, WRITE_FLUSH_FUA);
757 atomic_inc(&mddev->pending_writes);
761 void md_super_wait(struct mddev *mddev)
763 /* wait for all superblock writes that were scheduled to complete */
764 wait_event(mddev->sb_wait, atomic_read(&mddev->pending_writes)==0);
767 int sync_page_io(struct md_rdev *rdev, sector_t sector, int size,
768 struct page *page, int op, int op_flags, bool metadata_op)
770 struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, rdev->mddev);
773 bio->bi_bdev = (metadata_op && rdev->meta_bdev) ?
774 rdev->meta_bdev : rdev->bdev;
775 bio_set_op_attrs(bio, op, op_flags);
777 bio->bi_iter.bi_sector = sector + rdev->sb_start;
778 else if (rdev->mddev->reshape_position != MaxSector &&
779 (rdev->mddev->reshape_backwards ==
780 (sector >= rdev->mddev->reshape_position)))
781 bio->bi_iter.bi_sector = sector + rdev->new_data_offset;
783 bio->bi_iter.bi_sector = sector + rdev->data_offset;
784 bio_add_page(bio, page, size, 0);
786 submit_bio_wait(bio);
788 ret = !bio->bi_error;
792 EXPORT_SYMBOL_GPL(sync_page_io);
794 static int read_disk_sb(struct md_rdev *rdev, int size)
796 char b[BDEVNAME_SIZE];
801 if (!sync_page_io(rdev, 0, size, rdev->sb_page, REQ_OP_READ, 0, true))
807 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
808 bdevname(rdev->bdev,b));
812 static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
814 return sb1->set_uuid0 == sb2->set_uuid0 &&
815 sb1->set_uuid1 == sb2->set_uuid1 &&
816 sb1->set_uuid2 == sb2->set_uuid2 &&
817 sb1->set_uuid3 == sb2->set_uuid3;
820 static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
823 mdp_super_t *tmp1, *tmp2;
825 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
826 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
828 if (!tmp1 || !tmp2) {
830 printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n");
838 * nr_disks is not constant
843 ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0);
850 static u32 md_csum_fold(u32 csum)
852 csum = (csum & 0xffff) + (csum >> 16);
853 return (csum & 0xffff) + (csum >> 16);
856 static unsigned int calc_sb_csum(mdp_super_t *sb)
859 u32 *sb32 = (u32*)sb;
861 unsigned int disk_csum, csum;
863 disk_csum = sb->sb_csum;
866 for (i = 0; i < MD_SB_BYTES/4 ; i++)
868 csum = (newcsum & 0xffffffff) + (newcsum>>32);
871 /* This used to use csum_partial, which was wrong for several
872 * reasons including that different results are returned on
873 * different architectures. It isn't critical that we get exactly
874 * the same return value as before (we always csum_fold before
875 * testing, and that removes any differences). However as we
876 * know that csum_partial always returned a 16bit value on
877 * alphas, do a fold to maximise conformity to previous behaviour.
879 sb->sb_csum = md_csum_fold(disk_csum);
881 sb->sb_csum = disk_csum;
887 * Handle superblock details.
888 * We want to be able to handle multiple superblock formats
889 * so we have a common interface to them all, and an array of
890 * different handlers.
891 * We rely on user-space to write the initial superblock, and support
892 * reading and updating of superblocks.
893 * Interface methods are:
894 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version)
895 * loads and validates a superblock on dev.
896 * if refdev != NULL, compare superblocks on both devices
898 * 0 - dev has a superblock that is compatible with refdev
899 * 1 - dev has a superblock that is compatible and newer than refdev
900 * so dev should be used as the refdev in future
901 * -EINVAL superblock incompatible or invalid
902 * -othererror e.g. -EIO
904 * int validate_super(struct mddev *mddev, struct md_rdev *dev)
905 * Verify that dev is acceptable into mddev.
906 * The first time, mddev->raid_disks will be 0, and data from
907 * dev should be merged in. Subsequent calls check that dev
908 * is new enough. Return 0 or -EINVAL
910 * void sync_super(struct mddev *mddev, struct md_rdev *dev)
911 * Update the superblock for rdev with data in mddev
912 * This does not write to disc.
918 struct module *owner;
919 int (*load_super)(struct md_rdev *rdev,
920 struct md_rdev *refdev,
922 int (*validate_super)(struct mddev *mddev,
923 struct md_rdev *rdev);
924 void (*sync_super)(struct mddev *mddev,
925 struct md_rdev *rdev);
926 unsigned long long (*rdev_size_change)(struct md_rdev *rdev,
927 sector_t num_sectors);
928 int (*allow_new_offset)(struct md_rdev *rdev,
929 unsigned long long new_offset);
933 * Check that the given mddev has no bitmap.
935 * This function is called from the run method of all personalities that do not
936 * support bitmaps. It prints an error message and returns non-zero if mddev
937 * has a bitmap. Otherwise, it returns 0.
940 int md_check_no_bitmap(struct mddev *mddev)
942 if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset)
944 printk(KERN_ERR "%s: bitmaps are not supported for %s\n",
945 mdname(mddev), mddev->pers->name);
948 EXPORT_SYMBOL(md_check_no_bitmap);
951 * load_super for 0.90.0
953 static int super_90_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
955 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
960 * Calculate the position of the superblock (512byte sectors),
961 * it's at the end of the disk.
963 * It also happens to be a multiple of 4Kb.
965 rdev->sb_start = calc_dev_sboffset(rdev);
967 ret = read_disk_sb(rdev, MD_SB_BYTES);
972 bdevname(rdev->bdev, b);
973 sb = page_address(rdev->sb_page);
975 if (sb->md_magic != MD_SB_MAGIC) {
976 printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
981 if (sb->major_version != 0 ||
982 sb->minor_version < 90 ||
983 sb->minor_version > 91) {
984 printk(KERN_WARNING "Bad version number %d.%d on %s\n",
985 sb->major_version, sb->minor_version,
990 if (sb->raid_disks <= 0)
993 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
994 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
999 rdev->preferred_minor = sb->md_minor;
1000 rdev->data_offset = 0;
1001 rdev->new_data_offset = 0;
1002 rdev->sb_size = MD_SB_BYTES;
1003 rdev->badblocks.shift = -1;
1005 if (sb->level == LEVEL_MULTIPATH)
1008 rdev->desc_nr = sb->this_disk.number;
1014 mdp_super_t *refsb = page_address(refdev->sb_page);
1015 if (!uuid_equal(refsb, sb)) {
1016 printk(KERN_WARNING "md: %s has different UUID to %s\n",
1017 b, bdevname(refdev->bdev,b2));
1020 if (!sb_equal(refsb, sb)) {
1021 printk(KERN_WARNING "md: %s has same UUID"
1022 " but different superblock to %s\n",
1023 b, bdevname(refdev->bdev, b2));
1027 ev2 = md_event(refsb);
1033 rdev->sectors = rdev->sb_start;
1034 /* Limit to 4TB as metadata cannot record more than that.
1035 * (not needed for Linear and RAID0 as metadata doesn't
1038 if (IS_ENABLED(CONFIG_LBDAF) && (u64)rdev->sectors >= (2ULL << 32) &&
1040 rdev->sectors = (sector_t)(2ULL << 32) - 2;
1042 if (rdev->sectors < ((sector_t)sb->size) * 2 && sb->level >= 1)
1043 /* "this cannot possibly happen" ... */
1051 * validate_super for 0.90.0
1053 static int super_90_validate(struct mddev *mddev, struct md_rdev *rdev)
1056 mdp_super_t *sb = page_address(rdev->sb_page);
1057 __u64 ev1 = md_event(sb);
1059 rdev->raid_disk = -1;
1060 clear_bit(Faulty, &rdev->flags);
1061 clear_bit(In_sync, &rdev->flags);
1062 clear_bit(Bitmap_sync, &rdev->flags);
1063 clear_bit(WriteMostly, &rdev->flags);
1065 if (mddev->raid_disks == 0) {
1066 mddev->major_version = 0;
1067 mddev->minor_version = sb->minor_version;
1068 mddev->patch_version = sb->patch_version;
1069 mddev->external = 0;
1070 mddev->chunk_sectors = sb->chunk_size >> 9;
1071 mddev->ctime = sb->ctime;
1072 mddev->utime = sb->utime;
1073 mddev->level = sb->level;
1074 mddev->clevel[0] = 0;
1075 mddev->layout = sb->layout;
1076 mddev->raid_disks = sb->raid_disks;
1077 mddev->dev_sectors = ((sector_t)sb->size) * 2;
1078 mddev->events = ev1;
1079 mddev->bitmap_info.offset = 0;
1080 mddev->bitmap_info.space = 0;
1081 /* bitmap can use 60 K after the 4K superblocks */
1082 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
1083 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
1084 mddev->reshape_backwards = 0;
1086 if (mddev->minor_version >= 91) {
1087 mddev->reshape_position = sb->reshape_position;
1088 mddev->delta_disks = sb->delta_disks;
1089 mddev->new_level = sb->new_level;
1090 mddev->new_layout = sb->new_layout;
1091 mddev->new_chunk_sectors = sb->new_chunk >> 9;
1092 if (mddev->delta_disks < 0)
1093 mddev->reshape_backwards = 1;
1095 mddev->reshape_position = MaxSector;
1096 mddev->delta_disks = 0;
1097 mddev->new_level = mddev->level;
1098 mddev->new_layout = mddev->layout;
1099 mddev->new_chunk_sectors = mddev->chunk_sectors;
1102 if (sb->state & (1<<MD_SB_CLEAN))
1103 mddev->recovery_cp = MaxSector;
1105 if (sb->events_hi == sb->cp_events_hi &&
1106 sb->events_lo == sb->cp_events_lo) {
1107 mddev->recovery_cp = sb->recovery_cp;
1109 mddev->recovery_cp = 0;
1112 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
1113 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
1114 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
1115 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
1117 mddev->max_disks = MD_SB_DISKS;
1119 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
1120 mddev->bitmap_info.file == NULL) {
1121 mddev->bitmap_info.offset =
1122 mddev->bitmap_info.default_offset;
1123 mddev->bitmap_info.space =
1124 mddev->bitmap_info.default_space;
1127 } else if (mddev->pers == NULL) {
1128 /* Insist on good event counter while assembling, except
1129 * for spares (which don't need an event count) */
1131 if (sb->disks[rdev->desc_nr].state & (
1132 (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE)))
1133 if (ev1 < mddev->events)
1135 } else if (mddev->bitmap) {
1136 /* if adding to array with a bitmap, then we can accept an
1137 * older device ... but not too old.
1139 if (ev1 < mddev->bitmap->events_cleared)
1141 if (ev1 < mddev->events)
1142 set_bit(Bitmap_sync, &rdev->flags);
1144 if (ev1 < mddev->events)
1145 /* just a hot-add of a new device, leave raid_disk at -1 */
1149 if (mddev->level != LEVEL_MULTIPATH) {
1150 desc = sb->disks + rdev->desc_nr;
1152 if (desc->state & (1<<MD_DISK_FAULTY))
1153 set_bit(Faulty, &rdev->flags);
1154 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
1155 desc->raid_disk < mddev->raid_disks */) {
1156 set_bit(In_sync, &rdev->flags);
1157 rdev->raid_disk = desc->raid_disk;
1158 rdev->saved_raid_disk = desc->raid_disk;
1159 } else if (desc->state & (1<<MD_DISK_ACTIVE)) {
1160 /* active but not in sync implies recovery up to
1161 * reshape position. We don't know exactly where
1162 * that is, so set to zero for now */
1163 if (mddev->minor_version >= 91) {
1164 rdev->recovery_offset = 0;
1165 rdev->raid_disk = desc->raid_disk;
1168 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
1169 set_bit(WriteMostly, &rdev->flags);
1170 } else /* MULTIPATH are always insync */
1171 set_bit(In_sync, &rdev->flags);
1176 * sync_super for 0.90.0
1178 static void super_90_sync(struct mddev *mddev, struct md_rdev *rdev)
1181 struct md_rdev *rdev2;
1182 int next_spare = mddev->raid_disks;
1184 /* make rdev->sb match mddev data..
1187 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1188 * 3/ any empty disks < next_spare become removed
1190 * disks[0] gets initialised to REMOVED because
1191 * we cannot be sure from other fields if it has
1192 * been initialised or not.
1195 int active=0, working=0,failed=0,spare=0,nr_disks=0;
1197 rdev->sb_size = MD_SB_BYTES;
1199 sb = page_address(rdev->sb_page);
1201 memset(sb, 0, sizeof(*sb));
1203 sb->md_magic = MD_SB_MAGIC;
1204 sb->major_version = mddev->major_version;
1205 sb->patch_version = mddev->patch_version;
1206 sb->gvalid_words = 0; /* ignored */
1207 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
1208 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
1209 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
1210 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
1212 sb->ctime = clamp_t(time64_t, mddev->ctime, 0, U32_MAX);
1213 sb->level = mddev->level;
1214 sb->size = mddev->dev_sectors / 2;
1215 sb->raid_disks = mddev->raid_disks;
1216 sb->md_minor = mddev->md_minor;
1217 sb->not_persistent = 0;
1218 sb->utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX);
1220 sb->events_hi = (mddev->events>>32);
1221 sb->events_lo = (u32)mddev->events;
1223 if (mddev->reshape_position == MaxSector)
1224 sb->minor_version = 90;
1226 sb->minor_version = 91;
1227 sb->reshape_position = mddev->reshape_position;
1228 sb->new_level = mddev->new_level;
1229 sb->delta_disks = mddev->delta_disks;
1230 sb->new_layout = mddev->new_layout;
1231 sb->new_chunk = mddev->new_chunk_sectors << 9;
1233 mddev->minor_version = sb->minor_version;
1236 sb->recovery_cp = mddev->recovery_cp;
1237 sb->cp_events_hi = (mddev->events>>32);
1238 sb->cp_events_lo = (u32)mddev->events;
1239 if (mddev->recovery_cp == MaxSector)
1240 sb->state = (1<< MD_SB_CLEAN);
1242 sb->recovery_cp = 0;
1244 sb->layout = mddev->layout;
1245 sb->chunk_size = mddev->chunk_sectors << 9;
1247 if (mddev->bitmap && mddev->bitmap_info.file == NULL)
1248 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
1250 sb->disks[0].state = (1<<MD_DISK_REMOVED);
1251 rdev_for_each(rdev2, mddev) {
1254 int is_active = test_bit(In_sync, &rdev2->flags);
1256 if (rdev2->raid_disk >= 0 &&
1257 sb->minor_version >= 91)
1258 /* we have nowhere to store the recovery_offset,
1259 * but if it is not below the reshape_position,
1260 * we can piggy-back on that.
1263 if (rdev2->raid_disk < 0 ||
1264 test_bit(Faulty, &rdev2->flags))
1267 desc_nr = rdev2->raid_disk;
1269 desc_nr = next_spare++;
1270 rdev2->desc_nr = desc_nr;
1271 d = &sb->disks[rdev2->desc_nr];
1273 d->number = rdev2->desc_nr;
1274 d->major = MAJOR(rdev2->bdev->bd_dev);
1275 d->minor = MINOR(rdev2->bdev->bd_dev);
1277 d->raid_disk = rdev2->raid_disk;
1279 d->raid_disk = rdev2->desc_nr; /* compatibility */
1280 if (test_bit(Faulty, &rdev2->flags))
1281 d->state = (1<<MD_DISK_FAULTY);
1282 else if (is_active) {
1283 d->state = (1<<MD_DISK_ACTIVE);
1284 if (test_bit(In_sync, &rdev2->flags))
1285 d->state |= (1<<MD_DISK_SYNC);
1293 if (test_bit(WriteMostly, &rdev2->flags))
1294 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1296 /* now set the "removed" and "faulty" bits on any missing devices */
1297 for (i=0 ; i < mddev->raid_disks ; i++) {
1298 mdp_disk_t *d = &sb->disks[i];
1299 if (d->state == 0 && d->number == 0) {
1302 d->state = (1<<MD_DISK_REMOVED);
1303 d->state |= (1<<MD_DISK_FAULTY);
1307 sb->nr_disks = nr_disks;
1308 sb->active_disks = active;
1309 sb->working_disks = working;
1310 sb->failed_disks = failed;
1311 sb->spare_disks = spare;
1313 sb->this_disk = sb->disks[rdev->desc_nr];
1314 sb->sb_csum = calc_sb_csum(sb);
1318 * rdev_size_change for 0.90.0
1320 static unsigned long long
1321 super_90_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
1323 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1324 return 0; /* component must fit device */
1325 if (rdev->mddev->bitmap_info.offset)
1326 return 0; /* can't move bitmap */
1327 rdev->sb_start = calc_dev_sboffset(rdev);
1328 if (!num_sectors || num_sectors > rdev->sb_start)
1329 num_sectors = rdev->sb_start;
1330 /* Limit to 4TB as metadata cannot record more than that.
1331 * 4TB == 2^32 KB, or 2*2^32 sectors.
1333 if (IS_ENABLED(CONFIG_LBDAF) && (u64)num_sectors >= (2ULL << 32) &&
1334 rdev->mddev->level >= 1)
1335 num_sectors = (sector_t)(2ULL << 32) - 2;
1336 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1338 md_super_wait(rdev->mddev);
1343 super_90_allow_new_offset(struct md_rdev *rdev, unsigned long long new_offset)
1345 /* non-zero offset changes not possible with v0.90 */
1346 return new_offset == 0;
1350 * version 1 superblock
1353 static __le32 calc_sb_1_csum(struct mdp_superblock_1 *sb)
1357 unsigned long long newcsum;
1358 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1359 __le32 *isuper = (__le32*)sb;
1361 disk_csum = sb->sb_csum;
1364 for (; size >= 4; size -= 4)
1365 newcsum += le32_to_cpu(*isuper++);
1368 newcsum += le16_to_cpu(*(__le16*) isuper);
1370 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1371 sb->sb_csum = disk_csum;
1372 return cpu_to_le32(csum);
1375 static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
1377 struct mdp_superblock_1 *sb;
1381 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1385 * Calculate the position of the superblock in 512byte sectors.
1386 * It is always aligned to a 4K boundary and
1387 * depeding on minor_version, it can be:
1388 * 0: At least 8K, but less than 12K, from end of device
1389 * 1: At start of device
1390 * 2: 4K from start of device.
1392 switch(minor_version) {
1394 sb_start = i_size_read(rdev->bdev->bd_inode) >> 9;
1396 sb_start &= ~(sector_t)(4*2-1);
1407 rdev->sb_start = sb_start;
1409 /* superblock is rarely larger than 1K, but it can be larger,
1410 * and it is safe to read 4k, so we do that
1412 ret = read_disk_sb(rdev, 4096);
1413 if (ret) return ret;
1415 sb = page_address(rdev->sb_page);
1417 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1418 sb->major_version != cpu_to_le32(1) ||
1419 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1420 le64_to_cpu(sb->super_offset) != rdev->sb_start ||
1421 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1424 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1425 printk("md: invalid superblock checksum on %s\n",
1426 bdevname(rdev->bdev,b));
1429 if (le64_to_cpu(sb->data_size) < 10) {
1430 printk("md: data_size too small on %s\n",
1431 bdevname(rdev->bdev,b));
1436 memcmp(sb->pad3, sb->pad3+1, sizeof(sb->pad3) - sizeof(sb->pad3[1])))
1437 /* Some padding is non-zero, might be a new feature */
1440 rdev->preferred_minor = 0xffff;
1441 rdev->data_offset = le64_to_cpu(sb->data_offset);
1442 rdev->new_data_offset = rdev->data_offset;
1443 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE) &&
1444 (le32_to_cpu(sb->feature_map) & MD_FEATURE_NEW_OFFSET))
1445 rdev->new_data_offset += (s32)le32_to_cpu(sb->new_offset);
1446 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1448 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1449 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1450 if (rdev->sb_size & bmask)
1451 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1454 && rdev->data_offset < sb_start + (rdev->sb_size/512))
1457 && rdev->new_data_offset < sb_start + (rdev->sb_size/512))
1460 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1463 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1465 if (!rdev->bb_page) {
1466 rdev->bb_page = alloc_page(GFP_KERNEL);
1470 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BAD_BLOCKS) &&
1471 rdev->badblocks.count == 0) {
1472 /* need to load the bad block list.
1473 * Currently we limit it to one page.
1479 int sectors = le16_to_cpu(sb->bblog_size);
1480 if (sectors > (PAGE_SIZE / 512))
1482 offset = le32_to_cpu(sb->bblog_offset);
1485 bb_sector = (long long)offset;
1486 if (!sync_page_io(rdev, bb_sector, sectors << 9,
1487 rdev->bb_page, REQ_OP_READ, 0, true))
1489 bbp = (u64 *)page_address(rdev->bb_page);
1490 rdev->badblocks.shift = sb->bblog_shift;
1491 for (i = 0 ; i < (sectors << (9-3)) ; i++, bbp++) {
1492 u64 bb = le64_to_cpu(*bbp);
1493 int count = bb & (0x3ff);
1494 u64 sector = bb >> 10;
1495 sector <<= sb->bblog_shift;
1496 count <<= sb->bblog_shift;
1499 if (badblocks_set(&rdev->badblocks, sector, count, 1))
1502 } else if (sb->bblog_offset != 0)
1503 rdev->badblocks.shift = 0;
1509 struct mdp_superblock_1 *refsb = page_address(refdev->sb_page);
1511 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1512 sb->level != refsb->level ||
1513 sb->layout != refsb->layout ||
1514 sb->chunksize != refsb->chunksize) {
1515 printk(KERN_WARNING "md: %s has strangely different"
1516 " superblock to %s\n",
1517 bdevname(rdev->bdev,b),
1518 bdevname(refdev->bdev,b2));
1521 ev1 = le64_to_cpu(sb->events);
1522 ev2 = le64_to_cpu(refsb->events);
1529 if (minor_version) {
1530 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9);
1531 sectors -= rdev->data_offset;
1533 sectors = rdev->sb_start;
1534 if (sectors < le64_to_cpu(sb->data_size))
1536 rdev->sectors = le64_to_cpu(sb->data_size);
1540 static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev)
1542 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
1543 __u64 ev1 = le64_to_cpu(sb->events);
1545 rdev->raid_disk = -1;
1546 clear_bit(Faulty, &rdev->flags);
1547 clear_bit(In_sync, &rdev->flags);
1548 clear_bit(Bitmap_sync, &rdev->flags);
1549 clear_bit(WriteMostly, &rdev->flags);
1551 if (mddev->raid_disks == 0) {
1552 mddev->major_version = 1;
1553 mddev->patch_version = 0;
1554 mddev->external = 0;
1555 mddev->chunk_sectors = le32_to_cpu(sb->chunksize);
1556 mddev->ctime = le64_to_cpu(sb->ctime);
1557 mddev->utime = le64_to_cpu(sb->utime);
1558 mddev->level = le32_to_cpu(sb->level);
1559 mddev->clevel[0] = 0;
1560 mddev->layout = le32_to_cpu(sb->layout);
1561 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1562 mddev->dev_sectors = le64_to_cpu(sb->size);
1563 mddev->events = ev1;
1564 mddev->bitmap_info.offset = 0;
1565 mddev->bitmap_info.space = 0;
1566 /* Default location for bitmap is 1K after superblock
1567 * using 3K - total of 4K
1569 mddev->bitmap_info.default_offset = 1024 >> 9;
1570 mddev->bitmap_info.default_space = (4096-1024) >> 9;
1571 mddev->reshape_backwards = 0;
1573 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1574 memcpy(mddev->uuid, sb->set_uuid, 16);
1576 mddev->max_disks = (4096-256)/2;
1578 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1579 mddev->bitmap_info.file == NULL) {
1580 mddev->bitmap_info.offset =
1581 (__s32)le32_to_cpu(sb->bitmap_offset);
1582 /* Metadata doesn't record how much space is available.
1583 * For 1.0, we assume we can use up to the superblock
1584 * if before, else to 4K beyond superblock.
1585 * For others, assume no change is possible.
1587 if (mddev->minor_version > 0)
1588 mddev->bitmap_info.space = 0;
1589 else if (mddev->bitmap_info.offset > 0)
1590 mddev->bitmap_info.space =
1591 8 - mddev->bitmap_info.offset;
1593 mddev->bitmap_info.space =
1594 -mddev->bitmap_info.offset;
1597 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1598 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1599 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1600 mddev->new_level = le32_to_cpu(sb->new_level);
1601 mddev->new_layout = le32_to_cpu(sb->new_layout);
1602 mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk);
1603 if (mddev->delta_disks < 0 ||
1604 (mddev->delta_disks == 0 &&
1605 (le32_to_cpu(sb->feature_map)
1606 & MD_FEATURE_RESHAPE_BACKWARDS)))
1607 mddev->reshape_backwards = 1;
1609 mddev->reshape_position = MaxSector;
1610 mddev->delta_disks = 0;
1611 mddev->new_level = mddev->level;
1612 mddev->new_layout = mddev->layout;
1613 mddev->new_chunk_sectors = mddev->chunk_sectors;
1616 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL)
1617 set_bit(MD_HAS_JOURNAL, &mddev->flags);
1618 } else if (mddev->pers == NULL) {
1619 /* Insist of good event counter while assembling, except for
1620 * spares (which don't need an event count) */
1622 if (rdev->desc_nr >= 0 &&
1623 rdev->desc_nr < le32_to_cpu(sb->max_dev) &&
1624 (le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < MD_DISK_ROLE_MAX ||
1625 le16_to_cpu(sb->dev_roles[rdev->desc_nr]) == MD_DISK_ROLE_JOURNAL))
1626 if (ev1 < mddev->events)
1628 } else if (mddev->bitmap) {
1629 /* If adding to array with a bitmap, then we can accept an
1630 * older device, but not too old.
1632 if (ev1 < mddev->bitmap->events_cleared)
1634 if (ev1 < mddev->events)
1635 set_bit(Bitmap_sync, &rdev->flags);
1637 if (ev1 < mddev->events)
1638 /* just a hot-add of a new device, leave raid_disk at -1 */
1641 if (mddev->level != LEVEL_MULTIPATH) {
1643 if (rdev->desc_nr < 0 ||
1644 rdev->desc_nr >= le32_to_cpu(sb->max_dev)) {
1645 role = MD_DISK_ROLE_SPARE;
1648 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1650 case MD_DISK_ROLE_SPARE: /* spare */
1652 case MD_DISK_ROLE_FAULTY: /* faulty */
1653 set_bit(Faulty, &rdev->flags);
1655 case MD_DISK_ROLE_JOURNAL: /* journal device */
1656 if (!(le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL)) {
1657 /* journal device without journal feature */
1659 "md: journal device provided without journal feature, ignoring the device\n");
1662 set_bit(Journal, &rdev->flags);
1663 rdev->journal_tail = le64_to_cpu(sb->journal_tail);
1664 rdev->raid_disk = 0;
1667 rdev->saved_raid_disk = role;
1668 if ((le32_to_cpu(sb->feature_map) &
1669 MD_FEATURE_RECOVERY_OFFSET)) {
1670 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1671 if (!(le32_to_cpu(sb->feature_map) &
1672 MD_FEATURE_RECOVERY_BITMAP))
1673 rdev->saved_raid_disk = -1;
1676 * If the array is FROZEN, then the device can't
1677 * be in_sync with rest of array.
1679 if (!test_bit(MD_RECOVERY_FROZEN,
1681 set_bit(In_sync, &rdev->flags);
1683 rdev->raid_disk = role;
1686 if (sb->devflags & WriteMostly1)
1687 set_bit(WriteMostly, &rdev->flags);
1688 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_REPLACEMENT)
1689 set_bit(Replacement, &rdev->flags);
1690 } else /* MULTIPATH are always insync */
1691 set_bit(In_sync, &rdev->flags);
1696 static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev)
1698 struct mdp_superblock_1 *sb;
1699 struct md_rdev *rdev2;
1701 /* make rdev->sb match mddev and rdev data. */
1703 sb = page_address(rdev->sb_page);
1705 sb->feature_map = 0;
1707 sb->recovery_offset = cpu_to_le64(0);
1708 memset(sb->pad3, 0, sizeof(sb->pad3));
1710 sb->utime = cpu_to_le64((__u64)mddev->utime);
1711 sb->events = cpu_to_le64(mddev->events);
1713 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1714 else if (test_bit(MD_JOURNAL_CLEAN, &mddev->flags))
1715 sb->resync_offset = cpu_to_le64(MaxSector);
1717 sb->resync_offset = cpu_to_le64(0);
1719 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
1721 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
1722 sb->size = cpu_to_le64(mddev->dev_sectors);
1723 sb->chunksize = cpu_to_le32(mddev->chunk_sectors);
1724 sb->level = cpu_to_le32(mddev->level);
1725 sb->layout = cpu_to_le32(mddev->layout);
1727 if (test_bit(WriteMostly, &rdev->flags))
1728 sb->devflags |= WriteMostly1;
1730 sb->devflags &= ~WriteMostly1;
1731 sb->data_offset = cpu_to_le64(rdev->data_offset);
1732 sb->data_size = cpu_to_le64(rdev->sectors);
1734 if (mddev->bitmap && mddev->bitmap_info.file == NULL) {
1735 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset);
1736 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
1739 if (rdev->raid_disk >= 0 && !test_bit(Journal, &rdev->flags) &&
1740 !test_bit(In_sync, &rdev->flags)) {
1742 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1743 sb->recovery_offset =
1744 cpu_to_le64(rdev->recovery_offset);
1745 if (rdev->saved_raid_disk >= 0 && mddev->bitmap)
1747 cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP);
1749 /* Note: recovery_offset and journal_tail share space */
1750 if (test_bit(Journal, &rdev->flags))
1751 sb->journal_tail = cpu_to_le64(rdev->journal_tail);
1752 if (test_bit(Replacement, &rdev->flags))
1754 cpu_to_le32(MD_FEATURE_REPLACEMENT);
1756 if (mddev->reshape_position != MaxSector) {
1757 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1758 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1759 sb->new_layout = cpu_to_le32(mddev->new_layout);
1760 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1761 sb->new_level = cpu_to_le32(mddev->new_level);
1762 sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors);
1763 if (mddev->delta_disks == 0 &&
1764 mddev->reshape_backwards)
1766 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS);
1767 if (rdev->new_data_offset != rdev->data_offset) {
1769 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET);
1770 sb->new_offset = cpu_to_le32((__u32)(rdev->new_data_offset
1771 - rdev->data_offset));
1775 if (mddev_is_clustered(mddev))
1776 sb->feature_map |= cpu_to_le32(MD_FEATURE_CLUSTERED);
1778 if (rdev->badblocks.count == 0)
1779 /* Nothing to do for bad blocks*/ ;
1780 else if (sb->bblog_offset == 0)
1781 /* Cannot record bad blocks on this device */
1782 md_error(mddev, rdev);
1784 struct badblocks *bb = &rdev->badblocks;
1785 u64 *bbp = (u64 *)page_address(rdev->bb_page);
1787 sb->feature_map |= cpu_to_le32(MD_FEATURE_BAD_BLOCKS);
1792 seq = read_seqbegin(&bb->lock);
1794 memset(bbp, 0xff, PAGE_SIZE);
1796 for (i = 0 ; i < bb->count ; i++) {
1797 u64 internal_bb = p[i];
1798 u64 store_bb = ((BB_OFFSET(internal_bb) << 10)
1799 | BB_LEN(internal_bb));
1800 bbp[i] = cpu_to_le64(store_bb);
1803 if (read_seqretry(&bb->lock, seq))
1806 bb->sector = (rdev->sb_start +
1807 (int)le32_to_cpu(sb->bblog_offset));
1808 bb->size = le16_to_cpu(sb->bblog_size);
1813 rdev_for_each(rdev2, mddev)
1814 if (rdev2->desc_nr+1 > max_dev)
1815 max_dev = rdev2->desc_nr+1;
1817 if (max_dev > le32_to_cpu(sb->max_dev)) {
1819 sb->max_dev = cpu_to_le32(max_dev);
1820 rdev->sb_size = max_dev * 2 + 256;
1821 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1822 if (rdev->sb_size & bmask)
1823 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1825 max_dev = le32_to_cpu(sb->max_dev);
1827 for (i=0; i<max_dev;i++)
1828 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_FAULTY);
1830 if (test_bit(MD_HAS_JOURNAL, &mddev->flags))
1831 sb->feature_map |= cpu_to_le32(MD_FEATURE_JOURNAL);
1833 rdev_for_each(rdev2, mddev) {
1835 if (test_bit(Faulty, &rdev2->flags))
1836 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_FAULTY);
1837 else if (test_bit(In_sync, &rdev2->flags))
1838 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1839 else if (test_bit(Journal, &rdev2->flags))
1840 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_JOURNAL);
1841 else if (rdev2->raid_disk >= 0)
1842 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1844 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_SPARE);
1847 sb->sb_csum = calc_sb_1_csum(sb);
1850 static unsigned long long
1851 super_1_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
1853 struct mdp_superblock_1 *sb;
1854 sector_t max_sectors;
1855 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1856 return 0; /* component must fit device */
1857 if (rdev->data_offset != rdev->new_data_offset)
1858 return 0; /* too confusing */
1859 if (rdev->sb_start < rdev->data_offset) {
1860 /* minor versions 1 and 2; superblock before data */
1861 max_sectors = i_size_read(rdev->bdev->bd_inode) >> 9;
1862 max_sectors -= rdev->data_offset;
1863 if (!num_sectors || num_sectors > max_sectors)
1864 num_sectors = max_sectors;
1865 } else if (rdev->mddev->bitmap_info.offset) {
1866 /* minor version 0 with bitmap we can't move */
1869 /* minor version 0; superblock after data */
1871 sb_start = (i_size_read(rdev->bdev->bd_inode) >> 9) - 8*2;
1872 sb_start &= ~(sector_t)(4*2 - 1);
1873 max_sectors = rdev->sectors + sb_start - rdev->sb_start;
1874 if (!num_sectors || num_sectors > max_sectors)
1875 num_sectors = max_sectors;
1876 rdev->sb_start = sb_start;
1878 sb = page_address(rdev->sb_page);
1879 sb->data_size = cpu_to_le64(num_sectors);
1880 sb->super_offset = cpu_to_le64(rdev->sb_start);
1881 sb->sb_csum = calc_sb_1_csum(sb);
1882 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1884 md_super_wait(rdev->mddev);
1890 super_1_allow_new_offset(struct md_rdev *rdev,
1891 unsigned long long new_offset)
1893 /* All necessary checks on new >= old have been done */
1894 struct bitmap *bitmap;
1895 if (new_offset >= rdev->data_offset)
1898 /* with 1.0 metadata, there is no metadata to tread on
1899 * so we can always move back */
1900 if (rdev->mddev->minor_version == 0)
1903 /* otherwise we must be sure not to step on
1904 * any metadata, so stay:
1905 * 36K beyond start of superblock
1906 * beyond end of badblocks
1907 * beyond write-intent bitmap
1909 if (rdev->sb_start + (32+4)*2 > new_offset)
1911 bitmap = rdev->mddev->bitmap;
1912 if (bitmap && !rdev->mddev->bitmap_info.file &&
1913 rdev->sb_start + rdev->mddev->bitmap_info.offset +
1914 bitmap->storage.file_pages * (PAGE_SIZE>>9) > new_offset)
1916 if (rdev->badblocks.sector + rdev->badblocks.size > new_offset)
1922 static struct super_type super_types[] = {
1925 .owner = THIS_MODULE,
1926 .load_super = super_90_load,
1927 .validate_super = super_90_validate,
1928 .sync_super = super_90_sync,
1929 .rdev_size_change = super_90_rdev_size_change,
1930 .allow_new_offset = super_90_allow_new_offset,
1934 .owner = THIS_MODULE,
1935 .load_super = super_1_load,
1936 .validate_super = super_1_validate,
1937 .sync_super = super_1_sync,
1938 .rdev_size_change = super_1_rdev_size_change,
1939 .allow_new_offset = super_1_allow_new_offset,
1943 static void sync_super(struct mddev *mddev, struct md_rdev *rdev)
1945 if (mddev->sync_super) {
1946 mddev->sync_super(mddev, rdev);
1950 BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types));
1952 super_types[mddev->major_version].sync_super(mddev, rdev);
1955 static int match_mddev_units(struct mddev *mddev1, struct mddev *mddev2)
1957 struct md_rdev *rdev, *rdev2;
1960 rdev_for_each_rcu(rdev, mddev1) {
1961 if (test_bit(Faulty, &rdev->flags) ||
1962 test_bit(Journal, &rdev->flags) ||
1963 rdev->raid_disk == -1)
1965 rdev_for_each_rcu(rdev2, mddev2) {
1966 if (test_bit(Faulty, &rdev2->flags) ||
1967 test_bit(Journal, &rdev2->flags) ||
1968 rdev2->raid_disk == -1)
1970 if (rdev->bdev->bd_contains ==
1971 rdev2->bdev->bd_contains) {
1981 static LIST_HEAD(pending_raid_disks);
1984 * Try to register data integrity profile for an mddev
1986 * This is called when an array is started and after a disk has been kicked
1987 * from the array. It only succeeds if all working and active component devices
1988 * are integrity capable with matching profiles.
1990 int md_integrity_register(struct mddev *mddev)
1992 struct md_rdev *rdev, *reference = NULL;
1994 if (list_empty(&mddev->disks))
1995 return 0; /* nothing to do */
1996 if (!mddev->gendisk || blk_get_integrity(mddev->gendisk))
1997 return 0; /* shouldn't register, or already is */
1998 rdev_for_each(rdev, mddev) {
1999 /* skip spares and non-functional disks */
2000 if (test_bit(Faulty, &rdev->flags))
2002 if (rdev->raid_disk < 0)
2005 /* Use the first rdev as the reference */
2009 /* does this rdev's profile match the reference profile? */
2010 if (blk_integrity_compare(reference->bdev->bd_disk,
2011 rdev->bdev->bd_disk) < 0)
2014 if (!reference || !bdev_get_integrity(reference->bdev))
2017 * All component devices are integrity capable and have matching
2018 * profiles, register the common profile for the md device.
2020 blk_integrity_register(mddev->gendisk,
2021 bdev_get_integrity(reference->bdev));
2023 printk(KERN_NOTICE "md: data integrity enabled on %s\n", mdname(mddev));
2024 if (bioset_integrity_create(mddev->bio_set, BIO_POOL_SIZE)) {
2025 printk(KERN_ERR "md: failed to create integrity pool for %s\n",
2031 EXPORT_SYMBOL(md_integrity_register);
2034 * Attempt to add an rdev, but only if it is consistent with the current
2037 int md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev)
2039 struct blk_integrity *bi_rdev;
2040 struct blk_integrity *bi_mddev;
2041 char name[BDEVNAME_SIZE];
2043 if (!mddev->gendisk)
2046 bi_rdev = bdev_get_integrity(rdev->bdev);
2047 bi_mddev = blk_get_integrity(mddev->gendisk);
2049 if (!bi_mddev) /* nothing to do */
2052 if (blk_integrity_compare(mddev->gendisk, rdev->bdev->bd_disk) != 0) {
2053 printk(KERN_NOTICE "%s: incompatible integrity profile for %s\n",
2054 mdname(mddev), bdevname(rdev->bdev, name));
2060 EXPORT_SYMBOL(md_integrity_add_rdev);
2062 static int bind_rdev_to_array(struct md_rdev *rdev, struct mddev *mddev)
2064 char b[BDEVNAME_SIZE];
2068 /* prevent duplicates */
2069 if (find_rdev(mddev, rdev->bdev->bd_dev))
2072 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2073 if (!test_bit(Journal, &rdev->flags) &&
2075 (mddev->dev_sectors == 0 || rdev->sectors < mddev->dev_sectors)) {
2077 /* Cannot change size, so fail
2078 * If mddev->level <= 0, then we don't care
2079 * about aligning sizes (e.g. linear)
2081 if (mddev->level > 0)
2084 mddev->dev_sectors = rdev->sectors;
2087 /* Verify rdev->desc_nr is unique.
2088 * If it is -1, assign a free number, else
2089 * check number is not in use
2092 if (rdev->desc_nr < 0) {
2095 choice = mddev->raid_disks;
2096 while (md_find_rdev_nr_rcu(mddev, choice))
2098 rdev->desc_nr = choice;
2100 if (md_find_rdev_nr_rcu(mddev, rdev->desc_nr)) {
2106 if (!test_bit(Journal, &rdev->flags) &&
2107 mddev->max_disks && rdev->desc_nr >= mddev->max_disks) {
2108 printk(KERN_WARNING "md: %s: array is limited to %d devices\n",
2109 mdname(mddev), mddev->max_disks);
2112 bdevname(rdev->bdev,b);
2113 strreplace(b, '/', '!');
2115 rdev->mddev = mddev;
2116 printk(KERN_INFO "md: bind<%s>\n", b);
2118 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
2121 ko = &part_to_dev(rdev->bdev->bd_part)->kobj;
2122 if (sysfs_create_link(&rdev->kobj, ko, "block"))
2123 /* failure here is OK */;
2124 rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state");
2126 list_add_rcu(&rdev->same_set, &mddev->disks);
2127 bd_link_disk_holder(rdev->bdev, mddev->gendisk);
2129 /* May as well allow recovery to be retried once */
2130 mddev->recovery_disabled++;
2135 printk(KERN_WARNING "md: failed to register dev-%s for %s\n",
2140 static void md_delayed_delete(struct work_struct *ws)
2142 struct md_rdev *rdev = container_of(ws, struct md_rdev, del_work);
2143 kobject_del(&rdev->kobj);
2144 kobject_put(&rdev->kobj);
2147 static void unbind_rdev_from_array(struct md_rdev *rdev)
2149 char b[BDEVNAME_SIZE];
2151 bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk);
2152 list_del_rcu(&rdev->same_set);
2153 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
2155 sysfs_remove_link(&rdev->kobj, "block");
2156 sysfs_put(rdev->sysfs_state);
2157 rdev->sysfs_state = NULL;
2158 rdev->badblocks.count = 0;
2159 /* We need to delay this, otherwise we can deadlock when
2160 * writing to 'remove' to "dev/state". We also need
2161 * to delay it due to rcu usage.
2164 INIT_WORK(&rdev->del_work, md_delayed_delete);
2165 kobject_get(&rdev->kobj);
2166 queue_work(md_misc_wq, &rdev->del_work);
2170 * prevent the device from being mounted, repartitioned or
2171 * otherwise reused by a RAID array (or any other kernel
2172 * subsystem), by bd_claiming the device.
2174 static int lock_rdev(struct md_rdev *rdev, dev_t dev, int shared)
2177 struct block_device *bdev;
2178 char b[BDEVNAME_SIZE];
2180 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
2181 shared ? (struct md_rdev *)lock_rdev : rdev);
2183 printk(KERN_ERR "md: could not open %s.\n",
2184 __bdevname(dev, b));
2185 return PTR_ERR(bdev);
2191 static void unlock_rdev(struct md_rdev *rdev)
2193 struct block_device *bdev = rdev->bdev;
2195 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
2198 void md_autodetect_dev(dev_t dev);
2200 static void export_rdev(struct md_rdev *rdev)
2202 char b[BDEVNAME_SIZE];
2204 printk(KERN_INFO "md: export_rdev(%s)\n",
2205 bdevname(rdev->bdev,b));
2206 md_rdev_clear(rdev);
2208 if (test_bit(AutoDetected, &rdev->flags))
2209 md_autodetect_dev(rdev->bdev->bd_dev);
2212 kobject_put(&rdev->kobj);
2215 void md_kick_rdev_from_array(struct md_rdev *rdev)
2217 unbind_rdev_from_array(rdev);
2220 EXPORT_SYMBOL_GPL(md_kick_rdev_from_array);
2222 static void export_array(struct mddev *mddev)
2224 struct md_rdev *rdev;
2226 while (!list_empty(&mddev->disks)) {
2227 rdev = list_first_entry(&mddev->disks, struct md_rdev,
2229 md_kick_rdev_from_array(rdev);
2231 mddev->raid_disks = 0;
2232 mddev->major_version = 0;
2235 static void sync_sbs(struct mddev *mddev, int nospares)
2237 /* Update each superblock (in-memory image), but
2238 * if we are allowed to, skip spares which already
2239 * have the right event counter, or have one earlier
2240 * (which would mean they aren't being marked as dirty
2241 * with the rest of the array)
2243 struct md_rdev *rdev;
2244 rdev_for_each(rdev, mddev) {
2245 if (rdev->sb_events == mddev->events ||
2247 rdev->raid_disk < 0 &&
2248 rdev->sb_events+1 == mddev->events)) {
2249 /* Don't update this superblock */
2250 rdev->sb_loaded = 2;
2252 sync_super(mddev, rdev);
2253 rdev->sb_loaded = 1;
2258 static bool does_sb_need_changing(struct mddev *mddev)
2260 struct md_rdev *rdev = NULL, *iter;
2261 struct mdp_superblock_1 *sb;
2264 /* Find a good rdev */
2265 rdev_for_each(iter, mddev)
2266 if ((iter->raid_disk >= 0) && !test_bit(Faulty, &iter->flags)) {
2271 /* No good device found. */
2275 sb = page_address(rdev->sb_page);
2276 /* Check if a device has become faulty or a spare become active */
2277 rdev_for_each(rdev, mddev) {
2278 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
2279 /* Device activated? */
2280 if (role == 0xffff && rdev->raid_disk >=0 &&
2281 !test_bit(Faulty, &rdev->flags))
2283 /* Device turned faulty? */
2284 if (test_bit(Faulty, &rdev->flags) && (role < 0xfffd))
2288 /* Check if any mddev parameters have changed */
2289 if ((mddev->dev_sectors != le64_to_cpu(sb->size)) ||
2290 (mddev->reshape_position != le64_to_cpu(sb->reshape_position)) ||
2291 (mddev->layout != le32_to_cpu(sb->layout)) ||
2292 (mddev->raid_disks != le32_to_cpu(sb->raid_disks)) ||
2293 (mddev->chunk_sectors != le32_to_cpu(sb->chunksize)))
2299 void md_update_sb(struct mddev *mddev, int force_change)
2301 struct md_rdev *rdev;
2304 int any_badblocks_changed = 0;
2309 set_bit(MD_CHANGE_DEVS, &mddev->flags);
2314 if (mddev_is_clustered(mddev)) {
2315 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
2317 if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags))
2319 ret = md_cluster_ops->metadata_update_start(mddev);
2320 /* Has someone else has updated the sb */
2321 if (!does_sb_need_changing(mddev)) {
2323 md_cluster_ops->metadata_update_cancel(mddev);
2324 bit_clear_unless(&mddev->flags, BIT(MD_CHANGE_PENDING),
2325 BIT(MD_CHANGE_DEVS) |
2326 BIT(MD_CHANGE_CLEAN));
2331 /* First make sure individual recovery_offsets are correct */
2332 rdev_for_each(rdev, mddev) {
2333 if (rdev->raid_disk >= 0 &&
2334 mddev->delta_disks >= 0 &&
2335 !test_bit(Journal, &rdev->flags) &&
2336 !test_bit(In_sync, &rdev->flags) &&
2337 mddev->curr_resync_completed > rdev->recovery_offset)
2338 rdev->recovery_offset = mddev->curr_resync_completed;
2341 if (!mddev->persistent) {
2342 clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
2343 clear_bit(MD_CHANGE_DEVS, &mddev->flags);
2344 if (!mddev->external) {
2345 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2346 rdev_for_each(rdev, mddev) {
2347 if (rdev->badblocks.changed) {
2348 rdev->badblocks.changed = 0;
2349 ack_all_badblocks(&rdev->badblocks);
2350 md_error(mddev, rdev);
2352 clear_bit(Blocked, &rdev->flags);
2353 clear_bit(BlockedBadBlocks, &rdev->flags);
2354 wake_up(&rdev->blocked_wait);
2357 wake_up(&mddev->sb_wait);
2361 spin_lock(&mddev->lock);
2363 mddev->utime = ktime_get_real_seconds();
2365 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
2367 if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags))
2368 /* just a clean<-> dirty transition, possibly leave spares alone,
2369 * though if events isn't the right even/odd, we will have to do
2375 if (mddev->degraded)
2376 /* If the array is degraded, then skipping spares is both
2377 * dangerous and fairly pointless.
2378 * Dangerous because a device that was removed from the array
2379 * might have a event_count that still looks up-to-date,
2380 * so it can be re-added without a resync.
2381 * Pointless because if there are any spares to skip,
2382 * then a recovery will happen and soon that array won't
2383 * be degraded any more and the spare can go back to sleep then.
2387 sync_req = mddev->in_sync;
2389 /* If this is just a dirty<->clean transition, and the array is clean
2390 * and 'events' is odd, we can roll back to the previous clean state */
2392 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
2393 && mddev->can_decrease_events
2394 && mddev->events != 1) {
2396 mddev->can_decrease_events = 0;
2398 /* otherwise we have to go forward and ... */
2400 mddev->can_decrease_events = nospares;
2404 * This 64-bit counter should never wrap.
2405 * Either we are in around ~1 trillion A.C., assuming
2406 * 1 reboot per second, or we have a bug...
2408 WARN_ON(mddev->events == 0);
2410 rdev_for_each(rdev, mddev) {
2411 if (rdev->badblocks.changed)
2412 any_badblocks_changed++;
2413 if (test_bit(Faulty, &rdev->flags))
2414 set_bit(FaultRecorded, &rdev->flags);
2417 sync_sbs(mddev, nospares);
2418 spin_unlock(&mddev->lock);
2420 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2421 mdname(mddev), mddev->in_sync);
2423 bitmap_update_sb(mddev->bitmap);
2424 rdev_for_each(rdev, mddev) {
2425 char b[BDEVNAME_SIZE];
2427 if (rdev->sb_loaded != 1)
2428 continue; /* no noise on spare devices */
2430 if (!test_bit(Faulty, &rdev->flags)) {
2431 md_super_write(mddev,rdev,
2432 rdev->sb_start, rdev->sb_size,
2434 pr_debug("md: (write) %s's sb offset: %llu\n",
2435 bdevname(rdev->bdev, b),
2436 (unsigned long long)rdev->sb_start);
2437 rdev->sb_events = mddev->events;
2438 if (rdev->badblocks.size) {
2439 md_super_write(mddev, rdev,
2440 rdev->badblocks.sector,
2441 rdev->badblocks.size << 9,
2443 rdev->badblocks.size = 0;
2447 pr_debug("md: %s (skipping faulty)\n",
2448 bdevname(rdev->bdev, b));
2450 if (mddev->level == LEVEL_MULTIPATH)
2451 /* only need to write one superblock... */
2454 md_super_wait(mddev);
2455 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2457 if (mddev_is_clustered(mddev) && ret == 0)
2458 md_cluster_ops->metadata_update_finish(mddev);
2460 if (mddev->in_sync != sync_req ||
2461 !bit_clear_unless(&mddev->flags, BIT(MD_CHANGE_PENDING),
2462 BIT(MD_CHANGE_DEVS) | BIT(MD_CHANGE_CLEAN)))
2463 /* have to write it out again */
2465 wake_up(&mddev->sb_wait);
2466 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
2467 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
2469 rdev_for_each(rdev, mddev) {
2470 if (test_and_clear_bit(FaultRecorded, &rdev->flags))
2471 clear_bit(Blocked, &rdev->flags);
2473 if (any_badblocks_changed)
2474 ack_all_badblocks(&rdev->badblocks);
2475 clear_bit(BlockedBadBlocks, &rdev->flags);
2476 wake_up(&rdev->blocked_wait);
2479 EXPORT_SYMBOL(md_update_sb);
2481 static int add_bound_rdev(struct md_rdev *rdev)
2483 struct mddev *mddev = rdev->mddev;
2485 bool add_journal = test_bit(Journal, &rdev->flags);
2487 if (!mddev->pers->hot_remove_disk || add_journal) {
2488 /* If there is hot_add_disk but no hot_remove_disk
2489 * then added disks for geometry changes,
2490 * and should be added immediately.
2492 super_types[mddev->major_version].
2493 validate_super(mddev, rdev);
2495 mddev_suspend(mddev);
2496 err = mddev->pers->hot_add_disk(mddev, rdev);
2498 mddev_resume(mddev);
2500 md_kick_rdev_from_array(rdev);
2504 sysfs_notify_dirent_safe(rdev->sysfs_state);
2506 set_bit(MD_CHANGE_DEVS, &mddev->flags);
2507 if (mddev->degraded)
2508 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
2509 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2510 md_new_event(mddev);
2511 md_wakeup_thread(mddev->thread);
2515 /* words written to sysfs files may, or may not, be \n terminated.
2516 * We want to accept with case. For this we use cmd_match.
2518 static int cmd_match(const char *cmd, const char *str)
2520 /* See if cmd, written into a sysfs file, matches
2521 * str. They must either be the same, or cmd can
2522 * have a trailing newline
2524 while (*cmd && *str && *cmd == *str) {
2535 struct rdev_sysfs_entry {
2536 struct attribute attr;
2537 ssize_t (*show)(struct md_rdev *, char *);
2538 ssize_t (*store)(struct md_rdev *, const char *, size_t);
2542 state_show(struct md_rdev *rdev, char *page)
2546 unsigned long flags = ACCESS_ONCE(rdev->flags);
2548 if (test_bit(Faulty, &flags) ||
2549 rdev->badblocks.unacked_exist) {
2550 len+= sprintf(page+len, "%sfaulty",sep);
2553 if (test_bit(In_sync, &flags)) {
2554 len += sprintf(page+len, "%sin_sync",sep);
2557 if (test_bit(Journal, &flags)) {
2558 len += sprintf(page+len, "%sjournal",sep);
2561 if (test_bit(WriteMostly, &flags)) {
2562 len += sprintf(page+len, "%swrite_mostly",sep);
2565 if (test_bit(Blocked, &flags) ||
2566 (rdev->badblocks.unacked_exist
2567 && !test_bit(Faulty, &flags))) {
2568 len += sprintf(page+len, "%sblocked", sep);
2571 if (!test_bit(Faulty, &flags) &&
2572 !test_bit(Journal, &flags) &&
2573 !test_bit(In_sync, &flags)) {
2574 len += sprintf(page+len, "%sspare", sep);
2577 if (test_bit(WriteErrorSeen, &flags)) {
2578 len += sprintf(page+len, "%swrite_error", sep);
2581 if (test_bit(WantReplacement, &flags)) {
2582 len += sprintf(page+len, "%swant_replacement", sep);
2585 if (test_bit(Replacement, &flags)) {
2586 len += sprintf(page+len, "%sreplacement", sep);
2590 return len+sprintf(page+len, "\n");
2594 state_store(struct md_rdev *rdev, const char *buf, size_t len)
2597 * faulty - simulates an error
2598 * remove - disconnects the device
2599 * writemostly - sets write_mostly
2600 * -writemostly - clears write_mostly
2601 * blocked - sets the Blocked flags
2602 * -blocked - clears the Blocked and possibly simulates an error
2603 * insync - sets Insync providing device isn't active
2604 * -insync - clear Insync for a device with a slot assigned,
2605 * so that it gets rebuilt based on bitmap
2606 * write_error - sets WriteErrorSeen
2607 * -write_error - clears WriteErrorSeen
2610 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
2611 md_error(rdev->mddev, rdev);
2612 if (test_bit(Faulty, &rdev->flags))
2616 } else if (cmd_match(buf, "remove")) {
2617 if (rdev->mddev->pers) {
2618 clear_bit(Blocked, &rdev->flags);
2619 remove_and_add_spares(rdev->mddev, rdev);
2621 if (rdev->raid_disk >= 0)
2624 struct mddev *mddev = rdev->mddev;
2626 if (mddev_is_clustered(mddev))
2627 err = md_cluster_ops->remove_disk(mddev, rdev);
2630 md_kick_rdev_from_array(rdev);
2632 md_update_sb(mddev, 1);
2633 md_new_event(mddev);
2636 } else if (cmd_match(buf, "writemostly")) {
2637 set_bit(WriteMostly, &rdev->flags);
2639 } else if (cmd_match(buf, "-writemostly")) {
2640 clear_bit(WriteMostly, &rdev->flags);
2642 } else if (cmd_match(buf, "blocked")) {
2643 set_bit(Blocked, &rdev->flags);
2645 } else if (cmd_match(buf, "-blocked")) {
2646 if (!test_bit(Faulty, &rdev->flags) &&
2647 rdev->badblocks.unacked_exist) {
2648 /* metadata handler doesn't understand badblocks,
2649 * so we need to fail the device
2651 md_error(rdev->mddev, rdev);
2653 clear_bit(Blocked, &rdev->flags);
2654 clear_bit(BlockedBadBlocks, &rdev->flags);
2655 wake_up(&rdev->blocked_wait);
2656 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2657 md_wakeup_thread(rdev->mddev->thread);
2660 } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) {
2661 set_bit(In_sync, &rdev->flags);
2663 } else if (cmd_match(buf, "-insync") && rdev->raid_disk >= 0 &&
2664 !test_bit(Journal, &rdev->flags)) {
2665 if (rdev->mddev->pers == NULL) {
2666 clear_bit(In_sync, &rdev->flags);
2667 rdev->saved_raid_disk = rdev->raid_disk;
2668 rdev->raid_disk = -1;
2671 } else if (cmd_match(buf, "write_error")) {
2672 set_bit(WriteErrorSeen, &rdev->flags);
2674 } else if (cmd_match(buf, "-write_error")) {
2675 clear_bit(WriteErrorSeen, &rdev->flags);
2677 } else if (cmd_match(buf, "want_replacement")) {
2678 /* Any non-spare device that is not a replacement can
2679 * become want_replacement at any time, but we then need to
2680 * check if recovery is needed.
2682 if (rdev->raid_disk >= 0 &&
2683 !test_bit(Journal, &rdev->flags) &&
2684 !test_bit(Replacement, &rdev->flags))
2685 set_bit(WantReplacement, &rdev->flags);
2686 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2687 md_wakeup_thread(rdev->mddev->thread);
2689 } else if (cmd_match(buf, "-want_replacement")) {
2690 /* Clearing 'want_replacement' is always allowed.
2691 * Once replacements starts it is too late though.
2694 clear_bit(WantReplacement, &rdev->flags);
2695 } else if (cmd_match(buf, "replacement")) {
2696 /* Can only set a device as a replacement when array has not
2697 * yet been started. Once running, replacement is automatic
2698 * from spares, or by assigning 'slot'.
2700 if (rdev->mddev->pers)
2703 set_bit(Replacement, &rdev->flags);
2706 } else if (cmd_match(buf, "-replacement")) {
2707 /* Similarly, can only clear Replacement before start */
2708 if (rdev->mddev->pers)
2711 clear_bit(Replacement, &rdev->flags);
2714 } else if (cmd_match(buf, "re-add")) {
2715 if (!rdev->mddev->pers)
2717 else if (test_bit(Faulty, &rdev->flags) && (rdev->raid_disk == -1) &&
2718 rdev->saved_raid_disk >= 0) {
2719 /* clear_bit is performed _after_ all the devices
2720 * have their local Faulty bit cleared. If any writes
2721 * happen in the meantime in the local node, they
2722 * will land in the local bitmap, which will be synced
2723 * by this node eventually
2725 if (!mddev_is_clustered(rdev->mddev) ||
2726 (err = md_cluster_ops->gather_bitmaps(rdev)) == 0) {
2727 clear_bit(Faulty, &rdev->flags);
2728 err = add_bound_rdev(rdev);
2734 sysfs_notify_dirent_safe(rdev->sysfs_state);
2735 return err ? err : len;
2737 static struct rdev_sysfs_entry rdev_state =
2738 __ATTR_PREALLOC(state, S_IRUGO|S_IWUSR, state_show, state_store);
2741 errors_show(struct md_rdev *rdev, char *page)
2743 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
2747 errors_store(struct md_rdev *rdev, const char *buf, size_t len)
2752 rv = kstrtouint(buf, 10, &n);
2755 atomic_set(&rdev->corrected_errors, n);
2758 static struct rdev_sysfs_entry rdev_errors =
2759 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
2762 slot_show(struct md_rdev *rdev, char *page)
2764 if (test_bit(Journal, &rdev->flags))
2765 return sprintf(page, "journal\n");
2766 else if (rdev->raid_disk < 0)
2767 return sprintf(page, "none\n");
2769 return sprintf(page, "%d\n", rdev->raid_disk);
2773 slot_store(struct md_rdev *rdev, const char *buf, size_t len)
2778 if (test_bit(Journal, &rdev->flags))
2780 if (strncmp(buf, "none", 4)==0)
2783 err = kstrtouint(buf, 10, (unsigned int *)&slot);
2787 if (rdev->mddev->pers && slot == -1) {
2788 /* Setting 'slot' on an active array requires also
2789 * updating the 'rd%d' link, and communicating
2790 * with the personality with ->hot_*_disk.
2791 * For now we only support removing
2792 * failed/spare devices. This normally happens automatically,
2793 * but not when the metadata is externally managed.
2795 if (rdev->raid_disk == -1)
2797 /* personality does all needed checks */
2798 if (rdev->mddev->pers->hot_remove_disk == NULL)
2800 clear_bit(Blocked, &rdev->flags);
2801 remove_and_add_spares(rdev->mddev, rdev);
2802 if (rdev->raid_disk >= 0)
2804 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2805 md_wakeup_thread(rdev->mddev->thread);
2806 } else if (rdev->mddev->pers) {
2807 /* Activating a spare .. or possibly reactivating
2808 * if we ever get bitmaps working here.
2812 if (rdev->raid_disk != -1)
2815 if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery))
2818 if (rdev->mddev->pers->hot_add_disk == NULL)
2821 if (slot >= rdev->mddev->raid_disks &&
2822 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
2825 rdev->raid_disk = slot;
2826 if (test_bit(In_sync, &rdev->flags))
2827 rdev->saved_raid_disk = slot;
2829 rdev->saved_raid_disk = -1;
2830 clear_bit(In_sync, &rdev->flags);
2831 clear_bit(Bitmap_sync, &rdev->flags);
2832 err = rdev->mddev->pers->
2833 hot_add_disk(rdev->mddev, rdev);
2835 rdev->raid_disk = -1;
2838 sysfs_notify_dirent_safe(rdev->sysfs_state);
2839 if (sysfs_link_rdev(rdev->mddev, rdev))
2840 /* failure here is OK */;
2841 /* don't wakeup anyone, leave that to userspace. */
2843 if (slot >= rdev->mddev->raid_disks &&
2844 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
2846 rdev->raid_disk = slot;
2847 /* assume it is working */
2848 clear_bit(Faulty, &rdev->flags);
2849 clear_bit(WriteMostly, &rdev->flags);
2850 set_bit(In_sync, &rdev->flags);
2851 sysfs_notify_dirent_safe(rdev->sysfs_state);
2856 static struct rdev_sysfs_entry rdev_slot =
2857 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
2860 offset_show(struct md_rdev *rdev, char *page)
2862 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
2866 offset_store(struct md_rdev *rdev, const char *buf, size_t len)
2868 unsigned long long offset;
2869 if (kstrtoull(buf, 10, &offset) < 0)
2871 if (rdev->mddev->pers && rdev->raid_disk >= 0)
2873 if (rdev->sectors && rdev->mddev->external)
2874 /* Must set offset before size, so overlap checks
2877 rdev->data_offset = offset;
2878 rdev->new_data_offset = offset;
2882 static struct rdev_sysfs_entry rdev_offset =
2883 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
2885 static ssize_t new_offset_show(struct md_rdev *rdev, char *page)
2887 return sprintf(page, "%llu\n",
2888 (unsigned long long)rdev->new_data_offset);
2891 static ssize_t new_offset_store(struct md_rdev *rdev,
2892 const char *buf, size_t len)
2894 unsigned long long new_offset;
2895 struct mddev *mddev = rdev->mddev;
2897 if (kstrtoull(buf, 10, &new_offset) < 0)
2900 if (mddev->sync_thread ||
2901 test_bit(MD_RECOVERY_RUNNING,&mddev->recovery))
2903 if (new_offset == rdev->data_offset)
2904 /* reset is always permitted */
2906 else if (new_offset > rdev->data_offset) {
2907 /* must not push array size beyond rdev_sectors */
2908 if (new_offset - rdev->data_offset
2909 + mddev->dev_sectors > rdev->sectors)
2912 /* Metadata worries about other space details. */
2914 /* decreasing the offset is inconsistent with a backwards
2917 if (new_offset < rdev->data_offset &&
2918 mddev->reshape_backwards)
2920 /* Increasing offset is inconsistent with forwards
2921 * reshape. reshape_direction should be set to
2922 * 'backwards' first.
2924 if (new_offset > rdev->data_offset &&
2925 !mddev->reshape_backwards)
2928 if (mddev->pers && mddev->persistent &&
2929 !super_types[mddev->major_version]
2930 .allow_new_offset(rdev, new_offset))
2932 rdev->new_data_offset = new_offset;
2933 if (new_offset > rdev->data_offset)
2934 mddev->reshape_backwards = 1;
2935 else if (new_offset < rdev->data_offset)
2936 mddev->reshape_backwards = 0;
2940 static struct rdev_sysfs_entry rdev_new_offset =
2941 __ATTR(new_offset, S_IRUGO|S_IWUSR, new_offset_show, new_offset_store);
2944 rdev_size_show(struct md_rdev *rdev, char *page)
2946 return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2);
2949 static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
2951 /* check if two start/length pairs overlap */
2959 static int strict_blocks_to_sectors(const char *buf, sector_t *sectors)
2961 unsigned long long blocks;
2964 if (kstrtoull(buf, 10, &blocks) < 0)
2967 if (blocks & 1ULL << (8 * sizeof(blocks) - 1))
2968 return -EINVAL; /* sector conversion overflow */
2971 if (new != blocks * 2)
2972 return -EINVAL; /* unsigned long long to sector_t overflow */
2979 rdev_size_store(struct md_rdev *rdev, const char *buf, size_t len)
2981 struct mddev *my_mddev = rdev->mddev;
2982 sector_t oldsectors = rdev->sectors;
2985 if (test_bit(Journal, &rdev->flags))
2987 if (strict_blocks_to_sectors(buf, §ors) < 0)
2989 if (rdev->data_offset != rdev->new_data_offset)
2990 return -EINVAL; /* too confusing */
2991 if (my_mddev->pers && rdev->raid_disk >= 0) {
2992 if (my_mddev->persistent) {
2993 sectors = super_types[my_mddev->major_version].
2994 rdev_size_change(rdev, sectors);
2997 } else if (!sectors)
2998 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) -
3000 if (!my_mddev->pers->resize)
3001 /* Cannot change size for RAID0 or Linear etc */
3004 if (sectors < my_mddev->dev_sectors)
3005 return -EINVAL; /* component must fit device */
3007 rdev->sectors = sectors;
3008 if (sectors > oldsectors && my_mddev->external) {
3009 /* Need to check that all other rdevs with the same
3010 * ->bdev do not overlap. 'rcu' is sufficient to walk
3011 * the rdev lists safely.
3012 * This check does not provide a hard guarantee, it
3013 * just helps avoid dangerous mistakes.
3015 struct mddev *mddev;
3017 struct list_head *tmp;
3020 for_each_mddev(mddev, tmp) {
3021 struct md_rdev *rdev2;
3023 rdev_for_each(rdev2, mddev)
3024 if (rdev->bdev == rdev2->bdev &&
3026 overlaps(rdev->data_offset, rdev->sectors,
3039 /* Someone else could have slipped in a size
3040 * change here, but doing so is just silly.
3041 * We put oldsectors back because we *know* it is
3042 * safe, and trust userspace not to race with
3045 rdev->sectors = oldsectors;
3052 static struct rdev_sysfs_entry rdev_size =
3053 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
3055 static ssize_t recovery_start_show(struct md_rdev *rdev, char *page)
3057 unsigned long long recovery_start = rdev->recovery_offset;
3059 if (test_bit(In_sync, &rdev->flags) ||
3060 recovery_start == MaxSector)
3061 return sprintf(page, "none\n");
3063 return sprintf(page, "%llu\n", recovery_start);
3066 static ssize_t recovery_start_store(struct md_rdev *rdev, const char *buf, size_t len)
3068 unsigned long long recovery_start;
3070 if (cmd_match(buf, "none"))
3071 recovery_start = MaxSector;
3072 else if (kstrtoull(buf, 10, &recovery_start))
3075 if (rdev->mddev->pers &&
3076 rdev->raid_disk >= 0)
3079 rdev->recovery_offset = recovery_start;
3080 if (recovery_start == MaxSector)
3081 set_bit(In_sync, &rdev->flags);
3083 clear_bit(In_sync, &rdev->flags);
3087 static struct rdev_sysfs_entry rdev_recovery_start =
3088 __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store);
3090 /* sysfs access to bad-blocks list.
3091 * We present two files.
3092 * 'bad-blocks' lists sector numbers and lengths of ranges that
3093 * are recorded as bad. The list is truncated to fit within
3094 * the one-page limit of sysfs.
3095 * Writing "sector length" to this file adds an acknowledged
3097 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
3098 * been acknowledged. Writing to this file adds bad blocks
3099 * without acknowledging them. This is largely for testing.
3101 static ssize_t bb_show(struct md_rdev *rdev, char *page)
3103 return badblocks_show(&rdev->badblocks, page, 0);
3105 static ssize_t bb_store(struct md_rdev *rdev, const char *page, size_t len)
3107 int rv = badblocks_store(&rdev->badblocks, page, len, 0);
3108 /* Maybe that ack was all we needed */
3109 if (test_and_clear_bit(BlockedBadBlocks, &rdev->flags))
3110 wake_up(&rdev->blocked_wait);
3113 static struct rdev_sysfs_entry rdev_bad_blocks =
3114 __ATTR(bad_blocks, S_IRUGO|S_IWUSR, bb_show, bb_store);
3116 static ssize_t ubb_show(struct md_rdev *rdev, char *page)
3118 return badblocks_show(&rdev->badblocks, page, 1);
3120 static ssize_t ubb_store(struct md_rdev *rdev, const char *page, size_t len)
3122 return badblocks_store(&rdev->badblocks, page, len, 1);
3124 static struct rdev_sysfs_entry rdev_unack_bad_blocks =
3125 __ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store);
3127 static struct attribute *rdev_default_attrs[] = {
3132 &rdev_new_offset.attr,
3134 &rdev_recovery_start.attr,
3135 &rdev_bad_blocks.attr,
3136 &rdev_unack_bad_blocks.attr,
3140 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
3142 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3143 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3149 return entry->show(rdev, page);
3153 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
3154 const char *page, size_t length)
3156 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3157 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3159 struct mddev *mddev = rdev->mddev;
3163 if (!capable(CAP_SYS_ADMIN))
3165 rv = mddev ? mddev_lock(mddev): -EBUSY;
3167 if (rdev->mddev == NULL)
3170 rv = entry->store(rdev, page, length);
3171 mddev_unlock(mddev);
3176 static void rdev_free(struct kobject *ko)
3178 struct md_rdev *rdev = container_of(ko, struct md_rdev, kobj);
3181 static const struct sysfs_ops rdev_sysfs_ops = {
3182 .show = rdev_attr_show,
3183 .store = rdev_attr_store,
3185 static struct kobj_type rdev_ktype = {
3186 .release = rdev_free,
3187 .sysfs_ops = &rdev_sysfs_ops,
3188 .default_attrs = rdev_default_attrs,
3191 int md_rdev_init(struct md_rdev *rdev)
3194 rdev->saved_raid_disk = -1;
3195 rdev->raid_disk = -1;
3197 rdev->data_offset = 0;
3198 rdev->new_data_offset = 0;
3199 rdev->sb_events = 0;
3200 rdev->last_read_error = 0;
3201 rdev->sb_loaded = 0;
3202 rdev->bb_page = NULL;
3203 atomic_set(&rdev->nr_pending, 0);
3204 atomic_set(&rdev->read_errors, 0);
3205 atomic_set(&rdev->corrected_errors, 0);
3207 INIT_LIST_HEAD(&rdev->same_set);
3208 init_waitqueue_head(&rdev->blocked_wait);
3210 /* Add space to store bad block list.
3211 * This reserves the space even on arrays where it cannot
3212 * be used - I wonder if that matters
3214 return badblocks_init(&rdev->badblocks, 0);
3216 EXPORT_SYMBOL_GPL(md_rdev_init);
3218 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3220 * mark the device faulty if:
3222 * - the device is nonexistent (zero size)
3223 * - the device has no valid superblock
3225 * a faulty rdev _never_ has rdev->sb set.
3227 static struct md_rdev *md_import_device(dev_t newdev, int super_format, int super_minor)
3229 char b[BDEVNAME_SIZE];
3231 struct md_rdev *rdev;
3234 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
3236 printk(KERN_ERR "md: could not alloc mem for new device!\n");
3237 return ERR_PTR(-ENOMEM);
3240 err = md_rdev_init(rdev);
3243 err = alloc_disk_sb(rdev);
3247 err = lock_rdev(rdev, newdev, super_format == -2);
3251 kobject_init(&rdev->kobj, &rdev_ktype);
3253 size = i_size_read(rdev->bdev->bd_inode) >> BLOCK_SIZE_BITS;
3256 "md: %s has zero or unknown size, marking faulty!\n",
3257 bdevname(rdev->bdev,b));
3262 if (super_format >= 0) {
3263 err = super_types[super_format].
3264 load_super(rdev, NULL, super_minor);
3265 if (err == -EINVAL) {
3267 "md: %s does not have a valid v%d.%d "
3268 "superblock, not importing!\n",
3269 bdevname(rdev->bdev,b),
3270 super_format, super_minor);
3275 "md: could not read %s's sb, not importing!\n",
3276 bdevname(rdev->bdev,b));
3286 md_rdev_clear(rdev);
3288 return ERR_PTR(err);
3292 * Check a full RAID array for plausibility
3295 static void analyze_sbs(struct mddev *mddev)
3298 struct md_rdev *rdev, *freshest, *tmp;
3299 char b[BDEVNAME_SIZE];
3302 rdev_for_each_safe(rdev, tmp, mddev)
3303 switch (super_types[mddev->major_version].
3304 load_super(rdev, freshest, mddev->minor_version)) {
3312 "md: fatal superblock inconsistency in %s"
3313 " -- removing from array\n",
3314 bdevname(rdev->bdev,b));
3315 md_kick_rdev_from_array(rdev);
3318 super_types[mddev->major_version].
3319 validate_super(mddev, freshest);
3322 rdev_for_each_safe(rdev, tmp, mddev) {
3323 if (mddev->max_disks &&
3324 (rdev->desc_nr >= mddev->max_disks ||
3325 i > mddev->max_disks)) {
3327 "md: %s: %s: only %d devices permitted\n",
3328 mdname(mddev), bdevname(rdev->bdev, b),
3330 md_kick_rdev_from_array(rdev);
3333 if (rdev != freshest) {
3334 if (super_types[mddev->major_version].
3335 validate_super(mddev, rdev)) {
3336 printk(KERN_WARNING "md: kicking non-fresh %s"
3338 bdevname(rdev->bdev,b));
3339 md_kick_rdev_from_array(rdev);
3343 if (mddev->level == LEVEL_MULTIPATH) {
3344 rdev->desc_nr = i++;
3345 rdev->raid_disk = rdev->desc_nr;
3346 set_bit(In_sync, &rdev->flags);
3347 } else if (rdev->raid_disk >=
3348 (mddev->raid_disks - min(0, mddev->delta_disks)) &&
3349 !test_bit(Journal, &rdev->flags)) {
3350 rdev->raid_disk = -1;
3351 clear_bit(In_sync, &rdev->flags);
3356 /* Read a fixed-point number.
3357 * Numbers in sysfs attributes should be in "standard" units where
3358 * possible, so time should be in seconds.
3359 * However we internally use a a much smaller unit such as
3360 * milliseconds or jiffies.
3361 * This function takes a decimal number with a possible fractional
3362 * component, and produces an integer which is the result of
3363 * multiplying that number by 10^'scale'.
3364 * all without any floating-point arithmetic.
3366 int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale)
3368 unsigned long result = 0;
3370 while (isdigit(*cp) || (*cp == '.' && decimals < 0)) {
3373 else if (decimals < scale) {
3376 result = result * 10 + value;
3388 while (decimals < scale) {
3397 safe_delay_show(struct mddev *mddev, char *page)
3399 int msec = (mddev->safemode_delay*1000)/HZ;
3400 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
3403 safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len)
3407 if (mddev_is_clustered(mddev)) {
3408 pr_info("md: Safemode is disabled for clustered mode\n");
3412 if (strict_strtoul_scaled(cbuf, &msec, 3) < 0)
3415 mddev->safemode_delay = 0;
3417 unsigned long old_delay = mddev->safemode_delay;
3418 unsigned long new_delay = (msec*HZ)/1000;
3422 mddev->safemode_delay = new_delay;
3423 if (new_delay < old_delay || old_delay == 0)
3424 mod_timer(&mddev->safemode_timer, jiffies+1);
3428 static struct md_sysfs_entry md_safe_delay =
3429 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
3432 level_show(struct mddev *mddev, char *page)
3434 struct md_personality *p;
3436 spin_lock(&mddev->lock);
3439 ret = sprintf(page, "%s\n", p->name);
3440 else if (mddev->clevel[0])
3441 ret = sprintf(page, "%s\n", mddev->clevel);
3442 else if (mddev->level != LEVEL_NONE)
3443 ret = sprintf(page, "%d\n", mddev->level);
3446 spin_unlock(&mddev->lock);
3451 level_store(struct mddev *mddev, const char *buf, size_t len)
3456 struct md_personality *pers, *oldpers;
3458 void *priv, *oldpriv;
3459 struct md_rdev *rdev;
3461 if (slen == 0 || slen >= sizeof(clevel))
3464 rv = mddev_lock(mddev);
3468 if (mddev->pers == NULL) {
3469 strncpy(mddev->clevel, buf, slen);
3470 if (mddev->clevel[slen-1] == '\n')
3472 mddev->clevel[slen] = 0;
3473 mddev->level = LEVEL_NONE;
3481 /* request to change the personality. Need to ensure:
3482 * - array is not engaged in resync/recovery/reshape
3483 * - old personality can be suspended
3484 * - new personality will access other array.
3488 if (mddev->sync_thread ||
3489 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3490 mddev->reshape_position != MaxSector ||
3491 mddev->sysfs_active)
3495 if (!mddev->pers->quiesce) {
3496 printk(KERN_WARNING "md: %s: %s does not support online personality change\n",
3497 mdname(mddev), mddev->pers->name);
3501 /* Now find the new personality */
3502 strncpy(clevel, buf, slen);
3503 if (clevel[slen-1] == '\n')
3506 if (kstrtol(clevel, 10, &level))
3509 if (request_module("md-%s", clevel) != 0)
3510 request_module("md-level-%s", clevel);
3511 spin_lock(&pers_lock);
3512 pers = find_pers(level, clevel);
3513 if (!pers || !try_module_get(pers->owner)) {
3514 spin_unlock(&pers_lock);
3515 printk(KERN_WARNING "md: personality %s not loaded\n", clevel);
3519 spin_unlock(&pers_lock);
3521 if (pers == mddev->pers) {
3522 /* Nothing to do! */
3523 module_put(pers->owner);
3527 if (!pers->takeover) {
3528 module_put(pers->owner);
3529 printk(KERN_WARNING "md: %s: %s does not support personality takeover\n",
3530 mdname(mddev), clevel);
3535 rdev_for_each(rdev, mddev)
3536 rdev->new_raid_disk = rdev->raid_disk;
3538 /* ->takeover must set new_* and/or delta_disks
3539 * if it succeeds, and may set them when it fails.
3541 priv = pers->takeover(mddev);
3543 mddev->new_level = mddev->level;
3544 mddev->new_layout = mddev->layout;
3545 mddev->new_chunk_sectors = mddev->chunk_sectors;
3546 mddev->raid_disks -= mddev->delta_disks;
3547 mddev->delta_disks = 0;
3548 mddev->reshape_backwards = 0;
3549 module_put(pers->owner);
3550 printk(KERN_WARNING "md: %s: %s would not accept array\n",
3551 mdname(mddev), clevel);
3556 /* Looks like we have a winner */
3557 mddev_suspend(mddev);
3558 mddev_detach(mddev);
3560 spin_lock(&mddev->lock);
3561 oldpers = mddev->pers;
3562 oldpriv = mddev->private;
3564 mddev->private = priv;
3565 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
3566 mddev->level = mddev->new_level;
3567 mddev->layout = mddev->new_layout;
3568 mddev->chunk_sectors = mddev->new_chunk_sectors;
3569 mddev->delta_disks = 0;
3570 mddev->reshape_backwards = 0;
3571 mddev->degraded = 0;
3572 spin_unlock(&mddev->lock);
3574 if (oldpers->sync_request == NULL &&
3576 /* We are converting from a no-redundancy array
3577 * to a redundancy array and metadata is managed
3578 * externally so we need to be sure that writes
3579 * won't block due to a need to transition
3581 * until external management is started.
3584 mddev->safemode_delay = 0;
3585 mddev->safemode = 0;
3588 oldpers->free(mddev, oldpriv);
3590 if (oldpers->sync_request == NULL &&
3591 pers->sync_request != NULL) {
3592 /* need to add the md_redundancy_group */
3593 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
3595 "md: cannot register extra attributes for %s\n",
3597 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action");
3599 if (oldpers->sync_request != NULL &&
3600 pers->sync_request == NULL) {
3601 /* need to remove the md_redundancy_group */
3602 if (mddev->to_remove == NULL)
3603 mddev->to_remove = &md_redundancy_group;
3606 module_put(oldpers->owner);
3608 rdev_for_each(rdev, mddev) {
3609 if (rdev->raid_disk < 0)
3611 if (rdev->new_raid_disk >= mddev->raid_disks)
3612 rdev->new_raid_disk = -1;
3613 if (rdev->new_raid_disk == rdev->raid_disk)
3615 sysfs_unlink_rdev(mddev, rdev);
3617 rdev_for_each(rdev, mddev) {
3618 if (rdev->raid_disk < 0)
3620 if (rdev->new_raid_disk == rdev->raid_disk)
3622 rdev->raid_disk = rdev->new_raid_disk;
3623 if (rdev->raid_disk < 0)
3624 clear_bit(In_sync, &rdev->flags);
3626 if (sysfs_link_rdev(mddev, rdev))
3627 printk(KERN_WARNING "md: cannot register rd%d"
3628 " for %s after level change\n",
3629 rdev->raid_disk, mdname(mddev));
3633 if (pers->sync_request == NULL) {
3634 /* this is now an array without redundancy, so
3635 * it must always be in_sync
3638 del_timer_sync(&mddev->safemode_timer);
3640 blk_set_stacking_limits(&mddev->queue->limits);
3642 set_bit(MD_CHANGE_DEVS, &mddev->flags);
3643 mddev_resume(mddev);
3645 md_update_sb(mddev, 1);
3646 sysfs_notify(&mddev->kobj, NULL, "level");
3647 md_new_event(mddev);
3650 mddev_unlock(mddev);
3654 static struct md_sysfs_entry md_level =
3655 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
3658 layout_show(struct mddev *mddev, char *page)
3660 /* just a number, not meaningful for all levels */
3661 if (mddev->reshape_position != MaxSector &&
3662 mddev->layout != mddev->new_layout)
3663 return sprintf(page, "%d (%d)\n",
3664 mddev->new_layout, mddev->layout);
3665 return sprintf(page, "%d\n", mddev->layout);
3669 layout_store(struct mddev *mddev, const char *buf, size_t len)
3674 err = kstrtouint(buf, 10, &n);
3677 err = mddev_lock(mddev);
3682 if (mddev->pers->check_reshape == NULL)
3687 mddev->new_layout = n;
3688 err = mddev->pers->check_reshape(mddev);
3690 mddev->new_layout = mddev->layout;
3693 mddev->new_layout = n;
3694 if (mddev->reshape_position == MaxSector)
3697 mddev_unlock(mddev);
3700 static struct md_sysfs_entry md_layout =
3701 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
3704 raid_disks_show(struct mddev *mddev, char *page)
3706 if (mddev->raid_disks == 0)
3708 if (mddev->reshape_position != MaxSector &&
3709 mddev->delta_disks != 0)
3710 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
3711 mddev->raid_disks - mddev->delta_disks);
3712 return sprintf(page, "%d\n", mddev->raid_disks);
3715 static int update_raid_disks(struct mddev *mddev, int raid_disks);
3718 raid_disks_store(struct mddev *mddev, const char *buf, size_t len)
3723 err = kstrtouint(buf, 10, &n);
3727 err = mddev_lock(mddev);
3731 err = update_raid_disks(mddev, n);
3732 else if (mddev->reshape_position != MaxSector) {
3733 struct md_rdev *rdev;
3734 int olddisks = mddev->raid_disks - mddev->delta_disks;
3737 rdev_for_each(rdev, mddev) {
3739 rdev->data_offset < rdev->new_data_offset)
3742 rdev->data_offset > rdev->new_data_offset)
3746 mddev->delta_disks = n - olddisks;
3747 mddev->raid_disks = n;
3748 mddev->reshape_backwards = (mddev->delta_disks < 0);
3750 mddev->raid_disks = n;
3752 mddev_unlock(mddev);
3753 return err ? err : len;
3755 static struct md_sysfs_entry md_raid_disks =
3756 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
3759 chunk_size_show(struct mddev *mddev, char *page)
3761 if (mddev->reshape_position != MaxSector &&
3762 mddev->chunk_sectors != mddev->new_chunk_sectors)
3763 return sprintf(page, "%d (%d)\n",
3764 mddev->new_chunk_sectors << 9,
3765 mddev->chunk_sectors << 9);
3766 return sprintf(page, "%d\n", mddev->chunk_sectors << 9);
3770 chunk_size_store(struct mddev *mddev, const char *buf, size_t len)
3775 err = kstrtoul(buf, 10, &n);
3779 err = mddev_lock(mddev);
3783 if (mddev->pers->check_reshape == NULL)
3788 mddev->new_chunk_sectors = n >> 9;
3789 err = mddev->pers->check_reshape(mddev);
3791 mddev->new_chunk_sectors = mddev->chunk_sectors;
3794 mddev->new_chunk_sectors = n >> 9;
3795 if (mddev->reshape_position == MaxSector)
3796 mddev->chunk_sectors = n >> 9;
3798 mddev_unlock(mddev);
3801 static struct md_sysfs_entry md_chunk_size =
3802 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
3805 resync_start_show(struct mddev *mddev, char *page)
3807 if (mddev->recovery_cp == MaxSector)
3808 return sprintf(page, "none\n");
3809 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
3813 resync_start_store(struct mddev *mddev, const char *buf, size_t len)
3815 unsigned long long n;
3818 if (cmd_match(buf, "none"))
3821 err = kstrtoull(buf, 10, &n);
3824 if (n != (sector_t)n)
3828 err = mddev_lock(mddev);
3831 if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
3835 mddev->recovery_cp = n;
3837 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
3839 mddev_unlock(mddev);
3842 static struct md_sysfs_entry md_resync_start =
3843 __ATTR_PREALLOC(resync_start, S_IRUGO|S_IWUSR,
3844 resync_start_show, resync_start_store);
3847 * The array state can be:
3850 * No devices, no size, no level
3851 * Equivalent to STOP_ARRAY ioctl
3853 * May have some settings, but array is not active
3854 * all IO results in error
3855 * When written, doesn't tear down array, but just stops it
3856 * suspended (not supported yet)
3857 * All IO requests will block. The array can be reconfigured.
3858 * Writing this, if accepted, will block until array is quiescent
3860 * no resync can happen. no superblocks get written.
3861 * write requests fail
3863 * like readonly, but behaves like 'clean' on a write request.
3865 * clean - no pending writes, but otherwise active.
3866 * When written to inactive array, starts without resync
3867 * If a write request arrives then
3868 * if metadata is known, mark 'dirty' and switch to 'active'.
3869 * if not known, block and switch to write-pending
3870 * If written to an active array that has pending writes, then fails.
3872 * fully active: IO and resync can be happening.
3873 * When written to inactive array, starts with resync
3876 * clean, but writes are blocked waiting for 'active' to be written.
3879 * like active, but no writes have been seen for a while (100msec).
3882 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
3883 write_pending, active_idle, bad_word};
3884 static char *array_states[] = {
3885 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3886 "write-pending", "active-idle", NULL };
3888 static int match_word(const char *word, char **list)
3891 for (n=0; list[n]; n++)
3892 if (cmd_match(word, list[n]))
3898 array_state_show(struct mddev *mddev, char *page)
3900 enum array_state st = inactive;
3911 if (test_bit(MD_CHANGE_PENDING, &mddev->flags))
3913 else if (mddev->in_sync)
3915 else if (mddev->safemode)
3921 if (list_empty(&mddev->disks) &&
3922 mddev->raid_disks == 0 &&
3923 mddev->dev_sectors == 0)
3928 return sprintf(page, "%s\n", array_states[st]);
3931 static int do_md_stop(struct mddev *mddev, int ro, struct block_device *bdev);
3932 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev);
3933 static int do_md_run(struct mddev *mddev);
3934 static int restart_array(struct mddev *mddev);
3937 array_state_store(struct mddev *mddev, const char *buf, size_t len)
3940 enum array_state st = match_word(buf, array_states);
3942 if (mddev->pers && (st == active || st == clean) && mddev->ro != 1) {
3943 /* don't take reconfig_mutex when toggling between
3946 spin_lock(&mddev->lock);
3948 restart_array(mddev);
3949 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
3950 wake_up(&mddev->sb_wait);
3952 } else /* st == clean */ {
3953 restart_array(mddev);
3954 if (atomic_read(&mddev->writes_pending) == 0) {
3955 if (mddev->in_sync == 0) {
3957 if (mddev->safemode == 1)
3958 mddev->safemode = 0;
3959 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
3966 sysfs_notify_dirent_safe(mddev->sysfs_state);
3967 spin_unlock(&mddev->lock);
3970 err = mddev_lock(mddev);
3978 /* stopping an active array */
3979 err = do_md_stop(mddev, 0, NULL);
3982 /* stopping an active array */
3984 err = do_md_stop(mddev, 2, NULL);
3986 err = 0; /* already inactive */
3989 break; /* not supported yet */
3992 err = md_set_readonly(mddev, NULL);
3995 set_disk_ro(mddev->gendisk, 1);
3996 err = do_md_run(mddev);
4002 err = md_set_readonly(mddev, NULL);
4003 else if (mddev->ro == 1)
4004 err = restart_array(mddev);
4007 set_disk_ro(mddev->gendisk, 0);
4011 err = do_md_run(mddev);
4016 err = restart_array(mddev);
4019 spin_lock(&mddev->lock);
4020 if (atomic_read(&mddev->writes_pending) == 0) {
4021 if (mddev->in_sync == 0) {
4023 if (mddev->safemode == 1)
4024 mddev->safemode = 0;
4025 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
4030 spin_unlock(&mddev->lock);
4036 err = restart_array(mddev);
4039 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
4040 wake_up(&mddev->sb_wait);
4044 set_disk_ro(mddev->gendisk, 0);
4045 err = do_md_run(mddev);
4050 /* these cannot be set */
4055 if (mddev->hold_active == UNTIL_IOCTL)
4056 mddev->hold_active = 0;
4057 sysfs_notify_dirent_safe(mddev->sysfs_state);
4059 mddev_unlock(mddev);
4062 static struct md_sysfs_entry md_array_state =
4063 __ATTR_PREALLOC(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
4066 max_corrected_read_errors_show(struct mddev *mddev, char *page) {
4067 return sprintf(page, "%d\n",
4068 atomic_read(&mddev->max_corr_read_errors));
4072 max_corrected_read_errors_store(struct mddev *mddev, const char *buf, size_t len)
4077 rv = kstrtouint(buf, 10, &n);
4080 atomic_set(&mddev->max_corr_read_errors, n);
4084 static struct md_sysfs_entry max_corr_read_errors =
4085 __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show,
4086 max_corrected_read_errors_store);
4089 null_show(struct mddev *mddev, char *page)
4095 new_dev_store(struct mddev *mddev, const char *buf, size_t len)
4097 /* buf must be %d:%d\n? giving major and minor numbers */
4098 /* The new device is added to the array.
4099 * If the array has a persistent superblock, we read the
4100 * superblock to initialise info and check validity.
4101 * Otherwise, only checking done is that in bind_rdev_to_array,
4102 * which mainly checks size.
4105 int major = simple_strtoul(buf, &e, 10);
4108 struct md_rdev *rdev;
4111 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
4113 minor = simple_strtoul(e+1, &e, 10);
4114 if (*e && *e != '\n')
4116 dev = MKDEV(major, minor);
4117 if (major != MAJOR(dev) ||
4118 minor != MINOR(dev))
4121 flush_workqueue(md_misc_wq);
4123 err = mddev_lock(mddev);
4126 if (mddev->persistent) {
4127 rdev = md_import_device(dev, mddev->major_version,
4128 mddev->minor_version);
4129 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
4130 struct md_rdev *rdev0
4131 = list_entry(mddev->disks.next,
4132 struct md_rdev, same_set);
4133 err = super_types[mddev->major_version]
4134 .load_super(rdev, rdev0, mddev->minor_version);
4138 } else if (mddev->external)
4139 rdev = md_import_device(dev, -2, -1);
4141 rdev = md_import_device(dev, -1, -1);
4144 mddev_unlock(mddev);
4145 return PTR_ERR(rdev);
4147 err = bind_rdev_to_array(rdev, mddev);
4151 mddev_unlock(mddev);
4152 return err ? err : len;
4155 static struct md_sysfs_entry md_new_device =
4156 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
4159 bitmap_store(struct mddev *mddev, const char *buf, size_t len)
4162 unsigned long chunk, end_chunk;
4165 err = mddev_lock(mddev);
4170 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
4172 chunk = end_chunk = simple_strtoul(buf, &end, 0);
4173 if (buf == end) break;
4174 if (*end == '-') { /* range */
4176 end_chunk = simple_strtoul(buf, &end, 0);
4177 if (buf == end) break;
4179 if (*end && !isspace(*end)) break;
4180 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
4181 buf = skip_spaces(end);
4183 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
4185 mddev_unlock(mddev);
4189 static struct md_sysfs_entry md_bitmap =
4190 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
4193 size_show(struct mddev *mddev, char *page)
4195 return sprintf(page, "%llu\n",
4196 (unsigned long long)mddev->dev_sectors / 2);
4199 static int update_size(struct mddev *mddev, sector_t num_sectors);
4202 size_store(struct mddev *mddev, const char *buf, size_t len)
4204 /* If array is inactive, we can reduce the component size, but
4205 * not increase it (except from 0).
4206 * If array is active, we can try an on-line resize
4209 int err = strict_blocks_to_sectors(buf, §ors);
4213 err = mddev_lock(mddev);
4217 err = update_size(mddev, sectors);
4219 md_update_sb(mddev, 1);
4221 if (mddev->dev_sectors == 0 ||
4222 mddev->dev_sectors > sectors)
4223 mddev->dev_sectors = sectors;
4227 mddev_unlock(mddev);
4228 return err ? err : len;
4231 static struct md_sysfs_entry md_size =
4232 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
4234 /* Metadata version.
4236 * 'none' for arrays with no metadata (good luck...)
4237 * 'external' for arrays with externally managed metadata,
4238 * or N.M for internally known formats
4241 metadata_show(struct mddev *mddev, char *page)
4243 if (mddev->persistent)
4244 return sprintf(page, "%d.%d\n",
4245 mddev->major_version, mddev->minor_version);
4246 else if (mddev->external)
4247 return sprintf(page, "external:%s\n", mddev->metadata_type);
4249 return sprintf(page, "none\n");
4253 metadata_store(struct mddev *mddev, const char *buf, size_t len)
4258 /* Changing the details of 'external' metadata is
4259 * always permitted. Otherwise there must be
4260 * no devices attached to the array.
4263 err = mddev_lock(mddev);
4267 if (mddev->external && strncmp(buf, "external:", 9) == 0)
4269 else if (!list_empty(&mddev->disks))
4273 if (cmd_match(buf, "none")) {
4274 mddev->persistent = 0;
4275 mddev->external = 0;
4276 mddev->major_version = 0;
4277 mddev->minor_version = 90;
4280 if (strncmp(buf, "external:", 9) == 0) {
4281 size_t namelen = len-9;
4282 if (namelen >= sizeof(mddev->metadata_type))
4283 namelen = sizeof(mddev->metadata_type)-1;
4284 strncpy(mddev->metadata_type, buf+9, namelen);
4285 mddev->metadata_type[namelen] = 0;
4286 if (namelen && mddev->metadata_type[namelen-1] == '\n')
4287 mddev->metadata_type[--namelen] = 0;
4288 mddev->persistent = 0;
4289 mddev->external = 1;
4290 mddev->major_version = 0;
4291 mddev->minor_version = 90;
4294 major = simple_strtoul(buf, &e, 10);
4296 if (e==buf || *e != '.')
4299 minor = simple_strtoul(buf, &e, 10);
4300 if (e==buf || (*e && *e != '\n') )
4303 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
4305 mddev->major_version = major;
4306 mddev->minor_version = minor;
4307 mddev->persistent = 1;
4308 mddev->external = 0;
4311 mddev_unlock(mddev);
4315 static struct md_sysfs_entry md_metadata =
4316 __ATTR_PREALLOC(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
4319 action_show(struct mddev *mddev, char *page)
4321 char *type = "idle";
4322 unsigned long recovery = mddev->recovery;
4323 if (test_bit(MD_RECOVERY_FROZEN, &recovery))
4325 else if (test_bit(MD_RECOVERY_RUNNING, &recovery) ||
4326 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &recovery))) {
4327 if (test_bit(MD_RECOVERY_RESHAPE, &recovery))
4329 else if (test_bit(MD_RECOVERY_SYNC, &recovery)) {
4330 if (!test_bit(MD_RECOVERY_REQUESTED, &recovery))
4332 else if (test_bit(MD_RECOVERY_CHECK, &recovery))
4336 } else if (test_bit(MD_RECOVERY_RECOVER, &recovery))
4338 else if (mddev->reshape_position != MaxSector)
4341 return sprintf(page, "%s\n", type);
4345 action_store(struct mddev *mddev, const char *page, size_t len)
4347 if (!mddev->pers || !mddev->pers->sync_request)
4351 if (cmd_match(page, "idle") || cmd_match(page, "frozen")) {
4352 if (cmd_match(page, "frozen"))
4353 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4355 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4356 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
4357 mddev_lock(mddev) == 0) {
4358 flush_workqueue(md_misc_wq);
4359 if (mddev->sync_thread) {
4360 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4361 md_reap_sync_thread(mddev);
4363 mddev_unlock(mddev);
4365 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4367 else if (cmd_match(page, "resync"))
4368 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4369 else if (cmd_match(page, "recover")) {
4370 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4371 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
4372 } else if (cmd_match(page, "reshape")) {
4374 if (mddev->pers->start_reshape == NULL)
4376 err = mddev_lock(mddev);
4378 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4381 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4382 err = mddev->pers->start_reshape(mddev);
4384 mddev_unlock(mddev);
4388 sysfs_notify(&mddev->kobj, NULL, "degraded");
4390 if (cmd_match(page, "check"))
4391 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
4392 else if (!cmd_match(page, "repair"))
4394 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4395 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
4396 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
4398 if (mddev->ro == 2) {
4399 /* A write to sync_action is enough to justify
4400 * canceling read-auto mode
4403 md_wakeup_thread(mddev->sync_thread);
4405 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4406 md_wakeup_thread(mddev->thread);
4407 sysfs_notify_dirent_safe(mddev->sysfs_action);
4411 static struct md_sysfs_entry md_scan_mode =
4412 __ATTR_PREALLOC(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
4415 last_sync_action_show(struct mddev *mddev, char *page)
4417 return sprintf(page, "%s\n", mddev->last_sync_action);
4420 static struct md_sysfs_entry md_last_scan_mode = __ATTR_RO(last_sync_action);
4423 mismatch_cnt_show(struct mddev *mddev, char *page)
4425 return sprintf(page, "%llu\n",
4426 (unsigned long long)
4427 atomic64_read(&mddev->resync_mismatches));
4430 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
4433 sync_min_show(struct mddev *mddev, char *page)
4435 return sprintf(page, "%d (%s)\n", speed_min(mddev),
4436 mddev->sync_speed_min ? "local": "system");
4440 sync_min_store(struct mddev *mddev, const char *buf, size_t len)
4445 if (strncmp(buf, "system", 6)==0) {
4448 rv = kstrtouint(buf, 10, &min);
4454 mddev->sync_speed_min = min;
4458 static struct md_sysfs_entry md_sync_min =
4459 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
4462 sync_max_show(struct mddev *mddev, char *page)
4464 return sprintf(page, "%d (%s)\n", speed_max(mddev),
4465 mddev->sync_speed_max ? "local": "system");
4469 sync_max_store(struct mddev *mddev, const char *buf, size_t len)
4474 if (strncmp(buf, "system", 6)==0) {
4477 rv = kstrtouint(buf, 10, &max);
4483 mddev->sync_speed_max = max;
4487 static struct md_sysfs_entry md_sync_max =
4488 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
4491 degraded_show(struct mddev *mddev, char *page)
4493 return sprintf(page, "%d\n", mddev->degraded);
4495 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
4498 sync_force_parallel_show(struct mddev *mddev, char *page)
4500 return sprintf(page, "%d\n", mddev->parallel_resync);
4504 sync_force_parallel_store(struct mddev *mddev, const char *buf, size_t len)
4508 if (kstrtol(buf, 10, &n))
4511 if (n != 0 && n != 1)
4514 mddev->parallel_resync = n;
4516 if (mddev->sync_thread)
4517 wake_up(&resync_wait);
4522 /* force parallel resync, even with shared block devices */
4523 static struct md_sysfs_entry md_sync_force_parallel =
4524 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
4525 sync_force_parallel_show, sync_force_parallel_store);
4528 sync_speed_show(struct mddev *mddev, char *page)
4530 unsigned long resync, dt, db;
4531 if (mddev->curr_resync == 0)
4532 return sprintf(page, "none\n");
4533 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
4534 dt = (jiffies - mddev->resync_mark) / HZ;
4536 db = resync - mddev->resync_mark_cnt;
4537 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
4540 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
4543 sync_completed_show(struct mddev *mddev, char *page)
4545 unsigned long long max_sectors, resync;
4547 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4548 return sprintf(page, "none\n");
4550 if (mddev->curr_resync == 1 ||
4551 mddev->curr_resync == 2)
4552 return sprintf(page, "delayed\n");
4554 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
4555 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
4556 max_sectors = mddev->resync_max_sectors;
4558 max_sectors = mddev->dev_sectors;
4560 resync = mddev->curr_resync_completed;
4561 return sprintf(page, "%llu / %llu\n", resync, max_sectors);
4564 static struct md_sysfs_entry md_sync_completed =
4565 __ATTR_PREALLOC(sync_completed, S_IRUGO, sync_completed_show, NULL);
4568 min_sync_show(struct mddev *mddev, char *page)
4570 return sprintf(page, "%llu\n",
4571 (unsigned long long)mddev->resync_min);
4574 min_sync_store(struct mddev *mddev, const char *buf, size_t len)
4576 unsigned long long min;
4579 if (kstrtoull(buf, 10, &min))
4582 spin_lock(&mddev->lock);
4584 if (min > mddev->resync_max)
4588 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4591 /* Round down to multiple of 4K for safety */
4592 mddev->resync_min = round_down(min, 8);
4596 spin_unlock(&mddev->lock);
4600 static struct md_sysfs_entry md_min_sync =
4601 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
4604 max_sync_show(struct mddev *mddev, char *page)
4606 if (mddev->resync_max == MaxSector)
4607 return sprintf(page, "max\n");
4609 return sprintf(page, "%llu\n",
4610 (unsigned long long)mddev->resync_max);
4613 max_sync_store(struct mddev *mddev, const char *buf, size_t len)
4616 spin_lock(&mddev->lock);
4617 if (strncmp(buf, "max", 3) == 0)
4618 mddev->resync_max = MaxSector;
4620 unsigned long long max;
4624 if (kstrtoull(buf, 10, &max))
4626 if (max < mddev->resync_min)
4630 if (max < mddev->resync_max &&
4632 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4635 /* Must be a multiple of chunk_size */
4636 chunk = mddev->chunk_sectors;
4638 sector_t temp = max;
4641 if (sector_div(temp, chunk))
4644 mddev->resync_max = max;
4646 wake_up(&mddev->recovery_wait);
4649 spin_unlock(&mddev->lock);
4653 static struct md_sysfs_entry md_max_sync =
4654 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
4657 suspend_lo_show(struct mddev *mddev, char *page)
4659 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
4663 suspend_lo_store(struct mddev *mddev, const char *buf, size_t len)
4665 unsigned long long old, new;
4668 err = kstrtoull(buf, 10, &new);
4671 if (new != (sector_t)new)
4674 err = mddev_lock(mddev);
4678 if (mddev->pers == NULL ||
4679 mddev->pers->quiesce == NULL)
4681 old = mddev->suspend_lo;
4682 mddev->suspend_lo = new;
4684 /* Shrinking suspended region */
4685 mddev->pers->quiesce(mddev, 2);
4687 /* Expanding suspended region - need to wait */
4688 mddev->pers->quiesce(mddev, 1);
4689 mddev->pers->quiesce(mddev, 0);
4693 mddev_unlock(mddev);
4696 static struct md_sysfs_entry md_suspend_lo =
4697 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
4700 suspend_hi_show(struct mddev *mddev, char *page)
4702 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
4706 suspend_hi_store(struct mddev *mddev, const char *buf, size_t len)
4708 unsigned long long old, new;
4711 err = kstrtoull(buf, 10, &new);
4714 if (new != (sector_t)new)
4717 err = mddev_lock(mddev);
4721 if (mddev->pers == NULL ||
4722 mddev->pers->quiesce == NULL)
4724 old = mddev->suspend_hi;
4725 mddev->suspend_hi = new;
4727 /* Shrinking suspended region */
4728 mddev->pers->quiesce(mddev, 2);
4730 /* Expanding suspended region - need to wait */
4731 mddev->pers->quiesce(mddev, 1);
4732 mddev->pers->quiesce(mddev, 0);
4736 mddev_unlock(mddev);
4739 static struct md_sysfs_entry md_suspend_hi =
4740 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
4743 reshape_position_show(struct mddev *mddev, char *page)
4745 if (mddev->reshape_position != MaxSector)
4746 return sprintf(page, "%llu\n",
4747 (unsigned long long)mddev->reshape_position);
4748 strcpy(page, "none\n");
4753 reshape_position_store(struct mddev *mddev, const char *buf, size_t len)
4755 struct md_rdev *rdev;
4756 unsigned long long new;
4759 err = kstrtoull(buf, 10, &new);
4762 if (new != (sector_t)new)
4764 err = mddev_lock(mddev);
4770 mddev->reshape_position = new;
4771 mddev->delta_disks = 0;
4772 mddev->reshape_backwards = 0;
4773 mddev->new_level = mddev->level;
4774 mddev->new_layout = mddev->layout;
4775 mddev->new_chunk_sectors = mddev->chunk_sectors;
4776 rdev_for_each(rdev, mddev)
4777 rdev->new_data_offset = rdev->data_offset;
4780 mddev_unlock(mddev);
4784 static struct md_sysfs_entry md_reshape_position =
4785 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
4786 reshape_position_store);
4789 reshape_direction_show(struct mddev *mddev, char *page)
4791 return sprintf(page, "%s\n",
4792 mddev->reshape_backwards ? "backwards" : "forwards");
4796 reshape_direction_store(struct mddev *mddev, const char *buf, size_t len)
4801 if (cmd_match(buf, "forwards"))
4803 else if (cmd_match(buf, "backwards"))
4807 if (mddev->reshape_backwards == backwards)
4810 err = mddev_lock(mddev);
4813 /* check if we are allowed to change */
4814 if (mddev->delta_disks)
4816 else if (mddev->persistent &&
4817 mddev->major_version == 0)
4820 mddev->reshape_backwards = backwards;
4821 mddev_unlock(mddev);
4825 static struct md_sysfs_entry md_reshape_direction =
4826 __ATTR(reshape_direction, S_IRUGO|S_IWUSR, reshape_direction_show,
4827 reshape_direction_store);
4830 array_size_show(struct mddev *mddev, char *page)
4832 if (mddev->external_size)
4833 return sprintf(page, "%llu\n",
4834 (unsigned long long)mddev->array_sectors/2);
4836 return sprintf(page, "default\n");
4840 array_size_store(struct mddev *mddev, const char *buf, size_t len)
4845 err = mddev_lock(mddev);
4849 /* cluster raid doesn't support change array_sectors */
4850 if (mddev_is_clustered(mddev)) {
4851 mddev_unlock(mddev);
4855 if (strncmp(buf, "default", 7) == 0) {
4857 sectors = mddev->pers->size(mddev, 0, 0);
4859 sectors = mddev->array_sectors;
4861 mddev->external_size = 0;
4863 if (strict_blocks_to_sectors(buf, §ors) < 0)
4865 else if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors)
4868 mddev->external_size = 1;
4872 mddev->array_sectors = sectors;
4874 set_capacity(mddev->gendisk, mddev->array_sectors);
4875 revalidate_disk(mddev->gendisk);
4878 mddev_unlock(mddev);
4882 static struct md_sysfs_entry md_array_size =
4883 __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show,
4886 static struct attribute *md_default_attrs[] = {
4889 &md_raid_disks.attr,
4890 &md_chunk_size.attr,
4892 &md_resync_start.attr,
4894 &md_new_device.attr,
4895 &md_safe_delay.attr,
4896 &md_array_state.attr,
4897 &md_reshape_position.attr,
4898 &md_reshape_direction.attr,
4899 &md_array_size.attr,
4900 &max_corr_read_errors.attr,
4904 static struct attribute *md_redundancy_attrs[] = {
4906 &md_last_scan_mode.attr,
4907 &md_mismatches.attr,
4910 &md_sync_speed.attr,
4911 &md_sync_force_parallel.attr,
4912 &md_sync_completed.attr,
4915 &md_suspend_lo.attr,
4916 &md_suspend_hi.attr,
4921 static struct attribute_group md_redundancy_group = {
4923 .attrs = md_redundancy_attrs,
4927 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
4929 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
4930 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
4935 spin_lock(&all_mddevs_lock);
4936 if (list_empty(&mddev->all_mddevs)) {
4937 spin_unlock(&all_mddevs_lock);
4941 spin_unlock(&all_mddevs_lock);
4943 rv = entry->show(mddev, page);
4949 md_attr_store(struct kobject *kobj, struct attribute *attr,
4950 const char *page, size_t length)
4952 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
4953 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
4958 if (!capable(CAP_SYS_ADMIN))
4960 spin_lock(&all_mddevs_lock);
4961 if (list_empty(&mddev->all_mddevs)) {
4962 spin_unlock(&all_mddevs_lock);
4966 spin_unlock(&all_mddevs_lock);
4967 rv = entry->store(mddev, page, length);
4972 static void md_free(struct kobject *ko)
4974 struct mddev *mddev = container_of(ko, struct mddev, kobj);
4976 if (mddev->sysfs_state)
4977 sysfs_put(mddev->sysfs_state);
4980 blk_cleanup_queue(mddev->queue);
4981 if (mddev->gendisk) {
4982 del_gendisk(mddev->gendisk);
4983 put_disk(mddev->gendisk);
4989 static const struct sysfs_ops md_sysfs_ops = {
4990 .show = md_attr_show,
4991 .store = md_attr_store,
4993 static struct kobj_type md_ktype = {
4995 .sysfs_ops = &md_sysfs_ops,
4996 .default_attrs = md_default_attrs,
5001 static void mddev_delayed_delete(struct work_struct *ws)
5003 struct mddev *mddev = container_of(ws, struct mddev, del_work);
5005 sysfs_remove_group(&mddev->kobj, &md_bitmap_group);
5006 kobject_del(&mddev->kobj);
5007 kobject_put(&mddev->kobj);
5010 static int md_alloc(dev_t dev, char *name)
5012 static DEFINE_MUTEX(disks_mutex);
5013 struct mddev *mddev = mddev_find(dev);
5014 struct gendisk *disk;
5023 partitioned = (MAJOR(mddev->unit) != MD_MAJOR);
5024 shift = partitioned ? MdpMinorShift : 0;
5025 unit = MINOR(mddev->unit) >> shift;
5027 /* wait for any previous instance of this device to be
5028 * completely removed (mddev_delayed_delete).
5030 flush_workqueue(md_misc_wq);
5032 mutex_lock(&disks_mutex);
5038 /* Need to ensure that 'name' is not a duplicate.
5040 struct mddev *mddev2;
5041 spin_lock(&all_mddevs_lock);
5043 list_for_each_entry(mddev2, &all_mddevs, all_mddevs)
5044 if (mddev2->gendisk &&
5045 strcmp(mddev2->gendisk->disk_name, name) == 0) {
5046 spin_unlock(&all_mddevs_lock);
5049 spin_unlock(&all_mddevs_lock);
5053 mddev->queue = blk_alloc_queue(GFP_KERNEL);
5056 mddev->queue->queuedata = mddev;
5058 blk_queue_make_request(mddev->queue, md_make_request);
5059 blk_set_stacking_limits(&mddev->queue->limits);
5061 disk = alloc_disk(1 << shift);
5063 blk_cleanup_queue(mddev->queue);
5064 mddev->queue = NULL;
5067 disk->major = MAJOR(mddev->unit);
5068 disk->first_minor = unit << shift;
5070 strcpy(disk->disk_name, name);
5071 else if (partitioned)
5072 sprintf(disk->disk_name, "md_d%d", unit);
5074 sprintf(disk->disk_name, "md%d", unit);
5075 disk->fops = &md_fops;
5076 disk->private_data = mddev;
5077 disk->queue = mddev->queue;
5078 blk_queue_write_cache(mddev->queue, true, true);
5079 /* Allow extended partitions. This makes the
5080 * 'mdp' device redundant, but we can't really
5083 disk->flags |= GENHD_FL_EXT_DEVT;
5084 mddev->gendisk = disk;
5085 /* As soon as we call add_disk(), another thread could get
5086 * through to md_open, so make sure it doesn't get too far
5088 mutex_lock(&mddev->open_mutex);
5091 error = kobject_init_and_add(&mddev->kobj, &md_ktype,
5092 &disk_to_dev(disk)->kobj, "%s", "md");
5094 /* This isn't possible, but as kobject_init_and_add is marked
5095 * __must_check, we must do something with the result
5097 printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
5101 if (mddev->kobj.sd &&
5102 sysfs_create_group(&mddev->kobj, &md_bitmap_group))
5103 printk(KERN_DEBUG "pointless warning\n");
5104 mutex_unlock(&mddev->open_mutex);
5106 mutex_unlock(&disks_mutex);
5107 if (!error && mddev->kobj.sd) {
5108 kobject_uevent(&mddev->kobj, KOBJ_ADD);
5109 mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state");
5115 static struct kobject *md_probe(dev_t dev, int *part, void *data)
5117 md_alloc(dev, NULL);
5121 static int add_named_array(const char *val, struct kernel_param *kp)
5123 /* val must be "md_*" where * is not all digits.
5124 * We allocate an array with a large free minor number, and
5125 * set the name to val. val must not already be an active name.
5127 int len = strlen(val);
5128 char buf[DISK_NAME_LEN];
5130 while (len && val[len-1] == '\n')
5132 if (len >= DISK_NAME_LEN)
5134 strlcpy(buf, val, len+1);
5135 if (strncmp(buf, "md_", 3) != 0)
5137 return md_alloc(0, buf);
5140 static void md_safemode_timeout(unsigned long data)
5142 struct mddev *mddev = (struct mddev *) data;
5144 if (!atomic_read(&mddev->writes_pending)) {
5145 mddev->safemode = 1;
5146 if (mddev->external)
5147 sysfs_notify_dirent_safe(mddev->sysfs_state);
5149 md_wakeup_thread(mddev->thread);
5152 static int start_dirty_degraded;
5154 int md_run(struct mddev *mddev)
5157 struct md_rdev *rdev;
5158 struct md_personality *pers;
5160 if (list_empty(&mddev->disks))
5161 /* cannot run an array with no devices.. */
5166 /* Cannot run until previous stop completes properly */
5167 if (mddev->sysfs_active)
5171 * Analyze all RAID superblock(s)
5173 if (!mddev->raid_disks) {
5174 if (!mddev->persistent)
5179 if (mddev->level != LEVEL_NONE)
5180 request_module("md-level-%d", mddev->level);
5181 else if (mddev->clevel[0])
5182 request_module("md-%s", mddev->clevel);
5185 * Drop all container device buffers, from now on
5186 * the only valid external interface is through the md
5189 rdev_for_each(rdev, mddev) {
5190 if (test_bit(Faulty, &rdev->flags))
5192 sync_blockdev(rdev->bdev);
5193 invalidate_bdev(rdev->bdev);
5195 /* perform some consistency tests on the device.
5196 * We don't want the data to overlap the metadata,
5197 * Internal Bitmap issues have been handled elsewhere.
5199 if (rdev->meta_bdev) {
5200 /* Nothing to check */;
5201 } else if (rdev->data_offset < rdev->sb_start) {
5202 if (mddev->dev_sectors &&
5203 rdev->data_offset + mddev->dev_sectors
5205 printk("md: %s: data overlaps metadata\n",
5210 if (rdev->sb_start + rdev->sb_size/512
5211 > rdev->data_offset) {
5212 printk("md: %s: metadata overlaps data\n",
5217 sysfs_notify_dirent_safe(rdev->sysfs_state);
5220 if (mddev->bio_set == NULL)
5221 mddev->bio_set = bioset_create(BIO_POOL_SIZE, 0);
5223 spin_lock(&pers_lock);
5224 pers = find_pers(mddev->level, mddev->clevel);
5225 if (!pers || !try_module_get(pers->owner)) {
5226 spin_unlock(&pers_lock);
5227 if (mddev->level != LEVEL_NONE)
5228 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
5231 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
5235 spin_unlock(&pers_lock);
5236 if (mddev->level != pers->level) {
5237 mddev->level = pers->level;
5238 mddev->new_level = pers->level;
5240 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
5242 if (mddev->reshape_position != MaxSector &&
5243 pers->start_reshape == NULL) {
5244 /* This personality cannot handle reshaping... */
5245 module_put(pers->owner);
5249 if (pers->sync_request) {
5250 /* Warn if this is a potentially silly
5253 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
5254 struct md_rdev *rdev2;
5257 rdev_for_each(rdev, mddev)
5258 rdev_for_each(rdev2, mddev) {
5260 rdev->bdev->bd_contains ==
5261 rdev2->bdev->bd_contains) {
5263 "%s: WARNING: %s appears to be"
5264 " on the same physical disk as"
5267 bdevname(rdev->bdev,b),
5268 bdevname(rdev2->bdev,b2));
5275 "True protection against single-disk"
5276 " failure might be compromised.\n");
5279 mddev->recovery = 0;
5280 /* may be over-ridden by personality */
5281 mddev->resync_max_sectors = mddev->dev_sectors;
5283 mddev->ok_start_degraded = start_dirty_degraded;
5285 if (start_readonly && mddev->ro == 0)
5286 mddev->ro = 2; /* read-only, but switch on first write */
5288 err = pers->run(mddev);
5290 printk(KERN_ERR "md: pers->run() failed ...\n");
5291 else if (pers->size(mddev, 0, 0) < mddev->array_sectors) {
5292 WARN_ONCE(!mddev->external_size, "%s: default size too small,"
5293 " but 'external_size' not in effect?\n", __func__);
5295 "md: invalid array_size %llu > default size %llu\n",
5296 (unsigned long long)mddev->array_sectors / 2,
5297 (unsigned long long)pers->size(mddev, 0, 0) / 2);
5300 if (err == 0 && pers->sync_request &&
5301 (mddev->bitmap_info.file || mddev->bitmap_info.offset)) {
5302 struct bitmap *bitmap;
5304 bitmap = bitmap_create(mddev, -1);
5305 if (IS_ERR(bitmap)) {
5306 err = PTR_ERR(bitmap);
5307 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
5308 mdname(mddev), err);
5310 mddev->bitmap = bitmap;
5314 mddev_detach(mddev);
5316 pers->free(mddev, mddev->private);
5317 mddev->private = NULL;
5318 module_put(pers->owner);
5319 bitmap_destroy(mddev);
5325 rdev_for_each(rdev, mddev) {
5326 if (rdev->raid_disk >= 0 &&
5327 !blk_queue_nonrot(bdev_get_queue(rdev->bdev))) {
5332 if (mddev->degraded)
5335 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, mddev->queue);
5337 queue_flag_clear_unlocked(QUEUE_FLAG_NONROT, mddev->queue);
5338 mddev->queue->backing_dev_info.congested_data = mddev;
5339 mddev->queue->backing_dev_info.congested_fn = md_congested;
5341 if (pers->sync_request) {
5342 if (mddev->kobj.sd &&
5343 sysfs_create_group(&mddev->kobj, &md_redundancy_group))
5345 "md: cannot register extra attributes for %s\n",
5347 mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action");
5348 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
5351 atomic_set(&mddev->writes_pending,0);
5352 atomic_set(&mddev->max_corr_read_errors,
5353 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS);
5354 mddev->safemode = 0;
5355 if (mddev_is_clustered(mddev))
5356 mddev->safemode_delay = 0;
5358 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
5361 spin_lock(&mddev->lock);
5363 spin_unlock(&mddev->lock);
5364 rdev_for_each(rdev, mddev)
5365 if (rdev->raid_disk >= 0)
5366 if (sysfs_link_rdev(mddev, rdev))
5367 /* failure here is OK */;
5369 if (mddev->degraded && !mddev->ro)
5370 /* This ensures that recovering status is reported immediately
5371 * via sysfs - until a lack of spares is confirmed.
5373 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
5374 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5376 if (mddev->flags & MD_UPDATE_SB_FLAGS)
5377 md_update_sb(mddev, 0);
5379 md_new_event(mddev);
5380 sysfs_notify_dirent_safe(mddev->sysfs_state);
5381 sysfs_notify_dirent_safe(mddev->sysfs_action);
5382 sysfs_notify(&mddev->kobj, NULL, "degraded");
5385 EXPORT_SYMBOL_GPL(md_run);
5387 static int do_md_run(struct mddev *mddev)
5391 err = md_run(mddev);
5394 err = bitmap_load(mddev);
5396 bitmap_destroy(mddev);
5400 if (mddev_is_clustered(mddev))
5401 md_allow_write(mddev);
5403 md_wakeup_thread(mddev->thread);
5404 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
5406 set_capacity(mddev->gendisk, mddev->array_sectors);
5407 revalidate_disk(mddev->gendisk);
5409 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
5414 static int restart_array(struct mddev *mddev)
5416 struct gendisk *disk = mddev->gendisk;
5418 /* Complain if it has no devices */
5419 if (list_empty(&mddev->disks))
5425 if (test_bit(MD_HAS_JOURNAL, &mddev->flags)) {
5426 struct md_rdev *rdev;
5427 bool has_journal = false;
5430 rdev_for_each_rcu(rdev, mddev) {
5431 if (test_bit(Journal, &rdev->flags) &&
5432 !test_bit(Faulty, &rdev->flags)) {
5439 /* Don't restart rw with journal missing/faulty */
5444 mddev->safemode = 0;
5446 set_disk_ro(disk, 0);
5447 printk(KERN_INFO "md: %s switched to read-write mode.\n",
5449 /* Kick recovery or resync if necessary */
5450 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5451 md_wakeup_thread(mddev->thread);
5452 md_wakeup_thread(mddev->sync_thread);
5453 sysfs_notify_dirent_safe(mddev->sysfs_state);
5457 static void md_clean(struct mddev *mddev)
5459 mddev->array_sectors = 0;
5460 mddev->external_size = 0;
5461 mddev->dev_sectors = 0;
5462 mddev->raid_disks = 0;
5463 mddev->recovery_cp = 0;
5464 mddev->resync_min = 0;
5465 mddev->resync_max = MaxSector;
5466 mddev->reshape_position = MaxSector;
5467 mddev->external = 0;
5468 mddev->persistent = 0;
5469 mddev->level = LEVEL_NONE;
5470 mddev->clevel[0] = 0;
5473 mddev->metadata_type[0] = 0;
5474 mddev->chunk_sectors = 0;
5475 mddev->ctime = mddev->utime = 0;
5477 mddev->max_disks = 0;
5479 mddev->can_decrease_events = 0;
5480 mddev->delta_disks = 0;
5481 mddev->reshape_backwards = 0;
5482 mddev->new_level = LEVEL_NONE;
5483 mddev->new_layout = 0;
5484 mddev->new_chunk_sectors = 0;
5485 mddev->curr_resync = 0;
5486 atomic64_set(&mddev->resync_mismatches, 0);
5487 mddev->suspend_lo = mddev->suspend_hi = 0;
5488 mddev->sync_speed_min = mddev->sync_speed_max = 0;
5489 mddev->recovery = 0;
5492 mddev->degraded = 0;
5493 mddev->safemode = 0;
5494 mddev->private = NULL;
5495 mddev->cluster_info = NULL;
5496 mddev->bitmap_info.offset = 0;
5497 mddev->bitmap_info.default_offset = 0;
5498 mddev->bitmap_info.default_space = 0;
5499 mddev->bitmap_info.chunksize = 0;
5500 mddev->bitmap_info.daemon_sleep = 0;
5501 mddev->bitmap_info.max_write_behind = 0;
5502 mddev->bitmap_info.nodes = 0;
5505 static void __md_stop_writes(struct mddev *mddev)
5507 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5508 flush_workqueue(md_misc_wq);
5509 if (mddev->sync_thread) {
5510 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5511 md_reap_sync_thread(mddev);
5514 del_timer_sync(&mddev->safemode_timer);
5516 bitmap_flush(mddev);
5517 md_super_wait(mddev);
5519 if (mddev->ro == 0 &&
5520 ((!mddev->in_sync && !mddev_is_clustered(mddev)) ||
5521 (mddev->flags & MD_UPDATE_SB_FLAGS))) {
5522 /* mark array as shutdown cleanly */
5523 if (!mddev_is_clustered(mddev))
5525 md_update_sb(mddev, 1);
5529 void md_stop_writes(struct mddev *mddev)
5531 mddev_lock_nointr(mddev);
5532 __md_stop_writes(mddev);
5533 mddev_unlock(mddev);
5535 EXPORT_SYMBOL_GPL(md_stop_writes);
5537 static void mddev_detach(struct mddev *mddev)
5539 struct bitmap *bitmap = mddev->bitmap;
5540 /* wait for behind writes to complete */
5541 if (bitmap && atomic_read(&bitmap->behind_writes) > 0) {
5542 printk(KERN_INFO "md:%s: behind writes in progress - waiting to stop.\n",
5544 /* need to kick something here to make sure I/O goes? */
5545 wait_event(bitmap->behind_wait,
5546 atomic_read(&bitmap->behind_writes) == 0);
5548 if (mddev->pers && mddev->pers->quiesce) {
5549 mddev->pers->quiesce(mddev, 1);
5550 mddev->pers->quiesce(mddev, 0);
5552 md_unregister_thread(&mddev->thread);
5554 blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/
5557 static void __md_stop(struct mddev *mddev)
5559 struct md_personality *pers = mddev->pers;
5560 mddev_detach(mddev);
5561 /* Ensure ->event_work is done */
5562 flush_workqueue(md_misc_wq);
5563 spin_lock(&mddev->lock);
5565 spin_unlock(&mddev->lock);
5566 pers->free(mddev, mddev->private);
5567 mddev->private = NULL;
5568 if (pers->sync_request && mddev->to_remove == NULL)
5569 mddev->to_remove = &md_redundancy_group;
5570 module_put(pers->owner);
5571 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5574 void md_stop(struct mddev *mddev)
5576 /* stop the array and free an attached data structures.
5577 * This is called from dm-raid
5580 bitmap_destroy(mddev);
5582 bioset_free(mddev->bio_set);
5585 EXPORT_SYMBOL_GPL(md_stop);
5587 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev)
5592 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
5594 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5595 md_wakeup_thread(mddev->thread);
5597 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5598 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5599 if (mddev->sync_thread)
5600 /* Thread might be blocked waiting for metadata update
5601 * which will now never happen */
5602 wake_up_process(mddev->sync_thread->tsk);
5604 if (mddev->external && test_bit(MD_CHANGE_PENDING, &mddev->flags))
5606 mddev_unlock(mddev);
5607 wait_event(resync_wait, !test_bit(MD_RECOVERY_RUNNING,
5609 wait_event(mddev->sb_wait,
5610 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
5611 mddev_lock_nointr(mddev);
5613 mutex_lock(&mddev->open_mutex);
5614 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
5615 mddev->sync_thread ||
5616 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
5617 printk("md: %s still in use.\n",mdname(mddev));
5619 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5620 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5621 md_wakeup_thread(mddev->thread);
5627 __md_stop_writes(mddev);
5633 set_disk_ro(mddev->gendisk, 1);
5634 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5635 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5636 md_wakeup_thread(mddev->thread);
5637 sysfs_notify_dirent_safe(mddev->sysfs_state);
5641 mutex_unlock(&mddev->open_mutex);
5646 * 0 - completely stop and dis-assemble array
5647 * 2 - stop but do not disassemble array
5649 static int do_md_stop(struct mddev *mddev, int mode,
5650 struct block_device *bdev)
5652 struct gendisk *disk = mddev->gendisk;
5653 struct md_rdev *rdev;
5656 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
5658 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5659 md_wakeup_thread(mddev->thread);
5661 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5662 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5663 if (mddev->sync_thread)
5664 /* Thread might be blocked waiting for metadata update
5665 * which will now never happen */
5666 wake_up_process(mddev->sync_thread->tsk);
5668 mddev_unlock(mddev);
5669 wait_event(resync_wait, (mddev->sync_thread == NULL &&
5670 !test_bit(MD_RECOVERY_RUNNING,
5671 &mddev->recovery)));
5672 mddev_lock_nointr(mddev);
5674 mutex_lock(&mddev->open_mutex);
5675 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
5676 mddev->sysfs_active ||
5677 mddev->sync_thread ||
5678 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
5679 printk("md: %s still in use.\n",mdname(mddev));
5680 mutex_unlock(&mddev->open_mutex);
5682 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5683 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5684 md_wakeup_thread(mddev->thread);
5690 set_disk_ro(disk, 0);
5692 __md_stop_writes(mddev);
5694 mddev->queue->backing_dev_info.congested_fn = NULL;
5696 /* tell userspace to handle 'inactive' */
5697 sysfs_notify_dirent_safe(mddev->sysfs_state);
5699 rdev_for_each(rdev, mddev)
5700 if (rdev->raid_disk >= 0)
5701 sysfs_unlink_rdev(mddev, rdev);
5703 set_capacity(disk, 0);
5704 mutex_unlock(&mddev->open_mutex);
5706 revalidate_disk(disk);
5711 mutex_unlock(&mddev->open_mutex);
5713 * Free resources if final stop
5716 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
5718 bitmap_destroy(mddev);
5719 if (mddev->bitmap_info.file) {
5720 struct file *f = mddev->bitmap_info.file;
5721 spin_lock(&mddev->lock);
5722 mddev->bitmap_info.file = NULL;
5723 spin_unlock(&mddev->lock);
5726 mddev->bitmap_info.offset = 0;
5728 export_array(mddev);
5731 if (mddev->hold_active == UNTIL_STOP)
5732 mddev->hold_active = 0;
5734 md_new_event(mddev);
5735 sysfs_notify_dirent_safe(mddev->sysfs_state);
5740 static void autorun_array(struct mddev *mddev)
5742 struct md_rdev *rdev;
5745 if (list_empty(&mddev->disks))
5748 printk(KERN_INFO "md: running: ");
5750 rdev_for_each(rdev, mddev) {
5751 char b[BDEVNAME_SIZE];
5752 printk("<%s>", bdevname(rdev->bdev,b));
5756 err = do_md_run(mddev);
5758 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
5759 do_md_stop(mddev, 0, NULL);
5764 * lets try to run arrays based on all disks that have arrived
5765 * until now. (those are in pending_raid_disks)
5767 * the method: pick the first pending disk, collect all disks with
5768 * the same UUID, remove all from the pending list and put them into
5769 * the 'same_array' list. Then order this list based on superblock
5770 * update time (freshest comes first), kick out 'old' disks and
5771 * compare superblocks. If everything's fine then run it.
5773 * If "unit" is allocated, then bump its reference count
5775 static void autorun_devices(int part)
5777 struct md_rdev *rdev0, *rdev, *tmp;
5778 struct mddev *mddev;
5779 char b[BDEVNAME_SIZE];
5781 printk(KERN_INFO "md: autorun ...\n");
5782 while (!list_empty(&pending_raid_disks)) {
5785 LIST_HEAD(candidates);
5786 rdev0 = list_entry(pending_raid_disks.next,
5787 struct md_rdev, same_set);
5789 printk(KERN_INFO "md: considering %s ...\n",
5790 bdevname(rdev0->bdev,b));
5791 INIT_LIST_HEAD(&candidates);
5792 rdev_for_each_list(rdev, tmp, &pending_raid_disks)
5793 if (super_90_load(rdev, rdev0, 0) >= 0) {
5794 printk(KERN_INFO "md: adding %s ...\n",
5795 bdevname(rdev->bdev,b));
5796 list_move(&rdev->same_set, &candidates);
5799 * now we have a set of devices, with all of them having
5800 * mostly sane superblocks. It's time to allocate the
5804 dev = MKDEV(mdp_major,
5805 rdev0->preferred_minor << MdpMinorShift);
5806 unit = MINOR(dev) >> MdpMinorShift;
5808 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
5811 if (rdev0->preferred_minor != unit) {
5812 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
5813 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
5817 md_probe(dev, NULL, NULL);
5818 mddev = mddev_find(dev);
5819 if (!mddev || !mddev->gendisk) {
5823 "md: cannot allocate memory for md drive.\n");
5826 if (mddev_lock(mddev))
5827 printk(KERN_WARNING "md: %s locked, cannot run\n",
5829 else if (mddev->raid_disks || mddev->major_version
5830 || !list_empty(&mddev->disks)) {
5832 "md: %s already running, cannot run %s\n",
5833 mdname(mddev), bdevname(rdev0->bdev,b));
5834 mddev_unlock(mddev);
5836 printk(KERN_INFO "md: created %s\n", mdname(mddev));
5837 mddev->persistent = 1;
5838 rdev_for_each_list(rdev, tmp, &candidates) {
5839 list_del_init(&rdev->same_set);
5840 if (bind_rdev_to_array(rdev, mddev))
5843 autorun_array(mddev);
5844 mddev_unlock(mddev);
5846 /* on success, candidates will be empty, on error
5849 rdev_for_each_list(rdev, tmp, &candidates) {
5850 list_del_init(&rdev->same_set);
5855 printk(KERN_INFO "md: ... autorun DONE.\n");
5857 #endif /* !MODULE */
5859 static int get_version(void __user *arg)
5863 ver.major = MD_MAJOR_VERSION;
5864 ver.minor = MD_MINOR_VERSION;
5865 ver.patchlevel = MD_PATCHLEVEL_VERSION;
5867 if (copy_to_user(arg, &ver, sizeof(ver)))
5873 static int get_array_info(struct mddev *mddev, void __user *arg)
5875 mdu_array_info_t info;
5876 int nr,working,insync,failed,spare;
5877 struct md_rdev *rdev;
5879 nr = working = insync = failed = spare = 0;
5881 rdev_for_each_rcu(rdev, mddev) {
5883 if (test_bit(Faulty, &rdev->flags))
5887 if (test_bit(In_sync, &rdev->flags))
5889 else if (test_bit(Journal, &rdev->flags))
5890 /* TODO: add journal count to md_u.h */
5898 info.major_version = mddev->major_version;
5899 info.minor_version = mddev->minor_version;
5900 info.patch_version = MD_PATCHLEVEL_VERSION;
5901 info.ctime = clamp_t(time64_t, mddev->ctime, 0, U32_MAX);
5902 info.level = mddev->level;
5903 info.size = mddev->dev_sectors / 2;
5904 if (info.size != mddev->dev_sectors / 2) /* overflow */
5907 info.raid_disks = mddev->raid_disks;
5908 info.md_minor = mddev->md_minor;
5909 info.not_persistent= !mddev->persistent;
5911 info.utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX);
5914 info.state = (1<<MD_SB_CLEAN);
5915 if (mddev->bitmap && mddev->bitmap_info.offset)
5916 info.state |= (1<<MD_SB_BITMAP_PRESENT);
5917 if (mddev_is_clustered(mddev))
5918 info.state |= (1<<MD_SB_CLUSTERED);
5919 info.active_disks = insync;
5920 info.working_disks = working;
5921 info.failed_disks = failed;
5922 info.spare_disks = spare;
5924 info.layout = mddev->layout;
5925 info.chunk_size = mddev->chunk_sectors << 9;
5927 if (copy_to_user(arg, &info, sizeof(info)))
5933 static int get_bitmap_file(struct mddev *mddev, void __user * arg)
5935 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
5939 file = kzalloc(sizeof(*file), GFP_NOIO);
5944 spin_lock(&mddev->lock);
5945 /* bitmap enabled */
5946 if (mddev->bitmap_info.file) {
5947 ptr = file_path(mddev->bitmap_info.file, file->pathname,
5948 sizeof(file->pathname));
5952 memmove(file->pathname, ptr,
5953 sizeof(file->pathname)-(ptr-file->pathname));
5955 spin_unlock(&mddev->lock);
5958 copy_to_user(arg, file, sizeof(*file)))
5965 static int get_disk_info(struct mddev *mddev, void __user * arg)
5967 mdu_disk_info_t info;
5968 struct md_rdev *rdev;
5970 if (copy_from_user(&info, arg, sizeof(info)))
5974 rdev = md_find_rdev_nr_rcu(mddev, info.number);
5976 info.major = MAJOR(rdev->bdev->bd_dev);
5977 info.minor = MINOR(rdev->bdev->bd_dev);
5978 info.raid_disk = rdev->raid_disk;
5980 if (test_bit(Faulty, &rdev->flags))
5981 info.state |= (1<<MD_DISK_FAULTY);
5982 else if (test_bit(In_sync, &rdev->flags)) {
5983 info.state |= (1<<MD_DISK_ACTIVE);
5984 info.state |= (1<<MD_DISK_SYNC);
5986 if (test_bit(Journal, &rdev->flags))
5987 info.state |= (1<<MD_DISK_JOURNAL);
5988 if (test_bit(WriteMostly, &rdev->flags))
5989 info.state |= (1<<MD_DISK_WRITEMOSTLY);
5991 info.major = info.minor = 0;
5992 info.raid_disk = -1;
5993 info.state = (1<<MD_DISK_REMOVED);
5997 if (copy_to_user(arg, &info, sizeof(info)))
6003 static int add_new_disk(struct mddev *mddev, mdu_disk_info_t *info)
6005 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
6006 struct md_rdev *rdev;
6007 dev_t dev = MKDEV(info->major,info->minor);
6009 if (mddev_is_clustered(mddev) &&
6010 !(info->state & ((1 << MD_DISK_CLUSTER_ADD) | (1 << MD_DISK_CANDIDATE)))) {
6011 pr_err("%s: Cannot add to clustered mddev.\n",
6016 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
6019 if (!mddev->raid_disks) {
6021 /* expecting a device which has a superblock */
6022 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
6025 "md: md_import_device returned %ld\n",
6027 return PTR_ERR(rdev);
6029 if (!list_empty(&mddev->disks)) {
6030 struct md_rdev *rdev0
6031 = list_entry(mddev->disks.next,
6032 struct md_rdev, same_set);
6033 err = super_types[mddev->major_version]
6034 .load_super(rdev, rdev0, mddev->minor_version);
6037 "md: %s has different UUID to %s\n",
6038 bdevname(rdev->bdev,b),
6039 bdevname(rdev0->bdev,b2));
6044 err = bind_rdev_to_array(rdev, mddev);
6051 * add_new_disk can be used once the array is assembled
6052 * to add "hot spares". They must already have a superblock
6057 if (!mddev->pers->hot_add_disk) {
6059 "%s: personality does not support diskops!\n",
6063 if (mddev->persistent)
6064 rdev = md_import_device(dev, mddev->major_version,
6065 mddev->minor_version);
6067 rdev = md_import_device(dev, -1, -1);
6070 "md: md_import_device returned %ld\n",
6072 return PTR_ERR(rdev);
6074 /* set saved_raid_disk if appropriate */
6075 if (!mddev->persistent) {
6076 if (info->state & (1<<MD_DISK_SYNC) &&
6077 info->raid_disk < mddev->raid_disks) {
6078 rdev->raid_disk = info->raid_disk;
6079 set_bit(In_sync, &rdev->flags);
6080 clear_bit(Bitmap_sync, &rdev->flags);
6082 rdev->raid_disk = -1;
6083 rdev->saved_raid_disk = rdev->raid_disk;
6085 super_types[mddev->major_version].
6086 validate_super(mddev, rdev);
6087 if ((info->state & (1<<MD_DISK_SYNC)) &&
6088 rdev->raid_disk != info->raid_disk) {
6089 /* This was a hot-add request, but events doesn't
6090 * match, so reject it.
6096 clear_bit(In_sync, &rdev->flags); /* just to be sure */
6097 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
6098 set_bit(WriteMostly, &rdev->flags);
6100 clear_bit(WriteMostly, &rdev->flags);
6102 if (info->state & (1<<MD_DISK_JOURNAL)) {
6103 struct md_rdev *rdev2;
6104 bool has_journal = false;
6106 /* make sure no existing journal disk */
6107 rdev_for_each(rdev2, mddev) {
6108 if (test_bit(Journal, &rdev2->flags)) {
6117 set_bit(Journal, &rdev->flags);
6120 * check whether the device shows up in other nodes
6122 if (mddev_is_clustered(mddev)) {
6123 if (info->state & (1 << MD_DISK_CANDIDATE))
6124 set_bit(Candidate, &rdev->flags);
6125 else if (info->state & (1 << MD_DISK_CLUSTER_ADD)) {
6126 /* --add initiated by this node */
6127 err = md_cluster_ops->add_new_disk(mddev, rdev);
6135 rdev->raid_disk = -1;
6136 err = bind_rdev_to_array(rdev, mddev);
6141 if (mddev_is_clustered(mddev)) {
6142 if (info->state & (1 << MD_DISK_CANDIDATE)) {
6144 err = md_cluster_ops->new_disk_ack(mddev,
6147 md_kick_rdev_from_array(rdev);
6151 md_cluster_ops->add_new_disk_cancel(mddev);
6153 err = add_bound_rdev(rdev);
6157 err = add_bound_rdev(rdev);
6162 /* otherwise, add_new_disk is only allowed
6163 * for major_version==0 superblocks
6165 if (mddev->major_version != 0) {
6166 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
6171 if (!(info->state & (1<<MD_DISK_FAULTY))) {
6173 rdev = md_import_device(dev, -1, 0);
6176 "md: error, md_import_device() returned %ld\n",
6178 return PTR_ERR(rdev);
6180 rdev->desc_nr = info->number;
6181 if (info->raid_disk < mddev->raid_disks)
6182 rdev->raid_disk = info->raid_disk;
6184 rdev->raid_disk = -1;
6186 if (rdev->raid_disk < mddev->raid_disks)
6187 if (info->state & (1<<MD_DISK_SYNC))
6188 set_bit(In_sync, &rdev->flags);
6190 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
6191 set_bit(WriteMostly, &rdev->flags);
6193 if (!mddev->persistent) {
6194 printk(KERN_INFO "md: nonpersistent superblock ...\n");
6195 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
6197 rdev->sb_start = calc_dev_sboffset(rdev);
6198 rdev->sectors = rdev->sb_start;
6200 err = bind_rdev_to_array(rdev, mddev);
6210 static int hot_remove_disk(struct mddev *mddev, dev_t dev)
6212 char b[BDEVNAME_SIZE];
6213 struct md_rdev *rdev;
6218 rdev = find_rdev(mddev, dev);
6222 if (rdev->raid_disk < 0)
6225 clear_bit(Blocked, &rdev->flags);
6226 remove_and_add_spares(mddev, rdev);
6228 if (rdev->raid_disk >= 0)
6232 if (mddev_is_clustered(mddev))
6233 md_cluster_ops->remove_disk(mddev, rdev);
6235 md_kick_rdev_from_array(rdev);
6236 md_update_sb(mddev, 1);
6237 md_new_event(mddev);
6241 printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n",
6242 bdevname(rdev->bdev,b), mdname(mddev));
6246 static int hot_add_disk(struct mddev *mddev, dev_t dev)
6248 char b[BDEVNAME_SIZE];
6250 struct md_rdev *rdev;
6255 if (mddev->major_version != 0) {
6256 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
6257 " version-0 superblocks.\n",
6261 if (!mddev->pers->hot_add_disk) {
6263 "%s: personality does not support diskops!\n",
6268 rdev = md_import_device(dev, -1, 0);
6271 "md: error, md_import_device() returned %ld\n",
6276 if (mddev->persistent)
6277 rdev->sb_start = calc_dev_sboffset(rdev);
6279 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
6281 rdev->sectors = rdev->sb_start;
6283 if (test_bit(Faulty, &rdev->flags)) {
6285 "md: can not hot-add faulty %s disk to %s!\n",
6286 bdevname(rdev->bdev,b), mdname(mddev));
6291 clear_bit(In_sync, &rdev->flags);
6293 rdev->saved_raid_disk = -1;
6294 err = bind_rdev_to_array(rdev, mddev);
6299 * The rest should better be atomic, we can have disk failures
6300 * noticed in interrupt contexts ...
6303 rdev->raid_disk = -1;
6305 md_update_sb(mddev, 1);
6307 * Kick recovery, maybe this spare has to be added to the
6308 * array immediately.
6310 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6311 md_wakeup_thread(mddev->thread);
6312 md_new_event(mddev);
6320 static int set_bitmap_file(struct mddev *mddev, int fd)
6325 if (!mddev->pers->quiesce || !mddev->thread)
6327 if (mddev->recovery || mddev->sync_thread)
6329 /* we should be able to change the bitmap.. */
6333 struct inode *inode;
6336 if (mddev->bitmap || mddev->bitmap_info.file)
6337 return -EEXIST; /* cannot add when bitmap is present */
6341 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
6346 inode = f->f_mapping->host;
6347 if (!S_ISREG(inode->i_mode)) {
6348 printk(KERN_ERR "%s: error: bitmap file must be a regular file\n",
6351 } else if (!(f->f_mode & FMODE_WRITE)) {
6352 printk(KERN_ERR "%s: error: bitmap file must open for write\n",
6355 } else if (atomic_read(&inode->i_writecount) != 1) {
6356 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
6364 mddev->bitmap_info.file = f;
6365 mddev->bitmap_info.offset = 0; /* file overrides offset */
6366 } else if (mddev->bitmap == NULL)
6367 return -ENOENT; /* cannot remove what isn't there */
6370 mddev->pers->quiesce(mddev, 1);
6372 struct bitmap *bitmap;
6374 bitmap = bitmap_create(mddev, -1);
6375 if (!IS_ERR(bitmap)) {
6376 mddev->bitmap = bitmap;
6377 err = bitmap_load(mddev);
6379 err = PTR_ERR(bitmap);
6381 if (fd < 0 || err) {
6382 bitmap_destroy(mddev);
6383 fd = -1; /* make sure to put the file */
6385 mddev->pers->quiesce(mddev, 0);
6388 struct file *f = mddev->bitmap_info.file;
6390 spin_lock(&mddev->lock);
6391 mddev->bitmap_info.file = NULL;
6392 spin_unlock(&mddev->lock);
6401 * set_array_info is used two different ways
6402 * The original usage is when creating a new array.
6403 * In this usage, raid_disks is > 0 and it together with
6404 * level, size, not_persistent,layout,chunksize determine the
6405 * shape of the array.
6406 * This will always create an array with a type-0.90.0 superblock.
6407 * The newer usage is when assembling an array.
6408 * In this case raid_disks will be 0, and the major_version field is
6409 * use to determine which style super-blocks are to be found on the devices.
6410 * The minor and patch _version numbers are also kept incase the
6411 * super_block handler wishes to interpret them.
6413 static int set_array_info(struct mddev *mddev, mdu_array_info_t *info)
6416 if (info->raid_disks == 0) {
6417 /* just setting version number for superblock loading */
6418 if (info->major_version < 0 ||
6419 info->major_version >= ARRAY_SIZE(super_types) ||
6420 super_types[info->major_version].name == NULL) {
6421 /* maybe try to auto-load a module? */
6423 "md: superblock version %d not known\n",
6424 info->major_version);
6427 mddev->major_version = info->major_version;
6428 mddev->minor_version = info->minor_version;
6429 mddev->patch_version = info->patch_version;
6430 mddev->persistent = !info->not_persistent;
6431 /* ensure mddev_put doesn't delete this now that there
6432 * is some minimal configuration.
6434 mddev->ctime = ktime_get_real_seconds();
6437 mddev->major_version = MD_MAJOR_VERSION;
6438 mddev->minor_version = MD_MINOR_VERSION;
6439 mddev->patch_version = MD_PATCHLEVEL_VERSION;
6440 mddev->ctime = ktime_get_real_seconds();
6442 mddev->level = info->level;
6443 mddev->clevel[0] = 0;
6444 mddev->dev_sectors = 2 * (sector_t)info->size;
6445 mddev->raid_disks = info->raid_disks;
6446 /* don't set md_minor, it is determined by which /dev/md* was
6449 if (info->state & (1<<MD_SB_CLEAN))
6450 mddev->recovery_cp = MaxSector;
6452 mddev->recovery_cp = 0;
6453 mddev->persistent = ! info->not_persistent;
6454 mddev->external = 0;
6456 mddev->layout = info->layout;
6457 mddev->chunk_sectors = info->chunk_size >> 9;
6459 mddev->max_disks = MD_SB_DISKS;
6461 if (mddev->persistent)
6463 set_bit(MD_CHANGE_DEVS, &mddev->flags);
6465 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
6466 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
6467 mddev->bitmap_info.offset = 0;
6469 mddev->reshape_position = MaxSector;
6472 * Generate a 128 bit UUID
6474 get_random_bytes(mddev->uuid, 16);
6476 mddev->new_level = mddev->level;
6477 mddev->new_chunk_sectors = mddev->chunk_sectors;
6478 mddev->new_layout = mddev->layout;
6479 mddev->delta_disks = 0;
6480 mddev->reshape_backwards = 0;
6485 void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors)
6487 WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__);
6489 if (mddev->external_size)
6492 mddev->array_sectors = array_sectors;
6494 EXPORT_SYMBOL(md_set_array_sectors);
6496 static int update_size(struct mddev *mddev, sector_t num_sectors)
6498 struct md_rdev *rdev;
6500 int fit = (num_sectors == 0);
6502 /* cluster raid doesn't support update size */
6503 if (mddev_is_clustered(mddev))
6506 if (mddev->pers->resize == NULL)
6508 /* The "num_sectors" is the number of sectors of each device that
6509 * is used. This can only make sense for arrays with redundancy.
6510 * linear and raid0 always use whatever space is available. We can only
6511 * consider changing this number if no resync or reconstruction is
6512 * happening, and if the new size is acceptable. It must fit before the
6513 * sb_start or, if that is <data_offset, it must fit before the size
6514 * of each device. If num_sectors is zero, we find the largest size
6517 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
6523 rdev_for_each(rdev, mddev) {
6524 sector_t avail = rdev->sectors;
6526 if (fit && (num_sectors == 0 || num_sectors > avail))
6527 num_sectors = avail;
6528 if (avail < num_sectors)
6531 rv = mddev->pers->resize(mddev, num_sectors);
6533 revalidate_disk(mddev->gendisk);
6537 static int update_raid_disks(struct mddev *mddev, int raid_disks)
6540 struct md_rdev *rdev;
6541 /* change the number of raid disks */
6542 if (mddev->pers->check_reshape == NULL)
6546 if (raid_disks <= 0 ||
6547 (mddev->max_disks && raid_disks >= mddev->max_disks))
6549 if (mddev->sync_thread ||
6550 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
6551 mddev->reshape_position != MaxSector)
6554 rdev_for_each(rdev, mddev) {
6555 if (mddev->raid_disks < raid_disks &&
6556 rdev->data_offset < rdev->new_data_offset)
6558 if (mddev->raid_disks > raid_disks &&
6559 rdev->data_offset > rdev->new_data_offset)
6563 mddev->delta_disks = raid_disks - mddev->raid_disks;
6564 if (mddev->delta_disks < 0)
6565 mddev->reshape_backwards = 1;
6566 else if (mddev->delta_disks > 0)
6567 mddev->reshape_backwards = 0;
6569 rv = mddev->pers->check_reshape(mddev);
6571 mddev->delta_disks = 0;
6572 mddev->reshape_backwards = 0;
6578 * update_array_info is used to change the configuration of an
6580 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
6581 * fields in the info are checked against the array.
6582 * Any differences that cannot be handled will cause an error.
6583 * Normally, only one change can be managed at a time.
6585 static int update_array_info(struct mddev *mddev, mdu_array_info_t *info)
6591 /* calculate expected state,ignoring low bits */
6592 if (mddev->bitmap && mddev->bitmap_info.offset)
6593 state |= (1 << MD_SB_BITMAP_PRESENT);
6595 if (mddev->major_version != info->major_version ||
6596 mddev->minor_version != info->minor_version ||
6597 /* mddev->patch_version != info->patch_version || */
6598 mddev->ctime != info->ctime ||
6599 mddev->level != info->level ||
6600 /* mddev->layout != info->layout || */
6601 mddev->persistent != !info->not_persistent ||
6602 mddev->chunk_sectors != info->chunk_size >> 9 ||
6603 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
6604 ((state^info->state) & 0xfffffe00)
6607 /* Check there is only one change */
6608 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
6610 if (mddev->raid_disks != info->raid_disks)
6612 if (mddev->layout != info->layout)
6614 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT))
6621 if (mddev->layout != info->layout) {
6623 * we don't need to do anything at the md level, the
6624 * personality will take care of it all.
6626 if (mddev->pers->check_reshape == NULL)
6629 mddev->new_layout = info->layout;
6630 rv = mddev->pers->check_reshape(mddev);
6632 mddev->new_layout = mddev->layout;
6636 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
6637 rv = update_size(mddev, (sector_t)info->size * 2);
6639 if (mddev->raid_disks != info->raid_disks)
6640 rv = update_raid_disks(mddev, info->raid_disks);
6642 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
6643 if (mddev->pers->quiesce == NULL || mddev->thread == NULL) {
6647 if (mddev->recovery || mddev->sync_thread) {
6651 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
6652 struct bitmap *bitmap;
6653 /* add the bitmap */
6654 if (mddev->bitmap) {
6658 if (mddev->bitmap_info.default_offset == 0) {
6662 mddev->bitmap_info.offset =
6663 mddev->bitmap_info.default_offset;
6664 mddev->bitmap_info.space =
6665 mddev->bitmap_info.default_space;
6666 mddev->pers->quiesce(mddev, 1);
6667 bitmap = bitmap_create(mddev, -1);
6668 if (!IS_ERR(bitmap)) {
6669 mddev->bitmap = bitmap;
6670 rv = bitmap_load(mddev);
6672 rv = PTR_ERR(bitmap);
6674 bitmap_destroy(mddev);
6675 mddev->pers->quiesce(mddev, 0);
6677 /* remove the bitmap */
6678 if (!mddev->bitmap) {
6682 if (mddev->bitmap->storage.file) {
6686 if (mddev->bitmap_info.nodes) {
6687 /* hold PW on all the bitmap lock */
6688 if (md_cluster_ops->lock_all_bitmaps(mddev) <= 0) {
6689 printk("md: can't change bitmap to none since the"
6690 " array is in use by more than one node\n");
6692 md_cluster_ops->unlock_all_bitmaps(mddev);
6696 mddev->bitmap_info.nodes = 0;
6697 md_cluster_ops->leave(mddev);
6699 mddev->pers->quiesce(mddev, 1);
6700 bitmap_destroy(mddev);
6701 mddev->pers->quiesce(mddev, 0);
6702 mddev->bitmap_info.offset = 0;
6705 md_update_sb(mddev, 1);
6711 static int set_disk_faulty(struct mddev *mddev, dev_t dev)
6713 struct md_rdev *rdev;
6716 if (mddev->pers == NULL)
6720 rdev = find_rdev_rcu(mddev, dev);
6724 md_error(mddev, rdev);
6725 if (!test_bit(Faulty, &rdev->flags))
6733 * We have a problem here : there is no easy way to give a CHS
6734 * virtual geometry. We currently pretend that we have a 2 heads
6735 * 4 sectors (with a BIG number of cylinders...). This drives
6736 * dosfs just mad... ;-)
6738 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
6740 struct mddev *mddev = bdev->bd_disk->private_data;
6744 geo->cylinders = mddev->array_sectors / 8;
6748 static inline bool md_ioctl_valid(unsigned int cmd)
6753 case GET_ARRAY_INFO:
6754 case GET_BITMAP_FILE:
6757 case HOT_REMOVE_DISK:
6760 case RESTART_ARRAY_RW:
6762 case SET_ARRAY_INFO:
6763 case SET_BITMAP_FILE:
6764 case SET_DISK_FAULTY:
6767 case CLUSTERED_DISK_NACK:
6774 static int md_ioctl(struct block_device *bdev, fmode_t mode,
6775 unsigned int cmd, unsigned long arg)
6778 void __user *argp = (void __user *)arg;
6779 struct mddev *mddev = NULL;
6781 bool did_set_md_closing = false;
6783 if (!md_ioctl_valid(cmd))
6788 case GET_ARRAY_INFO:
6792 if (!capable(CAP_SYS_ADMIN))
6797 * Commands dealing with the RAID driver but not any
6802 err = get_version(argp);
6808 autostart_arrays(arg);
6815 * Commands creating/starting a new array:
6818 mddev = bdev->bd_disk->private_data;
6825 /* Some actions do not requires the mutex */
6827 case GET_ARRAY_INFO:
6828 if (!mddev->raid_disks && !mddev->external)
6831 err = get_array_info(mddev, argp);
6835 if (!mddev->raid_disks && !mddev->external)
6838 err = get_disk_info(mddev, argp);
6841 case SET_DISK_FAULTY:
6842 err = set_disk_faulty(mddev, new_decode_dev(arg));
6845 case GET_BITMAP_FILE:
6846 err = get_bitmap_file(mddev, argp);
6851 if (cmd == ADD_NEW_DISK)
6852 /* need to ensure md_delayed_delete() has completed */
6853 flush_workqueue(md_misc_wq);
6855 if (cmd == HOT_REMOVE_DISK)
6856 /* need to ensure recovery thread has run */
6857 wait_event_interruptible_timeout(mddev->sb_wait,
6858 !test_bit(MD_RECOVERY_NEEDED,
6860 msecs_to_jiffies(5000));
6861 if (cmd == STOP_ARRAY || cmd == STOP_ARRAY_RO) {
6862 /* Need to flush page cache, and ensure no-one else opens
6865 mutex_lock(&mddev->open_mutex);
6866 if (mddev->pers && atomic_read(&mddev->openers) > 1) {
6867 mutex_unlock(&mddev->open_mutex);
6871 if (test_and_set_bit(MD_CLOSING, &mddev->flags)) {
6872 mutex_unlock(&mddev->open_mutex);
6876 did_set_md_closing = true;
6877 mutex_unlock(&mddev->open_mutex);
6878 sync_blockdev(bdev);
6880 err = mddev_lock(mddev);
6883 "md: ioctl lock interrupted, reason %d, cmd %d\n",
6888 if (cmd == SET_ARRAY_INFO) {
6889 mdu_array_info_t info;
6891 memset(&info, 0, sizeof(info));
6892 else if (copy_from_user(&info, argp, sizeof(info))) {
6897 err = update_array_info(mddev, &info);
6899 printk(KERN_WARNING "md: couldn't update"
6900 " array info. %d\n", err);
6905 if (!list_empty(&mddev->disks)) {
6907 "md: array %s already has disks!\n",
6912 if (mddev->raid_disks) {
6914 "md: array %s already initialised!\n",
6919 err = set_array_info(mddev, &info);
6921 printk(KERN_WARNING "md: couldn't set"
6922 " array info. %d\n", err);
6929 * Commands querying/configuring an existing array:
6931 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
6932 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
6933 if ((!mddev->raid_disks && !mddev->external)
6934 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
6935 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
6936 && cmd != GET_BITMAP_FILE) {
6942 * Commands even a read-only array can execute:
6945 case RESTART_ARRAY_RW:
6946 err = restart_array(mddev);
6950 err = do_md_stop(mddev, 0, bdev);
6954 err = md_set_readonly(mddev, bdev);
6957 case HOT_REMOVE_DISK:
6958 err = hot_remove_disk(mddev, new_decode_dev(arg));
6962 /* We can support ADD_NEW_DISK on read-only arrays
6963 * only if we are re-adding a preexisting device.
6964 * So require mddev->pers and MD_DISK_SYNC.
6967 mdu_disk_info_t info;
6968 if (copy_from_user(&info, argp, sizeof(info)))
6970 else if (!(info.state & (1<<MD_DISK_SYNC)))
6971 /* Need to clear read-only for this */
6974 err = add_new_disk(mddev, &info);
6980 if (get_user(ro, (int __user *)(arg))) {
6986 /* if the bdev is going readonly the value of mddev->ro
6987 * does not matter, no writes are coming
6992 /* are we are already prepared for writes? */
6996 /* transitioning to readauto need only happen for
6997 * arrays that call md_write_start
7000 err = restart_array(mddev);
7003 set_disk_ro(mddev->gendisk, 0);
7010 * The remaining ioctls are changing the state of the
7011 * superblock, so we do not allow them on read-only arrays.
7013 if (mddev->ro && mddev->pers) {
7014 if (mddev->ro == 2) {
7016 sysfs_notify_dirent_safe(mddev->sysfs_state);
7017 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7018 /* mddev_unlock will wake thread */
7019 /* If a device failed while we were read-only, we
7020 * need to make sure the metadata is updated now.
7022 if (test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
7023 mddev_unlock(mddev);
7024 wait_event(mddev->sb_wait,
7025 !test_bit(MD_CHANGE_DEVS, &mddev->flags) &&
7026 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
7027 mddev_lock_nointr(mddev);
7038 mdu_disk_info_t info;
7039 if (copy_from_user(&info, argp, sizeof(info)))
7042 err = add_new_disk(mddev, &info);
7046 case CLUSTERED_DISK_NACK:
7047 if (mddev_is_clustered(mddev))
7048 md_cluster_ops->new_disk_ack(mddev, false);
7054 err = hot_add_disk(mddev, new_decode_dev(arg));
7058 err = do_md_run(mddev);
7061 case SET_BITMAP_FILE:
7062 err = set_bitmap_file(mddev, (int)arg);
7071 if (mddev->hold_active == UNTIL_IOCTL &&
7073 mddev->hold_active = 0;
7074 mddev_unlock(mddev);
7076 if(did_set_md_closing)
7077 clear_bit(MD_CLOSING, &mddev->flags);
7080 #ifdef CONFIG_COMPAT
7081 static int md_compat_ioctl(struct block_device *bdev, fmode_t mode,
7082 unsigned int cmd, unsigned long arg)
7085 case HOT_REMOVE_DISK:
7087 case SET_DISK_FAULTY:
7088 case SET_BITMAP_FILE:
7089 /* These take in integer arg, do not convert */
7092 arg = (unsigned long)compat_ptr(arg);
7096 return md_ioctl(bdev, mode, cmd, arg);
7098 #endif /* CONFIG_COMPAT */
7100 static int md_open(struct block_device *bdev, fmode_t mode)
7103 * Succeed if we can lock the mddev, which confirms that
7104 * it isn't being stopped right now.
7106 struct mddev *mddev = mddev_find(bdev->bd_dev);
7112 if (mddev->gendisk != bdev->bd_disk) {
7113 /* we are racing with mddev_put which is discarding this
7117 /* Wait until bdev->bd_disk is definitely gone */
7118 if (work_pending(&mddev->del_work))
7119 flush_workqueue(md_misc_wq);
7122 BUG_ON(mddev != bdev->bd_disk->private_data);
7124 if ((err = mutex_lock_interruptible(&mddev->open_mutex)))
7127 if (test_bit(MD_CLOSING, &mddev->flags)) {
7128 mutex_unlock(&mddev->open_mutex);
7134 atomic_inc(&mddev->openers);
7135 mutex_unlock(&mddev->open_mutex);
7137 check_disk_change(bdev);
7144 static void md_release(struct gendisk *disk, fmode_t mode)
7146 struct mddev *mddev = disk->private_data;
7149 atomic_dec(&mddev->openers);
7153 static int md_media_changed(struct gendisk *disk)
7155 struct mddev *mddev = disk->private_data;
7157 return mddev->changed;
7160 static int md_revalidate(struct gendisk *disk)
7162 struct mddev *mddev = disk->private_data;
7167 static const struct block_device_operations md_fops =
7169 .owner = THIS_MODULE,
7171 .release = md_release,
7173 #ifdef CONFIG_COMPAT
7174 .compat_ioctl = md_compat_ioctl,
7176 .getgeo = md_getgeo,
7177 .media_changed = md_media_changed,
7178 .revalidate_disk= md_revalidate,
7181 static int md_thread(void *arg)
7183 struct md_thread *thread = arg;
7186 * md_thread is a 'system-thread', it's priority should be very
7187 * high. We avoid resource deadlocks individually in each
7188 * raid personality. (RAID5 does preallocation) We also use RR and
7189 * the very same RT priority as kswapd, thus we will never get
7190 * into a priority inversion deadlock.
7192 * we definitely have to have equal or higher priority than
7193 * bdflush, otherwise bdflush will deadlock if there are too
7194 * many dirty RAID5 blocks.
7197 allow_signal(SIGKILL);
7198 while (!kthread_should_stop()) {
7200 /* We need to wait INTERRUPTIBLE so that
7201 * we don't add to the load-average.
7202 * That means we need to be sure no signals are
7205 if (signal_pending(current))
7206 flush_signals(current);
7208 wait_event_interruptible_timeout
7210 test_bit(THREAD_WAKEUP, &thread->flags)
7211 || kthread_should_stop(),
7214 clear_bit(THREAD_WAKEUP, &thread->flags);
7215 if (!kthread_should_stop())
7216 thread->run(thread);
7222 void md_wakeup_thread(struct md_thread *thread)
7225 pr_debug("md: waking up MD thread %s.\n", thread->tsk->comm);
7226 set_bit(THREAD_WAKEUP, &thread->flags);
7227 wake_up(&thread->wqueue);
7230 EXPORT_SYMBOL(md_wakeup_thread);
7232 struct md_thread *md_register_thread(void (*run) (struct md_thread *),
7233 struct mddev *mddev, const char *name)
7235 struct md_thread *thread;
7237 thread = kzalloc(sizeof(struct md_thread), GFP_KERNEL);
7241 init_waitqueue_head(&thread->wqueue);
7244 thread->mddev = mddev;
7245 thread->timeout = MAX_SCHEDULE_TIMEOUT;
7246 thread->tsk = kthread_run(md_thread, thread,
7248 mdname(thread->mddev),
7250 if (IS_ERR(thread->tsk)) {
7256 EXPORT_SYMBOL(md_register_thread);
7258 void md_unregister_thread(struct md_thread **threadp)
7260 struct md_thread *thread;
7263 * Locking ensures that mddev_unlock does not wake_up a
7264 * non-existent thread
7266 spin_lock(&pers_lock);
7269 spin_unlock(&pers_lock);
7273 spin_unlock(&pers_lock);
7275 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
7276 kthread_stop(thread->tsk);
7279 EXPORT_SYMBOL(md_unregister_thread);
7281 void md_error(struct mddev *mddev, struct md_rdev *rdev)
7283 if (!rdev || test_bit(Faulty, &rdev->flags))
7286 if (!mddev->pers || !mddev->pers->error_handler)
7288 mddev->pers->error_handler(mddev,rdev);
7289 if (mddev->degraded)
7290 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7291 sysfs_notify_dirent_safe(rdev->sysfs_state);
7292 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7293 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7294 md_wakeup_thread(mddev->thread);
7295 if (mddev->event_work.func)
7296 queue_work(md_misc_wq, &mddev->event_work);
7297 md_new_event(mddev);
7299 EXPORT_SYMBOL(md_error);
7301 /* seq_file implementation /proc/mdstat */
7303 static void status_unused(struct seq_file *seq)
7306 struct md_rdev *rdev;
7308 seq_printf(seq, "unused devices: ");
7310 list_for_each_entry(rdev, &pending_raid_disks, same_set) {
7311 char b[BDEVNAME_SIZE];
7313 seq_printf(seq, "%s ",
7314 bdevname(rdev->bdev,b));
7317 seq_printf(seq, "<none>");
7319 seq_printf(seq, "\n");
7322 static int status_resync(struct seq_file *seq, struct mddev *mddev)
7324 sector_t max_sectors, resync, res;
7325 unsigned long dt, db = 0;
7326 sector_t rt, curr_mark_cnt, resync_mark_cnt;
7327 int scale, recovery_active;
7328 unsigned int per_milli;
7330 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
7331 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
7332 max_sectors = mddev->resync_max_sectors;
7334 max_sectors = mddev->dev_sectors;
7336 resync = mddev->curr_resync;
7338 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
7339 /* Still cleaning up */
7340 resync = max_sectors;
7342 resync -= atomic_read(&mddev->recovery_active);
7345 if (mddev->recovery_cp < MaxSector) {
7346 seq_printf(seq, "\tresync=PENDING");
7352 seq_printf(seq, "\tresync=DELAYED");
7356 WARN_ON(max_sectors == 0);
7357 /* Pick 'scale' such that (resync>>scale)*1000 will fit
7358 * in a sector_t, and (max_sectors>>scale) will fit in a
7359 * u32, as those are the requirements for sector_div.
7360 * Thus 'scale' must be at least 10
7363 if (sizeof(sector_t) > sizeof(unsigned long)) {
7364 while ( max_sectors/2 > (1ULL<<(scale+32)))
7367 res = (resync>>scale)*1000;
7368 sector_div(res, (u32)((max_sectors>>scale)+1));
7372 int i, x = per_milli/50, y = 20-x;
7373 seq_printf(seq, "[");
7374 for (i = 0; i < x; i++)
7375 seq_printf(seq, "=");
7376 seq_printf(seq, ">");
7377 for (i = 0; i < y; i++)
7378 seq_printf(seq, ".");
7379 seq_printf(seq, "] ");
7381 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
7382 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
7384 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
7386 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
7387 "resync" : "recovery"))),
7388 per_milli/10, per_milli % 10,
7389 (unsigned long long) resync/2,
7390 (unsigned long long) max_sectors/2);
7393 * dt: time from mark until now
7394 * db: blocks written from mark until now
7395 * rt: remaining time
7397 * rt is a sector_t, which is always 64bit now. We are keeping
7398 * the original algorithm, but it is not really necessary.
7400 * Original algorithm:
7401 * So we divide before multiply in case it is 32bit and close
7403 * We scale the divisor (db) by 32 to avoid losing precision
7404 * near the end of resync when the number of remaining sectors
7406 * We then divide rt by 32 after multiplying by db to compensate.
7407 * The '+1' avoids division by zero if db is very small.
7409 dt = ((jiffies - mddev->resync_mark) / HZ);
7412 curr_mark_cnt = mddev->curr_mark_cnt;
7413 recovery_active = atomic_read(&mddev->recovery_active);
7414 resync_mark_cnt = mddev->resync_mark_cnt;
7416 if (curr_mark_cnt >= (recovery_active + resync_mark_cnt))
7417 db = curr_mark_cnt - (recovery_active + resync_mark_cnt);
7419 rt = max_sectors - resync; /* number of remaining sectors */
7420 rt = div64_u64(rt, db/32+1);
7424 seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60,
7425 ((unsigned long)rt % 60)/6);
7427 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
7431 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
7433 struct list_head *tmp;
7435 struct mddev *mddev;
7443 spin_lock(&all_mddevs_lock);
7444 list_for_each(tmp,&all_mddevs)
7446 mddev = list_entry(tmp, struct mddev, all_mddevs);
7448 spin_unlock(&all_mddevs_lock);
7451 spin_unlock(&all_mddevs_lock);
7453 return (void*)2;/* tail */
7457 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
7459 struct list_head *tmp;
7460 struct mddev *next_mddev, *mddev = v;
7466 spin_lock(&all_mddevs_lock);
7468 tmp = all_mddevs.next;
7470 tmp = mddev->all_mddevs.next;
7471 if (tmp != &all_mddevs)
7472 next_mddev = mddev_get(list_entry(tmp,struct mddev,all_mddevs));
7474 next_mddev = (void*)2;
7477 spin_unlock(&all_mddevs_lock);
7485 static void md_seq_stop(struct seq_file *seq, void *v)
7487 struct mddev *mddev = v;
7489 if (mddev && v != (void*)1 && v != (void*)2)
7493 static int md_seq_show(struct seq_file *seq, void *v)
7495 struct mddev *mddev = v;
7497 struct md_rdev *rdev;
7499 if (v == (void*)1) {
7500 struct md_personality *pers;
7501 seq_printf(seq, "Personalities : ");
7502 spin_lock(&pers_lock);
7503 list_for_each_entry(pers, &pers_list, list)
7504 seq_printf(seq, "[%s] ", pers->name);
7506 spin_unlock(&pers_lock);
7507 seq_printf(seq, "\n");
7508 seq->poll_event = atomic_read(&md_event_count);
7511 if (v == (void*)2) {
7516 spin_lock(&mddev->lock);
7517 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
7518 seq_printf(seq, "%s : %sactive", mdname(mddev),
7519 mddev->pers ? "" : "in");
7522 seq_printf(seq, " (read-only)");
7524 seq_printf(seq, " (auto-read-only)");
7525 seq_printf(seq, " %s", mddev->pers->name);
7530 rdev_for_each_rcu(rdev, mddev) {
7531 char b[BDEVNAME_SIZE];
7532 seq_printf(seq, " %s[%d]",
7533 bdevname(rdev->bdev,b), rdev->desc_nr);
7534 if (test_bit(WriteMostly, &rdev->flags))
7535 seq_printf(seq, "(W)");
7536 if (test_bit(Journal, &rdev->flags))
7537 seq_printf(seq, "(J)");
7538 if (test_bit(Faulty, &rdev->flags)) {
7539 seq_printf(seq, "(F)");
7542 if (rdev->raid_disk < 0)
7543 seq_printf(seq, "(S)"); /* spare */
7544 if (test_bit(Replacement, &rdev->flags))
7545 seq_printf(seq, "(R)");
7546 sectors += rdev->sectors;
7550 if (!list_empty(&mddev->disks)) {
7552 seq_printf(seq, "\n %llu blocks",
7553 (unsigned long long)
7554 mddev->array_sectors / 2);
7556 seq_printf(seq, "\n %llu blocks",
7557 (unsigned long long)sectors / 2);
7559 if (mddev->persistent) {
7560 if (mddev->major_version != 0 ||
7561 mddev->minor_version != 90) {
7562 seq_printf(seq," super %d.%d",
7563 mddev->major_version,
7564 mddev->minor_version);
7566 } else if (mddev->external)
7567 seq_printf(seq, " super external:%s",
7568 mddev->metadata_type);
7570 seq_printf(seq, " super non-persistent");
7573 mddev->pers->status(seq, mddev);
7574 seq_printf(seq, "\n ");
7575 if (mddev->pers->sync_request) {
7576 if (status_resync(seq, mddev))
7577 seq_printf(seq, "\n ");
7580 seq_printf(seq, "\n ");
7582 bitmap_status(seq, mddev->bitmap);
7584 seq_printf(seq, "\n");
7586 spin_unlock(&mddev->lock);
7591 static const struct seq_operations md_seq_ops = {
7592 .start = md_seq_start,
7593 .next = md_seq_next,
7594 .stop = md_seq_stop,
7595 .show = md_seq_show,
7598 static int md_seq_open(struct inode *inode, struct file *file)
7600 struct seq_file *seq;
7603 error = seq_open(file, &md_seq_ops);
7607 seq = file->private_data;
7608 seq->poll_event = atomic_read(&md_event_count);
7612 static int md_unloading;
7613 static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
7615 struct seq_file *seq = filp->private_data;
7619 return POLLIN|POLLRDNORM|POLLERR|POLLPRI;
7620 poll_wait(filp, &md_event_waiters, wait);
7622 /* always allow read */
7623 mask = POLLIN | POLLRDNORM;
7625 if (seq->poll_event != atomic_read(&md_event_count))
7626 mask |= POLLERR | POLLPRI;
7630 static const struct file_operations md_seq_fops = {
7631 .owner = THIS_MODULE,
7632 .open = md_seq_open,
7634 .llseek = seq_lseek,
7635 .release = seq_release_private,
7636 .poll = mdstat_poll,
7639 int register_md_personality(struct md_personality *p)
7641 printk(KERN_INFO "md: %s personality registered for level %d\n",
7643 spin_lock(&pers_lock);
7644 list_add_tail(&p->list, &pers_list);
7645 spin_unlock(&pers_lock);
7648 EXPORT_SYMBOL(register_md_personality);
7650 int unregister_md_personality(struct md_personality *p)
7652 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
7653 spin_lock(&pers_lock);
7654 list_del_init(&p->list);
7655 spin_unlock(&pers_lock);
7658 EXPORT_SYMBOL(unregister_md_personality);
7660 int register_md_cluster_operations(struct md_cluster_operations *ops,
7661 struct module *module)
7664 spin_lock(&pers_lock);
7665 if (md_cluster_ops != NULL)
7668 md_cluster_ops = ops;
7669 md_cluster_mod = module;
7671 spin_unlock(&pers_lock);
7674 EXPORT_SYMBOL(register_md_cluster_operations);
7676 int unregister_md_cluster_operations(void)
7678 spin_lock(&pers_lock);
7679 md_cluster_ops = NULL;
7680 spin_unlock(&pers_lock);
7683 EXPORT_SYMBOL(unregister_md_cluster_operations);
7685 int md_setup_cluster(struct mddev *mddev, int nodes)
7687 if (!md_cluster_ops)
7688 request_module("md-cluster");
7689 spin_lock(&pers_lock);
7690 /* ensure module won't be unloaded */
7691 if (!md_cluster_ops || !try_module_get(md_cluster_mod)) {
7692 pr_err("can't find md-cluster module or get it's reference.\n");
7693 spin_unlock(&pers_lock);
7696 spin_unlock(&pers_lock);
7698 return md_cluster_ops->join(mddev, nodes);
7701 void md_cluster_stop(struct mddev *mddev)
7703 if (!md_cluster_ops)
7705 md_cluster_ops->leave(mddev);
7706 module_put(md_cluster_mod);
7709 static int is_mddev_idle(struct mddev *mddev, int init)
7711 struct md_rdev *rdev;
7717 rdev_for_each_rcu(rdev, mddev) {
7718 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
7719 curr_events = (int)part_stat_read(&disk->part0, sectors[0]) +
7720 (int)part_stat_read(&disk->part0, sectors[1]) -
7721 atomic_read(&disk->sync_io);
7722 /* sync IO will cause sync_io to increase before the disk_stats
7723 * as sync_io is counted when a request starts, and
7724 * disk_stats is counted when it completes.
7725 * So resync activity will cause curr_events to be smaller than
7726 * when there was no such activity.
7727 * non-sync IO will cause disk_stat to increase without
7728 * increasing sync_io so curr_events will (eventually)
7729 * be larger than it was before. Once it becomes
7730 * substantially larger, the test below will cause
7731 * the array to appear non-idle, and resync will slow
7733 * If there is a lot of outstanding resync activity when
7734 * we set last_event to curr_events, then all that activity
7735 * completing might cause the array to appear non-idle
7736 * and resync will be slowed down even though there might
7737 * not have been non-resync activity. This will only
7738 * happen once though. 'last_events' will soon reflect
7739 * the state where there is little or no outstanding
7740 * resync requests, and further resync activity will
7741 * always make curr_events less than last_events.
7744 if (init || curr_events - rdev->last_events > 64) {
7745 rdev->last_events = curr_events;
7753 void md_done_sync(struct mddev *mddev, int blocks, int ok)
7755 /* another "blocks" (512byte) blocks have been synced */
7756 atomic_sub(blocks, &mddev->recovery_active);
7757 wake_up(&mddev->recovery_wait);
7759 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7760 set_bit(MD_RECOVERY_ERROR, &mddev->recovery);
7761 md_wakeup_thread(mddev->thread);
7762 // stop recovery, signal do_sync ....
7765 EXPORT_SYMBOL(md_done_sync);
7767 /* md_write_start(mddev, bi)
7768 * If we need to update some array metadata (e.g. 'active' flag
7769 * in superblock) before writing, schedule a superblock update
7770 * and wait for it to complete.
7772 void md_write_start(struct mddev *mddev, struct bio *bi)
7775 if (bio_data_dir(bi) != WRITE)
7778 BUG_ON(mddev->ro == 1);
7779 if (mddev->ro == 2) {
7780 /* need to switch to read/write */
7782 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7783 md_wakeup_thread(mddev->thread);
7784 md_wakeup_thread(mddev->sync_thread);
7787 atomic_inc(&mddev->writes_pending);
7788 if (mddev->safemode == 1)
7789 mddev->safemode = 0;
7790 if (mddev->in_sync) {
7791 spin_lock(&mddev->lock);
7792 if (mddev->in_sync) {
7794 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
7795 set_bit(MD_CHANGE_PENDING, &mddev->flags);
7796 md_wakeup_thread(mddev->thread);
7799 spin_unlock(&mddev->lock);
7802 sysfs_notify_dirent_safe(mddev->sysfs_state);
7803 wait_event(mddev->sb_wait,
7804 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
7806 EXPORT_SYMBOL(md_write_start);
7808 void md_write_end(struct mddev *mddev)
7810 if (atomic_dec_and_test(&mddev->writes_pending)) {
7811 if (mddev->safemode == 2)
7812 md_wakeup_thread(mddev->thread);
7813 else if (mddev->safemode_delay)
7814 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
7817 EXPORT_SYMBOL(md_write_end);
7819 /* md_allow_write(mddev)
7820 * Calling this ensures that the array is marked 'active' so that writes
7821 * may proceed without blocking. It is important to call this before
7822 * attempting a GFP_KERNEL allocation while holding the mddev lock.
7823 * Must be called with mddev_lock held.
7825 * In the ->external case MD_CHANGE_PENDING can not be cleared until mddev->lock
7826 * is dropped, so return -EAGAIN after notifying userspace.
7828 int md_allow_write(struct mddev *mddev)
7834 if (!mddev->pers->sync_request)
7837 spin_lock(&mddev->lock);
7838 if (mddev->in_sync) {
7840 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
7841 set_bit(MD_CHANGE_PENDING, &mddev->flags);
7842 if (mddev->safemode_delay &&
7843 mddev->safemode == 0)
7844 mddev->safemode = 1;
7845 spin_unlock(&mddev->lock);
7846 md_update_sb(mddev, 0);
7847 sysfs_notify_dirent_safe(mddev->sysfs_state);
7849 spin_unlock(&mddev->lock);
7851 if (test_bit(MD_CHANGE_PENDING, &mddev->flags))
7856 EXPORT_SYMBOL_GPL(md_allow_write);
7858 #define SYNC_MARKS 10
7859 #define SYNC_MARK_STEP (3*HZ)
7860 #define UPDATE_FREQUENCY (5*60*HZ)
7861 void md_do_sync(struct md_thread *thread)
7863 struct mddev *mddev = thread->mddev;
7864 struct mddev *mddev2;
7865 unsigned int currspeed = 0,
7867 sector_t max_sectors,j, io_sectors, recovery_done;
7868 unsigned long mark[SYNC_MARKS];
7869 unsigned long update_time;
7870 sector_t mark_cnt[SYNC_MARKS];
7872 struct list_head *tmp;
7873 sector_t last_check;
7875 struct md_rdev *rdev;
7876 char *desc, *action = NULL;
7877 struct blk_plug plug;
7880 /* just incase thread restarts... */
7881 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
7883 if (mddev->ro) {/* never try to sync a read-only array */
7884 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7888 if (mddev_is_clustered(mddev)) {
7889 ret = md_cluster_ops->resync_start(mddev);
7893 set_bit(MD_CLUSTER_RESYNC_LOCKED, &mddev->flags);
7894 if (!(test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
7895 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) ||
7896 test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
7897 && ((unsigned long long)mddev->curr_resync_completed
7898 < (unsigned long long)mddev->resync_max_sectors))
7902 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
7903 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) {
7904 desc = "data-check";
7906 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
7907 desc = "requested-resync";
7911 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
7916 mddev->last_sync_action = action ?: desc;
7918 /* we overload curr_resync somewhat here.
7919 * 0 == not engaged in resync at all
7920 * 2 == checking that there is no conflict with another sync
7921 * 1 == like 2, but have yielded to allow conflicting resync to
7923 * other == active in resync - this many blocks
7925 * Before starting a resync we must have set curr_resync to
7926 * 2, and then checked that every "conflicting" array has curr_resync
7927 * less than ours. When we find one that is the same or higher
7928 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
7929 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
7930 * This will mean we have to start checking from the beginning again.
7935 int mddev2_minor = -1;
7936 mddev->curr_resync = 2;
7939 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
7941 for_each_mddev(mddev2, tmp) {
7942 if (mddev2 == mddev)
7944 if (!mddev->parallel_resync
7945 && mddev2->curr_resync
7946 && match_mddev_units(mddev, mddev2)) {
7948 if (mddev < mddev2 && mddev->curr_resync == 2) {
7949 /* arbitrarily yield */
7950 mddev->curr_resync = 1;
7951 wake_up(&resync_wait);
7953 if (mddev > mddev2 && mddev->curr_resync == 1)
7954 /* no need to wait here, we can wait the next
7955 * time 'round when curr_resync == 2
7958 /* We need to wait 'interruptible' so as not to
7959 * contribute to the load average, and not to
7960 * be caught by 'softlockup'
7962 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
7963 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
7964 mddev2->curr_resync >= mddev->curr_resync) {
7965 if (mddev2_minor != mddev2->md_minor) {
7966 mddev2_minor = mddev2->md_minor;
7967 printk(KERN_INFO "md: delaying %s of %s"
7968 " until %s has finished (they"
7969 " share one or more physical units)\n",
7970 desc, mdname(mddev),
7974 if (signal_pending(current))
7975 flush_signals(current);
7977 finish_wait(&resync_wait, &wq);
7980 finish_wait(&resync_wait, &wq);
7983 } while (mddev->curr_resync < 2);
7986 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
7987 /* resync follows the size requested by the personality,
7988 * which defaults to physical size, but can be virtual size
7990 max_sectors = mddev->resync_max_sectors;
7991 atomic64_set(&mddev->resync_mismatches, 0);
7992 /* we don't use the checkpoint if there's a bitmap */
7993 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
7994 j = mddev->resync_min;
7995 else if (!mddev->bitmap)
7996 j = mddev->recovery_cp;
7998 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
7999 max_sectors = mddev->resync_max_sectors;
8001 /* recovery follows the physical size of devices */
8002 max_sectors = mddev->dev_sectors;
8005 rdev_for_each_rcu(rdev, mddev)
8006 if (rdev->raid_disk >= 0 &&
8007 !test_bit(Journal, &rdev->flags) &&
8008 !test_bit(Faulty, &rdev->flags) &&
8009 !test_bit(In_sync, &rdev->flags) &&
8010 rdev->recovery_offset < j)
8011 j = rdev->recovery_offset;
8014 /* If there is a bitmap, we need to make sure all
8015 * writes that started before we added a spare
8016 * complete before we start doing a recovery.
8017 * Otherwise the write might complete and (via
8018 * bitmap_endwrite) set a bit in the bitmap after the
8019 * recovery has checked that bit and skipped that
8022 if (mddev->bitmap) {
8023 mddev->pers->quiesce(mddev, 1);
8024 mddev->pers->quiesce(mddev, 0);
8028 printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev));
8029 printk(KERN_INFO "md: minimum _guaranteed_ speed:"
8030 " %d KB/sec/disk.\n", speed_min(mddev));
8031 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
8032 "(but not more than %d KB/sec) for %s.\n",
8033 speed_max(mddev), desc);
8035 is_mddev_idle(mddev, 1); /* this initializes IO event counters */
8038 for (m = 0; m < SYNC_MARKS; m++) {
8040 mark_cnt[m] = io_sectors;
8043 mddev->resync_mark = mark[last_mark];
8044 mddev->resync_mark_cnt = mark_cnt[last_mark];
8047 * Tune reconstruction:
8049 window = 32*(PAGE_SIZE/512);
8050 printk(KERN_INFO "md: using %dk window, over a total of %lluk.\n",
8051 window/2, (unsigned long long)max_sectors/2);
8053 atomic_set(&mddev->recovery_active, 0);
8058 "md: resuming %s of %s from checkpoint.\n",
8059 desc, mdname(mddev));
8060 mddev->curr_resync = j;
8062 mddev->curr_resync = 3; /* no longer delayed */
8063 mddev->curr_resync_completed = j;
8064 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
8065 md_new_event(mddev);
8066 update_time = jiffies;
8068 blk_start_plug(&plug);
8069 while (j < max_sectors) {
8074 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8075 ((mddev->curr_resync > mddev->curr_resync_completed &&
8076 (mddev->curr_resync - mddev->curr_resync_completed)
8077 > (max_sectors >> 4)) ||
8078 time_after_eq(jiffies, update_time + UPDATE_FREQUENCY) ||
8079 (j - mddev->curr_resync_completed)*2
8080 >= mddev->resync_max - mddev->curr_resync_completed ||
8081 mddev->curr_resync_completed > mddev->resync_max
8083 /* time to update curr_resync_completed */
8084 wait_event(mddev->recovery_wait,
8085 atomic_read(&mddev->recovery_active) == 0);
8086 mddev->curr_resync_completed = j;
8087 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) &&
8088 j > mddev->recovery_cp)
8089 mddev->recovery_cp = j;
8090 update_time = jiffies;
8091 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
8092 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
8095 while (j >= mddev->resync_max &&
8096 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
8097 /* As this condition is controlled by user-space,
8098 * we can block indefinitely, so use '_interruptible'
8099 * to avoid triggering warnings.
8101 flush_signals(current); /* just in case */
8102 wait_event_interruptible(mddev->recovery_wait,
8103 mddev->resync_max > j
8104 || test_bit(MD_RECOVERY_INTR,
8108 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8111 sectors = mddev->pers->sync_request(mddev, j, &skipped);
8113 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8117 if (!skipped) { /* actual IO requested */
8118 io_sectors += sectors;
8119 atomic_add(sectors, &mddev->recovery_active);
8122 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8126 if (j > max_sectors)
8127 /* when skipping, extra large numbers can be returned. */
8130 mddev->curr_resync = j;
8131 mddev->curr_mark_cnt = io_sectors;
8132 if (last_check == 0)
8133 /* this is the earliest that rebuild will be
8134 * visible in /proc/mdstat
8136 md_new_event(mddev);
8138 if (last_check + window > io_sectors || j == max_sectors)
8141 last_check = io_sectors;
8143 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
8145 int next = (last_mark+1) % SYNC_MARKS;
8147 mddev->resync_mark = mark[next];
8148 mddev->resync_mark_cnt = mark_cnt[next];
8149 mark[next] = jiffies;
8150 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
8154 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8158 * this loop exits only if either when we are slower than
8159 * the 'hard' speed limit, or the system was IO-idle for
8161 * the system might be non-idle CPU-wise, but we only care
8162 * about not overloading the IO subsystem. (things like an
8163 * e2fsck being done on the RAID array should execute fast)
8167 recovery_done = io_sectors - atomic_read(&mddev->recovery_active);
8168 currspeed = ((unsigned long)(recovery_done - mddev->resync_mark_cnt))/2
8169 /((jiffies-mddev->resync_mark)/HZ +1) +1;
8171 if (currspeed > speed_min(mddev)) {
8172 if (currspeed > speed_max(mddev)) {
8176 if (!is_mddev_idle(mddev, 0)) {
8178 * Give other IO more of a chance.
8179 * The faster the devices, the less we wait.
8181 wait_event(mddev->recovery_wait,
8182 !atomic_read(&mddev->recovery_active));
8186 printk(KERN_INFO "md: %s: %s %s.\n",mdname(mddev), desc,
8187 test_bit(MD_RECOVERY_INTR, &mddev->recovery)
8188 ? "interrupted" : "done");
8190 * this also signals 'finished resyncing' to md_stop
8192 blk_finish_plug(&plug);
8193 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
8195 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8196 !test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8197 mddev->curr_resync > 3) {
8198 mddev->curr_resync_completed = mddev->curr_resync;
8199 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
8201 mddev->pers->sync_request(mddev, max_sectors, &skipped);
8203 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
8204 mddev->curr_resync > 3) {
8205 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
8206 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
8207 if (mddev->curr_resync >= mddev->recovery_cp) {
8209 "md: checkpointing %s of %s.\n",
8210 desc, mdname(mddev));
8211 if (test_bit(MD_RECOVERY_ERROR,
8213 mddev->recovery_cp =
8214 mddev->curr_resync_completed;
8216 mddev->recovery_cp =
8220 mddev->recovery_cp = MaxSector;
8222 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8223 mddev->curr_resync = MaxSector;
8225 rdev_for_each_rcu(rdev, mddev)
8226 if (rdev->raid_disk >= 0 &&
8227 mddev->delta_disks >= 0 &&
8228 !test_bit(Journal, &rdev->flags) &&
8229 !test_bit(Faulty, &rdev->flags) &&
8230 !test_bit(In_sync, &rdev->flags) &&
8231 rdev->recovery_offset < mddev->curr_resync)
8232 rdev->recovery_offset = mddev->curr_resync;
8237 /* set CHANGE_PENDING here since maybe another update is needed,
8238 * so other nodes are informed. It should be harmless for normal
8240 set_mask_bits(&mddev->flags, 0,
8241 BIT(MD_CHANGE_PENDING) | BIT(MD_CHANGE_DEVS));
8243 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8244 !test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8245 mddev->delta_disks > 0 &&
8246 mddev->pers->finish_reshape &&
8247 mddev->pers->size &&
8249 mddev_lock_nointr(mddev);
8250 md_set_array_sectors(mddev, mddev->pers->size(mddev, 0, 0));
8251 mddev_unlock(mddev);
8252 set_capacity(mddev->gendisk, mddev->array_sectors);
8253 revalidate_disk(mddev->gendisk);
8256 spin_lock(&mddev->lock);
8257 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
8258 /* We completed so min/max setting can be forgotten if used. */
8259 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
8260 mddev->resync_min = 0;
8261 mddev->resync_max = MaxSector;
8262 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
8263 mddev->resync_min = mddev->curr_resync_completed;
8264 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
8265 mddev->curr_resync = 0;
8266 spin_unlock(&mddev->lock);
8268 wake_up(&resync_wait);
8269 md_wakeup_thread(mddev->thread);
8272 EXPORT_SYMBOL_GPL(md_do_sync);
8274 static int remove_and_add_spares(struct mddev *mddev,
8275 struct md_rdev *this)
8277 struct md_rdev *rdev;
8280 bool remove_some = false;
8282 if (this && test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
8283 /* Mustn't remove devices when resync thread is running */
8286 rdev_for_each(rdev, mddev) {
8287 if ((this == NULL || rdev == this) &&
8288 rdev->raid_disk >= 0 &&
8289 !test_bit(Blocked, &rdev->flags) &&
8290 test_bit(Faulty, &rdev->flags) &&
8291 atomic_read(&rdev->nr_pending)==0) {
8292 /* Faulty non-Blocked devices with nr_pending == 0
8293 * never get nr_pending incremented,
8294 * never get Faulty cleared, and never get Blocked set.
8295 * So we can synchronize_rcu now rather than once per device
8298 set_bit(RemoveSynchronized, &rdev->flags);
8304 rdev_for_each(rdev, mddev) {
8305 if ((this == NULL || rdev == this) &&
8306 rdev->raid_disk >= 0 &&
8307 !test_bit(Blocked, &rdev->flags) &&
8308 ((test_bit(RemoveSynchronized, &rdev->flags) ||
8309 (!test_bit(In_sync, &rdev->flags) &&
8310 !test_bit(Journal, &rdev->flags))) &&
8311 atomic_read(&rdev->nr_pending)==0)) {
8312 if (mddev->pers->hot_remove_disk(
8313 mddev, rdev) == 0) {
8314 sysfs_unlink_rdev(mddev, rdev);
8315 rdev->saved_raid_disk = rdev->raid_disk;
8316 rdev->raid_disk = -1;
8320 if (remove_some && test_bit(RemoveSynchronized, &rdev->flags))
8321 clear_bit(RemoveSynchronized, &rdev->flags);
8324 if (removed && mddev->kobj.sd)
8325 sysfs_notify(&mddev->kobj, NULL, "degraded");
8327 if (this && removed)
8330 rdev_for_each(rdev, mddev) {
8331 if (this && this != rdev)
8333 if (test_bit(Candidate, &rdev->flags))
8335 if (rdev->raid_disk >= 0 &&
8336 !test_bit(In_sync, &rdev->flags) &&
8337 !test_bit(Journal, &rdev->flags) &&
8338 !test_bit(Faulty, &rdev->flags))
8340 if (rdev->raid_disk >= 0)
8342 if (test_bit(Faulty, &rdev->flags))
8344 if (!test_bit(Journal, &rdev->flags)) {
8346 ! (rdev->saved_raid_disk >= 0 &&
8347 !test_bit(Bitmap_sync, &rdev->flags)))
8350 rdev->recovery_offset = 0;
8353 hot_add_disk(mddev, rdev) == 0) {
8354 if (sysfs_link_rdev(mddev, rdev))
8355 /* failure here is OK */;
8356 if (!test_bit(Journal, &rdev->flags))
8358 md_new_event(mddev);
8359 set_bit(MD_CHANGE_DEVS, &mddev->flags);
8364 set_bit(MD_CHANGE_DEVS, &mddev->flags);
8368 static void md_start_sync(struct work_struct *ws)
8370 struct mddev *mddev = container_of(ws, struct mddev, del_work);
8372 mddev->sync_thread = md_register_thread(md_do_sync,
8375 if (!mddev->sync_thread) {
8376 printk(KERN_ERR "%s: could not start resync thread...\n",
8378 /* leave the spares where they are, it shouldn't hurt */
8379 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8380 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
8381 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
8382 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
8383 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
8384 wake_up(&resync_wait);
8385 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
8387 if (mddev->sysfs_action)
8388 sysfs_notify_dirent_safe(mddev->sysfs_action);
8390 md_wakeup_thread(mddev->sync_thread);
8391 sysfs_notify_dirent_safe(mddev->sysfs_action);
8392 md_new_event(mddev);
8396 * This routine is regularly called by all per-raid-array threads to
8397 * deal with generic issues like resync and super-block update.
8398 * Raid personalities that don't have a thread (linear/raid0) do not
8399 * need this as they never do any recovery or update the superblock.
8401 * It does not do any resync itself, but rather "forks" off other threads
8402 * to do that as needed.
8403 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
8404 * "->recovery" and create a thread at ->sync_thread.
8405 * When the thread finishes it sets MD_RECOVERY_DONE
8406 * and wakeups up this thread which will reap the thread and finish up.
8407 * This thread also removes any faulty devices (with nr_pending == 0).
8409 * The overall approach is:
8410 * 1/ if the superblock needs updating, update it.
8411 * 2/ If a recovery thread is running, don't do anything else.
8412 * 3/ If recovery has finished, clean up, possibly marking spares active.
8413 * 4/ If there are any faulty devices, remove them.
8414 * 5/ If array is degraded, try to add spares devices
8415 * 6/ If array has spares or is not in-sync, start a resync thread.
8417 void md_check_recovery(struct mddev *mddev)
8419 if (mddev->suspended)
8423 bitmap_daemon_work(mddev);
8425 if (signal_pending(current)) {
8426 if (mddev->pers->sync_request && !mddev->external) {
8427 printk(KERN_INFO "md: %s in immediate safe mode\n",
8429 mddev->safemode = 2;
8431 flush_signals(current);
8434 if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
8437 (mddev->flags & MD_UPDATE_SB_FLAGS & ~ (1<<MD_CHANGE_PENDING)) ||
8438 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
8439 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
8440 test_bit(MD_RELOAD_SB, &mddev->flags) ||
8441 (mddev->external == 0 && mddev->safemode == 1) ||
8442 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
8443 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
8447 if (mddev_trylock(mddev)) {
8451 struct md_rdev *rdev;
8452 if (!mddev->external && mddev->in_sync)
8453 /* 'Blocked' flag not needed as failed devices
8454 * will be recorded if array switched to read/write.
8455 * Leaving it set will prevent the device
8456 * from being removed.
8458 rdev_for_each(rdev, mddev)
8459 clear_bit(Blocked, &rdev->flags);
8460 /* On a read-only array we can:
8461 * - remove failed devices
8462 * - add already-in_sync devices if the array itself
8464 * As we only add devices that are already in-sync,
8465 * we can activate the spares immediately.
8467 remove_and_add_spares(mddev, NULL);
8468 /* There is no thread, but we need to call
8469 * ->spare_active and clear saved_raid_disk
8471 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8472 md_reap_sync_thread(mddev);
8473 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8474 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8475 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
8479 if (mddev_is_clustered(mddev)) {
8480 struct md_rdev *rdev, *tmp;
8481 /* kick the device if another node issued a
8484 rdev_for_each_safe(rdev, tmp, mddev) {
8485 if (test_and_clear_bit(ClusterRemove, &rdev->flags) &&
8486 rdev->raid_disk < 0)
8487 md_kick_rdev_from_array(rdev);
8490 if (test_and_clear_bit(MD_RELOAD_SB, &mddev->flags))
8491 md_reload_sb(mddev, mddev->good_device_nr);
8494 if (!mddev->external) {
8496 spin_lock(&mddev->lock);
8497 if (mddev->safemode &&
8498 !atomic_read(&mddev->writes_pending) &&
8500 mddev->recovery_cp == MaxSector) {
8503 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
8505 if (mddev->safemode == 1)
8506 mddev->safemode = 0;
8507 spin_unlock(&mddev->lock);
8509 sysfs_notify_dirent_safe(mddev->sysfs_state);
8512 if (mddev->flags & MD_UPDATE_SB_FLAGS)
8513 md_update_sb(mddev, 0);
8515 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
8516 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
8517 /* resync/recovery still happening */
8518 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8521 if (mddev->sync_thread) {
8522 md_reap_sync_thread(mddev);
8525 /* Set RUNNING before clearing NEEDED to avoid
8526 * any transients in the value of "sync_action".
8528 mddev->curr_resync_completed = 0;
8529 spin_lock(&mddev->lock);
8530 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
8531 spin_unlock(&mddev->lock);
8532 /* Clear some bits that don't mean anything, but
8535 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
8536 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
8538 if (!test_and_clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
8539 test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
8541 /* no recovery is running.
8542 * remove any failed drives, then
8543 * add spares if possible.
8544 * Spares are also removed and re-added, to allow
8545 * the personality to fail the re-add.
8548 if (mddev->reshape_position != MaxSector) {
8549 if (mddev->pers->check_reshape == NULL ||
8550 mddev->pers->check_reshape(mddev) != 0)
8551 /* Cannot proceed */
8553 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
8554 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8555 } else if ((spares = remove_and_add_spares(mddev, NULL))) {
8556 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8557 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
8558 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
8559 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8560 } else if (mddev->recovery_cp < MaxSector) {
8561 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8562 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8563 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
8564 /* nothing to be done ... */
8567 if (mddev->pers->sync_request) {
8569 /* We are adding a device or devices to an array
8570 * which has the bitmap stored on all devices.
8571 * So make sure all bitmap pages get written
8573 bitmap_write_all(mddev->bitmap);
8575 INIT_WORK(&mddev->del_work, md_start_sync);
8576 queue_work(md_misc_wq, &mddev->del_work);
8580 if (!mddev->sync_thread) {
8581 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
8582 wake_up(&resync_wait);
8583 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
8585 if (mddev->sysfs_action)
8586 sysfs_notify_dirent_safe(mddev->sysfs_action);
8589 wake_up(&mddev->sb_wait);
8590 mddev_unlock(mddev);
8593 EXPORT_SYMBOL(md_check_recovery);
8595 void md_reap_sync_thread(struct mddev *mddev)
8597 struct md_rdev *rdev;
8599 /* resync has finished, collect result */
8600 md_unregister_thread(&mddev->sync_thread);
8601 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8602 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) &&
8603 mddev->degraded != mddev->raid_disks) {
8605 /* activate any spares */
8606 if (mddev->pers->spare_active(mddev)) {
8607 sysfs_notify(&mddev->kobj, NULL,
8609 set_bit(MD_CHANGE_DEVS, &mddev->flags);
8612 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8613 mddev->pers->finish_reshape)
8614 mddev->pers->finish_reshape(mddev);
8616 /* If array is no-longer degraded, then any saved_raid_disk
8617 * information must be scrapped.
8619 if (!mddev->degraded)
8620 rdev_for_each(rdev, mddev)
8621 rdev->saved_raid_disk = -1;
8623 md_update_sb(mddev, 1);
8624 /* MD_CHANGE_PENDING should be cleared by md_update_sb, so we can
8625 * call resync_finish here if MD_CLUSTER_RESYNC_LOCKED is set by
8627 if (test_and_clear_bit(MD_CLUSTER_RESYNC_LOCKED, &mddev->flags))
8628 md_cluster_ops->resync_finish(mddev);
8629 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
8630 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
8631 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8632 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
8633 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
8634 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
8635 wake_up(&resync_wait);
8636 /* flag recovery needed just to double check */
8637 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8638 sysfs_notify_dirent_safe(mddev->sysfs_action);
8639 md_new_event(mddev);
8640 if (mddev->event_work.func)
8641 queue_work(md_misc_wq, &mddev->event_work);
8643 EXPORT_SYMBOL(md_reap_sync_thread);
8645 void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev)
8647 sysfs_notify_dirent_safe(rdev->sysfs_state);
8648 wait_event_timeout(rdev->blocked_wait,
8649 !test_bit(Blocked, &rdev->flags) &&
8650 !test_bit(BlockedBadBlocks, &rdev->flags),
8651 msecs_to_jiffies(5000));
8652 rdev_dec_pending(rdev, mddev);
8654 EXPORT_SYMBOL(md_wait_for_blocked_rdev);
8656 void md_finish_reshape(struct mddev *mddev)
8658 /* called be personality module when reshape completes. */
8659 struct md_rdev *rdev;
8661 rdev_for_each(rdev, mddev) {
8662 if (rdev->data_offset > rdev->new_data_offset)
8663 rdev->sectors += rdev->data_offset - rdev->new_data_offset;
8665 rdev->sectors -= rdev->new_data_offset - rdev->data_offset;
8666 rdev->data_offset = rdev->new_data_offset;
8669 EXPORT_SYMBOL(md_finish_reshape);
8671 /* Bad block management */
8673 /* Returns 1 on success, 0 on failure */
8674 int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
8677 struct mddev *mddev = rdev->mddev;
8680 s += rdev->new_data_offset;
8682 s += rdev->data_offset;
8683 rv = badblocks_set(&rdev->badblocks, s, sectors, 0);
8685 /* Make sure they get written out promptly */
8686 sysfs_notify_dirent_safe(rdev->sysfs_state);
8687 set_mask_bits(&mddev->flags, 0,
8688 BIT(MD_CHANGE_CLEAN) | BIT(MD_CHANGE_PENDING));
8689 md_wakeup_thread(rdev->mddev->thread);
8694 EXPORT_SYMBOL_GPL(rdev_set_badblocks);
8696 int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
8700 s += rdev->new_data_offset;
8702 s += rdev->data_offset;
8703 return badblocks_clear(&rdev->badblocks,
8706 EXPORT_SYMBOL_GPL(rdev_clear_badblocks);
8708 static int md_notify_reboot(struct notifier_block *this,
8709 unsigned long code, void *x)
8711 struct list_head *tmp;
8712 struct mddev *mddev;
8715 for_each_mddev(mddev, tmp) {
8716 if (mddev_trylock(mddev)) {
8718 __md_stop_writes(mddev);
8719 if (mddev->persistent)
8720 mddev->safemode = 2;
8721 mddev_unlock(mddev);
8726 * certain more exotic SCSI devices are known to be
8727 * volatile wrt too early system reboots. While the
8728 * right place to handle this issue is the given
8729 * driver, we do want to have a safe RAID driver ...
8737 static struct notifier_block md_notifier = {
8738 .notifier_call = md_notify_reboot,
8740 .priority = INT_MAX, /* before any real devices */
8743 static void md_geninit(void)
8745 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
8747 proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops);
8750 static int __init md_init(void)
8754 md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0);
8758 md_misc_wq = alloc_workqueue("md_misc", 0, 0);
8762 if ((ret = register_blkdev(MD_MAJOR, "md")) < 0)
8765 if ((ret = register_blkdev(0, "mdp")) < 0)
8769 blk_register_region(MKDEV(MD_MAJOR, 0), 512, THIS_MODULE,
8770 md_probe, NULL, NULL);
8771 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
8772 md_probe, NULL, NULL);
8774 register_reboot_notifier(&md_notifier);
8775 raid_table_header = register_sysctl_table(raid_root_table);
8781 unregister_blkdev(MD_MAJOR, "md");
8783 destroy_workqueue(md_misc_wq);
8785 destroy_workqueue(md_wq);
8790 static void check_sb_changes(struct mddev *mddev, struct md_rdev *rdev)
8792 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
8793 struct md_rdev *rdev2, *tmp;
8795 char b[BDEVNAME_SIZE];
8797 /* Check for change of roles in the active devices */
8798 rdev_for_each_safe(rdev2, tmp, mddev) {
8799 if (test_bit(Faulty, &rdev2->flags))
8802 /* Check if the roles changed */
8803 role = le16_to_cpu(sb->dev_roles[rdev2->desc_nr]);
8805 if (test_bit(Candidate, &rdev2->flags)) {
8806 if (role == 0xfffe) {
8807 pr_info("md: Removing Candidate device %s because add failed\n", bdevname(rdev2->bdev,b));
8808 md_kick_rdev_from_array(rdev2);
8812 clear_bit(Candidate, &rdev2->flags);
8815 if (role != rdev2->raid_disk) {
8817 if (rdev2->raid_disk == -1 && role != 0xffff) {
8818 rdev2->saved_raid_disk = role;
8819 ret = remove_and_add_spares(mddev, rdev2);
8820 pr_info("Activated spare: %s\n",
8821 bdevname(rdev2->bdev,b));
8822 /* wakeup mddev->thread here, so array could
8823 * perform resync with the new activated disk */
8824 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8825 md_wakeup_thread(mddev->thread);
8829 * We just want to do the minimum to mark the disk
8830 * as faulty. The recovery is performed by the
8831 * one who initiated the error.
8833 if ((role == 0xfffe) || (role == 0xfffd)) {
8834 md_error(mddev, rdev2);
8835 clear_bit(Blocked, &rdev2->flags);
8840 if (mddev->raid_disks != le32_to_cpu(sb->raid_disks))
8841 update_raid_disks(mddev, le32_to_cpu(sb->raid_disks));
8843 /* Finally set the event to be up to date */
8844 mddev->events = le64_to_cpu(sb->events);
8847 static int read_rdev(struct mddev *mddev, struct md_rdev *rdev)
8850 struct page *swapout = rdev->sb_page;
8851 struct mdp_superblock_1 *sb;
8853 /* Store the sb page of the rdev in the swapout temporary
8854 * variable in case we err in the future
8856 rdev->sb_page = NULL;
8857 alloc_disk_sb(rdev);
8858 ClearPageUptodate(rdev->sb_page);
8859 rdev->sb_loaded = 0;
8860 err = super_types[mddev->major_version].load_super(rdev, NULL, mddev->minor_version);
8863 pr_warn("%s: %d Could not reload rdev(%d) err: %d. Restoring old values\n",
8864 __func__, __LINE__, rdev->desc_nr, err);
8865 put_page(rdev->sb_page);
8866 rdev->sb_page = swapout;
8867 rdev->sb_loaded = 1;
8871 sb = page_address(rdev->sb_page);
8872 /* Read the offset unconditionally, even if MD_FEATURE_RECOVERY_OFFSET
8876 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RECOVERY_OFFSET))
8877 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
8879 /* The other node finished recovery, call spare_active to set
8880 * device In_sync and mddev->degraded
8882 if (rdev->recovery_offset == MaxSector &&
8883 !test_bit(In_sync, &rdev->flags) &&
8884 mddev->pers->spare_active(mddev))
8885 sysfs_notify(&mddev->kobj, NULL, "degraded");
8891 void md_reload_sb(struct mddev *mddev, int nr)
8893 struct md_rdev *rdev = NULL, *iter;
8897 rdev_for_each_rcu(iter, mddev) {
8898 if (iter->desc_nr == nr) {
8905 pr_warn("%s: %d Could not find rdev with nr %d\n", __func__, __LINE__, nr);
8909 err = read_rdev(mddev, rdev);
8913 check_sb_changes(mddev, rdev);
8915 /* Read all rdev's to update recovery_offset */
8916 rdev_for_each_rcu(rdev, mddev)
8917 read_rdev(mddev, rdev);
8919 EXPORT_SYMBOL(md_reload_sb);
8924 * Searches all registered partitions for autorun RAID arrays
8928 static DEFINE_MUTEX(detected_devices_mutex);
8929 static LIST_HEAD(all_detected_devices);
8930 struct detected_devices_node {
8931 struct list_head list;
8935 void md_autodetect_dev(dev_t dev)
8937 struct detected_devices_node *node_detected_dev;
8939 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
8940 if (node_detected_dev) {
8941 node_detected_dev->dev = dev;
8942 mutex_lock(&detected_devices_mutex);
8943 list_add_tail(&node_detected_dev->list, &all_detected_devices);
8944 mutex_unlock(&detected_devices_mutex);
8946 printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed"
8947 ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev));
8951 static void autostart_arrays(int part)
8953 struct md_rdev *rdev;
8954 struct detected_devices_node *node_detected_dev;
8956 int i_scanned, i_passed;
8961 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
8963 mutex_lock(&detected_devices_mutex);
8964 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
8966 node_detected_dev = list_entry(all_detected_devices.next,
8967 struct detected_devices_node, list);
8968 list_del(&node_detected_dev->list);
8969 dev = node_detected_dev->dev;
8970 kfree(node_detected_dev);
8971 mutex_unlock(&detected_devices_mutex);
8972 rdev = md_import_device(dev,0, 90);
8973 mutex_lock(&detected_devices_mutex);
8977 if (test_bit(Faulty, &rdev->flags))
8980 set_bit(AutoDetected, &rdev->flags);
8981 list_add(&rdev->same_set, &pending_raid_disks);
8984 mutex_unlock(&detected_devices_mutex);
8986 printk(KERN_INFO "md: Scanned %d and added %d devices.\n",
8987 i_scanned, i_passed);
8989 autorun_devices(part);
8992 #endif /* !MODULE */
8994 static __exit void md_exit(void)
8996 struct mddev *mddev;
8997 struct list_head *tmp;
9000 blk_unregister_region(MKDEV(MD_MAJOR,0), 512);
9001 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
9003 unregister_blkdev(MD_MAJOR,"md");
9004 unregister_blkdev(mdp_major, "mdp");
9005 unregister_reboot_notifier(&md_notifier);
9006 unregister_sysctl_table(raid_table_header);
9008 /* We cannot unload the modules while some process is
9009 * waiting for us in select() or poll() - wake them up
9012 while (waitqueue_active(&md_event_waiters)) {
9013 /* not safe to leave yet */
9014 wake_up(&md_event_waiters);
9018 remove_proc_entry("mdstat", NULL);
9020 for_each_mddev(mddev, tmp) {
9021 export_array(mddev);
9022 mddev->hold_active = 0;
9024 destroy_workqueue(md_misc_wq);
9025 destroy_workqueue(md_wq);
9028 subsys_initcall(md_init);
9029 module_exit(md_exit)
9031 static int get_ro(char *buffer, struct kernel_param *kp)
9033 return sprintf(buffer, "%d", start_readonly);
9035 static int set_ro(const char *val, struct kernel_param *kp)
9037 return kstrtouint(val, 10, (unsigned int *)&start_readonly);
9040 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
9041 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
9042 module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR);
9044 MODULE_LICENSE("GPL");
9045 MODULE_DESCRIPTION("MD RAID framework");
9047 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);