1 // SPDX-License-Identifier: GPL-2.0-or-later
3 md.c : Multiple Devices driver for Linux
4 Copyright (C) 1998, 1999, 2000 Ingo Molnar
6 completely rewritten, based on the MD driver code from Marc Zyngier
10 - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar
11 - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com>
12 - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net>
13 - kerneld support by Boris Tobotras <boris@xtalk.msk.su>
14 - kmod support by: Cyrus Durgin
15 - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com>
16 - Devfs support by Richard Gooch <rgooch@atnf.csiro.au>
18 - lots of fixes and improvements to the RAID1/RAID5 and generic
19 RAID code (such as request based resynchronization):
21 Neil Brown <neilb@cse.unsw.edu.au>.
23 - persistent bitmap code
24 Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.
27 Errors, Warnings, etc.
29 pr_crit() for error conditions that risk data loss
30 pr_err() for error conditions that are unexpected, like an IO error
31 or internal inconsistency
32 pr_warn() for error conditions that could have been predicated, like
33 adding a device to an array when it has incompatible metadata
34 pr_info() for every interesting, very rare events, like an array starting
35 or stopping, or resync starting or stopping
36 pr_debug() for everything else.
40 #include <linux/sched/mm.h>
41 #include <linux/sched/signal.h>
42 #include <linux/kthread.h>
43 #include <linux/blkdev.h>
44 #include <linux/badblocks.h>
45 #include <linux/sysctl.h>
46 #include <linux/seq_file.h>
48 #include <linux/poll.h>
49 #include <linux/ctype.h>
50 #include <linux/string.h>
51 #include <linux/hdreg.h>
52 #include <linux/proc_fs.h>
53 #include <linux/random.h>
54 #include <linux/module.h>
55 #include <linux/reboot.h>
56 #include <linux/file.h>
57 #include <linux/compat.h>
58 #include <linux/delay.h>
59 #include <linux/raid/md_p.h>
60 #include <linux/raid/md_u.h>
61 #include <linux/slab.h>
62 #include <linux/percpu-refcount.h>
64 #include <trace/events/block.h>
66 #include "md-bitmap.h"
67 #include "md-cluster.h"
70 static void autostart_arrays(int part);
73 /* pers_list is a list of registered personalities protected
75 * pers_lock does extra service to protect accesses to
76 * mddev->thread when the mutex cannot be held.
78 static LIST_HEAD(pers_list);
79 static DEFINE_SPINLOCK(pers_lock);
81 static struct kobj_type md_ktype;
83 struct md_cluster_operations *md_cluster_ops;
84 EXPORT_SYMBOL(md_cluster_ops);
85 static struct module *md_cluster_mod;
87 static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
88 static struct workqueue_struct *md_wq;
89 static struct workqueue_struct *md_misc_wq;
91 static int remove_and_add_spares(struct mddev *mddev,
92 struct md_rdev *this);
93 static void mddev_detach(struct mddev *mddev);
96 * Default number of read corrections we'll attempt on an rdev
97 * before ejecting it from the array. We divide the read error
98 * count by 2 for every hour elapsed between read errors.
100 #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
102 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
103 * is 1000 KB/sec, so the extra system load does not show up that much.
104 * Increase it if you want to have more _guaranteed_ speed. Note that
105 * the RAID driver will use the maximum available bandwidth if the IO
106 * subsystem is idle. There is also an 'absolute maximum' reconstruction
107 * speed limit - in case reconstruction slows down your system despite
110 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
111 * or /sys/block/mdX/md/sync_speed_{min,max}
114 static int sysctl_speed_limit_min = 1000;
115 static int sysctl_speed_limit_max = 200000;
116 static inline int speed_min(struct mddev *mddev)
118 return mddev->sync_speed_min ?
119 mddev->sync_speed_min : sysctl_speed_limit_min;
122 static inline int speed_max(struct mddev *mddev)
124 return mddev->sync_speed_max ?
125 mddev->sync_speed_max : sysctl_speed_limit_max;
128 static int rdev_init_wb(struct md_rdev *rdev)
130 if (rdev->bdev->bd_queue->nr_hw_queues == 1)
133 spin_lock_init(&rdev->wb_list_lock);
134 INIT_LIST_HEAD(&rdev->wb_list);
135 init_waitqueue_head(&rdev->wb_io_wait);
136 set_bit(WBCollisionCheck, &rdev->flags);
142 * Create wb_info_pool if rdev is the first multi-queue device flaged
143 * with writemostly, also write-behind mode is enabled.
145 void mddev_create_wb_pool(struct mddev *mddev, struct md_rdev *rdev,
148 if (mddev->bitmap_info.max_write_behind == 0)
151 if (!test_bit(WriteMostly, &rdev->flags) || !rdev_init_wb(rdev))
154 if (mddev->wb_info_pool == NULL) {
155 unsigned int noio_flag;
158 mddev_suspend(mddev);
159 noio_flag = memalloc_noio_save();
160 mddev->wb_info_pool = mempool_create_kmalloc_pool(NR_WB_INFOS,
161 sizeof(struct wb_info));
162 memalloc_noio_restore(noio_flag);
163 if (!mddev->wb_info_pool)
164 pr_err("can't alloc memory pool for writemostly\n");
169 EXPORT_SYMBOL_GPL(mddev_create_wb_pool);
172 * destroy wb_info_pool if rdev is the last device flaged with WBCollisionCheck.
174 static void mddev_destroy_wb_pool(struct mddev *mddev, struct md_rdev *rdev)
176 if (!test_and_clear_bit(WBCollisionCheck, &rdev->flags))
179 if (mddev->wb_info_pool) {
180 struct md_rdev *temp;
184 * Check if other rdevs need wb_info_pool.
186 rdev_for_each(temp, mddev)
188 test_bit(WBCollisionCheck, &temp->flags))
191 mddev_suspend(rdev->mddev);
192 mempool_destroy(mddev->wb_info_pool);
193 mddev->wb_info_pool = NULL;
194 mddev_resume(rdev->mddev);
199 static struct ctl_table_header *raid_table_header;
201 static struct ctl_table raid_table[] = {
203 .procname = "speed_limit_min",
204 .data = &sysctl_speed_limit_min,
205 .maxlen = sizeof(int),
206 .mode = S_IRUGO|S_IWUSR,
207 .proc_handler = proc_dointvec,
210 .procname = "speed_limit_max",
211 .data = &sysctl_speed_limit_max,
212 .maxlen = sizeof(int),
213 .mode = S_IRUGO|S_IWUSR,
214 .proc_handler = proc_dointvec,
219 static struct ctl_table raid_dir_table[] = {
223 .mode = S_IRUGO|S_IXUGO,
229 static struct ctl_table raid_root_table[] = {
234 .child = raid_dir_table,
239 static const struct block_device_operations md_fops;
241 static int start_readonly;
244 * The original mechanism for creating an md device is to create
245 * a device node in /dev and to open it. This causes races with device-close.
246 * The preferred method is to write to the "new_array" module parameter.
247 * This can avoid races.
248 * Setting create_on_open to false disables the original mechanism
249 * so all the races disappear.
251 static bool create_on_open = true;
253 struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs,
256 if (!mddev || !bioset_initialized(&mddev->bio_set))
257 return bio_alloc(gfp_mask, nr_iovecs);
259 return bio_alloc_bioset(gfp_mask, nr_iovecs, &mddev->bio_set);
261 EXPORT_SYMBOL_GPL(bio_alloc_mddev);
263 static struct bio *md_bio_alloc_sync(struct mddev *mddev)
265 if (!mddev || !bioset_initialized(&mddev->sync_set))
266 return bio_alloc(GFP_NOIO, 1);
268 return bio_alloc_bioset(GFP_NOIO, 1, &mddev->sync_set);
272 * We have a system wide 'event count' that is incremented
273 * on any 'interesting' event, and readers of /proc/mdstat
274 * can use 'poll' or 'select' to find out when the event
278 * start array, stop array, error, add device, remove device,
279 * start build, activate spare
281 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
282 static atomic_t md_event_count;
283 void md_new_event(struct mddev *mddev)
285 atomic_inc(&md_event_count);
286 wake_up(&md_event_waiters);
288 EXPORT_SYMBOL_GPL(md_new_event);
291 * Enables to iterate over all existing md arrays
292 * all_mddevs_lock protects this list.
294 static LIST_HEAD(all_mddevs);
295 static DEFINE_SPINLOCK(all_mddevs_lock);
298 * iterates through all used mddevs in the system.
299 * We take care to grab the all_mddevs_lock whenever navigating
300 * the list, and to always hold a refcount when unlocked.
301 * Any code which breaks out of this loop while own
302 * a reference to the current mddev and must mddev_put it.
304 #define for_each_mddev(_mddev,_tmp) \
306 for (({ spin_lock(&all_mddevs_lock); \
307 _tmp = all_mddevs.next; \
309 ({ if (_tmp != &all_mddevs) \
310 mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\
311 spin_unlock(&all_mddevs_lock); \
312 if (_mddev) mddev_put(_mddev); \
313 _mddev = list_entry(_tmp, struct mddev, all_mddevs); \
314 _tmp != &all_mddevs;}); \
315 ({ spin_lock(&all_mddevs_lock); \
316 _tmp = _tmp->next;}) \
319 /* Rather than calling directly into the personality make_request function,
320 * IO requests come here first so that we can check if the device is
321 * being suspended pending a reconfiguration.
322 * We hold a refcount over the call to ->make_request. By the time that
323 * call has finished, the bio has been linked into some internal structure
324 * and so is visible to ->quiesce(), so we don't need the refcount any more.
326 static bool is_suspended(struct mddev *mddev, struct bio *bio)
328 if (mddev->suspended)
330 if (bio_data_dir(bio) != WRITE)
332 if (mddev->suspend_lo >= mddev->suspend_hi)
334 if (bio->bi_iter.bi_sector >= mddev->suspend_hi)
336 if (bio_end_sector(bio) < mddev->suspend_lo)
341 void md_handle_request(struct mddev *mddev, struct bio *bio)
345 if (is_suspended(mddev, bio)) {
348 prepare_to_wait(&mddev->sb_wait, &__wait,
349 TASK_UNINTERRUPTIBLE);
350 if (!is_suspended(mddev, bio))
356 finish_wait(&mddev->sb_wait, &__wait);
358 atomic_inc(&mddev->active_io);
361 if (!mddev->pers->make_request(mddev, bio)) {
362 atomic_dec(&mddev->active_io);
363 wake_up(&mddev->sb_wait);
364 goto check_suspended;
367 if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended)
368 wake_up(&mddev->sb_wait);
370 EXPORT_SYMBOL(md_handle_request);
372 static blk_qc_t md_make_request(struct request_queue *q, struct bio *bio)
374 const int rw = bio_data_dir(bio);
375 const int sgrp = op_stat_group(bio_op(bio));
376 struct mddev *mddev = q->queuedata;
377 unsigned int sectors;
379 if (mddev == NULL || mddev->pers == NULL) {
381 return BLK_QC_T_NONE;
384 if (unlikely(test_bit(MD_BROKEN, &mddev->flags)) && (rw == WRITE)) {
386 return BLK_QC_T_NONE;
389 blk_queue_split(q, &bio);
391 if (mddev->ro == 1 && unlikely(rw == WRITE)) {
392 if (bio_sectors(bio) != 0)
393 bio->bi_status = BLK_STS_IOERR;
395 return BLK_QC_T_NONE;
399 * save the sectors now since our bio can
400 * go away inside make_request
402 sectors = bio_sectors(bio);
403 /* bio could be mergeable after passing to underlayer */
404 bio->bi_opf &= ~REQ_NOMERGE;
406 md_handle_request(mddev, bio);
409 part_stat_inc(&mddev->gendisk->part0, ios[sgrp]);
410 part_stat_add(&mddev->gendisk->part0, sectors[sgrp], sectors);
413 return BLK_QC_T_NONE;
416 /* mddev_suspend makes sure no new requests are submitted
417 * to the device, and that any requests that have been submitted
418 * are completely handled.
419 * Once mddev_detach() is called and completes, the module will be
422 void mddev_suspend(struct mddev *mddev)
424 WARN_ON_ONCE(mddev->thread && current == mddev->thread->tsk);
425 lockdep_assert_held(&mddev->reconfig_mutex);
426 if (mddev->suspended++)
429 wake_up(&mddev->sb_wait);
430 set_bit(MD_ALLOW_SB_UPDATE, &mddev->flags);
431 smp_mb__after_atomic();
432 wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0);
433 mddev->pers->quiesce(mddev, 1);
434 clear_bit_unlock(MD_ALLOW_SB_UPDATE, &mddev->flags);
435 wait_event(mddev->sb_wait, !test_bit(MD_UPDATING_SB, &mddev->flags));
437 del_timer_sync(&mddev->safemode_timer);
439 EXPORT_SYMBOL_GPL(mddev_suspend);
441 void mddev_resume(struct mddev *mddev)
443 lockdep_assert_held(&mddev->reconfig_mutex);
444 if (--mddev->suspended)
446 wake_up(&mddev->sb_wait);
447 mddev->pers->quiesce(mddev, 0);
449 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
450 md_wakeup_thread(mddev->thread);
451 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
453 EXPORT_SYMBOL_GPL(mddev_resume);
455 int mddev_congested(struct mddev *mddev, int bits)
457 struct md_personality *pers = mddev->pers;
461 if (mddev->suspended)
463 else if (pers && pers->congested)
464 ret = pers->congested(mddev, bits);
468 EXPORT_SYMBOL_GPL(mddev_congested);
469 static int md_congested(void *data, int bits)
471 struct mddev *mddev = data;
472 return mddev_congested(mddev, bits);
476 * Generic flush handling for md
479 static void md_end_flush(struct bio *bio)
481 struct md_rdev *rdev = bio->bi_private;
482 struct mddev *mddev = rdev->mddev;
486 rdev_dec_pending(rdev, mddev);
488 if (atomic_dec_and_test(&mddev->flush_pending)) {
489 /* The pre-request flush has finished */
490 queue_work(md_wq, &mddev->flush_work);
494 static void md_submit_flush_data(struct work_struct *ws);
496 static void submit_flushes(struct work_struct *ws)
498 struct mddev *mddev = container_of(ws, struct mddev, flush_work);
499 struct md_rdev *rdev;
501 mddev->start_flush = ktime_get_boottime();
502 INIT_WORK(&mddev->flush_work, md_submit_flush_data);
503 atomic_set(&mddev->flush_pending, 1);
505 rdev_for_each_rcu(rdev, mddev)
506 if (rdev->raid_disk >= 0 &&
507 !test_bit(Faulty, &rdev->flags)) {
508 /* Take two references, one is dropped
509 * when request finishes, one after
510 * we reclaim rcu_read_lock
513 atomic_inc(&rdev->nr_pending);
514 atomic_inc(&rdev->nr_pending);
516 bi = bio_alloc_mddev(GFP_NOIO, 0, mddev);
517 bi->bi_end_io = md_end_flush;
518 bi->bi_private = rdev;
519 bio_set_dev(bi, rdev->bdev);
520 bi->bi_opf = REQ_OP_WRITE | REQ_PREFLUSH;
521 atomic_inc(&mddev->flush_pending);
524 rdev_dec_pending(rdev, mddev);
527 if (atomic_dec_and_test(&mddev->flush_pending))
528 queue_work(md_wq, &mddev->flush_work);
531 static void md_submit_flush_data(struct work_struct *ws)
533 struct mddev *mddev = container_of(ws, struct mddev, flush_work);
534 struct bio *bio = mddev->flush_bio;
537 * must reset flush_bio before calling into md_handle_request to avoid a
538 * deadlock, because other bios passed md_handle_request suspend check
539 * could wait for this and below md_handle_request could wait for those
540 * bios because of suspend check
542 spin_lock_irq(&mddev->lock);
543 mddev->last_flush = mddev->start_flush;
544 mddev->flush_bio = NULL;
545 spin_unlock_irq(&mddev->lock);
546 wake_up(&mddev->sb_wait);
548 if (bio->bi_iter.bi_size == 0) {
549 /* an empty barrier - all done */
552 bio->bi_opf &= ~REQ_PREFLUSH;
553 md_handle_request(mddev, bio);
558 * Manages consolidation of flushes and submitting any flushes needed for
559 * a bio with REQ_PREFLUSH. Returns true if the bio is finished or is
560 * being finished in another context. Returns false if the flushing is
561 * complete but still needs the I/O portion of the bio to be processed.
563 bool md_flush_request(struct mddev *mddev, struct bio *bio)
565 ktime_t start = ktime_get_boottime();
566 spin_lock_irq(&mddev->lock);
567 wait_event_lock_irq(mddev->sb_wait,
569 ktime_after(mddev->last_flush, start),
571 if (!ktime_after(mddev->last_flush, start)) {
572 WARN_ON(mddev->flush_bio);
573 mddev->flush_bio = bio;
576 spin_unlock_irq(&mddev->lock);
579 INIT_WORK(&mddev->flush_work, submit_flushes);
580 queue_work(md_wq, &mddev->flush_work);
582 /* flush was performed for some other bio while we waited. */
583 if (bio->bi_iter.bi_size == 0)
584 /* an empty barrier - all done */
587 bio->bi_opf &= ~REQ_PREFLUSH;
593 EXPORT_SYMBOL(md_flush_request);
595 static inline struct mddev *mddev_get(struct mddev *mddev)
597 atomic_inc(&mddev->active);
601 static void mddev_delayed_delete(struct work_struct *ws);
603 static void mddev_put(struct mddev *mddev)
605 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
607 if (!mddev->raid_disks && list_empty(&mddev->disks) &&
608 mddev->ctime == 0 && !mddev->hold_active) {
609 /* Array is not configured at all, and not held active,
611 list_del_init(&mddev->all_mddevs);
614 * Call queue_work inside the spinlock so that
615 * flush_workqueue() after mddev_find will succeed in waiting
616 * for the work to be done.
618 INIT_WORK(&mddev->del_work, mddev_delayed_delete);
619 queue_work(md_misc_wq, &mddev->del_work);
621 spin_unlock(&all_mddevs_lock);
624 static void md_safemode_timeout(struct timer_list *t);
626 void mddev_init(struct mddev *mddev)
628 kobject_init(&mddev->kobj, &md_ktype);
629 mutex_init(&mddev->open_mutex);
630 mutex_init(&mddev->reconfig_mutex);
631 mutex_init(&mddev->bitmap_info.mutex);
632 INIT_LIST_HEAD(&mddev->disks);
633 INIT_LIST_HEAD(&mddev->all_mddevs);
634 timer_setup(&mddev->safemode_timer, md_safemode_timeout, 0);
635 atomic_set(&mddev->active, 1);
636 atomic_set(&mddev->openers, 0);
637 atomic_set(&mddev->active_io, 0);
638 spin_lock_init(&mddev->lock);
639 atomic_set(&mddev->flush_pending, 0);
640 init_waitqueue_head(&mddev->sb_wait);
641 init_waitqueue_head(&mddev->recovery_wait);
642 mddev->reshape_position = MaxSector;
643 mddev->reshape_backwards = 0;
644 mddev->last_sync_action = "none";
645 mddev->resync_min = 0;
646 mddev->resync_max = MaxSector;
647 mddev->level = LEVEL_NONE;
649 EXPORT_SYMBOL_GPL(mddev_init);
651 static struct mddev *mddev_find_locked(dev_t unit)
655 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
656 if (mddev->unit == unit)
662 static struct mddev *mddev_find(dev_t unit)
666 if (MAJOR(unit) != MD_MAJOR)
667 unit &= ~((1 << MdpMinorShift) - 1);
669 spin_lock(&all_mddevs_lock);
670 mddev = mddev_find_locked(unit);
673 spin_unlock(&all_mddevs_lock);
678 static struct mddev *mddev_find_or_alloc(dev_t unit)
680 struct mddev *mddev, *new = NULL;
682 if (unit && MAJOR(unit) != MD_MAJOR)
683 unit &= ~((1<<MdpMinorShift)-1);
686 spin_lock(&all_mddevs_lock);
689 mddev = mddev_find_locked(unit);
692 spin_unlock(&all_mddevs_lock);
698 list_add(&new->all_mddevs, &all_mddevs);
699 spin_unlock(&all_mddevs_lock);
700 new->hold_active = UNTIL_IOCTL;
704 /* find an unused unit number */
705 static int next_minor = 512;
706 int start = next_minor;
710 dev = MKDEV(MD_MAJOR, next_minor);
712 if (next_minor > MINORMASK)
714 if (next_minor == start) {
715 /* Oh dear, all in use. */
716 spin_unlock(&all_mddevs_lock);
721 is_free = !mddev_find_locked(dev);
724 new->md_minor = MINOR(dev);
725 new->hold_active = UNTIL_STOP;
726 list_add(&new->all_mddevs, &all_mddevs);
727 spin_unlock(&all_mddevs_lock);
730 spin_unlock(&all_mddevs_lock);
732 new = kzalloc(sizeof(*new), GFP_KERNEL);
737 if (MAJOR(unit) == MD_MAJOR)
738 new->md_minor = MINOR(unit);
740 new->md_minor = MINOR(unit) >> MdpMinorShift;
747 static struct attribute_group md_redundancy_group;
749 void mddev_unlock(struct mddev *mddev)
751 if (mddev->to_remove) {
752 /* These cannot be removed under reconfig_mutex as
753 * an access to the files will try to take reconfig_mutex
754 * while holding the file unremovable, which leads to
756 * So hold set sysfs_active while the remove in happeing,
757 * and anything else which might set ->to_remove or my
758 * otherwise change the sysfs namespace will fail with
759 * -EBUSY if sysfs_active is still set.
760 * We set sysfs_active under reconfig_mutex and elsewhere
761 * test it under the same mutex to ensure its correct value
764 struct attribute_group *to_remove = mddev->to_remove;
765 mddev->to_remove = NULL;
766 mddev->sysfs_active = 1;
767 mutex_unlock(&mddev->reconfig_mutex);
769 if (mddev->kobj.sd) {
770 if (to_remove != &md_redundancy_group)
771 sysfs_remove_group(&mddev->kobj, to_remove);
772 if (mddev->pers == NULL ||
773 mddev->pers->sync_request == NULL) {
774 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
775 if (mddev->sysfs_action)
776 sysfs_put(mddev->sysfs_action);
777 mddev->sysfs_action = NULL;
780 mddev->sysfs_active = 0;
782 mutex_unlock(&mddev->reconfig_mutex);
784 /* As we've dropped the mutex we need a spinlock to
785 * make sure the thread doesn't disappear
787 spin_lock(&pers_lock);
788 md_wakeup_thread(mddev->thread);
789 wake_up(&mddev->sb_wait);
790 spin_unlock(&pers_lock);
792 EXPORT_SYMBOL_GPL(mddev_unlock);
794 struct md_rdev *md_find_rdev_nr_rcu(struct mddev *mddev, int nr)
796 struct md_rdev *rdev;
798 rdev_for_each_rcu(rdev, mddev)
799 if (rdev->desc_nr == nr)
804 EXPORT_SYMBOL_GPL(md_find_rdev_nr_rcu);
806 static struct md_rdev *find_rdev(struct mddev *mddev, dev_t dev)
808 struct md_rdev *rdev;
810 rdev_for_each(rdev, mddev)
811 if (rdev->bdev->bd_dev == dev)
817 struct md_rdev *md_find_rdev_rcu(struct mddev *mddev, dev_t dev)
819 struct md_rdev *rdev;
821 rdev_for_each_rcu(rdev, mddev)
822 if (rdev->bdev->bd_dev == dev)
827 EXPORT_SYMBOL_GPL(md_find_rdev_rcu);
829 static struct md_personality *find_pers(int level, char *clevel)
831 struct md_personality *pers;
832 list_for_each_entry(pers, &pers_list, list) {
833 if (level != LEVEL_NONE && pers->level == level)
835 if (strcmp(pers->name, clevel)==0)
841 /* return the offset of the super block in 512byte sectors */
842 static inline sector_t calc_dev_sboffset(struct md_rdev *rdev)
844 sector_t num_sectors = i_size_read(rdev->bdev->bd_inode) / 512;
845 return MD_NEW_SIZE_SECTORS(num_sectors);
848 static int alloc_disk_sb(struct md_rdev *rdev)
850 rdev->sb_page = alloc_page(GFP_KERNEL);
856 void md_rdev_clear(struct md_rdev *rdev)
859 put_page(rdev->sb_page);
861 rdev->sb_page = NULL;
866 put_page(rdev->bb_page);
867 rdev->bb_page = NULL;
869 badblocks_exit(&rdev->badblocks);
871 EXPORT_SYMBOL_GPL(md_rdev_clear);
873 static void super_written(struct bio *bio)
875 struct md_rdev *rdev = bio->bi_private;
876 struct mddev *mddev = rdev->mddev;
878 if (bio->bi_status) {
879 pr_err("md: super_written gets error=%d\n", bio->bi_status);
880 md_error(mddev, rdev);
881 if (!test_bit(Faulty, &rdev->flags)
882 && (bio->bi_opf & MD_FAILFAST)) {
883 set_bit(MD_SB_NEED_REWRITE, &mddev->sb_flags);
884 set_bit(LastDev, &rdev->flags);
887 clear_bit(LastDev, &rdev->flags);
891 rdev_dec_pending(rdev, mddev);
893 if (atomic_dec_and_test(&mddev->pending_writes))
894 wake_up(&mddev->sb_wait);
897 void md_super_write(struct mddev *mddev, struct md_rdev *rdev,
898 sector_t sector, int size, struct page *page)
900 /* write first size bytes of page to sector of rdev
901 * Increment mddev->pending_writes before returning
902 * and decrement it on completion, waking up sb_wait
903 * if zero is reached.
904 * If an error occurred, call md_error
912 if (test_bit(Faulty, &rdev->flags))
915 bio = md_bio_alloc_sync(mddev);
917 atomic_inc(&rdev->nr_pending);
919 bio_set_dev(bio, rdev->meta_bdev ? rdev->meta_bdev : rdev->bdev);
920 bio->bi_iter.bi_sector = sector;
921 bio_add_page(bio, page, size, 0);
922 bio->bi_private = rdev;
923 bio->bi_end_io = super_written;
925 if (test_bit(MD_FAILFAST_SUPPORTED, &mddev->flags) &&
926 test_bit(FailFast, &rdev->flags) &&
927 !test_bit(LastDev, &rdev->flags))
929 bio->bi_opf = REQ_OP_WRITE | REQ_SYNC | REQ_PREFLUSH | REQ_FUA | ff;
931 atomic_inc(&mddev->pending_writes);
935 int md_super_wait(struct mddev *mddev)
937 /* wait for all superblock writes that were scheduled to complete */
938 wait_event(mddev->sb_wait, atomic_read(&mddev->pending_writes)==0);
939 if (test_and_clear_bit(MD_SB_NEED_REWRITE, &mddev->sb_flags))
944 int sync_page_io(struct md_rdev *rdev, sector_t sector, int size,
945 struct page *page, int op, int op_flags, bool metadata_op)
947 struct bio *bio = md_bio_alloc_sync(rdev->mddev);
950 if (metadata_op && rdev->meta_bdev)
951 bio_set_dev(bio, rdev->meta_bdev);
953 bio_set_dev(bio, rdev->bdev);
954 bio_set_op_attrs(bio, op, op_flags);
956 bio->bi_iter.bi_sector = sector + rdev->sb_start;
957 else if (rdev->mddev->reshape_position != MaxSector &&
958 (rdev->mddev->reshape_backwards ==
959 (sector >= rdev->mddev->reshape_position)))
960 bio->bi_iter.bi_sector = sector + rdev->new_data_offset;
962 bio->bi_iter.bi_sector = sector + rdev->data_offset;
963 bio_add_page(bio, page, size, 0);
965 submit_bio_wait(bio);
967 ret = !bio->bi_status;
971 EXPORT_SYMBOL_GPL(sync_page_io);
973 static int read_disk_sb(struct md_rdev *rdev, int size)
975 char b[BDEVNAME_SIZE];
980 if (!sync_page_io(rdev, 0, size, rdev->sb_page, REQ_OP_READ, 0, true))
986 pr_err("md: disabled device %s, could not read superblock.\n",
987 bdevname(rdev->bdev,b));
991 static int md_uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
993 return sb1->set_uuid0 == sb2->set_uuid0 &&
994 sb1->set_uuid1 == sb2->set_uuid1 &&
995 sb1->set_uuid2 == sb2->set_uuid2 &&
996 sb1->set_uuid3 == sb2->set_uuid3;
999 static int md_sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
1002 mdp_super_t *tmp1, *tmp2;
1004 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
1005 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
1007 if (!tmp1 || !tmp2) {
1016 * nr_disks is not constant
1021 ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0);
1028 static u32 md_csum_fold(u32 csum)
1030 csum = (csum & 0xffff) + (csum >> 16);
1031 return (csum & 0xffff) + (csum >> 16);
1034 static unsigned int calc_sb_csum(mdp_super_t *sb)
1037 u32 *sb32 = (u32*)sb;
1039 unsigned int disk_csum, csum;
1041 disk_csum = sb->sb_csum;
1044 for (i = 0; i < MD_SB_BYTES/4 ; i++)
1046 csum = (newcsum & 0xffffffff) + (newcsum>>32);
1049 /* This used to use csum_partial, which was wrong for several
1050 * reasons including that different results are returned on
1051 * different architectures. It isn't critical that we get exactly
1052 * the same return value as before (we always csum_fold before
1053 * testing, and that removes any differences). However as we
1054 * know that csum_partial always returned a 16bit value on
1055 * alphas, do a fold to maximise conformity to previous behaviour.
1057 sb->sb_csum = md_csum_fold(disk_csum);
1059 sb->sb_csum = disk_csum;
1065 * Handle superblock details.
1066 * We want to be able to handle multiple superblock formats
1067 * so we have a common interface to them all, and an array of
1068 * different handlers.
1069 * We rely on user-space to write the initial superblock, and support
1070 * reading and updating of superblocks.
1071 * Interface methods are:
1072 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version)
1073 * loads and validates a superblock on dev.
1074 * if refdev != NULL, compare superblocks on both devices
1076 * 0 - dev has a superblock that is compatible with refdev
1077 * 1 - dev has a superblock that is compatible and newer than refdev
1078 * so dev should be used as the refdev in future
1079 * -EINVAL superblock incompatible or invalid
1080 * -othererror e.g. -EIO
1082 * int validate_super(struct mddev *mddev, struct md_rdev *dev)
1083 * Verify that dev is acceptable into mddev.
1084 * The first time, mddev->raid_disks will be 0, and data from
1085 * dev should be merged in. Subsequent calls check that dev
1086 * is new enough. Return 0 or -EINVAL
1088 * void sync_super(struct mddev *mddev, struct md_rdev *dev)
1089 * Update the superblock for rdev with data in mddev
1090 * This does not write to disc.
1096 struct module *owner;
1097 int (*load_super)(struct md_rdev *rdev,
1098 struct md_rdev *refdev,
1100 int (*validate_super)(struct mddev *mddev,
1101 struct md_rdev *rdev);
1102 void (*sync_super)(struct mddev *mddev,
1103 struct md_rdev *rdev);
1104 unsigned long long (*rdev_size_change)(struct md_rdev *rdev,
1105 sector_t num_sectors);
1106 int (*allow_new_offset)(struct md_rdev *rdev,
1107 unsigned long long new_offset);
1111 * Check that the given mddev has no bitmap.
1113 * This function is called from the run method of all personalities that do not
1114 * support bitmaps. It prints an error message and returns non-zero if mddev
1115 * has a bitmap. Otherwise, it returns 0.
1118 int md_check_no_bitmap(struct mddev *mddev)
1120 if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset)
1122 pr_warn("%s: bitmaps are not supported for %s\n",
1123 mdname(mddev), mddev->pers->name);
1126 EXPORT_SYMBOL(md_check_no_bitmap);
1129 * load_super for 0.90.0
1131 static int super_90_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
1133 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1136 bool spare_disk = true;
1139 * Calculate the position of the superblock (512byte sectors),
1140 * it's at the end of the disk.
1142 * It also happens to be a multiple of 4Kb.
1144 rdev->sb_start = calc_dev_sboffset(rdev);
1146 ret = read_disk_sb(rdev, MD_SB_BYTES);
1152 bdevname(rdev->bdev, b);
1153 sb = page_address(rdev->sb_page);
1155 if (sb->md_magic != MD_SB_MAGIC) {
1156 pr_warn("md: invalid raid superblock magic on %s\n", b);
1160 if (sb->major_version != 0 ||
1161 sb->minor_version < 90 ||
1162 sb->minor_version > 91) {
1163 pr_warn("Bad version number %d.%d on %s\n",
1164 sb->major_version, sb->minor_version, b);
1168 if (sb->raid_disks <= 0)
1171 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
1172 pr_warn("md: invalid superblock checksum on %s\n", b);
1176 rdev->preferred_minor = sb->md_minor;
1177 rdev->data_offset = 0;
1178 rdev->new_data_offset = 0;
1179 rdev->sb_size = MD_SB_BYTES;
1180 rdev->badblocks.shift = -1;
1182 if (sb->level == LEVEL_MULTIPATH)
1185 rdev->desc_nr = sb->this_disk.number;
1187 /* not spare disk, or LEVEL_MULTIPATH */
1188 if (sb->level == LEVEL_MULTIPATH ||
1189 (rdev->desc_nr >= 0 &&
1190 rdev->desc_nr < MD_SB_DISKS &&
1191 sb->disks[rdev->desc_nr].state &
1192 ((1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE))))
1202 mdp_super_t *refsb = page_address(refdev->sb_page);
1203 if (!md_uuid_equal(refsb, sb)) {
1204 pr_warn("md: %s has different UUID to %s\n",
1205 b, bdevname(refdev->bdev,b2));
1208 if (!md_sb_equal(refsb, sb)) {
1209 pr_warn("md: %s has same UUID but different superblock to %s\n",
1210 b, bdevname(refdev->bdev, b2));
1214 ev2 = md_event(refsb);
1216 if (!spare_disk && ev1 > ev2)
1221 rdev->sectors = rdev->sb_start;
1222 /* Limit to 4TB as metadata cannot record more than that.
1223 * (not needed for Linear and RAID0 as metadata doesn't
1226 if ((u64)rdev->sectors >= (2ULL << 32) && sb->level >= 1)
1227 rdev->sectors = (sector_t)(2ULL << 32) - 2;
1229 if (rdev->sectors < ((sector_t)sb->size) * 2 && sb->level >= 1)
1230 /* "this cannot possibly happen" ... */
1238 * validate_super for 0.90.0
1240 static int super_90_validate(struct mddev *mddev, struct md_rdev *rdev)
1243 mdp_super_t *sb = page_address(rdev->sb_page);
1244 __u64 ev1 = md_event(sb);
1246 rdev->raid_disk = -1;
1247 clear_bit(Faulty, &rdev->flags);
1248 clear_bit(In_sync, &rdev->flags);
1249 clear_bit(Bitmap_sync, &rdev->flags);
1250 clear_bit(WriteMostly, &rdev->flags);
1252 if (mddev->raid_disks == 0) {
1253 mddev->major_version = 0;
1254 mddev->minor_version = sb->minor_version;
1255 mddev->patch_version = sb->patch_version;
1256 mddev->external = 0;
1257 mddev->chunk_sectors = sb->chunk_size >> 9;
1258 mddev->ctime = sb->ctime;
1259 mddev->utime = sb->utime;
1260 mddev->level = sb->level;
1261 mddev->clevel[0] = 0;
1262 mddev->layout = sb->layout;
1263 mddev->raid_disks = sb->raid_disks;
1264 mddev->dev_sectors = ((sector_t)sb->size) * 2;
1265 mddev->events = ev1;
1266 mddev->bitmap_info.offset = 0;
1267 mddev->bitmap_info.space = 0;
1268 /* bitmap can use 60 K after the 4K superblocks */
1269 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
1270 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
1271 mddev->reshape_backwards = 0;
1273 if (mddev->minor_version >= 91) {
1274 mddev->reshape_position = sb->reshape_position;
1275 mddev->delta_disks = sb->delta_disks;
1276 mddev->new_level = sb->new_level;
1277 mddev->new_layout = sb->new_layout;
1278 mddev->new_chunk_sectors = sb->new_chunk >> 9;
1279 if (mddev->delta_disks < 0)
1280 mddev->reshape_backwards = 1;
1282 mddev->reshape_position = MaxSector;
1283 mddev->delta_disks = 0;
1284 mddev->new_level = mddev->level;
1285 mddev->new_layout = mddev->layout;
1286 mddev->new_chunk_sectors = mddev->chunk_sectors;
1288 if (mddev->level == 0)
1291 if (sb->state & (1<<MD_SB_CLEAN))
1292 mddev->recovery_cp = MaxSector;
1294 if (sb->events_hi == sb->cp_events_hi &&
1295 sb->events_lo == sb->cp_events_lo) {
1296 mddev->recovery_cp = sb->recovery_cp;
1298 mddev->recovery_cp = 0;
1301 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
1302 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
1303 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
1304 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
1306 mddev->max_disks = MD_SB_DISKS;
1308 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
1309 mddev->bitmap_info.file == NULL) {
1310 mddev->bitmap_info.offset =
1311 mddev->bitmap_info.default_offset;
1312 mddev->bitmap_info.space =
1313 mddev->bitmap_info.default_space;
1316 } else if (mddev->pers == NULL) {
1317 /* Insist on good event counter while assembling, except
1318 * for spares (which don't need an event count) */
1320 if (sb->disks[rdev->desc_nr].state & (
1321 (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE)))
1322 if (ev1 < mddev->events)
1324 } else if (mddev->bitmap) {
1325 /* if adding to array with a bitmap, then we can accept an
1326 * older device ... but not too old.
1328 if (ev1 < mddev->bitmap->events_cleared)
1330 if (ev1 < mddev->events)
1331 set_bit(Bitmap_sync, &rdev->flags);
1333 if (ev1 < mddev->events)
1334 /* just a hot-add of a new device, leave raid_disk at -1 */
1338 if (mddev->level != LEVEL_MULTIPATH) {
1339 desc = sb->disks + rdev->desc_nr;
1341 if (desc->state & (1<<MD_DISK_FAULTY))
1342 set_bit(Faulty, &rdev->flags);
1343 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
1344 desc->raid_disk < mddev->raid_disks */) {
1345 set_bit(In_sync, &rdev->flags);
1346 rdev->raid_disk = desc->raid_disk;
1347 rdev->saved_raid_disk = desc->raid_disk;
1348 } else if (desc->state & (1<<MD_DISK_ACTIVE)) {
1349 /* active but not in sync implies recovery up to
1350 * reshape position. We don't know exactly where
1351 * that is, so set to zero for now */
1352 if (mddev->minor_version >= 91) {
1353 rdev->recovery_offset = 0;
1354 rdev->raid_disk = desc->raid_disk;
1357 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
1358 set_bit(WriteMostly, &rdev->flags);
1359 if (desc->state & (1<<MD_DISK_FAILFAST))
1360 set_bit(FailFast, &rdev->flags);
1361 } else /* MULTIPATH are always insync */
1362 set_bit(In_sync, &rdev->flags);
1367 * sync_super for 0.90.0
1369 static void super_90_sync(struct mddev *mddev, struct md_rdev *rdev)
1372 struct md_rdev *rdev2;
1373 int next_spare = mddev->raid_disks;
1375 /* make rdev->sb match mddev data..
1378 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1379 * 3/ any empty disks < next_spare become removed
1381 * disks[0] gets initialised to REMOVED because
1382 * we cannot be sure from other fields if it has
1383 * been initialised or not.
1386 int active=0, working=0,failed=0,spare=0,nr_disks=0;
1388 rdev->sb_size = MD_SB_BYTES;
1390 sb = page_address(rdev->sb_page);
1392 memset(sb, 0, sizeof(*sb));
1394 sb->md_magic = MD_SB_MAGIC;
1395 sb->major_version = mddev->major_version;
1396 sb->patch_version = mddev->patch_version;
1397 sb->gvalid_words = 0; /* ignored */
1398 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
1399 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
1400 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
1401 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
1403 sb->ctime = clamp_t(time64_t, mddev->ctime, 0, U32_MAX);
1404 sb->level = mddev->level;
1405 sb->size = mddev->dev_sectors / 2;
1406 sb->raid_disks = mddev->raid_disks;
1407 sb->md_minor = mddev->md_minor;
1408 sb->not_persistent = 0;
1409 sb->utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX);
1411 sb->events_hi = (mddev->events>>32);
1412 sb->events_lo = (u32)mddev->events;
1414 if (mddev->reshape_position == MaxSector)
1415 sb->minor_version = 90;
1417 sb->minor_version = 91;
1418 sb->reshape_position = mddev->reshape_position;
1419 sb->new_level = mddev->new_level;
1420 sb->delta_disks = mddev->delta_disks;
1421 sb->new_layout = mddev->new_layout;
1422 sb->new_chunk = mddev->new_chunk_sectors << 9;
1424 mddev->minor_version = sb->minor_version;
1427 sb->recovery_cp = mddev->recovery_cp;
1428 sb->cp_events_hi = (mddev->events>>32);
1429 sb->cp_events_lo = (u32)mddev->events;
1430 if (mddev->recovery_cp == MaxSector)
1431 sb->state = (1<< MD_SB_CLEAN);
1433 sb->recovery_cp = 0;
1435 sb->layout = mddev->layout;
1436 sb->chunk_size = mddev->chunk_sectors << 9;
1438 if (mddev->bitmap && mddev->bitmap_info.file == NULL)
1439 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
1441 sb->disks[0].state = (1<<MD_DISK_REMOVED);
1442 rdev_for_each(rdev2, mddev) {
1445 int is_active = test_bit(In_sync, &rdev2->flags);
1447 if (rdev2->raid_disk >= 0 &&
1448 sb->minor_version >= 91)
1449 /* we have nowhere to store the recovery_offset,
1450 * but if it is not below the reshape_position,
1451 * we can piggy-back on that.
1454 if (rdev2->raid_disk < 0 ||
1455 test_bit(Faulty, &rdev2->flags))
1458 desc_nr = rdev2->raid_disk;
1460 desc_nr = next_spare++;
1461 rdev2->desc_nr = desc_nr;
1462 d = &sb->disks[rdev2->desc_nr];
1464 d->number = rdev2->desc_nr;
1465 d->major = MAJOR(rdev2->bdev->bd_dev);
1466 d->minor = MINOR(rdev2->bdev->bd_dev);
1468 d->raid_disk = rdev2->raid_disk;
1470 d->raid_disk = rdev2->desc_nr; /* compatibility */
1471 if (test_bit(Faulty, &rdev2->flags))
1472 d->state = (1<<MD_DISK_FAULTY);
1473 else if (is_active) {
1474 d->state = (1<<MD_DISK_ACTIVE);
1475 if (test_bit(In_sync, &rdev2->flags))
1476 d->state |= (1<<MD_DISK_SYNC);
1484 if (test_bit(WriteMostly, &rdev2->flags))
1485 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1486 if (test_bit(FailFast, &rdev2->flags))
1487 d->state |= (1<<MD_DISK_FAILFAST);
1489 /* now set the "removed" and "faulty" bits on any missing devices */
1490 for (i=0 ; i < mddev->raid_disks ; i++) {
1491 mdp_disk_t *d = &sb->disks[i];
1492 if (d->state == 0 && d->number == 0) {
1495 d->state = (1<<MD_DISK_REMOVED);
1496 d->state |= (1<<MD_DISK_FAULTY);
1500 sb->nr_disks = nr_disks;
1501 sb->active_disks = active;
1502 sb->working_disks = working;
1503 sb->failed_disks = failed;
1504 sb->spare_disks = spare;
1506 sb->this_disk = sb->disks[rdev->desc_nr];
1507 sb->sb_csum = calc_sb_csum(sb);
1511 * rdev_size_change for 0.90.0
1513 static unsigned long long
1514 super_90_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
1516 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1517 return 0; /* component must fit device */
1518 if (rdev->mddev->bitmap_info.offset)
1519 return 0; /* can't move bitmap */
1520 rdev->sb_start = calc_dev_sboffset(rdev);
1521 if (!num_sectors || num_sectors > rdev->sb_start)
1522 num_sectors = rdev->sb_start;
1523 /* Limit to 4TB as metadata cannot record more than that.
1524 * 4TB == 2^32 KB, or 2*2^32 sectors.
1526 if ((u64)num_sectors >= (2ULL << 32) && rdev->mddev->level >= 1)
1527 num_sectors = (sector_t)(2ULL << 32) - 2;
1529 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1531 } while (md_super_wait(rdev->mddev) < 0);
1536 super_90_allow_new_offset(struct md_rdev *rdev, unsigned long long new_offset)
1538 /* non-zero offset changes not possible with v0.90 */
1539 return new_offset == 0;
1543 * version 1 superblock
1546 static __le32 calc_sb_1_csum(struct mdp_superblock_1 *sb)
1550 unsigned long long newcsum;
1551 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1552 __le32 *isuper = (__le32*)sb;
1554 disk_csum = sb->sb_csum;
1557 for (; size >= 4; size -= 4)
1558 newcsum += le32_to_cpu(*isuper++);
1561 newcsum += le16_to_cpu(*(__le16*) isuper);
1563 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1564 sb->sb_csum = disk_csum;
1565 return cpu_to_le32(csum);
1568 static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
1570 struct mdp_superblock_1 *sb;
1574 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1576 bool spare_disk = true;
1579 * Calculate the position of the superblock in 512byte sectors.
1580 * It is always aligned to a 4K boundary and
1581 * depeding on minor_version, it can be:
1582 * 0: At least 8K, but less than 12K, from end of device
1583 * 1: At start of device
1584 * 2: 4K from start of device.
1586 switch(minor_version) {
1588 sb_start = i_size_read(rdev->bdev->bd_inode) >> 9;
1590 sb_start &= ~(sector_t)(4*2-1);
1601 rdev->sb_start = sb_start;
1603 /* superblock is rarely larger than 1K, but it can be larger,
1604 * and it is safe to read 4k, so we do that
1606 ret = read_disk_sb(rdev, 4096);
1607 if (ret) return ret;
1609 sb = page_address(rdev->sb_page);
1611 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1612 sb->major_version != cpu_to_le32(1) ||
1613 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1614 le64_to_cpu(sb->super_offset) != rdev->sb_start ||
1615 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1618 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1619 pr_warn("md: invalid superblock checksum on %s\n",
1620 bdevname(rdev->bdev,b));
1623 if (le64_to_cpu(sb->data_size) < 10) {
1624 pr_warn("md: data_size too small on %s\n",
1625 bdevname(rdev->bdev,b));
1630 memcmp(sb->pad3, sb->pad3+1, sizeof(sb->pad3) - sizeof(sb->pad3[1])))
1631 /* Some padding is non-zero, might be a new feature */
1634 rdev->preferred_minor = 0xffff;
1635 rdev->data_offset = le64_to_cpu(sb->data_offset);
1636 rdev->new_data_offset = rdev->data_offset;
1637 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE) &&
1638 (le32_to_cpu(sb->feature_map) & MD_FEATURE_NEW_OFFSET))
1639 rdev->new_data_offset += (s32)le32_to_cpu(sb->new_offset);
1640 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1642 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1643 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1644 if (rdev->sb_size & bmask)
1645 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1648 && rdev->data_offset < sb_start + (rdev->sb_size/512))
1651 && rdev->new_data_offset < sb_start + (rdev->sb_size/512))
1654 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1657 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1659 if (!rdev->bb_page) {
1660 rdev->bb_page = alloc_page(GFP_KERNEL);
1664 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BAD_BLOCKS) &&
1665 rdev->badblocks.count == 0) {
1666 /* need to load the bad block list.
1667 * Currently we limit it to one page.
1673 int sectors = le16_to_cpu(sb->bblog_size);
1674 if (sectors > (PAGE_SIZE / 512))
1676 offset = le32_to_cpu(sb->bblog_offset);
1679 bb_sector = (long long)offset;
1680 if (!sync_page_io(rdev, bb_sector, sectors << 9,
1681 rdev->bb_page, REQ_OP_READ, 0, true))
1683 bbp = (__le64 *)page_address(rdev->bb_page);
1684 rdev->badblocks.shift = sb->bblog_shift;
1685 for (i = 0 ; i < (sectors << (9-3)) ; i++, bbp++) {
1686 u64 bb = le64_to_cpu(*bbp);
1687 int count = bb & (0x3ff);
1688 u64 sector = bb >> 10;
1689 sector <<= sb->bblog_shift;
1690 count <<= sb->bblog_shift;
1693 if (badblocks_set(&rdev->badblocks, sector, count, 1))
1696 } else if (sb->bblog_offset != 0)
1697 rdev->badblocks.shift = 0;
1699 if ((le32_to_cpu(sb->feature_map) &
1700 (MD_FEATURE_PPL | MD_FEATURE_MULTIPLE_PPLS))) {
1701 rdev->ppl.offset = (__s16)le16_to_cpu(sb->ppl.offset);
1702 rdev->ppl.size = le16_to_cpu(sb->ppl.size);
1703 rdev->ppl.sector = rdev->sb_start + rdev->ppl.offset;
1706 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RAID0_LAYOUT) &&
1710 /* not spare disk, or LEVEL_MULTIPATH */
1711 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH) ||
1712 (rdev->desc_nr >= 0 &&
1713 rdev->desc_nr < le32_to_cpu(sb->max_dev) &&
1714 (le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < MD_DISK_ROLE_MAX ||
1715 le16_to_cpu(sb->dev_roles[rdev->desc_nr]) == MD_DISK_ROLE_JOURNAL)))
1725 struct mdp_superblock_1 *refsb = page_address(refdev->sb_page);
1727 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1728 sb->level != refsb->level ||
1729 sb->layout != refsb->layout ||
1730 sb->chunksize != refsb->chunksize) {
1731 pr_warn("md: %s has strangely different superblock to %s\n",
1732 bdevname(rdev->bdev,b),
1733 bdevname(refdev->bdev,b2));
1736 ev1 = le64_to_cpu(sb->events);
1737 ev2 = le64_to_cpu(refsb->events);
1739 if (!spare_disk && ev1 > ev2)
1744 if (minor_version) {
1745 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9);
1746 sectors -= rdev->data_offset;
1748 sectors = rdev->sb_start;
1749 if (sectors < le64_to_cpu(sb->data_size))
1751 rdev->sectors = le64_to_cpu(sb->data_size);
1755 static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev)
1757 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
1758 __u64 ev1 = le64_to_cpu(sb->events);
1760 rdev->raid_disk = -1;
1761 clear_bit(Faulty, &rdev->flags);
1762 clear_bit(In_sync, &rdev->flags);
1763 clear_bit(Bitmap_sync, &rdev->flags);
1764 clear_bit(WriteMostly, &rdev->flags);
1766 if (mddev->raid_disks == 0) {
1767 mddev->major_version = 1;
1768 mddev->patch_version = 0;
1769 mddev->external = 0;
1770 mddev->chunk_sectors = le32_to_cpu(sb->chunksize);
1771 mddev->ctime = le64_to_cpu(sb->ctime);
1772 mddev->utime = le64_to_cpu(sb->utime);
1773 mddev->level = le32_to_cpu(sb->level);
1774 mddev->clevel[0] = 0;
1775 mddev->layout = le32_to_cpu(sb->layout);
1776 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1777 mddev->dev_sectors = le64_to_cpu(sb->size);
1778 mddev->events = ev1;
1779 mddev->bitmap_info.offset = 0;
1780 mddev->bitmap_info.space = 0;
1781 /* Default location for bitmap is 1K after superblock
1782 * using 3K - total of 4K
1784 mddev->bitmap_info.default_offset = 1024 >> 9;
1785 mddev->bitmap_info.default_space = (4096-1024) >> 9;
1786 mddev->reshape_backwards = 0;
1788 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1789 memcpy(mddev->uuid, sb->set_uuid, 16);
1791 mddev->max_disks = (4096-256)/2;
1793 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1794 mddev->bitmap_info.file == NULL) {
1795 mddev->bitmap_info.offset =
1796 (__s32)le32_to_cpu(sb->bitmap_offset);
1797 /* Metadata doesn't record how much space is available.
1798 * For 1.0, we assume we can use up to the superblock
1799 * if before, else to 4K beyond superblock.
1800 * For others, assume no change is possible.
1802 if (mddev->minor_version > 0)
1803 mddev->bitmap_info.space = 0;
1804 else if (mddev->bitmap_info.offset > 0)
1805 mddev->bitmap_info.space =
1806 8 - mddev->bitmap_info.offset;
1808 mddev->bitmap_info.space =
1809 -mddev->bitmap_info.offset;
1812 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1813 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1814 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1815 mddev->new_level = le32_to_cpu(sb->new_level);
1816 mddev->new_layout = le32_to_cpu(sb->new_layout);
1817 mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk);
1818 if (mddev->delta_disks < 0 ||
1819 (mddev->delta_disks == 0 &&
1820 (le32_to_cpu(sb->feature_map)
1821 & MD_FEATURE_RESHAPE_BACKWARDS)))
1822 mddev->reshape_backwards = 1;
1824 mddev->reshape_position = MaxSector;
1825 mddev->delta_disks = 0;
1826 mddev->new_level = mddev->level;
1827 mddev->new_layout = mddev->layout;
1828 mddev->new_chunk_sectors = mddev->chunk_sectors;
1831 if (mddev->level == 0 &&
1832 !(le32_to_cpu(sb->feature_map) & MD_FEATURE_RAID0_LAYOUT))
1835 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL)
1836 set_bit(MD_HAS_JOURNAL, &mddev->flags);
1838 if (le32_to_cpu(sb->feature_map) &
1839 (MD_FEATURE_PPL | MD_FEATURE_MULTIPLE_PPLS)) {
1840 if (le32_to_cpu(sb->feature_map) &
1841 (MD_FEATURE_BITMAP_OFFSET | MD_FEATURE_JOURNAL))
1843 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_PPL) &&
1844 (le32_to_cpu(sb->feature_map) &
1845 MD_FEATURE_MULTIPLE_PPLS))
1847 set_bit(MD_HAS_PPL, &mddev->flags);
1849 } else if (mddev->pers == NULL) {
1850 /* Insist of good event counter while assembling, except for
1851 * spares (which don't need an event count) */
1853 if (rdev->desc_nr >= 0 &&
1854 rdev->desc_nr < le32_to_cpu(sb->max_dev) &&
1855 (le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < MD_DISK_ROLE_MAX ||
1856 le16_to_cpu(sb->dev_roles[rdev->desc_nr]) == MD_DISK_ROLE_JOURNAL))
1857 if (ev1 < mddev->events)
1859 } else if (mddev->bitmap) {
1860 /* If adding to array with a bitmap, then we can accept an
1861 * older device, but not too old.
1863 if (ev1 < mddev->bitmap->events_cleared)
1865 if (ev1 < mddev->events)
1866 set_bit(Bitmap_sync, &rdev->flags);
1868 if (ev1 < mddev->events)
1869 /* just a hot-add of a new device, leave raid_disk at -1 */
1872 if (mddev->level != LEVEL_MULTIPATH) {
1874 if (rdev->desc_nr < 0 ||
1875 rdev->desc_nr >= le32_to_cpu(sb->max_dev)) {
1876 role = MD_DISK_ROLE_SPARE;
1879 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1881 case MD_DISK_ROLE_SPARE: /* spare */
1883 case MD_DISK_ROLE_FAULTY: /* faulty */
1884 set_bit(Faulty, &rdev->flags);
1886 case MD_DISK_ROLE_JOURNAL: /* journal device */
1887 if (!(le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL)) {
1888 /* journal device without journal feature */
1889 pr_warn("md: journal device provided without journal feature, ignoring the device\n");
1892 set_bit(Journal, &rdev->flags);
1893 rdev->journal_tail = le64_to_cpu(sb->journal_tail);
1894 rdev->raid_disk = 0;
1897 rdev->saved_raid_disk = role;
1898 if ((le32_to_cpu(sb->feature_map) &
1899 MD_FEATURE_RECOVERY_OFFSET)) {
1900 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1901 if (!(le32_to_cpu(sb->feature_map) &
1902 MD_FEATURE_RECOVERY_BITMAP))
1903 rdev->saved_raid_disk = -1;
1906 * If the array is FROZEN, then the device can't
1907 * be in_sync with rest of array.
1909 if (!test_bit(MD_RECOVERY_FROZEN,
1911 set_bit(In_sync, &rdev->flags);
1913 rdev->raid_disk = role;
1916 if (sb->devflags & WriteMostly1)
1917 set_bit(WriteMostly, &rdev->flags);
1918 if (sb->devflags & FailFast1)
1919 set_bit(FailFast, &rdev->flags);
1920 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_REPLACEMENT)
1921 set_bit(Replacement, &rdev->flags);
1922 } else /* MULTIPATH are always insync */
1923 set_bit(In_sync, &rdev->flags);
1928 static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev)
1930 struct mdp_superblock_1 *sb;
1931 struct md_rdev *rdev2;
1933 /* make rdev->sb match mddev and rdev data. */
1935 sb = page_address(rdev->sb_page);
1937 sb->feature_map = 0;
1939 sb->recovery_offset = cpu_to_le64(0);
1940 memset(sb->pad3, 0, sizeof(sb->pad3));
1942 sb->utime = cpu_to_le64((__u64)mddev->utime);
1943 sb->events = cpu_to_le64(mddev->events);
1945 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1946 else if (test_bit(MD_JOURNAL_CLEAN, &mddev->flags))
1947 sb->resync_offset = cpu_to_le64(MaxSector);
1949 sb->resync_offset = cpu_to_le64(0);
1951 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
1953 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
1954 sb->size = cpu_to_le64(mddev->dev_sectors);
1955 sb->chunksize = cpu_to_le32(mddev->chunk_sectors);
1956 sb->level = cpu_to_le32(mddev->level);
1957 sb->layout = cpu_to_le32(mddev->layout);
1958 if (test_bit(FailFast, &rdev->flags))
1959 sb->devflags |= FailFast1;
1961 sb->devflags &= ~FailFast1;
1963 if (test_bit(WriteMostly, &rdev->flags))
1964 sb->devflags |= WriteMostly1;
1966 sb->devflags &= ~WriteMostly1;
1967 sb->data_offset = cpu_to_le64(rdev->data_offset);
1968 sb->data_size = cpu_to_le64(rdev->sectors);
1970 if (mddev->bitmap && mddev->bitmap_info.file == NULL) {
1971 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset);
1972 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
1975 if (rdev->raid_disk >= 0 && !test_bit(Journal, &rdev->flags) &&
1976 !test_bit(In_sync, &rdev->flags)) {
1978 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1979 sb->recovery_offset =
1980 cpu_to_le64(rdev->recovery_offset);
1981 if (rdev->saved_raid_disk >= 0 && mddev->bitmap)
1983 cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP);
1985 /* Note: recovery_offset and journal_tail share space */
1986 if (test_bit(Journal, &rdev->flags))
1987 sb->journal_tail = cpu_to_le64(rdev->journal_tail);
1988 if (test_bit(Replacement, &rdev->flags))
1990 cpu_to_le32(MD_FEATURE_REPLACEMENT);
1992 if (mddev->reshape_position != MaxSector) {
1993 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1994 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1995 sb->new_layout = cpu_to_le32(mddev->new_layout);
1996 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1997 sb->new_level = cpu_to_le32(mddev->new_level);
1998 sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors);
1999 if (mddev->delta_disks == 0 &&
2000 mddev->reshape_backwards)
2002 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS);
2003 if (rdev->new_data_offset != rdev->data_offset) {
2005 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET);
2006 sb->new_offset = cpu_to_le32((__u32)(rdev->new_data_offset
2007 - rdev->data_offset));
2011 if (mddev_is_clustered(mddev))
2012 sb->feature_map |= cpu_to_le32(MD_FEATURE_CLUSTERED);
2014 if (rdev->badblocks.count == 0)
2015 /* Nothing to do for bad blocks*/ ;
2016 else if (sb->bblog_offset == 0)
2017 /* Cannot record bad blocks on this device */
2018 md_error(mddev, rdev);
2020 struct badblocks *bb = &rdev->badblocks;
2021 __le64 *bbp = (__le64 *)page_address(rdev->bb_page);
2023 sb->feature_map |= cpu_to_le32(MD_FEATURE_BAD_BLOCKS);
2028 seq = read_seqbegin(&bb->lock);
2030 memset(bbp, 0xff, PAGE_SIZE);
2032 for (i = 0 ; i < bb->count ; i++) {
2033 u64 internal_bb = p[i];
2034 u64 store_bb = ((BB_OFFSET(internal_bb) << 10)
2035 | BB_LEN(internal_bb));
2036 bbp[i] = cpu_to_le64(store_bb);
2039 if (read_seqretry(&bb->lock, seq))
2042 bb->sector = (rdev->sb_start +
2043 (int)le32_to_cpu(sb->bblog_offset));
2044 bb->size = le16_to_cpu(sb->bblog_size);
2049 rdev_for_each(rdev2, mddev)
2050 if (rdev2->desc_nr+1 > max_dev)
2051 max_dev = rdev2->desc_nr+1;
2053 if (max_dev > le32_to_cpu(sb->max_dev)) {
2055 sb->max_dev = cpu_to_le32(max_dev);
2056 rdev->sb_size = max_dev * 2 + 256;
2057 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
2058 if (rdev->sb_size & bmask)
2059 rdev->sb_size = (rdev->sb_size | bmask) + 1;
2061 max_dev = le32_to_cpu(sb->max_dev);
2063 for (i=0; i<max_dev;i++)
2064 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_SPARE);
2066 if (test_bit(MD_HAS_JOURNAL, &mddev->flags))
2067 sb->feature_map |= cpu_to_le32(MD_FEATURE_JOURNAL);
2069 if (test_bit(MD_HAS_PPL, &mddev->flags)) {
2070 if (test_bit(MD_HAS_MULTIPLE_PPLS, &mddev->flags))
2072 cpu_to_le32(MD_FEATURE_MULTIPLE_PPLS);
2074 sb->feature_map |= cpu_to_le32(MD_FEATURE_PPL);
2075 sb->ppl.offset = cpu_to_le16(rdev->ppl.offset);
2076 sb->ppl.size = cpu_to_le16(rdev->ppl.size);
2079 rdev_for_each(rdev2, mddev) {
2081 if (test_bit(Faulty, &rdev2->flags))
2082 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_FAULTY);
2083 else if (test_bit(In_sync, &rdev2->flags))
2084 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
2085 else if (test_bit(Journal, &rdev2->flags))
2086 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_JOURNAL);
2087 else if (rdev2->raid_disk >= 0)
2088 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
2090 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_SPARE);
2093 sb->sb_csum = calc_sb_1_csum(sb);
2096 static unsigned long long
2097 super_1_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
2099 struct mdp_superblock_1 *sb;
2100 sector_t max_sectors;
2101 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
2102 return 0; /* component must fit device */
2103 if (rdev->data_offset != rdev->new_data_offset)
2104 return 0; /* too confusing */
2105 if (rdev->sb_start < rdev->data_offset) {
2106 /* minor versions 1 and 2; superblock before data */
2107 max_sectors = i_size_read(rdev->bdev->bd_inode) >> 9;
2108 max_sectors -= rdev->data_offset;
2109 if (!num_sectors || num_sectors > max_sectors)
2110 num_sectors = max_sectors;
2111 } else if (rdev->mddev->bitmap_info.offset) {
2112 /* minor version 0 with bitmap we can't move */
2115 /* minor version 0; superblock after data */
2117 sb_start = (i_size_read(rdev->bdev->bd_inode) >> 9) - 8*2;
2118 sb_start &= ~(sector_t)(4*2 - 1);
2119 max_sectors = rdev->sectors + sb_start - rdev->sb_start;
2120 if (!num_sectors || num_sectors > max_sectors)
2121 num_sectors = max_sectors;
2122 rdev->sb_start = sb_start;
2124 sb = page_address(rdev->sb_page);
2125 sb->data_size = cpu_to_le64(num_sectors);
2126 sb->super_offset = cpu_to_le64(rdev->sb_start);
2127 sb->sb_csum = calc_sb_1_csum(sb);
2129 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
2131 } while (md_super_wait(rdev->mddev) < 0);
2137 super_1_allow_new_offset(struct md_rdev *rdev,
2138 unsigned long long new_offset)
2140 /* All necessary checks on new >= old have been done */
2141 struct bitmap *bitmap;
2142 if (new_offset >= rdev->data_offset)
2145 /* with 1.0 metadata, there is no metadata to tread on
2146 * so we can always move back */
2147 if (rdev->mddev->minor_version == 0)
2150 /* otherwise we must be sure not to step on
2151 * any metadata, so stay:
2152 * 36K beyond start of superblock
2153 * beyond end of badblocks
2154 * beyond write-intent bitmap
2156 if (rdev->sb_start + (32+4)*2 > new_offset)
2158 bitmap = rdev->mddev->bitmap;
2159 if (bitmap && !rdev->mddev->bitmap_info.file &&
2160 rdev->sb_start + rdev->mddev->bitmap_info.offset +
2161 bitmap->storage.file_pages * (PAGE_SIZE>>9) > new_offset)
2163 if (rdev->badblocks.sector + rdev->badblocks.size > new_offset)
2169 static struct super_type super_types[] = {
2172 .owner = THIS_MODULE,
2173 .load_super = super_90_load,
2174 .validate_super = super_90_validate,
2175 .sync_super = super_90_sync,
2176 .rdev_size_change = super_90_rdev_size_change,
2177 .allow_new_offset = super_90_allow_new_offset,
2181 .owner = THIS_MODULE,
2182 .load_super = super_1_load,
2183 .validate_super = super_1_validate,
2184 .sync_super = super_1_sync,
2185 .rdev_size_change = super_1_rdev_size_change,
2186 .allow_new_offset = super_1_allow_new_offset,
2190 static void sync_super(struct mddev *mddev, struct md_rdev *rdev)
2192 if (mddev->sync_super) {
2193 mddev->sync_super(mddev, rdev);
2197 BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types));
2199 super_types[mddev->major_version].sync_super(mddev, rdev);
2202 static int match_mddev_units(struct mddev *mddev1, struct mddev *mddev2)
2204 struct md_rdev *rdev, *rdev2;
2207 rdev_for_each_rcu(rdev, mddev1) {
2208 if (test_bit(Faulty, &rdev->flags) ||
2209 test_bit(Journal, &rdev->flags) ||
2210 rdev->raid_disk == -1)
2212 rdev_for_each_rcu(rdev2, mddev2) {
2213 if (test_bit(Faulty, &rdev2->flags) ||
2214 test_bit(Journal, &rdev2->flags) ||
2215 rdev2->raid_disk == -1)
2217 if (rdev->bdev->bd_contains ==
2218 rdev2->bdev->bd_contains) {
2228 static LIST_HEAD(pending_raid_disks);
2231 * Try to register data integrity profile for an mddev
2233 * This is called when an array is started and after a disk has been kicked
2234 * from the array. It only succeeds if all working and active component devices
2235 * are integrity capable with matching profiles.
2237 int md_integrity_register(struct mddev *mddev)
2239 struct md_rdev *rdev, *reference = NULL;
2241 if (list_empty(&mddev->disks))
2242 return 0; /* nothing to do */
2243 if (!mddev->gendisk || blk_get_integrity(mddev->gendisk))
2244 return 0; /* shouldn't register, or already is */
2245 rdev_for_each(rdev, mddev) {
2246 /* skip spares and non-functional disks */
2247 if (test_bit(Faulty, &rdev->flags))
2249 if (rdev->raid_disk < 0)
2252 /* Use the first rdev as the reference */
2256 /* does this rdev's profile match the reference profile? */
2257 if (blk_integrity_compare(reference->bdev->bd_disk,
2258 rdev->bdev->bd_disk) < 0)
2261 if (!reference || !bdev_get_integrity(reference->bdev))
2264 * All component devices are integrity capable and have matching
2265 * profiles, register the common profile for the md device.
2267 blk_integrity_register(mddev->gendisk,
2268 bdev_get_integrity(reference->bdev));
2270 pr_debug("md: data integrity enabled on %s\n", mdname(mddev));
2271 if (bioset_integrity_create(&mddev->bio_set, BIO_POOL_SIZE)) {
2272 pr_err("md: failed to create integrity pool for %s\n",
2278 EXPORT_SYMBOL(md_integrity_register);
2281 * Attempt to add an rdev, but only if it is consistent with the current
2284 int md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev)
2286 struct blk_integrity *bi_mddev;
2287 char name[BDEVNAME_SIZE];
2289 if (!mddev->gendisk)
2292 bi_mddev = blk_get_integrity(mddev->gendisk);
2294 if (!bi_mddev) /* nothing to do */
2297 if (blk_integrity_compare(mddev->gendisk, rdev->bdev->bd_disk) != 0) {
2298 pr_err("%s: incompatible integrity profile for %s\n",
2299 mdname(mddev), bdevname(rdev->bdev, name));
2305 EXPORT_SYMBOL(md_integrity_add_rdev);
2307 static int bind_rdev_to_array(struct md_rdev *rdev, struct mddev *mddev)
2309 char b[BDEVNAME_SIZE];
2313 /* prevent duplicates */
2314 if (find_rdev(mddev, rdev->bdev->bd_dev))
2317 if ((bdev_read_only(rdev->bdev) || bdev_read_only(rdev->meta_bdev)) &&
2321 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2322 if (!test_bit(Journal, &rdev->flags) &&
2324 (mddev->dev_sectors == 0 || rdev->sectors < mddev->dev_sectors)) {
2326 /* Cannot change size, so fail
2327 * If mddev->level <= 0, then we don't care
2328 * about aligning sizes (e.g. linear)
2330 if (mddev->level > 0)
2333 mddev->dev_sectors = rdev->sectors;
2336 /* Verify rdev->desc_nr is unique.
2337 * If it is -1, assign a free number, else
2338 * check number is not in use
2341 if (rdev->desc_nr < 0) {
2344 choice = mddev->raid_disks;
2345 while (md_find_rdev_nr_rcu(mddev, choice))
2347 rdev->desc_nr = choice;
2349 if (md_find_rdev_nr_rcu(mddev, rdev->desc_nr)) {
2355 if (!test_bit(Journal, &rdev->flags) &&
2356 mddev->max_disks && rdev->desc_nr >= mddev->max_disks) {
2357 pr_warn("md: %s: array is limited to %d devices\n",
2358 mdname(mddev), mddev->max_disks);
2361 bdevname(rdev->bdev,b);
2362 strreplace(b, '/', '!');
2364 rdev->mddev = mddev;
2365 pr_debug("md: bind<%s>\n", b);
2367 if (mddev->raid_disks)
2368 mddev_create_wb_pool(mddev, rdev, false);
2370 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
2373 ko = &part_to_dev(rdev->bdev->bd_part)->kobj;
2374 if (sysfs_create_link(&rdev->kobj, ko, "block"))
2375 /* failure here is OK */;
2376 rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state");
2378 list_add_rcu(&rdev->same_set, &mddev->disks);
2379 bd_link_disk_holder(rdev->bdev, mddev->gendisk);
2381 /* May as well allow recovery to be retried once */
2382 mddev->recovery_disabled++;
2387 pr_warn("md: failed to register dev-%s for %s\n",
2392 static void md_delayed_delete(struct work_struct *ws)
2394 struct md_rdev *rdev = container_of(ws, struct md_rdev, del_work);
2395 kobject_del(&rdev->kobj);
2396 kobject_put(&rdev->kobj);
2399 static void unbind_rdev_from_array(struct md_rdev *rdev)
2401 char b[BDEVNAME_SIZE];
2403 bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk);
2404 list_del_rcu(&rdev->same_set);
2405 pr_debug("md: unbind<%s>\n", bdevname(rdev->bdev,b));
2406 mddev_destroy_wb_pool(rdev->mddev, rdev);
2408 sysfs_remove_link(&rdev->kobj, "block");
2409 sysfs_put(rdev->sysfs_state);
2410 rdev->sysfs_state = NULL;
2411 rdev->badblocks.count = 0;
2412 /* We need to delay this, otherwise we can deadlock when
2413 * writing to 'remove' to "dev/state". We also need
2414 * to delay it due to rcu usage.
2417 INIT_WORK(&rdev->del_work, md_delayed_delete);
2418 kobject_get(&rdev->kobj);
2419 queue_work(md_misc_wq, &rdev->del_work);
2423 * prevent the device from being mounted, repartitioned or
2424 * otherwise reused by a RAID array (or any other kernel
2425 * subsystem), by bd_claiming the device.
2427 static int lock_rdev(struct md_rdev *rdev, dev_t dev, int shared)
2430 struct block_device *bdev;
2431 char b[BDEVNAME_SIZE];
2433 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
2434 shared ? (struct md_rdev *)lock_rdev : rdev);
2436 pr_warn("md: could not open %s.\n", __bdevname(dev, b));
2437 return PTR_ERR(bdev);
2443 static void unlock_rdev(struct md_rdev *rdev)
2445 struct block_device *bdev = rdev->bdev;
2447 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
2450 void md_autodetect_dev(dev_t dev);
2452 static void export_rdev(struct md_rdev *rdev)
2454 char b[BDEVNAME_SIZE];
2456 pr_debug("md: export_rdev(%s)\n", bdevname(rdev->bdev,b));
2457 md_rdev_clear(rdev);
2459 if (test_bit(AutoDetected, &rdev->flags))
2460 md_autodetect_dev(rdev->bdev->bd_dev);
2463 kobject_put(&rdev->kobj);
2466 void md_kick_rdev_from_array(struct md_rdev *rdev)
2468 unbind_rdev_from_array(rdev);
2471 EXPORT_SYMBOL_GPL(md_kick_rdev_from_array);
2473 static void export_array(struct mddev *mddev)
2475 struct md_rdev *rdev;
2477 while (!list_empty(&mddev->disks)) {
2478 rdev = list_first_entry(&mddev->disks, struct md_rdev,
2480 md_kick_rdev_from_array(rdev);
2482 mddev->raid_disks = 0;
2483 mddev->major_version = 0;
2486 static bool set_in_sync(struct mddev *mddev)
2488 lockdep_assert_held(&mddev->lock);
2489 if (!mddev->in_sync) {
2490 mddev->sync_checkers++;
2491 spin_unlock(&mddev->lock);
2492 percpu_ref_switch_to_atomic_sync(&mddev->writes_pending);
2493 spin_lock(&mddev->lock);
2494 if (!mddev->in_sync &&
2495 percpu_ref_is_zero(&mddev->writes_pending)) {
2498 * Ensure ->in_sync is visible before we clear
2502 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
2503 sysfs_notify_dirent_safe(mddev->sysfs_state);
2505 if (--mddev->sync_checkers == 0)
2506 percpu_ref_switch_to_percpu(&mddev->writes_pending);
2508 if (mddev->safemode == 1)
2509 mddev->safemode = 0;
2510 return mddev->in_sync;
2513 static void sync_sbs(struct mddev *mddev, int nospares)
2515 /* Update each superblock (in-memory image), but
2516 * if we are allowed to, skip spares which already
2517 * have the right event counter, or have one earlier
2518 * (which would mean they aren't being marked as dirty
2519 * with the rest of the array)
2521 struct md_rdev *rdev;
2522 rdev_for_each(rdev, mddev) {
2523 if (rdev->sb_events == mddev->events ||
2525 rdev->raid_disk < 0 &&
2526 rdev->sb_events+1 == mddev->events)) {
2527 /* Don't update this superblock */
2528 rdev->sb_loaded = 2;
2530 sync_super(mddev, rdev);
2531 rdev->sb_loaded = 1;
2536 static bool does_sb_need_changing(struct mddev *mddev)
2538 struct md_rdev *rdev = NULL, *iter;
2539 struct mdp_superblock_1 *sb;
2542 /* Find a good rdev */
2543 rdev_for_each(iter, mddev)
2544 if ((iter->raid_disk >= 0) && !test_bit(Faulty, &iter->flags)) {
2549 /* No good device found. */
2553 sb = page_address(rdev->sb_page);
2554 /* Check if a device has become faulty or a spare become active */
2555 rdev_for_each(rdev, mddev) {
2556 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
2557 /* Device activated? */
2558 if (role == 0xffff && rdev->raid_disk >=0 &&
2559 !test_bit(Faulty, &rdev->flags))
2561 /* Device turned faulty? */
2562 if (test_bit(Faulty, &rdev->flags) && (role < 0xfffd))
2566 /* Check if any mddev parameters have changed */
2567 if ((mddev->dev_sectors != le64_to_cpu(sb->size)) ||
2568 (mddev->reshape_position != le64_to_cpu(sb->reshape_position)) ||
2569 (mddev->layout != le32_to_cpu(sb->layout)) ||
2570 (mddev->raid_disks != le32_to_cpu(sb->raid_disks)) ||
2571 (mddev->chunk_sectors != le32_to_cpu(sb->chunksize)))
2577 void md_update_sb(struct mddev *mddev, int force_change)
2579 struct md_rdev *rdev;
2582 int any_badblocks_changed = 0;
2587 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2592 if (mddev_is_clustered(mddev)) {
2593 if (test_and_clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags))
2595 if (test_and_clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags))
2597 ret = md_cluster_ops->metadata_update_start(mddev);
2598 /* Has someone else has updated the sb */
2599 if (!does_sb_need_changing(mddev)) {
2601 md_cluster_ops->metadata_update_cancel(mddev);
2602 bit_clear_unless(&mddev->sb_flags, BIT(MD_SB_CHANGE_PENDING),
2603 BIT(MD_SB_CHANGE_DEVS) |
2604 BIT(MD_SB_CHANGE_CLEAN));
2610 * First make sure individual recovery_offsets are correct
2611 * curr_resync_completed can only be used during recovery.
2612 * During reshape/resync it might use array-addresses rather
2613 * that device addresses.
2615 rdev_for_each(rdev, mddev) {
2616 if (rdev->raid_disk >= 0 &&
2617 mddev->delta_disks >= 0 &&
2618 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
2619 test_bit(MD_RECOVERY_RECOVER, &mddev->recovery) &&
2620 !test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
2621 !test_bit(Journal, &rdev->flags) &&
2622 !test_bit(In_sync, &rdev->flags) &&
2623 mddev->curr_resync_completed > rdev->recovery_offset)
2624 rdev->recovery_offset = mddev->curr_resync_completed;
2627 if (!mddev->persistent) {
2628 clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
2629 clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2630 if (!mddev->external) {
2631 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
2632 rdev_for_each(rdev, mddev) {
2633 if (rdev->badblocks.changed) {
2634 rdev->badblocks.changed = 0;
2635 ack_all_badblocks(&rdev->badblocks);
2636 md_error(mddev, rdev);
2638 clear_bit(Blocked, &rdev->flags);
2639 clear_bit(BlockedBadBlocks, &rdev->flags);
2640 wake_up(&rdev->blocked_wait);
2643 wake_up(&mddev->sb_wait);
2647 spin_lock(&mddev->lock);
2649 mddev->utime = ktime_get_real_seconds();
2651 if (test_and_clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags))
2653 if (test_and_clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags))
2654 /* just a clean<-> dirty transition, possibly leave spares alone,
2655 * though if events isn't the right even/odd, we will have to do
2661 if (mddev->degraded)
2662 /* If the array is degraded, then skipping spares is both
2663 * dangerous and fairly pointless.
2664 * Dangerous because a device that was removed from the array
2665 * might have a event_count that still looks up-to-date,
2666 * so it can be re-added without a resync.
2667 * Pointless because if there are any spares to skip,
2668 * then a recovery will happen and soon that array won't
2669 * be degraded any more and the spare can go back to sleep then.
2673 sync_req = mddev->in_sync;
2675 /* If this is just a dirty<->clean transition, and the array is clean
2676 * and 'events' is odd, we can roll back to the previous clean state */
2678 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
2679 && mddev->can_decrease_events
2680 && mddev->events != 1) {
2682 mddev->can_decrease_events = 0;
2684 /* otherwise we have to go forward and ... */
2686 mddev->can_decrease_events = nospares;
2690 * This 64-bit counter should never wrap.
2691 * Either we are in around ~1 trillion A.C., assuming
2692 * 1 reboot per second, or we have a bug...
2694 WARN_ON(mddev->events == 0);
2696 rdev_for_each(rdev, mddev) {
2697 if (rdev->badblocks.changed)
2698 any_badblocks_changed++;
2699 if (test_bit(Faulty, &rdev->flags))
2700 set_bit(FaultRecorded, &rdev->flags);
2703 sync_sbs(mddev, nospares);
2704 spin_unlock(&mddev->lock);
2706 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2707 mdname(mddev), mddev->in_sync);
2710 blk_add_trace_msg(mddev->queue, "md md_update_sb");
2712 md_bitmap_update_sb(mddev->bitmap);
2713 rdev_for_each(rdev, mddev) {
2714 char b[BDEVNAME_SIZE];
2716 if (rdev->sb_loaded != 1)
2717 continue; /* no noise on spare devices */
2719 if (!test_bit(Faulty, &rdev->flags)) {
2720 md_super_write(mddev,rdev,
2721 rdev->sb_start, rdev->sb_size,
2723 pr_debug("md: (write) %s's sb offset: %llu\n",
2724 bdevname(rdev->bdev, b),
2725 (unsigned long long)rdev->sb_start);
2726 rdev->sb_events = mddev->events;
2727 if (rdev->badblocks.size) {
2728 md_super_write(mddev, rdev,
2729 rdev->badblocks.sector,
2730 rdev->badblocks.size << 9,
2732 rdev->badblocks.size = 0;
2736 pr_debug("md: %s (skipping faulty)\n",
2737 bdevname(rdev->bdev, b));
2739 if (mddev->level == LEVEL_MULTIPATH)
2740 /* only need to write one superblock... */
2743 if (md_super_wait(mddev) < 0)
2745 /* if there was a failure, MD_SB_CHANGE_DEVS was set, and we re-write super */
2747 if (mddev_is_clustered(mddev) && ret == 0)
2748 md_cluster_ops->metadata_update_finish(mddev);
2750 if (mddev->in_sync != sync_req ||
2751 !bit_clear_unless(&mddev->sb_flags, BIT(MD_SB_CHANGE_PENDING),
2752 BIT(MD_SB_CHANGE_DEVS) | BIT(MD_SB_CHANGE_CLEAN)))
2753 /* have to write it out again */
2755 wake_up(&mddev->sb_wait);
2756 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
2757 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
2759 rdev_for_each(rdev, mddev) {
2760 if (test_and_clear_bit(FaultRecorded, &rdev->flags))
2761 clear_bit(Blocked, &rdev->flags);
2763 if (any_badblocks_changed)
2764 ack_all_badblocks(&rdev->badblocks);
2765 clear_bit(BlockedBadBlocks, &rdev->flags);
2766 wake_up(&rdev->blocked_wait);
2769 EXPORT_SYMBOL(md_update_sb);
2771 static int add_bound_rdev(struct md_rdev *rdev)
2773 struct mddev *mddev = rdev->mddev;
2775 bool add_journal = test_bit(Journal, &rdev->flags);
2777 if (!mddev->pers->hot_remove_disk || add_journal) {
2778 /* If there is hot_add_disk but no hot_remove_disk
2779 * then added disks for geometry changes,
2780 * and should be added immediately.
2782 super_types[mddev->major_version].
2783 validate_super(mddev, rdev);
2785 mddev_suspend(mddev);
2786 err = mddev->pers->hot_add_disk(mddev, rdev);
2788 mddev_resume(mddev);
2790 md_kick_rdev_from_array(rdev);
2794 sysfs_notify_dirent_safe(rdev->sysfs_state);
2796 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2797 if (mddev->degraded)
2798 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
2799 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2800 md_new_event(mddev);
2801 md_wakeup_thread(mddev->thread);
2805 /* words written to sysfs files may, or may not, be \n terminated.
2806 * We want to accept with case. For this we use cmd_match.
2808 static int cmd_match(const char *cmd, const char *str)
2810 /* See if cmd, written into a sysfs file, matches
2811 * str. They must either be the same, or cmd can
2812 * have a trailing newline
2814 while (*cmd && *str && *cmd == *str) {
2825 struct rdev_sysfs_entry {
2826 struct attribute attr;
2827 ssize_t (*show)(struct md_rdev *, char *);
2828 ssize_t (*store)(struct md_rdev *, const char *, size_t);
2832 state_show(struct md_rdev *rdev, char *page)
2836 unsigned long flags = READ_ONCE(rdev->flags);
2838 if (test_bit(Faulty, &flags) ||
2839 (!test_bit(ExternalBbl, &flags) &&
2840 rdev->badblocks.unacked_exist))
2841 len += sprintf(page+len, "faulty%s", sep);
2842 if (test_bit(In_sync, &flags))
2843 len += sprintf(page+len, "in_sync%s", sep);
2844 if (test_bit(Journal, &flags))
2845 len += sprintf(page+len, "journal%s", sep);
2846 if (test_bit(WriteMostly, &flags))
2847 len += sprintf(page+len, "write_mostly%s", sep);
2848 if (test_bit(Blocked, &flags) ||
2849 (rdev->badblocks.unacked_exist
2850 && !test_bit(Faulty, &flags)))
2851 len += sprintf(page+len, "blocked%s", sep);
2852 if (!test_bit(Faulty, &flags) &&
2853 !test_bit(Journal, &flags) &&
2854 !test_bit(In_sync, &flags))
2855 len += sprintf(page+len, "spare%s", sep);
2856 if (test_bit(WriteErrorSeen, &flags))
2857 len += sprintf(page+len, "write_error%s", sep);
2858 if (test_bit(WantReplacement, &flags))
2859 len += sprintf(page+len, "want_replacement%s", sep);
2860 if (test_bit(Replacement, &flags))
2861 len += sprintf(page+len, "replacement%s", sep);
2862 if (test_bit(ExternalBbl, &flags))
2863 len += sprintf(page+len, "external_bbl%s", sep);
2864 if (test_bit(FailFast, &flags))
2865 len += sprintf(page+len, "failfast%s", sep);
2870 return len+sprintf(page+len, "\n");
2874 state_store(struct md_rdev *rdev, const char *buf, size_t len)
2877 * faulty - simulates an error
2878 * remove - disconnects the device
2879 * writemostly - sets write_mostly
2880 * -writemostly - clears write_mostly
2881 * blocked - sets the Blocked flags
2882 * -blocked - clears the Blocked and possibly simulates an error
2883 * insync - sets Insync providing device isn't active
2884 * -insync - clear Insync for a device with a slot assigned,
2885 * so that it gets rebuilt based on bitmap
2886 * write_error - sets WriteErrorSeen
2887 * -write_error - clears WriteErrorSeen
2888 * {,-}failfast - set/clear FailFast
2891 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
2892 md_error(rdev->mddev, rdev);
2893 if (test_bit(Faulty, &rdev->flags))
2897 } else if (cmd_match(buf, "remove")) {
2898 if (rdev->mddev->pers) {
2899 clear_bit(Blocked, &rdev->flags);
2900 remove_and_add_spares(rdev->mddev, rdev);
2902 if (rdev->raid_disk >= 0)
2905 struct mddev *mddev = rdev->mddev;
2907 if (mddev_is_clustered(mddev))
2908 err = md_cluster_ops->remove_disk(mddev, rdev);
2911 md_kick_rdev_from_array(rdev);
2913 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2914 md_wakeup_thread(mddev->thread);
2916 md_new_event(mddev);
2919 } else if (cmd_match(buf, "writemostly")) {
2920 set_bit(WriteMostly, &rdev->flags);
2921 mddev_create_wb_pool(rdev->mddev, rdev, false);
2923 } else if (cmd_match(buf, "-writemostly")) {
2924 mddev_destroy_wb_pool(rdev->mddev, rdev);
2925 clear_bit(WriteMostly, &rdev->flags);
2927 } else if (cmd_match(buf, "blocked")) {
2928 set_bit(Blocked, &rdev->flags);
2930 } else if (cmd_match(buf, "-blocked")) {
2931 if (!test_bit(Faulty, &rdev->flags) &&
2932 !test_bit(ExternalBbl, &rdev->flags) &&
2933 rdev->badblocks.unacked_exist) {
2934 /* metadata handler doesn't understand badblocks,
2935 * so we need to fail the device
2937 md_error(rdev->mddev, rdev);
2939 clear_bit(Blocked, &rdev->flags);
2940 clear_bit(BlockedBadBlocks, &rdev->flags);
2941 wake_up(&rdev->blocked_wait);
2942 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2943 md_wakeup_thread(rdev->mddev->thread);
2946 } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) {
2947 set_bit(In_sync, &rdev->flags);
2949 } else if (cmd_match(buf, "failfast")) {
2950 set_bit(FailFast, &rdev->flags);
2952 } else if (cmd_match(buf, "-failfast")) {
2953 clear_bit(FailFast, &rdev->flags);
2955 } else if (cmd_match(buf, "-insync") && rdev->raid_disk >= 0 &&
2956 !test_bit(Journal, &rdev->flags)) {
2957 if (rdev->mddev->pers == NULL) {
2958 clear_bit(In_sync, &rdev->flags);
2959 rdev->saved_raid_disk = rdev->raid_disk;
2960 rdev->raid_disk = -1;
2963 } else if (cmd_match(buf, "write_error")) {
2964 set_bit(WriteErrorSeen, &rdev->flags);
2966 } else if (cmd_match(buf, "-write_error")) {
2967 clear_bit(WriteErrorSeen, &rdev->flags);
2969 } else if (cmd_match(buf, "want_replacement")) {
2970 /* Any non-spare device that is not a replacement can
2971 * become want_replacement at any time, but we then need to
2972 * check if recovery is needed.
2974 if (rdev->raid_disk >= 0 &&
2975 !test_bit(Journal, &rdev->flags) &&
2976 !test_bit(Replacement, &rdev->flags))
2977 set_bit(WantReplacement, &rdev->flags);
2978 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2979 md_wakeup_thread(rdev->mddev->thread);
2981 } else if (cmd_match(buf, "-want_replacement")) {
2982 /* Clearing 'want_replacement' is always allowed.
2983 * Once replacements starts it is too late though.
2986 clear_bit(WantReplacement, &rdev->flags);
2987 } else if (cmd_match(buf, "replacement")) {
2988 /* Can only set a device as a replacement when array has not
2989 * yet been started. Once running, replacement is automatic
2990 * from spares, or by assigning 'slot'.
2992 if (rdev->mddev->pers)
2995 set_bit(Replacement, &rdev->flags);
2998 } else if (cmd_match(buf, "-replacement")) {
2999 /* Similarly, can only clear Replacement before start */
3000 if (rdev->mddev->pers)
3003 clear_bit(Replacement, &rdev->flags);
3006 } else if (cmd_match(buf, "re-add")) {
3007 if (!rdev->mddev->pers)
3009 else if (test_bit(Faulty, &rdev->flags) && (rdev->raid_disk == -1) &&
3010 rdev->saved_raid_disk >= 0) {
3011 /* clear_bit is performed _after_ all the devices
3012 * have their local Faulty bit cleared. If any writes
3013 * happen in the meantime in the local node, they
3014 * will land in the local bitmap, which will be synced
3015 * by this node eventually
3017 if (!mddev_is_clustered(rdev->mddev) ||
3018 (err = md_cluster_ops->gather_bitmaps(rdev)) == 0) {
3019 clear_bit(Faulty, &rdev->flags);
3020 err = add_bound_rdev(rdev);
3024 } else if (cmd_match(buf, "external_bbl") && (rdev->mddev->external)) {
3025 set_bit(ExternalBbl, &rdev->flags);
3026 rdev->badblocks.shift = 0;
3028 } else if (cmd_match(buf, "-external_bbl") && (rdev->mddev->external)) {
3029 clear_bit(ExternalBbl, &rdev->flags);
3033 sysfs_notify_dirent_safe(rdev->sysfs_state);
3034 return err ? err : len;
3036 static struct rdev_sysfs_entry rdev_state =
3037 __ATTR_PREALLOC(state, S_IRUGO|S_IWUSR, state_show, state_store);
3040 errors_show(struct md_rdev *rdev, char *page)
3042 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
3046 errors_store(struct md_rdev *rdev, const char *buf, size_t len)
3051 rv = kstrtouint(buf, 10, &n);
3054 atomic_set(&rdev->corrected_errors, n);
3057 static struct rdev_sysfs_entry rdev_errors =
3058 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
3061 slot_show(struct md_rdev *rdev, char *page)
3063 if (test_bit(Journal, &rdev->flags))
3064 return sprintf(page, "journal\n");
3065 else if (rdev->raid_disk < 0)
3066 return sprintf(page, "none\n");
3068 return sprintf(page, "%d\n", rdev->raid_disk);
3072 slot_store(struct md_rdev *rdev, const char *buf, size_t len)
3077 if (test_bit(Journal, &rdev->flags))
3079 if (strncmp(buf, "none", 4)==0)
3082 err = kstrtouint(buf, 10, (unsigned int *)&slot);
3089 if (rdev->mddev->pers && slot == -1) {
3090 /* Setting 'slot' on an active array requires also
3091 * updating the 'rd%d' link, and communicating
3092 * with the personality with ->hot_*_disk.
3093 * For now we only support removing
3094 * failed/spare devices. This normally happens automatically,
3095 * but not when the metadata is externally managed.
3097 if (rdev->raid_disk == -1)
3099 /* personality does all needed checks */
3100 if (rdev->mddev->pers->hot_remove_disk == NULL)
3102 clear_bit(Blocked, &rdev->flags);
3103 remove_and_add_spares(rdev->mddev, rdev);
3104 if (rdev->raid_disk >= 0)
3106 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
3107 md_wakeup_thread(rdev->mddev->thread);
3108 } else if (rdev->mddev->pers) {
3109 /* Activating a spare .. or possibly reactivating
3110 * if we ever get bitmaps working here.
3114 if (rdev->raid_disk != -1)
3117 if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery))
3120 if (rdev->mddev->pers->hot_add_disk == NULL)
3123 if (slot >= rdev->mddev->raid_disks &&
3124 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
3127 rdev->raid_disk = slot;
3128 if (test_bit(In_sync, &rdev->flags))
3129 rdev->saved_raid_disk = slot;
3131 rdev->saved_raid_disk = -1;
3132 clear_bit(In_sync, &rdev->flags);
3133 clear_bit(Bitmap_sync, &rdev->flags);
3134 err = rdev->mddev->pers->
3135 hot_add_disk(rdev->mddev, rdev);
3137 rdev->raid_disk = -1;
3140 sysfs_notify_dirent_safe(rdev->sysfs_state);
3141 if (sysfs_link_rdev(rdev->mddev, rdev))
3142 /* failure here is OK */;
3143 /* don't wakeup anyone, leave that to userspace. */
3145 if (slot >= rdev->mddev->raid_disks &&
3146 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
3148 rdev->raid_disk = slot;
3149 /* assume it is working */
3150 clear_bit(Faulty, &rdev->flags);
3151 clear_bit(WriteMostly, &rdev->flags);
3152 set_bit(In_sync, &rdev->flags);
3153 sysfs_notify_dirent_safe(rdev->sysfs_state);
3158 static struct rdev_sysfs_entry rdev_slot =
3159 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
3162 offset_show(struct md_rdev *rdev, char *page)
3164 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
3168 offset_store(struct md_rdev *rdev, const char *buf, size_t len)
3170 unsigned long long offset;
3171 if (kstrtoull(buf, 10, &offset) < 0)
3173 if (rdev->mddev->pers && rdev->raid_disk >= 0)
3175 if (rdev->sectors && rdev->mddev->external)
3176 /* Must set offset before size, so overlap checks
3179 rdev->data_offset = offset;
3180 rdev->new_data_offset = offset;
3184 static struct rdev_sysfs_entry rdev_offset =
3185 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
3187 static ssize_t new_offset_show(struct md_rdev *rdev, char *page)
3189 return sprintf(page, "%llu\n",
3190 (unsigned long long)rdev->new_data_offset);
3193 static ssize_t new_offset_store(struct md_rdev *rdev,
3194 const char *buf, size_t len)
3196 unsigned long long new_offset;
3197 struct mddev *mddev = rdev->mddev;
3199 if (kstrtoull(buf, 10, &new_offset) < 0)
3202 if (mddev->sync_thread ||
3203 test_bit(MD_RECOVERY_RUNNING,&mddev->recovery))
3205 if (new_offset == rdev->data_offset)
3206 /* reset is always permitted */
3208 else if (new_offset > rdev->data_offset) {
3209 /* must not push array size beyond rdev_sectors */
3210 if (new_offset - rdev->data_offset
3211 + mddev->dev_sectors > rdev->sectors)
3214 /* Metadata worries about other space details. */
3216 /* decreasing the offset is inconsistent with a backwards
3219 if (new_offset < rdev->data_offset &&
3220 mddev->reshape_backwards)
3222 /* Increasing offset is inconsistent with forwards
3223 * reshape. reshape_direction should be set to
3224 * 'backwards' first.
3226 if (new_offset > rdev->data_offset &&
3227 !mddev->reshape_backwards)
3230 if (mddev->pers && mddev->persistent &&
3231 !super_types[mddev->major_version]
3232 .allow_new_offset(rdev, new_offset))
3234 rdev->new_data_offset = new_offset;
3235 if (new_offset > rdev->data_offset)
3236 mddev->reshape_backwards = 1;
3237 else if (new_offset < rdev->data_offset)
3238 mddev->reshape_backwards = 0;
3242 static struct rdev_sysfs_entry rdev_new_offset =
3243 __ATTR(new_offset, S_IRUGO|S_IWUSR, new_offset_show, new_offset_store);
3246 rdev_size_show(struct md_rdev *rdev, char *page)
3248 return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2);
3251 static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
3253 /* check if two start/length pairs overlap */
3261 static int strict_blocks_to_sectors(const char *buf, sector_t *sectors)
3263 unsigned long long blocks;
3266 if (kstrtoull(buf, 10, &blocks) < 0)
3269 if (blocks & 1ULL << (8 * sizeof(blocks) - 1))
3270 return -EINVAL; /* sector conversion overflow */
3273 if (new != blocks * 2)
3274 return -EINVAL; /* unsigned long long to sector_t overflow */
3281 rdev_size_store(struct md_rdev *rdev, const char *buf, size_t len)
3283 struct mddev *my_mddev = rdev->mddev;
3284 sector_t oldsectors = rdev->sectors;
3287 if (test_bit(Journal, &rdev->flags))
3289 if (strict_blocks_to_sectors(buf, §ors) < 0)
3291 if (rdev->data_offset != rdev->new_data_offset)
3292 return -EINVAL; /* too confusing */
3293 if (my_mddev->pers && rdev->raid_disk >= 0) {
3294 if (my_mddev->persistent) {
3295 sectors = super_types[my_mddev->major_version].
3296 rdev_size_change(rdev, sectors);
3299 } else if (!sectors)
3300 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) -
3302 if (!my_mddev->pers->resize)
3303 /* Cannot change size for RAID0 or Linear etc */
3306 if (sectors < my_mddev->dev_sectors)
3307 return -EINVAL; /* component must fit device */
3309 rdev->sectors = sectors;
3310 if (sectors > oldsectors && my_mddev->external) {
3311 /* Need to check that all other rdevs with the same
3312 * ->bdev do not overlap. 'rcu' is sufficient to walk
3313 * the rdev lists safely.
3314 * This check does not provide a hard guarantee, it
3315 * just helps avoid dangerous mistakes.
3317 struct mddev *mddev;
3319 struct list_head *tmp;
3322 for_each_mddev(mddev, tmp) {
3323 struct md_rdev *rdev2;
3325 rdev_for_each(rdev2, mddev)
3326 if (rdev->bdev == rdev2->bdev &&
3328 overlaps(rdev->data_offset, rdev->sectors,
3341 /* Someone else could have slipped in a size
3342 * change here, but doing so is just silly.
3343 * We put oldsectors back because we *know* it is
3344 * safe, and trust userspace not to race with
3347 rdev->sectors = oldsectors;
3354 static struct rdev_sysfs_entry rdev_size =
3355 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
3357 static ssize_t recovery_start_show(struct md_rdev *rdev, char *page)
3359 unsigned long long recovery_start = rdev->recovery_offset;
3361 if (test_bit(In_sync, &rdev->flags) ||
3362 recovery_start == MaxSector)
3363 return sprintf(page, "none\n");
3365 return sprintf(page, "%llu\n", recovery_start);
3368 static ssize_t recovery_start_store(struct md_rdev *rdev, const char *buf, size_t len)
3370 unsigned long long recovery_start;
3372 if (cmd_match(buf, "none"))
3373 recovery_start = MaxSector;
3374 else if (kstrtoull(buf, 10, &recovery_start))
3377 if (rdev->mddev->pers &&
3378 rdev->raid_disk >= 0)
3381 rdev->recovery_offset = recovery_start;
3382 if (recovery_start == MaxSector)
3383 set_bit(In_sync, &rdev->flags);
3385 clear_bit(In_sync, &rdev->flags);
3389 static struct rdev_sysfs_entry rdev_recovery_start =
3390 __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store);
3392 /* sysfs access to bad-blocks list.
3393 * We present two files.
3394 * 'bad-blocks' lists sector numbers and lengths of ranges that
3395 * are recorded as bad. The list is truncated to fit within
3396 * the one-page limit of sysfs.
3397 * Writing "sector length" to this file adds an acknowledged
3399 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
3400 * been acknowledged. Writing to this file adds bad blocks
3401 * without acknowledging them. This is largely for testing.
3403 static ssize_t bb_show(struct md_rdev *rdev, char *page)
3405 return badblocks_show(&rdev->badblocks, page, 0);
3407 static ssize_t bb_store(struct md_rdev *rdev, const char *page, size_t len)
3409 int rv = badblocks_store(&rdev->badblocks, page, len, 0);
3410 /* Maybe that ack was all we needed */
3411 if (test_and_clear_bit(BlockedBadBlocks, &rdev->flags))
3412 wake_up(&rdev->blocked_wait);
3415 static struct rdev_sysfs_entry rdev_bad_blocks =
3416 __ATTR(bad_blocks, S_IRUGO|S_IWUSR, bb_show, bb_store);
3418 static ssize_t ubb_show(struct md_rdev *rdev, char *page)
3420 return badblocks_show(&rdev->badblocks, page, 1);
3422 static ssize_t ubb_store(struct md_rdev *rdev, const char *page, size_t len)
3424 return badblocks_store(&rdev->badblocks, page, len, 1);
3426 static struct rdev_sysfs_entry rdev_unack_bad_blocks =
3427 __ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store);
3430 ppl_sector_show(struct md_rdev *rdev, char *page)
3432 return sprintf(page, "%llu\n", (unsigned long long)rdev->ppl.sector);
3436 ppl_sector_store(struct md_rdev *rdev, const char *buf, size_t len)
3438 unsigned long long sector;
3440 if (kstrtoull(buf, 10, §or) < 0)
3442 if (sector != (sector_t)sector)
3445 if (rdev->mddev->pers && test_bit(MD_HAS_PPL, &rdev->mddev->flags) &&
3446 rdev->raid_disk >= 0)
3449 if (rdev->mddev->persistent) {
3450 if (rdev->mddev->major_version == 0)
3452 if ((sector > rdev->sb_start &&
3453 sector - rdev->sb_start > S16_MAX) ||
3454 (sector < rdev->sb_start &&
3455 rdev->sb_start - sector > -S16_MIN))
3457 rdev->ppl.offset = sector - rdev->sb_start;
3458 } else if (!rdev->mddev->external) {
3461 rdev->ppl.sector = sector;
3465 static struct rdev_sysfs_entry rdev_ppl_sector =
3466 __ATTR(ppl_sector, S_IRUGO|S_IWUSR, ppl_sector_show, ppl_sector_store);
3469 ppl_size_show(struct md_rdev *rdev, char *page)
3471 return sprintf(page, "%u\n", rdev->ppl.size);
3475 ppl_size_store(struct md_rdev *rdev, const char *buf, size_t len)
3479 if (kstrtouint(buf, 10, &size) < 0)
3482 if (rdev->mddev->pers && test_bit(MD_HAS_PPL, &rdev->mddev->flags) &&
3483 rdev->raid_disk >= 0)
3486 if (rdev->mddev->persistent) {
3487 if (rdev->mddev->major_version == 0)
3491 } else if (!rdev->mddev->external) {
3494 rdev->ppl.size = size;
3498 static struct rdev_sysfs_entry rdev_ppl_size =
3499 __ATTR(ppl_size, S_IRUGO|S_IWUSR, ppl_size_show, ppl_size_store);
3501 static struct attribute *rdev_default_attrs[] = {
3506 &rdev_new_offset.attr,
3508 &rdev_recovery_start.attr,
3509 &rdev_bad_blocks.attr,
3510 &rdev_unack_bad_blocks.attr,
3511 &rdev_ppl_sector.attr,
3512 &rdev_ppl_size.attr,
3516 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
3518 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3519 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3525 return entry->show(rdev, page);
3529 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
3530 const char *page, size_t length)
3532 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3533 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3535 struct mddev *mddev = rdev->mddev;
3539 if (!capable(CAP_SYS_ADMIN))
3541 rv = mddev ? mddev_lock(mddev) : -ENODEV;
3543 if (rdev->mddev == NULL)
3546 rv = entry->store(rdev, page, length);
3547 mddev_unlock(mddev);
3552 static void rdev_free(struct kobject *ko)
3554 struct md_rdev *rdev = container_of(ko, struct md_rdev, kobj);
3557 static const struct sysfs_ops rdev_sysfs_ops = {
3558 .show = rdev_attr_show,
3559 .store = rdev_attr_store,
3561 static struct kobj_type rdev_ktype = {
3562 .release = rdev_free,
3563 .sysfs_ops = &rdev_sysfs_ops,
3564 .default_attrs = rdev_default_attrs,
3567 int md_rdev_init(struct md_rdev *rdev)
3570 rdev->saved_raid_disk = -1;
3571 rdev->raid_disk = -1;
3573 rdev->data_offset = 0;
3574 rdev->new_data_offset = 0;
3575 rdev->sb_events = 0;
3576 rdev->last_read_error = 0;
3577 rdev->sb_loaded = 0;
3578 rdev->bb_page = NULL;
3579 atomic_set(&rdev->nr_pending, 0);
3580 atomic_set(&rdev->read_errors, 0);
3581 atomic_set(&rdev->corrected_errors, 0);
3583 INIT_LIST_HEAD(&rdev->same_set);
3584 init_waitqueue_head(&rdev->blocked_wait);
3586 /* Add space to store bad block list.
3587 * This reserves the space even on arrays where it cannot
3588 * be used - I wonder if that matters
3590 return badblocks_init(&rdev->badblocks, 0);
3592 EXPORT_SYMBOL_GPL(md_rdev_init);
3594 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3596 * mark the device faulty if:
3598 * - the device is nonexistent (zero size)
3599 * - the device has no valid superblock
3601 * a faulty rdev _never_ has rdev->sb set.
3603 static struct md_rdev *md_import_device(dev_t newdev, int super_format, int super_minor)
3605 char b[BDEVNAME_SIZE];
3607 struct md_rdev *rdev;
3610 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
3612 return ERR_PTR(-ENOMEM);
3614 err = md_rdev_init(rdev);
3617 err = alloc_disk_sb(rdev);
3621 err = lock_rdev(rdev, newdev, super_format == -2);
3625 kobject_init(&rdev->kobj, &rdev_ktype);
3627 size = i_size_read(rdev->bdev->bd_inode) >> BLOCK_SIZE_BITS;
3629 pr_warn("md: %s has zero or unknown size, marking faulty!\n",
3630 bdevname(rdev->bdev,b));
3635 if (super_format >= 0) {
3636 err = super_types[super_format].
3637 load_super(rdev, NULL, super_minor);
3638 if (err == -EINVAL) {
3639 pr_warn("md: %s does not have a valid v%d.%d superblock, not importing!\n",
3640 bdevname(rdev->bdev,b),
3641 super_format, super_minor);
3645 pr_warn("md: could not read %s's sb, not importing!\n",
3646 bdevname(rdev->bdev,b));
3656 md_rdev_clear(rdev);
3658 return ERR_PTR(err);
3662 * Check a full RAID array for plausibility
3665 static int analyze_sbs(struct mddev *mddev)
3668 struct md_rdev *rdev, *freshest, *tmp;
3669 char b[BDEVNAME_SIZE];
3672 rdev_for_each_safe(rdev, tmp, mddev)
3673 switch (super_types[mddev->major_version].
3674 load_super(rdev, freshest, mddev->minor_version)) {
3681 pr_warn("md: fatal superblock inconsistency in %s -- removing from array\n",
3682 bdevname(rdev->bdev,b));
3683 md_kick_rdev_from_array(rdev);
3686 /* Cannot find a valid fresh disk */
3688 pr_warn("md: cannot find a valid disk\n");
3692 super_types[mddev->major_version].
3693 validate_super(mddev, freshest);
3696 rdev_for_each_safe(rdev, tmp, mddev) {
3697 if (mddev->max_disks &&
3698 (rdev->desc_nr >= mddev->max_disks ||
3699 i > mddev->max_disks)) {
3700 pr_warn("md: %s: %s: only %d devices permitted\n",
3701 mdname(mddev), bdevname(rdev->bdev, b),
3703 md_kick_rdev_from_array(rdev);
3706 if (rdev != freshest) {
3707 if (super_types[mddev->major_version].
3708 validate_super(mddev, rdev)) {
3709 pr_warn("md: kicking non-fresh %s from array!\n",
3710 bdevname(rdev->bdev,b));
3711 md_kick_rdev_from_array(rdev);
3715 if (mddev->level == LEVEL_MULTIPATH) {
3716 rdev->desc_nr = i++;
3717 rdev->raid_disk = rdev->desc_nr;
3718 set_bit(In_sync, &rdev->flags);
3719 } else if (rdev->raid_disk >=
3720 (mddev->raid_disks - min(0, mddev->delta_disks)) &&
3721 !test_bit(Journal, &rdev->flags)) {
3722 rdev->raid_disk = -1;
3723 clear_bit(In_sync, &rdev->flags);
3730 /* Read a fixed-point number.
3731 * Numbers in sysfs attributes should be in "standard" units where
3732 * possible, so time should be in seconds.
3733 * However we internally use a a much smaller unit such as
3734 * milliseconds or jiffies.
3735 * This function takes a decimal number with a possible fractional
3736 * component, and produces an integer which is the result of
3737 * multiplying that number by 10^'scale'.
3738 * all without any floating-point arithmetic.
3740 int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale)
3742 unsigned long result = 0;
3744 while (isdigit(*cp) || (*cp == '.' && decimals < 0)) {
3747 else if (decimals < scale) {
3750 result = result * 10 + value;
3762 *res = result * int_pow(10, scale - decimals);
3767 safe_delay_show(struct mddev *mddev, char *page)
3769 int msec = (mddev->safemode_delay*1000)/HZ;
3770 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
3773 safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len)
3777 if (mddev_is_clustered(mddev)) {
3778 pr_warn("md: Safemode is disabled for clustered mode\n");
3782 if (strict_strtoul_scaled(cbuf, &msec, 3) < 0)
3785 mddev->safemode_delay = 0;
3787 unsigned long old_delay = mddev->safemode_delay;
3788 unsigned long new_delay = (msec*HZ)/1000;
3792 mddev->safemode_delay = new_delay;
3793 if (new_delay < old_delay || old_delay == 0)
3794 mod_timer(&mddev->safemode_timer, jiffies+1);
3798 static struct md_sysfs_entry md_safe_delay =
3799 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
3802 level_show(struct mddev *mddev, char *page)
3804 struct md_personality *p;
3806 spin_lock(&mddev->lock);
3809 ret = sprintf(page, "%s\n", p->name);
3810 else if (mddev->clevel[0])
3811 ret = sprintf(page, "%s\n", mddev->clevel);
3812 else if (mddev->level != LEVEL_NONE)
3813 ret = sprintf(page, "%d\n", mddev->level);
3816 spin_unlock(&mddev->lock);
3821 level_store(struct mddev *mddev, const char *buf, size_t len)
3826 struct md_personality *pers, *oldpers;
3828 void *priv, *oldpriv;
3829 struct md_rdev *rdev;
3831 if (slen == 0 || slen >= sizeof(clevel))
3834 rv = mddev_lock(mddev);
3838 if (mddev->pers == NULL) {
3839 strncpy(mddev->clevel, buf, slen);
3840 if (mddev->clevel[slen-1] == '\n')
3842 mddev->clevel[slen] = 0;
3843 mddev->level = LEVEL_NONE;
3851 /* request to change the personality. Need to ensure:
3852 * - array is not engaged in resync/recovery/reshape
3853 * - old personality can be suspended
3854 * - new personality will access other array.
3858 if (mddev->sync_thread ||
3859 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3860 mddev->reshape_position != MaxSector ||
3861 mddev->sysfs_active)
3865 if (!mddev->pers->quiesce) {
3866 pr_warn("md: %s: %s does not support online personality change\n",
3867 mdname(mddev), mddev->pers->name);
3871 /* Now find the new personality */
3872 strncpy(clevel, buf, slen);
3873 if (clevel[slen-1] == '\n')
3876 if (kstrtol(clevel, 10, &level))
3879 if (request_module("md-%s", clevel) != 0)
3880 request_module("md-level-%s", clevel);
3881 spin_lock(&pers_lock);
3882 pers = find_pers(level, clevel);
3883 if (!pers || !try_module_get(pers->owner)) {
3884 spin_unlock(&pers_lock);
3885 pr_warn("md: personality %s not loaded\n", clevel);
3889 spin_unlock(&pers_lock);
3891 if (pers == mddev->pers) {
3892 /* Nothing to do! */
3893 module_put(pers->owner);
3897 if (!pers->takeover) {
3898 module_put(pers->owner);
3899 pr_warn("md: %s: %s does not support personality takeover\n",
3900 mdname(mddev), clevel);
3905 rdev_for_each(rdev, mddev)
3906 rdev->new_raid_disk = rdev->raid_disk;
3908 /* ->takeover must set new_* and/or delta_disks
3909 * if it succeeds, and may set them when it fails.
3911 priv = pers->takeover(mddev);
3913 mddev->new_level = mddev->level;
3914 mddev->new_layout = mddev->layout;
3915 mddev->new_chunk_sectors = mddev->chunk_sectors;
3916 mddev->raid_disks -= mddev->delta_disks;
3917 mddev->delta_disks = 0;
3918 mddev->reshape_backwards = 0;
3919 module_put(pers->owner);
3920 pr_warn("md: %s: %s would not accept array\n",
3921 mdname(mddev), clevel);
3926 /* Looks like we have a winner */
3927 mddev_suspend(mddev);
3928 mddev_detach(mddev);
3930 spin_lock(&mddev->lock);
3931 oldpers = mddev->pers;
3932 oldpriv = mddev->private;
3934 mddev->private = priv;
3935 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
3936 mddev->level = mddev->new_level;
3937 mddev->layout = mddev->new_layout;
3938 mddev->chunk_sectors = mddev->new_chunk_sectors;
3939 mddev->delta_disks = 0;
3940 mddev->reshape_backwards = 0;
3941 mddev->degraded = 0;
3942 spin_unlock(&mddev->lock);
3944 if (oldpers->sync_request == NULL &&
3946 /* We are converting from a no-redundancy array
3947 * to a redundancy array and metadata is managed
3948 * externally so we need to be sure that writes
3949 * won't block due to a need to transition
3951 * until external management is started.
3954 mddev->safemode_delay = 0;
3955 mddev->safemode = 0;
3958 oldpers->free(mddev, oldpriv);
3960 if (oldpers->sync_request == NULL &&
3961 pers->sync_request != NULL) {
3962 /* need to add the md_redundancy_group */
3963 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
3964 pr_warn("md: cannot register extra attributes for %s\n",
3966 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action");
3968 if (oldpers->sync_request != NULL &&
3969 pers->sync_request == NULL) {
3970 /* need to remove the md_redundancy_group */
3971 if (mddev->to_remove == NULL)
3972 mddev->to_remove = &md_redundancy_group;
3975 module_put(oldpers->owner);
3977 rdev_for_each(rdev, mddev) {
3978 if (rdev->raid_disk < 0)
3980 if (rdev->new_raid_disk >= mddev->raid_disks)
3981 rdev->new_raid_disk = -1;
3982 if (rdev->new_raid_disk == rdev->raid_disk)
3984 sysfs_unlink_rdev(mddev, rdev);
3986 rdev_for_each(rdev, mddev) {
3987 if (rdev->raid_disk < 0)
3989 if (rdev->new_raid_disk == rdev->raid_disk)
3991 rdev->raid_disk = rdev->new_raid_disk;
3992 if (rdev->raid_disk < 0)
3993 clear_bit(In_sync, &rdev->flags);
3995 if (sysfs_link_rdev(mddev, rdev))
3996 pr_warn("md: cannot register rd%d for %s after level change\n",
3997 rdev->raid_disk, mdname(mddev));
4001 if (pers->sync_request == NULL) {
4002 /* this is now an array without redundancy, so
4003 * it must always be in_sync
4006 del_timer_sync(&mddev->safemode_timer);
4008 blk_set_stacking_limits(&mddev->queue->limits);
4010 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
4011 mddev_resume(mddev);
4013 md_update_sb(mddev, 1);
4014 sysfs_notify(&mddev->kobj, NULL, "level");
4015 md_new_event(mddev);
4018 mddev_unlock(mddev);
4022 static struct md_sysfs_entry md_level =
4023 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
4026 layout_show(struct mddev *mddev, char *page)
4028 /* just a number, not meaningful for all levels */
4029 if (mddev->reshape_position != MaxSector &&
4030 mddev->layout != mddev->new_layout)
4031 return sprintf(page, "%d (%d)\n",
4032 mddev->new_layout, mddev->layout);
4033 return sprintf(page, "%d\n", mddev->layout);
4037 layout_store(struct mddev *mddev, const char *buf, size_t len)
4042 err = kstrtouint(buf, 10, &n);
4045 err = mddev_lock(mddev);
4050 if (mddev->pers->check_reshape == NULL)
4055 mddev->new_layout = n;
4056 err = mddev->pers->check_reshape(mddev);
4058 mddev->new_layout = mddev->layout;
4061 mddev->new_layout = n;
4062 if (mddev->reshape_position == MaxSector)
4065 mddev_unlock(mddev);
4068 static struct md_sysfs_entry md_layout =
4069 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
4072 raid_disks_show(struct mddev *mddev, char *page)
4074 if (mddev->raid_disks == 0)
4076 if (mddev->reshape_position != MaxSector &&
4077 mddev->delta_disks != 0)
4078 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
4079 mddev->raid_disks - mddev->delta_disks);
4080 return sprintf(page, "%d\n", mddev->raid_disks);
4083 static int update_raid_disks(struct mddev *mddev, int raid_disks);
4086 raid_disks_store(struct mddev *mddev, const char *buf, size_t len)
4091 err = kstrtouint(buf, 10, &n);
4095 err = mddev_lock(mddev);
4099 err = update_raid_disks(mddev, n);
4100 else if (mddev->reshape_position != MaxSector) {
4101 struct md_rdev *rdev;
4102 int olddisks = mddev->raid_disks - mddev->delta_disks;
4105 rdev_for_each(rdev, mddev) {
4107 rdev->data_offset < rdev->new_data_offset)
4110 rdev->data_offset > rdev->new_data_offset)
4114 mddev->delta_disks = n - olddisks;
4115 mddev->raid_disks = n;
4116 mddev->reshape_backwards = (mddev->delta_disks < 0);
4118 mddev->raid_disks = n;
4120 mddev_unlock(mddev);
4121 return err ? err : len;
4123 static struct md_sysfs_entry md_raid_disks =
4124 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
4127 chunk_size_show(struct mddev *mddev, char *page)
4129 if (mddev->reshape_position != MaxSector &&
4130 mddev->chunk_sectors != mddev->new_chunk_sectors)
4131 return sprintf(page, "%d (%d)\n",
4132 mddev->new_chunk_sectors << 9,
4133 mddev->chunk_sectors << 9);
4134 return sprintf(page, "%d\n", mddev->chunk_sectors << 9);
4138 chunk_size_store(struct mddev *mddev, const char *buf, size_t len)
4143 err = kstrtoul(buf, 10, &n);
4147 err = mddev_lock(mddev);
4151 if (mddev->pers->check_reshape == NULL)
4156 mddev->new_chunk_sectors = n >> 9;
4157 err = mddev->pers->check_reshape(mddev);
4159 mddev->new_chunk_sectors = mddev->chunk_sectors;
4162 mddev->new_chunk_sectors = n >> 9;
4163 if (mddev->reshape_position == MaxSector)
4164 mddev->chunk_sectors = n >> 9;
4166 mddev_unlock(mddev);
4169 static struct md_sysfs_entry md_chunk_size =
4170 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
4173 resync_start_show(struct mddev *mddev, char *page)
4175 if (mddev->recovery_cp == MaxSector)
4176 return sprintf(page, "none\n");
4177 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
4181 resync_start_store(struct mddev *mddev, const char *buf, size_t len)
4183 unsigned long long n;
4186 if (cmd_match(buf, "none"))
4189 err = kstrtoull(buf, 10, &n);
4192 if (n != (sector_t)n)
4196 err = mddev_lock(mddev);
4199 if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
4203 mddev->recovery_cp = n;
4205 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
4207 mddev_unlock(mddev);
4210 static struct md_sysfs_entry md_resync_start =
4211 __ATTR_PREALLOC(resync_start, S_IRUGO|S_IWUSR,
4212 resync_start_show, resync_start_store);
4215 * The array state can be:
4218 * No devices, no size, no level
4219 * Equivalent to STOP_ARRAY ioctl
4221 * May have some settings, but array is not active
4222 * all IO results in error
4223 * When written, doesn't tear down array, but just stops it
4224 * suspended (not supported yet)
4225 * All IO requests will block. The array can be reconfigured.
4226 * Writing this, if accepted, will block until array is quiescent
4228 * no resync can happen. no superblocks get written.
4229 * write requests fail
4231 * like readonly, but behaves like 'clean' on a write request.
4233 * clean - no pending writes, but otherwise active.
4234 * When written to inactive array, starts without resync
4235 * If a write request arrives then
4236 * if metadata is known, mark 'dirty' and switch to 'active'.
4237 * if not known, block and switch to write-pending
4238 * If written to an active array that has pending writes, then fails.
4240 * fully active: IO and resync can be happening.
4241 * When written to inactive array, starts with resync
4244 * clean, but writes are blocked waiting for 'active' to be written.
4247 * like active, but no writes have been seen for a while (100msec).
4250 * RAID0/LINEAR-only: same as clean, but array is missing a member.
4251 * It's useful because RAID0/LINEAR mounted-arrays aren't stopped
4252 * when a member is gone, so this state will at least alert the
4253 * user that something is wrong.
4255 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
4256 write_pending, active_idle, broken, bad_word};
4257 static char *array_states[] = {
4258 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
4259 "write-pending", "active-idle", "broken", NULL };
4261 static int match_word(const char *word, char **list)
4264 for (n=0; list[n]; n++)
4265 if (cmd_match(word, list[n]))
4271 array_state_show(struct mddev *mddev, char *page)
4273 enum array_state st = inactive;
4275 if (mddev->pers && !test_bit(MD_NOT_READY, &mddev->flags)) {
4284 spin_lock(&mddev->lock);
4285 if (test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags))
4287 else if (mddev->in_sync)
4289 else if (mddev->safemode)
4293 spin_unlock(&mddev->lock);
4296 if (test_bit(MD_BROKEN, &mddev->flags) && st == clean)
4299 if (list_empty(&mddev->disks) &&
4300 mddev->raid_disks == 0 &&
4301 mddev->dev_sectors == 0)
4306 return sprintf(page, "%s\n", array_states[st]);
4309 static int do_md_stop(struct mddev *mddev, int ro, struct block_device *bdev);
4310 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev);
4311 static int do_md_run(struct mddev *mddev);
4312 static int restart_array(struct mddev *mddev);
4315 array_state_store(struct mddev *mddev, const char *buf, size_t len)
4318 enum array_state st = match_word(buf, array_states);
4320 if (mddev->pers && (st == active || st == clean) && mddev->ro != 1) {
4321 /* don't take reconfig_mutex when toggling between
4324 spin_lock(&mddev->lock);
4326 restart_array(mddev);
4327 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
4328 md_wakeup_thread(mddev->thread);
4329 wake_up(&mddev->sb_wait);
4330 } else /* st == clean */ {
4331 restart_array(mddev);
4332 if (!set_in_sync(mddev))
4336 sysfs_notify_dirent_safe(mddev->sysfs_state);
4337 spin_unlock(&mddev->lock);
4340 err = mddev_lock(mddev);
4348 /* stopping an active array */
4349 err = do_md_stop(mddev, 0, NULL);
4352 /* stopping an active array */
4354 err = do_md_stop(mddev, 2, NULL);
4356 err = 0; /* already inactive */
4359 break; /* not supported yet */
4362 err = md_set_readonly(mddev, NULL);
4365 set_disk_ro(mddev->gendisk, 1);
4366 err = do_md_run(mddev);
4372 err = md_set_readonly(mddev, NULL);
4373 else if (mddev->ro == 1)
4374 err = restart_array(mddev);
4377 set_disk_ro(mddev->gendisk, 0);
4381 err = do_md_run(mddev);
4386 err = restart_array(mddev);
4389 spin_lock(&mddev->lock);
4390 if (!set_in_sync(mddev))
4392 spin_unlock(&mddev->lock);
4398 err = restart_array(mddev);
4401 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
4402 wake_up(&mddev->sb_wait);
4406 set_disk_ro(mddev->gendisk, 0);
4407 err = do_md_run(mddev);
4413 /* these cannot be set */
4418 if (mddev->hold_active == UNTIL_IOCTL)
4419 mddev->hold_active = 0;
4420 sysfs_notify_dirent_safe(mddev->sysfs_state);
4422 mddev_unlock(mddev);
4425 static struct md_sysfs_entry md_array_state =
4426 __ATTR_PREALLOC(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
4429 max_corrected_read_errors_show(struct mddev *mddev, char *page) {
4430 return sprintf(page, "%d\n",
4431 atomic_read(&mddev->max_corr_read_errors));
4435 max_corrected_read_errors_store(struct mddev *mddev, const char *buf, size_t len)
4440 rv = kstrtouint(buf, 10, &n);
4443 atomic_set(&mddev->max_corr_read_errors, n);
4447 static struct md_sysfs_entry max_corr_read_errors =
4448 __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show,
4449 max_corrected_read_errors_store);
4452 null_show(struct mddev *mddev, char *page)
4458 new_dev_store(struct mddev *mddev, const char *buf, size_t len)
4460 /* buf must be %d:%d\n? giving major and minor numbers */
4461 /* The new device is added to the array.
4462 * If the array has a persistent superblock, we read the
4463 * superblock to initialise info and check validity.
4464 * Otherwise, only checking done is that in bind_rdev_to_array,
4465 * which mainly checks size.
4468 int major = simple_strtoul(buf, &e, 10);
4471 struct md_rdev *rdev;
4474 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
4476 minor = simple_strtoul(e+1, &e, 10);
4477 if (*e && *e != '\n')
4479 dev = MKDEV(major, minor);
4480 if (major != MAJOR(dev) ||
4481 minor != MINOR(dev))
4484 flush_workqueue(md_misc_wq);
4486 err = mddev_lock(mddev);
4489 if (mddev->persistent) {
4490 rdev = md_import_device(dev, mddev->major_version,
4491 mddev->minor_version);
4492 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
4493 struct md_rdev *rdev0
4494 = list_entry(mddev->disks.next,
4495 struct md_rdev, same_set);
4496 err = super_types[mddev->major_version]
4497 .load_super(rdev, rdev0, mddev->minor_version);
4501 } else if (mddev->external)
4502 rdev = md_import_device(dev, -2, -1);
4504 rdev = md_import_device(dev, -1, -1);
4507 mddev_unlock(mddev);
4508 return PTR_ERR(rdev);
4510 err = bind_rdev_to_array(rdev, mddev);
4514 mddev_unlock(mddev);
4516 md_new_event(mddev);
4517 return err ? err : len;
4520 static struct md_sysfs_entry md_new_device =
4521 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
4524 bitmap_store(struct mddev *mddev, const char *buf, size_t len)
4527 unsigned long chunk, end_chunk;
4530 err = mddev_lock(mddev);
4535 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
4537 chunk = end_chunk = simple_strtoul(buf, &end, 0);
4538 if (buf == end) break;
4539 if (*end == '-') { /* range */
4541 end_chunk = simple_strtoul(buf, &end, 0);
4542 if (buf == end) break;
4544 if (*end && !isspace(*end)) break;
4545 md_bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
4546 buf = skip_spaces(end);
4548 md_bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
4550 mddev_unlock(mddev);
4554 static struct md_sysfs_entry md_bitmap =
4555 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
4558 size_show(struct mddev *mddev, char *page)
4560 return sprintf(page, "%llu\n",
4561 (unsigned long long)mddev->dev_sectors / 2);
4564 static int update_size(struct mddev *mddev, sector_t num_sectors);
4567 size_store(struct mddev *mddev, const char *buf, size_t len)
4569 /* If array is inactive, we can reduce the component size, but
4570 * not increase it (except from 0).
4571 * If array is active, we can try an on-line resize
4574 int err = strict_blocks_to_sectors(buf, §ors);
4578 err = mddev_lock(mddev);
4582 err = update_size(mddev, sectors);
4584 md_update_sb(mddev, 1);
4586 if (mddev->dev_sectors == 0 ||
4587 mddev->dev_sectors > sectors)
4588 mddev->dev_sectors = sectors;
4592 mddev_unlock(mddev);
4593 return err ? err : len;
4596 static struct md_sysfs_entry md_size =
4597 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
4599 /* Metadata version.
4601 * 'none' for arrays with no metadata (good luck...)
4602 * 'external' for arrays with externally managed metadata,
4603 * or N.M for internally known formats
4606 metadata_show(struct mddev *mddev, char *page)
4608 if (mddev->persistent)
4609 return sprintf(page, "%d.%d\n",
4610 mddev->major_version, mddev->minor_version);
4611 else if (mddev->external)
4612 return sprintf(page, "external:%s\n", mddev->metadata_type);
4614 return sprintf(page, "none\n");
4618 metadata_store(struct mddev *mddev, const char *buf, size_t len)
4623 /* Changing the details of 'external' metadata is
4624 * always permitted. Otherwise there must be
4625 * no devices attached to the array.
4628 err = mddev_lock(mddev);
4632 if (mddev->external && strncmp(buf, "external:", 9) == 0)
4634 else if (!list_empty(&mddev->disks))
4638 if (cmd_match(buf, "none")) {
4639 mddev->persistent = 0;
4640 mddev->external = 0;
4641 mddev->major_version = 0;
4642 mddev->minor_version = 90;
4645 if (strncmp(buf, "external:", 9) == 0) {
4646 size_t namelen = len-9;
4647 if (namelen >= sizeof(mddev->metadata_type))
4648 namelen = sizeof(mddev->metadata_type)-1;
4649 strncpy(mddev->metadata_type, buf+9, namelen);
4650 mddev->metadata_type[namelen] = 0;
4651 if (namelen && mddev->metadata_type[namelen-1] == '\n')
4652 mddev->metadata_type[--namelen] = 0;
4653 mddev->persistent = 0;
4654 mddev->external = 1;
4655 mddev->major_version = 0;
4656 mddev->minor_version = 90;
4659 major = simple_strtoul(buf, &e, 10);
4661 if (e==buf || *e != '.')
4664 minor = simple_strtoul(buf, &e, 10);
4665 if (e==buf || (*e && *e != '\n') )
4668 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
4670 mddev->major_version = major;
4671 mddev->minor_version = minor;
4672 mddev->persistent = 1;
4673 mddev->external = 0;
4676 mddev_unlock(mddev);
4680 static struct md_sysfs_entry md_metadata =
4681 __ATTR_PREALLOC(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
4684 action_show(struct mddev *mddev, char *page)
4686 char *type = "idle";
4687 unsigned long recovery = mddev->recovery;
4688 if (test_bit(MD_RECOVERY_FROZEN, &recovery))
4690 else if (test_bit(MD_RECOVERY_RUNNING, &recovery) ||
4691 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &recovery))) {
4692 if (test_bit(MD_RECOVERY_RESHAPE, &recovery))
4694 else if (test_bit(MD_RECOVERY_SYNC, &recovery)) {
4695 if (!test_bit(MD_RECOVERY_REQUESTED, &recovery))
4697 else if (test_bit(MD_RECOVERY_CHECK, &recovery))
4701 } else if (test_bit(MD_RECOVERY_RECOVER, &recovery))
4703 else if (mddev->reshape_position != MaxSector)
4706 return sprintf(page, "%s\n", type);
4710 action_store(struct mddev *mddev, const char *page, size_t len)
4712 if (!mddev->pers || !mddev->pers->sync_request)
4716 if (cmd_match(page, "idle") || cmd_match(page, "frozen")) {
4717 if (cmd_match(page, "frozen"))
4718 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4720 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4721 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
4722 mddev_lock(mddev) == 0) {
4723 flush_workqueue(md_misc_wq);
4724 if (mddev->sync_thread) {
4725 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4726 md_reap_sync_thread(mddev);
4728 mddev_unlock(mddev);
4730 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4732 else if (cmd_match(page, "resync"))
4733 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4734 else if (cmd_match(page, "recover")) {
4735 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4736 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
4737 } else if (cmd_match(page, "reshape")) {
4739 if (mddev->pers->start_reshape == NULL)
4741 err = mddev_lock(mddev);
4743 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4746 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4747 err = mddev->pers->start_reshape(mddev);
4749 mddev_unlock(mddev);
4753 sysfs_notify(&mddev->kobj, NULL, "degraded");
4755 if (cmd_match(page, "check"))
4756 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
4757 else if (!cmd_match(page, "repair"))
4759 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4760 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
4761 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
4763 if (mddev->ro == 2) {
4764 /* A write to sync_action is enough to justify
4765 * canceling read-auto mode
4768 md_wakeup_thread(mddev->sync_thread);
4770 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4771 md_wakeup_thread(mddev->thread);
4772 sysfs_notify_dirent_safe(mddev->sysfs_action);
4776 static struct md_sysfs_entry md_scan_mode =
4777 __ATTR_PREALLOC(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
4780 last_sync_action_show(struct mddev *mddev, char *page)
4782 return sprintf(page, "%s\n", mddev->last_sync_action);
4785 static struct md_sysfs_entry md_last_scan_mode = __ATTR_RO(last_sync_action);
4788 mismatch_cnt_show(struct mddev *mddev, char *page)
4790 return sprintf(page, "%llu\n",
4791 (unsigned long long)
4792 atomic64_read(&mddev->resync_mismatches));
4795 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
4798 sync_min_show(struct mddev *mddev, char *page)
4800 return sprintf(page, "%d (%s)\n", speed_min(mddev),
4801 mddev->sync_speed_min ? "local": "system");
4805 sync_min_store(struct mddev *mddev, const char *buf, size_t len)
4810 if (strncmp(buf, "system", 6)==0) {
4813 rv = kstrtouint(buf, 10, &min);
4819 mddev->sync_speed_min = min;
4823 static struct md_sysfs_entry md_sync_min =
4824 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
4827 sync_max_show(struct mddev *mddev, char *page)
4829 return sprintf(page, "%d (%s)\n", speed_max(mddev),
4830 mddev->sync_speed_max ? "local": "system");
4834 sync_max_store(struct mddev *mddev, const char *buf, size_t len)
4839 if (strncmp(buf, "system", 6)==0) {
4842 rv = kstrtouint(buf, 10, &max);
4848 mddev->sync_speed_max = max;
4852 static struct md_sysfs_entry md_sync_max =
4853 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
4856 degraded_show(struct mddev *mddev, char *page)
4858 return sprintf(page, "%d\n", mddev->degraded);
4860 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
4863 sync_force_parallel_show(struct mddev *mddev, char *page)
4865 return sprintf(page, "%d\n", mddev->parallel_resync);
4869 sync_force_parallel_store(struct mddev *mddev, const char *buf, size_t len)
4873 if (kstrtol(buf, 10, &n))
4876 if (n != 0 && n != 1)
4879 mddev->parallel_resync = n;
4881 if (mddev->sync_thread)
4882 wake_up(&resync_wait);
4887 /* force parallel resync, even with shared block devices */
4888 static struct md_sysfs_entry md_sync_force_parallel =
4889 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
4890 sync_force_parallel_show, sync_force_parallel_store);
4893 sync_speed_show(struct mddev *mddev, char *page)
4895 unsigned long resync, dt, db;
4896 if (mddev->curr_resync == 0)
4897 return sprintf(page, "none\n");
4898 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
4899 dt = (jiffies - mddev->resync_mark) / HZ;
4901 db = resync - mddev->resync_mark_cnt;
4902 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
4905 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
4908 sync_completed_show(struct mddev *mddev, char *page)
4910 unsigned long long max_sectors, resync;
4912 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4913 return sprintf(page, "none\n");
4915 if (mddev->curr_resync == 1 ||
4916 mddev->curr_resync == 2)
4917 return sprintf(page, "delayed\n");
4919 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
4920 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
4921 max_sectors = mddev->resync_max_sectors;
4923 max_sectors = mddev->dev_sectors;
4925 resync = mddev->curr_resync_completed;
4926 return sprintf(page, "%llu / %llu\n", resync, max_sectors);
4929 static struct md_sysfs_entry md_sync_completed =
4930 __ATTR_PREALLOC(sync_completed, S_IRUGO, sync_completed_show, NULL);
4933 min_sync_show(struct mddev *mddev, char *page)
4935 return sprintf(page, "%llu\n",
4936 (unsigned long long)mddev->resync_min);
4939 min_sync_store(struct mddev *mddev, const char *buf, size_t len)
4941 unsigned long long min;
4944 if (kstrtoull(buf, 10, &min))
4947 spin_lock(&mddev->lock);
4949 if (min > mddev->resync_max)
4953 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4956 /* Round down to multiple of 4K for safety */
4957 mddev->resync_min = round_down(min, 8);
4961 spin_unlock(&mddev->lock);
4965 static struct md_sysfs_entry md_min_sync =
4966 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
4969 max_sync_show(struct mddev *mddev, char *page)
4971 if (mddev->resync_max == MaxSector)
4972 return sprintf(page, "max\n");
4974 return sprintf(page, "%llu\n",
4975 (unsigned long long)mddev->resync_max);
4978 max_sync_store(struct mddev *mddev, const char *buf, size_t len)
4981 spin_lock(&mddev->lock);
4982 if (strncmp(buf, "max", 3) == 0)
4983 mddev->resync_max = MaxSector;
4985 unsigned long long max;
4989 if (kstrtoull(buf, 10, &max))
4991 if (max < mddev->resync_min)
4995 if (max < mddev->resync_max &&
4997 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
5000 /* Must be a multiple of chunk_size */
5001 chunk = mddev->chunk_sectors;
5003 sector_t temp = max;
5006 if (sector_div(temp, chunk))
5009 mddev->resync_max = max;
5011 wake_up(&mddev->recovery_wait);
5014 spin_unlock(&mddev->lock);
5018 static struct md_sysfs_entry md_max_sync =
5019 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
5022 suspend_lo_show(struct mddev *mddev, char *page)
5024 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
5028 suspend_lo_store(struct mddev *mddev, const char *buf, size_t len)
5030 unsigned long long new;
5033 err = kstrtoull(buf, 10, &new);
5036 if (new != (sector_t)new)
5039 err = mddev_lock(mddev);
5043 if (mddev->pers == NULL ||
5044 mddev->pers->quiesce == NULL)
5046 mddev_suspend(mddev);
5047 mddev->suspend_lo = new;
5048 mddev_resume(mddev);
5052 mddev_unlock(mddev);
5055 static struct md_sysfs_entry md_suspend_lo =
5056 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
5059 suspend_hi_show(struct mddev *mddev, char *page)
5061 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
5065 suspend_hi_store(struct mddev *mddev, const char *buf, size_t len)
5067 unsigned long long new;
5070 err = kstrtoull(buf, 10, &new);
5073 if (new != (sector_t)new)
5076 err = mddev_lock(mddev);
5080 if (mddev->pers == NULL)
5083 mddev_suspend(mddev);
5084 mddev->suspend_hi = new;
5085 mddev_resume(mddev);
5089 mddev_unlock(mddev);
5092 static struct md_sysfs_entry md_suspend_hi =
5093 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
5096 reshape_position_show(struct mddev *mddev, char *page)
5098 if (mddev->reshape_position != MaxSector)
5099 return sprintf(page, "%llu\n",
5100 (unsigned long long)mddev->reshape_position);
5101 strcpy(page, "none\n");
5106 reshape_position_store(struct mddev *mddev, const char *buf, size_t len)
5108 struct md_rdev *rdev;
5109 unsigned long long new;
5112 err = kstrtoull(buf, 10, &new);
5115 if (new != (sector_t)new)
5117 err = mddev_lock(mddev);
5123 mddev->reshape_position = new;
5124 mddev->delta_disks = 0;
5125 mddev->reshape_backwards = 0;
5126 mddev->new_level = mddev->level;
5127 mddev->new_layout = mddev->layout;
5128 mddev->new_chunk_sectors = mddev->chunk_sectors;
5129 rdev_for_each(rdev, mddev)
5130 rdev->new_data_offset = rdev->data_offset;
5133 mddev_unlock(mddev);
5137 static struct md_sysfs_entry md_reshape_position =
5138 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
5139 reshape_position_store);
5142 reshape_direction_show(struct mddev *mddev, char *page)
5144 return sprintf(page, "%s\n",
5145 mddev->reshape_backwards ? "backwards" : "forwards");
5149 reshape_direction_store(struct mddev *mddev, const char *buf, size_t len)
5154 if (cmd_match(buf, "forwards"))
5156 else if (cmd_match(buf, "backwards"))
5160 if (mddev->reshape_backwards == backwards)
5163 err = mddev_lock(mddev);
5166 /* check if we are allowed to change */
5167 if (mddev->delta_disks)
5169 else if (mddev->persistent &&
5170 mddev->major_version == 0)
5173 mddev->reshape_backwards = backwards;
5174 mddev_unlock(mddev);
5178 static struct md_sysfs_entry md_reshape_direction =
5179 __ATTR(reshape_direction, S_IRUGO|S_IWUSR, reshape_direction_show,
5180 reshape_direction_store);
5183 array_size_show(struct mddev *mddev, char *page)
5185 if (mddev->external_size)
5186 return sprintf(page, "%llu\n",
5187 (unsigned long long)mddev->array_sectors/2);
5189 return sprintf(page, "default\n");
5193 array_size_store(struct mddev *mddev, const char *buf, size_t len)
5198 err = mddev_lock(mddev);
5202 /* cluster raid doesn't support change array_sectors */
5203 if (mddev_is_clustered(mddev)) {
5204 mddev_unlock(mddev);
5208 if (strncmp(buf, "default", 7) == 0) {
5210 sectors = mddev->pers->size(mddev, 0, 0);
5212 sectors = mddev->array_sectors;
5214 mddev->external_size = 0;
5216 if (strict_blocks_to_sectors(buf, §ors) < 0)
5218 else if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors)
5221 mddev->external_size = 1;
5225 mddev->array_sectors = sectors;
5227 set_capacity(mddev->gendisk, mddev->array_sectors);
5228 revalidate_disk(mddev->gendisk);
5231 mddev_unlock(mddev);
5235 static struct md_sysfs_entry md_array_size =
5236 __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show,
5240 consistency_policy_show(struct mddev *mddev, char *page)
5244 if (test_bit(MD_HAS_JOURNAL, &mddev->flags)) {
5245 ret = sprintf(page, "journal\n");
5246 } else if (test_bit(MD_HAS_PPL, &mddev->flags)) {
5247 ret = sprintf(page, "ppl\n");
5248 } else if (mddev->bitmap) {
5249 ret = sprintf(page, "bitmap\n");
5250 } else if (mddev->pers) {
5251 if (mddev->pers->sync_request)
5252 ret = sprintf(page, "resync\n");
5254 ret = sprintf(page, "none\n");
5256 ret = sprintf(page, "unknown\n");
5263 consistency_policy_store(struct mddev *mddev, const char *buf, size_t len)
5268 if (mddev->pers->change_consistency_policy)
5269 err = mddev->pers->change_consistency_policy(mddev, buf);
5272 } else if (mddev->external && strncmp(buf, "ppl", 3) == 0) {
5273 set_bit(MD_HAS_PPL, &mddev->flags);
5278 return err ? err : len;
5281 static struct md_sysfs_entry md_consistency_policy =
5282 __ATTR(consistency_policy, S_IRUGO | S_IWUSR, consistency_policy_show,
5283 consistency_policy_store);
5285 static ssize_t fail_last_dev_show(struct mddev *mddev, char *page)
5287 return sprintf(page, "%d\n", mddev->fail_last_dev);
5291 * Setting fail_last_dev to true to allow last device to be forcibly removed
5292 * from RAID1/RAID10.
5295 fail_last_dev_store(struct mddev *mddev, const char *buf, size_t len)
5300 ret = kstrtobool(buf, &value);
5304 if (value != mddev->fail_last_dev)
5305 mddev->fail_last_dev = value;
5309 static struct md_sysfs_entry md_fail_last_dev =
5310 __ATTR(fail_last_dev, S_IRUGO | S_IWUSR, fail_last_dev_show,
5311 fail_last_dev_store);
5313 static struct attribute *md_default_attrs[] = {
5316 &md_raid_disks.attr,
5317 &md_chunk_size.attr,
5319 &md_resync_start.attr,
5321 &md_new_device.attr,
5322 &md_safe_delay.attr,
5323 &md_array_state.attr,
5324 &md_reshape_position.attr,
5325 &md_reshape_direction.attr,
5326 &md_array_size.attr,
5327 &max_corr_read_errors.attr,
5328 &md_consistency_policy.attr,
5329 &md_fail_last_dev.attr,
5333 static struct attribute *md_redundancy_attrs[] = {
5335 &md_last_scan_mode.attr,
5336 &md_mismatches.attr,
5339 &md_sync_speed.attr,
5340 &md_sync_force_parallel.attr,
5341 &md_sync_completed.attr,
5344 &md_suspend_lo.attr,
5345 &md_suspend_hi.attr,
5350 static struct attribute_group md_redundancy_group = {
5352 .attrs = md_redundancy_attrs,
5356 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
5358 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
5359 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
5364 spin_lock(&all_mddevs_lock);
5365 if (list_empty(&mddev->all_mddevs)) {
5366 spin_unlock(&all_mddevs_lock);
5370 spin_unlock(&all_mddevs_lock);
5372 rv = entry->show(mddev, page);
5378 md_attr_store(struct kobject *kobj, struct attribute *attr,
5379 const char *page, size_t length)
5381 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
5382 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
5387 if (!capable(CAP_SYS_ADMIN))
5389 spin_lock(&all_mddevs_lock);
5390 if (list_empty(&mddev->all_mddevs)) {
5391 spin_unlock(&all_mddevs_lock);
5395 spin_unlock(&all_mddevs_lock);
5396 rv = entry->store(mddev, page, length);
5401 static void md_free(struct kobject *ko)
5403 struct mddev *mddev = container_of(ko, struct mddev, kobj);
5405 if (mddev->sysfs_state)
5406 sysfs_put(mddev->sysfs_state);
5409 del_gendisk(mddev->gendisk);
5411 blk_cleanup_queue(mddev->queue);
5413 put_disk(mddev->gendisk);
5414 percpu_ref_exit(&mddev->writes_pending);
5416 bioset_exit(&mddev->bio_set);
5417 bioset_exit(&mddev->sync_set);
5421 static const struct sysfs_ops md_sysfs_ops = {
5422 .show = md_attr_show,
5423 .store = md_attr_store,
5425 static struct kobj_type md_ktype = {
5427 .sysfs_ops = &md_sysfs_ops,
5428 .default_attrs = md_default_attrs,
5433 static void mddev_delayed_delete(struct work_struct *ws)
5435 struct mddev *mddev = container_of(ws, struct mddev, del_work);
5437 sysfs_remove_group(&mddev->kobj, &md_bitmap_group);
5438 kobject_del(&mddev->kobj);
5439 kobject_put(&mddev->kobj);
5442 static void no_op(struct percpu_ref *r) {}
5444 int mddev_init_writes_pending(struct mddev *mddev)
5446 if (mddev->writes_pending.percpu_count_ptr)
5448 if (percpu_ref_init(&mddev->writes_pending, no_op,
5449 PERCPU_REF_ALLOW_REINIT, GFP_KERNEL) < 0)
5451 /* We want to start with the refcount at zero */
5452 percpu_ref_put(&mddev->writes_pending);
5455 EXPORT_SYMBOL_GPL(mddev_init_writes_pending);
5457 static int md_alloc(dev_t dev, char *name)
5460 * If dev is zero, name is the name of a device to allocate with
5461 * an arbitrary minor number. It will be "md_???"
5462 * If dev is non-zero it must be a device number with a MAJOR of
5463 * MD_MAJOR or mdp_major. In this case, if "name" is NULL, then
5464 * the device is being created by opening a node in /dev.
5465 * If "name" is not NULL, the device is being created by
5466 * writing to /sys/module/md_mod/parameters/new_array.
5468 static DEFINE_MUTEX(disks_mutex);
5469 struct mddev *mddev = mddev_find_or_alloc(dev);
5470 struct gendisk *disk;
5479 partitioned = (MAJOR(mddev->unit) != MD_MAJOR);
5480 shift = partitioned ? MdpMinorShift : 0;
5481 unit = MINOR(mddev->unit) >> shift;
5483 /* wait for any previous instance of this device to be
5484 * completely removed (mddev_delayed_delete).
5486 flush_workqueue(md_misc_wq);
5488 mutex_lock(&disks_mutex);
5494 /* Need to ensure that 'name' is not a duplicate.
5496 struct mddev *mddev2;
5497 spin_lock(&all_mddevs_lock);
5499 list_for_each_entry(mddev2, &all_mddevs, all_mddevs)
5500 if (mddev2->gendisk &&
5501 strcmp(mddev2->gendisk->disk_name, name) == 0) {
5502 spin_unlock(&all_mddevs_lock);
5505 spin_unlock(&all_mddevs_lock);
5509 * Creating /dev/mdNNN via "newarray", so adjust hold_active.
5511 mddev->hold_active = UNTIL_STOP;
5514 mddev->queue = blk_alloc_queue(GFP_KERNEL);
5517 mddev->queue->queuedata = mddev;
5519 blk_queue_make_request(mddev->queue, md_make_request);
5520 blk_set_stacking_limits(&mddev->queue->limits);
5522 disk = alloc_disk(1 << shift);
5524 blk_cleanup_queue(mddev->queue);
5525 mddev->queue = NULL;
5528 disk->major = MAJOR(mddev->unit);
5529 disk->first_minor = unit << shift;
5531 strcpy(disk->disk_name, name);
5532 else if (partitioned)
5533 sprintf(disk->disk_name, "md_d%d", unit);
5535 sprintf(disk->disk_name, "md%d", unit);
5536 disk->fops = &md_fops;
5537 disk->private_data = mddev;
5538 disk->queue = mddev->queue;
5539 blk_queue_write_cache(mddev->queue, true, true);
5540 /* Allow extended partitions. This makes the
5541 * 'mdp' device redundant, but we can't really
5544 disk->flags |= GENHD_FL_EXT_DEVT;
5545 mddev->gendisk = disk;
5548 error = kobject_add(&mddev->kobj, &disk_to_dev(disk)->kobj, "%s", "md");
5550 /* This isn't possible, but as kobject_init_and_add is marked
5551 * __must_check, we must do something with the result
5553 pr_debug("md: cannot register %s/md - name in use\n",
5557 if (mddev->kobj.sd &&
5558 sysfs_create_group(&mddev->kobj, &md_bitmap_group))
5559 pr_debug("pointless warning\n");
5561 mutex_unlock(&disks_mutex);
5562 if (!error && mddev->kobj.sd) {
5563 kobject_uevent(&mddev->kobj, KOBJ_ADD);
5564 mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state");
5570 static struct kobject *md_probe(dev_t dev, int *part, void *data)
5573 md_alloc(dev, NULL);
5577 static int add_named_array(const char *val, const struct kernel_param *kp)
5580 * val must be "md_*" or "mdNNN".
5581 * For "md_*" we allocate an array with a large free minor number, and
5582 * set the name to val. val must not already be an active name.
5583 * For "mdNNN" we allocate an array with the minor number NNN
5584 * which must not already be in use.
5586 int len = strlen(val);
5587 char buf[DISK_NAME_LEN];
5588 unsigned long devnum;
5590 while (len && val[len-1] == '\n')
5592 if (len >= DISK_NAME_LEN)
5594 strlcpy(buf, val, len+1);
5595 if (strncmp(buf, "md_", 3) == 0)
5596 return md_alloc(0, buf);
5597 if (strncmp(buf, "md", 2) == 0 &&
5599 kstrtoul(buf+2, 10, &devnum) == 0 &&
5600 devnum <= MINORMASK)
5601 return md_alloc(MKDEV(MD_MAJOR, devnum), NULL);
5606 static void md_safemode_timeout(struct timer_list *t)
5608 struct mddev *mddev = from_timer(mddev, t, safemode_timer);
5610 mddev->safemode = 1;
5611 if (mddev->external)
5612 sysfs_notify_dirent_safe(mddev->sysfs_state);
5614 md_wakeup_thread(mddev->thread);
5617 static int start_dirty_degraded;
5619 int md_run(struct mddev *mddev)
5622 struct md_rdev *rdev;
5623 struct md_personality *pers;
5625 if (list_empty(&mddev->disks))
5626 /* cannot run an array with no devices.. */
5631 /* Cannot run until previous stop completes properly */
5632 if (mddev->sysfs_active)
5636 * Analyze all RAID superblock(s)
5638 if (!mddev->raid_disks) {
5639 if (!mddev->persistent)
5641 err = analyze_sbs(mddev);
5646 if (mddev->level != LEVEL_NONE)
5647 request_module("md-level-%d", mddev->level);
5648 else if (mddev->clevel[0])
5649 request_module("md-%s", mddev->clevel);
5652 * Drop all container device buffers, from now on
5653 * the only valid external interface is through the md
5656 mddev->has_superblocks = false;
5657 rdev_for_each(rdev, mddev) {
5658 if (test_bit(Faulty, &rdev->flags))
5660 sync_blockdev(rdev->bdev);
5661 invalidate_bdev(rdev->bdev);
5662 if (mddev->ro != 1 &&
5663 (bdev_read_only(rdev->bdev) ||
5664 bdev_read_only(rdev->meta_bdev))) {
5667 set_disk_ro(mddev->gendisk, 1);
5671 mddev->has_superblocks = true;
5673 /* perform some consistency tests on the device.
5674 * We don't want the data to overlap the metadata,
5675 * Internal Bitmap issues have been handled elsewhere.
5677 if (rdev->meta_bdev) {
5678 /* Nothing to check */;
5679 } else if (rdev->data_offset < rdev->sb_start) {
5680 if (mddev->dev_sectors &&
5681 rdev->data_offset + mddev->dev_sectors
5683 pr_warn("md: %s: data overlaps metadata\n",
5688 if (rdev->sb_start + rdev->sb_size/512
5689 > rdev->data_offset) {
5690 pr_warn("md: %s: metadata overlaps data\n",
5695 sysfs_notify_dirent_safe(rdev->sysfs_state);
5698 if (!bioset_initialized(&mddev->bio_set)) {
5699 err = bioset_init(&mddev->bio_set, BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS);
5703 if (!bioset_initialized(&mddev->sync_set)) {
5704 err = bioset_init(&mddev->sync_set, BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS);
5709 spin_lock(&pers_lock);
5710 pers = find_pers(mddev->level, mddev->clevel);
5711 if (!pers || !try_module_get(pers->owner)) {
5712 spin_unlock(&pers_lock);
5713 if (mddev->level != LEVEL_NONE)
5714 pr_warn("md: personality for level %d is not loaded!\n",
5717 pr_warn("md: personality for level %s is not loaded!\n",
5722 spin_unlock(&pers_lock);
5723 if (mddev->level != pers->level) {
5724 mddev->level = pers->level;
5725 mddev->new_level = pers->level;
5727 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
5729 if (mddev->reshape_position != MaxSector &&
5730 pers->start_reshape == NULL) {
5731 /* This personality cannot handle reshaping... */
5732 module_put(pers->owner);
5737 if (pers->sync_request) {
5738 /* Warn if this is a potentially silly
5741 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
5742 struct md_rdev *rdev2;
5745 rdev_for_each(rdev, mddev)
5746 rdev_for_each(rdev2, mddev) {
5748 rdev->bdev->bd_contains ==
5749 rdev2->bdev->bd_contains) {
5750 pr_warn("%s: WARNING: %s appears to be on the same physical disk as %s.\n",
5752 bdevname(rdev->bdev,b),
5753 bdevname(rdev2->bdev,b2));
5759 pr_warn("True protection against single-disk failure might be compromised.\n");
5762 mddev->recovery = 0;
5763 /* may be over-ridden by personality */
5764 mddev->resync_max_sectors = mddev->dev_sectors;
5766 mddev->ok_start_degraded = start_dirty_degraded;
5768 if (start_readonly && mddev->ro == 0)
5769 mddev->ro = 2; /* read-only, but switch on first write */
5771 err = pers->run(mddev);
5773 pr_warn("md: pers->run() failed ...\n");
5774 else if (pers->size(mddev, 0, 0) < mddev->array_sectors) {
5775 WARN_ONCE(!mddev->external_size,
5776 "%s: default size too small, but 'external_size' not in effect?\n",
5778 pr_warn("md: invalid array_size %llu > default size %llu\n",
5779 (unsigned long long)mddev->array_sectors / 2,
5780 (unsigned long long)pers->size(mddev, 0, 0) / 2);
5783 if (err == 0 && pers->sync_request &&
5784 (mddev->bitmap_info.file || mddev->bitmap_info.offset)) {
5785 struct bitmap *bitmap;
5787 bitmap = md_bitmap_create(mddev, -1);
5788 if (IS_ERR(bitmap)) {
5789 err = PTR_ERR(bitmap);
5790 pr_warn("%s: failed to create bitmap (%d)\n",
5791 mdname(mddev), err);
5793 mddev->bitmap = bitmap;
5799 if (mddev->bitmap_info.max_write_behind > 0) {
5800 bool creat_pool = false;
5802 rdev_for_each(rdev, mddev) {
5803 if (test_bit(WriteMostly, &rdev->flags) &&
5807 if (creat_pool && mddev->wb_info_pool == NULL) {
5808 mddev->wb_info_pool =
5809 mempool_create_kmalloc_pool(NR_WB_INFOS,
5810 sizeof(struct wb_info));
5811 if (!mddev->wb_info_pool) {
5821 rdev_for_each(rdev, mddev) {
5822 if (rdev->raid_disk >= 0 &&
5823 !blk_queue_nonrot(bdev_get_queue(rdev->bdev))) {
5828 if (mddev->degraded)
5831 blk_queue_flag_set(QUEUE_FLAG_NONROT, mddev->queue);
5833 blk_queue_flag_clear(QUEUE_FLAG_NONROT, mddev->queue);
5834 mddev->queue->backing_dev_info->congested_data = mddev;
5835 mddev->queue->backing_dev_info->congested_fn = md_congested;
5837 if (pers->sync_request) {
5838 if (mddev->kobj.sd &&
5839 sysfs_create_group(&mddev->kobj, &md_redundancy_group))
5840 pr_warn("md: cannot register extra attributes for %s\n",
5842 mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action");
5843 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
5846 atomic_set(&mddev->max_corr_read_errors,
5847 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS);
5848 mddev->safemode = 0;
5849 if (mddev_is_clustered(mddev))
5850 mddev->safemode_delay = 0;
5852 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
5855 spin_lock(&mddev->lock);
5857 spin_unlock(&mddev->lock);
5858 rdev_for_each(rdev, mddev)
5859 if (rdev->raid_disk >= 0)
5860 sysfs_link_rdev(mddev, rdev); /* failure here is OK */
5862 if (mddev->degraded && !mddev->ro)
5863 /* This ensures that recovering status is reported immediately
5864 * via sysfs - until a lack of spares is confirmed.
5866 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
5867 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5869 if (mddev->sb_flags)
5870 md_update_sb(mddev, 0);
5872 md_new_event(mddev);
5876 mddev_detach(mddev);
5878 pers->free(mddev, mddev->private);
5879 mddev->private = NULL;
5880 module_put(pers->owner);
5881 md_bitmap_destroy(mddev);
5883 bioset_exit(&mddev->bio_set);
5884 bioset_exit(&mddev->sync_set);
5887 EXPORT_SYMBOL_GPL(md_run);
5889 static int do_md_run(struct mddev *mddev)
5893 set_bit(MD_NOT_READY, &mddev->flags);
5894 err = md_run(mddev);
5897 err = md_bitmap_load(mddev);
5899 md_bitmap_destroy(mddev);
5903 if (mddev_is_clustered(mddev))
5904 md_allow_write(mddev);
5906 /* run start up tasks that require md_thread */
5909 md_wakeup_thread(mddev->thread);
5910 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
5912 set_capacity(mddev->gendisk, mddev->array_sectors);
5913 revalidate_disk(mddev->gendisk);
5914 clear_bit(MD_NOT_READY, &mddev->flags);
5916 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
5917 sysfs_notify_dirent_safe(mddev->sysfs_state);
5918 sysfs_notify_dirent_safe(mddev->sysfs_action);
5919 sysfs_notify(&mddev->kobj, NULL, "degraded");
5921 clear_bit(MD_NOT_READY, &mddev->flags);
5925 int md_start(struct mddev *mddev)
5929 if (mddev->pers->start) {
5930 set_bit(MD_RECOVERY_WAIT, &mddev->recovery);
5931 md_wakeup_thread(mddev->thread);
5932 ret = mddev->pers->start(mddev);
5933 clear_bit(MD_RECOVERY_WAIT, &mddev->recovery);
5934 md_wakeup_thread(mddev->sync_thread);
5938 EXPORT_SYMBOL_GPL(md_start);
5940 static int restart_array(struct mddev *mddev)
5942 struct gendisk *disk = mddev->gendisk;
5943 struct md_rdev *rdev;
5944 bool has_journal = false;
5945 bool has_readonly = false;
5947 /* Complain if it has no devices */
5948 if (list_empty(&mddev->disks))
5956 rdev_for_each_rcu(rdev, mddev) {
5957 if (test_bit(Journal, &rdev->flags) &&
5958 !test_bit(Faulty, &rdev->flags))
5960 if (bdev_read_only(rdev->bdev))
5961 has_readonly = true;
5964 if (test_bit(MD_HAS_JOURNAL, &mddev->flags) && !has_journal)
5965 /* Don't restart rw with journal missing/faulty */
5970 mddev->safemode = 0;
5972 set_disk_ro(disk, 0);
5973 pr_debug("md: %s switched to read-write mode.\n", mdname(mddev));
5974 /* Kick recovery or resync if necessary */
5975 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5976 md_wakeup_thread(mddev->thread);
5977 md_wakeup_thread(mddev->sync_thread);
5978 sysfs_notify_dirent_safe(mddev->sysfs_state);
5982 static void md_clean(struct mddev *mddev)
5984 mddev->array_sectors = 0;
5985 mddev->external_size = 0;
5986 mddev->dev_sectors = 0;
5987 mddev->raid_disks = 0;
5988 mddev->recovery_cp = 0;
5989 mddev->resync_min = 0;
5990 mddev->resync_max = MaxSector;
5991 mddev->reshape_position = MaxSector;
5992 mddev->external = 0;
5993 mddev->persistent = 0;
5994 mddev->level = LEVEL_NONE;
5995 mddev->clevel[0] = 0;
5997 mddev->sb_flags = 0;
5999 mddev->metadata_type[0] = 0;
6000 mddev->chunk_sectors = 0;
6001 mddev->ctime = mddev->utime = 0;
6003 mddev->max_disks = 0;
6005 mddev->can_decrease_events = 0;
6006 mddev->delta_disks = 0;
6007 mddev->reshape_backwards = 0;
6008 mddev->new_level = LEVEL_NONE;
6009 mddev->new_layout = 0;
6010 mddev->new_chunk_sectors = 0;
6011 mddev->curr_resync = 0;
6012 atomic64_set(&mddev->resync_mismatches, 0);
6013 mddev->suspend_lo = mddev->suspend_hi = 0;
6014 mddev->sync_speed_min = mddev->sync_speed_max = 0;
6015 mddev->recovery = 0;
6018 mddev->degraded = 0;
6019 mddev->safemode = 0;
6020 mddev->private = NULL;
6021 mddev->cluster_info = NULL;
6022 mddev->bitmap_info.offset = 0;
6023 mddev->bitmap_info.default_offset = 0;
6024 mddev->bitmap_info.default_space = 0;
6025 mddev->bitmap_info.chunksize = 0;
6026 mddev->bitmap_info.daemon_sleep = 0;
6027 mddev->bitmap_info.max_write_behind = 0;
6028 mddev->bitmap_info.nodes = 0;
6031 static void __md_stop_writes(struct mddev *mddev)
6033 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6034 flush_workqueue(md_misc_wq);
6035 if (mddev->sync_thread) {
6036 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6037 md_reap_sync_thread(mddev);
6040 del_timer_sync(&mddev->safemode_timer);
6042 if (mddev->pers && mddev->pers->quiesce) {
6043 mddev->pers->quiesce(mddev, 1);
6044 mddev->pers->quiesce(mddev, 0);
6046 md_bitmap_flush(mddev);
6048 if (mddev->ro == 0 &&
6049 ((!mddev->in_sync && !mddev_is_clustered(mddev)) ||
6051 /* mark array as shutdown cleanly */
6052 if (!mddev_is_clustered(mddev))
6054 md_update_sb(mddev, 1);
6056 mempool_destroy(mddev->wb_info_pool);
6057 mddev->wb_info_pool = NULL;
6060 void md_stop_writes(struct mddev *mddev)
6062 mddev_lock_nointr(mddev);
6063 __md_stop_writes(mddev);
6064 mddev_unlock(mddev);
6066 EXPORT_SYMBOL_GPL(md_stop_writes);
6068 static void mddev_detach(struct mddev *mddev)
6070 md_bitmap_wait_behind_writes(mddev);
6071 if (mddev->pers && mddev->pers->quiesce && !mddev->suspended) {
6072 mddev->pers->quiesce(mddev, 1);
6073 mddev->pers->quiesce(mddev, 0);
6075 md_unregister_thread(&mddev->thread);
6077 blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/
6080 static void __md_stop(struct mddev *mddev)
6082 struct md_personality *pers = mddev->pers;
6083 md_bitmap_destroy(mddev);
6084 mddev_detach(mddev);
6085 /* Ensure ->event_work is done */
6086 flush_workqueue(md_misc_wq);
6087 spin_lock(&mddev->lock);
6089 spin_unlock(&mddev->lock);
6090 pers->free(mddev, mddev->private);
6091 mddev->private = NULL;
6092 if (pers->sync_request && mddev->to_remove == NULL)
6093 mddev->to_remove = &md_redundancy_group;
6094 module_put(pers->owner);
6095 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6098 void md_stop(struct mddev *mddev)
6100 /* stop the array and free an attached data structures.
6101 * This is called from dm-raid
6103 __md_stop_writes(mddev);
6105 bioset_exit(&mddev->bio_set);
6106 bioset_exit(&mddev->sync_set);
6109 EXPORT_SYMBOL_GPL(md_stop);
6111 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev)
6116 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
6118 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6119 md_wakeup_thread(mddev->thread);
6121 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
6122 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6123 if (mddev->sync_thread)
6124 /* Thread might be blocked waiting for metadata update
6125 * which will now never happen */
6126 wake_up_process(mddev->sync_thread->tsk);
6128 if (mddev->external && test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags))
6130 mddev_unlock(mddev);
6131 wait_event(resync_wait, !test_bit(MD_RECOVERY_RUNNING,
6133 wait_event(mddev->sb_wait,
6134 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags));
6135 mddev_lock_nointr(mddev);
6137 mutex_lock(&mddev->open_mutex);
6138 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
6139 mddev->sync_thread ||
6140 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
6141 pr_warn("md: %s still in use.\n",mdname(mddev));
6143 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6144 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6145 md_wakeup_thread(mddev->thread);
6151 __md_stop_writes(mddev);
6157 set_disk_ro(mddev->gendisk, 1);
6158 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6159 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6160 md_wakeup_thread(mddev->thread);
6161 sysfs_notify_dirent_safe(mddev->sysfs_state);
6165 mutex_unlock(&mddev->open_mutex);
6170 * 0 - completely stop and dis-assemble array
6171 * 2 - stop but do not disassemble array
6173 static int do_md_stop(struct mddev *mddev, int mode,
6174 struct block_device *bdev)
6176 struct gendisk *disk = mddev->gendisk;
6177 struct md_rdev *rdev;
6180 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
6182 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6183 md_wakeup_thread(mddev->thread);
6185 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
6186 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6187 if (mddev->sync_thread)
6188 /* Thread might be blocked waiting for metadata update
6189 * which will now never happen */
6190 wake_up_process(mddev->sync_thread->tsk);
6192 mddev_unlock(mddev);
6193 wait_event(resync_wait, (mddev->sync_thread == NULL &&
6194 !test_bit(MD_RECOVERY_RUNNING,
6195 &mddev->recovery)));
6196 mddev_lock_nointr(mddev);
6198 mutex_lock(&mddev->open_mutex);
6199 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
6200 mddev->sysfs_active ||
6201 mddev->sync_thread ||
6202 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
6203 pr_warn("md: %s still in use.\n",mdname(mddev));
6204 mutex_unlock(&mddev->open_mutex);
6206 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6207 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6208 md_wakeup_thread(mddev->thread);
6214 set_disk_ro(disk, 0);
6216 __md_stop_writes(mddev);
6218 mddev->queue->backing_dev_info->congested_fn = NULL;
6220 /* tell userspace to handle 'inactive' */
6221 sysfs_notify_dirent_safe(mddev->sysfs_state);
6223 rdev_for_each(rdev, mddev)
6224 if (rdev->raid_disk >= 0)
6225 sysfs_unlink_rdev(mddev, rdev);
6227 set_capacity(disk, 0);
6228 mutex_unlock(&mddev->open_mutex);
6230 revalidate_disk(disk);
6235 mutex_unlock(&mddev->open_mutex);
6237 * Free resources if final stop
6240 pr_info("md: %s stopped.\n", mdname(mddev));
6242 if (mddev->bitmap_info.file) {
6243 struct file *f = mddev->bitmap_info.file;
6244 spin_lock(&mddev->lock);
6245 mddev->bitmap_info.file = NULL;
6246 spin_unlock(&mddev->lock);
6249 mddev->bitmap_info.offset = 0;
6251 export_array(mddev);
6254 if (mddev->hold_active == UNTIL_STOP)
6255 mddev->hold_active = 0;
6257 md_new_event(mddev);
6258 sysfs_notify_dirent_safe(mddev->sysfs_state);
6263 static void autorun_array(struct mddev *mddev)
6265 struct md_rdev *rdev;
6268 if (list_empty(&mddev->disks))
6271 pr_info("md: running: ");
6273 rdev_for_each(rdev, mddev) {
6274 char b[BDEVNAME_SIZE];
6275 pr_cont("<%s>", bdevname(rdev->bdev,b));
6279 err = do_md_run(mddev);
6281 pr_warn("md: do_md_run() returned %d\n", err);
6282 do_md_stop(mddev, 0, NULL);
6287 * lets try to run arrays based on all disks that have arrived
6288 * until now. (those are in pending_raid_disks)
6290 * the method: pick the first pending disk, collect all disks with
6291 * the same UUID, remove all from the pending list and put them into
6292 * the 'same_array' list. Then order this list based on superblock
6293 * update time (freshest comes first), kick out 'old' disks and
6294 * compare superblocks. If everything's fine then run it.
6296 * If "unit" is allocated, then bump its reference count
6298 static void autorun_devices(int part)
6300 struct md_rdev *rdev0, *rdev, *tmp;
6301 struct mddev *mddev;
6302 char b[BDEVNAME_SIZE];
6304 pr_info("md: autorun ...\n");
6305 while (!list_empty(&pending_raid_disks)) {
6308 LIST_HEAD(candidates);
6309 rdev0 = list_entry(pending_raid_disks.next,
6310 struct md_rdev, same_set);
6312 pr_debug("md: considering %s ...\n", bdevname(rdev0->bdev,b));
6313 INIT_LIST_HEAD(&candidates);
6314 rdev_for_each_list(rdev, tmp, &pending_raid_disks)
6315 if (super_90_load(rdev, rdev0, 0) >= 0) {
6316 pr_debug("md: adding %s ...\n",
6317 bdevname(rdev->bdev,b));
6318 list_move(&rdev->same_set, &candidates);
6321 * now we have a set of devices, with all of them having
6322 * mostly sane superblocks. It's time to allocate the
6326 dev = MKDEV(mdp_major,
6327 rdev0->preferred_minor << MdpMinorShift);
6328 unit = MINOR(dev) >> MdpMinorShift;
6330 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
6333 if (rdev0->preferred_minor != unit) {
6334 pr_warn("md: unit number in %s is bad: %d\n",
6335 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
6339 md_probe(dev, NULL, NULL);
6340 mddev = mddev_find(dev);
6344 if (mddev_lock(mddev))
6345 pr_warn("md: %s locked, cannot run\n", mdname(mddev));
6346 else if (mddev->raid_disks || mddev->major_version
6347 || !list_empty(&mddev->disks)) {
6348 pr_warn("md: %s already running, cannot run %s\n",
6349 mdname(mddev), bdevname(rdev0->bdev,b));
6350 mddev_unlock(mddev);
6352 pr_debug("md: created %s\n", mdname(mddev));
6353 mddev->persistent = 1;
6354 rdev_for_each_list(rdev, tmp, &candidates) {
6355 list_del_init(&rdev->same_set);
6356 if (bind_rdev_to_array(rdev, mddev))
6359 autorun_array(mddev);
6360 mddev_unlock(mddev);
6362 /* on success, candidates will be empty, on error
6365 rdev_for_each_list(rdev, tmp, &candidates) {
6366 list_del_init(&rdev->same_set);
6371 pr_info("md: ... autorun DONE.\n");
6373 #endif /* !MODULE */
6375 static int get_version(void __user *arg)
6379 ver.major = MD_MAJOR_VERSION;
6380 ver.minor = MD_MINOR_VERSION;
6381 ver.patchlevel = MD_PATCHLEVEL_VERSION;
6383 if (copy_to_user(arg, &ver, sizeof(ver)))
6389 static int get_array_info(struct mddev *mddev, void __user *arg)
6391 mdu_array_info_t info;
6392 int nr,working,insync,failed,spare;
6393 struct md_rdev *rdev;
6395 nr = working = insync = failed = spare = 0;
6397 rdev_for_each_rcu(rdev, mddev) {
6399 if (test_bit(Faulty, &rdev->flags))
6403 if (test_bit(In_sync, &rdev->flags))
6405 else if (test_bit(Journal, &rdev->flags))
6406 /* TODO: add journal count to md_u.h */
6414 info.major_version = mddev->major_version;
6415 info.minor_version = mddev->minor_version;
6416 info.patch_version = MD_PATCHLEVEL_VERSION;
6417 info.ctime = clamp_t(time64_t, mddev->ctime, 0, U32_MAX);
6418 info.level = mddev->level;
6419 info.size = mddev->dev_sectors / 2;
6420 if (info.size != mddev->dev_sectors / 2) /* overflow */
6423 info.raid_disks = mddev->raid_disks;
6424 info.md_minor = mddev->md_minor;
6425 info.not_persistent= !mddev->persistent;
6427 info.utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX);
6430 info.state = (1<<MD_SB_CLEAN);
6431 if (mddev->bitmap && mddev->bitmap_info.offset)
6432 info.state |= (1<<MD_SB_BITMAP_PRESENT);
6433 if (mddev_is_clustered(mddev))
6434 info.state |= (1<<MD_SB_CLUSTERED);
6435 info.active_disks = insync;
6436 info.working_disks = working;
6437 info.failed_disks = failed;
6438 info.spare_disks = spare;
6440 info.layout = mddev->layout;
6441 info.chunk_size = mddev->chunk_sectors << 9;
6443 if (copy_to_user(arg, &info, sizeof(info)))
6449 static int get_bitmap_file(struct mddev *mddev, void __user * arg)
6451 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
6455 file = kzalloc(sizeof(*file), GFP_NOIO);
6460 spin_lock(&mddev->lock);
6461 /* bitmap enabled */
6462 if (mddev->bitmap_info.file) {
6463 ptr = file_path(mddev->bitmap_info.file, file->pathname,
6464 sizeof(file->pathname));
6468 memmove(file->pathname, ptr,
6469 sizeof(file->pathname)-(ptr-file->pathname));
6471 spin_unlock(&mddev->lock);
6474 copy_to_user(arg, file, sizeof(*file)))
6481 static int get_disk_info(struct mddev *mddev, void __user * arg)
6483 mdu_disk_info_t info;
6484 struct md_rdev *rdev;
6486 if (copy_from_user(&info, arg, sizeof(info)))
6490 rdev = md_find_rdev_nr_rcu(mddev, info.number);
6492 info.major = MAJOR(rdev->bdev->bd_dev);
6493 info.minor = MINOR(rdev->bdev->bd_dev);
6494 info.raid_disk = rdev->raid_disk;
6496 if (test_bit(Faulty, &rdev->flags))
6497 info.state |= (1<<MD_DISK_FAULTY);
6498 else if (test_bit(In_sync, &rdev->flags)) {
6499 info.state |= (1<<MD_DISK_ACTIVE);
6500 info.state |= (1<<MD_DISK_SYNC);
6502 if (test_bit(Journal, &rdev->flags))
6503 info.state |= (1<<MD_DISK_JOURNAL);
6504 if (test_bit(WriteMostly, &rdev->flags))
6505 info.state |= (1<<MD_DISK_WRITEMOSTLY);
6506 if (test_bit(FailFast, &rdev->flags))
6507 info.state |= (1<<MD_DISK_FAILFAST);
6509 info.major = info.minor = 0;
6510 info.raid_disk = -1;
6511 info.state = (1<<MD_DISK_REMOVED);
6515 if (copy_to_user(arg, &info, sizeof(info)))
6521 static int add_new_disk(struct mddev *mddev, mdu_disk_info_t *info)
6523 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
6524 struct md_rdev *rdev;
6525 dev_t dev = MKDEV(info->major,info->minor);
6527 if (mddev_is_clustered(mddev) &&
6528 !(info->state & ((1 << MD_DISK_CLUSTER_ADD) | (1 << MD_DISK_CANDIDATE)))) {
6529 pr_warn("%s: Cannot add to clustered mddev.\n",
6534 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
6537 if (!mddev->raid_disks) {
6539 /* expecting a device which has a superblock */
6540 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
6542 pr_warn("md: md_import_device returned %ld\n",
6544 return PTR_ERR(rdev);
6546 if (!list_empty(&mddev->disks)) {
6547 struct md_rdev *rdev0
6548 = list_entry(mddev->disks.next,
6549 struct md_rdev, same_set);
6550 err = super_types[mddev->major_version]
6551 .load_super(rdev, rdev0, mddev->minor_version);
6553 pr_warn("md: %s has different UUID to %s\n",
6554 bdevname(rdev->bdev,b),
6555 bdevname(rdev0->bdev,b2));
6560 err = bind_rdev_to_array(rdev, mddev);
6567 * add_new_disk can be used once the array is assembled
6568 * to add "hot spares". They must already have a superblock
6573 if (!mddev->pers->hot_add_disk) {
6574 pr_warn("%s: personality does not support diskops!\n",
6578 if (mddev->persistent)
6579 rdev = md_import_device(dev, mddev->major_version,
6580 mddev->minor_version);
6582 rdev = md_import_device(dev, -1, -1);
6584 pr_warn("md: md_import_device returned %ld\n",
6586 return PTR_ERR(rdev);
6588 /* set saved_raid_disk if appropriate */
6589 if (!mddev->persistent) {
6590 if (info->state & (1<<MD_DISK_SYNC) &&
6591 info->raid_disk < mddev->raid_disks) {
6592 rdev->raid_disk = info->raid_disk;
6593 set_bit(In_sync, &rdev->flags);
6594 clear_bit(Bitmap_sync, &rdev->flags);
6596 rdev->raid_disk = -1;
6597 rdev->saved_raid_disk = rdev->raid_disk;
6599 super_types[mddev->major_version].
6600 validate_super(mddev, rdev);
6601 if ((info->state & (1<<MD_DISK_SYNC)) &&
6602 rdev->raid_disk != info->raid_disk) {
6603 /* This was a hot-add request, but events doesn't
6604 * match, so reject it.
6610 clear_bit(In_sync, &rdev->flags); /* just to be sure */
6611 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
6612 set_bit(WriteMostly, &rdev->flags);
6614 clear_bit(WriteMostly, &rdev->flags);
6615 if (info->state & (1<<MD_DISK_FAILFAST))
6616 set_bit(FailFast, &rdev->flags);
6618 clear_bit(FailFast, &rdev->flags);
6620 if (info->state & (1<<MD_DISK_JOURNAL)) {
6621 struct md_rdev *rdev2;
6622 bool has_journal = false;
6624 /* make sure no existing journal disk */
6625 rdev_for_each(rdev2, mddev) {
6626 if (test_bit(Journal, &rdev2->flags)) {
6631 if (has_journal || mddev->bitmap) {
6635 set_bit(Journal, &rdev->flags);
6638 * check whether the device shows up in other nodes
6640 if (mddev_is_clustered(mddev)) {
6641 if (info->state & (1 << MD_DISK_CANDIDATE))
6642 set_bit(Candidate, &rdev->flags);
6643 else if (info->state & (1 << MD_DISK_CLUSTER_ADD)) {
6644 /* --add initiated by this node */
6645 err = md_cluster_ops->add_new_disk(mddev, rdev);
6653 rdev->raid_disk = -1;
6654 err = bind_rdev_to_array(rdev, mddev);
6659 if (mddev_is_clustered(mddev)) {
6660 if (info->state & (1 << MD_DISK_CANDIDATE)) {
6662 err = md_cluster_ops->new_disk_ack(mddev,
6665 md_kick_rdev_from_array(rdev);
6669 md_cluster_ops->add_new_disk_cancel(mddev);
6671 err = add_bound_rdev(rdev);
6675 err = add_bound_rdev(rdev);
6680 /* otherwise, add_new_disk is only allowed
6681 * for major_version==0 superblocks
6683 if (mddev->major_version != 0) {
6684 pr_warn("%s: ADD_NEW_DISK not supported\n", mdname(mddev));
6688 if (!(info->state & (1<<MD_DISK_FAULTY))) {
6690 rdev = md_import_device(dev, -1, 0);
6692 pr_warn("md: error, md_import_device() returned %ld\n",
6694 return PTR_ERR(rdev);
6696 rdev->desc_nr = info->number;
6697 if (info->raid_disk < mddev->raid_disks)
6698 rdev->raid_disk = info->raid_disk;
6700 rdev->raid_disk = -1;
6702 if (rdev->raid_disk < mddev->raid_disks)
6703 if (info->state & (1<<MD_DISK_SYNC))
6704 set_bit(In_sync, &rdev->flags);
6706 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
6707 set_bit(WriteMostly, &rdev->flags);
6708 if (info->state & (1<<MD_DISK_FAILFAST))
6709 set_bit(FailFast, &rdev->flags);
6711 if (!mddev->persistent) {
6712 pr_debug("md: nonpersistent superblock ...\n");
6713 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
6715 rdev->sb_start = calc_dev_sboffset(rdev);
6716 rdev->sectors = rdev->sb_start;
6718 err = bind_rdev_to_array(rdev, mddev);
6728 static int hot_remove_disk(struct mddev *mddev, dev_t dev)
6730 char b[BDEVNAME_SIZE];
6731 struct md_rdev *rdev;
6736 rdev = find_rdev(mddev, dev);
6740 if (rdev->raid_disk < 0)
6743 clear_bit(Blocked, &rdev->flags);
6744 remove_and_add_spares(mddev, rdev);
6746 if (rdev->raid_disk >= 0)
6750 if (mddev_is_clustered(mddev)) {
6751 if (md_cluster_ops->remove_disk(mddev, rdev))
6755 md_kick_rdev_from_array(rdev);
6756 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
6758 md_wakeup_thread(mddev->thread);
6760 md_update_sb(mddev, 1);
6761 md_new_event(mddev);
6765 pr_debug("md: cannot remove active disk %s from %s ...\n",
6766 bdevname(rdev->bdev,b), mdname(mddev));
6770 static int hot_add_disk(struct mddev *mddev, dev_t dev)
6772 char b[BDEVNAME_SIZE];
6774 struct md_rdev *rdev;
6779 if (mddev->major_version != 0) {
6780 pr_warn("%s: HOT_ADD may only be used with version-0 superblocks.\n",
6784 if (!mddev->pers->hot_add_disk) {
6785 pr_warn("%s: personality does not support diskops!\n",
6790 rdev = md_import_device(dev, -1, 0);
6792 pr_warn("md: error, md_import_device() returned %ld\n",
6797 if (mddev->persistent)
6798 rdev->sb_start = calc_dev_sboffset(rdev);
6800 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
6802 rdev->sectors = rdev->sb_start;
6804 if (test_bit(Faulty, &rdev->flags)) {
6805 pr_warn("md: can not hot-add faulty %s disk to %s!\n",
6806 bdevname(rdev->bdev,b), mdname(mddev));
6811 clear_bit(In_sync, &rdev->flags);
6813 rdev->saved_raid_disk = -1;
6814 err = bind_rdev_to_array(rdev, mddev);
6819 * The rest should better be atomic, we can have disk failures
6820 * noticed in interrupt contexts ...
6823 rdev->raid_disk = -1;
6825 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
6827 md_update_sb(mddev, 1);
6829 * Kick recovery, maybe this spare has to be added to the
6830 * array immediately.
6832 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6833 md_wakeup_thread(mddev->thread);
6834 md_new_event(mddev);
6842 static int set_bitmap_file(struct mddev *mddev, int fd)
6847 if (!mddev->pers->quiesce || !mddev->thread)
6849 if (mddev->recovery || mddev->sync_thread)
6851 /* we should be able to change the bitmap.. */
6855 struct inode *inode;
6858 if (mddev->bitmap || mddev->bitmap_info.file)
6859 return -EEXIST; /* cannot add when bitmap is present */
6863 pr_warn("%s: error: failed to get bitmap file\n",
6868 inode = f->f_mapping->host;
6869 if (!S_ISREG(inode->i_mode)) {
6870 pr_warn("%s: error: bitmap file must be a regular file\n",
6873 } else if (!(f->f_mode & FMODE_WRITE)) {
6874 pr_warn("%s: error: bitmap file must open for write\n",
6877 } else if (atomic_read(&inode->i_writecount) != 1) {
6878 pr_warn("%s: error: bitmap file is already in use\n",
6886 mddev->bitmap_info.file = f;
6887 mddev->bitmap_info.offset = 0; /* file overrides offset */
6888 } else if (mddev->bitmap == NULL)
6889 return -ENOENT; /* cannot remove what isn't there */
6893 struct bitmap *bitmap;
6895 bitmap = md_bitmap_create(mddev, -1);
6896 mddev_suspend(mddev);
6897 if (!IS_ERR(bitmap)) {
6898 mddev->bitmap = bitmap;
6899 err = md_bitmap_load(mddev);
6901 err = PTR_ERR(bitmap);
6903 md_bitmap_destroy(mddev);
6906 mddev_resume(mddev);
6907 } else if (fd < 0) {
6908 mddev_suspend(mddev);
6909 md_bitmap_destroy(mddev);
6910 mddev_resume(mddev);
6914 struct file *f = mddev->bitmap_info.file;
6916 spin_lock(&mddev->lock);
6917 mddev->bitmap_info.file = NULL;
6918 spin_unlock(&mddev->lock);
6927 * set_array_info is used two different ways
6928 * The original usage is when creating a new array.
6929 * In this usage, raid_disks is > 0 and it together with
6930 * level, size, not_persistent,layout,chunksize determine the
6931 * shape of the array.
6932 * This will always create an array with a type-0.90.0 superblock.
6933 * The newer usage is when assembling an array.
6934 * In this case raid_disks will be 0, and the major_version field is
6935 * use to determine which style super-blocks are to be found on the devices.
6936 * The minor and patch _version numbers are also kept incase the
6937 * super_block handler wishes to interpret them.
6939 static int set_array_info(struct mddev *mddev, mdu_array_info_t *info)
6942 if (info->raid_disks == 0) {
6943 /* just setting version number for superblock loading */
6944 if (info->major_version < 0 ||
6945 info->major_version >= ARRAY_SIZE(super_types) ||
6946 super_types[info->major_version].name == NULL) {
6947 /* maybe try to auto-load a module? */
6948 pr_warn("md: superblock version %d not known\n",
6949 info->major_version);
6952 mddev->major_version = info->major_version;
6953 mddev->minor_version = info->minor_version;
6954 mddev->patch_version = info->patch_version;
6955 mddev->persistent = !info->not_persistent;
6956 /* ensure mddev_put doesn't delete this now that there
6957 * is some minimal configuration.
6959 mddev->ctime = ktime_get_real_seconds();
6962 mddev->major_version = MD_MAJOR_VERSION;
6963 mddev->minor_version = MD_MINOR_VERSION;
6964 mddev->patch_version = MD_PATCHLEVEL_VERSION;
6965 mddev->ctime = ktime_get_real_seconds();
6967 mddev->level = info->level;
6968 mddev->clevel[0] = 0;
6969 mddev->dev_sectors = 2 * (sector_t)info->size;
6970 mddev->raid_disks = info->raid_disks;
6971 /* don't set md_minor, it is determined by which /dev/md* was
6974 if (info->state & (1<<MD_SB_CLEAN))
6975 mddev->recovery_cp = MaxSector;
6977 mddev->recovery_cp = 0;
6978 mddev->persistent = ! info->not_persistent;
6979 mddev->external = 0;
6981 mddev->layout = info->layout;
6982 if (mddev->level == 0)
6983 /* Cannot trust RAID0 layout info here */
6985 mddev->chunk_sectors = info->chunk_size >> 9;
6987 if (mddev->persistent) {
6988 mddev->max_disks = MD_SB_DISKS;
6990 mddev->sb_flags = 0;
6992 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
6994 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
6995 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
6996 mddev->bitmap_info.offset = 0;
6998 mddev->reshape_position = MaxSector;
7001 * Generate a 128 bit UUID
7003 get_random_bytes(mddev->uuid, 16);
7005 mddev->new_level = mddev->level;
7006 mddev->new_chunk_sectors = mddev->chunk_sectors;
7007 mddev->new_layout = mddev->layout;
7008 mddev->delta_disks = 0;
7009 mddev->reshape_backwards = 0;
7014 void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors)
7016 lockdep_assert_held(&mddev->reconfig_mutex);
7018 if (mddev->external_size)
7021 mddev->array_sectors = array_sectors;
7023 EXPORT_SYMBOL(md_set_array_sectors);
7025 static int update_size(struct mddev *mddev, sector_t num_sectors)
7027 struct md_rdev *rdev;
7029 int fit = (num_sectors == 0);
7030 sector_t old_dev_sectors = mddev->dev_sectors;
7032 if (mddev->pers->resize == NULL)
7034 /* The "num_sectors" is the number of sectors of each device that
7035 * is used. This can only make sense for arrays with redundancy.
7036 * linear and raid0 always use whatever space is available. We can only
7037 * consider changing this number if no resync or reconstruction is
7038 * happening, and if the new size is acceptable. It must fit before the
7039 * sb_start or, if that is <data_offset, it must fit before the size
7040 * of each device. If num_sectors is zero, we find the largest size
7043 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
7049 rdev_for_each(rdev, mddev) {
7050 sector_t avail = rdev->sectors;
7052 if (fit && (num_sectors == 0 || num_sectors > avail))
7053 num_sectors = avail;
7054 if (avail < num_sectors)
7057 rv = mddev->pers->resize(mddev, num_sectors);
7059 if (mddev_is_clustered(mddev))
7060 md_cluster_ops->update_size(mddev, old_dev_sectors);
7061 else if (mddev->queue) {
7062 set_capacity(mddev->gendisk, mddev->array_sectors);
7063 revalidate_disk(mddev->gendisk);
7069 static int update_raid_disks(struct mddev *mddev, int raid_disks)
7072 struct md_rdev *rdev;
7073 /* change the number of raid disks */
7074 if (mddev->pers->check_reshape == NULL)
7078 if (raid_disks <= 0 ||
7079 (mddev->max_disks && raid_disks >= mddev->max_disks))
7081 if (mddev->sync_thread ||
7082 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
7083 test_bit(MD_RESYNCING_REMOTE, &mddev->recovery) ||
7084 mddev->reshape_position != MaxSector)
7087 rdev_for_each(rdev, mddev) {
7088 if (mddev->raid_disks < raid_disks &&
7089 rdev->data_offset < rdev->new_data_offset)
7091 if (mddev->raid_disks > raid_disks &&
7092 rdev->data_offset > rdev->new_data_offset)
7096 mddev->delta_disks = raid_disks - mddev->raid_disks;
7097 if (mddev->delta_disks < 0)
7098 mddev->reshape_backwards = 1;
7099 else if (mddev->delta_disks > 0)
7100 mddev->reshape_backwards = 0;
7102 rv = mddev->pers->check_reshape(mddev);
7104 mddev->delta_disks = 0;
7105 mddev->reshape_backwards = 0;
7111 * update_array_info is used to change the configuration of an
7113 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
7114 * fields in the info are checked against the array.
7115 * Any differences that cannot be handled will cause an error.
7116 * Normally, only one change can be managed at a time.
7118 static int update_array_info(struct mddev *mddev, mdu_array_info_t *info)
7124 /* calculate expected state,ignoring low bits */
7125 if (mddev->bitmap && mddev->bitmap_info.offset)
7126 state |= (1 << MD_SB_BITMAP_PRESENT);
7128 if (mddev->major_version != info->major_version ||
7129 mddev->minor_version != info->minor_version ||
7130 /* mddev->patch_version != info->patch_version || */
7131 mddev->ctime != info->ctime ||
7132 mddev->level != info->level ||
7133 /* mddev->layout != info->layout || */
7134 mddev->persistent != !info->not_persistent ||
7135 mddev->chunk_sectors != info->chunk_size >> 9 ||
7136 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
7137 ((state^info->state) & 0xfffffe00)
7140 /* Check there is only one change */
7141 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
7143 if (mddev->raid_disks != info->raid_disks)
7145 if (mddev->layout != info->layout)
7147 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT))
7154 if (mddev->layout != info->layout) {
7156 * we don't need to do anything at the md level, the
7157 * personality will take care of it all.
7159 if (mddev->pers->check_reshape == NULL)
7162 mddev->new_layout = info->layout;
7163 rv = mddev->pers->check_reshape(mddev);
7165 mddev->new_layout = mddev->layout;
7169 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
7170 rv = update_size(mddev, (sector_t)info->size * 2);
7172 if (mddev->raid_disks != info->raid_disks)
7173 rv = update_raid_disks(mddev, info->raid_disks);
7175 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
7176 if (mddev->pers->quiesce == NULL || mddev->thread == NULL) {
7180 if (mddev->recovery || mddev->sync_thread) {
7184 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
7185 struct bitmap *bitmap;
7186 /* add the bitmap */
7187 if (mddev->bitmap) {
7191 if (mddev->bitmap_info.default_offset == 0) {
7195 mddev->bitmap_info.offset =
7196 mddev->bitmap_info.default_offset;
7197 mddev->bitmap_info.space =
7198 mddev->bitmap_info.default_space;
7199 bitmap = md_bitmap_create(mddev, -1);
7200 mddev_suspend(mddev);
7201 if (!IS_ERR(bitmap)) {
7202 mddev->bitmap = bitmap;
7203 rv = md_bitmap_load(mddev);
7205 rv = PTR_ERR(bitmap);
7207 md_bitmap_destroy(mddev);
7208 mddev_resume(mddev);
7210 /* remove the bitmap */
7211 if (!mddev->bitmap) {
7215 if (mddev->bitmap->storage.file) {
7219 if (mddev->bitmap_info.nodes) {
7220 /* hold PW on all the bitmap lock */
7221 if (md_cluster_ops->lock_all_bitmaps(mddev) <= 0) {
7222 pr_warn("md: can't change bitmap to none since the array is in use by more than one node\n");
7224 md_cluster_ops->unlock_all_bitmaps(mddev);
7228 mddev->bitmap_info.nodes = 0;
7229 md_cluster_ops->leave(mddev);
7231 mddev_suspend(mddev);
7232 md_bitmap_destroy(mddev);
7233 mddev_resume(mddev);
7234 mddev->bitmap_info.offset = 0;
7237 md_update_sb(mddev, 1);
7243 static int set_disk_faulty(struct mddev *mddev, dev_t dev)
7245 struct md_rdev *rdev;
7248 if (mddev->pers == NULL)
7252 rdev = md_find_rdev_rcu(mddev, dev);
7256 md_error(mddev, rdev);
7257 if (!test_bit(Faulty, &rdev->flags))
7265 * We have a problem here : there is no easy way to give a CHS
7266 * virtual geometry. We currently pretend that we have a 2 heads
7267 * 4 sectors (with a BIG number of cylinders...). This drives
7268 * dosfs just mad... ;-)
7270 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
7272 struct mddev *mddev = bdev->bd_disk->private_data;
7276 geo->cylinders = mddev->array_sectors / 8;
7280 static inline bool md_ioctl_valid(unsigned int cmd)
7285 case GET_ARRAY_INFO:
7286 case GET_BITMAP_FILE:
7289 case HOT_REMOVE_DISK:
7292 case RESTART_ARRAY_RW:
7294 case SET_ARRAY_INFO:
7295 case SET_BITMAP_FILE:
7296 case SET_DISK_FAULTY:
7299 case CLUSTERED_DISK_NACK:
7306 static int md_ioctl(struct block_device *bdev, fmode_t mode,
7307 unsigned int cmd, unsigned long arg)
7310 void __user *argp = (void __user *)arg;
7311 struct mddev *mddev = NULL;
7313 bool did_set_md_closing = false;
7315 if (!md_ioctl_valid(cmd))
7320 case GET_ARRAY_INFO:
7324 if (!capable(CAP_SYS_ADMIN))
7329 * Commands dealing with the RAID driver but not any
7334 err = get_version(argp);
7340 autostart_arrays(arg);
7347 * Commands creating/starting a new array:
7350 mddev = bdev->bd_disk->private_data;
7357 /* Some actions do not requires the mutex */
7359 case GET_ARRAY_INFO:
7360 if (!mddev->raid_disks && !mddev->external)
7363 err = get_array_info(mddev, argp);
7367 if (!mddev->raid_disks && !mddev->external)
7370 err = get_disk_info(mddev, argp);
7373 case SET_DISK_FAULTY:
7374 err = set_disk_faulty(mddev, new_decode_dev(arg));
7377 case GET_BITMAP_FILE:
7378 err = get_bitmap_file(mddev, argp);
7383 if (cmd == ADD_NEW_DISK)
7384 /* need to ensure md_delayed_delete() has completed */
7385 flush_workqueue(md_misc_wq);
7387 if (cmd == HOT_REMOVE_DISK)
7388 /* need to ensure recovery thread has run */
7389 wait_event_interruptible_timeout(mddev->sb_wait,
7390 !test_bit(MD_RECOVERY_NEEDED,
7392 msecs_to_jiffies(5000));
7393 if (cmd == STOP_ARRAY || cmd == STOP_ARRAY_RO) {
7394 /* Need to flush page cache, and ensure no-one else opens
7397 mutex_lock(&mddev->open_mutex);
7398 if (mddev->pers && atomic_read(&mddev->openers) > 1) {
7399 mutex_unlock(&mddev->open_mutex);
7403 if (test_and_set_bit(MD_CLOSING, &mddev->flags)) {
7404 mutex_unlock(&mddev->open_mutex);
7408 did_set_md_closing = true;
7409 mutex_unlock(&mddev->open_mutex);
7410 sync_blockdev(bdev);
7412 err = mddev_lock(mddev);
7414 pr_debug("md: ioctl lock interrupted, reason %d, cmd %d\n",
7419 if (cmd == SET_ARRAY_INFO) {
7420 mdu_array_info_t info;
7422 memset(&info, 0, sizeof(info));
7423 else if (copy_from_user(&info, argp, sizeof(info))) {
7428 err = update_array_info(mddev, &info);
7430 pr_warn("md: couldn't update array info. %d\n", err);
7435 if (!list_empty(&mddev->disks)) {
7436 pr_warn("md: array %s already has disks!\n", mdname(mddev));
7440 if (mddev->raid_disks) {
7441 pr_warn("md: array %s already initialised!\n", mdname(mddev));
7445 err = set_array_info(mddev, &info);
7447 pr_warn("md: couldn't set array info. %d\n", err);
7454 * Commands querying/configuring an existing array:
7456 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
7457 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
7458 if ((!mddev->raid_disks && !mddev->external)
7459 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
7460 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
7461 && cmd != GET_BITMAP_FILE) {
7467 * Commands even a read-only array can execute:
7470 case RESTART_ARRAY_RW:
7471 err = restart_array(mddev);
7475 err = do_md_stop(mddev, 0, bdev);
7479 err = md_set_readonly(mddev, bdev);
7482 case HOT_REMOVE_DISK:
7483 err = hot_remove_disk(mddev, new_decode_dev(arg));
7487 /* We can support ADD_NEW_DISK on read-only arrays
7488 * only if we are re-adding a preexisting device.
7489 * So require mddev->pers and MD_DISK_SYNC.
7492 mdu_disk_info_t info;
7493 if (copy_from_user(&info, argp, sizeof(info)))
7495 else if (!(info.state & (1<<MD_DISK_SYNC)))
7496 /* Need to clear read-only for this */
7499 err = add_new_disk(mddev, &info);
7505 if (get_user(ro, (int __user *)(arg))) {
7511 /* if the bdev is going readonly the value of mddev->ro
7512 * does not matter, no writes are coming
7517 /* are we are already prepared for writes? */
7521 /* transitioning to readauto need only happen for
7522 * arrays that call md_write_start
7525 err = restart_array(mddev);
7528 set_disk_ro(mddev->gendisk, 0);
7535 * The remaining ioctls are changing the state of the
7536 * superblock, so we do not allow them on read-only arrays.
7538 if (mddev->ro && mddev->pers) {
7539 if (mddev->ro == 2) {
7541 sysfs_notify_dirent_safe(mddev->sysfs_state);
7542 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7543 /* mddev_unlock will wake thread */
7544 /* If a device failed while we were read-only, we
7545 * need to make sure the metadata is updated now.
7547 if (test_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags)) {
7548 mddev_unlock(mddev);
7549 wait_event(mddev->sb_wait,
7550 !test_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags) &&
7551 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags));
7552 mddev_lock_nointr(mddev);
7563 mdu_disk_info_t info;
7564 if (copy_from_user(&info, argp, sizeof(info)))
7567 err = add_new_disk(mddev, &info);
7571 case CLUSTERED_DISK_NACK:
7572 if (mddev_is_clustered(mddev))
7573 md_cluster_ops->new_disk_ack(mddev, false);
7579 err = hot_add_disk(mddev, new_decode_dev(arg));
7583 err = do_md_run(mddev);
7586 case SET_BITMAP_FILE:
7587 err = set_bitmap_file(mddev, (int)arg);
7596 if (mddev->hold_active == UNTIL_IOCTL &&
7598 mddev->hold_active = 0;
7599 mddev_unlock(mddev);
7601 if(did_set_md_closing)
7602 clear_bit(MD_CLOSING, &mddev->flags);
7605 #ifdef CONFIG_COMPAT
7606 static int md_compat_ioctl(struct block_device *bdev, fmode_t mode,
7607 unsigned int cmd, unsigned long arg)
7610 case HOT_REMOVE_DISK:
7612 case SET_DISK_FAULTY:
7613 case SET_BITMAP_FILE:
7614 /* These take in integer arg, do not convert */
7617 arg = (unsigned long)compat_ptr(arg);
7621 return md_ioctl(bdev, mode, cmd, arg);
7623 #endif /* CONFIG_COMPAT */
7625 static int md_open(struct block_device *bdev, fmode_t mode)
7628 * Succeed if we can lock the mddev, which confirms that
7629 * it isn't being stopped right now.
7631 struct mddev *mddev = mddev_find(bdev->bd_dev);
7637 if (mddev->gendisk != bdev->bd_disk) {
7638 /* we are racing with mddev_put which is discarding this
7642 /* Wait until bdev->bd_disk is definitely gone */
7643 if (work_pending(&mddev->del_work))
7644 flush_workqueue(md_misc_wq);
7647 BUG_ON(mddev != bdev->bd_disk->private_data);
7649 if ((err = mutex_lock_interruptible(&mddev->open_mutex)))
7652 if (test_bit(MD_CLOSING, &mddev->flags)) {
7653 mutex_unlock(&mddev->open_mutex);
7659 atomic_inc(&mddev->openers);
7660 mutex_unlock(&mddev->open_mutex);
7662 check_disk_change(bdev);
7669 static void md_release(struct gendisk *disk, fmode_t mode)
7671 struct mddev *mddev = disk->private_data;
7674 atomic_dec(&mddev->openers);
7678 static int md_media_changed(struct gendisk *disk)
7680 struct mddev *mddev = disk->private_data;
7682 return mddev->changed;
7685 static int md_revalidate(struct gendisk *disk)
7687 struct mddev *mddev = disk->private_data;
7692 static const struct block_device_operations md_fops =
7694 .owner = THIS_MODULE,
7696 .release = md_release,
7698 #ifdef CONFIG_COMPAT
7699 .compat_ioctl = md_compat_ioctl,
7701 .getgeo = md_getgeo,
7702 .media_changed = md_media_changed,
7703 .revalidate_disk= md_revalidate,
7706 static int md_thread(void *arg)
7708 struct md_thread *thread = arg;
7711 * md_thread is a 'system-thread', it's priority should be very
7712 * high. We avoid resource deadlocks individually in each
7713 * raid personality. (RAID5 does preallocation) We also use RR and
7714 * the very same RT priority as kswapd, thus we will never get
7715 * into a priority inversion deadlock.
7717 * we definitely have to have equal or higher priority than
7718 * bdflush, otherwise bdflush will deadlock if there are too
7719 * many dirty RAID5 blocks.
7722 allow_signal(SIGKILL);
7723 while (!kthread_should_stop()) {
7725 /* We need to wait INTERRUPTIBLE so that
7726 * we don't add to the load-average.
7727 * That means we need to be sure no signals are
7730 if (signal_pending(current))
7731 flush_signals(current);
7733 wait_event_interruptible_timeout
7735 test_bit(THREAD_WAKEUP, &thread->flags)
7736 || kthread_should_stop() || kthread_should_park(),
7739 clear_bit(THREAD_WAKEUP, &thread->flags);
7740 if (kthread_should_park())
7742 if (!kthread_should_stop())
7743 thread->run(thread);
7749 void md_wakeup_thread(struct md_thread *thread)
7752 pr_debug("md: waking up MD thread %s.\n", thread->tsk->comm);
7753 set_bit(THREAD_WAKEUP, &thread->flags);
7754 wake_up(&thread->wqueue);
7757 EXPORT_SYMBOL(md_wakeup_thread);
7759 struct md_thread *md_register_thread(void (*run) (struct md_thread *),
7760 struct mddev *mddev, const char *name)
7762 struct md_thread *thread;
7764 thread = kzalloc(sizeof(struct md_thread), GFP_KERNEL);
7768 init_waitqueue_head(&thread->wqueue);
7771 thread->mddev = mddev;
7772 thread->timeout = MAX_SCHEDULE_TIMEOUT;
7773 thread->tsk = kthread_run(md_thread, thread,
7775 mdname(thread->mddev),
7777 if (IS_ERR(thread->tsk)) {
7783 EXPORT_SYMBOL(md_register_thread);
7785 void md_unregister_thread(struct md_thread **threadp)
7787 struct md_thread *thread;
7790 * Locking ensures that mddev_unlock does not wake_up a
7791 * non-existent thread
7793 spin_lock(&pers_lock);
7796 spin_unlock(&pers_lock);
7800 spin_unlock(&pers_lock);
7802 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
7803 kthread_stop(thread->tsk);
7806 EXPORT_SYMBOL(md_unregister_thread);
7808 void md_error(struct mddev *mddev, struct md_rdev *rdev)
7810 if (!rdev || test_bit(Faulty, &rdev->flags))
7813 if (!mddev->pers || !mddev->pers->error_handler)
7815 mddev->pers->error_handler(mddev,rdev);
7816 if (mddev->degraded)
7817 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7818 sysfs_notify_dirent_safe(rdev->sysfs_state);
7819 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7820 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7821 md_wakeup_thread(mddev->thread);
7822 if (mddev->event_work.func)
7823 queue_work(md_misc_wq, &mddev->event_work);
7824 md_new_event(mddev);
7826 EXPORT_SYMBOL(md_error);
7828 /* seq_file implementation /proc/mdstat */
7830 static void status_unused(struct seq_file *seq)
7833 struct md_rdev *rdev;
7835 seq_printf(seq, "unused devices: ");
7837 list_for_each_entry(rdev, &pending_raid_disks, same_set) {
7838 char b[BDEVNAME_SIZE];
7840 seq_printf(seq, "%s ",
7841 bdevname(rdev->bdev,b));
7844 seq_printf(seq, "<none>");
7846 seq_printf(seq, "\n");
7849 static int status_resync(struct seq_file *seq, struct mddev *mddev)
7851 sector_t max_sectors, resync, res;
7852 unsigned long dt, db = 0;
7853 sector_t rt, curr_mark_cnt, resync_mark_cnt;
7854 int scale, recovery_active;
7855 unsigned int per_milli;
7857 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
7858 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
7859 max_sectors = mddev->resync_max_sectors;
7861 max_sectors = mddev->dev_sectors;
7863 resync = mddev->curr_resync;
7865 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
7866 /* Still cleaning up */
7867 resync = max_sectors;
7868 } else if (resync > max_sectors)
7869 resync = max_sectors;
7871 resync -= atomic_read(&mddev->recovery_active);
7874 if (test_bit(MD_RESYNCING_REMOTE, &mddev->recovery)) {
7875 struct md_rdev *rdev;
7877 rdev_for_each(rdev, mddev)
7878 if (rdev->raid_disk >= 0 &&
7879 !test_bit(Faulty, &rdev->flags) &&
7880 rdev->recovery_offset != MaxSector &&
7881 rdev->recovery_offset) {
7882 seq_printf(seq, "\trecover=REMOTE");
7885 if (mddev->reshape_position != MaxSector)
7886 seq_printf(seq, "\treshape=REMOTE");
7888 seq_printf(seq, "\tresync=REMOTE");
7891 if (mddev->recovery_cp < MaxSector) {
7892 seq_printf(seq, "\tresync=PENDING");
7898 seq_printf(seq, "\tresync=DELAYED");
7902 WARN_ON(max_sectors == 0);
7903 /* Pick 'scale' such that (resync>>scale)*1000 will fit
7904 * in a sector_t, and (max_sectors>>scale) will fit in a
7905 * u32, as those are the requirements for sector_div.
7906 * Thus 'scale' must be at least 10
7909 if (sizeof(sector_t) > sizeof(unsigned long)) {
7910 while ( max_sectors/2 > (1ULL<<(scale+32)))
7913 res = (resync>>scale)*1000;
7914 sector_div(res, (u32)((max_sectors>>scale)+1));
7918 int i, x = per_milli/50, y = 20-x;
7919 seq_printf(seq, "[");
7920 for (i = 0; i < x; i++)
7921 seq_printf(seq, "=");
7922 seq_printf(seq, ">");
7923 for (i = 0; i < y; i++)
7924 seq_printf(seq, ".");
7925 seq_printf(seq, "] ");
7927 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
7928 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
7930 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
7932 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
7933 "resync" : "recovery"))),
7934 per_milli/10, per_milli % 10,
7935 (unsigned long long) resync/2,
7936 (unsigned long long) max_sectors/2);
7939 * dt: time from mark until now
7940 * db: blocks written from mark until now
7941 * rt: remaining time
7943 * rt is a sector_t, which is always 64bit now. We are keeping
7944 * the original algorithm, but it is not really necessary.
7946 * Original algorithm:
7947 * So we divide before multiply in case it is 32bit and close
7949 * We scale the divisor (db) by 32 to avoid losing precision
7950 * near the end of resync when the number of remaining sectors
7952 * We then divide rt by 32 after multiplying by db to compensate.
7953 * The '+1' avoids division by zero if db is very small.
7955 dt = ((jiffies - mddev->resync_mark) / HZ);
7958 curr_mark_cnt = mddev->curr_mark_cnt;
7959 recovery_active = atomic_read(&mddev->recovery_active);
7960 resync_mark_cnt = mddev->resync_mark_cnt;
7962 if (curr_mark_cnt >= (recovery_active + resync_mark_cnt))
7963 db = curr_mark_cnt - (recovery_active + resync_mark_cnt);
7965 rt = max_sectors - resync; /* number of remaining sectors */
7966 rt = div64_u64(rt, db/32+1);
7970 seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60,
7971 ((unsigned long)rt % 60)/6);
7973 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
7977 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
7979 struct list_head *tmp;
7981 struct mddev *mddev;
7993 spin_lock(&all_mddevs_lock);
7994 list_for_each(tmp,&all_mddevs)
7996 mddev = list_entry(tmp, struct mddev, all_mddevs);
7998 spin_unlock(&all_mddevs_lock);
8001 spin_unlock(&all_mddevs_lock);
8003 return (void*)2;/* tail */
8007 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
8009 struct list_head *tmp;
8010 struct mddev *next_mddev, *mddev = v;
8016 spin_lock(&all_mddevs_lock);
8018 tmp = all_mddevs.next;
8020 tmp = mddev->all_mddevs.next;
8021 if (tmp != &all_mddevs)
8022 next_mddev = mddev_get(list_entry(tmp,struct mddev,all_mddevs));
8024 next_mddev = (void*)2;
8027 spin_unlock(&all_mddevs_lock);
8035 static void md_seq_stop(struct seq_file *seq, void *v)
8037 struct mddev *mddev = v;
8039 if (mddev && v != (void*)1 && v != (void*)2)
8043 static int md_seq_show(struct seq_file *seq, void *v)
8045 struct mddev *mddev = v;
8047 struct md_rdev *rdev;
8049 if (v == (void*)1) {
8050 struct md_personality *pers;
8051 seq_printf(seq, "Personalities : ");
8052 spin_lock(&pers_lock);
8053 list_for_each_entry(pers, &pers_list, list)
8054 seq_printf(seq, "[%s] ", pers->name);
8056 spin_unlock(&pers_lock);
8057 seq_printf(seq, "\n");
8058 seq->poll_event = atomic_read(&md_event_count);
8061 if (v == (void*)2) {
8066 spin_lock(&mddev->lock);
8067 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
8068 seq_printf(seq, "%s : %sactive", mdname(mddev),
8069 mddev->pers ? "" : "in");
8072 seq_printf(seq, " (read-only)");
8074 seq_printf(seq, " (auto-read-only)");
8075 seq_printf(seq, " %s", mddev->pers->name);
8080 rdev_for_each_rcu(rdev, mddev) {
8081 char b[BDEVNAME_SIZE];
8082 seq_printf(seq, " %s[%d]",
8083 bdevname(rdev->bdev,b), rdev->desc_nr);
8084 if (test_bit(WriteMostly, &rdev->flags))
8085 seq_printf(seq, "(W)");
8086 if (test_bit(Journal, &rdev->flags))
8087 seq_printf(seq, "(J)");
8088 if (test_bit(Faulty, &rdev->flags)) {
8089 seq_printf(seq, "(F)");
8092 if (rdev->raid_disk < 0)
8093 seq_printf(seq, "(S)"); /* spare */
8094 if (test_bit(Replacement, &rdev->flags))
8095 seq_printf(seq, "(R)");
8096 sectors += rdev->sectors;
8100 if (!list_empty(&mddev->disks)) {
8102 seq_printf(seq, "\n %llu blocks",
8103 (unsigned long long)
8104 mddev->array_sectors / 2);
8106 seq_printf(seq, "\n %llu blocks",
8107 (unsigned long long)sectors / 2);
8109 if (mddev->persistent) {
8110 if (mddev->major_version != 0 ||
8111 mddev->minor_version != 90) {
8112 seq_printf(seq," super %d.%d",
8113 mddev->major_version,
8114 mddev->minor_version);
8116 } else if (mddev->external)
8117 seq_printf(seq, " super external:%s",
8118 mddev->metadata_type);
8120 seq_printf(seq, " super non-persistent");
8123 mddev->pers->status(seq, mddev);
8124 seq_printf(seq, "\n ");
8125 if (mddev->pers->sync_request) {
8126 if (status_resync(seq, mddev))
8127 seq_printf(seq, "\n ");
8130 seq_printf(seq, "\n ");
8132 md_bitmap_status(seq, mddev->bitmap);
8134 seq_printf(seq, "\n");
8136 spin_unlock(&mddev->lock);
8141 static const struct seq_operations md_seq_ops = {
8142 .start = md_seq_start,
8143 .next = md_seq_next,
8144 .stop = md_seq_stop,
8145 .show = md_seq_show,
8148 static int md_seq_open(struct inode *inode, struct file *file)
8150 struct seq_file *seq;
8153 error = seq_open(file, &md_seq_ops);
8157 seq = file->private_data;
8158 seq->poll_event = atomic_read(&md_event_count);
8162 static int md_unloading;
8163 static __poll_t mdstat_poll(struct file *filp, poll_table *wait)
8165 struct seq_file *seq = filp->private_data;
8169 return EPOLLIN|EPOLLRDNORM|EPOLLERR|EPOLLPRI;
8170 poll_wait(filp, &md_event_waiters, wait);
8172 /* always allow read */
8173 mask = EPOLLIN | EPOLLRDNORM;
8175 if (seq->poll_event != atomic_read(&md_event_count))
8176 mask |= EPOLLERR | EPOLLPRI;
8180 static const struct file_operations md_seq_fops = {
8181 .owner = THIS_MODULE,
8182 .open = md_seq_open,
8184 .llseek = seq_lseek,
8185 .release = seq_release,
8186 .poll = mdstat_poll,
8189 int register_md_personality(struct md_personality *p)
8191 pr_debug("md: %s personality registered for level %d\n",
8193 spin_lock(&pers_lock);
8194 list_add_tail(&p->list, &pers_list);
8195 spin_unlock(&pers_lock);
8198 EXPORT_SYMBOL(register_md_personality);
8200 int unregister_md_personality(struct md_personality *p)
8202 pr_debug("md: %s personality unregistered\n", p->name);
8203 spin_lock(&pers_lock);
8204 list_del_init(&p->list);
8205 spin_unlock(&pers_lock);
8208 EXPORT_SYMBOL(unregister_md_personality);
8210 int register_md_cluster_operations(struct md_cluster_operations *ops,
8211 struct module *module)
8214 spin_lock(&pers_lock);
8215 if (md_cluster_ops != NULL)
8218 md_cluster_ops = ops;
8219 md_cluster_mod = module;
8221 spin_unlock(&pers_lock);
8224 EXPORT_SYMBOL(register_md_cluster_operations);
8226 int unregister_md_cluster_operations(void)
8228 spin_lock(&pers_lock);
8229 md_cluster_ops = NULL;
8230 spin_unlock(&pers_lock);
8233 EXPORT_SYMBOL(unregister_md_cluster_operations);
8235 int md_setup_cluster(struct mddev *mddev, int nodes)
8237 if (!md_cluster_ops)
8238 request_module("md-cluster");
8239 spin_lock(&pers_lock);
8240 /* ensure module won't be unloaded */
8241 if (!md_cluster_ops || !try_module_get(md_cluster_mod)) {
8242 pr_warn("can't find md-cluster module or get it's reference.\n");
8243 spin_unlock(&pers_lock);
8246 spin_unlock(&pers_lock);
8248 return md_cluster_ops->join(mddev, nodes);
8251 void md_cluster_stop(struct mddev *mddev)
8253 if (!md_cluster_ops)
8255 md_cluster_ops->leave(mddev);
8256 module_put(md_cluster_mod);
8259 static int is_mddev_idle(struct mddev *mddev, int init)
8261 struct md_rdev *rdev;
8267 rdev_for_each_rcu(rdev, mddev) {
8268 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
8269 curr_events = (int)part_stat_read_accum(&disk->part0, sectors) -
8270 atomic_read(&disk->sync_io);
8271 /* sync IO will cause sync_io to increase before the disk_stats
8272 * as sync_io is counted when a request starts, and
8273 * disk_stats is counted when it completes.
8274 * So resync activity will cause curr_events to be smaller than
8275 * when there was no such activity.
8276 * non-sync IO will cause disk_stat to increase without
8277 * increasing sync_io so curr_events will (eventually)
8278 * be larger than it was before. Once it becomes
8279 * substantially larger, the test below will cause
8280 * the array to appear non-idle, and resync will slow
8282 * If there is a lot of outstanding resync activity when
8283 * we set last_event to curr_events, then all that activity
8284 * completing might cause the array to appear non-idle
8285 * and resync will be slowed down even though there might
8286 * not have been non-resync activity. This will only
8287 * happen once though. 'last_events' will soon reflect
8288 * the state where there is little or no outstanding
8289 * resync requests, and further resync activity will
8290 * always make curr_events less than last_events.
8293 if (init || curr_events - rdev->last_events > 64) {
8294 rdev->last_events = curr_events;
8302 void md_done_sync(struct mddev *mddev, int blocks, int ok)
8304 /* another "blocks" (512byte) blocks have been synced */
8305 atomic_sub(blocks, &mddev->recovery_active);
8306 wake_up(&mddev->recovery_wait);
8308 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8309 set_bit(MD_RECOVERY_ERROR, &mddev->recovery);
8310 md_wakeup_thread(mddev->thread);
8311 // stop recovery, signal do_sync ....
8314 EXPORT_SYMBOL(md_done_sync);
8316 /* md_write_start(mddev, bi)
8317 * If we need to update some array metadata (e.g. 'active' flag
8318 * in superblock) before writing, schedule a superblock update
8319 * and wait for it to complete.
8320 * A return value of 'false' means that the write wasn't recorded
8321 * and cannot proceed as the array is being suspend.
8323 bool md_write_start(struct mddev *mddev, struct bio *bi)
8327 if (bio_data_dir(bi) != WRITE)
8330 BUG_ON(mddev->ro == 1);
8331 if (mddev->ro == 2) {
8332 /* need to switch to read/write */
8334 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8335 md_wakeup_thread(mddev->thread);
8336 md_wakeup_thread(mddev->sync_thread);
8340 percpu_ref_get(&mddev->writes_pending);
8341 smp_mb(); /* Match smp_mb in set_in_sync() */
8342 if (mddev->safemode == 1)
8343 mddev->safemode = 0;
8344 /* sync_checkers is always 0 when writes_pending is in per-cpu mode */
8345 if (mddev->in_sync || mddev->sync_checkers) {
8346 spin_lock(&mddev->lock);
8347 if (mddev->in_sync) {
8349 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
8350 set_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
8351 md_wakeup_thread(mddev->thread);
8354 spin_unlock(&mddev->lock);
8358 sysfs_notify_dirent_safe(mddev->sysfs_state);
8359 if (!mddev->has_superblocks)
8361 wait_event(mddev->sb_wait,
8362 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags) ||
8364 if (test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) {
8365 percpu_ref_put(&mddev->writes_pending);
8370 EXPORT_SYMBOL(md_write_start);
8372 /* md_write_inc can only be called when md_write_start() has
8373 * already been called at least once of the current request.
8374 * It increments the counter and is useful when a single request
8375 * is split into several parts. Each part causes an increment and
8376 * so needs a matching md_write_end().
8377 * Unlike md_write_start(), it is safe to call md_write_inc() inside
8378 * a spinlocked region.
8380 void md_write_inc(struct mddev *mddev, struct bio *bi)
8382 if (bio_data_dir(bi) != WRITE)
8384 WARN_ON_ONCE(mddev->in_sync || mddev->ro);
8385 percpu_ref_get(&mddev->writes_pending);
8387 EXPORT_SYMBOL(md_write_inc);
8389 void md_write_end(struct mddev *mddev)
8391 percpu_ref_put(&mddev->writes_pending);
8393 if (mddev->safemode == 2)
8394 md_wakeup_thread(mddev->thread);
8395 else if (mddev->safemode_delay)
8396 /* The roundup() ensures this only performs locking once
8397 * every ->safemode_delay jiffies
8399 mod_timer(&mddev->safemode_timer,
8400 roundup(jiffies, mddev->safemode_delay) +
8401 mddev->safemode_delay);
8404 EXPORT_SYMBOL(md_write_end);
8406 /* md_allow_write(mddev)
8407 * Calling this ensures that the array is marked 'active' so that writes
8408 * may proceed without blocking. It is important to call this before
8409 * attempting a GFP_KERNEL allocation while holding the mddev lock.
8410 * Must be called with mddev_lock held.
8412 void md_allow_write(struct mddev *mddev)
8418 if (!mddev->pers->sync_request)
8421 spin_lock(&mddev->lock);
8422 if (mddev->in_sync) {
8424 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
8425 set_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
8426 if (mddev->safemode_delay &&
8427 mddev->safemode == 0)
8428 mddev->safemode = 1;
8429 spin_unlock(&mddev->lock);
8430 md_update_sb(mddev, 0);
8431 sysfs_notify_dirent_safe(mddev->sysfs_state);
8432 /* wait for the dirty state to be recorded in the metadata */
8433 wait_event(mddev->sb_wait,
8434 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags));
8436 spin_unlock(&mddev->lock);
8438 EXPORT_SYMBOL_GPL(md_allow_write);
8440 #define SYNC_MARKS 10
8441 #define SYNC_MARK_STEP (3*HZ)
8442 #define UPDATE_FREQUENCY (5*60*HZ)
8443 void md_do_sync(struct md_thread *thread)
8445 struct mddev *mddev = thread->mddev;
8446 struct mddev *mddev2;
8447 unsigned int currspeed = 0, window;
8448 sector_t max_sectors,j, io_sectors, recovery_done;
8449 unsigned long mark[SYNC_MARKS];
8450 unsigned long update_time;
8451 sector_t mark_cnt[SYNC_MARKS];
8453 struct list_head *tmp;
8454 sector_t last_check;
8456 struct md_rdev *rdev;
8457 char *desc, *action = NULL;
8458 struct blk_plug plug;
8461 /* just incase thread restarts... */
8462 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
8463 test_bit(MD_RECOVERY_WAIT, &mddev->recovery))
8465 if (mddev->ro) {/* never try to sync a read-only array */
8466 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8470 if (mddev_is_clustered(mddev)) {
8471 ret = md_cluster_ops->resync_start(mddev);
8475 set_bit(MD_CLUSTER_RESYNC_LOCKED, &mddev->flags);
8476 if (!(test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
8477 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) ||
8478 test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
8479 && ((unsigned long long)mddev->curr_resync_completed
8480 < (unsigned long long)mddev->resync_max_sectors))
8484 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
8485 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) {
8486 desc = "data-check";
8488 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
8489 desc = "requested-resync";
8493 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
8498 mddev->last_sync_action = action ?: desc;
8500 /* we overload curr_resync somewhat here.
8501 * 0 == not engaged in resync at all
8502 * 2 == checking that there is no conflict with another sync
8503 * 1 == like 2, but have yielded to allow conflicting resync to
8505 * other == active in resync - this many blocks
8507 * Before starting a resync we must have set curr_resync to
8508 * 2, and then checked that every "conflicting" array has curr_resync
8509 * less than ours. When we find one that is the same or higher
8510 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
8511 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
8512 * This will mean we have to start checking from the beginning again.
8517 int mddev2_minor = -1;
8518 mddev->curr_resync = 2;
8521 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8523 for_each_mddev(mddev2, tmp) {
8524 if (mddev2 == mddev)
8526 if (!mddev->parallel_resync
8527 && mddev2->curr_resync
8528 && match_mddev_units(mddev, mddev2)) {
8530 if (mddev < mddev2 && mddev->curr_resync == 2) {
8531 /* arbitrarily yield */
8532 mddev->curr_resync = 1;
8533 wake_up(&resync_wait);
8535 if (mddev > mddev2 && mddev->curr_resync == 1)
8536 /* no need to wait here, we can wait the next
8537 * time 'round when curr_resync == 2
8540 /* We need to wait 'interruptible' so as not to
8541 * contribute to the load average, and not to
8542 * be caught by 'softlockup'
8544 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
8545 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8546 mddev2->curr_resync >= mddev->curr_resync) {
8547 if (mddev2_minor != mddev2->md_minor) {
8548 mddev2_minor = mddev2->md_minor;
8549 pr_info("md: delaying %s of %s until %s has finished (they share one or more physical units)\n",
8550 desc, mdname(mddev),
8554 if (signal_pending(current))
8555 flush_signals(current);
8557 finish_wait(&resync_wait, &wq);
8560 finish_wait(&resync_wait, &wq);
8563 } while (mddev->curr_resync < 2);
8566 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
8567 /* resync follows the size requested by the personality,
8568 * which defaults to physical size, but can be virtual size
8570 max_sectors = mddev->resync_max_sectors;
8571 atomic64_set(&mddev->resync_mismatches, 0);
8572 /* we don't use the checkpoint if there's a bitmap */
8573 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
8574 j = mddev->resync_min;
8575 else if (!mddev->bitmap)
8576 j = mddev->recovery_cp;
8578 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) {
8579 max_sectors = mddev->resync_max_sectors;
8581 * If the original node aborts reshaping then we continue the
8582 * reshaping, so set j again to avoid restart reshape from the
8585 if (mddev_is_clustered(mddev) &&
8586 mddev->reshape_position != MaxSector)
8587 j = mddev->reshape_position;
8589 /* recovery follows the physical size of devices */
8590 max_sectors = mddev->dev_sectors;
8593 rdev_for_each_rcu(rdev, mddev)
8594 if (rdev->raid_disk >= 0 &&
8595 !test_bit(Journal, &rdev->flags) &&
8596 !test_bit(Faulty, &rdev->flags) &&
8597 !test_bit(In_sync, &rdev->flags) &&
8598 rdev->recovery_offset < j)
8599 j = rdev->recovery_offset;
8602 /* If there is a bitmap, we need to make sure all
8603 * writes that started before we added a spare
8604 * complete before we start doing a recovery.
8605 * Otherwise the write might complete and (via
8606 * bitmap_endwrite) set a bit in the bitmap after the
8607 * recovery has checked that bit and skipped that
8610 if (mddev->bitmap) {
8611 mddev->pers->quiesce(mddev, 1);
8612 mddev->pers->quiesce(mddev, 0);
8616 pr_info("md: %s of RAID array %s\n", desc, mdname(mddev));
8617 pr_debug("md: minimum _guaranteed_ speed: %d KB/sec/disk.\n", speed_min(mddev));
8618 pr_debug("md: using maximum available idle IO bandwidth (but not more than %d KB/sec) for %s.\n",
8619 speed_max(mddev), desc);
8621 is_mddev_idle(mddev, 1); /* this initializes IO event counters */
8624 for (m = 0; m < SYNC_MARKS; m++) {
8626 mark_cnt[m] = io_sectors;
8629 mddev->resync_mark = mark[last_mark];
8630 mddev->resync_mark_cnt = mark_cnt[last_mark];
8633 * Tune reconstruction:
8635 window = 32 * (PAGE_SIZE / 512);
8636 pr_debug("md: using %dk window, over a total of %lluk.\n",
8637 window/2, (unsigned long long)max_sectors/2);
8639 atomic_set(&mddev->recovery_active, 0);
8643 pr_debug("md: resuming %s of %s from checkpoint.\n",
8644 desc, mdname(mddev));
8645 mddev->curr_resync = j;
8647 mddev->curr_resync = 3; /* no longer delayed */
8648 mddev->curr_resync_completed = j;
8649 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
8650 md_new_event(mddev);
8651 update_time = jiffies;
8653 blk_start_plug(&plug);
8654 while (j < max_sectors) {
8659 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8660 ((mddev->curr_resync > mddev->curr_resync_completed &&
8661 (mddev->curr_resync - mddev->curr_resync_completed)
8662 > (max_sectors >> 4)) ||
8663 time_after_eq(jiffies, update_time + UPDATE_FREQUENCY) ||
8664 (j - mddev->curr_resync_completed)*2
8665 >= mddev->resync_max - mddev->curr_resync_completed ||
8666 mddev->curr_resync_completed > mddev->resync_max
8668 /* time to update curr_resync_completed */
8669 wait_event(mddev->recovery_wait,
8670 atomic_read(&mddev->recovery_active) == 0);
8671 mddev->curr_resync_completed = j;
8672 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) &&
8673 j > mddev->recovery_cp)
8674 mddev->recovery_cp = j;
8675 update_time = jiffies;
8676 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
8677 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
8680 while (j >= mddev->resync_max &&
8681 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
8682 /* As this condition is controlled by user-space,
8683 * we can block indefinitely, so use '_interruptible'
8684 * to avoid triggering warnings.
8686 flush_signals(current); /* just in case */
8687 wait_event_interruptible(mddev->recovery_wait,
8688 mddev->resync_max > j
8689 || test_bit(MD_RECOVERY_INTR,
8693 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8696 sectors = mddev->pers->sync_request(mddev, j, &skipped);
8698 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8702 if (!skipped) { /* actual IO requested */
8703 io_sectors += sectors;
8704 atomic_add(sectors, &mddev->recovery_active);
8707 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8711 if (j > max_sectors)
8712 /* when skipping, extra large numbers can be returned. */
8715 mddev->curr_resync = j;
8716 mddev->curr_mark_cnt = io_sectors;
8717 if (last_check == 0)
8718 /* this is the earliest that rebuild will be
8719 * visible in /proc/mdstat
8721 md_new_event(mddev);
8723 if (last_check + window > io_sectors || j == max_sectors)
8726 last_check = io_sectors;
8728 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
8730 int next = (last_mark+1) % SYNC_MARKS;
8732 mddev->resync_mark = mark[next];
8733 mddev->resync_mark_cnt = mark_cnt[next];
8734 mark[next] = jiffies;
8735 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
8739 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8743 * this loop exits only if either when we are slower than
8744 * the 'hard' speed limit, or the system was IO-idle for
8746 * the system might be non-idle CPU-wise, but we only care
8747 * about not overloading the IO subsystem. (things like an
8748 * e2fsck being done on the RAID array should execute fast)
8752 recovery_done = io_sectors - atomic_read(&mddev->recovery_active);
8753 currspeed = ((unsigned long)(recovery_done - mddev->resync_mark_cnt))/2
8754 /((jiffies-mddev->resync_mark)/HZ +1) +1;
8756 if (currspeed > speed_min(mddev)) {
8757 if (currspeed > speed_max(mddev)) {
8761 if (!is_mddev_idle(mddev, 0)) {
8763 * Give other IO more of a chance.
8764 * The faster the devices, the less we wait.
8766 wait_event(mddev->recovery_wait,
8767 !atomic_read(&mddev->recovery_active));
8771 pr_info("md: %s: %s %s.\n",mdname(mddev), desc,
8772 test_bit(MD_RECOVERY_INTR, &mddev->recovery)
8773 ? "interrupted" : "done");
8775 * this also signals 'finished resyncing' to md_stop
8777 blk_finish_plug(&plug);
8778 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
8780 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8781 !test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8782 mddev->curr_resync > 3) {
8783 mddev->curr_resync_completed = mddev->curr_resync;
8784 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
8786 mddev->pers->sync_request(mddev, max_sectors, &skipped);
8788 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
8789 mddev->curr_resync > 3) {
8790 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
8791 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
8792 if (mddev->curr_resync >= mddev->recovery_cp) {
8793 pr_debug("md: checkpointing %s of %s.\n",
8794 desc, mdname(mddev));
8795 if (test_bit(MD_RECOVERY_ERROR,
8797 mddev->recovery_cp =
8798 mddev->curr_resync_completed;
8800 mddev->recovery_cp =
8804 mddev->recovery_cp = MaxSector;
8806 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8807 mddev->curr_resync = MaxSector;
8808 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8809 test_bit(MD_RECOVERY_RECOVER, &mddev->recovery)) {
8811 rdev_for_each_rcu(rdev, mddev)
8812 if (rdev->raid_disk >= 0 &&
8813 mddev->delta_disks >= 0 &&
8814 !test_bit(Journal, &rdev->flags) &&
8815 !test_bit(Faulty, &rdev->flags) &&
8816 !test_bit(In_sync, &rdev->flags) &&
8817 rdev->recovery_offset < mddev->curr_resync)
8818 rdev->recovery_offset = mddev->curr_resync;
8824 /* set CHANGE_PENDING here since maybe another update is needed,
8825 * so other nodes are informed. It should be harmless for normal
8827 set_mask_bits(&mddev->sb_flags, 0,
8828 BIT(MD_SB_CHANGE_PENDING) | BIT(MD_SB_CHANGE_DEVS));
8830 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8831 !test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8832 mddev->delta_disks > 0 &&
8833 mddev->pers->finish_reshape &&
8834 mddev->pers->size &&
8836 mddev_lock_nointr(mddev);
8837 md_set_array_sectors(mddev, mddev->pers->size(mddev, 0, 0));
8838 mddev_unlock(mddev);
8839 if (!mddev_is_clustered(mddev)) {
8840 set_capacity(mddev->gendisk, mddev->array_sectors);
8841 revalidate_disk(mddev->gendisk);
8845 spin_lock(&mddev->lock);
8846 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
8847 /* We completed so min/max setting can be forgotten if used. */
8848 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
8849 mddev->resync_min = 0;
8850 mddev->resync_max = MaxSector;
8851 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
8852 mddev->resync_min = mddev->curr_resync_completed;
8853 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
8854 mddev->curr_resync = 0;
8855 spin_unlock(&mddev->lock);
8857 wake_up(&resync_wait);
8858 md_wakeup_thread(mddev->thread);
8861 EXPORT_SYMBOL_GPL(md_do_sync);
8863 static int remove_and_add_spares(struct mddev *mddev,
8864 struct md_rdev *this)
8866 struct md_rdev *rdev;
8869 bool remove_some = false;
8871 if (this && test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
8872 /* Mustn't remove devices when resync thread is running */
8875 rdev_for_each(rdev, mddev) {
8876 if ((this == NULL || rdev == this) &&
8877 rdev->raid_disk >= 0 &&
8878 !test_bit(Blocked, &rdev->flags) &&
8879 test_bit(Faulty, &rdev->flags) &&
8880 atomic_read(&rdev->nr_pending)==0) {
8881 /* Faulty non-Blocked devices with nr_pending == 0
8882 * never get nr_pending incremented,
8883 * never get Faulty cleared, and never get Blocked set.
8884 * So we can synchronize_rcu now rather than once per device
8887 set_bit(RemoveSynchronized, &rdev->flags);
8893 rdev_for_each(rdev, mddev) {
8894 if ((this == NULL || rdev == this) &&
8895 rdev->raid_disk >= 0 &&
8896 !test_bit(Blocked, &rdev->flags) &&
8897 ((test_bit(RemoveSynchronized, &rdev->flags) ||
8898 (!test_bit(In_sync, &rdev->flags) &&
8899 !test_bit(Journal, &rdev->flags))) &&
8900 atomic_read(&rdev->nr_pending)==0)) {
8901 if (mddev->pers->hot_remove_disk(
8902 mddev, rdev) == 0) {
8903 sysfs_unlink_rdev(mddev, rdev);
8904 rdev->saved_raid_disk = rdev->raid_disk;
8905 rdev->raid_disk = -1;
8909 if (remove_some && test_bit(RemoveSynchronized, &rdev->flags))
8910 clear_bit(RemoveSynchronized, &rdev->flags);
8913 if (removed && mddev->kobj.sd)
8914 sysfs_notify(&mddev->kobj, NULL, "degraded");
8916 if (this && removed)
8919 rdev_for_each(rdev, mddev) {
8920 if (this && this != rdev)
8922 if (test_bit(Candidate, &rdev->flags))
8924 if (rdev->raid_disk >= 0 &&
8925 !test_bit(In_sync, &rdev->flags) &&
8926 !test_bit(Journal, &rdev->flags) &&
8927 !test_bit(Faulty, &rdev->flags))
8929 if (rdev->raid_disk >= 0)
8931 if (test_bit(Faulty, &rdev->flags))
8933 if (!test_bit(Journal, &rdev->flags)) {
8935 ! (rdev->saved_raid_disk >= 0 &&
8936 !test_bit(Bitmap_sync, &rdev->flags)))
8939 rdev->recovery_offset = 0;
8942 hot_add_disk(mddev, rdev) == 0) {
8943 if (sysfs_link_rdev(mddev, rdev))
8944 /* failure here is OK */;
8945 if (!test_bit(Journal, &rdev->flags))
8947 md_new_event(mddev);
8948 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
8953 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
8957 static void md_start_sync(struct work_struct *ws)
8959 struct mddev *mddev = container_of(ws, struct mddev, del_work);
8961 mddev->sync_thread = md_register_thread(md_do_sync,
8964 if (!mddev->sync_thread) {
8965 pr_warn("%s: could not start resync thread...\n",
8967 /* leave the spares where they are, it shouldn't hurt */
8968 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8969 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
8970 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
8971 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
8972 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
8973 wake_up(&resync_wait);
8974 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
8976 if (mddev->sysfs_action)
8977 sysfs_notify_dirent_safe(mddev->sysfs_action);
8979 md_wakeup_thread(mddev->sync_thread);
8980 sysfs_notify_dirent_safe(mddev->sysfs_action);
8981 md_new_event(mddev);
8985 * This routine is regularly called by all per-raid-array threads to
8986 * deal with generic issues like resync and super-block update.
8987 * Raid personalities that don't have a thread (linear/raid0) do not
8988 * need this as they never do any recovery or update the superblock.
8990 * It does not do any resync itself, but rather "forks" off other threads
8991 * to do that as needed.
8992 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
8993 * "->recovery" and create a thread at ->sync_thread.
8994 * When the thread finishes it sets MD_RECOVERY_DONE
8995 * and wakeups up this thread which will reap the thread and finish up.
8996 * This thread also removes any faulty devices (with nr_pending == 0).
8998 * The overall approach is:
8999 * 1/ if the superblock needs updating, update it.
9000 * 2/ If a recovery thread is running, don't do anything else.
9001 * 3/ If recovery has finished, clean up, possibly marking spares active.
9002 * 4/ If there are any faulty devices, remove them.
9003 * 5/ If array is degraded, try to add spares devices
9004 * 6/ If array has spares or is not in-sync, start a resync thread.
9006 void md_check_recovery(struct mddev *mddev)
9008 if (test_bit(MD_ALLOW_SB_UPDATE, &mddev->flags) && mddev->sb_flags) {
9009 /* Write superblock - thread that called mddev_suspend()
9010 * holds reconfig_mutex for us.
9012 set_bit(MD_UPDATING_SB, &mddev->flags);
9013 smp_mb__after_atomic();
9014 if (test_bit(MD_ALLOW_SB_UPDATE, &mddev->flags))
9015 md_update_sb(mddev, 0);
9016 clear_bit_unlock(MD_UPDATING_SB, &mddev->flags);
9017 wake_up(&mddev->sb_wait);
9020 if (mddev->suspended)
9024 md_bitmap_daemon_work(mddev);
9026 if (signal_pending(current)) {
9027 if (mddev->pers->sync_request && !mddev->external) {
9028 pr_debug("md: %s in immediate safe mode\n",
9030 mddev->safemode = 2;
9032 flush_signals(current);
9035 if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
9038 (mddev->sb_flags & ~ (1<<MD_SB_CHANGE_PENDING)) ||
9039 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
9040 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
9041 (mddev->external == 0 && mddev->safemode == 1) ||
9042 (mddev->safemode == 2
9043 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
9047 if (mddev_trylock(mddev)) {
9049 bool try_set_sync = mddev->safemode != 0;
9051 if (!mddev->external && mddev->safemode == 1)
9052 mddev->safemode = 0;
9055 struct md_rdev *rdev;
9056 if (!mddev->external && mddev->in_sync)
9057 /* 'Blocked' flag not needed as failed devices
9058 * will be recorded if array switched to read/write.
9059 * Leaving it set will prevent the device
9060 * from being removed.
9062 rdev_for_each(rdev, mddev)
9063 clear_bit(Blocked, &rdev->flags);
9064 /* On a read-only array we can:
9065 * - remove failed devices
9066 * - add already-in_sync devices if the array itself
9068 * As we only add devices that are already in-sync,
9069 * we can activate the spares immediately.
9071 remove_and_add_spares(mddev, NULL);
9072 /* There is no thread, but we need to call
9073 * ->spare_active and clear saved_raid_disk
9075 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
9076 md_reap_sync_thread(mddev);
9077 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
9078 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
9079 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
9083 if (mddev_is_clustered(mddev)) {
9084 struct md_rdev *rdev, *tmp;
9085 /* kick the device if another node issued a
9088 rdev_for_each_safe(rdev, tmp, mddev) {
9089 if (test_and_clear_bit(ClusterRemove, &rdev->flags) &&
9090 rdev->raid_disk < 0)
9091 md_kick_rdev_from_array(rdev);
9095 if (try_set_sync && !mddev->external && !mddev->in_sync) {
9096 spin_lock(&mddev->lock);
9098 spin_unlock(&mddev->lock);
9101 if (mddev->sb_flags)
9102 md_update_sb(mddev, 0);
9104 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
9105 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
9106 /* resync/recovery still happening */
9107 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
9110 if (mddev->sync_thread) {
9111 md_reap_sync_thread(mddev);
9114 /* Set RUNNING before clearing NEEDED to avoid
9115 * any transients in the value of "sync_action".
9117 mddev->curr_resync_completed = 0;
9118 spin_lock(&mddev->lock);
9119 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
9120 spin_unlock(&mddev->lock);
9121 /* Clear some bits that don't mean anything, but
9124 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
9125 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
9127 if (!test_and_clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
9128 test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
9130 /* no recovery is running.
9131 * remove any failed drives, then
9132 * add spares if possible.
9133 * Spares are also removed and re-added, to allow
9134 * the personality to fail the re-add.
9137 if (mddev->reshape_position != MaxSector) {
9138 if (mddev->pers->check_reshape == NULL ||
9139 mddev->pers->check_reshape(mddev) != 0)
9140 /* Cannot proceed */
9142 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
9143 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
9144 } else if ((spares = remove_and_add_spares(mddev, NULL))) {
9145 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
9146 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
9147 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
9148 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
9149 } else if (mddev->recovery_cp < MaxSector) {
9150 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
9151 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
9152 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
9153 /* nothing to be done ... */
9156 if (mddev->pers->sync_request) {
9158 /* We are adding a device or devices to an array
9159 * which has the bitmap stored on all devices.
9160 * So make sure all bitmap pages get written
9162 md_bitmap_write_all(mddev->bitmap);
9164 INIT_WORK(&mddev->del_work, md_start_sync);
9165 queue_work(md_misc_wq, &mddev->del_work);
9169 if (!mddev->sync_thread) {
9170 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
9171 wake_up(&resync_wait);
9172 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
9174 if (mddev->sysfs_action)
9175 sysfs_notify_dirent_safe(mddev->sysfs_action);
9178 wake_up(&mddev->sb_wait);
9179 mddev_unlock(mddev);
9182 EXPORT_SYMBOL(md_check_recovery);
9184 void md_reap_sync_thread(struct mddev *mddev)
9186 struct md_rdev *rdev;
9187 sector_t old_dev_sectors = mddev->dev_sectors;
9188 bool is_reshaped = false;
9190 /* resync has finished, collect result */
9191 md_unregister_thread(&mddev->sync_thread);
9192 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
9193 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) &&
9194 mddev->degraded != mddev->raid_disks) {
9196 /* activate any spares */
9197 if (mddev->pers->spare_active(mddev)) {
9198 sysfs_notify(&mddev->kobj, NULL,
9200 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
9203 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
9204 mddev->pers->finish_reshape) {
9205 mddev->pers->finish_reshape(mddev);
9206 if (mddev_is_clustered(mddev))
9210 /* If array is no-longer degraded, then any saved_raid_disk
9211 * information must be scrapped.
9213 if (!mddev->degraded)
9214 rdev_for_each(rdev, mddev)
9215 rdev->saved_raid_disk = -1;
9217 md_update_sb(mddev, 1);
9218 /* MD_SB_CHANGE_PENDING should be cleared by md_update_sb, so we can
9219 * call resync_finish here if MD_CLUSTER_RESYNC_LOCKED is set by
9221 if (test_and_clear_bit(MD_CLUSTER_RESYNC_LOCKED, &mddev->flags))
9222 md_cluster_ops->resync_finish(mddev);
9223 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
9224 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
9225 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
9226 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
9227 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
9228 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
9230 * We call md_cluster_ops->update_size here because sync_size could
9231 * be changed by md_update_sb, and MD_RECOVERY_RESHAPE is cleared,
9232 * so it is time to update size across cluster.
9234 if (mddev_is_clustered(mddev) && is_reshaped
9235 && !test_bit(MD_CLOSING, &mddev->flags))
9236 md_cluster_ops->update_size(mddev, old_dev_sectors);
9237 wake_up(&resync_wait);
9238 /* flag recovery needed just to double check */
9239 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
9240 sysfs_notify_dirent_safe(mddev->sysfs_action);
9241 md_new_event(mddev);
9242 if (mddev->event_work.func)
9243 queue_work(md_misc_wq, &mddev->event_work);
9245 EXPORT_SYMBOL(md_reap_sync_thread);
9247 void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev)
9249 sysfs_notify_dirent_safe(rdev->sysfs_state);
9250 wait_event_timeout(rdev->blocked_wait,
9251 !test_bit(Blocked, &rdev->flags) &&
9252 !test_bit(BlockedBadBlocks, &rdev->flags),
9253 msecs_to_jiffies(5000));
9254 rdev_dec_pending(rdev, mddev);
9256 EXPORT_SYMBOL(md_wait_for_blocked_rdev);
9258 void md_finish_reshape(struct mddev *mddev)
9260 /* called be personality module when reshape completes. */
9261 struct md_rdev *rdev;
9263 rdev_for_each(rdev, mddev) {
9264 if (rdev->data_offset > rdev->new_data_offset)
9265 rdev->sectors += rdev->data_offset - rdev->new_data_offset;
9267 rdev->sectors -= rdev->new_data_offset - rdev->data_offset;
9268 rdev->data_offset = rdev->new_data_offset;
9271 EXPORT_SYMBOL(md_finish_reshape);
9273 /* Bad block management */
9275 /* Returns 1 on success, 0 on failure */
9276 int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
9279 struct mddev *mddev = rdev->mddev;
9282 s += rdev->new_data_offset;
9284 s += rdev->data_offset;
9285 rv = badblocks_set(&rdev->badblocks, s, sectors, 0);
9287 /* Make sure they get written out promptly */
9288 if (test_bit(ExternalBbl, &rdev->flags))
9289 sysfs_notify(&rdev->kobj, NULL,
9290 "unacknowledged_bad_blocks");
9291 sysfs_notify_dirent_safe(rdev->sysfs_state);
9292 set_mask_bits(&mddev->sb_flags, 0,
9293 BIT(MD_SB_CHANGE_CLEAN) | BIT(MD_SB_CHANGE_PENDING));
9294 md_wakeup_thread(rdev->mddev->thread);
9299 EXPORT_SYMBOL_GPL(rdev_set_badblocks);
9301 int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
9306 s += rdev->new_data_offset;
9308 s += rdev->data_offset;
9309 rv = badblocks_clear(&rdev->badblocks, s, sectors);
9310 if ((rv == 0) && test_bit(ExternalBbl, &rdev->flags))
9311 sysfs_notify(&rdev->kobj, NULL, "bad_blocks");
9314 EXPORT_SYMBOL_GPL(rdev_clear_badblocks);
9316 static int md_notify_reboot(struct notifier_block *this,
9317 unsigned long code, void *x)
9319 struct list_head *tmp;
9320 struct mddev *mddev;
9323 for_each_mddev(mddev, tmp) {
9324 if (mddev_trylock(mddev)) {
9326 __md_stop_writes(mddev);
9327 if (mddev->persistent)
9328 mddev->safemode = 2;
9329 mddev_unlock(mddev);
9334 * certain more exotic SCSI devices are known to be
9335 * volatile wrt too early system reboots. While the
9336 * right place to handle this issue is the given
9337 * driver, we do want to have a safe RAID driver ...
9345 static struct notifier_block md_notifier = {
9346 .notifier_call = md_notify_reboot,
9348 .priority = INT_MAX, /* before any real devices */
9351 static void md_geninit(void)
9353 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
9355 proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops);
9358 static int __init md_init(void)
9362 md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0);
9366 md_misc_wq = alloc_workqueue("md_misc", 0, 0);
9370 if ((ret = register_blkdev(MD_MAJOR, "md")) < 0)
9373 if ((ret = register_blkdev(0, "mdp")) < 0)
9377 blk_register_region(MKDEV(MD_MAJOR, 0), 512, THIS_MODULE,
9378 md_probe, NULL, NULL);
9379 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
9380 md_probe, NULL, NULL);
9382 register_reboot_notifier(&md_notifier);
9383 raid_table_header = register_sysctl_table(raid_root_table);
9389 unregister_blkdev(MD_MAJOR, "md");
9391 destroy_workqueue(md_misc_wq);
9393 destroy_workqueue(md_wq);
9398 static void check_sb_changes(struct mddev *mddev, struct md_rdev *rdev)
9400 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
9401 struct md_rdev *rdev2, *tmp;
9403 char b[BDEVNAME_SIZE];
9406 * If size is changed in another node then we need to
9407 * do resize as well.
9409 if (mddev->dev_sectors != le64_to_cpu(sb->size)) {
9410 ret = mddev->pers->resize(mddev, le64_to_cpu(sb->size));
9412 pr_info("md-cluster: resize failed\n");
9414 md_bitmap_update_sb(mddev->bitmap);
9417 /* Check for change of roles in the active devices */
9418 rdev_for_each_safe(rdev2, tmp, mddev) {
9419 if (test_bit(Faulty, &rdev2->flags))
9422 /* Check if the roles changed */
9423 role = le16_to_cpu(sb->dev_roles[rdev2->desc_nr]);
9425 if (test_bit(Candidate, &rdev2->flags)) {
9426 if (role == 0xfffe) {
9427 pr_info("md: Removing Candidate device %s because add failed\n", bdevname(rdev2->bdev,b));
9428 md_kick_rdev_from_array(rdev2);
9432 clear_bit(Candidate, &rdev2->flags);
9435 if (role != rdev2->raid_disk) {
9437 * got activated except reshape is happening.
9439 if (rdev2->raid_disk == -1 && role != 0xffff &&
9440 !(le32_to_cpu(sb->feature_map) &
9441 MD_FEATURE_RESHAPE_ACTIVE)) {
9442 rdev2->saved_raid_disk = role;
9443 ret = remove_and_add_spares(mddev, rdev2);
9444 pr_info("Activated spare: %s\n",
9445 bdevname(rdev2->bdev,b));
9446 /* wakeup mddev->thread here, so array could
9447 * perform resync with the new activated disk */
9448 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
9449 md_wakeup_thread(mddev->thread);
9452 * We just want to do the minimum to mark the disk
9453 * as faulty. The recovery is performed by the
9454 * one who initiated the error.
9456 if ((role == 0xfffe) || (role == 0xfffd)) {
9457 md_error(mddev, rdev2);
9458 clear_bit(Blocked, &rdev2->flags);
9463 if (mddev->raid_disks != le32_to_cpu(sb->raid_disks)) {
9464 ret = update_raid_disks(mddev, le32_to_cpu(sb->raid_disks));
9466 pr_warn("md: updating array disks failed. %d\n", ret);
9470 * Since mddev->delta_disks has already updated in update_raid_disks,
9471 * so it is time to check reshape.
9473 if (test_bit(MD_RESYNCING_REMOTE, &mddev->recovery) &&
9474 (le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
9476 * reshape is happening in the remote node, we need to
9477 * update reshape_position and call start_reshape.
9479 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
9480 if (mddev->pers->update_reshape_pos)
9481 mddev->pers->update_reshape_pos(mddev);
9482 if (mddev->pers->start_reshape)
9483 mddev->pers->start_reshape(mddev);
9484 } else if (test_bit(MD_RESYNCING_REMOTE, &mddev->recovery) &&
9485 mddev->reshape_position != MaxSector &&
9486 !(le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
9487 /* reshape is just done in another node. */
9488 mddev->reshape_position = MaxSector;
9489 if (mddev->pers->update_reshape_pos)
9490 mddev->pers->update_reshape_pos(mddev);
9493 /* Finally set the event to be up to date */
9494 mddev->events = le64_to_cpu(sb->events);
9497 static int read_rdev(struct mddev *mddev, struct md_rdev *rdev)
9500 struct page *swapout = rdev->sb_page;
9501 struct mdp_superblock_1 *sb;
9503 /* Store the sb page of the rdev in the swapout temporary
9504 * variable in case we err in the future
9506 rdev->sb_page = NULL;
9507 err = alloc_disk_sb(rdev);
9509 ClearPageUptodate(rdev->sb_page);
9510 rdev->sb_loaded = 0;
9511 err = super_types[mddev->major_version].
9512 load_super(rdev, NULL, mddev->minor_version);
9515 pr_warn("%s: %d Could not reload rdev(%d) err: %d. Restoring old values\n",
9516 __func__, __LINE__, rdev->desc_nr, err);
9518 put_page(rdev->sb_page);
9519 rdev->sb_page = swapout;
9520 rdev->sb_loaded = 1;
9524 sb = page_address(rdev->sb_page);
9525 /* Read the offset unconditionally, even if MD_FEATURE_RECOVERY_OFFSET
9529 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RECOVERY_OFFSET))
9530 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
9532 /* The other node finished recovery, call spare_active to set
9533 * device In_sync and mddev->degraded
9535 if (rdev->recovery_offset == MaxSector &&
9536 !test_bit(In_sync, &rdev->flags) &&
9537 mddev->pers->spare_active(mddev))
9538 sysfs_notify(&mddev->kobj, NULL, "degraded");
9544 void md_reload_sb(struct mddev *mddev, int nr)
9546 struct md_rdev *rdev = NULL, *iter;
9550 rdev_for_each_rcu(iter, mddev) {
9551 if (iter->desc_nr == nr) {
9558 pr_warn("%s: %d Could not find rdev with nr %d\n", __func__, __LINE__, nr);
9562 err = read_rdev(mddev, rdev);
9566 check_sb_changes(mddev, rdev);
9568 /* Read all rdev's to update recovery_offset */
9569 rdev_for_each_rcu(rdev, mddev) {
9570 if (!test_bit(Faulty, &rdev->flags))
9571 read_rdev(mddev, rdev);
9574 EXPORT_SYMBOL(md_reload_sb);
9579 * Searches all registered partitions for autorun RAID arrays
9583 static DEFINE_MUTEX(detected_devices_mutex);
9584 static LIST_HEAD(all_detected_devices);
9585 struct detected_devices_node {
9586 struct list_head list;
9590 void md_autodetect_dev(dev_t dev)
9592 struct detected_devices_node *node_detected_dev;
9594 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
9595 if (node_detected_dev) {
9596 node_detected_dev->dev = dev;
9597 mutex_lock(&detected_devices_mutex);
9598 list_add_tail(&node_detected_dev->list, &all_detected_devices);
9599 mutex_unlock(&detected_devices_mutex);
9603 static void autostart_arrays(int part)
9605 struct md_rdev *rdev;
9606 struct detected_devices_node *node_detected_dev;
9608 int i_scanned, i_passed;
9613 pr_info("md: Autodetecting RAID arrays.\n");
9615 mutex_lock(&detected_devices_mutex);
9616 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
9618 node_detected_dev = list_entry(all_detected_devices.next,
9619 struct detected_devices_node, list);
9620 list_del(&node_detected_dev->list);
9621 dev = node_detected_dev->dev;
9622 kfree(node_detected_dev);
9623 mutex_unlock(&detected_devices_mutex);
9624 rdev = md_import_device(dev,0, 90);
9625 mutex_lock(&detected_devices_mutex);
9629 if (test_bit(Faulty, &rdev->flags))
9632 set_bit(AutoDetected, &rdev->flags);
9633 list_add(&rdev->same_set, &pending_raid_disks);
9636 mutex_unlock(&detected_devices_mutex);
9638 pr_debug("md: Scanned %d and added %d devices.\n", i_scanned, i_passed);
9640 autorun_devices(part);
9643 #endif /* !MODULE */
9645 static __exit void md_exit(void)
9647 struct mddev *mddev;
9648 struct list_head *tmp;
9651 blk_unregister_region(MKDEV(MD_MAJOR,0), 512);
9652 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
9654 unregister_blkdev(MD_MAJOR,"md");
9655 unregister_blkdev(mdp_major, "mdp");
9656 unregister_reboot_notifier(&md_notifier);
9657 unregister_sysctl_table(raid_table_header);
9659 /* We cannot unload the modules while some process is
9660 * waiting for us in select() or poll() - wake them up
9663 while (waitqueue_active(&md_event_waiters)) {
9664 /* not safe to leave yet */
9665 wake_up(&md_event_waiters);
9669 remove_proc_entry("mdstat", NULL);
9671 for_each_mddev(mddev, tmp) {
9672 export_array(mddev);
9674 mddev->hold_active = 0;
9676 * for_each_mddev() will call mddev_put() at the end of each
9677 * iteration. As the mddev is now fully clear, this will
9678 * schedule the mddev for destruction by a workqueue, and the
9679 * destroy_workqueue() below will wait for that to complete.
9682 destroy_workqueue(md_misc_wq);
9683 destroy_workqueue(md_wq);
9686 subsys_initcall(md_init);
9687 module_exit(md_exit)
9689 static int get_ro(char *buffer, const struct kernel_param *kp)
9691 return sprintf(buffer, "%d", start_readonly);
9693 static int set_ro(const char *val, const struct kernel_param *kp)
9695 return kstrtouint(val, 10, (unsigned int *)&start_readonly);
9698 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
9699 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
9700 module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR);
9701 module_param(create_on_open, bool, S_IRUSR|S_IWUSR);
9703 MODULE_LICENSE("GPL");
9704 MODULE_DESCRIPTION("MD RAID framework");
9706 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);