2 md.c : Multiple Devices driver for Linux
3 Copyright (C) 1998, 1999, 2000 Ingo Molnar
5 completely rewritten, based on the MD driver code from Marc Zyngier
9 - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar
10 - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com>
11 - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net>
12 - kerneld support by Boris Tobotras <boris@xtalk.msk.su>
13 - kmod support by: Cyrus Durgin
14 - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com>
15 - Devfs support by Richard Gooch <rgooch@atnf.csiro.au>
17 - lots of fixes and improvements to the RAID1/RAID5 and generic
18 RAID code (such as request based resynchronization):
20 Neil Brown <neilb@cse.unsw.edu.au>.
22 - persistent bitmap code
23 Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.
25 This program is free software; you can redistribute it and/or modify
26 it under the terms of the GNU General Public License as published by
27 the Free Software Foundation; either version 2, or (at your option)
30 You should have received a copy of the GNU General Public License
31 (for example /usr/src/linux/COPYING); if not, write to the Free
32 Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
35 #include <linux/kthread.h>
36 #include <linux/blkdev.h>
37 #include <linux/sysctl.h>
38 #include <linux/seq_file.h>
40 #include <linux/poll.h>
41 #include <linux/ctype.h>
42 #include <linux/string.h>
43 #include <linux/hdreg.h>
44 #include <linux/proc_fs.h>
45 #include <linux/random.h>
46 #include <linux/module.h>
47 #include <linux/reboot.h>
48 #include <linux/file.h>
49 #include <linux/compat.h>
50 #include <linux/delay.h>
51 #include <linux/raid/md_p.h>
52 #include <linux/raid/md_u.h>
53 #include <linux/slab.h>
58 static void autostart_arrays(int part);
61 /* pers_list is a list of registered personalities protected
63 * pers_lock does extra service to protect accesses to
64 * mddev->thread when the mutex cannot be held.
66 static LIST_HEAD(pers_list);
67 static DEFINE_SPINLOCK(pers_lock);
69 static void md_print_devices(void);
71 static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
72 static struct workqueue_struct *md_wq;
73 static struct workqueue_struct *md_misc_wq;
75 static int remove_and_add_spares(struct mddev *mddev,
76 struct md_rdev *this);
78 #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
81 * Default number of read corrections we'll attempt on an rdev
82 * before ejecting it from the array. We divide the read error
83 * count by 2 for every hour elapsed between read errors.
85 #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
87 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
88 * is 1000 KB/sec, so the extra system load does not show up that much.
89 * Increase it if you want to have more _guaranteed_ speed. Note that
90 * the RAID driver will use the maximum available bandwidth if the IO
91 * subsystem is idle. There is also an 'absolute maximum' reconstruction
92 * speed limit - in case reconstruction slows down your system despite
95 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
96 * or /sys/block/mdX/md/sync_speed_{min,max}
99 static int sysctl_speed_limit_min = 1000;
100 static int sysctl_speed_limit_max = 200000;
101 static inline int speed_min(struct mddev *mddev)
103 return mddev->sync_speed_min ?
104 mddev->sync_speed_min : sysctl_speed_limit_min;
107 static inline int speed_max(struct mddev *mddev)
109 return mddev->sync_speed_max ?
110 mddev->sync_speed_max : sysctl_speed_limit_max;
113 static struct ctl_table_header *raid_table_header;
115 static struct ctl_table raid_table[] = {
117 .procname = "speed_limit_min",
118 .data = &sysctl_speed_limit_min,
119 .maxlen = sizeof(int),
120 .mode = S_IRUGO|S_IWUSR,
121 .proc_handler = proc_dointvec,
124 .procname = "speed_limit_max",
125 .data = &sysctl_speed_limit_max,
126 .maxlen = sizeof(int),
127 .mode = S_IRUGO|S_IWUSR,
128 .proc_handler = proc_dointvec,
133 static struct ctl_table raid_dir_table[] = {
137 .mode = S_IRUGO|S_IXUGO,
143 static struct ctl_table raid_root_table[] = {
148 .child = raid_dir_table,
153 static const struct block_device_operations md_fops;
155 static int start_readonly;
158 * like bio_clone, but with a local bio set
161 struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs,
166 if (!mddev || !mddev->bio_set)
167 return bio_alloc(gfp_mask, nr_iovecs);
169 b = bio_alloc_bioset(gfp_mask, nr_iovecs, mddev->bio_set);
174 EXPORT_SYMBOL_GPL(bio_alloc_mddev);
176 struct bio *bio_clone_mddev(struct bio *bio, gfp_t gfp_mask,
179 if (!mddev || !mddev->bio_set)
180 return bio_clone(bio, gfp_mask);
182 return bio_clone_bioset(bio, gfp_mask, mddev->bio_set);
184 EXPORT_SYMBOL_GPL(bio_clone_mddev);
187 * We have a system wide 'event count' that is incremented
188 * on any 'interesting' event, and readers of /proc/mdstat
189 * can use 'poll' or 'select' to find out when the event
193 * start array, stop array, error, add device, remove device,
194 * start build, activate spare
196 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
197 static atomic_t md_event_count;
198 void md_new_event(struct mddev *mddev)
200 atomic_inc(&md_event_count);
201 wake_up(&md_event_waiters);
203 EXPORT_SYMBOL_GPL(md_new_event);
205 /* Alternate version that can be called from interrupts
206 * when calling sysfs_notify isn't needed.
208 static void md_new_event_inintr(struct mddev *mddev)
210 atomic_inc(&md_event_count);
211 wake_up(&md_event_waiters);
215 * Enables to iterate over all existing md arrays
216 * all_mddevs_lock protects this list.
218 static LIST_HEAD(all_mddevs);
219 static DEFINE_SPINLOCK(all_mddevs_lock);
223 * iterates through all used mddevs in the system.
224 * We take care to grab the all_mddevs_lock whenever navigating
225 * the list, and to always hold a refcount when unlocked.
226 * Any code which breaks out of this loop while own
227 * a reference to the current mddev and must mddev_put it.
229 #define for_each_mddev(_mddev,_tmp) \
231 for (({ spin_lock(&all_mddevs_lock); \
232 _tmp = all_mddevs.next; \
234 ({ if (_tmp != &all_mddevs) \
235 mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\
236 spin_unlock(&all_mddevs_lock); \
237 if (_mddev) mddev_put(_mddev); \
238 _mddev = list_entry(_tmp, struct mddev, all_mddevs); \
239 _tmp != &all_mddevs;}); \
240 ({ spin_lock(&all_mddevs_lock); \
241 _tmp = _tmp->next;}) \
245 /* Rather than calling directly into the personality make_request function,
246 * IO requests come here first so that we can check if the device is
247 * being suspended pending a reconfiguration.
248 * We hold a refcount over the call to ->make_request. By the time that
249 * call has finished, the bio has been linked into some internal structure
250 * and so is visible to ->quiesce(), so we don't need the refcount any more.
252 static void md_make_request(struct request_queue *q, struct bio *bio)
254 const int rw = bio_data_dir(bio);
255 struct mddev *mddev = q->queuedata;
257 unsigned int sectors;
259 if (mddev == NULL || mddev->pers == NULL
264 if (mddev->ro == 1 && unlikely(rw == WRITE)) {
265 bio_endio(bio, bio_sectors(bio) == 0 ? 0 : -EROFS);
268 smp_rmb(); /* Ensure implications of 'active' are visible */
270 if (mddev->suspended) {
273 prepare_to_wait(&mddev->sb_wait, &__wait,
274 TASK_UNINTERRUPTIBLE);
275 if (!mddev->suspended)
281 finish_wait(&mddev->sb_wait, &__wait);
283 atomic_inc(&mddev->active_io);
287 * save the sectors now since our bio can
288 * go away inside make_request
290 sectors = bio_sectors(bio);
291 mddev->pers->make_request(mddev, bio);
293 cpu = part_stat_lock();
294 part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]);
295 part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw], sectors);
298 if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended)
299 wake_up(&mddev->sb_wait);
302 /* mddev_suspend makes sure no new requests are submitted
303 * to the device, and that any requests that have been submitted
304 * are completely handled.
305 * Once ->stop is called and completes, the module will be completely
308 void mddev_suspend(struct mddev *mddev)
310 BUG_ON(mddev->suspended);
311 mddev->suspended = 1;
313 wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0);
314 mddev->pers->quiesce(mddev, 1);
316 del_timer_sync(&mddev->safemode_timer);
318 EXPORT_SYMBOL_GPL(mddev_suspend);
320 void mddev_resume(struct mddev *mddev)
322 mddev->suspended = 0;
323 wake_up(&mddev->sb_wait);
324 mddev->pers->quiesce(mddev, 0);
326 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
327 md_wakeup_thread(mddev->thread);
328 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
330 EXPORT_SYMBOL_GPL(mddev_resume);
332 int mddev_congested(struct mddev *mddev, int bits)
334 return mddev->suspended;
336 EXPORT_SYMBOL(mddev_congested);
339 * Generic flush handling for md
342 static void md_end_flush(struct bio *bio, int err)
344 struct md_rdev *rdev = bio->bi_private;
345 struct mddev *mddev = rdev->mddev;
347 rdev_dec_pending(rdev, mddev);
349 if (atomic_dec_and_test(&mddev->flush_pending)) {
350 /* The pre-request flush has finished */
351 queue_work(md_wq, &mddev->flush_work);
356 static void md_submit_flush_data(struct work_struct *ws);
358 static void submit_flushes(struct work_struct *ws)
360 struct mddev *mddev = container_of(ws, struct mddev, flush_work);
361 struct md_rdev *rdev;
363 INIT_WORK(&mddev->flush_work, md_submit_flush_data);
364 atomic_set(&mddev->flush_pending, 1);
366 rdev_for_each_rcu(rdev, mddev)
367 if (rdev->raid_disk >= 0 &&
368 !test_bit(Faulty, &rdev->flags)) {
369 /* Take two references, one is dropped
370 * when request finishes, one after
371 * we reclaim rcu_read_lock
374 atomic_inc(&rdev->nr_pending);
375 atomic_inc(&rdev->nr_pending);
377 bi = bio_alloc_mddev(GFP_NOIO, 0, mddev);
378 bi->bi_end_io = md_end_flush;
379 bi->bi_private = rdev;
380 bi->bi_bdev = rdev->bdev;
381 atomic_inc(&mddev->flush_pending);
382 submit_bio(WRITE_FLUSH, bi);
384 rdev_dec_pending(rdev, mddev);
387 if (atomic_dec_and_test(&mddev->flush_pending))
388 queue_work(md_wq, &mddev->flush_work);
391 static void md_submit_flush_data(struct work_struct *ws)
393 struct mddev *mddev = container_of(ws, struct mddev, flush_work);
394 struct bio *bio = mddev->flush_bio;
396 if (bio->bi_size == 0)
397 /* an empty barrier - all done */
400 bio->bi_rw &= ~REQ_FLUSH;
401 mddev->pers->make_request(mddev, bio);
404 mddev->flush_bio = NULL;
405 wake_up(&mddev->sb_wait);
408 void md_flush_request(struct mddev *mddev, struct bio *bio)
410 spin_lock_irq(&mddev->write_lock);
411 wait_event_lock_irq(mddev->sb_wait,
414 mddev->flush_bio = bio;
415 spin_unlock_irq(&mddev->write_lock);
417 INIT_WORK(&mddev->flush_work, submit_flushes);
418 queue_work(md_wq, &mddev->flush_work);
420 EXPORT_SYMBOL(md_flush_request);
422 void md_unplug(struct blk_plug_cb *cb, bool from_schedule)
424 struct mddev *mddev = cb->data;
425 md_wakeup_thread(mddev->thread);
428 EXPORT_SYMBOL(md_unplug);
430 static inline struct mddev *mddev_get(struct mddev *mddev)
432 atomic_inc(&mddev->active);
436 static void mddev_delayed_delete(struct work_struct *ws);
438 static void mddev_put(struct mddev *mddev)
440 struct bio_set *bs = NULL;
442 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
444 if (!mddev->raid_disks && list_empty(&mddev->disks) &&
445 mddev->ctime == 0 && !mddev->hold_active) {
446 /* Array is not configured at all, and not held active,
448 list_del_init(&mddev->all_mddevs);
450 mddev->bio_set = NULL;
451 if (mddev->gendisk) {
452 /* We did a probe so need to clean up. Call
453 * queue_work inside the spinlock so that
454 * flush_workqueue() after mddev_find will
455 * succeed in waiting for the work to be done.
457 INIT_WORK(&mddev->del_work, mddev_delayed_delete);
458 queue_work(md_misc_wq, &mddev->del_work);
462 spin_unlock(&all_mddevs_lock);
467 void mddev_init(struct mddev *mddev)
469 mutex_init(&mddev->open_mutex);
470 mutex_init(&mddev->reconfig_mutex);
471 mutex_init(&mddev->bitmap_info.mutex);
472 INIT_LIST_HEAD(&mddev->disks);
473 INIT_LIST_HEAD(&mddev->all_mddevs);
474 init_timer(&mddev->safemode_timer);
475 atomic_set(&mddev->active, 1);
476 atomic_set(&mddev->openers, 0);
477 atomic_set(&mddev->active_io, 0);
478 spin_lock_init(&mddev->write_lock);
479 atomic_set(&mddev->flush_pending, 0);
480 init_waitqueue_head(&mddev->sb_wait);
481 init_waitqueue_head(&mddev->recovery_wait);
482 mddev->reshape_position = MaxSector;
483 mddev->reshape_backwards = 0;
484 mddev->last_sync_action = "none";
485 mddev->resync_min = 0;
486 mddev->resync_max = MaxSector;
487 mddev->level = LEVEL_NONE;
489 EXPORT_SYMBOL_GPL(mddev_init);
491 static struct mddev * mddev_find(dev_t unit)
493 struct mddev *mddev, *new = NULL;
495 if (unit && MAJOR(unit) != MD_MAJOR)
496 unit &= ~((1<<MdpMinorShift)-1);
499 spin_lock(&all_mddevs_lock);
502 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
503 if (mddev->unit == unit) {
505 spin_unlock(&all_mddevs_lock);
511 list_add(&new->all_mddevs, &all_mddevs);
512 spin_unlock(&all_mddevs_lock);
513 new->hold_active = UNTIL_IOCTL;
517 /* find an unused unit number */
518 static int next_minor = 512;
519 int start = next_minor;
523 dev = MKDEV(MD_MAJOR, next_minor);
525 if (next_minor > MINORMASK)
527 if (next_minor == start) {
528 /* Oh dear, all in use. */
529 spin_unlock(&all_mddevs_lock);
535 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
536 if (mddev->unit == dev) {
542 new->md_minor = MINOR(dev);
543 new->hold_active = UNTIL_STOP;
544 list_add(&new->all_mddevs, &all_mddevs);
545 spin_unlock(&all_mddevs_lock);
548 spin_unlock(&all_mddevs_lock);
550 new = kzalloc(sizeof(*new), GFP_KERNEL);
555 if (MAJOR(unit) == MD_MAJOR)
556 new->md_minor = MINOR(unit);
558 new->md_minor = MINOR(unit) >> MdpMinorShift;
565 static inline int __must_check mddev_lock(struct mddev * mddev)
567 return mutex_lock_interruptible(&mddev->reconfig_mutex);
570 /* Sometimes we need to take the lock in a situation where
571 * failure due to interrupts is not acceptable.
573 static inline void mddev_lock_nointr(struct mddev * mddev)
575 mutex_lock(&mddev->reconfig_mutex);
578 static inline int mddev_is_locked(struct mddev *mddev)
580 return mutex_is_locked(&mddev->reconfig_mutex);
583 static inline int mddev_trylock(struct mddev * mddev)
585 return mutex_trylock(&mddev->reconfig_mutex);
588 static struct attribute_group md_redundancy_group;
590 static void mddev_unlock(struct mddev * mddev)
592 if (mddev->to_remove) {
593 /* These cannot be removed under reconfig_mutex as
594 * an access to the files will try to take reconfig_mutex
595 * while holding the file unremovable, which leads to
597 * So hold set sysfs_active while the remove in happeing,
598 * and anything else which might set ->to_remove or my
599 * otherwise change the sysfs namespace will fail with
600 * -EBUSY if sysfs_active is still set.
601 * We set sysfs_active under reconfig_mutex and elsewhere
602 * test it under the same mutex to ensure its correct value
605 struct attribute_group *to_remove = mddev->to_remove;
606 mddev->to_remove = NULL;
607 mddev->sysfs_active = 1;
608 mutex_unlock(&mddev->reconfig_mutex);
610 if (mddev->kobj.sd) {
611 if (to_remove != &md_redundancy_group)
612 sysfs_remove_group(&mddev->kobj, to_remove);
613 if (mddev->pers == NULL ||
614 mddev->pers->sync_request == NULL) {
615 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
616 if (mddev->sysfs_action)
617 sysfs_put(mddev->sysfs_action);
618 mddev->sysfs_action = NULL;
621 mddev->sysfs_active = 0;
623 mutex_unlock(&mddev->reconfig_mutex);
625 /* As we've dropped the mutex we need a spinlock to
626 * make sure the thread doesn't disappear
628 spin_lock(&pers_lock);
629 md_wakeup_thread(mddev->thread);
630 spin_unlock(&pers_lock);
633 static struct md_rdev * find_rdev_nr(struct mddev *mddev, int nr)
635 struct md_rdev *rdev;
637 rdev_for_each(rdev, mddev)
638 if (rdev->desc_nr == nr)
644 static struct md_rdev *find_rdev_nr_rcu(struct mddev *mddev, int nr)
646 struct md_rdev *rdev;
648 rdev_for_each_rcu(rdev, mddev)
649 if (rdev->desc_nr == nr)
655 static struct md_rdev *find_rdev(struct mddev *mddev, dev_t dev)
657 struct md_rdev *rdev;
659 rdev_for_each(rdev, mddev)
660 if (rdev->bdev->bd_dev == dev)
666 static struct md_rdev *find_rdev_rcu(struct mddev *mddev, dev_t dev)
668 struct md_rdev *rdev;
670 rdev_for_each_rcu(rdev, mddev)
671 if (rdev->bdev->bd_dev == dev)
677 static struct md_personality *find_pers(int level, char *clevel)
679 struct md_personality *pers;
680 list_for_each_entry(pers, &pers_list, list) {
681 if (level != LEVEL_NONE && pers->level == level)
683 if (strcmp(pers->name, clevel)==0)
689 /* return the offset of the super block in 512byte sectors */
690 static inline sector_t calc_dev_sboffset(struct md_rdev *rdev)
692 sector_t num_sectors = i_size_read(rdev->bdev->bd_inode) / 512;
693 return MD_NEW_SIZE_SECTORS(num_sectors);
696 static int alloc_disk_sb(struct md_rdev * rdev)
701 rdev->sb_page = alloc_page(GFP_KERNEL);
702 if (!rdev->sb_page) {
703 printk(KERN_ALERT "md: out of memory.\n");
710 void md_rdev_clear(struct md_rdev *rdev)
713 put_page(rdev->sb_page);
715 rdev->sb_page = NULL;
720 put_page(rdev->bb_page);
721 rdev->bb_page = NULL;
723 kfree(rdev->badblocks.page);
724 rdev->badblocks.page = NULL;
726 EXPORT_SYMBOL_GPL(md_rdev_clear);
728 static void super_written(struct bio *bio, int error)
730 struct md_rdev *rdev = bio->bi_private;
731 struct mddev *mddev = rdev->mddev;
733 if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) {
734 printk("md: super_written gets error=%d, uptodate=%d\n",
735 error, test_bit(BIO_UPTODATE, &bio->bi_flags));
736 WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags));
737 md_error(mddev, rdev);
740 if (atomic_dec_and_test(&mddev->pending_writes))
741 wake_up(&mddev->sb_wait);
745 void md_super_write(struct mddev *mddev, struct md_rdev *rdev,
746 sector_t sector, int size, struct page *page)
748 /* write first size bytes of page to sector of rdev
749 * Increment mddev->pending_writes before returning
750 * and decrement it on completion, waking up sb_wait
751 * if zero is reached.
752 * If an error occurred, call md_error
754 struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, mddev);
756 bio->bi_bdev = rdev->meta_bdev ? rdev->meta_bdev : rdev->bdev;
757 bio->bi_sector = sector;
758 bio_add_page(bio, page, size, 0);
759 bio->bi_private = rdev;
760 bio->bi_end_io = super_written;
762 atomic_inc(&mddev->pending_writes);
763 submit_bio(WRITE_FLUSH_FUA, bio);
766 void md_super_wait(struct mddev *mddev)
768 /* wait for all superblock writes that were scheduled to complete */
771 prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE);
772 if (atomic_read(&mddev->pending_writes)==0)
776 finish_wait(&mddev->sb_wait, &wq);
779 static void bi_complete(struct bio *bio, int error)
781 complete((struct completion*)bio->bi_private);
784 int sync_page_io(struct md_rdev *rdev, sector_t sector, int size,
785 struct page *page, int rw, bool metadata_op)
787 struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, rdev->mddev);
788 struct completion event;
793 bio->bi_bdev = (metadata_op && rdev->meta_bdev) ?
794 rdev->meta_bdev : rdev->bdev;
796 bio->bi_sector = sector + rdev->sb_start;
797 else if (rdev->mddev->reshape_position != MaxSector &&
798 (rdev->mddev->reshape_backwards ==
799 (sector >= rdev->mddev->reshape_position)))
800 bio->bi_sector = sector + rdev->new_data_offset;
802 bio->bi_sector = sector + rdev->data_offset;
803 bio_add_page(bio, page, size, 0);
804 init_completion(&event);
805 bio->bi_private = &event;
806 bio->bi_end_io = bi_complete;
808 wait_for_completion(&event);
810 ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
814 EXPORT_SYMBOL_GPL(sync_page_io);
816 static int read_disk_sb(struct md_rdev * rdev, int size)
818 char b[BDEVNAME_SIZE];
819 if (!rdev->sb_page) {
827 if (!sync_page_io(rdev, 0, size, rdev->sb_page, READ, true))
833 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
834 bdevname(rdev->bdev,b));
838 static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
840 return sb1->set_uuid0 == sb2->set_uuid0 &&
841 sb1->set_uuid1 == sb2->set_uuid1 &&
842 sb1->set_uuid2 == sb2->set_uuid2 &&
843 sb1->set_uuid3 == sb2->set_uuid3;
846 static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
849 mdp_super_t *tmp1, *tmp2;
851 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
852 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
854 if (!tmp1 || !tmp2) {
856 printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n");
864 * nr_disks is not constant
869 ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0);
877 static u32 md_csum_fold(u32 csum)
879 csum = (csum & 0xffff) + (csum >> 16);
880 return (csum & 0xffff) + (csum >> 16);
883 static unsigned int calc_sb_csum(mdp_super_t * sb)
886 u32 *sb32 = (u32*)sb;
888 unsigned int disk_csum, csum;
890 disk_csum = sb->sb_csum;
893 for (i = 0; i < MD_SB_BYTES/4 ; i++)
895 csum = (newcsum & 0xffffffff) + (newcsum>>32);
899 /* This used to use csum_partial, which was wrong for several
900 * reasons including that different results are returned on
901 * different architectures. It isn't critical that we get exactly
902 * the same return value as before (we always csum_fold before
903 * testing, and that removes any differences). However as we
904 * know that csum_partial always returned a 16bit value on
905 * alphas, do a fold to maximise conformity to previous behaviour.
907 sb->sb_csum = md_csum_fold(disk_csum);
909 sb->sb_csum = disk_csum;
916 * Handle superblock details.
917 * We want to be able to handle multiple superblock formats
918 * so we have a common interface to them all, and an array of
919 * different handlers.
920 * We rely on user-space to write the initial superblock, and support
921 * reading and updating of superblocks.
922 * Interface methods are:
923 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version)
924 * loads and validates a superblock on dev.
925 * if refdev != NULL, compare superblocks on both devices
927 * 0 - dev has a superblock that is compatible with refdev
928 * 1 - dev has a superblock that is compatible and newer than refdev
929 * so dev should be used as the refdev in future
930 * -EINVAL superblock incompatible or invalid
931 * -othererror e.g. -EIO
933 * int validate_super(struct mddev *mddev, struct md_rdev *dev)
934 * Verify that dev is acceptable into mddev.
935 * The first time, mddev->raid_disks will be 0, and data from
936 * dev should be merged in. Subsequent calls check that dev
937 * is new enough. Return 0 or -EINVAL
939 * void sync_super(struct mddev *mddev, struct md_rdev *dev)
940 * Update the superblock for rdev with data in mddev
941 * This does not write to disc.
947 struct module *owner;
948 int (*load_super)(struct md_rdev *rdev,
949 struct md_rdev *refdev,
951 int (*validate_super)(struct mddev *mddev,
952 struct md_rdev *rdev);
953 void (*sync_super)(struct mddev *mddev,
954 struct md_rdev *rdev);
955 unsigned long long (*rdev_size_change)(struct md_rdev *rdev,
956 sector_t num_sectors);
957 int (*allow_new_offset)(struct md_rdev *rdev,
958 unsigned long long new_offset);
962 * Check that the given mddev has no bitmap.
964 * This function is called from the run method of all personalities that do not
965 * support bitmaps. It prints an error message and returns non-zero if mddev
966 * has a bitmap. Otherwise, it returns 0.
969 int md_check_no_bitmap(struct mddev *mddev)
971 if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset)
973 printk(KERN_ERR "%s: bitmaps are not supported for %s\n",
974 mdname(mddev), mddev->pers->name);
977 EXPORT_SYMBOL(md_check_no_bitmap);
980 * load_super for 0.90.0
982 static int super_90_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
984 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
989 * Calculate the position of the superblock (512byte sectors),
990 * it's at the end of the disk.
992 * It also happens to be a multiple of 4Kb.
994 rdev->sb_start = calc_dev_sboffset(rdev);
996 ret = read_disk_sb(rdev, MD_SB_BYTES);
1001 bdevname(rdev->bdev, b);
1002 sb = page_address(rdev->sb_page);
1004 if (sb->md_magic != MD_SB_MAGIC) {
1005 printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
1010 if (sb->major_version != 0 ||
1011 sb->minor_version < 90 ||
1012 sb->minor_version > 91) {
1013 printk(KERN_WARNING "Bad version number %d.%d on %s\n",
1014 sb->major_version, sb->minor_version,
1019 if (sb->raid_disks <= 0)
1022 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
1023 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
1028 rdev->preferred_minor = sb->md_minor;
1029 rdev->data_offset = 0;
1030 rdev->new_data_offset = 0;
1031 rdev->sb_size = MD_SB_BYTES;
1032 rdev->badblocks.shift = -1;
1034 if (sb->level == LEVEL_MULTIPATH)
1037 rdev->desc_nr = sb->this_disk.number;
1043 mdp_super_t *refsb = page_address(refdev->sb_page);
1044 if (!uuid_equal(refsb, sb)) {
1045 printk(KERN_WARNING "md: %s has different UUID to %s\n",
1046 b, bdevname(refdev->bdev,b2));
1049 if (!sb_equal(refsb, sb)) {
1050 printk(KERN_WARNING "md: %s has same UUID"
1051 " but different superblock to %s\n",
1052 b, bdevname(refdev->bdev, b2));
1056 ev2 = md_event(refsb);
1062 rdev->sectors = rdev->sb_start;
1063 /* Limit to 4TB as metadata cannot record more than that.
1064 * (not needed for Linear and RAID0 as metadata doesn't
1067 if (rdev->sectors >= (2ULL << 32) && sb->level >= 1)
1068 rdev->sectors = (2ULL << 32) - 2;
1070 if (rdev->sectors < ((sector_t)sb->size) * 2 && sb->level >= 1)
1071 /* "this cannot possibly happen" ... */
1079 * validate_super for 0.90.0
1081 static int super_90_validate(struct mddev *mddev, struct md_rdev *rdev)
1084 mdp_super_t *sb = page_address(rdev->sb_page);
1085 __u64 ev1 = md_event(sb);
1087 rdev->raid_disk = -1;
1088 clear_bit(Faulty, &rdev->flags);
1089 clear_bit(In_sync, &rdev->flags);
1090 clear_bit(Bitmap_sync, &rdev->flags);
1091 clear_bit(WriteMostly, &rdev->flags);
1093 if (mddev->raid_disks == 0) {
1094 mddev->major_version = 0;
1095 mddev->minor_version = sb->minor_version;
1096 mddev->patch_version = sb->patch_version;
1097 mddev->external = 0;
1098 mddev->chunk_sectors = sb->chunk_size >> 9;
1099 mddev->ctime = sb->ctime;
1100 mddev->utime = sb->utime;
1101 mddev->level = sb->level;
1102 mddev->clevel[0] = 0;
1103 mddev->layout = sb->layout;
1104 mddev->raid_disks = sb->raid_disks;
1105 mddev->dev_sectors = ((sector_t)sb->size) * 2;
1106 mddev->events = ev1;
1107 mddev->bitmap_info.offset = 0;
1108 mddev->bitmap_info.space = 0;
1109 /* bitmap can use 60 K after the 4K superblocks */
1110 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
1111 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
1112 mddev->reshape_backwards = 0;
1114 if (mddev->minor_version >= 91) {
1115 mddev->reshape_position = sb->reshape_position;
1116 mddev->delta_disks = sb->delta_disks;
1117 mddev->new_level = sb->new_level;
1118 mddev->new_layout = sb->new_layout;
1119 mddev->new_chunk_sectors = sb->new_chunk >> 9;
1120 if (mddev->delta_disks < 0)
1121 mddev->reshape_backwards = 1;
1123 mddev->reshape_position = MaxSector;
1124 mddev->delta_disks = 0;
1125 mddev->new_level = mddev->level;
1126 mddev->new_layout = mddev->layout;
1127 mddev->new_chunk_sectors = mddev->chunk_sectors;
1130 if (sb->state & (1<<MD_SB_CLEAN))
1131 mddev->recovery_cp = MaxSector;
1133 if (sb->events_hi == sb->cp_events_hi &&
1134 sb->events_lo == sb->cp_events_lo) {
1135 mddev->recovery_cp = sb->recovery_cp;
1137 mddev->recovery_cp = 0;
1140 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
1141 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
1142 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
1143 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
1145 mddev->max_disks = MD_SB_DISKS;
1147 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
1148 mddev->bitmap_info.file == NULL) {
1149 mddev->bitmap_info.offset =
1150 mddev->bitmap_info.default_offset;
1151 mddev->bitmap_info.space =
1152 mddev->bitmap_info.default_space;
1155 } else if (mddev->pers == NULL) {
1156 /* Insist on good event counter while assembling, except
1157 * for spares (which don't need an event count) */
1159 if (sb->disks[rdev->desc_nr].state & (
1160 (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE)))
1161 if (ev1 < mddev->events)
1163 } else if (mddev->bitmap) {
1164 /* if adding to array with a bitmap, then we can accept an
1165 * older device ... but not too old.
1167 if (ev1 < mddev->bitmap->events_cleared)
1169 if (ev1 < mddev->events)
1170 set_bit(Bitmap_sync, &rdev->flags);
1172 if (ev1 < mddev->events)
1173 /* just a hot-add of a new device, leave raid_disk at -1 */
1177 if (mddev->level != LEVEL_MULTIPATH) {
1178 desc = sb->disks + rdev->desc_nr;
1180 if (desc->state & (1<<MD_DISK_FAULTY))
1181 set_bit(Faulty, &rdev->flags);
1182 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
1183 desc->raid_disk < mddev->raid_disks */) {
1184 set_bit(In_sync, &rdev->flags);
1185 rdev->raid_disk = desc->raid_disk;
1186 } else if (desc->state & (1<<MD_DISK_ACTIVE)) {
1187 /* active but not in sync implies recovery up to
1188 * reshape position. We don't know exactly where
1189 * that is, so set to zero for now */
1190 if (mddev->minor_version >= 91) {
1191 rdev->recovery_offset = 0;
1192 rdev->raid_disk = desc->raid_disk;
1195 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
1196 set_bit(WriteMostly, &rdev->flags);
1197 } else /* MULTIPATH are always insync */
1198 set_bit(In_sync, &rdev->flags);
1203 * sync_super for 0.90.0
1205 static void super_90_sync(struct mddev *mddev, struct md_rdev *rdev)
1208 struct md_rdev *rdev2;
1209 int next_spare = mddev->raid_disks;
1212 /* make rdev->sb match mddev data..
1215 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1216 * 3/ any empty disks < next_spare become removed
1218 * disks[0] gets initialised to REMOVED because
1219 * we cannot be sure from other fields if it has
1220 * been initialised or not.
1223 int active=0, working=0,failed=0,spare=0,nr_disks=0;
1225 rdev->sb_size = MD_SB_BYTES;
1227 sb = page_address(rdev->sb_page);
1229 memset(sb, 0, sizeof(*sb));
1231 sb->md_magic = MD_SB_MAGIC;
1232 sb->major_version = mddev->major_version;
1233 sb->patch_version = mddev->patch_version;
1234 sb->gvalid_words = 0; /* ignored */
1235 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
1236 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
1237 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
1238 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
1240 sb->ctime = mddev->ctime;
1241 sb->level = mddev->level;
1242 sb->size = mddev->dev_sectors / 2;
1243 sb->raid_disks = mddev->raid_disks;
1244 sb->md_minor = mddev->md_minor;
1245 sb->not_persistent = 0;
1246 sb->utime = mddev->utime;
1248 sb->events_hi = (mddev->events>>32);
1249 sb->events_lo = (u32)mddev->events;
1251 if (mddev->reshape_position == MaxSector)
1252 sb->minor_version = 90;
1254 sb->minor_version = 91;
1255 sb->reshape_position = mddev->reshape_position;
1256 sb->new_level = mddev->new_level;
1257 sb->delta_disks = mddev->delta_disks;
1258 sb->new_layout = mddev->new_layout;
1259 sb->new_chunk = mddev->new_chunk_sectors << 9;
1261 mddev->minor_version = sb->minor_version;
1264 sb->recovery_cp = mddev->recovery_cp;
1265 sb->cp_events_hi = (mddev->events>>32);
1266 sb->cp_events_lo = (u32)mddev->events;
1267 if (mddev->recovery_cp == MaxSector)
1268 sb->state = (1<< MD_SB_CLEAN);
1270 sb->recovery_cp = 0;
1272 sb->layout = mddev->layout;
1273 sb->chunk_size = mddev->chunk_sectors << 9;
1275 if (mddev->bitmap && mddev->bitmap_info.file == NULL)
1276 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
1278 sb->disks[0].state = (1<<MD_DISK_REMOVED);
1279 rdev_for_each(rdev2, mddev) {
1282 int is_active = test_bit(In_sync, &rdev2->flags);
1284 if (rdev2->raid_disk >= 0 &&
1285 sb->minor_version >= 91)
1286 /* we have nowhere to store the recovery_offset,
1287 * but if it is not below the reshape_position,
1288 * we can piggy-back on that.
1291 if (rdev2->raid_disk < 0 ||
1292 test_bit(Faulty, &rdev2->flags))
1295 desc_nr = rdev2->raid_disk;
1297 desc_nr = next_spare++;
1298 rdev2->desc_nr = desc_nr;
1299 d = &sb->disks[rdev2->desc_nr];
1301 d->number = rdev2->desc_nr;
1302 d->major = MAJOR(rdev2->bdev->bd_dev);
1303 d->minor = MINOR(rdev2->bdev->bd_dev);
1305 d->raid_disk = rdev2->raid_disk;
1307 d->raid_disk = rdev2->desc_nr; /* compatibility */
1308 if (test_bit(Faulty, &rdev2->flags))
1309 d->state = (1<<MD_DISK_FAULTY);
1310 else if (is_active) {
1311 d->state = (1<<MD_DISK_ACTIVE);
1312 if (test_bit(In_sync, &rdev2->flags))
1313 d->state |= (1<<MD_DISK_SYNC);
1321 if (test_bit(WriteMostly, &rdev2->flags))
1322 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1324 /* now set the "removed" and "faulty" bits on any missing devices */
1325 for (i=0 ; i < mddev->raid_disks ; i++) {
1326 mdp_disk_t *d = &sb->disks[i];
1327 if (d->state == 0 && d->number == 0) {
1330 d->state = (1<<MD_DISK_REMOVED);
1331 d->state |= (1<<MD_DISK_FAULTY);
1335 sb->nr_disks = nr_disks;
1336 sb->active_disks = active;
1337 sb->working_disks = working;
1338 sb->failed_disks = failed;
1339 sb->spare_disks = spare;
1341 sb->this_disk = sb->disks[rdev->desc_nr];
1342 sb->sb_csum = calc_sb_csum(sb);
1346 * rdev_size_change for 0.90.0
1348 static unsigned long long
1349 super_90_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
1351 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1352 return 0; /* component must fit device */
1353 if (rdev->mddev->bitmap_info.offset)
1354 return 0; /* can't move bitmap */
1355 rdev->sb_start = calc_dev_sboffset(rdev);
1356 if (!num_sectors || num_sectors > rdev->sb_start)
1357 num_sectors = rdev->sb_start;
1358 /* Limit to 4TB as metadata cannot record more than that.
1359 * 4TB == 2^32 KB, or 2*2^32 sectors.
1361 if (num_sectors >= (2ULL << 32) && rdev->mddev->level >= 1)
1362 num_sectors = (2ULL << 32) - 2;
1363 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1365 md_super_wait(rdev->mddev);
1370 super_90_allow_new_offset(struct md_rdev *rdev, unsigned long long new_offset)
1372 /* non-zero offset changes not possible with v0.90 */
1373 return new_offset == 0;
1377 * version 1 superblock
1380 static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb)
1384 unsigned long long newcsum;
1385 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1386 __le32 *isuper = (__le32*)sb;
1388 disk_csum = sb->sb_csum;
1391 for (; size >= 4; size -= 4)
1392 newcsum += le32_to_cpu(*isuper++);
1395 newcsum += le16_to_cpu(*(__le16*) isuper);
1397 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1398 sb->sb_csum = disk_csum;
1399 return cpu_to_le32(csum);
1402 static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors,
1404 static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
1406 struct mdp_superblock_1 *sb;
1410 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1414 * Calculate the position of the superblock in 512byte sectors.
1415 * It is always aligned to a 4K boundary and
1416 * depeding on minor_version, it can be:
1417 * 0: At least 8K, but less than 12K, from end of device
1418 * 1: At start of device
1419 * 2: 4K from start of device.
1421 switch(minor_version) {
1423 sb_start = i_size_read(rdev->bdev->bd_inode) >> 9;
1425 sb_start &= ~(sector_t)(4*2-1);
1436 rdev->sb_start = sb_start;
1438 /* superblock is rarely larger than 1K, but it can be larger,
1439 * and it is safe to read 4k, so we do that
1441 ret = read_disk_sb(rdev, 4096);
1442 if (ret) return ret;
1445 sb = page_address(rdev->sb_page);
1447 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1448 sb->major_version != cpu_to_le32(1) ||
1449 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1450 le64_to_cpu(sb->super_offset) != rdev->sb_start ||
1451 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1454 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1455 printk("md: invalid superblock checksum on %s\n",
1456 bdevname(rdev->bdev,b));
1459 if (le64_to_cpu(sb->data_size) < 10) {
1460 printk("md: data_size too small on %s\n",
1461 bdevname(rdev->bdev,b));
1466 memcmp(sb->pad3, sb->pad3+1, sizeof(sb->pad3) - sizeof(sb->pad3[1])))
1467 /* Some padding is non-zero, might be a new feature */
1470 rdev->preferred_minor = 0xffff;
1471 rdev->data_offset = le64_to_cpu(sb->data_offset);
1472 rdev->new_data_offset = rdev->data_offset;
1473 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE) &&
1474 (le32_to_cpu(sb->feature_map) & MD_FEATURE_NEW_OFFSET))
1475 rdev->new_data_offset += (s32)le32_to_cpu(sb->new_offset);
1476 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1478 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1479 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1480 if (rdev->sb_size & bmask)
1481 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1484 && rdev->data_offset < sb_start + (rdev->sb_size/512))
1487 && rdev->new_data_offset < sb_start + (rdev->sb_size/512))
1490 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1493 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1495 if (!rdev->bb_page) {
1496 rdev->bb_page = alloc_page(GFP_KERNEL);
1500 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BAD_BLOCKS) &&
1501 rdev->badblocks.count == 0) {
1502 /* need to load the bad block list.
1503 * Currently we limit it to one page.
1509 int sectors = le16_to_cpu(sb->bblog_size);
1510 if (sectors > (PAGE_SIZE / 512))
1512 offset = le32_to_cpu(sb->bblog_offset);
1515 bb_sector = (long long)offset;
1516 if (!sync_page_io(rdev, bb_sector, sectors << 9,
1517 rdev->bb_page, READ, true))
1519 bbp = (u64 *)page_address(rdev->bb_page);
1520 rdev->badblocks.shift = sb->bblog_shift;
1521 for (i = 0 ; i < (sectors << (9-3)) ; i++, bbp++) {
1522 u64 bb = le64_to_cpu(*bbp);
1523 int count = bb & (0x3ff);
1524 u64 sector = bb >> 10;
1525 sector <<= sb->bblog_shift;
1526 count <<= sb->bblog_shift;
1529 if (md_set_badblocks(&rdev->badblocks,
1530 sector, count, 1) == 0)
1533 } else if (sb->bblog_offset != 0)
1534 rdev->badblocks.shift = 0;
1540 struct mdp_superblock_1 *refsb = page_address(refdev->sb_page);
1542 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1543 sb->level != refsb->level ||
1544 sb->layout != refsb->layout ||
1545 sb->chunksize != refsb->chunksize) {
1546 printk(KERN_WARNING "md: %s has strangely different"
1547 " superblock to %s\n",
1548 bdevname(rdev->bdev,b),
1549 bdevname(refdev->bdev,b2));
1552 ev1 = le64_to_cpu(sb->events);
1553 ev2 = le64_to_cpu(refsb->events);
1560 if (minor_version) {
1561 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9);
1562 sectors -= rdev->data_offset;
1564 sectors = rdev->sb_start;
1565 if (sectors < le64_to_cpu(sb->data_size))
1567 rdev->sectors = le64_to_cpu(sb->data_size);
1571 static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev)
1573 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
1574 __u64 ev1 = le64_to_cpu(sb->events);
1576 rdev->raid_disk = -1;
1577 clear_bit(Faulty, &rdev->flags);
1578 clear_bit(In_sync, &rdev->flags);
1579 clear_bit(Bitmap_sync, &rdev->flags);
1580 clear_bit(WriteMostly, &rdev->flags);
1582 if (mddev->raid_disks == 0) {
1583 mddev->major_version = 1;
1584 mddev->patch_version = 0;
1585 mddev->external = 0;
1586 mddev->chunk_sectors = le32_to_cpu(sb->chunksize);
1587 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1588 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1589 mddev->level = le32_to_cpu(sb->level);
1590 mddev->clevel[0] = 0;
1591 mddev->layout = le32_to_cpu(sb->layout);
1592 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1593 mddev->dev_sectors = le64_to_cpu(sb->size);
1594 mddev->events = ev1;
1595 mddev->bitmap_info.offset = 0;
1596 mddev->bitmap_info.space = 0;
1597 /* Default location for bitmap is 1K after superblock
1598 * using 3K - total of 4K
1600 mddev->bitmap_info.default_offset = 1024 >> 9;
1601 mddev->bitmap_info.default_space = (4096-1024) >> 9;
1602 mddev->reshape_backwards = 0;
1604 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1605 memcpy(mddev->uuid, sb->set_uuid, 16);
1607 mddev->max_disks = (4096-256)/2;
1609 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1610 mddev->bitmap_info.file == NULL) {
1611 mddev->bitmap_info.offset =
1612 (__s32)le32_to_cpu(sb->bitmap_offset);
1613 /* Metadata doesn't record how much space is available.
1614 * For 1.0, we assume we can use up to the superblock
1615 * if before, else to 4K beyond superblock.
1616 * For others, assume no change is possible.
1618 if (mddev->minor_version > 0)
1619 mddev->bitmap_info.space = 0;
1620 else if (mddev->bitmap_info.offset > 0)
1621 mddev->bitmap_info.space =
1622 8 - mddev->bitmap_info.offset;
1624 mddev->bitmap_info.space =
1625 -mddev->bitmap_info.offset;
1628 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1629 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1630 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1631 mddev->new_level = le32_to_cpu(sb->new_level);
1632 mddev->new_layout = le32_to_cpu(sb->new_layout);
1633 mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk);
1634 if (mddev->delta_disks < 0 ||
1635 (mddev->delta_disks == 0 &&
1636 (le32_to_cpu(sb->feature_map)
1637 & MD_FEATURE_RESHAPE_BACKWARDS)))
1638 mddev->reshape_backwards = 1;
1640 mddev->reshape_position = MaxSector;
1641 mddev->delta_disks = 0;
1642 mddev->new_level = mddev->level;
1643 mddev->new_layout = mddev->layout;
1644 mddev->new_chunk_sectors = mddev->chunk_sectors;
1647 } else if (mddev->pers == NULL) {
1648 /* Insist of good event counter while assembling, except for
1649 * spares (which don't need an event count) */
1651 if (rdev->desc_nr >= 0 &&
1652 rdev->desc_nr < le32_to_cpu(sb->max_dev) &&
1653 le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < 0xfffe)
1654 if (ev1 < mddev->events)
1656 } else if (mddev->bitmap) {
1657 /* If adding to array with a bitmap, then we can accept an
1658 * older device, but not too old.
1660 if (ev1 < mddev->bitmap->events_cleared)
1662 if (ev1 < mddev->events)
1663 set_bit(Bitmap_sync, &rdev->flags);
1665 if (ev1 < mddev->events)
1666 /* just a hot-add of a new device, leave raid_disk at -1 */
1669 if (mddev->level != LEVEL_MULTIPATH) {
1671 if (rdev->desc_nr < 0 ||
1672 rdev->desc_nr >= le32_to_cpu(sb->max_dev)) {
1676 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1678 case 0xffff: /* spare */
1680 case 0xfffe: /* faulty */
1681 set_bit(Faulty, &rdev->flags);
1684 if ((le32_to_cpu(sb->feature_map) &
1685 MD_FEATURE_RECOVERY_OFFSET))
1686 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1688 set_bit(In_sync, &rdev->flags);
1689 rdev->raid_disk = role;
1692 if (sb->devflags & WriteMostly1)
1693 set_bit(WriteMostly, &rdev->flags);
1694 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_REPLACEMENT)
1695 set_bit(Replacement, &rdev->flags);
1696 } else /* MULTIPATH are always insync */
1697 set_bit(In_sync, &rdev->flags);
1702 static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev)
1704 struct mdp_superblock_1 *sb;
1705 struct md_rdev *rdev2;
1707 /* make rdev->sb match mddev and rdev data. */
1709 sb = page_address(rdev->sb_page);
1711 sb->feature_map = 0;
1713 sb->recovery_offset = cpu_to_le64(0);
1714 memset(sb->pad3, 0, sizeof(sb->pad3));
1716 sb->utime = cpu_to_le64((__u64)mddev->utime);
1717 sb->events = cpu_to_le64(mddev->events);
1719 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1721 sb->resync_offset = cpu_to_le64(0);
1723 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
1725 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
1726 sb->size = cpu_to_le64(mddev->dev_sectors);
1727 sb->chunksize = cpu_to_le32(mddev->chunk_sectors);
1728 sb->level = cpu_to_le32(mddev->level);
1729 sb->layout = cpu_to_le32(mddev->layout);
1731 if (test_bit(WriteMostly, &rdev->flags))
1732 sb->devflags |= WriteMostly1;
1734 sb->devflags &= ~WriteMostly1;
1735 sb->data_offset = cpu_to_le64(rdev->data_offset);
1736 sb->data_size = cpu_to_le64(rdev->sectors);
1738 if (mddev->bitmap && mddev->bitmap_info.file == NULL) {
1739 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset);
1740 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
1743 if (rdev->raid_disk >= 0 &&
1744 !test_bit(In_sync, &rdev->flags)) {
1746 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1747 sb->recovery_offset =
1748 cpu_to_le64(rdev->recovery_offset);
1750 if (test_bit(Replacement, &rdev->flags))
1752 cpu_to_le32(MD_FEATURE_REPLACEMENT);
1754 if (mddev->reshape_position != MaxSector) {
1755 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1756 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1757 sb->new_layout = cpu_to_le32(mddev->new_layout);
1758 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1759 sb->new_level = cpu_to_le32(mddev->new_level);
1760 sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors);
1761 if (mddev->delta_disks == 0 &&
1762 mddev->reshape_backwards)
1764 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS);
1765 if (rdev->new_data_offset != rdev->data_offset) {
1767 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET);
1768 sb->new_offset = cpu_to_le32((__u32)(rdev->new_data_offset
1769 - rdev->data_offset));
1773 if (rdev->badblocks.count == 0)
1774 /* Nothing to do for bad blocks*/ ;
1775 else if (sb->bblog_offset == 0)
1776 /* Cannot record bad blocks on this device */
1777 md_error(mddev, rdev);
1779 struct badblocks *bb = &rdev->badblocks;
1780 u64 *bbp = (u64 *)page_address(rdev->bb_page);
1782 sb->feature_map |= cpu_to_le32(MD_FEATURE_BAD_BLOCKS);
1787 seq = read_seqbegin(&bb->lock);
1789 memset(bbp, 0xff, PAGE_SIZE);
1791 for (i = 0 ; i < bb->count ; i++) {
1792 u64 internal_bb = p[i];
1793 u64 store_bb = ((BB_OFFSET(internal_bb) << 10)
1794 | BB_LEN(internal_bb));
1795 bbp[i] = cpu_to_le64(store_bb);
1798 if (read_seqretry(&bb->lock, seq))
1801 bb->sector = (rdev->sb_start +
1802 (int)le32_to_cpu(sb->bblog_offset));
1803 bb->size = le16_to_cpu(sb->bblog_size);
1808 rdev_for_each(rdev2, mddev)
1809 if (rdev2->desc_nr+1 > max_dev)
1810 max_dev = rdev2->desc_nr+1;
1812 if (max_dev > le32_to_cpu(sb->max_dev)) {
1814 sb->max_dev = cpu_to_le32(max_dev);
1815 rdev->sb_size = max_dev * 2 + 256;
1816 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1817 if (rdev->sb_size & bmask)
1818 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1820 max_dev = le32_to_cpu(sb->max_dev);
1822 for (i=0; i<max_dev;i++)
1823 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1825 rdev_for_each(rdev2, mddev) {
1827 if (test_bit(Faulty, &rdev2->flags))
1828 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1829 else if (test_bit(In_sync, &rdev2->flags))
1830 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1831 else if (rdev2->raid_disk >= 0)
1832 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1834 sb->dev_roles[i] = cpu_to_le16(0xffff);
1837 sb->sb_csum = calc_sb_1_csum(sb);
1840 static unsigned long long
1841 super_1_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
1843 struct mdp_superblock_1 *sb;
1844 sector_t max_sectors;
1845 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1846 return 0; /* component must fit device */
1847 if (rdev->data_offset != rdev->new_data_offset)
1848 return 0; /* too confusing */
1849 if (rdev->sb_start < rdev->data_offset) {
1850 /* minor versions 1 and 2; superblock before data */
1851 max_sectors = i_size_read(rdev->bdev->bd_inode) >> 9;
1852 max_sectors -= rdev->data_offset;
1853 if (!num_sectors || num_sectors > max_sectors)
1854 num_sectors = max_sectors;
1855 } else if (rdev->mddev->bitmap_info.offset) {
1856 /* minor version 0 with bitmap we can't move */
1859 /* minor version 0; superblock after data */
1861 sb_start = (i_size_read(rdev->bdev->bd_inode) >> 9) - 8*2;
1862 sb_start &= ~(sector_t)(4*2 - 1);
1863 max_sectors = rdev->sectors + sb_start - rdev->sb_start;
1864 if (!num_sectors || num_sectors > max_sectors)
1865 num_sectors = max_sectors;
1866 rdev->sb_start = sb_start;
1868 sb = page_address(rdev->sb_page);
1869 sb->data_size = cpu_to_le64(num_sectors);
1870 sb->super_offset = rdev->sb_start;
1871 sb->sb_csum = calc_sb_1_csum(sb);
1872 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1874 md_super_wait(rdev->mddev);
1880 super_1_allow_new_offset(struct md_rdev *rdev,
1881 unsigned long long new_offset)
1883 /* All necessary checks on new >= old have been done */
1884 struct bitmap *bitmap;
1885 if (new_offset >= rdev->data_offset)
1888 /* with 1.0 metadata, there is no metadata to tread on
1889 * so we can always move back */
1890 if (rdev->mddev->minor_version == 0)
1893 /* otherwise we must be sure not to step on
1894 * any metadata, so stay:
1895 * 36K beyond start of superblock
1896 * beyond end of badblocks
1897 * beyond write-intent bitmap
1899 if (rdev->sb_start + (32+4)*2 > new_offset)
1901 bitmap = rdev->mddev->bitmap;
1902 if (bitmap && !rdev->mddev->bitmap_info.file &&
1903 rdev->sb_start + rdev->mddev->bitmap_info.offset +
1904 bitmap->storage.file_pages * (PAGE_SIZE>>9) > new_offset)
1906 if (rdev->badblocks.sector + rdev->badblocks.size > new_offset)
1912 static struct super_type super_types[] = {
1915 .owner = THIS_MODULE,
1916 .load_super = super_90_load,
1917 .validate_super = super_90_validate,
1918 .sync_super = super_90_sync,
1919 .rdev_size_change = super_90_rdev_size_change,
1920 .allow_new_offset = super_90_allow_new_offset,
1924 .owner = THIS_MODULE,
1925 .load_super = super_1_load,
1926 .validate_super = super_1_validate,
1927 .sync_super = super_1_sync,
1928 .rdev_size_change = super_1_rdev_size_change,
1929 .allow_new_offset = super_1_allow_new_offset,
1933 static void sync_super(struct mddev *mddev, struct md_rdev *rdev)
1935 if (mddev->sync_super) {
1936 mddev->sync_super(mddev, rdev);
1940 BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types));
1942 super_types[mddev->major_version].sync_super(mddev, rdev);
1945 static int match_mddev_units(struct mddev *mddev1, struct mddev *mddev2)
1947 struct md_rdev *rdev, *rdev2;
1950 rdev_for_each_rcu(rdev, mddev1)
1951 rdev_for_each_rcu(rdev2, mddev2)
1952 if (rdev->bdev->bd_contains ==
1953 rdev2->bdev->bd_contains) {
1961 static LIST_HEAD(pending_raid_disks);
1964 * Try to register data integrity profile for an mddev
1966 * This is called when an array is started and after a disk has been kicked
1967 * from the array. It only succeeds if all working and active component devices
1968 * are integrity capable with matching profiles.
1970 int md_integrity_register(struct mddev *mddev)
1972 struct md_rdev *rdev, *reference = NULL;
1974 if (list_empty(&mddev->disks))
1975 return 0; /* nothing to do */
1976 if (!mddev->gendisk || blk_get_integrity(mddev->gendisk))
1977 return 0; /* shouldn't register, or already is */
1978 rdev_for_each(rdev, mddev) {
1979 /* skip spares and non-functional disks */
1980 if (test_bit(Faulty, &rdev->flags))
1982 if (rdev->raid_disk < 0)
1985 /* Use the first rdev as the reference */
1989 /* does this rdev's profile match the reference profile? */
1990 if (blk_integrity_compare(reference->bdev->bd_disk,
1991 rdev->bdev->bd_disk) < 0)
1994 if (!reference || !bdev_get_integrity(reference->bdev))
1997 * All component devices are integrity capable and have matching
1998 * profiles, register the common profile for the md device.
2000 if (blk_integrity_register(mddev->gendisk,
2001 bdev_get_integrity(reference->bdev)) != 0) {
2002 printk(KERN_ERR "md: failed to register integrity for %s\n",
2006 printk(KERN_NOTICE "md: data integrity enabled on %s\n", mdname(mddev));
2007 if (bioset_integrity_create(mddev->bio_set, BIO_POOL_SIZE)) {
2008 printk(KERN_ERR "md: failed to create integrity pool for %s\n",
2014 EXPORT_SYMBOL(md_integrity_register);
2016 /* Disable data integrity if non-capable/non-matching disk is being added */
2017 void md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev)
2019 struct blk_integrity *bi_rdev;
2020 struct blk_integrity *bi_mddev;
2022 if (!mddev->gendisk)
2025 bi_rdev = bdev_get_integrity(rdev->bdev);
2026 bi_mddev = blk_get_integrity(mddev->gendisk);
2028 if (!bi_mddev) /* nothing to do */
2030 if (rdev->raid_disk < 0) /* skip spares */
2032 if (bi_rdev && blk_integrity_compare(mddev->gendisk,
2033 rdev->bdev->bd_disk) >= 0)
2035 printk(KERN_NOTICE "disabling data integrity on %s\n", mdname(mddev));
2036 blk_integrity_unregister(mddev->gendisk);
2038 EXPORT_SYMBOL(md_integrity_add_rdev);
2040 static int bind_rdev_to_array(struct md_rdev * rdev, struct mddev * mddev)
2042 char b[BDEVNAME_SIZE];
2052 /* prevent duplicates */
2053 if (find_rdev(mddev, rdev->bdev->bd_dev))
2056 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2057 if (rdev->sectors && (mddev->dev_sectors == 0 ||
2058 rdev->sectors < mddev->dev_sectors)) {
2060 /* Cannot change size, so fail
2061 * If mddev->level <= 0, then we don't care
2062 * about aligning sizes (e.g. linear)
2064 if (mddev->level > 0)
2067 mddev->dev_sectors = rdev->sectors;
2070 /* Verify rdev->desc_nr is unique.
2071 * If it is -1, assign a free number, else
2072 * check number is not in use
2074 if (rdev->desc_nr < 0) {
2076 if (mddev->pers) choice = mddev->raid_disks;
2077 while (find_rdev_nr(mddev, choice))
2079 rdev->desc_nr = choice;
2081 if (find_rdev_nr(mddev, rdev->desc_nr))
2084 if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) {
2085 printk(KERN_WARNING "md: %s: array is limited to %d devices\n",
2086 mdname(mddev), mddev->max_disks);
2089 bdevname(rdev->bdev,b);
2090 while ( (s=strchr(b, '/')) != NULL)
2093 rdev->mddev = mddev;
2094 printk(KERN_INFO "md: bind<%s>\n", b);
2096 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
2099 ko = &part_to_dev(rdev->bdev->bd_part)->kobj;
2100 if (sysfs_create_link(&rdev->kobj, ko, "block"))
2101 /* failure here is OK */;
2102 rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state");
2104 list_add_rcu(&rdev->same_set, &mddev->disks);
2105 bd_link_disk_holder(rdev->bdev, mddev->gendisk);
2107 /* May as well allow recovery to be retried once */
2108 mddev->recovery_disabled++;
2113 printk(KERN_WARNING "md: failed to register dev-%s for %s\n",
2118 static void md_delayed_delete(struct work_struct *ws)
2120 struct md_rdev *rdev = container_of(ws, struct md_rdev, del_work);
2121 kobject_del(&rdev->kobj);
2122 kobject_put(&rdev->kobj);
2125 static void unbind_rdev_from_array(struct md_rdev * rdev)
2127 char b[BDEVNAME_SIZE];
2132 bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk);
2133 list_del_rcu(&rdev->same_set);
2134 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
2136 sysfs_remove_link(&rdev->kobj, "block");
2137 sysfs_put(rdev->sysfs_state);
2138 rdev->sysfs_state = NULL;
2139 rdev->badblocks.count = 0;
2140 /* We need to delay this, otherwise we can deadlock when
2141 * writing to 'remove' to "dev/state". We also need
2142 * to delay it due to rcu usage.
2145 INIT_WORK(&rdev->del_work, md_delayed_delete);
2146 kobject_get(&rdev->kobj);
2147 queue_work(md_misc_wq, &rdev->del_work);
2151 * prevent the device from being mounted, repartitioned or
2152 * otherwise reused by a RAID array (or any other kernel
2153 * subsystem), by bd_claiming the device.
2155 static int lock_rdev(struct md_rdev *rdev, dev_t dev, int shared)
2158 struct block_device *bdev;
2159 char b[BDEVNAME_SIZE];
2161 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
2162 shared ? (struct md_rdev *)lock_rdev : rdev);
2164 printk(KERN_ERR "md: could not open %s.\n",
2165 __bdevname(dev, b));
2166 return PTR_ERR(bdev);
2172 static void unlock_rdev(struct md_rdev *rdev)
2174 struct block_device *bdev = rdev->bdev;
2178 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
2181 void md_autodetect_dev(dev_t dev);
2183 static void export_rdev(struct md_rdev * rdev)
2185 char b[BDEVNAME_SIZE];
2186 printk(KERN_INFO "md: export_rdev(%s)\n",
2187 bdevname(rdev->bdev,b));
2190 md_rdev_clear(rdev);
2192 if (test_bit(AutoDetected, &rdev->flags))
2193 md_autodetect_dev(rdev->bdev->bd_dev);
2196 kobject_put(&rdev->kobj);
2199 static void kick_rdev_from_array(struct md_rdev * rdev)
2201 unbind_rdev_from_array(rdev);
2205 static void export_array(struct mddev *mddev)
2207 struct md_rdev *rdev, *tmp;
2209 rdev_for_each_safe(rdev, tmp, mddev) {
2214 kick_rdev_from_array(rdev);
2216 if (!list_empty(&mddev->disks))
2218 mddev->raid_disks = 0;
2219 mddev->major_version = 0;
2222 static void print_desc(mdp_disk_t *desc)
2224 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
2225 desc->major,desc->minor,desc->raid_disk,desc->state);
2228 static void print_sb_90(mdp_super_t *sb)
2233 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
2234 sb->major_version, sb->minor_version, sb->patch_version,
2235 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
2237 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
2238 sb->level, sb->size, sb->nr_disks, sb->raid_disks,
2239 sb->md_minor, sb->layout, sb->chunk_size);
2240 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
2241 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
2242 sb->utime, sb->state, sb->active_disks, sb->working_disks,
2243 sb->failed_disks, sb->spare_disks,
2244 sb->sb_csum, (unsigned long)sb->events_lo);
2247 for (i = 0; i < MD_SB_DISKS; i++) {
2250 desc = sb->disks + i;
2251 if (desc->number || desc->major || desc->minor ||
2252 desc->raid_disk || (desc->state && (desc->state != 4))) {
2253 printk(" D %2d: ", i);
2257 printk(KERN_INFO "md: THIS: ");
2258 print_desc(&sb->this_disk);
2261 static void print_sb_1(struct mdp_superblock_1 *sb)
2265 uuid = sb->set_uuid;
2267 "md: SB: (V:%u) (F:0x%08x) Array-ID:<%pU>\n"
2268 "md: Name: \"%s\" CT:%llu\n",
2269 le32_to_cpu(sb->major_version),
2270 le32_to_cpu(sb->feature_map),
2273 (unsigned long long)le64_to_cpu(sb->ctime)
2274 & MD_SUPERBLOCK_1_TIME_SEC_MASK);
2276 uuid = sb->device_uuid;
2278 "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu"
2280 "md: Dev:%08x UUID: %pU\n"
2281 "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n"
2282 "md: (MaxDev:%u) \n",
2283 le32_to_cpu(sb->level),
2284 (unsigned long long)le64_to_cpu(sb->size),
2285 le32_to_cpu(sb->raid_disks),
2286 le32_to_cpu(sb->layout),
2287 le32_to_cpu(sb->chunksize),
2288 (unsigned long long)le64_to_cpu(sb->data_offset),
2289 (unsigned long long)le64_to_cpu(sb->data_size),
2290 (unsigned long long)le64_to_cpu(sb->super_offset),
2291 (unsigned long long)le64_to_cpu(sb->recovery_offset),
2292 le32_to_cpu(sb->dev_number),
2295 (unsigned long long)le64_to_cpu(sb->utime) & MD_SUPERBLOCK_1_TIME_SEC_MASK,
2296 (unsigned long long)le64_to_cpu(sb->events),
2297 (unsigned long long)le64_to_cpu(sb->resync_offset),
2298 le32_to_cpu(sb->sb_csum),
2299 le32_to_cpu(sb->max_dev)
2303 static void print_rdev(struct md_rdev *rdev, int major_version)
2305 char b[BDEVNAME_SIZE];
2306 printk(KERN_INFO "md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n",
2307 bdevname(rdev->bdev, b), (unsigned long long)rdev->sectors,
2308 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
2310 if (rdev->sb_loaded) {
2311 printk(KERN_INFO "md: rdev superblock (MJ:%d):\n", major_version);
2312 switch (major_version) {
2314 print_sb_90(page_address(rdev->sb_page));
2317 print_sb_1(page_address(rdev->sb_page));
2321 printk(KERN_INFO "md: no rdev superblock!\n");
2324 static void md_print_devices(void)
2326 struct list_head *tmp;
2327 struct md_rdev *rdev;
2328 struct mddev *mddev;
2329 char b[BDEVNAME_SIZE];
2332 printk("md: **********************************\n");
2333 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
2334 printk("md: **********************************\n");
2335 for_each_mddev(mddev, tmp) {
2338 bitmap_print_sb(mddev->bitmap);
2340 printk("%s: ", mdname(mddev));
2341 rdev_for_each(rdev, mddev)
2342 printk("<%s>", bdevname(rdev->bdev,b));
2345 rdev_for_each(rdev, mddev)
2346 print_rdev(rdev, mddev->major_version);
2348 printk("md: **********************************\n");
2353 static void sync_sbs(struct mddev * mddev, int nospares)
2355 /* Update each superblock (in-memory image), but
2356 * if we are allowed to, skip spares which already
2357 * have the right event counter, or have one earlier
2358 * (which would mean they aren't being marked as dirty
2359 * with the rest of the array)
2361 struct md_rdev *rdev;
2362 rdev_for_each(rdev, mddev) {
2363 if (rdev->sb_events == mddev->events ||
2365 rdev->raid_disk < 0 &&
2366 rdev->sb_events+1 == mddev->events)) {
2367 /* Don't update this superblock */
2368 rdev->sb_loaded = 2;
2370 sync_super(mddev, rdev);
2371 rdev->sb_loaded = 1;
2376 static void md_update_sb(struct mddev * mddev, int force_change)
2378 struct md_rdev *rdev;
2381 int any_badblocks_changed = 0;
2385 set_bit(MD_CHANGE_DEVS, &mddev->flags);
2389 /* First make sure individual recovery_offsets are correct */
2390 rdev_for_each(rdev, mddev) {
2391 if (rdev->raid_disk >= 0 &&
2392 mddev->delta_disks >= 0 &&
2393 !test_bit(In_sync, &rdev->flags) &&
2394 mddev->curr_resync_completed > rdev->recovery_offset)
2395 rdev->recovery_offset = mddev->curr_resync_completed;
2398 if (!mddev->persistent) {
2399 clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
2400 clear_bit(MD_CHANGE_DEVS, &mddev->flags);
2401 if (!mddev->external) {
2402 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2403 rdev_for_each(rdev, mddev) {
2404 if (rdev->badblocks.changed) {
2405 rdev->badblocks.changed = 0;
2406 md_ack_all_badblocks(&rdev->badblocks);
2407 md_error(mddev, rdev);
2409 clear_bit(Blocked, &rdev->flags);
2410 clear_bit(BlockedBadBlocks, &rdev->flags);
2411 wake_up(&rdev->blocked_wait);
2414 wake_up(&mddev->sb_wait);
2418 spin_lock_irq(&mddev->write_lock);
2420 mddev->utime = get_seconds();
2422 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
2424 if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags))
2425 /* just a clean<-> dirty transition, possibly leave spares alone,
2426 * though if events isn't the right even/odd, we will have to do
2432 if (mddev->degraded)
2433 /* If the array is degraded, then skipping spares is both
2434 * dangerous and fairly pointless.
2435 * Dangerous because a device that was removed from the array
2436 * might have a event_count that still looks up-to-date,
2437 * so it can be re-added without a resync.
2438 * Pointless because if there are any spares to skip,
2439 * then a recovery will happen and soon that array won't
2440 * be degraded any more and the spare can go back to sleep then.
2444 sync_req = mddev->in_sync;
2446 /* If this is just a dirty<->clean transition, and the array is clean
2447 * and 'events' is odd, we can roll back to the previous clean state */
2449 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
2450 && mddev->can_decrease_events
2451 && mddev->events != 1) {
2453 mddev->can_decrease_events = 0;
2455 /* otherwise we have to go forward and ... */
2457 mddev->can_decrease_events = nospares;
2460 if (!mddev->events) {
2462 * oops, this 64-bit counter should never wrap.
2463 * Either we are in around ~1 trillion A.C., assuming
2464 * 1 reboot per second, or we have a bug:
2470 rdev_for_each(rdev, mddev) {
2471 if (rdev->badblocks.changed)
2472 any_badblocks_changed++;
2473 if (test_bit(Faulty, &rdev->flags))
2474 set_bit(FaultRecorded, &rdev->flags);
2477 sync_sbs(mddev, nospares);
2478 spin_unlock_irq(&mddev->write_lock);
2480 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2481 mdname(mddev), mddev->in_sync);
2483 bitmap_update_sb(mddev->bitmap);
2484 rdev_for_each(rdev, mddev) {
2485 char b[BDEVNAME_SIZE];
2487 if (rdev->sb_loaded != 1)
2488 continue; /* no noise on spare devices */
2490 if (!test_bit(Faulty, &rdev->flags) &&
2491 rdev->saved_raid_disk == -1) {
2492 md_super_write(mddev,rdev,
2493 rdev->sb_start, rdev->sb_size,
2495 pr_debug("md: (write) %s's sb offset: %llu\n",
2496 bdevname(rdev->bdev, b),
2497 (unsigned long long)rdev->sb_start);
2498 rdev->sb_events = mddev->events;
2499 if (rdev->badblocks.size) {
2500 md_super_write(mddev, rdev,
2501 rdev->badblocks.sector,
2502 rdev->badblocks.size << 9,
2504 rdev->badblocks.size = 0;
2507 } else if (test_bit(Faulty, &rdev->flags))
2508 pr_debug("md: %s (skipping faulty)\n",
2509 bdevname(rdev->bdev, b));
2511 pr_debug("(skipping incremental s/r ");
2513 if (mddev->level == LEVEL_MULTIPATH)
2514 /* only need to write one superblock... */
2517 md_super_wait(mddev);
2518 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2520 spin_lock_irq(&mddev->write_lock);
2521 if (mddev->in_sync != sync_req ||
2522 test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
2523 /* have to write it out again */
2524 spin_unlock_irq(&mddev->write_lock);
2527 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2528 spin_unlock_irq(&mddev->write_lock);
2529 wake_up(&mddev->sb_wait);
2530 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
2531 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
2533 rdev_for_each(rdev, mddev) {
2534 if (test_and_clear_bit(FaultRecorded, &rdev->flags))
2535 clear_bit(Blocked, &rdev->flags);
2537 if (any_badblocks_changed)
2538 md_ack_all_badblocks(&rdev->badblocks);
2539 clear_bit(BlockedBadBlocks, &rdev->flags);
2540 wake_up(&rdev->blocked_wait);
2544 /* words written to sysfs files may, or may not, be \n terminated.
2545 * We want to accept with case. For this we use cmd_match.
2547 static int cmd_match(const char *cmd, const char *str)
2549 /* See if cmd, written into a sysfs file, matches
2550 * str. They must either be the same, or cmd can
2551 * have a trailing newline
2553 while (*cmd && *str && *cmd == *str) {
2564 struct rdev_sysfs_entry {
2565 struct attribute attr;
2566 ssize_t (*show)(struct md_rdev *, char *);
2567 ssize_t (*store)(struct md_rdev *, const char *, size_t);
2571 state_show(struct md_rdev *rdev, char *page)
2576 if (test_bit(Faulty, &rdev->flags) ||
2577 rdev->badblocks.unacked_exist) {
2578 len+= sprintf(page+len, "%sfaulty",sep);
2581 if (test_bit(In_sync, &rdev->flags)) {
2582 len += sprintf(page+len, "%sin_sync",sep);
2585 if (test_bit(WriteMostly, &rdev->flags)) {
2586 len += sprintf(page+len, "%swrite_mostly",sep);
2589 if (test_bit(Blocked, &rdev->flags) ||
2590 (rdev->badblocks.unacked_exist
2591 && !test_bit(Faulty, &rdev->flags))) {
2592 len += sprintf(page+len, "%sblocked", sep);
2595 if (!test_bit(Faulty, &rdev->flags) &&
2596 !test_bit(In_sync, &rdev->flags)) {
2597 len += sprintf(page+len, "%sspare", sep);
2600 if (test_bit(WriteErrorSeen, &rdev->flags)) {
2601 len += sprintf(page+len, "%swrite_error", sep);
2604 if (test_bit(WantReplacement, &rdev->flags)) {
2605 len += sprintf(page+len, "%swant_replacement", sep);
2608 if (test_bit(Replacement, &rdev->flags)) {
2609 len += sprintf(page+len, "%sreplacement", sep);
2613 return len+sprintf(page+len, "\n");
2617 state_store(struct md_rdev *rdev, const char *buf, size_t len)
2620 * faulty - simulates an error
2621 * remove - disconnects the device
2622 * writemostly - sets write_mostly
2623 * -writemostly - clears write_mostly
2624 * blocked - sets the Blocked flags
2625 * -blocked - clears the Blocked and possibly simulates an error
2626 * insync - sets Insync providing device isn't active
2627 * write_error - sets WriteErrorSeen
2628 * -write_error - clears WriteErrorSeen
2631 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
2632 md_error(rdev->mddev, rdev);
2633 if (test_bit(Faulty, &rdev->flags))
2637 } else if (cmd_match(buf, "remove")) {
2638 if (rdev->raid_disk >= 0)
2641 struct mddev *mddev = rdev->mddev;
2642 kick_rdev_from_array(rdev);
2644 md_update_sb(mddev, 1);
2645 md_new_event(mddev);
2648 } else if (cmd_match(buf, "writemostly")) {
2649 set_bit(WriteMostly, &rdev->flags);
2651 } else if (cmd_match(buf, "-writemostly")) {
2652 clear_bit(WriteMostly, &rdev->flags);
2654 } else if (cmd_match(buf, "blocked")) {
2655 set_bit(Blocked, &rdev->flags);
2657 } else if (cmd_match(buf, "-blocked")) {
2658 if (!test_bit(Faulty, &rdev->flags) &&
2659 rdev->badblocks.unacked_exist) {
2660 /* metadata handler doesn't understand badblocks,
2661 * so we need to fail the device
2663 md_error(rdev->mddev, rdev);
2665 clear_bit(Blocked, &rdev->flags);
2666 clear_bit(BlockedBadBlocks, &rdev->flags);
2667 wake_up(&rdev->blocked_wait);
2668 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2669 md_wakeup_thread(rdev->mddev->thread);
2672 } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) {
2673 set_bit(In_sync, &rdev->flags);
2675 } else if (cmd_match(buf, "write_error")) {
2676 set_bit(WriteErrorSeen, &rdev->flags);
2678 } else if (cmd_match(buf, "-write_error")) {
2679 clear_bit(WriteErrorSeen, &rdev->flags);
2681 } else if (cmd_match(buf, "want_replacement")) {
2682 /* Any non-spare device that is not a replacement can
2683 * become want_replacement at any time, but we then need to
2684 * check if recovery is needed.
2686 if (rdev->raid_disk >= 0 &&
2687 !test_bit(Replacement, &rdev->flags))
2688 set_bit(WantReplacement, &rdev->flags);
2689 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2690 md_wakeup_thread(rdev->mddev->thread);
2692 } else if (cmd_match(buf, "-want_replacement")) {
2693 /* Clearing 'want_replacement' is always allowed.
2694 * Once replacements starts it is too late though.
2697 clear_bit(WantReplacement, &rdev->flags);
2698 } else if (cmd_match(buf, "replacement")) {
2699 /* Can only set a device as a replacement when array has not
2700 * yet been started. Once running, replacement is automatic
2701 * from spares, or by assigning 'slot'.
2703 if (rdev->mddev->pers)
2706 set_bit(Replacement, &rdev->flags);
2709 } else if (cmd_match(buf, "-replacement")) {
2710 /* Similarly, can only clear Replacement before start */
2711 if (rdev->mddev->pers)
2714 clear_bit(Replacement, &rdev->flags);
2719 sysfs_notify_dirent_safe(rdev->sysfs_state);
2720 return err ? err : len;
2722 static struct rdev_sysfs_entry rdev_state =
2723 __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store);
2726 errors_show(struct md_rdev *rdev, char *page)
2728 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
2732 errors_store(struct md_rdev *rdev, const char *buf, size_t len)
2735 unsigned long n = simple_strtoul(buf, &e, 10);
2736 if (*buf && (*e == 0 || *e == '\n')) {
2737 atomic_set(&rdev->corrected_errors, n);
2742 static struct rdev_sysfs_entry rdev_errors =
2743 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
2746 slot_show(struct md_rdev *rdev, char *page)
2748 if (rdev->raid_disk < 0)
2749 return sprintf(page, "none\n");
2751 return sprintf(page, "%d\n", rdev->raid_disk);
2755 slot_store(struct md_rdev *rdev, const char *buf, size_t len)
2759 int slot = simple_strtoul(buf, &e, 10);
2760 if (strncmp(buf, "none", 4)==0)
2762 else if (e==buf || (*e && *e!= '\n'))
2764 if (rdev->mddev->pers && slot == -1) {
2765 /* Setting 'slot' on an active array requires also
2766 * updating the 'rd%d' link, and communicating
2767 * with the personality with ->hot_*_disk.
2768 * For now we only support removing
2769 * failed/spare devices. This normally happens automatically,
2770 * but not when the metadata is externally managed.
2772 if (rdev->raid_disk == -1)
2774 /* personality does all needed checks */
2775 if (rdev->mddev->pers->hot_remove_disk == NULL)
2777 clear_bit(Blocked, &rdev->flags);
2778 remove_and_add_spares(rdev->mddev, rdev);
2779 if (rdev->raid_disk >= 0)
2781 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2782 md_wakeup_thread(rdev->mddev->thread);
2783 } else if (rdev->mddev->pers) {
2784 /* Activating a spare .. or possibly reactivating
2785 * if we ever get bitmaps working here.
2788 if (rdev->raid_disk != -1)
2791 if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery))
2794 if (rdev->mddev->pers->hot_add_disk == NULL)
2797 if (slot >= rdev->mddev->raid_disks &&
2798 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
2801 rdev->raid_disk = slot;
2802 if (test_bit(In_sync, &rdev->flags))
2803 rdev->saved_raid_disk = slot;
2805 rdev->saved_raid_disk = -1;
2806 clear_bit(In_sync, &rdev->flags);
2807 clear_bit(Bitmap_sync, &rdev->flags);
2808 err = rdev->mddev->pers->
2809 hot_add_disk(rdev->mddev, rdev);
2811 rdev->raid_disk = -1;
2814 sysfs_notify_dirent_safe(rdev->sysfs_state);
2815 if (sysfs_link_rdev(rdev->mddev, rdev))
2816 /* failure here is OK */;
2817 /* don't wakeup anyone, leave that to userspace. */
2819 if (slot >= rdev->mddev->raid_disks &&
2820 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
2822 rdev->raid_disk = slot;
2823 /* assume it is working */
2824 clear_bit(Faulty, &rdev->flags);
2825 clear_bit(WriteMostly, &rdev->flags);
2826 set_bit(In_sync, &rdev->flags);
2827 sysfs_notify_dirent_safe(rdev->sysfs_state);
2833 static struct rdev_sysfs_entry rdev_slot =
2834 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
2837 offset_show(struct md_rdev *rdev, char *page)
2839 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
2843 offset_store(struct md_rdev *rdev, const char *buf, size_t len)
2845 unsigned long long offset;
2846 if (kstrtoull(buf, 10, &offset) < 0)
2848 if (rdev->mddev->pers && rdev->raid_disk >= 0)
2850 if (rdev->sectors && rdev->mddev->external)
2851 /* Must set offset before size, so overlap checks
2854 rdev->data_offset = offset;
2855 rdev->new_data_offset = offset;
2859 static struct rdev_sysfs_entry rdev_offset =
2860 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
2862 static ssize_t new_offset_show(struct md_rdev *rdev, char *page)
2864 return sprintf(page, "%llu\n",
2865 (unsigned long long)rdev->new_data_offset);
2868 static ssize_t new_offset_store(struct md_rdev *rdev,
2869 const char *buf, size_t len)
2871 unsigned long long new_offset;
2872 struct mddev *mddev = rdev->mddev;
2874 if (kstrtoull(buf, 10, &new_offset) < 0)
2877 if (mddev->sync_thread)
2879 if (new_offset == rdev->data_offset)
2880 /* reset is always permitted */
2882 else if (new_offset > rdev->data_offset) {
2883 /* must not push array size beyond rdev_sectors */
2884 if (new_offset - rdev->data_offset
2885 + mddev->dev_sectors > rdev->sectors)
2888 /* Metadata worries about other space details. */
2890 /* decreasing the offset is inconsistent with a backwards
2893 if (new_offset < rdev->data_offset &&
2894 mddev->reshape_backwards)
2896 /* Increasing offset is inconsistent with forwards
2897 * reshape. reshape_direction should be set to
2898 * 'backwards' first.
2900 if (new_offset > rdev->data_offset &&
2901 !mddev->reshape_backwards)
2904 if (mddev->pers && mddev->persistent &&
2905 !super_types[mddev->major_version]
2906 .allow_new_offset(rdev, new_offset))
2908 rdev->new_data_offset = new_offset;
2909 if (new_offset > rdev->data_offset)
2910 mddev->reshape_backwards = 1;
2911 else if (new_offset < rdev->data_offset)
2912 mddev->reshape_backwards = 0;
2916 static struct rdev_sysfs_entry rdev_new_offset =
2917 __ATTR(new_offset, S_IRUGO|S_IWUSR, new_offset_show, new_offset_store);
2920 rdev_size_show(struct md_rdev *rdev, char *page)
2922 return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2);
2925 static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
2927 /* check if two start/length pairs overlap */
2935 static int strict_blocks_to_sectors(const char *buf, sector_t *sectors)
2937 unsigned long long blocks;
2940 if (kstrtoull(buf, 10, &blocks) < 0)
2943 if (blocks & 1ULL << (8 * sizeof(blocks) - 1))
2944 return -EINVAL; /* sector conversion overflow */
2947 if (new != blocks * 2)
2948 return -EINVAL; /* unsigned long long to sector_t overflow */
2955 rdev_size_store(struct md_rdev *rdev, const char *buf, size_t len)
2957 struct mddev *my_mddev = rdev->mddev;
2958 sector_t oldsectors = rdev->sectors;
2961 if (strict_blocks_to_sectors(buf, §ors) < 0)
2963 if (rdev->data_offset != rdev->new_data_offset)
2964 return -EINVAL; /* too confusing */
2965 if (my_mddev->pers && rdev->raid_disk >= 0) {
2966 if (my_mddev->persistent) {
2967 sectors = super_types[my_mddev->major_version].
2968 rdev_size_change(rdev, sectors);
2971 } else if (!sectors)
2972 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) -
2974 if (!my_mddev->pers->resize)
2975 /* Cannot change size for RAID0 or Linear etc */
2978 if (sectors < my_mddev->dev_sectors)
2979 return -EINVAL; /* component must fit device */
2981 rdev->sectors = sectors;
2982 if (sectors > oldsectors && my_mddev->external) {
2983 /* need to check that all other rdevs with the same ->bdev
2984 * do not overlap. We need to unlock the mddev to avoid
2985 * a deadlock. We have already changed rdev->sectors, and if
2986 * we have to change it back, we will have the lock again.
2988 struct mddev *mddev;
2990 struct list_head *tmp;
2992 mddev_unlock(my_mddev);
2993 for_each_mddev(mddev, tmp) {
2994 struct md_rdev *rdev2;
2996 mddev_lock_nointr(mddev);
2997 rdev_for_each(rdev2, mddev)
2998 if (rdev->bdev == rdev2->bdev &&
3000 overlaps(rdev->data_offset, rdev->sectors,
3006 mddev_unlock(mddev);
3012 mddev_lock_nointr(my_mddev);
3014 /* Someone else could have slipped in a size
3015 * change here, but doing so is just silly.
3016 * We put oldsectors back because we *know* it is
3017 * safe, and trust userspace not to race with
3020 rdev->sectors = oldsectors;
3027 static struct rdev_sysfs_entry rdev_size =
3028 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
3031 static ssize_t recovery_start_show(struct md_rdev *rdev, char *page)
3033 unsigned long long recovery_start = rdev->recovery_offset;
3035 if (test_bit(In_sync, &rdev->flags) ||
3036 recovery_start == MaxSector)
3037 return sprintf(page, "none\n");
3039 return sprintf(page, "%llu\n", recovery_start);
3042 static ssize_t recovery_start_store(struct md_rdev *rdev, const char *buf, size_t len)
3044 unsigned long long recovery_start;
3046 if (cmd_match(buf, "none"))
3047 recovery_start = MaxSector;
3048 else if (kstrtoull(buf, 10, &recovery_start))
3051 if (rdev->mddev->pers &&
3052 rdev->raid_disk >= 0)
3055 rdev->recovery_offset = recovery_start;
3056 if (recovery_start == MaxSector)
3057 set_bit(In_sync, &rdev->flags);
3059 clear_bit(In_sync, &rdev->flags);
3063 static struct rdev_sysfs_entry rdev_recovery_start =
3064 __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store);
3068 badblocks_show(struct badblocks *bb, char *page, int unack);
3070 badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack);
3072 static ssize_t bb_show(struct md_rdev *rdev, char *page)
3074 return badblocks_show(&rdev->badblocks, page, 0);
3076 static ssize_t bb_store(struct md_rdev *rdev, const char *page, size_t len)
3078 int rv = badblocks_store(&rdev->badblocks, page, len, 0);
3079 /* Maybe that ack was all we needed */
3080 if (test_and_clear_bit(BlockedBadBlocks, &rdev->flags))
3081 wake_up(&rdev->blocked_wait);
3084 static struct rdev_sysfs_entry rdev_bad_blocks =
3085 __ATTR(bad_blocks, S_IRUGO|S_IWUSR, bb_show, bb_store);
3088 static ssize_t ubb_show(struct md_rdev *rdev, char *page)
3090 return badblocks_show(&rdev->badblocks, page, 1);
3092 static ssize_t ubb_store(struct md_rdev *rdev, const char *page, size_t len)
3094 return badblocks_store(&rdev->badblocks, page, len, 1);
3096 static struct rdev_sysfs_entry rdev_unack_bad_blocks =
3097 __ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store);
3099 static struct attribute *rdev_default_attrs[] = {
3104 &rdev_new_offset.attr,
3106 &rdev_recovery_start.attr,
3107 &rdev_bad_blocks.attr,
3108 &rdev_unack_bad_blocks.attr,
3112 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
3114 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3115 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3116 struct mddev *mddev = rdev->mddev;
3122 rv = mddev ? mddev_lock(mddev) : -EBUSY;
3124 if (rdev->mddev == NULL)
3127 rv = entry->show(rdev, page);
3128 mddev_unlock(mddev);
3134 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
3135 const char *page, size_t length)
3137 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3138 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
3140 struct mddev *mddev = rdev->mddev;
3144 if (!capable(CAP_SYS_ADMIN))
3146 rv = mddev ? mddev_lock(mddev): -EBUSY;
3148 if (rdev->mddev == NULL)
3151 rv = entry->store(rdev, page, length);
3152 mddev_unlock(mddev);
3157 static void rdev_free(struct kobject *ko)
3159 struct md_rdev *rdev = container_of(ko, struct md_rdev, kobj);
3162 static const struct sysfs_ops rdev_sysfs_ops = {
3163 .show = rdev_attr_show,
3164 .store = rdev_attr_store,
3166 static struct kobj_type rdev_ktype = {
3167 .release = rdev_free,
3168 .sysfs_ops = &rdev_sysfs_ops,
3169 .default_attrs = rdev_default_attrs,
3172 int md_rdev_init(struct md_rdev *rdev)
3175 rdev->saved_raid_disk = -1;
3176 rdev->raid_disk = -1;
3178 rdev->data_offset = 0;
3179 rdev->new_data_offset = 0;
3180 rdev->sb_events = 0;
3181 rdev->last_read_error.tv_sec = 0;
3182 rdev->last_read_error.tv_nsec = 0;
3183 rdev->sb_loaded = 0;
3184 rdev->bb_page = NULL;
3185 atomic_set(&rdev->nr_pending, 0);
3186 atomic_set(&rdev->read_errors, 0);
3187 atomic_set(&rdev->corrected_errors, 0);
3189 INIT_LIST_HEAD(&rdev->same_set);
3190 init_waitqueue_head(&rdev->blocked_wait);
3192 /* Add space to store bad block list.
3193 * This reserves the space even on arrays where it cannot
3194 * be used - I wonder if that matters
3196 rdev->badblocks.count = 0;
3197 rdev->badblocks.shift = -1; /* disabled until explicitly enabled */
3198 rdev->badblocks.page = kmalloc(PAGE_SIZE, GFP_KERNEL);
3199 seqlock_init(&rdev->badblocks.lock);
3200 if (rdev->badblocks.page == NULL)
3205 EXPORT_SYMBOL_GPL(md_rdev_init);
3207 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3209 * mark the device faulty if:
3211 * - the device is nonexistent (zero size)
3212 * - the device has no valid superblock
3214 * a faulty rdev _never_ has rdev->sb set.
3216 static struct md_rdev *md_import_device(dev_t newdev, int super_format, int super_minor)
3218 char b[BDEVNAME_SIZE];
3220 struct md_rdev *rdev;
3223 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
3225 printk(KERN_ERR "md: could not alloc mem for new device!\n");
3226 return ERR_PTR(-ENOMEM);
3229 err = md_rdev_init(rdev);
3232 err = alloc_disk_sb(rdev);
3236 err = lock_rdev(rdev, newdev, super_format == -2);
3240 kobject_init(&rdev->kobj, &rdev_ktype);
3242 size = i_size_read(rdev->bdev->bd_inode) >> BLOCK_SIZE_BITS;
3245 "md: %s has zero or unknown size, marking faulty!\n",
3246 bdevname(rdev->bdev,b));
3251 if (super_format >= 0) {
3252 err = super_types[super_format].
3253 load_super(rdev, NULL, super_minor);
3254 if (err == -EINVAL) {
3256 "md: %s does not have a valid v%d.%d "
3257 "superblock, not importing!\n",
3258 bdevname(rdev->bdev,b),
3259 super_format, super_minor);
3264 "md: could not read %s's sb, not importing!\n",
3265 bdevname(rdev->bdev,b));
3275 md_rdev_clear(rdev);
3277 return ERR_PTR(err);
3281 * Check a full RAID array for plausibility
3285 static void analyze_sbs(struct mddev * mddev)
3288 struct md_rdev *rdev, *freshest, *tmp;
3289 char b[BDEVNAME_SIZE];
3292 rdev_for_each_safe(rdev, tmp, mddev)
3293 switch (super_types[mddev->major_version].
3294 load_super(rdev, freshest, mddev->minor_version)) {
3302 "md: fatal superblock inconsistency in %s"
3303 " -- removing from array\n",
3304 bdevname(rdev->bdev,b));
3305 kick_rdev_from_array(rdev);
3309 super_types[mddev->major_version].
3310 validate_super(mddev, freshest);
3313 rdev_for_each_safe(rdev, tmp, mddev) {
3314 if (mddev->max_disks &&
3315 (rdev->desc_nr >= mddev->max_disks ||
3316 i > mddev->max_disks)) {
3318 "md: %s: %s: only %d devices permitted\n",
3319 mdname(mddev), bdevname(rdev->bdev, b),
3321 kick_rdev_from_array(rdev);
3324 if (rdev != freshest)
3325 if (super_types[mddev->major_version].
3326 validate_super(mddev, rdev)) {
3327 printk(KERN_WARNING "md: kicking non-fresh %s"
3329 bdevname(rdev->bdev,b));
3330 kick_rdev_from_array(rdev);
3333 if (mddev->level == LEVEL_MULTIPATH) {
3334 rdev->desc_nr = i++;
3335 rdev->raid_disk = rdev->desc_nr;
3336 set_bit(In_sync, &rdev->flags);
3337 } else if (rdev->raid_disk >= (mddev->raid_disks - min(0, mddev->delta_disks))) {
3338 rdev->raid_disk = -1;
3339 clear_bit(In_sync, &rdev->flags);
3344 /* Read a fixed-point number.
3345 * Numbers in sysfs attributes should be in "standard" units where
3346 * possible, so time should be in seconds.
3347 * However we internally use a a much smaller unit such as
3348 * milliseconds or jiffies.
3349 * This function takes a decimal number with a possible fractional
3350 * component, and produces an integer which is the result of
3351 * multiplying that number by 10^'scale'.
3352 * all without any floating-point arithmetic.
3354 int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale)
3356 unsigned long result = 0;
3358 while (isdigit(*cp) || (*cp == '.' && decimals < 0)) {
3361 else if (decimals < scale) {
3364 result = result * 10 + value;
3376 while (decimals < scale) {
3385 static void md_safemode_timeout(unsigned long data);
3388 safe_delay_show(struct mddev *mddev, char *page)
3390 int msec = (mddev->safemode_delay*1000)/HZ;
3391 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
3394 safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len)
3398 if (strict_strtoul_scaled(cbuf, &msec, 3) < 0)
3401 mddev->safemode_delay = 0;
3403 unsigned long old_delay = mddev->safemode_delay;
3404 mddev->safemode_delay = (msec*HZ)/1000;
3405 if (mddev->safemode_delay == 0)
3406 mddev->safemode_delay = 1;
3407 if (mddev->safemode_delay < old_delay || old_delay == 0)
3408 md_safemode_timeout((unsigned long)mddev);
3412 static struct md_sysfs_entry md_safe_delay =
3413 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
3416 level_show(struct mddev *mddev, char *page)
3418 struct md_personality *p = mddev->pers;
3420 return sprintf(page, "%s\n", p->name);
3421 else if (mddev->clevel[0])
3422 return sprintf(page, "%s\n", mddev->clevel);
3423 else if (mddev->level != LEVEL_NONE)
3424 return sprintf(page, "%d\n", mddev->level);
3430 level_store(struct mddev *mddev, const char *buf, size_t len)
3434 struct md_personality *pers;
3437 struct md_rdev *rdev;
3439 if (mddev->pers == NULL) {
3442 if (len >= sizeof(mddev->clevel))
3444 strncpy(mddev->clevel, buf, len);
3445 if (mddev->clevel[len-1] == '\n')
3447 mddev->clevel[len] = 0;
3448 mddev->level = LEVEL_NONE;
3452 /* request to change the personality. Need to ensure:
3453 * - array is not engaged in resync/recovery/reshape
3454 * - old personality can be suspended
3455 * - new personality will access other array.
3458 if (mddev->sync_thread ||
3459 mddev->reshape_position != MaxSector ||
3460 mddev->sysfs_active)
3463 if (!mddev->pers->quiesce) {
3464 printk(KERN_WARNING "md: %s: %s does not support online personality change\n",
3465 mdname(mddev), mddev->pers->name);
3469 /* Now find the new personality */
3470 if (len == 0 || len >= sizeof(clevel))
3472 strncpy(clevel, buf, len);
3473 if (clevel[len-1] == '\n')
3476 if (kstrtol(clevel, 10, &level))
3479 if (request_module("md-%s", clevel) != 0)
3480 request_module("md-level-%s", clevel);
3481 spin_lock(&pers_lock);
3482 pers = find_pers(level, clevel);
3483 if (!pers || !try_module_get(pers->owner)) {
3484 spin_unlock(&pers_lock);
3485 printk(KERN_WARNING "md: personality %s not loaded\n", clevel);
3488 spin_unlock(&pers_lock);
3490 if (pers == mddev->pers) {
3491 /* Nothing to do! */
3492 module_put(pers->owner);
3495 if (!pers->takeover) {
3496 module_put(pers->owner);
3497 printk(KERN_WARNING "md: %s: %s does not support personality takeover\n",
3498 mdname(mddev), clevel);
3502 rdev_for_each(rdev, mddev)
3503 rdev->new_raid_disk = rdev->raid_disk;
3505 /* ->takeover must set new_* and/or delta_disks
3506 * if it succeeds, and may set them when it fails.
3508 priv = pers->takeover(mddev);
3510 mddev->new_level = mddev->level;
3511 mddev->new_layout = mddev->layout;
3512 mddev->new_chunk_sectors = mddev->chunk_sectors;
3513 mddev->raid_disks -= mddev->delta_disks;
3514 mddev->delta_disks = 0;
3515 mddev->reshape_backwards = 0;
3516 module_put(pers->owner);
3517 printk(KERN_WARNING "md: %s: %s would not accept array\n",
3518 mdname(mddev), clevel);
3519 return PTR_ERR(priv);
3522 /* Looks like we have a winner */
3523 mddev_suspend(mddev);
3524 mddev->pers->stop(mddev);
3526 if (mddev->pers->sync_request == NULL &&
3527 pers->sync_request != NULL) {
3528 /* need to add the md_redundancy_group */
3529 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
3531 "md: cannot register extra attributes for %s\n",
3533 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action");
3535 if (mddev->pers->sync_request != NULL &&
3536 pers->sync_request == NULL) {
3537 /* need to remove the md_redundancy_group */
3538 if (mddev->to_remove == NULL)
3539 mddev->to_remove = &md_redundancy_group;
3542 if (mddev->pers->sync_request == NULL &&
3544 /* We are converting from a no-redundancy array
3545 * to a redundancy array and metadata is managed
3546 * externally so we need to be sure that writes
3547 * won't block due to a need to transition
3549 * until external management is started.
3552 mddev->safemode_delay = 0;
3553 mddev->safemode = 0;
3556 rdev_for_each(rdev, mddev) {
3557 if (rdev->raid_disk < 0)
3559 if (rdev->new_raid_disk >= mddev->raid_disks)
3560 rdev->new_raid_disk = -1;
3561 if (rdev->new_raid_disk == rdev->raid_disk)
3563 sysfs_unlink_rdev(mddev, rdev);
3565 rdev_for_each(rdev, mddev) {
3566 if (rdev->raid_disk < 0)
3568 if (rdev->new_raid_disk == rdev->raid_disk)
3570 rdev->raid_disk = rdev->new_raid_disk;
3571 if (rdev->raid_disk < 0)
3572 clear_bit(In_sync, &rdev->flags);
3574 if (sysfs_link_rdev(mddev, rdev))
3575 printk(KERN_WARNING "md: cannot register rd%d"
3576 " for %s after level change\n",
3577 rdev->raid_disk, mdname(mddev));
3581 module_put(mddev->pers->owner);
3583 mddev->private = priv;
3584 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
3585 mddev->level = mddev->new_level;
3586 mddev->layout = mddev->new_layout;
3587 mddev->chunk_sectors = mddev->new_chunk_sectors;
3588 mddev->delta_disks = 0;
3589 mddev->reshape_backwards = 0;
3590 mddev->degraded = 0;
3591 if (mddev->pers->sync_request == NULL) {
3592 /* this is now an array without redundancy, so
3593 * it must always be in_sync
3596 del_timer_sync(&mddev->safemode_timer);
3598 blk_set_stacking_limits(&mddev->queue->limits);
3600 set_bit(MD_CHANGE_DEVS, &mddev->flags);
3601 mddev_resume(mddev);
3602 sysfs_notify(&mddev->kobj, NULL, "level");
3603 md_new_event(mddev);
3607 static struct md_sysfs_entry md_level =
3608 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
3612 layout_show(struct mddev *mddev, char *page)
3614 /* just a number, not meaningful for all levels */
3615 if (mddev->reshape_position != MaxSector &&
3616 mddev->layout != mddev->new_layout)
3617 return sprintf(page, "%d (%d)\n",
3618 mddev->new_layout, mddev->layout);
3619 return sprintf(page, "%d\n", mddev->layout);
3623 layout_store(struct mddev *mddev, const char *buf, size_t len)
3626 unsigned long n = simple_strtoul(buf, &e, 10);
3628 if (!*buf || (*e && *e != '\n'))
3633 if (mddev->pers->check_reshape == NULL)
3635 mddev->new_layout = n;
3636 err = mddev->pers->check_reshape(mddev);
3638 mddev->new_layout = mddev->layout;
3642 mddev->new_layout = n;
3643 if (mddev->reshape_position == MaxSector)
3648 static struct md_sysfs_entry md_layout =
3649 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
3653 raid_disks_show(struct mddev *mddev, char *page)
3655 if (mddev->raid_disks == 0)
3657 if (mddev->reshape_position != MaxSector &&
3658 mddev->delta_disks != 0)
3659 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
3660 mddev->raid_disks - mddev->delta_disks);
3661 return sprintf(page, "%d\n", mddev->raid_disks);
3664 static int update_raid_disks(struct mddev *mddev, int raid_disks);
3667 raid_disks_store(struct mddev *mddev, const char *buf, size_t len)
3671 unsigned long n = simple_strtoul(buf, &e, 10);
3673 if (!*buf || (*e && *e != '\n'))
3677 rv = update_raid_disks(mddev, n);
3678 else if (mddev->reshape_position != MaxSector) {
3679 struct md_rdev *rdev;
3680 int olddisks = mddev->raid_disks - mddev->delta_disks;
3682 rdev_for_each(rdev, mddev) {
3684 rdev->data_offset < rdev->new_data_offset)
3687 rdev->data_offset > rdev->new_data_offset)
3690 mddev->delta_disks = n - olddisks;
3691 mddev->raid_disks = n;
3692 mddev->reshape_backwards = (mddev->delta_disks < 0);
3694 mddev->raid_disks = n;
3695 return rv ? rv : len;
3697 static struct md_sysfs_entry md_raid_disks =
3698 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
3701 chunk_size_show(struct mddev *mddev, char *page)
3703 if (mddev->reshape_position != MaxSector &&
3704 mddev->chunk_sectors != mddev->new_chunk_sectors)
3705 return sprintf(page, "%d (%d)\n",
3706 mddev->new_chunk_sectors << 9,
3707 mddev->chunk_sectors << 9);
3708 return sprintf(page, "%d\n", mddev->chunk_sectors << 9);
3712 chunk_size_store(struct mddev *mddev, const char *buf, size_t len)
3715 unsigned long n = simple_strtoul(buf, &e, 10);
3717 if (!*buf || (*e && *e != '\n'))
3722 if (mddev->pers->check_reshape == NULL)
3724 mddev->new_chunk_sectors = n >> 9;
3725 err = mddev->pers->check_reshape(mddev);
3727 mddev->new_chunk_sectors = mddev->chunk_sectors;
3731 mddev->new_chunk_sectors = n >> 9;
3732 if (mddev->reshape_position == MaxSector)
3733 mddev->chunk_sectors = n >> 9;
3737 static struct md_sysfs_entry md_chunk_size =
3738 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
3741 resync_start_show(struct mddev *mddev, char *page)
3743 if (mddev->recovery_cp == MaxSector)
3744 return sprintf(page, "none\n");
3745 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
3749 resync_start_store(struct mddev *mddev, const char *buf, size_t len)
3752 unsigned long long n = simple_strtoull(buf, &e, 10);
3754 if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
3756 if (cmd_match(buf, "none"))
3758 else if (!*buf || (*e && *e != '\n'))
3761 mddev->recovery_cp = n;
3763 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
3766 static struct md_sysfs_entry md_resync_start =
3767 __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store);
3770 * The array state can be:
3773 * No devices, no size, no level
3774 * Equivalent to STOP_ARRAY ioctl
3776 * May have some settings, but array is not active
3777 * all IO results in error
3778 * When written, doesn't tear down array, but just stops it
3779 * suspended (not supported yet)
3780 * All IO requests will block. The array can be reconfigured.
3781 * Writing this, if accepted, will block until array is quiescent
3783 * no resync can happen. no superblocks get written.
3784 * write requests fail
3786 * like readonly, but behaves like 'clean' on a write request.
3788 * clean - no pending writes, but otherwise active.
3789 * When written to inactive array, starts without resync
3790 * If a write request arrives then
3791 * if metadata is known, mark 'dirty' and switch to 'active'.
3792 * if not known, block and switch to write-pending
3793 * If written to an active array that has pending writes, then fails.
3795 * fully active: IO and resync can be happening.
3796 * When written to inactive array, starts with resync
3799 * clean, but writes are blocked waiting for 'active' to be written.
3802 * like active, but no writes have been seen for a while (100msec).
3805 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
3806 write_pending, active_idle, bad_word};
3807 static char *array_states[] = {
3808 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3809 "write-pending", "active-idle", NULL };
3811 static int match_word(const char *word, char **list)
3814 for (n=0; list[n]; n++)
3815 if (cmd_match(word, list[n]))
3821 array_state_show(struct mddev *mddev, char *page)
3823 enum array_state st = inactive;
3836 else if (test_bit(MD_CHANGE_PENDING, &mddev->flags))
3838 else if (mddev->safemode)
3844 if (list_empty(&mddev->disks) &&
3845 mddev->raid_disks == 0 &&
3846 mddev->dev_sectors == 0)
3851 return sprintf(page, "%s\n", array_states[st]);
3854 static int do_md_stop(struct mddev * mddev, int ro, struct block_device *bdev);
3855 static int md_set_readonly(struct mddev * mddev, struct block_device *bdev);
3856 static int do_md_run(struct mddev * mddev);
3857 static int restart_array(struct mddev *mddev);
3860 array_state_store(struct mddev *mddev, const char *buf, size_t len)
3863 enum array_state st = match_word(buf, array_states);
3868 /* stopping an active array */
3869 err = do_md_stop(mddev, 0, NULL);
3872 /* stopping an active array */
3874 err = do_md_stop(mddev, 2, NULL);
3876 err = 0; /* already inactive */
3879 break; /* not supported yet */
3882 err = md_set_readonly(mddev, NULL);
3885 set_disk_ro(mddev->gendisk, 1);
3886 err = do_md_run(mddev);
3892 err = md_set_readonly(mddev, NULL);
3893 else if (mddev->ro == 1)
3894 err = restart_array(mddev);
3897 set_disk_ro(mddev->gendisk, 0);
3901 err = do_md_run(mddev);
3906 restart_array(mddev);
3907 spin_lock_irq(&mddev->write_lock);
3908 if (atomic_read(&mddev->writes_pending) == 0) {
3909 if (mddev->in_sync == 0) {
3911 if (mddev->safemode == 1)
3912 mddev->safemode = 0;
3913 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
3918 spin_unlock_irq(&mddev->write_lock);
3924 restart_array(mddev);
3925 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
3926 wake_up(&mddev->sb_wait);
3930 set_disk_ro(mddev->gendisk, 0);
3931 err = do_md_run(mddev);
3936 /* these cannot be set */
3942 if (mddev->hold_active == UNTIL_IOCTL)
3943 mddev->hold_active = 0;
3944 sysfs_notify_dirent_safe(mddev->sysfs_state);
3948 static struct md_sysfs_entry md_array_state =
3949 __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
3952 max_corrected_read_errors_show(struct mddev *mddev, char *page) {
3953 return sprintf(page, "%d\n",
3954 atomic_read(&mddev->max_corr_read_errors));
3958 max_corrected_read_errors_store(struct mddev *mddev, const char *buf, size_t len)
3961 unsigned long n = simple_strtoul(buf, &e, 10);
3963 if (*buf && (*e == 0 || *e == '\n')) {
3964 atomic_set(&mddev->max_corr_read_errors, n);
3970 static struct md_sysfs_entry max_corr_read_errors =
3971 __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show,
3972 max_corrected_read_errors_store);
3975 null_show(struct mddev *mddev, char *page)
3981 new_dev_store(struct mddev *mddev, const char *buf, size_t len)
3983 /* buf must be %d:%d\n? giving major and minor numbers */
3984 /* The new device is added to the array.
3985 * If the array has a persistent superblock, we read the
3986 * superblock to initialise info and check validity.
3987 * Otherwise, only checking done is that in bind_rdev_to_array,
3988 * which mainly checks size.
3991 int major = simple_strtoul(buf, &e, 10);
3994 struct md_rdev *rdev;
3997 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
3999 minor = simple_strtoul(e+1, &e, 10);
4000 if (*e && *e != '\n')
4002 dev = MKDEV(major, minor);
4003 if (major != MAJOR(dev) ||
4004 minor != MINOR(dev))
4008 if (mddev->persistent) {
4009 rdev = md_import_device(dev, mddev->major_version,
4010 mddev->minor_version);
4011 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
4012 struct md_rdev *rdev0
4013 = list_entry(mddev->disks.next,
4014 struct md_rdev, same_set);
4015 err = super_types[mddev->major_version]
4016 .load_super(rdev, rdev0, mddev->minor_version);
4020 } else if (mddev->external)
4021 rdev = md_import_device(dev, -2, -1);
4023 rdev = md_import_device(dev, -1, -1);
4026 return PTR_ERR(rdev);
4027 err = bind_rdev_to_array(rdev, mddev);
4031 return err ? err : len;
4034 static struct md_sysfs_entry md_new_device =
4035 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
4038 bitmap_store(struct mddev *mddev, const char *buf, size_t len)
4041 unsigned long chunk, end_chunk;
4045 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
4047 chunk = end_chunk = simple_strtoul(buf, &end, 0);
4048 if (buf == end) break;
4049 if (*end == '-') { /* range */
4051 end_chunk = simple_strtoul(buf, &end, 0);
4052 if (buf == end) break;
4054 if (*end && !isspace(*end)) break;
4055 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
4056 buf = skip_spaces(end);
4058 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
4063 static struct md_sysfs_entry md_bitmap =
4064 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
4067 size_show(struct mddev *mddev, char *page)
4069 return sprintf(page, "%llu\n",
4070 (unsigned long long)mddev->dev_sectors / 2);
4073 static int update_size(struct mddev *mddev, sector_t num_sectors);
4076 size_store(struct mddev *mddev, const char *buf, size_t len)
4078 /* If array is inactive, we can reduce the component size, but
4079 * not increase it (except from 0).
4080 * If array is active, we can try an on-line resize
4083 int err = strict_blocks_to_sectors(buf, §ors);
4088 err = update_size(mddev, sectors);
4089 md_update_sb(mddev, 1);
4091 if (mddev->dev_sectors == 0 ||
4092 mddev->dev_sectors > sectors)
4093 mddev->dev_sectors = sectors;
4097 return err ? err : len;
4100 static struct md_sysfs_entry md_size =
4101 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
4104 /* Metadata version.
4106 * 'none' for arrays with no metadata (good luck...)
4107 * 'external' for arrays with externally managed metadata,
4108 * or N.M for internally known formats
4111 metadata_show(struct mddev *mddev, char *page)
4113 if (mddev->persistent)
4114 return sprintf(page, "%d.%d\n",
4115 mddev->major_version, mddev->minor_version);
4116 else if (mddev->external)
4117 return sprintf(page, "external:%s\n", mddev->metadata_type);
4119 return sprintf(page, "none\n");
4123 metadata_store(struct mddev *mddev, const char *buf, size_t len)
4127 /* Changing the details of 'external' metadata is
4128 * always permitted. Otherwise there must be
4129 * no devices attached to the array.
4131 if (mddev->external && strncmp(buf, "external:", 9) == 0)
4133 else if (!list_empty(&mddev->disks))
4136 if (cmd_match(buf, "none")) {
4137 mddev->persistent = 0;
4138 mddev->external = 0;
4139 mddev->major_version = 0;
4140 mddev->minor_version = 90;
4143 if (strncmp(buf, "external:", 9) == 0) {
4144 size_t namelen = len-9;
4145 if (namelen >= sizeof(mddev->metadata_type))
4146 namelen = sizeof(mddev->metadata_type)-1;
4147 strncpy(mddev->metadata_type, buf+9, namelen);
4148 mddev->metadata_type[namelen] = 0;
4149 if (namelen && mddev->metadata_type[namelen-1] == '\n')
4150 mddev->metadata_type[--namelen] = 0;
4151 mddev->persistent = 0;
4152 mddev->external = 1;
4153 mddev->major_version = 0;
4154 mddev->minor_version = 90;
4157 major = simple_strtoul(buf, &e, 10);
4158 if (e==buf || *e != '.')
4161 minor = simple_strtoul(buf, &e, 10);
4162 if (e==buf || (*e && *e != '\n') )
4164 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
4166 mddev->major_version = major;
4167 mddev->minor_version = minor;
4168 mddev->persistent = 1;
4169 mddev->external = 0;
4173 static struct md_sysfs_entry md_metadata =
4174 __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
4177 action_show(struct mddev *mddev, char *page)
4179 char *type = "idle";
4180 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
4182 else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
4183 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) {
4184 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
4186 else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
4187 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
4189 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
4193 } else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
4196 return sprintf(page, "%s\n", type);
4200 action_store(struct mddev *mddev, const char *page, size_t len)
4202 if (!mddev->pers || !mddev->pers->sync_request)
4205 if (cmd_match(page, "frozen"))
4206 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4208 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4210 if (cmd_match(page, "idle") || cmd_match(page, "frozen")) {
4211 if (mddev->sync_thread) {
4212 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4213 md_reap_sync_thread(mddev);
4215 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
4216 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
4218 else if (cmd_match(page, "resync"))
4219 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4220 else if (cmd_match(page, "recover")) {
4221 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
4222 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4223 } else if (cmd_match(page, "reshape")) {
4225 if (mddev->pers->start_reshape == NULL)
4227 err = mddev->pers->start_reshape(mddev);
4230 sysfs_notify(&mddev->kobj, NULL, "degraded");
4232 if (cmd_match(page, "check"))
4233 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
4234 else if (!cmd_match(page, "repair"))
4236 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
4237 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
4239 if (mddev->ro == 2) {
4240 /* A write to sync_action is enough to justify
4241 * canceling read-auto mode
4244 md_wakeup_thread(mddev->sync_thread);
4246 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4247 md_wakeup_thread(mddev->thread);
4248 sysfs_notify_dirent_safe(mddev->sysfs_action);
4252 static struct md_sysfs_entry md_scan_mode =
4253 __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
4256 last_sync_action_show(struct mddev *mddev, char *page)
4258 return sprintf(page, "%s\n", mddev->last_sync_action);
4261 static struct md_sysfs_entry md_last_scan_mode = __ATTR_RO(last_sync_action);
4264 mismatch_cnt_show(struct mddev *mddev, char *page)
4266 return sprintf(page, "%llu\n",
4267 (unsigned long long)
4268 atomic64_read(&mddev->resync_mismatches));
4271 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
4274 sync_min_show(struct mddev *mddev, char *page)
4276 return sprintf(page, "%d (%s)\n", speed_min(mddev),
4277 mddev->sync_speed_min ? "local": "system");
4281 sync_min_store(struct mddev *mddev, const char *buf, size_t len)
4285 if (strncmp(buf, "system", 6)==0) {
4286 mddev->sync_speed_min = 0;
4289 min = simple_strtoul(buf, &e, 10);
4290 if (buf == e || (*e && *e != '\n') || min <= 0)
4292 mddev->sync_speed_min = min;
4296 static struct md_sysfs_entry md_sync_min =
4297 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
4300 sync_max_show(struct mddev *mddev, char *page)
4302 return sprintf(page, "%d (%s)\n", speed_max(mddev),
4303 mddev->sync_speed_max ? "local": "system");
4307 sync_max_store(struct mddev *mddev, const char *buf, size_t len)
4311 if (strncmp(buf, "system", 6)==0) {
4312 mddev->sync_speed_max = 0;
4315 max = simple_strtoul(buf, &e, 10);
4316 if (buf == e || (*e && *e != '\n') || max <= 0)
4318 mddev->sync_speed_max = max;
4322 static struct md_sysfs_entry md_sync_max =
4323 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
4326 degraded_show(struct mddev *mddev, char *page)
4328 return sprintf(page, "%d\n", mddev->degraded);
4330 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
4333 sync_force_parallel_show(struct mddev *mddev, char *page)
4335 return sprintf(page, "%d\n", mddev->parallel_resync);
4339 sync_force_parallel_store(struct mddev *mddev, const char *buf, size_t len)
4343 if (kstrtol(buf, 10, &n))
4346 if (n != 0 && n != 1)
4349 mddev->parallel_resync = n;
4351 if (mddev->sync_thread)
4352 wake_up(&resync_wait);
4357 /* force parallel resync, even with shared block devices */
4358 static struct md_sysfs_entry md_sync_force_parallel =
4359 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
4360 sync_force_parallel_show, sync_force_parallel_store);
4363 sync_speed_show(struct mddev *mddev, char *page)
4365 unsigned long resync, dt, db;
4366 if (mddev->curr_resync == 0)
4367 return sprintf(page, "none\n");
4368 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
4369 dt = (jiffies - mddev->resync_mark) / HZ;
4371 db = resync - mddev->resync_mark_cnt;
4372 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
4375 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
4378 sync_completed_show(struct mddev *mddev, char *page)
4380 unsigned long long max_sectors, resync;
4382 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4383 return sprintf(page, "none\n");
4385 if (mddev->curr_resync == 1 ||
4386 mddev->curr_resync == 2)
4387 return sprintf(page, "delayed\n");
4389 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
4390 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
4391 max_sectors = mddev->resync_max_sectors;
4393 max_sectors = mddev->dev_sectors;
4395 resync = mddev->curr_resync_completed;
4396 return sprintf(page, "%llu / %llu\n", resync, max_sectors);
4399 static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed);
4402 min_sync_show(struct mddev *mddev, char *page)
4404 return sprintf(page, "%llu\n",
4405 (unsigned long long)mddev->resync_min);
4408 min_sync_store(struct mddev *mddev, const char *buf, size_t len)
4410 unsigned long long min;
4411 if (kstrtoull(buf, 10, &min))
4413 if (min > mddev->resync_max)
4415 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4418 /* Must be a multiple of chunk_size */
4419 if (mddev->chunk_sectors) {
4420 sector_t temp = min;
4421 if (sector_div(temp, mddev->chunk_sectors))
4424 mddev->resync_min = min;
4429 static struct md_sysfs_entry md_min_sync =
4430 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
4433 max_sync_show(struct mddev *mddev, char *page)
4435 if (mddev->resync_max == MaxSector)
4436 return sprintf(page, "max\n");
4438 return sprintf(page, "%llu\n",
4439 (unsigned long long)mddev->resync_max);
4442 max_sync_store(struct mddev *mddev, const char *buf, size_t len)
4444 if (strncmp(buf, "max", 3) == 0)
4445 mddev->resync_max = MaxSector;
4447 unsigned long long max;
4448 if (kstrtoull(buf, 10, &max))
4450 if (max < mddev->resync_min)
4452 if (max < mddev->resync_max &&
4454 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4457 /* Must be a multiple of chunk_size */
4458 if (mddev->chunk_sectors) {
4459 sector_t temp = max;
4460 if (sector_div(temp, mddev->chunk_sectors))
4463 mddev->resync_max = max;
4465 wake_up(&mddev->recovery_wait);
4469 static struct md_sysfs_entry md_max_sync =
4470 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
4473 suspend_lo_show(struct mddev *mddev, char *page)
4475 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
4479 suspend_lo_store(struct mddev *mddev, const char *buf, size_t len)
4482 unsigned long long new = simple_strtoull(buf, &e, 10);
4483 unsigned long long old = mddev->suspend_lo;
4485 if (mddev->pers == NULL ||
4486 mddev->pers->quiesce == NULL)
4488 if (buf == e || (*e && *e != '\n'))
4491 mddev->suspend_lo = new;
4493 /* Shrinking suspended region */
4494 mddev->pers->quiesce(mddev, 2);
4496 /* Expanding suspended region - need to wait */
4497 mddev->pers->quiesce(mddev, 1);
4498 mddev->pers->quiesce(mddev, 0);
4502 static struct md_sysfs_entry md_suspend_lo =
4503 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
4507 suspend_hi_show(struct mddev *mddev, char *page)
4509 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
4513 suspend_hi_store(struct mddev *mddev, const char *buf, size_t len)
4516 unsigned long long new = simple_strtoull(buf, &e, 10);
4517 unsigned long long old = mddev->suspend_hi;
4519 if (mddev->pers == NULL ||
4520 mddev->pers->quiesce == NULL)
4522 if (buf == e || (*e && *e != '\n'))
4525 mddev->suspend_hi = new;
4527 /* Shrinking suspended region */
4528 mddev->pers->quiesce(mddev, 2);
4530 /* Expanding suspended region - need to wait */
4531 mddev->pers->quiesce(mddev, 1);
4532 mddev->pers->quiesce(mddev, 0);
4536 static struct md_sysfs_entry md_suspend_hi =
4537 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
4540 reshape_position_show(struct mddev *mddev, char *page)
4542 if (mddev->reshape_position != MaxSector)
4543 return sprintf(page, "%llu\n",
4544 (unsigned long long)mddev->reshape_position);
4545 strcpy(page, "none\n");
4550 reshape_position_store(struct mddev *mddev, const char *buf, size_t len)
4552 struct md_rdev *rdev;
4554 unsigned long long new = simple_strtoull(buf, &e, 10);
4557 if (buf == e || (*e && *e != '\n'))
4559 mddev->reshape_position = new;
4560 mddev->delta_disks = 0;
4561 mddev->reshape_backwards = 0;
4562 mddev->new_level = mddev->level;
4563 mddev->new_layout = mddev->layout;
4564 mddev->new_chunk_sectors = mddev->chunk_sectors;
4565 rdev_for_each(rdev, mddev)
4566 rdev->new_data_offset = rdev->data_offset;
4570 static struct md_sysfs_entry md_reshape_position =
4571 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
4572 reshape_position_store);
4575 reshape_direction_show(struct mddev *mddev, char *page)
4577 return sprintf(page, "%s\n",
4578 mddev->reshape_backwards ? "backwards" : "forwards");
4582 reshape_direction_store(struct mddev *mddev, const char *buf, size_t len)
4585 if (cmd_match(buf, "forwards"))
4587 else if (cmd_match(buf, "backwards"))
4591 if (mddev->reshape_backwards == backwards)
4594 /* check if we are allowed to change */
4595 if (mddev->delta_disks)
4598 if (mddev->persistent &&
4599 mddev->major_version == 0)
4602 mddev->reshape_backwards = backwards;
4606 static struct md_sysfs_entry md_reshape_direction =
4607 __ATTR(reshape_direction, S_IRUGO|S_IWUSR, reshape_direction_show,
4608 reshape_direction_store);
4611 array_size_show(struct mddev *mddev, char *page)
4613 if (mddev->external_size)
4614 return sprintf(page, "%llu\n",
4615 (unsigned long long)mddev->array_sectors/2);
4617 return sprintf(page, "default\n");
4621 array_size_store(struct mddev *mddev, const char *buf, size_t len)
4625 if (strncmp(buf, "default", 7) == 0) {
4627 sectors = mddev->pers->size(mddev, 0, 0);
4629 sectors = mddev->array_sectors;
4631 mddev->external_size = 0;
4633 if (strict_blocks_to_sectors(buf, §ors) < 0)
4635 if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors)
4638 mddev->external_size = 1;
4641 mddev->array_sectors = sectors;
4643 set_capacity(mddev->gendisk, mddev->array_sectors);
4644 revalidate_disk(mddev->gendisk);
4649 static struct md_sysfs_entry md_array_size =
4650 __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show,
4653 static struct attribute *md_default_attrs[] = {
4656 &md_raid_disks.attr,
4657 &md_chunk_size.attr,
4659 &md_resync_start.attr,
4661 &md_new_device.attr,
4662 &md_safe_delay.attr,
4663 &md_array_state.attr,
4664 &md_reshape_position.attr,
4665 &md_reshape_direction.attr,
4666 &md_array_size.attr,
4667 &max_corr_read_errors.attr,
4671 static struct attribute *md_redundancy_attrs[] = {
4673 &md_last_scan_mode.attr,
4674 &md_mismatches.attr,
4677 &md_sync_speed.attr,
4678 &md_sync_force_parallel.attr,
4679 &md_sync_completed.attr,
4682 &md_suspend_lo.attr,
4683 &md_suspend_hi.attr,
4688 static struct attribute_group md_redundancy_group = {
4690 .attrs = md_redundancy_attrs,
4695 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
4697 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
4698 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
4703 spin_lock(&all_mddevs_lock);
4704 if (list_empty(&mddev->all_mddevs)) {
4705 spin_unlock(&all_mddevs_lock);
4709 spin_unlock(&all_mddevs_lock);
4711 rv = mddev_lock(mddev);
4713 rv = entry->show(mddev, page);
4714 mddev_unlock(mddev);
4721 md_attr_store(struct kobject *kobj, struct attribute *attr,
4722 const char *page, size_t length)
4724 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
4725 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
4730 if (!capable(CAP_SYS_ADMIN))
4732 spin_lock(&all_mddevs_lock);
4733 if (list_empty(&mddev->all_mddevs)) {
4734 spin_unlock(&all_mddevs_lock);
4738 spin_unlock(&all_mddevs_lock);
4739 if (entry->store == new_dev_store)
4740 flush_workqueue(md_misc_wq);
4741 rv = mddev_lock(mddev);
4743 rv = entry->store(mddev, page, length);
4744 mddev_unlock(mddev);
4750 static void md_free(struct kobject *ko)
4752 struct mddev *mddev = container_of(ko, struct mddev, kobj);
4754 if (mddev->sysfs_state)
4755 sysfs_put(mddev->sysfs_state);
4757 if (mddev->gendisk) {
4758 del_gendisk(mddev->gendisk);
4759 put_disk(mddev->gendisk);
4762 blk_cleanup_queue(mddev->queue);
4767 static const struct sysfs_ops md_sysfs_ops = {
4768 .show = md_attr_show,
4769 .store = md_attr_store,
4771 static struct kobj_type md_ktype = {
4773 .sysfs_ops = &md_sysfs_ops,
4774 .default_attrs = md_default_attrs,
4779 static void mddev_delayed_delete(struct work_struct *ws)
4781 struct mddev *mddev = container_of(ws, struct mddev, del_work);
4783 sysfs_remove_group(&mddev->kobj, &md_bitmap_group);
4784 kobject_del(&mddev->kobj);
4785 kobject_put(&mddev->kobj);
4788 static int md_alloc(dev_t dev, char *name)
4790 static DEFINE_MUTEX(disks_mutex);
4791 struct mddev *mddev = mddev_find(dev);
4792 struct gendisk *disk;
4801 partitioned = (MAJOR(mddev->unit) != MD_MAJOR);
4802 shift = partitioned ? MdpMinorShift : 0;
4803 unit = MINOR(mddev->unit) >> shift;
4805 /* wait for any previous instance of this device to be
4806 * completely removed (mddev_delayed_delete).
4808 flush_workqueue(md_misc_wq);
4810 mutex_lock(&disks_mutex);
4816 /* Need to ensure that 'name' is not a duplicate.
4818 struct mddev *mddev2;
4819 spin_lock(&all_mddevs_lock);
4821 list_for_each_entry(mddev2, &all_mddevs, all_mddevs)
4822 if (mddev2->gendisk &&
4823 strcmp(mddev2->gendisk->disk_name, name) == 0) {
4824 spin_unlock(&all_mddevs_lock);
4827 spin_unlock(&all_mddevs_lock);
4831 mddev->queue = blk_alloc_queue(GFP_KERNEL);
4834 mddev->queue->queuedata = mddev;
4836 blk_queue_make_request(mddev->queue, md_make_request);
4837 blk_set_stacking_limits(&mddev->queue->limits);
4839 disk = alloc_disk(1 << shift);
4841 blk_cleanup_queue(mddev->queue);
4842 mddev->queue = NULL;
4845 disk->major = MAJOR(mddev->unit);
4846 disk->first_minor = unit << shift;
4848 strcpy(disk->disk_name, name);
4849 else if (partitioned)
4850 sprintf(disk->disk_name, "md_d%d", unit);
4852 sprintf(disk->disk_name, "md%d", unit);
4853 disk->fops = &md_fops;
4854 disk->private_data = mddev;
4855 disk->queue = mddev->queue;
4856 blk_queue_flush(mddev->queue, REQ_FLUSH | REQ_FUA);
4857 /* Allow extended partitions. This makes the
4858 * 'mdp' device redundant, but we can't really
4861 disk->flags |= GENHD_FL_EXT_DEVT;
4862 mddev->gendisk = disk;
4863 /* As soon as we call add_disk(), another thread could get
4864 * through to md_open, so make sure it doesn't get too far
4866 mutex_lock(&mddev->open_mutex);
4869 error = kobject_init_and_add(&mddev->kobj, &md_ktype,
4870 &disk_to_dev(disk)->kobj, "%s", "md");
4872 /* This isn't possible, but as kobject_init_and_add is marked
4873 * __must_check, we must do something with the result
4875 printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
4879 if (mddev->kobj.sd &&
4880 sysfs_create_group(&mddev->kobj, &md_bitmap_group))
4881 printk(KERN_DEBUG "pointless warning\n");
4882 mutex_unlock(&mddev->open_mutex);
4884 mutex_unlock(&disks_mutex);
4885 if (!error && mddev->kobj.sd) {
4886 kobject_uevent(&mddev->kobj, KOBJ_ADD);
4887 mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state");
4893 static struct kobject *md_probe(dev_t dev, int *part, void *data)
4895 md_alloc(dev, NULL);
4899 static int add_named_array(const char *val, struct kernel_param *kp)
4901 /* val must be "md_*" where * is not all digits.
4902 * We allocate an array with a large free minor number, and
4903 * set the name to val. val must not already be an active name.
4905 int len = strlen(val);
4906 char buf[DISK_NAME_LEN];
4908 while (len && val[len-1] == '\n')
4910 if (len >= DISK_NAME_LEN)
4912 strlcpy(buf, val, len+1);
4913 if (strncmp(buf, "md_", 3) != 0)
4915 return md_alloc(0, buf);
4918 static void md_safemode_timeout(unsigned long data)
4920 struct mddev *mddev = (struct mddev *) data;
4922 if (!atomic_read(&mddev->writes_pending)) {
4923 mddev->safemode = 1;
4924 if (mddev->external)
4925 sysfs_notify_dirent_safe(mddev->sysfs_state);
4927 md_wakeup_thread(mddev->thread);
4930 static int start_dirty_degraded;
4932 int md_run(struct mddev *mddev)
4935 struct md_rdev *rdev;
4936 struct md_personality *pers;
4938 if (list_empty(&mddev->disks))
4939 /* cannot run an array with no devices.. */
4944 /* Cannot run until previous stop completes properly */
4945 if (mddev->sysfs_active)
4949 * Analyze all RAID superblock(s)
4951 if (!mddev->raid_disks) {
4952 if (!mddev->persistent)
4957 if (mddev->level != LEVEL_NONE)
4958 request_module("md-level-%d", mddev->level);
4959 else if (mddev->clevel[0])
4960 request_module("md-%s", mddev->clevel);
4963 * Drop all container device buffers, from now on
4964 * the only valid external interface is through the md
4967 rdev_for_each(rdev, mddev) {
4968 if (test_bit(Faulty, &rdev->flags))
4970 sync_blockdev(rdev->bdev);
4971 invalidate_bdev(rdev->bdev);
4973 /* perform some consistency tests on the device.
4974 * We don't want the data to overlap the metadata,
4975 * Internal Bitmap issues have been handled elsewhere.
4977 if (rdev->meta_bdev) {
4978 /* Nothing to check */;
4979 } else if (rdev->data_offset < rdev->sb_start) {
4980 if (mddev->dev_sectors &&
4981 rdev->data_offset + mddev->dev_sectors
4983 printk("md: %s: data overlaps metadata\n",
4988 if (rdev->sb_start + rdev->sb_size/512
4989 > rdev->data_offset) {
4990 printk("md: %s: metadata overlaps data\n",
4995 sysfs_notify_dirent_safe(rdev->sysfs_state);
4998 if (mddev->bio_set == NULL)
4999 mddev->bio_set = bioset_create(BIO_POOL_SIZE, 0);
5001 spin_lock(&pers_lock);
5002 pers = find_pers(mddev->level, mddev->clevel);
5003 if (!pers || !try_module_get(pers->owner)) {
5004 spin_unlock(&pers_lock);
5005 if (mddev->level != LEVEL_NONE)
5006 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
5009 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
5014 spin_unlock(&pers_lock);
5015 if (mddev->level != pers->level) {
5016 mddev->level = pers->level;
5017 mddev->new_level = pers->level;
5019 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
5021 if (mddev->reshape_position != MaxSector &&
5022 pers->start_reshape == NULL) {
5023 /* This personality cannot handle reshaping... */
5025 module_put(pers->owner);
5029 if (pers->sync_request) {
5030 /* Warn if this is a potentially silly
5033 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
5034 struct md_rdev *rdev2;
5037 rdev_for_each(rdev, mddev)
5038 rdev_for_each(rdev2, mddev) {
5040 rdev->bdev->bd_contains ==
5041 rdev2->bdev->bd_contains) {
5043 "%s: WARNING: %s appears to be"
5044 " on the same physical disk as"
5047 bdevname(rdev->bdev,b),
5048 bdevname(rdev2->bdev,b2));
5055 "True protection against single-disk"
5056 " failure might be compromised.\n");
5059 mddev->recovery = 0;
5060 /* may be over-ridden by personality */
5061 mddev->resync_max_sectors = mddev->dev_sectors;
5063 mddev->ok_start_degraded = start_dirty_degraded;
5065 if (start_readonly && mddev->ro == 0)
5066 mddev->ro = 2; /* read-only, but switch on first write */
5068 err = mddev->pers->run(mddev);
5070 printk(KERN_ERR "md: pers->run() failed ...\n");
5071 else if (mddev->pers->size(mddev, 0, 0) < mddev->array_sectors) {
5072 WARN_ONCE(!mddev->external_size, "%s: default size too small,"
5073 " but 'external_size' not in effect?\n", __func__);
5075 "md: invalid array_size %llu > default size %llu\n",
5076 (unsigned long long)mddev->array_sectors / 2,
5077 (unsigned long long)mddev->pers->size(mddev, 0, 0) / 2);
5079 mddev->pers->stop(mddev);
5081 if (err == 0 && mddev->pers->sync_request &&
5082 (mddev->bitmap_info.file || mddev->bitmap_info.offset)) {
5083 err = bitmap_create(mddev);
5085 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
5086 mdname(mddev), err);
5087 mddev->pers->stop(mddev);
5091 module_put(mddev->pers->owner);
5093 bitmap_destroy(mddev);
5096 if (mddev->pers->sync_request) {
5097 if (mddev->kobj.sd &&
5098 sysfs_create_group(&mddev->kobj, &md_redundancy_group))
5100 "md: cannot register extra attributes for %s\n",
5102 mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action");
5103 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
5106 atomic_set(&mddev->writes_pending,0);
5107 atomic_set(&mddev->max_corr_read_errors,
5108 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS);
5109 mddev->safemode = 0;
5110 mddev->safemode_timer.function = md_safemode_timeout;
5111 mddev->safemode_timer.data = (unsigned long) mddev;
5112 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
5116 rdev_for_each(rdev, mddev)
5117 if (rdev->raid_disk >= 0)
5118 if (sysfs_link_rdev(mddev, rdev))
5119 /* failure here is OK */;
5121 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5123 if (mddev->flags & MD_UPDATE_SB_FLAGS)
5124 md_update_sb(mddev, 0);
5126 md_new_event(mddev);
5127 sysfs_notify_dirent_safe(mddev->sysfs_state);
5128 sysfs_notify_dirent_safe(mddev->sysfs_action);
5129 sysfs_notify(&mddev->kobj, NULL, "degraded");
5132 EXPORT_SYMBOL_GPL(md_run);
5134 static int do_md_run(struct mddev *mddev)
5138 err = md_run(mddev);
5141 err = bitmap_load(mddev);
5143 bitmap_destroy(mddev);
5147 md_wakeup_thread(mddev->thread);
5148 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
5150 set_capacity(mddev->gendisk, mddev->array_sectors);
5151 revalidate_disk(mddev->gendisk);
5153 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
5158 static int restart_array(struct mddev *mddev)
5160 struct gendisk *disk = mddev->gendisk;
5162 /* Complain if it has no devices */
5163 if (list_empty(&mddev->disks))
5169 mddev->safemode = 0;
5171 set_disk_ro(disk, 0);
5172 printk(KERN_INFO "md: %s switched to read-write mode.\n",
5174 /* Kick recovery or resync if necessary */
5175 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5176 md_wakeup_thread(mddev->thread);
5177 md_wakeup_thread(mddev->sync_thread);
5178 sysfs_notify_dirent_safe(mddev->sysfs_state);
5182 /* similar to deny_write_access, but accounts for our holding a reference
5183 * to the file ourselves */
5184 static int deny_bitmap_write_access(struct file * file)
5186 struct inode *inode = file->f_mapping->host;
5188 spin_lock(&inode->i_lock);
5189 if (atomic_read(&inode->i_writecount) > 1) {
5190 spin_unlock(&inode->i_lock);
5193 atomic_set(&inode->i_writecount, -1);
5194 spin_unlock(&inode->i_lock);
5199 void restore_bitmap_write_access(struct file *file)
5201 struct inode *inode = file->f_mapping->host;
5203 spin_lock(&inode->i_lock);
5204 atomic_set(&inode->i_writecount, 1);
5205 spin_unlock(&inode->i_lock);
5208 static void md_clean(struct mddev *mddev)
5210 mddev->array_sectors = 0;
5211 mddev->external_size = 0;
5212 mddev->dev_sectors = 0;
5213 mddev->raid_disks = 0;
5214 mddev->recovery_cp = 0;
5215 mddev->resync_min = 0;
5216 mddev->resync_max = MaxSector;
5217 mddev->reshape_position = MaxSector;
5218 mddev->external = 0;
5219 mddev->persistent = 0;
5220 mddev->level = LEVEL_NONE;
5221 mddev->clevel[0] = 0;
5224 mddev->metadata_type[0] = 0;
5225 mddev->chunk_sectors = 0;
5226 mddev->ctime = mddev->utime = 0;
5228 mddev->max_disks = 0;
5230 mddev->can_decrease_events = 0;
5231 mddev->delta_disks = 0;
5232 mddev->reshape_backwards = 0;
5233 mddev->new_level = LEVEL_NONE;
5234 mddev->new_layout = 0;
5235 mddev->new_chunk_sectors = 0;
5236 mddev->curr_resync = 0;
5237 atomic64_set(&mddev->resync_mismatches, 0);
5238 mddev->suspend_lo = mddev->suspend_hi = 0;
5239 mddev->sync_speed_min = mddev->sync_speed_max = 0;
5240 mddev->recovery = 0;
5243 mddev->degraded = 0;
5244 mddev->safemode = 0;
5245 mddev->merge_check_needed = 0;
5246 mddev->bitmap_info.offset = 0;
5247 mddev->bitmap_info.default_offset = 0;
5248 mddev->bitmap_info.default_space = 0;
5249 mddev->bitmap_info.chunksize = 0;
5250 mddev->bitmap_info.daemon_sleep = 0;
5251 mddev->bitmap_info.max_write_behind = 0;
5254 static void __md_stop_writes(struct mddev *mddev)
5256 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5257 if (mddev->sync_thread) {
5258 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5259 md_reap_sync_thread(mddev);
5262 del_timer_sync(&mddev->safemode_timer);
5264 bitmap_flush(mddev);
5265 md_super_wait(mddev);
5267 if (mddev->ro == 0 &&
5268 (!mddev->in_sync || (mddev->flags & MD_UPDATE_SB_FLAGS))) {
5269 /* mark array as shutdown cleanly */
5271 md_update_sb(mddev, 1);
5275 void md_stop_writes(struct mddev *mddev)
5277 mddev_lock_nointr(mddev);
5278 __md_stop_writes(mddev);
5279 mddev_unlock(mddev);
5281 EXPORT_SYMBOL_GPL(md_stop_writes);
5283 static void __md_stop(struct mddev *mddev)
5286 mddev->pers->stop(mddev);
5287 if (mddev->pers->sync_request && mddev->to_remove == NULL)
5288 mddev->to_remove = &md_redundancy_group;
5289 module_put(mddev->pers->owner);
5291 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5294 void md_stop(struct mddev *mddev)
5296 /* stop the array and free an attached data structures.
5297 * This is called from dm-raid
5300 bitmap_destroy(mddev);
5302 bioset_free(mddev->bio_set);
5305 EXPORT_SYMBOL_GPL(md_stop);
5307 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev)
5312 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
5314 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5315 md_wakeup_thread(mddev->thread);
5317 if (mddev->sync_thread) {
5318 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5319 /* Thread might be blocked waiting for metadata update
5320 * which will now never happen */
5321 wake_up_process(mddev->sync_thread->tsk);
5323 mddev_unlock(mddev);
5324 wait_event(resync_wait, mddev->sync_thread == NULL);
5325 mddev_lock_nointr(mddev);
5327 mutex_lock(&mddev->open_mutex);
5328 if (atomic_read(&mddev->openers) > !!bdev ||
5329 mddev->sync_thread ||
5330 (bdev && !test_bit(MD_STILL_CLOSED, &mddev->flags))) {
5331 printk("md: %s still in use.\n",mdname(mddev));
5333 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5334 md_wakeup_thread(mddev->thread);
5340 __md_stop_writes(mddev);
5346 set_disk_ro(mddev->gendisk, 1);
5347 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5348 sysfs_notify_dirent_safe(mddev->sysfs_state);
5352 mutex_unlock(&mddev->open_mutex);
5357 * 0 - completely stop and dis-assemble array
5358 * 2 - stop but do not disassemble array
5360 static int do_md_stop(struct mddev * mddev, int mode,
5361 struct block_device *bdev)
5363 struct gendisk *disk = mddev->gendisk;
5364 struct md_rdev *rdev;
5367 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
5369 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5370 md_wakeup_thread(mddev->thread);
5372 if (mddev->sync_thread) {
5373 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5374 /* Thread might be blocked waiting for metadata update
5375 * which will now never happen */
5376 wake_up_process(mddev->sync_thread->tsk);
5378 mddev_unlock(mddev);
5379 wait_event(resync_wait, mddev->sync_thread == NULL);
5380 mddev_lock_nointr(mddev);
5382 mutex_lock(&mddev->open_mutex);
5383 if (atomic_read(&mddev->openers) > !!bdev ||
5384 mddev->sysfs_active ||
5385 mddev->sync_thread ||
5386 (bdev && !test_bit(MD_STILL_CLOSED, &mddev->flags))) {
5387 printk("md: %s still in use.\n",mdname(mddev));
5388 mutex_unlock(&mddev->open_mutex);
5390 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5391 md_wakeup_thread(mddev->thread);
5397 set_disk_ro(disk, 0);
5399 __md_stop_writes(mddev);
5401 mddev->queue->merge_bvec_fn = NULL;
5402 mddev->queue->backing_dev_info.congested_fn = NULL;
5404 /* tell userspace to handle 'inactive' */
5405 sysfs_notify_dirent_safe(mddev->sysfs_state);
5407 rdev_for_each(rdev, mddev)
5408 if (rdev->raid_disk >= 0)
5409 sysfs_unlink_rdev(mddev, rdev);
5411 set_capacity(disk, 0);
5412 mutex_unlock(&mddev->open_mutex);
5414 revalidate_disk(disk);
5419 mutex_unlock(&mddev->open_mutex);
5421 * Free resources if final stop
5424 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
5426 bitmap_destroy(mddev);
5427 if (mddev->bitmap_info.file) {
5428 restore_bitmap_write_access(mddev->bitmap_info.file);
5429 fput(mddev->bitmap_info.file);
5430 mddev->bitmap_info.file = NULL;
5432 mddev->bitmap_info.offset = 0;
5434 export_array(mddev);
5437 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
5438 if (mddev->hold_active == UNTIL_STOP)
5439 mddev->hold_active = 0;
5441 blk_integrity_unregister(disk);
5442 md_new_event(mddev);
5443 sysfs_notify_dirent_safe(mddev->sysfs_state);
5448 static void autorun_array(struct mddev *mddev)
5450 struct md_rdev *rdev;
5453 if (list_empty(&mddev->disks))
5456 printk(KERN_INFO "md: running: ");
5458 rdev_for_each(rdev, mddev) {
5459 char b[BDEVNAME_SIZE];
5460 printk("<%s>", bdevname(rdev->bdev,b));
5464 err = do_md_run(mddev);
5466 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
5467 do_md_stop(mddev, 0, NULL);
5472 * lets try to run arrays based on all disks that have arrived
5473 * until now. (those are in pending_raid_disks)
5475 * the method: pick the first pending disk, collect all disks with
5476 * the same UUID, remove all from the pending list and put them into
5477 * the 'same_array' list. Then order this list based on superblock
5478 * update time (freshest comes first), kick out 'old' disks and
5479 * compare superblocks. If everything's fine then run it.
5481 * If "unit" is allocated, then bump its reference count
5483 static void autorun_devices(int part)
5485 struct md_rdev *rdev0, *rdev, *tmp;
5486 struct mddev *mddev;
5487 char b[BDEVNAME_SIZE];
5489 printk(KERN_INFO "md: autorun ...\n");
5490 while (!list_empty(&pending_raid_disks)) {
5493 LIST_HEAD(candidates);
5494 rdev0 = list_entry(pending_raid_disks.next,
5495 struct md_rdev, same_set);
5497 printk(KERN_INFO "md: considering %s ...\n",
5498 bdevname(rdev0->bdev,b));
5499 INIT_LIST_HEAD(&candidates);
5500 rdev_for_each_list(rdev, tmp, &pending_raid_disks)
5501 if (super_90_load(rdev, rdev0, 0) >= 0) {
5502 printk(KERN_INFO "md: adding %s ...\n",
5503 bdevname(rdev->bdev,b));
5504 list_move(&rdev->same_set, &candidates);
5507 * now we have a set of devices, with all of them having
5508 * mostly sane superblocks. It's time to allocate the
5512 dev = MKDEV(mdp_major,
5513 rdev0->preferred_minor << MdpMinorShift);
5514 unit = MINOR(dev) >> MdpMinorShift;
5516 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
5519 if (rdev0->preferred_minor != unit) {
5520 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
5521 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
5525 md_probe(dev, NULL, NULL);
5526 mddev = mddev_find(dev);
5527 if (!mddev || !mddev->gendisk) {
5531 "md: cannot allocate memory for md drive.\n");
5534 if (mddev_lock(mddev))
5535 printk(KERN_WARNING "md: %s locked, cannot run\n",
5537 else if (mddev->raid_disks || mddev->major_version
5538 || !list_empty(&mddev->disks)) {
5540 "md: %s already running, cannot run %s\n",
5541 mdname(mddev), bdevname(rdev0->bdev,b));
5542 mddev_unlock(mddev);
5544 printk(KERN_INFO "md: created %s\n", mdname(mddev));
5545 mddev->persistent = 1;
5546 rdev_for_each_list(rdev, tmp, &candidates) {
5547 list_del_init(&rdev->same_set);
5548 if (bind_rdev_to_array(rdev, mddev))
5551 autorun_array(mddev);
5552 mddev_unlock(mddev);
5554 /* on success, candidates will be empty, on error
5557 rdev_for_each_list(rdev, tmp, &candidates) {
5558 list_del_init(&rdev->same_set);
5563 printk(KERN_INFO "md: ... autorun DONE.\n");
5565 #endif /* !MODULE */
5567 static int get_version(void __user * arg)
5571 ver.major = MD_MAJOR_VERSION;
5572 ver.minor = MD_MINOR_VERSION;
5573 ver.patchlevel = MD_PATCHLEVEL_VERSION;
5575 if (copy_to_user(arg, &ver, sizeof(ver)))
5581 static int get_array_info(struct mddev * mddev, void __user * arg)
5583 mdu_array_info_t info;
5584 int nr,working,insync,failed,spare;
5585 struct md_rdev *rdev;
5587 nr = working = insync = failed = spare = 0;
5589 rdev_for_each_rcu(rdev, mddev) {
5591 if (test_bit(Faulty, &rdev->flags))
5595 if (test_bit(In_sync, &rdev->flags))
5603 info.major_version = mddev->major_version;
5604 info.minor_version = mddev->minor_version;
5605 info.patch_version = MD_PATCHLEVEL_VERSION;
5606 info.ctime = mddev->ctime;
5607 info.level = mddev->level;
5608 info.size = mddev->dev_sectors / 2;
5609 if (info.size != mddev->dev_sectors / 2) /* overflow */
5612 info.raid_disks = mddev->raid_disks;
5613 info.md_minor = mddev->md_minor;
5614 info.not_persistent= !mddev->persistent;
5616 info.utime = mddev->utime;
5619 info.state = (1<<MD_SB_CLEAN);
5620 if (mddev->bitmap && mddev->bitmap_info.offset)
5621 info.state = (1<<MD_SB_BITMAP_PRESENT);
5622 info.active_disks = insync;
5623 info.working_disks = working;
5624 info.failed_disks = failed;
5625 info.spare_disks = spare;
5627 info.layout = mddev->layout;
5628 info.chunk_size = mddev->chunk_sectors << 9;
5630 if (copy_to_user(arg, &info, sizeof(info)))
5636 static int get_bitmap_file(struct mddev * mddev, void __user * arg)
5638 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
5639 char *ptr, *buf = NULL;
5642 file = kmalloc(sizeof(*file), GFP_NOIO);
5647 /* bitmap disabled, zero the first byte and copy out */
5648 if (!mddev->bitmap || !mddev->bitmap->storage.file) {
5649 file->pathname[0] = '\0';
5653 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
5657 ptr = d_path(&mddev->bitmap->storage.file->f_path,
5658 buf, sizeof(file->pathname));
5662 strcpy(file->pathname, ptr);
5666 if (copy_to_user(arg, file, sizeof(*file)))
5674 static int get_disk_info(struct mddev * mddev, void __user * arg)
5676 mdu_disk_info_t info;
5677 struct md_rdev *rdev;
5679 if (copy_from_user(&info, arg, sizeof(info)))
5683 rdev = find_rdev_nr_rcu(mddev, info.number);
5685 info.major = MAJOR(rdev->bdev->bd_dev);
5686 info.minor = MINOR(rdev->bdev->bd_dev);
5687 info.raid_disk = rdev->raid_disk;
5689 if (test_bit(Faulty, &rdev->flags))
5690 info.state |= (1<<MD_DISK_FAULTY);
5691 else if (test_bit(In_sync, &rdev->flags)) {
5692 info.state |= (1<<MD_DISK_ACTIVE);
5693 info.state |= (1<<MD_DISK_SYNC);
5695 if (test_bit(WriteMostly, &rdev->flags))
5696 info.state |= (1<<MD_DISK_WRITEMOSTLY);
5698 info.major = info.minor = 0;
5699 info.raid_disk = -1;
5700 info.state = (1<<MD_DISK_REMOVED);
5704 if (copy_to_user(arg, &info, sizeof(info)))
5710 static int add_new_disk(struct mddev * mddev, mdu_disk_info_t *info)
5712 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
5713 struct md_rdev *rdev;
5714 dev_t dev = MKDEV(info->major,info->minor);
5716 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
5719 if (!mddev->raid_disks) {
5721 /* expecting a device which has a superblock */
5722 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
5725 "md: md_import_device returned %ld\n",
5727 return PTR_ERR(rdev);
5729 if (!list_empty(&mddev->disks)) {
5730 struct md_rdev *rdev0
5731 = list_entry(mddev->disks.next,
5732 struct md_rdev, same_set);
5733 err = super_types[mddev->major_version]
5734 .load_super(rdev, rdev0, mddev->minor_version);
5737 "md: %s has different UUID to %s\n",
5738 bdevname(rdev->bdev,b),
5739 bdevname(rdev0->bdev,b2));
5744 err = bind_rdev_to_array(rdev, mddev);
5751 * add_new_disk can be used once the array is assembled
5752 * to add "hot spares". They must already have a superblock
5757 if (!mddev->pers->hot_add_disk) {
5759 "%s: personality does not support diskops!\n",
5763 if (mddev->persistent)
5764 rdev = md_import_device(dev, mddev->major_version,
5765 mddev->minor_version);
5767 rdev = md_import_device(dev, -1, -1);
5770 "md: md_import_device returned %ld\n",
5772 return PTR_ERR(rdev);
5774 /* set saved_raid_disk if appropriate */
5775 if (!mddev->persistent) {
5776 if (info->state & (1<<MD_DISK_SYNC) &&
5777 info->raid_disk < mddev->raid_disks) {
5778 rdev->raid_disk = info->raid_disk;
5779 set_bit(In_sync, &rdev->flags);
5780 clear_bit(Bitmap_sync, &rdev->flags);
5782 rdev->raid_disk = -1;
5784 super_types[mddev->major_version].
5785 validate_super(mddev, rdev);
5786 if ((info->state & (1<<MD_DISK_SYNC)) &&
5787 rdev->raid_disk != info->raid_disk) {
5788 /* This was a hot-add request, but events doesn't
5789 * match, so reject it.
5795 if (test_bit(In_sync, &rdev->flags))
5796 rdev->saved_raid_disk = rdev->raid_disk;
5798 rdev->saved_raid_disk = -1;
5800 clear_bit(In_sync, &rdev->flags); /* just to be sure */
5801 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
5802 set_bit(WriteMostly, &rdev->flags);
5804 clear_bit(WriteMostly, &rdev->flags);
5806 rdev->raid_disk = -1;
5807 err = bind_rdev_to_array(rdev, mddev);
5808 if (!err && !mddev->pers->hot_remove_disk) {
5809 /* If there is hot_add_disk but no hot_remove_disk
5810 * then added disks for geometry changes,
5811 * and should be added immediately.
5813 super_types[mddev->major_version].
5814 validate_super(mddev, rdev);
5815 err = mddev->pers->hot_add_disk(mddev, rdev);
5817 unbind_rdev_from_array(rdev);
5822 sysfs_notify_dirent_safe(rdev->sysfs_state);
5824 set_bit(MD_CHANGE_DEVS, &mddev->flags);
5825 if (mddev->degraded)
5826 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
5827 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5829 md_new_event(mddev);
5830 md_wakeup_thread(mddev->thread);
5834 /* otherwise, add_new_disk is only allowed
5835 * for major_version==0 superblocks
5837 if (mddev->major_version != 0) {
5838 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
5843 if (!(info->state & (1<<MD_DISK_FAULTY))) {
5845 rdev = md_import_device(dev, -1, 0);
5848 "md: error, md_import_device() returned %ld\n",
5850 return PTR_ERR(rdev);
5852 rdev->desc_nr = info->number;
5853 if (info->raid_disk < mddev->raid_disks)
5854 rdev->raid_disk = info->raid_disk;
5856 rdev->raid_disk = -1;
5858 if (rdev->raid_disk < mddev->raid_disks)
5859 if (info->state & (1<<MD_DISK_SYNC))
5860 set_bit(In_sync, &rdev->flags);
5862 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
5863 set_bit(WriteMostly, &rdev->flags);
5865 if (!mddev->persistent) {
5866 printk(KERN_INFO "md: nonpersistent superblock ...\n");
5867 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
5869 rdev->sb_start = calc_dev_sboffset(rdev);
5870 rdev->sectors = rdev->sb_start;
5872 err = bind_rdev_to_array(rdev, mddev);
5882 static int hot_remove_disk(struct mddev * mddev, dev_t dev)
5884 char b[BDEVNAME_SIZE];
5885 struct md_rdev *rdev;
5887 rdev = find_rdev(mddev, dev);
5891 clear_bit(Blocked, &rdev->flags);
5892 remove_and_add_spares(mddev, rdev);
5894 if (rdev->raid_disk >= 0)
5897 kick_rdev_from_array(rdev);
5898 md_update_sb(mddev, 1);
5899 md_new_event(mddev);
5903 printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n",
5904 bdevname(rdev->bdev,b), mdname(mddev));
5908 static int hot_add_disk(struct mddev * mddev, dev_t dev)
5910 char b[BDEVNAME_SIZE];
5912 struct md_rdev *rdev;
5917 if (mddev->major_version != 0) {
5918 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
5919 " version-0 superblocks.\n",
5923 if (!mddev->pers->hot_add_disk) {
5925 "%s: personality does not support diskops!\n",
5930 rdev = md_import_device(dev, -1, 0);
5933 "md: error, md_import_device() returned %ld\n",
5938 if (mddev->persistent)
5939 rdev->sb_start = calc_dev_sboffset(rdev);
5941 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
5943 rdev->sectors = rdev->sb_start;
5945 if (test_bit(Faulty, &rdev->flags)) {
5947 "md: can not hot-add faulty %s disk to %s!\n",
5948 bdevname(rdev->bdev,b), mdname(mddev));
5952 clear_bit(In_sync, &rdev->flags);
5954 rdev->saved_raid_disk = -1;
5955 err = bind_rdev_to_array(rdev, mddev);
5960 * The rest should better be atomic, we can have disk failures
5961 * noticed in interrupt contexts ...
5964 rdev->raid_disk = -1;
5966 md_update_sb(mddev, 1);
5969 * Kick recovery, maybe this spare has to be added to the
5970 * array immediately.
5972 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5973 md_wakeup_thread(mddev->thread);
5974 md_new_event(mddev);
5982 static int set_bitmap_file(struct mddev *mddev, int fd)
5987 if (!mddev->pers->quiesce)
5989 if (mddev->recovery || mddev->sync_thread)
5991 /* we should be able to change the bitmap.. */
5997 return -EEXIST; /* cannot add when bitmap is present */
5998 mddev->bitmap_info.file = fget(fd);
6000 if (mddev->bitmap_info.file == NULL) {
6001 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
6006 err = deny_bitmap_write_access(mddev->bitmap_info.file);
6008 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
6010 fput(mddev->bitmap_info.file);
6011 mddev->bitmap_info.file = NULL;
6014 mddev->bitmap_info.offset = 0; /* file overrides offset */
6015 } else if (mddev->bitmap == NULL)
6016 return -ENOENT; /* cannot remove what isn't there */
6019 mddev->pers->quiesce(mddev, 1);
6021 err = bitmap_create(mddev);
6023 err = bitmap_load(mddev);
6025 if (fd < 0 || err) {
6026 bitmap_destroy(mddev);
6027 fd = -1; /* make sure to put the file */
6029 mddev->pers->quiesce(mddev, 0);
6032 if (mddev->bitmap_info.file) {
6033 restore_bitmap_write_access(mddev->bitmap_info.file);
6034 fput(mddev->bitmap_info.file);
6036 mddev->bitmap_info.file = NULL;
6043 * set_array_info is used two different ways
6044 * The original usage is when creating a new array.
6045 * In this usage, raid_disks is > 0 and it together with
6046 * level, size, not_persistent,layout,chunksize determine the
6047 * shape of the array.
6048 * This will always create an array with a type-0.90.0 superblock.
6049 * The newer usage is when assembling an array.
6050 * In this case raid_disks will be 0, and the major_version field is
6051 * use to determine which style super-blocks are to be found on the devices.
6052 * The minor and patch _version numbers are also kept incase the
6053 * super_block handler wishes to interpret them.
6055 static int set_array_info(struct mddev * mddev, mdu_array_info_t *info)
6058 if (info->raid_disks == 0) {
6059 /* just setting version number for superblock loading */
6060 if (info->major_version < 0 ||
6061 info->major_version >= ARRAY_SIZE(super_types) ||
6062 super_types[info->major_version].name == NULL) {
6063 /* maybe try to auto-load a module? */
6065 "md: superblock version %d not known\n",
6066 info->major_version);
6069 mddev->major_version = info->major_version;
6070 mddev->minor_version = info->minor_version;
6071 mddev->patch_version = info->patch_version;
6072 mddev->persistent = !info->not_persistent;
6073 /* ensure mddev_put doesn't delete this now that there
6074 * is some minimal configuration.
6076 mddev->ctime = get_seconds();
6079 mddev->major_version = MD_MAJOR_VERSION;
6080 mddev->minor_version = MD_MINOR_VERSION;
6081 mddev->patch_version = MD_PATCHLEVEL_VERSION;
6082 mddev->ctime = get_seconds();
6084 mddev->level = info->level;
6085 mddev->clevel[0] = 0;
6086 mddev->dev_sectors = 2 * (sector_t)info->size;
6087 mddev->raid_disks = info->raid_disks;
6088 /* don't set md_minor, it is determined by which /dev/md* was
6091 if (info->state & (1<<MD_SB_CLEAN))
6092 mddev->recovery_cp = MaxSector;
6094 mddev->recovery_cp = 0;
6095 mddev->persistent = ! info->not_persistent;
6096 mddev->external = 0;
6098 mddev->layout = info->layout;
6099 mddev->chunk_sectors = info->chunk_size >> 9;
6101 mddev->max_disks = MD_SB_DISKS;
6103 if (mddev->persistent)
6105 set_bit(MD_CHANGE_DEVS, &mddev->flags);
6107 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
6108 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
6109 mddev->bitmap_info.offset = 0;
6111 mddev->reshape_position = MaxSector;
6114 * Generate a 128 bit UUID
6116 get_random_bytes(mddev->uuid, 16);
6118 mddev->new_level = mddev->level;
6119 mddev->new_chunk_sectors = mddev->chunk_sectors;
6120 mddev->new_layout = mddev->layout;
6121 mddev->delta_disks = 0;
6122 mddev->reshape_backwards = 0;
6127 void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors)
6129 WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__);
6131 if (mddev->external_size)
6134 mddev->array_sectors = array_sectors;
6136 EXPORT_SYMBOL(md_set_array_sectors);
6138 static int update_size(struct mddev *mddev, sector_t num_sectors)
6140 struct md_rdev *rdev;
6142 int fit = (num_sectors == 0);
6144 if (mddev->pers->resize == NULL)
6146 /* The "num_sectors" is the number of sectors of each device that
6147 * is used. This can only make sense for arrays with redundancy.
6148 * linear and raid0 always use whatever space is available. We can only
6149 * consider changing this number if no resync or reconstruction is
6150 * happening, and if the new size is acceptable. It must fit before the
6151 * sb_start or, if that is <data_offset, it must fit before the size
6152 * of each device. If num_sectors is zero, we find the largest size
6155 if (mddev->sync_thread)
6158 rdev_for_each(rdev, mddev) {
6159 sector_t avail = rdev->sectors;
6161 if (fit && (num_sectors == 0 || num_sectors > avail))
6162 num_sectors = avail;
6163 if (avail < num_sectors)
6166 rv = mddev->pers->resize(mddev, num_sectors);
6168 revalidate_disk(mddev->gendisk);
6172 static int update_raid_disks(struct mddev *mddev, int raid_disks)
6175 struct md_rdev *rdev;
6176 /* change the number of raid disks */
6177 if (mddev->pers->check_reshape == NULL)
6179 if (raid_disks <= 0 ||
6180 (mddev->max_disks && raid_disks >= mddev->max_disks))
6182 if (mddev->sync_thread || mddev->reshape_position != MaxSector)
6185 rdev_for_each(rdev, mddev) {
6186 if (mddev->raid_disks < raid_disks &&
6187 rdev->data_offset < rdev->new_data_offset)
6189 if (mddev->raid_disks > raid_disks &&
6190 rdev->data_offset > rdev->new_data_offset)
6194 mddev->delta_disks = raid_disks - mddev->raid_disks;
6195 if (mddev->delta_disks < 0)
6196 mddev->reshape_backwards = 1;
6197 else if (mddev->delta_disks > 0)
6198 mddev->reshape_backwards = 0;
6200 rv = mddev->pers->check_reshape(mddev);
6202 mddev->delta_disks = 0;
6203 mddev->reshape_backwards = 0;
6210 * update_array_info is used to change the configuration of an
6212 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
6213 * fields in the info are checked against the array.
6214 * Any differences that cannot be handled will cause an error.
6215 * Normally, only one change can be managed at a time.
6217 static int update_array_info(struct mddev *mddev, mdu_array_info_t *info)
6223 /* calculate expected state,ignoring low bits */
6224 if (mddev->bitmap && mddev->bitmap_info.offset)
6225 state |= (1 << MD_SB_BITMAP_PRESENT);
6227 if (mddev->major_version != info->major_version ||
6228 mddev->minor_version != info->minor_version ||
6229 /* mddev->patch_version != info->patch_version || */
6230 mddev->ctime != info->ctime ||
6231 mddev->level != info->level ||
6232 /* mddev->layout != info->layout || */
6233 !mddev->persistent != info->not_persistent||
6234 mddev->chunk_sectors != info->chunk_size >> 9 ||
6235 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
6236 ((state^info->state) & 0xfffffe00)
6239 /* Check there is only one change */
6240 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
6242 if (mddev->raid_disks != info->raid_disks)
6244 if (mddev->layout != info->layout)
6246 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT))
6253 if (mddev->layout != info->layout) {
6255 * we don't need to do anything at the md level, the
6256 * personality will take care of it all.
6258 if (mddev->pers->check_reshape == NULL)
6261 mddev->new_layout = info->layout;
6262 rv = mddev->pers->check_reshape(mddev);
6264 mddev->new_layout = mddev->layout;
6268 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
6269 rv = update_size(mddev, (sector_t)info->size * 2);
6271 if (mddev->raid_disks != info->raid_disks)
6272 rv = update_raid_disks(mddev, info->raid_disks);
6274 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
6275 if (mddev->pers->quiesce == NULL)
6277 if (mddev->recovery || mddev->sync_thread)
6279 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
6280 /* add the bitmap */
6283 if (mddev->bitmap_info.default_offset == 0)
6285 mddev->bitmap_info.offset =
6286 mddev->bitmap_info.default_offset;
6287 mddev->bitmap_info.space =
6288 mddev->bitmap_info.default_space;
6289 mddev->pers->quiesce(mddev, 1);
6290 rv = bitmap_create(mddev);
6292 rv = bitmap_load(mddev);
6294 bitmap_destroy(mddev);
6295 mddev->pers->quiesce(mddev, 0);
6297 /* remove the bitmap */
6300 if (mddev->bitmap->storage.file)
6302 mddev->pers->quiesce(mddev, 1);
6303 bitmap_destroy(mddev);
6304 mddev->pers->quiesce(mddev, 0);
6305 mddev->bitmap_info.offset = 0;
6308 md_update_sb(mddev, 1);
6312 static int set_disk_faulty(struct mddev *mddev, dev_t dev)
6314 struct md_rdev *rdev;
6317 if (mddev->pers == NULL)
6321 rdev = find_rdev_rcu(mddev, dev);
6325 md_error(mddev, rdev);
6326 if (!test_bit(Faulty, &rdev->flags))
6334 * We have a problem here : there is no easy way to give a CHS
6335 * virtual geometry. We currently pretend that we have a 2 heads
6336 * 4 sectors (with a BIG number of cylinders...). This drives
6337 * dosfs just mad... ;-)
6339 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
6341 struct mddev *mddev = bdev->bd_disk->private_data;
6345 geo->cylinders = mddev->array_sectors / 8;
6349 static int md_ioctl(struct block_device *bdev, fmode_t mode,
6350 unsigned int cmd, unsigned long arg)
6353 void __user *argp = (void __user *)arg;
6354 struct mddev *mddev = NULL;
6359 case GET_ARRAY_INFO:
6363 if (!capable(CAP_SYS_ADMIN))
6368 * Commands dealing with the RAID driver but not any
6373 err = get_version(argp);
6376 case PRINT_RAID_DEBUG:
6384 autostart_arrays(arg);
6391 * Commands creating/starting a new array:
6394 mddev = bdev->bd_disk->private_data;
6401 /* Some actions do not requires the mutex */
6403 case GET_ARRAY_INFO:
6404 if (!mddev->raid_disks && !mddev->external)
6407 err = get_array_info(mddev, argp);
6411 if (!mddev->raid_disks && !mddev->external)
6414 err = get_disk_info(mddev, argp);
6417 case SET_DISK_FAULTY:
6418 err = set_disk_faulty(mddev, new_decode_dev(arg));
6422 if (cmd == ADD_NEW_DISK)
6423 /* need to ensure md_delayed_delete() has completed */
6424 flush_workqueue(md_misc_wq);
6426 if (cmd == HOT_REMOVE_DISK)
6427 /* need to ensure recovery thread has run */
6428 wait_event_interruptible_timeout(mddev->sb_wait,
6429 !test_bit(MD_RECOVERY_NEEDED,
6431 msecs_to_jiffies(5000));
6432 if (cmd == STOP_ARRAY || cmd == STOP_ARRAY_RO) {
6433 /* Need to flush page cache, and ensure no-one else opens
6436 mutex_lock(&mddev->open_mutex);
6437 if (atomic_read(&mddev->openers) > 1) {
6438 mutex_unlock(&mddev->open_mutex);
6442 set_bit(MD_STILL_CLOSED, &mddev->flags);
6443 mutex_unlock(&mddev->open_mutex);
6444 sync_blockdev(bdev);
6446 err = mddev_lock(mddev);
6449 "md: ioctl lock interrupted, reason %d, cmd %d\n",
6454 if (cmd == SET_ARRAY_INFO) {
6455 mdu_array_info_t info;
6457 memset(&info, 0, sizeof(info));
6458 else if (copy_from_user(&info, argp, sizeof(info))) {
6463 err = update_array_info(mddev, &info);
6465 printk(KERN_WARNING "md: couldn't update"
6466 " array info. %d\n", err);
6471 if (!list_empty(&mddev->disks)) {
6473 "md: array %s already has disks!\n",
6478 if (mddev->raid_disks) {
6480 "md: array %s already initialised!\n",
6485 err = set_array_info(mddev, &info);
6487 printk(KERN_WARNING "md: couldn't set"
6488 " array info. %d\n", err);
6495 * Commands querying/configuring an existing array:
6497 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
6498 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
6499 if ((!mddev->raid_disks && !mddev->external)
6500 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
6501 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
6502 && cmd != GET_BITMAP_FILE) {
6508 * Commands even a read-only array can execute:
6511 case GET_BITMAP_FILE:
6512 err = get_bitmap_file(mddev, argp);
6515 case RESTART_ARRAY_RW:
6516 err = restart_array(mddev);
6520 err = do_md_stop(mddev, 0, bdev);
6524 err = md_set_readonly(mddev, bdev);
6527 case HOT_REMOVE_DISK:
6528 err = hot_remove_disk(mddev, new_decode_dev(arg));
6532 /* We can support ADD_NEW_DISK on read-only arrays
6533 * on if we are re-adding a preexisting device.
6534 * So require mddev->pers and MD_DISK_SYNC.
6537 mdu_disk_info_t info;
6538 if (copy_from_user(&info, argp, sizeof(info)))
6540 else if (!(info.state & (1<<MD_DISK_SYNC)))
6541 /* Need to clear read-only for this */
6544 err = add_new_disk(mddev, &info);
6550 if (get_user(ro, (int __user *)(arg))) {
6556 /* if the bdev is going readonly the value of mddev->ro
6557 * does not matter, no writes are coming
6562 /* are we are already prepared for writes? */
6566 /* transitioning to readauto need only happen for
6567 * arrays that call md_write_start
6570 err = restart_array(mddev);
6573 set_disk_ro(mddev->gendisk, 0);
6580 * The remaining ioctls are changing the state of the
6581 * superblock, so we do not allow them on read-only arrays.
6582 * However non-MD ioctls (e.g. get-size) will still come through
6583 * here and hit the 'default' below, so only disallow
6584 * 'md' ioctls, and switch to rw mode if started auto-readonly.
6586 if (_IOC_TYPE(cmd) == MD_MAJOR && mddev->ro && mddev->pers) {
6587 if (mddev->ro == 2) {
6589 sysfs_notify_dirent_safe(mddev->sysfs_state);
6590 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6591 /* mddev_unlock will wake thread */
6592 /* If a device failed while we were read-only, we
6593 * need to make sure the metadata is updated now.
6595 if (test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
6596 mddev_unlock(mddev);
6597 wait_event(mddev->sb_wait,
6598 !test_bit(MD_CHANGE_DEVS, &mddev->flags) &&
6599 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
6600 mddev_lock_nointr(mddev);
6611 mdu_disk_info_t info;
6612 if (copy_from_user(&info, argp, sizeof(info)))
6615 err = add_new_disk(mddev, &info);
6620 err = hot_add_disk(mddev, new_decode_dev(arg));
6624 err = do_md_run(mddev);
6627 case SET_BITMAP_FILE:
6628 err = set_bitmap_file(mddev, (int)arg);
6638 if (mddev->hold_active == UNTIL_IOCTL &&
6640 mddev->hold_active = 0;
6641 mddev_unlock(mddev);
6650 #ifdef CONFIG_COMPAT
6651 static int md_compat_ioctl(struct block_device *bdev, fmode_t mode,
6652 unsigned int cmd, unsigned long arg)
6655 case HOT_REMOVE_DISK:
6657 case SET_DISK_FAULTY:
6658 case SET_BITMAP_FILE:
6659 /* These take in integer arg, do not convert */
6662 arg = (unsigned long)compat_ptr(arg);
6666 return md_ioctl(bdev, mode, cmd, arg);
6668 #endif /* CONFIG_COMPAT */
6670 static int md_open(struct block_device *bdev, fmode_t mode)
6673 * Succeed if we can lock the mddev, which confirms that
6674 * it isn't being stopped right now.
6676 struct mddev *mddev = mddev_find(bdev->bd_dev);
6682 if (mddev->gendisk != bdev->bd_disk) {
6683 /* we are racing with mddev_put which is discarding this
6687 /* Wait until bdev->bd_disk is definitely gone */
6688 flush_workqueue(md_misc_wq);
6689 /* Then retry the open from the top */
6690 return -ERESTARTSYS;
6692 BUG_ON(mddev != bdev->bd_disk->private_data);
6694 if ((err = mutex_lock_interruptible(&mddev->open_mutex)))
6698 atomic_inc(&mddev->openers);
6699 clear_bit(MD_STILL_CLOSED, &mddev->flags);
6700 mutex_unlock(&mddev->open_mutex);
6702 check_disk_change(bdev);
6707 static void md_release(struct gendisk *disk, fmode_t mode)
6709 struct mddev *mddev = disk->private_data;
6712 atomic_dec(&mddev->openers);
6716 static int md_media_changed(struct gendisk *disk)
6718 struct mddev *mddev = disk->private_data;
6720 return mddev->changed;
6723 static int md_revalidate(struct gendisk *disk)
6725 struct mddev *mddev = disk->private_data;
6730 static const struct block_device_operations md_fops =
6732 .owner = THIS_MODULE,
6734 .release = md_release,
6736 #ifdef CONFIG_COMPAT
6737 .compat_ioctl = md_compat_ioctl,
6739 .getgeo = md_getgeo,
6740 .media_changed = md_media_changed,
6741 .revalidate_disk= md_revalidate,
6744 static int md_thread(void * arg)
6746 struct md_thread *thread = arg;
6749 * md_thread is a 'system-thread', it's priority should be very
6750 * high. We avoid resource deadlocks individually in each
6751 * raid personality. (RAID5 does preallocation) We also use RR and
6752 * the very same RT priority as kswapd, thus we will never get
6753 * into a priority inversion deadlock.
6755 * we definitely have to have equal or higher priority than
6756 * bdflush, otherwise bdflush will deadlock if there are too
6757 * many dirty RAID5 blocks.
6760 allow_signal(SIGKILL);
6761 while (!kthread_should_stop()) {
6763 /* We need to wait INTERRUPTIBLE so that
6764 * we don't add to the load-average.
6765 * That means we need to be sure no signals are
6768 if (signal_pending(current))
6769 flush_signals(current);
6771 wait_event_interruptible_timeout
6773 test_bit(THREAD_WAKEUP, &thread->flags)
6774 || kthread_should_stop(),
6777 clear_bit(THREAD_WAKEUP, &thread->flags);
6778 if (!kthread_should_stop())
6779 thread->run(thread);
6785 void md_wakeup_thread(struct md_thread *thread)
6788 pr_debug("md: waking up MD thread %s.\n", thread->tsk->comm);
6789 set_bit(THREAD_WAKEUP, &thread->flags);
6790 wake_up(&thread->wqueue);
6794 struct md_thread *md_register_thread(void (*run) (struct md_thread *),
6795 struct mddev *mddev, const char *name)
6797 struct md_thread *thread;
6799 thread = kzalloc(sizeof(struct md_thread), GFP_KERNEL);
6803 init_waitqueue_head(&thread->wqueue);
6806 thread->mddev = mddev;
6807 thread->timeout = MAX_SCHEDULE_TIMEOUT;
6808 thread->tsk = kthread_run(md_thread, thread,
6810 mdname(thread->mddev),
6812 if (IS_ERR(thread->tsk)) {
6819 void md_unregister_thread(struct md_thread **threadp)
6821 struct md_thread *thread = *threadp;
6824 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
6825 /* Locking ensures that mddev_unlock does not wake_up a
6826 * non-existent thread
6828 spin_lock(&pers_lock);
6830 spin_unlock(&pers_lock);
6832 kthread_stop(thread->tsk);
6836 void md_error(struct mddev *mddev, struct md_rdev *rdev)
6843 if (!rdev || test_bit(Faulty, &rdev->flags))
6846 if (!mddev->pers || !mddev->pers->error_handler)
6848 mddev->pers->error_handler(mddev,rdev);
6849 if (mddev->degraded)
6850 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6851 sysfs_notify_dirent_safe(rdev->sysfs_state);
6852 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6853 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6854 md_wakeup_thread(mddev->thread);
6855 if (mddev->event_work.func)
6856 queue_work(md_misc_wq, &mddev->event_work);
6857 md_new_event_inintr(mddev);
6860 /* seq_file implementation /proc/mdstat */
6862 static void status_unused(struct seq_file *seq)
6865 struct md_rdev *rdev;
6867 seq_printf(seq, "unused devices: ");
6869 list_for_each_entry(rdev, &pending_raid_disks, same_set) {
6870 char b[BDEVNAME_SIZE];
6872 seq_printf(seq, "%s ",
6873 bdevname(rdev->bdev,b));
6876 seq_printf(seq, "<none>");
6878 seq_printf(seq, "\n");
6882 static void status_resync(struct seq_file *seq, struct mddev * mddev)
6884 sector_t max_sectors, resync, res;
6885 unsigned long dt, db;
6888 unsigned int per_milli;
6890 if (mddev->curr_resync <= 3)
6893 resync = mddev->curr_resync
6894 - atomic_read(&mddev->recovery_active);
6896 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
6897 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
6898 max_sectors = mddev->resync_max_sectors;
6900 max_sectors = mddev->dev_sectors;
6903 * Should not happen.
6909 /* Pick 'scale' such that (resync>>scale)*1000 will fit
6910 * in a sector_t, and (max_sectors>>scale) will fit in a
6911 * u32, as those are the requirements for sector_div.
6912 * Thus 'scale' must be at least 10
6915 if (sizeof(sector_t) > sizeof(unsigned long)) {
6916 while ( max_sectors/2 > (1ULL<<(scale+32)))
6919 res = (resync>>scale)*1000;
6920 sector_div(res, (u32)((max_sectors>>scale)+1));
6924 int i, x = per_milli/50, y = 20-x;
6925 seq_printf(seq, "[");
6926 for (i = 0; i < x; i++)
6927 seq_printf(seq, "=");
6928 seq_printf(seq, ">");
6929 for (i = 0; i < y; i++)
6930 seq_printf(seq, ".");
6931 seq_printf(seq, "] ");
6933 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
6934 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
6936 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
6938 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
6939 "resync" : "recovery"))),
6940 per_milli/10, per_milli % 10,
6941 (unsigned long long) resync/2,
6942 (unsigned long long) max_sectors/2);
6945 * dt: time from mark until now
6946 * db: blocks written from mark until now
6947 * rt: remaining time
6949 * rt is a sector_t, so could be 32bit or 64bit.
6950 * So we divide before multiply in case it is 32bit and close
6952 * We scale the divisor (db) by 32 to avoid losing precision
6953 * near the end of resync when the number of remaining sectors
6955 * We then divide rt by 32 after multiplying by db to compensate.
6956 * The '+1' avoids division by zero if db is very small.
6958 dt = ((jiffies - mddev->resync_mark) / HZ);
6960 db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active))
6961 - mddev->resync_mark_cnt;
6963 rt = max_sectors - resync; /* number of remaining sectors */
6964 sector_div(rt, db/32+1);
6968 seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60,
6969 ((unsigned long)rt % 60)/6);
6971 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
6974 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
6976 struct list_head *tmp;
6978 struct mddev *mddev;
6986 spin_lock(&all_mddevs_lock);
6987 list_for_each(tmp,&all_mddevs)
6989 mddev = list_entry(tmp, struct mddev, all_mddevs);
6991 spin_unlock(&all_mddevs_lock);
6994 spin_unlock(&all_mddevs_lock);
6996 return (void*)2;/* tail */
7000 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
7002 struct list_head *tmp;
7003 struct mddev *next_mddev, *mddev = v;
7009 spin_lock(&all_mddevs_lock);
7011 tmp = all_mddevs.next;
7013 tmp = mddev->all_mddevs.next;
7014 if (tmp != &all_mddevs)
7015 next_mddev = mddev_get(list_entry(tmp,struct mddev,all_mddevs));
7017 next_mddev = (void*)2;
7020 spin_unlock(&all_mddevs_lock);
7028 static void md_seq_stop(struct seq_file *seq, void *v)
7030 struct mddev *mddev = v;
7032 if (mddev && v != (void*)1 && v != (void*)2)
7036 static int md_seq_show(struct seq_file *seq, void *v)
7038 struct mddev *mddev = v;
7040 struct md_rdev *rdev;
7042 if (v == (void*)1) {
7043 struct md_personality *pers;
7044 seq_printf(seq, "Personalities : ");
7045 spin_lock(&pers_lock);
7046 list_for_each_entry(pers, &pers_list, list)
7047 seq_printf(seq, "[%s] ", pers->name);
7049 spin_unlock(&pers_lock);
7050 seq_printf(seq, "\n");
7051 seq->poll_event = atomic_read(&md_event_count);
7054 if (v == (void*)2) {
7059 if (mddev_lock(mddev) < 0)
7062 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
7063 seq_printf(seq, "%s : %sactive", mdname(mddev),
7064 mddev->pers ? "" : "in");
7067 seq_printf(seq, " (read-only)");
7069 seq_printf(seq, " (auto-read-only)");
7070 seq_printf(seq, " %s", mddev->pers->name);
7074 rdev_for_each(rdev, mddev) {
7075 char b[BDEVNAME_SIZE];
7076 seq_printf(seq, " %s[%d]",
7077 bdevname(rdev->bdev,b), rdev->desc_nr);
7078 if (test_bit(WriteMostly, &rdev->flags))
7079 seq_printf(seq, "(W)");
7080 if (test_bit(Faulty, &rdev->flags)) {
7081 seq_printf(seq, "(F)");
7084 if (rdev->raid_disk < 0)
7085 seq_printf(seq, "(S)"); /* spare */
7086 if (test_bit(Replacement, &rdev->flags))
7087 seq_printf(seq, "(R)");
7088 sectors += rdev->sectors;
7091 if (!list_empty(&mddev->disks)) {
7093 seq_printf(seq, "\n %llu blocks",
7094 (unsigned long long)
7095 mddev->array_sectors / 2);
7097 seq_printf(seq, "\n %llu blocks",
7098 (unsigned long long)sectors / 2);
7100 if (mddev->persistent) {
7101 if (mddev->major_version != 0 ||
7102 mddev->minor_version != 90) {
7103 seq_printf(seq," super %d.%d",
7104 mddev->major_version,
7105 mddev->minor_version);
7107 } else if (mddev->external)
7108 seq_printf(seq, " super external:%s",
7109 mddev->metadata_type);
7111 seq_printf(seq, " super non-persistent");
7114 mddev->pers->status(seq, mddev);
7115 seq_printf(seq, "\n ");
7116 if (mddev->pers->sync_request) {
7117 if (mddev->curr_resync > 2) {
7118 status_resync(seq, mddev);
7119 seq_printf(seq, "\n ");
7120 } else if (mddev->curr_resync >= 1)
7121 seq_printf(seq, "\tresync=DELAYED\n ");
7122 else if (mddev->recovery_cp < MaxSector)
7123 seq_printf(seq, "\tresync=PENDING\n ");
7126 seq_printf(seq, "\n ");
7128 bitmap_status(seq, mddev->bitmap);
7130 seq_printf(seq, "\n");
7132 mddev_unlock(mddev);
7137 static const struct seq_operations md_seq_ops = {
7138 .start = md_seq_start,
7139 .next = md_seq_next,
7140 .stop = md_seq_stop,
7141 .show = md_seq_show,
7144 static int md_seq_open(struct inode *inode, struct file *file)
7146 struct seq_file *seq;
7149 error = seq_open(file, &md_seq_ops);
7153 seq = file->private_data;
7154 seq->poll_event = atomic_read(&md_event_count);
7158 static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
7160 struct seq_file *seq = filp->private_data;
7163 poll_wait(filp, &md_event_waiters, wait);
7165 /* always allow read */
7166 mask = POLLIN | POLLRDNORM;
7168 if (seq->poll_event != atomic_read(&md_event_count))
7169 mask |= POLLERR | POLLPRI;
7173 static const struct file_operations md_seq_fops = {
7174 .owner = THIS_MODULE,
7175 .open = md_seq_open,
7177 .llseek = seq_lseek,
7178 .release = seq_release_private,
7179 .poll = mdstat_poll,
7182 int register_md_personality(struct md_personality *p)
7184 spin_lock(&pers_lock);
7185 list_add_tail(&p->list, &pers_list);
7186 printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level);
7187 spin_unlock(&pers_lock);
7191 int unregister_md_personality(struct md_personality *p)
7193 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
7194 spin_lock(&pers_lock);
7195 list_del_init(&p->list);
7196 spin_unlock(&pers_lock);
7200 static int is_mddev_idle(struct mddev *mddev, int init)
7202 struct md_rdev * rdev;
7208 rdev_for_each_rcu(rdev, mddev) {
7209 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
7210 curr_events = (int)part_stat_read(&disk->part0, sectors[0]) +
7211 (int)part_stat_read(&disk->part0, sectors[1]) -
7212 atomic_read(&disk->sync_io);
7213 /* sync IO will cause sync_io to increase before the disk_stats
7214 * as sync_io is counted when a request starts, and
7215 * disk_stats is counted when it completes.
7216 * So resync activity will cause curr_events to be smaller than
7217 * when there was no such activity.
7218 * non-sync IO will cause disk_stat to increase without
7219 * increasing sync_io so curr_events will (eventually)
7220 * be larger than it was before. Once it becomes
7221 * substantially larger, the test below will cause
7222 * the array to appear non-idle, and resync will slow
7224 * If there is a lot of outstanding resync activity when
7225 * we set last_event to curr_events, then all that activity
7226 * completing might cause the array to appear non-idle
7227 * and resync will be slowed down even though there might
7228 * not have been non-resync activity. This will only
7229 * happen once though. 'last_events' will soon reflect
7230 * the state where there is little or no outstanding
7231 * resync requests, and further resync activity will
7232 * always make curr_events less than last_events.
7235 if (init || curr_events - rdev->last_events > 64) {
7236 rdev->last_events = curr_events;
7244 void md_done_sync(struct mddev *mddev, int blocks, int ok)
7246 /* another "blocks" (512byte) blocks have been synced */
7247 atomic_sub(blocks, &mddev->recovery_active);
7248 wake_up(&mddev->recovery_wait);
7250 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7251 set_bit(MD_RECOVERY_ERROR, &mddev->recovery);
7252 md_wakeup_thread(mddev->thread);
7253 // stop recovery, signal do_sync ....
7258 /* md_write_start(mddev, bi)
7259 * If we need to update some array metadata (e.g. 'active' flag
7260 * in superblock) before writing, schedule a superblock update
7261 * and wait for it to complete.
7263 void md_write_start(struct mddev *mddev, struct bio *bi)
7266 if (bio_data_dir(bi) != WRITE)
7269 BUG_ON(mddev->ro == 1);
7270 if (mddev->ro == 2) {
7271 /* need to switch to read/write */
7273 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7274 md_wakeup_thread(mddev->thread);
7275 md_wakeup_thread(mddev->sync_thread);
7278 atomic_inc(&mddev->writes_pending);
7279 if (mddev->safemode == 1)
7280 mddev->safemode = 0;
7281 if (mddev->in_sync) {
7282 spin_lock_irq(&mddev->write_lock);
7283 if (mddev->in_sync) {
7285 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
7286 set_bit(MD_CHANGE_PENDING, &mddev->flags);
7287 md_wakeup_thread(mddev->thread);
7290 spin_unlock_irq(&mddev->write_lock);
7293 sysfs_notify_dirent_safe(mddev->sysfs_state);
7294 wait_event(mddev->sb_wait,
7295 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
7298 void md_write_end(struct mddev *mddev)
7300 if (atomic_dec_and_test(&mddev->writes_pending)) {
7301 if (mddev->safemode == 2)
7302 md_wakeup_thread(mddev->thread);
7303 else if (mddev->safemode_delay)
7304 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
7308 /* md_allow_write(mddev)
7309 * Calling this ensures that the array is marked 'active' so that writes
7310 * may proceed without blocking. It is important to call this before
7311 * attempting a GFP_KERNEL allocation while holding the mddev lock.
7312 * Must be called with mddev_lock held.
7314 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
7315 * is dropped, so return -EAGAIN after notifying userspace.
7317 int md_allow_write(struct mddev *mddev)
7323 if (!mddev->pers->sync_request)
7326 spin_lock_irq(&mddev->write_lock);
7327 if (mddev->in_sync) {
7329 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
7330 set_bit(MD_CHANGE_PENDING, &mddev->flags);
7331 if (mddev->safemode_delay &&
7332 mddev->safemode == 0)
7333 mddev->safemode = 1;
7334 spin_unlock_irq(&mddev->write_lock);
7335 md_update_sb(mddev, 0);
7336 sysfs_notify_dirent_safe(mddev->sysfs_state);
7338 spin_unlock_irq(&mddev->write_lock);
7340 if (test_bit(MD_CHANGE_PENDING, &mddev->flags))
7345 EXPORT_SYMBOL_GPL(md_allow_write);
7347 #define SYNC_MARKS 10
7348 #define SYNC_MARK_STEP (3*HZ)
7349 #define UPDATE_FREQUENCY (5*60*HZ)
7350 void md_do_sync(struct md_thread *thread)
7352 struct mddev *mddev = thread->mddev;
7353 struct mddev *mddev2;
7354 unsigned int currspeed = 0,
7356 sector_t max_sectors,j, io_sectors;
7357 unsigned long mark[SYNC_MARKS];
7358 unsigned long update_time;
7359 sector_t mark_cnt[SYNC_MARKS];
7361 struct list_head *tmp;
7362 sector_t last_check;
7364 struct md_rdev *rdev;
7365 char *desc, *action = NULL;
7366 struct blk_plug plug;
7368 /* just incase thread restarts... */
7369 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
7371 if (mddev->ro) /* never try to sync a read-only array */
7374 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
7375 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) {
7376 desc = "data-check";
7378 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
7379 desc = "requested-resync";
7383 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
7388 mddev->last_sync_action = action ?: desc;
7390 /* we overload curr_resync somewhat here.
7391 * 0 == not engaged in resync at all
7392 * 2 == checking that there is no conflict with another sync
7393 * 1 == like 2, but have yielded to allow conflicting resync to
7395 * other == active in resync - this many blocks
7397 * Before starting a resync we must have set curr_resync to
7398 * 2, and then checked that every "conflicting" array has curr_resync
7399 * less than ours. When we find one that is the same or higher
7400 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
7401 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
7402 * This will mean we have to start checking from the beginning again.
7407 mddev->curr_resync = 2;
7410 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
7412 for_each_mddev(mddev2, tmp) {
7413 if (mddev2 == mddev)
7415 if (!mddev->parallel_resync
7416 && mddev2->curr_resync
7417 && match_mddev_units(mddev, mddev2)) {
7419 if (mddev < mddev2 && mddev->curr_resync == 2) {
7420 /* arbitrarily yield */
7421 mddev->curr_resync = 1;
7422 wake_up(&resync_wait);
7424 if (mddev > mddev2 && mddev->curr_resync == 1)
7425 /* no need to wait here, we can wait the next
7426 * time 'round when curr_resync == 2
7429 /* We need to wait 'interruptible' so as not to
7430 * contribute to the load average, and not to
7431 * be caught by 'softlockup'
7433 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
7434 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
7435 mddev2->curr_resync >= mddev->curr_resync) {
7436 printk(KERN_INFO "md: delaying %s of %s"
7437 " until %s has finished (they"
7438 " share one or more physical units)\n",
7439 desc, mdname(mddev), mdname(mddev2));
7441 if (signal_pending(current))
7442 flush_signals(current);
7444 finish_wait(&resync_wait, &wq);
7447 finish_wait(&resync_wait, &wq);
7450 } while (mddev->curr_resync < 2);
7453 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
7454 /* resync follows the size requested by the personality,
7455 * which defaults to physical size, but can be virtual size
7457 max_sectors = mddev->resync_max_sectors;
7458 atomic64_set(&mddev->resync_mismatches, 0);
7459 /* we don't use the checkpoint if there's a bitmap */
7460 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
7461 j = mddev->resync_min;
7462 else if (!mddev->bitmap)
7463 j = mddev->recovery_cp;
7465 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
7466 max_sectors = mddev->resync_max_sectors;
7468 /* recovery follows the physical size of devices */
7469 max_sectors = mddev->dev_sectors;
7472 rdev_for_each_rcu(rdev, mddev)
7473 if (rdev->raid_disk >= 0 &&
7474 !test_bit(Faulty, &rdev->flags) &&
7475 !test_bit(In_sync, &rdev->flags) &&
7476 rdev->recovery_offset < j)
7477 j = rdev->recovery_offset;
7481 printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev));
7482 printk(KERN_INFO "md: minimum _guaranteed_ speed:"
7483 " %d KB/sec/disk.\n", speed_min(mddev));
7484 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
7485 "(but not more than %d KB/sec) for %s.\n",
7486 speed_max(mddev), desc);
7488 is_mddev_idle(mddev, 1); /* this initializes IO event counters */
7491 for (m = 0; m < SYNC_MARKS; m++) {
7493 mark_cnt[m] = io_sectors;
7496 mddev->resync_mark = mark[last_mark];
7497 mddev->resync_mark_cnt = mark_cnt[last_mark];
7500 * Tune reconstruction:
7502 window = 32*(PAGE_SIZE/512);
7503 printk(KERN_INFO "md: using %dk window, over a total of %lluk.\n",
7504 window/2, (unsigned long long)max_sectors/2);
7506 atomic_set(&mddev->recovery_active, 0);
7511 "md: resuming %s of %s from checkpoint.\n",
7512 desc, mdname(mddev));
7513 mddev->curr_resync = j;
7515 mddev->curr_resync = 3; /* no longer delayed */
7516 mddev->curr_resync_completed = j;
7517 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
7518 md_new_event(mddev);
7519 update_time = jiffies;
7521 blk_start_plug(&plug);
7522 while (j < max_sectors) {
7527 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
7528 ((mddev->curr_resync > mddev->curr_resync_completed &&
7529 (mddev->curr_resync - mddev->curr_resync_completed)
7530 > (max_sectors >> 4)) ||
7531 time_after_eq(jiffies, update_time + UPDATE_FREQUENCY) ||
7532 (j - mddev->curr_resync_completed)*2
7533 >= mddev->resync_max - mddev->curr_resync_completed
7535 /* time to update curr_resync_completed */
7536 wait_event(mddev->recovery_wait,
7537 atomic_read(&mddev->recovery_active) == 0);
7538 mddev->curr_resync_completed = j;
7539 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) &&
7540 j > mddev->recovery_cp)
7541 mddev->recovery_cp = j;
7542 update_time = jiffies;
7543 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
7544 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
7547 while (j >= mddev->resync_max &&
7548 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
7549 /* As this condition is controlled by user-space,
7550 * we can block indefinitely, so use '_interruptible'
7551 * to avoid triggering warnings.
7553 flush_signals(current); /* just in case */
7554 wait_event_interruptible(mddev->recovery_wait,
7555 mddev->resync_max > j
7556 || test_bit(MD_RECOVERY_INTR,
7560 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
7563 sectors = mddev->pers->sync_request(mddev, j, &skipped,
7564 currspeed < speed_min(mddev));
7566 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7570 if (!skipped) { /* actual IO requested */
7571 io_sectors += sectors;
7572 atomic_add(sectors, &mddev->recovery_active);
7575 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
7580 mddev->curr_resync = j;
7581 mddev->curr_mark_cnt = io_sectors;
7582 if (last_check == 0)
7583 /* this is the earliest that rebuild will be
7584 * visible in /proc/mdstat
7586 md_new_event(mddev);
7588 if (last_check + window > io_sectors || j == max_sectors)
7591 last_check = io_sectors;
7593 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
7595 int next = (last_mark+1) % SYNC_MARKS;
7597 mddev->resync_mark = mark[next];
7598 mddev->resync_mark_cnt = mark_cnt[next];
7599 mark[next] = jiffies;
7600 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
7604 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
7608 * this loop exits only if either when we are slower than
7609 * the 'hard' speed limit, or the system was IO-idle for
7611 * the system might be non-idle CPU-wise, but we only care
7612 * about not overloading the IO subsystem. (things like an
7613 * e2fsck being done on the RAID array should execute fast)
7617 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
7618 /((jiffies-mddev->resync_mark)/HZ +1) +1;
7620 if (currspeed > speed_min(mddev)) {
7621 if ((currspeed > speed_max(mddev)) ||
7622 !is_mddev_idle(mddev, 0)) {
7628 printk(KERN_INFO "md: %s: %s %s.\n",mdname(mddev), desc,
7629 test_bit(MD_RECOVERY_INTR, &mddev->recovery)
7630 ? "interrupted" : "done");
7632 * this also signals 'finished resyncing' to md_stop
7634 blk_finish_plug(&plug);
7635 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
7637 /* tell personality that we are finished */
7638 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
7640 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
7641 mddev->curr_resync > 2) {
7642 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
7643 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
7644 if (mddev->curr_resync >= mddev->recovery_cp) {
7646 "md: checkpointing %s of %s.\n",
7647 desc, mdname(mddev));
7648 if (test_bit(MD_RECOVERY_ERROR,
7650 mddev->recovery_cp =
7651 mddev->curr_resync_completed;
7653 mddev->recovery_cp =
7657 mddev->recovery_cp = MaxSector;
7659 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
7660 mddev->curr_resync = MaxSector;
7662 rdev_for_each_rcu(rdev, mddev)
7663 if (rdev->raid_disk >= 0 &&
7664 mddev->delta_disks >= 0 &&
7665 !test_bit(Faulty, &rdev->flags) &&
7666 !test_bit(In_sync, &rdev->flags) &&
7667 rdev->recovery_offset < mddev->curr_resync)
7668 rdev->recovery_offset = mddev->curr_resync;
7673 set_bit(MD_CHANGE_DEVS, &mddev->flags);
7675 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
7676 /* We completed so min/max setting can be forgotten if used. */
7677 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
7678 mddev->resync_min = 0;
7679 mddev->resync_max = MaxSector;
7680 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
7681 mddev->resync_min = mddev->curr_resync_completed;
7682 mddev->curr_resync = 0;
7683 wake_up(&resync_wait);
7684 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
7685 md_wakeup_thread(mddev->thread);
7688 EXPORT_SYMBOL_GPL(md_do_sync);
7690 static int remove_and_add_spares(struct mddev *mddev,
7691 struct md_rdev *this)
7693 struct md_rdev *rdev;
7697 rdev_for_each(rdev, mddev)
7698 if ((this == NULL || rdev == this) &&
7699 rdev->raid_disk >= 0 &&
7700 !test_bit(Blocked, &rdev->flags) &&
7701 (test_bit(Faulty, &rdev->flags) ||
7702 ! test_bit(In_sync, &rdev->flags)) &&
7703 atomic_read(&rdev->nr_pending)==0) {
7704 if (mddev->pers->hot_remove_disk(
7705 mddev, rdev) == 0) {
7706 sysfs_unlink_rdev(mddev, rdev);
7707 rdev->raid_disk = -1;
7711 if (removed && mddev->kobj.sd)
7712 sysfs_notify(&mddev->kobj, NULL, "degraded");
7717 rdev_for_each(rdev, mddev) {
7718 if (rdev->raid_disk >= 0 &&
7719 !test_bit(In_sync, &rdev->flags) &&
7720 !test_bit(Faulty, &rdev->flags))
7722 if (rdev->raid_disk >= 0)
7724 if (test_bit(Faulty, &rdev->flags))
7727 ! (rdev->saved_raid_disk >= 0 &&
7728 !test_bit(Bitmap_sync, &rdev->flags)))
7731 rdev->recovery_offset = 0;
7733 hot_add_disk(mddev, rdev) == 0) {
7734 if (sysfs_link_rdev(mddev, rdev))
7735 /* failure here is OK */;
7737 md_new_event(mddev);
7738 set_bit(MD_CHANGE_DEVS, &mddev->flags);
7743 set_bit(MD_CHANGE_DEVS, &mddev->flags);
7748 * This routine is regularly called by all per-raid-array threads to
7749 * deal with generic issues like resync and super-block update.
7750 * Raid personalities that don't have a thread (linear/raid0) do not
7751 * need this as they never do any recovery or update the superblock.
7753 * It does not do any resync itself, but rather "forks" off other threads
7754 * to do that as needed.
7755 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
7756 * "->recovery" and create a thread at ->sync_thread.
7757 * When the thread finishes it sets MD_RECOVERY_DONE
7758 * and wakeups up this thread which will reap the thread and finish up.
7759 * This thread also removes any faulty devices (with nr_pending == 0).
7761 * The overall approach is:
7762 * 1/ if the superblock needs updating, update it.
7763 * 2/ If a recovery thread is running, don't do anything else.
7764 * 3/ If recovery has finished, clean up, possibly marking spares active.
7765 * 4/ If there are any faulty devices, remove them.
7766 * 5/ If array is degraded, try to add spares devices
7767 * 6/ If array has spares or is not in-sync, start a resync thread.
7769 void md_check_recovery(struct mddev *mddev)
7771 if (mddev->suspended)
7775 bitmap_daemon_work(mddev);
7777 if (signal_pending(current)) {
7778 if (mddev->pers->sync_request && !mddev->external) {
7779 printk(KERN_INFO "md: %s in immediate safe mode\n",
7781 mddev->safemode = 2;
7783 flush_signals(current);
7786 if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
7789 (mddev->flags & MD_UPDATE_SB_FLAGS & ~ (1<<MD_CHANGE_PENDING)) ||
7790 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
7791 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
7792 (mddev->external == 0 && mddev->safemode == 1) ||
7793 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
7794 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
7798 if (mddev_trylock(mddev)) {
7802 /* On a read-only array we can:
7803 * - remove failed devices
7804 * - add already-in_sync devices if the array itself
7806 * As we only add devices that are already in-sync,
7807 * we can activate the spares immediately.
7809 remove_and_add_spares(mddev, NULL);
7810 /* There is no thread, but we need to call
7811 * ->spare_active and clear saved_raid_disk
7813 md_reap_sync_thread(mddev);
7814 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7818 if (!mddev->external) {
7820 spin_lock_irq(&mddev->write_lock);
7821 if (mddev->safemode &&
7822 !atomic_read(&mddev->writes_pending) &&
7824 mddev->recovery_cp == MaxSector) {
7827 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
7829 if (mddev->safemode == 1)
7830 mddev->safemode = 0;
7831 spin_unlock_irq(&mddev->write_lock);
7833 sysfs_notify_dirent_safe(mddev->sysfs_state);
7836 if (mddev->flags & MD_UPDATE_SB_FLAGS)
7837 md_update_sb(mddev, 0);
7839 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
7840 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
7841 /* resync/recovery still happening */
7842 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7845 if (mddev->sync_thread) {
7846 md_reap_sync_thread(mddev);
7849 /* Set RUNNING before clearing NEEDED to avoid
7850 * any transients in the value of "sync_action".
7852 mddev->curr_resync_completed = 0;
7853 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7854 /* Clear some bits that don't mean anything, but
7857 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
7858 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
7860 if (!test_and_clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
7861 test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
7863 /* no recovery is running.
7864 * remove any failed drives, then
7865 * add spares if possible.
7866 * Spares are also removed and re-added, to allow
7867 * the personality to fail the re-add.
7870 if (mddev->reshape_position != MaxSector) {
7871 if (mddev->pers->check_reshape == NULL ||
7872 mddev->pers->check_reshape(mddev) != 0)
7873 /* Cannot proceed */
7875 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
7876 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7877 } else if ((spares = remove_and_add_spares(mddev, NULL))) {
7878 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7879 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
7880 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
7881 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7882 } else if (mddev->recovery_cp < MaxSector) {
7883 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7884 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7885 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
7886 /* nothing to be done ... */
7889 if (mddev->pers->sync_request) {
7891 /* We are adding a device or devices to an array
7892 * which has the bitmap stored on all devices.
7893 * So make sure all bitmap pages get written
7895 bitmap_write_all(mddev->bitmap);
7897 mddev->sync_thread = md_register_thread(md_do_sync,
7900 if (!mddev->sync_thread) {
7901 printk(KERN_ERR "%s: could not start resync"
7904 /* leave the spares where they are, it shouldn't hurt */
7905 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7906 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7907 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
7908 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
7909 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
7911 md_wakeup_thread(mddev->sync_thread);
7912 sysfs_notify_dirent_safe(mddev->sysfs_action);
7913 md_new_event(mddev);
7916 wake_up(&mddev->sb_wait);
7918 if (!mddev->sync_thread) {
7919 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7920 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
7922 if (mddev->sysfs_action)
7923 sysfs_notify_dirent_safe(mddev->sysfs_action);
7925 mddev_unlock(mddev);
7929 void md_reap_sync_thread(struct mddev *mddev)
7931 struct md_rdev *rdev;
7933 /* resync has finished, collect result */
7934 md_unregister_thread(&mddev->sync_thread);
7935 wake_up(&resync_wait);
7936 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
7937 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
7939 /* activate any spares */
7940 if (mddev->pers->spare_active(mddev)) {
7941 sysfs_notify(&mddev->kobj, NULL,
7943 set_bit(MD_CHANGE_DEVS, &mddev->flags);
7946 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
7947 mddev->pers->finish_reshape)
7948 mddev->pers->finish_reshape(mddev);
7950 /* If array is no-longer degraded, then any saved_raid_disk
7951 * information must be scrapped. Also if any device is now
7952 * In_sync we must scrape the saved_raid_disk for that device
7953 * do the superblock for an incrementally recovered device
7956 rdev_for_each(rdev, mddev)
7957 if (!mddev->degraded ||
7958 test_bit(In_sync, &rdev->flags))
7959 rdev->saved_raid_disk = -1;
7961 md_update_sb(mddev, 1);
7962 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7963 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7964 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
7965 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
7966 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
7967 /* flag recovery needed just to double check */
7968 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7969 sysfs_notify_dirent_safe(mddev->sysfs_action);
7970 md_new_event(mddev);
7971 if (mddev->event_work.func)
7972 queue_work(md_misc_wq, &mddev->event_work);
7975 void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev)
7977 sysfs_notify_dirent_safe(rdev->sysfs_state);
7978 wait_event_timeout(rdev->blocked_wait,
7979 !test_bit(Blocked, &rdev->flags) &&
7980 !test_bit(BlockedBadBlocks, &rdev->flags),
7981 msecs_to_jiffies(5000));
7982 rdev_dec_pending(rdev, mddev);
7984 EXPORT_SYMBOL(md_wait_for_blocked_rdev);
7986 void md_finish_reshape(struct mddev *mddev)
7988 /* called be personality module when reshape completes. */
7989 struct md_rdev *rdev;
7991 rdev_for_each(rdev, mddev) {
7992 if (rdev->data_offset > rdev->new_data_offset)
7993 rdev->sectors += rdev->data_offset - rdev->new_data_offset;
7995 rdev->sectors -= rdev->new_data_offset - rdev->data_offset;
7996 rdev->data_offset = rdev->new_data_offset;
7999 EXPORT_SYMBOL(md_finish_reshape);
8001 /* Bad block management.
8002 * We can record which blocks on each device are 'bad' and so just
8003 * fail those blocks, or that stripe, rather than the whole device.
8004 * Entries in the bad-block table are 64bits wide. This comprises:
8005 * Length of bad-range, in sectors: 0-511 for lengths 1-512
8006 * Start of bad-range, sector offset, 54 bits (allows 8 exbibytes)
8007 * A 'shift' can be set so that larger blocks are tracked and
8008 * consequently larger devices can be covered.
8009 * 'Acknowledged' flag - 1 bit. - the most significant bit.
8011 * Locking of the bad-block table uses a seqlock so md_is_badblock
8012 * might need to retry if it is very unlucky.
8013 * We will sometimes want to check for bad blocks in a bi_end_io function,
8014 * so we use the write_seqlock_irq variant.
8016 * When looking for a bad block we specify a range and want to
8017 * know if any block in the range is bad. So we binary-search
8018 * to the last range that starts at-or-before the given endpoint,
8019 * (or "before the sector after the target range")
8020 * then see if it ends after the given start.
8022 * 0 if there are no known bad blocks in the range
8023 * 1 if there are known bad block which are all acknowledged
8024 * -1 if there are bad blocks which have not yet been acknowledged in metadata.
8025 * plus the start/length of the first bad section we overlap.
8027 int md_is_badblock(struct badblocks *bb, sector_t s, int sectors,
8028 sector_t *first_bad, int *bad_sectors)
8034 sector_t target = s + sectors;
8037 if (bb->shift > 0) {
8038 /* round the start down, and the end up */
8040 target += (1<<bb->shift) - 1;
8041 target >>= bb->shift;
8042 sectors = target - s;
8044 /* 'target' is now the first block after the bad range */
8047 seq = read_seqbegin(&bb->lock);
8052 /* Binary search between lo and hi for 'target'
8053 * i.e. for the last range that starts before 'target'
8055 /* INVARIANT: ranges before 'lo' and at-or-after 'hi'
8056 * are known not to be the last range before target.
8057 * VARIANT: hi-lo is the number of possible
8058 * ranges, and decreases until it reaches 1
8060 while (hi - lo > 1) {
8061 int mid = (lo + hi) / 2;
8062 sector_t a = BB_OFFSET(p[mid]);
8064 /* This could still be the one, earlier ranges
8068 /* This and later ranges are definitely out. */
8071 /* 'lo' might be the last that started before target, but 'hi' isn't */
8073 /* need to check all range that end after 's' to see if
8074 * any are unacknowledged.
8077 BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) {
8078 if (BB_OFFSET(p[lo]) < target) {
8079 /* starts before the end, and finishes after
8080 * the start, so they must overlap
8082 if (rv != -1 && BB_ACK(p[lo]))
8086 *first_bad = BB_OFFSET(p[lo]);
8087 *bad_sectors = BB_LEN(p[lo]);
8093 if (read_seqretry(&bb->lock, seq))
8098 EXPORT_SYMBOL_GPL(md_is_badblock);
8101 * Add a range of bad blocks to the table.
8102 * This might extend the table, or might contract it
8103 * if two adjacent ranges can be merged.
8104 * We binary-search to find the 'insertion' point, then
8105 * decide how best to handle it.
8107 static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors,
8113 unsigned long flags;
8116 /* badblocks are disabled */
8120 /* round the start down, and the end up */
8121 sector_t next = s + sectors;
8123 next += (1<<bb->shift) - 1;
8128 write_seqlock_irqsave(&bb->lock, flags);
8133 /* Find the last range that starts at-or-before 's' */
8134 while (hi - lo > 1) {
8135 int mid = (lo + hi) / 2;
8136 sector_t a = BB_OFFSET(p[mid]);
8142 if (hi > lo && BB_OFFSET(p[lo]) > s)
8146 /* we found a range that might merge with the start
8149 sector_t a = BB_OFFSET(p[lo]);
8150 sector_t e = a + BB_LEN(p[lo]);
8151 int ack = BB_ACK(p[lo]);
8153 /* Yes, we can merge with a previous range */
8154 if (s == a && s + sectors >= e)
8155 /* new range covers old */
8158 ack = ack && acknowledged;
8160 if (e < s + sectors)
8162 if (e - a <= BB_MAX_LEN) {
8163 p[lo] = BB_MAKE(a, e-a, ack);
8166 /* does not all fit in one range,
8167 * make p[lo] maximal
8169 if (BB_LEN(p[lo]) != BB_MAX_LEN)
8170 p[lo] = BB_MAKE(a, BB_MAX_LEN, ack);
8176 if (sectors && hi < bb->count) {
8177 /* 'hi' points to the first range that starts after 's'.
8178 * Maybe we can merge with the start of that range */
8179 sector_t a = BB_OFFSET(p[hi]);
8180 sector_t e = a + BB_LEN(p[hi]);
8181 int ack = BB_ACK(p[hi]);
8182 if (a <= s + sectors) {
8183 /* merging is possible */
8184 if (e <= s + sectors) {
8189 ack = ack && acknowledged;
8192 if (e - a <= BB_MAX_LEN) {
8193 p[hi] = BB_MAKE(a, e-a, ack);
8196 p[hi] = BB_MAKE(a, BB_MAX_LEN, ack);
8204 if (sectors == 0 && hi < bb->count) {
8205 /* we might be able to combine lo and hi */
8206 /* Note: 's' is at the end of 'lo' */
8207 sector_t a = BB_OFFSET(p[hi]);
8208 int lolen = BB_LEN(p[lo]);
8209 int hilen = BB_LEN(p[hi]);
8210 int newlen = lolen + hilen - (s - a);
8211 if (s >= a && newlen < BB_MAX_LEN) {
8212 /* yes, we can combine them */
8213 int ack = BB_ACK(p[lo]) && BB_ACK(p[hi]);
8214 p[lo] = BB_MAKE(BB_OFFSET(p[lo]), newlen, ack);
8215 memmove(p + hi, p + hi + 1,
8216 (bb->count - hi - 1) * 8);
8221 /* didn't merge (it all).
8222 * Need to add a range just before 'hi' */
8223 if (bb->count >= MD_MAX_BADBLOCKS) {
8224 /* No room for more */
8228 int this_sectors = sectors;
8229 memmove(p + hi + 1, p + hi,
8230 (bb->count - hi) * 8);
8233 if (this_sectors > BB_MAX_LEN)
8234 this_sectors = BB_MAX_LEN;
8235 p[hi] = BB_MAKE(s, this_sectors, acknowledged);
8236 sectors -= this_sectors;
8243 bb->unacked_exist = 1;
8244 write_sequnlock_irqrestore(&bb->lock, flags);
8249 int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
8254 s += rdev->new_data_offset;
8256 s += rdev->data_offset;
8257 rv = md_set_badblocks(&rdev->badblocks,
8260 /* Make sure they get written out promptly */
8261 sysfs_notify_dirent_safe(rdev->sysfs_state);
8262 set_bit(MD_CHANGE_CLEAN, &rdev->mddev->flags);
8263 md_wakeup_thread(rdev->mddev->thread);
8267 EXPORT_SYMBOL_GPL(rdev_set_badblocks);
8270 * Remove a range of bad blocks from the table.
8271 * This may involve extending the table if we spilt a region,
8272 * but it must not fail. So if the table becomes full, we just
8273 * drop the remove request.
8275 static int md_clear_badblocks(struct badblocks *bb, sector_t s, int sectors)
8279 sector_t target = s + sectors;
8282 if (bb->shift > 0) {
8283 /* When clearing we round the start up and the end down.
8284 * This should not matter as the shift should align with
8285 * the block size and no rounding should ever be needed.
8286 * However it is better the think a block is bad when it
8287 * isn't than to think a block is not bad when it is.
8289 s += (1<<bb->shift) - 1;
8291 target >>= bb->shift;
8292 sectors = target - s;
8295 write_seqlock_irq(&bb->lock);
8300 /* Find the last range that starts before 'target' */
8301 while (hi - lo > 1) {
8302 int mid = (lo + hi) / 2;
8303 sector_t a = BB_OFFSET(p[mid]);
8310 /* p[lo] is the last range that could overlap the
8311 * current range. Earlier ranges could also overlap,
8312 * but only this one can overlap the end of the range.
8314 if (BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > target) {
8315 /* Partial overlap, leave the tail of this range */
8316 int ack = BB_ACK(p[lo]);
8317 sector_t a = BB_OFFSET(p[lo]);
8318 sector_t end = a + BB_LEN(p[lo]);
8321 /* we need to split this range */
8322 if (bb->count >= MD_MAX_BADBLOCKS) {
8326 memmove(p+lo+1, p+lo, (bb->count - lo) * 8);
8328 p[lo] = BB_MAKE(a, s-a, ack);
8331 p[lo] = BB_MAKE(target, end - target, ack);
8332 /* there is no longer an overlap */
8337 BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) {
8338 /* This range does overlap */
8339 if (BB_OFFSET(p[lo]) < s) {
8340 /* Keep the early parts of this range. */
8341 int ack = BB_ACK(p[lo]);
8342 sector_t start = BB_OFFSET(p[lo]);
8343 p[lo] = BB_MAKE(start, s - start, ack);
8344 /* now low doesn't overlap, so.. */
8349 /* 'lo' is strictly before, 'hi' is strictly after,
8350 * anything between needs to be discarded
8353 memmove(p+lo+1, p+hi, (bb->count - hi) * 8);
8354 bb->count -= (hi - lo - 1);
8360 write_sequnlock_irq(&bb->lock);
8364 int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
8368 s += rdev->new_data_offset;
8370 s += rdev->data_offset;
8371 return md_clear_badblocks(&rdev->badblocks,
8374 EXPORT_SYMBOL_GPL(rdev_clear_badblocks);
8377 * Acknowledge all bad blocks in a list.
8378 * This only succeeds if ->changed is clear. It is used by
8379 * in-kernel metadata updates
8381 void md_ack_all_badblocks(struct badblocks *bb)
8383 if (bb->page == NULL || bb->changed)
8384 /* no point even trying */
8386 write_seqlock_irq(&bb->lock);
8388 if (bb->changed == 0 && bb->unacked_exist) {
8391 for (i = 0; i < bb->count ; i++) {
8392 if (!BB_ACK(p[i])) {
8393 sector_t start = BB_OFFSET(p[i]);
8394 int len = BB_LEN(p[i]);
8395 p[i] = BB_MAKE(start, len, 1);
8398 bb->unacked_exist = 0;
8400 write_sequnlock_irq(&bb->lock);
8402 EXPORT_SYMBOL_GPL(md_ack_all_badblocks);
8404 /* sysfs access to bad-blocks list.
8405 * We present two files.
8406 * 'bad-blocks' lists sector numbers and lengths of ranges that
8407 * are recorded as bad. The list is truncated to fit within
8408 * the one-page limit of sysfs.
8409 * Writing "sector length" to this file adds an acknowledged
8411 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
8412 * been acknowledged. Writing to this file adds bad blocks
8413 * without acknowledging them. This is largely for testing.
8417 badblocks_show(struct badblocks *bb, char *page, int unack)
8428 seq = read_seqbegin(&bb->lock);
8433 while (len < PAGE_SIZE && i < bb->count) {
8434 sector_t s = BB_OFFSET(p[i]);
8435 unsigned int length = BB_LEN(p[i]);
8436 int ack = BB_ACK(p[i]);
8442 len += snprintf(page+len, PAGE_SIZE-len, "%llu %u\n",
8443 (unsigned long long)s << bb->shift,
8444 length << bb->shift);
8446 if (unack && len == 0)
8447 bb->unacked_exist = 0;
8449 if (read_seqretry(&bb->lock, seq))
8458 badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack)
8460 unsigned long long sector;
8464 /* Allow clearing via sysfs *only* for testing/debugging.
8465 * Normally only a successful write may clear a badblock
8468 if (page[0] == '-') {
8472 #endif /* DO_DEBUG */
8474 switch (sscanf(page, "%llu %d%c", §or, &length, &newline)) {
8476 if (newline != '\n')
8488 md_clear_badblocks(bb, sector, length);
8491 #endif /* DO_DEBUG */
8492 if (md_set_badblocks(bb, sector, length, !unack))
8498 static int md_notify_reboot(struct notifier_block *this,
8499 unsigned long code, void *x)
8501 struct list_head *tmp;
8502 struct mddev *mddev;
8505 for_each_mddev(mddev, tmp) {
8506 if (mddev_trylock(mddev)) {
8508 __md_stop_writes(mddev);
8509 mddev->safemode = 2;
8510 mddev_unlock(mddev);
8515 * certain more exotic SCSI devices are known to be
8516 * volatile wrt too early system reboots. While the
8517 * right place to handle this issue is the given
8518 * driver, we do want to have a safe RAID driver ...
8526 static struct notifier_block md_notifier = {
8527 .notifier_call = md_notify_reboot,
8529 .priority = INT_MAX, /* before any real devices */
8532 static void md_geninit(void)
8534 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
8536 proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops);
8539 static int __init md_init(void)
8543 md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0);
8547 md_misc_wq = alloc_workqueue("md_misc", 0, 0);
8551 if ((ret = register_blkdev(MD_MAJOR, "md")) < 0)
8554 if ((ret = register_blkdev(0, "mdp")) < 0)
8558 blk_register_region(MKDEV(MD_MAJOR, 0), 1UL<<MINORBITS, THIS_MODULE,
8559 md_probe, NULL, NULL);
8560 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
8561 md_probe, NULL, NULL);
8563 register_reboot_notifier(&md_notifier);
8564 raid_table_header = register_sysctl_table(raid_root_table);
8570 unregister_blkdev(MD_MAJOR, "md");
8572 destroy_workqueue(md_misc_wq);
8574 destroy_workqueue(md_wq);
8582 * Searches all registered partitions for autorun RAID arrays
8586 static LIST_HEAD(all_detected_devices);
8587 struct detected_devices_node {
8588 struct list_head list;
8592 void md_autodetect_dev(dev_t dev)
8594 struct detected_devices_node *node_detected_dev;
8596 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
8597 if (node_detected_dev) {
8598 node_detected_dev->dev = dev;
8599 list_add_tail(&node_detected_dev->list, &all_detected_devices);
8601 printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed"
8602 ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev));
8607 static void autostart_arrays(int part)
8609 struct md_rdev *rdev;
8610 struct detected_devices_node *node_detected_dev;
8612 int i_scanned, i_passed;
8617 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
8619 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
8621 node_detected_dev = list_entry(all_detected_devices.next,
8622 struct detected_devices_node, list);
8623 list_del(&node_detected_dev->list);
8624 dev = node_detected_dev->dev;
8625 kfree(node_detected_dev);
8626 rdev = md_import_device(dev,0, 90);
8630 if (test_bit(Faulty, &rdev->flags)) {
8634 set_bit(AutoDetected, &rdev->flags);
8635 list_add(&rdev->same_set, &pending_raid_disks);
8639 printk(KERN_INFO "md: Scanned %d and added %d devices.\n",
8640 i_scanned, i_passed);
8642 autorun_devices(part);
8645 #endif /* !MODULE */
8647 static __exit void md_exit(void)
8649 struct mddev *mddev;
8650 struct list_head *tmp;
8652 blk_unregister_region(MKDEV(MD_MAJOR,0), 1U << MINORBITS);
8653 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
8655 unregister_blkdev(MD_MAJOR,"md");
8656 unregister_blkdev(mdp_major, "mdp");
8657 unregister_reboot_notifier(&md_notifier);
8658 unregister_sysctl_table(raid_table_header);
8659 remove_proc_entry("mdstat", NULL);
8660 for_each_mddev(mddev, tmp) {
8661 export_array(mddev);
8662 mddev->hold_active = 0;
8664 destroy_workqueue(md_misc_wq);
8665 destroy_workqueue(md_wq);
8668 subsys_initcall(md_init);
8669 module_exit(md_exit)
8671 static int get_ro(char *buffer, struct kernel_param *kp)
8673 return sprintf(buffer, "%d", start_readonly);
8675 static int set_ro(const char *val, struct kernel_param *kp)
8678 int num = simple_strtoul(val, &e, 10);
8679 if (*val && (*e == '\0' || *e == '\n')) {
8680 start_readonly = num;
8686 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
8687 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
8689 module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR);
8691 EXPORT_SYMBOL(register_md_personality);
8692 EXPORT_SYMBOL(unregister_md_personality);
8693 EXPORT_SYMBOL(md_error);
8694 EXPORT_SYMBOL(md_done_sync);
8695 EXPORT_SYMBOL(md_write_start);
8696 EXPORT_SYMBOL(md_write_end);
8697 EXPORT_SYMBOL(md_register_thread);
8698 EXPORT_SYMBOL(md_unregister_thread);
8699 EXPORT_SYMBOL(md_wakeup_thread);
8700 EXPORT_SYMBOL(md_check_recovery);
8701 EXPORT_SYMBOL(md_reap_sync_thread);
8702 MODULE_LICENSE("GPL");
8703 MODULE_DESCRIPTION("MD RAID framework");
8705 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);