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>
39 #include <linux/mutex.h>
40 #include <linux/buffer_head.h> /* for invalidate_bdev */
41 #include <linux/poll.h>
42 #include <linux/ctype.h>
43 #include <linux/string.h>
44 #include <linux/hdreg.h>
45 #include <linux/proc_fs.h>
46 #include <linux/random.h>
47 #include <linux/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 #define dprintk(x...) ((void)(DEBUG && printk(x)))
61 static void autostart_arrays(int part);
64 static LIST_HEAD(pers_list);
65 static DEFINE_SPINLOCK(pers_lock);
67 static void md_print_devices(void);
69 static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
70 static struct workqueue_struct *md_wq;
71 static struct workqueue_struct *md_misc_wq;
73 #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
76 * Default number of read corrections we'll attempt on an rdev
77 * before ejecting it from the array. We divide the read error
78 * count by 2 for every hour elapsed between read errors.
80 #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
82 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
83 * is 1000 KB/sec, so the extra system load does not show up that much.
84 * Increase it if you want to have more _guaranteed_ speed. Note that
85 * the RAID driver will use the maximum available bandwidth if the IO
86 * subsystem is idle. There is also an 'absolute maximum' reconstruction
87 * speed limit - in case reconstruction slows down your system despite
90 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
91 * or /sys/block/mdX/md/sync_speed_{min,max}
94 static int sysctl_speed_limit_min = 1000;
95 static int sysctl_speed_limit_max = 200000;
96 static inline int speed_min(mddev_t *mddev)
98 return mddev->sync_speed_min ?
99 mddev->sync_speed_min : sysctl_speed_limit_min;
102 static inline int speed_max(mddev_t *mddev)
104 return mddev->sync_speed_max ?
105 mddev->sync_speed_max : sysctl_speed_limit_max;
108 static struct ctl_table_header *raid_table_header;
110 static ctl_table raid_table[] = {
112 .procname = "speed_limit_min",
113 .data = &sysctl_speed_limit_min,
114 .maxlen = sizeof(int),
115 .mode = S_IRUGO|S_IWUSR,
116 .proc_handler = proc_dointvec,
119 .procname = "speed_limit_max",
120 .data = &sysctl_speed_limit_max,
121 .maxlen = sizeof(int),
122 .mode = S_IRUGO|S_IWUSR,
123 .proc_handler = proc_dointvec,
128 static ctl_table raid_dir_table[] = {
132 .mode = S_IRUGO|S_IXUGO,
138 static ctl_table raid_root_table[] = {
143 .child = raid_dir_table,
148 static const struct block_device_operations md_fops;
150 static int start_readonly;
153 * like bio_clone, but with a local bio set
156 static void mddev_bio_destructor(struct bio *bio)
158 mddev_t *mddev, **mddevp;
163 bio_free(bio, mddev->bio_set);
166 struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs,
172 if (!mddev || !mddev->bio_set)
173 return bio_alloc(gfp_mask, nr_iovecs);
175 b = bio_alloc_bioset(gfp_mask, nr_iovecs,
181 b->bi_destructor = mddev_bio_destructor;
184 EXPORT_SYMBOL_GPL(bio_alloc_mddev);
186 struct bio *bio_clone_mddev(struct bio *bio, gfp_t gfp_mask,
192 if (!mddev || !mddev->bio_set)
193 return bio_clone(bio, gfp_mask);
195 b = bio_alloc_bioset(gfp_mask, bio->bi_max_vecs,
201 b->bi_destructor = mddev_bio_destructor;
203 if (bio_integrity(bio)) {
206 ret = bio_integrity_clone(b, bio, gfp_mask, mddev->bio_set);
216 EXPORT_SYMBOL_GPL(bio_clone_mddev);
219 * We have a system wide 'event count' that is incremented
220 * on any 'interesting' event, and readers of /proc/mdstat
221 * can use 'poll' or 'select' to find out when the event
225 * start array, stop array, error, add device, remove device,
226 * start build, activate spare
228 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
229 static atomic_t md_event_count;
230 void md_new_event(mddev_t *mddev)
232 atomic_inc(&md_event_count);
233 wake_up(&md_event_waiters);
235 EXPORT_SYMBOL_GPL(md_new_event);
237 /* Alternate version that can be called from interrupts
238 * when calling sysfs_notify isn't needed.
240 static void md_new_event_inintr(mddev_t *mddev)
242 atomic_inc(&md_event_count);
243 wake_up(&md_event_waiters);
247 * Enables to iterate over all existing md arrays
248 * all_mddevs_lock protects this list.
250 static LIST_HEAD(all_mddevs);
251 static DEFINE_SPINLOCK(all_mddevs_lock);
255 * iterates through all used mddevs in the system.
256 * We take care to grab the all_mddevs_lock whenever navigating
257 * the list, and to always hold a refcount when unlocked.
258 * Any code which breaks out of this loop while own
259 * a reference to the current mddev and must mddev_put it.
261 #define for_each_mddev(mddev,tmp) \
263 for (({ spin_lock(&all_mddevs_lock); \
264 tmp = all_mddevs.next; \
266 ({ if (tmp != &all_mddevs) \
267 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
268 spin_unlock(&all_mddevs_lock); \
269 if (mddev) mddev_put(mddev); \
270 mddev = list_entry(tmp, mddev_t, all_mddevs); \
271 tmp != &all_mddevs;}); \
272 ({ spin_lock(&all_mddevs_lock); \
277 /* Rather than calling directly into the personality make_request function,
278 * IO requests come here first so that we can check if the device is
279 * being suspended pending a reconfiguration.
280 * We hold a refcount over the call to ->make_request. By the time that
281 * call has finished, the bio has been linked into some internal structure
282 * and so is visible to ->quiesce(), so we don't need the refcount any more.
284 static int md_make_request(struct request_queue *q, struct bio *bio)
286 const int rw = bio_data_dir(bio);
287 mddev_t *mddev = q->queuedata;
290 unsigned int sectors;
292 if (mddev == NULL || mddev->pers == NULL
297 smp_rmb(); /* Ensure implications of 'active' are visible */
299 if (mddev->suspended) {
302 prepare_to_wait(&mddev->sb_wait, &__wait,
303 TASK_UNINTERRUPTIBLE);
304 if (!mddev->suspended)
310 finish_wait(&mddev->sb_wait, &__wait);
312 atomic_inc(&mddev->active_io);
316 * save the sectors now since our bio can
317 * go away inside make_request
319 sectors = bio_sectors(bio);
320 rv = mddev->pers->make_request(mddev, bio);
322 cpu = part_stat_lock();
323 part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]);
324 part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw], sectors);
327 if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended)
328 wake_up(&mddev->sb_wait);
333 /* mddev_suspend makes sure no new requests are submitted
334 * to the device, and that any requests that have been submitted
335 * are completely handled.
336 * Once ->stop is called and completes, the module will be completely
339 void mddev_suspend(mddev_t *mddev)
341 BUG_ON(mddev->suspended);
342 mddev->suspended = 1;
344 wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0);
345 mddev->pers->quiesce(mddev, 1);
347 EXPORT_SYMBOL_GPL(mddev_suspend);
349 void mddev_resume(mddev_t *mddev)
351 mddev->suspended = 0;
352 wake_up(&mddev->sb_wait);
353 mddev->pers->quiesce(mddev, 0);
355 EXPORT_SYMBOL_GPL(mddev_resume);
357 int mddev_congested(mddev_t *mddev, int bits)
359 return mddev->suspended;
361 EXPORT_SYMBOL(mddev_congested);
364 * Generic flush handling for md
367 static void md_end_flush(struct bio *bio, int err)
369 mdk_rdev_t *rdev = bio->bi_private;
370 mddev_t *mddev = rdev->mddev;
372 rdev_dec_pending(rdev, mddev);
374 if (atomic_dec_and_test(&mddev->flush_pending)) {
375 /* The pre-request flush has finished */
376 queue_work(md_wq, &mddev->flush_work);
381 static void md_submit_flush_data(struct work_struct *ws);
383 static void submit_flushes(struct work_struct *ws)
385 mddev_t *mddev = container_of(ws, mddev_t, flush_work);
388 INIT_WORK(&mddev->flush_work, md_submit_flush_data);
389 atomic_set(&mddev->flush_pending, 1);
391 list_for_each_entry_rcu(rdev, &mddev->disks, same_set)
392 if (rdev->raid_disk >= 0 &&
393 !test_bit(Faulty, &rdev->flags)) {
394 /* Take two references, one is dropped
395 * when request finishes, one after
396 * we reclaim rcu_read_lock
399 atomic_inc(&rdev->nr_pending);
400 atomic_inc(&rdev->nr_pending);
402 bi = bio_alloc_mddev(GFP_KERNEL, 0, mddev);
403 bi->bi_end_io = md_end_flush;
404 bi->bi_private = rdev;
405 bi->bi_bdev = rdev->bdev;
406 atomic_inc(&mddev->flush_pending);
407 submit_bio(WRITE_FLUSH, bi);
409 rdev_dec_pending(rdev, mddev);
412 if (atomic_dec_and_test(&mddev->flush_pending))
413 queue_work(md_wq, &mddev->flush_work);
416 static void md_submit_flush_data(struct work_struct *ws)
418 mddev_t *mddev = container_of(ws, mddev_t, flush_work);
419 struct bio *bio = mddev->flush_bio;
421 if (bio->bi_size == 0)
422 /* an empty barrier - all done */
425 bio->bi_rw &= ~REQ_FLUSH;
426 if (mddev->pers->make_request(mddev, bio))
427 generic_make_request(bio);
430 mddev->flush_bio = NULL;
431 wake_up(&mddev->sb_wait);
434 void md_flush_request(mddev_t *mddev, struct bio *bio)
436 spin_lock_irq(&mddev->write_lock);
437 wait_event_lock_irq(mddev->sb_wait,
439 mddev->write_lock, /*nothing*/);
440 mddev->flush_bio = bio;
441 spin_unlock_irq(&mddev->write_lock);
443 INIT_WORK(&mddev->flush_work, submit_flushes);
444 queue_work(md_wq, &mddev->flush_work);
446 EXPORT_SYMBOL(md_flush_request);
448 /* Support for plugging.
449 * This mirrors the plugging support in request_queue, but does not
450 * require having a whole queue
452 static void plugger_work(struct work_struct *work)
454 struct plug_handle *plug =
455 container_of(work, struct plug_handle, unplug_work);
456 plug->unplug_fn(plug);
458 static void plugger_timeout(unsigned long data)
460 struct plug_handle *plug = (void *)data;
461 kblockd_schedule_work(NULL, &plug->unplug_work);
463 void plugger_init(struct plug_handle *plug,
464 void (*unplug_fn)(struct plug_handle *))
466 plug->unplug_flag = 0;
467 plug->unplug_fn = unplug_fn;
468 init_timer(&plug->unplug_timer);
469 plug->unplug_timer.function = plugger_timeout;
470 plug->unplug_timer.data = (unsigned long)plug;
471 INIT_WORK(&plug->unplug_work, plugger_work);
473 EXPORT_SYMBOL_GPL(plugger_init);
475 void plugger_set_plug(struct plug_handle *plug)
477 if (!test_and_set_bit(PLUGGED_FLAG, &plug->unplug_flag))
478 mod_timer(&plug->unplug_timer, jiffies + msecs_to_jiffies(3)+1);
480 EXPORT_SYMBOL_GPL(plugger_set_plug);
482 int plugger_remove_plug(struct plug_handle *plug)
484 if (test_and_clear_bit(PLUGGED_FLAG, &plug->unplug_flag)) {
485 del_timer(&plug->unplug_timer);
490 EXPORT_SYMBOL_GPL(plugger_remove_plug);
493 static inline mddev_t *mddev_get(mddev_t *mddev)
495 atomic_inc(&mddev->active);
499 static void mddev_delayed_delete(struct work_struct *ws);
501 static void mddev_put(mddev_t *mddev)
503 struct bio_set *bs = NULL;
505 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
507 if (!mddev->raid_disks && list_empty(&mddev->disks) &&
508 mddev->ctime == 0 && !mddev->hold_active) {
509 /* Array is not configured at all, and not held active,
511 list_del(&mddev->all_mddevs);
513 mddev->bio_set = NULL;
514 if (mddev->gendisk) {
515 /* We did a probe so need to clean up. Call
516 * queue_work inside the spinlock so that
517 * flush_workqueue() after mddev_find will
518 * succeed in waiting for the work to be done.
520 INIT_WORK(&mddev->del_work, mddev_delayed_delete);
521 queue_work(md_misc_wq, &mddev->del_work);
525 spin_unlock(&all_mddevs_lock);
530 void mddev_init(mddev_t *mddev)
532 mutex_init(&mddev->open_mutex);
533 mutex_init(&mddev->reconfig_mutex);
534 mutex_init(&mddev->bitmap_info.mutex);
535 INIT_LIST_HEAD(&mddev->disks);
536 INIT_LIST_HEAD(&mddev->all_mddevs);
537 init_timer(&mddev->safemode_timer);
538 atomic_set(&mddev->active, 1);
539 atomic_set(&mddev->openers, 0);
540 atomic_set(&mddev->active_io, 0);
541 spin_lock_init(&mddev->write_lock);
542 atomic_set(&mddev->flush_pending, 0);
543 init_waitqueue_head(&mddev->sb_wait);
544 init_waitqueue_head(&mddev->recovery_wait);
545 mddev->reshape_position = MaxSector;
546 mddev->resync_min = 0;
547 mddev->resync_max = MaxSector;
548 mddev->level = LEVEL_NONE;
550 EXPORT_SYMBOL_GPL(mddev_init);
552 static mddev_t * mddev_find(dev_t unit)
554 mddev_t *mddev, *new = NULL;
557 spin_lock(&all_mddevs_lock);
560 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
561 if (mddev->unit == unit) {
563 spin_unlock(&all_mddevs_lock);
569 list_add(&new->all_mddevs, &all_mddevs);
570 spin_unlock(&all_mddevs_lock);
571 new->hold_active = UNTIL_IOCTL;
575 /* find an unused unit number */
576 static int next_minor = 512;
577 int start = next_minor;
581 dev = MKDEV(MD_MAJOR, next_minor);
583 if (next_minor > MINORMASK)
585 if (next_minor == start) {
586 /* Oh dear, all in use. */
587 spin_unlock(&all_mddevs_lock);
593 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
594 if (mddev->unit == dev) {
600 new->md_minor = MINOR(dev);
601 new->hold_active = UNTIL_STOP;
602 list_add(&new->all_mddevs, &all_mddevs);
603 spin_unlock(&all_mddevs_lock);
606 spin_unlock(&all_mddevs_lock);
608 new = kzalloc(sizeof(*new), GFP_KERNEL);
613 if (MAJOR(unit) == MD_MAJOR)
614 new->md_minor = MINOR(unit);
616 new->md_minor = MINOR(unit) >> MdpMinorShift;
623 static inline int mddev_lock(mddev_t * mddev)
625 return mutex_lock_interruptible(&mddev->reconfig_mutex);
628 static inline int mddev_is_locked(mddev_t *mddev)
630 return mutex_is_locked(&mddev->reconfig_mutex);
633 static inline int mddev_trylock(mddev_t * mddev)
635 return mutex_trylock(&mddev->reconfig_mutex);
638 static struct attribute_group md_redundancy_group;
640 static void mddev_unlock(mddev_t * mddev)
642 if (mddev->to_remove) {
643 /* These cannot be removed under reconfig_mutex as
644 * an access to the files will try to take reconfig_mutex
645 * while holding the file unremovable, which leads to
647 * So hold set sysfs_active while the remove in happeing,
648 * and anything else which might set ->to_remove or my
649 * otherwise change the sysfs namespace will fail with
650 * -EBUSY if sysfs_active is still set.
651 * We set sysfs_active under reconfig_mutex and elsewhere
652 * test it under the same mutex to ensure its correct value
655 struct attribute_group *to_remove = mddev->to_remove;
656 mddev->to_remove = NULL;
657 mddev->sysfs_active = 1;
658 mutex_unlock(&mddev->reconfig_mutex);
660 if (mddev->kobj.sd) {
661 if (to_remove != &md_redundancy_group)
662 sysfs_remove_group(&mddev->kobj, to_remove);
663 if (mddev->pers == NULL ||
664 mddev->pers->sync_request == NULL) {
665 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
666 if (mddev->sysfs_action)
667 sysfs_put(mddev->sysfs_action);
668 mddev->sysfs_action = NULL;
671 mddev->sysfs_active = 0;
673 mutex_unlock(&mddev->reconfig_mutex);
675 md_wakeup_thread(mddev->thread);
678 static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr)
682 list_for_each_entry(rdev, &mddev->disks, same_set)
683 if (rdev->desc_nr == nr)
689 static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev)
693 list_for_each_entry(rdev, &mddev->disks, same_set)
694 if (rdev->bdev->bd_dev == dev)
700 static struct mdk_personality *find_pers(int level, char *clevel)
702 struct mdk_personality *pers;
703 list_for_each_entry(pers, &pers_list, list) {
704 if (level != LEVEL_NONE && pers->level == level)
706 if (strcmp(pers->name, clevel)==0)
712 /* return the offset of the super block in 512byte sectors */
713 static inline sector_t calc_dev_sboffset(mdk_rdev_t *rdev)
715 sector_t num_sectors = i_size_read(rdev->bdev->bd_inode) / 512;
716 return MD_NEW_SIZE_SECTORS(num_sectors);
719 static int alloc_disk_sb(mdk_rdev_t * rdev)
724 rdev->sb_page = alloc_page(GFP_KERNEL);
725 if (!rdev->sb_page) {
726 printk(KERN_ALERT "md: out of memory.\n");
733 static void free_disk_sb(mdk_rdev_t * rdev)
736 put_page(rdev->sb_page);
738 rdev->sb_page = NULL;
745 static void super_written(struct bio *bio, int error)
747 mdk_rdev_t *rdev = bio->bi_private;
748 mddev_t *mddev = rdev->mddev;
750 if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) {
751 printk("md: super_written gets error=%d, uptodate=%d\n",
752 error, test_bit(BIO_UPTODATE, &bio->bi_flags));
753 WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags));
754 md_error(mddev, rdev);
757 if (atomic_dec_and_test(&mddev->pending_writes))
758 wake_up(&mddev->sb_wait);
762 void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
763 sector_t sector, int size, struct page *page)
765 /* write first size bytes of page to sector of rdev
766 * Increment mddev->pending_writes before returning
767 * and decrement it on completion, waking up sb_wait
768 * if zero is reached.
769 * If an error occurred, call md_error
771 struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, mddev);
773 bio->bi_bdev = rdev->meta_bdev ? rdev->meta_bdev : rdev->bdev;
774 bio->bi_sector = sector;
775 bio_add_page(bio, page, size, 0);
776 bio->bi_private = rdev;
777 bio->bi_end_io = super_written;
779 atomic_inc(&mddev->pending_writes);
780 submit_bio(REQ_WRITE | REQ_SYNC | REQ_FLUSH | REQ_FUA, bio);
783 void md_super_wait(mddev_t *mddev)
785 /* wait for all superblock writes that were scheduled to complete */
788 prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE);
789 if (atomic_read(&mddev->pending_writes)==0)
793 finish_wait(&mddev->sb_wait, &wq);
796 static void bi_complete(struct bio *bio, int error)
798 complete((struct completion*)bio->bi_private);
801 int sync_page_io(mdk_rdev_t *rdev, sector_t sector, int size,
802 struct page *page, int rw, bool metadata_op)
804 struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, rdev->mddev);
805 struct completion event;
810 bio->bi_bdev = (metadata_op && rdev->meta_bdev) ?
811 rdev->meta_bdev : rdev->bdev;
813 bio->bi_sector = sector + rdev->sb_start;
815 bio->bi_sector = sector + rdev->data_offset;
816 bio_add_page(bio, page, size, 0);
817 init_completion(&event);
818 bio->bi_private = &event;
819 bio->bi_end_io = bi_complete;
821 wait_for_completion(&event);
823 ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
827 EXPORT_SYMBOL_GPL(sync_page_io);
829 static int read_disk_sb(mdk_rdev_t * rdev, int size)
831 char b[BDEVNAME_SIZE];
832 if (!rdev->sb_page) {
840 if (!sync_page_io(rdev, 0, size, rdev->sb_page, READ, true))
846 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
847 bdevname(rdev->bdev,b));
851 static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
853 return sb1->set_uuid0 == sb2->set_uuid0 &&
854 sb1->set_uuid1 == sb2->set_uuid1 &&
855 sb1->set_uuid2 == sb2->set_uuid2 &&
856 sb1->set_uuid3 == sb2->set_uuid3;
859 static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
862 mdp_super_t *tmp1, *tmp2;
864 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
865 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
867 if (!tmp1 || !tmp2) {
869 printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n");
877 * nr_disks is not constant
882 ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0);
890 static u32 md_csum_fold(u32 csum)
892 csum = (csum & 0xffff) + (csum >> 16);
893 return (csum & 0xffff) + (csum >> 16);
896 static unsigned int calc_sb_csum(mdp_super_t * sb)
899 u32 *sb32 = (u32*)sb;
901 unsigned int disk_csum, csum;
903 disk_csum = sb->sb_csum;
906 for (i = 0; i < MD_SB_BYTES/4 ; i++)
908 csum = (newcsum & 0xffffffff) + (newcsum>>32);
912 /* This used to use csum_partial, which was wrong for several
913 * reasons including that different results are returned on
914 * different architectures. It isn't critical that we get exactly
915 * the same return value as before (we always csum_fold before
916 * testing, and that removes any differences). However as we
917 * know that csum_partial always returned a 16bit value on
918 * alphas, do a fold to maximise conformity to previous behaviour.
920 sb->sb_csum = md_csum_fold(disk_csum);
922 sb->sb_csum = disk_csum;
929 * Handle superblock details.
930 * We want to be able to handle multiple superblock formats
931 * so we have a common interface to them all, and an array of
932 * different handlers.
933 * We rely on user-space to write the initial superblock, and support
934 * reading and updating of superblocks.
935 * Interface methods are:
936 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
937 * loads and validates a superblock on dev.
938 * if refdev != NULL, compare superblocks on both devices
940 * 0 - dev has a superblock that is compatible with refdev
941 * 1 - dev has a superblock that is compatible and newer than refdev
942 * so dev should be used as the refdev in future
943 * -EINVAL superblock incompatible or invalid
944 * -othererror e.g. -EIO
946 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
947 * Verify that dev is acceptable into mddev.
948 * The first time, mddev->raid_disks will be 0, and data from
949 * dev should be merged in. Subsequent calls check that dev
950 * is new enough. Return 0 or -EINVAL
952 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
953 * Update the superblock for rdev with data in mddev
954 * This does not write to disc.
960 struct module *owner;
961 int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev,
963 int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev);
964 void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev);
965 unsigned long long (*rdev_size_change)(mdk_rdev_t *rdev,
966 sector_t num_sectors);
970 * Check that the given mddev has no bitmap.
972 * This function is called from the run method of all personalities that do not
973 * support bitmaps. It prints an error message and returns non-zero if mddev
974 * has a bitmap. Otherwise, it returns 0.
977 int md_check_no_bitmap(mddev_t *mddev)
979 if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset)
981 printk(KERN_ERR "%s: bitmaps are not supported for %s\n",
982 mdname(mddev), mddev->pers->name);
985 EXPORT_SYMBOL(md_check_no_bitmap);
988 * load_super for 0.90.0
990 static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
992 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
997 * Calculate the position of the superblock (512byte sectors),
998 * it's at the end of the disk.
1000 * It also happens to be a multiple of 4Kb.
1002 rdev->sb_start = calc_dev_sboffset(rdev);
1004 ret = read_disk_sb(rdev, MD_SB_BYTES);
1005 if (ret) return ret;
1009 bdevname(rdev->bdev, b);
1010 sb = (mdp_super_t*)page_address(rdev->sb_page);
1012 if (sb->md_magic != MD_SB_MAGIC) {
1013 printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
1018 if (sb->major_version != 0 ||
1019 sb->minor_version < 90 ||
1020 sb->minor_version > 91) {
1021 printk(KERN_WARNING "Bad version number %d.%d on %s\n",
1022 sb->major_version, sb->minor_version,
1027 if (sb->raid_disks <= 0)
1030 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
1031 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
1036 rdev->preferred_minor = sb->md_minor;
1037 rdev->data_offset = 0;
1038 rdev->sb_size = MD_SB_BYTES;
1040 if (sb->level == LEVEL_MULTIPATH)
1043 rdev->desc_nr = sb->this_disk.number;
1049 mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page);
1050 if (!uuid_equal(refsb, sb)) {
1051 printk(KERN_WARNING "md: %s has different UUID to %s\n",
1052 b, bdevname(refdev->bdev,b2));
1055 if (!sb_equal(refsb, sb)) {
1056 printk(KERN_WARNING "md: %s has same UUID"
1057 " but different superblock to %s\n",
1058 b, bdevname(refdev->bdev, b2));
1062 ev2 = md_event(refsb);
1068 rdev->sectors = rdev->sb_start;
1070 if (rdev->sectors < sb->size * 2 && sb->level > 1)
1071 /* "this cannot possibly happen" ... */
1079 * validate_super for 0.90.0
1081 static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
1084 mdp_super_t *sb = (mdp_super_t *)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(WriteMostly, &rdev->flags);
1092 if (mddev->raid_disks == 0) {
1093 mddev->major_version = 0;
1094 mddev->minor_version = sb->minor_version;
1095 mddev->patch_version = sb->patch_version;
1096 mddev->external = 0;
1097 mddev->chunk_sectors = sb->chunk_size >> 9;
1098 mddev->ctime = sb->ctime;
1099 mddev->utime = sb->utime;
1100 mddev->level = sb->level;
1101 mddev->clevel[0] = 0;
1102 mddev->layout = sb->layout;
1103 mddev->raid_disks = sb->raid_disks;
1104 mddev->dev_sectors = sb->size * 2;
1105 mddev->events = ev1;
1106 mddev->bitmap_info.offset = 0;
1107 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
1109 if (mddev->minor_version >= 91) {
1110 mddev->reshape_position = sb->reshape_position;
1111 mddev->delta_disks = sb->delta_disks;
1112 mddev->new_level = sb->new_level;
1113 mddev->new_layout = sb->new_layout;
1114 mddev->new_chunk_sectors = sb->new_chunk >> 9;
1116 mddev->reshape_position = MaxSector;
1117 mddev->delta_disks = 0;
1118 mddev->new_level = mddev->level;
1119 mddev->new_layout = mddev->layout;
1120 mddev->new_chunk_sectors = mddev->chunk_sectors;
1123 if (sb->state & (1<<MD_SB_CLEAN))
1124 mddev->recovery_cp = MaxSector;
1126 if (sb->events_hi == sb->cp_events_hi &&
1127 sb->events_lo == sb->cp_events_lo) {
1128 mddev->recovery_cp = sb->recovery_cp;
1130 mddev->recovery_cp = 0;
1133 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
1134 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
1135 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
1136 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
1138 mddev->max_disks = MD_SB_DISKS;
1140 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
1141 mddev->bitmap_info.file == NULL)
1142 mddev->bitmap_info.offset =
1143 mddev->bitmap_info.default_offset;
1145 } else if (mddev->pers == NULL) {
1146 /* Insist on good event counter while assembling, except
1147 * for spares (which don't need an event count) */
1149 if (sb->disks[rdev->desc_nr].state & (
1150 (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE)))
1151 if (ev1 < mddev->events)
1153 } else if (mddev->bitmap) {
1154 /* if adding to array with a bitmap, then we can accept an
1155 * older device ... but not too old.
1157 if (ev1 < mddev->bitmap->events_cleared)
1160 if (ev1 < mddev->events)
1161 /* just a hot-add of a new device, leave raid_disk at -1 */
1165 if (mddev->level != LEVEL_MULTIPATH) {
1166 desc = sb->disks + rdev->desc_nr;
1168 if (desc->state & (1<<MD_DISK_FAULTY))
1169 set_bit(Faulty, &rdev->flags);
1170 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
1171 desc->raid_disk < mddev->raid_disks */) {
1172 set_bit(In_sync, &rdev->flags);
1173 rdev->raid_disk = desc->raid_disk;
1174 } else if (desc->state & (1<<MD_DISK_ACTIVE)) {
1175 /* active but not in sync implies recovery up to
1176 * reshape position. We don't know exactly where
1177 * that is, so set to zero for now */
1178 if (mddev->minor_version >= 91) {
1179 rdev->recovery_offset = 0;
1180 rdev->raid_disk = desc->raid_disk;
1183 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
1184 set_bit(WriteMostly, &rdev->flags);
1185 } else /* MULTIPATH are always insync */
1186 set_bit(In_sync, &rdev->flags);
1191 * sync_super for 0.90.0
1193 static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1197 int next_spare = mddev->raid_disks;
1200 /* make rdev->sb match mddev data..
1203 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1204 * 3/ any empty disks < next_spare become removed
1206 * disks[0] gets initialised to REMOVED because
1207 * we cannot be sure from other fields if it has
1208 * been initialised or not.
1211 int active=0, working=0,failed=0,spare=0,nr_disks=0;
1213 rdev->sb_size = MD_SB_BYTES;
1215 sb = (mdp_super_t*)page_address(rdev->sb_page);
1217 memset(sb, 0, sizeof(*sb));
1219 sb->md_magic = MD_SB_MAGIC;
1220 sb->major_version = mddev->major_version;
1221 sb->patch_version = mddev->patch_version;
1222 sb->gvalid_words = 0; /* ignored */
1223 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
1224 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
1225 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
1226 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
1228 sb->ctime = mddev->ctime;
1229 sb->level = mddev->level;
1230 sb->size = mddev->dev_sectors / 2;
1231 sb->raid_disks = mddev->raid_disks;
1232 sb->md_minor = mddev->md_minor;
1233 sb->not_persistent = 0;
1234 sb->utime = mddev->utime;
1236 sb->events_hi = (mddev->events>>32);
1237 sb->events_lo = (u32)mddev->events;
1239 if (mddev->reshape_position == MaxSector)
1240 sb->minor_version = 90;
1242 sb->minor_version = 91;
1243 sb->reshape_position = mddev->reshape_position;
1244 sb->new_level = mddev->new_level;
1245 sb->delta_disks = mddev->delta_disks;
1246 sb->new_layout = mddev->new_layout;
1247 sb->new_chunk = mddev->new_chunk_sectors << 9;
1249 mddev->minor_version = sb->minor_version;
1252 sb->recovery_cp = mddev->recovery_cp;
1253 sb->cp_events_hi = (mddev->events>>32);
1254 sb->cp_events_lo = (u32)mddev->events;
1255 if (mddev->recovery_cp == MaxSector)
1256 sb->state = (1<< MD_SB_CLEAN);
1258 sb->recovery_cp = 0;
1260 sb->layout = mddev->layout;
1261 sb->chunk_size = mddev->chunk_sectors << 9;
1263 if (mddev->bitmap && mddev->bitmap_info.file == NULL)
1264 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
1266 sb->disks[0].state = (1<<MD_DISK_REMOVED);
1267 list_for_each_entry(rdev2, &mddev->disks, same_set) {
1270 int is_active = test_bit(In_sync, &rdev2->flags);
1272 if (rdev2->raid_disk >= 0 &&
1273 sb->minor_version >= 91)
1274 /* we have nowhere to store the recovery_offset,
1275 * but if it is not below the reshape_position,
1276 * we can piggy-back on that.
1279 if (rdev2->raid_disk < 0 ||
1280 test_bit(Faulty, &rdev2->flags))
1283 desc_nr = rdev2->raid_disk;
1285 desc_nr = next_spare++;
1286 rdev2->desc_nr = desc_nr;
1287 d = &sb->disks[rdev2->desc_nr];
1289 d->number = rdev2->desc_nr;
1290 d->major = MAJOR(rdev2->bdev->bd_dev);
1291 d->minor = MINOR(rdev2->bdev->bd_dev);
1293 d->raid_disk = rdev2->raid_disk;
1295 d->raid_disk = rdev2->desc_nr; /* compatibility */
1296 if (test_bit(Faulty, &rdev2->flags))
1297 d->state = (1<<MD_DISK_FAULTY);
1298 else if (is_active) {
1299 d->state = (1<<MD_DISK_ACTIVE);
1300 if (test_bit(In_sync, &rdev2->flags))
1301 d->state |= (1<<MD_DISK_SYNC);
1309 if (test_bit(WriteMostly, &rdev2->flags))
1310 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1312 /* now set the "removed" and "faulty" bits on any missing devices */
1313 for (i=0 ; i < mddev->raid_disks ; i++) {
1314 mdp_disk_t *d = &sb->disks[i];
1315 if (d->state == 0 && d->number == 0) {
1318 d->state = (1<<MD_DISK_REMOVED);
1319 d->state |= (1<<MD_DISK_FAULTY);
1323 sb->nr_disks = nr_disks;
1324 sb->active_disks = active;
1325 sb->working_disks = working;
1326 sb->failed_disks = failed;
1327 sb->spare_disks = spare;
1329 sb->this_disk = sb->disks[rdev->desc_nr];
1330 sb->sb_csum = calc_sb_csum(sb);
1334 * rdev_size_change for 0.90.0
1336 static unsigned long long
1337 super_90_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors)
1339 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1340 return 0; /* component must fit device */
1341 if (rdev->mddev->bitmap_info.offset)
1342 return 0; /* can't move bitmap */
1343 rdev->sb_start = calc_dev_sboffset(rdev);
1344 if (!num_sectors || num_sectors > rdev->sb_start)
1345 num_sectors = rdev->sb_start;
1346 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1348 md_super_wait(rdev->mddev);
1354 * version 1 superblock
1357 static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb)
1361 unsigned long long newcsum;
1362 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1363 __le32 *isuper = (__le32*)sb;
1366 disk_csum = sb->sb_csum;
1369 for (i=0; size>=4; size -= 4 )
1370 newcsum += le32_to_cpu(*isuper++);
1373 newcsum += le16_to_cpu(*(__le16*) isuper);
1375 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1376 sb->sb_csum = disk_csum;
1377 return cpu_to_le32(csum);
1380 static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
1382 struct mdp_superblock_1 *sb;
1385 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1389 * Calculate the position of the superblock in 512byte sectors.
1390 * It is always aligned to a 4K boundary and
1391 * depeding on minor_version, it can be:
1392 * 0: At least 8K, but less than 12K, from end of device
1393 * 1: At start of device
1394 * 2: 4K from start of device.
1396 switch(minor_version) {
1398 sb_start = i_size_read(rdev->bdev->bd_inode) >> 9;
1400 sb_start &= ~(sector_t)(4*2-1);
1411 rdev->sb_start = sb_start;
1413 /* superblock is rarely larger than 1K, but it can be larger,
1414 * and it is safe to read 4k, so we do that
1416 ret = read_disk_sb(rdev, 4096);
1417 if (ret) return ret;
1420 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1422 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1423 sb->major_version != cpu_to_le32(1) ||
1424 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1425 le64_to_cpu(sb->super_offset) != rdev->sb_start ||
1426 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1429 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1430 printk("md: invalid superblock checksum on %s\n",
1431 bdevname(rdev->bdev,b));
1434 if (le64_to_cpu(sb->data_size) < 10) {
1435 printk("md: data_size too small on %s\n",
1436 bdevname(rdev->bdev,b));
1440 rdev->preferred_minor = 0xffff;
1441 rdev->data_offset = le64_to_cpu(sb->data_offset);
1442 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1444 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1445 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1446 if (rdev->sb_size & bmask)
1447 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1450 && rdev->data_offset < sb_start + (rdev->sb_size/512))
1453 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1456 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1462 struct mdp_superblock_1 *refsb =
1463 (struct mdp_superblock_1*)page_address(refdev->sb_page);
1465 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1466 sb->level != refsb->level ||
1467 sb->layout != refsb->layout ||
1468 sb->chunksize != refsb->chunksize) {
1469 printk(KERN_WARNING "md: %s has strangely different"
1470 " superblock to %s\n",
1471 bdevname(rdev->bdev,b),
1472 bdevname(refdev->bdev,b2));
1475 ev1 = le64_to_cpu(sb->events);
1476 ev2 = le64_to_cpu(refsb->events);
1484 rdev->sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) -
1485 le64_to_cpu(sb->data_offset);
1487 rdev->sectors = rdev->sb_start;
1488 if (rdev->sectors < le64_to_cpu(sb->data_size))
1490 rdev->sectors = le64_to_cpu(sb->data_size);
1491 if (le64_to_cpu(sb->size) > rdev->sectors)
1496 static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
1498 struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1499 __u64 ev1 = le64_to_cpu(sb->events);
1501 rdev->raid_disk = -1;
1502 clear_bit(Faulty, &rdev->flags);
1503 clear_bit(In_sync, &rdev->flags);
1504 clear_bit(WriteMostly, &rdev->flags);
1506 if (mddev->raid_disks == 0) {
1507 mddev->major_version = 1;
1508 mddev->patch_version = 0;
1509 mddev->external = 0;
1510 mddev->chunk_sectors = le32_to_cpu(sb->chunksize);
1511 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1512 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1513 mddev->level = le32_to_cpu(sb->level);
1514 mddev->clevel[0] = 0;
1515 mddev->layout = le32_to_cpu(sb->layout);
1516 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1517 mddev->dev_sectors = le64_to_cpu(sb->size);
1518 mddev->events = ev1;
1519 mddev->bitmap_info.offset = 0;
1520 mddev->bitmap_info.default_offset = 1024 >> 9;
1522 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1523 memcpy(mddev->uuid, sb->set_uuid, 16);
1525 mddev->max_disks = (4096-256)/2;
1527 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1528 mddev->bitmap_info.file == NULL )
1529 mddev->bitmap_info.offset =
1530 (__s32)le32_to_cpu(sb->bitmap_offset);
1532 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1533 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1534 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1535 mddev->new_level = le32_to_cpu(sb->new_level);
1536 mddev->new_layout = le32_to_cpu(sb->new_layout);
1537 mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk);
1539 mddev->reshape_position = MaxSector;
1540 mddev->delta_disks = 0;
1541 mddev->new_level = mddev->level;
1542 mddev->new_layout = mddev->layout;
1543 mddev->new_chunk_sectors = mddev->chunk_sectors;
1546 } else if (mddev->pers == NULL) {
1547 /* Insist of good event counter while assembling, except for
1548 * spares (which don't need an event count) */
1550 if (rdev->desc_nr >= 0 &&
1551 rdev->desc_nr < le32_to_cpu(sb->max_dev) &&
1552 le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < 0xfffe)
1553 if (ev1 < mddev->events)
1555 } else if (mddev->bitmap) {
1556 /* If adding to array with a bitmap, then we can accept an
1557 * older device, but not too old.
1559 if (ev1 < mddev->bitmap->events_cleared)
1562 if (ev1 < mddev->events)
1563 /* just a hot-add of a new device, leave raid_disk at -1 */
1566 if (mddev->level != LEVEL_MULTIPATH) {
1568 if (rdev->desc_nr < 0 ||
1569 rdev->desc_nr >= le32_to_cpu(sb->max_dev)) {
1573 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1575 case 0xffff: /* spare */
1577 case 0xfffe: /* faulty */
1578 set_bit(Faulty, &rdev->flags);
1581 if ((le32_to_cpu(sb->feature_map) &
1582 MD_FEATURE_RECOVERY_OFFSET))
1583 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1585 set_bit(In_sync, &rdev->flags);
1586 rdev->raid_disk = role;
1589 if (sb->devflags & WriteMostly1)
1590 set_bit(WriteMostly, &rdev->flags);
1591 } else /* MULTIPATH are always insync */
1592 set_bit(In_sync, &rdev->flags);
1597 static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1599 struct mdp_superblock_1 *sb;
1602 /* make rdev->sb match mddev and rdev data. */
1604 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1606 sb->feature_map = 0;
1608 sb->recovery_offset = cpu_to_le64(0);
1609 memset(sb->pad1, 0, sizeof(sb->pad1));
1610 memset(sb->pad2, 0, sizeof(sb->pad2));
1611 memset(sb->pad3, 0, sizeof(sb->pad3));
1613 sb->utime = cpu_to_le64((__u64)mddev->utime);
1614 sb->events = cpu_to_le64(mddev->events);
1616 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1618 sb->resync_offset = cpu_to_le64(0);
1620 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
1622 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
1623 sb->size = cpu_to_le64(mddev->dev_sectors);
1624 sb->chunksize = cpu_to_le32(mddev->chunk_sectors);
1625 sb->level = cpu_to_le32(mddev->level);
1626 sb->layout = cpu_to_le32(mddev->layout);
1628 if (mddev->bitmap && mddev->bitmap_info.file == NULL) {
1629 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset);
1630 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
1633 if (rdev->raid_disk >= 0 &&
1634 !test_bit(In_sync, &rdev->flags)) {
1636 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1637 sb->recovery_offset =
1638 cpu_to_le64(rdev->recovery_offset);
1641 if (mddev->reshape_position != MaxSector) {
1642 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1643 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1644 sb->new_layout = cpu_to_le32(mddev->new_layout);
1645 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1646 sb->new_level = cpu_to_le32(mddev->new_level);
1647 sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors);
1651 list_for_each_entry(rdev2, &mddev->disks, same_set)
1652 if (rdev2->desc_nr+1 > max_dev)
1653 max_dev = rdev2->desc_nr+1;
1655 if (max_dev > le32_to_cpu(sb->max_dev)) {
1657 sb->max_dev = cpu_to_le32(max_dev);
1658 rdev->sb_size = max_dev * 2 + 256;
1659 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1660 if (rdev->sb_size & bmask)
1661 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1663 max_dev = le32_to_cpu(sb->max_dev);
1665 for (i=0; i<max_dev;i++)
1666 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1668 list_for_each_entry(rdev2, &mddev->disks, same_set) {
1670 if (test_bit(Faulty, &rdev2->flags))
1671 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1672 else if (test_bit(In_sync, &rdev2->flags))
1673 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1674 else if (rdev2->raid_disk >= 0)
1675 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1677 sb->dev_roles[i] = cpu_to_le16(0xffff);
1680 sb->sb_csum = calc_sb_1_csum(sb);
1683 static unsigned long long
1684 super_1_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors)
1686 struct mdp_superblock_1 *sb;
1687 sector_t max_sectors;
1688 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1689 return 0; /* component must fit device */
1690 if (rdev->sb_start < rdev->data_offset) {
1691 /* minor versions 1 and 2; superblock before data */
1692 max_sectors = i_size_read(rdev->bdev->bd_inode) >> 9;
1693 max_sectors -= rdev->data_offset;
1694 if (!num_sectors || num_sectors > max_sectors)
1695 num_sectors = max_sectors;
1696 } else if (rdev->mddev->bitmap_info.offset) {
1697 /* minor version 0 with bitmap we can't move */
1700 /* minor version 0; superblock after data */
1702 sb_start = (i_size_read(rdev->bdev->bd_inode) >> 9) - 8*2;
1703 sb_start &= ~(sector_t)(4*2 - 1);
1704 max_sectors = rdev->sectors + sb_start - rdev->sb_start;
1705 if (!num_sectors || num_sectors > max_sectors)
1706 num_sectors = max_sectors;
1707 rdev->sb_start = sb_start;
1709 sb = (struct mdp_superblock_1 *) page_address(rdev->sb_page);
1710 sb->data_size = cpu_to_le64(num_sectors);
1711 sb->super_offset = rdev->sb_start;
1712 sb->sb_csum = calc_sb_1_csum(sb);
1713 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1715 md_super_wait(rdev->mddev);
1719 static struct super_type super_types[] = {
1722 .owner = THIS_MODULE,
1723 .load_super = super_90_load,
1724 .validate_super = super_90_validate,
1725 .sync_super = super_90_sync,
1726 .rdev_size_change = super_90_rdev_size_change,
1730 .owner = THIS_MODULE,
1731 .load_super = super_1_load,
1732 .validate_super = super_1_validate,
1733 .sync_super = super_1_sync,
1734 .rdev_size_change = super_1_rdev_size_change,
1738 static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)
1740 mdk_rdev_t *rdev, *rdev2;
1743 rdev_for_each_rcu(rdev, mddev1)
1744 rdev_for_each_rcu(rdev2, mddev2)
1745 if (rdev->bdev->bd_contains ==
1746 rdev2->bdev->bd_contains) {
1754 static LIST_HEAD(pending_raid_disks);
1757 * Try to register data integrity profile for an mddev
1759 * This is called when an array is started and after a disk has been kicked
1760 * from the array. It only succeeds if all working and active component devices
1761 * are integrity capable with matching profiles.
1763 int md_integrity_register(mddev_t *mddev)
1765 mdk_rdev_t *rdev, *reference = NULL;
1767 if (list_empty(&mddev->disks))
1768 return 0; /* nothing to do */
1769 if (blk_get_integrity(mddev->gendisk))
1770 return 0; /* already registered */
1771 list_for_each_entry(rdev, &mddev->disks, same_set) {
1772 /* skip spares and non-functional disks */
1773 if (test_bit(Faulty, &rdev->flags))
1775 if (rdev->raid_disk < 0)
1778 * If at least one rdev is not integrity capable, we can not
1779 * enable data integrity for the md device.
1781 if (!bdev_get_integrity(rdev->bdev))
1784 /* Use the first rdev as the reference */
1788 /* does this rdev's profile match the reference profile? */
1789 if (blk_integrity_compare(reference->bdev->bd_disk,
1790 rdev->bdev->bd_disk) < 0)
1794 * All component devices are integrity capable and have matching
1795 * profiles, register the common profile for the md device.
1797 if (blk_integrity_register(mddev->gendisk,
1798 bdev_get_integrity(reference->bdev)) != 0) {
1799 printk(KERN_ERR "md: failed to register integrity for %s\n",
1803 printk(KERN_NOTICE "md: data integrity on %s enabled\n",
1807 EXPORT_SYMBOL(md_integrity_register);
1809 /* Disable data integrity if non-capable/non-matching disk is being added */
1810 void md_integrity_add_rdev(mdk_rdev_t *rdev, mddev_t *mddev)
1812 struct blk_integrity *bi_rdev = bdev_get_integrity(rdev->bdev);
1813 struct blk_integrity *bi_mddev = blk_get_integrity(mddev->gendisk);
1815 if (!bi_mddev) /* nothing to do */
1817 if (rdev->raid_disk < 0) /* skip spares */
1819 if (bi_rdev && blk_integrity_compare(mddev->gendisk,
1820 rdev->bdev->bd_disk) >= 0)
1822 printk(KERN_NOTICE "disabling data integrity on %s\n", mdname(mddev));
1823 blk_integrity_unregister(mddev->gendisk);
1825 EXPORT_SYMBOL(md_integrity_add_rdev);
1827 static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
1829 char b[BDEVNAME_SIZE];
1839 /* prevent duplicates */
1840 if (find_rdev(mddev, rdev->bdev->bd_dev))
1843 /* make sure rdev->sectors exceeds mddev->dev_sectors */
1844 if (rdev->sectors && (mddev->dev_sectors == 0 ||
1845 rdev->sectors < mddev->dev_sectors)) {
1847 /* Cannot change size, so fail
1848 * If mddev->level <= 0, then we don't care
1849 * about aligning sizes (e.g. linear)
1851 if (mddev->level > 0)
1854 mddev->dev_sectors = rdev->sectors;
1857 /* Verify rdev->desc_nr is unique.
1858 * If it is -1, assign a free number, else
1859 * check number is not in use
1861 if (rdev->desc_nr < 0) {
1863 if (mddev->pers) choice = mddev->raid_disks;
1864 while (find_rdev_nr(mddev, choice))
1866 rdev->desc_nr = choice;
1868 if (find_rdev_nr(mddev, rdev->desc_nr))
1871 if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) {
1872 printk(KERN_WARNING "md: %s: array is limited to %d devices\n",
1873 mdname(mddev), mddev->max_disks);
1876 bdevname(rdev->bdev,b);
1877 while ( (s=strchr(b, '/')) != NULL)
1880 rdev->mddev = mddev;
1881 printk(KERN_INFO "md: bind<%s>\n", b);
1883 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
1886 ko = &part_to_dev(rdev->bdev->bd_part)->kobj;
1887 if (sysfs_create_link(&rdev->kobj, ko, "block"))
1888 /* failure here is OK */;
1889 rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state");
1891 list_add_rcu(&rdev->same_set, &mddev->disks);
1892 bd_link_disk_holder(rdev->bdev, mddev->gendisk);
1894 /* May as well allow recovery to be retried once */
1895 mddev->recovery_disabled = 0;
1900 printk(KERN_WARNING "md: failed to register dev-%s for %s\n",
1905 static void md_delayed_delete(struct work_struct *ws)
1907 mdk_rdev_t *rdev = container_of(ws, mdk_rdev_t, del_work);
1908 kobject_del(&rdev->kobj);
1909 kobject_put(&rdev->kobj);
1912 static void unbind_rdev_from_array(mdk_rdev_t * rdev)
1914 char b[BDEVNAME_SIZE];
1919 bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk);
1920 list_del_rcu(&rdev->same_set);
1921 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
1923 sysfs_remove_link(&rdev->kobj, "block");
1924 sysfs_put(rdev->sysfs_state);
1925 rdev->sysfs_state = NULL;
1926 /* We need to delay this, otherwise we can deadlock when
1927 * writing to 'remove' to "dev/state". We also need
1928 * to delay it due to rcu usage.
1931 INIT_WORK(&rdev->del_work, md_delayed_delete);
1932 kobject_get(&rdev->kobj);
1933 queue_work(md_misc_wq, &rdev->del_work);
1937 * prevent the device from being mounted, repartitioned or
1938 * otherwise reused by a RAID array (or any other kernel
1939 * subsystem), by bd_claiming the device.
1941 static int lock_rdev(mdk_rdev_t *rdev, dev_t dev, int shared)
1944 struct block_device *bdev;
1945 char b[BDEVNAME_SIZE];
1947 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
1948 shared ? (mdk_rdev_t *)lock_rdev : rdev);
1950 printk(KERN_ERR "md: could not open %s.\n",
1951 __bdevname(dev, b));
1952 return PTR_ERR(bdev);
1958 static void unlock_rdev(mdk_rdev_t *rdev)
1960 struct block_device *bdev = rdev->bdev;
1964 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
1967 void md_autodetect_dev(dev_t dev);
1969 static void export_rdev(mdk_rdev_t * rdev)
1971 char b[BDEVNAME_SIZE];
1972 printk(KERN_INFO "md: export_rdev(%s)\n",
1973 bdevname(rdev->bdev,b));
1978 if (test_bit(AutoDetected, &rdev->flags))
1979 md_autodetect_dev(rdev->bdev->bd_dev);
1982 kobject_put(&rdev->kobj);
1985 static void kick_rdev_from_array(mdk_rdev_t * rdev)
1987 unbind_rdev_from_array(rdev);
1991 static void export_array(mddev_t *mddev)
1993 mdk_rdev_t *rdev, *tmp;
1995 rdev_for_each(rdev, tmp, mddev) {
2000 kick_rdev_from_array(rdev);
2002 if (!list_empty(&mddev->disks))
2004 mddev->raid_disks = 0;
2005 mddev->major_version = 0;
2008 static void print_desc(mdp_disk_t *desc)
2010 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
2011 desc->major,desc->minor,desc->raid_disk,desc->state);
2014 static void print_sb_90(mdp_super_t *sb)
2019 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
2020 sb->major_version, sb->minor_version, sb->patch_version,
2021 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
2023 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
2024 sb->level, sb->size, sb->nr_disks, sb->raid_disks,
2025 sb->md_minor, sb->layout, sb->chunk_size);
2026 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
2027 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
2028 sb->utime, sb->state, sb->active_disks, sb->working_disks,
2029 sb->failed_disks, sb->spare_disks,
2030 sb->sb_csum, (unsigned long)sb->events_lo);
2033 for (i = 0; i < MD_SB_DISKS; i++) {
2036 desc = sb->disks + i;
2037 if (desc->number || desc->major || desc->minor ||
2038 desc->raid_disk || (desc->state && (desc->state != 4))) {
2039 printk(" D %2d: ", i);
2043 printk(KERN_INFO "md: THIS: ");
2044 print_desc(&sb->this_disk);
2047 static void print_sb_1(struct mdp_superblock_1 *sb)
2051 uuid = sb->set_uuid;
2053 "md: SB: (V:%u) (F:0x%08x) Array-ID:<%pU>\n"
2054 "md: Name: \"%s\" CT:%llu\n",
2055 le32_to_cpu(sb->major_version),
2056 le32_to_cpu(sb->feature_map),
2059 (unsigned long long)le64_to_cpu(sb->ctime)
2060 & MD_SUPERBLOCK_1_TIME_SEC_MASK);
2062 uuid = sb->device_uuid;
2064 "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu"
2066 "md: Dev:%08x UUID: %pU\n"
2067 "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n"
2068 "md: (MaxDev:%u) \n",
2069 le32_to_cpu(sb->level),
2070 (unsigned long long)le64_to_cpu(sb->size),
2071 le32_to_cpu(sb->raid_disks),
2072 le32_to_cpu(sb->layout),
2073 le32_to_cpu(sb->chunksize),
2074 (unsigned long long)le64_to_cpu(sb->data_offset),
2075 (unsigned long long)le64_to_cpu(sb->data_size),
2076 (unsigned long long)le64_to_cpu(sb->super_offset),
2077 (unsigned long long)le64_to_cpu(sb->recovery_offset),
2078 le32_to_cpu(sb->dev_number),
2081 (unsigned long long)le64_to_cpu(sb->utime) & MD_SUPERBLOCK_1_TIME_SEC_MASK,
2082 (unsigned long long)le64_to_cpu(sb->events),
2083 (unsigned long long)le64_to_cpu(sb->resync_offset),
2084 le32_to_cpu(sb->sb_csum),
2085 le32_to_cpu(sb->max_dev)
2089 static void print_rdev(mdk_rdev_t *rdev, int major_version)
2091 char b[BDEVNAME_SIZE];
2092 printk(KERN_INFO "md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n",
2093 bdevname(rdev->bdev, b), (unsigned long long)rdev->sectors,
2094 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
2096 if (rdev->sb_loaded) {
2097 printk(KERN_INFO "md: rdev superblock (MJ:%d):\n", major_version);
2098 switch (major_version) {
2100 print_sb_90((mdp_super_t*)page_address(rdev->sb_page));
2103 print_sb_1((struct mdp_superblock_1 *)page_address(rdev->sb_page));
2107 printk(KERN_INFO "md: no rdev superblock!\n");
2110 static void md_print_devices(void)
2112 struct list_head *tmp;
2115 char b[BDEVNAME_SIZE];
2118 printk("md: **********************************\n");
2119 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
2120 printk("md: **********************************\n");
2121 for_each_mddev(mddev, tmp) {
2124 bitmap_print_sb(mddev->bitmap);
2126 printk("%s: ", mdname(mddev));
2127 list_for_each_entry(rdev, &mddev->disks, same_set)
2128 printk("<%s>", bdevname(rdev->bdev,b));
2131 list_for_each_entry(rdev, &mddev->disks, same_set)
2132 print_rdev(rdev, mddev->major_version);
2134 printk("md: **********************************\n");
2139 static void sync_sbs(mddev_t * mddev, int nospares)
2141 /* Update each superblock (in-memory image), but
2142 * if we are allowed to, skip spares which already
2143 * have the right event counter, or have one earlier
2144 * (which would mean they aren't being marked as dirty
2145 * with the rest of the array)
2148 list_for_each_entry(rdev, &mddev->disks, same_set) {
2149 if (rdev->sb_events == mddev->events ||
2151 rdev->raid_disk < 0 &&
2152 rdev->sb_events+1 == mddev->events)) {
2153 /* Don't update this superblock */
2154 rdev->sb_loaded = 2;
2156 super_types[mddev->major_version].
2157 sync_super(mddev, rdev);
2158 rdev->sb_loaded = 1;
2163 static void md_update_sb(mddev_t * mddev, int force_change)
2170 /* First make sure individual recovery_offsets are correct */
2171 list_for_each_entry(rdev, &mddev->disks, same_set) {
2172 if (rdev->raid_disk >= 0 &&
2173 mddev->delta_disks >= 0 &&
2174 !test_bit(In_sync, &rdev->flags) &&
2175 mddev->curr_resync_completed > rdev->recovery_offset)
2176 rdev->recovery_offset = mddev->curr_resync_completed;
2179 if (!mddev->persistent) {
2180 clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
2181 clear_bit(MD_CHANGE_DEVS, &mddev->flags);
2182 if (!mddev->external)
2183 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2184 wake_up(&mddev->sb_wait);
2188 spin_lock_irq(&mddev->write_lock);
2190 mddev->utime = get_seconds();
2192 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
2194 if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags))
2195 /* just a clean<-> dirty transition, possibly leave spares alone,
2196 * though if events isn't the right even/odd, we will have to do
2202 if (mddev->degraded)
2203 /* If the array is degraded, then skipping spares is both
2204 * dangerous and fairly pointless.
2205 * Dangerous because a device that was removed from the array
2206 * might have a event_count that still looks up-to-date,
2207 * so it can be re-added without a resync.
2208 * Pointless because if there are any spares to skip,
2209 * then a recovery will happen and soon that array won't
2210 * be degraded any more and the spare can go back to sleep then.
2214 sync_req = mddev->in_sync;
2216 /* If this is just a dirty<->clean transition, and the array is clean
2217 * and 'events' is odd, we can roll back to the previous clean state */
2219 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
2220 && mddev->can_decrease_events
2221 && mddev->events != 1) {
2223 mddev->can_decrease_events = 0;
2225 /* otherwise we have to go forward and ... */
2227 mddev->can_decrease_events = nospares;
2230 if (!mddev->events) {
2232 * oops, this 64-bit counter should never wrap.
2233 * Either we are in around ~1 trillion A.C., assuming
2234 * 1 reboot per second, or we have a bug:
2239 sync_sbs(mddev, nospares);
2240 spin_unlock_irq(&mddev->write_lock);
2243 "md: updating %s RAID superblock on device (in sync %d)\n",
2244 mdname(mddev),mddev->in_sync);
2246 bitmap_update_sb(mddev->bitmap);
2247 list_for_each_entry(rdev, &mddev->disks, same_set) {
2248 char b[BDEVNAME_SIZE];
2249 dprintk(KERN_INFO "md: ");
2250 if (rdev->sb_loaded != 1)
2251 continue; /* no noise on spare devices */
2252 if (test_bit(Faulty, &rdev->flags))
2253 dprintk("(skipping faulty ");
2255 dprintk("%s ", bdevname(rdev->bdev,b));
2256 if (!test_bit(Faulty, &rdev->flags)) {
2257 md_super_write(mddev,rdev,
2258 rdev->sb_start, rdev->sb_size,
2260 dprintk(KERN_INFO "(write) %s's sb offset: %llu\n",
2261 bdevname(rdev->bdev,b),
2262 (unsigned long long)rdev->sb_start);
2263 rdev->sb_events = mddev->events;
2267 if (mddev->level == LEVEL_MULTIPATH)
2268 /* only need to write one superblock... */
2271 md_super_wait(mddev);
2272 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2274 spin_lock_irq(&mddev->write_lock);
2275 if (mddev->in_sync != sync_req ||
2276 test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
2277 /* have to write it out again */
2278 spin_unlock_irq(&mddev->write_lock);
2281 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2282 spin_unlock_irq(&mddev->write_lock);
2283 wake_up(&mddev->sb_wait);
2284 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
2285 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
2289 /* words written to sysfs files may, or may not, be \n terminated.
2290 * We want to accept with case. For this we use cmd_match.
2292 static int cmd_match(const char *cmd, const char *str)
2294 /* See if cmd, written into a sysfs file, matches
2295 * str. They must either be the same, or cmd can
2296 * have a trailing newline
2298 while (*cmd && *str && *cmd == *str) {
2309 struct rdev_sysfs_entry {
2310 struct attribute attr;
2311 ssize_t (*show)(mdk_rdev_t *, char *);
2312 ssize_t (*store)(mdk_rdev_t *, const char *, size_t);
2316 state_show(mdk_rdev_t *rdev, char *page)
2321 if (test_bit(Faulty, &rdev->flags)) {
2322 len+= sprintf(page+len, "%sfaulty",sep);
2325 if (test_bit(In_sync, &rdev->flags)) {
2326 len += sprintf(page+len, "%sin_sync",sep);
2329 if (test_bit(WriteMostly, &rdev->flags)) {
2330 len += sprintf(page+len, "%swrite_mostly",sep);
2333 if (test_bit(Blocked, &rdev->flags)) {
2334 len += sprintf(page+len, "%sblocked", sep);
2337 if (!test_bit(Faulty, &rdev->flags) &&
2338 !test_bit(In_sync, &rdev->flags)) {
2339 len += sprintf(page+len, "%sspare", sep);
2342 return len+sprintf(page+len, "\n");
2346 state_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2349 * faulty - simulates and error
2350 * remove - disconnects the device
2351 * writemostly - sets write_mostly
2352 * -writemostly - clears write_mostly
2353 * blocked - sets the Blocked flag
2354 * -blocked - clears the Blocked flag
2355 * insync - sets Insync providing device isn't active
2358 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
2359 md_error(rdev->mddev, rdev);
2361 } else if (cmd_match(buf, "remove")) {
2362 if (rdev->raid_disk >= 0)
2365 mddev_t *mddev = rdev->mddev;
2366 kick_rdev_from_array(rdev);
2368 md_update_sb(mddev, 1);
2369 md_new_event(mddev);
2372 } else if (cmd_match(buf, "writemostly")) {
2373 set_bit(WriteMostly, &rdev->flags);
2375 } else if (cmd_match(buf, "-writemostly")) {
2376 clear_bit(WriteMostly, &rdev->flags);
2378 } else if (cmd_match(buf, "blocked")) {
2379 set_bit(Blocked, &rdev->flags);
2381 } else if (cmd_match(buf, "-blocked")) {
2382 clear_bit(Blocked, &rdev->flags);
2383 wake_up(&rdev->blocked_wait);
2384 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2385 md_wakeup_thread(rdev->mddev->thread);
2388 } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) {
2389 set_bit(In_sync, &rdev->flags);
2393 sysfs_notify_dirent_safe(rdev->sysfs_state);
2394 return err ? err : len;
2396 static struct rdev_sysfs_entry rdev_state =
2397 __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store);
2400 errors_show(mdk_rdev_t *rdev, char *page)
2402 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
2406 errors_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2409 unsigned long n = simple_strtoul(buf, &e, 10);
2410 if (*buf && (*e == 0 || *e == '\n')) {
2411 atomic_set(&rdev->corrected_errors, n);
2416 static struct rdev_sysfs_entry rdev_errors =
2417 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
2420 slot_show(mdk_rdev_t *rdev, char *page)
2422 if (rdev->raid_disk < 0)
2423 return sprintf(page, "none\n");
2425 return sprintf(page, "%d\n", rdev->raid_disk);
2429 slot_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2434 int slot = simple_strtoul(buf, &e, 10);
2435 if (strncmp(buf, "none", 4)==0)
2437 else if (e==buf || (*e && *e!= '\n'))
2439 if (rdev->mddev->pers && slot == -1) {
2440 /* Setting 'slot' on an active array requires also
2441 * updating the 'rd%d' link, and communicating
2442 * with the personality with ->hot_*_disk.
2443 * For now we only support removing
2444 * failed/spare devices. This normally happens automatically,
2445 * but not when the metadata is externally managed.
2447 if (rdev->raid_disk == -1)
2449 /* personality does all needed checks */
2450 if (rdev->mddev->pers->hot_add_disk == NULL)
2452 err = rdev->mddev->pers->
2453 hot_remove_disk(rdev->mddev, rdev->raid_disk);
2456 sprintf(nm, "rd%d", rdev->raid_disk);
2457 sysfs_remove_link(&rdev->mddev->kobj, nm);
2458 rdev->raid_disk = -1;
2459 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2460 md_wakeup_thread(rdev->mddev->thread);
2461 } else if (rdev->mddev->pers) {
2463 /* Activating a spare .. or possibly reactivating
2464 * if we ever get bitmaps working here.
2467 if (rdev->raid_disk != -1)
2470 if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery))
2473 if (rdev->mddev->pers->hot_add_disk == NULL)
2476 list_for_each_entry(rdev2, &rdev->mddev->disks, same_set)
2477 if (rdev2->raid_disk == slot)
2480 if (slot >= rdev->mddev->raid_disks &&
2481 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
2484 rdev->raid_disk = slot;
2485 if (test_bit(In_sync, &rdev->flags))
2486 rdev->saved_raid_disk = slot;
2488 rdev->saved_raid_disk = -1;
2489 err = rdev->mddev->pers->
2490 hot_add_disk(rdev->mddev, rdev);
2492 rdev->raid_disk = -1;
2495 sysfs_notify_dirent_safe(rdev->sysfs_state);
2496 sprintf(nm, "rd%d", rdev->raid_disk);
2497 if (sysfs_create_link(&rdev->mddev->kobj, &rdev->kobj, nm))
2498 /* failure here is OK */;
2499 /* don't wakeup anyone, leave that to userspace. */
2501 if (slot >= rdev->mddev->raid_disks &&
2502 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
2504 rdev->raid_disk = slot;
2505 /* assume it is working */
2506 clear_bit(Faulty, &rdev->flags);
2507 clear_bit(WriteMostly, &rdev->flags);
2508 set_bit(In_sync, &rdev->flags);
2509 sysfs_notify_dirent_safe(rdev->sysfs_state);
2515 static struct rdev_sysfs_entry rdev_slot =
2516 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
2519 offset_show(mdk_rdev_t *rdev, char *page)
2521 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
2525 offset_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2528 unsigned long long offset = simple_strtoull(buf, &e, 10);
2529 if (e==buf || (*e && *e != '\n'))
2531 if (rdev->mddev->pers && rdev->raid_disk >= 0)
2533 if (rdev->sectors && rdev->mddev->external)
2534 /* Must set offset before size, so overlap checks
2537 rdev->data_offset = offset;
2541 static struct rdev_sysfs_entry rdev_offset =
2542 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
2545 rdev_size_show(mdk_rdev_t *rdev, char *page)
2547 return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2);
2550 static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
2552 /* check if two start/length pairs overlap */
2560 static int strict_blocks_to_sectors(const char *buf, sector_t *sectors)
2562 unsigned long long blocks;
2565 if (strict_strtoull(buf, 10, &blocks) < 0)
2568 if (blocks & 1ULL << (8 * sizeof(blocks) - 1))
2569 return -EINVAL; /* sector conversion overflow */
2572 if (new != blocks * 2)
2573 return -EINVAL; /* unsigned long long to sector_t overflow */
2580 rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2582 mddev_t *my_mddev = rdev->mddev;
2583 sector_t oldsectors = rdev->sectors;
2586 if (strict_blocks_to_sectors(buf, §ors) < 0)
2588 if (my_mddev->pers && rdev->raid_disk >= 0) {
2589 if (my_mddev->persistent) {
2590 sectors = super_types[my_mddev->major_version].
2591 rdev_size_change(rdev, sectors);
2594 } else if (!sectors)
2595 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) -
2598 if (sectors < my_mddev->dev_sectors)
2599 return -EINVAL; /* component must fit device */
2601 rdev->sectors = sectors;
2602 if (sectors > oldsectors && my_mddev->external) {
2603 /* need to check that all other rdevs with the same ->bdev
2604 * do not overlap. We need to unlock the mddev to avoid
2605 * a deadlock. We have already changed rdev->sectors, and if
2606 * we have to change it back, we will have the lock again.
2610 struct list_head *tmp;
2612 mddev_unlock(my_mddev);
2613 for_each_mddev(mddev, tmp) {
2617 list_for_each_entry(rdev2, &mddev->disks, same_set)
2618 if (rdev->bdev == rdev2->bdev &&
2620 overlaps(rdev->data_offset, rdev->sectors,
2626 mddev_unlock(mddev);
2632 mddev_lock(my_mddev);
2634 /* Someone else could have slipped in a size
2635 * change here, but doing so is just silly.
2636 * We put oldsectors back because we *know* it is
2637 * safe, and trust userspace not to race with
2640 rdev->sectors = oldsectors;
2647 static struct rdev_sysfs_entry rdev_size =
2648 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
2651 static ssize_t recovery_start_show(mdk_rdev_t *rdev, char *page)
2653 unsigned long long recovery_start = rdev->recovery_offset;
2655 if (test_bit(In_sync, &rdev->flags) ||
2656 recovery_start == MaxSector)
2657 return sprintf(page, "none\n");
2659 return sprintf(page, "%llu\n", recovery_start);
2662 static ssize_t recovery_start_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2664 unsigned long long recovery_start;
2666 if (cmd_match(buf, "none"))
2667 recovery_start = MaxSector;
2668 else if (strict_strtoull(buf, 10, &recovery_start))
2671 if (rdev->mddev->pers &&
2672 rdev->raid_disk >= 0)
2675 rdev->recovery_offset = recovery_start;
2676 if (recovery_start == MaxSector)
2677 set_bit(In_sync, &rdev->flags);
2679 clear_bit(In_sync, &rdev->flags);
2683 static struct rdev_sysfs_entry rdev_recovery_start =
2684 __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store);
2686 static struct attribute *rdev_default_attrs[] = {
2692 &rdev_recovery_start.attr,
2696 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
2698 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2699 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
2700 mddev_t *mddev = rdev->mddev;
2706 rv = mddev ? mddev_lock(mddev) : -EBUSY;
2708 if (rdev->mddev == NULL)
2711 rv = entry->show(rdev, page);
2712 mddev_unlock(mddev);
2718 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
2719 const char *page, size_t length)
2721 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2722 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
2724 mddev_t *mddev = rdev->mddev;
2728 if (!capable(CAP_SYS_ADMIN))
2730 rv = mddev ? mddev_lock(mddev): -EBUSY;
2732 if (rdev->mddev == NULL)
2735 rv = entry->store(rdev, page, length);
2736 mddev_unlock(mddev);
2741 static void rdev_free(struct kobject *ko)
2743 mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj);
2746 static const struct sysfs_ops rdev_sysfs_ops = {
2747 .show = rdev_attr_show,
2748 .store = rdev_attr_store,
2750 static struct kobj_type rdev_ktype = {
2751 .release = rdev_free,
2752 .sysfs_ops = &rdev_sysfs_ops,
2753 .default_attrs = rdev_default_attrs,
2756 void md_rdev_init(mdk_rdev_t *rdev)
2759 rdev->saved_raid_disk = -1;
2760 rdev->raid_disk = -1;
2762 rdev->data_offset = 0;
2763 rdev->sb_events = 0;
2764 rdev->last_read_error.tv_sec = 0;
2765 rdev->last_read_error.tv_nsec = 0;
2766 atomic_set(&rdev->nr_pending, 0);
2767 atomic_set(&rdev->read_errors, 0);
2768 atomic_set(&rdev->corrected_errors, 0);
2770 INIT_LIST_HEAD(&rdev->same_set);
2771 init_waitqueue_head(&rdev->blocked_wait);
2773 EXPORT_SYMBOL_GPL(md_rdev_init);
2775 * Import a device. If 'super_format' >= 0, then sanity check the superblock
2777 * mark the device faulty if:
2779 * - the device is nonexistent (zero size)
2780 * - the device has no valid superblock
2782 * a faulty rdev _never_ has rdev->sb set.
2784 static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor)
2786 char b[BDEVNAME_SIZE];
2791 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
2793 printk(KERN_ERR "md: could not alloc mem for new device!\n");
2794 return ERR_PTR(-ENOMEM);
2798 if ((err = alloc_disk_sb(rdev)))
2801 err = lock_rdev(rdev, newdev, super_format == -2);
2805 kobject_init(&rdev->kobj, &rdev_ktype);
2807 size = i_size_read(rdev->bdev->bd_inode) >> BLOCK_SIZE_BITS;
2810 "md: %s has zero or unknown size, marking faulty!\n",
2811 bdevname(rdev->bdev,b));
2816 if (super_format >= 0) {
2817 err = super_types[super_format].
2818 load_super(rdev, NULL, super_minor);
2819 if (err == -EINVAL) {
2821 "md: %s does not have a valid v%d.%d "
2822 "superblock, not importing!\n",
2823 bdevname(rdev->bdev,b),
2824 super_format, super_minor);
2829 "md: could not read %s's sb, not importing!\n",
2830 bdevname(rdev->bdev,b));
2838 if (rdev->sb_page) {
2844 return ERR_PTR(err);
2848 * Check a full RAID array for plausibility
2852 static void analyze_sbs(mddev_t * mddev)
2855 mdk_rdev_t *rdev, *freshest, *tmp;
2856 char b[BDEVNAME_SIZE];
2859 rdev_for_each(rdev, tmp, mddev)
2860 switch (super_types[mddev->major_version].
2861 load_super(rdev, freshest, mddev->minor_version)) {
2869 "md: fatal superblock inconsistency in %s"
2870 " -- removing from array\n",
2871 bdevname(rdev->bdev,b));
2872 kick_rdev_from_array(rdev);
2876 super_types[mddev->major_version].
2877 validate_super(mddev, freshest);
2880 rdev_for_each(rdev, tmp, mddev) {
2881 if (mddev->max_disks &&
2882 (rdev->desc_nr >= mddev->max_disks ||
2883 i > mddev->max_disks)) {
2885 "md: %s: %s: only %d devices permitted\n",
2886 mdname(mddev), bdevname(rdev->bdev, b),
2888 kick_rdev_from_array(rdev);
2891 if (rdev != freshest)
2892 if (super_types[mddev->major_version].
2893 validate_super(mddev, rdev)) {
2894 printk(KERN_WARNING "md: kicking non-fresh %s"
2896 bdevname(rdev->bdev,b));
2897 kick_rdev_from_array(rdev);
2900 if (mddev->level == LEVEL_MULTIPATH) {
2901 rdev->desc_nr = i++;
2902 rdev->raid_disk = rdev->desc_nr;
2903 set_bit(In_sync, &rdev->flags);
2904 } else if (rdev->raid_disk >= (mddev->raid_disks - min(0, mddev->delta_disks))) {
2905 rdev->raid_disk = -1;
2906 clear_bit(In_sync, &rdev->flags);
2911 /* Read a fixed-point number.
2912 * Numbers in sysfs attributes should be in "standard" units where
2913 * possible, so time should be in seconds.
2914 * However we internally use a a much smaller unit such as
2915 * milliseconds or jiffies.
2916 * This function takes a decimal number with a possible fractional
2917 * component, and produces an integer which is the result of
2918 * multiplying that number by 10^'scale'.
2919 * all without any floating-point arithmetic.
2921 int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale)
2923 unsigned long result = 0;
2925 while (isdigit(*cp) || (*cp == '.' && decimals < 0)) {
2928 else if (decimals < scale) {
2931 result = result * 10 + value;
2943 while (decimals < scale) {
2952 static void md_safemode_timeout(unsigned long data);
2955 safe_delay_show(mddev_t *mddev, char *page)
2957 int msec = (mddev->safemode_delay*1000)/HZ;
2958 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
2961 safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len)
2965 if (strict_strtoul_scaled(cbuf, &msec, 3) < 0)
2968 mddev->safemode_delay = 0;
2970 unsigned long old_delay = mddev->safemode_delay;
2971 mddev->safemode_delay = (msec*HZ)/1000;
2972 if (mddev->safemode_delay == 0)
2973 mddev->safemode_delay = 1;
2974 if (mddev->safemode_delay < old_delay)
2975 md_safemode_timeout((unsigned long)mddev);
2979 static struct md_sysfs_entry md_safe_delay =
2980 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
2983 level_show(mddev_t *mddev, char *page)
2985 struct mdk_personality *p = mddev->pers;
2987 return sprintf(page, "%s\n", p->name);
2988 else if (mddev->clevel[0])
2989 return sprintf(page, "%s\n", mddev->clevel);
2990 else if (mddev->level != LEVEL_NONE)
2991 return sprintf(page, "%d\n", mddev->level);
2997 level_store(mddev_t *mddev, const char *buf, size_t len)
3001 struct mdk_personality *pers;
3006 if (mddev->pers == NULL) {
3009 if (len >= sizeof(mddev->clevel))
3011 strncpy(mddev->clevel, buf, len);
3012 if (mddev->clevel[len-1] == '\n')
3014 mddev->clevel[len] = 0;
3015 mddev->level = LEVEL_NONE;
3019 /* request to change the personality. Need to ensure:
3020 * - array is not engaged in resync/recovery/reshape
3021 * - old personality can be suspended
3022 * - new personality will access other array.
3025 if (mddev->sync_thread ||
3026 mddev->reshape_position != MaxSector ||
3027 mddev->sysfs_active)
3030 if (!mddev->pers->quiesce) {
3031 printk(KERN_WARNING "md: %s: %s does not support online personality change\n",
3032 mdname(mddev), mddev->pers->name);
3036 /* Now find the new personality */
3037 if (len == 0 || len >= sizeof(clevel))
3039 strncpy(clevel, buf, len);
3040 if (clevel[len-1] == '\n')
3043 if (strict_strtol(clevel, 10, &level))
3046 if (request_module("md-%s", clevel) != 0)
3047 request_module("md-level-%s", clevel);
3048 spin_lock(&pers_lock);
3049 pers = find_pers(level, clevel);
3050 if (!pers || !try_module_get(pers->owner)) {
3051 spin_unlock(&pers_lock);
3052 printk(KERN_WARNING "md: personality %s not loaded\n", clevel);
3055 spin_unlock(&pers_lock);
3057 if (pers == mddev->pers) {
3058 /* Nothing to do! */
3059 module_put(pers->owner);
3062 if (!pers->takeover) {
3063 module_put(pers->owner);
3064 printk(KERN_WARNING "md: %s: %s does not support personality takeover\n",
3065 mdname(mddev), clevel);
3069 list_for_each_entry(rdev, &mddev->disks, same_set)
3070 rdev->new_raid_disk = rdev->raid_disk;
3072 /* ->takeover must set new_* and/or delta_disks
3073 * if it succeeds, and may set them when it fails.
3075 priv = pers->takeover(mddev);
3077 mddev->new_level = mddev->level;
3078 mddev->new_layout = mddev->layout;
3079 mddev->new_chunk_sectors = mddev->chunk_sectors;
3080 mddev->raid_disks -= mddev->delta_disks;
3081 mddev->delta_disks = 0;
3082 module_put(pers->owner);
3083 printk(KERN_WARNING "md: %s: %s would not accept array\n",
3084 mdname(mddev), clevel);
3085 return PTR_ERR(priv);
3088 /* Looks like we have a winner */
3089 mddev_suspend(mddev);
3090 mddev->pers->stop(mddev);
3092 if (mddev->pers->sync_request == NULL &&
3093 pers->sync_request != NULL) {
3094 /* need to add the md_redundancy_group */
3095 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
3097 "md: cannot register extra attributes for %s\n",
3099 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, NULL, "sync_action");
3101 if (mddev->pers->sync_request != NULL &&
3102 pers->sync_request == NULL) {
3103 /* need to remove the md_redundancy_group */
3104 if (mddev->to_remove == NULL)
3105 mddev->to_remove = &md_redundancy_group;
3108 if (mddev->pers->sync_request == NULL &&
3110 /* We are converting from a no-redundancy array
3111 * to a redundancy array and metadata is managed
3112 * externally so we need to be sure that writes
3113 * won't block due to a need to transition
3115 * until external management is started.
3118 mddev->safemode_delay = 0;
3119 mddev->safemode = 0;
3122 list_for_each_entry(rdev, &mddev->disks, same_set) {
3124 if (rdev->raid_disk < 0)
3126 if (rdev->new_raid_disk >= mddev->raid_disks)
3127 rdev->new_raid_disk = -1;
3128 if (rdev->new_raid_disk == rdev->raid_disk)
3130 sprintf(nm, "rd%d", rdev->raid_disk);
3131 sysfs_remove_link(&mddev->kobj, nm);
3133 list_for_each_entry(rdev, &mddev->disks, same_set) {
3134 if (rdev->raid_disk < 0)
3136 if (rdev->new_raid_disk == rdev->raid_disk)
3138 rdev->raid_disk = rdev->new_raid_disk;
3139 if (rdev->raid_disk < 0)
3140 clear_bit(In_sync, &rdev->flags);
3143 sprintf(nm, "rd%d", rdev->raid_disk);
3144 if(sysfs_create_link(&mddev->kobj, &rdev->kobj, nm))
3145 printk("md: cannot register %s for %s after level change\n",
3150 module_put(mddev->pers->owner);
3152 mddev->private = priv;
3153 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
3154 mddev->level = mddev->new_level;
3155 mddev->layout = mddev->new_layout;
3156 mddev->chunk_sectors = mddev->new_chunk_sectors;
3157 mddev->delta_disks = 0;
3158 if (mddev->pers->sync_request == NULL) {
3159 /* this is now an array without redundancy, so
3160 * it must always be in_sync
3163 del_timer_sync(&mddev->safemode_timer);
3166 mddev_resume(mddev);
3167 set_bit(MD_CHANGE_DEVS, &mddev->flags);
3168 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3169 md_wakeup_thread(mddev->thread);
3170 sysfs_notify(&mddev->kobj, NULL, "level");
3171 md_new_event(mddev);
3175 static struct md_sysfs_entry md_level =
3176 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
3180 layout_show(mddev_t *mddev, char *page)
3182 /* just a number, not meaningful for all levels */
3183 if (mddev->reshape_position != MaxSector &&
3184 mddev->layout != mddev->new_layout)
3185 return sprintf(page, "%d (%d)\n",
3186 mddev->new_layout, mddev->layout);
3187 return sprintf(page, "%d\n", mddev->layout);
3191 layout_store(mddev_t *mddev, const char *buf, size_t len)
3194 unsigned long n = simple_strtoul(buf, &e, 10);
3196 if (!*buf || (*e && *e != '\n'))
3201 if (mddev->pers->check_reshape == NULL)
3203 mddev->new_layout = n;
3204 err = mddev->pers->check_reshape(mddev);
3206 mddev->new_layout = mddev->layout;
3210 mddev->new_layout = n;
3211 if (mddev->reshape_position == MaxSector)
3216 static struct md_sysfs_entry md_layout =
3217 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
3221 raid_disks_show(mddev_t *mddev, char *page)
3223 if (mddev->raid_disks == 0)
3225 if (mddev->reshape_position != MaxSector &&
3226 mddev->delta_disks != 0)
3227 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
3228 mddev->raid_disks - mddev->delta_disks);
3229 return sprintf(page, "%d\n", mddev->raid_disks);
3232 static int update_raid_disks(mddev_t *mddev, int raid_disks);
3235 raid_disks_store(mddev_t *mddev, const char *buf, size_t len)
3239 unsigned long n = simple_strtoul(buf, &e, 10);
3241 if (!*buf || (*e && *e != '\n'))
3245 rv = update_raid_disks(mddev, n);
3246 else if (mddev->reshape_position != MaxSector) {
3247 int olddisks = mddev->raid_disks - mddev->delta_disks;
3248 mddev->delta_disks = n - olddisks;
3249 mddev->raid_disks = n;
3251 mddev->raid_disks = n;
3252 return rv ? rv : len;
3254 static struct md_sysfs_entry md_raid_disks =
3255 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
3258 chunk_size_show(mddev_t *mddev, char *page)
3260 if (mddev->reshape_position != MaxSector &&
3261 mddev->chunk_sectors != mddev->new_chunk_sectors)
3262 return sprintf(page, "%d (%d)\n",
3263 mddev->new_chunk_sectors << 9,
3264 mddev->chunk_sectors << 9);
3265 return sprintf(page, "%d\n", mddev->chunk_sectors << 9);
3269 chunk_size_store(mddev_t *mddev, const char *buf, size_t len)
3272 unsigned long n = simple_strtoul(buf, &e, 10);
3274 if (!*buf || (*e && *e != '\n'))
3279 if (mddev->pers->check_reshape == NULL)
3281 mddev->new_chunk_sectors = n >> 9;
3282 err = mddev->pers->check_reshape(mddev);
3284 mddev->new_chunk_sectors = mddev->chunk_sectors;
3288 mddev->new_chunk_sectors = n >> 9;
3289 if (mddev->reshape_position == MaxSector)
3290 mddev->chunk_sectors = n >> 9;
3294 static struct md_sysfs_entry md_chunk_size =
3295 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
3298 resync_start_show(mddev_t *mddev, char *page)
3300 if (mddev->recovery_cp == MaxSector)
3301 return sprintf(page, "none\n");
3302 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
3306 resync_start_store(mddev_t *mddev, const char *buf, size_t len)
3309 unsigned long long n = simple_strtoull(buf, &e, 10);
3313 if (cmd_match(buf, "none"))
3315 else if (!*buf || (*e && *e != '\n'))
3318 mddev->recovery_cp = n;
3321 static struct md_sysfs_entry md_resync_start =
3322 __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store);
3325 * The array state can be:
3328 * No devices, no size, no level
3329 * Equivalent to STOP_ARRAY ioctl
3331 * May have some settings, but array is not active
3332 * all IO results in error
3333 * When written, doesn't tear down array, but just stops it
3334 * suspended (not supported yet)
3335 * All IO requests will block. The array can be reconfigured.
3336 * Writing this, if accepted, will block until array is quiescent
3338 * no resync can happen. no superblocks get written.
3339 * write requests fail
3341 * like readonly, but behaves like 'clean' on a write request.
3343 * clean - no pending writes, but otherwise active.
3344 * When written to inactive array, starts without resync
3345 * If a write request arrives then
3346 * if metadata is known, mark 'dirty' and switch to 'active'.
3347 * if not known, block and switch to write-pending
3348 * If written to an active array that has pending writes, then fails.
3350 * fully active: IO and resync can be happening.
3351 * When written to inactive array, starts with resync
3354 * clean, but writes are blocked waiting for 'active' to be written.
3357 * like active, but no writes have been seen for a while (100msec).
3360 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
3361 write_pending, active_idle, bad_word};
3362 static char *array_states[] = {
3363 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3364 "write-pending", "active-idle", NULL };
3366 static int match_word(const char *word, char **list)
3369 for (n=0; list[n]; n++)
3370 if (cmd_match(word, list[n]))
3376 array_state_show(mddev_t *mddev, char *page)
3378 enum array_state st = inactive;
3391 else if (test_bit(MD_CHANGE_PENDING, &mddev->flags))
3393 else if (mddev->safemode)
3399 if (list_empty(&mddev->disks) &&
3400 mddev->raid_disks == 0 &&
3401 mddev->dev_sectors == 0)
3406 return sprintf(page, "%s\n", array_states[st]);
3409 static int do_md_stop(mddev_t * mddev, int ro, int is_open);
3410 static int md_set_readonly(mddev_t * mddev, int is_open);
3411 static int do_md_run(mddev_t * mddev);
3412 static int restart_array(mddev_t *mddev);
3415 array_state_store(mddev_t *mddev, const char *buf, size_t len)
3418 enum array_state st = match_word(buf, array_states);
3423 /* stopping an active array */
3424 if (atomic_read(&mddev->openers) > 0)
3426 err = do_md_stop(mddev, 0, 0);
3429 /* stopping an active array */
3431 if (atomic_read(&mddev->openers) > 0)
3433 err = do_md_stop(mddev, 2, 0);
3435 err = 0; /* already inactive */
3438 break; /* not supported yet */
3441 err = md_set_readonly(mddev, 0);
3444 set_disk_ro(mddev->gendisk, 1);
3445 err = do_md_run(mddev);
3451 err = md_set_readonly(mddev, 0);
3452 else if (mddev->ro == 1)
3453 err = restart_array(mddev);
3456 set_disk_ro(mddev->gendisk, 0);
3460 err = do_md_run(mddev);
3465 restart_array(mddev);
3466 spin_lock_irq(&mddev->write_lock);
3467 if (atomic_read(&mddev->writes_pending) == 0) {
3468 if (mddev->in_sync == 0) {
3470 if (mddev->safemode == 1)
3471 mddev->safemode = 0;
3472 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
3477 spin_unlock_irq(&mddev->write_lock);
3483 restart_array(mddev);
3484 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
3485 wake_up(&mddev->sb_wait);
3489 set_disk_ro(mddev->gendisk, 0);
3490 err = do_md_run(mddev);
3495 /* these cannot be set */
3501 sysfs_notify_dirent_safe(mddev->sysfs_state);
3505 static struct md_sysfs_entry md_array_state =
3506 __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
3509 max_corrected_read_errors_show(mddev_t *mddev, char *page) {
3510 return sprintf(page, "%d\n",
3511 atomic_read(&mddev->max_corr_read_errors));
3515 max_corrected_read_errors_store(mddev_t *mddev, const char *buf, size_t len)
3518 unsigned long n = simple_strtoul(buf, &e, 10);
3520 if (*buf && (*e == 0 || *e == '\n')) {
3521 atomic_set(&mddev->max_corr_read_errors, n);
3527 static struct md_sysfs_entry max_corr_read_errors =
3528 __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show,
3529 max_corrected_read_errors_store);
3532 null_show(mddev_t *mddev, char *page)
3538 new_dev_store(mddev_t *mddev, const char *buf, size_t len)
3540 /* buf must be %d:%d\n? giving major and minor numbers */
3541 /* The new device is added to the array.
3542 * If the array has a persistent superblock, we read the
3543 * superblock to initialise info and check validity.
3544 * Otherwise, only checking done is that in bind_rdev_to_array,
3545 * which mainly checks size.
3548 int major = simple_strtoul(buf, &e, 10);
3554 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
3556 minor = simple_strtoul(e+1, &e, 10);
3557 if (*e && *e != '\n')
3559 dev = MKDEV(major, minor);
3560 if (major != MAJOR(dev) ||
3561 minor != MINOR(dev))
3565 if (mddev->persistent) {
3566 rdev = md_import_device(dev, mddev->major_version,
3567 mddev->minor_version);
3568 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
3569 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
3570 mdk_rdev_t, same_set);
3571 err = super_types[mddev->major_version]
3572 .load_super(rdev, rdev0, mddev->minor_version);
3576 } else if (mddev->external)
3577 rdev = md_import_device(dev, -2, -1);
3579 rdev = md_import_device(dev, -1, -1);
3582 return PTR_ERR(rdev);
3583 err = bind_rdev_to_array(rdev, mddev);
3587 return err ? err : len;
3590 static struct md_sysfs_entry md_new_device =
3591 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
3594 bitmap_store(mddev_t *mddev, const char *buf, size_t len)
3597 unsigned long chunk, end_chunk;
3601 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
3603 chunk = end_chunk = simple_strtoul(buf, &end, 0);
3604 if (buf == end) break;
3605 if (*end == '-') { /* range */
3607 end_chunk = simple_strtoul(buf, &end, 0);
3608 if (buf == end) break;
3610 if (*end && !isspace(*end)) break;
3611 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
3612 buf = skip_spaces(end);
3614 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
3619 static struct md_sysfs_entry md_bitmap =
3620 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
3623 size_show(mddev_t *mddev, char *page)
3625 return sprintf(page, "%llu\n",
3626 (unsigned long long)mddev->dev_sectors / 2);
3629 static int update_size(mddev_t *mddev, sector_t num_sectors);
3632 size_store(mddev_t *mddev, const char *buf, size_t len)
3634 /* If array is inactive, we can reduce the component size, but
3635 * not increase it (except from 0).
3636 * If array is active, we can try an on-line resize
3639 int err = strict_blocks_to_sectors(buf, §ors);
3644 err = update_size(mddev, sectors);
3645 md_update_sb(mddev, 1);
3647 if (mddev->dev_sectors == 0 ||
3648 mddev->dev_sectors > sectors)
3649 mddev->dev_sectors = sectors;
3653 return err ? err : len;
3656 static struct md_sysfs_entry md_size =
3657 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
3662 * 'none' for arrays with no metadata (good luck...)
3663 * 'external' for arrays with externally managed metadata,
3664 * or N.M for internally known formats
3667 metadata_show(mddev_t *mddev, char *page)
3669 if (mddev->persistent)
3670 return sprintf(page, "%d.%d\n",
3671 mddev->major_version, mddev->minor_version);
3672 else if (mddev->external)
3673 return sprintf(page, "external:%s\n", mddev->metadata_type);
3675 return sprintf(page, "none\n");
3679 metadata_store(mddev_t *mddev, const char *buf, size_t len)
3683 /* Changing the details of 'external' metadata is
3684 * always permitted. Otherwise there must be
3685 * no devices attached to the array.
3687 if (mddev->external && strncmp(buf, "external:", 9) == 0)
3689 else if (!list_empty(&mddev->disks))
3692 if (cmd_match(buf, "none")) {
3693 mddev->persistent = 0;
3694 mddev->external = 0;
3695 mddev->major_version = 0;
3696 mddev->minor_version = 90;
3699 if (strncmp(buf, "external:", 9) == 0) {
3700 size_t namelen = len-9;
3701 if (namelen >= sizeof(mddev->metadata_type))
3702 namelen = sizeof(mddev->metadata_type)-1;
3703 strncpy(mddev->metadata_type, buf+9, namelen);
3704 mddev->metadata_type[namelen] = 0;
3705 if (namelen && mddev->metadata_type[namelen-1] == '\n')
3706 mddev->metadata_type[--namelen] = 0;
3707 mddev->persistent = 0;
3708 mddev->external = 1;
3709 mddev->major_version = 0;
3710 mddev->minor_version = 90;
3713 major = simple_strtoul(buf, &e, 10);
3714 if (e==buf || *e != '.')
3717 minor = simple_strtoul(buf, &e, 10);
3718 if (e==buf || (*e && *e != '\n') )
3720 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
3722 mddev->major_version = major;
3723 mddev->minor_version = minor;
3724 mddev->persistent = 1;
3725 mddev->external = 0;
3729 static struct md_sysfs_entry md_metadata =
3730 __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
3733 action_show(mddev_t *mddev, char *page)
3735 char *type = "idle";
3736 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
3738 else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3739 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) {
3740 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
3742 else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
3743 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
3745 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
3749 } else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
3752 return sprintf(page, "%s\n", type);
3755 static void reap_sync_thread(mddev_t *mddev);
3758 action_store(mddev_t *mddev, const char *page, size_t len)
3760 if (!mddev->pers || !mddev->pers->sync_request)
3763 if (cmd_match(page, "frozen"))
3764 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3766 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3768 if (cmd_match(page, "idle") || cmd_match(page, "frozen")) {
3769 if (mddev->sync_thread) {
3770 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
3771 reap_sync_thread(mddev);
3773 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3774 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
3776 else if (cmd_match(page, "resync"))
3777 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3778 else if (cmd_match(page, "recover")) {
3779 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
3780 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3781 } else if (cmd_match(page, "reshape")) {
3783 if (mddev->pers->start_reshape == NULL)
3785 err = mddev->pers->start_reshape(mddev);
3788 sysfs_notify(&mddev->kobj, NULL, "degraded");
3790 if (cmd_match(page, "check"))
3791 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
3792 else if (!cmd_match(page, "repair"))
3794 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
3795 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
3797 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3798 md_wakeup_thread(mddev->thread);
3799 sysfs_notify_dirent_safe(mddev->sysfs_action);
3804 mismatch_cnt_show(mddev_t *mddev, char *page)
3806 return sprintf(page, "%llu\n",
3807 (unsigned long long) mddev->resync_mismatches);
3810 static struct md_sysfs_entry md_scan_mode =
3811 __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
3814 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
3817 sync_min_show(mddev_t *mddev, char *page)
3819 return sprintf(page, "%d (%s)\n", speed_min(mddev),
3820 mddev->sync_speed_min ? "local": "system");
3824 sync_min_store(mddev_t *mddev, const char *buf, size_t len)
3828 if (strncmp(buf, "system", 6)==0) {
3829 mddev->sync_speed_min = 0;
3832 min = simple_strtoul(buf, &e, 10);
3833 if (buf == e || (*e && *e != '\n') || min <= 0)
3835 mddev->sync_speed_min = min;
3839 static struct md_sysfs_entry md_sync_min =
3840 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
3843 sync_max_show(mddev_t *mddev, char *page)
3845 return sprintf(page, "%d (%s)\n", speed_max(mddev),
3846 mddev->sync_speed_max ? "local": "system");
3850 sync_max_store(mddev_t *mddev, const char *buf, size_t len)
3854 if (strncmp(buf, "system", 6)==0) {
3855 mddev->sync_speed_max = 0;
3858 max = simple_strtoul(buf, &e, 10);
3859 if (buf == e || (*e && *e != '\n') || max <= 0)
3861 mddev->sync_speed_max = max;
3865 static struct md_sysfs_entry md_sync_max =
3866 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
3869 degraded_show(mddev_t *mddev, char *page)
3871 return sprintf(page, "%d\n", mddev->degraded);
3873 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
3876 sync_force_parallel_show(mddev_t *mddev, char *page)
3878 return sprintf(page, "%d\n", mddev->parallel_resync);
3882 sync_force_parallel_store(mddev_t *mddev, const char *buf, size_t len)
3886 if (strict_strtol(buf, 10, &n))
3889 if (n != 0 && n != 1)
3892 mddev->parallel_resync = n;
3894 if (mddev->sync_thread)
3895 wake_up(&resync_wait);
3900 /* force parallel resync, even with shared block devices */
3901 static struct md_sysfs_entry md_sync_force_parallel =
3902 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
3903 sync_force_parallel_show, sync_force_parallel_store);
3906 sync_speed_show(mddev_t *mddev, char *page)
3908 unsigned long resync, dt, db;
3909 if (mddev->curr_resync == 0)
3910 return sprintf(page, "none\n");
3911 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
3912 dt = (jiffies - mddev->resync_mark) / HZ;
3914 db = resync - mddev->resync_mark_cnt;
3915 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
3918 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
3921 sync_completed_show(mddev_t *mddev, char *page)
3923 unsigned long long max_sectors, resync;
3925 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3926 return sprintf(page, "none\n");
3928 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
3929 max_sectors = mddev->resync_max_sectors;
3931 max_sectors = mddev->dev_sectors;
3933 resync = mddev->curr_resync_completed;
3934 return sprintf(page, "%llu / %llu\n", resync, max_sectors);
3937 static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed);
3940 min_sync_show(mddev_t *mddev, char *page)
3942 return sprintf(page, "%llu\n",
3943 (unsigned long long)mddev->resync_min);
3946 min_sync_store(mddev_t *mddev, const char *buf, size_t len)
3948 unsigned long long min;
3949 if (strict_strtoull(buf, 10, &min))
3951 if (min > mddev->resync_max)
3953 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3956 /* Must be a multiple of chunk_size */
3957 if (mddev->chunk_sectors) {
3958 sector_t temp = min;
3959 if (sector_div(temp, mddev->chunk_sectors))
3962 mddev->resync_min = min;
3967 static struct md_sysfs_entry md_min_sync =
3968 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
3971 max_sync_show(mddev_t *mddev, char *page)
3973 if (mddev->resync_max == MaxSector)
3974 return sprintf(page, "max\n");
3976 return sprintf(page, "%llu\n",
3977 (unsigned long long)mddev->resync_max);
3980 max_sync_store(mddev_t *mddev, const char *buf, size_t len)
3982 if (strncmp(buf, "max", 3) == 0)
3983 mddev->resync_max = MaxSector;
3985 unsigned long long max;
3986 if (strict_strtoull(buf, 10, &max))
3988 if (max < mddev->resync_min)
3990 if (max < mddev->resync_max &&
3992 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3995 /* Must be a multiple of chunk_size */
3996 if (mddev->chunk_sectors) {
3997 sector_t temp = max;
3998 if (sector_div(temp, mddev->chunk_sectors))
4001 mddev->resync_max = max;
4003 wake_up(&mddev->recovery_wait);
4007 static struct md_sysfs_entry md_max_sync =
4008 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
4011 suspend_lo_show(mddev_t *mddev, char *page)
4013 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
4017 suspend_lo_store(mddev_t *mddev, const char *buf, size_t len)
4020 unsigned long long new = simple_strtoull(buf, &e, 10);
4021 unsigned long long old = mddev->suspend_lo;
4023 if (mddev->pers == NULL ||
4024 mddev->pers->quiesce == NULL)
4026 if (buf == e || (*e && *e != '\n'))
4029 mddev->suspend_lo = new;
4031 /* Shrinking suspended region */
4032 mddev->pers->quiesce(mddev, 2);
4034 /* Expanding suspended region - need to wait */
4035 mddev->pers->quiesce(mddev, 1);
4036 mddev->pers->quiesce(mddev, 0);
4040 static struct md_sysfs_entry md_suspend_lo =
4041 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
4045 suspend_hi_show(mddev_t *mddev, char *page)
4047 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
4051 suspend_hi_store(mddev_t *mddev, const char *buf, size_t len)
4054 unsigned long long new = simple_strtoull(buf, &e, 10);
4055 unsigned long long old = mddev->suspend_hi;
4057 if (mddev->pers == NULL ||
4058 mddev->pers->quiesce == NULL)
4060 if (buf == e || (*e && *e != '\n'))
4063 mddev->suspend_hi = new;
4065 /* Shrinking suspended region */
4066 mddev->pers->quiesce(mddev, 2);
4068 /* Expanding suspended region - need to wait */
4069 mddev->pers->quiesce(mddev, 1);
4070 mddev->pers->quiesce(mddev, 0);
4074 static struct md_sysfs_entry md_suspend_hi =
4075 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
4078 reshape_position_show(mddev_t *mddev, char *page)
4080 if (mddev->reshape_position != MaxSector)
4081 return sprintf(page, "%llu\n",
4082 (unsigned long long)mddev->reshape_position);
4083 strcpy(page, "none\n");
4088 reshape_position_store(mddev_t *mddev, const char *buf, size_t len)
4091 unsigned long long new = simple_strtoull(buf, &e, 10);
4094 if (buf == e || (*e && *e != '\n'))
4096 mddev->reshape_position = new;
4097 mddev->delta_disks = 0;
4098 mddev->new_level = mddev->level;
4099 mddev->new_layout = mddev->layout;
4100 mddev->new_chunk_sectors = mddev->chunk_sectors;
4104 static struct md_sysfs_entry md_reshape_position =
4105 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
4106 reshape_position_store);
4109 array_size_show(mddev_t *mddev, char *page)
4111 if (mddev->external_size)
4112 return sprintf(page, "%llu\n",
4113 (unsigned long long)mddev->array_sectors/2);
4115 return sprintf(page, "default\n");
4119 array_size_store(mddev_t *mddev, const char *buf, size_t len)
4123 if (strncmp(buf, "default", 7) == 0) {
4125 sectors = mddev->pers->size(mddev, 0, 0);
4127 sectors = mddev->array_sectors;
4129 mddev->external_size = 0;
4131 if (strict_blocks_to_sectors(buf, §ors) < 0)
4133 if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors)
4136 mddev->external_size = 1;
4139 mddev->array_sectors = sectors;
4140 set_capacity(mddev->gendisk, mddev->array_sectors);
4142 revalidate_disk(mddev->gendisk);
4147 static struct md_sysfs_entry md_array_size =
4148 __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show,
4151 static struct attribute *md_default_attrs[] = {
4154 &md_raid_disks.attr,
4155 &md_chunk_size.attr,
4157 &md_resync_start.attr,
4159 &md_new_device.attr,
4160 &md_safe_delay.attr,
4161 &md_array_state.attr,
4162 &md_reshape_position.attr,
4163 &md_array_size.attr,
4164 &max_corr_read_errors.attr,
4168 static struct attribute *md_redundancy_attrs[] = {
4170 &md_mismatches.attr,
4173 &md_sync_speed.attr,
4174 &md_sync_force_parallel.attr,
4175 &md_sync_completed.attr,
4178 &md_suspend_lo.attr,
4179 &md_suspend_hi.attr,
4184 static struct attribute_group md_redundancy_group = {
4186 .attrs = md_redundancy_attrs,
4191 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
4193 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
4194 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
4199 rv = mddev_lock(mddev);
4201 rv = entry->show(mddev, page);
4202 mddev_unlock(mddev);
4208 md_attr_store(struct kobject *kobj, struct attribute *attr,
4209 const char *page, size_t length)
4211 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
4212 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
4217 if (!capable(CAP_SYS_ADMIN))
4219 rv = mddev_lock(mddev);
4220 if (mddev->hold_active == UNTIL_IOCTL)
4221 mddev->hold_active = 0;
4223 rv = entry->store(mddev, page, length);
4224 mddev_unlock(mddev);
4229 static void md_free(struct kobject *ko)
4231 mddev_t *mddev = container_of(ko, mddev_t, kobj);
4233 if (mddev->sysfs_state)
4234 sysfs_put(mddev->sysfs_state);
4236 if (mddev->gendisk) {
4237 del_gendisk(mddev->gendisk);
4238 put_disk(mddev->gendisk);
4241 blk_cleanup_queue(mddev->queue);
4246 static const struct sysfs_ops md_sysfs_ops = {
4247 .show = md_attr_show,
4248 .store = md_attr_store,
4250 static struct kobj_type md_ktype = {
4252 .sysfs_ops = &md_sysfs_ops,
4253 .default_attrs = md_default_attrs,
4258 static void mddev_delayed_delete(struct work_struct *ws)
4260 mddev_t *mddev = container_of(ws, mddev_t, del_work);
4262 sysfs_remove_group(&mddev->kobj, &md_bitmap_group);
4263 kobject_del(&mddev->kobj);
4264 kobject_put(&mddev->kobj);
4267 static int md_alloc(dev_t dev, char *name)
4269 static DEFINE_MUTEX(disks_mutex);
4270 mddev_t *mddev = mddev_find(dev);
4271 struct gendisk *disk;
4280 partitioned = (MAJOR(mddev->unit) != MD_MAJOR);
4281 shift = partitioned ? MdpMinorShift : 0;
4282 unit = MINOR(mddev->unit) >> shift;
4284 /* wait for any previous instance of this device to be
4285 * completely removed (mddev_delayed_delete).
4287 flush_workqueue(md_misc_wq);
4289 mutex_lock(&disks_mutex);
4295 /* Need to ensure that 'name' is not a duplicate.
4298 spin_lock(&all_mddevs_lock);
4300 list_for_each_entry(mddev2, &all_mddevs, all_mddevs)
4301 if (mddev2->gendisk &&
4302 strcmp(mddev2->gendisk->disk_name, name) == 0) {
4303 spin_unlock(&all_mddevs_lock);
4306 spin_unlock(&all_mddevs_lock);
4310 mddev->queue = blk_alloc_queue(GFP_KERNEL);
4313 mddev->queue->queuedata = mddev;
4315 blk_queue_make_request(mddev->queue, md_make_request);
4317 disk = alloc_disk(1 << shift);
4319 blk_cleanup_queue(mddev->queue);
4320 mddev->queue = NULL;
4323 disk->major = MAJOR(mddev->unit);
4324 disk->first_minor = unit << shift;
4326 strcpy(disk->disk_name, name);
4327 else if (partitioned)
4328 sprintf(disk->disk_name, "md_d%d", unit);
4330 sprintf(disk->disk_name, "md%d", unit);
4331 disk->fops = &md_fops;
4332 disk->private_data = mddev;
4333 disk->queue = mddev->queue;
4334 /* Allow extended partitions. This makes the
4335 * 'mdp' device redundant, but we can't really
4338 disk->flags |= GENHD_FL_EXT_DEVT;
4340 mddev->gendisk = disk;
4341 error = kobject_init_and_add(&mddev->kobj, &md_ktype,
4342 &disk_to_dev(disk)->kobj, "%s", "md");
4344 /* This isn't possible, but as kobject_init_and_add is marked
4345 * __must_check, we must do something with the result
4347 printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
4351 if (mddev->kobj.sd &&
4352 sysfs_create_group(&mddev->kobj, &md_bitmap_group))
4353 printk(KERN_DEBUG "pointless warning\n");
4355 blk_queue_flush(mddev->queue, REQ_FLUSH | REQ_FUA);
4357 mutex_unlock(&disks_mutex);
4358 if (!error && mddev->kobj.sd) {
4359 kobject_uevent(&mddev->kobj, KOBJ_ADD);
4360 mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state");
4366 static struct kobject *md_probe(dev_t dev, int *part, void *data)
4368 md_alloc(dev, NULL);
4372 static int add_named_array(const char *val, struct kernel_param *kp)
4374 /* val must be "md_*" where * is not all digits.
4375 * We allocate an array with a large free minor number, and
4376 * set the name to val. val must not already be an active name.
4378 int len = strlen(val);
4379 char buf[DISK_NAME_LEN];
4381 while (len && val[len-1] == '\n')
4383 if (len >= DISK_NAME_LEN)
4385 strlcpy(buf, val, len+1);
4386 if (strncmp(buf, "md_", 3) != 0)
4388 return md_alloc(0, buf);
4391 static void md_safemode_timeout(unsigned long data)
4393 mddev_t *mddev = (mddev_t *) data;
4395 if (!atomic_read(&mddev->writes_pending)) {
4396 mddev->safemode = 1;
4397 if (mddev->external)
4398 sysfs_notify_dirent_safe(mddev->sysfs_state);
4400 md_wakeup_thread(mddev->thread);
4403 static int start_dirty_degraded;
4405 int md_run(mddev_t *mddev)
4409 struct mdk_personality *pers;
4411 if (list_empty(&mddev->disks))
4412 /* cannot run an array with no devices.. */
4417 /* Cannot run until previous stop completes properly */
4418 if (mddev->sysfs_active)
4422 * Analyze all RAID superblock(s)
4424 if (!mddev->raid_disks) {
4425 if (!mddev->persistent)
4430 if (mddev->level != LEVEL_NONE)
4431 request_module("md-level-%d", mddev->level);
4432 else if (mddev->clevel[0])
4433 request_module("md-%s", mddev->clevel);
4436 * Drop all container device buffers, from now on
4437 * the only valid external interface is through the md
4440 list_for_each_entry(rdev, &mddev->disks, same_set) {
4441 if (test_bit(Faulty, &rdev->flags))
4443 sync_blockdev(rdev->bdev);
4444 invalidate_bdev(rdev->bdev);
4446 /* perform some consistency tests on the device.
4447 * We don't want the data to overlap the metadata,
4448 * Internal Bitmap issues have been handled elsewhere.
4450 if (rdev->meta_bdev) {
4451 /* Nothing to check */;
4452 } else if (rdev->data_offset < rdev->sb_start) {
4453 if (mddev->dev_sectors &&
4454 rdev->data_offset + mddev->dev_sectors
4456 printk("md: %s: data overlaps metadata\n",
4461 if (rdev->sb_start + rdev->sb_size/512
4462 > rdev->data_offset) {
4463 printk("md: %s: metadata overlaps data\n",
4468 sysfs_notify_dirent_safe(rdev->sysfs_state);
4471 if (mddev->bio_set == NULL)
4472 mddev->bio_set = bioset_create(BIO_POOL_SIZE, sizeof(mddev));
4474 spin_lock(&pers_lock);
4475 pers = find_pers(mddev->level, mddev->clevel);
4476 if (!pers || !try_module_get(pers->owner)) {
4477 spin_unlock(&pers_lock);
4478 if (mddev->level != LEVEL_NONE)
4479 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
4482 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
4487 spin_unlock(&pers_lock);
4488 if (mddev->level != pers->level) {
4489 mddev->level = pers->level;
4490 mddev->new_level = pers->level;
4492 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
4494 if (mddev->reshape_position != MaxSector &&
4495 pers->start_reshape == NULL) {
4496 /* This personality cannot handle reshaping... */
4498 module_put(pers->owner);
4502 if (pers->sync_request) {
4503 /* Warn if this is a potentially silly
4506 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
4510 list_for_each_entry(rdev, &mddev->disks, same_set)
4511 list_for_each_entry(rdev2, &mddev->disks, same_set) {
4513 rdev->bdev->bd_contains ==
4514 rdev2->bdev->bd_contains) {
4516 "%s: WARNING: %s appears to be"
4517 " on the same physical disk as"
4520 bdevname(rdev->bdev,b),
4521 bdevname(rdev2->bdev,b2));
4528 "True protection against single-disk"
4529 " failure might be compromised.\n");
4532 mddev->recovery = 0;
4533 /* may be over-ridden by personality */
4534 mddev->resync_max_sectors = mddev->dev_sectors;
4536 mddev->ok_start_degraded = start_dirty_degraded;
4538 if (start_readonly && mddev->ro == 0)
4539 mddev->ro = 2; /* read-only, but switch on first write */
4541 err = mddev->pers->run(mddev);
4543 printk(KERN_ERR "md: pers->run() failed ...\n");
4544 else if (mddev->pers->size(mddev, 0, 0) < mddev->array_sectors) {
4545 WARN_ONCE(!mddev->external_size, "%s: default size too small,"
4546 " but 'external_size' not in effect?\n", __func__);
4548 "md: invalid array_size %llu > default size %llu\n",
4549 (unsigned long long)mddev->array_sectors / 2,
4550 (unsigned long long)mddev->pers->size(mddev, 0, 0) / 2);
4552 mddev->pers->stop(mddev);
4554 if (err == 0 && mddev->pers->sync_request) {
4555 err = bitmap_create(mddev);
4557 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
4558 mdname(mddev), err);
4559 mddev->pers->stop(mddev);
4563 module_put(mddev->pers->owner);
4565 bitmap_destroy(mddev);
4568 if (mddev->pers->sync_request) {
4569 if (mddev->kobj.sd &&
4570 sysfs_create_group(&mddev->kobj, &md_redundancy_group))
4572 "md: cannot register extra attributes for %s\n",
4574 mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action");
4575 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
4578 atomic_set(&mddev->writes_pending,0);
4579 atomic_set(&mddev->max_corr_read_errors,
4580 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS);
4581 mddev->safemode = 0;
4582 mddev->safemode_timer.function = md_safemode_timeout;
4583 mddev->safemode_timer.data = (unsigned long) mddev;
4584 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
4588 list_for_each_entry(rdev, &mddev->disks, same_set)
4589 if (rdev->raid_disk >= 0) {
4591 sprintf(nm, "rd%d", rdev->raid_disk);
4592 if (sysfs_create_link(&mddev->kobj, &rdev->kobj, nm))
4593 /* failure here is OK */;
4596 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4599 md_update_sb(mddev, 0);
4601 md_wakeup_thread(mddev->thread);
4602 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
4604 md_new_event(mddev);
4605 sysfs_notify_dirent_safe(mddev->sysfs_state);
4606 sysfs_notify_dirent_safe(mddev->sysfs_action);
4607 sysfs_notify(&mddev->kobj, NULL, "degraded");
4610 EXPORT_SYMBOL_GPL(md_run);
4612 static int do_md_run(mddev_t *mddev)
4616 err = md_run(mddev);
4619 err = bitmap_load(mddev);
4621 bitmap_destroy(mddev);
4624 set_capacity(mddev->gendisk, mddev->array_sectors);
4625 revalidate_disk(mddev->gendisk);
4626 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
4631 static int restart_array(mddev_t *mddev)
4633 struct gendisk *disk = mddev->gendisk;
4635 /* Complain if it has no devices */
4636 if (list_empty(&mddev->disks))
4642 mddev->safemode = 0;
4644 set_disk_ro(disk, 0);
4645 printk(KERN_INFO "md: %s switched to read-write mode.\n",
4647 /* Kick recovery or resync if necessary */
4648 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4649 md_wakeup_thread(mddev->thread);
4650 md_wakeup_thread(mddev->sync_thread);
4651 sysfs_notify_dirent_safe(mddev->sysfs_state);
4655 /* similar to deny_write_access, but accounts for our holding a reference
4656 * to the file ourselves */
4657 static int deny_bitmap_write_access(struct file * file)
4659 struct inode *inode = file->f_mapping->host;
4661 spin_lock(&inode->i_lock);
4662 if (atomic_read(&inode->i_writecount) > 1) {
4663 spin_unlock(&inode->i_lock);
4666 atomic_set(&inode->i_writecount, -1);
4667 spin_unlock(&inode->i_lock);
4672 void restore_bitmap_write_access(struct file *file)
4674 struct inode *inode = file->f_mapping->host;
4676 spin_lock(&inode->i_lock);
4677 atomic_set(&inode->i_writecount, 1);
4678 spin_unlock(&inode->i_lock);
4681 static void md_clean(mddev_t *mddev)
4683 mddev->array_sectors = 0;
4684 mddev->external_size = 0;
4685 mddev->dev_sectors = 0;
4686 mddev->raid_disks = 0;
4687 mddev->recovery_cp = 0;
4688 mddev->resync_min = 0;
4689 mddev->resync_max = MaxSector;
4690 mddev->reshape_position = MaxSector;
4691 mddev->external = 0;
4692 mddev->persistent = 0;
4693 mddev->level = LEVEL_NONE;
4694 mddev->clevel[0] = 0;
4697 mddev->metadata_type[0] = 0;
4698 mddev->chunk_sectors = 0;
4699 mddev->ctime = mddev->utime = 0;
4701 mddev->max_disks = 0;
4703 mddev->can_decrease_events = 0;
4704 mddev->delta_disks = 0;
4705 mddev->new_level = LEVEL_NONE;
4706 mddev->new_layout = 0;
4707 mddev->new_chunk_sectors = 0;
4708 mddev->curr_resync = 0;
4709 mddev->resync_mismatches = 0;
4710 mddev->suspend_lo = mddev->suspend_hi = 0;
4711 mddev->sync_speed_min = mddev->sync_speed_max = 0;
4712 mddev->recovery = 0;
4714 mddev->degraded = 0;
4715 mddev->safemode = 0;
4716 mddev->bitmap_info.offset = 0;
4717 mddev->bitmap_info.default_offset = 0;
4718 mddev->bitmap_info.chunksize = 0;
4719 mddev->bitmap_info.daemon_sleep = 0;
4720 mddev->bitmap_info.max_write_behind = 0;
4724 static void __md_stop_writes(mddev_t *mddev)
4726 if (mddev->sync_thread) {
4727 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4728 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4729 reap_sync_thread(mddev);
4732 del_timer_sync(&mddev->safemode_timer);
4734 bitmap_flush(mddev);
4735 md_super_wait(mddev);
4737 if (!mddev->in_sync || mddev->flags) {
4738 /* mark array as shutdown cleanly */
4740 md_update_sb(mddev, 1);
4744 void md_stop_writes(mddev_t *mddev)
4747 __md_stop_writes(mddev);
4748 mddev_unlock(mddev);
4750 EXPORT_SYMBOL_GPL(md_stop_writes);
4752 void md_stop(mddev_t *mddev)
4755 mddev->pers->stop(mddev);
4756 if (mddev->pers->sync_request && mddev->to_remove == NULL)
4757 mddev->to_remove = &md_redundancy_group;
4758 module_put(mddev->pers->owner);
4760 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4762 EXPORT_SYMBOL_GPL(md_stop);
4764 static int md_set_readonly(mddev_t *mddev, int is_open)
4767 mutex_lock(&mddev->open_mutex);
4768 if (atomic_read(&mddev->openers) > is_open) {
4769 printk("md: %s still in use.\n",mdname(mddev));
4774 __md_stop_writes(mddev);
4780 set_disk_ro(mddev->gendisk, 1);
4781 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4782 sysfs_notify_dirent_safe(mddev->sysfs_state);
4786 mutex_unlock(&mddev->open_mutex);
4791 * 0 - completely stop and dis-assemble array
4792 * 2 - stop but do not disassemble array
4794 static int do_md_stop(mddev_t * mddev, int mode, int is_open)
4796 struct gendisk *disk = mddev->gendisk;
4799 mutex_lock(&mddev->open_mutex);
4800 if (atomic_read(&mddev->openers) > is_open ||
4801 mddev->sysfs_active) {
4802 printk("md: %s still in use.\n",mdname(mddev));
4803 mutex_unlock(&mddev->open_mutex);
4809 set_disk_ro(disk, 0);
4811 __md_stop_writes(mddev);
4813 mddev->queue->merge_bvec_fn = NULL;
4814 mddev->queue->backing_dev_info.congested_fn = NULL;
4816 /* tell userspace to handle 'inactive' */
4817 sysfs_notify_dirent_safe(mddev->sysfs_state);
4819 list_for_each_entry(rdev, &mddev->disks, same_set)
4820 if (rdev->raid_disk >= 0) {
4822 sprintf(nm, "rd%d", rdev->raid_disk);
4823 sysfs_remove_link(&mddev->kobj, nm);
4826 set_capacity(disk, 0);
4827 mutex_unlock(&mddev->open_mutex);
4828 revalidate_disk(disk);
4833 mutex_unlock(&mddev->open_mutex);
4835 * Free resources if final stop
4838 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
4840 bitmap_destroy(mddev);
4841 if (mddev->bitmap_info.file) {
4842 restore_bitmap_write_access(mddev->bitmap_info.file);
4843 fput(mddev->bitmap_info.file);
4844 mddev->bitmap_info.file = NULL;
4846 mddev->bitmap_info.offset = 0;
4848 export_array(mddev);
4851 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
4852 if (mddev->hold_active == UNTIL_STOP)
4853 mddev->hold_active = 0;
4855 blk_integrity_unregister(disk);
4856 md_new_event(mddev);
4857 sysfs_notify_dirent_safe(mddev->sysfs_state);
4862 static void autorun_array(mddev_t *mddev)
4867 if (list_empty(&mddev->disks))
4870 printk(KERN_INFO "md: running: ");
4872 list_for_each_entry(rdev, &mddev->disks, same_set) {
4873 char b[BDEVNAME_SIZE];
4874 printk("<%s>", bdevname(rdev->bdev,b));
4878 err = do_md_run(mddev);
4880 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
4881 do_md_stop(mddev, 0, 0);
4886 * lets try to run arrays based on all disks that have arrived
4887 * until now. (those are in pending_raid_disks)
4889 * the method: pick the first pending disk, collect all disks with
4890 * the same UUID, remove all from the pending list and put them into
4891 * the 'same_array' list. Then order this list based on superblock
4892 * update time (freshest comes first), kick out 'old' disks and
4893 * compare superblocks. If everything's fine then run it.
4895 * If "unit" is allocated, then bump its reference count
4897 static void autorun_devices(int part)
4899 mdk_rdev_t *rdev0, *rdev, *tmp;
4901 char b[BDEVNAME_SIZE];
4903 printk(KERN_INFO "md: autorun ...\n");
4904 while (!list_empty(&pending_raid_disks)) {
4907 LIST_HEAD(candidates);
4908 rdev0 = list_entry(pending_raid_disks.next,
4909 mdk_rdev_t, same_set);
4911 printk(KERN_INFO "md: considering %s ...\n",
4912 bdevname(rdev0->bdev,b));
4913 INIT_LIST_HEAD(&candidates);
4914 rdev_for_each_list(rdev, tmp, &pending_raid_disks)
4915 if (super_90_load(rdev, rdev0, 0) >= 0) {
4916 printk(KERN_INFO "md: adding %s ...\n",
4917 bdevname(rdev->bdev,b));
4918 list_move(&rdev->same_set, &candidates);
4921 * now we have a set of devices, with all of them having
4922 * mostly sane superblocks. It's time to allocate the
4926 dev = MKDEV(mdp_major,
4927 rdev0->preferred_minor << MdpMinorShift);
4928 unit = MINOR(dev) >> MdpMinorShift;
4930 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
4933 if (rdev0->preferred_minor != unit) {
4934 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
4935 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
4939 md_probe(dev, NULL, NULL);
4940 mddev = mddev_find(dev);
4941 if (!mddev || !mddev->gendisk) {
4945 "md: cannot allocate memory for md drive.\n");
4948 if (mddev_lock(mddev))
4949 printk(KERN_WARNING "md: %s locked, cannot run\n",
4951 else if (mddev->raid_disks || mddev->major_version
4952 || !list_empty(&mddev->disks)) {
4954 "md: %s already running, cannot run %s\n",
4955 mdname(mddev), bdevname(rdev0->bdev,b));
4956 mddev_unlock(mddev);
4958 printk(KERN_INFO "md: created %s\n", mdname(mddev));
4959 mddev->persistent = 1;
4960 rdev_for_each_list(rdev, tmp, &candidates) {
4961 list_del_init(&rdev->same_set);
4962 if (bind_rdev_to_array(rdev, mddev))
4965 autorun_array(mddev);
4966 mddev_unlock(mddev);
4968 /* on success, candidates will be empty, on error
4971 rdev_for_each_list(rdev, tmp, &candidates) {
4972 list_del_init(&rdev->same_set);
4977 printk(KERN_INFO "md: ... autorun DONE.\n");
4979 #endif /* !MODULE */
4981 static int get_version(void __user * arg)
4985 ver.major = MD_MAJOR_VERSION;
4986 ver.minor = MD_MINOR_VERSION;
4987 ver.patchlevel = MD_PATCHLEVEL_VERSION;
4989 if (copy_to_user(arg, &ver, sizeof(ver)))
4995 static int get_array_info(mddev_t * mddev, void __user * arg)
4997 mdu_array_info_t info;
4998 int nr,working,insync,failed,spare;
5001 nr=working=insync=failed=spare=0;
5002 list_for_each_entry(rdev, &mddev->disks, same_set) {
5004 if (test_bit(Faulty, &rdev->flags))
5008 if (test_bit(In_sync, &rdev->flags))
5015 info.major_version = mddev->major_version;
5016 info.minor_version = mddev->minor_version;
5017 info.patch_version = MD_PATCHLEVEL_VERSION;
5018 info.ctime = mddev->ctime;
5019 info.level = mddev->level;
5020 info.size = mddev->dev_sectors / 2;
5021 if (info.size != mddev->dev_sectors / 2) /* overflow */
5024 info.raid_disks = mddev->raid_disks;
5025 info.md_minor = mddev->md_minor;
5026 info.not_persistent= !mddev->persistent;
5028 info.utime = mddev->utime;
5031 info.state = (1<<MD_SB_CLEAN);
5032 if (mddev->bitmap && mddev->bitmap_info.offset)
5033 info.state = (1<<MD_SB_BITMAP_PRESENT);
5034 info.active_disks = insync;
5035 info.working_disks = working;
5036 info.failed_disks = failed;
5037 info.spare_disks = spare;
5039 info.layout = mddev->layout;
5040 info.chunk_size = mddev->chunk_sectors << 9;
5042 if (copy_to_user(arg, &info, sizeof(info)))
5048 static int get_bitmap_file(mddev_t * mddev, void __user * arg)
5050 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
5051 char *ptr, *buf = NULL;
5054 if (md_allow_write(mddev))
5055 file = kmalloc(sizeof(*file), GFP_NOIO);
5057 file = kmalloc(sizeof(*file), GFP_KERNEL);
5062 /* bitmap disabled, zero the first byte and copy out */
5063 if (!mddev->bitmap || !mddev->bitmap->file) {
5064 file->pathname[0] = '\0';
5068 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
5072 ptr = d_path(&mddev->bitmap->file->f_path, buf, sizeof(file->pathname));
5076 strcpy(file->pathname, ptr);
5080 if (copy_to_user(arg, file, sizeof(*file)))
5088 static int get_disk_info(mddev_t * mddev, void __user * arg)
5090 mdu_disk_info_t info;
5093 if (copy_from_user(&info, arg, sizeof(info)))
5096 rdev = find_rdev_nr(mddev, info.number);
5098 info.major = MAJOR(rdev->bdev->bd_dev);
5099 info.minor = MINOR(rdev->bdev->bd_dev);
5100 info.raid_disk = rdev->raid_disk;
5102 if (test_bit(Faulty, &rdev->flags))
5103 info.state |= (1<<MD_DISK_FAULTY);
5104 else if (test_bit(In_sync, &rdev->flags)) {
5105 info.state |= (1<<MD_DISK_ACTIVE);
5106 info.state |= (1<<MD_DISK_SYNC);
5108 if (test_bit(WriteMostly, &rdev->flags))
5109 info.state |= (1<<MD_DISK_WRITEMOSTLY);
5111 info.major = info.minor = 0;
5112 info.raid_disk = -1;
5113 info.state = (1<<MD_DISK_REMOVED);
5116 if (copy_to_user(arg, &info, sizeof(info)))
5122 static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
5124 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
5126 dev_t dev = MKDEV(info->major,info->minor);
5128 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
5131 if (!mddev->raid_disks) {
5133 /* expecting a device which has a superblock */
5134 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
5137 "md: md_import_device returned %ld\n",
5139 return PTR_ERR(rdev);
5141 if (!list_empty(&mddev->disks)) {
5142 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
5143 mdk_rdev_t, same_set);
5144 err = super_types[mddev->major_version]
5145 .load_super(rdev, rdev0, mddev->minor_version);
5148 "md: %s has different UUID to %s\n",
5149 bdevname(rdev->bdev,b),
5150 bdevname(rdev0->bdev,b2));
5155 err = bind_rdev_to_array(rdev, mddev);
5162 * add_new_disk can be used once the array is assembled
5163 * to add "hot spares". They must already have a superblock
5168 if (!mddev->pers->hot_add_disk) {
5170 "%s: personality does not support diskops!\n",
5174 if (mddev->persistent)
5175 rdev = md_import_device(dev, mddev->major_version,
5176 mddev->minor_version);
5178 rdev = md_import_device(dev, -1, -1);
5181 "md: md_import_device returned %ld\n",
5183 return PTR_ERR(rdev);
5185 /* set saved_raid_disk if appropriate */
5186 if (!mddev->persistent) {
5187 if (info->state & (1<<MD_DISK_SYNC) &&
5188 info->raid_disk < mddev->raid_disks) {
5189 rdev->raid_disk = info->raid_disk;
5190 set_bit(In_sync, &rdev->flags);
5192 rdev->raid_disk = -1;
5194 super_types[mddev->major_version].
5195 validate_super(mddev, rdev);
5196 if (test_bit(In_sync, &rdev->flags))
5197 rdev->saved_raid_disk = rdev->raid_disk;
5199 rdev->saved_raid_disk = -1;
5201 clear_bit(In_sync, &rdev->flags); /* just to be sure */
5202 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
5203 set_bit(WriteMostly, &rdev->flags);
5205 clear_bit(WriteMostly, &rdev->flags);
5207 rdev->raid_disk = -1;
5208 err = bind_rdev_to_array(rdev, mddev);
5209 if (!err && !mddev->pers->hot_remove_disk) {
5210 /* If there is hot_add_disk but no hot_remove_disk
5211 * then added disks for geometry changes,
5212 * and should be added immediately.
5214 super_types[mddev->major_version].
5215 validate_super(mddev, rdev);
5216 err = mddev->pers->hot_add_disk(mddev, rdev);
5218 unbind_rdev_from_array(rdev);
5223 sysfs_notify_dirent_safe(rdev->sysfs_state);
5225 md_update_sb(mddev, 1);
5226 if (mddev->degraded)
5227 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
5228 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5229 md_wakeup_thread(mddev->thread);
5233 /* otherwise, add_new_disk is only allowed
5234 * for major_version==0 superblocks
5236 if (mddev->major_version != 0) {
5237 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
5242 if (!(info->state & (1<<MD_DISK_FAULTY))) {
5244 rdev = md_import_device(dev, -1, 0);
5247 "md: error, md_import_device() returned %ld\n",
5249 return PTR_ERR(rdev);
5251 rdev->desc_nr = info->number;
5252 if (info->raid_disk < mddev->raid_disks)
5253 rdev->raid_disk = info->raid_disk;
5255 rdev->raid_disk = -1;
5257 if (rdev->raid_disk < mddev->raid_disks)
5258 if (info->state & (1<<MD_DISK_SYNC))
5259 set_bit(In_sync, &rdev->flags);
5261 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
5262 set_bit(WriteMostly, &rdev->flags);
5264 if (!mddev->persistent) {
5265 printk(KERN_INFO "md: nonpersistent superblock ...\n");
5266 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
5268 rdev->sb_start = calc_dev_sboffset(rdev);
5269 rdev->sectors = rdev->sb_start;
5271 err = bind_rdev_to_array(rdev, mddev);
5281 static int hot_remove_disk(mddev_t * mddev, dev_t dev)
5283 char b[BDEVNAME_SIZE];
5286 rdev = find_rdev(mddev, dev);
5290 if (rdev->raid_disk >= 0)
5293 kick_rdev_from_array(rdev);
5294 md_update_sb(mddev, 1);
5295 md_new_event(mddev);
5299 printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n",
5300 bdevname(rdev->bdev,b), mdname(mddev));
5304 static int hot_add_disk(mddev_t * mddev, dev_t dev)
5306 char b[BDEVNAME_SIZE];
5313 if (mddev->major_version != 0) {
5314 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
5315 " version-0 superblocks.\n",
5319 if (!mddev->pers->hot_add_disk) {
5321 "%s: personality does not support diskops!\n",
5326 rdev = md_import_device(dev, -1, 0);
5329 "md: error, md_import_device() returned %ld\n",
5334 if (mddev->persistent)
5335 rdev->sb_start = calc_dev_sboffset(rdev);
5337 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
5339 rdev->sectors = rdev->sb_start;
5341 if (test_bit(Faulty, &rdev->flags)) {
5343 "md: can not hot-add faulty %s disk to %s!\n",
5344 bdevname(rdev->bdev,b), mdname(mddev));
5348 clear_bit(In_sync, &rdev->flags);
5350 rdev->saved_raid_disk = -1;
5351 err = bind_rdev_to_array(rdev, mddev);
5356 * The rest should better be atomic, we can have disk failures
5357 * noticed in interrupt contexts ...
5360 rdev->raid_disk = -1;
5362 md_update_sb(mddev, 1);
5365 * Kick recovery, maybe this spare has to be added to the
5366 * array immediately.
5368 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5369 md_wakeup_thread(mddev->thread);
5370 md_new_event(mddev);
5378 static int set_bitmap_file(mddev_t *mddev, int fd)
5383 if (!mddev->pers->quiesce)
5385 if (mddev->recovery || mddev->sync_thread)
5387 /* we should be able to change the bitmap.. */
5393 return -EEXIST; /* cannot add when bitmap is present */
5394 mddev->bitmap_info.file = fget(fd);
5396 if (mddev->bitmap_info.file == NULL) {
5397 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
5402 err = deny_bitmap_write_access(mddev->bitmap_info.file);
5404 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
5406 fput(mddev->bitmap_info.file);
5407 mddev->bitmap_info.file = NULL;
5410 mddev->bitmap_info.offset = 0; /* file overrides offset */
5411 } else if (mddev->bitmap == NULL)
5412 return -ENOENT; /* cannot remove what isn't there */
5415 mddev->pers->quiesce(mddev, 1);
5417 err = bitmap_create(mddev);
5419 err = bitmap_load(mddev);
5421 if (fd < 0 || err) {
5422 bitmap_destroy(mddev);
5423 fd = -1; /* make sure to put the file */
5425 mddev->pers->quiesce(mddev, 0);
5428 if (mddev->bitmap_info.file) {
5429 restore_bitmap_write_access(mddev->bitmap_info.file);
5430 fput(mddev->bitmap_info.file);
5432 mddev->bitmap_info.file = NULL;
5439 * set_array_info is used two different ways
5440 * The original usage is when creating a new array.
5441 * In this usage, raid_disks is > 0 and it together with
5442 * level, size, not_persistent,layout,chunksize determine the
5443 * shape of the array.
5444 * This will always create an array with a type-0.90.0 superblock.
5445 * The newer usage is when assembling an array.
5446 * In this case raid_disks will be 0, and the major_version field is
5447 * use to determine which style super-blocks are to be found on the devices.
5448 * The minor and patch _version numbers are also kept incase the
5449 * super_block handler wishes to interpret them.
5451 static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
5454 if (info->raid_disks == 0) {
5455 /* just setting version number for superblock loading */
5456 if (info->major_version < 0 ||
5457 info->major_version >= ARRAY_SIZE(super_types) ||
5458 super_types[info->major_version].name == NULL) {
5459 /* maybe try to auto-load a module? */
5461 "md: superblock version %d not known\n",
5462 info->major_version);
5465 mddev->major_version = info->major_version;
5466 mddev->minor_version = info->minor_version;
5467 mddev->patch_version = info->patch_version;
5468 mddev->persistent = !info->not_persistent;
5469 /* ensure mddev_put doesn't delete this now that there
5470 * is some minimal configuration.
5472 mddev->ctime = get_seconds();
5475 mddev->major_version = MD_MAJOR_VERSION;
5476 mddev->minor_version = MD_MINOR_VERSION;
5477 mddev->patch_version = MD_PATCHLEVEL_VERSION;
5478 mddev->ctime = get_seconds();
5480 mddev->level = info->level;
5481 mddev->clevel[0] = 0;
5482 mddev->dev_sectors = 2 * (sector_t)info->size;
5483 mddev->raid_disks = info->raid_disks;
5484 /* don't set md_minor, it is determined by which /dev/md* was
5487 if (info->state & (1<<MD_SB_CLEAN))
5488 mddev->recovery_cp = MaxSector;
5490 mddev->recovery_cp = 0;
5491 mddev->persistent = ! info->not_persistent;
5492 mddev->external = 0;
5494 mddev->layout = info->layout;
5495 mddev->chunk_sectors = info->chunk_size >> 9;
5497 mddev->max_disks = MD_SB_DISKS;
5499 if (mddev->persistent)
5501 set_bit(MD_CHANGE_DEVS, &mddev->flags);
5503 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
5504 mddev->bitmap_info.offset = 0;
5506 mddev->reshape_position = MaxSector;
5509 * Generate a 128 bit UUID
5511 get_random_bytes(mddev->uuid, 16);
5513 mddev->new_level = mddev->level;
5514 mddev->new_chunk_sectors = mddev->chunk_sectors;
5515 mddev->new_layout = mddev->layout;
5516 mddev->delta_disks = 0;
5521 void md_set_array_sectors(mddev_t *mddev, sector_t array_sectors)
5523 WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__);
5525 if (mddev->external_size)
5528 mddev->array_sectors = array_sectors;
5530 EXPORT_SYMBOL(md_set_array_sectors);
5532 static int update_size(mddev_t *mddev, sector_t num_sectors)
5536 int fit = (num_sectors == 0);
5538 if (mddev->pers->resize == NULL)
5540 /* The "num_sectors" is the number of sectors of each device that
5541 * is used. This can only make sense for arrays with redundancy.
5542 * linear and raid0 always use whatever space is available. We can only
5543 * consider changing this number if no resync or reconstruction is
5544 * happening, and if the new size is acceptable. It must fit before the
5545 * sb_start or, if that is <data_offset, it must fit before the size
5546 * of each device. If num_sectors is zero, we find the largest size
5549 if (mddev->sync_thread)
5552 /* Sorry, cannot grow a bitmap yet, just remove it,
5556 list_for_each_entry(rdev, &mddev->disks, same_set) {
5557 sector_t avail = rdev->sectors;
5559 if (fit && (num_sectors == 0 || num_sectors > avail))
5560 num_sectors = avail;
5561 if (avail < num_sectors)
5564 rv = mddev->pers->resize(mddev, num_sectors);
5566 revalidate_disk(mddev->gendisk);
5570 static int update_raid_disks(mddev_t *mddev, int raid_disks)
5573 /* change the number of raid disks */
5574 if (mddev->pers->check_reshape == NULL)
5576 if (raid_disks <= 0 ||
5577 (mddev->max_disks && raid_disks >= mddev->max_disks))
5579 if (mddev->sync_thread || mddev->reshape_position != MaxSector)
5581 mddev->delta_disks = raid_disks - mddev->raid_disks;
5583 rv = mddev->pers->check_reshape(mddev);
5585 mddev->delta_disks = 0;
5591 * update_array_info is used to change the configuration of an
5593 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
5594 * fields in the info are checked against the array.
5595 * Any differences that cannot be handled will cause an error.
5596 * Normally, only one change can be managed at a time.
5598 static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
5604 /* calculate expected state,ignoring low bits */
5605 if (mddev->bitmap && mddev->bitmap_info.offset)
5606 state |= (1 << MD_SB_BITMAP_PRESENT);
5608 if (mddev->major_version != info->major_version ||
5609 mddev->minor_version != info->minor_version ||
5610 /* mddev->patch_version != info->patch_version || */
5611 mddev->ctime != info->ctime ||
5612 mddev->level != info->level ||
5613 /* mddev->layout != info->layout || */
5614 !mddev->persistent != info->not_persistent||
5615 mddev->chunk_sectors != info->chunk_size >> 9 ||
5616 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
5617 ((state^info->state) & 0xfffffe00)
5620 /* Check there is only one change */
5621 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
5623 if (mddev->raid_disks != info->raid_disks)
5625 if (mddev->layout != info->layout)
5627 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT))
5634 if (mddev->layout != info->layout) {
5636 * we don't need to do anything at the md level, the
5637 * personality will take care of it all.
5639 if (mddev->pers->check_reshape == NULL)
5642 mddev->new_layout = info->layout;
5643 rv = mddev->pers->check_reshape(mddev);
5645 mddev->new_layout = mddev->layout;
5649 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
5650 rv = update_size(mddev, (sector_t)info->size * 2);
5652 if (mddev->raid_disks != info->raid_disks)
5653 rv = update_raid_disks(mddev, info->raid_disks);
5655 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
5656 if (mddev->pers->quiesce == NULL)
5658 if (mddev->recovery || mddev->sync_thread)
5660 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
5661 /* add the bitmap */
5664 if (mddev->bitmap_info.default_offset == 0)
5666 mddev->bitmap_info.offset =
5667 mddev->bitmap_info.default_offset;
5668 mddev->pers->quiesce(mddev, 1);
5669 rv = bitmap_create(mddev);
5671 rv = bitmap_load(mddev);
5673 bitmap_destroy(mddev);
5674 mddev->pers->quiesce(mddev, 0);
5676 /* remove the bitmap */
5679 if (mddev->bitmap->file)
5681 mddev->pers->quiesce(mddev, 1);
5682 bitmap_destroy(mddev);
5683 mddev->pers->quiesce(mddev, 0);
5684 mddev->bitmap_info.offset = 0;
5687 md_update_sb(mddev, 1);
5691 static int set_disk_faulty(mddev_t *mddev, dev_t dev)
5695 if (mddev->pers == NULL)
5698 rdev = find_rdev(mddev, dev);
5702 md_error(mddev, rdev);
5707 * We have a problem here : there is no easy way to give a CHS
5708 * virtual geometry. We currently pretend that we have a 2 heads
5709 * 4 sectors (with a BIG number of cylinders...). This drives
5710 * dosfs just mad... ;-)
5712 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
5714 mddev_t *mddev = bdev->bd_disk->private_data;
5718 geo->cylinders = mddev->array_sectors / 8;
5722 static int md_ioctl(struct block_device *bdev, fmode_t mode,
5723 unsigned int cmd, unsigned long arg)
5726 void __user *argp = (void __user *)arg;
5727 mddev_t *mddev = NULL;
5730 if (!capable(CAP_SYS_ADMIN))
5734 * Commands dealing with the RAID driver but not any
5740 err = get_version(argp);
5743 case PRINT_RAID_DEBUG:
5751 autostart_arrays(arg);
5758 * Commands creating/starting a new array:
5761 mddev = bdev->bd_disk->private_data;
5768 err = mddev_lock(mddev);
5771 "md: ioctl lock interrupted, reason %d, cmd %d\n",
5778 case SET_ARRAY_INFO:
5780 mdu_array_info_t info;
5782 memset(&info, 0, sizeof(info));
5783 else if (copy_from_user(&info, argp, sizeof(info))) {
5788 err = update_array_info(mddev, &info);
5790 printk(KERN_WARNING "md: couldn't update"
5791 " array info. %d\n", err);
5796 if (!list_empty(&mddev->disks)) {
5798 "md: array %s already has disks!\n",
5803 if (mddev->raid_disks) {
5805 "md: array %s already initialised!\n",
5810 err = set_array_info(mddev, &info);
5812 printk(KERN_WARNING "md: couldn't set"
5813 " array info. %d\n", err);
5823 * Commands querying/configuring an existing array:
5825 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
5826 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
5827 if ((!mddev->raid_disks && !mddev->external)
5828 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
5829 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
5830 && cmd != GET_BITMAP_FILE) {
5836 * Commands even a read-only array can execute:
5840 case GET_ARRAY_INFO:
5841 err = get_array_info(mddev, argp);
5844 case GET_BITMAP_FILE:
5845 err = get_bitmap_file(mddev, argp);
5849 err = get_disk_info(mddev, argp);
5852 case RESTART_ARRAY_RW:
5853 err = restart_array(mddev);
5857 err = do_md_stop(mddev, 0, 1);
5861 err = md_set_readonly(mddev, 1);
5865 if (get_user(ro, (int __user *)(arg))) {
5871 /* if the bdev is going readonly the value of mddev->ro
5872 * does not matter, no writes are coming
5877 /* are we are already prepared for writes? */
5881 /* transitioning to readauto need only happen for
5882 * arrays that call md_write_start
5885 err = restart_array(mddev);
5888 set_disk_ro(mddev->gendisk, 0);
5895 * The remaining ioctls are changing the state of the
5896 * superblock, so we do not allow them on read-only arrays.
5897 * However non-MD ioctls (e.g. get-size) will still come through
5898 * here and hit the 'default' below, so only disallow
5899 * 'md' ioctls, and switch to rw mode if started auto-readonly.
5901 if (_IOC_TYPE(cmd) == MD_MAJOR && mddev->ro && mddev->pers) {
5902 if (mddev->ro == 2) {
5904 sysfs_notify_dirent_safe(mddev->sysfs_state);
5905 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5906 md_wakeup_thread(mddev->thread);
5917 mdu_disk_info_t info;
5918 if (copy_from_user(&info, argp, sizeof(info)))
5921 err = add_new_disk(mddev, &info);
5925 case HOT_REMOVE_DISK:
5926 err = hot_remove_disk(mddev, new_decode_dev(arg));
5930 err = hot_add_disk(mddev, new_decode_dev(arg));
5933 case SET_DISK_FAULTY:
5934 err = set_disk_faulty(mddev, new_decode_dev(arg));
5938 err = do_md_run(mddev);
5941 case SET_BITMAP_FILE:
5942 err = set_bitmap_file(mddev, (int)arg);
5952 if (mddev->hold_active == UNTIL_IOCTL &&
5954 mddev->hold_active = 0;
5955 mddev_unlock(mddev);
5964 #ifdef CONFIG_COMPAT
5965 static int md_compat_ioctl(struct block_device *bdev, fmode_t mode,
5966 unsigned int cmd, unsigned long arg)
5969 case HOT_REMOVE_DISK:
5971 case SET_DISK_FAULTY:
5972 case SET_BITMAP_FILE:
5973 /* These take in integer arg, do not convert */
5976 arg = (unsigned long)compat_ptr(arg);
5980 return md_ioctl(bdev, mode, cmd, arg);
5982 #endif /* CONFIG_COMPAT */
5984 static int md_open(struct block_device *bdev, fmode_t mode)
5987 * Succeed if we can lock the mddev, which confirms that
5988 * it isn't being stopped right now.
5990 mddev_t *mddev = mddev_find(bdev->bd_dev);
5993 if (mddev->gendisk != bdev->bd_disk) {
5994 /* we are racing with mddev_put which is discarding this
5998 /* Wait until bdev->bd_disk is definitely gone */
5999 flush_workqueue(md_misc_wq);
6000 /* Then retry the open from the top */
6001 return -ERESTARTSYS;
6003 BUG_ON(mddev != bdev->bd_disk->private_data);
6005 if ((err = mutex_lock_interruptible(&mddev->open_mutex)))
6009 atomic_inc(&mddev->openers);
6010 mutex_unlock(&mddev->open_mutex);
6012 check_disk_size_change(mddev->gendisk, bdev);
6017 static int md_release(struct gendisk *disk, fmode_t mode)
6019 mddev_t *mddev = disk->private_data;
6022 atomic_dec(&mddev->openers);
6027 static const struct block_device_operations md_fops =
6029 .owner = THIS_MODULE,
6031 .release = md_release,
6033 #ifdef CONFIG_COMPAT
6034 .compat_ioctl = md_compat_ioctl,
6036 .getgeo = md_getgeo,
6039 static int md_thread(void * arg)
6041 mdk_thread_t *thread = arg;
6044 * md_thread is a 'system-thread', it's priority should be very
6045 * high. We avoid resource deadlocks individually in each
6046 * raid personality. (RAID5 does preallocation) We also use RR and
6047 * the very same RT priority as kswapd, thus we will never get
6048 * into a priority inversion deadlock.
6050 * we definitely have to have equal or higher priority than
6051 * bdflush, otherwise bdflush will deadlock if there are too
6052 * many dirty RAID5 blocks.
6055 allow_signal(SIGKILL);
6056 while (!kthread_should_stop()) {
6058 /* We need to wait INTERRUPTIBLE so that
6059 * we don't add to the load-average.
6060 * That means we need to be sure no signals are
6063 if (signal_pending(current))
6064 flush_signals(current);
6066 wait_event_interruptible_timeout
6068 test_bit(THREAD_WAKEUP, &thread->flags)
6069 || kthread_should_stop(),
6072 clear_bit(THREAD_WAKEUP, &thread->flags);
6073 if (!kthread_should_stop())
6074 thread->run(thread->mddev);
6080 void md_wakeup_thread(mdk_thread_t *thread)
6083 dprintk("md: waking up MD thread %s.\n", thread->tsk->comm);
6084 set_bit(THREAD_WAKEUP, &thread->flags);
6085 wake_up(&thread->wqueue);
6089 mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
6092 mdk_thread_t *thread;
6094 thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL);
6098 init_waitqueue_head(&thread->wqueue);
6101 thread->mddev = mddev;
6102 thread->timeout = MAX_SCHEDULE_TIMEOUT;
6103 thread->tsk = kthread_run(md_thread, thread,
6105 mdname(thread->mddev),
6106 name ?: mddev->pers->name);
6107 if (IS_ERR(thread->tsk)) {
6114 void md_unregister_thread(mdk_thread_t *thread)
6118 dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
6120 kthread_stop(thread->tsk);
6124 void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
6131 if (!rdev || test_bit(Faulty, &rdev->flags))
6134 if (mddev->external)
6135 set_bit(Blocked, &rdev->flags);
6137 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
6139 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
6140 __builtin_return_address(0),__builtin_return_address(1),
6141 __builtin_return_address(2),__builtin_return_address(3));
6145 if (!mddev->pers->error_handler)
6147 mddev->pers->error_handler(mddev,rdev);
6148 if (mddev->degraded)
6149 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6150 sysfs_notify_dirent_safe(rdev->sysfs_state);
6151 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6152 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6153 md_wakeup_thread(mddev->thread);
6154 if (mddev->event_work.func)
6155 queue_work(md_misc_wq, &mddev->event_work);
6156 md_new_event_inintr(mddev);
6159 /* seq_file implementation /proc/mdstat */
6161 static void status_unused(struct seq_file *seq)
6166 seq_printf(seq, "unused devices: ");
6168 list_for_each_entry(rdev, &pending_raid_disks, same_set) {
6169 char b[BDEVNAME_SIZE];
6171 seq_printf(seq, "%s ",
6172 bdevname(rdev->bdev,b));
6175 seq_printf(seq, "<none>");
6177 seq_printf(seq, "\n");
6181 static void status_resync(struct seq_file *seq, mddev_t * mddev)
6183 sector_t max_sectors, resync, res;
6184 unsigned long dt, db;
6187 unsigned int per_milli;
6189 resync = mddev->curr_resync - atomic_read(&mddev->recovery_active);
6191 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
6192 max_sectors = mddev->resync_max_sectors;
6194 max_sectors = mddev->dev_sectors;
6197 * Should not happen.
6203 /* Pick 'scale' such that (resync>>scale)*1000 will fit
6204 * in a sector_t, and (max_sectors>>scale) will fit in a
6205 * u32, as those are the requirements for sector_div.
6206 * Thus 'scale' must be at least 10
6209 if (sizeof(sector_t) > sizeof(unsigned long)) {
6210 while ( max_sectors/2 > (1ULL<<(scale+32)))
6213 res = (resync>>scale)*1000;
6214 sector_div(res, (u32)((max_sectors>>scale)+1));
6218 int i, x = per_milli/50, y = 20-x;
6219 seq_printf(seq, "[");
6220 for (i = 0; i < x; i++)
6221 seq_printf(seq, "=");
6222 seq_printf(seq, ">");
6223 for (i = 0; i < y; i++)
6224 seq_printf(seq, ".");
6225 seq_printf(seq, "] ");
6227 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
6228 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
6230 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
6232 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
6233 "resync" : "recovery"))),
6234 per_milli/10, per_milli % 10,
6235 (unsigned long long) resync/2,
6236 (unsigned long long) max_sectors/2);
6239 * dt: time from mark until now
6240 * db: blocks written from mark until now
6241 * rt: remaining time
6243 * rt is a sector_t, so could be 32bit or 64bit.
6244 * So we divide before multiply in case it is 32bit and close
6246 * We scale the divisor (db) by 32 to avoid loosing precision
6247 * near the end of resync when the number of remaining sectors
6249 * We then divide rt by 32 after multiplying by db to compensate.
6250 * The '+1' avoids division by zero if db is very small.
6252 dt = ((jiffies - mddev->resync_mark) / HZ);
6254 db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active))
6255 - mddev->resync_mark_cnt;
6257 rt = max_sectors - resync; /* number of remaining sectors */
6258 sector_div(rt, db/32+1);
6262 seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60,
6263 ((unsigned long)rt % 60)/6);
6265 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
6268 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
6270 struct list_head *tmp;
6280 spin_lock(&all_mddevs_lock);
6281 list_for_each(tmp,&all_mddevs)
6283 mddev = list_entry(tmp, mddev_t, all_mddevs);
6285 spin_unlock(&all_mddevs_lock);
6288 spin_unlock(&all_mddevs_lock);
6290 return (void*)2;/* tail */
6294 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
6296 struct list_head *tmp;
6297 mddev_t *next_mddev, *mddev = v;
6303 spin_lock(&all_mddevs_lock);
6305 tmp = all_mddevs.next;
6307 tmp = mddev->all_mddevs.next;
6308 if (tmp != &all_mddevs)
6309 next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs));
6311 next_mddev = (void*)2;
6314 spin_unlock(&all_mddevs_lock);
6322 static void md_seq_stop(struct seq_file *seq, void *v)
6326 if (mddev && v != (void*)1 && v != (void*)2)
6330 struct mdstat_info {
6334 static int md_seq_show(struct seq_file *seq, void *v)
6339 struct mdstat_info *mi = seq->private;
6340 struct bitmap *bitmap;
6342 if (v == (void*)1) {
6343 struct mdk_personality *pers;
6344 seq_printf(seq, "Personalities : ");
6345 spin_lock(&pers_lock);
6346 list_for_each_entry(pers, &pers_list, list)
6347 seq_printf(seq, "[%s] ", pers->name);
6349 spin_unlock(&pers_lock);
6350 seq_printf(seq, "\n");
6351 mi->event = atomic_read(&md_event_count);
6354 if (v == (void*)2) {
6359 if (mddev_lock(mddev) < 0)
6362 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
6363 seq_printf(seq, "%s : %sactive", mdname(mddev),
6364 mddev->pers ? "" : "in");
6367 seq_printf(seq, " (read-only)");
6369 seq_printf(seq, " (auto-read-only)");
6370 seq_printf(seq, " %s", mddev->pers->name);
6374 list_for_each_entry(rdev, &mddev->disks, same_set) {
6375 char b[BDEVNAME_SIZE];
6376 seq_printf(seq, " %s[%d]",
6377 bdevname(rdev->bdev,b), rdev->desc_nr);
6378 if (test_bit(WriteMostly, &rdev->flags))
6379 seq_printf(seq, "(W)");
6380 if (test_bit(Faulty, &rdev->flags)) {
6381 seq_printf(seq, "(F)");
6383 } else if (rdev->raid_disk < 0)
6384 seq_printf(seq, "(S)"); /* spare */
6385 sectors += rdev->sectors;
6388 if (!list_empty(&mddev->disks)) {
6390 seq_printf(seq, "\n %llu blocks",
6391 (unsigned long long)
6392 mddev->array_sectors / 2);
6394 seq_printf(seq, "\n %llu blocks",
6395 (unsigned long long)sectors / 2);
6397 if (mddev->persistent) {
6398 if (mddev->major_version != 0 ||
6399 mddev->minor_version != 90) {
6400 seq_printf(seq," super %d.%d",
6401 mddev->major_version,
6402 mddev->minor_version);
6404 } else if (mddev->external)
6405 seq_printf(seq, " super external:%s",
6406 mddev->metadata_type);
6408 seq_printf(seq, " super non-persistent");
6411 mddev->pers->status(seq, mddev);
6412 seq_printf(seq, "\n ");
6413 if (mddev->pers->sync_request) {
6414 if (mddev->curr_resync > 2) {
6415 status_resync(seq, mddev);
6416 seq_printf(seq, "\n ");
6417 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
6418 seq_printf(seq, "\tresync=DELAYED\n ");
6419 else if (mddev->recovery_cp < MaxSector)
6420 seq_printf(seq, "\tresync=PENDING\n ");
6423 seq_printf(seq, "\n ");
6425 if ((bitmap = mddev->bitmap)) {
6426 unsigned long chunk_kb;
6427 unsigned long flags;
6428 spin_lock_irqsave(&bitmap->lock, flags);
6429 chunk_kb = mddev->bitmap_info.chunksize >> 10;
6430 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
6432 bitmap->pages - bitmap->missing_pages,
6434 (bitmap->pages - bitmap->missing_pages)
6435 << (PAGE_SHIFT - 10),
6436 chunk_kb ? chunk_kb : mddev->bitmap_info.chunksize,
6437 chunk_kb ? "KB" : "B");
6439 seq_printf(seq, ", file: ");
6440 seq_path(seq, &bitmap->file->f_path, " \t\n");
6443 seq_printf(seq, "\n");
6444 spin_unlock_irqrestore(&bitmap->lock, flags);
6447 seq_printf(seq, "\n");
6449 mddev_unlock(mddev);
6454 static const struct seq_operations md_seq_ops = {
6455 .start = md_seq_start,
6456 .next = md_seq_next,
6457 .stop = md_seq_stop,
6458 .show = md_seq_show,
6461 static int md_seq_open(struct inode *inode, struct file *file)
6464 struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL);
6468 error = seq_open(file, &md_seq_ops);
6472 struct seq_file *p = file->private_data;
6474 mi->event = atomic_read(&md_event_count);
6479 static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
6481 struct seq_file *m = filp->private_data;
6482 struct mdstat_info *mi = m->private;
6485 poll_wait(filp, &md_event_waiters, wait);
6487 /* always allow read */
6488 mask = POLLIN | POLLRDNORM;
6490 if (mi->event != atomic_read(&md_event_count))
6491 mask |= POLLERR | POLLPRI;
6495 static const struct file_operations md_seq_fops = {
6496 .owner = THIS_MODULE,
6497 .open = md_seq_open,
6499 .llseek = seq_lseek,
6500 .release = seq_release_private,
6501 .poll = mdstat_poll,
6504 int register_md_personality(struct mdk_personality *p)
6506 spin_lock(&pers_lock);
6507 list_add_tail(&p->list, &pers_list);
6508 printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level);
6509 spin_unlock(&pers_lock);
6513 int unregister_md_personality(struct mdk_personality *p)
6515 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
6516 spin_lock(&pers_lock);
6517 list_del_init(&p->list);
6518 spin_unlock(&pers_lock);
6522 static int is_mddev_idle(mddev_t *mddev, int init)
6530 rdev_for_each_rcu(rdev, mddev) {
6531 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
6532 curr_events = (int)part_stat_read(&disk->part0, sectors[0]) +
6533 (int)part_stat_read(&disk->part0, sectors[1]) -
6534 atomic_read(&disk->sync_io);
6535 /* sync IO will cause sync_io to increase before the disk_stats
6536 * as sync_io is counted when a request starts, and
6537 * disk_stats is counted when it completes.
6538 * So resync activity will cause curr_events to be smaller than
6539 * when there was no such activity.
6540 * non-sync IO will cause disk_stat to increase without
6541 * increasing sync_io so curr_events will (eventually)
6542 * be larger than it was before. Once it becomes
6543 * substantially larger, the test below will cause
6544 * the array to appear non-idle, and resync will slow
6546 * If there is a lot of outstanding resync activity when
6547 * we set last_event to curr_events, then all that activity
6548 * completing might cause the array to appear non-idle
6549 * and resync will be slowed down even though there might
6550 * not have been non-resync activity. This will only
6551 * happen once though. 'last_events' will soon reflect
6552 * the state where there is little or no outstanding
6553 * resync requests, and further resync activity will
6554 * always make curr_events less than last_events.
6557 if (init || curr_events - rdev->last_events > 64) {
6558 rdev->last_events = curr_events;
6566 void md_done_sync(mddev_t *mddev, int blocks, int ok)
6568 /* another "blocks" (512byte) blocks have been synced */
6569 atomic_sub(blocks, &mddev->recovery_active);
6570 wake_up(&mddev->recovery_wait);
6572 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6573 md_wakeup_thread(mddev->thread);
6574 // stop recovery, signal do_sync ....
6579 /* md_write_start(mddev, bi)
6580 * If we need to update some array metadata (e.g. 'active' flag
6581 * in superblock) before writing, schedule a superblock update
6582 * and wait for it to complete.
6584 void md_write_start(mddev_t *mddev, struct bio *bi)
6587 if (bio_data_dir(bi) != WRITE)
6590 BUG_ON(mddev->ro == 1);
6591 if (mddev->ro == 2) {
6592 /* need to switch to read/write */
6594 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6595 md_wakeup_thread(mddev->thread);
6596 md_wakeup_thread(mddev->sync_thread);
6599 atomic_inc(&mddev->writes_pending);
6600 if (mddev->safemode == 1)
6601 mddev->safemode = 0;
6602 if (mddev->in_sync) {
6603 spin_lock_irq(&mddev->write_lock);
6604 if (mddev->in_sync) {
6606 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6607 set_bit(MD_CHANGE_PENDING, &mddev->flags);
6608 md_wakeup_thread(mddev->thread);
6611 spin_unlock_irq(&mddev->write_lock);
6614 sysfs_notify_dirent_safe(mddev->sysfs_state);
6615 wait_event(mddev->sb_wait,
6616 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
6619 void md_write_end(mddev_t *mddev)
6621 if (atomic_dec_and_test(&mddev->writes_pending)) {
6622 if (mddev->safemode == 2)
6623 md_wakeup_thread(mddev->thread);
6624 else if (mddev->safemode_delay)
6625 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
6629 /* md_allow_write(mddev)
6630 * Calling this ensures that the array is marked 'active' so that writes
6631 * may proceed without blocking. It is important to call this before
6632 * attempting a GFP_KERNEL allocation while holding the mddev lock.
6633 * Must be called with mddev_lock held.
6635 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
6636 * is dropped, so return -EAGAIN after notifying userspace.
6638 int md_allow_write(mddev_t *mddev)
6644 if (!mddev->pers->sync_request)
6647 spin_lock_irq(&mddev->write_lock);
6648 if (mddev->in_sync) {
6650 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6651 set_bit(MD_CHANGE_PENDING, &mddev->flags);
6652 if (mddev->safemode_delay &&
6653 mddev->safemode == 0)
6654 mddev->safemode = 1;
6655 spin_unlock_irq(&mddev->write_lock);
6656 md_update_sb(mddev, 0);
6657 sysfs_notify_dirent_safe(mddev->sysfs_state);
6659 spin_unlock_irq(&mddev->write_lock);
6661 if (test_bit(MD_CHANGE_PENDING, &mddev->flags))
6666 EXPORT_SYMBOL_GPL(md_allow_write);
6668 void md_unplug(mddev_t *mddev)
6671 mddev->plug->unplug_fn(mddev->plug);
6674 #define SYNC_MARKS 10
6675 #define SYNC_MARK_STEP (3*HZ)
6676 void md_do_sync(mddev_t *mddev)
6679 unsigned int currspeed = 0,
6681 sector_t max_sectors,j, io_sectors;
6682 unsigned long mark[SYNC_MARKS];
6683 sector_t mark_cnt[SYNC_MARKS];
6685 struct list_head *tmp;
6686 sector_t last_check;
6691 /* just incase thread restarts... */
6692 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
6694 if (mddev->ro) /* never try to sync a read-only array */
6697 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
6698 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
6699 desc = "data-check";
6700 else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
6701 desc = "requested-resync";
6704 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
6709 /* we overload curr_resync somewhat here.
6710 * 0 == not engaged in resync at all
6711 * 2 == checking that there is no conflict with another sync
6712 * 1 == like 2, but have yielded to allow conflicting resync to
6714 * other == active in resync - this many blocks
6716 * Before starting a resync we must have set curr_resync to
6717 * 2, and then checked that every "conflicting" array has curr_resync
6718 * less than ours. When we find one that is the same or higher
6719 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
6720 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
6721 * This will mean we have to start checking from the beginning again.
6726 mddev->curr_resync = 2;
6729 if (kthread_should_stop())
6730 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6732 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
6734 for_each_mddev(mddev2, tmp) {
6735 if (mddev2 == mddev)
6737 if (!mddev->parallel_resync
6738 && mddev2->curr_resync
6739 && match_mddev_units(mddev, mddev2)) {
6741 if (mddev < mddev2 && mddev->curr_resync == 2) {
6742 /* arbitrarily yield */
6743 mddev->curr_resync = 1;
6744 wake_up(&resync_wait);
6746 if (mddev > mddev2 && mddev->curr_resync == 1)
6747 /* no need to wait here, we can wait the next
6748 * time 'round when curr_resync == 2
6751 /* We need to wait 'interruptible' so as not to
6752 * contribute to the load average, and not to
6753 * be caught by 'softlockup'
6755 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
6756 if (!kthread_should_stop() &&
6757 mddev2->curr_resync >= mddev->curr_resync) {
6758 printk(KERN_INFO "md: delaying %s of %s"
6759 " until %s has finished (they"
6760 " share one or more physical units)\n",
6761 desc, mdname(mddev), mdname(mddev2));
6763 if (signal_pending(current))
6764 flush_signals(current);
6766 finish_wait(&resync_wait, &wq);
6769 finish_wait(&resync_wait, &wq);
6772 } while (mddev->curr_resync < 2);
6775 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
6776 /* resync follows the size requested by the personality,
6777 * which defaults to physical size, but can be virtual size
6779 max_sectors = mddev->resync_max_sectors;
6780 mddev->resync_mismatches = 0;
6781 /* we don't use the checkpoint if there's a bitmap */
6782 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
6783 j = mddev->resync_min;
6784 else if (!mddev->bitmap)
6785 j = mddev->recovery_cp;
6787 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
6788 max_sectors = mddev->dev_sectors;
6790 /* recovery follows the physical size of devices */
6791 max_sectors = mddev->dev_sectors;
6794 list_for_each_entry_rcu(rdev, &mddev->disks, same_set)
6795 if (rdev->raid_disk >= 0 &&
6796 !test_bit(Faulty, &rdev->flags) &&
6797 !test_bit(In_sync, &rdev->flags) &&
6798 rdev->recovery_offset < j)
6799 j = rdev->recovery_offset;
6803 printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev));
6804 printk(KERN_INFO "md: minimum _guaranteed_ speed:"
6805 " %d KB/sec/disk.\n", speed_min(mddev));
6806 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
6807 "(but not more than %d KB/sec) for %s.\n",
6808 speed_max(mddev), desc);
6810 is_mddev_idle(mddev, 1); /* this initializes IO event counters */
6813 for (m = 0; m < SYNC_MARKS; m++) {
6815 mark_cnt[m] = io_sectors;
6818 mddev->resync_mark = mark[last_mark];
6819 mddev->resync_mark_cnt = mark_cnt[last_mark];
6822 * Tune reconstruction:
6824 window = 32*(PAGE_SIZE/512);
6825 printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n",
6826 window/2,(unsigned long long) max_sectors/2);
6828 atomic_set(&mddev->recovery_active, 0);
6833 "md: resuming %s of %s from checkpoint.\n",
6834 desc, mdname(mddev));
6835 mddev->curr_resync = j;
6837 mddev->curr_resync_completed = j;
6839 while (j < max_sectors) {
6844 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
6845 ((mddev->curr_resync > mddev->curr_resync_completed &&
6846 (mddev->curr_resync - mddev->curr_resync_completed)
6847 > (max_sectors >> 4)) ||
6848 (j - mddev->curr_resync_completed)*2
6849 >= mddev->resync_max - mddev->curr_resync_completed
6851 /* time to update curr_resync_completed */
6852 wait_event(mddev->recovery_wait,
6853 atomic_read(&mddev->recovery_active) == 0);
6854 mddev->curr_resync_completed = j;
6855 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6856 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
6859 while (j >= mddev->resync_max && !kthread_should_stop()) {
6860 /* As this condition is controlled by user-space,
6861 * we can block indefinitely, so use '_interruptible'
6862 * to avoid triggering warnings.
6864 flush_signals(current); /* just in case */
6865 wait_event_interruptible(mddev->recovery_wait,
6866 mddev->resync_max > j
6867 || kthread_should_stop());
6870 if (kthread_should_stop())
6873 sectors = mddev->pers->sync_request(mddev, j, &skipped,
6874 currspeed < speed_min(mddev));
6876 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6880 if (!skipped) { /* actual IO requested */
6881 io_sectors += sectors;
6882 atomic_add(sectors, &mddev->recovery_active);
6886 if (j>1) mddev->curr_resync = j;
6887 mddev->curr_mark_cnt = io_sectors;
6888 if (last_check == 0)
6889 /* this is the earliers that rebuilt will be
6890 * visible in /proc/mdstat
6892 md_new_event(mddev);
6894 if (last_check + window > io_sectors || j == max_sectors)
6897 last_check = io_sectors;
6899 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
6903 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
6905 int next = (last_mark+1) % SYNC_MARKS;
6907 mddev->resync_mark = mark[next];
6908 mddev->resync_mark_cnt = mark_cnt[next];
6909 mark[next] = jiffies;
6910 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
6915 if (kthread_should_stop())
6920 * this loop exits only if either when we are slower than
6921 * the 'hard' speed limit, or the system was IO-idle for
6923 * the system might be non-idle CPU-wise, but we only care
6924 * about not overloading the IO subsystem. (things like an
6925 * e2fsck being done on the RAID array should execute fast)
6929 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
6930 /((jiffies-mddev->resync_mark)/HZ +1) +1;
6932 if (currspeed > speed_min(mddev)) {
6933 if ((currspeed > speed_max(mddev)) ||
6934 !is_mddev_idle(mddev, 0)) {
6940 printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc);
6942 * this also signals 'finished resyncing' to md_stop
6945 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
6947 /* tell personality that we are finished */
6948 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
6950 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
6951 mddev->curr_resync > 2) {
6952 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
6953 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
6954 if (mddev->curr_resync >= mddev->recovery_cp) {
6956 "md: checkpointing %s of %s.\n",
6957 desc, mdname(mddev));
6958 mddev->recovery_cp = mddev->curr_resync;
6961 mddev->recovery_cp = MaxSector;
6963 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
6964 mddev->curr_resync = MaxSector;
6966 list_for_each_entry_rcu(rdev, &mddev->disks, same_set)
6967 if (rdev->raid_disk >= 0 &&
6968 mddev->delta_disks >= 0 &&
6969 !test_bit(Faulty, &rdev->flags) &&
6970 !test_bit(In_sync, &rdev->flags) &&
6971 rdev->recovery_offset < mddev->curr_resync)
6972 rdev->recovery_offset = mddev->curr_resync;
6976 set_bit(MD_CHANGE_DEVS, &mddev->flags);
6979 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
6980 /* We completed so min/max setting can be forgotten if used. */
6981 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
6982 mddev->resync_min = 0;
6983 mddev->resync_max = MaxSector;
6984 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
6985 mddev->resync_min = mddev->curr_resync_completed;
6986 mddev->curr_resync = 0;
6987 wake_up(&resync_wait);
6988 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
6989 md_wakeup_thread(mddev->thread);
6994 * got a signal, exit.
6997 "md: md_do_sync() got signal ... exiting\n");
6998 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7002 EXPORT_SYMBOL_GPL(md_do_sync);
7005 static int remove_and_add_spares(mddev_t *mddev)
7010 mddev->curr_resync_completed = 0;
7012 list_for_each_entry(rdev, &mddev->disks, same_set)
7013 if (rdev->raid_disk >= 0 &&
7014 !test_bit(Blocked, &rdev->flags) &&
7015 (test_bit(Faulty, &rdev->flags) ||
7016 ! test_bit(In_sync, &rdev->flags)) &&
7017 atomic_read(&rdev->nr_pending)==0) {
7018 if (mddev->pers->hot_remove_disk(
7019 mddev, rdev->raid_disk)==0) {
7021 sprintf(nm,"rd%d", rdev->raid_disk);
7022 sysfs_remove_link(&mddev->kobj, nm);
7023 rdev->raid_disk = -1;
7027 if (mddev->degraded && !mddev->recovery_disabled) {
7028 list_for_each_entry(rdev, &mddev->disks, same_set) {
7029 if (rdev->raid_disk >= 0 &&
7030 !test_bit(In_sync, &rdev->flags) &&
7031 !test_bit(Blocked, &rdev->flags))
7033 if (rdev->raid_disk < 0
7034 && !test_bit(Faulty, &rdev->flags)) {
7035 rdev->recovery_offset = 0;
7037 hot_add_disk(mddev, rdev) == 0) {
7039 sprintf(nm, "rd%d", rdev->raid_disk);
7040 if (sysfs_create_link(&mddev->kobj,
7042 /* failure here is OK */;
7044 md_new_event(mddev);
7045 set_bit(MD_CHANGE_DEVS, &mddev->flags);
7054 static void reap_sync_thread(mddev_t *mddev)
7058 /* resync has finished, collect result */
7059 md_unregister_thread(mddev->sync_thread);
7060 mddev->sync_thread = NULL;
7061 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
7062 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
7064 /* activate any spares */
7065 if (mddev->pers->spare_active(mddev))
7066 sysfs_notify(&mddev->kobj, NULL,
7069 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
7070 mddev->pers->finish_reshape)
7071 mddev->pers->finish_reshape(mddev);
7072 md_update_sb(mddev, 1);
7074 /* if array is no-longer degraded, then any saved_raid_disk
7075 * information must be scrapped
7077 if (!mddev->degraded)
7078 list_for_each_entry(rdev, &mddev->disks, same_set)
7079 rdev->saved_raid_disk = -1;
7081 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7082 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7083 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
7084 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
7085 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
7086 /* flag recovery needed just to double check */
7087 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7088 sysfs_notify_dirent_safe(mddev->sysfs_action);
7089 md_new_event(mddev);
7093 * This routine is regularly called by all per-raid-array threads to
7094 * deal with generic issues like resync and super-block update.
7095 * Raid personalities that don't have a thread (linear/raid0) do not
7096 * need this as they never do any recovery or update the superblock.
7098 * It does not do any resync itself, but rather "forks" off other threads
7099 * to do that as needed.
7100 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
7101 * "->recovery" and create a thread at ->sync_thread.
7102 * When the thread finishes it sets MD_RECOVERY_DONE
7103 * and wakeups up this thread which will reap the thread and finish up.
7104 * This thread also removes any faulty devices (with nr_pending == 0).
7106 * The overall approach is:
7107 * 1/ if the superblock needs updating, update it.
7108 * 2/ If a recovery thread is running, don't do anything else.
7109 * 3/ If recovery has finished, clean up, possibly marking spares active.
7110 * 4/ If there are any faulty devices, remove them.
7111 * 5/ If array is degraded, try to add spares devices
7112 * 6/ If array has spares or is not in-sync, start a resync thread.
7114 void md_check_recovery(mddev_t *mddev)
7117 bitmap_daemon_work(mddev);
7122 if (signal_pending(current)) {
7123 if (mddev->pers->sync_request && !mddev->external) {
7124 printk(KERN_INFO "md: %s in immediate safe mode\n",
7126 mddev->safemode = 2;
7128 flush_signals(current);
7131 if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
7134 (mddev->flags & ~ (1<<MD_CHANGE_PENDING)) ||
7135 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
7136 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
7137 (mddev->external == 0 && mddev->safemode == 1) ||
7138 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
7139 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
7143 if (mddev_trylock(mddev)) {
7147 /* Only thing we do on a ro array is remove
7151 list_for_each_entry(rdev, &mddev->disks, same_set)
7152 if (rdev->raid_disk >= 0 &&
7153 !test_bit(Blocked, &rdev->flags) &&
7154 test_bit(Faulty, &rdev->flags) &&
7155 atomic_read(&rdev->nr_pending)==0) {
7156 if (mddev->pers->hot_remove_disk(
7157 mddev, rdev->raid_disk)==0) {
7159 sprintf(nm,"rd%d", rdev->raid_disk);
7160 sysfs_remove_link(&mddev->kobj, nm);
7161 rdev->raid_disk = -1;
7164 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7168 if (!mddev->external) {
7170 spin_lock_irq(&mddev->write_lock);
7171 if (mddev->safemode &&
7172 !atomic_read(&mddev->writes_pending) &&
7174 mddev->recovery_cp == MaxSector) {
7177 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
7179 if (mddev->safemode == 1)
7180 mddev->safemode = 0;
7181 spin_unlock_irq(&mddev->write_lock);
7183 sysfs_notify_dirent_safe(mddev->sysfs_state);
7187 md_update_sb(mddev, 0);
7189 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
7190 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
7191 /* resync/recovery still happening */
7192 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7195 if (mddev->sync_thread) {
7196 reap_sync_thread(mddev);
7199 /* Set RUNNING before clearing NEEDED to avoid
7200 * any transients in the value of "sync_action".
7202 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7203 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7204 /* Clear some bits that don't mean anything, but
7207 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
7208 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
7210 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
7212 /* no recovery is running.
7213 * remove any failed drives, then
7214 * add spares if possible.
7215 * Spare are also removed and re-added, to allow
7216 * the personality to fail the re-add.
7219 if (mddev->reshape_position != MaxSector) {
7220 if (mddev->pers->check_reshape == NULL ||
7221 mddev->pers->check_reshape(mddev) != 0)
7222 /* Cannot proceed */
7224 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
7225 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7226 } else if ((spares = remove_and_add_spares(mddev))) {
7227 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7228 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
7229 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
7230 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7231 } else if (mddev->recovery_cp < MaxSector) {
7232 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7233 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7234 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
7235 /* nothing to be done ... */
7238 if (mddev->pers->sync_request) {
7239 if (spares && mddev->bitmap && ! mddev->bitmap->file) {
7240 /* We are adding a device or devices to an array
7241 * which has the bitmap stored on all devices.
7242 * So make sure all bitmap pages get written
7244 bitmap_write_all(mddev->bitmap);
7246 mddev->sync_thread = md_register_thread(md_do_sync,
7249 if (!mddev->sync_thread) {
7250 printk(KERN_ERR "%s: could not start resync"
7253 /* leave the spares where they are, it shouldn't hurt */
7254 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7255 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7256 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
7257 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
7258 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
7260 md_wakeup_thread(mddev->sync_thread);
7261 sysfs_notify_dirent_safe(mddev->sysfs_action);
7262 md_new_event(mddev);
7265 if (!mddev->sync_thread) {
7266 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7267 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
7269 if (mddev->sysfs_action)
7270 sysfs_notify_dirent_safe(mddev->sysfs_action);
7272 mddev_unlock(mddev);
7276 void md_wait_for_blocked_rdev(mdk_rdev_t *rdev, mddev_t *mddev)
7278 sysfs_notify_dirent_safe(rdev->sysfs_state);
7279 wait_event_timeout(rdev->blocked_wait,
7280 !test_bit(Blocked, &rdev->flags),
7281 msecs_to_jiffies(5000));
7282 rdev_dec_pending(rdev, mddev);
7284 EXPORT_SYMBOL(md_wait_for_blocked_rdev);
7286 static int md_notify_reboot(struct notifier_block *this,
7287 unsigned long code, void *x)
7289 struct list_head *tmp;
7292 if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) {
7294 printk(KERN_INFO "md: stopping all md devices.\n");
7296 for_each_mddev(mddev, tmp)
7297 if (mddev_trylock(mddev)) {
7298 /* Force a switch to readonly even array
7299 * appears to still be in use. Hence
7302 md_set_readonly(mddev, 100);
7303 mddev_unlock(mddev);
7306 * certain more exotic SCSI devices are known to be
7307 * volatile wrt too early system reboots. While the
7308 * right place to handle this issue is the given
7309 * driver, we do want to have a safe RAID driver ...
7316 static struct notifier_block md_notifier = {
7317 .notifier_call = md_notify_reboot,
7319 .priority = INT_MAX, /* before any real devices */
7322 static void md_geninit(void)
7324 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
7326 proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops);
7329 static int __init md_init(void)
7333 md_wq = alloc_workqueue("md", WQ_RESCUER, 0);
7337 md_misc_wq = alloc_workqueue("md_misc", 0, 0);
7341 if ((ret = register_blkdev(MD_MAJOR, "md")) < 0)
7344 if ((ret = register_blkdev(0, "mdp")) < 0)
7348 blk_register_region(MKDEV(MD_MAJOR, 0), 1UL<<MINORBITS, THIS_MODULE,
7349 md_probe, NULL, NULL);
7350 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
7351 md_probe, NULL, NULL);
7353 register_reboot_notifier(&md_notifier);
7354 raid_table_header = register_sysctl_table(raid_root_table);
7360 unregister_blkdev(MD_MAJOR, "md");
7362 destroy_workqueue(md_misc_wq);
7364 destroy_workqueue(md_wq);
7372 * Searches all registered partitions for autorun RAID arrays
7376 static LIST_HEAD(all_detected_devices);
7377 struct detected_devices_node {
7378 struct list_head list;
7382 void md_autodetect_dev(dev_t dev)
7384 struct detected_devices_node *node_detected_dev;
7386 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
7387 if (node_detected_dev) {
7388 node_detected_dev->dev = dev;
7389 list_add_tail(&node_detected_dev->list, &all_detected_devices);
7391 printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed"
7392 ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev));
7397 static void autostart_arrays(int part)
7400 struct detected_devices_node *node_detected_dev;
7402 int i_scanned, i_passed;
7407 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
7409 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
7411 node_detected_dev = list_entry(all_detected_devices.next,
7412 struct detected_devices_node, list);
7413 list_del(&node_detected_dev->list);
7414 dev = node_detected_dev->dev;
7415 kfree(node_detected_dev);
7416 rdev = md_import_device(dev,0, 90);
7420 if (test_bit(Faulty, &rdev->flags)) {
7424 set_bit(AutoDetected, &rdev->flags);
7425 list_add(&rdev->same_set, &pending_raid_disks);
7429 printk(KERN_INFO "md: Scanned %d and added %d devices.\n",
7430 i_scanned, i_passed);
7432 autorun_devices(part);
7435 #endif /* !MODULE */
7437 static __exit void md_exit(void)
7440 struct list_head *tmp;
7442 blk_unregister_region(MKDEV(MD_MAJOR,0), 1U << MINORBITS);
7443 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
7445 unregister_blkdev(MD_MAJOR,"md");
7446 unregister_blkdev(mdp_major, "mdp");
7447 unregister_reboot_notifier(&md_notifier);
7448 unregister_sysctl_table(raid_table_header);
7449 remove_proc_entry("mdstat", NULL);
7450 for_each_mddev(mddev, tmp) {
7451 export_array(mddev);
7452 mddev->hold_active = 0;
7454 destroy_workqueue(md_misc_wq);
7455 destroy_workqueue(md_wq);
7458 subsys_initcall(md_init);
7459 module_exit(md_exit)
7461 static int get_ro(char *buffer, struct kernel_param *kp)
7463 return sprintf(buffer, "%d", start_readonly);
7465 static int set_ro(const char *val, struct kernel_param *kp)
7468 int num = simple_strtoul(val, &e, 10);
7469 if (*val && (*e == '\0' || *e == '\n')) {
7470 start_readonly = num;
7476 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
7477 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
7479 module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR);
7481 EXPORT_SYMBOL(register_md_personality);
7482 EXPORT_SYMBOL(unregister_md_personality);
7483 EXPORT_SYMBOL(md_error);
7484 EXPORT_SYMBOL(md_done_sync);
7485 EXPORT_SYMBOL(md_write_start);
7486 EXPORT_SYMBOL(md_write_end);
7487 EXPORT_SYMBOL(md_register_thread);
7488 EXPORT_SYMBOL(md_unregister_thread);
7489 EXPORT_SYMBOL(md_wakeup_thread);
7490 EXPORT_SYMBOL(md_check_recovery);
7491 MODULE_LICENSE("GPL");
7492 MODULE_DESCRIPTION("MD RAID framework");
7494 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);