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/buffer_head.h> /* for invalidate_bdev */
40 #include <linux/poll.h>
41 #include <linux/ctype.h>
42 #include <linux/string.h>
43 #include <linux/hdreg.h>
44 #include <linux/proc_fs.h>
45 #include <linux/random.h>
46 #include <linux/reboot.h>
47 #include <linux/file.h>
48 #include <linux/compat.h>
49 #include <linux/delay.h>
50 #include <linux/raid/md_p.h>
51 #include <linux/raid/md_u.h>
56 #define dprintk(x...) ((void)(DEBUG && printk(x)))
60 static void autostart_arrays(int part);
63 static LIST_HEAD(pers_list);
64 static DEFINE_SPINLOCK(pers_lock);
66 static void md_print_devices(void);
68 static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
70 #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
73 * Default number of read corrections we'll attempt on an rdev
74 * before ejecting it from the array. We divide the read error
75 * count by 2 for every hour elapsed between read errors.
77 #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
79 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
80 * is 1000 KB/sec, so the extra system load does not show up that much.
81 * Increase it if you want to have more _guaranteed_ speed. Note that
82 * the RAID driver will use the maximum available bandwidth if the IO
83 * subsystem is idle. There is also an 'absolute maximum' reconstruction
84 * speed limit - in case reconstruction slows down your system despite
87 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
88 * or /sys/block/mdX/md/sync_speed_{min,max}
91 static int sysctl_speed_limit_min = 1000;
92 static int sysctl_speed_limit_max = 200000;
93 static inline int speed_min(mddev_t *mddev)
95 return mddev->sync_speed_min ?
96 mddev->sync_speed_min : sysctl_speed_limit_min;
99 static inline int speed_max(mddev_t *mddev)
101 return mddev->sync_speed_max ?
102 mddev->sync_speed_max : sysctl_speed_limit_max;
105 static struct ctl_table_header *raid_table_header;
107 static ctl_table raid_table[] = {
109 .procname = "speed_limit_min",
110 .data = &sysctl_speed_limit_min,
111 .maxlen = sizeof(int),
112 .mode = S_IRUGO|S_IWUSR,
113 .proc_handler = proc_dointvec,
116 .procname = "speed_limit_max",
117 .data = &sysctl_speed_limit_max,
118 .maxlen = sizeof(int),
119 .mode = S_IRUGO|S_IWUSR,
120 .proc_handler = proc_dointvec,
125 static ctl_table raid_dir_table[] = {
129 .mode = S_IRUGO|S_IXUGO,
135 static ctl_table raid_root_table[] = {
140 .child = raid_dir_table,
145 static const struct block_device_operations md_fops;
147 static int start_readonly;
150 * We have a system wide 'event count' that is incremented
151 * on any 'interesting' event, and readers of /proc/mdstat
152 * can use 'poll' or 'select' to find out when the event
156 * start array, stop array, error, add device, remove device,
157 * start build, activate spare
159 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
160 static atomic_t md_event_count;
161 void md_new_event(mddev_t *mddev)
163 atomic_inc(&md_event_count);
164 wake_up(&md_event_waiters);
166 EXPORT_SYMBOL_GPL(md_new_event);
168 /* Alternate version that can be called from interrupts
169 * when calling sysfs_notify isn't needed.
171 static void md_new_event_inintr(mddev_t *mddev)
173 atomic_inc(&md_event_count);
174 wake_up(&md_event_waiters);
178 * Enables to iterate over all existing md arrays
179 * all_mddevs_lock protects this list.
181 static LIST_HEAD(all_mddevs);
182 static DEFINE_SPINLOCK(all_mddevs_lock);
186 * iterates through all used mddevs in the system.
187 * We take care to grab the all_mddevs_lock whenever navigating
188 * the list, and to always hold a refcount when unlocked.
189 * Any code which breaks out of this loop while own
190 * a reference to the current mddev and must mddev_put it.
192 #define for_each_mddev(mddev,tmp) \
194 for (({ spin_lock(&all_mddevs_lock); \
195 tmp = all_mddevs.next; \
197 ({ if (tmp != &all_mddevs) \
198 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
199 spin_unlock(&all_mddevs_lock); \
200 if (mddev) mddev_put(mddev); \
201 mddev = list_entry(tmp, mddev_t, all_mddevs); \
202 tmp != &all_mddevs;}); \
203 ({ spin_lock(&all_mddevs_lock); \
208 /* Rather than calling directly into the personality make_request function,
209 * IO requests come here first so that we can check if the device is
210 * being suspended pending a reconfiguration.
211 * We hold a refcount over the call to ->make_request. By the time that
212 * call has finished, the bio has been linked into some internal structure
213 * and so is visible to ->quiesce(), so we don't need the refcount any more.
215 static int md_make_request(struct request_queue *q, struct bio *bio)
217 mddev_t *mddev = q->queuedata;
219 if (mddev == NULL || mddev->pers == NULL) {
224 if (mddev->suspended || mddev->barrier) {
227 prepare_to_wait(&mddev->sb_wait, &__wait,
228 TASK_UNINTERRUPTIBLE);
229 if (!mddev->suspended && !mddev->barrier)
235 finish_wait(&mddev->sb_wait, &__wait);
237 atomic_inc(&mddev->active_io);
239 rv = mddev->pers->make_request(q, bio);
240 if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended)
241 wake_up(&mddev->sb_wait);
246 static void mddev_suspend(mddev_t *mddev)
248 BUG_ON(mddev->suspended);
249 mddev->suspended = 1;
251 wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0);
252 mddev->pers->quiesce(mddev, 1);
253 md_unregister_thread(mddev->thread);
254 mddev->thread = NULL;
255 /* we now know that no code is executing in the personality module,
256 * except possibly the tail end of a ->bi_end_io function, but that
257 * is certain to complete before the module has a chance to get
262 static void mddev_resume(mddev_t *mddev)
264 mddev->suspended = 0;
265 wake_up(&mddev->sb_wait);
266 mddev->pers->quiesce(mddev, 0);
269 int mddev_congested(mddev_t *mddev, int bits)
273 return mddev->suspended;
275 EXPORT_SYMBOL(mddev_congested);
278 * Generic barrier handling for md
281 #define POST_REQUEST_BARRIER ((void*)1)
283 static void md_end_barrier(struct bio *bio, int err)
285 mdk_rdev_t *rdev = bio->bi_private;
286 mddev_t *mddev = rdev->mddev;
287 if (err == -EOPNOTSUPP && mddev->barrier != POST_REQUEST_BARRIER)
288 set_bit(BIO_EOPNOTSUPP, &mddev->barrier->bi_flags);
290 rdev_dec_pending(rdev, mddev);
292 if (atomic_dec_and_test(&mddev->flush_pending)) {
293 if (mddev->barrier == POST_REQUEST_BARRIER) {
294 /* This was a post-request barrier */
295 mddev->barrier = NULL;
296 wake_up(&mddev->sb_wait);
298 /* The pre-request barrier has finished */
299 schedule_work(&mddev->barrier_work);
304 static void submit_barriers(mddev_t *mddev)
309 list_for_each_entry_rcu(rdev, &mddev->disks, same_set)
310 if (rdev->raid_disk >= 0 &&
311 !test_bit(Faulty, &rdev->flags)) {
312 /* Take two references, one is dropped
313 * when request finishes, one after
314 * we reclaim rcu_read_lock
317 atomic_inc(&rdev->nr_pending);
318 atomic_inc(&rdev->nr_pending);
320 bi = bio_alloc(GFP_KERNEL, 0);
321 bi->bi_end_io = md_end_barrier;
322 bi->bi_private = rdev;
323 bi->bi_bdev = rdev->bdev;
324 atomic_inc(&mddev->flush_pending);
325 submit_bio(WRITE_BARRIER, bi);
327 rdev_dec_pending(rdev, mddev);
332 static void md_submit_barrier(struct work_struct *ws)
334 mddev_t *mddev = container_of(ws, mddev_t, barrier_work);
335 struct bio *bio = mddev->barrier;
337 atomic_set(&mddev->flush_pending, 1);
339 if (test_bit(BIO_EOPNOTSUPP, &bio->bi_flags))
340 bio_endio(bio, -EOPNOTSUPP);
341 else if (bio->bi_size == 0)
342 /* an empty barrier - all done */
345 bio->bi_rw &= ~(1<<BIO_RW_BARRIER);
346 if (mddev->pers->make_request(mddev->queue, bio))
347 generic_make_request(bio);
348 mddev->barrier = POST_REQUEST_BARRIER;
349 submit_barriers(mddev);
351 if (atomic_dec_and_test(&mddev->flush_pending)) {
352 mddev->barrier = NULL;
353 wake_up(&mddev->sb_wait);
357 void md_barrier_request(mddev_t *mddev, struct bio *bio)
359 spin_lock_irq(&mddev->write_lock);
360 wait_event_lock_irq(mddev->sb_wait,
362 mddev->write_lock, /*nothing*/);
363 mddev->barrier = bio;
364 spin_unlock_irq(&mddev->write_lock);
366 atomic_set(&mddev->flush_pending, 1);
367 INIT_WORK(&mddev->barrier_work, md_submit_barrier);
369 submit_barriers(mddev);
371 if (atomic_dec_and_test(&mddev->flush_pending))
372 schedule_work(&mddev->barrier_work);
374 EXPORT_SYMBOL(md_barrier_request);
376 static inline mddev_t *mddev_get(mddev_t *mddev)
378 atomic_inc(&mddev->active);
382 static void mddev_delayed_delete(struct work_struct *ws);
384 static void mddev_put(mddev_t *mddev)
386 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
388 if (!mddev->raid_disks && list_empty(&mddev->disks) &&
389 mddev->ctime == 0 && !mddev->hold_active) {
390 /* Array is not configured at all, and not held active,
392 list_del(&mddev->all_mddevs);
393 if (mddev->gendisk) {
394 /* we did a probe so need to clean up.
395 * Call schedule_work inside the spinlock
396 * so that flush_scheduled_work() after
397 * mddev_find will succeed in waiting for the
400 INIT_WORK(&mddev->del_work, mddev_delayed_delete);
401 schedule_work(&mddev->del_work);
405 spin_unlock(&all_mddevs_lock);
408 static mddev_t * mddev_find(dev_t unit)
410 mddev_t *mddev, *new = NULL;
413 spin_lock(&all_mddevs_lock);
416 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
417 if (mddev->unit == unit) {
419 spin_unlock(&all_mddevs_lock);
425 list_add(&new->all_mddevs, &all_mddevs);
426 spin_unlock(&all_mddevs_lock);
427 new->hold_active = UNTIL_IOCTL;
431 /* find an unused unit number */
432 static int next_minor = 512;
433 int start = next_minor;
437 dev = MKDEV(MD_MAJOR, next_minor);
439 if (next_minor > MINORMASK)
441 if (next_minor == start) {
442 /* Oh dear, all in use. */
443 spin_unlock(&all_mddevs_lock);
449 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
450 if (mddev->unit == dev) {
456 new->md_minor = MINOR(dev);
457 new->hold_active = UNTIL_STOP;
458 list_add(&new->all_mddevs, &all_mddevs);
459 spin_unlock(&all_mddevs_lock);
462 spin_unlock(&all_mddevs_lock);
464 new = kzalloc(sizeof(*new), GFP_KERNEL);
469 if (MAJOR(unit) == MD_MAJOR)
470 new->md_minor = MINOR(unit);
472 new->md_minor = MINOR(unit) >> MdpMinorShift;
474 mutex_init(&new->open_mutex);
475 mutex_init(&new->reconfig_mutex);
476 mutex_init(&new->bitmap_info.mutex);
477 INIT_LIST_HEAD(&new->disks);
478 INIT_LIST_HEAD(&new->all_mddevs);
479 init_timer(&new->safemode_timer);
480 atomic_set(&new->active, 1);
481 atomic_set(&new->openers, 0);
482 atomic_set(&new->active_io, 0);
483 spin_lock_init(&new->write_lock);
484 atomic_set(&new->flush_pending, 0);
485 init_waitqueue_head(&new->sb_wait);
486 init_waitqueue_head(&new->recovery_wait);
487 new->reshape_position = MaxSector;
489 new->resync_max = MaxSector;
490 new->level = LEVEL_NONE;
495 static inline int mddev_lock(mddev_t * mddev)
497 return mutex_lock_interruptible(&mddev->reconfig_mutex);
500 static inline int mddev_is_locked(mddev_t *mddev)
502 return mutex_is_locked(&mddev->reconfig_mutex);
505 static inline int mddev_trylock(mddev_t * mddev)
507 return mutex_trylock(&mddev->reconfig_mutex);
510 static struct attribute_group md_redundancy_group;
512 static inline void mddev_unlock(mddev_t * mddev)
514 if (mddev->pers == NULL && mddev->private) {
515 /* These cannot be removed under reconfig_mutex as
516 * an access to the files will try to take reconfig_mutex
517 * while holding the file unremovable, which leads to
519 * So hold open_mutex instead - we are allowed to take
520 * it while holding reconfig_mutex, and md_run can
521 * use it to wait for the remove to complete.
523 mutex_lock(&mddev->open_mutex);
524 mutex_unlock(&mddev->reconfig_mutex);
526 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
527 if (mddev->private != (void*)1)
528 sysfs_remove_group(&mddev->kobj, mddev->private);
529 if (mddev->sysfs_action)
530 sysfs_put(mddev->sysfs_action);
531 mddev->sysfs_action = NULL;
532 mddev->private = NULL;
533 mutex_unlock(&mddev->open_mutex);
535 mutex_unlock(&mddev->reconfig_mutex);
537 md_wakeup_thread(mddev->thread);
540 static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr)
544 list_for_each_entry(rdev, &mddev->disks, same_set)
545 if (rdev->desc_nr == nr)
551 static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev)
555 list_for_each_entry(rdev, &mddev->disks, same_set)
556 if (rdev->bdev->bd_dev == dev)
562 static struct mdk_personality *find_pers(int level, char *clevel)
564 struct mdk_personality *pers;
565 list_for_each_entry(pers, &pers_list, list) {
566 if (level != LEVEL_NONE && pers->level == level)
568 if (strcmp(pers->name, clevel)==0)
574 /* return the offset of the super block in 512byte sectors */
575 static inline sector_t calc_dev_sboffset(struct block_device *bdev)
577 sector_t num_sectors = bdev->bd_inode->i_size / 512;
578 return MD_NEW_SIZE_SECTORS(num_sectors);
581 static int alloc_disk_sb(mdk_rdev_t * rdev)
586 rdev->sb_page = alloc_page(GFP_KERNEL);
587 if (!rdev->sb_page) {
588 printk(KERN_ALERT "md: out of memory.\n");
595 static void free_disk_sb(mdk_rdev_t * rdev)
598 put_page(rdev->sb_page);
600 rdev->sb_page = NULL;
607 static void super_written(struct bio *bio, int error)
609 mdk_rdev_t *rdev = bio->bi_private;
610 mddev_t *mddev = rdev->mddev;
612 if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) {
613 printk("md: super_written gets error=%d, uptodate=%d\n",
614 error, test_bit(BIO_UPTODATE, &bio->bi_flags));
615 WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags));
616 md_error(mddev, rdev);
619 if (atomic_dec_and_test(&mddev->pending_writes))
620 wake_up(&mddev->sb_wait);
624 static void super_written_barrier(struct bio *bio, int error)
626 struct bio *bio2 = bio->bi_private;
627 mdk_rdev_t *rdev = bio2->bi_private;
628 mddev_t *mddev = rdev->mddev;
630 if (!test_bit(BIO_UPTODATE, &bio->bi_flags) &&
631 error == -EOPNOTSUPP) {
633 /* barriers don't appear to be supported :-( */
634 set_bit(BarriersNotsupp, &rdev->flags);
635 mddev->barriers_work = 0;
636 spin_lock_irqsave(&mddev->write_lock, flags);
637 bio2->bi_next = mddev->biolist;
638 mddev->biolist = bio2;
639 spin_unlock_irqrestore(&mddev->write_lock, flags);
640 wake_up(&mddev->sb_wait);
644 bio->bi_private = rdev;
645 super_written(bio, error);
649 void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
650 sector_t sector, int size, struct page *page)
652 /* write first size bytes of page to sector of rdev
653 * Increment mddev->pending_writes before returning
654 * and decrement it on completion, waking up sb_wait
655 * if zero is reached.
656 * If an error occurred, call md_error
658 * As we might need to resubmit the request if BIO_RW_BARRIER
659 * causes ENOTSUPP, we allocate a spare bio...
661 struct bio *bio = bio_alloc(GFP_NOIO, 1);
662 int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNCIO) | (1<<BIO_RW_UNPLUG);
664 bio->bi_bdev = rdev->bdev;
665 bio->bi_sector = sector;
666 bio_add_page(bio, page, size, 0);
667 bio->bi_private = rdev;
668 bio->bi_end_io = super_written;
671 atomic_inc(&mddev->pending_writes);
672 if (!test_bit(BarriersNotsupp, &rdev->flags)) {
674 rw |= (1<<BIO_RW_BARRIER);
675 rbio = bio_clone(bio, GFP_NOIO);
676 rbio->bi_private = bio;
677 rbio->bi_end_io = super_written_barrier;
678 submit_bio(rw, rbio);
683 void md_super_wait(mddev_t *mddev)
685 /* wait for all superblock writes that were scheduled to complete.
686 * if any had to be retried (due to BARRIER problems), retry them
690 prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE);
691 if (atomic_read(&mddev->pending_writes)==0)
693 while (mddev->biolist) {
695 spin_lock_irq(&mddev->write_lock);
696 bio = mddev->biolist;
697 mddev->biolist = bio->bi_next ;
699 spin_unlock_irq(&mddev->write_lock);
700 submit_bio(bio->bi_rw, bio);
704 finish_wait(&mddev->sb_wait, &wq);
707 static void bi_complete(struct bio *bio, int error)
709 complete((struct completion*)bio->bi_private);
712 int sync_page_io(struct block_device *bdev, sector_t sector, int size,
713 struct page *page, int rw)
715 struct bio *bio = bio_alloc(GFP_NOIO, 1);
716 struct completion event;
719 rw |= (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_UNPLUG);
722 bio->bi_sector = sector;
723 bio_add_page(bio, page, size, 0);
724 init_completion(&event);
725 bio->bi_private = &event;
726 bio->bi_end_io = bi_complete;
728 wait_for_completion(&event);
730 ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
734 EXPORT_SYMBOL_GPL(sync_page_io);
736 static int read_disk_sb(mdk_rdev_t * rdev, int size)
738 char b[BDEVNAME_SIZE];
739 if (!rdev->sb_page) {
747 if (!sync_page_io(rdev->bdev, rdev->sb_start, size, rdev->sb_page, READ))
753 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
754 bdevname(rdev->bdev,b));
758 static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
760 return sb1->set_uuid0 == sb2->set_uuid0 &&
761 sb1->set_uuid1 == sb2->set_uuid1 &&
762 sb1->set_uuid2 == sb2->set_uuid2 &&
763 sb1->set_uuid3 == sb2->set_uuid3;
766 static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
769 mdp_super_t *tmp1, *tmp2;
771 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
772 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
774 if (!tmp1 || !tmp2) {
776 printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n");
784 * nr_disks is not constant
789 ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0);
797 static u32 md_csum_fold(u32 csum)
799 csum = (csum & 0xffff) + (csum >> 16);
800 return (csum & 0xffff) + (csum >> 16);
803 static unsigned int calc_sb_csum(mdp_super_t * sb)
806 u32 *sb32 = (u32*)sb;
808 unsigned int disk_csum, csum;
810 disk_csum = sb->sb_csum;
813 for (i = 0; i < MD_SB_BYTES/4 ; i++)
815 csum = (newcsum & 0xffffffff) + (newcsum>>32);
819 /* This used to use csum_partial, which was wrong for several
820 * reasons including that different results are returned on
821 * different architectures. It isn't critical that we get exactly
822 * the same return value as before (we always csum_fold before
823 * testing, and that removes any differences). However as we
824 * know that csum_partial always returned a 16bit value on
825 * alphas, do a fold to maximise conformity to previous behaviour.
827 sb->sb_csum = md_csum_fold(disk_csum);
829 sb->sb_csum = disk_csum;
836 * Handle superblock details.
837 * We want to be able to handle multiple superblock formats
838 * so we have a common interface to them all, and an array of
839 * different handlers.
840 * We rely on user-space to write the initial superblock, and support
841 * reading and updating of superblocks.
842 * Interface methods are:
843 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
844 * loads and validates a superblock on dev.
845 * if refdev != NULL, compare superblocks on both devices
847 * 0 - dev has a superblock that is compatible with refdev
848 * 1 - dev has a superblock that is compatible and newer than refdev
849 * so dev should be used as the refdev in future
850 * -EINVAL superblock incompatible or invalid
851 * -othererror e.g. -EIO
853 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
854 * Verify that dev is acceptable into mddev.
855 * The first time, mddev->raid_disks will be 0, and data from
856 * dev should be merged in. Subsequent calls check that dev
857 * is new enough. Return 0 or -EINVAL
859 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
860 * Update the superblock for rdev with data in mddev
861 * This does not write to disc.
867 struct module *owner;
868 int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev,
870 int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev);
871 void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev);
872 unsigned long long (*rdev_size_change)(mdk_rdev_t *rdev,
873 sector_t num_sectors);
877 * Check that the given mddev has no bitmap.
879 * This function is called from the run method of all personalities that do not
880 * support bitmaps. It prints an error message and returns non-zero if mddev
881 * has a bitmap. Otherwise, it returns 0.
884 int md_check_no_bitmap(mddev_t *mddev)
886 if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset)
888 printk(KERN_ERR "%s: bitmaps are not supported for %s\n",
889 mdname(mddev), mddev->pers->name);
892 EXPORT_SYMBOL(md_check_no_bitmap);
895 * load_super for 0.90.0
897 static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
899 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
904 * Calculate the position of the superblock (512byte sectors),
905 * it's at the end of the disk.
907 * It also happens to be a multiple of 4Kb.
909 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
911 ret = read_disk_sb(rdev, MD_SB_BYTES);
916 bdevname(rdev->bdev, b);
917 sb = (mdp_super_t*)page_address(rdev->sb_page);
919 if (sb->md_magic != MD_SB_MAGIC) {
920 printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
925 if (sb->major_version != 0 ||
926 sb->minor_version < 90 ||
927 sb->minor_version > 91) {
928 printk(KERN_WARNING "Bad version number %d.%d on %s\n",
929 sb->major_version, sb->minor_version,
934 if (sb->raid_disks <= 0)
937 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
938 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
943 rdev->preferred_minor = sb->md_minor;
944 rdev->data_offset = 0;
945 rdev->sb_size = MD_SB_BYTES;
947 if (sb->level == LEVEL_MULTIPATH)
950 rdev->desc_nr = sb->this_disk.number;
956 mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page);
957 if (!uuid_equal(refsb, sb)) {
958 printk(KERN_WARNING "md: %s has different UUID to %s\n",
959 b, bdevname(refdev->bdev,b2));
962 if (!sb_equal(refsb, sb)) {
963 printk(KERN_WARNING "md: %s has same UUID"
964 " but different superblock to %s\n",
965 b, bdevname(refdev->bdev, b2));
969 ev2 = md_event(refsb);
975 rdev->sectors = rdev->sb_start;
977 if (rdev->sectors < sb->size * 2 && sb->level > 1)
978 /* "this cannot possibly happen" ... */
986 * validate_super for 0.90.0
988 static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
991 mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page);
992 __u64 ev1 = md_event(sb);
994 rdev->raid_disk = -1;
995 clear_bit(Faulty, &rdev->flags);
996 clear_bit(In_sync, &rdev->flags);
997 clear_bit(WriteMostly, &rdev->flags);
998 clear_bit(BarriersNotsupp, &rdev->flags);
1000 if (mddev->raid_disks == 0) {
1001 mddev->major_version = 0;
1002 mddev->minor_version = sb->minor_version;
1003 mddev->patch_version = sb->patch_version;
1004 mddev->external = 0;
1005 mddev->chunk_sectors = sb->chunk_size >> 9;
1006 mddev->ctime = sb->ctime;
1007 mddev->utime = sb->utime;
1008 mddev->level = sb->level;
1009 mddev->clevel[0] = 0;
1010 mddev->layout = sb->layout;
1011 mddev->raid_disks = sb->raid_disks;
1012 mddev->dev_sectors = sb->size * 2;
1013 mddev->events = ev1;
1014 mddev->bitmap_info.offset = 0;
1015 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
1017 if (mddev->minor_version >= 91) {
1018 mddev->reshape_position = sb->reshape_position;
1019 mddev->delta_disks = sb->delta_disks;
1020 mddev->new_level = sb->new_level;
1021 mddev->new_layout = sb->new_layout;
1022 mddev->new_chunk_sectors = sb->new_chunk >> 9;
1024 mddev->reshape_position = MaxSector;
1025 mddev->delta_disks = 0;
1026 mddev->new_level = mddev->level;
1027 mddev->new_layout = mddev->layout;
1028 mddev->new_chunk_sectors = mddev->chunk_sectors;
1031 if (sb->state & (1<<MD_SB_CLEAN))
1032 mddev->recovery_cp = MaxSector;
1034 if (sb->events_hi == sb->cp_events_hi &&
1035 sb->events_lo == sb->cp_events_lo) {
1036 mddev->recovery_cp = sb->recovery_cp;
1038 mddev->recovery_cp = 0;
1041 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
1042 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
1043 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
1044 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
1046 mddev->max_disks = MD_SB_DISKS;
1048 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
1049 mddev->bitmap_info.file == NULL)
1050 mddev->bitmap_info.offset =
1051 mddev->bitmap_info.default_offset;
1053 } else if (mddev->pers == NULL) {
1054 /* Insist on good event counter while assembling */
1056 if (ev1 < mddev->events)
1058 } else if (mddev->bitmap) {
1059 /* if adding to array with a bitmap, then we can accept an
1060 * older device ... but not too old.
1062 if (ev1 < mddev->bitmap->events_cleared)
1065 if (ev1 < mddev->events)
1066 /* just a hot-add of a new device, leave raid_disk at -1 */
1070 if (mddev->level != LEVEL_MULTIPATH) {
1071 desc = sb->disks + rdev->desc_nr;
1073 if (desc->state & (1<<MD_DISK_FAULTY))
1074 set_bit(Faulty, &rdev->flags);
1075 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
1076 desc->raid_disk < mddev->raid_disks */) {
1077 set_bit(In_sync, &rdev->flags);
1078 rdev->raid_disk = desc->raid_disk;
1079 } else if (desc->state & (1<<MD_DISK_ACTIVE)) {
1080 /* active but not in sync implies recovery up to
1081 * reshape position. We don't know exactly where
1082 * that is, so set to zero for now */
1083 if (mddev->minor_version >= 91) {
1084 rdev->recovery_offset = 0;
1085 rdev->raid_disk = desc->raid_disk;
1088 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
1089 set_bit(WriteMostly, &rdev->flags);
1090 } else /* MULTIPATH are always insync */
1091 set_bit(In_sync, &rdev->flags);
1096 * sync_super for 0.90.0
1098 static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1102 int next_spare = mddev->raid_disks;
1105 /* make rdev->sb match mddev data..
1108 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1109 * 3/ any empty disks < next_spare become removed
1111 * disks[0] gets initialised to REMOVED because
1112 * we cannot be sure from other fields if it has
1113 * been initialised or not.
1116 int active=0, working=0,failed=0,spare=0,nr_disks=0;
1118 rdev->sb_size = MD_SB_BYTES;
1120 sb = (mdp_super_t*)page_address(rdev->sb_page);
1122 memset(sb, 0, sizeof(*sb));
1124 sb->md_magic = MD_SB_MAGIC;
1125 sb->major_version = mddev->major_version;
1126 sb->patch_version = mddev->patch_version;
1127 sb->gvalid_words = 0; /* ignored */
1128 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
1129 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
1130 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
1131 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
1133 sb->ctime = mddev->ctime;
1134 sb->level = mddev->level;
1135 sb->size = mddev->dev_sectors / 2;
1136 sb->raid_disks = mddev->raid_disks;
1137 sb->md_minor = mddev->md_minor;
1138 sb->not_persistent = 0;
1139 sb->utime = mddev->utime;
1141 sb->events_hi = (mddev->events>>32);
1142 sb->events_lo = (u32)mddev->events;
1144 if (mddev->reshape_position == MaxSector)
1145 sb->minor_version = 90;
1147 sb->minor_version = 91;
1148 sb->reshape_position = mddev->reshape_position;
1149 sb->new_level = mddev->new_level;
1150 sb->delta_disks = mddev->delta_disks;
1151 sb->new_layout = mddev->new_layout;
1152 sb->new_chunk = mddev->new_chunk_sectors << 9;
1154 mddev->minor_version = sb->minor_version;
1157 sb->recovery_cp = mddev->recovery_cp;
1158 sb->cp_events_hi = (mddev->events>>32);
1159 sb->cp_events_lo = (u32)mddev->events;
1160 if (mddev->recovery_cp == MaxSector)
1161 sb->state = (1<< MD_SB_CLEAN);
1163 sb->recovery_cp = 0;
1165 sb->layout = mddev->layout;
1166 sb->chunk_size = mddev->chunk_sectors << 9;
1168 if (mddev->bitmap && mddev->bitmap_info.file == NULL)
1169 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
1171 sb->disks[0].state = (1<<MD_DISK_REMOVED);
1172 list_for_each_entry(rdev2, &mddev->disks, same_set) {
1175 int is_active = test_bit(In_sync, &rdev2->flags);
1177 if (rdev2->raid_disk >= 0 &&
1178 sb->minor_version >= 91)
1179 /* we have nowhere to store the recovery_offset,
1180 * but if it is not below the reshape_position,
1181 * we can piggy-back on that.
1184 if (rdev2->raid_disk < 0 ||
1185 test_bit(Faulty, &rdev2->flags))
1188 desc_nr = rdev2->raid_disk;
1190 desc_nr = next_spare++;
1191 rdev2->desc_nr = desc_nr;
1192 d = &sb->disks[rdev2->desc_nr];
1194 d->number = rdev2->desc_nr;
1195 d->major = MAJOR(rdev2->bdev->bd_dev);
1196 d->minor = MINOR(rdev2->bdev->bd_dev);
1198 d->raid_disk = rdev2->raid_disk;
1200 d->raid_disk = rdev2->desc_nr; /* compatibility */
1201 if (test_bit(Faulty, &rdev2->flags))
1202 d->state = (1<<MD_DISK_FAULTY);
1203 else if (is_active) {
1204 d->state = (1<<MD_DISK_ACTIVE);
1205 if (test_bit(In_sync, &rdev2->flags))
1206 d->state |= (1<<MD_DISK_SYNC);
1214 if (test_bit(WriteMostly, &rdev2->flags))
1215 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1217 /* now set the "removed" and "faulty" bits on any missing devices */
1218 for (i=0 ; i < mddev->raid_disks ; i++) {
1219 mdp_disk_t *d = &sb->disks[i];
1220 if (d->state == 0 && d->number == 0) {
1223 d->state = (1<<MD_DISK_REMOVED);
1224 d->state |= (1<<MD_DISK_FAULTY);
1228 sb->nr_disks = nr_disks;
1229 sb->active_disks = active;
1230 sb->working_disks = working;
1231 sb->failed_disks = failed;
1232 sb->spare_disks = spare;
1234 sb->this_disk = sb->disks[rdev->desc_nr];
1235 sb->sb_csum = calc_sb_csum(sb);
1239 * rdev_size_change for 0.90.0
1241 static unsigned long long
1242 super_90_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors)
1244 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1245 return 0; /* component must fit device */
1246 if (rdev->mddev->bitmap_info.offset)
1247 return 0; /* can't move bitmap */
1248 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
1249 if (!num_sectors || num_sectors > rdev->sb_start)
1250 num_sectors = rdev->sb_start;
1251 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1253 md_super_wait(rdev->mddev);
1254 return num_sectors / 2; /* kB for sysfs */
1259 * version 1 superblock
1262 static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb)
1266 unsigned long long newcsum;
1267 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1268 __le32 *isuper = (__le32*)sb;
1271 disk_csum = sb->sb_csum;
1274 for (i=0; size>=4; size -= 4 )
1275 newcsum += le32_to_cpu(*isuper++);
1278 newcsum += le16_to_cpu(*(__le16*) isuper);
1280 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1281 sb->sb_csum = disk_csum;
1282 return cpu_to_le32(csum);
1285 static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
1287 struct mdp_superblock_1 *sb;
1290 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1294 * Calculate the position of the superblock in 512byte sectors.
1295 * It is always aligned to a 4K boundary and
1296 * depeding on minor_version, it can be:
1297 * 0: At least 8K, but less than 12K, from end of device
1298 * 1: At start of device
1299 * 2: 4K from start of device.
1301 switch(minor_version) {
1303 sb_start = rdev->bdev->bd_inode->i_size >> 9;
1305 sb_start &= ~(sector_t)(4*2-1);
1316 rdev->sb_start = sb_start;
1318 /* superblock is rarely larger than 1K, but it can be larger,
1319 * and it is safe to read 4k, so we do that
1321 ret = read_disk_sb(rdev, 4096);
1322 if (ret) return ret;
1325 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1327 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1328 sb->major_version != cpu_to_le32(1) ||
1329 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1330 le64_to_cpu(sb->super_offset) != rdev->sb_start ||
1331 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1334 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1335 printk("md: invalid superblock checksum on %s\n",
1336 bdevname(rdev->bdev,b));
1339 if (le64_to_cpu(sb->data_size) < 10) {
1340 printk("md: data_size too small on %s\n",
1341 bdevname(rdev->bdev,b));
1345 rdev->preferred_minor = 0xffff;
1346 rdev->data_offset = le64_to_cpu(sb->data_offset);
1347 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1349 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1350 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1351 if (rdev->sb_size & bmask)
1352 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1355 && rdev->data_offset < sb_start + (rdev->sb_size/512))
1358 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1361 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1367 struct mdp_superblock_1 *refsb =
1368 (struct mdp_superblock_1*)page_address(refdev->sb_page);
1370 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1371 sb->level != refsb->level ||
1372 sb->layout != refsb->layout ||
1373 sb->chunksize != refsb->chunksize) {
1374 printk(KERN_WARNING "md: %s has strangely different"
1375 " superblock to %s\n",
1376 bdevname(rdev->bdev,b),
1377 bdevname(refdev->bdev,b2));
1380 ev1 = le64_to_cpu(sb->events);
1381 ev2 = le64_to_cpu(refsb->events);
1389 rdev->sectors = (rdev->bdev->bd_inode->i_size >> 9) -
1390 le64_to_cpu(sb->data_offset);
1392 rdev->sectors = rdev->sb_start;
1393 if (rdev->sectors < le64_to_cpu(sb->data_size))
1395 rdev->sectors = le64_to_cpu(sb->data_size);
1396 if (le64_to_cpu(sb->size) > rdev->sectors)
1401 static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
1403 struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1404 __u64 ev1 = le64_to_cpu(sb->events);
1406 rdev->raid_disk = -1;
1407 clear_bit(Faulty, &rdev->flags);
1408 clear_bit(In_sync, &rdev->flags);
1409 clear_bit(WriteMostly, &rdev->flags);
1410 clear_bit(BarriersNotsupp, &rdev->flags);
1412 if (mddev->raid_disks == 0) {
1413 mddev->major_version = 1;
1414 mddev->patch_version = 0;
1415 mddev->external = 0;
1416 mddev->chunk_sectors = le32_to_cpu(sb->chunksize);
1417 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1418 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1419 mddev->level = le32_to_cpu(sb->level);
1420 mddev->clevel[0] = 0;
1421 mddev->layout = le32_to_cpu(sb->layout);
1422 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1423 mddev->dev_sectors = le64_to_cpu(sb->size);
1424 mddev->events = ev1;
1425 mddev->bitmap_info.offset = 0;
1426 mddev->bitmap_info.default_offset = 1024 >> 9;
1428 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1429 memcpy(mddev->uuid, sb->set_uuid, 16);
1431 mddev->max_disks = (4096-256)/2;
1433 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1434 mddev->bitmap_info.file == NULL )
1435 mddev->bitmap_info.offset =
1436 (__s32)le32_to_cpu(sb->bitmap_offset);
1438 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1439 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1440 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1441 mddev->new_level = le32_to_cpu(sb->new_level);
1442 mddev->new_layout = le32_to_cpu(sb->new_layout);
1443 mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk);
1445 mddev->reshape_position = MaxSector;
1446 mddev->delta_disks = 0;
1447 mddev->new_level = mddev->level;
1448 mddev->new_layout = mddev->layout;
1449 mddev->new_chunk_sectors = mddev->chunk_sectors;
1452 } else if (mddev->pers == NULL) {
1453 /* Insist of good event counter while assembling */
1455 if (ev1 < mddev->events)
1457 } else if (mddev->bitmap) {
1458 /* If adding to array with a bitmap, then we can accept an
1459 * older device, but not too old.
1461 if (ev1 < mddev->bitmap->events_cleared)
1464 if (ev1 < mddev->events)
1465 /* just a hot-add of a new device, leave raid_disk at -1 */
1468 if (mddev->level != LEVEL_MULTIPATH) {
1470 if (rdev->desc_nr < 0 ||
1471 rdev->desc_nr >= le32_to_cpu(sb->max_dev)) {
1475 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1477 case 0xffff: /* spare */
1479 case 0xfffe: /* faulty */
1480 set_bit(Faulty, &rdev->flags);
1483 if ((le32_to_cpu(sb->feature_map) &
1484 MD_FEATURE_RECOVERY_OFFSET))
1485 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1487 set_bit(In_sync, &rdev->flags);
1488 rdev->raid_disk = role;
1491 if (sb->devflags & WriteMostly1)
1492 set_bit(WriteMostly, &rdev->flags);
1493 } else /* MULTIPATH are always insync */
1494 set_bit(In_sync, &rdev->flags);
1499 static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1501 struct mdp_superblock_1 *sb;
1504 /* make rdev->sb match mddev and rdev data. */
1506 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1508 sb->feature_map = 0;
1510 sb->recovery_offset = cpu_to_le64(0);
1511 memset(sb->pad1, 0, sizeof(sb->pad1));
1512 memset(sb->pad2, 0, sizeof(sb->pad2));
1513 memset(sb->pad3, 0, sizeof(sb->pad3));
1515 sb->utime = cpu_to_le64((__u64)mddev->utime);
1516 sb->events = cpu_to_le64(mddev->events);
1518 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1520 sb->resync_offset = cpu_to_le64(0);
1522 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
1524 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
1525 sb->size = cpu_to_le64(mddev->dev_sectors);
1526 sb->chunksize = cpu_to_le32(mddev->chunk_sectors);
1527 sb->level = cpu_to_le32(mddev->level);
1528 sb->layout = cpu_to_le32(mddev->layout);
1530 if (mddev->bitmap && mddev->bitmap_info.file == NULL) {
1531 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset);
1532 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
1535 if (rdev->raid_disk >= 0 &&
1536 !test_bit(In_sync, &rdev->flags)) {
1538 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1539 sb->recovery_offset =
1540 cpu_to_le64(rdev->recovery_offset);
1543 if (mddev->reshape_position != MaxSector) {
1544 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1545 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1546 sb->new_layout = cpu_to_le32(mddev->new_layout);
1547 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1548 sb->new_level = cpu_to_le32(mddev->new_level);
1549 sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors);
1553 list_for_each_entry(rdev2, &mddev->disks, same_set)
1554 if (rdev2->desc_nr+1 > max_dev)
1555 max_dev = rdev2->desc_nr+1;
1557 if (max_dev > le32_to_cpu(sb->max_dev)) {
1559 sb->max_dev = cpu_to_le32(max_dev);
1560 rdev->sb_size = max_dev * 2 + 256;
1561 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1562 if (rdev->sb_size & bmask)
1563 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1565 for (i=0; i<max_dev;i++)
1566 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1568 list_for_each_entry(rdev2, &mddev->disks, same_set) {
1570 if (test_bit(Faulty, &rdev2->flags))
1571 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1572 else if (test_bit(In_sync, &rdev2->flags))
1573 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1574 else if (rdev2->raid_disk >= 0)
1575 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1577 sb->dev_roles[i] = cpu_to_le16(0xffff);
1580 sb->sb_csum = calc_sb_1_csum(sb);
1583 static unsigned long long
1584 super_1_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors)
1586 struct mdp_superblock_1 *sb;
1587 sector_t max_sectors;
1588 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1589 return 0; /* component must fit device */
1590 if (rdev->sb_start < rdev->data_offset) {
1591 /* minor versions 1 and 2; superblock before data */
1592 max_sectors = rdev->bdev->bd_inode->i_size >> 9;
1593 max_sectors -= rdev->data_offset;
1594 if (!num_sectors || num_sectors > max_sectors)
1595 num_sectors = max_sectors;
1596 } else if (rdev->mddev->bitmap_info.offset) {
1597 /* minor version 0 with bitmap we can't move */
1600 /* minor version 0; superblock after data */
1602 sb_start = (rdev->bdev->bd_inode->i_size >> 9) - 8*2;
1603 sb_start &= ~(sector_t)(4*2 - 1);
1604 max_sectors = rdev->sectors + sb_start - rdev->sb_start;
1605 if (!num_sectors || num_sectors > max_sectors)
1606 num_sectors = max_sectors;
1607 rdev->sb_start = sb_start;
1609 sb = (struct mdp_superblock_1 *) page_address(rdev->sb_page);
1610 sb->data_size = cpu_to_le64(num_sectors);
1611 sb->super_offset = rdev->sb_start;
1612 sb->sb_csum = calc_sb_1_csum(sb);
1613 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1615 md_super_wait(rdev->mddev);
1616 return num_sectors / 2; /* kB for sysfs */
1619 static struct super_type super_types[] = {
1622 .owner = THIS_MODULE,
1623 .load_super = super_90_load,
1624 .validate_super = super_90_validate,
1625 .sync_super = super_90_sync,
1626 .rdev_size_change = super_90_rdev_size_change,
1630 .owner = THIS_MODULE,
1631 .load_super = super_1_load,
1632 .validate_super = super_1_validate,
1633 .sync_super = super_1_sync,
1634 .rdev_size_change = super_1_rdev_size_change,
1638 static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)
1640 mdk_rdev_t *rdev, *rdev2;
1643 rdev_for_each_rcu(rdev, mddev1)
1644 rdev_for_each_rcu(rdev2, mddev2)
1645 if (rdev->bdev->bd_contains ==
1646 rdev2->bdev->bd_contains) {
1654 static LIST_HEAD(pending_raid_disks);
1657 * Try to register data integrity profile for an mddev
1659 * This is called when an array is started and after a disk has been kicked
1660 * from the array. It only succeeds if all working and active component devices
1661 * are integrity capable with matching profiles.
1663 int md_integrity_register(mddev_t *mddev)
1665 mdk_rdev_t *rdev, *reference = NULL;
1667 if (list_empty(&mddev->disks))
1668 return 0; /* nothing to do */
1669 if (blk_get_integrity(mddev->gendisk))
1670 return 0; /* already registered */
1671 list_for_each_entry(rdev, &mddev->disks, same_set) {
1672 /* skip spares and non-functional disks */
1673 if (test_bit(Faulty, &rdev->flags))
1675 if (rdev->raid_disk < 0)
1678 * If at least one rdev is not integrity capable, we can not
1679 * enable data integrity for the md device.
1681 if (!bdev_get_integrity(rdev->bdev))
1684 /* Use the first rdev as the reference */
1688 /* does this rdev's profile match the reference profile? */
1689 if (blk_integrity_compare(reference->bdev->bd_disk,
1690 rdev->bdev->bd_disk) < 0)
1694 * All component devices are integrity capable and have matching
1695 * profiles, register the common profile for the md device.
1697 if (blk_integrity_register(mddev->gendisk,
1698 bdev_get_integrity(reference->bdev)) != 0) {
1699 printk(KERN_ERR "md: failed to register integrity for %s\n",
1703 printk(KERN_NOTICE "md: data integrity on %s enabled\n",
1707 EXPORT_SYMBOL(md_integrity_register);
1709 /* Disable data integrity if non-capable/non-matching disk is being added */
1710 void md_integrity_add_rdev(mdk_rdev_t *rdev, mddev_t *mddev)
1712 struct blk_integrity *bi_rdev = bdev_get_integrity(rdev->bdev);
1713 struct blk_integrity *bi_mddev = blk_get_integrity(mddev->gendisk);
1715 if (!bi_mddev) /* nothing to do */
1717 if (rdev->raid_disk < 0) /* skip spares */
1719 if (bi_rdev && blk_integrity_compare(mddev->gendisk,
1720 rdev->bdev->bd_disk) >= 0)
1722 printk(KERN_NOTICE "disabling data integrity on %s\n", mdname(mddev));
1723 blk_integrity_unregister(mddev->gendisk);
1725 EXPORT_SYMBOL(md_integrity_add_rdev);
1727 static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
1729 char b[BDEVNAME_SIZE];
1739 /* prevent duplicates */
1740 if (find_rdev(mddev, rdev->bdev->bd_dev))
1743 /* make sure rdev->sectors exceeds mddev->dev_sectors */
1744 if (rdev->sectors && (mddev->dev_sectors == 0 ||
1745 rdev->sectors < mddev->dev_sectors)) {
1747 /* Cannot change size, so fail
1748 * If mddev->level <= 0, then we don't care
1749 * about aligning sizes (e.g. linear)
1751 if (mddev->level > 0)
1754 mddev->dev_sectors = rdev->sectors;
1757 /* Verify rdev->desc_nr is unique.
1758 * If it is -1, assign a free number, else
1759 * check number is not in use
1761 if (rdev->desc_nr < 0) {
1763 if (mddev->pers) choice = mddev->raid_disks;
1764 while (find_rdev_nr(mddev, choice))
1766 rdev->desc_nr = choice;
1768 if (find_rdev_nr(mddev, rdev->desc_nr))
1771 if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) {
1772 printk(KERN_WARNING "md: %s: array is limited to %d devices\n",
1773 mdname(mddev), mddev->max_disks);
1776 bdevname(rdev->bdev,b);
1777 while ( (s=strchr(b, '/')) != NULL)
1780 rdev->mddev = mddev;
1781 printk(KERN_INFO "md: bind<%s>\n", b);
1783 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
1786 ko = &part_to_dev(rdev->bdev->bd_part)->kobj;
1787 if ((err = sysfs_create_link(&rdev->kobj, ko, "block"))) {
1788 kobject_del(&rdev->kobj);
1791 rdev->sysfs_state = sysfs_get_dirent(rdev->kobj.sd, "state");
1793 list_add_rcu(&rdev->same_set, &mddev->disks);
1794 bd_claim_by_disk(rdev->bdev, rdev->bdev->bd_holder, mddev->gendisk);
1796 /* May as well allow recovery to be retried once */
1797 mddev->recovery_disabled = 0;
1802 printk(KERN_WARNING "md: failed to register dev-%s for %s\n",
1807 static void md_delayed_delete(struct work_struct *ws)
1809 mdk_rdev_t *rdev = container_of(ws, mdk_rdev_t, del_work);
1810 kobject_del(&rdev->kobj);
1811 kobject_put(&rdev->kobj);
1814 static void unbind_rdev_from_array(mdk_rdev_t * rdev)
1816 char b[BDEVNAME_SIZE];
1821 bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk);
1822 list_del_rcu(&rdev->same_set);
1823 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
1825 sysfs_remove_link(&rdev->kobj, "block");
1826 sysfs_put(rdev->sysfs_state);
1827 rdev->sysfs_state = NULL;
1828 /* We need to delay this, otherwise we can deadlock when
1829 * writing to 'remove' to "dev/state". We also need
1830 * to delay it due to rcu usage.
1833 INIT_WORK(&rdev->del_work, md_delayed_delete);
1834 kobject_get(&rdev->kobj);
1835 schedule_work(&rdev->del_work);
1839 * prevent the device from being mounted, repartitioned or
1840 * otherwise reused by a RAID array (or any other kernel
1841 * subsystem), by bd_claiming the device.
1843 static int lock_rdev(mdk_rdev_t *rdev, dev_t dev, int shared)
1846 struct block_device *bdev;
1847 char b[BDEVNAME_SIZE];
1849 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
1851 printk(KERN_ERR "md: could not open %s.\n",
1852 __bdevname(dev, b));
1853 return PTR_ERR(bdev);
1855 err = bd_claim(bdev, shared ? (mdk_rdev_t *)lock_rdev : rdev);
1857 printk(KERN_ERR "md: could not bd_claim %s.\n",
1859 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
1863 set_bit(AllReserved, &rdev->flags);
1868 static void unlock_rdev(mdk_rdev_t *rdev)
1870 struct block_device *bdev = rdev->bdev;
1875 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
1878 void md_autodetect_dev(dev_t dev);
1880 static void export_rdev(mdk_rdev_t * rdev)
1882 char b[BDEVNAME_SIZE];
1883 printk(KERN_INFO "md: export_rdev(%s)\n",
1884 bdevname(rdev->bdev,b));
1889 if (test_bit(AutoDetected, &rdev->flags))
1890 md_autodetect_dev(rdev->bdev->bd_dev);
1893 kobject_put(&rdev->kobj);
1896 static void kick_rdev_from_array(mdk_rdev_t * rdev)
1898 unbind_rdev_from_array(rdev);
1902 static void export_array(mddev_t *mddev)
1904 mdk_rdev_t *rdev, *tmp;
1906 rdev_for_each(rdev, tmp, mddev) {
1911 kick_rdev_from_array(rdev);
1913 if (!list_empty(&mddev->disks))
1915 mddev->raid_disks = 0;
1916 mddev->major_version = 0;
1919 static void print_desc(mdp_disk_t *desc)
1921 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
1922 desc->major,desc->minor,desc->raid_disk,desc->state);
1925 static void print_sb_90(mdp_super_t *sb)
1930 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1931 sb->major_version, sb->minor_version, sb->patch_version,
1932 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
1934 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1935 sb->level, sb->size, sb->nr_disks, sb->raid_disks,
1936 sb->md_minor, sb->layout, sb->chunk_size);
1937 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
1938 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1939 sb->utime, sb->state, sb->active_disks, sb->working_disks,
1940 sb->failed_disks, sb->spare_disks,
1941 sb->sb_csum, (unsigned long)sb->events_lo);
1944 for (i = 0; i < MD_SB_DISKS; i++) {
1947 desc = sb->disks + i;
1948 if (desc->number || desc->major || desc->minor ||
1949 desc->raid_disk || (desc->state && (desc->state != 4))) {
1950 printk(" D %2d: ", i);
1954 printk(KERN_INFO "md: THIS: ");
1955 print_desc(&sb->this_disk);
1958 static void print_sb_1(struct mdp_superblock_1 *sb)
1962 uuid = sb->set_uuid;
1964 "md: SB: (V:%u) (F:0x%08x) Array-ID:<%pU>\n"
1965 "md: Name: \"%s\" CT:%llu\n",
1966 le32_to_cpu(sb->major_version),
1967 le32_to_cpu(sb->feature_map),
1970 (unsigned long long)le64_to_cpu(sb->ctime)
1971 & MD_SUPERBLOCK_1_TIME_SEC_MASK);
1973 uuid = sb->device_uuid;
1975 "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu"
1977 "md: Dev:%08x UUID: %pU\n"
1978 "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n"
1979 "md: (MaxDev:%u) \n",
1980 le32_to_cpu(sb->level),
1981 (unsigned long long)le64_to_cpu(sb->size),
1982 le32_to_cpu(sb->raid_disks),
1983 le32_to_cpu(sb->layout),
1984 le32_to_cpu(sb->chunksize),
1985 (unsigned long long)le64_to_cpu(sb->data_offset),
1986 (unsigned long long)le64_to_cpu(sb->data_size),
1987 (unsigned long long)le64_to_cpu(sb->super_offset),
1988 (unsigned long long)le64_to_cpu(sb->recovery_offset),
1989 le32_to_cpu(sb->dev_number),
1992 (unsigned long long)le64_to_cpu(sb->utime) & MD_SUPERBLOCK_1_TIME_SEC_MASK,
1993 (unsigned long long)le64_to_cpu(sb->events),
1994 (unsigned long long)le64_to_cpu(sb->resync_offset),
1995 le32_to_cpu(sb->sb_csum),
1996 le32_to_cpu(sb->max_dev)
2000 static void print_rdev(mdk_rdev_t *rdev, int major_version)
2002 char b[BDEVNAME_SIZE];
2003 printk(KERN_INFO "md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n",
2004 bdevname(rdev->bdev, b), (unsigned long long)rdev->sectors,
2005 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
2007 if (rdev->sb_loaded) {
2008 printk(KERN_INFO "md: rdev superblock (MJ:%d):\n", major_version);
2009 switch (major_version) {
2011 print_sb_90((mdp_super_t*)page_address(rdev->sb_page));
2014 print_sb_1((struct mdp_superblock_1 *)page_address(rdev->sb_page));
2018 printk(KERN_INFO "md: no rdev superblock!\n");
2021 static void md_print_devices(void)
2023 struct list_head *tmp;
2026 char b[BDEVNAME_SIZE];
2029 printk("md: **********************************\n");
2030 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
2031 printk("md: **********************************\n");
2032 for_each_mddev(mddev, tmp) {
2035 bitmap_print_sb(mddev->bitmap);
2037 printk("%s: ", mdname(mddev));
2038 list_for_each_entry(rdev, &mddev->disks, same_set)
2039 printk("<%s>", bdevname(rdev->bdev,b));
2042 list_for_each_entry(rdev, &mddev->disks, same_set)
2043 print_rdev(rdev, mddev->major_version);
2045 printk("md: **********************************\n");
2050 static void sync_sbs(mddev_t * mddev, int nospares)
2052 /* Update each superblock (in-memory image), but
2053 * if we are allowed to, skip spares which already
2054 * have the right event counter, or have one earlier
2055 * (which would mean they aren't being marked as dirty
2056 * with the rest of the array)
2060 /* First make sure individual recovery_offsets are correct */
2061 list_for_each_entry(rdev, &mddev->disks, same_set) {
2062 if (rdev->raid_disk >= 0 &&
2063 !test_bit(In_sync, &rdev->flags) &&
2064 mddev->curr_resync_completed > rdev->recovery_offset)
2065 rdev->recovery_offset = mddev->curr_resync_completed;
2068 list_for_each_entry(rdev, &mddev->disks, same_set) {
2069 if (rdev->sb_events == mddev->events ||
2071 rdev->raid_disk < 0 &&
2072 (rdev->sb_events&1)==0 &&
2073 rdev->sb_events+1 == mddev->events)) {
2074 /* Don't update this superblock */
2075 rdev->sb_loaded = 2;
2077 super_types[mddev->major_version].
2078 sync_super(mddev, rdev);
2079 rdev->sb_loaded = 1;
2084 static void md_update_sb(mddev_t * mddev, int force_change)
2090 mddev->utime = get_seconds();
2091 if (mddev->external)
2094 spin_lock_irq(&mddev->write_lock);
2096 set_bit(MD_CHANGE_PENDING, &mddev->flags);
2097 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
2099 if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags))
2100 /* just a clean<-> dirty transition, possibly leave spares alone,
2101 * though if events isn't the right even/odd, we will have to do
2107 if (mddev->degraded)
2108 /* If the array is degraded, then skipping spares is both
2109 * dangerous and fairly pointless.
2110 * Dangerous because a device that was removed from the array
2111 * might have a event_count that still looks up-to-date,
2112 * so it can be re-added without a resync.
2113 * Pointless because if there are any spares to skip,
2114 * then a recovery will happen and soon that array won't
2115 * be degraded any more and the spare can go back to sleep then.
2119 sync_req = mddev->in_sync;
2121 /* If this is just a dirty<->clean transition, and the array is clean
2122 * and 'events' is odd, we can roll back to the previous clean state */
2124 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
2125 && (mddev->events & 1)
2126 && mddev->events != 1)
2129 /* otherwise we have to go forward and ... */
2131 if (!mddev->in_sync || mddev->recovery_cp != MaxSector) { /* not clean */
2132 /* .. if the array isn't clean, an 'even' event must also go
2134 if ((mddev->events&1)==0)
2137 /* otherwise an 'odd' event must go to spares */
2138 if ((mddev->events&1))
2143 if (!mddev->events) {
2145 * oops, this 64-bit counter should never wrap.
2146 * Either we are in around ~1 trillion A.C., assuming
2147 * 1 reboot per second, or we have a bug:
2154 * do not write anything to disk if using
2155 * nonpersistent superblocks
2157 if (!mddev->persistent) {
2158 if (!mddev->external)
2159 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2161 spin_unlock_irq(&mddev->write_lock);
2162 wake_up(&mddev->sb_wait);
2165 sync_sbs(mddev, nospares);
2166 spin_unlock_irq(&mddev->write_lock);
2169 "md: updating %s RAID superblock on device (in sync %d)\n",
2170 mdname(mddev),mddev->in_sync);
2172 bitmap_update_sb(mddev->bitmap);
2173 list_for_each_entry(rdev, &mddev->disks, same_set) {
2174 char b[BDEVNAME_SIZE];
2175 dprintk(KERN_INFO "md: ");
2176 if (rdev->sb_loaded != 1)
2177 continue; /* no noise on spare devices */
2178 if (test_bit(Faulty, &rdev->flags))
2179 dprintk("(skipping faulty ");
2181 dprintk("%s ", bdevname(rdev->bdev,b));
2182 if (!test_bit(Faulty, &rdev->flags)) {
2183 md_super_write(mddev,rdev,
2184 rdev->sb_start, rdev->sb_size,
2186 dprintk(KERN_INFO "(write) %s's sb offset: %llu\n",
2187 bdevname(rdev->bdev,b),
2188 (unsigned long long)rdev->sb_start);
2189 rdev->sb_events = mddev->events;
2193 if (mddev->level == LEVEL_MULTIPATH)
2194 /* only need to write one superblock... */
2197 md_super_wait(mddev);
2198 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2200 spin_lock_irq(&mddev->write_lock);
2201 if (mddev->in_sync != sync_req ||
2202 test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
2203 /* have to write it out again */
2204 spin_unlock_irq(&mddev->write_lock);
2207 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2208 spin_unlock_irq(&mddev->write_lock);
2209 wake_up(&mddev->sb_wait);
2210 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
2211 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
2215 /* words written to sysfs files may, or may not, be \n terminated.
2216 * We want to accept with case. For this we use cmd_match.
2218 static int cmd_match(const char *cmd, const char *str)
2220 /* See if cmd, written into a sysfs file, matches
2221 * str. They must either be the same, or cmd can
2222 * have a trailing newline
2224 while (*cmd && *str && *cmd == *str) {
2235 struct rdev_sysfs_entry {
2236 struct attribute attr;
2237 ssize_t (*show)(mdk_rdev_t *, char *);
2238 ssize_t (*store)(mdk_rdev_t *, const char *, size_t);
2242 state_show(mdk_rdev_t *rdev, char *page)
2247 if (test_bit(Faulty, &rdev->flags)) {
2248 len+= sprintf(page+len, "%sfaulty",sep);
2251 if (test_bit(In_sync, &rdev->flags)) {
2252 len += sprintf(page+len, "%sin_sync",sep);
2255 if (test_bit(WriteMostly, &rdev->flags)) {
2256 len += sprintf(page+len, "%swrite_mostly",sep);
2259 if (test_bit(Blocked, &rdev->flags)) {
2260 len += sprintf(page+len, "%sblocked", sep);
2263 if (!test_bit(Faulty, &rdev->flags) &&
2264 !test_bit(In_sync, &rdev->flags)) {
2265 len += sprintf(page+len, "%sspare", sep);
2268 return len+sprintf(page+len, "\n");
2272 state_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2275 * faulty - simulates and error
2276 * remove - disconnects the device
2277 * writemostly - sets write_mostly
2278 * -writemostly - clears write_mostly
2279 * blocked - sets the Blocked flag
2280 * -blocked - clears the Blocked flag
2281 * insync - sets Insync providing device isn't active
2284 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
2285 md_error(rdev->mddev, rdev);
2287 } else if (cmd_match(buf, "remove")) {
2288 if (rdev->raid_disk >= 0)
2291 mddev_t *mddev = rdev->mddev;
2292 kick_rdev_from_array(rdev);
2294 md_update_sb(mddev, 1);
2295 md_new_event(mddev);
2298 } else if (cmd_match(buf, "writemostly")) {
2299 set_bit(WriteMostly, &rdev->flags);
2301 } else if (cmd_match(buf, "-writemostly")) {
2302 clear_bit(WriteMostly, &rdev->flags);
2304 } else if (cmd_match(buf, "blocked")) {
2305 set_bit(Blocked, &rdev->flags);
2307 } else if (cmd_match(buf, "-blocked")) {
2308 clear_bit(Blocked, &rdev->flags);
2309 wake_up(&rdev->blocked_wait);
2310 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2311 md_wakeup_thread(rdev->mddev->thread);
2314 } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) {
2315 set_bit(In_sync, &rdev->flags);
2318 if (!err && rdev->sysfs_state)
2319 sysfs_notify_dirent(rdev->sysfs_state);
2320 return err ? err : len;
2322 static struct rdev_sysfs_entry rdev_state =
2323 __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store);
2326 errors_show(mdk_rdev_t *rdev, char *page)
2328 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
2332 errors_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2335 unsigned long n = simple_strtoul(buf, &e, 10);
2336 if (*buf && (*e == 0 || *e == '\n')) {
2337 atomic_set(&rdev->corrected_errors, n);
2342 static struct rdev_sysfs_entry rdev_errors =
2343 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
2346 slot_show(mdk_rdev_t *rdev, char *page)
2348 if (rdev->raid_disk < 0)
2349 return sprintf(page, "none\n");
2351 return sprintf(page, "%d\n", rdev->raid_disk);
2355 slot_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2360 int slot = simple_strtoul(buf, &e, 10);
2361 if (strncmp(buf, "none", 4)==0)
2363 else if (e==buf || (*e && *e!= '\n'))
2365 if (rdev->mddev->pers && slot == -1) {
2366 /* Setting 'slot' on an active array requires also
2367 * updating the 'rd%d' link, and communicating
2368 * with the personality with ->hot_*_disk.
2369 * For now we only support removing
2370 * failed/spare devices. This normally happens automatically,
2371 * but not when the metadata is externally managed.
2373 if (rdev->raid_disk == -1)
2375 /* personality does all needed checks */
2376 if (rdev->mddev->pers->hot_add_disk == NULL)
2378 err = rdev->mddev->pers->
2379 hot_remove_disk(rdev->mddev, rdev->raid_disk);
2382 sprintf(nm, "rd%d", rdev->raid_disk);
2383 sysfs_remove_link(&rdev->mddev->kobj, nm);
2384 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2385 md_wakeup_thread(rdev->mddev->thread);
2386 } else if (rdev->mddev->pers) {
2388 /* Activating a spare .. or possibly reactivating
2389 * if we ever get bitmaps working here.
2392 if (rdev->raid_disk != -1)
2395 if (rdev->mddev->pers->hot_add_disk == NULL)
2398 list_for_each_entry(rdev2, &rdev->mddev->disks, same_set)
2399 if (rdev2->raid_disk == slot)
2402 rdev->raid_disk = slot;
2403 if (test_bit(In_sync, &rdev->flags))
2404 rdev->saved_raid_disk = slot;
2406 rdev->saved_raid_disk = -1;
2407 err = rdev->mddev->pers->
2408 hot_add_disk(rdev->mddev, rdev);
2410 rdev->raid_disk = -1;
2413 sysfs_notify_dirent(rdev->sysfs_state);
2414 sprintf(nm, "rd%d", rdev->raid_disk);
2415 if (sysfs_create_link(&rdev->mddev->kobj, &rdev->kobj, nm))
2417 "md: cannot register "
2419 nm, mdname(rdev->mddev));
2421 /* don't wakeup anyone, leave that to userspace. */
2423 if (slot >= rdev->mddev->raid_disks)
2425 rdev->raid_disk = slot;
2426 /* assume it is working */
2427 clear_bit(Faulty, &rdev->flags);
2428 clear_bit(WriteMostly, &rdev->flags);
2429 set_bit(In_sync, &rdev->flags);
2430 sysfs_notify_dirent(rdev->sysfs_state);
2436 static struct rdev_sysfs_entry rdev_slot =
2437 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
2440 offset_show(mdk_rdev_t *rdev, char *page)
2442 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
2446 offset_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2449 unsigned long long offset = simple_strtoull(buf, &e, 10);
2450 if (e==buf || (*e && *e != '\n'))
2452 if (rdev->mddev->pers && rdev->raid_disk >= 0)
2454 if (rdev->sectors && rdev->mddev->external)
2455 /* Must set offset before size, so overlap checks
2458 rdev->data_offset = offset;
2462 static struct rdev_sysfs_entry rdev_offset =
2463 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
2466 rdev_size_show(mdk_rdev_t *rdev, char *page)
2468 return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2);
2471 static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
2473 /* check if two start/length pairs overlap */
2481 static int strict_blocks_to_sectors(const char *buf, sector_t *sectors)
2483 unsigned long long blocks;
2486 if (strict_strtoull(buf, 10, &blocks) < 0)
2489 if (blocks & 1ULL << (8 * sizeof(blocks) - 1))
2490 return -EINVAL; /* sector conversion overflow */
2493 if (new != blocks * 2)
2494 return -EINVAL; /* unsigned long long to sector_t overflow */
2501 rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2503 mddev_t *my_mddev = rdev->mddev;
2504 sector_t oldsectors = rdev->sectors;
2507 if (strict_blocks_to_sectors(buf, §ors) < 0)
2509 if (my_mddev->pers && rdev->raid_disk >= 0) {
2510 if (my_mddev->persistent) {
2511 sectors = super_types[my_mddev->major_version].
2512 rdev_size_change(rdev, sectors);
2515 } else if (!sectors)
2516 sectors = (rdev->bdev->bd_inode->i_size >> 9) -
2519 if (sectors < my_mddev->dev_sectors)
2520 return -EINVAL; /* component must fit device */
2522 rdev->sectors = sectors;
2523 if (sectors > oldsectors && my_mddev->external) {
2524 /* need to check that all other rdevs with the same ->bdev
2525 * do not overlap. We need to unlock the mddev to avoid
2526 * a deadlock. We have already changed rdev->sectors, and if
2527 * we have to change it back, we will have the lock again.
2531 struct list_head *tmp;
2533 mddev_unlock(my_mddev);
2534 for_each_mddev(mddev, tmp) {
2538 list_for_each_entry(rdev2, &mddev->disks, same_set)
2539 if (test_bit(AllReserved, &rdev2->flags) ||
2540 (rdev->bdev == rdev2->bdev &&
2542 overlaps(rdev->data_offset, rdev->sectors,
2548 mddev_unlock(mddev);
2554 mddev_lock(my_mddev);
2556 /* Someone else could have slipped in a size
2557 * change here, but doing so is just silly.
2558 * We put oldsectors back because we *know* it is
2559 * safe, and trust userspace not to race with
2562 rdev->sectors = oldsectors;
2569 static struct rdev_sysfs_entry rdev_size =
2570 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
2573 static ssize_t recovery_start_show(mdk_rdev_t *rdev, char *page)
2575 unsigned long long recovery_start = rdev->recovery_offset;
2577 if (test_bit(In_sync, &rdev->flags) ||
2578 recovery_start == MaxSector)
2579 return sprintf(page, "none\n");
2581 return sprintf(page, "%llu\n", recovery_start);
2584 static ssize_t recovery_start_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2586 unsigned long long recovery_start;
2588 if (cmd_match(buf, "none"))
2589 recovery_start = MaxSector;
2590 else if (strict_strtoull(buf, 10, &recovery_start))
2593 if (rdev->mddev->pers &&
2594 rdev->raid_disk >= 0)
2597 rdev->recovery_offset = recovery_start;
2598 if (recovery_start == MaxSector)
2599 set_bit(In_sync, &rdev->flags);
2601 clear_bit(In_sync, &rdev->flags);
2605 static struct rdev_sysfs_entry rdev_recovery_start =
2606 __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store);
2608 static struct attribute *rdev_default_attrs[] = {
2614 &rdev_recovery_start.attr,
2618 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
2620 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2621 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
2622 mddev_t *mddev = rdev->mddev;
2628 rv = mddev ? mddev_lock(mddev) : -EBUSY;
2630 if (rdev->mddev == NULL)
2633 rv = entry->show(rdev, page);
2634 mddev_unlock(mddev);
2640 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
2641 const char *page, size_t length)
2643 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2644 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
2646 mddev_t *mddev = rdev->mddev;
2650 if (!capable(CAP_SYS_ADMIN))
2652 rv = mddev ? mddev_lock(mddev): -EBUSY;
2654 if (rdev->mddev == NULL)
2657 rv = entry->store(rdev, page, length);
2658 mddev_unlock(mddev);
2663 static void rdev_free(struct kobject *ko)
2665 mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj);
2668 static struct sysfs_ops rdev_sysfs_ops = {
2669 .show = rdev_attr_show,
2670 .store = rdev_attr_store,
2672 static struct kobj_type rdev_ktype = {
2673 .release = rdev_free,
2674 .sysfs_ops = &rdev_sysfs_ops,
2675 .default_attrs = rdev_default_attrs,
2679 * Import a device. If 'super_format' >= 0, then sanity check the superblock
2681 * mark the device faulty if:
2683 * - the device is nonexistent (zero size)
2684 * - the device has no valid superblock
2686 * a faulty rdev _never_ has rdev->sb set.
2688 static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor)
2690 char b[BDEVNAME_SIZE];
2695 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
2697 printk(KERN_ERR "md: could not alloc mem for new device!\n");
2698 return ERR_PTR(-ENOMEM);
2701 if ((err = alloc_disk_sb(rdev)))
2704 err = lock_rdev(rdev, newdev, super_format == -2);
2708 kobject_init(&rdev->kobj, &rdev_ktype);
2711 rdev->saved_raid_disk = -1;
2712 rdev->raid_disk = -1;
2714 rdev->data_offset = 0;
2715 rdev->sb_events = 0;
2716 rdev->last_read_error.tv_sec = 0;
2717 rdev->last_read_error.tv_nsec = 0;
2718 atomic_set(&rdev->nr_pending, 0);
2719 atomic_set(&rdev->read_errors, 0);
2720 atomic_set(&rdev->corrected_errors, 0);
2722 size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
2725 "md: %s has zero or unknown size, marking faulty!\n",
2726 bdevname(rdev->bdev,b));
2731 if (super_format >= 0) {
2732 err = super_types[super_format].
2733 load_super(rdev, NULL, super_minor);
2734 if (err == -EINVAL) {
2736 "md: %s does not have a valid v%d.%d "
2737 "superblock, not importing!\n",
2738 bdevname(rdev->bdev,b),
2739 super_format, super_minor);
2744 "md: could not read %s's sb, not importing!\n",
2745 bdevname(rdev->bdev,b));
2750 INIT_LIST_HEAD(&rdev->same_set);
2751 init_waitqueue_head(&rdev->blocked_wait);
2756 if (rdev->sb_page) {
2762 return ERR_PTR(err);
2766 * Check a full RAID array for plausibility
2770 static void analyze_sbs(mddev_t * mddev)
2773 mdk_rdev_t *rdev, *freshest, *tmp;
2774 char b[BDEVNAME_SIZE];
2777 rdev_for_each(rdev, tmp, mddev)
2778 switch (super_types[mddev->major_version].
2779 load_super(rdev, freshest, mddev->minor_version)) {
2787 "md: fatal superblock inconsistency in %s"
2788 " -- removing from array\n",
2789 bdevname(rdev->bdev,b));
2790 kick_rdev_from_array(rdev);
2794 super_types[mddev->major_version].
2795 validate_super(mddev, freshest);
2798 rdev_for_each(rdev, tmp, mddev) {
2799 if (rdev->desc_nr >= mddev->max_disks ||
2800 i > mddev->max_disks) {
2802 "md: %s: %s: only %d devices permitted\n",
2803 mdname(mddev), bdevname(rdev->bdev, b),
2805 kick_rdev_from_array(rdev);
2808 if (rdev != freshest)
2809 if (super_types[mddev->major_version].
2810 validate_super(mddev, rdev)) {
2811 printk(KERN_WARNING "md: kicking non-fresh %s"
2813 bdevname(rdev->bdev,b));
2814 kick_rdev_from_array(rdev);
2817 if (mddev->level == LEVEL_MULTIPATH) {
2818 rdev->desc_nr = i++;
2819 rdev->raid_disk = rdev->desc_nr;
2820 set_bit(In_sync, &rdev->flags);
2821 } else if (rdev->raid_disk >= (mddev->raid_disks - min(0, mddev->delta_disks))) {
2822 rdev->raid_disk = -1;
2823 clear_bit(In_sync, &rdev->flags);
2828 /* Read a fixed-point number.
2829 * Numbers in sysfs attributes should be in "standard" units where
2830 * possible, so time should be in seconds.
2831 * However we internally use a a much smaller unit such as
2832 * milliseconds or jiffies.
2833 * This function takes a decimal number with a possible fractional
2834 * component, and produces an integer which is the result of
2835 * multiplying that number by 10^'scale'.
2836 * all without any floating-point arithmetic.
2838 int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale)
2840 unsigned long result = 0;
2842 while (isdigit(*cp) || (*cp == '.' && decimals < 0)) {
2845 else if (decimals < scale) {
2848 result = result * 10 + value;
2860 while (decimals < scale) {
2869 static void md_safemode_timeout(unsigned long data);
2872 safe_delay_show(mddev_t *mddev, char *page)
2874 int msec = (mddev->safemode_delay*1000)/HZ;
2875 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
2878 safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len)
2882 if (strict_strtoul_scaled(cbuf, &msec, 3) < 0)
2885 mddev->safemode_delay = 0;
2887 unsigned long old_delay = mddev->safemode_delay;
2888 mddev->safemode_delay = (msec*HZ)/1000;
2889 if (mddev->safemode_delay == 0)
2890 mddev->safemode_delay = 1;
2891 if (mddev->safemode_delay < old_delay)
2892 md_safemode_timeout((unsigned long)mddev);
2896 static struct md_sysfs_entry md_safe_delay =
2897 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
2900 level_show(mddev_t *mddev, char *page)
2902 struct mdk_personality *p = mddev->pers;
2904 return sprintf(page, "%s\n", p->name);
2905 else if (mddev->clevel[0])
2906 return sprintf(page, "%s\n", mddev->clevel);
2907 else if (mddev->level != LEVEL_NONE)
2908 return sprintf(page, "%d\n", mddev->level);
2914 level_store(mddev_t *mddev, const char *buf, size_t len)
2918 struct mdk_personality *pers;
2922 if (mddev->pers == NULL) {
2925 if (len >= sizeof(mddev->clevel))
2927 strncpy(mddev->clevel, buf, len);
2928 if (mddev->clevel[len-1] == '\n')
2930 mddev->clevel[len] = 0;
2931 mddev->level = LEVEL_NONE;
2935 /* request to change the personality. Need to ensure:
2936 * - array is not engaged in resync/recovery/reshape
2937 * - old personality can be suspended
2938 * - new personality will access other array.
2941 if (mddev->sync_thread || mddev->reshape_position != MaxSector)
2944 if (!mddev->pers->quiesce) {
2945 printk(KERN_WARNING "md: %s: %s does not support online personality change\n",
2946 mdname(mddev), mddev->pers->name);
2950 /* Now find the new personality */
2951 if (len == 0 || len >= sizeof(level))
2953 strncpy(level, buf, len);
2954 if (level[len-1] == '\n')
2958 request_module("md-%s", level);
2959 spin_lock(&pers_lock);
2960 pers = find_pers(LEVEL_NONE, level);
2961 if (!pers || !try_module_get(pers->owner)) {
2962 spin_unlock(&pers_lock);
2963 printk(KERN_WARNING "md: personality %s not loaded\n", level);
2966 spin_unlock(&pers_lock);
2968 if (pers == mddev->pers) {
2969 /* Nothing to do! */
2970 module_put(pers->owner);
2973 if (!pers->takeover) {
2974 module_put(pers->owner);
2975 printk(KERN_WARNING "md: %s: %s does not support personality takeover\n",
2976 mdname(mddev), level);
2980 /* ->takeover must set new_* and/or delta_disks
2981 * if it succeeds, and may set them when it fails.
2983 priv = pers->takeover(mddev);
2985 mddev->new_level = mddev->level;
2986 mddev->new_layout = mddev->layout;
2987 mddev->new_chunk_sectors = mddev->chunk_sectors;
2988 mddev->raid_disks -= mddev->delta_disks;
2989 mddev->delta_disks = 0;
2990 module_put(pers->owner);
2991 printk(KERN_WARNING "md: %s: %s would not accept array\n",
2992 mdname(mddev), level);
2993 return PTR_ERR(priv);
2996 /* Looks like we have a winner */
2997 mddev_suspend(mddev);
2998 mddev->pers->stop(mddev);
2999 module_put(mddev->pers->owner);
3000 /* Invalidate devices that are now superfluous */
3001 list_for_each_entry(rdev, &mddev->disks, same_set)
3002 if (rdev->raid_disk >= mddev->raid_disks) {
3003 rdev->raid_disk = -1;
3004 clear_bit(In_sync, &rdev->flags);
3007 mddev->private = priv;
3008 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
3009 mddev->level = mddev->new_level;
3010 mddev->layout = mddev->new_layout;
3011 mddev->chunk_sectors = mddev->new_chunk_sectors;
3012 mddev->delta_disks = 0;
3014 mddev_resume(mddev);
3015 set_bit(MD_CHANGE_DEVS, &mddev->flags);
3016 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3017 md_wakeup_thread(mddev->thread);
3021 static struct md_sysfs_entry md_level =
3022 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
3026 layout_show(mddev_t *mddev, char *page)
3028 /* just a number, not meaningful for all levels */
3029 if (mddev->reshape_position != MaxSector &&
3030 mddev->layout != mddev->new_layout)
3031 return sprintf(page, "%d (%d)\n",
3032 mddev->new_layout, mddev->layout);
3033 return sprintf(page, "%d\n", mddev->layout);
3037 layout_store(mddev_t *mddev, const char *buf, size_t len)
3040 unsigned long n = simple_strtoul(buf, &e, 10);
3042 if (!*buf || (*e && *e != '\n'))
3047 if (mddev->pers->check_reshape == NULL)
3049 mddev->new_layout = n;
3050 err = mddev->pers->check_reshape(mddev);
3052 mddev->new_layout = mddev->layout;
3056 mddev->new_layout = n;
3057 if (mddev->reshape_position == MaxSector)
3062 static struct md_sysfs_entry md_layout =
3063 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
3067 raid_disks_show(mddev_t *mddev, char *page)
3069 if (mddev->raid_disks == 0)
3071 if (mddev->reshape_position != MaxSector &&
3072 mddev->delta_disks != 0)
3073 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
3074 mddev->raid_disks - mddev->delta_disks);
3075 return sprintf(page, "%d\n", mddev->raid_disks);
3078 static int update_raid_disks(mddev_t *mddev, int raid_disks);
3081 raid_disks_store(mddev_t *mddev, const char *buf, size_t len)
3085 unsigned long n = simple_strtoul(buf, &e, 10);
3087 if (!*buf || (*e && *e != '\n'))
3091 rv = update_raid_disks(mddev, n);
3092 else if (mddev->reshape_position != MaxSector) {
3093 int olddisks = mddev->raid_disks - mddev->delta_disks;
3094 mddev->delta_disks = n - olddisks;
3095 mddev->raid_disks = n;
3097 mddev->raid_disks = n;
3098 return rv ? rv : len;
3100 static struct md_sysfs_entry md_raid_disks =
3101 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
3104 chunk_size_show(mddev_t *mddev, char *page)
3106 if (mddev->reshape_position != MaxSector &&
3107 mddev->chunk_sectors != mddev->new_chunk_sectors)
3108 return sprintf(page, "%d (%d)\n",
3109 mddev->new_chunk_sectors << 9,
3110 mddev->chunk_sectors << 9);
3111 return sprintf(page, "%d\n", mddev->chunk_sectors << 9);
3115 chunk_size_store(mddev_t *mddev, const char *buf, size_t len)
3118 unsigned long n = simple_strtoul(buf, &e, 10);
3120 if (!*buf || (*e && *e != '\n'))
3125 if (mddev->pers->check_reshape == NULL)
3127 mddev->new_chunk_sectors = n >> 9;
3128 err = mddev->pers->check_reshape(mddev);
3130 mddev->new_chunk_sectors = mddev->chunk_sectors;
3134 mddev->new_chunk_sectors = n >> 9;
3135 if (mddev->reshape_position == MaxSector)
3136 mddev->chunk_sectors = n >> 9;
3140 static struct md_sysfs_entry md_chunk_size =
3141 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
3144 resync_start_show(mddev_t *mddev, char *page)
3146 if (mddev->recovery_cp == MaxSector)
3147 return sprintf(page, "none\n");
3148 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
3152 resync_start_store(mddev_t *mddev, const char *buf, size_t len)
3155 unsigned long long n = simple_strtoull(buf, &e, 10);
3159 if (cmd_match(buf, "none"))
3161 else if (!*buf || (*e && *e != '\n'))
3164 mddev->recovery_cp = n;
3167 static struct md_sysfs_entry md_resync_start =
3168 __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store);
3171 * The array state can be:
3174 * No devices, no size, no level
3175 * Equivalent to STOP_ARRAY ioctl
3177 * May have some settings, but array is not active
3178 * all IO results in error
3179 * When written, doesn't tear down array, but just stops it
3180 * suspended (not supported yet)
3181 * All IO requests will block. The array can be reconfigured.
3182 * Writing this, if accepted, will block until array is quiescent
3184 * no resync can happen. no superblocks get written.
3185 * write requests fail
3187 * like readonly, but behaves like 'clean' on a write request.
3189 * clean - no pending writes, but otherwise active.
3190 * When written to inactive array, starts without resync
3191 * If a write request arrives then
3192 * if metadata is known, mark 'dirty' and switch to 'active'.
3193 * if not known, block and switch to write-pending
3194 * If written to an active array that has pending writes, then fails.
3196 * fully active: IO and resync can be happening.
3197 * When written to inactive array, starts with resync
3200 * clean, but writes are blocked waiting for 'active' to be written.
3203 * like active, but no writes have been seen for a while (100msec).
3206 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
3207 write_pending, active_idle, bad_word};
3208 static char *array_states[] = {
3209 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3210 "write-pending", "active-idle", NULL };
3212 static int match_word(const char *word, char **list)
3215 for (n=0; list[n]; n++)
3216 if (cmd_match(word, list[n]))
3222 array_state_show(mddev_t *mddev, char *page)
3224 enum array_state st = inactive;
3237 else if (test_bit(MD_CHANGE_CLEAN, &mddev->flags))
3239 else if (mddev->safemode)
3245 if (list_empty(&mddev->disks) &&
3246 mddev->raid_disks == 0 &&
3247 mddev->dev_sectors == 0)
3252 return sprintf(page, "%s\n", array_states[st]);
3255 static int do_md_stop(mddev_t * mddev, int ro, int is_open);
3256 static int do_md_run(mddev_t * mddev);
3257 static int restart_array(mddev_t *mddev);
3260 array_state_store(mddev_t *mddev, const char *buf, size_t len)
3263 enum array_state st = match_word(buf, array_states);
3268 /* stopping an active array */
3269 if (atomic_read(&mddev->openers) > 0)
3271 err = do_md_stop(mddev, 0, 0);
3274 /* stopping an active array */
3276 if (atomic_read(&mddev->openers) > 0)
3278 err = do_md_stop(mddev, 2, 0);
3280 err = 0; /* already inactive */
3283 break; /* not supported yet */
3286 err = do_md_stop(mddev, 1, 0);
3289 set_disk_ro(mddev->gendisk, 1);
3290 err = do_md_run(mddev);
3296 err = do_md_stop(mddev, 1, 0);
3297 else if (mddev->ro == 1)
3298 err = restart_array(mddev);
3301 set_disk_ro(mddev->gendisk, 0);
3305 err = do_md_run(mddev);
3310 restart_array(mddev);
3311 spin_lock_irq(&mddev->write_lock);
3312 if (atomic_read(&mddev->writes_pending) == 0) {
3313 if (mddev->in_sync == 0) {
3315 if (mddev->safemode == 1)
3316 mddev->safemode = 0;
3317 if (mddev->persistent)
3318 set_bit(MD_CHANGE_CLEAN,
3324 spin_unlock_irq(&mddev->write_lock);
3330 restart_array(mddev);
3331 if (mddev->external)
3332 clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
3333 wake_up(&mddev->sb_wait);
3337 set_disk_ro(mddev->gendisk, 0);
3338 err = do_md_run(mddev);
3343 /* these cannot be set */
3349 sysfs_notify_dirent(mddev->sysfs_state);
3353 static struct md_sysfs_entry md_array_state =
3354 __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
3357 max_corrected_read_errors_show(mddev_t *mddev, char *page) {
3358 return sprintf(page, "%d\n",
3359 atomic_read(&mddev->max_corr_read_errors));
3363 max_corrected_read_errors_store(mddev_t *mddev, const char *buf, size_t len)
3366 unsigned long n = simple_strtoul(buf, &e, 10);
3368 if (*buf && (*e == 0 || *e == '\n')) {
3369 atomic_set(&mddev->max_corr_read_errors, n);
3375 static struct md_sysfs_entry max_corr_read_errors =
3376 __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show,
3377 max_corrected_read_errors_store);
3380 null_show(mddev_t *mddev, char *page)
3386 new_dev_store(mddev_t *mddev, const char *buf, size_t len)
3388 /* buf must be %d:%d\n? giving major and minor numbers */
3389 /* The new device is added to the array.
3390 * If the array has a persistent superblock, we read the
3391 * superblock to initialise info and check validity.
3392 * Otherwise, only checking done is that in bind_rdev_to_array,
3393 * which mainly checks size.
3396 int major = simple_strtoul(buf, &e, 10);
3402 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
3404 minor = simple_strtoul(e+1, &e, 10);
3405 if (*e && *e != '\n')
3407 dev = MKDEV(major, minor);
3408 if (major != MAJOR(dev) ||
3409 minor != MINOR(dev))
3413 if (mddev->persistent) {
3414 rdev = md_import_device(dev, mddev->major_version,
3415 mddev->minor_version);
3416 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
3417 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
3418 mdk_rdev_t, same_set);
3419 err = super_types[mddev->major_version]
3420 .load_super(rdev, rdev0, mddev->minor_version);
3424 } else if (mddev->external)
3425 rdev = md_import_device(dev, -2, -1);
3427 rdev = md_import_device(dev, -1, -1);
3430 return PTR_ERR(rdev);
3431 err = bind_rdev_to_array(rdev, mddev);
3435 return err ? err : len;
3438 static struct md_sysfs_entry md_new_device =
3439 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
3442 bitmap_store(mddev_t *mddev, const char *buf, size_t len)
3445 unsigned long chunk, end_chunk;
3449 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
3451 chunk = end_chunk = simple_strtoul(buf, &end, 0);
3452 if (buf == end) break;
3453 if (*end == '-') { /* range */
3455 end_chunk = simple_strtoul(buf, &end, 0);
3456 if (buf == end) break;
3458 if (*end && !isspace(*end)) break;
3459 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
3460 buf = skip_spaces(end);
3462 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
3467 static struct md_sysfs_entry md_bitmap =
3468 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
3471 size_show(mddev_t *mddev, char *page)
3473 return sprintf(page, "%llu\n",
3474 (unsigned long long)mddev->dev_sectors / 2);
3477 static int update_size(mddev_t *mddev, sector_t num_sectors);
3480 size_store(mddev_t *mddev, const char *buf, size_t len)
3482 /* If array is inactive, we can reduce the component size, but
3483 * not increase it (except from 0).
3484 * If array is active, we can try an on-line resize
3487 int err = strict_blocks_to_sectors(buf, §ors);
3492 err = update_size(mddev, sectors);
3493 md_update_sb(mddev, 1);
3495 if (mddev->dev_sectors == 0 ||
3496 mddev->dev_sectors > sectors)
3497 mddev->dev_sectors = sectors;
3501 return err ? err : len;
3504 static struct md_sysfs_entry md_size =
3505 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
3510 * 'none' for arrays with no metadata (good luck...)
3511 * 'external' for arrays with externally managed metadata,
3512 * or N.M for internally known formats
3515 metadata_show(mddev_t *mddev, char *page)
3517 if (mddev->persistent)
3518 return sprintf(page, "%d.%d\n",
3519 mddev->major_version, mddev->minor_version);
3520 else if (mddev->external)
3521 return sprintf(page, "external:%s\n", mddev->metadata_type);
3523 return sprintf(page, "none\n");
3527 metadata_store(mddev_t *mddev, const char *buf, size_t len)
3531 /* Changing the details of 'external' metadata is
3532 * always permitted. Otherwise there must be
3533 * no devices attached to the array.
3535 if (mddev->external && strncmp(buf, "external:", 9) == 0)
3537 else if (!list_empty(&mddev->disks))
3540 if (cmd_match(buf, "none")) {
3541 mddev->persistent = 0;
3542 mddev->external = 0;
3543 mddev->major_version = 0;
3544 mddev->minor_version = 90;
3547 if (strncmp(buf, "external:", 9) == 0) {
3548 size_t namelen = len-9;
3549 if (namelen >= sizeof(mddev->metadata_type))
3550 namelen = sizeof(mddev->metadata_type)-1;
3551 strncpy(mddev->metadata_type, buf+9, namelen);
3552 mddev->metadata_type[namelen] = 0;
3553 if (namelen && mddev->metadata_type[namelen-1] == '\n')
3554 mddev->metadata_type[--namelen] = 0;
3555 mddev->persistent = 0;
3556 mddev->external = 1;
3557 mddev->major_version = 0;
3558 mddev->minor_version = 90;
3561 major = simple_strtoul(buf, &e, 10);
3562 if (e==buf || *e != '.')
3565 minor = simple_strtoul(buf, &e, 10);
3566 if (e==buf || (*e && *e != '\n') )
3568 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
3570 mddev->major_version = major;
3571 mddev->minor_version = minor;
3572 mddev->persistent = 1;
3573 mddev->external = 0;
3577 static struct md_sysfs_entry md_metadata =
3578 __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
3581 action_show(mddev_t *mddev, char *page)
3583 char *type = "idle";
3584 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
3586 else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3587 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) {
3588 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
3590 else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
3591 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
3593 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
3597 } else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
3600 return sprintf(page, "%s\n", type);
3604 action_store(mddev_t *mddev, const char *page, size_t len)
3606 if (!mddev->pers || !mddev->pers->sync_request)
3609 if (cmd_match(page, "frozen"))
3610 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3612 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3614 if (cmd_match(page, "idle") || cmd_match(page, "frozen")) {
3615 if (mddev->sync_thread) {
3616 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
3617 md_unregister_thread(mddev->sync_thread);
3618 mddev->sync_thread = NULL;
3619 mddev->recovery = 0;
3621 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3622 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
3624 else if (cmd_match(page, "resync"))
3625 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3626 else if (cmd_match(page, "recover")) {
3627 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
3628 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3629 } else if (cmd_match(page, "reshape")) {
3631 if (mddev->pers->start_reshape == NULL)
3633 err = mddev->pers->start_reshape(mddev);
3636 sysfs_notify(&mddev->kobj, NULL, "degraded");
3638 if (cmd_match(page, "check"))
3639 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
3640 else if (!cmd_match(page, "repair"))
3642 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
3643 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
3645 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3646 md_wakeup_thread(mddev->thread);
3647 sysfs_notify_dirent(mddev->sysfs_action);
3652 mismatch_cnt_show(mddev_t *mddev, char *page)
3654 return sprintf(page, "%llu\n",
3655 (unsigned long long) mddev->resync_mismatches);
3658 static struct md_sysfs_entry md_scan_mode =
3659 __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
3662 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
3665 sync_min_show(mddev_t *mddev, char *page)
3667 return sprintf(page, "%d (%s)\n", speed_min(mddev),
3668 mddev->sync_speed_min ? "local": "system");
3672 sync_min_store(mddev_t *mddev, const char *buf, size_t len)
3676 if (strncmp(buf, "system", 6)==0) {
3677 mddev->sync_speed_min = 0;
3680 min = simple_strtoul(buf, &e, 10);
3681 if (buf == e || (*e && *e != '\n') || min <= 0)
3683 mddev->sync_speed_min = min;
3687 static struct md_sysfs_entry md_sync_min =
3688 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
3691 sync_max_show(mddev_t *mddev, char *page)
3693 return sprintf(page, "%d (%s)\n", speed_max(mddev),
3694 mddev->sync_speed_max ? "local": "system");
3698 sync_max_store(mddev_t *mddev, const char *buf, size_t len)
3702 if (strncmp(buf, "system", 6)==0) {
3703 mddev->sync_speed_max = 0;
3706 max = simple_strtoul(buf, &e, 10);
3707 if (buf == e || (*e && *e != '\n') || max <= 0)
3709 mddev->sync_speed_max = max;
3713 static struct md_sysfs_entry md_sync_max =
3714 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
3717 degraded_show(mddev_t *mddev, char *page)
3719 return sprintf(page, "%d\n", mddev->degraded);
3721 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
3724 sync_force_parallel_show(mddev_t *mddev, char *page)
3726 return sprintf(page, "%d\n", mddev->parallel_resync);
3730 sync_force_parallel_store(mddev_t *mddev, const char *buf, size_t len)
3734 if (strict_strtol(buf, 10, &n))
3737 if (n != 0 && n != 1)
3740 mddev->parallel_resync = n;
3742 if (mddev->sync_thread)
3743 wake_up(&resync_wait);
3748 /* force parallel resync, even with shared block devices */
3749 static struct md_sysfs_entry md_sync_force_parallel =
3750 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
3751 sync_force_parallel_show, sync_force_parallel_store);
3754 sync_speed_show(mddev_t *mddev, char *page)
3756 unsigned long resync, dt, db;
3757 if (mddev->curr_resync == 0)
3758 return sprintf(page, "none\n");
3759 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
3760 dt = (jiffies - mddev->resync_mark) / HZ;
3762 db = resync - mddev->resync_mark_cnt;
3763 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
3766 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
3769 sync_completed_show(mddev_t *mddev, char *page)
3771 unsigned long max_sectors, resync;
3773 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3774 return sprintf(page, "none\n");
3776 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
3777 max_sectors = mddev->resync_max_sectors;
3779 max_sectors = mddev->dev_sectors;
3781 resync = mddev->curr_resync_completed;
3782 return sprintf(page, "%lu / %lu\n", resync, max_sectors);
3785 static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed);
3788 min_sync_show(mddev_t *mddev, char *page)
3790 return sprintf(page, "%llu\n",
3791 (unsigned long long)mddev->resync_min);
3794 min_sync_store(mddev_t *mddev, const char *buf, size_t len)
3796 unsigned long long min;
3797 if (strict_strtoull(buf, 10, &min))
3799 if (min > mddev->resync_max)
3801 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3804 /* Must be a multiple of chunk_size */
3805 if (mddev->chunk_sectors) {
3806 sector_t temp = min;
3807 if (sector_div(temp, mddev->chunk_sectors))
3810 mddev->resync_min = min;
3815 static struct md_sysfs_entry md_min_sync =
3816 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
3819 max_sync_show(mddev_t *mddev, char *page)
3821 if (mddev->resync_max == MaxSector)
3822 return sprintf(page, "max\n");
3824 return sprintf(page, "%llu\n",
3825 (unsigned long long)mddev->resync_max);
3828 max_sync_store(mddev_t *mddev, const char *buf, size_t len)
3830 if (strncmp(buf, "max", 3) == 0)
3831 mddev->resync_max = MaxSector;
3833 unsigned long long max;
3834 if (strict_strtoull(buf, 10, &max))
3836 if (max < mddev->resync_min)
3838 if (max < mddev->resync_max &&
3840 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3843 /* Must be a multiple of chunk_size */
3844 if (mddev->chunk_sectors) {
3845 sector_t temp = max;
3846 if (sector_div(temp, mddev->chunk_sectors))
3849 mddev->resync_max = max;
3851 wake_up(&mddev->recovery_wait);
3855 static struct md_sysfs_entry md_max_sync =
3856 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
3859 suspend_lo_show(mddev_t *mddev, char *page)
3861 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
3865 suspend_lo_store(mddev_t *mddev, const char *buf, size_t len)
3868 unsigned long long new = simple_strtoull(buf, &e, 10);
3870 if (mddev->pers == NULL ||
3871 mddev->pers->quiesce == NULL)
3873 if (buf == e || (*e && *e != '\n'))
3875 if (new >= mddev->suspend_hi ||
3876 (new > mddev->suspend_lo && new < mddev->suspend_hi)) {
3877 mddev->suspend_lo = new;
3878 mddev->pers->quiesce(mddev, 2);
3883 static struct md_sysfs_entry md_suspend_lo =
3884 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
3888 suspend_hi_show(mddev_t *mddev, char *page)
3890 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
3894 suspend_hi_store(mddev_t *mddev, const char *buf, size_t len)
3897 unsigned long long new = simple_strtoull(buf, &e, 10);
3899 if (mddev->pers == NULL ||
3900 mddev->pers->quiesce == NULL)
3902 if (buf == e || (*e && *e != '\n'))
3904 if ((new <= mddev->suspend_lo && mddev->suspend_lo >= mddev->suspend_hi) ||
3905 (new > mddev->suspend_lo && new > mddev->suspend_hi)) {
3906 mddev->suspend_hi = new;
3907 mddev->pers->quiesce(mddev, 1);
3908 mddev->pers->quiesce(mddev, 0);
3913 static struct md_sysfs_entry md_suspend_hi =
3914 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
3917 reshape_position_show(mddev_t *mddev, char *page)
3919 if (mddev->reshape_position != MaxSector)
3920 return sprintf(page, "%llu\n",
3921 (unsigned long long)mddev->reshape_position);
3922 strcpy(page, "none\n");
3927 reshape_position_store(mddev_t *mddev, const char *buf, size_t len)
3930 unsigned long long new = simple_strtoull(buf, &e, 10);
3933 if (buf == e || (*e && *e != '\n'))
3935 mddev->reshape_position = new;
3936 mddev->delta_disks = 0;
3937 mddev->new_level = mddev->level;
3938 mddev->new_layout = mddev->layout;
3939 mddev->new_chunk_sectors = mddev->chunk_sectors;
3943 static struct md_sysfs_entry md_reshape_position =
3944 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
3945 reshape_position_store);
3948 array_size_show(mddev_t *mddev, char *page)
3950 if (mddev->external_size)
3951 return sprintf(page, "%llu\n",
3952 (unsigned long long)mddev->array_sectors/2);
3954 return sprintf(page, "default\n");
3958 array_size_store(mddev_t *mddev, const char *buf, size_t len)
3962 if (strncmp(buf, "default", 7) == 0) {
3964 sectors = mddev->pers->size(mddev, 0, 0);
3966 sectors = mddev->array_sectors;
3968 mddev->external_size = 0;
3970 if (strict_blocks_to_sectors(buf, §ors) < 0)
3972 if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors)
3975 mddev->external_size = 1;
3978 mddev->array_sectors = sectors;
3979 set_capacity(mddev->gendisk, mddev->array_sectors);
3981 revalidate_disk(mddev->gendisk);
3986 static struct md_sysfs_entry md_array_size =
3987 __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show,
3990 static struct attribute *md_default_attrs[] = {
3993 &md_raid_disks.attr,
3994 &md_chunk_size.attr,
3996 &md_resync_start.attr,
3998 &md_new_device.attr,
3999 &md_safe_delay.attr,
4000 &md_array_state.attr,
4001 &md_reshape_position.attr,
4002 &md_array_size.attr,
4003 &max_corr_read_errors.attr,
4007 static struct attribute *md_redundancy_attrs[] = {
4009 &md_mismatches.attr,
4012 &md_sync_speed.attr,
4013 &md_sync_force_parallel.attr,
4014 &md_sync_completed.attr,
4017 &md_suspend_lo.attr,
4018 &md_suspend_hi.attr,
4023 static struct attribute_group md_redundancy_group = {
4025 .attrs = md_redundancy_attrs,
4030 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
4032 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
4033 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
4038 rv = mddev_lock(mddev);
4040 rv = entry->show(mddev, page);
4041 mddev_unlock(mddev);
4047 md_attr_store(struct kobject *kobj, struct attribute *attr,
4048 const char *page, size_t length)
4050 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
4051 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
4056 if (!capable(CAP_SYS_ADMIN))
4058 rv = mddev_lock(mddev);
4059 if (mddev->hold_active == UNTIL_IOCTL)
4060 mddev->hold_active = 0;
4062 rv = entry->store(mddev, page, length);
4063 mddev_unlock(mddev);
4068 static void md_free(struct kobject *ko)
4070 mddev_t *mddev = container_of(ko, mddev_t, kobj);
4072 if (mddev->sysfs_state)
4073 sysfs_put(mddev->sysfs_state);
4075 if (mddev->gendisk) {
4076 del_gendisk(mddev->gendisk);
4077 put_disk(mddev->gendisk);
4080 blk_cleanup_queue(mddev->queue);
4085 static struct sysfs_ops md_sysfs_ops = {
4086 .show = md_attr_show,
4087 .store = md_attr_store,
4089 static struct kobj_type md_ktype = {
4091 .sysfs_ops = &md_sysfs_ops,
4092 .default_attrs = md_default_attrs,
4097 static void mddev_delayed_delete(struct work_struct *ws)
4099 mddev_t *mddev = container_of(ws, mddev_t, del_work);
4101 sysfs_remove_group(&mddev->kobj, &md_bitmap_group);
4102 kobject_del(&mddev->kobj);
4103 kobject_put(&mddev->kobj);
4106 static int md_alloc(dev_t dev, char *name)
4108 static DEFINE_MUTEX(disks_mutex);
4109 mddev_t *mddev = mddev_find(dev);
4110 struct gendisk *disk;
4119 partitioned = (MAJOR(mddev->unit) != MD_MAJOR);
4120 shift = partitioned ? MdpMinorShift : 0;
4121 unit = MINOR(mddev->unit) >> shift;
4123 /* wait for any previous instance if this device
4124 * to be completed removed (mddev_delayed_delete).
4126 flush_scheduled_work();
4128 mutex_lock(&disks_mutex);
4134 /* Need to ensure that 'name' is not a duplicate.
4137 spin_lock(&all_mddevs_lock);
4139 list_for_each_entry(mddev2, &all_mddevs, all_mddevs)
4140 if (mddev2->gendisk &&
4141 strcmp(mddev2->gendisk->disk_name, name) == 0) {
4142 spin_unlock(&all_mddevs_lock);
4145 spin_unlock(&all_mddevs_lock);
4149 mddev->queue = blk_alloc_queue(GFP_KERNEL);
4152 mddev->queue->queuedata = mddev;
4154 /* Can be unlocked because the queue is new: no concurrency */
4155 queue_flag_set_unlocked(QUEUE_FLAG_CLUSTER, mddev->queue);
4157 blk_queue_make_request(mddev->queue, md_make_request);
4159 disk = alloc_disk(1 << shift);
4161 blk_cleanup_queue(mddev->queue);
4162 mddev->queue = NULL;
4165 disk->major = MAJOR(mddev->unit);
4166 disk->first_minor = unit << shift;
4168 strcpy(disk->disk_name, name);
4169 else if (partitioned)
4170 sprintf(disk->disk_name, "md_d%d", unit);
4172 sprintf(disk->disk_name, "md%d", unit);
4173 disk->fops = &md_fops;
4174 disk->private_data = mddev;
4175 disk->queue = mddev->queue;
4176 /* Allow extended partitions. This makes the
4177 * 'mdp' device redundant, but we can't really
4180 disk->flags |= GENHD_FL_EXT_DEVT;
4182 mddev->gendisk = disk;
4183 error = kobject_init_and_add(&mddev->kobj, &md_ktype,
4184 &disk_to_dev(disk)->kobj, "%s", "md");
4186 /* This isn't possible, but as kobject_init_and_add is marked
4187 * __must_check, we must do something with the result
4189 printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
4193 if (sysfs_create_group(&mddev->kobj, &md_bitmap_group))
4194 printk(KERN_DEBUG "pointless warning\n");
4196 mutex_unlock(&disks_mutex);
4198 kobject_uevent(&mddev->kobj, KOBJ_ADD);
4199 mddev->sysfs_state = sysfs_get_dirent(mddev->kobj.sd, "array_state");
4205 static struct kobject *md_probe(dev_t dev, int *part, void *data)
4207 md_alloc(dev, NULL);
4211 static int add_named_array(const char *val, struct kernel_param *kp)
4213 /* val must be "md_*" where * is not all digits.
4214 * We allocate an array with a large free minor number, and
4215 * set the name to val. val must not already be an active name.
4217 int len = strlen(val);
4218 char buf[DISK_NAME_LEN];
4220 while (len && val[len-1] == '\n')
4222 if (len >= DISK_NAME_LEN)
4224 strlcpy(buf, val, len+1);
4225 if (strncmp(buf, "md_", 3) != 0)
4227 return md_alloc(0, buf);
4230 static void md_safemode_timeout(unsigned long data)
4232 mddev_t *mddev = (mddev_t *) data;
4234 if (!atomic_read(&mddev->writes_pending)) {
4235 mddev->safemode = 1;
4236 if (mddev->external)
4237 sysfs_notify_dirent(mddev->sysfs_state);
4239 md_wakeup_thread(mddev->thread);
4242 static int start_dirty_degraded;
4244 static int do_md_run(mddev_t * mddev)
4248 struct gendisk *disk;
4249 struct mdk_personality *pers;
4251 if (list_empty(&mddev->disks))
4252 /* cannot run an array with no devices.. */
4258 /* These two calls synchronise us with the
4259 * sysfs_remove_group calls in mddev_unlock,
4260 * so they must have completed.
4262 mutex_lock(&mddev->open_mutex);
4263 mutex_unlock(&mddev->open_mutex);
4266 * Analyze all RAID superblock(s)
4268 if (!mddev->raid_disks) {
4269 if (!mddev->persistent)
4274 if (mddev->level != LEVEL_NONE)
4275 request_module("md-level-%d", mddev->level);
4276 else if (mddev->clevel[0])
4277 request_module("md-%s", mddev->clevel);
4280 * Drop all container device buffers, from now on
4281 * the only valid external interface is through the md
4284 list_for_each_entry(rdev, &mddev->disks, same_set) {
4285 if (test_bit(Faulty, &rdev->flags))
4287 sync_blockdev(rdev->bdev);
4288 invalidate_bdev(rdev->bdev);
4290 /* perform some consistency tests on the device.
4291 * We don't want the data to overlap the metadata,
4292 * Internal Bitmap issues have been handled elsewhere.
4294 if (rdev->data_offset < rdev->sb_start) {
4295 if (mddev->dev_sectors &&
4296 rdev->data_offset + mddev->dev_sectors
4298 printk("md: %s: data overlaps metadata\n",
4303 if (rdev->sb_start + rdev->sb_size/512
4304 > rdev->data_offset) {
4305 printk("md: %s: metadata overlaps data\n",
4310 sysfs_notify_dirent(rdev->sysfs_state);
4313 disk = mddev->gendisk;
4315 spin_lock(&pers_lock);
4316 pers = find_pers(mddev->level, mddev->clevel);
4317 if (!pers || !try_module_get(pers->owner)) {
4318 spin_unlock(&pers_lock);
4319 if (mddev->level != LEVEL_NONE)
4320 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
4323 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
4328 spin_unlock(&pers_lock);
4329 if (mddev->level != pers->level) {
4330 mddev->level = pers->level;
4331 mddev->new_level = pers->level;
4333 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
4335 if (mddev->reshape_position != MaxSector &&
4336 pers->start_reshape == NULL) {
4337 /* This personality cannot handle reshaping... */
4339 module_put(pers->owner);
4343 if (pers->sync_request) {
4344 /* Warn if this is a potentially silly
4347 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
4351 list_for_each_entry(rdev, &mddev->disks, same_set)
4352 list_for_each_entry(rdev2, &mddev->disks, same_set) {
4354 rdev->bdev->bd_contains ==
4355 rdev2->bdev->bd_contains) {
4357 "%s: WARNING: %s appears to be"
4358 " on the same physical disk as"
4361 bdevname(rdev->bdev,b),
4362 bdevname(rdev2->bdev,b2));
4369 "True protection against single-disk"
4370 " failure might be compromised.\n");
4373 mddev->recovery = 0;
4374 /* may be over-ridden by personality */
4375 mddev->resync_max_sectors = mddev->dev_sectors;
4377 mddev->barriers_work = 1;
4378 mddev->ok_start_degraded = start_dirty_degraded;
4380 if (start_readonly && mddev->ro == 0)
4381 mddev->ro = 2; /* read-only, but switch on first write */
4383 err = mddev->pers->run(mddev);
4385 printk(KERN_ERR "md: pers->run() failed ...\n");
4386 else if (mddev->pers->size(mddev, 0, 0) < mddev->array_sectors) {
4387 WARN_ONCE(!mddev->external_size, "%s: default size too small,"
4388 " but 'external_size' not in effect?\n", __func__);
4390 "md: invalid array_size %llu > default size %llu\n",
4391 (unsigned long long)mddev->array_sectors / 2,
4392 (unsigned long long)mddev->pers->size(mddev, 0, 0) / 2);
4394 mddev->pers->stop(mddev);
4396 if (err == 0 && mddev->pers->sync_request) {
4397 err = bitmap_create(mddev);
4399 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
4400 mdname(mddev), err);
4401 mddev->pers->stop(mddev);
4405 module_put(mddev->pers->owner);
4407 bitmap_destroy(mddev);
4410 if (mddev->pers->sync_request) {
4411 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
4413 "md: cannot register extra attributes for %s\n",
4415 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action");
4416 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
4419 atomic_set(&mddev->writes_pending,0);
4420 atomic_set(&mddev->max_corr_read_errors,
4421 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS);
4422 mddev->safemode = 0;
4423 mddev->safemode_timer.function = md_safemode_timeout;
4424 mddev->safemode_timer.data = (unsigned long) mddev;
4425 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
4428 list_for_each_entry(rdev, &mddev->disks, same_set)
4429 if (rdev->raid_disk >= 0) {
4431 sprintf(nm, "rd%d", rdev->raid_disk);
4432 if (sysfs_create_link(&mddev->kobj, &rdev->kobj, nm))
4433 printk("md: cannot register %s for %s\n",
4437 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4440 md_update_sb(mddev, 0);
4442 set_capacity(disk, mddev->array_sectors);
4444 md_wakeup_thread(mddev->thread);
4445 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
4447 revalidate_disk(mddev->gendisk);
4449 md_new_event(mddev);
4450 sysfs_notify_dirent(mddev->sysfs_state);
4451 if (mddev->sysfs_action)
4452 sysfs_notify_dirent(mddev->sysfs_action);
4453 sysfs_notify(&mddev->kobj, NULL, "degraded");
4454 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
4458 static int restart_array(mddev_t *mddev)
4460 struct gendisk *disk = mddev->gendisk;
4462 /* Complain if it has no devices */
4463 if (list_empty(&mddev->disks))
4469 mddev->safemode = 0;
4471 set_disk_ro(disk, 0);
4472 printk(KERN_INFO "md: %s switched to read-write mode.\n",
4474 /* Kick recovery or resync if necessary */
4475 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4476 md_wakeup_thread(mddev->thread);
4477 md_wakeup_thread(mddev->sync_thread);
4478 sysfs_notify_dirent(mddev->sysfs_state);
4482 /* similar to deny_write_access, but accounts for our holding a reference
4483 * to the file ourselves */
4484 static int deny_bitmap_write_access(struct file * file)
4486 struct inode *inode = file->f_mapping->host;
4488 spin_lock(&inode->i_lock);
4489 if (atomic_read(&inode->i_writecount) > 1) {
4490 spin_unlock(&inode->i_lock);
4493 atomic_set(&inode->i_writecount, -1);
4494 spin_unlock(&inode->i_lock);
4499 void restore_bitmap_write_access(struct file *file)
4501 struct inode *inode = file->f_mapping->host;
4503 spin_lock(&inode->i_lock);
4504 atomic_set(&inode->i_writecount, 1);
4505 spin_unlock(&inode->i_lock);
4509 * 0 - completely stop and dis-assemble array
4510 * 1 - switch to readonly
4511 * 2 - stop but do not disassemble array
4513 static int do_md_stop(mddev_t * mddev, int mode, int is_open)
4516 struct gendisk *disk = mddev->gendisk;
4519 mutex_lock(&mddev->open_mutex);
4520 if (atomic_read(&mddev->openers) > is_open) {
4521 printk("md: %s still in use.\n",mdname(mddev));
4523 } else if (mddev->pers) {
4525 if (mddev->sync_thread) {
4526 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4527 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4528 md_unregister_thread(mddev->sync_thread);
4529 mddev->sync_thread = NULL;
4532 del_timer_sync(&mddev->safemode_timer);
4535 case 1: /* readonly */
4541 case 0: /* disassemble */
4543 bitmap_flush(mddev);
4544 md_super_wait(mddev);
4546 set_disk_ro(disk, 0);
4548 mddev->pers->stop(mddev);
4549 mddev->queue->merge_bvec_fn = NULL;
4550 mddev->queue->unplug_fn = NULL;
4551 mddev->queue->backing_dev_info.congested_fn = NULL;
4552 module_put(mddev->pers->owner);
4553 if (mddev->pers->sync_request && mddev->private == NULL)
4554 mddev->private = (void*)1;
4556 /* tell userspace to handle 'inactive' */
4557 sysfs_notify_dirent(mddev->sysfs_state);
4559 list_for_each_entry(rdev, &mddev->disks, same_set)
4560 if (rdev->raid_disk >= 0) {
4562 sprintf(nm, "rd%d", rdev->raid_disk);
4563 sysfs_remove_link(&mddev->kobj, nm);
4566 set_capacity(disk, 0);
4572 if (!mddev->in_sync || mddev->flags) {
4573 /* mark array as shutdown cleanly */
4575 md_update_sb(mddev, 1);
4578 set_disk_ro(disk, 1);
4579 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4583 mutex_unlock(&mddev->open_mutex);
4587 * Free resources if final stop
4591 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
4593 bitmap_destroy(mddev);
4594 if (mddev->bitmap_info.file) {
4595 restore_bitmap_write_access(mddev->bitmap_info.file);
4596 fput(mddev->bitmap_info.file);
4597 mddev->bitmap_info.file = NULL;
4599 mddev->bitmap_info.offset = 0;
4601 export_array(mddev);
4603 mddev->array_sectors = 0;
4604 mddev->external_size = 0;
4605 mddev->dev_sectors = 0;
4606 mddev->raid_disks = 0;
4607 mddev->recovery_cp = 0;
4608 mddev->resync_min = 0;
4609 mddev->resync_max = MaxSector;
4610 mddev->reshape_position = MaxSector;
4611 mddev->external = 0;
4612 mddev->persistent = 0;
4613 mddev->level = LEVEL_NONE;
4614 mddev->clevel[0] = 0;
4617 mddev->metadata_type[0] = 0;
4618 mddev->chunk_sectors = 0;
4619 mddev->ctime = mddev->utime = 0;
4621 mddev->max_disks = 0;
4623 mddev->delta_disks = 0;
4624 mddev->new_level = LEVEL_NONE;
4625 mddev->new_layout = 0;
4626 mddev->new_chunk_sectors = 0;
4627 mddev->curr_resync = 0;
4628 mddev->resync_mismatches = 0;
4629 mddev->suspend_lo = mddev->suspend_hi = 0;
4630 mddev->sync_speed_min = mddev->sync_speed_max = 0;
4631 mddev->recovery = 0;
4634 mddev->degraded = 0;
4635 mddev->barriers_work = 0;
4636 mddev->safemode = 0;
4637 mddev->bitmap_info.offset = 0;
4638 mddev->bitmap_info.default_offset = 0;
4639 mddev->bitmap_info.chunksize = 0;
4640 mddev->bitmap_info.daemon_sleep = 0;
4641 mddev->bitmap_info.max_write_behind = 0;
4642 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
4643 if (mddev->hold_active == UNTIL_STOP)
4644 mddev->hold_active = 0;
4646 } else if (mddev->pers)
4647 printk(KERN_INFO "md: %s switched to read-only mode.\n",
4650 blk_integrity_unregister(disk);
4651 md_new_event(mddev);
4652 sysfs_notify_dirent(mddev->sysfs_state);
4657 static void autorun_array(mddev_t *mddev)
4662 if (list_empty(&mddev->disks))
4665 printk(KERN_INFO "md: running: ");
4667 list_for_each_entry(rdev, &mddev->disks, same_set) {
4668 char b[BDEVNAME_SIZE];
4669 printk("<%s>", bdevname(rdev->bdev,b));
4673 err = do_md_run(mddev);
4675 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
4676 do_md_stop(mddev, 0, 0);
4681 * lets try to run arrays based on all disks that have arrived
4682 * until now. (those are in pending_raid_disks)
4684 * the method: pick the first pending disk, collect all disks with
4685 * the same UUID, remove all from the pending list and put them into
4686 * the 'same_array' list. Then order this list based on superblock
4687 * update time (freshest comes first), kick out 'old' disks and
4688 * compare superblocks. If everything's fine then run it.
4690 * If "unit" is allocated, then bump its reference count
4692 static void autorun_devices(int part)
4694 mdk_rdev_t *rdev0, *rdev, *tmp;
4696 char b[BDEVNAME_SIZE];
4698 printk(KERN_INFO "md: autorun ...\n");
4699 while (!list_empty(&pending_raid_disks)) {
4702 LIST_HEAD(candidates);
4703 rdev0 = list_entry(pending_raid_disks.next,
4704 mdk_rdev_t, same_set);
4706 printk(KERN_INFO "md: considering %s ...\n",
4707 bdevname(rdev0->bdev,b));
4708 INIT_LIST_HEAD(&candidates);
4709 rdev_for_each_list(rdev, tmp, &pending_raid_disks)
4710 if (super_90_load(rdev, rdev0, 0) >= 0) {
4711 printk(KERN_INFO "md: adding %s ...\n",
4712 bdevname(rdev->bdev,b));
4713 list_move(&rdev->same_set, &candidates);
4716 * now we have a set of devices, with all of them having
4717 * mostly sane superblocks. It's time to allocate the
4721 dev = MKDEV(mdp_major,
4722 rdev0->preferred_minor << MdpMinorShift);
4723 unit = MINOR(dev) >> MdpMinorShift;
4725 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
4728 if (rdev0->preferred_minor != unit) {
4729 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
4730 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
4734 md_probe(dev, NULL, NULL);
4735 mddev = mddev_find(dev);
4736 if (!mddev || !mddev->gendisk) {
4740 "md: cannot allocate memory for md drive.\n");
4743 if (mddev_lock(mddev))
4744 printk(KERN_WARNING "md: %s locked, cannot run\n",
4746 else if (mddev->raid_disks || mddev->major_version
4747 || !list_empty(&mddev->disks)) {
4749 "md: %s already running, cannot run %s\n",
4750 mdname(mddev), bdevname(rdev0->bdev,b));
4751 mddev_unlock(mddev);
4753 printk(KERN_INFO "md: created %s\n", mdname(mddev));
4754 mddev->persistent = 1;
4755 rdev_for_each_list(rdev, tmp, &candidates) {
4756 list_del_init(&rdev->same_set);
4757 if (bind_rdev_to_array(rdev, mddev))
4760 autorun_array(mddev);
4761 mddev_unlock(mddev);
4763 /* on success, candidates will be empty, on error
4766 rdev_for_each_list(rdev, tmp, &candidates) {
4767 list_del_init(&rdev->same_set);
4772 printk(KERN_INFO "md: ... autorun DONE.\n");
4774 #endif /* !MODULE */
4776 static int get_version(void __user * arg)
4780 ver.major = MD_MAJOR_VERSION;
4781 ver.minor = MD_MINOR_VERSION;
4782 ver.patchlevel = MD_PATCHLEVEL_VERSION;
4784 if (copy_to_user(arg, &ver, sizeof(ver)))
4790 static int get_array_info(mddev_t * mddev, void __user * arg)
4792 mdu_array_info_t info;
4793 int nr,working,insync,failed,spare;
4796 nr=working=insync=failed=spare=0;
4797 list_for_each_entry(rdev, &mddev->disks, same_set) {
4799 if (test_bit(Faulty, &rdev->flags))
4803 if (test_bit(In_sync, &rdev->flags))
4810 info.major_version = mddev->major_version;
4811 info.minor_version = mddev->minor_version;
4812 info.patch_version = MD_PATCHLEVEL_VERSION;
4813 info.ctime = mddev->ctime;
4814 info.level = mddev->level;
4815 info.size = mddev->dev_sectors / 2;
4816 if (info.size != mddev->dev_sectors / 2) /* overflow */
4819 info.raid_disks = mddev->raid_disks;
4820 info.md_minor = mddev->md_minor;
4821 info.not_persistent= !mddev->persistent;
4823 info.utime = mddev->utime;
4826 info.state = (1<<MD_SB_CLEAN);
4827 if (mddev->bitmap && mddev->bitmap_info.offset)
4828 info.state = (1<<MD_SB_BITMAP_PRESENT);
4829 info.active_disks = insync;
4830 info.working_disks = working;
4831 info.failed_disks = failed;
4832 info.spare_disks = spare;
4834 info.layout = mddev->layout;
4835 info.chunk_size = mddev->chunk_sectors << 9;
4837 if (copy_to_user(arg, &info, sizeof(info)))
4843 static int get_bitmap_file(mddev_t * mddev, void __user * arg)
4845 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
4846 char *ptr, *buf = NULL;
4849 if (md_allow_write(mddev))
4850 file = kmalloc(sizeof(*file), GFP_NOIO);
4852 file = kmalloc(sizeof(*file), GFP_KERNEL);
4857 /* bitmap disabled, zero the first byte and copy out */
4858 if (!mddev->bitmap || !mddev->bitmap->file) {
4859 file->pathname[0] = '\0';
4863 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
4867 ptr = d_path(&mddev->bitmap->file->f_path, buf, sizeof(file->pathname));
4871 strcpy(file->pathname, ptr);
4875 if (copy_to_user(arg, file, sizeof(*file)))
4883 static int get_disk_info(mddev_t * mddev, void __user * arg)
4885 mdu_disk_info_t info;
4888 if (copy_from_user(&info, arg, sizeof(info)))
4891 rdev = find_rdev_nr(mddev, info.number);
4893 info.major = MAJOR(rdev->bdev->bd_dev);
4894 info.minor = MINOR(rdev->bdev->bd_dev);
4895 info.raid_disk = rdev->raid_disk;
4897 if (test_bit(Faulty, &rdev->flags))
4898 info.state |= (1<<MD_DISK_FAULTY);
4899 else if (test_bit(In_sync, &rdev->flags)) {
4900 info.state |= (1<<MD_DISK_ACTIVE);
4901 info.state |= (1<<MD_DISK_SYNC);
4903 if (test_bit(WriteMostly, &rdev->flags))
4904 info.state |= (1<<MD_DISK_WRITEMOSTLY);
4906 info.major = info.minor = 0;
4907 info.raid_disk = -1;
4908 info.state = (1<<MD_DISK_REMOVED);
4911 if (copy_to_user(arg, &info, sizeof(info)))
4917 static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
4919 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
4921 dev_t dev = MKDEV(info->major,info->minor);
4923 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
4926 if (!mddev->raid_disks) {
4928 /* expecting a device which has a superblock */
4929 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
4932 "md: md_import_device returned %ld\n",
4934 return PTR_ERR(rdev);
4936 if (!list_empty(&mddev->disks)) {
4937 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
4938 mdk_rdev_t, same_set);
4939 err = super_types[mddev->major_version]
4940 .load_super(rdev, rdev0, mddev->minor_version);
4943 "md: %s has different UUID to %s\n",
4944 bdevname(rdev->bdev,b),
4945 bdevname(rdev0->bdev,b2));
4950 err = bind_rdev_to_array(rdev, mddev);
4957 * add_new_disk can be used once the array is assembled
4958 * to add "hot spares". They must already have a superblock
4963 if (!mddev->pers->hot_add_disk) {
4965 "%s: personality does not support diskops!\n",
4969 if (mddev->persistent)
4970 rdev = md_import_device(dev, mddev->major_version,
4971 mddev->minor_version);
4973 rdev = md_import_device(dev, -1, -1);
4976 "md: md_import_device returned %ld\n",
4978 return PTR_ERR(rdev);
4980 /* set save_raid_disk if appropriate */
4981 if (!mddev->persistent) {
4982 if (info->state & (1<<MD_DISK_SYNC) &&
4983 info->raid_disk < mddev->raid_disks)
4984 rdev->raid_disk = info->raid_disk;
4986 rdev->raid_disk = -1;
4988 super_types[mddev->major_version].
4989 validate_super(mddev, rdev);
4990 rdev->saved_raid_disk = rdev->raid_disk;
4992 clear_bit(In_sync, &rdev->flags); /* just to be sure */
4993 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
4994 set_bit(WriteMostly, &rdev->flags);
4996 clear_bit(WriteMostly, &rdev->flags);
4998 rdev->raid_disk = -1;
4999 err = bind_rdev_to_array(rdev, mddev);
5000 if (!err && !mddev->pers->hot_remove_disk) {
5001 /* If there is hot_add_disk but no hot_remove_disk
5002 * then added disks for geometry changes,
5003 * and should be added immediately.
5005 super_types[mddev->major_version].
5006 validate_super(mddev, rdev);
5007 err = mddev->pers->hot_add_disk(mddev, rdev);
5009 unbind_rdev_from_array(rdev);
5014 sysfs_notify_dirent(rdev->sysfs_state);
5016 md_update_sb(mddev, 1);
5017 if (mddev->degraded)
5018 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
5019 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5020 md_wakeup_thread(mddev->thread);
5024 /* otherwise, add_new_disk is only allowed
5025 * for major_version==0 superblocks
5027 if (mddev->major_version != 0) {
5028 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
5033 if (!(info->state & (1<<MD_DISK_FAULTY))) {
5035 rdev = md_import_device(dev, -1, 0);
5038 "md: error, md_import_device() returned %ld\n",
5040 return PTR_ERR(rdev);
5042 rdev->desc_nr = info->number;
5043 if (info->raid_disk < mddev->raid_disks)
5044 rdev->raid_disk = info->raid_disk;
5046 rdev->raid_disk = -1;
5048 if (rdev->raid_disk < mddev->raid_disks)
5049 if (info->state & (1<<MD_DISK_SYNC))
5050 set_bit(In_sync, &rdev->flags);
5052 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
5053 set_bit(WriteMostly, &rdev->flags);
5055 if (!mddev->persistent) {
5056 printk(KERN_INFO "md: nonpersistent superblock ...\n");
5057 rdev->sb_start = rdev->bdev->bd_inode->i_size / 512;
5059 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
5060 rdev->sectors = rdev->sb_start;
5062 err = bind_rdev_to_array(rdev, mddev);
5072 static int hot_remove_disk(mddev_t * mddev, dev_t dev)
5074 char b[BDEVNAME_SIZE];
5077 rdev = find_rdev(mddev, dev);
5081 if (rdev->raid_disk >= 0)
5084 kick_rdev_from_array(rdev);
5085 md_update_sb(mddev, 1);
5086 md_new_event(mddev);
5090 printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n",
5091 bdevname(rdev->bdev,b), mdname(mddev));
5095 static int hot_add_disk(mddev_t * mddev, dev_t dev)
5097 char b[BDEVNAME_SIZE];
5104 if (mddev->major_version != 0) {
5105 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
5106 " version-0 superblocks.\n",
5110 if (!mddev->pers->hot_add_disk) {
5112 "%s: personality does not support diskops!\n",
5117 rdev = md_import_device(dev, -1, 0);
5120 "md: error, md_import_device() returned %ld\n",
5125 if (mddev->persistent)
5126 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
5128 rdev->sb_start = rdev->bdev->bd_inode->i_size / 512;
5130 rdev->sectors = rdev->sb_start;
5132 if (test_bit(Faulty, &rdev->flags)) {
5134 "md: can not hot-add faulty %s disk to %s!\n",
5135 bdevname(rdev->bdev,b), mdname(mddev));
5139 clear_bit(In_sync, &rdev->flags);
5141 rdev->saved_raid_disk = -1;
5142 err = bind_rdev_to_array(rdev, mddev);
5147 * The rest should better be atomic, we can have disk failures
5148 * noticed in interrupt contexts ...
5151 rdev->raid_disk = -1;
5153 md_update_sb(mddev, 1);
5156 * Kick recovery, maybe this spare has to be added to the
5157 * array immediately.
5159 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5160 md_wakeup_thread(mddev->thread);
5161 md_new_event(mddev);
5169 static int set_bitmap_file(mddev_t *mddev, int fd)
5174 if (!mddev->pers->quiesce)
5176 if (mddev->recovery || mddev->sync_thread)
5178 /* we should be able to change the bitmap.. */
5184 return -EEXIST; /* cannot add when bitmap is present */
5185 mddev->bitmap_info.file = fget(fd);
5187 if (mddev->bitmap_info.file == NULL) {
5188 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
5193 err = deny_bitmap_write_access(mddev->bitmap_info.file);
5195 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
5197 fput(mddev->bitmap_info.file);
5198 mddev->bitmap_info.file = NULL;
5201 mddev->bitmap_info.offset = 0; /* file overrides offset */
5202 } else if (mddev->bitmap == NULL)
5203 return -ENOENT; /* cannot remove what isn't there */
5206 mddev->pers->quiesce(mddev, 1);
5208 err = bitmap_create(mddev);
5209 if (fd < 0 || err) {
5210 bitmap_destroy(mddev);
5211 fd = -1; /* make sure to put the file */
5213 mddev->pers->quiesce(mddev, 0);
5216 if (mddev->bitmap_info.file) {
5217 restore_bitmap_write_access(mddev->bitmap_info.file);
5218 fput(mddev->bitmap_info.file);
5220 mddev->bitmap_info.file = NULL;
5227 * set_array_info is used two different ways
5228 * The original usage is when creating a new array.
5229 * In this usage, raid_disks is > 0 and it together with
5230 * level, size, not_persistent,layout,chunksize determine the
5231 * shape of the array.
5232 * This will always create an array with a type-0.90.0 superblock.
5233 * The newer usage is when assembling an array.
5234 * In this case raid_disks will be 0, and the major_version field is
5235 * use to determine which style super-blocks are to be found on the devices.
5236 * The minor and patch _version numbers are also kept incase the
5237 * super_block handler wishes to interpret them.
5239 static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
5242 if (info->raid_disks == 0) {
5243 /* just setting version number for superblock loading */
5244 if (info->major_version < 0 ||
5245 info->major_version >= ARRAY_SIZE(super_types) ||
5246 super_types[info->major_version].name == NULL) {
5247 /* maybe try to auto-load a module? */
5249 "md: superblock version %d not known\n",
5250 info->major_version);
5253 mddev->major_version = info->major_version;
5254 mddev->minor_version = info->minor_version;
5255 mddev->patch_version = info->patch_version;
5256 mddev->persistent = !info->not_persistent;
5257 /* ensure mddev_put doesn't delete this now that there
5258 * is some minimal configuration.
5260 mddev->ctime = get_seconds();
5263 mddev->major_version = MD_MAJOR_VERSION;
5264 mddev->minor_version = MD_MINOR_VERSION;
5265 mddev->patch_version = MD_PATCHLEVEL_VERSION;
5266 mddev->ctime = get_seconds();
5268 mddev->level = info->level;
5269 mddev->clevel[0] = 0;
5270 mddev->dev_sectors = 2 * (sector_t)info->size;
5271 mddev->raid_disks = info->raid_disks;
5272 /* don't set md_minor, it is determined by which /dev/md* was
5275 if (info->state & (1<<MD_SB_CLEAN))
5276 mddev->recovery_cp = MaxSector;
5278 mddev->recovery_cp = 0;
5279 mddev->persistent = ! info->not_persistent;
5280 mddev->external = 0;
5282 mddev->layout = info->layout;
5283 mddev->chunk_sectors = info->chunk_size >> 9;
5285 mddev->max_disks = MD_SB_DISKS;
5287 if (mddev->persistent)
5289 set_bit(MD_CHANGE_DEVS, &mddev->flags);
5291 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
5292 mddev->bitmap_info.offset = 0;
5294 mddev->reshape_position = MaxSector;
5297 * Generate a 128 bit UUID
5299 get_random_bytes(mddev->uuid, 16);
5301 mddev->new_level = mddev->level;
5302 mddev->new_chunk_sectors = mddev->chunk_sectors;
5303 mddev->new_layout = mddev->layout;
5304 mddev->delta_disks = 0;
5309 void md_set_array_sectors(mddev_t *mddev, sector_t array_sectors)
5311 WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__);
5313 if (mddev->external_size)
5316 mddev->array_sectors = array_sectors;
5318 EXPORT_SYMBOL(md_set_array_sectors);
5320 static int update_size(mddev_t *mddev, sector_t num_sectors)
5324 int fit = (num_sectors == 0);
5326 if (mddev->pers->resize == NULL)
5328 /* The "num_sectors" is the number of sectors of each device that
5329 * is used. This can only make sense for arrays with redundancy.
5330 * linear and raid0 always use whatever space is available. We can only
5331 * consider changing this number if no resync or reconstruction is
5332 * happening, and if the new size is acceptable. It must fit before the
5333 * sb_start or, if that is <data_offset, it must fit before the size
5334 * of each device. If num_sectors is zero, we find the largest size
5338 if (mddev->sync_thread)
5341 /* Sorry, cannot grow a bitmap yet, just remove it,
5345 list_for_each_entry(rdev, &mddev->disks, same_set) {
5346 sector_t avail = rdev->sectors;
5348 if (fit && (num_sectors == 0 || num_sectors > avail))
5349 num_sectors = avail;
5350 if (avail < num_sectors)
5353 rv = mddev->pers->resize(mddev, num_sectors);
5355 revalidate_disk(mddev->gendisk);
5359 static int update_raid_disks(mddev_t *mddev, int raid_disks)
5362 /* change the number of raid disks */
5363 if (mddev->pers->check_reshape == NULL)
5365 if (raid_disks <= 0 ||
5366 raid_disks >= mddev->max_disks)
5368 if (mddev->sync_thread || mddev->reshape_position != MaxSector)
5370 mddev->delta_disks = raid_disks - mddev->raid_disks;
5372 rv = mddev->pers->check_reshape(mddev);
5378 * update_array_info is used to change the configuration of an
5380 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
5381 * fields in the info are checked against the array.
5382 * Any differences that cannot be handled will cause an error.
5383 * Normally, only one change can be managed at a time.
5385 static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
5391 /* calculate expected state,ignoring low bits */
5392 if (mddev->bitmap && mddev->bitmap_info.offset)
5393 state |= (1 << MD_SB_BITMAP_PRESENT);
5395 if (mddev->major_version != info->major_version ||
5396 mddev->minor_version != info->minor_version ||
5397 /* mddev->patch_version != info->patch_version || */
5398 mddev->ctime != info->ctime ||
5399 mddev->level != info->level ||
5400 /* mddev->layout != info->layout || */
5401 !mddev->persistent != info->not_persistent||
5402 mddev->chunk_sectors != info->chunk_size >> 9 ||
5403 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
5404 ((state^info->state) & 0xfffffe00)
5407 /* Check there is only one change */
5408 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
5410 if (mddev->raid_disks != info->raid_disks)
5412 if (mddev->layout != info->layout)
5414 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT))
5421 if (mddev->layout != info->layout) {
5423 * we don't need to do anything at the md level, the
5424 * personality will take care of it all.
5426 if (mddev->pers->check_reshape == NULL)
5429 mddev->new_layout = info->layout;
5430 rv = mddev->pers->check_reshape(mddev);
5432 mddev->new_layout = mddev->layout;
5436 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
5437 rv = update_size(mddev, (sector_t)info->size * 2);
5439 if (mddev->raid_disks != info->raid_disks)
5440 rv = update_raid_disks(mddev, info->raid_disks);
5442 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
5443 if (mddev->pers->quiesce == NULL)
5445 if (mddev->recovery || mddev->sync_thread)
5447 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
5448 /* add the bitmap */
5451 if (mddev->bitmap_info.default_offset == 0)
5453 mddev->bitmap_info.offset =
5454 mddev->bitmap_info.default_offset;
5455 mddev->pers->quiesce(mddev, 1);
5456 rv = bitmap_create(mddev);
5458 bitmap_destroy(mddev);
5459 mddev->pers->quiesce(mddev, 0);
5461 /* remove the bitmap */
5464 if (mddev->bitmap->file)
5466 mddev->pers->quiesce(mddev, 1);
5467 bitmap_destroy(mddev);
5468 mddev->pers->quiesce(mddev, 0);
5469 mddev->bitmap_info.offset = 0;
5472 md_update_sb(mddev, 1);
5476 static int set_disk_faulty(mddev_t *mddev, dev_t dev)
5480 if (mddev->pers == NULL)
5483 rdev = find_rdev(mddev, dev);
5487 md_error(mddev, rdev);
5492 * We have a problem here : there is no easy way to give a CHS
5493 * virtual geometry. We currently pretend that we have a 2 heads
5494 * 4 sectors (with a BIG number of cylinders...). This drives
5495 * dosfs just mad... ;-)
5497 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
5499 mddev_t *mddev = bdev->bd_disk->private_data;
5503 geo->cylinders = get_capacity(mddev->gendisk) / 8;
5507 static int md_ioctl(struct block_device *bdev, fmode_t mode,
5508 unsigned int cmd, unsigned long arg)
5511 void __user *argp = (void __user *)arg;
5512 mddev_t *mddev = NULL;
5515 if (!capable(CAP_SYS_ADMIN))
5519 * Commands dealing with the RAID driver but not any
5525 err = get_version(argp);
5528 case PRINT_RAID_DEBUG:
5536 autostart_arrays(arg);
5543 * Commands creating/starting a new array:
5546 mddev = bdev->bd_disk->private_data;
5553 err = mddev_lock(mddev);
5556 "md: ioctl lock interrupted, reason %d, cmd %d\n",
5563 case SET_ARRAY_INFO:
5565 mdu_array_info_t info;
5567 memset(&info, 0, sizeof(info));
5568 else if (copy_from_user(&info, argp, sizeof(info))) {
5573 err = update_array_info(mddev, &info);
5575 printk(KERN_WARNING "md: couldn't update"
5576 " array info. %d\n", err);
5581 if (!list_empty(&mddev->disks)) {
5583 "md: array %s already has disks!\n",
5588 if (mddev->raid_disks) {
5590 "md: array %s already initialised!\n",
5595 err = set_array_info(mddev, &info);
5597 printk(KERN_WARNING "md: couldn't set"
5598 " array info. %d\n", err);
5608 * Commands querying/configuring an existing array:
5610 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
5611 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
5612 if ((!mddev->raid_disks && !mddev->external)
5613 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
5614 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
5615 && cmd != GET_BITMAP_FILE) {
5621 * Commands even a read-only array can execute:
5625 case GET_ARRAY_INFO:
5626 err = get_array_info(mddev, argp);
5629 case GET_BITMAP_FILE:
5630 err = get_bitmap_file(mddev, argp);
5634 err = get_disk_info(mddev, argp);
5637 case RESTART_ARRAY_RW:
5638 err = restart_array(mddev);
5642 err = do_md_stop(mddev, 0, 1);
5646 err = do_md_stop(mddev, 1, 1);
5650 if (get_user(ro, (int __user *)(arg))) {
5656 /* if the bdev is going readonly the value of mddev->ro
5657 * does not matter, no writes are coming
5662 /* are we are already prepared for writes? */
5666 /* transitioning to readauto need only happen for
5667 * arrays that call md_write_start
5670 err = restart_array(mddev);
5673 set_disk_ro(mddev->gendisk, 0);
5680 * The remaining ioctls are changing the state of the
5681 * superblock, so we do not allow them on read-only arrays.
5682 * However non-MD ioctls (e.g. get-size) will still come through
5683 * here and hit the 'default' below, so only disallow
5684 * 'md' ioctls, and switch to rw mode if started auto-readonly.
5686 if (_IOC_TYPE(cmd) == MD_MAJOR && mddev->ro && mddev->pers) {
5687 if (mddev->ro == 2) {
5689 sysfs_notify_dirent(mddev->sysfs_state);
5690 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5691 md_wakeup_thread(mddev->thread);
5702 mdu_disk_info_t info;
5703 if (copy_from_user(&info, argp, sizeof(info)))
5706 err = add_new_disk(mddev, &info);
5710 case HOT_REMOVE_DISK:
5711 err = hot_remove_disk(mddev, new_decode_dev(arg));
5715 err = hot_add_disk(mddev, new_decode_dev(arg));
5718 case SET_DISK_FAULTY:
5719 err = set_disk_faulty(mddev, new_decode_dev(arg));
5723 err = do_md_run(mddev);
5726 case SET_BITMAP_FILE:
5727 err = set_bitmap_file(mddev, (int)arg);
5737 if (mddev->hold_active == UNTIL_IOCTL &&
5739 mddev->hold_active = 0;
5740 mddev_unlock(mddev);
5749 #ifdef CONFIG_COMPAT
5750 static int md_compat_ioctl(struct block_device *bdev, fmode_t mode,
5751 unsigned int cmd, unsigned long arg)
5754 case HOT_REMOVE_DISK:
5756 case SET_DISK_FAULTY:
5757 case SET_BITMAP_FILE:
5758 /* These take in integer arg, do not convert */
5761 arg = (unsigned long)compat_ptr(arg);
5765 return md_ioctl(bdev, mode, cmd, arg);
5767 #endif /* CONFIG_COMPAT */
5769 static int md_open(struct block_device *bdev, fmode_t mode)
5772 * Succeed if we can lock the mddev, which confirms that
5773 * it isn't being stopped right now.
5775 mddev_t *mddev = mddev_find(bdev->bd_dev);
5778 if (mddev->gendisk != bdev->bd_disk) {
5779 /* we are racing with mddev_put which is discarding this
5783 /* Wait until bdev->bd_disk is definitely gone */
5784 flush_scheduled_work();
5785 /* Then retry the open from the top */
5786 return -ERESTARTSYS;
5788 BUG_ON(mddev != bdev->bd_disk->private_data);
5790 if ((err = mutex_lock_interruptible(&mddev->open_mutex)))
5794 atomic_inc(&mddev->openers);
5795 mutex_unlock(&mddev->open_mutex);
5797 check_disk_change(bdev);
5802 static int md_release(struct gendisk *disk, fmode_t mode)
5804 mddev_t *mddev = disk->private_data;
5807 atomic_dec(&mddev->openers);
5813 static int md_media_changed(struct gendisk *disk)
5815 mddev_t *mddev = disk->private_data;
5817 return mddev->changed;
5820 static int md_revalidate(struct gendisk *disk)
5822 mddev_t *mddev = disk->private_data;
5827 static const struct block_device_operations md_fops =
5829 .owner = THIS_MODULE,
5831 .release = md_release,
5833 #ifdef CONFIG_COMPAT
5834 .compat_ioctl = md_compat_ioctl,
5836 .getgeo = md_getgeo,
5837 .media_changed = md_media_changed,
5838 .revalidate_disk= md_revalidate,
5841 static int md_thread(void * arg)
5843 mdk_thread_t *thread = arg;
5846 * md_thread is a 'system-thread', it's priority should be very
5847 * high. We avoid resource deadlocks individually in each
5848 * raid personality. (RAID5 does preallocation) We also use RR and
5849 * the very same RT priority as kswapd, thus we will never get
5850 * into a priority inversion deadlock.
5852 * we definitely have to have equal or higher priority than
5853 * bdflush, otherwise bdflush will deadlock if there are too
5854 * many dirty RAID5 blocks.
5857 allow_signal(SIGKILL);
5858 while (!kthread_should_stop()) {
5860 /* We need to wait INTERRUPTIBLE so that
5861 * we don't add to the load-average.
5862 * That means we need to be sure no signals are
5865 if (signal_pending(current))
5866 flush_signals(current);
5868 wait_event_interruptible_timeout
5870 test_bit(THREAD_WAKEUP, &thread->flags)
5871 || kthread_should_stop(),
5874 clear_bit(THREAD_WAKEUP, &thread->flags);
5876 thread->run(thread->mddev);
5882 void md_wakeup_thread(mdk_thread_t *thread)
5885 dprintk("md: waking up MD thread %s.\n", thread->tsk->comm);
5886 set_bit(THREAD_WAKEUP, &thread->flags);
5887 wake_up(&thread->wqueue);
5891 mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
5894 mdk_thread_t *thread;
5896 thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL);
5900 init_waitqueue_head(&thread->wqueue);
5903 thread->mddev = mddev;
5904 thread->timeout = MAX_SCHEDULE_TIMEOUT;
5905 thread->tsk = kthread_run(md_thread, thread,
5907 mdname(thread->mddev),
5908 name ?: mddev->pers->name);
5909 if (IS_ERR(thread->tsk)) {
5916 void md_unregister_thread(mdk_thread_t *thread)
5920 dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
5922 kthread_stop(thread->tsk);
5926 void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
5933 if (!rdev || test_bit(Faulty, &rdev->flags))
5936 if (mddev->external)
5937 set_bit(Blocked, &rdev->flags);
5939 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
5941 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
5942 __builtin_return_address(0),__builtin_return_address(1),
5943 __builtin_return_address(2),__builtin_return_address(3));
5947 if (!mddev->pers->error_handler)
5949 mddev->pers->error_handler(mddev,rdev);
5950 if (mddev->degraded)
5951 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
5952 set_bit(StateChanged, &rdev->flags);
5953 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5954 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5955 md_wakeup_thread(mddev->thread);
5956 md_new_event_inintr(mddev);
5959 /* seq_file implementation /proc/mdstat */
5961 static void status_unused(struct seq_file *seq)
5966 seq_printf(seq, "unused devices: ");
5968 list_for_each_entry(rdev, &pending_raid_disks, same_set) {
5969 char b[BDEVNAME_SIZE];
5971 seq_printf(seq, "%s ",
5972 bdevname(rdev->bdev,b));
5975 seq_printf(seq, "<none>");
5977 seq_printf(seq, "\n");
5981 static void status_resync(struct seq_file *seq, mddev_t * mddev)
5983 sector_t max_sectors, resync, res;
5984 unsigned long dt, db;
5987 unsigned int per_milli;
5989 resync = mddev->curr_resync - atomic_read(&mddev->recovery_active);
5991 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
5992 max_sectors = mddev->resync_max_sectors;
5994 max_sectors = mddev->dev_sectors;
5997 * Should not happen.
6003 /* Pick 'scale' such that (resync>>scale)*1000 will fit
6004 * in a sector_t, and (max_sectors>>scale) will fit in a
6005 * u32, as those are the requirements for sector_div.
6006 * Thus 'scale' must be at least 10
6009 if (sizeof(sector_t) > sizeof(unsigned long)) {
6010 while ( max_sectors/2 > (1ULL<<(scale+32)))
6013 res = (resync>>scale)*1000;
6014 sector_div(res, (u32)((max_sectors>>scale)+1));
6018 int i, x = per_milli/50, y = 20-x;
6019 seq_printf(seq, "[");
6020 for (i = 0; i < x; i++)
6021 seq_printf(seq, "=");
6022 seq_printf(seq, ">");
6023 for (i = 0; i < y; i++)
6024 seq_printf(seq, ".");
6025 seq_printf(seq, "] ");
6027 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
6028 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
6030 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
6032 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
6033 "resync" : "recovery"))),
6034 per_milli/10, per_milli % 10,
6035 (unsigned long long) resync/2,
6036 (unsigned long long) max_sectors/2);
6039 * dt: time from mark until now
6040 * db: blocks written from mark until now
6041 * rt: remaining time
6043 * rt is a sector_t, so could be 32bit or 64bit.
6044 * So we divide before multiply in case it is 32bit and close
6046 * We scale the divisor (db) by 32 to avoid loosing precision
6047 * near the end of resync when the number of remaining sectors
6049 * We then divide rt by 32 after multiplying by db to compensate.
6050 * The '+1' avoids division by zero if db is very small.
6052 dt = ((jiffies - mddev->resync_mark) / HZ);
6054 db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active))
6055 - mddev->resync_mark_cnt;
6057 rt = max_sectors - resync; /* number of remaining sectors */
6058 sector_div(rt, db/32+1);
6062 seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60,
6063 ((unsigned long)rt % 60)/6);
6065 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
6068 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
6070 struct list_head *tmp;
6080 spin_lock(&all_mddevs_lock);
6081 list_for_each(tmp,&all_mddevs)
6083 mddev = list_entry(tmp, mddev_t, all_mddevs);
6085 spin_unlock(&all_mddevs_lock);
6088 spin_unlock(&all_mddevs_lock);
6090 return (void*)2;/* tail */
6094 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
6096 struct list_head *tmp;
6097 mddev_t *next_mddev, *mddev = v;
6103 spin_lock(&all_mddevs_lock);
6105 tmp = all_mddevs.next;
6107 tmp = mddev->all_mddevs.next;
6108 if (tmp != &all_mddevs)
6109 next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs));
6111 next_mddev = (void*)2;
6114 spin_unlock(&all_mddevs_lock);
6122 static void md_seq_stop(struct seq_file *seq, void *v)
6126 if (mddev && v != (void*)1 && v != (void*)2)
6130 struct mdstat_info {
6134 static int md_seq_show(struct seq_file *seq, void *v)
6139 struct mdstat_info *mi = seq->private;
6140 struct bitmap *bitmap;
6142 if (v == (void*)1) {
6143 struct mdk_personality *pers;
6144 seq_printf(seq, "Personalities : ");
6145 spin_lock(&pers_lock);
6146 list_for_each_entry(pers, &pers_list, list)
6147 seq_printf(seq, "[%s] ", pers->name);
6149 spin_unlock(&pers_lock);
6150 seq_printf(seq, "\n");
6151 mi->event = atomic_read(&md_event_count);
6154 if (v == (void*)2) {
6159 if (mddev_lock(mddev) < 0)
6162 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
6163 seq_printf(seq, "%s : %sactive", mdname(mddev),
6164 mddev->pers ? "" : "in");
6167 seq_printf(seq, " (read-only)");
6169 seq_printf(seq, " (auto-read-only)");
6170 seq_printf(seq, " %s", mddev->pers->name);
6174 list_for_each_entry(rdev, &mddev->disks, same_set) {
6175 char b[BDEVNAME_SIZE];
6176 seq_printf(seq, " %s[%d]",
6177 bdevname(rdev->bdev,b), rdev->desc_nr);
6178 if (test_bit(WriteMostly, &rdev->flags))
6179 seq_printf(seq, "(W)");
6180 if (test_bit(Faulty, &rdev->flags)) {
6181 seq_printf(seq, "(F)");
6183 } else if (rdev->raid_disk < 0)
6184 seq_printf(seq, "(S)"); /* spare */
6185 sectors += rdev->sectors;
6188 if (!list_empty(&mddev->disks)) {
6190 seq_printf(seq, "\n %llu blocks",
6191 (unsigned long long)
6192 mddev->array_sectors / 2);
6194 seq_printf(seq, "\n %llu blocks",
6195 (unsigned long long)sectors / 2);
6197 if (mddev->persistent) {
6198 if (mddev->major_version != 0 ||
6199 mddev->minor_version != 90) {
6200 seq_printf(seq," super %d.%d",
6201 mddev->major_version,
6202 mddev->minor_version);
6204 } else if (mddev->external)
6205 seq_printf(seq, " super external:%s",
6206 mddev->metadata_type);
6208 seq_printf(seq, " super non-persistent");
6211 mddev->pers->status(seq, mddev);
6212 seq_printf(seq, "\n ");
6213 if (mddev->pers->sync_request) {
6214 if (mddev->curr_resync > 2) {
6215 status_resync(seq, mddev);
6216 seq_printf(seq, "\n ");
6217 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
6218 seq_printf(seq, "\tresync=DELAYED\n ");
6219 else if (mddev->recovery_cp < MaxSector)
6220 seq_printf(seq, "\tresync=PENDING\n ");
6223 seq_printf(seq, "\n ");
6225 if ((bitmap = mddev->bitmap)) {
6226 unsigned long chunk_kb;
6227 unsigned long flags;
6228 spin_lock_irqsave(&bitmap->lock, flags);
6229 chunk_kb = mddev->bitmap_info.chunksize >> 10;
6230 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
6232 bitmap->pages - bitmap->missing_pages,
6234 (bitmap->pages - bitmap->missing_pages)
6235 << (PAGE_SHIFT - 10),
6236 chunk_kb ? chunk_kb : mddev->bitmap_info.chunksize,
6237 chunk_kb ? "KB" : "B");
6239 seq_printf(seq, ", file: ");
6240 seq_path(seq, &bitmap->file->f_path, " \t\n");
6243 seq_printf(seq, "\n");
6244 spin_unlock_irqrestore(&bitmap->lock, flags);
6247 seq_printf(seq, "\n");
6249 mddev_unlock(mddev);
6254 static const struct seq_operations md_seq_ops = {
6255 .start = md_seq_start,
6256 .next = md_seq_next,
6257 .stop = md_seq_stop,
6258 .show = md_seq_show,
6261 static int md_seq_open(struct inode *inode, struct file *file)
6264 struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL);
6268 error = seq_open(file, &md_seq_ops);
6272 struct seq_file *p = file->private_data;
6274 mi->event = atomic_read(&md_event_count);
6279 static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
6281 struct seq_file *m = filp->private_data;
6282 struct mdstat_info *mi = m->private;
6285 poll_wait(filp, &md_event_waiters, wait);
6287 /* always allow read */
6288 mask = POLLIN | POLLRDNORM;
6290 if (mi->event != atomic_read(&md_event_count))
6291 mask |= POLLERR | POLLPRI;
6295 static const struct file_operations md_seq_fops = {
6296 .owner = THIS_MODULE,
6297 .open = md_seq_open,
6299 .llseek = seq_lseek,
6300 .release = seq_release_private,
6301 .poll = mdstat_poll,
6304 int register_md_personality(struct mdk_personality *p)
6306 spin_lock(&pers_lock);
6307 list_add_tail(&p->list, &pers_list);
6308 printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level);
6309 spin_unlock(&pers_lock);
6313 int unregister_md_personality(struct mdk_personality *p)
6315 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
6316 spin_lock(&pers_lock);
6317 list_del_init(&p->list);
6318 spin_unlock(&pers_lock);
6322 static int is_mddev_idle(mddev_t *mddev, int init)
6330 rdev_for_each_rcu(rdev, mddev) {
6331 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
6332 curr_events = (int)part_stat_read(&disk->part0, sectors[0]) +
6333 (int)part_stat_read(&disk->part0, sectors[1]) -
6334 atomic_read(&disk->sync_io);
6335 /* sync IO will cause sync_io to increase before the disk_stats
6336 * as sync_io is counted when a request starts, and
6337 * disk_stats is counted when it completes.
6338 * So resync activity will cause curr_events to be smaller than
6339 * when there was no such activity.
6340 * non-sync IO will cause disk_stat to increase without
6341 * increasing sync_io so curr_events will (eventually)
6342 * be larger than it was before. Once it becomes
6343 * substantially larger, the test below will cause
6344 * the array to appear non-idle, and resync will slow
6346 * If there is a lot of outstanding resync activity when
6347 * we set last_event to curr_events, then all that activity
6348 * completing might cause the array to appear non-idle
6349 * and resync will be slowed down even though there might
6350 * not have been non-resync activity. This will only
6351 * happen once though. 'last_events' will soon reflect
6352 * the state where there is little or no outstanding
6353 * resync requests, and further resync activity will
6354 * always make curr_events less than last_events.
6357 if (init || curr_events - rdev->last_events > 64) {
6358 rdev->last_events = curr_events;
6366 void md_done_sync(mddev_t *mddev, int blocks, int ok)
6368 /* another "blocks" (512byte) blocks have been synced */
6369 atomic_sub(blocks, &mddev->recovery_active);
6370 wake_up(&mddev->recovery_wait);
6372 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6373 md_wakeup_thread(mddev->thread);
6374 // stop recovery, signal do_sync ....
6379 /* md_write_start(mddev, bi)
6380 * If we need to update some array metadata (e.g. 'active' flag
6381 * in superblock) before writing, schedule a superblock update
6382 * and wait for it to complete.
6384 void md_write_start(mddev_t *mddev, struct bio *bi)
6387 if (bio_data_dir(bi) != WRITE)
6390 BUG_ON(mddev->ro == 1);
6391 if (mddev->ro == 2) {
6392 /* need to switch to read/write */
6394 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6395 md_wakeup_thread(mddev->thread);
6396 md_wakeup_thread(mddev->sync_thread);
6399 atomic_inc(&mddev->writes_pending);
6400 if (mddev->safemode == 1)
6401 mddev->safemode = 0;
6402 if (mddev->in_sync) {
6403 spin_lock_irq(&mddev->write_lock);
6404 if (mddev->in_sync) {
6406 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6407 md_wakeup_thread(mddev->thread);
6410 spin_unlock_irq(&mddev->write_lock);
6413 sysfs_notify_dirent(mddev->sysfs_state);
6414 wait_event(mddev->sb_wait,
6415 !test_bit(MD_CHANGE_CLEAN, &mddev->flags) &&
6416 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
6419 void md_write_end(mddev_t *mddev)
6421 if (atomic_dec_and_test(&mddev->writes_pending)) {
6422 if (mddev->safemode == 2)
6423 md_wakeup_thread(mddev->thread);
6424 else if (mddev->safemode_delay)
6425 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
6429 /* md_allow_write(mddev)
6430 * Calling this ensures that the array is marked 'active' so that writes
6431 * may proceed without blocking. It is important to call this before
6432 * attempting a GFP_KERNEL allocation while holding the mddev lock.
6433 * Must be called with mddev_lock held.
6435 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
6436 * is dropped, so return -EAGAIN after notifying userspace.
6438 int md_allow_write(mddev_t *mddev)
6444 if (!mddev->pers->sync_request)
6447 spin_lock_irq(&mddev->write_lock);
6448 if (mddev->in_sync) {
6450 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6451 if (mddev->safemode_delay &&
6452 mddev->safemode == 0)
6453 mddev->safemode = 1;
6454 spin_unlock_irq(&mddev->write_lock);
6455 md_update_sb(mddev, 0);
6456 sysfs_notify_dirent(mddev->sysfs_state);
6458 spin_unlock_irq(&mddev->write_lock);
6460 if (test_bit(MD_CHANGE_CLEAN, &mddev->flags))
6465 EXPORT_SYMBOL_GPL(md_allow_write);
6467 #define SYNC_MARKS 10
6468 #define SYNC_MARK_STEP (3*HZ)
6469 void md_do_sync(mddev_t *mddev)
6472 unsigned int currspeed = 0,
6474 sector_t max_sectors,j, io_sectors;
6475 unsigned long mark[SYNC_MARKS];
6476 sector_t mark_cnt[SYNC_MARKS];
6478 struct list_head *tmp;
6479 sector_t last_check;
6484 /* just incase thread restarts... */
6485 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
6487 if (mddev->ro) /* never try to sync a read-only array */
6490 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
6491 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
6492 desc = "data-check";
6493 else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
6494 desc = "requested-resync";
6497 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
6502 /* we overload curr_resync somewhat here.
6503 * 0 == not engaged in resync at all
6504 * 2 == checking that there is no conflict with another sync
6505 * 1 == like 2, but have yielded to allow conflicting resync to
6507 * other == active in resync - this many blocks
6509 * Before starting a resync we must have set curr_resync to
6510 * 2, and then checked that every "conflicting" array has curr_resync
6511 * less than ours. When we find one that is the same or higher
6512 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
6513 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
6514 * This will mean we have to start checking from the beginning again.
6519 mddev->curr_resync = 2;
6522 if (kthread_should_stop())
6523 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6525 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
6527 for_each_mddev(mddev2, tmp) {
6528 if (mddev2 == mddev)
6530 if (!mddev->parallel_resync
6531 && mddev2->curr_resync
6532 && match_mddev_units(mddev, mddev2)) {
6534 if (mddev < mddev2 && mddev->curr_resync == 2) {
6535 /* arbitrarily yield */
6536 mddev->curr_resync = 1;
6537 wake_up(&resync_wait);
6539 if (mddev > mddev2 && mddev->curr_resync == 1)
6540 /* no need to wait here, we can wait the next
6541 * time 'round when curr_resync == 2
6544 /* We need to wait 'interruptible' so as not to
6545 * contribute to the load average, and not to
6546 * be caught by 'softlockup'
6548 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
6549 if (!kthread_should_stop() &&
6550 mddev2->curr_resync >= mddev->curr_resync) {
6551 printk(KERN_INFO "md: delaying %s of %s"
6552 " until %s has finished (they"
6553 " share one or more physical units)\n",
6554 desc, mdname(mddev), mdname(mddev2));
6556 if (signal_pending(current))
6557 flush_signals(current);
6559 finish_wait(&resync_wait, &wq);
6562 finish_wait(&resync_wait, &wq);
6565 } while (mddev->curr_resync < 2);
6568 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
6569 /* resync follows the size requested by the personality,
6570 * which defaults to physical size, but can be virtual size
6572 max_sectors = mddev->resync_max_sectors;
6573 mddev->resync_mismatches = 0;
6574 /* we don't use the checkpoint if there's a bitmap */
6575 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
6576 j = mddev->resync_min;
6577 else if (!mddev->bitmap)
6578 j = mddev->recovery_cp;
6580 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
6581 max_sectors = mddev->dev_sectors;
6583 /* recovery follows the physical size of devices */
6584 max_sectors = mddev->dev_sectors;
6587 list_for_each_entry_rcu(rdev, &mddev->disks, same_set)
6588 if (rdev->raid_disk >= 0 &&
6589 !test_bit(Faulty, &rdev->flags) &&
6590 !test_bit(In_sync, &rdev->flags) &&
6591 rdev->recovery_offset < j)
6592 j = rdev->recovery_offset;
6596 printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev));
6597 printk(KERN_INFO "md: minimum _guaranteed_ speed:"
6598 " %d KB/sec/disk.\n", speed_min(mddev));
6599 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
6600 "(but not more than %d KB/sec) for %s.\n",
6601 speed_max(mddev), desc);
6603 is_mddev_idle(mddev, 1); /* this initializes IO event counters */
6606 for (m = 0; m < SYNC_MARKS; m++) {
6608 mark_cnt[m] = io_sectors;
6611 mddev->resync_mark = mark[last_mark];
6612 mddev->resync_mark_cnt = mark_cnt[last_mark];
6615 * Tune reconstruction:
6617 window = 32*(PAGE_SIZE/512);
6618 printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n",
6619 window/2,(unsigned long long) max_sectors/2);
6621 atomic_set(&mddev->recovery_active, 0);
6626 "md: resuming %s of %s from checkpoint.\n",
6627 desc, mdname(mddev));
6628 mddev->curr_resync = j;
6630 mddev->curr_resync_completed = mddev->curr_resync;
6632 while (j < max_sectors) {
6637 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
6638 ((mddev->curr_resync > mddev->curr_resync_completed &&
6639 (mddev->curr_resync - mddev->curr_resync_completed)
6640 > (max_sectors >> 4)) ||
6641 (j - mddev->curr_resync_completed)*2
6642 >= mddev->resync_max - mddev->curr_resync_completed
6644 /* time to update curr_resync_completed */
6645 blk_unplug(mddev->queue);
6646 wait_event(mddev->recovery_wait,
6647 atomic_read(&mddev->recovery_active) == 0);
6648 mddev->curr_resync_completed =
6650 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6651 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
6654 while (j >= mddev->resync_max && !kthread_should_stop()) {
6655 /* As this condition is controlled by user-space,
6656 * we can block indefinitely, so use '_interruptible'
6657 * to avoid triggering warnings.
6659 flush_signals(current); /* just in case */
6660 wait_event_interruptible(mddev->recovery_wait,
6661 mddev->resync_max > j
6662 || kthread_should_stop());
6665 if (kthread_should_stop())
6668 sectors = mddev->pers->sync_request(mddev, j, &skipped,
6669 currspeed < speed_min(mddev));
6671 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6675 if (!skipped) { /* actual IO requested */
6676 io_sectors += sectors;
6677 atomic_add(sectors, &mddev->recovery_active);
6681 if (j>1) mddev->curr_resync = j;
6682 mddev->curr_mark_cnt = io_sectors;
6683 if (last_check == 0)
6684 /* this is the earliers that rebuilt will be
6685 * visible in /proc/mdstat
6687 md_new_event(mddev);
6689 if (last_check + window > io_sectors || j == max_sectors)
6692 last_check = io_sectors;
6694 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
6698 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
6700 int next = (last_mark+1) % SYNC_MARKS;
6702 mddev->resync_mark = mark[next];
6703 mddev->resync_mark_cnt = mark_cnt[next];
6704 mark[next] = jiffies;
6705 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
6710 if (kthread_should_stop())
6715 * this loop exits only if either when we are slower than
6716 * the 'hard' speed limit, or the system was IO-idle for
6718 * the system might be non-idle CPU-wise, but we only care
6719 * about not overloading the IO subsystem. (things like an
6720 * e2fsck being done on the RAID array should execute fast)
6722 blk_unplug(mddev->queue);
6725 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
6726 /((jiffies-mddev->resync_mark)/HZ +1) +1;
6728 if (currspeed > speed_min(mddev)) {
6729 if ((currspeed > speed_max(mddev)) ||
6730 !is_mddev_idle(mddev, 0)) {
6736 printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc);
6738 * this also signals 'finished resyncing' to md_stop
6741 blk_unplug(mddev->queue);
6743 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
6745 /* tell personality that we are finished */
6746 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
6748 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
6749 mddev->curr_resync > 2) {
6750 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
6751 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
6752 if (mddev->curr_resync >= mddev->recovery_cp) {
6754 "md: checkpointing %s of %s.\n",
6755 desc, mdname(mddev));
6756 mddev->recovery_cp = mddev->curr_resync;
6759 mddev->recovery_cp = MaxSector;
6761 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
6762 mddev->curr_resync = MaxSector;
6764 list_for_each_entry_rcu(rdev, &mddev->disks, same_set)
6765 if (rdev->raid_disk >= 0 &&
6766 !test_bit(Faulty, &rdev->flags) &&
6767 !test_bit(In_sync, &rdev->flags) &&
6768 rdev->recovery_offset < mddev->curr_resync)
6769 rdev->recovery_offset = mddev->curr_resync;
6773 set_bit(MD_CHANGE_DEVS, &mddev->flags);
6776 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
6777 /* We completed so min/max setting can be forgotten if used. */
6778 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
6779 mddev->resync_min = 0;
6780 mddev->resync_max = MaxSector;
6781 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
6782 mddev->resync_min = mddev->curr_resync_completed;
6783 mddev->curr_resync = 0;
6784 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
6785 mddev->curr_resync_completed = 0;
6786 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
6787 wake_up(&resync_wait);
6788 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
6789 md_wakeup_thread(mddev->thread);
6794 * got a signal, exit.
6797 "md: md_do_sync() got signal ... exiting\n");
6798 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6802 EXPORT_SYMBOL_GPL(md_do_sync);
6805 static int remove_and_add_spares(mddev_t *mddev)
6810 mddev->curr_resync_completed = 0;
6812 list_for_each_entry(rdev, &mddev->disks, same_set)
6813 if (rdev->raid_disk >= 0 &&
6814 !test_bit(Blocked, &rdev->flags) &&
6815 (test_bit(Faulty, &rdev->flags) ||
6816 ! test_bit(In_sync, &rdev->flags)) &&
6817 atomic_read(&rdev->nr_pending)==0) {
6818 if (mddev->pers->hot_remove_disk(
6819 mddev, rdev->raid_disk)==0) {
6821 sprintf(nm,"rd%d", rdev->raid_disk);
6822 sysfs_remove_link(&mddev->kobj, nm);
6823 rdev->raid_disk = -1;
6827 if (mddev->degraded && ! mddev->ro && !mddev->recovery_disabled) {
6828 list_for_each_entry(rdev, &mddev->disks, same_set) {
6829 if (rdev->raid_disk >= 0 &&
6830 !test_bit(In_sync, &rdev->flags) &&
6831 !test_bit(Blocked, &rdev->flags))
6833 if (rdev->raid_disk < 0
6834 && !test_bit(Faulty, &rdev->flags)) {
6835 rdev->recovery_offset = 0;
6837 hot_add_disk(mddev, rdev) == 0) {
6839 sprintf(nm, "rd%d", rdev->raid_disk);
6840 if (sysfs_create_link(&mddev->kobj,
6843 "md: cannot register "
6847 md_new_event(mddev);
6848 set_bit(MD_CHANGE_DEVS, &mddev->flags);
6857 * This routine is regularly called by all per-raid-array threads to
6858 * deal with generic issues like resync and super-block update.
6859 * Raid personalities that don't have a thread (linear/raid0) do not
6860 * need this as they never do any recovery or update the superblock.
6862 * It does not do any resync itself, but rather "forks" off other threads
6863 * to do that as needed.
6864 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
6865 * "->recovery" and create a thread at ->sync_thread.
6866 * When the thread finishes it sets MD_RECOVERY_DONE
6867 * and wakeups up this thread which will reap the thread and finish up.
6868 * This thread also removes any faulty devices (with nr_pending == 0).
6870 * The overall approach is:
6871 * 1/ if the superblock needs updating, update it.
6872 * 2/ If a recovery thread is running, don't do anything else.
6873 * 3/ If recovery has finished, clean up, possibly marking spares active.
6874 * 4/ If there are any faulty devices, remove them.
6875 * 5/ If array is degraded, try to add spares devices
6876 * 6/ If array has spares or is not in-sync, start a resync thread.
6878 void md_check_recovery(mddev_t *mddev)
6884 bitmap_daemon_work(mddev);
6889 if (signal_pending(current)) {
6890 if (mddev->pers->sync_request && !mddev->external) {
6891 printk(KERN_INFO "md: %s in immediate safe mode\n",
6893 mddev->safemode = 2;
6895 flush_signals(current);
6898 if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
6901 (mddev->flags && !mddev->external) ||
6902 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
6903 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
6904 (mddev->external == 0 && mddev->safemode == 1) ||
6905 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
6906 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
6910 if (mddev_trylock(mddev)) {
6914 /* Only thing we do on a ro array is remove
6917 remove_and_add_spares(mddev);
6918 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6922 if (!mddev->external) {
6924 spin_lock_irq(&mddev->write_lock);
6925 if (mddev->safemode &&
6926 !atomic_read(&mddev->writes_pending) &&
6928 mddev->recovery_cp == MaxSector) {
6931 if (mddev->persistent)
6932 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6934 if (mddev->safemode == 1)
6935 mddev->safemode = 0;
6936 spin_unlock_irq(&mddev->write_lock);
6938 sysfs_notify_dirent(mddev->sysfs_state);
6942 md_update_sb(mddev, 0);
6944 list_for_each_entry(rdev, &mddev->disks, same_set)
6945 if (test_and_clear_bit(StateChanged, &rdev->flags))
6946 sysfs_notify_dirent(rdev->sysfs_state);
6949 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
6950 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
6951 /* resync/recovery still happening */
6952 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6955 if (mddev->sync_thread) {
6956 /* resync has finished, collect result */
6957 md_unregister_thread(mddev->sync_thread);
6958 mddev->sync_thread = NULL;
6959 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
6960 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
6962 /* activate any spares */
6963 if (mddev->pers->spare_active(mddev))
6964 sysfs_notify(&mddev->kobj, NULL,
6967 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
6968 mddev->pers->finish_reshape)
6969 mddev->pers->finish_reshape(mddev);
6970 md_update_sb(mddev, 1);
6972 /* if array is no-longer degraded, then any saved_raid_disk
6973 * information must be scrapped
6975 if (!mddev->degraded)
6976 list_for_each_entry(rdev, &mddev->disks, same_set)
6977 rdev->saved_raid_disk = -1;
6979 mddev->recovery = 0;
6980 /* flag recovery needed just to double check */
6981 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6982 sysfs_notify_dirent(mddev->sysfs_action);
6983 md_new_event(mddev);
6986 /* Set RUNNING before clearing NEEDED to avoid
6987 * any transients in the value of "sync_action".
6989 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
6990 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6991 /* Clear some bits that don't mean anything, but
6994 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
6995 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
6997 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
6999 /* no recovery is running.
7000 * remove any failed drives, then
7001 * add spares if possible.
7002 * Spare are also removed and re-added, to allow
7003 * the personality to fail the re-add.
7006 if (mddev->reshape_position != MaxSector) {
7007 if (mddev->pers->check_reshape == NULL ||
7008 mddev->pers->check_reshape(mddev) != 0)
7009 /* Cannot proceed */
7011 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
7012 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7013 } else if ((spares = remove_and_add_spares(mddev))) {
7014 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7015 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
7016 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
7017 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7018 } else if (mddev->recovery_cp < MaxSector) {
7019 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7020 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7021 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
7022 /* nothing to be done ... */
7025 if (mddev->pers->sync_request) {
7026 if (spares && mddev->bitmap && ! mddev->bitmap->file) {
7027 /* We are adding a device or devices to an array
7028 * which has the bitmap stored on all devices.
7029 * So make sure all bitmap pages get written
7031 bitmap_write_all(mddev->bitmap);
7033 mddev->sync_thread = md_register_thread(md_do_sync,
7036 if (!mddev->sync_thread) {
7037 printk(KERN_ERR "%s: could not start resync"
7040 /* leave the spares where they are, it shouldn't hurt */
7041 mddev->recovery = 0;
7043 md_wakeup_thread(mddev->sync_thread);
7044 sysfs_notify_dirent(mddev->sysfs_action);
7045 md_new_event(mddev);
7048 if (!mddev->sync_thread) {
7049 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7050 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
7052 if (mddev->sysfs_action)
7053 sysfs_notify_dirent(mddev->sysfs_action);
7055 mddev_unlock(mddev);
7059 void md_wait_for_blocked_rdev(mdk_rdev_t *rdev, mddev_t *mddev)
7061 sysfs_notify_dirent(rdev->sysfs_state);
7062 wait_event_timeout(rdev->blocked_wait,
7063 !test_bit(Blocked, &rdev->flags),
7064 msecs_to_jiffies(5000));
7065 rdev_dec_pending(rdev, mddev);
7067 EXPORT_SYMBOL(md_wait_for_blocked_rdev);
7069 static int md_notify_reboot(struct notifier_block *this,
7070 unsigned long code, void *x)
7072 struct list_head *tmp;
7075 if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) {
7077 printk(KERN_INFO "md: stopping all md devices.\n");
7079 for_each_mddev(mddev, tmp)
7080 if (mddev_trylock(mddev)) {
7081 /* Force a switch to readonly even array
7082 * appears to still be in use. Hence
7085 do_md_stop(mddev, 1, 100);
7086 mddev_unlock(mddev);
7089 * certain more exotic SCSI devices are known to be
7090 * volatile wrt too early system reboots. While the
7091 * right place to handle this issue is the given
7092 * driver, we do want to have a safe RAID driver ...
7099 static struct notifier_block md_notifier = {
7100 .notifier_call = md_notify_reboot,
7102 .priority = INT_MAX, /* before any real devices */
7105 static void md_geninit(void)
7107 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
7109 proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops);
7112 static int __init md_init(void)
7114 if (register_blkdev(MD_MAJOR, "md"))
7116 if ((mdp_major=register_blkdev(0, "mdp"))<=0) {
7117 unregister_blkdev(MD_MAJOR, "md");
7120 blk_register_region(MKDEV(MD_MAJOR, 0), 1UL<<MINORBITS, THIS_MODULE,
7121 md_probe, NULL, NULL);
7122 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
7123 md_probe, NULL, NULL);
7125 register_reboot_notifier(&md_notifier);
7126 raid_table_header = register_sysctl_table(raid_root_table);
7136 * Searches all registered partitions for autorun RAID arrays
7140 static LIST_HEAD(all_detected_devices);
7141 struct detected_devices_node {
7142 struct list_head list;
7146 void md_autodetect_dev(dev_t dev)
7148 struct detected_devices_node *node_detected_dev;
7150 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
7151 if (node_detected_dev) {
7152 node_detected_dev->dev = dev;
7153 list_add_tail(&node_detected_dev->list, &all_detected_devices);
7155 printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed"
7156 ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev));
7161 static void autostart_arrays(int part)
7164 struct detected_devices_node *node_detected_dev;
7166 int i_scanned, i_passed;
7171 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
7173 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
7175 node_detected_dev = list_entry(all_detected_devices.next,
7176 struct detected_devices_node, list);
7177 list_del(&node_detected_dev->list);
7178 dev = node_detected_dev->dev;
7179 kfree(node_detected_dev);
7180 rdev = md_import_device(dev,0, 90);
7184 if (test_bit(Faulty, &rdev->flags)) {
7188 set_bit(AutoDetected, &rdev->flags);
7189 list_add(&rdev->same_set, &pending_raid_disks);
7193 printk(KERN_INFO "md: Scanned %d and added %d devices.\n",
7194 i_scanned, i_passed);
7196 autorun_devices(part);
7199 #endif /* !MODULE */
7201 static __exit void md_exit(void)
7204 struct list_head *tmp;
7206 blk_unregister_region(MKDEV(MD_MAJOR,0), 1U << MINORBITS);
7207 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
7209 unregister_blkdev(MD_MAJOR,"md");
7210 unregister_blkdev(mdp_major, "mdp");
7211 unregister_reboot_notifier(&md_notifier);
7212 unregister_sysctl_table(raid_table_header);
7213 remove_proc_entry("mdstat", NULL);
7214 for_each_mddev(mddev, tmp) {
7215 export_array(mddev);
7216 mddev->hold_active = 0;
7220 subsys_initcall(md_init);
7221 module_exit(md_exit)
7223 static int get_ro(char *buffer, struct kernel_param *kp)
7225 return sprintf(buffer, "%d", start_readonly);
7227 static int set_ro(const char *val, struct kernel_param *kp)
7230 int num = simple_strtoul(val, &e, 10);
7231 if (*val && (*e == '\0' || *e == '\n')) {
7232 start_readonly = num;
7238 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
7239 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
7241 module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR);
7243 EXPORT_SYMBOL(register_md_personality);
7244 EXPORT_SYMBOL(unregister_md_personality);
7245 EXPORT_SYMBOL(md_error);
7246 EXPORT_SYMBOL(md_done_sync);
7247 EXPORT_SYMBOL(md_write_start);
7248 EXPORT_SYMBOL(md_write_end);
7249 EXPORT_SYMBOL(md_register_thread);
7250 EXPORT_SYMBOL(md_unregister_thread);
7251 EXPORT_SYMBOL(md_wakeup_thread);
7252 EXPORT_SYMBOL(md_check_recovery);
7253 MODULE_LICENSE("GPL");
7254 MODULE_DESCRIPTION("MD RAID framework");
7256 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);