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/hdreg.h>
43 #include <linux/proc_fs.h>
44 #include <linux/random.h>
45 #include <linux/reboot.h>
46 #include <linux/file.h>
47 #include <linux/compat.h>
48 #include <linux/delay.h>
49 #include <linux/raid/md_p.h>
50 #include <linux/raid/md_u.h>
55 #define dprintk(x...) ((void)(DEBUG && printk(x)))
59 static void autostart_arrays(int part);
62 static LIST_HEAD(pers_list);
63 static DEFINE_SPINLOCK(pers_lock);
65 static void md_print_devices(void);
67 static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
69 #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
72 * Default number of read corrections we'll attempt on an rdev
73 * before ejecting it from the array. We divide the read error
74 * count by 2 for every hour elapsed between read errors.
76 #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
78 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
79 * is 1000 KB/sec, so the extra system load does not show up that much.
80 * Increase it if you want to have more _guaranteed_ speed. Note that
81 * the RAID driver will use the maximum available bandwidth if the IO
82 * subsystem is idle. There is also an 'absolute maximum' reconstruction
83 * speed limit - in case reconstruction slows down your system despite
86 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
87 * or /sys/block/mdX/md/sync_speed_{min,max}
90 static int sysctl_speed_limit_min = 1000;
91 static int sysctl_speed_limit_max = 200000;
92 static inline int speed_min(mddev_t *mddev)
94 return mddev->sync_speed_min ?
95 mddev->sync_speed_min : sysctl_speed_limit_min;
98 static inline int speed_max(mddev_t *mddev)
100 return mddev->sync_speed_max ?
101 mddev->sync_speed_max : sysctl_speed_limit_max;
104 static struct ctl_table_header *raid_table_header;
106 static ctl_table raid_table[] = {
108 .procname = "speed_limit_min",
109 .data = &sysctl_speed_limit_min,
110 .maxlen = sizeof(int),
111 .mode = S_IRUGO|S_IWUSR,
112 .proc_handler = proc_dointvec,
115 .procname = "speed_limit_max",
116 .data = &sysctl_speed_limit_max,
117 .maxlen = sizeof(int),
118 .mode = S_IRUGO|S_IWUSR,
119 .proc_handler = proc_dointvec,
124 static ctl_table raid_dir_table[] = {
128 .mode = S_IRUGO|S_IXUGO,
134 static ctl_table raid_root_table[] = {
139 .child = raid_dir_table,
144 static const struct block_device_operations md_fops;
146 static int start_readonly;
149 * We have a system wide 'event count' that is incremented
150 * on any 'interesting' event, and readers of /proc/mdstat
151 * can use 'poll' or 'select' to find out when the event
155 * start array, stop array, error, add device, remove device,
156 * start build, activate spare
158 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
159 static atomic_t md_event_count;
160 void md_new_event(mddev_t *mddev)
162 atomic_inc(&md_event_count);
163 wake_up(&md_event_waiters);
165 EXPORT_SYMBOL_GPL(md_new_event);
167 /* Alternate version that can be called from interrupts
168 * when calling sysfs_notify isn't needed.
170 static void md_new_event_inintr(mddev_t *mddev)
172 atomic_inc(&md_event_count);
173 wake_up(&md_event_waiters);
177 * Enables to iterate over all existing md arrays
178 * all_mddevs_lock protects this list.
180 static LIST_HEAD(all_mddevs);
181 static DEFINE_SPINLOCK(all_mddevs_lock);
185 * iterates through all used mddevs in the system.
186 * We take care to grab the all_mddevs_lock whenever navigating
187 * the list, and to always hold a refcount when unlocked.
188 * Any code which breaks out of this loop while own
189 * a reference to the current mddev and must mddev_put it.
191 #define for_each_mddev(mddev,tmp) \
193 for (({ spin_lock(&all_mddevs_lock); \
194 tmp = all_mddevs.next; \
196 ({ if (tmp != &all_mddevs) \
197 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
198 spin_unlock(&all_mddevs_lock); \
199 if (mddev) mddev_put(mddev); \
200 mddev = list_entry(tmp, mddev_t, all_mddevs); \
201 tmp != &all_mddevs;}); \
202 ({ spin_lock(&all_mddevs_lock); \
207 /* Rather than calling directly into the personality make_request function,
208 * IO requests come here first so that we can check if the device is
209 * being suspended pending a reconfiguration.
210 * We hold a refcount over the call to ->make_request. By the time that
211 * call has finished, the bio has been linked into some internal structure
212 * and so is visible to ->quiesce(), so we don't need the refcount any more.
214 static int md_make_request(struct request_queue *q, struct bio *bio)
216 mddev_t *mddev = q->queuedata;
218 if (mddev == NULL || mddev->pers == NULL) {
223 if (mddev->suspended || mddev->barrier) {
226 prepare_to_wait(&mddev->sb_wait, &__wait,
227 TASK_UNINTERRUPTIBLE);
228 if (!mddev->suspended && !mddev->barrier)
234 finish_wait(&mddev->sb_wait, &__wait);
236 atomic_inc(&mddev->active_io);
238 rv = mddev->pers->make_request(q, bio);
239 if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended)
240 wake_up(&mddev->sb_wait);
245 static void mddev_suspend(mddev_t *mddev)
247 BUG_ON(mddev->suspended);
248 mddev->suspended = 1;
250 wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0);
251 mddev->pers->quiesce(mddev, 1);
252 md_unregister_thread(mddev->thread);
253 mddev->thread = NULL;
254 /* we now know that no code is executing in the personality module,
255 * except possibly the tail end of a ->bi_end_io function, but that
256 * is certain to complete before the module has a chance to get
261 static void mddev_resume(mddev_t *mddev)
263 mddev->suspended = 0;
264 wake_up(&mddev->sb_wait);
265 mddev->pers->quiesce(mddev, 0);
268 int mddev_congested(mddev_t *mddev, int bits)
272 return mddev->suspended;
274 EXPORT_SYMBOL(mddev_congested);
277 * Generic barrier handling for md
280 #define POST_REQUEST_BARRIER ((void*)1)
282 static void md_end_barrier(struct bio *bio, int err)
284 mdk_rdev_t *rdev = bio->bi_private;
285 mddev_t *mddev = rdev->mddev;
286 if (err == -EOPNOTSUPP && mddev->barrier != POST_REQUEST_BARRIER)
287 set_bit(BIO_EOPNOTSUPP, &mddev->barrier->bi_flags);
289 rdev_dec_pending(rdev, mddev);
291 if (atomic_dec_and_test(&mddev->flush_pending)) {
292 if (mddev->barrier == POST_REQUEST_BARRIER) {
293 /* This was a post-request barrier */
294 mddev->barrier = NULL;
295 wake_up(&mddev->sb_wait);
297 /* The pre-request barrier has finished */
298 schedule_work(&mddev->barrier_work);
303 static void submit_barriers(mddev_t *mddev)
308 list_for_each_entry_rcu(rdev, &mddev->disks, same_set)
309 if (rdev->raid_disk >= 0 &&
310 !test_bit(Faulty, &rdev->flags)) {
311 /* Take two references, one is dropped
312 * when request finishes, one after
313 * we reclaim rcu_read_lock
316 atomic_inc(&rdev->nr_pending);
317 atomic_inc(&rdev->nr_pending);
319 bi = bio_alloc(GFP_KERNEL, 0);
320 bi->bi_end_io = md_end_barrier;
321 bi->bi_private = rdev;
322 bi->bi_bdev = rdev->bdev;
323 atomic_inc(&mddev->flush_pending);
324 submit_bio(WRITE_BARRIER, bi);
326 rdev_dec_pending(rdev, mddev);
331 static void md_submit_barrier(struct work_struct *ws)
333 mddev_t *mddev = container_of(ws, mddev_t, barrier_work);
334 struct bio *bio = mddev->barrier;
336 atomic_set(&mddev->flush_pending, 1);
338 if (test_bit(BIO_EOPNOTSUPP, &bio->bi_flags))
339 bio_endio(bio, -EOPNOTSUPP);
340 else if (bio->bi_size == 0)
341 /* an empty barrier - all done */
344 bio->bi_rw &= ~(1<<BIO_RW_BARRIER);
345 if (mddev->pers->make_request(mddev->queue, bio))
346 generic_make_request(bio);
347 mddev->barrier = POST_REQUEST_BARRIER;
348 submit_barriers(mddev);
350 if (atomic_dec_and_test(&mddev->flush_pending)) {
351 mddev->barrier = NULL;
352 wake_up(&mddev->sb_wait);
356 void md_barrier_request(mddev_t *mddev, struct bio *bio)
358 spin_lock_irq(&mddev->write_lock);
359 wait_event_lock_irq(mddev->sb_wait,
361 mddev->write_lock, /*nothing*/);
362 mddev->barrier = bio;
363 spin_unlock_irq(&mddev->write_lock);
365 atomic_set(&mddev->flush_pending, 1);
366 INIT_WORK(&mddev->barrier_work, md_submit_barrier);
368 submit_barriers(mddev);
370 if (atomic_dec_and_test(&mddev->flush_pending))
371 schedule_work(&mddev->barrier_work);
373 EXPORT_SYMBOL(md_barrier_request);
375 static inline mddev_t *mddev_get(mddev_t *mddev)
377 atomic_inc(&mddev->active);
381 static void mddev_delayed_delete(struct work_struct *ws);
383 static void mddev_put(mddev_t *mddev)
385 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
387 if (!mddev->raid_disks && list_empty(&mddev->disks) &&
388 !mddev->hold_active) {
389 list_del(&mddev->all_mddevs);
390 if (mddev->gendisk) {
391 /* we did a probe so need to clean up.
392 * Call schedule_work inside the spinlock
393 * so that flush_scheduled_work() after
394 * mddev_find will succeed in waiting for the
397 INIT_WORK(&mddev->del_work, mddev_delayed_delete);
398 schedule_work(&mddev->del_work);
402 spin_unlock(&all_mddevs_lock);
405 static mddev_t * mddev_find(dev_t unit)
407 mddev_t *mddev, *new = NULL;
410 spin_lock(&all_mddevs_lock);
413 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
414 if (mddev->unit == unit) {
416 spin_unlock(&all_mddevs_lock);
422 list_add(&new->all_mddevs, &all_mddevs);
423 spin_unlock(&all_mddevs_lock);
424 new->hold_active = UNTIL_IOCTL;
428 /* find an unused unit number */
429 static int next_minor = 512;
430 int start = next_minor;
434 dev = MKDEV(MD_MAJOR, next_minor);
436 if (next_minor > MINORMASK)
438 if (next_minor == start) {
439 /* Oh dear, all in use. */
440 spin_unlock(&all_mddevs_lock);
446 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
447 if (mddev->unit == dev) {
453 new->md_minor = MINOR(dev);
454 new->hold_active = UNTIL_STOP;
455 list_add(&new->all_mddevs, &all_mddevs);
456 spin_unlock(&all_mddevs_lock);
459 spin_unlock(&all_mddevs_lock);
461 new = kzalloc(sizeof(*new), GFP_KERNEL);
466 if (MAJOR(unit) == MD_MAJOR)
467 new->md_minor = MINOR(unit);
469 new->md_minor = MINOR(unit) >> MdpMinorShift;
471 mutex_init(&new->open_mutex);
472 mutex_init(&new->reconfig_mutex);
473 mutex_init(&new->bitmap_info.mutex);
474 INIT_LIST_HEAD(&new->disks);
475 INIT_LIST_HEAD(&new->all_mddevs);
476 init_timer(&new->safemode_timer);
477 atomic_set(&new->active, 1);
478 atomic_set(&new->openers, 0);
479 atomic_set(&new->active_io, 0);
480 spin_lock_init(&new->write_lock);
481 atomic_set(&new->flush_pending, 0);
482 init_waitqueue_head(&new->sb_wait);
483 init_waitqueue_head(&new->recovery_wait);
484 new->reshape_position = MaxSector;
486 new->resync_max = MaxSector;
487 new->level = LEVEL_NONE;
492 static inline int mddev_lock(mddev_t * mddev)
494 return mutex_lock_interruptible(&mddev->reconfig_mutex);
497 static inline int mddev_is_locked(mddev_t *mddev)
499 return mutex_is_locked(&mddev->reconfig_mutex);
502 static inline int mddev_trylock(mddev_t * mddev)
504 return mutex_trylock(&mddev->reconfig_mutex);
507 static inline void mddev_unlock(mddev_t * mddev)
509 mutex_unlock(&mddev->reconfig_mutex);
511 md_wakeup_thread(mddev->thread);
514 static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr)
518 list_for_each_entry(rdev, &mddev->disks, same_set)
519 if (rdev->desc_nr == nr)
525 static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev)
529 list_for_each_entry(rdev, &mddev->disks, same_set)
530 if (rdev->bdev->bd_dev == dev)
536 static struct mdk_personality *find_pers(int level, char *clevel)
538 struct mdk_personality *pers;
539 list_for_each_entry(pers, &pers_list, list) {
540 if (level != LEVEL_NONE && pers->level == level)
542 if (strcmp(pers->name, clevel)==0)
548 /* return the offset of the super block in 512byte sectors */
549 static inline sector_t calc_dev_sboffset(struct block_device *bdev)
551 sector_t num_sectors = bdev->bd_inode->i_size / 512;
552 return MD_NEW_SIZE_SECTORS(num_sectors);
555 static int alloc_disk_sb(mdk_rdev_t * rdev)
560 rdev->sb_page = alloc_page(GFP_KERNEL);
561 if (!rdev->sb_page) {
562 printk(KERN_ALERT "md: out of memory.\n");
569 static void free_disk_sb(mdk_rdev_t * rdev)
572 put_page(rdev->sb_page);
574 rdev->sb_page = NULL;
581 static void super_written(struct bio *bio, int error)
583 mdk_rdev_t *rdev = bio->bi_private;
584 mddev_t *mddev = rdev->mddev;
586 if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) {
587 printk("md: super_written gets error=%d, uptodate=%d\n",
588 error, test_bit(BIO_UPTODATE, &bio->bi_flags));
589 WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags));
590 md_error(mddev, rdev);
593 if (atomic_dec_and_test(&mddev->pending_writes))
594 wake_up(&mddev->sb_wait);
598 static void super_written_barrier(struct bio *bio, int error)
600 struct bio *bio2 = bio->bi_private;
601 mdk_rdev_t *rdev = bio2->bi_private;
602 mddev_t *mddev = rdev->mddev;
604 if (!test_bit(BIO_UPTODATE, &bio->bi_flags) &&
605 error == -EOPNOTSUPP) {
607 /* barriers don't appear to be supported :-( */
608 set_bit(BarriersNotsupp, &rdev->flags);
609 mddev->barriers_work = 0;
610 spin_lock_irqsave(&mddev->write_lock, flags);
611 bio2->bi_next = mddev->biolist;
612 mddev->biolist = bio2;
613 spin_unlock_irqrestore(&mddev->write_lock, flags);
614 wake_up(&mddev->sb_wait);
618 bio->bi_private = rdev;
619 super_written(bio, error);
623 void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
624 sector_t sector, int size, struct page *page)
626 /* write first size bytes of page to sector of rdev
627 * Increment mddev->pending_writes before returning
628 * and decrement it on completion, waking up sb_wait
629 * if zero is reached.
630 * If an error occurred, call md_error
632 * As we might need to resubmit the request if BIO_RW_BARRIER
633 * causes ENOTSUPP, we allocate a spare bio...
635 struct bio *bio = bio_alloc(GFP_NOIO, 1);
636 int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNCIO) | (1<<BIO_RW_UNPLUG);
638 bio->bi_bdev = rdev->bdev;
639 bio->bi_sector = sector;
640 bio_add_page(bio, page, size, 0);
641 bio->bi_private = rdev;
642 bio->bi_end_io = super_written;
645 atomic_inc(&mddev->pending_writes);
646 if (!test_bit(BarriersNotsupp, &rdev->flags)) {
648 rw |= (1<<BIO_RW_BARRIER);
649 rbio = bio_clone(bio, GFP_NOIO);
650 rbio->bi_private = bio;
651 rbio->bi_end_io = super_written_barrier;
652 submit_bio(rw, rbio);
657 void md_super_wait(mddev_t *mddev)
659 /* wait for all superblock writes that were scheduled to complete.
660 * if any had to be retried (due to BARRIER problems), retry them
664 prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE);
665 if (atomic_read(&mddev->pending_writes)==0)
667 while (mddev->biolist) {
669 spin_lock_irq(&mddev->write_lock);
670 bio = mddev->biolist;
671 mddev->biolist = bio->bi_next ;
673 spin_unlock_irq(&mddev->write_lock);
674 submit_bio(bio->bi_rw, bio);
678 finish_wait(&mddev->sb_wait, &wq);
681 static void bi_complete(struct bio *bio, int error)
683 complete((struct completion*)bio->bi_private);
686 int sync_page_io(struct block_device *bdev, sector_t sector, int size,
687 struct page *page, int rw)
689 struct bio *bio = bio_alloc(GFP_NOIO, 1);
690 struct completion event;
693 rw |= (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_UNPLUG);
696 bio->bi_sector = sector;
697 bio_add_page(bio, page, size, 0);
698 init_completion(&event);
699 bio->bi_private = &event;
700 bio->bi_end_io = bi_complete;
702 wait_for_completion(&event);
704 ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
708 EXPORT_SYMBOL_GPL(sync_page_io);
710 static int read_disk_sb(mdk_rdev_t * rdev, int size)
712 char b[BDEVNAME_SIZE];
713 if (!rdev->sb_page) {
721 if (!sync_page_io(rdev->bdev, rdev->sb_start, size, rdev->sb_page, READ))
727 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
728 bdevname(rdev->bdev,b));
732 static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
734 return sb1->set_uuid0 == sb2->set_uuid0 &&
735 sb1->set_uuid1 == sb2->set_uuid1 &&
736 sb1->set_uuid2 == sb2->set_uuid2 &&
737 sb1->set_uuid3 == sb2->set_uuid3;
740 static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
743 mdp_super_t *tmp1, *tmp2;
745 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
746 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
748 if (!tmp1 || !tmp2) {
750 printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n");
758 * nr_disks is not constant
763 ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0);
771 static u32 md_csum_fold(u32 csum)
773 csum = (csum & 0xffff) + (csum >> 16);
774 return (csum & 0xffff) + (csum >> 16);
777 static unsigned int calc_sb_csum(mdp_super_t * sb)
780 u32 *sb32 = (u32*)sb;
782 unsigned int disk_csum, csum;
784 disk_csum = sb->sb_csum;
787 for (i = 0; i < MD_SB_BYTES/4 ; i++)
789 csum = (newcsum & 0xffffffff) + (newcsum>>32);
793 /* This used to use csum_partial, which was wrong for several
794 * reasons including that different results are returned on
795 * different architectures. It isn't critical that we get exactly
796 * the same return value as before (we always csum_fold before
797 * testing, and that removes any differences). However as we
798 * know that csum_partial always returned a 16bit value on
799 * alphas, do a fold to maximise conformity to previous behaviour.
801 sb->sb_csum = md_csum_fold(disk_csum);
803 sb->sb_csum = disk_csum;
810 * Handle superblock details.
811 * We want to be able to handle multiple superblock formats
812 * so we have a common interface to them all, and an array of
813 * different handlers.
814 * We rely on user-space to write the initial superblock, and support
815 * reading and updating of superblocks.
816 * Interface methods are:
817 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
818 * loads and validates a superblock on dev.
819 * if refdev != NULL, compare superblocks on both devices
821 * 0 - dev has a superblock that is compatible with refdev
822 * 1 - dev has a superblock that is compatible and newer than refdev
823 * so dev should be used as the refdev in future
824 * -EINVAL superblock incompatible or invalid
825 * -othererror e.g. -EIO
827 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
828 * Verify that dev is acceptable into mddev.
829 * The first time, mddev->raid_disks will be 0, and data from
830 * dev should be merged in. Subsequent calls check that dev
831 * is new enough. Return 0 or -EINVAL
833 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
834 * Update the superblock for rdev with data in mddev
835 * This does not write to disc.
841 struct module *owner;
842 int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev,
844 int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev);
845 void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev);
846 unsigned long long (*rdev_size_change)(mdk_rdev_t *rdev,
847 sector_t num_sectors);
851 * Check that the given mddev has no bitmap.
853 * This function is called from the run method of all personalities that do not
854 * support bitmaps. It prints an error message and returns non-zero if mddev
855 * has a bitmap. Otherwise, it returns 0.
858 int md_check_no_bitmap(mddev_t *mddev)
860 if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset)
862 printk(KERN_ERR "%s: bitmaps are not supported for %s\n",
863 mdname(mddev), mddev->pers->name);
866 EXPORT_SYMBOL(md_check_no_bitmap);
869 * load_super for 0.90.0
871 static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
873 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
878 * Calculate the position of the superblock (512byte sectors),
879 * it's at the end of the disk.
881 * It also happens to be a multiple of 4Kb.
883 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
885 ret = read_disk_sb(rdev, MD_SB_BYTES);
890 bdevname(rdev->bdev, b);
891 sb = (mdp_super_t*)page_address(rdev->sb_page);
893 if (sb->md_magic != MD_SB_MAGIC) {
894 printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
899 if (sb->major_version != 0 ||
900 sb->minor_version < 90 ||
901 sb->minor_version > 91) {
902 printk(KERN_WARNING "Bad version number %d.%d on %s\n",
903 sb->major_version, sb->minor_version,
908 if (sb->raid_disks <= 0)
911 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
912 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
917 rdev->preferred_minor = sb->md_minor;
918 rdev->data_offset = 0;
919 rdev->sb_size = MD_SB_BYTES;
921 if (sb->level == LEVEL_MULTIPATH)
924 rdev->desc_nr = sb->this_disk.number;
930 mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page);
931 if (!uuid_equal(refsb, sb)) {
932 printk(KERN_WARNING "md: %s has different UUID to %s\n",
933 b, bdevname(refdev->bdev,b2));
936 if (!sb_equal(refsb, sb)) {
937 printk(KERN_WARNING "md: %s has same UUID"
938 " but different superblock to %s\n",
939 b, bdevname(refdev->bdev, b2));
943 ev2 = md_event(refsb);
949 rdev->sectors = rdev->sb_start;
951 if (rdev->sectors < sb->size * 2 && sb->level > 1)
952 /* "this cannot possibly happen" ... */
960 * validate_super for 0.90.0
962 static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
965 mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page);
966 __u64 ev1 = md_event(sb);
968 rdev->raid_disk = -1;
969 clear_bit(Faulty, &rdev->flags);
970 clear_bit(In_sync, &rdev->flags);
971 clear_bit(WriteMostly, &rdev->flags);
972 clear_bit(BarriersNotsupp, &rdev->flags);
974 if (mddev->raid_disks == 0) {
975 mddev->major_version = 0;
976 mddev->minor_version = sb->minor_version;
977 mddev->patch_version = sb->patch_version;
979 mddev->chunk_sectors = sb->chunk_size >> 9;
980 mddev->ctime = sb->ctime;
981 mddev->utime = sb->utime;
982 mddev->level = sb->level;
983 mddev->clevel[0] = 0;
984 mddev->layout = sb->layout;
985 mddev->raid_disks = sb->raid_disks;
986 mddev->dev_sectors = sb->size * 2;
988 mddev->bitmap_info.offset = 0;
989 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
991 if (mddev->minor_version >= 91) {
992 mddev->reshape_position = sb->reshape_position;
993 mddev->delta_disks = sb->delta_disks;
994 mddev->new_level = sb->new_level;
995 mddev->new_layout = sb->new_layout;
996 mddev->new_chunk_sectors = sb->new_chunk >> 9;
998 mddev->reshape_position = MaxSector;
999 mddev->delta_disks = 0;
1000 mddev->new_level = mddev->level;
1001 mddev->new_layout = mddev->layout;
1002 mddev->new_chunk_sectors = mddev->chunk_sectors;
1005 if (sb->state & (1<<MD_SB_CLEAN))
1006 mddev->recovery_cp = MaxSector;
1008 if (sb->events_hi == sb->cp_events_hi &&
1009 sb->events_lo == sb->cp_events_lo) {
1010 mddev->recovery_cp = sb->recovery_cp;
1012 mddev->recovery_cp = 0;
1015 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
1016 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
1017 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
1018 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
1020 mddev->max_disks = MD_SB_DISKS;
1022 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
1023 mddev->bitmap_info.file == NULL)
1024 mddev->bitmap_info.offset =
1025 mddev->bitmap_info.default_offset;
1027 } else if (mddev->pers == NULL) {
1028 /* Insist on good event counter while assembling */
1030 if (ev1 < mddev->events)
1032 } else if (mddev->bitmap) {
1033 /* if adding to array with a bitmap, then we can accept an
1034 * older device ... but not too old.
1036 if (ev1 < mddev->bitmap->events_cleared)
1039 if (ev1 < mddev->events)
1040 /* just a hot-add of a new device, leave raid_disk at -1 */
1044 if (mddev->level != LEVEL_MULTIPATH) {
1045 desc = sb->disks + rdev->desc_nr;
1047 if (desc->state & (1<<MD_DISK_FAULTY))
1048 set_bit(Faulty, &rdev->flags);
1049 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
1050 desc->raid_disk < mddev->raid_disks */) {
1051 set_bit(In_sync, &rdev->flags);
1052 rdev->raid_disk = desc->raid_disk;
1053 } else if (desc->state & (1<<MD_DISK_ACTIVE)) {
1054 /* active but not in sync implies recovery up to
1055 * reshape position. We don't know exactly where
1056 * that is, so set to zero for now */
1057 if (mddev->minor_version >= 91) {
1058 rdev->recovery_offset = 0;
1059 rdev->raid_disk = desc->raid_disk;
1062 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
1063 set_bit(WriteMostly, &rdev->flags);
1064 } else /* MULTIPATH are always insync */
1065 set_bit(In_sync, &rdev->flags);
1070 * sync_super for 0.90.0
1072 static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1076 int next_spare = mddev->raid_disks;
1079 /* make rdev->sb match mddev data..
1082 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1083 * 3/ any empty disks < next_spare become removed
1085 * disks[0] gets initialised to REMOVED because
1086 * we cannot be sure from other fields if it has
1087 * been initialised or not.
1090 int active=0, working=0,failed=0,spare=0,nr_disks=0;
1092 rdev->sb_size = MD_SB_BYTES;
1094 sb = (mdp_super_t*)page_address(rdev->sb_page);
1096 memset(sb, 0, sizeof(*sb));
1098 sb->md_magic = MD_SB_MAGIC;
1099 sb->major_version = mddev->major_version;
1100 sb->patch_version = mddev->patch_version;
1101 sb->gvalid_words = 0; /* ignored */
1102 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
1103 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
1104 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
1105 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
1107 sb->ctime = mddev->ctime;
1108 sb->level = mddev->level;
1109 sb->size = mddev->dev_sectors / 2;
1110 sb->raid_disks = mddev->raid_disks;
1111 sb->md_minor = mddev->md_minor;
1112 sb->not_persistent = 0;
1113 sb->utime = mddev->utime;
1115 sb->events_hi = (mddev->events>>32);
1116 sb->events_lo = (u32)mddev->events;
1118 if (mddev->reshape_position == MaxSector)
1119 sb->minor_version = 90;
1121 sb->minor_version = 91;
1122 sb->reshape_position = mddev->reshape_position;
1123 sb->new_level = mddev->new_level;
1124 sb->delta_disks = mddev->delta_disks;
1125 sb->new_layout = mddev->new_layout;
1126 sb->new_chunk = mddev->new_chunk_sectors << 9;
1128 mddev->minor_version = sb->minor_version;
1131 sb->recovery_cp = mddev->recovery_cp;
1132 sb->cp_events_hi = (mddev->events>>32);
1133 sb->cp_events_lo = (u32)mddev->events;
1134 if (mddev->recovery_cp == MaxSector)
1135 sb->state = (1<< MD_SB_CLEAN);
1137 sb->recovery_cp = 0;
1139 sb->layout = mddev->layout;
1140 sb->chunk_size = mddev->chunk_sectors << 9;
1142 if (mddev->bitmap && mddev->bitmap_info.file == NULL)
1143 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
1145 sb->disks[0].state = (1<<MD_DISK_REMOVED);
1146 list_for_each_entry(rdev2, &mddev->disks, same_set) {
1149 int is_active = test_bit(In_sync, &rdev2->flags);
1151 if (rdev2->raid_disk >= 0 &&
1152 sb->minor_version >= 91)
1153 /* we have nowhere to store the recovery_offset,
1154 * but if it is not below the reshape_position,
1155 * we can piggy-back on that.
1158 if (rdev2->raid_disk < 0 ||
1159 test_bit(Faulty, &rdev2->flags))
1162 desc_nr = rdev2->raid_disk;
1164 desc_nr = next_spare++;
1165 rdev2->desc_nr = desc_nr;
1166 d = &sb->disks[rdev2->desc_nr];
1168 d->number = rdev2->desc_nr;
1169 d->major = MAJOR(rdev2->bdev->bd_dev);
1170 d->minor = MINOR(rdev2->bdev->bd_dev);
1172 d->raid_disk = rdev2->raid_disk;
1174 d->raid_disk = rdev2->desc_nr; /* compatibility */
1175 if (test_bit(Faulty, &rdev2->flags))
1176 d->state = (1<<MD_DISK_FAULTY);
1177 else if (is_active) {
1178 d->state = (1<<MD_DISK_ACTIVE);
1179 if (test_bit(In_sync, &rdev2->flags))
1180 d->state |= (1<<MD_DISK_SYNC);
1188 if (test_bit(WriteMostly, &rdev2->flags))
1189 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1191 /* now set the "removed" and "faulty" bits on any missing devices */
1192 for (i=0 ; i < mddev->raid_disks ; i++) {
1193 mdp_disk_t *d = &sb->disks[i];
1194 if (d->state == 0 && d->number == 0) {
1197 d->state = (1<<MD_DISK_REMOVED);
1198 d->state |= (1<<MD_DISK_FAULTY);
1202 sb->nr_disks = nr_disks;
1203 sb->active_disks = active;
1204 sb->working_disks = working;
1205 sb->failed_disks = failed;
1206 sb->spare_disks = spare;
1208 sb->this_disk = sb->disks[rdev->desc_nr];
1209 sb->sb_csum = calc_sb_csum(sb);
1213 * rdev_size_change for 0.90.0
1215 static unsigned long long
1216 super_90_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors)
1218 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1219 return 0; /* component must fit device */
1220 if (rdev->mddev->bitmap_info.offset)
1221 return 0; /* can't move bitmap */
1222 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
1223 if (!num_sectors || num_sectors > rdev->sb_start)
1224 num_sectors = rdev->sb_start;
1225 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1227 md_super_wait(rdev->mddev);
1228 return num_sectors / 2; /* kB for sysfs */
1233 * version 1 superblock
1236 static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb)
1240 unsigned long long newcsum;
1241 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1242 __le32 *isuper = (__le32*)sb;
1245 disk_csum = sb->sb_csum;
1248 for (i=0; size>=4; size -= 4 )
1249 newcsum += le32_to_cpu(*isuper++);
1252 newcsum += le16_to_cpu(*(__le16*) isuper);
1254 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1255 sb->sb_csum = disk_csum;
1256 return cpu_to_le32(csum);
1259 static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
1261 struct mdp_superblock_1 *sb;
1264 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1268 * Calculate the position of the superblock in 512byte sectors.
1269 * It is always aligned to a 4K boundary and
1270 * depeding on minor_version, it can be:
1271 * 0: At least 8K, but less than 12K, from end of device
1272 * 1: At start of device
1273 * 2: 4K from start of device.
1275 switch(minor_version) {
1277 sb_start = rdev->bdev->bd_inode->i_size >> 9;
1279 sb_start &= ~(sector_t)(4*2-1);
1290 rdev->sb_start = sb_start;
1292 /* superblock is rarely larger than 1K, but it can be larger,
1293 * and it is safe to read 4k, so we do that
1295 ret = read_disk_sb(rdev, 4096);
1296 if (ret) return ret;
1299 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1301 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1302 sb->major_version != cpu_to_le32(1) ||
1303 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1304 le64_to_cpu(sb->super_offset) != rdev->sb_start ||
1305 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1308 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1309 printk("md: invalid superblock checksum on %s\n",
1310 bdevname(rdev->bdev,b));
1313 if (le64_to_cpu(sb->data_size) < 10) {
1314 printk("md: data_size too small on %s\n",
1315 bdevname(rdev->bdev,b));
1319 rdev->preferred_minor = 0xffff;
1320 rdev->data_offset = le64_to_cpu(sb->data_offset);
1321 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1323 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1324 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1325 if (rdev->sb_size & bmask)
1326 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1329 && rdev->data_offset < sb_start + (rdev->sb_size/512))
1332 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1335 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1341 struct mdp_superblock_1 *refsb =
1342 (struct mdp_superblock_1*)page_address(refdev->sb_page);
1344 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1345 sb->level != refsb->level ||
1346 sb->layout != refsb->layout ||
1347 sb->chunksize != refsb->chunksize) {
1348 printk(KERN_WARNING "md: %s has strangely different"
1349 " superblock to %s\n",
1350 bdevname(rdev->bdev,b),
1351 bdevname(refdev->bdev,b2));
1354 ev1 = le64_to_cpu(sb->events);
1355 ev2 = le64_to_cpu(refsb->events);
1363 rdev->sectors = (rdev->bdev->bd_inode->i_size >> 9) -
1364 le64_to_cpu(sb->data_offset);
1366 rdev->sectors = rdev->sb_start;
1367 if (rdev->sectors < le64_to_cpu(sb->data_size))
1369 rdev->sectors = le64_to_cpu(sb->data_size);
1370 if (le64_to_cpu(sb->size) > rdev->sectors)
1375 static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
1377 struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1378 __u64 ev1 = le64_to_cpu(sb->events);
1380 rdev->raid_disk = -1;
1381 clear_bit(Faulty, &rdev->flags);
1382 clear_bit(In_sync, &rdev->flags);
1383 clear_bit(WriteMostly, &rdev->flags);
1384 clear_bit(BarriersNotsupp, &rdev->flags);
1386 if (mddev->raid_disks == 0) {
1387 mddev->major_version = 1;
1388 mddev->patch_version = 0;
1389 mddev->external = 0;
1390 mddev->chunk_sectors = le32_to_cpu(sb->chunksize);
1391 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1392 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1393 mddev->level = le32_to_cpu(sb->level);
1394 mddev->clevel[0] = 0;
1395 mddev->layout = le32_to_cpu(sb->layout);
1396 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1397 mddev->dev_sectors = le64_to_cpu(sb->size);
1398 mddev->events = ev1;
1399 mddev->bitmap_info.offset = 0;
1400 mddev->bitmap_info.default_offset = 1024 >> 9;
1402 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1403 memcpy(mddev->uuid, sb->set_uuid, 16);
1405 mddev->max_disks = (4096-256)/2;
1407 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1408 mddev->bitmap_info.file == NULL )
1409 mddev->bitmap_info.offset =
1410 (__s32)le32_to_cpu(sb->bitmap_offset);
1412 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1413 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1414 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1415 mddev->new_level = le32_to_cpu(sb->new_level);
1416 mddev->new_layout = le32_to_cpu(sb->new_layout);
1417 mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk);
1419 mddev->reshape_position = MaxSector;
1420 mddev->delta_disks = 0;
1421 mddev->new_level = mddev->level;
1422 mddev->new_layout = mddev->layout;
1423 mddev->new_chunk_sectors = mddev->chunk_sectors;
1426 } else if (mddev->pers == NULL) {
1427 /* Insist of good event counter while assembling */
1429 if (ev1 < mddev->events)
1431 } else if (mddev->bitmap) {
1432 /* If adding to array with a bitmap, then we can accept an
1433 * older device, but not too old.
1435 if (ev1 < mddev->bitmap->events_cleared)
1438 if (ev1 < mddev->events)
1439 /* just a hot-add of a new device, leave raid_disk at -1 */
1442 if (mddev->level != LEVEL_MULTIPATH) {
1444 if (rdev->desc_nr < 0 ||
1445 rdev->desc_nr >= le32_to_cpu(sb->max_dev)) {
1449 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1451 case 0xffff: /* spare */
1453 case 0xfffe: /* faulty */
1454 set_bit(Faulty, &rdev->flags);
1457 if ((le32_to_cpu(sb->feature_map) &
1458 MD_FEATURE_RECOVERY_OFFSET))
1459 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1461 set_bit(In_sync, &rdev->flags);
1462 rdev->raid_disk = role;
1465 if (sb->devflags & WriteMostly1)
1466 set_bit(WriteMostly, &rdev->flags);
1467 } else /* MULTIPATH are always insync */
1468 set_bit(In_sync, &rdev->flags);
1473 static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1475 struct mdp_superblock_1 *sb;
1478 /* make rdev->sb match mddev and rdev data. */
1480 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1482 sb->feature_map = 0;
1484 sb->recovery_offset = cpu_to_le64(0);
1485 memset(sb->pad1, 0, sizeof(sb->pad1));
1486 memset(sb->pad2, 0, sizeof(sb->pad2));
1487 memset(sb->pad3, 0, sizeof(sb->pad3));
1489 sb->utime = cpu_to_le64((__u64)mddev->utime);
1490 sb->events = cpu_to_le64(mddev->events);
1492 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1494 sb->resync_offset = cpu_to_le64(0);
1496 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
1498 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
1499 sb->size = cpu_to_le64(mddev->dev_sectors);
1500 sb->chunksize = cpu_to_le32(mddev->chunk_sectors);
1501 sb->level = cpu_to_le32(mddev->level);
1502 sb->layout = cpu_to_le32(mddev->layout);
1504 if (mddev->bitmap && mddev->bitmap_info.file == NULL) {
1505 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset);
1506 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
1509 if (rdev->raid_disk >= 0 &&
1510 !test_bit(In_sync, &rdev->flags)) {
1511 if (rdev->recovery_offset > 0) {
1513 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1514 sb->recovery_offset =
1515 cpu_to_le64(rdev->recovery_offset);
1519 if (mddev->reshape_position != MaxSector) {
1520 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1521 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1522 sb->new_layout = cpu_to_le32(mddev->new_layout);
1523 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1524 sb->new_level = cpu_to_le32(mddev->new_level);
1525 sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors);
1529 list_for_each_entry(rdev2, &mddev->disks, same_set)
1530 if (rdev2->desc_nr+1 > max_dev)
1531 max_dev = rdev2->desc_nr+1;
1533 if (max_dev > le32_to_cpu(sb->max_dev)) {
1535 sb->max_dev = cpu_to_le32(max_dev);
1536 rdev->sb_size = max_dev * 2 + 256;
1537 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1538 if (rdev->sb_size & bmask)
1539 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1541 for (i=0; i<max_dev;i++)
1542 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1544 list_for_each_entry(rdev2, &mddev->disks, same_set) {
1546 if (test_bit(Faulty, &rdev2->flags))
1547 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1548 else if (test_bit(In_sync, &rdev2->flags))
1549 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1550 else if (rdev2->raid_disk >= 0 && rdev2->recovery_offset > 0)
1551 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1553 sb->dev_roles[i] = cpu_to_le16(0xffff);
1556 sb->sb_csum = calc_sb_1_csum(sb);
1559 static unsigned long long
1560 super_1_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors)
1562 struct mdp_superblock_1 *sb;
1563 sector_t max_sectors;
1564 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1565 return 0; /* component must fit device */
1566 if (rdev->sb_start < rdev->data_offset) {
1567 /* minor versions 1 and 2; superblock before data */
1568 max_sectors = rdev->bdev->bd_inode->i_size >> 9;
1569 max_sectors -= rdev->data_offset;
1570 if (!num_sectors || num_sectors > max_sectors)
1571 num_sectors = max_sectors;
1572 } else if (rdev->mddev->bitmap_info.offset) {
1573 /* minor version 0 with bitmap we can't move */
1576 /* minor version 0; superblock after data */
1578 sb_start = (rdev->bdev->bd_inode->i_size >> 9) - 8*2;
1579 sb_start &= ~(sector_t)(4*2 - 1);
1580 max_sectors = rdev->sectors + sb_start - rdev->sb_start;
1581 if (!num_sectors || num_sectors > max_sectors)
1582 num_sectors = max_sectors;
1583 rdev->sb_start = sb_start;
1585 sb = (struct mdp_superblock_1 *) page_address(rdev->sb_page);
1586 sb->data_size = cpu_to_le64(num_sectors);
1587 sb->super_offset = rdev->sb_start;
1588 sb->sb_csum = calc_sb_1_csum(sb);
1589 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1591 md_super_wait(rdev->mddev);
1592 return num_sectors / 2; /* kB for sysfs */
1595 static struct super_type super_types[] = {
1598 .owner = THIS_MODULE,
1599 .load_super = super_90_load,
1600 .validate_super = super_90_validate,
1601 .sync_super = super_90_sync,
1602 .rdev_size_change = super_90_rdev_size_change,
1606 .owner = THIS_MODULE,
1607 .load_super = super_1_load,
1608 .validate_super = super_1_validate,
1609 .sync_super = super_1_sync,
1610 .rdev_size_change = super_1_rdev_size_change,
1614 static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)
1616 mdk_rdev_t *rdev, *rdev2;
1619 rdev_for_each_rcu(rdev, mddev1)
1620 rdev_for_each_rcu(rdev2, mddev2)
1621 if (rdev->bdev->bd_contains ==
1622 rdev2->bdev->bd_contains) {
1630 static LIST_HEAD(pending_raid_disks);
1633 * Try to register data integrity profile for an mddev
1635 * This is called when an array is started and after a disk has been kicked
1636 * from the array. It only succeeds if all working and active component devices
1637 * are integrity capable with matching profiles.
1639 int md_integrity_register(mddev_t *mddev)
1641 mdk_rdev_t *rdev, *reference = NULL;
1643 if (list_empty(&mddev->disks))
1644 return 0; /* nothing to do */
1645 if (blk_get_integrity(mddev->gendisk))
1646 return 0; /* already registered */
1647 list_for_each_entry(rdev, &mddev->disks, same_set) {
1648 /* skip spares and non-functional disks */
1649 if (test_bit(Faulty, &rdev->flags))
1651 if (rdev->raid_disk < 0)
1654 * If at least one rdev is not integrity capable, we can not
1655 * enable data integrity for the md device.
1657 if (!bdev_get_integrity(rdev->bdev))
1660 /* Use the first rdev as the reference */
1664 /* does this rdev's profile match the reference profile? */
1665 if (blk_integrity_compare(reference->bdev->bd_disk,
1666 rdev->bdev->bd_disk) < 0)
1670 * All component devices are integrity capable and have matching
1671 * profiles, register the common profile for the md device.
1673 if (blk_integrity_register(mddev->gendisk,
1674 bdev_get_integrity(reference->bdev)) != 0) {
1675 printk(KERN_ERR "md: failed to register integrity for %s\n",
1679 printk(KERN_NOTICE "md: data integrity on %s enabled\n",
1683 EXPORT_SYMBOL(md_integrity_register);
1685 /* Disable data integrity if non-capable/non-matching disk is being added */
1686 void md_integrity_add_rdev(mdk_rdev_t *rdev, mddev_t *mddev)
1688 struct blk_integrity *bi_rdev = bdev_get_integrity(rdev->bdev);
1689 struct blk_integrity *bi_mddev = blk_get_integrity(mddev->gendisk);
1691 if (!bi_mddev) /* nothing to do */
1693 if (rdev->raid_disk < 0) /* skip spares */
1695 if (bi_rdev && blk_integrity_compare(mddev->gendisk,
1696 rdev->bdev->bd_disk) >= 0)
1698 printk(KERN_NOTICE "disabling data integrity on %s\n", mdname(mddev));
1699 blk_integrity_unregister(mddev->gendisk);
1701 EXPORT_SYMBOL(md_integrity_add_rdev);
1703 static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
1705 char b[BDEVNAME_SIZE];
1715 /* prevent duplicates */
1716 if (find_rdev(mddev, rdev->bdev->bd_dev))
1719 /* make sure rdev->sectors exceeds mddev->dev_sectors */
1720 if (rdev->sectors && (mddev->dev_sectors == 0 ||
1721 rdev->sectors < mddev->dev_sectors)) {
1723 /* Cannot change size, so fail
1724 * If mddev->level <= 0, then we don't care
1725 * about aligning sizes (e.g. linear)
1727 if (mddev->level > 0)
1730 mddev->dev_sectors = rdev->sectors;
1733 /* Verify rdev->desc_nr is unique.
1734 * If it is -1, assign a free number, else
1735 * check number is not in use
1737 if (rdev->desc_nr < 0) {
1739 if (mddev->pers) choice = mddev->raid_disks;
1740 while (find_rdev_nr(mddev, choice))
1742 rdev->desc_nr = choice;
1744 if (find_rdev_nr(mddev, rdev->desc_nr))
1747 if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) {
1748 printk(KERN_WARNING "md: %s: array is limited to %d devices\n",
1749 mdname(mddev), mddev->max_disks);
1752 bdevname(rdev->bdev,b);
1753 while ( (s=strchr(b, '/')) != NULL)
1756 rdev->mddev = mddev;
1757 printk(KERN_INFO "md: bind<%s>\n", b);
1759 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
1762 ko = &part_to_dev(rdev->bdev->bd_part)->kobj;
1763 if ((err = sysfs_create_link(&rdev->kobj, ko, "block"))) {
1764 kobject_del(&rdev->kobj);
1767 rdev->sysfs_state = sysfs_get_dirent(rdev->kobj.sd, "state");
1769 list_add_rcu(&rdev->same_set, &mddev->disks);
1770 bd_claim_by_disk(rdev->bdev, rdev->bdev->bd_holder, mddev->gendisk);
1772 /* May as well allow recovery to be retried once */
1773 mddev->recovery_disabled = 0;
1778 printk(KERN_WARNING "md: failed to register dev-%s for %s\n",
1783 static void md_delayed_delete(struct work_struct *ws)
1785 mdk_rdev_t *rdev = container_of(ws, mdk_rdev_t, del_work);
1786 kobject_del(&rdev->kobj);
1787 kobject_put(&rdev->kobj);
1790 static void unbind_rdev_from_array(mdk_rdev_t * rdev)
1792 char b[BDEVNAME_SIZE];
1797 bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk);
1798 list_del_rcu(&rdev->same_set);
1799 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
1801 sysfs_remove_link(&rdev->kobj, "block");
1802 sysfs_put(rdev->sysfs_state);
1803 rdev->sysfs_state = NULL;
1804 /* We need to delay this, otherwise we can deadlock when
1805 * writing to 'remove' to "dev/state". We also need
1806 * to delay it due to rcu usage.
1809 INIT_WORK(&rdev->del_work, md_delayed_delete);
1810 kobject_get(&rdev->kobj);
1811 schedule_work(&rdev->del_work);
1815 * prevent the device from being mounted, repartitioned or
1816 * otherwise reused by a RAID array (or any other kernel
1817 * subsystem), by bd_claiming the device.
1819 static int lock_rdev(mdk_rdev_t *rdev, dev_t dev, int shared)
1822 struct block_device *bdev;
1823 char b[BDEVNAME_SIZE];
1825 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
1827 printk(KERN_ERR "md: could not open %s.\n",
1828 __bdevname(dev, b));
1829 return PTR_ERR(bdev);
1831 err = bd_claim(bdev, shared ? (mdk_rdev_t *)lock_rdev : rdev);
1833 printk(KERN_ERR "md: could not bd_claim %s.\n",
1835 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
1839 set_bit(AllReserved, &rdev->flags);
1844 static void unlock_rdev(mdk_rdev_t *rdev)
1846 struct block_device *bdev = rdev->bdev;
1851 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
1854 void md_autodetect_dev(dev_t dev);
1856 static void export_rdev(mdk_rdev_t * rdev)
1858 char b[BDEVNAME_SIZE];
1859 printk(KERN_INFO "md: export_rdev(%s)\n",
1860 bdevname(rdev->bdev,b));
1865 if (test_bit(AutoDetected, &rdev->flags))
1866 md_autodetect_dev(rdev->bdev->bd_dev);
1869 kobject_put(&rdev->kobj);
1872 static void kick_rdev_from_array(mdk_rdev_t * rdev)
1874 unbind_rdev_from_array(rdev);
1878 static void export_array(mddev_t *mddev)
1880 mdk_rdev_t *rdev, *tmp;
1882 rdev_for_each(rdev, tmp, mddev) {
1887 kick_rdev_from_array(rdev);
1889 if (!list_empty(&mddev->disks))
1891 mddev->raid_disks = 0;
1892 mddev->major_version = 0;
1895 static void print_desc(mdp_disk_t *desc)
1897 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
1898 desc->major,desc->minor,desc->raid_disk,desc->state);
1901 static void print_sb_90(mdp_super_t *sb)
1906 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1907 sb->major_version, sb->minor_version, sb->patch_version,
1908 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
1910 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1911 sb->level, sb->size, sb->nr_disks, sb->raid_disks,
1912 sb->md_minor, sb->layout, sb->chunk_size);
1913 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
1914 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1915 sb->utime, sb->state, sb->active_disks, sb->working_disks,
1916 sb->failed_disks, sb->spare_disks,
1917 sb->sb_csum, (unsigned long)sb->events_lo);
1920 for (i = 0; i < MD_SB_DISKS; i++) {
1923 desc = sb->disks + i;
1924 if (desc->number || desc->major || desc->minor ||
1925 desc->raid_disk || (desc->state && (desc->state != 4))) {
1926 printk(" D %2d: ", i);
1930 printk(KERN_INFO "md: THIS: ");
1931 print_desc(&sb->this_disk);
1934 static void print_sb_1(struct mdp_superblock_1 *sb)
1938 uuid = sb->set_uuid;
1940 "md: SB: (V:%u) (F:0x%08x) Array-ID:<%02x%02x%02x%02x"
1941 ":%02x%02x:%02x%02x:%02x%02x:%02x%02x%02x%02x%02x%02x>\n"
1942 "md: Name: \"%s\" CT:%llu\n",
1943 le32_to_cpu(sb->major_version),
1944 le32_to_cpu(sb->feature_map),
1945 uuid[0], uuid[1], uuid[2], uuid[3],
1946 uuid[4], uuid[5], uuid[6], uuid[7],
1947 uuid[8], uuid[9], uuid[10], uuid[11],
1948 uuid[12], uuid[13], uuid[14], uuid[15],
1950 (unsigned long long)le64_to_cpu(sb->ctime)
1951 & MD_SUPERBLOCK_1_TIME_SEC_MASK);
1953 uuid = sb->device_uuid;
1955 "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu"
1957 "md: Dev:%08x UUID: %02x%02x%02x%02x:%02x%02x:%02x%02x:%02x%02x"
1958 ":%02x%02x%02x%02x%02x%02x\n"
1959 "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n"
1960 "md: (MaxDev:%u) \n",
1961 le32_to_cpu(sb->level),
1962 (unsigned long long)le64_to_cpu(sb->size),
1963 le32_to_cpu(sb->raid_disks),
1964 le32_to_cpu(sb->layout),
1965 le32_to_cpu(sb->chunksize),
1966 (unsigned long long)le64_to_cpu(sb->data_offset),
1967 (unsigned long long)le64_to_cpu(sb->data_size),
1968 (unsigned long long)le64_to_cpu(sb->super_offset),
1969 (unsigned long long)le64_to_cpu(sb->recovery_offset),
1970 le32_to_cpu(sb->dev_number),
1971 uuid[0], uuid[1], uuid[2], uuid[3],
1972 uuid[4], uuid[5], uuid[6], uuid[7],
1973 uuid[8], uuid[9], uuid[10], uuid[11],
1974 uuid[12], uuid[13], uuid[14], uuid[15],
1976 (unsigned long long)le64_to_cpu(sb->utime) & MD_SUPERBLOCK_1_TIME_SEC_MASK,
1977 (unsigned long long)le64_to_cpu(sb->events),
1978 (unsigned long long)le64_to_cpu(sb->resync_offset),
1979 le32_to_cpu(sb->sb_csum),
1980 le32_to_cpu(sb->max_dev)
1984 static void print_rdev(mdk_rdev_t *rdev, int major_version)
1986 char b[BDEVNAME_SIZE];
1987 printk(KERN_INFO "md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n",
1988 bdevname(rdev->bdev, b), (unsigned long long)rdev->sectors,
1989 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
1991 if (rdev->sb_loaded) {
1992 printk(KERN_INFO "md: rdev superblock (MJ:%d):\n", major_version);
1993 switch (major_version) {
1995 print_sb_90((mdp_super_t*)page_address(rdev->sb_page));
1998 print_sb_1((struct mdp_superblock_1 *)page_address(rdev->sb_page));
2002 printk(KERN_INFO "md: no rdev superblock!\n");
2005 static void md_print_devices(void)
2007 struct list_head *tmp;
2010 char b[BDEVNAME_SIZE];
2013 printk("md: **********************************\n");
2014 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
2015 printk("md: **********************************\n");
2016 for_each_mddev(mddev, tmp) {
2019 bitmap_print_sb(mddev->bitmap);
2021 printk("%s: ", mdname(mddev));
2022 list_for_each_entry(rdev, &mddev->disks, same_set)
2023 printk("<%s>", bdevname(rdev->bdev,b));
2026 list_for_each_entry(rdev, &mddev->disks, same_set)
2027 print_rdev(rdev, mddev->major_version);
2029 printk("md: **********************************\n");
2034 static void sync_sbs(mddev_t * mddev, int nospares)
2036 /* Update each superblock (in-memory image), but
2037 * if we are allowed to, skip spares which already
2038 * have the right event counter, or have one earlier
2039 * (which would mean they aren't being marked as dirty
2040 * with the rest of the array)
2044 /* First make sure individual recovery_offsets are correct */
2045 list_for_each_entry(rdev, &mddev->disks, same_set) {
2046 if (rdev->raid_disk >= 0 &&
2047 !test_bit(In_sync, &rdev->flags) &&
2048 mddev->curr_resync_completed > rdev->recovery_offset)
2049 rdev->recovery_offset = mddev->curr_resync_completed;
2052 list_for_each_entry(rdev, &mddev->disks, same_set) {
2053 if (rdev->sb_events == mddev->events ||
2055 rdev->raid_disk < 0 &&
2056 (rdev->sb_events&1)==0 &&
2057 rdev->sb_events+1 == mddev->events)) {
2058 /* Don't update this superblock */
2059 rdev->sb_loaded = 2;
2061 super_types[mddev->major_version].
2062 sync_super(mddev, rdev);
2063 rdev->sb_loaded = 1;
2068 static void md_update_sb(mddev_t * mddev, int force_change)
2074 mddev->utime = get_seconds();
2075 if (mddev->external)
2078 spin_lock_irq(&mddev->write_lock);
2080 set_bit(MD_CHANGE_PENDING, &mddev->flags);
2081 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
2083 if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags))
2084 /* just a clean<-> dirty transition, possibly leave spares alone,
2085 * though if events isn't the right even/odd, we will have to do
2091 if (mddev->degraded)
2092 /* If the array is degraded, then skipping spares is both
2093 * dangerous and fairly pointless.
2094 * Dangerous because a device that was removed from the array
2095 * might have a event_count that still looks up-to-date,
2096 * so it can be re-added without a resync.
2097 * Pointless because if there are any spares to skip,
2098 * then a recovery will happen and soon that array won't
2099 * be degraded any more and the spare can go back to sleep then.
2103 sync_req = mddev->in_sync;
2105 /* If this is just a dirty<->clean transition, and the array is clean
2106 * and 'events' is odd, we can roll back to the previous clean state */
2108 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
2109 && (mddev->events & 1)
2110 && mddev->events != 1)
2113 /* otherwise we have to go forward and ... */
2115 if (!mddev->in_sync || mddev->recovery_cp != MaxSector) { /* not clean */
2116 /* .. if the array isn't clean, an 'even' event must also go
2118 if ((mddev->events&1)==0)
2121 /* otherwise an 'odd' event must go to spares */
2122 if ((mddev->events&1))
2127 if (!mddev->events) {
2129 * oops, this 64-bit counter should never wrap.
2130 * Either we are in around ~1 trillion A.C., assuming
2131 * 1 reboot per second, or we have a bug:
2138 * do not write anything to disk if using
2139 * nonpersistent superblocks
2141 if (!mddev->persistent) {
2142 if (!mddev->external)
2143 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2145 spin_unlock_irq(&mddev->write_lock);
2146 wake_up(&mddev->sb_wait);
2149 sync_sbs(mddev, nospares);
2150 spin_unlock_irq(&mddev->write_lock);
2153 "md: updating %s RAID superblock on device (in sync %d)\n",
2154 mdname(mddev),mddev->in_sync);
2156 bitmap_update_sb(mddev->bitmap);
2157 list_for_each_entry(rdev, &mddev->disks, same_set) {
2158 char b[BDEVNAME_SIZE];
2159 dprintk(KERN_INFO "md: ");
2160 if (rdev->sb_loaded != 1)
2161 continue; /* no noise on spare devices */
2162 if (test_bit(Faulty, &rdev->flags))
2163 dprintk("(skipping faulty ");
2165 dprintk("%s ", bdevname(rdev->bdev,b));
2166 if (!test_bit(Faulty, &rdev->flags)) {
2167 md_super_write(mddev,rdev,
2168 rdev->sb_start, rdev->sb_size,
2170 dprintk(KERN_INFO "(write) %s's sb offset: %llu\n",
2171 bdevname(rdev->bdev,b),
2172 (unsigned long long)rdev->sb_start);
2173 rdev->sb_events = mddev->events;
2177 if (mddev->level == LEVEL_MULTIPATH)
2178 /* only need to write one superblock... */
2181 md_super_wait(mddev);
2182 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2184 spin_lock_irq(&mddev->write_lock);
2185 if (mddev->in_sync != sync_req ||
2186 test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
2187 /* have to write it out again */
2188 spin_unlock_irq(&mddev->write_lock);
2191 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2192 spin_unlock_irq(&mddev->write_lock);
2193 wake_up(&mddev->sb_wait);
2194 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
2195 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
2199 /* words written to sysfs files may, or may not, be \n terminated.
2200 * We want to accept with case. For this we use cmd_match.
2202 static int cmd_match(const char *cmd, const char *str)
2204 /* See if cmd, written into a sysfs file, matches
2205 * str. They must either be the same, or cmd can
2206 * have a trailing newline
2208 while (*cmd && *str && *cmd == *str) {
2219 struct rdev_sysfs_entry {
2220 struct attribute attr;
2221 ssize_t (*show)(mdk_rdev_t *, char *);
2222 ssize_t (*store)(mdk_rdev_t *, const char *, size_t);
2226 state_show(mdk_rdev_t *rdev, char *page)
2231 if (test_bit(Faulty, &rdev->flags)) {
2232 len+= sprintf(page+len, "%sfaulty",sep);
2235 if (test_bit(In_sync, &rdev->flags)) {
2236 len += sprintf(page+len, "%sin_sync",sep);
2239 if (test_bit(WriteMostly, &rdev->flags)) {
2240 len += sprintf(page+len, "%swrite_mostly",sep);
2243 if (test_bit(Blocked, &rdev->flags)) {
2244 len += sprintf(page+len, "%sblocked", sep);
2247 if (!test_bit(Faulty, &rdev->flags) &&
2248 !test_bit(In_sync, &rdev->flags)) {
2249 len += sprintf(page+len, "%sspare", sep);
2252 return len+sprintf(page+len, "\n");
2256 state_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2259 * faulty - simulates and error
2260 * remove - disconnects the device
2261 * writemostly - sets write_mostly
2262 * -writemostly - clears write_mostly
2263 * blocked - sets the Blocked flag
2264 * -blocked - clears the Blocked flag
2265 * insync - sets Insync providing device isn't active
2268 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
2269 md_error(rdev->mddev, rdev);
2271 } else if (cmd_match(buf, "remove")) {
2272 if (rdev->raid_disk >= 0)
2275 mddev_t *mddev = rdev->mddev;
2276 kick_rdev_from_array(rdev);
2278 md_update_sb(mddev, 1);
2279 md_new_event(mddev);
2282 } else if (cmd_match(buf, "writemostly")) {
2283 set_bit(WriteMostly, &rdev->flags);
2285 } else if (cmd_match(buf, "-writemostly")) {
2286 clear_bit(WriteMostly, &rdev->flags);
2288 } else if (cmd_match(buf, "blocked")) {
2289 set_bit(Blocked, &rdev->flags);
2291 } else if (cmd_match(buf, "-blocked")) {
2292 clear_bit(Blocked, &rdev->flags);
2293 wake_up(&rdev->blocked_wait);
2294 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2295 md_wakeup_thread(rdev->mddev->thread);
2298 } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) {
2299 set_bit(In_sync, &rdev->flags);
2302 if (!err && rdev->sysfs_state)
2303 sysfs_notify_dirent(rdev->sysfs_state);
2304 return err ? err : len;
2306 static struct rdev_sysfs_entry rdev_state =
2307 __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store);
2310 errors_show(mdk_rdev_t *rdev, char *page)
2312 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
2316 errors_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2319 unsigned long n = simple_strtoul(buf, &e, 10);
2320 if (*buf && (*e == 0 || *e == '\n')) {
2321 atomic_set(&rdev->corrected_errors, n);
2326 static struct rdev_sysfs_entry rdev_errors =
2327 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
2330 slot_show(mdk_rdev_t *rdev, char *page)
2332 if (rdev->raid_disk < 0)
2333 return sprintf(page, "none\n");
2335 return sprintf(page, "%d\n", rdev->raid_disk);
2339 slot_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2344 int slot = simple_strtoul(buf, &e, 10);
2345 if (strncmp(buf, "none", 4)==0)
2347 else if (e==buf || (*e && *e!= '\n'))
2349 if (rdev->mddev->pers && slot == -1) {
2350 /* Setting 'slot' on an active array requires also
2351 * updating the 'rd%d' link, and communicating
2352 * with the personality with ->hot_*_disk.
2353 * For now we only support removing
2354 * failed/spare devices. This normally happens automatically,
2355 * but not when the metadata is externally managed.
2357 if (rdev->raid_disk == -1)
2359 /* personality does all needed checks */
2360 if (rdev->mddev->pers->hot_add_disk == NULL)
2362 err = rdev->mddev->pers->
2363 hot_remove_disk(rdev->mddev, rdev->raid_disk);
2366 sprintf(nm, "rd%d", rdev->raid_disk);
2367 sysfs_remove_link(&rdev->mddev->kobj, nm);
2368 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2369 md_wakeup_thread(rdev->mddev->thread);
2370 } else if (rdev->mddev->pers) {
2372 /* Activating a spare .. or possibly reactivating
2373 * if we ever get bitmaps working here.
2376 if (rdev->raid_disk != -1)
2379 if (rdev->mddev->pers->hot_add_disk == NULL)
2382 list_for_each_entry(rdev2, &rdev->mddev->disks, same_set)
2383 if (rdev2->raid_disk == slot)
2386 rdev->raid_disk = slot;
2387 if (test_bit(In_sync, &rdev->flags))
2388 rdev->saved_raid_disk = slot;
2390 rdev->saved_raid_disk = -1;
2391 err = rdev->mddev->pers->
2392 hot_add_disk(rdev->mddev, rdev);
2394 rdev->raid_disk = -1;
2397 sysfs_notify_dirent(rdev->sysfs_state);
2398 sprintf(nm, "rd%d", rdev->raid_disk);
2399 if (sysfs_create_link(&rdev->mddev->kobj, &rdev->kobj, nm))
2401 "md: cannot register "
2403 nm, mdname(rdev->mddev));
2405 /* don't wakeup anyone, leave that to userspace. */
2407 if (slot >= rdev->mddev->raid_disks)
2409 rdev->raid_disk = slot;
2410 /* assume it is working */
2411 clear_bit(Faulty, &rdev->flags);
2412 clear_bit(WriteMostly, &rdev->flags);
2413 set_bit(In_sync, &rdev->flags);
2414 sysfs_notify_dirent(rdev->sysfs_state);
2420 static struct rdev_sysfs_entry rdev_slot =
2421 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
2424 offset_show(mdk_rdev_t *rdev, char *page)
2426 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
2430 offset_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2433 unsigned long long offset = simple_strtoull(buf, &e, 10);
2434 if (e==buf || (*e && *e != '\n'))
2436 if (rdev->mddev->pers && rdev->raid_disk >= 0)
2438 if (rdev->sectors && rdev->mddev->external)
2439 /* Must set offset before size, so overlap checks
2442 rdev->data_offset = offset;
2446 static struct rdev_sysfs_entry rdev_offset =
2447 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
2450 rdev_size_show(mdk_rdev_t *rdev, char *page)
2452 return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2);
2455 static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
2457 /* check if two start/length pairs overlap */
2465 static int strict_blocks_to_sectors(const char *buf, sector_t *sectors)
2467 unsigned long long blocks;
2470 if (strict_strtoull(buf, 10, &blocks) < 0)
2473 if (blocks & 1ULL << (8 * sizeof(blocks) - 1))
2474 return -EINVAL; /* sector conversion overflow */
2477 if (new != blocks * 2)
2478 return -EINVAL; /* unsigned long long to sector_t overflow */
2485 rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2487 mddev_t *my_mddev = rdev->mddev;
2488 sector_t oldsectors = rdev->sectors;
2491 if (strict_blocks_to_sectors(buf, §ors) < 0)
2493 if (my_mddev->pers && rdev->raid_disk >= 0) {
2494 if (my_mddev->persistent) {
2495 sectors = super_types[my_mddev->major_version].
2496 rdev_size_change(rdev, sectors);
2499 } else if (!sectors)
2500 sectors = (rdev->bdev->bd_inode->i_size >> 9) -
2503 if (sectors < my_mddev->dev_sectors)
2504 return -EINVAL; /* component must fit device */
2506 rdev->sectors = sectors;
2507 if (sectors > oldsectors && my_mddev->external) {
2508 /* need to check that all other rdevs with the same ->bdev
2509 * do not overlap. We need to unlock the mddev to avoid
2510 * a deadlock. We have already changed rdev->sectors, and if
2511 * we have to change it back, we will have the lock again.
2515 struct list_head *tmp;
2517 mddev_unlock(my_mddev);
2518 for_each_mddev(mddev, tmp) {
2522 list_for_each_entry(rdev2, &mddev->disks, same_set)
2523 if (test_bit(AllReserved, &rdev2->flags) ||
2524 (rdev->bdev == rdev2->bdev &&
2526 overlaps(rdev->data_offset, rdev->sectors,
2532 mddev_unlock(mddev);
2538 mddev_lock(my_mddev);
2540 /* Someone else could have slipped in a size
2541 * change here, but doing so is just silly.
2542 * We put oldsectors back because we *know* it is
2543 * safe, and trust userspace not to race with
2546 rdev->sectors = oldsectors;
2553 static struct rdev_sysfs_entry rdev_size =
2554 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
2556 static struct attribute *rdev_default_attrs[] = {
2565 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
2567 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2568 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
2569 mddev_t *mddev = rdev->mddev;
2575 rv = mddev ? mddev_lock(mddev) : -EBUSY;
2577 if (rdev->mddev == NULL)
2580 rv = entry->show(rdev, page);
2581 mddev_unlock(mddev);
2587 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
2588 const char *page, size_t length)
2590 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2591 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
2593 mddev_t *mddev = rdev->mddev;
2597 if (!capable(CAP_SYS_ADMIN))
2599 rv = mddev ? mddev_lock(mddev): -EBUSY;
2601 if (rdev->mddev == NULL)
2604 rv = entry->store(rdev, page, length);
2605 mddev_unlock(mddev);
2610 static void rdev_free(struct kobject *ko)
2612 mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj);
2615 static struct sysfs_ops rdev_sysfs_ops = {
2616 .show = rdev_attr_show,
2617 .store = rdev_attr_store,
2619 static struct kobj_type rdev_ktype = {
2620 .release = rdev_free,
2621 .sysfs_ops = &rdev_sysfs_ops,
2622 .default_attrs = rdev_default_attrs,
2626 * Import a device. If 'super_format' >= 0, then sanity check the superblock
2628 * mark the device faulty if:
2630 * - the device is nonexistent (zero size)
2631 * - the device has no valid superblock
2633 * a faulty rdev _never_ has rdev->sb set.
2635 static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor)
2637 char b[BDEVNAME_SIZE];
2642 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
2644 printk(KERN_ERR "md: could not alloc mem for new device!\n");
2645 return ERR_PTR(-ENOMEM);
2648 if ((err = alloc_disk_sb(rdev)))
2651 err = lock_rdev(rdev, newdev, super_format == -2);
2655 kobject_init(&rdev->kobj, &rdev_ktype);
2658 rdev->saved_raid_disk = -1;
2659 rdev->raid_disk = -1;
2661 rdev->data_offset = 0;
2662 rdev->sb_events = 0;
2663 rdev->last_read_error.tv_sec = 0;
2664 rdev->last_read_error.tv_nsec = 0;
2665 atomic_set(&rdev->nr_pending, 0);
2666 atomic_set(&rdev->read_errors, 0);
2667 atomic_set(&rdev->corrected_errors, 0);
2669 size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
2672 "md: %s has zero or unknown size, marking faulty!\n",
2673 bdevname(rdev->bdev,b));
2678 if (super_format >= 0) {
2679 err = super_types[super_format].
2680 load_super(rdev, NULL, super_minor);
2681 if (err == -EINVAL) {
2683 "md: %s does not have a valid v%d.%d "
2684 "superblock, not importing!\n",
2685 bdevname(rdev->bdev,b),
2686 super_format, super_minor);
2691 "md: could not read %s's sb, not importing!\n",
2692 bdevname(rdev->bdev,b));
2697 INIT_LIST_HEAD(&rdev->same_set);
2698 init_waitqueue_head(&rdev->blocked_wait);
2703 if (rdev->sb_page) {
2709 return ERR_PTR(err);
2713 * Check a full RAID array for plausibility
2717 static void analyze_sbs(mddev_t * mddev)
2720 mdk_rdev_t *rdev, *freshest, *tmp;
2721 char b[BDEVNAME_SIZE];
2724 rdev_for_each(rdev, tmp, mddev)
2725 switch (super_types[mddev->major_version].
2726 load_super(rdev, freshest, mddev->minor_version)) {
2734 "md: fatal superblock inconsistency in %s"
2735 " -- removing from array\n",
2736 bdevname(rdev->bdev,b));
2737 kick_rdev_from_array(rdev);
2741 super_types[mddev->major_version].
2742 validate_super(mddev, freshest);
2745 rdev_for_each(rdev, tmp, mddev) {
2746 if (rdev->desc_nr >= mddev->max_disks ||
2747 i > mddev->max_disks) {
2749 "md: %s: %s: only %d devices permitted\n",
2750 mdname(mddev), bdevname(rdev->bdev, b),
2752 kick_rdev_from_array(rdev);
2755 if (rdev != freshest)
2756 if (super_types[mddev->major_version].
2757 validate_super(mddev, rdev)) {
2758 printk(KERN_WARNING "md: kicking non-fresh %s"
2760 bdevname(rdev->bdev,b));
2761 kick_rdev_from_array(rdev);
2764 if (mddev->level == LEVEL_MULTIPATH) {
2765 rdev->desc_nr = i++;
2766 rdev->raid_disk = rdev->desc_nr;
2767 set_bit(In_sync, &rdev->flags);
2768 } else if (rdev->raid_disk >= (mddev->raid_disks - min(0, mddev->delta_disks))) {
2769 rdev->raid_disk = -1;
2770 clear_bit(In_sync, &rdev->flags);
2775 /* Read a fixed-point number.
2776 * Numbers in sysfs attributes should be in "standard" units where
2777 * possible, so time should be in seconds.
2778 * However we internally use a a much smaller unit such as
2779 * milliseconds or jiffies.
2780 * This function takes a decimal number with a possible fractional
2781 * component, and produces an integer which is the result of
2782 * multiplying that number by 10^'scale'.
2783 * all without any floating-point arithmetic.
2785 int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale)
2787 unsigned long result = 0;
2789 while (isdigit(*cp) || (*cp == '.' && decimals < 0)) {
2792 else if (decimals < scale) {
2795 result = result * 10 + value;
2807 while (decimals < scale) {
2816 static void md_safemode_timeout(unsigned long data);
2819 safe_delay_show(mddev_t *mddev, char *page)
2821 int msec = (mddev->safemode_delay*1000)/HZ;
2822 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
2825 safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len)
2829 if (strict_strtoul_scaled(cbuf, &msec, 3) < 0)
2832 mddev->safemode_delay = 0;
2834 unsigned long old_delay = mddev->safemode_delay;
2835 mddev->safemode_delay = (msec*HZ)/1000;
2836 if (mddev->safemode_delay == 0)
2837 mddev->safemode_delay = 1;
2838 if (mddev->safemode_delay < old_delay)
2839 md_safemode_timeout((unsigned long)mddev);
2843 static struct md_sysfs_entry md_safe_delay =
2844 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
2847 level_show(mddev_t *mddev, char *page)
2849 struct mdk_personality *p = mddev->pers;
2851 return sprintf(page, "%s\n", p->name);
2852 else if (mddev->clevel[0])
2853 return sprintf(page, "%s\n", mddev->clevel);
2854 else if (mddev->level != LEVEL_NONE)
2855 return sprintf(page, "%d\n", mddev->level);
2861 level_store(mddev_t *mddev, const char *buf, size_t len)
2865 struct mdk_personality *pers;
2869 if (mddev->pers == NULL) {
2872 if (len >= sizeof(mddev->clevel))
2874 strncpy(mddev->clevel, buf, len);
2875 if (mddev->clevel[len-1] == '\n')
2877 mddev->clevel[len] = 0;
2878 mddev->level = LEVEL_NONE;
2882 /* request to change the personality. Need to ensure:
2883 * - array is not engaged in resync/recovery/reshape
2884 * - old personality can be suspended
2885 * - new personality will access other array.
2888 if (mddev->sync_thread || mddev->reshape_position != MaxSector)
2891 if (!mddev->pers->quiesce) {
2892 printk(KERN_WARNING "md: %s: %s does not support online personality change\n",
2893 mdname(mddev), mddev->pers->name);
2897 /* Now find the new personality */
2898 if (len == 0 || len >= sizeof(level))
2900 strncpy(level, buf, len);
2901 if (level[len-1] == '\n')
2905 request_module("md-%s", level);
2906 spin_lock(&pers_lock);
2907 pers = find_pers(LEVEL_NONE, level);
2908 if (!pers || !try_module_get(pers->owner)) {
2909 spin_unlock(&pers_lock);
2910 printk(KERN_WARNING "md: personality %s not loaded\n", level);
2913 spin_unlock(&pers_lock);
2915 if (pers == mddev->pers) {
2916 /* Nothing to do! */
2917 module_put(pers->owner);
2920 if (!pers->takeover) {
2921 module_put(pers->owner);
2922 printk(KERN_WARNING "md: %s: %s does not support personality takeover\n",
2923 mdname(mddev), level);
2927 /* ->takeover must set new_* and/or delta_disks
2928 * if it succeeds, and may set them when it fails.
2930 priv = pers->takeover(mddev);
2932 mddev->new_level = mddev->level;
2933 mddev->new_layout = mddev->layout;
2934 mddev->new_chunk_sectors = mddev->chunk_sectors;
2935 mddev->raid_disks -= mddev->delta_disks;
2936 mddev->delta_disks = 0;
2937 module_put(pers->owner);
2938 printk(KERN_WARNING "md: %s: %s would not accept array\n",
2939 mdname(mddev), level);
2940 return PTR_ERR(priv);
2943 /* Looks like we have a winner */
2944 mddev_suspend(mddev);
2945 mddev->pers->stop(mddev);
2946 module_put(mddev->pers->owner);
2947 /* Invalidate devices that are now superfluous */
2948 list_for_each_entry(rdev, &mddev->disks, same_set)
2949 if (rdev->raid_disk >= mddev->raid_disks) {
2950 rdev->raid_disk = -1;
2951 clear_bit(In_sync, &rdev->flags);
2954 mddev->private = priv;
2955 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
2956 mddev->level = mddev->new_level;
2957 mddev->layout = mddev->new_layout;
2958 mddev->chunk_sectors = mddev->new_chunk_sectors;
2959 mddev->delta_disks = 0;
2961 mddev_resume(mddev);
2962 set_bit(MD_CHANGE_DEVS, &mddev->flags);
2963 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2964 md_wakeup_thread(mddev->thread);
2968 static struct md_sysfs_entry md_level =
2969 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
2973 layout_show(mddev_t *mddev, char *page)
2975 /* just a number, not meaningful for all levels */
2976 if (mddev->reshape_position != MaxSector &&
2977 mddev->layout != mddev->new_layout)
2978 return sprintf(page, "%d (%d)\n",
2979 mddev->new_layout, mddev->layout);
2980 return sprintf(page, "%d\n", mddev->layout);
2984 layout_store(mddev_t *mddev, const char *buf, size_t len)
2987 unsigned long n = simple_strtoul(buf, &e, 10);
2989 if (!*buf || (*e && *e != '\n'))
2994 if (mddev->pers->check_reshape == NULL)
2996 mddev->new_layout = n;
2997 err = mddev->pers->check_reshape(mddev);
2999 mddev->new_layout = mddev->layout;
3003 mddev->new_layout = n;
3004 if (mddev->reshape_position == MaxSector)
3009 static struct md_sysfs_entry md_layout =
3010 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
3014 raid_disks_show(mddev_t *mddev, char *page)
3016 if (mddev->raid_disks == 0)
3018 if (mddev->reshape_position != MaxSector &&
3019 mddev->delta_disks != 0)
3020 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
3021 mddev->raid_disks - mddev->delta_disks);
3022 return sprintf(page, "%d\n", mddev->raid_disks);
3025 static int update_raid_disks(mddev_t *mddev, int raid_disks);
3028 raid_disks_store(mddev_t *mddev, const char *buf, size_t len)
3032 unsigned long n = simple_strtoul(buf, &e, 10);
3034 if (!*buf || (*e && *e != '\n'))
3038 rv = update_raid_disks(mddev, n);
3039 else if (mddev->reshape_position != MaxSector) {
3040 int olddisks = mddev->raid_disks - mddev->delta_disks;
3041 mddev->delta_disks = n - olddisks;
3042 mddev->raid_disks = n;
3044 mddev->raid_disks = n;
3045 return rv ? rv : len;
3047 static struct md_sysfs_entry md_raid_disks =
3048 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
3051 chunk_size_show(mddev_t *mddev, char *page)
3053 if (mddev->reshape_position != MaxSector &&
3054 mddev->chunk_sectors != mddev->new_chunk_sectors)
3055 return sprintf(page, "%d (%d)\n",
3056 mddev->new_chunk_sectors << 9,
3057 mddev->chunk_sectors << 9);
3058 return sprintf(page, "%d\n", mddev->chunk_sectors << 9);
3062 chunk_size_store(mddev_t *mddev, const char *buf, size_t len)
3065 unsigned long n = simple_strtoul(buf, &e, 10);
3067 if (!*buf || (*e && *e != '\n'))
3072 if (mddev->pers->check_reshape == NULL)
3074 mddev->new_chunk_sectors = n >> 9;
3075 err = mddev->pers->check_reshape(mddev);
3077 mddev->new_chunk_sectors = mddev->chunk_sectors;
3081 mddev->new_chunk_sectors = n >> 9;
3082 if (mddev->reshape_position == MaxSector)
3083 mddev->chunk_sectors = n >> 9;
3087 static struct md_sysfs_entry md_chunk_size =
3088 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
3091 resync_start_show(mddev_t *mddev, char *page)
3093 if (mddev->recovery_cp == MaxSector)
3094 return sprintf(page, "none\n");
3095 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
3099 resync_start_store(mddev_t *mddev, const char *buf, size_t len)
3102 unsigned long long n = simple_strtoull(buf, &e, 10);
3106 if (!*buf || (*e && *e != '\n'))
3109 mddev->recovery_cp = n;
3112 static struct md_sysfs_entry md_resync_start =
3113 __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store);
3116 * The array state can be:
3119 * No devices, no size, no level
3120 * Equivalent to STOP_ARRAY ioctl
3122 * May have some settings, but array is not active
3123 * all IO results in error
3124 * When written, doesn't tear down array, but just stops it
3125 * suspended (not supported yet)
3126 * All IO requests will block. The array can be reconfigured.
3127 * Writing this, if accepted, will block until array is quiescent
3129 * no resync can happen. no superblocks get written.
3130 * write requests fail
3132 * like readonly, but behaves like 'clean' on a write request.
3134 * clean - no pending writes, but otherwise active.
3135 * When written to inactive array, starts without resync
3136 * If a write request arrives then
3137 * if metadata is known, mark 'dirty' and switch to 'active'.
3138 * if not known, block and switch to write-pending
3139 * If written to an active array that has pending writes, then fails.
3141 * fully active: IO and resync can be happening.
3142 * When written to inactive array, starts with resync
3145 * clean, but writes are blocked waiting for 'active' to be written.
3148 * like active, but no writes have been seen for a while (100msec).
3151 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
3152 write_pending, active_idle, bad_word};
3153 static char *array_states[] = {
3154 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3155 "write-pending", "active-idle", NULL };
3157 static int match_word(const char *word, char **list)
3160 for (n=0; list[n]; n++)
3161 if (cmd_match(word, list[n]))
3167 array_state_show(mddev_t *mddev, char *page)
3169 enum array_state st = inactive;
3182 else if (test_bit(MD_CHANGE_CLEAN, &mddev->flags))
3184 else if (mddev->safemode)
3190 if (list_empty(&mddev->disks) &&
3191 mddev->raid_disks == 0 &&
3192 mddev->dev_sectors == 0)
3197 return sprintf(page, "%s\n", array_states[st]);
3200 static int do_md_stop(mddev_t * mddev, int ro, int is_open);
3201 static int do_md_run(mddev_t * mddev);
3202 static int restart_array(mddev_t *mddev);
3205 array_state_store(mddev_t *mddev, const char *buf, size_t len)
3208 enum array_state st = match_word(buf, array_states);
3213 /* stopping an active array */
3214 if (atomic_read(&mddev->openers) > 0)
3216 err = do_md_stop(mddev, 0, 0);
3219 /* stopping an active array */
3221 if (atomic_read(&mddev->openers) > 0)
3223 err = do_md_stop(mddev, 2, 0);
3225 err = 0; /* already inactive */
3228 break; /* not supported yet */
3231 err = do_md_stop(mddev, 1, 0);
3234 set_disk_ro(mddev->gendisk, 1);
3235 err = do_md_run(mddev);
3241 err = do_md_stop(mddev, 1, 0);
3242 else if (mddev->ro == 1)
3243 err = restart_array(mddev);
3246 set_disk_ro(mddev->gendisk, 0);
3250 err = do_md_run(mddev);
3255 restart_array(mddev);
3256 spin_lock_irq(&mddev->write_lock);
3257 if (atomic_read(&mddev->writes_pending) == 0) {
3258 if (mddev->in_sync == 0) {
3260 if (mddev->safemode == 1)
3261 mddev->safemode = 0;
3262 if (mddev->persistent)
3263 set_bit(MD_CHANGE_CLEAN,
3269 spin_unlock_irq(&mddev->write_lock);
3275 restart_array(mddev);
3276 if (mddev->external)
3277 clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
3278 wake_up(&mddev->sb_wait);
3282 set_disk_ro(mddev->gendisk, 0);
3283 err = do_md_run(mddev);
3288 /* these cannot be set */
3294 sysfs_notify_dirent(mddev->sysfs_state);
3298 static struct md_sysfs_entry md_array_state =
3299 __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
3302 max_corrected_read_errors_show(mddev_t *mddev, char *page) {
3303 return sprintf(page, "%d\n",
3304 atomic_read(&mddev->max_corr_read_errors));
3308 max_corrected_read_errors_store(mddev_t *mddev, const char *buf, size_t len)
3311 unsigned long n = simple_strtoul(buf, &e, 10);
3313 if (*buf && (*e == 0 || *e == '\n')) {
3314 atomic_set(&mddev->max_corr_read_errors, n);
3320 static struct md_sysfs_entry max_corr_read_errors =
3321 __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show,
3322 max_corrected_read_errors_store);
3325 null_show(mddev_t *mddev, char *page)
3331 new_dev_store(mddev_t *mddev, const char *buf, size_t len)
3333 /* buf must be %d:%d\n? giving major and minor numbers */
3334 /* The new device is added to the array.
3335 * If the array has a persistent superblock, we read the
3336 * superblock to initialise info and check validity.
3337 * Otherwise, only checking done is that in bind_rdev_to_array,
3338 * which mainly checks size.
3341 int major = simple_strtoul(buf, &e, 10);
3347 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
3349 minor = simple_strtoul(e+1, &e, 10);
3350 if (*e && *e != '\n')
3352 dev = MKDEV(major, minor);
3353 if (major != MAJOR(dev) ||
3354 minor != MINOR(dev))
3358 if (mddev->persistent) {
3359 rdev = md_import_device(dev, mddev->major_version,
3360 mddev->minor_version);
3361 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
3362 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
3363 mdk_rdev_t, same_set);
3364 err = super_types[mddev->major_version]
3365 .load_super(rdev, rdev0, mddev->minor_version);
3369 } else if (mddev->external)
3370 rdev = md_import_device(dev, -2, -1);
3372 rdev = md_import_device(dev, -1, -1);
3375 return PTR_ERR(rdev);
3376 err = bind_rdev_to_array(rdev, mddev);
3380 return err ? err : len;
3383 static struct md_sysfs_entry md_new_device =
3384 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
3387 bitmap_store(mddev_t *mddev, const char *buf, size_t len)
3390 unsigned long chunk, end_chunk;
3394 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
3396 chunk = end_chunk = simple_strtoul(buf, &end, 0);
3397 if (buf == end) break;
3398 if (*end == '-') { /* range */
3400 end_chunk = simple_strtoul(buf, &end, 0);
3401 if (buf == end) break;
3403 if (*end && !isspace(*end)) break;
3404 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
3406 while (isspace(*buf)) buf++;
3408 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
3413 static struct md_sysfs_entry md_bitmap =
3414 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
3417 size_show(mddev_t *mddev, char *page)
3419 return sprintf(page, "%llu\n",
3420 (unsigned long long)mddev->dev_sectors / 2);
3423 static int update_size(mddev_t *mddev, sector_t num_sectors);
3426 size_store(mddev_t *mddev, const char *buf, size_t len)
3428 /* If array is inactive, we can reduce the component size, but
3429 * not increase it (except from 0).
3430 * If array is active, we can try an on-line resize
3433 int err = strict_blocks_to_sectors(buf, §ors);
3438 err = update_size(mddev, sectors);
3439 md_update_sb(mddev, 1);
3441 if (mddev->dev_sectors == 0 ||
3442 mddev->dev_sectors > sectors)
3443 mddev->dev_sectors = sectors;
3447 return err ? err : len;
3450 static struct md_sysfs_entry md_size =
3451 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
3456 * 'none' for arrays with no metadata (good luck...)
3457 * 'external' for arrays with externally managed metadata,
3458 * or N.M for internally known formats
3461 metadata_show(mddev_t *mddev, char *page)
3463 if (mddev->persistent)
3464 return sprintf(page, "%d.%d\n",
3465 mddev->major_version, mddev->minor_version);
3466 else if (mddev->external)
3467 return sprintf(page, "external:%s\n", mddev->metadata_type);
3469 return sprintf(page, "none\n");
3473 metadata_store(mddev_t *mddev, const char *buf, size_t len)
3477 /* Changing the details of 'external' metadata is
3478 * always permitted. Otherwise there must be
3479 * no devices attached to the array.
3481 if (mddev->external && strncmp(buf, "external:", 9) == 0)
3483 else if (!list_empty(&mddev->disks))
3486 if (cmd_match(buf, "none")) {
3487 mddev->persistent = 0;
3488 mddev->external = 0;
3489 mddev->major_version = 0;
3490 mddev->minor_version = 90;
3493 if (strncmp(buf, "external:", 9) == 0) {
3494 size_t namelen = len-9;
3495 if (namelen >= sizeof(mddev->metadata_type))
3496 namelen = sizeof(mddev->metadata_type)-1;
3497 strncpy(mddev->metadata_type, buf+9, namelen);
3498 mddev->metadata_type[namelen] = 0;
3499 if (namelen && mddev->metadata_type[namelen-1] == '\n')
3500 mddev->metadata_type[--namelen] = 0;
3501 mddev->persistent = 0;
3502 mddev->external = 1;
3503 mddev->major_version = 0;
3504 mddev->minor_version = 90;
3507 major = simple_strtoul(buf, &e, 10);
3508 if (e==buf || *e != '.')
3511 minor = simple_strtoul(buf, &e, 10);
3512 if (e==buf || (*e && *e != '\n') )
3514 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
3516 mddev->major_version = major;
3517 mddev->minor_version = minor;
3518 mddev->persistent = 1;
3519 mddev->external = 0;
3523 static struct md_sysfs_entry md_metadata =
3524 __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
3527 action_show(mddev_t *mddev, char *page)
3529 char *type = "idle";
3530 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
3532 else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3533 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) {
3534 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
3536 else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
3537 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
3539 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
3543 } else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
3546 return sprintf(page, "%s\n", type);
3550 action_store(mddev_t *mddev, const char *page, size_t len)
3552 if (!mddev->pers || !mddev->pers->sync_request)
3555 if (cmd_match(page, "frozen"))
3556 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3558 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3560 if (cmd_match(page, "idle") || cmd_match(page, "frozen")) {
3561 if (mddev->sync_thread) {
3562 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
3563 md_unregister_thread(mddev->sync_thread);
3564 mddev->sync_thread = NULL;
3565 mddev->recovery = 0;
3567 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3568 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
3570 else if (cmd_match(page, "resync"))
3571 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3572 else if (cmd_match(page, "recover")) {
3573 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
3574 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3575 } else if (cmd_match(page, "reshape")) {
3577 if (mddev->pers->start_reshape == NULL)
3579 err = mddev->pers->start_reshape(mddev);
3582 sysfs_notify(&mddev->kobj, NULL, "degraded");
3584 if (cmd_match(page, "check"))
3585 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
3586 else if (!cmd_match(page, "repair"))
3588 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
3589 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
3591 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3592 md_wakeup_thread(mddev->thread);
3593 sysfs_notify_dirent(mddev->sysfs_action);
3598 mismatch_cnt_show(mddev_t *mddev, char *page)
3600 return sprintf(page, "%llu\n",
3601 (unsigned long long) mddev->resync_mismatches);
3604 static struct md_sysfs_entry md_scan_mode =
3605 __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
3608 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
3611 sync_min_show(mddev_t *mddev, char *page)
3613 return sprintf(page, "%d (%s)\n", speed_min(mddev),
3614 mddev->sync_speed_min ? "local": "system");
3618 sync_min_store(mddev_t *mddev, const char *buf, size_t len)
3622 if (strncmp(buf, "system", 6)==0) {
3623 mddev->sync_speed_min = 0;
3626 min = simple_strtoul(buf, &e, 10);
3627 if (buf == e || (*e && *e != '\n') || min <= 0)
3629 mddev->sync_speed_min = min;
3633 static struct md_sysfs_entry md_sync_min =
3634 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
3637 sync_max_show(mddev_t *mddev, char *page)
3639 return sprintf(page, "%d (%s)\n", speed_max(mddev),
3640 mddev->sync_speed_max ? "local": "system");
3644 sync_max_store(mddev_t *mddev, const char *buf, size_t len)
3648 if (strncmp(buf, "system", 6)==0) {
3649 mddev->sync_speed_max = 0;
3652 max = simple_strtoul(buf, &e, 10);
3653 if (buf == e || (*e && *e != '\n') || max <= 0)
3655 mddev->sync_speed_max = max;
3659 static struct md_sysfs_entry md_sync_max =
3660 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
3663 degraded_show(mddev_t *mddev, char *page)
3665 return sprintf(page, "%d\n", mddev->degraded);
3667 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
3670 sync_force_parallel_show(mddev_t *mddev, char *page)
3672 return sprintf(page, "%d\n", mddev->parallel_resync);
3676 sync_force_parallel_store(mddev_t *mddev, const char *buf, size_t len)
3680 if (strict_strtol(buf, 10, &n))
3683 if (n != 0 && n != 1)
3686 mddev->parallel_resync = n;
3688 if (mddev->sync_thread)
3689 wake_up(&resync_wait);
3694 /* force parallel resync, even with shared block devices */
3695 static struct md_sysfs_entry md_sync_force_parallel =
3696 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
3697 sync_force_parallel_show, sync_force_parallel_store);
3700 sync_speed_show(mddev_t *mddev, char *page)
3702 unsigned long resync, dt, db;
3703 if (mddev->curr_resync == 0)
3704 return sprintf(page, "none\n");
3705 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
3706 dt = (jiffies - mddev->resync_mark) / HZ;
3708 db = resync - mddev->resync_mark_cnt;
3709 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
3712 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
3715 sync_completed_show(mddev_t *mddev, char *page)
3717 unsigned long max_sectors, resync;
3719 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3720 return sprintf(page, "none\n");
3722 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
3723 max_sectors = mddev->resync_max_sectors;
3725 max_sectors = mddev->dev_sectors;
3727 resync = mddev->curr_resync_completed;
3728 return sprintf(page, "%lu / %lu\n", resync, max_sectors);
3731 static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed);
3734 min_sync_show(mddev_t *mddev, char *page)
3736 return sprintf(page, "%llu\n",
3737 (unsigned long long)mddev->resync_min);
3740 min_sync_store(mddev_t *mddev, const char *buf, size_t len)
3742 unsigned long long min;
3743 if (strict_strtoull(buf, 10, &min))
3745 if (min > mddev->resync_max)
3747 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3750 /* Must be a multiple of chunk_size */
3751 if (mddev->chunk_sectors) {
3752 sector_t temp = min;
3753 if (sector_div(temp, mddev->chunk_sectors))
3756 mddev->resync_min = min;
3761 static struct md_sysfs_entry md_min_sync =
3762 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
3765 max_sync_show(mddev_t *mddev, char *page)
3767 if (mddev->resync_max == MaxSector)
3768 return sprintf(page, "max\n");
3770 return sprintf(page, "%llu\n",
3771 (unsigned long long)mddev->resync_max);
3774 max_sync_store(mddev_t *mddev, const char *buf, size_t len)
3776 if (strncmp(buf, "max", 3) == 0)
3777 mddev->resync_max = MaxSector;
3779 unsigned long long max;
3780 if (strict_strtoull(buf, 10, &max))
3782 if (max < mddev->resync_min)
3784 if (max < mddev->resync_max &&
3786 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3789 /* Must be a multiple of chunk_size */
3790 if (mddev->chunk_sectors) {
3791 sector_t temp = max;
3792 if (sector_div(temp, mddev->chunk_sectors))
3795 mddev->resync_max = max;
3797 wake_up(&mddev->recovery_wait);
3801 static struct md_sysfs_entry md_max_sync =
3802 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
3805 suspend_lo_show(mddev_t *mddev, char *page)
3807 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
3811 suspend_lo_store(mddev_t *mddev, const char *buf, size_t len)
3814 unsigned long long new = simple_strtoull(buf, &e, 10);
3816 if (mddev->pers == NULL ||
3817 mddev->pers->quiesce == NULL)
3819 if (buf == e || (*e && *e != '\n'))
3821 if (new >= mddev->suspend_hi ||
3822 (new > mddev->suspend_lo && new < mddev->suspend_hi)) {
3823 mddev->suspend_lo = new;
3824 mddev->pers->quiesce(mddev, 2);
3829 static struct md_sysfs_entry md_suspend_lo =
3830 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
3834 suspend_hi_show(mddev_t *mddev, char *page)
3836 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
3840 suspend_hi_store(mddev_t *mddev, const char *buf, size_t len)
3843 unsigned long long new = simple_strtoull(buf, &e, 10);
3845 if (mddev->pers == NULL ||
3846 mddev->pers->quiesce == NULL)
3848 if (buf == e || (*e && *e != '\n'))
3850 if ((new <= mddev->suspend_lo && mddev->suspend_lo >= mddev->suspend_hi) ||
3851 (new > mddev->suspend_lo && new > mddev->suspend_hi)) {
3852 mddev->suspend_hi = new;
3853 mddev->pers->quiesce(mddev, 1);
3854 mddev->pers->quiesce(mddev, 0);
3859 static struct md_sysfs_entry md_suspend_hi =
3860 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
3863 reshape_position_show(mddev_t *mddev, char *page)
3865 if (mddev->reshape_position != MaxSector)
3866 return sprintf(page, "%llu\n",
3867 (unsigned long long)mddev->reshape_position);
3868 strcpy(page, "none\n");
3873 reshape_position_store(mddev_t *mddev, const char *buf, size_t len)
3876 unsigned long long new = simple_strtoull(buf, &e, 10);
3879 if (buf == e || (*e && *e != '\n'))
3881 mddev->reshape_position = new;
3882 mddev->delta_disks = 0;
3883 mddev->new_level = mddev->level;
3884 mddev->new_layout = mddev->layout;
3885 mddev->new_chunk_sectors = mddev->chunk_sectors;
3889 static struct md_sysfs_entry md_reshape_position =
3890 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
3891 reshape_position_store);
3894 array_size_show(mddev_t *mddev, char *page)
3896 if (mddev->external_size)
3897 return sprintf(page, "%llu\n",
3898 (unsigned long long)mddev->array_sectors/2);
3900 return sprintf(page, "default\n");
3904 array_size_store(mddev_t *mddev, const char *buf, size_t len)
3908 if (strncmp(buf, "default", 7) == 0) {
3910 sectors = mddev->pers->size(mddev, 0, 0);
3912 sectors = mddev->array_sectors;
3914 mddev->external_size = 0;
3916 if (strict_blocks_to_sectors(buf, §ors) < 0)
3918 if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors)
3921 mddev->external_size = 1;
3924 mddev->array_sectors = sectors;
3925 set_capacity(mddev->gendisk, mddev->array_sectors);
3927 revalidate_disk(mddev->gendisk);
3932 static struct md_sysfs_entry md_array_size =
3933 __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show,
3936 static struct attribute *md_default_attrs[] = {
3939 &md_raid_disks.attr,
3940 &md_chunk_size.attr,
3942 &md_resync_start.attr,
3944 &md_new_device.attr,
3945 &md_safe_delay.attr,
3946 &md_array_state.attr,
3947 &md_reshape_position.attr,
3948 &md_array_size.attr,
3949 &max_corr_read_errors.attr,
3953 static struct attribute *md_redundancy_attrs[] = {
3955 &md_mismatches.attr,
3958 &md_sync_speed.attr,
3959 &md_sync_force_parallel.attr,
3960 &md_sync_completed.attr,
3963 &md_suspend_lo.attr,
3964 &md_suspend_hi.attr,
3969 static struct attribute_group md_redundancy_group = {
3971 .attrs = md_redundancy_attrs,
3976 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
3978 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
3979 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
3984 rv = mddev_lock(mddev);
3986 rv = entry->show(mddev, page);
3987 mddev_unlock(mddev);
3993 md_attr_store(struct kobject *kobj, struct attribute *attr,
3994 const char *page, size_t length)
3996 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
3997 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
4002 if (!capable(CAP_SYS_ADMIN))
4004 rv = mddev_lock(mddev);
4005 if (mddev->hold_active == UNTIL_IOCTL)
4006 mddev->hold_active = 0;
4008 rv = entry->store(mddev, page, length);
4009 mddev_unlock(mddev);
4014 static void md_free(struct kobject *ko)
4016 mddev_t *mddev = container_of(ko, mddev_t, kobj);
4018 if (mddev->sysfs_state)
4019 sysfs_put(mddev->sysfs_state);
4021 if (mddev->gendisk) {
4022 del_gendisk(mddev->gendisk);
4023 put_disk(mddev->gendisk);
4026 blk_cleanup_queue(mddev->queue);
4031 static struct sysfs_ops md_sysfs_ops = {
4032 .show = md_attr_show,
4033 .store = md_attr_store,
4035 static struct kobj_type md_ktype = {
4037 .sysfs_ops = &md_sysfs_ops,
4038 .default_attrs = md_default_attrs,
4043 static void mddev_delayed_delete(struct work_struct *ws)
4045 mddev_t *mddev = container_of(ws, mddev_t, del_work);
4047 if (mddev->private == &md_redundancy_group) {
4048 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
4049 if (mddev->sysfs_action)
4050 sysfs_put(mddev->sysfs_action);
4051 mddev->sysfs_action = NULL;
4052 mddev->private = NULL;
4054 sysfs_remove_group(&mddev->kobj, &md_bitmap_group);
4055 kobject_del(&mddev->kobj);
4056 kobject_put(&mddev->kobj);
4059 static int md_alloc(dev_t dev, char *name)
4061 static DEFINE_MUTEX(disks_mutex);
4062 mddev_t *mddev = mddev_find(dev);
4063 struct gendisk *disk;
4072 partitioned = (MAJOR(mddev->unit) != MD_MAJOR);
4073 shift = partitioned ? MdpMinorShift : 0;
4074 unit = MINOR(mddev->unit) >> shift;
4076 /* wait for any previous instance if this device
4077 * to be completed removed (mddev_delayed_delete).
4079 flush_scheduled_work();
4081 mutex_lock(&disks_mutex);
4087 /* Need to ensure that 'name' is not a duplicate.
4090 spin_lock(&all_mddevs_lock);
4092 list_for_each_entry(mddev2, &all_mddevs, all_mddevs)
4093 if (mddev2->gendisk &&
4094 strcmp(mddev2->gendisk->disk_name, name) == 0) {
4095 spin_unlock(&all_mddevs_lock);
4098 spin_unlock(&all_mddevs_lock);
4102 mddev->queue = blk_alloc_queue(GFP_KERNEL);
4105 mddev->queue->queuedata = mddev;
4107 /* Can be unlocked because the queue is new: no concurrency */
4108 queue_flag_set_unlocked(QUEUE_FLAG_CLUSTER, mddev->queue);
4110 blk_queue_make_request(mddev->queue, md_make_request);
4112 disk = alloc_disk(1 << shift);
4114 blk_cleanup_queue(mddev->queue);
4115 mddev->queue = NULL;
4118 disk->major = MAJOR(mddev->unit);
4119 disk->first_minor = unit << shift;
4121 strcpy(disk->disk_name, name);
4122 else if (partitioned)
4123 sprintf(disk->disk_name, "md_d%d", unit);
4125 sprintf(disk->disk_name, "md%d", unit);
4126 disk->fops = &md_fops;
4127 disk->private_data = mddev;
4128 disk->queue = mddev->queue;
4129 /* Allow extended partitions. This makes the
4130 * 'mdp' device redundant, but we can't really
4133 disk->flags |= GENHD_FL_EXT_DEVT;
4135 mddev->gendisk = disk;
4136 error = kobject_init_and_add(&mddev->kobj, &md_ktype,
4137 &disk_to_dev(disk)->kobj, "%s", "md");
4139 /* This isn't possible, but as kobject_init_and_add is marked
4140 * __must_check, we must do something with the result
4142 printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
4146 if (sysfs_create_group(&mddev->kobj, &md_bitmap_group))
4147 printk(KERN_DEBUG "pointless warning\n");
4149 mutex_unlock(&disks_mutex);
4151 kobject_uevent(&mddev->kobj, KOBJ_ADD);
4152 mddev->sysfs_state = sysfs_get_dirent(mddev->kobj.sd, "array_state");
4158 static struct kobject *md_probe(dev_t dev, int *part, void *data)
4160 md_alloc(dev, NULL);
4164 static int add_named_array(const char *val, struct kernel_param *kp)
4166 /* val must be "md_*" where * is not all digits.
4167 * We allocate an array with a large free minor number, and
4168 * set the name to val. val must not already be an active name.
4170 int len = strlen(val);
4171 char buf[DISK_NAME_LEN];
4173 while (len && val[len-1] == '\n')
4175 if (len >= DISK_NAME_LEN)
4177 strlcpy(buf, val, len+1);
4178 if (strncmp(buf, "md_", 3) != 0)
4180 return md_alloc(0, buf);
4183 static void md_safemode_timeout(unsigned long data)
4185 mddev_t *mddev = (mddev_t *) data;
4187 if (!atomic_read(&mddev->writes_pending)) {
4188 mddev->safemode = 1;
4189 if (mddev->external)
4190 sysfs_notify_dirent(mddev->sysfs_state);
4192 md_wakeup_thread(mddev->thread);
4195 static int start_dirty_degraded;
4197 static int do_md_run(mddev_t * mddev)
4201 struct gendisk *disk;
4202 struct mdk_personality *pers;
4204 if (list_empty(&mddev->disks))
4205 /* cannot run an array with no devices.. */
4212 * Analyze all RAID superblock(s)
4214 if (!mddev->raid_disks) {
4215 if (!mddev->persistent)
4220 if (mddev->level != LEVEL_NONE)
4221 request_module("md-level-%d", mddev->level);
4222 else if (mddev->clevel[0])
4223 request_module("md-%s", mddev->clevel);
4226 * Drop all container device buffers, from now on
4227 * the only valid external interface is through the md
4230 list_for_each_entry(rdev, &mddev->disks, same_set) {
4231 if (test_bit(Faulty, &rdev->flags))
4233 sync_blockdev(rdev->bdev);
4234 invalidate_bdev(rdev->bdev);
4236 /* perform some consistency tests on the device.
4237 * We don't want the data to overlap the metadata,
4238 * Internal Bitmap issues have been handled elsewhere.
4240 if (rdev->data_offset < rdev->sb_start) {
4241 if (mddev->dev_sectors &&
4242 rdev->data_offset + mddev->dev_sectors
4244 printk("md: %s: data overlaps metadata\n",
4249 if (rdev->sb_start + rdev->sb_size/512
4250 > rdev->data_offset) {
4251 printk("md: %s: metadata overlaps data\n",
4256 sysfs_notify_dirent(rdev->sysfs_state);
4259 md_probe(mddev->unit, NULL, NULL);
4260 disk = mddev->gendisk;
4264 spin_lock(&pers_lock);
4265 pers = find_pers(mddev->level, mddev->clevel);
4266 if (!pers || !try_module_get(pers->owner)) {
4267 spin_unlock(&pers_lock);
4268 if (mddev->level != LEVEL_NONE)
4269 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
4272 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
4277 spin_unlock(&pers_lock);
4278 if (mddev->level != pers->level) {
4279 mddev->level = pers->level;
4280 mddev->new_level = pers->level;
4282 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
4284 if (mddev->reshape_position != MaxSector &&
4285 pers->start_reshape == NULL) {
4286 /* This personality cannot handle reshaping... */
4288 module_put(pers->owner);
4292 if (pers->sync_request) {
4293 /* Warn if this is a potentially silly
4296 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
4300 list_for_each_entry(rdev, &mddev->disks, same_set)
4301 list_for_each_entry(rdev2, &mddev->disks, same_set) {
4303 rdev->bdev->bd_contains ==
4304 rdev2->bdev->bd_contains) {
4306 "%s: WARNING: %s appears to be"
4307 " on the same physical disk as"
4310 bdevname(rdev->bdev,b),
4311 bdevname(rdev2->bdev,b2));
4318 "True protection against single-disk"
4319 " failure might be compromised.\n");
4322 mddev->recovery = 0;
4323 /* may be over-ridden by personality */
4324 mddev->resync_max_sectors = mddev->dev_sectors;
4326 mddev->barriers_work = 1;
4327 mddev->ok_start_degraded = start_dirty_degraded;
4330 mddev->ro = 2; /* read-only, but switch on first write */
4332 err = mddev->pers->run(mddev);
4334 printk(KERN_ERR "md: pers->run() failed ...\n");
4335 else if (mddev->pers->size(mddev, 0, 0) < mddev->array_sectors) {
4336 WARN_ONCE(!mddev->external_size, "%s: default size too small,"
4337 " but 'external_size' not in effect?\n", __func__);
4339 "md: invalid array_size %llu > default size %llu\n",
4340 (unsigned long long)mddev->array_sectors / 2,
4341 (unsigned long long)mddev->pers->size(mddev, 0, 0) / 2);
4343 mddev->pers->stop(mddev);
4345 if (err == 0 && mddev->pers->sync_request) {
4346 err = bitmap_create(mddev);
4348 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
4349 mdname(mddev), err);
4350 mddev->pers->stop(mddev);
4354 module_put(mddev->pers->owner);
4356 bitmap_destroy(mddev);
4359 if (mddev->pers->sync_request) {
4360 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
4362 "md: cannot register extra attributes for %s\n",
4364 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action");
4365 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
4368 atomic_set(&mddev->writes_pending,0);
4369 atomic_set(&mddev->max_corr_read_errors,
4370 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS);
4371 mddev->safemode = 0;
4372 mddev->safemode_timer.function = md_safemode_timeout;
4373 mddev->safemode_timer.data = (unsigned long) mddev;
4374 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
4377 list_for_each_entry(rdev, &mddev->disks, same_set)
4378 if (rdev->raid_disk >= 0) {
4380 sprintf(nm, "rd%d", rdev->raid_disk);
4381 if (sysfs_create_link(&mddev->kobj, &rdev->kobj, nm))
4382 printk("md: cannot register %s for %s\n",
4386 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4389 md_update_sb(mddev, 0);
4391 set_capacity(disk, mddev->array_sectors);
4393 /* If there is a partially-recovered drive we need to
4394 * start recovery here. If we leave it to md_check_recovery,
4395 * it will remove the drives and not do the right thing
4397 if (mddev->degraded && !mddev->sync_thread) {
4399 list_for_each_entry(rdev, &mddev->disks, same_set)
4400 if (rdev->raid_disk >= 0 &&
4401 !test_bit(In_sync, &rdev->flags) &&
4402 !test_bit(Faulty, &rdev->flags))
4403 /* complete an interrupted recovery */
4405 if (spares && mddev->pers->sync_request) {
4406 mddev->recovery = 0;
4407 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
4408 mddev->sync_thread = md_register_thread(md_do_sync,
4411 if (!mddev->sync_thread) {
4412 printk(KERN_ERR "%s: could not start resync"
4415 /* leave the spares where they are, it shouldn't hurt */
4416 mddev->recovery = 0;
4420 md_wakeup_thread(mddev->thread);
4421 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
4423 revalidate_disk(mddev->gendisk);
4425 md_new_event(mddev);
4426 sysfs_notify_dirent(mddev->sysfs_state);
4427 if (mddev->sysfs_action)
4428 sysfs_notify_dirent(mddev->sysfs_action);
4429 sysfs_notify(&mddev->kobj, NULL, "degraded");
4430 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
4434 static int restart_array(mddev_t *mddev)
4436 struct gendisk *disk = mddev->gendisk;
4438 /* Complain if it has no devices */
4439 if (list_empty(&mddev->disks))
4445 mddev->safemode = 0;
4447 set_disk_ro(disk, 0);
4448 printk(KERN_INFO "md: %s switched to read-write mode.\n",
4450 /* Kick recovery or resync if necessary */
4451 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4452 md_wakeup_thread(mddev->thread);
4453 md_wakeup_thread(mddev->sync_thread);
4454 sysfs_notify_dirent(mddev->sysfs_state);
4458 /* similar to deny_write_access, but accounts for our holding a reference
4459 * to the file ourselves */
4460 static int deny_bitmap_write_access(struct file * file)
4462 struct inode *inode = file->f_mapping->host;
4464 spin_lock(&inode->i_lock);
4465 if (atomic_read(&inode->i_writecount) > 1) {
4466 spin_unlock(&inode->i_lock);
4469 atomic_set(&inode->i_writecount, -1);
4470 spin_unlock(&inode->i_lock);
4475 void restore_bitmap_write_access(struct file *file)
4477 struct inode *inode = file->f_mapping->host;
4479 spin_lock(&inode->i_lock);
4480 atomic_set(&inode->i_writecount, 1);
4481 spin_unlock(&inode->i_lock);
4485 * 0 - completely stop and dis-assemble array
4486 * 1 - switch to readonly
4487 * 2 - stop but do not disassemble array
4489 static int do_md_stop(mddev_t * mddev, int mode, int is_open)
4492 struct gendisk *disk = mddev->gendisk;
4495 mutex_lock(&mddev->open_mutex);
4496 if (atomic_read(&mddev->openers) > is_open) {
4497 printk("md: %s still in use.\n",mdname(mddev));
4499 } else if (mddev->pers) {
4501 if (mddev->sync_thread) {
4502 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4503 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4504 md_unregister_thread(mddev->sync_thread);
4505 mddev->sync_thread = NULL;
4508 del_timer_sync(&mddev->safemode_timer);
4511 case 1: /* readonly */
4517 case 0: /* disassemble */
4519 bitmap_flush(mddev);
4520 md_super_wait(mddev);
4522 set_disk_ro(disk, 0);
4524 mddev->pers->stop(mddev);
4525 mddev->queue->merge_bvec_fn = NULL;
4526 mddev->queue->unplug_fn = NULL;
4527 mddev->queue->backing_dev_info.congested_fn = NULL;
4528 module_put(mddev->pers->owner);
4529 if (mddev->pers->sync_request)
4530 mddev->private = &md_redundancy_group;
4532 /* tell userspace to handle 'inactive' */
4533 sysfs_notify_dirent(mddev->sysfs_state);
4535 list_for_each_entry(rdev, &mddev->disks, same_set)
4536 if (rdev->raid_disk >= 0) {
4538 sprintf(nm, "rd%d", rdev->raid_disk);
4539 sysfs_remove_link(&mddev->kobj, nm);
4542 set_capacity(disk, 0);
4548 if (!mddev->in_sync || mddev->flags) {
4549 /* mark array as shutdown cleanly */
4551 md_update_sb(mddev, 1);
4554 set_disk_ro(disk, 1);
4555 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4559 mutex_unlock(&mddev->open_mutex);
4563 * Free resources if final stop
4567 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
4569 bitmap_destroy(mddev);
4570 if (mddev->bitmap_info.file) {
4571 restore_bitmap_write_access(mddev->bitmap_info.file);
4572 fput(mddev->bitmap_info.file);
4573 mddev->bitmap_info.file = NULL;
4575 mddev->bitmap_info.offset = 0;
4577 /* make sure all md_delayed_delete calls have finished */
4578 flush_scheduled_work();
4580 export_array(mddev);
4582 mddev->array_sectors = 0;
4583 mddev->external_size = 0;
4584 mddev->dev_sectors = 0;
4585 mddev->raid_disks = 0;
4586 mddev->recovery_cp = 0;
4587 mddev->resync_min = 0;
4588 mddev->resync_max = MaxSector;
4589 mddev->reshape_position = MaxSector;
4590 mddev->external = 0;
4591 mddev->persistent = 0;
4592 mddev->level = LEVEL_NONE;
4593 mddev->clevel[0] = 0;
4596 mddev->metadata_type[0] = 0;
4597 mddev->chunk_sectors = 0;
4598 mddev->ctime = mddev->utime = 0;
4600 mddev->max_disks = 0;
4602 mddev->delta_disks = 0;
4603 mddev->new_level = LEVEL_NONE;
4604 mddev->new_layout = 0;
4605 mddev->new_chunk_sectors = 0;
4606 mddev->curr_resync = 0;
4607 mddev->resync_mismatches = 0;
4608 mddev->suspend_lo = mddev->suspend_hi = 0;
4609 mddev->sync_speed_min = mddev->sync_speed_max = 0;
4610 mddev->recovery = 0;
4613 mddev->degraded = 0;
4614 mddev->barriers_work = 0;
4615 mddev->safemode = 0;
4616 mddev->bitmap_info.offset = 0;
4617 mddev->bitmap_info.default_offset = 0;
4618 mddev->bitmap_info.chunksize = 0;
4619 mddev->bitmap_info.daemon_sleep = 0;
4620 mddev->bitmap_info.max_write_behind = 0;
4621 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
4622 if (mddev->hold_active == UNTIL_STOP)
4623 mddev->hold_active = 0;
4625 } else if (mddev->pers)
4626 printk(KERN_INFO "md: %s switched to read-only mode.\n",
4629 blk_integrity_unregister(disk);
4630 md_new_event(mddev);
4631 sysfs_notify_dirent(mddev->sysfs_state);
4636 static void autorun_array(mddev_t *mddev)
4641 if (list_empty(&mddev->disks))
4644 printk(KERN_INFO "md: running: ");
4646 list_for_each_entry(rdev, &mddev->disks, same_set) {
4647 char b[BDEVNAME_SIZE];
4648 printk("<%s>", bdevname(rdev->bdev,b));
4652 err = do_md_run(mddev);
4654 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
4655 do_md_stop(mddev, 0, 0);
4660 * lets try to run arrays based on all disks that have arrived
4661 * until now. (those are in pending_raid_disks)
4663 * the method: pick the first pending disk, collect all disks with
4664 * the same UUID, remove all from the pending list and put them into
4665 * the 'same_array' list. Then order this list based on superblock
4666 * update time (freshest comes first), kick out 'old' disks and
4667 * compare superblocks. If everything's fine then run it.
4669 * If "unit" is allocated, then bump its reference count
4671 static void autorun_devices(int part)
4673 mdk_rdev_t *rdev0, *rdev, *tmp;
4675 char b[BDEVNAME_SIZE];
4677 printk(KERN_INFO "md: autorun ...\n");
4678 while (!list_empty(&pending_raid_disks)) {
4681 LIST_HEAD(candidates);
4682 rdev0 = list_entry(pending_raid_disks.next,
4683 mdk_rdev_t, same_set);
4685 printk(KERN_INFO "md: considering %s ...\n",
4686 bdevname(rdev0->bdev,b));
4687 INIT_LIST_HEAD(&candidates);
4688 rdev_for_each_list(rdev, tmp, &pending_raid_disks)
4689 if (super_90_load(rdev, rdev0, 0) >= 0) {
4690 printk(KERN_INFO "md: adding %s ...\n",
4691 bdevname(rdev->bdev,b));
4692 list_move(&rdev->same_set, &candidates);
4695 * now we have a set of devices, with all of them having
4696 * mostly sane superblocks. It's time to allocate the
4700 dev = MKDEV(mdp_major,
4701 rdev0->preferred_minor << MdpMinorShift);
4702 unit = MINOR(dev) >> MdpMinorShift;
4704 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
4707 if (rdev0->preferred_minor != unit) {
4708 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
4709 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
4713 md_probe(dev, NULL, NULL);
4714 mddev = mddev_find(dev);
4715 if (!mddev || !mddev->gendisk) {
4719 "md: cannot allocate memory for md drive.\n");
4722 if (mddev_lock(mddev))
4723 printk(KERN_WARNING "md: %s locked, cannot run\n",
4725 else if (mddev->raid_disks || mddev->major_version
4726 || !list_empty(&mddev->disks)) {
4728 "md: %s already running, cannot run %s\n",
4729 mdname(mddev), bdevname(rdev0->bdev,b));
4730 mddev_unlock(mddev);
4732 printk(KERN_INFO "md: created %s\n", mdname(mddev));
4733 mddev->persistent = 1;
4734 rdev_for_each_list(rdev, tmp, &candidates) {
4735 list_del_init(&rdev->same_set);
4736 if (bind_rdev_to_array(rdev, mddev))
4739 autorun_array(mddev);
4740 mddev_unlock(mddev);
4742 /* on success, candidates will be empty, on error
4745 rdev_for_each_list(rdev, tmp, &candidates) {
4746 list_del_init(&rdev->same_set);
4751 printk(KERN_INFO "md: ... autorun DONE.\n");
4753 #endif /* !MODULE */
4755 static int get_version(void __user * arg)
4759 ver.major = MD_MAJOR_VERSION;
4760 ver.minor = MD_MINOR_VERSION;
4761 ver.patchlevel = MD_PATCHLEVEL_VERSION;
4763 if (copy_to_user(arg, &ver, sizeof(ver)))
4769 static int get_array_info(mddev_t * mddev, void __user * arg)
4771 mdu_array_info_t info;
4772 int nr,working,insync,failed,spare;
4775 nr=working=insync=failed=spare=0;
4776 list_for_each_entry(rdev, &mddev->disks, same_set) {
4778 if (test_bit(Faulty, &rdev->flags))
4782 if (test_bit(In_sync, &rdev->flags))
4789 info.major_version = mddev->major_version;
4790 info.minor_version = mddev->minor_version;
4791 info.patch_version = MD_PATCHLEVEL_VERSION;
4792 info.ctime = mddev->ctime;
4793 info.level = mddev->level;
4794 info.size = mddev->dev_sectors / 2;
4795 if (info.size != mddev->dev_sectors / 2) /* overflow */
4798 info.raid_disks = mddev->raid_disks;
4799 info.md_minor = mddev->md_minor;
4800 info.not_persistent= !mddev->persistent;
4802 info.utime = mddev->utime;
4805 info.state = (1<<MD_SB_CLEAN);
4806 if (mddev->bitmap && mddev->bitmap_info.offset)
4807 info.state = (1<<MD_SB_BITMAP_PRESENT);
4808 info.active_disks = insync;
4809 info.working_disks = working;
4810 info.failed_disks = failed;
4811 info.spare_disks = spare;
4813 info.layout = mddev->layout;
4814 info.chunk_size = mddev->chunk_sectors << 9;
4816 if (copy_to_user(arg, &info, sizeof(info)))
4822 static int get_bitmap_file(mddev_t * mddev, void __user * arg)
4824 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
4825 char *ptr, *buf = NULL;
4828 if (md_allow_write(mddev))
4829 file = kmalloc(sizeof(*file), GFP_NOIO);
4831 file = kmalloc(sizeof(*file), GFP_KERNEL);
4836 /* bitmap disabled, zero the first byte and copy out */
4837 if (!mddev->bitmap || !mddev->bitmap->file) {
4838 file->pathname[0] = '\0';
4842 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
4846 ptr = d_path(&mddev->bitmap->file->f_path, buf, sizeof(file->pathname));
4850 strcpy(file->pathname, ptr);
4854 if (copy_to_user(arg, file, sizeof(*file)))
4862 static int get_disk_info(mddev_t * mddev, void __user * arg)
4864 mdu_disk_info_t info;
4867 if (copy_from_user(&info, arg, sizeof(info)))
4870 rdev = find_rdev_nr(mddev, info.number);
4872 info.major = MAJOR(rdev->bdev->bd_dev);
4873 info.minor = MINOR(rdev->bdev->bd_dev);
4874 info.raid_disk = rdev->raid_disk;
4876 if (test_bit(Faulty, &rdev->flags))
4877 info.state |= (1<<MD_DISK_FAULTY);
4878 else if (test_bit(In_sync, &rdev->flags)) {
4879 info.state |= (1<<MD_DISK_ACTIVE);
4880 info.state |= (1<<MD_DISK_SYNC);
4882 if (test_bit(WriteMostly, &rdev->flags))
4883 info.state |= (1<<MD_DISK_WRITEMOSTLY);
4885 info.major = info.minor = 0;
4886 info.raid_disk = -1;
4887 info.state = (1<<MD_DISK_REMOVED);
4890 if (copy_to_user(arg, &info, sizeof(info)))
4896 static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
4898 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
4900 dev_t dev = MKDEV(info->major,info->minor);
4902 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
4905 if (!mddev->raid_disks) {
4907 /* expecting a device which has a superblock */
4908 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
4911 "md: md_import_device returned %ld\n",
4913 return PTR_ERR(rdev);
4915 if (!list_empty(&mddev->disks)) {
4916 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
4917 mdk_rdev_t, same_set);
4918 err = super_types[mddev->major_version]
4919 .load_super(rdev, rdev0, mddev->minor_version);
4922 "md: %s has different UUID to %s\n",
4923 bdevname(rdev->bdev,b),
4924 bdevname(rdev0->bdev,b2));
4929 err = bind_rdev_to_array(rdev, mddev);
4936 * add_new_disk can be used once the array is assembled
4937 * to add "hot spares". They must already have a superblock
4942 if (!mddev->pers->hot_add_disk) {
4944 "%s: personality does not support diskops!\n",
4948 if (mddev->persistent)
4949 rdev = md_import_device(dev, mddev->major_version,
4950 mddev->minor_version);
4952 rdev = md_import_device(dev, -1, -1);
4955 "md: md_import_device returned %ld\n",
4957 return PTR_ERR(rdev);
4959 /* set save_raid_disk if appropriate */
4960 if (!mddev->persistent) {
4961 if (info->state & (1<<MD_DISK_SYNC) &&
4962 info->raid_disk < mddev->raid_disks)
4963 rdev->raid_disk = info->raid_disk;
4965 rdev->raid_disk = -1;
4967 super_types[mddev->major_version].
4968 validate_super(mddev, rdev);
4969 rdev->saved_raid_disk = rdev->raid_disk;
4971 clear_bit(In_sync, &rdev->flags); /* just to be sure */
4972 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
4973 set_bit(WriteMostly, &rdev->flags);
4975 clear_bit(WriteMostly, &rdev->flags);
4977 rdev->raid_disk = -1;
4978 err = bind_rdev_to_array(rdev, mddev);
4979 if (!err && !mddev->pers->hot_remove_disk) {
4980 /* If there is hot_add_disk but no hot_remove_disk
4981 * then added disks for geometry changes,
4982 * and should be added immediately.
4984 super_types[mddev->major_version].
4985 validate_super(mddev, rdev);
4986 err = mddev->pers->hot_add_disk(mddev, rdev);
4988 unbind_rdev_from_array(rdev);
4993 sysfs_notify_dirent(rdev->sysfs_state);
4995 md_update_sb(mddev, 1);
4996 if (mddev->degraded)
4997 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
4998 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4999 md_wakeup_thread(mddev->thread);
5003 /* otherwise, add_new_disk is only allowed
5004 * for major_version==0 superblocks
5006 if (mddev->major_version != 0) {
5007 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
5012 if (!(info->state & (1<<MD_DISK_FAULTY))) {
5014 rdev = md_import_device(dev, -1, 0);
5017 "md: error, md_import_device() returned %ld\n",
5019 return PTR_ERR(rdev);
5021 rdev->desc_nr = info->number;
5022 if (info->raid_disk < mddev->raid_disks)
5023 rdev->raid_disk = info->raid_disk;
5025 rdev->raid_disk = -1;
5027 if (rdev->raid_disk < mddev->raid_disks)
5028 if (info->state & (1<<MD_DISK_SYNC))
5029 set_bit(In_sync, &rdev->flags);
5031 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
5032 set_bit(WriteMostly, &rdev->flags);
5034 if (!mddev->persistent) {
5035 printk(KERN_INFO "md: nonpersistent superblock ...\n");
5036 rdev->sb_start = rdev->bdev->bd_inode->i_size / 512;
5038 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
5039 rdev->sectors = rdev->sb_start;
5041 err = bind_rdev_to_array(rdev, mddev);
5051 static int hot_remove_disk(mddev_t * mddev, dev_t dev)
5053 char b[BDEVNAME_SIZE];
5056 rdev = find_rdev(mddev, dev);
5060 if (rdev->raid_disk >= 0)
5063 kick_rdev_from_array(rdev);
5064 md_update_sb(mddev, 1);
5065 md_new_event(mddev);
5069 printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n",
5070 bdevname(rdev->bdev,b), mdname(mddev));
5074 static int hot_add_disk(mddev_t * mddev, dev_t dev)
5076 char b[BDEVNAME_SIZE];
5083 if (mddev->major_version != 0) {
5084 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
5085 " version-0 superblocks.\n",
5089 if (!mddev->pers->hot_add_disk) {
5091 "%s: personality does not support diskops!\n",
5096 rdev = md_import_device(dev, -1, 0);
5099 "md: error, md_import_device() returned %ld\n",
5104 if (mddev->persistent)
5105 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
5107 rdev->sb_start = rdev->bdev->bd_inode->i_size / 512;
5109 rdev->sectors = rdev->sb_start;
5111 if (test_bit(Faulty, &rdev->flags)) {
5113 "md: can not hot-add faulty %s disk to %s!\n",
5114 bdevname(rdev->bdev,b), mdname(mddev));
5118 clear_bit(In_sync, &rdev->flags);
5120 rdev->saved_raid_disk = -1;
5121 err = bind_rdev_to_array(rdev, mddev);
5126 * The rest should better be atomic, we can have disk failures
5127 * noticed in interrupt contexts ...
5130 rdev->raid_disk = -1;
5132 md_update_sb(mddev, 1);
5135 * Kick recovery, maybe this spare has to be added to the
5136 * array immediately.
5138 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5139 md_wakeup_thread(mddev->thread);
5140 md_new_event(mddev);
5148 static int set_bitmap_file(mddev_t *mddev, int fd)
5153 if (!mddev->pers->quiesce)
5155 if (mddev->recovery || mddev->sync_thread)
5157 /* we should be able to change the bitmap.. */
5163 return -EEXIST; /* cannot add when bitmap is present */
5164 mddev->bitmap_info.file = fget(fd);
5166 if (mddev->bitmap_info.file == NULL) {
5167 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
5172 err = deny_bitmap_write_access(mddev->bitmap_info.file);
5174 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
5176 fput(mddev->bitmap_info.file);
5177 mddev->bitmap_info.file = NULL;
5180 mddev->bitmap_info.offset = 0; /* file overrides offset */
5181 } else if (mddev->bitmap == NULL)
5182 return -ENOENT; /* cannot remove what isn't there */
5185 mddev->pers->quiesce(mddev, 1);
5187 err = bitmap_create(mddev);
5188 if (fd < 0 || err) {
5189 bitmap_destroy(mddev);
5190 fd = -1; /* make sure to put the file */
5192 mddev->pers->quiesce(mddev, 0);
5195 if (mddev->bitmap_info.file) {
5196 restore_bitmap_write_access(mddev->bitmap_info.file);
5197 fput(mddev->bitmap_info.file);
5199 mddev->bitmap_info.file = NULL;
5206 * set_array_info is used two different ways
5207 * The original usage is when creating a new array.
5208 * In this usage, raid_disks is > 0 and it together with
5209 * level, size, not_persistent,layout,chunksize determine the
5210 * shape of the array.
5211 * This will always create an array with a type-0.90.0 superblock.
5212 * The newer usage is when assembling an array.
5213 * In this case raid_disks will be 0, and the major_version field is
5214 * use to determine which style super-blocks are to be found on the devices.
5215 * The minor and patch _version numbers are also kept incase the
5216 * super_block handler wishes to interpret them.
5218 static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
5221 if (info->raid_disks == 0) {
5222 /* just setting version number for superblock loading */
5223 if (info->major_version < 0 ||
5224 info->major_version >= ARRAY_SIZE(super_types) ||
5225 super_types[info->major_version].name == NULL) {
5226 /* maybe try to auto-load a module? */
5228 "md: superblock version %d not known\n",
5229 info->major_version);
5232 mddev->major_version = info->major_version;
5233 mddev->minor_version = info->minor_version;
5234 mddev->patch_version = info->patch_version;
5235 mddev->persistent = !info->not_persistent;
5238 mddev->major_version = MD_MAJOR_VERSION;
5239 mddev->minor_version = MD_MINOR_VERSION;
5240 mddev->patch_version = MD_PATCHLEVEL_VERSION;
5241 mddev->ctime = get_seconds();
5243 mddev->level = info->level;
5244 mddev->clevel[0] = 0;
5245 mddev->dev_sectors = 2 * (sector_t)info->size;
5246 mddev->raid_disks = info->raid_disks;
5247 /* don't set md_minor, it is determined by which /dev/md* was
5250 if (info->state & (1<<MD_SB_CLEAN))
5251 mddev->recovery_cp = MaxSector;
5253 mddev->recovery_cp = 0;
5254 mddev->persistent = ! info->not_persistent;
5255 mddev->external = 0;
5257 mddev->layout = info->layout;
5258 mddev->chunk_sectors = info->chunk_size >> 9;
5260 mddev->max_disks = MD_SB_DISKS;
5262 if (mddev->persistent)
5264 set_bit(MD_CHANGE_DEVS, &mddev->flags);
5266 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
5267 mddev->bitmap_info.offset = 0;
5269 mddev->reshape_position = MaxSector;
5272 * Generate a 128 bit UUID
5274 get_random_bytes(mddev->uuid, 16);
5276 mddev->new_level = mddev->level;
5277 mddev->new_chunk_sectors = mddev->chunk_sectors;
5278 mddev->new_layout = mddev->layout;
5279 mddev->delta_disks = 0;
5284 void md_set_array_sectors(mddev_t *mddev, sector_t array_sectors)
5286 WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__);
5288 if (mddev->external_size)
5291 mddev->array_sectors = array_sectors;
5293 EXPORT_SYMBOL(md_set_array_sectors);
5295 static int update_size(mddev_t *mddev, sector_t num_sectors)
5299 int fit = (num_sectors == 0);
5301 if (mddev->pers->resize == NULL)
5303 /* The "num_sectors" is the number of sectors of each device that
5304 * is used. This can only make sense for arrays with redundancy.
5305 * linear and raid0 always use whatever space is available. We can only
5306 * consider changing this number if no resync or reconstruction is
5307 * happening, and if the new size is acceptable. It must fit before the
5308 * sb_start or, if that is <data_offset, it must fit before the size
5309 * of each device. If num_sectors is zero, we find the largest size
5313 if (mddev->sync_thread)
5316 /* Sorry, cannot grow a bitmap yet, just remove it,
5320 list_for_each_entry(rdev, &mddev->disks, same_set) {
5321 sector_t avail = rdev->sectors;
5323 if (fit && (num_sectors == 0 || num_sectors > avail))
5324 num_sectors = avail;
5325 if (avail < num_sectors)
5328 rv = mddev->pers->resize(mddev, num_sectors);
5330 revalidate_disk(mddev->gendisk);
5334 static int update_raid_disks(mddev_t *mddev, int raid_disks)
5337 /* change the number of raid disks */
5338 if (mddev->pers->check_reshape == NULL)
5340 if (raid_disks <= 0 ||
5341 raid_disks >= mddev->max_disks)
5343 if (mddev->sync_thread || mddev->reshape_position != MaxSector)
5345 mddev->delta_disks = raid_disks - mddev->raid_disks;
5347 rv = mddev->pers->check_reshape(mddev);
5353 * update_array_info is used to change the configuration of an
5355 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
5356 * fields in the info are checked against the array.
5357 * Any differences that cannot be handled will cause an error.
5358 * Normally, only one change can be managed at a time.
5360 static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
5366 /* calculate expected state,ignoring low bits */
5367 if (mddev->bitmap && mddev->bitmap_info.offset)
5368 state |= (1 << MD_SB_BITMAP_PRESENT);
5370 if (mddev->major_version != info->major_version ||
5371 mddev->minor_version != info->minor_version ||
5372 /* mddev->patch_version != info->patch_version || */
5373 mddev->ctime != info->ctime ||
5374 mddev->level != info->level ||
5375 /* mddev->layout != info->layout || */
5376 !mddev->persistent != info->not_persistent||
5377 mddev->chunk_sectors != info->chunk_size >> 9 ||
5378 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
5379 ((state^info->state) & 0xfffffe00)
5382 /* Check there is only one change */
5383 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
5385 if (mddev->raid_disks != info->raid_disks)
5387 if (mddev->layout != info->layout)
5389 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT))
5396 if (mddev->layout != info->layout) {
5398 * we don't need to do anything at the md level, the
5399 * personality will take care of it all.
5401 if (mddev->pers->check_reshape == NULL)
5404 mddev->new_layout = info->layout;
5405 rv = mddev->pers->check_reshape(mddev);
5407 mddev->new_layout = mddev->layout;
5411 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
5412 rv = update_size(mddev, (sector_t)info->size * 2);
5414 if (mddev->raid_disks != info->raid_disks)
5415 rv = update_raid_disks(mddev, info->raid_disks);
5417 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
5418 if (mddev->pers->quiesce == NULL)
5420 if (mddev->recovery || mddev->sync_thread)
5422 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
5423 /* add the bitmap */
5426 if (mddev->bitmap_info.default_offset == 0)
5428 mddev->bitmap_info.offset =
5429 mddev->bitmap_info.default_offset;
5430 mddev->pers->quiesce(mddev, 1);
5431 rv = bitmap_create(mddev);
5433 bitmap_destroy(mddev);
5434 mddev->pers->quiesce(mddev, 0);
5436 /* remove the bitmap */
5439 if (mddev->bitmap->file)
5441 mddev->pers->quiesce(mddev, 1);
5442 bitmap_destroy(mddev);
5443 mddev->pers->quiesce(mddev, 0);
5444 mddev->bitmap_info.offset = 0;
5447 md_update_sb(mddev, 1);
5451 static int set_disk_faulty(mddev_t *mddev, dev_t dev)
5455 if (mddev->pers == NULL)
5458 rdev = find_rdev(mddev, dev);
5462 md_error(mddev, rdev);
5467 * We have a problem here : there is no easy way to give a CHS
5468 * virtual geometry. We currently pretend that we have a 2 heads
5469 * 4 sectors (with a BIG number of cylinders...). This drives
5470 * dosfs just mad... ;-)
5472 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
5474 mddev_t *mddev = bdev->bd_disk->private_data;
5478 geo->cylinders = get_capacity(mddev->gendisk) / 8;
5482 static int md_ioctl(struct block_device *bdev, fmode_t mode,
5483 unsigned int cmd, unsigned long arg)
5486 void __user *argp = (void __user *)arg;
5487 mddev_t *mddev = NULL;
5489 if (!capable(CAP_SYS_ADMIN))
5493 * Commands dealing with the RAID driver but not any
5499 err = get_version(argp);
5502 case PRINT_RAID_DEBUG:
5510 autostart_arrays(arg);
5517 * Commands creating/starting a new array:
5520 mddev = bdev->bd_disk->private_data;
5527 err = mddev_lock(mddev);
5530 "md: ioctl lock interrupted, reason %d, cmd %d\n",
5537 case SET_ARRAY_INFO:
5539 mdu_array_info_t info;
5541 memset(&info, 0, sizeof(info));
5542 else if (copy_from_user(&info, argp, sizeof(info))) {
5547 err = update_array_info(mddev, &info);
5549 printk(KERN_WARNING "md: couldn't update"
5550 " array info. %d\n", err);
5555 if (!list_empty(&mddev->disks)) {
5557 "md: array %s already has disks!\n",
5562 if (mddev->raid_disks) {
5564 "md: array %s already initialised!\n",
5569 err = set_array_info(mddev, &info);
5571 printk(KERN_WARNING "md: couldn't set"
5572 " array info. %d\n", err);
5582 * Commands querying/configuring an existing array:
5584 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
5585 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
5586 if ((!mddev->raid_disks && !mddev->external)
5587 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
5588 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
5589 && cmd != GET_BITMAP_FILE) {
5595 * Commands even a read-only array can execute:
5599 case GET_ARRAY_INFO:
5600 err = get_array_info(mddev, argp);
5603 case GET_BITMAP_FILE:
5604 err = get_bitmap_file(mddev, argp);
5608 err = get_disk_info(mddev, argp);
5611 case RESTART_ARRAY_RW:
5612 err = restart_array(mddev);
5616 err = do_md_stop(mddev, 0, 1);
5620 err = do_md_stop(mddev, 1, 1);
5626 * The remaining ioctls are changing the state of the
5627 * superblock, so we do not allow them on read-only arrays.
5628 * However non-MD ioctls (e.g. get-size) will still come through
5629 * here and hit the 'default' below, so only disallow
5630 * 'md' ioctls, and switch to rw mode if started auto-readonly.
5632 if (_IOC_TYPE(cmd) == MD_MAJOR && mddev->ro && mddev->pers) {
5633 if (mddev->ro == 2) {
5635 sysfs_notify_dirent(mddev->sysfs_state);
5636 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5637 md_wakeup_thread(mddev->thread);
5648 mdu_disk_info_t info;
5649 if (copy_from_user(&info, argp, sizeof(info)))
5652 err = add_new_disk(mddev, &info);
5656 case HOT_REMOVE_DISK:
5657 err = hot_remove_disk(mddev, new_decode_dev(arg));
5661 err = hot_add_disk(mddev, new_decode_dev(arg));
5664 case SET_DISK_FAULTY:
5665 err = set_disk_faulty(mddev, new_decode_dev(arg));
5669 err = do_md_run(mddev);
5672 case SET_BITMAP_FILE:
5673 err = set_bitmap_file(mddev, (int)arg);
5683 if (mddev->hold_active == UNTIL_IOCTL &&
5685 mddev->hold_active = 0;
5686 mddev_unlock(mddev);
5695 #ifdef CONFIG_COMPAT
5696 static int md_compat_ioctl(struct block_device *bdev, fmode_t mode,
5697 unsigned int cmd, unsigned long arg)
5700 case HOT_REMOVE_DISK:
5702 case SET_DISK_FAULTY:
5703 case SET_BITMAP_FILE:
5704 /* These take in integer arg, do not convert */
5707 arg = (unsigned long)compat_ptr(arg);
5711 return md_ioctl(bdev, mode, cmd, arg);
5713 #endif /* CONFIG_COMPAT */
5715 static int md_open(struct block_device *bdev, fmode_t mode)
5718 * Succeed if we can lock the mddev, which confirms that
5719 * it isn't being stopped right now.
5721 mddev_t *mddev = mddev_find(bdev->bd_dev);
5724 if (mddev->gendisk != bdev->bd_disk) {
5725 /* we are racing with mddev_put which is discarding this
5729 /* Wait until bdev->bd_disk is definitely gone */
5730 flush_scheduled_work();
5731 /* Then retry the open from the top */
5732 return -ERESTARTSYS;
5734 BUG_ON(mddev != bdev->bd_disk->private_data);
5736 if ((err = mutex_lock_interruptible(&mddev->open_mutex)))
5740 atomic_inc(&mddev->openers);
5741 mutex_unlock(&mddev->open_mutex);
5743 check_disk_change(bdev);
5748 static int md_release(struct gendisk *disk, fmode_t mode)
5750 mddev_t *mddev = disk->private_data;
5753 atomic_dec(&mddev->openers);
5759 static int md_media_changed(struct gendisk *disk)
5761 mddev_t *mddev = disk->private_data;
5763 return mddev->changed;
5766 static int md_revalidate(struct gendisk *disk)
5768 mddev_t *mddev = disk->private_data;
5773 static const struct block_device_operations md_fops =
5775 .owner = THIS_MODULE,
5777 .release = md_release,
5779 #ifdef CONFIG_COMPAT
5780 .compat_ioctl = md_compat_ioctl,
5782 .getgeo = md_getgeo,
5783 .media_changed = md_media_changed,
5784 .revalidate_disk= md_revalidate,
5787 static int md_thread(void * arg)
5789 mdk_thread_t *thread = arg;
5792 * md_thread is a 'system-thread', it's priority should be very
5793 * high. We avoid resource deadlocks individually in each
5794 * raid personality. (RAID5 does preallocation) We also use RR and
5795 * the very same RT priority as kswapd, thus we will never get
5796 * into a priority inversion deadlock.
5798 * we definitely have to have equal or higher priority than
5799 * bdflush, otherwise bdflush will deadlock if there are too
5800 * many dirty RAID5 blocks.
5803 allow_signal(SIGKILL);
5804 while (!kthread_should_stop()) {
5806 /* We need to wait INTERRUPTIBLE so that
5807 * we don't add to the load-average.
5808 * That means we need to be sure no signals are
5811 if (signal_pending(current))
5812 flush_signals(current);
5814 wait_event_interruptible_timeout
5816 test_bit(THREAD_WAKEUP, &thread->flags)
5817 || kthread_should_stop(),
5820 clear_bit(THREAD_WAKEUP, &thread->flags);
5822 thread->run(thread->mddev);
5828 void md_wakeup_thread(mdk_thread_t *thread)
5831 dprintk("md: waking up MD thread %s.\n", thread->tsk->comm);
5832 set_bit(THREAD_WAKEUP, &thread->flags);
5833 wake_up(&thread->wqueue);
5837 mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
5840 mdk_thread_t *thread;
5842 thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL);
5846 init_waitqueue_head(&thread->wqueue);
5849 thread->mddev = mddev;
5850 thread->timeout = MAX_SCHEDULE_TIMEOUT;
5851 thread->tsk = kthread_run(md_thread, thread,
5853 mdname(thread->mddev),
5854 name ?: mddev->pers->name);
5855 if (IS_ERR(thread->tsk)) {
5862 void md_unregister_thread(mdk_thread_t *thread)
5866 dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
5868 kthread_stop(thread->tsk);
5872 void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
5879 if (!rdev || test_bit(Faulty, &rdev->flags))
5882 if (mddev->external)
5883 set_bit(Blocked, &rdev->flags);
5885 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
5887 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
5888 __builtin_return_address(0),__builtin_return_address(1),
5889 __builtin_return_address(2),__builtin_return_address(3));
5893 if (!mddev->pers->error_handler)
5895 mddev->pers->error_handler(mddev,rdev);
5896 if (mddev->degraded)
5897 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
5898 set_bit(StateChanged, &rdev->flags);
5899 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5900 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5901 md_wakeup_thread(mddev->thread);
5902 md_new_event_inintr(mddev);
5905 /* seq_file implementation /proc/mdstat */
5907 static void status_unused(struct seq_file *seq)
5912 seq_printf(seq, "unused devices: ");
5914 list_for_each_entry(rdev, &pending_raid_disks, same_set) {
5915 char b[BDEVNAME_SIZE];
5917 seq_printf(seq, "%s ",
5918 bdevname(rdev->bdev,b));
5921 seq_printf(seq, "<none>");
5923 seq_printf(seq, "\n");
5927 static void status_resync(struct seq_file *seq, mddev_t * mddev)
5929 sector_t max_sectors, resync, res;
5930 unsigned long dt, db;
5933 unsigned int per_milli;
5935 resync = mddev->curr_resync - atomic_read(&mddev->recovery_active);
5937 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
5938 max_sectors = mddev->resync_max_sectors;
5940 max_sectors = mddev->dev_sectors;
5943 * Should not happen.
5949 /* Pick 'scale' such that (resync>>scale)*1000 will fit
5950 * in a sector_t, and (max_sectors>>scale) will fit in a
5951 * u32, as those are the requirements for sector_div.
5952 * Thus 'scale' must be at least 10
5955 if (sizeof(sector_t) > sizeof(unsigned long)) {
5956 while ( max_sectors/2 > (1ULL<<(scale+32)))
5959 res = (resync>>scale)*1000;
5960 sector_div(res, (u32)((max_sectors>>scale)+1));
5964 int i, x = per_milli/50, y = 20-x;
5965 seq_printf(seq, "[");
5966 for (i = 0; i < x; i++)
5967 seq_printf(seq, "=");
5968 seq_printf(seq, ">");
5969 for (i = 0; i < y; i++)
5970 seq_printf(seq, ".");
5971 seq_printf(seq, "] ");
5973 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
5974 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
5976 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
5978 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
5979 "resync" : "recovery"))),
5980 per_milli/10, per_milli % 10,
5981 (unsigned long long) resync/2,
5982 (unsigned long long) max_sectors/2);
5985 * dt: time from mark until now
5986 * db: blocks written from mark until now
5987 * rt: remaining time
5989 * rt is a sector_t, so could be 32bit or 64bit.
5990 * So we divide before multiply in case it is 32bit and close
5992 * We scale the divisor (db) by 32 to avoid loosing precision
5993 * near the end of resync when the number of remaining sectors
5995 * We then divide rt by 32 after multiplying by db to compensate.
5996 * The '+1' avoids division by zero if db is very small.
5998 dt = ((jiffies - mddev->resync_mark) / HZ);
6000 db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active))
6001 - mddev->resync_mark_cnt;
6003 rt = max_sectors - resync; /* number of remaining sectors */
6004 sector_div(rt, db/32+1);
6008 seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60,
6009 ((unsigned long)rt % 60)/6);
6011 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
6014 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
6016 struct list_head *tmp;
6026 spin_lock(&all_mddevs_lock);
6027 list_for_each(tmp,&all_mddevs)
6029 mddev = list_entry(tmp, mddev_t, all_mddevs);
6031 spin_unlock(&all_mddevs_lock);
6034 spin_unlock(&all_mddevs_lock);
6036 return (void*)2;/* tail */
6040 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
6042 struct list_head *tmp;
6043 mddev_t *next_mddev, *mddev = v;
6049 spin_lock(&all_mddevs_lock);
6051 tmp = all_mddevs.next;
6053 tmp = mddev->all_mddevs.next;
6054 if (tmp != &all_mddevs)
6055 next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs));
6057 next_mddev = (void*)2;
6060 spin_unlock(&all_mddevs_lock);
6068 static void md_seq_stop(struct seq_file *seq, void *v)
6072 if (mddev && v != (void*)1 && v != (void*)2)
6076 struct mdstat_info {
6080 static int md_seq_show(struct seq_file *seq, void *v)
6085 struct mdstat_info *mi = seq->private;
6086 struct bitmap *bitmap;
6088 if (v == (void*)1) {
6089 struct mdk_personality *pers;
6090 seq_printf(seq, "Personalities : ");
6091 spin_lock(&pers_lock);
6092 list_for_each_entry(pers, &pers_list, list)
6093 seq_printf(seq, "[%s] ", pers->name);
6095 spin_unlock(&pers_lock);
6096 seq_printf(seq, "\n");
6097 mi->event = atomic_read(&md_event_count);
6100 if (v == (void*)2) {
6105 if (mddev_lock(mddev) < 0)
6108 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
6109 seq_printf(seq, "%s : %sactive", mdname(mddev),
6110 mddev->pers ? "" : "in");
6113 seq_printf(seq, " (read-only)");
6115 seq_printf(seq, " (auto-read-only)");
6116 seq_printf(seq, " %s", mddev->pers->name);
6120 list_for_each_entry(rdev, &mddev->disks, same_set) {
6121 char b[BDEVNAME_SIZE];
6122 seq_printf(seq, " %s[%d]",
6123 bdevname(rdev->bdev,b), rdev->desc_nr);
6124 if (test_bit(WriteMostly, &rdev->flags))
6125 seq_printf(seq, "(W)");
6126 if (test_bit(Faulty, &rdev->flags)) {
6127 seq_printf(seq, "(F)");
6129 } else if (rdev->raid_disk < 0)
6130 seq_printf(seq, "(S)"); /* spare */
6131 sectors += rdev->sectors;
6134 if (!list_empty(&mddev->disks)) {
6136 seq_printf(seq, "\n %llu blocks",
6137 (unsigned long long)
6138 mddev->array_sectors / 2);
6140 seq_printf(seq, "\n %llu blocks",
6141 (unsigned long long)sectors / 2);
6143 if (mddev->persistent) {
6144 if (mddev->major_version != 0 ||
6145 mddev->minor_version != 90) {
6146 seq_printf(seq," super %d.%d",
6147 mddev->major_version,
6148 mddev->minor_version);
6150 } else if (mddev->external)
6151 seq_printf(seq, " super external:%s",
6152 mddev->metadata_type);
6154 seq_printf(seq, " super non-persistent");
6157 mddev->pers->status(seq, mddev);
6158 seq_printf(seq, "\n ");
6159 if (mddev->pers->sync_request) {
6160 if (mddev->curr_resync > 2) {
6161 status_resync(seq, mddev);
6162 seq_printf(seq, "\n ");
6163 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
6164 seq_printf(seq, "\tresync=DELAYED\n ");
6165 else if (mddev->recovery_cp < MaxSector)
6166 seq_printf(seq, "\tresync=PENDING\n ");
6169 seq_printf(seq, "\n ");
6171 if ((bitmap = mddev->bitmap)) {
6172 unsigned long chunk_kb;
6173 unsigned long flags;
6174 spin_lock_irqsave(&bitmap->lock, flags);
6175 chunk_kb = mddev->bitmap_info.chunksize >> 10;
6176 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
6178 bitmap->pages - bitmap->missing_pages,
6180 (bitmap->pages - bitmap->missing_pages)
6181 << (PAGE_SHIFT - 10),
6182 chunk_kb ? chunk_kb : mddev->bitmap_info.chunksize,
6183 chunk_kb ? "KB" : "B");
6185 seq_printf(seq, ", file: ");
6186 seq_path(seq, &bitmap->file->f_path, " \t\n");
6189 seq_printf(seq, "\n");
6190 spin_unlock_irqrestore(&bitmap->lock, flags);
6193 seq_printf(seq, "\n");
6195 mddev_unlock(mddev);
6200 static const struct seq_operations md_seq_ops = {
6201 .start = md_seq_start,
6202 .next = md_seq_next,
6203 .stop = md_seq_stop,
6204 .show = md_seq_show,
6207 static int md_seq_open(struct inode *inode, struct file *file)
6210 struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL);
6214 error = seq_open(file, &md_seq_ops);
6218 struct seq_file *p = file->private_data;
6220 mi->event = atomic_read(&md_event_count);
6225 static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
6227 struct seq_file *m = filp->private_data;
6228 struct mdstat_info *mi = m->private;
6231 poll_wait(filp, &md_event_waiters, wait);
6233 /* always allow read */
6234 mask = POLLIN | POLLRDNORM;
6236 if (mi->event != atomic_read(&md_event_count))
6237 mask |= POLLERR | POLLPRI;
6241 static const struct file_operations md_seq_fops = {
6242 .owner = THIS_MODULE,
6243 .open = md_seq_open,
6245 .llseek = seq_lseek,
6246 .release = seq_release_private,
6247 .poll = mdstat_poll,
6250 int register_md_personality(struct mdk_personality *p)
6252 spin_lock(&pers_lock);
6253 list_add_tail(&p->list, &pers_list);
6254 printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level);
6255 spin_unlock(&pers_lock);
6259 int unregister_md_personality(struct mdk_personality *p)
6261 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
6262 spin_lock(&pers_lock);
6263 list_del_init(&p->list);
6264 spin_unlock(&pers_lock);
6268 static int is_mddev_idle(mddev_t *mddev, int init)
6276 rdev_for_each_rcu(rdev, mddev) {
6277 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
6278 curr_events = (int)part_stat_read(&disk->part0, sectors[0]) +
6279 (int)part_stat_read(&disk->part0, sectors[1]) -
6280 atomic_read(&disk->sync_io);
6281 /* sync IO will cause sync_io to increase before the disk_stats
6282 * as sync_io is counted when a request starts, and
6283 * disk_stats is counted when it completes.
6284 * So resync activity will cause curr_events to be smaller than
6285 * when there was no such activity.
6286 * non-sync IO will cause disk_stat to increase without
6287 * increasing sync_io so curr_events will (eventually)
6288 * be larger than it was before. Once it becomes
6289 * substantially larger, the test below will cause
6290 * the array to appear non-idle, and resync will slow
6292 * If there is a lot of outstanding resync activity when
6293 * we set last_event to curr_events, then all that activity
6294 * completing might cause the array to appear non-idle
6295 * and resync will be slowed down even though there might
6296 * not have been non-resync activity. This will only
6297 * happen once though. 'last_events' will soon reflect
6298 * the state where there is little or no outstanding
6299 * resync requests, and further resync activity will
6300 * always make curr_events less than last_events.
6303 if (init || curr_events - rdev->last_events > 64) {
6304 rdev->last_events = curr_events;
6312 void md_done_sync(mddev_t *mddev, int blocks, int ok)
6314 /* another "blocks" (512byte) blocks have been synced */
6315 atomic_sub(blocks, &mddev->recovery_active);
6316 wake_up(&mddev->recovery_wait);
6318 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6319 md_wakeup_thread(mddev->thread);
6320 // stop recovery, signal do_sync ....
6325 /* md_write_start(mddev, bi)
6326 * If we need to update some array metadata (e.g. 'active' flag
6327 * in superblock) before writing, schedule a superblock update
6328 * and wait for it to complete.
6330 void md_write_start(mddev_t *mddev, struct bio *bi)
6333 if (bio_data_dir(bi) != WRITE)
6336 BUG_ON(mddev->ro == 1);
6337 if (mddev->ro == 2) {
6338 /* need to switch to read/write */
6340 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6341 md_wakeup_thread(mddev->thread);
6342 md_wakeup_thread(mddev->sync_thread);
6345 atomic_inc(&mddev->writes_pending);
6346 if (mddev->safemode == 1)
6347 mddev->safemode = 0;
6348 if (mddev->in_sync) {
6349 spin_lock_irq(&mddev->write_lock);
6350 if (mddev->in_sync) {
6352 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6353 md_wakeup_thread(mddev->thread);
6356 spin_unlock_irq(&mddev->write_lock);
6359 sysfs_notify_dirent(mddev->sysfs_state);
6360 wait_event(mddev->sb_wait,
6361 !test_bit(MD_CHANGE_CLEAN, &mddev->flags) &&
6362 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
6365 void md_write_end(mddev_t *mddev)
6367 if (atomic_dec_and_test(&mddev->writes_pending)) {
6368 if (mddev->safemode == 2)
6369 md_wakeup_thread(mddev->thread);
6370 else if (mddev->safemode_delay)
6371 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
6375 /* md_allow_write(mddev)
6376 * Calling this ensures that the array is marked 'active' so that writes
6377 * may proceed without blocking. It is important to call this before
6378 * attempting a GFP_KERNEL allocation while holding the mddev lock.
6379 * Must be called with mddev_lock held.
6381 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
6382 * is dropped, so return -EAGAIN after notifying userspace.
6384 int md_allow_write(mddev_t *mddev)
6390 if (!mddev->pers->sync_request)
6393 spin_lock_irq(&mddev->write_lock);
6394 if (mddev->in_sync) {
6396 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6397 if (mddev->safemode_delay &&
6398 mddev->safemode == 0)
6399 mddev->safemode = 1;
6400 spin_unlock_irq(&mddev->write_lock);
6401 md_update_sb(mddev, 0);
6402 sysfs_notify_dirent(mddev->sysfs_state);
6404 spin_unlock_irq(&mddev->write_lock);
6406 if (test_bit(MD_CHANGE_CLEAN, &mddev->flags))
6411 EXPORT_SYMBOL_GPL(md_allow_write);
6413 #define SYNC_MARKS 10
6414 #define SYNC_MARK_STEP (3*HZ)
6415 void md_do_sync(mddev_t *mddev)
6418 unsigned int currspeed = 0,
6420 sector_t max_sectors,j, io_sectors;
6421 unsigned long mark[SYNC_MARKS];
6422 sector_t mark_cnt[SYNC_MARKS];
6424 struct list_head *tmp;
6425 sector_t last_check;
6430 /* just incase thread restarts... */
6431 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
6433 if (mddev->ro) /* never try to sync a read-only array */
6436 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
6437 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
6438 desc = "data-check";
6439 else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
6440 desc = "requested-resync";
6443 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
6448 /* we overload curr_resync somewhat here.
6449 * 0 == not engaged in resync at all
6450 * 2 == checking that there is no conflict with another sync
6451 * 1 == like 2, but have yielded to allow conflicting resync to
6453 * other == active in resync - this many blocks
6455 * Before starting a resync we must have set curr_resync to
6456 * 2, and then checked that every "conflicting" array has curr_resync
6457 * less than ours. When we find one that is the same or higher
6458 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
6459 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
6460 * This will mean we have to start checking from the beginning again.
6465 mddev->curr_resync = 2;
6468 if (kthread_should_stop()) {
6469 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6472 for_each_mddev(mddev2, tmp) {
6473 if (mddev2 == mddev)
6475 if (!mddev->parallel_resync
6476 && mddev2->curr_resync
6477 && match_mddev_units(mddev, mddev2)) {
6479 if (mddev < mddev2 && mddev->curr_resync == 2) {
6480 /* arbitrarily yield */
6481 mddev->curr_resync = 1;
6482 wake_up(&resync_wait);
6484 if (mddev > mddev2 && mddev->curr_resync == 1)
6485 /* no need to wait here, we can wait the next
6486 * time 'round when curr_resync == 2
6489 /* We need to wait 'interruptible' so as not to
6490 * contribute to the load average, and not to
6491 * be caught by 'softlockup'
6493 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
6494 if (!kthread_should_stop() &&
6495 mddev2->curr_resync >= mddev->curr_resync) {
6496 printk(KERN_INFO "md: delaying %s of %s"
6497 " until %s has finished (they"
6498 " share one or more physical units)\n",
6499 desc, mdname(mddev), mdname(mddev2));
6501 if (signal_pending(current))
6502 flush_signals(current);
6504 finish_wait(&resync_wait, &wq);
6507 finish_wait(&resync_wait, &wq);
6510 } while (mddev->curr_resync < 2);
6513 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
6514 /* resync follows the size requested by the personality,
6515 * which defaults to physical size, but can be virtual size
6517 max_sectors = mddev->resync_max_sectors;
6518 mddev->resync_mismatches = 0;
6519 /* we don't use the checkpoint if there's a bitmap */
6520 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
6521 j = mddev->resync_min;
6522 else if (!mddev->bitmap)
6523 j = mddev->recovery_cp;
6525 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
6526 max_sectors = mddev->dev_sectors;
6528 /* recovery follows the physical size of devices */
6529 max_sectors = mddev->dev_sectors;
6531 list_for_each_entry(rdev, &mddev->disks, same_set)
6532 if (rdev->raid_disk >= 0 &&
6533 !test_bit(Faulty, &rdev->flags) &&
6534 !test_bit(In_sync, &rdev->flags) &&
6535 rdev->recovery_offset < j)
6536 j = rdev->recovery_offset;
6539 printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev));
6540 printk(KERN_INFO "md: minimum _guaranteed_ speed:"
6541 " %d KB/sec/disk.\n", speed_min(mddev));
6542 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
6543 "(but not more than %d KB/sec) for %s.\n",
6544 speed_max(mddev), desc);
6546 is_mddev_idle(mddev, 1); /* this initializes IO event counters */
6549 for (m = 0; m < SYNC_MARKS; m++) {
6551 mark_cnt[m] = io_sectors;
6554 mddev->resync_mark = mark[last_mark];
6555 mddev->resync_mark_cnt = mark_cnt[last_mark];
6558 * Tune reconstruction:
6560 window = 32*(PAGE_SIZE/512);
6561 printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n",
6562 window/2,(unsigned long long) max_sectors/2);
6564 atomic_set(&mddev->recovery_active, 0);
6569 "md: resuming %s of %s from checkpoint.\n",
6570 desc, mdname(mddev));
6571 mddev->curr_resync = j;
6573 mddev->curr_resync_completed = mddev->curr_resync;
6575 while (j < max_sectors) {
6580 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
6581 ((mddev->curr_resync > mddev->curr_resync_completed &&
6582 (mddev->curr_resync - mddev->curr_resync_completed)
6583 > (max_sectors >> 4)) ||
6584 (j - mddev->curr_resync_completed)*2
6585 >= mddev->resync_max - mddev->curr_resync_completed
6587 /* time to update curr_resync_completed */
6588 blk_unplug(mddev->queue);
6589 wait_event(mddev->recovery_wait,
6590 atomic_read(&mddev->recovery_active) == 0);
6591 mddev->curr_resync_completed =
6593 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6594 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
6597 while (j >= mddev->resync_max && !kthread_should_stop()) {
6598 /* As this condition is controlled by user-space,
6599 * we can block indefinitely, so use '_interruptible'
6600 * to avoid triggering warnings.
6602 flush_signals(current); /* just in case */
6603 wait_event_interruptible(mddev->recovery_wait,
6604 mddev->resync_max > j
6605 || kthread_should_stop());
6608 if (kthread_should_stop())
6611 sectors = mddev->pers->sync_request(mddev, j, &skipped,
6612 currspeed < speed_min(mddev));
6614 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6618 if (!skipped) { /* actual IO requested */
6619 io_sectors += sectors;
6620 atomic_add(sectors, &mddev->recovery_active);
6624 if (j>1) mddev->curr_resync = j;
6625 mddev->curr_mark_cnt = io_sectors;
6626 if (last_check == 0)
6627 /* this is the earliers that rebuilt will be
6628 * visible in /proc/mdstat
6630 md_new_event(mddev);
6632 if (last_check + window > io_sectors || j == max_sectors)
6635 last_check = io_sectors;
6637 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
6641 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
6643 int next = (last_mark+1) % SYNC_MARKS;
6645 mddev->resync_mark = mark[next];
6646 mddev->resync_mark_cnt = mark_cnt[next];
6647 mark[next] = jiffies;
6648 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
6653 if (kthread_should_stop())
6658 * this loop exits only if either when we are slower than
6659 * the 'hard' speed limit, or the system was IO-idle for
6661 * the system might be non-idle CPU-wise, but we only care
6662 * about not overloading the IO subsystem. (things like an
6663 * e2fsck being done on the RAID array should execute fast)
6665 blk_unplug(mddev->queue);
6668 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
6669 /((jiffies-mddev->resync_mark)/HZ +1) +1;
6671 if (currspeed > speed_min(mddev)) {
6672 if ((currspeed > speed_max(mddev)) ||
6673 !is_mddev_idle(mddev, 0)) {
6679 printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc);
6681 * this also signals 'finished resyncing' to md_stop
6684 blk_unplug(mddev->queue);
6686 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
6688 /* tell personality that we are finished */
6689 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
6691 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
6692 mddev->curr_resync > 2) {
6693 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
6694 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
6695 if (mddev->curr_resync >= mddev->recovery_cp) {
6697 "md: checkpointing %s of %s.\n",
6698 desc, mdname(mddev));
6699 mddev->recovery_cp = mddev->curr_resync;
6702 mddev->recovery_cp = MaxSector;
6704 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
6705 mddev->curr_resync = MaxSector;
6706 list_for_each_entry(rdev, &mddev->disks, same_set)
6707 if (rdev->raid_disk >= 0 &&
6708 !test_bit(Faulty, &rdev->flags) &&
6709 !test_bit(In_sync, &rdev->flags) &&
6710 rdev->recovery_offset < mddev->curr_resync)
6711 rdev->recovery_offset = mddev->curr_resync;
6714 set_bit(MD_CHANGE_DEVS, &mddev->flags);
6717 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
6718 /* We completed so min/max setting can be forgotten if used. */
6719 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
6720 mddev->resync_min = 0;
6721 mddev->resync_max = MaxSector;
6722 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
6723 mddev->resync_min = mddev->curr_resync_completed;
6724 mddev->curr_resync = 0;
6725 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
6726 mddev->curr_resync_completed = 0;
6727 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
6728 wake_up(&resync_wait);
6729 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
6730 md_wakeup_thread(mddev->thread);
6735 * got a signal, exit.
6738 "md: md_do_sync() got signal ... exiting\n");
6739 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6743 EXPORT_SYMBOL_GPL(md_do_sync);
6746 static int remove_and_add_spares(mddev_t *mddev)
6751 mddev->curr_resync_completed = 0;
6753 list_for_each_entry(rdev, &mddev->disks, same_set)
6754 if (rdev->raid_disk >= 0 &&
6755 !test_bit(Blocked, &rdev->flags) &&
6756 (test_bit(Faulty, &rdev->flags) ||
6757 ! test_bit(In_sync, &rdev->flags)) &&
6758 atomic_read(&rdev->nr_pending)==0) {
6759 if (mddev->pers->hot_remove_disk(
6760 mddev, rdev->raid_disk)==0) {
6762 sprintf(nm,"rd%d", rdev->raid_disk);
6763 sysfs_remove_link(&mddev->kobj, nm);
6764 rdev->raid_disk = -1;
6768 if (mddev->degraded && ! mddev->ro && !mddev->recovery_disabled) {
6769 list_for_each_entry(rdev, &mddev->disks, same_set) {
6770 if (rdev->raid_disk >= 0 &&
6771 !test_bit(In_sync, &rdev->flags) &&
6772 !test_bit(Blocked, &rdev->flags))
6774 if (rdev->raid_disk < 0
6775 && !test_bit(Faulty, &rdev->flags)) {
6776 rdev->recovery_offset = 0;
6778 hot_add_disk(mddev, rdev) == 0) {
6780 sprintf(nm, "rd%d", rdev->raid_disk);
6781 if (sysfs_create_link(&mddev->kobj,
6784 "md: cannot register "
6788 md_new_event(mddev);
6797 * This routine is regularly called by all per-raid-array threads to
6798 * deal with generic issues like resync and super-block update.
6799 * Raid personalities that don't have a thread (linear/raid0) do not
6800 * need this as they never do any recovery or update the superblock.
6802 * It does not do any resync itself, but rather "forks" off other threads
6803 * to do that as needed.
6804 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
6805 * "->recovery" and create a thread at ->sync_thread.
6806 * When the thread finishes it sets MD_RECOVERY_DONE
6807 * and wakeups up this thread which will reap the thread and finish up.
6808 * This thread also removes any faulty devices (with nr_pending == 0).
6810 * The overall approach is:
6811 * 1/ if the superblock needs updating, update it.
6812 * 2/ If a recovery thread is running, don't do anything else.
6813 * 3/ If recovery has finished, clean up, possibly marking spares active.
6814 * 4/ If there are any faulty devices, remove them.
6815 * 5/ If array is degraded, try to add spares devices
6816 * 6/ If array has spares or is not in-sync, start a resync thread.
6818 void md_check_recovery(mddev_t *mddev)
6824 bitmap_daemon_work(mddev);
6829 if (signal_pending(current)) {
6830 if (mddev->pers->sync_request && !mddev->external) {
6831 printk(KERN_INFO "md: %s in immediate safe mode\n",
6833 mddev->safemode = 2;
6835 flush_signals(current);
6838 if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
6841 (mddev->flags && !mddev->external) ||
6842 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
6843 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
6844 (mddev->external == 0 && mddev->safemode == 1) ||
6845 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
6846 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
6850 if (mddev_trylock(mddev)) {
6854 /* Only thing we do on a ro array is remove
6857 remove_and_add_spares(mddev);
6858 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6862 if (!mddev->external) {
6864 spin_lock_irq(&mddev->write_lock);
6865 if (mddev->safemode &&
6866 !atomic_read(&mddev->writes_pending) &&
6868 mddev->recovery_cp == MaxSector) {
6871 if (mddev->persistent)
6872 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6874 if (mddev->safemode == 1)
6875 mddev->safemode = 0;
6876 spin_unlock_irq(&mddev->write_lock);
6878 sysfs_notify_dirent(mddev->sysfs_state);
6882 md_update_sb(mddev, 0);
6884 list_for_each_entry(rdev, &mddev->disks, same_set)
6885 if (test_and_clear_bit(StateChanged, &rdev->flags))
6886 sysfs_notify_dirent(rdev->sysfs_state);
6889 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
6890 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
6891 /* resync/recovery still happening */
6892 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6895 if (mddev->sync_thread) {
6896 /* resync has finished, collect result */
6897 md_unregister_thread(mddev->sync_thread);
6898 mddev->sync_thread = NULL;
6899 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
6900 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
6902 /* activate any spares */
6903 if (mddev->pers->spare_active(mddev))
6904 sysfs_notify(&mddev->kobj, NULL,
6907 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
6908 mddev->pers->finish_reshape)
6909 mddev->pers->finish_reshape(mddev);
6910 md_update_sb(mddev, 1);
6912 /* if array is no-longer degraded, then any saved_raid_disk
6913 * information must be scrapped
6915 if (!mddev->degraded)
6916 list_for_each_entry(rdev, &mddev->disks, same_set)
6917 rdev->saved_raid_disk = -1;
6919 mddev->recovery = 0;
6920 /* flag recovery needed just to double check */
6921 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6922 sysfs_notify_dirent(mddev->sysfs_action);
6923 md_new_event(mddev);
6926 /* Set RUNNING before clearing NEEDED to avoid
6927 * any transients in the value of "sync_action".
6929 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
6930 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6931 /* Clear some bits that don't mean anything, but
6934 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
6935 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
6937 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
6939 /* no recovery is running.
6940 * remove any failed drives, then
6941 * add spares if possible.
6942 * Spare are also removed and re-added, to allow
6943 * the personality to fail the re-add.
6946 if (mddev->reshape_position != MaxSector) {
6947 if (mddev->pers->check_reshape == NULL ||
6948 mddev->pers->check_reshape(mddev) != 0)
6949 /* Cannot proceed */
6951 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
6952 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6953 } else if ((spares = remove_and_add_spares(mddev))) {
6954 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
6955 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
6956 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
6957 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6958 } else if (mddev->recovery_cp < MaxSector) {
6959 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
6960 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6961 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
6962 /* nothing to be done ... */
6965 if (mddev->pers->sync_request) {
6966 if (spares && mddev->bitmap && ! mddev->bitmap->file) {
6967 /* We are adding a device or devices to an array
6968 * which has the bitmap stored on all devices.
6969 * So make sure all bitmap pages get written
6971 bitmap_write_all(mddev->bitmap);
6973 mddev->sync_thread = md_register_thread(md_do_sync,
6976 if (!mddev->sync_thread) {
6977 printk(KERN_ERR "%s: could not start resync"
6980 /* leave the spares where they are, it shouldn't hurt */
6981 mddev->recovery = 0;
6983 md_wakeup_thread(mddev->sync_thread);
6984 sysfs_notify_dirent(mddev->sysfs_action);
6985 md_new_event(mddev);
6988 if (!mddev->sync_thread) {
6989 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
6990 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
6992 if (mddev->sysfs_action)
6993 sysfs_notify_dirent(mddev->sysfs_action);
6995 mddev_unlock(mddev);
6999 void md_wait_for_blocked_rdev(mdk_rdev_t *rdev, mddev_t *mddev)
7001 sysfs_notify_dirent(rdev->sysfs_state);
7002 wait_event_timeout(rdev->blocked_wait,
7003 !test_bit(Blocked, &rdev->flags),
7004 msecs_to_jiffies(5000));
7005 rdev_dec_pending(rdev, mddev);
7007 EXPORT_SYMBOL(md_wait_for_blocked_rdev);
7009 static int md_notify_reboot(struct notifier_block *this,
7010 unsigned long code, void *x)
7012 struct list_head *tmp;
7015 if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) {
7017 printk(KERN_INFO "md: stopping all md devices.\n");
7019 for_each_mddev(mddev, tmp)
7020 if (mddev_trylock(mddev)) {
7021 /* Force a switch to readonly even array
7022 * appears to still be in use. Hence
7025 do_md_stop(mddev, 1, 100);
7026 mddev_unlock(mddev);
7029 * certain more exotic SCSI devices are known to be
7030 * volatile wrt too early system reboots. While the
7031 * right place to handle this issue is the given
7032 * driver, we do want to have a safe RAID driver ...
7039 static struct notifier_block md_notifier = {
7040 .notifier_call = md_notify_reboot,
7042 .priority = INT_MAX, /* before any real devices */
7045 static void md_geninit(void)
7047 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
7049 proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops);
7052 static int __init md_init(void)
7054 if (register_blkdev(MD_MAJOR, "md"))
7056 if ((mdp_major=register_blkdev(0, "mdp"))<=0) {
7057 unregister_blkdev(MD_MAJOR, "md");
7060 blk_register_region(MKDEV(MD_MAJOR, 0), 1UL<<MINORBITS, THIS_MODULE,
7061 md_probe, NULL, NULL);
7062 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
7063 md_probe, NULL, NULL);
7065 register_reboot_notifier(&md_notifier);
7066 raid_table_header = register_sysctl_table(raid_root_table);
7076 * Searches all registered partitions for autorun RAID arrays
7080 static LIST_HEAD(all_detected_devices);
7081 struct detected_devices_node {
7082 struct list_head list;
7086 void md_autodetect_dev(dev_t dev)
7088 struct detected_devices_node *node_detected_dev;
7090 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
7091 if (node_detected_dev) {
7092 node_detected_dev->dev = dev;
7093 list_add_tail(&node_detected_dev->list, &all_detected_devices);
7095 printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed"
7096 ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev));
7101 static void autostart_arrays(int part)
7104 struct detected_devices_node *node_detected_dev;
7106 int i_scanned, i_passed;
7111 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
7113 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
7115 node_detected_dev = list_entry(all_detected_devices.next,
7116 struct detected_devices_node, list);
7117 list_del(&node_detected_dev->list);
7118 dev = node_detected_dev->dev;
7119 kfree(node_detected_dev);
7120 rdev = md_import_device(dev,0, 90);
7124 if (test_bit(Faulty, &rdev->flags)) {
7128 set_bit(AutoDetected, &rdev->flags);
7129 list_add(&rdev->same_set, &pending_raid_disks);
7133 printk(KERN_INFO "md: Scanned %d and added %d devices.\n",
7134 i_scanned, i_passed);
7136 autorun_devices(part);
7139 #endif /* !MODULE */
7141 static __exit void md_exit(void)
7144 struct list_head *tmp;
7146 blk_unregister_region(MKDEV(MD_MAJOR,0), 1U << MINORBITS);
7147 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
7149 unregister_blkdev(MD_MAJOR,"md");
7150 unregister_blkdev(mdp_major, "mdp");
7151 unregister_reboot_notifier(&md_notifier);
7152 unregister_sysctl_table(raid_table_header);
7153 remove_proc_entry("mdstat", NULL);
7154 for_each_mddev(mddev, tmp) {
7155 export_array(mddev);
7156 mddev->hold_active = 0;
7160 subsys_initcall(md_init);
7161 module_exit(md_exit)
7163 static int get_ro(char *buffer, struct kernel_param *kp)
7165 return sprintf(buffer, "%d", start_readonly);
7167 static int set_ro(const char *val, struct kernel_param *kp)
7170 int num = simple_strtoul(val, &e, 10);
7171 if (*val && (*e == '\0' || *e == '\n')) {
7172 start_readonly = num;
7178 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
7179 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
7181 module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR);
7183 EXPORT_SYMBOL(register_md_personality);
7184 EXPORT_SYMBOL(unregister_md_personality);
7185 EXPORT_SYMBOL(md_error);
7186 EXPORT_SYMBOL(md_done_sync);
7187 EXPORT_SYMBOL(md_write_start);
7188 EXPORT_SYMBOL(md_write_end);
7189 EXPORT_SYMBOL(md_register_thread);
7190 EXPORT_SYMBOL(md_unregister_thread);
7191 EXPORT_SYMBOL(md_wakeup_thread);
7192 EXPORT_SYMBOL(md_check_recovery);
7193 MODULE_LICENSE("GPL");
7194 MODULE_DESCRIPTION("MD RAID framework");
7196 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);