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/delay.h>
48 #include <linux/raid/md_p.h>
49 #include <linux/raid/md_u.h>
54 #define dprintk(x...) ((void)(DEBUG && printk(x)))
58 static void autostart_arrays(int part);
61 static LIST_HEAD(pers_list);
62 static DEFINE_SPINLOCK(pers_lock);
64 static void md_print_devices(void);
66 static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
68 #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
71 * Default number of read corrections we'll attempt on an rdev
72 * before ejecting it from the array. We divide the read error
73 * count by 2 for every hour elapsed between read errors.
75 #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
77 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
78 * is 1000 KB/sec, so the extra system load does not show up that much.
79 * Increase it if you want to have more _guaranteed_ speed. Note that
80 * the RAID driver will use the maximum available bandwidth if the IO
81 * subsystem is idle. There is also an 'absolute maximum' reconstruction
82 * speed limit - in case reconstruction slows down your system despite
85 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
86 * or /sys/block/mdX/md/sync_speed_{min,max}
89 static int sysctl_speed_limit_min = 1000;
90 static int sysctl_speed_limit_max = 200000;
91 static inline int speed_min(mddev_t *mddev)
93 return mddev->sync_speed_min ?
94 mddev->sync_speed_min : sysctl_speed_limit_min;
97 static inline int speed_max(mddev_t *mddev)
99 return mddev->sync_speed_max ?
100 mddev->sync_speed_max : sysctl_speed_limit_max;
103 static struct ctl_table_header *raid_table_header;
105 static ctl_table raid_table[] = {
107 .procname = "speed_limit_min",
108 .data = &sysctl_speed_limit_min,
109 .maxlen = sizeof(int),
110 .mode = S_IRUGO|S_IWUSR,
111 .proc_handler = proc_dointvec,
114 .procname = "speed_limit_max",
115 .data = &sysctl_speed_limit_max,
116 .maxlen = sizeof(int),
117 .mode = S_IRUGO|S_IWUSR,
118 .proc_handler = proc_dointvec,
123 static ctl_table raid_dir_table[] = {
127 .mode = S_IRUGO|S_IXUGO,
133 static ctl_table raid_root_table[] = {
138 .child = raid_dir_table,
143 static const struct block_device_operations md_fops;
145 static int start_readonly;
148 * We have a system wide 'event count' that is incremented
149 * on any 'interesting' event, and readers of /proc/mdstat
150 * can use 'poll' or 'select' to find out when the event
154 * start array, stop array, error, add device, remove device,
155 * start build, activate spare
157 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
158 static atomic_t md_event_count;
159 void md_new_event(mddev_t *mddev)
161 atomic_inc(&md_event_count);
162 wake_up(&md_event_waiters);
164 EXPORT_SYMBOL_GPL(md_new_event);
166 /* Alternate version that can be called from interrupts
167 * when calling sysfs_notify isn't needed.
169 static void md_new_event_inintr(mddev_t *mddev)
171 atomic_inc(&md_event_count);
172 wake_up(&md_event_waiters);
176 * Enables to iterate over all existing md arrays
177 * all_mddevs_lock protects this list.
179 static LIST_HEAD(all_mddevs);
180 static DEFINE_SPINLOCK(all_mddevs_lock);
184 * iterates through all used mddevs in the system.
185 * We take care to grab the all_mddevs_lock whenever navigating
186 * the list, and to always hold a refcount when unlocked.
187 * Any code which breaks out of this loop while own
188 * a reference to the current mddev and must mddev_put it.
190 #define for_each_mddev(mddev,tmp) \
192 for (({ spin_lock(&all_mddevs_lock); \
193 tmp = all_mddevs.next; \
195 ({ if (tmp != &all_mddevs) \
196 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
197 spin_unlock(&all_mddevs_lock); \
198 if (mddev) mddev_put(mddev); \
199 mddev = list_entry(tmp, mddev_t, all_mddevs); \
200 tmp != &all_mddevs;}); \
201 ({ spin_lock(&all_mddevs_lock); \
206 /* Rather than calling directly into the personality make_request function,
207 * IO requests come here first so that we can check if the device is
208 * being suspended pending a reconfiguration.
209 * We hold a refcount over the call to ->make_request. By the time that
210 * call has finished, the bio has been linked into some internal structure
211 * and so is visible to ->quiesce(), so we don't need the refcount any more.
213 static int md_make_request(struct request_queue *q, struct bio *bio)
215 mddev_t *mddev = q->queuedata;
217 if (mddev == NULL || mddev->pers == NULL) {
222 if (mddev->suspended || mddev->barrier) {
225 prepare_to_wait(&mddev->sb_wait, &__wait,
226 TASK_UNINTERRUPTIBLE);
227 if (!mddev->suspended && !mddev->barrier)
233 finish_wait(&mddev->sb_wait, &__wait);
235 atomic_inc(&mddev->active_io);
237 rv = mddev->pers->make_request(q, bio);
238 if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended)
239 wake_up(&mddev->sb_wait);
244 static void mddev_suspend(mddev_t *mddev)
246 BUG_ON(mddev->suspended);
247 mddev->suspended = 1;
249 wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0);
250 mddev->pers->quiesce(mddev, 1);
251 md_unregister_thread(mddev->thread);
252 mddev->thread = NULL;
253 /* we now know that no code is executing in the personality module,
254 * except possibly the tail end of a ->bi_end_io function, but that
255 * is certain to complete before the module has a chance to get
260 static void mddev_resume(mddev_t *mddev)
262 mddev->suspended = 0;
263 wake_up(&mddev->sb_wait);
264 mddev->pers->quiesce(mddev, 0);
267 int mddev_congested(mddev_t *mddev, int bits)
271 return mddev->suspended;
273 EXPORT_SYMBOL(mddev_congested);
276 * Generic barrier handling for md
279 #define POST_REQUEST_BARRIER ((void*)1)
281 static void md_end_barrier(struct bio *bio, int err)
283 mdk_rdev_t *rdev = bio->bi_private;
284 mddev_t *mddev = rdev->mddev;
285 if (err == -EOPNOTSUPP && mddev->barrier != POST_REQUEST_BARRIER)
286 set_bit(BIO_EOPNOTSUPP, &mddev->barrier->bi_flags);
288 rdev_dec_pending(rdev, mddev);
290 if (atomic_dec_and_test(&mddev->flush_pending)) {
291 if (mddev->barrier == POST_REQUEST_BARRIER) {
292 /* This was a post-request barrier */
293 mddev->barrier = NULL;
294 wake_up(&mddev->sb_wait);
296 /* The pre-request barrier has finished */
297 schedule_work(&mddev->barrier_work);
302 static void submit_barriers(mddev_t *mddev)
307 list_for_each_entry_rcu(rdev, &mddev->disks, same_set)
308 if (rdev->raid_disk >= 0 &&
309 !test_bit(Faulty, &rdev->flags)) {
310 /* Take two references, one is dropped
311 * when request finishes, one after
312 * we reclaim rcu_read_lock
315 atomic_inc(&rdev->nr_pending);
316 atomic_inc(&rdev->nr_pending);
318 bi = bio_alloc(GFP_KERNEL, 0);
319 bi->bi_end_io = md_end_barrier;
320 bi->bi_private = rdev;
321 bi->bi_bdev = rdev->bdev;
322 atomic_inc(&mddev->flush_pending);
323 submit_bio(WRITE_BARRIER, bi);
325 rdev_dec_pending(rdev, mddev);
330 static void md_submit_barrier(struct work_struct *ws)
332 mddev_t *mddev = container_of(ws, mddev_t, barrier_work);
333 struct bio *bio = mddev->barrier;
335 atomic_set(&mddev->flush_pending, 1);
337 if (test_bit(BIO_EOPNOTSUPP, &bio->bi_flags))
338 bio_endio(bio, -EOPNOTSUPP);
339 else if (bio->bi_size == 0)
340 /* an empty barrier - all done */
343 bio->bi_rw &= ~(1<<BIO_RW_BARRIER);
344 if (mddev->pers->make_request(mddev->queue, bio))
345 generic_make_request(bio);
346 mddev->barrier = POST_REQUEST_BARRIER;
347 submit_barriers(mddev);
349 if (atomic_dec_and_test(&mddev->flush_pending)) {
350 mddev->barrier = NULL;
351 wake_up(&mddev->sb_wait);
355 void md_barrier_request(mddev_t *mddev, struct bio *bio)
357 spin_lock_irq(&mddev->write_lock);
358 wait_event_lock_irq(mddev->sb_wait,
360 mddev->write_lock, /*nothing*/);
361 mddev->barrier = bio;
362 spin_unlock_irq(&mddev->write_lock);
364 atomic_set(&mddev->flush_pending, 1);
365 INIT_WORK(&mddev->barrier_work, md_submit_barrier);
367 submit_barriers(mddev);
369 if (atomic_dec_and_test(&mddev->flush_pending))
370 schedule_work(&mddev->barrier_work);
372 EXPORT_SYMBOL(md_barrier_request);
374 static inline mddev_t *mddev_get(mddev_t *mddev)
376 atomic_inc(&mddev->active);
380 static void mddev_delayed_delete(struct work_struct *ws);
382 static void mddev_put(mddev_t *mddev)
384 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
386 if (!mddev->raid_disks && list_empty(&mddev->disks) &&
387 !mddev->hold_active) {
388 list_del(&mddev->all_mddevs);
389 if (mddev->gendisk) {
390 /* we did a probe so need to clean up.
391 * Call schedule_work inside the spinlock
392 * so that flush_scheduled_work() after
393 * mddev_find will succeed in waiting for the
396 INIT_WORK(&mddev->del_work, mddev_delayed_delete);
397 schedule_work(&mddev->del_work);
401 spin_unlock(&all_mddevs_lock);
404 static mddev_t * mddev_find(dev_t unit)
406 mddev_t *mddev, *new = NULL;
409 spin_lock(&all_mddevs_lock);
412 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
413 if (mddev->unit == unit) {
415 spin_unlock(&all_mddevs_lock);
421 list_add(&new->all_mddevs, &all_mddevs);
422 spin_unlock(&all_mddevs_lock);
423 new->hold_active = UNTIL_IOCTL;
427 /* find an unused unit number */
428 static int next_minor = 512;
429 int start = next_minor;
433 dev = MKDEV(MD_MAJOR, next_minor);
435 if (next_minor > MINORMASK)
437 if (next_minor == start) {
438 /* Oh dear, all in use. */
439 spin_unlock(&all_mddevs_lock);
445 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
446 if (mddev->unit == dev) {
452 new->md_minor = MINOR(dev);
453 new->hold_active = UNTIL_STOP;
454 list_add(&new->all_mddevs, &all_mddevs);
455 spin_unlock(&all_mddevs_lock);
458 spin_unlock(&all_mddevs_lock);
460 new = kzalloc(sizeof(*new), GFP_KERNEL);
465 if (MAJOR(unit) == MD_MAJOR)
466 new->md_minor = MINOR(unit);
468 new->md_minor = MINOR(unit) >> MdpMinorShift;
470 mutex_init(&new->open_mutex);
471 mutex_init(&new->reconfig_mutex);
472 mutex_init(&new->bitmap_info.mutex);
473 INIT_LIST_HEAD(&new->disks);
474 INIT_LIST_HEAD(&new->all_mddevs);
475 init_timer(&new->safemode_timer);
476 atomic_set(&new->active, 1);
477 atomic_set(&new->openers, 0);
478 atomic_set(&new->active_io, 0);
479 spin_lock_init(&new->write_lock);
480 atomic_set(&new->flush_pending, 0);
481 init_waitqueue_head(&new->sb_wait);
482 init_waitqueue_head(&new->recovery_wait);
483 new->reshape_position = MaxSector;
485 new->resync_max = MaxSector;
486 new->level = LEVEL_NONE;
491 static inline int mddev_lock(mddev_t * mddev)
493 return mutex_lock_interruptible(&mddev->reconfig_mutex);
496 static inline int mddev_is_locked(mddev_t *mddev)
498 return mutex_is_locked(&mddev->reconfig_mutex);
501 static inline int mddev_trylock(mddev_t * mddev)
503 return mutex_trylock(&mddev->reconfig_mutex);
506 static inline void mddev_unlock(mddev_t * mddev)
508 mutex_unlock(&mddev->reconfig_mutex);
510 md_wakeup_thread(mddev->thread);
513 static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr)
517 list_for_each_entry(rdev, &mddev->disks, same_set)
518 if (rdev->desc_nr == nr)
524 static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev)
528 list_for_each_entry(rdev, &mddev->disks, same_set)
529 if (rdev->bdev->bd_dev == dev)
535 static struct mdk_personality *find_pers(int level, char *clevel)
537 struct mdk_personality *pers;
538 list_for_each_entry(pers, &pers_list, list) {
539 if (level != LEVEL_NONE && pers->level == level)
541 if (strcmp(pers->name, clevel)==0)
547 /* return the offset of the super block in 512byte sectors */
548 static inline sector_t calc_dev_sboffset(struct block_device *bdev)
550 sector_t num_sectors = bdev->bd_inode->i_size / 512;
551 return MD_NEW_SIZE_SECTORS(num_sectors);
554 static int alloc_disk_sb(mdk_rdev_t * rdev)
559 rdev->sb_page = alloc_page(GFP_KERNEL);
560 if (!rdev->sb_page) {
561 printk(KERN_ALERT "md: out of memory.\n");
568 static void free_disk_sb(mdk_rdev_t * rdev)
571 put_page(rdev->sb_page);
573 rdev->sb_page = NULL;
580 static void super_written(struct bio *bio, int error)
582 mdk_rdev_t *rdev = bio->bi_private;
583 mddev_t *mddev = rdev->mddev;
585 if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) {
586 printk("md: super_written gets error=%d, uptodate=%d\n",
587 error, test_bit(BIO_UPTODATE, &bio->bi_flags));
588 WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags));
589 md_error(mddev, rdev);
592 if (atomic_dec_and_test(&mddev->pending_writes))
593 wake_up(&mddev->sb_wait);
597 static void super_written_barrier(struct bio *bio, int error)
599 struct bio *bio2 = bio->bi_private;
600 mdk_rdev_t *rdev = bio2->bi_private;
601 mddev_t *mddev = rdev->mddev;
603 if (!test_bit(BIO_UPTODATE, &bio->bi_flags) &&
604 error == -EOPNOTSUPP) {
606 /* barriers don't appear to be supported :-( */
607 set_bit(BarriersNotsupp, &rdev->flags);
608 mddev->barriers_work = 0;
609 spin_lock_irqsave(&mddev->write_lock, flags);
610 bio2->bi_next = mddev->biolist;
611 mddev->biolist = bio2;
612 spin_unlock_irqrestore(&mddev->write_lock, flags);
613 wake_up(&mddev->sb_wait);
617 bio->bi_private = rdev;
618 super_written(bio, error);
622 void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
623 sector_t sector, int size, struct page *page)
625 /* write first size bytes of page to sector of rdev
626 * Increment mddev->pending_writes before returning
627 * and decrement it on completion, waking up sb_wait
628 * if zero is reached.
629 * If an error occurred, call md_error
631 * As we might need to resubmit the request if BIO_RW_BARRIER
632 * causes ENOTSUPP, we allocate a spare bio...
634 struct bio *bio = bio_alloc(GFP_NOIO, 1);
635 int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNCIO) | (1<<BIO_RW_UNPLUG);
637 bio->bi_bdev = rdev->bdev;
638 bio->bi_sector = sector;
639 bio_add_page(bio, page, size, 0);
640 bio->bi_private = rdev;
641 bio->bi_end_io = super_written;
644 atomic_inc(&mddev->pending_writes);
645 if (!test_bit(BarriersNotsupp, &rdev->flags)) {
647 rw |= (1<<BIO_RW_BARRIER);
648 rbio = bio_clone(bio, GFP_NOIO);
649 rbio->bi_private = bio;
650 rbio->bi_end_io = super_written_barrier;
651 submit_bio(rw, rbio);
656 void md_super_wait(mddev_t *mddev)
658 /* wait for all superblock writes that were scheduled to complete.
659 * if any had to be retried (due to BARRIER problems), retry them
663 prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE);
664 if (atomic_read(&mddev->pending_writes)==0)
666 while (mddev->biolist) {
668 spin_lock_irq(&mddev->write_lock);
669 bio = mddev->biolist;
670 mddev->biolist = bio->bi_next ;
672 spin_unlock_irq(&mddev->write_lock);
673 submit_bio(bio->bi_rw, bio);
677 finish_wait(&mddev->sb_wait, &wq);
680 static void bi_complete(struct bio *bio, int error)
682 complete((struct completion*)bio->bi_private);
685 int sync_page_io(struct block_device *bdev, sector_t sector, int size,
686 struct page *page, int rw)
688 struct bio *bio = bio_alloc(GFP_NOIO, 1);
689 struct completion event;
692 rw |= (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_UNPLUG);
695 bio->bi_sector = sector;
696 bio_add_page(bio, page, size, 0);
697 init_completion(&event);
698 bio->bi_private = &event;
699 bio->bi_end_io = bi_complete;
701 wait_for_completion(&event);
703 ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
707 EXPORT_SYMBOL_GPL(sync_page_io);
709 static int read_disk_sb(mdk_rdev_t * rdev, int size)
711 char b[BDEVNAME_SIZE];
712 if (!rdev->sb_page) {
720 if (!sync_page_io(rdev->bdev, rdev->sb_start, size, rdev->sb_page, READ))
726 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
727 bdevname(rdev->bdev,b));
731 static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
733 return sb1->set_uuid0 == sb2->set_uuid0 &&
734 sb1->set_uuid1 == sb2->set_uuid1 &&
735 sb1->set_uuid2 == sb2->set_uuid2 &&
736 sb1->set_uuid3 == sb2->set_uuid3;
739 static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
742 mdp_super_t *tmp1, *tmp2;
744 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
745 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
747 if (!tmp1 || !tmp2) {
749 printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n");
757 * nr_disks is not constant
762 ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0);
770 static u32 md_csum_fold(u32 csum)
772 csum = (csum & 0xffff) + (csum >> 16);
773 return (csum & 0xffff) + (csum >> 16);
776 static unsigned int calc_sb_csum(mdp_super_t * sb)
779 u32 *sb32 = (u32*)sb;
781 unsigned int disk_csum, csum;
783 disk_csum = sb->sb_csum;
786 for (i = 0; i < MD_SB_BYTES/4 ; i++)
788 csum = (newcsum & 0xffffffff) + (newcsum>>32);
792 /* This used to use csum_partial, which was wrong for several
793 * reasons including that different results are returned on
794 * different architectures. It isn't critical that we get exactly
795 * the same return value as before (we always csum_fold before
796 * testing, and that removes any differences). However as we
797 * know that csum_partial always returned a 16bit value on
798 * alphas, do a fold to maximise conformity to previous behaviour.
800 sb->sb_csum = md_csum_fold(disk_csum);
802 sb->sb_csum = disk_csum;
809 * Handle superblock details.
810 * We want to be able to handle multiple superblock formats
811 * so we have a common interface to them all, and an array of
812 * different handlers.
813 * We rely on user-space to write the initial superblock, and support
814 * reading and updating of superblocks.
815 * Interface methods are:
816 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
817 * loads and validates a superblock on dev.
818 * if refdev != NULL, compare superblocks on both devices
820 * 0 - dev has a superblock that is compatible with refdev
821 * 1 - dev has a superblock that is compatible and newer than refdev
822 * so dev should be used as the refdev in future
823 * -EINVAL superblock incompatible or invalid
824 * -othererror e.g. -EIO
826 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
827 * Verify that dev is acceptable into mddev.
828 * The first time, mddev->raid_disks will be 0, and data from
829 * dev should be merged in. Subsequent calls check that dev
830 * is new enough. Return 0 or -EINVAL
832 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
833 * Update the superblock for rdev with data in mddev
834 * This does not write to disc.
840 struct module *owner;
841 int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev,
843 int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev);
844 void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev);
845 unsigned long long (*rdev_size_change)(mdk_rdev_t *rdev,
846 sector_t num_sectors);
850 * Check that the given mddev has no bitmap.
852 * This function is called from the run method of all personalities that do not
853 * support bitmaps. It prints an error message and returns non-zero if mddev
854 * has a bitmap. Otherwise, it returns 0.
857 int md_check_no_bitmap(mddev_t *mddev)
859 if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset)
861 printk(KERN_ERR "%s: bitmaps are not supported for %s\n",
862 mdname(mddev), mddev->pers->name);
865 EXPORT_SYMBOL(md_check_no_bitmap);
868 * load_super for 0.90.0
870 static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
872 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
877 * Calculate the position of the superblock (512byte sectors),
878 * it's at the end of the disk.
880 * It also happens to be a multiple of 4Kb.
882 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
884 ret = read_disk_sb(rdev, MD_SB_BYTES);
889 bdevname(rdev->bdev, b);
890 sb = (mdp_super_t*)page_address(rdev->sb_page);
892 if (sb->md_magic != MD_SB_MAGIC) {
893 printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
898 if (sb->major_version != 0 ||
899 sb->minor_version < 90 ||
900 sb->minor_version > 91) {
901 printk(KERN_WARNING "Bad version number %d.%d on %s\n",
902 sb->major_version, sb->minor_version,
907 if (sb->raid_disks <= 0)
910 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
911 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
916 rdev->preferred_minor = sb->md_minor;
917 rdev->data_offset = 0;
918 rdev->sb_size = MD_SB_BYTES;
920 if (sb->level == LEVEL_MULTIPATH)
923 rdev->desc_nr = sb->this_disk.number;
929 mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page);
930 if (!uuid_equal(refsb, sb)) {
931 printk(KERN_WARNING "md: %s has different UUID to %s\n",
932 b, bdevname(refdev->bdev,b2));
935 if (!sb_equal(refsb, sb)) {
936 printk(KERN_WARNING "md: %s has same UUID"
937 " but different superblock to %s\n",
938 b, bdevname(refdev->bdev, b2));
942 ev2 = md_event(refsb);
948 rdev->sectors = rdev->sb_start;
950 if (rdev->sectors < sb->size * 2 && sb->level > 1)
951 /* "this cannot possibly happen" ... */
959 * validate_super for 0.90.0
961 static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
964 mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page);
965 __u64 ev1 = md_event(sb);
967 rdev->raid_disk = -1;
968 clear_bit(Faulty, &rdev->flags);
969 clear_bit(In_sync, &rdev->flags);
970 clear_bit(WriteMostly, &rdev->flags);
971 clear_bit(BarriersNotsupp, &rdev->flags);
973 if (mddev->raid_disks == 0) {
974 mddev->major_version = 0;
975 mddev->minor_version = sb->minor_version;
976 mddev->patch_version = sb->patch_version;
978 mddev->chunk_sectors = sb->chunk_size >> 9;
979 mddev->ctime = sb->ctime;
980 mddev->utime = sb->utime;
981 mddev->level = sb->level;
982 mddev->clevel[0] = 0;
983 mddev->layout = sb->layout;
984 mddev->raid_disks = sb->raid_disks;
985 mddev->dev_sectors = sb->size * 2;
987 mddev->bitmap_info.offset = 0;
988 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
990 if (mddev->minor_version >= 91) {
991 mddev->reshape_position = sb->reshape_position;
992 mddev->delta_disks = sb->delta_disks;
993 mddev->new_level = sb->new_level;
994 mddev->new_layout = sb->new_layout;
995 mddev->new_chunk_sectors = sb->new_chunk >> 9;
997 mddev->reshape_position = MaxSector;
998 mddev->delta_disks = 0;
999 mddev->new_level = mddev->level;
1000 mddev->new_layout = mddev->layout;
1001 mddev->new_chunk_sectors = mddev->chunk_sectors;
1004 if (sb->state & (1<<MD_SB_CLEAN))
1005 mddev->recovery_cp = MaxSector;
1007 if (sb->events_hi == sb->cp_events_hi &&
1008 sb->events_lo == sb->cp_events_lo) {
1009 mddev->recovery_cp = sb->recovery_cp;
1011 mddev->recovery_cp = 0;
1014 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
1015 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
1016 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
1017 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
1019 mddev->max_disks = MD_SB_DISKS;
1021 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
1022 mddev->bitmap_info.file == NULL)
1023 mddev->bitmap_info.offset =
1024 mddev->bitmap_info.default_offset;
1026 } else if (mddev->pers == NULL) {
1027 /* Insist on good event counter while assembling */
1029 if (ev1 < mddev->events)
1031 } else if (mddev->bitmap) {
1032 /* if adding to array with a bitmap, then we can accept an
1033 * older device ... but not too old.
1035 if (ev1 < mddev->bitmap->events_cleared)
1038 if (ev1 < mddev->events)
1039 /* just a hot-add of a new device, leave raid_disk at -1 */
1043 if (mddev->level != LEVEL_MULTIPATH) {
1044 desc = sb->disks + rdev->desc_nr;
1046 if (desc->state & (1<<MD_DISK_FAULTY))
1047 set_bit(Faulty, &rdev->flags);
1048 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
1049 desc->raid_disk < mddev->raid_disks */) {
1050 set_bit(In_sync, &rdev->flags);
1051 rdev->raid_disk = desc->raid_disk;
1052 } else if (desc->state & (1<<MD_DISK_ACTIVE)) {
1053 /* active but not in sync implies recovery up to
1054 * reshape position. We don't know exactly where
1055 * that is, so set to zero for now */
1056 if (mddev->minor_version >= 91) {
1057 rdev->recovery_offset = 0;
1058 rdev->raid_disk = desc->raid_disk;
1061 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
1062 set_bit(WriteMostly, &rdev->flags);
1063 } else /* MULTIPATH are always insync */
1064 set_bit(In_sync, &rdev->flags);
1069 * sync_super for 0.90.0
1071 static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1075 int next_spare = mddev->raid_disks;
1078 /* make rdev->sb match mddev data..
1081 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1082 * 3/ any empty disks < next_spare become removed
1084 * disks[0] gets initialised to REMOVED because
1085 * we cannot be sure from other fields if it has
1086 * been initialised or not.
1089 int active=0, working=0,failed=0,spare=0,nr_disks=0;
1091 rdev->sb_size = MD_SB_BYTES;
1093 sb = (mdp_super_t*)page_address(rdev->sb_page);
1095 memset(sb, 0, sizeof(*sb));
1097 sb->md_magic = MD_SB_MAGIC;
1098 sb->major_version = mddev->major_version;
1099 sb->patch_version = mddev->patch_version;
1100 sb->gvalid_words = 0; /* ignored */
1101 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
1102 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
1103 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
1104 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
1106 sb->ctime = mddev->ctime;
1107 sb->level = mddev->level;
1108 sb->size = mddev->dev_sectors / 2;
1109 sb->raid_disks = mddev->raid_disks;
1110 sb->md_minor = mddev->md_minor;
1111 sb->not_persistent = 0;
1112 sb->utime = mddev->utime;
1114 sb->events_hi = (mddev->events>>32);
1115 sb->events_lo = (u32)mddev->events;
1117 if (mddev->reshape_position == MaxSector)
1118 sb->minor_version = 90;
1120 sb->minor_version = 91;
1121 sb->reshape_position = mddev->reshape_position;
1122 sb->new_level = mddev->new_level;
1123 sb->delta_disks = mddev->delta_disks;
1124 sb->new_layout = mddev->new_layout;
1125 sb->new_chunk = mddev->new_chunk_sectors << 9;
1127 mddev->minor_version = sb->minor_version;
1130 sb->recovery_cp = mddev->recovery_cp;
1131 sb->cp_events_hi = (mddev->events>>32);
1132 sb->cp_events_lo = (u32)mddev->events;
1133 if (mddev->recovery_cp == MaxSector)
1134 sb->state = (1<< MD_SB_CLEAN);
1136 sb->recovery_cp = 0;
1138 sb->layout = mddev->layout;
1139 sb->chunk_size = mddev->chunk_sectors << 9;
1141 if (mddev->bitmap && mddev->bitmap_info.file == NULL)
1142 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
1144 sb->disks[0].state = (1<<MD_DISK_REMOVED);
1145 list_for_each_entry(rdev2, &mddev->disks, same_set) {
1148 int is_active = test_bit(In_sync, &rdev2->flags);
1150 if (rdev2->raid_disk >= 0 &&
1151 sb->minor_version >= 91)
1152 /* we have nowhere to store the recovery_offset,
1153 * but if it is not below the reshape_position,
1154 * we can piggy-back on that.
1157 if (rdev2->raid_disk < 0 ||
1158 test_bit(Faulty, &rdev2->flags))
1161 desc_nr = rdev2->raid_disk;
1163 desc_nr = next_spare++;
1164 rdev2->desc_nr = desc_nr;
1165 d = &sb->disks[rdev2->desc_nr];
1167 d->number = rdev2->desc_nr;
1168 d->major = MAJOR(rdev2->bdev->bd_dev);
1169 d->minor = MINOR(rdev2->bdev->bd_dev);
1171 d->raid_disk = rdev2->raid_disk;
1173 d->raid_disk = rdev2->desc_nr; /* compatibility */
1174 if (test_bit(Faulty, &rdev2->flags))
1175 d->state = (1<<MD_DISK_FAULTY);
1176 else if (is_active) {
1177 d->state = (1<<MD_DISK_ACTIVE);
1178 if (test_bit(In_sync, &rdev2->flags))
1179 d->state |= (1<<MD_DISK_SYNC);
1187 if (test_bit(WriteMostly, &rdev2->flags))
1188 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1190 /* now set the "removed" and "faulty" bits on any missing devices */
1191 for (i=0 ; i < mddev->raid_disks ; i++) {
1192 mdp_disk_t *d = &sb->disks[i];
1193 if (d->state == 0 && d->number == 0) {
1196 d->state = (1<<MD_DISK_REMOVED);
1197 d->state |= (1<<MD_DISK_FAULTY);
1201 sb->nr_disks = nr_disks;
1202 sb->active_disks = active;
1203 sb->working_disks = working;
1204 sb->failed_disks = failed;
1205 sb->spare_disks = spare;
1207 sb->this_disk = sb->disks[rdev->desc_nr];
1208 sb->sb_csum = calc_sb_csum(sb);
1212 * rdev_size_change for 0.90.0
1214 static unsigned long long
1215 super_90_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors)
1217 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1218 return 0; /* component must fit device */
1219 if (rdev->mddev->bitmap_info.offset)
1220 return 0; /* can't move bitmap */
1221 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
1222 if (!num_sectors || num_sectors > rdev->sb_start)
1223 num_sectors = rdev->sb_start;
1224 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1226 md_super_wait(rdev->mddev);
1227 return num_sectors / 2; /* kB for sysfs */
1232 * version 1 superblock
1235 static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb)
1239 unsigned long long newcsum;
1240 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1241 __le32 *isuper = (__le32*)sb;
1244 disk_csum = sb->sb_csum;
1247 for (i=0; size>=4; size -= 4 )
1248 newcsum += le32_to_cpu(*isuper++);
1251 newcsum += le16_to_cpu(*(__le16*) isuper);
1253 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1254 sb->sb_csum = disk_csum;
1255 return cpu_to_le32(csum);
1258 static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
1260 struct mdp_superblock_1 *sb;
1263 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1267 * Calculate the position of the superblock in 512byte sectors.
1268 * It is always aligned to a 4K boundary and
1269 * depeding on minor_version, it can be:
1270 * 0: At least 8K, but less than 12K, from end of device
1271 * 1: At start of device
1272 * 2: 4K from start of device.
1274 switch(minor_version) {
1276 sb_start = rdev->bdev->bd_inode->i_size >> 9;
1278 sb_start &= ~(sector_t)(4*2-1);
1289 rdev->sb_start = sb_start;
1291 /* superblock is rarely larger than 1K, but it can be larger,
1292 * and it is safe to read 4k, so we do that
1294 ret = read_disk_sb(rdev, 4096);
1295 if (ret) return ret;
1298 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1300 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1301 sb->major_version != cpu_to_le32(1) ||
1302 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1303 le64_to_cpu(sb->super_offset) != rdev->sb_start ||
1304 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1307 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1308 printk("md: invalid superblock checksum on %s\n",
1309 bdevname(rdev->bdev,b));
1312 if (le64_to_cpu(sb->data_size) < 10) {
1313 printk("md: data_size too small on %s\n",
1314 bdevname(rdev->bdev,b));
1318 rdev->preferred_minor = 0xffff;
1319 rdev->data_offset = le64_to_cpu(sb->data_offset);
1320 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1322 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1323 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1324 if (rdev->sb_size & bmask)
1325 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1328 && rdev->data_offset < sb_start + (rdev->sb_size/512))
1331 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1334 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1340 struct mdp_superblock_1 *refsb =
1341 (struct mdp_superblock_1*)page_address(refdev->sb_page);
1343 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1344 sb->level != refsb->level ||
1345 sb->layout != refsb->layout ||
1346 sb->chunksize != refsb->chunksize) {
1347 printk(KERN_WARNING "md: %s has strangely different"
1348 " superblock to %s\n",
1349 bdevname(rdev->bdev,b),
1350 bdevname(refdev->bdev,b2));
1353 ev1 = le64_to_cpu(sb->events);
1354 ev2 = le64_to_cpu(refsb->events);
1362 rdev->sectors = (rdev->bdev->bd_inode->i_size >> 9) -
1363 le64_to_cpu(sb->data_offset);
1365 rdev->sectors = rdev->sb_start;
1366 if (rdev->sectors < le64_to_cpu(sb->data_size))
1368 rdev->sectors = le64_to_cpu(sb->data_size);
1369 if (le64_to_cpu(sb->size) > rdev->sectors)
1374 static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
1376 struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1377 __u64 ev1 = le64_to_cpu(sb->events);
1379 rdev->raid_disk = -1;
1380 clear_bit(Faulty, &rdev->flags);
1381 clear_bit(In_sync, &rdev->flags);
1382 clear_bit(WriteMostly, &rdev->flags);
1383 clear_bit(BarriersNotsupp, &rdev->flags);
1385 if (mddev->raid_disks == 0) {
1386 mddev->major_version = 1;
1387 mddev->patch_version = 0;
1388 mddev->external = 0;
1389 mddev->chunk_sectors = le32_to_cpu(sb->chunksize);
1390 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1391 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1392 mddev->level = le32_to_cpu(sb->level);
1393 mddev->clevel[0] = 0;
1394 mddev->layout = le32_to_cpu(sb->layout);
1395 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1396 mddev->dev_sectors = le64_to_cpu(sb->size);
1397 mddev->events = ev1;
1398 mddev->bitmap_info.offset = 0;
1399 mddev->bitmap_info.default_offset = 1024 >> 9;
1401 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1402 memcpy(mddev->uuid, sb->set_uuid, 16);
1404 mddev->max_disks = (4096-256)/2;
1406 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1407 mddev->bitmap_info.file == NULL )
1408 mddev->bitmap_info.offset =
1409 (__s32)le32_to_cpu(sb->bitmap_offset);
1411 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1412 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1413 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1414 mddev->new_level = le32_to_cpu(sb->new_level);
1415 mddev->new_layout = le32_to_cpu(sb->new_layout);
1416 mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk);
1418 mddev->reshape_position = MaxSector;
1419 mddev->delta_disks = 0;
1420 mddev->new_level = mddev->level;
1421 mddev->new_layout = mddev->layout;
1422 mddev->new_chunk_sectors = mddev->chunk_sectors;
1425 } else if (mddev->pers == NULL) {
1426 /* Insist of good event counter while assembling */
1428 if (ev1 < mddev->events)
1430 } else if (mddev->bitmap) {
1431 /* If adding to array with a bitmap, then we can accept an
1432 * older device, but not too old.
1434 if (ev1 < mddev->bitmap->events_cleared)
1437 if (ev1 < mddev->events)
1438 /* just a hot-add of a new device, leave raid_disk at -1 */
1441 if (mddev->level != LEVEL_MULTIPATH) {
1443 if (rdev->desc_nr < 0 ||
1444 rdev->desc_nr >= le32_to_cpu(sb->max_dev)) {
1448 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1450 case 0xffff: /* spare */
1452 case 0xfffe: /* faulty */
1453 set_bit(Faulty, &rdev->flags);
1456 if ((le32_to_cpu(sb->feature_map) &
1457 MD_FEATURE_RECOVERY_OFFSET))
1458 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1460 set_bit(In_sync, &rdev->flags);
1461 rdev->raid_disk = role;
1464 if (sb->devflags & WriteMostly1)
1465 set_bit(WriteMostly, &rdev->flags);
1466 } else /* MULTIPATH are always insync */
1467 set_bit(In_sync, &rdev->flags);
1472 static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1474 struct mdp_superblock_1 *sb;
1477 /* make rdev->sb match mddev and rdev data. */
1479 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1481 sb->feature_map = 0;
1483 sb->recovery_offset = cpu_to_le64(0);
1484 memset(sb->pad1, 0, sizeof(sb->pad1));
1485 memset(sb->pad2, 0, sizeof(sb->pad2));
1486 memset(sb->pad3, 0, sizeof(sb->pad3));
1488 sb->utime = cpu_to_le64((__u64)mddev->utime);
1489 sb->events = cpu_to_le64(mddev->events);
1491 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1493 sb->resync_offset = cpu_to_le64(0);
1495 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
1497 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
1498 sb->size = cpu_to_le64(mddev->dev_sectors);
1499 sb->chunksize = cpu_to_le32(mddev->chunk_sectors);
1500 sb->level = cpu_to_le32(mddev->level);
1501 sb->layout = cpu_to_le32(mddev->layout);
1503 if (mddev->bitmap && mddev->bitmap_info.file == NULL) {
1504 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset);
1505 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
1508 if (rdev->raid_disk >= 0 &&
1509 !test_bit(In_sync, &rdev->flags)) {
1510 if (rdev->recovery_offset > 0) {
1512 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1513 sb->recovery_offset =
1514 cpu_to_le64(rdev->recovery_offset);
1518 if (mddev->reshape_position != MaxSector) {
1519 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1520 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1521 sb->new_layout = cpu_to_le32(mddev->new_layout);
1522 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1523 sb->new_level = cpu_to_le32(mddev->new_level);
1524 sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors);
1528 list_for_each_entry(rdev2, &mddev->disks, same_set)
1529 if (rdev2->desc_nr+1 > max_dev)
1530 max_dev = rdev2->desc_nr+1;
1532 if (max_dev > le32_to_cpu(sb->max_dev)) {
1534 sb->max_dev = cpu_to_le32(max_dev);
1535 rdev->sb_size = max_dev * 2 + 256;
1536 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1537 if (rdev->sb_size & bmask)
1538 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1540 for (i=0; i<max_dev;i++)
1541 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1543 list_for_each_entry(rdev2, &mddev->disks, same_set) {
1545 if (test_bit(Faulty, &rdev2->flags))
1546 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1547 else if (test_bit(In_sync, &rdev2->flags))
1548 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1549 else if (rdev2->raid_disk >= 0 && rdev2->recovery_offset > 0)
1550 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1552 sb->dev_roles[i] = cpu_to_le16(0xffff);
1555 sb->sb_csum = calc_sb_1_csum(sb);
1558 static unsigned long long
1559 super_1_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors)
1561 struct mdp_superblock_1 *sb;
1562 sector_t max_sectors;
1563 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1564 return 0; /* component must fit device */
1565 if (rdev->sb_start < rdev->data_offset) {
1566 /* minor versions 1 and 2; superblock before data */
1567 max_sectors = rdev->bdev->bd_inode->i_size >> 9;
1568 max_sectors -= rdev->data_offset;
1569 if (!num_sectors || num_sectors > max_sectors)
1570 num_sectors = max_sectors;
1571 } else if (rdev->mddev->bitmap_info.offset) {
1572 /* minor version 0 with bitmap we can't move */
1575 /* minor version 0; superblock after data */
1577 sb_start = (rdev->bdev->bd_inode->i_size >> 9) - 8*2;
1578 sb_start &= ~(sector_t)(4*2 - 1);
1579 max_sectors = rdev->sectors + sb_start - rdev->sb_start;
1580 if (!num_sectors || num_sectors > max_sectors)
1581 num_sectors = max_sectors;
1582 rdev->sb_start = sb_start;
1584 sb = (struct mdp_superblock_1 *) page_address(rdev->sb_page);
1585 sb->data_size = cpu_to_le64(num_sectors);
1586 sb->super_offset = rdev->sb_start;
1587 sb->sb_csum = calc_sb_1_csum(sb);
1588 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1590 md_super_wait(rdev->mddev);
1591 return num_sectors / 2; /* kB for sysfs */
1594 static struct super_type super_types[] = {
1597 .owner = THIS_MODULE,
1598 .load_super = super_90_load,
1599 .validate_super = super_90_validate,
1600 .sync_super = super_90_sync,
1601 .rdev_size_change = super_90_rdev_size_change,
1605 .owner = THIS_MODULE,
1606 .load_super = super_1_load,
1607 .validate_super = super_1_validate,
1608 .sync_super = super_1_sync,
1609 .rdev_size_change = super_1_rdev_size_change,
1613 static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)
1615 mdk_rdev_t *rdev, *rdev2;
1618 rdev_for_each_rcu(rdev, mddev1)
1619 rdev_for_each_rcu(rdev2, mddev2)
1620 if (rdev->bdev->bd_contains ==
1621 rdev2->bdev->bd_contains) {
1629 static LIST_HEAD(pending_raid_disks);
1632 * Try to register data integrity profile for an mddev
1634 * This is called when an array is started and after a disk has been kicked
1635 * from the array. It only succeeds if all working and active component devices
1636 * are integrity capable with matching profiles.
1638 int md_integrity_register(mddev_t *mddev)
1640 mdk_rdev_t *rdev, *reference = NULL;
1642 if (list_empty(&mddev->disks))
1643 return 0; /* nothing to do */
1644 if (blk_get_integrity(mddev->gendisk))
1645 return 0; /* already registered */
1646 list_for_each_entry(rdev, &mddev->disks, same_set) {
1647 /* skip spares and non-functional disks */
1648 if (test_bit(Faulty, &rdev->flags))
1650 if (rdev->raid_disk < 0)
1653 * If at least one rdev is not integrity capable, we can not
1654 * enable data integrity for the md device.
1656 if (!bdev_get_integrity(rdev->bdev))
1659 /* Use the first rdev as the reference */
1663 /* does this rdev's profile match the reference profile? */
1664 if (blk_integrity_compare(reference->bdev->bd_disk,
1665 rdev->bdev->bd_disk) < 0)
1669 * All component devices are integrity capable and have matching
1670 * profiles, register the common profile for the md device.
1672 if (blk_integrity_register(mddev->gendisk,
1673 bdev_get_integrity(reference->bdev)) != 0) {
1674 printk(KERN_ERR "md: failed to register integrity for %s\n",
1678 printk(KERN_NOTICE "md: data integrity on %s enabled\n",
1682 EXPORT_SYMBOL(md_integrity_register);
1684 /* Disable data integrity if non-capable/non-matching disk is being added */
1685 void md_integrity_add_rdev(mdk_rdev_t *rdev, mddev_t *mddev)
1687 struct blk_integrity *bi_rdev = bdev_get_integrity(rdev->bdev);
1688 struct blk_integrity *bi_mddev = blk_get_integrity(mddev->gendisk);
1690 if (!bi_mddev) /* nothing to do */
1692 if (rdev->raid_disk < 0) /* skip spares */
1694 if (bi_rdev && blk_integrity_compare(mddev->gendisk,
1695 rdev->bdev->bd_disk) >= 0)
1697 printk(KERN_NOTICE "disabling data integrity on %s\n", mdname(mddev));
1698 blk_integrity_unregister(mddev->gendisk);
1700 EXPORT_SYMBOL(md_integrity_add_rdev);
1702 static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
1704 char b[BDEVNAME_SIZE];
1714 /* prevent duplicates */
1715 if (find_rdev(mddev, rdev->bdev->bd_dev))
1718 /* make sure rdev->sectors exceeds mddev->dev_sectors */
1719 if (rdev->sectors && (mddev->dev_sectors == 0 ||
1720 rdev->sectors < mddev->dev_sectors)) {
1722 /* Cannot change size, so fail
1723 * If mddev->level <= 0, then we don't care
1724 * about aligning sizes (e.g. linear)
1726 if (mddev->level > 0)
1729 mddev->dev_sectors = rdev->sectors;
1732 /* Verify rdev->desc_nr is unique.
1733 * If it is -1, assign a free number, else
1734 * check number is not in use
1736 if (rdev->desc_nr < 0) {
1738 if (mddev->pers) choice = mddev->raid_disks;
1739 while (find_rdev_nr(mddev, choice))
1741 rdev->desc_nr = choice;
1743 if (find_rdev_nr(mddev, rdev->desc_nr))
1746 if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) {
1747 printk(KERN_WARNING "md: %s: array is limited to %d devices\n",
1748 mdname(mddev), mddev->max_disks);
1751 bdevname(rdev->bdev,b);
1752 while ( (s=strchr(b, '/')) != NULL)
1755 rdev->mddev = mddev;
1756 printk(KERN_INFO "md: bind<%s>\n", b);
1758 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
1761 ko = &part_to_dev(rdev->bdev->bd_part)->kobj;
1762 if ((err = sysfs_create_link(&rdev->kobj, ko, "block"))) {
1763 kobject_del(&rdev->kobj);
1766 rdev->sysfs_state = sysfs_get_dirent(rdev->kobj.sd, "state");
1768 list_add_rcu(&rdev->same_set, &mddev->disks);
1769 bd_claim_by_disk(rdev->bdev, rdev->bdev->bd_holder, mddev->gendisk);
1771 /* May as well allow recovery to be retried once */
1772 mddev->recovery_disabled = 0;
1777 printk(KERN_WARNING "md: failed to register dev-%s for %s\n",
1782 static void md_delayed_delete(struct work_struct *ws)
1784 mdk_rdev_t *rdev = container_of(ws, mdk_rdev_t, del_work);
1785 kobject_del(&rdev->kobj);
1786 kobject_put(&rdev->kobj);
1789 static void unbind_rdev_from_array(mdk_rdev_t * rdev)
1791 char b[BDEVNAME_SIZE];
1796 bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk);
1797 list_del_rcu(&rdev->same_set);
1798 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
1800 sysfs_remove_link(&rdev->kobj, "block");
1801 sysfs_put(rdev->sysfs_state);
1802 rdev->sysfs_state = NULL;
1803 /* We need to delay this, otherwise we can deadlock when
1804 * writing to 'remove' to "dev/state". We also need
1805 * to delay it due to rcu usage.
1808 INIT_WORK(&rdev->del_work, md_delayed_delete);
1809 kobject_get(&rdev->kobj);
1810 schedule_work(&rdev->del_work);
1814 * prevent the device from being mounted, repartitioned or
1815 * otherwise reused by a RAID array (or any other kernel
1816 * subsystem), by bd_claiming the device.
1818 static int lock_rdev(mdk_rdev_t *rdev, dev_t dev, int shared)
1821 struct block_device *bdev;
1822 char b[BDEVNAME_SIZE];
1824 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
1826 printk(KERN_ERR "md: could not open %s.\n",
1827 __bdevname(dev, b));
1828 return PTR_ERR(bdev);
1830 err = bd_claim(bdev, shared ? (mdk_rdev_t *)lock_rdev : rdev);
1832 printk(KERN_ERR "md: could not bd_claim %s.\n",
1834 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
1838 set_bit(AllReserved, &rdev->flags);
1843 static void unlock_rdev(mdk_rdev_t *rdev)
1845 struct block_device *bdev = rdev->bdev;
1850 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
1853 void md_autodetect_dev(dev_t dev);
1855 static void export_rdev(mdk_rdev_t * rdev)
1857 char b[BDEVNAME_SIZE];
1858 printk(KERN_INFO "md: export_rdev(%s)\n",
1859 bdevname(rdev->bdev,b));
1864 if (test_bit(AutoDetected, &rdev->flags))
1865 md_autodetect_dev(rdev->bdev->bd_dev);
1868 kobject_put(&rdev->kobj);
1871 static void kick_rdev_from_array(mdk_rdev_t * rdev)
1873 unbind_rdev_from_array(rdev);
1877 static void export_array(mddev_t *mddev)
1879 mdk_rdev_t *rdev, *tmp;
1881 rdev_for_each(rdev, tmp, mddev) {
1886 kick_rdev_from_array(rdev);
1888 if (!list_empty(&mddev->disks))
1890 mddev->raid_disks = 0;
1891 mddev->major_version = 0;
1894 static void print_desc(mdp_disk_t *desc)
1896 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
1897 desc->major,desc->minor,desc->raid_disk,desc->state);
1900 static void print_sb_90(mdp_super_t *sb)
1905 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1906 sb->major_version, sb->minor_version, sb->patch_version,
1907 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
1909 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1910 sb->level, sb->size, sb->nr_disks, sb->raid_disks,
1911 sb->md_minor, sb->layout, sb->chunk_size);
1912 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
1913 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1914 sb->utime, sb->state, sb->active_disks, sb->working_disks,
1915 sb->failed_disks, sb->spare_disks,
1916 sb->sb_csum, (unsigned long)sb->events_lo);
1919 for (i = 0; i < MD_SB_DISKS; i++) {
1922 desc = sb->disks + i;
1923 if (desc->number || desc->major || desc->minor ||
1924 desc->raid_disk || (desc->state && (desc->state != 4))) {
1925 printk(" D %2d: ", i);
1929 printk(KERN_INFO "md: THIS: ");
1930 print_desc(&sb->this_disk);
1933 static void print_sb_1(struct mdp_superblock_1 *sb)
1937 uuid = sb->set_uuid;
1939 "md: SB: (V:%u) (F:0x%08x) Array-ID:<%02x%02x%02x%02x"
1940 ":%02x%02x:%02x%02x:%02x%02x:%02x%02x%02x%02x%02x%02x>\n"
1941 "md: Name: \"%s\" CT:%llu\n",
1942 le32_to_cpu(sb->major_version),
1943 le32_to_cpu(sb->feature_map),
1944 uuid[0], uuid[1], uuid[2], uuid[3],
1945 uuid[4], uuid[5], uuid[6], uuid[7],
1946 uuid[8], uuid[9], uuid[10], uuid[11],
1947 uuid[12], uuid[13], uuid[14], uuid[15],
1949 (unsigned long long)le64_to_cpu(sb->ctime)
1950 & MD_SUPERBLOCK_1_TIME_SEC_MASK);
1952 uuid = sb->device_uuid;
1954 "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu"
1956 "md: Dev:%08x UUID: %02x%02x%02x%02x:%02x%02x:%02x%02x:%02x%02x"
1957 ":%02x%02x%02x%02x%02x%02x\n"
1958 "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n"
1959 "md: (MaxDev:%u) \n",
1960 le32_to_cpu(sb->level),
1961 (unsigned long long)le64_to_cpu(sb->size),
1962 le32_to_cpu(sb->raid_disks),
1963 le32_to_cpu(sb->layout),
1964 le32_to_cpu(sb->chunksize),
1965 (unsigned long long)le64_to_cpu(sb->data_offset),
1966 (unsigned long long)le64_to_cpu(sb->data_size),
1967 (unsigned long long)le64_to_cpu(sb->super_offset),
1968 (unsigned long long)le64_to_cpu(sb->recovery_offset),
1969 le32_to_cpu(sb->dev_number),
1970 uuid[0], uuid[1], uuid[2], uuid[3],
1971 uuid[4], uuid[5], uuid[6], uuid[7],
1972 uuid[8], uuid[9], uuid[10], uuid[11],
1973 uuid[12], uuid[13], uuid[14], uuid[15],
1975 (unsigned long long)le64_to_cpu(sb->utime) & MD_SUPERBLOCK_1_TIME_SEC_MASK,
1976 (unsigned long long)le64_to_cpu(sb->events),
1977 (unsigned long long)le64_to_cpu(sb->resync_offset),
1978 le32_to_cpu(sb->sb_csum),
1979 le32_to_cpu(sb->max_dev)
1983 static void print_rdev(mdk_rdev_t *rdev, int major_version)
1985 char b[BDEVNAME_SIZE];
1986 printk(KERN_INFO "md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n",
1987 bdevname(rdev->bdev, b), (unsigned long long)rdev->sectors,
1988 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
1990 if (rdev->sb_loaded) {
1991 printk(KERN_INFO "md: rdev superblock (MJ:%d):\n", major_version);
1992 switch (major_version) {
1994 print_sb_90((mdp_super_t*)page_address(rdev->sb_page));
1997 print_sb_1((struct mdp_superblock_1 *)page_address(rdev->sb_page));
2001 printk(KERN_INFO "md: no rdev superblock!\n");
2004 static void md_print_devices(void)
2006 struct list_head *tmp;
2009 char b[BDEVNAME_SIZE];
2012 printk("md: **********************************\n");
2013 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
2014 printk("md: **********************************\n");
2015 for_each_mddev(mddev, tmp) {
2018 bitmap_print_sb(mddev->bitmap);
2020 printk("%s: ", mdname(mddev));
2021 list_for_each_entry(rdev, &mddev->disks, same_set)
2022 printk("<%s>", bdevname(rdev->bdev,b));
2025 list_for_each_entry(rdev, &mddev->disks, same_set)
2026 print_rdev(rdev, mddev->major_version);
2028 printk("md: **********************************\n");
2033 static void sync_sbs(mddev_t * mddev, int nospares)
2035 /* Update each superblock (in-memory image), but
2036 * if we are allowed to, skip spares which already
2037 * have the right event counter, or have one earlier
2038 * (which would mean they aren't being marked as dirty
2039 * with the rest of the array)
2043 /* First make sure individual recovery_offsets are correct */
2044 list_for_each_entry(rdev, &mddev->disks, same_set) {
2045 if (rdev->raid_disk >= 0 &&
2046 !test_bit(In_sync, &rdev->flags) &&
2047 mddev->curr_resync_completed > rdev->recovery_offset)
2048 rdev->recovery_offset = mddev->curr_resync_completed;
2051 list_for_each_entry(rdev, &mddev->disks, same_set) {
2052 if (rdev->sb_events == mddev->events ||
2054 rdev->raid_disk < 0 &&
2055 (rdev->sb_events&1)==0 &&
2056 rdev->sb_events+1 == mddev->events)) {
2057 /* Don't update this superblock */
2058 rdev->sb_loaded = 2;
2060 super_types[mddev->major_version].
2061 sync_super(mddev, rdev);
2062 rdev->sb_loaded = 1;
2067 static void md_update_sb(mddev_t * mddev, int force_change)
2073 mddev->utime = get_seconds();
2074 if (mddev->external)
2077 spin_lock_irq(&mddev->write_lock);
2079 set_bit(MD_CHANGE_PENDING, &mddev->flags);
2080 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
2082 if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags))
2083 /* just a clean<-> dirty transition, possibly leave spares alone,
2084 * though if events isn't the right even/odd, we will have to do
2090 if (mddev->degraded)
2091 /* If the array is degraded, then skipping spares is both
2092 * dangerous and fairly pointless.
2093 * Dangerous because a device that was removed from the array
2094 * might have a event_count that still looks up-to-date,
2095 * so it can be re-added without a resync.
2096 * Pointless because if there are any spares to skip,
2097 * then a recovery will happen and soon that array won't
2098 * be degraded any more and the spare can go back to sleep then.
2102 sync_req = mddev->in_sync;
2104 /* If this is just a dirty<->clean transition, and the array is clean
2105 * and 'events' is odd, we can roll back to the previous clean state */
2107 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
2108 && (mddev->events & 1)
2109 && mddev->events != 1)
2112 /* otherwise we have to go forward and ... */
2114 if (!mddev->in_sync || mddev->recovery_cp != MaxSector) { /* not clean */
2115 /* .. if the array isn't clean, an 'even' event must also go
2117 if ((mddev->events&1)==0)
2120 /* otherwise an 'odd' event must go to spares */
2121 if ((mddev->events&1))
2126 if (!mddev->events) {
2128 * oops, this 64-bit counter should never wrap.
2129 * Either we are in around ~1 trillion A.C., assuming
2130 * 1 reboot per second, or we have a bug:
2137 * do not write anything to disk if using
2138 * nonpersistent superblocks
2140 if (!mddev->persistent) {
2141 if (!mddev->external)
2142 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2144 spin_unlock_irq(&mddev->write_lock);
2145 wake_up(&mddev->sb_wait);
2148 sync_sbs(mddev, nospares);
2149 spin_unlock_irq(&mddev->write_lock);
2152 "md: updating %s RAID superblock on device (in sync %d)\n",
2153 mdname(mddev),mddev->in_sync);
2155 bitmap_update_sb(mddev->bitmap);
2156 list_for_each_entry(rdev, &mddev->disks, same_set) {
2157 char b[BDEVNAME_SIZE];
2158 dprintk(KERN_INFO "md: ");
2159 if (rdev->sb_loaded != 1)
2160 continue; /* no noise on spare devices */
2161 if (test_bit(Faulty, &rdev->flags))
2162 dprintk("(skipping faulty ");
2164 dprintk("%s ", bdevname(rdev->bdev,b));
2165 if (!test_bit(Faulty, &rdev->flags)) {
2166 md_super_write(mddev,rdev,
2167 rdev->sb_start, rdev->sb_size,
2169 dprintk(KERN_INFO "(write) %s's sb offset: %llu\n",
2170 bdevname(rdev->bdev,b),
2171 (unsigned long long)rdev->sb_start);
2172 rdev->sb_events = mddev->events;
2176 if (mddev->level == LEVEL_MULTIPATH)
2177 /* only need to write one superblock... */
2180 md_super_wait(mddev);
2181 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2183 spin_lock_irq(&mddev->write_lock);
2184 if (mddev->in_sync != sync_req ||
2185 test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
2186 /* have to write it out again */
2187 spin_unlock_irq(&mddev->write_lock);
2190 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2191 spin_unlock_irq(&mddev->write_lock);
2192 wake_up(&mddev->sb_wait);
2193 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
2194 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
2198 /* words written to sysfs files may, or may not, be \n terminated.
2199 * We want to accept with case. For this we use cmd_match.
2201 static int cmd_match(const char *cmd, const char *str)
2203 /* See if cmd, written into a sysfs file, matches
2204 * str. They must either be the same, or cmd can
2205 * have a trailing newline
2207 while (*cmd && *str && *cmd == *str) {
2218 struct rdev_sysfs_entry {
2219 struct attribute attr;
2220 ssize_t (*show)(mdk_rdev_t *, char *);
2221 ssize_t (*store)(mdk_rdev_t *, const char *, size_t);
2225 state_show(mdk_rdev_t *rdev, char *page)
2230 if (test_bit(Faulty, &rdev->flags)) {
2231 len+= sprintf(page+len, "%sfaulty",sep);
2234 if (test_bit(In_sync, &rdev->flags)) {
2235 len += sprintf(page+len, "%sin_sync",sep);
2238 if (test_bit(WriteMostly, &rdev->flags)) {
2239 len += sprintf(page+len, "%swrite_mostly",sep);
2242 if (test_bit(Blocked, &rdev->flags)) {
2243 len += sprintf(page+len, "%sblocked", sep);
2246 if (!test_bit(Faulty, &rdev->flags) &&
2247 !test_bit(In_sync, &rdev->flags)) {
2248 len += sprintf(page+len, "%sspare", sep);
2251 return len+sprintf(page+len, "\n");
2255 state_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2258 * faulty - simulates and error
2259 * remove - disconnects the device
2260 * writemostly - sets write_mostly
2261 * -writemostly - clears write_mostly
2262 * blocked - sets the Blocked flag
2263 * -blocked - clears the Blocked flag
2264 * insync - sets Insync providing device isn't active
2267 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
2268 md_error(rdev->mddev, rdev);
2270 } else if (cmd_match(buf, "remove")) {
2271 if (rdev->raid_disk >= 0)
2274 mddev_t *mddev = rdev->mddev;
2275 kick_rdev_from_array(rdev);
2277 md_update_sb(mddev, 1);
2278 md_new_event(mddev);
2281 } else if (cmd_match(buf, "writemostly")) {
2282 set_bit(WriteMostly, &rdev->flags);
2284 } else if (cmd_match(buf, "-writemostly")) {
2285 clear_bit(WriteMostly, &rdev->flags);
2287 } else if (cmd_match(buf, "blocked")) {
2288 set_bit(Blocked, &rdev->flags);
2290 } else if (cmd_match(buf, "-blocked")) {
2291 clear_bit(Blocked, &rdev->flags);
2292 wake_up(&rdev->blocked_wait);
2293 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2294 md_wakeup_thread(rdev->mddev->thread);
2297 } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) {
2298 set_bit(In_sync, &rdev->flags);
2301 if (!err && rdev->sysfs_state)
2302 sysfs_notify_dirent(rdev->sysfs_state);
2303 return err ? err : len;
2305 static struct rdev_sysfs_entry rdev_state =
2306 __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store);
2309 errors_show(mdk_rdev_t *rdev, char *page)
2311 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
2315 errors_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2318 unsigned long n = simple_strtoul(buf, &e, 10);
2319 if (*buf && (*e == 0 || *e == '\n')) {
2320 atomic_set(&rdev->corrected_errors, n);
2325 static struct rdev_sysfs_entry rdev_errors =
2326 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
2329 slot_show(mdk_rdev_t *rdev, char *page)
2331 if (rdev->raid_disk < 0)
2332 return sprintf(page, "none\n");
2334 return sprintf(page, "%d\n", rdev->raid_disk);
2338 slot_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2343 int slot = simple_strtoul(buf, &e, 10);
2344 if (strncmp(buf, "none", 4)==0)
2346 else if (e==buf || (*e && *e!= '\n'))
2348 if (rdev->mddev->pers && slot == -1) {
2349 /* Setting 'slot' on an active array requires also
2350 * updating the 'rd%d' link, and communicating
2351 * with the personality with ->hot_*_disk.
2352 * For now we only support removing
2353 * failed/spare devices. This normally happens automatically,
2354 * but not when the metadata is externally managed.
2356 if (rdev->raid_disk == -1)
2358 /* personality does all needed checks */
2359 if (rdev->mddev->pers->hot_add_disk == NULL)
2361 err = rdev->mddev->pers->
2362 hot_remove_disk(rdev->mddev, rdev->raid_disk);
2365 sprintf(nm, "rd%d", rdev->raid_disk);
2366 sysfs_remove_link(&rdev->mddev->kobj, nm);
2367 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2368 md_wakeup_thread(rdev->mddev->thread);
2369 } else if (rdev->mddev->pers) {
2371 /* Activating a spare .. or possibly reactivating
2372 * if we ever get bitmaps working here.
2375 if (rdev->raid_disk != -1)
2378 if (rdev->mddev->pers->hot_add_disk == NULL)
2381 list_for_each_entry(rdev2, &rdev->mddev->disks, same_set)
2382 if (rdev2->raid_disk == slot)
2385 rdev->raid_disk = slot;
2386 if (test_bit(In_sync, &rdev->flags))
2387 rdev->saved_raid_disk = slot;
2389 rdev->saved_raid_disk = -1;
2390 err = rdev->mddev->pers->
2391 hot_add_disk(rdev->mddev, rdev);
2393 rdev->raid_disk = -1;
2396 sysfs_notify_dirent(rdev->sysfs_state);
2397 sprintf(nm, "rd%d", rdev->raid_disk);
2398 if (sysfs_create_link(&rdev->mddev->kobj, &rdev->kobj, nm))
2400 "md: cannot register "
2402 nm, mdname(rdev->mddev));
2404 /* don't wakeup anyone, leave that to userspace. */
2406 if (slot >= rdev->mddev->raid_disks)
2408 rdev->raid_disk = slot;
2409 /* assume it is working */
2410 clear_bit(Faulty, &rdev->flags);
2411 clear_bit(WriteMostly, &rdev->flags);
2412 set_bit(In_sync, &rdev->flags);
2413 sysfs_notify_dirent(rdev->sysfs_state);
2419 static struct rdev_sysfs_entry rdev_slot =
2420 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
2423 offset_show(mdk_rdev_t *rdev, char *page)
2425 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
2429 offset_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2432 unsigned long long offset = simple_strtoull(buf, &e, 10);
2433 if (e==buf || (*e && *e != '\n'))
2435 if (rdev->mddev->pers && rdev->raid_disk >= 0)
2437 if (rdev->sectors && rdev->mddev->external)
2438 /* Must set offset before size, so overlap checks
2441 rdev->data_offset = offset;
2445 static struct rdev_sysfs_entry rdev_offset =
2446 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
2449 rdev_size_show(mdk_rdev_t *rdev, char *page)
2451 return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2);
2454 static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
2456 /* check if two start/length pairs overlap */
2464 static int strict_blocks_to_sectors(const char *buf, sector_t *sectors)
2466 unsigned long long blocks;
2469 if (strict_strtoull(buf, 10, &blocks) < 0)
2472 if (blocks & 1ULL << (8 * sizeof(blocks) - 1))
2473 return -EINVAL; /* sector conversion overflow */
2476 if (new != blocks * 2)
2477 return -EINVAL; /* unsigned long long to sector_t overflow */
2484 rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2486 mddev_t *my_mddev = rdev->mddev;
2487 sector_t oldsectors = rdev->sectors;
2490 if (strict_blocks_to_sectors(buf, §ors) < 0)
2492 if (my_mddev->pers && rdev->raid_disk >= 0) {
2493 if (my_mddev->persistent) {
2494 sectors = super_types[my_mddev->major_version].
2495 rdev_size_change(rdev, sectors);
2498 } else if (!sectors)
2499 sectors = (rdev->bdev->bd_inode->i_size >> 9) -
2502 if (sectors < my_mddev->dev_sectors)
2503 return -EINVAL; /* component must fit device */
2505 rdev->sectors = sectors;
2506 if (sectors > oldsectors && my_mddev->external) {
2507 /* need to check that all other rdevs with the same ->bdev
2508 * do not overlap. We need to unlock the mddev to avoid
2509 * a deadlock. We have already changed rdev->sectors, and if
2510 * we have to change it back, we will have the lock again.
2514 struct list_head *tmp;
2516 mddev_unlock(my_mddev);
2517 for_each_mddev(mddev, tmp) {
2521 list_for_each_entry(rdev2, &mddev->disks, same_set)
2522 if (test_bit(AllReserved, &rdev2->flags) ||
2523 (rdev->bdev == rdev2->bdev &&
2525 overlaps(rdev->data_offset, rdev->sectors,
2531 mddev_unlock(mddev);
2537 mddev_lock(my_mddev);
2539 /* Someone else could have slipped in a size
2540 * change here, but doing so is just silly.
2541 * We put oldsectors back because we *know* it is
2542 * safe, and trust userspace not to race with
2545 rdev->sectors = oldsectors;
2552 static struct rdev_sysfs_entry rdev_size =
2553 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
2555 static struct attribute *rdev_default_attrs[] = {
2564 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
2566 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2567 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
2568 mddev_t *mddev = rdev->mddev;
2574 rv = mddev ? mddev_lock(mddev) : -EBUSY;
2576 if (rdev->mddev == NULL)
2579 rv = entry->show(rdev, page);
2580 mddev_unlock(mddev);
2586 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
2587 const char *page, size_t length)
2589 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2590 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
2592 mddev_t *mddev = rdev->mddev;
2596 if (!capable(CAP_SYS_ADMIN))
2598 rv = mddev ? mddev_lock(mddev): -EBUSY;
2600 if (rdev->mddev == NULL)
2603 rv = entry->store(rdev, page, length);
2604 mddev_unlock(mddev);
2609 static void rdev_free(struct kobject *ko)
2611 mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj);
2614 static struct sysfs_ops rdev_sysfs_ops = {
2615 .show = rdev_attr_show,
2616 .store = rdev_attr_store,
2618 static struct kobj_type rdev_ktype = {
2619 .release = rdev_free,
2620 .sysfs_ops = &rdev_sysfs_ops,
2621 .default_attrs = rdev_default_attrs,
2625 * Import a device. If 'super_format' >= 0, then sanity check the superblock
2627 * mark the device faulty if:
2629 * - the device is nonexistent (zero size)
2630 * - the device has no valid superblock
2632 * a faulty rdev _never_ has rdev->sb set.
2634 static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor)
2636 char b[BDEVNAME_SIZE];
2641 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
2643 printk(KERN_ERR "md: could not alloc mem for new device!\n");
2644 return ERR_PTR(-ENOMEM);
2647 if ((err = alloc_disk_sb(rdev)))
2650 err = lock_rdev(rdev, newdev, super_format == -2);
2654 kobject_init(&rdev->kobj, &rdev_ktype);
2657 rdev->saved_raid_disk = -1;
2658 rdev->raid_disk = -1;
2660 rdev->data_offset = 0;
2661 rdev->sb_events = 0;
2662 rdev->last_read_error.tv_sec = 0;
2663 rdev->last_read_error.tv_nsec = 0;
2664 atomic_set(&rdev->nr_pending, 0);
2665 atomic_set(&rdev->read_errors, 0);
2666 atomic_set(&rdev->corrected_errors, 0);
2668 size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
2671 "md: %s has zero or unknown size, marking faulty!\n",
2672 bdevname(rdev->bdev,b));
2677 if (super_format >= 0) {
2678 err = super_types[super_format].
2679 load_super(rdev, NULL, super_minor);
2680 if (err == -EINVAL) {
2682 "md: %s does not have a valid v%d.%d "
2683 "superblock, not importing!\n",
2684 bdevname(rdev->bdev,b),
2685 super_format, super_minor);
2690 "md: could not read %s's sb, not importing!\n",
2691 bdevname(rdev->bdev,b));
2696 INIT_LIST_HEAD(&rdev->same_set);
2697 init_waitqueue_head(&rdev->blocked_wait);
2702 if (rdev->sb_page) {
2708 return ERR_PTR(err);
2712 * Check a full RAID array for plausibility
2716 static void analyze_sbs(mddev_t * mddev)
2719 mdk_rdev_t *rdev, *freshest, *tmp;
2720 char b[BDEVNAME_SIZE];
2723 rdev_for_each(rdev, tmp, mddev)
2724 switch (super_types[mddev->major_version].
2725 load_super(rdev, freshest, mddev->minor_version)) {
2733 "md: fatal superblock inconsistency in %s"
2734 " -- removing from array\n",
2735 bdevname(rdev->bdev,b));
2736 kick_rdev_from_array(rdev);
2740 super_types[mddev->major_version].
2741 validate_super(mddev, freshest);
2744 rdev_for_each(rdev, tmp, mddev) {
2745 if (rdev->desc_nr >= mddev->max_disks ||
2746 i > mddev->max_disks) {
2748 "md: %s: %s: only %d devices permitted\n",
2749 mdname(mddev), bdevname(rdev->bdev, b),
2751 kick_rdev_from_array(rdev);
2754 if (rdev != freshest)
2755 if (super_types[mddev->major_version].
2756 validate_super(mddev, rdev)) {
2757 printk(KERN_WARNING "md: kicking non-fresh %s"
2759 bdevname(rdev->bdev,b));
2760 kick_rdev_from_array(rdev);
2763 if (mddev->level == LEVEL_MULTIPATH) {
2764 rdev->desc_nr = i++;
2765 rdev->raid_disk = rdev->desc_nr;
2766 set_bit(In_sync, &rdev->flags);
2767 } else if (rdev->raid_disk >= (mddev->raid_disks - min(0, mddev->delta_disks))) {
2768 rdev->raid_disk = -1;
2769 clear_bit(In_sync, &rdev->flags);
2774 /* Read a fixed-point number.
2775 * Numbers in sysfs attributes should be in "standard" units where
2776 * possible, so time should be in seconds.
2777 * However we internally use a a much smaller unit such as
2778 * milliseconds or jiffies.
2779 * This function takes a decimal number with a possible fractional
2780 * component, and produces an integer which is the result of
2781 * multiplying that number by 10^'scale'.
2782 * all without any floating-point arithmetic.
2784 int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale)
2786 unsigned long result = 0;
2788 while (isdigit(*cp) || (*cp == '.' && decimals < 0)) {
2791 else if (decimals < scale) {
2794 result = result * 10 + value;
2806 while (decimals < scale) {
2815 static void md_safemode_timeout(unsigned long data);
2818 safe_delay_show(mddev_t *mddev, char *page)
2820 int msec = (mddev->safemode_delay*1000)/HZ;
2821 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
2824 safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len)
2828 if (strict_strtoul_scaled(cbuf, &msec, 3) < 0)
2831 mddev->safemode_delay = 0;
2833 unsigned long old_delay = mddev->safemode_delay;
2834 mddev->safemode_delay = (msec*HZ)/1000;
2835 if (mddev->safemode_delay == 0)
2836 mddev->safemode_delay = 1;
2837 if (mddev->safemode_delay < old_delay)
2838 md_safemode_timeout((unsigned long)mddev);
2842 static struct md_sysfs_entry md_safe_delay =
2843 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
2846 level_show(mddev_t *mddev, char *page)
2848 struct mdk_personality *p = mddev->pers;
2850 return sprintf(page, "%s\n", p->name);
2851 else if (mddev->clevel[0])
2852 return sprintf(page, "%s\n", mddev->clevel);
2853 else if (mddev->level != LEVEL_NONE)
2854 return sprintf(page, "%d\n", mddev->level);
2860 level_store(mddev_t *mddev, const char *buf, size_t len)
2864 struct mdk_personality *pers;
2868 if (mddev->pers == NULL) {
2871 if (len >= sizeof(mddev->clevel))
2873 strncpy(mddev->clevel, buf, len);
2874 if (mddev->clevel[len-1] == '\n')
2876 mddev->clevel[len] = 0;
2877 mddev->level = LEVEL_NONE;
2881 /* request to change the personality. Need to ensure:
2882 * - array is not engaged in resync/recovery/reshape
2883 * - old personality can be suspended
2884 * - new personality will access other array.
2887 if (mddev->sync_thread || mddev->reshape_position != MaxSector)
2890 if (!mddev->pers->quiesce) {
2891 printk(KERN_WARNING "md: %s: %s does not support online personality change\n",
2892 mdname(mddev), mddev->pers->name);
2896 /* Now find the new personality */
2897 if (len == 0 || len >= sizeof(level))
2899 strncpy(level, buf, len);
2900 if (level[len-1] == '\n')
2904 request_module("md-%s", level);
2905 spin_lock(&pers_lock);
2906 pers = find_pers(LEVEL_NONE, level);
2907 if (!pers || !try_module_get(pers->owner)) {
2908 spin_unlock(&pers_lock);
2909 printk(KERN_WARNING "md: personality %s not loaded\n", level);
2912 spin_unlock(&pers_lock);
2914 if (pers == mddev->pers) {
2915 /* Nothing to do! */
2916 module_put(pers->owner);
2919 if (!pers->takeover) {
2920 module_put(pers->owner);
2921 printk(KERN_WARNING "md: %s: %s does not support personality takeover\n",
2922 mdname(mddev), level);
2926 /* ->takeover must set new_* and/or delta_disks
2927 * if it succeeds, and may set them when it fails.
2929 priv = pers->takeover(mddev);
2931 mddev->new_level = mddev->level;
2932 mddev->new_layout = mddev->layout;
2933 mddev->new_chunk_sectors = mddev->chunk_sectors;
2934 mddev->raid_disks -= mddev->delta_disks;
2935 mddev->delta_disks = 0;
2936 module_put(pers->owner);
2937 printk(KERN_WARNING "md: %s: %s would not accept array\n",
2938 mdname(mddev), level);
2939 return PTR_ERR(priv);
2942 /* Looks like we have a winner */
2943 mddev_suspend(mddev);
2944 mddev->pers->stop(mddev);
2945 module_put(mddev->pers->owner);
2946 /* Invalidate devices that are now superfluous */
2947 list_for_each_entry(rdev, &mddev->disks, same_set)
2948 if (rdev->raid_disk >= mddev->raid_disks) {
2949 rdev->raid_disk = -1;
2950 clear_bit(In_sync, &rdev->flags);
2953 mddev->private = priv;
2954 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
2955 mddev->level = mddev->new_level;
2956 mddev->layout = mddev->new_layout;
2957 mddev->chunk_sectors = mddev->new_chunk_sectors;
2958 mddev->delta_disks = 0;
2960 mddev_resume(mddev);
2961 set_bit(MD_CHANGE_DEVS, &mddev->flags);
2962 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2963 md_wakeup_thread(mddev->thread);
2967 static struct md_sysfs_entry md_level =
2968 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
2972 layout_show(mddev_t *mddev, char *page)
2974 /* just a number, not meaningful for all levels */
2975 if (mddev->reshape_position != MaxSector &&
2976 mddev->layout != mddev->new_layout)
2977 return sprintf(page, "%d (%d)\n",
2978 mddev->new_layout, mddev->layout);
2979 return sprintf(page, "%d\n", mddev->layout);
2983 layout_store(mddev_t *mddev, const char *buf, size_t len)
2986 unsigned long n = simple_strtoul(buf, &e, 10);
2988 if (!*buf || (*e && *e != '\n'))
2993 if (mddev->pers->check_reshape == NULL)
2995 mddev->new_layout = n;
2996 err = mddev->pers->check_reshape(mddev);
2998 mddev->new_layout = mddev->layout;
3002 mddev->new_layout = n;
3003 if (mddev->reshape_position == MaxSector)
3008 static struct md_sysfs_entry md_layout =
3009 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
3013 raid_disks_show(mddev_t *mddev, char *page)
3015 if (mddev->raid_disks == 0)
3017 if (mddev->reshape_position != MaxSector &&
3018 mddev->delta_disks != 0)
3019 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
3020 mddev->raid_disks - mddev->delta_disks);
3021 return sprintf(page, "%d\n", mddev->raid_disks);
3024 static int update_raid_disks(mddev_t *mddev, int raid_disks);
3027 raid_disks_store(mddev_t *mddev, const char *buf, size_t len)
3031 unsigned long n = simple_strtoul(buf, &e, 10);
3033 if (!*buf || (*e && *e != '\n'))
3037 rv = update_raid_disks(mddev, n);
3038 else if (mddev->reshape_position != MaxSector) {
3039 int olddisks = mddev->raid_disks - mddev->delta_disks;
3040 mddev->delta_disks = n - olddisks;
3041 mddev->raid_disks = n;
3043 mddev->raid_disks = n;
3044 return rv ? rv : len;
3046 static struct md_sysfs_entry md_raid_disks =
3047 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
3050 chunk_size_show(mddev_t *mddev, char *page)
3052 if (mddev->reshape_position != MaxSector &&
3053 mddev->chunk_sectors != mddev->new_chunk_sectors)
3054 return sprintf(page, "%d (%d)\n",
3055 mddev->new_chunk_sectors << 9,
3056 mddev->chunk_sectors << 9);
3057 return sprintf(page, "%d\n", mddev->chunk_sectors << 9);
3061 chunk_size_store(mddev_t *mddev, const char *buf, size_t len)
3064 unsigned long n = simple_strtoul(buf, &e, 10);
3066 if (!*buf || (*e && *e != '\n'))
3071 if (mddev->pers->check_reshape == NULL)
3073 mddev->new_chunk_sectors = n >> 9;
3074 err = mddev->pers->check_reshape(mddev);
3076 mddev->new_chunk_sectors = mddev->chunk_sectors;
3080 mddev->new_chunk_sectors = n >> 9;
3081 if (mddev->reshape_position == MaxSector)
3082 mddev->chunk_sectors = n >> 9;
3086 static struct md_sysfs_entry md_chunk_size =
3087 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
3090 resync_start_show(mddev_t *mddev, char *page)
3092 if (mddev->recovery_cp == MaxSector)
3093 return sprintf(page, "none\n");
3094 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
3098 resync_start_store(mddev_t *mddev, const char *buf, size_t len)
3101 unsigned long long n = simple_strtoull(buf, &e, 10);
3105 if (!*buf || (*e && *e != '\n'))
3108 mddev->recovery_cp = n;
3111 static struct md_sysfs_entry md_resync_start =
3112 __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store);
3115 * The array state can be:
3118 * No devices, no size, no level
3119 * Equivalent to STOP_ARRAY ioctl
3121 * May have some settings, but array is not active
3122 * all IO results in error
3123 * When written, doesn't tear down array, but just stops it
3124 * suspended (not supported yet)
3125 * All IO requests will block. The array can be reconfigured.
3126 * Writing this, if accepted, will block until array is quiescent
3128 * no resync can happen. no superblocks get written.
3129 * write requests fail
3131 * like readonly, but behaves like 'clean' on a write request.
3133 * clean - no pending writes, but otherwise active.
3134 * When written to inactive array, starts without resync
3135 * If a write request arrives then
3136 * if metadata is known, mark 'dirty' and switch to 'active'.
3137 * if not known, block and switch to write-pending
3138 * If written to an active array that has pending writes, then fails.
3140 * fully active: IO and resync can be happening.
3141 * When written to inactive array, starts with resync
3144 * clean, but writes are blocked waiting for 'active' to be written.
3147 * like active, but no writes have been seen for a while (100msec).
3150 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
3151 write_pending, active_idle, bad_word};
3152 static char *array_states[] = {
3153 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3154 "write-pending", "active-idle", NULL };
3156 static int match_word(const char *word, char **list)
3159 for (n=0; list[n]; n++)
3160 if (cmd_match(word, list[n]))
3166 array_state_show(mddev_t *mddev, char *page)
3168 enum array_state st = inactive;
3181 else if (test_bit(MD_CHANGE_CLEAN, &mddev->flags))
3183 else if (mddev->safemode)
3189 if (list_empty(&mddev->disks) &&
3190 mddev->raid_disks == 0 &&
3191 mddev->dev_sectors == 0)
3196 return sprintf(page, "%s\n", array_states[st]);
3199 static int do_md_stop(mddev_t * mddev, int ro, int is_open);
3200 static int do_md_run(mddev_t * mddev);
3201 static int restart_array(mddev_t *mddev);
3204 array_state_store(mddev_t *mddev, const char *buf, size_t len)
3207 enum array_state st = match_word(buf, array_states);
3212 /* stopping an active array */
3213 if (atomic_read(&mddev->openers) > 0)
3215 err = do_md_stop(mddev, 0, 0);
3218 /* stopping an active array */
3220 if (atomic_read(&mddev->openers) > 0)
3222 err = do_md_stop(mddev, 2, 0);
3224 err = 0; /* already inactive */
3227 break; /* not supported yet */
3230 err = do_md_stop(mddev, 1, 0);
3233 set_disk_ro(mddev->gendisk, 1);
3234 err = do_md_run(mddev);
3240 err = do_md_stop(mddev, 1, 0);
3241 else if (mddev->ro == 1)
3242 err = restart_array(mddev);
3245 set_disk_ro(mddev->gendisk, 0);
3249 err = do_md_run(mddev);
3254 restart_array(mddev);
3255 spin_lock_irq(&mddev->write_lock);
3256 if (atomic_read(&mddev->writes_pending) == 0) {
3257 if (mddev->in_sync == 0) {
3259 if (mddev->safemode == 1)
3260 mddev->safemode = 0;
3261 if (mddev->persistent)
3262 set_bit(MD_CHANGE_CLEAN,
3268 spin_unlock_irq(&mddev->write_lock);
3274 restart_array(mddev);
3275 if (mddev->external)
3276 clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
3277 wake_up(&mddev->sb_wait);
3281 set_disk_ro(mddev->gendisk, 0);
3282 err = do_md_run(mddev);
3287 /* these cannot be set */
3293 sysfs_notify_dirent(mddev->sysfs_state);
3297 static struct md_sysfs_entry md_array_state =
3298 __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
3301 max_corrected_read_errors_show(mddev_t *mddev, char *page) {
3302 return sprintf(page, "%d\n",
3303 atomic_read(&mddev->max_corr_read_errors));
3307 max_corrected_read_errors_store(mddev_t *mddev, const char *buf, size_t len)
3310 unsigned long n = simple_strtoul(buf, &e, 10);
3312 if (*buf && (*e == 0 || *e == '\n')) {
3313 atomic_set(&mddev->max_corr_read_errors, n);
3319 static struct md_sysfs_entry max_corr_read_errors =
3320 __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show,
3321 max_corrected_read_errors_store);
3324 null_show(mddev_t *mddev, char *page)
3330 new_dev_store(mddev_t *mddev, const char *buf, size_t len)
3332 /* buf must be %d:%d\n? giving major and minor numbers */
3333 /* The new device is added to the array.
3334 * If the array has a persistent superblock, we read the
3335 * superblock to initialise info and check validity.
3336 * Otherwise, only checking done is that in bind_rdev_to_array,
3337 * which mainly checks size.
3340 int major = simple_strtoul(buf, &e, 10);
3346 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
3348 minor = simple_strtoul(e+1, &e, 10);
3349 if (*e && *e != '\n')
3351 dev = MKDEV(major, minor);
3352 if (major != MAJOR(dev) ||
3353 minor != MINOR(dev))
3357 if (mddev->persistent) {
3358 rdev = md_import_device(dev, mddev->major_version,
3359 mddev->minor_version);
3360 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
3361 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
3362 mdk_rdev_t, same_set);
3363 err = super_types[mddev->major_version]
3364 .load_super(rdev, rdev0, mddev->minor_version);
3368 } else if (mddev->external)
3369 rdev = md_import_device(dev, -2, -1);
3371 rdev = md_import_device(dev, -1, -1);
3374 return PTR_ERR(rdev);
3375 err = bind_rdev_to_array(rdev, mddev);
3379 return err ? err : len;
3382 static struct md_sysfs_entry md_new_device =
3383 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
3386 bitmap_store(mddev_t *mddev, const char *buf, size_t len)
3389 unsigned long chunk, end_chunk;
3393 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
3395 chunk = end_chunk = simple_strtoul(buf, &end, 0);
3396 if (buf == end) break;
3397 if (*end == '-') { /* range */
3399 end_chunk = simple_strtoul(buf, &end, 0);
3400 if (buf == end) break;
3402 if (*end && !isspace(*end)) break;
3403 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
3405 while (isspace(*buf)) buf++;
3407 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
3412 static struct md_sysfs_entry md_bitmap =
3413 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
3416 size_show(mddev_t *mddev, char *page)
3418 return sprintf(page, "%llu\n",
3419 (unsigned long long)mddev->dev_sectors / 2);
3422 static int update_size(mddev_t *mddev, sector_t num_sectors);
3425 size_store(mddev_t *mddev, const char *buf, size_t len)
3427 /* If array is inactive, we can reduce the component size, but
3428 * not increase it (except from 0).
3429 * If array is active, we can try an on-line resize
3432 int err = strict_blocks_to_sectors(buf, §ors);
3437 err = update_size(mddev, sectors);
3438 md_update_sb(mddev, 1);
3440 if (mddev->dev_sectors == 0 ||
3441 mddev->dev_sectors > sectors)
3442 mddev->dev_sectors = sectors;
3446 return err ? err : len;
3449 static struct md_sysfs_entry md_size =
3450 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
3455 * 'none' for arrays with no metadata (good luck...)
3456 * 'external' for arrays with externally managed metadata,
3457 * or N.M for internally known formats
3460 metadata_show(mddev_t *mddev, char *page)
3462 if (mddev->persistent)
3463 return sprintf(page, "%d.%d\n",
3464 mddev->major_version, mddev->minor_version);
3465 else if (mddev->external)
3466 return sprintf(page, "external:%s\n", mddev->metadata_type);
3468 return sprintf(page, "none\n");
3472 metadata_store(mddev_t *mddev, const char *buf, size_t len)
3476 /* Changing the details of 'external' metadata is
3477 * always permitted. Otherwise there must be
3478 * no devices attached to the array.
3480 if (mddev->external && strncmp(buf, "external:", 9) == 0)
3482 else if (!list_empty(&mddev->disks))
3485 if (cmd_match(buf, "none")) {
3486 mddev->persistent = 0;
3487 mddev->external = 0;
3488 mddev->major_version = 0;
3489 mddev->minor_version = 90;
3492 if (strncmp(buf, "external:", 9) == 0) {
3493 size_t namelen = len-9;
3494 if (namelen >= sizeof(mddev->metadata_type))
3495 namelen = sizeof(mddev->metadata_type)-1;
3496 strncpy(mddev->metadata_type, buf+9, namelen);
3497 mddev->metadata_type[namelen] = 0;
3498 if (namelen && mddev->metadata_type[namelen-1] == '\n')
3499 mddev->metadata_type[--namelen] = 0;
3500 mddev->persistent = 0;
3501 mddev->external = 1;
3502 mddev->major_version = 0;
3503 mddev->minor_version = 90;
3506 major = simple_strtoul(buf, &e, 10);
3507 if (e==buf || *e != '.')
3510 minor = simple_strtoul(buf, &e, 10);
3511 if (e==buf || (*e && *e != '\n') )
3513 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
3515 mddev->major_version = major;
3516 mddev->minor_version = minor;
3517 mddev->persistent = 1;
3518 mddev->external = 0;
3522 static struct md_sysfs_entry md_metadata =
3523 __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
3526 action_show(mddev_t *mddev, char *page)
3528 char *type = "idle";
3529 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
3531 else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3532 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) {
3533 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
3535 else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
3536 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
3538 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
3542 } else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
3545 return sprintf(page, "%s\n", type);
3549 action_store(mddev_t *mddev, const char *page, size_t len)
3551 if (!mddev->pers || !mddev->pers->sync_request)
3554 if (cmd_match(page, "frozen"))
3555 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3557 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3559 if (cmd_match(page, "idle") || cmd_match(page, "frozen")) {
3560 if (mddev->sync_thread) {
3561 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
3562 md_unregister_thread(mddev->sync_thread);
3563 mddev->sync_thread = NULL;
3564 mddev->recovery = 0;
3566 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3567 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
3569 else if (cmd_match(page, "resync"))
3570 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3571 else if (cmd_match(page, "recover")) {
3572 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
3573 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3574 } else if (cmd_match(page, "reshape")) {
3576 if (mddev->pers->start_reshape == NULL)
3578 err = mddev->pers->start_reshape(mddev);
3581 sysfs_notify(&mddev->kobj, NULL, "degraded");
3583 if (cmd_match(page, "check"))
3584 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
3585 else if (!cmd_match(page, "repair"))
3587 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
3588 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
3590 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3591 md_wakeup_thread(mddev->thread);
3592 sysfs_notify_dirent(mddev->sysfs_action);
3597 mismatch_cnt_show(mddev_t *mddev, char *page)
3599 return sprintf(page, "%llu\n",
3600 (unsigned long long) mddev->resync_mismatches);
3603 static struct md_sysfs_entry md_scan_mode =
3604 __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
3607 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
3610 sync_min_show(mddev_t *mddev, char *page)
3612 return sprintf(page, "%d (%s)\n", speed_min(mddev),
3613 mddev->sync_speed_min ? "local": "system");
3617 sync_min_store(mddev_t *mddev, const char *buf, size_t len)
3621 if (strncmp(buf, "system", 6)==0) {
3622 mddev->sync_speed_min = 0;
3625 min = simple_strtoul(buf, &e, 10);
3626 if (buf == e || (*e && *e != '\n') || min <= 0)
3628 mddev->sync_speed_min = min;
3632 static struct md_sysfs_entry md_sync_min =
3633 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
3636 sync_max_show(mddev_t *mddev, char *page)
3638 return sprintf(page, "%d (%s)\n", speed_max(mddev),
3639 mddev->sync_speed_max ? "local": "system");
3643 sync_max_store(mddev_t *mddev, const char *buf, size_t len)
3647 if (strncmp(buf, "system", 6)==0) {
3648 mddev->sync_speed_max = 0;
3651 max = simple_strtoul(buf, &e, 10);
3652 if (buf == e || (*e && *e != '\n') || max <= 0)
3654 mddev->sync_speed_max = max;
3658 static struct md_sysfs_entry md_sync_max =
3659 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
3662 degraded_show(mddev_t *mddev, char *page)
3664 return sprintf(page, "%d\n", mddev->degraded);
3666 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
3669 sync_force_parallel_show(mddev_t *mddev, char *page)
3671 return sprintf(page, "%d\n", mddev->parallel_resync);
3675 sync_force_parallel_store(mddev_t *mddev, const char *buf, size_t len)
3679 if (strict_strtol(buf, 10, &n))
3682 if (n != 0 && n != 1)
3685 mddev->parallel_resync = n;
3687 if (mddev->sync_thread)
3688 wake_up(&resync_wait);
3693 /* force parallel resync, even with shared block devices */
3694 static struct md_sysfs_entry md_sync_force_parallel =
3695 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
3696 sync_force_parallel_show, sync_force_parallel_store);
3699 sync_speed_show(mddev_t *mddev, char *page)
3701 unsigned long resync, dt, db;
3702 if (mddev->curr_resync == 0)
3703 return sprintf(page, "none\n");
3704 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
3705 dt = (jiffies - mddev->resync_mark) / HZ;
3707 db = resync - mddev->resync_mark_cnt;
3708 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
3711 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
3714 sync_completed_show(mddev_t *mddev, char *page)
3716 unsigned long max_sectors, resync;
3718 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3719 return sprintf(page, "none\n");
3721 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
3722 max_sectors = mddev->resync_max_sectors;
3724 max_sectors = mddev->dev_sectors;
3726 resync = mddev->curr_resync_completed;
3727 return sprintf(page, "%lu / %lu\n", resync, max_sectors);
3730 static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed);
3733 min_sync_show(mddev_t *mddev, char *page)
3735 return sprintf(page, "%llu\n",
3736 (unsigned long long)mddev->resync_min);
3739 min_sync_store(mddev_t *mddev, const char *buf, size_t len)
3741 unsigned long long min;
3742 if (strict_strtoull(buf, 10, &min))
3744 if (min > mddev->resync_max)
3746 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3749 /* Must be a multiple of chunk_size */
3750 if (mddev->chunk_sectors) {
3751 sector_t temp = min;
3752 if (sector_div(temp, mddev->chunk_sectors))
3755 mddev->resync_min = min;
3760 static struct md_sysfs_entry md_min_sync =
3761 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
3764 max_sync_show(mddev_t *mddev, char *page)
3766 if (mddev->resync_max == MaxSector)
3767 return sprintf(page, "max\n");
3769 return sprintf(page, "%llu\n",
3770 (unsigned long long)mddev->resync_max);
3773 max_sync_store(mddev_t *mddev, const char *buf, size_t len)
3775 if (strncmp(buf, "max", 3) == 0)
3776 mddev->resync_max = MaxSector;
3778 unsigned long long max;
3779 if (strict_strtoull(buf, 10, &max))
3781 if (max < mddev->resync_min)
3783 if (max < mddev->resync_max &&
3785 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3788 /* Must be a multiple of chunk_size */
3789 if (mddev->chunk_sectors) {
3790 sector_t temp = max;
3791 if (sector_div(temp, mddev->chunk_sectors))
3794 mddev->resync_max = max;
3796 wake_up(&mddev->recovery_wait);
3800 static struct md_sysfs_entry md_max_sync =
3801 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
3804 suspend_lo_show(mddev_t *mddev, char *page)
3806 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
3810 suspend_lo_store(mddev_t *mddev, const char *buf, size_t len)
3813 unsigned long long new = simple_strtoull(buf, &e, 10);
3815 if (mddev->pers == NULL ||
3816 mddev->pers->quiesce == NULL)
3818 if (buf == e || (*e && *e != '\n'))
3820 if (new >= mddev->suspend_hi ||
3821 (new > mddev->suspend_lo && new < mddev->suspend_hi)) {
3822 mddev->suspend_lo = new;
3823 mddev->pers->quiesce(mddev, 2);
3828 static struct md_sysfs_entry md_suspend_lo =
3829 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
3833 suspend_hi_show(mddev_t *mddev, char *page)
3835 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
3839 suspend_hi_store(mddev_t *mddev, const char *buf, size_t len)
3842 unsigned long long new = simple_strtoull(buf, &e, 10);
3844 if (mddev->pers == NULL ||
3845 mddev->pers->quiesce == NULL)
3847 if (buf == e || (*e && *e != '\n'))
3849 if ((new <= mddev->suspend_lo && mddev->suspend_lo >= mddev->suspend_hi) ||
3850 (new > mddev->suspend_lo && new > mddev->suspend_hi)) {
3851 mddev->suspend_hi = new;
3852 mddev->pers->quiesce(mddev, 1);
3853 mddev->pers->quiesce(mddev, 0);
3858 static struct md_sysfs_entry md_suspend_hi =
3859 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
3862 reshape_position_show(mddev_t *mddev, char *page)
3864 if (mddev->reshape_position != MaxSector)
3865 return sprintf(page, "%llu\n",
3866 (unsigned long long)mddev->reshape_position);
3867 strcpy(page, "none\n");
3872 reshape_position_store(mddev_t *mddev, const char *buf, size_t len)
3875 unsigned long long new = simple_strtoull(buf, &e, 10);
3878 if (buf == e || (*e && *e != '\n'))
3880 mddev->reshape_position = new;
3881 mddev->delta_disks = 0;
3882 mddev->new_level = mddev->level;
3883 mddev->new_layout = mddev->layout;
3884 mddev->new_chunk_sectors = mddev->chunk_sectors;
3888 static struct md_sysfs_entry md_reshape_position =
3889 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
3890 reshape_position_store);
3893 array_size_show(mddev_t *mddev, char *page)
3895 if (mddev->external_size)
3896 return sprintf(page, "%llu\n",
3897 (unsigned long long)mddev->array_sectors/2);
3899 return sprintf(page, "default\n");
3903 array_size_store(mddev_t *mddev, const char *buf, size_t len)
3907 if (strncmp(buf, "default", 7) == 0) {
3909 sectors = mddev->pers->size(mddev, 0, 0);
3911 sectors = mddev->array_sectors;
3913 mddev->external_size = 0;
3915 if (strict_blocks_to_sectors(buf, §ors) < 0)
3917 if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors)
3920 mddev->external_size = 1;
3923 mddev->array_sectors = sectors;
3924 set_capacity(mddev->gendisk, mddev->array_sectors);
3926 revalidate_disk(mddev->gendisk);
3931 static struct md_sysfs_entry md_array_size =
3932 __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show,
3935 static struct attribute *md_default_attrs[] = {
3938 &md_raid_disks.attr,
3939 &md_chunk_size.attr,
3941 &md_resync_start.attr,
3943 &md_new_device.attr,
3944 &md_safe_delay.attr,
3945 &md_array_state.attr,
3946 &md_reshape_position.attr,
3947 &md_array_size.attr,
3948 &max_corr_read_errors.attr,
3952 static struct attribute *md_redundancy_attrs[] = {
3954 &md_mismatches.attr,
3957 &md_sync_speed.attr,
3958 &md_sync_force_parallel.attr,
3959 &md_sync_completed.attr,
3962 &md_suspend_lo.attr,
3963 &md_suspend_hi.attr,
3968 static struct attribute_group md_redundancy_group = {
3970 .attrs = md_redundancy_attrs,
3975 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
3977 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
3978 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
3983 rv = mddev_lock(mddev);
3985 rv = entry->show(mddev, page);
3986 mddev_unlock(mddev);
3992 md_attr_store(struct kobject *kobj, struct attribute *attr,
3993 const char *page, size_t length)
3995 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
3996 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
4001 if (!capable(CAP_SYS_ADMIN))
4003 rv = mddev_lock(mddev);
4004 if (mddev->hold_active == UNTIL_IOCTL)
4005 mddev->hold_active = 0;
4007 rv = entry->store(mddev, page, length);
4008 mddev_unlock(mddev);
4013 static void md_free(struct kobject *ko)
4015 mddev_t *mddev = container_of(ko, mddev_t, kobj);
4017 if (mddev->sysfs_state)
4018 sysfs_put(mddev->sysfs_state);
4020 if (mddev->gendisk) {
4021 del_gendisk(mddev->gendisk);
4022 put_disk(mddev->gendisk);
4025 blk_cleanup_queue(mddev->queue);
4030 static struct sysfs_ops md_sysfs_ops = {
4031 .show = md_attr_show,
4032 .store = md_attr_store,
4034 static struct kobj_type md_ktype = {
4036 .sysfs_ops = &md_sysfs_ops,
4037 .default_attrs = md_default_attrs,
4042 static void mddev_delayed_delete(struct work_struct *ws)
4044 mddev_t *mddev = container_of(ws, mddev_t, del_work);
4046 if (mddev->private == &md_redundancy_group) {
4047 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
4048 if (mddev->sysfs_action)
4049 sysfs_put(mddev->sysfs_action);
4050 mddev->sysfs_action = NULL;
4051 mddev->private = NULL;
4053 sysfs_remove_group(&mddev->kobj, &md_bitmap_group);
4054 kobject_del(&mddev->kobj);
4055 kobject_put(&mddev->kobj);
4058 static int md_alloc(dev_t dev, char *name)
4060 static DEFINE_MUTEX(disks_mutex);
4061 mddev_t *mddev = mddev_find(dev);
4062 struct gendisk *disk;
4071 partitioned = (MAJOR(mddev->unit) != MD_MAJOR);
4072 shift = partitioned ? MdpMinorShift : 0;
4073 unit = MINOR(mddev->unit) >> shift;
4075 /* wait for any previous instance if this device
4076 * to be completed removed (mddev_delayed_delete).
4078 flush_scheduled_work();
4080 mutex_lock(&disks_mutex);
4086 /* Need to ensure that 'name' is not a duplicate.
4089 spin_lock(&all_mddevs_lock);
4091 list_for_each_entry(mddev2, &all_mddevs, all_mddevs)
4092 if (mddev2->gendisk &&
4093 strcmp(mddev2->gendisk->disk_name, name) == 0) {
4094 spin_unlock(&all_mddevs_lock);
4097 spin_unlock(&all_mddevs_lock);
4101 mddev->queue = blk_alloc_queue(GFP_KERNEL);
4104 mddev->queue->queuedata = mddev;
4106 /* Can be unlocked because the queue is new: no concurrency */
4107 queue_flag_set_unlocked(QUEUE_FLAG_CLUSTER, mddev->queue);
4109 blk_queue_make_request(mddev->queue, md_make_request);
4111 disk = alloc_disk(1 << shift);
4113 blk_cleanup_queue(mddev->queue);
4114 mddev->queue = NULL;
4117 disk->major = MAJOR(mddev->unit);
4118 disk->first_minor = unit << shift;
4120 strcpy(disk->disk_name, name);
4121 else if (partitioned)
4122 sprintf(disk->disk_name, "md_d%d", unit);
4124 sprintf(disk->disk_name, "md%d", unit);
4125 disk->fops = &md_fops;
4126 disk->private_data = mddev;
4127 disk->queue = mddev->queue;
4128 /* Allow extended partitions. This makes the
4129 * 'mdp' device redundant, but we can't really
4132 disk->flags |= GENHD_FL_EXT_DEVT;
4134 mddev->gendisk = disk;
4135 error = kobject_init_and_add(&mddev->kobj, &md_ktype,
4136 &disk_to_dev(disk)->kobj, "%s", "md");
4138 /* This isn't possible, but as kobject_init_and_add is marked
4139 * __must_check, we must do something with the result
4141 printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
4145 if (sysfs_create_group(&mddev->kobj, &md_bitmap_group))
4146 printk(KERN_DEBUG "pointless warning\n");
4148 mutex_unlock(&disks_mutex);
4150 kobject_uevent(&mddev->kobj, KOBJ_ADD);
4151 mddev->sysfs_state = sysfs_get_dirent(mddev->kobj.sd, "array_state");
4157 static struct kobject *md_probe(dev_t dev, int *part, void *data)
4159 md_alloc(dev, NULL);
4163 static int add_named_array(const char *val, struct kernel_param *kp)
4165 /* val must be "md_*" where * is not all digits.
4166 * We allocate an array with a large free minor number, and
4167 * set the name to val. val must not already be an active name.
4169 int len = strlen(val);
4170 char buf[DISK_NAME_LEN];
4172 while (len && val[len-1] == '\n')
4174 if (len >= DISK_NAME_LEN)
4176 strlcpy(buf, val, len+1);
4177 if (strncmp(buf, "md_", 3) != 0)
4179 return md_alloc(0, buf);
4182 static void md_safemode_timeout(unsigned long data)
4184 mddev_t *mddev = (mddev_t *) data;
4186 if (!atomic_read(&mddev->writes_pending)) {
4187 mddev->safemode = 1;
4188 if (mddev->external)
4189 sysfs_notify_dirent(mddev->sysfs_state);
4191 md_wakeup_thread(mddev->thread);
4194 static int start_dirty_degraded;
4196 static int do_md_run(mddev_t * mddev)
4200 struct gendisk *disk;
4201 struct mdk_personality *pers;
4203 if (list_empty(&mddev->disks))
4204 /* cannot run an array with no devices.. */
4211 * Analyze all RAID superblock(s)
4213 if (!mddev->raid_disks) {
4214 if (!mddev->persistent)
4219 if (mddev->level != LEVEL_NONE)
4220 request_module("md-level-%d", mddev->level);
4221 else if (mddev->clevel[0])
4222 request_module("md-%s", mddev->clevel);
4225 * Drop all container device buffers, from now on
4226 * the only valid external interface is through the md
4229 list_for_each_entry(rdev, &mddev->disks, same_set) {
4230 if (test_bit(Faulty, &rdev->flags))
4232 sync_blockdev(rdev->bdev);
4233 invalidate_bdev(rdev->bdev);
4235 /* perform some consistency tests on the device.
4236 * We don't want the data to overlap the metadata,
4237 * Internal Bitmap issues have been handled elsewhere.
4239 if (rdev->data_offset < rdev->sb_start) {
4240 if (mddev->dev_sectors &&
4241 rdev->data_offset + mddev->dev_sectors
4243 printk("md: %s: data overlaps metadata\n",
4248 if (rdev->sb_start + rdev->sb_size/512
4249 > rdev->data_offset) {
4250 printk("md: %s: metadata overlaps data\n",
4255 sysfs_notify_dirent(rdev->sysfs_state);
4258 md_probe(mddev->unit, NULL, NULL);
4259 disk = mddev->gendisk;
4263 spin_lock(&pers_lock);
4264 pers = find_pers(mddev->level, mddev->clevel);
4265 if (!pers || !try_module_get(pers->owner)) {
4266 spin_unlock(&pers_lock);
4267 if (mddev->level != LEVEL_NONE)
4268 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
4271 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
4276 spin_unlock(&pers_lock);
4277 if (mddev->level != pers->level) {
4278 mddev->level = pers->level;
4279 mddev->new_level = pers->level;
4281 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
4283 if (mddev->reshape_position != MaxSector &&
4284 pers->start_reshape == NULL) {
4285 /* This personality cannot handle reshaping... */
4287 module_put(pers->owner);
4291 if (pers->sync_request) {
4292 /* Warn if this is a potentially silly
4295 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
4299 list_for_each_entry(rdev, &mddev->disks, same_set)
4300 list_for_each_entry(rdev2, &mddev->disks, same_set) {
4302 rdev->bdev->bd_contains ==
4303 rdev2->bdev->bd_contains) {
4305 "%s: WARNING: %s appears to be"
4306 " on the same physical disk as"
4309 bdevname(rdev->bdev,b),
4310 bdevname(rdev2->bdev,b2));
4317 "True protection against single-disk"
4318 " failure might be compromised.\n");
4321 mddev->recovery = 0;
4322 /* may be over-ridden by personality */
4323 mddev->resync_max_sectors = mddev->dev_sectors;
4325 mddev->barriers_work = 1;
4326 mddev->ok_start_degraded = start_dirty_degraded;
4329 mddev->ro = 2; /* read-only, but switch on first write */
4331 err = mddev->pers->run(mddev);
4333 printk(KERN_ERR "md: pers->run() failed ...\n");
4334 else if (mddev->pers->size(mddev, 0, 0) < mddev->array_sectors) {
4335 WARN_ONCE(!mddev->external_size, "%s: default size too small,"
4336 " but 'external_size' not in effect?\n", __func__);
4338 "md: invalid array_size %llu > default size %llu\n",
4339 (unsigned long long)mddev->array_sectors / 2,
4340 (unsigned long long)mddev->pers->size(mddev, 0, 0) / 2);
4342 mddev->pers->stop(mddev);
4344 if (err == 0 && mddev->pers->sync_request) {
4345 err = bitmap_create(mddev);
4347 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
4348 mdname(mddev), err);
4349 mddev->pers->stop(mddev);
4353 module_put(mddev->pers->owner);
4355 bitmap_destroy(mddev);
4358 if (mddev->pers->sync_request) {
4359 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
4361 "md: cannot register extra attributes for %s\n",
4363 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action");
4364 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
4367 atomic_set(&mddev->writes_pending,0);
4368 atomic_set(&mddev->max_corr_read_errors,
4369 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS);
4370 mddev->safemode = 0;
4371 mddev->safemode_timer.function = md_safemode_timeout;
4372 mddev->safemode_timer.data = (unsigned long) mddev;
4373 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
4376 list_for_each_entry(rdev, &mddev->disks, same_set)
4377 if (rdev->raid_disk >= 0) {
4379 sprintf(nm, "rd%d", rdev->raid_disk);
4380 if (sysfs_create_link(&mddev->kobj, &rdev->kobj, nm))
4381 printk("md: cannot register %s for %s\n",
4385 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4388 md_update_sb(mddev, 0);
4390 set_capacity(disk, mddev->array_sectors);
4392 /* If there is a partially-recovered drive we need to
4393 * start recovery here. If we leave it to md_check_recovery,
4394 * it will remove the drives and not do the right thing
4396 if (mddev->degraded && !mddev->sync_thread) {
4398 list_for_each_entry(rdev, &mddev->disks, same_set)
4399 if (rdev->raid_disk >= 0 &&
4400 !test_bit(In_sync, &rdev->flags) &&
4401 !test_bit(Faulty, &rdev->flags))
4402 /* complete an interrupted recovery */
4404 if (spares && mddev->pers->sync_request) {
4405 mddev->recovery = 0;
4406 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
4407 mddev->sync_thread = md_register_thread(md_do_sync,
4410 if (!mddev->sync_thread) {
4411 printk(KERN_ERR "%s: could not start resync"
4414 /* leave the spares where they are, it shouldn't hurt */
4415 mddev->recovery = 0;
4419 md_wakeup_thread(mddev->thread);
4420 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
4422 revalidate_disk(mddev->gendisk);
4424 md_new_event(mddev);
4425 sysfs_notify_dirent(mddev->sysfs_state);
4426 if (mddev->sysfs_action)
4427 sysfs_notify_dirent(mddev->sysfs_action);
4428 sysfs_notify(&mddev->kobj, NULL, "degraded");
4429 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
4433 static int restart_array(mddev_t *mddev)
4435 struct gendisk *disk = mddev->gendisk;
4437 /* Complain if it has no devices */
4438 if (list_empty(&mddev->disks))
4444 mddev->safemode = 0;
4446 set_disk_ro(disk, 0);
4447 printk(KERN_INFO "md: %s switched to read-write mode.\n",
4449 /* Kick recovery or resync if necessary */
4450 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4451 md_wakeup_thread(mddev->thread);
4452 md_wakeup_thread(mddev->sync_thread);
4453 sysfs_notify_dirent(mddev->sysfs_state);
4457 /* similar to deny_write_access, but accounts for our holding a reference
4458 * to the file ourselves */
4459 static int deny_bitmap_write_access(struct file * file)
4461 struct inode *inode = file->f_mapping->host;
4463 spin_lock(&inode->i_lock);
4464 if (atomic_read(&inode->i_writecount) > 1) {
4465 spin_unlock(&inode->i_lock);
4468 atomic_set(&inode->i_writecount, -1);
4469 spin_unlock(&inode->i_lock);
4474 void restore_bitmap_write_access(struct file *file)
4476 struct inode *inode = file->f_mapping->host;
4478 spin_lock(&inode->i_lock);
4479 atomic_set(&inode->i_writecount, 1);
4480 spin_unlock(&inode->i_lock);
4484 * 0 - completely stop and dis-assemble array
4485 * 1 - switch to readonly
4486 * 2 - stop but do not disassemble array
4488 static int do_md_stop(mddev_t * mddev, int mode, int is_open)
4491 struct gendisk *disk = mddev->gendisk;
4494 mutex_lock(&mddev->open_mutex);
4495 if (atomic_read(&mddev->openers) > is_open) {
4496 printk("md: %s still in use.\n",mdname(mddev));
4498 } else if (mddev->pers) {
4500 if (mddev->sync_thread) {
4501 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4502 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4503 md_unregister_thread(mddev->sync_thread);
4504 mddev->sync_thread = NULL;
4507 del_timer_sync(&mddev->safemode_timer);
4510 case 1: /* readonly */
4516 case 0: /* disassemble */
4518 bitmap_flush(mddev);
4519 md_super_wait(mddev);
4521 set_disk_ro(disk, 0);
4523 mddev->pers->stop(mddev);
4524 mddev->queue->merge_bvec_fn = NULL;
4525 mddev->queue->unplug_fn = NULL;
4526 mddev->queue->backing_dev_info.congested_fn = NULL;
4527 module_put(mddev->pers->owner);
4528 if (mddev->pers->sync_request)
4529 mddev->private = &md_redundancy_group;
4531 /* tell userspace to handle 'inactive' */
4532 sysfs_notify_dirent(mddev->sysfs_state);
4534 list_for_each_entry(rdev, &mddev->disks, same_set)
4535 if (rdev->raid_disk >= 0) {
4537 sprintf(nm, "rd%d", rdev->raid_disk);
4538 sysfs_remove_link(&mddev->kobj, nm);
4541 set_capacity(disk, 0);
4547 if (!mddev->in_sync || mddev->flags) {
4548 /* mark array as shutdown cleanly */
4550 md_update_sb(mddev, 1);
4553 set_disk_ro(disk, 1);
4554 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4558 mutex_unlock(&mddev->open_mutex);
4562 * Free resources if final stop
4566 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
4568 bitmap_destroy(mddev);
4569 if (mddev->bitmap_info.file) {
4570 restore_bitmap_write_access(mddev->bitmap_info.file);
4571 fput(mddev->bitmap_info.file);
4572 mddev->bitmap_info.file = NULL;
4574 mddev->bitmap_info.offset = 0;
4576 /* make sure all md_delayed_delete calls have finished */
4577 flush_scheduled_work();
4579 export_array(mddev);
4581 mddev->array_sectors = 0;
4582 mddev->external_size = 0;
4583 mddev->dev_sectors = 0;
4584 mddev->raid_disks = 0;
4585 mddev->recovery_cp = 0;
4586 mddev->resync_min = 0;
4587 mddev->resync_max = MaxSector;
4588 mddev->reshape_position = MaxSector;
4589 mddev->external = 0;
4590 mddev->persistent = 0;
4591 mddev->level = LEVEL_NONE;
4592 mddev->clevel[0] = 0;
4595 mddev->metadata_type[0] = 0;
4596 mddev->chunk_sectors = 0;
4597 mddev->ctime = mddev->utime = 0;
4599 mddev->max_disks = 0;
4601 mddev->delta_disks = 0;
4602 mddev->new_level = LEVEL_NONE;
4603 mddev->new_layout = 0;
4604 mddev->new_chunk_sectors = 0;
4605 mddev->curr_resync = 0;
4606 mddev->resync_mismatches = 0;
4607 mddev->suspend_lo = mddev->suspend_hi = 0;
4608 mddev->sync_speed_min = mddev->sync_speed_max = 0;
4609 mddev->recovery = 0;
4612 mddev->degraded = 0;
4613 mddev->barriers_work = 0;
4614 mddev->safemode = 0;
4615 mddev->bitmap_info.offset = 0;
4616 mddev->bitmap_info.default_offset = 0;
4617 mddev->bitmap_info.chunksize = 0;
4618 mddev->bitmap_info.daemon_sleep = 0;
4619 mddev->bitmap_info.max_write_behind = 0;
4620 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
4621 if (mddev->hold_active == UNTIL_STOP)
4622 mddev->hold_active = 0;
4624 } else if (mddev->pers)
4625 printk(KERN_INFO "md: %s switched to read-only mode.\n",
4628 blk_integrity_unregister(disk);
4629 md_new_event(mddev);
4630 sysfs_notify_dirent(mddev->sysfs_state);
4635 static void autorun_array(mddev_t *mddev)
4640 if (list_empty(&mddev->disks))
4643 printk(KERN_INFO "md: running: ");
4645 list_for_each_entry(rdev, &mddev->disks, same_set) {
4646 char b[BDEVNAME_SIZE];
4647 printk("<%s>", bdevname(rdev->bdev,b));
4651 err = do_md_run(mddev);
4653 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
4654 do_md_stop(mddev, 0, 0);
4659 * lets try to run arrays based on all disks that have arrived
4660 * until now. (those are in pending_raid_disks)
4662 * the method: pick the first pending disk, collect all disks with
4663 * the same UUID, remove all from the pending list and put them into
4664 * the 'same_array' list. Then order this list based on superblock
4665 * update time (freshest comes first), kick out 'old' disks and
4666 * compare superblocks. If everything's fine then run it.
4668 * If "unit" is allocated, then bump its reference count
4670 static void autorun_devices(int part)
4672 mdk_rdev_t *rdev0, *rdev, *tmp;
4674 char b[BDEVNAME_SIZE];
4676 printk(KERN_INFO "md: autorun ...\n");
4677 while (!list_empty(&pending_raid_disks)) {
4680 LIST_HEAD(candidates);
4681 rdev0 = list_entry(pending_raid_disks.next,
4682 mdk_rdev_t, same_set);
4684 printk(KERN_INFO "md: considering %s ...\n",
4685 bdevname(rdev0->bdev,b));
4686 INIT_LIST_HEAD(&candidates);
4687 rdev_for_each_list(rdev, tmp, &pending_raid_disks)
4688 if (super_90_load(rdev, rdev0, 0) >= 0) {
4689 printk(KERN_INFO "md: adding %s ...\n",
4690 bdevname(rdev->bdev,b));
4691 list_move(&rdev->same_set, &candidates);
4694 * now we have a set of devices, with all of them having
4695 * mostly sane superblocks. It's time to allocate the
4699 dev = MKDEV(mdp_major,
4700 rdev0->preferred_minor << MdpMinorShift);
4701 unit = MINOR(dev) >> MdpMinorShift;
4703 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
4706 if (rdev0->preferred_minor != unit) {
4707 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
4708 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
4712 md_probe(dev, NULL, NULL);
4713 mddev = mddev_find(dev);
4714 if (!mddev || !mddev->gendisk) {
4718 "md: cannot allocate memory for md drive.\n");
4721 if (mddev_lock(mddev))
4722 printk(KERN_WARNING "md: %s locked, cannot run\n",
4724 else if (mddev->raid_disks || mddev->major_version
4725 || !list_empty(&mddev->disks)) {
4727 "md: %s already running, cannot run %s\n",
4728 mdname(mddev), bdevname(rdev0->bdev,b));
4729 mddev_unlock(mddev);
4731 printk(KERN_INFO "md: created %s\n", mdname(mddev));
4732 mddev->persistent = 1;
4733 rdev_for_each_list(rdev, tmp, &candidates) {
4734 list_del_init(&rdev->same_set);
4735 if (bind_rdev_to_array(rdev, mddev))
4738 autorun_array(mddev);
4739 mddev_unlock(mddev);
4741 /* on success, candidates will be empty, on error
4744 rdev_for_each_list(rdev, tmp, &candidates) {
4745 list_del_init(&rdev->same_set);
4750 printk(KERN_INFO "md: ... autorun DONE.\n");
4752 #endif /* !MODULE */
4754 static int get_version(void __user * arg)
4758 ver.major = MD_MAJOR_VERSION;
4759 ver.minor = MD_MINOR_VERSION;
4760 ver.patchlevel = MD_PATCHLEVEL_VERSION;
4762 if (copy_to_user(arg, &ver, sizeof(ver)))
4768 static int get_array_info(mddev_t * mddev, void __user * arg)
4770 mdu_array_info_t info;
4771 int nr,working,insync,failed,spare;
4774 nr=working=insync=failed=spare=0;
4775 list_for_each_entry(rdev, &mddev->disks, same_set) {
4777 if (test_bit(Faulty, &rdev->flags))
4781 if (test_bit(In_sync, &rdev->flags))
4788 info.major_version = mddev->major_version;
4789 info.minor_version = mddev->minor_version;
4790 info.patch_version = MD_PATCHLEVEL_VERSION;
4791 info.ctime = mddev->ctime;
4792 info.level = mddev->level;
4793 info.size = mddev->dev_sectors / 2;
4794 if (info.size != mddev->dev_sectors / 2) /* overflow */
4797 info.raid_disks = mddev->raid_disks;
4798 info.md_minor = mddev->md_minor;
4799 info.not_persistent= !mddev->persistent;
4801 info.utime = mddev->utime;
4804 info.state = (1<<MD_SB_CLEAN);
4805 if (mddev->bitmap && mddev->bitmap_info.offset)
4806 info.state = (1<<MD_SB_BITMAP_PRESENT);
4807 info.active_disks = insync;
4808 info.working_disks = working;
4809 info.failed_disks = failed;
4810 info.spare_disks = spare;
4812 info.layout = mddev->layout;
4813 info.chunk_size = mddev->chunk_sectors << 9;
4815 if (copy_to_user(arg, &info, sizeof(info)))
4821 static int get_bitmap_file(mddev_t * mddev, void __user * arg)
4823 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
4824 char *ptr, *buf = NULL;
4827 if (md_allow_write(mddev))
4828 file = kmalloc(sizeof(*file), GFP_NOIO);
4830 file = kmalloc(sizeof(*file), GFP_KERNEL);
4835 /* bitmap disabled, zero the first byte and copy out */
4836 if (!mddev->bitmap || !mddev->bitmap->file) {
4837 file->pathname[0] = '\0';
4841 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
4845 ptr = d_path(&mddev->bitmap->file->f_path, buf, sizeof(file->pathname));
4849 strcpy(file->pathname, ptr);
4853 if (copy_to_user(arg, file, sizeof(*file)))
4861 static int get_disk_info(mddev_t * mddev, void __user * arg)
4863 mdu_disk_info_t info;
4866 if (copy_from_user(&info, arg, sizeof(info)))
4869 rdev = find_rdev_nr(mddev, info.number);
4871 info.major = MAJOR(rdev->bdev->bd_dev);
4872 info.minor = MINOR(rdev->bdev->bd_dev);
4873 info.raid_disk = rdev->raid_disk;
4875 if (test_bit(Faulty, &rdev->flags))
4876 info.state |= (1<<MD_DISK_FAULTY);
4877 else if (test_bit(In_sync, &rdev->flags)) {
4878 info.state |= (1<<MD_DISK_ACTIVE);
4879 info.state |= (1<<MD_DISK_SYNC);
4881 if (test_bit(WriteMostly, &rdev->flags))
4882 info.state |= (1<<MD_DISK_WRITEMOSTLY);
4884 info.major = info.minor = 0;
4885 info.raid_disk = -1;
4886 info.state = (1<<MD_DISK_REMOVED);
4889 if (copy_to_user(arg, &info, sizeof(info)))
4895 static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
4897 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
4899 dev_t dev = MKDEV(info->major,info->minor);
4901 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
4904 if (!mddev->raid_disks) {
4906 /* expecting a device which has a superblock */
4907 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
4910 "md: md_import_device returned %ld\n",
4912 return PTR_ERR(rdev);
4914 if (!list_empty(&mddev->disks)) {
4915 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
4916 mdk_rdev_t, same_set);
4917 err = super_types[mddev->major_version]
4918 .load_super(rdev, rdev0, mddev->minor_version);
4921 "md: %s has different UUID to %s\n",
4922 bdevname(rdev->bdev,b),
4923 bdevname(rdev0->bdev,b2));
4928 err = bind_rdev_to_array(rdev, mddev);
4935 * add_new_disk can be used once the array is assembled
4936 * to add "hot spares". They must already have a superblock
4941 if (!mddev->pers->hot_add_disk) {
4943 "%s: personality does not support diskops!\n",
4947 if (mddev->persistent)
4948 rdev = md_import_device(dev, mddev->major_version,
4949 mddev->minor_version);
4951 rdev = md_import_device(dev, -1, -1);
4954 "md: md_import_device returned %ld\n",
4956 return PTR_ERR(rdev);
4958 /* set save_raid_disk if appropriate */
4959 if (!mddev->persistent) {
4960 if (info->state & (1<<MD_DISK_SYNC) &&
4961 info->raid_disk < mddev->raid_disks)
4962 rdev->raid_disk = info->raid_disk;
4964 rdev->raid_disk = -1;
4966 super_types[mddev->major_version].
4967 validate_super(mddev, rdev);
4968 rdev->saved_raid_disk = rdev->raid_disk;
4970 clear_bit(In_sync, &rdev->flags); /* just to be sure */
4971 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
4972 set_bit(WriteMostly, &rdev->flags);
4974 clear_bit(WriteMostly, &rdev->flags);
4976 rdev->raid_disk = -1;
4977 err = bind_rdev_to_array(rdev, mddev);
4978 if (!err && !mddev->pers->hot_remove_disk) {
4979 /* If there is hot_add_disk but no hot_remove_disk
4980 * then added disks for geometry changes,
4981 * and should be added immediately.
4983 super_types[mddev->major_version].
4984 validate_super(mddev, rdev);
4985 err = mddev->pers->hot_add_disk(mddev, rdev);
4987 unbind_rdev_from_array(rdev);
4992 sysfs_notify_dirent(rdev->sysfs_state);
4994 md_update_sb(mddev, 1);
4995 if (mddev->degraded)
4996 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
4997 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4998 md_wakeup_thread(mddev->thread);
5002 /* otherwise, add_new_disk is only allowed
5003 * for major_version==0 superblocks
5005 if (mddev->major_version != 0) {
5006 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
5011 if (!(info->state & (1<<MD_DISK_FAULTY))) {
5013 rdev = md_import_device(dev, -1, 0);
5016 "md: error, md_import_device() returned %ld\n",
5018 return PTR_ERR(rdev);
5020 rdev->desc_nr = info->number;
5021 if (info->raid_disk < mddev->raid_disks)
5022 rdev->raid_disk = info->raid_disk;
5024 rdev->raid_disk = -1;
5026 if (rdev->raid_disk < mddev->raid_disks)
5027 if (info->state & (1<<MD_DISK_SYNC))
5028 set_bit(In_sync, &rdev->flags);
5030 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
5031 set_bit(WriteMostly, &rdev->flags);
5033 if (!mddev->persistent) {
5034 printk(KERN_INFO "md: nonpersistent superblock ...\n");
5035 rdev->sb_start = rdev->bdev->bd_inode->i_size / 512;
5037 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
5038 rdev->sectors = rdev->sb_start;
5040 err = bind_rdev_to_array(rdev, mddev);
5050 static int hot_remove_disk(mddev_t * mddev, dev_t dev)
5052 char b[BDEVNAME_SIZE];
5055 rdev = find_rdev(mddev, dev);
5059 if (rdev->raid_disk >= 0)
5062 kick_rdev_from_array(rdev);
5063 md_update_sb(mddev, 1);
5064 md_new_event(mddev);
5068 printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n",
5069 bdevname(rdev->bdev,b), mdname(mddev));
5073 static int hot_add_disk(mddev_t * mddev, dev_t dev)
5075 char b[BDEVNAME_SIZE];
5082 if (mddev->major_version != 0) {
5083 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
5084 " version-0 superblocks.\n",
5088 if (!mddev->pers->hot_add_disk) {
5090 "%s: personality does not support diskops!\n",
5095 rdev = md_import_device(dev, -1, 0);
5098 "md: error, md_import_device() returned %ld\n",
5103 if (mddev->persistent)
5104 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
5106 rdev->sb_start = rdev->bdev->bd_inode->i_size / 512;
5108 rdev->sectors = rdev->sb_start;
5110 if (test_bit(Faulty, &rdev->flags)) {
5112 "md: can not hot-add faulty %s disk to %s!\n",
5113 bdevname(rdev->bdev,b), mdname(mddev));
5117 clear_bit(In_sync, &rdev->flags);
5119 rdev->saved_raid_disk = -1;
5120 err = bind_rdev_to_array(rdev, mddev);
5125 * The rest should better be atomic, we can have disk failures
5126 * noticed in interrupt contexts ...
5129 rdev->raid_disk = -1;
5131 md_update_sb(mddev, 1);
5134 * Kick recovery, maybe this spare has to be added to the
5135 * array immediately.
5137 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5138 md_wakeup_thread(mddev->thread);
5139 md_new_event(mddev);
5147 static int set_bitmap_file(mddev_t *mddev, int fd)
5152 if (!mddev->pers->quiesce)
5154 if (mddev->recovery || mddev->sync_thread)
5156 /* we should be able to change the bitmap.. */
5162 return -EEXIST; /* cannot add when bitmap is present */
5163 mddev->bitmap_info.file = fget(fd);
5165 if (mddev->bitmap_info.file == NULL) {
5166 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
5171 err = deny_bitmap_write_access(mddev->bitmap_info.file);
5173 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
5175 fput(mddev->bitmap_info.file);
5176 mddev->bitmap_info.file = NULL;
5179 mddev->bitmap_info.offset = 0; /* file overrides offset */
5180 } else if (mddev->bitmap == NULL)
5181 return -ENOENT; /* cannot remove what isn't there */
5184 mddev->pers->quiesce(mddev, 1);
5186 err = bitmap_create(mddev);
5187 if (fd < 0 || err) {
5188 bitmap_destroy(mddev);
5189 fd = -1; /* make sure to put the file */
5191 mddev->pers->quiesce(mddev, 0);
5194 if (mddev->bitmap_info.file) {
5195 restore_bitmap_write_access(mddev->bitmap_info.file);
5196 fput(mddev->bitmap_info.file);
5198 mddev->bitmap_info.file = NULL;
5205 * set_array_info is used two different ways
5206 * The original usage is when creating a new array.
5207 * In this usage, raid_disks is > 0 and it together with
5208 * level, size, not_persistent,layout,chunksize determine the
5209 * shape of the array.
5210 * This will always create an array with a type-0.90.0 superblock.
5211 * The newer usage is when assembling an array.
5212 * In this case raid_disks will be 0, and the major_version field is
5213 * use to determine which style super-blocks are to be found on the devices.
5214 * The minor and patch _version numbers are also kept incase the
5215 * super_block handler wishes to interpret them.
5217 static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
5220 if (info->raid_disks == 0) {
5221 /* just setting version number for superblock loading */
5222 if (info->major_version < 0 ||
5223 info->major_version >= ARRAY_SIZE(super_types) ||
5224 super_types[info->major_version].name == NULL) {
5225 /* maybe try to auto-load a module? */
5227 "md: superblock version %d not known\n",
5228 info->major_version);
5231 mddev->major_version = info->major_version;
5232 mddev->minor_version = info->minor_version;
5233 mddev->patch_version = info->patch_version;
5234 mddev->persistent = !info->not_persistent;
5237 mddev->major_version = MD_MAJOR_VERSION;
5238 mddev->minor_version = MD_MINOR_VERSION;
5239 mddev->patch_version = MD_PATCHLEVEL_VERSION;
5240 mddev->ctime = get_seconds();
5242 mddev->level = info->level;
5243 mddev->clevel[0] = 0;
5244 mddev->dev_sectors = 2 * (sector_t)info->size;
5245 mddev->raid_disks = info->raid_disks;
5246 /* don't set md_minor, it is determined by which /dev/md* was
5249 if (info->state & (1<<MD_SB_CLEAN))
5250 mddev->recovery_cp = MaxSector;
5252 mddev->recovery_cp = 0;
5253 mddev->persistent = ! info->not_persistent;
5254 mddev->external = 0;
5256 mddev->layout = info->layout;
5257 mddev->chunk_sectors = info->chunk_size >> 9;
5259 mddev->max_disks = MD_SB_DISKS;
5261 if (mddev->persistent)
5263 set_bit(MD_CHANGE_DEVS, &mddev->flags);
5265 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
5266 mddev->bitmap_info.offset = 0;
5268 mddev->reshape_position = MaxSector;
5271 * Generate a 128 bit UUID
5273 get_random_bytes(mddev->uuid, 16);
5275 mddev->new_level = mddev->level;
5276 mddev->new_chunk_sectors = mddev->chunk_sectors;
5277 mddev->new_layout = mddev->layout;
5278 mddev->delta_disks = 0;
5283 void md_set_array_sectors(mddev_t *mddev, sector_t array_sectors)
5285 WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__);
5287 if (mddev->external_size)
5290 mddev->array_sectors = array_sectors;
5292 EXPORT_SYMBOL(md_set_array_sectors);
5294 static int update_size(mddev_t *mddev, sector_t num_sectors)
5298 int fit = (num_sectors == 0);
5300 if (mddev->pers->resize == NULL)
5302 /* The "num_sectors" is the number of sectors of each device that
5303 * is used. This can only make sense for arrays with redundancy.
5304 * linear and raid0 always use whatever space is available. We can only
5305 * consider changing this number if no resync or reconstruction is
5306 * happening, and if the new size is acceptable. It must fit before the
5307 * sb_start or, if that is <data_offset, it must fit before the size
5308 * of each device. If num_sectors is zero, we find the largest size
5312 if (mddev->sync_thread)
5315 /* Sorry, cannot grow a bitmap yet, just remove it,
5319 list_for_each_entry(rdev, &mddev->disks, same_set) {
5320 sector_t avail = rdev->sectors;
5322 if (fit && (num_sectors == 0 || num_sectors > avail))
5323 num_sectors = avail;
5324 if (avail < num_sectors)
5327 rv = mddev->pers->resize(mddev, num_sectors);
5329 revalidate_disk(mddev->gendisk);
5333 static int update_raid_disks(mddev_t *mddev, int raid_disks)
5336 /* change the number of raid disks */
5337 if (mddev->pers->check_reshape == NULL)
5339 if (raid_disks <= 0 ||
5340 raid_disks >= mddev->max_disks)
5342 if (mddev->sync_thread || mddev->reshape_position != MaxSector)
5344 mddev->delta_disks = raid_disks - mddev->raid_disks;
5346 rv = mddev->pers->check_reshape(mddev);
5352 * update_array_info is used to change the configuration of an
5354 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
5355 * fields in the info are checked against the array.
5356 * Any differences that cannot be handled will cause an error.
5357 * Normally, only one change can be managed at a time.
5359 static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
5365 /* calculate expected state,ignoring low bits */
5366 if (mddev->bitmap && mddev->bitmap_info.offset)
5367 state |= (1 << MD_SB_BITMAP_PRESENT);
5369 if (mddev->major_version != info->major_version ||
5370 mddev->minor_version != info->minor_version ||
5371 /* mddev->patch_version != info->patch_version || */
5372 mddev->ctime != info->ctime ||
5373 mddev->level != info->level ||
5374 /* mddev->layout != info->layout || */
5375 !mddev->persistent != info->not_persistent||
5376 mddev->chunk_sectors != info->chunk_size >> 9 ||
5377 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
5378 ((state^info->state) & 0xfffffe00)
5381 /* Check there is only one change */
5382 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
5384 if (mddev->raid_disks != info->raid_disks)
5386 if (mddev->layout != info->layout)
5388 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT))
5395 if (mddev->layout != info->layout) {
5397 * we don't need to do anything at the md level, the
5398 * personality will take care of it all.
5400 if (mddev->pers->check_reshape == NULL)
5403 mddev->new_layout = info->layout;
5404 rv = mddev->pers->check_reshape(mddev);
5406 mddev->new_layout = mddev->layout;
5410 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
5411 rv = update_size(mddev, (sector_t)info->size * 2);
5413 if (mddev->raid_disks != info->raid_disks)
5414 rv = update_raid_disks(mddev, info->raid_disks);
5416 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
5417 if (mddev->pers->quiesce == NULL)
5419 if (mddev->recovery || mddev->sync_thread)
5421 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
5422 /* add the bitmap */
5425 if (mddev->bitmap_info.default_offset == 0)
5427 mddev->bitmap_info.offset =
5428 mddev->bitmap_info.default_offset;
5429 mddev->pers->quiesce(mddev, 1);
5430 rv = bitmap_create(mddev);
5432 bitmap_destroy(mddev);
5433 mddev->pers->quiesce(mddev, 0);
5435 /* remove the bitmap */
5438 if (mddev->bitmap->file)
5440 mddev->pers->quiesce(mddev, 1);
5441 bitmap_destroy(mddev);
5442 mddev->pers->quiesce(mddev, 0);
5443 mddev->bitmap_info.offset = 0;
5446 md_update_sb(mddev, 1);
5450 static int set_disk_faulty(mddev_t *mddev, dev_t dev)
5454 if (mddev->pers == NULL)
5457 rdev = find_rdev(mddev, dev);
5461 md_error(mddev, rdev);
5466 * We have a problem here : there is no easy way to give a CHS
5467 * virtual geometry. We currently pretend that we have a 2 heads
5468 * 4 sectors (with a BIG number of cylinders...). This drives
5469 * dosfs just mad... ;-)
5471 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
5473 mddev_t *mddev = bdev->bd_disk->private_data;
5477 geo->cylinders = get_capacity(mddev->gendisk) / 8;
5481 static int md_ioctl(struct block_device *bdev, fmode_t mode,
5482 unsigned int cmd, unsigned long arg)
5485 void __user *argp = (void __user *)arg;
5486 mddev_t *mddev = NULL;
5488 if (!capable(CAP_SYS_ADMIN))
5492 * Commands dealing with the RAID driver but not any
5498 err = get_version(argp);
5501 case PRINT_RAID_DEBUG:
5509 autostart_arrays(arg);
5516 * Commands creating/starting a new array:
5519 mddev = bdev->bd_disk->private_data;
5526 err = mddev_lock(mddev);
5529 "md: ioctl lock interrupted, reason %d, cmd %d\n",
5536 case SET_ARRAY_INFO:
5538 mdu_array_info_t info;
5540 memset(&info, 0, sizeof(info));
5541 else if (copy_from_user(&info, argp, sizeof(info))) {
5546 err = update_array_info(mddev, &info);
5548 printk(KERN_WARNING "md: couldn't update"
5549 " array info. %d\n", err);
5554 if (!list_empty(&mddev->disks)) {
5556 "md: array %s already has disks!\n",
5561 if (mddev->raid_disks) {
5563 "md: array %s already initialised!\n",
5568 err = set_array_info(mddev, &info);
5570 printk(KERN_WARNING "md: couldn't set"
5571 " array info. %d\n", err);
5581 * Commands querying/configuring an existing array:
5583 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
5584 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
5585 if ((!mddev->raid_disks && !mddev->external)
5586 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
5587 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
5588 && cmd != GET_BITMAP_FILE) {
5594 * Commands even a read-only array can execute:
5598 case GET_ARRAY_INFO:
5599 err = get_array_info(mddev, argp);
5602 case GET_BITMAP_FILE:
5603 err = get_bitmap_file(mddev, argp);
5607 err = get_disk_info(mddev, argp);
5610 case RESTART_ARRAY_RW:
5611 err = restart_array(mddev);
5615 err = do_md_stop(mddev, 0, 1);
5619 err = do_md_stop(mddev, 1, 1);
5625 * The remaining ioctls are changing the state of the
5626 * superblock, so we do not allow them on read-only arrays.
5627 * However non-MD ioctls (e.g. get-size) will still come through
5628 * here and hit the 'default' below, so only disallow
5629 * 'md' ioctls, and switch to rw mode if started auto-readonly.
5631 if (_IOC_TYPE(cmd) == MD_MAJOR && mddev->ro && mddev->pers) {
5632 if (mddev->ro == 2) {
5634 sysfs_notify_dirent(mddev->sysfs_state);
5635 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5636 md_wakeup_thread(mddev->thread);
5647 mdu_disk_info_t info;
5648 if (copy_from_user(&info, argp, sizeof(info)))
5651 err = add_new_disk(mddev, &info);
5655 case HOT_REMOVE_DISK:
5656 err = hot_remove_disk(mddev, new_decode_dev(arg));
5660 err = hot_add_disk(mddev, new_decode_dev(arg));
5663 case SET_DISK_FAULTY:
5664 err = set_disk_faulty(mddev, new_decode_dev(arg));
5668 err = do_md_run(mddev);
5671 case SET_BITMAP_FILE:
5672 err = set_bitmap_file(mddev, (int)arg);
5682 if (mddev->hold_active == UNTIL_IOCTL &&
5684 mddev->hold_active = 0;
5685 mddev_unlock(mddev);
5695 static int md_open(struct block_device *bdev, fmode_t mode)
5698 * Succeed if we can lock the mddev, which confirms that
5699 * it isn't being stopped right now.
5701 mddev_t *mddev = mddev_find(bdev->bd_dev);
5704 if (mddev->gendisk != bdev->bd_disk) {
5705 /* we are racing with mddev_put which is discarding this
5709 /* Wait until bdev->bd_disk is definitely gone */
5710 flush_scheduled_work();
5711 /* Then retry the open from the top */
5712 return -ERESTARTSYS;
5714 BUG_ON(mddev != bdev->bd_disk->private_data);
5716 if ((err = mutex_lock_interruptible(&mddev->open_mutex)))
5720 atomic_inc(&mddev->openers);
5721 mutex_unlock(&mddev->open_mutex);
5723 check_disk_change(bdev);
5728 static int md_release(struct gendisk *disk, fmode_t mode)
5730 mddev_t *mddev = disk->private_data;
5733 atomic_dec(&mddev->openers);
5739 static int md_media_changed(struct gendisk *disk)
5741 mddev_t *mddev = disk->private_data;
5743 return mddev->changed;
5746 static int md_revalidate(struct gendisk *disk)
5748 mddev_t *mddev = disk->private_data;
5753 static const struct block_device_operations md_fops =
5755 .owner = THIS_MODULE,
5757 .release = md_release,
5759 .getgeo = md_getgeo,
5760 .media_changed = md_media_changed,
5761 .revalidate_disk= md_revalidate,
5764 static int md_thread(void * arg)
5766 mdk_thread_t *thread = arg;
5769 * md_thread is a 'system-thread', it's priority should be very
5770 * high. We avoid resource deadlocks individually in each
5771 * raid personality. (RAID5 does preallocation) We also use RR and
5772 * the very same RT priority as kswapd, thus we will never get
5773 * into a priority inversion deadlock.
5775 * we definitely have to have equal or higher priority than
5776 * bdflush, otherwise bdflush will deadlock if there are too
5777 * many dirty RAID5 blocks.
5780 allow_signal(SIGKILL);
5781 while (!kthread_should_stop()) {
5783 /* We need to wait INTERRUPTIBLE so that
5784 * we don't add to the load-average.
5785 * That means we need to be sure no signals are
5788 if (signal_pending(current))
5789 flush_signals(current);
5791 wait_event_interruptible_timeout
5793 test_bit(THREAD_WAKEUP, &thread->flags)
5794 || kthread_should_stop(),
5797 clear_bit(THREAD_WAKEUP, &thread->flags);
5799 thread->run(thread->mddev);
5805 void md_wakeup_thread(mdk_thread_t *thread)
5808 dprintk("md: waking up MD thread %s.\n", thread->tsk->comm);
5809 set_bit(THREAD_WAKEUP, &thread->flags);
5810 wake_up(&thread->wqueue);
5814 mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
5817 mdk_thread_t *thread;
5819 thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL);
5823 init_waitqueue_head(&thread->wqueue);
5826 thread->mddev = mddev;
5827 thread->timeout = MAX_SCHEDULE_TIMEOUT;
5828 thread->tsk = kthread_run(md_thread, thread,
5830 mdname(thread->mddev),
5831 name ?: mddev->pers->name);
5832 if (IS_ERR(thread->tsk)) {
5839 void md_unregister_thread(mdk_thread_t *thread)
5843 dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
5845 kthread_stop(thread->tsk);
5849 void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
5856 if (!rdev || test_bit(Faulty, &rdev->flags))
5859 if (mddev->external)
5860 set_bit(Blocked, &rdev->flags);
5862 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
5864 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
5865 __builtin_return_address(0),__builtin_return_address(1),
5866 __builtin_return_address(2),__builtin_return_address(3));
5870 if (!mddev->pers->error_handler)
5872 mddev->pers->error_handler(mddev,rdev);
5873 if (mddev->degraded)
5874 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
5875 set_bit(StateChanged, &rdev->flags);
5876 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5877 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5878 md_wakeup_thread(mddev->thread);
5879 md_new_event_inintr(mddev);
5882 /* seq_file implementation /proc/mdstat */
5884 static void status_unused(struct seq_file *seq)
5889 seq_printf(seq, "unused devices: ");
5891 list_for_each_entry(rdev, &pending_raid_disks, same_set) {
5892 char b[BDEVNAME_SIZE];
5894 seq_printf(seq, "%s ",
5895 bdevname(rdev->bdev,b));
5898 seq_printf(seq, "<none>");
5900 seq_printf(seq, "\n");
5904 static void status_resync(struct seq_file *seq, mddev_t * mddev)
5906 sector_t max_sectors, resync, res;
5907 unsigned long dt, db;
5910 unsigned int per_milli;
5912 resync = mddev->curr_resync - atomic_read(&mddev->recovery_active);
5914 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
5915 max_sectors = mddev->resync_max_sectors;
5917 max_sectors = mddev->dev_sectors;
5920 * Should not happen.
5926 /* Pick 'scale' such that (resync>>scale)*1000 will fit
5927 * in a sector_t, and (max_sectors>>scale) will fit in a
5928 * u32, as those are the requirements for sector_div.
5929 * Thus 'scale' must be at least 10
5932 if (sizeof(sector_t) > sizeof(unsigned long)) {
5933 while ( max_sectors/2 > (1ULL<<(scale+32)))
5936 res = (resync>>scale)*1000;
5937 sector_div(res, (u32)((max_sectors>>scale)+1));
5941 int i, x = per_milli/50, y = 20-x;
5942 seq_printf(seq, "[");
5943 for (i = 0; i < x; i++)
5944 seq_printf(seq, "=");
5945 seq_printf(seq, ">");
5946 for (i = 0; i < y; i++)
5947 seq_printf(seq, ".");
5948 seq_printf(seq, "] ");
5950 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
5951 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
5953 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
5955 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
5956 "resync" : "recovery"))),
5957 per_milli/10, per_milli % 10,
5958 (unsigned long long) resync/2,
5959 (unsigned long long) max_sectors/2);
5962 * dt: time from mark until now
5963 * db: blocks written from mark until now
5964 * rt: remaining time
5966 * rt is a sector_t, so could be 32bit or 64bit.
5967 * So we divide before multiply in case it is 32bit and close
5969 * We scale the divisor (db) by 32 to avoid loosing precision
5970 * near the end of resync when the number of remaining sectors
5972 * We then divide rt by 32 after multiplying by db to compensate.
5973 * The '+1' avoids division by zero if db is very small.
5975 dt = ((jiffies - mddev->resync_mark) / HZ);
5977 db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active))
5978 - mddev->resync_mark_cnt;
5980 rt = max_sectors - resync; /* number of remaining sectors */
5981 sector_div(rt, db/32+1);
5985 seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60,
5986 ((unsigned long)rt % 60)/6);
5988 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
5991 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
5993 struct list_head *tmp;
6003 spin_lock(&all_mddevs_lock);
6004 list_for_each(tmp,&all_mddevs)
6006 mddev = list_entry(tmp, mddev_t, all_mddevs);
6008 spin_unlock(&all_mddevs_lock);
6011 spin_unlock(&all_mddevs_lock);
6013 return (void*)2;/* tail */
6017 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
6019 struct list_head *tmp;
6020 mddev_t *next_mddev, *mddev = v;
6026 spin_lock(&all_mddevs_lock);
6028 tmp = all_mddevs.next;
6030 tmp = mddev->all_mddevs.next;
6031 if (tmp != &all_mddevs)
6032 next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs));
6034 next_mddev = (void*)2;
6037 spin_unlock(&all_mddevs_lock);
6045 static void md_seq_stop(struct seq_file *seq, void *v)
6049 if (mddev && v != (void*)1 && v != (void*)2)
6053 struct mdstat_info {
6057 static int md_seq_show(struct seq_file *seq, void *v)
6062 struct mdstat_info *mi = seq->private;
6063 struct bitmap *bitmap;
6065 if (v == (void*)1) {
6066 struct mdk_personality *pers;
6067 seq_printf(seq, "Personalities : ");
6068 spin_lock(&pers_lock);
6069 list_for_each_entry(pers, &pers_list, list)
6070 seq_printf(seq, "[%s] ", pers->name);
6072 spin_unlock(&pers_lock);
6073 seq_printf(seq, "\n");
6074 mi->event = atomic_read(&md_event_count);
6077 if (v == (void*)2) {
6082 if (mddev_lock(mddev) < 0)
6085 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
6086 seq_printf(seq, "%s : %sactive", mdname(mddev),
6087 mddev->pers ? "" : "in");
6090 seq_printf(seq, " (read-only)");
6092 seq_printf(seq, " (auto-read-only)");
6093 seq_printf(seq, " %s", mddev->pers->name);
6097 list_for_each_entry(rdev, &mddev->disks, same_set) {
6098 char b[BDEVNAME_SIZE];
6099 seq_printf(seq, " %s[%d]",
6100 bdevname(rdev->bdev,b), rdev->desc_nr);
6101 if (test_bit(WriteMostly, &rdev->flags))
6102 seq_printf(seq, "(W)");
6103 if (test_bit(Faulty, &rdev->flags)) {
6104 seq_printf(seq, "(F)");
6106 } else if (rdev->raid_disk < 0)
6107 seq_printf(seq, "(S)"); /* spare */
6108 sectors += rdev->sectors;
6111 if (!list_empty(&mddev->disks)) {
6113 seq_printf(seq, "\n %llu blocks",
6114 (unsigned long long)
6115 mddev->array_sectors / 2);
6117 seq_printf(seq, "\n %llu blocks",
6118 (unsigned long long)sectors / 2);
6120 if (mddev->persistent) {
6121 if (mddev->major_version != 0 ||
6122 mddev->minor_version != 90) {
6123 seq_printf(seq," super %d.%d",
6124 mddev->major_version,
6125 mddev->minor_version);
6127 } else if (mddev->external)
6128 seq_printf(seq, " super external:%s",
6129 mddev->metadata_type);
6131 seq_printf(seq, " super non-persistent");
6134 mddev->pers->status(seq, mddev);
6135 seq_printf(seq, "\n ");
6136 if (mddev->pers->sync_request) {
6137 if (mddev->curr_resync > 2) {
6138 status_resync(seq, mddev);
6139 seq_printf(seq, "\n ");
6140 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
6141 seq_printf(seq, "\tresync=DELAYED\n ");
6142 else if (mddev->recovery_cp < MaxSector)
6143 seq_printf(seq, "\tresync=PENDING\n ");
6146 seq_printf(seq, "\n ");
6148 if ((bitmap = mddev->bitmap)) {
6149 unsigned long chunk_kb;
6150 unsigned long flags;
6151 spin_lock_irqsave(&bitmap->lock, flags);
6152 chunk_kb = mddev->bitmap_info.chunksize >> 10;
6153 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
6155 bitmap->pages - bitmap->missing_pages,
6157 (bitmap->pages - bitmap->missing_pages)
6158 << (PAGE_SHIFT - 10),
6159 chunk_kb ? chunk_kb : mddev->bitmap_info.chunksize,
6160 chunk_kb ? "KB" : "B");
6162 seq_printf(seq, ", file: ");
6163 seq_path(seq, &bitmap->file->f_path, " \t\n");
6166 seq_printf(seq, "\n");
6167 spin_unlock_irqrestore(&bitmap->lock, flags);
6170 seq_printf(seq, "\n");
6172 mddev_unlock(mddev);
6177 static const struct seq_operations md_seq_ops = {
6178 .start = md_seq_start,
6179 .next = md_seq_next,
6180 .stop = md_seq_stop,
6181 .show = md_seq_show,
6184 static int md_seq_open(struct inode *inode, struct file *file)
6187 struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL);
6191 error = seq_open(file, &md_seq_ops);
6195 struct seq_file *p = file->private_data;
6197 mi->event = atomic_read(&md_event_count);
6202 static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
6204 struct seq_file *m = filp->private_data;
6205 struct mdstat_info *mi = m->private;
6208 poll_wait(filp, &md_event_waiters, wait);
6210 /* always allow read */
6211 mask = POLLIN | POLLRDNORM;
6213 if (mi->event != atomic_read(&md_event_count))
6214 mask |= POLLERR | POLLPRI;
6218 static const struct file_operations md_seq_fops = {
6219 .owner = THIS_MODULE,
6220 .open = md_seq_open,
6222 .llseek = seq_lseek,
6223 .release = seq_release_private,
6224 .poll = mdstat_poll,
6227 int register_md_personality(struct mdk_personality *p)
6229 spin_lock(&pers_lock);
6230 list_add_tail(&p->list, &pers_list);
6231 printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level);
6232 spin_unlock(&pers_lock);
6236 int unregister_md_personality(struct mdk_personality *p)
6238 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
6239 spin_lock(&pers_lock);
6240 list_del_init(&p->list);
6241 spin_unlock(&pers_lock);
6245 static int is_mddev_idle(mddev_t *mddev, int init)
6253 rdev_for_each_rcu(rdev, mddev) {
6254 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
6255 curr_events = (int)part_stat_read(&disk->part0, sectors[0]) +
6256 (int)part_stat_read(&disk->part0, sectors[1]) -
6257 atomic_read(&disk->sync_io);
6258 /* sync IO will cause sync_io to increase before the disk_stats
6259 * as sync_io is counted when a request starts, and
6260 * disk_stats is counted when it completes.
6261 * So resync activity will cause curr_events to be smaller than
6262 * when there was no such activity.
6263 * non-sync IO will cause disk_stat to increase without
6264 * increasing sync_io so curr_events will (eventually)
6265 * be larger than it was before. Once it becomes
6266 * substantially larger, the test below will cause
6267 * the array to appear non-idle, and resync will slow
6269 * If there is a lot of outstanding resync activity when
6270 * we set last_event to curr_events, then all that activity
6271 * completing might cause the array to appear non-idle
6272 * and resync will be slowed down even though there might
6273 * not have been non-resync activity. This will only
6274 * happen once though. 'last_events' will soon reflect
6275 * the state where there is little or no outstanding
6276 * resync requests, and further resync activity will
6277 * always make curr_events less than last_events.
6280 if (init || curr_events - rdev->last_events > 64) {
6281 rdev->last_events = curr_events;
6289 void md_done_sync(mddev_t *mddev, int blocks, int ok)
6291 /* another "blocks" (512byte) blocks have been synced */
6292 atomic_sub(blocks, &mddev->recovery_active);
6293 wake_up(&mddev->recovery_wait);
6295 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6296 md_wakeup_thread(mddev->thread);
6297 // stop recovery, signal do_sync ....
6302 /* md_write_start(mddev, bi)
6303 * If we need to update some array metadata (e.g. 'active' flag
6304 * in superblock) before writing, schedule a superblock update
6305 * and wait for it to complete.
6307 void md_write_start(mddev_t *mddev, struct bio *bi)
6310 if (bio_data_dir(bi) != WRITE)
6313 BUG_ON(mddev->ro == 1);
6314 if (mddev->ro == 2) {
6315 /* need to switch to read/write */
6317 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6318 md_wakeup_thread(mddev->thread);
6319 md_wakeup_thread(mddev->sync_thread);
6322 atomic_inc(&mddev->writes_pending);
6323 if (mddev->safemode == 1)
6324 mddev->safemode = 0;
6325 if (mddev->in_sync) {
6326 spin_lock_irq(&mddev->write_lock);
6327 if (mddev->in_sync) {
6329 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6330 md_wakeup_thread(mddev->thread);
6333 spin_unlock_irq(&mddev->write_lock);
6336 sysfs_notify_dirent(mddev->sysfs_state);
6337 wait_event(mddev->sb_wait,
6338 !test_bit(MD_CHANGE_CLEAN, &mddev->flags) &&
6339 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
6342 void md_write_end(mddev_t *mddev)
6344 if (atomic_dec_and_test(&mddev->writes_pending)) {
6345 if (mddev->safemode == 2)
6346 md_wakeup_thread(mddev->thread);
6347 else if (mddev->safemode_delay)
6348 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
6352 /* md_allow_write(mddev)
6353 * Calling this ensures that the array is marked 'active' so that writes
6354 * may proceed without blocking. It is important to call this before
6355 * attempting a GFP_KERNEL allocation while holding the mddev lock.
6356 * Must be called with mddev_lock held.
6358 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
6359 * is dropped, so return -EAGAIN after notifying userspace.
6361 int md_allow_write(mddev_t *mddev)
6367 if (!mddev->pers->sync_request)
6370 spin_lock_irq(&mddev->write_lock);
6371 if (mddev->in_sync) {
6373 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6374 if (mddev->safemode_delay &&
6375 mddev->safemode == 0)
6376 mddev->safemode = 1;
6377 spin_unlock_irq(&mddev->write_lock);
6378 md_update_sb(mddev, 0);
6379 sysfs_notify_dirent(mddev->sysfs_state);
6381 spin_unlock_irq(&mddev->write_lock);
6383 if (test_bit(MD_CHANGE_CLEAN, &mddev->flags))
6388 EXPORT_SYMBOL_GPL(md_allow_write);
6390 #define SYNC_MARKS 10
6391 #define SYNC_MARK_STEP (3*HZ)
6392 void md_do_sync(mddev_t *mddev)
6395 unsigned int currspeed = 0,
6397 sector_t max_sectors,j, io_sectors;
6398 unsigned long mark[SYNC_MARKS];
6399 sector_t mark_cnt[SYNC_MARKS];
6401 struct list_head *tmp;
6402 sector_t last_check;
6407 /* just incase thread restarts... */
6408 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
6410 if (mddev->ro) /* never try to sync a read-only array */
6413 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
6414 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
6415 desc = "data-check";
6416 else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
6417 desc = "requested-resync";
6420 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
6425 /* we overload curr_resync somewhat here.
6426 * 0 == not engaged in resync at all
6427 * 2 == checking that there is no conflict with another sync
6428 * 1 == like 2, but have yielded to allow conflicting resync to
6430 * other == active in resync - this many blocks
6432 * Before starting a resync we must have set curr_resync to
6433 * 2, and then checked that every "conflicting" array has curr_resync
6434 * less than ours. When we find one that is the same or higher
6435 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
6436 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
6437 * This will mean we have to start checking from the beginning again.
6442 mddev->curr_resync = 2;
6445 if (kthread_should_stop()) {
6446 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6449 for_each_mddev(mddev2, tmp) {
6450 if (mddev2 == mddev)
6452 if (!mddev->parallel_resync
6453 && mddev2->curr_resync
6454 && match_mddev_units(mddev, mddev2)) {
6456 if (mddev < mddev2 && mddev->curr_resync == 2) {
6457 /* arbitrarily yield */
6458 mddev->curr_resync = 1;
6459 wake_up(&resync_wait);
6461 if (mddev > mddev2 && mddev->curr_resync == 1)
6462 /* no need to wait here, we can wait the next
6463 * time 'round when curr_resync == 2
6466 /* We need to wait 'interruptible' so as not to
6467 * contribute to the load average, and not to
6468 * be caught by 'softlockup'
6470 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
6471 if (!kthread_should_stop() &&
6472 mddev2->curr_resync >= mddev->curr_resync) {
6473 printk(KERN_INFO "md: delaying %s of %s"
6474 " until %s has finished (they"
6475 " share one or more physical units)\n",
6476 desc, mdname(mddev), mdname(mddev2));
6478 if (signal_pending(current))
6479 flush_signals(current);
6481 finish_wait(&resync_wait, &wq);
6484 finish_wait(&resync_wait, &wq);
6487 } while (mddev->curr_resync < 2);
6490 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
6491 /* resync follows the size requested by the personality,
6492 * which defaults to physical size, but can be virtual size
6494 max_sectors = mddev->resync_max_sectors;
6495 mddev->resync_mismatches = 0;
6496 /* we don't use the checkpoint if there's a bitmap */
6497 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
6498 j = mddev->resync_min;
6499 else if (!mddev->bitmap)
6500 j = mddev->recovery_cp;
6502 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
6503 max_sectors = mddev->dev_sectors;
6505 /* recovery follows the physical size of devices */
6506 max_sectors = mddev->dev_sectors;
6508 list_for_each_entry(rdev, &mddev->disks, same_set)
6509 if (rdev->raid_disk >= 0 &&
6510 !test_bit(Faulty, &rdev->flags) &&
6511 !test_bit(In_sync, &rdev->flags) &&
6512 rdev->recovery_offset < j)
6513 j = rdev->recovery_offset;
6516 printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev));
6517 printk(KERN_INFO "md: minimum _guaranteed_ speed:"
6518 " %d KB/sec/disk.\n", speed_min(mddev));
6519 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
6520 "(but not more than %d KB/sec) for %s.\n",
6521 speed_max(mddev), desc);
6523 is_mddev_idle(mddev, 1); /* this initializes IO event counters */
6526 for (m = 0; m < SYNC_MARKS; m++) {
6528 mark_cnt[m] = io_sectors;
6531 mddev->resync_mark = mark[last_mark];
6532 mddev->resync_mark_cnt = mark_cnt[last_mark];
6535 * Tune reconstruction:
6537 window = 32*(PAGE_SIZE/512);
6538 printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n",
6539 window/2,(unsigned long long) max_sectors/2);
6541 atomic_set(&mddev->recovery_active, 0);
6546 "md: resuming %s of %s from checkpoint.\n",
6547 desc, mdname(mddev));
6548 mddev->curr_resync = j;
6550 mddev->curr_resync_completed = mddev->curr_resync;
6552 while (j < max_sectors) {
6557 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
6558 ((mddev->curr_resync > mddev->curr_resync_completed &&
6559 (mddev->curr_resync - mddev->curr_resync_completed)
6560 > (max_sectors >> 4)) ||
6561 (j - mddev->curr_resync_completed)*2
6562 >= mddev->resync_max - mddev->curr_resync_completed
6564 /* time to update curr_resync_completed */
6565 blk_unplug(mddev->queue);
6566 wait_event(mddev->recovery_wait,
6567 atomic_read(&mddev->recovery_active) == 0);
6568 mddev->curr_resync_completed =
6570 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6571 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
6574 while (j >= mddev->resync_max && !kthread_should_stop()) {
6575 /* As this condition is controlled by user-space,
6576 * we can block indefinitely, so use '_interruptible'
6577 * to avoid triggering warnings.
6579 flush_signals(current); /* just in case */
6580 wait_event_interruptible(mddev->recovery_wait,
6581 mddev->resync_max > j
6582 || kthread_should_stop());
6585 if (kthread_should_stop())
6588 sectors = mddev->pers->sync_request(mddev, j, &skipped,
6589 currspeed < speed_min(mddev));
6591 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6595 if (!skipped) { /* actual IO requested */
6596 io_sectors += sectors;
6597 atomic_add(sectors, &mddev->recovery_active);
6601 if (j>1) mddev->curr_resync = j;
6602 mddev->curr_mark_cnt = io_sectors;
6603 if (last_check == 0)
6604 /* this is the earliers that rebuilt will be
6605 * visible in /proc/mdstat
6607 md_new_event(mddev);
6609 if (last_check + window > io_sectors || j == max_sectors)
6612 last_check = io_sectors;
6614 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
6618 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
6620 int next = (last_mark+1) % SYNC_MARKS;
6622 mddev->resync_mark = mark[next];
6623 mddev->resync_mark_cnt = mark_cnt[next];
6624 mark[next] = jiffies;
6625 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
6630 if (kthread_should_stop())
6635 * this loop exits only if either when we are slower than
6636 * the 'hard' speed limit, or the system was IO-idle for
6638 * the system might be non-idle CPU-wise, but we only care
6639 * about not overloading the IO subsystem. (things like an
6640 * e2fsck being done on the RAID array should execute fast)
6642 blk_unplug(mddev->queue);
6645 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
6646 /((jiffies-mddev->resync_mark)/HZ +1) +1;
6648 if (currspeed > speed_min(mddev)) {
6649 if ((currspeed > speed_max(mddev)) ||
6650 !is_mddev_idle(mddev, 0)) {
6656 printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc);
6658 * this also signals 'finished resyncing' to md_stop
6661 blk_unplug(mddev->queue);
6663 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
6665 /* tell personality that we are finished */
6666 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
6668 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
6669 mddev->curr_resync > 2) {
6670 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
6671 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
6672 if (mddev->curr_resync >= mddev->recovery_cp) {
6674 "md: checkpointing %s of %s.\n",
6675 desc, mdname(mddev));
6676 mddev->recovery_cp = mddev->curr_resync;
6679 mddev->recovery_cp = MaxSector;
6681 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
6682 mddev->curr_resync = MaxSector;
6683 list_for_each_entry(rdev, &mddev->disks, same_set)
6684 if (rdev->raid_disk >= 0 &&
6685 !test_bit(Faulty, &rdev->flags) &&
6686 !test_bit(In_sync, &rdev->flags) &&
6687 rdev->recovery_offset < mddev->curr_resync)
6688 rdev->recovery_offset = mddev->curr_resync;
6691 set_bit(MD_CHANGE_DEVS, &mddev->flags);
6694 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
6695 /* We completed so min/max setting can be forgotten if used. */
6696 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
6697 mddev->resync_min = 0;
6698 mddev->resync_max = MaxSector;
6699 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
6700 mddev->resync_min = mddev->curr_resync_completed;
6701 mddev->curr_resync = 0;
6702 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
6703 mddev->curr_resync_completed = 0;
6704 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
6705 wake_up(&resync_wait);
6706 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
6707 md_wakeup_thread(mddev->thread);
6712 * got a signal, exit.
6715 "md: md_do_sync() got signal ... exiting\n");
6716 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6720 EXPORT_SYMBOL_GPL(md_do_sync);
6723 static int remove_and_add_spares(mddev_t *mddev)
6728 mddev->curr_resync_completed = 0;
6730 list_for_each_entry(rdev, &mddev->disks, same_set)
6731 if (rdev->raid_disk >= 0 &&
6732 !test_bit(Blocked, &rdev->flags) &&
6733 (test_bit(Faulty, &rdev->flags) ||
6734 ! test_bit(In_sync, &rdev->flags)) &&
6735 atomic_read(&rdev->nr_pending)==0) {
6736 if (mddev->pers->hot_remove_disk(
6737 mddev, rdev->raid_disk)==0) {
6739 sprintf(nm,"rd%d", rdev->raid_disk);
6740 sysfs_remove_link(&mddev->kobj, nm);
6741 rdev->raid_disk = -1;
6745 if (mddev->degraded && ! mddev->ro && !mddev->recovery_disabled) {
6746 list_for_each_entry(rdev, &mddev->disks, same_set) {
6747 if (rdev->raid_disk >= 0 &&
6748 !test_bit(In_sync, &rdev->flags) &&
6749 !test_bit(Blocked, &rdev->flags))
6751 if (rdev->raid_disk < 0
6752 && !test_bit(Faulty, &rdev->flags)) {
6753 rdev->recovery_offset = 0;
6755 hot_add_disk(mddev, rdev) == 0) {
6757 sprintf(nm, "rd%d", rdev->raid_disk);
6758 if (sysfs_create_link(&mddev->kobj,
6761 "md: cannot register "
6765 md_new_event(mddev);
6774 * This routine is regularly called by all per-raid-array threads to
6775 * deal with generic issues like resync and super-block update.
6776 * Raid personalities that don't have a thread (linear/raid0) do not
6777 * need this as they never do any recovery or update the superblock.
6779 * It does not do any resync itself, but rather "forks" off other threads
6780 * to do that as needed.
6781 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
6782 * "->recovery" and create a thread at ->sync_thread.
6783 * When the thread finishes it sets MD_RECOVERY_DONE
6784 * and wakeups up this thread which will reap the thread and finish up.
6785 * This thread also removes any faulty devices (with nr_pending == 0).
6787 * The overall approach is:
6788 * 1/ if the superblock needs updating, update it.
6789 * 2/ If a recovery thread is running, don't do anything else.
6790 * 3/ If recovery has finished, clean up, possibly marking spares active.
6791 * 4/ If there are any faulty devices, remove them.
6792 * 5/ If array is degraded, try to add spares devices
6793 * 6/ If array has spares or is not in-sync, start a resync thread.
6795 void md_check_recovery(mddev_t *mddev)
6801 bitmap_daemon_work(mddev);
6806 if (signal_pending(current)) {
6807 if (mddev->pers->sync_request && !mddev->external) {
6808 printk(KERN_INFO "md: %s in immediate safe mode\n",
6810 mddev->safemode = 2;
6812 flush_signals(current);
6815 if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
6818 (mddev->flags && !mddev->external) ||
6819 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
6820 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
6821 (mddev->external == 0 && mddev->safemode == 1) ||
6822 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
6823 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
6827 if (mddev_trylock(mddev)) {
6831 /* Only thing we do on a ro array is remove
6834 remove_and_add_spares(mddev);
6835 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6839 if (!mddev->external) {
6841 spin_lock_irq(&mddev->write_lock);
6842 if (mddev->safemode &&
6843 !atomic_read(&mddev->writes_pending) &&
6845 mddev->recovery_cp == MaxSector) {
6848 if (mddev->persistent)
6849 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6851 if (mddev->safemode == 1)
6852 mddev->safemode = 0;
6853 spin_unlock_irq(&mddev->write_lock);
6855 sysfs_notify_dirent(mddev->sysfs_state);
6859 md_update_sb(mddev, 0);
6861 list_for_each_entry(rdev, &mddev->disks, same_set)
6862 if (test_and_clear_bit(StateChanged, &rdev->flags))
6863 sysfs_notify_dirent(rdev->sysfs_state);
6866 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
6867 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
6868 /* resync/recovery still happening */
6869 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6872 if (mddev->sync_thread) {
6873 /* resync has finished, collect result */
6874 md_unregister_thread(mddev->sync_thread);
6875 mddev->sync_thread = NULL;
6876 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
6877 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
6879 /* activate any spares */
6880 if (mddev->pers->spare_active(mddev))
6881 sysfs_notify(&mddev->kobj, NULL,
6884 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
6885 mddev->pers->finish_reshape)
6886 mddev->pers->finish_reshape(mddev);
6887 md_update_sb(mddev, 1);
6889 /* if array is no-longer degraded, then any saved_raid_disk
6890 * information must be scrapped
6892 if (!mddev->degraded)
6893 list_for_each_entry(rdev, &mddev->disks, same_set)
6894 rdev->saved_raid_disk = -1;
6896 mddev->recovery = 0;
6897 /* flag recovery needed just to double check */
6898 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6899 sysfs_notify_dirent(mddev->sysfs_action);
6900 md_new_event(mddev);
6903 /* Set RUNNING before clearing NEEDED to avoid
6904 * any transients in the value of "sync_action".
6906 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
6907 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6908 /* Clear some bits that don't mean anything, but
6911 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
6912 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
6914 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
6916 /* no recovery is running.
6917 * remove any failed drives, then
6918 * add spares if possible.
6919 * Spare are also removed and re-added, to allow
6920 * the personality to fail the re-add.
6923 if (mddev->reshape_position != MaxSector) {
6924 if (mddev->pers->check_reshape == NULL ||
6925 mddev->pers->check_reshape(mddev) != 0)
6926 /* Cannot proceed */
6928 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
6929 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6930 } else if ((spares = remove_and_add_spares(mddev))) {
6931 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
6932 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
6933 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
6934 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6935 } else if (mddev->recovery_cp < MaxSector) {
6936 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
6937 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6938 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
6939 /* nothing to be done ... */
6942 if (mddev->pers->sync_request) {
6943 if (spares && mddev->bitmap && ! mddev->bitmap->file) {
6944 /* We are adding a device or devices to an array
6945 * which has the bitmap stored on all devices.
6946 * So make sure all bitmap pages get written
6948 bitmap_write_all(mddev->bitmap);
6950 mddev->sync_thread = md_register_thread(md_do_sync,
6953 if (!mddev->sync_thread) {
6954 printk(KERN_ERR "%s: could not start resync"
6957 /* leave the spares where they are, it shouldn't hurt */
6958 mddev->recovery = 0;
6960 md_wakeup_thread(mddev->sync_thread);
6961 sysfs_notify_dirent(mddev->sysfs_action);
6962 md_new_event(mddev);
6965 if (!mddev->sync_thread) {
6966 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
6967 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
6969 if (mddev->sysfs_action)
6970 sysfs_notify_dirent(mddev->sysfs_action);
6972 mddev_unlock(mddev);
6976 void md_wait_for_blocked_rdev(mdk_rdev_t *rdev, mddev_t *mddev)
6978 sysfs_notify_dirent(rdev->sysfs_state);
6979 wait_event_timeout(rdev->blocked_wait,
6980 !test_bit(Blocked, &rdev->flags),
6981 msecs_to_jiffies(5000));
6982 rdev_dec_pending(rdev, mddev);
6984 EXPORT_SYMBOL(md_wait_for_blocked_rdev);
6986 static int md_notify_reboot(struct notifier_block *this,
6987 unsigned long code, void *x)
6989 struct list_head *tmp;
6992 if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) {
6994 printk(KERN_INFO "md: stopping all md devices.\n");
6996 for_each_mddev(mddev, tmp)
6997 if (mddev_trylock(mddev)) {
6998 /* Force a switch to readonly even array
6999 * appears to still be in use. Hence
7002 do_md_stop(mddev, 1, 100);
7003 mddev_unlock(mddev);
7006 * certain more exotic SCSI devices are known to be
7007 * volatile wrt too early system reboots. While the
7008 * right place to handle this issue is the given
7009 * driver, we do want to have a safe RAID driver ...
7016 static struct notifier_block md_notifier = {
7017 .notifier_call = md_notify_reboot,
7019 .priority = INT_MAX, /* before any real devices */
7022 static void md_geninit(void)
7024 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
7026 proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops);
7029 static int __init md_init(void)
7031 if (register_blkdev(MD_MAJOR, "md"))
7033 if ((mdp_major=register_blkdev(0, "mdp"))<=0) {
7034 unregister_blkdev(MD_MAJOR, "md");
7037 blk_register_region(MKDEV(MD_MAJOR, 0), 1UL<<MINORBITS, THIS_MODULE,
7038 md_probe, NULL, NULL);
7039 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
7040 md_probe, NULL, NULL);
7042 register_reboot_notifier(&md_notifier);
7043 raid_table_header = register_sysctl_table(raid_root_table);
7053 * Searches all registered partitions for autorun RAID arrays
7057 static LIST_HEAD(all_detected_devices);
7058 struct detected_devices_node {
7059 struct list_head list;
7063 void md_autodetect_dev(dev_t dev)
7065 struct detected_devices_node *node_detected_dev;
7067 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
7068 if (node_detected_dev) {
7069 node_detected_dev->dev = dev;
7070 list_add_tail(&node_detected_dev->list, &all_detected_devices);
7072 printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed"
7073 ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev));
7078 static void autostart_arrays(int part)
7081 struct detected_devices_node *node_detected_dev;
7083 int i_scanned, i_passed;
7088 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
7090 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
7092 node_detected_dev = list_entry(all_detected_devices.next,
7093 struct detected_devices_node, list);
7094 list_del(&node_detected_dev->list);
7095 dev = node_detected_dev->dev;
7096 kfree(node_detected_dev);
7097 rdev = md_import_device(dev,0, 90);
7101 if (test_bit(Faulty, &rdev->flags)) {
7105 set_bit(AutoDetected, &rdev->flags);
7106 list_add(&rdev->same_set, &pending_raid_disks);
7110 printk(KERN_INFO "md: Scanned %d and added %d devices.\n",
7111 i_scanned, i_passed);
7113 autorun_devices(part);
7116 #endif /* !MODULE */
7118 static __exit void md_exit(void)
7121 struct list_head *tmp;
7123 blk_unregister_region(MKDEV(MD_MAJOR,0), 1U << MINORBITS);
7124 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
7126 unregister_blkdev(MD_MAJOR,"md");
7127 unregister_blkdev(mdp_major, "mdp");
7128 unregister_reboot_notifier(&md_notifier);
7129 unregister_sysctl_table(raid_table_header);
7130 remove_proc_entry("mdstat", NULL);
7131 for_each_mddev(mddev, tmp) {
7132 export_array(mddev);
7133 mddev->hold_active = 0;
7137 subsys_initcall(md_init);
7138 module_exit(md_exit)
7140 static int get_ro(char *buffer, struct kernel_param *kp)
7142 return sprintf(buffer, "%d", start_readonly);
7144 static int set_ro(const char *val, struct kernel_param *kp)
7147 int num = simple_strtoul(val, &e, 10);
7148 if (*val && (*e == '\0' || *e == '\n')) {
7149 start_readonly = num;
7155 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
7156 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
7158 module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR);
7160 EXPORT_SYMBOL(register_md_personality);
7161 EXPORT_SYMBOL(unregister_md_personality);
7162 EXPORT_SYMBOL(md_error);
7163 EXPORT_SYMBOL(md_done_sync);
7164 EXPORT_SYMBOL(md_write_start);
7165 EXPORT_SYMBOL(md_write_end);
7166 EXPORT_SYMBOL(md_register_thread);
7167 EXPORT_SYMBOL(md_unregister_thread);
7168 EXPORT_SYMBOL(md_wakeup_thread);
7169 EXPORT_SYMBOL(md_check_recovery);
7170 MODULE_LICENSE("GPL");
7172 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);