2 md.c : Multiple Devices driver for Linux
3 Copyright (C) 1998, 1999, 2000 Ingo Molnar
5 completely rewritten, based on the MD driver code from Marc Zyngier
9 - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar
10 - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com>
11 - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net>
12 - kerneld support by Boris Tobotras <boris@xtalk.msk.su>
13 - kmod support by: Cyrus Durgin
14 - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com>
15 - Devfs support by Richard Gooch <rgooch@atnf.csiro.au>
17 - lots of fixes and improvements to the RAID1/RAID5 and generic
18 RAID code (such as request based resynchronization):
20 Neil Brown <neilb@cse.unsw.edu.au>.
22 - persistent bitmap code
23 Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.
25 This program is free software; you can redistribute it and/or modify
26 it under the terms of the GNU General Public License as published by
27 the Free Software Foundation; either version 2, or (at your option)
30 You should have received a copy of the GNU General Public License
31 (for example /usr/src/linux/COPYING); if not, write to the Free
32 Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
35 #include <linux/kthread.h>
36 #include <linux/blkdev.h>
37 #include <linux/sysctl.h>
38 #include <linux/seq_file.h>
39 #include <linux/mutex.h>
40 #include <linux/buffer_head.h> /* for invalidate_bdev */
41 #include <linux/poll.h>
42 #include <linux/ctype.h>
43 #include <linux/string.h>
44 #include <linux/hdreg.h>
45 #include <linux/proc_fs.h>
46 #include <linux/random.h>
47 #include <linux/reboot.h>
48 #include <linux/file.h>
49 #include <linux/compat.h>
50 #include <linux/delay.h>
51 #include <linux/raid/md_p.h>
52 #include <linux/raid/md_u.h>
53 #include <linux/slab.h>
58 #define dprintk(x...) ((void)(DEBUG && printk(x)))
61 static void autostart_arrays(int part);
64 static LIST_HEAD(pers_list);
65 static DEFINE_SPINLOCK(pers_lock);
67 static void md_print_devices(void);
69 static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
70 static struct workqueue_struct *md_wq;
71 static struct workqueue_struct *md_misc_wq;
73 #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
76 * Default number of read corrections we'll attempt on an rdev
77 * before ejecting it from the array. We divide the read error
78 * count by 2 for every hour elapsed between read errors.
80 #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
82 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
83 * is 1000 KB/sec, so the extra system load does not show up that much.
84 * Increase it if you want to have more _guaranteed_ speed. Note that
85 * the RAID driver will use the maximum available bandwidth if the IO
86 * subsystem is idle. There is also an 'absolute maximum' reconstruction
87 * speed limit - in case reconstruction slows down your system despite
90 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
91 * or /sys/block/mdX/md/sync_speed_{min,max}
94 static int sysctl_speed_limit_min = 1000;
95 static int sysctl_speed_limit_max = 200000;
96 static inline int speed_min(mddev_t *mddev)
98 return mddev->sync_speed_min ?
99 mddev->sync_speed_min : sysctl_speed_limit_min;
102 static inline int speed_max(mddev_t *mddev)
104 return mddev->sync_speed_max ?
105 mddev->sync_speed_max : sysctl_speed_limit_max;
108 static struct ctl_table_header *raid_table_header;
110 static ctl_table raid_table[] = {
112 .procname = "speed_limit_min",
113 .data = &sysctl_speed_limit_min,
114 .maxlen = sizeof(int),
115 .mode = S_IRUGO|S_IWUSR,
116 .proc_handler = proc_dointvec,
119 .procname = "speed_limit_max",
120 .data = &sysctl_speed_limit_max,
121 .maxlen = sizeof(int),
122 .mode = S_IRUGO|S_IWUSR,
123 .proc_handler = proc_dointvec,
128 static ctl_table raid_dir_table[] = {
132 .mode = S_IRUGO|S_IXUGO,
138 static ctl_table raid_root_table[] = {
143 .child = raid_dir_table,
148 static const struct block_device_operations md_fops;
150 static int start_readonly;
153 * like bio_clone, but with a local bio set
156 static void mddev_bio_destructor(struct bio *bio)
158 mddev_t *mddev, **mddevp;
163 bio_free(bio, mddev->bio_set);
166 struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs,
172 if (!mddev || !mddev->bio_set)
173 return bio_alloc(gfp_mask, nr_iovecs);
175 b = bio_alloc_bioset(gfp_mask, nr_iovecs,
181 b->bi_destructor = mddev_bio_destructor;
184 EXPORT_SYMBOL_GPL(bio_alloc_mddev);
186 struct bio *bio_clone_mddev(struct bio *bio, gfp_t gfp_mask,
192 if (!mddev || !mddev->bio_set)
193 return bio_clone(bio, gfp_mask);
195 b = bio_alloc_bioset(gfp_mask, bio->bi_max_vecs,
201 b->bi_destructor = mddev_bio_destructor;
203 if (bio_integrity(bio)) {
206 ret = bio_integrity_clone(b, bio, gfp_mask, mddev->bio_set);
216 EXPORT_SYMBOL_GPL(bio_clone_mddev);
219 * We have a system wide 'event count' that is incremented
220 * on any 'interesting' event, and readers of /proc/mdstat
221 * can use 'poll' or 'select' to find out when the event
225 * start array, stop array, error, add device, remove device,
226 * start build, activate spare
228 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
229 static atomic_t md_event_count;
230 void md_new_event(mddev_t *mddev)
232 atomic_inc(&md_event_count);
233 wake_up(&md_event_waiters);
235 EXPORT_SYMBOL_GPL(md_new_event);
237 /* Alternate version that can be called from interrupts
238 * when calling sysfs_notify isn't needed.
240 static void md_new_event_inintr(mddev_t *mddev)
242 atomic_inc(&md_event_count);
243 wake_up(&md_event_waiters);
247 * Enables to iterate over all existing md arrays
248 * all_mddevs_lock protects this list.
250 static LIST_HEAD(all_mddevs);
251 static DEFINE_SPINLOCK(all_mddevs_lock);
255 * iterates through all used mddevs in the system.
256 * We take care to grab the all_mddevs_lock whenever navigating
257 * the list, and to always hold a refcount when unlocked.
258 * Any code which breaks out of this loop while own
259 * a reference to the current mddev and must mddev_put it.
261 #define for_each_mddev(mddev,tmp) \
263 for (({ spin_lock(&all_mddevs_lock); \
264 tmp = all_mddevs.next; \
266 ({ if (tmp != &all_mddevs) \
267 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
268 spin_unlock(&all_mddevs_lock); \
269 if (mddev) mddev_put(mddev); \
270 mddev = list_entry(tmp, mddev_t, all_mddevs); \
271 tmp != &all_mddevs;}); \
272 ({ spin_lock(&all_mddevs_lock); \
277 /* Rather than calling directly into the personality make_request function,
278 * IO requests come here first so that we can check if the device is
279 * being suspended pending a reconfiguration.
280 * We hold a refcount over the call to ->make_request. By the time that
281 * call has finished, the bio has been linked into some internal structure
282 * and so is visible to ->quiesce(), so we don't need the refcount any more.
284 static int md_make_request(struct request_queue *q, struct bio *bio)
286 const int rw = bio_data_dir(bio);
287 mddev_t *mddev = q->queuedata;
291 if (mddev == NULL || mddev->pers == NULL
296 smp_rmb(); /* Ensure implications of 'active' are visible */
298 if (mddev->suspended) {
301 prepare_to_wait(&mddev->sb_wait, &__wait,
302 TASK_UNINTERRUPTIBLE);
303 if (!mddev->suspended)
309 finish_wait(&mddev->sb_wait, &__wait);
311 atomic_inc(&mddev->active_io);
314 rv = mddev->pers->make_request(mddev, bio);
316 cpu = part_stat_lock();
317 part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]);
318 part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw],
322 if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended)
323 wake_up(&mddev->sb_wait);
328 /* mddev_suspend makes sure no new requests are submitted
329 * to the device, and that any requests that have been submitted
330 * are completely handled.
331 * Once ->stop is called and completes, the module will be completely
334 void mddev_suspend(mddev_t *mddev)
336 BUG_ON(mddev->suspended);
337 mddev->suspended = 1;
339 wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0);
340 mddev->pers->quiesce(mddev, 1);
342 EXPORT_SYMBOL_GPL(mddev_suspend);
344 void mddev_resume(mddev_t *mddev)
346 mddev->suspended = 0;
347 wake_up(&mddev->sb_wait);
348 mddev->pers->quiesce(mddev, 0);
350 EXPORT_SYMBOL_GPL(mddev_resume);
352 int mddev_congested(mddev_t *mddev, int bits)
354 return mddev->suspended;
356 EXPORT_SYMBOL(mddev_congested);
359 * Generic flush handling for md
362 static void md_end_flush(struct bio *bio, int err)
364 mdk_rdev_t *rdev = bio->bi_private;
365 mddev_t *mddev = rdev->mddev;
367 rdev_dec_pending(rdev, mddev);
369 if (atomic_dec_and_test(&mddev->flush_pending)) {
370 /* The pre-request flush has finished */
371 queue_work(md_wq, &mddev->flush_work);
376 static void md_submit_flush_data(struct work_struct *ws);
378 static void submit_flushes(struct work_struct *ws)
380 mddev_t *mddev = container_of(ws, mddev_t, flush_work);
383 INIT_WORK(&mddev->flush_work, md_submit_flush_data);
384 atomic_set(&mddev->flush_pending, 1);
386 list_for_each_entry_rcu(rdev, &mddev->disks, same_set)
387 if (rdev->raid_disk >= 0 &&
388 !test_bit(Faulty, &rdev->flags)) {
389 /* Take two references, one is dropped
390 * when request finishes, one after
391 * we reclaim rcu_read_lock
394 atomic_inc(&rdev->nr_pending);
395 atomic_inc(&rdev->nr_pending);
397 bi = bio_alloc_mddev(GFP_KERNEL, 0, mddev);
398 bi->bi_end_io = md_end_flush;
399 bi->bi_private = rdev;
400 bi->bi_bdev = rdev->bdev;
401 atomic_inc(&mddev->flush_pending);
402 submit_bio(WRITE_FLUSH, bi);
404 rdev_dec_pending(rdev, mddev);
407 if (atomic_dec_and_test(&mddev->flush_pending))
408 queue_work(md_wq, &mddev->flush_work);
411 static void md_submit_flush_data(struct work_struct *ws)
413 mddev_t *mddev = container_of(ws, mddev_t, flush_work);
414 struct bio *bio = mddev->flush_bio;
416 if (bio->bi_size == 0)
417 /* an empty barrier - all done */
420 bio->bi_rw &= ~REQ_FLUSH;
421 if (mddev->pers->make_request(mddev, bio))
422 generic_make_request(bio);
425 mddev->flush_bio = NULL;
426 wake_up(&mddev->sb_wait);
429 void md_flush_request(mddev_t *mddev, struct bio *bio)
431 spin_lock_irq(&mddev->write_lock);
432 wait_event_lock_irq(mddev->sb_wait,
434 mddev->write_lock, /*nothing*/);
435 mddev->flush_bio = bio;
436 spin_unlock_irq(&mddev->write_lock);
438 INIT_WORK(&mddev->flush_work, submit_flushes);
439 queue_work(md_wq, &mddev->flush_work);
441 EXPORT_SYMBOL(md_flush_request);
443 /* Support for plugging.
444 * This mirrors the plugging support in request_queue, but does not
445 * require having a whole queue
447 static void plugger_work(struct work_struct *work)
449 struct plug_handle *plug =
450 container_of(work, struct plug_handle, unplug_work);
451 plug->unplug_fn(plug);
453 static void plugger_timeout(unsigned long data)
455 struct plug_handle *plug = (void *)data;
456 kblockd_schedule_work(NULL, &plug->unplug_work);
458 void plugger_init(struct plug_handle *plug,
459 void (*unplug_fn)(struct plug_handle *))
461 plug->unplug_flag = 0;
462 plug->unplug_fn = unplug_fn;
463 init_timer(&plug->unplug_timer);
464 plug->unplug_timer.function = plugger_timeout;
465 plug->unplug_timer.data = (unsigned long)plug;
466 INIT_WORK(&plug->unplug_work, plugger_work);
468 EXPORT_SYMBOL_GPL(plugger_init);
470 void plugger_set_plug(struct plug_handle *plug)
472 if (!test_and_set_bit(PLUGGED_FLAG, &plug->unplug_flag))
473 mod_timer(&plug->unplug_timer, jiffies + msecs_to_jiffies(3)+1);
475 EXPORT_SYMBOL_GPL(plugger_set_plug);
477 int plugger_remove_plug(struct plug_handle *plug)
479 if (test_and_clear_bit(PLUGGED_FLAG, &plug->unplug_flag)) {
480 del_timer(&plug->unplug_timer);
485 EXPORT_SYMBOL_GPL(plugger_remove_plug);
488 static inline mddev_t *mddev_get(mddev_t *mddev)
490 atomic_inc(&mddev->active);
494 static void mddev_delayed_delete(struct work_struct *ws);
496 static void mddev_put(mddev_t *mddev)
498 struct bio_set *bs = NULL;
500 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
502 if (!mddev->raid_disks && list_empty(&mddev->disks) &&
503 mddev->ctime == 0 && !mddev->hold_active) {
504 /* Array is not configured at all, and not held active,
506 list_del(&mddev->all_mddevs);
508 mddev->bio_set = NULL;
509 if (mddev->gendisk) {
510 /* We did a probe so need to clean up. Call
511 * queue_work inside the spinlock so that
512 * flush_workqueue() after mddev_find will
513 * succeed in waiting for the work to be done.
515 INIT_WORK(&mddev->del_work, mddev_delayed_delete);
516 queue_work(md_misc_wq, &mddev->del_work);
520 spin_unlock(&all_mddevs_lock);
525 void mddev_init(mddev_t *mddev)
527 mutex_init(&mddev->open_mutex);
528 mutex_init(&mddev->reconfig_mutex);
529 mutex_init(&mddev->bitmap_info.mutex);
530 INIT_LIST_HEAD(&mddev->disks);
531 INIT_LIST_HEAD(&mddev->all_mddevs);
532 init_timer(&mddev->safemode_timer);
533 atomic_set(&mddev->active, 1);
534 atomic_set(&mddev->openers, 0);
535 atomic_set(&mddev->active_io, 0);
536 spin_lock_init(&mddev->write_lock);
537 atomic_set(&mddev->flush_pending, 0);
538 init_waitqueue_head(&mddev->sb_wait);
539 init_waitqueue_head(&mddev->recovery_wait);
540 mddev->reshape_position = MaxSector;
541 mddev->resync_min = 0;
542 mddev->resync_max = MaxSector;
543 mddev->level = LEVEL_NONE;
545 EXPORT_SYMBOL_GPL(mddev_init);
547 static mddev_t * mddev_find(dev_t unit)
549 mddev_t *mddev, *new = NULL;
552 spin_lock(&all_mddevs_lock);
555 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
556 if (mddev->unit == unit) {
558 spin_unlock(&all_mddevs_lock);
564 list_add(&new->all_mddevs, &all_mddevs);
565 spin_unlock(&all_mddevs_lock);
566 new->hold_active = UNTIL_IOCTL;
570 /* find an unused unit number */
571 static int next_minor = 512;
572 int start = next_minor;
576 dev = MKDEV(MD_MAJOR, next_minor);
578 if (next_minor > MINORMASK)
580 if (next_minor == start) {
581 /* Oh dear, all in use. */
582 spin_unlock(&all_mddevs_lock);
588 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
589 if (mddev->unit == dev) {
595 new->md_minor = MINOR(dev);
596 new->hold_active = UNTIL_STOP;
597 list_add(&new->all_mddevs, &all_mddevs);
598 spin_unlock(&all_mddevs_lock);
601 spin_unlock(&all_mddevs_lock);
603 new = kzalloc(sizeof(*new), GFP_KERNEL);
608 if (MAJOR(unit) == MD_MAJOR)
609 new->md_minor = MINOR(unit);
611 new->md_minor = MINOR(unit) >> MdpMinorShift;
618 static inline int mddev_lock(mddev_t * mddev)
620 return mutex_lock_interruptible(&mddev->reconfig_mutex);
623 static inline int mddev_is_locked(mddev_t *mddev)
625 return mutex_is_locked(&mddev->reconfig_mutex);
628 static inline int mddev_trylock(mddev_t * mddev)
630 return mutex_trylock(&mddev->reconfig_mutex);
633 static struct attribute_group md_redundancy_group;
635 static void mddev_unlock(mddev_t * mddev)
637 if (mddev->to_remove) {
638 /* These cannot be removed under reconfig_mutex as
639 * an access to the files will try to take reconfig_mutex
640 * while holding the file unremovable, which leads to
642 * So hold set sysfs_active while the remove in happeing,
643 * and anything else which might set ->to_remove or my
644 * otherwise change the sysfs namespace will fail with
645 * -EBUSY if sysfs_active is still set.
646 * We set sysfs_active under reconfig_mutex and elsewhere
647 * test it under the same mutex to ensure its correct value
650 struct attribute_group *to_remove = mddev->to_remove;
651 mddev->to_remove = NULL;
652 mddev->sysfs_active = 1;
653 mutex_unlock(&mddev->reconfig_mutex);
655 if (mddev->kobj.sd) {
656 if (to_remove != &md_redundancy_group)
657 sysfs_remove_group(&mddev->kobj, to_remove);
658 if (mddev->pers == NULL ||
659 mddev->pers->sync_request == NULL) {
660 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
661 if (mddev->sysfs_action)
662 sysfs_put(mddev->sysfs_action);
663 mddev->sysfs_action = NULL;
666 mddev->sysfs_active = 0;
668 mutex_unlock(&mddev->reconfig_mutex);
670 md_wakeup_thread(mddev->thread);
673 static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr)
677 list_for_each_entry(rdev, &mddev->disks, same_set)
678 if (rdev->desc_nr == nr)
684 static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev)
688 list_for_each_entry(rdev, &mddev->disks, same_set)
689 if (rdev->bdev->bd_dev == dev)
695 static struct mdk_personality *find_pers(int level, char *clevel)
697 struct mdk_personality *pers;
698 list_for_each_entry(pers, &pers_list, list) {
699 if (level != LEVEL_NONE && pers->level == level)
701 if (strcmp(pers->name, clevel)==0)
707 /* return the offset of the super block in 512byte sectors */
708 static inline sector_t calc_dev_sboffset(mdk_rdev_t *rdev)
710 sector_t num_sectors = i_size_read(rdev->bdev->bd_inode) / 512;
711 return MD_NEW_SIZE_SECTORS(num_sectors);
714 static int alloc_disk_sb(mdk_rdev_t * rdev)
719 rdev->sb_page = alloc_page(GFP_KERNEL);
720 if (!rdev->sb_page) {
721 printk(KERN_ALERT "md: out of memory.\n");
728 static void free_disk_sb(mdk_rdev_t * rdev)
731 put_page(rdev->sb_page);
733 rdev->sb_page = NULL;
740 static void super_written(struct bio *bio, int error)
742 mdk_rdev_t *rdev = bio->bi_private;
743 mddev_t *mddev = rdev->mddev;
745 if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) {
746 printk("md: super_written gets error=%d, uptodate=%d\n",
747 error, test_bit(BIO_UPTODATE, &bio->bi_flags));
748 WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags));
749 md_error(mddev, rdev);
752 if (atomic_dec_and_test(&mddev->pending_writes))
753 wake_up(&mddev->sb_wait);
757 void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
758 sector_t sector, int size, struct page *page)
760 /* write first size bytes of page to sector of rdev
761 * Increment mddev->pending_writes before returning
762 * and decrement it on completion, waking up sb_wait
763 * if zero is reached.
764 * If an error occurred, call md_error
766 struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, mddev);
768 bio->bi_bdev = rdev->bdev;
769 bio->bi_sector = sector;
770 bio_add_page(bio, page, size, 0);
771 bio->bi_private = rdev;
772 bio->bi_end_io = super_written;
774 atomic_inc(&mddev->pending_writes);
775 submit_bio(REQ_WRITE | REQ_SYNC | REQ_UNPLUG | REQ_FLUSH | REQ_FUA,
779 void md_super_wait(mddev_t *mddev)
781 /* wait for all superblock writes that were scheduled to complete */
784 prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE);
785 if (atomic_read(&mddev->pending_writes)==0)
789 finish_wait(&mddev->sb_wait, &wq);
792 static void bi_complete(struct bio *bio, int error)
794 complete((struct completion*)bio->bi_private);
797 int sync_page_io(mdk_rdev_t *rdev, sector_t sector, int size,
798 struct page *page, int rw, bool metadata_op)
800 struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, rdev->mddev);
801 struct completion event;
804 rw |= REQ_SYNC | REQ_UNPLUG;
806 bio->bi_bdev = rdev->bdev;
808 bio->bi_sector = sector + rdev->sb_start;
810 bio->bi_sector = sector + rdev->data_offset;
811 bio_add_page(bio, page, size, 0);
812 init_completion(&event);
813 bio->bi_private = &event;
814 bio->bi_end_io = bi_complete;
816 wait_for_completion(&event);
818 ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
822 EXPORT_SYMBOL_GPL(sync_page_io);
824 static int read_disk_sb(mdk_rdev_t * rdev, int size)
826 char b[BDEVNAME_SIZE];
827 if (!rdev->sb_page) {
835 if (!sync_page_io(rdev, 0, size, rdev->sb_page, READ, true))
841 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
842 bdevname(rdev->bdev,b));
846 static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
848 return sb1->set_uuid0 == sb2->set_uuid0 &&
849 sb1->set_uuid1 == sb2->set_uuid1 &&
850 sb1->set_uuid2 == sb2->set_uuid2 &&
851 sb1->set_uuid3 == sb2->set_uuid3;
854 static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
857 mdp_super_t *tmp1, *tmp2;
859 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
860 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
862 if (!tmp1 || !tmp2) {
864 printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n");
872 * nr_disks is not constant
877 ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0);
885 static u32 md_csum_fold(u32 csum)
887 csum = (csum & 0xffff) + (csum >> 16);
888 return (csum & 0xffff) + (csum >> 16);
891 static unsigned int calc_sb_csum(mdp_super_t * sb)
894 u32 *sb32 = (u32*)sb;
896 unsigned int disk_csum, csum;
898 disk_csum = sb->sb_csum;
901 for (i = 0; i < MD_SB_BYTES/4 ; i++)
903 csum = (newcsum & 0xffffffff) + (newcsum>>32);
907 /* This used to use csum_partial, which was wrong for several
908 * reasons including that different results are returned on
909 * different architectures. It isn't critical that we get exactly
910 * the same return value as before (we always csum_fold before
911 * testing, and that removes any differences). However as we
912 * know that csum_partial always returned a 16bit value on
913 * alphas, do a fold to maximise conformity to previous behaviour.
915 sb->sb_csum = md_csum_fold(disk_csum);
917 sb->sb_csum = disk_csum;
924 * Handle superblock details.
925 * We want to be able to handle multiple superblock formats
926 * so we have a common interface to them all, and an array of
927 * different handlers.
928 * We rely on user-space to write the initial superblock, and support
929 * reading and updating of superblocks.
930 * Interface methods are:
931 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
932 * loads and validates a superblock on dev.
933 * if refdev != NULL, compare superblocks on both devices
935 * 0 - dev has a superblock that is compatible with refdev
936 * 1 - dev has a superblock that is compatible and newer than refdev
937 * so dev should be used as the refdev in future
938 * -EINVAL superblock incompatible or invalid
939 * -othererror e.g. -EIO
941 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
942 * Verify that dev is acceptable into mddev.
943 * The first time, mddev->raid_disks will be 0, and data from
944 * dev should be merged in. Subsequent calls check that dev
945 * is new enough. Return 0 or -EINVAL
947 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
948 * Update the superblock for rdev with data in mddev
949 * This does not write to disc.
955 struct module *owner;
956 int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev,
958 int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev);
959 void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev);
960 unsigned long long (*rdev_size_change)(mdk_rdev_t *rdev,
961 sector_t num_sectors);
965 * Check that the given mddev has no bitmap.
967 * This function is called from the run method of all personalities that do not
968 * support bitmaps. It prints an error message and returns non-zero if mddev
969 * has a bitmap. Otherwise, it returns 0.
972 int md_check_no_bitmap(mddev_t *mddev)
974 if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset)
976 printk(KERN_ERR "%s: bitmaps are not supported for %s\n",
977 mdname(mddev), mddev->pers->name);
980 EXPORT_SYMBOL(md_check_no_bitmap);
983 * load_super for 0.90.0
985 static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
987 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
992 * Calculate the position of the superblock (512byte sectors),
993 * it's at the end of the disk.
995 * It also happens to be a multiple of 4Kb.
997 rdev->sb_start = calc_dev_sboffset(rdev);
999 ret = read_disk_sb(rdev, MD_SB_BYTES);
1000 if (ret) return ret;
1004 bdevname(rdev->bdev, b);
1005 sb = (mdp_super_t*)page_address(rdev->sb_page);
1007 if (sb->md_magic != MD_SB_MAGIC) {
1008 printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
1013 if (sb->major_version != 0 ||
1014 sb->minor_version < 90 ||
1015 sb->minor_version > 91) {
1016 printk(KERN_WARNING "Bad version number %d.%d on %s\n",
1017 sb->major_version, sb->minor_version,
1022 if (sb->raid_disks <= 0)
1025 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
1026 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
1031 rdev->preferred_minor = sb->md_minor;
1032 rdev->data_offset = 0;
1033 rdev->sb_size = MD_SB_BYTES;
1035 if (sb->level == LEVEL_MULTIPATH)
1038 rdev->desc_nr = sb->this_disk.number;
1044 mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page);
1045 if (!uuid_equal(refsb, sb)) {
1046 printk(KERN_WARNING "md: %s has different UUID to %s\n",
1047 b, bdevname(refdev->bdev,b2));
1050 if (!sb_equal(refsb, sb)) {
1051 printk(KERN_WARNING "md: %s has same UUID"
1052 " but different superblock to %s\n",
1053 b, bdevname(refdev->bdev, b2));
1057 ev2 = md_event(refsb);
1063 rdev->sectors = rdev->sb_start;
1065 if (rdev->sectors < sb->size * 2 && sb->level > 1)
1066 /* "this cannot possibly happen" ... */
1074 * validate_super for 0.90.0
1076 static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
1079 mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page);
1080 __u64 ev1 = md_event(sb);
1082 rdev->raid_disk = -1;
1083 clear_bit(Faulty, &rdev->flags);
1084 clear_bit(In_sync, &rdev->flags);
1085 clear_bit(WriteMostly, &rdev->flags);
1087 if (mddev->raid_disks == 0) {
1088 mddev->major_version = 0;
1089 mddev->minor_version = sb->minor_version;
1090 mddev->patch_version = sb->patch_version;
1091 mddev->external = 0;
1092 mddev->chunk_sectors = sb->chunk_size >> 9;
1093 mddev->ctime = sb->ctime;
1094 mddev->utime = sb->utime;
1095 mddev->level = sb->level;
1096 mddev->clevel[0] = 0;
1097 mddev->layout = sb->layout;
1098 mddev->raid_disks = sb->raid_disks;
1099 mddev->dev_sectors = sb->size * 2;
1100 mddev->events = ev1;
1101 mddev->bitmap_info.offset = 0;
1102 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
1104 if (mddev->minor_version >= 91) {
1105 mddev->reshape_position = sb->reshape_position;
1106 mddev->delta_disks = sb->delta_disks;
1107 mddev->new_level = sb->new_level;
1108 mddev->new_layout = sb->new_layout;
1109 mddev->new_chunk_sectors = sb->new_chunk >> 9;
1111 mddev->reshape_position = MaxSector;
1112 mddev->delta_disks = 0;
1113 mddev->new_level = mddev->level;
1114 mddev->new_layout = mddev->layout;
1115 mddev->new_chunk_sectors = mddev->chunk_sectors;
1118 if (sb->state & (1<<MD_SB_CLEAN))
1119 mddev->recovery_cp = MaxSector;
1121 if (sb->events_hi == sb->cp_events_hi &&
1122 sb->events_lo == sb->cp_events_lo) {
1123 mddev->recovery_cp = sb->recovery_cp;
1125 mddev->recovery_cp = 0;
1128 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
1129 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
1130 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
1131 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
1133 mddev->max_disks = MD_SB_DISKS;
1135 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
1136 mddev->bitmap_info.file == NULL)
1137 mddev->bitmap_info.offset =
1138 mddev->bitmap_info.default_offset;
1140 } else if (mddev->pers == NULL) {
1141 /* Insist on good event counter while assembling, except
1142 * for spares (which don't need an event count) */
1144 if (sb->disks[rdev->desc_nr].state & (
1145 (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE)))
1146 if (ev1 < mddev->events)
1148 } else if (mddev->bitmap) {
1149 /* if adding to array with a bitmap, then we can accept an
1150 * older device ... but not too old.
1152 if (ev1 < mddev->bitmap->events_cleared)
1155 if (ev1 < mddev->events)
1156 /* just a hot-add of a new device, leave raid_disk at -1 */
1160 if (mddev->level != LEVEL_MULTIPATH) {
1161 desc = sb->disks + rdev->desc_nr;
1163 if (desc->state & (1<<MD_DISK_FAULTY))
1164 set_bit(Faulty, &rdev->flags);
1165 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
1166 desc->raid_disk < mddev->raid_disks */) {
1167 set_bit(In_sync, &rdev->flags);
1168 rdev->raid_disk = desc->raid_disk;
1169 } else if (desc->state & (1<<MD_DISK_ACTIVE)) {
1170 /* active but not in sync implies recovery up to
1171 * reshape position. We don't know exactly where
1172 * that is, so set to zero for now */
1173 if (mddev->minor_version >= 91) {
1174 rdev->recovery_offset = 0;
1175 rdev->raid_disk = desc->raid_disk;
1178 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
1179 set_bit(WriteMostly, &rdev->flags);
1180 } else /* MULTIPATH are always insync */
1181 set_bit(In_sync, &rdev->flags);
1186 * sync_super for 0.90.0
1188 static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1192 int next_spare = mddev->raid_disks;
1195 /* make rdev->sb match mddev data..
1198 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1199 * 3/ any empty disks < next_spare become removed
1201 * disks[0] gets initialised to REMOVED because
1202 * we cannot be sure from other fields if it has
1203 * been initialised or not.
1206 int active=0, working=0,failed=0,spare=0,nr_disks=0;
1208 rdev->sb_size = MD_SB_BYTES;
1210 sb = (mdp_super_t*)page_address(rdev->sb_page);
1212 memset(sb, 0, sizeof(*sb));
1214 sb->md_magic = MD_SB_MAGIC;
1215 sb->major_version = mddev->major_version;
1216 sb->patch_version = mddev->patch_version;
1217 sb->gvalid_words = 0; /* ignored */
1218 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
1219 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
1220 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
1221 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
1223 sb->ctime = mddev->ctime;
1224 sb->level = mddev->level;
1225 sb->size = mddev->dev_sectors / 2;
1226 sb->raid_disks = mddev->raid_disks;
1227 sb->md_minor = mddev->md_minor;
1228 sb->not_persistent = 0;
1229 sb->utime = mddev->utime;
1231 sb->events_hi = (mddev->events>>32);
1232 sb->events_lo = (u32)mddev->events;
1234 if (mddev->reshape_position == MaxSector)
1235 sb->minor_version = 90;
1237 sb->minor_version = 91;
1238 sb->reshape_position = mddev->reshape_position;
1239 sb->new_level = mddev->new_level;
1240 sb->delta_disks = mddev->delta_disks;
1241 sb->new_layout = mddev->new_layout;
1242 sb->new_chunk = mddev->new_chunk_sectors << 9;
1244 mddev->minor_version = sb->minor_version;
1247 sb->recovery_cp = mddev->recovery_cp;
1248 sb->cp_events_hi = (mddev->events>>32);
1249 sb->cp_events_lo = (u32)mddev->events;
1250 if (mddev->recovery_cp == MaxSector)
1251 sb->state = (1<< MD_SB_CLEAN);
1253 sb->recovery_cp = 0;
1255 sb->layout = mddev->layout;
1256 sb->chunk_size = mddev->chunk_sectors << 9;
1258 if (mddev->bitmap && mddev->bitmap_info.file == NULL)
1259 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
1261 sb->disks[0].state = (1<<MD_DISK_REMOVED);
1262 list_for_each_entry(rdev2, &mddev->disks, same_set) {
1265 int is_active = test_bit(In_sync, &rdev2->flags);
1267 if (rdev2->raid_disk >= 0 &&
1268 sb->minor_version >= 91)
1269 /* we have nowhere to store the recovery_offset,
1270 * but if it is not below the reshape_position,
1271 * we can piggy-back on that.
1274 if (rdev2->raid_disk < 0 ||
1275 test_bit(Faulty, &rdev2->flags))
1278 desc_nr = rdev2->raid_disk;
1280 desc_nr = next_spare++;
1281 rdev2->desc_nr = desc_nr;
1282 d = &sb->disks[rdev2->desc_nr];
1284 d->number = rdev2->desc_nr;
1285 d->major = MAJOR(rdev2->bdev->bd_dev);
1286 d->minor = MINOR(rdev2->bdev->bd_dev);
1288 d->raid_disk = rdev2->raid_disk;
1290 d->raid_disk = rdev2->desc_nr; /* compatibility */
1291 if (test_bit(Faulty, &rdev2->flags))
1292 d->state = (1<<MD_DISK_FAULTY);
1293 else if (is_active) {
1294 d->state = (1<<MD_DISK_ACTIVE);
1295 if (test_bit(In_sync, &rdev2->flags))
1296 d->state |= (1<<MD_DISK_SYNC);
1304 if (test_bit(WriteMostly, &rdev2->flags))
1305 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1307 /* now set the "removed" and "faulty" bits on any missing devices */
1308 for (i=0 ; i < mddev->raid_disks ; i++) {
1309 mdp_disk_t *d = &sb->disks[i];
1310 if (d->state == 0 && d->number == 0) {
1313 d->state = (1<<MD_DISK_REMOVED);
1314 d->state |= (1<<MD_DISK_FAULTY);
1318 sb->nr_disks = nr_disks;
1319 sb->active_disks = active;
1320 sb->working_disks = working;
1321 sb->failed_disks = failed;
1322 sb->spare_disks = spare;
1324 sb->this_disk = sb->disks[rdev->desc_nr];
1325 sb->sb_csum = calc_sb_csum(sb);
1329 * rdev_size_change for 0.90.0
1331 static unsigned long long
1332 super_90_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors)
1334 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1335 return 0; /* component must fit device */
1336 if (rdev->mddev->bitmap_info.offset)
1337 return 0; /* can't move bitmap */
1338 rdev->sb_start = calc_dev_sboffset(rdev);
1339 if (!num_sectors || num_sectors > rdev->sb_start)
1340 num_sectors = rdev->sb_start;
1341 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1343 md_super_wait(rdev->mddev);
1349 * version 1 superblock
1352 static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb)
1356 unsigned long long newcsum;
1357 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1358 __le32 *isuper = (__le32*)sb;
1361 disk_csum = sb->sb_csum;
1364 for (i=0; size>=4; size -= 4 )
1365 newcsum += le32_to_cpu(*isuper++);
1368 newcsum += le16_to_cpu(*(__le16*) isuper);
1370 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1371 sb->sb_csum = disk_csum;
1372 return cpu_to_le32(csum);
1375 static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
1377 struct mdp_superblock_1 *sb;
1380 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1384 * Calculate the position of the superblock in 512byte sectors.
1385 * It is always aligned to a 4K boundary and
1386 * depeding on minor_version, it can be:
1387 * 0: At least 8K, but less than 12K, from end of device
1388 * 1: At start of device
1389 * 2: 4K from start of device.
1391 switch(minor_version) {
1393 sb_start = i_size_read(rdev->bdev->bd_inode) >> 9;
1395 sb_start &= ~(sector_t)(4*2-1);
1406 rdev->sb_start = sb_start;
1408 /* superblock is rarely larger than 1K, but it can be larger,
1409 * and it is safe to read 4k, so we do that
1411 ret = read_disk_sb(rdev, 4096);
1412 if (ret) return ret;
1415 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1417 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1418 sb->major_version != cpu_to_le32(1) ||
1419 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1420 le64_to_cpu(sb->super_offset) != rdev->sb_start ||
1421 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1424 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1425 printk("md: invalid superblock checksum on %s\n",
1426 bdevname(rdev->bdev,b));
1429 if (le64_to_cpu(sb->data_size) < 10) {
1430 printk("md: data_size too small on %s\n",
1431 bdevname(rdev->bdev,b));
1435 rdev->preferred_minor = 0xffff;
1436 rdev->data_offset = le64_to_cpu(sb->data_offset);
1437 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1439 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1440 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1441 if (rdev->sb_size & bmask)
1442 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1445 && rdev->data_offset < sb_start + (rdev->sb_size/512))
1448 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1451 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1457 struct mdp_superblock_1 *refsb =
1458 (struct mdp_superblock_1*)page_address(refdev->sb_page);
1460 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1461 sb->level != refsb->level ||
1462 sb->layout != refsb->layout ||
1463 sb->chunksize != refsb->chunksize) {
1464 printk(KERN_WARNING "md: %s has strangely different"
1465 " superblock to %s\n",
1466 bdevname(rdev->bdev,b),
1467 bdevname(refdev->bdev,b2));
1470 ev1 = le64_to_cpu(sb->events);
1471 ev2 = le64_to_cpu(refsb->events);
1479 rdev->sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) -
1480 le64_to_cpu(sb->data_offset);
1482 rdev->sectors = rdev->sb_start;
1483 if (rdev->sectors < le64_to_cpu(sb->data_size))
1485 rdev->sectors = le64_to_cpu(sb->data_size);
1486 if (le64_to_cpu(sb->size) > rdev->sectors)
1491 static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
1493 struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1494 __u64 ev1 = le64_to_cpu(sb->events);
1496 rdev->raid_disk = -1;
1497 clear_bit(Faulty, &rdev->flags);
1498 clear_bit(In_sync, &rdev->flags);
1499 clear_bit(WriteMostly, &rdev->flags);
1501 if (mddev->raid_disks == 0) {
1502 mddev->major_version = 1;
1503 mddev->patch_version = 0;
1504 mddev->external = 0;
1505 mddev->chunk_sectors = le32_to_cpu(sb->chunksize);
1506 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1507 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1508 mddev->level = le32_to_cpu(sb->level);
1509 mddev->clevel[0] = 0;
1510 mddev->layout = le32_to_cpu(sb->layout);
1511 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1512 mddev->dev_sectors = le64_to_cpu(sb->size);
1513 mddev->events = ev1;
1514 mddev->bitmap_info.offset = 0;
1515 mddev->bitmap_info.default_offset = 1024 >> 9;
1517 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1518 memcpy(mddev->uuid, sb->set_uuid, 16);
1520 mddev->max_disks = (4096-256)/2;
1522 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1523 mddev->bitmap_info.file == NULL )
1524 mddev->bitmap_info.offset =
1525 (__s32)le32_to_cpu(sb->bitmap_offset);
1527 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1528 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1529 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1530 mddev->new_level = le32_to_cpu(sb->new_level);
1531 mddev->new_layout = le32_to_cpu(sb->new_layout);
1532 mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk);
1534 mddev->reshape_position = MaxSector;
1535 mddev->delta_disks = 0;
1536 mddev->new_level = mddev->level;
1537 mddev->new_layout = mddev->layout;
1538 mddev->new_chunk_sectors = mddev->chunk_sectors;
1541 } else if (mddev->pers == NULL) {
1542 /* Insist of good event counter while assembling, except for
1543 * spares (which don't need an event count) */
1545 if (rdev->desc_nr >= 0 &&
1546 rdev->desc_nr < le32_to_cpu(sb->max_dev) &&
1547 le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < 0xfffe)
1548 if (ev1 < mddev->events)
1550 } else if (mddev->bitmap) {
1551 /* If adding to array with a bitmap, then we can accept an
1552 * older device, but not too old.
1554 if (ev1 < mddev->bitmap->events_cleared)
1557 if (ev1 < mddev->events)
1558 /* just a hot-add of a new device, leave raid_disk at -1 */
1561 if (mddev->level != LEVEL_MULTIPATH) {
1563 if (rdev->desc_nr < 0 ||
1564 rdev->desc_nr >= le32_to_cpu(sb->max_dev)) {
1568 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1570 case 0xffff: /* spare */
1572 case 0xfffe: /* faulty */
1573 set_bit(Faulty, &rdev->flags);
1576 if ((le32_to_cpu(sb->feature_map) &
1577 MD_FEATURE_RECOVERY_OFFSET))
1578 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1580 set_bit(In_sync, &rdev->flags);
1581 rdev->raid_disk = role;
1584 if (sb->devflags & WriteMostly1)
1585 set_bit(WriteMostly, &rdev->flags);
1586 } else /* MULTIPATH are always insync */
1587 set_bit(In_sync, &rdev->flags);
1592 static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1594 struct mdp_superblock_1 *sb;
1597 /* make rdev->sb match mddev and rdev data. */
1599 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1601 sb->feature_map = 0;
1603 sb->recovery_offset = cpu_to_le64(0);
1604 memset(sb->pad1, 0, sizeof(sb->pad1));
1605 memset(sb->pad2, 0, sizeof(sb->pad2));
1606 memset(sb->pad3, 0, sizeof(sb->pad3));
1608 sb->utime = cpu_to_le64((__u64)mddev->utime);
1609 sb->events = cpu_to_le64(mddev->events);
1611 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1613 sb->resync_offset = cpu_to_le64(0);
1615 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
1617 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
1618 sb->size = cpu_to_le64(mddev->dev_sectors);
1619 sb->chunksize = cpu_to_le32(mddev->chunk_sectors);
1620 sb->level = cpu_to_le32(mddev->level);
1621 sb->layout = cpu_to_le32(mddev->layout);
1623 if (mddev->bitmap && mddev->bitmap_info.file == NULL) {
1624 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset);
1625 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
1628 if (rdev->raid_disk >= 0 &&
1629 !test_bit(In_sync, &rdev->flags)) {
1631 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1632 sb->recovery_offset =
1633 cpu_to_le64(rdev->recovery_offset);
1636 if (mddev->reshape_position != MaxSector) {
1637 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1638 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1639 sb->new_layout = cpu_to_le32(mddev->new_layout);
1640 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1641 sb->new_level = cpu_to_le32(mddev->new_level);
1642 sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors);
1646 list_for_each_entry(rdev2, &mddev->disks, same_set)
1647 if (rdev2->desc_nr+1 > max_dev)
1648 max_dev = rdev2->desc_nr+1;
1650 if (max_dev > le32_to_cpu(sb->max_dev)) {
1652 sb->max_dev = cpu_to_le32(max_dev);
1653 rdev->sb_size = max_dev * 2 + 256;
1654 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1655 if (rdev->sb_size & bmask)
1656 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1658 max_dev = le32_to_cpu(sb->max_dev);
1660 for (i=0; i<max_dev;i++)
1661 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1663 list_for_each_entry(rdev2, &mddev->disks, same_set) {
1665 if (test_bit(Faulty, &rdev2->flags))
1666 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1667 else if (test_bit(In_sync, &rdev2->flags))
1668 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1669 else if (rdev2->raid_disk >= 0)
1670 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1672 sb->dev_roles[i] = cpu_to_le16(0xffff);
1675 sb->sb_csum = calc_sb_1_csum(sb);
1678 static unsigned long long
1679 super_1_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors)
1681 struct mdp_superblock_1 *sb;
1682 sector_t max_sectors;
1683 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1684 return 0; /* component must fit device */
1685 if (rdev->sb_start < rdev->data_offset) {
1686 /* minor versions 1 and 2; superblock before data */
1687 max_sectors = i_size_read(rdev->bdev->bd_inode) >> 9;
1688 max_sectors -= rdev->data_offset;
1689 if (!num_sectors || num_sectors > max_sectors)
1690 num_sectors = max_sectors;
1691 } else if (rdev->mddev->bitmap_info.offset) {
1692 /* minor version 0 with bitmap we can't move */
1695 /* minor version 0; superblock after data */
1697 sb_start = (i_size_read(rdev->bdev->bd_inode) >> 9) - 8*2;
1698 sb_start &= ~(sector_t)(4*2 - 1);
1699 max_sectors = rdev->sectors + sb_start - rdev->sb_start;
1700 if (!num_sectors || num_sectors > max_sectors)
1701 num_sectors = max_sectors;
1702 rdev->sb_start = sb_start;
1704 sb = (struct mdp_superblock_1 *) page_address(rdev->sb_page);
1705 sb->data_size = cpu_to_le64(num_sectors);
1706 sb->super_offset = rdev->sb_start;
1707 sb->sb_csum = calc_sb_1_csum(sb);
1708 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1710 md_super_wait(rdev->mddev);
1714 static struct super_type super_types[] = {
1717 .owner = THIS_MODULE,
1718 .load_super = super_90_load,
1719 .validate_super = super_90_validate,
1720 .sync_super = super_90_sync,
1721 .rdev_size_change = super_90_rdev_size_change,
1725 .owner = THIS_MODULE,
1726 .load_super = super_1_load,
1727 .validate_super = super_1_validate,
1728 .sync_super = super_1_sync,
1729 .rdev_size_change = super_1_rdev_size_change,
1733 static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)
1735 mdk_rdev_t *rdev, *rdev2;
1738 rdev_for_each_rcu(rdev, mddev1)
1739 rdev_for_each_rcu(rdev2, mddev2)
1740 if (rdev->bdev->bd_contains ==
1741 rdev2->bdev->bd_contains) {
1749 static LIST_HEAD(pending_raid_disks);
1752 * Try to register data integrity profile for an mddev
1754 * This is called when an array is started and after a disk has been kicked
1755 * from the array. It only succeeds if all working and active component devices
1756 * are integrity capable with matching profiles.
1758 int md_integrity_register(mddev_t *mddev)
1760 mdk_rdev_t *rdev, *reference = NULL;
1762 if (list_empty(&mddev->disks))
1763 return 0; /* nothing to do */
1764 if (blk_get_integrity(mddev->gendisk))
1765 return 0; /* already registered */
1766 list_for_each_entry(rdev, &mddev->disks, same_set) {
1767 /* skip spares and non-functional disks */
1768 if (test_bit(Faulty, &rdev->flags))
1770 if (rdev->raid_disk < 0)
1773 * If at least one rdev is not integrity capable, we can not
1774 * enable data integrity for the md device.
1776 if (!bdev_get_integrity(rdev->bdev))
1779 /* Use the first rdev as the reference */
1783 /* does this rdev's profile match the reference profile? */
1784 if (blk_integrity_compare(reference->bdev->bd_disk,
1785 rdev->bdev->bd_disk) < 0)
1789 * All component devices are integrity capable and have matching
1790 * profiles, register the common profile for the md device.
1792 if (blk_integrity_register(mddev->gendisk,
1793 bdev_get_integrity(reference->bdev)) != 0) {
1794 printk(KERN_ERR "md: failed to register integrity for %s\n",
1798 printk(KERN_NOTICE "md: data integrity on %s enabled\n",
1802 EXPORT_SYMBOL(md_integrity_register);
1804 /* Disable data integrity if non-capable/non-matching disk is being added */
1805 void md_integrity_add_rdev(mdk_rdev_t *rdev, mddev_t *mddev)
1807 struct blk_integrity *bi_rdev = bdev_get_integrity(rdev->bdev);
1808 struct blk_integrity *bi_mddev = blk_get_integrity(mddev->gendisk);
1810 if (!bi_mddev) /* nothing to do */
1812 if (rdev->raid_disk < 0) /* skip spares */
1814 if (bi_rdev && blk_integrity_compare(mddev->gendisk,
1815 rdev->bdev->bd_disk) >= 0)
1817 printk(KERN_NOTICE "disabling data integrity on %s\n", mdname(mddev));
1818 blk_integrity_unregister(mddev->gendisk);
1820 EXPORT_SYMBOL(md_integrity_add_rdev);
1822 static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
1824 char b[BDEVNAME_SIZE];
1834 /* prevent duplicates */
1835 if (find_rdev(mddev, rdev->bdev->bd_dev))
1838 /* make sure rdev->sectors exceeds mddev->dev_sectors */
1839 if (rdev->sectors && (mddev->dev_sectors == 0 ||
1840 rdev->sectors < mddev->dev_sectors)) {
1842 /* Cannot change size, so fail
1843 * If mddev->level <= 0, then we don't care
1844 * about aligning sizes (e.g. linear)
1846 if (mddev->level > 0)
1849 mddev->dev_sectors = rdev->sectors;
1852 /* Verify rdev->desc_nr is unique.
1853 * If it is -1, assign a free number, else
1854 * check number is not in use
1856 if (rdev->desc_nr < 0) {
1858 if (mddev->pers) choice = mddev->raid_disks;
1859 while (find_rdev_nr(mddev, choice))
1861 rdev->desc_nr = choice;
1863 if (find_rdev_nr(mddev, rdev->desc_nr))
1866 if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) {
1867 printk(KERN_WARNING "md: %s: array is limited to %d devices\n",
1868 mdname(mddev), mddev->max_disks);
1871 bdevname(rdev->bdev,b);
1872 while ( (s=strchr(b, '/')) != NULL)
1875 rdev->mddev = mddev;
1876 printk(KERN_INFO "md: bind<%s>\n", b);
1878 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
1881 ko = &part_to_dev(rdev->bdev->bd_part)->kobj;
1882 if (sysfs_create_link(&rdev->kobj, ko, "block"))
1883 /* failure here is OK */;
1884 rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state");
1886 list_add_rcu(&rdev->same_set, &mddev->disks);
1887 bd_claim_by_disk(rdev->bdev, rdev->bdev->bd_holder, mddev->gendisk);
1889 /* May as well allow recovery to be retried once */
1890 mddev->recovery_disabled = 0;
1895 printk(KERN_WARNING "md: failed to register dev-%s for %s\n",
1900 static void md_delayed_delete(struct work_struct *ws)
1902 mdk_rdev_t *rdev = container_of(ws, mdk_rdev_t, del_work);
1903 kobject_del(&rdev->kobj);
1904 kobject_put(&rdev->kobj);
1907 static void unbind_rdev_from_array(mdk_rdev_t * rdev)
1909 char b[BDEVNAME_SIZE];
1914 bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk);
1915 list_del_rcu(&rdev->same_set);
1916 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
1918 sysfs_remove_link(&rdev->kobj, "block");
1919 sysfs_put(rdev->sysfs_state);
1920 rdev->sysfs_state = NULL;
1921 /* We need to delay this, otherwise we can deadlock when
1922 * writing to 'remove' to "dev/state". We also need
1923 * to delay it due to rcu usage.
1926 INIT_WORK(&rdev->del_work, md_delayed_delete);
1927 kobject_get(&rdev->kobj);
1928 queue_work(md_misc_wq, &rdev->del_work);
1932 * prevent the device from being mounted, repartitioned or
1933 * otherwise reused by a RAID array (or any other kernel
1934 * subsystem), by bd_claiming the device.
1936 static int lock_rdev(mdk_rdev_t *rdev, dev_t dev, int shared)
1939 struct block_device *bdev;
1940 char b[BDEVNAME_SIZE];
1942 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
1944 printk(KERN_ERR "md: could not open %s.\n",
1945 __bdevname(dev, b));
1946 return PTR_ERR(bdev);
1948 err = bd_claim(bdev, shared ? (mdk_rdev_t *)lock_rdev : rdev);
1950 printk(KERN_ERR "md: could not bd_claim %s.\n",
1952 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
1956 set_bit(AllReserved, &rdev->flags);
1961 static void unlock_rdev(mdk_rdev_t *rdev)
1963 struct block_device *bdev = rdev->bdev;
1968 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
1971 void md_autodetect_dev(dev_t dev);
1973 static void export_rdev(mdk_rdev_t * rdev)
1975 char b[BDEVNAME_SIZE];
1976 printk(KERN_INFO "md: export_rdev(%s)\n",
1977 bdevname(rdev->bdev,b));
1982 if (test_bit(AutoDetected, &rdev->flags))
1983 md_autodetect_dev(rdev->bdev->bd_dev);
1986 kobject_put(&rdev->kobj);
1989 static void kick_rdev_from_array(mdk_rdev_t * rdev)
1991 unbind_rdev_from_array(rdev);
1995 static void export_array(mddev_t *mddev)
1997 mdk_rdev_t *rdev, *tmp;
1999 rdev_for_each(rdev, tmp, mddev) {
2004 kick_rdev_from_array(rdev);
2006 if (!list_empty(&mddev->disks))
2008 mddev->raid_disks = 0;
2009 mddev->major_version = 0;
2012 static void print_desc(mdp_disk_t *desc)
2014 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
2015 desc->major,desc->minor,desc->raid_disk,desc->state);
2018 static void print_sb_90(mdp_super_t *sb)
2023 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
2024 sb->major_version, sb->minor_version, sb->patch_version,
2025 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
2027 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
2028 sb->level, sb->size, sb->nr_disks, sb->raid_disks,
2029 sb->md_minor, sb->layout, sb->chunk_size);
2030 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
2031 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
2032 sb->utime, sb->state, sb->active_disks, sb->working_disks,
2033 sb->failed_disks, sb->spare_disks,
2034 sb->sb_csum, (unsigned long)sb->events_lo);
2037 for (i = 0; i < MD_SB_DISKS; i++) {
2040 desc = sb->disks + i;
2041 if (desc->number || desc->major || desc->minor ||
2042 desc->raid_disk || (desc->state && (desc->state != 4))) {
2043 printk(" D %2d: ", i);
2047 printk(KERN_INFO "md: THIS: ");
2048 print_desc(&sb->this_disk);
2051 static void print_sb_1(struct mdp_superblock_1 *sb)
2055 uuid = sb->set_uuid;
2057 "md: SB: (V:%u) (F:0x%08x) Array-ID:<%pU>\n"
2058 "md: Name: \"%s\" CT:%llu\n",
2059 le32_to_cpu(sb->major_version),
2060 le32_to_cpu(sb->feature_map),
2063 (unsigned long long)le64_to_cpu(sb->ctime)
2064 & MD_SUPERBLOCK_1_TIME_SEC_MASK);
2066 uuid = sb->device_uuid;
2068 "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu"
2070 "md: Dev:%08x UUID: %pU\n"
2071 "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n"
2072 "md: (MaxDev:%u) \n",
2073 le32_to_cpu(sb->level),
2074 (unsigned long long)le64_to_cpu(sb->size),
2075 le32_to_cpu(sb->raid_disks),
2076 le32_to_cpu(sb->layout),
2077 le32_to_cpu(sb->chunksize),
2078 (unsigned long long)le64_to_cpu(sb->data_offset),
2079 (unsigned long long)le64_to_cpu(sb->data_size),
2080 (unsigned long long)le64_to_cpu(sb->super_offset),
2081 (unsigned long long)le64_to_cpu(sb->recovery_offset),
2082 le32_to_cpu(sb->dev_number),
2085 (unsigned long long)le64_to_cpu(sb->utime) & MD_SUPERBLOCK_1_TIME_SEC_MASK,
2086 (unsigned long long)le64_to_cpu(sb->events),
2087 (unsigned long long)le64_to_cpu(sb->resync_offset),
2088 le32_to_cpu(sb->sb_csum),
2089 le32_to_cpu(sb->max_dev)
2093 static void print_rdev(mdk_rdev_t *rdev, int major_version)
2095 char b[BDEVNAME_SIZE];
2096 printk(KERN_INFO "md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n",
2097 bdevname(rdev->bdev, b), (unsigned long long)rdev->sectors,
2098 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
2100 if (rdev->sb_loaded) {
2101 printk(KERN_INFO "md: rdev superblock (MJ:%d):\n", major_version);
2102 switch (major_version) {
2104 print_sb_90((mdp_super_t*)page_address(rdev->sb_page));
2107 print_sb_1((struct mdp_superblock_1 *)page_address(rdev->sb_page));
2111 printk(KERN_INFO "md: no rdev superblock!\n");
2114 static void md_print_devices(void)
2116 struct list_head *tmp;
2119 char b[BDEVNAME_SIZE];
2122 printk("md: **********************************\n");
2123 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
2124 printk("md: **********************************\n");
2125 for_each_mddev(mddev, tmp) {
2128 bitmap_print_sb(mddev->bitmap);
2130 printk("%s: ", mdname(mddev));
2131 list_for_each_entry(rdev, &mddev->disks, same_set)
2132 printk("<%s>", bdevname(rdev->bdev,b));
2135 list_for_each_entry(rdev, &mddev->disks, same_set)
2136 print_rdev(rdev, mddev->major_version);
2138 printk("md: **********************************\n");
2143 static void sync_sbs(mddev_t * mddev, int nospares)
2145 /* Update each superblock (in-memory image), but
2146 * if we are allowed to, skip spares which already
2147 * have the right event counter, or have one earlier
2148 * (which would mean they aren't being marked as dirty
2149 * with the rest of the array)
2152 list_for_each_entry(rdev, &mddev->disks, same_set) {
2153 if (rdev->sb_events == mddev->events ||
2155 rdev->raid_disk < 0 &&
2156 rdev->sb_events+1 == mddev->events)) {
2157 /* Don't update this superblock */
2158 rdev->sb_loaded = 2;
2160 super_types[mddev->major_version].
2161 sync_super(mddev, rdev);
2162 rdev->sb_loaded = 1;
2167 static void md_update_sb(mddev_t * mddev, int force_change)
2174 /* First make sure individual recovery_offsets are correct */
2175 list_for_each_entry(rdev, &mddev->disks, same_set) {
2176 if (rdev->raid_disk >= 0 &&
2177 mddev->delta_disks >= 0 &&
2178 !test_bit(In_sync, &rdev->flags) &&
2179 mddev->curr_resync_completed > rdev->recovery_offset)
2180 rdev->recovery_offset = mddev->curr_resync_completed;
2183 if (!mddev->persistent) {
2184 clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
2185 clear_bit(MD_CHANGE_DEVS, &mddev->flags);
2186 if (!mddev->external)
2187 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2188 wake_up(&mddev->sb_wait);
2192 spin_lock_irq(&mddev->write_lock);
2194 mddev->utime = get_seconds();
2196 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
2198 if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags))
2199 /* just a clean<-> dirty transition, possibly leave spares alone,
2200 * though if events isn't the right even/odd, we will have to do
2206 if (mddev->degraded)
2207 /* If the array is degraded, then skipping spares is both
2208 * dangerous and fairly pointless.
2209 * Dangerous because a device that was removed from the array
2210 * might have a event_count that still looks up-to-date,
2211 * so it can be re-added without a resync.
2212 * Pointless because if there are any spares to skip,
2213 * then a recovery will happen and soon that array won't
2214 * be degraded any more and the spare can go back to sleep then.
2218 sync_req = mddev->in_sync;
2220 /* If this is just a dirty<->clean transition, and the array is clean
2221 * and 'events' is odd, we can roll back to the previous clean state */
2223 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
2224 && mddev->can_decrease_events
2225 && mddev->events != 1) {
2227 mddev->can_decrease_events = 0;
2229 /* otherwise we have to go forward and ... */
2231 mddev->can_decrease_events = nospares;
2234 if (!mddev->events) {
2236 * oops, this 64-bit counter should never wrap.
2237 * Either we are in around ~1 trillion A.C., assuming
2238 * 1 reboot per second, or we have a bug:
2243 sync_sbs(mddev, nospares);
2244 spin_unlock_irq(&mddev->write_lock);
2247 "md: updating %s RAID superblock on device (in sync %d)\n",
2248 mdname(mddev),mddev->in_sync);
2250 bitmap_update_sb(mddev->bitmap);
2251 list_for_each_entry(rdev, &mddev->disks, same_set) {
2252 char b[BDEVNAME_SIZE];
2253 dprintk(KERN_INFO "md: ");
2254 if (rdev->sb_loaded != 1)
2255 continue; /* no noise on spare devices */
2256 if (test_bit(Faulty, &rdev->flags))
2257 dprintk("(skipping faulty ");
2259 dprintk("%s ", bdevname(rdev->bdev,b));
2260 if (!test_bit(Faulty, &rdev->flags)) {
2261 md_super_write(mddev,rdev,
2262 rdev->sb_start, rdev->sb_size,
2264 dprintk(KERN_INFO "(write) %s's sb offset: %llu\n",
2265 bdevname(rdev->bdev,b),
2266 (unsigned long long)rdev->sb_start);
2267 rdev->sb_events = mddev->events;
2271 if (mddev->level == LEVEL_MULTIPATH)
2272 /* only need to write one superblock... */
2275 md_super_wait(mddev);
2276 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2278 spin_lock_irq(&mddev->write_lock);
2279 if (mddev->in_sync != sync_req ||
2280 test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
2281 /* have to write it out again */
2282 spin_unlock_irq(&mddev->write_lock);
2285 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2286 spin_unlock_irq(&mddev->write_lock);
2287 wake_up(&mddev->sb_wait);
2288 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
2289 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
2293 /* words written to sysfs files may, or may not, be \n terminated.
2294 * We want to accept with case. For this we use cmd_match.
2296 static int cmd_match(const char *cmd, const char *str)
2298 /* See if cmd, written into a sysfs file, matches
2299 * str. They must either be the same, or cmd can
2300 * have a trailing newline
2302 while (*cmd && *str && *cmd == *str) {
2313 struct rdev_sysfs_entry {
2314 struct attribute attr;
2315 ssize_t (*show)(mdk_rdev_t *, char *);
2316 ssize_t (*store)(mdk_rdev_t *, const char *, size_t);
2320 state_show(mdk_rdev_t *rdev, char *page)
2325 if (test_bit(Faulty, &rdev->flags)) {
2326 len+= sprintf(page+len, "%sfaulty",sep);
2329 if (test_bit(In_sync, &rdev->flags)) {
2330 len += sprintf(page+len, "%sin_sync",sep);
2333 if (test_bit(WriteMostly, &rdev->flags)) {
2334 len += sprintf(page+len, "%swrite_mostly",sep);
2337 if (test_bit(Blocked, &rdev->flags)) {
2338 len += sprintf(page+len, "%sblocked", sep);
2341 if (!test_bit(Faulty, &rdev->flags) &&
2342 !test_bit(In_sync, &rdev->flags)) {
2343 len += sprintf(page+len, "%sspare", sep);
2346 return len+sprintf(page+len, "\n");
2350 state_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2353 * faulty - simulates and error
2354 * remove - disconnects the device
2355 * writemostly - sets write_mostly
2356 * -writemostly - clears write_mostly
2357 * blocked - sets the Blocked flag
2358 * -blocked - clears the Blocked flag
2359 * insync - sets Insync providing device isn't active
2362 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
2363 md_error(rdev->mddev, rdev);
2365 } else if (cmd_match(buf, "remove")) {
2366 if (rdev->raid_disk >= 0)
2369 mddev_t *mddev = rdev->mddev;
2370 kick_rdev_from_array(rdev);
2372 md_update_sb(mddev, 1);
2373 md_new_event(mddev);
2376 } else if (cmd_match(buf, "writemostly")) {
2377 set_bit(WriteMostly, &rdev->flags);
2379 } else if (cmd_match(buf, "-writemostly")) {
2380 clear_bit(WriteMostly, &rdev->flags);
2382 } else if (cmd_match(buf, "blocked")) {
2383 set_bit(Blocked, &rdev->flags);
2385 } else if (cmd_match(buf, "-blocked")) {
2386 clear_bit(Blocked, &rdev->flags);
2387 wake_up(&rdev->blocked_wait);
2388 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2389 md_wakeup_thread(rdev->mddev->thread);
2392 } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) {
2393 set_bit(In_sync, &rdev->flags);
2397 sysfs_notify_dirent_safe(rdev->sysfs_state);
2398 return err ? err : len;
2400 static struct rdev_sysfs_entry rdev_state =
2401 __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store);
2404 errors_show(mdk_rdev_t *rdev, char *page)
2406 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
2410 errors_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2413 unsigned long n = simple_strtoul(buf, &e, 10);
2414 if (*buf && (*e == 0 || *e == '\n')) {
2415 atomic_set(&rdev->corrected_errors, n);
2420 static struct rdev_sysfs_entry rdev_errors =
2421 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
2424 slot_show(mdk_rdev_t *rdev, char *page)
2426 if (rdev->raid_disk < 0)
2427 return sprintf(page, "none\n");
2429 return sprintf(page, "%d\n", rdev->raid_disk);
2433 slot_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2438 int slot = simple_strtoul(buf, &e, 10);
2439 if (strncmp(buf, "none", 4)==0)
2441 else if (e==buf || (*e && *e!= '\n'))
2443 if (rdev->mddev->pers && slot == -1) {
2444 /* Setting 'slot' on an active array requires also
2445 * updating the 'rd%d' link, and communicating
2446 * with the personality with ->hot_*_disk.
2447 * For now we only support removing
2448 * failed/spare devices. This normally happens automatically,
2449 * but not when the metadata is externally managed.
2451 if (rdev->raid_disk == -1)
2453 /* personality does all needed checks */
2454 if (rdev->mddev->pers->hot_add_disk == NULL)
2456 err = rdev->mddev->pers->
2457 hot_remove_disk(rdev->mddev, rdev->raid_disk);
2460 sprintf(nm, "rd%d", rdev->raid_disk);
2461 sysfs_remove_link(&rdev->mddev->kobj, nm);
2462 rdev->raid_disk = -1;
2463 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2464 md_wakeup_thread(rdev->mddev->thread);
2465 } else if (rdev->mddev->pers) {
2467 /* Activating a spare .. or possibly reactivating
2468 * if we ever get bitmaps working here.
2471 if (rdev->raid_disk != -1)
2474 if (rdev->mddev->pers->hot_add_disk == NULL)
2477 list_for_each_entry(rdev2, &rdev->mddev->disks, same_set)
2478 if (rdev2->raid_disk == slot)
2481 rdev->raid_disk = slot;
2482 if (test_bit(In_sync, &rdev->flags))
2483 rdev->saved_raid_disk = slot;
2485 rdev->saved_raid_disk = -1;
2486 err = rdev->mddev->pers->
2487 hot_add_disk(rdev->mddev, rdev);
2489 rdev->raid_disk = -1;
2492 sysfs_notify_dirent_safe(rdev->sysfs_state);
2493 sprintf(nm, "rd%d", rdev->raid_disk);
2494 if (sysfs_create_link(&rdev->mddev->kobj, &rdev->kobj, nm))
2495 /* failure here is OK */;
2496 /* don't wakeup anyone, leave that to userspace. */
2498 if (slot >= rdev->mddev->raid_disks)
2500 rdev->raid_disk = slot;
2501 /* assume it is working */
2502 clear_bit(Faulty, &rdev->flags);
2503 clear_bit(WriteMostly, &rdev->flags);
2504 set_bit(In_sync, &rdev->flags);
2505 sysfs_notify_dirent_safe(rdev->sysfs_state);
2511 static struct rdev_sysfs_entry rdev_slot =
2512 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
2515 offset_show(mdk_rdev_t *rdev, char *page)
2517 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
2521 offset_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2524 unsigned long long offset = simple_strtoull(buf, &e, 10);
2525 if (e==buf || (*e && *e != '\n'))
2527 if (rdev->mddev->pers && rdev->raid_disk >= 0)
2529 if (rdev->sectors && rdev->mddev->external)
2530 /* Must set offset before size, so overlap checks
2533 rdev->data_offset = offset;
2537 static struct rdev_sysfs_entry rdev_offset =
2538 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
2541 rdev_size_show(mdk_rdev_t *rdev, char *page)
2543 return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2);
2546 static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
2548 /* check if two start/length pairs overlap */
2556 static int strict_blocks_to_sectors(const char *buf, sector_t *sectors)
2558 unsigned long long blocks;
2561 if (strict_strtoull(buf, 10, &blocks) < 0)
2564 if (blocks & 1ULL << (8 * sizeof(blocks) - 1))
2565 return -EINVAL; /* sector conversion overflow */
2568 if (new != blocks * 2)
2569 return -EINVAL; /* unsigned long long to sector_t overflow */
2576 rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2578 mddev_t *my_mddev = rdev->mddev;
2579 sector_t oldsectors = rdev->sectors;
2582 if (strict_blocks_to_sectors(buf, §ors) < 0)
2584 if (my_mddev->pers && rdev->raid_disk >= 0) {
2585 if (my_mddev->persistent) {
2586 sectors = super_types[my_mddev->major_version].
2587 rdev_size_change(rdev, sectors);
2590 } else if (!sectors)
2591 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) -
2594 if (sectors < my_mddev->dev_sectors)
2595 return -EINVAL; /* component must fit device */
2597 rdev->sectors = sectors;
2598 if (sectors > oldsectors && my_mddev->external) {
2599 /* need to check that all other rdevs with the same ->bdev
2600 * do not overlap. We need to unlock the mddev to avoid
2601 * a deadlock. We have already changed rdev->sectors, and if
2602 * we have to change it back, we will have the lock again.
2606 struct list_head *tmp;
2608 mddev_unlock(my_mddev);
2609 for_each_mddev(mddev, tmp) {
2613 list_for_each_entry(rdev2, &mddev->disks, same_set)
2614 if (test_bit(AllReserved, &rdev2->flags) ||
2615 (rdev->bdev == rdev2->bdev &&
2617 overlaps(rdev->data_offset, rdev->sectors,
2623 mddev_unlock(mddev);
2629 mddev_lock(my_mddev);
2631 /* Someone else could have slipped in a size
2632 * change here, but doing so is just silly.
2633 * We put oldsectors back because we *know* it is
2634 * safe, and trust userspace not to race with
2637 rdev->sectors = oldsectors;
2644 static struct rdev_sysfs_entry rdev_size =
2645 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
2648 static ssize_t recovery_start_show(mdk_rdev_t *rdev, char *page)
2650 unsigned long long recovery_start = rdev->recovery_offset;
2652 if (test_bit(In_sync, &rdev->flags) ||
2653 recovery_start == MaxSector)
2654 return sprintf(page, "none\n");
2656 return sprintf(page, "%llu\n", recovery_start);
2659 static ssize_t recovery_start_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2661 unsigned long long recovery_start;
2663 if (cmd_match(buf, "none"))
2664 recovery_start = MaxSector;
2665 else if (strict_strtoull(buf, 10, &recovery_start))
2668 if (rdev->mddev->pers &&
2669 rdev->raid_disk >= 0)
2672 rdev->recovery_offset = recovery_start;
2673 if (recovery_start == MaxSector)
2674 set_bit(In_sync, &rdev->flags);
2676 clear_bit(In_sync, &rdev->flags);
2680 static struct rdev_sysfs_entry rdev_recovery_start =
2681 __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store);
2683 static struct attribute *rdev_default_attrs[] = {
2689 &rdev_recovery_start.attr,
2693 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
2695 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2696 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
2697 mddev_t *mddev = rdev->mddev;
2703 rv = mddev ? mddev_lock(mddev) : -EBUSY;
2705 if (rdev->mddev == NULL)
2708 rv = entry->show(rdev, page);
2709 mddev_unlock(mddev);
2715 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
2716 const char *page, size_t length)
2718 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2719 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
2721 mddev_t *mddev = rdev->mddev;
2725 if (!capable(CAP_SYS_ADMIN))
2727 rv = mddev ? mddev_lock(mddev): -EBUSY;
2729 if (rdev->mddev == NULL)
2732 rv = entry->store(rdev, page, length);
2733 mddev_unlock(mddev);
2738 static void rdev_free(struct kobject *ko)
2740 mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj);
2743 static const struct sysfs_ops rdev_sysfs_ops = {
2744 .show = rdev_attr_show,
2745 .store = rdev_attr_store,
2747 static struct kobj_type rdev_ktype = {
2748 .release = rdev_free,
2749 .sysfs_ops = &rdev_sysfs_ops,
2750 .default_attrs = rdev_default_attrs,
2753 void md_rdev_init(mdk_rdev_t *rdev)
2756 rdev->saved_raid_disk = -1;
2757 rdev->raid_disk = -1;
2759 rdev->data_offset = 0;
2760 rdev->sb_events = 0;
2761 rdev->last_read_error.tv_sec = 0;
2762 rdev->last_read_error.tv_nsec = 0;
2763 atomic_set(&rdev->nr_pending, 0);
2764 atomic_set(&rdev->read_errors, 0);
2765 atomic_set(&rdev->corrected_errors, 0);
2767 INIT_LIST_HEAD(&rdev->same_set);
2768 init_waitqueue_head(&rdev->blocked_wait);
2770 EXPORT_SYMBOL_GPL(md_rdev_init);
2772 * Import a device. If 'super_format' >= 0, then sanity check the superblock
2774 * mark the device faulty if:
2776 * - the device is nonexistent (zero size)
2777 * - the device has no valid superblock
2779 * a faulty rdev _never_ has rdev->sb set.
2781 static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor)
2783 char b[BDEVNAME_SIZE];
2788 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
2790 printk(KERN_ERR "md: could not alloc mem for new device!\n");
2791 return ERR_PTR(-ENOMEM);
2795 if ((err = alloc_disk_sb(rdev)))
2798 err = lock_rdev(rdev, newdev, super_format == -2);
2802 kobject_init(&rdev->kobj, &rdev_ktype);
2804 size = i_size_read(rdev->bdev->bd_inode) >> BLOCK_SIZE_BITS;
2807 "md: %s has zero or unknown size, marking faulty!\n",
2808 bdevname(rdev->bdev,b));
2813 if (super_format >= 0) {
2814 err = super_types[super_format].
2815 load_super(rdev, NULL, super_minor);
2816 if (err == -EINVAL) {
2818 "md: %s does not have a valid v%d.%d "
2819 "superblock, not importing!\n",
2820 bdevname(rdev->bdev,b),
2821 super_format, super_minor);
2826 "md: could not read %s's sb, not importing!\n",
2827 bdevname(rdev->bdev,b));
2835 if (rdev->sb_page) {
2841 return ERR_PTR(err);
2845 * Check a full RAID array for plausibility
2849 static void analyze_sbs(mddev_t * mddev)
2852 mdk_rdev_t *rdev, *freshest, *tmp;
2853 char b[BDEVNAME_SIZE];
2856 rdev_for_each(rdev, tmp, mddev)
2857 switch (super_types[mddev->major_version].
2858 load_super(rdev, freshest, mddev->minor_version)) {
2866 "md: fatal superblock inconsistency in %s"
2867 " -- removing from array\n",
2868 bdevname(rdev->bdev,b));
2869 kick_rdev_from_array(rdev);
2873 super_types[mddev->major_version].
2874 validate_super(mddev, freshest);
2877 rdev_for_each(rdev, tmp, mddev) {
2878 if (mddev->max_disks &&
2879 (rdev->desc_nr >= mddev->max_disks ||
2880 i > mddev->max_disks)) {
2882 "md: %s: %s: only %d devices permitted\n",
2883 mdname(mddev), bdevname(rdev->bdev, b),
2885 kick_rdev_from_array(rdev);
2888 if (rdev != freshest)
2889 if (super_types[mddev->major_version].
2890 validate_super(mddev, rdev)) {
2891 printk(KERN_WARNING "md: kicking non-fresh %s"
2893 bdevname(rdev->bdev,b));
2894 kick_rdev_from_array(rdev);
2897 if (mddev->level == LEVEL_MULTIPATH) {
2898 rdev->desc_nr = i++;
2899 rdev->raid_disk = rdev->desc_nr;
2900 set_bit(In_sync, &rdev->flags);
2901 } else if (rdev->raid_disk >= (mddev->raid_disks - min(0, mddev->delta_disks))) {
2902 rdev->raid_disk = -1;
2903 clear_bit(In_sync, &rdev->flags);
2908 /* Read a fixed-point number.
2909 * Numbers in sysfs attributes should be in "standard" units where
2910 * possible, so time should be in seconds.
2911 * However we internally use a a much smaller unit such as
2912 * milliseconds or jiffies.
2913 * This function takes a decimal number with a possible fractional
2914 * component, and produces an integer which is the result of
2915 * multiplying that number by 10^'scale'.
2916 * all without any floating-point arithmetic.
2918 int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale)
2920 unsigned long result = 0;
2922 while (isdigit(*cp) || (*cp == '.' && decimals < 0)) {
2925 else if (decimals < scale) {
2928 result = result * 10 + value;
2940 while (decimals < scale) {
2949 static void md_safemode_timeout(unsigned long data);
2952 safe_delay_show(mddev_t *mddev, char *page)
2954 int msec = (mddev->safemode_delay*1000)/HZ;
2955 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
2958 safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len)
2962 if (strict_strtoul_scaled(cbuf, &msec, 3) < 0)
2965 mddev->safemode_delay = 0;
2967 unsigned long old_delay = mddev->safemode_delay;
2968 mddev->safemode_delay = (msec*HZ)/1000;
2969 if (mddev->safemode_delay == 0)
2970 mddev->safemode_delay = 1;
2971 if (mddev->safemode_delay < old_delay)
2972 md_safemode_timeout((unsigned long)mddev);
2976 static struct md_sysfs_entry md_safe_delay =
2977 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
2980 level_show(mddev_t *mddev, char *page)
2982 struct mdk_personality *p = mddev->pers;
2984 return sprintf(page, "%s\n", p->name);
2985 else if (mddev->clevel[0])
2986 return sprintf(page, "%s\n", mddev->clevel);
2987 else if (mddev->level != LEVEL_NONE)
2988 return sprintf(page, "%d\n", mddev->level);
2994 level_store(mddev_t *mddev, const char *buf, size_t len)
2998 struct mdk_personality *pers;
3003 if (mddev->pers == NULL) {
3006 if (len >= sizeof(mddev->clevel))
3008 strncpy(mddev->clevel, buf, len);
3009 if (mddev->clevel[len-1] == '\n')
3011 mddev->clevel[len] = 0;
3012 mddev->level = LEVEL_NONE;
3016 /* request to change the personality. Need to ensure:
3017 * - array is not engaged in resync/recovery/reshape
3018 * - old personality can be suspended
3019 * - new personality will access other array.
3022 if (mddev->sync_thread ||
3023 mddev->reshape_position != MaxSector ||
3024 mddev->sysfs_active)
3027 if (!mddev->pers->quiesce) {
3028 printk(KERN_WARNING "md: %s: %s does not support online personality change\n",
3029 mdname(mddev), mddev->pers->name);
3033 /* Now find the new personality */
3034 if (len == 0 || len >= sizeof(clevel))
3036 strncpy(clevel, buf, len);
3037 if (clevel[len-1] == '\n')
3040 if (strict_strtol(clevel, 10, &level))
3043 if (request_module("md-%s", clevel) != 0)
3044 request_module("md-level-%s", clevel);
3045 spin_lock(&pers_lock);
3046 pers = find_pers(level, clevel);
3047 if (!pers || !try_module_get(pers->owner)) {
3048 spin_unlock(&pers_lock);
3049 printk(KERN_WARNING "md: personality %s not loaded\n", clevel);
3052 spin_unlock(&pers_lock);
3054 if (pers == mddev->pers) {
3055 /* Nothing to do! */
3056 module_put(pers->owner);
3059 if (!pers->takeover) {
3060 module_put(pers->owner);
3061 printk(KERN_WARNING "md: %s: %s does not support personality takeover\n",
3062 mdname(mddev), clevel);
3066 list_for_each_entry(rdev, &mddev->disks, same_set)
3067 rdev->new_raid_disk = rdev->raid_disk;
3069 /* ->takeover must set new_* and/or delta_disks
3070 * if it succeeds, and may set them when it fails.
3072 priv = pers->takeover(mddev);
3074 mddev->new_level = mddev->level;
3075 mddev->new_layout = mddev->layout;
3076 mddev->new_chunk_sectors = mddev->chunk_sectors;
3077 mddev->raid_disks -= mddev->delta_disks;
3078 mddev->delta_disks = 0;
3079 module_put(pers->owner);
3080 printk(KERN_WARNING "md: %s: %s would not accept array\n",
3081 mdname(mddev), clevel);
3082 return PTR_ERR(priv);
3085 /* Looks like we have a winner */
3086 mddev_suspend(mddev);
3087 mddev->pers->stop(mddev);
3089 if (mddev->pers->sync_request == NULL &&
3090 pers->sync_request != NULL) {
3091 /* need to add the md_redundancy_group */
3092 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
3094 "md: cannot register extra attributes for %s\n",
3096 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, NULL, "sync_action");
3098 if (mddev->pers->sync_request != NULL &&
3099 pers->sync_request == NULL) {
3100 /* need to remove the md_redundancy_group */
3101 if (mddev->to_remove == NULL)
3102 mddev->to_remove = &md_redundancy_group;
3105 if (mddev->pers->sync_request == NULL &&
3107 /* We are converting from a no-redundancy array
3108 * to a redundancy array and metadata is managed
3109 * externally so we need to be sure that writes
3110 * won't block due to a need to transition
3112 * until external management is started.
3115 mddev->safemode_delay = 0;
3116 mddev->safemode = 0;
3119 list_for_each_entry(rdev, &mddev->disks, same_set) {
3121 if (rdev->raid_disk < 0)
3123 if (rdev->new_raid_disk > mddev->raid_disks)
3124 rdev->new_raid_disk = -1;
3125 if (rdev->new_raid_disk == rdev->raid_disk)
3127 sprintf(nm, "rd%d", rdev->raid_disk);
3128 sysfs_remove_link(&mddev->kobj, nm);
3130 list_for_each_entry(rdev, &mddev->disks, same_set) {
3131 if (rdev->raid_disk < 0)
3133 if (rdev->new_raid_disk == rdev->raid_disk)
3135 rdev->raid_disk = rdev->new_raid_disk;
3136 if (rdev->raid_disk < 0)
3137 clear_bit(In_sync, &rdev->flags);
3140 sprintf(nm, "rd%d", rdev->raid_disk);
3141 if(sysfs_create_link(&mddev->kobj, &rdev->kobj, nm))
3142 printk("md: cannot register %s for %s after level change\n",
3147 module_put(mddev->pers->owner);
3149 mddev->private = priv;
3150 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
3151 mddev->level = mddev->new_level;
3152 mddev->layout = mddev->new_layout;
3153 mddev->chunk_sectors = mddev->new_chunk_sectors;
3154 mddev->delta_disks = 0;
3155 if (mddev->pers->sync_request == NULL) {
3156 /* this is now an array without redundancy, so
3157 * it must always be in_sync
3160 del_timer_sync(&mddev->safemode_timer);
3163 mddev_resume(mddev);
3164 set_bit(MD_CHANGE_DEVS, &mddev->flags);
3165 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3166 md_wakeup_thread(mddev->thread);
3167 sysfs_notify(&mddev->kobj, NULL, "level");
3168 md_new_event(mddev);
3172 static struct md_sysfs_entry md_level =
3173 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
3177 layout_show(mddev_t *mddev, char *page)
3179 /* just a number, not meaningful for all levels */
3180 if (mddev->reshape_position != MaxSector &&
3181 mddev->layout != mddev->new_layout)
3182 return sprintf(page, "%d (%d)\n",
3183 mddev->new_layout, mddev->layout);
3184 return sprintf(page, "%d\n", mddev->layout);
3188 layout_store(mddev_t *mddev, const char *buf, size_t len)
3191 unsigned long n = simple_strtoul(buf, &e, 10);
3193 if (!*buf || (*e && *e != '\n'))
3198 if (mddev->pers->check_reshape == NULL)
3200 mddev->new_layout = n;
3201 err = mddev->pers->check_reshape(mddev);
3203 mddev->new_layout = mddev->layout;
3207 mddev->new_layout = n;
3208 if (mddev->reshape_position == MaxSector)
3213 static struct md_sysfs_entry md_layout =
3214 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
3218 raid_disks_show(mddev_t *mddev, char *page)
3220 if (mddev->raid_disks == 0)
3222 if (mddev->reshape_position != MaxSector &&
3223 mddev->delta_disks != 0)
3224 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
3225 mddev->raid_disks - mddev->delta_disks);
3226 return sprintf(page, "%d\n", mddev->raid_disks);
3229 static int update_raid_disks(mddev_t *mddev, int raid_disks);
3232 raid_disks_store(mddev_t *mddev, const char *buf, size_t len)
3236 unsigned long n = simple_strtoul(buf, &e, 10);
3238 if (!*buf || (*e && *e != '\n'))
3242 rv = update_raid_disks(mddev, n);
3243 else if (mddev->reshape_position != MaxSector) {
3244 int olddisks = mddev->raid_disks - mddev->delta_disks;
3245 mddev->delta_disks = n - olddisks;
3246 mddev->raid_disks = n;
3248 mddev->raid_disks = n;
3249 return rv ? rv : len;
3251 static struct md_sysfs_entry md_raid_disks =
3252 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
3255 chunk_size_show(mddev_t *mddev, char *page)
3257 if (mddev->reshape_position != MaxSector &&
3258 mddev->chunk_sectors != mddev->new_chunk_sectors)
3259 return sprintf(page, "%d (%d)\n",
3260 mddev->new_chunk_sectors << 9,
3261 mddev->chunk_sectors << 9);
3262 return sprintf(page, "%d\n", mddev->chunk_sectors << 9);
3266 chunk_size_store(mddev_t *mddev, const char *buf, size_t len)
3269 unsigned long n = simple_strtoul(buf, &e, 10);
3271 if (!*buf || (*e && *e != '\n'))
3276 if (mddev->pers->check_reshape == NULL)
3278 mddev->new_chunk_sectors = n >> 9;
3279 err = mddev->pers->check_reshape(mddev);
3281 mddev->new_chunk_sectors = mddev->chunk_sectors;
3285 mddev->new_chunk_sectors = n >> 9;
3286 if (mddev->reshape_position == MaxSector)
3287 mddev->chunk_sectors = n >> 9;
3291 static struct md_sysfs_entry md_chunk_size =
3292 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
3295 resync_start_show(mddev_t *mddev, char *page)
3297 if (mddev->recovery_cp == MaxSector)
3298 return sprintf(page, "none\n");
3299 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
3303 resync_start_store(mddev_t *mddev, const char *buf, size_t len)
3306 unsigned long long n = simple_strtoull(buf, &e, 10);
3310 if (cmd_match(buf, "none"))
3312 else if (!*buf || (*e && *e != '\n'))
3315 mddev->recovery_cp = n;
3318 static struct md_sysfs_entry md_resync_start =
3319 __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store);
3322 * The array state can be:
3325 * No devices, no size, no level
3326 * Equivalent to STOP_ARRAY ioctl
3328 * May have some settings, but array is not active
3329 * all IO results in error
3330 * When written, doesn't tear down array, but just stops it
3331 * suspended (not supported yet)
3332 * All IO requests will block. The array can be reconfigured.
3333 * Writing this, if accepted, will block until array is quiescent
3335 * no resync can happen. no superblocks get written.
3336 * write requests fail
3338 * like readonly, but behaves like 'clean' on a write request.
3340 * clean - no pending writes, but otherwise active.
3341 * When written to inactive array, starts without resync
3342 * If a write request arrives then
3343 * if metadata is known, mark 'dirty' and switch to 'active'.
3344 * if not known, block and switch to write-pending
3345 * If written to an active array that has pending writes, then fails.
3347 * fully active: IO and resync can be happening.
3348 * When written to inactive array, starts with resync
3351 * clean, but writes are blocked waiting for 'active' to be written.
3354 * like active, but no writes have been seen for a while (100msec).
3357 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
3358 write_pending, active_idle, bad_word};
3359 static char *array_states[] = {
3360 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3361 "write-pending", "active-idle", NULL };
3363 static int match_word(const char *word, char **list)
3366 for (n=0; list[n]; n++)
3367 if (cmd_match(word, list[n]))
3373 array_state_show(mddev_t *mddev, char *page)
3375 enum array_state st = inactive;
3388 else if (test_bit(MD_CHANGE_PENDING, &mddev->flags))
3390 else if (mddev->safemode)
3396 if (list_empty(&mddev->disks) &&
3397 mddev->raid_disks == 0 &&
3398 mddev->dev_sectors == 0)
3403 return sprintf(page, "%s\n", array_states[st]);
3406 static int do_md_stop(mddev_t * mddev, int ro, int is_open);
3407 static int md_set_readonly(mddev_t * mddev, int is_open);
3408 static int do_md_run(mddev_t * mddev);
3409 static int restart_array(mddev_t *mddev);
3412 array_state_store(mddev_t *mddev, const char *buf, size_t len)
3415 enum array_state st = match_word(buf, array_states);
3420 /* stopping an active array */
3421 if (atomic_read(&mddev->openers) > 0)
3423 err = do_md_stop(mddev, 0, 0);
3426 /* stopping an active array */
3428 if (atomic_read(&mddev->openers) > 0)
3430 err = do_md_stop(mddev, 2, 0);
3432 err = 0; /* already inactive */
3435 break; /* not supported yet */
3438 err = md_set_readonly(mddev, 0);
3441 set_disk_ro(mddev->gendisk, 1);
3442 err = do_md_run(mddev);
3448 err = md_set_readonly(mddev, 0);
3449 else if (mddev->ro == 1)
3450 err = restart_array(mddev);
3453 set_disk_ro(mddev->gendisk, 0);
3457 err = do_md_run(mddev);
3462 restart_array(mddev);
3463 spin_lock_irq(&mddev->write_lock);
3464 if (atomic_read(&mddev->writes_pending) == 0) {
3465 if (mddev->in_sync == 0) {
3467 if (mddev->safemode == 1)
3468 mddev->safemode = 0;
3469 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
3474 spin_unlock_irq(&mddev->write_lock);
3480 restart_array(mddev);
3481 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
3482 wake_up(&mddev->sb_wait);
3486 set_disk_ro(mddev->gendisk, 0);
3487 err = do_md_run(mddev);
3492 /* these cannot be set */
3498 sysfs_notify_dirent_safe(mddev->sysfs_state);
3502 static struct md_sysfs_entry md_array_state =
3503 __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
3506 max_corrected_read_errors_show(mddev_t *mddev, char *page) {
3507 return sprintf(page, "%d\n",
3508 atomic_read(&mddev->max_corr_read_errors));
3512 max_corrected_read_errors_store(mddev_t *mddev, const char *buf, size_t len)
3515 unsigned long n = simple_strtoul(buf, &e, 10);
3517 if (*buf && (*e == 0 || *e == '\n')) {
3518 atomic_set(&mddev->max_corr_read_errors, n);
3524 static struct md_sysfs_entry max_corr_read_errors =
3525 __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show,
3526 max_corrected_read_errors_store);
3529 null_show(mddev_t *mddev, char *page)
3535 new_dev_store(mddev_t *mddev, const char *buf, size_t len)
3537 /* buf must be %d:%d\n? giving major and minor numbers */
3538 /* The new device is added to the array.
3539 * If the array has a persistent superblock, we read the
3540 * superblock to initialise info and check validity.
3541 * Otherwise, only checking done is that in bind_rdev_to_array,
3542 * which mainly checks size.
3545 int major = simple_strtoul(buf, &e, 10);
3551 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
3553 minor = simple_strtoul(e+1, &e, 10);
3554 if (*e && *e != '\n')
3556 dev = MKDEV(major, minor);
3557 if (major != MAJOR(dev) ||
3558 minor != MINOR(dev))
3562 if (mddev->persistent) {
3563 rdev = md_import_device(dev, mddev->major_version,
3564 mddev->minor_version);
3565 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
3566 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
3567 mdk_rdev_t, same_set);
3568 err = super_types[mddev->major_version]
3569 .load_super(rdev, rdev0, mddev->minor_version);
3573 } else if (mddev->external)
3574 rdev = md_import_device(dev, -2, -1);
3576 rdev = md_import_device(dev, -1, -1);
3579 return PTR_ERR(rdev);
3580 err = bind_rdev_to_array(rdev, mddev);
3584 return err ? err : len;
3587 static struct md_sysfs_entry md_new_device =
3588 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
3591 bitmap_store(mddev_t *mddev, const char *buf, size_t len)
3594 unsigned long chunk, end_chunk;
3598 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
3600 chunk = end_chunk = simple_strtoul(buf, &end, 0);
3601 if (buf == end) break;
3602 if (*end == '-') { /* range */
3604 end_chunk = simple_strtoul(buf, &end, 0);
3605 if (buf == end) break;
3607 if (*end && !isspace(*end)) break;
3608 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
3609 buf = skip_spaces(end);
3611 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
3616 static struct md_sysfs_entry md_bitmap =
3617 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
3620 size_show(mddev_t *mddev, char *page)
3622 return sprintf(page, "%llu\n",
3623 (unsigned long long)mddev->dev_sectors / 2);
3626 static int update_size(mddev_t *mddev, sector_t num_sectors);
3629 size_store(mddev_t *mddev, const char *buf, size_t len)
3631 /* If array is inactive, we can reduce the component size, but
3632 * not increase it (except from 0).
3633 * If array is active, we can try an on-line resize
3636 int err = strict_blocks_to_sectors(buf, §ors);
3641 err = update_size(mddev, sectors);
3642 md_update_sb(mddev, 1);
3644 if (mddev->dev_sectors == 0 ||
3645 mddev->dev_sectors > sectors)
3646 mddev->dev_sectors = sectors;
3650 return err ? err : len;
3653 static struct md_sysfs_entry md_size =
3654 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
3659 * 'none' for arrays with no metadata (good luck...)
3660 * 'external' for arrays with externally managed metadata,
3661 * or N.M for internally known formats
3664 metadata_show(mddev_t *mddev, char *page)
3666 if (mddev->persistent)
3667 return sprintf(page, "%d.%d\n",
3668 mddev->major_version, mddev->minor_version);
3669 else if (mddev->external)
3670 return sprintf(page, "external:%s\n", mddev->metadata_type);
3672 return sprintf(page, "none\n");
3676 metadata_store(mddev_t *mddev, const char *buf, size_t len)
3680 /* Changing the details of 'external' metadata is
3681 * always permitted. Otherwise there must be
3682 * no devices attached to the array.
3684 if (mddev->external && strncmp(buf, "external:", 9) == 0)
3686 else if (!list_empty(&mddev->disks))
3689 if (cmd_match(buf, "none")) {
3690 mddev->persistent = 0;
3691 mddev->external = 0;
3692 mddev->major_version = 0;
3693 mddev->minor_version = 90;
3696 if (strncmp(buf, "external:", 9) == 0) {
3697 size_t namelen = len-9;
3698 if (namelen >= sizeof(mddev->metadata_type))
3699 namelen = sizeof(mddev->metadata_type)-1;
3700 strncpy(mddev->metadata_type, buf+9, namelen);
3701 mddev->metadata_type[namelen] = 0;
3702 if (namelen && mddev->metadata_type[namelen-1] == '\n')
3703 mddev->metadata_type[--namelen] = 0;
3704 mddev->persistent = 0;
3705 mddev->external = 1;
3706 mddev->major_version = 0;
3707 mddev->minor_version = 90;
3710 major = simple_strtoul(buf, &e, 10);
3711 if (e==buf || *e != '.')
3714 minor = simple_strtoul(buf, &e, 10);
3715 if (e==buf || (*e && *e != '\n') )
3717 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
3719 mddev->major_version = major;
3720 mddev->minor_version = minor;
3721 mddev->persistent = 1;
3722 mddev->external = 0;
3726 static struct md_sysfs_entry md_metadata =
3727 __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
3730 action_show(mddev_t *mddev, char *page)
3732 char *type = "idle";
3733 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
3735 else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3736 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) {
3737 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
3739 else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
3740 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
3742 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
3746 } else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
3749 return sprintf(page, "%s\n", type);
3752 static void reap_sync_thread(mddev_t *mddev);
3755 action_store(mddev_t *mddev, const char *page, size_t len)
3757 if (!mddev->pers || !mddev->pers->sync_request)
3760 if (cmd_match(page, "frozen"))
3761 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3763 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3765 if (cmd_match(page, "idle") || cmd_match(page, "frozen")) {
3766 if (mddev->sync_thread) {
3767 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
3768 reap_sync_thread(mddev);
3770 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3771 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
3773 else if (cmd_match(page, "resync"))
3774 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3775 else if (cmd_match(page, "recover")) {
3776 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
3777 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3778 } else if (cmd_match(page, "reshape")) {
3780 if (mddev->pers->start_reshape == NULL)
3782 err = mddev->pers->start_reshape(mddev);
3785 sysfs_notify(&mddev->kobj, NULL, "degraded");
3787 if (cmd_match(page, "check"))
3788 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
3789 else if (!cmd_match(page, "repair"))
3791 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
3792 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
3794 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3795 md_wakeup_thread(mddev->thread);
3796 sysfs_notify_dirent_safe(mddev->sysfs_action);
3801 mismatch_cnt_show(mddev_t *mddev, char *page)
3803 return sprintf(page, "%llu\n",
3804 (unsigned long long) mddev->resync_mismatches);
3807 static struct md_sysfs_entry md_scan_mode =
3808 __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
3811 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
3814 sync_min_show(mddev_t *mddev, char *page)
3816 return sprintf(page, "%d (%s)\n", speed_min(mddev),
3817 mddev->sync_speed_min ? "local": "system");
3821 sync_min_store(mddev_t *mddev, const char *buf, size_t len)
3825 if (strncmp(buf, "system", 6)==0) {
3826 mddev->sync_speed_min = 0;
3829 min = simple_strtoul(buf, &e, 10);
3830 if (buf == e || (*e && *e != '\n') || min <= 0)
3832 mddev->sync_speed_min = min;
3836 static struct md_sysfs_entry md_sync_min =
3837 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
3840 sync_max_show(mddev_t *mddev, char *page)
3842 return sprintf(page, "%d (%s)\n", speed_max(mddev),
3843 mddev->sync_speed_max ? "local": "system");
3847 sync_max_store(mddev_t *mddev, const char *buf, size_t len)
3851 if (strncmp(buf, "system", 6)==0) {
3852 mddev->sync_speed_max = 0;
3855 max = simple_strtoul(buf, &e, 10);
3856 if (buf == e || (*e && *e != '\n') || max <= 0)
3858 mddev->sync_speed_max = max;
3862 static struct md_sysfs_entry md_sync_max =
3863 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
3866 degraded_show(mddev_t *mddev, char *page)
3868 return sprintf(page, "%d\n", mddev->degraded);
3870 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
3873 sync_force_parallel_show(mddev_t *mddev, char *page)
3875 return sprintf(page, "%d\n", mddev->parallel_resync);
3879 sync_force_parallel_store(mddev_t *mddev, const char *buf, size_t len)
3883 if (strict_strtol(buf, 10, &n))
3886 if (n != 0 && n != 1)
3889 mddev->parallel_resync = n;
3891 if (mddev->sync_thread)
3892 wake_up(&resync_wait);
3897 /* force parallel resync, even with shared block devices */
3898 static struct md_sysfs_entry md_sync_force_parallel =
3899 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
3900 sync_force_parallel_show, sync_force_parallel_store);
3903 sync_speed_show(mddev_t *mddev, char *page)
3905 unsigned long resync, dt, db;
3906 if (mddev->curr_resync == 0)
3907 return sprintf(page, "none\n");
3908 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
3909 dt = (jiffies - mddev->resync_mark) / HZ;
3911 db = resync - mddev->resync_mark_cnt;
3912 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
3915 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
3918 sync_completed_show(mddev_t *mddev, char *page)
3920 unsigned long max_sectors, resync;
3922 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3923 return sprintf(page, "none\n");
3925 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
3926 max_sectors = mddev->resync_max_sectors;
3928 max_sectors = mddev->dev_sectors;
3930 resync = mddev->curr_resync_completed;
3931 return sprintf(page, "%lu / %lu\n", resync, max_sectors);
3934 static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed);
3937 min_sync_show(mddev_t *mddev, char *page)
3939 return sprintf(page, "%llu\n",
3940 (unsigned long long)mddev->resync_min);
3943 min_sync_store(mddev_t *mddev, const char *buf, size_t len)
3945 unsigned long long min;
3946 if (strict_strtoull(buf, 10, &min))
3948 if (min > mddev->resync_max)
3950 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3953 /* Must be a multiple of chunk_size */
3954 if (mddev->chunk_sectors) {
3955 sector_t temp = min;
3956 if (sector_div(temp, mddev->chunk_sectors))
3959 mddev->resync_min = min;
3964 static struct md_sysfs_entry md_min_sync =
3965 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
3968 max_sync_show(mddev_t *mddev, char *page)
3970 if (mddev->resync_max == MaxSector)
3971 return sprintf(page, "max\n");
3973 return sprintf(page, "%llu\n",
3974 (unsigned long long)mddev->resync_max);
3977 max_sync_store(mddev_t *mddev, const char *buf, size_t len)
3979 if (strncmp(buf, "max", 3) == 0)
3980 mddev->resync_max = MaxSector;
3982 unsigned long long max;
3983 if (strict_strtoull(buf, 10, &max))
3985 if (max < mddev->resync_min)
3987 if (max < mddev->resync_max &&
3989 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3992 /* Must be a multiple of chunk_size */
3993 if (mddev->chunk_sectors) {
3994 sector_t temp = max;
3995 if (sector_div(temp, mddev->chunk_sectors))
3998 mddev->resync_max = max;
4000 wake_up(&mddev->recovery_wait);
4004 static struct md_sysfs_entry md_max_sync =
4005 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
4008 suspend_lo_show(mddev_t *mddev, char *page)
4010 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
4014 suspend_lo_store(mddev_t *mddev, const char *buf, size_t len)
4017 unsigned long long new = simple_strtoull(buf, &e, 10);
4019 if (mddev->pers == NULL ||
4020 mddev->pers->quiesce == NULL)
4022 if (buf == e || (*e && *e != '\n'))
4024 if (new >= mddev->suspend_hi ||
4025 (new > mddev->suspend_lo && new < mddev->suspend_hi)) {
4026 mddev->suspend_lo = new;
4027 mddev->pers->quiesce(mddev, 2);
4032 static struct md_sysfs_entry md_suspend_lo =
4033 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
4037 suspend_hi_show(mddev_t *mddev, char *page)
4039 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
4043 suspend_hi_store(mddev_t *mddev, const char *buf, size_t len)
4046 unsigned long long new = simple_strtoull(buf, &e, 10);
4048 if (mddev->pers == NULL ||
4049 mddev->pers->quiesce == NULL)
4051 if (buf == e || (*e && *e != '\n'))
4053 if ((new <= mddev->suspend_lo && mddev->suspend_lo >= mddev->suspend_hi) ||
4054 (new > mddev->suspend_lo && new > mddev->suspend_hi)) {
4055 mddev->suspend_hi = new;
4056 mddev->pers->quiesce(mddev, 1);
4057 mddev->pers->quiesce(mddev, 0);
4062 static struct md_sysfs_entry md_suspend_hi =
4063 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
4066 reshape_position_show(mddev_t *mddev, char *page)
4068 if (mddev->reshape_position != MaxSector)
4069 return sprintf(page, "%llu\n",
4070 (unsigned long long)mddev->reshape_position);
4071 strcpy(page, "none\n");
4076 reshape_position_store(mddev_t *mddev, const char *buf, size_t len)
4079 unsigned long long new = simple_strtoull(buf, &e, 10);
4082 if (buf == e || (*e && *e != '\n'))
4084 mddev->reshape_position = new;
4085 mddev->delta_disks = 0;
4086 mddev->new_level = mddev->level;
4087 mddev->new_layout = mddev->layout;
4088 mddev->new_chunk_sectors = mddev->chunk_sectors;
4092 static struct md_sysfs_entry md_reshape_position =
4093 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
4094 reshape_position_store);
4097 array_size_show(mddev_t *mddev, char *page)
4099 if (mddev->external_size)
4100 return sprintf(page, "%llu\n",
4101 (unsigned long long)mddev->array_sectors/2);
4103 return sprintf(page, "default\n");
4107 array_size_store(mddev_t *mddev, const char *buf, size_t len)
4111 if (strncmp(buf, "default", 7) == 0) {
4113 sectors = mddev->pers->size(mddev, 0, 0);
4115 sectors = mddev->array_sectors;
4117 mddev->external_size = 0;
4119 if (strict_blocks_to_sectors(buf, §ors) < 0)
4121 if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors)
4124 mddev->external_size = 1;
4127 mddev->array_sectors = sectors;
4128 set_capacity(mddev->gendisk, mddev->array_sectors);
4130 revalidate_disk(mddev->gendisk);
4135 static struct md_sysfs_entry md_array_size =
4136 __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show,
4139 static struct attribute *md_default_attrs[] = {
4142 &md_raid_disks.attr,
4143 &md_chunk_size.attr,
4145 &md_resync_start.attr,
4147 &md_new_device.attr,
4148 &md_safe_delay.attr,
4149 &md_array_state.attr,
4150 &md_reshape_position.attr,
4151 &md_array_size.attr,
4152 &max_corr_read_errors.attr,
4156 static struct attribute *md_redundancy_attrs[] = {
4158 &md_mismatches.attr,
4161 &md_sync_speed.attr,
4162 &md_sync_force_parallel.attr,
4163 &md_sync_completed.attr,
4166 &md_suspend_lo.attr,
4167 &md_suspend_hi.attr,
4172 static struct attribute_group md_redundancy_group = {
4174 .attrs = md_redundancy_attrs,
4179 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
4181 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
4182 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
4187 rv = mddev_lock(mddev);
4189 rv = entry->show(mddev, page);
4190 mddev_unlock(mddev);
4196 md_attr_store(struct kobject *kobj, struct attribute *attr,
4197 const char *page, size_t length)
4199 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
4200 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
4205 if (!capable(CAP_SYS_ADMIN))
4207 rv = mddev_lock(mddev);
4208 if (mddev->hold_active == UNTIL_IOCTL)
4209 mddev->hold_active = 0;
4211 rv = entry->store(mddev, page, length);
4212 mddev_unlock(mddev);
4217 static void md_free(struct kobject *ko)
4219 mddev_t *mddev = container_of(ko, mddev_t, kobj);
4221 if (mddev->sysfs_state)
4222 sysfs_put(mddev->sysfs_state);
4224 if (mddev->gendisk) {
4225 del_gendisk(mddev->gendisk);
4226 put_disk(mddev->gendisk);
4229 blk_cleanup_queue(mddev->queue);
4234 static const struct sysfs_ops md_sysfs_ops = {
4235 .show = md_attr_show,
4236 .store = md_attr_store,
4238 static struct kobj_type md_ktype = {
4240 .sysfs_ops = &md_sysfs_ops,
4241 .default_attrs = md_default_attrs,
4246 static void mddev_delayed_delete(struct work_struct *ws)
4248 mddev_t *mddev = container_of(ws, mddev_t, del_work);
4250 sysfs_remove_group(&mddev->kobj, &md_bitmap_group);
4251 kobject_del(&mddev->kobj);
4252 kobject_put(&mddev->kobj);
4255 static int md_alloc(dev_t dev, char *name)
4257 static DEFINE_MUTEX(disks_mutex);
4258 mddev_t *mddev = mddev_find(dev);
4259 struct gendisk *disk;
4268 partitioned = (MAJOR(mddev->unit) != MD_MAJOR);
4269 shift = partitioned ? MdpMinorShift : 0;
4270 unit = MINOR(mddev->unit) >> shift;
4272 /* wait for any previous instance of this device to be
4273 * completely removed (mddev_delayed_delete).
4275 flush_workqueue(md_misc_wq);
4277 mutex_lock(&disks_mutex);
4283 /* Need to ensure that 'name' is not a duplicate.
4286 spin_lock(&all_mddevs_lock);
4288 list_for_each_entry(mddev2, &all_mddevs, all_mddevs)
4289 if (mddev2->gendisk &&
4290 strcmp(mddev2->gendisk->disk_name, name) == 0) {
4291 spin_unlock(&all_mddevs_lock);
4294 spin_unlock(&all_mddevs_lock);
4298 mddev->queue = blk_alloc_queue(GFP_KERNEL);
4301 mddev->queue->queuedata = mddev;
4303 blk_queue_make_request(mddev->queue, md_make_request);
4305 disk = alloc_disk(1 << shift);
4307 blk_cleanup_queue(mddev->queue);
4308 mddev->queue = NULL;
4311 disk->major = MAJOR(mddev->unit);
4312 disk->first_minor = unit << shift;
4314 strcpy(disk->disk_name, name);
4315 else if (partitioned)
4316 sprintf(disk->disk_name, "md_d%d", unit);
4318 sprintf(disk->disk_name, "md%d", unit);
4319 disk->fops = &md_fops;
4320 disk->private_data = mddev;
4321 disk->queue = mddev->queue;
4322 /* Allow extended partitions. This makes the
4323 * 'mdp' device redundant, but we can't really
4326 disk->flags |= GENHD_FL_EXT_DEVT;
4328 mddev->gendisk = disk;
4329 error = kobject_init_and_add(&mddev->kobj, &md_ktype,
4330 &disk_to_dev(disk)->kobj, "%s", "md");
4332 /* This isn't possible, but as kobject_init_and_add is marked
4333 * __must_check, we must do something with the result
4335 printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
4339 if (mddev->kobj.sd &&
4340 sysfs_create_group(&mddev->kobj, &md_bitmap_group))
4341 printk(KERN_DEBUG "pointless warning\n");
4343 blk_queue_flush(mddev->queue, REQ_FLUSH | REQ_FUA);
4345 mutex_unlock(&disks_mutex);
4346 if (!error && mddev->kobj.sd) {
4347 kobject_uevent(&mddev->kobj, KOBJ_ADD);
4348 mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state");
4354 static struct kobject *md_probe(dev_t dev, int *part, void *data)
4356 md_alloc(dev, NULL);
4360 static int add_named_array(const char *val, struct kernel_param *kp)
4362 /* val must be "md_*" where * is not all digits.
4363 * We allocate an array with a large free minor number, and
4364 * set the name to val. val must not already be an active name.
4366 int len = strlen(val);
4367 char buf[DISK_NAME_LEN];
4369 while (len && val[len-1] == '\n')
4371 if (len >= DISK_NAME_LEN)
4373 strlcpy(buf, val, len+1);
4374 if (strncmp(buf, "md_", 3) != 0)
4376 return md_alloc(0, buf);
4379 static void md_safemode_timeout(unsigned long data)
4381 mddev_t *mddev = (mddev_t *) data;
4383 if (!atomic_read(&mddev->writes_pending)) {
4384 mddev->safemode = 1;
4385 if (mddev->external)
4386 sysfs_notify_dirent_safe(mddev->sysfs_state);
4388 md_wakeup_thread(mddev->thread);
4391 static int start_dirty_degraded;
4393 int md_run(mddev_t *mddev)
4397 struct mdk_personality *pers;
4399 if (list_empty(&mddev->disks))
4400 /* cannot run an array with no devices.. */
4405 /* Cannot run until previous stop completes properly */
4406 if (mddev->sysfs_active)
4410 * Analyze all RAID superblock(s)
4412 if (!mddev->raid_disks) {
4413 if (!mddev->persistent)
4418 if (mddev->level != LEVEL_NONE)
4419 request_module("md-level-%d", mddev->level);
4420 else if (mddev->clevel[0])
4421 request_module("md-%s", mddev->clevel);
4424 * Drop all container device buffers, from now on
4425 * the only valid external interface is through the md
4428 list_for_each_entry(rdev, &mddev->disks, same_set) {
4429 if (test_bit(Faulty, &rdev->flags))
4431 sync_blockdev(rdev->bdev);
4432 invalidate_bdev(rdev->bdev);
4434 /* perform some consistency tests on the device.
4435 * We don't want the data to overlap the metadata,
4436 * Internal Bitmap issues have been handled elsewhere.
4438 if (rdev->data_offset < rdev->sb_start) {
4439 if (mddev->dev_sectors &&
4440 rdev->data_offset + mddev->dev_sectors
4442 printk("md: %s: data overlaps metadata\n",
4447 if (rdev->sb_start + rdev->sb_size/512
4448 > rdev->data_offset) {
4449 printk("md: %s: metadata overlaps data\n",
4454 sysfs_notify_dirent_safe(rdev->sysfs_state);
4457 if (mddev->bio_set == NULL)
4458 mddev->bio_set = bioset_create(BIO_POOL_SIZE, sizeof(mddev));
4460 spin_lock(&pers_lock);
4461 pers = find_pers(mddev->level, mddev->clevel);
4462 if (!pers || !try_module_get(pers->owner)) {
4463 spin_unlock(&pers_lock);
4464 if (mddev->level != LEVEL_NONE)
4465 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
4468 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
4473 spin_unlock(&pers_lock);
4474 if (mddev->level != pers->level) {
4475 mddev->level = pers->level;
4476 mddev->new_level = pers->level;
4478 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
4480 if (mddev->reshape_position != MaxSector &&
4481 pers->start_reshape == NULL) {
4482 /* This personality cannot handle reshaping... */
4484 module_put(pers->owner);
4488 if (pers->sync_request) {
4489 /* Warn if this is a potentially silly
4492 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
4496 list_for_each_entry(rdev, &mddev->disks, same_set)
4497 list_for_each_entry(rdev2, &mddev->disks, same_set) {
4499 rdev->bdev->bd_contains ==
4500 rdev2->bdev->bd_contains) {
4502 "%s: WARNING: %s appears to be"
4503 " on the same physical disk as"
4506 bdevname(rdev->bdev,b),
4507 bdevname(rdev2->bdev,b2));
4514 "True protection against single-disk"
4515 " failure might be compromised.\n");
4518 mddev->recovery = 0;
4519 /* may be over-ridden by personality */
4520 mddev->resync_max_sectors = mddev->dev_sectors;
4522 mddev->ok_start_degraded = start_dirty_degraded;
4524 if (start_readonly && mddev->ro == 0)
4525 mddev->ro = 2; /* read-only, but switch on first write */
4527 err = mddev->pers->run(mddev);
4529 printk(KERN_ERR "md: pers->run() failed ...\n");
4530 else if (mddev->pers->size(mddev, 0, 0) < mddev->array_sectors) {
4531 WARN_ONCE(!mddev->external_size, "%s: default size too small,"
4532 " but 'external_size' not in effect?\n", __func__);
4534 "md: invalid array_size %llu > default size %llu\n",
4535 (unsigned long long)mddev->array_sectors / 2,
4536 (unsigned long long)mddev->pers->size(mddev, 0, 0) / 2);
4538 mddev->pers->stop(mddev);
4540 if (err == 0 && mddev->pers->sync_request) {
4541 err = bitmap_create(mddev);
4543 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
4544 mdname(mddev), err);
4545 mddev->pers->stop(mddev);
4549 module_put(mddev->pers->owner);
4551 bitmap_destroy(mddev);
4554 if (mddev->pers->sync_request) {
4555 if (mddev->kobj.sd &&
4556 sysfs_create_group(&mddev->kobj, &md_redundancy_group))
4558 "md: cannot register extra attributes for %s\n",
4560 mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action");
4561 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
4564 atomic_set(&mddev->writes_pending,0);
4565 atomic_set(&mddev->max_corr_read_errors,
4566 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS);
4567 mddev->safemode = 0;
4568 mddev->safemode_timer.function = md_safemode_timeout;
4569 mddev->safemode_timer.data = (unsigned long) mddev;
4570 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
4574 list_for_each_entry(rdev, &mddev->disks, same_set)
4575 if (rdev->raid_disk >= 0) {
4577 sprintf(nm, "rd%d", rdev->raid_disk);
4578 if (sysfs_create_link(&mddev->kobj, &rdev->kobj, nm))
4579 /* failure here is OK */;
4582 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4585 md_update_sb(mddev, 0);
4587 md_wakeup_thread(mddev->thread);
4588 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
4590 md_new_event(mddev);
4591 sysfs_notify_dirent_safe(mddev->sysfs_state);
4592 sysfs_notify_dirent_safe(mddev->sysfs_action);
4593 sysfs_notify(&mddev->kobj, NULL, "degraded");
4596 EXPORT_SYMBOL_GPL(md_run);
4598 static int do_md_run(mddev_t *mddev)
4602 err = md_run(mddev);
4605 err = bitmap_load(mddev);
4607 bitmap_destroy(mddev);
4610 set_capacity(mddev->gendisk, mddev->array_sectors);
4611 revalidate_disk(mddev->gendisk);
4612 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
4617 static int restart_array(mddev_t *mddev)
4619 struct gendisk *disk = mddev->gendisk;
4621 /* Complain if it has no devices */
4622 if (list_empty(&mddev->disks))
4628 mddev->safemode = 0;
4630 set_disk_ro(disk, 0);
4631 printk(KERN_INFO "md: %s switched to read-write mode.\n",
4633 /* Kick recovery or resync if necessary */
4634 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4635 md_wakeup_thread(mddev->thread);
4636 md_wakeup_thread(mddev->sync_thread);
4637 sysfs_notify_dirent_safe(mddev->sysfs_state);
4641 /* similar to deny_write_access, but accounts for our holding a reference
4642 * to the file ourselves */
4643 static int deny_bitmap_write_access(struct file * file)
4645 struct inode *inode = file->f_mapping->host;
4647 spin_lock(&inode->i_lock);
4648 if (atomic_read(&inode->i_writecount) > 1) {
4649 spin_unlock(&inode->i_lock);
4652 atomic_set(&inode->i_writecount, -1);
4653 spin_unlock(&inode->i_lock);
4658 void restore_bitmap_write_access(struct file *file)
4660 struct inode *inode = file->f_mapping->host;
4662 spin_lock(&inode->i_lock);
4663 atomic_set(&inode->i_writecount, 1);
4664 spin_unlock(&inode->i_lock);
4667 static void md_clean(mddev_t *mddev)
4669 mddev->array_sectors = 0;
4670 mddev->external_size = 0;
4671 mddev->dev_sectors = 0;
4672 mddev->raid_disks = 0;
4673 mddev->recovery_cp = 0;
4674 mddev->resync_min = 0;
4675 mddev->resync_max = MaxSector;
4676 mddev->reshape_position = MaxSector;
4677 mddev->external = 0;
4678 mddev->persistent = 0;
4679 mddev->level = LEVEL_NONE;
4680 mddev->clevel[0] = 0;
4683 mddev->metadata_type[0] = 0;
4684 mddev->chunk_sectors = 0;
4685 mddev->ctime = mddev->utime = 0;
4687 mddev->max_disks = 0;
4689 mddev->can_decrease_events = 0;
4690 mddev->delta_disks = 0;
4691 mddev->new_level = LEVEL_NONE;
4692 mddev->new_layout = 0;
4693 mddev->new_chunk_sectors = 0;
4694 mddev->curr_resync = 0;
4695 mddev->resync_mismatches = 0;
4696 mddev->suspend_lo = mddev->suspend_hi = 0;
4697 mddev->sync_speed_min = mddev->sync_speed_max = 0;
4698 mddev->recovery = 0;
4700 mddev->degraded = 0;
4701 mddev->safemode = 0;
4702 mddev->bitmap_info.offset = 0;
4703 mddev->bitmap_info.default_offset = 0;
4704 mddev->bitmap_info.chunksize = 0;
4705 mddev->bitmap_info.daemon_sleep = 0;
4706 mddev->bitmap_info.max_write_behind = 0;
4710 static void __md_stop_writes(mddev_t *mddev)
4712 if (mddev->sync_thread) {
4713 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4714 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4715 reap_sync_thread(mddev);
4718 del_timer_sync(&mddev->safemode_timer);
4720 bitmap_flush(mddev);
4721 md_super_wait(mddev);
4723 if (!mddev->in_sync || mddev->flags) {
4724 /* mark array as shutdown cleanly */
4726 md_update_sb(mddev, 1);
4730 void md_stop_writes(mddev_t *mddev)
4733 __md_stop_writes(mddev);
4734 mddev_unlock(mddev);
4736 EXPORT_SYMBOL_GPL(md_stop_writes);
4738 void md_stop(mddev_t *mddev)
4741 mddev->pers->stop(mddev);
4742 if (mddev->pers->sync_request && mddev->to_remove == NULL)
4743 mddev->to_remove = &md_redundancy_group;
4744 module_put(mddev->pers->owner);
4746 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4748 EXPORT_SYMBOL_GPL(md_stop);
4750 static int md_set_readonly(mddev_t *mddev, int is_open)
4753 mutex_lock(&mddev->open_mutex);
4754 if (atomic_read(&mddev->openers) > is_open) {
4755 printk("md: %s still in use.\n",mdname(mddev));
4760 __md_stop_writes(mddev);
4766 set_disk_ro(mddev->gendisk, 1);
4767 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4768 sysfs_notify_dirent_safe(mddev->sysfs_state);
4772 mutex_unlock(&mddev->open_mutex);
4777 * 0 - completely stop and dis-assemble array
4778 * 2 - stop but do not disassemble array
4780 static int do_md_stop(mddev_t * mddev, int mode, int is_open)
4782 struct gendisk *disk = mddev->gendisk;
4785 mutex_lock(&mddev->open_mutex);
4786 if (atomic_read(&mddev->openers) > is_open ||
4787 mddev->sysfs_active) {
4788 printk("md: %s still in use.\n",mdname(mddev));
4789 mutex_unlock(&mddev->open_mutex);
4795 set_disk_ro(disk, 0);
4797 __md_stop_writes(mddev);
4799 mddev->queue->merge_bvec_fn = NULL;
4800 mddev->queue->unplug_fn = NULL;
4801 mddev->queue->backing_dev_info.congested_fn = NULL;
4803 /* tell userspace to handle 'inactive' */
4804 sysfs_notify_dirent_safe(mddev->sysfs_state);
4806 list_for_each_entry(rdev, &mddev->disks, same_set)
4807 if (rdev->raid_disk >= 0) {
4809 sprintf(nm, "rd%d", rdev->raid_disk);
4810 sysfs_remove_link(&mddev->kobj, nm);
4813 set_capacity(disk, 0);
4814 mutex_unlock(&mddev->open_mutex);
4815 revalidate_disk(disk);
4820 mutex_unlock(&mddev->open_mutex);
4822 * Free resources if final stop
4825 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
4827 bitmap_destroy(mddev);
4828 if (mddev->bitmap_info.file) {
4829 restore_bitmap_write_access(mddev->bitmap_info.file);
4830 fput(mddev->bitmap_info.file);
4831 mddev->bitmap_info.file = NULL;
4833 mddev->bitmap_info.offset = 0;
4835 export_array(mddev);
4838 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
4839 if (mddev->hold_active == UNTIL_STOP)
4840 mddev->hold_active = 0;
4842 blk_integrity_unregister(disk);
4843 md_new_event(mddev);
4844 sysfs_notify_dirent_safe(mddev->sysfs_state);
4849 static void autorun_array(mddev_t *mddev)
4854 if (list_empty(&mddev->disks))
4857 printk(KERN_INFO "md: running: ");
4859 list_for_each_entry(rdev, &mddev->disks, same_set) {
4860 char b[BDEVNAME_SIZE];
4861 printk("<%s>", bdevname(rdev->bdev,b));
4865 err = do_md_run(mddev);
4867 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
4868 do_md_stop(mddev, 0, 0);
4873 * lets try to run arrays based on all disks that have arrived
4874 * until now. (those are in pending_raid_disks)
4876 * the method: pick the first pending disk, collect all disks with
4877 * the same UUID, remove all from the pending list and put them into
4878 * the 'same_array' list. Then order this list based on superblock
4879 * update time (freshest comes first), kick out 'old' disks and
4880 * compare superblocks. If everything's fine then run it.
4882 * If "unit" is allocated, then bump its reference count
4884 static void autorun_devices(int part)
4886 mdk_rdev_t *rdev0, *rdev, *tmp;
4888 char b[BDEVNAME_SIZE];
4890 printk(KERN_INFO "md: autorun ...\n");
4891 while (!list_empty(&pending_raid_disks)) {
4894 LIST_HEAD(candidates);
4895 rdev0 = list_entry(pending_raid_disks.next,
4896 mdk_rdev_t, same_set);
4898 printk(KERN_INFO "md: considering %s ...\n",
4899 bdevname(rdev0->bdev,b));
4900 INIT_LIST_HEAD(&candidates);
4901 rdev_for_each_list(rdev, tmp, &pending_raid_disks)
4902 if (super_90_load(rdev, rdev0, 0) >= 0) {
4903 printk(KERN_INFO "md: adding %s ...\n",
4904 bdevname(rdev->bdev,b));
4905 list_move(&rdev->same_set, &candidates);
4908 * now we have a set of devices, with all of them having
4909 * mostly sane superblocks. It's time to allocate the
4913 dev = MKDEV(mdp_major,
4914 rdev0->preferred_minor << MdpMinorShift);
4915 unit = MINOR(dev) >> MdpMinorShift;
4917 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
4920 if (rdev0->preferred_minor != unit) {
4921 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
4922 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
4926 md_probe(dev, NULL, NULL);
4927 mddev = mddev_find(dev);
4928 if (!mddev || !mddev->gendisk) {
4932 "md: cannot allocate memory for md drive.\n");
4935 if (mddev_lock(mddev))
4936 printk(KERN_WARNING "md: %s locked, cannot run\n",
4938 else if (mddev->raid_disks || mddev->major_version
4939 || !list_empty(&mddev->disks)) {
4941 "md: %s already running, cannot run %s\n",
4942 mdname(mddev), bdevname(rdev0->bdev,b));
4943 mddev_unlock(mddev);
4945 printk(KERN_INFO "md: created %s\n", mdname(mddev));
4946 mddev->persistent = 1;
4947 rdev_for_each_list(rdev, tmp, &candidates) {
4948 list_del_init(&rdev->same_set);
4949 if (bind_rdev_to_array(rdev, mddev))
4952 autorun_array(mddev);
4953 mddev_unlock(mddev);
4955 /* on success, candidates will be empty, on error
4958 rdev_for_each_list(rdev, tmp, &candidates) {
4959 list_del_init(&rdev->same_set);
4964 printk(KERN_INFO "md: ... autorun DONE.\n");
4966 #endif /* !MODULE */
4968 static int get_version(void __user * arg)
4972 ver.major = MD_MAJOR_VERSION;
4973 ver.minor = MD_MINOR_VERSION;
4974 ver.patchlevel = MD_PATCHLEVEL_VERSION;
4976 if (copy_to_user(arg, &ver, sizeof(ver)))
4982 static int get_array_info(mddev_t * mddev, void __user * arg)
4984 mdu_array_info_t info;
4985 int nr,working,insync,failed,spare;
4988 nr=working=insync=failed=spare=0;
4989 list_for_each_entry(rdev, &mddev->disks, same_set) {
4991 if (test_bit(Faulty, &rdev->flags))
4995 if (test_bit(In_sync, &rdev->flags))
5002 info.major_version = mddev->major_version;
5003 info.minor_version = mddev->minor_version;
5004 info.patch_version = MD_PATCHLEVEL_VERSION;
5005 info.ctime = mddev->ctime;
5006 info.level = mddev->level;
5007 info.size = mddev->dev_sectors / 2;
5008 if (info.size != mddev->dev_sectors / 2) /* overflow */
5011 info.raid_disks = mddev->raid_disks;
5012 info.md_minor = mddev->md_minor;
5013 info.not_persistent= !mddev->persistent;
5015 info.utime = mddev->utime;
5018 info.state = (1<<MD_SB_CLEAN);
5019 if (mddev->bitmap && mddev->bitmap_info.offset)
5020 info.state = (1<<MD_SB_BITMAP_PRESENT);
5021 info.active_disks = insync;
5022 info.working_disks = working;
5023 info.failed_disks = failed;
5024 info.spare_disks = spare;
5026 info.layout = mddev->layout;
5027 info.chunk_size = mddev->chunk_sectors << 9;
5029 if (copy_to_user(arg, &info, sizeof(info)))
5035 static int get_bitmap_file(mddev_t * mddev, void __user * arg)
5037 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
5038 char *ptr, *buf = NULL;
5041 if (md_allow_write(mddev))
5042 file = kmalloc(sizeof(*file), GFP_NOIO);
5044 file = kmalloc(sizeof(*file), GFP_KERNEL);
5049 /* bitmap disabled, zero the first byte and copy out */
5050 if (!mddev->bitmap || !mddev->bitmap->file) {
5051 file->pathname[0] = '\0';
5055 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
5059 ptr = d_path(&mddev->bitmap->file->f_path, buf, sizeof(file->pathname));
5063 strcpy(file->pathname, ptr);
5067 if (copy_to_user(arg, file, sizeof(*file)))
5075 static int get_disk_info(mddev_t * mddev, void __user * arg)
5077 mdu_disk_info_t info;
5080 if (copy_from_user(&info, arg, sizeof(info)))
5083 rdev = find_rdev_nr(mddev, info.number);
5085 info.major = MAJOR(rdev->bdev->bd_dev);
5086 info.minor = MINOR(rdev->bdev->bd_dev);
5087 info.raid_disk = rdev->raid_disk;
5089 if (test_bit(Faulty, &rdev->flags))
5090 info.state |= (1<<MD_DISK_FAULTY);
5091 else if (test_bit(In_sync, &rdev->flags)) {
5092 info.state |= (1<<MD_DISK_ACTIVE);
5093 info.state |= (1<<MD_DISK_SYNC);
5095 if (test_bit(WriteMostly, &rdev->flags))
5096 info.state |= (1<<MD_DISK_WRITEMOSTLY);
5098 info.major = info.minor = 0;
5099 info.raid_disk = -1;
5100 info.state = (1<<MD_DISK_REMOVED);
5103 if (copy_to_user(arg, &info, sizeof(info)))
5109 static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
5111 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
5113 dev_t dev = MKDEV(info->major,info->minor);
5115 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
5118 if (!mddev->raid_disks) {
5120 /* expecting a device which has a superblock */
5121 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
5124 "md: md_import_device returned %ld\n",
5126 return PTR_ERR(rdev);
5128 if (!list_empty(&mddev->disks)) {
5129 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
5130 mdk_rdev_t, same_set);
5131 err = super_types[mddev->major_version]
5132 .load_super(rdev, rdev0, mddev->minor_version);
5135 "md: %s has different UUID to %s\n",
5136 bdevname(rdev->bdev,b),
5137 bdevname(rdev0->bdev,b2));
5142 err = bind_rdev_to_array(rdev, mddev);
5149 * add_new_disk can be used once the array is assembled
5150 * to add "hot spares". They must already have a superblock
5155 if (!mddev->pers->hot_add_disk) {
5157 "%s: personality does not support diskops!\n",
5161 if (mddev->persistent)
5162 rdev = md_import_device(dev, mddev->major_version,
5163 mddev->minor_version);
5165 rdev = md_import_device(dev, -1, -1);
5168 "md: md_import_device returned %ld\n",
5170 return PTR_ERR(rdev);
5172 /* set saved_raid_disk if appropriate */
5173 if (!mddev->persistent) {
5174 if (info->state & (1<<MD_DISK_SYNC) &&
5175 info->raid_disk < mddev->raid_disks) {
5176 rdev->raid_disk = info->raid_disk;
5177 set_bit(In_sync, &rdev->flags);
5179 rdev->raid_disk = -1;
5181 super_types[mddev->major_version].
5182 validate_super(mddev, rdev);
5183 if (test_bit(In_sync, &rdev->flags))
5184 rdev->saved_raid_disk = rdev->raid_disk;
5186 rdev->saved_raid_disk = -1;
5188 clear_bit(In_sync, &rdev->flags); /* just to be sure */
5189 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
5190 set_bit(WriteMostly, &rdev->flags);
5192 clear_bit(WriteMostly, &rdev->flags);
5194 rdev->raid_disk = -1;
5195 err = bind_rdev_to_array(rdev, mddev);
5196 if (!err && !mddev->pers->hot_remove_disk) {
5197 /* If there is hot_add_disk but no hot_remove_disk
5198 * then added disks for geometry changes,
5199 * and should be added immediately.
5201 super_types[mddev->major_version].
5202 validate_super(mddev, rdev);
5203 err = mddev->pers->hot_add_disk(mddev, rdev);
5205 unbind_rdev_from_array(rdev);
5210 sysfs_notify_dirent_safe(rdev->sysfs_state);
5212 md_update_sb(mddev, 1);
5213 if (mddev->degraded)
5214 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
5215 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5216 md_wakeup_thread(mddev->thread);
5220 /* otherwise, add_new_disk is only allowed
5221 * for major_version==0 superblocks
5223 if (mddev->major_version != 0) {
5224 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
5229 if (!(info->state & (1<<MD_DISK_FAULTY))) {
5231 rdev = md_import_device(dev, -1, 0);
5234 "md: error, md_import_device() returned %ld\n",
5236 return PTR_ERR(rdev);
5238 rdev->desc_nr = info->number;
5239 if (info->raid_disk < mddev->raid_disks)
5240 rdev->raid_disk = info->raid_disk;
5242 rdev->raid_disk = -1;
5244 if (rdev->raid_disk < mddev->raid_disks)
5245 if (info->state & (1<<MD_DISK_SYNC))
5246 set_bit(In_sync, &rdev->flags);
5248 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
5249 set_bit(WriteMostly, &rdev->flags);
5251 if (!mddev->persistent) {
5252 printk(KERN_INFO "md: nonpersistent superblock ...\n");
5253 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
5255 rdev->sb_start = calc_dev_sboffset(rdev);
5256 rdev->sectors = rdev->sb_start;
5258 err = bind_rdev_to_array(rdev, mddev);
5268 static int hot_remove_disk(mddev_t * mddev, dev_t dev)
5270 char b[BDEVNAME_SIZE];
5273 rdev = find_rdev(mddev, dev);
5277 if (rdev->raid_disk >= 0)
5280 kick_rdev_from_array(rdev);
5281 md_update_sb(mddev, 1);
5282 md_new_event(mddev);
5286 printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n",
5287 bdevname(rdev->bdev,b), mdname(mddev));
5291 static int hot_add_disk(mddev_t * mddev, dev_t dev)
5293 char b[BDEVNAME_SIZE];
5300 if (mddev->major_version != 0) {
5301 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
5302 " version-0 superblocks.\n",
5306 if (!mddev->pers->hot_add_disk) {
5308 "%s: personality does not support diskops!\n",
5313 rdev = md_import_device(dev, -1, 0);
5316 "md: error, md_import_device() returned %ld\n",
5321 if (mddev->persistent)
5322 rdev->sb_start = calc_dev_sboffset(rdev);
5324 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
5326 rdev->sectors = rdev->sb_start;
5328 if (test_bit(Faulty, &rdev->flags)) {
5330 "md: can not hot-add faulty %s disk to %s!\n",
5331 bdevname(rdev->bdev,b), mdname(mddev));
5335 clear_bit(In_sync, &rdev->flags);
5337 rdev->saved_raid_disk = -1;
5338 err = bind_rdev_to_array(rdev, mddev);
5343 * The rest should better be atomic, we can have disk failures
5344 * noticed in interrupt contexts ...
5347 rdev->raid_disk = -1;
5349 md_update_sb(mddev, 1);
5352 * Kick recovery, maybe this spare has to be added to the
5353 * array immediately.
5355 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5356 md_wakeup_thread(mddev->thread);
5357 md_new_event(mddev);
5365 static int set_bitmap_file(mddev_t *mddev, int fd)
5370 if (!mddev->pers->quiesce)
5372 if (mddev->recovery || mddev->sync_thread)
5374 /* we should be able to change the bitmap.. */
5380 return -EEXIST; /* cannot add when bitmap is present */
5381 mddev->bitmap_info.file = fget(fd);
5383 if (mddev->bitmap_info.file == NULL) {
5384 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
5389 err = deny_bitmap_write_access(mddev->bitmap_info.file);
5391 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
5393 fput(mddev->bitmap_info.file);
5394 mddev->bitmap_info.file = NULL;
5397 mddev->bitmap_info.offset = 0; /* file overrides offset */
5398 } else if (mddev->bitmap == NULL)
5399 return -ENOENT; /* cannot remove what isn't there */
5402 mddev->pers->quiesce(mddev, 1);
5404 err = bitmap_create(mddev);
5406 err = bitmap_load(mddev);
5408 if (fd < 0 || err) {
5409 bitmap_destroy(mddev);
5410 fd = -1; /* make sure to put the file */
5412 mddev->pers->quiesce(mddev, 0);
5415 if (mddev->bitmap_info.file) {
5416 restore_bitmap_write_access(mddev->bitmap_info.file);
5417 fput(mddev->bitmap_info.file);
5419 mddev->bitmap_info.file = NULL;
5426 * set_array_info is used two different ways
5427 * The original usage is when creating a new array.
5428 * In this usage, raid_disks is > 0 and it together with
5429 * level, size, not_persistent,layout,chunksize determine the
5430 * shape of the array.
5431 * This will always create an array with a type-0.90.0 superblock.
5432 * The newer usage is when assembling an array.
5433 * In this case raid_disks will be 0, and the major_version field is
5434 * use to determine which style super-blocks are to be found on the devices.
5435 * The minor and patch _version numbers are also kept incase the
5436 * super_block handler wishes to interpret them.
5438 static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
5441 if (info->raid_disks == 0) {
5442 /* just setting version number for superblock loading */
5443 if (info->major_version < 0 ||
5444 info->major_version >= ARRAY_SIZE(super_types) ||
5445 super_types[info->major_version].name == NULL) {
5446 /* maybe try to auto-load a module? */
5448 "md: superblock version %d not known\n",
5449 info->major_version);
5452 mddev->major_version = info->major_version;
5453 mddev->minor_version = info->minor_version;
5454 mddev->patch_version = info->patch_version;
5455 mddev->persistent = !info->not_persistent;
5456 /* ensure mddev_put doesn't delete this now that there
5457 * is some minimal configuration.
5459 mddev->ctime = get_seconds();
5462 mddev->major_version = MD_MAJOR_VERSION;
5463 mddev->minor_version = MD_MINOR_VERSION;
5464 mddev->patch_version = MD_PATCHLEVEL_VERSION;
5465 mddev->ctime = get_seconds();
5467 mddev->level = info->level;
5468 mddev->clevel[0] = 0;
5469 mddev->dev_sectors = 2 * (sector_t)info->size;
5470 mddev->raid_disks = info->raid_disks;
5471 /* don't set md_minor, it is determined by which /dev/md* was
5474 if (info->state & (1<<MD_SB_CLEAN))
5475 mddev->recovery_cp = MaxSector;
5477 mddev->recovery_cp = 0;
5478 mddev->persistent = ! info->not_persistent;
5479 mddev->external = 0;
5481 mddev->layout = info->layout;
5482 mddev->chunk_sectors = info->chunk_size >> 9;
5484 mddev->max_disks = MD_SB_DISKS;
5486 if (mddev->persistent)
5488 set_bit(MD_CHANGE_DEVS, &mddev->flags);
5490 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
5491 mddev->bitmap_info.offset = 0;
5493 mddev->reshape_position = MaxSector;
5496 * Generate a 128 bit UUID
5498 get_random_bytes(mddev->uuid, 16);
5500 mddev->new_level = mddev->level;
5501 mddev->new_chunk_sectors = mddev->chunk_sectors;
5502 mddev->new_layout = mddev->layout;
5503 mddev->delta_disks = 0;
5508 void md_set_array_sectors(mddev_t *mddev, sector_t array_sectors)
5510 WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__);
5512 if (mddev->external_size)
5515 mddev->array_sectors = array_sectors;
5517 EXPORT_SYMBOL(md_set_array_sectors);
5519 static int update_size(mddev_t *mddev, sector_t num_sectors)
5523 int fit = (num_sectors == 0);
5525 if (mddev->pers->resize == NULL)
5527 /* The "num_sectors" is the number of sectors of each device that
5528 * is used. This can only make sense for arrays with redundancy.
5529 * linear and raid0 always use whatever space is available. We can only
5530 * consider changing this number if no resync or reconstruction is
5531 * happening, and if the new size is acceptable. It must fit before the
5532 * sb_start or, if that is <data_offset, it must fit before the size
5533 * of each device. If num_sectors is zero, we find the largest size
5537 if (mddev->sync_thread)
5540 /* Sorry, cannot grow a bitmap yet, just remove it,
5544 list_for_each_entry(rdev, &mddev->disks, same_set) {
5545 sector_t avail = rdev->sectors;
5547 if (fit && (num_sectors == 0 || num_sectors > avail))
5548 num_sectors = avail;
5549 if (avail < num_sectors)
5552 rv = mddev->pers->resize(mddev, num_sectors);
5554 revalidate_disk(mddev->gendisk);
5558 static int update_raid_disks(mddev_t *mddev, int raid_disks)
5561 /* change the number of raid disks */
5562 if (mddev->pers->check_reshape == NULL)
5564 if (raid_disks <= 0 ||
5565 (mddev->max_disks && raid_disks >= mddev->max_disks))
5567 if (mddev->sync_thread || mddev->reshape_position != MaxSector)
5569 mddev->delta_disks = raid_disks - mddev->raid_disks;
5571 rv = mddev->pers->check_reshape(mddev);
5577 * update_array_info is used to change the configuration of an
5579 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
5580 * fields in the info are checked against the array.
5581 * Any differences that cannot be handled will cause an error.
5582 * Normally, only one change can be managed at a time.
5584 static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
5590 /* calculate expected state,ignoring low bits */
5591 if (mddev->bitmap && mddev->bitmap_info.offset)
5592 state |= (1 << MD_SB_BITMAP_PRESENT);
5594 if (mddev->major_version != info->major_version ||
5595 mddev->minor_version != info->minor_version ||
5596 /* mddev->patch_version != info->patch_version || */
5597 mddev->ctime != info->ctime ||
5598 mddev->level != info->level ||
5599 /* mddev->layout != info->layout || */
5600 !mddev->persistent != info->not_persistent||
5601 mddev->chunk_sectors != info->chunk_size >> 9 ||
5602 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
5603 ((state^info->state) & 0xfffffe00)
5606 /* Check there is only one change */
5607 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
5609 if (mddev->raid_disks != info->raid_disks)
5611 if (mddev->layout != info->layout)
5613 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT))
5620 if (mddev->layout != info->layout) {
5622 * we don't need to do anything at the md level, the
5623 * personality will take care of it all.
5625 if (mddev->pers->check_reshape == NULL)
5628 mddev->new_layout = info->layout;
5629 rv = mddev->pers->check_reshape(mddev);
5631 mddev->new_layout = mddev->layout;
5635 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
5636 rv = update_size(mddev, (sector_t)info->size * 2);
5638 if (mddev->raid_disks != info->raid_disks)
5639 rv = update_raid_disks(mddev, info->raid_disks);
5641 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
5642 if (mddev->pers->quiesce == NULL)
5644 if (mddev->recovery || mddev->sync_thread)
5646 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
5647 /* add the bitmap */
5650 if (mddev->bitmap_info.default_offset == 0)
5652 mddev->bitmap_info.offset =
5653 mddev->bitmap_info.default_offset;
5654 mddev->pers->quiesce(mddev, 1);
5655 rv = bitmap_create(mddev);
5657 rv = bitmap_load(mddev);
5659 bitmap_destroy(mddev);
5660 mddev->pers->quiesce(mddev, 0);
5662 /* remove the bitmap */
5665 if (mddev->bitmap->file)
5667 mddev->pers->quiesce(mddev, 1);
5668 bitmap_destroy(mddev);
5669 mddev->pers->quiesce(mddev, 0);
5670 mddev->bitmap_info.offset = 0;
5673 md_update_sb(mddev, 1);
5677 static int set_disk_faulty(mddev_t *mddev, dev_t dev)
5681 if (mddev->pers == NULL)
5684 rdev = find_rdev(mddev, dev);
5688 md_error(mddev, rdev);
5693 * We have a problem here : there is no easy way to give a CHS
5694 * virtual geometry. We currently pretend that we have a 2 heads
5695 * 4 sectors (with a BIG number of cylinders...). This drives
5696 * dosfs just mad... ;-)
5698 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
5700 mddev_t *mddev = bdev->bd_disk->private_data;
5704 geo->cylinders = mddev->array_sectors / 8;
5708 static int md_ioctl(struct block_device *bdev, fmode_t mode,
5709 unsigned int cmd, unsigned long arg)
5712 void __user *argp = (void __user *)arg;
5713 mddev_t *mddev = NULL;
5716 if (!capable(CAP_SYS_ADMIN))
5720 * Commands dealing with the RAID driver but not any
5726 err = get_version(argp);
5729 case PRINT_RAID_DEBUG:
5737 autostart_arrays(arg);
5744 * Commands creating/starting a new array:
5747 mddev = bdev->bd_disk->private_data;
5754 err = mddev_lock(mddev);
5757 "md: ioctl lock interrupted, reason %d, cmd %d\n",
5764 case SET_ARRAY_INFO:
5766 mdu_array_info_t info;
5768 memset(&info, 0, sizeof(info));
5769 else if (copy_from_user(&info, argp, sizeof(info))) {
5774 err = update_array_info(mddev, &info);
5776 printk(KERN_WARNING "md: couldn't update"
5777 " array info. %d\n", err);
5782 if (!list_empty(&mddev->disks)) {
5784 "md: array %s already has disks!\n",
5789 if (mddev->raid_disks) {
5791 "md: array %s already initialised!\n",
5796 err = set_array_info(mddev, &info);
5798 printk(KERN_WARNING "md: couldn't set"
5799 " array info. %d\n", err);
5809 * Commands querying/configuring an existing array:
5811 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
5812 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
5813 if ((!mddev->raid_disks && !mddev->external)
5814 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
5815 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
5816 && cmd != GET_BITMAP_FILE) {
5822 * Commands even a read-only array can execute:
5826 case GET_ARRAY_INFO:
5827 err = get_array_info(mddev, argp);
5830 case GET_BITMAP_FILE:
5831 err = get_bitmap_file(mddev, argp);
5835 err = get_disk_info(mddev, argp);
5838 case RESTART_ARRAY_RW:
5839 err = restart_array(mddev);
5843 err = do_md_stop(mddev, 0, 1);
5847 err = md_set_readonly(mddev, 1);
5851 if (get_user(ro, (int __user *)(arg))) {
5857 /* if the bdev is going readonly the value of mddev->ro
5858 * does not matter, no writes are coming
5863 /* are we are already prepared for writes? */
5867 /* transitioning to readauto need only happen for
5868 * arrays that call md_write_start
5871 err = restart_array(mddev);
5874 set_disk_ro(mddev->gendisk, 0);
5881 * The remaining ioctls are changing the state of the
5882 * superblock, so we do not allow them on read-only arrays.
5883 * However non-MD ioctls (e.g. get-size) will still come through
5884 * here and hit the 'default' below, so only disallow
5885 * 'md' ioctls, and switch to rw mode if started auto-readonly.
5887 if (_IOC_TYPE(cmd) == MD_MAJOR && mddev->ro && mddev->pers) {
5888 if (mddev->ro == 2) {
5890 sysfs_notify_dirent_safe(mddev->sysfs_state);
5891 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5892 md_wakeup_thread(mddev->thread);
5903 mdu_disk_info_t info;
5904 if (copy_from_user(&info, argp, sizeof(info)))
5907 err = add_new_disk(mddev, &info);
5911 case HOT_REMOVE_DISK:
5912 err = hot_remove_disk(mddev, new_decode_dev(arg));
5916 err = hot_add_disk(mddev, new_decode_dev(arg));
5919 case SET_DISK_FAULTY:
5920 err = set_disk_faulty(mddev, new_decode_dev(arg));
5924 err = do_md_run(mddev);
5927 case SET_BITMAP_FILE:
5928 err = set_bitmap_file(mddev, (int)arg);
5938 if (mddev->hold_active == UNTIL_IOCTL &&
5940 mddev->hold_active = 0;
5941 mddev_unlock(mddev);
5950 #ifdef CONFIG_COMPAT
5951 static int md_compat_ioctl(struct block_device *bdev, fmode_t mode,
5952 unsigned int cmd, unsigned long arg)
5955 case HOT_REMOVE_DISK:
5957 case SET_DISK_FAULTY:
5958 case SET_BITMAP_FILE:
5959 /* These take in integer arg, do not convert */
5962 arg = (unsigned long)compat_ptr(arg);
5966 return md_ioctl(bdev, mode, cmd, arg);
5968 #endif /* CONFIG_COMPAT */
5970 static int md_open(struct block_device *bdev, fmode_t mode)
5973 * Succeed if we can lock the mddev, which confirms that
5974 * it isn't being stopped right now.
5976 mddev_t *mddev = mddev_find(bdev->bd_dev);
5979 if (mddev->gendisk != bdev->bd_disk) {
5980 /* we are racing with mddev_put which is discarding this
5984 /* Wait until bdev->bd_disk is definitely gone */
5985 flush_workqueue(md_misc_wq);
5986 /* Then retry the open from the top */
5987 return -ERESTARTSYS;
5989 BUG_ON(mddev != bdev->bd_disk->private_data);
5991 if ((err = mutex_lock_interruptible(&mddev->open_mutex)))
5995 atomic_inc(&mddev->openers);
5996 mutex_unlock(&mddev->open_mutex);
5998 check_disk_size_change(mddev->gendisk, bdev);
6003 static int md_release(struct gendisk *disk, fmode_t mode)
6005 mddev_t *mddev = disk->private_data;
6008 atomic_dec(&mddev->openers);
6013 static const struct block_device_operations md_fops =
6015 .owner = THIS_MODULE,
6017 .release = md_release,
6019 #ifdef CONFIG_COMPAT
6020 .compat_ioctl = md_compat_ioctl,
6022 .getgeo = md_getgeo,
6025 static int md_thread(void * arg)
6027 mdk_thread_t *thread = arg;
6030 * md_thread is a 'system-thread', it's priority should be very
6031 * high. We avoid resource deadlocks individually in each
6032 * raid personality. (RAID5 does preallocation) We also use RR and
6033 * the very same RT priority as kswapd, thus we will never get
6034 * into a priority inversion deadlock.
6036 * we definitely have to have equal or higher priority than
6037 * bdflush, otherwise bdflush will deadlock if there are too
6038 * many dirty RAID5 blocks.
6041 allow_signal(SIGKILL);
6042 while (!kthread_should_stop()) {
6044 /* We need to wait INTERRUPTIBLE so that
6045 * we don't add to the load-average.
6046 * That means we need to be sure no signals are
6049 if (signal_pending(current))
6050 flush_signals(current);
6052 wait_event_interruptible_timeout
6054 test_bit(THREAD_WAKEUP, &thread->flags)
6055 || kthread_should_stop(),
6058 clear_bit(THREAD_WAKEUP, &thread->flags);
6059 if (!kthread_should_stop())
6060 thread->run(thread->mddev);
6066 void md_wakeup_thread(mdk_thread_t *thread)
6069 dprintk("md: waking up MD thread %s.\n", thread->tsk->comm);
6070 set_bit(THREAD_WAKEUP, &thread->flags);
6071 wake_up(&thread->wqueue);
6075 mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
6078 mdk_thread_t *thread;
6080 thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL);
6084 init_waitqueue_head(&thread->wqueue);
6087 thread->mddev = mddev;
6088 thread->timeout = MAX_SCHEDULE_TIMEOUT;
6089 thread->tsk = kthread_run(md_thread, thread,
6091 mdname(thread->mddev),
6092 name ?: mddev->pers->name);
6093 if (IS_ERR(thread->tsk)) {
6100 void md_unregister_thread(mdk_thread_t *thread)
6104 dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
6106 kthread_stop(thread->tsk);
6110 void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
6117 if (!rdev || test_bit(Faulty, &rdev->flags))
6120 if (mddev->external)
6121 set_bit(Blocked, &rdev->flags);
6123 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
6125 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
6126 __builtin_return_address(0),__builtin_return_address(1),
6127 __builtin_return_address(2),__builtin_return_address(3));
6131 if (!mddev->pers->error_handler)
6133 mddev->pers->error_handler(mddev,rdev);
6134 if (mddev->degraded)
6135 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6136 sysfs_notify_dirent_safe(rdev->sysfs_state);
6137 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6138 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6139 md_wakeup_thread(mddev->thread);
6140 if (mddev->event_work.func)
6141 queue_work(md_misc_wq, &mddev->event_work);
6142 md_new_event_inintr(mddev);
6145 /* seq_file implementation /proc/mdstat */
6147 static void status_unused(struct seq_file *seq)
6152 seq_printf(seq, "unused devices: ");
6154 list_for_each_entry(rdev, &pending_raid_disks, same_set) {
6155 char b[BDEVNAME_SIZE];
6157 seq_printf(seq, "%s ",
6158 bdevname(rdev->bdev,b));
6161 seq_printf(seq, "<none>");
6163 seq_printf(seq, "\n");
6167 static void status_resync(struct seq_file *seq, mddev_t * mddev)
6169 sector_t max_sectors, resync, res;
6170 unsigned long dt, db;
6173 unsigned int per_milli;
6175 resync = mddev->curr_resync - atomic_read(&mddev->recovery_active);
6177 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
6178 max_sectors = mddev->resync_max_sectors;
6180 max_sectors = mddev->dev_sectors;
6183 * Should not happen.
6189 /* Pick 'scale' such that (resync>>scale)*1000 will fit
6190 * in a sector_t, and (max_sectors>>scale) will fit in a
6191 * u32, as those are the requirements for sector_div.
6192 * Thus 'scale' must be at least 10
6195 if (sizeof(sector_t) > sizeof(unsigned long)) {
6196 while ( max_sectors/2 > (1ULL<<(scale+32)))
6199 res = (resync>>scale)*1000;
6200 sector_div(res, (u32)((max_sectors>>scale)+1));
6204 int i, x = per_milli/50, y = 20-x;
6205 seq_printf(seq, "[");
6206 for (i = 0; i < x; i++)
6207 seq_printf(seq, "=");
6208 seq_printf(seq, ">");
6209 for (i = 0; i < y; i++)
6210 seq_printf(seq, ".");
6211 seq_printf(seq, "] ");
6213 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
6214 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
6216 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
6218 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
6219 "resync" : "recovery"))),
6220 per_milli/10, per_milli % 10,
6221 (unsigned long long) resync/2,
6222 (unsigned long long) max_sectors/2);
6225 * dt: time from mark until now
6226 * db: blocks written from mark until now
6227 * rt: remaining time
6229 * rt is a sector_t, so could be 32bit or 64bit.
6230 * So we divide before multiply in case it is 32bit and close
6232 * We scale the divisor (db) by 32 to avoid loosing precision
6233 * near the end of resync when the number of remaining sectors
6235 * We then divide rt by 32 after multiplying by db to compensate.
6236 * The '+1' avoids division by zero if db is very small.
6238 dt = ((jiffies - mddev->resync_mark) / HZ);
6240 db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active))
6241 - mddev->resync_mark_cnt;
6243 rt = max_sectors - resync; /* number of remaining sectors */
6244 sector_div(rt, db/32+1);
6248 seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60,
6249 ((unsigned long)rt % 60)/6);
6251 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
6254 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
6256 struct list_head *tmp;
6266 spin_lock(&all_mddevs_lock);
6267 list_for_each(tmp,&all_mddevs)
6269 mddev = list_entry(tmp, mddev_t, all_mddevs);
6271 spin_unlock(&all_mddevs_lock);
6274 spin_unlock(&all_mddevs_lock);
6276 return (void*)2;/* tail */
6280 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
6282 struct list_head *tmp;
6283 mddev_t *next_mddev, *mddev = v;
6289 spin_lock(&all_mddevs_lock);
6291 tmp = all_mddevs.next;
6293 tmp = mddev->all_mddevs.next;
6294 if (tmp != &all_mddevs)
6295 next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs));
6297 next_mddev = (void*)2;
6300 spin_unlock(&all_mddevs_lock);
6308 static void md_seq_stop(struct seq_file *seq, void *v)
6312 if (mddev && v != (void*)1 && v != (void*)2)
6316 struct mdstat_info {
6320 static int md_seq_show(struct seq_file *seq, void *v)
6325 struct mdstat_info *mi = seq->private;
6326 struct bitmap *bitmap;
6328 if (v == (void*)1) {
6329 struct mdk_personality *pers;
6330 seq_printf(seq, "Personalities : ");
6331 spin_lock(&pers_lock);
6332 list_for_each_entry(pers, &pers_list, list)
6333 seq_printf(seq, "[%s] ", pers->name);
6335 spin_unlock(&pers_lock);
6336 seq_printf(seq, "\n");
6337 mi->event = atomic_read(&md_event_count);
6340 if (v == (void*)2) {
6345 if (mddev_lock(mddev) < 0)
6348 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
6349 seq_printf(seq, "%s : %sactive", mdname(mddev),
6350 mddev->pers ? "" : "in");
6353 seq_printf(seq, " (read-only)");
6355 seq_printf(seq, " (auto-read-only)");
6356 seq_printf(seq, " %s", mddev->pers->name);
6360 list_for_each_entry(rdev, &mddev->disks, same_set) {
6361 char b[BDEVNAME_SIZE];
6362 seq_printf(seq, " %s[%d]",
6363 bdevname(rdev->bdev,b), rdev->desc_nr);
6364 if (test_bit(WriteMostly, &rdev->flags))
6365 seq_printf(seq, "(W)");
6366 if (test_bit(Faulty, &rdev->flags)) {
6367 seq_printf(seq, "(F)");
6369 } else if (rdev->raid_disk < 0)
6370 seq_printf(seq, "(S)"); /* spare */
6371 sectors += rdev->sectors;
6374 if (!list_empty(&mddev->disks)) {
6376 seq_printf(seq, "\n %llu blocks",
6377 (unsigned long long)
6378 mddev->array_sectors / 2);
6380 seq_printf(seq, "\n %llu blocks",
6381 (unsigned long long)sectors / 2);
6383 if (mddev->persistent) {
6384 if (mddev->major_version != 0 ||
6385 mddev->minor_version != 90) {
6386 seq_printf(seq," super %d.%d",
6387 mddev->major_version,
6388 mddev->minor_version);
6390 } else if (mddev->external)
6391 seq_printf(seq, " super external:%s",
6392 mddev->metadata_type);
6394 seq_printf(seq, " super non-persistent");
6397 mddev->pers->status(seq, mddev);
6398 seq_printf(seq, "\n ");
6399 if (mddev->pers->sync_request) {
6400 if (mddev->curr_resync > 2) {
6401 status_resync(seq, mddev);
6402 seq_printf(seq, "\n ");
6403 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
6404 seq_printf(seq, "\tresync=DELAYED\n ");
6405 else if (mddev->recovery_cp < MaxSector)
6406 seq_printf(seq, "\tresync=PENDING\n ");
6409 seq_printf(seq, "\n ");
6411 if ((bitmap = mddev->bitmap)) {
6412 unsigned long chunk_kb;
6413 unsigned long flags;
6414 spin_lock_irqsave(&bitmap->lock, flags);
6415 chunk_kb = mddev->bitmap_info.chunksize >> 10;
6416 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
6418 bitmap->pages - bitmap->missing_pages,
6420 (bitmap->pages - bitmap->missing_pages)
6421 << (PAGE_SHIFT - 10),
6422 chunk_kb ? chunk_kb : mddev->bitmap_info.chunksize,
6423 chunk_kb ? "KB" : "B");
6425 seq_printf(seq, ", file: ");
6426 seq_path(seq, &bitmap->file->f_path, " \t\n");
6429 seq_printf(seq, "\n");
6430 spin_unlock_irqrestore(&bitmap->lock, flags);
6433 seq_printf(seq, "\n");
6435 mddev_unlock(mddev);
6440 static const struct seq_operations md_seq_ops = {
6441 .start = md_seq_start,
6442 .next = md_seq_next,
6443 .stop = md_seq_stop,
6444 .show = md_seq_show,
6447 static int md_seq_open(struct inode *inode, struct file *file)
6450 struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL);
6454 error = seq_open(file, &md_seq_ops);
6458 struct seq_file *p = file->private_data;
6460 mi->event = atomic_read(&md_event_count);
6465 static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
6467 struct seq_file *m = filp->private_data;
6468 struct mdstat_info *mi = m->private;
6471 poll_wait(filp, &md_event_waiters, wait);
6473 /* always allow read */
6474 mask = POLLIN | POLLRDNORM;
6476 if (mi->event != atomic_read(&md_event_count))
6477 mask |= POLLERR | POLLPRI;
6481 static const struct file_operations md_seq_fops = {
6482 .owner = THIS_MODULE,
6483 .open = md_seq_open,
6485 .llseek = seq_lseek,
6486 .release = seq_release_private,
6487 .poll = mdstat_poll,
6490 int register_md_personality(struct mdk_personality *p)
6492 spin_lock(&pers_lock);
6493 list_add_tail(&p->list, &pers_list);
6494 printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level);
6495 spin_unlock(&pers_lock);
6499 int unregister_md_personality(struct mdk_personality *p)
6501 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
6502 spin_lock(&pers_lock);
6503 list_del_init(&p->list);
6504 spin_unlock(&pers_lock);
6508 static int is_mddev_idle(mddev_t *mddev, int init)
6516 rdev_for_each_rcu(rdev, mddev) {
6517 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
6518 curr_events = (int)part_stat_read(&disk->part0, sectors[0]) +
6519 (int)part_stat_read(&disk->part0, sectors[1]) -
6520 atomic_read(&disk->sync_io);
6521 /* sync IO will cause sync_io to increase before the disk_stats
6522 * as sync_io is counted when a request starts, and
6523 * disk_stats is counted when it completes.
6524 * So resync activity will cause curr_events to be smaller than
6525 * when there was no such activity.
6526 * non-sync IO will cause disk_stat to increase without
6527 * increasing sync_io so curr_events will (eventually)
6528 * be larger than it was before. Once it becomes
6529 * substantially larger, the test below will cause
6530 * the array to appear non-idle, and resync will slow
6532 * If there is a lot of outstanding resync activity when
6533 * we set last_event to curr_events, then all that activity
6534 * completing might cause the array to appear non-idle
6535 * and resync will be slowed down even though there might
6536 * not have been non-resync activity. This will only
6537 * happen once though. 'last_events' will soon reflect
6538 * the state where there is little or no outstanding
6539 * resync requests, and further resync activity will
6540 * always make curr_events less than last_events.
6543 if (init || curr_events - rdev->last_events > 64) {
6544 rdev->last_events = curr_events;
6552 void md_done_sync(mddev_t *mddev, int blocks, int ok)
6554 /* another "blocks" (512byte) blocks have been synced */
6555 atomic_sub(blocks, &mddev->recovery_active);
6556 wake_up(&mddev->recovery_wait);
6558 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6559 md_wakeup_thread(mddev->thread);
6560 // stop recovery, signal do_sync ....
6565 /* md_write_start(mddev, bi)
6566 * If we need to update some array metadata (e.g. 'active' flag
6567 * in superblock) before writing, schedule a superblock update
6568 * and wait for it to complete.
6570 void md_write_start(mddev_t *mddev, struct bio *bi)
6573 if (bio_data_dir(bi) != WRITE)
6576 BUG_ON(mddev->ro == 1);
6577 if (mddev->ro == 2) {
6578 /* need to switch to read/write */
6580 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6581 md_wakeup_thread(mddev->thread);
6582 md_wakeup_thread(mddev->sync_thread);
6585 atomic_inc(&mddev->writes_pending);
6586 if (mddev->safemode == 1)
6587 mddev->safemode = 0;
6588 if (mddev->in_sync) {
6589 spin_lock_irq(&mddev->write_lock);
6590 if (mddev->in_sync) {
6592 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6593 set_bit(MD_CHANGE_PENDING, &mddev->flags);
6594 md_wakeup_thread(mddev->thread);
6597 spin_unlock_irq(&mddev->write_lock);
6600 sysfs_notify_dirent_safe(mddev->sysfs_state);
6601 wait_event(mddev->sb_wait,
6602 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
6605 void md_write_end(mddev_t *mddev)
6607 if (atomic_dec_and_test(&mddev->writes_pending)) {
6608 if (mddev->safemode == 2)
6609 md_wakeup_thread(mddev->thread);
6610 else if (mddev->safemode_delay)
6611 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
6615 /* md_allow_write(mddev)
6616 * Calling this ensures that the array is marked 'active' so that writes
6617 * may proceed without blocking. It is important to call this before
6618 * attempting a GFP_KERNEL allocation while holding the mddev lock.
6619 * Must be called with mddev_lock held.
6621 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
6622 * is dropped, so return -EAGAIN after notifying userspace.
6624 int md_allow_write(mddev_t *mddev)
6630 if (!mddev->pers->sync_request)
6633 spin_lock_irq(&mddev->write_lock);
6634 if (mddev->in_sync) {
6636 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6637 set_bit(MD_CHANGE_PENDING, &mddev->flags);
6638 if (mddev->safemode_delay &&
6639 mddev->safemode == 0)
6640 mddev->safemode = 1;
6641 spin_unlock_irq(&mddev->write_lock);
6642 md_update_sb(mddev, 0);
6643 sysfs_notify_dirent_safe(mddev->sysfs_state);
6645 spin_unlock_irq(&mddev->write_lock);
6647 if (test_bit(MD_CHANGE_PENDING, &mddev->flags))
6652 EXPORT_SYMBOL_GPL(md_allow_write);
6654 void md_unplug(mddev_t *mddev)
6657 blk_unplug(mddev->queue);
6659 mddev->plug->unplug_fn(mddev->plug);
6662 #define SYNC_MARKS 10
6663 #define SYNC_MARK_STEP (3*HZ)
6664 void md_do_sync(mddev_t *mddev)
6667 unsigned int currspeed = 0,
6669 sector_t max_sectors,j, io_sectors;
6670 unsigned long mark[SYNC_MARKS];
6671 sector_t mark_cnt[SYNC_MARKS];
6673 struct list_head *tmp;
6674 sector_t last_check;
6679 /* just incase thread restarts... */
6680 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
6682 if (mddev->ro) /* never try to sync a read-only array */
6685 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
6686 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
6687 desc = "data-check";
6688 else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
6689 desc = "requested-resync";
6692 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
6697 /* we overload curr_resync somewhat here.
6698 * 0 == not engaged in resync at all
6699 * 2 == checking that there is no conflict with another sync
6700 * 1 == like 2, but have yielded to allow conflicting resync to
6702 * other == active in resync - this many blocks
6704 * Before starting a resync we must have set curr_resync to
6705 * 2, and then checked that every "conflicting" array has curr_resync
6706 * less than ours. When we find one that is the same or higher
6707 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
6708 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
6709 * This will mean we have to start checking from the beginning again.
6714 mddev->curr_resync = 2;
6717 if (kthread_should_stop())
6718 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6720 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
6722 for_each_mddev(mddev2, tmp) {
6723 if (mddev2 == mddev)
6725 if (!mddev->parallel_resync
6726 && mddev2->curr_resync
6727 && match_mddev_units(mddev, mddev2)) {
6729 if (mddev < mddev2 && mddev->curr_resync == 2) {
6730 /* arbitrarily yield */
6731 mddev->curr_resync = 1;
6732 wake_up(&resync_wait);
6734 if (mddev > mddev2 && mddev->curr_resync == 1)
6735 /* no need to wait here, we can wait the next
6736 * time 'round when curr_resync == 2
6739 /* We need to wait 'interruptible' so as not to
6740 * contribute to the load average, and not to
6741 * be caught by 'softlockup'
6743 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
6744 if (!kthread_should_stop() &&
6745 mddev2->curr_resync >= mddev->curr_resync) {
6746 printk(KERN_INFO "md: delaying %s of %s"
6747 " until %s has finished (they"
6748 " share one or more physical units)\n",
6749 desc, mdname(mddev), mdname(mddev2));
6751 if (signal_pending(current))
6752 flush_signals(current);
6754 finish_wait(&resync_wait, &wq);
6757 finish_wait(&resync_wait, &wq);
6760 } while (mddev->curr_resync < 2);
6763 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
6764 /* resync follows the size requested by the personality,
6765 * which defaults to physical size, but can be virtual size
6767 max_sectors = mddev->resync_max_sectors;
6768 mddev->resync_mismatches = 0;
6769 /* we don't use the checkpoint if there's a bitmap */
6770 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
6771 j = mddev->resync_min;
6772 else if (!mddev->bitmap)
6773 j = mddev->recovery_cp;
6775 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
6776 max_sectors = mddev->dev_sectors;
6778 /* recovery follows the physical size of devices */
6779 max_sectors = mddev->dev_sectors;
6782 list_for_each_entry_rcu(rdev, &mddev->disks, same_set)
6783 if (rdev->raid_disk >= 0 &&
6784 !test_bit(Faulty, &rdev->flags) &&
6785 !test_bit(In_sync, &rdev->flags) &&
6786 rdev->recovery_offset < j)
6787 j = rdev->recovery_offset;
6791 printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev));
6792 printk(KERN_INFO "md: minimum _guaranteed_ speed:"
6793 " %d KB/sec/disk.\n", speed_min(mddev));
6794 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
6795 "(but not more than %d KB/sec) for %s.\n",
6796 speed_max(mddev), desc);
6798 is_mddev_idle(mddev, 1); /* this initializes IO event counters */
6801 for (m = 0; m < SYNC_MARKS; m++) {
6803 mark_cnt[m] = io_sectors;
6806 mddev->resync_mark = mark[last_mark];
6807 mddev->resync_mark_cnt = mark_cnt[last_mark];
6810 * Tune reconstruction:
6812 window = 32*(PAGE_SIZE/512);
6813 printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n",
6814 window/2,(unsigned long long) max_sectors/2);
6816 atomic_set(&mddev->recovery_active, 0);
6821 "md: resuming %s of %s from checkpoint.\n",
6822 desc, mdname(mddev));
6823 mddev->curr_resync = j;
6825 mddev->curr_resync_completed = mddev->curr_resync;
6827 while (j < max_sectors) {
6832 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
6833 ((mddev->curr_resync > mddev->curr_resync_completed &&
6834 (mddev->curr_resync - mddev->curr_resync_completed)
6835 > (max_sectors >> 4)) ||
6836 (j - mddev->curr_resync_completed)*2
6837 >= mddev->resync_max - mddev->curr_resync_completed
6839 /* time to update curr_resync_completed */
6841 wait_event(mddev->recovery_wait,
6842 atomic_read(&mddev->recovery_active) == 0);
6843 mddev->curr_resync_completed =
6845 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6846 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
6849 while (j >= mddev->resync_max && !kthread_should_stop()) {
6850 /* As this condition is controlled by user-space,
6851 * we can block indefinitely, so use '_interruptible'
6852 * to avoid triggering warnings.
6854 flush_signals(current); /* just in case */
6855 wait_event_interruptible(mddev->recovery_wait,
6856 mddev->resync_max > j
6857 || kthread_should_stop());
6860 if (kthread_should_stop())
6863 sectors = mddev->pers->sync_request(mddev, j, &skipped,
6864 currspeed < speed_min(mddev));
6866 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6870 if (!skipped) { /* actual IO requested */
6871 io_sectors += sectors;
6872 atomic_add(sectors, &mddev->recovery_active);
6876 if (j>1) mddev->curr_resync = j;
6877 mddev->curr_mark_cnt = io_sectors;
6878 if (last_check == 0)
6879 /* this is the earliers that rebuilt will be
6880 * visible in /proc/mdstat
6882 md_new_event(mddev);
6884 if (last_check + window > io_sectors || j == max_sectors)
6887 last_check = io_sectors;
6889 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
6893 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
6895 int next = (last_mark+1) % SYNC_MARKS;
6897 mddev->resync_mark = mark[next];
6898 mddev->resync_mark_cnt = mark_cnt[next];
6899 mark[next] = jiffies;
6900 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
6905 if (kthread_should_stop())
6910 * this loop exits only if either when we are slower than
6911 * the 'hard' speed limit, or the system was IO-idle for
6913 * the system might be non-idle CPU-wise, but we only care
6914 * about not overloading the IO subsystem. (things like an
6915 * e2fsck being done on the RAID array should execute fast)
6920 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
6921 /((jiffies-mddev->resync_mark)/HZ +1) +1;
6923 if (currspeed > speed_min(mddev)) {
6924 if ((currspeed > speed_max(mddev)) ||
6925 !is_mddev_idle(mddev, 0)) {
6931 printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc);
6933 * this also signals 'finished resyncing' to md_stop
6938 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
6940 /* tell personality that we are finished */
6941 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
6943 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
6944 mddev->curr_resync > 2) {
6945 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
6946 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
6947 if (mddev->curr_resync >= mddev->recovery_cp) {
6949 "md: checkpointing %s of %s.\n",
6950 desc, mdname(mddev));
6951 mddev->recovery_cp = mddev->curr_resync;
6954 mddev->recovery_cp = MaxSector;
6956 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
6957 mddev->curr_resync = MaxSector;
6959 list_for_each_entry_rcu(rdev, &mddev->disks, same_set)
6960 if (rdev->raid_disk >= 0 &&
6961 mddev->delta_disks >= 0 &&
6962 !test_bit(Faulty, &rdev->flags) &&
6963 !test_bit(In_sync, &rdev->flags) &&
6964 rdev->recovery_offset < mddev->curr_resync)
6965 rdev->recovery_offset = mddev->curr_resync;
6969 set_bit(MD_CHANGE_DEVS, &mddev->flags);
6972 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
6973 /* We completed so min/max setting can be forgotten if used. */
6974 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
6975 mddev->resync_min = 0;
6976 mddev->resync_max = MaxSector;
6977 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
6978 mddev->resync_min = mddev->curr_resync_completed;
6979 mddev->curr_resync = 0;
6980 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
6981 mddev->curr_resync_completed = 0;
6982 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
6983 wake_up(&resync_wait);
6984 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
6985 md_wakeup_thread(mddev->thread);
6990 * got a signal, exit.
6993 "md: md_do_sync() got signal ... exiting\n");
6994 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6998 EXPORT_SYMBOL_GPL(md_do_sync);
7001 static int remove_and_add_spares(mddev_t *mddev)
7006 mddev->curr_resync_completed = 0;
7008 list_for_each_entry(rdev, &mddev->disks, same_set)
7009 if (rdev->raid_disk >= 0 &&
7010 !test_bit(Blocked, &rdev->flags) &&
7011 (test_bit(Faulty, &rdev->flags) ||
7012 ! test_bit(In_sync, &rdev->flags)) &&
7013 atomic_read(&rdev->nr_pending)==0) {
7014 if (mddev->pers->hot_remove_disk(
7015 mddev, rdev->raid_disk)==0) {
7017 sprintf(nm,"rd%d", rdev->raid_disk);
7018 sysfs_remove_link(&mddev->kobj, nm);
7019 rdev->raid_disk = -1;
7023 if (mddev->degraded && ! mddev->ro && !mddev->recovery_disabled) {
7024 list_for_each_entry(rdev, &mddev->disks, same_set) {
7025 if (rdev->raid_disk >= 0 &&
7026 !test_bit(In_sync, &rdev->flags) &&
7027 !test_bit(Blocked, &rdev->flags))
7029 if (rdev->raid_disk < 0
7030 && !test_bit(Faulty, &rdev->flags)) {
7031 rdev->recovery_offset = 0;
7033 hot_add_disk(mddev, rdev) == 0) {
7035 sprintf(nm, "rd%d", rdev->raid_disk);
7036 if (sysfs_create_link(&mddev->kobj,
7038 /* failure here is OK */;
7040 md_new_event(mddev);
7041 set_bit(MD_CHANGE_DEVS, &mddev->flags);
7050 static void reap_sync_thread(mddev_t *mddev)
7054 /* resync has finished, collect result */
7055 md_unregister_thread(mddev->sync_thread);
7056 mddev->sync_thread = NULL;
7057 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
7058 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
7060 /* activate any spares */
7061 if (mddev->pers->spare_active(mddev))
7062 sysfs_notify(&mddev->kobj, NULL,
7065 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
7066 mddev->pers->finish_reshape)
7067 mddev->pers->finish_reshape(mddev);
7068 md_update_sb(mddev, 1);
7070 /* if array is no-longer degraded, then any saved_raid_disk
7071 * information must be scrapped
7073 if (!mddev->degraded)
7074 list_for_each_entry(rdev, &mddev->disks, same_set)
7075 rdev->saved_raid_disk = -1;
7077 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7078 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7079 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
7080 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
7081 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
7082 /* flag recovery needed just to double check */
7083 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7084 sysfs_notify_dirent_safe(mddev->sysfs_action);
7085 md_new_event(mddev);
7089 * This routine is regularly called by all per-raid-array threads to
7090 * deal with generic issues like resync and super-block update.
7091 * Raid personalities that don't have a thread (linear/raid0) do not
7092 * need this as they never do any recovery or update the superblock.
7094 * It does not do any resync itself, but rather "forks" off other threads
7095 * to do that as needed.
7096 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
7097 * "->recovery" and create a thread at ->sync_thread.
7098 * When the thread finishes it sets MD_RECOVERY_DONE
7099 * and wakeups up this thread which will reap the thread and finish up.
7100 * This thread also removes any faulty devices (with nr_pending == 0).
7102 * The overall approach is:
7103 * 1/ if the superblock needs updating, update it.
7104 * 2/ If a recovery thread is running, don't do anything else.
7105 * 3/ If recovery has finished, clean up, possibly marking spares active.
7106 * 4/ If there are any faulty devices, remove them.
7107 * 5/ If array is degraded, try to add spares devices
7108 * 6/ If array has spares or is not in-sync, start a resync thread.
7110 void md_check_recovery(mddev_t *mddev)
7113 bitmap_daemon_work(mddev);
7118 if (signal_pending(current)) {
7119 if (mddev->pers->sync_request && !mddev->external) {
7120 printk(KERN_INFO "md: %s in immediate safe mode\n",
7122 mddev->safemode = 2;
7124 flush_signals(current);
7127 if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
7130 (mddev->flags & ~ (1<<MD_CHANGE_PENDING)) ||
7131 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
7132 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
7133 (mddev->external == 0 && mddev->safemode == 1) ||
7134 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
7135 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
7139 if (mddev_trylock(mddev)) {
7143 /* Only thing we do on a ro array is remove
7146 remove_and_add_spares(mddev);
7147 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7151 if (!mddev->external) {
7153 spin_lock_irq(&mddev->write_lock);
7154 if (mddev->safemode &&
7155 !atomic_read(&mddev->writes_pending) &&
7157 mddev->recovery_cp == MaxSector) {
7160 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
7162 if (mddev->safemode == 1)
7163 mddev->safemode = 0;
7164 spin_unlock_irq(&mddev->write_lock);
7166 sysfs_notify_dirent_safe(mddev->sysfs_state);
7170 md_update_sb(mddev, 0);
7172 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
7173 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
7174 /* resync/recovery still happening */
7175 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7178 if (mddev->sync_thread) {
7179 reap_sync_thread(mddev);
7182 /* Set RUNNING before clearing NEEDED to avoid
7183 * any transients in the value of "sync_action".
7185 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7186 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7187 /* Clear some bits that don't mean anything, but
7190 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
7191 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
7193 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
7195 /* no recovery is running.
7196 * remove any failed drives, then
7197 * add spares if possible.
7198 * Spare are also removed and re-added, to allow
7199 * the personality to fail the re-add.
7202 if (mddev->reshape_position != MaxSector) {
7203 if (mddev->pers->check_reshape == NULL ||
7204 mddev->pers->check_reshape(mddev) != 0)
7205 /* Cannot proceed */
7207 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
7208 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7209 } else if ((spares = remove_and_add_spares(mddev))) {
7210 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7211 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
7212 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
7213 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7214 } else if (mddev->recovery_cp < MaxSector) {
7215 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7216 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7217 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
7218 /* nothing to be done ... */
7221 if (mddev->pers->sync_request) {
7222 if (spares && mddev->bitmap && ! mddev->bitmap->file) {
7223 /* We are adding a device or devices to an array
7224 * which has the bitmap stored on all devices.
7225 * So make sure all bitmap pages get written
7227 bitmap_write_all(mddev->bitmap);
7229 mddev->sync_thread = md_register_thread(md_do_sync,
7232 if (!mddev->sync_thread) {
7233 printk(KERN_ERR "%s: could not start resync"
7236 /* leave the spares where they are, it shouldn't hurt */
7237 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7238 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7239 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
7240 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
7241 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
7243 md_wakeup_thread(mddev->sync_thread);
7244 sysfs_notify_dirent_safe(mddev->sysfs_action);
7245 md_new_event(mddev);
7248 if (!mddev->sync_thread) {
7249 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7250 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
7252 if (mddev->sysfs_action)
7253 sysfs_notify_dirent_safe(mddev->sysfs_action);
7255 mddev_unlock(mddev);
7259 void md_wait_for_blocked_rdev(mdk_rdev_t *rdev, mddev_t *mddev)
7261 sysfs_notify_dirent_safe(rdev->sysfs_state);
7262 wait_event_timeout(rdev->blocked_wait,
7263 !test_bit(Blocked, &rdev->flags),
7264 msecs_to_jiffies(5000));
7265 rdev_dec_pending(rdev, mddev);
7267 EXPORT_SYMBOL(md_wait_for_blocked_rdev);
7269 static int md_notify_reboot(struct notifier_block *this,
7270 unsigned long code, void *x)
7272 struct list_head *tmp;
7275 if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) {
7277 printk(KERN_INFO "md: stopping all md devices.\n");
7279 for_each_mddev(mddev, tmp)
7280 if (mddev_trylock(mddev)) {
7281 /* Force a switch to readonly even array
7282 * appears to still be in use. Hence
7285 md_set_readonly(mddev, 100);
7286 mddev_unlock(mddev);
7289 * certain more exotic SCSI devices are known to be
7290 * volatile wrt too early system reboots. While the
7291 * right place to handle this issue is the given
7292 * driver, we do want to have a safe RAID driver ...
7299 static struct notifier_block md_notifier = {
7300 .notifier_call = md_notify_reboot,
7302 .priority = INT_MAX, /* before any real devices */
7305 static void md_geninit(void)
7307 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
7309 proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops);
7312 static int __init md_init(void)
7316 md_wq = alloc_workqueue("md", WQ_RESCUER, 0);
7320 md_misc_wq = alloc_workqueue("md_misc", 0, 0);
7324 if ((ret = register_blkdev(MD_MAJOR, "md")) < 0)
7327 if ((ret = register_blkdev(0, "mdp")) < 0)
7331 blk_register_region(MKDEV(MD_MAJOR, 0), 1UL<<MINORBITS, THIS_MODULE,
7332 md_probe, NULL, NULL);
7333 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
7334 md_probe, NULL, NULL);
7336 register_reboot_notifier(&md_notifier);
7337 raid_table_header = register_sysctl_table(raid_root_table);
7343 unregister_blkdev(MD_MAJOR, "md");
7345 destroy_workqueue(md_misc_wq);
7347 destroy_workqueue(md_wq);
7355 * Searches all registered partitions for autorun RAID arrays
7359 static LIST_HEAD(all_detected_devices);
7360 struct detected_devices_node {
7361 struct list_head list;
7365 void md_autodetect_dev(dev_t dev)
7367 struct detected_devices_node *node_detected_dev;
7369 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
7370 if (node_detected_dev) {
7371 node_detected_dev->dev = dev;
7372 list_add_tail(&node_detected_dev->list, &all_detected_devices);
7374 printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed"
7375 ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev));
7380 static void autostart_arrays(int part)
7383 struct detected_devices_node *node_detected_dev;
7385 int i_scanned, i_passed;
7390 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
7392 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
7394 node_detected_dev = list_entry(all_detected_devices.next,
7395 struct detected_devices_node, list);
7396 list_del(&node_detected_dev->list);
7397 dev = node_detected_dev->dev;
7398 kfree(node_detected_dev);
7399 rdev = md_import_device(dev,0, 90);
7403 if (test_bit(Faulty, &rdev->flags)) {
7407 set_bit(AutoDetected, &rdev->flags);
7408 list_add(&rdev->same_set, &pending_raid_disks);
7412 printk(KERN_INFO "md: Scanned %d and added %d devices.\n",
7413 i_scanned, i_passed);
7415 autorun_devices(part);
7418 #endif /* !MODULE */
7420 static __exit void md_exit(void)
7423 struct list_head *tmp;
7425 blk_unregister_region(MKDEV(MD_MAJOR,0), 1U << MINORBITS);
7426 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
7428 unregister_blkdev(MD_MAJOR,"md");
7429 unregister_blkdev(mdp_major, "mdp");
7430 unregister_reboot_notifier(&md_notifier);
7431 unregister_sysctl_table(raid_table_header);
7432 remove_proc_entry("mdstat", NULL);
7433 for_each_mddev(mddev, tmp) {
7434 export_array(mddev);
7435 mddev->hold_active = 0;
7437 destroy_workqueue(md_misc_wq);
7438 destroy_workqueue(md_wq);
7441 subsys_initcall(md_init);
7442 module_exit(md_exit)
7444 static int get_ro(char *buffer, struct kernel_param *kp)
7446 return sprintf(buffer, "%d", start_readonly);
7448 static int set_ro(const char *val, struct kernel_param *kp)
7451 int num = simple_strtoul(val, &e, 10);
7452 if (*val && (*e == '\0' || *e == '\n')) {
7453 start_readonly = num;
7459 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
7460 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
7462 module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR);
7464 EXPORT_SYMBOL(register_md_personality);
7465 EXPORT_SYMBOL(unregister_md_personality);
7466 EXPORT_SYMBOL(md_error);
7467 EXPORT_SYMBOL(md_done_sync);
7468 EXPORT_SYMBOL(md_write_start);
7469 EXPORT_SYMBOL(md_write_end);
7470 EXPORT_SYMBOL(md_register_thread);
7471 EXPORT_SYMBOL(md_unregister_thread);
7472 EXPORT_SYMBOL(md_wakeup_thread);
7473 EXPORT_SYMBOL(md_check_recovery);
7474 MODULE_LICENSE("GPL");
7475 MODULE_DESCRIPTION("MD RAID framework");
7477 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);