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(struct block_device *bdev)
710 sector_t num_sectors = i_size_read(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)
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;
807 bio->bi_sector = sector;
808 bio_add_page(bio, page, size, 0);
809 init_completion(&event);
810 bio->bi_private = &event;
811 bio->bi_end_io = bi_complete;
813 wait_for_completion(&event);
815 ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
819 EXPORT_SYMBOL_GPL(sync_page_io);
821 static int read_disk_sb(mdk_rdev_t * rdev, int size)
823 char b[BDEVNAME_SIZE];
824 if (!rdev->sb_page) {
832 if (!sync_page_io(rdev, rdev->sb_start, size, rdev->sb_page, READ))
838 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
839 bdevname(rdev->bdev,b));
843 static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
845 return sb1->set_uuid0 == sb2->set_uuid0 &&
846 sb1->set_uuid1 == sb2->set_uuid1 &&
847 sb1->set_uuid2 == sb2->set_uuid2 &&
848 sb1->set_uuid3 == sb2->set_uuid3;
851 static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
854 mdp_super_t *tmp1, *tmp2;
856 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
857 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
859 if (!tmp1 || !tmp2) {
861 printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n");
869 * nr_disks is not constant
874 ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0);
882 static u32 md_csum_fold(u32 csum)
884 csum = (csum & 0xffff) + (csum >> 16);
885 return (csum & 0xffff) + (csum >> 16);
888 static unsigned int calc_sb_csum(mdp_super_t * sb)
891 u32 *sb32 = (u32*)sb;
893 unsigned int disk_csum, csum;
895 disk_csum = sb->sb_csum;
898 for (i = 0; i < MD_SB_BYTES/4 ; i++)
900 csum = (newcsum & 0xffffffff) + (newcsum>>32);
904 /* This used to use csum_partial, which was wrong for several
905 * reasons including that different results are returned on
906 * different architectures. It isn't critical that we get exactly
907 * the same return value as before (we always csum_fold before
908 * testing, and that removes any differences). However as we
909 * know that csum_partial always returned a 16bit value on
910 * alphas, do a fold to maximise conformity to previous behaviour.
912 sb->sb_csum = md_csum_fold(disk_csum);
914 sb->sb_csum = disk_csum;
921 * Handle superblock details.
922 * We want to be able to handle multiple superblock formats
923 * so we have a common interface to them all, and an array of
924 * different handlers.
925 * We rely on user-space to write the initial superblock, and support
926 * reading and updating of superblocks.
927 * Interface methods are:
928 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
929 * loads and validates a superblock on dev.
930 * if refdev != NULL, compare superblocks on both devices
932 * 0 - dev has a superblock that is compatible with refdev
933 * 1 - dev has a superblock that is compatible and newer than refdev
934 * so dev should be used as the refdev in future
935 * -EINVAL superblock incompatible or invalid
936 * -othererror e.g. -EIO
938 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
939 * Verify that dev is acceptable into mddev.
940 * The first time, mddev->raid_disks will be 0, and data from
941 * dev should be merged in. Subsequent calls check that dev
942 * is new enough. Return 0 or -EINVAL
944 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
945 * Update the superblock for rdev with data in mddev
946 * This does not write to disc.
952 struct module *owner;
953 int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev,
955 int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev);
956 void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev);
957 unsigned long long (*rdev_size_change)(mdk_rdev_t *rdev,
958 sector_t num_sectors);
962 * Check that the given mddev has no bitmap.
964 * This function is called from the run method of all personalities that do not
965 * support bitmaps. It prints an error message and returns non-zero if mddev
966 * has a bitmap. Otherwise, it returns 0.
969 int md_check_no_bitmap(mddev_t *mddev)
971 if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset)
973 printk(KERN_ERR "%s: bitmaps are not supported for %s\n",
974 mdname(mddev), mddev->pers->name);
977 EXPORT_SYMBOL(md_check_no_bitmap);
980 * load_super for 0.90.0
982 static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
984 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
989 * Calculate the position of the superblock (512byte sectors),
990 * it's at the end of the disk.
992 * It also happens to be a multiple of 4Kb.
994 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
996 ret = read_disk_sb(rdev, MD_SB_BYTES);
1001 bdevname(rdev->bdev, b);
1002 sb = (mdp_super_t*)page_address(rdev->sb_page);
1004 if (sb->md_magic != MD_SB_MAGIC) {
1005 printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
1010 if (sb->major_version != 0 ||
1011 sb->minor_version < 90 ||
1012 sb->minor_version > 91) {
1013 printk(KERN_WARNING "Bad version number %d.%d on %s\n",
1014 sb->major_version, sb->minor_version,
1019 if (sb->raid_disks <= 0)
1022 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
1023 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
1028 rdev->preferred_minor = sb->md_minor;
1029 rdev->data_offset = 0;
1030 rdev->sb_size = MD_SB_BYTES;
1032 if (sb->level == LEVEL_MULTIPATH)
1035 rdev->desc_nr = sb->this_disk.number;
1041 mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page);
1042 if (!uuid_equal(refsb, sb)) {
1043 printk(KERN_WARNING "md: %s has different UUID to %s\n",
1044 b, bdevname(refdev->bdev,b2));
1047 if (!sb_equal(refsb, sb)) {
1048 printk(KERN_WARNING "md: %s has same UUID"
1049 " but different superblock to %s\n",
1050 b, bdevname(refdev->bdev, b2));
1054 ev2 = md_event(refsb);
1060 rdev->sectors = rdev->sb_start;
1062 if (rdev->sectors < sb->size * 2 && sb->level > 1)
1063 /* "this cannot possibly happen" ... */
1071 * validate_super for 0.90.0
1073 static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
1076 mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page);
1077 __u64 ev1 = md_event(sb);
1079 rdev->raid_disk = -1;
1080 clear_bit(Faulty, &rdev->flags);
1081 clear_bit(In_sync, &rdev->flags);
1082 clear_bit(WriteMostly, &rdev->flags);
1084 if (mddev->raid_disks == 0) {
1085 mddev->major_version = 0;
1086 mddev->minor_version = sb->minor_version;
1087 mddev->patch_version = sb->patch_version;
1088 mddev->external = 0;
1089 mddev->chunk_sectors = sb->chunk_size >> 9;
1090 mddev->ctime = sb->ctime;
1091 mddev->utime = sb->utime;
1092 mddev->level = sb->level;
1093 mddev->clevel[0] = 0;
1094 mddev->layout = sb->layout;
1095 mddev->raid_disks = sb->raid_disks;
1096 mddev->dev_sectors = sb->size * 2;
1097 mddev->events = ev1;
1098 mddev->bitmap_info.offset = 0;
1099 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
1101 if (mddev->minor_version >= 91) {
1102 mddev->reshape_position = sb->reshape_position;
1103 mddev->delta_disks = sb->delta_disks;
1104 mddev->new_level = sb->new_level;
1105 mddev->new_layout = sb->new_layout;
1106 mddev->new_chunk_sectors = sb->new_chunk >> 9;
1108 mddev->reshape_position = MaxSector;
1109 mddev->delta_disks = 0;
1110 mddev->new_level = mddev->level;
1111 mddev->new_layout = mddev->layout;
1112 mddev->new_chunk_sectors = mddev->chunk_sectors;
1115 if (sb->state & (1<<MD_SB_CLEAN))
1116 mddev->recovery_cp = MaxSector;
1118 if (sb->events_hi == sb->cp_events_hi &&
1119 sb->events_lo == sb->cp_events_lo) {
1120 mddev->recovery_cp = sb->recovery_cp;
1122 mddev->recovery_cp = 0;
1125 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
1126 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
1127 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
1128 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
1130 mddev->max_disks = MD_SB_DISKS;
1132 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
1133 mddev->bitmap_info.file == NULL)
1134 mddev->bitmap_info.offset =
1135 mddev->bitmap_info.default_offset;
1137 } else if (mddev->pers == NULL) {
1138 /* Insist on good event counter while assembling, except
1139 * for spares (which don't need an event count) */
1141 if (sb->disks[rdev->desc_nr].state & (
1142 (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE)))
1143 if (ev1 < mddev->events)
1145 } else if (mddev->bitmap) {
1146 /* if adding to array with a bitmap, then we can accept an
1147 * older device ... but not too old.
1149 if (ev1 < mddev->bitmap->events_cleared)
1152 if (ev1 < mddev->events)
1153 /* just a hot-add of a new device, leave raid_disk at -1 */
1157 if (mddev->level != LEVEL_MULTIPATH) {
1158 desc = sb->disks + rdev->desc_nr;
1160 if (desc->state & (1<<MD_DISK_FAULTY))
1161 set_bit(Faulty, &rdev->flags);
1162 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
1163 desc->raid_disk < mddev->raid_disks */) {
1164 set_bit(In_sync, &rdev->flags);
1165 rdev->raid_disk = desc->raid_disk;
1166 } else if (desc->state & (1<<MD_DISK_ACTIVE)) {
1167 /* active but not in sync implies recovery up to
1168 * reshape position. We don't know exactly where
1169 * that is, so set to zero for now */
1170 if (mddev->minor_version >= 91) {
1171 rdev->recovery_offset = 0;
1172 rdev->raid_disk = desc->raid_disk;
1175 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
1176 set_bit(WriteMostly, &rdev->flags);
1177 } else /* MULTIPATH are always insync */
1178 set_bit(In_sync, &rdev->flags);
1183 * sync_super for 0.90.0
1185 static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1189 int next_spare = mddev->raid_disks;
1192 /* make rdev->sb match mddev data..
1195 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1196 * 3/ any empty disks < next_spare become removed
1198 * disks[0] gets initialised to REMOVED because
1199 * we cannot be sure from other fields if it has
1200 * been initialised or not.
1203 int active=0, working=0,failed=0,spare=0,nr_disks=0;
1205 rdev->sb_size = MD_SB_BYTES;
1207 sb = (mdp_super_t*)page_address(rdev->sb_page);
1209 memset(sb, 0, sizeof(*sb));
1211 sb->md_magic = MD_SB_MAGIC;
1212 sb->major_version = mddev->major_version;
1213 sb->patch_version = mddev->patch_version;
1214 sb->gvalid_words = 0; /* ignored */
1215 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
1216 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
1217 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
1218 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
1220 sb->ctime = mddev->ctime;
1221 sb->level = mddev->level;
1222 sb->size = mddev->dev_sectors / 2;
1223 sb->raid_disks = mddev->raid_disks;
1224 sb->md_minor = mddev->md_minor;
1225 sb->not_persistent = 0;
1226 sb->utime = mddev->utime;
1228 sb->events_hi = (mddev->events>>32);
1229 sb->events_lo = (u32)mddev->events;
1231 if (mddev->reshape_position == MaxSector)
1232 sb->minor_version = 90;
1234 sb->minor_version = 91;
1235 sb->reshape_position = mddev->reshape_position;
1236 sb->new_level = mddev->new_level;
1237 sb->delta_disks = mddev->delta_disks;
1238 sb->new_layout = mddev->new_layout;
1239 sb->new_chunk = mddev->new_chunk_sectors << 9;
1241 mddev->minor_version = sb->minor_version;
1244 sb->recovery_cp = mddev->recovery_cp;
1245 sb->cp_events_hi = (mddev->events>>32);
1246 sb->cp_events_lo = (u32)mddev->events;
1247 if (mddev->recovery_cp == MaxSector)
1248 sb->state = (1<< MD_SB_CLEAN);
1250 sb->recovery_cp = 0;
1252 sb->layout = mddev->layout;
1253 sb->chunk_size = mddev->chunk_sectors << 9;
1255 if (mddev->bitmap && mddev->bitmap_info.file == NULL)
1256 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
1258 sb->disks[0].state = (1<<MD_DISK_REMOVED);
1259 list_for_each_entry(rdev2, &mddev->disks, same_set) {
1262 int is_active = test_bit(In_sync, &rdev2->flags);
1264 if (rdev2->raid_disk >= 0 &&
1265 sb->minor_version >= 91)
1266 /* we have nowhere to store the recovery_offset,
1267 * but if it is not below the reshape_position,
1268 * we can piggy-back on that.
1271 if (rdev2->raid_disk < 0 ||
1272 test_bit(Faulty, &rdev2->flags))
1275 desc_nr = rdev2->raid_disk;
1277 desc_nr = next_spare++;
1278 rdev2->desc_nr = desc_nr;
1279 d = &sb->disks[rdev2->desc_nr];
1281 d->number = rdev2->desc_nr;
1282 d->major = MAJOR(rdev2->bdev->bd_dev);
1283 d->minor = MINOR(rdev2->bdev->bd_dev);
1285 d->raid_disk = rdev2->raid_disk;
1287 d->raid_disk = rdev2->desc_nr; /* compatibility */
1288 if (test_bit(Faulty, &rdev2->flags))
1289 d->state = (1<<MD_DISK_FAULTY);
1290 else if (is_active) {
1291 d->state = (1<<MD_DISK_ACTIVE);
1292 if (test_bit(In_sync, &rdev2->flags))
1293 d->state |= (1<<MD_DISK_SYNC);
1301 if (test_bit(WriteMostly, &rdev2->flags))
1302 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1304 /* now set the "removed" and "faulty" bits on any missing devices */
1305 for (i=0 ; i < mddev->raid_disks ; i++) {
1306 mdp_disk_t *d = &sb->disks[i];
1307 if (d->state == 0 && d->number == 0) {
1310 d->state = (1<<MD_DISK_REMOVED);
1311 d->state |= (1<<MD_DISK_FAULTY);
1315 sb->nr_disks = nr_disks;
1316 sb->active_disks = active;
1317 sb->working_disks = working;
1318 sb->failed_disks = failed;
1319 sb->spare_disks = spare;
1321 sb->this_disk = sb->disks[rdev->desc_nr];
1322 sb->sb_csum = calc_sb_csum(sb);
1326 * rdev_size_change for 0.90.0
1328 static unsigned long long
1329 super_90_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors)
1331 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1332 return 0; /* component must fit device */
1333 if (rdev->mddev->bitmap_info.offset)
1334 return 0; /* can't move bitmap */
1335 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
1336 if (!num_sectors || num_sectors > rdev->sb_start)
1337 num_sectors = rdev->sb_start;
1338 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1340 md_super_wait(rdev->mddev);
1346 * version 1 superblock
1349 static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb)
1353 unsigned long long newcsum;
1354 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1355 __le32 *isuper = (__le32*)sb;
1358 disk_csum = sb->sb_csum;
1361 for (i=0; size>=4; size -= 4 )
1362 newcsum += le32_to_cpu(*isuper++);
1365 newcsum += le16_to_cpu(*(__le16*) isuper);
1367 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1368 sb->sb_csum = disk_csum;
1369 return cpu_to_le32(csum);
1372 static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
1374 struct mdp_superblock_1 *sb;
1377 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1381 * Calculate the position of the superblock in 512byte sectors.
1382 * It is always aligned to a 4K boundary and
1383 * depeding on minor_version, it can be:
1384 * 0: At least 8K, but less than 12K, from end of device
1385 * 1: At start of device
1386 * 2: 4K from start of device.
1388 switch(minor_version) {
1390 sb_start = i_size_read(rdev->bdev->bd_inode) >> 9;
1392 sb_start &= ~(sector_t)(4*2-1);
1403 rdev->sb_start = sb_start;
1405 /* superblock is rarely larger than 1K, but it can be larger,
1406 * and it is safe to read 4k, so we do that
1408 ret = read_disk_sb(rdev, 4096);
1409 if (ret) return ret;
1412 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1414 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1415 sb->major_version != cpu_to_le32(1) ||
1416 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1417 le64_to_cpu(sb->super_offset) != rdev->sb_start ||
1418 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1421 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1422 printk("md: invalid superblock checksum on %s\n",
1423 bdevname(rdev->bdev,b));
1426 if (le64_to_cpu(sb->data_size) < 10) {
1427 printk("md: data_size too small on %s\n",
1428 bdevname(rdev->bdev,b));
1432 rdev->preferred_minor = 0xffff;
1433 rdev->data_offset = le64_to_cpu(sb->data_offset);
1434 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1436 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1437 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1438 if (rdev->sb_size & bmask)
1439 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1442 && rdev->data_offset < sb_start + (rdev->sb_size/512))
1445 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1448 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1454 struct mdp_superblock_1 *refsb =
1455 (struct mdp_superblock_1*)page_address(refdev->sb_page);
1457 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1458 sb->level != refsb->level ||
1459 sb->layout != refsb->layout ||
1460 sb->chunksize != refsb->chunksize) {
1461 printk(KERN_WARNING "md: %s has strangely different"
1462 " superblock to %s\n",
1463 bdevname(rdev->bdev,b),
1464 bdevname(refdev->bdev,b2));
1467 ev1 = le64_to_cpu(sb->events);
1468 ev2 = le64_to_cpu(refsb->events);
1476 rdev->sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) -
1477 le64_to_cpu(sb->data_offset);
1479 rdev->sectors = rdev->sb_start;
1480 if (rdev->sectors < le64_to_cpu(sb->data_size))
1482 rdev->sectors = le64_to_cpu(sb->data_size);
1483 if (le64_to_cpu(sb->size) > rdev->sectors)
1488 static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
1490 struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1491 __u64 ev1 = le64_to_cpu(sb->events);
1493 rdev->raid_disk = -1;
1494 clear_bit(Faulty, &rdev->flags);
1495 clear_bit(In_sync, &rdev->flags);
1496 clear_bit(WriteMostly, &rdev->flags);
1498 if (mddev->raid_disks == 0) {
1499 mddev->major_version = 1;
1500 mddev->patch_version = 0;
1501 mddev->external = 0;
1502 mddev->chunk_sectors = le32_to_cpu(sb->chunksize);
1503 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1504 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1505 mddev->level = le32_to_cpu(sb->level);
1506 mddev->clevel[0] = 0;
1507 mddev->layout = le32_to_cpu(sb->layout);
1508 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1509 mddev->dev_sectors = le64_to_cpu(sb->size);
1510 mddev->events = ev1;
1511 mddev->bitmap_info.offset = 0;
1512 mddev->bitmap_info.default_offset = 1024 >> 9;
1514 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1515 memcpy(mddev->uuid, sb->set_uuid, 16);
1517 mddev->max_disks = (4096-256)/2;
1519 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1520 mddev->bitmap_info.file == NULL )
1521 mddev->bitmap_info.offset =
1522 (__s32)le32_to_cpu(sb->bitmap_offset);
1524 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1525 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1526 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1527 mddev->new_level = le32_to_cpu(sb->new_level);
1528 mddev->new_layout = le32_to_cpu(sb->new_layout);
1529 mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk);
1531 mddev->reshape_position = MaxSector;
1532 mddev->delta_disks = 0;
1533 mddev->new_level = mddev->level;
1534 mddev->new_layout = mddev->layout;
1535 mddev->new_chunk_sectors = mddev->chunk_sectors;
1538 } else if (mddev->pers == NULL) {
1539 /* Insist of good event counter while assembling, except for
1540 * spares (which don't need an event count) */
1542 if (rdev->desc_nr >= 0 &&
1543 rdev->desc_nr < le32_to_cpu(sb->max_dev) &&
1544 le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < 0xfffe)
1545 if (ev1 < mddev->events)
1547 } else if (mddev->bitmap) {
1548 /* If adding to array with a bitmap, then we can accept an
1549 * older device, but not too old.
1551 if (ev1 < mddev->bitmap->events_cleared)
1554 if (ev1 < mddev->events)
1555 /* just a hot-add of a new device, leave raid_disk at -1 */
1558 if (mddev->level != LEVEL_MULTIPATH) {
1560 if (rdev->desc_nr < 0 ||
1561 rdev->desc_nr >= le32_to_cpu(sb->max_dev)) {
1565 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1567 case 0xffff: /* spare */
1569 case 0xfffe: /* faulty */
1570 set_bit(Faulty, &rdev->flags);
1573 if ((le32_to_cpu(sb->feature_map) &
1574 MD_FEATURE_RECOVERY_OFFSET))
1575 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1577 set_bit(In_sync, &rdev->flags);
1578 rdev->raid_disk = role;
1581 if (sb->devflags & WriteMostly1)
1582 set_bit(WriteMostly, &rdev->flags);
1583 } else /* MULTIPATH are always insync */
1584 set_bit(In_sync, &rdev->flags);
1589 static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1591 struct mdp_superblock_1 *sb;
1594 /* make rdev->sb match mddev and rdev data. */
1596 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1598 sb->feature_map = 0;
1600 sb->recovery_offset = cpu_to_le64(0);
1601 memset(sb->pad1, 0, sizeof(sb->pad1));
1602 memset(sb->pad2, 0, sizeof(sb->pad2));
1603 memset(sb->pad3, 0, sizeof(sb->pad3));
1605 sb->utime = cpu_to_le64((__u64)mddev->utime);
1606 sb->events = cpu_to_le64(mddev->events);
1608 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1610 sb->resync_offset = cpu_to_le64(0);
1612 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
1614 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
1615 sb->size = cpu_to_le64(mddev->dev_sectors);
1616 sb->chunksize = cpu_to_le32(mddev->chunk_sectors);
1617 sb->level = cpu_to_le32(mddev->level);
1618 sb->layout = cpu_to_le32(mddev->layout);
1620 if (mddev->bitmap && mddev->bitmap_info.file == NULL) {
1621 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset);
1622 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
1625 if (rdev->raid_disk >= 0 &&
1626 !test_bit(In_sync, &rdev->flags)) {
1628 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1629 sb->recovery_offset =
1630 cpu_to_le64(rdev->recovery_offset);
1633 if (mddev->reshape_position != MaxSector) {
1634 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1635 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1636 sb->new_layout = cpu_to_le32(mddev->new_layout);
1637 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1638 sb->new_level = cpu_to_le32(mddev->new_level);
1639 sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors);
1643 list_for_each_entry(rdev2, &mddev->disks, same_set)
1644 if (rdev2->desc_nr+1 > max_dev)
1645 max_dev = rdev2->desc_nr+1;
1647 if (max_dev > le32_to_cpu(sb->max_dev)) {
1649 sb->max_dev = cpu_to_le32(max_dev);
1650 rdev->sb_size = max_dev * 2 + 256;
1651 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1652 if (rdev->sb_size & bmask)
1653 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1655 max_dev = le32_to_cpu(sb->max_dev);
1657 for (i=0; i<max_dev;i++)
1658 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1660 list_for_each_entry(rdev2, &mddev->disks, same_set) {
1662 if (test_bit(Faulty, &rdev2->flags))
1663 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1664 else if (test_bit(In_sync, &rdev2->flags))
1665 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1666 else if (rdev2->raid_disk >= 0)
1667 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1669 sb->dev_roles[i] = cpu_to_le16(0xffff);
1672 sb->sb_csum = calc_sb_1_csum(sb);
1675 static unsigned long long
1676 super_1_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors)
1678 struct mdp_superblock_1 *sb;
1679 sector_t max_sectors;
1680 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1681 return 0; /* component must fit device */
1682 if (rdev->sb_start < rdev->data_offset) {
1683 /* minor versions 1 and 2; superblock before data */
1684 max_sectors = i_size_read(rdev->bdev->bd_inode) >> 9;
1685 max_sectors -= rdev->data_offset;
1686 if (!num_sectors || num_sectors > max_sectors)
1687 num_sectors = max_sectors;
1688 } else if (rdev->mddev->bitmap_info.offset) {
1689 /* minor version 0 with bitmap we can't move */
1692 /* minor version 0; superblock after data */
1694 sb_start = (i_size_read(rdev->bdev->bd_inode) >> 9) - 8*2;
1695 sb_start &= ~(sector_t)(4*2 - 1);
1696 max_sectors = rdev->sectors + sb_start - rdev->sb_start;
1697 if (!num_sectors || num_sectors > max_sectors)
1698 num_sectors = max_sectors;
1699 rdev->sb_start = sb_start;
1701 sb = (struct mdp_superblock_1 *) page_address(rdev->sb_page);
1702 sb->data_size = cpu_to_le64(num_sectors);
1703 sb->super_offset = rdev->sb_start;
1704 sb->sb_csum = calc_sb_1_csum(sb);
1705 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1707 md_super_wait(rdev->mddev);
1711 static struct super_type super_types[] = {
1714 .owner = THIS_MODULE,
1715 .load_super = super_90_load,
1716 .validate_super = super_90_validate,
1717 .sync_super = super_90_sync,
1718 .rdev_size_change = super_90_rdev_size_change,
1722 .owner = THIS_MODULE,
1723 .load_super = super_1_load,
1724 .validate_super = super_1_validate,
1725 .sync_super = super_1_sync,
1726 .rdev_size_change = super_1_rdev_size_change,
1730 static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)
1732 mdk_rdev_t *rdev, *rdev2;
1735 rdev_for_each_rcu(rdev, mddev1)
1736 rdev_for_each_rcu(rdev2, mddev2)
1737 if (rdev->bdev->bd_contains ==
1738 rdev2->bdev->bd_contains) {
1746 static LIST_HEAD(pending_raid_disks);
1749 * Try to register data integrity profile for an mddev
1751 * This is called when an array is started and after a disk has been kicked
1752 * from the array. It only succeeds if all working and active component devices
1753 * are integrity capable with matching profiles.
1755 int md_integrity_register(mddev_t *mddev)
1757 mdk_rdev_t *rdev, *reference = NULL;
1759 if (list_empty(&mddev->disks))
1760 return 0; /* nothing to do */
1761 if (blk_get_integrity(mddev->gendisk))
1762 return 0; /* already registered */
1763 list_for_each_entry(rdev, &mddev->disks, same_set) {
1764 /* skip spares and non-functional disks */
1765 if (test_bit(Faulty, &rdev->flags))
1767 if (rdev->raid_disk < 0)
1770 * If at least one rdev is not integrity capable, we can not
1771 * enable data integrity for the md device.
1773 if (!bdev_get_integrity(rdev->bdev))
1776 /* Use the first rdev as the reference */
1780 /* does this rdev's profile match the reference profile? */
1781 if (blk_integrity_compare(reference->bdev->bd_disk,
1782 rdev->bdev->bd_disk) < 0)
1786 * All component devices are integrity capable and have matching
1787 * profiles, register the common profile for the md device.
1789 if (blk_integrity_register(mddev->gendisk,
1790 bdev_get_integrity(reference->bdev)) != 0) {
1791 printk(KERN_ERR "md: failed to register integrity for %s\n",
1795 printk(KERN_NOTICE "md: data integrity on %s enabled\n",
1799 EXPORT_SYMBOL(md_integrity_register);
1801 /* Disable data integrity if non-capable/non-matching disk is being added */
1802 void md_integrity_add_rdev(mdk_rdev_t *rdev, mddev_t *mddev)
1804 struct blk_integrity *bi_rdev = bdev_get_integrity(rdev->bdev);
1805 struct blk_integrity *bi_mddev = blk_get_integrity(mddev->gendisk);
1807 if (!bi_mddev) /* nothing to do */
1809 if (rdev->raid_disk < 0) /* skip spares */
1811 if (bi_rdev && blk_integrity_compare(mddev->gendisk,
1812 rdev->bdev->bd_disk) >= 0)
1814 printk(KERN_NOTICE "disabling data integrity on %s\n", mdname(mddev));
1815 blk_integrity_unregister(mddev->gendisk);
1817 EXPORT_SYMBOL(md_integrity_add_rdev);
1819 static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
1821 char b[BDEVNAME_SIZE];
1831 /* prevent duplicates */
1832 if (find_rdev(mddev, rdev->bdev->bd_dev))
1835 /* make sure rdev->sectors exceeds mddev->dev_sectors */
1836 if (rdev->sectors && (mddev->dev_sectors == 0 ||
1837 rdev->sectors < mddev->dev_sectors)) {
1839 /* Cannot change size, so fail
1840 * If mddev->level <= 0, then we don't care
1841 * about aligning sizes (e.g. linear)
1843 if (mddev->level > 0)
1846 mddev->dev_sectors = rdev->sectors;
1849 /* Verify rdev->desc_nr is unique.
1850 * If it is -1, assign a free number, else
1851 * check number is not in use
1853 if (rdev->desc_nr < 0) {
1855 if (mddev->pers) choice = mddev->raid_disks;
1856 while (find_rdev_nr(mddev, choice))
1858 rdev->desc_nr = choice;
1860 if (find_rdev_nr(mddev, rdev->desc_nr))
1863 if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) {
1864 printk(KERN_WARNING "md: %s: array is limited to %d devices\n",
1865 mdname(mddev), mddev->max_disks);
1868 bdevname(rdev->bdev,b);
1869 while ( (s=strchr(b, '/')) != NULL)
1872 rdev->mddev = mddev;
1873 printk(KERN_INFO "md: bind<%s>\n", b);
1875 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
1878 ko = &part_to_dev(rdev->bdev->bd_part)->kobj;
1879 if (sysfs_create_link(&rdev->kobj, ko, "block"))
1880 /* failure here is OK */;
1881 rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state");
1883 list_add_rcu(&rdev->same_set, &mddev->disks);
1884 bd_claim_by_disk(rdev->bdev, rdev->bdev->bd_holder, mddev->gendisk);
1886 /* May as well allow recovery to be retried once */
1887 mddev->recovery_disabled = 0;
1892 printk(KERN_WARNING "md: failed to register dev-%s for %s\n",
1897 static void md_delayed_delete(struct work_struct *ws)
1899 mdk_rdev_t *rdev = container_of(ws, mdk_rdev_t, del_work);
1900 kobject_del(&rdev->kobj);
1901 kobject_put(&rdev->kobj);
1904 static void unbind_rdev_from_array(mdk_rdev_t * rdev)
1906 char b[BDEVNAME_SIZE];
1911 bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk);
1912 list_del_rcu(&rdev->same_set);
1913 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
1915 sysfs_remove_link(&rdev->kobj, "block");
1916 sysfs_put(rdev->sysfs_state);
1917 rdev->sysfs_state = NULL;
1918 /* We need to delay this, otherwise we can deadlock when
1919 * writing to 'remove' to "dev/state". We also need
1920 * to delay it due to rcu usage.
1923 INIT_WORK(&rdev->del_work, md_delayed_delete);
1924 kobject_get(&rdev->kobj);
1925 queue_work(md_misc_wq, &rdev->del_work);
1929 * prevent the device from being mounted, repartitioned or
1930 * otherwise reused by a RAID array (or any other kernel
1931 * subsystem), by bd_claiming the device.
1933 static int lock_rdev(mdk_rdev_t *rdev, dev_t dev, int shared)
1936 struct block_device *bdev;
1937 char b[BDEVNAME_SIZE];
1939 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
1941 printk(KERN_ERR "md: could not open %s.\n",
1942 __bdevname(dev, b));
1943 return PTR_ERR(bdev);
1945 err = bd_claim(bdev, shared ? (mdk_rdev_t *)lock_rdev : rdev);
1947 printk(KERN_ERR "md: could not bd_claim %s.\n",
1949 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
1953 set_bit(AllReserved, &rdev->flags);
1958 static void unlock_rdev(mdk_rdev_t *rdev)
1960 struct block_device *bdev = rdev->bdev;
1965 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
1968 void md_autodetect_dev(dev_t dev);
1970 static void export_rdev(mdk_rdev_t * rdev)
1972 char b[BDEVNAME_SIZE];
1973 printk(KERN_INFO "md: export_rdev(%s)\n",
1974 bdevname(rdev->bdev,b));
1979 if (test_bit(AutoDetected, &rdev->flags))
1980 md_autodetect_dev(rdev->bdev->bd_dev);
1983 kobject_put(&rdev->kobj);
1986 static void kick_rdev_from_array(mdk_rdev_t * rdev)
1988 unbind_rdev_from_array(rdev);
1992 static void export_array(mddev_t *mddev)
1994 mdk_rdev_t *rdev, *tmp;
1996 rdev_for_each(rdev, tmp, mddev) {
2001 kick_rdev_from_array(rdev);
2003 if (!list_empty(&mddev->disks))
2005 mddev->raid_disks = 0;
2006 mddev->major_version = 0;
2009 static void print_desc(mdp_disk_t *desc)
2011 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
2012 desc->major,desc->minor,desc->raid_disk,desc->state);
2015 static void print_sb_90(mdp_super_t *sb)
2020 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
2021 sb->major_version, sb->minor_version, sb->patch_version,
2022 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
2024 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
2025 sb->level, sb->size, sb->nr_disks, sb->raid_disks,
2026 sb->md_minor, sb->layout, sb->chunk_size);
2027 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
2028 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
2029 sb->utime, sb->state, sb->active_disks, sb->working_disks,
2030 sb->failed_disks, sb->spare_disks,
2031 sb->sb_csum, (unsigned long)sb->events_lo);
2034 for (i = 0; i < MD_SB_DISKS; i++) {
2037 desc = sb->disks + i;
2038 if (desc->number || desc->major || desc->minor ||
2039 desc->raid_disk || (desc->state && (desc->state != 4))) {
2040 printk(" D %2d: ", i);
2044 printk(KERN_INFO "md: THIS: ");
2045 print_desc(&sb->this_disk);
2048 static void print_sb_1(struct mdp_superblock_1 *sb)
2052 uuid = sb->set_uuid;
2054 "md: SB: (V:%u) (F:0x%08x) Array-ID:<%pU>\n"
2055 "md: Name: \"%s\" CT:%llu\n",
2056 le32_to_cpu(sb->major_version),
2057 le32_to_cpu(sb->feature_map),
2060 (unsigned long long)le64_to_cpu(sb->ctime)
2061 & MD_SUPERBLOCK_1_TIME_SEC_MASK);
2063 uuid = sb->device_uuid;
2065 "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu"
2067 "md: Dev:%08x UUID: %pU\n"
2068 "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n"
2069 "md: (MaxDev:%u) \n",
2070 le32_to_cpu(sb->level),
2071 (unsigned long long)le64_to_cpu(sb->size),
2072 le32_to_cpu(sb->raid_disks),
2073 le32_to_cpu(sb->layout),
2074 le32_to_cpu(sb->chunksize),
2075 (unsigned long long)le64_to_cpu(sb->data_offset),
2076 (unsigned long long)le64_to_cpu(sb->data_size),
2077 (unsigned long long)le64_to_cpu(sb->super_offset),
2078 (unsigned long long)le64_to_cpu(sb->recovery_offset),
2079 le32_to_cpu(sb->dev_number),
2082 (unsigned long long)le64_to_cpu(sb->utime) & MD_SUPERBLOCK_1_TIME_SEC_MASK,
2083 (unsigned long long)le64_to_cpu(sb->events),
2084 (unsigned long long)le64_to_cpu(sb->resync_offset),
2085 le32_to_cpu(sb->sb_csum),
2086 le32_to_cpu(sb->max_dev)
2090 static void print_rdev(mdk_rdev_t *rdev, int major_version)
2092 char b[BDEVNAME_SIZE];
2093 printk(KERN_INFO "md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n",
2094 bdevname(rdev->bdev, b), (unsigned long long)rdev->sectors,
2095 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
2097 if (rdev->sb_loaded) {
2098 printk(KERN_INFO "md: rdev superblock (MJ:%d):\n", major_version);
2099 switch (major_version) {
2101 print_sb_90((mdp_super_t*)page_address(rdev->sb_page));
2104 print_sb_1((struct mdp_superblock_1 *)page_address(rdev->sb_page));
2108 printk(KERN_INFO "md: no rdev superblock!\n");
2111 static void md_print_devices(void)
2113 struct list_head *tmp;
2116 char b[BDEVNAME_SIZE];
2119 printk("md: **********************************\n");
2120 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
2121 printk("md: **********************************\n");
2122 for_each_mddev(mddev, tmp) {
2125 bitmap_print_sb(mddev->bitmap);
2127 printk("%s: ", mdname(mddev));
2128 list_for_each_entry(rdev, &mddev->disks, same_set)
2129 printk("<%s>", bdevname(rdev->bdev,b));
2132 list_for_each_entry(rdev, &mddev->disks, same_set)
2133 print_rdev(rdev, mddev->major_version);
2135 printk("md: **********************************\n");
2140 static void sync_sbs(mddev_t * mddev, int nospares)
2142 /* Update each superblock (in-memory image), but
2143 * if we are allowed to, skip spares which already
2144 * have the right event counter, or have one earlier
2145 * (which would mean they aren't being marked as dirty
2146 * with the rest of the array)
2149 list_for_each_entry(rdev, &mddev->disks, same_set) {
2150 if (rdev->sb_events == mddev->events ||
2152 rdev->raid_disk < 0 &&
2153 rdev->sb_events+1 == mddev->events)) {
2154 /* Don't update this superblock */
2155 rdev->sb_loaded = 2;
2157 super_types[mddev->major_version].
2158 sync_super(mddev, rdev);
2159 rdev->sb_loaded = 1;
2164 static void md_update_sb(mddev_t * mddev, int force_change)
2171 /* First make sure individual recovery_offsets are correct */
2172 list_for_each_entry(rdev, &mddev->disks, same_set) {
2173 if (rdev->raid_disk >= 0 &&
2174 mddev->delta_disks >= 0 &&
2175 !test_bit(In_sync, &rdev->flags) &&
2176 mddev->curr_resync_completed > rdev->recovery_offset)
2177 rdev->recovery_offset = mddev->curr_resync_completed;
2180 if (!mddev->persistent) {
2181 clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
2182 clear_bit(MD_CHANGE_DEVS, &mddev->flags);
2183 if (!mddev->external)
2184 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2185 wake_up(&mddev->sb_wait);
2189 spin_lock_irq(&mddev->write_lock);
2191 mddev->utime = get_seconds();
2193 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
2195 if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags))
2196 /* just a clean<-> dirty transition, possibly leave spares alone,
2197 * though if events isn't the right even/odd, we will have to do
2203 if (mddev->degraded)
2204 /* If the array is degraded, then skipping spares is both
2205 * dangerous and fairly pointless.
2206 * Dangerous because a device that was removed from the array
2207 * might have a event_count that still looks up-to-date,
2208 * so it can be re-added without a resync.
2209 * Pointless because if there are any spares to skip,
2210 * then a recovery will happen and soon that array won't
2211 * be degraded any more and the spare can go back to sleep then.
2215 sync_req = mddev->in_sync;
2217 /* If this is just a dirty<->clean transition, and the array is clean
2218 * and 'events' is odd, we can roll back to the previous clean state */
2220 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
2221 && mddev->can_decrease_events
2222 && mddev->events != 1) {
2224 mddev->can_decrease_events = 0;
2226 /* otherwise we have to go forward and ... */
2228 mddev->can_decrease_events = nospares;
2231 if (!mddev->events) {
2233 * oops, this 64-bit counter should never wrap.
2234 * Either we are in around ~1 trillion A.C., assuming
2235 * 1 reboot per second, or we have a bug:
2240 sync_sbs(mddev, nospares);
2241 spin_unlock_irq(&mddev->write_lock);
2244 "md: updating %s RAID superblock on device (in sync %d)\n",
2245 mdname(mddev),mddev->in_sync);
2247 bitmap_update_sb(mddev->bitmap);
2248 list_for_each_entry(rdev, &mddev->disks, same_set) {
2249 char b[BDEVNAME_SIZE];
2250 dprintk(KERN_INFO "md: ");
2251 if (rdev->sb_loaded != 1)
2252 continue; /* no noise on spare devices */
2253 if (test_bit(Faulty, &rdev->flags))
2254 dprintk("(skipping faulty ");
2256 dprintk("%s ", bdevname(rdev->bdev,b));
2257 if (!test_bit(Faulty, &rdev->flags)) {
2258 md_super_write(mddev,rdev,
2259 rdev->sb_start, rdev->sb_size,
2261 dprintk(KERN_INFO "(write) %s's sb offset: %llu\n",
2262 bdevname(rdev->bdev,b),
2263 (unsigned long long)rdev->sb_start);
2264 rdev->sb_events = mddev->events;
2268 if (mddev->level == LEVEL_MULTIPATH)
2269 /* only need to write one superblock... */
2272 md_super_wait(mddev);
2273 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2275 spin_lock_irq(&mddev->write_lock);
2276 if (mddev->in_sync != sync_req ||
2277 test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
2278 /* have to write it out again */
2279 spin_unlock_irq(&mddev->write_lock);
2282 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2283 spin_unlock_irq(&mddev->write_lock);
2284 wake_up(&mddev->sb_wait);
2285 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
2286 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
2290 /* words written to sysfs files may, or may not, be \n terminated.
2291 * We want to accept with case. For this we use cmd_match.
2293 static int cmd_match(const char *cmd, const char *str)
2295 /* See if cmd, written into a sysfs file, matches
2296 * str. They must either be the same, or cmd can
2297 * have a trailing newline
2299 while (*cmd && *str && *cmd == *str) {
2310 struct rdev_sysfs_entry {
2311 struct attribute attr;
2312 ssize_t (*show)(mdk_rdev_t *, char *);
2313 ssize_t (*store)(mdk_rdev_t *, const char *, size_t);
2317 state_show(mdk_rdev_t *rdev, char *page)
2322 if (test_bit(Faulty, &rdev->flags)) {
2323 len+= sprintf(page+len, "%sfaulty",sep);
2326 if (test_bit(In_sync, &rdev->flags)) {
2327 len += sprintf(page+len, "%sin_sync",sep);
2330 if (test_bit(WriteMostly, &rdev->flags)) {
2331 len += sprintf(page+len, "%swrite_mostly",sep);
2334 if (test_bit(Blocked, &rdev->flags)) {
2335 len += sprintf(page+len, "%sblocked", sep);
2338 if (!test_bit(Faulty, &rdev->flags) &&
2339 !test_bit(In_sync, &rdev->flags)) {
2340 len += sprintf(page+len, "%sspare", sep);
2343 return len+sprintf(page+len, "\n");
2347 state_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2350 * faulty - simulates and error
2351 * remove - disconnects the device
2352 * writemostly - sets write_mostly
2353 * -writemostly - clears write_mostly
2354 * blocked - sets the Blocked flag
2355 * -blocked - clears the Blocked flag
2356 * insync - sets Insync providing device isn't active
2359 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
2360 md_error(rdev->mddev, rdev);
2362 } else if (cmd_match(buf, "remove")) {
2363 if (rdev->raid_disk >= 0)
2366 mddev_t *mddev = rdev->mddev;
2367 kick_rdev_from_array(rdev);
2369 md_update_sb(mddev, 1);
2370 md_new_event(mddev);
2373 } else if (cmd_match(buf, "writemostly")) {
2374 set_bit(WriteMostly, &rdev->flags);
2376 } else if (cmd_match(buf, "-writemostly")) {
2377 clear_bit(WriteMostly, &rdev->flags);
2379 } else if (cmd_match(buf, "blocked")) {
2380 set_bit(Blocked, &rdev->flags);
2382 } else if (cmd_match(buf, "-blocked")) {
2383 clear_bit(Blocked, &rdev->flags);
2384 wake_up(&rdev->blocked_wait);
2385 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2386 md_wakeup_thread(rdev->mddev->thread);
2389 } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) {
2390 set_bit(In_sync, &rdev->flags);
2394 sysfs_notify_dirent_safe(rdev->sysfs_state);
2395 return err ? err : len;
2397 static struct rdev_sysfs_entry rdev_state =
2398 __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store);
2401 errors_show(mdk_rdev_t *rdev, char *page)
2403 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
2407 errors_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2410 unsigned long n = simple_strtoul(buf, &e, 10);
2411 if (*buf && (*e == 0 || *e == '\n')) {
2412 atomic_set(&rdev->corrected_errors, n);
2417 static struct rdev_sysfs_entry rdev_errors =
2418 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
2421 slot_show(mdk_rdev_t *rdev, char *page)
2423 if (rdev->raid_disk < 0)
2424 return sprintf(page, "none\n");
2426 return sprintf(page, "%d\n", rdev->raid_disk);
2430 slot_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2435 int slot = simple_strtoul(buf, &e, 10);
2436 if (strncmp(buf, "none", 4)==0)
2438 else if (e==buf || (*e && *e!= '\n'))
2440 if (rdev->mddev->pers && slot == -1) {
2441 /* Setting 'slot' on an active array requires also
2442 * updating the 'rd%d' link, and communicating
2443 * with the personality with ->hot_*_disk.
2444 * For now we only support removing
2445 * failed/spare devices. This normally happens automatically,
2446 * but not when the metadata is externally managed.
2448 if (rdev->raid_disk == -1)
2450 /* personality does all needed checks */
2451 if (rdev->mddev->pers->hot_add_disk == NULL)
2453 err = rdev->mddev->pers->
2454 hot_remove_disk(rdev->mddev, rdev->raid_disk);
2457 sprintf(nm, "rd%d", rdev->raid_disk);
2458 sysfs_remove_link(&rdev->mddev->kobj, nm);
2459 rdev->raid_disk = -1;
2460 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2461 md_wakeup_thread(rdev->mddev->thread);
2462 } else if (rdev->mddev->pers) {
2464 /* Activating a spare .. or possibly reactivating
2465 * if we ever get bitmaps working here.
2468 if (rdev->raid_disk != -1)
2471 if (rdev->mddev->pers->hot_add_disk == NULL)
2474 list_for_each_entry(rdev2, &rdev->mddev->disks, same_set)
2475 if (rdev2->raid_disk == slot)
2478 rdev->raid_disk = slot;
2479 if (test_bit(In_sync, &rdev->flags))
2480 rdev->saved_raid_disk = slot;
2482 rdev->saved_raid_disk = -1;
2483 err = rdev->mddev->pers->
2484 hot_add_disk(rdev->mddev, rdev);
2486 rdev->raid_disk = -1;
2489 sysfs_notify_dirent_safe(rdev->sysfs_state);
2490 sprintf(nm, "rd%d", rdev->raid_disk);
2491 if (sysfs_create_link(&rdev->mddev->kobj, &rdev->kobj, nm))
2492 /* failure here is OK */;
2493 /* don't wakeup anyone, leave that to userspace. */
2495 if (slot >= rdev->mddev->raid_disks)
2497 rdev->raid_disk = slot;
2498 /* assume it is working */
2499 clear_bit(Faulty, &rdev->flags);
2500 clear_bit(WriteMostly, &rdev->flags);
2501 set_bit(In_sync, &rdev->flags);
2502 sysfs_notify_dirent_safe(rdev->sysfs_state);
2508 static struct rdev_sysfs_entry rdev_slot =
2509 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
2512 offset_show(mdk_rdev_t *rdev, char *page)
2514 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
2518 offset_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2521 unsigned long long offset = simple_strtoull(buf, &e, 10);
2522 if (e==buf || (*e && *e != '\n'))
2524 if (rdev->mddev->pers && rdev->raid_disk >= 0)
2526 if (rdev->sectors && rdev->mddev->external)
2527 /* Must set offset before size, so overlap checks
2530 rdev->data_offset = offset;
2534 static struct rdev_sysfs_entry rdev_offset =
2535 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
2538 rdev_size_show(mdk_rdev_t *rdev, char *page)
2540 return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2);
2543 static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
2545 /* check if two start/length pairs overlap */
2553 static int strict_blocks_to_sectors(const char *buf, sector_t *sectors)
2555 unsigned long long blocks;
2558 if (strict_strtoull(buf, 10, &blocks) < 0)
2561 if (blocks & 1ULL << (8 * sizeof(blocks) - 1))
2562 return -EINVAL; /* sector conversion overflow */
2565 if (new != blocks * 2)
2566 return -EINVAL; /* unsigned long long to sector_t overflow */
2573 rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2575 mddev_t *my_mddev = rdev->mddev;
2576 sector_t oldsectors = rdev->sectors;
2579 if (strict_blocks_to_sectors(buf, §ors) < 0)
2581 if (my_mddev->pers && rdev->raid_disk >= 0) {
2582 if (my_mddev->persistent) {
2583 sectors = super_types[my_mddev->major_version].
2584 rdev_size_change(rdev, sectors);
2587 } else if (!sectors)
2588 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) -
2591 if (sectors < my_mddev->dev_sectors)
2592 return -EINVAL; /* component must fit device */
2594 rdev->sectors = sectors;
2595 if (sectors > oldsectors && my_mddev->external) {
2596 /* need to check that all other rdevs with the same ->bdev
2597 * do not overlap. We need to unlock the mddev to avoid
2598 * a deadlock. We have already changed rdev->sectors, and if
2599 * we have to change it back, we will have the lock again.
2603 struct list_head *tmp;
2605 mddev_unlock(my_mddev);
2606 for_each_mddev(mddev, tmp) {
2610 list_for_each_entry(rdev2, &mddev->disks, same_set)
2611 if (test_bit(AllReserved, &rdev2->flags) ||
2612 (rdev->bdev == rdev2->bdev &&
2614 overlaps(rdev->data_offset, rdev->sectors,
2620 mddev_unlock(mddev);
2626 mddev_lock(my_mddev);
2628 /* Someone else could have slipped in a size
2629 * change here, but doing so is just silly.
2630 * We put oldsectors back because we *know* it is
2631 * safe, and trust userspace not to race with
2634 rdev->sectors = oldsectors;
2641 static struct rdev_sysfs_entry rdev_size =
2642 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
2645 static ssize_t recovery_start_show(mdk_rdev_t *rdev, char *page)
2647 unsigned long long recovery_start = rdev->recovery_offset;
2649 if (test_bit(In_sync, &rdev->flags) ||
2650 recovery_start == MaxSector)
2651 return sprintf(page, "none\n");
2653 return sprintf(page, "%llu\n", recovery_start);
2656 static ssize_t recovery_start_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2658 unsigned long long recovery_start;
2660 if (cmd_match(buf, "none"))
2661 recovery_start = MaxSector;
2662 else if (strict_strtoull(buf, 10, &recovery_start))
2665 if (rdev->mddev->pers &&
2666 rdev->raid_disk >= 0)
2669 rdev->recovery_offset = recovery_start;
2670 if (recovery_start == MaxSector)
2671 set_bit(In_sync, &rdev->flags);
2673 clear_bit(In_sync, &rdev->flags);
2677 static struct rdev_sysfs_entry rdev_recovery_start =
2678 __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store);
2680 static struct attribute *rdev_default_attrs[] = {
2686 &rdev_recovery_start.attr,
2690 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
2692 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2693 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
2694 mddev_t *mddev = rdev->mddev;
2700 rv = mddev ? mddev_lock(mddev) : -EBUSY;
2702 if (rdev->mddev == NULL)
2705 rv = entry->show(rdev, page);
2706 mddev_unlock(mddev);
2712 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
2713 const char *page, size_t length)
2715 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2716 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
2718 mddev_t *mddev = rdev->mddev;
2722 if (!capable(CAP_SYS_ADMIN))
2724 rv = mddev ? mddev_lock(mddev): -EBUSY;
2726 if (rdev->mddev == NULL)
2729 rv = entry->store(rdev, page, length);
2730 mddev_unlock(mddev);
2735 static void rdev_free(struct kobject *ko)
2737 mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj);
2740 static const struct sysfs_ops rdev_sysfs_ops = {
2741 .show = rdev_attr_show,
2742 .store = rdev_attr_store,
2744 static struct kobj_type rdev_ktype = {
2745 .release = rdev_free,
2746 .sysfs_ops = &rdev_sysfs_ops,
2747 .default_attrs = rdev_default_attrs,
2750 void md_rdev_init(mdk_rdev_t *rdev)
2753 rdev->saved_raid_disk = -1;
2754 rdev->raid_disk = -1;
2756 rdev->data_offset = 0;
2757 rdev->sb_events = 0;
2758 rdev->last_read_error.tv_sec = 0;
2759 rdev->last_read_error.tv_nsec = 0;
2760 atomic_set(&rdev->nr_pending, 0);
2761 atomic_set(&rdev->read_errors, 0);
2762 atomic_set(&rdev->corrected_errors, 0);
2764 INIT_LIST_HEAD(&rdev->same_set);
2765 init_waitqueue_head(&rdev->blocked_wait);
2767 EXPORT_SYMBOL_GPL(md_rdev_init);
2769 * Import a device. If 'super_format' >= 0, then sanity check the superblock
2771 * mark the device faulty if:
2773 * - the device is nonexistent (zero size)
2774 * - the device has no valid superblock
2776 * a faulty rdev _never_ has rdev->sb set.
2778 static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor)
2780 char b[BDEVNAME_SIZE];
2785 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
2787 printk(KERN_ERR "md: could not alloc mem for new device!\n");
2788 return ERR_PTR(-ENOMEM);
2792 if ((err = alloc_disk_sb(rdev)))
2795 err = lock_rdev(rdev, newdev, super_format == -2);
2799 kobject_init(&rdev->kobj, &rdev_ktype);
2801 size = i_size_read(rdev->bdev->bd_inode) >> BLOCK_SIZE_BITS;
2804 "md: %s has zero or unknown size, marking faulty!\n",
2805 bdevname(rdev->bdev,b));
2810 if (super_format >= 0) {
2811 err = super_types[super_format].
2812 load_super(rdev, NULL, super_minor);
2813 if (err == -EINVAL) {
2815 "md: %s does not have a valid v%d.%d "
2816 "superblock, not importing!\n",
2817 bdevname(rdev->bdev,b),
2818 super_format, super_minor);
2823 "md: could not read %s's sb, not importing!\n",
2824 bdevname(rdev->bdev,b));
2832 if (rdev->sb_page) {
2838 return ERR_PTR(err);
2842 * Check a full RAID array for plausibility
2846 static void analyze_sbs(mddev_t * mddev)
2849 mdk_rdev_t *rdev, *freshest, *tmp;
2850 char b[BDEVNAME_SIZE];
2853 rdev_for_each(rdev, tmp, mddev)
2854 switch (super_types[mddev->major_version].
2855 load_super(rdev, freshest, mddev->minor_version)) {
2863 "md: fatal superblock inconsistency in %s"
2864 " -- removing from array\n",
2865 bdevname(rdev->bdev,b));
2866 kick_rdev_from_array(rdev);
2870 super_types[mddev->major_version].
2871 validate_super(mddev, freshest);
2874 rdev_for_each(rdev, tmp, mddev) {
2875 if (mddev->max_disks &&
2876 (rdev->desc_nr >= mddev->max_disks ||
2877 i > mddev->max_disks)) {
2879 "md: %s: %s: only %d devices permitted\n",
2880 mdname(mddev), bdevname(rdev->bdev, b),
2882 kick_rdev_from_array(rdev);
2885 if (rdev != freshest)
2886 if (super_types[mddev->major_version].
2887 validate_super(mddev, rdev)) {
2888 printk(KERN_WARNING "md: kicking non-fresh %s"
2890 bdevname(rdev->bdev,b));
2891 kick_rdev_from_array(rdev);
2894 if (mddev->level == LEVEL_MULTIPATH) {
2895 rdev->desc_nr = i++;
2896 rdev->raid_disk = rdev->desc_nr;
2897 set_bit(In_sync, &rdev->flags);
2898 } else if (rdev->raid_disk >= (mddev->raid_disks - min(0, mddev->delta_disks))) {
2899 rdev->raid_disk = -1;
2900 clear_bit(In_sync, &rdev->flags);
2905 /* Read a fixed-point number.
2906 * Numbers in sysfs attributes should be in "standard" units where
2907 * possible, so time should be in seconds.
2908 * However we internally use a a much smaller unit such as
2909 * milliseconds or jiffies.
2910 * This function takes a decimal number with a possible fractional
2911 * component, and produces an integer which is the result of
2912 * multiplying that number by 10^'scale'.
2913 * all without any floating-point arithmetic.
2915 int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale)
2917 unsigned long result = 0;
2919 while (isdigit(*cp) || (*cp == '.' && decimals < 0)) {
2922 else if (decimals < scale) {
2925 result = result * 10 + value;
2937 while (decimals < scale) {
2946 static void md_safemode_timeout(unsigned long data);
2949 safe_delay_show(mddev_t *mddev, char *page)
2951 int msec = (mddev->safemode_delay*1000)/HZ;
2952 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
2955 safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len)
2959 if (strict_strtoul_scaled(cbuf, &msec, 3) < 0)
2962 mddev->safemode_delay = 0;
2964 unsigned long old_delay = mddev->safemode_delay;
2965 mddev->safemode_delay = (msec*HZ)/1000;
2966 if (mddev->safemode_delay == 0)
2967 mddev->safemode_delay = 1;
2968 if (mddev->safemode_delay < old_delay)
2969 md_safemode_timeout((unsigned long)mddev);
2973 static struct md_sysfs_entry md_safe_delay =
2974 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
2977 level_show(mddev_t *mddev, char *page)
2979 struct mdk_personality *p = mddev->pers;
2981 return sprintf(page, "%s\n", p->name);
2982 else if (mddev->clevel[0])
2983 return sprintf(page, "%s\n", mddev->clevel);
2984 else if (mddev->level != LEVEL_NONE)
2985 return sprintf(page, "%d\n", mddev->level);
2991 level_store(mddev_t *mddev, const char *buf, size_t len)
2995 struct mdk_personality *pers;
3000 if (mddev->pers == NULL) {
3003 if (len >= sizeof(mddev->clevel))
3005 strncpy(mddev->clevel, buf, len);
3006 if (mddev->clevel[len-1] == '\n')
3008 mddev->clevel[len] = 0;
3009 mddev->level = LEVEL_NONE;
3013 /* request to change the personality. Need to ensure:
3014 * - array is not engaged in resync/recovery/reshape
3015 * - old personality can be suspended
3016 * - new personality will access other array.
3019 if (mddev->sync_thread ||
3020 mddev->reshape_position != MaxSector ||
3021 mddev->sysfs_active)
3024 if (!mddev->pers->quiesce) {
3025 printk(KERN_WARNING "md: %s: %s does not support online personality change\n",
3026 mdname(mddev), mddev->pers->name);
3030 /* Now find the new personality */
3031 if (len == 0 || len >= sizeof(clevel))
3033 strncpy(clevel, buf, len);
3034 if (clevel[len-1] == '\n')
3037 if (strict_strtol(clevel, 10, &level))
3040 if (request_module("md-%s", clevel) != 0)
3041 request_module("md-level-%s", clevel);
3042 spin_lock(&pers_lock);
3043 pers = find_pers(level, clevel);
3044 if (!pers || !try_module_get(pers->owner)) {
3045 spin_unlock(&pers_lock);
3046 printk(KERN_WARNING "md: personality %s not loaded\n", clevel);
3049 spin_unlock(&pers_lock);
3051 if (pers == mddev->pers) {
3052 /* Nothing to do! */
3053 module_put(pers->owner);
3056 if (!pers->takeover) {
3057 module_put(pers->owner);
3058 printk(KERN_WARNING "md: %s: %s does not support personality takeover\n",
3059 mdname(mddev), clevel);
3063 list_for_each_entry(rdev, &mddev->disks, same_set)
3064 rdev->new_raid_disk = rdev->raid_disk;
3066 /* ->takeover must set new_* and/or delta_disks
3067 * if it succeeds, and may set them when it fails.
3069 priv = pers->takeover(mddev);
3071 mddev->new_level = mddev->level;
3072 mddev->new_layout = mddev->layout;
3073 mddev->new_chunk_sectors = mddev->chunk_sectors;
3074 mddev->raid_disks -= mddev->delta_disks;
3075 mddev->delta_disks = 0;
3076 module_put(pers->owner);
3077 printk(KERN_WARNING "md: %s: %s would not accept array\n",
3078 mdname(mddev), clevel);
3079 return PTR_ERR(priv);
3082 /* Looks like we have a winner */
3083 mddev_suspend(mddev);
3084 mddev->pers->stop(mddev);
3086 if (mddev->pers->sync_request == NULL &&
3087 pers->sync_request != NULL) {
3088 /* need to add the md_redundancy_group */
3089 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
3091 "md: cannot register extra attributes for %s\n",
3093 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, NULL, "sync_action");
3095 if (mddev->pers->sync_request != NULL &&
3096 pers->sync_request == NULL) {
3097 /* need to remove the md_redundancy_group */
3098 if (mddev->to_remove == NULL)
3099 mddev->to_remove = &md_redundancy_group;
3102 if (mddev->pers->sync_request == NULL &&
3104 /* We are converting from a no-redundancy array
3105 * to a redundancy array and metadata is managed
3106 * externally so we need to be sure that writes
3107 * won't block due to a need to transition
3109 * until external management is started.
3112 mddev->safemode_delay = 0;
3113 mddev->safemode = 0;
3116 list_for_each_entry(rdev, &mddev->disks, same_set) {
3118 if (rdev->raid_disk < 0)
3120 if (rdev->new_raid_disk > mddev->raid_disks)
3121 rdev->new_raid_disk = -1;
3122 if (rdev->new_raid_disk == rdev->raid_disk)
3124 sprintf(nm, "rd%d", rdev->raid_disk);
3125 sysfs_remove_link(&mddev->kobj, nm);
3127 list_for_each_entry(rdev, &mddev->disks, same_set) {
3128 if (rdev->raid_disk < 0)
3130 if (rdev->new_raid_disk == rdev->raid_disk)
3132 rdev->raid_disk = rdev->new_raid_disk;
3133 if (rdev->raid_disk < 0)
3134 clear_bit(In_sync, &rdev->flags);
3137 sprintf(nm, "rd%d", rdev->raid_disk);
3138 if(sysfs_create_link(&mddev->kobj, &rdev->kobj, nm))
3139 printk("md: cannot register %s for %s after level change\n",
3144 module_put(mddev->pers->owner);
3146 mddev->private = priv;
3147 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
3148 mddev->level = mddev->new_level;
3149 mddev->layout = mddev->new_layout;
3150 mddev->chunk_sectors = mddev->new_chunk_sectors;
3151 mddev->delta_disks = 0;
3152 if (mddev->pers->sync_request == NULL) {
3153 /* this is now an array without redundancy, so
3154 * it must always be in_sync
3157 del_timer_sync(&mddev->safemode_timer);
3160 mddev_resume(mddev);
3161 set_bit(MD_CHANGE_DEVS, &mddev->flags);
3162 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3163 md_wakeup_thread(mddev->thread);
3164 sysfs_notify(&mddev->kobj, NULL, "level");
3165 md_new_event(mddev);
3169 static struct md_sysfs_entry md_level =
3170 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
3174 layout_show(mddev_t *mddev, char *page)
3176 /* just a number, not meaningful for all levels */
3177 if (mddev->reshape_position != MaxSector &&
3178 mddev->layout != mddev->new_layout)
3179 return sprintf(page, "%d (%d)\n",
3180 mddev->new_layout, mddev->layout);
3181 return sprintf(page, "%d\n", mddev->layout);
3185 layout_store(mddev_t *mddev, const char *buf, size_t len)
3188 unsigned long n = simple_strtoul(buf, &e, 10);
3190 if (!*buf || (*e && *e != '\n'))
3195 if (mddev->pers->check_reshape == NULL)
3197 mddev->new_layout = n;
3198 err = mddev->pers->check_reshape(mddev);
3200 mddev->new_layout = mddev->layout;
3204 mddev->new_layout = n;
3205 if (mddev->reshape_position == MaxSector)
3210 static struct md_sysfs_entry md_layout =
3211 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
3215 raid_disks_show(mddev_t *mddev, char *page)
3217 if (mddev->raid_disks == 0)
3219 if (mddev->reshape_position != MaxSector &&
3220 mddev->delta_disks != 0)
3221 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
3222 mddev->raid_disks - mddev->delta_disks);
3223 return sprintf(page, "%d\n", mddev->raid_disks);
3226 static int update_raid_disks(mddev_t *mddev, int raid_disks);
3229 raid_disks_store(mddev_t *mddev, const char *buf, size_t len)
3233 unsigned long n = simple_strtoul(buf, &e, 10);
3235 if (!*buf || (*e && *e != '\n'))
3239 rv = update_raid_disks(mddev, n);
3240 else if (mddev->reshape_position != MaxSector) {
3241 int olddisks = mddev->raid_disks - mddev->delta_disks;
3242 mddev->delta_disks = n - olddisks;
3243 mddev->raid_disks = n;
3245 mddev->raid_disks = n;
3246 return rv ? rv : len;
3248 static struct md_sysfs_entry md_raid_disks =
3249 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
3252 chunk_size_show(mddev_t *mddev, char *page)
3254 if (mddev->reshape_position != MaxSector &&
3255 mddev->chunk_sectors != mddev->new_chunk_sectors)
3256 return sprintf(page, "%d (%d)\n",
3257 mddev->new_chunk_sectors << 9,
3258 mddev->chunk_sectors << 9);
3259 return sprintf(page, "%d\n", mddev->chunk_sectors << 9);
3263 chunk_size_store(mddev_t *mddev, const char *buf, size_t len)
3266 unsigned long n = simple_strtoul(buf, &e, 10);
3268 if (!*buf || (*e && *e != '\n'))
3273 if (mddev->pers->check_reshape == NULL)
3275 mddev->new_chunk_sectors = n >> 9;
3276 err = mddev->pers->check_reshape(mddev);
3278 mddev->new_chunk_sectors = mddev->chunk_sectors;
3282 mddev->new_chunk_sectors = n >> 9;
3283 if (mddev->reshape_position == MaxSector)
3284 mddev->chunk_sectors = n >> 9;
3288 static struct md_sysfs_entry md_chunk_size =
3289 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
3292 resync_start_show(mddev_t *mddev, char *page)
3294 if (mddev->recovery_cp == MaxSector)
3295 return sprintf(page, "none\n");
3296 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
3300 resync_start_store(mddev_t *mddev, const char *buf, size_t len)
3303 unsigned long long n = simple_strtoull(buf, &e, 10);
3307 if (cmd_match(buf, "none"))
3309 else if (!*buf || (*e && *e != '\n'))
3312 mddev->recovery_cp = n;
3315 static struct md_sysfs_entry md_resync_start =
3316 __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store);
3319 * The array state can be:
3322 * No devices, no size, no level
3323 * Equivalent to STOP_ARRAY ioctl
3325 * May have some settings, but array is not active
3326 * all IO results in error
3327 * When written, doesn't tear down array, but just stops it
3328 * suspended (not supported yet)
3329 * All IO requests will block. The array can be reconfigured.
3330 * Writing this, if accepted, will block until array is quiescent
3332 * no resync can happen. no superblocks get written.
3333 * write requests fail
3335 * like readonly, but behaves like 'clean' on a write request.
3337 * clean - no pending writes, but otherwise active.
3338 * When written to inactive array, starts without resync
3339 * If a write request arrives then
3340 * if metadata is known, mark 'dirty' and switch to 'active'.
3341 * if not known, block and switch to write-pending
3342 * If written to an active array that has pending writes, then fails.
3344 * fully active: IO and resync can be happening.
3345 * When written to inactive array, starts with resync
3348 * clean, but writes are blocked waiting for 'active' to be written.
3351 * like active, but no writes have been seen for a while (100msec).
3354 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
3355 write_pending, active_idle, bad_word};
3356 static char *array_states[] = {
3357 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3358 "write-pending", "active-idle", NULL };
3360 static int match_word(const char *word, char **list)
3363 for (n=0; list[n]; n++)
3364 if (cmd_match(word, list[n]))
3370 array_state_show(mddev_t *mddev, char *page)
3372 enum array_state st = inactive;
3385 else if (test_bit(MD_CHANGE_PENDING, &mddev->flags))
3387 else if (mddev->safemode)
3393 if (list_empty(&mddev->disks) &&
3394 mddev->raid_disks == 0 &&
3395 mddev->dev_sectors == 0)
3400 return sprintf(page, "%s\n", array_states[st]);
3403 static int do_md_stop(mddev_t * mddev, int ro, int is_open);
3404 static int md_set_readonly(mddev_t * mddev, int is_open);
3405 static int do_md_run(mddev_t * mddev);
3406 static int restart_array(mddev_t *mddev);
3409 array_state_store(mddev_t *mddev, const char *buf, size_t len)
3412 enum array_state st = match_word(buf, array_states);
3417 /* stopping an active array */
3418 if (atomic_read(&mddev->openers) > 0)
3420 err = do_md_stop(mddev, 0, 0);
3423 /* stopping an active array */
3425 if (atomic_read(&mddev->openers) > 0)
3427 err = do_md_stop(mddev, 2, 0);
3429 err = 0; /* already inactive */
3432 break; /* not supported yet */
3435 err = md_set_readonly(mddev, 0);
3438 set_disk_ro(mddev->gendisk, 1);
3439 err = do_md_run(mddev);
3445 err = md_set_readonly(mddev, 0);
3446 else if (mddev->ro == 1)
3447 err = restart_array(mddev);
3450 set_disk_ro(mddev->gendisk, 0);
3454 err = do_md_run(mddev);
3459 restart_array(mddev);
3460 spin_lock_irq(&mddev->write_lock);
3461 if (atomic_read(&mddev->writes_pending) == 0) {
3462 if (mddev->in_sync == 0) {
3464 if (mddev->safemode == 1)
3465 mddev->safemode = 0;
3466 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
3471 spin_unlock_irq(&mddev->write_lock);
3477 restart_array(mddev);
3478 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
3479 wake_up(&mddev->sb_wait);
3483 set_disk_ro(mddev->gendisk, 0);
3484 err = do_md_run(mddev);
3489 /* these cannot be set */
3495 sysfs_notify_dirent_safe(mddev->sysfs_state);
3499 static struct md_sysfs_entry md_array_state =
3500 __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
3503 max_corrected_read_errors_show(mddev_t *mddev, char *page) {
3504 return sprintf(page, "%d\n",
3505 atomic_read(&mddev->max_corr_read_errors));
3509 max_corrected_read_errors_store(mddev_t *mddev, const char *buf, size_t len)
3512 unsigned long n = simple_strtoul(buf, &e, 10);
3514 if (*buf && (*e == 0 || *e == '\n')) {
3515 atomic_set(&mddev->max_corr_read_errors, n);
3521 static struct md_sysfs_entry max_corr_read_errors =
3522 __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show,
3523 max_corrected_read_errors_store);
3526 null_show(mddev_t *mddev, char *page)
3532 new_dev_store(mddev_t *mddev, const char *buf, size_t len)
3534 /* buf must be %d:%d\n? giving major and minor numbers */
3535 /* The new device is added to the array.
3536 * If the array has a persistent superblock, we read the
3537 * superblock to initialise info and check validity.
3538 * Otherwise, only checking done is that in bind_rdev_to_array,
3539 * which mainly checks size.
3542 int major = simple_strtoul(buf, &e, 10);
3548 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
3550 minor = simple_strtoul(e+1, &e, 10);
3551 if (*e && *e != '\n')
3553 dev = MKDEV(major, minor);
3554 if (major != MAJOR(dev) ||
3555 minor != MINOR(dev))
3559 if (mddev->persistent) {
3560 rdev = md_import_device(dev, mddev->major_version,
3561 mddev->minor_version);
3562 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
3563 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
3564 mdk_rdev_t, same_set);
3565 err = super_types[mddev->major_version]
3566 .load_super(rdev, rdev0, mddev->minor_version);
3570 } else if (mddev->external)
3571 rdev = md_import_device(dev, -2, -1);
3573 rdev = md_import_device(dev, -1, -1);
3576 return PTR_ERR(rdev);
3577 err = bind_rdev_to_array(rdev, mddev);
3581 return err ? err : len;
3584 static struct md_sysfs_entry md_new_device =
3585 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
3588 bitmap_store(mddev_t *mddev, const char *buf, size_t len)
3591 unsigned long chunk, end_chunk;
3595 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
3597 chunk = end_chunk = simple_strtoul(buf, &end, 0);
3598 if (buf == end) break;
3599 if (*end == '-') { /* range */
3601 end_chunk = simple_strtoul(buf, &end, 0);
3602 if (buf == end) break;
3604 if (*end && !isspace(*end)) break;
3605 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
3606 buf = skip_spaces(end);
3608 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
3613 static struct md_sysfs_entry md_bitmap =
3614 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
3617 size_show(mddev_t *mddev, char *page)
3619 return sprintf(page, "%llu\n",
3620 (unsigned long long)mddev->dev_sectors / 2);
3623 static int update_size(mddev_t *mddev, sector_t num_sectors);
3626 size_store(mddev_t *mddev, const char *buf, size_t len)
3628 /* If array is inactive, we can reduce the component size, but
3629 * not increase it (except from 0).
3630 * If array is active, we can try an on-line resize
3633 int err = strict_blocks_to_sectors(buf, §ors);
3638 err = update_size(mddev, sectors);
3639 md_update_sb(mddev, 1);
3641 if (mddev->dev_sectors == 0 ||
3642 mddev->dev_sectors > sectors)
3643 mddev->dev_sectors = sectors;
3647 return err ? err : len;
3650 static struct md_sysfs_entry md_size =
3651 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
3656 * 'none' for arrays with no metadata (good luck...)
3657 * 'external' for arrays with externally managed metadata,
3658 * or N.M for internally known formats
3661 metadata_show(mddev_t *mddev, char *page)
3663 if (mddev->persistent)
3664 return sprintf(page, "%d.%d\n",
3665 mddev->major_version, mddev->minor_version);
3666 else if (mddev->external)
3667 return sprintf(page, "external:%s\n", mddev->metadata_type);
3669 return sprintf(page, "none\n");
3673 metadata_store(mddev_t *mddev, const char *buf, size_t len)
3677 /* Changing the details of 'external' metadata is
3678 * always permitted. Otherwise there must be
3679 * no devices attached to the array.
3681 if (mddev->external && strncmp(buf, "external:", 9) == 0)
3683 else if (!list_empty(&mddev->disks))
3686 if (cmd_match(buf, "none")) {
3687 mddev->persistent = 0;
3688 mddev->external = 0;
3689 mddev->major_version = 0;
3690 mddev->minor_version = 90;
3693 if (strncmp(buf, "external:", 9) == 0) {
3694 size_t namelen = len-9;
3695 if (namelen >= sizeof(mddev->metadata_type))
3696 namelen = sizeof(mddev->metadata_type)-1;
3697 strncpy(mddev->metadata_type, buf+9, namelen);
3698 mddev->metadata_type[namelen] = 0;
3699 if (namelen && mddev->metadata_type[namelen-1] == '\n')
3700 mddev->metadata_type[--namelen] = 0;
3701 mddev->persistent = 0;
3702 mddev->external = 1;
3703 mddev->major_version = 0;
3704 mddev->minor_version = 90;
3707 major = simple_strtoul(buf, &e, 10);
3708 if (e==buf || *e != '.')
3711 minor = simple_strtoul(buf, &e, 10);
3712 if (e==buf || (*e && *e != '\n') )
3714 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
3716 mddev->major_version = major;
3717 mddev->minor_version = minor;
3718 mddev->persistent = 1;
3719 mddev->external = 0;
3723 static struct md_sysfs_entry md_metadata =
3724 __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
3727 action_show(mddev_t *mddev, char *page)
3729 char *type = "idle";
3730 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
3732 else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3733 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) {
3734 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
3736 else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
3737 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
3739 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
3743 } else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
3746 return sprintf(page, "%s\n", type);
3750 action_store(mddev_t *mddev, const char *page, size_t len)
3752 if (!mddev->pers || !mddev->pers->sync_request)
3755 if (cmd_match(page, "frozen"))
3756 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3758 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3760 if (cmd_match(page, "idle") || cmd_match(page, "frozen")) {
3761 if (mddev->sync_thread) {
3762 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
3763 md_unregister_thread(mddev->sync_thread);
3764 mddev->sync_thread = NULL;
3765 mddev->recovery = 0;
3767 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3768 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
3770 else if (cmd_match(page, "resync"))
3771 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3772 else if (cmd_match(page, "recover")) {
3773 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
3774 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3775 } else if (cmd_match(page, "reshape")) {
3777 if (mddev->pers->start_reshape == NULL)
3779 err = mddev->pers->start_reshape(mddev);
3782 sysfs_notify(&mddev->kobj, NULL, "degraded");
3784 if (cmd_match(page, "check"))
3785 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
3786 else if (!cmd_match(page, "repair"))
3788 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
3789 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
3791 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3792 md_wakeup_thread(mddev->thread);
3793 sysfs_notify_dirent_safe(mddev->sysfs_action);
3798 mismatch_cnt_show(mddev_t *mddev, char *page)
3800 return sprintf(page, "%llu\n",
3801 (unsigned long long) mddev->resync_mismatches);
3804 static struct md_sysfs_entry md_scan_mode =
3805 __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
3808 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
3811 sync_min_show(mddev_t *mddev, char *page)
3813 return sprintf(page, "%d (%s)\n", speed_min(mddev),
3814 mddev->sync_speed_min ? "local": "system");
3818 sync_min_store(mddev_t *mddev, const char *buf, size_t len)
3822 if (strncmp(buf, "system", 6)==0) {
3823 mddev->sync_speed_min = 0;
3826 min = simple_strtoul(buf, &e, 10);
3827 if (buf == e || (*e && *e != '\n') || min <= 0)
3829 mddev->sync_speed_min = min;
3833 static struct md_sysfs_entry md_sync_min =
3834 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
3837 sync_max_show(mddev_t *mddev, char *page)
3839 return sprintf(page, "%d (%s)\n", speed_max(mddev),
3840 mddev->sync_speed_max ? "local": "system");
3844 sync_max_store(mddev_t *mddev, const char *buf, size_t len)
3848 if (strncmp(buf, "system", 6)==0) {
3849 mddev->sync_speed_max = 0;
3852 max = simple_strtoul(buf, &e, 10);
3853 if (buf == e || (*e && *e != '\n') || max <= 0)
3855 mddev->sync_speed_max = max;
3859 static struct md_sysfs_entry md_sync_max =
3860 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
3863 degraded_show(mddev_t *mddev, char *page)
3865 return sprintf(page, "%d\n", mddev->degraded);
3867 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
3870 sync_force_parallel_show(mddev_t *mddev, char *page)
3872 return sprintf(page, "%d\n", mddev->parallel_resync);
3876 sync_force_parallel_store(mddev_t *mddev, const char *buf, size_t len)
3880 if (strict_strtol(buf, 10, &n))
3883 if (n != 0 && n != 1)
3886 mddev->parallel_resync = n;
3888 if (mddev->sync_thread)
3889 wake_up(&resync_wait);
3894 /* force parallel resync, even with shared block devices */
3895 static struct md_sysfs_entry md_sync_force_parallel =
3896 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
3897 sync_force_parallel_show, sync_force_parallel_store);
3900 sync_speed_show(mddev_t *mddev, char *page)
3902 unsigned long resync, dt, db;
3903 if (mddev->curr_resync == 0)
3904 return sprintf(page, "none\n");
3905 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
3906 dt = (jiffies - mddev->resync_mark) / HZ;
3908 db = resync - mddev->resync_mark_cnt;
3909 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
3912 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
3915 sync_completed_show(mddev_t *mddev, char *page)
3917 unsigned long max_sectors, resync;
3919 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3920 return sprintf(page, "none\n");
3922 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
3923 max_sectors = mddev->resync_max_sectors;
3925 max_sectors = mddev->dev_sectors;
3927 resync = mddev->curr_resync_completed;
3928 return sprintf(page, "%lu / %lu\n", resync, max_sectors);
3931 static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed);
3934 min_sync_show(mddev_t *mddev, char *page)
3936 return sprintf(page, "%llu\n",
3937 (unsigned long long)mddev->resync_min);
3940 min_sync_store(mddev_t *mddev, const char *buf, size_t len)
3942 unsigned long long min;
3943 if (strict_strtoull(buf, 10, &min))
3945 if (min > mddev->resync_max)
3947 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3950 /* Must be a multiple of chunk_size */
3951 if (mddev->chunk_sectors) {
3952 sector_t temp = min;
3953 if (sector_div(temp, mddev->chunk_sectors))
3956 mddev->resync_min = min;
3961 static struct md_sysfs_entry md_min_sync =
3962 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
3965 max_sync_show(mddev_t *mddev, char *page)
3967 if (mddev->resync_max == MaxSector)
3968 return sprintf(page, "max\n");
3970 return sprintf(page, "%llu\n",
3971 (unsigned long long)mddev->resync_max);
3974 max_sync_store(mddev_t *mddev, const char *buf, size_t len)
3976 if (strncmp(buf, "max", 3) == 0)
3977 mddev->resync_max = MaxSector;
3979 unsigned long long max;
3980 if (strict_strtoull(buf, 10, &max))
3982 if (max < mddev->resync_min)
3984 if (max < mddev->resync_max &&
3986 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3989 /* Must be a multiple of chunk_size */
3990 if (mddev->chunk_sectors) {
3991 sector_t temp = max;
3992 if (sector_div(temp, mddev->chunk_sectors))
3995 mddev->resync_max = max;
3997 wake_up(&mddev->recovery_wait);
4001 static struct md_sysfs_entry md_max_sync =
4002 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
4005 suspend_lo_show(mddev_t *mddev, char *page)
4007 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
4011 suspend_lo_store(mddev_t *mddev, const char *buf, size_t len)
4014 unsigned long long new = simple_strtoull(buf, &e, 10);
4016 if (mddev->pers == NULL ||
4017 mddev->pers->quiesce == NULL)
4019 if (buf == e || (*e && *e != '\n'))
4021 if (new >= mddev->suspend_hi ||
4022 (new > mddev->suspend_lo && new < mddev->suspend_hi)) {
4023 mddev->suspend_lo = new;
4024 mddev->pers->quiesce(mddev, 2);
4029 static struct md_sysfs_entry md_suspend_lo =
4030 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
4034 suspend_hi_show(mddev_t *mddev, char *page)
4036 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
4040 suspend_hi_store(mddev_t *mddev, const char *buf, size_t len)
4043 unsigned long long new = simple_strtoull(buf, &e, 10);
4045 if (mddev->pers == NULL ||
4046 mddev->pers->quiesce == NULL)
4048 if (buf == e || (*e && *e != '\n'))
4050 if ((new <= mddev->suspend_lo && mddev->suspend_lo >= mddev->suspend_hi) ||
4051 (new > mddev->suspend_lo && new > mddev->suspend_hi)) {
4052 mddev->suspend_hi = new;
4053 mddev->pers->quiesce(mddev, 1);
4054 mddev->pers->quiesce(mddev, 0);
4059 static struct md_sysfs_entry md_suspend_hi =
4060 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
4063 reshape_position_show(mddev_t *mddev, char *page)
4065 if (mddev->reshape_position != MaxSector)
4066 return sprintf(page, "%llu\n",
4067 (unsigned long long)mddev->reshape_position);
4068 strcpy(page, "none\n");
4073 reshape_position_store(mddev_t *mddev, const char *buf, size_t len)
4076 unsigned long long new = simple_strtoull(buf, &e, 10);
4079 if (buf == e || (*e && *e != '\n'))
4081 mddev->reshape_position = new;
4082 mddev->delta_disks = 0;
4083 mddev->new_level = mddev->level;
4084 mddev->new_layout = mddev->layout;
4085 mddev->new_chunk_sectors = mddev->chunk_sectors;
4089 static struct md_sysfs_entry md_reshape_position =
4090 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
4091 reshape_position_store);
4094 array_size_show(mddev_t *mddev, char *page)
4096 if (mddev->external_size)
4097 return sprintf(page, "%llu\n",
4098 (unsigned long long)mddev->array_sectors/2);
4100 return sprintf(page, "default\n");
4104 array_size_store(mddev_t *mddev, const char *buf, size_t len)
4108 if (strncmp(buf, "default", 7) == 0) {
4110 sectors = mddev->pers->size(mddev, 0, 0);
4112 sectors = mddev->array_sectors;
4114 mddev->external_size = 0;
4116 if (strict_blocks_to_sectors(buf, §ors) < 0)
4118 if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors)
4121 mddev->external_size = 1;
4124 mddev->array_sectors = sectors;
4125 set_capacity(mddev->gendisk, mddev->array_sectors);
4127 revalidate_disk(mddev->gendisk);
4132 static struct md_sysfs_entry md_array_size =
4133 __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show,
4136 static struct attribute *md_default_attrs[] = {
4139 &md_raid_disks.attr,
4140 &md_chunk_size.attr,
4142 &md_resync_start.attr,
4144 &md_new_device.attr,
4145 &md_safe_delay.attr,
4146 &md_array_state.attr,
4147 &md_reshape_position.attr,
4148 &md_array_size.attr,
4149 &max_corr_read_errors.attr,
4153 static struct attribute *md_redundancy_attrs[] = {
4155 &md_mismatches.attr,
4158 &md_sync_speed.attr,
4159 &md_sync_force_parallel.attr,
4160 &md_sync_completed.attr,
4163 &md_suspend_lo.attr,
4164 &md_suspend_hi.attr,
4169 static struct attribute_group md_redundancy_group = {
4171 .attrs = md_redundancy_attrs,
4176 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
4178 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
4179 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
4184 rv = mddev_lock(mddev);
4186 rv = entry->show(mddev, page);
4187 mddev_unlock(mddev);
4193 md_attr_store(struct kobject *kobj, struct attribute *attr,
4194 const char *page, size_t length)
4196 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
4197 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
4202 if (!capable(CAP_SYS_ADMIN))
4204 rv = mddev_lock(mddev);
4205 if (mddev->hold_active == UNTIL_IOCTL)
4206 mddev->hold_active = 0;
4208 rv = entry->store(mddev, page, length);
4209 mddev_unlock(mddev);
4214 static void md_free(struct kobject *ko)
4216 mddev_t *mddev = container_of(ko, mddev_t, kobj);
4218 if (mddev->sysfs_state)
4219 sysfs_put(mddev->sysfs_state);
4221 if (mddev->gendisk) {
4222 del_gendisk(mddev->gendisk);
4223 put_disk(mddev->gendisk);
4226 blk_cleanup_queue(mddev->queue);
4231 static const struct sysfs_ops md_sysfs_ops = {
4232 .show = md_attr_show,
4233 .store = md_attr_store,
4235 static struct kobj_type md_ktype = {
4237 .sysfs_ops = &md_sysfs_ops,
4238 .default_attrs = md_default_attrs,
4243 static void mddev_delayed_delete(struct work_struct *ws)
4245 mddev_t *mddev = container_of(ws, mddev_t, del_work);
4247 sysfs_remove_group(&mddev->kobj, &md_bitmap_group);
4248 kobject_del(&mddev->kobj);
4249 kobject_put(&mddev->kobj);
4252 static int md_alloc(dev_t dev, char *name)
4254 static DEFINE_MUTEX(disks_mutex);
4255 mddev_t *mddev = mddev_find(dev);
4256 struct gendisk *disk;
4265 partitioned = (MAJOR(mddev->unit) != MD_MAJOR);
4266 shift = partitioned ? MdpMinorShift : 0;
4267 unit = MINOR(mddev->unit) >> shift;
4269 /* wait for any previous instance of this device to be
4270 * completely removed (mddev_delayed_delete).
4272 flush_workqueue(md_misc_wq);
4274 mutex_lock(&disks_mutex);
4280 /* Need to ensure that 'name' is not a duplicate.
4283 spin_lock(&all_mddevs_lock);
4285 list_for_each_entry(mddev2, &all_mddevs, all_mddevs)
4286 if (mddev2->gendisk &&
4287 strcmp(mddev2->gendisk->disk_name, name) == 0) {
4288 spin_unlock(&all_mddevs_lock);
4291 spin_unlock(&all_mddevs_lock);
4295 mddev->queue = blk_alloc_queue(GFP_KERNEL);
4298 mddev->queue->queuedata = mddev;
4300 blk_queue_make_request(mddev->queue, md_make_request);
4302 disk = alloc_disk(1 << shift);
4304 blk_cleanup_queue(mddev->queue);
4305 mddev->queue = NULL;
4308 disk->major = MAJOR(mddev->unit);
4309 disk->first_minor = unit << shift;
4311 strcpy(disk->disk_name, name);
4312 else if (partitioned)
4313 sprintf(disk->disk_name, "md_d%d", unit);
4315 sprintf(disk->disk_name, "md%d", unit);
4316 disk->fops = &md_fops;
4317 disk->private_data = mddev;
4318 disk->queue = mddev->queue;
4319 /* Allow extended partitions. This makes the
4320 * 'mdp' device redundant, but we can't really
4323 disk->flags |= GENHD_FL_EXT_DEVT;
4325 mddev->gendisk = disk;
4326 error = kobject_init_and_add(&mddev->kobj, &md_ktype,
4327 &disk_to_dev(disk)->kobj, "%s", "md");
4329 /* This isn't possible, but as kobject_init_and_add is marked
4330 * __must_check, we must do something with the result
4332 printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
4336 if (mddev->kobj.sd &&
4337 sysfs_create_group(&mddev->kobj, &md_bitmap_group))
4338 printk(KERN_DEBUG "pointless warning\n");
4340 blk_queue_flush(mddev->queue, REQ_FLUSH | REQ_FUA);
4342 mutex_unlock(&disks_mutex);
4343 if (!error && mddev->kobj.sd) {
4344 kobject_uevent(&mddev->kobj, KOBJ_ADD);
4345 mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state");
4351 static struct kobject *md_probe(dev_t dev, int *part, void *data)
4353 md_alloc(dev, NULL);
4357 static int add_named_array(const char *val, struct kernel_param *kp)
4359 /* val must be "md_*" where * is not all digits.
4360 * We allocate an array with a large free minor number, and
4361 * set the name to val. val must not already be an active name.
4363 int len = strlen(val);
4364 char buf[DISK_NAME_LEN];
4366 while (len && val[len-1] == '\n')
4368 if (len >= DISK_NAME_LEN)
4370 strlcpy(buf, val, len+1);
4371 if (strncmp(buf, "md_", 3) != 0)
4373 return md_alloc(0, buf);
4376 static void md_safemode_timeout(unsigned long data)
4378 mddev_t *mddev = (mddev_t *) data;
4380 if (!atomic_read(&mddev->writes_pending)) {
4381 mddev->safemode = 1;
4382 if (mddev->external)
4383 sysfs_notify_dirent_safe(mddev->sysfs_state);
4385 md_wakeup_thread(mddev->thread);
4388 static int start_dirty_degraded;
4390 int md_run(mddev_t *mddev)
4394 struct mdk_personality *pers;
4396 if (list_empty(&mddev->disks))
4397 /* cannot run an array with no devices.. */
4402 /* Cannot run until previous stop completes properly */
4403 if (mddev->sysfs_active)
4407 * Analyze all RAID superblock(s)
4409 if (!mddev->raid_disks) {
4410 if (!mddev->persistent)
4415 if (mddev->level != LEVEL_NONE)
4416 request_module("md-level-%d", mddev->level);
4417 else if (mddev->clevel[0])
4418 request_module("md-%s", mddev->clevel);
4421 * Drop all container device buffers, from now on
4422 * the only valid external interface is through the md
4425 list_for_each_entry(rdev, &mddev->disks, same_set) {
4426 if (test_bit(Faulty, &rdev->flags))
4428 sync_blockdev(rdev->bdev);
4429 invalidate_bdev(rdev->bdev);
4431 /* perform some consistency tests on the device.
4432 * We don't want the data to overlap the metadata,
4433 * Internal Bitmap issues have been handled elsewhere.
4435 if (rdev->data_offset < rdev->sb_start) {
4436 if (mddev->dev_sectors &&
4437 rdev->data_offset + mddev->dev_sectors
4439 printk("md: %s: data overlaps metadata\n",
4444 if (rdev->sb_start + rdev->sb_size/512
4445 > rdev->data_offset) {
4446 printk("md: %s: metadata overlaps data\n",
4451 sysfs_notify_dirent_safe(rdev->sysfs_state);
4454 if (mddev->bio_set == NULL)
4455 mddev->bio_set = bioset_create(BIO_POOL_SIZE, sizeof(mddev));
4457 spin_lock(&pers_lock);
4458 pers = find_pers(mddev->level, mddev->clevel);
4459 if (!pers || !try_module_get(pers->owner)) {
4460 spin_unlock(&pers_lock);
4461 if (mddev->level != LEVEL_NONE)
4462 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
4465 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
4470 spin_unlock(&pers_lock);
4471 if (mddev->level != pers->level) {
4472 mddev->level = pers->level;
4473 mddev->new_level = pers->level;
4475 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
4477 if (mddev->reshape_position != MaxSector &&
4478 pers->start_reshape == NULL) {
4479 /* This personality cannot handle reshaping... */
4481 module_put(pers->owner);
4485 if (pers->sync_request) {
4486 /* Warn if this is a potentially silly
4489 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
4493 list_for_each_entry(rdev, &mddev->disks, same_set)
4494 list_for_each_entry(rdev2, &mddev->disks, same_set) {
4496 rdev->bdev->bd_contains ==
4497 rdev2->bdev->bd_contains) {
4499 "%s: WARNING: %s appears to be"
4500 " on the same physical disk as"
4503 bdevname(rdev->bdev,b),
4504 bdevname(rdev2->bdev,b2));
4511 "True protection against single-disk"
4512 " failure might be compromised.\n");
4515 mddev->recovery = 0;
4516 /* may be over-ridden by personality */
4517 mddev->resync_max_sectors = mddev->dev_sectors;
4519 mddev->ok_start_degraded = start_dirty_degraded;
4521 if (start_readonly && mddev->ro == 0)
4522 mddev->ro = 2; /* read-only, but switch on first write */
4524 err = mddev->pers->run(mddev);
4526 printk(KERN_ERR "md: pers->run() failed ...\n");
4527 else if (mddev->pers->size(mddev, 0, 0) < mddev->array_sectors) {
4528 WARN_ONCE(!mddev->external_size, "%s: default size too small,"
4529 " but 'external_size' not in effect?\n", __func__);
4531 "md: invalid array_size %llu > default size %llu\n",
4532 (unsigned long long)mddev->array_sectors / 2,
4533 (unsigned long long)mddev->pers->size(mddev, 0, 0) / 2);
4535 mddev->pers->stop(mddev);
4537 if (err == 0 && mddev->pers->sync_request) {
4538 err = bitmap_create(mddev);
4540 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
4541 mdname(mddev), err);
4542 mddev->pers->stop(mddev);
4546 module_put(mddev->pers->owner);
4548 bitmap_destroy(mddev);
4551 if (mddev->pers->sync_request) {
4552 if (mddev->kobj.sd &&
4553 sysfs_create_group(&mddev->kobj, &md_redundancy_group))
4555 "md: cannot register extra attributes for %s\n",
4557 mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action");
4558 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
4561 atomic_set(&mddev->writes_pending,0);
4562 atomic_set(&mddev->max_corr_read_errors,
4563 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS);
4564 mddev->safemode = 0;
4565 mddev->safemode_timer.function = md_safemode_timeout;
4566 mddev->safemode_timer.data = (unsigned long) mddev;
4567 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
4571 list_for_each_entry(rdev, &mddev->disks, same_set)
4572 if (rdev->raid_disk >= 0) {
4574 sprintf(nm, "rd%d", rdev->raid_disk);
4575 if (sysfs_create_link(&mddev->kobj, &rdev->kobj, nm))
4576 /* failure here is OK */;
4579 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4582 md_update_sb(mddev, 0);
4584 md_wakeup_thread(mddev->thread);
4585 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
4587 md_new_event(mddev);
4588 sysfs_notify_dirent_safe(mddev->sysfs_state);
4589 sysfs_notify_dirent_safe(mddev->sysfs_action);
4590 sysfs_notify(&mddev->kobj, NULL, "degraded");
4593 EXPORT_SYMBOL_GPL(md_run);
4595 static int do_md_run(mddev_t *mddev)
4599 err = md_run(mddev);
4602 err = bitmap_load(mddev);
4604 bitmap_destroy(mddev);
4607 set_capacity(mddev->gendisk, mddev->array_sectors);
4608 revalidate_disk(mddev->gendisk);
4609 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
4614 static int restart_array(mddev_t *mddev)
4616 struct gendisk *disk = mddev->gendisk;
4618 /* Complain if it has no devices */
4619 if (list_empty(&mddev->disks))
4625 mddev->safemode = 0;
4627 set_disk_ro(disk, 0);
4628 printk(KERN_INFO "md: %s switched to read-write mode.\n",
4630 /* Kick recovery or resync if necessary */
4631 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4632 md_wakeup_thread(mddev->thread);
4633 md_wakeup_thread(mddev->sync_thread);
4634 sysfs_notify_dirent_safe(mddev->sysfs_state);
4638 /* similar to deny_write_access, but accounts for our holding a reference
4639 * to the file ourselves */
4640 static int deny_bitmap_write_access(struct file * file)
4642 struct inode *inode = file->f_mapping->host;
4644 spin_lock(&inode->i_lock);
4645 if (atomic_read(&inode->i_writecount) > 1) {
4646 spin_unlock(&inode->i_lock);
4649 atomic_set(&inode->i_writecount, -1);
4650 spin_unlock(&inode->i_lock);
4655 void restore_bitmap_write_access(struct file *file)
4657 struct inode *inode = file->f_mapping->host;
4659 spin_lock(&inode->i_lock);
4660 atomic_set(&inode->i_writecount, 1);
4661 spin_unlock(&inode->i_lock);
4664 static void md_clean(mddev_t *mddev)
4666 mddev->array_sectors = 0;
4667 mddev->external_size = 0;
4668 mddev->dev_sectors = 0;
4669 mddev->raid_disks = 0;
4670 mddev->recovery_cp = 0;
4671 mddev->resync_min = 0;
4672 mddev->resync_max = MaxSector;
4673 mddev->reshape_position = MaxSector;
4674 mddev->external = 0;
4675 mddev->persistent = 0;
4676 mddev->level = LEVEL_NONE;
4677 mddev->clevel[0] = 0;
4680 mddev->metadata_type[0] = 0;
4681 mddev->chunk_sectors = 0;
4682 mddev->ctime = mddev->utime = 0;
4684 mddev->max_disks = 0;
4686 mddev->can_decrease_events = 0;
4687 mddev->delta_disks = 0;
4688 mddev->new_level = LEVEL_NONE;
4689 mddev->new_layout = 0;
4690 mddev->new_chunk_sectors = 0;
4691 mddev->curr_resync = 0;
4692 mddev->resync_mismatches = 0;
4693 mddev->suspend_lo = mddev->suspend_hi = 0;
4694 mddev->sync_speed_min = mddev->sync_speed_max = 0;
4695 mddev->recovery = 0;
4697 mddev->degraded = 0;
4698 mddev->safemode = 0;
4699 mddev->bitmap_info.offset = 0;
4700 mddev->bitmap_info.default_offset = 0;
4701 mddev->bitmap_info.chunksize = 0;
4702 mddev->bitmap_info.daemon_sleep = 0;
4703 mddev->bitmap_info.max_write_behind = 0;
4707 void md_stop_writes(mddev_t *mddev)
4709 if (mddev->sync_thread) {
4710 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4711 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4712 md_unregister_thread(mddev->sync_thread);
4713 mddev->sync_thread = NULL;
4716 del_timer_sync(&mddev->safemode_timer);
4718 bitmap_flush(mddev);
4719 md_super_wait(mddev);
4721 if (!mddev->in_sync || mddev->flags) {
4722 /* mark array as shutdown cleanly */
4724 md_update_sb(mddev, 1);
4727 EXPORT_SYMBOL_GPL(md_stop_writes);
4729 void md_stop(mddev_t *mddev)
4732 mddev->pers->stop(mddev);
4733 if (mddev->pers->sync_request && mddev->to_remove == NULL)
4734 mddev->to_remove = &md_redundancy_group;
4735 module_put(mddev->pers->owner);
4737 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4739 EXPORT_SYMBOL_GPL(md_stop);
4741 static int md_set_readonly(mddev_t *mddev, int is_open)
4744 mutex_lock(&mddev->open_mutex);
4745 if (atomic_read(&mddev->openers) > is_open) {
4746 printk("md: %s still in use.\n",mdname(mddev));
4751 md_stop_writes(mddev);
4757 set_disk_ro(mddev->gendisk, 1);
4758 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4759 sysfs_notify_dirent_safe(mddev->sysfs_state);
4763 mutex_unlock(&mddev->open_mutex);
4768 * 0 - completely stop and dis-assemble array
4769 * 2 - stop but do not disassemble array
4771 static int do_md_stop(mddev_t * mddev, int mode, int is_open)
4773 struct gendisk *disk = mddev->gendisk;
4776 mutex_lock(&mddev->open_mutex);
4777 if (atomic_read(&mddev->openers) > is_open ||
4778 mddev->sysfs_active) {
4779 printk("md: %s still in use.\n",mdname(mddev));
4780 mutex_unlock(&mddev->open_mutex);
4786 set_disk_ro(disk, 0);
4788 md_stop_writes(mddev);
4790 mddev->queue->merge_bvec_fn = NULL;
4791 mddev->queue->unplug_fn = NULL;
4792 mddev->queue->backing_dev_info.congested_fn = NULL;
4794 /* tell userspace to handle 'inactive' */
4795 sysfs_notify_dirent_safe(mddev->sysfs_state);
4797 list_for_each_entry(rdev, &mddev->disks, same_set)
4798 if (rdev->raid_disk >= 0) {
4800 sprintf(nm, "rd%d", rdev->raid_disk);
4801 sysfs_remove_link(&mddev->kobj, nm);
4804 set_capacity(disk, 0);
4805 mutex_unlock(&mddev->open_mutex);
4806 revalidate_disk(disk);
4811 mutex_unlock(&mddev->open_mutex);
4813 * Free resources if final stop
4816 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
4818 bitmap_destroy(mddev);
4819 if (mddev->bitmap_info.file) {
4820 restore_bitmap_write_access(mddev->bitmap_info.file);
4821 fput(mddev->bitmap_info.file);
4822 mddev->bitmap_info.file = NULL;
4824 mddev->bitmap_info.offset = 0;
4826 export_array(mddev);
4829 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
4830 if (mddev->hold_active == UNTIL_STOP)
4831 mddev->hold_active = 0;
4833 blk_integrity_unregister(disk);
4834 md_new_event(mddev);
4835 sysfs_notify_dirent_safe(mddev->sysfs_state);
4840 static void autorun_array(mddev_t *mddev)
4845 if (list_empty(&mddev->disks))
4848 printk(KERN_INFO "md: running: ");
4850 list_for_each_entry(rdev, &mddev->disks, same_set) {
4851 char b[BDEVNAME_SIZE];
4852 printk("<%s>", bdevname(rdev->bdev,b));
4856 err = do_md_run(mddev);
4858 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
4859 do_md_stop(mddev, 0, 0);
4864 * lets try to run arrays based on all disks that have arrived
4865 * until now. (those are in pending_raid_disks)
4867 * the method: pick the first pending disk, collect all disks with
4868 * the same UUID, remove all from the pending list and put them into
4869 * the 'same_array' list. Then order this list based on superblock
4870 * update time (freshest comes first), kick out 'old' disks and
4871 * compare superblocks. If everything's fine then run it.
4873 * If "unit" is allocated, then bump its reference count
4875 static void autorun_devices(int part)
4877 mdk_rdev_t *rdev0, *rdev, *tmp;
4879 char b[BDEVNAME_SIZE];
4881 printk(KERN_INFO "md: autorun ...\n");
4882 while (!list_empty(&pending_raid_disks)) {
4885 LIST_HEAD(candidates);
4886 rdev0 = list_entry(pending_raid_disks.next,
4887 mdk_rdev_t, same_set);
4889 printk(KERN_INFO "md: considering %s ...\n",
4890 bdevname(rdev0->bdev,b));
4891 INIT_LIST_HEAD(&candidates);
4892 rdev_for_each_list(rdev, tmp, &pending_raid_disks)
4893 if (super_90_load(rdev, rdev0, 0) >= 0) {
4894 printk(KERN_INFO "md: adding %s ...\n",
4895 bdevname(rdev->bdev,b));
4896 list_move(&rdev->same_set, &candidates);
4899 * now we have a set of devices, with all of them having
4900 * mostly sane superblocks. It's time to allocate the
4904 dev = MKDEV(mdp_major,
4905 rdev0->preferred_minor << MdpMinorShift);
4906 unit = MINOR(dev) >> MdpMinorShift;
4908 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
4911 if (rdev0->preferred_minor != unit) {
4912 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
4913 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
4917 md_probe(dev, NULL, NULL);
4918 mddev = mddev_find(dev);
4919 if (!mddev || !mddev->gendisk) {
4923 "md: cannot allocate memory for md drive.\n");
4926 if (mddev_lock(mddev))
4927 printk(KERN_WARNING "md: %s locked, cannot run\n",
4929 else if (mddev->raid_disks || mddev->major_version
4930 || !list_empty(&mddev->disks)) {
4932 "md: %s already running, cannot run %s\n",
4933 mdname(mddev), bdevname(rdev0->bdev,b));
4934 mddev_unlock(mddev);
4936 printk(KERN_INFO "md: created %s\n", mdname(mddev));
4937 mddev->persistent = 1;
4938 rdev_for_each_list(rdev, tmp, &candidates) {
4939 list_del_init(&rdev->same_set);
4940 if (bind_rdev_to_array(rdev, mddev))
4943 autorun_array(mddev);
4944 mddev_unlock(mddev);
4946 /* on success, candidates will be empty, on error
4949 rdev_for_each_list(rdev, tmp, &candidates) {
4950 list_del_init(&rdev->same_set);
4955 printk(KERN_INFO "md: ... autorun DONE.\n");
4957 #endif /* !MODULE */
4959 static int get_version(void __user * arg)
4963 ver.major = MD_MAJOR_VERSION;
4964 ver.minor = MD_MINOR_VERSION;
4965 ver.patchlevel = MD_PATCHLEVEL_VERSION;
4967 if (copy_to_user(arg, &ver, sizeof(ver)))
4973 static int get_array_info(mddev_t * mddev, void __user * arg)
4975 mdu_array_info_t info;
4976 int nr,working,insync,failed,spare;
4979 nr=working=insync=failed=spare=0;
4980 list_for_each_entry(rdev, &mddev->disks, same_set) {
4982 if (test_bit(Faulty, &rdev->flags))
4986 if (test_bit(In_sync, &rdev->flags))
4993 info.major_version = mddev->major_version;
4994 info.minor_version = mddev->minor_version;
4995 info.patch_version = MD_PATCHLEVEL_VERSION;
4996 info.ctime = mddev->ctime;
4997 info.level = mddev->level;
4998 info.size = mddev->dev_sectors / 2;
4999 if (info.size != mddev->dev_sectors / 2) /* overflow */
5002 info.raid_disks = mddev->raid_disks;
5003 info.md_minor = mddev->md_minor;
5004 info.not_persistent= !mddev->persistent;
5006 info.utime = mddev->utime;
5009 info.state = (1<<MD_SB_CLEAN);
5010 if (mddev->bitmap && mddev->bitmap_info.offset)
5011 info.state = (1<<MD_SB_BITMAP_PRESENT);
5012 info.active_disks = insync;
5013 info.working_disks = working;
5014 info.failed_disks = failed;
5015 info.spare_disks = spare;
5017 info.layout = mddev->layout;
5018 info.chunk_size = mddev->chunk_sectors << 9;
5020 if (copy_to_user(arg, &info, sizeof(info)))
5026 static int get_bitmap_file(mddev_t * mddev, void __user * arg)
5028 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
5029 char *ptr, *buf = NULL;
5032 if (md_allow_write(mddev))
5033 file = kmalloc(sizeof(*file), GFP_NOIO);
5035 file = kmalloc(sizeof(*file), GFP_KERNEL);
5040 /* bitmap disabled, zero the first byte and copy out */
5041 if (!mddev->bitmap || !mddev->bitmap->file) {
5042 file->pathname[0] = '\0';
5046 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
5050 ptr = d_path(&mddev->bitmap->file->f_path, buf, sizeof(file->pathname));
5054 strcpy(file->pathname, ptr);
5058 if (copy_to_user(arg, file, sizeof(*file)))
5066 static int get_disk_info(mddev_t * mddev, void __user * arg)
5068 mdu_disk_info_t info;
5071 if (copy_from_user(&info, arg, sizeof(info)))
5074 rdev = find_rdev_nr(mddev, info.number);
5076 info.major = MAJOR(rdev->bdev->bd_dev);
5077 info.minor = MINOR(rdev->bdev->bd_dev);
5078 info.raid_disk = rdev->raid_disk;
5080 if (test_bit(Faulty, &rdev->flags))
5081 info.state |= (1<<MD_DISK_FAULTY);
5082 else if (test_bit(In_sync, &rdev->flags)) {
5083 info.state |= (1<<MD_DISK_ACTIVE);
5084 info.state |= (1<<MD_DISK_SYNC);
5086 if (test_bit(WriteMostly, &rdev->flags))
5087 info.state |= (1<<MD_DISK_WRITEMOSTLY);
5089 info.major = info.minor = 0;
5090 info.raid_disk = -1;
5091 info.state = (1<<MD_DISK_REMOVED);
5094 if (copy_to_user(arg, &info, sizeof(info)))
5100 static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
5102 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
5104 dev_t dev = MKDEV(info->major,info->minor);
5106 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
5109 if (!mddev->raid_disks) {
5111 /* expecting a device which has a superblock */
5112 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
5115 "md: md_import_device returned %ld\n",
5117 return PTR_ERR(rdev);
5119 if (!list_empty(&mddev->disks)) {
5120 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
5121 mdk_rdev_t, same_set);
5122 err = super_types[mddev->major_version]
5123 .load_super(rdev, rdev0, mddev->minor_version);
5126 "md: %s has different UUID to %s\n",
5127 bdevname(rdev->bdev,b),
5128 bdevname(rdev0->bdev,b2));
5133 err = bind_rdev_to_array(rdev, mddev);
5140 * add_new_disk can be used once the array is assembled
5141 * to add "hot spares". They must already have a superblock
5146 if (!mddev->pers->hot_add_disk) {
5148 "%s: personality does not support diskops!\n",
5152 if (mddev->persistent)
5153 rdev = md_import_device(dev, mddev->major_version,
5154 mddev->minor_version);
5156 rdev = md_import_device(dev, -1, -1);
5159 "md: md_import_device returned %ld\n",
5161 return PTR_ERR(rdev);
5163 /* set saved_raid_disk if appropriate */
5164 if (!mddev->persistent) {
5165 if (info->state & (1<<MD_DISK_SYNC) &&
5166 info->raid_disk < mddev->raid_disks) {
5167 rdev->raid_disk = info->raid_disk;
5168 set_bit(In_sync, &rdev->flags);
5170 rdev->raid_disk = -1;
5172 super_types[mddev->major_version].
5173 validate_super(mddev, rdev);
5174 if (test_bit(In_sync, &rdev->flags))
5175 rdev->saved_raid_disk = rdev->raid_disk;
5177 rdev->saved_raid_disk = -1;
5179 clear_bit(In_sync, &rdev->flags); /* just to be sure */
5180 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
5181 set_bit(WriteMostly, &rdev->flags);
5183 clear_bit(WriteMostly, &rdev->flags);
5185 rdev->raid_disk = -1;
5186 err = bind_rdev_to_array(rdev, mddev);
5187 if (!err && !mddev->pers->hot_remove_disk) {
5188 /* If there is hot_add_disk but no hot_remove_disk
5189 * then added disks for geometry changes,
5190 * and should be added immediately.
5192 super_types[mddev->major_version].
5193 validate_super(mddev, rdev);
5194 err = mddev->pers->hot_add_disk(mddev, rdev);
5196 unbind_rdev_from_array(rdev);
5201 sysfs_notify_dirent_safe(rdev->sysfs_state);
5203 md_update_sb(mddev, 1);
5204 if (mddev->degraded)
5205 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
5206 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5207 md_wakeup_thread(mddev->thread);
5211 /* otherwise, add_new_disk is only allowed
5212 * for major_version==0 superblocks
5214 if (mddev->major_version != 0) {
5215 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
5220 if (!(info->state & (1<<MD_DISK_FAULTY))) {
5222 rdev = md_import_device(dev, -1, 0);
5225 "md: error, md_import_device() returned %ld\n",
5227 return PTR_ERR(rdev);
5229 rdev->desc_nr = info->number;
5230 if (info->raid_disk < mddev->raid_disks)
5231 rdev->raid_disk = info->raid_disk;
5233 rdev->raid_disk = -1;
5235 if (rdev->raid_disk < mddev->raid_disks)
5236 if (info->state & (1<<MD_DISK_SYNC))
5237 set_bit(In_sync, &rdev->flags);
5239 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
5240 set_bit(WriteMostly, &rdev->flags);
5242 if (!mddev->persistent) {
5243 printk(KERN_INFO "md: nonpersistent superblock ...\n");
5244 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
5246 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
5247 rdev->sectors = rdev->sb_start;
5249 err = bind_rdev_to_array(rdev, mddev);
5259 static int hot_remove_disk(mddev_t * mddev, dev_t dev)
5261 char b[BDEVNAME_SIZE];
5264 rdev = find_rdev(mddev, dev);
5268 if (rdev->raid_disk >= 0)
5271 kick_rdev_from_array(rdev);
5272 md_update_sb(mddev, 1);
5273 md_new_event(mddev);
5277 printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n",
5278 bdevname(rdev->bdev,b), mdname(mddev));
5282 static int hot_add_disk(mddev_t * mddev, dev_t dev)
5284 char b[BDEVNAME_SIZE];
5291 if (mddev->major_version != 0) {
5292 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
5293 " version-0 superblocks.\n",
5297 if (!mddev->pers->hot_add_disk) {
5299 "%s: personality does not support diskops!\n",
5304 rdev = md_import_device(dev, -1, 0);
5307 "md: error, md_import_device() returned %ld\n",
5312 if (mddev->persistent)
5313 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
5315 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
5317 rdev->sectors = rdev->sb_start;
5319 if (test_bit(Faulty, &rdev->flags)) {
5321 "md: can not hot-add faulty %s disk to %s!\n",
5322 bdevname(rdev->bdev,b), mdname(mddev));
5326 clear_bit(In_sync, &rdev->flags);
5328 rdev->saved_raid_disk = -1;
5329 err = bind_rdev_to_array(rdev, mddev);
5334 * The rest should better be atomic, we can have disk failures
5335 * noticed in interrupt contexts ...
5338 rdev->raid_disk = -1;
5340 md_update_sb(mddev, 1);
5343 * Kick recovery, maybe this spare has to be added to the
5344 * array immediately.
5346 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5347 md_wakeup_thread(mddev->thread);
5348 md_new_event(mddev);
5356 static int set_bitmap_file(mddev_t *mddev, int fd)
5361 if (!mddev->pers->quiesce)
5363 if (mddev->recovery || mddev->sync_thread)
5365 /* we should be able to change the bitmap.. */
5371 return -EEXIST; /* cannot add when bitmap is present */
5372 mddev->bitmap_info.file = fget(fd);
5374 if (mddev->bitmap_info.file == NULL) {
5375 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
5380 err = deny_bitmap_write_access(mddev->bitmap_info.file);
5382 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
5384 fput(mddev->bitmap_info.file);
5385 mddev->bitmap_info.file = NULL;
5388 mddev->bitmap_info.offset = 0; /* file overrides offset */
5389 } else if (mddev->bitmap == NULL)
5390 return -ENOENT; /* cannot remove what isn't there */
5393 mddev->pers->quiesce(mddev, 1);
5395 err = bitmap_create(mddev);
5397 err = bitmap_load(mddev);
5399 if (fd < 0 || err) {
5400 bitmap_destroy(mddev);
5401 fd = -1; /* make sure to put the file */
5403 mddev->pers->quiesce(mddev, 0);
5406 if (mddev->bitmap_info.file) {
5407 restore_bitmap_write_access(mddev->bitmap_info.file);
5408 fput(mddev->bitmap_info.file);
5410 mddev->bitmap_info.file = NULL;
5417 * set_array_info is used two different ways
5418 * The original usage is when creating a new array.
5419 * In this usage, raid_disks is > 0 and it together with
5420 * level, size, not_persistent,layout,chunksize determine the
5421 * shape of the array.
5422 * This will always create an array with a type-0.90.0 superblock.
5423 * The newer usage is when assembling an array.
5424 * In this case raid_disks will be 0, and the major_version field is
5425 * use to determine which style super-blocks are to be found on the devices.
5426 * The minor and patch _version numbers are also kept incase the
5427 * super_block handler wishes to interpret them.
5429 static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
5432 if (info->raid_disks == 0) {
5433 /* just setting version number for superblock loading */
5434 if (info->major_version < 0 ||
5435 info->major_version >= ARRAY_SIZE(super_types) ||
5436 super_types[info->major_version].name == NULL) {
5437 /* maybe try to auto-load a module? */
5439 "md: superblock version %d not known\n",
5440 info->major_version);
5443 mddev->major_version = info->major_version;
5444 mddev->minor_version = info->minor_version;
5445 mddev->patch_version = info->patch_version;
5446 mddev->persistent = !info->not_persistent;
5447 /* ensure mddev_put doesn't delete this now that there
5448 * is some minimal configuration.
5450 mddev->ctime = get_seconds();
5453 mddev->major_version = MD_MAJOR_VERSION;
5454 mddev->minor_version = MD_MINOR_VERSION;
5455 mddev->patch_version = MD_PATCHLEVEL_VERSION;
5456 mddev->ctime = get_seconds();
5458 mddev->level = info->level;
5459 mddev->clevel[0] = 0;
5460 mddev->dev_sectors = 2 * (sector_t)info->size;
5461 mddev->raid_disks = info->raid_disks;
5462 /* don't set md_minor, it is determined by which /dev/md* was
5465 if (info->state & (1<<MD_SB_CLEAN))
5466 mddev->recovery_cp = MaxSector;
5468 mddev->recovery_cp = 0;
5469 mddev->persistent = ! info->not_persistent;
5470 mddev->external = 0;
5472 mddev->layout = info->layout;
5473 mddev->chunk_sectors = info->chunk_size >> 9;
5475 mddev->max_disks = MD_SB_DISKS;
5477 if (mddev->persistent)
5479 set_bit(MD_CHANGE_DEVS, &mddev->flags);
5481 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
5482 mddev->bitmap_info.offset = 0;
5484 mddev->reshape_position = MaxSector;
5487 * Generate a 128 bit UUID
5489 get_random_bytes(mddev->uuid, 16);
5491 mddev->new_level = mddev->level;
5492 mddev->new_chunk_sectors = mddev->chunk_sectors;
5493 mddev->new_layout = mddev->layout;
5494 mddev->delta_disks = 0;
5499 void md_set_array_sectors(mddev_t *mddev, sector_t array_sectors)
5501 WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__);
5503 if (mddev->external_size)
5506 mddev->array_sectors = array_sectors;
5508 EXPORT_SYMBOL(md_set_array_sectors);
5510 static int update_size(mddev_t *mddev, sector_t num_sectors)
5514 int fit = (num_sectors == 0);
5516 if (mddev->pers->resize == NULL)
5518 /* The "num_sectors" is the number of sectors of each device that
5519 * is used. This can only make sense for arrays with redundancy.
5520 * linear and raid0 always use whatever space is available. We can only
5521 * consider changing this number if no resync or reconstruction is
5522 * happening, and if the new size is acceptable. It must fit before the
5523 * sb_start or, if that is <data_offset, it must fit before the size
5524 * of each device. If num_sectors is zero, we find the largest size
5528 if (mddev->sync_thread)
5531 /* Sorry, cannot grow a bitmap yet, just remove it,
5535 list_for_each_entry(rdev, &mddev->disks, same_set) {
5536 sector_t avail = rdev->sectors;
5538 if (fit && (num_sectors == 0 || num_sectors > avail))
5539 num_sectors = avail;
5540 if (avail < num_sectors)
5543 rv = mddev->pers->resize(mddev, num_sectors);
5545 revalidate_disk(mddev->gendisk);
5549 static int update_raid_disks(mddev_t *mddev, int raid_disks)
5552 /* change the number of raid disks */
5553 if (mddev->pers->check_reshape == NULL)
5555 if (raid_disks <= 0 ||
5556 (mddev->max_disks && raid_disks >= mddev->max_disks))
5558 if (mddev->sync_thread || mddev->reshape_position != MaxSector)
5560 mddev->delta_disks = raid_disks - mddev->raid_disks;
5562 rv = mddev->pers->check_reshape(mddev);
5568 * update_array_info is used to change the configuration of an
5570 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
5571 * fields in the info are checked against the array.
5572 * Any differences that cannot be handled will cause an error.
5573 * Normally, only one change can be managed at a time.
5575 static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
5581 /* calculate expected state,ignoring low bits */
5582 if (mddev->bitmap && mddev->bitmap_info.offset)
5583 state |= (1 << MD_SB_BITMAP_PRESENT);
5585 if (mddev->major_version != info->major_version ||
5586 mddev->minor_version != info->minor_version ||
5587 /* mddev->patch_version != info->patch_version || */
5588 mddev->ctime != info->ctime ||
5589 mddev->level != info->level ||
5590 /* mddev->layout != info->layout || */
5591 !mddev->persistent != info->not_persistent||
5592 mddev->chunk_sectors != info->chunk_size >> 9 ||
5593 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
5594 ((state^info->state) & 0xfffffe00)
5597 /* Check there is only one change */
5598 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
5600 if (mddev->raid_disks != info->raid_disks)
5602 if (mddev->layout != info->layout)
5604 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT))
5611 if (mddev->layout != info->layout) {
5613 * we don't need to do anything at the md level, the
5614 * personality will take care of it all.
5616 if (mddev->pers->check_reshape == NULL)
5619 mddev->new_layout = info->layout;
5620 rv = mddev->pers->check_reshape(mddev);
5622 mddev->new_layout = mddev->layout;
5626 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
5627 rv = update_size(mddev, (sector_t)info->size * 2);
5629 if (mddev->raid_disks != info->raid_disks)
5630 rv = update_raid_disks(mddev, info->raid_disks);
5632 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
5633 if (mddev->pers->quiesce == NULL)
5635 if (mddev->recovery || mddev->sync_thread)
5637 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
5638 /* add the bitmap */
5641 if (mddev->bitmap_info.default_offset == 0)
5643 mddev->bitmap_info.offset =
5644 mddev->bitmap_info.default_offset;
5645 mddev->pers->quiesce(mddev, 1);
5646 rv = bitmap_create(mddev);
5648 rv = bitmap_load(mddev);
5650 bitmap_destroy(mddev);
5651 mddev->pers->quiesce(mddev, 0);
5653 /* remove the bitmap */
5656 if (mddev->bitmap->file)
5658 mddev->pers->quiesce(mddev, 1);
5659 bitmap_destroy(mddev);
5660 mddev->pers->quiesce(mddev, 0);
5661 mddev->bitmap_info.offset = 0;
5664 md_update_sb(mddev, 1);
5668 static int set_disk_faulty(mddev_t *mddev, dev_t dev)
5672 if (mddev->pers == NULL)
5675 rdev = find_rdev(mddev, dev);
5679 md_error(mddev, rdev);
5684 * We have a problem here : there is no easy way to give a CHS
5685 * virtual geometry. We currently pretend that we have a 2 heads
5686 * 4 sectors (with a BIG number of cylinders...). This drives
5687 * dosfs just mad... ;-)
5689 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
5691 mddev_t *mddev = bdev->bd_disk->private_data;
5695 geo->cylinders = mddev->array_sectors / 8;
5699 static int md_ioctl(struct block_device *bdev, fmode_t mode,
5700 unsigned int cmd, unsigned long arg)
5703 void __user *argp = (void __user *)arg;
5704 mddev_t *mddev = NULL;
5707 if (!capable(CAP_SYS_ADMIN))
5711 * Commands dealing with the RAID driver but not any
5717 err = get_version(argp);
5720 case PRINT_RAID_DEBUG:
5728 autostart_arrays(arg);
5735 * Commands creating/starting a new array:
5738 mddev = bdev->bd_disk->private_data;
5745 err = mddev_lock(mddev);
5748 "md: ioctl lock interrupted, reason %d, cmd %d\n",
5755 case SET_ARRAY_INFO:
5757 mdu_array_info_t info;
5759 memset(&info, 0, sizeof(info));
5760 else if (copy_from_user(&info, argp, sizeof(info))) {
5765 err = update_array_info(mddev, &info);
5767 printk(KERN_WARNING "md: couldn't update"
5768 " array info. %d\n", err);
5773 if (!list_empty(&mddev->disks)) {
5775 "md: array %s already has disks!\n",
5780 if (mddev->raid_disks) {
5782 "md: array %s already initialised!\n",
5787 err = set_array_info(mddev, &info);
5789 printk(KERN_WARNING "md: couldn't set"
5790 " array info. %d\n", err);
5800 * Commands querying/configuring an existing array:
5802 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
5803 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
5804 if ((!mddev->raid_disks && !mddev->external)
5805 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
5806 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
5807 && cmd != GET_BITMAP_FILE) {
5813 * Commands even a read-only array can execute:
5817 case GET_ARRAY_INFO:
5818 err = get_array_info(mddev, argp);
5821 case GET_BITMAP_FILE:
5822 err = get_bitmap_file(mddev, argp);
5826 err = get_disk_info(mddev, argp);
5829 case RESTART_ARRAY_RW:
5830 err = restart_array(mddev);
5834 err = do_md_stop(mddev, 0, 1);
5838 err = md_set_readonly(mddev, 1);
5842 if (get_user(ro, (int __user *)(arg))) {
5848 /* if the bdev is going readonly the value of mddev->ro
5849 * does not matter, no writes are coming
5854 /* are we are already prepared for writes? */
5858 /* transitioning to readauto need only happen for
5859 * arrays that call md_write_start
5862 err = restart_array(mddev);
5865 set_disk_ro(mddev->gendisk, 0);
5872 * The remaining ioctls are changing the state of the
5873 * superblock, so we do not allow them on read-only arrays.
5874 * However non-MD ioctls (e.g. get-size) will still come through
5875 * here and hit the 'default' below, so only disallow
5876 * 'md' ioctls, and switch to rw mode if started auto-readonly.
5878 if (_IOC_TYPE(cmd) == MD_MAJOR && mddev->ro && mddev->pers) {
5879 if (mddev->ro == 2) {
5881 sysfs_notify_dirent_safe(mddev->sysfs_state);
5882 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5883 md_wakeup_thread(mddev->thread);
5894 mdu_disk_info_t info;
5895 if (copy_from_user(&info, argp, sizeof(info)))
5898 err = add_new_disk(mddev, &info);
5902 case HOT_REMOVE_DISK:
5903 err = hot_remove_disk(mddev, new_decode_dev(arg));
5907 err = hot_add_disk(mddev, new_decode_dev(arg));
5910 case SET_DISK_FAULTY:
5911 err = set_disk_faulty(mddev, new_decode_dev(arg));
5915 err = do_md_run(mddev);
5918 case SET_BITMAP_FILE:
5919 err = set_bitmap_file(mddev, (int)arg);
5929 if (mddev->hold_active == UNTIL_IOCTL &&
5931 mddev->hold_active = 0;
5932 mddev_unlock(mddev);
5941 #ifdef CONFIG_COMPAT
5942 static int md_compat_ioctl(struct block_device *bdev, fmode_t mode,
5943 unsigned int cmd, unsigned long arg)
5946 case HOT_REMOVE_DISK:
5948 case SET_DISK_FAULTY:
5949 case SET_BITMAP_FILE:
5950 /* These take in integer arg, do not convert */
5953 arg = (unsigned long)compat_ptr(arg);
5957 return md_ioctl(bdev, mode, cmd, arg);
5959 #endif /* CONFIG_COMPAT */
5961 static int md_open(struct block_device *bdev, fmode_t mode)
5964 * Succeed if we can lock the mddev, which confirms that
5965 * it isn't being stopped right now.
5967 mddev_t *mddev = mddev_find(bdev->bd_dev);
5970 if (mddev->gendisk != bdev->bd_disk) {
5971 /* we are racing with mddev_put which is discarding this
5975 /* Wait until bdev->bd_disk is definitely gone */
5976 flush_workqueue(md_misc_wq);
5977 /* Then retry the open from the top */
5978 return -ERESTARTSYS;
5980 BUG_ON(mddev != bdev->bd_disk->private_data);
5982 if ((err = mutex_lock_interruptible(&mddev->open_mutex)))
5986 atomic_inc(&mddev->openers);
5987 mutex_unlock(&mddev->open_mutex);
5989 check_disk_size_change(mddev->gendisk, bdev);
5994 static int md_release(struct gendisk *disk, fmode_t mode)
5996 mddev_t *mddev = disk->private_data;
5999 atomic_dec(&mddev->openers);
6004 static const struct block_device_operations md_fops =
6006 .owner = THIS_MODULE,
6008 .release = md_release,
6010 #ifdef CONFIG_COMPAT
6011 .compat_ioctl = md_compat_ioctl,
6013 .getgeo = md_getgeo,
6016 static int md_thread(void * arg)
6018 mdk_thread_t *thread = arg;
6021 * md_thread is a 'system-thread', it's priority should be very
6022 * high. We avoid resource deadlocks individually in each
6023 * raid personality. (RAID5 does preallocation) We also use RR and
6024 * the very same RT priority as kswapd, thus we will never get
6025 * into a priority inversion deadlock.
6027 * we definitely have to have equal or higher priority than
6028 * bdflush, otherwise bdflush will deadlock if there are too
6029 * many dirty RAID5 blocks.
6032 allow_signal(SIGKILL);
6033 while (!kthread_should_stop()) {
6035 /* We need to wait INTERRUPTIBLE so that
6036 * we don't add to the load-average.
6037 * That means we need to be sure no signals are
6040 if (signal_pending(current))
6041 flush_signals(current);
6043 wait_event_interruptible_timeout
6045 test_bit(THREAD_WAKEUP, &thread->flags)
6046 || kthread_should_stop(),
6049 clear_bit(THREAD_WAKEUP, &thread->flags);
6050 if (!kthread_should_stop())
6051 thread->run(thread->mddev);
6057 void md_wakeup_thread(mdk_thread_t *thread)
6060 dprintk("md: waking up MD thread %s.\n", thread->tsk->comm);
6061 set_bit(THREAD_WAKEUP, &thread->flags);
6062 wake_up(&thread->wqueue);
6066 mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
6069 mdk_thread_t *thread;
6071 thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL);
6075 init_waitqueue_head(&thread->wqueue);
6078 thread->mddev = mddev;
6079 thread->timeout = MAX_SCHEDULE_TIMEOUT;
6080 thread->tsk = kthread_run(md_thread, thread,
6082 mdname(thread->mddev),
6083 name ?: mddev->pers->name);
6084 if (IS_ERR(thread->tsk)) {
6091 void md_unregister_thread(mdk_thread_t *thread)
6095 dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
6097 kthread_stop(thread->tsk);
6101 void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
6108 if (!rdev || test_bit(Faulty, &rdev->flags))
6111 if (mddev->external)
6112 set_bit(Blocked, &rdev->flags);
6114 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
6116 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
6117 __builtin_return_address(0),__builtin_return_address(1),
6118 __builtin_return_address(2),__builtin_return_address(3));
6122 if (!mddev->pers->error_handler)
6124 mddev->pers->error_handler(mddev,rdev);
6125 if (mddev->degraded)
6126 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6127 sysfs_notify_dirent_safe(rdev->sysfs_state);
6128 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6129 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6130 md_wakeup_thread(mddev->thread);
6131 if (mddev->event_work.func)
6132 queue_work(md_misc_wq, &mddev->event_work);
6133 md_new_event_inintr(mddev);
6136 /* seq_file implementation /proc/mdstat */
6138 static void status_unused(struct seq_file *seq)
6143 seq_printf(seq, "unused devices: ");
6145 list_for_each_entry(rdev, &pending_raid_disks, same_set) {
6146 char b[BDEVNAME_SIZE];
6148 seq_printf(seq, "%s ",
6149 bdevname(rdev->bdev,b));
6152 seq_printf(seq, "<none>");
6154 seq_printf(seq, "\n");
6158 static void status_resync(struct seq_file *seq, mddev_t * mddev)
6160 sector_t max_sectors, resync, res;
6161 unsigned long dt, db;
6164 unsigned int per_milli;
6166 resync = mddev->curr_resync - atomic_read(&mddev->recovery_active);
6168 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
6169 max_sectors = mddev->resync_max_sectors;
6171 max_sectors = mddev->dev_sectors;
6174 * Should not happen.
6180 /* Pick 'scale' such that (resync>>scale)*1000 will fit
6181 * in a sector_t, and (max_sectors>>scale) will fit in a
6182 * u32, as those are the requirements for sector_div.
6183 * Thus 'scale' must be at least 10
6186 if (sizeof(sector_t) > sizeof(unsigned long)) {
6187 while ( max_sectors/2 > (1ULL<<(scale+32)))
6190 res = (resync>>scale)*1000;
6191 sector_div(res, (u32)((max_sectors>>scale)+1));
6195 int i, x = per_milli/50, y = 20-x;
6196 seq_printf(seq, "[");
6197 for (i = 0; i < x; i++)
6198 seq_printf(seq, "=");
6199 seq_printf(seq, ">");
6200 for (i = 0; i < y; i++)
6201 seq_printf(seq, ".");
6202 seq_printf(seq, "] ");
6204 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
6205 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
6207 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
6209 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
6210 "resync" : "recovery"))),
6211 per_milli/10, per_milli % 10,
6212 (unsigned long long) resync/2,
6213 (unsigned long long) max_sectors/2);
6216 * dt: time from mark until now
6217 * db: blocks written from mark until now
6218 * rt: remaining time
6220 * rt is a sector_t, so could be 32bit or 64bit.
6221 * So we divide before multiply in case it is 32bit and close
6223 * We scale the divisor (db) by 32 to avoid loosing precision
6224 * near the end of resync when the number of remaining sectors
6226 * We then divide rt by 32 after multiplying by db to compensate.
6227 * The '+1' avoids division by zero if db is very small.
6229 dt = ((jiffies - mddev->resync_mark) / HZ);
6231 db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active))
6232 - mddev->resync_mark_cnt;
6234 rt = max_sectors - resync; /* number of remaining sectors */
6235 sector_div(rt, db/32+1);
6239 seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60,
6240 ((unsigned long)rt % 60)/6);
6242 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
6245 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
6247 struct list_head *tmp;
6257 spin_lock(&all_mddevs_lock);
6258 list_for_each(tmp,&all_mddevs)
6260 mddev = list_entry(tmp, mddev_t, all_mddevs);
6262 spin_unlock(&all_mddevs_lock);
6265 spin_unlock(&all_mddevs_lock);
6267 return (void*)2;/* tail */
6271 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
6273 struct list_head *tmp;
6274 mddev_t *next_mddev, *mddev = v;
6280 spin_lock(&all_mddevs_lock);
6282 tmp = all_mddevs.next;
6284 tmp = mddev->all_mddevs.next;
6285 if (tmp != &all_mddevs)
6286 next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs));
6288 next_mddev = (void*)2;
6291 spin_unlock(&all_mddevs_lock);
6299 static void md_seq_stop(struct seq_file *seq, void *v)
6303 if (mddev && v != (void*)1 && v != (void*)2)
6307 struct mdstat_info {
6311 static int md_seq_show(struct seq_file *seq, void *v)
6316 struct mdstat_info *mi = seq->private;
6317 struct bitmap *bitmap;
6319 if (v == (void*)1) {
6320 struct mdk_personality *pers;
6321 seq_printf(seq, "Personalities : ");
6322 spin_lock(&pers_lock);
6323 list_for_each_entry(pers, &pers_list, list)
6324 seq_printf(seq, "[%s] ", pers->name);
6326 spin_unlock(&pers_lock);
6327 seq_printf(seq, "\n");
6328 mi->event = atomic_read(&md_event_count);
6331 if (v == (void*)2) {
6336 if (mddev_lock(mddev) < 0)
6339 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
6340 seq_printf(seq, "%s : %sactive", mdname(mddev),
6341 mddev->pers ? "" : "in");
6344 seq_printf(seq, " (read-only)");
6346 seq_printf(seq, " (auto-read-only)");
6347 seq_printf(seq, " %s", mddev->pers->name);
6351 list_for_each_entry(rdev, &mddev->disks, same_set) {
6352 char b[BDEVNAME_SIZE];
6353 seq_printf(seq, " %s[%d]",
6354 bdevname(rdev->bdev,b), rdev->desc_nr);
6355 if (test_bit(WriteMostly, &rdev->flags))
6356 seq_printf(seq, "(W)");
6357 if (test_bit(Faulty, &rdev->flags)) {
6358 seq_printf(seq, "(F)");
6360 } else if (rdev->raid_disk < 0)
6361 seq_printf(seq, "(S)"); /* spare */
6362 sectors += rdev->sectors;
6365 if (!list_empty(&mddev->disks)) {
6367 seq_printf(seq, "\n %llu blocks",
6368 (unsigned long long)
6369 mddev->array_sectors / 2);
6371 seq_printf(seq, "\n %llu blocks",
6372 (unsigned long long)sectors / 2);
6374 if (mddev->persistent) {
6375 if (mddev->major_version != 0 ||
6376 mddev->minor_version != 90) {
6377 seq_printf(seq," super %d.%d",
6378 mddev->major_version,
6379 mddev->minor_version);
6381 } else if (mddev->external)
6382 seq_printf(seq, " super external:%s",
6383 mddev->metadata_type);
6385 seq_printf(seq, " super non-persistent");
6388 mddev->pers->status(seq, mddev);
6389 seq_printf(seq, "\n ");
6390 if (mddev->pers->sync_request) {
6391 if (mddev->curr_resync > 2) {
6392 status_resync(seq, mddev);
6393 seq_printf(seq, "\n ");
6394 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
6395 seq_printf(seq, "\tresync=DELAYED\n ");
6396 else if (mddev->recovery_cp < MaxSector)
6397 seq_printf(seq, "\tresync=PENDING\n ");
6400 seq_printf(seq, "\n ");
6402 if ((bitmap = mddev->bitmap)) {
6403 unsigned long chunk_kb;
6404 unsigned long flags;
6405 spin_lock_irqsave(&bitmap->lock, flags);
6406 chunk_kb = mddev->bitmap_info.chunksize >> 10;
6407 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
6409 bitmap->pages - bitmap->missing_pages,
6411 (bitmap->pages - bitmap->missing_pages)
6412 << (PAGE_SHIFT - 10),
6413 chunk_kb ? chunk_kb : mddev->bitmap_info.chunksize,
6414 chunk_kb ? "KB" : "B");
6416 seq_printf(seq, ", file: ");
6417 seq_path(seq, &bitmap->file->f_path, " \t\n");
6420 seq_printf(seq, "\n");
6421 spin_unlock_irqrestore(&bitmap->lock, flags);
6424 seq_printf(seq, "\n");
6426 mddev_unlock(mddev);
6431 static const struct seq_operations md_seq_ops = {
6432 .start = md_seq_start,
6433 .next = md_seq_next,
6434 .stop = md_seq_stop,
6435 .show = md_seq_show,
6438 static int md_seq_open(struct inode *inode, struct file *file)
6441 struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL);
6445 error = seq_open(file, &md_seq_ops);
6449 struct seq_file *p = file->private_data;
6451 mi->event = atomic_read(&md_event_count);
6456 static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
6458 struct seq_file *m = filp->private_data;
6459 struct mdstat_info *mi = m->private;
6462 poll_wait(filp, &md_event_waiters, wait);
6464 /* always allow read */
6465 mask = POLLIN | POLLRDNORM;
6467 if (mi->event != atomic_read(&md_event_count))
6468 mask |= POLLERR | POLLPRI;
6472 static const struct file_operations md_seq_fops = {
6473 .owner = THIS_MODULE,
6474 .open = md_seq_open,
6476 .llseek = seq_lseek,
6477 .release = seq_release_private,
6478 .poll = mdstat_poll,
6481 int register_md_personality(struct mdk_personality *p)
6483 spin_lock(&pers_lock);
6484 list_add_tail(&p->list, &pers_list);
6485 printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level);
6486 spin_unlock(&pers_lock);
6490 int unregister_md_personality(struct mdk_personality *p)
6492 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
6493 spin_lock(&pers_lock);
6494 list_del_init(&p->list);
6495 spin_unlock(&pers_lock);
6499 static int is_mddev_idle(mddev_t *mddev, int init)
6507 rdev_for_each_rcu(rdev, mddev) {
6508 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
6509 curr_events = (int)part_stat_read(&disk->part0, sectors[0]) +
6510 (int)part_stat_read(&disk->part0, sectors[1]) -
6511 atomic_read(&disk->sync_io);
6512 /* sync IO will cause sync_io to increase before the disk_stats
6513 * as sync_io is counted when a request starts, and
6514 * disk_stats is counted when it completes.
6515 * So resync activity will cause curr_events to be smaller than
6516 * when there was no such activity.
6517 * non-sync IO will cause disk_stat to increase without
6518 * increasing sync_io so curr_events will (eventually)
6519 * be larger than it was before. Once it becomes
6520 * substantially larger, the test below will cause
6521 * the array to appear non-idle, and resync will slow
6523 * If there is a lot of outstanding resync activity when
6524 * we set last_event to curr_events, then all that activity
6525 * completing might cause the array to appear non-idle
6526 * and resync will be slowed down even though there might
6527 * not have been non-resync activity. This will only
6528 * happen once though. 'last_events' will soon reflect
6529 * the state where there is little or no outstanding
6530 * resync requests, and further resync activity will
6531 * always make curr_events less than last_events.
6534 if (init || curr_events - rdev->last_events > 64) {
6535 rdev->last_events = curr_events;
6543 void md_done_sync(mddev_t *mddev, int blocks, int ok)
6545 /* another "blocks" (512byte) blocks have been synced */
6546 atomic_sub(blocks, &mddev->recovery_active);
6547 wake_up(&mddev->recovery_wait);
6549 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6550 md_wakeup_thread(mddev->thread);
6551 // stop recovery, signal do_sync ....
6556 /* md_write_start(mddev, bi)
6557 * If we need to update some array metadata (e.g. 'active' flag
6558 * in superblock) before writing, schedule a superblock update
6559 * and wait for it to complete.
6561 void md_write_start(mddev_t *mddev, struct bio *bi)
6564 if (bio_data_dir(bi) != WRITE)
6567 BUG_ON(mddev->ro == 1);
6568 if (mddev->ro == 2) {
6569 /* need to switch to read/write */
6571 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6572 md_wakeup_thread(mddev->thread);
6573 md_wakeup_thread(mddev->sync_thread);
6576 atomic_inc(&mddev->writes_pending);
6577 if (mddev->safemode == 1)
6578 mddev->safemode = 0;
6579 if (mddev->in_sync) {
6580 spin_lock_irq(&mddev->write_lock);
6581 if (mddev->in_sync) {
6583 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6584 set_bit(MD_CHANGE_PENDING, &mddev->flags);
6585 md_wakeup_thread(mddev->thread);
6588 spin_unlock_irq(&mddev->write_lock);
6591 sysfs_notify_dirent_safe(mddev->sysfs_state);
6592 wait_event(mddev->sb_wait,
6593 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
6596 void md_write_end(mddev_t *mddev)
6598 if (atomic_dec_and_test(&mddev->writes_pending)) {
6599 if (mddev->safemode == 2)
6600 md_wakeup_thread(mddev->thread);
6601 else if (mddev->safemode_delay)
6602 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
6606 /* md_allow_write(mddev)
6607 * Calling this ensures that the array is marked 'active' so that writes
6608 * may proceed without blocking. It is important to call this before
6609 * attempting a GFP_KERNEL allocation while holding the mddev lock.
6610 * Must be called with mddev_lock held.
6612 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
6613 * is dropped, so return -EAGAIN after notifying userspace.
6615 int md_allow_write(mddev_t *mddev)
6621 if (!mddev->pers->sync_request)
6624 spin_lock_irq(&mddev->write_lock);
6625 if (mddev->in_sync) {
6627 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6628 set_bit(MD_CHANGE_PENDING, &mddev->flags);
6629 if (mddev->safemode_delay &&
6630 mddev->safemode == 0)
6631 mddev->safemode = 1;
6632 spin_unlock_irq(&mddev->write_lock);
6633 md_update_sb(mddev, 0);
6634 sysfs_notify_dirent_safe(mddev->sysfs_state);
6636 spin_unlock_irq(&mddev->write_lock);
6638 if (test_bit(MD_CHANGE_PENDING, &mddev->flags))
6643 EXPORT_SYMBOL_GPL(md_allow_write);
6645 void md_unplug(mddev_t *mddev)
6648 blk_unplug(mddev->queue);
6650 mddev->plug->unplug_fn(mddev->plug);
6653 #define SYNC_MARKS 10
6654 #define SYNC_MARK_STEP (3*HZ)
6655 void md_do_sync(mddev_t *mddev)
6658 unsigned int currspeed = 0,
6660 sector_t max_sectors,j, io_sectors;
6661 unsigned long mark[SYNC_MARKS];
6662 sector_t mark_cnt[SYNC_MARKS];
6664 struct list_head *tmp;
6665 sector_t last_check;
6670 /* just incase thread restarts... */
6671 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
6673 if (mddev->ro) /* never try to sync a read-only array */
6676 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
6677 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
6678 desc = "data-check";
6679 else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
6680 desc = "requested-resync";
6683 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
6688 /* we overload curr_resync somewhat here.
6689 * 0 == not engaged in resync at all
6690 * 2 == checking that there is no conflict with another sync
6691 * 1 == like 2, but have yielded to allow conflicting resync to
6693 * other == active in resync - this many blocks
6695 * Before starting a resync we must have set curr_resync to
6696 * 2, and then checked that every "conflicting" array has curr_resync
6697 * less than ours. When we find one that is the same or higher
6698 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
6699 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
6700 * This will mean we have to start checking from the beginning again.
6705 mddev->curr_resync = 2;
6708 if (kthread_should_stop())
6709 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6711 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
6713 for_each_mddev(mddev2, tmp) {
6714 if (mddev2 == mddev)
6716 if (!mddev->parallel_resync
6717 && mddev2->curr_resync
6718 && match_mddev_units(mddev, mddev2)) {
6720 if (mddev < mddev2 && mddev->curr_resync == 2) {
6721 /* arbitrarily yield */
6722 mddev->curr_resync = 1;
6723 wake_up(&resync_wait);
6725 if (mddev > mddev2 && mddev->curr_resync == 1)
6726 /* no need to wait here, we can wait the next
6727 * time 'round when curr_resync == 2
6730 /* We need to wait 'interruptible' so as not to
6731 * contribute to the load average, and not to
6732 * be caught by 'softlockup'
6734 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
6735 if (!kthread_should_stop() &&
6736 mddev2->curr_resync >= mddev->curr_resync) {
6737 printk(KERN_INFO "md: delaying %s of %s"
6738 " until %s has finished (they"
6739 " share one or more physical units)\n",
6740 desc, mdname(mddev), mdname(mddev2));
6742 if (signal_pending(current))
6743 flush_signals(current);
6745 finish_wait(&resync_wait, &wq);
6748 finish_wait(&resync_wait, &wq);
6751 } while (mddev->curr_resync < 2);
6754 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
6755 /* resync follows the size requested by the personality,
6756 * which defaults to physical size, but can be virtual size
6758 max_sectors = mddev->resync_max_sectors;
6759 mddev->resync_mismatches = 0;
6760 /* we don't use the checkpoint if there's a bitmap */
6761 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
6762 j = mddev->resync_min;
6763 else if (!mddev->bitmap)
6764 j = mddev->recovery_cp;
6766 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
6767 max_sectors = mddev->dev_sectors;
6769 /* recovery follows the physical size of devices */
6770 max_sectors = mddev->dev_sectors;
6773 list_for_each_entry_rcu(rdev, &mddev->disks, same_set)
6774 if (rdev->raid_disk >= 0 &&
6775 !test_bit(Faulty, &rdev->flags) &&
6776 !test_bit(In_sync, &rdev->flags) &&
6777 rdev->recovery_offset < j)
6778 j = rdev->recovery_offset;
6782 printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev));
6783 printk(KERN_INFO "md: minimum _guaranteed_ speed:"
6784 " %d KB/sec/disk.\n", speed_min(mddev));
6785 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
6786 "(but not more than %d KB/sec) for %s.\n",
6787 speed_max(mddev), desc);
6789 is_mddev_idle(mddev, 1); /* this initializes IO event counters */
6792 for (m = 0; m < SYNC_MARKS; m++) {
6794 mark_cnt[m] = io_sectors;
6797 mddev->resync_mark = mark[last_mark];
6798 mddev->resync_mark_cnt = mark_cnt[last_mark];
6801 * Tune reconstruction:
6803 window = 32*(PAGE_SIZE/512);
6804 printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n",
6805 window/2,(unsigned long long) max_sectors/2);
6807 atomic_set(&mddev->recovery_active, 0);
6812 "md: resuming %s of %s from checkpoint.\n",
6813 desc, mdname(mddev));
6814 mddev->curr_resync = j;
6816 mddev->curr_resync_completed = mddev->curr_resync;
6818 while (j < max_sectors) {
6823 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
6824 ((mddev->curr_resync > mddev->curr_resync_completed &&
6825 (mddev->curr_resync - mddev->curr_resync_completed)
6826 > (max_sectors >> 4)) ||
6827 (j - mddev->curr_resync_completed)*2
6828 >= mddev->resync_max - mddev->curr_resync_completed
6830 /* time to update curr_resync_completed */
6832 wait_event(mddev->recovery_wait,
6833 atomic_read(&mddev->recovery_active) == 0);
6834 mddev->curr_resync_completed =
6836 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6837 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
6840 while (j >= mddev->resync_max && !kthread_should_stop()) {
6841 /* As this condition is controlled by user-space,
6842 * we can block indefinitely, so use '_interruptible'
6843 * to avoid triggering warnings.
6845 flush_signals(current); /* just in case */
6846 wait_event_interruptible(mddev->recovery_wait,
6847 mddev->resync_max > j
6848 || kthread_should_stop());
6851 if (kthread_should_stop())
6854 sectors = mddev->pers->sync_request(mddev, j, &skipped,
6855 currspeed < speed_min(mddev));
6857 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6861 if (!skipped) { /* actual IO requested */
6862 io_sectors += sectors;
6863 atomic_add(sectors, &mddev->recovery_active);
6867 if (j>1) mddev->curr_resync = j;
6868 mddev->curr_mark_cnt = io_sectors;
6869 if (last_check == 0)
6870 /* this is the earliers that rebuilt will be
6871 * visible in /proc/mdstat
6873 md_new_event(mddev);
6875 if (last_check + window > io_sectors || j == max_sectors)
6878 last_check = io_sectors;
6880 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
6884 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
6886 int next = (last_mark+1) % SYNC_MARKS;
6888 mddev->resync_mark = mark[next];
6889 mddev->resync_mark_cnt = mark_cnt[next];
6890 mark[next] = jiffies;
6891 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
6896 if (kthread_should_stop())
6901 * this loop exits only if either when we are slower than
6902 * the 'hard' speed limit, or the system was IO-idle for
6904 * the system might be non-idle CPU-wise, but we only care
6905 * about not overloading the IO subsystem. (things like an
6906 * e2fsck being done on the RAID array should execute fast)
6911 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
6912 /((jiffies-mddev->resync_mark)/HZ +1) +1;
6914 if (currspeed > speed_min(mddev)) {
6915 if ((currspeed > speed_max(mddev)) ||
6916 !is_mddev_idle(mddev, 0)) {
6922 printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc);
6924 * this also signals 'finished resyncing' to md_stop
6929 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
6931 /* tell personality that we are finished */
6932 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
6934 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
6935 mddev->curr_resync > 2) {
6936 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
6937 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
6938 if (mddev->curr_resync >= mddev->recovery_cp) {
6940 "md: checkpointing %s of %s.\n",
6941 desc, mdname(mddev));
6942 mddev->recovery_cp = mddev->curr_resync;
6945 mddev->recovery_cp = MaxSector;
6947 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
6948 mddev->curr_resync = MaxSector;
6950 list_for_each_entry_rcu(rdev, &mddev->disks, same_set)
6951 if (rdev->raid_disk >= 0 &&
6952 mddev->delta_disks >= 0 &&
6953 !test_bit(Faulty, &rdev->flags) &&
6954 !test_bit(In_sync, &rdev->flags) &&
6955 rdev->recovery_offset < mddev->curr_resync)
6956 rdev->recovery_offset = mddev->curr_resync;
6960 set_bit(MD_CHANGE_DEVS, &mddev->flags);
6963 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
6964 /* We completed so min/max setting can be forgotten if used. */
6965 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
6966 mddev->resync_min = 0;
6967 mddev->resync_max = MaxSector;
6968 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
6969 mddev->resync_min = mddev->curr_resync_completed;
6970 mddev->curr_resync = 0;
6971 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
6972 mddev->curr_resync_completed = 0;
6973 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
6974 wake_up(&resync_wait);
6975 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
6976 md_wakeup_thread(mddev->thread);
6981 * got a signal, exit.
6984 "md: md_do_sync() got signal ... exiting\n");
6985 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6989 EXPORT_SYMBOL_GPL(md_do_sync);
6992 static int remove_and_add_spares(mddev_t *mddev)
6997 mddev->curr_resync_completed = 0;
6999 list_for_each_entry(rdev, &mddev->disks, same_set)
7000 if (rdev->raid_disk >= 0 &&
7001 !test_bit(Blocked, &rdev->flags) &&
7002 (test_bit(Faulty, &rdev->flags) ||
7003 ! test_bit(In_sync, &rdev->flags)) &&
7004 atomic_read(&rdev->nr_pending)==0) {
7005 if (mddev->pers->hot_remove_disk(
7006 mddev, rdev->raid_disk)==0) {
7008 sprintf(nm,"rd%d", rdev->raid_disk);
7009 sysfs_remove_link(&mddev->kobj, nm);
7010 rdev->raid_disk = -1;
7014 if (mddev->degraded && ! mddev->ro && !mddev->recovery_disabled) {
7015 list_for_each_entry(rdev, &mddev->disks, same_set) {
7016 if (rdev->raid_disk >= 0 &&
7017 !test_bit(In_sync, &rdev->flags) &&
7018 !test_bit(Blocked, &rdev->flags))
7020 if (rdev->raid_disk < 0
7021 && !test_bit(Faulty, &rdev->flags)) {
7022 rdev->recovery_offset = 0;
7024 hot_add_disk(mddev, rdev) == 0) {
7026 sprintf(nm, "rd%d", rdev->raid_disk);
7027 if (sysfs_create_link(&mddev->kobj,
7029 /* failure here is OK */;
7031 md_new_event(mddev);
7032 set_bit(MD_CHANGE_DEVS, &mddev->flags);
7041 * This routine is regularly called by all per-raid-array threads to
7042 * deal with generic issues like resync and super-block update.
7043 * Raid personalities that don't have a thread (linear/raid0) do not
7044 * need this as they never do any recovery or update the superblock.
7046 * It does not do any resync itself, but rather "forks" off other threads
7047 * to do that as needed.
7048 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
7049 * "->recovery" and create a thread at ->sync_thread.
7050 * When the thread finishes it sets MD_RECOVERY_DONE
7051 * and wakeups up this thread which will reap the thread and finish up.
7052 * This thread also removes any faulty devices (with nr_pending == 0).
7054 * The overall approach is:
7055 * 1/ if the superblock needs updating, update it.
7056 * 2/ If a recovery thread is running, don't do anything else.
7057 * 3/ If recovery has finished, clean up, possibly marking spares active.
7058 * 4/ If there are any faulty devices, remove them.
7059 * 5/ If array is degraded, try to add spares devices
7060 * 6/ If array has spares or is not in-sync, start a resync thread.
7062 void md_check_recovery(mddev_t *mddev)
7068 bitmap_daemon_work(mddev);
7073 if (signal_pending(current)) {
7074 if (mddev->pers->sync_request && !mddev->external) {
7075 printk(KERN_INFO "md: %s in immediate safe mode\n",
7077 mddev->safemode = 2;
7079 flush_signals(current);
7082 if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
7085 (mddev->flags & ~ (1<<MD_CHANGE_PENDING)) ||
7086 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
7087 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
7088 (mddev->external == 0 && mddev->safemode == 1) ||
7089 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
7090 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
7094 if (mddev_trylock(mddev)) {
7098 /* Only thing we do on a ro array is remove
7101 remove_and_add_spares(mddev);
7102 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7106 if (!mddev->external) {
7108 spin_lock_irq(&mddev->write_lock);
7109 if (mddev->safemode &&
7110 !atomic_read(&mddev->writes_pending) &&
7112 mddev->recovery_cp == MaxSector) {
7115 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
7117 if (mddev->safemode == 1)
7118 mddev->safemode = 0;
7119 spin_unlock_irq(&mddev->write_lock);
7121 sysfs_notify_dirent_safe(mddev->sysfs_state);
7125 md_update_sb(mddev, 0);
7127 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
7128 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
7129 /* resync/recovery still happening */
7130 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7133 if (mddev->sync_thread) {
7134 /* resync has finished, collect result */
7135 md_unregister_thread(mddev->sync_thread);
7136 mddev->sync_thread = NULL;
7137 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
7138 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
7140 /* activate any spares */
7141 if (mddev->pers->spare_active(mddev))
7142 sysfs_notify(&mddev->kobj, NULL,
7145 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
7146 mddev->pers->finish_reshape)
7147 mddev->pers->finish_reshape(mddev);
7148 md_update_sb(mddev, 1);
7150 /* if array is no-longer degraded, then any saved_raid_disk
7151 * information must be scrapped
7153 if (!mddev->degraded)
7154 list_for_each_entry(rdev, &mddev->disks, same_set)
7155 rdev->saved_raid_disk = -1;
7157 mddev->recovery = 0;
7158 /* flag recovery needed just to double check */
7159 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7160 sysfs_notify_dirent_safe(mddev->sysfs_action);
7161 md_new_event(mddev);
7164 /* Set RUNNING before clearing NEEDED to avoid
7165 * any transients in the value of "sync_action".
7167 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7168 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7169 /* Clear some bits that don't mean anything, but
7172 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
7173 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
7175 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
7177 /* no recovery is running.
7178 * remove any failed drives, then
7179 * add spares if possible.
7180 * Spare are also removed and re-added, to allow
7181 * the personality to fail the re-add.
7184 if (mddev->reshape_position != MaxSector) {
7185 if (mddev->pers->check_reshape == NULL ||
7186 mddev->pers->check_reshape(mddev) != 0)
7187 /* Cannot proceed */
7189 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
7190 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7191 } else if ((spares = remove_and_add_spares(mddev))) {
7192 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7193 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
7194 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
7195 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7196 } else if (mddev->recovery_cp < MaxSector) {
7197 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7198 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7199 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
7200 /* nothing to be done ... */
7203 if (mddev->pers->sync_request) {
7204 if (spares && mddev->bitmap && ! mddev->bitmap->file) {
7205 /* We are adding a device or devices to an array
7206 * which has the bitmap stored on all devices.
7207 * So make sure all bitmap pages get written
7209 bitmap_write_all(mddev->bitmap);
7211 mddev->sync_thread = md_register_thread(md_do_sync,
7214 if (!mddev->sync_thread) {
7215 printk(KERN_ERR "%s: could not start resync"
7218 /* leave the spares where they are, it shouldn't hurt */
7219 mddev->recovery = 0;
7221 md_wakeup_thread(mddev->sync_thread);
7222 sysfs_notify_dirent_safe(mddev->sysfs_action);
7223 md_new_event(mddev);
7226 if (!mddev->sync_thread) {
7227 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7228 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
7230 if (mddev->sysfs_action)
7231 sysfs_notify_dirent_safe(mddev->sysfs_action);
7233 mddev_unlock(mddev);
7237 void md_wait_for_blocked_rdev(mdk_rdev_t *rdev, mddev_t *mddev)
7239 sysfs_notify_dirent_safe(rdev->sysfs_state);
7240 wait_event_timeout(rdev->blocked_wait,
7241 !test_bit(Blocked, &rdev->flags),
7242 msecs_to_jiffies(5000));
7243 rdev_dec_pending(rdev, mddev);
7245 EXPORT_SYMBOL(md_wait_for_blocked_rdev);
7247 static int md_notify_reboot(struct notifier_block *this,
7248 unsigned long code, void *x)
7250 struct list_head *tmp;
7253 if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) {
7255 printk(KERN_INFO "md: stopping all md devices.\n");
7257 for_each_mddev(mddev, tmp)
7258 if (mddev_trylock(mddev)) {
7259 /* Force a switch to readonly even array
7260 * appears to still be in use. Hence
7263 md_set_readonly(mddev, 100);
7264 mddev_unlock(mddev);
7267 * certain more exotic SCSI devices are known to be
7268 * volatile wrt too early system reboots. While the
7269 * right place to handle this issue is the given
7270 * driver, we do want to have a safe RAID driver ...
7277 static struct notifier_block md_notifier = {
7278 .notifier_call = md_notify_reboot,
7280 .priority = INT_MAX, /* before any real devices */
7283 static void md_geninit(void)
7285 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
7287 proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops);
7290 static int __init md_init(void)
7294 md_wq = alloc_workqueue("md", WQ_RESCUER, 0);
7298 md_misc_wq = alloc_workqueue("md_misc", 0, 0);
7302 if ((ret = register_blkdev(MD_MAJOR, "md")) < 0)
7305 if ((ret = register_blkdev(0, "mdp")) < 0)
7309 blk_register_region(MKDEV(MD_MAJOR, 0), 1UL<<MINORBITS, THIS_MODULE,
7310 md_probe, NULL, NULL);
7311 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
7312 md_probe, NULL, NULL);
7314 register_reboot_notifier(&md_notifier);
7315 raid_table_header = register_sysctl_table(raid_root_table);
7321 unregister_blkdev(MD_MAJOR, "md");
7323 destroy_workqueue(md_misc_wq);
7325 destroy_workqueue(md_wq);
7333 * Searches all registered partitions for autorun RAID arrays
7337 static LIST_HEAD(all_detected_devices);
7338 struct detected_devices_node {
7339 struct list_head list;
7343 void md_autodetect_dev(dev_t dev)
7345 struct detected_devices_node *node_detected_dev;
7347 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
7348 if (node_detected_dev) {
7349 node_detected_dev->dev = dev;
7350 list_add_tail(&node_detected_dev->list, &all_detected_devices);
7352 printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed"
7353 ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev));
7358 static void autostart_arrays(int part)
7361 struct detected_devices_node *node_detected_dev;
7363 int i_scanned, i_passed;
7368 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
7370 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
7372 node_detected_dev = list_entry(all_detected_devices.next,
7373 struct detected_devices_node, list);
7374 list_del(&node_detected_dev->list);
7375 dev = node_detected_dev->dev;
7376 kfree(node_detected_dev);
7377 rdev = md_import_device(dev,0, 90);
7381 if (test_bit(Faulty, &rdev->flags)) {
7385 set_bit(AutoDetected, &rdev->flags);
7386 list_add(&rdev->same_set, &pending_raid_disks);
7390 printk(KERN_INFO "md: Scanned %d and added %d devices.\n",
7391 i_scanned, i_passed);
7393 autorun_devices(part);
7396 #endif /* !MODULE */
7398 static __exit void md_exit(void)
7401 struct list_head *tmp;
7403 blk_unregister_region(MKDEV(MD_MAJOR,0), 1U << MINORBITS);
7404 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
7406 unregister_blkdev(MD_MAJOR,"md");
7407 unregister_blkdev(mdp_major, "mdp");
7408 unregister_reboot_notifier(&md_notifier);
7409 unregister_sysctl_table(raid_table_header);
7410 remove_proc_entry("mdstat", NULL);
7411 for_each_mddev(mddev, tmp) {
7412 export_array(mddev);
7413 mddev->hold_active = 0;
7415 destroy_workqueue(md_misc_wq);
7416 destroy_workqueue(md_wq);
7419 subsys_initcall(md_init);
7420 module_exit(md_exit)
7422 static int get_ro(char *buffer, struct kernel_param *kp)
7424 return sprintf(buffer, "%d", start_readonly);
7426 static int set_ro(const char *val, struct kernel_param *kp)
7429 int num = simple_strtoul(val, &e, 10);
7430 if (*val && (*e == '\0' || *e == '\n')) {
7431 start_readonly = num;
7437 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
7438 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
7440 module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR);
7442 EXPORT_SYMBOL(register_md_personality);
7443 EXPORT_SYMBOL(unregister_md_personality);
7444 EXPORT_SYMBOL(md_error);
7445 EXPORT_SYMBOL(md_done_sync);
7446 EXPORT_SYMBOL(md_write_start);
7447 EXPORT_SYMBOL(md_write_end);
7448 EXPORT_SYMBOL(md_register_thread);
7449 EXPORT_SYMBOL(md_unregister_thread);
7450 EXPORT_SYMBOL(md_wakeup_thread);
7451 EXPORT_SYMBOL(md_check_recovery);
7452 MODULE_LICENSE("GPL");
7453 MODULE_DESCRIPTION("MD RAID framework");
7455 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);