2 md.c : Multiple Devices driver for Linux
3 Copyright (C) 1998, 1999, 2000 Ingo Molnar
5 completely rewritten, based on the MD driver code from Marc Zyngier
9 - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar
10 - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com>
11 - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net>
12 - kerneld support by Boris Tobotras <boris@xtalk.msk.su>
13 - kmod support by: Cyrus Durgin
14 - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com>
15 - Devfs support by Richard Gooch <rgooch@atnf.csiro.au>
17 - lots of fixes and improvements to the RAID1/RAID5 and generic
18 RAID code (such as request based resynchronization):
20 Neil Brown <neilb@cse.unsw.edu.au>.
22 - persistent bitmap code
23 Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.
25 This program is free software; you can redistribute it and/or modify
26 it under the terms of the GNU General Public License as published by
27 the Free Software Foundation; either version 2, or (at your option)
30 You should have received a copy of the GNU General Public License
31 (for example /usr/src/linux/COPYING); if not, write to the Free
32 Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
35 #include <linux/kthread.h>
36 #include <linux/blkdev.h>
37 #include <linux/sysctl.h>
38 #include <linux/seq_file.h>
39 #include <linux/mutex.h>
40 #include <linux/buffer_head.h> /* for invalidate_bdev */
41 #include <linux/poll.h>
42 #include <linux/ctype.h>
43 #include <linux/string.h>
44 #include <linux/hdreg.h>
45 #include <linux/proc_fs.h>
46 #include <linux/random.h>
47 #include <linux/reboot.h>
48 #include <linux/file.h>
49 #include <linux/compat.h>
50 #include <linux/delay.h>
51 #include <linux/raid/md_p.h>
52 #include <linux/raid/md_u.h>
53 #include <linux/slab.h>
58 #define dprintk(x...) ((void)(DEBUG && printk(x)))
61 static void autostart_arrays(int part);
64 static LIST_HEAD(pers_list);
65 static DEFINE_SPINLOCK(pers_lock);
67 static void md_print_devices(void);
69 static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
70 static struct workqueue_struct *md_wq;
71 static struct workqueue_struct *md_misc_wq;
73 #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
76 * Default number of read corrections we'll attempt on an rdev
77 * before ejecting it from the array. We divide the read error
78 * count by 2 for every hour elapsed between read errors.
80 #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
82 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
83 * is 1000 KB/sec, so the extra system load does not show up that much.
84 * Increase it if you want to have more _guaranteed_ speed. Note that
85 * the RAID driver will use the maximum available bandwidth if the IO
86 * subsystem is idle. There is also an 'absolute maximum' reconstruction
87 * speed limit - in case reconstruction slows down your system despite
90 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
91 * or /sys/block/mdX/md/sync_speed_{min,max}
94 static int sysctl_speed_limit_min = 1000;
95 static int sysctl_speed_limit_max = 200000;
96 static inline int speed_min(mddev_t *mddev)
98 return mddev->sync_speed_min ?
99 mddev->sync_speed_min : sysctl_speed_limit_min;
102 static inline int speed_max(mddev_t *mddev)
104 return mddev->sync_speed_max ?
105 mddev->sync_speed_max : sysctl_speed_limit_max;
108 static struct ctl_table_header *raid_table_header;
110 static ctl_table raid_table[] = {
112 .procname = "speed_limit_min",
113 .data = &sysctl_speed_limit_min,
114 .maxlen = sizeof(int),
115 .mode = S_IRUGO|S_IWUSR,
116 .proc_handler = proc_dointvec,
119 .procname = "speed_limit_max",
120 .data = &sysctl_speed_limit_max,
121 .maxlen = sizeof(int),
122 .mode = S_IRUGO|S_IWUSR,
123 .proc_handler = proc_dointvec,
128 static ctl_table raid_dir_table[] = {
132 .mode = S_IRUGO|S_IXUGO,
138 static ctl_table raid_root_table[] = {
143 .child = raid_dir_table,
148 static const struct block_device_operations md_fops;
150 static int start_readonly;
153 * like bio_clone, but with a local bio set
156 static void mddev_bio_destructor(struct bio *bio)
158 mddev_t *mddev, **mddevp;
163 bio_free(bio, mddev->bio_set);
166 struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs,
172 if (!mddev || !mddev->bio_set)
173 return bio_alloc(gfp_mask, nr_iovecs);
175 b = bio_alloc_bioset(gfp_mask, nr_iovecs,
181 b->bi_destructor = mddev_bio_destructor;
184 EXPORT_SYMBOL_GPL(bio_alloc_mddev);
186 struct bio *bio_clone_mddev(struct bio *bio, gfp_t gfp_mask,
192 if (!mddev || !mddev->bio_set)
193 return bio_clone(bio, gfp_mask);
195 b = bio_alloc_bioset(gfp_mask, bio->bi_max_vecs,
201 b->bi_destructor = mddev_bio_destructor;
203 if (bio_integrity(bio)) {
206 ret = bio_integrity_clone(b, bio, gfp_mask, mddev->bio_set);
216 EXPORT_SYMBOL_GPL(bio_clone_mddev);
219 * We have a system wide 'event count' that is incremented
220 * on any 'interesting' event, and readers of /proc/mdstat
221 * can use 'poll' or 'select' to find out when the event
225 * start array, stop array, error, add device, remove device,
226 * start build, activate spare
228 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
229 static atomic_t md_event_count;
230 void md_new_event(mddev_t *mddev)
232 atomic_inc(&md_event_count);
233 wake_up(&md_event_waiters);
235 EXPORT_SYMBOL_GPL(md_new_event);
237 /* Alternate version that can be called from interrupts
238 * when calling sysfs_notify isn't needed.
240 static void md_new_event_inintr(mddev_t *mddev)
242 atomic_inc(&md_event_count);
243 wake_up(&md_event_waiters);
247 * Enables to iterate over all existing md arrays
248 * all_mddevs_lock protects this list.
250 static LIST_HEAD(all_mddevs);
251 static DEFINE_SPINLOCK(all_mddevs_lock);
255 * iterates through all used mddevs in the system.
256 * We take care to grab the all_mddevs_lock whenever navigating
257 * the list, and to always hold a refcount when unlocked.
258 * Any code which breaks out of this loop while own
259 * a reference to the current mddev and must mddev_put it.
261 #define for_each_mddev(mddev,tmp) \
263 for (({ spin_lock(&all_mddevs_lock); \
264 tmp = all_mddevs.next; \
266 ({ if (tmp != &all_mddevs) \
267 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
268 spin_unlock(&all_mddevs_lock); \
269 if (mddev) mddev_put(mddev); \
270 mddev = list_entry(tmp, mddev_t, all_mddevs); \
271 tmp != &all_mddevs;}); \
272 ({ spin_lock(&all_mddevs_lock); \
277 /* Rather than calling directly into the personality make_request function,
278 * IO requests come here first so that we can check if the device is
279 * being suspended pending a reconfiguration.
280 * We hold a refcount over the call to ->make_request. By the time that
281 * call has finished, the bio has been linked into some internal structure
282 * and so is visible to ->quiesce(), so we don't need the refcount any more.
284 static int md_make_request(struct request_queue *q, struct bio *bio)
286 const int rw = bio_data_dir(bio);
287 mddev_t *mddev = q->queuedata;
291 if (mddev == NULL || mddev->pers == NULL
296 smp_rmb(); /* Ensure implications of 'active' are visible */
298 if (mddev->suspended) {
301 prepare_to_wait(&mddev->sb_wait, &__wait,
302 TASK_UNINTERRUPTIBLE);
303 if (!mddev->suspended)
309 finish_wait(&mddev->sb_wait, &__wait);
311 atomic_inc(&mddev->active_io);
314 rv = mddev->pers->make_request(mddev, bio);
316 cpu = part_stat_lock();
317 part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]);
318 part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw],
322 if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended)
323 wake_up(&mddev->sb_wait);
328 /* mddev_suspend makes sure no new requests are submitted
329 * to the device, and that any requests that have been submitted
330 * are completely handled.
331 * Once ->stop is called and completes, the module will be completely
334 void mddev_suspend(mddev_t *mddev)
336 BUG_ON(mddev->suspended);
337 mddev->suspended = 1;
339 wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0);
340 mddev->pers->quiesce(mddev, 1);
342 EXPORT_SYMBOL_GPL(mddev_suspend);
344 void mddev_resume(mddev_t *mddev)
346 mddev->suspended = 0;
347 wake_up(&mddev->sb_wait);
348 mddev->pers->quiesce(mddev, 0);
350 EXPORT_SYMBOL_GPL(mddev_resume);
352 int mddev_congested(mddev_t *mddev, int bits)
354 return mddev->suspended;
356 EXPORT_SYMBOL(mddev_congested);
359 * Generic flush handling for md
362 static void md_end_flush(struct bio *bio, int err)
364 mdk_rdev_t *rdev = bio->bi_private;
365 mddev_t *mddev = rdev->mddev;
367 rdev_dec_pending(rdev, mddev);
369 if (atomic_dec_and_test(&mddev->flush_pending)) {
370 /* The pre-request flush has finished */
371 queue_work(md_wq, &mddev->flush_work);
376 static void md_submit_flush_data(struct work_struct *ws);
378 static void submit_flushes(struct work_struct *ws)
380 mddev_t *mddev = container_of(ws, mddev_t, flush_work);
383 INIT_WORK(&mddev->flush_work, md_submit_flush_data);
384 atomic_set(&mddev->flush_pending, 1);
386 list_for_each_entry_rcu(rdev, &mddev->disks, same_set)
387 if (rdev->raid_disk >= 0 &&
388 !test_bit(Faulty, &rdev->flags)) {
389 /* Take two references, one is dropped
390 * when request finishes, one after
391 * we reclaim rcu_read_lock
394 atomic_inc(&rdev->nr_pending);
395 atomic_inc(&rdev->nr_pending);
397 bi = bio_alloc_mddev(GFP_KERNEL, 0, mddev);
398 bi->bi_end_io = md_end_flush;
399 bi->bi_private = rdev;
400 bi->bi_bdev = rdev->bdev;
401 atomic_inc(&mddev->flush_pending);
402 submit_bio(WRITE_FLUSH, bi);
404 rdev_dec_pending(rdev, mddev);
407 if (atomic_dec_and_test(&mddev->flush_pending))
408 queue_work(md_wq, &mddev->flush_work);
411 static void md_submit_flush_data(struct work_struct *ws)
413 mddev_t *mddev = container_of(ws, mddev_t, flush_work);
414 struct bio *bio = mddev->flush_bio;
416 if (bio->bi_size == 0)
417 /* an empty barrier - all done */
420 bio->bi_rw &= ~REQ_FLUSH;
421 if (mddev->pers->make_request(mddev, bio))
422 generic_make_request(bio);
425 mddev->flush_bio = NULL;
426 wake_up(&mddev->sb_wait);
429 void md_flush_request(mddev_t *mddev, struct bio *bio)
431 spin_lock_irq(&mddev->write_lock);
432 wait_event_lock_irq(mddev->sb_wait,
434 mddev->write_lock, /*nothing*/);
435 mddev->flush_bio = bio;
436 spin_unlock_irq(&mddev->write_lock);
438 INIT_WORK(&mddev->flush_work, submit_flushes);
439 queue_work(md_wq, &mddev->flush_work);
441 EXPORT_SYMBOL(md_flush_request);
443 /* Support for plugging.
444 * This mirrors the plugging support in request_queue, but does not
445 * require having a whole queue
447 static void plugger_work(struct work_struct *work)
449 struct plug_handle *plug =
450 container_of(work, struct plug_handle, unplug_work);
451 plug->unplug_fn(plug);
453 static void plugger_timeout(unsigned long data)
455 struct plug_handle *plug = (void *)data;
456 kblockd_schedule_work(NULL, &plug->unplug_work);
458 void plugger_init(struct plug_handle *plug,
459 void (*unplug_fn)(struct plug_handle *))
461 plug->unplug_flag = 0;
462 plug->unplug_fn = unplug_fn;
463 init_timer(&plug->unplug_timer);
464 plug->unplug_timer.function = plugger_timeout;
465 plug->unplug_timer.data = (unsigned long)plug;
466 INIT_WORK(&plug->unplug_work, plugger_work);
468 EXPORT_SYMBOL_GPL(plugger_init);
470 void plugger_set_plug(struct plug_handle *plug)
472 if (!test_and_set_bit(PLUGGED_FLAG, &plug->unplug_flag))
473 mod_timer(&plug->unplug_timer, jiffies + msecs_to_jiffies(3)+1);
475 EXPORT_SYMBOL_GPL(plugger_set_plug);
477 int plugger_remove_plug(struct plug_handle *plug)
479 if (test_and_clear_bit(PLUGGED_FLAG, &plug->unplug_flag)) {
480 del_timer(&plug->unplug_timer);
485 EXPORT_SYMBOL_GPL(plugger_remove_plug);
488 static inline mddev_t *mddev_get(mddev_t *mddev)
490 atomic_inc(&mddev->active);
494 static void mddev_delayed_delete(struct work_struct *ws);
496 static void mddev_put(mddev_t *mddev)
498 struct bio_set *bs = NULL;
500 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
502 if (!mddev->raid_disks && list_empty(&mddev->disks) &&
503 mddev->ctime == 0 && !mddev->hold_active) {
504 /* Array is not configured at all, and not held active,
506 list_del(&mddev->all_mddevs);
508 mddev->bio_set = NULL;
509 if (mddev->gendisk) {
510 /* We did a probe so need to clean up. Call
511 * queue_work inside the spinlock so that
512 * flush_workqueue() after mddev_find will
513 * succeed in waiting for the work to be done.
515 INIT_WORK(&mddev->del_work, mddev_delayed_delete);
516 queue_work(md_misc_wq, &mddev->del_work);
520 spin_unlock(&all_mddevs_lock);
525 void mddev_init(mddev_t *mddev)
527 mutex_init(&mddev->open_mutex);
528 mutex_init(&mddev->reconfig_mutex);
529 mutex_init(&mddev->bitmap_info.mutex);
530 INIT_LIST_HEAD(&mddev->disks);
531 INIT_LIST_HEAD(&mddev->all_mddevs);
532 init_timer(&mddev->safemode_timer);
533 atomic_set(&mddev->active, 1);
534 atomic_set(&mddev->openers, 0);
535 atomic_set(&mddev->active_io, 0);
536 spin_lock_init(&mddev->write_lock);
537 atomic_set(&mddev->flush_pending, 0);
538 init_waitqueue_head(&mddev->sb_wait);
539 init_waitqueue_head(&mddev->recovery_wait);
540 mddev->reshape_position = MaxSector;
541 mddev->resync_min = 0;
542 mddev->resync_max = MaxSector;
543 mddev->level = LEVEL_NONE;
545 EXPORT_SYMBOL_GPL(mddev_init);
547 static mddev_t * mddev_find(dev_t unit)
549 mddev_t *mddev, *new = NULL;
552 spin_lock(&all_mddevs_lock);
555 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
556 if (mddev->unit == unit) {
558 spin_unlock(&all_mddevs_lock);
564 list_add(&new->all_mddevs, &all_mddevs);
565 spin_unlock(&all_mddevs_lock);
566 new->hold_active = UNTIL_IOCTL;
570 /* find an unused unit number */
571 static int next_minor = 512;
572 int start = next_minor;
576 dev = MKDEV(MD_MAJOR, next_minor);
578 if (next_minor > MINORMASK)
580 if (next_minor == start) {
581 /* Oh dear, all in use. */
582 spin_unlock(&all_mddevs_lock);
588 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
589 if (mddev->unit == dev) {
595 new->md_minor = MINOR(dev);
596 new->hold_active = UNTIL_STOP;
597 list_add(&new->all_mddevs, &all_mddevs);
598 spin_unlock(&all_mddevs_lock);
601 spin_unlock(&all_mddevs_lock);
603 new = kzalloc(sizeof(*new), GFP_KERNEL);
608 if (MAJOR(unit) == MD_MAJOR)
609 new->md_minor = MINOR(unit);
611 new->md_minor = MINOR(unit) >> MdpMinorShift;
618 static inline int mddev_lock(mddev_t * mddev)
620 return mutex_lock_interruptible(&mddev->reconfig_mutex);
623 static inline int mddev_is_locked(mddev_t *mddev)
625 return mutex_is_locked(&mddev->reconfig_mutex);
628 static inline int mddev_trylock(mddev_t * mddev)
630 return mutex_trylock(&mddev->reconfig_mutex);
633 static struct attribute_group md_redundancy_group;
635 static void mddev_unlock(mddev_t * mddev)
637 if (mddev->to_remove) {
638 /* These cannot be removed under reconfig_mutex as
639 * an access to the files will try to take reconfig_mutex
640 * while holding the file unremovable, which leads to
642 * So hold set sysfs_active while the remove in happeing,
643 * and anything else which might set ->to_remove or my
644 * otherwise change the sysfs namespace will fail with
645 * -EBUSY if sysfs_active is still set.
646 * We set sysfs_active under reconfig_mutex and elsewhere
647 * test it under the same mutex to ensure its correct value
650 struct attribute_group *to_remove = mddev->to_remove;
651 mddev->to_remove = NULL;
652 mddev->sysfs_active = 1;
653 mutex_unlock(&mddev->reconfig_mutex);
655 if (mddev->kobj.sd) {
656 if (to_remove != &md_redundancy_group)
657 sysfs_remove_group(&mddev->kobj, to_remove);
658 if (mddev->pers == NULL ||
659 mddev->pers->sync_request == NULL) {
660 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
661 if (mddev->sysfs_action)
662 sysfs_put(mddev->sysfs_action);
663 mddev->sysfs_action = NULL;
666 mddev->sysfs_active = 0;
668 mutex_unlock(&mddev->reconfig_mutex);
670 md_wakeup_thread(mddev->thread);
673 static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr)
677 list_for_each_entry(rdev, &mddev->disks, same_set)
678 if (rdev->desc_nr == nr)
684 static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev)
688 list_for_each_entry(rdev, &mddev->disks, same_set)
689 if (rdev->bdev->bd_dev == dev)
695 static struct mdk_personality *find_pers(int level, char *clevel)
697 struct mdk_personality *pers;
698 list_for_each_entry(pers, &pers_list, list) {
699 if (level != LEVEL_NONE && pers->level == level)
701 if (strcmp(pers->name, clevel)==0)
707 /* return the offset of the super block in 512byte sectors */
708 static inline sector_t calc_dev_sboffset(mdk_rdev_t *rdev)
710 sector_t num_sectors = i_size_read(rdev->bdev->bd_inode) / 512;
711 return MD_NEW_SIZE_SECTORS(num_sectors);
714 static int alloc_disk_sb(mdk_rdev_t * rdev)
719 rdev->sb_page = alloc_page(GFP_KERNEL);
720 if (!rdev->sb_page) {
721 printk(KERN_ALERT "md: out of memory.\n");
728 static void free_disk_sb(mdk_rdev_t * rdev)
731 put_page(rdev->sb_page);
733 rdev->sb_page = NULL;
740 static void super_written(struct bio *bio, int error)
742 mdk_rdev_t *rdev = bio->bi_private;
743 mddev_t *mddev = rdev->mddev;
745 if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) {
746 printk("md: super_written gets error=%d, uptodate=%d\n",
747 error, test_bit(BIO_UPTODATE, &bio->bi_flags));
748 WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags));
749 md_error(mddev, rdev);
752 if (atomic_dec_and_test(&mddev->pending_writes))
753 wake_up(&mddev->sb_wait);
757 void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
758 sector_t sector, int size, struct page *page)
760 /* write first size bytes of page to sector of rdev
761 * Increment mddev->pending_writes before returning
762 * and decrement it on completion, waking up sb_wait
763 * if zero is reached.
764 * If an error occurred, call md_error
766 struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, mddev);
768 bio->bi_bdev = rdev->meta_bdev ? rdev->meta_bdev : rdev->bdev;
769 bio->bi_sector = sector;
770 bio_add_page(bio, page, size, 0);
771 bio->bi_private = rdev;
772 bio->bi_end_io = super_written;
774 atomic_inc(&mddev->pending_writes);
775 submit_bio(REQ_WRITE | REQ_SYNC | REQ_UNPLUG | REQ_FLUSH | REQ_FUA,
779 void md_super_wait(mddev_t *mddev)
781 /* wait for all superblock writes that were scheduled to complete */
784 prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE);
785 if (atomic_read(&mddev->pending_writes)==0)
789 finish_wait(&mddev->sb_wait, &wq);
792 static void bi_complete(struct bio *bio, int error)
794 complete((struct completion*)bio->bi_private);
797 int sync_page_io(mdk_rdev_t *rdev, sector_t sector, int size,
798 struct page *page, int rw, bool metadata_op)
800 struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, rdev->mddev);
801 struct completion event;
804 rw |= REQ_SYNC | REQ_UNPLUG;
806 bio->bi_bdev = (metadata_op && rdev->meta_bdev) ?
807 rdev->meta_bdev : rdev->bdev;
809 bio->bi_sector = sector + rdev->sb_start;
811 bio->bi_sector = sector + rdev->data_offset;
812 bio_add_page(bio, page, size, 0);
813 init_completion(&event);
814 bio->bi_private = &event;
815 bio->bi_end_io = bi_complete;
817 wait_for_completion(&event);
819 ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
823 EXPORT_SYMBOL_GPL(sync_page_io);
825 static int read_disk_sb(mdk_rdev_t * rdev, int size)
827 char b[BDEVNAME_SIZE];
828 if (!rdev->sb_page) {
836 if (!sync_page_io(rdev, 0, size, rdev->sb_page, READ, true))
842 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
843 bdevname(rdev->bdev,b));
847 static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
849 return sb1->set_uuid0 == sb2->set_uuid0 &&
850 sb1->set_uuid1 == sb2->set_uuid1 &&
851 sb1->set_uuid2 == sb2->set_uuid2 &&
852 sb1->set_uuid3 == sb2->set_uuid3;
855 static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
858 mdp_super_t *tmp1, *tmp2;
860 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
861 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
863 if (!tmp1 || !tmp2) {
865 printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n");
873 * nr_disks is not constant
878 ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0);
886 static u32 md_csum_fold(u32 csum)
888 csum = (csum & 0xffff) + (csum >> 16);
889 return (csum & 0xffff) + (csum >> 16);
892 static unsigned int calc_sb_csum(mdp_super_t * sb)
895 u32 *sb32 = (u32*)sb;
897 unsigned int disk_csum, csum;
899 disk_csum = sb->sb_csum;
902 for (i = 0; i < MD_SB_BYTES/4 ; i++)
904 csum = (newcsum & 0xffffffff) + (newcsum>>32);
908 /* This used to use csum_partial, which was wrong for several
909 * reasons including that different results are returned on
910 * different architectures. It isn't critical that we get exactly
911 * the same return value as before (we always csum_fold before
912 * testing, and that removes any differences). However as we
913 * know that csum_partial always returned a 16bit value on
914 * alphas, do a fold to maximise conformity to previous behaviour.
916 sb->sb_csum = md_csum_fold(disk_csum);
918 sb->sb_csum = disk_csum;
925 * Handle superblock details.
926 * We want to be able to handle multiple superblock formats
927 * so we have a common interface to them all, and an array of
928 * different handlers.
929 * We rely on user-space to write the initial superblock, and support
930 * reading and updating of superblocks.
931 * Interface methods are:
932 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
933 * loads and validates a superblock on dev.
934 * if refdev != NULL, compare superblocks on both devices
936 * 0 - dev has a superblock that is compatible with refdev
937 * 1 - dev has a superblock that is compatible and newer than refdev
938 * so dev should be used as the refdev in future
939 * -EINVAL superblock incompatible or invalid
940 * -othererror e.g. -EIO
942 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
943 * Verify that dev is acceptable into mddev.
944 * The first time, mddev->raid_disks will be 0, and data from
945 * dev should be merged in. Subsequent calls check that dev
946 * is new enough. Return 0 or -EINVAL
948 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
949 * Update the superblock for rdev with data in mddev
950 * This does not write to disc.
956 struct module *owner;
957 int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev,
959 int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev);
960 void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev);
961 unsigned long long (*rdev_size_change)(mdk_rdev_t *rdev,
962 sector_t num_sectors);
966 * Check that the given mddev has no bitmap.
968 * This function is called from the run method of all personalities that do not
969 * support bitmaps. It prints an error message and returns non-zero if mddev
970 * has a bitmap. Otherwise, it returns 0.
973 int md_check_no_bitmap(mddev_t *mddev)
975 if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset)
977 printk(KERN_ERR "%s: bitmaps are not supported for %s\n",
978 mdname(mddev), mddev->pers->name);
981 EXPORT_SYMBOL(md_check_no_bitmap);
984 * load_super for 0.90.0
986 static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
988 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
993 * Calculate the position of the superblock (512byte sectors),
994 * it's at the end of the disk.
996 * It also happens to be a multiple of 4Kb.
998 rdev->sb_start = calc_dev_sboffset(rdev);
1000 ret = read_disk_sb(rdev, MD_SB_BYTES);
1001 if (ret) return ret;
1005 bdevname(rdev->bdev, b);
1006 sb = (mdp_super_t*)page_address(rdev->sb_page);
1008 if (sb->md_magic != MD_SB_MAGIC) {
1009 printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
1014 if (sb->major_version != 0 ||
1015 sb->minor_version < 90 ||
1016 sb->minor_version > 91) {
1017 printk(KERN_WARNING "Bad version number %d.%d on %s\n",
1018 sb->major_version, sb->minor_version,
1023 if (sb->raid_disks <= 0)
1026 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
1027 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
1032 rdev->preferred_minor = sb->md_minor;
1033 rdev->data_offset = 0;
1034 rdev->sb_size = MD_SB_BYTES;
1036 if (sb->level == LEVEL_MULTIPATH)
1039 rdev->desc_nr = sb->this_disk.number;
1045 mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page);
1046 if (!uuid_equal(refsb, sb)) {
1047 printk(KERN_WARNING "md: %s has different UUID to %s\n",
1048 b, bdevname(refdev->bdev,b2));
1051 if (!sb_equal(refsb, sb)) {
1052 printk(KERN_WARNING "md: %s has same UUID"
1053 " but different superblock to %s\n",
1054 b, bdevname(refdev->bdev, b2));
1058 ev2 = md_event(refsb);
1064 rdev->sectors = rdev->sb_start;
1066 if (rdev->sectors < sb->size * 2 && sb->level > 1)
1067 /* "this cannot possibly happen" ... */
1075 * validate_super for 0.90.0
1077 static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
1080 mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page);
1081 __u64 ev1 = md_event(sb);
1083 rdev->raid_disk = -1;
1084 clear_bit(Faulty, &rdev->flags);
1085 clear_bit(In_sync, &rdev->flags);
1086 clear_bit(WriteMostly, &rdev->flags);
1088 if (mddev->raid_disks == 0) {
1089 mddev->major_version = 0;
1090 mddev->minor_version = sb->minor_version;
1091 mddev->patch_version = sb->patch_version;
1092 mddev->external = 0;
1093 mddev->chunk_sectors = sb->chunk_size >> 9;
1094 mddev->ctime = sb->ctime;
1095 mddev->utime = sb->utime;
1096 mddev->level = sb->level;
1097 mddev->clevel[0] = 0;
1098 mddev->layout = sb->layout;
1099 mddev->raid_disks = sb->raid_disks;
1100 mddev->dev_sectors = sb->size * 2;
1101 mddev->events = ev1;
1102 mddev->bitmap_info.offset = 0;
1103 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
1105 if (mddev->minor_version >= 91) {
1106 mddev->reshape_position = sb->reshape_position;
1107 mddev->delta_disks = sb->delta_disks;
1108 mddev->new_level = sb->new_level;
1109 mddev->new_layout = sb->new_layout;
1110 mddev->new_chunk_sectors = sb->new_chunk >> 9;
1112 mddev->reshape_position = MaxSector;
1113 mddev->delta_disks = 0;
1114 mddev->new_level = mddev->level;
1115 mddev->new_layout = mddev->layout;
1116 mddev->new_chunk_sectors = mddev->chunk_sectors;
1119 if (sb->state & (1<<MD_SB_CLEAN))
1120 mddev->recovery_cp = MaxSector;
1122 if (sb->events_hi == sb->cp_events_hi &&
1123 sb->events_lo == sb->cp_events_lo) {
1124 mddev->recovery_cp = sb->recovery_cp;
1126 mddev->recovery_cp = 0;
1129 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
1130 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
1131 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
1132 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
1134 mddev->max_disks = MD_SB_DISKS;
1136 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
1137 mddev->bitmap_info.file == NULL)
1138 mddev->bitmap_info.offset =
1139 mddev->bitmap_info.default_offset;
1141 } else if (mddev->pers == NULL) {
1142 /* Insist on good event counter while assembling, except
1143 * for spares (which don't need an event count) */
1145 if (sb->disks[rdev->desc_nr].state & (
1146 (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE)))
1147 if (ev1 < mddev->events)
1149 } else if (mddev->bitmap) {
1150 /* if adding to array with a bitmap, then we can accept an
1151 * older device ... but not too old.
1153 if (ev1 < mddev->bitmap->events_cleared)
1156 if (ev1 < mddev->events)
1157 /* just a hot-add of a new device, leave raid_disk at -1 */
1161 if (mddev->level != LEVEL_MULTIPATH) {
1162 desc = sb->disks + rdev->desc_nr;
1164 if (desc->state & (1<<MD_DISK_FAULTY))
1165 set_bit(Faulty, &rdev->flags);
1166 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
1167 desc->raid_disk < mddev->raid_disks */) {
1168 set_bit(In_sync, &rdev->flags);
1169 rdev->raid_disk = desc->raid_disk;
1170 } else if (desc->state & (1<<MD_DISK_ACTIVE)) {
1171 /* active but not in sync implies recovery up to
1172 * reshape position. We don't know exactly where
1173 * that is, so set to zero for now */
1174 if (mddev->minor_version >= 91) {
1175 rdev->recovery_offset = 0;
1176 rdev->raid_disk = desc->raid_disk;
1179 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
1180 set_bit(WriteMostly, &rdev->flags);
1181 } else /* MULTIPATH are always insync */
1182 set_bit(In_sync, &rdev->flags);
1187 * sync_super for 0.90.0
1189 static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1193 int next_spare = mddev->raid_disks;
1196 /* make rdev->sb match mddev data..
1199 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1200 * 3/ any empty disks < next_spare become removed
1202 * disks[0] gets initialised to REMOVED because
1203 * we cannot be sure from other fields if it has
1204 * been initialised or not.
1207 int active=0, working=0,failed=0,spare=0,nr_disks=0;
1209 rdev->sb_size = MD_SB_BYTES;
1211 sb = (mdp_super_t*)page_address(rdev->sb_page);
1213 memset(sb, 0, sizeof(*sb));
1215 sb->md_magic = MD_SB_MAGIC;
1216 sb->major_version = mddev->major_version;
1217 sb->patch_version = mddev->patch_version;
1218 sb->gvalid_words = 0; /* ignored */
1219 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
1220 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
1221 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
1222 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
1224 sb->ctime = mddev->ctime;
1225 sb->level = mddev->level;
1226 sb->size = mddev->dev_sectors / 2;
1227 sb->raid_disks = mddev->raid_disks;
1228 sb->md_minor = mddev->md_minor;
1229 sb->not_persistent = 0;
1230 sb->utime = mddev->utime;
1232 sb->events_hi = (mddev->events>>32);
1233 sb->events_lo = (u32)mddev->events;
1235 if (mddev->reshape_position == MaxSector)
1236 sb->minor_version = 90;
1238 sb->minor_version = 91;
1239 sb->reshape_position = mddev->reshape_position;
1240 sb->new_level = mddev->new_level;
1241 sb->delta_disks = mddev->delta_disks;
1242 sb->new_layout = mddev->new_layout;
1243 sb->new_chunk = mddev->new_chunk_sectors << 9;
1245 mddev->minor_version = sb->minor_version;
1248 sb->recovery_cp = mddev->recovery_cp;
1249 sb->cp_events_hi = (mddev->events>>32);
1250 sb->cp_events_lo = (u32)mddev->events;
1251 if (mddev->recovery_cp == MaxSector)
1252 sb->state = (1<< MD_SB_CLEAN);
1254 sb->recovery_cp = 0;
1256 sb->layout = mddev->layout;
1257 sb->chunk_size = mddev->chunk_sectors << 9;
1259 if (mddev->bitmap && mddev->bitmap_info.file == NULL)
1260 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
1262 sb->disks[0].state = (1<<MD_DISK_REMOVED);
1263 list_for_each_entry(rdev2, &mddev->disks, same_set) {
1266 int is_active = test_bit(In_sync, &rdev2->flags);
1268 if (rdev2->raid_disk >= 0 &&
1269 sb->minor_version >= 91)
1270 /* we have nowhere to store the recovery_offset,
1271 * but if it is not below the reshape_position,
1272 * we can piggy-back on that.
1275 if (rdev2->raid_disk < 0 ||
1276 test_bit(Faulty, &rdev2->flags))
1279 desc_nr = rdev2->raid_disk;
1281 desc_nr = next_spare++;
1282 rdev2->desc_nr = desc_nr;
1283 d = &sb->disks[rdev2->desc_nr];
1285 d->number = rdev2->desc_nr;
1286 d->major = MAJOR(rdev2->bdev->bd_dev);
1287 d->minor = MINOR(rdev2->bdev->bd_dev);
1289 d->raid_disk = rdev2->raid_disk;
1291 d->raid_disk = rdev2->desc_nr; /* compatibility */
1292 if (test_bit(Faulty, &rdev2->flags))
1293 d->state = (1<<MD_DISK_FAULTY);
1294 else if (is_active) {
1295 d->state = (1<<MD_DISK_ACTIVE);
1296 if (test_bit(In_sync, &rdev2->flags))
1297 d->state |= (1<<MD_DISK_SYNC);
1305 if (test_bit(WriteMostly, &rdev2->flags))
1306 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1308 /* now set the "removed" and "faulty" bits on any missing devices */
1309 for (i=0 ; i < mddev->raid_disks ; i++) {
1310 mdp_disk_t *d = &sb->disks[i];
1311 if (d->state == 0 && d->number == 0) {
1314 d->state = (1<<MD_DISK_REMOVED);
1315 d->state |= (1<<MD_DISK_FAULTY);
1319 sb->nr_disks = nr_disks;
1320 sb->active_disks = active;
1321 sb->working_disks = working;
1322 sb->failed_disks = failed;
1323 sb->spare_disks = spare;
1325 sb->this_disk = sb->disks[rdev->desc_nr];
1326 sb->sb_csum = calc_sb_csum(sb);
1330 * rdev_size_change for 0.90.0
1332 static unsigned long long
1333 super_90_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors)
1335 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1336 return 0; /* component must fit device */
1337 if (rdev->mddev->bitmap_info.offset)
1338 return 0; /* can't move bitmap */
1339 rdev->sb_start = calc_dev_sboffset(rdev);
1340 if (!num_sectors || num_sectors > rdev->sb_start)
1341 num_sectors = rdev->sb_start;
1342 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1344 md_super_wait(rdev->mddev);
1350 * version 1 superblock
1353 static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb)
1357 unsigned long long newcsum;
1358 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1359 __le32 *isuper = (__le32*)sb;
1362 disk_csum = sb->sb_csum;
1365 for (i=0; size>=4; size -= 4 )
1366 newcsum += le32_to_cpu(*isuper++);
1369 newcsum += le16_to_cpu(*(__le16*) isuper);
1371 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1372 sb->sb_csum = disk_csum;
1373 return cpu_to_le32(csum);
1376 static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
1378 struct mdp_superblock_1 *sb;
1381 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1385 * Calculate the position of the superblock in 512byte sectors.
1386 * It is always aligned to a 4K boundary and
1387 * depeding on minor_version, it can be:
1388 * 0: At least 8K, but less than 12K, from end of device
1389 * 1: At start of device
1390 * 2: 4K from start of device.
1392 switch(minor_version) {
1394 sb_start = i_size_read(rdev->bdev->bd_inode) >> 9;
1396 sb_start &= ~(sector_t)(4*2-1);
1407 rdev->sb_start = sb_start;
1409 /* superblock is rarely larger than 1K, but it can be larger,
1410 * and it is safe to read 4k, so we do that
1412 ret = read_disk_sb(rdev, 4096);
1413 if (ret) return ret;
1416 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1418 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1419 sb->major_version != cpu_to_le32(1) ||
1420 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1421 le64_to_cpu(sb->super_offset) != rdev->sb_start ||
1422 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1425 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1426 printk("md: invalid superblock checksum on %s\n",
1427 bdevname(rdev->bdev,b));
1430 if (le64_to_cpu(sb->data_size) < 10) {
1431 printk("md: data_size too small on %s\n",
1432 bdevname(rdev->bdev,b));
1436 rdev->preferred_minor = 0xffff;
1437 rdev->data_offset = le64_to_cpu(sb->data_offset);
1438 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1440 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1441 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1442 if (rdev->sb_size & bmask)
1443 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1446 && rdev->data_offset < sb_start + (rdev->sb_size/512))
1449 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1452 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1458 struct mdp_superblock_1 *refsb =
1459 (struct mdp_superblock_1*)page_address(refdev->sb_page);
1461 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1462 sb->level != refsb->level ||
1463 sb->layout != refsb->layout ||
1464 sb->chunksize != refsb->chunksize) {
1465 printk(KERN_WARNING "md: %s has strangely different"
1466 " superblock to %s\n",
1467 bdevname(rdev->bdev,b),
1468 bdevname(refdev->bdev,b2));
1471 ev1 = le64_to_cpu(sb->events);
1472 ev2 = le64_to_cpu(refsb->events);
1480 rdev->sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) -
1481 le64_to_cpu(sb->data_offset);
1483 rdev->sectors = rdev->sb_start;
1484 if (rdev->sectors < le64_to_cpu(sb->data_size))
1486 rdev->sectors = le64_to_cpu(sb->data_size);
1487 if (le64_to_cpu(sb->size) > rdev->sectors)
1492 static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
1494 struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1495 __u64 ev1 = le64_to_cpu(sb->events);
1497 rdev->raid_disk = -1;
1498 clear_bit(Faulty, &rdev->flags);
1499 clear_bit(In_sync, &rdev->flags);
1500 clear_bit(WriteMostly, &rdev->flags);
1502 if (mddev->raid_disks == 0) {
1503 mddev->major_version = 1;
1504 mddev->patch_version = 0;
1505 mddev->external = 0;
1506 mddev->chunk_sectors = le32_to_cpu(sb->chunksize);
1507 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1508 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1509 mddev->level = le32_to_cpu(sb->level);
1510 mddev->clevel[0] = 0;
1511 mddev->layout = le32_to_cpu(sb->layout);
1512 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1513 mddev->dev_sectors = le64_to_cpu(sb->size);
1514 mddev->events = ev1;
1515 mddev->bitmap_info.offset = 0;
1516 mddev->bitmap_info.default_offset = 1024 >> 9;
1518 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1519 memcpy(mddev->uuid, sb->set_uuid, 16);
1521 mddev->max_disks = (4096-256)/2;
1523 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1524 mddev->bitmap_info.file == NULL )
1525 mddev->bitmap_info.offset =
1526 (__s32)le32_to_cpu(sb->bitmap_offset);
1528 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1529 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1530 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1531 mddev->new_level = le32_to_cpu(sb->new_level);
1532 mddev->new_layout = le32_to_cpu(sb->new_layout);
1533 mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk);
1535 mddev->reshape_position = MaxSector;
1536 mddev->delta_disks = 0;
1537 mddev->new_level = mddev->level;
1538 mddev->new_layout = mddev->layout;
1539 mddev->new_chunk_sectors = mddev->chunk_sectors;
1542 } else if (mddev->pers == NULL) {
1543 /* Insist of good event counter while assembling, except for
1544 * spares (which don't need an event count) */
1546 if (rdev->desc_nr >= 0 &&
1547 rdev->desc_nr < le32_to_cpu(sb->max_dev) &&
1548 le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < 0xfffe)
1549 if (ev1 < mddev->events)
1551 } else if (mddev->bitmap) {
1552 /* If adding to array with a bitmap, then we can accept an
1553 * older device, but not too old.
1555 if (ev1 < mddev->bitmap->events_cleared)
1558 if (ev1 < mddev->events)
1559 /* just a hot-add of a new device, leave raid_disk at -1 */
1562 if (mddev->level != LEVEL_MULTIPATH) {
1564 if (rdev->desc_nr < 0 ||
1565 rdev->desc_nr >= le32_to_cpu(sb->max_dev)) {
1569 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1571 case 0xffff: /* spare */
1573 case 0xfffe: /* faulty */
1574 set_bit(Faulty, &rdev->flags);
1577 if ((le32_to_cpu(sb->feature_map) &
1578 MD_FEATURE_RECOVERY_OFFSET))
1579 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1581 set_bit(In_sync, &rdev->flags);
1582 rdev->raid_disk = role;
1585 if (sb->devflags & WriteMostly1)
1586 set_bit(WriteMostly, &rdev->flags);
1587 } else /* MULTIPATH are always insync */
1588 set_bit(In_sync, &rdev->flags);
1593 static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1595 struct mdp_superblock_1 *sb;
1598 /* make rdev->sb match mddev and rdev data. */
1600 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1602 sb->feature_map = 0;
1604 sb->recovery_offset = cpu_to_le64(0);
1605 memset(sb->pad1, 0, sizeof(sb->pad1));
1606 memset(sb->pad2, 0, sizeof(sb->pad2));
1607 memset(sb->pad3, 0, sizeof(sb->pad3));
1609 sb->utime = cpu_to_le64((__u64)mddev->utime);
1610 sb->events = cpu_to_le64(mddev->events);
1612 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1614 sb->resync_offset = cpu_to_le64(0);
1616 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
1618 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
1619 sb->size = cpu_to_le64(mddev->dev_sectors);
1620 sb->chunksize = cpu_to_le32(mddev->chunk_sectors);
1621 sb->level = cpu_to_le32(mddev->level);
1622 sb->layout = cpu_to_le32(mddev->layout);
1624 if (mddev->bitmap && mddev->bitmap_info.file == NULL) {
1625 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset);
1626 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
1629 if (rdev->raid_disk >= 0 &&
1630 !test_bit(In_sync, &rdev->flags)) {
1632 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1633 sb->recovery_offset =
1634 cpu_to_le64(rdev->recovery_offset);
1637 if (mddev->reshape_position != MaxSector) {
1638 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1639 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1640 sb->new_layout = cpu_to_le32(mddev->new_layout);
1641 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1642 sb->new_level = cpu_to_le32(mddev->new_level);
1643 sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors);
1647 list_for_each_entry(rdev2, &mddev->disks, same_set)
1648 if (rdev2->desc_nr+1 > max_dev)
1649 max_dev = rdev2->desc_nr+1;
1651 if (max_dev > le32_to_cpu(sb->max_dev)) {
1653 sb->max_dev = cpu_to_le32(max_dev);
1654 rdev->sb_size = max_dev * 2 + 256;
1655 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1656 if (rdev->sb_size & bmask)
1657 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1659 max_dev = le32_to_cpu(sb->max_dev);
1661 for (i=0; i<max_dev;i++)
1662 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1664 list_for_each_entry(rdev2, &mddev->disks, same_set) {
1666 if (test_bit(Faulty, &rdev2->flags))
1667 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1668 else if (test_bit(In_sync, &rdev2->flags))
1669 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1670 else if (rdev2->raid_disk >= 0)
1671 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1673 sb->dev_roles[i] = cpu_to_le16(0xffff);
1676 sb->sb_csum = calc_sb_1_csum(sb);
1679 static unsigned long long
1680 super_1_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors)
1682 struct mdp_superblock_1 *sb;
1683 sector_t max_sectors;
1684 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1685 return 0; /* component must fit device */
1686 if (rdev->sb_start < rdev->data_offset) {
1687 /* minor versions 1 and 2; superblock before data */
1688 max_sectors = i_size_read(rdev->bdev->bd_inode) >> 9;
1689 max_sectors -= rdev->data_offset;
1690 if (!num_sectors || num_sectors > max_sectors)
1691 num_sectors = max_sectors;
1692 } else if (rdev->mddev->bitmap_info.offset) {
1693 /* minor version 0 with bitmap we can't move */
1696 /* minor version 0; superblock after data */
1698 sb_start = (i_size_read(rdev->bdev->bd_inode) >> 9) - 8*2;
1699 sb_start &= ~(sector_t)(4*2 - 1);
1700 max_sectors = rdev->sectors + sb_start - rdev->sb_start;
1701 if (!num_sectors || num_sectors > max_sectors)
1702 num_sectors = max_sectors;
1703 rdev->sb_start = sb_start;
1705 sb = (struct mdp_superblock_1 *) page_address(rdev->sb_page);
1706 sb->data_size = cpu_to_le64(num_sectors);
1707 sb->super_offset = rdev->sb_start;
1708 sb->sb_csum = calc_sb_1_csum(sb);
1709 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1711 md_super_wait(rdev->mddev);
1715 static struct super_type super_types[] = {
1718 .owner = THIS_MODULE,
1719 .load_super = super_90_load,
1720 .validate_super = super_90_validate,
1721 .sync_super = super_90_sync,
1722 .rdev_size_change = super_90_rdev_size_change,
1726 .owner = THIS_MODULE,
1727 .load_super = super_1_load,
1728 .validate_super = super_1_validate,
1729 .sync_super = super_1_sync,
1730 .rdev_size_change = super_1_rdev_size_change,
1734 static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)
1736 mdk_rdev_t *rdev, *rdev2;
1739 rdev_for_each_rcu(rdev, mddev1)
1740 rdev_for_each_rcu(rdev2, mddev2)
1741 if (rdev->bdev->bd_contains ==
1742 rdev2->bdev->bd_contains) {
1750 static LIST_HEAD(pending_raid_disks);
1753 * Try to register data integrity profile for an mddev
1755 * This is called when an array is started and after a disk has been kicked
1756 * from the array. It only succeeds if all working and active component devices
1757 * are integrity capable with matching profiles.
1759 int md_integrity_register(mddev_t *mddev)
1761 mdk_rdev_t *rdev, *reference = NULL;
1763 if (list_empty(&mddev->disks))
1764 return 0; /* nothing to do */
1765 if (blk_get_integrity(mddev->gendisk))
1766 return 0; /* already registered */
1767 list_for_each_entry(rdev, &mddev->disks, same_set) {
1768 /* skip spares and non-functional disks */
1769 if (test_bit(Faulty, &rdev->flags))
1771 if (rdev->raid_disk < 0)
1774 * If at least one rdev is not integrity capable, we can not
1775 * enable data integrity for the md device.
1777 if (!bdev_get_integrity(rdev->bdev))
1780 /* Use the first rdev as the reference */
1784 /* does this rdev's profile match the reference profile? */
1785 if (blk_integrity_compare(reference->bdev->bd_disk,
1786 rdev->bdev->bd_disk) < 0)
1790 * All component devices are integrity capable and have matching
1791 * profiles, register the common profile for the md device.
1793 if (blk_integrity_register(mddev->gendisk,
1794 bdev_get_integrity(reference->bdev)) != 0) {
1795 printk(KERN_ERR "md: failed to register integrity for %s\n",
1799 printk(KERN_NOTICE "md: data integrity on %s enabled\n",
1803 EXPORT_SYMBOL(md_integrity_register);
1805 /* Disable data integrity if non-capable/non-matching disk is being added */
1806 void md_integrity_add_rdev(mdk_rdev_t *rdev, mddev_t *mddev)
1808 struct blk_integrity *bi_rdev = bdev_get_integrity(rdev->bdev);
1809 struct blk_integrity *bi_mddev = blk_get_integrity(mddev->gendisk);
1811 if (!bi_mddev) /* nothing to do */
1813 if (rdev->raid_disk < 0) /* skip spares */
1815 if (bi_rdev && blk_integrity_compare(mddev->gendisk,
1816 rdev->bdev->bd_disk) >= 0)
1818 printk(KERN_NOTICE "disabling data integrity on %s\n", mdname(mddev));
1819 blk_integrity_unregister(mddev->gendisk);
1821 EXPORT_SYMBOL(md_integrity_add_rdev);
1823 static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
1825 char b[BDEVNAME_SIZE];
1835 /* prevent duplicates */
1836 if (find_rdev(mddev, rdev->bdev->bd_dev))
1839 /* make sure rdev->sectors exceeds mddev->dev_sectors */
1840 if (rdev->sectors && (mddev->dev_sectors == 0 ||
1841 rdev->sectors < mddev->dev_sectors)) {
1843 /* Cannot change size, so fail
1844 * If mddev->level <= 0, then we don't care
1845 * about aligning sizes (e.g. linear)
1847 if (mddev->level > 0)
1850 mddev->dev_sectors = rdev->sectors;
1853 /* Verify rdev->desc_nr is unique.
1854 * If it is -1, assign a free number, else
1855 * check number is not in use
1857 if (rdev->desc_nr < 0) {
1859 if (mddev->pers) choice = mddev->raid_disks;
1860 while (find_rdev_nr(mddev, choice))
1862 rdev->desc_nr = choice;
1864 if (find_rdev_nr(mddev, rdev->desc_nr))
1867 if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) {
1868 printk(KERN_WARNING "md: %s: array is limited to %d devices\n",
1869 mdname(mddev), mddev->max_disks);
1872 bdevname(rdev->bdev,b);
1873 while ( (s=strchr(b, '/')) != NULL)
1876 rdev->mddev = mddev;
1877 printk(KERN_INFO "md: bind<%s>\n", b);
1879 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
1882 ko = &part_to_dev(rdev->bdev->bd_part)->kobj;
1883 if (sysfs_create_link(&rdev->kobj, ko, "block"))
1884 /* failure here is OK */;
1885 rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state");
1887 list_add_rcu(&rdev->same_set, &mddev->disks);
1888 bd_claim_by_disk(rdev->bdev, rdev->bdev->bd_holder, mddev->gendisk);
1890 /* May as well allow recovery to be retried once */
1891 mddev->recovery_disabled = 0;
1896 printk(KERN_WARNING "md: failed to register dev-%s for %s\n",
1901 static void md_delayed_delete(struct work_struct *ws)
1903 mdk_rdev_t *rdev = container_of(ws, mdk_rdev_t, del_work);
1904 kobject_del(&rdev->kobj);
1905 kobject_put(&rdev->kobj);
1908 static void unbind_rdev_from_array(mdk_rdev_t * rdev)
1910 char b[BDEVNAME_SIZE];
1915 bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk);
1916 list_del_rcu(&rdev->same_set);
1917 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
1919 sysfs_remove_link(&rdev->kobj, "block");
1920 sysfs_put(rdev->sysfs_state);
1921 rdev->sysfs_state = NULL;
1922 /* We need to delay this, otherwise we can deadlock when
1923 * writing to 'remove' to "dev/state". We also need
1924 * to delay it due to rcu usage.
1927 INIT_WORK(&rdev->del_work, md_delayed_delete);
1928 kobject_get(&rdev->kobj);
1929 queue_work(md_misc_wq, &rdev->del_work);
1933 * prevent the device from being mounted, repartitioned or
1934 * otherwise reused by a RAID array (or any other kernel
1935 * subsystem), by bd_claiming the device.
1937 static int lock_rdev(mdk_rdev_t *rdev, dev_t dev, int shared)
1940 struct block_device *bdev;
1941 char b[BDEVNAME_SIZE];
1943 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
1945 printk(KERN_ERR "md: could not open %s.\n",
1946 __bdevname(dev, b));
1947 return PTR_ERR(bdev);
1949 err = bd_claim(bdev, shared ? (mdk_rdev_t *)lock_rdev : rdev);
1951 printk(KERN_ERR "md: could not bd_claim %s.\n",
1953 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
1957 set_bit(AllReserved, &rdev->flags);
1962 static void unlock_rdev(mdk_rdev_t *rdev)
1964 struct block_device *bdev = rdev->bdev;
1969 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
1972 void md_autodetect_dev(dev_t dev);
1974 static void export_rdev(mdk_rdev_t * rdev)
1976 char b[BDEVNAME_SIZE];
1977 printk(KERN_INFO "md: export_rdev(%s)\n",
1978 bdevname(rdev->bdev,b));
1983 if (test_bit(AutoDetected, &rdev->flags))
1984 md_autodetect_dev(rdev->bdev->bd_dev);
1987 kobject_put(&rdev->kobj);
1990 static void kick_rdev_from_array(mdk_rdev_t * rdev)
1992 unbind_rdev_from_array(rdev);
1996 static void export_array(mddev_t *mddev)
1998 mdk_rdev_t *rdev, *tmp;
2000 rdev_for_each(rdev, tmp, mddev) {
2005 kick_rdev_from_array(rdev);
2007 if (!list_empty(&mddev->disks))
2009 mddev->raid_disks = 0;
2010 mddev->major_version = 0;
2013 static void print_desc(mdp_disk_t *desc)
2015 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
2016 desc->major,desc->minor,desc->raid_disk,desc->state);
2019 static void print_sb_90(mdp_super_t *sb)
2024 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
2025 sb->major_version, sb->minor_version, sb->patch_version,
2026 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
2028 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
2029 sb->level, sb->size, sb->nr_disks, sb->raid_disks,
2030 sb->md_minor, sb->layout, sb->chunk_size);
2031 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
2032 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
2033 sb->utime, sb->state, sb->active_disks, sb->working_disks,
2034 sb->failed_disks, sb->spare_disks,
2035 sb->sb_csum, (unsigned long)sb->events_lo);
2038 for (i = 0; i < MD_SB_DISKS; i++) {
2041 desc = sb->disks + i;
2042 if (desc->number || desc->major || desc->minor ||
2043 desc->raid_disk || (desc->state && (desc->state != 4))) {
2044 printk(" D %2d: ", i);
2048 printk(KERN_INFO "md: THIS: ");
2049 print_desc(&sb->this_disk);
2052 static void print_sb_1(struct mdp_superblock_1 *sb)
2056 uuid = sb->set_uuid;
2058 "md: SB: (V:%u) (F:0x%08x) Array-ID:<%pU>\n"
2059 "md: Name: \"%s\" CT:%llu\n",
2060 le32_to_cpu(sb->major_version),
2061 le32_to_cpu(sb->feature_map),
2064 (unsigned long long)le64_to_cpu(sb->ctime)
2065 & MD_SUPERBLOCK_1_TIME_SEC_MASK);
2067 uuid = sb->device_uuid;
2069 "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu"
2071 "md: Dev:%08x UUID: %pU\n"
2072 "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n"
2073 "md: (MaxDev:%u) \n",
2074 le32_to_cpu(sb->level),
2075 (unsigned long long)le64_to_cpu(sb->size),
2076 le32_to_cpu(sb->raid_disks),
2077 le32_to_cpu(sb->layout),
2078 le32_to_cpu(sb->chunksize),
2079 (unsigned long long)le64_to_cpu(sb->data_offset),
2080 (unsigned long long)le64_to_cpu(sb->data_size),
2081 (unsigned long long)le64_to_cpu(sb->super_offset),
2082 (unsigned long long)le64_to_cpu(sb->recovery_offset),
2083 le32_to_cpu(sb->dev_number),
2086 (unsigned long long)le64_to_cpu(sb->utime) & MD_SUPERBLOCK_1_TIME_SEC_MASK,
2087 (unsigned long long)le64_to_cpu(sb->events),
2088 (unsigned long long)le64_to_cpu(sb->resync_offset),
2089 le32_to_cpu(sb->sb_csum),
2090 le32_to_cpu(sb->max_dev)
2094 static void print_rdev(mdk_rdev_t *rdev, int major_version)
2096 char b[BDEVNAME_SIZE];
2097 printk(KERN_INFO "md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n",
2098 bdevname(rdev->bdev, b), (unsigned long long)rdev->sectors,
2099 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
2101 if (rdev->sb_loaded) {
2102 printk(KERN_INFO "md: rdev superblock (MJ:%d):\n", major_version);
2103 switch (major_version) {
2105 print_sb_90((mdp_super_t*)page_address(rdev->sb_page));
2108 print_sb_1((struct mdp_superblock_1 *)page_address(rdev->sb_page));
2112 printk(KERN_INFO "md: no rdev superblock!\n");
2115 static void md_print_devices(void)
2117 struct list_head *tmp;
2120 char b[BDEVNAME_SIZE];
2123 printk("md: **********************************\n");
2124 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
2125 printk("md: **********************************\n");
2126 for_each_mddev(mddev, tmp) {
2129 bitmap_print_sb(mddev->bitmap);
2131 printk("%s: ", mdname(mddev));
2132 list_for_each_entry(rdev, &mddev->disks, same_set)
2133 printk("<%s>", bdevname(rdev->bdev,b));
2136 list_for_each_entry(rdev, &mddev->disks, same_set)
2137 print_rdev(rdev, mddev->major_version);
2139 printk("md: **********************************\n");
2144 static void sync_sbs(mddev_t * mddev, int nospares)
2146 /* Update each superblock (in-memory image), but
2147 * if we are allowed to, skip spares which already
2148 * have the right event counter, or have one earlier
2149 * (which would mean they aren't being marked as dirty
2150 * with the rest of the array)
2153 list_for_each_entry(rdev, &mddev->disks, same_set) {
2154 if (rdev->sb_events == mddev->events ||
2156 rdev->raid_disk < 0 &&
2157 rdev->sb_events+1 == mddev->events)) {
2158 /* Don't update this superblock */
2159 rdev->sb_loaded = 2;
2161 super_types[mddev->major_version].
2162 sync_super(mddev, rdev);
2163 rdev->sb_loaded = 1;
2168 static void md_update_sb(mddev_t * mddev, int force_change)
2175 /* First make sure individual recovery_offsets are correct */
2176 list_for_each_entry(rdev, &mddev->disks, same_set) {
2177 if (rdev->raid_disk >= 0 &&
2178 mddev->delta_disks >= 0 &&
2179 !test_bit(In_sync, &rdev->flags) &&
2180 mddev->curr_resync_completed > rdev->recovery_offset)
2181 rdev->recovery_offset = mddev->curr_resync_completed;
2184 if (!mddev->persistent) {
2185 clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
2186 clear_bit(MD_CHANGE_DEVS, &mddev->flags);
2187 if (!mddev->external)
2188 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2189 wake_up(&mddev->sb_wait);
2193 spin_lock_irq(&mddev->write_lock);
2195 mddev->utime = get_seconds();
2197 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
2199 if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags))
2200 /* just a clean<-> dirty transition, possibly leave spares alone,
2201 * though if events isn't the right even/odd, we will have to do
2207 if (mddev->degraded)
2208 /* If the array is degraded, then skipping spares is both
2209 * dangerous and fairly pointless.
2210 * Dangerous because a device that was removed from the array
2211 * might have a event_count that still looks up-to-date,
2212 * so it can be re-added without a resync.
2213 * Pointless because if there are any spares to skip,
2214 * then a recovery will happen and soon that array won't
2215 * be degraded any more and the spare can go back to sleep then.
2219 sync_req = mddev->in_sync;
2221 /* If this is just a dirty<->clean transition, and the array is clean
2222 * and 'events' is odd, we can roll back to the previous clean state */
2224 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
2225 && mddev->can_decrease_events
2226 && mddev->events != 1) {
2228 mddev->can_decrease_events = 0;
2230 /* otherwise we have to go forward and ... */
2232 mddev->can_decrease_events = nospares;
2235 if (!mddev->events) {
2237 * oops, this 64-bit counter should never wrap.
2238 * Either we are in around ~1 trillion A.C., assuming
2239 * 1 reboot per second, or we have a bug:
2244 sync_sbs(mddev, nospares);
2245 spin_unlock_irq(&mddev->write_lock);
2248 "md: updating %s RAID superblock on device (in sync %d)\n",
2249 mdname(mddev),mddev->in_sync);
2251 bitmap_update_sb(mddev->bitmap);
2252 list_for_each_entry(rdev, &mddev->disks, same_set) {
2253 char b[BDEVNAME_SIZE];
2254 dprintk(KERN_INFO "md: ");
2255 if (rdev->sb_loaded != 1)
2256 continue; /* no noise on spare devices */
2257 if (test_bit(Faulty, &rdev->flags))
2258 dprintk("(skipping faulty ");
2260 dprintk("%s ", bdevname(rdev->bdev,b));
2261 if (!test_bit(Faulty, &rdev->flags)) {
2262 md_super_write(mddev,rdev,
2263 rdev->sb_start, rdev->sb_size,
2265 dprintk(KERN_INFO "(write) %s's sb offset: %llu\n",
2266 bdevname(rdev->bdev,b),
2267 (unsigned long long)rdev->sb_start);
2268 rdev->sb_events = mddev->events;
2272 if (mddev->level == LEVEL_MULTIPATH)
2273 /* only need to write one superblock... */
2276 md_super_wait(mddev);
2277 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2279 spin_lock_irq(&mddev->write_lock);
2280 if (mddev->in_sync != sync_req ||
2281 test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
2282 /* have to write it out again */
2283 spin_unlock_irq(&mddev->write_lock);
2286 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2287 spin_unlock_irq(&mddev->write_lock);
2288 wake_up(&mddev->sb_wait);
2289 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
2290 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
2294 /* words written to sysfs files may, or may not, be \n terminated.
2295 * We want to accept with case. For this we use cmd_match.
2297 static int cmd_match(const char *cmd, const char *str)
2299 /* See if cmd, written into a sysfs file, matches
2300 * str. They must either be the same, or cmd can
2301 * have a trailing newline
2303 while (*cmd && *str && *cmd == *str) {
2314 struct rdev_sysfs_entry {
2315 struct attribute attr;
2316 ssize_t (*show)(mdk_rdev_t *, char *);
2317 ssize_t (*store)(mdk_rdev_t *, const char *, size_t);
2321 state_show(mdk_rdev_t *rdev, char *page)
2326 if (test_bit(Faulty, &rdev->flags)) {
2327 len+= sprintf(page+len, "%sfaulty",sep);
2330 if (test_bit(In_sync, &rdev->flags)) {
2331 len += sprintf(page+len, "%sin_sync",sep);
2334 if (test_bit(WriteMostly, &rdev->flags)) {
2335 len += sprintf(page+len, "%swrite_mostly",sep);
2338 if (test_bit(Blocked, &rdev->flags)) {
2339 len += sprintf(page+len, "%sblocked", sep);
2342 if (!test_bit(Faulty, &rdev->flags) &&
2343 !test_bit(In_sync, &rdev->flags)) {
2344 len += sprintf(page+len, "%sspare", sep);
2347 return len+sprintf(page+len, "\n");
2351 state_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2354 * faulty - simulates and error
2355 * remove - disconnects the device
2356 * writemostly - sets write_mostly
2357 * -writemostly - clears write_mostly
2358 * blocked - sets the Blocked flag
2359 * -blocked - clears the Blocked flag
2360 * insync - sets Insync providing device isn't active
2363 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
2364 md_error(rdev->mddev, rdev);
2366 } else if (cmd_match(buf, "remove")) {
2367 if (rdev->raid_disk >= 0)
2370 mddev_t *mddev = rdev->mddev;
2371 kick_rdev_from_array(rdev);
2373 md_update_sb(mddev, 1);
2374 md_new_event(mddev);
2377 } else if (cmd_match(buf, "writemostly")) {
2378 set_bit(WriteMostly, &rdev->flags);
2380 } else if (cmd_match(buf, "-writemostly")) {
2381 clear_bit(WriteMostly, &rdev->flags);
2383 } else if (cmd_match(buf, "blocked")) {
2384 set_bit(Blocked, &rdev->flags);
2386 } else if (cmd_match(buf, "-blocked")) {
2387 clear_bit(Blocked, &rdev->flags);
2388 wake_up(&rdev->blocked_wait);
2389 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2390 md_wakeup_thread(rdev->mddev->thread);
2393 } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) {
2394 set_bit(In_sync, &rdev->flags);
2398 sysfs_notify_dirent_safe(rdev->sysfs_state);
2399 return err ? err : len;
2401 static struct rdev_sysfs_entry rdev_state =
2402 __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store);
2405 errors_show(mdk_rdev_t *rdev, char *page)
2407 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
2411 errors_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2414 unsigned long n = simple_strtoul(buf, &e, 10);
2415 if (*buf && (*e == 0 || *e == '\n')) {
2416 atomic_set(&rdev->corrected_errors, n);
2421 static struct rdev_sysfs_entry rdev_errors =
2422 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
2425 slot_show(mdk_rdev_t *rdev, char *page)
2427 if (rdev->raid_disk < 0)
2428 return sprintf(page, "none\n");
2430 return sprintf(page, "%d\n", rdev->raid_disk);
2434 slot_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2439 int slot = simple_strtoul(buf, &e, 10);
2440 if (strncmp(buf, "none", 4)==0)
2442 else if (e==buf || (*e && *e!= '\n'))
2444 if (rdev->mddev->pers && slot == -1) {
2445 /* Setting 'slot' on an active array requires also
2446 * updating the 'rd%d' link, and communicating
2447 * with the personality with ->hot_*_disk.
2448 * For now we only support removing
2449 * failed/spare devices. This normally happens automatically,
2450 * but not when the metadata is externally managed.
2452 if (rdev->raid_disk == -1)
2454 /* personality does all needed checks */
2455 if (rdev->mddev->pers->hot_add_disk == NULL)
2457 err = rdev->mddev->pers->
2458 hot_remove_disk(rdev->mddev, rdev->raid_disk);
2461 sprintf(nm, "rd%d", rdev->raid_disk);
2462 sysfs_remove_link(&rdev->mddev->kobj, nm);
2463 rdev->raid_disk = -1;
2464 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2465 md_wakeup_thread(rdev->mddev->thread);
2466 } else if (rdev->mddev->pers) {
2468 /* Activating a spare .. or possibly reactivating
2469 * if we ever get bitmaps working here.
2472 if (rdev->raid_disk != -1)
2475 if (rdev->mddev->pers->hot_add_disk == NULL)
2478 list_for_each_entry(rdev2, &rdev->mddev->disks, same_set)
2479 if (rdev2->raid_disk == slot)
2482 if (slot >= rdev->mddev->raid_disks &&
2483 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
2486 rdev->raid_disk = slot;
2487 if (test_bit(In_sync, &rdev->flags))
2488 rdev->saved_raid_disk = slot;
2490 rdev->saved_raid_disk = -1;
2491 err = rdev->mddev->pers->
2492 hot_add_disk(rdev->mddev, rdev);
2494 rdev->raid_disk = -1;
2497 sysfs_notify_dirent_safe(rdev->sysfs_state);
2498 sprintf(nm, "rd%d", rdev->raid_disk);
2499 if (sysfs_create_link(&rdev->mddev->kobj, &rdev->kobj, nm))
2500 /* failure here is OK */;
2501 /* don't wakeup anyone, leave that to userspace. */
2503 if (slot >= rdev->mddev->raid_disks &&
2504 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
2506 rdev->raid_disk = slot;
2507 /* assume it is working */
2508 clear_bit(Faulty, &rdev->flags);
2509 clear_bit(WriteMostly, &rdev->flags);
2510 set_bit(In_sync, &rdev->flags);
2511 sysfs_notify_dirent_safe(rdev->sysfs_state);
2517 static struct rdev_sysfs_entry rdev_slot =
2518 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
2521 offset_show(mdk_rdev_t *rdev, char *page)
2523 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
2527 offset_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2530 unsigned long long offset = simple_strtoull(buf, &e, 10);
2531 if (e==buf || (*e && *e != '\n'))
2533 if (rdev->mddev->pers && rdev->raid_disk >= 0)
2535 if (rdev->sectors && rdev->mddev->external)
2536 /* Must set offset before size, so overlap checks
2539 rdev->data_offset = offset;
2543 static struct rdev_sysfs_entry rdev_offset =
2544 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
2547 rdev_size_show(mdk_rdev_t *rdev, char *page)
2549 return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2);
2552 static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
2554 /* check if two start/length pairs overlap */
2562 static int strict_blocks_to_sectors(const char *buf, sector_t *sectors)
2564 unsigned long long blocks;
2567 if (strict_strtoull(buf, 10, &blocks) < 0)
2570 if (blocks & 1ULL << (8 * sizeof(blocks) - 1))
2571 return -EINVAL; /* sector conversion overflow */
2574 if (new != blocks * 2)
2575 return -EINVAL; /* unsigned long long to sector_t overflow */
2582 rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2584 mddev_t *my_mddev = rdev->mddev;
2585 sector_t oldsectors = rdev->sectors;
2588 if (strict_blocks_to_sectors(buf, §ors) < 0)
2590 if (my_mddev->pers && rdev->raid_disk >= 0) {
2591 if (my_mddev->persistent) {
2592 sectors = super_types[my_mddev->major_version].
2593 rdev_size_change(rdev, sectors);
2596 } else if (!sectors)
2597 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) -
2600 if (sectors < my_mddev->dev_sectors)
2601 return -EINVAL; /* component must fit device */
2603 rdev->sectors = sectors;
2604 if (sectors > oldsectors && my_mddev->external) {
2605 /* need to check that all other rdevs with the same ->bdev
2606 * do not overlap. We need to unlock the mddev to avoid
2607 * a deadlock. We have already changed rdev->sectors, and if
2608 * we have to change it back, we will have the lock again.
2612 struct list_head *tmp;
2614 mddev_unlock(my_mddev);
2615 for_each_mddev(mddev, tmp) {
2619 list_for_each_entry(rdev2, &mddev->disks, same_set)
2620 if (test_bit(AllReserved, &rdev2->flags) ||
2621 (rdev->bdev == rdev2->bdev &&
2623 overlaps(rdev->data_offset, rdev->sectors,
2629 mddev_unlock(mddev);
2635 mddev_lock(my_mddev);
2637 /* Someone else could have slipped in a size
2638 * change here, but doing so is just silly.
2639 * We put oldsectors back because we *know* it is
2640 * safe, and trust userspace not to race with
2643 rdev->sectors = oldsectors;
2650 static struct rdev_sysfs_entry rdev_size =
2651 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
2654 static ssize_t recovery_start_show(mdk_rdev_t *rdev, char *page)
2656 unsigned long long recovery_start = rdev->recovery_offset;
2658 if (test_bit(In_sync, &rdev->flags) ||
2659 recovery_start == MaxSector)
2660 return sprintf(page, "none\n");
2662 return sprintf(page, "%llu\n", recovery_start);
2665 static ssize_t recovery_start_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2667 unsigned long long recovery_start;
2669 if (cmd_match(buf, "none"))
2670 recovery_start = MaxSector;
2671 else if (strict_strtoull(buf, 10, &recovery_start))
2674 if (rdev->mddev->pers &&
2675 rdev->raid_disk >= 0)
2678 rdev->recovery_offset = recovery_start;
2679 if (recovery_start == MaxSector)
2680 set_bit(In_sync, &rdev->flags);
2682 clear_bit(In_sync, &rdev->flags);
2686 static struct rdev_sysfs_entry rdev_recovery_start =
2687 __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store);
2689 static struct attribute *rdev_default_attrs[] = {
2695 &rdev_recovery_start.attr,
2699 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
2701 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2702 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
2703 mddev_t *mddev = rdev->mddev;
2709 rv = mddev ? mddev_lock(mddev) : -EBUSY;
2711 if (rdev->mddev == NULL)
2714 rv = entry->show(rdev, page);
2715 mddev_unlock(mddev);
2721 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
2722 const char *page, size_t length)
2724 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2725 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
2727 mddev_t *mddev = rdev->mddev;
2731 if (!capable(CAP_SYS_ADMIN))
2733 rv = mddev ? mddev_lock(mddev): -EBUSY;
2735 if (rdev->mddev == NULL)
2738 rv = entry->store(rdev, page, length);
2739 mddev_unlock(mddev);
2744 static void rdev_free(struct kobject *ko)
2746 mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj);
2749 static const struct sysfs_ops rdev_sysfs_ops = {
2750 .show = rdev_attr_show,
2751 .store = rdev_attr_store,
2753 static struct kobj_type rdev_ktype = {
2754 .release = rdev_free,
2755 .sysfs_ops = &rdev_sysfs_ops,
2756 .default_attrs = rdev_default_attrs,
2759 void md_rdev_init(mdk_rdev_t *rdev)
2762 rdev->saved_raid_disk = -1;
2763 rdev->raid_disk = -1;
2765 rdev->data_offset = 0;
2766 rdev->sb_events = 0;
2767 rdev->last_read_error.tv_sec = 0;
2768 rdev->last_read_error.tv_nsec = 0;
2769 atomic_set(&rdev->nr_pending, 0);
2770 atomic_set(&rdev->read_errors, 0);
2771 atomic_set(&rdev->corrected_errors, 0);
2773 INIT_LIST_HEAD(&rdev->same_set);
2774 init_waitqueue_head(&rdev->blocked_wait);
2776 EXPORT_SYMBOL_GPL(md_rdev_init);
2778 * Import a device. If 'super_format' >= 0, then sanity check the superblock
2780 * mark the device faulty if:
2782 * - the device is nonexistent (zero size)
2783 * - the device has no valid superblock
2785 * a faulty rdev _never_ has rdev->sb set.
2787 static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor)
2789 char b[BDEVNAME_SIZE];
2794 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
2796 printk(KERN_ERR "md: could not alloc mem for new device!\n");
2797 return ERR_PTR(-ENOMEM);
2801 if ((err = alloc_disk_sb(rdev)))
2804 err = lock_rdev(rdev, newdev, super_format == -2);
2808 kobject_init(&rdev->kobj, &rdev_ktype);
2810 size = i_size_read(rdev->bdev->bd_inode) >> BLOCK_SIZE_BITS;
2813 "md: %s has zero or unknown size, marking faulty!\n",
2814 bdevname(rdev->bdev,b));
2819 if (super_format >= 0) {
2820 err = super_types[super_format].
2821 load_super(rdev, NULL, super_minor);
2822 if (err == -EINVAL) {
2824 "md: %s does not have a valid v%d.%d "
2825 "superblock, not importing!\n",
2826 bdevname(rdev->bdev,b),
2827 super_format, super_minor);
2832 "md: could not read %s's sb, not importing!\n",
2833 bdevname(rdev->bdev,b));
2841 if (rdev->sb_page) {
2847 return ERR_PTR(err);
2851 * Check a full RAID array for plausibility
2855 static void analyze_sbs(mddev_t * mddev)
2858 mdk_rdev_t *rdev, *freshest, *tmp;
2859 char b[BDEVNAME_SIZE];
2862 rdev_for_each(rdev, tmp, mddev)
2863 switch (super_types[mddev->major_version].
2864 load_super(rdev, freshest, mddev->minor_version)) {
2872 "md: fatal superblock inconsistency in %s"
2873 " -- removing from array\n",
2874 bdevname(rdev->bdev,b));
2875 kick_rdev_from_array(rdev);
2879 super_types[mddev->major_version].
2880 validate_super(mddev, freshest);
2883 rdev_for_each(rdev, tmp, mddev) {
2884 if (mddev->max_disks &&
2885 (rdev->desc_nr >= mddev->max_disks ||
2886 i > mddev->max_disks)) {
2888 "md: %s: %s: only %d devices permitted\n",
2889 mdname(mddev), bdevname(rdev->bdev, b),
2891 kick_rdev_from_array(rdev);
2894 if (rdev != freshest)
2895 if (super_types[mddev->major_version].
2896 validate_super(mddev, rdev)) {
2897 printk(KERN_WARNING "md: kicking non-fresh %s"
2899 bdevname(rdev->bdev,b));
2900 kick_rdev_from_array(rdev);
2903 if (mddev->level == LEVEL_MULTIPATH) {
2904 rdev->desc_nr = i++;
2905 rdev->raid_disk = rdev->desc_nr;
2906 set_bit(In_sync, &rdev->flags);
2907 } else if (rdev->raid_disk >= (mddev->raid_disks - min(0, mddev->delta_disks))) {
2908 rdev->raid_disk = -1;
2909 clear_bit(In_sync, &rdev->flags);
2914 /* Read a fixed-point number.
2915 * Numbers in sysfs attributes should be in "standard" units where
2916 * possible, so time should be in seconds.
2917 * However we internally use a a much smaller unit such as
2918 * milliseconds or jiffies.
2919 * This function takes a decimal number with a possible fractional
2920 * component, and produces an integer which is the result of
2921 * multiplying that number by 10^'scale'.
2922 * all without any floating-point arithmetic.
2924 int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale)
2926 unsigned long result = 0;
2928 while (isdigit(*cp) || (*cp == '.' && decimals < 0)) {
2931 else if (decimals < scale) {
2934 result = result * 10 + value;
2946 while (decimals < scale) {
2955 static void md_safemode_timeout(unsigned long data);
2958 safe_delay_show(mddev_t *mddev, char *page)
2960 int msec = (mddev->safemode_delay*1000)/HZ;
2961 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
2964 safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len)
2968 if (strict_strtoul_scaled(cbuf, &msec, 3) < 0)
2971 mddev->safemode_delay = 0;
2973 unsigned long old_delay = mddev->safemode_delay;
2974 mddev->safemode_delay = (msec*HZ)/1000;
2975 if (mddev->safemode_delay == 0)
2976 mddev->safemode_delay = 1;
2977 if (mddev->safemode_delay < old_delay)
2978 md_safemode_timeout((unsigned long)mddev);
2982 static struct md_sysfs_entry md_safe_delay =
2983 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
2986 level_show(mddev_t *mddev, char *page)
2988 struct mdk_personality *p = mddev->pers;
2990 return sprintf(page, "%s\n", p->name);
2991 else if (mddev->clevel[0])
2992 return sprintf(page, "%s\n", mddev->clevel);
2993 else if (mddev->level != LEVEL_NONE)
2994 return sprintf(page, "%d\n", mddev->level);
3000 level_store(mddev_t *mddev, const char *buf, size_t len)
3004 struct mdk_personality *pers;
3009 if (mddev->pers == NULL) {
3012 if (len >= sizeof(mddev->clevel))
3014 strncpy(mddev->clevel, buf, len);
3015 if (mddev->clevel[len-1] == '\n')
3017 mddev->clevel[len] = 0;
3018 mddev->level = LEVEL_NONE;
3022 /* request to change the personality. Need to ensure:
3023 * - array is not engaged in resync/recovery/reshape
3024 * - old personality can be suspended
3025 * - new personality will access other array.
3028 if (mddev->sync_thread ||
3029 mddev->reshape_position != MaxSector ||
3030 mddev->sysfs_active)
3033 if (!mddev->pers->quiesce) {
3034 printk(KERN_WARNING "md: %s: %s does not support online personality change\n",
3035 mdname(mddev), mddev->pers->name);
3039 /* Now find the new personality */
3040 if (len == 0 || len >= sizeof(clevel))
3042 strncpy(clevel, buf, len);
3043 if (clevel[len-1] == '\n')
3046 if (strict_strtol(clevel, 10, &level))
3049 if (request_module("md-%s", clevel) != 0)
3050 request_module("md-level-%s", clevel);
3051 spin_lock(&pers_lock);
3052 pers = find_pers(level, clevel);
3053 if (!pers || !try_module_get(pers->owner)) {
3054 spin_unlock(&pers_lock);
3055 printk(KERN_WARNING "md: personality %s not loaded\n", clevel);
3058 spin_unlock(&pers_lock);
3060 if (pers == mddev->pers) {
3061 /* Nothing to do! */
3062 module_put(pers->owner);
3065 if (!pers->takeover) {
3066 module_put(pers->owner);
3067 printk(KERN_WARNING "md: %s: %s does not support personality takeover\n",
3068 mdname(mddev), clevel);
3072 list_for_each_entry(rdev, &mddev->disks, same_set)
3073 rdev->new_raid_disk = rdev->raid_disk;
3075 /* ->takeover must set new_* and/or delta_disks
3076 * if it succeeds, and may set them when it fails.
3078 priv = pers->takeover(mddev);
3080 mddev->new_level = mddev->level;
3081 mddev->new_layout = mddev->layout;
3082 mddev->new_chunk_sectors = mddev->chunk_sectors;
3083 mddev->raid_disks -= mddev->delta_disks;
3084 mddev->delta_disks = 0;
3085 module_put(pers->owner);
3086 printk(KERN_WARNING "md: %s: %s would not accept array\n",
3087 mdname(mddev), clevel);
3088 return PTR_ERR(priv);
3091 /* Looks like we have a winner */
3092 mddev_suspend(mddev);
3093 mddev->pers->stop(mddev);
3095 if (mddev->pers->sync_request == NULL &&
3096 pers->sync_request != NULL) {
3097 /* need to add the md_redundancy_group */
3098 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
3100 "md: cannot register extra attributes for %s\n",
3102 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, NULL, "sync_action");
3104 if (mddev->pers->sync_request != NULL &&
3105 pers->sync_request == NULL) {
3106 /* need to remove the md_redundancy_group */
3107 if (mddev->to_remove == NULL)
3108 mddev->to_remove = &md_redundancy_group;
3111 if (mddev->pers->sync_request == NULL &&
3113 /* We are converting from a no-redundancy array
3114 * to a redundancy array and metadata is managed
3115 * externally so we need to be sure that writes
3116 * won't block due to a need to transition
3118 * until external management is started.
3121 mddev->safemode_delay = 0;
3122 mddev->safemode = 0;
3125 list_for_each_entry(rdev, &mddev->disks, same_set) {
3127 if (rdev->raid_disk < 0)
3129 if (rdev->new_raid_disk >= mddev->raid_disks)
3130 rdev->new_raid_disk = -1;
3131 if (rdev->new_raid_disk == rdev->raid_disk)
3133 sprintf(nm, "rd%d", rdev->raid_disk);
3134 sysfs_remove_link(&mddev->kobj, nm);
3136 list_for_each_entry(rdev, &mddev->disks, same_set) {
3137 if (rdev->raid_disk < 0)
3139 if (rdev->new_raid_disk == rdev->raid_disk)
3141 rdev->raid_disk = rdev->new_raid_disk;
3142 if (rdev->raid_disk < 0)
3143 clear_bit(In_sync, &rdev->flags);
3146 sprintf(nm, "rd%d", rdev->raid_disk);
3147 if(sysfs_create_link(&mddev->kobj, &rdev->kobj, nm))
3148 printk("md: cannot register %s for %s after level change\n",
3153 module_put(mddev->pers->owner);
3155 mddev->private = priv;
3156 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
3157 mddev->level = mddev->new_level;
3158 mddev->layout = mddev->new_layout;
3159 mddev->chunk_sectors = mddev->new_chunk_sectors;
3160 mddev->delta_disks = 0;
3161 if (mddev->pers->sync_request == NULL) {
3162 /* this is now an array without redundancy, so
3163 * it must always be in_sync
3166 del_timer_sync(&mddev->safemode_timer);
3169 mddev_resume(mddev);
3170 set_bit(MD_CHANGE_DEVS, &mddev->flags);
3171 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3172 md_wakeup_thread(mddev->thread);
3173 sysfs_notify(&mddev->kobj, NULL, "level");
3174 md_new_event(mddev);
3178 static struct md_sysfs_entry md_level =
3179 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
3183 layout_show(mddev_t *mddev, char *page)
3185 /* just a number, not meaningful for all levels */
3186 if (mddev->reshape_position != MaxSector &&
3187 mddev->layout != mddev->new_layout)
3188 return sprintf(page, "%d (%d)\n",
3189 mddev->new_layout, mddev->layout);
3190 return sprintf(page, "%d\n", mddev->layout);
3194 layout_store(mddev_t *mddev, const char *buf, size_t len)
3197 unsigned long n = simple_strtoul(buf, &e, 10);
3199 if (!*buf || (*e && *e != '\n'))
3204 if (mddev->pers->check_reshape == NULL)
3206 mddev->new_layout = n;
3207 err = mddev->pers->check_reshape(mddev);
3209 mddev->new_layout = mddev->layout;
3213 mddev->new_layout = n;
3214 if (mddev->reshape_position == MaxSector)
3219 static struct md_sysfs_entry md_layout =
3220 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
3224 raid_disks_show(mddev_t *mddev, char *page)
3226 if (mddev->raid_disks == 0)
3228 if (mddev->reshape_position != MaxSector &&
3229 mddev->delta_disks != 0)
3230 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
3231 mddev->raid_disks - mddev->delta_disks);
3232 return sprintf(page, "%d\n", mddev->raid_disks);
3235 static int update_raid_disks(mddev_t *mddev, int raid_disks);
3238 raid_disks_store(mddev_t *mddev, const char *buf, size_t len)
3242 unsigned long n = simple_strtoul(buf, &e, 10);
3244 if (!*buf || (*e && *e != '\n'))
3248 rv = update_raid_disks(mddev, n);
3249 else if (mddev->reshape_position != MaxSector) {
3250 int olddisks = mddev->raid_disks - mddev->delta_disks;
3251 mddev->delta_disks = n - olddisks;
3252 mddev->raid_disks = n;
3254 mddev->raid_disks = n;
3255 return rv ? rv : len;
3257 static struct md_sysfs_entry md_raid_disks =
3258 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
3261 chunk_size_show(mddev_t *mddev, char *page)
3263 if (mddev->reshape_position != MaxSector &&
3264 mddev->chunk_sectors != mddev->new_chunk_sectors)
3265 return sprintf(page, "%d (%d)\n",
3266 mddev->new_chunk_sectors << 9,
3267 mddev->chunk_sectors << 9);
3268 return sprintf(page, "%d\n", mddev->chunk_sectors << 9);
3272 chunk_size_store(mddev_t *mddev, const char *buf, size_t len)
3275 unsigned long n = simple_strtoul(buf, &e, 10);
3277 if (!*buf || (*e && *e != '\n'))
3282 if (mddev->pers->check_reshape == NULL)
3284 mddev->new_chunk_sectors = n >> 9;
3285 err = mddev->pers->check_reshape(mddev);
3287 mddev->new_chunk_sectors = mddev->chunk_sectors;
3291 mddev->new_chunk_sectors = n >> 9;
3292 if (mddev->reshape_position == MaxSector)
3293 mddev->chunk_sectors = n >> 9;
3297 static struct md_sysfs_entry md_chunk_size =
3298 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
3301 resync_start_show(mddev_t *mddev, char *page)
3303 if (mddev->recovery_cp == MaxSector)
3304 return sprintf(page, "none\n");
3305 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
3309 resync_start_store(mddev_t *mddev, const char *buf, size_t len)
3312 unsigned long long n = simple_strtoull(buf, &e, 10);
3316 if (cmd_match(buf, "none"))
3318 else if (!*buf || (*e && *e != '\n'))
3321 mddev->recovery_cp = n;
3324 static struct md_sysfs_entry md_resync_start =
3325 __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store);
3328 * The array state can be:
3331 * No devices, no size, no level
3332 * Equivalent to STOP_ARRAY ioctl
3334 * May have some settings, but array is not active
3335 * all IO results in error
3336 * When written, doesn't tear down array, but just stops it
3337 * suspended (not supported yet)
3338 * All IO requests will block. The array can be reconfigured.
3339 * Writing this, if accepted, will block until array is quiescent
3341 * no resync can happen. no superblocks get written.
3342 * write requests fail
3344 * like readonly, but behaves like 'clean' on a write request.
3346 * clean - no pending writes, but otherwise active.
3347 * When written to inactive array, starts without resync
3348 * If a write request arrives then
3349 * if metadata is known, mark 'dirty' and switch to 'active'.
3350 * if not known, block and switch to write-pending
3351 * If written to an active array that has pending writes, then fails.
3353 * fully active: IO and resync can be happening.
3354 * When written to inactive array, starts with resync
3357 * clean, but writes are blocked waiting for 'active' to be written.
3360 * like active, but no writes have been seen for a while (100msec).
3363 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
3364 write_pending, active_idle, bad_word};
3365 static char *array_states[] = {
3366 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3367 "write-pending", "active-idle", NULL };
3369 static int match_word(const char *word, char **list)
3372 for (n=0; list[n]; n++)
3373 if (cmd_match(word, list[n]))
3379 array_state_show(mddev_t *mddev, char *page)
3381 enum array_state st = inactive;
3394 else if (test_bit(MD_CHANGE_PENDING, &mddev->flags))
3396 else if (mddev->safemode)
3402 if (list_empty(&mddev->disks) &&
3403 mddev->raid_disks == 0 &&
3404 mddev->dev_sectors == 0)
3409 return sprintf(page, "%s\n", array_states[st]);
3412 static int do_md_stop(mddev_t * mddev, int ro, int is_open);
3413 static int md_set_readonly(mddev_t * mddev, int is_open);
3414 static int do_md_run(mddev_t * mddev);
3415 static int restart_array(mddev_t *mddev);
3418 array_state_store(mddev_t *mddev, const char *buf, size_t len)
3421 enum array_state st = match_word(buf, array_states);
3426 /* stopping an active array */
3427 if (atomic_read(&mddev->openers) > 0)
3429 err = do_md_stop(mddev, 0, 0);
3432 /* stopping an active array */
3434 if (atomic_read(&mddev->openers) > 0)
3436 err = do_md_stop(mddev, 2, 0);
3438 err = 0; /* already inactive */
3441 break; /* not supported yet */
3444 err = md_set_readonly(mddev, 0);
3447 set_disk_ro(mddev->gendisk, 1);
3448 err = do_md_run(mddev);
3454 err = md_set_readonly(mddev, 0);
3455 else if (mddev->ro == 1)
3456 err = restart_array(mddev);
3459 set_disk_ro(mddev->gendisk, 0);
3463 err = do_md_run(mddev);
3468 restart_array(mddev);
3469 spin_lock_irq(&mddev->write_lock);
3470 if (atomic_read(&mddev->writes_pending) == 0) {
3471 if (mddev->in_sync == 0) {
3473 if (mddev->safemode == 1)
3474 mddev->safemode = 0;
3475 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
3480 spin_unlock_irq(&mddev->write_lock);
3486 restart_array(mddev);
3487 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
3488 wake_up(&mddev->sb_wait);
3492 set_disk_ro(mddev->gendisk, 0);
3493 err = do_md_run(mddev);
3498 /* these cannot be set */
3504 sysfs_notify_dirent_safe(mddev->sysfs_state);
3508 static struct md_sysfs_entry md_array_state =
3509 __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
3512 max_corrected_read_errors_show(mddev_t *mddev, char *page) {
3513 return sprintf(page, "%d\n",
3514 atomic_read(&mddev->max_corr_read_errors));
3518 max_corrected_read_errors_store(mddev_t *mddev, const char *buf, size_t len)
3521 unsigned long n = simple_strtoul(buf, &e, 10);
3523 if (*buf && (*e == 0 || *e == '\n')) {
3524 atomic_set(&mddev->max_corr_read_errors, n);
3530 static struct md_sysfs_entry max_corr_read_errors =
3531 __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show,
3532 max_corrected_read_errors_store);
3535 null_show(mddev_t *mddev, char *page)
3541 new_dev_store(mddev_t *mddev, const char *buf, size_t len)
3543 /* buf must be %d:%d\n? giving major and minor numbers */
3544 /* The new device is added to the array.
3545 * If the array has a persistent superblock, we read the
3546 * superblock to initialise info and check validity.
3547 * Otherwise, only checking done is that in bind_rdev_to_array,
3548 * which mainly checks size.
3551 int major = simple_strtoul(buf, &e, 10);
3557 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
3559 minor = simple_strtoul(e+1, &e, 10);
3560 if (*e && *e != '\n')
3562 dev = MKDEV(major, minor);
3563 if (major != MAJOR(dev) ||
3564 minor != MINOR(dev))
3568 if (mddev->persistent) {
3569 rdev = md_import_device(dev, mddev->major_version,
3570 mddev->minor_version);
3571 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
3572 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
3573 mdk_rdev_t, same_set);
3574 err = super_types[mddev->major_version]
3575 .load_super(rdev, rdev0, mddev->minor_version);
3579 } else if (mddev->external)
3580 rdev = md_import_device(dev, -2, -1);
3582 rdev = md_import_device(dev, -1, -1);
3585 return PTR_ERR(rdev);
3586 err = bind_rdev_to_array(rdev, mddev);
3590 return err ? err : len;
3593 static struct md_sysfs_entry md_new_device =
3594 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
3597 bitmap_store(mddev_t *mddev, const char *buf, size_t len)
3600 unsigned long chunk, end_chunk;
3604 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
3606 chunk = end_chunk = simple_strtoul(buf, &end, 0);
3607 if (buf == end) break;
3608 if (*end == '-') { /* range */
3610 end_chunk = simple_strtoul(buf, &end, 0);
3611 if (buf == end) break;
3613 if (*end && !isspace(*end)) break;
3614 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
3615 buf = skip_spaces(end);
3617 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
3622 static struct md_sysfs_entry md_bitmap =
3623 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
3626 size_show(mddev_t *mddev, char *page)
3628 return sprintf(page, "%llu\n",
3629 (unsigned long long)mddev->dev_sectors / 2);
3632 static int update_size(mddev_t *mddev, sector_t num_sectors);
3635 size_store(mddev_t *mddev, const char *buf, size_t len)
3637 /* If array is inactive, we can reduce the component size, but
3638 * not increase it (except from 0).
3639 * If array is active, we can try an on-line resize
3642 int err = strict_blocks_to_sectors(buf, §ors);
3647 err = update_size(mddev, sectors);
3648 md_update_sb(mddev, 1);
3650 if (mddev->dev_sectors == 0 ||
3651 mddev->dev_sectors > sectors)
3652 mddev->dev_sectors = sectors;
3656 return err ? err : len;
3659 static struct md_sysfs_entry md_size =
3660 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
3665 * 'none' for arrays with no metadata (good luck...)
3666 * 'external' for arrays with externally managed metadata,
3667 * or N.M for internally known formats
3670 metadata_show(mddev_t *mddev, char *page)
3672 if (mddev->persistent)
3673 return sprintf(page, "%d.%d\n",
3674 mddev->major_version, mddev->minor_version);
3675 else if (mddev->external)
3676 return sprintf(page, "external:%s\n", mddev->metadata_type);
3678 return sprintf(page, "none\n");
3682 metadata_store(mddev_t *mddev, const char *buf, size_t len)
3686 /* Changing the details of 'external' metadata is
3687 * always permitted. Otherwise there must be
3688 * no devices attached to the array.
3690 if (mddev->external && strncmp(buf, "external:", 9) == 0)
3692 else if (!list_empty(&mddev->disks))
3695 if (cmd_match(buf, "none")) {
3696 mddev->persistent = 0;
3697 mddev->external = 0;
3698 mddev->major_version = 0;
3699 mddev->minor_version = 90;
3702 if (strncmp(buf, "external:", 9) == 0) {
3703 size_t namelen = len-9;
3704 if (namelen >= sizeof(mddev->metadata_type))
3705 namelen = sizeof(mddev->metadata_type)-1;
3706 strncpy(mddev->metadata_type, buf+9, namelen);
3707 mddev->metadata_type[namelen] = 0;
3708 if (namelen && mddev->metadata_type[namelen-1] == '\n')
3709 mddev->metadata_type[--namelen] = 0;
3710 mddev->persistent = 0;
3711 mddev->external = 1;
3712 mddev->major_version = 0;
3713 mddev->minor_version = 90;
3716 major = simple_strtoul(buf, &e, 10);
3717 if (e==buf || *e != '.')
3720 minor = simple_strtoul(buf, &e, 10);
3721 if (e==buf || (*e && *e != '\n') )
3723 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
3725 mddev->major_version = major;
3726 mddev->minor_version = minor;
3727 mddev->persistent = 1;
3728 mddev->external = 0;
3732 static struct md_sysfs_entry md_metadata =
3733 __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
3736 action_show(mddev_t *mddev, char *page)
3738 char *type = "idle";
3739 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
3741 else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3742 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) {
3743 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
3745 else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
3746 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
3748 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
3752 } else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
3755 return sprintf(page, "%s\n", type);
3758 static void reap_sync_thread(mddev_t *mddev);
3761 action_store(mddev_t *mddev, const char *page, size_t len)
3763 if (!mddev->pers || !mddev->pers->sync_request)
3766 if (cmd_match(page, "frozen"))
3767 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3769 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3771 if (cmd_match(page, "idle") || cmd_match(page, "frozen")) {
3772 if (mddev->sync_thread) {
3773 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
3774 reap_sync_thread(mddev);
3776 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3777 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
3779 else if (cmd_match(page, "resync"))
3780 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3781 else if (cmd_match(page, "recover")) {
3782 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
3783 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3784 } else if (cmd_match(page, "reshape")) {
3786 if (mddev->pers->start_reshape == NULL)
3788 err = mddev->pers->start_reshape(mddev);
3791 sysfs_notify(&mddev->kobj, NULL, "degraded");
3793 if (cmd_match(page, "check"))
3794 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
3795 else if (!cmd_match(page, "repair"))
3797 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
3798 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
3800 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3801 md_wakeup_thread(mddev->thread);
3802 sysfs_notify_dirent_safe(mddev->sysfs_action);
3807 mismatch_cnt_show(mddev_t *mddev, char *page)
3809 return sprintf(page, "%llu\n",
3810 (unsigned long long) mddev->resync_mismatches);
3813 static struct md_sysfs_entry md_scan_mode =
3814 __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
3817 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
3820 sync_min_show(mddev_t *mddev, char *page)
3822 return sprintf(page, "%d (%s)\n", speed_min(mddev),
3823 mddev->sync_speed_min ? "local": "system");
3827 sync_min_store(mddev_t *mddev, const char *buf, size_t len)
3831 if (strncmp(buf, "system", 6)==0) {
3832 mddev->sync_speed_min = 0;
3835 min = simple_strtoul(buf, &e, 10);
3836 if (buf == e || (*e && *e != '\n') || min <= 0)
3838 mddev->sync_speed_min = min;
3842 static struct md_sysfs_entry md_sync_min =
3843 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
3846 sync_max_show(mddev_t *mddev, char *page)
3848 return sprintf(page, "%d (%s)\n", speed_max(mddev),
3849 mddev->sync_speed_max ? "local": "system");
3853 sync_max_store(mddev_t *mddev, const char *buf, size_t len)
3857 if (strncmp(buf, "system", 6)==0) {
3858 mddev->sync_speed_max = 0;
3861 max = simple_strtoul(buf, &e, 10);
3862 if (buf == e || (*e && *e != '\n') || max <= 0)
3864 mddev->sync_speed_max = max;
3868 static struct md_sysfs_entry md_sync_max =
3869 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
3872 degraded_show(mddev_t *mddev, char *page)
3874 return sprintf(page, "%d\n", mddev->degraded);
3876 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
3879 sync_force_parallel_show(mddev_t *mddev, char *page)
3881 return sprintf(page, "%d\n", mddev->parallel_resync);
3885 sync_force_parallel_store(mddev_t *mddev, const char *buf, size_t len)
3889 if (strict_strtol(buf, 10, &n))
3892 if (n != 0 && n != 1)
3895 mddev->parallel_resync = n;
3897 if (mddev->sync_thread)
3898 wake_up(&resync_wait);
3903 /* force parallel resync, even with shared block devices */
3904 static struct md_sysfs_entry md_sync_force_parallel =
3905 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
3906 sync_force_parallel_show, sync_force_parallel_store);
3909 sync_speed_show(mddev_t *mddev, char *page)
3911 unsigned long resync, dt, db;
3912 if (mddev->curr_resync == 0)
3913 return sprintf(page, "none\n");
3914 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
3915 dt = (jiffies - mddev->resync_mark) / HZ;
3917 db = resync - mddev->resync_mark_cnt;
3918 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
3921 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
3924 sync_completed_show(mddev_t *mddev, char *page)
3926 unsigned long long max_sectors, resync;
3928 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3929 return sprintf(page, "none\n");
3931 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
3932 max_sectors = mddev->resync_max_sectors;
3934 max_sectors = mddev->dev_sectors;
3936 resync = mddev->curr_resync_completed;
3937 return sprintf(page, "%llu / %llu\n", resync, max_sectors);
3940 static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed);
3943 min_sync_show(mddev_t *mddev, char *page)
3945 return sprintf(page, "%llu\n",
3946 (unsigned long long)mddev->resync_min);
3949 min_sync_store(mddev_t *mddev, const char *buf, size_t len)
3951 unsigned long long min;
3952 if (strict_strtoull(buf, 10, &min))
3954 if (min > mddev->resync_max)
3956 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3959 /* Must be a multiple of chunk_size */
3960 if (mddev->chunk_sectors) {
3961 sector_t temp = min;
3962 if (sector_div(temp, mddev->chunk_sectors))
3965 mddev->resync_min = min;
3970 static struct md_sysfs_entry md_min_sync =
3971 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
3974 max_sync_show(mddev_t *mddev, char *page)
3976 if (mddev->resync_max == MaxSector)
3977 return sprintf(page, "max\n");
3979 return sprintf(page, "%llu\n",
3980 (unsigned long long)mddev->resync_max);
3983 max_sync_store(mddev_t *mddev, const char *buf, size_t len)
3985 if (strncmp(buf, "max", 3) == 0)
3986 mddev->resync_max = MaxSector;
3988 unsigned long long max;
3989 if (strict_strtoull(buf, 10, &max))
3991 if (max < mddev->resync_min)
3993 if (max < mddev->resync_max &&
3995 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3998 /* Must be a multiple of chunk_size */
3999 if (mddev->chunk_sectors) {
4000 sector_t temp = max;
4001 if (sector_div(temp, mddev->chunk_sectors))
4004 mddev->resync_max = max;
4006 wake_up(&mddev->recovery_wait);
4010 static struct md_sysfs_entry md_max_sync =
4011 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
4014 suspend_lo_show(mddev_t *mddev, char *page)
4016 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
4020 suspend_lo_store(mddev_t *mddev, const char *buf, size_t len)
4023 unsigned long long new = simple_strtoull(buf, &e, 10);
4024 unsigned long long old = mddev->suspend_lo;
4026 if (mddev->pers == NULL ||
4027 mddev->pers->quiesce == NULL)
4029 if (buf == e || (*e && *e != '\n'))
4032 mddev->suspend_lo = new;
4034 /* Shrinking suspended region */
4035 mddev->pers->quiesce(mddev, 2);
4037 /* Expanding suspended region - need to wait */
4038 mddev->pers->quiesce(mddev, 1);
4039 mddev->pers->quiesce(mddev, 0);
4043 static struct md_sysfs_entry md_suspend_lo =
4044 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
4048 suspend_hi_show(mddev_t *mddev, char *page)
4050 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
4054 suspend_hi_store(mddev_t *mddev, const char *buf, size_t len)
4057 unsigned long long new = simple_strtoull(buf, &e, 10);
4058 unsigned long long old = mddev->suspend_hi;
4060 if (mddev->pers == NULL ||
4061 mddev->pers->quiesce == NULL)
4063 if (buf == e || (*e && *e != '\n'))
4066 mddev->suspend_hi = new;
4068 /* Shrinking suspended region */
4069 mddev->pers->quiesce(mddev, 2);
4071 /* Expanding suspended region - need to wait */
4072 mddev->pers->quiesce(mddev, 1);
4073 mddev->pers->quiesce(mddev, 0);
4077 static struct md_sysfs_entry md_suspend_hi =
4078 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
4081 reshape_position_show(mddev_t *mddev, char *page)
4083 if (mddev->reshape_position != MaxSector)
4084 return sprintf(page, "%llu\n",
4085 (unsigned long long)mddev->reshape_position);
4086 strcpy(page, "none\n");
4091 reshape_position_store(mddev_t *mddev, const char *buf, size_t len)
4094 unsigned long long new = simple_strtoull(buf, &e, 10);
4097 if (buf == e || (*e && *e != '\n'))
4099 mddev->reshape_position = new;
4100 mddev->delta_disks = 0;
4101 mddev->new_level = mddev->level;
4102 mddev->new_layout = mddev->layout;
4103 mddev->new_chunk_sectors = mddev->chunk_sectors;
4107 static struct md_sysfs_entry md_reshape_position =
4108 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
4109 reshape_position_store);
4112 array_size_show(mddev_t *mddev, char *page)
4114 if (mddev->external_size)
4115 return sprintf(page, "%llu\n",
4116 (unsigned long long)mddev->array_sectors/2);
4118 return sprintf(page, "default\n");
4122 array_size_store(mddev_t *mddev, const char *buf, size_t len)
4126 if (strncmp(buf, "default", 7) == 0) {
4128 sectors = mddev->pers->size(mddev, 0, 0);
4130 sectors = mddev->array_sectors;
4132 mddev->external_size = 0;
4134 if (strict_blocks_to_sectors(buf, §ors) < 0)
4136 if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors)
4139 mddev->external_size = 1;
4142 mddev->array_sectors = sectors;
4143 set_capacity(mddev->gendisk, mddev->array_sectors);
4145 revalidate_disk(mddev->gendisk);
4150 static struct md_sysfs_entry md_array_size =
4151 __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show,
4154 static struct attribute *md_default_attrs[] = {
4157 &md_raid_disks.attr,
4158 &md_chunk_size.attr,
4160 &md_resync_start.attr,
4162 &md_new_device.attr,
4163 &md_safe_delay.attr,
4164 &md_array_state.attr,
4165 &md_reshape_position.attr,
4166 &md_array_size.attr,
4167 &max_corr_read_errors.attr,
4171 static struct attribute *md_redundancy_attrs[] = {
4173 &md_mismatches.attr,
4176 &md_sync_speed.attr,
4177 &md_sync_force_parallel.attr,
4178 &md_sync_completed.attr,
4181 &md_suspend_lo.attr,
4182 &md_suspend_hi.attr,
4187 static struct attribute_group md_redundancy_group = {
4189 .attrs = md_redundancy_attrs,
4194 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
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 rv = mddev_lock(mddev);
4204 rv = entry->show(mddev, page);
4205 mddev_unlock(mddev);
4211 md_attr_store(struct kobject *kobj, struct attribute *attr,
4212 const char *page, size_t length)
4214 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
4215 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
4220 if (!capable(CAP_SYS_ADMIN))
4222 rv = mddev_lock(mddev);
4223 if (mddev->hold_active == UNTIL_IOCTL)
4224 mddev->hold_active = 0;
4226 rv = entry->store(mddev, page, length);
4227 mddev_unlock(mddev);
4232 static void md_free(struct kobject *ko)
4234 mddev_t *mddev = container_of(ko, mddev_t, kobj);
4236 if (mddev->sysfs_state)
4237 sysfs_put(mddev->sysfs_state);
4239 if (mddev->gendisk) {
4240 del_gendisk(mddev->gendisk);
4241 put_disk(mddev->gendisk);
4244 blk_cleanup_queue(mddev->queue);
4249 static const struct sysfs_ops md_sysfs_ops = {
4250 .show = md_attr_show,
4251 .store = md_attr_store,
4253 static struct kobj_type md_ktype = {
4255 .sysfs_ops = &md_sysfs_ops,
4256 .default_attrs = md_default_attrs,
4261 static void mddev_delayed_delete(struct work_struct *ws)
4263 mddev_t *mddev = container_of(ws, mddev_t, del_work);
4265 sysfs_remove_group(&mddev->kobj, &md_bitmap_group);
4266 kobject_del(&mddev->kobj);
4267 kobject_put(&mddev->kobj);
4270 static int md_alloc(dev_t dev, char *name)
4272 static DEFINE_MUTEX(disks_mutex);
4273 mddev_t *mddev = mddev_find(dev);
4274 struct gendisk *disk;
4283 partitioned = (MAJOR(mddev->unit) != MD_MAJOR);
4284 shift = partitioned ? MdpMinorShift : 0;
4285 unit = MINOR(mddev->unit) >> shift;
4287 /* wait for any previous instance of this device to be
4288 * completely removed (mddev_delayed_delete).
4290 flush_workqueue(md_misc_wq);
4292 mutex_lock(&disks_mutex);
4298 /* Need to ensure that 'name' is not a duplicate.
4301 spin_lock(&all_mddevs_lock);
4303 list_for_each_entry(mddev2, &all_mddevs, all_mddevs)
4304 if (mddev2->gendisk &&
4305 strcmp(mddev2->gendisk->disk_name, name) == 0) {
4306 spin_unlock(&all_mddevs_lock);
4309 spin_unlock(&all_mddevs_lock);
4313 mddev->queue = blk_alloc_queue(GFP_KERNEL);
4316 mddev->queue->queuedata = mddev;
4318 blk_queue_make_request(mddev->queue, md_make_request);
4320 disk = alloc_disk(1 << shift);
4322 blk_cleanup_queue(mddev->queue);
4323 mddev->queue = NULL;
4326 disk->major = MAJOR(mddev->unit);
4327 disk->first_minor = unit << shift;
4329 strcpy(disk->disk_name, name);
4330 else if (partitioned)
4331 sprintf(disk->disk_name, "md_d%d", unit);
4333 sprintf(disk->disk_name, "md%d", unit);
4334 disk->fops = &md_fops;
4335 disk->private_data = mddev;
4336 disk->queue = mddev->queue;
4337 /* Allow extended partitions. This makes the
4338 * 'mdp' device redundant, but we can't really
4341 disk->flags |= GENHD_FL_EXT_DEVT;
4343 mddev->gendisk = disk;
4344 error = kobject_init_and_add(&mddev->kobj, &md_ktype,
4345 &disk_to_dev(disk)->kobj, "%s", "md");
4347 /* This isn't possible, but as kobject_init_and_add is marked
4348 * __must_check, we must do something with the result
4350 printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
4354 if (mddev->kobj.sd &&
4355 sysfs_create_group(&mddev->kobj, &md_bitmap_group))
4356 printk(KERN_DEBUG "pointless warning\n");
4358 blk_queue_flush(mddev->queue, REQ_FLUSH | REQ_FUA);
4360 mutex_unlock(&disks_mutex);
4361 if (!error && mddev->kobj.sd) {
4362 kobject_uevent(&mddev->kobj, KOBJ_ADD);
4363 mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state");
4369 static struct kobject *md_probe(dev_t dev, int *part, void *data)
4371 md_alloc(dev, NULL);
4375 static int add_named_array(const char *val, struct kernel_param *kp)
4377 /* val must be "md_*" where * is not all digits.
4378 * We allocate an array with a large free minor number, and
4379 * set the name to val. val must not already be an active name.
4381 int len = strlen(val);
4382 char buf[DISK_NAME_LEN];
4384 while (len && val[len-1] == '\n')
4386 if (len >= DISK_NAME_LEN)
4388 strlcpy(buf, val, len+1);
4389 if (strncmp(buf, "md_", 3) != 0)
4391 return md_alloc(0, buf);
4394 static void md_safemode_timeout(unsigned long data)
4396 mddev_t *mddev = (mddev_t *) data;
4398 if (!atomic_read(&mddev->writes_pending)) {
4399 mddev->safemode = 1;
4400 if (mddev->external)
4401 sysfs_notify_dirent_safe(mddev->sysfs_state);
4403 md_wakeup_thread(mddev->thread);
4406 static int start_dirty_degraded;
4408 int md_run(mddev_t *mddev)
4412 struct mdk_personality *pers;
4414 if (list_empty(&mddev->disks))
4415 /* cannot run an array with no devices.. */
4420 /* Cannot run until previous stop completes properly */
4421 if (mddev->sysfs_active)
4425 * Analyze all RAID superblock(s)
4427 if (!mddev->raid_disks) {
4428 if (!mddev->persistent)
4433 if (mddev->level != LEVEL_NONE)
4434 request_module("md-level-%d", mddev->level);
4435 else if (mddev->clevel[0])
4436 request_module("md-%s", mddev->clevel);
4439 * Drop all container device buffers, from now on
4440 * the only valid external interface is through the md
4443 list_for_each_entry(rdev, &mddev->disks, same_set) {
4444 if (test_bit(Faulty, &rdev->flags))
4446 sync_blockdev(rdev->bdev);
4447 invalidate_bdev(rdev->bdev);
4449 /* perform some consistency tests on the device.
4450 * We don't want the data to overlap the metadata,
4451 * Internal Bitmap issues have been handled elsewhere.
4453 if (rdev->meta_bdev) {
4454 /* Nothing to check */;
4455 } else if (rdev->data_offset < rdev->sb_start) {
4456 if (mddev->dev_sectors &&
4457 rdev->data_offset + mddev->dev_sectors
4459 printk("md: %s: data overlaps metadata\n",
4464 if (rdev->sb_start + rdev->sb_size/512
4465 > rdev->data_offset) {
4466 printk("md: %s: metadata overlaps data\n",
4471 sysfs_notify_dirent_safe(rdev->sysfs_state);
4474 if (mddev->bio_set == NULL)
4475 mddev->bio_set = bioset_create(BIO_POOL_SIZE, sizeof(mddev));
4477 spin_lock(&pers_lock);
4478 pers = find_pers(mddev->level, mddev->clevel);
4479 if (!pers || !try_module_get(pers->owner)) {
4480 spin_unlock(&pers_lock);
4481 if (mddev->level != LEVEL_NONE)
4482 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
4485 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
4490 spin_unlock(&pers_lock);
4491 if (mddev->level != pers->level) {
4492 mddev->level = pers->level;
4493 mddev->new_level = pers->level;
4495 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
4497 if (mddev->reshape_position != MaxSector &&
4498 pers->start_reshape == NULL) {
4499 /* This personality cannot handle reshaping... */
4501 module_put(pers->owner);
4505 if (pers->sync_request) {
4506 /* Warn if this is a potentially silly
4509 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
4513 list_for_each_entry(rdev, &mddev->disks, same_set)
4514 list_for_each_entry(rdev2, &mddev->disks, same_set) {
4516 rdev->bdev->bd_contains ==
4517 rdev2->bdev->bd_contains) {
4519 "%s: WARNING: %s appears to be"
4520 " on the same physical disk as"
4523 bdevname(rdev->bdev,b),
4524 bdevname(rdev2->bdev,b2));
4531 "True protection against single-disk"
4532 " failure might be compromised.\n");
4535 mddev->recovery = 0;
4536 /* may be over-ridden by personality */
4537 mddev->resync_max_sectors = mddev->dev_sectors;
4539 mddev->ok_start_degraded = start_dirty_degraded;
4541 if (start_readonly && mddev->ro == 0)
4542 mddev->ro = 2; /* read-only, but switch on first write */
4544 err = mddev->pers->run(mddev);
4546 printk(KERN_ERR "md: pers->run() failed ...\n");
4547 else if (mddev->pers->size(mddev, 0, 0) < mddev->array_sectors) {
4548 WARN_ONCE(!mddev->external_size, "%s: default size too small,"
4549 " but 'external_size' not in effect?\n", __func__);
4551 "md: invalid array_size %llu > default size %llu\n",
4552 (unsigned long long)mddev->array_sectors / 2,
4553 (unsigned long long)mddev->pers->size(mddev, 0, 0) / 2);
4555 mddev->pers->stop(mddev);
4557 if (err == 0 && mddev->pers->sync_request) {
4558 err = bitmap_create(mddev);
4560 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
4561 mdname(mddev), err);
4562 mddev->pers->stop(mddev);
4566 module_put(mddev->pers->owner);
4568 bitmap_destroy(mddev);
4571 if (mddev->pers->sync_request) {
4572 if (mddev->kobj.sd &&
4573 sysfs_create_group(&mddev->kobj, &md_redundancy_group))
4575 "md: cannot register extra attributes for %s\n",
4577 mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action");
4578 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
4581 atomic_set(&mddev->writes_pending,0);
4582 atomic_set(&mddev->max_corr_read_errors,
4583 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS);
4584 mddev->safemode = 0;
4585 mddev->safemode_timer.function = md_safemode_timeout;
4586 mddev->safemode_timer.data = (unsigned long) mddev;
4587 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
4591 list_for_each_entry(rdev, &mddev->disks, same_set)
4592 if (rdev->raid_disk >= 0) {
4594 sprintf(nm, "rd%d", rdev->raid_disk);
4595 if (sysfs_create_link(&mddev->kobj, &rdev->kobj, nm))
4596 /* failure here is OK */;
4599 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4602 md_update_sb(mddev, 0);
4604 md_wakeup_thread(mddev->thread);
4605 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
4607 md_new_event(mddev);
4608 sysfs_notify_dirent_safe(mddev->sysfs_state);
4609 sysfs_notify_dirent_safe(mddev->sysfs_action);
4610 sysfs_notify(&mddev->kobj, NULL, "degraded");
4613 EXPORT_SYMBOL_GPL(md_run);
4615 static int do_md_run(mddev_t *mddev)
4619 err = md_run(mddev);
4622 err = bitmap_load(mddev);
4624 bitmap_destroy(mddev);
4627 set_capacity(mddev->gendisk, mddev->array_sectors);
4628 revalidate_disk(mddev->gendisk);
4629 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
4634 static int restart_array(mddev_t *mddev)
4636 struct gendisk *disk = mddev->gendisk;
4638 /* Complain if it has no devices */
4639 if (list_empty(&mddev->disks))
4645 mddev->safemode = 0;
4647 set_disk_ro(disk, 0);
4648 printk(KERN_INFO "md: %s switched to read-write mode.\n",
4650 /* Kick recovery or resync if necessary */
4651 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4652 md_wakeup_thread(mddev->thread);
4653 md_wakeup_thread(mddev->sync_thread);
4654 sysfs_notify_dirent_safe(mddev->sysfs_state);
4658 /* similar to deny_write_access, but accounts for our holding a reference
4659 * to the file ourselves */
4660 static int deny_bitmap_write_access(struct file * file)
4662 struct inode *inode = file->f_mapping->host;
4664 spin_lock(&inode->i_lock);
4665 if (atomic_read(&inode->i_writecount) > 1) {
4666 spin_unlock(&inode->i_lock);
4669 atomic_set(&inode->i_writecount, -1);
4670 spin_unlock(&inode->i_lock);
4675 void restore_bitmap_write_access(struct file *file)
4677 struct inode *inode = file->f_mapping->host;
4679 spin_lock(&inode->i_lock);
4680 atomic_set(&inode->i_writecount, 1);
4681 spin_unlock(&inode->i_lock);
4684 static void md_clean(mddev_t *mddev)
4686 mddev->array_sectors = 0;
4687 mddev->external_size = 0;
4688 mddev->dev_sectors = 0;
4689 mddev->raid_disks = 0;
4690 mddev->recovery_cp = 0;
4691 mddev->resync_min = 0;
4692 mddev->resync_max = MaxSector;
4693 mddev->reshape_position = MaxSector;
4694 mddev->external = 0;
4695 mddev->persistent = 0;
4696 mddev->level = LEVEL_NONE;
4697 mddev->clevel[0] = 0;
4700 mddev->metadata_type[0] = 0;
4701 mddev->chunk_sectors = 0;
4702 mddev->ctime = mddev->utime = 0;
4704 mddev->max_disks = 0;
4706 mddev->can_decrease_events = 0;
4707 mddev->delta_disks = 0;
4708 mddev->new_level = LEVEL_NONE;
4709 mddev->new_layout = 0;
4710 mddev->new_chunk_sectors = 0;
4711 mddev->curr_resync = 0;
4712 mddev->resync_mismatches = 0;
4713 mddev->suspend_lo = mddev->suspend_hi = 0;
4714 mddev->sync_speed_min = mddev->sync_speed_max = 0;
4715 mddev->recovery = 0;
4717 mddev->degraded = 0;
4718 mddev->safemode = 0;
4719 mddev->bitmap_info.offset = 0;
4720 mddev->bitmap_info.default_offset = 0;
4721 mddev->bitmap_info.chunksize = 0;
4722 mddev->bitmap_info.daemon_sleep = 0;
4723 mddev->bitmap_info.max_write_behind = 0;
4727 static void __md_stop_writes(mddev_t *mddev)
4729 if (mddev->sync_thread) {
4730 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4731 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4732 reap_sync_thread(mddev);
4735 del_timer_sync(&mddev->safemode_timer);
4737 bitmap_flush(mddev);
4738 md_super_wait(mddev);
4740 if (!mddev->in_sync || mddev->flags) {
4741 /* mark array as shutdown cleanly */
4743 md_update_sb(mddev, 1);
4747 void md_stop_writes(mddev_t *mddev)
4750 __md_stop_writes(mddev);
4751 mddev_unlock(mddev);
4753 EXPORT_SYMBOL_GPL(md_stop_writes);
4755 void md_stop(mddev_t *mddev)
4758 mddev->pers->stop(mddev);
4759 if (mddev->pers->sync_request && mddev->to_remove == NULL)
4760 mddev->to_remove = &md_redundancy_group;
4761 module_put(mddev->pers->owner);
4763 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4765 EXPORT_SYMBOL_GPL(md_stop);
4767 static int md_set_readonly(mddev_t *mddev, int is_open)
4770 mutex_lock(&mddev->open_mutex);
4771 if (atomic_read(&mddev->openers) > is_open) {
4772 printk("md: %s still in use.\n",mdname(mddev));
4777 __md_stop_writes(mddev);
4783 set_disk_ro(mddev->gendisk, 1);
4784 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4785 sysfs_notify_dirent_safe(mddev->sysfs_state);
4789 mutex_unlock(&mddev->open_mutex);
4794 * 0 - completely stop and dis-assemble array
4795 * 2 - stop but do not disassemble array
4797 static int do_md_stop(mddev_t * mddev, int mode, int is_open)
4799 struct gendisk *disk = mddev->gendisk;
4802 mutex_lock(&mddev->open_mutex);
4803 if (atomic_read(&mddev->openers) > is_open ||
4804 mddev->sysfs_active) {
4805 printk("md: %s still in use.\n",mdname(mddev));
4806 mutex_unlock(&mddev->open_mutex);
4812 set_disk_ro(disk, 0);
4814 __md_stop_writes(mddev);
4816 mddev->queue->merge_bvec_fn = NULL;
4817 mddev->queue->unplug_fn = NULL;
4818 mddev->queue->backing_dev_info.congested_fn = NULL;
4820 /* tell userspace to handle 'inactive' */
4821 sysfs_notify_dirent_safe(mddev->sysfs_state);
4823 list_for_each_entry(rdev, &mddev->disks, same_set)
4824 if (rdev->raid_disk >= 0) {
4826 sprintf(nm, "rd%d", rdev->raid_disk);
4827 sysfs_remove_link(&mddev->kobj, nm);
4830 set_capacity(disk, 0);
4831 mutex_unlock(&mddev->open_mutex);
4832 revalidate_disk(disk);
4837 mutex_unlock(&mddev->open_mutex);
4839 * Free resources if final stop
4842 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
4844 bitmap_destroy(mddev);
4845 if (mddev->bitmap_info.file) {
4846 restore_bitmap_write_access(mddev->bitmap_info.file);
4847 fput(mddev->bitmap_info.file);
4848 mddev->bitmap_info.file = NULL;
4850 mddev->bitmap_info.offset = 0;
4852 export_array(mddev);
4855 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
4856 if (mddev->hold_active == UNTIL_STOP)
4857 mddev->hold_active = 0;
4859 blk_integrity_unregister(disk);
4860 md_new_event(mddev);
4861 sysfs_notify_dirent_safe(mddev->sysfs_state);
4866 static void autorun_array(mddev_t *mddev)
4871 if (list_empty(&mddev->disks))
4874 printk(KERN_INFO "md: running: ");
4876 list_for_each_entry(rdev, &mddev->disks, same_set) {
4877 char b[BDEVNAME_SIZE];
4878 printk("<%s>", bdevname(rdev->bdev,b));
4882 err = do_md_run(mddev);
4884 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
4885 do_md_stop(mddev, 0, 0);
4890 * lets try to run arrays based on all disks that have arrived
4891 * until now. (those are in pending_raid_disks)
4893 * the method: pick the first pending disk, collect all disks with
4894 * the same UUID, remove all from the pending list and put them into
4895 * the 'same_array' list. Then order this list based on superblock
4896 * update time (freshest comes first), kick out 'old' disks and
4897 * compare superblocks. If everything's fine then run it.
4899 * If "unit" is allocated, then bump its reference count
4901 static void autorun_devices(int part)
4903 mdk_rdev_t *rdev0, *rdev, *tmp;
4905 char b[BDEVNAME_SIZE];
4907 printk(KERN_INFO "md: autorun ...\n");
4908 while (!list_empty(&pending_raid_disks)) {
4911 LIST_HEAD(candidates);
4912 rdev0 = list_entry(pending_raid_disks.next,
4913 mdk_rdev_t, same_set);
4915 printk(KERN_INFO "md: considering %s ...\n",
4916 bdevname(rdev0->bdev,b));
4917 INIT_LIST_HEAD(&candidates);
4918 rdev_for_each_list(rdev, tmp, &pending_raid_disks)
4919 if (super_90_load(rdev, rdev0, 0) >= 0) {
4920 printk(KERN_INFO "md: adding %s ...\n",
4921 bdevname(rdev->bdev,b));
4922 list_move(&rdev->same_set, &candidates);
4925 * now we have a set of devices, with all of them having
4926 * mostly sane superblocks. It's time to allocate the
4930 dev = MKDEV(mdp_major,
4931 rdev0->preferred_minor << MdpMinorShift);
4932 unit = MINOR(dev) >> MdpMinorShift;
4934 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
4937 if (rdev0->preferred_minor != unit) {
4938 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
4939 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
4943 md_probe(dev, NULL, NULL);
4944 mddev = mddev_find(dev);
4945 if (!mddev || !mddev->gendisk) {
4949 "md: cannot allocate memory for md drive.\n");
4952 if (mddev_lock(mddev))
4953 printk(KERN_WARNING "md: %s locked, cannot run\n",
4955 else if (mddev->raid_disks || mddev->major_version
4956 || !list_empty(&mddev->disks)) {
4958 "md: %s already running, cannot run %s\n",
4959 mdname(mddev), bdevname(rdev0->bdev,b));
4960 mddev_unlock(mddev);
4962 printk(KERN_INFO "md: created %s\n", mdname(mddev));
4963 mddev->persistent = 1;
4964 rdev_for_each_list(rdev, tmp, &candidates) {
4965 list_del_init(&rdev->same_set);
4966 if (bind_rdev_to_array(rdev, mddev))
4969 autorun_array(mddev);
4970 mddev_unlock(mddev);
4972 /* on success, candidates will be empty, on error
4975 rdev_for_each_list(rdev, tmp, &candidates) {
4976 list_del_init(&rdev->same_set);
4981 printk(KERN_INFO "md: ... autorun DONE.\n");
4983 #endif /* !MODULE */
4985 static int get_version(void __user * arg)
4989 ver.major = MD_MAJOR_VERSION;
4990 ver.minor = MD_MINOR_VERSION;
4991 ver.patchlevel = MD_PATCHLEVEL_VERSION;
4993 if (copy_to_user(arg, &ver, sizeof(ver)))
4999 static int get_array_info(mddev_t * mddev, void __user * arg)
5001 mdu_array_info_t info;
5002 int nr,working,insync,failed,spare;
5005 nr=working=insync=failed=spare=0;
5006 list_for_each_entry(rdev, &mddev->disks, same_set) {
5008 if (test_bit(Faulty, &rdev->flags))
5012 if (test_bit(In_sync, &rdev->flags))
5019 info.major_version = mddev->major_version;
5020 info.minor_version = mddev->minor_version;
5021 info.patch_version = MD_PATCHLEVEL_VERSION;
5022 info.ctime = mddev->ctime;
5023 info.level = mddev->level;
5024 info.size = mddev->dev_sectors / 2;
5025 if (info.size != mddev->dev_sectors / 2) /* overflow */
5028 info.raid_disks = mddev->raid_disks;
5029 info.md_minor = mddev->md_minor;
5030 info.not_persistent= !mddev->persistent;
5032 info.utime = mddev->utime;
5035 info.state = (1<<MD_SB_CLEAN);
5036 if (mddev->bitmap && mddev->bitmap_info.offset)
5037 info.state = (1<<MD_SB_BITMAP_PRESENT);
5038 info.active_disks = insync;
5039 info.working_disks = working;
5040 info.failed_disks = failed;
5041 info.spare_disks = spare;
5043 info.layout = mddev->layout;
5044 info.chunk_size = mddev->chunk_sectors << 9;
5046 if (copy_to_user(arg, &info, sizeof(info)))
5052 static int get_bitmap_file(mddev_t * mddev, void __user * arg)
5054 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
5055 char *ptr, *buf = NULL;
5058 if (md_allow_write(mddev))
5059 file = kmalloc(sizeof(*file), GFP_NOIO);
5061 file = kmalloc(sizeof(*file), GFP_KERNEL);
5066 /* bitmap disabled, zero the first byte and copy out */
5067 if (!mddev->bitmap || !mddev->bitmap->file) {
5068 file->pathname[0] = '\0';
5072 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
5076 ptr = d_path(&mddev->bitmap->file->f_path, buf, sizeof(file->pathname));
5080 strcpy(file->pathname, ptr);
5084 if (copy_to_user(arg, file, sizeof(*file)))
5092 static int get_disk_info(mddev_t * mddev, void __user * arg)
5094 mdu_disk_info_t info;
5097 if (copy_from_user(&info, arg, sizeof(info)))
5100 rdev = find_rdev_nr(mddev, info.number);
5102 info.major = MAJOR(rdev->bdev->bd_dev);
5103 info.minor = MINOR(rdev->bdev->bd_dev);
5104 info.raid_disk = rdev->raid_disk;
5106 if (test_bit(Faulty, &rdev->flags))
5107 info.state |= (1<<MD_DISK_FAULTY);
5108 else if (test_bit(In_sync, &rdev->flags)) {
5109 info.state |= (1<<MD_DISK_ACTIVE);
5110 info.state |= (1<<MD_DISK_SYNC);
5112 if (test_bit(WriteMostly, &rdev->flags))
5113 info.state |= (1<<MD_DISK_WRITEMOSTLY);
5115 info.major = info.minor = 0;
5116 info.raid_disk = -1;
5117 info.state = (1<<MD_DISK_REMOVED);
5120 if (copy_to_user(arg, &info, sizeof(info)))
5126 static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
5128 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
5130 dev_t dev = MKDEV(info->major,info->minor);
5132 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
5135 if (!mddev->raid_disks) {
5137 /* expecting a device which has a superblock */
5138 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
5141 "md: md_import_device returned %ld\n",
5143 return PTR_ERR(rdev);
5145 if (!list_empty(&mddev->disks)) {
5146 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
5147 mdk_rdev_t, same_set);
5148 err = super_types[mddev->major_version]
5149 .load_super(rdev, rdev0, mddev->minor_version);
5152 "md: %s has different UUID to %s\n",
5153 bdevname(rdev->bdev,b),
5154 bdevname(rdev0->bdev,b2));
5159 err = bind_rdev_to_array(rdev, mddev);
5166 * add_new_disk can be used once the array is assembled
5167 * to add "hot spares". They must already have a superblock
5172 if (!mddev->pers->hot_add_disk) {
5174 "%s: personality does not support diskops!\n",
5178 if (mddev->persistent)
5179 rdev = md_import_device(dev, mddev->major_version,
5180 mddev->minor_version);
5182 rdev = md_import_device(dev, -1, -1);
5185 "md: md_import_device returned %ld\n",
5187 return PTR_ERR(rdev);
5189 /* set saved_raid_disk if appropriate */
5190 if (!mddev->persistent) {
5191 if (info->state & (1<<MD_DISK_SYNC) &&
5192 info->raid_disk < mddev->raid_disks) {
5193 rdev->raid_disk = info->raid_disk;
5194 set_bit(In_sync, &rdev->flags);
5196 rdev->raid_disk = -1;
5198 super_types[mddev->major_version].
5199 validate_super(mddev, rdev);
5200 if (test_bit(In_sync, &rdev->flags))
5201 rdev->saved_raid_disk = rdev->raid_disk;
5203 rdev->saved_raid_disk = -1;
5205 clear_bit(In_sync, &rdev->flags); /* just to be sure */
5206 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
5207 set_bit(WriteMostly, &rdev->flags);
5209 clear_bit(WriteMostly, &rdev->flags);
5211 rdev->raid_disk = -1;
5212 err = bind_rdev_to_array(rdev, mddev);
5213 if (!err && !mddev->pers->hot_remove_disk) {
5214 /* If there is hot_add_disk but no hot_remove_disk
5215 * then added disks for geometry changes,
5216 * and should be added immediately.
5218 super_types[mddev->major_version].
5219 validate_super(mddev, rdev);
5220 err = mddev->pers->hot_add_disk(mddev, rdev);
5222 unbind_rdev_from_array(rdev);
5227 sysfs_notify_dirent_safe(rdev->sysfs_state);
5229 md_update_sb(mddev, 1);
5230 if (mddev->degraded)
5231 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
5232 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5233 md_wakeup_thread(mddev->thread);
5237 /* otherwise, add_new_disk is only allowed
5238 * for major_version==0 superblocks
5240 if (mddev->major_version != 0) {
5241 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
5246 if (!(info->state & (1<<MD_DISK_FAULTY))) {
5248 rdev = md_import_device(dev, -1, 0);
5251 "md: error, md_import_device() returned %ld\n",
5253 return PTR_ERR(rdev);
5255 rdev->desc_nr = info->number;
5256 if (info->raid_disk < mddev->raid_disks)
5257 rdev->raid_disk = info->raid_disk;
5259 rdev->raid_disk = -1;
5261 if (rdev->raid_disk < mddev->raid_disks)
5262 if (info->state & (1<<MD_DISK_SYNC))
5263 set_bit(In_sync, &rdev->flags);
5265 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
5266 set_bit(WriteMostly, &rdev->flags);
5268 if (!mddev->persistent) {
5269 printk(KERN_INFO "md: nonpersistent superblock ...\n");
5270 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
5272 rdev->sb_start = calc_dev_sboffset(rdev);
5273 rdev->sectors = rdev->sb_start;
5275 err = bind_rdev_to_array(rdev, mddev);
5285 static int hot_remove_disk(mddev_t * mddev, dev_t dev)
5287 char b[BDEVNAME_SIZE];
5290 rdev = find_rdev(mddev, dev);
5294 if (rdev->raid_disk >= 0)
5297 kick_rdev_from_array(rdev);
5298 md_update_sb(mddev, 1);
5299 md_new_event(mddev);
5303 printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n",
5304 bdevname(rdev->bdev,b), mdname(mddev));
5308 static int hot_add_disk(mddev_t * mddev, dev_t dev)
5310 char b[BDEVNAME_SIZE];
5317 if (mddev->major_version != 0) {
5318 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
5319 " version-0 superblocks.\n",
5323 if (!mddev->pers->hot_add_disk) {
5325 "%s: personality does not support diskops!\n",
5330 rdev = md_import_device(dev, -1, 0);
5333 "md: error, md_import_device() returned %ld\n",
5338 if (mddev->persistent)
5339 rdev->sb_start = calc_dev_sboffset(rdev);
5341 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
5343 rdev->sectors = rdev->sb_start;
5345 if (test_bit(Faulty, &rdev->flags)) {
5347 "md: can not hot-add faulty %s disk to %s!\n",
5348 bdevname(rdev->bdev,b), mdname(mddev));
5352 clear_bit(In_sync, &rdev->flags);
5354 rdev->saved_raid_disk = -1;
5355 err = bind_rdev_to_array(rdev, mddev);
5360 * The rest should better be atomic, we can have disk failures
5361 * noticed in interrupt contexts ...
5364 rdev->raid_disk = -1;
5366 md_update_sb(mddev, 1);
5369 * Kick recovery, maybe this spare has to be added to the
5370 * array immediately.
5372 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5373 md_wakeup_thread(mddev->thread);
5374 md_new_event(mddev);
5382 static int set_bitmap_file(mddev_t *mddev, int fd)
5387 if (!mddev->pers->quiesce)
5389 if (mddev->recovery || mddev->sync_thread)
5391 /* we should be able to change the bitmap.. */
5397 return -EEXIST; /* cannot add when bitmap is present */
5398 mddev->bitmap_info.file = fget(fd);
5400 if (mddev->bitmap_info.file == NULL) {
5401 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
5406 err = deny_bitmap_write_access(mddev->bitmap_info.file);
5408 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
5410 fput(mddev->bitmap_info.file);
5411 mddev->bitmap_info.file = NULL;
5414 mddev->bitmap_info.offset = 0; /* file overrides offset */
5415 } else if (mddev->bitmap == NULL)
5416 return -ENOENT; /* cannot remove what isn't there */
5419 mddev->pers->quiesce(mddev, 1);
5421 err = bitmap_create(mddev);
5423 err = bitmap_load(mddev);
5425 if (fd < 0 || err) {
5426 bitmap_destroy(mddev);
5427 fd = -1; /* make sure to put the file */
5429 mddev->pers->quiesce(mddev, 0);
5432 if (mddev->bitmap_info.file) {
5433 restore_bitmap_write_access(mddev->bitmap_info.file);
5434 fput(mddev->bitmap_info.file);
5436 mddev->bitmap_info.file = NULL;
5443 * set_array_info is used two different ways
5444 * The original usage is when creating a new array.
5445 * In this usage, raid_disks is > 0 and it together with
5446 * level, size, not_persistent,layout,chunksize determine the
5447 * shape of the array.
5448 * This will always create an array with a type-0.90.0 superblock.
5449 * The newer usage is when assembling an array.
5450 * In this case raid_disks will be 0, and the major_version field is
5451 * use to determine which style super-blocks are to be found on the devices.
5452 * The minor and patch _version numbers are also kept incase the
5453 * super_block handler wishes to interpret them.
5455 static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
5458 if (info->raid_disks == 0) {
5459 /* just setting version number for superblock loading */
5460 if (info->major_version < 0 ||
5461 info->major_version >= ARRAY_SIZE(super_types) ||
5462 super_types[info->major_version].name == NULL) {
5463 /* maybe try to auto-load a module? */
5465 "md: superblock version %d not known\n",
5466 info->major_version);
5469 mddev->major_version = info->major_version;
5470 mddev->minor_version = info->minor_version;
5471 mddev->patch_version = info->patch_version;
5472 mddev->persistent = !info->not_persistent;
5473 /* ensure mddev_put doesn't delete this now that there
5474 * is some minimal configuration.
5476 mddev->ctime = get_seconds();
5479 mddev->major_version = MD_MAJOR_VERSION;
5480 mddev->minor_version = MD_MINOR_VERSION;
5481 mddev->patch_version = MD_PATCHLEVEL_VERSION;
5482 mddev->ctime = get_seconds();
5484 mddev->level = info->level;
5485 mddev->clevel[0] = 0;
5486 mddev->dev_sectors = 2 * (sector_t)info->size;
5487 mddev->raid_disks = info->raid_disks;
5488 /* don't set md_minor, it is determined by which /dev/md* was
5491 if (info->state & (1<<MD_SB_CLEAN))
5492 mddev->recovery_cp = MaxSector;
5494 mddev->recovery_cp = 0;
5495 mddev->persistent = ! info->not_persistent;
5496 mddev->external = 0;
5498 mddev->layout = info->layout;
5499 mddev->chunk_sectors = info->chunk_size >> 9;
5501 mddev->max_disks = MD_SB_DISKS;
5503 if (mddev->persistent)
5505 set_bit(MD_CHANGE_DEVS, &mddev->flags);
5507 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
5508 mddev->bitmap_info.offset = 0;
5510 mddev->reshape_position = MaxSector;
5513 * Generate a 128 bit UUID
5515 get_random_bytes(mddev->uuid, 16);
5517 mddev->new_level = mddev->level;
5518 mddev->new_chunk_sectors = mddev->chunk_sectors;
5519 mddev->new_layout = mddev->layout;
5520 mddev->delta_disks = 0;
5525 void md_set_array_sectors(mddev_t *mddev, sector_t array_sectors)
5527 WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__);
5529 if (mddev->external_size)
5532 mddev->array_sectors = array_sectors;
5534 EXPORT_SYMBOL(md_set_array_sectors);
5536 static int update_size(mddev_t *mddev, sector_t num_sectors)
5540 int fit = (num_sectors == 0);
5542 if (mddev->pers->resize == NULL)
5544 /* The "num_sectors" is the number of sectors of each device that
5545 * is used. This can only make sense for arrays with redundancy.
5546 * linear and raid0 always use whatever space is available. We can only
5547 * consider changing this number if no resync or reconstruction is
5548 * happening, and if the new size is acceptable. It must fit before the
5549 * sb_start or, if that is <data_offset, it must fit before the size
5550 * of each device. If num_sectors is zero, we find the largest size
5553 if (mddev->sync_thread)
5556 /* Sorry, cannot grow a bitmap yet, just remove it,
5560 list_for_each_entry(rdev, &mddev->disks, same_set) {
5561 sector_t avail = rdev->sectors;
5563 if (fit && (num_sectors == 0 || num_sectors > avail))
5564 num_sectors = avail;
5565 if (avail < num_sectors)
5568 rv = mddev->pers->resize(mddev, num_sectors);
5570 revalidate_disk(mddev->gendisk);
5574 static int update_raid_disks(mddev_t *mddev, int raid_disks)
5577 /* change the number of raid disks */
5578 if (mddev->pers->check_reshape == NULL)
5580 if (raid_disks <= 0 ||
5581 (mddev->max_disks && raid_disks >= mddev->max_disks))
5583 if (mddev->sync_thread || mddev->reshape_position != MaxSector)
5585 mddev->delta_disks = raid_disks - mddev->raid_disks;
5587 rv = mddev->pers->check_reshape(mddev);
5593 * update_array_info is used to change the configuration of an
5595 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
5596 * fields in the info are checked against the array.
5597 * Any differences that cannot be handled will cause an error.
5598 * Normally, only one change can be managed at a time.
5600 static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
5606 /* calculate expected state,ignoring low bits */
5607 if (mddev->bitmap && mddev->bitmap_info.offset)
5608 state |= (1 << MD_SB_BITMAP_PRESENT);
5610 if (mddev->major_version != info->major_version ||
5611 mddev->minor_version != info->minor_version ||
5612 /* mddev->patch_version != info->patch_version || */
5613 mddev->ctime != info->ctime ||
5614 mddev->level != info->level ||
5615 /* mddev->layout != info->layout || */
5616 !mddev->persistent != info->not_persistent||
5617 mddev->chunk_sectors != info->chunk_size >> 9 ||
5618 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
5619 ((state^info->state) & 0xfffffe00)
5622 /* Check there is only one change */
5623 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
5625 if (mddev->raid_disks != info->raid_disks)
5627 if (mddev->layout != info->layout)
5629 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT))
5636 if (mddev->layout != info->layout) {
5638 * we don't need to do anything at the md level, the
5639 * personality will take care of it all.
5641 if (mddev->pers->check_reshape == NULL)
5644 mddev->new_layout = info->layout;
5645 rv = mddev->pers->check_reshape(mddev);
5647 mddev->new_layout = mddev->layout;
5651 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
5652 rv = update_size(mddev, (sector_t)info->size * 2);
5654 if (mddev->raid_disks != info->raid_disks)
5655 rv = update_raid_disks(mddev, info->raid_disks);
5657 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
5658 if (mddev->pers->quiesce == NULL)
5660 if (mddev->recovery || mddev->sync_thread)
5662 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
5663 /* add the bitmap */
5666 if (mddev->bitmap_info.default_offset == 0)
5668 mddev->bitmap_info.offset =
5669 mddev->bitmap_info.default_offset;
5670 mddev->pers->quiesce(mddev, 1);
5671 rv = bitmap_create(mddev);
5673 rv = bitmap_load(mddev);
5675 bitmap_destroy(mddev);
5676 mddev->pers->quiesce(mddev, 0);
5678 /* remove the bitmap */
5681 if (mddev->bitmap->file)
5683 mddev->pers->quiesce(mddev, 1);
5684 bitmap_destroy(mddev);
5685 mddev->pers->quiesce(mddev, 0);
5686 mddev->bitmap_info.offset = 0;
5689 md_update_sb(mddev, 1);
5693 static int set_disk_faulty(mddev_t *mddev, dev_t dev)
5697 if (mddev->pers == NULL)
5700 rdev = find_rdev(mddev, dev);
5704 md_error(mddev, rdev);
5709 * We have a problem here : there is no easy way to give a CHS
5710 * virtual geometry. We currently pretend that we have a 2 heads
5711 * 4 sectors (with a BIG number of cylinders...). This drives
5712 * dosfs just mad... ;-)
5714 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
5716 mddev_t *mddev = bdev->bd_disk->private_data;
5720 geo->cylinders = mddev->array_sectors / 8;
5724 static int md_ioctl(struct block_device *bdev, fmode_t mode,
5725 unsigned int cmd, unsigned long arg)
5728 void __user *argp = (void __user *)arg;
5729 mddev_t *mddev = NULL;
5732 if (!capable(CAP_SYS_ADMIN))
5736 * Commands dealing with the RAID driver but not any
5742 err = get_version(argp);
5745 case PRINT_RAID_DEBUG:
5753 autostart_arrays(arg);
5760 * Commands creating/starting a new array:
5763 mddev = bdev->bd_disk->private_data;
5770 err = mddev_lock(mddev);
5773 "md: ioctl lock interrupted, reason %d, cmd %d\n",
5780 case SET_ARRAY_INFO:
5782 mdu_array_info_t info;
5784 memset(&info, 0, sizeof(info));
5785 else if (copy_from_user(&info, argp, sizeof(info))) {
5790 err = update_array_info(mddev, &info);
5792 printk(KERN_WARNING "md: couldn't update"
5793 " array info. %d\n", err);
5798 if (!list_empty(&mddev->disks)) {
5800 "md: array %s already has disks!\n",
5805 if (mddev->raid_disks) {
5807 "md: array %s already initialised!\n",
5812 err = set_array_info(mddev, &info);
5814 printk(KERN_WARNING "md: couldn't set"
5815 " array info. %d\n", err);
5825 * Commands querying/configuring an existing array:
5827 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
5828 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
5829 if ((!mddev->raid_disks && !mddev->external)
5830 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
5831 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
5832 && cmd != GET_BITMAP_FILE) {
5838 * Commands even a read-only array can execute:
5842 case GET_ARRAY_INFO:
5843 err = get_array_info(mddev, argp);
5846 case GET_BITMAP_FILE:
5847 err = get_bitmap_file(mddev, argp);
5851 err = get_disk_info(mddev, argp);
5854 case RESTART_ARRAY_RW:
5855 err = restart_array(mddev);
5859 err = do_md_stop(mddev, 0, 1);
5863 err = md_set_readonly(mddev, 1);
5867 if (get_user(ro, (int __user *)(arg))) {
5873 /* if the bdev is going readonly the value of mddev->ro
5874 * does not matter, no writes are coming
5879 /* are we are already prepared for writes? */
5883 /* transitioning to readauto need only happen for
5884 * arrays that call md_write_start
5887 err = restart_array(mddev);
5890 set_disk_ro(mddev->gendisk, 0);
5897 * The remaining ioctls are changing the state of the
5898 * superblock, so we do not allow them on read-only arrays.
5899 * However non-MD ioctls (e.g. get-size) will still come through
5900 * here and hit the 'default' below, so only disallow
5901 * 'md' ioctls, and switch to rw mode if started auto-readonly.
5903 if (_IOC_TYPE(cmd) == MD_MAJOR && mddev->ro && mddev->pers) {
5904 if (mddev->ro == 2) {
5906 sysfs_notify_dirent_safe(mddev->sysfs_state);
5907 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5908 md_wakeup_thread(mddev->thread);
5919 mdu_disk_info_t info;
5920 if (copy_from_user(&info, argp, sizeof(info)))
5923 err = add_new_disk(mddev, &info);
5927 case HOT_REMOVE_DISK:
5928 err = hot_remove_disk(mddev, new_decode_dev(arg));
5932 err = hot_add_disk(mddev, new_decode_dev(arg));
5935 case SET_DISK_FAULTY:
5936 err = set_disk_faulty(mddev, new_decode_dev(arg));
5940 err = do_md_run(mddev);
5943 case SET_BITMAP_FILE:
5944 err = set_bitmap_file(mddev, (int)arg);
5954 if (mddev->hold_active == UNTIL_IOCTL &&
5956 mddev->hold_active = 0;
5957 mddev_unlock(mddev);
5966 #ifdef CONFIG_COMPAT
5967 static int md_compat_ioctl(struct block_device *bdev, fmode_t mode,
5968 unsigned int cmd, unsigned long arg)
5971 case HOT_REMOVE_DISK:
5973 case SET_DISK_FAULTY:
5974 case SET_BITMAP_FILE:
5975 /* These take in integer arg, do not convert */
5978 arg = (unsigned long)compat_ptr(arg);
5982 return md_ioctl(bdev, mode, cmd, arg);
5984 #endif /* CONFIG_COMPAT */
5986 static int md_open(struct block_device *bdev, fmode_t mode)
5989 * Succeed if we can lock the mddev, which confirms that
5990 * it isn't being stopped right now.
5992 mddev_t *mddev = mddev_find(bdev->bd_dev);
5995 if (mddev->gendisk != bdev->bd_disk) {
5996 /* we are racing with mddev_put which is discarding this
6000 /* Wait until bdev->bd_disk is definitely gone */
6001 flush_workqueue(md_misc_wq);
6002 /* Then retry the open from the top */
6003 return -ERESTARTSYS;
6005 BUG_ON(mddev != bdev->bd_disk->private_data);
6007 if ((err = mutex_lock_interruptible(&mddev->open_mutex)))
6011 atomic_inc(&mddev->openers);
6012 mutex_unlock(&mddev->open_mutex);
6014 check_disk_size_change(mddev->gendisk, bdev);
6019 static int md_release(struct gendisk *disk, fmode_t mode)
6021 mddev_t *mddev = disk->private_data;
6024 atomic_dec(&mddev->openers);
6029 static const struct block_device_operations md_fops =
6031 .owner = THIS_MODULE,
6033 .release = md_release,
6035 #ifdef CONFIG_COMPAT
6036 .compat_ioctl = md_compat_ioctl,
6038 .getgeo = md_getgeo,
6041 static int md_thread(void * arg)
6043 mdk_thread_t *thread = arg;
6046 * md_thread is a 'system-thread', it's priority should be very
6047 * high. We avoid resource deadlocks individually in each
6048 * raid personality. (RAID5 does preallocation) We also use RR and
6049 * the very same RT priority as kswapd, thus we will never get
6050 * into a priority inversion deadlock.
6052 * we definitely have to have equal or higher priority than
6053 * bdflush, otherwise bdflush will deadlock if there are too
6054 * many dirty RAID5 blocks.
6057 allow_signal(SIGKILL);
6058 while (!kthread_should_stop()) {
6060 /* We need to wait INTERRUPTIBLE so that
6061 * we don't add to the load-average.
6062 * That means we need to be sure no signals are
6065 if (signal_pending(current))
6066 flush_signals(current);
6068 wait_event_interruptible_timeout
6070 test_bit(THREAD_WAKEUP, &thread->flags)
6071 || kthread_should_stop(),
6074 clear_bit(THREAD_WAKEUP, &thread->flags);
6075 if (!kthread_should_stop())
6076 thread->run(thread->mddev);
6082 void md_wakeup_thread(mdk_thread_t *thread)
6085 dprintk("md: waking up MD thread %s.\n", thread->tsk->comm);
6086 set_bit(THREAD_WAKEUP, &thread->flags);
6087 wake_up(&thread->wqueue);
6091 mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
6094 mdk_thread_t *thread;
6096 thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL);
6100 init_waitqueue_head(&thread->wqueue);
6103 thread->mddev = mddev;
6104 thread->timeout = MAX_SCHEDULE_TIMEOUT;
6105 thread->tsk = kthread_run(md_thread, thread,
6107 mdname(thread->mddev),
6108 name ?: mddev->pers->name);
6109 if (IS_ERR(thread->tsk)) {
6116 void md_unregister_thread(mdk_thread_t *thread)
6120 dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
6122 kthread_stop(thread->tsk);
6126 void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
6133 if (!rdev || test_bit(Faulty, &rdev->flags))
6136 if (mddev->external)
6137 set_bit(Blocked, &rdev->flags);
6139 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
6141 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
6142 __builtin_return_address(0),__builtin_return_address(1),
6143 __builtin_return_address(2),__builtin_return_address(3));
6147 if (!mddev->pers->error_handler)
6149 mddev->pers->error_handler(mddev,rdev);
6150 if (mddev->degraded)
6151 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6152 sysfs_notify_dirent_safe(rdev->sysfs_state);
6153 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6154 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6155 md_wakeup_thread(mddev->thread);
6156 if (mddev->event_work.func)
6157 queue_work(md_misc_wq, &mddev->event_work);
6158 md_new_event_inintr(mddev);
6161 /* seq_file implementation /proc/mdstat */
6163 static void status_unused(struct seq_file *seq)
6168 seq_printf(seq, "unused devices: ");
6170 list_for_each_entry(rdev, &pending_raid_disks, same_set) {
6171 char b[BDEVNAME_SIZE];
6173 seq_printf(seq, "%s ",
6174 bdevname(rdev->bdev,b));
6177 seq_printf(seq, "<none>");
6179 seq_printf(seq, "\n");
6183 static void status_resync(struct seq_file *seq, mddev_t * mddev)
6185 sector_t max_sectors, resync, res;
6186 unsigned long dt, db;
6189 unsigned int per_milli;
6191 resync = mddev->curr_resync - atomic_read(&mddev->recovery_active);
6193 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
6194 max_sectors = mddev->resync_max_sectors;
6196 max_sectors = mddev->dev_sectors;
6199 * Should not happen.
6205 /* Pick 'scale' such that (resync>>scale)*1000 will fit
6206 * in a sector_t, and (max_sectors>>scale) will fit in a
6207 * u32, as those are the requirements for sector_div.
6208 * Thus 'scale' must be at least 10
6211 if (sizeof(sector_t) > sizeof(unsigned long)) {
6212 while ( max_sectors/2 > (1ULL<<(scale+32)))
6215 res = (resync>>scale)*1000;
6216 sector_div(res, (u32)((max_sectors>>scale)+1));
6220 int i, x = per_milli/50, y = 20-x;
6221 seq_printf(seq, "[");
6222 for (i = 0; i < x; i++)
6223 seq_printf(seq, "=");
6224 seq_printf(seq, ">");
6225 for (i = 0; i < y; i++)
6226 seq_printf(seq, ".");
6227 seq_printf(seq, "] ");
6229 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
6230 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
6232 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
6234 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
6235 "resync" : "recovery"))),
6236 per_milli/10, per_milli % 10,
6237 (unsigned long long) resync/2,
6238 (unsigned long long) max_sectors/2);
6241 * dt: time from mark until now
6242 * db: blocks written from mark until now
6243 * rt: remaining time
6245 * rt is a sector_t, so could be 32bit or 64bit.
6246 * So we divide before multiply in case it is 32bit and close
6248 * We scale the divisor (db) by 32 to avoid loosing precision
6249 * near the end of resync when the number of remaining sectors
6251 * We then divide rt by 32 after multiplying by db to compensate.
6252 * The '+1' avoids division by zero if db is very small.
6254 dt = ((jiffies - mddev->resync_mark) / HZ);
6256 db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active))
6257 - mddev->resync_mark_cnt;
6259 rt = max_sectors - resync; /* number of remaining sectors */
6260 sector_div(rt, db/32+1);
6264 seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60,
6265 ((unsigned long)rt % 60)/6);
6267 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
6270 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
6272 struct list_head *tmp;
6282 spin_lock(&all_mddevs_lock);
6283 list_for_each(tmp,&all_mddevs)
6285 mddev = list_entry(tmp, mddev_t, all_mddevs);
6287 spin_unlock(&all_mddevs_lock);
6290 spin_unlock(&all_mddevs_lock);
6292 return (void*)2;/* tail */
6296 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
6298 struct list_head *tmp;
6299 mddev_t *next_mddev, *mddev = v;
6305 spin_lock(&all_mddevs_lock);
6307 tmp = all_mddevs.next;
6309 tmp = mddev->all_mddevs.next;
6310 if (tmp != &all_mddevs)
6311 next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs));
6313 next_mddev = (void*)2;
6316 spin_unlock(&all_mddevs_lock);
6324 static void md_seq_stop(struct seq_file *seq, void *v)
6328 if (mddev && v != (void*)1 && v != (void*)2)
6332 struct mdstat_info {
6336 static int md_seq_show(struct seq_file *seq, void *v)
6341 struct mdstat_info *mi = seq->private;
6342 struct bitmap *bitmap;
6344 if (v == (void*)1) {
6345 struct mdk_personality *pers;
6346 seq_printf(seq, "Personalities : ");
6347 spin_lock(&pers_lock);
6348 list_for_each_entry(pers, &pers_list, list)
6349 seq_printf(seq, "[%s] ", pers->name);
6351 spin_unlock(&pers_lock);
6352 seq_printf(seq, "\n");
6353 mi->event = atomic_read(&md_event_count);
6356 if (v == (void*)2) {
6361 if (mddev_lock(mddev) < 0)
6364 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
6365 seq_printf(seq, "%s : %sactive", mdname(mddev),
6366 mddev->pers ? "" : "in");
6369 seq_printf(seq, " (read-only)");
6371 seq_printf(seq, " (auto-read-only)");
6372 seq_printf(seq, " %s", mddev->pers->name);
6376 list_for_each_entry(rdev, &mddev->disks, same_set) {
6377 char b[BDEVNAME_SIZE];
6378 seq_printf(seq, " %s[%d]",
6379 bdevname(rdev->bdev,b), rdev->desc_nr);
6380 if (test_bit(WriteMostly, &rdev->flags))
6381 seq_printf(seq, "(W)");
6382 if (test_bit(Faulty, &rdev->flags)) {
6383 seq_printf(seq, "(F)");
6385 } else if (rdev->raid_disk < 0)
6386 seq_printf(seq, "(S)"); /* spare */
6387 sectors += rdev->sectors;
6390 if (!list_empty(&mddev->disks)) {
6392 seq_printf(seq, "\n %llu blocks",
6393 (unsigned long long)
6394 mddev->array_sectors / 2);
6396 seq_printf(seq, "\n %llu blocks",
6397 (unsigned long long)sectors / 2);
6399 if (mddev->persistent) {
6400 if (mddev->major_version != 0 ||
6401 mddev->minor_version != 90) {
6402 seq_printf(seq," super %d.%d",
6403 mddev->major_version,
6404 mddev->minor_version);
6406 } else if (mddev->external)
6407 seq_printf(seq, " super external:%s",
6408 mddev->metadata_type);
6410 seq_printf(seq, " super non-persistent");
6413 mddev->pers->status(seq, mddev);
6414 seq_printf(seq, "\n ");
6415 if (mddev->pers->sync_request) {
6416 if (mddev->curr_resync > 2) {
6417 status_resync(seq, mddev);
6418 seq_printf(seq, "\n ");
6419 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
6420 seq_printf(seq, "\tresync=DELAYED\n ");
6421 else if (mddev->recovery_cp < MaxSector)
6422 seq_printf(seq, "\tresync=PENDING\n ");
6425 seq_printf(seq, "\n ");
6427 if ((bitmap = mddev->bitmap)) {
6428 unsigned long chunk_kb;
6429 unsigned long flags;
6430 spin_lock_irqsave(&bitmap->lock, flags);
6431 chunk_kb = mddev->bitmap_info.chunksize >> 10;
6432 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
6434 bitmap->pages - bitmap->missing_pages,
6436 (bitmap->pages - bitmap->missing_pages)
6437 << (PAGE_SHIFT - 10),
6438 chunk_kb ? chunk_kb : mddev->bitmap_info.chunksize,
6439 chunk_kb ? "KB" : "B");
6441 seq_printf(seq, ", file: ");
6442 seq_path(seq, &bitmap->file->f_path, " \t\n");
6445 seq_printf(seq, "\n");
6446 spin_unlock_irqrestore(&bitmap->lock, flags);
6449 seq_printf(seq, "\n");
6451 mddev_unlock(mddev);
6456 static const struct seq_operations md_seq_ops = {
6457 .start = md_seq_start,
6458 .next = md_seq_next,
6459 .stop = md_seq_stop,
6460 .show = md_seq_show,
6463 static int md_seq_open(struct inode *inode, struct file *file)
6466 struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL);
6470 error = seq_open(file, &md_seq_ops);
6474 struct seq_file *p = file->private_data;
6476 mi->event = atomic_read(&md_event_count);
6481 static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
6483 struct seq_file *m = filp->private_data;
6484 struct mdstat_info *mi = m->private;
6487 poll_wait(filp, &md_event_waiters, wait);
6489 /* always allow read */
6490 mask = POLLIN | POLLRDNORM;
6492 if (mi->event != atomic_read(&md_event_count))
6493 mask |= POLLERR | POLLPRI;
6497 static const struct file_operations md_seq_fops = {
6498 .owner = THIS_MODULE,
6499 .open = md_seq_open,
6501 .llseek = seq_lseek,
6502 .release = seq_release_private,
6503 .poll = mdstat_poll,
6506 int register_md_personality(struct mdk_personality *p)
6508 spin_lock(&pers_lock);
6509 list_add_tail(&p->list, &pers_list);
6510 printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level);
6511 spin_unlock(&pers_lock);
6515 int unregister_md_personality(struct mdk_personality *p)
6517 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
6518 spin_lock(&pers_lock);
6519 list_del_init(&p->list);
6520 spin_unlock(&pers_lock);
6524 static int is_mddev_idle(mddev_t *mddev, int init)
6532 rdev_for_each_rcu(rdev, mddev) {
6533 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
6534 curr_events = (int)part_stat_read(&disk->part0, sectors[0]) +
6535 (int)part_stat_read(&disk->part0, sectors[1]) -
6536 atomic_read(&disk->sync_io);
6537 /* sync IO will cause sync_io to increase before the disk_stats
6538 * as sync_io is counted when a request starts, and
6539 * disk_stats is counted when it completes.
6540 * So resync activity will cause curr_events to be smaller than
6541 * when there was no such activity.
6542 * non-sync IO will cause disk_stat to increase without
6543 * increasing sync_io so curr_events will (eventually)
6544 * be larger than it was before. Once it becomes
6545 * substantially larger, the test below will cause
6546 * the array to appear non-idle, and resync will slow
6548 * If there is a lot of outstanding resync activity when
6549 * we set last_event to curr_events, then all that activity
6550 * completing might cause the array to appear non-idle
6551 * and resync will be slowed down even though there might
6552 * not have been non-resync activity. This will only
6553 * happen once though. 'last_events' will soon reflect
6554 * the state where there is little or no outstanding
6555 * resync requests, and further resync activity will
6556 * always make curr_events less than last_events.
6559 if (init || curr_events - rdev->last_events > 64) {
6560 rdev->last_events = curr_events;
6568 void md_done_sync(mddev_t *mddev, int blocks, int ok)
6570 /* another "blocks" (512byte) blocks have been synced */
6571 atomic_sub(blocks, &mddev->recovery_active);
6572 wake_up(&mddev->recovery_wait);
6574 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6575 md_wakeup_thread(mddev->thread);
6576 // stop recovery, signal do_sync ....
6581 /* md_write_start(mddev, bi)
6582 * If we need to update some array metadata (e.g. 'active' flag
6583 * in superblock) before writing, schedule a superblock update
6584 * and wait for it to complete.
6586 void md_write_start(mddev_t *mddev, struct bio *bi)
6589 if (bio_data_dir(bi) != WRITE)
6592 BUG_ON(mddev->ro == 1);
6593 if (mddev->ro == 2) {
6594 /* need to switch to read/write */
6596 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6597 md_wakeup_thread(mddev->thread);
6598 md_wakeup_thread(mddev->sync_thread);
6601 atomic_inc(&mddev->writes_pending);
6602 if (mddev->safemode == 1)
6603 mddev->safemode = 0;
6604 if (mddev->in_sync) {
6605 spin_lock_irq(&mddev->write_lock);
6606 if (mddev->in_sync) {
6608 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6609 set_bit(MD_CHANGE_PENDING, &mddev->flags);
6610 md_wakeup_thread(mddev->thread);
6613 spin_unlock_irq(&mddev->write_lock);
6616 sysfs_notify_dirent_safe(mddev->sysfs_state);
6617 wait_event(mddev->sb_wait,
6618 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
6621 void md_write_end(mddev_t *mddev)
6623 if (atomic_dec_and_test(&mddev->writes_pending)) {
6624 if (mddev->safemode == 2)
6625 md_wakeup_thread(mddev->thread);
6626 else if (mddev->safemode_delay)
6627 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
6631 /* md_allow_write(mddev)
6632 * Calling this ensures that the array is marked 'active' so that writes
6633 * may proceed without blocking. It is important to call this before
6634 * attempting a GFP_KERNEL allocation while holding the mddev lock.
6635 * Must be called with mddev_lock held.
6637 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
6638 * is dropped, so return -EAGAIN after notifying userspace.
6640 int md_allow_write(mddev_t *mddev)
6646 if (!mddev->pers->sync_request)
6649 spin_lock_irq(&mddev->write_lock);
6650 if (mddev->in_sync) {
6652 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6653 set_bit(MD_CHANGE_PENDING, &mddev->flags);
6654 if (mddev->safemode_delay &&
6655 mddev->safemode == 0)
6656 mddev->safemode = 1;
6657 spin_unlock_irq(&mddev->write_lock);
6658 md_update_sb(mddev, 0);
6659 sysfs_notify_dirent_safe(mddev->sysfs_state);
6661 spin_unlock_irq(&mddev->write_lock);
6663 if (test_bit(MD_CHANGE_PENDING, &mddev->flags))
6668 EXPORT_SYMBOL_GPL(md_allow_write);
6670 void md_unplug(mddev_t *mddev)
6673 blk_unplug(mddev->queue);
6675 mddev->plug->unplug_fn(mddev->plug);
6678 #define SYNC_MARKS 10
6679 #define SYNC_MARK_STEP (3*HZ)
6680 void md_do_sync(mddev_t *mddev)
6683 unsigned int currspeed = 0,
6685 sector_t max_sectors,j, io_sectors;
6686 unsigned long mark[SYNC_MARKS];
6687 sector_t mark_cnt[SYNC_MARKS];
6689 struct list_head *tmp;
6690 sector_t last_check;
6695 /* just incase thread restarts... */
6696 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
6698 if (mddev->ro) /* never try to sync a read-only array */
6701 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
6702 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
6703 desc = "data-check";
6704 else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
6705 desc = "requested-resync";
6708 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
6713 /* we overload curr_resync somewhat here.
6714 * 0 == not engaged in resync at all
6715 * 2 == checking that there is no conflict with another sync
6716 * 1 == like 2, but have yielded to allow conflicting resync to
6718 * other == active in resync - this many blocks
6720 * Before starting a resync we must have set curr_resync to
6721 * 2, and then checked that every "conflicting" array has curr_resync
6722 * less than ours. When we find one that is the same or higher
6723 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
6724 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
6725 * This will mean we have to start checking from the beginning again.
6730 mddev->curr_resync = 2;
6733 if (kthread_should_stop())
6734 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6736 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
6738 for_each_mddev(mddev2, tmp) {
6739 if (mddev2 == mddev)
6741 if (!mddev->parallel_resync
6742 && mddev2->curr_resync
6743 && match_mddev_units(mddev, mddev2)) {
6745 if (mddev < mddev2 && mddev->curr_resync == 2) {
6746 /* arbitrarily yield */
6747 mddev->curr_resync = 1;
6748 wake_up(&resync_wait);
6750 if (mddev > mddev2 && mddev->curr_resync == 1)
6751 /* no need to wait here, we can wait the next
6752 * time 'round when curr_resync == 2
6755 /* We need to wait 'interruptible' so as not to
6756 * contribute to the load average, and not to
6757 * be caught by 'softlockup'
6759 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
6760 if (!kthread_should_stop() &&
6761 mddev2->curr_resync >= mddev->curr_resync) {
6762 printk(KERN_INFO "md: delaying %s of %s"
6763 " until %s has finished (they"
6764 " share one or more physical units)\n",
6765 desc, mdname(mddev), mdname(mddev2));
6767 if (signal_pending(current))
6768 flush_signals(current);
6770 finish_wait(&resync_wait, &wq);
6773 finish_wait(&resync_wait, &wq);
6776 } while (mddev->curr_resync < 2);
6779 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
6780 /* resync follows the size requested by the personality,
6781 * which defaults to physical size, but can be virtual size
6783 max_sectors = mddev->resync_max_sectors;
6784 mddev->resync_mismatches = 0;
6785 /* we don't use the checkpoint if there's a bitmap */
6786 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
6787 j = mddev->resync_min;
6788 else if (!mddev->bitmap)
6789 j = mddev->recovery_cp;
6791 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
6792 max_sectors = mddev->dev_sectors;
6794 /* recovery follows the physical size of devices */
6795 max_sectors = mddev->dev_sectors;
6798 list_for_each_entry_rcu(rdev, &mddev->disks, same_set)
6799 if (rdev->raid_disk >= 0 &&
6800 !test_bit(Faulty, &rdev->flags) &&
6801 !test_bit(In_sync, &rdev->flags) &&
6802 rdev->recovery_offset < j)
6803 j = rdev->recovery_offset;
6807 printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev));
6808 printk(KERN_INFO "md: minimum _guaranteed_ speed:"
6809 " %d KB/sec/disk.\n", speed_min(mddev));
6810 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
6811 "(but not more than %d KB/sec) for %s.\n",
6812 speed_max(mddev), desc);
6814 is_mddev_idle(mddev, 1); /* this initializes IO event counters */
6817 for (m = 0; m < SYNC_MARKS; m++) {
6819 mark_cnt[m] = io_sectors;
6822 mddev->resync_mark = mark[last_mark];
6823 mddev->resync_mark_cnt = mark_cnt[last_mark];
6826 * Tune reconstruction:
6828 window = 32*(PAGE_SIZE/512);
6829 printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n",
6830 window/2,(unsigned long long) max_sectors/2);
6832 atomic_set(&mddev->recovery_active, 0);
6837 "md: resuming %s of %s from checkpoint.\n",
6838 desc, mdname(mddev));
6839 mddev->curr_resync = j;
6841 mddev->curr_resync_completed = j;
6843 while (j < max_sectors) {
6848 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
6849 ((mddev->curr_resync > mddev->curr_resync_completed &&
6850 (mddev->curr_resync - mddev->curr_resync_completed)
6851 > (max_sectors >> 4)) ||
6852 (j - mddev->curr_resync_completed)*2
6853 >= mddev->resync_max - mddev->curr_resync_completed
6855 /* time to update curr_resync_completed */
6857 wait_event(mddev->recovery_wait,
6858 atomic_read(&mddev->recovery_active) == 0);
6859 mddev->curr_resync_completed = j;
6860 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6861 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
6864 while (j >= mddev->resync_max && !kthread_should_stop()) {
6865 /* As this condition is controlled by user-space,
6866 * we can block indefinitely, so use '_interruptible'
6867 * to avoid triggering warnings.
6869 flush_signals(current); /* just in case */
6870 wait_event_interruptible(mddev->recovery_wait,
6871 mddev->resync_max > j
6872 || kthread_should_stop());
6875 if (kthread_should_stop())
6878 sectors = mddev->pers->sync_request(mddev, j, &skipped,
6879 currspeed < speed_min(mddev));
6881 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6885 if (!skipped) { /* actual IO requested */
6886 io_sectors += sectors;
6887 atomic_add(sectors, &mddev->recovery_active);
6891 if (j>1) mddev->curr_resync = j;
6892 mddev->curr_mark_cnt = io_sectors;
6893 if (last_check == 0)
6894 /* this is the earliers that rebuilt will be
6895 * visible in /proc/mdstat
6897 md_new_event(mddev);
6899 if (last_check + window > io_sectors || j == max_sectors)
6902 last_check = io_sectors;
6904 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
6908 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
6910 int next = (last_mark+1) % SYNC_MARKS;
6912 mddev->resync_mark = mark[next];
6913 mddev->resync_mark_cnt = mark_cnt[next];
6914 mark[next] = jiffies;
6915 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
6920 if (kthread_should_stop())
6925 * this loop exits only if either when we are slower than
6926 * the 'hard' speed limit, or the system was IO-idle for
6928 * the system might be non-idle CPU-wise, but we only care
6929 * about not overloading the IO subsystem. (things like an
6930 * e2fsck being done on the RAID array should execute fast)
6935 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
6936 /((jiffies-mddev->resync_mark)/HZ +1) +1;
6938 if (currspeed > speed_min(mddev)) {
6939 if ((currspeed > speed_max(mddev)) ||
6940 !is_mddev_idle(mddev, 0)) {
6946 printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc);
6948 * this also signals 'finished resyncing' to md_stop
6953 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
6955 /* tell personality that we are finished */
6956 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
6958 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
6959 mddev->curr_resync > 2) {
6960 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
6961 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
6962 if (mddev->curr_resync >= mddev->recovery_cp) {
6964 "md: checkpointing %s of %s.\n",
6965 desc, mdname(mddev));
6966 mddev->recovery_cp = mddev->curr_resync;
6969 mddev->recovery_cp = MaxSector;
6971 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
6972 mddev->curr_resync = MaxSector;
6974 list_for_each_entry_rcu(rdev, &mddev->disks, same_set)
6975 if (rdev->raid_disk >= 0 &&
6976 mddev->delta_disks >= 0 &&
6977 !test_bit(Faulty, &rdev->flags) &&
6978 !test_bit(In_sync, &rdev->flags) &&
6979 rdev->recovery_offset < mddev->curr_resync)
6980 rdev->recovery_offset = mddev->curr_resync;
6984 set_bit(MD_CHANGE_DEVS, &mddev->flags);
6987 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
6988 /* We completed so min/max setting can be forgotten if used. */
6989 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
6990 mddev->resync_min = 0;
6991 mddev->resync_max = MaxSector;
6992 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
6993 mddev->resync_min = mddev->curr_resync_completed;
6994 mddev->curr_resync = 0;
6995 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
6996 mddev->curr_resync_completed = 0;
6997 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
6998 wake_up(&resync_wait);
6999 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
7000 md_wakeup_thread(mddev->thread);
7005 * got a signal, exit.
7008 "md: md_do_sync() got signal ... exiting\n");
7009 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7013 EXPORT_SYMBOL_GPL(md_do_sync);
7016 static int remove_and_add_spares(mddev_t *mddev)
7021 mddev->curr_resync_completed = 0;
7023 list_for_each_entry(rdev, &mddev->disks, same_set)
7024 if (rdev->raid_disk >= 0 &&
7025 !test_bit(Blocked, &rdev->flags) &&
7026 (test_bit(Faulty, &rdev->flags) ||
7027 ! test_bit(In_sync, &rdev->flags)) &&
7028 atomic_read(&rdev->nr_pending)==0) {
7029 if (mddev->pers->hot_remove_disk(
7030 mddev, rdev->raid_disk)==0) {
7032 sprintf(nm,"rd%d", rdev->raid_disk);
7033 sysfs_remove_link(&mddev->kobj, nm);
7034 rdev->raid_disk = -1;
7038 if (mddev->degraded && ! mddev->ro && !mddev->recovery_disabled) {
7039 list_for_each_entry(rdev, &mddev->disks, same_set) {
7040 if (rdev->raid_disk >= 0 &&
7041 !test_bit(In_sync, &rdev->flags) &&
7042 !test_bit(Blocked, &rdev->flags))
7044 if (rdev->raid_disk < 0
7045 && !test_bit(Faulty, &rdev->flags)) {
7046 rdev->recovery_offset = 0;
7048 hot_add_disk(mddev, rdev) == 0) {
7050 sprintf(nm, "rd%d", rdev->raid_disk);
7051 if (sysfs_create_link(&mddev->kobj,
7053 /* failure here is OK */;
7055 md_new_event(mddev);
7056 set_bit(MD_CHANGE_DEVS, &mddev->flags);
7065 static void reap_sync_thread(mddev_t *mddev)
7069 /* resync has finished, collect result */
7070 md_unregister_thread(mddev->sync_thread);
7071 mddev->sync_thread = NULL;
7072 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
7073 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
7075 /* activate any spares */
7076 if (mddev->pers->spare_active(mddev))
7077 sysfs_notify(&mddev->kobj, NULL,
7080 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
7081 mddev->pers->finish_reshape)
7082 mddev->pers->finish_reshape(mddev);
7083 md_update_sb(mddev, 1);
7085 /* if array is no-longer degraded, then any saved_raid_disk
7086 * information must be scrapped
7088 if (!mddev->degraded)
7089 list_for_each_entry(rdev, &mddev->disks, same_set)
7090 rdev->saved_raid_disk = -1;
7092 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7093 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7094 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
7095 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
7096 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
7097 /* flag recovery needed just to double check */
7098 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7099 sysfs_notify_dirent_safe(mddev->sysfs_action);
7100 md_new_event(mddev);
7104 * This routine is regularly called by all per-raid-array threads to
7105 * deal with generic issues like resync and super-block update.
7106 * Raid personalities that don't have a thread (linear/raid0) do not
7107 * need this as they never do any recovery or update the superblock.
7109 * It does not do any resync itself, but rather "forks" off other threads
7110 * to do that as needed.
7111 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
7112 * "->recovery" and create a thread at ->sync_thread.
7113 * When the thread finishes it sets MD_RECOVERY_DONE
7114 * and wakeups up this thread which will reap the thread and finish up.
7115 * This thread also removes any faulty devices (with nr_pending == 0).
7117 * The overall approach is:
7118 * 1/ if the superblock needs updating, update it.
7119 * 2/ If a recovery thread is running, don't do anything else.
7120 * 3/ If recovery has finished, clean up, possibly marking spares active.
7121 * 4/ If there are any faulty devices, remove them.
7122 * 5/ If array is degraded, try to add spares devices
7123 * 6/ If array has spares or is not in-sync, start a resync thread.
7125 void md_check_recovery(mddev_t *mddev)
7128 bitmap_daemon_work(mddev);
7133 if (signal_pending(current)) {
7134 if (mddev->pers->sync_request && !mddev->external) {
7135 printk(KERN_INFO "md: %s in immediate safe mode\n",
7137 mddev->safemode = 2;
7139 flush_signals(current);
7142 if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
7145 (mddev->flags & ~ (1<<MD_CHANGE_PENDING)) ||
7146 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
7147 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
7148 (mddev->external == 0 && mddev->safemode == 1) ||
7149 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
7150 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
7154 if (mddev_trylock(mddev)) {
7158 /* Only thing we do on a ro array is remove
7161 remove_and_add_spares(mddev);
7162 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7166 if (!mddev->external) {
7168 spin_lock_irq(&mddev->write_lock);
7169 if (mddev->safemode &&
7170 !atomic_read(&mddev->writes_pending) &&
7172 mddev->recovery_cp == MaxSector) {
7175 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
7177 if (mddev->safemode == 1)
7178 mddev->safemode = 0;
7179 spin_unlock_irq(&mddev->write_lock);
7181 sysfs_notify_dirent_safe(mddev->sysfs_state);
7185 md_update_sb(mddev, 0);
7187 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
7188 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
7189 /* resync/recovery still happening */
7190 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7193 if (mddev->sync_thread) {
7194 reap_sync_thread(mddev);
7197 /* Set RUNNING before clearing NEEDED to avoid
7198 * any transients in the value of "sync_action".
7200 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7201 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7202 /* Clear some bits that don't mean anything, but
7205 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
7206 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
7208 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
7210 /* no recovery is running.
7211 * remove any failed drives, then
7212 * add spares if possible.
7213 * Spare are also removed and re-added, to allow
7214 * the personality to fail the re-add.
7217 if (mddev->reshape_position != MaxSector) {
7218 if (mddev->pers->check_reshape == NULL ||
7219 mddev->pers->check_reshape(mddev) != 0)
7220 /* Cannot proceed */
7222 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
7223 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7224 } else if ((spares = remove_and_add_spares(mddev))) {
7225 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7226 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
7227 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
7228 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7229 } else if (mddev->recovery_cp < MaxSector) {
7230 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7231 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7232 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
7233 /* nothing to be done ... */
7236 if (mddev->pers->sync_request) {
7237 if (spares && mddev->bitmap && ! mddev->bitmap->file) {
7238 /* We are adding a device or devices to an array
7239 * which has the bitmap stored on all devices.
7240 * So make sure all bitmap pages get written
7242 bitmap_write_all(mddev->bitmap);
7244 mddev->sync_thread = md_register_thread(md_do_sync,
7247 if (!mddev->sync_thread) {
7248 printk(KERN_ERR "%s: could not start resync"
7251 /* leave the spares where they are, it shouldn't hurt */
7252 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7253 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7254 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
7255 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
7256 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
7258 md_wakeup_thread(mddev->sync_thread);
7259 sysfs_notify_dirent_safe(mddev->sysfs_action);
7260 md_new_event(mddev);
7263 if (!mddev->sync_thread) {
7264 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7265 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
7267 if (mddev->sysfs_action)
7268 sysfs_notify_dirent_safe(mddev->sysfs_action);
7270 mddev_unlock(mddev);
7274 void md_wait_for_blocked_rdev(mdk_rdev_t *rdev, mddev_t *mddev)
7276 sysfs_notify_dirent_safe(rdev->sysfs_state);
7277 wait_event_timeout(rdev->blocked_wait,
7278 !test_bit(Blocked, &rdev->flags),
7279 msecs_to_jiffies(5000));
7280 rdev_dec_pending(rdev, mddev);
7282 EXPORT_SYMBOL(md_wait_for_blocked_rdev);
7284 static int md_notify_reboot(struct notifier_block *this,
7285 unsigned long code, void *x)
7287 struct list_head *tmp;
7290 if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) {
7292 printk(KERN_INFO "md: stopping all md devices.\n");
7294 for_each_mddev(mddev, tmp)
7295 if (mddev_trylock(mddev)) {
7296 /* Force a switch to readonly even array
7297 * appears to still be in use. Hence
7300 md_set_readonly(mddev, 100);
7301 mddev_unlock(mddev);
7304 * certain more exotic SCSI devices are known to be
7305 * volatile wrt too early system reboots. While the
7306 * right place to handle this issue is the given
7307 * driver, we do want to have a safe RAID driver ...
7314 static struct notifier_block md_notifier = {
7315 .notifier_call = md_notify_reboot,
7317 .priority = INT_MAX, /* before any real devices */
7320 static void md_geninit(void)
7322 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
7324 proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops);
7327 static int __init md_init(void)
7331 md_wq = alloc_workqueue("md", WQ_RESCUER, 0);
7335 md_misc_wq = alloc_workqueue("md_misc", 0, 0);
7339 if ((ret = register_blkdev(MD_MAJOR, "md")) < 0)
7342 if ((ret = register_blkdev(0, "mdp")) < 0)
7346 blk_register_region(MKDEV(MD_MAJOR, 0), 1UL<<MINORBITS, THIS_MODULE,
7347 md_probe, NULL, NULL);
7348 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
7349 md_probe, NULL, NULL);
7351 register_reboot_notifier(&md_notifier);
7352 raid_table_header = register_sysctl_table(raid_root_table);
7358 unregister_blkdev(MD_MAJOR, "md");
7360 destroy_workqueue(md_misc_wq);
7362 destroy_workqueue(md_wq);
7370 * Searches all registered partitions for autorun RAID arrays
7374 static LIST_HEAD(all_detected_devices);
7375 struct detected_devices_node {
7376 struct list_head list;
7380 void md_autodetect_dev(dev_t dev)
7382 struct detected_devices_node *node_detected_dev;
7384 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
7385 if (node_detected_dev) {
7386 node_detected_dev->dev = dev;
7387 list_add_tail(&node_detected_dev->list, &all_detected_devices);
7389 printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed"
7390 ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev));
7395 static void autostart_arrays(int part)
7398 struct detected_devices_node *node_detected_dev;
7400 int i_scanned, i_passed;
7405 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
7407 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
7409 node_detected_dev = list_entry(all_detected_devices.next,
7410 struct detected_devices_node, list);
7411 list_del(&node_detected_dev->list);
7412 dev = node_detected_dev->dev;
7413 kfree(node_detected_dev);
7414 rdev = md_import_device(dev,0, 90);
7418 if (test_bit(Faulty, &rdev->flags)) {
7422 set_bit(AutoDetected, &rdev->flags);
7423 list_add(&rdev->same_set, &pending_raid_disks);
7427 printk(KERN_INFO "md: Scanned %d and added %d devices.\n",
7428 i_scanned, i_passed);
7430 autorun_devices(part);
7433 #endif /* !MODULE */
7435 static __exit void md_exit(void)
7438 struct list_head *tmp;
7440 blk_unregister_region(MKDEV(MD_MAJOR,0), 1U << MINORBITS);
7441 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
7443 unregister_blkdev(MD_MAJOR,"md");
7444 unregister_blkdev(mdp_major, "mdp");
7445 unregister_reboot_notifier(&md_notifier);
7446 unregister_sysctl_table(raid_table_header);
7447 remove_proc_entry("mdstat", NULL);
7448 for_each_mddev(mddev, tmp) {
7449 export_array(mddev);
7450 mddev->hold_active = 0;
7452 destroy_workqueue(md_misc_wq);
7453 destroy_workqueue(md_wq);
7456 subsys_initcall(md_init);
7457 module_exit(md_exit)
7459 static int get_ro(char *buffer, struct kernel_param *kp)
7461 return sprintf(buffer, "%d", start_readonly);
7463 static int set_ro(const char *val, struct kernel_param *kp)
7466 int num = simple_strtoul(val, &e, 10);
7467 if (*val && (*e == '\0' || *e == '\n')) {
7468 start_readonly = num;
7474 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
7475 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
7477 module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR);
7479 EXPORT_SYMBOL(register_md_personality);
7480 EXPORT_SYMBOL(unregister_md_personality);
7481 EXPORT_SYMBOL(md_error);
7482 EXPORT_SYMBOL(md_done_sync);
7483 EXPORT_SYMBOL(md_write_start);
7484 EXPORT_SYMBOL(md_write_end);
7485 EXPORT_SYMBOL(md_register_thread);
7486 EXPORT_SYMBOL(md_unregister_thread);
7487 EXPORT_SYMBOL(md_wakeup_thread);
7488 EXPORT_SYMBOL(md_check_recovery);
7489 MODULE_LICENSE("GPL");
7490 MODULE_DESCRIPTION("MD RAID framework");
7492 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);