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;
290 unsigned int sectors;
292 if (mddev == NULL || mddev->pers == NULL
297 smp_rmb(); /* Ensure implications of 'active' are visible */
299 if (mddev->suspended) {
302 prepare_to_wait(&mddev->sb_wait, &__wait,
303 TASK_UNINTERRUPTIBLE);
304 if (!mddev->suspended)
310 finish_wait(&mddev->sb_wait, &__wait);
312 atomic_inc(&mddev->active_io);
316 * save the sectors now since our bio can
317 * go away inside make_request
319 sectors = bio_sectors(bio);
320 rv = mddev->pers->make_request(mddev, bio);
322 cpu = part_stat_lock();
323 part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]);
324 part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw], sectors);
327 if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended)
328 wake_up(&mddev->sb_wait);
333 /* mddev_suspend makes sure no new requests are submitted
334 * to the device, and that any requests that have been submitted
335 * are completely handled.
336 * Once ->stop is called and completes, the module will be completely
339 void mddev_suspend(mddev_t *mddev)
341 BUG_ON(mddev->suspended);
342 mddev->suspended = 1;
344 wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0);
345 mddev->pers->quiesce(mddev, 1);
347 EXPORT_SYMBOL_GPL(mddev_suspend);
349 void mddev_resume(mddev_t *mddev)
351 mddev->suspended = 0;
352 wake_up(&mddev->sb_wait);
353 mddev->pers->quiesce(mddev, 0);
355 md_wakeup_thread(mddev->thread);
356 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
358 EXPORT_SYMBOL_GPL(mddev_resume);
360 int mddev_congested(mddev_t *mddev, int bits)
362 return mddev->suspended;
364 EXPORT_SYMBOL(mddev_congested);
367 * Generic flush handling for md
370 static void md_end_flush(struct bio *bio, int err)
372 mdk_rdev_t *rdev = bio->bi_private;
373 mddev_t *mddev = rdev->mddev;
375 rdev_dec_pending(rdev, mddev);
377 if (atomic_dec_and_test(&mddev->flush_pending)) {
378 /* The pre-request flush has finished */
379 queue_work(md_wq, &mddev->flush_work);
384 static void md_submit_flush_data(struct work_struct *ws);
386 static void submit_flushes(struct work_struct *ws)
388 mddev_t *mddev = container_of(ws, mddev_t, flush_work);
391 INIT_WORK(&mddev->flush_work, md_submit_flush_data);
392 atomic_set(&mddev->flush_pending, 1);
394 list_for_each_entry_rcu(rdev, &mddev->disks, same_set)
395 if (rdev->raid_disk >= 0 &&
396 !test_bit(Faulty, &rdev->flags)) {
397 /* Take two references, one is dropped
398 * when request finishes, one after
399 * we reclaim rcu_read_lock
402 atomic_inc(&rdev->nr_pending);
403 atomic_inc(&rdev->nr_pending);
405 bi = bio_alloc_mddev(GFP_KERNEL, 0, mddev);
406 bi->bi_end_io = md_end_flush;
407 bi->bi_private = rdev;
408 bi->bi_bdev = rdev->bdev;
409 atomic_inc(&mddev->flush_pending);
410 submit_bio(WRITE_FLUSH, bi);
412 rdev_dec_pending(rdev, mddev);
415 if (atomic_dec_and_test(&mddev->flush_pending))
416 queue_work(md_wq, &mddev->flush_work);
419 static void md_submit_flush_data(struct work_struct *ws)
421 mddev_t *mddev = container_of(ws, mddev_t, flush_work);
422 struct bio *bio = mddev->flush_bio;
424 if (bio->bi_size == 0)
425 /* an empty barrier - all done */
428 bio->bi_rw &= ~REQ_FLUSH;
429 if (mddev->pers->make_request(mddev, bio))
430 generic_make_request(bio);
433 mddev->flush_bio = NULL;
434 wake_up(&mddev->sb_wait);
437 void md_flush_request(mddev_t *mddev, struct bio *bio)
439 spin_lock_irq(&mddev->write_lock);
440 wait_event_lock_irq(mddev->sb_wait,
442 mddev->write_lock, /*nothing*/);
443 mddev->flush_bio = bio;
444 spin_unlock_irq(&mddev->write_lock);
446 INIT_WORK(&mddev->flush_work, submit_flushes);
447 queue_work(md_wq, &mddev->flush_work);
449 EXPORT_SYMBOL(md_flush_request);
451 /* Support for plugging.
452 * This mirrors the plugging support in request_queue, but does not
453 * require having a whole queue or request structures.
454 * We allocate an md_plug_cb for each md device and each thread it gets
455 * plugged on. This links tot the private plug_handle structure in the
456 * personality data where we keep a count of the number of outstanding
457 * plugs so other code can see if a plug is active.
460 struct blk_plug_cb cb;
464 static void plugger_unplug(struct blk_plug_cb *cb)
466 struct md_plug_cb *mdcb = container_of(cb, struct md_plug_cb, cb);
467 if (atomic_dec_and_test(&mdcb->mddev->plug_cnt))
468 md_wakeup_thread(mdcb->mddev->thread);
472 /* Check that an unplug wakeup will come shortly.
473 * If not, wakeup the md thread immediately
475 int mddev_check_plugged(mddev_t *mddev)
477 struct blk_plug *plug = current->plug;
478 struct md_plug_cb *mdcb;
483 list_for_each_entry(mdcb, &plug->cb_list, cb.list) {
484 if (mdcb->cb.callback == plugger_unplug &&
485 mdcb->mddev == mddev) {
486 /* Already on the list, move to top */
487 if (mdcb != list_first_entry(&plug->cb_list,
490 list_move(&mdcb->cb.list, &plug->cb_list);
494 /* Not currently on the callback list */
495 mdcb = kmalloc(sizeof(*mdcb), GFP_ATOMIC);
500 mdcb->cb.callback = plugger_unplug;
501 atomic_inc(&mddev->plug_cnt);
502 list_add(&mdcb->cb.list, &plug->cb_list);
505 EXPORT_SYMBOL_GPL(mddev_check_plugged);
507 static inline mddev_t *mddev_get(mddev_t *mddev)
509 atomic_inc(&mddev->active);
513 static void mddev_delayed_delete(struct work_struct *ws);
515 static void mddev_put(mddev_t *mddev)
517 struct bio_set *bs = NULL;
519 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
521 if (!mddev->raid_disks && list_empty(&mddev->disks) &&
522 mddev->ctime == 0 && !mddev->hold_active) {
523 /* Array is not configured at all, and not held active,
525 list_del(&mddev->all_mddevs);
527 mddev->bio_set = NULL;
528 if (mddev->gendisk) {
529 /* We did a probe so need to clean up. Call
530 * queue_work inside the spinlock so that
531 * flush_workqueue() after mddev_find will
532 * succeed in waiting for the work to be done.
534 INIT_WORK(&mddev->del_work, mddev_delayed_delete);
535 queue_work(md_misc_wq, &mddev->del_work);
539 spin_unlock(&all_mddevs_lock);
544 void mddev_init(mddev_t *mddev)
546 mutex_init(&mddev->open_mutex);
547 mutex_init(&mddev->reconfig_mutex);
548 mutex_init(&mddev->bitmap_info.mutex);
549 INIT_LIST_HEAD(&mddev->disks);
550 INIT_LIST_HEAD(&mddev->all_mddevs);
551 init_timer(&mddev->safemode_timer);
552 atomic_set(&mddev->active, 1);
553 atomic_set(&mddev->openers, 0);
554 atomic_set(&mddev->active_io, 0);
555 atomic_set(&mddev->plug_cnt, 0);
556 spin_lock_init(&mddev->write_lock);
557 atomic_set(&mddev->flush_pending, 0);
558 init_waitqueue_head(&mddev->sb_wait);
559 init_waitqueue_head(&mddev->recovery_wait);
560 mddev->reshape_position = MaxSector;
561 mddev->resync_min = 0;
562 mddev->resync_max = MaxSector;
563 mddev->level = LEVEL_NONE;
565 EXPORT_SYMBOL_GPL(mddev_init);
567 static mddev_t * mddev_find(dev_t unit)
569 mddev_t *mddev, *new = NULL;
571 if (unit && MAJOR(unit) != MD_MAJOR)
572 unit &= ~((1<<MdpMinorShift)-1);
575 spin_lock(&all_mddevs_lock);
578 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
579 if (mddev->unit == unit) {
581 spin_unlock(&all_mddevs_lock);
587 list_add(&new->all_mddevs, &all_mddevs);
588 spin_unlock(&all_mddevs_lock);
589 new->hold_active = UNTIL_IOCTL;
593 /* find an unused unit number */
594 static int next_minor = 512;
595 int start = next_minor;
599 dev = MKDEV(MD_MAJOR, next_minor);
601 if (next_minor > MINORMASK)
603 if (next_minor == start) {
604 /* Oh dear, all in use. */
605 spin_unlock(&all_mddevs_lock);
611 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
612 if (mddev->unit == dev) {
618 new->md_minor = MINOR(dev);
619 new->hold_active = UNTIL_STOP;
620 list_add(&new->all_mddevs, &all_mddevs);
621 spin_unlock(&all_mddevs_lock);
624 spin_unlock(&all_mddevs_lock);
626 new = kzalloc(sizeof(*new), GFP_KERNEL);
631 if (MAJOR(unit) == MD_MAJOR)
632 new->md_minor = MINOR(unit);
634 new->md_minor = MINOR(unit) >> MdpMinorShift;
641 static inline int mddev_lock(mddev_t * mddev)
643 return mutex_lock_interruptible(&mddev->reconfig_mutex);
646 static inline int mddev_is_locked(mddev_t *mddev)
648 return mutex_is_locked(&mddev->reconfig_mutex);
651 static inline int mddev_trylock(mddev_t * mddev)
653 return mutex_trylock(&mddev->reconfig_mutex);
656 static struct attribute_group md_redundancy_group;
658 static void mddev_unlock(mddev_t * mddev)
660 if (mddev->to_remove) {
661 /* These cannot be removed under reconfig_mutex as
662 * an access to the files will try to take reconfig_mutex
663 * while holding the file unremovable, which leads to
665 * So hold set sysfs_active while the remove in happeing,
666 * and anything else which might set ->to_remove or my
667 * otherwise change the sysfs namespace will fail with
668 * -EBUSY if sysfs_active is still set.
669 * We set sysfs_active under reconfig_mutex and elsewhere
670 * test it under the same mutex to ensure its correct value
673 struct attribute_group *to_remove = mddev->to_remove;
674 mddev->to_remove = NULL;
675 mddev->sysfs_active = 1;
676 mutex_unlock(&mddev->reconfig_mutex);
678 if (mddev->kobj.sd) {
679 if (to_remove != &md_redundancy_group)
680 sysfs_remove_group(&mddev->kobj, to_remove);
681 if (mddev->pers == NULL ||
682 mddev->pers->sync_request == NULL) {
683 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
684 if (mddev->sysfs_action)
685 sysfs_put(mddev->sysfs_action);
686 mddev->sysfs_action = NULL;
689 mddev->sysfs_active = 0;
691 mutex_unlock(&mddev->reconfig_mutex);
693 md_wakeup_thread(mddev->thread);
696 static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr)
700 list_for_each_entry(rdev, &mddev->disks, same_set)
701 if (rdev->desc_nr == nr)
707 static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev)
711 list_for_each_entry(rdev, &mddev->disks, same_set)
712 if (rdev->bdev->bd_dev == dev)
718 static struct mdk_personality *find_pers(int level, char *clevel)
720 struct mdk_personality *pers;
721 list_for_each_entry(pers, &pers_list, list) {
722 if (level != LEVEL_NONE && pers->level == level)
724 if (strcmp(pers->name, clevel)==0)
730 /* return the offset of the super block in 512byte sectors */
731 static inline sector_t calc_dev_sboffset(mdk_rdev_t *rdev)
733 sector_t num_sectors = i_size_read(rdev->bdev->bd_inode) / 512;
734 return MD_NEW_SIZE_SECTORS(num_sectors);
737 static int alloc_disk_sb(mdk_rdev_t * rdev)
742 rdev->sb_page = alloc_page(GFP_KERNEL);
743 if (!rdev->sb_page) {
744 printk(KERN_ALERT "md: out of memory.\n");
751 static void free_disk_sb(mdk_rdev_t * rdev)
754 put_page(rdev->sb_page);
756 rdev->sb_page = NULL;
763 static void super_written(struct bio *bio, int error)
765 mdk_rdev_t *rdev = bio->bi_private;
766 mddev_t *mddev = rdev->mddev;
768 if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) {
769 printk("md: super_written gets error=%d, uptodate=%d\n",
770 error, test_bit(BIO_UPTODATE, &bio->bi_flags));
771 WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags));
772 md_error(mddev, rdev);
775 if (atomic_dec_and_test(&mddev->pending_writes))
776 wake_up(&mddev->sb_wait);
780 void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
781 sector_t sector, int size, struct page *page)
783 /* write first size bytes of page to sector of rdev
784 * Increment mddev->pending_writes before returning
785 * and decrement it on completion, waking up sb_wait
786 * if zero is reached.
787 * If an error occurred, call md_error
789 struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, mddev);
791 bio->bi_bdev = rdev->meta_bdev ? rdev->meta_bdev : rdev->bdev;
792 bio->bi_sector = sector;
793 bio_add_page(bio, page, size, 0);
794 bio->bi_private = rdev;
795 bio->bi_end_io = super_written;
797 atomic_inc(&mddev->pending_writes);
798 submit_bio(REQ_WRITE | REQ_SYNC | REQ_FLUSH | REQ_FUA, bio);
801 void md_super_wait(mddev_t *mddev)
803 /* wait for all superblock writes that were scheduled to complete */
806 prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE);
807 if (atomic_read(&mddev->pending_writes)==0)
811 finish_wait(&mddev->sb_wait, &wq);
814 static void bi_complete(struct bio *bio, int error)
816 complete((struct completion*)bio->bi_private);
819 int sync_page_io(mdk_rdev_t *rdev, sector_t sector, int size,
820 struct page *page, int rw, bool metadata_op)
822 struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, rdev->mddev);
823 struct completion event;
828 bio->bi_bdev = (metadata_op && rdev->meta_bdev) ?
829 rdev->meta_bdev : rdev->bdev;
831 bio->bi_sector = sector + rdev->sb_start;
833 bio->bi_sector = sector + rdev->data_offset;
834 bio_add_page(bio, page, size, 0);
835 init_completion(&event);
836 bio->bi_private = &event;
837 bio->bi_end_io = bi_complete;
839 wait_for_completion(&event);
841 ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
845 EXPORT_SYMBOL_GPL(sync_page_io);
847 static int read_disk_sb(mdk_rdev_t * rdev, int size)
849 char b[BDEVNAME_SIZE];
850 if (!rdev->sb_page) {
858 if (!sync_page_io(rdev, 0, size, rdev->sb_page, READ, true))
864 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
865 bdevname(rdev->bdev,b));
869 static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
871 return sb1->set_uuid0 == sb2->set_uuid0 &&
872 sb1->set_uuid1 == sb2->set_uuid1 &&
873 sb1->set_uuid2 == sb2->set_uuid2 &&
874 sb1->set_uuid3 == sb2->set_uuid3;
877 static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
880 mdp_super_t *tmp1, *tmp2;
882 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
883 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
885 if (!tmp1 || !tmp2) {
887 printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n");
895 * nr_disks is not constant
900 ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0);
908 static u32 md_csum_fold(u32 csum)
910 csum = (csum & 0xffff) + (csum >> 16);
911 return (csum & 0xffff) + (csum >> 16);
914 static unsigned int calc_sb_csum(mdp_super_t * sb)
917 u32 *sb32 = (u32*)sb;
919 unsigned int disk_csum, csum;
921 disk_csum = sb->sb_csum;
924 for (i = 0; i < MD_SB_BYTES/4 ; i++)
926 csum = (newcsum & 0xffffffff) + (newcsum>>32);
930 /* This used to use csum_partial, which was wrong for several
931 * reasons including that different results are returned on
932 * different architectures. It isn't critical that we get exactly
933 * the same return value as before (we always csum_fold before
934 * testing, and that removes any differences). However as we
935 * know that csum_partial always returned a 16bit value on
936 * alphas, do a fold to maximise conformity to previous behaviour.
938 sb->sb_csum = md_csum_fold(disk_csum);
940 sb->sb_csum = disk_csum;
947 * Handle superblock details.
948 * We want to be able to handle multiple superblock formats
949 * so we have a common interface to them all, and an array of
950 * different handlers.
951 * We rely on user-space to write the initial superblock, and support
952 * reading and updating of superblocks.
953 * Interface methods are:
954 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
955 * loads and validates a superblock on dev.
956 * if refdev != NULL, compare superblocks on both devices
958 * 0 - dev has a superblock that is compatible with refdev
959 * 1 - dev has a superblock that is compatible and newer than refdev
960 * so dev should be used as the refdev in future
961 * -EINVAL superblock incompatible or invalid
962 * -othererror e.g. -EIO
964 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
965 * Verify that dev is acceptable into mddev.
966 * The first time, mddev->raid_disks will be 0, and data from
967 * dev should be merged in. Subsequent calls check that dev
968 * is new enough. Return 0 or -EINVAL
970 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
971 * Update the superblock for rdev with data in mddev
972 * This does not write to disc.
978 struct module *owner;
979 int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev,
981 int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev);
982 void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev);
983 unsigned long long (*rdev_size_change)(mdk_rdev_t *rdev,
984 sector_t num_sectors);
988 * Check that the given mddev has no bitmap.
990 * This function is called from the run method of all personalities that do not
991 * support bitmaps. It prints an error message and returns non-zero if mddev
992 * has a bitmap. Otherwise, it returns 0.
995 int md_check_no_bitmap(mddev_t *mddev)
997 if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset)
999 printk(KERN_ERR "%s: bitmaps are not supported for %s\n",
1000 mdname(mddev), mddev->pers->name);
1003 EXPORT_SYMBOL(md_check_no_bitmap);
1006 * load_super for 0.90.0
1008 static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
1010 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1015 * Calculate the position of the superblock (512byte sectors),
1016 * it's at the end of the disk.
1018 * It also happens to be a multiple of 4Kb.
1020 rdev->sb_start = calc_dev_sboffset(rdev);
1022 ret = read_disk_sb(rdev, MD_SB_BYTES);
1023 if (ret) return ret;
1027 bdevname(rdev->bdev, b);
1028 sb = page_address(rdev->sb_page);
1030 if (sb->md_magic != MD_SB_MAGIC) {
1031 printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
1036 if (sb->major_version != 0 ||
1037 sb->minor_version < 90 ||
1038 sb->minor_version > 91) {
1039 printk(KERN_WARNING "Bad version number %d.%d on %s\n",
1040 sb->major_version, sb->minor_version,
1045 if (sb->raid_disks <= 0)
1048 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
1049 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
1054 rdev->preferred_minor = sb->md_minor;
1055 rdev->data_offset = 0;
1056 rdev->sb_size = MD_SB_BYTES;
1058 if (sb->level == LEVEL_MULTIPATH)
1061 rdev->desc_nr = sb->this_disk.number;
1067 mdp_super_t *refsb = page_address(refdev->sb_page);
1068 if (!uuid_equal(refsb, sb)) {
1069 printk(KERN_WARNING "md: %s has different UUID to %s\n",
1070 b, bdevname(refdev->bdev,b2));
1073 if (!sb_equal(refsb, sb)) {
1074 printk(KERN_WARNING "md: %s has same UUID"
1075 " but different superblock to %s\n",
1076 b, bdevname(refdev->bdev, b2));
1080 ev2 = md_event(refsb);
1086 rdev->sectors = rdev->sb_start;
1088 if (rdev->sectors < sb->size * 2 && sb->level > 1)
1089 /* "this cannot possibly happen" ... */
1097 * validate_super for 0.90.0
1099 static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
1102 mdp_super_t *sb = page_address(rdev->sb_page);
1103 __u64 ev1 = md_event(sb);
1105 rdev->raid_disk = -1;
1106 clear_bit(Faulty, &rdev->flags);
1107 clear_bit(In_sync, &rdev->flags);
1108 clear_bit(WriteMostly, &rdev->flags);
1110 if (mddev->raid_disks == 0) {
1111 mddev->major_version = 0;
1112 mddev->minor_version = sb->minor_version;
1113 mddev->patch_version = sb->patch_version;
1114 mddev->external = 0;
1115 mddev->chunk_sectors = sb->chunk_size >> 9;
1116 mddev->ctime = sb->ctime;
1117 mddev->utime = sb->utime;
1118 mddev->level = sb->level;
1119 mddev->clevel[0] = 0;
1120 mddev->layout = sb->layout;
1121 mddev->raid_disks = sb->raid_disks;
1122 mddev->dev_sectors = sb->size * 2;
1123 mddev->events = ev1;
1124 mddev->bitmap_info.offset = 0;
1125 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
1127 if (mddev->minor_version >= 91) {
1128 mddev->reshape_position = sb->reshape_position;
1129 mddev->delta_disks = sb->delta_disks;
1130 mddev->new_level = sb->new_level;
1131 mddev->new_layout = sb->new_layout;
1132 mddev->new_chunk_sectors = sb->new_chunk >> 9;
1134 mddev->reshape_position = MaxSector;
1135 mddev->delta_disks = 0;
1136 mddev->new_level = mddev->level;
1137 mddev->new_layout = mddev->layout;
1138 mddev->new_chunk_sectors = mddev->chunk_sectors;
1141 if (sb->state & (1<<MD_SB_CLEAN))
1142 mddev->recovery_cp = MaxSector;
1144 if (sb->events_hi == sb->cp_events_hi &&
1145 sb->events_lo == sb->cp_events_lo) {
1146 mddev->recovery_cp = sb->recovery_cp;
1148 mddev->recovery_cp = 0;
1151 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
1152 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
1153 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
1154 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
1156 mddev->max_disks = MD_SB_DISKS;
1158 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
1159 mddev->bitmap_info.file == NULL)
1160 mddev->bitmap_info.offset =
1161 mddev->bitmap_info.default_offset;
1163 } else if (mddev->pers == NULL) {
1164 /* Insist on good event counter while assembling, except
1165 * for spares (which don't need an event count) */
1167 if (sb->disks[rdev->desc_nr].state & (
1168 (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE)))
1169 if (ev1 < mddev->events)
1171 } else if (mddev->bitmap) {
1172 /* if adding to array with a bitmap, then we can accept an
1173 * older device ... but not too old.
1175 if (ev1 < mddev->bitmap->events_cleared)
1178 if (ev1 < mddev->events)
1179 /* just a hot-add of a new device, leave raid_disk at -1 */
1183 if (mddev->level != LEVEL_MULTIPATH) {
1184 desc = sb->disks + rdev->desc_nr;
1186 if (desc->state & (1<<MD_DISK_FAULTY))
1187 set_bit(Faulty, &rdev->flags);
1188 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
1189 desc->raid_disk < mddev->raid_disks */) {
1190 set_bit(In_sync, &rdev->flags);
1191 rdev->raid_disk = desc->raid_disk;
1192 } else if (desc->state & (1<<MD_DISK_ACTIVE)) {
1193 /* active but not in sync implies recovery up to
1194 * reshape position. We don't know exactly where
1195 * that is, so set to zero for now */
1196 if (mddev->minor_version >= 91) {
1197 rdev->recovery_offset = 0;
1198 rdev->raid_disk = desc->raid_disk;
1201 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
1202 set_bit(WriteMostly, &rdev->flags);
1203 } else /* MULTIPATH are always insync */
1204 set_bit(In_sync, &rdev->flags);
1209 * sync_super for 0.90.0
1211 static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1215 int next_spare = mddev->raid_disks;
1218 /* make rdev->sb match mddev data..
1221 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1222 * 3/ any empty disks < next_spare become removed
1224 * disks[0] gets initialised to REMOVED because
1225 * we cannot be sure from other fields if it has
1226 * been initialised or not.
1229 int active=0, working=0,failed=0,spare=0,nr_disks=0;
1231 rdev->sb_size = MD_SB_BYTES;
1233 sb = page_address(rdev->sb_page);
1235 memset(sb, 0, sizeof(*sb));
1237 sb->md_magic = MD_SB_MAGIC;
1238 sb->major_version = mddev->major_version;
1239 sb->patch_version = mddev->patch_version;
1240 sb->gvalid_words = 0; /* ignored */
1241 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
1242 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
1243 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
1244 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
1246 sb->ctime = mddev->ctime;
1247 sb->level = mddev->level;
1248 sb->size = mddev->dev_sectors / 2;
1249 sb->raid_disks = mddev->raid_disks;
1250 sb->md_minor = mddev->md_minor;
1251 sb->not_persistent = 0;
1252 sb->utime = mddev->utime;
1254 sb->events_hi = (mddev->events>>32);
1255 sb->events_lo = (u32)mddev->events;
1257 if (mddev->reshape_position == MaxSector)
1258 sb->minor_version = 90;
1260 sb->minor_version = 91;
1261 sb->reshape_position = mddev->reshape_position;
1262 sb->new_level = mddev->new_level;
1263 sb->delta_disks = mddev->delta_disks;
1264 sb->new_layout = mddev->new_layout;
1265 sb->new_chunk = mddev->new_chunk_sectors << 9;
1267 mddev->minor_version = sb->minor_version;
1270 sb->recovery_cp = mddev->recovery_cp;
1271 sb->cp_events_hi = (mddev->events>>32);
1272 sb->cp_events_lo = (u32)mddev->events;
1273 if (mddev->recovery_cp == MaxSector)
1274 sb->state = (1<< MD_SB_CLEAN);
1276 sb->recovery_cp = 0;
1278 sb->layout = mddev->layout;
1279 sb->chunk_size = mddev->chunk_sectors << 9;
1281 if (mddev->bitmap && mddev->bitmap_info.file == NULL)
1282 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
1284 sb->disks[0].state = (1<<MD_DISK_REMOVED);
1285 list_for_each_entry(rdev2, &mddev->disks, same_set) {
1288 int is_active = test_bit(In_sync, &rdev2->flags);
1290 if (rdev2->raid_disk >= 0 &&
1291 sb->minor_version >= 91)
1292 /* we have nowhere to store the recovery_offset,
1293 * but if it is not below the reshape_position,
1294 * we can piggy-back on that.
1297 if (rdev2->raid_disk < 0 ||
1298 test_bit(Faulty, &rdev2->flags))
1301 desc_nr = rdev2->raid_disk;
1303 desc_nr = next_spare++;
1304 rdev2->desc_nr = desc_nr;
1305 d = &sb->disks[rdev2->desc_nr];
1307 d->number = rdev2->desc_nr;
1308 d->major = MAJOR(rdev2->bdev->bd_dev);
1309 d->minor = MINOR(rdev2->bdev->bd_dev);
1311 d->raid_disk = rdev2->raid_disk;
1313 d->raid_disk = rdev2->desc_nr; /* compatibility */
1314 if (test_bit(Faulty, &rdev2->flags))
1315 d->state = (1<<MD_DISK_FAULTY);
1316 else if (is_active) {
1317 d->state = (1<<MD_DISK_ACTIVE);
1318 if (test_bit(In_sync, &rdev2->flags))
1319 d->state |= (1<<MD_DISK_SYNC);
1327 if (test_bit(WriteMostly, &rdev2->flags))
1328 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1330 /* now set the "removed" and "faulty" bits on any missing devices */
1331 for (i=0 ; i < mddev->raid_disks ; i++) {
1332 mdp_disk_t *d = &sb->disks[i];
1333 if (d->state == 0 && d->number == 0) {
1336 d->state = (1<<MD_DISK_REMOVED);
1337 d->state |= (1<<MD_DISK_FAULTY);
1341 sb->nr_disks = nr_disks;
1342 sb->active_disks = active;
1343 sb->working_disks = working;
1344 sb->failed_disks = failed;
1345 sb->spare_disks = spare;
1347 sb->this_disk = sb->disks[rdev->desc_nr];
1348 sb->sb_csum = calc_sb_csum(sb);
1352 * rdev_size_change for 0.90.0
1354 static unsigned long long
1355 super_90_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors)
1357 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1358 return 0; /* component must fit device */
1359 if (rdev->mddev->bitmap_info.offset)
1360 return 0; /* can't move bitmap */
1361 rdev->sb_start = calc_dev_sboffset(rdev);
1362 if (!num_sectors || num_sectors > rdev->sb_start)
1363 num_sectors = rdev->sb_start;
1364 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1366 md_super_wait(rdev->mddev);
1372 * version 1 superblock
1375 static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb)
1379 unsigned long long newcsum;
1380 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1381 __le32 *isuper = (__le32*)sb;
1384 disk_csum = sb->sb_csum;
1387 for (i=0; size>=4; size -= 4 )
1388 newcsum += le32_to_cpu(*isuper++);
1391 newcsum += le16_to_cpu(*(__le16*) isuper);
1393 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1394 sb->sb_csum = disk_csum;
1395 return cpu_to_le32(csum);
1398 static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
1400 struct mdp_superblock_1 *sb;
1403 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1407 * Calculate the position of the superblock in 512byte sectors.
1408 * It is always aligned to a 4K boundary and
1409 * depeding on minor_version, it can be:
1410 * 0: At least 8K, but less than 12K, from end of device
1411 * 1: At start of device
1412 * 2: 4K from start of device.
1414 switch(minor_version) {
1416 sb_start = i_size_read(rdev->bdev->bd_inode) >> 9;
1418 sb_start &= ~(sector_t)(4*2-1);
1429 rdev->sb_start = sb_start;
1431 /* superblock is rarely larger than 1K, but it can be larger,
1432 * and it is safe to read 4k, so we do that
1434 ret = read_disk_sb(rdev, 4096);
1435 if (ret) return ret;
1438 sb = page_address(rdev->sb_page);
1440 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1441 sb->major_version != cpu_to_le32(1) ||
1442 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1443 le64_to_cpu(sb->super_offset) != rdev->sb_start ||
1444 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1447 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1448 printk("md: invalid superblock checksum on %s\n",
1449 bdevname(rdev->bdev,b));
1452 if (le64_to_cpu(sb->data_size) < 10) {
1453 printk("md: data_size too small on %s\n",
1454 bdevname(rdev->bdev,b));
1458 rdev->preferred_minor = 0xffff;
1459 rdev->data_offset = le64_to_cpu(sb->data_offset);
1460 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1462 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1463 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1464 if (rdev->sb_size & bmask)
1465 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1468 && rdev->data_offset < sb_start + (rdev->sb_size/512))
1471 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1474 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1480 struct mdp_superblock_1 *refsb = page_address(refdev->sb_page);
1482 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1483 sb->level != refsb->level ||
1484 sb->layout != refsb->layout ||
1485 sb->chunksize != refsb->chunksize) {
1486 printk(KERN_WARNING "md: %s has strangely different"
1487 " superblock to %s\n",
1488 bdevname(rdev->bdev,b),
1489 bdevname(refdev->bdev,b2));
1492 ev1 = le64_to_cpu(sb->events);
1493 ev2 = le64_to_cpu(refsb->events);
1501 rdev->sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) -
1502 le64_to_cpu(sb->data_offset);
1504 rdev->sectors = rdev->sb_start;
1505 if (rdev->sectors < le64_to_cpu(sb->data_size))
1507 rdev->sectors = le64_to_cpu(sb->data_size);
1508 if (le64_to_cpu(sb->size) > rdev->sectors)
1513 static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
1515 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
1516 __u64 ev1 = le64_to_cpu(sb->events);
1518 rdev->raid_disk = -1;
1519 clear_bit(Faulty, &rdev->flags);
1520 clear_bit(In_sync, &rdev->flags);
1521 clear_bit(WriteMostly, &rdev->flags);
1523 if (mddev->raid_disks == 0) {
1524 mddev->major_version = 1;
1525 mddev->patch_version = 0;
1526 mddev->external = 0;
1527 mddev->chunk_sectors = le32_to_cpu(sb->chunksize);
1528 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1529 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1530 mddev->level = le32_to_cpu(sb->level);
1531 mddev->clevel[0] = 0;
1532 mddev->layout = le32_to_cpu(sb->layout);
1533 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1534 mddev->dev_sectors = le64_to_cpu(sb->size);
1535 mddev->events = ev1;
1536 mddev->bitmap_info.offset = 0;
1537 mddev->bitmap_info.default_offset = 1024 >> 9;
1539 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1540 memcpy(mddev->uuid, sb->set_uuid, 16);
1542 mddev->max_disks = (4096-256)/2;
1544 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1545 mddev->bitmap_info.file == NULL )
1546 mddev->bitmap_info.offset =
1547 (__s32)le32_to_cpu(sb->bitmap_offset);
1549 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1550 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1551 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1552 mddev->new_level = le32_to_cpu(sb->new_level);
1553 mddev->new_layout = le32_to_cpu(sb->new_layout);
1554 mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk);
1556 mddev->reshape_position = MaxSector;
1557 mddev->delta_disks = 0;
1558 mddev->new_level = mddev->level;
1559 mddev->new_layout = mddev->layout;
1560 mddev->new_chunk_sectors = mddev->chunk_sectors;
1563 } else if (mddev->pers == NULL) {
1564 /* Insist of good event counter while assembling, except for
1565 * spares (which don't need an event count) */
1567 if (rdev->desc_nr >= 0 &&
1568 rdev->desc_nr < le32_to_cpu(sb->max_dev) &&
1569 le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < 0xfffe)
1570 if (ev1 < mddev->events)
1572 } else if (mddev->bitmap) {
1573 /* If adding to array with a bitmap, then we can accept an
1574 * older device, but not too old.
1576 if (ev1 < mddev->bitmap->events_cleared)
1579 if (ev1 < mddev->events)
1580 /* just a hot-add of a new device, leave raid_disk at -1 */
1583 if (mddev->level != LEVEL_MULTIPATH) {
1585 if (rdev->desc_nr < 0 ||
1586 rdev->desc_nr >= le32_to_cpu(sb->max_dev)) {
1590 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1592 case 0xffff: /* spare */
1594 case 0xfffe: /* faulty */
1595 set_bit(Faulty, &rdev->flags);
1598 if ((le32_to_cpu(sb->feature_map) &
1599 MD_FEATURE_RECOVERY_OFFSET))
1600 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1602 set_bit(In_sync, &rdev->flags);
1603 rdev->raid_disk = role;
1606 if (sb->devflags & WriteMostly1)
1607 set_bit(WriteMostly, &rdev->flags);
1608 } else /* MULTIPATH are always insync */
1609 set_bit(In_sync, &rdev->flags);
1614 static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1616 struct mdp_superblock_1 *sb;
1619 /* make rdev->sb match mddev and rdev data. */
1621 sb = page_address(rdev->sb_page);
1623 sb->feature_map = 0;
1625 sb->recovery_offset = cpu_to_le64(0);
1626 memset(sb->pad1, 0, sizeof(sb->pad1));
1627 memset(sb->pad2, 0, sizeof(sb->pad2));
1628 memset(sb->pad3, 0, sizeof(sb->pad3));
1630 sb->utime = cpu_to_le64((__u64)mddev->utime);
1631 sb->events = cpu_to_le64(mddev->events);
1633 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1635 sb->resync_offset = cpu_to_le64(0);
1637 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
1639 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
1640 sb->size = cpu_to_le64(mddev->dev_sectors);
1641 sb->chunksize = cpu_to_le32(mddev->chunk_sectors);
1642 sb->level = cpu_to_le32(mddev->level);
1643 sb->layout = cpu_to_le32(mddev->layout);
1645 if (mddev->bitmap && mddev->bitmap_info.file == NULL) {
1646 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset);
1647 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
1650 if (rdev->raid_disk >= 0 &&
1651 !test_bit(In_sync, &rdev->flags)) {
1653 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1654 sb->recovery_offset =
1655 cpu_to_le64(rdev->recovery_offset);
1658 if (mddev->reshape_position != MaxSector) {
1659 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1660 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1661 sb->new_layout = cpu_to_le32(mddev->new_layout);
1662 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1663 sb->new_level = cpu_to_le32(mddev->new_level);
1664 sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors);
1668 list_for_each_entry(rdev2, &mddev->disks, same_set)
1669 if (rdev2->desc_nr+1 > max_dev)
1670 max_dev = rdev2->desc_nr+1;
1672 if (max_dev > le32_to_cpu(sb->max_dev)) {
1674 sb->max_dev = cpu_to_le32(max_dev);
1675 rdev->sb_size = max_dev * 2 + 256;
1676 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1677 if (rdev->sb_size & bmask)
1678 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1680 max_dev = le32_to_cpu(sb->max_dev);
1682 for (i=0; i<max_dev;i++)
1683 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1685 list_for_each_entry(rdev2, &mddev->disks, same_set) {
1687 if (test_bit(Faulty, &rdev2->flags))
1688 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1689 else if (test_bit(In_sync, &rdev2->flags))
1690 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1691 else if (rdev2->raid_disk >= 0)
1692 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1694 sb->dev_roles[i] = cpu_to_le16(0xffff);
1697 sb->sb_csum = calc_sb_1_csum(sb);
1700 static unsigned long long
1701 super_1_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors)
1703 struct mdp_superblock_1 *sb;
1704 sector_t max_sectors;
1705 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1706 return 0; /* component must fit device */
1707 if (rdev->sb_start < rdev->data_offset) {
1708 /* minor versions 1 and 2; superblock before data */
1709 max_sectors = i_size_read(rdev->bdev->bd_inode) >> 9;
1710 max_sectors -= rdev->data_offset;
1711 if (!num_sectors || num_sectors > max_sectors)
1712 num_sectors = max_sectors;
1713 } else if (rdev->mddev->bitmap_info.offset) {
1714 /* minor version 0 with bitmap we can't move */
1717 /* minor version 0; superblock after data */
1719 sb_start = (i_size_read(rdev->bdev->bd_inode) >> 9) - 8*2;
1720 sb_start &= ~(sector_t)(4*2 - 1);
1721 max_sectors = rdev->sectors + sb_start - rdev->sb_start;
1722 if (!num_sectors || num_sectors > max_sectors)
1723 num_sectors = max_sectors;
1724 rdev->sb_start = sb_start;
1726 sb = page_address(rdev->sb_page);
1727 sb->data_size = cpu_to_le64(num_sectors);
1728 sb->super_offset = rdev->sb_start;
1729 sb->sb_csum = calc_sb_1_csum(sb);
1730 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1732 md_super_wait(rdev->mddev);
1736 static struct super_type super_types[] = {
1739 .owner = THIS_MODULE,
1740 .load_super = super_90_load,
1741 .validate_super = super_90_validate,
1742 .sync_super = super_90_sync,
1743 .rdev_size_change = super_90_rdev_size_change,
1747 .owner = THIS_MODULE,
1748 .load_super = super_1_load,
1749 .validate_super = super_1_validate,
1750 .sync_super = super_1_sync,
1751 .rdev_size_change = super_1_rdev_size_change,
1755 static void sync_super(mddev_t *mddev, mdk_rdev_t *rdev)
1757 if (mddev->sync_super) {
1758 mddev->sync_super(mddev, rdev);
1762 BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types));
1764 super_types[mddev->major_version].sync_super(mddev, rdev);
1767 static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)
1769 mdk_rdev_t *rdev, *rdev2;
1772 rdev_for_each_rcu(rdev, mddev1)
1773 rdev_for_each_rcu(rdev2, mddev2)
1774 if (rdev->bdev->bd_contains ==
1775 rdev2->bdev->bd_contains) {
1783 static LIST_HEAD(pending_raid_disks);
1786 * Try to register data integrity profile for an mddev
1788 * This is called when an array is started and after a disk has been kicked
1789 * from the array. It only succeeds if all working and active component devices
1790 * are integrity capable with matching profiles.
1792 int md_integrity_register(mddev_t *mddev)
1794 mdk_rdev_t *rdev, *reference = NULL;
1796 if (list_empty(&mddev->disks))
1797 return 0; /* nothing to do */
1798 if (!mddev->gendisk || blk_get_integrity(mddev->gendisk))
1799 return 0; /* shouldn't register, or already is */
1800 list_for_each_entry(rdev, &mddev->disks, same_set) {
1801 /* skip spares and non-functional disks */
1802 if (test_bit(Faulty, &rdev->flags))
1804 if (rdev->raid_disk < 0)
1807 /* Use the first rdev as the reference */
1811 /* does this rdev's profile match the reference profile? */
1812 if (blk_integrity_compare(reference->bdev->bd_disk,
1813 rdev->bdev->bd_disk) < 0)
1816 if (!reference || !bdev_get_integrity(reference->bdev))
1819 * All component devices are integrity capable and have matching
1820 * profiles, register the common profile for the md device.
1822 if (blk_integrity_register(mddev->gendisk,
1823 bdev_get_integrity(reference->bdev)) != 0) {
1824 printk(KERN_ERR "md: failed to register integrity for %s\n",
1828 printk(KERN_NOTICE "md: data integrity enabled on %s\n", mdname(mddev));
1829 if (bioset_integrity_create(mddev->bio_set, BIO_POOL_SIZE)) {
1830 printk(KERN_ERR "md: failed to create integrity pool for %s\n",
1836 EXPORT_SYMBOL(md_integrity_register);
1838 /* Disable data integrity if non-capable/non-matching disk is being added */
1839 void md_integrity_add_rdev(mdk_rdev_t *rdev, mddev_t *mddev)
1841 struct blk_integrity *bi_rdev = bdev_get_integrity(rdev->bdev);
1842 struct blk_integrity *bi_mddev = blk_get_integrity(mddev->gendisk);
1844 if (!bi_mddev) /* nothing to do */
1846 if (rdev->raid_disk < 0) /* skip spares */
1848 if (bi_rdev && blk_integrity_compare(mddev->gendisk,
1849 rdev->bdev->bd_disk) >= 0)
1851 printk(KERN_NOTICE "disabling data integrity on %s\n", mdname(mddev));
1852 blk_integrity_unregister(mddev->gendisk);
1854 EXPORT_SYMBOL(md_integrity_add_rdev);
1856 static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
1858 char b[BDEVNAME_SIZE];
1868 /* prevent duplicates */
1869 if (find_rdev(mddev, rdev->bdev->bd_dev))
1872 /* make sure rdev->sectors exceeds mddev->dev_sectors */
1873 if (rdev->sectors && (mddev->dev_sectors == 0 ||
1874 rdev->sectors < mddev->dev_sectors)) {
1876 /* Cannot change size, so fail
1877 * If mddev->level <= 0, then we don't care
1878 * about aligning sizes (e.g. linear)
1880 if (mddev->level > 0)
1883 mddev->dev_sectors = rdev->sectors;
1886 /* Verify rdev->desc_nr is unique.
1887 * If it is -1, assign a free number, else
1888 * check number is not in use
1890 if (rdev->desc_nr < 0) {
1892 if (mddev->pers) choice = mddev->raid_disks;
1893 while (find_rdev_nr(mddev, choice))
1895 rdev->desc_nr = choice;
1897 if (find_rdev_nr(mddev, rdev->desc_nr))
1900 if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) {
1901 printk(KERN_WARNING "md: %s: array is limited to %d devices\n",
1902 mdname(mddev), mddev->max_disks);
1905 bdevname(rdev->bdev,b);
1906 while ( (s=strchr(b, '/')) != NULL)
1909 rdev->mddev = mddev;
1910 printk(KERN_INFO "md: bind<%s>\n", b);
1912 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
1915 ko = &part_to_dev(rdev->bdev->bd_part)->kobj;
1916 if (sysfs_create_link(&rdev->kobj, ko, "block"))
1917 /* failure here is OK */;
1918 rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state");
1920 list_add_rcu(&rdev->same_set, &mddev->disks);
1921 bd_link_disk_holder(rdev->bdev, mddev->gendisk);
1923 /* May as well allow recovery to be retried once */
1924 mddev->recovery_disabled++;
1929 printk(KERN_WARNING "md: failed to register dev-%s for %s\n",
1934 static void md_delayed_delete(struct work_struct *ws)
1936 mdk_rdev_t *rdev = container_of(ws, mdk_rdev_t, del_work);
1937 kobject_del(&rdev->kobj);
1938 kobject_put(&rdev->kobj);
1941 static void unbind_rdev_from_array(mdk_rdev_t * rdev)
1943 char b[BDEVNAME_SIZE];
1948 bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk);
1949 list_del_rcu(&rdev->same_set);
1950 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
1952 sysfs_remove_link(&rdev->kobj, "block");
1953 sysfs_put(rdev->sysfs_state);
1954 rdev->sysfs_state = NULL;
1955 kfree(rdev->badblocks.page);
1956 rdev->badblocks.count = 0;
1957 rdev->badblocks.page = NULL;
1958 /* We need to delay this, otherwise we can deadlock when
1959 * writing to 'remove' to "dev/state". We also need
1960 * to delay it due to rcu usage.
1963 INIT_WORK(&rdev->del_work, md_delayed_delete);
1964 kobject_get(&rdev->kobj);
1965 queue_work(md_misc_wq, &rdev->del_work);
1969 * prevent the device from being mounted, repartitioned or
1970 * otherwise reused by a RAID array (or any other kernel
1971 * subsystem), by bd_claiming the device.
1973 static int lock_rdev(mdk_rdev_t *rdev, dev_t dev, int shared)
1976 struct block_device *bdev;
1977 char b[BDEVNAME_SIZE];
1979 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
1980 shared ? (mdk_rdev_t *)lock_rdev : rdev);
1982 printk(KERN_ERR "md: could not open %s.\n",
1983 __bdevname(dev, b));
1984 return PTR_ERR(bdev);
1990 static void unlock_rdev(mdk_rdev_t *rdev)
1992 struct block_device *bdev = rdev->bdev;
1996 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
1999 void md_autodetect_dev(dev_t dev);
2001 static void export_rdev(mdk_rdev_t * rdev)
2003 char b[BDEVNAME_SIZE];
2004 printk(KERN_INFO "md: export_rdev(%s)\n",
2005 bdevname(rdev->bdev,b));
2010 if (test_bit(AutoDetected, &rdev->flags))
2011 md_autodetect_dev(rdev->bdev->bd_dev);
2014 kobject_put(&rdev->kobj);
2017 static void kick_rdev_from_array(mdk_rdev_t * rdev)
2019 unbind_rdev_from_array(rdev);
2023 static void export_array(mddev_t *mddev)
2025 mdk_rdev_t *rdev, *tmp;
2027 rdev_for_each(rdev, tmp, mddev) {
2032 kick_rdev_from_array(rdev);
2034 if (!list_empty(&mddev->disks))
2036 mddev->raid_disks = 0;
2037 mddev->major_version = 0;
2040 static void print_desc(mdp_disk_t *desc)
2042 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
2043 desc->major,desc->minor,desc->raid_disk,desc->state);
2046 static void print_sb_90(mdp_super_t *sb)
2051 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
2052 sb->major_version, sb->minor_version, sb->patch_version,
2053 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
2055 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
2056 sb->level, sb->size, sb->nr_disks, sb->raid_disks,
2057 sb->md_minor, sb->layout, sb->chunk_size);
2058 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
2059 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
2060 sb->utime, sb->state, sb->active_disks, sb->working_disks,
2061 sb->failed_disks, sb->spare_disks,
2062 sb->sb_csum, (unsigned long)sb->events_lo);
2065 for (i = 0; i < MD_SB_DISKS; i++) {
2068 desc = sb->disks + i;
2069 if (desc->number || desc->major || desc->minor ||
2070 desc->raid_disk || (desc->state && (desc->state != 4))) {
2071 printk(" D %2d: ", i);
2075 printk(KERN_INFO "md: THIS: ");
2076 print_desc(&sb->this_disk);
2079 static void print_sb_1(struct mdp_superblock_1 *sb)
2083 uuid = sb->set_uuid;
2085 "md: SB: (V:%u) (F:0x%08x) Array-ID:<%pU>\n"
2086 "md: Name: \"%s\" CT:%llu\n",
2087 le32_to_cpu(sb->major_version),
2088 le32_to_cpu(sb->feature_map),
2091 (unsigned long long)le64_to_cpu(sb->ctime)
2092 & MD_SUPERBLOCK_1_TIME_SEC_MASK);
2094 uuid = sb->device_uuid;
2096 "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu"
2098 "md: Dev:%08x UUID: %pU\n"
2099 "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n"
2100 "md: (MaxDev:%u) \n",
2101 le32_to_cpu(sb->level),
2102 (unsigned long long)le64_to_cpu(sb->size),
2103 le32_to_cpu(sb->raid_disks),
2104 le32_to_cpu(sb->layout),
2105 le32_to_cpu(sb->chunksize),
2106 (unsigned long long)le64_to_cpu(sb->data_offset),
2107 (unsigned long long)le64_to_cpu(sb->data_size),
2108 (unsigned long long)le64_to_cpu(sb->super_offset),
2109 (unsigned long long)le64_to_cpu(sb->recovery_offset),
2110 le32_to_cpu(sb->dev_number),
2113 (unsigned long long)le64_to_cpu(sb->utime) & MD_SUPERBLOCK_1_TIME_SEC_MASK,
2114 (unsigned long long)le64_to_cpu(sb->events),
2115 (unsigned long long)le64_to_cpu(sb->resync_offset),
2116 le32_to_cpu(sb->sb_csum),
2117 le32_to_cpu(sb->max_dev)
2121 static void print_rdev(mdk_rdev_t *rdev, int major_version)
2123 char b[BDEVNAME_SIZE];
2124 printk(KERN_INFO "md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n",
2125 bdevname(rdev->bdev, b), (unsigned long long)rdev->sectors,
2126 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
2128 if (rdev->sb_loaded) {
2129 printk(KERN_INFO "md: rdev superblock (MJ:%d):\n", major_version);
2130 switch (major_version) {
2132 print_sb_90(page_address(rdev->sb_page));
2135 print_sb_1(page_address(rdev->sb_page));
2139 printk(KERN_INFO "md: no rdev superblock!\n");
2142 static void md_print_devices(void)
2144 struct list_head *tmp;
2147 char b[BDEVNAME_SIZE];
2150 printk("md: **********************************\n");
2151 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
2152 printk("md: **********************************\n");
2153 for_each_mddev(mddev, tmp) {
2156 bitmap_print_sb(mddev->bitmap);
2158 printk("%s: ", mdname(mddev));
2159 list_for_each_entry(rdev, &mddev->disks, same_set)
2160 printk("<%s>", bdevname(rdev->bdev,b));
2163 list_for_each_entry(rdev, &mddev->disks, same_set)
2164 print_rdev(rdev, mddev->major_version);
2166 printk("md: **********************************\n");
2171 static void sync_sbs(mddev_t * mddev, int nospares)
2173 /* Update each superblock (in-memory image), but
2174 * if we are allowed to, skip spares which already
2175 * have the right event counter, or have one earlier
2176 * (which would mean they aren't being marked as dirty
2177 * with the rest of the array)
2180 list_for_each_entry(rdev, &mddev->disks, same_set) {
2181 if (rdev->sb_events == mddev->events ||
2183 rdev->raid_disk < 0 &&
2184 rdev->sb_events+1 == mddev->events)) {
2185 /* Don't update this superblock */
2186 rdev->sb_loaded = 2;
2188 sync_super(mddev, rdev);
2189 rdev->sb_loaded = 1;
2194 static void md_update_sb(mddev_t * mddev, int force_change)
2201 /* First make sure individual recovery_offsets are correct */
2202 list_for_each_entry(rdev, &mddev->disks, same_set) {
2203 if (rdev->raid_disk >= 0 &&
2204 mddev->delta_disks >= 0 &&
2205 !test_bit(In_sync, &rdev->flags) &&
2206 mddev->curr_resync_completed > rdev->recovery_offset)
2207 rdev->recovery_offset = mddev->curr_resync_completed;
2210 if (!mddev->persistent) {
2211 clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
2212 clear_bit(MD_CHANGE_DEVS, &mddev->flags);
2213 if (!mddev->external)
2214 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2215 wake_up(&mddev->sb_wait);
2219 spin_lock_irq(&mddev->write_lock);
2221 mddev->utime = get_seconds();
2223 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
2225 if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags))
2226 /* just a clean<-> dirty transition, possibly leave spares alone,
2227 * though if events isn't the right even/odd, we will have to do
2233 if (mddev->degraded)
2234 /* If the array is degraded, then skipping spares is both
2235 * dangerous and fairly pointless.
2236 * Dangerous because a device that was removed from the array
2237 * might have a event_count that still looks up-to-date,
2238 * so it can be re-added without a resync.
2239 * Pointless because if there are any spares to skip,
2240 * then a recovery will happen and soon that array won't
2241 * be degraded any more and the spare can go back to sleep then.
2245 sync_req = mddev->in_sync;
2247 /* If this is just a dirty<->clean transition, and the array is clean
2248 * and 'events' is odd, we can roll back to the previous clean state */
2250 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
2251 && mddev->can_decrease_events
2252 && mddev->events != 1) {
2254 mddev->can_decrease_events = 0;
2256 /* otherwise we have to go forward and ... */
2258 mddev->can_decrease_events = nospares;
2261 if (!mddev->events) {
2263 * oops, this 64-bit counter should never wrap.
2264 * Either we are in around ~1 trillion A.C., assuming
2265 * 1 reboot per second, or we have a bug:
2270 sync_sbs(mddev, nospares);
2271 spin_unlock_irq(&mddev->write_lock);
2274 "md: updating %s RAID superblock on device (in sync %d)\n",
2275 mdname(mddev),mddev->in_sync);
2277 bitmap_update_sb(mddev->bitmap);
2278 list_for_each_entry(rdev, &mddev->disks, same_set) {
2279 char b[BDEVNAME_SIZE];
2280 dprintk(KERN_INFO "md: ");
2281 if (rdev->sb_loaded != 1)
2282 continue; /* no noise on spare devices */
2283 if (test_bit(Faulty, &rdev->flags))
2284 dprintk("(skipping faulty ");
2286 dprintk("%s ", bdevname(rdev->bdev,b));
2287 if (!test_bit(Faulty, &rdev->flags)) {
2288 md_super_write(mddev,rdev,
2289 rdev->sb_start, rdev->sb_size,
2291 dprintk(KERN_INFO "(write) %s's sb offset: %llu\n",
2292 bdevname(rdev->bdev,b),
2293 (unsigned long long)rdev->sb_start);
2294 rdev->sb_events = mddev->events;
2298 if (mddev->level == LEVEL_MULTIPATH)
2299 /* only need to write one superblock... */
2302 md_super_wait(mddev);
2303 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2305 spin_lock_irq(&mddev->write_lock);
2306 if (mddev->in_sync != sync_req ||
2307 test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
2308 /* have to write it out again */
2309 spin_unlock_irq(&mddev->write_lock);
2312 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2313 spin_unlock_irq(&mddev->write_lock);
2314 wake_up(&mddev->sb_wait);
2315 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
2316 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
2320 /* words written to sysfs files may, or may not, be \n terminated.
2321 * We want to accept with case. For this we use cmd_match.
2323 static int cmd_match(const char *cmd, const char *str)
2325 /* See if cmd, written into a sysfs file, matches
2326 * str. They must either be the same, or cmd can
2327 * have a trailing newline
2329 while (*cmd && *str && *cmd == *str) {
2340 struct rdev_sysfs_entry {
2341 struct attribute attr;
2342 ssize_t (*show)(mdk_rdev_t *, char *);
2343 ssize_t (*store)(mdk_rdev_t *, const char *, size_t);
2347 state_show(mdk_rdev_t *rdev, char *page)
2352 if (test_bit(Faulty, &rdev->flags)) {
2353 len+= sprintf(page+len, "%sfaulty",sep);
2356 if (test_bit(In_sync, &rdev->flags)) {
2357 len += sprintf(page+len, "%sin_sync",sep);
2360 if (test_bit(WriteMostly, &rdev->flags)) {
2361 len += sprintf(page+len, "%swrite_mostly",sep);
2364 if (test_bit(Blocked, &rdev->flags)) {
2365 len += sprintf(page+len, "%sblocked", sep);
2368 if (!test_bit(Faulty, &rdev->flags) &&
2369 !test_bit(In_sync, &rdev->flags)) {
2370 len += sprintf(page+len, "%sspare", sep);
2373 return len+sprintf(page+len, "\n");
2377 state_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2380 * faulty - simulates and error
2381 * remove - disconnects the device
2382 * writemostly - sets write_mostly
2383 * -writemostly - clears write_mostly
2384 * blocked - sets the Blocked flag
2385 * -blocked - clears the Blocked flag
2386 * insync - sets Insync providing device isn't active
2389 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
2390 md_error(rdev->mddev, rdev);
2392 } else if (cmd_match(buf, "remove")) {
2393 if (rdev->raid_disk >= 0)
2396 mddev_t *mddev = rdev->mddev;
2397 kick_rdev_from_array(rdev);
2399 md_update_sb(mddev, 1);
2400 md_new_event(mddev);
2403 } else if (cmd_match(buf, "writemostly")) {
2404 set_bit(WriteMostly, &rdev->flags);
2406 } else if (cmd_match(buf, "-writemostly")) {
2407 clear_bit(WriteMostly, &rdev->flags);
2409 } else if (cmd_match(buf, "blocked")) {
2410 set_bit(Blocked, &rdev->flags);
2412 } else if (cmd_match(buf, "-blocked")) {
2413 clear_bit(Blocked, &rdev->flags);
2414 wake_up(&rdev->blocked_wait);
2415 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2416 md_wakeup_thread(rdev->mddev->thread);
2419 } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) {
2420 set_bit(In_sync, &rdev->flags);
2424 sysfs_notify_dirent_safe(rdev->sysfs_state);
2425 return err ? err : len;
2427 static struct rdev_sysfs_entry rdev_state =
2428 __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store);
2431 errors_show(mdk_rdev_t *rdev, char *page)
2433 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
2437 errors_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2440 unsigned long n = simple_strtoul(buf, &e, 10);
2441 if (*buf && (*e == 0 || *e == '\n')) {
2442 atomic_set(&rdev->corrected_errors, n);
2447 static struct rdev_sysfs_entry rdev_errors =
2448 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
2451 slot_show(mdk_rdev_t *rdev, char *page)
2453 if (rdev->raid_disk < 0)
2454 return sprintf(page, "none\n");
2456 return sprintf(page, "%d\n", rdev->raid_disk);
2460 slot_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2464 int slot = simple_strtoul(buf, &e, 10);
2465 if (strncmp(buf, "none", 4)==0)
2467 else if (e==buf || (*e && *e!= '\n'))
2469 if (rdev->mddev->pers && slot == -1) {
2470 /* Setting 'slot' on an active array requires also
2471 * updating the 'rd%d' link, and communicating
2472 * with the personality with ->hot_*_disk.
2473 * For now we only support removing
2474 * failed/spare devices. This normally happens automatically,
2475 * but not when the metadata is externally managed.
2477 if (rdev->raid_disk == -1)
2479 /* personality does all needed checks */
2480 if (rdev->mddev->pers->hot_remove_disk == NULL)
2482 err = rdev->mddev->pers->
2483 hot_remove_disk(rdev->mddev, rdev->raid_disk);
2486 sysfs_unlink_rdev(rdev->mddev, rdev);
2487 rdev->raid_disk = -1;
2488 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2489 md_wakeup_thread(rdev->mddev->thread);
2490 } else if (rdev->mddev->pers) {
2492 /* Activating a spare .. or possibly reactivating
2493 * if we ever get bitmaps working here.
2496 if (rdev->raid_disk != -1)
2499 if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery))
2502 if (rdev->mddev->pers->hot_add_disk == NULL)
2505 list_for_each_entry(rdev2, &rdev->mddev->disks, same_set)
2506 if (rdev2->raid_disk == slot)
2509 if (slot >= rdev->mddev->raid_disks &&
2510 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
2513 rdev->raid_disk = slot;
2514 if (test_bit(In_sync, &rdev->flags))
2515 rdev->saved_raid_disk = slot;
2517 rdev->saved_raid_disk = -1;
2518 err = rdev->mddev->pers->
2519 hot_add_disk(rdev->mddev, rdev);
2521 rdev->raid_disk = -1;
2524 sysfs_notify_dirent_safe(rdev->sysfs_state);
2525 if (sysfs_link_rdev(rdev->mddev, rdev))
2526 /* failure here is OK */;
2527 /* don't wakeup anyone, leave that to userspace. */
2529 if (slot >= rdev->mddev->raid_disks &&
2530 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
2532 rdev->raid_disk = slot;
2533 /* assume it is working */
2534 clear_bit(Faulty, &rdev->flags);
2535 clear_bit(WriteMostly, &rdev->flags);
2536 set_bit(In_sync, &rdev->flags);
2537 sysfs_notify_dirent_safe(rdev->sysfs_state);
2543 static struct rdev_sysfs_entry rdev_slot =
2544 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
2547 offset_show(mdk_rdev_t *rdev, char *page)
2549 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
2553 offset_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2556 unsigned long long offset = simple_strtoull(buf, &e, 10);
2557 if (e==buf || (*e && *e != '\n'))
2559 if (rdev->mddev->pers && rdev->raid_disk >= 0)
2561 if (rdev->sectors && rdev->mddev->external)
2562 /* Must set offset before size, so overlap checks
2565 rdev->data_offset = offset;
2569 static struct rdev_sysfs_entry rdev_offset =
2570 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
2573 rdev_size_show(mdk_rdev_t *rdev, char *page)
2575 return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2);
2578 static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
2580 /* check if two start/length pairs overlap */
2588 static int strict_blocks_to_sectors(const char *buf, sector_t *sectors)
2590 unsigned long long blocks;
2593 if (strict_strtoull(buf, 10, &blocks) < 0)
2596 if (blocks & 1ULL << (8 * sizeof(blocks) - 1))
2597 return -EINVAL; /* sector conversion overflow */
2600 if (new != blocks * 2)
2601 return -EINVAL; /* unsigned long long to sector_t overflow */
2608 rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2610 mddev_t *my_mddev = rdev->mddev;
2611 sector_t oldsectors = rdev->sectors;
2614 if (strict_blocks_to_sectors(buf, §ors) < 0)
2616 if (my_mddev->pers && rdev->raid_disk >= 0) {
2617 if (my_mddev->persistent) {
2618 sectors = super_types[my_mddev->major_version].
2619 rdev_size_change(rdev, sectors);
2622 } else if (!sectors)
2623 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) -
2626 if (sectors < my_mddev->dev_sectors)
2627 return -EINVAL; /* component must fit device */
2629 rdev->sectors = sectors;
2630 if (sectors > oldsectors && my_mddev->external) {
2631 /* need to check that all other rdevs with the same ->bdev
2632 * do not overlap. We need to unlock the mddev to avoid
2633 * a deadlock. We have already changed rdev->sectors, and if
2634 * we have to change it back, we will have the lock again.
2638 struct list_head *tmp;
2640 mddev_unlock(my_mddev);
2641 for_each_mddev(mddev, tmp) {
2645 list_for_each_entry(rdev2, &mddev->disks, same_set)
2646 if (rdev->bdev == rdev2->bdev &&
2648 overlaps(rdev->data_offset, rdev->sectors,
2654 mddev_unlock(mddev);
2660 mddev_lock(my_mddev);
2662 /* Someone else could have slipped in a size
2663 * change here, but doing so is just silly.
2664 * We put oldsectors back because we *know* it is
2665 * safe, and trust userspace not to race with
2668 rdev->sectors = oldsectors;
2675 static struct rdev_sysfs_entry rdev_size =
2676 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
2679 static ssize_t recovery_start_show(mdk_rdev_t *rdev, char *page)
2681 unsigned long long recovery_start = rdev->recovery_offset;
2683 if (test_bit(In_sync, &rdev->flags) ||
2684 recovery_start == MaxSector)
2685 return sprintf(page, "none\n");
2687 return sprintf(page, "%llu\n", recovery_start);
2690 static ssize_t recovery_start_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2692 unsigned long long recovery_start;
2694 if (cmd_match(buf, "none"))
2695 recovery_start = MaxSector;
2696 else if (strict_strtoull(buf, 10, &recovery_start))
2699 if (rdev->mddev->pers &&
2700 rdev->raid_disk >= 0)
2703 rdev->recovery_offset = recovery_start;
2704 if (recovery_start == MaxSector)
2705 set_bit(In_sync, &rdev->flags);
2707 clear_bit(In_sync, &rdev->flags);
2711 static struct rdev_sysfs_entry rdev_recovery_start =
2712 __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store);
2714 static struct attribute *rdev_default_attrs[] = {
2720 &rdev_recovery_start.attr,
2724 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
2726 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2727 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
2728 mddev_t *mddev = rdev->mddev;
2734 rv = mddev ? mddev_lock(mddev) : -EBUSY;
2736 if (rdev->mddev == NULL)
2739 rv = entry->show(rdev, page);
2740 mddev_unlock(mddev);
2746 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
2747 const char *page, size_t length)
2749 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2750 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
2752 mddev_t *mddev = rdev->mddev;
2756 if (!capable(CAP_SYS_ADMIN))
2758 rv = mddev ? mddev_lock(mddev): -EBUSY;
2760 if (rdev->mddev == NULL)
2763 rv = entry->store(rdev, page, length);
2764 mddev_unlock(mddev);
2769 static void rdev_free(struct kobject *ko)
2771 mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj);
2774 static const struct sysfs_ops rdev_sysfs_ops = {
2775 .show = rdev_attr_show,
2776 .store = rdev_attr_store,
2778 static struct kobj_type rdev_ktype = {
2779 .release = rdev_free,
2780 .sysfs_ops = &rdev_sysfs_ops,
2781 .default_attrs = rdev_default_attrs,
2784 int md_rdev_init(mdk_rdev_t *rdev)
2787 rdev->saved_raid_disk = -1;
2788 rdev->raid_disk = -1;
2790 rdev->data_offset = 0;
2791 rdev->sb_events = 0;
2792 rdev->last_read_error.tv_sec = 0;
2793 rdev->last_read_error.tv_nsec = 0;
2794 atomic_set(&rdev->nr_pending, 0);
2795 atomic_set(&rdev->read_errors, 0);
2796 atomic_set(&rdev->corrected_errors, 0);
2798 INIT_LIST_HEAD(&rdev->same_set);
2799 init_waitqueue_head(&rdev->blocked_wait);
2801 /* Add space to store bad block list.
2802 * This reserves the space even on arrays where it cannot
2803 * be used - I wonder if that matters
2805 rdev->badblocks.count = 0;
2806 rdev->badblocks.shift = 0;
2807 rdev->badblocks.page = kmalloc(PAGE_SIZE, GFP_KERNEL);
2808 seqlock_init(&rdev->badblocks.lock);
2809 if (rdev->badblocks.page == NULL)
2814 EXPORT_SYMBOL_GPL(md_rdev_init);
2816 * Import a device. If 'super_format' >= 0, then sanity check the superblock
2818 * mark the device faulty if:
2820 * - the device is nonexistent (zero size)
2821 * - the device has no valid superblock
2823 * a faulty rdev _never_ has rdev->sb set.
2825 static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor)
2827 char b[BDEVNAME_SIZE];
2832 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
2834 printk(KERN_ERR "md: could not alloc mem for new device!\n");
2835 return ERR_PTR(-ENOMEM);
2838 err = md_rdev_init(rdev);
2841 err = alloc_disk_sb(rdev);
2845 err = lock_rdev(rdev, newdev, super_format == -2);
2849 kobject_init(&rdev->kobj, &rdev_ktype);
2851 size = i_size_read(rdev->bdev->bd_inode) >> BLOCK_SIZE_BITS;
2854 "md: %s has zero or unknown size, marking faulty!\n",
2855 bdevname(rdev->bdev,b));
2860 if (super_format >= 0) {
2861 err = super_types[super_format].
2862 load_super(rdev, NULL, super_minor);
2863 if (err == -EINVAL) {
2865 "md: %s does not have a valid v%d.%d "
2866 "superblock, not importing!\n",
2867 bdevname(rdev->bdev,b),
2868 super_format, super_minor);
2873 "md: could not read %s's sb, not importing!\n",
2874 bdevname(rdev->bdev,b));
2882 if (rdev->sb_page) {
2887 kfree(rdev->badblocks.page);
2889 return ERR_PTR(err);
2893 * Check a full RAID array for plausibility
2897 static void analyze_sbs(mddev_t * mddev)
2900 mdk_rdev_t *rdev, *freshest, *tmp;
2901 char b[BDEVNAME_SIZE];
2904 rdev_for_each(rdev, tmp, mddev)
2905 switch (super_types[mddev->major_version].
2906 load_super(rdev, freshest, mddev->minor_version)) {
2914 "md: fatal superblock inconsistency in %s"
2915 " -- removing from array\n",
2916 bdevname(rdev->bdev,b));
2917 kick_rdev_from_array(rdev);
2921 super_types[mddev->major_version].
2922 validate_super(mddev, freshest);
2925 rdev_for_each(rdev, tmp, mddev) {
2926 if (mddev->max_disks &&
2927 (rdev->desc_nr >= mddev->max_disks ||
2928 i > mddev->max_disks)) {
2930 "md: %s: %s: only %d devices permitted\n",
2931 mdname(mddev), bdevname(rdev->bdev, b),
2933 kick_rdev_from_array(rdev);
2936 if (rdev != freshest)
2937 if (super_types[mddev->major_version].
2938 validate_super(mddev, rdev)) {
2939 printk(KERN_WARNING "md: kicking non-fresh %s"
2941 bdevname(rdev->bdev,b));
2942 kick_rdev_from_array(rdev);
2945 if (mddev->level == LEVEL_MULTIPATH) {
2946 rdev->desc_nr = i++;
2947 rdev->raid_disk = rdev->desc_nr;
2948 set_bit(In_sync, &rdev->flags);
2949 } else if (rdev->raid_disk >= (mddev->raid_disks - min(0, mddev->delta_disks))) {
2950 rdev->raid_disk = -1;
2951 clear_bit(In_sync, &rdev->flags);
2956 /* Read a fixed-point number.
2957 * Numbers in sysfs attributes should be in "standard" units where
2958 * possible, so time should be in seconds.
2959 * However we internally use a a much smaller unit such as
2960 * milliseconds or jiffies.
2961 * This function takes a decimal number with a possible fractional
2962 * component, and produces an integer which is the result of
2963 * multiplying that number by 10^'scale'.
2964 * all without any floating-point arithmetic.
2966 int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale)
2968 unsigned long result = 0;
2970 while (isdigit(*cp) || (*cp == '.' && decimals < 0)) {
2973 else if (decimals < scale) {
2976 result = result * 10 + value;
2988 while (decimals < scale) {
2997 static void md_safemode_timeout(unsigned long data);
3000 safe_delay_show(mddev_t *mddev, char *page)
3002 int msec = (mddev->safemode_delay*1000)/HZ;
3003 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
3006 safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len)
3010 if (strict_strtoul_scaled(cbuf, &msec, 3) < 0)
3013 mddev->safemode_delay = 0;
3015 unsigned long old_delay = mddev->safemode_delay;
3016 mddev->safemode_delay = (msec*HZ)/1000;
3017 if (mddev->safemode_delay == 0)
3018 mddev->safemode_delay = 1;
3019 if (mddev->safemode_delay < old_delay)
3020 md_safemode_timeout((unsigned long)mddev);
3024 static struct md_sysfs_entry md_safe_delay =
3025 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
3028 level_show(mddev_t *mddev, char *page)
3030 struct mdk_personality *p = mddev->pers;
3032 return sprintf(page, "%s\n", p->name);
3033 else if (mddev->clevel[0])
3034 return sprintf(page, "%s\n", mddev->clevel);
3035 else if (mddev->level != LEVEL_NONE)
3036 return sprintf(page, "%d\n", mddev->level);
3042 level_store(mddev_t *mddev, const char *buf, size_t len)
3046 struct mdk_personality *pers;
3051 if (mddev->pers == NULL) {
3054 if (len >= sizeof(mddev->clevel))
3056 strncpy(mddev->clevel, buf, len);
3057 if (mddev->clevel[len-1] == '\n')
3059 mddev->clevel[len] = 0;
3060 mddev->level = LEVEL_NONE;
3064 /* request to change the personality. Need to ensure:
3065 * - array is not engaged in resync/recovery/reshape
3066 * - old personality can be suspended
3067 * - new personality will access other array.
3070 if (mddev->sync_thread ||
3071 mddev->reshape_position != MaxSector ||
3072 mddev->sysfs_active)
3075 if (!mddev->pers->quiesce) {
3076 printk(KERN_WARNING "md: %s: %s does not support online personality change\n",
3077 mdname(mddev), mddev->pers->name);
3081 /* Now find the new personality */
3082 if (len == 0 || len >= sizeof(clevel))
3084 strncpy(clevel, buf, len);
3085 if (clevel[len-1] == '\n')
3088 if (strict_strtol(clevel, 10, &level))
3091 if (request_module("md-%s", clevel) != 0)
3092 request_module("md-level-%s", clevel);
3093 spin_lock(&pers_lock);
3094 pers = find_pers(level, clevel);
3095 if (!pers || !try_module_get(pers->owner)) {
3096 spin_unlock(&pers_lock);
3097 printk(KERN_WARNING "md: personality %s not loaded\n", clevel);
3100 spin_unlock(&pers_lock);
3102 if (pers == mddev->pers) {
3103 /* Nothing to do! */
3104 module_put(pers->owner);
3107 if (!pers->takeover) {
3108 module_put(pers->owner);
3109 printk(KERN_WARNING "md: %s: %s does not support personality takeover\n",
3110 mdname(mddev), clevel);
3114 list_for_each_entry(rdev, &mddev->disks, same_set)
3115 rdev->new_raid_disk = rdev->raid_disk;
3117 /* ->takeover must set new_* and/or delta_disks
3118 * if it succeeds, and may set them when it fails.
3120 priv = pers->takeover(mddev);
3122 mddev->new_level = mddev->level;
3123 mddev->new_layout = mddev->layout;
3124 mddev->new_chunk_sectors = mddev->chunk_sectors;
3125 mddev->raid_disks -= mddev->delta_disks;
3126 mddev->delta_disks = 0;
3127 module_put(pers->owner);
3128 printk(KERN_WARNING "md: %s: %s would not accept array\n",
3129 mdname(mddev), clevel);
3130 return PTR_ERR(priv);
3133 /* Looks like we have a winner */
3134 mddev_suspend(mddev);
3135 mddev->pers->stop(mddev);
3137 if (mddev->pers->sync_request == NULL &&
3138 pers->sync_request != NULL) {
3139 /* need to add the md_redundancy_group */
3140 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
3142 "md: cannot register extra attributes for %s\n",
3144 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, NULL, "sync_action");
3146 if (mddev->pers->sync_request != NULL &&
3147 pers->sync_request == NULL) {
3148 /* need to remove the md_redundancy_group */
3149 if (mddev->to_remove == NULL)
3150 mddev->to_remove = &md_redundancy_group;
3153 if (mddev->pers->sync_request == NULL &&
3155 /* We are converting from a no-redundancy array
3156 * to a redundancy array and metadata is managed
3157 * externally so we need to be sure that writes
3158 * won't block due to a need to transition
3160 * until external management is started.
3163 mddev->safemode_delay = 0;
3164 mddev->safemode = 0;
3167 list_for_each_entry(rdev, &mddev->disks, same_set) {
3168 if (rdev->raid_disk < 0)
3170 if (rdev->new_raid_disk >= mddev->raid_disks)
3171 rdev->new_raid_disk = -1;
3172 if (rdev->new_raid_disk == rdev->raid_disk)
3174 sysfs_unlink_rdev(mddev, rdev);
3176 list_for_each_entry(rdev, &mddev->disks, same_set) {
3177 if (rdev->raid_disk < 0)
3179 if (rdev->new_raid_disk == rdev->raid_disk)
3181 rdev->raid_disk = rdev->new_raid_disk;
3182 if (rdev->raid_disk < 0)
3183 clear_bit(In_sync, &rdev->flags);
3185 if (sysfs_link_rdev(mddev, rdev))
3186 printk(KERN_WARNING "md: cannot register rd%d"
3187 " for %s after level change\n",
3188 rdev->raid_disk, mdname(mddev));
3192 module_put(mddev->pers->owner);
3194 mddev->private = priv;
3195 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
3196 mddev->level = mddev->new_level;
3197 mddev->layout = mddev->new_layout;
3198 mddev->chunk_sectors = mddev->new_chunk_sectors;
3199 mddev->delta_disks = 0;
3200 mddev->degraded = 0;
3201 if (mddev->pers->sync_request == NULL) {
3202 /* this is now an array without redundancy, so
3203 * it must always be in_sync
3206 del_timer_sync(&mddev->safemode_timer);
3209 mddev_resume(mddev);
3210 set_bit(MD_CHANGE_DEVS, &mddev->flags);
3211 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3212 md_wakeup_thread(mddev->thread);
3213 sysfs_notify(&mddev->kobj, NULL, "level");
3214 md_new_event(mddev);
3218 static struct md_sysfs_entry md_level =
3219 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
3223 layout_show(mddev_t *mddev, char *page)
3225 /* just a number, not meaningful for all levels */
3226 if (mddev->reshape_position != MaxSector &&
3227 mddev->layout != mddev->new_layout)
3228 return sprintf(page, "%d (%d)\n",
3229 mddev->new_layout, mddev->layout);
3230 return sprintf(page, "%d\n", mddev->layout);
3234 layout_store(mddev_t *mddev, const char *buf, size_t len)
3237 unsigned long n = simple_strtoul(buf, &e, 10);
3239 if (!*buf || (*e && *e != '\n'))
3244 if (mddev->pers->check_reshape == NULL)
3246 mddev->new_layout = n;
3247 err = mddev->pers->check_reshape(mddev);
3249 mddev->new_layout = mddev->layout;
3253 mddev->new_layout = n;
3254 if (mddev->reshape_position == MaxSector)
3259 static struct md_sysfs_entry md_layout =
3260 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
3264 raid_disks_show(mddev_t *mddev, char *page)
3266 if (mddev->raid_disks == 0)
3268 if (mddev->reshape_position != MaxSector &&
3269 mddev->delta_disks != 0)
3270 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
3271 mddev->raid_disks - mddev->delta_disks);
3272 return sprintf(page, "%d\n", mddev->raid_disks);
3275 static int update_raid_disks(mddev_t *mddev, int raid_disks);
3278 raid_disks_store(mddev_t *mddev, const char *buf, size_t len)
3282 unsigned long n = simple_strtoul(buf, &e, 10);
3284 if (!*buf || (*e && *e != '\n'))
3288 rv = update_raid_disks(mddev, n);
3289 else if (mddev->reshape_position != MaxSector) {
3290 int olddisks = mddev->raid_disks - mddev->delta_disks;
3291 mddev->delta_disks = n - olddisks;
3292 mddev->raid_disks = n;
3294 mddev->raid_disks = n;
3295 return rv ? rv : len;
3297 static struct md_sysfs_entry md_raid_disks =
3298 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
3301 chunk_size_show(mddev_t *mddev, char *page)
3303 if (mddev->reshape_position != MaxSector &&
3304 mddev->chunk_sectors != mddev->new_chunk_sectors)
3305 return sprintf(page, "%d (%d)\n",
3306 mddev->new_chunk_sectors << 9,
3307 mddev->chunk_sectors << 9);
3308 return sprintf(page, "%d\n", mddev->chunk_sectors << 9);
3312 chunk_size_store(mddev_t *mddev, const char *buf, size_t len)
3315 unsigned long n = simple_strtoul(buf, &e, 10);
3317 if (!*buf || (*e && *e != '\n'))
3322 if (mddev->pers->check_reshape == NULL)
3324 mddev->new_chunk_sectors = n >> 9;
3325 err = mddev->pers->check_reshape(mddev);
3327 mddev->new_chunk_sectors = mddev->chunk_sectors;
3331 mddev->new_chunk_sectors = n >> 9;
3332 if (mddev->reshape_position == MaxSector)
3333 mddev->chunk_sectors = n >> 9;
3337 static struct md_sysfs_entry md_chunk_size =
3338 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
3341 resync_start_show(mddev_t *mddev, char *page)
3343 if (mddev->recovery_cp == MaxSector)
3344 return sprintf(page, "none\n");
3345 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
3349 resync_start_store(mddev_t *mddev, const char *buf, size_t len)
3352 unsigned long long n = simple_strtoull(buf, &e, 10);
3354 if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
3356 if (cmd_match(buf, "none"))
3358 else if (!*buf || (*e && *e != '\n'))
3361 mddev->recovery_cp = n;
3364 static struct md_sysfs_entry md_resync_start =
3365 __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store);
3368 * The array state can be:
3371 * No devices, no size, no level
3372 * Equivalent to STOP_ARRAY ioctl
3374 * May have some settings, but array is not active
3375 * all IO results in error
3376 * When written, doesn't tear down array, but just stops it
3377 * suspended (not supported yet)
3378 * All IO requests will block. The array can be reconfigured.
3379 * Writing this, if accepted, will block until array is quiescent
3381 * no resync can happen. no superblocks get written.
3382 * write requests fail
3384 * like readonly, but behaves like 'clean' on a write request.
3386 * clean - no pending writes, but otherwise active.
3387 * When written to inactive array, starts without resync
3388 * If a write request arrives then
3389 * if metadata is known, mark 'dirty' and switch to 'active'.
3390 * if not known, block and switch to write-pending
3391 * If written to an active array that has pending writes, then fails.
3393 * fully active: IO and resync can be happening.
3394 * When written to inactive array, starts with resync
3397 * clean, but writes are blocked waiting for 'active' to be written.
3400 * like active, but no writes have been seen for a while (100msec).
3403 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
3404 write_pending, active_idle, bad_word};
3405 static char *array_states[] = {
3406 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3407 "write-pending", "active-idle", NULL };
3409 static int match_word(const char *word, char **list)
3412 for (n=0; list[n]; n++)
3413 if (cmd_match(word, list[n]))
3419 array_state_show(mddev_t *mddev, char *page)
3421 enum array_state st = inactive;
3434 else if (test_bit(MD_CHANGE_PENDING, &mddev->flags))
3436 else if (mddev->safemode)
3442 if (list_empty(&mddev->disks) &&
3443 mddev->raid_disks == 0 &&
3444 mddev->dev_sectors == 0)
3449 return sprintf(page, "%s\n", array_states[st]);
3452 static int do_md_stop(mddev_t * mddev, int ro, int is_open);
3453 static int md_set_readonly(mddev_t * mddev, int is_open);
3454 static int do_md_run(mddev_t * mddev);
3455 static int restart_array(mddev_t *mddev);
3458 array_state_store(mddev_t *mddev, const char *buf, size_t len)
3461 enum array_state st = match_word(buf, array_states);
3466 /* stopping an active array */
3467 if (atomic_read(&mddev->openers) > 0)
3469 err = do_md_stop(mddev, 0, 0);
3472 /* stopping an active array */
3474 if (atomic_read(&mddev->openers) > 0)
3476 err = do_md_stop(mddev, 2, 0);
3478 err = 0; /* already inactive */
3481 break; /* not supported yet */
3484 err = md_set_readonly(mddev, 0);
3487 set_disk_ro(mddev->gendisk, 1);
3488 err = do_md_run(mddev);
3494 err = md_set_readonly(mddev, 0);
3495 else if (mddev->ro == 1)
3496 err = restart_array(mddev);
3499 set_disk_ro(mddev->gendisk, 0);
3503 err = do_md_run(mddev);
3508 restart_array(mddev);
3509 spin_lock_irq(&mddev->write_lock);
3510 if (atomic_read(&mddev->writes_pending) == 0) {
3511 if (mddev->in_sync == 0) {
3513 if (mddev->safemode == 1)
3514 mddev->safemode = 0;
3515 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
3520 spin_unlock_irq(&mddev->write_lock);
3526 restart_array(mddev);
3527 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
3528 wake_up(&mddev->sb_wait);
3532 set_disk_ro(mddev->gendisk, 0);
3533 err = do_md_run(mddev);
3538 /* these cannot be set */
3544 sysfs_notify_dirent_safe(mddev->sysfs_state);
3548 static struct md_sysfs_entry md_array_state =
3549 __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
3552 max_corrected_read_errors_show(mddev_t *mddev, char *page) {
3553 return sprintf(page, "%d\n",
3554 atomic_read(&mddev->max_corr_read_errors));
3558 max_corrected_read_errors_store(mddev_t *mddev, const char *buf, size_t len)
3561 unsigned long n = simple_strtoul(buf, &e, 10);
3563 if (*buf && (*e == 0 || *e == '\n')) {
3564 atomic_set(&mddev->max_corr_read_errors, n);
3570 static struct md_sysfs_entry max_corr_read_errors =
3571 __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show,
3572 max_corrected_read_errors_store);
3575 null_show(mddev_t *mddev, char *page)
3581 new_dev_store(mddev_t *mddev, const char *buf, size_t len)
3583 /* buf must be %d:%d\n? giving major and minor numbers */
3584 /* The new device is added to the array.
3585 * If the array has a persistent superblock, we read the
3586 * superblock to initialise info and check validity.
3587 * Otherwise, only checking done is that in bind_rdev_to_array,
3588 * which mainly checks size.
3591 int major = simple_strtoul(buf, &e, 10);
3597 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
3599 minor = simple_strtoul(e+1, &e, 10);
3600 if (*e && *e != '\n')
3602 dev = MKDEV(major, minor);
3603 if (major != MAJOR(dev) ||
3604 minor != MINOR(dev))
3608 if (mddev->persistent) {
3609 rdev = md_import_device(dev, mddev->major_version,
3610 mddev->minor_version);
3611 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
3612 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
3613 mdk_rdev_t, same_set);
3614 err = super_types[mddev->major_version]
3615 .load_super(rdev, rdev0, mddev->minor_version);
3619 } else if (mddev->external)
3620 rdev = md_import_device(dev, -2, -1);
3622 rdev = md_import_device(dev, -1, -1);
3625 return PTR_ERR(rdev);
3626 err = bind_rdev_to_array(rdev, mddev);
3630 return err ? err : len;
3633 static struct md_sysfs_entry md_new_device =
3634 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
3637 bitmap_store(mddev_t *mddev, const char *buf, size_t len)
3640 unsigned long chunk, end_chunk;
3644 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
3646 chunk = end_chunk = simple_strtoul(buf, &end, 0);
3647 if (buf == end) break;
3648 if (*end == '-') { /* range */
3650 end_chunk = simple_strtoul(buf, &end, 0);
3651 if (buf == end) break;
3653 if (*end && !isspace(*end)) break;
3654 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
3655 buf = skip_spaces(end);
3657 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
3662 static struct md_sysfs_entry md_bitmap =
3663 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
3666 size_show(mddev_t *mddev, char *page)
3668 return sprintf(page, "%llu\n",
3669 (unsigned long long)mddev->dev_sectors / 2);
3672 static int update_size(mddev_t *mddev, sector_t num_sectors);
3675 size_store(mddev_t *mddev, const char *buf, size_t len)
3677 /* If array is inactive, we can reduce the component size, but
3678 * not increase it (except from 0).
3679 * If array is active, we can try an on-line resize
3682 int err = strict_blocks_to_sectors(buf, §ors);
3687 err = update_size(mddev, sectors);
3688 md_update_sb(mddev, 1);
3690 if (mddev->dev_sectors == 0 ||
3691 mddev->dev_sectors > sectors)
3692 mddev->dev_sectors = sectors;
3696 return err ? err : len;
3699 static struct md_sysfs_entry md_size =
3700 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
3705 * 'none' for arrays with no metadata (good luck...)
3706 * 'external' for arrays with externally managed metadata,
3707 * or N.M for internally known formats
3710 metadata_show(mddev_t *mddev, char *page)
3712 if (mddev->persistent)
3713 return sprintf(page, "%d.%d\n",
3714 mddev->major_version, mddev->minor_version);
3715 else if (mddev->external)
3716 return sprintf(page, "external:%s\n", mddev->metadata_type);
3718 return sprintf(page, "none\n");
3722 metadata_store(mddev_t *mddev, const char *buf, size_t len)
3726 /* Changing the details of 'external' metadata is
3727 * always permitted. Otherwise there must be
3728 * no devices attached to the array.
3730 if (mddev->external && strncmp(buf, "external:", 9) == 0)
3732 else if (!list_empty(&mddev->disks))
3735 if (cmd_match(buf, "none")) {
3736 mddev->persistent = 0;
3737 mddev->external = 0;
3738 mddev->major_version = 0;
3739 mddev->minor_version = 90;
3742 if (strncmp(buf, "external:", 9) == 0) {
3743 size_t namelen = len-9;
3744 if (namelen >= sizeof(mddev->metadata_type))
3745 namelen = sizeof(mddev->metadata_type)-1;
3746 strncpy(mddev->metadata_type, buf+9, namelen);
3747 mddev->metadata_type[namelen] = 0;
3748 if (namelen && mddev->metadata_type[namelen-1] == '\n')
3749 mddev->metadata_type[--namelen] = 0;
3750 mddev->persistent = 0;
3751 mddev->external = 1;
3752 mddev->major_version = 0;
3753 mddev->minor_version = 90;
3756 major = simple_strtoul(buf, &e, 10);
3757 if (e==buf || *e != '.')
3760 minor = simple_strtoul(buf, &e, 10);
3761 if (e==buf || (*e && *e != '\n') )
3763 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
3765 mddev->major_version = major;
3766 mddev->minor_version = minor;
3767 mddev->persistent = 1;
3768 mddev->external = 0;
3772 static struct md_sysfs_entry md_metadata =
3773 __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
3776 action_show(mddev_t *mddev, char *page)
3778 char *type = "idle";
3779 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
3781 else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3782 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) {
3783 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
3785 else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
3786 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
3788 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
3792 } else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
3795 return sprintf(page, "%s\n", type);
3798 static void reap_sync_thread(mddev_t *mddev);
3801 action_store(mddev_t *mddev, const char *page, size_t len)
3803 if (!mddev->pers || !mddev->pers->sync_request)
3806 if (cmd_match(page, "frozen"))
3807 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3809 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3811 if (cmd_match(page, "idle") || cmd_match(page, "frozen")) {
3812 if (mddev->sync_thread) {
3813 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
3814 reap_sync_thread(mddev);
3816 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3817 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
3819 else if (cmd_match(page, "resync"))
3820 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3821 else if (cmd_match(page, "recover")) {
3822 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
3823 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3824 } else if (cmd_match(page, "reshape")) {
3826 if (mddev->pers->start_reshape == NULL)
3828 err = mddev->pers->start_reshape(mddev);
3831 sysfs_notify(&mddev->kobj, NULL, "degraded");
3833 if (cmd_match(page, "check"))
3834 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
3835 else if (!cmd_match(page, "repair"))
3837 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
3838 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
3840 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3841 md_wakeup_thread(mddev->thread);
3842 sysfs_notify_dirent_safe(mddev->sysfs_action);
3847 mismatch_cnt_show(mddev_t *mddev, char *page)
3849 return sprintf(page, "%llu\n",
3850 (unsigned long long) mddev->resync_mismatches);
3853 static struct md_sysfs_entry md_scan_mode =
3854 __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
3857 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
3860 sync_min_show(mddev_t *mddev, char *page)
3862 return sprintf(page, "%d (%s)\n", speed_min(mddev),
3863 mddev->sync_speed_min ? "local": "system");
3867 sync_min_store(mddev_t *mddev, const char *buf, size_t len)
3871 if (strncmp(buf, "system", 6)==0) {
3872 mddev->sync_speed_min = 0;
3875 min = simple_strtoul(buf, &e, 10);
3876 if (buf == e || (*e && *e != '\n') || min <= 0)
3878 mddev->sync_speed_min = min;
3882 static struct md_sysfs_entry md_sync_min =
3883 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
3886 sync_max_show(mddev_t *mddev, char *page)
3888 return sprintf(page, "%d (%s)\n", speed_max(mddev),
3889 mddev->sync_speed_max ? "local": "system");
3893 sync_max_store(mddev_t *mddev, const char *buf, size_t len)
3897 if (strncmp(buf, "system", 6)==0) {
3898 mddev->sync_speed_max = 0;
3901 max = simple_strtoul(buf, &e, 10);
3902 if (buf == e || (*e && *e != '\n') || max <= 0)
3904 mddev->sync_speed_max = max;
3908 static struct md_sysfs_entry md_sync_max =
3909 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
3912 degraded_show(mddev_t *mddev, char *page)
3914 return sprintf(page, "%d\n", mddev->degraded);
3916 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
3919 sync_force_parallel_show(mddev_t *mddev, char *page)
3921 return sprintf(page, "%d\n", mddev->parallel_resync);
3925 sync_force_parallel_store(mddev_t *mddev, const char *buf, size_t len)
3929 if (strict_strtol(buf, 10, &n))
3932 if (n != 0 && n != 1)
3935 mddev->parallel_resync = n;
3937 if (mddev->sync_thread)
3938 wake_up(&resync_wait);
3943 /* force parallel resync, even with shared block devices */
3944 static struct md_sysfs_entry md_sync_force_parallel =
3945 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
3946 sync_force_parallel_show, sync_force_parallel_store);
3949 sync_speed_show(mddev_t *mddev, char *page)
3951 unsigned long resync, dt, db;
3952 if (mddev->curr_resync == 0)
3953 return sprintf(page, "none\n");
3954 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
3955 dt = (jiffies - mddev->resync_mark) / HZ;
3957 db = resync - mddev->resync_mark_cnt;
3958 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
3961 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
3964 sync_completed_show(mddev_t *mddev, char *page)
3966 unsigned long long max_sectors, resync;
3968 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3969 return sprintf(page, "none\n");
3971 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
3972 max_sectors = mddev->resync_max_sectors;
3974 max_sectors = mddev->dev_sectors;
3976 resync = mddev->curr_resync_completed;
3977 return sprintf(page, "%llu / %llu\n", resync, max_sectors);
3980 static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed);
3983 min_sync_show(mddev_t *mddev, char *page)
3985 return sprintf(page, "%llu\n",
3986 (unsigned long long)mddev->resync_min);
3989 min_sync_store(mddev_t *mddev, const char *buf, size_t len)
3991 unsigned long long min;
3992 if (strict_strtoull(buf, 10, &min))
3994 if (min > mddev->resync_max)
3996 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3999 /* Must be a multiple of chunk_size */
4000 if (mddev->chunk_sectors) {
4001 sector_t temp = min;
4002 if (sector_div(temp, mddev->chunk_sectors))
4005 mddev->resync_min = min;
4010 static struct md_sysfs_entry md_min_sync =
4011 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
4014 max_sync_show(mddev_t *mddev, char *page)
4016 if (mddev->resync_max == MaxSector)
4017 return sprintf(page, "max\n");
4019 return sprintf(page, "%llu\n",
4020 (unsigned long long)mddev->resync_max);
4023 max_sync_store(mddev_t *mddev, const char *buf, size_t len)
4025 if (strncmp(buf, "max", 3) == 0)
4026 mddev->resync_max = MaxSector;
4028 unsigned long long max;
4029 if (strict_strtoull(buf, 10, &max))
4031 if (max < mddev->resync_min)
4033 if (max < mddev->resync_max &&
4035 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4038 /* Must be a multiple of chunk_size */
4039 if (mddev->chunk_sectors) {
4040 sector_t temp = max;
4041 if (sector_div(temp, mddev->chunk_sectors))
4044 mddev->resync_max = max;
4046 wake_up(&mddev->recovery_wait);
4050 static struct md_sysfs_entry md_max_sync =
4051 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
4054 suspend_lo_show(mddev_t *mddev, char *page)
4056 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
4060 suspend_lo_store(mddev_t *mddev, const char *buf, size_t len)
4063 unsigned long long new = simple_strtoull(buf, &e, 10);
4064 unsigned long long old = mddev->suspend_lo;
4066 if (mddev->pers == NULL ||
4067 mddev->pers->quiesce == NULL)
4069 if (buf == e || (*e && *e != '\n'))
4072 mddev->suspend_lo = new;
4074 /* Shrinking suspended region */
4075 mddev->pers->quiesce(mddev, 2);
4077 /* Expanding suspended region - need to wait */
4078 mddev->pers->quiesce(mddev, 1);
4079 mddev->pers->quiesce(mddev, 0);
4083 static struct md_sysfs_entry md_suspend_lo =
4084 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
4088 suspend_hi_show(mddev_t *mddev, char *page)
4090 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
4094 suspend_hi_store(mddev_t *mddev, const char *buf, size_t len)
4097 unsigned long long new = simple_strtoull(buf, &e, 10);
4098 unsigned long long old = mddev->suspend_hi;
4100 if (mddev->pers == NULL ||
4101 mddev->pers->quiesce == NULL)
4103 if (buf == e || (*e && *e != '\n'))
4106 mddev->suspend_hi = new;
4108 /* Shrinking suspended region */
4109 mddev->pers->quiesce(mddev, 2);
4111 /* Expanding suspended region - need to wait */
4112 mddev->pers->quiesce(mddev, 1);
4113 mddev->pers->quiesce(mddev, 0);
4117 static struct md_sysfs_entry md_suspend_hi =
4118 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
4121 reshape_position_show(mddev_t *mddev, char *page)
4123 if (mddev->reshape_position != MaxSector)
4124 return sprintf(page, "%llu\n",
4125 (unsigned long long)mddev->reshape_position);
4126 strcpy(page, "none\n");
4131 reshape_position_store(mddev_t *mddev, const char *buf, size_t len)
4134 unsigned long long new = simple_strtoull(buf, &e, 10);
4137 if (buf == e || (*e && *e != '\n'))
4139 mddev->reshape_position = new;
4140 mddev->delta_disks = 0;
4141 mddev->new_level = mddev->level;
4142 mddev->new_layout = mddev->layout;
4143 mddev->new_chunk_sectors = mddev->chunk_sectors;
4147 static struct md_sysfs_entry md_reshape_position =
4148 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
4149 reshape_position_store);
4152 array_size_show(mddev_t *mddev, char *page)
4154 if (mddev->external_size)
4155 return sprintf(page, "%llu\n",
4156 (unsigned long long)mddev->array_sectors/2);
4158 return sprintf(page, "default\n");
4162 array_size_store(mddev_t *mddev, const char *buf, size_t len)
4166 if (strncmp(buf, "default", 7) == 0) {
4168 sectors = mddev->pers->size(mddev, 0, 0);
4170 sectors = mddev->array_sectors;
4172 mddev->external_size = 0;
4174 if (strict_blocks_to_sectors(buf, §ors) < 0)
4176 if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors)
4179 mddev->external_size = 1;
4182 mddev->array_sectors = sectors;
4184 set_capacity(mddev->gendisk, mddev->array_sectors);
4185 revalidate_disk(mddev->gendisk);
4190 static struct md_sysfs_entry md_array_size =
4191 __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show,
4194 static struct attribute *md_default_attrs[] = {
4197 &md_raid_disks.attr,
4198 &md_chunk_size.attr,
4200 &md_resync_start.attr,
4202 &md_new_device.attr,
4203 &md_safe_delay.attr,
4204 &md_array_state.attr,
4205 &md_reshape_position.attr,
4206 &md_array_size.attr,
4207 &max_corr_read_errors.attr,
4211 static struct attribute *md_redundancy_attrs[] = {
4213 &md_mismatches.attr,
4216 &md_sync_speed.attr,
4217 &md_sync_force_parallel.attr,
4218 &md_sync_completed.attr,
4221 &md_suspend_lo.attr,
4222 &md_suspend_hi.attr,
4227 static struct attribute_group md_redundancy_group = {
4229 .attrs = md_redundancy_attrs,
4234 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
4236 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
4237 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
4242 rv = mddev_lock(mddev);
4244 rv = entry->show(mddev, page);
4245 mddev_unlock(mddev);
4251 md_attr_store(struct kobject *kobj, struct attribute *attr,
4252 const char *page, size_t length)
4254 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
4255 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
4260 if (!capable(CAP_SYS_ADMIN))
4262 rv = mddev_lock(mddev);
4263 if (mddev->hold_active == UNTIL_IOCTL)
4264 mddev->hold_active = 0;
4266 rv = entry->store(mddev, page, length);
4267 mddev_unlock(mddev);
4272 static void md_free(struct kobject *ko)
4274 mddev_t *mddev = container_of(ko, mddev_t, kobj);
4276 if (mddev->sysfs_state)
4277 sysfs_put(mddev->sysfs_state);
4279 if (mddev->gendisk) {
4280 del_gendisk(mddev->gendisk);
4281 put_disk(mddev->gendisk);
4284 blk_cleanup_queue(mddev->queue);
4289 static const struct sysfs_ops md_sysfs_ops = {
4290 .show = md_attr_show,
4291 .store = md_attr_store,
4293 static struct kobj_type md_ktype = {
4295 .sysfs_ops = &md_sysfs_ops,
4296 .default_attrs = md_default_attrs,
4301 static void mddev_delayed_delete(struct work_struct *ws)
4303 mddev_t *mddev = container_of(ws, mddev_t, del_work);
4305 sysfs_remove_group(&mddev->kobj, &md_bitmap_group);
4306 kobject_del(&mddev->kobj);
4307 kobject_put(&mddev->kobj);
4310 static int md_alloc(dev_t dev, char *name)
4312 static DEFINE_MUTEX(disks_mutex);
4313 mddev_t *mddev = mddev_find(dev);
4314 struct gendisk *disk;
4323 partitioned = (MAJOR(mddev->unit) != MD_MAJOR);
4324 shift = partitioned ? MdpMinorShift : 0;
4325 unit = MINOR(mddev->unit) >> shift;
4327 /* wait for any previous instance of this device to be
4328 * completely removed (mddev_delayed_delete).
4330 flush_workqueue(md_misc_wq);
4332 mutex_lock(&disks_mutex);
4338 /* Need to ensure that 'name' is not a duplicate.
4341 spin_lock(&all_mddevs_lock);
4343 list_for_each_entry(mddev2, &all_mddevs, all_mddevs)
4344 if (mddev2->gendisk &&
4345 strcmp(mddev2->gendisk->disk_name, name) == 0) {
4346 spin_unlock(&all_mddevs_lock);
4349 spin_unlock(&all_mddevs_lock);
4353 mddev->queue = blk_alloc_queue(GFP_KERNEL);
4356 mddev->queue->queuedata = mddev;
4358 blk_queue_make_request(mddev->queue, md_make_request);
4360 disk = alloc_disk(1 << shift);
4362 blk_cleanup_queue(mddev->queue);
4363 mddev->queue = NULL;
4366 disk->major = MAJOR(mddev->unit);
4367 disk->first_minor = unit << shift;
4369 strcpy(disk->disk_name, name);
4370 else if (partitioned)
4371 sprintf(disk->disk_name, "md_d%d", unit);
4373 sprintf(disk->disk_name, "md%d", unit);
4374 disk->fops = &md_fops;
4375 disk->private_data = mddev;
4376 disk->queue = mddev->queue;
4377 blk_queue_flush(mddev->queue, REQ_FLUSH | REQ_FUA);
4378 /* Allow extended partitions. This makes the
4379 * 'mdp' device redundant, but we can't really
4382 disk->flags |= GENHD_FL_EXT_DEVT;
4383 mddev->gendisk = disk;
4384 /* As soon as we call add_disk(), another thread could get
4385 * through to md_open, so make sure it doesn't get too far
4387 mutex_lock(&mddev->open_mutex);
4390 error = kobject_init_and_add(&mddev->kobj, &md_ktype,
4391 &disk_to_dev(disk)->kobj, "%s", "md");
4393 /* This isn't possible, but as kobject_init_and_add is marked
4394 * __must_check, we must do something with the result
4396 printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
4400 if (mddev->kobj.sd &&
4401 sysfs_create_group(&mddev->kobj, &md_bitmap_group))
4402 printk(KERN_DEBUG "pointless warning\n");
4403 mutex_unlock(&mddev->open_mutex);
4405 mutex_unlock(&disks_mutex);
4406 if (!error && mddev->kobj.sd) {
4407 kobject_uevent(&mddev->kobj, KOBJ_ADD);
4408 mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state");
4414 static struct kobject *md_probe(dev_t dev, int *part, void *data)
4416 md_alloc(dev, NULL);
4420 static int add_named_array(const char *val, struct kernel_param *kp)
4422 /* val must be "md_*" where * is not all digits.
4423 * We allocate an array with a large free minor number, and
4424 * set the name to val. val must not already be an active name.
4426 int len = strlen(val);
4427 char buf[DISK_NAME_LEN];
4429 while (len && val[len-1] == '\n')
4431 if (len >= DISK_NAME_LEN)
4433 strlcpy(buf, val, len+1);
4434 if (strncmp(buf, "md_", 3) != 0)
4436 return md_alloc(0, buf);
4439 static void md_safemode_timeout(unsigned long data)
4441 mddev_t *mddev = (mddev_t *) data;
4443 if (!atomic_read(&mddev->writes_pending)) {
4444 mddev->safemode = 1;
4445 if (mddev->external)
4446 sysfs_notify_dirent_safe(mddev->sysfs_state);
4448 md_wakeup_thread(mddev->thread);
4451 static int start_dirty_degraded;
4453 int md_run(mddev_t *mddev)
4457 struct mdk_personality *pers;
4459 if (list_empty(&mddev->disks))
4460 /* cannot run an array with no devices.. */
4465 /* Cannot run until previous stop completes properly */
4466 if (mddev->sysfs_active)
4470 * Analyze all RAID superblock(s)
4472 if (!mddev->raid_disks) {
4473 if (!mddev->persistent)
4478 if (mddev->level != LEVEL_NONE)
4479 request_module("md-level-%d", mddev->level);
4480 else if (mddev->clevel[0])
4481 request_module("md-%s", mddev->clevel);
4484 * Drop all container device buffers, from now on
4485 * the only valid external interface is through the md
4488 list_for_each_entry(rdev, &mddev->disks, same_set) {
4489 if (test_bit(Faulty, &rdev->flags))
4491 sync_blockdev(rdev->bdev);
4492 invalidate_bdev(rdev->bdev);
4494 /* perform some consistency tests on the device.
4495 * We don't want the data to overlap the metadata,
4496 * Internal Bitmap issues have been handled elsewhere.
4498 if (rdev->meta_bdev) {
4499 /* Nothing to check */;
4500 } else if (rdev->data_offset < rdev->sb_start) {
4501 if (mddev->dev_sectors &&
4502 rdev->data_offset + mddev->dev_sectors
4504 printk("md: %s: data overlaps metadata\n",
4509 if (rdev->sb_start + rdev->sb_size/512
4510 > rdev->data_offset) {
4511 printk("md: %s: metadata overlaps data\n",
4516 sysfs_notify_dirent_safe(rdev->sysfs_state);
4519 if (mddev->bio_set == NULL)
4520 mddev->bio_set = bioset_create(BIO_POOL_SIZE,
4523 spin_lock(&pers_lock);
4524 pers = find_pers(mddev->level, mddev->clevel);
4525 if (!pers || !try_module_get(pers->owner)) {
4526 spin_unlock(&pers_lock);
4527 if (mddev->level != LEVEL_NONE)
4528 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
4531 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
4536 spin_unlock(&pers_lock);
4537 if (mddev->level != pers->level) {
4538 mddev->level = pers->level;
4539 mddev->new_level = pers->level;
4541 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
4543 if (mddev->reshape_position != MaxSector &&
4544 pers->start_reshape == NULL) {
4545 /* This personality cannot handle reshaping... */
4547 module_put(pers->owner);
4551 if (pers->sync_request) {
4552 /* Warn if this is a potentially silly
4555 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
4559 list_for_each_entry(rdev, &mddev->disks, same_set)
4560 list_for_each_entry(rdev2, &mddev->disks, same_set) {
4562 rdev->bdev->bd_contains ==
4563 rdev2->bdev->bd_contains) {
4565 "%s: WARNING: %s appears to be"
4566 " on the same physical disk as"
4569 bdevname(rdev->bdev,b),
4570 bdevname(rdev2->bdev,b2));
4577 "True protection against single-disk"
4578 " failure might be compromised.\n");
4581 mddev->recovery = 0;
4582 /* may be over-ridden by personality */
4583 mddev->resync_max_sectors = mddev->dev_sectors;
4585 mddev->ok_start_degraded = start_dirty_degraded;
4587 if (start_readonly && mddev->ro == 0)
4588 mddev->ro = 2; /* read-only, but switch on first write */
4590 err = mddev->pers->run(mddev);
4592 printk(KERN_ERR "md: pers->run() failed ...\n");
4593 else if (mddev->pers->size(mddev, 0, 0) < mddev->array_sectors) {
4594 WARN_ONCE(!mddev->external_size, "%s: default size too small,"
4595 " but 'external_size' not in effect?\n", __func__);
4597 "md: invalid array_size %llu > default size %llu\n",
4598 (unsigned long long)mddev->array_sectors / 2,
4599 (unsigned long long)mddev->pers->size(mddev, 0, 0) / 2);
4601 mddev->pers->stop(mddev);
4603 if (err == 0 && mddev->pers->sync_request) {
4604 err = bitmap_create(mddev);
4606 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
4607 mdname(mddev), err);
4608 mddev->pers->stop(mddev);
4612 module_put(mddev->pers->owner);
4614 bitmap_destroy(mddev);
4617 if (mddev->pers->sync_request) {
4618 if (mddev->kobj.sd &&
4619 sysfs_create_group(&mddev->kobj, &md_redundancy_group))
4621 "md: cannot register extra attributes for %s\n",
4623 mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action");
4624 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
4627 atomic_set(&mddev->writes_pending,0);
4628 atomic_set(&mddev->max_corr_read_errors,
4629 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS);
4630 mddev->safemode = 0;
4631 mddev->safemode_timer.function = md_safemode_timeout;
4632 mddev->safemode_timer.data = (unsigned long) mddev;
4633 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
4637 list_for_each_entry(rdev, &mddev->disks, same_set)
4638 if (rdev->raid_disk >= 0)
4639 if (sysfs_link_rdev(mddev, rdev))
4640 /* failure here is OK */;
4642 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4645 md_update_sb(mddev, 0);
4647 md_new_event(mddev);
4648 sysfs_notify_dirent_safe(mddev->sysfs_state);
4649 sysfs_notify_dirent_safe(mddev->sysfs_action);
4650 sysfs_notify(&mddev->kobj, NULL, "degraded");
4653 EXPORT_SYMBOL_GPL(md_run);
4655 static int do_md_run(mddev_t *mddev)
4659 err = md_run(mddev);
4662 err = bitmap_load(mddev);
4664 bitmap_destroy(mddev);
4668 md_wakeup_thread(mddev->thread);
4669 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
4671 set_capacity(mddev->gendisk, mddev->array_sectors);
4672 revalidate_disk(mddev->gendisk);
4674 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
4679 static int restart_array(mddev_t *mddev)
4681 struct gendisk *disk = mddev->gendisk;
4683 /* Complain if it has no devices */
4684 if (list_empty(&mddev->disks))
4690 mddev->safemode = 0;
4692 set_disk_ro(disk, 0);
4693 printk(KERN_INFO "md: %s switched to read-write mode.\n",
4695 /* Kick recovery or resync if necessary */
4696 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4697 md_wakeup_thread(mddev->thread);
4698 md_wakeup_thread(mddev->sync_thread);
4699 sysfs_notify_dirent_safe(mddev->sysfs_state);
4703 /* similar to deny_write_access, but accounts for our holding a reference
4704 * to the file ourselves */
4705 static int deny_bitmap_write_access(struct file * file)
4707 struct inode *inode = file->f_mapping->host;
4709 spin_lock(&inode->i_lock);
4710 if (atomic_read(&inode->i_writecount) > 1) {
4711 spin_unlock(&inode->i_lock);
4714 atomic_set(&inode->i_writecount, -1);
4715 spin_unlock(&inode->i_lock);
4720 void restore_bitmap_write_access(struct file *file)
4722 struct inode *inode = file->f_mapping->host;
4724 spin_lock(&inode->i_lock);
4725 atomic_set(&inode->i_writecount, 1);
4726 spin_unlock(&inode->i_lock);
4729 static void md_clean(mddev_t *mddev)
4731 mddev->array_sectors = 0;
4732 mddev->external_size = 0;
4733 mddev->dev_sectors = 0;
4734 mddev->raid_disks = 0;
4735 mddev->recovery_cp = 0;
4736 mddev->resync_min = 0;
4737 mddev->resync_max = MaxSector;
4738 mddev->reshape_position = MaxSector;
4739 mddev->external = 0;
4740 mddev->persistent = 0;
4741 mddev->level = LEVEL_NONE;
4742 mddev->clevel[0] = 0;
4745 mddev->metadata_type[0] = 0;
4746 mddev->chunk_sectors = 0;
4747 mddev->ctime = mddev->utime = 0;
4749 mddev->max_disks = 0;
4751 mddev->can_decrease_events = 0;
4752 mddev->delta_disks = 0;
4753 mddev->new_level = LEVEL_NONE;
4754 mddev->new_layout = 0;
4755 mddev->new_chunk_sectors = 0;
4756 mddev->curr_resync = 0;
4757 mddev->resync_mismatches = 0;
4758 mddev->suspend_lo = mddev->suspend_hi = 0;
4759 mddev->sync_speed_min = mddev->sync_speed_max = 0;
4760 mddev->recovery = 0;
4763 mddev->degraded = 0;
4764 mddev->safemode = 0;
4765 mddev->bitmap_info.offset = 0;
4766 mddev->bitmap_info.default_offset = 0;
4767 mddev->bitmap_info.chunksize = 0;
4768 mddev->bitmap_info.daemon_sleep = 0;
4769 mddev->bitmap_info.max_write_behind = 0;
4772 static void __md_stop_writes(mddev_t *mddev)
4774 if (mddev->sync_thread) {
4775 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4776 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4777 reap_sync_thread(mddev);
4780 del_timer_sync(&mddev->safemode_timer);
4782 bitmap_flush(mddev);
4783 md_super_wait(mddev);
4785 if (!mddev->in_sync || mddev->flags) {
4786 /* mark array as shutdown cleanly */
4788 md_update_sb(mddev, 1);
4792 void md_stop_writes(mddev_t *mddev)
4795 __md_stop_writes(mddev);
4796 mddev_unlock(mddev);
4798 EXPORT_SYMBOL_GPL(md_stop_writes);
4800 void md_stop(mddev_t *mddev)
4803 mddev->pers->stop(mddev);
4804 if (mddev->pers->sync_request && mddev->to_remove == NULL)
4805 mddev->to_remove = &md_redundancy_group;
4806 module_put(mddev->pers->owner);
4808 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4810 EXPORT_SYMBOL_GPL(md_stop);
4812 static int md_set_readonly(mddev_t *mddev, int is_open)
4815 mutex_lock(&mddev->open_mutex);
4816 if (atomic_read(&mddev->openers) > is_open) {
4817 printk("md: %s still in use.\n",mdname(mddev));
4822 __md_stop_writes(mddev);
4828 set_disk_ro(mddev->gendisk, 1);
4829 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4830 sysfs_notify_dirent_safe(mddev->sysfs_state);
4834 mutex_unlock(&mddev->open_mutex);
4839 * 0 - completely stop and dis-assemble array
4840 * 2 - stop but do not disassemble array
4842 static int do_md_stop(mddev_t * mddev, int mode, int is_open)
4844 struct gendisk *disk = mddev->gendisk;
4847 mutex_lock(&mddev->open_mutex);
4848 if (atomic_read(&mddev->openers) > is_open ||
4849 mddev->sysfs_active) {
4850 printk("md: %s still in use.\n",mdname(mddev));
4851 mutex_unlock(&mddev->open_mutex);
4857 set_disk_ro(disk, 0);
4859 __md_stop_writes(mddev);
4861 mddev->queue->merge_bvec_fn = NULL;
4862 mddev->queue->backing_dev_info.congested_fn = NULL;
4864 /* tell userspace to handle 'inactive' */
4865 sysfs_notify_dirent_safe(mddev->sysfs_state);
4867 list_for_each_entry(rdev, &mddev->disks, same_set)
4868 if (rdev->raid_disk >= 0)
4869 sysfs_unlink_rdev(mddev, rdev);
4871 set_capacity(disk, 0);
4872 mutex_unlock(&mddev->open_mutex);
4874 revalidate_disk(disk);
4879 mutex_unlock(&mddev->open_mutex);
4881 * Free resources if final stop
4884 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
4886 bitmap_destroy(mddev);
4887 if (mddev->bitmap_info.file) {
4888 restore_bitmap_write_access(mddev->bitmap_info.file);
4889 fput(mddev->bitmap_info.file);
4890 mddev->bitmap_info.file = NULL;
4892 mddev->bitmap_info.offset = 0;
4894 export_array(mddev);
4897 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
4898 if (mddev->hold_active == UNTIL_STOP)
4899 mddev->hold_active = 0;
4901 blk_integrity_unregister(disk);
4902 md_new_event(mddev);
4903 sysfs_notify_dirent_safe(mddev->sysfs_state);
4908 static void autorun_array(mddev_t *mddev)
4913 if (list_empty(&mddev->disks))
4916 printk(KERN_INFO "md: running: ");
4918 list_for_each_entry(rdev, &mddev->disks, same_set) {
4919 char b[BDEVNAME_SIZE];
4920 printk("<%s>", bdevname(rdev->bdev,b));
4924 err = do_md_run(mddev);
4926 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
4927 do_md_stop(mddev, 0, 0);
4932 * lets try to run arrays based on all disks that have arrived
4933 * until now. (those are in pending_raid_disks)
4935 * the method: pick the first pending disk, collect all disks with
4936 * the same UUID, remove all from the pending list and put them into
4937 * the 'same_array' list. Then order this list based on superblock
4938 * update time (freshest comes first), kick out 'old' disks and
4939 * compare superblocks. If everything's fine then run it.
4941 * If "unit" is allocated, then bump its reference count
4943 static void autorun_devices(int part)
4945 mdk_rdev_t *rdev0, *rdev, *tmp;
4947 char b[BDEVNAME_SIZE];
4949 printk(KERN_INFO "md: autorun ...\n");
4950 while (!list_empty(&pending_raid_disks)) {
4953 LIST_HEAD(candidates);
4954 rdev0 = list_entry(pending_raid_disks.next,
4955 mdk_rdev_t, same_set);
4957 printk(KERN_INFO "md: considering %s ...\n",
4958 bdevname(rdev0->bdev,b));
4959 INIT_LIST_HEAD(&candidates);
4960 rdev_for_each_list(rdev, tmp, &pending_raid_disks)
4961 if (super_90_load(rdev, rdev0, 0) >= 0) {
4962 printk(KERN_INFO "md: adding %s ...\n",
4963 bdevname(rdev->bdev,b));
4964 list_move(&rdev->same_set, &candidates);
4967 * now we have a set of devices, with all of them having
4968 * mostly sane superblocks. It's time to allocate the
4972 dev = MKDEV(mdp_major,
4973 rdev0->preferred_minor << MdpMinorShift);
4974 unit = MINOR(dev) >> MdpMinorShift;
4976 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
4979 if (rdev0->preferred_minor != unit) {
4980 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
4981 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
4985 md_probe(dev, NULL, NULL);
4986 mddev = mddev_find(dev);
4987 if (!mddev || !mddev->gendisk) {
4991 "md: cannot allocate memory for md drive.\n");
4994 if (mddev_lock(mddev))
4995 printk(KERN_WARNING "md: %s locked, cannot run\n",
4997 else if (mddev->raid_disks || mddev->major_version
4998 || !list_empty(&mddev->disks)) {
5000 "md: %s already running, cannot run %s\n",
5001 mdname(mddev), bdevname(rdev0->bdev,b));
5002 mddev_unlock(mddev);
5004 printk(KERN_INFO "md: created %s\n", mdname(mddev));
5005 mddev->persistent = 1;
5006 rdev_for_each_list(rdev, tmp, &candidates) {
5007 list_del_init(&rdev->same_set);
5008 if (bind_rdev_to_array(rdev, mddev))
5011 autorun_array(mddev);
5012 mddev_unlock(mddev);
5014 /* on success, candidates will be empty, on error
5017 rdev_for_each_list(rdev, tmp, &candidates) {
5018 list_del_init(&rdev->same_set);
5023 printk(KERN_INFO "md: ... autorun DONE.\n");
5025 #endif /* !MODULE */
5027 static int get_version(void __user * arg)
5031 ver.major = MD_MAJOR_VERSION;
5032 ver.minor = MD_MINOR_VERSION;
5033 ver.patchlevel = MD_PATCHLEVEL_VERSION;
5035 if (copy_to_user(arg, &ver, sizeof(ver)))
5041 static int get_array_info(mddev_t * mddev, void __user * arg)
5043 mdu_array_info_t info;
5044 int nr,working,insync,failed,spare;
5047 nr=working=insync=failed=spare=0;
5048 list_for_each_entry(rdev, &mddev->disks, same_set) {
5050 if (test_bit(Faulty, &rdev->flags))
5054 if (test_bit(In_sync, &rdev->flags))
5061 info.major_version = mddev->major_version;
5062 info.minor_version = mddev->minor_version;
5063 info.patch_version = MD_PATCHLEVEL_VERSION;
5064 info.ctime = mddev->ctime;
5065 info.level = mddev->level;
5066 info.size = mddev->dev_sectors / 2;
5067 if (info.size != mddev->dev_sectors / 2) /* overflow */
5070 info.raid_disks = mddev->raid_disks;
5071 info.md_minor = mddev->md_minor;
5072 info.not_persistent= !mddev->persistent;
5074 info.utime = mddev->utime;
5077 info.state = (1<<MD_SB_CLEAN);
5078 if (mddev->bitmap && mddev->bitmap_info.offset)
5079 info.state = (1<<MD_SB_BITMAP_PRESENT);
5080 info.active_disks = insync;
5081 info.working_disks = working;
5082 info.failed_disks = failed;
5083 info.spare_disks = spare;
5085 info.layout = mddev->layout;
5086 info.chunk_size = mddev->chunk_sectors << 9;
5088 if (copy_to_user(arg, &info, sizeof(info)))
5094 static int get_bitmap_file(mddev_t * mddev, void __user * arg)
5096 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
5097 char *ptr, *buf = NULL;
5100 if (md_allow_write(mddev))
5101 file = kmalloc(sizeof(*file), GFP_NOIO);
5103 file = kmalloc(sizeof(*file), GFP_KERNEL);
5108 /* bitmap disabled, zero the first byte and copy out */
5109 if (!mddev->bitmap || !mddev->bitmap->file) {
5110 file->pathname[0] = '\0';
5114 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
5118 ptr = d_path(&mddev->bitmap->file->f_path, buf, sizeof(file->pathname));
5122 strcpy(file->pathname, ptr);
5126 if (copy_to_user(arg, file, sizeof(*file)))
5134 static int get_disk_info(mddev_t * mddev, void __user * arg)
5136 mdu_disk_info_t info;
5139 if (copy_from_user(&info, arg, sizeof(info)))
5142 rdev = find_rdev_nr(mddev, info.number);
5144 info.major = MAJOR(rdev->bdev->bd_dev);
5145 info.minor = MINOR(rdev->bdev->bd_dev);
5146 info.raid_disk = rdev->raid_disk;
5148 if (test_bit(Faulty, &rdev->flags))
5149 info.state |= (1<<MD_DISK_FAULTY);
5150 else if (test_bit(In_sync, &rdev->flags)) {
5151 info.state |= (1<<MD_DISK_ACTIVE);
5152 info.state |= (1<<MD_DISK_SYNC);
5154 if (test_bit(WriteMostly, &rdev->flags))
5155 info.state |= (1<<MD_DISK_WRITEMOSTLY);
5157 info.major = info.minor = 0;
5158 info.raid_disk = -1;
5159 info.state = (1<<MD_DISK_REMOVED);
5162 if (copy_to_user(arg, &info, sizeof(info)))
5168 static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
5170 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
5172 dev_t dev = MKDEV(info->major,info->minor);
5174 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
5177 if (!mddev->raid_disks) {
5179 /* expecting a device which has a superblock */
5180 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
5183 "md: md_import_device returned %ld\n",
5185 return PTR_ERR(rdev);
5187 if (!list_empty(&mddev->disks)) {
5188 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
5189 mdk_rdev_t, same_set);
5190 err = super_types[mddev->major_version]
5191 .load_super(rdev, rdev0, mddev->minor_version);
5194 "md: %s has different UUID to %s\n",
5195 bdevname(rdev->bdev,b),
5196 bdevname(rdev0->bdev,b2));
5201 err = bind_rdev_to_array(rdev, mddev);
5208 * add_new_disk can be used once the array is assembled
5209 * to add "hot spares". They must already have a superblock
5214 if (!mddev->pers->hot_add_disk) {
5216 "%s: personality does not support diskops!\n",
5220 if (mddev->persistent)
5221 rdev = md_import_device(dev, mddev->major_version,
5222 mddev->minor_version);
5224 rdev = md_import_device(dev, -1, -1);
5227 "md: md_import_device returned %ld\n",
5229 return PTR_ERR(rdev);
5231 /* set saved_raid_disk if appropriate */
5232 if (!mddev->persistent) {
5233 if (info->state & (1<<MD_DISK_SYNC) &&
5234 info->raid_disk < mddev->raid_disks) {
5235 rdev->raid_disk = info->raid_disk;
5236 set_bit(In_sync, &rdev->flags);
5238 rdev->raid_disk = -1;
5240 super_types[mddev->major_version].
5241 validate_super(mddev, rdev);
5242 if ((info->state & (1<<MD_DISK_SYNC)) &&
5243 (!test_bit(In_sync, &rdev->flags) ||
5244 rdev->raid_disk != info->raid_disk)) {
5245 /* This was a hot-add request, but events doesn't
5246 * match, so reject it.
5252 if (test_bit(In_sync, &rdev->flags))
5253 rdev->saved_raid_disk = rdev->raid_disk;
5255 rdev->saved_raid_disk = -1;
5257 clear_bit(In_sync, &rdev->flags); /* just to be sure */
5258 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
5259 set_bit(WriteMostly, &rdev->flags);
5261 clear_bit(WriteMostly, &rdev->flags);
5263 rdev->raid_disk = -1;
5264 err = bind_rdev_to_array(rdev, mddev);
5265 if (!err && !mddev->pers->hot_remove_disk) {
5266 /* If there is hot_add_disk but no hot_remove_disk
5267 * then added disks for geometry changes,
5268 * and should be added immediately.
5270 super_types[mddev->major_version].
5271 validate_super(mddev, rdev);
5272 err = mddev->pers->hot_add_disk(mddev, rdev);
5274 unbind_rdev_from_array(rdev);
5279 sysfs_notify_dirent_safe(rdev->sysfs_state);
5281 md_update_sb(mddev, 1);
5282 if (mddev->degraded)
5283 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
5284 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5286 md_new_event(mddev);
5287 md_wakeup_thread(mddev->thread);
5291 /* otherwise, add_new_disk is only allowed
5292 * for major_version==0 superblocks
5294 if (mddev->major_version != 0) {
5295 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
5300 if (!(info->state & (1<<MD_DISK_FAULTY))) {
5302 rdev = md_import_device(dev, -1, 0);
5305 "md: error, md_import_device() returned %ld\n",
5307 return PTR_ERR(rdev);
5309 rdev->desc_nr = info->number;
5310 if (info->raid_disk < mddev->raid_disks)
5311 rdev->raid_disk = info->raid_disk;
5313 rdev->raid_disk = -1;
5315 if (rdev->raid_disk < mddev->raid_disks)
5316 if (info->state & (1<<MD_DISK_SYNC))
5317 set_bit(In_sync, &rdev->flags);
5319 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
5320 set_bit(WriteMostly, &rdev->flags);
5322 if (!mddev->persistent) {
5323 printk(KERN_INFO "md: nonpersistent superblock ...\n");
5324 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
5326 rdev->sb_start = calc_dev_sboffset(rdev);
5327 rdev->sectors = rdev->sb_start;
5329 err = bind_rdev_to_array(rdev, mddev);
5339 static int hot_remove_disk(mddev_t * mddev, dev_t dev)
5341 char b[BDEVNAME_SIZE];
5344 rdev = find_rdev(mddev, dev);
5348 if (rdev->raid_disk >= 0)
5351 kick_rdev_from_array(rdev);
5352 md_update_sb(mddev, 1);
5353 md_new_event(mddev);
5357 printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n",
5358 bdevname(rdev->bdev,b), mdname(mddev));
5362 static int hot_add_disk(mddev_t * mddev, dev_t dev)
5364 char b[BDEVNAME_SIZE];
5371 if (mddev->major_version != 0) {
5372 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
5373 " version-0 superblocks.\n",
5377 if (!mddev->pers->hot_add_disk) {
5379 "%s: personality does not support diskops!\n",
5384 rdev = md_import_device(dev, -1, 0);
5387 "md: error, md_import_device() returned %ld\n",
5392 if (mddev->persistent)
5393 rdev->sb_start = calc_dev_sboffset(rdev);
5395 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
5397 rdev->sectors = rdev->sb_start;
5399 if (test_bit(Faulty, &rdev->flags)) {
5401 "md: can not hot-add faulty %s disk to %s!\n",
5402 bdevname(rdev->bdev,b), mdname(mddev));
5406 clear_bit(In_sync, &rdev->flags);
5408 rdev->saved_raid_disk = -1;
5409 err = bind_rdev_to_array(rdev, mddev);
5414 * The rest should better be atomic, we can have disk failures
5415 * noticed in interrupt contexts ...
5418 rdev->raid_disk = -1;
5420 md_update_sb(mddev, 1);
5423 * Kick recovery, maybe this spare has to be added to the
5424 * array immediately.
5426 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5427 md_wakeup_thread(mddev->thread);
5428 md_new_event(mddev);
5436 static int set_bitmap_file(mddev_t *mddev, int fd)
5441 if (!mddev->pers->quiesce)
5443 if (mddev->recovery || mddev->sync_thread)
5445 /* we should be able to change the bitmap.. */
5451 return -EEXIST; /* cannot add when bitmap is present */
5452 mddev->bitmap_info.file = fget(fd);
5454 if (mddev->bitmap_info.file == NULL) {
5455 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
5460 err = deny_bitmap_write_access(mddev->bitmap_info.file);
5462 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
5464 fput(mddev->bitmap_info.file);
5465 mddev->bitmap_info.file = NULL;
5468 mddev->bitmap_info.offset = 0; /* file overrides offset */
5469 } else if (mddev->bitmap == NULL)
5470 return -ENOENT; /* cannot remove what isn't there */
5473 mddev->pers->quiesce(mddev, 1);
5475 err = bitmap_create(mddev);
5477 err = bitmap_load(mddev);
5479 if (fd < 0 || err) {
5480 bitmap_destroy(mddev);
5481 fd = -1; /* make sure to put the file */
5483 mddev->pers->quiesce(mddev, 0);
5486 if (mddev->bitmap_info.file) {
5487 restore_bitmap_write_access(mddev->bitmap_info.file);
5488 fput(mddev->bitmap_info.file);
5490 mddev->bitmap_info.file = NULL;
5497 * set_array_info is used two different ways
5498 * The original usage is when creating a new array.
5499 * In this usage, raid_disks is > 0 and it together with
5500 * level, size, not_persistent,layout,chunksize determine the
5501 * shape of the array.
5502 * This will always create an array with a type-0.90.0 superblock.
5503 * The newer usage is when assembling an array.
5504 * In this case raid_disks will be 0, and the major_version field is
5505 * use to determine which style super-blocks are to be found on the devices.
5506 * The minor and patch _version numbers are also kept incase the
5507 * super_block handler wishes to interpret them.
5509 static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
5512 if (info->raid_disks == 0) {
5513 /* just setting version number for superblock loading */
5514 if (info->major_version < 0 ||
5515 info->major_version >= ARRAY_SIZE(super_types) ||
5516 super_types[info->major_version].name == NULL) {
5517 /* maybe try to auto-load a module? */
5519 "md: superblock version %d not known\n",
5520 info->major_version);
5523 mddev->major_version = info->major_version;
5524 mddev->minor_version = info->minor_version;
5525 mddev->patch_version = info->patch_version;
5526 mddev->persistent = !info->not_persistent;
5527 /* ensure mddev_put doesn't delete this now that there
5528 * is some minimal configuration.
5530 mddev->ctime = get_seconds();
5533 mddev->major_version = MD_MAJOR_VERSION;
5534 mddev->minor_version = MD_MINOR_VERSION;
5535 mddev->patch_version = MD_PATCHLEVEL_VERSION;
5536 mddev->ctime = get_seconds();
5538 mddev->level = info->level;
5539 mddev->clevel[0] = 0;
5540 mddev->dev_sectors = 2 * (sector_t)info->size;
5541 mddev->raid_disks = info->raid_disks;
5542 /* don't set md_minor, it is determined by which /dev/md* was
5545 if (info->state & (1<<MD_SB_CLEAN))
5546 mddev->recovery_cp = MaxSector;
5548 mddev->recovery_cp = 0;
5549 mddev->persistent = ! info->not_persistent;
5550 mddev->external = 0;
5552 mddev->layout = info->layout;
5553 mddev->chunk_sectors = info->chunk_size >> 9;
5555 mddev->max_disks = MD_SB_DISKS;
5557 if (mddev->persistent)
5559 set_bit(MD_CHANGE_DEVS, &mddev->flags);
5561 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
5562 mddev->bitmap_info.offset = 0;
5564 mddev->reshape_position = MaxSector;
5567 * Generate a 128 bit UUID
5569 get_random_bytes(mddev->uuid, 16);
5571 mddev->new_level = mddev->level;
5572 mddev->new_chunk_sectors = mddev->chunk_sectors;
5573 mddev->new_layout = mddev->layout;
5574 mddev->delta_disks = 0;
5579 void md_set_array_sectors(mddev_t *mddev, sector_t array_sectors)
5581 WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__);
5583 if (mddev->external_size)
5586 mddev->array_sectors = array_sectors;
5588 EXPORT_SYMBOL(md_set_array_sectors);
5590 static int update_size(mddev_t *mddev, sector_t num_sectors)
5594 int fit = (num_sectors == 0);
5596 if (mddev->pers->resize == NULL)
5598 /* The "num_sectors" is the number of sectors of each device that
5599 * is used. This can only make sense for arrays with redundancy.
5600 * linear and raid0 always use whatever space is available. We can only
5601 * consider changing this number if no resync or reconstruction is
5602 * happening, and if the new size is acceptable. It must fit before the
5603 * sb_start or, if that is <data_offset, it must fit before the size
5604 * of each device. If num_sectors is zero, we find the largest size
5607 if (mddev->sync_thread)
5610 /* Sorry, cannot grow a bitmap yet, just remove it,
5614 list_for_each_entry(rdev, &mddev->disks, same_set) {
5615 sector_t avail = rdev->sectors;
5617 if (fit && (num_sectors == 0 || num_sectors > avail))
5618 num_sectors = avail;
5619 if (avail < num_sectors)
5622 rv = mddev->pers->resize(mddev, num_sectors);
5624 revalidate_disk(mddev->gendisk);
5628 static int update_raid_disks(mddev_t *mddev, int raid_disks)
5631 /* change the number of raid disks */
5632 if (mddev->pers->check_reshape == NULL)
5634 if (raid_disks <= 0 ||
5635 (mddev->max_disks && raid_disks >= mddev->max_disks))
5637 if (mddev->sync_thread || mddev->reshape_position != MaxSector)
5639 mddev->delta_disks = raid_disks - mddev->raid_disks;
5641 rv = mddev->pers->check_reshape(mddev);
5643 mddev->delta_disks = 0;
5649 * update_array_info is used to change the configuration of an
5651 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
5652 * fields in the info are checked against the array.
5653 * Any differences that cannot be handled will cause an error.
5654 * Normally, only one change can be managed at a time.
5656 static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
5662 /* calculate expected state,ignoring low bits */
5663 if (mddev->bitmap && mddev->bitmap_info.offset)
5664 state |= (1 << MD_SB_BITMAP_PRESENT);
5666 if (mddev->major_version != info->major_version ||
5667 mddev->minor_version != info->minor_version ||
5668 /* mddev->patch_version != info->patch_version || */
5669 mddev->ctime != info->ctime ||
5670 mddev->level != info->level ||
5671 /* mddev->layout != info->layout || */
5672 !mddev->persistent != info->not_persistent||
5673 mddev->chunk_sectors != info->chunk_size >> 9 ||
5674 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
5675 ((state^info->state) & 0xfffffe00)
5678 /* Check there is only one change */
5679 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
5681 if (mddev->raid_disks != info->raid_disks)
5683 if (mddev->layout != info->layout)
5685 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT))
5692 if (mddev->layout != info->layout) {
5694 * we don't need to do anything at the md level, the
5695 * personality will take care of it all.
5697 if (mddev->pers->check_reshape == NULL)
5700 mddev->new_layout = info->layout;
5701 rv = mddev->pers->check_reshape(mddev);
5703 mddev->new_layout = mddev->layout;
5707 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
5708 rv = update_size(mddev, (sector_t)info->size * 2);
5710 if (mddev->raid_disks != info->raid_disks)
5711 rv = update_raid_disks(mddev, info->raid_disks);
5713 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
5714 if (mddev->pers->quiesce == NULL)
5716 if (mddev->recovery || mddev->sync_thread)
5718 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
5719 /* add the bitmap */
5722 if (mddev->bitmap_info.default_offset == 0)
5724 mddev->bitmap_info.offset =
5725 mddev->bitmap_info.default_offset;
5726 mddev->pers->quiesce(mddev, 1);
5727 rv = bitmap_create(mddev);
5729 rv = bitmap_load(mddev);
5731 bitmap_destroy(mddev);
5732 mddev->pers->quiesce(mddev, 0);
5734 /* remove the bitmap */
5737 if (mddev->bitmap->file)
5739 mddev->pers->quiesce(mddev, 1);
5740 bitmap_destroy(mddev);
5741 mddev->pers->quiesce(mddev, 0);
5742 mddev->bitmap_info.offset = 0;
5745 md_update_sb(mddev, 1);
5749 static int set_disk_faulty(mddev_t *mddev, dev_t dev)
5753 if (mddev->pers == NULL)
5756 rdev = find_rdev(mddev, dev);
5760 md_error(mddev, rdev);
5765 * We have a problem here : there is no easy way to give a CHS
5766 * virtual geometry. We currently pretend that we have a 2 heads
5767 * 4 sectors (with a BIG number of cylinders...). This drives
5768 * dosfs just mad... ;-)
5770 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
5772 mddev_t *mddev = bdev->bd_disk->private_data;
5776 geo->cylinders = mddev->array_sectors / 8;
5780 static int md_ioctl(struct block_device *bdev, fmode_t mode,
5781 unsigned int cmd, unsigned long arg)
5784 void __user *argp = (void __user *)arg;
5785 mddev_t *mddev = NULL;
5788 if (!capable(CAP_SYS_ADMIN))
5792 * Commands dealing with the RAID driver but not any
5798 err = get_version(argp);
5801 case PRINT_RAID_DEBUG:
5809 autostart_arrays(arg);
5816 * Commands creating/starting a new array:
5819 mddev = bdev->bd_disk->private_data;
5826 err = mddev_lock(mddev);
5829 "md: ioctl lock interrupted, reason %d, cmd %d\n",
5836 case SET_ARRAY_INFO:
5838 mdu_array_info_t info;
5840 memset(&info, 0, sizeof(info));
5841 else if (copy_from_user(&info, argp, sizeof(info))) {
5846 err = update_array_info(mddev, &info);
5848 printk(KERN_WARNING "md: couldn't update"
5849 " array info. %d\n", err);
5854 if (!list_empty(&mddev->disks)) {
5856 "md: array %s already has disks!\n",
5861 if (mddev->raid_disks) {
5863 "md: array %s already initialised!\n",
5868 err = set_array_info(mddev, &info);
5870 printk(KERN_WARNING "md: couldn't set"
5871 " array info. %d\n", err);
5881 * Commands querying/configuring an existing array:
5883 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
5884 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
5885 if ((!mddev->raid_disks && !mddev->external)
5886 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
5887 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
5888 && cmd != GET_BITMAP_FILE) {
5894 * Commands even a read-only array can execute:
5898 case GET_ARRAY_INFO:
5899 err = get_array_info(mddev, argp);
5902 case GET_BITMAP_FILE:
5903 err = get_bitmap_file(mddev, argp);
5907 err = get_disk_info(mddev, argp);
5910 case RESTART_ARRAY_RW:
5911 err = restart_array(mddev);
5915 err = do_md_stop(mddev, 0, 1);
5919 err = md_set_readonly(mddev, 1);
5923 if (get_user(ro, (int __user *)(arg))) {
5929 /* if the bdev is going readonly the value of mddev->ro
5930 * does not matter, no writes are coming
5935 /* are we are already prepared for writes? */
5939 /* transitioning to readauto need only happen for
5940 * arrays that call md_write_start
5943 err = restart_array(mddev);
5946 set_disk_ro(mddev->gendisk, 0);
5953 * The remaining ioctls are changing the state of the
5954 * superblock, so we do not allow them on read-only arrays.
5955 * However non-MD ioctls (e.g. get-size) will still come through
5956 * here and hit the 'default' below, so only disallow
5957 * 'md' ioctls, and switch to rw mode if started auto-readonly.
5959 if (_IOC_TYPE(cmd) == MD_MAJOR && mddev->ro && mddev->pers) {
5960 if (mddev->ro == 2) {
5962 sysfs_notify_dirent_safe(mddev->sysfs_state);
5963 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5964 md_wakeup_thread(mddev->thread);
5975 mdu_disk_info_t info;
5976 if (copy_from_user(&info, argp, sizeof(info)))
5979 err = add_new_disk(mddev, &info);
5983 case HOT_REMOVE_DISK:
5984 err = hot_remove_disk(mddev, new_decode_dev(arg));
5988 err = hot_add_disk(mddev, new_decode_dev(arg));
5991 case SET_DISK_FAULTY:
5992 err = set_disk_faulty(mddev, new_decode_dev(arg));
5996 err = do_md_run(mddev);
5999 case SET_BITMAP_FILE:
6000 err = set_bitmap_file(mddev, (int)arg);
6010 if (mddev->hold_active == UNTIL_IOCTL &&
6012 mddev->hold_active = 0;
6013 mddev_unlock(mddev);
6022 #ifdef CONFIG_COMPAT
6023 static int md_compat_ioctl(struct block_device *bdev, fmode_t mode,
6024 unsigned int cmd, unsigned long arg)
6027 case HOT_REMOVE_DISK:
6029 case SET_DISK_FAULTY:
6030 case SET_BITMAP_FILE:
6031 /* These take in integer arg, do not convert */
6034 arg = (unsigned long)compat_ptr(arg);
6038 return md_ioctl(bdev, mode, cmd, arg);
6040 #endif /* CONFIG_COMPAT */
6042 static int md_open(struct block_device *bdev, fmode_t mode)
6045 * Succeed if we can lock the mddev, which confirms that
6046 * it isn't being stopped right now.
6048 mddev_t *mddev = mddev_find(bdev->bd_dev);
6051 if (mddev->gendisk != bdev->bd_disk) {
6052 /* we are racing with mddev_put which is discarding this
6056 /* Wait until bdev->bd_disk is definitely gone */
6057 flush_workqueue(md_misc_wq);
6058 /* Then retry the open from the top */
6059 return -ERESTARTSYS;
6061 BUG_ON(mddev != bdev->bd_disk->private_data);
6063 if ((err = mutex_lock_interruptible(&mddev->open_mutex)))
6067 atomic_inc(&mddev->openers);
6068 mutex_unlock(&mddev->open_mutex);
6070 check_disk_change(bdev);
6075 static int md_release(struct gendisk *disk, fmode_t mode)
6077 mddev_t *mddev = disk->private_data;
6080 atomic_dec(&mddev->openers);
6086 static int md_media_changed(struct gendisk *disk)
6088 mddev_t *mddev = disk->private_data;
6090 return mddev->changed;
6093 static int md_revalidate(struct gendisk *disk)
6095 mddev_t *mddev = disk->private_data;
6100 static const struct block_device_operations md_fops =
6102 .owner = THIS_MODULE,
6104 .release = md_release,
6106 #ifdef CONFIG_COMPAT
6107 .compat_ioctl = md_compat_ioctl,
6109 .getgeo = md_getgeo,
6110 .media_changed = md_media_changed,
6111 .revalidate_disk= md_revalidate,
6114 static int md_thread(void * arg)
6116 mdk_thread_t *thread = arg;
6119 * md_thread is a 'system-thread', it's priority should be very
6120 * high. We avoid resource deadlocks individually in each
6121 * raid personality. (RAID5 does preallocation) We also use RR and
6122 * the very same RT priority as kswapd, thus we will never get
6123 * into a priority inversion deadlock.
6125 * we definitely have to have equal or higher priority than
6126 * bdflush, otherwise bdflush will deadlock if there are too
6127 * many dirty RAID5 blocks.
6130 allow_signal(SIGKILL);
6131 while (!kthread_should_stop()) {
6133 /* We need to wait INTERRUPTIBLE so that
6134 * we don't add to the load-average.
6135 * That means we need to be sure no signals are
6138 if (signal_pending(current))
6139 flush_signals(current);
6141 wait_event_interruptible_timeout
6143 test_bit(THREAD_WAKEUP, &thread->flags)
6144 || kthread_should_stop(),
6147 clear_bit(THREAD_WAKEUP, &thread->flags);
6148 if (!kthread_should_stop())
6149 thread->run(thread->mddev);
6155 void md_wakeup_thread(mdk_thread_t *thread)
6158 dprintk("md: waking up MD thread %s.\n", thread->tsk->comm);
6159 set_bit(THREAD_WAKEUP, &thread->flags);
6160 wake_up(&thread->wqueue);
6164 mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
6167 mdk_thread_t *thread;
6169 thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL);
6173 init_waitqueue_head(&thread->wqueue);
6176 thread->mddev = mddev;
6177 thread->timeout = MAX_SCHEDULE_TIMEOUT;
6178 thread->tsk = kthread_run(md_thread, thread,
6180 mdname(thread->mddev),
6181 name ?: mddev->pers->name);
6182 if (IS_ERR(thread->tsk)) {
6189 void md_unregister_thread(mdk_thread_t *thread)
6193 dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
6195 kthread_stop(thread->tsk);
6199 void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
6206 if (!rdev || test_bit(Faulty, &rdev->flags))
6209 if (mddev->external)
6210 set_bit(Blocked, &rdev->flags);
6212 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
6214 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
6215 __builtin_return_address(0),__builtin_return_address(1),
6216 __builtin_return_address(2),__builtin_return_address(3));
6220 if (!mddev->pers->error_handler)
6222 mddev->pers->error_handler(mddev,rdev);
6223 if (mddev->degraded)
6224 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6225 sysfs_notify_dirent_safe(rdev->sysfs_state);
6226 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6227 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6228 md_wakeup_thread(mddev->thread);
6229 if (mddev->event_work.func)
6230 queue_work(md_misc_wq, &mddev->event_work);
6231 md_new_event_inintr(mddev);
6234 /* seq_file implementation /proc/mdstat */
6236 static void status_unused(struct seq_file *seq)
6241 seq_printf(seq, "unused devices: ");
6243 list_for_each_entry(rdev, &pending_raid_disks, same_set) {
6244 char b[BDEVNAME_SIZE];
6246 seq_printf(seq, "%s ",
6247 bdevname(rdev->bdev,b));
6250 seq_printf(seq, "<none>");
6252 seq_printf(seq, "\n");
6256 static void status_resync(struct seq_file *seq, mddev_t * mddev)
6258 sector_t max_sectors, resync, res;
6259 unsigned long dt, db;
6262 unsigned int per_milli;
6264 resync = mddev->curr_resync - atomic_read(&mddev->recovery_active);
6266 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
6267 max_sectors = mddev->resync_max_sectors;
6269 max_sectors = mddev->dev_sectors;
6272 * Should not happen.
6278 /* Pick 'scale' such that (resync>>scale)*1000 will fit
6279 * in a sector_t, and (max_sectors>>scale) will fit in a
6280 * u32, as those are the requirements for sector_div.
6281 * Thus 'scale' must be at least 10
6284 if (sizeof(sector_t) > sizeof(unsigned long)) {
6285 while ( max_sectors/2 > (1ULL<<(scale+32)))
6288 res = (resync>>scale)*1000;
6289 sector_div(res, (u32)((max_sectors>>scale)+1));
6293 int i, x = per_milli/50, y = 20-x;
6294 seq_printf(seq, "[");
6295 for (i = 0; i < x; i++)
6296 seq_printf(seq, "=");
6297 seq_printf(seq, ">");
6298 for (i = 0; i < y; i++)
6299 seq_printf(seq, ".");
6300 seq_printf(seq, "] ");
6302 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
6303 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
6305 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
6307 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
6308 "resync" : "recovery"))),
6309 per_milli/10, per_milli % 10,
6310 (unsigned long long) resync/2,
6311 (unsigned long long) max_sectors/2);
6314 * dt: time from mark until now
6315 * db: blocks written from mark until now
6316 * rt: remaining time
6318 * rt is a sector_t, so could be 32bit or 64bit.
6319 * So we divide before multiply in case it is 32bit and close
6321 * We scale the divisor (db) by 32 to avoid losing precision
6322 * near the end of resync when the number of remaining sectors
6324 * We then divide rt by 32 after multiplying by db to compensate.
6325 * The '+1' avoids division by zero if db is very small.
6327 dt = ((jiffies - mddev->resync_mark) / HZ);
6329 db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active))
6330 - mddev->resync_mark_cnt;
6332 rt = max_sectors - resync; /* number of remaining sectors */
6333 sector_div(rt, db/32+1);
6337 seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60,
6338 ((unsigned long)rt % 60)/6);
6340 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
6343 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
6345 struct list_head *tmp;
6355 spin_lock(&all_mddevs_lock);
6356 list_for_each(tmp,&all_mddevs)
6358 mddev = list_entry(tmp, mddev_t, all_mddevs);
6360 spin_unlock(&all_mddevs_lock);
6363 spin_unlock(&all_mddevs_lock);
6365 return (void*)2;/* tail */
6369 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
6371 struct list_head *tmp;
6372 mddev_t *next_mddev, *mddev = v;
6378 spin_lock(&all_mddevs_lock);
6380 tmp = all_mddevs.next;
6382 tmp = mddev->all_mddevs.next;
6383 if (tmp != &all_mddevs)
6384 next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs));
6386 next_mddev = (void*)2;
6389 spin_unlock(&all_mddevs_lock);
6397 static void md_seq_stop(struct seq_file *seq, void *v)
6401 if (mddev && v != (void*)1 && v != (void*)2)
6405 struct mdstat_info {
6409 static int md_seq_show(struct seq_file *seq, void *v)
6414 struct mdstat_info *mi = seq->private;
6415 struct bitmap *bitmap;
6417 if (v == (void*)1) {
6418 struct mdk_personality *pers;
6419 seq_printf(seq, "Personalities : ");
6420 spin_lock(&pers_lock);
6421 list_for_each_entry(pers, &pers_list, list)
6422 seq_printf(seq, "[%s] ", pers->name);
6424 spin_unlock(&pers_lock);
6425 seq_printf(seq, "\n");
6426 mi->event = atomic_read(&md_event_count);
6429 if (v == (void*)2) {
6434 if (mddev_lock(mddev) < 0)
6437 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
6438 seq_printf(seq, "%s : %sactive", mdname(mddev),
6439 mddev->pers ? "" : "in");
6442 seq_printf(seq, " (read-only)");
6444 seq_printf(seq, " (auto-read-only)");
6445 seq_printf(seq, " %s", mddev->pers->name);
6449 list_for_each_entry(rdev, &mddev->disks, same_set) {
6450 char b[BDEVNAME_SIZE];
6451 seq_printf(seq, " %s[%d]",
6452 bdevname(rdev->bdev,b), rdev->desc_nr);
6453 if (test_bit(WriteMostly, &rdev->flags))
6454 seq_printf(seq, "(W)");
6455 if (test_bit(Faulty, &rdev->flags)) {
6456 seq_printf(seq, "(F)");
6458 } else if (rdev->raid_disk < 0)
6459 seq_printf(seq, "(S)"); /* spare */
6460 sectors += rdev->sectors;
6463 if (!list_empty(&mddev->disks)) {
6465 seq_printf(seq, "\n %llu blocks",
6466 (unsigned long long)
6467 mddev->array_sectors / 2);
6469 seq_printf(seq, "\n %llu blocks",
6470 (unsigned long long)sectors / 2);
6472 if (mddev->persistent) {
6473 if (mddev->major_version != 0 ||
6474 mddev->minor_version != 90) {
6475 seq_printf(seq," super %d.%d",
6476 mddev->major_version,
6477 mddev->minor_version);
6479 } else if (mddev->external)
6480 seq_printf(seq, " super external:%s",
6481 mddev->metadata_type);
6483 seq_printf(seq, " super non-persistent");
6486 mddev->pers->status(seq, mddev);
6487 seq_printf(seq, "\n ");
6488 if (mddev->pers->sync_request) {
6489 if (mddev->curr_resync > 2) {
6490 status_resync(seq, mddev);
6491 seq_printf(seq, "\n ");
6492 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
6493 seq_printf(seq, "\tresync=DELAYED\n ");
6494 else if (mddev->recovery_cp < MaxSector)
6495 seq_printf(seq, "\tresync=PENDING\n ");
6498 seq_printf(seq, "\n ");
6500 if ((bitmap = mddev->bitmap)) {
6501 unsigned long chunk_kb;
6502 unsigned long flags;
6503 spin_lock_irqsave(&bitmap->lock, flags);
6504 chunk_kb = mddev->bitmap_info.chunksize >> 10;
6505 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
6507 bitmap->pages - bitmap->missing_pages,
6509 (bitmap->pages - bitmap->missing_pages)
6510 << (PAGE_SHIFT - 10),
6511 chunk_kb ? chunk_kb : mddev->bitmap_info.chunksize,
6512 chunk_kb ? "KB" : "B");
6514 seq_printf(seq, ", file: ");
6515 seq_path(seq, &bitmap->file->f_path, " \t\n");
6518 seq_printf(seq, "\n");
6519 spin_unlock_irqrestore(&bitmap->lock, flags);
6522 seq_printf(seq, "\n");
6524 mddev_unlock(mddev);
6529 static const struct seq_operations md_seq_ops = {
6530 .start = md_seq_start,
6531 .next = md_seq_next,
6532 .stop = md_seq_stop,
6533 .show = md_seq_show,
6536 static int md_seq_open(struct inode *inode, struct file *file)
6539 struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL);
6543 error = seq_open(file, &md_seq_ops);
6547 struct seq_file *p = file->private_data;
6549 mi->event = atomic_read(&md_event_count);
6554 static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
6556 struct seq_file *m = filp->private_data;
6557 struct mdstat_info *mi = m->private;
6560 poll_wait(filp, &md_event_waiters, wait);
6562 /* always allow read */
6563 mask = POLLIN | POLLRDNORM;
6565 if (mi->event != atomic_read(&md_event_count))
6566 mask |= POLLERR | POLLPRI;
6570 static const struct file_operations md_seq_fops = {
6571 .owner = THIS_MODULE,
6572 .open = md_seq_open,
6574 .llseek = seq_lseek,
6575 .release = seq_release_private,
6576 .poll = mdstat_poll,
6579 int register_md_personality(struct mdk_personality *p)
6581 spin_lock(&pers_lock);
6582 list_add_tail(&p->list, &pers_list);
6583 printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level);
6584 spin_unlock(&pers_lock);
6588 int unregister_md_personality(struct mdk_personality *p)
6590 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
6591 spin_lock(&pers_lock);
6592 list_del_init(&p->list);
6593 spin_unlock(&pers_lock);
6597 static int is_mddev_idle(mddev_t *mddev, int init)
6605 rdev_for_each_rcu(rdev, mddev) {
6606 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
6607 curr_events = (int)part_stat_read(&disk->part0, sectors[0]) +
6608 (int)part_stat_read(&disk->part0, sectors[1]) -
6609 atomic_read(&disk->sync_io);
6610 /* sync IO will cause sync_io to increase before the disk_stats
6611 * as sync_io is counted when a request starts, and
6612 * disk_stats is counted when it completes.
6613 * So resync activity will cause curr_events to be smaller than
6614 * when there was no such activity.
6615 * non-sync IO will cause disk_stat to increase without
6616 * increasing sync_io so curr_events will (eventually)
6617 * be larger than it was before. Once it becomes
6618 * substantially larger, the test below will cause
6619 * the array to appear non-idle, and resync will slow
6621 * If there is a lot of outstanding resync activity when
6622 * we set last_event to curr_events, then all that activity
6623 * completing might cause the array to appear non-idle
6624 * and resync will be slowed down even though there might
6625 * not have been non-resync activity. This will only
6626 * happen once though. 'last_events' will soon reflect
6627 * the state where there is little or no outstanding
6628 * resync requests, and further resync activity will
6629 * always make curr_events less than last_events.
6632 if (init || curr_events - rdev->last_events > 64) {
6633 rdev->last_events = curr_events;
6641 void md_done_sync(mddev_t *mddev, int blocks, int ok)
6643 /* another "blocks" (512byte) blocks have been synced */
6644 atomic_sub(blocks, &mddev->recovery_active);
6645 wake_up(&mddev->recovery_wait);
6647 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6648 md_wakeup_thread(mddev->thread);
6649 // stop recovery, signal do_sync ....
6654 /* md_write_start(mddev, bi)
6655 * If we need to update some array metadata (e.g. 'active' flag
6656 * in superblock) before writing, schedule a superblock update
6657 * and wait for it to complete.
6659 void md_write_start(mddev_t *mddev, struct bio *bi)
6662 if (bio_data_dir(bi) != WRITE)
6665 BUG_ON(mddev->ro == 1);
6666 if (mddev->ro == 2) {
6667 /* need to switch to read/write */
6669 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6670 md_wakeup_thread(mddev->thread);
6671 md_wakeup_thread(mddev->sync_thread);
6674 atomic_inc(&mddev->writes_pending);
6675 if (mddev->safemode == 1)
6676 mddev->safemode = 0;
6677 if (mddev->in_sync) {
6678 spin_lock_irq(&mddev->write_lock);
6679 if (mddev->in_sync) {
6681 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6682 set_bit(MD_CHANGE_PENDING, &mddev->flags);
6683 md_wakeup_thread(mddev->thread);
6686 spin_unlock_irq(&mddev->write_lock);
6689 sysfs_notify_dirent_safe(mddev->sysfs_state);
6690 wait_event(mddev->sb_wait,
6691 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
6694 void md_write_end(mddev_t *mddev)
6696 if (atomic_dec_and_test(&mddev->writes_pending)) {
6697 if (mddev->safemode == 2)
6698 md_wakeup_thread(mddev->thread);
6699 else if (mddev->safemode_delay)
6700 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
6704 /* md_allow_write(mddev)
6705 * Calling this ensures that the array is marked 'active' so that writes
6706 * may proceed without blocking. It is important to call this before
6707 * attempting a GFP_KERNEL allocation while holding the mddev lock.
6708 * Must be called with mddev_lock held.
6710 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
6711 * is dropped, so return -EAGAIN after notifying userspace.
6713 int md_allow_write(mddev_t *mddev)
6719 if (!mddev->pers->sync_request)
6722 spin_lock_irq(&mddev->write_lock);
6723 if (mddev->in_sync) {
6725 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6726 set_bit(MD_CHANGE_PENDING, &mddev->flags);
6727 if (mddev->safemode_delay &&
6728 mddev->safemode == 0)
6729 mddev->safemode = 1;
6730 spin_unlock_irq(&mddev->write_lock);
6731 md_update_sb(mddev, 0);
6732 sysfs_notify_dirent_safe(mddev->sysfs_state);
6734 spin_unlock_irq(&mddev->write_lock);
6736 if (test_bit(MD_CHANGE_PENDING, &mddev->flags))
6741 EXPORT_SYMBOL_GPL(md_allow_write);
6743 #define SYNC_MARKS 10
6744 #define SYNC_MARK_STEP (3*HZ)
6745 void md_do_sync(mddev_t *mddev)
6748 unsigned int currspeed = 0,
6750 sector_t max_sectors,j, io_sectors;
6751 unsigned long mark[SYNC_MARKS];
6752 sector_t mark_cnt[SYNC_MARKS];
6754 struct list_head *tmp;
6755 sector_t last_check;
6760 /* just incase thread restarts... */
6761 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
6763 if (mddev->ro) /* never try to sync a read-only array */
6766 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
6767 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
6768 desc = "data-check";
6769 else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
6770 desc = "requested-resync";
6773 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
6778 /* we overload curr_resync somewhat here.
6779 * 0 == not engaged in resync at all
6780 * 2 == checking that there is no conflict with another sync
6781 * 1 == like 2, but have yielded to allow conflicting resync to
6783 * other == active in resync - this many blocks
6785 * Before starting a resync we must have set curr_resync to
6786 * 2, and then checked that every "conflicting" array has curr_resync
6787 * less than ours. When we find one that is the same or higher
6788 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
6789 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
6790 * This will mean we have to start checking from the beginning again.
6795 mddev->curr_resync = 2;
6798 if (kthread_should_stop())
6799 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6801 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
6803 for_each_mddev(mddev2, tmp) {
6804 if (mddev2 == mddev)
6806 if (!mddev->parallel_resync
6807 && mddev2->curr_resync
6808 && match_mddev_units(mddev, mddev2)) {
6810 if (mddev < mddev2 && mddev->curr_resync == 2) {
6811 /* arbitrarily yield */
6812 mddev->curr_resync = 1;
6813 wake_up(&resync_wait);
6815 if (mddev > mddev2 && mddev->curr_resync == 1)
6816 /* no need to wait here, we can wait the next
6817 * time 'round when curr_resync == 2
6820 /* We need to wait 'interruptible' so as not to
6821 * contribute to the load average, and not to
6822 * be caught by 'softlockup'
6824 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
6825 if (!kthread_should_stop() &&
6826 mddev2->curr_resync >= mddev->curr_resync) {
6827 printk(KERN_INFO "md: delaying %s of %s"
6828 " until %s has finished (they"
6829 " share one or more physical units)\n",
6830 desc, mdname(mddev), mdname(mddev2));
6832 if (signal_pending(current))
6833 flush_signals(current);
6835 finish_wait(&resync_wait, &wq);
6838 finish_wait(&resync_wait, &wq);
6841 } while (mddev->curr_resync < 2);
6844 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
6845 /* resync follows the size requested by the personality,
6846 * which defaults to physical size, but can be virtual size
6848 max_sectors = mddev->resync_max_sectors;
6849 mddev->resync_mismatches = 0;
6850 /* we don't use the checkpoint if there's a bitmap */
6851 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
6852 j = mddev->resync_min;
6853 else if (!mddev->bitmap)
6854 j = mddev->recovery_cp;
6856 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
6857 max_sectors = mddev->dev_sectors;
6859 /* recovery follows the physical size of devices */
6860 max_sectors = mddev->dev_sectors;
6863 list_for_each_entry_rcu(rdev, &mddev->disks, same_set)
6864 if (rdev->raid_disk >= 0 &&
6865 !test_bit(Faulty, &rdev->flags) &&
6866 !test_bit(In_sync, &rdev->flags) &&
6867 rdev->recovery_offset < j)
6868 j = rdev->recovery_offset;
6872 printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev));
6873 printk(KERN_INFO "md: minimum _guaranteed_ speed:"
6874 " %d KB/sec/disk.\n", speed_min(mddev));
6875 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
6876 "(but not more than %d KB/sec) for %s.\n",
6877 speed_max(mddev), desc);
6879 is_mddev_idle(mddev, 1); /* this initializes IO event counters */
6882 for (m = 0; m < SYNC_MARKS; m++) {
6884 mark_cnt[m] = io_sectors;
6887 mddev->resync_mark = mark[last_mark];
6888 mddev->resync_mark_cnt = mark_cnt[last_mark];
6891 * Tune reconstruction:
6893 window = 32*(PAGE_SIZE/512);
6894 printk(KERN_INFO "md: using %dk window, over a total of %lluk.\n",
6895 window/2, (unsigned long long)max_sectors/2);
6897 atomic_set(&mddev->recovery_active, 0);
6902 "md: resuming %s of %s from checkpoint.\n",
6903 desc, mdname(mddev));
6904 mddev->curr_resync = j;
6906 mddev->curr_resync_completed = j;
6908 while (j < max_sectors) {
6913 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
6914 ((mddev->curr_resync > mddev->curr_resync_completed &&
6915 (mddev->curr_resync - mddev->curr_resync_completed)
6916 > (max_sectors >> 4)) ||
6917 (j - mddev->curr_resync_completed)*2
6918 >= mddev->resync_max - mddev->curr_resync_completed
6920 /* time to update curr_resync_completed */
6921 wait_event(mddev->recovery_wait,
6922 atomic_read(&mddev->recovery_active) == 0);
6923 mddev->curr_resync_completed = j;
6924 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6925 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
6928 while (j >= mddev->resync_max && !kthread_should_stop()) {
6929 /* As this condition is controlled by user-space,
6930 * we can block indefinitely, so use '_interruptible'
6931 * to avoid triggering warnings.
6933 flush_signals(current); /* just in case */
6934 wait_event_interruptible(mddev->recovery_wait,
6935 mddev->resync_max > j
6936 || kthread_should_stop());
6939 if (kthread_should_stop())
6942 sectors = mddev->pers->sync_request(mddev, j, &skipped,
6943 currspeed < speed_min(mddev));
6945 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6949 if (!skipped) { /* actual IO requested */
6950 io_sectors += sectors;
6951 atomic_add(sectors, &mddev->recovery_active);
6955 if (j>1) mddev->curr_resync = j;
6956 mddev->curr_mark_cnt = io_sectors;
6957 if (last_check == 0)
6958 /* this is the earliers that rebuilt will be
6959 * visible in /proc/mdstat
6961 md_new_event(mddev);
6963 if (last_check + window > io_sectors || j == max_sectors)
6966 last_check = io_sectors;
6968 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
6972 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
6974 int next = (last_mark+1) % SYNC_MARKS;
6976 mddev->resync_mark = mark[next];
6977 mddev->resync_mark_cnt = mark_cnt[next];
6978 mark[next] = jiffies;
6979 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
6984 if (kthread_should_stop())
6989 * this loop exits only if either when we are slower than
6990 * the 'hard' speed limit, or the system was IO-idle for
6992 * the system might be non-idle CPU-wise, but we only care
6993 * about not overloading the IO subsystem. (things like an
6994 * e2fsck being done on the RAID array should execute fast)
6998 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
6999 /((jiffies-mddev->resync_mark)/HZ +1) +1;
7001 if (currspeed > speed_min(mddev)) {
7002 if ((currspeed > speed_max(mddev)) ||
7003 !is_mddev_idle(mddev, 0)) {
7009 printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc);
7011 * this also signals 'finished resyncing' to md_stop
7014 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
7016 /* tell personality that we are finished */
7017 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
7019 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
7020 mddev->curr_resync > 2) {
7021 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
7022 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
7023 if (mddev->curr_resync >= mddev->recovery_cp) {
7025 "md: checkpointing %s of %s.\n",
7026 desc, mdname(mddev));
7027 mddev->recovery_cp = mddev->curr_resync;
7030 mddev->recovery_cp = MaxSector;
7032 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
7033 mddev->curr_resync = MaxSector;
7035 list_for_each_entry_rcu(rdev, &mddev->disks, same_set)
7036 if (rdev->raid_disk >= 0 &&
7037 mddev->delta_disks >= 0 &&
7038 !test_bit(Faulty, &rdev->flags) &&
7039 !test_bit(In_sync, &rdev->flags) &&
7040 rdev->recovery_offset < mddev->curr_resync)
7041 rdev->recovery_offset = mddev->curr_resync;
7045 set_bit(MD_CHANGE_DEVS, &mddev->flags);
7048 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
7049 /* We completed so min/max setting can be forgotten if used. */
7050 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
7051 mddev->resync_min = 0;
7052 mddev->resync_max = MaxSector;
7053 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
7054 mddev->resync_min = mddev->curr_resync_completed;
7055 mddev->curr_resync = 0;
7056 wake_up(&resync_wait);
7057 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
7058 md_wakeup_thread(mddev->thread);
7063 * got a signal, exit.
7066 "md: md_do_sync() got signal ... exiting\n");
7067 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7071 EXPORT_SYMBOL_GPL(md_do_sync);
7073 static int remove_and_add_spares(mddev_t *mddev)
7078 mddev->curr_resync_completed = 0;
7080 list_for_each_entry(rdev, &mddev->disks, same_set)
7081 if (rdev->raid_disk >= 0 &&
7082 !test_bit(Blocked, &rdev->flags) &&
7083 (test_bit(Faulty, &rdev->flags) ||
7084 ! test_bit(In_sync, &rdev->flags)) &&
7085 atomic_read(&rdev->nr_pending)==0) {
7086 if (mddev->pers->hot_remove_disk(
7087 mddev, rdev->raid_disk)==0) {
7088 sysfs_unlink_rdev(mddev, rdev);
7089 rdev->raid_disk = -1;
7093 if (mddev->degraded) {
7094 list_for_each_entry(rdev, &mddev->disks, same_set) {
7095 if (rdev->raid_disk >= 0 &&
7096 !test_bit(In_sync, &rdev->flags) &&
7097 !test_bit(Faulty, &rdev->flags) &&
7098 !test_bit(Blocked, &rdev->flags))
7100 if (rdev->raid_disk < 0
7101 && !test_bit(Faulty, &rdev->flags)) {
7102 rdev->recovery_offset = 0;
7104 hot_add_disk(mddev, rdev) == 0) {
7105 if (sysfs_link_rdev(mddev, rdev))
7106 /* failure here is OK */;
7108 md_new_event(mddev);
7109 set_bit(MD_CHANGE_DEVS, &mddev->flags);
7118 static void reap_sync_thread(mddev_t *mddev)
7122 /* resync has finished, collect result */
7123 md_unregister_thread(mddev->sync_thread);
7124 mddev->sync_thread = NULL;
7125 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
7126 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
7128 /* activate any spares */
7129 if (mddev->pers->spare_active(mddev))
7130 sysfs_notify(&mddev->kobj, NULL,
7133 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
7134 mddev->pers->finish_reshape)
7135 mddev->pers->finish_reshape(mddev);
7136 md_update_sb(mddev, 1);
7138 /* if array is no-longer degraded, then any saved_raid_disk
7139 * information must be scrapped
7141 if (!mddev->degraded)
7142 list_for_each_entry(rdev, &mddev->disks, same_set)
7143 rdev->saved_raid_disk = -1;
7145 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7146 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7147 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
7148 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
7149 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
7150 /* flag recovery needed just to double check */
7151 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7152 sysfs_notify_dirent_safe(mddev->sysfs_action);
7153 md_new_event(mddev);
7154 if (mddev->event_work.func)
7155 queue_work(md_misc_wq, &mddev->event_work);
7159 * This routine is regularly called by all per-raid-array threads to
7160 * deal with generic issues like resync and super-block update.
7161 * Raid personalities that don't have a thread (linear/raid0) do not
7162 * need this as they never do any recovery or update the superblock.
7164 * It does not do any resync itself, but rather "forks" off other threads
7165 * to do that as needed.
7166 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
7167 * "->recovery" and create a thread at ->sync_thread.
7168 * When the thread finishes it sets MD_RECOVERY_DONE
7169 * and wakeups up this thread which will reap the thread and finish up.
7170 * This thread also removes any faulty devices (with nr_pending == 0).
7172 * The overall approach is:
7173 * 1/ if the superblock needs updating, update it.
7174 * 2/ If a recovery thread is running, don't do anything else.
7175 * 3/ If recovery has finished, clean up, possibly marking spares active.
7176 * 4/ If there are any faulty devices, remove them.
7177 * 5/ If array is degraded, try to add spares devices
7178 * 6/ If array has spares or is not in-sync, start a resync thread.
7180 void md_check_recovery(mddev_t *mddev)
7182 if (mddev->suspended)
7186 bitmap_daemon_work(mddev);
7188 if (signal_pending(current)) {
7189 if (mddev->pers->sync_request && !mddev->external) {
7190 printk(KERN_INFO "md: %s in immediate safe mode\n",
7192 mddev->safemode = 2;
7194 flush_signals(current);
7197 if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
7200 (mddev->flags & ~ (1<<MD_CHANGE_PENDING)) ||
7201 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
7202 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
7203 (mddev->external == 0 && mddev->safemode == 1) ||
7204 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
7205 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
7209 if (mddev_trylock(mddev)) {
7213 /* Only thing we do on a ro array is remove
7217 list_for_each_entry(rdev, &mddev->disks, same_set)
7218 if (rdev->raid_disk >= 0 &&
7219 !test_bit(Blocked, &rdev->flags) &&
7220 test_bit(Faulty, &rdev->flags) &&
7221 atomic_read(&rdev->nr_pending)==0) {
7222 if (mddev->pers->hot_remove_disk(
7223 mddev, rdev->raid_disk)==0) {
7224 sysfs_unlink_rdev(mddev, rdev);
7225 rdev->raid_disk = -1;
7228 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7232 if (!mddev->external) {
7234 spin_lock_irq(&mddev->write_lock);
7235 if (mddev->safemode &&
7236 !atomic_read(&mddev->writes_pending) &&
7238 mddev->recovery_cp == MaxSector) {
7241 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
7243 if (mddev->safemode == 1)
7244 mddev->safemode = 0;
7245 spin_unlock_irq(&mddev->write_lock);
7247 sysfs_notify_dirent_safe(mddev->sysfs_state);
7251 md_update_sb(mddev, 0);
7253 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
7254 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
7255 /* resync/recovery still happening */
7256 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7259 if (mddev->sync_thread) {
7260 reap_sync_thread(mddev);
7263 /* Set RUNNING before clearing NEEDED to avoid
7264 * any transients in the value of "sync_action".
7266 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7267 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7268 /* Clear some bits that don't mean anything, but
7271 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
7272 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
7274 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
7276 /* no recovery is running.
7277 * remove any failed drives, then
7278 * add spares if possible.
7279 * Spare are also removed and re-added, to allow
7280 * the personality to fail the re-add.
7283 if (mddev->reshape_position != MaxSector) {
7284 if (mddev->pers->check_reshape == NULL ||
7285 mddev->pers->check_reshape(mddev) != 0)
7286 /* Cannot proceed */
7288 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
7289 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7290 } else if ((spares = remove_and_add_spares(mddev))) {
7291 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7292 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
7293 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
7294 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7295 } else if (mddev->recovery_cp < MaxSector) {
7296 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7297 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
7298 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
7299 /* nothing to be done ... */
7302 if (mddev->pers->sync_request) {
7303 if (spares && mddev->bitmap && ! mddev->bitmap->file) {
7304 /* We are adding a device or devices to an array
7305 * which has the bitmap stored on all devices.
7306 * So make sure all bitmap pages get written
7308 bitmap_write_all(mddev->bitmap);
7310 mddev->sync_thread = md_register_thread(md_do_sync,
7313 if (!mddev->sync_thread) {
7314 printk(KERN_ERR "%s: could not start resync"
7317 /* leave the spares where they are, it shouldn't hurt */
7318 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7319 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7320 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
7321 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
7322 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
7324 md_wakeup_thread(mddev->sync_thread);
7325 sysfs_notify_dirent_safe(mddev->sysfs_action);
7326 md_new_event(mddev);
7329 if (!mddev->sync_thread) {
7330 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7331 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
7333 if (mddev->sysfs_action)
7334 sysfs_notify_dirent_safe(mddev->sysfs_action);
7336 mddev_unlock(mddev);
7340 void md_wait_for_blocked_rdev(mdk_rdev_t *rdev, mddev_t *mddev)
7342 sysfs_notify_dirent_safe(rdev->sysfs_state);
7343 wait_event_timeout(rdev->blocked_wait,
7344 !test_bit(Blocked, &rdev->flags),
7345 msecs_to_jiffies(5000));
7346 rdev_dec_pending(rdev, mddev);
7348 EXPORT_SYMBOL(md_wait_for_blocked_rdev);
7351 /* Bad block management.
7352 * We can record which blocks on each device are 'bad' and so just
7353 * fail those blocks, or that stripe, rather than the whole device.
7354 * Entries in the bad-block table are 64bits wide. This comprises:
7355 * Length of bad-range, in sectors: 0-511 for lengths 1-512
7356 * Start of bad-range, sector offset, 54 bits (allows 8 exbibytes)
7357 * A 'shift' can be set so that larger blocks are tracked and
7358 * consequently larger devices can be covered.
7359 * 'Acknowledged' flag - 1 bit. - the most significant bit.
7361 * Locking of the bad-block table uses a seqlock so md_is_badblock
7362 * might need to retry if it is very unlucky.
7363 * We will sometimes want to check for bad blocks in a bi_end_io function,
7364 * so we use the write_seqlock_irq variant.
7366 * When looking for a bad block we specify a range and want to
7367 * know if any block in the range is bad. So we binary-search
7368 * to the last range that starts at-or-before the given endpoint,
7369 * (or "before the sector after the target range")
7370 * then see if it ends after the given start.
7372 * 0 if there are no known bad blocks in the range
7373 * 1 if there are known bad block which are all acknowledged
7374 * -1 if there are bad blocks which have not yet been acknowledged in metadata.
7375 * plus the start/length of the first bad section we overlap.
7377 int md_is_badblock(struct badblocks *bb, sector_t s, int sectors,
7378 sector_t *first_bad, int *bad_sectors)
7384 sector_t target = s + sectors;
7387 if (bb->shift > 0) {
7388 /* round the start down, and the end up */
7390 target += (1<<bb->shift) - 1;
7391 target >>= bb->shift;
7392 sectors = target - s;
7394 /* 'target' is now the first block after the bad range */
7397 seq = read_seqbegin(&bb->lock);
7401 /* Binary search between lo and hi for 'target'
7402 * i.e. for the last range that starts before 'target'
7404 /* INVARIANT: ranges before 'lo' and at-or-after 'hi'
7405 * are known not to be the last range before target.
7406 * VARIANT: hi-lo is the number of possible
7407 * ranges, and decreases until it reaches 1
7409 while (hi - lo > 1) {
7410 int mid = (lo + hi) / 2;
7411 sector_t a = BB_OFFSET(p[mid]);
7413 /* This could still be the one, earlier ranges
7417 /* This and later ranges are definitely out. */
7420 /* 'lo' might be the last that started before target, but 'hi' isn't */
7422 /* need to check all range that end after 's' to see if
7423 * any are unacknowledged.
7426 BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) {
7427 if (BB_OFFSET(p[lo]) < target) {
7428 /* starts before the end, and finishes after
7429 * the start, so they must overlap
7431 if (rv != -1 && BB_ACK(p[lo]))
7435 *first_bad = BB_OFFSET(p[lo]);
7436 *bad_sectors = BB_LEN(p[lo]);
7442 if (read_seqretry(&bb->lock, seq))
7447 EXPORT_SYMBOL_GPL(md_is_badblock);
7450 * Add a range of bad blocks to the table.
7451 * This might extend the table, or might contract it
7452 * if two adjacent ranges can be merged.
7453 * We binary-search to find the 'insertion' point, then
7454 * decide how best to handle it.
7456 static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors,
7464 /* badblocks are disabled */
7468 /* round the start down, and the end up */
7469 sector_t next = s + sectors;
7471 next += (1<<bb->shift) - 1;
7476 write_seqlock_irq(&bb->lock);
7481 /* Find the last range that starts at-or-before 's' */
7482 while (hi - lo > 1) {
7483 int mid = (lo + hi) / 2;
7484 sector_t a = BB_OFFSET(p[mid]);
7490 if (hi > lo && BB_OFFSET(p[lo]) > s)
7494 /* we found a range that might merge with the start
7497 sector_t a = BB_OFFSET(p[lo]);
7498 sector_t e = a + BB_LEN(p[lo]);
7499 int ack = BB_ACK(p[lo]);
7501 /* Yes, we can merge with a previous range */
7502 if (s == a && s + sectors >= e)
7503 /* new range covers old */
7506 ack = ack && acknowledged;
7508 if (e < s + sectors)
7510 if (e - a <= BB_MAX_LEN) {
7511 p[lo] = BB_MAKE(a, e-a, ack);
7514 /* does not all fit in one range,
7515 * make p[lo] maximal
7517 if (BB_LEN(p[lo]) != BB_MAX_LEN)
7518 p[lo] = BB_MAKE(a, BB_MAX_LEN, ack);
7524 if (sectors && hi < bb->count) {
7525 /* 'hi' points to the first range that starts after 's'.
7526 * Maybe we can merge with the start of that range */
7527 sector_t a = BB_OFFSET(p[hi]);
7528 sector_t e = a + BB_LEN(p[hi]);
7529 int ack = BB_ACK(p[hi]);
7530 if (a <= s + sectors) {
7531 /* merging is possible */
7532 if (e <= s + sectors) {
7537 ack = ack && acknowledged;
7540 if (e - a <= BB_MAX_LEN) {
7541 p[hi] = BB_MAKE(a, e-a, ack);
7544 p[hi] = BB_MAKE(a, BB_MAX_LEN, ack);
7552 if (sectors == 0 && hi < bb->count) {
7553 /* we might be able to combine lo and hi */
7554 /* Note: 's' is at the end of 'lo' */
7555 sector_t a = BB_OFFSET(p[hi]);
7556 int lolen = BB_LEN(p[lo]);
7557 int hilen = BB_LEN(p[hi]);
7558 int newlen = lolen + hilen - (s - a);
7559 if (s >= a && newlen < BB_MAX_LEN) {
7560 /* yes, we can combine them */
7561 int ack = BB_ACK(p[lo]) && BB_ACK(p[hi]);
7562 p[lo] = BB_MAKE(BB_OFFSET(p[lo]), newlen, ack);
7563 memmove(p + hi, p + hi + 1,
7564 (bb->count - hi - 1) * 8);
7569 /* didn't merge (it all).
7570 * Need to add a range just before 'hi' */
7571 if (bb->count >= MD_MAX_BADBLOCKS) {
7572 /* No room for more */
7576 int this_sectors = sectors;
7577 memmove(p + hi + 1, p + hi,
7578 (bb->count - hi) * 8);
7581 if (this_sectors > BB_MAX_LEN)
7582 this_sectors = BB_MAX_LEN;
7583 p[hi] = BB_MAKE(s, this_sectors, acknowledged);
7584 sectors -= this_sectors;
7590 write_sequnlock_irq(&bb->lock);
7595 int rdev_set_badblocks(mdk_rdev_t *rdev, sector_t s, int sectors,
7598 int rv = md_set_badblocks(&rdev->badblocks,
7599 s + rdev->data_offset, sectors, acknowledged);
7601 /* Make sure they get written out promptly */
7602 set_bit(MD_CHANGE_CLEAN, &rdev->mddev->flags);
7603 md_wakeup_thread(rdev->mddev->thread);
7607 EXPORT_SYMBOL_GPL(rdev_set_badblocks);
7610 * Remove a range of bad blocks from the table.
7611 * This may involve extending the table if we spilt a region,
7612 * but it must not fail. So if the table becomes full, we just
7613 * drop the remove request.
7615 static int md_clear_badblocks(struct badblocks *bb, sector_t s, int sectors)
7619 sector_t target = s + sectors;
7622 if (bb->shift > 0) {
7623 /* When clearing we round the start up and the end down.
7624 * This should not matter as the shift should align with
7625 * the block size and no rounding should ever be needed.
7626 * However it is better the think a block is bad when it
7627 * isn't than to think a block is not bad when it is.
7629 s += (1<<bb->shift) - 1;
7631 target >>= bb->shift;
7632 sectors = target - s;
7635 write_seqlock_irq(&bb->lock);
7640 /* Find the last range that starts before 'target' */
7641 while (hi - lo > 1) {
7642 int mid = (lo + hi) / 2;
7643 sector_t a = BB_OFFSET(p[mid]);
7650 /* p[lo] is the last range that could overlap the
7651 * current range. Earlier ranges could also overlap,
7652 * but only this one can overlap the end of the range.
7654 if (BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > target) {
7655 /* Partial overlap, leave the tail of this range */
7656 int ack = BB_ACK(p[lo]);
7657 sector_t a = BB_OFFSET(p[lo]);
7658 sector_t end = a + BB_LEN(p[lo]);
7661 /* we need to split this range */
7662 if (bb->count >= MD_MAX_BADBLOCKS) {
7666 memmove(p+lo+1, p+lo, (bb->count - lo) * 8);
7668 p[lo] = BB_MAKE(a, s-a, ack);
7671 p[lo] = BB_MAKE(target, end - target, ack);
7672 /* there is no longer an overlap */
7677 BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) {
7678 /* This range does overlap */
7679 if (BB_OFFSET(p[lo]) < s) {
7680 /* Keep the early parts of this range. */
7681 int ack = BB_ACK(p[lo]);
7682 sector_t start = BB_OFFSET(p[lo]);
7683 p[lo] = BB_MAKE(start, s - start, ack);
7684 /* now low doesn't overlap, so.. */
7689 /* 'lo' is strictly before, 'hi' is strictly after,
7690 * anything between needs to be discarded
7693 memmove(p+lo+1, p+hi, (bb->count - hi) * 8);
7694 bb->count -= (hi - lo - 1);
7700 write_sequnlock_irq(&bb->lock);
7704 int rdev_clear_badblocks(mdk_rdev_t *rdev, sector_t s, int sectors)
7706 return md_clear_badblocks(&rdev->badblocks,
7707 s + rdev->data_offset,
7710 EXPORT_SYMBOL_GPL(rdev_clear_badblocks);
7713 * Acknowledge all bad blocks in a list.
7714 * This only succeeds if ->changed is clear. It is used by
7715 * in-kernel metadata updates
7717 void md_ack_all_badblocks(struct badblocks *bb)
7719 if (bb->page == NULL || bb->changed)
7720 /* no point even trying */
7722 write_seqlock_irq(&bb->lock);
7724 if (bb->changed == 0) {
7727 for (i = 0; i < bb->count ; i++) {
7728 if (!BB_ACK(p[i])) {
7729 sector_t start = BB_OFFSET(p[i]);
7730 int len = BB_LEN(p[i]);
7731 p[i] = BB_MAKE(start, len, 1);
7735 write_sequnlock_irq(&bb->lock);
7737 EXPORT_SYMBOL_GPL(md_ack_all_badblocks);
7739 static int md_notify_reboot(struct notifier_block *this,
7740 unsigned long code, void *x)
7742 struct list_head *tmp;
7745 if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) {
7747 printk(KERN_INFO "md: stopping all md devices.\n");
7749 for_each_mddev(mddev, tmp)
7750 if (mddev_trylock(mddev)) {
7751 /* Force a switch to readonly even array
7752 * appears to still be in use. Hence
7755 md_set_readonly(mddev, 100);
7756 mddev_unlock(mddev);
7759 * certain more exotic SCSI devices are known to be
7760 * volatile wrt too early system reboots. While the
7761 * right place to handle this issue is the given
7762 * driver, we do want to have a safe RAID driver ...
7769 static struct notifier_block md_notifier = {
7770 .notifier_call = md_notify_reboot,
7772 .priority = INT_MAX, /* before any real devices */
7775 static void md_geninit(void)
7777 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
7779 proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops);
7782 static int __init md_init(void)
7786 md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0);
7790 md_misc_wq = alloc_workqueue("md_misc", 0, 0);
7794 if ((ret = register_blkdev(MD_MAJOR, "md")) < 0)
7797 if ((ret = register_blkdev(0, "mdp")) < 0)
7801 blk_register_region(MKDEV(MD_MAJOR, 0), 1UL<<MINORBITS, THIS_MODULE,
7802 md_probe, NULL, NULL);
7803 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
7804 md_probe, NULL, NULL);
7806 register_reboot_notifier(&md_notifier);
7807 raid_table_header = register_sysctl_table(raid_root_table);
7813 unregister_blkdev(MD_MAJOR, "md");
7815 destroy_workqueue(md_misc_wq);
7817 destroy_workqueue(md_wq);
7825 * Searches all registered partitions for autorun RAID arrays
7829 static LIST_HEAD(all_detected_devices);
7830 struct detected_devices_node {
7831 struct list_head list;
7835 void md_autodetect_dev(dev_t dev)
7837 struct detected_devices_node *node_detected_dev;
7839 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
7840 if (node_detected_dev) {
7841 node_detected_dev->dev = dev;
7842 list_add_tail(&node_detected_dev->list, &all_detected_devices);
7844 printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed"
7845 ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev));
7850 static void autostart_arrays(int part)
7853 struct detected_devices_node *node_detected_dev;
7855 int i_scanned, i_passed;
7860 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
7862 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
7864 node_detected_dev = list_entry(all_detected_devices.next,
7865 struct detected_devices_node, list);
7866 list_del(&node_detected_dev->list);
7867 dev = node_detected_dev->dev;
7868 kfree(node_detected_dev);
7869 rdev = md_import_device(dev,0, 90);
7873 if (test_bit(Faulty, &rdev->flags)) {
7877 set_bit(AutoDetected, &rdev->flags);
7878 list_add(&rdev->same_set, &pending_raid_disks);
7882 printk(KERN_INFO "md: Scanned %d and added %d devices.\n",
7883 i_scanned, i_passed);
7885 autorun_devices(part);
7888 #endif /* !MODULE */
7890 static __exit void md_exit(void)
7893 struct list_head *tmp;
7895 blk_unregister_region(MKDEV(MD_MAJOR,0), 1U << MINORBITS);
7896 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
7898 unregister_blkdev(MD_MAJOR,"md");
7899 unregister_blkdev(mdp_major, "mdp");
7900 unregister_reboot_notifier(&md_notifier);
7901 unregister_sysctl_table(raid_table_header);
7902 remove_proc_entry("mdstat", NULL);
7903 for_each_mddev(mddev, tmp) {
7904 export_array(mddev);
7905 mddev->hold_active = 0;
7907 destroy_workqueue(md_misc_wq);
7908 destroy_workqueue(md_wq);
7911 subsys_initcall(md_init);
7912 module_exit(md_exit)
7914 static int get_ro(char *buffer, struct kernel_param *kp)
7916 return sprintf(buffer, "%d", start_readonly);
7918 static int set_ro(const char *val, struct kernel_param *kp)
7921 int num = simple_strtoul(val, &e, 10);
7922 if (*val && (*e == '\0' || *e == '\n')) {
7923 start_readonly = num;
7929 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
7930 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
7932 module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR);
7934 EXPORT_SYMBOL(register_md_personality);
7935 EXPORT_SYMBOL(unregister_md_personality);
7936 EXPORT_SYMBOL(md_error);
7937 EXPORT_SYMBOL(md_done_sync);
7938 EXPORT_SYMBOL(md_write_start);
7939 EXPORT_SYMBOL(md_write_end);
7940 EXPORT_SYMBOL(md_register_thread);
7941 EXPORT_SYMBOL(md_unregister_thread);
7942 EXPORT_SYMBOL(md_wakeup_thread);
7943 EXPORT_SYMBOL(md_check_recovery);
7944 MODULE_LICENSE("GPL");
7945 MODULE_DESCRIPTION("MD RAID framework");
7947 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);