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[PATCH] md: make sure md bitmap updates are flushed when array is stopped.

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The recent change to never ignore the bitmap, revealed that the bitmap isn't
begin flushed properly when an array is stopped.

We call bitmap_daemon_work three times as there is a three-stage pipeline for
flushing updates to the bitmap file.

Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
NeilBrown 2005-08-04 12:53:35 -07:00 committed by Linus Torvalds
parent e3b9703e27
commit 6b8b3e8a8b
3 changed files with 26 additions and 0 deletions
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23
drivers/md/bitmap.c
View file

@ -1450,6 +1450,29 @@ static void bitmap_set_memory_bits(struct bitmap *bitmap, sector_t offset)
}
/*
* flush out any pending updates
*/
void bitmap_flush(mddev_t *mddev)
{
struct bitmap *bitmap = mddev->bitmap;
int sleep;
if (!bitmap) /* there was no bitmap */
return;
/* run the daemon_work three time to ensure everything is flushed
* that can be
*/
sleep = bitmap->daemon_sleep;
bitmap->daemon_sleep = 0;
bitmap_daemon_work(bitmap);
bitmap_daemon_work(bitmap);
bitmap_daemon_work(bitmap);
bitmap->daemon_sleep = sleep;
bitmap_update_sb(bitmap);
}
/*
* free memory that was allocated
*/

2
drivers/md/md.c
View file

@ -1798,6 +1798,8 @@ static int do_md_stop(mddev_t * mddev, int ro)
goto out;
mddev->ro = 1;
} else {
bitmap_flush(mddev);
wait_event(mddev->sb_wait, atomic_read(&mddev->pending_writes)==0);
if (mddev->ro)
set_disk_ro(disk, 0);
blk_queue_make_request(mddev->queue, md_fail_request);

1
include/linux/raid/bitmap.h
View file

@ -248,6 +248,7 @@ struct bitmap {
/* these are used only by md/bitmap */
int bitmap_create(mddev_t *mddev);
void bitmap_flush(mddev_t *mddev);
void bitmap_destroy(mddev_t *mddev);
int bitmap_active(struct bitmap *bitmap);