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| author | NeilBrown <neilb@suse.de> | 2008-05-23 13:04:32 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-05-24 09:56:09 -0700 |
| commit | 84255d1018c50e72c71a49f359989597d53a3f53 (patch) | |
| tree | 242c639d1e110f241e802e6b0a27a670deb8b174 | |
| parent | 80119ef5c8153e0a6cc5edf00c083dc98a9bd348 (diff) | |
| download | blackbird-op-linux-84255d1018c50e72c71a49f359989597d53a3f53.tar.gz blackbird-op-linux-84255d1018c50e72c71a49f359989597d53a3f53.zip | |
md: fix possible oops when removing a bitmap from an active array
It is possible to add a write-intent bitmap to an active array, or remove
the bitmap that is there.
When we do with the 'quiesce' the array, which causes make_request to
block in "wait_barrier()".
However we are sampling the value of "mddev->bitmap" before the
wait_barrier call, and using it afterwards. This can result in using a
bitmap structure that has been freed.
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | drivers/md/raid1.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c index ac409b7d83f5..21629ae46682 100644 --- a/drivers/md/raid1.c +++ b/drivers/md/raid1.c @@ -773,7 +773,7 @@ static int make_request(struct request_queue *q, struct bio * bio) r1bio_t *r1_bio; struct bio *read_bio; int i, targets = 0, disks; - struct bitmap *bitmap = mddev->bitmap; + struct bitmap *bitmap; unsigned long flags; struct bio_list bl; struct page **behind_pages = NULL; @@ -802,6 +802,8 @@ static int make_request(struct request_queue *q, struct bio * bio) wait_barrier(conf); + bitmap = mddev->bitmap; + disk_stat_inc(mddev->gendisk, ios[rw]); disk_stat_add(mddev->gendisk, sectors[rw], bio_sectors(bio)); |
