[PATCH] md: fix splitting of md/linear request that cross a device boundary
When a request crosses a boundary between devices, it needs to be split.
But where we should calculate the amount of the request before the boundary
to find the split-point, we care currently calculating the amount that is
*after* the boundary !!!
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>
diff --git a/drivers/md/linear.c b/drivers/md/linear.c
index 161e9aa..b1941b8 100644
--- a/drivers/md/linear.c
+++ b/drivers/md/linear.c
@@ -269,9 +269,8 @@
* split it.
*/
struct bio_pair *bp;
- bp = bio_split(bio, bio_split_pool,
- (bio->bi_sector + (bio->bi_size >> 9) -
- (tmp_dev->offset + tmp_dev->size))<<1);
+ bp = bio_split(bio, bio_split_pool,
+ ((tmp_dev->offset + tmp_dev->size)<<1) - bio->bi_sector);
if (linear_make_request(q, &bp->bio1))
generic_make_request(&bp->bio1);
if (linear_make_request(q, &bp->bio2))