From: NeilBrown <neilb@cse.unsw.edu.au> 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> --- drivers/md/linear.c | 5 ++--- 1 files changed, 2 insertions(+), 3 deletions(-) diff -puN drivers/md/linear.c~md-fix-splitting-of-md-linear-request-that-cross-a-device-boundary drivers/md/linear.c --- 25/drivers/md/linear.c~md-fix-splitting-of-md-linear-request-that-cross-a-device-boundary 2005-05-09 22:30:09.000000000 -0700 +++ 25-akpm/drivers/md/linear.c 2005-05-09 22:30:09.000000000 -0700 @@ -269,9 +269,8 @@ static int linear_make_request (request_ * 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)) _