tree 3ab5b1ab589c02756211c8faa098f756488ff0de
parent 23c560a99d78bddf5c251bfa97bce19e4da4b3f3
author Tejun Heo <tj@kernel.org> 1239801024 +0900
committer Jens Axboe <jens.axboe@oracle.com> 1240382109 +0200

block: fix SG_IO vector request data length handling

Impact: fix SG_IO behavior such that it matches the documentation

SG_IO howto says that if ->dxfer_len and sum of iovec disagress, the
shorter one wins.  However, the current implementation returns -EINVAL
for such cases.  Trim iovc if it's longer than ->dxfer_len.

This patch uses iov_*() helpers which take struct iovec * by casting
struct sg_iovec * to it.  sg_iovec is always identical to iovec and
this will be further cleaned up with later patches.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>