tree 9a9486ef6d962e7a5d7b97d5e60cd490554d1980
parent c02ed2e75ef4c74e41e421acb4ef1494671585e8
author Al Viro <viro@zeniv.linux.org.uk> 1487374944 -0500
committer Al Viro <viro@zeniv.linux.org.uk> 1491149447 -0400

[iov_iter] new privimitive: iov_iter_revert()

opposite to iov_iter_advance(); the caller is responsible for never
using it to move back past the initial position.

Cc: stable@vger.kernel.org
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>