tree 8c911f14f9c22808b0f52827e562d2ff3d6dedf9
parent 08895a8b6b06ed2323cd97a36ee40a116b3db8ed
author Al Viro <viro@zeniv.linux.org.uk> 1475541535 -0400
committer Al Viro <viro@zeniv.linux.org.uk> 1475541535 -0400

consistent treatment of EFAULT on O_DIRECT read/write

Make local filesystems treat a fault as shortened IO,
returning -EFAULT only if nothing had been transferred.
That's how everything else (NFS, FUSE, ceph, Lustre)
behaves.

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