tree dd8f6896941a030b723fedbaff6e64e3073ba6fc
parent 84c3d55cc474f9c234c023c92e2769f940d5548c
author Al Viro <viro@zeniv.linux.org.uk> 1396551918 -0400
committer Al Viro <viro@zeniv.linux.org.uk> 1399412382 -0400

new helper: copy_page_from_iter()

parallel to copy_page_to_iter().  pipe_write() switched to it (and became
->write_iter()).

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