From 283e7e5d249f4861c797679b6a5b53d525194c98 Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Fri, 3 Apr 2015 15:21:59 -0400
Subject: [PATCH] switch /dev/loop to vfs_iter_write()

all writable files that might be used as backing store for /dev/loop
already support ->write_iter()

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