From 28060d5d9b261da110afe48aae7a2aa6555f798f Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Sat, 22 Mar 2014 05:15:17 -0400
Subject: [PATCH] btrfs: switch check_direct_IO() to iov_iter

... and don't open-code iov_iter_alignment() there

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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Reading git-format-patch failed