Please backport: vfs: deny copy_file_range() for non regular files

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Subject: Please backport: vfs: deny copy_file_range() for non regular files
From: "Theodore Ts'o" <tytso@xxxxxxx>
Date: Sat, 7 Oct 2017 21:19:33 -0400
User-agent: NeoMutt/20170609 (1.8.3)

Hi, please cherry pick the following upstream commit:

   11cbfb10775a: vfs: deny copy_file_range() for non regular files

to 3.18, 4.1, 4.4, and 4.9 LTS stable kernels.

It is needed to fix the following xfstests failure: generic/434

Many thanks,

					- Ted

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