From: Eric W. Biederman <ebiederm@xmission.com>
Date: Sun, 10 May 2015 03:09:14 +0000 (-0500)
Subject: sysctl: Allow creating permanently empty directories that serve as mountpoints.
X-Git-Tag: omap-for-v4.2/fixes-rc1^2~19^2~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f9bd6733d3f11e24f3949becf277507d422ee1eb;p=pandora-kernel.git

sysctl: Allow creating permanently empty directories that serve as mountpoints.

Add a magic sysctl table sysctl_mount_point that when used to
create a directory forces that directory to be permanently empty.

Update the code to use make_empty_dir_inode when accessing permanently
empty directories.

Update the code to not allow adding to permanently empty directories.

Update /proc/sys/fs/binfmt_misc to be a permanently empty directory.

Cc: stable@vger.kernel.org
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
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