tree 79d33823e26cb5be0af93bae37b2abca3fdaa5dc
parent fbabfd0f4ee2e8847bf56edf481249ad1bb8c44d
author Eric W. Biederman <ebiederm@xmission.com> 1431227354 -0500
committer Eric W. Biederman <ebiederm@xmission.com> 1435764999 -0500

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>