UBUNTU: SAUCE: apparmor: fix sleep from invalid context

UBUNTU: SAUCE: apparmor: fix sleep from invalid context

This is a patch to an apparmor feature that is not currently upstream

BugLink: http://bugs.launchpad.net/bugs/1539349
Commit 08518549722f0c992a9e4be71a0777f37147e9d2 made it so kern_path() via
getname_kernel() may do a GFP_KERNEL based allocation which is causing the
"sleep from invalid context" lockdep warning. Rework The apparmor mount
code to move kern_path() calls outside of the get_buffers()/put_buffers()
RCU read_lock block.

Signed-off-by: John Johansen <john.johansen@canonical.com>
Signed-off-by: Andy Whitcroft <apw@canonical.com>
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>