From 7e936b737211e6b54e34b71a827e56b872e958d8 Mon Sep 17 00:00:00 2001
From: Andreas Dilger <adilger@dilger.ca>
Date: Mon, 28 May 2012 17:02:25 -0400
Subject: [PATCH] ext4: disallow hard-linked directory in ext4_lookup

A hard-linked directory to its parent can cause the VFS to deadlock,
and is a sign of a corrupted file system.  So detect this case in
ext4_lookup(), before the rmdir() lockup scenario can take place.

Signed-off-by: Andreas Dilger <adilger@dilger.ca>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Cc: stable@kernel.org
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