From: Al Viro <viro@zeniv.linux.org.uk>
Date: Wed, 13 Jul 2011 01:42:24 +0000 (-0400)
Subject: fix loop checks in d_materialise_unique()
X-Git-Tag: v3.0~33^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1836750115f20b774e55c032a3893e8c5bdf41ed;p=pandora-kernel.git

fix loop checks in d_materialise_unique()

Both __d_unalias() and __d_materialise_dentry() need loop prevention.
Grab rename_lock in caller, check for loops there...

As a side benefit, we have dentry_lock_for_move() called only under
rename_lock, which seriously reduces deadlock potential of the
execrable "locking order" used for ->d_lock.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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