From: J. Bruce Fields <bfields@redhat.com>
Date: Mon, 17 Feb 2014 22:45:56 +0000 (-0500)
Subject: dcache: close d_move race in d_splice_alias
X-Git-Tag: cleanup-for-v3.18~46^2~11
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=75a2352d0110960aeee1a28ddc09a55f97c99100;p=pandora-kernel.git

dcache: close d_move race in d_splice_alias

d_splice_alias will d_move an IS_ROOT() directory dentry into place if
one exists.  This should be safe as long as the dentry remains IS_ROOT,
but I can't see what guarantees that: once we drop the i_lock all we
hold here is the i_mutex on an unrelated parent directory.

Instead copy the logic of d_materialise_unique.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---

Reading git-diff-tree failed