From 1b71fe2efa31cd18c865db474a4cd473b6ab5281 Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Sat, 16 Jul 2011 23:43:58 -0400
Subject: [PATCH] ceph analog of cifs build_path_from_dentry() race fix

... unfortunately, cifs bug got copied.  Fix is essentially the same.

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