From: Sage Weil <sage@newdream.net>
Date: Tue, 26 Jul 2011 18:30:15 +0000 (-0700)
Subject: ceph: handle racing calls to ceph_init_dentry
X-Git-Tag: v3.1-rc1~220^2~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=48d0cbd1242aac969560ef8b90f26ee3b09a6a5c;p=pandora-kernel.git

ceph: handle racing calls to ceph_init_dentry

The ->lookup() and prepopulate_readdir() callers are working with unhashed
dentries, so we don't have to worry.  The export.c callers, though, need
to initialize something they got back from d_obtain_alias() and are
potentially racing with other callers.  Make sure we don't return unless
the dentry is properly initialized (by us or someone else).

Reported-by: Al Viro <viro@ZenIV.linux.org.uk>
Reviewed-by: Yehuda Sadeh <yehuda@hq.newdream.net>
Signed-off-by: Sage Weil <sage@newdream.net>
---

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