ceph: protect access to d_parent

d_parent is protected by d_lock: use it when looking up a dentry's parent
directory inode.  Also take a reference and drop it in the caller to avoid
a use-after-free.

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>

diff --cc fs/ceph/dir.c
Simple merge

diff --cc fs/ceph/file.c
Simple merge

diff --cc fs/ceph/inode.c
Simple merge

diff --cc fs/ceph/ioctl.c
Simple merge

diff --cc fs/ceph/super.h
Simple merge

diff --cc fs/ceph/xattr.c
Simple merge