ceph: no .snap inside of snapped namespace

Otherwise you can do things like

# mkdir .snap/foo
# cd .snap/foo/.snap
# ls
<badness>

Signed-off-by: Sage Weil <sage@newdream.net>

1 files changed, 1 insertions, 0 deletions

diff --git a/fs/ceph/dir.c b/fs/ceph/dir.c
index 196fd4c62db7..099a58615b90 100644
--- a/fs/ceph/dir.c
+++ b/fs/ceph/dir.c
@@ -496,6 +496,7 @@ struct dentry *ceph_finish_lookup(struct ceph_mds_request *req,
 
         /* .snap dir? */
         if (err == -ENOENT &&
+            ceph_snap(parent) == CEPH_NOSNAP &&
             strcmp(dentry->d_name.name,
                    fsc->mount_options->snapdir_name) == 0) {
                 struct inode *inode = ceph_get_snapdir(parent);