ceph: do not assume r_old_dentry[_dir] always set together

Do not assume that r_old_dentry implies that r_old_dentry_dir is also
true.  Separate out the ref cleanup and make the debugs dump behave when
it is NULL.

Signed-off-by: Sage Weil <sage@inktank.com>
Reviewed-by: Yan, Zheng <zheng.z.yan@intel.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/fs/ceph/debugfs.c b/fs/ceph/debugfs.c
index 6d59006bfa27..8c6f313db3ea 100644
--- a/fs/ceph/debugfs.c
+++ b/fs/ceph/debugfs.c
@@ -102,7 +102,8 @@ static int mdsc_show(struct seq_file *s, void *p)
                                 path = NULL;
                         spin_lock(&req->r_old_dentry->d_lock);
                         seq_printf(s, " #%llx/%.*s (%s)",
-                           ceph_ino(req->r_old_dentry_dir),
+                                   req->r_old_dentry_dir ?
+                                   ceph_ino(req->r_old_dentry_dir) : 0,
                                    req->r_old_dentry->d_name.len,
                                    req->r_old_dentry->d_name.name,
                                    path ? path : "");