ceph: add a bit more info when BUG'ing due to parent changing

Signed-off-by: Jeff Layton <jlayton@redhat.com>

diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c
index ef4d046473256009843b6b4c82e1b5b1e451b02d..89b01fa537fc5ac76e7fa3514850b2633bf48cfe 100644 (file)
--- a/fs/ceph/inode.c
+++ b/fs/ceph/inode.c
@@ -1260,13 +1260,20 @@ retry_lookup:
                 * mknod symlink mkdir  : null -> new inode
                 * unlink               : linked -> null
                 */
-               struct inode *dir = req->r_locked_dir;
+               struct inode *parent, *dir = req->r_locked_dir;
                struct dentry *dn = req->r_dentry;
                bool have_dir_cap, have_lease;
 
                BUG_ON(!dn);
                BUG_ON(!dir);
-               BUG_ON(d_inode(dn->d_parent) != dir);
+               parent = d_inode(dn->d_parent);
+
+               if (unlikely(parent != dir)) {
+                       pr_err("%s: dir=%p parent=%p op=%d\n", __func__, dir,
+                                       parent, req->r_op);
+                       BUG();
+               }
+
                BUG_ON(ceph_ino(dir) !=
                       le64_to_cpu(rinfo->diri.in->ino));
                BUG_ON(ceph_snap(dir) !=