ceph: handle splice_dentry/d_materialize_unique error in readdir_prepopulate

Handle a splice_dentry failure (due to a d_materialize_unique error)
without crashing.  (Also, report the error code.)

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

diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c
index ab47f46ca28285b179f4e307375a88555c17ef21..8f9b9fe8ef9f4a84056c16289650d482a8c0c8ff 100644 (file)
--- a/fs/ceph/inode.c
+++ b/fs/ceph/inode.c
@@ -854,8 +854,8 @@ static struct dentry *splice_dentry(struct dentry *dn, struct inode *in,
                d_drop(dn);
        realdn = d_materialise_unique(dn, in);
        if (IS_ERR(realdn)) {
-               pr_err("splice_dentry error %p inode %p ino %llx.%llx\n",
-                      dn, in, ceph_vinop(in));
+               pr_err("splice_dentry error %ld %p inode %p ino %llx.%llx\n",
+                      PTR_ERR(realdn), dn, in, ceph_vinop(in));
                if (prehash)
                        *prehash = false; /* don't rehash on error */
                dn = realdn; /* note realdn contains the error */
@@ -1234,18 +1234,23 @@ retry_lookup:
                                goto out;
                        }
                        dn = splice_dentry(dn, in, NULL);
+                       if (IS_ERR(dn))
+                               dn = NULL;
                }
 
                if (fill_inode(in, &rinfo->dir_in[i], NULL, session,
                               req->r_request_started, -1,
                               &req->r_caps_reservation) < 0) {
                        pr_err("fill_inode badness on %p\n", in);
-                       dput(dn);
-                       continue;
+                       goto next_item;
                }
-               update_dentry_lease(dn, rinfo->dir_dlease[i],
-                                   req->r_session, req->r_request_started);
-               dput(dn);
+               if (dn)
+                       update_dentry_lease(dn, rinfo->dir_dlease[i],
+                                           req->r_session,
+                                           req->r_request_started);
+next_item:
+               if (dn)
+                       dput(dn);
        }
        req->r_did_prepopulate = true;