Take hash recalculation into do_lookup()

Both callers of do_lookup() do the same thing before it
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

fs/namei.c

@@ -767,8 +767,18 @@ static int do_lookup(struct nameidata *nd, struct qstr *name,
 		     struct path *path)
 {
 	struct vfsmount *mnt = nd->path.mnt;
-	struct dentry *dentry = __d_lookup(nd->path.dentry, name);
+	struct dentry *dentry;
+	/*
+	 * See if the low-level filesystem might want
+	 * to use its own hash..
+	 */
+	if (nd->path.dentry->d_op && nd->path.dentry->d_op->d_hash) {
+		int err = nd->path.dentry->d_op->d_hash(nd->path.dentry, name);
+		if (err < 0)
+			return err;
+	}
 
+	dentry = __d_lookup(nd->path.dentry, name);
 	if (!dentry)
 		goto need_lookup;
 	if (dentry->d_op && dentry->d_op->d_revalidate)
@@ -868,16 +878,6 @@ static int link_path_walk(const char *name, struct nameidata *nd)
 			case 1:
 				continue;
 		}
-		/*
-		 * See if the low-level filesystem might want
-		 * to use its own hash..
-		 */
-		if (nd->path.dentry->d_op && nd->path.dentry->d_op->d_hash) {
-			err = nd->path.dentry->d_op->d_hash(nd->path.dentry,
-							    &this);
-			if (err < 0)
-				break;
-		}
 		/* This does the actual lookups.. */
 		err = do_lookup(nd, &this, &next);
 		if (err)
@@ -923,12 +923,6 @@ last_component:
 			case 1:
 				goto return_reval;
 		}
-		if (nd->path.dentry->d_op && nd->path.dentry->d_op->d_hash) {
-			err = nd->path.dentry->d_op->d_hash(nd->path.dentry,
-							    &this);
-			if (err < 0)
-				break;
-		}
 		err = do_lookup(nd, &this, &next);
 		if (err)
 			break;