server: Support opening file objects from any root, not only directories.

server/fd.c

@@ -2393,27 +2393,13 @@ DECL_HANDLER(flush)
 DECL_HANDLER(open_file_object)
 {
     struct unicode_str name = get_req_unicode_str();
-    struct directory *root = NULL;
-    struct object *obj, *result;
+    struct object *obj, *result, *root = NULL;
 
-    if (req->rootdir && !(root = get_directory_obj( current->process, req->rootdir, 0 )))
-    {
-        if (get_error() != STATUS_OBJECT_TYPE_MISMATCH) return;
-        if (!(obj = (struct object *)get_file_obj( current->process, req->rootdir, 0 ))) return;
-        if (name.len)
-        {
-            release_object( obj );
-            set_error( STATUS_OBJECT_PATH_NOT_FOUND );
-            return;
-        }
-        clear_error();
-    }
-    else
-    {
-        obj = open_object_dir( root, &name, req->attributes, NULL );
-        if (root) release_object( root );
-        if (!obj) return;
-    }
+    if (req->rootdir && !(root = get_handle_obj( current->process, req->rootdir, 0, NULL ))) return;
+
+    obj = open_named_object( root, NULL, &name, req->attributes );
+    if (root) release_object( root );
+    if (!obj) return;
 
     if ((result = obj->ops->open_file( obj, req->access, req->sharing, req->options )))
     {

server/file.c

@@ -68,6 +68,7 @@ static struct object_type *file_get_type( struct object *obj );
 static struct fd *file_get_fd( struct object *obj );
 static struct security_descriptor *file_get_sd( struct object *obj );
 static int file_set_sd( struct object *obj, const struct security_descriptor *sd, unsigned int set_info );
+static struct object *file_lookup_name( struct object *obj, struct unicode_str *name, unsigned int attr );
 static struct object *file_open_file( struct object *obj, unsigned int access,
                                       unsigned int sharing, unsigned int options );
 static void file_destroy( struct object *obj );
@@ -90,7 +91,7 @@ static const struct object_ops file_ops =
     default_fd_map_access,        /* map_access */
     file_get_sd,                  /* get_sd */
     file_set_sd,                  /* set_sd */
-    no_lookup_name,               /* lookup_name */
+    file_lookup_name,             /* lookup_name */
     no_link_name,                 /* link_name */
     NULL,                         /* unlink_name */
     file_open_file,               /* open_file */
@@ -609,6 +610,14 @@ static int file_set_sd( struct object *obj, const struct security_descriptor *sd
     return 1;
 }
 
+static struct object *file_lookup_name( struct object *obj, struct unicode_str *name, unsigned int attr )
+{
+    if (!name || !name->len) return NULL;  /* open the file itself */
+
+    set_error( STATUS_OBJECT_PATH_NOT_FOUND );
+    return NULL;
+}
+
 static struct object *file_open_file( struct object *obj, unsigned int access,
                                       unsigned int sharing, unsigned int options )
 {