--- a/doc/fuse_db.sql	Tue Oct 21 21:54:20 2008 +0300
+++ b/doc/fuse_db.sql	Wed Oct 22 18:14:24 2008 +0300
@@ -16,17 +16,22 @@
 CREATE TABLE file_tree (
     "offset" serial4 primary key, 
     name varchar(256), 
-    ino int4 references inodes(ino) NOT NULL UNIQUE,
-    parent int4 references file_tree(ino)
+    ino int4 references inodes(ino) NOT NULL,
+    ino_dir int4 references inodes(ino),
+    parent int4,
+
+    CONSTRAINT file_tree_uniq_direntry UNIQUE (parent, name),
+    CONSTRAINT file_tree_uniq_dir_ino UNIQUE (ino_dir),
+    CONSTRAINT file_tree_exist_parent FOREIGN KEY (parent) REFERENCES file_tree(ino_dir)
 );
 
 INSERT INTO inodes (ino, type, mode, data) VALUES 
     (1, 'DIR', 365, NULL),
     (2, 'REG', 292, lo_create(0));
 
-INSERT INTO file_tree (name, parent, ino) VALUES 
-    (NULL,  NULL,   1   ),
-    ('foo', 1,      2   );
+INSERT INTO file_tree (name, parent, ino, ino_dir) VALUES 
+    (NULL,  NULL,   1,  1       ),
+    ('foo', 1,      2,  NULL    );
 
 CREATE OR REPLACE FUNCTION lo_size (oid) RETURNS int4 LANGUAGE SQL STABLE RETURNS NULL ON NULL INPUT AS 'select lo_lseek(lo_open($1, 262144), 0, 2);';
 CREATE OR REPLACE FUNCTION lo_pread (IN fd int4, IN len int4, IN "off" int4) RETURNS bytea LANGUAGE SQL STRICT AS 'select lo_lseek($1, $3, 0); select loread($1, $2);';
@@ -40,3 +45,12 @@
         ELSE 0 
     END;
 $$;
+
+CREATE OR REPLACE FUNCTION dbfs_link (
+    IN ino int4, IN new_parent int4, IN new_name varchar, 
+    OUT ino int4, OUT type char(3), OUT mode int2, OUT size int4, OUT nlink int8
+) LANGUAGE SQL VOLATILE AS $$
+    INSERT INTO file_tree (name, ino, parent) VALUES ($3, $1, $2);
+    SELECT ino, type, mode, dbfs_size(type, data, link_path) AS size, (SELECT COUNT(*) FROM inodes i LEFT JOIN file_tree ft ON (i.ino = ft.ino) WHERE i.ino = inodes.ino) AS nlink
+     FROM inodes WHERE ino = $1;
+$$;