diff -uNrp samba-3.2.6.org/source/smbd/vfs.c samba-3.2.6/source/smbd/vfs.c
--- samba-3.2.6.org/source/smbd/vfs.c	2008-12-10 20:12:23.000000000 +0900
+++ samba-3.2.6/source/smbd/vfs.c	2008-12-22 13:54:54.000000000 +0900
@@ -575,6 +575,20 @@ int vfs_allocate_file_space(files_struct
 int vfs_set_filelen(files_struct *fsp, SMB_OFF_T len)
 {
 	int ret;
+	connection_struct *conn = fsp->conn;
+	SMB_BIG_UINT space_avail;
+	SMB_BIG_UINT bsize,dfree,dsize;
+	
+	/* available disk space is enough or not? */
+	if (lp_strict_allocate(SNUM(fsp->conn))){
+		space_avail = get_dfree_info(conn,fsp->fsp_name,False,&bsize,&dfree,&dsize);
+                /* space_avail is 1k blocks */
+		if (space_avail == (SMB_BIG_UINT)-1 ||
+		    ((SMB_BIG_UINT)len/1024 > space_avail) ) {
+			errno = ENOSPC;
+			return -1;
+		}
+	}
 
 	release_level_2_oplocks_on_change(fsp);
 	DEBUG(10,("vfs_set_filelen: ftruncate %s to len %.0f\n", fsp->fsp_name, (double)len));