Ignore the return values to fsyncdir to ensure (for example) dpkg(1) can "flush" /var/lib/dpkg.

disorderfs.cpp

@@ -477,7 +477,8 @@ int	main (int argc, char** argv)
 	};
 	disorderfs_fuse_operations.fsyncdir = [] (const char* path, int is_datasync, struct fuse_file_info* info) -> int {
 		// XXX: is it OK to just use fsync?  Not clear on why FUSE has a separate fsyncdir operation
-		return wrap(is_datasync ? fdatasync(info->fh) : fsync(info->fh));
+		wrap(is_datasync ? fdatasync(info->fh) : fsync(info->fh));
+		return 0; // return value is ignored
 	};
 	disorderfs_fuse_operations.create = [] (const char* path, mode_t mode, struct fuse_file_info* info) -> int {
 		Guard g;