rem: rootfs_read(fs_cookie _fs, fs_vnode _v, file_cookie _cookie, void *buf, off_t pos, size_t *len)
add: rootfs_read(fs_cookie _fs, fs_vnode _v, file_cookie _cookie, off_t pos, void *buf, size_t *len)
context: rootfs_read(fs_cookie _fs, fs_vnode _v, file_cookie _cookie, void *buf, off_t pos, size_t *len){	return EINVAL;}