xfs_read
{"xfs", xfs_mount, xfs_read, xfs_dir, 0, 0},
int xfs_read (char *buf, int len);
xfs_read (dirbuf, 4);
xfs_read ((char *)dirbuf + 4, 5);
xfs_read (dirbuf, toread);
xfs_read (dirbuf, sizeof(xfs_dir2_data_hdr_t));
xfs_read (dirbuf, sizeof(*tail));
n = xfs_read (linkbuf, filemax);