p9_parse_header
int p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type,
EXPORT_SYMBOL(p9_parse_header);
err = p9_parse_header(&req->rc, NULL, &type, NULL, 0);
err = p9_parse_header(&oldreq->tc, NULL, NULL, &oldtag, 1);
err = p9_parse_header(&m->rc, &m->rc.size, NULL, NULL, 0);
err = p9_parse_header(&c->rc, NULL, NULL, &tag, 1);
ret = p9_parse_header(&rc, &rc.size, NULL, NULL, 0);