io_kbuf_commit
if (!io_kbuf_commit(req, sel.buf_list, *len, 1))
if (!io_kbuf_commit(req, sel->buf_list, arg->out_len, ret))
ret = io_kbuf_commit(req, bl, len, nr);
bool io_kbuf_commit(struct io_kiocb *req,
io_kbuf_commit(req, bl, len, io_bundle_nbufs(kmsg, len));