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Commit 4c8e5537 authored by Trond Myklebust's avatar Trond Myklebust Committed by J. Bruce Fields
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SUNRPC: Simplify TCP receive code 



Use the fact that the iov iterators already have functionality for
skipping a base offset.

Signed-off-by: default avatarTrond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: default avatarJ. Bruce Fields <bfields@redhat.com>
parent 1863d77f

net/sunrpc/svcsock.c

+14 −39
Original line number Diff line number Diff line
@@ -325,59 +325,34 @@ static int svc_one_sock_name(struct svc_sock *svsk, char *buf, int remaining) 
/*

 * Generic recvfrom routine.

 */

static int svc_recvfrom(struct svc_rqst *rqstp, struct kvec *iov, int nr,

			int buflen)

static ssize_t svc_recvfrom(struct svc_rqst *rqstp, struct kvec *iov,

			    unsigned int nr, size_t buflen, unsigned int base)

{

	struct svc_sock *svsk =

		container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);

	struct msghdr msg = {

		.msg_flags	= MSG_DONTWAIT,

	};

	int len;

	struct msghdr msg = { NULL };

	ssize_t len;



	rqstp->rq_xprt_hlen = 0;



	clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);

	iov_iter_kvec(&msg.msg_iter, READ | ITER_KVEC, iov, nr, buflen);

	len = sock_recvmsg(svsk->sk_sock, &msg, msg.msg_flags);

	if (base != 0) {

		iov_iter_advance(&msg.msg_iter, base);

		buflen -= base;

	}

	len = sock_recvmsg(svsk->sk_sock, &msg, MSG_DONTWAIT);

	/* If we read a full record, then assume there may be more

	 * data to read (stream based sockets only!)

	 */

	if (len == buflen)

		set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);



	dprintk("svc: socket %p recvfrom(%p, %zu) = %d\n",

	dprintk("svc: socket %p recvfrom(%p, %zu) = %zd\n",

		svsk, iov[0].iov_base, iov[0].iov_len, len);

	return len;

}



static int svc_partial_recvfrom(struct svc_rqst *rqstp,

				struct kvec *iov, int nr,

				int buflen, unsigned int base)

{

	size_t save_iovlen;

	void *save_iovbase;

	unsigned int i;

	int ret;



	if (base == 0)

		return svc_recvfrom(rqstp, iov, nr, buflen);



	for (i = 0; i < nr; i++) {

		if (iov[i].iov_len > base)

			break;

		base -= iov[i].iov_len;

	}

	save_iovlen = iov[i].iov_len;

	save_iovbase = iov[i].iov_base;

	iov[i].iov_len -= base;

	iov[i].iov_base += base;

	ret = svc_recvfrom(rqstp, &iov[i], nr - i, buflen);

	iov[i].iov_len = save_iovlen;

	iov[i].iov_base = save_iovbase;

	return ret;

}



/*

 * Set socket snd and rcv buffer lengths

 */
@@ -962,7 +937,8 @@ static int svc_tcp_recv_record(struct svc_sock *svsk, struct svc_rqst *rqstp) 
		want = sizeof(rpc_fraghdr) - svsk->sk_tcplen;

		iov.iov_base = ((char *) &svsk->sk_reclen) + svsk->sk_tcplen;

		iov.iov_len  = want;

		if ((len = svc_recvfrom(rqstp, &iov, 1, want)) < 0)

		len = svc_recvfrom(rqstp, &iov, 1, want, 0);

		if (len < 0)

			goto error;

		svsk->sk_tcplen += len;
@@ -1088,14 +1064,13 @@ static int svc_tcp_recvfrom(struct svc_rqst *rqstp) 


	vec = rqstp->rq_vec;



	pnum = copy_pages_to_kvecs(&vec[0], &rqstp->rq_pages[0],

						svsk->sk_datalen + want);

	pnum = copy_pages_to_kvecs(&vec[0], &rqstp->rq_pages[0], base + want);



	rqstp->rq_respages = &rqstp->rq_pages[pnum];

	rqstp->rq_next_page = rqstp->rq_respages + 1;



	/* Now receive data */

	len = svc_partial_recvfrom(rqstp, vec, pnum, want, base);

	len = svc_recvfrom(rqstp, vec, pnum, base + want, base);

	if (len >= 0) {

		svsk->sk_tcplen += len;

		svsk->sk_datalen += len;