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Commit cc248d4b authored by J. Bruce Fields's avatar J. Bruce Fields
Browse files

svcrpc: don't byte-swap sk_reclen in place 



Byte-swapping in place is always a little dubious.

Let's instead define this field to always be big-endian, and do the
swapping on demand where we need it.

Signed-off-by: default avatarJ. Bruce Fields <bfields@redhat.com>
parent 6c1e82a4

include/linux/sunrpc/svcsock.h

+11 −1
Original line number Diff line number Diff line
@@ -26,11 +26,21 @@ struct svc_sock { 
	void			(*sk_owspace)(struct sock *);



	/* private TCP part */

	u32			sk_reclen;	/* length of record */

	__be32			sk_reclen;	/* length of record */

	u32			sk_tcplen;	/* current read length */

	struct page *		sk_pages[RPCSVC_MAXPAGES];	/* received data */

};



static inline u32 svc_sock_reclen(struct svc_sock *svsk)

{

	return ntohl(svsk->sk_reclen) & RPC_FRAGMENT_SIZE_MASK;

}



static inline u32 svc_sock_final_rec(struct svc_sock *svsk)

{

	return ntohl(svsk->sk_reclen) & RPC_LAST_STREAM_FRAGMENT;

}



/*

 * Function prototypes.

 */

net/sunrpc/svcsock.c

+11 −15
Original line number Diff line number Diff line
@@ -950,8 +950,7 @@ static int svc_tcp_recv_record(struct svc_sock *svsk, struct svc_rqst *rqstp) 
			return -EAGAIN;

		}



		svsk->sk_reclen = ntohl(svsk->sk_reclen);

		if (!(svsk->sk_reclen & RPC_LAST_STREAM_FRAGMENT)) {

		if (!(svc_sock_final_rec(svsk))) {

			/* FIXME: technically, a record can be fragmented,

			 *  and non-terminal fragments will not have the top

			 *  bit set in the fragment length header.
@@ -961,21 +960,18 @@ static int svc_tcp_recv_record(struct svc_sock *svsk, struct svc_rqst *rqstp) 
			goto err_delete;

		}



		svsk->sk_reclen &= RPC_FRAGMENT_SIZE_MASK;

		dprintk("svc: TCP record, %d bytes\n", svsk->sk_reclen);

		if (svsk->sk_reclen > serv->sv_max_mesg) {

		dprintk("svc: TCP record, %d bytes\n", svc_sock_reclen(svsk));

		if (svc_sock_reclen(svsk) > serv->sv_max_mesg) {

			net_notice_ratelimited("RPC: fragment too large: 0x%08lx\n",

					       (unsigned long)svsk->sk_reclen);

					(unsigned long)svc_sock_reclen(svsk));

			goto err_delete;

		}

	}



	if (svsk->sk_reclen < 8)

	if (svc_sock_reclen(svsk) < 8)

		goto err_delete; /* client is nuts. */



	len = svsk->sk_reclen;



	return len;

	return svc_sock_reclen(svsk);

error:

	dprintk("RPC: TCP recv_record got %d\n", len);

	return len;
@@ -1019,7 +1015,7 @@ static int receive_cb_reply(struct svc_sock *svsk, struct svc_rqst *rqstp) 
	if (dst->iov_len < src->iov_len)

		return -EAGAIN; /* whatever; just giving up. */

	memcpy(dst->iov_base, src->iov_base, src->iov_len);

	xprt_complete_rqst(req->rq_task, svsk->sk_reclen);

	xprt_complete_rqst(req->rq_task, rqstp->rq_arg.len);

	rqstp->rq_arg.len = 0;

	return 0;

}
@@ -1064,12 +1060,12 @@ static int svc_tcp_recvfrom(struct svc_rqst *rqstp) 
		goto error;



	base = svc_tcp_restore_pages(svsk, rqstp);

	want = svsk->sk_reclen - base;

	want = svc_sock_reclen(svsk) - base;



	vec = rqstp->rq_vec;



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

						svsk->sk_reclen);

						svc_sock_reclen(svsk));



	rqstp->rq_respages = &rqstp->rq_pages[pnum];
@@ -1082,11 +1078,11 @@ static int svc_tcp_recvfrom(struct svc_rqst *rqstp) 
		if (len < 0 && len != -EAGAIN)

			goto err_other;

		dprintk("svc: incomplete TCP record (%d of %d)\n",

			svsk->sk_tcplen, svsk->sk_reclen);

			svsk->sk_tcplen, svc_sock_reclen(svsk));

		goto err_noclose;

	}



	rqstp->rq_arg.len = svsk->sk_reclen;

	rqstp->rq_arg.len = svc_sock_reclen(svsk);

	rqstp->rq_arg.page_base = 0;

	if (rqstp->rq_arg.len <= rqstp->rq_arg.head[0].iov_len) {

		rqstp->rq_arg.head[0].iov_len = rqstp->rq_arg.len;