diff options
| -rw-r--r-- | include/linux/sunrpc/svc_xprt.h | 6 | ||||
| -rw-r--r-- | net/sunrpc/svc_xprt.c | 12 | ||||
| -rw-r--r-- | net/sunrpc/svcsock.c | 25 | ||||
| -rw-r--r-- | net/sunrpc/xprtrdma/svc_rdma_backchannel.c | 35 | ||||
| -rw-r--r-- | net/sunrpc/xprtrdma/svc_rdma_sendto.c | 10 | ||||
| -rw-r--r-- | net/sunrpc/xprtsock.c | 12 |
6 files changed, 64 insertions, 36 deletions
diff --git a/include/linux/sunrpc/svc_xprt.h b/include/linux/sunrpc/svc_xprt.h index 9e1e046de176..aca35ab5cff2 100644 --- a/include/linux/sunrpc/svc_xprt.h +++ b/include/linux/sunrpc/svc_xprt.h @@ -117,6 +117,12 @@ static inline int register_xpt_user(struct svc_xprt *xpt, struct svc_xpt_user *u return 0; } +static inline bool svc_xprt_is_dead(const struct svc_xprt *xprt) +{ + return (test_bit(XPT_DEAD, &xprt->xpt_flags) != 0) || + (test_bit(XPT_CLOSE, &xprt->xpt_flags) != 0); +} + int svc_reg_xprt_class(struct svc_xprt_class *); void svc_unreg_xprt_class(struct svc_xprt_class *); void svc_xprt_init(struct net *, struct svc_xprt_class *, struct svc_xprt *, diff --git a/net/sunrpc/svc_xprt.c b/net/sunrpc/svc_xprt.c index 2284ff038dad..07cdbf7d5764 100644 --- a/net/sunrpc/svc_xprt.c +++ b/net/sunrpc/svc_xprt.c @@ -914,16 +914,10 @@ int svc_send(struct svc_rqst *rqstp) xb->page_len + xb->tail[0].iov_len; trace_svc_sendto(xb); - - /* Grab mutex to serialize outgoing data. */ - mutex_lock(&xprt->xpt_mutex); trace_svc_stats_latency(rqstp); - if (test_bit(XPT_DEAD, &xprt->xpt_flags) - || test_bit(XPT_CLOSE, &xprt->xpt_flags)) - len = -ENOTCONN; - else - len = xprt->xpt_ops->xpo_sendto(rqstp); - mutex_unlock(&xprt->xpt_mutex); + + len = xprt->xpt_ops->xpo_sendto(rqstp); + trace_svc_send(rqstp, len); svc_xprt_release(rqstp); diff --git a/net/sunrpc/svcsock.c b/net/sunrpc/svcsock.c index 023514e392b3..3e7b6445e317 100644 --- a/net/sunrpc/svcsock.c +++ b/net/sunrpc/svcsock.c @@ -506,6 +506,9 @@ out_free: * svc_udp_sendto - Send out a reply on a UDP socket * @rqstp: completed svc_rqst * + * xpt_mutex ensures @rqstp's whole message is written to the socket + * without interruption. + * * Returns the number of bytes sent, or a negative errno. */ static int svc_udp_sendto(struct svc_rqst *rqstp) @@ -531,6 +534,11 @@ static int svc_udp_sendto(struct svc_rqst *rqstp) svc_set_cmsg_data(rqstp, cmh); + mutex_lock(&xprt->xpt_mutex); + + if (svc_xprt_is_dead(xprt)) + goto out_notconn; + err = xprt_sock_sendmsg(svsk->sk_sock, &msg, xdr, 0, 0, &sent); xdr_free_bvec(xdr); if (err == -ECONNREFUSED) { @@ -538,9 +546,15 @@ static int svc_udp_sendto(struct svc_rqst *rqstp) err = xprt_sock_sendmsg(svsk->sk_sock, &msg, xdr, 0, 0, &sent); xdr_free_bvec(xdr); } + + mutex_unlock(&xprt->xpt_mutex); if (err < 0) return err; return sent; + +out_notconn: + mutex_unlock(&xprt->xpt_mutex); + return -ENOTCONN; } static int svc_udp_has_wspace(struct svc_xprt *xprt) @@ -1063,6 +1077,9 @@ err_noclose: * svc_tcp_sendto - Send out a reply on a TCP socket * @rqstp: completed svc_rqst * + * xpt_mutex ensures @rqstp's whole message is written to the socket + * without interruption. + * * Returns the number of bytes sent, or a negative errno. */ static int svc_tcp_sendto(struct svc_rqst *rqstp) @@ -1080,12 +1097,19 @@ static int svc_tcp_sendto(struct svc_rqst *rqstp) svc_release_skb(rqstp); + mutex_lock(&xprt->xpt_mutex); + if (svc_xprt_is_dead(xprt)) + goto out_notconn; err = xprt_sock_sendmsg(svsk->sk_sock, &msg, xdr, 0, marker, &sent); xdr_free_bvec(xdr); if (err < 0 || sent != (xdr->len + sizeof(marker))) goto out_close; + mutex_unlock(&xprt->xpt_mutex); return sent; +out_notconn: + mutex_unlock(&xprt->xpt_mutex); + return -ENOTCONN; out_close: pr_notice("rpc-srv/tcp: %s: %s %d when sending %d bytes - shutting down socket\n", xprt->xpt_server->sv_name, @@ -1093,6 +1117,7 @@ out_close: (err < 0) ? err : sent, xdr->len); set_bit(XPT_CLOSE, &xprt->xpt_flags); svc_xprt_enqueue(xprt); + mutex_unlock(&xprt->xpt_mutex); return -EAGAIN; } diff --git a/net/sunrpc/xprtrdma/svc_rdma_backchannel.c b/net/sunrpc/xprtrdma/svc_rdma_backchannel.c index af7eb8d202ae..d9aab4504f2c 100644 --- a/net/sunrpc/xprtrdma/svc_rdma_backchannel.c +++ b/net/sunrpc/xprtrdma/svc_rdma_backchannel.c @@ -210,34 +210,31 @@ drop_connection: return -ENOTCONN; } -/* Send an RPC call on the passive end of a transport - * connection. +/** + * xprt_rdma_bc_send_request - Send a reverse-direction Call + * @rqst: rpc_rqst containing Call message to be sent + * + * Return values: + * %0 if the message was sent successfully + * %ENOTCONN if the message was not sent */ -static int -xprt_rdma_bc_send_request(struct rpc_rqst *rqst) +static int xprt_rdma_bc_send_request(struct rpc_rqst *rqst) { struct svc_xprt *sxprt = rqst->rq_xprt->bc_xprt; - struct svcxprt_rdma *rdma; + struct svcxprt_rdma *rdma = + container_of(sxprt, struct svcxprt_rdma, sc_xprt); int ret; dprintk("svcrdma: sending bc call with xid: %08x\n", be32_to_cpu(rqst->rq_xid)); - mutex_lock(&sxprt->xpt_mutex); - - ret = -ENOTCONN; - rdma = container_of(sxprt, struct svcxprt_rdma, sc_xprt); - if (!test_bit(XPT_DEAD, &sxprt->xpt_flags)) { - ret = rpcrdma_bc_send_request(rdma, rqst); - if (ret == -ENOTCONN) - svc_close_xprt(sxprt); - } + if (test_bit(XPT_DEAD, &sxprt->xpt_flags)) + return -ENOTCONN; - mutex_unlock(&sxprt->xpt_mutex); - - if (ret < 0) - return ret; - return 0; + ret = rpcrdma_bc_send_request(rdma, rqst); + if (ret == -ENOTCONN) + svc_close_xprt(sxprt); + return ret; } static void diff --git a/net/sunrpc/xprtrdma/svc_rdma_sendto.c b/net/sunrpc/xprtrdma/svc_rdma_sendto.c index b6c8643867f2..38e7c3c8c4a9 100644 --- a/net/sunrpc/xprtrdma/svc_rdma_sendto.c +++ b/net/sunrpc/xprtrdma/svc_rdma_sendto.c @@ -868,12 +868,10 @@ int svc_rdma_sendto(struct svc_rqst *rqstp) __be32 *p; int ret; - /* Create the RDMA response header. xprt->xpt_mutex, - * acquired in svc_send(), serializes RPC replies. The - * code path below that inserts the credit grant value - * into each transport header runs only inside this - * critical section. - */ + ret = -ENOTCONN; + if (svc_xprt_is_dead(xprt)) + goto err0; + ret = -ENOMEM; sctxt = svc_rdma_send_ctxt_get(rdma); if (!sctxt) diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c index 845d0be805ec..839c49330785 100644 --- a/net/sunrpc/xprtsock.c +++ b/net/sunrpc/xprtsock.c @@ -2548,8 +2548,16 @@ static int bc_sendto(struct rpc_rqst *req) return sent; } -/* - * The send routine. Borrows from svc_send +/** + * bc_send_request - Send a backchannel Call on a TCP socket + * @req: rpc_rqst containing Call message to be sent + * + * xpt_mutex ensures @rqstp's whole message is written to the socket + * without interruption. + * + * Return values: + * %0 if the message was sent successfully + * %ENOTCONN if the message was not sent */ static int bc_send_request(struct rpc_rqst *req) { |