From: Tom Tucker Date: Mon, 31 Dec 2007 03:08:10 +0000 (-0600) Subject: svc: Make deferral processing xprt independent X-Git-Tag: v2.6.25-rc1~1072^2~27 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8c7b0172a1db8120d25ecb4eff69664c52ee7639;p=linux-2.6 svc: Make deferral processing xprt independent This patch moves the transport independent sk_deferred list to the svc_xprt structure and updates the svc_deferred_req structure to keep pointers to svc_xprt's directly. The deferral processing code is also moved out of the transport dependent recvfrom functions and into the generic svc_recv path. Signed-off-by: Tom Tucker Acked-by: Neil Brown Reviewed-by: Chuck Lever Reviewed-by: Greg Banks Signed-off-by: J. Bruce Fields --- diff --git a/include/linux/sunrpc/svc.h b/include/linux/sunrpc/svc.h index cfb2652f6f..40adc9d75a 100644 --- a/include/linux/sunrpc/svc.h +++ b/include/linux/sunrpc/svc.h @@ -320,7 +320,7 @@ static inline void svc_free_res_pages(struct svc_rqst *rqstp) struct svc_deferred_req { u32 prot; /* protocol (UDP or TCP) */ - struct svc_sock *svsk; + struct svc_xprt *xprt; struct sockaddr_storage addr; /* where reply must go */ size_t addrlen; union svc_addr_u daddr; /* where reply must come from */ diff --git a/include/linux/sunrpc/svc_xprt.h b/include/linux/sunrpc/svc_xprt.h index 1b5da39bb4..6a8445b9df 100644 --- a/include/linux/sunrpc/svc_xprt.h +++ b/include/linux/sunrpc/svc_xprt.h @@ -59,6 +59,8 @@ struct svc_xprt { spinlock_t xpt_lock; /* protects sk_deferred * and xpt_auth_cache */ void *xpt_auth_cache;/* auth cache */ + struct list_head xpt_deferred; /* deferred requests that need + * to be revisted */ }; int svc_reg_xprt_class(struct svc_xprt_class *); diff --git a/include/linux/sunrpc/svcsock.h b/include/linux/sunrpc/svcsock.h index f2ed6a25a7..96a229e6b9 100644 --- a/include/linux/sunrpc/svcsock.h +++ b/include/linux/sunrpc/svcsock.h @@ -20,9 +20,6 @@ struct svc_sock { struct socket * sk_sock; /* berkeley socket layer */ struct sock * sk_sk; /* INET layer */ - struct list_head sk_deferred; /* deferred requests that need to - * be revisted */ - /* We keep the old state_change and data_ready CB's here */ void (*sk_ostate)(struct sock *); void (*sk_odata)(struct sock *, int bytes); diff --git a/net/sunrpc/svc_xprt.c b/net/sunrpc/svc_xprt.c index d2ac130b90..023aeb0ecf 100644 --- a/net/sunrpc/svc_xprt.c +++ b/net/sunrpc/svc_xprt.c @@ -102,6 +102,7 @@ void svc_xprt_init(struct svc_xprt_class *xcl, struct svc_xprt *xprt, xprt->xpt_server = serv; INIT_LIST_HEAD(&xprt->xpt_list); INIT_LIST_HEAD(&xprt->xpt_ready); + INIT_LIST_HEAD(&xprt->xpt_deferred); mutex_init(&xprt->xpt_mutex); spin_lock_init(&xprt->xpt_lock); } diff --git a/net/sunrpc/svcsock.c b/net/sunrpc/svcsock.c index 5c9422c9a9..9d0a9e6c0e 100644 --- a/net/sunrpc/svcsock.c +++ b/net/sunrpc/svcsock.c @@ -89,7 +89,7 @@ static void svc_close_xprt(struct svc_xprt *xprt); static void svc_sock_detach(struct svc_xprt *); static void svc_sock_free(struct svc_xprt *); -static struct svc_deferred_req *svc_deferred_dequeue(struct svc_sock *svsk); +static struct svc_deferred_req *svc_deferred_dequeue(struct svc_xprt *xprt); static int svc_deferred_recv(struct svc_rqst *rqstp); static struct cache_deferred_req *svc_defer(struct cache_req *req); static struct svc_xprt *svc_create_socket(struct svc_serv *, int, @@ -771,11 +771,6 @@ svc_udp_recvfrom(struct svc_rqst *rqstp) (serv->sv_nrthreads+3) * serv->sv_max_mesg, (serv->sv_nrthreads+3) * serv->sv_max_mesg); - if ((rqstp->rq_deferred = svc_deferred_dequeue(svsk))) { - svc_xprt_received(&svsk->sk_xprt); - return svc_deferred_recv(rqstp); - } - clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); skb = NULL; err = kernel_recvmsg(svsk->sk_sock, &msg, NULL, @@ -1138,11 +1133,6 @@ svc_tcp_recvfrom(struct svc_rqst *rqstp) test_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags), test_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags)); - if ((rqstp->rq_deferred = svc_deferred_dequeue(svsk))) { - svc_xprt_received(&svsk->sk_xprt); - return svc_deferred_recv(rqstp); - } - if (test_and_clear_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags)) /* sndbuf needs to have room for one request * per thread, otherwise we can stall even when the @@ -1601,7 +1591,12 @@ svc_recv(struct svc_rqst *rqstp, long timeout) dprintk("svc: server %p, pool %u, socket %p, inuse=%d\n", rqstp, pool->sp_id, svsk, atomic_read(&svsk->sk_xprt.xpt_ref.refcount)); - len = svsk->sk_xprt.xpt_ops->xpo_recvfrom(rqstp); + rqstp->rq_deferred = svc_deferred_dequeue(&svsk->sk_xprt); + if (rqstp->rq_deferred) { + svc_xprt_received(&svsk->sk_xprt); + len = svc_deferred_recv(rqstp); + } else + len = svsk->sk_xprt.xpt_ops->xpo_recvfrom(rqstp); dprintk("svc: got len=%d\n", len); } @@ -1758,7 +1753,6 @@ static struct svc_sock *svc_setup_socket(struct svc_serv *serv, svsk->sk_ostate = inet->sk_state_change; svsk->sk_odata = inet->sk_data_ready; svsk->sk_owspace = inet->sk_write_space; - INIT_LIST_HEAD(&svsk->sk_deferred); /* Initialize the socket */ if (sock->type == SOCK_DGRAM) @@ -1976,22 +1970,21 @@ void svc_close_all(struct list_head *xprt_list) static void svc_revisit(struct cache_deferred_req *dreq, int too_many) { struct svc_deferred_req *dr = container_of(dreq, struct svc_deferred_req, handle); - struct svc_sock *svsk; + struct svc_xprt *xprt = dr->xprt; if (too_many) { - svc_xprt_put(&dr->svsk->sk_xprt); + svc_xprt_put(xprt); kfree(dr); return; } dprintk("revisit queued\n"); - svsk = dr->svsk; - dr->svsk = NULL; - spin_lock(&svsk->sk_xprt.xpt_lock); - list_add(&dr->handle.recent, &svsk->sk_deferred); - spin_unlock(&svsk->sk_xprt.xpt_lock); - set_bit(XPT_DEFERRED, &svsk->sk_xprt.xpt_flags); - svc_xprt_enqueue(&svsk->sk_xprt); - svc_xprt_put(&svsk->sk_xprt); + dr->xprt = NULL; + spin_lock(&xprt->xpt_lock); + list_add(&dr->handle.recent, &xprt->xpt_deferred); + spin_unlock(&xprt->xpt_lock); + set_bit(XPT_DEFERRED, &xprt->xpt_flags); + svc_xprt_enqueue(xprt); + svc_xprt_put(xprt); } static struct cache_deferred_req * @@ -2022,7 +2015,7 @@ svc_defer(struct cache_req *req) memcpy(dr->args, rqstp->rq_arg.head[0].iov_base-skip, dr->argslen<<2); } svc_xprt_get(rqstp->rq_xprt); - dr->svsk = rqstp->rq_sock; + dr->xprt = rqstp->rq_xprt; dr->handle.revisit = svc_revisit; return &dr->handle; @@ -2048,21 +2041,21 @@ static int svc_deferred_recv(struct svc_rqst *rqstp) } -static struct svc_deferred_req *svc_deferred_dequeue(struct svc_sock *svsk) +static struct svc_deferred_req *svc_deferred_dequeue(struct svc_xprt *xprt) { struct svc_deferred_req *dr = NULL; - if (!test_bit(XPT_DEFERRED, &svsk->sk_xprt.xpt_flags)) + if (!test_bit(XPT_DEFERRED, &xprt->xpt_flags)) return NULL; - spin_lock(&svsk->sk_xprt.xpt_lock); - clear_bit(XPT_DEFERRED, &svsk->sk_xprt.xpt_flags); - if (!list_empty(&svsk->sk_deferred)) { - dr = list_entry(svsk->sk_deferred.next, + spin_lock(&xprt->xpt_lock); + clear_bit(XPT_DEFERRED, &xprt->xpt_flags); + if (!list_empty(&xprt->xpt_deferred)) { + dr = list_entry(xprt->xpt_deferred.next, struct svc_deferred_req, handle.recent); list_del_init(&dr->handle.recent); - set_bit(XPT_DEFERRED, &svsk->sk_xprt.xpt_flags); + set_bit(XPT_DEFERRED, &xprt->xpt_flags); } - spin_unlock(&svsk->sk_xprt.xpt_lock); + spin_unlock(&xprt->xpt_lock); return dr; }