diff options
Diffstat (limited to 'net')
| -rw-r--r-- | net/sunrpc/svcsock.c | 82 |
1 files changed, 56 insertions, 26 deletions
diff --git a/net/sunrpc/svcsock.c b/net/sunrpc/svcsock.c index 492a1dc544f3..2007881a5b26 100644 --- a/net/sunrpc/svcsock.c +++ b/net/sunrpc/svcsock.c @@ -205,22 +205,6 @@ static void svc_release_skb(struct svc_rqst *rqstp) } /* - * Any space to write? - */ -static inline unsigned long -svc_sock_wspace(struct svc_sock *svsk) -{ - int wspace; - - if (svsk->sk_sock->type == SOCK_STREAM) - wspace = sk_stream_wspace(svsk->sk_sk); - else - wspace = sock_wspace(svsk->sk_sk); - - return wspace; -} - -/* * Queue up a socket with data pending. If there are idle nfsd * processes, wake 'em up. * @@ -269,22 +253,24 @@ svc_sock_enqueue(struct svc_sock *svsk) BUG_ON(svsk->sk_pool != NULL); svsk->sk_pool = pool; - set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); - if (((atomic_read(&svsk->sk_reserved) + serv->sv_max_mesg)*2 - > svc_sock_wspace(svsk)) - && !test_bit(SK_CLOSE, &svsk->sk_flags) - && !test_bit(SK_CONN, &svsk->sk_flags)) { + /* Handle pending connection */ + if (test_bit(SK_CONN, &svsk->sk_flags)) + goto process; + + /* Handle close in-progress */ + if (test_bit(SK_CLOSE, &svsk->sk_flags)) + goto process; + + /* Check if we have space to reply to a request */ + if (!svsk->sk_xprt.xpt_ops->xpo_has_wspace(&svsk->sk_xprt)) { /* Don't enqueue while not enough space for reply */ - dprintk("svc: socket %p no space, %d*2 > %ld, not enqueued\n", - svsk->sk_sk, atomic_read(&svsk->sk_reserved)+serv->sv_max_mesg, - svc_sock_wspace(svsk)); + dprintk("svc: no write space, socket %p not enqueued\n", svsk); svsk->sk_pool = NULL; clear_bit(SK_BUSY, &svsk->sk_flags); goto out_unlock; } - clear_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); - + process: if (!list_empty(&pool->sp_threads)) { rqstp = list_entry(pool->sp_threads.next, struct svc_rqst, @@ -897,6 +883,24 @@ static void svc_udp_prep_reply_hdr(struct svc_rqst *rqstp) { } +static int svc_udp_has_wspace(struct svc_xprt *xprt) +{ + struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); + struct svc_serv *serv = svsk->sk_server; + unsigned long required; + + /* + * Set the SOCK_NOSPACE flag before checking the available + * sock space. + */ + set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); + required = atomic_read(&svsk->sk_reserved) + serv->sv_max_mesg; + if (required*2 > sock_wspace(svsk->sk_sk)) + return 0; + clear_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); + return 1; +} + static struct svc_xprt_ops svc_udp_ops = { .xpo_recvfrom = svc_udp_recvfrom, .xpo_sendto = svc_udp_sendto, @@ -904,6 +908,7 @@ static struct svc_xprt_ops svc_udp_ops = { .xpo_detach = svc_sock_detach, .xpo_free = svc_sock_free, .xpo_prep_reply_hdr = svc_udp_prep_reply_hdr, + .xpo_has_wspace = svc_udp_has_wspace, }; static struct svc_xprt_class svc_udp_class = { @@ -1366,6 +1371,30 @@ static void svc_tcp_prep_reply_hdr(struct svc_rqst *rqstp) svc_putnl(resv, 0); } +static int svc_tcp_has_wspace(struct svc_xprt *xprt) +{ + struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); + struct svc_serv *serv = svsk->sk_server; + int required; + int wspace; + + /* + * Set the SOCK_NOSPACE flag before checking the available + * sock space. + */ + set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); + required = atomic_read(&svsk->sk_reserved) + serv->sv_max_mesg; + wspace = sk_stream_wspace(svsk->sk_sk); + + if (wspace < sk_stream_min_wspace(svsk->sk_sk)) + return 0; + if (required * 2 > wspace) + return 0; + + clear_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); + return 1; +} + static struct svc_xprt_ops svc_tcp_ops = { .xpo_recvfrom = svc_tcp_recvfrom, .xpo_sendto = svc_tcp_sendto, @@ -1373,6 +1402,7 @@ static struct svc_xprt_ops svc_tcp_ops = { .xpo_detach = svc_sock_detach, .xpo_free = svc_sock_free, .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr, + .xpo_has_wspace = svc_tcp_has_wspace, }; static struct svc_xprt_class svc_tcp_class = { |