diff options
| author |   Trond Myklebust <trond.myklebust@primarydata.com> | 2014-07-24 23:59:32 -0400 |
|---|---|---|
| committer |   J. Bruce Fields <bfields@redhat.com> | 2014-07-29 16:10:19 -0400 |
| commit | c7fb3f0631b8d66b90e0642a95b948febb3f3cee (patch) | |
| tree | 799554628d9375a2d0f45925ac58984de07080f5 /net/sunrpc/svcsock.c | |
| parent | SUNRPC: Reduce contention in svc_xprt_enqueue() (diff) | |
| download | linux-dev-c7fb3f0631b8d66b90e0642a95b948febb3f3cee.tar.xz linux-dev-c7fb3f0631b8d66b90e0642a95b948febb3f3cee.zip | |
SUNRPC: svc_tcp_write_space: don't clear SOCK_NOSPACE prematurely
If requests are queued in the socket inbuffer waiting for an
svc_tcp_has_wspace() requirement to be satisfied, then we do not want
to clear the SOCK_NOSPACE flag until we've satisfied that requirement.
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Diffstat (limited to 'net/sunrpc/svcsock.c')
| -rw-r--r-- | net/sunrpc/svcsock.c | 39 |
1 files changed, 21 insertions, 18 deletions
diff --git a/net/sunrpc/svcsock.c b/net/sunrpc/svcsock.c index b2437ee93657..88db211d4264 100644 --- a/net/sunrpc/svcsock.c +++ b/net/sunrpc/svcsock.c @@ -446,11 +446,31 @@ static void svc_write_space(struct sock *sk) } } +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_xprt.xpt_server; + int required; + + if (test_bit(XPT_LISTENER, &xprt->xpt_flags)) + return 1; + required = atomic_read(&xprt->xpt_reserved) + serv->sv_max_mesg; + if (sk_stream_wspace(svsk->sk_sk) >= required || + (sk_stream_min_wspace(svsk->sk_sk) == 0 && + atomic_read(&xprt->xpt_reserved) == 0)) + return 1; + set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); + return 0; +} + static void svc_tcp_write_space(struct sock *sk) { + struct svc_sock *svsk = (struct svc_sock *)(sk->sk_user_data); struct socket *sock = sk->sk_socket; - if (sk_stream_is_writeable(sk) && sock) + if (!sk_stream_is_writeable(sk) || !sock) + return; + if (!svsk || svc_tcp_has_wspace(&svsk->sk_xprt)) clear_bit(SOCK_NOSPACE, &sock->flags); svc_write_space(sk); } @@ -1198,23 +1218,6 @@ 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_xprt.xpt_server; - int required; - - if (test_bit(XPT_LISTENER, &xprt->xpt_flags)) - return 1; - required = atomic_read(&xprt->xpt_reserved) + serv->sv_max_mesg; - if (sk_stream_wspace(svsk->sk_sk) >= required || - (sk_stream_min_wspace(svsk->sk_sk) == 0 && - atomic_read(&xprt->xpt_reserved) == 0)) - return 1; - set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); - return 0; -} - static struct svc_xprt *svc_tcp_create(struct svc_serv *serv, struct net *net, struct sockaddr *sa, int salen, |