From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qc0-f180.google.com (mail-qc0-f180.google.com [209.85.216.180]) by kanga.kvack.org (Postfix) with ESMTP id CD823900016 for ; Wed, 3 Jun 2015 16:26:38 -0400 (EDT) Received: by qcmi9 with SMTP id i9so9545045qcm.0 for ; Wed, 03 Jun 2015 13:26:38 -0700 (PDT) Received: from userp1040.oracle.com (userp1040.oracle.com. [156.151.31.81]) by mx.google.com with ESMTPS id 184si1747327qhu.27.2015.06.03.13.26.37 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 03 Jun 2015 13:26:37 -0700 (PDT) Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 7.3 \(1878.6\)) Subject: Re: [PATCH v3 5/5] sunrpc: turn swapper_enable/disable functions into rpc_xprt_ops From: Chuck Lever In-Reply-To: <1433362469-2615-6-git-send-email-jeff.layton@primarydata.com> Date: Wed, 3 Jun 2015 16:28:52 -0400 Content-Transfer-Encoding: quoted-printable Message-Id: References: <1433362469-2615-1-git-send-email-jeff.layton@primarydata.com> <1433362469-2615-6-git-send-email-jeff.layton@primarydata.com> Sender: owner-linux-mm@kvack.org List-ID: To: Jeff Layton Cc: Trond Myklebust , Linux NFS Mailing List , linux-mm@kvack.org, LKML Kernel , Mel Gorman , Jerome Marchand On Jun 3, 2015, at 4:14 PM, Jeff Layton wrote: > RDMA xprts don't have a sock_xprt, but an rdma_xprt, so the > xs_swapper_enable/disable functions will likely oops when fed an RDMA > xprt. Turn these functions into rpc_xprt_ops so that that doesn't > occur. For now the RDMA versions are no-ops that just return -EINVAL > on an attempt to swapon. >=20 > Cc: Chuck Lever > Signed-off-by: Jeff Layton Thanks, Jeff, that works for me. Reviewed-by: Chuck Lever > --- > include/linux/sunrpc/xprt.h | 16 ++++++++++++++-- > net/sunrpc/clnt.c | 4 ++-- > net/sunrpc/xprtrdma/transport.c | 15 ++++++++++++++- > net/sunrpc/xprtsock.c | 31 +++++++++++++++++++++++++------ > 4 files changed, 55 insertions(+), 11 deletions(-) >=20 > diff --git a/include/linux/sunrpc/xprt.h b/include/linux/sunrpc/xprt.h > index 26b1624128ec..7eb58610eb94 100644 > --- a/include/linux/sunrpc/xprt.h > +++ b/include/linux/sunrpc/xprt.h > @@ -133,6 +133,8 @@ struct rpc_xprt_ops { > void (*close)(struct rpc_xprt *xprt); > void (*destroy)(struct rpc_xprt *xprt); > void (*print_stats)(struct rpc_xprt *xprt, struct = seq_file *seq); > + int (*enable_swap)(struct rpc_xprt *xprt); > + void (*disable_swap)(struct rpc_xprt *xprt); > }; >=20 > /* > @@ -327,6 +329,18 @@ static inline __be32 = *xprt_skip_transport_header(struct rpc_xprt *xprt, __be32 * > return p + xprt->tsh_size; > } >=20 > +static inline int > +xprt_enable_swap(struct rpc_xprt *xprt) > +{ > + return xprt->ops->enable_swap(xprt); > +} > + > +static inline void > +xprt_disable_swap(struct rpc_xprt *xprt) > +{ > + xprt->ops->disable_swap(xprt); > +} > + > /* > * Transport switch helper functions > */ > @@ -345,8 +359,6 @@ void = xprt_release_rqst_cong(struct rpc_task *task); > void xprt_disconnect_done(struct rpc_xprt *xprt); > void xprt_force_disconnect(struct rpc_xprt *xprt); > void xprt_conditional_disconnect(struct rpc_xprt = *xprt, unsigned int cookie); > -int xs_swapper_enable(struct rpc_xprt *xprt); > -void xs_swapper_disable(struct rpc_xprt *xprt); >=20 > bool xprt_lock_connect(struct rpc_xprt *, struct = rpc_task *, void *); > void xprt_unlock_connect(struct rpc_xprt *, void *); > diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c > index 804a75e71e84..60d1835edb26 100644 > --- a/net/sunrpc/clnt.c > +++ b/net/sunrpc/clnt.c > @@ -2492,7 +2492,7 @@ retry: > goto retry; > } >=20 > - ret =3D xs_swapper_enable(xprt); > + ret =3D xprt_enable_swap(xprt); > xprt_put(xprt); > } > return ret; > @@ -2519,7 +2519,7 @@ retry: > goto retry; > } >=20 > - xs_swapper_disable(xprt); > + xprt_disable_swap(xprt); > xprt_put(xprt); > } > } > diff --git a/net/sunrpc/xprtrdma/transport.c = b/net/sunrpc/xprtrdma/transport.c > index 54f23b1be986..ebf6fe759f0e 100644 > --- a/net/sunrpc/xprtrdma/transport.c > +++ b/net/sunrpc/xprtrdma/transport.c > @@ -682,6 +682,17 @@ static void xprt_rdma_print_stats(struct rpc_xprt = *xprt, struct seq_file *seq) > r_xprt->rx_stats.bad_reply_count); > } >=20 > +static int > +xprt_rdma_enable_swap(struct rpc_xprt *xprt) > +{ > + return -EINVAL; > +} > + > +static void > +xprt_rdma_disable_swap(struct rpc_xprt *xprt) > +{ > +} > + > /* > * Plumbing for rpc transport switch and kernel module > */ > @@ -700,7 +711,9 @@ static struct rpc_xprt_ops xprt_rdma_procs =3D { > .send_request =3D xprt_rdma_send_request, > .close =3D xprt_rdma_close, > .destroy =3D xprt_rdma_destroy, > - .print_stats =3D xprt_rdma_print_stats > + .print_stats =3D xprt_rdma_print_stats, > + .enable_swap =3D xprt_rdma_enable_swap, > + .disable_swap =3D xprt_rdma_disable_swap, > }; >=20 > static struct xprt_class xprt_rdma =3D { > diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c > index e3596fe184a0..600194bfdbce 100644 > --- a/net/sunrpc/xprtsock.c > +++ b/net/sunrpc/xprtsock.c > @@ -1985,14 +1985,14 @@ static void xs_set_memalloc(struct rpc_xprt = *xprt) > } >=20 > /** > - * xs_swapper_enable - Tag this transport as being used for swap. > + * xs_enable_swap - Tag this transport as being used for swap. > * @xprt: transport to tag > * > * Take a reference to this transport on behalf of the rpc_clnt, and > * optionally mark it for swapping if it wasn't already. > */ > -int > -xs_swapper_enable(struct rpc_xprt *xprt) > +static int > +xs_enable_swap(struct rpc_xprt *xprt) > { > struct sock_xprt *xs =3D container_of(xprt, struct sock_xprt, = xprt); >=20 > @@ -2007,14 +2007,14 @@ xs_swapper_enable(struct rpc_xprt *xprt) > } >=20 > /** > - * xs_swapper_disable - Untag this transport as being used for swap. > + * xs_disable_swap - Untag this transport as being used for swap. > * @xprt: transport to tag > * > * Drop a "swapper" reference to this xprt on behalf of the rpc_clnt. = If the > * swapper refcount goes to 0, untag the socket as a memalloc socket. > */ > -void > -xs_swapper_disable(struct rpc_xprt *xprt) > +static void > +xs_disable_swap(struct rpc_xprt *xprt) > { > struct sock_xprt *xs =3D container_of(xprt, struct sock_xprt, = xprt); >=20 > @@ -2030,6 +2030,17 @@ xs_swapper_disable(struct rpc_xprt *xprt) > static void xs_set_memalloc(struct rpc_xprt *xprt) > { > } > + > +static int > +xs_enable_swap(struct rpc_xprt *xprt) > +{ > + return -EINVAL; > +} > + > +static void > +xs_disable_swap(struct rpc_xprt *xprt) > +{ > +} > #endif >=20 > static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct = socket *sock) > @@ -2496,6 +2507,8 @@ static struct rpc_xprt_ops xs_local_ops =3D { > .close =3D xs_close, > .destroy =3D xs_destroy, > .print_stats =3D xs_local_print_stats, > + .enable_swap =3D xs_enable_swap, > + .disable_swap =3D xs_disable_swap, > }; >=20 > static struct rpc_xprt_ops xs_udp_ops =3D { > @@ -2515,6 +2528,8 @@ static struct rpc_xprt_ops xs_udp_ops =3D { > .close =3D xs_close, > .destroy =3D xs_destroy, > .print_stats =3D xs_udp_print_stats, > + .enable_swap =3D xs_enable_swap, > + .disable_swap =3D xs_disable_swap, > }; >=20 > static struct rpc_xprt_ops xs_tcp_ops =3D { > @@ -2531,6 +2546,8 @@ static struct rpc_xprt_ops xs_tcp_ops =3D { > .close =3D xs_tcp_shutdown, > .destroy =3D xs_destroy, > .print_stats =3D xs_tcp_print_stats, > + .enable_swap =3D xs_enable_swap, > + .disable_swap =3D xs_disable_swap, > }; >=20 > /* > @@ -2548,6 +2565,8 @@ static struct rpc_xprt_ops bc_tcp_ops =3D { > .close =3D bc_close, > .destroy =3D bc_destroy, > .print_stats =3D xs_tcp_print_stats, > + .enable_swap =3D xs_enable_swap, > + .disable_swap =3D xs_disable_swap, > }; >=20 > static int xs_init_anyaddr(const int family, struct sockaddr *sap) > --=20 > 2.4.2 >=20 -- Chuck Lever chuck[dot]lever[at]oracle[dot]com -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. 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