sunrpc: turn swapper_enable/disable functions into rpc_xprt_ops

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.

Cc: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Jeff Layton <jeff.layton@primarydata.com>
Reviewed-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>

1 files changed, 25 insertions, 6 deletions

diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c
index e0efd8514886..bf20726d4ab5 100644
--- a/net/sunrpc/xprtsock.c
+++ b/net/sunrpc/xprtsock.c
@@ -1980,14 +1980,14 @@ static void xs_set_memalloc(struct rpc_xprt *xprt)
 }
 
 /**
- * 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 = container_of(xprt, struct sock_xprt, xprt);
 
@@ -2002,14 +2002,14 @@ xs_swapper_enable(struct rpc_xprt *xprt)
 }
 
 /**
- * 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 = container_of(xprt, struct sock_xprt, xprt);
 
@@ -2025,6 +2025,17 @@ 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
 
 static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
@@ -2488,6 +2499,8 @@ static struct rpc_xprt_ops xs_local_ops = {
         .close                  = xs_close,
         .destroy                = xs_destroy,
         .print_stats            = xs_local_print_stats,
+        .enable_swap            = xs_enable_swap,
+        .disable_swap           = xs_disable_swap,
 };
 
 static struct rpc_xprt_ops xs_udp_ops = {
@@ -2507,6 +2520,8 @@ static struct rpc_xprt_ops xs_udp_ops = {
         .close                  = xs_close,
         .destroy                = xs_destroy,
         .print_stats            = xs_udp_print_stats,
+        .enable_swap            = xs_enable_swap,
+        .disable_swap           = xs_disable_swap,
 };
 
 static struct rpc_xprt_ops xs_tcp_ops = {
@@ -2523,6 +2538,8 @@ static struct rpc_xprt_ops xs_tcp_ops = {
         .close                  = xs_tcp_shutdown,
         .destroy                = xs_destroy,
         .print_stats            = xs_tcp_print_stats,
+        .enable_swap            = xs_enable_swap,
+        .disable_swap           = xs_disable_swap,
 };
 
 /*
@@ -2540,6 +2557,8 @@ static struct rpc_xprt_ops bc_tcp_ops = {
         .close                  = bc_close,
         .destroy                = bc_destroy,
         .print_stats            = xs_tcp_print_stats,
+        .enable_swap            = xs_enable_swap,
+        .disable_swap           = xs_disable_swap,
 };
 
 static int xs_init_anyaddr(const int family, struct sockaddr *sap)