SUNRPC: Create a helper to tell whether a transport is bound
Hide the contents and format of xprt->addr by eliminating direct uses
of the xprt->addr.sin_port field. This change is required to support
alternate RPC host address formats (eg IPv6).
Test-plan:
Destructive testing (unplugging the network temporarily). Repeated runs of
Connectathon locking suite with UDP and TCP.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/include/linux/sunrpc/xprt.h b/include/linux/sunrpc/xprt.h
index 3a0cca2..a711067 100644
--- a/include/linux/sunrpc/xprt.h
+++ b/include/linux/sunrpc/xprt.h
@@ -269,6 +269,7 @@
#define XPRT_CONNECTED (1)
#define XPRT_CONNECTING (2)
#define XPRT_CLOSE_WAIT (3)
+#define XPRT_BOUND (4)
static inline void xprt_set_connected(struct rpc_xprt *xprt)
{
@@ -312,6 +313,21 @@
return test_and_set_bit(XPRT_CONNECTING, &xprt->state);
}
+static inline void xprt_set_bound(struct rpc_xprt *xprt)
+{
+ test_and_set_bit(XPRT_BOUND, &xprt->state);
+}
+
+static inline int xprt_bound(struct rpc_xprt *xprt)
+{
+ return test_bit(XPRT_BOUND, &xprt->state);
+}
+
+static inline void xprt_clear_bound(struct rpc_xprt *xprt)
+{
+ clear_bit(XPRT_BOUND, &xprt->state);
+}
+
#endif /* __KERNEL__*/
#endif /* _LINUX_SUNRPC_XPRT_H */
diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c
index 3e19d32..0b8d03d 100644
--- a/net/sunrpc/clnt.c
+++ b/net/sunrpc/clnt.c
@@ -148,7 +148,6 @@
clnt->cl_maxproc = version->nrprocs;
clnt->cl_protname = program->name;
clnt->cl_pmap = &clnt->cl_pmap_default;
- clnt->cl_port = xprt->addr.sin_port;
clnt->cl_prog = program->number;
clnt->cl_vers = version->number;
clnt->cl_prot = xprt->prot;
@@ -156,7 +155,7 @@
clnt->cl_metrics = rpc_alloc_iostats(clnt);
rpc_init_wait_queue(&clnt->cl_pmap_default.pm_bindwait, "bindwait");
- if (!clnt->cl_port)
+ if (!xprt_bound(clnt->cl_xprt))
clnt->cl_autobind = 1;
clnt->cl_rtt = &clnt->cl_rtt_default;
@@ -570,7 +569,7 @@
void rpc_force_rebind(struct rpc_clnt *clnt)
{
if (clnt->cl_autobind)
- clnt->cl_port = 0;
+ xprt_clear_bound(clnt->cl_xprt);
}
EXPORT_SYMBOL(rpc_force_rebind);
@@ -782,14 +781,15 @@
call_bind(struct rpc_task *task)
{
struct rpc_clnt *clnt = task->tk_client;
+ struct rpc_xprt *xprt = task->tk_xprt;
dprintk("RPC: %4d call_bind (status %d)\n",
task->tk_pid, task->tk_status);
task->tk_action = call_connect;
- if (!clnt->cl_port) {
+ if (!xprt_bound(xprt)) {
task->tk_action = call_bind_status;
- task->tk_timeout = task->tk_xprt->bind_timeout;
+ task->tk_timeout = xprt->bind_timeout;
rpc_getport(task, clnt);
}
}
diff --git a/net/sunrpc/pmap_clnt.c b/net/sunrpc/pmap_clnt.c
index 623180f..209ffdf 100644
--- a/net/sunrpc/pmap_clnt.c
+++ b/net/sunrpc/pmap_clnt.c
@@ -142,15 +142,17 @@
dprintk("RPC: %4d pmap_getport_done(status %d, port %d)\n",
task->tk_pid, task->tk_status, clnt->cl_port);
- xprt->ops->set_port(xprt, 0);
if (task->tk_status < 0) {
/* Make the calling task exit with an error */
+ xprt->ops->set_port(xprt, 0);
task->tk_action = rpc_exit_task;
} else if (clnt->cl_port == 0) {
/* Program not registered */
+ xprt->ops->set_port(xprt, 0);
rpc_exit(task, -EACCES);
} else {
xprt->ops->set_port(xprt, clnt->cl_port);
+ xprt_set_bound(xprt);
clnt->cl_port = htons(clnt->cl_port);
}
spin_lock(&pmap_lock);
@@ -218,6 +220,7 @@
if (IS_ERR(xprt))
return (struct rpc_clnt *)xprt;
xprt->ops->set_port(xprt, RPC_PMAP_PORT);
+ xprt_set_bound(xprt);
if (!privileged)
xprt->resvport = 0;
diff --git a/net/sunrpc/xprt.c b/net/sunrpc/xprt.c
index e8c2bc4..e239ef9 100644
--- a/net/sunrpc/xprt.c
+++ b/net/sunrpc/xprt.c
@@ -534,7 +534,7 @@
dprintk("RPC: %4d xprt_connect xprt %p %s connected\n", task->tk_pid,
xprt, (xprt_connected(xprt) ? "is" : "is not"));
- if (!xprt->addr.sin_port) {
+ if (!xprt_bound(xprt)) {
task->tk_status = -EIO;
return;
}
diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c
index 441bd53..123ac1e 100644
--- a/net/sunrpc/xprtsock.c
+++ b/net/sunrpc/xprtsock.c
@@ -1016,7 +1016,7 @@
struct socket *sock = xprt->sock;
int err, status = -EIO;
- if (xprt->shutdown || xprt->addr.sin_port == 0)
+ if (xprt->shutdown || !xprt_bound(xprt))
goto out;
dprintk("RPC: xs_udp_connect_worker for xprt %p\n", xprt);
@@ -1099,7 +1099,7 @@
struct socket *sock = xprt->sock;
int err, status = -EIO;
- if (xprt->shutdown || xprt->addr.sin_port == 0)
+ if (xprt->shutdown || !xprt_bound(xprt))
goto out;
dprintk("RPC: xs_tcp_connect_worker for xprt %p\n", xprt);
@@ -1307,8 +1307,11 @@
if (xprt->slot == NULL)
return -ENOMEM;
- xprt->prot = IPPROTO_UDP;
+ if (ntohs(xprt->addr.sin_port) != 0)
+ xprt_set_bound(xprt);
xprt->port = xs_get_random_port();
+
+ xprt->prot = IPPROTO_UDP;
xprt->tsh_size = 0;
xprt->resvport = capable(CAP_NET_BIND_SERVICE) ? 1 : 0;
/* XXX: header size can vary due to auth type, IPv6, etc. */
@@ -1348,8 +1351,11 @@
if (xprt->slot == NULL)
return -ENOMEM;
- xprt->prot = IPPROTO_TCP;
+ if (ntohs(xprt->addr.sin_port) != 0)
+ xprt_set_bound(xprt);
xprt->port = xs_get_random_port();
+
+ xprt->prot = IPPROTO_TCP;
xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
xprt->resvport = capable(CAP_NET_BIND_SERVICE) ? 1 : 0;
xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;