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-rw-r--r--net/sunrpc/svcsock.c106
1 files changed, 85 insertions, 21 deletions
diff --git a/net/sunrpc/svcsock.c b/net/sunrpc/svcsock.c
index 07919e1..d265aa7 100644
--- a/net/sunrpc/svcsock.c
+++ b/net/sunrpc/svcsock.c
@@ -66,6 +66,13 @@ static void svc_sock_free(struct svc_xprt *);
static struct svc_xprt *svc_create_socket(struct svc_serv *, int,
struct net *, struct sockaddr *,
int, int);
+#if defined(CONFIG_NFS_V4_1)
+static struct svc_xprt *svc_bc_create_socket(struct svc_serv *, int,
+ struct net *, struct sockaddr *,
+ int, int);
+static void svc_bc_sock_free(struct svc_xprt *xprt);
+#endif /* CONFIG_NFS_V4_1 */
+
#ifdef CONFIG_DEBUG_LOCK_ALLOC
static struct lock_class_key svc_key[2];
static struct lock_class_key svc_slock_key[2];
@@ -1184,6 +1191,57 @@ static struct svc_xprt *svc_tcp_create(struct svc_serv *serv,
return svc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags);
}
+#if defined(CONFIG_NFS_V4_1)
+static struct svc_xprt *svc_bc_create_socket(struct svc_serv *, int,
+ struct net *, struct sockaddr *,
+ int, int);
+static void svc_bc_sock_free(struct svc_xprt *xprt);
+
+static struct svc_xprt *svc_bc_tcp_create(struct svc_serv *serv,
+ struct net *net,
+ struct sockaddr *sa, int salen,
+ int flags)
+{
+ return svc_bc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags);
+}
+
+static void svc_bc_tcp_sock_detach(struct svc_xprt *xprt)
+{
+}
+
+static struct svc_xprt_ops svc_tcp_bc_ops = {
+ .xpo_create = svc_bc_tcp_create,
+ .xpo_detach = svc_bc_tcp_sock_detach,
+ .xpo_free = svc_bc_sock_free,
+ .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr,
+};
+
+static struct svc_xprt_class svc_tcp_bc_class = {
+ .xcl_name = "tcp-bc",
+ .xcl_owner = THIS_MODULE,
+ .xcl_ops = &svc_tcp_bc_ops,
+ .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP,
+};
+
+static void svc_init_bc_xprt_sock(void)
+{
+ svc_reg_xprt_class(&svc_tcp_bc_class);
+}
+
+static void svc_cleanup_bc_xprt_sock(void)
+{
+ svc_unreg_xprt_class(&svc_tcp_bc_class);
+}
+#else /* CONFIG_NFS_V4_1 */
+static void svc_init_bc_xprt_sock(void)
+{
+}
+
+static void svc_cleanup_bc_xprt_sock(void)
+{
+}
+#endif /* CONFIG_NFS_V4_1 */
+
static struct svc_xprt_ops svc_tcp_ops = {
.xpo_create = svc_tcp_create,
.xpo_recvfrom = svc_tcp_recvfrom,
@@ -1207,12 +1265,14 @@ void svc_init_xprt_sock(void)
{
svc_reg_xprt_class(&svc_tcp_class);
svc_reg_xprt_class(&svc_udp_class);
+ svc_init_bc_xprt_sock();
}
void svc_cleanup_xprt_sock(void)
{
svc_unreg_xprt_class(&svc_tcp_class);
svc_unreg_xprt_class(&svc_udp_class);
+ svc_cleanup_bc_xprt_sock();
}
static void svc_tcp_init(struct svc_sock *svsk, struct svc_serv *serv)
@@ -1509,41 +1569,45 @@ static void svc_sock_free(struct svc_xprt *xprt)
kfree(svsk);
}
+#if defined(CONFIG_NFS_V4_1)
/*
- * Create a svc_xprt.
- *
- * For internal use only (e.g. nfsv4.1 backchannel).
- * Callers should typically use the xpo_create() method.
+ * Create a back channel svc_xprt which shares the fore channel socket.
*/
-struct svc_xprt *svc_sock_create(struct svc_serv *serv, int prot)
+static struct svc_xprt *svc_bc_create_socket(struct svc_serv *serv,
+ int protocol,
+ struct net *net,
+ struct sockaddr *sin, int len,
+ int flags)
{
struct svc_sock *svsk;
- struct svc_xprt *xprt = NULL;
+ struct svc_xprt *xprt;
+
+ if (protocol != IPPROTO_TCP) {
+ printk(KERN_WARNING "svc: only TCP sockets"
+ " supported on shared back channel\n");
+ return ERR_PTR(-EINVAL);
+ }
- dprintk("svc: %s\n", __func__);
svsk = kzalloc(sizeof(*svsk), GFP_KERNEL);
if (!svsk)
- goto out;
+ return ERR_PTR(-ENOMEM);
xprt = &svsk->sk_xprt;
- if (prot == IPPROTO_TCP)
- svc_xprt_init(&svc_tcp_class, xprt, serv);
- else if (prot == IPPROTO_UDP)
- svc_xprt_init(&svc_udp_class, xprt, serv);
- else
- BUG();
-out:
- dprintk("svc: %s return %p\n", __func__, xprt);
+ svc_xprt_init(&svc_tcp_bc_class, xprt, serv);
+
+ serv->sv_bc_xprt = xprt;
+
return xprt;
}
-EXPORT_SYMBOL_GPL(svc_sock_create);
/*
- * Destroy a svc_sock.
+ * Free a back channel svc_sock.
*/
-void svc_sock_destroy(struct svc_xprt *xprt)
+static void svc_bc_sock_free(struct svc_xprt *xprt)
{
- if (xprt)
+ if (xprt) {
+ kfree(xprt->xpt_bc_sid);
kfree(container_of(xprt, struct svc_sock, sk_xprt));
+ }
}
-EXPORT_SYMBOL_GPL(svc_sock_destroy);
+#endif /* CONFIG_NFS_V4_1 */
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