SUNRPC: RPC client should retry with different versions of rpcbind
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/Kconfig b/fs/Kconfig
index a42f767..20bec77 100644
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -1734,6 +1734,18 @@
config SUNRPC_GSS
tristate
+config SUNRPC_BIND34
+ bool "Support for rpcbind versions 3 & 4 (EXPERIMENTAL)"
+ depends on SUNRPC && EXPERIMENTAL
+ help
+ Provides kernel support for querying rpcbind servers via versions 3
+ and 4 of the rpcbind protocol. The kernel automatically falls back
+ to version 2 if a remote rpcbind service does not support versions
+ 3 or 4.
+
+ If unsure, say N to get traditional behavior (version 2 rpcbind
+ requests only).
+
config RPCSEC_GSS_KRB5
tristate "Secure RPC: Kerberos V mechanism (EXPERIMENTAL)"
depends on SUNRPC && EXPERIMENTAL
diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c
index e7dc09e..d8fbee4 100644
--- a/net/sunrpc/clnt.c
+++ b/net/sunrpc/clnt.c
@@ -902,9 +902,11 @@
task->tk_pid);
break;
case -EPROTONOSUPPORT:
- dprintk("RPC: %5u remote rpcbind version 2 unavailable\n",
+ dprintk("RPC: %5u remote rpcbind version unavailable, retrying\n",
task->tk_pid);
- break;
+ task->tk_status = 0;
+ task->tk_action = call_bind;
+ return;
default:
dprintk("RPC: %5u unrecognized rpcbind error (%d)\n",
task->tk_pid, -task->tk_status);