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authorChuck Lever <cel@netapp.com>2006-01-03 11:55:50 +0300
committerTrond Myklebust <Trond.Myklebust@netapp.com>2006-01-06 22:58:56 +0300
commit35f5a422ce1af836007f811b613c440d0e348e06 (patch)
tree25aac5cccce27a6ed5ebb4e161f813af2adbaf56
parent02107148349f31eee7c0fb06fd7a880df73dbd20 (diff)
downloadlinux-35f5a422ce1af836007f811b613c440d0e348e06.tar.xz
SUNRPC: new interface to force an RPC rebind
We'd like to hide fields in rpc_xprt and rpc_clnt from upper layer protocols. Start by creating an API to force RPC rebind, replacing logic that simply sets cl_port to zero. Test-plan: Destructive testing (unplugging the network temporarily). Connectathon with UDP and TCP. NFSv2/3 and NFSv4 mounting should be carefully checked. Probably need to rig a server where certain services aren't running, or that returns an error for some typical operation. Signed-off-by: Chuck Lever <cel@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
-rw-r--r--fs/lockd/host.c4
-rw-r--r--include/linux/sunrpc/clnt.h1
-rw-r--r--net/sunrpc/clnt.c21
3 files changed, 18 insertions, 8 deletions
diff --git a/fs/lockd/host.c b/fs/lockd/host.c
index c4c8601096e0..82f7a0b1d8ae 100644
--- a/fs/lockd/host.c
+++ b/fs/lockd/host.c
@@ -177,7 +177,7 @@ nlm_bind_host(struct nlm_host *host)
if ((clnt = host->h_rpcclnt) != NULL) {
xprt = clnt->cl_xprt;
if (time_after_eq(jiffies, host->h_nextrebind)) {
- clnt->cl_port = 0;
+ rpc_force_rebind(clnt);
host->h_nextrebind = jiffies + NLM_HOST_REBIND;
dprintk("lockd: next rebind in %ld jiffies\n",
host->h_nextrebind - jiffies);
@@ -217,7 +217,7 @@ nlm_rebind_host(struct nlm_host *host)
{
dprintk("lockd: rebind host %s\n", host->h_name);
if (host->h_rpcclnt && time_after_eq(jiffies, host->h_nextrebind)) {
- host->h_rpcclnt->cl_port = 0;
+ rpc_force_rebind(host->h_rpcclnt);
host->h_nextrebind = jiffies + NLM_HOST_REBIND;
}
}
diff --git a/include/linux/sunrpc/clnt.h b/include/linux/sunrpc/clnt.h
index b0ab959eca65..3d605765f84b 100644
--- a/include/linux/sunrpc/clnt.h
+++ b/include/linux/sunrpc/clnt.h
@@ -135,6 +135,7 @@ void rpc_clnt_sigmask(struct rpc_clnt *clnt, sigset_t *oldset);
void rpc_clnt_sigunmask(struct rpc_clnt *clnt, sigset_t *oldset);
void rpc_setbufsize(struct rpc_clnt *, unsigned int, unsigned int);
size_t rpc_max_payload(struct rpc_clnt *);
+void rpc_force_rebind(struct rpc_clnt *);
int rpc_ping(struct rpc_clnt *clnt, int flags);
static __inline__
diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c
index 25cba94c5683..2789d3083fe7 100644
--- a/net/sunrpc/clnt.c
+++ b/net/sunrpc/clnt.c
@@ -538,6 +538,18 @@ size_t rpc_max_payload(struct rpc_clnt *clnt)
}
EXPORT_SYMBOL(rpc_max_payload);
+/**
+ * rpc_force_rebind - force transport to check that remote port is unchanged
+ * @clnt: client to rebind
+ *
+ */
+void rpc_force_rebind(struct rpc_clnt *clnt)
+{
+ if (clnt->cl_autobind)
+ clnt->cl_port = 0;
+}
+EXPORT_SYMBOL(rpc_force_rebind);
+
/*
* Restart an (async) RPC call. Usually called from within the
* exit handler.
@@ -853,8 +865,7 @@ call_connect_status(struct rpc_task *task)
}
/* Something failed: remote service port may have changed */
- if (clnt->cl_autobind)
- clnt->cl_port = 0;
+ rpc_force_rebind(clnt);
switch (status) {
case -ENOTCONN:
@@ -935,8 +946,7 @@ call_status(struct rpc_task *task)
break;
case -ECONNREFUSED:
case -ENOTCONN:
- if (clnt->cl_autobind)
- clnt->cl_port = 0;
+ rpc_force_rebind(clnt);
task->tk_action = call_bind;
break;
case -EAGAIN:
@@ -995,8 +1005,7 @@ call_timeout(struct rpc_task *task)
printk(KERN_NOTICE "%s: server %s not responding, still trying\n",
clnt->cl_protname, clnt->cl_server);
}
- if (clnt->cl_autobind)
- clnt->cl_port = 0;
+ rpc_force_rebind(clnt);
retry:
clnt->cl_stats->rpcretrans++;