pnfs/NFSv4.1: Add multipath capabilities to pNFS flexfiles servers over NFSv3

[linux-2.6-block.git] / fs / nfs / nfs4proc.c

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 4bfc33ad05637f58f9f0b675f058fd90085d4271..36471e013a738ea89da25054f5791e75b6a51b97 100644 (file)
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -6783,12 +6783,16 @@ nfs41_same_server_scope(struct nfs41_server_scope *a,
 }
 
 /*
- * nfs4_proc_bind_conn_to_session()
+ * nfs4_proc_bind_one_conn_to_session()
  *
  * The 4.1 client currently uses the same TCP connection for the
  * fore and backchannel.
  */
-int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
+static
+int nfs4_proc_bind_one_conn_to_session(struct rpc_clnt *clnt,
+               struct rpc_xprt *xprt,
+               struct nfs_client *clp,
+               struct rpc_cred *cred)
 {
        int status;
        struct nfs41_bind_conn_to_session_args args = {
@@ -6803,6 +6807,13 @@ int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred
                .rpc_resp = &res,
                .rpc_cred = cred,
        };
+       struct rpc_task_setup task_setup_data = {
+               .rpc_client = clnt,
+               .rpc_xprt = xprt,
+               .rpc_message = &msg,
+               .flags = RPC_TASK_TIMEOUT,
+       };
+       struct rpc_task *task;
 
        dprintk("--> %s\n", __func__);
 
@@ -6810,7 +6821,16 @@ int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred
        if (!(clp->cl_session->flags & SESSION4_BACK_CHAN))
                args.dir = NFS4_CDFC4_FORE;
 
-       status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
+       /* Do not set the backchannel flag unless this is clnt->cl_xprt */
+       if (xprt != rcu_access_pointer(clnt->cl_xprt))
+               args.dir = NFS4_CDFC4_FORE;
+
+       task = rpc_run_task(&task_setup_data);
+       if (!IS_ERR(task)) {
+               status = task->tk_status;
+               rpc_put_task(task);
+       } else
+               status = PTR_ERR(task);
        trace_nfs4_bind_conn_to_session(clp, status);
        if (status == 0) {
                if (memcmp(res.sessionid.data,
@@ -6837,6 +6857,31 @@ out:
        return status;
 }
 
+struct rpc_bind_conn_calldata {
+       struct nfs_client *clp;
+       struct rpc_cred *cred;
+};
+
+static int
+nfs4_proc_bind_conn_to_session_callback(struct rpc_clnt *clnt,
+               struct rpc_xprt *xprt,
+               void *calldata)
+{
+       struct rpc_bind_conn_calldata *p = calldata;
+
+       return nfs4_proc_bind_one_conn_to_session(clnt, xprt, p->clp, p->cred);
+}
+
+int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
+{
+       struct rpc_bind_conn_calldata data = {
+               .clp = clp,
+               .cred = cred,
+       };
+       return rpc_clnt_iterate_for_each_xprt(clp->cl_rpcclient,
+                       nfs4_proc_bind_conn_to_session_callback, &data);
+}
+
 /*
  * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map
  * and operations we'd like to see to enable certain features in the allow map