nfs4.1: add BIND_CONN_TO_SESSION operation

[linux-imx.git] / fs / nfs / nfs4proc.c

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index e725736ff2884ca2eb2e8008d1ac464a82d68fe7..e8988c000e7f8bd7b67835f7ad24a0044c18e44f 100644 (file)
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -5099,6 +5099,60 @@ nfs41_same_server_scope(struct nfs41_server_scope *a,
        return false;
 }
 
+/*
+ * nfs4_proc_bind_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)
+{
+       int status;
+       struct nfs41_bind_conn_to_session_res res;
+       struct rpc_message msg = {
+               .rpc_proc =
+                       &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
+               .rpc_argp = clp,
+               .rpc_resp = &res,
+       };
+
+       dprintk("--> %s\n", __func__);
+       BUG_ON(clp == NULL);
+
+       res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
+       if (unlikely(res.session == NULL)) {
+               status = -ENOMEM;
+               goto out;
+       }
+
+       status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
+       if (status == 0) {
+               if (memcmp(res.session->sess_id.data,
+                   clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
+                       dprintk("NFS: %s: Session ID mismatch\n", __func__);
+                       status = -EIO;
+                       goto out_session;
+               }
+               if (res.dir != NFS4_CDFS4_BOTH) {
+                       dprintk("NFS: %s: Unexpected direction from server\n",
+                               __func__);
+                       status = -EIO;
+                       goto out_session;
+               }
+               if (res.use_conn_in_rdma_mode) {
+                       dprintk("NFS: %s: Server returned RDMA mode = true\n",
+                               __func__);
+                       status = -EIO;
+                       goto out_session;
+               }
+       }
+out_session:
+       kfree(res.session);
+out:
+       dprintk("<-- %s status= %d\n", __func__, status);
+       return status;
+}
+
 /*
  * nfs4_proc_exchange_id()
  *