nfsv3: introduce nfs3_set_ds_client
The flexfiles layout wants to create DS connection over NFSv3.
Add nfs3_set_ds_client to allow that to happen.
Signed-off-by: Peng Tao <tao.peng@primarydata.com>
Signed-off-by: Tom Haynes <Thomas.Haynes@primarydata.com>
diff --git a/fs/nfs/nfs3client.c b/fs/nfs/nfs3client.c
index 8c1b437..52e2344 100644
--- a/fs/nfs/nfs3client.c
+++ b/fs/nfs/nfs3client.c
@@ -64,3 +64,37 @@
nfs_init_server_aclclient(server);
return server;
}
+
+/*
+ * Set up a pNFS Data Server client over NFSv3.
+ *
+ * Return any existing nfs_client that matches server address,port,version
+ * and minorversion.
+ *
+ * For a new nfs_client, use a soft mount (default), a low retrans and a
+ * low timeout interval so that if a connection is lost, we retry through
+ * the MDS.
+ */
+struct nfs_client *nfs3_set_ds_client(struct nfs_client *mds_clp,
+ const struct sockaddr *ds_addr, int ds_addrlen,
+ int ds_proto, unsigned int ds_timeo, unsigned int ds_retrans,
+ rpc_authflavor_t au_flavor)
+{
+ struct nfs_client_initdata cl_init = {
+ .addr = ds_addr,
+ .addrlen = ds_addrlen,
+ .nfs_mod = &nfs_v3,
+ .proto = ds_proto,
+ .net = mds_clp->cl_net,
+ };
+ struct rpc_timeout ds_timeout;
+ struct nfs_client *clp;
+
+ /* Use the MDS nfs_client cl_ipaddr. */
+ nfs_init_timeout_values(&ds_timeout, ds_proto, ds_timeo, ds_retrans);
+ clp = nfs_get_client(&cl_init, &ds_timeout, mds_clp->cl_ipaddr,
+ au_flavor);
+
+ return clp;
+}
+EXPORT_SYMBOL_GPL(nfs3_set_ds_client);