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authorChuck Lever <chuck.lever@oracle.com>2017-12-04 14:13:38 -0500
committerTrond Myklebust <trond.myklebust@primarydata.com>2018-01-14 23:06:30 -0500
commit530ea4219231e62341f79a5517d7b4f12ec3b74f (patch)
treee0998b983e33b87a37627a9b2d42ff45facee9ea /fs/nfs/nfs4client.c
parentfb455baad6fc4de77d762e89dae75c2e2aa98559 (diff)
nfs: Referrals should use the same proto setting as their parent
Helen Chao <helen.chao@oracle.com> noticed that when a user traverses a referral on an NFS/RDMA mount, the resulting submount always uses TCP. This behavior does not match the vers= setting when traversing a referral (vers=4.1 is preserved). It also does not match the behavior of crossing from the pseudofs into a real filesystem (proto=rdma is preserved in that case). The Linux NFS client does not currently support the fs_locations_info attribute. The situation is similar for all NFSv4 servers I know of. Therefore until the community has broad support for fs_locations_info, when following a referral: - First try to connect with RPC-over-RDMA. This will fail quickly if the client has no RDMA-capable interfaces. - If connecting with RPC-over-RDMA fails, or the RPC-over-RDMA transport is not available, use TCP. Reported-by: Helen Chao <helen.chao@oracle.com> Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Diffstat (limited to 'fs/nfs/nfs4client.c')
-rw-r--r--fs/nfs/nfs4client.c23
1 files changed, 20 insertions, 3 deletions
diff --git a/fs/nfs/nfs4client.c b/fs/nfs/nfs4client.c
index 65a7e5da508c..507f1f534b16 100644
--- a/fs/nfs/nfs4client.c
+++ b/fs/nfs/nfs4client.c
@@ -1123,19 +1123,36 @@ struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data,
/* Initialise the client representation from the parent server */
nfs_server_copy_userdata(server, parent_server);
- /* Get a client representation.
- * Note: NFSv4 always uses TCP, */
+ /* Get a client representation */
+#ifdef CONFIG_SUNRPC_XPRT_RDMA
+ rpc_set_port(data->addr, NFS_RDMA_PORT);
error = nfs4_set_client(server, data->hostname,
data->addr,
data->addrlen,
parent_client->cl_ipaddr,
- rpc_protocol(parent_server->client),
+ XPRT_TRANSPORT_RDMA,
+ parent_server->client->cl_timeout,
+ parent_client->cl_mvops->minor_version,
+ parent_client->cl_net);
+ if (!error)
+ goto init_server;
+#endif /* CONFIG_SUNRPC_XPRT_RDMA */
+
+ rpc_set_port(data->addr, NFS_PORT);
+ error = nfs4_set_client(server, data->hostname,
+ data->addr,
+ data->addrlen,
+ parent_client->cl_ipaddr,
+ XPRT_TRANSPORT_TCP,
parent_server->client->cl_timeout,
parent_client->cl_mvops->minor_version,
parent_client->cl_net);
if (error < 0)
goto error;
+#ifdef CONFIG_SUNRPC_XPRT_RDMA
+init_server:
+#endif
error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor);
if (error < 0)
goto error;