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nfs: Referrals should use the same proto setting as their parent

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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>
This commit is contained in:
Chuck Lever 2017-12-04 14:13:38 -05:00 committed by Trond Myklebust
parent fb455baad6
commit 530ea42192
2 changed files with 20 additions and 5 deletions
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23
fs/nfs/nfs4client.c
View File

@ -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;

2
fs/nfs/nfs4namespace.c
View File

@ -270,8 +270,6 @@ static struct vfsmount *try_location(struct nfs_clone_mount *mountdata,
if (mountdata->addrlen == 0)
continue;
rpc_set_port(mountdata->addr, NFS_PORT);
memcpy(page2, buf->data, buf->len);
page2[buf->len] = '\0';
mountdata->hostname = page2;