NFS: Save the value of the "port=" mount option
During a remount based on the mount options displayed in /proc/mounts, we
want to preserve the original behavior of the mount request. Let's save
the original setting of the "port=" mount option in the mount's nfs_server
structure.
This allows us to simplify the default behavior of port setting for NFSv4
mounts: by default, NFSv2/3 mounts first try an RPC bind to determine the
NFS server's port, unless the user specified the "port=" mount option;
Users can force the client to skip the RPC bind by explicitly specifying
"port=<value>".
NFSv4, by contrast, assumes the NFS server port is 2049 and skips the RPC
bind, unless the user specifies "port=". Users can force an RPC bind for
NFSv4 by explicitly specifying "port=0".
I added a couple of extra comments to clarify this behavior.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Cc: Miklos Szeredi <miklos@szeredi.hu>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/nfs/client.c b/fs/nfs/client.c
index 06f064d..8740181 100644
--- a/fs/nfs/client.c
+++ b/fs/nfs/client.c
@@ -682,6 +682,8 @@
if (error < 0)
goto error;
+ server->port = data->nfs_server.port;
+
error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
if (error < 0)
goto error;
@@ -1064,6 +1066,8 @@
server->acdirmin = data->acdirmin * HZ;
server->acdirmax = data->acdirmax * HZ;
+ server->port = data->nfs_server.port;
+
error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
error: