NFS: Store the credential of the mount process in the nfs_server

Store the credential of the mount process so that we can determine
information such as the user namespace.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

fs/nfs/client.c

@@ -500,7 +500,7 @@ int nfs_create_rpc_client(struct nfs_client *clp,
 		.program	= &nfs_program,
 		.version	= clp->rpc_ops->version,
 		.authflavor	= flavor,
-		.cred		= current_cred(),
+		.cred		= cl_init->cred,
 	};
 
 	if (test_bit(NFS_CS_DISCRTRY, &clp->cl_flags))
@@ -655,6 +655,7 @@ static int nfs_init_server(struct nfs_server *server,
 		.proto = data->nfs_server.protocol,
 		.net = data->net,
 		.timeparms = &timeparms,
+		.cred = server->cred,
 	};
 	struct nfs_client *clp;
 	int error;
@@ -923,6 +924,7 @@ void nfs_free_server(struct nfs_server *server)
 	ida_destroy(&server->lockowner_id);
 	ida_destroy(&server->openowner_id);
 	nfs_free_iostats(server->io_stats);
+	put_cred(server->cred);
 	kfree(server);
 	nfs_release_automount_timer();
 }
@@ -943,6 +945,8 @@ struct nfs_server *nfs_create_server(struct nfs_mount_info *mount_info,
 	if (!server)
 		return ERR_PTR(-ENOMEM);
 
+	server->cred = get_cred(current_cred());
+
 	error = -ENOMEM;
 	fattr = nfs_alloc_fattr();
 	if (fattr == NULL)
@@ -1009,6 +1013,8 @@ struct nfs_server *nfs_clone_server(struct nfs_server *source,
 	if (!server)
 		return ERR_PTR(-ENOMEM);
 
+	server->cred = get_cred(source->cred);
+
 	error = -ENOMEM;
 	fattr_fsinfo = nfs_alloc_fattr();
 	if (fattr_fsinfo == NULL)

fs/nfs/internal.h

@@ -84,6 +84,7 @@ struct nfs_client_initdata {
 	u32 minorversion;
 	struct net *net;
 	const struct rpc_timeout *timeparms;
+	const struct cred *cred;
 };
 
 /*

fs/nfs/nfs3client.c

@@ -91,6 +91,7 @@ struct nfs_client *nfs3_set_ds_client(struct nfs_server *mds_srv,
 		.proto = ds_proto,
 		.net = mds_clp->cl_net,
 		.timeparms = &ds_timeout,
+		.cred = mds_srv->cred,
 	};
 	struct nfs_client *clp;
 	char buf[INET6_ADDRSTRLEN + 1];

fs/nfs/nfs4client.c

@@ -870,6 +870,7 @@ static int nfs4_set_client(struct nfs_server *server,
 		.minorversion = minorversion,
 		.net = net,
 		.timeparms = timeparms,
+		.cred = server->cred,
 	};
 	struct nfs_client *clp;
 
@@ -931,6 +932,7 @@ struct nfs_client *nfs4_set_ds_client(struct nfs_server *mds_srv,
 		.minorversion = minor_version,
 		.net = mds_clp->cl_net,
 		.timeparms = &ds_timeout,
+		.cred = mds_srv->cred,
 	};
 	char buf[INET6_ADDRSTRLEN + 1];
 
@@ -1107,6 +1109,8 @@ struct nfs_server *nfs4_create_server(struct nfs_mount_info *mount_info,
 	if (!server)
 		return ERR_PTR(-ENOMEM);
 
+	server->cred = get_cred(current_cred());
+
 	auth_probe = mount_info->parsed->auth_info.flavor_len < 1;
 
 	/* set up the general RPC client */
@@ -1143,6 +1147,8 @@ struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data,
 	parent_server = NFS_SB(data->sb);
 	parent_client = parent_server->nfs_client;
 
+	server->cred = get_cred(parent_server->cred);
+
 	/* Initialise the client representation from the parent server */
 	nfs_server_copy_userdata(server, parent_server);
 

include/linux/nfs_fs_sb.h

@@ -241,6 +241,9 @@ struct nfs_server {
 
 	/* XDR related information */
 	unsigned int		read_hdrsize;
+
+	/* User namespace info */
+	const struct cred	*cred;
 };
 
 /* Server capabilities */