1 #include <linux/nfs_fs.h>
2 #include <linux/nfs_mount.h>
3 #include <linux/sunrpc/addr.h>
4 #include "internal.h"
5 #include "nfs3_fs.h"
6 
7 #ifdef CONFIG_NFS_V3_ACL
8 static struct rpc_stat		nfsacl_rpcstat = { &nfsacl_program };
9 static const struct rpc_version *nfsacl_version[] = {
10 	[3]			= &nfsacl_version3,
11 };
12 
13 const struct rpc_program nfsacl_program = {
14 	.name			= "nfsacl",
15 	.number			= NFS_ACL_PROGRAM,
16 	.nrvers			= ARRAY_SIZE(nfsacl_version),
17 	.version		= nfsacl_version,
18 	.stats			= &nfsacl_rpcstat,
19 };
20 
21 /*
22  * Initialise an NFSv3 ACL client connection
23  */
nfs_init_server_aclclient(struct nfs_server * server)24 static void nfs_init_server_aclclient(struct nfs_server *server)
25 {
26 	if (server->flags & NFS_MOUNT_NOACL)
27 		goto out_noacl;
28 
29 	server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3);
30 	if (IS_ERR(server->client_acl))
31 		goto out_noacl;
32 
33 	/* No errors! Assume that Sun nfsacls are supported */
34 	server->caps |= NFS_CAP_ACLS;
35 	return;
36 
37 out_noacl:
38 	server->caps &= ~NFS_CAP_ACLS;
39 }
40 #else
nfs_init_server_aclclient(struct nfs_server * server)41 static inline void nfs_init_server_aclclient(struct nfs_server *server)
42 {
43 	server->flags &= ~NFS_MOUNT_NOACL;
44 	server->caps &= ~NFS_CAP_ACLS;
45 }
46 #endif
47 
nfs3_create_server(struct nfs_mount_info * mount_info,struct nfs_subversion * nfs_mod)48 struct nfs_server *nfs3_create_server(struct nfs_mount_info *mount_info,
49 				      struct nfs_subversion *nfs_mod)
50 {
51 	struct nfs_server *server = nfs_create_server(mount_info, nfs_mod);
52 	/* Create a client RPC handle for the NFS v3 ACL management interface */
53 	if (!IS_ERR(server))
54 		nfs_init_server_aclclient(server);
55 	return server;
56 }
57 
nfs3_clone_server(struct nfs_server * source,struct nfs_fh * fh,struct nfs_fattr * fattr,rpc_authflavor_t flavor)58 struct nfs_server *nfs3_clone_server(struct nfs_server *source,
59 				     struct nfs_fh *fh,
60 				     struct nfs_fattr *fattr,
61 				     rpc_authflavor_t flavor)
62 {
63 	struct nfs_server *server = nfs_clone_server(source, fh, fattr, flavor);
64 	if (!IS_ERR(server) && !IS_ERR(source->client_acl))
65 		nfs_init_server_aclclient(server);
66 	return server;
67 }
68 
69 /*
70  * Set up a pNFS Data Server client over NFSv3.
71  *
72  * Return any existing nfs_client that matches server address,port,version
73  * and minorversion.
74  *
75  * For a new nfs_client, use a soft mount (default), a low retrans and a
76  * low timeout interval so that if a connection is lost, we retry through
77  * the MDS.
78  */
nfs3_set_ds_client(struct nfs_server * mds_srv,const struct sockaddr * ds_addr,int ds_addrlen,int ds_proto,unsigned int ds_timeo,unsigned int ds_retrans)79 struct nfs_client *nfs3_set_ds_client(struct nfs_server *mds_srv,
80 		const struct sockaddr *ds_addr, int ds_addrlen,
81 		int ds_proto, unsigned int ds_timeo, unsigned int ds_retrans)
82 {
83 	struct rpc_timeout ds_timeout;
84 	struct nfs_client *mds_clp = mds_srv->nfs_client;
85 	struct nfs_client_initdata cl_init = {
86 		.addr = ds_addr,
87 		.addrlen = ds_addrlen,
88 		.nodename = mds_clp->cl_rpcclient->cl_nodename,
89 		.ip_addr = mds_clp->cl_ipaddr,
90 		.nfs_mod = &nfs_v3,
91 		.proto = ds_proto,
92 		.net = mds_clp->cl_net,
93 		.timeparms = &ds_timeout,
94 	};
95 	struct nfs_client *clp;
96 	char buf[INET6_ADDRSTRLEN + 1];
97 
98 	/* fake a hostname because lockd wants it */
99 	if (rpc_ntop(ds_addr, buf, sizeof(buf)) <= 0)
100 		return ERR_PTR(-EINVAL);
101 	cl_init.hostname = buf;
102 
103 	if (mds_srv->flags & NFS_MOUNT_NORESVPORT)
104 		set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
105 
106 	/* Use the MDS nfs_client cl_ipaddr. */
107 	nfs_init_timeout_values(&ds_timeout, ds_proto, ds_timeo, ds_retrans);
108 	clp = nfs_get_client(&cl_init);
109 
110 	return clp;
111 }
112 EXPORT_SYMBOL_GPL(nfs3_set_ds_client);
113