fs/nfs/nfs3client.c

   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  */
  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
  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
  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
  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  */
  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                 rpc_authflavor_t au_flavor)
  83 {
  84         struct rpc_timeout ds_timeout;
  85         struct nfs_client *mds_clp = mds_srv->nfs_client;
  86         struct nfs_client_initdata cl_init = {
  87                 .addr = ds_addr,
  88                 .addrlen = ds_addrlen,
  89                 .nodename = mds_clp->cl_rpcclient->cl_nodename,
  90                 .ip_addr = mds_clp->cl_ipaddr,
  91                 .nfs_mod = &nfs_v3,
  92                 .proto = ds_proto,
  93                 .net = mds_clp->cl_net,
  94                 .timeparms = &ds_timeout,
  95         };
  96         struct nfs_client *clp;
  97         char buf[INET6_ADDRSTRLEN + 1];
  98
  99         /* fake a hostname because lockd wants it */
 100         if (rpc_ntop(ds_addr, buf, sizeof(buf)) <= 0)
 101                 return ERR_PTR(-EINVAL);
 102         cl_init.hostname = buf;
 103
 104         if (mds_srv->flags & NFS_MOUNT_NORESVPORT)
 105                 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
 106
 107         /* Use the MDS nfs_client cl_ipaddr. */
 108         nfs_init_timeout_values(&ds_timeout, ds_proto, ds_timeo, ds_retrans);
 109         clp = nfs_get_client(&cl_init, au_flavor);
 110
 111         return clp;
 112 }
 113 EXPORT_SYMBOL_GPL(nfs3_set_ds_client);