fs/nfs/nfs3client.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 #include <linux/nfs_fs.h>
   3 #include <linux/nfs_mount.h>
   4 #include <linux/sunrpc/addr.h>
   5 #include "internal.h"
   6 #include "nfs3_fs.h"
   7
   8 #ifdef CONFIG_NFS_V3_ACL
   9 static struct rpc_stat          nfsacl_rpcstat = { &nfsacl_program };
  10 static const struct rpc_version *nfsacl_version[] = {
  11         [3]                     = &nfsacl_version3,
  12 };
  13
  14 const struct rpc_program nfsacl_program = {
  15         .name                   = "nfsacl",
  16         .number                 = NFS_ACL_PROGRAM,
  17         .nrvers                 = ARRAY_SIZE(nfsacl_version),
  18         .version                = nfsacl_version,
  19         .stats                  = &nfsacl_rpcstat,
  20 };
  21
  22 /*
  23  * Initialise an NFSv3 ACL client connection
  24  */
  25 static void nfs_init_server_aclclient(struct nfs_server *server)
  26 {
  27         if (server->flags & NFS_MOUNT_NOACL)
  28                 goto out_noacl;
  29
  30         server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3);
  31         if (IS_ERR(server->client_acl))
  32                 goto out_noacl;
  33
  34         /* No errors! Assume that Sun nfsacls are supported */
  35         server->caps |= NFS_CAP_ACLS;
  36         return;
  37
  38 out_noacl:
  39         server->caps &= ~NFS_CAP_ACLS;
  40 }
  41 #else
  42 static inline void nfs_init_server_aclclient(struct nfs_server *server)
  43 {
  44         server->flags &= ~NFS_MOUNT_NOACL;
  45         server->caps &= ~NFS_CAP_ACLS;
  46 }
  47 #endif
  48
  49 struct nfs_server *nfs3_create_server(struct fs_context *fc)
  50 {
  51         struct nfs_server *server = nfs_create_server(fc);
  52
  53         /* Create a client RPC handle for the NFS v3 ACL management interface */
  54         if (!IS_ERR(server))
  55                 nfs_init_server_aclclient(server);
  56         return server;
  57 }
  58
  59 struct nfs_server *nfs3_clone_server(struct nfs_server *source,
  60                                      struct nfs_fh *fh,
  61                                      struct nfs_fattr *fattr,
  62                                      rpc_authflavor_t flavor)
  63 {
  64         struct nfs_server *server = nfs_clone_server(source, fh, fattr, flavor);
  65         if (!IS_ERR(server) && !IS_ERR(source->client_acl))
  66                 nfs_init_server_aclclient(server);
  67         return server;
  68 }
  69
  70 /*
  71  * Set up a pNFS Data Server client over NFSv3.
  72  *
  73  * Return any existing nfs_client that matches server address,port,version
  74  * and minorversion.
  75  *
  76  * For a new nfs_client, use a soft mount (default), a low retrans and a
  77  * low timeout interval so that if a connection is lost, we retry through
  78  * the MDS.
  79  */
  80 struct nfs_client *nfs3_set_ds_client(struct nfs_server *mds_srv,
  81                 const struct sockaddr *ds_addr, int ds_addrlen,
  82                 int ds_proto, unsigned int ds_timeo, unsigned int ds_retrans)
  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                 .cred = mds_srv->cred,
  96         };
  97         struct nfs_client *clp;
  98         char buf[INET6_ADDRSTRLEN + 1];
  99
 100         /* fake a hostname because lockd wants it */
 101         if (rpc_ntop(ds_addr, buf, sizeof(buf)) <= 0)
 102                 return ERR_PTR(-EINVAL);
 103         cl_init.hostname = buf;
 104
 105         if (mds_clp->cl_nconnect > 1 && ds_proto == XPRT_TRANSPORT_TCP)
 106                 cl_init.nconnect = mds_clp->cl_nconnect;
 107
 108         if (mds_srv->flags & NFS_MOUNT_NORESVPORT)
 109                 __set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
 110
 111         __set_bit(NFS_CS_NOPING, &cl_init.init_flags);
 112         __set_bit(NFS_CS_DS, &cl_init.init_flags);
 113
 114         /* Use the MDS nfs_client cl_ipaddr. */
 115         nfs_init_timeout_values(&ds_timeout, ds_proto, ds_timeo, ds_retrans);
 116         clp = nfs_get_client(&cl_init);
 117
 118         return clp;
 119 }
 120 EXPORT_SYMBOL_GPL(nfs3_set_ds_client);