NFS: Fix a delegation callback race
[linux-3.10.git] / fs / nfs / nfs3client.c
1 #include <linux/nfs_fs.h>
2 #include <linux/nfs_mount.h>
3 #include "internal.h"
4
5 #ifdef CONFIG_NFS_V3_ACL
6 static struct rpc_stat          nfsacl_rpcstat = { &nfsacl_program };
7 static const struct rpc_version *nfsacl_version[] = {
8         [3]                     = &nfsacl_version3,
9 };
10
11 const struct rpc_program nfsacl_program = {
12         .name                   = "nfsacl",
13         .number                 = NFS_ACL_PROGRAM,
14         .nrvers                 = ARRAY_SIZE(nfsacl_version),
15         .version                = nfsacl_version,
16         .stats                  = &nfsacl_rpcstat,
17 };
18
19 /*
20  * Initialise an NFSv3 ACL client connection
21  */
22 static void nfs_init_server_aclclient(struct nfs_server *server)
23 {
24         if (server->flags & NFS_MOUNT_NOACL)
25                 goto out_noacl;
26
27         server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3);
28         if (IS_ERR(server->client_acl))
29                 goto out_noacl;
30
31         /* No errors! Assume that Sun nfsacls are supported */
32         server->caps |= NFS_CAP_ACLS;
33         return;
34
35 out_noacl:
36         server->caps &= ~NFS_CAP_ACLS;
37 }
38 #else
39 static inline void nfs_init_server_aclclient(struct nfs_server *server)
40 {
41         server->flags &= ~NFS_MOUNT_NOACL;
42         server->caps &= ~NFS_CAP_ACLS;
43 }
44 #endif
45
46 struct nfs_server *nfs3_create_server(struct nfs_mount_info *mount_info,
47                                       struct nfs_subversion *nfs_mod)
48 {
49         struct nfs_server *server = nfs_create_server(mount_info, nfs_mod);
50         /* Create a client RPC handle for the NFS v3 ACL management interface */
51         if (!IS_ERR(server))
52                 nfs_init_server_aclclient(server);
53         return server;
54 }
55
56 struct nfs_server *nfs3_clone_server(struct nfs_server *source,
57                                      struct nfs_fh *fh,
58                                      struct nfs_fattr *fattr,
59                                      rpc_authflavor_t flavor)
60 {
61         struct nfs_server *server = nfs_clone_server(source, fh, fattr, flavor);
62         if (!IS_ERR(server) && !IS_ERR(source->client_acl))
63                 nfs_init_server_aclclient(server);
64         return server;
65 }