2 * linux/fs/nfs/callback.h
4 * Copyright (C) 2004 Trond Myklebust
6 * NFSv4 callback definitions
8 #ifndef __LINUX_FS_NFS_CALLBACK_H
9 #define __LINUX_FS_NFS_CALLBACK_H
11 #define NFS4_CALLBACK 0x40000000
12 #define NFS4_CALLBACK_XDRSIZE 2048
13 #define NFS4_CALLBACK_BUFSIZE (1024 + NFS4_CALLBACK_XDRSIZE)
15 enum nfs4_callback_procnum {
20 enum nfs4_callback_opnum {
23 /* Callback operations new to NFSv4.1 */
24 OP_CB_LAYOUTRECALL = 5,
28 OP_CB_RECALLABLE_OBJ_AVAIL = 9,
29 OP_CB_RECALL_SLOT = 10,
31 OP_CB_WANTS_CANCELLED = 12,
32 OP_CB_NOTIFY_LOCK = 13,
33 OP_CB_NOTIFY_DEVICEID = 14,
34 OP_CB_ILLEGAL = 10044,
37 struct cb_compound_hdr_arg {
40 unsigned int minorversion;
44 struct cb_compound_hdr_res {
51 struct cb_getattrargs {
52 struct sockaddr *addr;
57 struct cb_getattrres {
62 struct timespec ctime;
63 struct timespec mtime;
66 struct cb_recallargs {
67 struct sockaddr *addr;
73 #if defined(CONFIG_NFS_V4_1)
75 struct referring_call {
76 uint32_t rc_sequenceid;
80 struct referring_call_list {
81 struct nfs4_sessionid rcl_sessionid;
82 uint32_t rcl_nrefcalls;
83 struct referring_call *rcl_refcalls;
86 struct cb_sequenceargs {
87 struct sockaddr *csa_addr;
88 struct nfs4_sessionid csa_sessionid;
89 uint32_t csa_sequenceid;
91 uint32_t csa_highestslotid;
92 uint32_t csa_cachethis;
93 uint32_t csa_nrclists;
94 struct referring_call_list *csa_rclists;
97 struct cb_sequenceres {
99 struct nfs4_sessionid csr_sessionid;
100 uint32_t csr_sequenceid;
102 uint32_t csr_highestslotid;
103 uint32_t csr_target_highestslotid;
106 extern unsigned nfs4_callback_sequence(struct cb_sequenceargs *args,
107 struct cb_sequenceres *res);
109 #endif /* CONFIG_NFS_V4_1 */
111 extern __be32 nfs4_callback_getattr(struct cb_getattrargs *args, struct cb_getattrres *res);
112 extern __be32 nfs4_callback_recall(struct cb_recallargs *args, void *dummy);
115 extern int nfs_callback_up(u32 minorversion, struct rpc_xprt *xprt);
116 extern void nfs_callback_down(int minorversion);
117 #endif /* CONFIG_NFS_V4 */
120 * nfs41: Callbacks are expected to not cause substantial latency,
121 * so we limit their concurrency to 1 by setting up the maximum number
122 * of slots for the backchannel.
124 #define NFS41_BC_MIN_CALLBACKS 1
125 #define NFS41_BC_MAX_CALLBACKS 1
127 extern unsigned int nfs_callback_set_tcpport;
128 extern unsigned short nfs_callback_tcpport;
129 extern unsigned short nfs_callback_tcpport6;
131 #endif /* __LINUX_FS_NFS_CALLBACK_H */