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_ILLEGAL = 10044,
36 struct cb_compound_hdr_arg {
39 unsigned int minorversion;
43 struct cb_compound_hdr_res {
50 struct cb_getattrargs {
51 struct sockaddr *addr;
56 struct cb_getattrres {
61 struct timespec ctime;
62 struct timespec mtime;
65 struct cb_recallargs {
66 struct sockaddr *addr;
72 extern __be32 nfs4_callback_getattr(struct cb_getattrargs *args, struct cb_getattrres *res);
73 extern __be32 nfs4_callback_recall(struct cb_recallargs *args, void *dummy);
76 extern int nfs_callback_up(u32 minorversion, struct rpc_xprt *xprt);
77 extern void nfs_callback_down(int minorversion);
78 #endif /* CONFIG_NFS_V4 */
81 * nfs41: Callbacks are expected to not cause substantial latency,
82 * so we limit their concurrency to 1 by setting up the maximum number
83 * of slots for the backchannel.
85 #define NFS41_BC_MIN_CALLBACKS 1
87 extern unsigned int nfs_callback_set_tcpport;
88 extern unsigned short nfs_callback_tcpport;
89 extern unsigned short nfs_callback_tcpport6;
91 #endif /* __LINUX_FS_NFS_CALLBACK_H */