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1 /*
2  * linux/fs/nfs/callback.h
3  *
4  * Copyright (C) 2004 Trond Myklebust
5  *
6  * NFSv4 callback definitions
7  */
8 #ifndef __LINUX_FS_NFS_CALLBACK_H
9 #define __LINUX_FS_NFS_CALLBACK_H
10
11 #define NFS4_CALLBACK 0x40000000
12 #define NFS4_CALLBACK_XDRSIZE 2048
13 #define NFS4_CALLBACK_BUFSIZE (1024 + NFS4_CALLBACK_XDRSIZE)
14
15 enum nfs4_callback_procnum {
16         CB_NULL = 0,
17         CB_COMPOUND = 1,
18 };
19
20 enum nfs4_callback_opnum {
21         OP_CB_GETATTR = 3,
22         OP_CB_RECALL  = 4,
23 /* Callback operations new to NFSv4.1 */
24         OP_CB_LAYOUTRECALL  = 5,
25         OP_CB_NOTIFY        = 6,
26         OP_CB_PUSH_DELEG    = 7,
27         OP_CB_RECALL_ANY    = 8,
28         OP_CB_RECALLABLE_OBJ_AVAIL = 9,
29         OP_CB_RECALL_SLOT   = 10,
30         OP_CB_SEQUENCE      = 11,
31         OP_CB_WANTS_CANCELLED = 12,
32         OP_CB_NOTIFY_LOCK   = 13,
33         OP_CB_NOTIFY_DEVICEID = 14,
34         OP_CB_ILLEGAL = 10044,
35 };
36
37 struct cb_compound_hdr_arg {
38         unsigned int taglen;
39         const char *tag;
40         unsigned int minorversion;
41         unsigned nops;
42 };
43
44 struct cb_compound_hdr_res {
45         __be32 *status;
46         unsigned int taglen;
47         const char *tag;
48         __be32 *nops;
49 };
50
51 struct cb_getattrargs {
52         struct sockaddr *addr;
53         struct nfs_fh fh;
54         uint32_t bitmap[2];
55 };
56
57 struct cb_getattrres {
58         __be32 status;
59         uint32_t bitmap[2];
60         uint64_t size;
61         uint64_t change_attr;
62         struct timespec ctime;
63         struct timespec mtime;
64 };
65
66 struct cb_recallargs {
67         struct sockaddr *addr;
68         struct nfs_fh fh;
69         nfs4_stateid stateid;
70         uint32_t truncate;
71 };
72
73 #if defined(CONFIG_NFS_V4_1)
74
75 struct referring_call {
76         uint32_t                        rc_sequenceid;
77         uint32_t                        rc_slotid;
78 };
79
80 struct referring_call_list {
81         struct nfs4_sessionid           rcl_sessionid;
82         uint32_t                        rcl_nrefcalls;
83         struct referring_call           *rcl_refcalls;
84 };
85
86 struct cb_sequenceargs {
87         struct sockaddr                 *csa_addr;
88         struct nfs4_sessionid           csa_sessionid;
89         uint32_t                        csa_sequenceid;
90         uint32_t                        csa_slotid;
91         uint32_t                        csa_highestslotid;
92         uint32_t                        csa_cachethis;
93         uint32_t                        csa_nrclists;
94         struct referring_call_list      *csa_rclists;
95 };
96
97 struct cb_sequenceres {
98         __be32                          csr_status;
99         struct nfs4_sessionid           csr_sessionid;
100         uint32_t                        csr_sequenceid;
101         uint32_t                        csr_slotid;
102         uint32_t                        csr_highestslotid;
103         uint32_t                        csr_target_highestslotid;
104 };
105
106 extern unsigned nfs4_callback_sequence(struct cb_sequenceargs *args,
107                                        struct cb_sequenceres *res);
108
109 extern int nfs41_validate_delegation_stateid(struct nfs_delegation *delegation,
110                                              const nfs4_stateid *stateid);
111
112 #define RCA4_TYPE_MASK_RDATA_DLG        0
113 #define RCA4_TYPE_MASK_WDATA_DLG        1
114
115 struct cb_recallanyargs {
116         struct sockaddr *craa_addr;
117         uint32_t        craa_objs_to_keep;
118         uint32_t        craa_type_mask;
119 };
120
121 extern unsigned nfs4_callback_recallany(struct cb_recallanyargs *args, void *dummy);
122
123 struct cb_recallslotargs {
124         struct sockaddr *crsa_addr;
125         uint32_t        crsa_target_max_slots;
126 };
127 extern unsigned nfs4_callback_recallslot(struct cb_recallslotargs *args,
128                                           void *dummy);
129
130 #endif /* CONFIG_NFS_V4_1 */
131
132 extern __be32 nfs4_callback_getattr(struct cb_getattrargs *args, struct cb_getattrres *res);
133 extern __be32 nfs4_callback_recall(struct cb_recallargs *args, void *dummy);
134
135 #ifdef CONFIG_NFS_V4
136 extern int nfs_callback_up(u32 minorversion, struct rpc_xprt *xprt);
137 extern void nfs_callback_down(int minorversion);
138 extern int nfs4_validate_delegation_stateid(struct nfs_delegation *delegation,
139                                             const nfs4_stateid *stateid);
140 #endif /* CONFIG_NFS_V4 */
141 /*
142  * nfs41: Callbacks are expected to not cause substantial latency,
143  * so we limit their concurrency to 1 by setting up the maximum number
144  * of slots for the backchannel.
145  */
146 #define NFS41_BC_MIN_CALLBACKS 1
147 #define NFS41_BC_MAX_CALLBACKS 1
148
149 extern unsigned int nfs_callback_set_tcpport;
150 extern unsigned short nfs_callback_tcpport;
151 extern unsigned short nfs_callback_tcpport6;
152
153 #endif /* __LINUX_FS_NFS_CALLBACK_H */