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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#include <linux/sunrpc/svc.h>
11
12#define NFS4_CALLBACK 0x40000000
13#define NFS4_CALLBACK_XDRSIZE 2048
14#define NFS4_CALLBACK_BUFSIZE (1024 + NFS4_CALLBACK_XDRSIZE)
15
16enum nfs4_callback_procnum {
17 CB_NULL = 0,
18 CB_COMPOUND = 1,
19};
20
21enum nfs4_callback_opnum {
22 OP_CB_GETATTR = 3,
23 OP_CB_RECALL = 4,
24/* Callback operations new to NFSv4.1 */
25 OP_CB_LAYOUTRECALL = 5,
26 OP_CB_NOTIFY = 6,
27 OP_CB_PUSH_DELEG = 7,
28 OP_CB_RECALL_ANY = 8,
29 OP_CB_RECALLABLE_OBJ_AVAIL = 9,
30 OP_CB_RECALL_SLOT = 10,
31 OP_CB_SEQUENCE = 11,
32 OP_CB_WANTS_CANCELLED = 12,
33 OP_CB_NOTIFY_LOCK = 13,
34 OP_CB_NOTIFY_DEVICEID = 14,
35 OP_CB_ILLEGAL = 10044,
36};
37
38struct cb_process_state {
39 __be32 drc_status;
40 struct nfs_client *clp;
41 int slotid;
42};
43
44struct cb_compound_hdr_arg {
45 unsigned int taglen;
46 const char *tag;
47 unsigned int minorversion;
48 unsigned int cb_ident; /* v4.0 callback identifier */
49 unsigned nops;
50};
51
52struct cb_compound_hdr_res {
53 __be32 *status;
54 unsigned int taglen;
55 const char *tag;
56 __be32 *nops;
57};
58
59struct cb_getattrargs {
60 struct sockaddr *addr;
61 struct nfs_fh fh;
62 uint32_t bitmap[2];
63};
64
65struct cb_getattrres {
66 __be32 status;
67 uint32_t bitmap[2];
68 uint64_t size;
69 uint64_t change_attr;
70 struct timespec ctime;
71 struct timespec mtime;
72};
73
74struct cb_recallargs {
75 struct sockaddr *addr;
76 struct nfs_fh fh;
77 nfs4_stateid stateid;
78 uint32_t truncate;
79};
80
81#if defined(CONFIG_NFS_V4_1)
82
83struct referring_call {
84 uint32_t rc_sequenceid;
85 uint32_t rc_slotid;
86};
87
88struct referring_call_list {
89 struct nfs4_sessionid rcl_sessionid;
90 uint32_t rcl_nrefcalls;
91 struct referring_call *rcl_refcalls;
92};
93
94struct cb_sequenceargs {
95 struct sockaddr *csa_addr;
96 struct nfs4_sessionid csa_sessionid;
97 uint32_t csa_sequenceid;
98 uint32_t csa_slotid;
99 uint32_t csa_highestslotid;
100 uint32_t csa_cachethis;
101 uint32_t csa_nrclists;
102 struct referring_call_list *csa_rclists;
103};
104
105struct cb_sequenceres {
106 __be32 csr_status;
107 struct nfs4_sessionid csr_sessionid;
108 uint32_t csr_sequenceid;
109 uint32_t csr_slotid;
110 uint32_t csr_highestslotid;
111 uint32_t csr_target_highestslotid;
112};
113
114extern __be32 nfs4_callback_sequence(struct cb_sequenceargs *args,
115 struct cb_sequenceres *res,
116 struct cb_process_state *cps);
117
118extern int nfs41_validate_delegation_stateid(struct nfs_delegation *delegation,
119 const nfs4_stateid *stateid);
120
121#define RCA4_TYPE_MASK_RDATA_DLG 0
122#define RCA4_TYPE_MASK_WDATA_DLG 1
123#define RCA4_TYPE_MASK_DIR_DLG 2
124#define RCA4_TYPE_MASK_FILE_LAYOUT 3
125#define RCA4_TYPE_MASK_BLK_LAYOUT 4
126#define RCA4_TYPE_MASK_OBJ_LAYOUT_MIN 8
127#define RCA4_TYPE_MASK_OBJ_LAYOUT_MAX 9
128#define RCA4_TYPE_MASK_OTHER_LAYOUT_MIN 12
129#define RCA4_TYPE_MASK_OTHER_LAYOUT_MAX 15
130#define RCA4_TYPE_MASK_ALL 0xf31f
131
132struct cb_recallanyargs {
133 struct sockaddr *craa_addr;
134 uint32_t craa_objs_to_keep;
135 uint32_t craa_type_mask;
136};
137
138extern __be32 nfs4_callback_recallany(struct cb_recallanyargs *args,
139 void *dummy,
140 struct cb_process_state *cps);
141
142struct cb_recallslotargs {
143 struct sockaddr *crsa_addr;
144 uint32_t crsa_target_max_slots;
145};
146extern __be32 nfs4_callback_recallslot(struct cb_recallslotargs *args,
147 void *dummy,
148 struct cb_process_state *cps);
149
150struct cb_layoutrecallargs {
151 struct sockaddr *cbl_addr;
152 uint32_t cbl_recall_type;
153 uint32_t cbl_layout_type;
154 uint32_t cbl_layoutchanged;
155 union {
156 struct {
157 struct nfs_fh cbl_fh;
158 struct pnfs_layout_range cbl_range;
159 nfs4_stateid cbl_stateid;
160 };
161 struct nfs_fsid cbl_fsid;
162 };
163};
164
165extern __be32 nfs4_callback_layoutrecall(
166 struct cb_layoutrecallargs *args,
167 void *dummy, struct cb_process_state *cps);
168
169extern void nfs4_check_drain_bc_complete(struct nfs4_session *ses);
170
171struct cb_devicenotifyitem {
172 uint32_t cbd_notify_type;
173 uint32_t cbd_layout_type;
174 struct nfs4_deviceid cbd_dev_id;
175 uint32_t cbd_immediate;
176};
177
178struct cb_devicenotifyargs {
179 int ndevs;
180 struct cb_devicenotifyitem *devs;
181};
182
183extern __be32 nfs4_callback_devicenotify(
184 struct cb_devicenotifyargs *args,
185 void *dummy, struct cb_process_state *cps);
186
187#endif /* CONFIG_NFS_V4_1 */
188extern int check_gss_callback_principal(struct nfs_client *, struct svc_rqst *);
189extern __be32 nfs4_callback_getattr(struct cb_getattrargs *args,
190 struct cb_getattrres *res,
191 struct cb_process_state *cps);
192extern __be32 nfs4_callback_recall(struct cb_recallargs *args, void *dummy,
193 struct cb_process_state *cps);
194#ifdef CONFIG_NFS_V4
195extern int nfs_callback_up(u32 minorversion, struct rpc_xprt *xprt);
196extern void nfs_callback_down(int minorversion);
197extern int nfs4_validate_delegation_stateid(struct nfs_delegation *delegation,
198 const nfs4_stateid *stateid);
199extern int nfs4_set_callback_sessionid(struct nfs_client *clp);
200#endif /* CONFIG_NFS_V4 */
201/*
202 * nfs41: Callbacks are expected to not cause substantial latency,
203 * so we limit their concurrency to 1 by setting up the maximum number
204 * of slots for the backchannel.
205 */
206#define NFS41_BC_MIN_CALLBACKS 1
207#define NFS41_BC_MAX_CALLBACKS 1
208
209extern unsigned int nfs_callback_set_tcpport;
210extern unsigned short nfs_callback_tcpport;
211extern unsigned short nfs_callback_tcpport6;
212
213#endif /* __LINUX_FS_NFS_CALLBACK_H */