summaryrefslogtreecommitdiff
path: root/fs/nfs/callback.h
blob: c701c308fac52b16dc87d4b357d0b84f0627aa11 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
/*
 * linux/fs/nfs/callback.h
 *
 * Copyright (C) 2004 Trond Myklebust
 *
 * NFSv4 callback definitions
 */
#ifndef __LINUX_FS_NFS_CALLBACK_H
#define __LINUX_FS_NFS_CALLBACK_H
#include <linux/sunrpc/svc.h>

#define NFS4_CALLBACK 0x40000000
#define NFS4_CALLBACK_XDRSIZE 2048
#define NFS4_CALLBACK_BUFSIZE (1024 + NFS4_CALLBACK_XDRSIZE)

enum nfs4_callback_procnum {
	CB_NULL = 0,
	CB_COMPOUND = 1,
};

enum nfs4_callback_opnum {
	OP_CB_GETATTR = 3,
	OP_CB_RECALL  = 4,
/* Callback operations new to NFSv4.1 */
	OP_CB_LAYOUTRECALL  = 5,
	OP_CB_NOTIFY        = 6,
	OP_CB_PUSH_DELEG    = 7,
	OP_CB_RECALL_ANY    = 8,
	OP_CB_RECALLABLE_OBJ_AVAIL = 9,
	OP_CB_RECALL_SLOT   = 10,
	OP_CB_SEQUENCE      = 11,
	OP_CB_WANTS_CANCELLED = 12,
	OP_CB_NOTIFY_LOCK   = 13,
	OP_CB_NOTIFY_DEVICEID = 14,
/* Callback operations new to NFSv4.2 */
	OP_CB_OFFLOAD = 15,
	OP_CB_ILLEGAL = 10044,
};

struct nfs4_slot;
struct cb_process_state {
	__be32			drc_status;
	struct nfs_client	*clp;
	struct nfs4_slot	*slot;
	u32			minorversion;
	struct net		*net;
};

struct cb_compound_hdr_arg {
	unsigned int taglen;
	const char *tag;
	unsigned int minorversion;
	unsigned int cb_ident; /* v4.0 callback identifier */
	unsigned nops;
};

struct cb_compound_hdr_res {
	__be32 *status;
	unsigned int taglen;
	const char *tag;
	__be32 *nops;
};

struct cb_getattrargs {
	struct nfs_fh fh;
	uint32_t bitmap[2];
};

struct cb_getattrres {
	__be32 status;
	uint32_t bitmap[2];
	uint64_t size;
	uint64_t change_attr;
	struct timespec ctime;
	struct timespec mtime;
};

struct cb_recallargs {
	struct nfs_fh fh;
	nfs4_stateid stateid;
	uint32_t truncate;
};

#if defined(CONFIG_NFS_V4_1)

struct referring_call {
	uint32_t			rc_sequenceid;
	uint32_t			rc_slotid;
};

struct referring_call_list {
	struct nfs4_sessionid		rcl_sessionid;
	uint32_t			rcl_nrefcalls;
	struct referring_call 		*rcl_refcalls;
};

struct cb_sequenceargs {
	struct sockaddr			*csa_addr;
	struct nfs4_sessionid		csa_sessionid;
	uint32_t			csa_sequenceid;
	uint32_t			csa_slotid;
	uint32_t			csa_highestslotid;
	uint32_t			csa_cachethis;
	uint32_t			csa_nrclists;
	struct referring_call_list	*csa_rclists;
};

struct cb_sequenceres {
	__be32				csr_status;
	struct nfs4_sessionid		csr_sessionid;
	uint32_t			csr_sequenceid;
	uint32_t			csr_slotid;
	uint32_t			csr_highestslotid;
	uint32_t			csr_target_highestslotid;
};

extern __be32 nfs4_callback_sequence(struct cb_sequenceargs *args,
				       struct cb_sequenceres *res,
				       struct cb_process_state *cps);

#define RCA4_TYPE_MASK_RDATA_DLG	0
#define RCA4_TYPE_MASK_WDATA_DLG	1
#define RCA4_TYPE_MASK_DIR_DLG         2
#define RCA4_TYPE_MASK_FILE_LAYOUT     3
#define RCA4_TYPE_MASK_BLK_LAYOUT      4
#define RCA4_TYPE_MASK_OBJ_LAYOUT_MIN  8
#define RCA4_TYPE_MASK_OBJ_LAYOUT_MAX  9
#define RCA4_TYPE_MASK_OTHER_LAYOUT_MIN 12
#define RCA4_TYPE_MASK_OTHER_LAYOUT_MAX 15
#define RCA4_TYPE_MASK_ALL 0xf31f

struct cb_recallanyargs {
	uint32_t	craa_objs_to_keep;
	uint32_t	craa_type_mask;
};

extern __be32 nfs4_callback_recallany(struct cb_recallanyargs *args,
					void *dummy,
					struct cb_process_state *cps);

struct cb_recallslotargs {
	uint32_t	crsa_target_highest_slotid;
};
extern __be32 nfs4_callback_recallslot(struct cb_recallslotargs *args,
					 void *dummy,
					 struct cb_process_state *cps);

struct cb_layoutrecallargs {
	uint32_t		cbl_recall_type;
	uint32_t		cbl_layout_type;
	uint32_t		cbl_layoutchanged;
	union {
		struct {
			struct nfs_fh		cbl_fh;
			struct pnfs_layout_range cbl_range;
			nfs4_stateid		cbl_stateid;
		};
		struct nfs_fsid		cbl_fsid;
	};
};

extern __be32 nfs4_callback_layoutrecall(
	struct cb_layoutrecallargs *args,
	void *dummy, struct cb_process_state *cps);

struct cb_devicenotifyitem {
	uint32_t		cbd_notify_type;
	uint32_t		cbd_layout_type;
	struct nfs4_deviceid	cbd_dev_id;
	uint32_t		cbd_immediate;
};

struct cb_devicenotifyargs {
	int				 ndevs;
	struct cb_devicenotifyitem	 *devs;
};

extern __be32 nfs4_callback_devicenotify(
	struct cb_devicenotifyargs *args,
	void *dummy, struct cb_process_state *cps);

struct cb_notify_lock_args {
	struct nfs_fh			cbnl_fh;
	struct nfs_lowner		cbnl_owner;
	bool				cbnl_valid;
};

extern __be32 nfs4_callback_notify_lock(struct cb_notify_lock_args *args,
					 void *dummy,
					 struct cb_process_state *cps);
#endif /* CONFIG_NFS_V4_1 */
extern int check_gss_callback_principal(struct nfs_client *, struct svc_rqst *);
extern __be32 nfs4_callback_getattr(struct cb_getattrargs *args,
				    struct cb_getattrres *res,
				    struct cb_process_state *cps);
extern __be32 nfs4_callback_recall(struct cb_recallargs *args, void *dummy,
				   struct cb_process_state *cps);
#if IS_ENABLED(CONFIG_NFS_V4)
extern int nfs_callback_up(u32 minorversion, struct rpc_xprt *xprt);
extern void nfs_callback_down(int minorversion, struct net *net);
#endif /* CONFIG_NFS_V4 */
/*
 * nfs41: Callbacks are expected to not cause substantial latency,
 * so we limit their concurrency to 1 by setting up the maximum number
 * of slots for the backchannel.
 */
#define NFS41_BC_MIN_CALLBACKS 1
#define NFS41_BC_MAX_CALLBACKS 1

#define NFS4_MIN_NR_CALLBACK_THREADS 1

extern unsigned int nfs_callback_set_tcpport;
extern unsigned short nfs_callback_nr_threads;

#endif /* __LINUX_FS_NFS_CALLBACK_H */