Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * linux/fs/nfs/callback.h
4 *
5 * Copyright (C) 2004 Trond Myklebust
6 *
7 * NFSv4 callback definitions
8 */
9#ifndef __LINUX_FS_NFS_CALLBACK_H
10#define __LINUX_FS_NFS_CALLBACK_H
11#include <linux/sunrpc/svc.h>
12
13#define NFS4_CALLBACK 0x40000000
14#define NFS4_CALLBACK_XDRSIZE 2048
15#define NFS4_CALLBACK_BUFSIZE (1024 + NFS4_CALLBACK_XDRSIZE)
16
17enum nfs4_callback_procnum {
18 CB_NULL = 0,
19 CB_COMPOUND = 1,
20};
21
22enum nfs4_callback_opnum {
23 OP_CB_GETATTR = 3,
24 OP_CB_RECALL = 4,
25/* Callback operations new to NFSv4.1 */
26 OP_CB_LAYOUTRECALL = 5,
27 OP_CB_NOTIFY = 6,
28 OP_CB_PUSH_DELEG = 7,
29 OP_CB_RECALL_ANY = 8,
30 OP_CB_RECALLABLE_OBJ_AVAIL = 9,
31 OP_CB_RECALL_SLOT = 10,
32 OP_CB_SEQUENCE = 11,
33 OP_CB_WANTS_CANCELLED = 12,
34 OP_CB_NOTIFY_LOCK = 13,
35 OP_CB_NOTIFY_DEVICEID = 14,
36/* Callback operations new to NFSv4.2 */
37 OP_CB_OFFLOAD = 15,
38 OP_CB_ILLEGAL = 10044,
39};
40
41struct nfs4_slot;
42struct cb_process_state {
43 __be32 drc_status;
44 struct nfs_client *clp;
45 struct nfs4_slot *slot;
46 u32 minorversion;
47 struct net *net;
48};
49
50struct cb_compound_hdr_arg {
51 unsigned int taglen;
52 const char *tag;
53 unsigned int minorversion;
54 unsigned int cb_ident; /* v4.0 callback identifier */
55 unsigned nops;
56};
57
58struct cb_compound_hdr_res {
59 __be32 *status;
60 unsigned int taglen;
61 const char *tag;
62 __be32 *nops;
63};
64
65struct cb_getattrargs {
66 struct nfs_fh fh;
67 uint32_t bitmap[2];
68};
69
70struct cb_getattrres {
71 __be32 status;
72 uint32_t bitmap[2];
73 uint64_t size;
74 uint64_t change_attr;
75 struct timespec ctime;
76 struct timespec mtime;
77};
78
79struct cb_recallargs {
80 struct nfs_fh fh;
81 nfs4_stateid stateid;
82 uint32_t truncate;
83};
84
85#if defined(CONFIG_NFS_V4_1)
86
87struct referring_call {
88 uint32_t rc_sequenceid;
89 uint32_t rc_slotid;
90};
91
92struct referring_call_list {
93 struct nfs4_sessionid rcl_sessionid;
94 uint32_t rcl_nrefcalls;
95 struct referring_call *rcl_refcalls;
96};
97
98struct cb_sequenceargs {
99 struct sockaddr *csa_addr;
100 struct nfs4_sessionid csa_sessionid;
101 uint32_t csa_sequenceid;
102 uint32_t csa_slotid;
103 uint32_t csa_highestslotid;
104 uint32_t csa_cachethis;
105 uint32_t csa_nrclists;
106 struct referring_call_list *csa_rclists;
107};
108
109struct cb_sequenceres {
110 __be32 csr_status;
111 struct nfs4_sessionid csr_sessionid;
112 uint32_t csr_sequenceid;
113 uint32_t csr_slotid;
114 uint32_t csr_highestslotid;
115 uint32_t csr_target_highestslotid;
116};
117
118extern __be32 nfs4_callback_sequence(void *argp, void *resp,
119 struct cb_process_state *cps);
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 uint32_t craa_objs_to_keep;
134 uint32_t craa_type_mask;
135};
136
137extern __be32 nfs4_callback_recallany(void *argp, void *resp,
138 struct cb_process_state *cps);
139
140struct cb_recallslotargs {
141 uint32_t crsa_target_highest_slotid;
142};
143extern __be32 nfs4_callback_recallslot(void *argp, void *resp,
144 struct cb_process_state *cps);
145
146struct cb_layoutrecallargs {
147 uint32_t cbl_recall_type;
148 uint32_t cbl_layout_type;
149 uint32_t cbl_layoutchanged;
150 union {
151 struct {
152 struct nfs_fh cbl_fh;
153 struct pnfs_layout_range cbl_range;
154 nfs4_stateid cbl_stateid;
155 };
156 struct nfs_fsid cbl_fsid;
157 };
158};
159
160extern __be32 nfs4_callback_layoutrecall(void *argp, void *resp,
161 struct cb_process_state *cps);
162
163struct cb_devicenotifyitem {
164 uint32_t cbd_notify_type;
165 uint32_t cbd_layout_type;
166 struct nfs4_deviceid cbd_dev_id;
167 uint32_t cbd_immediate;
168};
169
170struct cb_devicenotifyargs {
171 int ndevs;
172 struct cb_devicenotifyitem *devs;
173};
174
175extern __be32 nfs4_callback_devicenotify(void *argp, void *resp,
176 struct cb_process_state *cps);
177
178struct cb_notify_lock_args {
179 struct nfs_fh cbnl_fh;
180 struct nfs_lowner cbnl_owner;
181 bool cbnl_valid;
182};
183
184extern __be32 nfs4_callback_notify_lock(void *argp, void *resp,
185 struct cb_process_state *cps);
186#endif /* CONFIG_NFS_V4_1 */
187#ifdef CONFIG_NFS_V4_2
188struct cb_offloadargs {
189 struct nfs_fh coa_fh;
190 nfs4_stateid coa_stateid;
191 uint32_t error;
192 uint64_t wr_count;
193 struct nfs_writeverf wr_writeverf;
194};
195
196extern __be32 nfs4_callback_offload(void *args, void *dummy,
197 struct cb_process_state *cps);
198#endif /* CONFIG_NFS_V4_2 */
199extern int check_gss_callback_principal(struct nfs_client *, struct svc_rqst *);
200extern __be32 nfs4_callback_getattr(void *argp, void *resp,
201 struct cb_process_state *cps);
202extern __be32 nfs4_callback_recall(void *argp, void *resp,
203 struct cb_process_state *cps);
204#if IS_ENABLED(CONFIG_NFS_V4)
205extern int nfs_callback_up(u32 minorversion, struct rpc_xprt *xprt);
206extern void nfs_callback_down(int minorversion, struct net *net);
207#endif /* CONFIG_NFS_V4 */
208/*
209 * nfs41: Callbacks are expected to not cause substantial latency,
210 * so we limit their concurrency to 1 by setting up the maximum number
211 * of slots for the backchannel.
212 */
213#define NFS41_BC_MIN_CALLBACKS 1
214#define NFS41_BC_MAX_CALLBACKS 1
215
216#define NFS4_MIN_NR_CALLBACK_THREADS 1
217
218extern unsigned int nfs_callback_set_tcpport;
219extern unsigned short nfs_callback_nr_threads;
220
221#endif /* __LINUX_FS_NFS_CALLBACK_H */