1 /* SPDX-License-Identifier: GPL-2.0 */
3 * linux/fs/nfs/callback.h
5 * Copyright (C) 2004 Trond Myklebust
7 * NFSv4 callback definitions
9 #ifndef __LINUX_FS_NFS_CALLBACK_H
10 #define __LINUX_FS_NFS_CALLBACK_H
11 #include <linux/sunrpc/svc.h>
13 #define NFS4_CALLBACK 0x40000000
14 #define NFS4_CALLBACK_XDRSIZE 2048
15 #define NFS4_CALLBACK_BUFSIZE (1024 + NFS4_CALLBACK_XDRSIZE)
17 enum nfs4_callback_procnum {
23 struct cb_process_state {
24 struct nfs_client *clp;
25 struct nfs4_slot *slot;
29 unsigned int referring_calls;
32 struct cb_compound_hdr_arg {
35 unsigned int minorversion;
36 unsigned int cb_ident; /* v4.0 callback identifier */
40 struct cb_compound_hdr_res {
47 struct cb_getattrargs {
52 struct cb_getattrres {
57 struct timespec64 atime;
58 struct timespec64 ctime;
59 struct timespec64 mtime;
62 struct cb_recallargs {
68 #if defined(CONFIG_NFS_V4_1)
70 struct referring_call {
71 uint32_t rc_sequenceid;
75 struct referring_call_list {
76 struct nfs4_sessionid rcl_sessionid;
77 uint32_t rcl_nrefcalls;
78 struct referring_call *rcl_refcalls;
81 struct cb_sequenceargs {
82 struct sockaddr *csa_addr;
83 struct nfs4_sessionid csa_sessionid;
84 uint32_t csa_sequenceid;
86 uint32_t csa_highestslotid;
87 uint32_t csa_cachethis;
88 uint32_t csa_nrclists;
89 struct referring_call_list *csa_rclists;
92 struct cb_sequenceres {
94 struct nfs4_sessionid csr_sessionid;
95 uint32_t csr_sequenceid;
97 uint32_t csr_highestslotid;
98 uint32_t csr_target_highestslotid;
101 extern __be32 nfs4_callback_sequence(void *argp, void *resp,
102 struct cb_process_state *cps);
104 #define RCA4_TYPE_MASK_RDATA_DLG 0
105 #define RCA4_TYPE_MASK_WDATA_DLG 1
106 #define RCA4_TYPE_MASK_DIR_DLG 2
107 #define RCA4_TYPE_MASK_FILE_LAYOUT 3
108 #define RCA4_TYPE_MASK_BLK_LAYOUT 4
109 #define RCA4_TYPE_MASK_OBJ_LAYOUT_MIN 8
110 #define RCA4_TYPE_MASK_OBJ_LAYOUT_MAX 9
111 #define RCA4_TYPE_MASK_OTHER_LAYOUT_MIN 12
112 #define RCA4_TYPE_MASK_OTHER_LAYOUT_MAX 15
113 #define PNFS_FF_RCA4_TYPE_MASK_READ 16
114 #define PNFS_FF_RCA4_TYPE_MASK_RW 17
115 #define RCA4_TYPE_MASK_ALL 0x3f31f
117 struct cb_recallanyargs {
118 uint32_t craa_objs_to_keep;
119 uint32_t craa_type_mask;
122 extern __be32 nfs4_callback_recallany(void *argp, void *resp,
123 struct cb_process_state *cps);
125 struct cb_recallslotargs {
126 uint32_t crsa_target_highest_slotid;
128 extern __be32 nfs4_callback_recallslot(void *argp, void *resp,
129 struct cb_process_state *cps);
131 struct cb_layoutrecallargs {
132 uint32_t cbl_recall_type;
133 uint32_t cbl_layout_type;
134 uint32_t cbl_layoutchanged;
137 struct nfs_fh cbl_fh;
138 struct pnfs_layout_range cbl_range;
139 nfs4_stateid cbl_stateid;
141 struct nfs_fsid cbl_fsid;
145 extern __be32 nfs4_callback_layoutrecall(void *argp, void *resp,
146 struct cb_process_state *cps);
148 struct cb_devicenotifyitem {
149 uint32_t cbd_notify_type;
150 uint32_t cbd_layout_type;
151 struct nfs4_deviceid cbd_dev_id;
152 uint32_t cbd_immediate;
155 struct cb_devicenotifyargs {
157 struct cb_devicenotifyitem *devs;
160 extern __be32 nfs4_callback_devicenotify(void *argp, void *resp,
161 struct cb_process_state *cps);
163 struct cb_notify_lock_args {
164 struct nfs_fh cbnl_fh;
165 struct nfs_lowner cbnl_owner;
169 extern __be32 nfs4_callback_notify_lock(void *argp, void *resp,
170 struct cb_process_state *cps);
171 #endif /* CONFIG_NFS_V4_1 */
172 #ifdef CONFIG_NFS_V4_2
173 struct cb_offloadargs {
174 struct nfs_fh coa_fh;
175 nfs4_stateid coa_stateid;
178 struct nfs_writeverf wr_writeverf;
181 extern __be32 nfs4_callback_offload(void *args, void *dummy,
182 struct cb_process_state *cps);
183 #endif /* CONFIG_NFS_V4_2 */
184 extern int check_gss_callback_principal(struct nfs_client *, struct svc_rqst *);
185 extern __be32 nfs4_callback_getattr(void *argp, void *resp,
186 struct cb_process_state *cps);
187 extern __be32 nfs4_callback_recall(void *argp, void *resp,
188 struct cb_process_state *cps);
189 #if IS_ENABLED(CONFIG_NFS_V4)
190 extern int nfs_callback_up(u32 minorversion, struct rpc_xprt *xprt);
191 extern void nfs_callback_down(int minorversion, struct net *net);
192 #endif /* CONFIG_NFS_V4 */
194 * nfs41: Callbacks are expected to not cause substantial latency,
195 * so we limit their concurrency to 1 by setting up the maximum number
196 * of slots for the backchannel.
198 #define NFS41_BC_MIN_CALLBACKS 1
199 #define NFS41_BC_MAX_CALLBACKS 1
201 #define NFS4_MIN_NR_CALLBACK_THREADS 1
203 extern unsigned int nfs_callback_set_tcpport;
204 extern unsigned short nfs_callback_nr_threads;
206 #endif /* __LINUX_FS_NFS_CALLBACK_H */