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 {
22 enum nfs4_callback_opnum {
25 /* Callback operations new to NFSv4.1 */
26 OP_CB_LAYOUTRECALL = 5,
30 OP_CB_RECALLABLE_OBJ_AVAIL = 9,
31 OP_CB_RECALL_SLOT = 10,
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 */
38 OP_CB_ILLEGAL = 10044,
42 struct cb_process_state {
44 struct nfs_client *clp;
45 struct nfs4_slot *slot;
50 struct cb_compound_hdr_arg {
53 unsigned int minorversion;
54 unsigned int cb_ident; /* v4.0 callback identifier */
58 struct cb_compound_hdr_res {
65 struct cb_getattrargs {
70 struct cb_getattrres {
75 struct timespec64 ctime;
76 struct timespec64 mtime;
79 struct cb_recallargs {
85 #if defined(CONFIG_NFS_V4_1)
87 struct referring_call {
88 uint32_t rc_sequenceid;
92 struct referring_call_list {
93 struct nfs4_sessionid rcl_sessionid;
94 uint32_t rcl_nrefcalls;
95 struct referring_call *rcl_refcalls;
98 struct cb_sequenceargs {
99 struct sockaddr *csa_addr;
100 struct nfs4_sessionid csa_sessionid;
101 uint32_t csa_sequenceid;
103 uint32_t csa_highestslotid;
104 uint32_t csa_cachethis;
105 uint32_t csa_nrclists;
106 struct referring_call_list *csa_rclists;
109 struct cb_sequenceres {
111 struct nfs4_sessionid csr_sessionid;
112 uint32_t csr_sequenceid;
114 uint32_t csr_highestslotid;
115 uint32_t csr_target_highestslotid;
118 extern __be32 nfs4_callback_sequence(void *argp, void *resp,
119 struct cb_process_state *cps);
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 PNFS_FF_RCA4_TYPE_MASK_READ 16
131 #define PNFS_FF_RCA4_TYPE_MASK_RW 17
132 #define RCA4_TYPE_MASK_ALL 0x3f31f
134 struct cb_recallanyargs {
135 uint32_t craa_objs_to_keep;
136 uint32_t craa_type_mask;
139 extern __be32 nfs4_callback_recallany(void *argp, void *resp,
140 struct cb_process_state *cps);
142 struct cb_recallslotargs {
143 uint32_t crsa_target_highest_slotid;
145 extern __be32 nfs4_callback_recallslot(void *argp, void *resp,
146 struct cb_process_state *cps);
148 struct cb_layoutrecallargs {
149 uint32_t cbl_recall_type;
150 uint32_t cbl_layout_type;
151 uint32_t cbl_layoutchanged;
154 struct nfs_fh cbl_fh;
155 struct pnfs_layout_range cbl_range;
156 nfs4_stateid cbl_stateid;
158 struct nfs_fsid cbl_fsid;
162 extern __be32 nfs4_callback_layoutrecall(void *argp, void *resp,
163 struct cb_process_state *cps);
165 struct cb_devicenotifyitem {
166 uint32_t cbd_notify_type;
167 uint32_t cbd_layout_type;
168 struct nfs4_deviceid cbd_dev_id;
169 uint32_t cbd_immediate;
172 struct cb_devicenotifyargs {
174 struct cb_devicenotifyitem *devs;
177 extern __be32 nfs4_callback_devicenotify(void *argp, void *resp,
178 struct cb_process_state *cps);
180 struct cb_notify_lock_args {
181 struct nfs_fh cbnl_fh;
182 struct nfs_lowner cbnl_owner;
186 extern __be32 nfs4_callback_notify_lock(void *argp, void *resp,
187 struct cb_process_state *cps);
188 #endif /* CONFIG_NFS_V4_1 */
189 #ifdef CONFIG_NFS_V4_2
190 struct cb_offloadargs {
191 struct nfs_fh coa_fh;
192 nfs4_stateid coa_stateid;
195 struct nfs_writeverf wr_writeverf;
198 extern __be32 nfs4_callback_offload(void *args, void *dummy,
199 struct cb_process_state *cps);
200 #endif /* CONFIG_NFS_V4_2 */
201 extern int check_gss_callback_principal(struct nfs_client *, struct svc_rqst *);
202 extern __be32 nfs4_callback_getattr(void *argp, void *resp,
203 struct cb_process_state *cps);
204 extern __be32 nfs4_callback_recall(void *argp, void *resp,
205 struct cb_process_state *cps);
206 #if IS_ENABLED(CONFIG_NFS_V4)
207 extern int nfs_callback_up(u32 minorversion, struct rpc_xprt *xprt);
208 extern void nfs_callback_down(int minorversion, struct net *net);
209 #endif /* CONFIG_NFS_V4 */
211 * nfs41: Callbacks are expected to not cause substantial latency,
212 * so we limit their concurrency to 1 by setting up the maximum number
213 * of slots for the backchannel.
215 #define NFS41_BC_MIN_CALLBACKS 1
216 #define NFS41_BC_MAX_CALLBACKS 1
218 #define NFS4_MIN_NR_CALLBACK_THREADS 1
220 extern unsigned int nfs_callback_set_tcpport;
221 extern unsigned short nfs_callback_nr_threads;
223 #endif /* __LINUX_FS_NFS_CALLBACK_H */