2 * linux/fs/nfs/callback.h
4 * Copyright (C) 2004 Trond Myklebust
6 * NFSv4 callback definitions
8 #ifndef __LINUX_FS_NFS_CALLBACK_H
9 #define __LINUX_FS_NFS_CALLBACK_H
10 #include <linux/sunrpc/svc.h>
12 #define NFS4_CALLBACK 0x40000000
13 #define NFS4_CALLBACK_XDRSIZE 2048
14 #define NFS4_CALLBACK_BUFSIZE (1024 + NFS4_CALLBACK_XDRSIZE)
16 enum nfs4_callback_procnum {
21 enum nfs4_callback_opnum {
24 /* Callback operations new to NFSv4.1 */
25 OP_CB_LAYOUTRECALL = 5,
29 OP_CB_RECALLABLE_OBJ_AVAIL = 9,
30 OP_CB_RECALL_SLOT = 10,
32 OP_CB_WANTS_CANCELLED = 12,
33 OP_CB_NOTIFY_LOCK = 13,
34 OP_CB_NOTIFY_DEVICEID = 14,
35 /* Callback operations new to NFSv4.2 */
37 OP_CB_ILLEGAL = 10044,
40 struct cb_process_state {
42 struct nfs_client *clp;
48 struct cb_compound_hdr_arg {
51 unsigned int minorversion;
52 unsigned int cb_ident; /* v4.0 callback identifier */
56 struct cb_compound_hdr_res {
63 struct cb_getattrargs {
64 struct sockaddr *addr;
69 struct cb_getattrres {
74 struct timespec ctime;
75 struct timespec mtime;
78 struct cb_recallargs {
79 struct sockaddr *addr;
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(struct cb_sequenceargs *args,
119 struct cb_sequenceres *res,
120 struct cb_process_state *cps);
122 extern int nfs41_validate_delegation_stateid(struct nfs_delegation *delegation,
123 const nfs4_stateid *stateid);
125 #define RCA4_TYPE_MASK_RDATA_DLG 0
126 #define RCA4_TYPE_MASK_WDATA_DLG 1
127 #define RCA4_TYPE_MASK_DIR_DLG 2
128 #define RCA4_TYPE_MASK_FILE_LAYOUT 3
129 #define RCA4_TYPE_MASK_BLK_LAYOUT 4
130 #define RCA4_TYPE_MASK_OBJ_LAYOUT_MIN 8
131 #define RCA4_TYPE_MASK_OBJ_LAYOUT_MAX 9
132 #define RCA4_TYPE_MASK_OTHER_LAYOUT_MIN 12
133 #define RCA4_TYPE_MASK_OTHER_LAYOUT_MAX 15
134 #define RCA4_TYPE_MASK_ALL 0xf31f
136 struct cb_recallanyargs {
137 struct sockaddr *craa_addr;
138 uint32_t craa_objs_to_keep;
139 uint32_t craa_type_mask;
142 extern __be32 nfs4_callback_recallany(struct cb_recallanyargs *args,
144 struct cb_process_state *cps);
146 struct cb_recallslotargs {
147 struct sockaddr *crsa_addr;
148 uint32_t crsa_target_highest_slotid;
150 extern __be32 nfs4_callback_recallslot(struct cb_recallslotargs *args,
152 struct cb_process_state *cps);
154 struct cb_layoutrecallargs {
155 struct sockaddr *cbl_addr;
156 uint32_t cbl_recall_type;
157 uint32_t cbl_layout_type;
158 uint32_t cbl_layoutchanged;
161 struct nfs_fh cbl_fh;
162 struct pnfs_layout_range cbl_range;
163 nfs4_stateid cbl_stateid;
165 struct nfs_fsid cbl_fsid;
169 extern __be32 nfs4_callback_layoutrecall(
170 struct cb_layoutrecallargs *args,
171 void *dummy, struct cb_process_state *cps);
173 struct cb_devicenotifyitem {
174 uint32_t cbd_notify_type;
175 uint32_t cbd_layout_type;
176 struct nfs4_deviceid cbd_dev_id;
177 uint32_t cbd_immediate;
180 struct cb_devicenotifyargs {
182 struct cb_devicenotifyitem *devs;
185 extern __be32 nfs4_callback_devicenotify(
186 struct cb_devicenotifyargs *args,
187 void *dummy, struct cb_process_state *cps);
189 #endif /* CONFIG_NFS_V4_1 */
190 extern int check_gss_callback_principal(struct nfs_client *, struct svc_rqst *);
191 extern __be32 nfs4_callback_getattr(struct cb_getattrargs *args,
192 struct cb_getattrres *res,
193 struct cb_process_state *cps);
194 extern __be32 nfs4_callback_recall(struct cb_recallargs *args, void *dummy,
195 struct cb_process_state *cps);
196 #if IS_ENABLED(CONFIG_NFS_V4)
197 extern int nfs_callback_up(u32 minorversion, struct rpc_xprt *xprt);
198 extern void nfs_callback_down(int minorversion, struct net *net);
199 extern int nfs4_validate_delegation_stateid(struct nfs_delegation *delegation,
200 const nfs4_stateid *stateid);
201 extern int nfs4_set_callback_sessionid(struct nfs_client *clp);
202 #endif /* CONFIG_NFS_V4 */
204 * nfs41: Callbacks are expected to not cause substantial latency,
205 * so we limit their concurrency to 1 by setting up the maximum number
206 * of slots for the backchannel.
208 #define NFS41_BC_MIN_CALLBACKS 1
209 #define NFS41_BC_MAX_CALLBACKS 1
211 extern unsigned int nfs_callback_set_tcpport;
212 extern unsigned short nfs_callback_tcpport;
214 #endif /* __LINUX_FS_NFS_CALLBACK_H */