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,
41 struct cb_process_state {
43 struct nfs_client *clp;
44 struct nfs4_slot *slot;
49 struct cb_compound_hdr_arg {
52 unsigned int minorversion;
53 unsigned int cb_ident; /* v4.0 callback identifier */
57 struct cb_compound_hdr_res {
64 struct cb_getattrargs {
69 struct cb_getattrres {
74 struct timespec ctime;
75 struct timespec mtime;
78 struct cb_recallargs {
84 #if defined(CONFIG_NFS_V4_1)
86 struct referring_call {
87 uint32_t rc_sequenceid;
91 struct referring_call_list {
92 struct nfs4_sessionid rcl_sessionid;
93 uint32_t rcl_nrefcalls;
94 struct referring_call *rcl_refcalls;
97 struct cb_sequenceargs {
98 struct sockaddr *csa_addr;
99 struct nfs4_sessionid csa_sessionid;
100 uint32_t csa_sequenceid;
102 uint32_t csa_highestslotid;
103 uint32_t csa_cachethis;
104 uint32_t csa_nrclists;
105 struct referring_call_list *csa_rclists;
108 struct cb_sequenceres {
110 struct nfs4_sessionid csr_sessionid;
111 uint32_t csr_sequenceid;
113 uint32_t csr_highestslotid;
114 uint32_t csr_target_highestslotid;
117 extern __be32 nfs4_callback_sequence(void *argp, void *resp,
118 struct cb_process_state *cps);
120 #define RCA4_TYPE_MASK_RDATA_DLG 0
121 #define RCA4_TYPE_MASK_WDATA_DLG 1
122 #define RCA4_TYPE_MASK_DIR_DLG 2
123 #define RCA4_TYPE_MASK_FILE_LAYOUT 3
124 #define RCA4_TYPE_MASK_BLK_LAYOUT 4
125 #define RCA4_TYPE_MASK_OBJ_LAYOUT_MIN 8
126 #define RCA4_TYPE_MASK_OBJ_LAYOUT_MAX 9
127 #define RCA4_TYPE_MASK_OTHER_LAYOUT_MIN 12
128 #define RCA4_TYPE_MASK_OTHER_LAYOUT_MAX 15
129 #define RCA4_TYPE_MASK_ALL 0xf31f
131 struct cb_recallanyargs {
132 uint32_t craa_objs_to_keep;
133 uint32_t craa_type_mask;
136 extern __be32 nfs4_callback_recallany(void *argp, void *resp,
137 struct cb_process_state *cps);
139 struct cb_recallslotargs {
140 uint32_t crsa_target_highest_slotid;
142 extern __be32 nfs4_callback_recallslot(void *argp, void *resp,
143 struct cb_process_state *cps);
145 struct cb_layoutrecallargs {
146 uint32_t cbl_recall_type;
147 uint32_t cbl_layout_type;
148 uint32_t cbl_layoutchanged;
151 struct nfs_fh cbl_fh;
152 struct pnfs_layout_range cbl_range;
153 nfs4_stateid cbl_stateid;
155 struct nfs_fsid cbl_fsid;
159 extern __be32 nfs4_callback_layoutrecall(void *argp, void *resp,
160 struct cb_process_state *cps);
162 struct cb_devicenotifyitem {
163 uint32_t cbd_notify_type;
164 uint32_t cbd_layout_type;
165 struct nfs4_deviceid cbd_dev_id;
166 uint32_t cbd_immediate;
169 struct cb_devicenotifyargs {
171 struct cb_devicenotifyitem *devs;
174 extern __be32 nfs4_callback_devicenotify(void *argp, void *resp,
175 struct cb_process_state *cps);
177 struct cb_notify_lock_args {
178 struct nfs_fh cbnl_fh;
179 struct nfs_lowner cbnl_owner;
183 extern __be32 nfs4_callback_notify_lock(void *argp, void *resp,
184 struct cb_process_state *cps);
185 #endif /* CONFIG_NFS_V4_1 */
186 extern int check_gss_callback_principal(struct nfs_client *, struct svc_rqst *);
187 extern __be32 nfs4_callback_getattr(void *argp, void *resp,
188 struct cb_process_state *cps);
189 extern __be32 nfs4_callback_recall(void *argp, void *resp,
190 struct cb_process_state *cps);
191 #if IS_ENABLED(CONFIG_NFS_V4)
192 extern int nfs_callback_up(u32 minorversion, struct rpc_xprt *xprt);
193 extern void nfs_callback_down(int minorversion, struct net *net);
194 #endif /* CONFIG_NFS_V4 */
196 * nfs41: Callbacks are expected to not cause substantial latency,
197 * so we limit their concurrency to 1 by setting up the maximum number
198 * of slots for the backchannel.
200 #define NFS41_BC_MIN_CALLBACKS 1
201 #define NFS41_BC_MAX_CALLBACKS 1
203 #define NFS4_MIN_NR_CALLBACK_THREADS 1
205 extern unsigned int nfs_callback_set_tcpport;
206 extern unsigned short nfs_callback_nr_threads;
208 #endif /* __LINUX_FS_NFS_CALLBACK_H */