LXR linux/fs/nfs/callback.h

   1/*
   2 * linux/fs/nfs/callback.h
   3 *
   4 * Copyright (C) 2004 Trond Myklebust
   5 *
   6 * NFSv4 callback definitions
   7 */
   8#ifndef __LINUX_FS_NFS_CALLBACK_H
   9#define __LINUX_FS_NFS_CALLBACK_H
  10
  11#define NFS4_CALLBACK 0x40000000
  12#define NFS4_CALLBACK_XDRSIZE 2048
  13#define NFS4_CALLBACK_BUFSIZE (1024 + NFS4_CALLBACK_XDRSIZE)
  14
  15enum nfs4_callback_procnum {
  16        CB_NULL = 0,
  17        CB_COMPOUND = 1,
  18};
  19
  20enum nfs4_callback_opnum {
  21        OP_CB_GETATTR = 3,
  22        OP_CB_RECALL  = 4,
  23/* Callback operations new to NFSv4.1 */
  24        OP_CB_LAYOUTRECALL  = 5,
  25        OP_CB_NOTIFY        = 6,
  26        OP_CB_PUSH_DELEG    = 7,
  27        OP_CB_RECALL_ANY    = 8,
  28        OP_CB_RECALLABLE_OBJ_AVAIL = 9,
  29        OP_CB_RECALL_SLOT   = 10,
  30        OP_CB_SEQUENCE      = 11,
  31        OP_CB_WANTS_CANCELLED = 12,
  32        OP_CB_NOTIFY_LOCK   = 13,
  33        OP_CB_NOTIFY_DEVICEID = 14,
  34        OP_CB_ILLEGAL = 10044,
  35};
  36
  37struct cb_compound_hdr_arg {
  38        unsigned int taglen;
  39        const char *tag;
  40        unsigned int minorversion;
  41        unsigned nops;
  42};
  43
  44struct cb_compound_hdr_res {
  45        __be32 *status;
  46        unsigned int taglen;
  47        const char *tag;
  48        __be32 *nops;
  49};
  50
  51struct cb_getattrargs {
  52        struct sockaddr *addr;
  53        struct nfs_fh fh;
  54        uint32_t bitmap[2];
  55};
  56
  57struct cb_getattrres {
  58        __be32 status;
  59        uint32_t bitmap[2];
  60        uint64_t size;
  61        uint64_t change_attr;
  62        struct timespec ctime;
  63        struct timespec mtime;
  64};
  65
  66struct cb_recallargs {
  67        struct sockaddr *addr;
  68        struct nfs_fh fh;
  69        nfs4_stateid stateid;
  70        uint32_t truncate;
  71};
  72
  73#if defined(CONFIG_NFS_V4_1)
  74
  75struct referring_call {
  76        uint32_t                        rc_sequenceid;
  77        uint32_t                        rc_slotid;
  78};
  79
  80struct referring_call_list {
  81        struct nfs4_sessionid           rcl_sessionid;
  82        uint32_t                        rcl_nrefcalls;
  83        struct referring_call           *rcl_refcalls;
  84};
  85
  86struct cb_sequenceargs {
  87        struct sockaddr                 *csa_addr;
  88        struct nfs4_sessionid           csa_sessionid;
  89        uint32_t                        csa_sequenceid;
  90        uint32_t                        csa_slotid;
  91        uint32_t                        csa_highestslotid;
  92        uint32_t                        csa_cachethis;
  93        uint32_t                        csa_nrclists;
  94        struct referring_call_list      *csa_rclists;
  95};
  96
  97struct cb_sequenceres {
  98        __be32                          csr_status;
  99        struct nfs4_sessionid           csr_sessionid;
 100        uint32_t                        csr_sequenceid;
 101        uint32_t                        csr_slotid;
 102        uint32_t                        csr_highestslotid;
 103        uint32_t                        csr_target_highestslotid;
 104};
 105
 106extern unsigned nfs4_callback_sequence(struct cb_sequenceargs *args,
 107                                       struct cb_sequenceres *res);
 108
 109#endif /* CONFIG_NFS_V4_1 */
 110
 111extern __be32 nfs4_callback_getattr(struct cb_getattrargs *args, struct cb_getattrres *res);
 112extern __be32 nfs4_callback_recall(struct cb_recallargs *args, void *dummy);
 113
 114#ifdef CONFIG_NFS_V4
 115extern int nfs_callback_up(u32 minorversion, struct rpc_xprt *xprt);
 116extern void nfs_callback_down(int minorversion);
 117#endif /* CONFIG_NFS_V4 */
 118
 119/*
 120 * nfs41: Callbacks are expected to not cause substantial latency,
 121 * so we limit their concurrency to 1 by setting up the maximum number
 122 * of slots for the backchannel.
 123 */
 124#define NFS41_BC_MIN_CALLBACKS 1
 125#define NFS41_BC_MAX_CALLBACKS 1
 126
 127extern unsigned int nfs_callback_set_tcpport;
 128extern unsigned short nfs_callback_tcpport;
 129extern unsigned short nfs_callback_tcpport6;
 130
 131#endif /* __LINUX_FS_NFS_CALLBACK_H */
 132