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
  15 enum nfs4_callback_procnum {
  16         CB_NULL = 0,
  17         CB_COMPOUND = 1,
  18 };
  19
  20 enum 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
  37 struct cb_compound_hdr_arg {
  38         unsigned int taglen;
  39         const char *tag;
  40         unsigned int minorversion;
  41         unsigned nops;
  42 };
  43
  44 struct cb_compound_hdr_res {
  45         __be32 *status;
  46         unsigned int taglen;
  47         const char *tag;
  48         __be32 *nops;
  49 };
  50
  51 struct cb_getattrargs {
  52         struct sockaddr *addr;
  53         struct nfs_fh fh;
  54         uint32_t bitmap[2];
  55 };
  56
  57 struct 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
  66 struct 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
  75 struct referring_call {
  76         uint32_t                        rc_sequenceid;
  77         uint32_t                        rc_slotid;
  78 };
  79
  80 struct referring_call_list {
  81         struct nfs4_sessionid           rcl_sessionid;
  82         uint32_t                        rcl_nrefcalls;
  83         struct referring_call           *rcl_refcalls;
  84 };
  85
  86 struct 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
  97 struct 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
 106 extern unsigned nfs4_callback_sequence(struct cb_sequenceargs *args,
 107                                        struct cb_sequenceres *res);
 108
 109 #endif /* CONFIG_NFS_V4_1 */
 110
 111 extern __be32 nfs4_callback_getattr(struct cb_getattrargs *args, struct cb_getattrres *res);
 112 extern __be32 nfs4_callback_recall(struct cb_recallargs *args, void *dummy);
 113
 114 #ifdef CONFIG_NFS_V4
 115 extern int nfs_callback_up(u32 minorversion, struct rpc_xprt *xprt);
 116 extern 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
 127 extern unsigned int nfs_callback_set_tcpport;
 128 extern unsigned short nfs_callback_tcpport;
 129 extern unsigned short nfs_callback_tcpport6;
 130
 131 #endif /* __LINUX_FS_NFS_CALLBACK_H */