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_ILLEGAL = 10044,
  34 };
  35
  36 struct cb_compound_hdr_arg {
  37         unsigned int taglen;
  38         const char *tag;
  39         unsigned int minorversion;
  40         unsigned nops;
  41 };
  42
  43 struct cb_compound_hdr_res {
  44         __be32 *status;
  45         unsigned int taglen;
  46         const char *tag;
  47         __be32 *nops;
  48 };
  49
  50 struct cb_getattrargs {
  51         struct sockaddr *addr;
  52         struct nfs_fh fh;
  53         uint32_t bitmap[2];
  54 };
  55
  56 struct cb_getattrres {
  57         __be32 status;
  58         uint32_t bitmap[2];
  59         uint64_t size;
  60         uint64_t change_attr;
  61         struct timespec ctime;
  62         struct timespec mtime;
  63 };
  64
  65 struct cb_recallargs {
  66         struct sockaddr *addr;
  67         struct nfs_fh fh;
  68         nfs4_stateid stateid;
  69         uint32_t truncate;
  70 };
  71
  72 extern __be32 nfs4_callback_getattr(struct cb_getattrargs *args, struct cb_getattrres *res);
  73 extern __be32 nfs4_callback_recall(struct cb_recallargs *args, void *dummy);
  74
  75 #ifdef CONFIG_NFS_V4
  76 extern int nfs_callback_up(u32 minorversion, struct rpc_xprt *xprt);
  77 extern void nfs_callback_down(int minorversion);
  78 #endif /* CONFIG_NFS_V4 */
  79
  80 /*
  81  * nfs41: Callbacks are expected to not cause substantial latency,
  82  * so we limit their concurrency to 1 by setting up the maximum number
  83  * of slots for the backchannel.
  84  */
  85 #define NFS41_BC_MIN_CALLBACKS 1
  86
  87 extern unsigned int nfs_callback_set_tcpport;
  88 extern unsigned short nfs_callback_tcpport;
  89 extern unsigned short nfs_callback_tcpport6;
  90
  91 #endif /* __LINUX_FS_NFS_CALLBACK_H */