FreeBSD/Linux Kernel Cross Reference
sys/nfs/nqnfs.h

     /*
      * Copyright (c) 1992, 1993
      *      The Regents of the University of California.  All rights reserved.
      *
      * This code is derived from software contributed to Berkeley by
      * Rick Macklem at The University of Guelph.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by the University of
     *      California, Berkeley and its contributors.
     * 4. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      @(#)nqnfs.h     8.3 (Berkeley) 3/30/95
     * $FreeBSD$
     */
    
    
    #ifndef _NFS_NQNFS_H_
    #define _NFS_NQNFS_H_
    
    /*
     * Definitions for NQNFS (Not Quite NFS) cache consistency protocol.
     */
    
    /* Tunable constants */
    #define NQ_CLOCKSKEW    3       /* Clock skew factor (sec) */
    #define NQ_WRITESLACK   5       /* Delay for write cache flushing */
    #define NQ_MAXLEASE     60      /* Max lease duration (sec) */
    #define NQ_MINLEASE     5       /* Min lease duration (sec) */
    #define NQ_DEFLEASE     30      /* Default lease duration (sec) */
    #define NQ_RENEWAL      3       /* Time before expiry (sec) to renew */
    #define NQ_TRYLATERDEL  15      /* Initial try later delay (sec) */
    #define NQ_MAXNUMLEASE  2048    /* Upper bound on number of server leases */
    #define NQ_DEADTHRESH   NQ_NEVERDEAD    /* Default nm_deadthresh */
    #define NQ_NEVERDEAD    9       /* Greater than max. nm_timeouts */
    #define NQLCHSZ         256     /* Server hash table size */
    
    #define NQNFS_PROG      300105  /* As assigned by Sun */
    #define NQNFS_VER3      3
    #define NQNFS_EVICTSIZ  156     /* Size of eviction request in bytes */
    
    #if defined(_KERNEL)
    /*
     * Definitions used for saving the "last lease expires" time in Non-volatile
     * RAM on the server. The default definitions below assume that NOVRAM is not
     * available.
     */
    #ifdef HASNVRAM
    #  undef HASNVRAM
    #endif
    #define NQSTORENOVRAM(t)
    #define NQLOADNOVRAM(t)
    
    /*
     * Defn and structs used on the server to maintain state for current leases.
     * The list of host(s) that hold the lease are kept as nqhost structures.
     * The first one lives in nqlease and any others are held in a linked
     * list of nqm structures hanging off of nqlease.
     *
     * Each nqlease structure is chained into two lists. The first is a list
     * ordered by increasing expiry time for nqsrv_timer() and the second is a chain
     * hashed on lc_fh.
     */
    #define LC_MOREHOSTSIZ  10
    
    struct nqhost {
            u_int16_t lph_flag;
            u_int16_t lph_port;
            struct nfssvc_sock *lph_slp;
    
            union {
                    struct {
                            union nethostaddr udp_haddr;
                    } un_udp;
                    struct {
                            int     dummy;
                   } un_conn;
           } lph_un;
   };
   #define lph_haddr       lph_un.un_udp.udp_haddr
   #define lph_inetaddr    lph_un.un_udp.udp_haddr.had_inetaddr
   
   struct nqlease {
           LIST_ENTRY(nqlease) lc_hash;    /* Fhandle hash list */
           CIRCLEQ_ENTRY(nqlease) lc_timer; /* Timer queue list */
           time_t          lc_expiry;      /* Expiry time (sec) */
           struct nqhost   lc_host;        /* Host that got lease */
           struct nqm      *lc_morehosts;  /* Other hosts that share read lease */
           fsid_t          lc_fsid;        /* Fhandle */
           char            lc_fiddata[MAXFIDSZ];
           struct vnode    *lc_vp;         /* Soft reference to associated vnode */
   };
   #define lc_flag         lc_host.lph_flag
   
   /* lc_flag bits */
   #define LC_VALID        0x0001  /* Host address valid */
   #define LC_WRITE        0x0002  /* Write cache */
   #define LC_NONCACHABLE  0x0004  /* Non-cachable lease */
   #define LC_LOCKED       0x0008  /* Locked */
   #define LC_WANTED       0x0010  /* Lock wanted */
   #define LC_EXPIREDWANTED 0x0020 /* Want lease when expired */
   #define LC_UDP          0x0040  /* Host address for udp socket */
   /* 0x0080 free */
   #define LC_LOCAL        0x0100  /* Host is server */
   #define LC_VACATED      0x0200  /* Host has vacated lease */
   #define LC_WRITTEN      0x0400  /* Recently wrote to the leased file */
   #define LC_SREF         0x0800  /* Holds a nfssvc_sock reference */
   
   struct nqm {
           struct nqm      *lpm_next;
           struct nqhost   lpm_hosts[LC_MOREHOSTSIZ];
   };
   
   /*
    * Special value for slp for local server calls.
    */
   #define NQLOCALSLP      ((struct nfssvc_sock *) -1)
   
   /*
    * Server side macros.
    */
   #define nqsrv_getl(v, l) \
                   (void) nqsrv_getlease((v), &nfsd->nd_duration, \
                    ((nfsd->nd_flag & ND_LEASE) ? (nfsd->nd_flag & ND_LEASE) : \
                    ((l) | ND_CHECK)), \
                    slp, procp, nfsd->nd_nam, &cache, &frev, cred)
   
   /*
    * Client side macros that check for a valid lease.
    */
   #define NQNFS_CKINVALID(v, n, f) \
    ((time_second > (n)->n_expiry && \
    VFSTONFS((v)->v_mount)->nm_timeouts < VFSTONFS((v)->v_mount)->nm_deadthresh) \
     || ((f) == ND_WRITE && ((n)->n_flag & NQNFSWRITE) == 0))
   
   #define NQNFS_CKCACHABLE(v, f) \
    ((time_second <= VTONFS(v)->n_expiry || \
     VFSTONFS((v)->v_mount)->nm_timeouts >= VFSTONFS((v)->v_mount)->nm_deadthresh) \
      && (VTONFS(v)->n_flag & NQNFSNONCACHE) == 0 && \
      ((f) == ND_READ || (VTONFS(v)->n_flag & NQNFSWRITE)))
   
   #define NQNFS_NEEDLEASE(v, p) \
                   (time_second > VTONFS(v)->n_expiry ? \
                    ((VTONFS(v)->n_flag & NQNFSEVICTED) ? 0 : nqnfs_piggy[p]) : \
                    (((time_second + NQ_RENEWAL) > VTONFS(v)->n_expiry && \
                      nqnfs_piggy[p]) ? \
                      ((VTONFS(v)->n_flag & NQNFSWRITE) ? \
                       ND_WRITE : nqnfs_piggy[p]) : 0))
   
   /*
    * List head for timer queue.
    */
   extern CIRCLEQ_HEAD(nqtimerhead, nqlease) nqtimerhead;
   
   /*
    * List head for the file handle hash table.
    */
   #define NQFHHASH(f) \
           (&nqfhhashtbl[(*((u_int32_t *)(f))) & nqfhhash])
   extern LIST_HEAD(nqfhhashhead, nqlease) *nqfhhashtbl;
   extern u_long nqfhhash;
   
   /*
    * Nqnfs return status numbers.
    */
   #define NQNFS_EXPIRED   500
   #define NQNFS_TRYLATER  501
   
   void    nqnfs_lease_check __P((struct vnode *, struct proc *, struct ucred *, int));
   void    nqnfs_lease_updatetime __P((int));
   int     nqsrv_getlease __P((struct vnode *, u_int32_t *, int,
                               struct nfssvc_sock *, struct proc *,
                               struct sockaddr *, int *, u_quad_t *,
                               struct ucred *));
   int     nqnfs_getlease __P((struct vnode *,int,struct ucred *,struct proc *));
   int     nqnfs_callback __P((struct nfsmount *,struct mbuf *,struct mbuf *,caddr_t));
   int     nqnfs_clientd __P((struct nfsmount *,struct ucred *,struct nfsd_cargs *,int,caddr_t,struct proc *));
   struct nfsnode;
   void    nqnfs_clientlease __P((struct nfsmount *, struct nfsnode *, int, int, time_t, u_quad_t));
   void    nqnfs_serverd __P((void));
   int     nqnfsrv_getlease __P((struct nfsrv_descript *, struct nfssvc_sock *, struct proc *, struct mbuf **));
   int     nqnfsrv_vacated __P((struct nfsrv_descript *, struct nfssvc_sock *, struct proc *, struct mbuf **));
   #endif
   
   #endif

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