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Annotation of kernel/bsd/nfs/nqnfs.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
        !             7:  * Reserved.  This file contains Original Code and/or Modifications of
        !             8:  * Original Code as defined in and that are subject to the Apple Public
        !             9:  * Source License Version 1.1 (the "License").  You may not use this file
        !            10:  * except in compliance with the License.  Please obtain a copy of the
        !            11:  * License at http://www.apple.com/publicsource and read it before using
        !            12:  * this file.
        !            13:  * 
        !            14:  * The Original Code and all software distributed under the License are
        !            15:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            16:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            17:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            18:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            19:  * License for the specific language governing rights and limitations
        !            20:  * under the License.
        !            21:  * 
        !            22:  * @APPLE_LICENSE_HEADER_END@
        !            23:  */
        !            24: 
        !            25: /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
        !            26: /*
        !            27:  * Copyright (c) 1992, 1993
        !            28:  *     The Regents of the University of California.  All rights reserved.
        !            29:  *
        !            30:  * This code is derived from software contributed to Berkeley by
        !            31:  * Rick Macklem at The University of Guelph.
        !            32:  *
        !            33:  * Redistribution and use in source and binary forms, with or without
        !            34:  * modification, are permitted provided that the following conditions
        !            35:  * are met:
        !            36:  * 1. Redistributions of source code must retain the above copyright
        !            37:  *    notice, this list of conditions and the following disclaimer.
        !            38:  * 2. Redistributions in binary form must reproduce the above copyright
        !            39:  *    notice, this list of conditions and the following disclaimer in the
        !            40:  *    documentation and/or other materials provided with the distribution.
        !            41:  * 3. All advertising materials mentioning features or use of this software
        !            42:  *    must display the following acknowledgement:
        !            43:  *     This product includes software developed by the University of
        !            44:  *     California, Berkeley and its contributors.
        !            45:  * 4. Neither the name of the University nor the names of its contributors
        !            46:  *    may be used to endorse or promote products derived from this software
        !            47:  *    without specific prior written permission.
        !            48:  *
        !            49:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            50:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            51:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            52:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            53:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            54:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            55:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            56:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            57:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            58:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            59:  * SUCH DAMAGE.
        !            60:  *
        !            61:  *     @(#)nqnfs.h     8.3 (Berkeley) 3/30/95
        !            62:  * FreeBSD-Id: nqnfs.h,v 1.14 1997/08/16 19:16:05 wollman Exp $
        !            63:  */
        !            64: 
        !            65: 
        !            66: #ifndef _NFS_NQNFS_H_
        !            67: #define _NFS_NQNFS_H_
        !            68: 
        !            69: /*
        !            70:  * Definitions for NQNFS (Not Quite NFS) cache consistency protocol.
        !            71:  */
        !            72: 
        !            73: /* Tunable constants */
        !            74: #define        NQ_CLOCKSKEW    3       /* Clock skew factor (sec) */
        !            75: #define        NQ_WRITESLACK   5       /* Delay for write cache flushing */
        !            76: #define        NQ_MAXLEASE     60      /* Max lease duration (sec) */
        !            77: #define        NQ_MINLEASE     5       /* Min lease duration (sec) */
        !            78: #define        NQ_DEFLEASE     30      /* Default lease duration (sec) */
        !            79: #define        NQ_RENEWAL      3       /* Time before expiry (sec) to renew */
        !            80: #define        NQ_TRYLATERDEL  15      /* Initial try later delay (sec) */
        !            81: #define        NQ_MAXNUMLEASE  2048    /* Upper bound on number of server leases */
        !            82: #define        NQ_DEADTHRESH   NQ_NEVERDEAD    /* Default nm_deadthresh */
        !            83: #define        NQ_NEVERDEAD    9       /* Greater than max. nm_timeouts */
        !            84: #define        NQLCHSZ         256     /* Server hash table size */
        !            85: 
        !            86: #define        NQNFS_PROG      300105  /* As assigned by Sun */
        !            87: #define        NQNFS_VER3      3
        !            88: #define        NQNFS_EVICTSIZ  156     /* Size of eviction request in bytes */
        !            89: 
        !            90: /*
        !            91:  * Definitions used for saving the "last lease expires" time in Non-volatile
        !            92:  * RAM on the server. The default definitions below assume that NOVRAM is not
        !            93:  * available.
        !            94:  */
        !            95: #ifdef HASNVRAM
        !            96: #  undef HASNVRAM
        !            97: #endif
        !            98: #define        NQSTORENOVRAM(t)
        !            99: #define        NQLOADNOVRAM(t)
        !           100: 
        !           101: /*
        !           102:  * Defn and structs used on the server to maintain state for current leases.
        !           103:  * The list of host(s) that hold the lease are kept as nqhost structures.
        !           104:  * The first one lives in nqlease and any others are held in a linked
        !           105:  * list of nqm structures hanging off of nqlease.
        !           106:  *
        !           107:  * Each nqlease structure is chained into two lists. The first is a list
        !           108:  * ordered by increasing expiry time for nqsrv_timer() and the second is a chain
        !           109:  * hashed on lc_fh.
        !           110:  */
        !           111: #define        LC_MOREHOSTSIZ  10
        !           112: 
        !           113: struct nqhost {
        !           114:        union {
        !           115:                struct {
        !           116:                        u_short udp_flag;
        !           117:                        u_short udp_port;
        !           118:                        union nethostaddr udp_haddr;
        !           119:                } un_udp;
        !           120:                struct {
        !           121:                        u_short connless_flag;
        !           122:                        u_short connless_spare;
        !           123:                        union nethostaddr connless_haddr;
        !           124:                } un_connless;
        !           125:                struct {
        !           126:                        u_short conn_flag;
        !           127:                        u_short conn_spare;
        !           128:                        struct nfssvc_sock *conn_slp;
        !           129:                } un_conn;
        !           130:        } lph_un;
        !           131: };
        !           132: #define        lph_flag        lph_un.un_udp.udp_flag
        !           133: #define        lph_port        lph_un.un_udp.udp_port
        !           134: #define        lph_haddr       lph_un.un_udp.udp_haddr
        !           135: #define        lph_inetaddr    lph_un.un_udp.udp_haddr.had_inetaddr
        !           136: #define        lph_claddr      lph_un.un_connless.connless_haddr
        !           137: #define        lph_nam         lph_un.un_connless.connless_haddr.had_nam
        !           138: #define        lph_slp         lph_un.un_conn.conn_slp
        !           139: 
        !           140: struct nqlease {
        !           141:        LIST_ENTRY(nqlease) lc_hash;    /* Fhandle hash list */
        !           142:        CIRCLEQ_ENTRY(nqlease) lc_timer; /* Timer queue list */
        !           143:        time_t          lc_expiry;      /* Expiry time (sec) */
        !           144:        struct nqhost   lc_host;        /* Host that got lease */
        !           145:        struct nqm      *lc_morehosts;  /* Other hosts that share read lease */
        !           146:        fsid_t          lc_fsid;        /* Fhandle */
        !           147:        char            lc_fiddata[MAXFIDSZ];
        !           148:        struct vnode    *lc_vp;         /* Soft reference to associated vnode */
        !           149: };
        !           150: #define        lc_flag         lc_host.lph_un.un_udp.udp_flag
        !           151: 
        !           152: /* lc_flag bits */
        !           153: #define        LC_VALID        0x0001  /* Host address valid */
        !           154: #define        LC_WRITE        0x0002  /* Write cache */
        !           155: #define        LC_NONCACHABLE  0x0004  /* Non-cachable lease */
        !           156: #define        LC_LOCKED       0x0008  /* Locked */
        !           157: #define        LC_WANTED       0x0010  /* Lock wanted */
        !           158: #define        LC_EXPIREDWANTED 0x0020 /* Want lease when expired */
        !           159: #define        LC_UDP          0x0040  /* Host address for udp socket */
        !           160: #define        LC_CLTP         0x0080  /* Host address for other connectionless */
        !           161: #define        LC_LOCAL        0x0100  /* Host is server */
        !           162: #define        LC_VACATED      0x0200  /* Host has vacated lease */
        !           163: #define        LC_WRITTEN      0x0400  /* Recently wrote to the leased file */
        !           164: #define        LC_SREF         0x0800  /* Holds a nfssvc_sock reference */
        !           165: 
        !           166: struct nqm {
        !           167:        struct nqm      *lpm_next;
        !           168:        struct nqhost   lpm_hosts[LC_MOREHOSTSIZ];
        !           169: };
        !           170: 
        !           171: /*
        !           172:  * Special value for slp for local server calls.
        !           173:  */
        !           174: #define        NQLOCALSLP      ((struct nfssvc_sock *) -1)
        !           175: 
        !           176: /*
        !           177:  * Server side macros.
        !           178:  */
        !           179: #define        nqsrv_getl(v, l) \
        !           180:                (void) nqsrv_getlease((v), &nfsd->nd_duration, \
        !           181:                 ((nfsd->nd_flag & ND_LEASE) ? (nfsd->nd_flag & ND_LEASE) : \
        !           182:                 ((l) | ND_CHECK)), \
        !           183:                 slp, procp, nfsd->nd_nam, &cache, &frev, cred)
        !           184: 
        !           185: /*
        !           186:  * Client side macros that check for a valid lease.
        !           187:  */
        !           188: #define        NQNFS_CKINVALID(v, n, f) \
        !           189:  ((time.tv_sec > (n)->n_expiry && \
        !           190:  VFSTONFS((v)->v_mount)->nm_timeouts < VFSTONFS((v)->v_mount)->nm_deadthresh) \
        !           191:   || ((f) == ND_WRITE && ((n)->n_flag & NQNFSWRITE) == 0))
        !           192: 
        !           193: #define        NQNFS_CKCACHABLE(v, f) \
        !           194:  ((time.tv_sec <= VTONFS(v)->n_expiry || \
        !           195:   VFSTONFS((v)->v_mount)->nm_timeouts >= VFSTONFS((v)->v_mount)->nm_deadthresh) \
        !           196:    && (VTONFS(v)->n_flag & NQNFSNONCACHE) == 0 && \
        !           197:    ((f) == ND_READ || (VTONFS(v)->n_flag & NQNFSWRITE)))
        !           198: 
        !           199: #define        NQNFS_NEEDLEASE(v, p) \
        !           200:                (time.tv_sec > VTONFS(v)->n_expiry ? \
        !           201:                 ((VTONFS(v)->n_flag & NQNFSEVICTED) ? 0 : nqnfs_piggy[p]) : \
        !           202:                 (((time.tv_sec + NQ_RENEWAL) > VTONFS(v)->n_expiry && \
        !           203:                   nqnfs_piggy[p]) ? \
        !           204:                   ((VTONFS(v)->n_flag & NQNFSWRITE) ? \
        !           205:                    ND_WRITE : nqnfs_piggy[p]) : 0))
        !           206: 
        !           207: /*
        !           208:  * List head for timer queue.
        !           209:  */
        !           210: extern CIRCLEQ_HEAD(nqtimerhead, nqlease) nqtimerhead;
        !           211: 
        !           212: /*
        !           213:  * List head for the file handle hash table.
        !           214:  */
        !           215: #define        NQFHHASH(f) \
        !           216:        (&nqfhhashtbl[(*((u_long *)(f))) & nqfhhash])
        !           217: extern LIST_HEAD(nqfhhashhead, nqlease) *nqfhhashtbl;
        !           218: extern u_long nqfhhash;
        !           219: 
        !           220: /*
        !           221:  * Nqnfs return status numbers.
        !           222:  */
        !           223: #define        NQNFS_EXPIRED   500
        !           224: #define        NQNFS_TRYLATER  501
        !           225: 
        !           226: #if defined(KERNEL) || defined(_KERNEL)
        !           227: void   nqnfs_lease_check __P((struct vnode *, struct proc *, struct ucred *, int));
        !           228: void   nqnfs_lease_updatetime __P((int));
        !           229: int    nqsrv_getlease __P((struct vnode *, u_long *, int,
        !           230:                            struct nfssvc_sock *, struct proc *,
        !           231:                            struct mbuf *, int *, u_quad_t *,
        !           232:                            struct ucred *));
        !           233: int    nqnfs_getlease __P((struct vnode *,int,struct ucred *,struct proc *));
        !           234: int    nqnfs_callback __P((struct nfsmount *,struct mbuf *,struct mbuf *,caddr_t));
        !           235: int    nqnfs_clientd __P((struct nfsmount *,struct ucred *,struct nfsd_cargs *,int,caddr_t,struct proc *));
        !           236: struct nfsnode;
        !           237: void   nqnfs_clientlease __P((struct nfsmount *, struct nfsnode *, int, int, time_t, u_quad_t));
        !           238: void   nqnfs_serverd __P((void));
        !           239: int    nqnfsrv_getlease __P((struct nfsrv_descript *, struct nfssvc_sock *, struct proc *, struct mbuf **));
        !           240: int    nqnfsrv_vacated __P((struct nfsrv_descript *, struct nfssvc_sock *, struct proc *, struct mbuf **));
        !           241: #endif
        !           242: 
        !           243: #endif

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