205 lines
7.2 KiB
C
205 lines
7.2 KiB
C
/*
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Rick Macklem at The University of Guelph.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)nqnfs.h 8.1 (Berkeley) 6/10/93
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* $Id: nqnfs.h,v 1.2 1994/08/02 07:52:28 davidg Exp $
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*/
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#ifndef _NFS_NQNFS_H_
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#define _NFS_NQNFS_H_
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/*
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* Definitions for NQNFS (Not Quite NFS) cache consistency protocol.
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*/
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/* Tunable constants */
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#define NQ_CLOCKSKEW 3 /* Clock skew factor (sec) */
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#define NQ_WRITESLACK 5 /* Delay for write cache flushing */
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#define NQ_MAXLEASE 60 /* Max lease duration (sec) */
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#define NQ_MINLEASE 5 /* Min lease duration (sec) */
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#define NQ_DEFLEASE 30 /* Default lease duration (sec) */
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#define NQ_RENEWAL 3 /* Time before expiry (sec) to renew */
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#define NQ_TRYLATERDEL 15 /* Initial try later delay (sec) */
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#define NQ_MAXNUMLEASE 2048 /* Upper bound on number of server leases */
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#define NQ_DEADTHRESH NQ_NEVERDEAD /* Default nm_deadthresh */
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#define NQ_NEVERDEAD 9 /* Greater than max. nm_timeouts */
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#define NQLCHSZ 256 /* Server hash table size */
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#define NQNFS_PROG 300105 /* As assigned by Sun */
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#define NQNFS_VER1 1
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#define NQNFS_EVICTSIZ 156 /* Size of eviction request in bytes */
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/*
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* Definitions used for saving the "last lease expires" time in Non-volatile
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* RAM on the server. The default definitions below assume that NOVRAM is not
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* available.
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*/
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#define NQSTORENOVRAM(t)
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#define NQLOADNOVRAM(t)
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/*
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* Defn and structs used on the server to maintain state for current leases.
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* The list of host(s) that hold the lease are kept as nqhost structures.
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* The first one lives in nqlease and any others are held in a linked
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* list of nqm structures hanging off of nqlease.
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*
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* Each nqlease structure is chained into two lists. The first is a list
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* ordered by increasing expiry time for nqsrv_timer() and the second is a chain
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* hashed on lc_fh.
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*/
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#define LC_MOREHOSTSIZ 10
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struct nqhost {
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union {
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struct {
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u_short udp_flag;
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u_short udp_port;
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union nethostaddr udp_haddr;
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} un_udp;
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struct {
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u_short connless_flag;
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u_short connless_spare;
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union nethostaddr connless_haddr;
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} un_connless;
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struct {
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u_short conn_flag;
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u_short conn_spare;
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struct nfssvc_sock *conn_slp;
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} un_conn;
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} lph_un;
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};
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#define lph_flag lph_un.un_udp.udp_flag
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#define lph_port lph_un.un_udp.udp_port
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#define lph_haddr lph_un.un_udp.udp_haddr
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#define lph_inetaddr lph_un.un_udp.udp_haddr.had_inetaddr
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#define lph_claddr lph_un.un_connless.connless_haddr
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#define lph_nam lph_un.un_connless.connless_haddr.had_nam
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#define lph_slp lph_un.un_conn.conn_slp
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struct nqlease {
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struct nqlease *lc_chain1[2]; /* Timer queue list (must be first) */
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struct nqlease *lc_fhnext; /* Fhandle hash list */
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struct nqlease **lc_fhprev;
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time_t lc_expiry; /* Expiry time (sec) */
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struct nqhost lc_host; /* Host that got lease */
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struct nqm *lc_morehosts; /* Other hosts that share read lease */
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fsid_t lc_fsid; /* Fhandle */
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char lc_fiddata[MAXFIDSZ];
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struct vnode *lc_vp; /* Soft reference to associated vnode */
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};
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#define lc_flag lc_host.lph_un.un_udp.udp_flag
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/* lc_flag bits */
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#define LC_VALID 0x0001 /* Host address valid */
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#define LC_WRITE 0x0002 /* Write cache */
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#define LC_NONCACHABLE 0x0004 /* Non-cachable lease */
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#define LC_LOCKED 0x0008 /* Locked */
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#define LC_WANTED 0x0010 /* Lock wanted */
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#define LC_EXPIREDWANTED 0x0020 /* Want lease when expired */
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#define LC_UDP 0x0040 /* Host address for udp socket */
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#define LC_CLTP 0x0080 /* Host address for other connectionless */
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#define LC_LOCAL 0x0100 /* Host is server */
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#define LC_VACATED 0x0200 /* Host has vacated lease */
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#define LC_WRITTEN 0x0400 /* Recently wrote to the leased file */
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#define LC_SREF 0x0800 /* Holds a nfssvc_sock reference */
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struct nqm {
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struct nqm *lpm_next;
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struct nqhost lpm_hosts[LC_MOREHOSTSIZ];
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};
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/*
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* Flag bits for flags argument to nqsrv_getlease.
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*/
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#define NQL_READ LEASE_READ /* Read Request */
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#define NQL_WRITE LEASE_WRITE /* Write Request */
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#define NQL_CHECK 0x4 /* Check for lease */
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#define NQL_NOVAL 0xffffffff /* Invalid */
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/*
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* Special value for slp for local server calls.
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*/
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#define NQLOCALSLP ((struct nfssvc_sock *) -1)
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/*
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* Server side macros.
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*/
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#define nqsrv_getl(v, l) \
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(void) nqsrv_getlease((v), &nfsd->nd_duration, \
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((nfsd->nd_nqlflag != 0 && nfsd->nd_nqlflag != NQL_NOVAL) ? nfsd->nd_nqlflag : \
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((l) | NQL_CHECK)), \
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nfsd, nam, &cache, &frev, cred)
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/*
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* Client side macros that check for a valid lease.
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*/
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#define NQNFS_CKINVALID(v, n, f) \
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((time.tv_sec > (n)->n_expiry && \
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VFSTONFS((v)->v_mount)->nm_timeouts < VFSTONFS((v)->v_mount)->nm_deadthresh) \
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|| ((f) == NQL_WRITE && ((n)->n_flag & NQNFSWRITE) == 0))
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#define NQNFS_CKCACHABLE(v, f) \
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((time.tv_sec <= VTONFS(v)->n_expiry || \
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VFSTONFS((v)->v_mount)->nm_timeouts >= VFSTONFS((v)->v_mount)->nm_deadthresh) \
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&& (VTONFS(v)->n_flag & NQNFSNONCACHE) == 0 && \
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((f) == NQL_READ || (VTONFS(v)->n_flag & NQNFSWRITE)))
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#define NQNFS_NEEDLEASE(v, p) \
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(time.tv_sec > VTONFS(v)->n_expiry ? \
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((VTONFS(v)->n_flag & NQNFSEVICTED) ? 0 : nqnfs_piggy[p]) : \
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(((time.tv_sec + NQ_RENEWAL) > VTONFS(v)->n_expiry && \
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nqnfs_piggy[p]) ? \
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((VTONFS(v)->n_flag & NQNFSWRITE) ? \
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NQL_WRITE : nqnfs_piggy[p]) : 0))
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/*
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* List head for timer queue.
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*/
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extern union nqsrvthead {
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union nqsrvthead *th_head[2];
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struct nqlease *th_chain[2];
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} nqthead;
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extern struct nqlease **nqfhead;
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extern u_long nqfheadhash;
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/*
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* Nqnfs return status numbers.
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*/
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#define NQNFS_EXPIRED 500
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#define NQNFS_TRYLATER 501
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#define NQNFS_AUTHERR 502
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#endif
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