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/*
* 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 8.1 (Berkeley) 6/10/93
* $Id$
*/
/*
* 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_VER1 1
#define NQNFS_EVICTSIZ 156 /* Size of eviction request in bytes */
/*
* 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.
*/
#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 {
union {
struct {
u_short udp_flag;
u_short udp_port;
union nethostaddr udp_haddr;
} un_udp;
struct {
u_short connless_flag;
u_short connless_spare;
union nethostaddr connless_haddr;
} un_connless;
struct {
u_short conn_flag;
u_short conn_spare;
struct nfssvc_sock *conn_slp;
} un_conn;
} lph_un;
};
#define lph_flag lph_un.un_udp.udp_flag
#define lph_port lph_un.un_udp.udp_port
#define lph_haddr lph_un.un_udp.udp_haddr
#define lph_inetaddr lph_un.un_udp.udp_haddr.had_inetaddr
#define lph_claddr lph_un.un_connless.connless_haddr
#define lph_nam lph_un.un_connless.connless_haddr.had_nam
#define lph_slp lph_un.un_conn.conn_slp
struct nqlease {
struct nqlease *lc_chain1[2]; /* Timer queue list (must be first) */
struct nqlease *lc_fhnext; /* Fhandle hash list */
struct nqlease **lc_fhprev;
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_un.un_udp.udp_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 */
#define LC_CLTP 0x0080 /* Host address for other connectionless */
#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];
};
/*
* Flag bits for flags argument to nqsrv_getlease.
*/
#define NQL_READ LEASE_READ /* Read Request */
#define NQL_WRITE LEASE_WRITE /* Write Request */
#define NQL_CHECK 0x4 /* Check for lease */
#define NQL_NOVAL 0xffffffff /* Invalid */
/*
* 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_nqlflag != 0 && nfsd->nd_nqlflag != NQL_NOVAL) ? nfsd->nd_nqlflag : \
((l) | NQL_CHECK)), \
nfsd, nam, &cache, &frev, cred)
/*
* Client side macros that check for a valid lease.
*/
#define NQNFS_CKINVALID(v, n, f) \
((time.tv_sec > (n)->n_expiry && \
VFSTONFS((v)->v_mount)->nm_timeouts < VFSTONFS((v)->v_mount)->nm_deadthresh) \
|| ((f) == NQL_WRITE && ((n)->n_flag & NQNFSWRITE) == 0))
#define NQNFS_CKCACHABLE(v, f) \
((time.tv_sec <= VTONFS(v)->n_expiry || \
VFSTONFS((v)->v_mount)->nm_timeouts >= VFSTONFS((v)->v_mount)->nm_deadthresh) \
&& (VTONFS(v)->n_flag & NQNFSNONCACHE) == 0 && \
((f) == NQL_READ || (VTONFS(v)->n_flag & NQNFSWRITE)))
#define NQNFS_NEEDLEASE(v, p) \
(time.tv_sec > VTONFS(v)->n_expiry ? \
((VTONFS(v)->n_flag & NQNFSEVICTED) ? 0 : nqnfs_piggy[p]) : \
(((time.tv_sec + NQ_RENEWAL) > VTONFS(v)->n_expiry && \
nqnfs_piggy[p]) ? \
((VTONFS(v)->n_flag & NQNFSWRITE) ? \
NQL_WRITE : nqnfs_piggy[p]) : 0))
/*
* List head for timer queue.
*/
extern union nqsrvthead {
union nqsrvthead *th_head[2];
struct nqlease *th_chain[2];
} nqthead;
extern struct nqlease **nqfhead;
extern u_long nqfheadhash;
/*
* Nqnfs return status numbers.
*/
#define NQNFS_EXPIRED 500
#define NQNFS_TRYLATER 501
#define NQNFS_AUTHERR 502
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