/* $NetBSD: coda_namecache.h,v 1.12 2009/03/18 15:14:30 cegger Exp $ */
/*
*
* Coda: an Experimental Distributed File System
* Release 3.1
*
* Copyright (c) 1987-1998 Carnegie Mellon University
* All Rights Reserved
*
* Permission to use, copy, modify and distribute this software and its
* documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation, and
* that credit is given to Carnegie Mellon University in all documents
* and publicity pertaining to direct or indirect use of this code or its
* derivatives.
*
* CODA IS AN EXPERIMENTAL SOFTWARE SYSTEM AND IS KNOWN TO HAVE BUGS,
* SOME OF WHICH MAY HAVE SERIOUS CONSEQUENCES. CARNEGIE MELLON ALLOWS
* FREE USE OF THIS SOFTWARE IN ITS "AS IS" CONDITION. CARNEGIE MELLON
* DISCLAIMS ANY LIABILITY OF ANY KIND FOR ANY DAMAGES WHATSOEVER
* RESULTING DIRECTLY OR INDIRECTLY FROM THE USE OF THIS SOFTWARE OR OF
* ANY DERIVATIVE WORK.
*
* Carnegie Mellon encourages users of this software to return any
* improvements or extensions that they make, and to grant Carnegie
* Mellon the rights to redistribute these changes without encumbrance.
*
* @(#) coda/coda_namecache.h,v 1.1.1.1 1998/08/29 21:26:46 rvb Exp $
*/
/*
* Mach Operating System
* Copyright (c) 1990 Carnegie-Mellon University
* Copyright (c) 1989 Carnegie-Mellon University
* All rights reserved. The CMU software License Agreement specifies
* the terms and conditions for use and redistribution.
*/
/*
* This code was written for the Coda file system at Carnegie Mellon University.
* Contributers include David Steere, James Kistler, and M. Satyanarayanan.
*/
#ifndef _CODA_NC_HEADER_
#define _CODA_NC_HEADER_
/*
* Coda constants
*/
#define CODA_NC_NAMELEN 15 /* longest name stored in cache */
#define CODA_NC_CACHESIZE 256 /* Default cache size */
#define CODA_NC_HASHSIZE 64 /* Must be multiple of 2 */
/*
* Hash function for the primary hash.
*/
/*
* First try -- (first + last letters + length + (int)cp) mod size
* 2nd try -- same, except dir fid.vnode instead of cp
*/
#ifdef oldhash
#define CODA_NC_HASH(name, namelen, cp) \
((name[0] + name[namelen-1] + namelen + (int)(long)(cp)) \
& (coda_nc_hashsize-1))
#else
#define CODA_NC_HASH(name, namelen, cp) \
((name[0] + (name[namelen-1]<<4) + namelen + (((int)(long)cp)>>8)) \
& (coda_nc_hashsize-1))
#endif
#define CODA_NAMEMATCH(cp, name, namelen, dcp) \
((namelen == cp->namelen) && (dcp == cp->dcp) && \
(memcmp(cp->name,name,namelen) == 0))
#define CODA_NC_VALID(cncp) (cncp->dcp != (struct cnode *)0)
#define DATA_PART(cncp) (&((cncp)->cp))
#define DATA_SIZE (sizeof(struct coda_cache) - offsetof(struct coda_cache, cp))
/*
* Structure for an element in the CODA Name Cache.
*/
struct coda_cache {
LIST_ENTRY(coda_cache) hash; /* Hash list */
TAILQ_ENTRY(coda_cache) lru; /* LRU list */
struct cnode *cp; /* vnode of the file */
struct cnode *dcp; /* parent's cnode */
kauth_cred_t cred; /* user credentials */
char name[CODA_NC_NAMELEN]; /* segment name */
int namelen; /* length of name */
};
struct coda_lru { /* Start of LRU chain */
TAILQ_HEAD(,coda_cache) head;
};
struct coda_hash { /* Start of Hash chain */
LIST_HEAD(,coda_cache) head;
int length; /* used for tuning purposes */
};
/*
* Symbols to aid in debugging the namecache code. Assumes the existence
* of the variable coda_nc_debug, which is defined in cfs_namecache.c
*/
#define CODA_NC_DEBUG(N, STMT) { if (coda_nc_debug & (1 <<N)) { STMT } }
/* Prototypes of functions exported within cfs */
extern void coda_nc_init(void);
extern void coda_nc_enter(struct cnode *, const char *, int,
kauth_cred_t, struct cnode *);
extern struct cnode *coda_nc_lookup(struct cnode *, const char *, int,
kauth_cred_t);
extern void coda_nc_zapParentfid(CodaFid *, enum dc_status);
extern void coda_nc_zapfid(CodaFid *, enum dc_status);
extern void coda_nc_zapvnode(CodaFid *, kauth_cred_t, enum dc_status);
extern void coda_nc_zapfile(struct cnode *, const char *, int);
extern void coda_nc_purge_user(uid_t, enum dc_status);
extern void coda_nc_flush(enum dc_status);
extern void print_coda_nc(void);
extern void coda_nc_gather_stats(void);
extern int coda_nc_resize(int, int, enum dc_status);
extern void coda_nc_name(struct cnode *cp);
/*
* Structure to contain statistics on the cache usage
*/
struct coda_nc_statistics {
unsigned hits;
unsigned misses;
unsigned enters;
unsigned dbl_enters;
unsigned long_name_enters;
unsigned long_name_lookups;
unsigned long_remove;
unsigned lru_rm;
unsigned zapPfids;
unsigned zapFids;
unsigned zapFile;
unsigned zapUsers;
unsigned Flushes;
unsigned Sum_bucket_len;
unsigned Sum2_bucket_len;
unsigned Max_bucket_len;
unsigned Num_zero_len;
unsigned Search_len;
};
#define CODA_NC_FIND ((u_long) 1)
#define CODA_NC_REMOVE ((u_long) 2)
#define CODA_NC_INIT ((u_long) 3)
#define CODA_NC_ENTER ((u_long) 4)
#define CODA_NC_LOOKUP ((u_long) 5)
#define CODA_NC_ZAPPFID ((u_long) 6)
#define CODA_NC_ZAPFID ((u_long) 7)
#define CODA_NC_ZAPVNODE ((u_long) 8)
#define CODA_NC_ZAPFILE ((u_long) 9)
#define CODA_NC_PURGEUSER ((u_long) 10)
#define CODA_NC_FLUSH ((u_long) 11)
#define CODA_NC_PRINTCODA_NC ((u_long) 12)
#define CODA_NC_PRINTSTATS ((u_long) 13)
#endif /* _CFSNC_HEADER_ */