197 lines
6.7 KiB
C
197 lines
6.7 KiB
C
/* $NetBSD: coda_namecache.h,v 1.9 2005/12/11 12:19:50 christos 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) && \
|
|
(bcmp(cp->name,name,namelen) == 0))
|
|
|
|
/*
|
|
* Functions to modify the hash and lru chains.
|
|
* insque and remque assume that the pointers are the first thing
|
|
* in the list node, thus the trickery for lru.
|
|
*/
|
|
|
|
#define CODA_NC_HSHINS(elem, pred) insque(elem,pred)
|
|
#define CODA_NC_HSHREM(elem) remque(elem)
|
|
#define CODA_NC_HSHNUL(elem) (elem)->hash_next = \
|
|
(elem)->hash_prev = (elem)
|
|
|
|
#define CODA_NC_LRUINS(elem, pred) insque(LRU_PART(elem), LRU_PART(pred))
|
|
#define CODA_NC_LRUREM(elem) remque(LRU_PART(elem));
|
|
#define CODA_NC_LRUGET(lruhead) LRU_TOP((lruhead).lru_prev)
|
|
|
|
#define CODA_NC_VALID(cncp) (cncp->dcp != (struct cnode *)0)
|
|
|
|
#define LRU_PART(cncp) (struct coda_cache *) \
|
|
((char *)cncp + (2*sizeof(struct coda_cache *)))
|
|
#define LRU_TOP(cncp) (struct coda_cache *) \
|
|
((char *)cncp - (2*sizeof(struct coda_cache *)))
|
|
#define DATA_PART(cncp) (struct coda_cache *) \
|
|
((char *)cncp + (4*sizeof(struct coda_cache *)))
|
|
#define DATA_SIZE (sizeof(struct coda_cache)-(4*sizeof(struct coda_cache *)))
|
|
|
|
/*
|
|
* Structure for an element in the CODA Name Cache.
|
|
* NOTE: I use the position of arguments and their size in the
|
|
* implementation of the functions CODA_NC_LRUINS, CODA_NC_LRUREM, and
|
|
* DATA_PART.
|
|
*/
|
|
|
|
struct coda_cache {
|
|
struct coda_cache *hash_next,*hash_prev; /* Hash list */
|
|
struct coda_cache *lru_next, *lru_prev; /* LRU list */
|
|
struct cnode *cp; /* vnode of the file */
|
|
struct cnode *dcp; /* parent's cnode */
|
|
struct ucred *cred; /* user credentials */
|
|
char name[CODA_NC_NAMELEN]; /* segment name */
|
|
int namelen; /* length of name */
|
|
};
|
|
|
|
struct coda_lru { /* Start of LRU chain */
|
|
char *dummy1, *dummy2; /* place holders */
|
|
struct coda_cache *lru_next, *lru_prev; /* position of pointers is important */
|
|
};
|
|
|
|
|
|
struct coda_hash { /* Start of Hash chain */
|
|
struct coda_cache *hash_next, *hash_prev; /* NOTE: chain pointers must be first */
|
|
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, struct ucred *, struct cnode *);
|
|
extern struct cnode *coda_nc_lookup(struct cnode *, const char *, int, struct ucred *);
|
|
|
|
extern void coda_nc_zapParentfid(CodaFid *, enum dc_status);
|
|
extern void coda_nc_zapfid(CodaFid *, enum dc_status);
|
|
extern void coda_nc_zapvnode(CodaFid *, struct ucred *, 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_ */
|