76898521e8
Move all extern variable definitions to associated .h files, move some extern variable definitions between include files to place them more appropriately. MFC after: 3 days
202 lines
6.8 KiB
C
202 lines
6.8 KiB
C
/*-
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*
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* Coda: an Experimental Distributed File System
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* Release 3.1
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*
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* Copyright (c) 1987-1998 Carnegie Mellon University
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* All Rights Reserved
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*
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* Permission to use, copy, modify and distribute this software and its
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* documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation, and
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* that credit is given to Carnegie Mellon University in all documents
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* and publicity pertaining to direct or indirect use of this code or its
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* derivatives.
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*
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* CODA IS AN EXPERIMENTAL SOFTWARE SYSTEM AND IS KNOWN TO HAVE BUGS,
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* SOME OF WHICH MAY HAVE SERIOUS CONSEQUENCES. CARNEGIE MELLON ALLOWS
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* FREE USE OF THIS SOFTWARE IN ITS "AS IS" CONDITION. CARNEGIE MELLON
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* DISCLAIMS ANY LIABILITY OF ANY KIND FOR ANY DAMAGES WHATSOEVER
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* RESULTING DIRECTLY OR INDIRECTLY FROM THE USE OF THIS SOFTWARE OR OF
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* ANY DERIVATIVE WORK.
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*
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* Carnegie Mellon encourages users of this software to return any
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* improvements or extensions that they make, and to grant Carnegie
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* Mellon the rights to redistribute these changes without encumbrance.
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*
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* @(#) src/sys/coda/coda_namecache.h,v 1.1.1.1 1998/08/29 21:14:52 rvb Exp $
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* $FreeBSD$
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*
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*/
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/*-
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* Mach Operating System
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* Copyright (c) 1990 Carnegie-Mellon University
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* Copyright (c) 1989 Carnegie-Mellon University
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* All rights reserved. The CMU software License Agreement specifies
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* the terms and conditions for use and redistribution.
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*/
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/*
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* This code was written for the Coda filesystem at Carnegie Mellon University.
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* Contributers include David Steere, James Kistler, and M. Satyanarayanan.
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*/
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#ifndef _CODA_NC_HEADER_
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#define _CODA_NC_HEADER_
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/*
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* Coda constants
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*/
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#define CODA_NC_NAMELEN 15 /* longest name stored in cache */
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#define CODA_NC_CACHESIZE 256 /* Default cache size */
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#define CODA_NC_HASHSIZE 64 /* Must be multiple of 2 */
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/*
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* Hash function for the primary hash.
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*/
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/*
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* First try -- (first + last letters + length + (int)cp) mod size
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* 2nd try -- same, except dir fid.vnode instead of cp
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*/
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#ifdef oldhash
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#define CODA_NC_HASH(name, namelen, cp) \
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((name[0] + name[namelen-1] + namelen + (int)(intptr_t)(cp)) & (coda_nc_hashsize-1))
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#else
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#define CODA_NC_HASH(name, namelen, cp) \
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((name[0] + (name[namelen-1]<<4) + namelen + (((int)(intptr_t)cp)>>8)) & (coda_nc_hashsize-1))
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#endif
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#define CODA_NAMEMATCH(cp, name, namelen, dcp) \
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((namelen == cp->namelen) && (dcp == cp->dcp) && \
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(bcmp(cp->name,name,namelen) == 0))
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/*
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* Functions to modify the hash and lru chains.
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* insque and remque assume that the pointers are the first thing
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* in the list node, thus the trickery for lru.
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*/
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#define CODA_NC_HSHINS(elem, pred) insque(elem,pred)
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#define CODA_NC_HSHREM(elem) remque(elem)
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#define CODA_NC_HSHNUL(elem) (elem)->hash_next = \
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(elem)->hash_prev = (elem)
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#define CODA_NC_LRUINS(elem, pred) insque(LRU_PART(elem), LRU_PART(pred))
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#define CODA_NC_LRUREM(elem) remque(LRU_PART(elem));
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#define CODA_NC_LRUGET(lruhead) LRU_TOP((lruhead).lru_prev)
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#define CODA_NC_VALID(cncp) (cncp->dcp != (struct cnode *)0)
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#define LRU_PART(cncp) (struct coda_cache *) \
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((char *)cncp + (2*sizeof(struct coda_cache *)))
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#define LRU_TOP(cncp) (struct coda_cache *) \
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((char *)cncp - (2*sizeof(struct coda_cache *)))
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#define DATA_PART(cncp) (struct coda_cache *) \
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((char *)cncp + (4*sizeof(struct coda_cache *)))
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#define DATA_SIZE (sizeof(struct coda_cache)-(4*sizeof(struct coda_cache *)))
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/*
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* Structure for an element in the CODA Name Cache.
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* NOTE: I use the position of arguments and their size in the
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* implementation of the functions CODA_NC_LRUINS, CODA_NC_LRUREM, and
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* DATA_PART.
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*/
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struct coda_cache {
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struct coda_cache *hash_next,*hash_prev; /* Hash list */
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struct coda_cache *lru_next, *lru_prev; /* LRU list */
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struct cnode *cp; /* vnode of the file */
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struct cnode *dcp; /* parent's cnode */
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struct ucred *cred; /* user credentials */
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char name[CODA_NC_NAMELEN]; /* segment name */
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int namelen; /* length of name */
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};
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struct coda_lru { /* Start of LRU chain */
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char *dummy1, *dummy2; /* place holders */
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struct coda_cache *lru_next, *lru_prev; /* position of pointers is important */
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};
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struct coda_hash { /* Start of Hash chain */
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struct coda_cache *hash_next, *hash_prev; /* NOTE: chain pointers must be first */
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int length; /* used for tuning purposes */
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};
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/*
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* Symbols to aid in debugging the namecache code. Assumes the existence
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* of the variable coda_nc_debug, which is defined in cfs_namecache.c
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*/
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#define CODA_NC_DEBUG(N, STMT) { if (coda_nc_debug & (1 <<N)) { STMT } }
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/* Prototypes of functions exported within cfs */
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void coda_nc_init(void);
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void coda_nc_enter(struct cnode *, const char *, int, struct ucred *, struct cnode *);
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struct cnode *coda_nc_lookup(struct cnode *, const char *, int, struct ucred *);
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void coda_nc_zapParentfid(CodaFid *, enum dc_status);
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void coda_nc_zapfid(CodaFid *, enum dc_status);
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void coda_nc_zapvnode(CodaFid *, struct ucred *, enum dc_status);
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void coda_nc_zapfile(struct cnode *, const char *, int);
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void coda_nc_purge_user(uid_t, enum dc_status);
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void coda_nc_flush(enum dc_status);
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void print_coda_nc(void);
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void coda_nc_gather_stats(void);
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int coda_nc_resize(int, int, enum dc_status);
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void coda_nc_name(struct cnode *cp);
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/*
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* Global variables tracking and controlling Coda namecache operation.
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*/
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extern int coda_nc_debug; /* Set to enable debugging printfs */
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extern int coda_nc_initialized; /* Set if cache has been initialized */
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extern int coda_nc_use; /* Indicate use of CODA Name Cache */
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/*
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* Structure to contain statistics on the cache usage
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*/
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struct coda_nc_statistics {
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unsigned hits;
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unsigned misses;
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unsigned enters;
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unsigned dbl_enters;
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unsigned long_name_enters;
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unsigned long_name_lookups;
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unsigned long_remove;
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unsigned lru_rm;
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unsigned zapPfids;
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unsigned zapFids;
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unsigned zapFile;
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unsigned zapUsers;
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unsigned Flushes;
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unsigned Sum_bucket_len;
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unsigned Sum2_bucket_len;
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unsigned Max_bucket_len;
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unsigned Num_zero_len;
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unsigned Search_len;
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};
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#define CODA_NC_FIND ((u_long) 1)
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#define CODA_NC_REMOVE ((u_long) 2)
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#define CODA_NC_INIT ((u_long) 3)
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#define CODA_NC_ENTER ((u_long) 4)
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#define CODA_NC_LOOKUP ((u_long) 5)
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#define CODA_NC_ZAPPFID ((u_long) 6)
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#define CODA_NC_ZAPFID ((u_long) 7)
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#define CODA_NC_ZAPVNODE ((u_long) 8)
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#define CODA_NC_ZAPFILE ((u_long) 9)
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#define CODA_NC_PURGEUSER ((u_long) 10)
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#define CODA_NC_FLUSH ((u_long) 11)
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#define CODA_NC_PRINTCODA_NC ((u_long) 12)
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#define CODA_NC_PRINTSTATS ((u_long) 13)
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#endif
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