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NetBSD/sys/coda/coda_namecache.h
rvb 2eec68d743 Very Preliminary Coda
1998-08-29 21:26:45 +00:00

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/*
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.
*/
/* $Header: /cvsroot/src/sys/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.
*/
/*
* HISTORY
* $Log: coda_namecache.h,v $
* Revision 1.1.1.1 1998/08/29 21:26:46 rvb
* Very Preliminary Coda
*
* Revision 1.8 1998/08/28 18:12:25 rvb
* Now it also works on FreeBSD -current. This code will be
* committed to the FreeBSD -current and NetBSD -current
* trees. It will then be tailored to the particular platform
* by flushing conditional code.
*
* Revision 1.7 1998/08/18 17:05:24 rvb
* Don't use __RCSID now
*
* Revision 1.6 1998/08/18 16:31:49 rvb
* Sync the code for NetBSD -current; test on 1.3 later
*
* Revision 1.5 98/01/23 11:53:51 rvb
* Bring RVB_CFS1_1 to HEAD
*
* Revision 1.4.2.1 97/12/16 12:40:23 rvb
* Sync with 1.3
*
* Revision 1.4 97/12/05 10:39:29 rvb
* Read CHANGES
*
* Revision 1.3.4.3 97/11/24 15:44:51 rvb
* Final cfs_venus.c w/o macros, but one locking bug
*
* Revision 1.3.4.2 97/11/12 12:09:44 rvb
* reorg pass1
*
* Revision 1.3.4.1 97/11/06 21:06:05 rvb
* don't include headers in headers
*
* Revision 1.3 97/08/05 11:08:19 lily
* Removed cfsnc_replace, replaced it with a cfs_find, unhash, and
* rehash. This fixes a cnode leak and a bug in which the fid is
* not actually replaced. (cfs_namecache.c, cfsnc.h, cfs_subr.c)
*
* Revision 1.2 96/01/02 16:57:19 bnoble
* Added support for Coda MiniCache and raw inode calls (final commit)
*
* Revision 1.1.2.1 1995/12/20 01:57:45 bnoble
* Added CFS-specific files
*
* Revision 3.1.1.1 1995/03/04 19:08:22 bnoble
* Branch for NetBSD port revisions
*
* Revision 3.1 1995/03/04 19:08:21 bnoble
* Bump to major revision 3 to prepare for NetBSD port
*
* Revision 2.2 1994/08/28 19:37:39 luqi
* Add a new CFS_REPLACE call to allow venus to replace a ViceFid in the
* mini-cache.
*
* In "cfs.h":
* Add CFS_REPLACE decl.
*
* In "cfs_namecache.c":
* Add routine cfsnc_replace.
*
* In "cfs_subr.c":
* Add case-statement to process CFS_REPLACE.
*
* In "cfsnc.h":
* Add decl for CFSNC_REPLACE.
*
* Revision 2.1 94/07/21 16:25:27 satya
* Conversion to C++ 3.0; start of Coda Release 2.0
*
* Revision 1.2 92/10/27 17:58:34 lily
* merge kernel/latest and alpha/src/cfs
*
* Revision 2.2 90/07/05 11:27:04 mrt
* Created for the Coda File System.
* [90/05/23 dcs]
*
* Revision 1.4 90/05/31 17:02:12 dcs
* Prepare for merge with facilities kernel.
*
*
*/
#ifndef _CFSNC_HEADER_
#define _CFSNC_HEADER_
/*
* Cfs constants
*/
#define CFSNC_NAMELEN 15 /* longest name stored in cache */
#define CFSNC_CACHESIZE 256 /* Default cache size */
#define CFSNC_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 CFSNC_HASH(name, namelen, cp) \
((name[0] + name[namelen-1] + namelen + (int)(cp)) & (cfsnc_hashsize-1))
#else
#define CFSNC_HASH(name, namelen, cp) \
((name[0] + (name[namelen-1]<<4) + namelen + (((int)cp)>>8)) & (cfsnc_hashsize-1))
#endif
#define CFS_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 CFSNC_HSHINS(elem, pred) insque(elem,pred)
#define CFSNC_HSHREM(elem) remque(elem)
#define CFSNC_HSHNUL(elem) (elem)->hash_next = \
(elem)->hash_prev = (elem)
#define CFSNC_LRUINS(elem, pred) insque(LRU_PART(elem), LRU_PART(pred))
#define CFSNC_LRUREM(elem) remque(LRU_PART(elem));
#define CFSNC_LRUGET(lruhead) LRU_TOP((lruhead).lru_prev)
#define CFSNC_VALID(cncp) (cncp->dcp != (struct cnode *)0)
#define LRU_PART(cncp) (struct cfscache *) \
((char *)cncp + (2*sizeof(struct cfscache *)))
#define LRU_TOP(cncp) (struct cfscache *) \
((char *)cncp - (2*sizeof(struct cfscache *)))
#define DATA_PART(cncp) (struct cfscache *) \
((char *)cncp + (4*sizeof(struct cfscache *)))
#define DATA_SIZE (sizeof(struct cfscache)-(4*sizeof(struct cfscache *)))
/*
* Structure for an element in the CFS Name Cache.
* NOTE: I use the position of arguments and their size in the
* implementation of the functions CFSNC_LRUINS, CFSNC_LRUREM, and
* DATA_PART.
*/
struct cfscache {
struct cfscache *hash_next,*hash_prev; /* Hash list */
struct cfscache *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[CFSNC_NAMELEN]; /* segment name */
int namelen; /* length of name */
};
struct cfslru { /* Start of LRU chain */
char *dummy1, *dummy2; /* place holders */
struct cfscache *lru_next, *lru_prev; /* position of pointers is important */
};
struct cfshash { /* Start of Hash chain */
struct cfscache *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 cfsnc_debug, which is defined in cfs_namecache.c
*/
#define CFSNC_DEBUG(N, STMT) { if (cfsnc_debug & (1 <<N)) { STMT } }
/* Prototypes of functions exported within cfs */
extern void cfsnc_init(void);
extern void cfsnc_enter(struct cnode *, const char *, int, struct ucred *, struct cnode *);
extern struct cnode *cfsnc_lookup(struct cnode *, const char *, int, struct ucred *);
extern void cfsnc_zapParentfid(ViceFid *, enum dc_status);
extern void cfsnc_zapfid(ViceFid *, enum dc_status);
extern void cfsnc_zapvnode(ViceFid *, struct ucred *, enum dc_status);
extern void cfsnc_zapfile(struct cnode *, const char *, int);
extern void cfsnc_purge_user(vuid_t, enum dc_status);
extern void cfsnc_flush(enum dc_status);
extern void print_cfsnc(void);
extern void cfsnc_gather_stats(void);
extern int cfsnc_resize(int, int, enum dc_status);
extern void cfsnc_name(struct cnode *cp);
/*
* Structure to contain statistics on the cache usage
*/
struct cfsnc_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 CFSNC_FIND ((u_long) 1)
#define CFSNC_REMOVE ((u_long) 2)
#define CFSNC_INIT ((u_long) 3)
#define CFSNC_ENTER ((u_long) 4)
#define CFSNC_LOOKUP ((u_long) 5)
#define CFSNC_ZAPPFID ((u_long) 6)
#define CFSNC_ZAPFID ((u_long) 7)
#define CFSNC_ZAPVNODE ((u_long) 8)
#define CFSNC_ZAPFILE ((u_long) 9)
#define CFSNC_PURGEUSER ((u_long) 10)
#define CFSNC_FLUSH ((u_long) 11)
#define CFSNC_PRINTCFSNC ((u_long) 12)
#define CFSNC_PRINTSTATS ((u_long) 13)
#endif /* _CFSNC_HEADER_ */
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