277 lines
8.7 KiB
C
277 lines
8.7 KiB
C
/*
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Coda: an Experimental Distributed File System
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Release 3.1
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Copyright (c) 1987-1998 Carnegie Mellon University
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All Rights Reserved
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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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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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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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/* $Header: /cvsroot/src/sys/cfs/Attic/cfsnc.h,v 1.1.1.1 1998/08/29 21:26:46 rvb Exp $ */
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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 file system 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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/*
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* HISTORY
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* $Log: cfsnc.h,v $
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* Revision 1.1.1.1 1998/08/29 21:26:46 rvb
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* Very Preliminary Coda
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*
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* Revision 1.8 1998/08/28 18:12:25 rvb
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* Now it also works on FreeBSD -current. This code will be
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* committed to the FreeBSD -current and NetBSD -current
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* trees. It will then be tailored to the particular platform
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* by flushing conditional code.
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*
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* Revision 1.7 1998/08/18 17:05:24 rvb
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* Don't use __RCSID now
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*
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* Revision 1.6 1998/08/18 16:31:49 rvb
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* Sync the code for NetBSD -current; test on 1.3 later
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*
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* Revision 1.5 98/01/23 11:53:51 rvb
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* Bring RVB_CFS1_1 to HEAD
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*
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* Revision 1.4.2.1 97/12/16 12:40:23 rvb
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* Sync with 1.3
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*
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* Revision 1.4 97/12/05 10:39:29 rvb
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* Read CHANGES
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*
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* Revision 1.3.4.3 97/11/24 15:44:51 rvb
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* Final cfs_venus.c w/o macros, but one locking bug
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*
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* Revision 1.3.4.2 97/11/12 12:09:44 rvb
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* reorg pass1
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*
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* Revision 1.3.4.1 97/11/06 21:06:05 rvb
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* don't include headers in headers
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*
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* Revision 1.3 97/08/05 11:08:19 lily
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* Removed cfsnc_replace, replaced it with a cfs_find, unhash, and
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* rehash. This fixes a cnode leak and a bug in which the fid is
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* not actually replaced. (cfs_namecache.c, cfsnc.h, cfs_subr.c)
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*
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* Revision 1.2 96/01/02 16:57:19 bnoble
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* Added support for Coda MiniCache and raw inode calls (final commit)
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*
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* Revision 1.1.2.1 1995/12/20 01:57:45 bnoble
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* Added CFS-specific files
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*
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* Revision 3.1.1.1 1995/03/04 19:08:22 bnoble
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* Branch for NetBSD port revisions
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*
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* Revision 3.1 1995/03/04 19:08:21 bnoble
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* Bump to major revision 3 to prepare for NetBSD port
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*
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* Revision 2.2 1994/08/28 19:37:39 luqi
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* Add a new CFS_REPLACE call to allow venus to replace a ViceFid in the
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* mini-cache.
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*
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* In "cfs.h":
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* Add CFS_REPLACE decl.
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*
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* In "cfs_namecache.c":
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* Add routine cfsnc_replace.
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*
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* In "cfs_subr.c":
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* Add case-statement to process CFS_REPLACE.
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*
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* In "cfsnc.h":
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* Add decl for CFSNC_REPLACE.
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*
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* Revision 2.1 94/07/21 16:25:27 satya
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* Conversion to C++ 3.0; start of Coda Release 2.0
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*
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* Revision 1.2 92/10/27 17:58:34 lily
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* merge kernel/latest and alpha/src/cfs
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*
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* Revision 2.2 90/07/05 11:27:04 mrt
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* Created for the Coda File System.
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* [90/05/23 dcs]
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*
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* Revision 1.4 90/05/31 17:02:12 dcs
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* Prepare for merge with facilities kernel.
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*
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*
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*/
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#ifndef _CFSNC_HEADER_
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#define _CFSNC_HEADER_
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/*
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* Cfs constants
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*/
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#define CFSNC_NAMELEN 15 /* longest name stored in cache */
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#define CFSNC_CACHESIZE 256 /* Default cache size */
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#define CFSNC_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 CFSNC_HASH(name, namelen, cp) \
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((name[0] + name[namelen-1] + namelen + (int)(cp)) & (cfsnc_hashsize-1))
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#else
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#define CFSNC_HASH(name, namelen, cp) \
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((name[0] + (name[namelen-1]<<4) + namelen + (((int)cp)>>8)) & (cfsnc_hashsize-1))
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#endif
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#define CFS_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 CFSNC_HSHINS(elem, pred) insque(elem,pred)
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#define CFSNC_HSHREM(elem) remque(elem)
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#define CFSNC_HSHNUL(elem) (elem)->hash_next = \
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(elem)->hash_prev = (elem)
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#define CFSNC_LRUINS(elem, pred) insque(LRU_PART(elem), LRU_PART(pred))
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#define CFSNC_LRUREM(elem) remque(LRU_PART(elem));
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#define CFSNC_LRUGET(lruhead) LRU_TOP((lruhead).lru_prev)
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#define CFSNC_VALID(cncp) (cncp->dcp != (struct cnode *)0)
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#define LRU_PART(cncp) (struct cfscache *) \
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((char *)cncp + (2*sizeof(struct cfscache *)))
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#define LRU_TOP(cncp) (struct cfscache *) \
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((char *)cncp - (2*sizeof(struct cfscache *)))
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#define DATA_PART(cncp) (struct cfscache *) \
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((char *)cncp + (4*sizeof(struct cfscache *)))
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#define DATA_SIZE (sizeof(struct cfscache)-(4*sizeof(struct cfscache *)))
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/*
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* Structure for an element in the CFS 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 CFSNC_LRUINS, CFSNC_LRUREM, and
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* DATA_PART.
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*/
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struct cfscache {
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struct cfscache *hash_next,*hash_prev; /* Hash list */
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struct cfscache *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[CFSNC_NAMELEN]; /* segment name */
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int namelen; /* length of name */
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};
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struct cfslru { /* Start of LRU chain */
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char *dummy1, *dummy2; /* place holders */
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struct cfscache *lru_next, *lru_prev; /* position of pointers is important */
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};
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struct cfshash { /* Start of Hash chain */
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struct cfscache *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 cfsnc_debug, which is defined in cfs_namecache.c
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*/
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#define CFSNC_DEBUG(N, STMT) { if (cfsnc_debug & (1 <<N)) { STMT } }
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/* Prototypes of functions exported within cfs */
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extern void cfsnc_init(void);
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extern void cfsnc_enter(struct cnode *, const char *, int, struct ucred *, struct cnode *);
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extern struct cnode *cfsnc_lookup(struct cnode *, const char *, int, struct ucred *);
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extern void cfsnc_zapParentfid(ViceFid *, enum dc_status);
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extern void cfsnc_zapfid(ViceFid *, enum dc_status);
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extern void cfsnc_zapvnode(ViceFid *, struct ucred *, enum dc_status);
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extern void cfsnc_zapfile(struct cnode *, const char *, int);
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extern void cfsnc_purge_user(vuid_t, enum dc_status);
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extern void cfsnc_flush(enum dc_status);
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extern void print_cfsnc(void);
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extern void cfsnc_gather_stats(void);
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extern int cfsnc_resize(int, int, enum dc_status);
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extern void cfsnc_name(struct cnode *cp);
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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 cfsnc_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 CFSNC_FIND ((u_long) 1)
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#define CFSNC_REMOVE ((u_long) 2)
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#define CFSNC_INIT ((u_long) 3)
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#define CFSNC_ENTER ((u_long) 4)
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#define CFSNC_LOOKUP ((u_long) 5)
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#define CFSNC_ZAPPFID ((u_long) 6)
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#define CFSNC_ZAPFID ((u_long) 7)
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#define CFSNC_ZAPVNODE ((u_long) 8)
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#define CFSNC_ZAPFILE ((u_long) 9)
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#define CFSNC_PURGEUSER ((u_long) 10)
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#define CFSNC_FLUSH ((u_long) 11)
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#define CFSNC_PRINTCFSNC ((u_long) 12)
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#define CFSNC_PRINTSTATS ((u_long) 13)
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#endif /* _CFSNC_HEADER_ */
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