277 lines
8.7 KiB
C
277 lines
8.7 KiB
C
/*
|
|
|
|
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_ */
|