patch-2.1.70 linux/include/linux/coda_namecache.h

• Lines: 161
• Date: Tue Dec 2 14:24:04 1997
• Orig file: v2.1.69/linux/include/linux/coda_namecache.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.69/linux/include/linux/coda_namecache.h linux/include/linux/coda_namecache.h
@@ -0,0 +1,160 @@
+/* 
+ * 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
+ * cfsnc.h,v
+ * Revision 1.2  1996/01/02 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_
+
+#include "coda.h"
+#include "coda_cnode.h"
+
+
+/*
+ * 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 */
+/*
+ * Structure for an element in the CFS Name Cache.
+ */
+
+/* roughly 50 bytes per entry */
+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 CodaCred	*cred;			/* user credentials */
+	char		name[CFSNC_NAMELEN];	/* segment name */
+	int		namelen;		/* length of name */
+};
+
+
+
+/* exported */
+void cfsnc_init(void);
+void cfsnc_enter(struct cnode *dcp, register const char *name, int namelen, struct cnode *cp);
+struct cnode *cfsnc_lookup(struct cnode *dcp, register const char *name, int namelen);
+void cfsnc_zapParentfid(ViceFid *fid);
+void cfsnc_zapfid(ViceFid *fid);
+void cfsnc_zapfile(struct cnode *dcp, register const char *name, int length);
+void cfsnc_purge_user(struct CodaCred *cred);
+void cfsnc_flush(void);
+void cfsnc_replace(ViceFid *f1, ViceFid *f2);
+void print_cfsnc(void);
+void coda_print_ce(struct cfscache *);
+int cfsnc_resize(int hashsize, int heapsize);
+ 
+  
+
+/* #define CFSNC_VALID(cncp)	( (cncp->dcp != (struct cnode *)0) && (cncp->cp->c_flags & C_VATTR) ) */
+#define CFSNC_VALID(cncp)	    (cncp->dcp != (struct cnode *)0) 
+ 
+#define DATA_PART(cncp)				(struct cfscache *) \
+			((char *)cncp + (4*sizeof(struct cfscache *)))
+#define DATA_SIZE	(sizeof(struct cfscache)-(4*sizeof(struct cfscache *)))
+
+/*
+ * 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;
+};
+
+/* 
+ * Symbols to aid in debugging the namecache code. Assumes the existence
+ * of the variable cfsnc_debug, which is defined in cfs_namecache.c
+ */
+extern int cfsnc_debug;
+#define CFSNC_DEBUG(N, STMT)     { if (cfsnc_debug & (1 <<N)) { STMT } }
+
+#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)
+#define CFSNC_REPLACE		((u_long) 14)
+
+#endif _CFSNC_HEADER_