simple-cache.c 68.1 KB
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/*
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 * $Id: simple-cache.c,v 0.109 2003/08/11 22:16:28 ceder Exp $
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 * Copyright (C) 1991-2002  Lysator Academic Computer Association.
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 *
 * This file is part of the LysKOM server.
 * 
 * LysKOM is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by 
 * the Free Software Foundation; either version 1, or (at your option) 
 * any later version.
 * 
 * LysKOM is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with LysKOM; see the file COPYING.  If not, write to
 * Lysator, c/o ISY, Linkoping University, S-581 83 Linkoping, SWEDEN,
 * or the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, 
 * MA 02139, USA.
 *
 * Please mail bug reports to bug-lyskom@lysator.liu.se. 
 */
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/*
 * This module contains some simple simulations of the routines in
 * cache.c.
 *
 * Extracted from ram-cache.c and rewritten by ceder.
 *
 * New database format with texts in their own file by Inge Wallin.
 *
 * New save algorithm by ceder.
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 * Attempt at newer algorithm by byers (FASTSAVE)
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 */

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#ifdef HAVE_CONFIG_H
#  include <config.h>
#endif

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#include <errno.h>
#include <stdio.h>
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#ifdef HAVE_STDLIB_H
#   include <stdlib.h>
#endif
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#include <sys/types.h>
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#ifdef HAVE_UNISTD_H
#   include <unistd.h>
#endif
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#ifdef HAVE_STRING_H
#  include <string.h>
#endif
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#ifndef SEEK_END
#  include <fcntl.h>
#endif
#ifndef SEEK_END
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#  define SEEK_SET 0
#  define SEEK_END 2
#endif
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#include "timewrap.h"
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#include <setjmp.h>

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#include "ldifftime.h"
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#include "exp.h"
#include "misc-types.h"
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#include "s-string.h"
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#include "kom-types.h"
#include "cache-node.h"
#include "cache.h"
#include "parser.h"
#include "ram-parse.h"
#include "ram-output.h"
#include "server/smalloc.h"
#include "kom-memory.h"
#include "lyskomd.h"
#include "debug.h"
#include "kom-errno.h"
#include "log.h"
#include "com.h"
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#include "async.h"
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#include "connections.h"
#include "send-async.h"
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#include "param.h"
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#include "kom-config.h"
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#include "admin.h"
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#include "unused.h"
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#include "local-to-global.h"
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#include "server-time.h"
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#include "eintr.h"
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#include "timeval-util.h"
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#include "stats.h"
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#ifdef DEBUG_CALLS
#  include "services.h"
#  include "manipulate.h"
#endif
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/*
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 * Possible improvements:
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 *
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 *  FIXME (bug 167): When there are consecutive items in file A that
 *  shall be copied to file B, copy them in one transfer (up to a
 *  certain limit).
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 */

/*
 * All functions that can fail sets kom_errno to a suitable value
 * if they fail.
 */

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static Small_conf      ** small_conf_arr;
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static Cache_node_mcb	* pers_mcb;
static Cache_node_mcb 	* conf_mcb;
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static Conf_no		  next_free_num = 1;
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static Cache_node_mcb 	* text_mcb;
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static Text_no		  next_text_num = 1;
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/*
 * The elements in the following lists with same index refers to the same
 * conference.
 */
static int    no_of_match_info;
EXPORT Matching_info *match_table = NULL;

static FILE	*text_file= NULL;
static FILE	*file_a = NULL;	/* Current file. */
static FILE	*file_b = NULL;	/* File under construction. */
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#ifdef FASTSAVE
static FILE     *file_b_r = NULL; /* Read from file under construction */
#endif
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/*
 * Four state variables for the background save.
 */
static enum {
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    sync_idle,
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    sync_save_conf,
    sync_save_pers,
    sync_save_text,
    sync_error,
    sync_wait,
    sync_ready
} sync_state;

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/* The state machine sync_state works like this:
 *
 *  Old state              action           new state
 *  none               sync_part called     sync_idle
 *                     for the first time
 *  sync_idle	       SYNC_INTERVAL        sync_save_conf
 *  sync_save_conf     all confs saved      sync_save_pers
 *  sync_save_pers     all persons saved    sync_save_text
 *  sync_save_text     all texts saved      sync_ready
 *  sync_ready         sync_part called     sync_idle
 *  any                error occurs         sync_error
 *  sync_error         sync_part called     sync_wait
 *  sync_wait          SYNC_RETRY_INTERVAL  sync_save_conf
 */

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#ifndef FASTSAVE
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/* sync_next should be split in next_text_to_sync and
   next_conf_to_sync to avoid warnings about the different sizes of
   Conf_no and Text_no.  Since that is indeed done if FASTSAVE is set,
   don't bother doing it in the old code that will anyhow soon be
   replaced. */
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static unsigned long sync_next;
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#endif
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static Conf_no highest_conf_no = 0;
static Text_no highest_text_no = 0;
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BUGDECL;

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#ifdef DEBUG_CALLS

/* This is used by cache_sync_start() and cache_sync_finish().  */
static int block_after_pre_sync = 0;

#endif

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/* Define LOGACCESSES if you want to be able to log all accesses to
   the data base. */

#ifdef LOGACCESSES
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enum log_type {
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    lt_restart,
    lt_text_stat,
    lt_text_mass,
    lt_conf_stat,
    lt_pers_stat,
    
    lt_text_def,
    lt_conf_def,
    lt_pers_def,

    lt_create_text,
    lt_garb_text,
    lt_delete_text,
    lt_create_conf,
    lt_delete_conf,
    lt_create_pers,
    lt_delete_pers,

    lt_lock_conf,
    lt_unlock_conf,
    lt_lock_pers,
    lt_unlock_pers,

    lt_get_highest,		/* Get highest Local_text_no for a conf. */
    lt_get_conf_type
    /* Note: mark_*_as_changed is not logged. */
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};
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static FILE *logfile = NULL;
static int syncing_or_saving = 0;
static int garb_running = 0;

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static void log_access(enum log_type t,
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		       int id)
{
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    extern int putw(int, FILE *);

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    if (garb_running + syncing_or_saving == 0)
    {
	putc(t, logfile);
	putw(id, logfile);
    }
}
#define LOGACC(a,b) {if (logfile) log_access(a, b);}
#else
#define LOGACC(a,b)
#endif

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static Static_server_info boottime_info = {
    0, 0, EMPTY_STRING_i, 0, 0, 0, 0, 0
};

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/* Local functions */

static Success build_matching_info(void);
static Success rebuild_matching_info_entry(Conf_no conf_no);
static Matching_info *find_matching_info(Conf_no conf_no);



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/* Macros */

#define TRACE2(format, arg) if ( buglevel > 2 ) printf(format, arg)
#define TRACE1(format) if ( buglevel > 2 ) printf(format)
#define TRACESTR(str)  if ( buglevel > 2 ) s_puts(str)


static Person *
read_person(FILE *fp,
	    long pos,
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	    long UNUSED(size))	/* FIXME (bug 168): sanity-check the size */
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{
    Person *p;
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    long dummy;
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    p = alloc_person();
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    fseek(fp, pos+1, SEEK_SET);	/* Skip 'P' */
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    dummy = fparse_long(fp);
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    if ( fparse_person(fp, p) != OK )
    {
	free_person(p);
	return NULL;
    }
    else
	return p;
}



static Conference *
read_conference(FILE *fp,
		long pos,
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		long UNUSED(size)) /* FIXME (bug 169): sanity-check the size */
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{
    Conference *c;
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    long dummy;
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    c = alloc_conference();
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    fseek(fp, pos+1, SEEK_SET);	/* Skip 'C' */
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    dummy = fparse_long(fp);
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    if ( fparse_conference(fp, c) != OK )
    {
	free_conference(c);
	return NULL;
    }
    else
	return c;
}
	

static Text_stat *
read_text_stat(FILE *fp,
	       long pos,
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	       long UNUSED(size)) /* FIXME (bug 170): sanity-check the size */
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{
    Text_stat *t;
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    long dummy;
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    t = alloc_text_stat();
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    fseek(fp, pos+1, SEEK_SET);	/* Skip 'T' */
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    dummy = fparse_long(fp);
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    if ( fparse_text_stat(fp, t) != OK )
    {
	free_text_stat(t);
	return NULL;
    }
    else
	return t;
}

static void
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pers_set_mru(Pers_no pers_no)
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{
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    set_mru(pers_mcb, pers_no);
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}

static void
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text_set_mru(Text_no text_no)
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{
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    set_mru(text_mcb, text_no);
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}

static void
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conf_set_mru(Conf_no conf_no)
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{
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    set_mru(conf_mcb, conf_no);
}
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static Cache_node *
get_pers_node(Pers_no pers_no)
{
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    if (pers_no >= next_free_num || pers_no < 1)
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	return NULL;

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    return get_cache_node(pers_mcb, pers_no);
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}

static void
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unlink_text_lru (Cache_node *node)
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{
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    unlink_lru (node, &text_mcb->lru, &text_mcb->mru);
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}

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static void
unlink_conf_lru (Cache_node *node)
{
    unlink_lru (node, &conf_mcb->lru, &conf_mcb->mru);
}
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static void
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unlink_pers_lru (Cache_node *node)
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{
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    unlink_lru (node, &pers_mcb->lru, &pers_mcb->mru);
}
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static Cache_node *
get_conf_node(Conf_no conf_no)
{
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    if (conf_no >= next_free_num || conf_no < 1)
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	return NULL;

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    return get_cache_node(conf_mcb, conf_no);
}
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static Cache_node *
get_text_node(Text_no text_no)
{
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    if (text_no >= next_text_num || text_no < 1)
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	return NULL;

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    return get_cache_node(text_mcb, text_no);
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}

	
/*
 * Name caching routines
 */

/*
 * change_name changes the cached conference name. It is only called when
 * a conference name is changed or a conference is deleted.
 */
void
cached_change_name( Conf_no name_num,
		    String new_name )
{
    if ( name_num < 1 || name_num >= next_free_num )
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	restart_kom("cached_change_name(%d, ----): next_free_num==%d\n",
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		    name_num, next_free_num);

    s_clear( &small_conf_arr[name_num]->name );
    s_strcpy( &small_conf_arr[name_num]->name, new_name);
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    rebuild_matching_info_entry(name_num);
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}


extern Conf_type
cached_get_conf_type (Conf_no conf_no)
{
    if ( conf_no < 1 || conf_no >= next_free_num )
	restart_kom("cached_get_conf_type(%d): next_free_num==%d",
		    conf_no, next_free_num);
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    if ( small_conf_arr [ conf_no ] == NULL )
	restart_kom("cached_get_conf_type(%d): conference does not exist.\n",
		    conf_no);

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    LOGACC(lt_get_conf_type, conf_no);

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    return small_conf_arr [ conf_no ]->type;
}

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extern Conf_no
cached_get_conf_supervisor(Conf_no conf_no)
{
    if (conf_no < 1 || conf_no >= next_free_num)
	restart_kom("cached_get_conf_supervisor(%d): next_free_num==%d\n",
		    conf_no, next_free_num);

    if (small_conf_arr[conf_no] == NULL)
	restart_kom("cached_get_conf_supervisor(%d):"
		    " conference does not exist.\n", conf_no);

    LOGACC(lt_get_conf_supervisor, conf_no);

    return small_conf_arr[conf_no]->supervisor;
}

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/*
 * Return number of conferences present.  (Actually, return a number
 * at least as large as the number of conferences present).
 */
extern Conf_no
cached_no_of_existing_conferences(void)
{
    return next_free_num;	/* This is too large, but who cares? */
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    /* Actually, this is used in lookup_regexp (and maybe other
       places) to allocate an array this large, and that is pretty
       stupid if many conferences have been deleted.  But it is no big
       deal.  Not yet, anyhow...  */
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    /* FIXME (bug 164): We should return a better estimate. */
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}
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/*
 * Various function calls to tell the cache that something is changed.
 */

void
mark_person_as_changed(Pers_no	pers_no)
{
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    Cache_node *node;

    node = get_pers_node(pers_no);
    
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    TRACE2("Person %d is changed\n", pers_no);
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    if ( node == NULL || node->s.exists == 0)
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	restart_kom("mark_person_as_changed(%d): nonexistent.\n", pers_no);

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    node->s.dirty = 1;
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    pers_set_mru( pers_no );
}

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/*
 * Mark the conference as dirty, so that it will be written to
 * the disk.
 *
 * Also update all fields in the Small_conf except then name, so that
 * they are always current.
 *
 * NOTE: You must call cached_change_name when the name changes.
 *       It is not necessary to call cached_change_name after
 *       cached_create_conf.
 */
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void
mark_conference_as_changed(Conf_no	conf_no)
{
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    Cache_node *node;
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    Conference *conf_c;
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    node = get_conf_node (conf_no);

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    TRACE2("Conf.  %d is changed\n", conf_no);
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    if ( node == NULL || node->s.exists == 0)
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	restart_kom("mark_conference_as_changed(%d): nonexistent.\n", conf_no);

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    node->s.dirty = 1;
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    conf_set_mru( conf_no );
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    conf_c = (Conference *) node->ptr;

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    small_conf_arr[conf_no]->highest_local_no
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	= l2g_first_appendable_key(&conf_c->texts) - 1;
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    small_conf_arr[conf_no]->nice = conf_c->nice;
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    small_conf_arr[conf_no]->keep_commented = conf_c->keep_commented;
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    small_conf_arr[conf_no]->type = conf_c->type;
    small_conf_arr[conf_no]->supervisor = conf_c->supervisor;
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}

void
mark_text_as_changed( Text_no text_no )
{
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    Cache_node *node;

    node = get_text_node (text_no);

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    TRACE2("Text %lu is changed.\n", text_no);
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    if ( text_no < 1 || text_no >= next_text_num
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	|| node == NULL || node->s.exists == 0)
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    {
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	restart_kom("mark_text_as_changed(%lu): nonexistent.\n", text_no);
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    }

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    node->s.dirty = 1;
    text_set_mru (text_no);
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}    


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/*
 * Store and retrieve the highest number used.
 */

static int
write_number_file(void)
{
    FILE *fp;

    if ((fp = i_fopen(param.numberfile_tmp_name, "w")) == NULL)
    {
	kom_log("opening %s: %s\n", param.numberfile_tmp_name,
		strerror(errno));
	return -1;
    }
    fprintf(fp, "Text_no: %lu Conf_no: %lu End.\n",
	    (unsigned long)next_text_num,
	    (unsigned long)next_free_num);
    if (fflush(fp) != 0)
    {
	kom_log("fflush to %s failed\n", param.numberfile_tmp_name);
	i_fclose(fp);
	return -1;
    }

    if (ferror(fp) != 0)
    {
	kom_log("fprintf to %s failed\n", param.numberfile_tmp_name);
	i_fclose(fp);
	return -1;
    }

    if (i_fclose(fp) != 0)
    {
	kom_log("fclose %s failed\n", param.numberfile_tmp_name);
	return -1;
    }

    if (i_rename(param.numberfile_tmp_name, param.numberfile_name) != 0)
    {
	kom_log("failed to rename %s to %s: %s\n",
		param.numberfile_tmp_name, param.numberfile_name,
		strerror(errno));
	return -1;
    }
    return 0;
}

static void
read_number_file(void)
{
    FILE *fp;
    unsigned long txt = 0;
    unsigned long cno = 0;
    Text_no text_no;
    Conf_no conf_no;

    if ((fp = i_fopen(param.numberfile_name, "r")) == NULL)
    {
	if (errno == ENOENT)
	    kom_log("WARN: %s: No such file\n", param.numberfile_name);
	else
	    restart_kom("opening %s: %s\n", param.numberfile_name,
			strerror(errno));
	return;
    }
    if (fscanf(fp, "Text_no: %lu Conf_no: %lu", &txt, &cno) != 2
	|| getc(fp) != ' ' || getc(fp) != 'E' || getc(fp) != 'n'
	|| getc(fp) != 'd' || getc(fp) != '.')
    {
	kom_log("WARN: %s: broken file (ignored)\n", param.numberfile_name);
	i_fclose(fp);
	return;
    }
    i_fclose(fp);

    text_no = txt;
    conf_no = cno;
    
    if (text_no > next_text_num)
    {
	kom_log("WARN: Texts %lu - %lu were lost.\n",
		(unsigned long)next_text_num,
		(unsigned long)text_no - 1);
	next_text_num = text_no;
    }
    if (conf_no > next_free_num)
    {
	kom_log("WARN: Confs %lu - %lu were lost.\n",
		(unsigned long)next_free_num,
		(unsigned long)conf_no - 1);
	next_free_num = conf_no;
    }
}
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/*
 * Person-related calls
 */


extern Success
cached_create_person( Pers_no person )
{
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    Cache_node *node;

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    TRACE2("Person %d is being created.\n", person);

    if ( person < 1 || person >= next_free_num )
    {
	restart_kom("cached_create_person(%d): next_free_num == %d.\n",
		    person, next_free_num);
    }

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    if ( get_pers_node(person) != NULL )
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    {
	restart_kom("cached_create_person(%d): Person existed.\n",
		    person);
    }

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    create_cache_node (pers_mcb, person);
    node = get_pers_node (person);

    if ( node == NULL )
	restart_kom("cached_create_person(): couldn't get cache_node.\n");
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    node->ptr = alloc_person();
    node->s.dirty = 1;
    node->s.exists = 1;
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    pers_set_mru( person );
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    LOGACC(lt_create_pers, person);

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    return OK;
}


extern Person *
cached_get_person_stat( Pers_no	person )
{
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    Cache_node *node;

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    TRACE2("cached_get_person_stat %d\n", person);

    if ( person == 0 )
    {
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        err_stat = 0;
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	kom_errno = KOM_CONF_ZERO;
	return NULL;
    }
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    if ( person >= next_free_num )
    {
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        err_stat = person;
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	kom_errno = KOM_UNDEF_PERS;
	return NULL;
    }

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    node = get_pers_node (person);

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    if ( node == NULL || node->s.exists == 0 )
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    {
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        err_stat = person;
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	kom_errno = KOM_UNDEF_PERS;
	return NULL;
    }

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    LOGACC(lt_pers_stat, person);

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    if ( node->ptr != NULL )
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    {
	pers_set_mru( person );
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	++pers_mcb->hits;
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	return node->ptr;
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    }

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    if ( node->snap_shot != NULL )
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    {
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	node->ptr = copy_person (node->snap_shot);
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	pers_set_mru (person);
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	++pers_mcb->hits;
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	return node->ptr;
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    }

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    node->ptr = read_person(file_a, node->pos, node->size);
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    ++pers_mcb->misses;
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    pers_set_mru (person);
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    return node->ptr;
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}


/*
 * Conference-related calls
 */
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static int no_of_allocated_small_confs = 0;

static void
free_small_conf (Small_conf *sc)
{
    if ( sc != NULL )
    {
	--no_of_allocated_small_confs;
	s_clear ( &sc->name );
	sfree (sc);
    }
}


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static void
init_small_conf(Small_conf *sc)
{
    sc->name = EMPTY_STRING;
    init_conf_type(&sc->type);
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    sc->supervisor = 0;
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    sc->highest_local_no = 0;
    sc->nice = param.default_nice;
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    sc->keep_commented = param.default_keep_commented;
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}

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static Small_conf *
alloc_small_conf(void)
{
    Small_conf *s;
    s = smalloc(sizeof(Small_conf));
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    init_small_conf(s);
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    ++no_of_allocated_small_confs;

    return s;
}


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/*
 * Create a conference.
 *
 * Set up a Conference and cache the name in the small_conf_array.
 */
extern Conf_no
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cached_create_conf (String  name)
{
    Conference * conf_c;
    Conf_no	 conf_no;
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    Cache_node  *node;
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    TRACE1("cached_create_conf( ");
    TRACESTR(name);
    TRACE1(" )\n");

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    if ( next_free_num >= param.max_conf )
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    {
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        err_stat = next_free_num;
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	kom_errno = KOM_INDEX_OUT_OF_RANGE;
	return 0;
    }
    
    conf_no = next_free_num++;

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    if (write_number_file() < 0)
    {
	next_free_num--;
	err_stat = 0;
	kom_errno = KOM_TEMPFAIL;
	return 0;
    }

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    create_cache_node (conf_mcb, conf_no);
    node = get_conf_node (conf_no);

    if ( node == NULL )
	restart_kom("cached_create_conf(): failed to allocate cache_node.\n");
    
    node->s.exists = 1;
    node->s.dirty = 1;
    node->ptr = conf_c = alloc_conference();
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    conf_set_mru(conf_no);    

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    zero_init_cache_node (pers_mcb, conf_no);
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    small_conf_arr[ conf_no ] = alloc_small_conf();

    conf_c->name = EMPTY_STRING;
    s_strcpy(&conf_c->name, name);
    cached_change_name( conf_no, name);

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    TRACE2("Created conference number %d\n", conf_no);
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    LOGACC(lt_create_conf, conf_no);

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    return conf_no;
}


extern Success
cached_delete_conf( Conf_no	conf )
{
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    Cache_node *node;

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    if ( conf == 0 )
    {
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        err_stat = conf;
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	kom_errno = KOM_CONF_ZERO;
	return FAILURE;
    }
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    if ( conf >= next_free_num )
    {
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        err_stat = conf;
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	kom_errno = KOM_UNDEF_CONF;
	return FAILURE;
    }

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    node = get_conf_node (conf);

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    if ( node == NULL || node->s.exists == 0 )
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    {
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        err_stat = conf;
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	kom_errno = KOM_UNDEF_CONF;
	return FAILURE;
    }

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    if ( node->lock_cnt > 0 )
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	kom_log("WNG: cached_delete_conf(%d): lock_cnt === %d\n",
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	    conf, node->lock_cnt);
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    free_small_conf(small_conf_arr[conf]);
    small_conf_arr[conf] = NULL;

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    free_conference(node->ptr);
    node->ptr = NULL;
    node->s.exists = 0;
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    LOGACC(lt_delete_conf, conf);

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    rebuild_matching_info_entry(conf);
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    return OK;
}

Success
cached_delete_person(Pers_no pers)
{
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    Cache_node *node;

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    if ( pers == 0 )
    {
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        err_stat = pers;
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	kom_errno = KOM_CONF_ZERO;
	return FAILURE;
    }
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    if ( pers >= next_free_num )
    {
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	kom_log("cached_delete_person(%lu): next_free_num == %lu\n",
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	    (unsigned long)pers, (unsigned long)next_free_num);
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        err_stat = pers;
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	kom_errno = KOM_UNDEF_PERS;
	return FAILURE;
    }

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    node = get_pers_node (pers);

    if ( pers >= next_free_num || node == NULL || node->s.exists == 0 )
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    {
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	kom_log("cached_delete_person(): attempt to delete void person.\n");
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        err_stat = pers;
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	kom_errno = KOM_UNDEF_PERS;
	return FAILURE;
    }

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    if ( node->lock_cnt > 0 )
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	kom_log("cached_delete_pers(%lu): lock_cnt === %lu\n",
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	    (unsigned long)pers, (unsigned long)node->lock_cnt);
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    LOGACC(lt_delete_pers, pers);

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    free_person (node->ptr);
    node->ptr = NULL;
    node->s.exists = 0;
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    return OK;
}

Success
cached_delete_text(Text_no text)
{
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    Cache_node *node;

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    if ( text == 0 )
    {
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        err_stat = text;
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	kom_errno = KOM_TEXT_ZERO;
	return FAILURE;
    }
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    node = get_text_node (text);

    if ( text >= next_text_num || node == NULL
	|| node->s.exists == 0 )
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    {
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	kom_log("cached_delete_text(): attempt to delete void text %lu.\n", text);
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        err_stat = text;
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	kom_errno = KOM_NO_SUCH_TEXT;
	return FAILURE;
    }

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    if ( node->lock_cnt > 0 )
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	kom_log("cached_delete_text(%lu): lock_cnt === %d\n",
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	    text, node->lock_cnt);
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    free_text_stat(node->ptr);
    node->ptr = NULL;
    node->s.exists = 0;
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#ifdef LOGACCESSES
    if (garb_running)
    {
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	LOGACC(lt_garb_text, text);
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    }
    else
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	LOGACC(lt_delete_text, text);
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#endif
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    return OK;
}


extern Conference *
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cached_get_conf_stat (Conf_no   conf_no)
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{
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    Cache_node *node;

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    TRACE2("cached_get_conf_stat %d\n", conf_no);

    if ( conf_no == 0 )
    {
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        err_stat = conf_no;
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	kom_errno = KOM_CONF_ZERO;
	return NULL;
    }
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    node = get_conf_node (conf_no);

    if ( conf_no >= next_free_num || node == NULL || node->s.exists == 0 )
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    {
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        err_stat = conf_no;
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	kom_errno = KOM_UNDEF_CONF;
	return NULL;
    }

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    LOGACC(lt_conf_stat, conf_no);

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    if ( node->ptr != NULL )
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    {
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	conf_set_mru (conf_no);
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	++conf_mcb->hits;
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	return node->ptr;
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    }

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    if ( node->snap_shot != NULL )
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    {
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	node->ptr = copy_conference (node->snap_shot);
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	conf_set_mru (conf_no);
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	++conf_mcb->hits;
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	return node->ptr;
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    }

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    node->ptr = read_conference(file_a, node->pos, node->size);
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    ++conf_mcb->misses;
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    conf_set_mru (conf_no);
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    return node->ptr;
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}

/*
 * Return TRUE if conf_no exists.
 */
Bool
cached_conf_exists(Conf_no conf_no)
{
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    if (conf_no == 0 || conf_no >= next_free_num )
	return FALSE;

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    return small_conf_arr[conf_no] != NULL ? TRUE : FALSE;
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}

    
/*
 * Calls to handle texts
 */

/*
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 * FIXME (bug 171): cached_get_text() should return Success.
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 */
extern String
cached_get_text( Text_no text )
{
    String  the_string;
    Text_stat *t_stat;

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    TRACE2("cached_get_text %lu\n", text);
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    if ( (t_stat = cached_get_text_stat (text)) == NULL )
	return EMPTY_STRING;
    else
    {
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	LOGACC(lt_text_mass, text);
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	the_string.string = tmp_alloc( t_stat->no_of_chars );
	the_string.len = t_stat->no_of_chars;
	fseek(text_file, t_stat->file_pos, SEEK_SET);

	if ( fread(the_string.string, sizeof(char), the_string.len, text_file)
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	    != (size_t)the_string.len )
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	{
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	    kom_log("WARNING: cached_get_text: premature end on text %lu\n",
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		text);
	    return EMPTY_STRING;
	}
		    
	return the_string;
    }
}


extern Text_stat *	/* NULL on error */
cached_get_text_stat(	Text_no