simple-cache.c 48.9 KB
Newer Older
Linus Tolke Y's avatar
Linus Tolke Y committed
1
/*
2
 * $Id: simple-cache.c,v 0.55 1996/07/26 01:50:12 ceder Exp $
Per Cederqvist's avatar
Per Cederqvist committed
3
 * Copyright (C) 1991, 1992, 1993, 1994, 1995  Lysator Academic Computer Association.
Linus Tolke Y's avatar
Linus Tolke Y committed
4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
 *
 * 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. 
 */
Per Cederqvist's avatar
Per Cederqvist committed
25 26 27 28 29 30 31 32 33 34 35
/*
 * 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.
 */

36
static char *rcsid = "$Id: simple-cache.c,v 0.55 1996/07/26 01:50:12 ceder Exp $";
37 38
#include "rcs.h"
USE(rcsid);
Per Cederqvist's avatar
Per Cederqvist committed
39

Per Cederqvist's avatar
Per Cederqvist committed
40 41
#include <errno.h>
#include <stdio.h>
Per Cederqvist's avatar
Per Cederqvist committed
42
#include <sys/types.h>
43 44 45
#ifdef HAVE_STRING_H
#  include <string.h>
#endif
46
#include <unistd.h>
Per Cederqvist's avatar
Per Cederqvist committed
47 48 49 50
#ifndef SEEK_END
#  include <fcntl.h>
#endif
#ifndef SEEK_END
Per Cederqvist's avatar
Per Cederqvist committed
51 52 53
#  define SEEK_SET 0
#  define SEEK_END 2
#endif
Per Cederqvist's avatar
Per Cederqvist committed
54 55
#include <time.h>
#include <setjmp.h>
56 57 58
#ifdef HAVE_STDARG_H
#  include <stdarg.h>
#endif
Per Cederqvist's avatar
Per Cederqvist committed
59

60
#include "ldifftime.h"
Per Cederqvist's avatar
Per Cederqvist committed
61 62
#include "exp.h"
#include "misc-types.h"
63
#include "s-string.h"
Per Cederqvist's avatar
Per Cederqvist committed
64 65 66 67 68 69 70 71 72 73 74 75 76 77
#include "kom-types.h"
#include "tmp-limits.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"
78
#include "async.h"
Per Cederqvist's avatar
Per Cederqvist committed
79 80
#include "connections.h"
#include "send-async.h"
81
#include "param.h"
Per Cederqvist's avatar
Per Cederqvist committed
82
#include "config.h"
David Byers's avatar
David Byers committed
83
#include "admin.h"
Per Cederqvist's avatar
Per Cederqvist committed
84 85 86 87 88 89 90 91 92 93 94 95 96 97 98

/*
 * Possible improvements: +++
 *  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).
 *
 *  In pre_sync: compute size of, and allocate disk space for file B.
 */

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

static Small_conf	* small_conf_arr[ MAX_CONF ];
99 100
static Cache_node_mcb	* pers_mcb;
static Cache_node_mcb 	* conf_mcb;
Per Cederqvist's avatar
Per Cederqvist committed
101 102
static int		  next_free_num = 1;

103 104
static Cache_node_mcb 	* text_mcb;
static int		  next_text_num = 1;
Per Cederqvist's avatar
Per Cederqvist committed
105 106 107 108 109 110 111

/*
 * 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;
Per Cederqvist's avatar
Per Cederqvist committed
112
EXPORT Conf_no       *conf_table  = NULL; /* Used in conference.c. */
Per Cederqvist's avatar
Per Cederqvist committed
113 114 115 116 117 118 119 120 121 122


static FILE	*text_file= NULL;
static FILE	*file_a = NULL;	/* Current file. */
static FILE	*file_b = NULL;	/* File under construction. */

/*
 * Four state variables for the background save.
 */
static enum {
123
    sync_idle,
Per Cederqvist's avatar
Per Cederqvist committed
124 125 126 127 128 129 130 131
    sync_save_conf,
    sync_save_pers,
    sync_save_text,
    sync_error,
    sync_wait,
    sync_ready
} sync_state;

132 133 134 135 136 137 138 139 140 141 142 143 144 145 146
/* 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
 */

Per Cederqvist's avatar
Per Cederqvist committed
147 148 149 150 151 152 153
static long sync_next;

static Conf_no highest_conf_no;
static Text_no highest_text_no;

BUGDECL;

154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193
/* Define LOGACCESSES if you want to be able to log all accesses to
   the data base. */

#ifdef LOGACCESSES
typedef enum {
    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. */
} Log_type;

static FILE *logfile = NULL;
static int syncing_or_saving = 0;
static int garb_running = 0;

static void log_access(Log_type t,
		       int id)
{
194 195
    extern int putw(int, FILE *);

196 197 198 199 200 201 202 203 204 205 206
    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

Per Cederqvist's avatar
Per Cederqvist committed
207 208 209 210 211 212 213 214 215 216 217 218 219 220

/* 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,
	    long size)
{
    Person *p;
David Byers's avatar
David Byers committed
221
    long dummy;
Per Cederqvist's avatar
Per Cederqvist committed
222 223 224

    p = alloc_person();
    fseek(fp, pos+1, SEEK_SET);	/* Skip '+' */
David Byers's avatar
David Byers committed
225
    dummy = fparse_long(fp);
Per Cederqvist's avatar
Per Cederqvist committed
226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242
    if ( fparse_person(fp, p) != OK )
    {
	free_person(p);
	return NULL;
    }
    else
	return p;
}



static Conference *
read_conference(FILE *fp,
		long pos,
		long size)
{
    Conference *c;
David Byers's avatar
David Byers committed
243
    long dummy;
Per Cederqvist's avatar
Per Cederqvist committed
244 245 246

    c = alloc_conference();
    fseek(fp, pos+1, SEEK_SET);	/* Skip '+' */
David Byers's avatar
David Byers committed
247
    dummy = fparse_long(fp);
Per Cederqvist's avatar
Per Cederqvist committed
248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263
    if ( fparse_conference(fp, c) != OK )
    {
	free_conference(c);
	return NULL;
    }
    else
	return c;
}
	

static Text_stat *
read_text_stat(FILE *fp,
	       long pos,
	       long size)
{
    Text_stat *t;
David Byers's avatar
David Byers committed
264
    long dummy;
Per Cederqvist's avatar
Per Cederqvist committed
265 266 267

    t = alloc_text_stat();
    fseek(fp, pos+1, SEEK_SET);	/* Skip '+' */
David Byers's avatar
David Byers committed
268
    dummy = fparse_long(fp);
Per Cederqvist's avatar
Per Cederqvist committed
269 270 271 272 273 274 275 276 277 278
    if ( fparse_text_stat(fp, t) != OK )
    {
	free_text_stat(t);
	return NULL;
    }
    else
	return t;
}

static void
279
pers_set_mru(Pers_no pers_no)
Per Cederqvist's avatar
Per Cederqvist committed
280
{
281
    set_mru(pers_mcb, pers_no);
Per Cederqvist's avatar
Per Cederqvist committed
282 283 284
}

static void
285
text_set_mru(Text_no text_no)
Per Cederqvist's avatar
Per Cederqvist committed
286
{
287
    set_mru(text_mcb, text_no);
Per Cederqvist's avatar
Per Cederqvist committed
288 289 290
}

static void
291
conf_set_mru(Conf_no conf_no)
Per Cederqvist's avatar
Per Cederqvist committed
292
{
293 294
    set_mru(conf_mcb, conf_no);
}
Per Cederqvist's avatar
Per Cederqvist committed
295

296 297 298
static Cache_node *
get_pers_node(Pers_no pers_no)
{
299 300 301
    if ( pers_no >= next_free_num )
	return NULL;

302
    return get_cache_node(pers_mcb, pers_no);
Per Cederqvist's avatar
Per Cederqvist committed
303 304 305
}

static void
306
unlink_text_lru (Cache_node *node)
Per Cederqvist's avatar
Per Cederqvist committed
307
{
308
    unlink_lru (node, &text_mcb->lru, &text_mcb->mru);
Per Cederqvist's avatar
Per Cederqvist committed
309 310
}

311 312 313 314 315
static void
unlink_conf_lru (Cache_node *node)
{
    unlink_lru (node, &conf_mcb->lru, &conf_mcb->mru);
}
Per Cederqvist's avatar
Per Cederqvist committed
316 317

static void
318
unlink_pers_lru (Cache_node *node)
Per Cederqvist's avatar
Per Cederqvist committed
319
{
320 321
    unlink_lru (node, &pers_mcb->lru, &pers_mcb->mru);
}
Per Cederqvist's avatar
Per Cederqvist committed
322

323 324 325
static Cache_node *
get_conf_node(Conf_no conf_no)
{
326 327 328
    if ( conf_no >= next_free_num )
	return NULL;

329 330
    return get_cache_node(conf_mcb, conf_no);
}
Per Cederqvist's avatar
Per Cederqvist committed
331

332 333 334
static Cache_node *
get_text_node(Text_no text_no)
{
335 336 337
    if ( text_no >= next_text_num )
	return NULL;

338
    return get_cache_node(text_mcb, text_no);
Per Cederqvist's avatar
Per Cederqvist committed
339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369
}

	
/*
 * 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 )
	restart_kom("cached_change_name(%d, ----): next_free_num==%d",
		    name_num, next_free_num);

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


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);
370 371 372 373 374

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

375 376
    LOGACC(lt_get_conf_type, conf_no);

Per Cederqvist's avatar
Per Cederqvist committed
377 378 379
    return small_conf_arr [ conf_no ]->type;
}

380 381 382 383 384 385 386 387 388
/*
 * 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? */
}
Per Cederqvist's avatar
Per Cederqvist committed
389 390 391 392 393 394 395 396

/*
 * Various function calls to tell the cache that something is changed.
 */

void
mark_person_as_changed(Pers_no	pers_no)
{
397 398 399 400
    Cache_node *node;

    node = get_pers_node(pers_no);
    
Per Cederqvist's avatar
Per Cederqvist committed
401
    TRACE2("Person %d is changed\n", pers_no);
402
    if ( node == NULL || node->s.exists == 0)
Per Cederqvist's avatar
Per Cederqvist committed
403 404
	restart_kom("mark_person_as_changed(%d): nonexistent.\n", pers_no);

405
    node->s.dirty = 1;
Per Cederqvist's avatar
Per Cederqvist committed
406 407 408
    pers_set_mru( pers_no );
}

409 410 411 412 413 414 415 416 417 418 419
/*
 * 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.
 */
Per Cederqvist's avatar
Per Cederqvist committed
420 421 422 423

void
mark_conference_as_changed(Conf_no	conf_no)
{
424
    Cache_node *node;
425
    Conference *conf_c;
426 427 428

    node = get_conf_node (conf_no);

Per Cederqvist's avatar
Per Cederqvist committed
429
    TRACE2("Conf.  %d is changed\n", conf_no);
430
    if ( node == NULL || node->s.exists == 0)
Per Cederqvist's avatar
Per Cederqvist committed
431 432
	restart_kom("mark_conference_as_changed(%d): nonexistent.\n", conf_no);

433
    node->s.dirty = 1;
Per Cederqvist's avatar
Per Cederqvist committed
434
    conf_set_mru( conf_no );
435 436 437

    conf_c = (Conference *) node->ptr;

Per Cederqvist's avatar
Per Cederqvist committed
438
    small_conf_arr[ conf_no ]->highest_local_no
439 440 441 442
	= (conf_c->texts.first_local_no - 1 + conf_c->texts.no_of_texts );

    small_conf_arr[ conf_no ]->nice = conf_c->nice;
    small_conf_arr[ conf_no ]->type = conf_c->type;
Per Cederqvist's avatar
Per Cederqvist committed
443 444 445 446 447
}

void
mark_text_as_changed( Text_no text_no )
{
448 449 450 451
    Cache_node *node;

    node = get_text_node (text_no);

452
    TRACE2("Text %lu is changed.\n", text_no);
Per Cederqvist's avatar
Per Cederqvist committed
453
    if ( text_no < 1 || text_no >= next_text_num
454
	|| node == NULL || node->s.exists == 0)
Per Cederqvist's avatar
Per Cederqvist committed
455 456 457 458
    {
	restart_kom("mark_text_as_changed(%d): nonexistent.\n", text_no);
    }

459 460
    node->s.dirty = 1;
    text_set_mru (text_no);
Per Cederqvist's avatar
Per Cederqvist committed
461 462 463 464 465 466 467 468 469 470 471 472
}    



/*
 * Person-related calls
 */


extern Success
cached_create_person( Pers_no person )
{
473 474
    Cache_node *node;

Per Cederqvist's avatar
Per Cederqvist committed
475 476 477 478 479 480 481 482
    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);
    }

483
    if ( get_pers_node(person) != NULL )
Per Cederqvist's avatar
Per Cederqvist committed
484 485 486 487 488
    {
	restart_kom("cached_create_person(%d): Person existed.\n",
		    person);
    }

489 490 491 492 493
    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");
494

495 496 497
    node->ptr = alloc_person();
    node->s.dirty = 1;
    node->s.exists = 1;
Per Cederqvist's avatar
Per Cederqvist committed
498
    pers_set_mru( person );
499 500 501

    LOGACC(lt_create_pers, person);

Per Cederqvist's avatar
Per Cederqvist committed
502 503 504 505 506 507 508
    return OK;
}


extern Person *
cached_get_person_stat( Pers_no	person )
{
509 510
    Cache_node *node;

Per Cederqvist's avatar
Per Cederqvist committed
511 512 513 514 515 516 517
    TRACE2("cached_get_person_stat %d\n", person);

    if ( person == 0 )
    {
	kom_errno = KOM_CONF_ZERO;
	return NULL;
    }
518

519 520 521 522 523 524
    if ( person >= next_free_num )
    {
	kom_errno = KOM_UNDEF_PERS;
	return NULL;
    }

525 526
    node = get_pers_node (person);

527
    if ( node == NULL || node->s.exists == 0 )
Per Cederqvist's avatar
Per Cederqvist committed
528 529 530 531 532
    {
	kom_errno = KOM_UNDEF_PERS;
	return NULL;
    }

533 534
    LOGACC(lt_pers_stat, person);

535
    if ( node->ptr != NULL )
Per Cederqvist's avatar
Per Cederqvist committed
536 537
    {
	pers_set_mru( person );
538
	++pers_mcb->hits;
539
	return node->ptr;
Per Cederqvist's avatar
Per Cederqvist committed
540 541
    }

542
    if ( node->snap_shot != NULL )
Per Cederqvist's avatar
Per Cederqvist committed
543
    {
544
	node->ptr = copy_person (node->snap_shot);
Per Cederqvist's avatar
Per Cederqvist committed
545
	pers_set_mru (person);
546
	++pers_mcb->hits;
547
	return node->ptr;
Per Cederqvist's avatar
Per Cederqvist committed
548 549
    }

550
    node->ptr = read_person(file_a, node->pos, node->size);
Per Cederqvist's avatar
Per Cederqvist committed
551

552
    ++pers_mcb->misses;
Per Cederqvist's avatar
Per Cederqvist committed
553
    pers_set_mru (person);
554
    return node->ptr;
Per Cederqvist's avatar
Per Cederqvist committed
555 556 557 558 559 560
}


/*
 * Conference-related calls
 */
561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576


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);
    }
}


577 578 579 580 581 582 583 584 585
static void
init_small_conf(Small_conf *sc)
{
    sc->name = EMPTY_STRING;
    init_conf_type(&sc->type);
    sc->highest_local_no = 0;
    sc->nice = param.default_nice;
}

586 587 588 589 590
static Small_conf *
alloc_small_conf(void)
{
    Small_conf *s;
    s = smalloc(sizeof(Small_conf));
591
    init_small_conf(s);
592 593 594 595 596 597
    ++no_of_allocated_small_confs;

    return s;
}


598 599 600 601 602 603
/*
 * Create a conference.
 *
 * Set up a Conference and cache the name in the small_conf_array.
 */
extern Conf_no
Per Cederqvist's avatar
Per Cederqvist committed
604 605 606 607
cached_create_conf (String  name)
{
    Conference * conf_c;
    Conf_no	 conf_no;
608
    Cache_node  *node;
Per Cederqvist's avatar
Per Cederqvist committed
609 610 611 612 613 614 615 616 617 618 619 620 621

    TRACE1("cached_create_conf( ");
    TRACESTR(name);
    TRACE1(" )\n");

    if ( next_free_num >= MAX_CONF )
    {
	kom_errno = KOM_INDEX_OUT_OF_RANGE;
	return 0;
    }
    
    conf_no = next_free_num++;

622 623 624 625 626 627 628 629 630
    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();
Per Cederqvist's avatar
Per Cederqvist committed
631 632
    conf_set_mru(conf_no);    

633
    zero_init_cache_node (pers_mcb, conf_no);
Per Cederqvist's avatar
Per Cederqvist committed
634 635 636 637 638 639
    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);

640
    TRACE2("Created conference number %d\n", conf_no);
641 642 643

    LOGACC(lt_create_conf, conf_no);

Per Cederqvist's avatar
Per Cederqvist committed
644 645 646 647 648 649 650
    return conf_no;
}


extern Success
cached_delete_conf( Conf_no	conf )
{
651 652
    Cache_node *node;

Per Cederqvist's avatar
Per Cederqvist committed
653 654 655 656 657
    if ( conf == 0 )
    {
	kom_errno = KOM_CONF_ZERO;
	return FAILURE;
    }
658

659 660 661 662 663 664
    if ( conf >= next_free_num )
    {
	kom_errno = KOM_UNDEF_CONF;
	return FAILURE;
    }

665 666
    node = get_conf_node (conf);

667
    if ( node == NULL || node->s.exists == 0 )
Per Cederqvist's avatar
Per Cederqvist committed
668 669 670 671 672
    {
	kom_errno = KOM_UNDEF_CONF;
	return FAILURE;
    }

673 674 675
    if ( node->lock_cnt > 0 )
	log("WNG: cached_delete_conf(%d): lock_cnt === %d\n",
	    conf, node->lock_cnt);
Per Cederqvist's avatar
Per Cederqvist committed
676

677 678 679
    free_conference(node->ptr);
    node->ptr = NULL;
    node->s.exists = 0;
Per Cederqvist's avatar
Per Cederqvist committed
680

681 682
    LOGACC(lt_delete_conf, conf);

Per Cederqvist's avatar
Per Cederqvist committed
683 684 685 686 687 688
    return OK;
}

Success
cached_delete_person(Pers_no pers)
{
689 690
    Cache_node *node;

Per Cederqvist's avatar
Per Cederqvist committed
691 692 693 694 695
    if ( pers == 0 )
    {
	kom_errno = KOM_CONF_ZERO;
	return FAILURE;
    }
696

697 698 699
    if ( pers >= next_free_num )
    {
	log("cached_delete_person(%lu): next_free_num == %lu\n",
Per Cederqvist's avatar
Per Cederqvist committed
700
	    (unsigned long)pers, (unsigned long)next_free_num);
701 702 703 704
	kom_errno = KOM_UNDEF_PERS;
	return FAILURE;
    }

705 706 707
    node = get_pers_node (pers);

    if ( pers >= next_free_num || node == NULL || node->s.exists == 0 )
Per Cederqvist's avatar
Per Cederqvist committed
708
    {
Per Cederqvist's avatar
Per Cederqvist committed
709
	log("cached_delete_person(): attempt to delete void person.\n");
Per Cederqvist's avatar
Per Cederqvist committed
710 711 712 713
	kom_errno = KOM_UNDEF_PERS;
	return FAILURE;
    }

714
    if ( node->lock_cnt > 0 )
715
	log("cached_delete_pers(%lu): lock_cnt === %lu\n",
Per Cederqvist's avatar
Per Cederqvist committed
716
	    (unsigned long)pers, (unsigned long)node->lock_cnt);
Per Cederqvist's avatar
Per Cederqvist committed
717

718 719
    LOGACC(lt_delete_pers, pers);

720 721 722
    free_person (node->ptr);
    node->ptr = NULL;
    node->s.exists = 0;
Per Cederqvist's avatar
Per Cederqvist committed
723 724 725 726 727 728
    return OK;
}

Success
cached_delete_text(Text_no text)
{
729 730
    Cache_node *node;

Per Cederqvist's avatar
Per Cederqvist committed
731 732 733 734 735
    if ( text == 0 )
    {
	kom_errno = KOM_TEXT_ZERO;
	return FAILURE;
    }
736 737 738 739 740

    node = get_text_node (text);

    if ( text >= next_text_num || node == NULL
	|| node->s.exists == 0 )
Per Cederqvist's avatar
Per Cederqvist committed
741
    {
Per Cederqvist's avatar
Per Cederqvist committed
742
	log("cached_delete_text(): attempt to delete void text %d.\n", text);
Per Cederqvist's avatar
Per Cederqvist committed
743 744 745 746
	kom_errno = KOM_NO_SUCH_TEXT;
	return FAILURE;
    }

747
    if ( node->lock_cnt > 0 )
Per Cederqvist's avatar
Per Cederqvist committed
748
	log("cached_delete_text(%d): lock_cnt === %d\n",
749
	    text, node->lock_cnt);
Per Cederqvist's avatar
Per Cederqvist committed
750 751


752 753 754
    free_text_stat(node->ptr);
    node->ptr = NULL;
    node->s.exists = 0;
Per Cederqvist's avatar
Per Cederqvist committed
755

756 757 758
#ifdef LOGACCESSES
    if (garb_running)
    {
759
	LOGACC(lt_garb_text, text);
760 761
    }
    else
762
	LOGACC(lt_delete_text, text);
763
#endif
Per Cederqvist's avatar
Per Cederqvist committed
764 765 766 767 768
    return OK;
}


extern Conference *
769
cached_get_conf_stat (Conf_no   conf_no)
Per Cederqvist's avatar
Per Cederqvist committed
770
{
771 772
    Cache_node *node;

Per Cederqvist's avatar
Per Cederqvist committed
773 774 775 776 777 778 779
    TRACE2("cached_get_conf_stat %d\n", conf_no);

    if ( conf_no == 0 )
    {
	kom_errno = KOM_CONF_ZERO;
	return NULL;
    }
780 781 782 783

    node = get_conf_node (conf_no);

    if ( conf_no >= next_free_num || node == NULL || node->s.exists == 0 )
Per Cederqvist's avatar
Per Cederqvist committed
784 785 786 787 788
    {
	kom_errno = KOM_UNDEF_CONF;
	return NULL;
    }

789 790
    LOGACC(lt_conf_stat, conf_no);

791
    if ( node->ptr != NULL )
Per Cederqvist's avatar
Per Cederqvist committed
792
    {
793
	conf_set_mru (conf_no);
794
	++conf_mcb->hits;
795
	return node->ptr;
Per Cederqvist's avatar
Per Cederqvist committed
796 797
    }

798
    if ( node->snap_shot != NULL )
Per Cederqvist's avatar
Per Cederqvist committed
799
    {
800
	node->ptr = copy_conference (node->snap_shot);
Per Cederqvist's avatar
Per Cederqvist committed
801
	conf_set_mru (conf_no);
802
	++conf_mcb->hits;
803
	return node->ptr;
Per Cederqvist's avatar
Per Cederqvist committed
804 805
    }

806
    node->ptr = read_conference(file_a, node->pos, node->size);
807
    ++conf_mcb->misses;
Per Cederqvist's avatar
Per Cederqvist committed
808 809

    conf_set_mru (conf_no);
810
    return node->ptr;
Per Cederqvist's avatar
Per Cederqvist committed
811 812 813 814 815 816 817 818
}

/*
 * Return TRUE if conf_no exists.
 */
Bool
cached_conf_exists(Conf_no conf_no)
{
819 820 821 822 823 824 825
    Cache_node *node;

    if (conf_no == 0 || conf_no >= next_free_num )
	return FALSE;

    node = get_conf_node (conf_no);

826 827 828 829
    if (node != NULL && node->s.exists != 0)
      return TRUE;
    else
      return FALSE;
Per Cederqvist's avatar
Per Cederqvist committed
830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845
}

    
/*
 * Calls to handle texts
 */

/*
 * +++ Should return Success.
 */
extern String
cached_get_text( Text_no text )
{
    String  the_string;
    Text_stat *t_stat;

846
    TRACE2("cached_get_text %lu\n", text);
Per Cederqvist's avatar
Per Cederqvist committed
847 848 849 850 851

    if ( (t_stat = cached_get_text_stat (text)) == NULL )
	return EMPTY_STRING;
    else
    {
852
	LOGACC(lt_text_mass, text);
Per Cederqvist's avatar
Per Cederqvist committed
853 854 855 856 857 858 859
	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)
	    != the_string.len )
	{
Per Cederqvist's avatar
Per Cederqvist committed
860
	    log("WARNING: cached_get_text: premature end on text %d\n",
Per Cederqvist's avatar
Per Cederqvist committed
861 862 863 864 865 866 867 868 869 870 871 872
		text);
	    return EMPTY_STRING;
	}
		    
	return the_string;
    }
}


extern Text_stat *	/* NULL on error */
cached_get_text_stat(	Text_no		text )
{
873 874
    Cache_node *node;

875
    TRACE2("cached_get_text_stat(%lu);  next_text_num == ", text);
Per Cederqvist's avatar
Per Cederqvist committed
876 877 878 879 880 881 882
    TRACE2("%d\n", next_text_num);

    if ( text == 0 )
    {
	kom_errno = KOM_TEXT_ZERO;
	return NULL;
    }
883 884 885 886

    node = get_text_node (text);

    if ( text >= next_text_num || node == NULL || node->s.exists == 0 )
Per Cederqvist's avatar
Per Cederqvist committed
887 888 889 890 891 892
    {
	TRACE1("cached_get_text_stat: no such text.\n");
	kom_errno = KOM_NO_SUCH_TEXT;
	return NULL;
    }

893 894
    LOGACC(lt_text_stat, text);

895
    if ( node->ptr != NULL )
Per Cederqvist's avatar
Per Cederqvist committed
896 897 898
    {
	TRACE1("Found in ptr.\n");
	text_set_mru( text );
899
	++text_mcb->hits;
900
	return node->ptr;
Per Cederqvist's avatar
Per Cederqvist committed
901 902
    }

903
    if ( node->snap_shot != NULL )
Per Cederqvist's avatar
Per Cederqvist committed
904 905
    {
	TRACE1("Found in snap_shot\n");
906
	node->ptr = copy_text_stat(node->snap_shot);
Per Cederqvist's avatar
Per Cederqvist committed
907
	text_set_mru (text);
908
	++text_mcb->hits;
909
	return node->ptr;
Per Cederqvist's avatar
Per Cederqvist committed
910 911 912
    }

    TRACE1("Found in file A.\n");
913
    node->ptr = read_text_stat(file_a, node->pos, node->size);
Per Cederqvist's avatar
Per Cederqvist committed
914 915

    text_set_mru (text);
916
    ++text_mcb->misses;
917
    return node->ptr;
Per Cederqvist's avatar
Per Cederqvist committed
918 919 920 921 922 923
}



/*
 * The text is set up with an empty misc-field. The misc field is
924
 * then initialized by create_text.
Per Cederqvist's avatar
Per Cederqvist committed
925 926 927
 */

extern Text_no
928
cached_create_text(const String message)
Per Cederqvist's avatar
Per Cederqvist committed
929 930
{
    Text_no tno;
931
    Cache_node *node;
932
    long file_pos;
Per Cederqvist's avatar
Per Cederqvist committed
933 934 935

    tno = next_text_num++;

936
    TRACE2("cached_create_text (len=%lu)\n", message.len);
Per Cederqvist's avatar
Per Cederqvist committed
937 938 939 940 941 942 943 944 945

    if ( tno >= MAX_TEXT )
    {
	kom_errno = KOM_INDEX_OUT_OF_RANGE;
	next_text_num = MAX_TEXT;
	
	return 0;
    }

946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984
    if (fseek(text_file, 0, SEEK_END) != 0) 
    {
	log("ERROR: cannot seek to end of text_file: %s\n", strerror(errno));
	clearerr(text_file);
	return 0;
    }

    file_pos = ftell(text_file);

    if (fwrite(message.string, 1, message.len, text_file) != message.len)
    {
	if (errno != ENOSPC)
	    log("WARNING: cached_create_text: Couldn't write text %d: %s\n",
		tno, strerror(errno));
	kom_errno = KOM_TEMPFAIL;
	clearerr(text_file);
	return 0;
    }

    if (fflush(text_file) != 0)
    {
	if (errno != ENOSPC)
	    log("WARNING: cached_create_text: Couldn't fflush text %d: %s\n",
		tno, strerror(errno));
	kom_errno = KOM_TEMPFAIL;
	clearerr(text_file);
	return 0;
    }

    if (fsync(fileno(text_file)) != 0)
    {
	if (errno != ENOSPC)
	    log("WARNING: cached_create_text: Couldn't fsync text %d: %s\n",
		tno, strerror(errno));
	kom_errno = KOM_TEMPFAIL;
	clearerr(text_file);
	return 0;
    }

985 986
    create_cache_node(text_mcb, tno);
    node = get_text_node (tno);
Per Cederqvist's avatar
Per Cederqvist committed
987

988
    if ( node == NULL )
Per Cederqvist's avatar
Per Cederqvist committed
989
	restart_kom("cached_create_text(): couldn't create cache-node.\n");
990 991 992 993 994 995 996 997 998
    
    node->s.exists = 1;
    node->s.dirty = 1;
    node->ptr = alloc_text_stat();
    ((Text_stat *)node->ptr)->no_of_misc = 0;
    ((Text_stat *)node->ptr)->misc_items = NULL;
    ((Text_stat *)node->ptr)->no_of_marks = 0;
    ((Text_stat *)node->ptr)->no_of_lines = 0;
    ((Text_stat *)node->ptr)->no_of_chars = 0;
999
    ((Text_stat *)node->ptr)->file_pos = file_pos;
Per Cederqvist's avatar
Per Cederqvist committed
1000 1001 1002 1003

    text_set_mru( tno );


1004
    LOGACC(lt_create_text, tno);
1005
    TRACE2("cached_create_text -> %lu\n", tno);
Per Cederqvist's avatar
Per Cederqvist committed
1006 1007 1008 1009 1010
    
    return tno;
}


1011
EXPORT Text_no
Per Cederqvist's avatar
Per Cederqvist committed
1012 1013
traverse_text(Text_no seed)
{
1014 1015
    Cache_node *node;

Per Cederqvist's avatar
Per Cederqvist committed
1016 1017
    seed++;
    
1018
    while ( seed < next_text_num )
Per Cederqvist's avatar
Per Cederqvist committed
1019
    {
1020 1021 1022 1023
	node = get_text_node (seed);
	if ( node != NULL && node->s.exists != 0 )
	    break;

Per Cederqvist's avatar
Per Cederqvist committed
1024 1025 1026 1027 1028 1029 1030 1031 1032
	seed++;
    }
    
    return (seed >= next_text_num) ? 0 : seed ;
}

Pers_no
traverse_person(Pers_no seed)
{
1033 1034
    Cache_node *node;

Per Cederqvist's avatar
Per Cederqvist committed
1035 1036
    seed++;

1037
    while ( seed < next_free_num )
Per Cederqvist's avatar
Per Cederqvist committed
1038
    {
1039 1040 1041 1042
	node = get_pers_node (seed);
	if (node != NULL && node->s.exists != 0 )
	    break;

Per Cederqvist's avatar
Per Cederqvist committed
1043 1044 1045 1046 1047 1048 1049 1050 1051
	seed++;
    }

    return (seed >= next_free_num) ? 0 : seed ;
}

Conf_no
traverse_conference(Conf_no seed)
{
1052 1053
    Cache_node *node;

Per Cederqvist's avatar
Per Cederqvist committed
1054 1055
    seed++;
    
1056
    while ( seed < next_free_num )
Per Cederqvist's avatar
Per Cederqvist committed
1057
    {
1058 1059 1060 1061
	node = get_conf_node (seed);
	if (node != NULL && node->s.exists != 0 )
	    break;

Per Cederqvist's avatar
Per Cederqvist committed
1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073
	seed++;
    }

    return (seed >= next_free_num) ? 0 : seed ;
}

extern Garb_nice
cached_get_garb_nice (Conf_no conf_no)
{
    return small_conf_arr [ conf_no ]->nice;
}

1074 1075 1076 1077 1078
extern String
cached_get_name (Conf_no conf_no)
{
    return small_conf_arr [ conf_no ]->name;
}
Per Cederqvist's avatar
Per Cederqvist committed
1079 1080 1081 1082

extern Local_text_no
cached_get_highest_local_no (Conf_no conf_no)
{
1083 1084
    LOGACC(lt_get_highest, conf_no);

Per Cederqvist's avatar
Per Cederqvist committed
1085 1086 1087
    return small_conf_arr[ conf_no ]->highest_local_no;
}

1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107
extern Small_conf *
cached_get_small_conf_stat (Conf_no conf_no)
{
    TRACE2("cached_get_small_conf_stat %d\n", conf_no);

    if (conf_no == 0)
    {
	kom_errno = KOM_CONF_ZERO;
	return NULL;
    }
    
    if (conf_no >= next_free_num ||
	small_conf_arr[conf_no] == NULL)
    {
	kom_errno = KOM_UNDEF_CONF;
	return NULL;
    }
    return small_conf_arr[conf_no];
}

Per Cederqvist's avatar
Per Cederqvist committed
1108 1109 1110 1111
/* Lock a person struct in memory. Increase a referenc count. */
void
cached_lock_person(Pers_no pers_no)
{
1112 1113
    Cache_node *node;

1114 1115
    LOGACC(lt_lock_pers, pers_no);

1116 1117 1118
    node = get_pers_node(pers_no);
    
    if ( node == NULL || node->s.exists == 0 )
Per Cederqvist's avatar
Per Cederqvist committed
1119 1120
	restart_kom("cached_lock_person(%d): nonexistent.\n", pers_no);

1121
    if ( node->ptr == NULL )
Per Cederqvist's avatar
Per Cederqvist committed
1122
    {
1123
	Person *pers_stat_ptr;
Per Cederqvist's avatar
Per Cederqvist committed
1124

1125
	pers_stat_ptr = cached_get_person_stat( pers_no );
Per Cederqvist's avatar
Per Cederqvist committed