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/*
* Copyright (c) 1996 The University of Utah and
* the Computer Systems Laboratory at the University of Utah (CSL).
*
* This file is part of Flick, the Flexible IDL Compiler Kit.
*
* Flick 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 2 of the License, or
* (at your option) any later version.
*
* Flick 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 Flick; see the file COPYING. If not, write to
* the Free Software Foundation, 59 Temple Place #330, Boston, MA 02111, USA.
*/
/*
* 'hardware' part of libyfs.o
*/
#include <fcntl.h>
#include <errno.h>
#include <sys/file.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include "disk.h"
#include "file.h"
unsigned YfsError;
static fd;
static init = 1;
#define DEFAULT_PROT 0666
#ifdef hpux
#define CREAT_PROT S_ENFMT | DEFAULT_PROT
#else
#define CREAT_PROT DEFAULT_PROT
#endif
#ifdef CacheMonitor
static int singleReads=0;
static int singleWrites=0;
static int multiReads=0;
static int multiWrites=0;
static short blocks_read[NUM_OF_BLOCKS];
static short blocks_written[NUM_OF_BLOCKS];
#endif
Initialize()
{
init = 0;
fd = open(DISK_FILE_NAME, O_RDWR | O_CREAT, CREAT_PROT);
if(fd == -1)
exit(-1);
#if defined(hpux) || defined(__svr4__)
lockf(fd, F_LOCK, 0);
#else
flock(fd, LOCK_EX);
#endif
}
DoDisk(int blknum, caddr_t addr, int blks, int op)
{
if(init)
Initialize();
if(blknum < 0 || blknum >= NUM_OF_BLOCKS)
return EINVAL;
else if(blknum + blks < 0 || blknum + blks > NUM_OF_BLOCKS)
return EINVAL;
else if(blks == 0 || blks > MAX_BLOCKS_PER_OP)
return EINVAL;
else if(lseek(fd, blknum * BLOCK_SIZE, 0) == -1)
return ESPIPE;
else if(op && write(fd, addr, blks * BLOCK_SIZE) == -1)
return EIO;
else if(!op && read(fd, addr, blks * BLOCK_SIZE) == -1)
return EIO;
#ifdef CacheMonitor
if (op && blks>1) multiWrites+=blks;
if (op && blks==1) singleWrites++;
if (!op && blks>1) multiReads+=blks;
if (!op && blks==1) singleReads++;
if (op)
for(;blks;)
blocks_written[blknum + --blks]++;
if (!op)
for(;blks;)
blocks_read[blknum + --blks]++;
#endif
return 0;
}
ReadDisk(int blknum, caddr_t addr, int blks)
{
int err = DoDisk(blknum, addr, blks, 0);
if(err)
errno = err;
return err? -1: 0;
}
WriteDisk(int blknum, caddr_t addr, int blks)
{
int err = DoDisk(blknum, addr, blks, 1);
if(err)
errno = err;
return err? -1: 0;
}
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