/*-
 * Copyright (c) 2008 Peter Holm <pho@FreeBSD.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 */

/* Write and check read a file */

#include <sys/param.h>
#include <sys/stat.h>
#include <err.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#include "stress.h"

static char path[128];
static int starting_dir;
static unsigned long size;

#define MAXSIZE 256 * 1024

int
setup(int nb)
{
        int64_t bl;
        int64_t in;
        int64_t reserve_in;
        int64_t reserve_bl;
        int pct;

        if (nb == 0) {
                getdf(&bl, &in);
                size = bl / op->incarnations / 1024;

                pct = 90;
                if (op->hog == 0)
                        pct = random_int(1, 90);
                size = size / 100 * pct + 1;

                if (size > MAXSIZE)
                        size = MAXSIZE; /* arbitrary limit size pr. incarnation */

                /* Resource requirements: */
                while (size > 0) {
                        reserve_in =  2 * op->incarnations + 1;
                        reserve_bl = size * 1024 * op->incarnations +
                                (512 * 1024 * op->incarnations) +
                                  64 * 1024;
                        if (reserve_bl <= bl && reserve_in <= in)
                                break;
                        size = size / 10 * 8;
                }
                if (size == 0)
                        reserve_bl = reserve_in = 0;

                if (op->verbose > 1)
                        printf("rw(size=%lu, incarnations=%d). Free(%jdk, %jd), reserve(%jdk, %jd)\n",
                                size, op->incarnations, bl/1024, in, reserve_bl/1024, reserve_in);
                reservedf(reserve_bl, reserve_in);
                putval(size);
                size = size * 1024;
        } else {
                size = getval();
                size = size * 1024;
        }
        if (size == 0)
                exit(0);

        umask(0);
        sprintf(path,"%s.%05d", getprogname(), getpid());
        (void)mkdir(path, 0770);
        if (chdir(path) == -1)
                err(1, "chdir(%s), %s:%d", path, __FILE__, __LINE__);
        if ((starting_dir = open(".", 0)) < 0)
                err(1, ".");

        return (0);
}

void
cleanup(void)
{
        if (starting_dir == 0)
                return;
        if (fchdir(starting_dir) == -1)
                err(1, "fchdir()");
        if (close(starting_dir) < 0)
                err(1, "close(starting_dir:%d)", starting_dir);

        (void)system("find . -delete");

        if (chdir("..") == -1)
                err(1, "chdir(..)");
        if (rmdir(path) == -1)
                err(1, "rmdir(%s), %s:%d", path, __FILE__, __LINE__);
        size = 0;
}

int
test(void)
{
        int buf[1024], index, to;
#ifdef TEST
        int i;
#endif
        int fd;
        char file[128];

        sprintf(file,"p%05d", getpid());
        if ((fd = creat(file, 0660)) == -1)
                err(1, "creat(%s)", file);

        to = sizeof(buf);
        index = 0;
        while (index < (int)size) {
                if (index + to > (int)size)
                        to = size - index;
#ifdef TEST
                for (i = 0; i < to; i++)
                        buf[i] = index + i;
#endif
                index += to;
                if (write(fd, buf, to) != to)
                        err(1, "write(%s), %s:%d", file, __FILE__, __LINE__);
        }
        if (close(fd) == -1)
                err(1, "close(%s), %s:%d", file, __FILE__, __LINE__);

        if ((fd = open(file, O_RDONLY)) == -1)
                err(1, "open(%s), %s:%d", file, __FILE__, __LINE__);

        index = 0;
        while (index < (int)size && done_testing == 0) {
                if (index + to > (int)size)
                        to = size - index;
                if (read(fd, buf, to) != to)
                        err(1, "rw read. %s.%d", __FILE__, __LINE__);
#ifdef TEST
                for (i = 0; i < to; i++) {
                        if (buf[i] != index + i) {
                                fprintf(stderr,
                                        "%s, pid %d: expected %d @ %d, got %d\n",
                                        getprogname(), getpid(), index+i, index+i,
                                        buf[i]);
                                exit(EXIT_FAILURE);
                        }
                }
#endif
                index += to;
        }
        if (close(fd) == -1)
                err(1, "close(%s), %s:%d", file, __FILE__, __LINE__);
        if (unlink(file) == -1)
                err(1, "unlink(%s), %s:%d", file, __FILE__, __LINE__);
        return (0);
}