/*-
 * 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.
 *
 */

#include <sys/param.h>
#include <sys/stat.h>

#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "stress.h"

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

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

        umask(0);
        path[0] = 0;
        if (nb == 0) {
                getdf(&bl, &in);
                size = in / op->incarnations;

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

                if (size > 32000 && op->hog == 0)
                        size = 32000;   /* arbitrary limit number of files pr. dir */

                /* Resource requirements: */
                reserve_in =  2 * op->incarnations + 7;
                reserve_bl = 26 * size * op->incarnations;
                if (reserve_in > in || reserve_bl > bl)
                        size = reserve_in = reserve_bl = 0;

                if (op->verbose > 1)
                        printf("link(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);
        } else {
                size = getval();
        }
        if (size == 0)
                exit (1);

        sprintf(path,"%s.%05d", getprogname(), getpid());
        if (mkdir(path, 0770) < 0)
                err(1, "mkdir(%s), %s:%d", path, __FILE__, __LINE__);

        if (chdir(path) == -1)
                err(1, "chdir(%s), %s:%d", path, __FILE__, __LINE__);

        return (0);
}

void
cleanup(void)
{
        if (size == 0)
                return;
        (void)chdir("..");
        if (path[0] != 0 && rmdir(path) == -1)
                warn("rmdir(%s), %s:%d", path, __FILE__, __LINE__);
}

int
test(void)
{
        pid_t pid;
        int fd, i, j;
        char file[128];
        char lfile[128];

        pid = getpid();
        for (j = 0; j < (int)size && done_testing == 0; j++) {
                sprintf(file,"p%05d.%05d", pid, j);
                if (j == 0) {
                        if ((fd = creat(file, 0660)) == -1) {
                                if (errno != EINTR) {
                                        warn("creat(%s)", file);
                                        break;
                                }
                        }
                        if (fd != -1 && close(fd) == -1)
                                err(2, "close(%d)", j);
                        strcpy(lfile, file);
                } else {
                        if (link(lfile, file) == -1) {
                                if (errno != EINTR) {
                                        warn("link(%s, %s)", lfile, file);
                                        break;
                                }
                        }
                }

        }

        for (i = --j; i >= 0; i--) {
                sprintf(file,"p%05d.%05d", pid, i);
                if (unlink(file) == -1)
                        err(3, "unlink(%s)", file);

        }

        return (0);
}