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

#include "stress.h"

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

int
setup(int nb)
{
        char file1[512];
        int64_t in;
        int64_t bl;
        int64_t reserve_in;
        int64_t reserve_bl;
        int i;

        umask(0);

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

                if (size > 1000)
                        size = 1000;    /* arbitrary limit number of files pr. dir */

                /* Resource requirements: */
                while (size > 0) {
                        reserve_in =  2 * size * op->incarnations + 2 * op->incarnations;
                        reserve_bl = 30 * size * op->incarnations;
                        if (reserve_bl <= bl && reserve_in <= in)
                                break;
                        size = size / 2;
                }
                if (size == 0)
                        reserve_bl = reserve_in = 0;

                if (op->verbose > 1)
                        printf("rename(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(0);

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

        /*
         * The value 97 was determined by figuring out how many 255 length
         * names would cause us to overflow into indirect blocks w/ the
         * default UFS parameters.
         */
        for (i = 0; i < 97; i++) {
                sprintf(file1, "%s/%0255d", path, i);
                if (mkdir(file1, 0770) == -1)
                        err(1, "mkdir(%s), %s:%d", file1, __FILE__, __LINE__);
        }
        return (0);
}

void
cleanup(void)
{
        char file1[512];
        int i;

        /* see comment above */
        for (i = 0; i < 97; i++) {
                sprintf(file1, "%s/%0255d", path, i);
                if (rmdir(file1) == -1)
                        warn("rmdir(%s), %s:%d", file1, __FILE__, __LINE__);
        }
        if (rmdir(path) == -1)
                warn("rmdir(%s), %s:%d", path, __FILE__, __LINE__);
}

static void
test_rename(void)
{
        int i, j;
        int errnotmp;
        pid_t pid;
        char file1[128];
        char file2[128];

        pid = getpid();
        for (i = 0; i < (int)size; i++) {
                sprintf(file1,"p%05d.%05d", pid, i);
                if (mkdir(file1, 0660) == -1) {
                        j = i;
                        errnotmp = errno;
                        while (j > 0) {
                                j--;
                                sprintf(file1,"p%05d.%05d", pid, j);
                                rmdir(file1);
                        }
                        errno = errnotmp;
                        sprintf(file1,"p%05d.%05d", pid, i);
                        err(1, "mkdir(%s), %s:%d", file1, __FILE__, __LINE__);
                }
        }
        for (j = 0; j < 100 && done_testing == 0; j++) {
                for (i = 0; i < (int)size; i++) {
                        sprintf(file1,"p%05d.%05d", pid, i);
                        sprintf(file2,"%s/p%05d.%05d.togo", path, pid, i);
                        if (rename(file1, file2) == -1)
                                err(1, "rename(%s, %s). %s:%d", file1, file2,
                                                __FILE__, __LINE__);
                }
                for (i = 0; i < (int)size; i++) {
                        sprintf(file1,"p%05d.%05d", pid, i);
                        sprintf(file2,"%s/p%05d.%05d.togo", path, pid, i);
                        if (rename(file2, file1) == -1)
                                err(1, "rename(%s, %s). %s:%d", file2, file1,
                                                __FILE__, __LINE__);
                }
        }

        for (i = 0; i < (int)size; i++) {
                sprintf(file1,"p%05d.%05d", pid, i);
                if (rmdir(file1) == -1)
                        err(1, "rmdir(%s), %s:%d", file1, __FILE__, __LINE__);
        }
}

int
test(void)
{
        test_rename();

        return (0);
}