/*-
 * 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.
 *
 */

/* Get various resource limits for the tests */

#include <sys/types.h>
#include <sys/sysctl.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/statvfs.h>
#include <sys/param.h>
#include <sys/mount.h>
#include <kvm.h>
#include <vm/vm_param.h>
#include <errno.h>
#include <err.h>
#include <stdarg.h>
#include <libutil.h>

#include "stress.h"

static int lockfd;
static int dffd;
static int flags;
static char lockpath[128];
static char dfpath[128];

static int64_t
inodes(void)
{
        char path[MAXPATHLEN+1];
        struct statfs sbuf;
        struct statvfs buf;

        if (op->inodes != 0)
                return (op->inodes);
        if (getcwd(path, sizeof(path)) == NULL)
                err(1, "getcwd()");

        if (statfs(path, &sbuf) < 0)
                err(1, "statfs(%s)", path);
        if (statvfs(path, &buf) < 0)
                err(1, "statvfs(%s)", path);
        if (!strcmp(sbuf.f_fstypename, "msdosfs"))
                buf.f_ffree = 9999;
        flags = sbuf.f_flags & MNT_VISFLAGMASK;
        if (op->verbose > 2)
                printf("Free inodes on %s (%s): %jd\n", path, sbuf.f_mntonname,
                    (intmax_t)buf.f_ffree);
        return (buf.f_ffree);
}

static int64_t
df(void)
{
        char path[MAXPATHLEN+1];
        struct statvfs buf;

        if (op->kblocks != 0)
                return (op->kblocks * (uint64_t)1024);

        if (getcwd(path, sizeof(path)) == NULL)
                err(1, "getcwd()");

        if (statvfs(path, &buf) < 0)
                err(1, "statfs(%s)", path);

        if (buf.f_bavail > buf.f_blocks || buf.f_bavail < 0) {
                warnx("Corrupt statfs(%s). f_bavail = %jd!", path,
                    (intmax_t)buf.f_bavail);
                buf.f_bavail = 100;
        }
        if (op->verbose > 2)
                printf("Free space on %s: %jd Mb\n", path,
                    (intmax_t)(buf.f_bavail * buf.f_bsize / 1024 / 1024));
        return (buf.f_bavail * buf.f_bsize);
}


int64_t
swap(void)
{
#error "please put the amount of free swap (in bytes) in sz" /* REMOVE HERE! */
        /*
         * Currently, DragonFly has no way of determining free swap as non-root
         *
         * Please remove the #error line above this comment and modify the
         * line below it with the amount of free swap you have (in bytes).
         */
        int64_t sz = 4294967296LL; /* EDIT HERE! */

        if (op->verbose > 2)
                printf("Total free swap space %jd Mb\n",
                    (intmax_t)(sz / 1024 / 1024));

        return (sz);
}

unsigned long
usermem(void)
{
        unsigned long mem;
        size_t nlen = sizeof(mem);

        if (sysctlbyname("hw.usermem", &mem, &nlen, NULL, 0) == -1)
                err(1, "sysctlbyname() %s:%d", __FILE__, __LINE__);

        if (op->verbose > 2)
                printf("Total free user memory %lu Mb\n",
                        mem / 1024 / 1024);

        return (mem);
}

void cleanupdf()
{
        unlink(dfpath);
}

void
getdf(int64_t *block, int64_t *inode)
{
        int i, j;
        char buf[128];

        snprintf(lockpath, sizeof(lockpath), "%s/lock", op->cd);
        for (j = 0; j < 10; j++) {
                for (i = 0; i < 10000; i++) {
                        if ((lockfd = open(lockpath,
                                        O_CREAT | O_TRUNC | O_WRONLY | O_EXCL, 0644)) != -1)
                                break;
                        usleep(10000); /* sleep 1/100 sec */
                }
                if (lockfd != -1)
                        break;
                fprintf(stderr, "%s. Removing stale %s\n", getprogname(), lockpath);
                unlink(lockpath);
        }
        if (lockfd == -1)
                        errx(1, "%s. Can not create %s\n", getprogname(), lockpath);
        snprintf(dfpath, sizeof(dfpath), "%s/df", op->cd);
        if ((dffd = open(dfpath, O_RDWR, 0644)) == -1) {
                if ((dffd = open(dfpath,
                                O_CREAT | O_TRUNC | O_WRONLY, 0644)) == -1) {
                        unlink(lockpath);
                        err(1, "creat(%s) %s:%d", dfpath, __FILE__, __LINE__);
                }
                atexit(cleanupdf);
                *block = df();
                *inode = inodes();
                snprintf(buf, sizeof(buf), "%jd %jd", *block, *inode);

                if (write(dffd, buf, strlen(buf) + 1) != strlen(buf) +1)
                        err(1, "write df. %s:%d", __FILE__, __LINE__);
        } else {
                if (read(dffd, buf, sizeof(buf)) < 1) {
                        system("ls -l /tmp/stressX.control");
                        unlink(lockpath);
                        err(1, "read df. %s:%d", __FILE__, __LINE__);
                }
                sscanf(buf, "%jd %jd", block, inode);
        }
        close(dffd);
}


void
reservedf(int64_t blks, int64_t inos)
{
        char buf[128];
        int64_t blocks, inodes;

        if ((dffd = open(dfpath, O_RDWR, 0644)) == -1) {
                warn("open(%s) %s:%d. %s", dfpath, __FILE__, __LINE__, getprogname());
                goto err;
        }
        if (read(dffd, buf, sizeof(buf)) < 1) {
                warn("read df. %s:%d", __FILE__, __LINE__);
                goto err;
        }
        sscanf(buf, "%jd %jd", &blocks, &inodes);

        if (op->verbose > 2)
                printf("%-8s: reservefd(%9jdK, %6jd) out of (%9jdK, %6jd)\n",
                                getprogname(), blks/1024, inos, blocks/1024, inodes);
        blocks -= blks;
        inodes -= inos;

        snprintf(buf, sizeof(buf), "%jd %jd", blocks, inodes);
        if (blocks < 0 || inodes < 0)
                printf("******************************** %s: %s\n", getprogname(), buf);
        if (lseek(dffd, 0, 0) == -1)
                err(1, "lseek. %s:%d", __FILE__, __LINE__);
        if (write(dffd, buf, strlen(buf) + 1) != strlen(buf) +1)
                warn("write df. %s:%d", __FILE__, __LINE__);
err:
        close(dffd);
        close(lockfd);
        if (unlink(lockpath) == -1)
                err(1, "unlink(%s)", lockpath);
}

/* The UFS2 soft update lag problem causes a lot of confusion, so for now add the err() function here */

static void
vpr(int code, const char *fmt, va_list ap)
{
        char path[MAXPATHLEN+1];
        char siz[5], ino[5];
        int64_t s, i;

        s = df();
        i = inodes();

        if (errno == ENOSPC && (flags & MNT_SOFTDEP) && (flags & MNT_QUOTA) == 0 &&
                        s > 100 && i > 100) {
                if (getcwd(path, sizeof(path)) == NULL)
                        err(1, "getcwd()");

                humanize_number(siz, sizeof(siz), s, "",
                        HN_AUTOSCALE, HN_B | HN_NOSPACE | HN_DECIMAL);
                humanize_number(ino, sizeof(ino), i, "",
                        HN_AUTOSCALE, HN_B | HN_NOSPACE | HN_DECIMAL);

                printf("A syscall has failed with ENOSPC even though free disk "
                        "space for %s is reported as %s and %s inodes.\n",
                        path, siz, ino);
        }


        fprintf(stderr, "%s: ", getprogname());
        if (fmt != NULL) {
                vfprintf(stderr, fmt, ap);
                fprintf(stderr, ": ");
        }
        fprintf(stderr, "%s\n", strerror(code));
}

void
err(int eval, const char *fmt, ...)
{
        va_list ap;
        int code = errno;

        va_start(ap, fmt);
        vpr(code, fmt, ap);
        va_end(ap);
        exit(eval);
}

void
warn(const char *fmt, ...)
{
        va_list ap;
        int code = errno;

        va_start(ap, fmt);
        vpr(code, fmt, ap);
        va_end(ap);
}