/* $NetBSD: fssconfig.c,v 1.13 2017/12/21 15:52:19 hannken Exp $ */

/* $NetBSD: fssconfig.c,v 1.13 2017/12/21 15:52:19 hannken Exp $ */

/*-
* Copyright (c) 2003 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Juergen Hannken-Illjes.
*
* 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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/ioctl.h>
#include <sys/mount.h>
#include <sys/stat.h>

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

#include <dev/fssvar.h>

#include "prog_ops.h"

static int vflag = 0;
static int xflag = 0;

static void config(int, char **);
static void unconfig(int, char **);
static void list(int, char **);
__dead static void usage(void);

int
main(int argc, char **argv)
{
int ch;
void (*action)(int, char **);

action = NULL;

while ((ch = getopt(argc, argv, "cluvx")) != -1) {
switch (ch) {
case 'c':
if (action)
usage();
else
action = config;
break;
case 'l':
if (action)
usage();
else
action = list;
break;
case 'u':
if (action)
usage();
else
action = unconfig;
break;
case 'v':
vflag++;
break;
case 'x':
xflag++;
break;
default:
case '?':
usage();
/* NOTREACHED */
}
}
if (action == NULL)
action = config;

argc -= optind;
argv += optind;

(*action)(argc, argv);

exit(0);
}

static void
config(int argc, char **argv)
{
int fd, isreg, istmp, ispersistent;
char full[64], path[MAXPATHLEN];
off_t bssize;
dev_t mountdev;
struct stat sbuf;
struct statvfs fsbuf;
struct fss_set fss;

if (argc < 3)
usage();

istmp = ispersistent = 0;

fss.fss_mount = argv[1];
fss.fss_bstore = argv[2];

if (prog_statvfs1(argv[1], &fsbuf, ST_WAIT) != 0 ||
prog_stat(argv[1], &sbuf) != 0)
err(1, "stat %s", argv[1]);
mountdev = sbuf.st_dev;
if (stat(argv[2], &sbuf) == 0) {
if (S_ISREG(sbuf.st_mode) && sbuf.st_dev == mountdev) {
if ((sbuf.st_flags & SF_SNAPSHOT) == 0)
errx(1, "%s: exists and is not a snapshot",
argv[2]);
if (argc != 3)
usage();
isreg = ispersistent = 1;

goto configure;
} else if (S_ISDIR(sbuf.st_mode)) {
istmp = 1;
}
}

if (argc > 5)
usage();

if (argc > 3)
fss.fss_csize = strsuftoll("cluster size", argv[3], 0, INT_MAX);
else
fss.fss_csize = 0;
if (argc > 4)
bssize = strsuftoll("bs size", argv[4], 0, LLONG_MAX);
else
bssize = (off_t)fsbuf.f_blocks*fsbuf.f_frsize;

/*
* Create the backing store.
*/
if (istmp) {
snprintf(path, sizeof(path), "%s/XXXXXXXXXX", argv[2]);
fss.fss_bstore = path;
fd = mkstemp(fss.fss_bstore);
} else {
fd = prog_open(fss.fss_bstore, O_CREAT|O_TRUNC|O_WRONLY, 0600);
}
if (fd < 0) {
err(1, "create: %s", fss.fss_bstore);
}
if (prog_fstat(fd, &sbuf) < 0)
err(1, "stat: %s", fss.fss_bstore);
if (!ispersistent && sbuf.st_dev == mountdev)
ispersistent = 1;
isreg = S_ISREG(sbuf.st_mode);
if (!ispersistent && isreg && ftruncate(fd, bssize) < 0)
err(1, "truncate %s", fss.fss_bstore);
prog_close(fd);

configure:
fd = opendisk1(argv[0], O_RDWR, full, sizeof(full), 0, prog_open);
if (fd < 0) {
if (istmp)
unlink(fss.fss_bstore);
err(1, "open: %s", argv[0]);
}

fss.fss_flags = 0;
if ((xflag || istmp) && isreg)
fss.fss_flags |= FSS_UNLINK_ON_CREATE;

if (prog_ioctl(fd, FSSIOCSET, &fss) < 0) {
if (istmp)
unlink(fss.fss_bstore);
err(1, "%s: FSSIOCSET", full);
}

if (vflag)
list(1, argv);
}

static void
unconfig(int argc, char **argv)
{
int fd;
char full[64];

if (argc != 1 || xflag)
usage();

if (vflag)
list(1, argv);

fd = opendisk1(argv[0], O_RDWR, full, sizeof(full), 0, prog_open);
if (fd < 0)
err(1, "open: %s", argv[0]);

if (prog_ioctl(fd, FSSIOCCLR) < 0)
err(1, "%s: FSSIOCCLR", full);
}

static void
list(int argc, char **argv)
{
int n, fd, flags;
char *dev, path[64], full[64];
char clbuf[5], bsbuf[5], tmbuf[64];
time_t t;
struct fss_get fsg;

if (argc > 1 || xflag)
usage();

if (argc > 0)
dev = argv[0];
else
dev = path;

for (n = 0; ; n++) {
if (argc == 0)
snprintf(path, sizeof(path), "fss%d", n);
fd = opendisk1(dev, O_RDONLY, full, sizeof(full), 0, prog_open);
if (fd < 0) {
if (argc == 0 && (errno == ENOENT || errno == ENXIO))
break;
err(1, "open: %s", dev);
}

if (prog_ioctl(fd, FSSIOFGET, &flags) < 0)
flags = 0;

if (prog_ioctl(fd, FSSIOCGET, &fsg) < 0) {
if (errno == ENXIO)
printf("%s: not in use\n", dev);
else
err(1, "%s: FSSIOCGET", full);
} else if (vflag) {
humanize_number(clbuf, sizeof(clbuf),
(int64_t)fsg.fsg_csize,
"", HN_AUTOSCALE, HN_B|HN_NOSPACE);

humanize_number(bsbuf, sizeof(bsbuf),
(int64_t)fsg.fsg_bs_size*fsg.fsg_csize,
"", HN_AUTOSCALE, HN_B|HN_NOSPACE);

t = fsg.fsg_time.tv_sec;
strftime(tmbuf, sizeof(tmbuf), "%F %T", localtime(&t));

printf("%s: %s, taken %s", dev, fsg.fsg_mount, tmbuf);
if ((flags & FSS_UNCONFIG_ON_CLOSE) != 0)
printf(", unconfig on close");
if (fsg.fsg_csize == 0)
printf(", file system internal\n");
else
printf(", %"PRId64" cluster of %s, %s backup\n",
fsg.fsg_mount_size, clbuf, bsbuf);
} else
printf("%s: %s\n", dev, fsg.fsg_mount);

prog_close(fd);

if (argc > 0)
break;
}
}

static void
usage(void)
{
fprintf(stderr, "%s",
"usage: fssconfig [-cxv] device path backup [cluster [size]]\n"
" fssconfig -u [-v] device\n"
" fssconfig -l [-v] [device]\n");
exit(1);
}