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/*
* fsfreeze.c -- Filesystem freeze/unfreeze IO for Linux
*
* Copyright (C) 2010 Hajime Taira <htaira@redhat.com>
* Masatake Yamato <yamato@redhat.com>
*
* This program is free software. You can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation: either version 1 or
* (at your option) any later version.
*/
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <fcntl.h>
#include <linux/fs.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <getopt.h>
#include "blkdev.h"
#include "nls.h"
#include "closestream.h"
#include "c.h"
static int freeze_f(int fd)
{
return ioctl(fd, FIFREEZE, 0);
}
static int unfreeze_f(int fd)
{
return ioctl(fd, FITHAW, 0);
}
static void __attribute__((__noreturn__)) usage(FILE *out)
{
fputs(_("\nUsage:\n"), out);
fprintf(out,
_(" %s [options] <mount point>\n"), program_invocation_short_name);
fputs(_("\nOptions:\n"), out);
fputs(_(" -h, --help this help\n"
" -f, --freeze freeze the filesystem\n"
" -u, --unfreeze unfreeze the filesystem\n"), out);
fputs(_("\nFor more information see fsfreeze(8).\n"), out);
exit(out == stderr ? EXIT_FAILURE : EXIT_SUCCESS);
}
int main(int argc, char **argv)
{
int fd = -1, c;
int freeze = -1, rc = EXIT_FAILURE;
char *path;
struct stat sb;
static const struct option longopts[] = {
{ "help", 0, 0, 'h' },
{ "freeze", 0, 0, 'f' },
{ "unfreeze", 0, 0, 'u' },
{ NULL, 0, 0, 0 }
};
setlocale(LC_ALL, "");
bindtextdomain(PACKAGE, LOCALEDIR);
textdomain(PACKAGE);
atexit(close_stdout);
while ((c = getopt_long(argc, argv, "hfu", longopts, NULL)) != -1) {
switch(c) {
case 'h':
usage(stdout);
break;
case 'f':
freeze = TRUE;
break;
case 'u':
freeze = FALSE;
break;
default:
usage(stderr);
break;
}
}
if (freeze == -1)
errx(EXIT_FAILURE, _("no action specified"));
if (optind == argc)
errx(EXIT_FAILURE, _("no filename specified"));
path = argv[optind++];
if (optind != argc) {
warnx(_("unexpected number of arguments"));
usage(stderr);
}
fd = open(path, O_RDONLY);
if (fd < 0)
err(EXIT_FAILURE, _("%s: open failed"), path);
if (fstat(fd, &sb) == -1) {
warn(_("stat failed %s"), path);
goto done;
}
if (!S_ISDIR(sb.st_mode)) {
warnx(_("%s: is not a directory"), path);
goto done;
}
if (freeze) {
if (freeze_f(fd)) {
warn(_("%s: freeze failed"), path);
goto done;
}
} else {
if (unfreeze_f(fd)) {
warn(_("%s: unfreeze failed"), path);
goto done;
}
}
rc = EXIT_SUCCESS;
done:
if (fd >= 0)
close(fd);
return rc;
}
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