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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 "c.h"
#include "blkdev.h"
#include "nls.h"
#include "closestream.h"
#include "optutils.h"
enum fs_operation {
NOOP,
FREEZE,
UNFREEZE
};
static void __attribute__((__noreturn__)) usage(void)
{
FILE *out = stdout;
fputs(USAGE_HEADER, out);
fprintf(out,
_(" %s [options] <mountpoint>\n"), program_invocation_short_name);
fputs(USAGE_SEPARATOR, out);
fputs(_("Suspend access to a filesystem.\n"), out);
fputs(USAGE_OPTIONS, out);
fputs(_(" -f, --freeze freeze the filesystem\n"), out);
fputs(_(" -u, --unfreeze unfreeze the filesystem\n"), out);
fputs(USAGE_SEPARATOR, out);
printf(USAGE_HELP_OPTIONS(19));
printf(USAGE_MAN_TAIL("fsfreeze(8)"));
exit(EXIT_SUCCESS);
}
int main(int argc, char **argv)
{
int fd = -1, c;
int action = NOOP, rc = EXIT_FAILURE;
char *path;
struct stat sb;
static const struct option longopts[] = {
{ "help", no_argument, NULL, 'h' },
{ "freeze", no_argument, NULL, 'f' },
{ "unfreeze", no_argument, NULL, 'u' },
{ "version", no_argument, NULL, 'V' },
{ NULL, 0, NULL, 0 }
};
static const ul_excl_t excl[] = { /* rows and cols in ASCII order */
{ 'f','u' }, /* freeze, unfreeze */
{ 0 }
};
int excl_st[ARRAY_SIZE(excl)] = UL_EXCL_STATUS_INIT;
setlocale(LC_ALL, "");
bindtextdomain(PACKAGE, LOCALEDIR);
textdomain(PACKAGE);
close_stdout_atexit();
while ((c = getopt_long(argc, argv, "hfuV", longopts, NULL)) != -1) {
err_exclusive_options(c, longopts, excl, excl_st);
switch(c) {
case 'f':
action = FREEZE;
break;
case 'u':
action = UNFREEZE;
break;
case 'h':
usage();
case 'V':
print_version(EXIT_SUCCESS);
default:
errtryhelp(EXIT_FAILURE);
}
}
if (action == NOOP)
errx(EXIT_FAILURE, _("neither --freeze or --unfreeze specified"));
if (optind == argc)
errx(EXIT_FAILURE, _("no filename specified"));
path = argv[optind++];
if (optind != argc) {
warnx(_("unexpected number of arguments"));
errtryhelp(EXIT_FAILURE);
}
fd = open(path, O_RDONLY);
if (fd < 0)
err(EXIT_FAILURE, _("cannot open %s"), path);
if (fstat(fd, &sb) == -1) {
warn(_("stat of %s failed"), path);
goto done;
}
if (!S_ISDIR(sb.st_mode)) {
warnx(_("%s: is not a directory"), path);
goto done;
}
switch (action) {
case FREEZE:
if (ioctl(fd, FIFREEZE, 0)) {
warn(_("%s: freeze failed"), path);
goto done;
}
break;
case UNFREEZE:
if (ioctl(fd, FITHAW, 0)) {
warn(_("%s: unfreeze failed"), path);
goto done;
}
break;
default:
abort();
}
rc = EXIT_SUCCESS;
done:
if (fd >= 0)
close(fd);
return rc;
}
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