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/*
* fstrim.c -- discard the part (or whole) of mounted filesystem.
*
* Copyright (C) 2010 Red Hat, Inc. All rights reserved.
* Written by Lukas Czerner <lczerner@redhat.com>
* Karel Zak <kzak@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 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*
* This program uses FITRIM ioctl to discard parts or the whole filesystem
* online (mounted). You can specify range (start and length) to be
* discarded, or simply discard whole filesystem.
*/
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <stdint.h>
#include <fcntl.h>
#include <limits.h>
#include <getopt.h>
#include <err.h>
#include <error.h>
#include <errno.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <linux/fs.h>
#include "nls.h"
#include "strutils.h"
#ifndef FITRIM
struct fstrim_range {
uint64_t start;
uint64_t len;
uint64_t minlen;
};
#define FITRIM _IOWR('X', 121, struct fstrim_range)
#endif
static void __attribute__((__noreturn__)) usage(FILE *out)
{
fprintf(out, _("Usage: %s [options] <mount point>\n\nOptions:\n"),
program_invocation_short_name);
fprintf(out, _(
" -h, --help this help\n"
" -o, --offset <num> offset in bytes to discard from\n"
" -l, --length <num> length of bytes to discard from the offset\n"
" -m, --minimum <num> minimum extent length to discard\n"
" -v, --verbose print number of discarded bytes\n"));
fprintf(out, _("\nFor more information see fstrim(1).\n"));
exit(out == stderr ? EXIT_FAILURE : EXIT_SUCCESS);
}
int main(int argc, char **argv)
{
char *path;
int c, fd, verbose = 0;
struct fstrim_range range;
struct stat sb;
struct option longopts[] = {
{ "help", 0, 0, 'h' },
{ "offset", 1, 0, 'o' },
{ "length", 1, 0, 'l' },
{ "minimum", 1, 0, 'm' },
{ "verbose", 0, 0, 'v' },
{ NULL, 0, 0, 0 }
};
setlocale(LC_ALL, "");
bindtextdomain(PACKAGE, LOCALEDIR);
textdomain(PACKAGE);
memset(&range, 0, sizeof(range));
range.len = ULLONG_MAX;
while ((c = getopt_long(argc, argv, "ho:l:m:v", longopts, NULL)) != -1) {
switch(c) {
case 'h':
usage(stdout);
break;
case 'l':
if (strtosize(optarg, &range.len))
errx(EXIT_FAILURE,
_("failed to parse length: %s"), optarg);
break;
case 'o':
if (strtosize(optarg, &range.start))
errx(EXIT_FAILURE,
_("failed to parse offset: %s"), optarg);
break;
case 'm':
if (strtosize(optarg, &range.minlen))
errx(EXIT_FAILURE,
_("failed to parse minimal extend length: %s"),
optarg);
break;
case 'v':
verbose = 1;
break;
default:
usage(stderr);
break;
}
}
if (optind == argc)
errx(EXIT_FAILURE, _("no mountpoint specified."));
path = argv[optind++];
if (optind != argc) {
warnx(_("unexpected number of arguments"));
usage(stderr);
}
if (stat(path, &sb) == -1)
err(EXIT_FAILURE, _("%s: stat failed"), path);
if (!S_ISDIR(sb.st_mode))
errx(EXIT_FAILURE, _("%s: not a directory"), path);
fd = open(path, O_RDONLY);
if (fd < 0)
err(EXIT_FAILURE, _("%s: open failed"), path);
if (ioctl(fd, FITRIM, &range)) {
int errsv = errno;
close(fd);
error(EXIT_FAILURE, errsv, _("%s: FITRIM ioctl failed"), path);
}
if (verbose)
printf(_("%s: %" PRIu64 " bytes was trimmed\n"),
path, range.len);
close(fd);
return EXIT_SUCCESS;
}
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