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/*
* fstrim.c -- discard the part (or whole) of mounted filesystem.
*
* Copyright (C) 2010,2012 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 <sys/ioctl.h>
#include <sys/stat.h>
#include <linux/fs.h>
#include "nls.h"
#include "strutils.h"
#include "c.h"
#include "closestream.h"
#include "blkdev.h"
#ifndef FITRIM
struct fstrim_range {
uint64_t start;
uint64_t len;
uint64_t minlen;
};
# define FITRIM _IOWR('X', 121, struct fstrim_range)
#endif
#ifndef BLKDISCARD
# define BLKDISCARD _IO(0x12,119)
#endif
#ifndef BLKSECDISCARD
# define BLKSECDISCARD _IO(0x12,125)
#endif
static int is_blk = 0;
static void __attribute__((__noreturn__)) usage(FILE *out)
{
fputs(USAGE_HEADER, out);
if (is_blk) {
fprintf(out, _(" %s [options] <device>\n"), program_invocation_short_name);
fputs(USAGE_OPTIONS, out);
fputs(_(" -s, --secure perform secure discard\n"), out);
} else {
fprintf(out, _(" %s [options] <mountpoint>\n"), program_invocation_short_name);
fputs(USAGE_OPTIONS, out);
fputs(_(" -m, --minimum <num> minimum extent length to discard\n"), out);
}
fputs(_(" -o, --offset <num> offset in bytes to discard from\n"
" -l, --length <num> length of bytes to discard from the offset\n"
" -v, --verbose print number of discarded bytes\n"), out);
fputs(USAGE_SEPARATOR, out);
fputs(USAGE_HELP, out);
fputs(USAGE_VERSION, out);
fprintf(out, USAGE_MAN_TAIL(is_blk ? "blkdiscard(8)" : "fstrim(8)"));
exit(out == stderr ? EXIT_FAILURE : EXIT_SUCCESS);
}
static void do_fstrim(const char *path, uint64_t off, uint64_t len, uint64_t minlen)
{
int fd;
struct stat sb;
struct fstrim_range range;
range.start = off;
range.len = len;
range.minlen = minlen;
fd = open(path, O_RDONLY);
if (fd < 0)
err(EXIT_FAILURE, _("cannot open %s"), path);
if (fstat(fd, &sb) == -1)
err(EXIT_FAILURE, _("stat failed %s"), path);
if (!S_ISDIR(sb.st_mode))
errx(EXIT_FAILURE, _("%s: not a directory"), path);
if (ioctl(fd, FITRIM, &range))
err(EXIT_FAILURE, _("%s: FITRIM ioctl failed"), path);
close(fd);
}
static void do_blkdiscard(const char *path, uint64_t off, uint64_t len, int sec)
{
int fd, secsize;
struct stat sb;
uint64_t blksize, range[2], end;
fd = open(path, O_WRONLY);
if (fd < 0)
err(EXIT_FAILURE, _("cannot open %s"), path);
if (fstat(fd, &sb) == -1)
err(EXIT_FAILURE, _("stat failed %s"), path);
if (!S_ISBLK(sb.st_mode))
errx(EXIT_FAILURE, _("%s: not a block device"), path);
if (blkdev_get_size(fd, (unsigned long long *) &blksize) != 0)
err(EXIT_FAILURE, _("%s: failed to get device size"), path);
if (blkdev_get_sector_size(fd, &secsize) != 0)
err(EXIT_FAILURE, _("%s: failed to get sector size"), path);
/* align range to the sector size */
range[0] = (off + secsize - 1) & ~(secsize - 1);
range[1] = len & ~(secsize - 1);
/* is the range end behind the end of the device ?*/
end = range[0] + range[1];
if (end < range[0] || end > blksize)
range[1] = blksize - range[0];
if (sec) {
if (ioctl(fd, BLKSECDISCARD, &range))
err(EXIT_FAILURE, _("%s: BLKSECDISCARD ioctl failed"), path);
} else {
if (ioctl(fd, BLKDISCARD, &range))
err(EXIT_FAILURE, _("%s: BLKDISCARD ioctl failed"), path);
}
close(fd);
}
int main(int argc, char **argv)
{
char *path;
int c, verbose = 0, secure = 0;
uint64_t len = UINT64_MAX, off = 0, minlen = 0;
static const struct option fs_longopts[] = {
{ "help", 0, 0, 'h' },
{ "version", 0, 0, 'V' },
{ "offset", 1, 0, 'o' },
{ "length", 1, 0, 'l' },
{ "minimum", 1, 0, 'm' },
{ "verbose", 0, 0, 'v' },
{ NULL, 0, 0, 0 }
};
static const struct option blk_longopts[] = {
{ "help", 0, 0, 'h' },
{ "version", 0, 0, 'V' },
{ "offset", 1, 0, 'o' },
{ "length", 1, 0, 'l' },
{ "secure", 0, 0, 's' },
{ "verbose", 0, 0, 'v' },
{ NULL, 0, 0, 0 }
};
setlocale(LC_ALL, "");
bindtextdomain(PACKAGE, LOCALEDIR);
textdomain(PACKAGE);
atexit(close_stdout);
if (strcmp(program_invocation_short_name, "blkdiscard") == 0)
is_blk = 1;
do {
if (is_blk)
c = getopt_long(argc, argv, "hVo:l:sv", blk_longopts, NULL);
else
c = getopt_long(argc, argv, "hVo:l:m:v", fs_longopts, NULL);
if (c == -1)
break;
switch(c) {
case 'h':
usage(stdout);
break;
case 'V':
printf(UTIL_LINUX_VERSION);
return EXIT_SUCCESS;
case 'l':
len = strtosize_or_err(optarg,
_("failed to parse length"));
break;
case 'o':
off = strtosize_or_err(optarg,
_("failed to parse offset"));
break;
case 'm':
minlen = strtosize_or_err(optarg,
_("failed to parse minimum extent length"));
break;
case 's':
secure = 1;
break;
case 'v':
verbose = 1;
break;
default:
usage(stderr);
break;
}
} while (1);
if (optind == argc)
errx(EXIT_FAILURE, is_blk ? _("no device specified.") :
_("no mountpoint specified"));
path = argv[optind++];
if (optind != argc) {
warnx(_("unexpected number of arguments"));
usage(stderr);
}
if (is_blk)
do_blkdiscard(path, off, len, secure);
else
do_fstrim(path, off, len, minlen);
if (verbose)
/* TRANSLATORS: The standard value here is a very large number. */
printf(_("%s: %" PRIu64 " bytes were trimmed\n"), path, len);
return EXIT_SUCCESS;
}
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