| /* |
| * 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 <sys/ioctl.h> |
| #include <sys/stat.h> |
| #include <linux/fs.h> |
| |
| #include "nls.h" |
| #include "strutils.h" |
| #include "c.h" |
| #include "closestream.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) |
| { |
| fputs(USAGE_HEADER, out); |
| fprintf(out, |
| _(" %s [options] <mount point>\n"), program_invocation_short_name); |
| fputs(USAGE_OPTIONS, out); |
| fputs(_(" -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"), out); |
| fputs(USAGE_SEPARATOR, out); |
| fputs(USAGE_HELP, out); |
| fputs(USAGE_VERSION, out); |
| fprintf(out, USAGE_MAN_TAIL("fstrim(8)")); |
| 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; |
| |
| static const struct option 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 } |
| }; |
| |
| setlocale(LC_ALL, ""); |
| bindtextdomain(PACKAGE, LOCALEDIR); |
| textdomain(PACKAGE); |
| atexit(close_stdout); |
| |
| memset(&range, 0, sizeof(range)); |
| range.len = ULLONG_MAX; |
| |
| while ((c = getopt_long(argc, argv, "hVo:l:m:v", longopts, NULL)) != -1) { |
| switch(c) { |
| case 'h': |
| usage(stdout); |
| break; |
| case 'V': |
| printf(UTIL_LINUX_VERSION); |
| return EXIT_SUCCESS; |
| case 'l': |
| range.len = strtosize_or_err(optarg, |
| _("failed to parse length")); |
| break; |
| case 'o': |
| range.start = strtosize_or_err(optarg, |
| _("failed to parse offset")); |
| break; |
| case 'm': |
| range.minlen = strtosize_or_err(optarg, |
| _("failed to parse minimum extent length")); |
| 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, _("stat failed %s"), 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, _("cannot open %s"), path); |
| |
| if (ioctl(fd, FITRIM, &range)) |
| err(EXIT_FAILURE, _("%s: FITRIM ioctl failed"), path); |
| |
| if (verbose) |
| /* TRANSLATORS: The standard value here is a very large number. */ |
| printf(_("%s: %" PRIu64 " bytes were trimmed\n"), |
| path, (uint64_t) range.len); |
| close(fd); |
| return EXIT_SUCCESS; |
| } |