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Diffstat (limited to 'sys-utils/fstrim.c')
-rw-r--r-- | sys-utils/fstrim.c | 153 |
1 files changed, 153 insertions, 0 deletions
diff --git a/sys-utils/fstrim.c b/sys-utils/fstrim.c new file mode 100644 index 0000000..332601d --- /dev/null +++ b/sys-utils/fstrim.c @@ -0,0 +1,153 @@ +/* + * 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; +} |