From d9e2d0dd144c2c06bff590c35400965016e55b7c Mon Sep 17 00:00:00 2001 From: Lukas Czerner Date: Thu, 25 Nov 2010 00:05:37 +0100 Subject: fstrim: add new command fstrim is used on a mounted filesystem to discard (or "trim") blocks which are not in use by the filesystem. This is useful for solid-state drives (SSDs) and thinly-provisioned storage Signed-off-by: Lukas Czerner Signed-off-by: Karel Zak --- sys-utils/fstrim.c | 154 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 154 insertions(+) create mode 100644 sys-utils/fstrim.c (limited to 'sys-utils/fstrim.c') diff --git a/sys-utils/fstrim.c b/sys-utils/fstrim.c new file mode 100644 index 000000000..fd83d3111 --- /dev/null +++ b/sys-utils/fstrim.c @@ -0,0 +1,154 @@ +/* + * fstrim.c -- discard the part (or whole) of mounted filesystem. + * + * Copyright (C) 2010 Red Hat, Inc. All rights reserved. + * Written by Lukas Czerner + * Karel Zak + * + * 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 . + * + * + * 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 while filesystem. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include + +#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] \n\nOptions:\n"), + program_invocation_short_name); + + fprintf(out, _( + " -h, --help this help\n" + " -o, --offset offset in bytes to discard from\n" + " -l, --length length of bytes to discard from the offset\n" + " -m, --minimum 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; +} -- cgit v1.2.3-55-g7522