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