174 lines
4.5 KiB
C
174 lines
4.5 KiB
C
/*
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* blkdiscard.c -- discard the part (or whole) of the block device.
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*
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* Copyright (C) 2012 Red Hat, Inc. All rights reserved.
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* Written by Lukas Czerner <lczerner@redhat.com>
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*
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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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*
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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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*
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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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*
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* This program uses BLKDISCARD ioctl to discard part or the whole block
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* device if the device supports it. You can specify range (start and
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* length) to be discarded, or simply discard the whole device.
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*/
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#include <string.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <stdint.h>
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#include <fcntl.h>
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#include <limits.h>
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#include <getopt.h>
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#include <sys/ioctl.h>
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#include <sys/stat.h>
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#include <linux/fs.h>
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#include "nls.h"
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#include "strutils.h"
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#include "c.h"
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#include "closestream.h"
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#ifndef BLKDISCARD
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#define BLKDISCARD _IO(0x12,119)
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#endif
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#ifndef BLKSECDISCARD
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#define BLKSECDISCARD _IO(0x12,125)
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#endif
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static void __attribute__((__noreturn__)) usage(FILE *out)
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{
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fputs(USAGE_HEADER, out);
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fprintf(out,
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_(" %s [options] <device>\n"), program_invocation_short_name);
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fputs(USAGE_OPTIONS, out);
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fputs(_(" -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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" -s, --secure perform secure discard\n"
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" -v, --verbose print aligned length and offset\n"),
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out);
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fputs(USAGE_SEPARATOR, out);
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fputs(USAGE_HELP, out);
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fputs(USAGE_VERSION, out);
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fprintf(out, USAGE_MAN_TAIL("blkdiscard(8)"));
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exit(out == stderr ? EXIT_FAILURE : EXIT_SUCCESS);
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}
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int main(int argc, char **argv)
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{
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char *path;
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int c, fd, verbose = 0, secure = 0;
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uint64_t end, blksize, secsize, range[2];
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struct stat sb;
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static const struct option longopts[] = {
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{ "help", 0, 0, 'h' },
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{ "version", 0, 0, 'V' },
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{ "offset", 1, 0, 'o' },
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{ "length", 1, 0, 'l' },
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{ "secure", 0, 0, 's' },
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{ "verbose", 0, 0, 'v' },
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{ NULL, 0, 0, 0 }
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};
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setlocale(LC_ALL, "");
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bindtextdomain(PACKAGE, LOCALEDIR);
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textdomain(PACKAGE);
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atexit(close_stdout);
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range[0] = 0;
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range[1] = ULLONG_MAX;
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while ((c = getopt_long(argc, argv, "hVsvo:l:", longopts, NULL)) != -1) {
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switch(c) {
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case 'h':
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usage(stdout);
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break;
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case 'V':
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printf(UTIL_LINUX_VERSION);
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return EXIT_SUCCESS;
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case 'l':
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range[1] = strtosize_or_err(optarg,
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_("failed to parse length"));
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break;
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case 'o':
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range[0] = strtosize_or_err(optarg,
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_("failed to parse offset"));
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break;
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case 's':
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secure = 1;
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break;
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case 'v':
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verbose = 1;
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break;
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default:
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usage(stderr);
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break;
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}
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}
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if (optind == argc)
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errx(EXIT_FAILURE, _("no device 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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usage(stderr);
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}
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if (stat(path, &sb) == -1)
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err(EXIT_FAILURE, _("stat failed %s"), path);
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if (!S_ISBLK(sb.st_mode))
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errx(EXIT_FAILURE, _("%s: not a block device"), path);
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fd = open(path, O_WRONLY);
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if (fd < 0)
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err(EXIT_FAILURE, _("cannot open %s"), path);
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if (ioctl(fd, BLKGETSIZE64, &blksize))
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err(EXIT_FAILURE, _("%s: BLKGETSIZE64 ioctl failed"), path);
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if (ioctl(fd, BLKSSZGET, &secsize))
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err(EXIT_FAILURE, _("%s: BLKSSZGET ioctl failed"), path);
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/* align range to the sector size */
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range[0] = (range[0] + secsize - 1) & ~(secsize - 1);
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range[1] &= ~(secsize - 1);
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/* is the range end behind the end of the device ?*/
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end = range[0] + range[1];
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if (end < range[0] || end > blksize)
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range[1] = blksize - range[0];
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if (secure) {
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if (ioctl(fd, BLKSECDISCARD, &range))
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err(EXIT_FAILURE, _("%s: BLKSECDISCARD ioctl failed"), path);
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} else {
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if (ioctl(fd, BLKDISCARD, &range))
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err(EXIT_FAILURE, _("%s: BLKDISCARD ioctl failed"), path);
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}
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if (verbose)
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/* TRANSLATORS: The standard value here is a very large number. */
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printf(_("%s: Discarded %" PRIu64 " bytes from the "
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"offset %" PRIu64"\n"), path,
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(uint64_t) range[1], (uint64_t) range[0]);
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close(fd);
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return EXIT_SUCCESS;
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}
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