| /* |
| * blkdiscard.c -- discard the part (or whole) of the block device. |
| * |
| * Copyright (C) 2012 Red Hat, Inc. All rights reserved. |
| * Written by Lukas Czerner <lczerner@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 BLKDISCARD ioctl to discard part or the whole block |
| * device if the device supports it. You can specify range (start and |
| * length) to be discarded, or simply discard the whole device. |
| */ |
| |
| |
| #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 <time.h> |
| |
| #include <sys/ioctl.h> |
| #include <sys/stat.h> |
| #include <sys/time.h> |
| #include <linux/fs.h> |
| |
| #include "nls.h" |
| #include "strutils.h" |
| #include "c.h" |
| #include "closestream.h" |
| #include "monotonic.h" |
| |
| #ifndef BLKDISCARD |
| # define BLKDISCARD _IO(0x12,119) |
| #endif |
| |
| #ifndef BLKSECDISCARD |
| # define BLKSECDISCARD _IO(0x12,125) |
| #endif |
| |
| #ifndef BLKZEROOUT |
| # define BLKZEROOUT _IO(0x12,127) |
| #endif |
| |
| enum { |
| ACT_DISCARD = 0, /* default */ |
| ACT_ZEROOUT, |
| ACT_SECURE |
| }; |
| |
| static void print_stats(int act, char *path, uint64_t stats[]) |
| { |
| switch (act) { |
| case ACT_ZEROOUT: |
| printf(_("%s: Zero-filled %" PRIu64 " bytes from the offset %" PRIu64"\n"), \ |
| path, stats[1], stats[0]); |
| break; |
| case ACT_SECURE: |
| case ACT_DISCARD: |
| printf(_("%s: Discarded %" PRIu64 " bytes from the offset %" PRIu64"\n"), \ |
| path, stats[1], stats[0]); |
| break; |
| } |
| } |
| |
| static void __attribute__((__noreturn__)) usage(FILE *out) |
| { |
| fputs(USAGE_HEADER, out); |
| fprintf(out, |
| _(" %s [options] <device>\n"), program_invocation_short_name); |
| |
| fputs(USAGE_SEPARATOR, out); |
| fputs(_("Discard the content of sectors on a device.\n"), out); |
| |
| fputs(USAGE_OPTIONS, out); |
| fputs(_(" -o, --offset <num> offset in bytes to discard from\n"), out); |
| fputs(_(" -l, --length <num> length of bytes to discard from the offset\n"), out); |
| fputs(_(" -p, --step <num> size of the discard iterations within the offset\n"), out); |
| fputs(_(" -s, --secure perform secure discard\n"), out); |
| fputs(_(" -z, --zeroout zero-fill rather than discard\n"), out); |
| fputs(_(" -v, --verbose print aligned length and offset\n"), out); |
| |
| fputs(USAGE_SEPARATOR, out); |
| fputs(USAGE_HELP, out); |
| fputs(USAGE_VERSION, out); |
| |
| fprintf(out, USAGE_MAN_TAIL("blkdiscard(8)")); |
| exit(out == stderr ? EXIT_FAILURE : EXIT_SUCCESS); |
| } |
| |
| |
| int main(int argc, char **argv) |
| { |
| char *path; |
| int c, fd, verbose = 0, secsize; |
| uint64_t end, blksize, step, range[2], stats[2]; |
| struct stat sb; |
| struct timeval now, last; |
| int act = ACT_DISCARD; |
| |
| static const struct option longopts[] = { |
| { "help", no_argument, NULL, 'h' }, |
| { "version", no_argument, NULL, 'V' }, |
| { "offset", required_argument, NULL, 'o' }, |
| { "length", required_argument, NULL, 'l' }, |
| { "step", required_argument, NULL, 'p' }, |
| { "secure", no_argument, NULL, 's' }, |
| { "verbose", no_argument, NULL, 'v' }, |
| { "zeroout", no_argument, NULL, 'z' }, |
| { NULL, 0, NULL, 0 } |
| }; |
| |
| setlocale(LC_ALL, ""); |
| bindtextdomain(PACKAGE, LOCALEDIR); |
| textdomain(PACKAGE); |
| atexit(close_stdout); |
| |
| range[0] = 0; |
| range[1] = ULLONG_MAX; |
| step = 0; |
| |
| while ((c = getopt_long(argc, argv, "hVsvo:l:p:z", longopts, NULL)) != -1) { |
| switch(c) { |
| case 'h': |
| usage(stdout); |
| break; |
| case 'V': |
| printf(UTIL_LINUX_VERSION); |
| return EXIT_SUCCESS; |
| case 'l': |
| range[1] = strtosize_or_err(optarg, |
| _("failed to parse length")); |
| break; |
| case 'o': |
| range[0] = strtosize_or_err(optarg, |
| _("failed to parse offset")); |
| break; |
| case 'p': |
| step = strtosize_or_err(optarg, |
| _("failed to parse step")); |
| break; |
| case 's': |
| act = ACT_SECURE; |
| break; |
| case 'v': |
| verbose = 1; |
| break; |
| case 'z': |
| act = ACT_ZEROOUT; |
| break; |
| default: |
| errtryhelp(EXIT_FAILURE); |
| } |
| } |
| |
| if (optind == argc) |
| errx(EXIT_FAILURE, _("no device specified")); |
| |
| path = argv[optind++]; |
| |
| if (optind != argc) { |
| warnx(_("unexpected number of arguments")); |
| usage(stderr); |
| } |
| |
| fd = open(path, O_WRONLY); |
| if (fd < 0) |
| err(EXIT_FAILURE, _("cannot open %s"), path); |
| |
| if (fstat(fd, &sb) == -1) |
| err(EXIT_FAILURE, _("stat of %s failed"), path); |
| if (!S_ISBLK(sb.st_mode)) |
| errx(EXIT_FAILURE, _("%s: not a block device"), path); |
| |
| if (ioctl(fd, BLKGETSIZE64, &blksize)) |
| err(EXIT_FAILURE, _("%s: BLKGETSIZE64 ioctl failed"), path); |
| if (ioctl(fd, BLKSSZGET, &secsize)) |
| err(EXIT_FAILURE, _("%s: BLKSSZGET ioctl failed"), path); |
| |
| /* check offset alignment to the sector size */ |
| if (range[0] % secsize) |
| errx(EXIT_FAILURE, _("%s: offset %" PRIu64 " is not aligned " |
| "to sector size %i"), path, range[0], secsize); |
| |
| /* is the range end behind the end of the device ?*/ |
| if (range[0] > blksize) |
| errx(EXIT_FAILURE, _("%s: offset is greater than device size"), path); |
| end = range[0] + range[1]; |
| if (end < range[0] || end > blksize) |
| end = blksize; |
| |
| range[1] = (step > 0) ? step : end - range[0]; |
| |
| /* check length alignment to the sector size */ |
| if (range[1] % secsize) |
| errx(EXIT_FAILURE, _("%s: length %" PRIu64 " is not aligned " |
| "to sector size %i"), path, range[1], secsize); |
| |
| stats[0] = range[0], stats[1] = 0; |
| gettime_monotonic(&last); |
| |
| for (/* nothing */; range[0] < end; range[0] += range[1]) { |
| if (range[0] + range[1] > end) |
| range[1] = end - range[0]; |
| |
| switch (act) { |
| case ACT_ZEROOUT: |
| if (ioctl(fd, BLKZEROOUT, &range)) |
| err(EXIT_FAILURE, _("%s: BLKZEROOUT ioctl failed"), path); |
| break; |
| case ACT_SECURE: |
| if (ioctl(fd, BLKSECDISCARD, &range)) |
| err(EXIT_FAILURE, _("%s: BLKSECDISCARD ioctl failed"), path); |
| break; |
| case ACT_DISCARD: |
| if (ioctl(fd, BLKDISCARD, &range)) |
| err(EXIT_FAILURE, _("%s: BLKDISCARD ioctl failed"), path); |
| break; |
| } |
| |
| stats[1] += range[1]; |
| |
| /* reporting progress at most once per second */ |
| if (verbose && step) { |
| gettime_monotonic(&now); |
| if (now.tv_sec > last.tv_sec && |
| (now.tv_usec >= last.tv_usec || now.tv_sec > last.tv_sec + 1)) { |
| print_stats(act, path, stats); |
| stats[0] += stats[1], stats[1] = 0; |
| last = now; |
| } |
| } |
| } |
| |
| if (verbose && stats[1]) |
| print_stats(act, path, stats); |
| |
| close(fd); |
| return EXIT_SUCCESS; |
| } |