132 lines
2.7 KiB
C
132 lines
2.7 KiB
C
/*
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* Copyright (C) 2011, 2012 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/ioctl.h>
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#include <linux/fs.h>
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#include <errno.h>
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typedef unsigned long long u64;
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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 u64 get_block_device_size(int fd)
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{
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u64 size = 0;
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int ret;
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ret = ioctl(fd, BLKGETSIZE64, &size);
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if (ret)
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return 0;
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return size;
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}
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static int wipe_block_device(int fd, u64 len, int secure)
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{
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u64 range[2];
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int ret;
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int req;
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range[0] = 0;
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range[1] = len;
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if (secure) {
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req = BLKSECDISCARD;
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} else {
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req = BLKDISCARD;
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}
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ret = ioctl(fd, req, &range);
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if (ret < 0) {
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fprintf(stderr, "%s discard failed, errno = %d\n",
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secure ? "Secure" : "Nonsecure", errno);
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}
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return ret;
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}
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static void usage(void)
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{
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fprintf(stderr, "Usage: wipe_blkdev [-s] <partition>\n");
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exit(1);
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}
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int main(int argc, char *argv[])
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{
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int secure = 0;
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char *devname;
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int fd;
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u64 len;
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struct stat statbuf;
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int ret;
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if ((argc != 2) && (argc != 3)) {
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usage();
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}
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if (argc == 3) {
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if (!strcmp(argv[1], "-s")) {
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secure = 1;
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devname = argv[2];
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} else {
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usage();
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}
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} else {
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devname = argv[1];
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}
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fd = open(devname, O_RDWR);
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if (fd < 0) {
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fprintf(stderr, "Cannot open device %s\n", devname);
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exit(1);
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}
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if (fstat(fd, &statbuf) < 0) {
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fprintf(stderr, "Cannot stat %s\n", devname);
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exit(1);
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}
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if (!S_ISBLK(statbuf.st_mode)) {
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fprintf(stderr, "%s is not a block device\n", devname);
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exit(1);
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}
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len = get_block_device_size(fd);
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if (! len) {
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fprintf(stderr, "Cannot get size of block device %s\n", devname);
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exit(1);
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}
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ret = wipe_block_device(fd, len, secure);
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close(fd);
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return ret;
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}
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