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/*
* Copyright (C) 2011, 2012 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <stdlib.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <linux/fs.h>
#include <errno.h>
typedef unsigned long long u64;
#ifndef BLKDISCARD
#define BLKDISCARD _IO(0x12,119)
#endif
#ifndef BLKSECDISCARD
#define BLKSECDISCARD _IO(0x12,125)
#endif
static u64 get_block_device_size(int fd)
{
u64 size = 0;
int ret;
ret = ioctl(fd, BLKGETSIZE64, &size);
if (ret)
return 0;
return size;
}
static int wipe_block_device(int fd, u64 len, int secure)
{
u64 range[2];
int ret;
int req;
range[0] = 0;
range[1] = len;
if (secure) {
req = BLKSECDISCARD;
} else {
req = BLKDISCARD;
}
ret = ioctl(fd, req, &range);
if (ret < 0) {
fprintf(stderr, "%s discard failed, errno = %d\n",
secure ? "Secure" : "Nonsecure", errno);
}
return ret;
}
static void usage(void)
{
fprintf(stderr, "Usage: wipe_blkdev [-s] <partition>\n");
exit(1);
}
int main(int argc, char *argv[])
{
int secure = 0;
char *devname;
int fd;
u64 len;
struct stat statbuf;
int ret;
if ((argc != 2) && (argc != 3)) {
usage();
}
if (argc == 3) {
if (!strcmp(argv[1], "-s")) {
secure = 1;
devname = argv[2];
} else {
usage();
}
} else {
devname = argv[1];
}
fd = open(devname, O_RDWR);
if (fd < 0) {
fprintf(stderr, "Cannot open device %s\n", devname);
exit(1);
}
if (fstat(fd, &statbuf) < 0) {
fprintf(stderr, "Cannot stat %s\n", devname);
exit(1);
}
if (!S_ISBLK(statbuf.st_mode)) {
fprintf(stderr, "%s is not a block device\n", devname);
exit(1);
}
len = get_block_device_size(fd);
if (! len) {
fprintf(stderr, "Cannot get size of block device %s\n", devname);
exit(1);
}
ret = wipe_block_device(fd, len, secure);
close(fd);
return ret;
}
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