wipe.c revision c2470654d4b4db09a7052fc5fa108ac21f1b1948 
1/*
2 * Copyright (C) 2011 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#include "ext4_utils.h"
18#include "wipe.h"
19
20#if defined(__linux__)
21
22#include <linux/fs.h>
23#include <sys/ioctl.h>
24
25#ifndef BLKDISCARD
26#define BLKDISCARD _IO(0x12,119)
27#endif
28
29#ifndef BLKSECDISCARD
30#define BLKSECDISCARD _IO(0x12,125)
31#endif
32
33int wipe_block_device(int fd, int len)
34{
35	u64 range[2];
36	int ret;
37
38	range[0] = 0;
39	range[1] = len;
40	ret = ioctl(fd, BLKSECDISCARD, &range);
41	if (ret < 0) {
42		range[0] = 0;
43		range[1] = len;
44		ret = ioctl(fd, BLKDISCARD, &range);
45		if (ret < 0) {
46			error("Discard failed\n");
47			return 1;
48		} else {
49			warn("Wipe via secure discard failed, used discard instead\n");
50			return 0;
51		}
52	}
53
54	return 0;
55}
56#else
57int wipe_block_device(int fd)
58{
59	error("wipe not supported on non-linux platforms");
60	return 1;
61}
62#endif
63
64