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 WIPE_IS_SUPPORTED
21
22#if defined(__linux__)
23
24#include <linux/fs.h>
25#include <sys/ioctl.h>
26
27#ifndef BLKDISCARD
28#define BLKDISCARD _IO(0x12,119)
29#endif
30
31#ifndef BLKSECDISCARD
32#define BLKSECDISCARD _IO(0x12,125)
33#endif
34
35int wipe_block_device(int fd, s64 len)
36{
37	u64 range[2];
38	int ret;
39
40	if (!is_block_device_fd(fd)) {
41		// Wiping only makes sense on a block device.
42		return 0;
43	}
44
45	range[0] = 0;
46	range[1] = len;
47	ret = ioctl(fd, BLKSECDISCARD, &range);
48	if (ret < 0) {
49		range[0] = 0;
50		range[1] = len;
51		ret = ioctl(fd, BLKDISCARD, &range);
52		if (ret < 0) {
53			warn("Discard failed\n");
54			return 1;
55		} else {
56			warn("Wipe via secure discard failed, used discard instead\n");
57			return 0;
58		}
59	}
60
61	return 0;
62}
63
64#else  /* __linux__ */
65#error "Missing block device wiping implementation for this platform!"
66#endif
67
68#else  /* WIPE_IS_SUPPORTED */
69
70int wipe_block_device(int fd, s64 len)
71{
72	/* Wiping is not supported on this platform. */
73	return 1;
74}
75
76#endif  /* WIPE_IS_SUPPORTED */
77