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/wipe.h"
18
19 #include "ext4_utils/ext4_utils.h"
20
21 #if WIPE_IS_SUPPORTED
22
23 #if defined(__linux__)
24
25 #include <linux/fs.h>
26 #include <sys/ioctl.h>
27
28 #ifndef BLKDISCARD
29 #define BLKDISCARD _IO(0x12,119)
30 #endif
31
32 #ifndef BLKSECDISCARD
33 #define BLKSECDISCARD _IO(0x12,125)
34 #endif
35
wipe_block_device(int fd,s64 len)36 int wipe_block_device(int fd, s64 len)
37 {
38 u64 range[2];
39 int ret;
40
41 if (!is_block_device_fd(fd)) {
42 // Wiping only makes sense on a block device.
43 return 0;
44 }
45
46 range[0] = 0;
47 range[1] = len;
48 ret = ioctl(fd, BLKSECDISCARD, &range);
49 if (ret < 0) {
50 range[0] = 0;
51 range[1] = len;
52 ret = ioctl(fd, BLKDISCARD, &range);
53 if (ret < 0) {
54 warn("Discard failed\n");
55 return 1;
56 } else {
57 warn("Wipe via secure discard failed, used discard instead\n");
58 return 0;
59 }
60 }
61
62 return 0;
63 }
64
65 #else /* __linux__ */
66 #error "Missing block device wiping implementation for this platform!"
67 #endif
68
69 #else /* WIPE_IS_SUPPORTED */
70
wipe_block_device(int fd,s64 len)71 int wipe_block_device(int fd, s64 len)
72 {
73 /* Wiping is not supported on this platform. */
74 return 1;
75 }
76
77 #endif /* WIPE_IS_SUPPORTED */
78