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
wipe_block_device(int fd,s64 len)35 int 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
wipe_block_device(int fd,s64 len)70 int 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