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
wipe_block_device(int fd,s64 len)33 int wipe_block_device(int fd, s64 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 warn("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
wipe_block_device(int fd,s64 len)57 int wipe_block_device(int fd, s64 len)
58 {
59 error("wipe not supported on non-linux platforms");
60 return 1;
61 }
62 #endif
63
64