Colin Cross | c247065 | 2011-01-26 16:39:46 -0800 | [diff] [blame] | 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 | |
David 'Digit' Turner | eb5fcc3 | 2014-06-12 20:54:50 +0200 | [diff] [blame] | 20 | #if WIPE_IS_SUPPORTED |
| 21 | |
Colin Cross | c247065 | 2011-01-26 16:39:46 -0800 | [diff] [blame] | 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 | |
Ken Sumrall | 3e62059 | 2011-02-11 18:36:42 -0800 | [diff] [blame] | 35 | int wipe_block_device(int fd, s64 len) |
Colin Cross | c247065 | 2011-01-26 16:39:46 -0800 | [diff] [blame] | 36 | { |
| 37 | u64 range[2]; |
| 38 | int ret; |
| 39 | |
David 'Digit' Turner | eb5fcc3 | 2014-06-12 20:54:50 +0200 | [diff] [blame] | 40 | if (!is_block_device_fd(fd)) { |
| 41 | // Wiping only makes sense on a block device. |
| 42 | return 0; |
| 43 | } |
| 44 | |
Colin Cross | c247065 | 2011-01-26 16:39:46 -0800 | [diff] [blame] | 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) { |
Ken Sumrall | 427c3a2 | 2011-03-22 20:18:02 -0700 | [diff] [blame] | 53 | warn("Discard failed\n"); |
Colin Cross | c247065 | 2011-01-26 16:39:46 -0800 | [diff] [blame] | 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 | } |
David 'Digit' Turner | eb5fcc3 | 2014-06-12 20:54:50 +0200 | [diff] [blame] | 63 | |
| 64 | #else /* __linux__ */ |
| 65 | #error "Missing block device wiping implementation for this platform!" |
Colin Cross | c247065 | 2011-01-26 16:39:46 -0800 | [diff] [blame] | 66 | #endif |
| 67 | |
David 'Digit' Turner | eb5fcc3 | 2014-06-12 20:54:50 +0200 | [diff] [blame] | 68 | #else /* WIPE_IS_SUPPORTED */ |
| 69 | |
| 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 */ |