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 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 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
