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 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 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
