Mohamad Ayyash | f4a1ddf | 2015-04-01 19:25:28 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2015 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 "squashfs_utils.h" |
| 18 | |
| 19 | #include <cutils/klog.h> |
| 20 | #include <errno.h> |
| 21 | #include <fcntl.h> |
| 22 | #include <stdlib.h> |
| 23 | #include <string.h> |
| 24 | #include <unistd.h> |
| 25 | |
| 26 | #include "squashfs_fs.h" |
| 27 | |
| 28 | #define ERROR(x...) KLOG_ERROR("squashfs_utils", x) |
| 29 | |
| 30 | int squashfs_parse_sb(char *blk_device, struct squashfs_info *info) { |
| 31 | int ret = 0; |
| 32 | struct squashfs_super_block sb; |
| 33 | int data_device; |
| 34 | |
| 35 | data_device = TEMP_FAILURE_RETRY(open(blk_device, O_RDONLY | O_CLOEXEC)); |
| 36 | if (data_device == -1) { |
| 37 | ERROR("Error opening block device (%s)\n", strerror(errno)); |
| 38 | return -1; |
| 39 | } |
| 40 | |
| 41 | if (TEMP_FAILURE_RETRY(read(data_device, &sb, sizeof(sb))) |
| 42 | != sizeof(sb)) { |
| 43 | ERROR("Error reading superblock\n"); |
| 44 | ret = -1; |
| 45 | goto cleanup; |
| 46 | } |
| 47 | if (sb.s_magic != SQUASHFS_MAGIC) { |
| 48 | ERROR("Not a valid squashfs filesystem\n"); |
| 49 | ret = -1; |
| 50 | goto cleanup; |
| 51 | } |
| 52 | |
| 53 | info->block_size = sb.block_size; |
| 54 | info->inodes = sb.inodes; |
| 55 | info->bytes_used = sb.bytes_used; |
| 56 | // by default mksquashfs pads the filesystem to 4K blocks |
| 57 | info->bytes_used_4K_padded = |
| 58 | sb.bytes_used + (4096 - (sb.bytes_used & (4096 - 1))); |
| 59 | |
| 60 | cleanup: |
Elliott Hughes | 1865679 | 2015-05-15 17:20:47 -0700 | [diff] [blame] | 61 | close(data_device); |
Mohamad Ayyash | f4a1ddf | 2015-04-01 19:25:28 -0700 | [diff] [blame] | 62 | return ret; |
| 63 | } |