1 /* 2 * Copyright (C) 2014 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 <errno.h> 18 19 #include "ext4_utils/ext4_sb.h" 20 ext4_parse_sb(struct ext4_super_block * sb,struct fs_info * info)21int ext4_parse_sb(struct ext4_super_block* sb, struct fs_info* info) { 22 uint64_t len_blocks; 23 24 if (sb->s_magic != EXT4_SUPER_MAGIC) return -EINVAL; 25 26 info->block_size = 1024 << sb->s_log_block_size; 27 info->blocks_per_group = sb->s_blocks_per_group; 28 info->inodes_per_group = sb->s_inodes_per_group; 29 info->inode_size = sb->s_inode_size; 30 info->inodes = sb->s_inodes_count; 31 info->feat_ro_compat = sb->s_feature_ro_compat; 32 info->feat_compat = sb->s_feature_compat; 33 info->feat_incompat = sb->s_feature_incompat; 34 info->bg_desc_reserve_blocks = sb->s_reserved_gdt_blocks; 35 info->bg_desc_size = (sb->s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT) 36 ? sb->s_desc_size 37 : EXT4_MIN_DESC_SIZE; 38 info->label = sb->s_volume_name; 39 40 len_blocks = ((uint64_t)sb->s_blocks_count_hi << 32) + sb->s_blocks_count_lo; 41 info->len = (uint64_t)info->block_size * len_blocks; 42 43 return 0; 44 } 45