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_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 { 23 uint64_t len_blocks; 24 25 if (sb->s_magic != EXT4_SUPER_MAGIC) 26 return -EINVAL; 27 28 if ((sb->s_state & EXT4_VALID_FS) != EXT4_VALID_FS) 29 return -EINVAL; 30 31 info->block_size = 1024 << sb->s_log_block_size; 32 info->blocks_per_group = sb->s_blocks_per_group; 33 info->inodes_per_group = sb->s_inodes_per_group; 34 info->inode_size = sb->s_inode_size; 35 info->inodes = sb->s_inodes_count; 36 info->feat_ro_compat = sb->s_feature_ro_compat; 37 info->feat_compat = sb->s_feature_compat; 38 info->feat_incompat = sb->s_feature_incompat; 39 info->bg_desc_reserve_blocks = sb->s_reserved_gdt_blocks; 40 info->label = sb->s_volume_name; 41 42 len_blocks = ((uint64_t)sb->s_blocks_count_hi << 32) + 43 sb->s_blocks_count_lo; 44 info->len = (uint64_t)info->block_size * len_blocks; 45 46 return 0; 47 } 48