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      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 
     21 int 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