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https://git.openwrt.org/project/make_ext4fs.git
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48 lines
1.5 KiB
C
48 lines
1.5 KiB
C
/*
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* Copyright (C) 2014 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <errno.h>
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#include "ext4_sb.h"
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int ext4_parse_sb(struct ext4_super_block *sb, struct fs_info *info)
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{
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uint64_t len_blocks;
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if (sb->s_magic != EXT4_SUPER_MAGIC)
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return -EINVAL;
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if ((sb->s_state & EXT4_VALID_FS) != EXT4_VALID_FS)
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return -EINVAL;
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info->block_size = 1024 << sb->s_log_block_size;
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info->blocks_per_group = sb->s_blocks_per_group;
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info->inodes_per_group = sb->s_inodes_per_group;
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info->inode_size = sb->s_inode_size;
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info->inodes = sb->s_inodes_count;
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info->feat_ro_compat = sb->s_feature_ro_compat;
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info->feat_compat = sb->s_feature_compat;
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info->feat_incompat = sb->s_feature_incompat;
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info->bg_desc_reserve_blocks = sb->s_reserved_gdt_blocks;
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info->label = sb->s_volume_name;
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len_blocks = ((uint64_t)sb->s_blocks_count_hi << 32) +
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sb->s_blocks_count_lo;
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info->len = (uint64_t)info->block_size * len_blocks;
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return 0;
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}
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