328 lines
9.6 KiB
C
328 lines
9.6 KiB
C
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/*
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* Copyright (c) 2013 Grzegorz Kostka (kostka.grzegorz@gmail.com)
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*
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*
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* HelenOS:
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* Copyright (c) 2012 Martin Sucha
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* Copyright (c) 2012 Frantisek Princ
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* - The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/** @addtogroup lwext4
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* @{
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*/
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/**
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* @file ext4_block_group.h
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* @brief Block group function set.
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*/
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#ifndef EXT4_BLOCK_GROUP_H_
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#define EXT4_BLOCK_GROUP_H_
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <ext4_config.h>
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#include <ext4_types.h>
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#include <ext4_super.h>
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#include <stdint.h>
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#include <stdbool.h>
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/**@brief Get address of block with data block bitmap.
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* @param bg pointer to block group
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* @param s pointer to superblock
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* @return Address of block with block bitmap
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*/
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static inline uint64_t ext4_bg_get_block_bitmap(struct ext4_bgroup *bg,
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struct ext4_sblock *s)
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{
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uint64_t v = to_le32(bg->block_bitmap_lo);
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if (ext4_sb_get_desc_size(s) > EXT4_MIN_BLOCK_GROUP_DESCRIPTOR_SIZE)
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v |= (uint64_t)to_le32(bg->block_bitmap_hi) << 32;
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return v;
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}
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/**@brief Set address of block with data block bitmap.
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* @param bg pointer to block group
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* @param s pointer to superblock
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* @param blk block to set
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*/
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static inline void ext4_bg_set_block_bitmap(struct ext4_bgroup *bg,
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struct ext4_sblock *s, uint64_t blk)
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{
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bg->block_bitmap_lo = to_le32((uint32_t)blk);
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if (ext4_sb_get_desc_size(s) > EXT4_MIN_BLOCK_GROUP_DESCRIPTOR_SIZE)
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bg->block_bitmap_hi = to_le32(blk >> 32);
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}
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/**@brief Get address of block with i-node bitmap.
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* @param bg Pointer to block group
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* @param s Pointer to superblock
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* @return Address of block with i-node bitmap
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*/
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static inline uint64_t ext4_bg_get_inode_bitmap(struct ext4_bgroup *bg,
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struct ext4_sblock *s)
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{
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uint64_t v = to_le32(bg->inode_bitmap_lo);
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if (ext4_sb_get_desc_size(s) > EXT4_MIN_BLOCK_GROUP_DESCRIPTOR_SIZE)
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v |= (uint64_t)to_le32(bg->inode_bitmap_hi) << 32;
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return v;
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}
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/**@brief Set address of block with i-node bitmap.
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* @param bg Pointer to block group
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* @param s Pointer to superblock
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* @param blk block to set
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*/
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static inline void ext4_bg_set_inode_bitmap(struct ext4_bgroup *bg,
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struct ext4_sblock *s, uint64_t blk)
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{
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bg->inode_bitmap_lo = to_le32((uint32_t)blk);
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if (ext4_sb_get_desc_size(s) > EXT4_MIN_BLOCK_GROUP_DESCRIPTOR_SIZE)
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bg->inode_bitmap_hi = to_le32(blk >> 32);
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}
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/**@brief Get address of the first block of the i-node table.
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* @param bg Pointer to block group
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* @param s Pointer to superblock
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* @return Address of first block of i-node table
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*/
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static inline uint64_t
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ext4_bg_get_inode_table_first_block(struct ext4_bgroup *bg,
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struct ext4_sblock *s)
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{
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uint64_t v = to_le32(bg->inode_table_first_block_lo);
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if (ext4_sb_get_desc_size(s) > EXT4_MIN_BLOCK_GROUP_DESCRIPTOR_SIZE)
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v |= (uint64_t)to_le32(bg->inode_table_first_block_hi) << 32;
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return v;
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}
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/**@brief Set address of the first block of the i-node table.
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* @param bg Pointer to block group
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* @param s Pointer to superblock
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* @param blk block to set
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*/
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static inline void
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ext4_bg_set_inode_table_first_block(struct ext4_bgroup *bg,
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struct ext4_sblock *s, uint64_t blk)
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{
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bg->inode_table_first_block_lo = to_le32((uint32_t)blk);
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if (ext4_sb_get_desc_size(s) > EXT4_MIN_BLOCK_GROUP_DESCRIPTOR_SIZE)
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bg->inode_table_first_block_hi = to_le32(blk >> 32);
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}
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/**@brief Get number of free blocks in block group.
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* @param bg Pointer to block group
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* @param s Pointer to superblock
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* @return Number of free blocks in block group
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*/
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static inline uint32_t ext4_bg_get_free_blocks_count(struct ext4_bgroup *bg,
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struct ext4_sblock *s)
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{
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uint32_t v = to_le16(bg->free_blocks_count_lo);
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if (ext4_sb_get_desc_size(s) > EXT4_MIN_BLOCK_GROUP_DESCRIPTOR_SIZE)
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v |= (uint32_t)to_le16(bg->free_blocks_count_hi) << 16;
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return v;
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}
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/**@brief Set number of free blocks in block group.
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* @param bg Pointer to block group
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* @param s Pointer to superblock
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* @param cnt Number of free blocks in block group
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*/
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static inline void ext4_bg_set_free_blocks_count(struct ext4_bgroup *bg,
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struct ext4_sblock *s,
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uint32_t cnt)
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{
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bg->free_blocks_count_lo = to_le16((cnt << 16) >> 16);
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if (ext4_sb_get_desc_size(s) > EXT4_MIN_BLOCK_GROUP_DESCRIPTOR_SIZE)
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bg->free_blocks_count_hi = to_le16(cnt >> 16);
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}
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/**@brief Get number of free i-nodes in block group.
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* @param bg Pointer to block group
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* @param s Pointer to superblock
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* @return Number of free i-nodes in block group
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*/
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static inline uint32_t ext4_bg_get_free_inodes_count(struct ext4_bgroup *bg,
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struct ext4_sblock *s)
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{
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uint32_t v = to_le16(bg->free_inodes_count_lo);
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if (ext4_sb_get_desc_size(s) > EXT4_MIN_BLOCK_GROUP_DESCRIPTOR_SIZE)
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v |= (uint32_t)to_le16(bg->free_inodes_count_hi) << 16;
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return v;
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}
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/**@brief Set number of free i-nodes in block group.
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* @param bg Pointer to block group
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* @param s Pointer to superblock
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* @param cnt Number of free i-nodes in block group
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*/
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static inline void ext4_bg_set_free_inodes_count(struct ext4_bgroup *bg,
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struct ext4_sblock *s,
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uint32_t cnt)
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{
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bg->free_inodes_count_lo = to_le16((cnt << 16) >> 16);
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if (ext4_sb_get_desc_size(s) > EXT4_MIN_BLOCK_GROUP_DESCRIPTOR_SIZE)
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bg->free_inodes_count_hi = to_le16(cnt >> 16);
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}
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/**@brief Get number of used directories in block group.
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* @param bg Pointer to block group
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* @param s Pointer to superblock
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* @return Number of used directories in block group
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*/
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static inline uint32_t ext4_bg_get_used_dirs_count(struct ext4_bgroup *bg,
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struct ext4_sblock *s)
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{
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uint32_t v = to_le16(bg->used_dirs_count_lo);
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if (ext4_sb_get_desc_size(s) > EXT4_MIN_BLOCK_GROUP_DESCRIPTOR_SIZE)
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v |= (uint32_t)to_le16(bg->used_dirs_count_hi) << 16;
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return v;
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}
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/**@brief Set number of used directories in block group.
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* @param bg Pointer to block group
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* @param s Pointer to superblock
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* @param cnt Number of used directories in block group
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*/
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static inline void ext4_bg_set_used_dirs_count(struct ext4_bgroup *bg,
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struct ext4_sblock *s,
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uint32_t cnt)
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{
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bg->used_dirs_count_lo = to_le16((cnt << 16) >> 16);
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if (ext4_sb_get_desc_size(s) > EXT4_MIN_BLOCK_GROUP_DESCRIPTOR_SIZE)
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bg->used_dirs_count_hi = to_le16(cnt >> 16);
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}
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/**@brief Get number of unused i-nodes.
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* @param bg Pointer to block group
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* @param s Pointer to superblock
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* @return Number of unused i-nodes
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*/
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static inline uint32_t ext4_bg_get_itable_unused(struct ext4_bgroup *bg,
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struct ext4_sblock *s)
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{
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uint32_t v = to_le16(bg->itable_unused_lo);
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if (ext4_sb_get_desc_size(s) > EXT4_MIN_BLOCK_GROUP_DESCRIPTOR_SIZE)
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v |= (uint32_t)to_le16(bg->itable_unused_hi) << 16;
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return v;
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}
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/**@brief Set number of unused i-nodes.
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* @param bg Pointer to block group
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* @param s Pointer to superblock
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* @param cnt Number of unused i-nodes
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*/
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static inline void ext4_bg_set_itable_unused(struct ext4_bgroup *bg,
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struct ext4_sblock *s,
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uint32_t cnt)
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{
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bg->itable_unused_lo = to_le16((cnt << 16) >> 16);
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if (ext4_sb_get_desc_size(s) > EXT4_MIN_BLOCK_GROUP_DESCRIPTOR_SIZE)
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bg->itable_unused_hi = to_le16(cnt >> 16);
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}
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/**@brief Set checksum of block group.
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* @param bg Pointer to block group
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* @param crc Cheksum of block group
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*/
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static inline void ext4_bg_set_checksum(struct ext4_bgroup *bg, uint16_t crc)
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{
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bg->checksum = to_le16(crc);
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}
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/**@brief Check if block group has a flag.
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* @param bg Pointer to block group
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* @param f Flag to be checked
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* @return True if flag is set to 1
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*/
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static inline bool ext4_bg_has_flag(struct ext4_bgroup *bg, uint32_t f)
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{
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return to_le16(bg->flags) & f;
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}
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/**@brief Set flag of block group.
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* @param bg Pointer to block group
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* @param f Flag to be set
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*/
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static inline void ext4_bg_set_flag(struct ext4_bgroup *bg, uint32_t f)
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{
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uint16_t flags = to_le16(bg->flags);
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flags |= f;
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bg->flags = to_le16(flags);
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}
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/**@brief Clear flag of block group.
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* @param bg Pointer to block group
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* @param f Flag to be cleared
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*/
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static inline void ext4_bg_clear_flag(struct ext4_bgroup *bg, uint32_t f)
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{
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uint16_t flags = to_le16(bg->flags);
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flags &= ~f;
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bg->flags = to_le16(flags);
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}
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/**@brief Calculate CRC16 of the block group.
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* @param crc Init value
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* @param buffer Input buffer
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* @param len Sizeof input buffer
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* @return Computed CRC16*/
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uint16_t ext4_bg_crc16(uint16_t crc, const uint8_t *buffer, size_t len);
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#ifdef __cplusplus
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}
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#endif
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#endif /* EXT4_BLOCK_GROUP_H_ */
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/**
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* @}
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*/
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