ref: ec5adbc6757768592da6917a07f6bc1c588ad2f8
dir: /include/ext4_block_group.h/
/*
* Copyright (c) 2013 Grzegorz Kostka (kostka.grzegorz@gmail.com)
*
*
* HelenOS:
* Copyright (c) 2012 Martin Sucha
* Copyright (c) 2012 Frantisek Princ
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* - The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/** @addtogroup lwext4
* @{
*/
/**
* @file ext4_block_group.h
* @brief Block group function set.
*/
#ifndef EXT4_BLOCK_GROUP_H_
#define EXT4_BLOCK_GROUP_H_
#ifdef __cplusplus
extern "C" {
#endif
#include "ext4_config.h"
#include "ext4_types.h"
#include "ext4_super.h"
#include <stdint.h>
#include <stdbool.h>
/**@brief Get address of block with data block bitmap.
* @param bg pointer to block group
* @param s pointer to superblock
* @return Address of block with block bitmap
*/
static inline uint64_t ext4_bg_get_block_bitmap(struct ext4_bgroup *bg,
struct ext4_sblock *s)
{
uint64_t v = to_le32(bg->block_bitmap_lo);
if (ext4_sb_get_desc_size(s) > EXT4_MIN_BLOCK_GROUP_DESCRIPTOR_SIZE)
v |= (uint64_t)to_le32(bg->block_bitmap_hi) << 32;
return v;
}
/**@brief Set address of block with data block bitmap.
* @param bg pointer to block group
* @param s pointer to superblock
* @param blk block to set
* @return Address of block with block bitmap
*/
static inline void ext4_bg_set_block_bitmap(struct ext4_bgroup *bg,
struct ext4_sblock *s, uint64_t blk)
{
bg->block_bitmap_lo = to_le32((uint32_t)blk);
if (ext4_sb_get_desc_size(s) > EXT4_MIN_BLOCK_GROUP_DESCRIPTOR_SIZE)
bg->block_bitmap_hi = to_le32(blk >> 32);
}
/**@brief Get address of block with i-node bitmap.
* @param bg Pointer to block group
* @param s Pointer to superblock
* @return Address of block with i-node bitmap
*/
static inline uint64_t ext4_bg_get_inode_bitmap(struct ext4_bgroup *bg,
struct ext4_sblock *s)
{
uint64_t v = to_le32(bg->inode_bitmap_lo);
if (ext4_sb_get_desc_size(s) > EXT4_MIN_BLOCK_GROUP_DESCRIPTOR_SIZE)
v |= (uint64_t)to_le32(bg->inode_bitmap_hi) << 32;
return v;
}
/**@brief Set address of block with i-node bitmap.
* @param bg Pointer to block group
* @param s Pointer to superblock
* @param blk block to set
* @return Address of block with i-node bitmap
*/
static inline void ext4_bg_set_inode_bitmap(struct ext4_bgroup *bg,
struct ext4_sblock *s, uint64_t blk)
{
bg->inode_bitmap_lo = to_le32((uint32_t)blk);
if (ext4_sb_get_desc_size(s) > EXT4_MIN_BLOCK_GROUP_DESCRIPTOR_SIZE)
bg->inode_bitmap_hi = to_le32(blk >> 32);
}
/**@brief Get address of the first block of the i-node table.
* @param bg Pointer to block group
* @param s Pointer to superblock
* @return Address of first block of i-node table
*/
static inline uint64_t
ext4_bg_get_inode_table_first_block(struct ext4_bgroup *bg,
struct ext4_sblock *s)
{
uint64_t v = to_le32(bg->inode_table_first_block_lo);
if (ext4_sb_get_desc_size(s) > EXT4_MIN_BLOCK_GROUP_DESCRIPTOR_SIZE)
v |= (uint64_t)to_le32(bg->inode_table_first_block_hi) << 32;
return v;
}
/**@brief Set address of the first block of the i-node table.
* @param bg Pointer to block group
* @param s Pointer to superblock
* @param blk block to set
* @return Address of first block of i-node table
*/
static inline void
ext4_bg_set_inode_table_first_block(struct ext4_bgroup *bg,
struct ext4_sblock *s, uint64_t blk)
{
bg->inode_table_first_block_lo = to_le32((uint32_t)blk);
if (ext4_sb_get_desc_size(s) > EXT4_MIN_BLOCK_GROUP_DESCRIPTOR_SIZE)
bg->inode_table_first_block_hi = to_le32(blk >> 32);
}
/**@brief Get number of free blocks in block group.
* @param bg Pointer to block group
* @param sb Pointer to superblock
* @return Number of free blocks in block group
*/
static inline uint32_t ext4_bg_get_free_blocks_count(struct ext4_bgroup *bg,
struct ext4_sblock *s)
{
uint32_t v = to_le16(bg->free_blocks_count_lo);
if (ext4_sb_get_desc_size(s) > EXT4_MIN_BLOCK_GROUP_DESCRIPTOR_SIZE)
v |= (uint32_t)to_le16(bg->free_blocks_count_hi) << 16;
return v;
}
/**@brief Set number of free blocks in block group.
* @param bg Pointer to block group
* @param s Pointer to superblock
* @param cnt Number of free blocks in block group
*/
static inline void ext4_bg_set_free_blocks_count(struct ext4_bgroup *bg,
struct ext4_sblock *s,
uint32_t cnt)
{
bg->free_blocks_count_lo = to_le16((cnt << 16) >> 16);
if (ext4_sb_get_desc_size(s) > EXT4_MIN_BLOCK_GROUP_DESCRIPTOR_SIZE)
bg->free_blocks_count_hi = to_le16(cnt >> 16);
}
/**@brief Get number of free i-nodes in block group.
* @param bg Pointer to block group
* @param s Pointer to superblock
* @return Number of free i-nodes in block group
*/
static inline uint32_t ext4_bg_get_free_inodes_count(struct ext4_bgroup *bg,
struct ext4_sblock *s)
{
uint32_t v = to_le16(bg->free_inodes_count_lo);
if (ext4_sb_get_desc_size(s) > EXT4_MIN_BLOCK_GROUP_DESCRIPTOR_SIZE)
v |= (uint32_t)to_le16(bg->free_inodes_count_hi) << 16;
return v;
}
/**@brief Set number of free i-nodes in block group.
* @param bg Pointer to block group
* @param s Pointer to superblock
* @param cnt Number of free i-nodes in block group
*/
static inline void ext4_bg_set_free_inodes_count(struct ext4_bgroup *bg,
struct ext4_sblock *s,
uint32_t cnt)
{
bg->free_inodes_count_lo = to_le16((cnt << 16) >> 16);
if (ext4_sb_get_desc_size(s) > EXT4_MIN_BLOCK_GROUP_DESCRIPTOR_SIZE)
bg->free_inodes_count_hi = to_le16(cnt >> 16);
}
/**@brief Get number of used directories in block group.
* @param bg Pointer to block group
* @param s Pointer to superblock
* @return Number of used directories in block group
*/
static inline uint32_t ext4_bg_get_used_dirs_count(struct ext4_bgroup *bg,
struct ext4_sblock *s)
{
uint32_t v = to_le16(bg->used_dirs_count_lo);
if (ext4_sb_get_desc_size(s) > EXT4_MIN_BLOCK_GROUP_DESCRIPTOR_SIZE)
v |= (uint32_t)to_le16(bg->used_dirs_count_hi) << 16;
return v;
}
/**@brief Set number of used directories in block group.
* @param bg Pointer to block group
* @param s Pointer to superblock
* @param cnt Number of used directories in block group
*/
static inline void ext4_bg_set_used_dirs_count(struct ext4_bgroup *bg,
struct ext4_sblock *s,
uint32_t cnt)
{
bg->used_dirs_count_lo = to_le16((cnt << 16) >> 16);
if (ext4_sb_get_desc_size(s) > EXT4_MIN_BLOCK_GROUP_DESCRIPTOR_SIZE)
bg->used_dirs_count_hi = to_le16(cnt >> 16);
}
/**@brief Get number of unused i-nodes.
* @param bg Pointer to block group
* @param s Pointer to superblock
* @return Number of unused i-nodes
*/
static inline uint32_t ext4_bg_get_itable_unused(struct ext4_bgroup *bg,
struct ext4_sblock *s)
{
uint32_t v = to_le16(bg->itable_unused_lo);
if (ext4_sb_get_desc_size(s) > EXT4_MIN_BLOCK_GROUP_DESCRIPTOR_SIZE)
v |= (uint32_t)to_le16(bg->itable_unused_hi) << 16;
return v;
}
/**@brief Set number of unused i-nodes.
* @param bg Pointer to block group
* @param s Pointer to superblock
* @param cnt Number of unused i-nodes
*/
static inline void ext4_bg_set_itable_unused(struct ext4_bgroup *bg,
struct ext4_sblock *s,
uint32_t cnt)
{
bg->itable_unused_lo = to_le16((cnt << 16) >> 16);
if (ext4_sb_get_desc_size(s) > EXT4_MIN_BLOCK_GROUP_DESCRIPTOR_SIZE)
bg->itable_unused_hi = to_le16(cnt >> 16);
}
/**@brief Set checksum of block group.
* @param bg Pointer to block group
* @param crc Cheksum of block group
*/
static inline void ext4_bg_set_checksum(struct ext4_bgroup *bg, uint16_t crc)
{
bg->checksum = to_le16(crc);
}
/**@brief Check if block group has a flag.
* @param bg Pointer to block group
* @param flag Flag to be checked
* @return True if flag is set to 1
*/
static inline bool ext4_bg_has_flag(struct ext4_bgroup *bg, uint32_t f)
{
return to_le16(bg->flags) & f;
}
/**@brief Set flag of block group.
* @param bg Pointer to block group
* @param flag Flag to be set
*/
static inline void ext4_bg_set_flag(struct ext4_bgroup *bg, uint32_t f)
{
uint16_t flags = to_le16(bg->flags);
flags |= f;
bg->flags = to_le16(flags);
}
/**@brief Clear flag of block group.
* @param bg Pointer to block group
* @param flag Flag to be cleared
*/
static inline void ext4_bg_clear_flag(struct ext4_bgroup *bg, uint32_t f)
{
uint16_t flags = to_le16(bg->flags);
flags &= ~f;
bg->flags = to_le16(flags);
}
/**@brief Calculate CRC16 of the block group.
* @param crc Init value
* @param buffer Input buffer
* @param len Sizeof input buffer
* @return Computed CRC16*/
uint16_t ext4_bg_crc16(uint16_t crc, const uint8_t *buffer, size_t len);
#ifdef __cplusplus
}
#endif
#endif /* EXT4_BLOCK_GROUP_H_ */
/**
* @}
*/