ref: ac78a04a195dfaec8f98d1a39753256d08210382
dir: /lwext4/ext4_block_group.h/
/*
* Copyright (c) 2013 Grzegorz Kostka ([email protected])
*
*
* 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_
#include <ext4_config.h>
#include <ext4_types.h>
#include <ext4_super.h>
#include <stdint.h>
#include <stdbool.h>
/**@brief TODO: ...*/
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 TODO: ...*/
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 TODO: ...*/
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 TODO: ...*/
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 TODO: ...*/
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 TODO: ...*/
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 TODO: ...*/
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 TODO: ...*/
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 TODO: ...*/
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 TODO: ...*/
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 TODO: ...*/
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 TODO: ...*/
static inline void ext4_bg_set_checksum(struct ext4_bgroup *bg,
uint16_t crc)
{
bg->checksum = to_le16(crc);
}
/**@brief TODO: ...*/
static inline bool ext4_bg_has_flag(struct ext4_bgroup *bg, uint32_t f)
{
return to_le16(bg->flags) & f;
}
/**@brief TODO: ...*/
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 TODO: ...*/
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 TODO: ...*/
uint16_t ext4_bg_crc16(uint16_t crc, const uint8_t *buffer, size_t len);
#endif /* EXT4_BLOCK_GROUP_H_ */
/**
* @}
*/