ref: dce5c9e6e964dcf0f56d5c437ae52aacd9ebcb37
dir: /lwext4/ext4_bitmap.h/
/*
* Copyright (c) 2013 Grzegorz Kostka (kostka.grzegorz@gmail.com)
* 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_bitmap.h
* @brief Block/inode bitmap allocator.
*/
#ifndef EXT4_BITMAP_H_
#define EXT4_BITMAP_H_
#include <ext4_config.h>
#include <stdint.h>
#include <stdbool.h>
/**@brief Set bitmap bit.
* @param bmap bitmap
* @param bit bit to set*/
static inline void ext4_bmap_bit_set(uint8_t *bmap, uint32_t bit)
{
*(bmap + (bit >> 3)) |= (1 << (bit & 7));
}
/**@brief Clear bitmap bit.
* @param bmap bitmap buffer
* @param bit bit to clear*/
static inline void ext4_bmap_bit_clr(uint8_t *bmap, uint32_t bit)
{
*(bmap + (bit >> 3)) &= ~(1 << (bit & 7));
}
/**@brief Check if the bitmap bit is set.
* @param bmap bitmap buffer
* @param bit bit to check*/
static inline bool ext4_bmap_is_bit_set(uint8_t *bmap, uint32_t bit)
{
return (*(bmap + (bit >> 3)) & (1 << (bit & 7)));
}
/**@brief Check if the bitmap bit is clear.
* @param bmap bitmap buffer
* @param bit bit to check*/
static inline bool ext4_bmap_is_bit_clr(uint8_t *bmap, uint32_t bit)
{
return !ext4_bmap_is_bit_set(bmap, bit);
}
/**@brief Free range of bits in bitmap.
* @param bmap bitmap buffer
* @param sbit start bit
* @param bcnt bit count*/
void ext4_bmap_bits_free(uint8_t *bmap, uint32_t sbit, uint32_t bcnt);
/**@brief Find first clear bit in bitmap.
* @param sbit start bit of search
* @param ebit end bit of search
* @param bit_id output parameter (first free bit)
* @return standard error code*/
int ext4_bmap_bit_find_clr(uint8_t *bmap, uint32_t sbit, uint32_t ebit,
uint32_t *bit_id);
#endif /* EXT4_BITMAP_H_ */
/**
* @}
*/