ref: 4d530fc1bbb24770246a83beb161a4b9d394f817
dir: /include/ext4_balloc.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_balloc.h
* @brief Physical block allocator.
*/
#ifndef EXT4_BALLOC_H_
#define EXT4_BALLOC_H_
#ifdef __cplusplus
extern "C" {
#endif
#include "ext4_config.h"
#include "ext4_types.h"
#include "ext4_fs.h"
#include <stdint.h>
#include <stdbool.h>
/**@brief Compute number of block group from block address.
* @param sb superblock pointer.
* @param baddr Absolute address of block.
* @return Block group index
*/
uint32_t ext4_balloc_get_bgid_of_block(struct ext4_sblock *s,
ext4_fsblk_t baddr);
/**@brief Compute the starting block address of a block group
* @param sb superblock pointer.
* @param bgid block group index
* @return Block address
*/
ext4_fsblk_t ext4_balloc_get_block_of_bgid(struct ext4_sblock *s,
uint32_t bgid);
/**@brief Calculate and set checksum of block bitmap.
* @param sb superblock pointer.
* @param bg block group
* @param bitmap bitmap buffer
*/
void ext4_balloc_set_bitmap_csum(struct ext4_sblock *sb,
struct ext4_bgroup *bg,
void *bitmap);
/**@brief Free block from inode.
* @param inode_ref inode reference
* @param baddr block address
* @return standard error code*/
int ext4_balloc_free_block(struct ext4_inode_ref *inode_ref,
ext4_fsblk_t baddr);
/**@brief Free blocks from inode.
* @param inode_ref inode reference
* @param first block address
* @param count block count
* @return standard error code*/
int ext4_balloc_free_blocks(struct ext4_inode_ref *inode_ref,
ext4_fsblk_t first, uint32_t count);
/**@brief Allocate block procedure.
* @param inode_ref inode reference
* @param goal
* @param baddr allocated block address
* @return standard error code*/
int ext4_balloc_alloc_block(struct ext4_inode_ref *inode_ref,
ext4_fsblk_t goal,
ext4_fsblk_t *baddr);
/**@brief Try allocate selected block.
* @param inode_ref inode reference
* @param baddr block address to allocate
* @param free if baddr is not allocated
* @return standard error code*/
int ext4_balloc_try_alloc_block(struct ext4_inode_ref *inode_ref,
ext4_fsblk_t baddr, bool *free);
#ifdef __cplusplus
}
#endif
#endif /* EXT4_BALLOC_H_ */
/**
* @}
*/