120 lines
3.7 KiB
C
120 lines
3.7 KiB
C
/*
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* Copyright (c) 2013 Grzegorz Kostka (kostka.grzegorz@gmail.com)
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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_balloc.h
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* @brief Physical block allocator.
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*/
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#ifndef EXT4_BALLOC_H_
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#define EXT4_BALLOC_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_fs.h>
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#include <stdint.h>
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#include <stdbool.h>
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/**@brief Compute number of block group from block address.
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* @param s superblock pointer.
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* @param baddr Absolute address of block.
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* @return Block group index
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*/
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uint32_t ext4_balloc_get_bgid_of_block(struct ext4_sblock *s,
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ext4_fsblk_t baddr);
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/**@brief Compute the starting block address of a block group
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* @param s superblock pointer.
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* @param bgid block group index
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* @return Block address
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*/
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ext4_fsblk_t ext4_balloc_get_block_of_bgid(struct ext4_sblock *s,
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uint32_t bgid);
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/**@brief Calculate and set checksum of block bitmap.
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* @param sb superblock pointer.
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* @param bg block group
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* @param bitmap bitmap buffer
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*/
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void ext4_balloc_set_bitmap_csum(struct ext4_sblock *sb,
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struct ext4_bgroup *bg,
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void *bitmap);
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/**@brief Free block from inode.
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* @param inode_ref inode reference
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* @param baddr block address
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* @return standard error code*/
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int ext4_balloc_free_block(struct ext4_inode_ref *inode_ref,
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ext4_fsblk_t baddr);
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/**@brief Free blocks from inode.
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* @param inode_ref inode reference
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* @param first block address
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* @param count block count
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* @return standard error code*/
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int ext4_balloc_free_blocks(struct ext4_inode_ref *inode_ref,
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ext4_fsblk_t first, uint32_t count);
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/**@brief Allocate block procedure.
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* @param inode_ref inode reference
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* @param baddr allocated block address
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* @return standard error code*/
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int ext4_balloc_alloc_block(struct ext4_inode_ref *inode_ref,
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ext4_fsblk_t goal,
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ext4_fsblk_t *baddr);
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/**@brief Try allocate selected block.
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* @param inode_ref inode reference
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* @param baddr block address to allocate
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* @param free if baddr is not allocated
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* @return standard error code*/
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int ext4_balloc_try_alloc_block(struct ext4_inode_ref *inode_ref,
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ext4_fsblk_t baddr, bool *free);
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#ifdef __cplusplus
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}
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#endif
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#endif /* EXT4_BALLOC_H_ */
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/**
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* @}
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*/
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