/* * 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 __cplusplusextern "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_ */ /** * @} */