fs/exfat/exfat_cache.h

/*
 *  Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
 *
 *  This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU General Public License
 *  as published by the Free Software Foundation; either version 2
 *  of the License, or (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 */

/************************************************************************/
/*                                                                      */
/*  PROJECT : exFAT & FAT12/16/32 File System                           */
/*  FILE    : exfat_cache.h                                             */
/*  PURPOSE : Header File for exFAT Cache Manager                       */
/*            (FAT Cache & Buffer Cache)                                */
/*                                                                      */
/*----------------------------------------------------------------------*/
/*  NOTES                                                               */
/*                                                                      */
/*----------------------------------------------------------------------*/
/*  REVISION HISTORY (Ver 0.9)                                          */
/*                                                                      */
/*  - 2010.11.15 [Sung-Kwan Kim] : first writing                        */
/*                                                                      */
/************************************************************************/

#ifndef _EXFAT_CACHE_H
#define _EXFAT_CACHE_H

#include <linux/fs.h>
#include <linux/types.h>
#include "exfat_config.h"

/*----------------------------------------------------------------------*/
/*  Constant & Macro Definitions                                        */
/*----------------------------------------------------------------------*/

#define LOCKBIT                 0x01
#define DIRTYBIT                0x02

/*----------------------------------------------------------------------*/
/*  Type Definitions                                                    */
/*----------------------------------------------------------------------*/

typedef struct __BUF_CACHE_T {
	struct __BUF_CACHE_T *next;
	struct __BUF_CACHE_T *prev;
	struct __BUF_CACHE_T *hash_next;
	struct __BUF_CACHE_T *hash_prev;
	s32                drv;
	sector_t          sec;
	u32               flag;
	struct buffer_head   *buf_bh;
} BUF_CACHE_T;

/*----------------------------------------------------------------------*/
/*  External Function Declarations                                      */
/*----------------------------------------------------------------------*/

s32  buf_init(struct super_block *sb);
s32  buf_shutdown(struct super_block *sb);
s32  FAT_read(struct super_block *sb, u32 loc, u32 *content);
s32  FAT_write(struct super_block *sb, u32 loc, u32 content);
u8 *FAT_getblk(struct super_block *sb, sector_t sec);
void   FAT_modify(struct super_block *sb, sector_t sec);
void   FAT_release_all(struct super_block *sb);
void   FAT_sync(struct super_block *sb);
u8 *buf_getblk(struct super_block *sb, sector_t sec);
void   buf_modify(struct super_block *sb, sector_t sec);
void   buf_lock(struct super_block *sb, sector_t sec);
void   buf_unlock(struct super_block *sb, sector_t sec);
void   buf_release(struct super_block *sb, sector_t sec);
void   buf_release_all(struct super_block *sb);
void   buf_sync(struct super_block *sb);

#endif /* _EXFAT_CACHE_H */