include/io.h

/*
 * Copyright 1996-2004 by Hans Reiser, licensing governed by 
 * reiserfsprogs/README
 */

#ifndef REISERFSPROGS_IO_H
#define REISERFSPROGS_IO_H

#ifdef HAVE_CONFIG_H
#  include "config.h"
#endif

#include <stdio.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/types.h>

#include "misc.h"

struct buffer_head {
    unsigned long b_blocknr;
    int b_dev;
    unsigned long b_size;
    char * b_data;
    unsigned long b_state;
    unsigned int b_count;
    unsigned int b_list ;
    void (*b_start_io) (unsigned long);
    void (*b_end_io)(struct buffer_head *bh, int uptodate);
    
    struct buffer_head * b_next;
    struct buffer_head * b_prev;
    struct buffer_head * b_hash_next;
    struct buffer_head * b_hash_prev;
};

#define BH_Uptodate	0
#define BH_Dirty	1
#define BH_Lock		2
#define BH_Do_not_flush 3


#define buffer_uptodate(bh) misc_test_bit(BH_Uptodate, &(bh)->b_state)
#define buffer_dirty(bh) misc_test_bit(BH_Dirty, &(bh)->b_state)
#define buffer_locked(bh) misc_test_bit(BH_Lock, &(bh)->b_state)
#define buffer_clean(bh) !misc_test_bit(BH_Dirty, &(bh)->b_state)
#define buffer_do_not_flush(bh) misc_test_bit(BH_Do_not_flush, &(bh)->b_state)
#define mark_buffer_dirty(bh) misc_set_bit(BH_Dirty, &(bh)->b_state)
#define mark_buffer_uptodate(bh,i) misc_set_bit(BH_Uptodate, &(bh)->b_state)
#define mark_buffer_clean(bh) misc_clear_bit(BH_Dirty, &(bh)->b_state)
#define mark_buffer_do_not_flush(bh) misc_set_bit(BH_Do_not_flush, &(bh)->b_state)
#define clear_buffer_do_not_flush(bh) misc_clear_bit(BH_Do_not_flush, &(bh)->b_state)

/*
printf ("%s:%s:%u %p %p %p\n", 
__FILE__, __FUNCTION__, __LINE__,
	__builtin_return_address (0),
	__builtin_return_address (1),
	__builtin_return_address (2));
*/



void __wait_on_buffer (struct buffer_head * bh);
struct buffer_head * getblk (int dev, unsigned long block, int size);
struct buffer_head * reiserfs_getblk (int dev, unsigned long block, int size, int *repeat);

struct buffer_head * find_buffer (int dev, unsigned long block, unsigned long size);
struct buffer_head * get_hash_table(dev_t dev, unsigned long block, int size);
struct buffer_head * bread (int dev, unsigned long block, size_t size);
struct buffer_head * reiserfs_bread (int dev, unsigned long block, int size, int *repeat);
int bwrite (struct buffer_head * bh);
void brelse (struct buffer_head * bh);
void bforget (struct buffer_head * bh);
void init_rollback_file (char * rollback_file, int *bloksize, FILE * log);
int open_rollback_file (char * rollback_file, FILE * log);
void close_rollback_file ();
void do_fsck_rollback (int fd_device, int fd_journal_device, FILE * log); 

void flush_buffers (int);
void free_buffers (void);
void invalidate_buffers (int);

#endif