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#define SECTOR_BITS 9
#define BUFFER_STATE_INVAL 0
#define BUFFER_STATE_CLEAN 1
#define BUFFER_STATE_DIRTY 2
#define BUFFER_STATE_MASK 3
#define BUFFER_BUCKETS 9999
typedef unsigned long long sector_t;
typedef unsigned long long offset_t;
struct buffer
{
struct buffer *hashlist;
struct list_head list;
unsigned count; // should be atomic_t
unsigned flags;
unsigned size;
sector_t sector;
unsigned char *data;
unsigned fd;
};
struct list_head dirty_buffers;
extern unsigned dirty_buffer_count;
void show_dirty_buffers(void);
void set_buffer_dirty(struct buffer *buffer);
void set_buffer_uptodate(struct buffer *buffer);
void brelse(struct buffer *buffer);
void brelse_dirty(struct buffer *buffer);
int write_buffer_to(struct buffer *buffer, offset_t pos);
int write_buffer(struct buffer *buffer);
int read_buffer(struct buffer *buffer);
unsigned buffer_hash(sector_t sector);
struct buffer *new_buffer(sector_t sector, unsigned size);
struct buffer *getblk(unsigned fd, sector_t sector, unsigned size);
struct buffer *bread(unsigned fd, sector_t sector, unsigned size);
void evict_buffer(struct buffer *buffer);
void evict_buffers(void);
void flush_buffers(void);
void show_buffer(struct buffer *buffer);
void show_active_buffers(void);
void show_buffers(void);
void init_buffers(void);
static inline int buffer_dirty(struct buffer *buffer)
{
return (buffer->flags & BUFFER_STATE_MASK) == BUFFER_STATE_DIRTY;
}
static inline int buffer_uptodate(struct buffer *buffer)
{
return (buffer->flags & BUFFER_STATE_MASK) == BUFFER_STATE_CLEAN;
}
static inline void *malloc_aligned(size_t size, unsigned binalign)
{
unsigned long p = (unsigned long)malloc(size + binalign - 1);
return (void *)(p + (-p & (binalign - 1)));
}

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