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#pragma once
#include "common/types.h"
#include "kernel/spinlock.h"
#define BSIZE 1024
#define NBUF 30
struct Buf
{
int valid; // Whether the data has been read from the disk (1=valid, 0=invalid)
int disk; // Whether it has been held by the driver (dirty bit/write-back flag is usually extended here)
uint32 dev; // Device Number
uint32 blockno; // Block number
uint32 refcnt; // Reference Counting
struct Buf *prev; // LRU linked list
struct Buf *next;
uchar data[BSIZE];
Mutex lock; // Sleep Lock
};
namespace BufferCache
{
void init();
struct Buf *bread(uint32 dev, uint32 blockno);
void bwrite(struct Buf *b);
void brelse(struct Buf *b);
void bpin(struct Buf *b);
void bunpin(struct Buf *b);
} // namespace BufferCache
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