#ifndef INCLUDE_BUF_H
#define INCLUDE_BUF_H

struct buf {
    int        flags;
    uint       dev;
    uint       sector;
    struct buf *prev;  // LRU cache list
    struct buf *next;
    struct buf *qnext; // disk queue
    uchar      data[512];
};

#define B_BUSY  0x1  // buffer is locked by some process
#define B_VALID 0x2  // buffer has been read from disk
#define B_DIRTY 0x4  // buffer needs to be written to disk

#endif