buf.h

类unix x86平台的简单操作系统

struct buf {
  int flags;
  uint dev;
  uint sector;
  struct buf *prev;
  struct buf *next;
  uchar data[512];
};
#define B_BUSY 0x1  // buffer is locked by some process
#define B_VALID 0x2 // buffer contains the data of the sector