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struct buf {
int flags;
uint dev;
uint sector;
struct buf *prev; // LRU cache list
struct buf *next;
struct buf *qnext; // disk queue
int done;
uchar data[512];
};
#define B_BUSY 0x1 // buffer is locked by some process
#define B_VALID 0x2 // buffer contains the data of the sector
#define B_WRITE 0x4 // asking device driver to write, else read
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