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struct buf {
int valid; // has data been read from disk?
int disk; // does disk "own" buf?
uint dev;
uint blockno;
struct sleeplock lock;
uint refcnt;
struct buf *prev; // LRU cache list
struct buf *next;
uchar data[BSIZE];
uint ticks; // derived from global variable ticks (trap.c), record ticks when last modified
};
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