xv6/buf.h

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struct buf {
int flags;
uint dev;
uint sector;
struct spinlock lock;
struct sleeplock sleeplock;
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struct buf *prev; // LRU cache list
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struct buf *next;
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struct buf *qnext; // disk queue
uchar data[512];
};
#define B_VALID 0x1 // buffer has been read from disk
#define B_DIRTY 0x2 // buffer needs to be written to disk