- 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
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