d0f7acf9eb
An x86-64 operating system built from xv6, now largely rewritten: SMP, a copy-on-write root filesystem (SchFS), PCI/USB/virtio drivers, a TTF rasteriser, and a Linux-numbered syscall ABI. No history before this point -- the tree was never under version control. This commit exists so the rename that follows has something to undo to.
14 lines
326 B
C
14 lines
326 B
C
struct buf {
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int flags;
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uint dev;
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uint blockno;
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struct sleeplock lock;
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uint refcnt;
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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
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uchar data[BSIZE];
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};
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#define B_VALID 0x2 // buffer has been read from disk
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#define B_DIRTY 0x4 // buffer needs to be written to disk
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