Mercurial > hg > Members > mitsuki > xv6_rpi2_port

annotate uprogs/buf.h @ 0:ed10291ff195

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author mir3636
date Sun, 06 Jan 2019 19:27:03 +0900
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1 struct buf {
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2 int flags;
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3 uint dev;
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4 uint sector;
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5 struct buf *prev; // LRU cache list
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6 struct buf *next;
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7 struct buf *qnext; // disk queue
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8 uchar data[512];
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9 };
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10 #define B_BUSY 0x1 // buffer is locked by some process
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11 #define B_VALID 0x2 // buffer has been read from disk
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12 #define B_DIRTY 0x4 // buffer needs to be written to disk
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