2006-07-21 13:18:04 +00:00
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struct buf {
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int flags;
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2006-08-12 11:38:57 +00:00
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uint dev;
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uint sector;
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2007-08-24 19:32:36 +00:00
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struct buf *prev; // LRU cache list
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2006-08-12 22:34:13 +00:00
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struct buf *next;
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2007-08-24 19:32:36 +00:00
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struct buf *qnext; // disk queue
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int done;
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2006-07-21 13:18:04 +00:00
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uchar data[512];
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};
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2006-09-08 14:36:44 +00:00
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#define B_BUSY 0x1 // buffer is locked by some process
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#define B_VALID 0x2 // buffer contains the data of the sector
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2007-08-24 19:32:36 +00:00
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#define B_WRITE 0x4 // asking device driver to write, else read
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