Mercurial > hg > Members > mitsuki > xv6_rpi2_port

diff uprogs/buf.h @ 0:ed10291ff195

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author mir3636
date Sun, 06 Jan 2019 19:27:03 +0900
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--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/uprogs/buf.h	Sun Jan 06 19:27:03 2019 +0900
@@ -0,0 +1,13 @@
+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
+