summaryrefslogtreecommitdiff
path: root/buf.h
blob: f18fd87686e15a2a1abdf77eb10f5fa50145e10a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
struct buf {
  int flags;
  uint dev;
  uint blockno;
  struct buf *prev; // LRU cache list
  struct buf *next;
  struct buf *qnext; // disk queue
  uchar data[BSIZE];
};
#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