xv6-65oo2/buf.h
rtm 902b13f5d6 simplify ide queuing
nits in comments
2007-08-24 19:32:36 +00:00

14 lines
362 B
C

struct buf {
int flags;
uint dev;
uint sector;
struct buf *prev; // LRU cache list
struct buf *next;
struct buf *qnext; // disk queue
int done;
uchar data[512];
};
#define B_BUSY 0x1 // buffer is locked by some process
#define B_VALID 0x2 // buffer contains the data of the sector
#define B_WRITE 0x4 // asking device driver to write, else read