13 lines
362 B
C
13 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
|