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Frans Kaashoek authoredRemove I_BUSY, B_BUSY, and intrans defs and usages One spinlock per buf to avoid ugly loop in bget fix race in filewrite (don't update f->off after releasing lock)
3a5fa7ed
buf.h 337 B
struct buf {
int flags;
uint dev;
uint sector;
struct spinlock lock;
struct sleeplock sleeplock;
struct buf *prev; // LRU cache list
struct buf *next;
struct buf *qnext; // disk queue
uchar data[512];
};
#define B_VALID 0x1 // buffer has been read from disk
#define B_DIRTY 0x2 // buffer needs to be written to disk