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-rw-r--r--buf.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/buf.h b/buf.h
index f18fd87..0745be5 100644
--- a/buf.h
+++ b/buf.h
@@ -2,12 +2,12 @@ struct buf {
int flags;
uint dev;
uint blockno;
+ struct sleeplock lock;
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