Introduce and use sleeplocks instead of BUSY flags

Remove 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)

1 files changed, 1 insertions, 1 deletions

diff --git a/pipe.c b/pipe.c
index f76ed5c..bbac4dc 100644
--- a/pipe.c
+++ b/pipe.c
@@ -4,8 +4,8 @@
 #include "mmu.h"
 #include "proc.h"
 #include "fs.h"
-#include "file.h"
 #include "spinlock.h"
+#include "file.h"
 
 #define PIPESIZE 512