Revert "Introduce and use sleeplocks instead of BUSY flags"

My changes have a race with re-used bufs and the code doesn't seem to get shorter
Keep the changes that fixed ip->off race

This reverts commit 3a5fa7ed9020eaf8ab843a16d26db7393b2ec072.

Conflicts:

	defs.h
	file.c
	file.h

1 files changed, 1 insertions, 1 deletions

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