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/file.c b/file.c
index df90e07..f28365e 100644
--- a/file.c
+++ b/file.c
@@ -2,8 +2,8 @@
 #include "defs.h"
 #include "param.h"
 #include "fs.h"
-#include "spinlock.h"
 #include "file.h"
+#include "spinlock.h"
 
 struct devsw devsw[NDEV];
 struct {