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, 0 insertions, 1 deletions

diff --git a/sysfile.c b/sysfile.c
index 11895df..c9d3594 100644
--- a/sysfile.c
+++ b/sysfile.c
@@ -5,7 +5,6 @@
 #include "mmu.h"
 #include "proc.h"
 #include "fs.h"
-#include "spinlock.h"
 #include "file.h"
 #include "fcntl.h"