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, 5 deletions

diff --git a/defs.h b/defs.h
index 0a55759..19d559b 100644
--- a/defs.h
+++ b/defs.h
@@ -5,7 +5,6 @@ struct inode;
 struct pipe;
 struct proc;
 struct spinlock;
-struct sleeplock;
 struct stat;
 struct superblock;
 
@@ -130,10 +129,6 @@ void            initlock(struct spinlock*, char*);
 void            release(struct spinlock*);
 void            pushcli(void);
 void            popcli(void);
-void            initsleeplock(struct sleeplock*);
-void            acquire_sleeplock(struct sleeplock*, struct spinlock*);
-void            release_sleeplock(struct sleeplock*);
-int             acquired_sleeplock(struct sleeplock*);
 
 // string.c
 int             memcmp(const void*, const void*, uint);