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, 6 deletions

diff --git a/spinlock.h b/spinlock.h
index f6a69b7..fdda016 100644
--- a/spinlock.h
+++ b/spinlock.h
@@ -1,4 +1,4 @@
-// Mutual exclusion lock for short code fragments
+// Mutual exclusion lock.
 struct spinlock {
   uint locked;       // Is the lock held?
   
@@ -9,8 +9,3 @@ struct spinlock {
                      // that locked the lock.
 };
 
-// Lock that maybe held across sleeps
-struct sleeplock {
-  uint locked;       // Is the lock held?
-};
-