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/ide.c b/ide.c
index e41437e..4165831 100644
--- a/ide.c
+++ b/ide.c
@@ -127,7 +127,7 @@ iderw(struct buf *b)
 {
   struct buf **pp;
 
-  if(!acquired_sleeplock(&b->sleeplock))
+  if(!(b->flags & B_BUSY))
     panic("iderw: buf not busy");
   if((b->flags & (B_VALID|B_DIRTY)) == B_VALID)
     panic("iderw: nothing to do");