Introduce and use sleeplocks instead of BUSY flags

Remove I_BUSY, B_BUSY, and intrans defs and usages
One spinlock per buf to avoid ugly loop in bget
fix race in filewrite (don't update f->off after releasing lock)

1 files changed, 1 insertions, 1 deletions

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