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, 0 deletions

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