1 files changed, 4 insertions, 5 deletions
diff --git a/kernel/fs.c b/kernel/fs.c
index c6bab15..6c4079e 100644
--- a/kernel/fs.c
+++ b/kernel/fs.c
@@ -295,11 +295,11 @@ ilock(struct inode *ip)
   struct buf *bp;
   struct dinode *dip;
 
-  if(ip == 0 || ip->ref < 1)
+  if(ip == 0 || atomic_read4(&ip->ref) < 1)
     panic("ilock");
 
   acquiresleep(&ip->lock);
-
+  
   if(ip->valid == 0){
     bp = bread(ip->dev, IBLOCK(ip->inum, sb));
     dip = (struct dinode*)bp->data + ip->inum%IPB;
@@ -320,7 +320,7 @@ ilock(struct inode *ip)
 void
 iunlock(struct inode *ip)
 {
-  if(ip == 0 || !holdingsleep(&ip->lock) || ip->ref < 1)
+  if(ip == 0 || !holdingsleep(&ip->lock) || atomic_read4(&ip->ref) < 1)
     panic("iunlock");
 
   releasesleep(&ip->lock);
@@ -416,7 +416,6 @@ bmap(struct inode *ip, uint bn)
     brelse(bp);
     return addr;
   }
-
   panic("bmap: out of range");
 }
 
@@ -447,7 +446,7 @@ itrunc(struct inode *ip)
     bfree(ip->dev, ip->addrs[NDIRECT]);
     ip->addrs[NDIRECT] = 0;
   }
-
+  
   ip->size = 0;
   iupdate(ip);
 }