diff --git a/kernel/bio.c b/kernel/bio.c
index ede3a10..83f8ded 100644
--- a/kernel/bio.c
+++ b/kernel/bio.c
@@ -52,7 +52,7 @@ uint hasher(uint dev,uint blockno){
 int hash_get(uint dev,uint blockno){
   const uint hash_pos=hasher(dev, blockno);
   int pos=-1;
-  acquire(&bcache.hashlock[hash_pos]);
+  // acquire(&bcache.hashlock[hash_pos]);
   for(int cur=bcache.hash_head[hash_pos];cur!=-1;cur=bcache.nxt[cur])
     if(bcache.buf[cur].dev==dev && bcache.buf[cur].blockno==blockno){
       pos=cur;
@@ -61,17 +61,17 @@ int hash_get(uint dev,uint blockno){
   
   RET:
 
-  release(&bcache.hashlock[hash_pos]);
+  // release(&bcache.hashlock[hash_pos]);
   // printf("%u\n",pos);
   return pos;
 }
 
 void hash_add(uint dev,uint blockno,uint buf_pos){
   const uint hash_pos=hasher(dev, blockno);
-  acquire(&bcache.hashlock[hash_pos]);
+  // acquire(&bcache.hashlock[hash_pos]);
   bcache.nxt[buf_pos]=bcache.hash_head[hash_pos];
   bcache.hash_head[hash_pos]=buf_pos;
-  release(&bcache.hashlock[hash_pos]);
+  // release(&bcache.hashlock[hash_pos]);
 }
 
 void hash_del(uint dev,uint blockno){
@@ -157,6 +157,8 @@ bget(uint dev, uint blockno)
 {
   struct buf *b;
   // acquire(&bcache.lock);
+    const uint hash_pos=hasher(dev, blockno);
+  acquire(&bcache.hashlock[hash_pos]);
   const int pos=hash_get(dev, blockno);
   // Is the block already cached?
   // for(b = bcache.head.next; b != &bcache.head; b = b->next){
@@ -169,8 +171,7 @@ bget(uint dev, uint blockno)
   // }
   if(pos>=0){
     b=&bcache.buf[pos];
-    const uint hash_pos=hasher(dev, blockno);
-    acquire(&bcache.hashlock[hash_pos]);
+    // acquire(&bcache.hashlock[hash_pos]);
     ++bcache.buf[pos].refcnt;
     release(&bcache.hashlock[hash_pos]);
     acquiresleep(&b->lock);
@@ -214,6 +215,7 @@ bget(uint dev, uint blockno)
     const int ori=bcache.freelist_head[i];
     bcache.freelist_head[i]=bcache.nxt[bcache.freelist_head[i]];
     hash_add(dev,blockno,ori);
+    release(&bcache.hashlock[hash_pos]);    
     b->dev=dev;
     b->blockno=blockno;
     b->valid=0;
diff --git a/kernel/fs.c b/kernel/fs.c
index 7200462..8761d3c 100644
--- a/kernel/fs.c
+++ b/kernel/fs.c
@@ -93,8 +93,8 @@ bfree(int dev, uint b)
 {
   struct buf *bp;
   int bi, m;
-  DEBUG();
-  printf("%d %d\n",dev,b);
+  // DEBUG();
+  // printf("%d %d\n",dev,b);
   bp = bread(dev, BBLOCK(b, sb));
   bi = b % BPB;
   m = 1 << (bi % 8);