diff --git a/inode.c b/inode.c
index e869ef3..17ab21d 100644
--- a/inode.c
+++ b/inode.c
@@ -603,8 +603,6 @@ static int simplefs_unlink(struct inode *dir, struct dentry *dentry)
     if (!bh)
         goto clean_inode;
     file_block = (struct simplefs_file_ei_block *) bh->b_data;
-    if (S_ISDIR(inode->i_mode))
-        goto scrub;
 
     for (ei = 0; ei < SIMPLEFS_MAX_EXTENTS; ei++) {
         char *block;
@@ -627,7 +625,6 @@ static int simplefs_unlink(struct inode *dir, struct dentry *dentry)
         }
     }
 
-scrub:
     /* Scrub index block */
     memset(file_block, 0, SIMPLEFS_BLOCK_SIZE);
     mark_buffer_dirty(bh);
diff --git a/script/test.sh b/script/test.sh
index 3803bf0..b479593 100755
--- a/script/test.sh
+++ b/script/test.sh
@@ -1,5 +1,7 @@
 #!/usr/bin/env bash
 
+. script/test_large_file.sh
+
 SIMPLEFS_MOD=simplefs.ko
 IMAGE=$1
 IMAGESIZE=$2
@@ -47,13 +49,6 @@ dd if=/dev/zero of=$IMAGE bs=1M count=$IMAGESIZE status=none && \
 sudo mount -t simplefs -o loop $IMAGE test && \
 pushd test >/dev/null
 
-# mkdir
-test_op 'mkdir dir'
-test_op 'mkdir dir' # expected to fail
-
-# create file
-test_op 'touch file'
-
 # create 40920 files
 for ((i=0; i<=$MAXFILES; i++))
 do
@@ -98,6 +93,21 @@ do
     fi
 done
 find . -name 'file_[0-9]*.txt' | xargs sudo rm || { echo "Failed to delete files"; exit 1; }
+sync
+
+popd >/dev/null || { echo "popd failed"; exit 1; }
+ls test -laR
+rm test/* -rf
+nr_free_blk=$(($(dd if=$IMAGE bs=1 skip=28 count=4 2>/dev/null | hexdump -v -e '1/4 "0x%08x\n"')))
+echo "$nr_free_blk"
+pushd test >/dev/null || { echo "pushd failed"; exit 1; }
+
+# mkdir
+test_op 'mkdir dir'
+test_op 'mkdir dir' # expected to fail
+
+# create file
+test_op 'touch file'
 
 # hard link
 test_op 'ln file hdlink'
@@ -119,21 +129,11 @@ test_op 'echo abc > file'
 test $(cat file) = "abc" || echo "Failed to write"
 
 # file too large
-test_op 'dd if=/dev/zero of=file bs=1M count=12 status=none'
-filesize=$(sudo ls -lR  | grep -e "$F_MOD 2".*file | awk '{print $5}')
-test $filesize -le $MAXFILESIZE || echo "Failed, file size over the limit"
+test_too_large_file
 
 # Write the file size larger than BLOCK_SIZE
 # test serial to write
-test_op 'printf \"%.0s123456789\" {1..1600} > file.txt'
-count=$(awk '{count += gsub(/123456789/, "")} END {print count}' "file.txt")
-echo "test $count"
-test "$count" -eq 1600 || echo "Failed, file size not matching"
-# test block to write
-test_op 'cat file.txt > checkfile.txt'
-count=$(awk '{count += gsub(/123456789/, "")} END {print count}' "checkfile.txt")
-echo "test $count"
-test "$count" -eq 1600 || echo "Failed, file size not matching"
+test_file_size_larger_than_block_size
 
 # test remove symbolic link
 test_op 'ln -s file symlink_fake'
@@ -152,7 +152,13 @@ check_exist $S_MOD 1 symlink
 check_exist $F_MOD 1 symlink_fake
 check_exist $F_MOD 1 symlink_hard_fake
 
+# clean all files and directories
+test_op 'rm -rf ./*'
+
 sleep 1
 popd >/dev/null
 sudo umount test
 sudo rmmod simplefs
+
+af_nr_free_blk=$(($(dd if=$IMAGE bs=1 skip=28 count=4 2>/dev/null | hexdump -v -e '1/4 "0x%08x\n"')))
+test $nr_free_blk -eq $af_nr_free_blk || echo "Failed, some blocks are not be reclaimed"
diff --git a/script/test_large_file.sh b/script/test_large_file.sh
new file mode 100755
index 0000000..7241c4d
--- /dev/null
+++ b/script/test_large_file.sh
@@ -0,0 +1,20 @@
+# file too large
+test_too_large_file() {
+    test_op 'dd if=/dev/zero of=file bs=1M count=12 status=none'
+    filesize=$(sudo ls -lR  | grep -e "$F_MOD 2".*file | awk '{print $5}')
+    test $filesize -le $MAXFILESIZE || echo "Failed, file size over the limit"
+}
+
+# Write the file size larger than BLOCK_SIZE
+# test serial to write
+test_file_size_larger_than_block_size() {
+    test_op 'yes 123456789 | head -n 1600 | tr -d "\n" > file.txt'
+    count=$(awk '{count += gsub(/123456789/, "")} END {print count}' "file.txt")
+    echo "test $count"
+    test "$count" -eq 1600 || echo "Failed, file size not matching"
+    # test block to write
+    test_op 'cat file.txt > checkfile.txt'
+    count=$(awk '{count += gsub(/123456789/, "")} END {print count}' "checkfile.txt")
+    echo "test $count"
+    test "$count" -eq 1600 || echo "Failed, file size not matching"
+}