No space left on device error while creating and immediately deleting files using redoxfs via libfuse in linux

Im using redoxfs via libfuse under linux. To mount redoxfs , i use make mount command. I only changed the size of disk to bs=4096 count=400.

I used a script to continuously create and delete files in the image/ directory, creating a file and then immediately deleting it. After looping like this for over 100 times, an error occurred.

Here's my script:

# ./create_and_delete_files.sh 
for i in {1..100}
do
  touch "file_$i.txt"  
  rm "file_$i.txt"    
done
echo "Completed creating and deleting 100 files."

And the image i uploaded is the error message saying that theres no space left on the disk. Which is wierd.

I also tried to use redoxfs on a toyos im currently working on. And i found that on my toyos, after each create and delete operation(i called create_node once and remove_node once), the result obtained from calling the allocator's free function is always one less than before performing the operation.