src/java.base/unix/classes/sun/nio/fs/UnixFileStore.java

*** 124,133 ****
--- 124,139 ----
         UnixFileStoreAttributes attrs = readAttributes();
         return attrs.blockSize() * attrs.availableBlocks();
      }
  
      @Override
+     public int getBlockSize() throws IOException {
+        UnixFileStoreAttributes attrs = readAttributes();
+        return (int)attrs.blockSize();
+     }
+ 
+     @Override
      public long getUnallocatedSpace() throws IOException {
          UnixFileStoreAttributes attrs = readAttributes();
          return attrs.blockSize() * attrs.freeBlocks();
      }