Update bitmap.rs

kcore-fs/src/bitmap.rs

@@ -29,6 +29,7 @@ impl Bitmap {
             blocks, // how many blocks used
         }
     }
+    
     pub fn alloc(&self, block_device: &Arc<dyn BlockDevice>) -> Option<usize> {
         for block_id in 0..self.blocks {
             let pos = get_block_cache(
@@ -57,6 +58,7 @@ impl Bitmap {
         }
         None
     }
+    
     pub fn dealloc(&self, block_device: &Arc<dyn BlockDevice>, bit: usize) {
         let (block_pos, bits64_pos, inner_pos) = decomposition(bit);
         get_block_cache(
@@ -67,6 +69,7 @@ impl Bitmap {
             bitmap_block[bits64_pos] -= 1u64 << inner_pos;
         });
     }
+    
      pub fn maximum(&self) -> usize {
         self.blocks * BLOCK_BITS
     }