It contains pointers to the second level structures which are called refcount
blocks and are exactly one cluster in size.
-Given a offset into the image file, the refcount of its cluster can be obtained
-as follows:
+Given an offset into the image file, the refcount of its cluster can be
+obtained as follows:
refcount_block_entries = (cluster_size * 8 / refcount_bits)
clusters, however it must be contiguous in the image file. L2 tables are
exactly one cluster in size.
-Given a offset into the virtual disk, the offset into the image file can be
+Given an offset into the virtual disk, the offset into the image file can be
obtained as follows:
l2_entries = (cluster_size / sizeof(uint64_t))