-dumponeblock(ext2_filsys fs, blk_t *blocknr, e2_blkcnt_t blockcnt,
- blk_t ref_block, int ref_offset, void * private)
+dumponeblock(UNUSED(ext2_filsys fs), blk_t *blocknr, e2_blkcnt_t blockcnt,
+ UNUSED(blk_t ref_block), UNUSED(int ref_offset), void * private)