EXT4_BLOCK_SIZE   254 fs/ext4/ext4.h # define EXT4_BLOCK_SIZE(s)		((s)->s_blocksize)
EXT4_BLOCK_SIZE   256 fs/ext4/ext4.h # define EXT4_BLOCK_SIZE(s)		(EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)