a (documented) way to get the Ext2+ filesystem size?

[Ivan Shmakov <ivan@gray.siamics.net>]

	How do I get the Ext2+ filesystem size (in blocks)?

	Currently, I do it like:

static uint_fast64_t
e2fs_size (ext2_filsys e2)
{
  uint_fast32_t hi
    = (uint_fast32_t)e2->super->s_blocks_count_hi;
  uint_fast32_t lo
    = (uint_fast32_t)e2->super->s_blocks_count;

  /* . */
  return (((uint64_t)hi << 32) | lo);
}

	However, it seems that there's no documentation for both the
	ext2_filsys and struct ext2_super_block structure types, and
	their respective member fields.

	Am I safe with the code above?

-- 
FSF associate member #7257