Fixed up confusion caused by bad parameter names for
get_fs_limits(). Added missing conversion of
volume->vol_size from sectors to bytes. Fix up error
returns for unsupported tasks as EINVAL, not ENOSYS.
Use logical names for the API version numbers, since
the ABI is much more dependent on the headers. Add
code to byte-swap the superblock if necessary.
Pratt. Fixed a selection bug and added checks to make
sure volumes are not mounted when creating the list of
volumes which can be mkfs'ed by the ext2/3 plugin.