After reading the man page, you can see how unclear the names actually are...

My new suggestions:
```
fs_spec -> block_special_device
fs_file -> mount_point
fs_vfstype -> fs_type (or filesystem_type, but I think fs is a clear abbreviation for an otherwise very long word)
fs_mntopts -> mount_options
fs_freq -> needs_dump (or dumpable?)
fs_passno -> fsck_order
```