[Bug 299031] installation may create partition missing superblock

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=299031

--- Comment #4 from Jin Guojun <jguojun@gmail.com> ---
From both the 1.5TB drive case and 3GB a + 5 GB b case, it seems that some
alignment arithmetic used in computing the partition data.

In 1.5TB case, when slice 3 (s3) is configured as 256GB, gpart shows it is
224GB, and rest disk space for slice 4 (s4) will be 7xxGB, which is less than
the actual size.

This is probably why deleting the partition in S3 or S4 may fail because the
gpart may not be able to find the physical address.
The error should be "partition not found" instead of "device busy".

One suggestion: in partition menu, the newfs option should be added (restored)
as release 8.4 and earlier versions had.

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