[Bug 232845] Better support for MBR partition requested in FreeBSD installer

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=232845

            Bug ID: 232845
           Summary: Better support for MBR partition requested in FreeBSD
                    installer
           Product: Base System
           Version: 10.4-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: bourne.identity at hotmail.com

I think there is a problem with the FreeBSD installer which can only be sorted
out by reworking its opening stages.

For MBR users, FreeBSD installer enforces a mandatory slice which has to be
nested containing at least one partition (for /). 

This is wrong. Let's say the user wants to install FreeBSD on ada0s3.

The user should instead be getting prompted :

a) Do you want to set up a FreeBSD slice in the chosen primary partition ? Or,
b) Do you want to the entire chosen primary partition to serve as / ?

In case of a), the installer should work as it currently does already - setting
up / (UFS) on ada0s3a.

In case of b), the installer should set up / (UFS) on ada0s3 (not ada0s3a).

In case of b), if the user needs any extra filesystems, those can be found in
the EBR, just as with Linux. Generally, FreeBSD should move away from the BSD
nesting schema in the coming times, offering it only as an option. I would like
UFS to work under MBR just as it does under GPT - unnested.

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