9.0-RC2 - bsdinstall miscount of remaining diskspace after partition deletion.

[Fbsd8]

nevtic at tx.net wrote:
> 
> If you are performating a manual partion in 9.0-RC2 bsdinstall and you 
> delete any created partition except the most recently created one, the 
> total remaining space will be miscalculated.  Reproducable as shown below.
> 
> Workaround:  if you delete a partition that is not the last partition 
> that was created, delete all partitions created after that partition 
> before continuing.  Order does not seem to be important.
> 
> The results are similar with other hard drive sizes, with the i386 or 
> amd64 distributions, and with either 9.0-RC2 or 9.0-RC1 (I did not go 
> back and check install discs prior to RC1)
> 
> Reproducing the miscount:
> 
> A 114 GB drive is used for this example:
> 
>   Select Manual Partitioning
> 
>   Perform the first Create on the drive and select GPT
> 
>   Creating the first partition:  "Add Partition" "size" shows 114GB
> 
>     Change size to 4GB, set mountpoint to  /  and tab to OK
>       (agree to the boot partition creation)
> 
>   Create a second partition: "Add Partition" "size" shows 110GB
> 
>     Adjust size to 10GB, set mountpoint to  /usr and tab to OK
> 
>   Create a third partition: "Add Partition" "size" shows 100GB
> 
>     Adjust size to 20GB, set mountpoint to /var, and tab to OK
> 
>   Create a 4th partition: "size" shows 80GB remaining
> 
>     Adjust size to 40GB, set mountpoint to /data,  and tab to OK.
> 
> There is 40 GB remaining on the drive.  Now change the size of /var.  
> First, delete the currently configured /var partition.
> 
> In the Partition Editor, adding up all the lines on the screen shows 
> 54GB (plus a 64K boot) as allocated, so there should now be 60GB 
> remaining.  But the deleted /var space has not been added back into the 
> total.
> 
> Select Create again: "Add Partition" "size" shows 40GB
> 
>    Adjust size to 30GB, set mountpoint as /var, tab to OK
> 
> A subsequent "Create" will show that 20GB is remaining, rather than the 
> actual remaining 30GB.  Selecting any size 20GB or larger for /home will 
> give you a 20GB partition, and then an additional create will show the 
> 10GB.
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> 
You should submit this as a pr.