[DragonFlyBSD - Bug #3369] (New) installer fails to use entire disk: legacy BIOS, qemu, virtio_blk

[bugtracker-admin at leaf.dragonflybsd.org]

Issue #3369 has been reported by mikdusan.

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Bug #3369: installer fails to use entire disk: legacy BIOS, qemu, virtio_blk 
http://bugs.dragonflybsd.org/issues/3369

* Author: mikdusan
* Status: New
* Priority: Normal
* Category: installer
* Target version: 6.6
* Start date: 2024-05-25
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Install fails to use entire disk and sets size to 8063MB.

For example, create a qemu image of 20GB and install. The resulting system disk is ~8GB in size, underutilizing the full 20GB. This bug manifests when:
1. performing qemu guest install
2. guest configured to use virtio_blk for qemu img that is installation target
3. qemu img is new (all zeros) and has not yet been partitioned
4. dfly installer legacy BIOS is selected

Workaround: repeat the select-disk after formatting for first time
1. select: Install DragonFly BSD
2. select: Legacy BIOS
3. select: vbd0
4. select: Use Entire Disk
5. select: *RETURN TO SELECT DISK* (instead of selecting file system) to repeat steps 1...4

Reduction: use @fdisk@ to summarize the disk; the result must be as follows; specifically there must be no line beginning with @/dev/vbd0@ supplying disk geometry:
<pre>
fdisk -s vbd0
fdisk: invalid fdisk partition table found
fdisk: read_s0: Undefined error: 0
</pre>

Anti-Reduction: bug will *not* manifest if @fdisk@ shows any @/dev/vbd0@ disk geometry as follows:
<pre>
fdisk -s vbd0
...
/dev/vbd1: 41610 cyl 16 hd 63 sec
Part        Start        Size Type Flags
...
</pre>



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