Using makefs from an amd64 host to build a f/s in a VTOC8 partition will destroy the entire partition table. I simplified the test to simple dd to an existing partition and got the same result, exonerating mkfs
I suspect a lack of endian knowledge in geom itself, not
geom_part_vtoc8.
test case:
using amd64 host (10.0 current) create monolothic image
truncate -s+5G /var/tmp/myfile.img
mdconfig -f /var/tmp/myfile.img
build and load geom_part_vtoc8 kernel module
use gpart to create VTOC8 part table
add partition to part table to yeild the following:
=> 0 10442250 md0 VTOC8 (5.0G)
0 10442250 1 freebsd-ufs (5G)
dd to md0a from dev zero for just a bit
dd if=/dev/zero of=/dev/md0a bs=64k count=100
destroy md0 via mdconfig -d -u 0
recreate it with mdconfig -f /var/tmp/myfile.img
gpart displays no partions for the image any more:
gpart: No such geom: md0.
bcc freebsd-geom
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