Date: Wed, 02 Oct 2013 09:15:46 -0700 From: Sean Bruno <sean_bruno@yahoo.com> To: freebsd-fs@freebsd.org Subject: Endian issues, LE write to BE partitions Message-ID: <1380730546.1619.47.camel@localhost>
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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. =20
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:
=3D> 0 10442250 md0 VTOC8 (5.0G)
0 10442250 1 freebsd-ufs (5G) =20
dd to md0a from dev zero for just a bit
dd if=3D/dev/zero of=3D/dev/md0a bs=3D64k count=3D100
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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