From mboxrd@z Thu Jan  1 00:00:00 1970
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Date: Sun, 16 Oct 2011 09:19:10 -0400
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From: slash <slash.9fans@gmail.com>
To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net>
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Subject: Re: [9fans] ext2srv understands only 7bit ASCII file names?
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> unicode codepoints (runes) are abstract. =A0we need to deal with encoding=
s.
> the encoding utf-8 uses is not a single byte for anything above 0x7f.
> so essentially the encoding phase would be name[i] =3D (uchar)r. =A0the d=
ecoding phase
> would be r =3D (Rune)name[i].

Thank you. I modified trfs.c and wrote trfs.latin1 which does this.
Now I can do:

disk/partfs /dev/sdU7.0/data
disk/fdisk -p /dev/sdXX/data >/dev/sdXX/ctl
ext2srv -r -f /dev/sdXX/linux
trfs.latin1 /srv/ext2
mount /srv/trfs /n/ext2
cd /n/ext2
dircp . $home

and get no errors.