My desktop dual boots Gentoo Linux and FreeBSD. When I installed Gentoo at the time I decided on splitting certain directories in distinct partition, so the I created a partition strictly for portage and opted for the ReiserFS filesystem.

Today I wanted to cut down on the bandwith and decided to copy over a needed distfile from the ReiserFS partition to FreeBSD.

Bellow you’ll find the procedure to mount a ReiserFS in read-only mode. Do notice than the entire procedure is performed only on the FreeBSD system:

% man reiserfs
% su
# kldload reiserfs.ko
# mount -t reiserfs -o ro /dev/ad4s5 /mnt

Full post and explanation here

Source: linux-bsd-sharing.blogspot.com (29/01/2008)