[davilla]

Linux can mount a HFS+ journaled disk. The trick is to make sure the journal is empty (clean unmount on the OSX side) and to force the mount. Normally Linux will mount it read-only. You force it by doing this;

mount -t hfsplus -o rw,force /dev/sdx1 dst

This trick is used all the time with atv-bootloader to gain access to the AppleTV HFS+ journaled partitions.