Here's how to mount the jffs2 NAND:
mkdir/mnt/block2
mount -t jffs2 /dev/mtdblock2 /mnt/block2 -o ro
-o ro for read only. I haven't (yet) found a way of mounting the UBIFS from NAND, but I'm sure there is one. U-Boot might be helpful here too. (ie an amended bootcmd).