squashfs 4.0 on Debian Lenny and 2.6.30 kernel

Recently, I started 2.6.30 kernel development on Voyage Linux. When reviewing 2.6.30 changes, I found that squashfs is now included in vanilla kernel. So I am very pleased to use the built-in squashfs module instead of out of tree module.

One notable thing of the in-kernel squashfs module is with a newer version 4.0 than version 3.3 provided in Lenny and/or Voyage Linux 0.6.2. Running re-built Voyage Linux Live CD with a 2.6.30 kernel, squashfs filesystem cannot be mount as the same time I was surprisingly to know that squashfs 4.0 module is incompatible to 3.x squashfs filesystem. That's why the mount failure comes out.

I have no choice but have to rebuilt squashfs-tools package from squeeze/sid. I download and rebuild the package on Lenny by:

# dget http://ftp.de.debian.org/debian/pool/main/s/squashfs/squashfs_4.0-1.dsc
# (however, it complains key-ring not found, so use dpkg-source)
# dpkg-source -x squashfs_4.0-1.dsc
# cd squashfs-4.0
# debuild

Then, upload the built package to Voyage Linux experimental repository. Rebuild the Live CD, and everything works again.