Working for ext4 support

I had gotten some requests to support brand-new ext4 filesystem from my backport d-i users. Yesterday I implemented it. Download via previous article.

The work was harder than I assumed...

• The implementation on d-i side was mostly done already on d-i trunk by cjwatson and otavio. I appreciate their good job! I merged it to partman-base and partman-ext3.
• Because GNU parted in Lenny didn't support ext4, I had to backport from unstable. Plus, I had to build again some packages to follow ABI change.
• e2fsprogs-udeb in Lenny didn't contain mkfs.ext4, though deb contained it. I backported from unstable for stability.
• grub won't work with ext4. You have to use grub-pc instead of it, if you'd like to use ext4 for root (boot) partition. I left this issue alone and just wrote down FAQ.
• Even you choose grub-pc, it won't boot because initramfs misrecognizes ext4 partition as ext3. You have to append "rootfstype=ext4" option to kernel parameter. I wrote it on FAQ.

i386/amd64 d-i images for Lenny, kernel version 2.6.30 + firmware + ext4 support

For those who would like to use Linux kernel 2.6.30 for installing Debian Lenny, here it is. Enjoy.

• Debian 5.0.1 Lenny based.
• Linux Kernel 2.6.30 (as same as Debian unstable)
• Support IDE disk again. (yes, I hadn't noticed ide-disk renamed to ide-gd_mod)
• pre-located firmware (linux-firmware package will be installed if d-i detects your machine needs it. This image supports bnx2 and bnx2x also)
• experimental WPA support (not tested)
• [update on 28 Jun] Added ext4 support. You can choose ext4 filesystem at partition manager screen. Don't try to use ext4 for your root partition (or see FAQ).

By the way,