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How would I implement the ext4 filesystem in my OS? The only detailed article on the wiki concerning ext is ext2.

Thanks

Thanks!

Where is the superblock located on the harddisk?

(I know this is probably a better question for a Linux forum, but I'll ask it here anyway.)

Is there an all-in-one doc containing all the specifications of ext4?

Also, I cannot find documentation on XFS, JFS, BTRFS, UFS, or ZFS . . .

PavelCheckov wrote:Is there an all-in-one doc containing all the specifications of ext4?

This is the closest you're going to get.

PavelCheckov wrote:Also, I cannot find documentation on XFS, JFS, BTRFS, UFS, or ZFS . . .

You're not looking very hard.

Allow me to be more specific: I cannot find any up-to-date documentation from the original site, and not from some unknown webpage on the corner of the web, which has a scan of it.

Few FSes have formal specs (though counterexamples such as FAT exist). For most FSes that are originally implemented for Linux, the source is the most reliable documentation.