ext2/ext3 still under active maintenance?

["John Anthony Kazos Jr." <jakj@xxxxxxxxxxx>]

I'm trying to look at the ext2/ext3 source for learning Linux FS 
development. I'm avoiding ext4 for now because it's under active 
development and it's too much to chew before I understand the previous 
versions. But am I going to get an outdated view of the right way to 
program filesystems if I look at those, or is the code just as shiny as 
ext4's?
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