linux-ext4 - Re: Why isn't ext2 deprecated over ext4?

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Message-ID: <20240221211136.GA633176@mit.edu>
Date: Wed, 21 Feb 2024 16:11:36 -0500
From: "Theodore Ts'o" <tytso@....edu>
To: Jan Kara <jack@...e.cz>
Cc: Michael Opdenacker <michael.opdenacker@...tlin.com>,
        linux-ext4@...r.kernel.org
Subject: Re: Why isn't ext2 deprecated over ext4?

On Wed, Feb 21, 2024 at 05:58:05PM +0100, Jan Kara wrote:
> Hum, so I didn't quite think through my comment about on disk format :).
> When you create filesystem with larger inodes, mke2fs will indeed create
> inodes with extra timestamp fields etc. ext4 driver will recognize them
> and use them, however ext2 driver happily ignores them (I thought we refuse
> to mount such filesystem but we don't because of the way how large inodes
> were defined in the ondisk format).

Well, if we *cared* we could backport the support for the expanded
timestamps to ext2.  I'm not sure it's worth the effort, but it's not
that hard....

					- Ted