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Date:   Wed, 3 Feb 2021 11:31:28 -0500
From:   "Theodore Ts'o" <>
To:     Andreas Dilger <>
Cc:     Daniel Rosenberg <>,
        Eric Biggers <>,
        Andreas Dilger <>,,,,
        Gabriel Krisman Bertazi <>,, Paul Lawrence <>
Subject: Re: [PATCH 1/2] ext4: Handle casefolding with encryption

On Wed, Feb 03, 2021 at 03:55:06AM -0700, Andreas Dilger wrote:
> It looks like this change will break the dirdata feature, which is similarly
> storing a data field beyond the end of the dirent. However, that feature also
> provides for flags stored in the high bits of the type field to indicate
> which of the fields are in use there.
> The first byte of each field stores
> the length, so it can be skipped even if the content is not understood.

Daniel, for context, the dirdata field is an out-of-tree feature which
is used by Lustre, and so has fairly large deployed base.  So if there
is a way that we can accomodate not breaking dirdata, that would be

Did the ext4 casefold+encryption implementation escape out to any
Android handsets?


					- Ted

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