linux-ext4 - Re: [PATCH 1/2] ext4: Handle casefolding with encryption

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Date:   Wed, 3 Feb 2021 11:31:28 -0500
From:   "Theodore Ts'o" <tytso@....edu>
To:     Andreas Dilger <adilger@...ger.ca>
Cc:     Daniel Rosenberg <drosen@...gle.com>,
        Eric Biggers <ebiggers@...nel.org>,
        Andreas Dilger <adilger.kernel@...ger.ca>,
        linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org,
        Gabriel Krisman Bertazi <krisman@...labora.com>,
        kernel-team@...roid.com, Paul Lawrence <paullawrence@...gle.com>
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
good.

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

Thanks,

					- Ted