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Date:   Wed, 30 Dec 2020 10:01:56 -0800
From:   Eric Biggers <>
To:     Sasha Levin <>
        Jaegeuk Kim <>,,
        Daniel Rosenberg <>
Subject: Re: [f2fs-dev] [PATCH AUTOSEL 5.10 10/31] f2fs: Handle casefolding
 with Encryption

On Wed, Dec 30, 2020 at 08:02:52AM -0500, Sasha Levin wrote:
> From: Daniel Rosenberg <>
> [ Upstream commit 7ad08a58bf67594057362e45cbddd3e27e53e557 ]
> Expand f2fs's casefolding support to include encrypted directories.  To
> index casefolded+encrypted directories, we use the SipHash of the
> casefolded name, keyed by a key derived from the directory's fscrypt
> master key.  This ensures that the dirhash doesn't leak information
> about the plaintext filenames.
> Encryption keys are unavailable during roll-forward recovery, so we
> can't compute the dirhash when recovering a new dentry in an encrypted +
> casefolded directory.  To avoid having to force a checkpoint when a new
> file is fsync'ed, store the dirhash on-disk appended to i_name.
> This patch incorporates work by Eric Biggers <>
> and Jaegeuk Kim <>.
> Co-developed-by: Eric Biggers <>
> Signed-off-by: Eric Biggers <>
> Signed-off-by: Daniel Rosenberg <>
> Reviewed-by: Eric Biggers <>
> Signed-off-by: Jaegeuk Kim <>
> Signed-off-by: Sasha Levin <>

Please don't backport this to the LTS kernels.  This is a new feature, not a
fix, and you missed prerequisite patches...

- Eric

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