linux-ext4 - Re: [PATCH v4 4/4] ext4: add inline encryption support

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Message-ID: <20200708171812.GF1627842@mit.edu>
Date:   Wed, 8 Jul 2020 13:18:12 -0400
From:   tytso@....edu
To:     Satya Tangirala <satyat@...gle.com>
Cc:     linux-fscrypt@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net, linux-ext4@...r.kernel.org,
        Eric Biggers <ebiggers@...gle.com>
Subject: Re: [PATCH v4 4/4] ext4: add inline encryption support

On Thu, Jul 02, 2020 at 01:56:07AM +0000, Satya Tangirala wrote:
> From: Eric Biggers <ebiggers@...gle.com>
> 
> Wire up ext4 to support inline encryption via the helper functions which
> fs/crypto/ now provides.  This includes:
> 
> - Adding a mount option 'inlinecrypt' which enables inline encryption
>   on encrypted files where it can be used.
> 
> - Setting the bio_crypt_ctx on bios that will be submitted to an
>   inline-encrypted file.
> 
>   Note: submit_bh_wbc() in fs/buffer.c also needed to be patched for
>   this part, since ext4 sometimes uses ll_rw_block() on file data.
> 
> - Not adding logically discontiguous data to bios that will be submitted
>   to an inline-encrypted file.
> 
> - Not doing filesystem-layer crypto on inline-encrypted files.
> 
> Signed-off-by: Eric Biggers <ebiggers@...gle.com>
> Co-developed-by: Satya Tangirala <satyat@...gle.com>
> Signed-off-by: Satya Tangirala <satyat@...gle.com>

Reviewed-by: Theodore Ts'o <tytso@....edu>