linux-ext4 - Re: [PATCH v3 2/5] ext4: only allow test_dummy

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Message-ID: <YoWnN/qY30ly9znS@mit.edu>
Date:   Wed, 18 May 2022 22:11:03 -0400
From:   "Theodore Ts'o" <tytso@....edu>
To:     Eric Biggers <ebiggers@...nel.org>
Cc:     linux-fscrypt@...r.kernel.org, linux-ext4@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net,
        Jeff Layton <jlayton@...nel.org>,
        Lukas Czerner <lczerner@...hat.com>,
        Jaegeuk Kim <jaegeuk@...nel.org>
Subject: Re: [PATCH v3 2/5] ext4: only allow test_dummy_encryption when
 supported

On Fri, May 13, 2022 at 04:16:02PM -0700, Eric Biggers wrote:
> From: Eric Biggers <ebiggers@...gle.com>
> 
> Make the test_dummy_encryption mount option require that the encrypt
> feature flag be already enabled on the filesystem, rather than
> automatically enabling it.  Practically, this means that "-O encrypt"
> will need to be included in MKFS_OPTIONS when running xfstests with the
> test_dummy_encryption mount option.  (ext4/053 also needs an update.)
> 
> Moreover, as long as the preconditions for test_dummy_encryption are
> being tightened anyway, take the opportunity to start rejecting it when
> !CONFIG_FS_ENCRYPTION rather than ignoring it.
> 
> The motivation for requiring the encrypt feature flag is that:
> 
> - Having the filesystem auto-enable feature flags is problematic, as it
>   bypasses the usual sanity checks.  The specific issue which came up
>   recently is that in kernel versions where ext4 supports casefold but
>   not encrypt+casefold (v5.1 through v5.10), the kernel will happily add
>   the encrypt flag to a filesystem that has the casefold flag, making it
>   unmountable -- but only for subsequent mounts, not the initial one.
>   This confused the casefold support detection in xfstests, causing
>   generic/556 to fail rather than be skipped.
> 
> - The xfstests-bld test runners (kvm-xfstests et al.) already use the
>   required mkfs flag, so they will not be affected by this change.  Only
>   users of test_dummy_encryption alone will be affected.  But, this
>   option has always been for testing only, so it should be fine to
>   require that the few users of this option update their test scripts.
> 
> - f2fs already requires it (for its equivalent feature flag).
> 
> Signed-off-by: Eric Biggers <ebiggers@...gle.com>

Thanks, applied.

					- Ted