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Date: Sun, 14 Jan 2024 20:57:32 +0800
From: Zorro Lang <zlang@...hat.com>
To: Eric Biggers <ebiggers@...nel.org>
Cc: fstests@...r.kernel.org, linux-fscrypt@...r.kernel.org,
	linux-ext4@...r.kernel.org, linux-f2fs-devel@...ts.sourceforge.net,
	Daniel Rosenberg <drosen@...gle.com>
Subject: Re: [PATCH v2 4/4] generic: add test for custom crypto data unit size

On Tue, Nov 21, 2023 at 02:39:09PM -0800, Eric Biggers wrote:
> From: Eric Biggers <ebiggers@...gle.com>
> 
> Add a test that verifies the on-disk format of encrypted files that use
> a crypto data unit size that differs from the filesystem block size.
> This tests the functionality that was introduced in Linux 6.7 by kernel
> commit 5b1188847180 ("fscrypt: support crypto data unit size less than
> filesystem block size").
> 
> This depends on the xfsprogs patch
> "xfs_io/encrypt: support specifying crypto data unit size"
> (https://lore.kernel.org/r/20231013062639.141468-1-ebiggers@kernel.org)
> which adds the '-s' option to the set_encpolicy command of xfs_io.
> 
> As usual, the test skips itself when any prerequisite isn't met.
> 
> Signed-off-by: Eric Biggers <ebiggers@...gle.com>
> ---
>  tests/generic/900     | 29 +++++++++++++++++++++++++++++
>  tests/generic/900.out | 11 +++++++++++
>  2 files changed, 40 insertions(+)
>  create mode 100755 tests/generic/900
>  create mode 100644 tests/generic/900.out
> 
> diff --git a/tests/generic/900 b/tests/generic/900
> new file mode 100755
> index 00000000..8d1b5766
> --- /dev/null
> +++ b/tests/generic/900
> @@ -0,0 +1,29 @@
> +#! /bin/bash
> +# SPDX-License-Identifier: GPL-2.0
> +# Copyright 2023 Google LLC
> +#
> +# FS QA Test No. generic/900
> +#
> +# Verify the on-disk format of encrypted files that use a crypto data unit size
> +# that differs from the filesystem block size.  This tests the functionality
> +# that was introduced in Linux 6.7 by kernel commit 5b1188847180
> +# ("fscrypt: support crypto data unit size less than filesystem block size").

I'll write this part as:

  _wants_kernel_commit 5b1188847180
	"fscrypt: support crypto data unit size less than filesystem block size"

when I merge it.

> +#
> +. ./common/preamble
> +_begin_fstest auto quick encrypt
> +
> +. ./common/filter
> +. ./common/encrypt
> +
> +_supported_fs generic
> +
> +# For now, just test 512-byte and 1024-byte data units.  Filesystems accept
> +# power-of-2 sizes between 512 and the filesystem block size, inclusively.
> +# Testing 512 and 1024 ensures this test will run for any FS block size >= 1024
> +# (provided that the filesystem supports sub-block data units at all).
> +_verify_ciphertext_for_encryption_policy AES-256-XTS AES-256-CTS-CBC v2 log2_dusize=9

Oh, all _require_scratch_... things are in this helper. I was wondering
why it doesn't need to _require_scratch :)

This patchset looks good to me, tested passed on latest upstream kernel.
Thanks for this upgrade. Feel free to ping me, if your patchset be blocked
long time.

Reviewed-by: Zorro Lang <zlang@...hat.com>

> +_verify_ciphertext_for_encryption_policy AES-256-XTS AES-256-CTS-CBC v2 log2_dusize=10
> +
> +# success, all done
> +status=0
> +exit
> diff --git a/tests/generic/900.out b/tests/generic/900.out
> new file mode 100644
> index 00000000..3259f08c
> --- /dev/null
> +++ b/tests/generic/900.out
> @@ -0,0 +1,11 @@
> +QA output created by 900
> +
> +Verifying ciphertext with parameters:
> +	contents_encryption_mode: AES-256-XTS
> +	filenames_encryption_mode: AES-256-CTS-CBC
> +	options: v2 log2_dusize=9
> +
> +Verifying ciphertext with parameters:
> +	contents_encryption_mode: AES-256-XTS
> +	filenames_encryption_mode: AES-256-CTS-CBC
> +	options: v2 log2_dusize=10
> -- 
> 2.42.1
> 
> 


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