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Date:   Tue, 17 Nov 2020 18:51:02 -0800
From:   Eric Biggers <ebiggers@...nel.org>
To:     Satya Tangirala <satyat@...gle.com>
Cc:     "Theodore Y . Ts'o" <tytso@....edu>,
        Jaegeuk Kim <jaegeuk@...nel.org>, Chao Yu <chao@...nel.org>,
        Jens Axboe <axboe@...nel.dk>,
        "Darrick J . Wong" <darrick.wong@...cle.com>,
        linux-kernel@...r.kernel.org, linux-fscrypt@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net, linux-xfs@...r.kernel.org,
        linux-block@...r.kernel.org, linux-ext4@...r.kernel.org
Subject: Re: [PATCH v7 0/8] add support for direct I/O with fscrypt using
 blk-crypto

On Tue, Nov 17, 2020 at 02:07:00PM +0000, Satya Tangirala wrote:
> This patch series was tested by running xfstests with test_dummy_encryption
> with and without the 'inlinecrypt' mount option, and there were no
> meaningful regressions. One regression was for generic/587 on ext4,
> but that test isn't compatible with test_dummy_encryption in the first
> place, and the test "incorrectly" passes without the 'inlinecrypt' mount
> option - a patch will be sent out to exclude that test when
> test_dummy_encryption is turned on with ext4 (like the other quota related
> tests that use user visible quota files).

It would be helpful to have some more testing results that show that the direct
I/O support is really working as intended, especially in the new case where
logical_block_size < data_unit_size and buffers are only logical_block_size
aligned --- both with real hardware and with blk-crypto-fallback.  Using my
patchset https://lkml.kernel.org/r/20201112194011.103774-1-ebiggers@kernel.org
it should be possible to test with real eMMC inline encryption hardware on
Snapdragon 630; it has logical_block_size=512.

Also note, generic/587 was already added to the ext4/encrypt and ext4/encrypt_1k
exclusion lists by xfstests-bld commit 02e4bfe628b4.

- Eric

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