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Date: Wed, 8 Jul 2026 11:57:30 -0600
From: Keith Busch <kbusch@kernel.org>
To: Mike Snitzer <snitzer@kernel.org>
Cc: axboe@kernel.dk, Mikulas Patocka <mpatocka@redhat.com>,
	Benjamin Marzinski <bmarzins@redhat.com>,
	Keith Busch <kbusch@meta.com>, dm-devel@lists.linux.dev,
	linux-block@vger.kernel.org,
	"Dr. David Alan Gilbert" <linux@treblig.org>,
	Vjaceslavs Klimovs <vklimovs@gmail.com>
Subject: Re: [PATCH 2/2] dm-raid1: don't fail the mirror for invalid I/O
 errors
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References: <20260616150554.1686662-1-kbusch@meta.com>
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 <0bd687cf-82ac-eacf-844b-c179a52dc72c@redhat.com>
 <akwVkSnXtyl6rBdh@kbusch-mbp>
 <ak1XNlyFC34W47iP@kernel.org>
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On Tue, Jul 07, 2026 at 03:44:54PM -0400, Mike Snitzer wrote:
> So where does dm-raid1 and dm-crypt stand relative to these DIO memory
> alignment changes?  Inferring they are pretty exposed.

dm-raid1 currently has a gap in handling badly behaved direct-io
applications. Worst case it may return success to a failed write command
that used to return an appropriate error before, so a silent corruption.
On reads, it can cause the array to be considered degraded when there's
nothing wrong with it.

There's no errors with dm-crypt today that I know of. I just want to
make it to be more aligned to the backing hardware.