From: Keith Busch <kbusch@kernel.org>
To: Mikulas Patocka <mpatocka@redhat.com>
Cc: Keith Busch <kbusch@meta.com>,
dm-devel@lists.linux.dev, linux-block@vger.kernel.org,
snitzer@kernel.org
Subject: Re: [RESEND PATCHv3 1/2] dm-crypt: allow unaligned bio_vecs for direct io
Date: Wed, 18 Mar 2026 12:35:05 -0600 [thread overview]
Message-ID: <abrwWQUm8-etR7gS@kbusch-mbp> (raw)
In-Reply-To: <fa0978af-398b-a212-73bc-80f0f2c375a4@redhat.com>
On Wed, Mar 18, 2026 at 07:06:40PM +0100, Mikulas Patocka wrote:
> > It doesn't matter what the underlying block device reports because
> > dm-crypt bounces the incoming plain text buffers to something aligned to
> > the backing device for the cypher text.
>
> dm-crypt bounces writes, but doesn't bounce reads. When doing reads, it
> reads the data into the target buffer and decompresses them in place.
Oh, thanks. It's been a while since I developed this, so I'll need a
moment double check for any mistaken assumptions. It may be I just used
backing devices that also had similar alignment constraints and missed
something.
next prev parent reply other threads:[~2026-03-18 18:35 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-16 15:02 [RESEND PATCHv3 1/2] dm-crypt: allow unaligned bio_vecs for direct io Keith Busch
2026-03-16 15:09 ` [RESEND PATCHv3 2/2] dm-crypt: dynamic scatterlist for many segments Keith Busch
2026-03-18 16:34 ` Mikulas Patocka
2026-03-18 17:01 ` Keith Busch
2026-03-18 17:40 ` Mikulas Patocka
2026-03-18 17:53 ` Keith Busch
2026-03-18 18:16 ` Mikulas Patocka
2026-03-18 18:32 ` Keith Busch
2026-03-18 18:41 ` Mikulas Patocka
2026-03-16 15:09 ` [RESEND PATCHv3 0/2] dm-crypt: support relaxed memory alignment Keith Busch
2026-03-18 16:19 ` [RESEND PATCHv3 1/2] dm-crypt: allow unaligned bio_vecs for direct io Mikulas Patocka
2026-03-18 17:40 ` Keith Busch
2026-03-18 18:06 ` Mikulas Patocka
2026-03-18 18:35 ` Keith Busch [this message]
2026-03-25 18:34 ` Keith Busch
-- strict thread matches above, loose matches on Subject: below --
2026-01-14 15:49 [RESEND PATCHv3 0/2] dm-crypt: support relaxed memory alignment Keith Busch
2026-01-14 15:49 ` [RESEND PATCHv3 1/2] dm-crypt: allow unaligned bio_vecs for direct io Keith Busch
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