linux-kernel - Re: [PATCH] ublk: update UBLK_F_SUPPORT_ZERO

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Message-ID: <aFiw4eaajxKEOVa7@fedora>
Date: Mon, 23 Jun 2025 09:41:53 +0800
From: Ming Lei <ming.lei@...hat.com>
To: Caleb Sander Mateos <csander@...estorage.com>
Cc: linux-block@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ublk: update UBLK_F_SUPPORT_ZERO_COPY comment in UAPI
 header

On Sat, Jun 21, 2025 at 11:10:14AM -0600, Caleb Sander Mateos wrote:
> UBLK_F_SUPPORT_ZERO_COPY has a very old comment describing the initial
> idea for how zero-copy would be implemented. The actual implementation
> added in commit 1f6540e2aabb ("ublk: zc register/unregister bvec") uses
> io_uring registered buffers rather than shared memory mapping.
> Remove the inaccurate remarks about mapping ublk request memory into the
> ublk server's address space and requiring 4K block size. Replace them
> with a description of the current zero-copy mechanism.
> 
> Signed-off-by: Caleb Sander Mateos <csander@...estorage.com>

Reviewed-by: Ming Lei <ming.lei@...hat.com>

thanks,
Ming