linux-kernel - Re: [PATCH 11/20] ublk: move offset check out of __ublk_check_and_get

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Message-ID: <aU3v1qBBRmDAcNzl@fedora>
Date: Fri, 26 Dec 2025 10:15:50 +0800
From: Ming Lei <ming.lei@...hat.com>
To: Caleb Sander Mateos <csander@...estorage.com>
Cc: Jens Axboe <axboe@...nel.dk>, Shuah Khan <shuah@...nel.org>,
	linux-block@...r.kernel.org, linux-kselftest@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Stanley Zhang <stazhang@...estorage.com>,
	Uday Shankar <ushankar@...estorage.com>
Subject: Re: [PATCH 11/20] ublk: move offset check out of
 __ublk_check_and_get_req()

On Tue, Dec 16, 2025 at 10:34:45PM -0700, Caleb Sander Mateos wrote:
> __ublk_check_and_get_req() checks that the passed in offset is within
> the data length of the specified ublk request. However, only user copy
> (ublk_check_and_get_req()) supports accessing ublk request data at a
> nonzero offset. Zero-copy buffer registration (ublk_register_io_buf())
> always passes 0 for the offset, so the check is unnecessary. Move the
> check from __ublk_check_and_get_req() to ublk_check_and_get_req().
> 
> Signed-off-by: Caleb Sander Mateos <csander@...estorage.com>

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


Thanks,
Ming