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Wed, 17 Sep 2025 18:50:37 -0700 (PDT) X-Relaying-Domain: purestorage.com Received: from dev-csander.dev.purestorage.com (unknown [IPv6:2620:125:9007:640:ffff::1199]) by c7-smtp-2023.dev.purestorage.com (Postfix) with ESMTP id 60D77340325; Wed, 17 Sep 2025 19:50:36 -0600 (MDT) Received: by dev-csander.dev.purestorage.com (Postfix, from userid 1557716354) id 5BF28E41B42; Wed, 17 Sep 2025 19:50:36 -0600 (MDT) From: Caleb Sander Mateos To: Ming Lei , Jens Axboe Cc: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, Caleb Sander Mateos Subject: [PATCH 06/17] ublk: don't dereference ublk_queue in ublk_check_and_get_req() Date: Wed, 17 Sep 2025 19:49:42 -0600 Message-ID: <20250918014953.297897-7-csander@purestorage.com> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20250918014953.297897-1-csander@purestorage.com> References: <20250918014953.297897-1-csander@purestorage.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" For ublk servers with many ublk queues, accessing the ublk_queue in ublk_ch_{read,write}_iter() is a frequent cache miss. Get the flags and queue depth from the ublk_device instead, which is accessed just before. Signed-off-by: Caleb Sander Mateos --- drivers/block/ublk_drv.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/block/ublk_drv.c b/drivers/block/ublk_drv.c index 58f688eac742..d6d8dcb72e4b 100644 --- a/drivers/block/ublk_drv.c +++ b/drivers/block/ublk_drv.c @@ -2525,14 +2525,14 @@ static struct request *ublk_check_and_get_req(struc= t kiocb *iocb, =20 if (q_id >=3D ub->dev_info.nr_hw_queues) return ERR_PTR(-EINVAL); =20 ubq =3D ublk_get_queue(ub, q_id); - if (!ublk_support_user_copy(ubq)) + if (!ublk_dev_support_user_copy(ub)) return ERR_PTR(-EACCES); =20 - if (tag >=3D ubq->q_depth) + if (tag >=3D ub->dev_info.queue_depth) return ERR_PTR(-EINVAL); =20 *io =3D &ubq->ios[tag]; req =3D __ublk_check_and_get_req(ub, ubq, *io, buf_off); if (!req) --=20 2.45.2