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Fri, 08 Aug 2025 08:52:29 -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 821D4340237; Fri, 8 Aug 2025 09:52:28 -0600 (MDT) Received: by dev-csander.dev.purestorage.com (Postfix, from userid 1557716354) id 7C621E489B5; Fri, 8 Aug 2025 09:52:28 -0600 (MDT) From: Caleb Sander Mateos To: Ming Lei , Jens Axboe , Caleb Sander Mateos , Uday Shankar Cc: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] ublk: check for unprivileged daemon on each I/O fetch Date: Fri, 8 Aug 2025 09:52:15 -0600 Message-ID: <20250808155216.296170-1-csander@purestorage.com> X-Mailer: git-send-email 2.45.2 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" Commit ab03a61c6614 ("ublk: have a per-io daemon instead of a per-queue daemon") allowed each ublk I/O to have an independent daemon task. However, nr_privileged_daemon is only computed based on whether the last I/O fetched in each ublk queue has an unprivileged daemon task. Fix this by checking whether every fetched I/O's daemon is privileged. Change nr_privileged_daemon from a count of queues to a boolean indicating whether any I/Os have an unprivileged daemon. Signed-off-by: Caleb Sander Mateos Fixes: ab03a61c6614 ("ublk: have a per-io daemon instead of a per-queue dae= mon") Reviewed-by: Ming Lei --- drivers/block/ublk_drv.c | 16 +++++++--------- 1 file changed, 7 insertions(+), 9 deletions(-) diff --git a/drivers/block/ublk_drv.c b/drivers/block/ublk_drv.c index 6561d2a561fa..a035070dd690 100644 --- a/drivers/block/ublk_drv.c +++ b/drivers/block/ublk_drv.c @@ -233,11 +233,11 @@ struct ublk_device { =20 struct ublk_params params; =20 struct completion completion; unsigned int nr_queues_ready; - unsigned int nr_privileged_daemon; + bool unprivileged_daemons; struct mutex cancel_mutex; bool canceling; pid_t ublksrv_tgid; }; =20 @@ -1548,11 +1548,11 @@ static void ublk_reset_ch_dev(struct ublk_device *u= b) ublk_queue_reinit(ub, ublk_get_queue(ub, i)); =20 /* set to NULL, otherwise new tasks cannot mmap io_cmd_buf */ ub->mm =3D NULL; ub->nr_queues_ready =3D 0; - ub->nr_privileged_daemon =3D 0; + ub->unprivileged_daemons =3D false; ub->ublksrv_tgid =3D -1; } =20 static struct gendisk *ublk_get_disk(struct ublk_device *ub) { @@ -1978,16 +1978,14 @@ static void ublk_reset_io_flags(struct ublk_device = *ub) /* device can only be started after all IOs are ready */ static void ublk_mark_io_ready(struct ublk_device *ub, struct ublk_queue *= ubq) __must_hold(&ub->mutex) { ubq->nr_io_ready++; - if (ublk_queue_ready(ubq)) { + if (ublk_queue_ready(ubq)) ub->nr_queues_ready++; - - if (capable(CAP_SYS_ADMIN)) - ub->nr_privileged_daemon++; - } + if (!ub->unprivileged_daemons && !capable(CAP_SYS_ADMIN)) + ub->unprivileged_daemons =3D true; =20 if (ub->nr_queues_ready =3D=3D ub->dev_info.nr_hw_queues) { /* now we are ready for handling ublk io request */ ublk_reset_io_flags(ub); complete_all(&ub->completion); @@ -2878,12 +2876,12 @@ static int ublk_ctrl_start_dev(struct ublk_device *= ub, ub->dev_info.ublksrv_pid =3D ublksrv_pid; ub->ub_disk =3D disk; =20 ublk_apply_params(ub); =20 - /* don't probe partitions if any one ubq daemon is un-trusted */ - if (ub->nr_privileged_daemon !=3D ub->nr_queues_ready) + /* don't probe partitions if any daemon task is un-trusted */ + if (ub->unprivileged_daemons) set_bit(GD_SUPPRESS_PART_SCAN, &disk->state); =20 ublk_get_device(ub); ub->dev_info.state =3D UBLK_S_DEV_LIVE; =20 --=20 2.45.2