From: Damien Le Moal <Damien.LeMoal@wdc.com>
To: Christoph Hellwig <hch@lst.de>,
"linux-nvme@lists.infradead.org" <linux-nvme@lists.infradead.org>
Cc: Keith Busch <kbusch@kernel.org>, Jens Axboe <axboe@kernel.dk>,
Sagi Grimberg <sagi@grimberg.me>
Subject: Re: [PATCH 15/20] nvme: remove nvme_update_formats
Date: Mon, 28 Sep 2020 15:02:48 +0000 [thread overview]
Message-ID: <CY4PR04MB3751105F9967301E5670C5C6E7350@CY4PR04MB3751.namprd04.prod.outlook.com> (raw)
In-Reply-To: 20200928123502.435373-16-hch@lst.de
On 2020/09/28 21:35, Christoph Hellwig wrote:
> Now that the queue is frozen before updating ->lba_shift we can't hit the
> invalid references mentioned in the comment any more. More importantly
> this code would not have helped us if the format was changed by another
> controller or through implementation defined back channels.
>
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
> drivers/nvme/host/core.c | 32 ++------------------------------
> 1 file changed, 2 insertions(+), 30 deletions(-)
>
> diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
> index 4737591c1143ae..f19f6c7c5b1242 100644
> --- a/drivers/nvme/host/core.c
> +++ b/drivers/nvme/host/core.c
> @@ -89,7 +89,6 @@ static dev_t nvme_chr_devt;
> static struct class *nvme_class;
> static struct class *nvme_subsys_class;
>
> -static int nvme_validate_ns(struct nvme_ns *ns);
> static void nvme_put_subsystem(struct nvme_subsystem *subsys);
> static void nvme_remove_invalid_namespaces(struct nvme_ctrl *ctrl,
> unsigned nsid);
> @@ -1009,7 +1008,7 @@ static u32 nvme_passthru_start(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
> * For simplicity, IO to all namespaces is quiesced even if the command
> * effects say only one namespace is affected.
> */
> - if (effects & (NVME_CMD_EFFECTS_LBCC | NVME_CMD_EFFECTS_CSE_MASK)) {
> + if (effects & NVME_CMD_EFFECTS_CSE_MASK) {
> mutex_lock(&ctrl->scan_lock);
> mutex_lock(&ctrl->subsys->lock);
> nvme_mpath_start_freeze(ctrl->subsys);
> @@ -1020,36 +1019,9 @@ static u32 nvme_passthru_start(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
> return effects;
> }
>
> -static void nvme_update_formats(struct nvme_ctrl *ctrl, u32 *effects)
> -{
> - struct nvme_ns *ns;
> -
> - down_read(&ctrl->namespaces_rwsem);
> - list_for_each_entry(ns, &ctrl->namespaces, list)
> - if (nvme_validate_ns(ns))
> - nvme_set_queue_dying(ns);
> - else if (blk_queue_is_zoned(ns->disk->queue)) {
> - /*
> - * IO commands are required to fully revalidate a zoned
> - * device. Force the command effects to trigger rescan
> - * work so report zones can run in a context with
> - * unfrozen IO queues.
> - */
> - *effects |= NVME_CMD_EFFECTS_NCC;
> - }
> - up_read(&ctrl->namespaces_rwsem);
> -}
> -
> static void nvme_passthru_end(struct nvme_ctrl *ctrl, u32 effects)
> {
> - /*
> - * Revalidate LBA changes prior to unfreezing. This is necessary to
> - * prevent memory corruption if a logical block size was changed by
> - * this command.
> - */
> - if (effects & NVME_CMD_EFFECTS_LBCC)
> - nvme_update_formats(ctrl, &effects);
> - if (effects & (NVME_CMD_EFFECTS_LBCC | NVME_CMD_EFFECTS_CSE_MASK)) {
> + if (effects & NVME_CMD_EFFECTS_CSE_MASK) {
> nvme_unfreeze(ctrl);
> nvme_mpath_unfreeze(ctrl->subsys);
> mutex_unlock(&ctrl->subsys->lock);
>
Looks OK, but I am not so knowledgeable in this area...
Anyway it does look consistent with the effect flags change in patch 14, so:
Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com>
--
Damien Le Moal
Western Digital Research
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next prev parent reply other threads:[~2020-09-28 15:02 UTC|newest]
Thread overview: 90+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-28 12:34 refactor the nvme scanning and validation code Christoph Hellwig
2020-09-28 12:34 ` [PATCH 01/20] block: optimize blk_queue_zoned_model for !CONFIG_BLK_DEV_ZONED Christoph Hellwig
2020-09-28 14:11 ` Damien Le Moal
2020-09-29 8:29 ` Sagi Grimberg
2020-09-29 18:25 ` Christoph Hellwig
2020-09-29 21:12 ` Chaitanya Kulkarni
2020-09-28 12:34 ` [PATCH 02/20] nvme: fix initialization of the zone bitmaps Christoph Hellwig
2020-09-28 14:13 ` Damien Le Moal
2020-09-28 14:16 ` Damien Le Moal
2020-09-28 14:26 ` Christoph Hellwig
2020-09-29 21:27 ` Keith Busch
2020-09-28 12:34 ` [PATCH 03/20] nvme: remove the disk argument to nvme_update_zone_info Christoph Hellwig
2020-09-28 14:17 ` Damien Le Moal
2020-09-29 8:32 ` Sagi Grimberg
2020-09-29 21:15 ` Chaitanya Kulkarni
2020-09-28 12:34 ` [PATCH 04/20] nvme: rename nvme_validate_ns to nvme_validate_or_alloc_ns Christoph Hellwig
2020-09-28 14:19 ` Damien Le Moal
2020-09-29 8:33 ` Sagi Grimberg
2020-09-29 21:17 ` Chaitanya Kulkarni
2020-09-28 12:34 ` [PATCH 05/20] nvme: rename _nvme_revalidate_disk Christoph Hellwig
2020-09-28 14:20 ` Damien Le Moal
2020-09-29 8:34 ` Sagi Grimberg
2020-09-29 21:18 ` Chaitanya Kulkarni
2020-09-28 12:34 ` [PATCH 06/20] nvme: rename __nvme_revalidate_disk Christoph Hellwig
2020-09-28 14:21 ` Damien Le Moal
2020-09-29 8:35 ` Sagi Grimberg
2020-09-29 21:20 ` Chaitanya Kulkarni
2020-09-28 12:34 ` [PATCH 07/20] nvme: lift the check for an unallocated namespace into nvme_identify_ns Christoph Hellwig
2020-09-28 14:27 ` Damien Le Moal
2020-09-29 18:29 ` Christoph Hellwig
2020-09-29 8:36 ` Sagi Grimberg
2020-09-29 21:22 ` Chaitanya Kulkarni
2020-09-28 12:34 ` [PATCH 08/20] nvme: call nvme_identify_ns as the first thing in nvme_alloc_ns_block Christoph Hellwig
2020-09-28 14:32 ` Damien Le Moal
2020-09-29 8:39 ` Sagi Grimberg
2020-09-29 18:30 ` Christoph Hellwig
2020-09-29 21:24 ` Chaitanya Kulkarni
2020-09-28 12:34 ` [PATCH 09/20] nvme: factor out a nvme_configure_metadata helper Christoph Hellwig
2020-09-28 14:35 ` Damien Le Moal
2020-09-29 8:40 ` Sagi Grimberg
2020-09-29 21:27 ` Chaitanya Kulkarni
2020-09-28 12:34 ` [PATCH 10/20] nvme: freeze the queue over ->lba_shift updates Christoph Hellwig
2020-09-28 14:49 ` Damien Le Moal
2020-09-29 8:48 ` Sagi Grimberg
2020-09-29 18:32 ` Christoph Hellwig
2020-09-29 19:07 ` Sagi Grimberg
2020-10-02 16:03 ` Sagi Grimberg
2020-10-05 8:32 ` Christoph Hellwig
2020-09-28 12:34 ` [PATCH 11/20] nvme: clean up the check for too large logic block sizes Christoph Hellwig
2020-09-28 14:50 ` Damien Le Moal
2020-09-29 18:33 ` Christoph Hellwig
2020-09-29 8:50 ` Sagi Grimberg
2020-09-29 18:34 ` Christoph Hellwig
2020-09-28 12:34 ` [PATCH 12/20] nvme: remove the 0 lba_shift check in nvme_update_ns_info Christoph Hellwig
2020-09-28 14:51 ` Damien Le Moal
2020-09-29 8:52 ` Sagi Grimberg
2020-09-29 18:34 ` Christoph Hellwig
2020-09-29 21:46 ` Chaitanya Kulkarni
2020-09-28 12:34 ` [PATCH 13/20] nvme: set the queue limits " Christoph Hellwig
2020-09-28 14:55 ` Damien Le Moal
2020-09-29 8:54 ` Sagi Grimberg
2020-09-29 21:52 ` Chaitanya Kulkarni
2020-09-30 6:12 ` Christoph Hellwig
2020-09-28 12:34 ` [PATCH 14/20] nvme: update the known admin effects Christoph Hellwig
2020-09-28 14:57 ` Damien Le Moal
2020-09-29 8:55 ` Sagi Grimberg
2020-09-29 21:54 ` Chaitanya Kulkarni
2020-09-28 12:34 ` [PATCH 15/20] nvme: remove nvme_update_formats Christoph Hellwig
2020-09-28 15:02 ` Damien Le Moal [this message]
2020-09-28 12:34 ` [PATCH 16/20] nvme: revalidate zone bitmaps in nvme_update_ns_info Christoph Hellwig
2020-09-28 15:06 ` Damien Le Moal
2020-09-29 18:37 ` Christoph Hellwig
2020-09-28 12:34 ` [PATCH 17/20] nvme: query namespae identifiers before adding the namespace Christoph Hellwig
2020-09-28 15:11 ` Damien Le Moal
2020-09-30 9:44 ` Niklas Cassel
2020-09-30 10:04 ` Niklas Cassel
2020-10-01 17:14 ` Christoph Hellwig
2020-10-01 17:43 ` Niklas Cassel
2020-10-02 6:41 ` Christoph Hellwig
2020-09-28 12:35 ` [PATCH 18/20] nvme: move nvme_validate_ns Christoph Hellwig
2020-09-28 15:12 ` Damien Le Moal
2020-09-30 0:22 ` Chaitanya Kulkarni
2020-09-30 6:13 ` Christoph Hellwig
2020-09-28 12:35 ` [PATCH 19/20] nvme: refactor nvme_validate_ns Christoph Hellwig
2020-09-28 15:15 ` Damien Le Moal
2020-09-29 18:40 ` Christoph Hellwig
2020-09-28 12:35 ` [PATCH 20/20] nvme: remove nvme_identify_ns_list Christoph Hellwig
2020-09-29 23:59 ` Chaitanya Kulkarni
2020-09-29 16:51 ` refactor the nvme scanning and validation code Keith Busch
2020-09-30 6:41 ` Christoph Hellwig
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