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Date: Tue, 14 Aug 2018 11:59:19 +0200
From: Matias Bjørling <mb@...htnvm.io>
To: hare@...e.de, axboe@...nel.dk
Cc: hch@....de, sagi@...mberg.me, keith.busch@...el.com,
bart.vanassche@....com, linux-nvme@...ts.infradead.org,
linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
hare@...e.com
Subject: Re: [PATCH 2/5] nvme: register ns_id attributes as default sysfs
groups
On 08/14/2018 09:33 AM, Hannes Reinecke wrote:
> We should be registering the ns_id attribute as default sysfs
> attribute groups, otherwise we have a race condition between
> the uevent and the attributes appearing in sysfs.
>
> Signed-off-by: Hannes Reinecke <hare@...e.com>
> Reviewed-by: Christoph Hellwig <hch@....de>
> ---
> drivers/nvme/host/core.c | 21 +++++++++------------
> drivers/nvme/host/lightnvm.c | 27 ++++-----------------------
> drivers/nvme/host/multipath.c | 15 ++++-----------
> drivers/nvme/host/nvme.h | 11 +++--------
> 4 files changed, 20 insertions(+), 54 deletions(-)
>
> diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
> index 0e824e8c8fd7..8e26d98e9a8f 100644
> --- a/drivers/nvme/host/core.c
> +++ b/drivers/nvme/host/core.c
> @@ -2734,6 +2734,12 @@ const struct attribute_group nvme_ns_id_attr_group = {
> .is_visible = nvme_ns_id_attrs_are_visible,
> };
>
> +const struct attribute_group *nvme_ns_id_attr_groups[] = {
> + &nvme_ns_id_attr_group,
> + NULL, /* Will be filled in by lightnvm if present */
> + NULL,
> +};
> +
> #define nvme_show_str_function(field) \
> static ssize_t field##_show(struct device *dev, \
> struct device_attribute *attr, char *buf) \
> @@ -3099,14 +3105,9 @@ static void nvme_alloc_ns(struct nvme_ctrl *ctrl, unsigned nsid)
>
> nvme_get_ctrl(ctrl);
>
> - device_add_disk(ctrl->device, ns->disk, NULL);
> - if (sysfs_create_group(&disk_to_dev(ns->disk)->kobj,
> - &nvme_ns_id_attr_group))
> - pr_warn("%s: failed to create sysfs group for identification\n",
> - ns->disk->disk_name);
> - if (ns->ndev && nvme_nvm_register_sysfs(ns))
> - pr_warn("%s: failed to register lightnvm sysfs group for identification\n",
> - ns->disk->disk_name);
> + if (ns->ndev)
> + nvme_nvm_register_sysfs(ns);
> + device_add_disk(ctrl->device, ns->disk, nvme_ns_id_attr_groups);
>
> nvme_mpath_add_disk(ns, id);
> nvme_fault_inject_init(ns);
> @@ -3132,10 +3133,6 @@ static void nvme_ns_remove(struct nvme_ns *ns)
>
> nvme_fault_inject_fini(ns);
> if (ns->disk && ns->disk->flags & GENHD_FL_UP) {
> - sysfs_remove_group(&disk_to_dev(ns->disk)->kobj,
> - &nvme_ns_id_attr_group);
> - if (ns->ndev)
> - nvme_nvm_unregister_sysfs(ns);
> del_gendisk(ns->disk);
> blk_cleanup_queue(ns->queue);
> if (blk_get_integrity(ns->disk))
> diff --git a/drivers/nvme/host/lightnvm.c b/drivers/nvme/host/lightnvm.c
> index 6fe5923c95d4..7bf2f9da6293 100644
> --- a/drivers/nvme/host/lightnvm.c
> +++ b/drivers/nvme/host/lightnvm.c
> @@ -1270,39 +1270,20 @@ static const struct attribute_group nvm_dev_attr_group_20 = {
> .attrs = nvm_dev_attrs_20,
> };
>
> -int nvme_nvm_register_sysfs(struct nvme_ns *ns)
> +void nvme_nvm_register_sysfs(struct nvme_ns *ns)
> {
> struct nvm_dev *ndev = ns->ndev;
> struct nvm_geo *geo = &ndev->geo;
>
> if (!ndev)
> - return -EINVAL;
> -
> - switch (geo->major_ver_id) {
> - case 1:
> - return sysfs_create_group(&disk_to_dev(ns->disk)->kobj,
> - &nvm_dev_attr_group_12);
> - case 2:
> - return sysfs_create_group(&disk_to_dev(ns->disk)->kobj,
> - &nvm_dev_attr_group_20);
> - }
> -
> - return -EINVAL;
> -}
> -
> -void nvme_nvm_unregister_sysfs(struct nvme_ns *ns)
> -{
> - struct nvm_dev *ndev = ns->ndev;
> - struct nvm_geo *geo = &ndev->geo;
> + return;
>
> switch (geo->major_ver_id) {
> case 1:
> - sysfs_remove_group(&disk_to_dev(ns->disk)->kobj,
> - &nvm_dev_attr_group_12);
> + nvme_ns_id_attr_groups[1] = &nvm_dev_attr_group_12;
> break;
> case 2:
> - sysfs_remove_group(&disk_to_dev(ns->disk)->kobj,
> - &nvm_dev_attr_group_20);
> + nvme_ns_id_attr_groups[1] = &nvm_dev_attr_group_20;
> break;
> }
> }
> diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c
> index 477af51d01e8..8e846095c42d 100644
> --- a/drivers/nvme/host/multipath.c
> +++ b/drivers/nvme/host/multipath.c
> @@ -282,13 +282,9 @@ static void nvme_mpath_set_live(struct nvme_ns *ns)
> if (!head->disk)
> return;
>
> - if (!(head->disk->flags & GENHD_FL_UP)) {
> - device_add_disk(&head->subsys->dev, head->disk, NULL);
> - if (sysfs_create_group(&disk_to_dev(head->disk)->kobj,
> - &nvme_ns_id_attr_group))
> - dev_warn(&head->subsys->dev,
> - "failed to create id group.\n");
> - }
> + if (!(head->disk->flags & GENHD_FL_UP))
> + device_add_disk(&head->subsys->dev, head->disk,
> + nvme_ns_id_attr_groups);
>
> kblockd_schedule_work(&ns->head->requeue_work);
> }
> @@ -494,11 +490,8 @@ void nvme_mpath_remove_disk(struct nvme_ns_head *head)
> {
> if (!head->disk)
> return;
> - if (head->disk->flags & GENHD_FL_UP) {
> - sysfs_remove_group(&disk_to_dev(head->disk)->kobj,
> - &nvme_ns_id_attr_group);
> + if (head->disk->flags & GENHD_FL_UP)
> del_gendisk(head->disk);
> - }
> blk_set_queue_dying(head->disk->queue);
> /* make sure all pending bios are cleaned up */
> kblockd_schedule_work(&head->requeue_work);
> diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
> index bb4a2003c097..9ba6d67d8e0a 100644
> --- a/drivers/nvme/host/nvme.h
> +++ b/drivers/nvme/host/nvme.h
> @@ -459,7 +459,7 @@ int nvme_delete_ctrl_sync(struct nvme_ctrl *ctrl);
> int nvme_get_log(struct nvme_ctrl *ctrl, u32 nsid, u8 log_page, u8 lsp,
> void *log, size_t size, u64 offset);
>
> -extern const struct attribute_group nvme_ns_id_attr_group;
> +extern const struct attribute_group *nvme_ns_id_attr_groups[];
> extern const struct block_device_operations nvme_ns_head_ops;
>
> #ifdef CONFIG_NVME_MULTIPATH
> @@ -551,8 +551,7 @@ static inline void nvme_mpath_stop(struct nvme_ctrl *ctrl)
> void nvme_nvm_update_nvm_info(struct nvme_ns *ns);
> int nvme_nvm_register(struct nvme_ns *ns, char *disk_name, int node);
> void nvme_nvm_unregister(struct nvme_ns *ns);
> -int nvme_nvm_register_sysfs(struct nvme_ns *ns);
> -void nvme_nvm_unregister_sysfs(struct nvme_ns *ns);
> +void nvme_nvm_register_sysfs(struct nvme_ns *ns);
> int nvme_nvm_ioctl(struct nvme_ns *ns, unsigned int cmd, unsigned long arg);
> #else
> static inline void nvme_nvm_update_nvm_info(struct nvme_ns *ns) {};
> @@ -563,11 +562,7 @@ static inline int nvme_nvm_register(struct nvme_ns *ns, char *disk_name,
> }
>
> static inline void nvme_nvm_unregister(struct nvme_ns *ns) {};
> -static inline int nvme_nvm_register_sysfs(struct nvme_ns *ns)
> -{
> - return 0;
> -}
> -static inline void nvme_nvm_unregister_sysfs(struct nvme_ns *ns) {};
> +static inline void nvme_nvm_register_sysfs(struct nvme_ns *ns) {};
> static inline int nvme_nvm_ioctl(struct nvme_ns *ns, unsigned int cmd,
> unsigned long arg)
> {
>
Thanks Hannes.
Acked-by: Matias Bjørling <mb@...htnvm.io>
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