linux-kernel - Re: [PATCH -next v2 6/6] blk-sysfs: add a new attr_group for blk

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Message-ID: <8cafbd02-182a-4071-7e04-cc6f96045852@huaweicloud.com>
Date:   Fri, 26 May 2023 17:38:10 +0800
From:   Yu Kuai <yukuai1@...weicloud.com>
To:     Yu Kuai <yukuai1@...weicloud.com>, hch@....de, tj@...nel.org,
        josef@...icpanda.com, axboe@...nel.dk
Cc:     lukas.bulwahn@...il.com, cgroups@...r.kernel.org,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        yi.zhang@...wei.com, yangerkun@...wei.com,
        "yukuai (C)" <yukuai3@...wei.com>
Subject: Re: [PATCH -next v2 6/6] blk-sysfs: add a new attr_group for blk_mq

Hi, Christoph

在 2023/05/12 17:35, Yu Kuai 写道:
> From: Yu Kuai <yukuai3@...wei.com>
> 
> Currently wbt sysfs entry is created for bio based device, and wbt can
> be enabled for such device through sysfs while it doesn't make sense
> because wbt can only work for rq based device. In the meantime, there
> are other similar sysfs entries.
> 
> Fix this by adding a new attr_group for blk_mq, and sysfs entries will
> only be created when the device is rq based.
> 
> Suggested-by: Christoph Hellwig <hch@....de>
> Signed-off-by: Yu Kuai <yukuai3@...wei.com>

Any comments about this patch?

Thanks,
Kuai
> ---
>   block/blk-sysfs.c | 42 +++++++++++++++++++++++++++++++-----------
>   1 file changed, 31 insertions(+), 11 deletions(-)
> 
> diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
> index 6c1c4ba66bc0..afc797fb0dfc 100644
> --- a/block/blk-sysfs.c
> +++ b/block/blk-sysfs.c
> @@ -621,7 +621,6 @@ QUEUE_RW_ENTRY(queue_wb_lat, "wbt_lat_usec");
>   #endif
>   
>   static struct attribute *queue_attrs[] = {
> -	&queue_requests_entry.attr,
>   	&queue_ra_entry.attr,
>   	&queue_max_hw_sectors_entry.attr,
>   	&queue_max_sectors_entry.attr,
> @@ -629,7 +628,6 @@ static struct attribute *queue_attrs[] = {
>   	&queue_max_discard_segments_entry.attr,
>   	&queue_max_integrity_segments_entry.attr,
>   	&queue_max_segment_size_entry.attr,
> -	&elv_iosched_entry.attr,
>   	&queue_hw_sector_size_entry.attr,
>   	&queue_logical_block_size_entry.attr,
>   	&queue_physical_block_size_entry.attr,
> @@ -650,7 +648,6 @@ static struct attribute *queue_attrs[] = {
>   	&queue_max_open_zones_entry.attr,
>   	&queue_max_active_zones_entry.attr,
>   	&queue_nomerges_entry.attr,
> -	&queue_rq_affinity_entry.attr,
>   	&queue_iostats_entry.attr,
>   	&queue_stable_writes_entry.attr,
>   	&queue_random_entry.attr,
> @@ -658,11 +655,7 @@ static struct attribute *queue_attrs[] = {
>   	&queue_wc_entry.attr,
>   	&queue_fua_entry.attr,
>   	&queue_dax_entry.attr,
> -#ifdef CONFIG_BLK_WBT
> -	&queue_wb_lat_entry.attr,
> -#endif
>   	&queue_poll_delay_entry.attr,
> -	&queue_io_timeout_entry.attr,
>   #ifdef CONFIG_BLK_DEV_THROTTLING_LOW
>   	&blk_throtl_sample_time_entry.attr,
>   #endif
> @@ -671,16 +664,23 @@ static struct attribute *queue_attrs[] = {
>   	NULL,
>   };
>   
> +static struct attribute *blk_mq_queue_attrs[] = {
> +	&queue_requests_entry.attr,
> +	&elv_iosched_entry.attr,
> +	&queue_rq_affinity_entry.attr,
> +	&queue_io_timeout_entry.attr,
> +#ifdef CONFIG_BLK_WBT
> +	&queue_wb_lat_entry.attr,
> +#endif
> +	NULL,
> +};
> +
>   static umode_t queue_attr_visible(struct kobject *kobj, struct attribute *attr,
>   				int n)
>   {
>   	struct gendisk *disk = container_of(kobj, struct gendisk, queue_kobj);
>   	struct request_queue *q = disk->queue;
>   
> -	if (attr == &queue_io_timeout_entry.attr &&
> -		(!q->mq_ops || !q->mq_ops->timeout))
> -			return 0;
> -
>   	if ((attr == &queue_max_open_zones_entry.attr ||
>   	     attr == &queue_max_active_zones_entry.attr) &&
>   	    !blk_queue_is_zoned(q))
> @@ -689,11 +689,30 @@ static umode_t queue_attr_visible(struct kobject *kobj, struct attribute *attr,
>   	return attr->mode;
>   }
>   
> +static umode_t blk_mq_queue_attr_visible(struct kobject *kobj,
> +					 struct attribute *attr, int n)
> +{
> +	struct gendisk *disk = container_of(kobj, struct gendisk, queue_kobj);
> +	struct request_queue *q = disk->queue;
> +
> +	if (!queue_is_mq(q))
> +		return 0;
> +
> +	if (attr == &queue_io_timeout_entry.attr && !q->mq_ops->timeout)
> +		return 0;
> +
> +	return attr->mode;
> +}
> +
>   static struct attribute_group queue_attr_group = {
>   	.attrs = queue_attrs,
>   	.is_visible = queue_attr_visible,
>   };
>   
> +static struct attribute_group blk_mq_queue_attr_group = {
> +	.attrs = blk_mq_queue_attrs,
> +	.is_visible = blk_mq_queue_attr_visible,
> +};
>   
>   #define to_queue(atr) container_of((atr), struct queue_sysfs_entry, attr)
>   
> @@ -738,6 +757,7 @@ static const struct sysfs_ops queue_sysfs_ops = {
>   
>   static const struct attribute_group *blk_queue_attr_groups[] = {
>   	&queue_attr_group,
> +	&blk_mq_queue_attr_group,
>   	NULL
>   };
>   
>