linux-kernel - Re: [PATCH v2 2/2] block: add max_active

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Date:   Fri, 3 Jul 2020 16:15:38 +0200
From:   Greg KH <greg@...ah.com>
To:     Niklas Cassel <niklas.cassel@....com>
Cc:     Jonathan Corbet <corbet@....net>, Jens Axboe <axboe@...nel.dk>,
        Keith Busch <kbusch@...nel.org>,
        Christoph Hellwig <hch@....de>,
        Sagi Grimberg <sagi@...mberg.me>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Javier González <javier@...igon.com>,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-block@...r.kernel.org, linux-nvme@...ts.infradead.org,
        linux-scsi@...r.kernel.org
Subject: Re: [PATCH v2 2/2] block: add max_active_zones to blk-sysfs

On Thu, Jul 02, 2020 at 08:19:22PM +0200, Niklas Cassel wrote:
> Add a new max_active zones definition in the sysfs documentation.
> This definition will be common for all devices utilizing the zoned block
> device support in the kernel.
> 
> Export max_active_zones according to this new definition for NVMe Zoned
> Namespace devices, ZAC ATA devices (which are treated as SCSI devices by
> the kernel), and ZBC SCSI devices.
> 
> Add the new max_active_zones member to struct request_queue, rather
> than as a queue limit, since this property cannot be split across stacking
> drivers.
> 
> For SCSI devices, even though max active zones is not part of the ZBC/ZAC
> spec, export max_active_zones as 0, signifying "no limit".
> 
> Signed-off-by: Niklas Cassel <niklas.cassel@....com>
> Reviewed-by: Javier González <javier@...igon.com>
> ---
>  Documentation/block/queue-sysfs.rst |  7 +++++++
>  block/blk-sysfs.c                   | 14 +++++++++++++-
>  drivers/nvme/host/zns.c             |  1 +
>  drivers/scsi/sd_zbc.c               |  1 +
>  include/linux/blkdev.h              | 16 ++++++++++++++++
>  5 files changed, 38 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/block/queue-sysfs.rst b/Documentation/block/queue-sysfs.rst
> index f01cf8530ae4..f261a5c84170 100644
> --- a/Documentation/block/queue-sysfs.rst
> +++ b/Documentation/block/queue-sysfs.rst
> @@ -117,6 +117,13 @@ Maximum number of elements in a DMA scatter/gather list with integrity
>  data that will be submitted by the block layer core to the associated
>  block driver.
>  
> +max_active_zones (RO)
> +---------------------
> +For zoned block devices (zoned attribute indicating "host-managed" or
> +"host-aware"), the sum of zones belonging to any of the zone states:
> +EXPLICIT OPEN, IMPLICIT OPEN or CLOSED, is limited by this value.
> +If this value is 0, there is no limit.

Shouldn't this all be in Documentation/ABI/ to describe the sysfs files?
All other kernel subsystems use that format, why is block special?


> +
>  max_open_zones (RO)
>  -------------------
>  For zoned block devices (zoned attribute indicating "host-managed" or
> diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
> index fa42961e9678..624bb4d85fc7 100644
> --- a/block/blk-sysfs.c
> +++ b/block/blk-sysfs.c
> @@ -310,6 +310,11 @@ static ssize_t queue_max_open_zones_show(struct request_queue *q, char *page)
>  	return queue_var_show(queue_max_open_zones(q), page);
>  }
>  
> +static ssize_t queue_max_active_zones_show(struct request_queue *q, char *page)
> +{
> +	return queue_var_show(queue_max_active_zones(q), page);
> +}
> +
>  static ssize_t queue_nomerges_show(struct request_queue *q, char *page)
>  {
>  	return queue_var_show((blk_queue_nomerges(q) << 1) |
> @@ -677,6 +682,11 @@ static struct queue_sysfs_entry queue_max_open_zones_entry = {
>  	.show = queue_max_open_zones_show,
>  };
>  
> +static struct queue_sysfs_entry queue_max_active_zones_entry = {
> +	.attr = {.name = "max_active_zones", .mode = 0444 },
> +	.show = queue_max_active_zones_show,
> +};

__ATTR_RO()?

thanks,

greg k-h