On Wed, Sep 28, 2016 at 3:45 AM, Damien Le Moal <damien.lemoal@xxxxxxxx> wrote:
> From: Hannes Reinecke <hare@xxxxxxx>
>
> The queue limits already have a 'chunk_sectors' setting, so
> we should be presenting it via sysfs.
>
> Signed-off-by: Hannes Reinecke <hare@xxxxxxx>
>
> [Damien: Updated Documentation/ABI/testing/sysfs-block]
>
> Signed-off-by: Damien Le Moal <damien.lemoal@xxxxxxxx>
> ---
> Documentation/ABI/testing/sysfs-block | 13 +++++++++++++
> block/blk-sysfs.c | 11 +++++++++++
> 2 files changed, 24 insertions(+)
>
> diff --git a/Documentation/ABI/testing/sysfs-block b/Documentation/ABI/testing/sysfs-block
> index 75a5055..ee2d5cd 100644
> --- a/Documentation/ABI/testing/sysfs-block
> +++ b/Documentation/ABI/testing/sysfs-block
> @@ -251,3 +251,16 @@ Description:
> since drive-managed zoned block devices do not support
> zone commands, they will be treated as regular block
> devices and zoned will report "none".
> +
> +What: /sys/block/<disk>/queue/chunk_sectors
> +Date: September 2016
> +Contact: Hannes Reinecke <hare@xxxxxxxx>
> +Description:
> + chunk_sectors has different meaning depending on the type
> + of the disk. For a RAID device (dm-raid), chunk_sectors
> + indicates the size in 512B sectors of the RAID volume
> + stripe segment. For a zoned block device, either
> + host-aware or host-managed, chunk_sectors indicates the
> + size of 512B sectors of the zones of the device, with
> + the eventual exception of the last zone of the device
> + which may be smaller.
> diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
> index ff9cd9c..488c2e2 100644
> --- a/block/blk-sysfs.c
> +++ b/block/blk-sysfs.c
> @@ -130,6 +130,11 @@ static ssize_t queue_physical_block_size_show(struct request_queue *q, char *pag
> return queue_var_show(queue_physical_block_size(q), page);
> }
>
> +static ssize_t queue_chunk_sectors_show(struct request_queue *q, char *page)
> +{
> + return queue_var_show(q->limits.chunk_sectors, page);
> +}
> +
> static ssize_t queue_io_min_show(struct request_queue *q, char *page)
> {
> return queue_var_show(queue_io_min(q), page);
> @@ -455,6 +460,11 @@ static struct queue_sysfs_entry queue_physical_block_size_entry = {
> .show = queue_physical_block_size_show,
> };
>
> +static struct queue_sysfs_entry queue_chunk_sectors_entry = {
> + .attr = {.name = "chunk_sectors", .mode = S_IRUGO },
> + .show = queue_chunk_sectors_show,
> +};
> +
> static struct queue_sysfs_entry queue_io_min_entry = {
> .attr = {.name = "minimum_io_size", .mode = S_IRUGO },
> .show = queue_io_min_show,
> @@ -555,6 +565,7 @@ static struct attribute *default_attrs[] = {
> &queue_hw_sector_size_entry.attr,
> &queue_logical_block_size_entry.attr,
> &queue_physical_block_size_entry.attr,
> + &queue_chunk_sectors_entry.attr,
> &queue_io_min_entry.attr,
> &queue_io_opt_entry.attr,
> &queue_discard_granularity_entry.attr,
> --
> 2.7.4
Reviewed-by: Shaun Tancheff <shaun.tancheff@xxxxxxxxxxx>
Tested-by: Shaun Tancheff <shaun.tancheff@xxxxxxxxxxx>
>
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--
Shaun Tancheff
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