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Subject[PATCH 06/14] blk-mq: add 'type' attribute to the sysfs hctx directory
Date
It can be useful for a user to verify what type a given hardware
queue is, expose this information in sysfs.

Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
block/blk-mq-sysfs.c | 10 ++++++++++
1 file changed, 10 insertions(+)

diff --git a/block/blk-mq-sysfs.c b/block/blk-mq-sysfs.c
index aafb44224c89..2d737f9e7ba7 100644
--- a/block/blk-mq-sysfs.c
+++ b/block/blk-mq-sysfs.c
@@ -161,6 +161,11 @@ static ssize_t blk_mq_hw_sysfs_cpus_show(struct blk_mq_hw_ctx *hctx, char *page)
return ret;
}

+static ssize_t blk_mq_hw_sysfs_type_show(struct blk_mq_hw_ctx *hctx, char *page)
+{
+ return sprintf(page, "%u\n", hctx->type);
+}
+
static struct attribute *default_ctx_attrs[] = {
NULL,
};
@@ -177,11 +182,16 @@ static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_cpus = {
.attr = {.name = "cpu_list", .mode = 0444 },
.show = blk_mq_hw_sysfs_cpus_show,
};
+static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_type = {
+ .attr = {.name = "type", .mode = 0444 },
+ .show = blk_mq_hw_sysfs_type_show,
+};

static struct attribute *default_hw_ctx_attrs[] = {
&blk_mq_hw_sysfs_nr_tags.attr,
&blk_mq_hw_sysfs_nr_reserved_tags.attr,
&blk_mq_hw_sysfs_cpus.attr,
+ &blk_mq_hw_sysfs_type.attr,
NULL,
};

--
2.17.1
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