blk-mq: add 'type' attribute to the sysfs hctx directory

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 <[email protected]> Reviewed-by: Bart Van Assche <[email protected]> Reviewed-by: Keith Busch <[email protected]> Reviewed-by: Sagi Grimberg <[email protected]> Signed-off-by: Jens Axboe <[email protected]>
berg · Nov 7, 2018 · a783b81 · a783b81
1 parent f31967f
commit a783b81
Showing 1 changed file with 10 additions and 0 deletions.
diff --git 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,
 };