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 <hare@suse.com>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Keith Busch <keith.busch@intel.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/block/blk-mq-sysfs.c b/block/blk-mq-sysfs.c
index aafb442..2d737f9 100644 (file)
--- 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,
 };