Hello,

On Wed, Apr 28, 2021 at 04:04:46AM +0530, Muneendra wrote:
...

+static inline int blkcg_set_fc_appid(char *app_id, u64 cgrp_id, size_t app_id_len)
+{

...

+	strlcpy(blkcg->fc_app_id, app_id, app_id_len);
+}

...

+static inline char *blkcg_get_fc_appid(struct bio *bio)
+{
+	if (bio && bio->bi_blkg &&
+		(bio->bi_blkg->blkcg->fc_app_id[0] != '\0'))
+		return bio->bi_blkg->blkcg->fc_app_id;
+	return NULL;
+}

So, there's reader-writer race here but if that's okay for the use case,
please note that with a comment. Otherwise:

Acked-by: Tejun Heo <tj@kernel.org>

Thanks.

-- 
tejun