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[dm-devel] Re: [PATCH 20/25] io-controller: map async requests to appropriate cgroup



Vivek Goyal wrote:
...
> +
> +struct io_group *io_get_io_group_bio(struct request_queue *q, struct bio *bio,
> +					int create)
> +{
> +	struct page *page = NULL;
> +
> +	/*
> +	 * Determine the group from task context. Even calls from
> +	 * blk_get_request() which don't have any bio info will be mapped
> +	 * to the task's group
> +	 */
> +	if (!bio)
> +		goto sync;
> +
> +	if (bio_barrier(bio)) {
> +		/*
> +		 * Map barrier requests to root group. May be more special
> +		 * bio cases should come here
> +		 */
> +		return q->elevator->efqd.root_group;
> +	}
> +
> +	/* Map the sync bio to the right group using task context */
> +	if (elv_bio_sync(bio))
> +		goto sync;
> +
> +#ifdef CONFIG_TRACK_ASYNC_CONTEXT
> +	/* Determine the group from info stored in page */
> +	page = bio_iovec_idx(bio, 0)->bv_page;
> +	return io_get_io_group(q, page, create);
> +#endif
> +
> +sync:
> +	return io_get_io_group(q, NULL, create);

Fix build warning.

block/elevator-fq.c: In function ‘io_get_io_group_bio’:
block/elevator-fq.c:2075: warning: unused variable ‘page’

---
diff --git a/block/elevator-fq.c b/block/elevator-fq.c
index 66b10eb..d304f79 100644
--- a/block/elevator-fq.c
+++ b/block/elevator-fq.c
@@ -2102,7 +2102,7 @@ struct io_group *io_get_io_group_bio(struct request_queue *q, struct bio *bio,
 #endif
 
 sync:
-	return io_get_io_group(q, NULL, create);
+	return io_get_io_group(q, page, create);
 }
 EXPORT_SYMBOL(io_get_io_group_bio);


> +}
> +EXPORT_SYMBOL(io_get_io_group_bio);
> +


-- 
Regards
Gui Jianfeng


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