blkcg: consolidate bio_issue_init() to be a part of core

bio_issue_init among other things initializes the timestamp for an IO.
Rather than have this logic handled by policies, this consolidates it to
be on the init paths (normal, clone, bounce clone).

Signed-off-by: Dennis Zhou <[email protected]>
Acked-by: Tejun Heo <[email protected]>
Reviewed-by: Liu Bo <[email protected]>
Reviewed-by: Josef Bacik <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>

block/bounce.c

@@ -278,6 +278,7 @@ static struct bio *bounce_clone_bio(struct bio *bio_src, gfp_t gfp_mask,
 	}
 
 	bio_clone_blkcg_association(bio, bio_src);
+	blkcg_bio_issue_init(bio);
 
 	return bio;
 }