1 files changed, 38 insertions, 24 deletions
diff --git a/block/bio.c b/block/bio.c
index 90089124b512..f0f069c1823c 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -1957,30 +1957,6 @@ EXPORT_SYMBOL(bioset_init_from_src);
 
 #ifdef CONFIG_BLK_CGROUP
 
-#ifdef CONFIG_MEMCG
-/**
- * bio_associate_blkcg_from_page - associate a bio with the page's blkcg
- * @bio: target bio
- * @page: the page to lookup the blkcg from
- *
- * Associate @bio with the blkcg from @page's owning memcg.  This works like
- * every other associate function wrt references.
- */
-int bio_associate_blkcg_from_page(struct bio *bio, struct page *page)
-{
-	struct cgroup_subsys_state *blkcg_css;
-
-	if (unlikely(bio->bi_css))
-		return -EBUSY;
-	if (!page->mem_cgroup)
-		return 0;
-	blkcg_css = cgroup_get_e_css(page->mem_cgroup->css.cgroup,
-				     &io_cgrp_subsys);
-	bio->bi_css = blkcg_css;
-	return 0;
-}
-#endif /* CONFIG_MEMCG */
-
 /**
  * bio_associate_blkcg - associate a bio with the specified blkcg
  * @bio: target bio
@@ -2045,6 +2021,44 @@ static void __bio_associate_blkg(struct bio *bio, struct blkcg_gq *blkg)
 	bio->bi_blkg = blkg_try_get_closest(blkg);
 }
 
+static void __bio_associate_blkg_from_css(struct bio *bio,
+					  struct cgroup_subsys_state *css)
+{
+	struct blkcg_gq *blkg;
+
+	rcu_read_lock();
+
+	blkg = blkg_lookup_create(css_to_blkcg(css), bio->bi_disk->queue);
+	__bio_associate_blkg(bio, blkg);
+
+	rcu_read_unlock();
+}
+
+#ifdef CONFIG_MEMCG
+/**
+ * bio_associate_blkg_from_page - associate a bio with the page's blkg
+ * @bio: target bio
+ * @page: the page to lookup the blkcg from
+ *
+ * Associate @bio with the blkg from @page's owning memcg and the respective
+ * request_queue.  This works like every other associate function wrt
+ * references.
+ */
+void bio_associate_blkg_from_page(struct bio *bio, struct page *page)
+{
+	struct cgroup_subsys_state *css;
+
+	if (unlikely(bio->bi_css))
+		return;
+	if (!page->mem_cgroup)
+		return;
+
+	css = cgroup_get_e_css(page->mem_cgroup->css.cgroup, &io_cgrp_subsys);
+	bio->bi_css = css;
+	__bio_associate_blkg_from_css(bio, css);
+}
+#endif /* CONFIG_MEMCG */
+
 /**
  * bio_associate_blkg - associate a bio with a blkg
  * @bio: target bio