linux-kernel - [PATCH 3/9] blkcg, writeback: Implement wbc_blkcg

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Date:   Sat, 15 Jun 2019 11:24:47 -0700
From:   Tejun Heo <tj@...nel.org>
To:     dsterba@...e.com, clm@...com, josef@...icpanda.com,
        axboe@...nel.dk, jack@...e.cz
Cc:     linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-block@...r.kernel.org, kernel-team@...com,
        Tejun Heo <tj@...nel.org>
Subject: [PATCH 3/9] blkcg, writeback: Implement wbc_blkcg_css()

Add a helper to determine the target blkcg from wbc.

Signed-off-by: Tejun Heo <tj@...nel.org>
Reviewed-by: Josef Bacik <josef@...icpanda.com>
---
 include/linux/writeback.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/include/linux/writeback.h b/include/linux/writeback.h
index b8f5f000cde4..800ee031e88a 100644
--- a/include/linux/writeback.h
+++ b/include/linux/writeback.h
@@ -11,6 +11,7 @@
 #include <linux/flex_proportions.h>
 #include <linux/backing-dev-defs.h>
 #include <linux/blk_types.h>
+#include <linux/blk-cgroup.h>
 
 struct bio;
 
@@ -93,6 +94,16 @@ static inline int wbc_to_write_flags(struct writeback_control *wbc)
 	return 0;
 }
 
+static inline struct cgroup_subsys_state *
+wbc_blkcg_css(struct writeback_control *wbc)
+{
+#ifdef CONFIG_CGROUP_WRITEBACK
+	if (wbc->wb)
+		return wbc->wb->blkcg_css;
+#endif
+	return blkcg_root_css;
+}
+
 /*
  * A wb_domain represents a domain that wb's (bdi_writeback's) belong to
  * and are measured against each other in.  There always is one global
-- 
2.17.1