[PATCH 2/8] blkcg, writeback: Implement wbc_blkcg_css()
From: Tejun Heo <tj@kernel.org>
Date: 2019-06-14 00:34:03
Also in:
linux-btrfs, lkml
Subsystem:
page cache, the rest · Maintainers:
Matthew Wilcox, Jan Kara, Linus Torvalds
Add a helper to determine the target blkcg from wbc. Signed-off-by: Tejun Heo <tj@kernel.org> --- include/linux/writeback.h | 10 ++++++++++ 1 file changed, 10 insertions(+)
diff --git a/include/linux/writeback.h b/include/linux/writeback.h
index b8f5f000cde4..1c85563f035d 100644
--- a/include/linux/writeback.h
+++ b/include/linux/writeback.h@@ -93,6 +93,16 @@ 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
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2.17.1