[PATCH 3/9] blkcg, writeback: Implement wbc_blkcg_css()
From: Tejun Heo <tj@kernel.org>
Date: 2019-06-15 18:25:51
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> Reviewed-by: Josef Bacik <josef@toxicpanda.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