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| author | Tejun Heo <tj@kernel.org> | 2019-06-27 23:39:51 +0300 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2019-07-10 18:00:57 +0300 |
| commit | 653c45c6b90c9659facbef10546d1f3a8e37d0cf (patch) | |
| tree | 41f5f5435fdb7c50c7ad682fc1dc214a4f33a1dc | |
| parent | 27b36d8fa81fa8274fb72f4eb1484026f6b6daa8 (diff) | |
| download | linux-653c45c6b90c9659facbef10546d1f3a8e37d0cf.tar.xz | |
blkcg, writeback: Implement wbc_blkcg_css()
Add a helper to determine the target blkcg from wbc.
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
| -rw-r--r-- | include/linux/writeback.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/include/linux/writeback.h b/include/linux/writeback.h index 33a50fa09fac..e056a22075cf 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; @@ -101,6 +102,16 @@ 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 |