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SubjectRe: [PATCH 3/9] blkcg, writeback: Implement wbc_blkcg_css()
On Sat 15-06-19 11:24:47, Tejun Heo wrote:
> 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>

Looks good to me. You can add:

Reviewed-by: Jan Kara <jack@suse.cz>

Honza

> ---
> 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
>
--
Jan Kara <jack@suse.com>
SUSE Labs, CR

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