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blkcg, writeback: Implement wbc_blkcg_css()

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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>
This commit is contained in:
Tejun Heo 2019-06-27 13:39:51 -07:00 committed by Jens Axboe
parent 27b36d8fa8
commit 653c45c6b9
1 changed files with 11 additions and 0 deletions
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11
include/linux/writeback.h
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@ -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