Commit 653c45c6 authored by Tejun Heo's avatar Tejun Heo Committed by Jens Axboe
Browse files

blkcg, writeback: Implement wbc_blkcg_css() 



Add a helper to determine the target blkcg from wbc.

Reviewed-by: default avatarJosef Bacik <josef@toxicpanda.com>
Reviewed-by: default avatarJan Kara <jack@suse.cz>
Signed-off-by: default avatarTejun Heo <tj@kernel.org>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 27b36d8f

include/linux/writeback.h

+11 −0
Original line number Diff line number Diff line
@@ -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