tree 194810fa9bd85a9d0e3145eeafc4a305057757f8
parent 4aa9c692e052cf6db99db62a8fe0543e5c455da7
author Tejun Heo <tj@kernel.org> 1432329216 -0400
committer Jens Axboe <axboe@fb.com> 1433255615 -0600

writeback: add {CONFIG|BDI_CAP|FS}_CGROUP_WRITEBACK

cgroup writeback requires support from both bdi and filesystem sides.
Add BDI_CAP_CGROUP_WRITEBACK and FS_CGROUP_WRITEBACK to indicate
support and enable BDI_CAP_CGROUP_WRITEBACK on block based bdi's by
default.  Also, define CONFIG_CGROUP_WRITEBACK which is enabled if
both MEMCG and BLK_CGROUP are enabled.

inode_cgwb_enabled() which determines whether a given inode's both bdi
and fs support cgroup writeback is added.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Jan Kara <jack@suse.cz>
Signed-off-by: Jens Axboe <axboe@fb.com>