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  • Tejun Heo's avatar
    writeback: add {CONFIG|BDI_CAP|FS}_CGROUP_WRITEBACK · 89e9b9e0
    Tejun Heo authored
    
    
    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: default avatarTejun Heo <tj@kernel.org>
    Cc: Jens Axboe <axboe@kernel.dk>
    Cc: Jan Kara <jack@suse.cz>
    Signed-off-by: default avatarJens Axboe <axboe@fb.com>
    89e9b9e0