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  • Tejun Heo's avatar
    blkcg: implement blkcg_policy->on/offline_pd_fn() and blkcg_gq->online · f427d909
    Tejun Heo authored Jan 09, 2013
    
    
    Add two blkcg_policy methods, ->online_pd_fn() and ->offline_pd_fn(),
    which are invoked as the policy_data gets activated and deactivated
    while holding both blkcg and q locks.
    
    Also, add blkcg_gq->online bool, which is set and cleared as the
    blkcg_gq gets activated and deactivated.  This flag also is toggled
    while holding both blkcg and q locks.
    
    These will be used to implement hierarchical stats.
    
    Signed-off-by: default avatarTejun Heo <tj@kernel.org>
    Acked-by: default avatarVivek Goyal <vgoyal@redhat.com>
    f427d909

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