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  • Tejun Heo's avatar
    blkcg: let blkio_group point to blkio_cgroup directly · 7ee9c562
    Tejun Heo authored
    Currently, blkg points to the associated blkcg via its css_id.  This
    unnecessarily complicates dereferencing blkcg.  Let blkg hold a
    reference to the associated blkcg and point directly to it and disable
    css_id on blkio_subsys.
    This change requires splitting blkiocg_destroy() into
    blkiocg_pre_destroy() and blkiocg_destroy() so that all blkg's can be
    destroyed and all the blkcg references held by them dropped during
    cgroup removal.
    Signed-off-by: default avatarTejun Heo <>
    Cc: Vivek Goyal <>
    Signed-off-by: default avatarJens Axboe <>