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  • Tejun Heo's avatar
    blkcg: move per-queue blkg list heads and counters to queue and blkg · 4eef3049
    Tejun Heo authored
    Currently, specific policy implementations are responsible for
    maintaining list and number of blkgs.  This duplicates code
    unnecessarily, and hinders factoring common code and providing blkcg
    API with better defined semantics.
    After this patch, request_queue hosts list heads and counters and blkg
    has list nodes for both policies.  This patch only relocates the
    necessary fields and the next patch will actually move management code
    into blkcg core.
    Note that request_queue->blkg_list[] and ->nr_blkgs[] are hardcoded to
    have 2 elements.  This is to avoid include dependency and will be
    removed by the next patch.
    This patch doesn't introduce any behavior change.
    -v2: Now unnecessary conditional on CONFIG_BLK_CGROUP_MODULE removed
         as pointed out by Vivek.
    Signed-off-by: default avatarTejun Heo <>
    Cc: Vivek Goyal <>
    Signed-off-by: default avatarJens Axboe <>