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  • Jens Axboe's avatar
    blk-wbt: don't maintain inflight counts if disabled · c125311d
    Jens Axboe authored
    A previous commit removed the ability to have per-rq flags. We used
    those flags to maintain inflight counts. Since we don't have those
    anymore, we have to always maintain inflight counts, even if wbt is
    disabled. This is clearly suboptimal.
    
    Add a queue quiesce around changing the wbt latency settings from sysfs
    to work around this. With that, we can reliably put the enabled check in
    our bio_to_wbt_flags(), since we know the WBT_TRACKED flag will be
    consistent for the lifetime of the request.
    
    Fixes: c1c80384
    
     ("block: remove external dependency on wbt_flags")
    Reviewed-by: default avatarJosef Bacik <josef@toxicpanda.com>
    Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
    c125311d