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blk_sync_queue(9) - phpMan

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BLK_SYNC_QUEUE(9)                         Block Devices                         BLK_SYNC_QUEUE(9)

       blk_sync_queue - cancel any pending callbacks on a queue

       void blk_sync_queue(struct request_queue * q);

           the queue

       The block layer may perform asynchronous callback activity on a queue, such as calling the
       unplug function after a timeout. A block device may call blk_sync_queue to ensure that any
       such activity is cancelled, thus allowing it to release resources that the callbacks might
       use. The caller must already have made sure that its ->make_request_fn will not re-add
       plugging prior to calling this function.

       This function does not cancel any asynchronous activity arising out of elevator or
       throttling code. That would require elevator_exit and blkcg_exit_queue to be called with
       queue lock initialized.

Kernel Hackers Manual 4.8.                 January 2017                         BLK_SYNC_QUEUE(9)

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