blk_lld_busy man page on Oracle

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BLK_LLD_BUSY(9)			 Block Devices		       BLK_LLD_BUSY(9)

       blk_lld_busy - Check if underlying low-level drivers of a device are

       int blk_lld_busy(struct request_queue * q);

	   the queue of the device being checked

       Check if underlying low-level drivers of a device are busy. If the
       drivers want to export their busy state, they must set own exporting
       function using blk_queue_lld_busy first.

       Basically, this function is used only by request stacking drivers to
       stop dispatching requests to underlying devices when underlying devices
       are busy. This behavior helps more I/O merging on the queue of the
       request stacking driver and prevents I/O throughput regression on burst
       I/O load.

       0 - Not busy (The request stacking driver should dispatch request) 1 -
       Busy (The request stacking driver should stop dispatching request)

Kernel Hackers Manual 3.8.	   June 2014		       BLK_LLD_BUSY(9)

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