null_blk: add blocking mode

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This adds a new module parameter to null_blk, blocking. If set, null_blk
will set the BLK_MQ_F_BLOCKING flag, indicating that it sometimes/always
needs to block in its ->queue_rq() function.  The intent is to help find
regressions in blocking drivers, since not many of them exist.

If null_blk is loaded with submit_queues > 1 and blocking=1, this
shows the regression recently fixed by bf4907c05e.

Reviewed-by: Bart Van Assche <bart.vanassche@sandisk.com>
Signed-off-by: Jens Axboe <axboe@fb.com>

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This commit is contained in:

Jens Axboe 2017-03-30 13:44:26 -06:00

parent bf4907c05e

commit db5bcf87bb

1 changed files with 9 additions and 0 deletions

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9

drivers/block/null_blk.c

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