null_blk: change type of completion_nsec to unsigned long
This commit at least doubles the maximum value for completion_nsec. This helps in special cases where one wants/needs to emulate an extremely slow I/O (for example to spot bugs). Signed-off-by: Paolo Valente <paolo.valente@unimore.it> Signed-off-by: Arianna Avanzini <avanzini@google.com> Signed-off-by: Jens Axboe <axboe@fb.com>
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