Introduce these two functions and export them such that the next patch
can add calls to these functions from the SCSI core.
Signed-off-by: NBart Van Assche <bart.vanassche@wdc.com>
Acked-by: NTejun Heo <tj@kernel.org>
Acked-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>