cciss: factor out scatter gather chain block mapping code

cciss: factor out scatter gather chain block mapping code
Rationale is I want to use this code from the scsi half of the
driver.

Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
1 file changed