Name
blk_queue_dma_alignment — 
     set dma length and memory alignment
 
Synopsis
| void blk_queue_dma_alignment ( | struct request_queue * q, | 
|  | int mask ); | 
 
Arguments
- q
- 
     the request queue for the device
     
- mask
- 
     alignment mask
     
description
   set required memory and length alignment for direct dma transactions.
   this is used when building direct io requests for the queue.