357  * blk_queue_alignment_offset - set physical block alignment offset
359  * @offset: alignment offset in bytes
491  *    attempt to combine the values and ensure proper alignment.
494  *    top device's block sizes and alignment offsets may be adjusted to
495  *    ensure alignment with the bottom device. If no compatible sizes
503 	unsigned int top, bottom, alignment, ret = 0;  in blk_stack_limits()  local
532 	alignment = queue_limit_alignment_offset(b, start);  in blk_stack_limits()
534 	/* Bottom device has different alignment.  Check that it is  in blk_stack_limits()
535 	 * compatible with the current top alignment.  in blk_stack_limits()
537 	if (t->alignment_offset != alignment) {  in blk_stack_limits()
541 		bottom = max(b->physical_block_size, b->io_min) + alignment;  in blk_stack_limits()
596 	t->alignment_offset = lcm_not_zero(t->alignment_offset, alignment)  in blk_stack_limits()
609 	/* Discard alignment and granularity */  in blk_stack_limits()
611 		alignment = queue_limit_discard_alignment(b, start);  in blk_stack_limits()
614 		    t->discard_alignment != alignment) {  in blk_stack_limits()
616 			bottom = b->discard_granularity + alignment;  in blk_stack_limits()
629 		t->discard_alignment = lcm_not_zero(t->discard_alignment, alignment) %  in blk_stack_limits()
723  * blk_queue_dma_alignment - set dma length and memory alignment
725  * @mask:  alignment mask
728  *    set required memory and length alignment for direct dma transactions.
739  * blk_queue_update_dma_alignment - update dma length and memory alignment
741  * @mask:  alignment mask
744  *    update required memory and length alignment for direct dma transactions.
745  *    If the requested alignment is larger than the current alignment, then
746  *    the current queue alignment is updated to the new value, otherwise it