Re: [RFC v2 1/3] block: Introduce blk_bio_map_sg() to map one bio

From: Jens Axboe
Date: Fri Jun 03 2016 - 10:36:09 EST

On 05/27/2016 05:11 AM, Baolin Wang wrote:
In dm-crypt, it need to map one bio to scatterlist for improving the
hardware engine encryption efficiency. Thus this patch introduces the
blk_bio_map_sg() function to map one bio with scatterlists.

For avoiding the duplicated code in __blk_bios_map_sg() function, add
one parameter to distinguish bio map or request map.

Just detach the bio in blk_bio_map_sg() instead of adding a separate case (and argument) for it in __blk_bios_map_sg().

Jens Axboe