[dm-devel] [PATCH 0/2] Introduce the request handling for dm-crypt

[Christoph Hellwig]

On Wed, Nov 11, 2015 at 05:31:43PM +0800, Baolin Wang wrote:
> Now the dm-crypt code only implemented the 'based-bio' method to encrypt/
> decrypt block data, which can only hanle one bio at one time. As we know,
> one bio must use the sequential physical address and it also has a limitation
> of length. Thus it may limit the big block encyrtion/decryption when some
> hardware support the big block data encryption.
> 
> This patch series introduc the 'based-request' method to handle the data
> encryption/decryption. One request can contain multiple bios, so it can
> handle big block data to improve the efficiency.

NAK for more request based stacking or DM drivers.  They are a major
pain to deal with, and adding more with different requirements then
dm-multipath is not helping in actually making that one work properly.