Re: [dm-devel] [PATCH 1/2] dm: update max_io_len to support a split_io that is not a power of 2

[Alasdair G Kergon <agk redhat com>]

On Sat, Apr 28, 2012 at 12:44:28AM -0400, Mike Snitzer wrote:
> Required to support a target's use of a non power of 2 blocksize.
 
For which targets?
(merge_bvec supported?)

> +		boundary = ti->split_io - do_div(tmp, ti->split_io);

sector_div()?

What about 32-bit arch + LBD + large split_io (from raid?)
  - Is a 32-bit restriction on split_io unreasonable nowadays?
    - OR reasonable on 32bit/LBD?
    - OR fallback to old code there?

Alasdair