On 01/14/11 00:03, Milan Broz wrote:

On 01/13/2011 03:43 PM, Kay Sievers wrote:

quoted

quoted

On Thu, Jan 13, 2011 at 3:25 PM, Milan Broz [off-list ref] wrote:

quoted

Maybe, but this was not invented in DM/MD camp:-)
Probably Kay or Greg can answer why it was done this way?

It's not from Greg or Kay. It just appeared some day in the context of dm. :)

ah, then sorry, I am just confused:-)
But DM does not need it for operation at all so it must had some other reason.
(We have dmsetup ls --tree using dm-ioctls for years.)

Sorry. It's from me 5 years ago. :)

See this for backgrounds:
  [PATCH 0/3] sysfs representation of stacked devices (dm/md)
  http://lwn.net/Articles/172689/

And I don't adhere to my implementation if there's better one.

Thanks,
-- 
Jun'ichi Nomura, NEC Corporation