linux-kernel - Re: reinstate dm target local ioctl support

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Message-ID: <20160129135712.GA7201@agk-dp.fab.redhat.com>
Date:	Fri, 29 Jan 2016 13:57:12 +0000
From:	Alasdair G Kergon <agk@...hat.com>
To:	Andy Whitcroft <apw@...onical.com>
Cc:	Alasdair Kergon <agk@...hat.com>,
	Mike Snitzer <snitzer@...hat.com>,
	Christoph Hellwig <hch@....de>, mohan_srinivasan@...oo.com,
	dm-devel@...hat.com, Neil Brown <neilb@...e.com>,
	linux-raid@...r.kernel.org, linux-kernel@...r.kernel.org,
	Tim Gardner <tim.gardner@...onical.com>
Subject: Re: reinstate dm target local ioctl support

On Thu, Jan 28, 2016 at 01:50:19PM +0000, Andy Whitcroft wrote:
> However this also removed the possibility of a dm target having target
> specific ioctls.  Currently this is not used by any in-tree targets but
> was utilised by the flashcache out-of-tree module.
 
What data is being passed in and out?

The method we support is passing it through DM_TARGET_MSG (as text).
For examples look at dm-switch.c and dm-stats.c, which handled
pretty large quantities of data.

Would that work?

Alasdair