From: Alasdair G Kergon <agk@redhat.com>
To: Andy Whitcroft <apw@canonical.com>
Cc: Alasdair Kergon <agk@redhat.com>,
Mike Snitzer <snitzer@redhat.com>, Christoph Hellwig <hch@lst.de>,
mohan_srinivasan@yahoo.com, dm-devel@redhat.com,
Neil Brown <neilb@suse.com>,
linux-raid@vger.kernel.org, linux-kernel@vger.kernel.org,
Tim Gardner <tim.gardner@canonical.com>
Subject: Re: reinstate dm target local ioctl support
Date: Fri, 29 Jan 2016 13:57:12 +0000 [thread overview]
Message-ID: <20160129135712.GA7201@agk-dp.fab.redhat.com> (raw)
In-Reply-To: <1453989019-24300-1-git-send-email-apw@canonical.com>
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
next prev parent reply other threads:[~2016-01-29 13:57 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-28 13:50 reinstate dm target local ioctl support Andy Whitcroft
2016-01-28 14:00 ` Christoph Hellwig
2016-01-29 13:55 ` [dm-devel] " Joe Thornber
2016-01-29 13:57 ` Alasdair G Kergon [this message]
2016-01-29 14:35 ` Andy Whitcroft
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