From: Jonathan Brassow <jbrassow@redhat.com>
Date: Thu, 13 Jan 2011 19:59:52 +0000 (+0000)
Subject: dm log userspace: add version number to comms
X-Git-Tag: v2.6.38-rc1~221^2~20
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=86a54a4802df10d23ccd655e2083e812fe990243;p=pandora-kernel.git

dm log userspace: add version number to comms

This patch adds a 'version' field to the 'dm_ulog_request'
structure.

The 'version' field is taken from a portion of the unused
'padding' field in the 'dm_ulog_request' structure.  This
was done to avoid changing the size of the structure and
possibly disrupting backwards compatibility.

The version number will help notify user-space daemons
when a change has been made to the kernel/userspace
log API.

Signed-off-by: Jonathan Brassow <jbrassow@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
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