From: Mikulas Patocka <mpatocka@redhat.com>
Date: Fri, 1 Mar 2013 22:45:49 +0000 (+0000)
Subject: dm ioctl: allow message to return data
X-Git-Tag: v3.9-rc1~19^2~10
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a26062416ef8add48f16fbadded2b5f6fb84d024;p=pandora-kernel.git

dm ioctl: allow message to return data

This patch introduces enhanced message support that allows the
device-mapper core to recognise messages that are common to all devices,
and for messages to return data to userspace.

Core messages are processed by the function "message_for_md".  If the
device mapper doesn't support the message, it is passed to the target
driver.

If the message returns data, the kernel sets the flag
DM_MESSAGE_OUT_FLAG.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
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