From 28480f0f48fc7fd4fe408934cb6e553743e16fd1 Mon Sep 17 00:00:00 2001
From: Flavien Quesnel <flavien.quesnel@citrix.com>
Date: Tue, 9 Sep 2014 17:50:06 +0100
Subject: [PATCH] Document how to enable verbose log messages for tapback

Signed-off-by: Flavien Quesnel <flavien.quesnel@citrix.com>
---
 README | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/README b/README
index 5e410803..37980e9e 100644
--- a/README
+++ b/README
@@ -118,5 +118,20 @@ xm block-attach 0 tap:qcow:<FILENAME> /dev/xvda1 w 0
 mount /dev/xvda1 /mnt/disk
 
 
+Enabling verbose log messages for tapback
+=========================================
+
+As of blktap3, the establishment of a connection between blkfront and a tap
+disk is handled by tapback.
+
+When needed, tapback can be configured to print verbose log messages. To do
+that, edit /etc/init.d/tapback and ensure tapback is started with the '-v'
+option, like this:
+
+${TAPBACK} -v -p ${PID_FILE} >/dev/null 2>&1 </dev/null
+
+Then, restart the tapback service:
+
+service tapback restart