From: Chris Lalancette <clalance@redhat.com>
Date: Wed, 21 Jul 2010 19:41:45 +0000 (-0700)
Subject: xen/blkback: Flush blkback data when connecting.
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=cbf462908c8080f47c2a3300072877589dd1275f;p=linux-beck.git

xen/blkback: Flush blkback data when connecting.

First cut at flushing blkback data when first connecting
blkback.  This should avoid the pygrub issues we are experiencing
in (RedHat bugzilla) 466681.

[ 2.6.18-xen.hg commit 63b4d7f56688 ]

Signed-off-by: Chris Lalancette <clalance@redhat.com>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
---

diff --git a/drivers/xen/blkback/xenbus.c b/drivers/xen/blkback/xenbus.c
index c31e5c40b45c..a0534fc6a428 100644
--- a/drivers/xen/blkback/xenbus.c
+++ b/drivers/xen/blkback/xenbus.c
@@ -91,6 +91,13 @@ static void update_blkif_status(blkif_t *blkif)
 		return;
 	}
 
+	err = filemap_write_and_wait(blkif->vbd.bdev->bd_inode->i_mapping);
+	if (err) {
+		xenbus_dev_error(blkif->be->dev, err, "block flush");
+		return;
+	}
+	invalidate_inode_pages2(blkif->vbd.bdev->bd_inode->i_mapping);
+
 	blkif->xenblkd = kthread_run(blkif_schedule, blkif, name);
 	if (IS_ERR(blkif->xenblkd)) {
 		err = PTR_ERR(blkif->xenblkd);