From: Keir Fraser <keir.fraser@citrix.com>
Date: Thu, 21 Jan 2010 14:39:05 +0000 (+0000)
Subject: blkback: Flush blkback data when connecting.
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=35ec9d9f16dd000e9b9119b193ce20bf72f58127;p=legacy%2Flinux-2.6.18-xen.git

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.

Signed-off-by: Chris Lalancette <clalance@redhat.com>
---

diff --git a/drivers/xen/blkback/xenbus.c b/drivers/xen/blkback/xenbus.c
index 6a5669e9..82fa267c 100644
--- a/drivers/xen/blkback/xenbus.c
+++ b/drivers/xen/blkback/xenbus.c
@@ -88,6 +88,13 @@ 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);