linux-kernel - [PATCH] Fix a simple issue w.r.t mounting of containers

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Date:	Fri, 18 May 2007 18:09:16 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	Paul Menage <menage@...gle.com>
Cc:	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Paul Jackson <pj@....com>, LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH] Fix a simple issue w.r.t mounting of containers



Fix containers mounting issue. With the current v9 patches if a container
hierarchy is mounted and then umounted. A second mount of the hierarchy
fails

Steps to reproduce the problem

1. mount -t container container /<mnt point>
2. umount /<mnt point>
3. mount -t container container /<mnt point>

Step 3 fails with -EBUSY. This is due to the fact that when we unmount,
in container_put_super(), we need to delete the current root from the roots
list.

The patch below fixes the issue


Signed-off-by: Balbir Singh <balbir@...ux.vnet.ibm.com>
---

 kernel/container.c |    1 +
 1 file changed, 1 insertion(+)

diff -puN kernel/container.c~fix-remount-issue kernel/container.c
--- linux-2.6.21-mm1/kernel/container.c~fix-remount-issue	2007-05-18 17:59:40.000000000 +0530
+++ linux-2.6.21-mm1-balbir/kernel/container.c	2007-05-18 18:00:02.000000000 +0530
@@ -574,6 +574,7 @@ static void container_put_super(struct s
 	ret = rebind_subsystems(root, 0);
 	BUG_ON(ret);
 
+	list_del(&root->root_list);
 	kfree(root);
 	mutex_unlock(&container_mutex);
 }
_

-- 
	Warm Regards,
	Balbir Singh
	Linux Technology Center
	IBM, ISTL
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