linux-kernel - [PATCH] mnt: Move the clear of MNT_LOCKED from copy

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Date:	Tue, 07 Oct 2014 16:40:10 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Andrew Vagin <avagin@...allels.com>
Cc:	Al Viro <viro@...IV.linux.org.uk>,
	Andrey Vagin <avagin@...nvz.org>,
	<linux-fsdevel@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	Serge Hallyn <serge.hallyn@...onical.com>
Subject: [PATCH] mnt: Move the clear of MNT_LOCKED from copy_tree to it's


Clear MNT_LOCKED in the callers of copy_tree except copy_mnt_ns, and
collect_mounts.  In copy_mnt_nswe want an exact copy of a mount tree,
so not clearing MNT_LOCKED is important.  Similarly collect_mounts
is used to take a snapshot of the mount tree for audit logging purposes
and auditing using a faithful copy of the tree is important.

This becomes particularly significant when we start setting MNT_LOCKED
on rootfs to prevent it from being unmounted.

Signed-off-by: "Eric W. Biederman" <ebiederm@...ssion.com>
---
 fs/namespace.c | 1 -
 fs/pnode.c     | 1 +
 2 files changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/namespace.c b/fs/namespace.c
index 9c6ee037bef7..5a11e273541c 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -1498,7 +1498,6 @@ struct mount *copy_tree(struct mount *mnt, struct dentry *dentry,
 	if (IS_ERR(q))
 		return q;
 
-	q->mnt.mnt_flags &= ~MNT_LOCKED;
 	q->mnt_mountpoint = mnt->mnt_mountpoint;
 
 	p = mnt;
diff --git a/fs/pnode.c b/fs/pnode.c
index aae331a5d03b..260ac8f898a4 100644
--- a/fs/pnode.c
+++ b/fs/pnode.c
@@ -242,6 +242,7 @@ static int propagate_one(struct mount *m)
 	child = copy_tree(last_source, last_source->mnt.mnt_root, type);
 	if (IS_ERR(child))
 		return PTR_ERR(child);
+	child->mnt.mnt_flags &= ~MNT_LOCKED;
 	mnt_set_mountpoint(m, mp, child);
 	last_dest = m;
 	last_source = child;
-- 
1.9.1

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