mnt: Move the clear of MNT_LOCKED from copy_tree to it's callers.
authorEric W. Biederman <ebiederm@xmission.com>
Tue, 7 Oct 2014 23:22:52 +0000 (16:22 -0700)
committerEric W. Biederman <ebiederm@xmission.com>
Tue, 2 Dec 2014 16:46:50 +0000 (10:46 -0600)
Clear MNT_LOCKED in the callers of copy_tree except copy_mnt_ns, and
collect_mounts.  In copy_mnt_ns it is necessary to create 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@xmission.com>
fs/namespace.c
fs/pnode.c

index 15d0328..e8d1ffa 100644 (file)
@@ -1613,7 +1613,6 @@ 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;
index aae331a..260ac8f 100644 (file)
@@ -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;