ovl: make private mounts longterm

[sfrench/cifs-2.6.git] / fs / namespace.c

diff --git a/fs/namespace.c b/fs/namespace.c
index a28e4db075ede216f684561fbc348a01670560a9..d53517f1d7417163f84f15c8b4c105e4d6f4a246 100644 (file)
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -1879,6 +1879,9 @@ struct vfsmount *clone_private_mount(const struct path *path)
        if (IS_ERR(new_mnt))
                return ERR_CAST(new_mnt);
 
+       /* Longterm mount to be removed by kern_unmount*() */
+       new_mnt->mnt_ns = MNT_NS_INTERNAL;
+
        return &new_mnt->mnt;
 }
 EXPORT_SYMBOL_GPL(clone_private_mount);
@@ -3804,6 +3807,19 @@ void kern_unmount(struct vfsmount *mnt)
 }
 EXPORT_SYMBOL(kern_unmount);
 
+void kern_unmount_array(struct vfsmount *mnt[], unsigned int num)
+{
+       unsigned int i;
+
+       for (i = 0; i < num; i++)
+               if (mnt[i])
+                       real_mount(mnt[i])->mnt_ns = NULL;
+       synchronize_rcu_expedited();
+       for (i = 0; i < num; i++)
+               mntput(mnt[i]);
+}
+EXPORT_SYMBOL(kern_unmount_array);
+
 bool our_mnt(struct vfsmount *mnt)
 {
        return check_mnt(real_mount(mnt));