nfsd: don't allow legacy client tracker init for anything but init_net

This code isn't set up for containers, so don't allow it to be
used for anything but init_net.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/fs/nfsd/nfs4recover.c b/fs/nfsd/nfs4recover.c
index 6f13281635ba..21b53d57432c 100644
--- a/fs/nfsd/nfs4recover.c
+++ b/fs/nfsd/nfs4recover.c
@@ -416,6 +416,13 @@ nfsd4_load_reboot_recovery_data(struct net *net)
 {
         int status;
 
+        /* XXX: The legacy code won't work in a container */
+        if (net != &init_net) {
+                WARN(1, KERN_ERR "NFSD: attempt to initialize legacy client "
+                        "tracking in a container!\n");
+                return -EINVAL;
+        }
+
         nfs4_lock_state();
         status = nfsd4_init_recdir();
         if (!status)