Merge tag 'nfsd-6.2-2' of git://git.kernel.org/pub/scm/linux/kernel/g…

…it/cel/linux

Pull nfsd fixes from Chuck Lever:

 - Fix a filecache UAF during NFSD shutdown

 - Avoid exposing automounted mounts on NFS re-exports

* tag 'nfsd-6.2-2' of git://git.kernel.org/pub/scm/linux/kernel/git/cel/linux:
  nfsd: fix handling of readdir in v4root vs. mount upcall timeout
  nfsd: shut down the NFSv4 state objects before the filecache

fs/nfsd/nfs4xdr.c

@@ -3629,6 +3629,17 @@ nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
 	case nfserr_noent:
 		xdr_truncate_encode(xdr, start_offset);
 		goto skip_entry;
+	case nfserr_jukebox:
+		/*
+		 * The pseudoroot should only display dentries that lead to
+		 * exports. If we get EJUKEBOX here, then we can't tell whether
+		 * this entry should be included. Just fail the whole READDIR
+		 * with NFS4ERR_DELAY in that case, and hope that the situation
+		 * will resolve itself by the client's next attempt.
+		 */
+		if (cd->rd_fhp->fh_export->ex_flags & NFSEXP_V4ROOT)
+			goto fail;
+		fallthrough;
 	default:
 		/*
 		 * If the client requested the RDATTR_ERROR attribute,

fs/nfsd/nfssvc.c

@@ -453,8 +453,8 @@ static void nfsd_shutdown_net(struct net *net)
 {
 	struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 
-	nfsd_file_cache_shutdown_net(net);
 	nfs4_state_shutdown_net(net);
+	nfsd_file_cache_shutdown_net(net);
 	if (nn->lockd_up) {
 		lockd_down(net);
 		nn->lockd_up = false;