add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/fs/nfsd/nfsctl.c
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@@ -1417,6 +1417,8 @@
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 {
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 	struct net *net = sb->s_fs_info;
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+	nfsd_shutdown_threads(net);
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+
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 	kill_litter_super(sb);
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 	put_net(net);
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 }
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@@ -1428,18 +1430,6 @@
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 	.kill_sb	= nfsd_umount,
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 };
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 MODULE_ALIAS_FS("nfsd");
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-
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-int get_nfsdfs(struct net *net)
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-{
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-	struct nfsd_net *nn = net_generic(net, nfsd_net_id);
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-	struct vfsmount *mnt;
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-
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-	mnt =  vfs_kern_mount(&nfsd_fs_type, SB_KERNMOUNT, "nfsd", NULL);
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-	if (IS_ERR(mnt))
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-		return PTR_ERR(mnt);
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-	nn->nfsd_mnt = mnt;
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-	return 0;
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-}
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 #ifdef CONFIG_PROC_FS
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 static int create_proc_exports_entry(void)