--- zzzz-none-000/linux-5.4.213/fs/nfsd/export.c	2022-09-15 10:04:56.000000000 +0000
+++ miami-7690-761/linux-5.4.213/fs/nfsd/export.c	2024-05-29 11:20:02.000000000 +0000
@@ -386,8 +386,7 @@
 		return -EINVAL;
 	}
 
-	if (!inode->i_sb->s_export_op ||
-	    !inode->i_sb->s_export_op->fh_to_dentry) {
+	if (!exportfs_can_decode_fh(inode->i_sb->s_export_op)) {
 		dprintk("exp_export: export of invalid fs type.\n");
 		return -EINVAL;
 	}