diff --git a/fs/nfs/fs_context.c b/fs/nfs/fs_context.c
index c105882edd16..1967de7d1dff 100644
--- a/fs/nfs/fs_context.c
+++ b/fs/nfs/fs_context.c
@@ -1769,7 +1769,9 @@ struct file_system_type nfs_fs_type = {
 	.init_fs_context	= nfs_init_fs_context,
 	.parameters		= nfs_fs_parameters,
 	.kill_sb		= nfs_kill_super,
-	.fs_flags		= FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
+	.fs_flags		= FS_RENAME_DOES_D_MOVE	|
+				  FS_BINARY_MOUNTDATA	|
+				  FS_USERNS_DELEGATABLE,
 };
 MODULE_ALIAS_FS("nfs");
 EXPORT_SYMBOL_GPL(nfs_fs_type);
@@ -1781,7 +1783,9 @@ struct file_system_type nfs4_fs_type = {
 	.init_fs_context	= nfs_init_fs_context,
 	.parameters		= nfs_fs_parameters,
 	.kill_sb		= nfs_kill_super,
-	.fs_flags		= FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
+	.fs_flags		= FS_RENAME_DOES_D_MOVE	|
+				  FS_BINARY_MOUNTDATA	|
+				  FS_USERNS_DELEGATABLE,
 };
 MODULE_ALIAS_FS("nfs4");
 MODULE_ALIAS("nfs4");
diff --git a/fs/super.c b/fs/super.c
index 5d46a0d5b616..d254105e29b2 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -741,12 +741,13 @@ struct super_block *sget_fc(struct fs_context *fc,
 	int err;
 
 	/*
-	 * Never allow s_user_ns != &init_user_ns when FS_USERNS_MOUNT is
-	 * not set, as the filesystem is likely unprepared to handle it.
-	 * This can happen when fsconfig() is called from init_user_ns with
-	 * an fs_fd opened in another user namespace.
+	 * Never allow s_user_ns != &init_user_ns when FS_USERNS_MOUNT or
+	 * FS_USERNS_DELEGATABLE is not set, as the filesystem is likely
+	 * unprepared to handle it. This can happen when fsconfig() is called
+	 * from init_user_ns with an fs_fd opened in another user namespace.
 	 */
-	if (user_ns != &init_user_ns && !(fc->fs_type->fs_flags & FS_USERNS_MOUNT)) {
+	if (user_ns != &init_user_ns &&
+	    !(fc->fs_type->fs_flags & (FS_USERNS_MOUNT | FS_USERNS_DELEGATABLE))) {
 		errorfc(fc, "VFS: Mounting from non-initial user namespace is not allowed");
 		return ERR_PTR(-EPERM);
 	}
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 11559c513dfb..10d35a68f597 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2281,6 +2281,7 @@ struct file_system_type {
 #define FS_MGTIME		64	/* FS uses multigrain timestamps */
 #define FS_LBS			128	/* FS supports LBS */
 #define FS_POWER_FREEZE		256	/* Always freeze on suspend/hibernate */
+#define FS_USERNS_DELEGATABLE	1024	/* Can be mounted inside userns from outside */
 #define FS_RENAME_DOES_D_MOVE	32768	/* FS will handle d_move() during rename() internally. */
 	int (*init_fs_context)(struct fs_context *);
 	const struct fs_parameter_spec *parameters;