vfs_rename() was changed in 5.10.220, see:
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=linux-5.10.y&id=e864d4d834f820c8be01c9d048cdab6051fe3932

--- a/vfs.c
+++ b/vfs.c
@@ -1074,12 +1074,18 @@ static int __ksmbd_vfs_rename(struct ksm
 
 	err = -ENOTEMPTY;
 	if (dst_dent != trap_dent && !d_really_is_positive(dst_dent)) {
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 12, 0)
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 12, 0) || \
+	(LINUX_VERSION_CODE >= KERNEL_VERSION(5, 10, 220) && \
+	 LINUX_VERSION_CODE < KERNEL_VERSION(5, 11, 0))
 		struct renamedata rd = {
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 12, 0)
 			.old_mnt_userns	= src_user_ns,
+#endif
 			.old_dir	= d_inode(src_dent_parent),
 			.old_dentry	= src_dent,
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 12, 0)
 			.new_mnt_userns	= dst_user_ns,
+#endif
 			.new_dir	= d_inode(dst_dent_parent),
 			.new_dentry	= dst_dent,
 		};