diff --git a/fs/fuse/backing.c b/fs/fuse/backing.c
index f7629c0f096c..c1e57a06c469 100644
--- a/fs/fuse/backing.c
+++ b/fs/fuse/backing.c
@@ -797,6 +797,10 @@ int fuse_file_write_iter_backing(struct fuse_args *fa,
 	/* TODO This just plain ignores any change to fuse_write_in */
 	fwo->size = vfs_iter_write(ff->backing_file, from, &iocb->ki_pos, 0);
 
+	/* Must reflect change in size of backing file to upper file */
+	if (fwo->size > 0)
+		fuse_copyattr(file, ff->backing_file);
+
 	if (fwo->size < 0)
 		return fwo->size;
 	return 0;
diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
index 50784f39cba8..675db33e9c0c 100644
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -1299,6 +1299,7 @@ bool fuse_dax_check_alignment(struct fuse_conn *fc, unsigned int map_alignment);
 void fuse_dax_cancel_work(struct fuse_conn *fc);
 
 /* passthrough.c */
+void fuse_copyattr(struct file *dst_file, struct file *src_file);
 int fuse_passthrough_open(struct fuse_dev *fud, u32 lower_fd);
 int fuse_passthrough_setup(struct fuse_conn *fc, struct fuse_file *ff,
 			   struct fuse_open_out *openarg);
diff --git a/fs/fuse/passthrough.c b/fs/fuse/passthrough.c
index 83125de0bfdc..6031e72f3b5a 100644
--- a/fs/fuse/passthrough.c
+++ b/fs/fuse/passthrough.c
@@ -34,7 +34,7 @@ static void fuse_file_accessed(struct file *dst_file, struct file *src_file)
 	touch_atime(&dst_file->f_path);
 }
 
-static void fuse_copyattr(struct file *dst_file, struct file *src_file)
+void fuse_copyattr(struct file *dst_file, struct file *src_file)
 {
 	struct inode *dst = file_inode(dst_file);
 	struct inode *src = file_inode(src_file);