--- x/fs/fuse/file.c
+++ f/fs/fuse/file.c
@@ -3001,7 +3001,11 @@ static long fuse_file_fallocate(struct f
 			goto out;
 	}
 
+	if (!lock_inode)
+		inode_lock(inode);
 	err = file_modified(file);
+	if (!lock_inode)
+		inode_unlock(inode);
 	if (err)
 		goto out;