--- zzzz-none-000/linux-4.4.60/fs/ext4/inode.c	2017-04-08 07:53:53.000000000 +0000
+++ scorpion-1750e-727/linux-4.4.60/fs/ext4/inode.c	2021-02-04 17:41:59.000000000 +0000
@@ -3674,6 +3674,7 @@
 
 int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length)
 {
+#if 0
 	struct super_block *sb = inode->i_sb;
 	ext4_lblk_t first_block, stop_block;
 	struct address_space *mapping = inode->i_mapping;
@@ -3802,6 +3803,12 @@
 out_mutex:
 	mutex_unlock(&inode->i_mutex);
 	return ret;
+#else
+	/*
+	 * Disabled as per b/28760453
+	 */
+	return -EOPNOTSUPP;
+#endif
 }
 
 int ext4_inode_attach_jinode(struct inode *inode)
@@ -3969,7 +3976,8 @@
 	int			inodes_per_block, inode_offset;
 
 	iloc->bh = NULL;
-	if (!ext4_valid_inum(sb, inode->i_ino))
+	if (inode->i_ino < EXT4_ROOT_INO ||
+	    inode->i_ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
 		return -EFSCORRUPTED;
 
 	iloc->block_group = (inode->i_ino - 1) / EXT4_INODES_PER_GROUP(sb);