From 9039cf5c5da439f6c65435c0a2b9ae16989940e1 Mon Sep 17 00:00:00 2001
From: Lukas Czerner <lczerner@redhat.com>
Date: Tue, 14 Jan 2020 20:56:41 +0100
Subject: [PATCH 7/7] ext2fs: fix ABI change in the struct_ext2_filsys
 structure

Upstream increased size of the struct_ext2_filsys structure by adding
new encoding member. However this represents ABI breakage within a major
RHEL release. To avoid it use some of the reserved space in the
struct_ext2_filsys structure.

Signed-off-by: Lukas Czerner <lczerner@redhat.com>
---
 lib/ext2fs/ext2fs.h | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/lib/ext2fs/ext2fs.h b/lib/ext2fs/ext2fs.h
index ba83534c..32c75171 100644
--- a/lib/ext2fs/ext2fs.h
+++ b/lib/ext2fs/ext2fs.h
@@ -250,10 +250,17 @@ struct struct_ext2_filsys {
 	int				cluster_ratio_bits;
 	__u16				default_bitmap_type;
 	__u16				pad;
+
+	/*
+	 * RedHat specific change to prevent ABI change by using 8
+	 * reserved bytes
+	 */
+	const struct ext2fs_nls_table *encoding;
+
 	/*
 	 * Reserved for future expansion
 	 */
-	__u32				reserved[5];
+	__u32				reserved[5 - (sizeof(long int)/4)];
 
 	/*
 	 * Reserved for the use of the calling application.
@@ -304,8 +311,6 @@ struct struct_ext2_filsys {
 
 	/* hashmap for SHA of data blocks */
 	struct ext2fs_hashmap* block_sha_map;
-
-	const struct ext2fs_nls_table *encoding;
 };
 
 #if EXT2_FLAT_INCLUDES
-- 
2.21.3