docker/0003-BUILD-SLE12-revert-graphdriver-btrfs-use-kernel-UAPI.patch

From 3613734aeb6eacd45e53dfd834f46dc006ba0047 Mon Sep 17 00:00:00 2001
From: Aleksa Sarai <asarai@suse.de>
Date: Mon, 22 May 2023 15:44:54 +1000
Subject: [PATCH 3/5] BUILD: SLE12: revert "graphdriver/btrfs: use kernel UAPI
 headers"

This reverts commit 3208dcabdc8997340b255f5b880fef4e3f54580d.

On SLE 12, our UAPI headers are too old, resulting in us being unable to
build the btrfs driver with the new headers. This patch is only needed
for SLE-12.

Signed-off-by: Aleksa Sarai <cyphar@cyphar.com>
---
 daemon/graphdriver/btrfs/btrfs.go | 13 ++++---------
 1 file changed, 4 insertions(+), 9 deletions(-)

diff --git a/daemon/graphdriver/btrfs/btrfs.go b/daemon/graphdriver/btrfs/btrfs.go
index 61f22ed2dd49..330571e3c047 100644
--- a/daemon/graphdriver/btrfs/btrfs.go
+++ b/daemon/graphdriver/btrfs/btrfs.go
@@ -4,17 +4,12 @@ package btrfs // import "github.com/docker/docker/daemon/graphdriver/btrfs"
 
 /*
 #include <stdlib.h>
-#include <stdio.h>
 #include <dirent.h>
 
-#include <linux/version.h>
-#if LINUX_VERSION_CODE < KERNEL_VERSION(4,12,0)
-    #error "Headers from kernel >= 4.12 are required to build with Btrfs support."
-    #error "HINT: Set 'DOCKER_BUILDTAGS=exclude_graphdriver_btrfs' to build without Btrfs."
-#endif
-
-#include <linux/btrfs.h>
-#include <linux/btrfs_tree.h>
+// keep struct field name compatible with btrfs-progs < 6.1.
+#define max_referenced max_rfer
+#include <btrfs/ioctl.h>
+#include <btrfs/ctree.h>
 
 static void set_name_btrfs_ioctl_vol_args_v2(struct btrfs_ioctl_vol_args_v2* btrfs_struct, const char* value) {
     snprintf(btrfs_struct->name, BTRFS_SUBVOL_NAME_MAX, "%s", value);
-- 
2.47.1