File 0023-compat-genetlink-remove-userhdr-from-struct-genl_inf.patch of Package drbd.36406

From 1412792a443ddc696fd1c8981a6cc544272f54bf Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Moritz=20WanzenBug=20Wanzenb=C3=B6ck?=
 <moritz.wanzenboeck@linbit.com>
Date: Wed, 13 Sep 2023 15:46:12 +0200
Subject: [PATCH] compat: genetlink: remove userhdr from struct genl_info

See also upstream Linux kernel commit
bffcc6882a1b ("genetlink: remove userhdr from struct genl_info")

Original message:

Only three families use info->userhdr today and going forward
we discourage using fixed headers in new families.
So having the pointer to user header in struct genl_info
is an overkill. Compute the header pointer at runtime.
---
 .../cocci/genl_info_userhdr__no_present.cocci              | 5 +++++
 drbd/drbd-kernel-compat/gen_patch_names.c                  | 3 +++
 drbd/drbd-kernel-compat/tests/have_genl_info_userhdr.c     | 7 +++++++
 drbd/drbd_nl.c                                             | 6 +++---
 4 files changed, 18 insertions(+), 3 deletions(-)
 create mode 100644 drbd/drbd-kernel-compat/cocci/genl_info_userhdr__no_present.cocci
 create mode 100644 drbd/drbd-kernel-compat/tests/have_genl_info_userhdr.c

diff --git a/drbd/drbd-kernel-compat/cocci/genl_info_userhdr__no_present.cocci b/drbd/drbd-kernel-compat/cocci/genl_info_userhdr__no_present.cocci
new file mode 100644
index 000000000000..75e787797068
--- /dev/null
+++ b/drbd/drbd-kernel-compat/cocci/genl_info_userhdr__no_present.cocci
@@ -0,0 +1,5 @@
+@@
+expression info;
+@@
+- genl_info_userhdr(info)
++ info->userhdr
diff --git a/drbd/drbd-kernel-compat/gen_patch_names.c b/drbd/drbd-kernel-compat/gen_patch_names.c
index e4a65a3c451e..b136acf3148a 100644
--- a/drbd/drbd-kernel-compat/gen_patch_names.c
+++ b/drbd/drbd-kernel-compat/gen_patch_names.c
@@ -574,6 +574,9 @@ int main(int argc, char **argv)
 	patch(1, "blk_mode_t", true, false,
 	      COMPAT_HAVE_BLK_MODE_T, "present");
 
+	patch(1, "genl_info_userhdr", true, false,
+	      COMPAT_HAVE_GENL_INFO_USERHDR, "present");
+
 /* #define BLKDEV_ISSUE_ZEROOUT_EXPORTED */
 /* #define BLKDEV_ZERO_NOUNMAP */
 
diff --git a/drbd/drbd-kernel-compat/tests/have_genl_info_userhdr.c b/drbd/drbd-kernel-compat/tests/have_genl_info_userhdr.c
new file mode 100644
index 000000000000..3c69dacce244
--- /dev/null
+++ b/drbd/drbd-kernel-compat/tests/have_genl_info_userhdr.c
@@ -0,0 +1,7 @@
+/* { "version": "v6.6-rc1", "commit": "bffcc6882a1bb2be8c9420184966f4c2c822078e", "comment": "genetlink: remove userhdr from struct genl_info", "author": "Jakub Kicinski <kuba@kernel.org>", "date": "Mon Aug 14 14:47:16 2023 -0700" } */
+#include <net/genetlink.h>
+
+void *foo(struct genl_info *info)
+{
+	return genl_info_userhdr(info);
+}
diff --git a/drbd/drbd_nl.c b/drbd/drbd_nl.c
index 71ed4272614e..538c31202e4b 100644
--- a/drbd/drbd_nl.c
+++ b/drbd/drbd_nl.c
@@ -203,7 +203,7 @@ static struct drbd_path *first_path(struct drbd_connection *connection)
 static int drbd_adm_prepare(struct drbd_config_context *adm_ctx,
 	struct sk_buff *skb, struct genl_info *info, unsigned flags)
 {
-	struct drbd_genlmsghdr *d_in = info->userhdr;
+	struct drbd_genlmsghdr *d_in = genl_info_userhdr(info);
 	const u8 cmd = info->genlhdr->cmd;
 	int err;
 
@@ -2106,7 +2106,7 @@ static void drbd_try_suspend_al(struct drbd_device *device)
 
 static bool should_set_defaults(struct genl_info *info)
 {
-	unsigned flags = ((struct drbd_genlmsghdr*)info->userhdr)->flags;
+	unsigned int flags = ((struct drbd_genlmsghdr *)genl_info_userhdr(info))->flags;
 	return 0 != (flags & DRBD_GENL_F_SET_DEFAULTS);
 }
 
@@ -6279,7 +6279,7 @@ out_no_unlock:
 int drbd_adm_new_minor(struct sk_buff *skb, struct genl_info *info)
 {
 	struct drbd_config_context adm_ctx;
-	struct drbd_genlmsghdr *dh = info->userhdr;
+	struct drbd_genlmsghdr *dh = genl_info_userhdr(info);
 	struct device_conf device_conf;
 	struct drbd_resource *resource;
 	struct drbd_device *device;
-- 
2.42.1