File 0044-LU-15420-llite-add-rcu-argument-to-get_acl-callback.patch of Package lustre_2_12

From 085311dc739903f751d11dc4244aea6316ccb7bd Mon Sep 17 00:00:00 2001
From: Jian Yu <yujian@whamcloud.com>
Date: Mon, 24 Jan 2022 21:51:02 -0800
Subject: [PATCH] LU-15420 llite: add rcu argument to ->get_acl() callback

Kernel 5.15 commit 0cad6246621b5887d5b33fea84219d2a71f2f99a
added a rcu argument to the ->get_acl() callback.

Test-Parameters: trivial
Change-Id: Icd711b38dda1a5a3c56bd631fa2edd94eab3572c
Signed-off-by: Jian Yu <yujian@whamcloud.com>
Reviewed-on: https://review.whamcloud.com/46086
Tested-by: jenkins <devops@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Oleg Drokin <green@whamcloud.com>
---
 lustre/autoconf/lustre-core.m4 |   26 ++++++++++++++++++++++++++
 lustre/llite/file.c            |   11 ++++++++++-
 lustre/llite/llite_internal.h  |    6 +++++-
 3 files changed, 41 insertions(+), 2 deletions(-)

--- a/lustre/autoconf/lustre-core.m4
+++ b/lustre/autoconf/lustre-core.m4
@@ -2334,6 +2334,29 @@ user_namespace_argument, [
 EXTRA_KCFLAGS="$tmp_flags"
 ]) # LC_HAVE_USER_NAMESPACE_ARG
 
+#
+# LC_HAVE_GET_ACL_RCU_ARG
+#
+# kernel 5.15 commit 0cad6246621b5887d5b33fea84219d2a71f2f99a
+# vfs: add rcu argument to ->get_acl() callback
+# Add a rcu argument to the ->get_acl() callback to allow
+# get_cached_acl_rcu() to call the ->get_acl() method.
+#
+AC_DEFUN([LC_HAVE_GET_ACL_RCU_ARG], [
+tmp_flags="$EXTRA_KCFLAGS"
+EXTRA_KCFLAGS="-Werror"
+LB_CHECK_COMPILE([if 'get_acl' has a rcu argument],
+get_acl_rcu_argument, [
+	#include <linux/fs.h>
+],[
+	((struct inode_operations *)1)->get_acl((struct inode *)NULL, 0, false);
+],[
+	AC_DEFINE(HAVE_GET_ACL_RCU_ARG, 1,
+		['get_acl' has a rcu argument])
+])
+EXTRA_KCFLAGS="$tmp_flags"
+]) # LC_HAVE_GET_ACL_RCU_ARG
+
 AC_DEFUN([LC_PROG_LINUX_SRC], [])
 AC_DEFUN([LC_PROG_LINUX_RESULTS], [])
 
@@ -3533,6 +3556,9 @@ AC_DEFUN([LC_PROG_LINUX], [
 	# 5.10
 	LC_FORCE_UACCESS_BEGIN
 
+	# 5.15
+	LC_HAVE_GET_ACL_RCU_ARG
+
 	# kernel patch to extend integrity interface
 	LC_BIO_INTEGRITY_PREP_FN
 
--- a/lustre/llite/file.c
+++ b/lustre/llite/file.c
@@ -4610,12 +4610,21 @@ out:
 	return rc;
 }
 
-struct posix_acl *ll_get_acl(struct inode *inode, int type)
+struct posix_acl *ll_get_acl(struct inode *inode, int type
+#ifdef HAVE_GET_ACL_RCU_ARG
+			     , bool rcu
+#endif /* HAVE_GET_ACL_RCU_ARG */
+			    )
 {
 	struct ll_inode_info *lli = ll_i2info(inode);
 	struct posix_acl *acl = NULL;
 	ENTRY;
 
+#ifdef HAVE_GET_ACL_RCU_ARG
+	if (rcu)
+		return ERR_PTR(-ECHILD);
+#endif
+
 	spin_lock(&lli->lli_lock);
 	/* VFS' acl_permission_check->check_acl will release the refcount */
 	acl = posix_acl_dup(lli->lli_posix_acl);
--- a/lustre/llite/llite_internal.h
+++ b/lustre/llite/llite_internal.h
@@ -883,7 +883,11 @@ int ll_getattr(struct user_namespace *mn
 #else
 int ll_getattr(struct vfsmount *mnt, struct dentry *de, struct kstat *stat);
 #endif /* HAVE_USER_NAMESPACE_ARG */
-struct posix_acl *ll_get_acl(struct inode *inode, int type);
+struct posix_acl *ll_get_acl(struct inode *inode, int type
+#ifdef HAVE_GET_ACL_RCU_ARG
+			     , bool rcu
+#endif /* HAVE_GET_ACL_RCU_ARG */
+			     );
 #ifdef HAVE_IOP_SET_ACL
 #ifdef CONFIG_FS_POSIX_ACL
 int ll_set_acl(struct user_namespace *mnt_userns, struct inode *inode,