From 6eced028dbbc2a44e32c4c0a76234ac2da9a365a Mon Sep 17 00:00:00 2001
From: Rich Ercolani <214141+rincebrain@users.noreply.github.com>
Date: Thu, 20 May 2021 19:02:36 -0400
Subject: [PATCH] Update tmpfile() existence detection

Linux changed the tmpfile() signature again in torvalds/linux@6521f89,
which in turn broke our HAVE_TMPFILE detection in configure.

Update that macro to include the new case, and change the signature of
zpl_tmpfile as appropriate.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Rich Ercolani <rincebrain@gmail.com>
Closes: #12060
Closes: #12087
---
 config/kernel-tmpfile.m4        | 28 ++++++++++++++++++++++++----
 module/os/linux/zfs/zpl_inode.c |  5 +++++
 2 files changed, 29 insertions(+), 4 deletions(-)

diff --git a/config/kernel-tmpfile.m4 b/config/kernel-tmpfile.m4
index f510bfe6ba0..45c2e6ceea5 100644
--- a/config/kernel-tmpfile.m4
+++ b/config/kernel-tmpfile.m4
@@ -3,23 +3,43 @@ dnl # 3.11 API change
 dnl # Add support for i_op->tmpfile
 dnl #
 AC_DEFUN([ZFS_AC_KERNEL_SRC_TMPFILE], [
-	ZFS_LINUX_TEST_SRC([inode_operations_tmpfile], [
+	dnl #
+	dnl # 5.11 API change
+	dnl # add support for userns parameter to tmpfile
+	dnl #
+	ZFS_LINUX_TEST_SRC([inode_operations_tmpfile_userns], [
 		#include <linux/fs.h>
-		int tmpfile(struct inode *inode, struct dentry *dentry,
+		int tmpfile(struct user_namespace *userns,
+		    struct inode *inode, struct dentry *dentry,
 		    umode_t mode) { return 0; }
 		static struct inode_operations
 		    iops __attribute__ ((unused)) = {
 			.tmpfile = tmpfile,
 		};
 	],[])
+	ZFS_LINUX_TEST_SRC([inode_operations_tmpfile], [
+			#include <linux/fs.h>
+			int tmpfile(struct inode *inode, struct dentry *dentry,
+			    umode_t mode) { return 0; }
+			static struct inode_operations
+			    iops __attribute__ ((unused)) = {
+				.tmpfile = tmpfile,
+			};
+	],[])
 ])
 
 AC_DEFUN([ZFS_AC_KERNEL_TMPFILE], [
 	AC_MSG_CHECKING([whether i_op->tmpfile() exists])
-	ZFS_LINUX_TEST_RESULT([inode_operations_tmpfile], [
+	ZFS_LINUX_TEST_RESULT([inode_operations_tmpfile_userns], [
 		AC_MSG_RESULT(yes)
 		AC_DEFINE(HAVE_TMPFILE, 1, [i_op->tmpfile() exists])
+		AC_DEFINE(HAVE_TMPFILE_USERNS, 1, [i_op->tmpfile() has userns])
 	],[
-		AC_MSG_RESULT(no)
+		ZFS_LINUX_TEST_RESULT([inode_operations_tmpfile], [
+			AC_MSG_RESULT(yes)
+			AC_DEFINE(HAVE_TMPFILE, 1, [i_op->tmpfile() exists])
+		],[
+			AC_MSG_RESULT(no)
+		])
 	])
 ])
diff --git a/module/os/linux/zfs/zpl_inode.c b/module/os/linux/zfs/zpl_inode.c
index 364b9fbef24..ab0373ef9ba 100644
--- a/module/os/linux/zfs/zpl_inode.c
+++ b/module/os/linux/zfs/zpl_inode.c
@@ -218,7 +218,12 @@ zpl_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
 
 #ifdef HAVE_TMPFILE
 static int
+#ifdef HAVE_TMPFILE_USERNS
+zpl_tmpfile(struct user_namespace *userns, struct inode *dir,
+    struct dentry *dentry, umode_t mode)
+#else
 zpl_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
+#endif
 {
 	cred_t *cr = CRED();
 	struct inode *ip;