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Update tmpfile() existence detection #12087

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Merged
merged 1 commit into from
May 20, 2021
Merged

Update tmpfile() existence detection #12087

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28 changes: 24 additions & 4 deletions config/kernel-tmpfile.m4
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Original file line number Diff line number Diff line change
Expand Up @@ -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)
])
])
])
5 changes: 5 additions & 0 deletions module/os/linux/zfs/zpl_inode.c
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Expand Up @@ -224,7 +224,12 @@ 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;
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