mirror_zfs/config/kernel-idmap_mnt_api.m4

dnl #
dnl # 5.12 API
dnl #
dnl # Check if APIs for idmapped mount are available
dnl #
AC_DEFUN([ZFS_AC_KERNEL_SRC_IDMAP_MNT_API], [
        ZFS_LINUX_TEST_SRC([idmap_mnt_api], [
                #include <linux/fs.h>
        ],[
		int fs_flags = 0;
		fs_flags |= FS_ALLOW_IDMAP;
        ])
])

AC_DEFUN([ZFS_AC_KERNEL_IDMAP_MNT_API], [
        AC_MSG_CHECKING([whether APIs for idmapped mount are present])
        ZFS_LINUX_TEST_RESULT([idmap_mnt_api], [
                AC_MSG_RESULT([yes])
                AC_DEFINE(HAVE_IDMAP_MNT_API, 1,
                    [APIs for idmapped mount are present])
        ],[
                AC_MSG_RESULT([no])
        ])
])

dnl #
dnl # 6.8 decouples mnt_idmap from user_namespace. This is all internal
dnl # to mnt_idmap so we can't detect it directly, but we detect a related
dnl # change as use that as a signal.
dnl #
AC_DEFUN([ZFS_AC_KERNEL_SRC_IDMAP_NO_USERNS], [
	ZFS_LINUX_TEST_SRC([idmap_no_userns], [
		#include <linux/uidgid.h>
	], [
		struct uid_gid_map *map = NULL;
		map_id_down(map, 0);
	])
])


AC_DEFUN([ZFS_AC_KERNEL_IDMAP_NO_USERNS], [
	AC_MSG_CHECKING([whether idmapped mounts have a user namespace])
	ZFS_LINUX_TEST_RESULT([idmap_no_userns], [
		AC_MSG_RESULT([yes])
		AC_DEFINE(HAVE_IDMAP_NO_USERNS, 1,
			[mnt_idmap does not have user_namespace])
	], [
		AC_MSG_RESULT([no])
	])
])