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dnl #
dnl # 2.6.32 - 2.6.33, bdi_setup_and_register() is not exported.
dnl # 2.6.34 - 3.19, bdi_setup_and_register() takes 3 arguments.
dnl # 4.0 - 4.11, bdi_setup_and_register() takes 2 arguments.
dnl # 4.12 - x.y, super_setup_bdi_name() new interface.
dnl #
AC_DEFUN([ZFS_AC_KERNEL_BDI], [
AC_MSG_CHECKING([whether super_setup_bdi_name() exists])
ZFS_LINUX_TRY_COMPILE_SYMBOL([
#include <linux/fs.h>
struct super_block sb;
], [
char *name = "bdi";
atomic_long_t zfs_bdi_seq;
int error __attribute__((unused)) =
super_setup_bdi_name(&sb, "%.28s-%ld", name, atomic_long_inc_return(&zfs_bdi_seq));
], [super_setup_bdi_name], [fs/super.c], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_SUPER_SETUP_BDI_NAME, 1,
[super_setup_bdi_name() exits])
], [
AC_MSG_RESULT(no)
AC_MSG_CHECKING(
[whether bdi_setup_and_register() wants 2 args])
ZFS_LINUX_TRY_COMPILE_SYMBOL([
#include <linux/backing-dev.h>
struct backing_dev_info bdi;
], [
char *name = "bdi";
int error __attribute__((unused)) =
bdi_setup_and_register(&bdi, name);
], [bdi_setup_and_register], [mm/backing-dev.c], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_2ARGS_BDI_SETUP_AND_REGISTER, 1,
[bdi_setup_and_register() wants 2 args])
], [
AC_MSG_RESULT(no)
AC_MSG_CHECKING(
[whether bdi_setup_and_register() wants 3 args])
ZFS_LINUX_TRY_COMPILE_SYMBOL([
#include <linux/backing-dev.h>
struct backing_dev_info bdi;
], [
char *name = "bdi";
unsigned int cap = BDI_CAP_MAP_COPY;
int error __attribute__((unused)) =
bdi_setup_and_register(&bdi, name, cap);
], [bdi_setup_and_register], [mm/backing-dev.c], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_3ARGS_BDI_SETUP_AND_REGISTER, 1,
[bdi_setup_and_register() wants 3 args])
], [
AC_MSG_RESULT(no)
])
])
])
])
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