config/kernel-bdi.m4

   1 dnl #
   2 dnl # Check available BDI interfaces.
   3 dnl #
   4 AC_DEFUN([ZFS_AC_KERNEL_SRC_BDI], [
   5         ZFS_LINUX_TEST_SRC([super_setup_bdi_name], [
   6                 #include <linux/fs.h>
   7                 struct super_block sb;
   8         ], [
   9                 char *name = "bdi";
  10                 atomic_long_t zfs_bdi_seq;
  11                 int error __attribute__((unused));
  12                 atomic_long_set(&zfs_bdi_seq, 0);
  13                 error =
  14                     super_setup_bdi_name(&sb, "%.28s-%ld", name,
  15                     atomic_long_inc_return(&zfs_bdi_seq));
  16         ])
  17
  18         ZFS_LINUX_TEST_SRC([bdi_setup_and_register], [
  19                 #include <linux/backing-dev.h>
  20                 struct backing_dev_info bdi;
  21         ], [
  22                 char *name = "bdi";
  23                 int error __attribute__((unused)) =
  24                     bdi_setup_and_register(&bdi, name);
  25         ])
  26
  27         ZFS_LINUX_TEST_SRC([bdi_setup_and_register_3args], [
  28                 #include <linux/backing-dev.h>
  29                 struct backing_dev_info bdi;
  30         ], [
  31                 char *name = "bdi";
  32                 unsigned int cap = BDI_CAP_MAP_COPY;
  33                 int error __attribute__((unused)) =
  34                     bdi_setup_and_register(&bdi, name, cap);
  35         ])
  36 ])
  37
  38 AC_DEFUN([ZFS_AC_KERNEL_BDI], [
  39         dnl #
  40         dnl # 4.12, super_setup_bdi_name() introduced.
  41         dnl #
  42         AC_MSG_CHECKING([whether super_setup_bdi_name() exists])
  43         ZFS_LINUX_TEST_RESULT_SYMBOL([super_setup_bdi_name],
  44             [super_setup_bdi_name], [fs/super.c], [
  45                 AC_MSG_RESULT(yes)
  46                 AC_DEFINE(HAVE_SUPER_SETUP_BDI_NAME, 1,
  47                     [super_setup_bdi_name() exits])
  48         ], [
  49                 AC_MSG_RESULT(no)
  50
  51                 dnl #
  52                 dnl # 4.0 - 4.11, bdi_setup_and_register() takes 2 arguments.
  53                 dnl #
  54                 AC_MSG_CHECKING(
  55                     [whether bdi_setup_and_register() wants 2 args])
  56                 ZFS_LINUX_TEST_RESULT_SYMBOL([bdi_setup_and_register],
  57                     [bdi_setup_and_register], [mm/backing-dev.c], [
  58                         AC_MSG_RESULT(yes)
  59                         AC_DEFINE(HAVE_2ARGS_BDI_SETUP_AND_REGISTER, 1,
  60                             [bdi_setup_and_register() wants 2 args])
  61                 ], [
  62                         AC_MSG_RESULT(no)
  63
  64                         dnl #
  65                         dnl # 2.6.34 - 3.19, bdi_setup_and_register()
  66                         dnl # takes 3 arguments.
  67                         dnl #
  68                         AC_MSG_CHECKING(
  69                             [whether bdi_setup_and_register() wants 3 args])
  70                         ZFS_LINUX_TEST_RESULT_SYMBOL(
  71                             [bdi_setup_and_register_3args],
  72                             [bdi_setup_and_register], [mm/backing-dev.c], [
  73                                 AC_MSG_RESULT(yes)
  74                                 AC_DEFINE(HAVE_3ARGS_BDI_SETUP_AND_REGISTER, 1,
  75                                     [bdi_setup_and_register() wants 3 args])
  76                         ], [
  77                                 ZFS_LINUX_TEST_ERROR([bdi_setup])
  78                         ])
  79                 ])
  80         ])
  81 ])