1dnl #
2dnl # Check available BDI interfaces.
3dnl #
4AC_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
38AC_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])
82