dnl #
dnl # 2.6.38 API change,
dnl # Added blkdev_get_by_path()
dnl #
AC_DEFUN([ZFS_AC_KERNEL_SRC_BLKDEV_GET_BY_PATH], [
	ZFS_LINUX_TEST_SRC([blkdev_get_by_path], [
		#include <linux/fs.h>
	], [
		struct block_device *bdev __attribute__ ((unused)) = NULL;
		const char *path = "path";
		fmode_t mode = 0;
		void *holder = NULL;

		bdev = blkdev_get_by_path(path, mode, holder);
	])
])

AC_DEFUN([ZFS_AC_KERNEL_BLKDEV_GET_BY_PATH], [
	AC_MSG_CHECKING([whether blkdev_get_by_path() exists])
	ZFS_LINUX_TEST_RESULT([blkdev_get_by_path], [
		AC_MSG_RESULT(yes)
	], [
		ZFS_LINUX_TEST_ERROR([blkdev_get_by_path()])
	])
])

dnl #
dnl # 2.6.38 API change,
dnl # Added blkdev_put()
dnl #
AC_DEFUN([ZFS_AC_KERNEL_SRC_BLKDEV_PUT], [
	ZFS_LINUX_TEST_SRC([blkdev_put], [
		#include <linux/fs.h>
	], [
		struct block_device *bdev = NULL;
		fmode_t mode = 0;

		blkdev_put(bdev, mode);
	])
])

AC_DEFUN([ZFS_AC_KERNEL_BLKDEV_PUT], [
	AC_MSG_CHECKING([whether blkdev_put() exists])
	ZFS_LINUX_TEST_RESULT([blkdev_put], [
		AC_MSG_RESULT(yes)
	], [
		ZFS_LINUX_TEST_ERROR([blkdev_put()])
	])
])

dnl #
dnl # 4.1 API, exported blkdev_reread_part() symbol, back ported to the
dnl # 3.10.0 CentOS 7.x enterprise kernels.
dnl #
AC_DEFUN([ZFS_AC_KERNEL_SRC_BLKDEV_REREAD_PART], [
	ZFS_LINUX_TEST_SRC([blkdev_reread_part], [
		#include <linux/fs.h>
	], [
		struct block_device *bdev = NULL;
		int error;

		error = blkdev_reread_part(bdev);
	])
])

AC_DEFUN([ZFS_AC_KERNEL_BLKDEV_REREAD_PART], [
	AC_MSG_CHECKING([whether blkdev_reread_part() exists])
	ZFS_LINUX_TEST_RESULT([blkdev_reread_part], [
		AC_MSG_RESULT(yes)
		AC_DEFINE(HAVE_BLKDEV_REREAD_PART, 1,
		    [blkdev_reread_part() exists])
	], [
		AC_MSG_RESULT(no)
	])
])

dnl #
dnl # 2.6.22 API change
dnl # Single argument invalidate_bdev()
dnl #
AC_DEFUN([ZFS_AC_KERNEL_SRC_BLKDEV_INVALIDATE_BDEV], [
	ZFS_LINUX_TEST_SRC([invalidate_bdev], [
		#include <linux/buffer_head.h>
	],[
		struct block_device *bdev = NULL;
		invalidate_bdev(bdev);
	])
])

AC_DEFUN([ZFS_AC_KERNEL_BLKDEV_INVALIDATE_BDEV], [
	AC_MSG_CHECKING([whether invalidate_bdev() exists])
	ZFS_LINUX_TEST_RESULT([invalidate_bdev], [
		AC_MSG_RESULT(yes)
	],[
		ZFS_LINUX_TEST_ERROR([invalidate_bdev()])
	])
])

dnl #
dnl # 2.6.27, lookup_bdev() was exported.
dnl # 4.4.0-6.21 - lookup_bdev() takes 2 arguments.
dnl #
AC_DEFUN([ZFS_AC_KERNEL_SRC_BLKDEV_LOOKUP_BDEV], [
	ZFS_LINUX_TEST_SRC([lookup_bdev_1arg], [
		#include <linux/fs.h>
	], [
		lookup_bdev(NULL);
	])

	ZFS_LINUX_TEST_SRC([lookup_bdev_2args], [
		#include <linux/fs.h>
	], [
		lookup_bdev(NULL, FMODE_READ);
	])
])

AC_DEFUN([ZFS_AC_KERNEL_BLKDEV_LOOKUP_BDEV], [
	AC_MSG_CHECKING([whether lookup_bdev() wants 1 arg])
	ZFS_LINUX_TEST_RESULT_SYMBOL([lookup_bdev_1arg],
	    [lookup_bdev], [fs/block_dev.c], [
		AC_MSG_RESULT(yes)
		AC_DEFINE(HAVE_1ARG_LOOKUP_BDEV, 1,
		    [lookup_bdev() wants 1 arg])
	], [
		AC_MSG_RESULT(no)

		AC_MSG_CHECKING([whether lookup_bdev() wants 2 args])
		ZFS_LINUX_TEST_RESULT_SYMBOL([lookup_bdev_2args],
		    [lookup_bdev], [fs/block_dev.c], [
			AC_MSG_RESULT(yes)
			AC_DEFINE(HAVE_2ARGS_LOOKUP_BDEV, 1,
			    [lookup_bdev() wants 2 args])
		], [
			ZFS_LINUX_TEST_ERROR([lookup_bdev()])
		])
	])
])

dnl #
dnl # 2.6.30 API change
dnl #
dnl # The bdev_physical_block_size() interface was added to provide a way
dnl # to determine the smallest write which can be performed without a
dnl # read-modify-write operation.
dnl #
dnl # Unfortunately, this interface isn't entirely reliable because
dnl # drives are sometimes known to misreport this value.
dnl #
AC_DEFUN([ZFS_AC_KERNEL_SRC_BLKDEV_BDEV_PHYSICAL_BLOCK_SIZE], [
	ZFS_LINUX_TEST_SRC([bdev_physical_block_size], [
		#include <linux/blkdev.h>
	],[
		struct block_device *bdev __attribute__ ((unused)) = NULL;
		bdev_physical_block_size(bdev);
	])
])

AC_DEFUN([ZFS_AC_KERNEL_BLKDEV_BDEV_PHYSICAL_BLOCK_SIZE], [
	AC_MSG_CHECKING([whether bdev_physical_block_size() is available])
	ZFS_LINUX_TEST_RESULT([bdev_physical_block_size], [
		AC_MSG_RESULT(yes)
	],[
		ZFS_LINUX_TEST_ERROR([bdev_physical_block_size()])
	])
])

dnl #
dnl # 2.6.30 API change
dnl # Added bdev_logical_block_size().
dnl #
AC_DEFUN([ZFS_AC_KERNEL_SRC_BLKDEV_BDEV_LOGICAL_BLOCK_SIZE], [
	ZFS_LINUX_TEST_SRC([bdev_logical_block_size], [
		#include <linux/blkdev.h>
	],[
		struct block_device *bdev __attribute__ ((unused)) = NULL;
		bdev_logical_block_size(bdev);
	])
])

AC_DEFUN([ZFS_AC_KERNEL_BLKDEV_BDEV_LOGICAL_BLOCK_SIZE], [
	AC_MSG_CHECKING([whether bdev_logical_block_size() is available])
	ZFS_LINUX_TEST_RESULT([bdev_logical_block_size], [
		AC_MSG_RESULT(yes)
	],[
		ZFS_LINUX_TEST_ERROR([bdev_logical_block_size()])
	])
])

AC_DEFUN([ZFS_AC_KERNEL_SRC_BLKDEV], [
	ZFS_AC_KERNEL_SRC_BLKDEV_GET_BY_PATH
	ZFS_AC_KERNEL_SRC_BLKDEV_PUT
	ZFS_AC_KERNEL_SRC_BLKDEV_REREAD_PART
	ZFS_AC_KERNEL_SRC_BLKDEV_INVALIDATE_BDEV
	ZFS_AC_KERNEL_SRC_BLKDEV_LOOKUP_BDEV
	ZFS_AC_KERNEL_SRC_BLKDEV_BDEV_LOGICAL_BLOCK_SIZE
	ZFS_AC_KERNEL_SRC_BLKDEV_BDEV_PHYSICAL_BLOCK_SIZE
])

AC_DEFUN([ZFS_AC_KERNEL_BLKDEV], [
	ZFS_AC_KERNEL_BLKDEV_GET_BY_PATH
	ZFS_AC_KERNEL_BLKDEV_PUT
	ZFS_AC_KERNEL_BLKDEV_REREAD_PART
	ZFS_AC_KERNEL_BLKDEV_INVALIDATE_BDEV
	ZFS_AC_KERNEL_BLKDEV_LOOKUP_BDEV
	ZFS_AC_KERNEL_BLKDEV_BDEV_LOGICAL_BLOCK_SIZE
	ZFS_AC_KERNEL_BLKDEV_BDEV_PHYSICAL_BLOCK_SIZE
])