[mirror_zfs.git] / config / kernel-bdev-logical-size.m4

dnl #
dnl # 2.6.30 API change
dnl # bdev_hardsect_size() replaced with bdev_logical_block_size().  While
dnl # it has been true for a while that there was no strict 1:1 mapping
dnl # between physical sector size and logical block size this change makes
dnl # it explicit.
dnl #
AC_DEFUN([ZFS_AC_KERNEL_BDEV_LOGICAL_BLOCK_SIZE], [
	AC_MSG_CHECKING([whether bdev_logical_block_size() is available])
	tmp_flags="$EXTRA_KCFLAGS"
	EXTRA_KCFLAGS="${NO_UNUSED_BUT_SET_VARIABLE}"
	ZFS_LINUX_TRY_COMPILE([
		#include <linux/blkdev.h>
	],[
		struct block_device *bdev = NULL;
		bdev_logical_block_size(bdev);
	],[
		AC_MSG_RESULT(yes)
		AC_DEFINE(HAVE_BDEV_LOGICAL_BLOCK_SIZE, 1,
		          [bdev_logical_block_size() is available])
	],[
		AC_MSG_RESULT(no)
	])
	EXTRA_KCFLAGS="$tmp_flags"
])
Commit	Line	Data
c9c0d073 BB	1	dnl #
	2	dnl # 2.6.30 API change
	3	dnl # bdev_hardsect_size() replaced with bdev_logical_block_size(). While
	4	dnl # it has been true for a while that there was no strict 1:1 mapping
	5	dnl # between physical sector size and logical block size this change makes
	6	dnl # it explicit.
	7	dnl #
	8	AC_DEFUN([ZFS_AC_KERNEL_BDEV_LOGICAL_BLOCK_SIZE], [
	9	AC_MSG_CHECKING([whether bdev_logical_block_size() is available])
b9c59ec8	10	tmp_flags="$EXTRA_KCFLAGS"
e191b54e	11	EXTRA_KCFLAGS="${NO_UNUSED_BUT_SET_VARIABLE}"
c9c0d073 BB	12	ZFS_LINUX_TRY_COMPILE([
	13	#include <linux/blkdev.h>
	14	],[
	15	struct block_device *bdev = NULL;
	16	bdev_logical_block_size(bdev);
	17	],[
	18	AC_MSG_RESULT(yes)
	19	AC_DEFINE(HAVE_BDEV_LOGICAL_BLOCK_SIZE, 1,
	20	[bdev_logical_block_size() is available])
	21	],[
	22	AC_MSG_RESULT(no)
	23	])
b9c59ec8	24	EXTRA_KCFLAGS="$tmp_flags"
c9c0d073	25	])