mirror_zfs/config/kernel-bdev-logical-size.m4
Brian Behlendorf c9c0d073da Add build system
Add autoconf style build infrastructure to the ZFS tree.  This
includes autogen.sh, configure.ac, m4 macros, some scripts/*,
and makefiles for all the core ZFS components.
2010-08-31 13:41:27 -07:00

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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])
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)
])
])