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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])
tmp_flags="$EXTRA_KCFLAGS"
EXTRA_KCFLAGS="-Wno-unused-but-set-variable"
ZFS_LINUX_TRY_COMPILE([
#include <linux/blkdev.h>
],[
struct block_device *bdev = NULL;
bdev_logical_block_size(bdev);
],[
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_BDEV_LOGICAL_BLOCK_SIZE, 1,
[bdev_logical_block_size() is available])
],[
AC_MSG_RESULT(no)
])
EXTRA_KCFLAGS="$tmp_flags"
])
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