diff --git a/config/kernel-bdev-logical-size.m4 b/config/kernel-bdev-logical-size.m4
new file mode 100644
index 0000000000..1e199663b1
--- /dev/null
+++ b/config/kernel-bdev-logical-size.m4
@@ -0,0 +1,22 @@
+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)
+	])
+])
diff --git a/config/kernel.m4 b/config/kernel.m4
index 521e69f27b..de0c8575a4 100644
--- a/config/kernel.m4
+++ b/config/kernel.m4
@@ -6,6 +6,7 @@ AC_DEFUN([ZFS_AC_CONFIG_KERNEL], [
 	ZFS_AC_SPL
 	ZFS_AC_KERNEL_OPEN_BDEV_EXCLUSIVE
 	ZFS_AC_KERNEL_INVALIDATE_BDEV_ARGS
+	ZFS_AC_KERNEL_BDEV_LOGICAL_BLOCK_SIZE
 	ZFS_AC_KERNEL_BIO_END_IO_T_ARGS
 	ZFS_AC_KERNEL_BIO_RW_SYNCIO
 	ZFS_AC_KERNEL_BIO_EMPTY_BARRIER