config/kernel-blk-queue-physical-block-size.m4

   1 dnl #
   2 dnl # 2.6.30 API change
   3 dnl # The blk_queue_physical_block_size() function was introduced to
   4 dnl # indicate the smallest I/O the device can write without incurring
   5 dnl # a read-modify-write penalty.
   6 dnl #
   7 AC_DEFUN([ZFS_AC_KERNEL_BLK_QUEUE_PHYSICAL_BLOCK_SIZE], [
   8         AC_MSG_CHECKING([whether blk_queue_physical_block_size() is available])
   9         tmp_flags="$EXTRA_KCFLAGS"
  10         EXTRA_KCFLAGS="${NO_UNUSED_BUT_SET_VARIABLE}"
  11         ZFS_LINUX_TRY_COMPILE([
  12                 #include <linux/blkdev.h>
  13         ],[
  14                 struct request_queue *q = NULL;
  15                 unsigned short block_size = 1;
  16                 (void) blk_queue_physical_block_size(q, block_size);
  17         ],[
  18                 AC_MSG_RESULT(yes)
  19                 AC_DEFINE(HAVE_BLK_QUEUE_PHYSICAL_BLOCK_SIZE, 1,
  20                           [blk_queue_physical_block_size() is available])
  21         ],[
  22                 AC_MSG_RESULT(no)
  23         ])
  24         EXTRA_KCFLAGS="$tmp_flags"
  25 ])