New upstream version 0.7.2

[mirror_zfs-debian.git] / config / kernel-blk-queue-bdi.m4

diff --git a/config/kernel-blk-queue-bdi.m4 b/config/kernel-blk-queue-bdi.m4
new file mode 100644 (file)
index 0000000..8164711
--- /dev/null
+++ b/config/kernel-blk-queue-bdi.m4
@@ -0,0 +1,20 @@
+dnl #
+dnl # 2.6.32 - 4.11, statically allocated bdi in request_queue
+dnl # 4.12 - x.y, dynamically allocated bdi in request_queue
+dnl #
+AC_DEFUN([ZFS_AC_KERNEL_BLK_QUEUE_BDI], [
+       AC_MSG_CHECKING([whether blk_queue bdi is dynamic])
+       ZFS_LINUX_TRY_COMPILE([
+               #include <linux/blkdev.h>
+       ],[
+               struct request_queue q;
+               struct backing_dev_info bdi;
+               q.backing_dev_info = &bdi;
+       ],[
+               AC_MSG_RESULT(yes)
+               AC_DEFINE(HAVE_BLK_QUEUE_BDI_DYNAMIC, 1,
+                   [blk queue backing_dev_info is dynamic])
+       ],[
+               AC_MSG_RESULT(no)
+       ])
+])