This was reported when docker failed to build against
btrfs-progs v4.8.1.

It includes ioctl.h which now calls BUILD_ASSERT(), which
is defined in kerncompat.h, which was not included in the
ioctl.h header file.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
---

diff --git a/ioctl.h b/ioctl.h
index a7235c0..abea7ed 100644
--- a/ioctl.h
+++ b/ioctl.h
@@ -26,6 +26,12 @@ extern "C" {
 #include <asm/types.h>
 #include <linux/ioctl.h>
 
+#if BTRFS_FLAT_INCLUDES
+#include "kerncompat.h"
+#else
+#include <btrfs/kerncompat.h>
+#endif /* BTRFS_FLAT_INCLUDES */
+
 #ifndef __user
 #define __user
 #endif

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