[PATCH v9 07/11] btrfs_tree.h: fix include from userland

[Nicolas Dichtel <nicolas.dichtel@xxxxxxxxx>]

This patch prepares the uapi export by fixing the following errors:

.../linux/btrfs_tree.h:283:2: error: #error "UUID items require BTRFS_UUID_SIZE == 16!"
 #error "UUID items require BTRFS_UUID_SIZE == 16!"

.../linux/btrfs_tree.h:390:12: error: ‘BTRFS_UUID_SIZE’ undeclared here (not in a function)
  __u8 uuid[BTRFS_UUID_SIZE];
            ^
.../linux/btrfs_tree.h:796:16: error: ‘BTRFS_DEV_STAT_VALUES_MAX’ undeclared here (not in a function)
  __le64 values[BTRFS_DEV_STAT_VALUES_MAX];

Signed-off-by: Nicolas Dichtel <nicolas.dichtel@xxxxxxxxx>
---
 include/uapi/linux/btrfs_tree.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/uapi/linux/btrfs_tree.h b/include/uapi/linux/btrfs_tree.h
index 6a261cb52d95..6a754ada59af 100644
--- a/include/uapi/linux/btrfs_tree.h
+++ b/include/uapi/linux/btrfs_tree.h
@@ -2,6 +2,7 @@
 #define _BTRFS_CTREE_H_
 
 #include <linux/types.h>
+#include <linux/btrfs.h>
 
 /*
  * This header contains the structure definitions and constants used
-- 
2.8.1