btrfs_tree.h: fix include from userland

NicolasDichtel · masahir0y · commit 3a4e7f56ca6c · 2017-05-11T00:18:38.000+09:00
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 &lt;nicolas.dichtel@6wind.com&gt;
Signed-off-by: Masahiro Yamada &lt;yamada.masahiro@socionext.com&gt;
diff --git a/include/uapi/linux/btrfs_tree.h b/include/uapi/linux/btrfs_tree.h
@@ -1,6 +1,7 @@
 #ifndef _BTRFS_CTREE_H_
 #define _BTRFS_CTREE_H_
 
+#include <linux/btrfs.h>
 #include <linux/types.h>
 
 /*
