Btrfs-progs: Fix compiler warnings on PPC64

The kernel uses unsigned long long for u64, but PPC64 uses unsigned
long by default. This results in compilation warnings such as:

print-tree.c:333: warning: format '%llu' expects type 'long long
unsigned int', but argument 4 has type 'u64'

To fix this, the macro __KERNEL__ needs to be defined before including
the file <asm/types.h>. This can be done by defining the macro in
"kerncompat.h" and making it the first included file in the relevant
header files; this fixes the compiler warnings on PPC64.

Reviewed-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Wade Cline <clinew@linux.vnet.ibm.com>

cmds-receive.c

@@ -21,6 +21,8 @@
 #define _XOPEN_SOURCE 700
 #define _BSD_SOURCE
 
+#include "kerncompat.h"
+
 #include <unistd.h>
 #include <stdint.h>
 #include <dirent.h>

cmds-scrub.c

@@ -16,6 +16,8 @@
  * Boston, MA 021110-1307, USA.
  */
 
+#include "kerncompat.h"
+
 #include <sys/ioctl.h>
 #include <sys/wait.h>
 #include <sys/stat.h>

cmds-send.c

@@ -18,6 +18,8 @@
 
 #define _GNU_SOURCE
 
+#include "kerncompat.h"
+
 #include <unistd.h>
 #include <stdint.h>
 #include <dirent.h>

convert.c

@@ -18,6 +18,9 @@
 
 #define _XOPEN_SOURCE 600
 #define _GNU_SOURCE 1
+
+#include "kerncompat.h"
+
 #ifndef __CHECKER__
 #include <sys/ioctl.h>
 #include <sys/mount.h>
@@ -31,7 +34,7 @@
 #include <unistd.h>
 #include <uuid/uuid.h>
 #include <linux/fs.h>
-#include "kerncompat.h"
+
 #include "ctree.h"
 #include "disk-io.h"
 #include "volumes.h"

kerncompat.h

@@ -18,6 +18,7 @@
 
 #ifndef __KERNCOMPAT
 #define __KERNCOMPAT
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <errno.h>
@@ -57,11 +58,22 @@
 #endif
 
 #ifndef __CHECKER__
+/*
+ * Since we're using primitive definitions from kernel-space, we need to
+ * define __KERNEL__ so that system header files know which definitions
+ * to use.
+ */
+#define __KERNEL__
 #include <asm/types.h>
 typedef __u32 u32;
 typedef __u64 u64;
 typedef __u16 u16;
 typedef __u8 u8;
+/*
+ * Continuing to define __KERNEL__ breaks others parts of the code, so
+ * we can just undefine it now that we have the correct headers...
+ */
+#undef __KERNEL__
 #else
 typedef unsigned int u32;
 typedef unsigned int __u32;

mkfs.c

@@ -19,6 +19,8 @@
 #define _XOPEN_SOURCE 500
 #define _GNU_SOURCE
 
+#include "kerncompat.h"
+
 #ifndef __CHECKER__
 #include <sys/ioctl.h>
 #include <sys/mount.h>
@@ -37,7 +39,6 @@
 #include <linux/fs.h>
 #include <ctype.h>
 #include <attr/xattr.h>
-#include "kerncompat.h"
 #include "ctree.h"
 #include "disk-io.h"
 #include "volumes.h"

restore.c

@@ -18,6 +18,9 @@
 
 #define _XOPEN_SOURCE 500
 #define _GNU_SOURCE 1
+
+#include "kerncompat.h"
+
 #include <ctype.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -25,7 +28,7 @@
 #include <fcntl.h>
 #include <sys/stat.h>
 #include <zlib.h>
-#include "kerncompat.h"
+
 #include "ctree.h"
 #include "disk-io.h"
 #include "print-tree.h"