commit 6925bd2e1a3154fdb8198111c8f67e2e3e816b73
author Qu Wenruo <wqu@suse.com> Wed Jun 24 18:02:53 2020 +0200
committer Tom Rini <trini@konsulko.com> Mon Sep 07 20:57:27 2020 -0400
tree a5f3ddd61bbb247025d666af0f98f2afe20815d3
parent c43c52980d9cd281b117db28d0e158a2cb875153

fs: btrfs: Crossport structure accessor into ctree.h

This brings all structure accessors from btrfs-progs/ctree.h, as in
kernel's ctree.h.

All these accessors handle the endian convert at runtime, and since all
of them are defined as static inline functions, those which aren't used
won't take space in resulting binary.

Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: Marek Behún <marek.behun@nic.cz>

fs/btrfs/compat.h

diff --git a/fs/btrfs/compat.h b/fs/btrfs/compat.h
index b354c17..12fb9f8 100644
--- a/fs/btrfs/compat.h
+++ b/fs/btrfs/compat.h
@@ -24,6 +24,20 @@
 #define __le8 u8
 
 /*
+ * Macros to generate set/get funcs for the struct fields
+ * assume there is a lefoo_to_cpu for every type, so lets make a simple
+ * one for u8:
+ */
+#define le8_to_cpu(v) (v)
+#define cpu_to_le8(v) (v)
+#define __le8 u8
+
+#define get_unaligned_le8(p) (*((u8 *)(p)))
+#define get_unaligned_8(p) (*((u8 *)(p)))
+#define put_unaligned_le8(val,p) ((*((u8 *)(p))) = (val))
+#define put_unaligned_8(val,p) ((*((u8 *)(p))) = (val))
+
+/*
  * Read data from device specified by @desc and @part
  *
  * U-boot equivalent of pread().