Btrfs: rewrite BTRFS_SETGET_FUNCS

BTRFS_SETGET_FUNCS macro is used to generate btrfs_set_foo() and
btrfs_foo() functions, which read and write specific fields in the
extent buffer.

The total number of set/get functions is ~200, but in fact we only
need 8 functions: 2 for u8 field, 2 for u16, 2 for u32 and 2 for u64.

It results in redunction of ~37K bytes.

   text    data     bss     dec     hex filename
 629661   12489     216  642366   9cd3e fs/btrfs/btrfs.o.orig
 592637   12489     216  605342   93c9e fs/btrfs/btrfs.o

Signed-off-by: Li Zefan <lizefan@huawei.com>

1 files changed, 47 insertions, 6 deletions

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 6761490b91cd..a0ee2f8e0566 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -1623,13 +1623,54 @@ static inline void btrfs_init_map_token (struct btrfs_map_token *token)
                             offsetof(type, member),                     \
                            sizeof(((type *)0)->member)))
 
-#ifndef BTRFS_SETGET_FUNCS
+#define DECLARE_BTRFS_SETGET_BITS(bits)                                 \
+u##bits btrfs_get_token_##bits(struct extent_buffer *eb, void *ptr,     \
+                               unsigned long off,                       \
+                              struct btrfs_map_token *token);           \
+void btrfs_set_token_##bits(struct extent_buffer *eb, void *ptr,        \
+                            unsigned long off, u##bits val,             \
+                            struct btrfs_map_token *token);             \
+static inline u##bits btrfs_get_##bits(struct extent_buffer *eb, void *ptr, \
+                                       unsigned long off)               \
+{                                                                       \
+        return btrfs_get_token_##bits(eb, ptr, off, NULL);              \
+}                                                                       \
+static inline void btrfs_set_##bits(struct extent_buffer *eb, void *ptr, \
+                                    unsigned long off, u##bits val)     \
+{                                                                       \
+       btrfs_set_token_##bits(eb, ptr, off, val, NULL);                 \
+}
+
+DECLARE_BTRFS_SETGET_BITS(8)
+DECLARE_BTRFS_SETGET_BITS(16)
+DECLARE_BTRFS_SETGET_BITS(32)
+DECLARE_BTRFS_SETGET_BITS(64)
+
 #define BTRFS_SETGET_FUNCS(name, type, member, bits)                    \
-u##bits btrfs_##name(struct extent_buffer *eb, type *s);                \
-u##bits btrfs_token_##name(struct extent_buffer *eb, type *s, struct btrfs_map_token *token);           \
-void btrfs_set_token_##name(struct extent_buffer *eb, type *s, u##bits val, struct btrfs_map_token *token);\
-void btrfs_set_##name(struct extent_buffer *eb, type *s, u##bits val);
-#endif
+static inline u##bits btrfs_##name(struct extent_buffer *eb, type *s)   \
+{                                                                       \
+        BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);   \
+        return btrfs_get_##bits(eb, s, offsetof(type, member));         \
+}                                                                       \
+static inline void btrfs_set_##name(struct extent_buffer *eb, type *s,  \
+                                    u##bits val)                        \
+{                                                                       \
+        BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);   \
+        btrfs_set_##bits(eb, s, offsetof(type, member), val);           \
+}                                                                       \
+static inline u##bits btrfs_token_##name(struct extent_buffer *eb, type *s, \
+                                         struct btrfs_map_token *token) \
+{                                                                       \
+        BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);   \
+        return btrfs_get_token_##bits(eb, s, offsetof(type, member), token); \
+}                                                                       \
+static inline void btrfs_set_token_##name(struct extent_buffer *eb,     \
+                                          type *s, u##bits val,         \
+                                         struct btrfs_map_token *token) \
+{                                                                       \
+        BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);   \
+        btrfs_set_token_##bits(eb, s, offsetof(type, member), val, token); \
+}
 
 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits)             \
 static inline u##bits btrfs_##name(struct extent_buffer *eb)            \