bcachefs: BCH_EXTENT_ENTRY_TYPES()

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

fs/bcachefs/bcachefs_format.h

@@ -461,15 +461,19 @@ enum bch_compression_type {
 	BCH_COMPRESSION_NR		= 5,
 };
 
+#define BCH_EXTENT_ENTRY_TYPES()		\
+	x(ptr,			0)		\
+	x(crc32,		1)		\
+	x(crc64,		2)		\
+	x(crc128,		3)
+#define BCH_EXTENT_ENTRY_MAX	4
+
 enum bch_extent_entry_type {
-	BCH_EXTENT_ENTRY_ptr		= 0,
-	BCH_EXTENT_ENTRY_crc32		= 1,
-	BCH_EXTENT_ENTRY_crc64		= 2,
-	BCH_EXTENT_ENTRY_crc128		= 3,
+#define x(f, n) BCH_EXTENT_ENTRY_##f = n,
+	BCH_EXTENT_ENTRY_TYPES()
+#undef x
 };
 
-#define BCH_EXTENT_ENTRY_MAX		4
-
 /* Compressed/uncompressed size are stored biased by 1: */
 struct bch_extent_crc32 {
 #if defined(__LITTLE_ENDIAN_BITFIELD)
@@ -594,10 +598,10 @@ union bch_extent_entry {
 #else
 #error edit for your odd byteorder.
 #endif
-	struct bch_extent_crc32		crc32;
-	struct bch_extent_crc64		crc64;
-	struct bch_extent_crc128	crc128;
-	struct bch_extent_ptr		ptr;
+
+#define x(f, n) struct bch_extent_##f	f;
+	BCH_EXTENT_ENTRY_TYPES()
+#undef x
 };
 
 enum {

fs/bcachefs/extents.h

@@ -162,14 +162,11 @@ extent_entry_type(const union bch_extent_entry *e)
 static inline size_t extent_entry_bytes(const union bch_extent_entry *entry)
 {
 	switch (extent_entry_type(entry)) {
-	case BCH_EXTENT_ENTRY_crc32:
-		return sizeof(struct bch_extent_crc32);
-	case BCH_EXTENT_ENTRY_crc64:
-		return sizeof(struct bch_extent_crc64);
-	case BCH_EXTENT_ENTRY_crc128:
-		return sizeof(struct bch_extent_crc128);
-	case BCH_EXTENT_ENTRY_ptr:
-		return sizeof(struct bch_extent_ptr);
+#define x(f, n)						\
+	case BCH_EXTENT_ENTRY_##f:			\
+		return sizeof(struct bch_extent_##f);
+	BCH_EXTENT_ENTRY_TYPES()
+#undef x
 	default:
 		BUG();
 	}