btrfs: switch EXTENT_BUFFER_* to enums

We can use simple enum for values that are not part of on-disk format:
extent buffer flags;

Reviewed-by: Omar Sandoval <osandov@fb.com>
Reviewed-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h
index a1d3ea5a0d329154655ca64e7d08e1c2b058f272..fd42492e62e5b3e3aeb807e5b0d2084ac3aef13f 100644 (file)
--- a/fs/btrfs/extent_io.h
+++ b/fs/btrfs/extent_io.h
@@ -37,18 +37,22 @@
 #define EXTENT_BIO_COMPRESSED 1
 #define EXTENT_BIO_FLAG_SHIFT 16
 
-/* these are bit numbers for test/set bit */
-#define EXTENT_BUFFER_UPTODATE 0
-#define EXTENT_BUFFER_DIRTY 2
-#define EXTENT_BUFFER_CORRUPT 3
-#define EXTENT_BUFFER_READAHEAD 4      /* this got triggered by readahead */
-#define EXTENT_BUFFER_TREE_REF 5
-#define EXTENT_BUFFER_STALE 6
-#define EXTENT_BUFFER_WRITEBACK 7
-#define EXTENT_BUFFER_READ_ERR 8        /* read IO error */
-#define EXTENT_BUFFER_UNMAPPED 9
-#define EXTENT_BUFFER_IN_TREE 10
-#define EXTENT_BUFFER_WRITE_ERR 11    /* write IO error */
+enum {
+       EXTENT_BUFFER_UPTODATE,
+       EXTENT_BUFFER_DIRTY,
+       EXTENT_BUFFER_CORRUPT,
+       /* this got triggered by readahead */
+       EXTENT_BUFFER_READAHEAD,
+       EXTENT_BUFFER_TREE_REF,
+       EXTENT_BUFFER_STALE,
+       EXTENT_BUFFER_WRITEBACK,
+       /* read IO error */
+       EXTENT_BUFFER_READ_ERR,
+       EXTENT_BUFFER_UNMAPPED,
+       EXTENT_BUFFER_IN_TREE,
+       /* write IO error */
+       EXTENT_BUFFER_WRITE_ERR,
+};
 
 /* these are flags for __process_pages_contig */
 #define PAGE_UNLOCK            (1 << 0)