btrfs: switch BTRFS_FS_STATE_* to enums

We can use simple enum for values that are not part of on-disk format:
global filesystem states.

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/ctree.h b/fs/btrfs/ctree.h
index 0ac7efd3d2b2730e4a9c24816ef806964c050e88..84ffd3163aec593c89696401ee62b99f0480b93a 100644 (file)
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -109,13 +109,26 @@ static inline unsigned long btrfs_chunk_item_size(int num_stripes)
 }
 
 /*
- * File system states
+ * Runtime (in-memory) states of filesystem
  */
-#define BTRFS_FS_STATE_ERROR           0
-#define BTRFS_FS_STATE_REMOUNTING      1
-#define BTRFS_FS_STATE_TRANS_ABORTED   2
-#define BTRFS_FS_STATE_DEV_REPLACING   3
-#define BTRFS_FS_STATE_DUMMY_FS_INFO   4
+enum {
+       /* Global indicator of serious filesystem errors */
+       BTRFS_FS_STATE_ERROR,
+       /*
+        * Filesystem is being remounted, allow to skip some operations, like
+        * defrag
+        */
+       BTRFS_FS_STATE_REMOUNTING,
+       /* Track if a transaction abort has been reported on this filesystem */
+       BTRFS_FS_STATE_TRANS_ABORTED,
+       /*
+        * Bio operations should be blocked on this filesystem because a source
+        * or target device is being destroyed as part of a device replace
+        */
+       BTRFS_FS_STATE_DEV_REPLACING,
+       /* The btrfs_fs_info created for self-tests */
+       BTRFS_FS_STATE_DUMMY_FS_INFO,
+};
 
 #define BTRFS_BACKREF_REV_MAX          256
 #define BTRFS_BACKREF_REV_SHIFT                56