[PATCH 1/9] btrfs: switch BTRFS_FS_STATE_* to enums

[David Sterba <dsterba@suse.com>]

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

Signed-off-by: David Sterba <dsterba@suse.com>
---
 fs/btrfs/ctree.h | 25 +++++++++++++++++++------
 1 file changed, 19 insertions(+), 6 deletions(-)

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index a98507fa9192..f82ec5e41b0c 100644
--- 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 filesysystem errors */
+	BTRFS_FS_STATE_ERROR,
+	/*
+	 * Filesystem is being remounted, allow to skip some operations, like
+	 * defrag
+	 */
+	BTRFS_FS_STATE_REMOUNTING,
+	/* Track if the transaction abort has been reported */
+	BTRFS_FS_STATE_TRANS_ABORTED,
+	/*
+	 * Indicate that replace source or target device state is changed and
+	 * allow to block bio operations
+	 */
+	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
-- 
2.19.1