btrfs-progs: Use symbolic names for read ahead behavior

Presently btrfs-progs haven't pulled the enum defining the symbolic
names of read ahead constants. This commit adds the enum and
simultaneously converts all usages to respective symbolic name.
No functional change, just making the code human readable.

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/ctree.h b/ctree.h
index c1033c86..de4b1b7e 100644
--- a/ctree.h
+++ b/ctree.h
@@ -556,7 +556,7 @@ struct btrfs_node {
  * The slots array records the index of the item or block pointer
  * used while walking the tree.
  */
-
+enum { READA_NONE = 0, READA_BACK, READA_FORWARD };
 struct btrfs_path {
 	struct extent_buffer *nodes[BTRFS_MAX_LEVEL];
 	int slots[BTRFS_MAX_LEVEL];