[PATCH 6/7] btrfs: cleanup: removed unused 'btrfs_reada_detach'

[Sergei Trofimovich <slyich@gmail.com>]

From: Sergei Trofimovich <slyfox@gentoo.org>

Found by uselex.rb:
> btrfs_reada_detach: [R]: exported from: fs/btrfs/btrfs.o fs/btrfs/built-in.o fs/btrfs/reada.o

Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
---
 fs/btrfs/ctree.h | 1 -
 fs/btrfs/reada.c | 9 +--------
 2 files changed, 1 insertion(+), 9 deletions(-)

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index e91ab9e..f35e086 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -3861,7 +3861,6 @@ struct reada_control {
 struct reada_control *btrfs_reada_add(struct btrfs_root *root,
 			      struct btrfs_key *start, struct btrfs_key *end);
 int btrfs_reada_wait(void *handle);
-void btrfs_reada_detach(void *handle);
 int btree_readahead_hook(struct btrfs_root *root, struct extent_buffer *eb,
 			 u64 start, int err);
 
diff --git a/fs/btrfs/reada.c b/fs/btrfs/reada.c
index 1031b69..c41d470 100644
--- a/fs/btrfs/reada.c
+++ b/fs/btrfs/reada.c
@@ -37,7 +37,7 @@
  * To trigger a readahead, btrfs_reada_add must be called. It will start
  * a read ahead for the given range [start, end) on tree root. The returned
  * handle can either be used to wait on the readahead to finish
- * (btrfs_reada_wait), or to send it to the background (btrfs_reada_detach).
+ * (btrfs_reada_wait).
  *
  * The read ahead works as follows:
  * On btrfs_reada_add, the root of the tree is inserted into a radix_tree.
@@ -979,10 +979,3 @@ int btrfs_reada_wait(void *handle)
 	return 0;
 }
 #endif
-
-void btrfs_reada_detach(void *handle)
-{
-	struct reada_control *rc = handle;
-
-	kref_put(&rc->refcnt, reada_control_release);
-}
-- 
1.8.3.2