[PATCH 4/4] btrfs-progs: check: Remove duplicated and commented functions

[Nikolay Borisov <nborisov@suse.com>]

Commit 756105181e57 ("btrfs-progs: check: supplement extent backref
list with rbtree") changed the backref implementation to use rb tree
and also commented the old implementations. It's been almost 2 years
since that change and it's unlikely the old version will ever be used,
so just remove it.

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
---
 check/main.c | 69 ----------------------------------------------------
 1 file changed, 69 deletions(-)

diff --git a/check/main.c b/check/main.c
index 731c21d364d7..05ba9819c58e 100644
--- a/check/main.c
+++ b/check/main.c
@@ -4385,36 +4385,6 @@ static int check_block(struct btrfs_root *root,
 	return ret;
 }
 
-#if 0
-static struct tree_backref *find_tree_backref(struct extent_record *rec,
-						u64 parent, u64 root)
-{
-	struct list_head *cur = rec->backrefs.next;
-	struct extent_backref *node;
-	struct tree_backref *back;
-
-	while (cur != &rec->backrefs) {
-		node = to_extent_backref(cur);
-		cur = cur->next;
-		if (node->is_data)
-			continue;
-		back = to_tree_backref(node);
-		if (parent > 0) {
-			if (!node->full_backref)
-				continue;
-			if (parent == back->parent)
-				return back;
-		} else {
-			if (node->full_backref)
-				continue;
-			if (back->root == root)
-				return back;
-		}
-	}
-	return NULL;
-}
-#endif
-
 static struct tree_backref *alloc_tree_backref(struct extent_record *rec,
 						u64 parent, u64 root)
 {
@@ -4434,45 +4404,6 @@ static struct tree_backref *alloc_tree_backref(struct extent_record *rec,
 	return ref;
 }
 
-#if 0
-static struct data_backref *find_data_backref(struct extent_record *rec,
-						u64 parent, u64 root,
-						u64 owner, u64 offset,
-						int found_ref,
-						u64 disk_bytenr, u64 bytes)
-{
-	struct list_head *cur = rec->backrefs.next;
-	struct extent_backref *node;
-	struct data_backref *back;
-
-	while (cur != &rec->backrefs) {
-		node = to_extent_backref(cur);
-		cur = cur->next;
-		if (!node->is_data)
-			continue;
-		back = to_data_backref(node);
-		if (parent > 0) {
-			if (!node->full_backref)
-				continue;
-			if (parent == back->parent)
-				return back;
-		} else {
-			if (node->full_backref)
-				continue;
-			if (back->root == root && back->owner == owner &&
-			    back->offset == offset) {
-				if (found_ref && node->found_ref &&
-				    (back->bytes != bytes ||
-				    back->disk_bytenr != disk_bytenr))
-					continue;
-				return back;
-			}
-		}
-	}
-	return NULL;
-}
-#endif
-
 static struct data_backref *alloc_data_backref(struct extent_record *rec,
 						u64 parent, u64 root,
 						u64 owner, u64 offset,
-- 
2.17.1