Btrfs: use helper for logical resolve

We already have a helper, iterate_inodes_from_logical(), for logical resolve,
so just use it.
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>

fs/btrfs/ioctl.c

@@ -3210,12 +3210,9 @@ static long btrfs_ioctl_logical_to_ino(struct btrfs_root *root,
 {
 	int ret = 0;
 	int size;
-	u64 extent_item_pos;
-	u64 flags = 0;
 	struct btrfs_ioctl_logical_ino_args *loi;
 	struct btrfs_data_container *inodes = NULL;
 	struct btrfs_path *path = NULL;
-	struct btrfs_key key;
 
 	if (!capable(CAP_SYS_ADMIN))
 		return -EPERM;
@@ -3241,23 +3238,13 @@ static long btrfs_ioctl_logical_to_ino(struct btrfs_root *root,
 		goto out;
 	}
 
-	ret = extent_from_logical(root->fs_info, loi->logical, path, &key,
-				  &flags);
-	btrfs_release_path(path);
-
-	if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK)
+	ret = iterate_inodes_from_logical(loi->logical, root->fs_info, path,
+					  build_ino_list, inodes);
+	if (ret == -EINVAL)
 		ret = -ENOENT;
 	if (ret < 0)
 		goto out;
 
-	extent_item_pos = loi->logical - key.objectid;
-	ret = iterate_extent_inodes(root->fs_info, key.objectid,
-					extent_item_pos, 0, build_ino_list,
-					inodes);
-
-	if (ret < 0)
-		goto out;
-
 	ret = copy_to_user((void *)(unsigned long)loi->inodes,
 			   (void *)(unsigned long)inodes, size);
 	if (ret)