btrfs_previous_item
ret = btrfs_previous_item(root, path, key->objectid, key->type);
int btrfs_previous_item(struct btrfs_root *root,
ret = btrfs_previous_item(root, path, ino, BTRFS_EXTENT_DATA_KEY);
ret = btrfs_previous_item(stripe_root, path, start,
ret = btrfs_previous_item(root, path, ino, BTRFS_DIR_INDEX_KEY);
ret = btrfs_previous_item(root, path, ino, BTRFS_DIR_INDEX_KEY);
ret = btrfs_previous_item(root, path, ino, BTRFS_EXTENT_DATA_KEY);
ret = btrfs_previous_item(root, path, key.objectid,
ret = btrfs_previous_item(fs_info->chunk_root, path,
ret = btrfs_previous_item(chunk_root, path, key.objectid,
ret = btrfs_previous_item(chunk_root, path, 0,
ret = btrfs_previous_item(root, path, 0, key.type);