btrfs_check_data_free_space
ret = btrfs_check_data_free_space(BTRFS_I(inode), &data_reserved, 0,
ret = btrfs_check_data_free_space(inode, reserved, start, len, false);
int btrfs_check_data_free_space(struct btrfs_inode *inode,
ret = btrfs_check_data_free_space(BTRFS_I(inode),
ret = btrfs_check_data_free_space(inode, data_reserved, start, *len, nowait);
ret = btrfs_check_data_free_space(inode, &data_reserved, page_start,
ret = btrfs_check_data_free_space(inode, &data_reserved, block_start,