btrfs_remove_free_space
btrfs_remove_free_space(block_group, start, chunk);
ret = btrfs_remove_free_space(cache, eb->start, eb->len);
ret = btrfs_remove_free_space(block_group, start, num_bytes);
int btrfs_remove_free_space(struct btrfs_block_group *block_group,
ret = btrfs_remove_free_space(cache, 0, SZ_4M);
ret = btrfs_remove_free_space(cache, SZ_1M, SZ_2M);
ret = btrfs_remove_free_space(cache, next_bitmap_offset - SZ_1M, SZ_2M);
ret = btrfs_remove_free_space(cache, 0, SZ_1M);
ret = btrfs_remove_free_space(cache, SZ_4M, SZ_1M);
ret = btrfs_remove_free_space(cache, SZ_512K, 3 * SZ_1M);
ret = btrfs_remove_free_space(cache, 3 * SZ_1M, SZ_4M);
ret = btrfs_remove_free_space(cache, bitmap_offset + SZ_1M, 5 * SZ_1M);
ret = btrfs_remove_free_space(cache, SZ_1M, 3 * SZ_1M);
ret = btrfs_remove_free_space(cache, 0, SZ_4M);
ret = btrfs_remove_free_space(cache,
ret = btrfs_remove_free_space(cache, 3 * SZ_1M, SZ_1M);
ret = btrfs_remove_free_space(cache, 0, SZ_1M);
ret = btrfs_remove_free_space(cache, SZ_2M, 4096);
ret = btrfs_remove_free_space(cache, 0, SZ_128M - 768 * SZ_1K);