btrfs_find_chunk_map
map = btrfs_find_chunk_map(fs_info, chunk_offset, 1);
map = btrfs_find_chunk_map(fs_info, key->objectid, key->offset);
map = btrfs_find_chunk_map(fs_info, start, 1);
map = btrfs_find_chunk_map(fs_info, block_group->start, 1);
map = btrfs_find_chunk_map(fs_info, start, length);
map = btrfs_find_chunk_map(fs_info, bg->start, bg->length);
map = btrfs_find_chunk_map(fs_info, logical, length);
map = btrfs_find_chunk_map(fs_info, logical, 1);
map = btrfs_find_chunk_map(fs_info, 0, U64_MAX);
map = btrfs_find_chunk_map(fs_info, next_start, U64_MAX - next_start);
map = btrfs_find_chunk_map(fs_info, chunk_offset, 1);
struct btrfs_chunk_map *btrfs_find_chunk_map(struct btrfs_fs_info *fs_info,
map = btrfs_find_chunk_map(fs_info, logical, length);