函数fsp_header_init

/**********************************************************************//**
Initializes the space header of a new created space and creates also the
insert buffer tree root if space == 0. */
UNIV_INTERN
void
fsp_header_init(
/*============*/
    ulint    space,        /*!< in: space id */
    ulint    size,        /*!< in: current size in blocks */
    mtr_t*    mtr)        /*!< in: mini-transaction handle */
{
    fsp_header_t*    header;
    buf_block_t*    block;
    page_t*        page;
    ulint        flags;
    ulint        zip_size;

    ut_ad(mtr);

    mtr_x_lock(fil_space_get_latch(space, &flags), mtr);

    zip_size = dict_table_flags_to_zip_size(flags);
    block = buf_page_create(space, , zip_size, mtr);
    buf_page_get(space, zip_size, , RW_X_LATCH, mtr);
    buf_block_dbg_add_level(block, SYNC_FSP_PAGE);

    /* The prior contents of the file page should be ignored */
　　 /**     *初始化block中的page数据     *mach_write_to_4(page + FIL_PAGE_OFFSET, buf_block_get_page_no(block));     *mach_write_to_4(page + FIL_PAGE_ARCH_LOG_NO_OR_SPACE_ID,buf_block_get_space(block));     */
    fsp_init_file_page(block, mtr);//详见
    page = buf_block_get_frame(block);

    mlog_write_ulint(page + FIL_PAGE_TYPE, FIL_PAGE_TYPE_FSP_HDR,
             MLOG_2BYTES, mtr);

    header = FSP_HEADER_OFFSET + page;

    mlog_write_ulint(header + FSP_SPACE_ID, space, MLOG_4BYTES, mtr);
    mlog_write_ulint(header + FSP_NOT_USED, , MLOG_4BYTES, mtr);

    mlog_write_ulint(header + FSP_SIZE, size, MLOG_4BYTES, mtr);
    mlog_write_ulint(header + FSP_FREE_LIMIT, , MLOG_4BYTES, mtr);
    mlog_write_ulint(header + FSP_SPACE_FLAGS, flags,MLOG_4BYTES, mtr);
    mlog_write_ulint(header + FSP_FRAG_N_USED, , MLOG_4BYTES, mtr);

    flst_init(header + FSP_FREE, mtr);
    flst_init(header + FSP_FREE_FRAG, mtr);
    flst_init(header + FSP_FULL_FRAG, mtr);
    flst_init(header + FSP_SEG_INODES_FULL, mtr);
    flst_init(header + FSP_SEG_INODES_FREE, mtr);

    mlog_write_ull(header + FSP_SEG_ID, , mtr);
    ) {        /**         *expend文件大小，分配8M内存，并写到硬盘中         *以64为递增,初始化每个FSP page/XDES page中的第一个xdes entry         *         *         */
        fsp_fill_free_list(FALSE, space, header, mtr);//详见
        btr_create(DICT_CLUSTERED | DICT_UNIVERSAL |, , DICT_IBUF_ID_MIN + space,dict_ind_redundant, mtr);
    } else {
        fsp_fill_free_list(TRUE, space, header, mtr);
    }
}