函数fsp_alloc_seg_inode_page

 

分配一个新的inode page

/**********************************************************************//**
Allocates a new file segment inode page.
@return    TRUE if could be allocated */
static
ibool
fsp_alloc_seg_inode_page(
/*=====================*/
    fsp_header_t*    space_header,    /*!< in: space header */
    mtr_t*        mtr)        /*!< in: mini-transaction handle */
{
    fseg_inode_t*    inode;
    buf_block_t*    block;
    page_t*        page; //详见
    ulint        space;
    ulint        zip_size;
    ulint        i;

    ut_ad(page_offset(space_header) == FSP_HEADER_OFFSET);
    /**
     *
     *
     */
    space = page_get_space_id(page_align(space_header)); //详见  page_align详见

    zip_size = dict_table_flags_to_zip_size(mach_read_from_4(FSP_SPACE_FLAGS + space_header));

    block = fsp_alloc_free_page(space, zip_size, 0, mtr, mtr); //详见
     if (block == NULL) {
        return(FALSE);
    }
    buf_block_dbg_add_level(block, SYNC_FSP_PAGE);
    ut_ad(rw_lock_get_x_lock_count(&block->lock) == 1);
    block->check_index_page_at_flush = FALSE;
    page = buf_block_get_frame(block);

    //#define FIL_PAGE_TYPE 24，页类型为 inodb page
    mlog_write_ulint(page + FIL_PAGE_TYPE, FIL_PAGE_INODE,MLOG_2BYTES, mtr);

    //for循环86次 for (i = 0; i < FSP_SEG_INODES_PER_PAGE(zip_size); i++) {
        inode = fsp_seg_inode_page_get_nth_inode(page, i,zip_size, mtr);
        mlog_write_ull(inode + FSEG_ID, 0, mtr);
    }
    /**
     *#define FSP_SEG_INODES_FREE (32 + 4 * FLST_BASE_NODE_SIZE
     *#define FLST_BASE_NODE_SIZE (4 + 2 * FIL_ADDR_SIZE)
     *#define FIL_ADDR_SIZE 6
     *
     *
     
  
 
 
 
     *#define FSP_SEG_INODES_FREE (32 + 4 * FLST_BASE_NODE_SIZE)
     *#define FLST_BASE_NODE_SIZE (4 + 2 * FIL_ADDR_SIZE)
     *#define FIL_ADDR_SIZE 6
     */
　

    *#define FSEG_INODE_PAGE_NODE FSEG_PAGE_DATA
 *#define FSEG_PAGE_DATA FIL_PAGE_DATA
 *#define FIL_PAGE_DATA 38

    
    

    
    
    //FSP_SEG_INODES_FREE 134 所在页为 fsp 页
  
    //FSEG_INODE_PAGE_NODE 38 所在页为inode 页

　　flst_add_last(space_header + FSP_SEG_INODES_FREE,page + FSEG_INODE_PAGE_NODE, mtr);//详见 

   return(TRUE); 
}