Reading directory entries from BMAP

[cyjoyp <cyjoyp@gmail.com>]

Hi there,
          I am a beginner in learning XFS file system.. I have a doubt, dont
know whether is silly..If you could help me with this...Thank you..

   An extent is 128 bit in size and uses the following struct,
  
        typedef struct xfs_bmbt_irec {
                      xfs_fileoff_t              br_startoff;
                      xfs_fsblock_t            br_startblock;
                      xfs_filblks_t              br_blockcount;
                      xfs_exntst_t             br_state;
                     }
     
     I have got in to the BMAP position after traversing the BTREE..
     The BMAP has a leaf and no other siblings..
     I have the extents for directory entries stored in the BMAP..
     This is where is struck badly..
   
    Now I have a 16 byte value from which I can calculate the block count
,AG number ,etc...
             00 00 00 01 00 00 02 00 00 00 00 00 02 A0 00 02
   In this case I lan up some where else instead going to the block of
directory entries..
   This br_startoff (logical offset) is causing a difference...I am going
wrong somwhere in this case..
      
     
     Could you please tell me br_startoff does really mean???
      
   
             
     

  
        

 
             
 
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