hi Lustre use the struct brw_page to trigger io. struct brw_page { long off; struct page * page; long len ; } Whether the data struct support the situation when (off & PAGE_SIZE-1) !=0; Such as that off=100; Thanks in advance. Songtao.L _________________________________________________________________ Ãâ·ÑÏÂÔØ MSN Explorer: http://explorer.msn.com/lccn/