Hi all
i have read about page cache
and about bio biovec page relation too
but in all that i have a minor confusion
what i know is -- pl ignore faults in language used -- its raw -- i know that
1)page consists of many biovecs --
2)each biovec is mentioning continuous data on storage device-- to be transferred
3)many bio vecs coming from different pages -- makes a single bio --
where in a bio contains the request for continuous data (on storage device )
to be transferred ...i understood scatter gather ..i have read things from different place
so
in all that i am missing some links ---
1) How page is related to block on disk ?--
2) is block concept totally vanished in all this discussion ?
3) if a single bio is transferred at a time -- then is bio equivalent to a block ?
or no relation of block and bio ?
4) if bio is equivalent to one block -- then finally we are transferring block only .... then where abt that benefit of shifting from buffer cache to page cache ....isnt it ??
5) page is related to a file -- a single page can contain only one file's data .... is that true ?
or a page can contain some bio_vecs of file1 and some bio_vecs of other file2 ??
pl help in clarification
thanks
nidhi
--
Thanks & Regards
Nidhi Mittal Hada
