On Tuesday May 27, bo@anthologysolutions.com wrote:
> Neil,
>
> It improved a lot for the sync I/O.
> However, I am looking for a solution to handle
> the regular async I/O with a page data on the
> same sector repeatedly like writing the MD SB
> data to disk without flushing.
This is a filesystem question. Not a raid question.
I would just:
getblk
copy new data in
mark update
mark dirty
release block
and it will eventually be flushed to disk.
If you want to written sooner, call
submit_bh
NeilBrown
>
> The follwing is my simple algorithm for it;
>
> bh=getblk(dev, block, size);
> if (buffer_uptodate(bh)) { /* still in cache, not flushed yet */
> bh->b_data = "updated data";
> brelse(bh);
> }
> else { /* all were flushed or new */
> .
> .
> mark_buffer_uptodate(bh,1);
> mark_buffer_dirty(bh);
> generic_make_request(rw, &bh);
> }
>
> Please give me your suggestion or comment.
>
>
> Bo
> ----- Original Message -----
> From: "Neil Brown" <neilb@cse.unsw.edu.au>
> To: "bmoon" <bo@anthologysolutions.com>
> Cc: <linux-raid@vger.kernel.org>
> Sent: Monday, May 26, 2003 7:47 PM
> Subject: Re: How do we handle the same but uptodated data to disk cache?
>
>
> > On Monday May 26, bo@anthologysolutions.com wrote:
> > > Hello,
> > >
> > > I want to write the data to the fixed sector with the same size
> frequently
> > > just like MD super block, but I do not want to sync and flush the dev
> > > on each write.
> > >
> > > For example, to write md super block in /drivers/md/md.c
> >
> > I suggest you look at a newer md.c. With 2.4.21pre or 2.5.* have
> > "sync_page_io" which does what you want more effectively.
> >
> > NeilBrown
> >
>
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