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.
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
>
-
To unsubscribe from this list: send the line "unsubscribe linux-raid" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
