linux-ext4 - Re: ext4_da_block_invalidatepages() question

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Message-ID: <20100127122528.GB3149@quack.suse.cz>
Date:	Wed, 27 Jan 2010 13:25:28 +0100
From:	Jan Kara <jack@...e.cz>
To:	Wu Fengguang <fengguang.wu@...el.com>
Cc:	Jan Kara <jack@...e.cz>,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>,
	"tytso@....edu" <tytso@....edu>
Subject: Re: ext4_da_block_invalidatepages() question

On Wed 27-01-10 09:53:39, Wu Fengguang wrote:
> On Tue, Jan 26, 2010 at 08:32:22AM -0700, Jan Kara wrote:
> 
> > @@ -2127,17 +2127,16 @@ static void ext4_da_block_invalidatepages(struct mpage_da_data *mpd,
> >  			break;
> >  		for (i = 0; i < nr_pages; i++) {
> >  			struct page *page = pvec.pages[i];
> > -			index = page->index;
> > -			if (index > end)
> > +			if (page->index > end)
> >  				break;
> > -			index++;
> > -
> >  			BUG_ON(!PageLocked(page));
> >  			BUG_ON(PageWriteback(page));
> >  			block_invalidatepage(page, 0);
> >  			ClearPageUptodate(page);
> >  			unlock_page(page);
> >  		}
> > +		index = pvec.pages[nr_pages - 1]->index + 1;
> > +		pagevec_release(&pvec);
> >  	}
> >  	return;
> >  }
> 
> The patch includes a cleanup and a bug fix, both looks OK to me.
> But if we can split it, the bug fix would be good candidate for
> the stable kernel?
  I don't think we want to push this to -stable kernel. As I wrote, this
code is called only in case user is going to loose written data which is a
bug on it's own so loosing a few page references is nothing compared to
that.

									Honza
-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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