linux-ext4 - Re: [PATCH v8 25/25] iomap: Convert from readpages to readahead

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Message-ID: <20200226170728.GD22837@infradead.org>
Date:   Wed, 26 Feb 2020 09:07:28 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     "Darrick J. Wong" <darrick.wong@...cle.com>
Cc:     Matthew Wilcox <willy@...radead.org>,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, linux-btrfs@...r.kernel.org,
        linux-erofs@...ts.ozlabs.org, linux-ext4@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net, cluster-devel@...hat.com,
        ocfs2-devel@....oracle.com, linux-xfs@...r.kernel.org
Subject: Re: [PATCH v8 25/25] iomap: Convert from readpages to readahead

On Wed, Feb 26, 2020 at 09:04:25AM -0800, Darrick J. Wong wrote:
> > @@ -456,15 +435,8 @@ iomap_readpages(struct address_space *mapping, struct list_head *pages,
> >  			unlock_page(ctx.cur_page);
> >  		put_page(ctx.cur_page);
> >  	}
> > -
> > -	/*
> > -	 * Check that we didn't lose a page due to the arcance calling
> > -	 * conventions..
> > -	 */
> > -	WARN_ON_ONCE(!ret && !list_empty(ctx.pages));
> > -	return ret;
> 
> After all the discussion about "if we still have ctx.cur_page we should
> just stop" in v7, I'm surprised that this patch now doesn't say much of
> anything, not even a WARN_ON()?

The code quoted above puts the cur_page reference.  By dropping the
odd refactoring patch there is no need to check for cur_page being
left as a special condition as that still is the normal loop exit
state and properly handled, just as in the original iomap code.