From: Chao Yu <chao2.yu@samsung.com>
Subject: Re: [PATCH] f2fs: use ra_meta_pages to simplify
 readahead code in restore_node_summary
Date: Wed, 17 Dec 2014 18:04:51 +0800
Message-ID: <001c01d019e1$1c949560$55bdc020$@samsung.com>
References: <003e01d0152b$a7fd0b60$f7f72220$@samsung.com>
	<20141217060436.GA7624@jaegeuk-mac02.mot-mobility.com>
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Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-f2fs-devel@lists.sourceforge.net
To: 'Jaegeuk Kim' <jaegeuk@kernel.org>
In-reply-to: <20141217060436.GA7624@jaegeuk-mac02.mot-mobility.com>
Content-language: zh-cn
Errors-To: linux-f2fs-devel-bounces@lists.sourceforge.net

Hi Jaegeuk,

> -----Original Message-----
> From: Jaegeuk Kim [mailto:jaegeuk@kernel.org]
> Sent: Wednesday, December 17, 2014 2:05 PM
> To: Chao Yu
> Cc: Changman Lee; linux-f2fs-devel@lists.sourceforge.net; linux-fsdevel@vger.kernel.org;
> linux-kernel@vger.kernel.org
> Subject: Re: [f2fs-dev][PATCH] f2fs: use ra_meta_pages to simplify readahead code in
> restore_node_summary
> 
> Hi Chao,
> 
> On Thu, Dec 11, 2014 at 06:16:27PM +0800, Chao Yu wrote:
> > Use more common function ra_meta_pages() with META_POR to readahead node blocks
> > in restore_node_summary() instead of ra_sum_pages(), hence we can simplify the
> > readahead code there, and also we can remove unused function ra_sum_pages().
> >
> > Signed-off-by: Chao Yu <chao2.yu@samsung.com>
> > ---
> >  fs/f2fs/node.c | 67 ++++++++++++----------------------------------------------
> >  1 file changed, 14 insertions(+), 53 deletions(-)

[snip]

> > -		invalidate_mapping_pages(inode->i_mapping, addr,
> > -							addr + nrpages);
> > +		truncate_inode_pages_range(META_MAPPING(sbi),
> > +						addr, addr + nrpages);
> 
> I found a bug here. :)

Thank you for your review! :)

> The truncate_inode_pages_range uses start and end parameters as byte offsets.
> So, you should use like (addr << PAGE_CACHE_SHIFT).
> 

Yes, you're correct, I will fix this and send v2 patch.

Regards,
Yu

> Thanks,
> 
> >  	}
> > -	return err;
> > +	return 0;
> >  }
> >
> >  static void remove_nats_in_journal(struct f2fs_sb_info *sbi)
> > --
> > 2.1.2


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