linux-kernel - RE: [f2fs-dev][PATCH] f2fs: use ra_meta_pages to simplify readahead code in restore_node

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Message-id: <001c01d019e1$1c949560$55bdc020$@samsung.com>
Date:	Wed, 17 Dec 2014 18:04:51 +0800
From:	Chao Yu <chao2.yu@...sung.com>
To:	'Jaegeuk Kim' <jaegeuk@...nel.org>
Cc:	'Changman Lee' <cm224.lee@...sung.com>,
	linux-f2fs-devel@...ts.sourceforge.net,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: RE: [f2fs-dev][PATCH] f2fs: use ra_meta_pages to simplify readahead
 code in restore_node_summary

Hi Jaegeuk,

> -----Original Message-----
> From: Jaegeuk Kim [mailto:jaegeuk@...nel.org]
> Sent: Wednesday, December 17, 2014 2:05 PM
> To: Chao Yu
> Cc: Changman Lee; linux-f2fs-devel@...ts.sourceforge.net; linux-fsdevel@...r.kernel.org;
> linux-kernel@...r.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@...sung.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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