linux-kernel - RE: [f2fs-dev] [PATCH] f2fs: fix wrong number of max

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Message-id: <000001cf5a13$5d8d6620$18a83260$@samsung.com>
Date:	Thu, 17 Apr 2014 16:01:20 +0800
From:	Chao Yu <chao2.yu@...sung.com>
To:	jaegeuk.kim@...sung.com
Cc:	linux-f2fs-devel@...ts.sourceforge.net,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: RE: [f2fs-dev] [PATCH] f2fs: fix wrong number of max_nid when init

Hi,

> -----Original Message-----
> From: Jaegeuk Kim [mailto:jaegeuk.kim@...sung.com]
> Sent: Thursday, April 17, 2014 3:17 PM
> To: Chao Yu
> Cc: linux-f2fs-devel@...ts.sourceforge.net; linux-fsdevel@...r.kernel.org;
> linux-kernel@...r.kernel.org
> Subject: Re: [f2fs-dev] [PATCH] f2fs: fix wrong number of max_nid when init
> 
> Hi,
> 
> 2014-04-17 (목), 14:27 +0800, Chao Yu:
> > Since max_nid value was minus three in previous commit:
> > 'b63da15e8b475245026bdf2096853683f189706b', Our last three nids could not be
> > used ever, but 0/node nid/meta nid is still occupied.
> > And also our ra_meta_pages() could not readahead the last block of NAT.
> 
> What is the root problem in there?

The last one is the root problem, I will submit another patch to fix it.

> IIRC, the max_nid should not be turned back since that can cause an
> infinite loop during build_free_nids() under a test using whole the
> nids.

Got it, thanks for your explanation.

Regards.

> 
> > Let's fix the wrong calculation of this value, and left the reserved nids there.
> >
> > Signed-off-by: Chao Yu <chao2.yu@...sung.com>
> > ---
> >  fs/f2fs/node.c |    2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
> > index 84f9b7b..3f0bb50 100644
> > --- a/fs/f2fs/node.c
> > +++ b/fs/f2fs/node.c
> > @@ -1860,7 +1860,7 @@ static int init_node_manager(struct f2fs_sb_info *sbi)
> >  	nat_blocks = nat_segs << le32_to_cpu(sb_raw->log_blocks_per_seg);
> >
> >  	/* not used nids: 0, node, meta, (and root counted as valid node) */
> > -	nm_i->max_nid = NAT_ENTRY_PER_BLOCK * nat_blocks - 3;
> > +	nm_i->max_nid = NAT_ENTRY_PER_BLOCK * nat_blocks;
> >  	nm_i->fcnt = 0;
> >  	nm_i->nat_cnt = 0;
> >  	nm_i->ram_thresh = DEF_RAM_THRESHOLD;
> 
> --
> Jaegeuk Kim
> Samsung

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