linux-ext4 - Re: [PATCH 1/2] ext3: kill 2 useless magic numbers

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Date:	Thu, 12 Jun 2008 16:11:34 -0700
From:	Mingming Cao <cmm@...ibm.com>
To:	Andreas Dilger <adilger@....com>
Cc:	Li Zefan <lizf@...fujitsu.com>, "Theodore Ts'o" <tytso@....edu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-ext4@...r.kernel.org
Subject: Re: [PATCH 1/2] ext3: kill 2 useless magic numbers

On Thu, 2008-06-12 at 00:38 -0600, Andreas Dilger wrote:
> On Jun 12, 2008  09:18 +0800, Li Zefan wrote:
> > dx_root_limit() will never return 20, and I can't figure out
> > what 20 stands for. This function has never changed since htree
> > directory indexing was merged.
> > 
> > Similar for dx_node_limit() and the magic 22.
> 
> This was for testing htree split code more aggressively, but can be
> removed.
> 
> Acked-by: Andreas Dilger <adilger@....com>

I added the ext4 version to the patch queue

Mingming
> 
> > Signed-off-by: Li Zefan <lizf@...fujitsu.com>
> > ---
> >  fs/ext3/namei.c |    4 ++--
> >  1 files changed, 2 insertions(+), 2 deletions(-)
> > 
> > diff --git a/fs/ext3/namei.c b/fs/ext3/namei.c
> > index 0b8cf80..d282ea8 100644
> > --- a/fs/ext3/namei.c
> > +++ b/fs/ext3/namei.c
> > @@ -240,13 +240,13 @@ static inline unsigned dx_root_limit (struct inode *dir, unsigned infosize)
> >  {
> >  	unsigned entry_space = dir->i_sb->s_blocksize - EXT3_DIR_REC_LEN(1) -
> >  		EXT3_DIR_REC_LEN(2) - infosize;
> > -	return 0? 20: entry_space / sizeof(struct dx_entry);
> > +	return entry_space / sizeof(struct dx_entry);
> >  }
> >  
> >  static inline unsigned dx_node_limit (struct inode *dir)
> >  {
> >  	unsigned entry_space = dir->i_sb->s_blocksize - EXT3_DIR_REC_LEN(0);
> > -	return 0? 22: entry_space / sizeof(struct dx_entry);
> > +	return entry_space / sizeof(struct dx_entry);
> >  }
> >  
> >  /*
> > -- 
> > 1.5.4.rc3
> > 
> > --
> > To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
> > the body of a message to majordomo@...r.kernel.org
> > More majordomo info at  http://vger.kernel.org/majordomo-info.html
> 
> Cheers, Andreas
> --
> Andreas Dilger
> Sr. Staff Engineer, Lustre Group
> Sun Microsystems of Canada, Inc.
> 
> --
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