linux-kernel - Re: [PATCH] ext4: add a line break for proc mb

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Date:	Wed, 3 Feb 2016 11:32:33 -0800
From:	"Darrick J. Wong" <darrick.wong@...cle.com>
To:	Joe Perches <joe@...ches.com>
Cc:	Huaitong Han <huaitong.han@...el.com>, tytso@....edu,
	adilger.kernel@...ger.ca, linux-ext4@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ext4: add a line break for proc mb_groups display

On Wed, Feb 03, 2016 at 10:30:32AM -0800, Joe Perches wrote:
> On Wed, 2016-02-03 at 10:13 -0800, Darrick J. Wong wrote:
> > On Wed, Feb 03, 2016 at 09:19:06PM +0800, Huaitong Han wrote:
> > > This patch adds a line break for proc mb_groups display.
> 
> Using 2 lines for output might break any existing users.
> 
> Are there any?

It's a multiline file if you have more than one blockgroup; this just makes it
so that you don't have to special-case BG 0.

IOW: mb_groups scripts already had to parse multiple lines, and most likely any
script parsing it would inject a newline after the header.

--D

> 
> > > 
> > > Signed-off-by: Huaitong Han <huaitong.han@...el.com>
> > > ---
> > >  fs/ext4/mballoc.c | 2 +-
> > >  1 file changed, 1 insertion(+), 1 deletion(-)
> > > 
> > > diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
> > > index 61eaf74..4424b7b 100644
> > > --- a/fs/ext4/mballoc.c
> > > +++ b/fs/ext4/mballoc.c
> > > @@ -2285,7 +2285,7 @@ static int ext4_mb_seq_groups_show(struct seq_file *seq, void *v)
> > >  	if (group == 0)
> > >  		seq_puts(seq, "#group: free  frags first ["
> > >  			      " 2^0   2^1   2^2   2^3   2^4   2^5   2^6  "
> > > -			      " 2^7   2^8   2^9   2^10  2^11  2^12  2^13  ]");
> > > +			      " 2^7   2^8   2^9   2^10  2^11  2^12  2^13  ]\n");
> > 
> > Oh, heh.
> > 
> > Reviewed-by: Darrick J. Wong <darrick.wong@...cle.com>
> > 
> > --D
> > 
> > >  
> > >  	i = (sb->s_blocksize_bits + 2) * sizeof(sg.info.bb_counters[0]) +
> > >  		sizeof(struct ext4_group_info);
> 
> --
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