linux-ext4 - Re: [PATCH] Add extent conversion support to chattr

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Date:	Fri, 12 Sep 2008 14:57:49 +0530
From:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
To:	Andreas Dilger <adilger@....com>
Cc:	cmm@...ibm.com, tytso@....edu, sandeen@...hat.com,
	linux-ext4@...r.kernel.org
Subject: Re: [PATCH] Add extent conversion support to chattr

On Fri, Sep 12, 2008 at 03:17:13AM -0600, Andreas Dilger wrote:
> On Sep 12, 2008  14:34 +0530, Aneesh Kumar wrote:
> > -		_("Usage: %s [-RVf] [-+=AacDdijsSu] [-v version] files...\n"),
> > +		_("Usage: %s [-RVf] [-+=AacDdijsSue] [-v version] files...\n"),
> 
> Please keep options in alphabetical order.
> 
> > @@ -105,6 +105,7 @@ static const struct flags_char flags_array[] = {
> >  	{ EXT2_UNRM_FL, 'u' },
> >  	{ EXT2_NOTAIL_FL, 't' },
> >  	{ EXT2_TOPDIR_FL, 'T' },
> > +	{ EXT4_EXTENTS_FL, 'e'},
> 
> I'd also prefer to keep these in alphabetical order, which they almost are.
> 
> > @@ -199,7 +201,22 @@ static int change_attributes(const char * name)
> >  	if (set) {
> > +		if (extent_file && !(sf & EXT4_EXTENTS_FL)) {
> > +			if (!silent)
> > +				com_err(program_name, 0,
> > +				_("Clearing extent flag not supported on %s"),
> > +					name);
> > +			return -1;
> > +		}
> 
> Why not just try to set this flag and let the kernel decide what is
> possible?
> 

The motivation is to give a clear message that we still don't support
clearing extent flags. If we pass it to the kernel we will get
operation not supported error which would confuse the user who does
chattr -de f1

-aneesh
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