linux-kernel - Re: [PATCH 0/4] io-controller: Use names rather than major:minor

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Message-ID: <20100327002404.GB9280@redhat.com>
Date:	Fri, 26 Mar 2010 20:24:04 -0400
From:	Vivek Goyal <vgoyal@...hat.com>
To:	Chad Talbott <ctalbott@...gle.com>
Cc:	Gui Jianfeng <guijianfeng@...fujitsu.com>, jens.axboe@...cle.com,
	mrubin@...gle.com, Li Zefan <lizf@...fujitsu.com>,
	linux-kernel@...r.kernel.org, dpshah@...gle.com,
	Nauman Rafique <nauman@...gle.com>
Subject: Re: [PATCH 0/4] io-controller: Use names rather than major:minor

On Fri, Mar 26, 2010 at 08:20:56PM -0400, Vivek Goyal wrote:

[..]
> > Which controllers are these?
> > 
> 
> linux-2.6/Documentation/cgroups/devices.txt
> 
> > > - Displaying both device major/minor and diskname is an option but that
> > >  makes the file format syntax little complicated and new rule setting
> > >  or removoal confusing.
> > 
> > A few messages back you mentioned that you preferred device names
> > because they would be better for users of the system.  If there was a
> > simple implementation, would you still be behind a new name-based
> > interface?  We could go that direction and maintain ABI by deprecating
> > current interface and making a new interface with names.
> > 
> > If you can't tell, I'm a big fan of using the name! :)  It's *much*
> > more consistent with the interfaces in /sys.
> 
> /sys provides facility to access device both through device number
> (/sys/dev/block/<major:minor>) and disk name (/sys/block/<diskname>). So
> I don't know why do you think it is more consistent with /sys if we
> use diskname.
> 
> In general user space seems to be accessing devices using device files.
> For example, blockdev utility.

One more example is "blktrace".

Thanks
Vivek

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