linux-kernel - Re: [PATCH] rbd: replace the rbd sysfs interface

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Message-ID: <Pine.LNX.4.64.1012011601440.8183@cobra.newdream.net>
Date:	Wed, 1 Dec 2010 16:11:44 -0800 (PST)
From:	Sage Weil <sage@...dream.net>
To:	Greg KH <greg@...ah.com>
cc:	Yehuda Sadeh <yehuda@...newdream.net>, ceph-devel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] rbd: replace the rbd sysfs interface

On Wed, 1 Dec 2010, Greg KH wrote:
> On Wed, Dec 01, 2010 at 12:08:15PM -0800, Sage Weil wrote:
> > On Wed, 1 Dec 2010, Greg KH wrote:
> > > >  /sys/bus/rbd/{add,remove}
> > > >  /sys/bus/rbd/devices/<devid>/                 <-- struct device
> > > >  /sys/bus/rbd/devices/<devid>/{some dev attrs}
> > > >  /sys/bus/rbd/devices/<devid>/snap_<snapid>/   <-- struct device
> > > >  /sys/bus/rbd/devices/<devid>/snap_<snapid>/{some snap attrs}
> > > > 
> > > > This works, and I is (I hope) using struct device properly.  The only 
> > > > problem, purely from a user interface standpoint, is that the snaps are 
> > > > mixed in with attributes, so anybody wanting to iterate over snaps needs 
> > > > to do something crufty like
> > > > 
> > > >  $ for snap in `ls /sys/bus/rbd/devices/$id | grep ^snap_ | cut -c 6-`; do ...
> > > 
> > > What's wrong with:
> > > 	for snap in `ls /sys/bus/rbd/devices/$id/snap_*`; do ...
> > > instead?
> > 
> > Yeah, it's really the 'cut -c 6-' bit that I was hoping to avoid.  But it 
> > snaps/ simply doesn't map onto the sysfs paradigm cleanly, that's fine.
> > 
> > That being the case, can we get an Acked-by on the current approach/patch?  
> 
> Yes, please feel free to add:
> 	Acked-by: Greg Kroah-Hartman <gregkh@...e.de> to the patch.

Great.  Thanks for all your time and help!
 
> > Then I can send something Linus and let him decide what to do for .37.
> 
> It's pretty late for .37.  Why not disable the option for now, and then
> get this patch in for .38 as it's quite a big change?  I'd recommend
> doing that.

Yeah, it's late, but it would be nice to get RBD out there for people to 
try sooner rather than later (it's already been a couple kernel cycles out 
of tree).  But I suspect Linus will agree with you... :)

Anyway, thanks again!
sage
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