Re: [Xen-devel] [PATCH] libxl: stat the path for all non-qdisk backends (including unknown)

[David Scott <dave.scott@xxxxxxxxxxxxx>]

On 26/04/13 16:33, Ian Campbell wrote:
> On Fri, 2013-04-26 at 15:42 +0100, George Dunlap wrote:
> > On 26/04/13 15:39, Roger Pau Monne wrote:
> > > On 26/04/13 16:29, Ian Campbell wrote:
> > > > On Fri, 2013-04-26 at 15:17 +0100, Sylvain Munaut wrote:
> > > > > > Since the intention of that commit was to allow for qdisk backends with no
> > > > > > explicit file in dom0 (i.e. network remote backend such as ceph) the lowest
> > > > > > impact fix appears to be to make that explicit. This should probably be
> > > > > > revisited to rationalize the probing.
> > > > > What about the remote disk case of blktap ?  blktap2.5 supports NBD
> > > > > already AFAIK
> > > > > and I'm pretty sure I'll hit that same stat issue soon for another
> > > > > remote blktap case.
> > > > Right, sounds like I should have gone with my first instinct which was:
> > > >
> > > > 8<------------------------------------------------------------
> > > >
> > > >   From 884beff4a897d785f61705dcfa2f048536982d7c Mon Sep 17 00:00:00 2001
> > > > From: Ian Campbell <ian.campbell@xxxxxxxxxx>
> > > > Date: Fri, 26 Apr 2013 12:41:43 +0100
> > > > Subject: [PATCH] libxl: stat the path for all non-qdisk backends (including 
> > > > unknown)
> > > >
> > > > The commit a8a1f236a296 "libxl: Only call stat() when adding a disk if we
> > > > expect a device to exist." changed things to only stat the file when the phy
> > > > backend was explicitly requested. This broke the case where we are probing and
> > > > would normally be able to decide on the phy option.
> > > >
> > > > Since the intention of that commit was to allow for backends with no explicit
> > > > file in dom0 (i.e. network remote backend such as ceph) the lowest impact fix
> > > > appears to be to make that explicit. It turns out that tap disk can also
> > > > potentially handle such paths.
> > > >
> > > > The only backend which requires a local file/device is PHY but we need to
> > > > handle UNKNOWN too in order for subsequent probing to work. Note that it is
> > > > not possible to autoprobe the backend if the path is not a local object, so we
> > > > don't need to worry about autoprobing ceph etc.
> > > >
> > > > This should probably be revisited to rationalize the probing.
> > > >
> > > > Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
> > > Acked-by: Roger Pau Monnà <roger.pau@xxxxxxxxxx>
> > This is a fix, right?  Assuming it is:
> >
> > Acked-by: George Dunlap <george.dunlap@xxxxxxxxxxxxx>
> Applied, thanks.
Thanks for fixing my bug :-)

I've just rebuilt everything and qdisk/RBD still works for me.

Cheers,
Dave



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