Re: [PATCH] ndctl: Use max_available_extent for creating namespaces

["Verma, Vishal L" <vishal.l.verma@intel.com>]

On Tue, 2018-06-26 at 10:29 -0600, Keith Busch wrote:
> On Tue, Jun 26, 2018 at 09:19:28AM -0700, Verma, Vishal L wrote:
> > On Tue, 2018-06-26 at 09:37 -0600, Keith Busch wrote:
> > > The available_size attribute returns all the unused regions, but a
> > > namespace has to use contiguous free regions. This patch uses the
> > > attribute returning the largest capacity that can be created for
> > > determining if the namespace can be created.
> > > 
> > > Signed-off-by: Keith Busch <keith.busch@intel.com>
> > > ---
> > >  ndctl/lib/libndctl.c   | 30 ++++++++++++++++++++++++++++++
> > >  ndctl/lib/libndctl.sym |  1 +
> > >  ndctl/libndctl.h       |  2 ++
> > >  ndctl/namespace.c      |  2 +-
> > >  4 files changed, 34 insertions(+), 1 deletion(-)
> > 
> > Hi Keith,
> > 
> > The patch looks good, but just a couple of 'meta' comments.
> > 1. We typically send ndctl patches separately from kernel patches (i.e.
> > not
> > thraded together).
> > 2. for ndctl patches, an 'ndctl PATCH' prefix is recommended. You can
> > set a
> > repo local config parameter for doing this automatically on git format-
> > patch.
> > 	git config format.subjectprefix "ndctl PATCH"
> > 
> > I'm thinking the kernel changes will be queued for 4.19, which means
> > the
> > ndctl changes will go into v62.
> 
> Thanks for the info. I'll make those changes for next time.
> 
> I think I may need to send a v2 for this. Should we have this fall back
> to
> the available_size for the older kernels where the max_available_extents
> attribute is not provided? I actually had that in my repo and used a
> slightly older patch here, but I'm not sure if its okay to strongly
> couple an ndctl release to a kernel version.

I was thinking that too. Typically we don't guarantee ndctl to work with
old kernels, but this does seem like a bit of an invasive change.

Dan, thoughts?
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