new statx() like interface for libcephfs

[Jeff Layton]

On Tue, 2016-06-28 at 14:53 -0400, Daniel Gryniewicz wrote:
> Is stx_version a generation ID for the inode that can be used for the
> NFSv4 Change ID?  If so, that would be quite useful to us.  Otherwise,
> I'm not sure there's that much in there that's useful beyond what stat
> already provides, unless I'm missing something.
> 

Yeah, I think that's the idea behind that field in statx calls, but
I'll note that I didn't wire that up here. That is the nice thing about
the proposed statx API though. We can add stuff like that in a
piecemeal fashion, as long as the callers check the stx_mask to make
sure the returned values are legit.

I'll look at whether it's possible to wire that up as well if it's
helpful for ganesha.

> On Tue, Jun 28, 2016 at 2:17 PM, Jeff Layton <jlayton at redhat.com> wrote:
> > 
> > I have a patchset queued up for ceph that adds btime (birthtime)
> > support to it. What was lacking though was a mechanism to get the btime
> > out of the inode.
> > 
> > Rather than cook up a brand new interface just for the btime, I decided
> > to "borrow" the work that David Howells did with the new proposed
> > statx() interface. The pull request to add this to ceph is up here:
> > 
> >      https://github.com/ceph/ceph/pull/9965
> > 
> > Sage has already closed it out which I take to mean that he has pulled
> > the patches into a staging branch for eventual merge.
> > 
> > It occurs to me though that I didn't ask anyone who is working on the
> > samba vfs or ganesha fsal code whether they think this interface is
> > acceptable.
> > 
> > Since Samba and Ganesha are the targeted users of this interface, it'd
> > be good to have developers from both communities take a look and see if
> > there are any problems here.
> > 
> > Does anyone see any issues with the above pull request?
> > --
> > Jeff Layton <jlayton at redhat.com>
> > 
> > --
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-- 
Jeff Layton <jlayton at redhat.com>