Date:   Thu, 6 Jan 2022 09:36:05 -0500
From:   "bfields@fieldses.org" <bfields@fieldses.org>
To:     Ondrej Valousek <ondrej.valousek.xm@renesas.com>
Cc:     Trond Myklebust <trondmy@hammerspace.com>,
        "linux-nfs@vger.kernel.org" <linux-nfs@vger.kernel.org>,
        "anna.schumaker@netapp.com" <anna.schumaker@netapp.com>,
        "trondmy@kernel.org" <trondmy@kernel.org>
Subject: Re: [PATCH 0/8] Support btime and other NFSv4 specific attributes
Message-ID: <20220106143605.GD7105@fieldses.org>
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On Thu, Jan 06, 2022 at 09:28:12AM -0500, bfields@fieldses.org wrote:
> On Thu, Jan 06, 2022 at 02:19:22PM +0000, Ondrej Valousek wrote:
> > > You also need to update the value of NFSD4_SUPPORTED_ATTRS_WORD1 to reflect the new support for FATTR4_WORD1_TIME_CREATE.
> > 
> > Yes, I realized that one shortly after I sent the mail.
> > Just going to try this patch:
> 
> Thanks!
> 
> Don't we want to vary support depending on the filesystem, though?  Is
> there a way to query that?

Poking around a bit...  looks like we need to check stat->result_mask &
STATX_BTIME.  And use that to adjust the value of bmval0 at the top of
encode_fattr, and make the below encoding conditional on it.

?

--b.

> 
> --b.
> 
> > 
> > [ondrejv@skynet19 /opt/kernel/linux-git/fs/nfsd]$ git diff
> > diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
> > index 5a93a5db4fb0..be47e1dd6da5 100644
> > --- a/fs/nfsd/nfs4xdr.c
> > +++ b/fs/nfsd/nfs4xdr.c
> > @@ -3265,6 +3265,14 @@ nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
> >                 p = xdr_encode_hyper(p, (s64)stat.mtime.tv_sec);
> >                 *p++ = cpu_to_be32(stat.mtime.tv_nsec);
> >         }
> > +       /* support for btime here */
> > +        if (bmval1 & FATTR4_WORD1_TIME_CREATE) {
> > +                p = xdr_reserve_space(xdr, 12);
> > +                if (!p)
> > +                        goto out_resource;
> > +                p = xdr_encode_hyper(p, (s64)stat.btime.tv_sec);
> > +                *p++ = cpu_to_be32(stat.btime.tv_nsec);
> > +        }
> >         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
> >                 struct kstat parent_stat;
> >                 u64 ino = stat.ino;
> > diff --git a/fs/nfsd/nfsd.h b/fs/nfsd/nfsd.h
> > index 498e5a489826..5ef056ce7591 100644
> > --- a/fs/nfsd/nfsd.h
> > +++ b/fs/nfsd/nfsd.h
> > @@ -364,7 +364,7 @@ void                nfsd_lockd_shutdown(void);
> >   | FATTR4_WORD1_OWNER          | FATTR4_WORD1_OWNER_GROUP  | FATTR4_WORD1_RAWDEV           \
> >   | FATTR4_WORD1_SPACE_AVAIL     | FATTR4_WORD1_SPACE_FREE   | FATTR4_WORD1_SPACE_TOTAL      \
> >   | FATTR4_WORD1_SPACE_USED      | FATTR4_WORD1_TIME_ACCESS  | FATTR4_WORD1_TIME_ACCESS_SET  \
> > - | FATTR4_WORD1_TIME_DELTA   | FATTR4_WORD1_TIME_METADATA    \
> > + | FATTR4_WORD1_TIME_DELTA   | FATTR4_WORD1_TIME_METADATA   | FATTR4_WORD1_TIME_CREATE      \
> >   | FATTR4_WORD1_TIME_MODIFY     | FATTR4_WORD1_TIME_MODIFY_SET | FATTR4_WORD1_MOUNTED_ON_FILEID)
> > 
> >  #define NFSD4_SUPPORTED_ATTRS_WORD2 0
> > 
> > 
> > ... will see
> > 
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