You rather mean bmval1 not bmval0, right?
-----Original Message-----
From: bfields@xxxxxxxxxxxx <bfields@xxxxxxxxxxxx>
Sent: čtvrtek 6. ledna 2022 15:36
To: Ondrej Valousek <ondrej.valousek.xm@xxxxxxxxxxx>
Cc: Trond Myklebust <trondmy@xxxxxxxxxxxxxxx>; linux-nfs@xxxxxxxxxxxxxxx; anna.schumaker@xxxxxxxxxx; trondmy@xxxxxxxxxx
Subject: Re: [PATCH 0/8] Support btime and other NFSv4 specific attributes
On Thu, Jan 06, 2022 at 09:28:12AM -0500, bfields@xxxxxxxxxxxx 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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