Re: [PATCH 0/8] Support btime and other NFSv4 specific attributes

["bfields@fieldses.org" <bfields@fieldses.org>]

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?

--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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