Re: [PATCH RFC 21/24] nfs: add a GDD_GETATTR rpc operation

[Jeff Layton <jlayton@kernel.org>]

On Fri, 2024-03-15 at 16:50 -0400, Anna Schumaker wrote:
> Hi Jeff,
> 
> On Fri, Mar 15, 2024 at 12:54 PM Jeff Layton <jlayton@kernel.org> wrote:
> > 
> > Add a new compound that does a GET_DIR_DELEGATION just before doing a
> > GETATTR on an inode. Add a delegation stateid and a nf_status code to
> > struct nfs4_getattr_res to store the result.
> > 
> > Signed-off-by: Jeff Layton <jlayton@kernel.org>
> > ---
> >  fs/nfs/nfs4xdr.c        | 136 ++++++++++++++++++++++++++++++++++++++++++++++++
> >  include/linux/nfs4.h    |   1 +
> >  include/linux/nfs_xdr.h |   2 +
> >  3 files changed, 139 insertions(+)
> > 
> > diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c
> > index 1416099dfcd1..c28025018bda 100644
> > --- a/fs/nfs/nfs4xdr.c
> > +++ b/fs/nfs/nfs4xdr.c
> > @@ -391,6 +391,22 @@ static int decode_layoutget(struct xdr_stream *xdr, struct rpc_rqst *req,
> >                                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + 5)
> >  #define encode_reclaim_complete_maxsz  (op_encode_hdr_maxsz + 4)
> >  #define decode_reclaim_complete_maxsz  (op_decode_hdr_maxsz + 4)
> > +#define encode_get_dir_delegation_maxsz (op_encode_hdr_maxsz +                         \
> > +                                        4 /* gdda_signal_deleg_avail */ +              \
> > +                                        8 /* gdda_notification_types */ +              \
> > +                                        nfstime4_maxsz  /* gdda_child_attr_delay */ +  \
> > +                                        nfstime4_maxsz  /* gdda_dir_attr_delay */ +    \
> > +                                        nfs4_fattr_bitmap_maxsz /* gdda_child_attributes */ + \
> > +                                        nfs4_fattr_bitmap_maxsz /* gdda_dir_attributes */)
> > +
> > +#define decode_get_dir_delegation_maxsz (op_encode_hdr_maxsz +                         \
> > +                                        4 /* gddrnf_status */ +                        \
> > +                                        encode_verifier_maxsz /* gddr_cookieverf */ +  \
> > +                                        encode_stateid_maxsz /* gddr_stateid */ +      \
> > +                                        8 /* gddr_notification */ +                    \
> > +                                        nfs4_fattr_bitmap_maxsz /* gddr_child_attributes */ + \
> > +                                        nfs4_fattr_bitmap_maxsz /* gddr_dir_attributes */)
> > +
> >  #define encode_getdeviceinfo_maxsz (op_encode_hdr_maxsz + \
> >                                 XDR_QUADLEN(NFS4_DEVICEID4_SIZE) + \
> >                                 1 /* layout type */ + \
> > @@ -636,6 +652,18 @@ static int decode_layoutget(struct xdr_stream *xdr, struct rpc_rqst *req,
> >                                 decode_putfh_maxsz + \
> >                                 decode_getattr_maxsz + \
> >                                 decode_renew_maxsz)
> > +#define NFS4_enc_gdd_getattr_sz        (compound_encode_hdr_maxsz + \
> > +                               encode_sequence_maxsz + \
> > +                               encode_putfh_maxsz + \
> > +                               encode_get_dir_delegation_maxsz + \
> > +                               encode_getattr_maxsz + \
> > +                               encode_renew_maxsz)
> > +#define NFS4_dec_gdd_getattr_sz        (compound_decode_hdr_maxsz + \
> > +                               decode_sequence_maxsz + \
> > +                               decode_putfh_maxsz + \
> > +                               decode_get_dir_delegation_maxsz + \
> > +                               decode_getattr_maxsz + \
> > +                               decode_renew_maxsz)
> >  #define NFS4_enc_lookup_sz     (compound_encode_hdr_maxsz + \
> >                                 encode_sequence_maxsz + \
> >                                 encode_putfh_maxsz + \
> > @@ -1981,6 +2009,30 @@ static void encode_sequence(struct xdr_stream *xdr,
> >  }
> > 
> >  #ifdef CONFIG_NFS_V4_1
> > +static void
> > +encode_get_dir_delegation(struct xdr_stream *xdr, struct compound_hdr *hdr)
> > +{
> > +       __be32 *p;
> > +       struct timespec64 ts = {};
> > +       u32 zerobm[1] = {};
> > +
> > +       encode_op_hdr(xdr, OP_GET_DIR_DELEGATION, decode_get_dir_delegation_maxsz, hdr);
> > +
> > +       /* We can't handle CB_RECALLABLE_OBJ_AVAIL yet */
> > +       xdr_stream_encode_bool(xdr, false);
> > +
> > +       /* for now, we request no notification types */
> > +       xdr_encode_bitmap4(xdr, zerobm, ARRAY_SIZE(zerobm));
> > +
> > +       /* Request no attribute updates */
> > +       p = reserve_space(xdr, 12 + 12);
> > +       p = xdr_encode_nfstime4(p, &ts);
> > +       xdr_encode_nfstime4(p, &ts);
> > +
> > +       xdr_encode_bitmap4(xdr, zerobm, ARRAY_SIZE(zerobm));
> > +       xdr_encode_bitmap4(xdr, zerobm, ARRAY_SIZE(zerobm));
> > +}
> > +
> >  static void
> >  encode_getdeviceinfo(struct xdr_stream *xdr,
> >                      const struct nfs4_getdeviceinfo_args *args,
> > @@ -2334,6 +2386,25 @@ static void nfs4_xdr_enc_getattr(struct rpc_rqst *req, struct xdr_stream *xdr,
> >         encode_nops(&hdr);
> >  }
> > 
> > +/*
> > + * Encode GDD_GETATTR request
> > + */
> > +static void nfs4_xdr_enc_gdd_getattr(struct rpc_rqst *req, struct xdr_stream *xdr,
> > +                                    const void *data)
> > +{
> > +       const struct nfs4_getattr_arg *args = data;
> > +       struct compound_hdr hdr = {
> > +               .minorversion = nfs4_xdr_minorversion(&args->seq_args),
> > +       };
> > +
> > +       encode_compound_hdr(xdr, req, &hdr);
> > +       encode_sequence(xdr, &args->seq_args, &hdr);
> > +       encode_putfh(xdr, args->fh, &hdr);
> > +       encode_get_dir_delegation(xdr, &hdr);
> > +       encode_getfattr(xdr, args->bitmask, &hdr);
> > +       encode_nops(&hdr);
> > +}
> > +
> 
> This function should be under a "#ifdef CONFIG_NFS_V4_1" to avoid the
> following compiler error:
> 
> fs/nfs/nfs4xdr.c:2403:2: error: call to undeclared function
> 'encode_get_dir_delegation'; ISO C99 and later do not support implicit
> function declarations [-Wimplicit-function-declaration]
>  2403 |         encode_get_dir_delegation(xdr, &hdr);
>       |         ^
> 

Thanks Anna! I'll fix up both problems before the next iteration.

> 
> >  /*
> >   * Encode a CLOSE request
> >   */
> > @@ -5919,6 +5990,43 @@ static int decode_layout_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
> >         return decode_stateid(xdr, stateid);
> >  }
> > 
> > +static int decode_get_dir_delegation(struct xdr_stream *xdr,
> > +                                    struct nfs4_getattr_res *res)
> > +{
> > +       nfs4_verifier   cookieverf;
> > +       int             status;
> > +       u32             bm[1];
> > +
> > +       status = decode_op_hdr(xdr, OP_GET_DIR_DELEGATION);
> > +       if (status)
> > +               return status;
> > +
> > +       if (xdr_stream_decode_u32(xdr, &res->nf_status))
> > +               return -EIO;
> > +
> > +       if (res->nf_status == GDD4_UNAVAIL)
> > +               return xdr_inline_decode(xdr, 4) ? 0 : -EIO;
> > +
> > +       status = decode_verifier(xdr, &cookieverf);
> > +       if (status)
> > +               return status;
> > +
> > +       status = decode_delegation_stateid(xdr, &res->deleg);
> > +       if (status)
> > +               return status;
> > +
> > +       status = decode_bitmap4(xdr, bm, ARRAY_SIZE(bm));
> > +       if (status < 0)
> > +               return status;
> > +       status = decode_bitmap4(xdr, bm, ARRAY_SIZE(bm));
> > +       if (status < 0)
> > +               return status;
> > +       status = decode_bitmap4(xdr, bm, ARRAY_SIZE(bm));
> > +       if (status < 0)
> > +               return status;
> > +       return 0;
> > +}
> > +
> >  static int decode_getdeviceinfo(struct xdr_stream *xdr,
> >                                 struct nfs4_getdeviceinfo_res *res)
> >  {
> > @@ -6455,6 +6563,33 @@ static int nfs4_xdr_dec_getattr(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
> >         return status;
> >  }
> > 
> > +/*
> > + * Decode GDD_GETATTR response
> > + */
> > +static int nfs4_xdr_dec_gdd_getattr(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
> > +                                   void *data)
> > +{
> > +       struct nfs4_getattr_res *res = data;
> > +       struct compound_hdr hdr;
> > +       int status;
> > +
> > +       status = decode_compound_hdr(xdr, &hdr);
> > +       if (status)
> > +               goto out;
> > +       status = decode_sequence(xdr, &res->seq_res, rqstp);
> > +       if (status)
> > +               goto out;
> > +       status = decode_putfh(xdr);
> > +       if (status)
> > +               goto out;
> > +       status = decode_get_dir_delegation(xdr, res);
> > +       if (status)
> > +               goto out;
> > +       status = decode_getfattr(xdr, res->fattr, res->server);
> > +out:
> > +       return status;
> > +}
> > +
> 
> This needs to be under the same #ifdef, too.
> 
> Thanks,
>  Anna
> 
> >  /*
> >   * Encode an SETACL request
> >   */
> > @@ -7704,6 +7839,7 @@ const struct rpc_procinfo nfs4_procedures[] = {
> >         PROC41(BIND_CONN_TO_SESSION,
> >                         enc_bind_conn_to_session, dec_bind_conn_to_session),
> >         PROC41(DESTROY_CLIENTID,enc_destroy_clientid,   dec_destroy_clientid),
> > +       PROC41(GDD_GETATTR,     enc_gdd_getattr,        dec_gdd_getattr),
> >         PROC42(SEEK,            enc_seek,               dec_seek),
> >         PROC42(ALLOCATE,        enc_allocate,           dec_allocate),
> >         PROC42(DEALLOCATE,      enc_deallocate,         dec_deallocate),
> > diff --git a/include/linux/nfs4.h b/include/linux/nfs4.h
> > index 11ad088b411d..86cbfd50ecd1 100644
> > --- a/include/linux/nfs4.h
> > +++ b/include/linux/nfs4.h
> > @@ -681,6 +681,7 @@ enum {
> >         NFSPROC4_CLNT_LISTXATTRS,
> >         NFSPROC4_CLNT_REMOVEXATTR,
> >         NFSPROC4_CLNT_READ_PLUS,
> > +       NFSPROC4_CLNT_GDD_GETATTR,
> >  };
> > 
> >  /* nfs41 types */
> > diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h
> > index d09b9773b20c..85ee37ccc25e 100644
> > --- a/include/linux/nfs_xdr.h
> > +++ b/include/linux/nfs_xdr.h
> > @@ -1072,6 +1072,8 @@ struct nfs4_getattr_res {
> >         struct nfs4_sequence_res        seq_res;
> >         const struct nfs_server *       server;
> >         struct nfs_fattr *              fattr;
> > +       nfs4_stateid                    deleg;
> > +       u32                             nf_status;
> >  };
> > 
> >  struct nfs4_link_arg {
> > 
> > --
> > 2.44.0
> > 

-- 
Jeff Layton <jlayton@kernel.org>