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

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Hi Jeff,

On Fri, Mar 15, 2024 at 12:54 PM Jeff Layton <jlayton@xxxxxxxxxx> 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@xxxxxxxxxx>
> ---
>  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);
      |         ^


>  /*
>   * 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
>





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