On Mon, Mar 01, 2021 at 10:15:24AM -0500, Chuck Lever wrote:
> NFSD initializes an encode xdr_stream only after the RPC layer has
> already inserted the RPC Reply header.
Out of curiosity: does it need to be this way?
--b.
> Thus it behaves differently
> than xdr_init_encode does, which assumes the passed-in xdr_buf is
> entirely devoid of content.
>
> nfs4proc.c has this server-side stream initialization helper, but
> it is visible only to the NFSv4 code. Move this helper to a place
> that can be accessed by NFSv2 and NFSv3 server XDR functions.
>
> Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
> ---
> fs/nfsd/nfs4proc.c | 31 +++---------
> fs/nfsd/nfs4state.c | 6 +-
> fs/nfsd/nfs4xdr.c | 110 ++++++++++++++++++++++----------------------
> fs/nfsd/nfssvc.c | 4 +-
> fs/nfsd/xdr4.h | 2 -
> include/linux/sunrpc/svc.h | 25 ++++++++++
> 6 files changed, 94 insertions(+), 84 deletions(-)
>
> diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
> index acdb3cd806a1..b749033e467f 100644
> --- a/fs/nfsd/nfs4proc.c
> +++ b/fs/nfsd/nfs4proc.c
> @@ -2262,25 +2262,6 @@ static bool need_wrongsec_check(struct svc_rqst *rqstp)
> return !(nextd->op_flags & OP_HANDLES_WRONGSEC);
> }
>
> -static void svcxdr_init_encode(struct svc_rqst *rqstp,
> - struct nfsd4_compoundres *resp)
> -{
> - struct xdr_stream *xdr = &resp->xdr;
> - struct xdr_buf *buf = &rqstp->rq_res;
> - struct kvec *head = buf->head;
> -
> - xdr->buf = buf;
> - xdr->iov = head;
> - xdr->p = head->iov_base + head->iov_len;
> - xdr->end = head->iov_base + PAGE_SIZE - rqstp->rq_auth_slack;
> - /* Tail and page_len should be zero at this point: */
> - buf->len = buf->head[0].iov_len;
> - xdr_reset_scratch_buffer(xdr);
> - xdr->page_ptr = buf->pages - 1;
> - buf->buflen = PAGE_SIZE * (1 + rqstp->rq_page_end - buf->pages)
> - - rqstp->rq_auth_slack;
> -}
> -
> #ifdef CONFIG_NFSD_V4_2_INTER_SSC
> static void
> check_if_stalefh_allowed(struct nfsd4_compoundargs *args)
> @@ -2335,10 +2316,14 @@ nfsd4_proc_compound(struct svc_rqst *rqstp)
> struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
> __be32 status;
>
> - svcxdr_init_encode(rqstp, resp);
> - resp->tagp = resp->xdr.p;
> + resp->xdr = &rqstp->rq_res_stream;
> +
> + /* reserve space for: NFS status code */
> + xdr_reserve_space(resp->xdr, XDR_UNIT);
> +
> + resp->tagp = resp->xdr->p;
> /* reserve space for: taglen, tag, and opcnt */
> - xdr_reserve_space(&resp->xdr, 8 + args->taglen);
> + xdr_reserve_space(resp->xdr, XDR_UNIT * 2 + args->taglen);
> resp->taglen = args->taglen;
> resp->tag = args->tag;
> resp->rqstp = rqstp;
> @@ -2444,7 +2429,7 @@ nfsd4_proc_compound(struct svc_rqst *rqstp)
> encode_op:
> if (op->status == nfserr_replay_me) {
> op->replay = &cstate->replay_owner->so_replay;
> - nfsd4_encode_replay(&resp->xdr, op);
> + nfsd4_encode_replay(resp->xdr, op);
> status = op->status = op->replay->rp_status;
> } else {
> nfsd4_encode_operation(resp, op);
> diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
> index 61552e89bd89..83a498ccab19 100644
> --- a/fs/nfsd/nfs4state.c
> +++ b/fs/nfsd/nfs4state.c
> @@ -2903,7 +2903,7 @@ gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se, struct svc_r
> static void
> nfsd4_store_cache_entry(struct nfsd4_compoundres *resp)
> {
> - struct xdr_buf *buf = resp->xdr.buf;
> + struct xdr_buf *buf = resp->xdr->buf;
> struct nfsd4_slot *slot = resp->cstate.slot;
> unsigned int base;
>
> @@ -2973,7 +2973,7 @@ nfsd4_replay_cache_entry(struct nfsd4_compoundres *resp,
> struct nfsd4_sequence *seq)
> {
> struct nfsd4_slot *slot = resp->cstate.slot;
> - struct xdr_stream *xdr = &resp->xdr;
> + struct xdr_stream *xdr = resp->xdr;
> __be32 *p;
> __be32 status;
>
> @@ -3708,7 +3708,7 @@ nfsd4_sequence(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
> {
> struct nfsd4_sequence *seq = &u->sequence;
> struct nfsd4_compoundres *resp = rqstp->rq_resp;
> - struct xdr_stream *xdr = &resp->xdr;
> + struct xdr_stream *xdr = resp->xdr;
> struct nfsd4_session *session;
> struct nfs4_client *clp;
> struct nfsd4_slot *slot;
> diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
> index eaaa1605b5b5..e0f06d3cbd44 100644
> --- a/fs/nfsd/nfs4xdr.c
> +++ b/fs/nfsd/nfs4xdr.c
> @@ -3581,7 +3581,7 @@ nfsd4_encode_stateid(struct xdr_stream *xdr, stateid_t *sid)
> static __be32
> nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
> {
> - struct xdr_stream *xdr = &resp->xdr;
> + struct xdr_stream *xdr = resp->xdr;
> __be32 *p;
>
> p = xdr_reserve_space(xdr, 8);
> @@ -3594,7 +3594,7 @@ nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_
>
> static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
> {
> - struct xdr_stream *xdr = &resp->xdr;
> + struct xdr_stream *xdr = resp->xdr;
> __be32 *p;
>
> p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8);
> @@ -3611,7 +3611,7 @@ static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp,
> static __be32
> nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
> {
> - struct xdr_stream *xdr = &resp->xdr;
> + struct xdr_stream *xdr = resp->xdr;
>
> return nfsd4_encode_stateid(xdr, &close->cl_stateid);
> }
> @@ -3620,7 +3620,7 @@ nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_c
> static __be32
> nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
> {
> - struct xdr_stream *xdr = &resp->xdr;
> + struct xdr_stream *xdr = resp->xdr;
> __be32 *p;
>
> p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
> @@ -3634,7 +3634,7 @@ nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_
> static __be32
> nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
> {
> - struct xdr_stream *xdr = &resp->xdr;
> + struct xdr_stream *xdr = resp->xdr;
> __be32 *p;
>
> p = xdr_reserve_space(xdr, 20);
> @@ -3649,7 +3649,7 @@ static __be32
> nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
> {
> struct svc_fh *fhp = getattr->ga_fhp;
> - struct xdr_stream *xdr = &resp->xdr;
> + struct xdr_stream *xdr = resp->xdr;
>
> return nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry,
> getattr->ga_bmval, resp->rqstp, 0);
> @@ -3658,7 +3658,7 @@ nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4
> static __be32
> nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
> {
> - struct xdr_stream *xdr = &resp->xdr;
> + struct xdr_stream *xdr = resp->xdr;
> struct svc_fh *fhp = *fhpp;
> unsigned int len;
> __be32 *p;
> @@ -3713,7 +3713,7 @@ nfsd4_encode_lock_denied(struct xdr_stream *xdr, struct nfsd4_lock_denied *ld)
> static __be32
> nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
> {
> - struct xdr_stream *xdr = &resp->xdr;
> + struct xdr_stream *xdr = resp->xdr;
>
> if (!nfserr)
> nfserr = nfsd4_encode_stateid(xdr, &lock->lk_resp_stateid);
> @@ -3726,7 +3726,7 @@ nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lo
> static __be32
> nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
> {
> - struct xdr_stream *xdr = &resp->xdr;
> + struct xdr_stream *xdr = resp->xdr;
>
> if (nfserr == nfserr_denied)
> nfsd4_encode_lock_denied(xdr, &lockt->lt_denied);
> @@ -3736,7 +3736,7 @@ nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_l
> static __be32
> nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
> {
> - struct xdr_stream *xdr = &resp->xdr;
> + struct xdr_stream *xdr = resp->xdr;
>
> return nfsd4_encode_stateid(xdr, &locku->lu_stateid);
> }
> @@ -3745,7 +3745,7 @@ nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_l
> static __be32
> nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
> {
> - struct xdr_stream *xdr = &resp->xdr;
> + struct xdr_stream *xdr = resp->xdr;
> __be32 *p;
>
> p = xdr_reserve_space(xdr, 20);
> @@ -3759,7 +3759,7 @@ nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_li
> static __be32
> nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
> {
> - struct xdr_stream *xdr = &resp->xdr;
> + struct xdr_stream *xdr = resp->xdr;
> __be32 *p;
>
> nfserr = nfsd4_encode_stateid(xdr, &open->op_stateid);
> @@ -3853,7 +3853,7 @@ nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_op
> static __be32
> nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
> {
> - struct xdr_stream *xdr = &resp->xdr;
> + struct xdr_stream *xdr = resp->xdr;
>
> return nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid);
> }
> @@ -3861,7 +3861,7 @@ nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct
> static __be32
> nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
> {
> - struct xdr_stream *xdr = &resp->xdr;
> + struct xdr_stream *xdr = resp->xdr;
>
> return nfsd4_encode_stateid(xdr, &od->od_stateid);
> }
> @@ -3871,7 +3871,7 @@ static __be32 nfsd4_encode_splice_read(
> struct nfsd4_read *read,
> struct file *file, unsigned long maxcount)
> {
> - struct xdr_stream *xdr = &resp->xdr;
> + struct xdr_stream *xdr = resp->xdr;
> struct xdr_buf *buf = xdr->buf;
> int status, space_left;
> u32 eof;
> @@ -3937,7 +3937,7 @@ static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp,
> struct nfsd4_read *read,
> struct file *file, unsigned long maxcount)
> {
> - struct xdr_stream *xdr = &resp->xdr;
> + struct xdr_stream *xdr = resp->xdr;
> u32 eof;
> int starting_len = xdr->buf->len - 8;
> __be32 nfserr;
> @@ -3976,7 +3976,7 @@ nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
> struct nfsd4_read *read)
> {
> unsigned long maxcount;
> - struct xdr_stream *xdr = &resp->xdr;
> + struct xdr_stream *xdr = resp->xdr;
> struct file *file;
> int starting_len = xdr->buf->len;
> __be32 *p;
> @@ -3990,7 +3990,7 @@ nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
> WARN_ON_ONCE(test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags));
> return nfserr_resource;
> }
> - if (resp->xdr.buf->page_len &&
> + if (resp->xdr->buf->page_len &&
> test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags)) {
> WARN_ON_ONCE(1);
> return nfserr_resource;
> @@ -4020,7 +4020,7 @@ nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd
> int maxcount;
> __be32 wire_count;
> int zero = 0;
> - struct xdr_stream *xdr = &resp->xdr;
> + struct xdr_stream *xdr = resp->xdr;
> int length_offset = xdr->buf->len;
> int status;
> __be32 *p;
> @@ -4072,7 +4072,7 @@ nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4
> int bytes_left;
> loff_t offset;
> __be64 wire_offset;
> - struct xdr_stream *xdr = &resp->xdr;
> + struct xdr_stream *xdr = resp->xdr;
> int starting_len = xdr->buf->len;
> __be32 *p;
>
> @@ -4083,8 +4083,8 @@ nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4
> /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
> *p++ = cpu_to_be32(0);
> *p++ = cpu_to_be32(0);
> - resp->xdr.buf->head[0].iov_len = ((char *)resp->xdr.p)
> - - (char *)resp->xdr.buf->head[0].iov_base;
> + xdr->buf->head[0].iov_len = (char *)xdr->p -
> + (char *)xdr->buf->head[0].iov_base;
>
> /*
> * Number of bytes left for directory entries allowing for the
> @@ -4159,7 +4159,7 @@ nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4
> static __be32
> nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
> {
> - struct xdr_stream *xdr = &resp->xdr;
> + struct xdr_stream *xdr = resp->xdr;
> __be32 *p;
>
> p = xdr_reserve_space(xdr, 20);
> @@ -4172,7 +4172,7 @@ nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_
> static __be32
> nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
> {
> - struct xdr_stream *xdr = &resp->xdr;
> + struct xdr_stream *xdr = resp->xdr;
> __be32 *p;
>
> p = xdr_reserve_space(xdr, 40);
> @@ -4255,7 +4255,7 @@ static __be32
> nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
> struct nfsd4_secinfo *secinfo)
> {
> - struct xdr_stream *xdr = &resp->xdr;
> + struct xdr_stream *xdr = resp->xdr;
>
> return nfsd4_do_encode_secinfo(xdr, secinfo->si_exp);
> }
> @@ -4264,7 +4264,7 @@ static __be32
> nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
> struct nfsd4_secinfo_no_name *secinfo)
> {
> - struct xdr_stream *xdr = &resp->xdr;
> + struct xdr_stream *xdr = resp->xdr;
>
> return nfsd4_do_encode_secinfo(xdr, secinfo->sin_exp);
> }
> @@ -4276,7 +4276,7 @@ nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
> static __be32
> nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
> {
> - struct xdr_stream *xdr = &resp->xdr;
> + struct xdr_stream *xdr = resp->xdr;
> __be32 *p;
>
> p = xdr_reserve_space(xdr, 16);
> @@ -4300,7 +4300,7 @@ nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4
> static __be32
> nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
> {
> - struct xdr_stream *xdr = &resp->xdr;
> + struct xdr_stream *xdr = resp->xdr;
> __be32 *p;
>
> if (!nfserr) {
> @@ -4324,7 +4324,7 @@ nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct n
> static __be32
> nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
> {
> - struct xdr_stream *xdr = &resp->xdr;
> + struct xdr_stream *xdr = resp->xdr;
> __be32 *p;
>
> p = xdr_reserve_space(xdr, 16);
> @@ -4341,7 +4341,7 @@ static __be32
> nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
> struct nfsd4_exchange_id *exid)
> {
> - struct xdr_stream *xdr = &resp->xdr;
> + struct xdr_stream *xdr = resp->xdr;
> __be32 *p;
> char *major_id;
> char *server_scope;
> @@ -4419,7 +4419,7 @@ static __be32
> nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
> struct nfsd4_create_session *sess)
> {
> - struct xdr_stream *xdr = &resp->xdr;
> + struct xdr_stream *xdr = resp->xdr;
> __be32 *p;
>
> p = xdr_reserve_space(xdr, 24);
> @@ -4472,7 +4472,7 @@ static __be32
> nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
> struct nfsd4_sequence *seq)
> {
> - struct xdr_stream *xdr = &resp->xdr;
> + struct xdr_stream *xdr = resp->xdr;
> __be32 *p;
>
> p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 20);
> @@ -4495,7 +4495,7 @@ static __be32
> nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
> struct nfsd4_test_stateid *test_stateid)
> {
> - struct xdr_stream *xdr = &resp->xdr;
> + struct xdr_stream *xdr = resp->xdr;
> struct nfsd4_test_stateid_id *stateid, *next;
> __be32 *p;
>
> @@ -4516,7 +4516,7 @@ static __be32
> nfsd4_encode_getdeviceinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
> struct nfsd4_getdeviceinfo *gdev)
> {
> - struct xdr_stream *xdr = &resp->xdr;
> + struct xdr_stream *xdr = resp->xdr;
> const struct nfsd4_layout_ops *ops;
> u32 starting_len = xdr->buf->len, needed_len;
> __be32 *p;
> @@ -4572,7 +4572,7 @@ static __be32
> nfsd4_encode_layoutget(struct nfsd4_compoundres *resp, __be32 nfserr,
> struct nfsd4_layoutget *lgp)
> {
> - struct xdr_stream *xdr = &resp->xdr;
> + struct xdr_stream *xdr = resp->xdr;
> const struct nfsd4_layout_ops *ops;
> __be32 *p;
>
> @@ -4599,7 +4599,7 @@ static __be32
> nfsd4_encode_layoutcommit(struct nfsd4_compoundres *resp, __be32 nfserr,
> struct nfsd4_layoutcommit *lcp)
> {
> - struct xdr_stream *xdr = &resp->xdr;
> + struct xdr_stream *xdr = resp->xdr;
> __be32 *p;
>
> p = xdr_reserve_space(xdr, 4);
> @@ -4620,7 +4620,7 @@ static __be32
> nfsd4_encode_layoutreturn(struct nfsd4_compoundres *resp, __be32 nfserr,
> struct nfsd4_layoutreturn *lrp)
> {
> - struct xdr_stream *xdr = &resp->xdr;
> + struct xdr_stream *xdr = resp->xdr;
> __be32 *p;
>
> p = xdr_reserve_space(xdr, 4);
> @@ -4638,7 +4638,7 @@ nfsd42_encode_write_res(struct nfsd4_compoundres *resp,
> struct nfsd42_write_res *write, bool sync)
> {
> __be32 *p;
> - p = xdr_reserve_space(&resp->xdr, 4);
> + p = xdr_reserve_space(resp->xdr, 4);
> if (!p)
> return nfserr_resource;
>
> @@ -4647,11 +4647,11 @@ nfsd42_encode_write_res(struct nfsd4_compoundres *resp,
> else {
> __be32 nfserr;
> *p++ = cpu_to_be32(1);
> - nfserr = nfsd4_encode_stateid(&resp->xdr, &write->cb_stateid);
> + nfserr = nfsd4_encode_stateid(resp->xdr, &write->cb_stateid);
> if (nfserr)
> return nfserr;
> }
> - p = xdr_reserve_space(&resp->xdr, 8 + 4 + NFS4_VERIFIER_SIZE);
> + p = xdr_reserve_space(resp->xdr, 8 + 4 + NFS4_VERIFIER_SIZE);
> if (!p)
> return nfserr_resource;
>
> @@ -4665,7 +4665,7 @@ nfsd42_encode_write_res(struct nfsd4_compoundres *resp,
> static __be32
> nfsd42_encode_nl4_server(struct nfsd4_compoundres *resp, struct nl4_server *ns)
> {
> - struct xdr_stream *xdr = &resp->xdr;
> + struct xdr_stream *xdr = resp->xdr;
> struct nfs42_netaddr *addr;
> __be32 *p;
>
> @@ -4713,7 +4713,7 @@ nfsd4_encode_copy(struct nfsd4_compoundres *resp, __be32 nfserr,
> if (nfserr)
> return nfserr;
>
> - p = xdr_reserve_space(&resp->xdr, 4 + 4);
> + p = xdr_reserve_space(resp->xdr, 4 + 4);
> *p++ = xdr_one; /* cr_consecutive */
> *p++ = cpu_to_be32(copy->cp_synchronous);
> return 0;
> @@ -4723,7 +4723,7 @@ static __be32
> nfsd4_encode_offload_status(struct nfsd4_compoundres *resp, __be32 nfserr,
> struct nfsd4_offload_status *os)
> {
> - struct xdr_stream *xdr = &resp->xdr;
> + struct xdr_stream *xdr = resp->xdr;
> __be32 *p;
>
> p = xdr_reserve_space(xdr, 8 + 4);
> @@ -4740,7 +4740,7 @@ nfsd4_encode_read_plus_data(struct nfsd4_compoundres *resp,
> unsigned long *maxcount, u32 *eof,
> loff_t *pos)
> {
> - struct xdr_stream *xdr = &resp->xdr;
> + struct xdr_stream *xdr = resp->xdr;
> struct file *file = read->rd_nf->nf_file;
> int starting_len = xdr->buf->len;
> loff_t hole_pos;
> @@ -4799,7 +4799,7 @@ nfsd4_encode_read_plus_hole(struct nfsd4_compoundres *resp,
> count = data_pos - read->rd_offset;
>
> /* Content type, offset, byte count */
> - p = xdr_reserve_space(&resp->xdr, 4 + 8 + 8);
> + p = xdr_reserve_space(resp->xdr, 4 + 8 + 8);
> if (!p)
> return nfserr_resource;
>
> @@ -4817,7 +4817,7 @@ nfsd4_encode_read_plus(struct nfsd4_compoundres *resp, __be32 nfserr,
> struct nfsd4_read *read)
> {
> unsigned long maxcount, count;
> - struct xdr_stream *xdr = &resp->xdr;
> + struct xdr_stream *xdr = resp->xdr;
> struct file *file;
> int starting_len = xdr->buf->len;
> int last_segment = xdr->buf->len;
> @@ -4888,7 +4888,7 @@ static __be32
> nfsd4_encode_copy_notify(struct nfsd4_compoundres *resp, __be32 nfserr,
> struct nfsd4_copy_notify *cn)
> {
> - struct xdr_stream *xdr = &resp->xdr;
> + struct xdr_stream *xdr = resp->xdr;
> __be32 *p;
>
> if (nfserr)
> @@ -4924,7 +4924,7 @@ nfsd4_encode_seek(struct nfsd4_compoundres *resp, __be32 nfserr,
> {
> __be32 *p;
>
> - p = xdr_reserve_space(&resp->xdr, 4 + 8);
> + p = xdr_reserve_space(resp->xdr, 4 + 8);
> *p++ = cpu_to_be32(seek->seek_eof);
> p = xdr_encode_hyper(p, seek->seek_pos);
>
> @@ -4985,7 +4985,7 @@ static __be32
> nfsd4_encode_getxattr(struct nfsd4_compoundres *resp, __be32 nfserr,
> struct nfsd4_getxattr *getxattr)
> {
> - struct xdr_stream *xdr = &resp->xdr;
> + struct xdr_stream *xdr = resp->xdr;
> __be32 *p, err;
>
> p = xdr_reserve_space(xdr, 4);
> @@ -5009,7 +5009,7 @@ static __be32
> nfsd4_encode_setxattr(struct nfsd4_compoundres *resp, __be32 nfserr,
> struct nfsd4_setxattr *setxattr)
> {
> - struct xdr_stream *xdr = &resp->xdr;
> + struct xdr_stream *xdr = resp->xdr;
> __be32 *p;
>
> p = xdr_reserve_space(xdr, 20);
> @@ -5050,7 +5050,7 @@ static __be32
> nfsd4_encode_listxattrs(struct nfsd4_compoundres *resp, __be32 nfserr,
> struct nfsd4_listxattrs *listxattrs)
> {
> - struct xdr_stream *xdr = &resp->xdr;
> + struct xdr_stream *xdr = resp->xdr;
> u32 cookie_offset, count_offset, eof;
> u32 left, xdrleft, slen, count;
> u32 xdrlen, offset;
> @@ -5161,7 +5161,7 @@ static __be32
> nfsd4_encode_removexattr(struct nfsd4_compoundres *resp, __be32 nfserr,
> struct nfsd4_removexattr *removexattr)
> {
> - struct xdr_stream *xdr = &resp->xdr;
> + struct xdr_stream *xdr = resp->xdr;
> __be32 *p;
>
> p = xdr_reserve_space(xdr, 20);
> @@ -5301,7 +5301,7 @@ __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize)
> void
> nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
> {
> - struct xdr_stream *xdr = &resp->xdr;
> + struct xdr_stream *xdr = resp->xdr;
> struct nfs4_stateowner *so = resp->cstate.replay_owner;
> struct svc_rqst *rqstp = resp->rqstp;
> const struct nfsd4_operation *opdesc = op->opdesc;
> @@ -5430,14 +5430,14 @@ int
> nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p)
> {
> struct nfsd4_compoundres *resp = rqstp->rq_resp;
> - struct xdr_buf *buf = resp->xdr.buf;
> + struct xdr_buf *buf = resp->xdr->buf;
>
> WARN_ON_ONCE(buf->len != buf->head[0].iov_len + buf->page_len +
> buf->tail[0].iov_len);
>
> *p = resp->cstate.status;
>
> - rqstp->rq_next_page = resp->xdr.page_ptr + 1;
> + rqstp->rq_next_page = resp->xdr->page_ptr + 1;
>
> p = resp->tagp;
> *p++ = htonl(resp->taglen);
> diff --git a/fs/nfsd/nfssvc.c b/fs/nfsd/nfssvc.c
> index 6de406322106..d909e4956244 100644
> --- a/fs/nfsd/nfssvc.c
> +++ b/fs/nfsd/nfssvc.c
> @@ -997,7 +997,7 @@ int nfsd_dispatch(struct svc_rqst *rqstp, __be32 *statp)
> * NFSv4 does some encoding while processing
> */
> p = resv->iov_base + resv->iov_len;
> - resv->iov_len += sizeof(__be32);
> + svcxdr_init_encode(rqstp);
>
> *statp = proc->pc_func(rqstp);
> if (*statp == rpc_drop_reply || test_bit(RQ_DROPME, &rqstp->rq_flags))
> @@ -1052,7 +1052,7 @@ int nfssvc_decode_voidarg(struct svc_rqst *rqstp, __be32 *p)
> */
> int nfssvc_encode_voidres(struct svc_rqst *rqstp, __be32 *p)
> {
> - return xdr_ressize_check(rqstp, p);
> + return 1;
> }
>
> int nfsd_pool_stats_open(struct inode *inode, struct file *file)
> diff --git a/fs/nfsd/xdr4.h b/fs/nfsd/xdr4.h
> index c300885ae75d..fe540a3415c6 100644
> --- a/fs/nfsd/xdr4.h
> +++ b/fs/nfsd/xdr4.h
> @@ -698,7 +698,7 @@ struct nfsd4_compoundargs {
>
> struct nfsd4_compoundres {
> /* scratch variables for XDR encode */
> - struct xdr_stream xdr;
> + struct xdr_stream *xdr;
> struct svc_rqst * rqstp;
>
> u32 taglen;
> diff --git a/include/linux/sunrpc/svc.h b/include/linux/sunrpc/svc.h
> index 31ee3b6047c3..e91d51ea028b 100644
> --- a/include/linux/sunrpc/svc.h
> +++ b/include/linux/sunrpc/svc.h
> @@ -248,6 +248,7 @@ struct svc_rqst {
> size_t rq_xprt_hlen; /* xprt header len */
> struct xdr_buf rq_arg;
> struct xdr_stream rq_arg_stream;
> + struct xdr_stream rq_res_stream;
> struct page *rq_scratch_page;
> struct xdr_buf rq_res;
> struct page *rq_pages[RPCSVC_MAXPAGES + 1];
> @@ -574,4 +575,28 @@ static inline void svcxdr_init_decode(struct svc_rqst *rqstp)
> xdr_set_scratch_page(xdr, rqstp->rq_scratch_page);
> }
>
> +/**
> + * svcxdr_init_encode - Prepare an xdr_stream for svc Reply encoding
> + * @rqstp: controlling server RPC transaction context
> + *
> + */
> +static inline void svcxdr_init_encode(struct svc_rqst *rqstp)
> +{
> + struct xdr_stream *xdr = &rqstp->rq_res_stream;
> + struct xdr_buf *buf = &rqstp->rq_res;
> + struct kvec *resv = buf->head;
> +
> + xdr_reset_scratch_buffer(xdr);
> +
> + xdr->buf = buf;
> + xdr->iov = resv;
> + xdr->p = resv->iov_base + resv->iov_len;
> + xdr->end = resv->iov_base + PAGE_SIZE - rqstp->rq_auth_slack;
> + buf->len = resv->iov_len;
> + xdr->page_ptr = buf->pages - 1;
> + buf->buflen = PAGE_SIZE * (1 + rqstp->rq_page_end - buf->pages);
> + buf->buflen -= rqstp->rq_auth_slack;
> + xdr->rqst = NULL;
> +}
> +
> #endif /* SUNRPC_SVC_H */
>
