fs/nfs/nfs42xdr.c - third_party/linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (c) 2014 Anna Schumaker <Anna.Schumaker@Netapp.com>
  */
 #ifndef __LINUX_FS_NFS_NFS4_2XDR_H
 #define __LINUX_FS_NFS_NFS4_2XDR_H

 #include "nfs42.h"

 #define encode_fallocate_maxsz		(encode_stateid_maxsz + \
 					 2 /* offset */ + \
 					 2 /* length */)
 #define NFS42_WRITE_RES_SIZE		(1 /* wr_callback_id size */ +\
 					 XDR_QUADLEN(NFS4_STATEID_SIZE) + \
 					 2 /* wr_count */ + \
 					 1 /* wr_committed */ + \
 					 XDR_QUADLEN(NFS4_VERIFIER_SIZE))
 #define encode_allocate_maxsz		(op_encode_hdr_maxsz + \
 					 encode_fallocate_maxsz)
 #define decode_allocate_maxsz		(op_decode_hdr_maxsz)
 #define encode_copy_maxsz		(op_encode_hdr_maxsz +          \
 					 XDR_QUADLEN(NFS4_STATEID_SIZE) + \
 					 XDR_QUADLEN(NFS4_STATEID_SIZE) + \
 					 2 + 2 + 2 + 1 + 1 + 1)
 #define decode_copy_maxsz		(op_decode_hdr_maxsz + \
 					 NFS42_WRITE_RES_SIZE + \
 					 1 /* cr_consecutive */ + \
 					 1 /* cr_synchronous */)
 #define encode_offload_cancel_maxsz	(op_encode_hdr_maxsz + \
 					 XDR_QUADLEN(NFS4_STATEID_SIZE))
 #define decode_offload_cancel_maxsz	(op_decode_hdr_maxsz)
 #define encode_deallocate_maxsz		(op_encode_hdr_maxsz + \
 					 encode_fallocate_maxsz)
 #define decode_deallocate_maxsz		(op_decode_hdr_maxsz)
 #define encode_seek_maxsz		(op_encode_hdr_maxsz + \
 					 encode_stateid_maxsz + \
 					 2 /* offset */ + \
 					 1 /* whence */)
 #define decode_seek_maxsz		(op_decode_hdr_maxsz + \
 					 1 /* eof */ + \
 					 1 /* whence */ + \
 					 2 /* offset */ + \
 					 2 /* length */)
 #define encode_io_info_maxsz		4
 #define encode_layoutstats_maxsz	(op_decode_hdr_maxsz + \
 					2 /* offset */ + \
 					2 /* length */ + \
 					encode_stateid_maxsz + \
 					encode_io_info_maxsz + \
 					encode_io_info_maxsz + \
 					1 /* opaque devaddr4 length */ + \
 					XDR_QUADLEN(PNFS_LAYOUTSTATS_MAXSIZE))
 #define decode_layoutstats_maxsz	(op_decode_hdr_maxsz)
 #define encode_device_error_maxsz	(XDR_QUADLEN(NFS4_DEVICEID4_SIZE) + \
 					1 /* status */ + 1 /* opnum */)
 #define encode_layouterror_maxsz	(op_decode_hdr_maxsz + \
 					2 /* offset */ + \
 					2 /* length */ + \
 					encode_stateid_maxsz + \
 					1 /* Array size */ + \
 					encode_device_error_maxsz)
 #define decode_layouterror_maxsz	(op_decode_hdr_maxsz)
 #define encode_clone_maxsz		(encode_stateid_maxsz + \
 					encode_stateid_maxsz + \
 					2 /* src offset */ + \
 					2 /* dst offset */ + \
 					2 /* count */)
 #define decode_clone_maxsz		(op_decode_hdr_maxsz)

 #define NFS4_enc_allocate_sz		(compound_encode_hdr_maxsz + \
 					 encode_sequence_maxsz + \
 					 encode_putfh_maxsz + \
 					 encode_allocate_maxsz + \
 					 encode_getattr_maxsz)
 #define NFS4_dec_allocate_sz		(compound_decode_hdr_maxsz + \
 					 decode_sequence_maxsz + \
 					 decode_putfh_maxsz + \
 					 decode_allocate_maxsz + \
 					 decode_getattr_maxsz)
 #define NFS4_enc_copy_sz		(compound_encode_hdr_maxsz + \
 					 encode_sequence_maxsz + \
 					 encode_putfh_maxsz + \
 					 encode_savefh_maxsz + \
 					 encode_putfh_maxsz + \
 					 encode_copy_maxsz + \
 					 encode_commit_maxsz)
 #define NFS4_dec_copy_sz		(compound_decode_hdr_maxsz + \
 					 decode_sequence_maxsz + \
 					 decode_putfh_maxsz + \
 					 decode_savefh_maxsz + \
 					 decode_putfh_maxsz + \
 					 decode_copy_maxsz + \
 					 decode_commit_maxsz)
 #define NFS4_enc_offload_cancel_sz	(compound_encode_hdr_maxsz + \
 					 encode_sequence_maxsz + \
 					 encode_putfh_maxsz + \
 					 encode_offload_cancel_maxsz)
 #define NFS4_dec_offload_cancel_sz	(compound_decode_hdr_maxsz + \
 					 decode_sequence_maxsz + \
 					 decode_putfh_maxsz + \
 					 decode_offload_cancel_maxsz)
 #define NFS4_enc_deallocate_sz		(compound_encode_hdr_maxsz + \
 					 encode_sequence_maxsz + \
 					 encode_putfh_maxsz + \
 					 encode_deallocate_maxsz + \
 					 encode_getattr_maxsz)
 #define NFS4_dec_deallocate_sz		(compound_decode_hdr_maxsz + \
 					 decode_sequence_maxsz + \
 					 decode_putfh_maxsz + \
 					 decode_deallocate_maxsz + \
 					 decode_getattr_maxsz)
 #define NFS4_enc_seek_sz		(compound_encode_hdr_maxsz + \
 					 encode_sequence_maxsz + \
 					 encode_putfh_maxsz + \
 					 encode_seek_maxsz)
 #define NFS4_dec_seek_sz		(compound_decode_hdr_maxsz + \
 					 decode_sequence_maxsz + \
 					 decode_putfh_maxsz + \
 					 decode_seek_maxsz)
 #define NFS4_enc_layoutstats_sz		(compound_encode_hdr_maxsz + \
 					 encode_sequence_maxsz + \
 					 encode_putfh_maxsz + \
 					 PNFS_LAYOUTSTATS_MAXDEV * encode_layoutstats_maxsz)
 #define NFS4_dec_layoutstats_sz		(compound_decode_hdr_maxsz + \
 					 decode_sequence_maxsz + \
 					 decode_putfh_maxsz + \
 					 PNFS_LAYOUTSTATS_MAXDEV * decode_layoutstats_maxsz)
 #define NFS4_enc_layouterror_sz		(compound_encode_hdr_maxsz + \
 					 encode_sequence_maxsz + \
 					 encode_putfh_maxsz + \
 					 NFS42_LAYOUTERROR_MAX * \
 					 encode_layouterror_maxsz)
 #define NFS4_dec_layouterror_sz		(compound_decode_hdr_maxsz + \
 					 decode_sequence_maxsz + \
 					 decode_putfh_maxsz + \
 					 NFS42_LAYOUTERROR_MAX * \
 					 decode_layouterror_maxsz)
 #define NFS4_enc_clone_sz		(compound_encode_hdr_maxsz + \
 					 encode_sequence_maxsz + \
 					 encode_putfh_maxsz + \
 					 encode_savefh_maxsz + \
 					 encode_putfh_maxsz + \
 					 encode_clone_maxsz + \
 					 encode_getattr_maxsz)
 #define NFS4_dec_clone_sz		(compound_decode_hdr_maxsz + \
 					 decode_sequence_maxsz + \
 					 decode_putfh_maxsz + \
 					 decode_savefh_maxsz + \
 					 decode_putfh_maxsz + \
 					 decode_clone_maxsz + \
 					 decode_getattr_maxsz)

 static void encode_fallocate(struct xdr_stream *xdr,
 			     const struct nfs42_falloc_args *args)
 {
 	encode_nfs4_stateid(xdr, &args->falloc_stateid);
 	encode_uint64(xdr, args->falloc_offset);
 	encode_uint64(xdr, args->falloc_length);
 }

 static void encode_allocate(struct xdr_stream *xdr,
 			    const struct nfs42_falloc_args *args,
 			    struct compound_hdr *hdr)
 {
 	encode_op_hdr(xdr, OP_ALLOCATE, decode_allocate_maxsz, hdr);
 	encode_fallocate(xdr, args);
 }

 static void encode_copy(struct xdr_stream *xdr,
 			const struct nfs42_copy_args *args,
 			struct compound_hdr *hdr)
 {
 	encode_op_hdr(xdr, OP_COPY, decode_copy_maxsz, hdr);
 	encode_nfs4_stateid(xdr, &args->src_stateid);
 	encode_nfs4_stateid(xdr, &args->dst_stateid);

 	encode_uint64(xdr, args->src_pos);
 	encode_uint64(xdr, args->dst_pos);
 	encode_uint64(xdr, args->count);

 	encode_uint32(xdr, 1); /* consecutive = true */
 	encode_uint32(xdr, args->sync);
 	encode_uint32(xdr, 0); /* src server list */
 }

 static void encode_offload_cancel(struct xdr_stream *xdr,
 				  const struct nfs42_offload_status_args *args,
 				  struct compound_hdr *hdr)
 {
 	encode_op_hdr(xdr, OP_OFFLOAD_CANCEL, decode_offload_cancel_maxsz, hdr);
 	encode_nfs4_stateid(xdr, &args->osa_stateid);
 }

 static void encode_deallocate(struct xdr_stream *xdr,
 			      const struct nfs42_falloc_args *args,
 			      struct compound_hdr *hdr)
 {
 	encode_op_hdr(xdr, OP_DEALLOCATE, decode_deallocate_maxsz, hdr);
 	encode_fallocate(xdr, args);
 }

 static void encode_seek(struct xdr_stream *xdr,
 			const struct nfs42_seek_args *args,
 			struct compound_hdr *hdr)
 {
 	encode_op_hdr(xdr, OP_SEEK, decode_seek_maxsz, hdr);
 	encode_nfs4_stateid(xdr, &args->sa_stateid);
 	encode_uint64(xdr, args->sa_offset);
 	encode_uint32(xdr, args->sa_what);
 }

 static void encode_layoutstats(struct xdr_stream *xdr,
 			       const struct nfs42_layoutstat_args *args,
 			       struct nfs42_layoutstat_devinfo *devinfo,
 			       struct compound_hdr *hdr)
 {
 	__be32 *p;

 	encode_op_hdr(xdr, OP_LAYOUTSTATS, decode_layoutstats_maxsz, hdr);
 	p = reserve_space(xdr, 8 + 8);
 	p = xdr_encode_hyper(p, devinfo->offset);
 	p = xdr_encode_hyper(p, devinfo->length);
 	encode_nfs4_stateid(xdr, &args->stateid);
 	p = reserve_space(xdr, 4*8 + NFS4_DEVICEID4_SIZE + 4);
 	p = xdr_encode_hyper(p, devinfo->read_count);
 	p = xdr_encode_hyper(p, devinfo->read_bytes);
 	p = xdr_encode_hyper(p, devinfo->write_count);
 	p = xdr_encode_hyper(p, devinfo->write_bytes);
 	p = xdr_encode_opaque_fixed(p, devinfo->dev_id.data,
 			NFS4_DEVICEID4_SIZE);
 	/* Encode layoutupdate4 */
 	*p++ = cpu_to_be32(devinfo->layout_type);
 	if (devinfo->ld_private.ops)
 		devinfo->ld_private.ops->encode(xdr, args,
 				&devinfo->ld_private);
 	else
 		encode_uint32(xdr, 0);
 }

 static void encode_clone(struct xdr_stream *xdr,
 			 const struct nfs42_clone_args *args,
 			 struct compound_hdr *hdr)
 {
 	__be32 *p;

 	encode_op_hdr(xdr, OP_CLONE, decode_clone_maxsz, hdr);
 	encode_nfs4_stateid(xdr, &args->src_stateid);
 	encode_nfs4_stateid(xdr, &args->dst_stateid);
 	p = reserve_space(xdr, 3*8);
 	p = xdr_encode_hyper(p, args->src_offset);
 	p = xdr_encode_hyper(p, args->dst_offset);
 	xdr_encode_hyper(p, args->count);
 }

 static void encode_device_error(struct xdr_stream *xdr,
 				const struct nfs42_device_error *error)
 {
 	__be32 *p;

 	p = reserve_space(xdr, NFS4_DEVICEID4_SIZE + 2*4);
 	p = xdr_encode_opaque_fixed(p, error->dev_id.data,
 			NFS4_DEVICEID4_SIZE);
 	*p++ = cpu_to_be32(error->status);
 	*p = cpu_to_be32(error->opnum);
 }

 static void encode_layouterror(struct xdr_stream *xdr,
 			       const struct nfs42_layout_error *args,
 			       struct compound_hdr *hdr)
 {
 	__be32 *p;

 	encode_op_hdr(xdr, OP_LAYOUTERROR, decode_layouterror_maxsz, hdr);
 	p = reserve_space(xdr, 8 + 8);
 	p = xdr_encode_hyper(p, args->offset);
 	p = xdr_encode_hyper(p, args->length);
 	encode_nfs4_stateid(xdr, &args->stateid);
 	p = reserve_space(xdr, 4);
 	*p = cpu_to_be32(1);
 	encode_device_error(xdr, &args->errors[0]);
 }

 /*
  * Encode ALLOCATE request
  */
 static void nfs4_xdr_enc_allocate(struct rpc_rqst *req,
 				  struct xdr_stream *xdr,
 				  const void *data)
 {
 	const struct nfs42_falloc_args *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->falloc_fh, &hdr);
 	encode_allocate(xdr, args, &hdr);
 	encode_getfattr(xdr, args->falloc_bitmask, &hdr);
 	encode_nops(&hdr);
 }

 static void encode_copy_commit(struct xdr_stream *xdr,
 			  const struct nfs42_copy_args *args,
 			  struct compound_hdr *hdr)
 {
 	__be32 *p;

 	encode_op_hdr(xdr, OP_COMMIT, decode_commit_maxsz, hdr);
 	p = reserve_space(xdr, 12);
 	p = xdr_encode_hyper(p, args->dst_pos);
 	*p = cpu_to_be32(args->count);
 }

 /*
  * Encode COPY request
  */
 static void nfs4_xdr_enc_copy(struct rpc_rqst *req,
 			      struct xdr_stream *xdr,
 			      const void *data)
 {
 	const struct nfs42_copy_args *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->src_fh, &hdr);
 	encode_savefh(xdr, &hdr);
 	encode_putfh(xdr, args->dst_fh, &hdr);
 	encode_copy(xdr, args, &hdr);
 	if (args->sync)
 		encode_copy_commit(xdr, args, &hdr);
 	encode_nops(&hdr);
 }

 /*
  * Encode OFFLOAD_CANEL request
  */
 static void nfs4_xdr_enc_offload_cancel(struct rpc_rqst *req,
 					struct xdr_stream *xdr,
 					const void *data)
 {
 	const struct nfs42_offload_status_args *args = data;
 	struct compound_hdr hdr = {
 		.minorversion = nfs4_xdr_minorversion(&args->osa_seq_args),
 	};

 	encode_compound_hdr(xdr, req, &hdr);
 	encode_sequence(xdr, &args->osa_seq_args, &hdr);
 	encode_putfh(xdr, args->osa_src_fh, &hdr);
 	encode_offload_cancel(xdr, args, &hdr);
 	encode_nops(&hdr);
 }

 /*
  * Encode DEALLOCATE request
  */
 static void nfs4_xdr_enc_deallocate(struct rpc_rqst *req,
 				    struct xdr_stream *xdr,
 				    const void *data)
 {
 	const struct nfs42_falloc_args *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->falloc_fh, &hdr);
 	encode_deallocate(xdr, args, &hdr);
 	encode_getfattr(xdr, args->falloc_bitmask, &hdr);
 	encode_nops(&hdr);
 }

 /*
  * Encode SEEK request
  */
 static void nfs4_xdr_enc_seek(struct rpc_rqst *req,
 			      struct xdr_stream *xdr,
 			      const void *data)
 {
 	const struct nfs42_seek_args *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->sa_fh, &hdr);
 	encode_seek(xdr, args, &hdr);
 	encode_nops(&hdr);
 }

 /*
  * Encode LAYOUTSTATS request
  */
 static void nfs4_xdr_enc_layoutstats(struct rpc_rqst *req,
 				     struct xdr_stream *xdr,
 				     const void *data)
 {
 	const struct nfs42_layoutstat_args *args = data;
 	int i;

 	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);
 	WARN_ON(args->num_dev > PNFS_LAYOUTSTATS_MAXDEV);
 	for (i = 0; i < args->num_dev; i++)
 		encode_layoutstats(xdr, args, &args->devinfo[i], &hdr);
 	encode_nops(&hdr);
 }

 /*
  * Encode CLONE request
  */
 static void nfs4_xdr_enc_clone(struct rpc_rqst *req,
 			       struct xdr_stream *xdr,
 			       const void *data)
 {
 	const struct nfs42_clone_args *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->src_fh, &hdr);
 	encode_savefh(xdr, &hdr);
 	encode_putfh(xdr, args->dst_fh, &hdr);
 	encode_clone(xdr, args, &hdr);
 	encode_getfattr(xdr, args->dst_bitmask, &hdr);
 	encode_nops(&hdr);
 }

 /*
  * Encode LAYOUTERROR request
  */
 static void nfs4_xdr_enc_layouterror(struct rpc_rqst *req,
 				     struct xdr_stream *xdr,
 				     const void *data)
 {
 	const struct nfs42_layouterror_args *args = data;
 	struct compound_hdr hdr = {
 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
 	};
 	int i;

 	encode_compound_hdr(xdr, req, &hdr);
 	encode_sequence(xdr, &args->seq_args, &hdr);
 	encode_putfh(xdr, NFS_FH(args->inode), &hdr);
 	for (i = 0; i < args->num_errors; i++)
 		encode_layouterror(xdr, &args->errors[i], &hdr);
 	encode_nops(&hdr);
 }

 static int decode_allocate(struct xdr_stream *xdr, struct nfs42_falloc_res *res)
 {
 	return decode_op_hdr(xdr, OP_ALLOCATE);
 }

 static int decode_write_response(struct xdr_stream *xdr,
 				 struct nfs42_write_res *res)
 {
 	__be32 *p;
 	int status, count;

 	p = xdr_inline_decode(xdr, 4);
 	if (unlikely(!p))
 		return -EIO;
 	count = be32_to_cpup(p);
 	if (count > 1)
 		return -EREMOTEIO;
 	else if (count == 1) {
 		status = decode_opaque_fixed(xdr, &res->stateid,
 				NFS4_STATEID_SIZE);
 		if (unlikely(status))
 			return -EIO;
 	}
 	p = xdr_inline_decode(xdr, 8 + 4);
 	if (unlikely(!p))
 		return -EIO;
 	p = xdr_decode_hyper(p, &res->count);
 	res->verifier.committed = be32_to_cpup(p);
 	return decode_verifier(xdr, &res->verifier.verifier);
 }

 static int decode_copy_requirements(struct xdr_stream *xdr,
 				    struct nfs42_copy_res *res) {
 	__be32 *p;

 	p = xdr_inline_decode(xdr, 4 + 4);
 	if (unlikely(!p))
 		return -EIO;

 	res->consecutive = be32_to_cpup(p++);
 	res->synchronous = be32_to_cpup(p++);
 	return 0;
 }

 static int decode_copy(struct xdr_stream *xdr, struct nfs42_copy_res *res)
 {
 	int status;

 	status = decode_op_hdr(xdr, OP_COPY);
 	if (status == NFS4ERR_OFFLOAD_NO_REQS) {
 		status = decode_copy_requirements(xdr, res);
 		if (status)
 			return status;
 		return NFS4ERR_OFFLOAD_NO_REQS;
 	} else if (status)
 		return status;

 	status = decode_write_response(xdr, &res->write_res);
 	if (status)
 		return status;

 	return decode_copy_requirements(xdr, res);
 }

 static int decode_offload_cancel(struct xdr_stream *xdr,
 				 struct nfs42_offload_status_res *res)
 {
 	return decode_op_hdr(xdr, OP_OFFLOAD_CANCEL);
 }

 static int decode_deallocate(struct xdr_stream *xdr, struct nfs42_falloc_res *res)
 {
 	return decode_op_hdr(xdr, OP_DEALLOCATE);
 }

 static int decode_seek(struct xdr_stream *xdr, struct nfs42_seek_res *res)
 {
 	int status;
 	__be32 *p;

 	status = decode_op_hdr(xdr, OP_SEEK);
 	if (status)
 		return status;

 	p = xdr_inline_decode(xdr, 4 + 8);
 	if (unlikely(!p))
 		return -EIO;

 	res->sr_eof = be32_to_cpup(p++);
 	p = xdr_decode_hyper(p, &res->sr_offset);
 	return 0;
 }

 static int decode_layoutstats(struct xdr_stream *xdr)
 {
 	return decode_op_hdr(xdr, OP_LAYOUTSTATS);
 }

 static int decode_clone(struct xdr_stream *xdr)
 {
 	return decode_op_hdr(xdr, OP_CLONE);
 }

 static int decode_layouterror(struct xdr_stream *xdr)
 {
 	return decode_op_hdr(xdr, OP_LAYOUTERROR);
 }

 /*
  * Decode ALLOCATE request
  */
 static int nfs4_xdr_dec_allocate(struct rpc_rqst *rqstp,
 				 struct xdr_stream *xdr,
 				 void *data)
 {
 	struct nfs42_falloc_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_allocate(xdr, res);
 	if (status)
 		goto out;
 	decode_getfattr(xdr, res->falloc_fattr, res->falloc_server);
 out:
 	return status;
 }

 /*
  * Decode COPY response
  */
 static int nfs4_xdr_dec_copy(struct rpc_rqst *rqstp,
 			     struct xdr_stream *xdr,
 			     void *data)
 {
 	struct nfs42_copy_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_savefh(xdr);
 	if (status)
 		goto out;
 	status = decode_putfh(xdr);
 	if (status)
 		goto out;
 	status = decode_copy(xdr, res);
 	if (status)
 		goto out;
 	if (res->commit_res.verf)
 		status = decode_commit(xdr, &res->commit_res);
 out:
 	return status;
 }

 /*
  * Decode OFFLOAD_CANCEL response
  */
 static int nfs4_xdr_dec_offload_cancel(struct rpc_rqst *rqstp,
 				       struct xdr_stream *xdr,
 				       void *data)
 {
 	struct nfs42_offload_status_res *res = data;
 	struct compound_hdr hdr;
 	int status;

 	status = decode_compound_hdr(xdr, &hdr);
 	if (status)
 		goto out;
 	status = decode_sequence(xdr, &res->osr_seq_res, rqstp);
 	if (status)
 		goto out;
 	status = decode_putfh(xdr);
 	if (status)
 		goto out;
 	status = decode_offload_cancel(xdr, res);

 out:
 	return status;
 }

 /*
  * Decode DEALLOCATE request
  */
 static int nfs4_xdr_dec_deallocate(struct rpc_rqst *rqstp,
 				   struct xdr_stream *xdr,
 				   void *data)
 {
 	struct nfs42_falloc_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_deallocate(xdr, res);
 	if (status)
 		goto out;
 	decode_getfattr(xdr, res->falloc_fattr, res->falloc_server);
 out:
 	return status;
 }

 /*
  * Decode SEEK request
  */
 static int nfs4_xdr_dec_seek(struct rpc_rqst *rqstp,
 			     struct xdr_stream *xdr,
 			     void *data)
 {
 	struct nfs42_seek_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_seek(xdr, res);
 out:
 	return status;
 }

 /*
  * Decode LAYOUTSTATS request
  */
 static int nfs4_xdr_dec_layoutstats(struct rpc_rqst *rqstp,
 				    struct xdr_stream *xdr,
 				    void *data)
 {
 	struct nfs42_layoutstat_res *res = data;
 	struct compound_hdr hdr;
 	int status, i;

 	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;
 	WARN_ON(res->num_dev > PNFS_LAYOUTSTATS_MAXDEV);
 	for (i = 0; i < res->num_dev; i++) {
 		status = decode_layoutstats(xdr);
 		if (status)
 			goto out;
 	}
 out:
 	res->rpc_status = status;
 	return status;
 }

 /*
  * Decode CLONE request
  */
 static int nfs4_xdr_dec_clone(struct rpc_rqst *rqstp,
 			      struct xdr_stream *xdr,
 			      void *data)
 {
 	struct nfs42_clone_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_savefh(xdr);
 	if (status)
 		goto out;
 	status = decode_putfh(xdr);
 	if (status)
 		goto out;
 	status = decode_clone(xdr);
 	if (status)
 		goto out;
 	decode_getfattr(xdr, res->dst_fattr, res->server);
 out:
 	res->rpc_status = status;
 	return status;
 }

 /*
  * Decode LAYOUTERROR request
  */
 static int nfs4_xdr_dec_layouterror(struct rpc_rqst *rqstp,
 				    struct xdr_stream *xdr,
 				    void *data)
 {
 	struct nfs42_layouterror_res *res = data;
 	struct compound_hdr hdr;
 	int status, i;

 	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);

 	for (i = 0; i < res->num_errors && status == 0; i++)
 		status = decode_layouterror(xdr);
 out:
 	res->rpc_status = status;
 	return status;
 }

 #endif /* __LINUX_FS_NFS_NFS4_2XDR_H */
	// SPDX-License-Identifier: GPL-2.0
	/*
	* Copyright (c) 2014 Anna Schumaker <Anna.Schumaker@Netapp.com>
	*/
	#ifndef __LINUX_FS_NFS_NFS4_2XDR_H
	#define __LINUX_FS_NFS_NFS4_2XDR_H

	#include "nfs42.h"

	#define encode_fallocate_maxsz (encode_stateid_maxsz + \
	2 /* offset */ + \
	2 /* length */)
	#define NFS42_WRITE_RES_SIZE (1 /* wr_callback_id size */ +\
	XDR_QUADLEN(NFS4_STATEID_SIZE) + \
	2 /* wr_count */ + \
	1 /* wr_committed */ + \
	XDR_QUADLEN(NFS4_VERIFIER_SIZE))
	#define encode_allocate_maxsz (op_encode_hdr_maxsz + \
	encode_fallocate_maxsz)
	#define decode_allocate_maxsz (op_decode_hdr_maxsz)
	#define encode_copy_maxsz (op_encode_hdr_maxsz + \
	XDR_QUADLEN(NFS4_STATEID_SIZE) + \
	XDR_QUADLEN(NFS4_STATEID_SIZE) + \
	2 + 2 + 2 + 1 + 1 + 1)
	#define decode_copy_maxsz (op_decode_hdr_maxsz + \
	NFS42_WRITE_RES_SIZE + \
	1 /* cr_consecutive */ + \
	1 /* cr_synchronous */)
	#define encode_offload_cancel_maxsz (op_encode_hdr_maxsz + \
	XDR_QUADLEN(NFS4_STATEID_SIZE))
	#define decode_offload_cancel_maxsz (op_decode_hdr_maxsz)
	#define encode_deallocate_maxsz (op_encode_hdr_maxsz + \
	encode_fallocate_maxsz)
	#define decode_deallocate_maxsz (op_decode_hdr_maxsz)
	#define encode_seek_maxsz (op_encode_hdr_maxsz + \
	encode_stateid_maxsz + \
	2 /* offset */ + \
	1 /* whence */)
	#define decode_seek_maxsz (op_decode_hdr_maxsz + \
	1 /* eof */ + \
	1 /* whence */ + \
	2 /* offset */ + \
	2 /* length */)
	#define encode_io_info_maxsz 4
	#define encode_layoutstats_maxsz (op_decode_hdr_maxsz + \
	2 /* offset */ + \
	2 /* length */ + \
	encode_stateid_maxsz + \
	encode_io_info_maxsz + \
	encode_io_info_maxsz + \
	1 /* opaque devaddr4 length */ + \
	XDR_QUADLEN(PNFS_LAYOUTSTATS_MAXSIZE))
	#define decode_layoutstats_maxsz (op_decode_hdr_maxsz)
	#define encode_device_error_maxsz (XDR_QUADLEN(NFS4_DEVICEID4_SIZE) + \
	1 /* status / + 1 / opnum */)
	#define encode_layouterror_maxsz (op_decode_hdr_maxsz + \
	2 /* offset */ + \
	2 /* length */ + \
	encode_stateid_maxsz + \
	1 /* Array size */ + \
	encode_device_error_maxsz)
	#define decode_layouterror_maxsz (op_decode_hdr_maxsz)
	#define encode_clone_maxsz (encode_stateid_maxsz + \
	encode_stateid_maxsz + \
	2 /* src offset */ + \
	2 /* dst offset */ + \
	2 /* count */)
	#define decode_clone_maxsz (op_decode_hdr_maxsz)

	#define NFS4_enc_allocate_sz (compound_encode_hdr_maxsz + \
	encode_sequence_maxsz + \
	encode_putfh_maxsz + \
	encode_allocate_maxsz + \
	encode_getattr_maxsz)
	#define NFS4_dec_allocate_sz (compound_decode_hdr_maxsz + \
	decode_sequence_maxsz + \
	decode_putfh_maxsz + \
	decode_allocate_maxsz + \
	decode_getattr_maxsz)
	#define NFS4_enc_copy_sz (compound_encode_hdr_maxsz + \
	encode_sequence_maxsz + \
	encode_putfh_maxsz + \
	encode_savefh_maxsz + \
	encode_putfh_maxsz + \
	encode_copy_maxsz + \
	encode_commit_maxsz)
	#define NFS4_dec_copy_sz (compound_decode_hdr_maxsz + \
	decode_sequence_maxsz + \
	decode_putfh_maxsz + \
	decode_savefh_maxsz + \
	decode_putfh_maxsz + \
	decode_copy_maxsz + \
	decode_commit_maxsz)
	#define NFS4_enc_offload_cancel_sz (compound_encode_hdr_maxsz + \
	encode_sequence_maxsz + \
	encode_putfh_maxsz + \
	encode_offload_cancel_maxsz)
	#define NFS4_dec_offload_cancel_sz (compound_decode_hdr_maxsz + \
	decode_sequence_maxsz + \
	decode_putfh_maxsz + \
	decode_offload_cancel_maxsz)
	#define NFS4_enc_deallocate_sz (compound_encode_hdr_maxsz + \
	encode_sequence_maxsz + \
	encode_putfh_maxsz + \
	encode_deallocate_maxsz + \
	encode_getattr_maxsz)
	#define NFS4_dec_deallocate_sz (compound_decode_hdr_maxsz + \
	decode_sequence_maxsz + \
	decode_putfh_maxsz + \
	decode_deallocate_maxsz + \
	decode_getattr_maxsz)
	#define NFS4_enc_seek_sz (compound_encode_hdr_maxsz + \
	encode_sequence_maxsz + \
	encode_putfh_maxsz + \
	encode_seek_maxsz)
	#define NFS4_dec_seek_sz (compound_decode_hdr_maxsz + \
	decode_sequence_maxsz + \
	decode_putfh_maxsz + \
	decode_seek_maxsz)
	#define NFS4_enc_layoutstats_sz (compound_encode_hdr_maxsz + \
	encode_sequence_maxsz + \
	encode_putfh_maxsz + \
	PNFS_LAYOUTSTATS_MAXDEV * encode_layoutstats_maxsz)
	#define NFS4_dec_layoutstats_sz (compound_decode_hdr_maxsz + \
	decode_sequence_maxsz + \
	decode_putfh_maxsz + \
	PNFS_LAYOUTSTATS_MAXDEV * decode_layoutstats_maxsz)
	#define NFS4_enc_layouterror_sz (compound_encode_hdr_maxsz + \
	encode_sequence_maxsz + \
	encode_putfh_maxsz + \
	NFS42_LAYOUTERROR_MAX * \
	encode_layouterror_maxsz)
	#define NFS4_dec_layouterror_sz (compound_decode_hdr_maxsz + \
	decode_sequence_maxsz + \
	decode_putfh_maxsz + \
	NFS42_LAYOUTERROR_MAX * \
	decode_layouterror_maxsz)
	#define NFS4_enc_clone_sz (compound_encode_hdr_maxsz + \
	encode_sequence_maxsz + \
	encode_putfh_maxsz + \
	encode_savefh_maxsz + \
	encode_putfh_maxsz + \
	encode_clone_maxsz + \
	encode_getattr_maxsz)
	#define NFS4_dec_clone_sz (compound_decode_hdr_maxsz + \
	decode_sequence_maxsz + \
	decode_putfh_maxsz + \
	decode_savefh_maxsz + \
	decode_putfh_maxsz + \
	decode_clone_maxsz + \
	decode_getattr_maxsz)

	static void encode_fallocate(struct xdr_stream *xdr,
	const struct nfs42_falloc_args *args)
	{
	encode_nfs4_stateid(xdr, &args->falloc_stateid);
	encode_uint64(xdr, args->falloc_offset);
	encode_uint64(xdr, args->falloc_length);
	}

	static void encode_allocate(struct xdr_stream *xdr,
	const struct nfs42_falloc_args *args,
	struct compound_hdr *hdr)
	{
	encode_op_hdr(xdr, OP_ALLOCATE, decode_allocate_maxsz, hdr);
	encode_fallocate(xdr, args);
	}

	static void encode_copy(struct xdr_stream *xdr,
	const struct nfs42_copy_args *args,
	struct compound_hdr *hdr)
	{
	encode_op_hdr(xdr, OP_COPY, decode_copy_maxsz, hdr);
	encode_nfs4_stateid(xdr, &args->src_stateid);
	encode_nfs4_stateid(xdr, &args->dst_stateid);

	encode_uint64(xdr, args->src_pos);
	encode_uint64(xdr, args->dst_pos);
	encode_uint64(xdr, args->count);

	encode_uint32(xdr, 1); /* consecutive = true */
	encode_uint32(xdr, args->sync);
	encode_uint32(xdr, 0); /* src server list */
	}

	static void encode_offload_cancel(struct xdr_stream *xdr,
	const struct nfs42_offload_status_args *args,
	struct compound_hdr *hdr)
	{
	encode_op_hdr(xdr, OP_OFFLOAD_CANCEL, decode_offload_cancel_maxsz, hdr);
	encode_nfs4_stateid(xdr, &args->osa_stateid);
	}

	static void encode_deallocate(struct xdr_stream *xdr,
	const struct nfs42_falloc_args *args,
	struct compound_hdr *hdr)
	{
	encode_op_hdr(xdr, OP_DEALLOCATE, decode_deallocate_maxsz, hdr);
	encode_fallocate(xdr, args);
	}

	static void encode_seek(struct xdr_stream *xdr,
	const struct nfs42_seek_args *args,
	struct compound_hdr *hdr)
	{
	encode_op_hdr(xdr, OP_SEEK, decode_seek_maxsz, hdr);
	encode_nfs4_stateid(xdr, &args->sa_stateid);
	encode_uint64(xdr, args->sa_offset);
	encode_uint32(xdr, args->sa_what);
	}

	static void encode_layoutstats(struct xdr_stream *xdr,
	const struct nfs42_layoutstat_args *args,
	struct nfs42_layoutstat_devinfo *devinfo,
	struct compound_hdr *hdr)
	{
	__be32 *p;

	encode_op_hdr(xdr, OP_LAYOUTSTATS, decode_layoutstats_maxsz, hdr);
	p = reserve_space(xdr, 8 + 8);
	p = xdr_encode_hyper(p, devinfo->offset);
	p = xdr_encode_hyper(p, devinfo->length);
	encode_nfs4_stateid(xdr, &args->stateid);
	p = reserve_space(xdr, 4*8 + NFS4_DEVICEID4_SIZE + 4);
	p = xdr_encode_hyper(p, devinfo->read_count);
	p = xdr_encode_hyper(p, devinfo->read_bytes);
	p = xdr_encode_hyper(p, devinfo->write_count);
	p = xdr_encode_hyper(p, devinfo->write_bytes);
	p = xdr_encode_opaque_fixed(p, devinfo->dev_id.data,
	NFS4_DEVICEID4_SIZE);
	/* Encode layoutupdate4 */
	*p++ = cpu_to_be32(devinfo->layout_type);
	if (devinfo->ld_private.ops)
	devinfo->ld_private.ops->encode(xdr, args,
	&devinfo->ld_private);
	else
	encode_uint32(xdr, 0);
	}

	static void encode_clone(struct xdr_stream *xdr,
	const struct nfs42_clone_args *args,
	struct compound_hdr *hdr)
	{
	__be32 *p;

	encode_op_hdr(xdr, OP_CLONE, decode_clone_maxsz, hdr);
	encode_nfs4_stateid(xdr, &args->src_stateid);
	encode_nfs4_stateid(xdr, &args->dst_stateid);
	p = reserve_space(xdr, 3*8);
	p = xdr_encode_hyper(p, args->src_offset);
	p = xdr_encode_hyper(p, args->dst_offset);
	xdr_encode_hyper(p, args->count);
	}

	static void encode_device_error(struct xdr_stream *xdr,
	const struct nfs42_device_error *error)
	{
	__be32 *p;

	p = reserve_space(xdr, NFS4_DEVICEID4_SIZE + 2*4);
	p = xdr_encode_opaque_fixed(p, error->dev_id.data,
	NFS4_DEVICEID4_SIZE);
	*p++ = cpu_to_be32(error->status);
	*p = cpu_to_be32(error->opnum);
	}

	static void encode_layouterror(struct xdr_stream *xdr,
	const struct nfs42_layout_error *args,
	struct compound_hdr *hdr)
	{
	__be32 *p;

	encode_op_hdr(xdr, OP_LAYOUTERROR, decode_layouterror_maxsz, hdr);
	p = reserve_space(xdr, 8 + 8);
	p = xdr_encode_hyper(p, args->offset);
	p = xdr_encode_hyper(p, args->length);
	encode_nfs4_stateid(xdr, &args->stateid);
	p = reserve_space(xdr, 4);
	*p = cpu_to_be32(1);
	encode_device_error(xdr, &args->errors[0]);
	}

	/*
	* Encode ALLOCATE request
	*/
	static void nfs4_xdr_enc_allocate(struct rpc_rqst *req,
	struct xdr_stream *xdr,
	const void *data)
	{
	const struct nfs42_falloc_args *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->falloc_fh, &hdr);
	encode_allocate(xdr, args, &hdr);
	encode_getfattr(xdr, args->falloc_bitmask, &hdr);
	encode_nops(&hdr);
	}

	static void encode_copy_commit(struct xdr_stream *xdr,
	const struct nfs42_copy_args *args,
	struct compound_hdr *hdr)
	{
	__be32 *p;

	encode_op_hdr(xdr, OP_COMMIT, decode_commit_maxsz, hdr);
	p = reserve_space(xdr, 12);
	p = xdr_encode_hyper(p, args->dst_pos);
	*p = cpu_to_be32(args->count);
	}

	/*
	* Encode COPY request
	*/
	static void nfs4_xdr_enc_copy(struct rpc_rqst *req,
	struct xdr_stream *xdr,
	const void *data)
	{
	const struct nfs42_copy_args *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->src_fh, &hdr);
	encode_savefh(xdr, &hdr);
	encode_putfh(xdr, args->dst_fh, &hdr);
	encode_copy(xdr, args, &hdr);
	if (args->sync)
	encode_copy_commit(xdr, args, &hdr);
	encode_nops(&hdr);
	}

	/*
	* Encode OFFLOAD_CANEL request
	*/
	static void nfs4_xdr_enc_offload_cancel(struct rpc_rqst *req,
	struct xdr_stream *xdr,
	const void *data)
	{
	const struct nfs42_offload_status_args *args = data;
	struct compound_hdr hdr = {
	.minorversion = nfs4_xdr_minorversion(&args->osa_seq_args),
	};

	encode_compound_hdr(xdr, req, &hdr);
	encode_sequence(xdr, &args->osa_seq_args, &hdr);
	encode_putfh(xdr, args->osa_src_fh, &hdr);
	encode_offload_cancel(xdr, args, &hdr);
	encode_nops(&hdr);
	}

	/*
	* Encode DEALLOCATE request
	*/
	static void nfs4_xdr_enc_deallocate(struct rpc_rqst *req,
	struct xdr_stream *xdr,
	const void *data)
	{
	const struct nfs42_falloc_args *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->falloc_fh, &hdr);
	encode_deallocate(xdr, args, &hdr);
	encode_getfattr(xdr, args->falloc_bitmask, &hdr);
	encode_nops(&hdr);
	}

	/*
	* Encode SEEK request
	*/
	static void nfs4_xdr_enc_seek(struct rpc_rqst *req,
	struct xdr_stream *xdr,
	const void *data)
	{
	const struct nfs42_seek_args *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->sa_fh, &hdr);
	encode_seek(xdr, args, &hdr);
	encode_nops(&hdr);
	}

	/*
	* Encode LAYOUTSTATS request
	*/
	static void nfs4_xdr_enc_layoutstats(struct rpc_rqst *req,
	struct xdr_stream *xdr,
	const void *data)
	{
	const struct nfs42_layoutstat_args *args = data;
	int i;

	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);
	WARN_ON(args->num_dev > PNFS_LAYOUTSTATS_MAXDEV);
	for (i = 0; i < args->num_dev; i++)
	encode_layoutstats(xdr, args, &args->devinfo[i], &hdr);
	encode_nops(&hdr);
	}

	/*
	* Encode CLONE request
	*/
	static void nfs4_xdr_enc_clone(struct rpc_rqst *req,
	struct xdr_stream *xdr,
	const void *data)
	{
	const struct nfs42_clone_args *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->src_fh, &hdr);
	encode_savefh(xdr, &hdr);
	encode_putfh(xdr, args->dst_fh, &hdr);
	encode_clone(xdr, args, &hdr);
	encode_getfattr(xdr, args->dst_bitmask, &hdr);
	encode_nops(&hdr);
	}

	/*
	* Encode LAYOUTERROR request
	*/
	static void nfs4_xdr_enc_layouterror(struct rpc_rqst *req,
	struct xdr_stream *xdr,
	const void *data)
	{
	const struct nfs42_layouterror_args *args = data;
	struct compound_hdr hdr = {
	.minorversion = nfs4_xdr_minorversion(&args->seq_args),
	};
	int i;

	encode_compound_hdr(xdr, req, &hdr);
	encode_sequence(xdr, &args->seq_args, &hdr);
	encode_putfh(xdr, NFS_FH(args->inode), &hdr);
	for (i = 0; i < args->num_errors; i++)
	encode_layouterror(xdr, &args->errors[i], &hdr);
	encode_nops(&hdr);
	}

	static int decode_allocate(struct xdr_stream xdr, struct nfs42_falloc_res res)
	{
	return decode_op_hdr(xdr, OP_ALLOCATE);
	}

	static int decode_write_response(struct xdr_stream *xdr,
	struct nfs42_write_res *res)
	{
	__be32 *p;
	int status, count;

	p = xdr_inline_decode(xdr, 4);
	if (unlikely(!p))
	return -EIO;
	count = be32_to_cpup(p);
	if (count > 1)
	return -EREMOTEIO;
	else if (count == 1) {
	status = decode_opaque_fixed(xdr, &res->stateid,
	NFS4_STATEID_SIZE);
	if (unlikely(status))
	return -EIO;
	}
	p = xdr_inline_decode(xdr, 8 + 4);
	if (unlikely(!p))
	return -EIO;
	p = xdr_decode_hyper(p, &res->count);
	res->verifier.committed = be32_to_cpup(p);
	return decode_verifier(xdr, &res->verifier.verifier);
	}

	static int decode_copy_requirements(struct xdr_stream *xdr,
	struct nfs42_copy_res *res) {
	__be32 *p;

	p = xdr_inline_decode(xdr, 4 + 4);
	if (unlikely(!p))
	return -EIO;

	res->consecutive = be32_to_cpup(p++);
	res->synchronous = be32_to_cpup(p++);
	return 0;
	}

	static int decode_copy(struct xdr_stream xdr, struct nfs42_copy_res res)
	{
	int status;

	status = decode_op_hdr(xdr, OP_COPY);
	if (status == NFS4ERR_OFFLOAD_NO_REQS) {
	status = decode_copy_requirements(xdr, res);
	if (status)
	return status;
	return NFS4ERR_OFFLOAD_NO_REQS;
	} else if (status)
	return status;

	status = decode_write_response(xdr, &res->write_res);
	if (status)
	return status;

	return decode_copy_requirements(xdr, res);
	}

	static int decode_offload_cancel(struct xdr_stream *xdr,
	struct nfs42_offload_status_res *res)
	{
	return decode_op_hdr(xdr, OP_OFFLOAD_CANCEL);
	}

	static int decode_deallocate(struct xdr_stream xdr, struct nfs42_falloc_res res)
	{
	return decode_op_hdr(xdr, OP_DEALLOCATE);
	}

	static int decode_seek(struct xdr_stream xdr, struct nfs42_seek_res res)
	{
	int status;
	__be32 *p;

	status = decode_op_hdr(xdr, OP_SEEK);
	if (status)
	return status;

	p = xdr_inline_decode(xdr, 4 + 8);
	if (unlikely(!p))
	return -EIO;

	res->sr_eof = be32_to_cpup(p++);
	p = xdr_decode_hyper(p, &res->sr_offset);
	return 0;
	}

	static int decode_layoutstats(struct xdr_stream *xdr)
	{
	return decode_op_hdr(xdr, OP_LAYOUTSTATS);
	}

	static int decode_clone(struct xdr_stream *xdr)
	{
	return decode_op_hdr(xdr, OP_CLONE);
	}

	static int decode_layouterror(struct xdr_stream *xdr)
	{
	return decode_op_hdr(xdr, OP_LAYOUTERROR);
	}

	/*
	* Decode ALLOCATE request
	*/
	static int nfs4_xdr_dec_allocate(struct rpc_rqst *rqstp,
	struct xdr_stream *xdr,
	void *data)
	{
	struct nfs42_falloc_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_allocate(xdr, res);
	if (status)
	goto out;
	decode_getfattr(xdr, res->falloc_fattr, res->falloc_server);
	out:
	return status;
	}

	/*
	* Decode COPY response
	*/
	static int nfs4_xdr_dec_copy(struct rpc_rqst *rqstp,
	struct xdr_stream *xdr,
	void *data)
	{
	struct nfs42_copy_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_savefh(xdr);
	if (status)
	goto out;
	status = decode_putfh(xdr);
	if (status)
	goto out;
	status = decode_copy(xdr, res);
	if (status)
	goto out;
	if (res->commit_res.verf)
	status = decode_commit(xdr, &res->commit_res);
	out:
	return status;
	}

	/*
	* Decode OFFLOAD_CANCEL response
	*/
	static int nfs4_xdr_dec_offload_cancel(struct rpc_rqst *rqstp,
	struct xdr_stream *xdr,
	void *data)
	{
	struct nfs42_offload_status_res *res = data;
	struct compound_hdr hdr;
	int status;

	status = decode_compound_hdr(xdr, &hdr);
	if (status)
	goto out;
	status = decode_sequence(xdr, &res->osr_seq_res, rqstp);
	if (status)
	goto out;
	status = decode_putfh(xdr);
	if (status)
	goto out;
	status = decode_offload_cancel(xdr, res);

	out:
	return status;
	}

	/*
	* Decode DEALLOCATE request
	*/
	static int nfs4_xdr_dec_deallocate(struct rpc_rqst *rqstp,
	struct xdr_stream *xdr,
	void *data)
	{
	struct nfs42_falloc_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_deallocate(xdr, res);
	if (status)
	goto out;
	decode_getfattr(xdr, res->falloc_fattr, res->falloc_server);
	out:
	return status;
	}

	/*
	* Decode SEEK request
	*/
	static int nfs4_xdr_dec_seek(struct rpc_rqst *rqstp,
	struct xdr_stream *xdr,
	void *data)
	{
	struct nfs42_seek_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_seek(xdr, res);
	out:
	return status;
	}

	/*
	* Decode LAYOUTSTATS request
	*/
	static int nfs4_xdr_dec_layoutstats(struct rpc_rqst *rqstp,
	struct xdr_stream *xdr,
	void *data)
	{
	struct nfs42_layoutstat_res *res = data;
	struct compound_hdr hdr;
	int status, i;

	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;
	WARN_ON(res->num_dev > PNFS_LAYOUTSTATS_MAXDEV);
	for (i = 0; i < res->num_dev; i++) {
	status = decode_layoutstats(xdr);
	if (status)
	goto out;
	}
	out:
	res->rpc_status = status;
	return status;
	}

	/*
	* Decode CLONE request
	*/
	static int nfs4_xdr_dec_clone(struct rpc_rqst *rqstp,
	struct xdr_stream *xdr,
	void *data)
	{
	struct nfs42_clone_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_savefh(xdr);
	if (status)
	goto out;
	status = decode_putfh(xdr);
	if (status)
	goto out;
	status = decode_clone(xdr);
	if (status)
	goto out;
	decode_getfattr(xdr, res->dst_fattr, res->server);
	out:
	res->rpc_status = status;
	return status;
	}

	/*
	* Decode LAYOUTERROR request
	*/
	static int nfs4_xdr_dec_layouterror(struct rpc_rqst *rqstp,
	struct xdr_stream *xdr,
	void *data)
	{
	struct nfs42_layouterror_res *res = data;
	struct compound_hdr hdr;
	int status, i;

	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);

	for (i = 0; i < res->num_errors && status == 0; i++)
	status = decode_layouterror(xdr);
	out:
	res->rpc_status = status;
	return status;
	}

	#endif /* __LINUX_FS_NFS_NFS4_2XDR_H */