/*
 * 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_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_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_putfh_maxsz + \
					 encode_allocate_maxsz + \
					 encode_getattr_maxsz)
#define NFS4_dec_allocate_sz		(compound_decode_hdr_maxsz + \
					 decode_putfh_maxsz + \
					 decode_allocate_maxsz + \
					 decode_getattr_maxsz)
#define NFS4_enc_copy_sz		(compound_encode_hdr_maxsz + \
					 encode_putfh_maxsz + \
					 encode_savefh_maxsz + \
					 encode_putfh_maxsz + \
					 encode_copy_maxsz)
#define NFS4_dec_copy_sz		(compound_decode_hdr_maxsz + \
					 decode_putfh_maxsz + \
					 decode_savefh_maxsz + \
					 decode_putfh_maxsz + \
					 decode_copy_maxsz)
#define NFS4_enc_deallocate_sz		(compound_encode_hdr_maxsz + \
					 encode_putfh_maxsz + \
					 encode_deallocate_maxsz + \
					 encode_getattr_maxsz)
#define NFS4_dec_deallocate_sz		(compound_decode_hdr_maxsz + \
					 decode_putfh_maxsz + \
					 decode_deallocate_maxsz + \
					 decode_getattr_maxsz)
#define NFS4_enc_seek_sz		(compound_encode_hdr_maxsz + \
					 encode_putfh_maxsz + \
					 encode_seek_maxsz)
#define NFS4_dec_seek_sz		(compound_decode_hdr_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_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,
			     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,
			    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,
			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, 1); /* synchronous = true */
	encode_uint32(xdr, 0); /* src server list */
}

static void encode_deallocate(struct xdr_stream *xdr,
			      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,
			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,
			       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->layoutstats_encode != NULL)
		devinfo->layoutstats_encode(xdr, args, devinfo);
	else
		encode_uint32(xdr, 0);
}

static void encode_clone(struct xdr_stream *xdr,
			 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);
}

/*
 * Encode ALLOCATE request
 */
static void nfs4_xdr_enc_allocate(struct rpc_rqst *req,
				  struct xdr_stream *xdr,
				  struct nfs42_falloc_args *args)
{
	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);
}

/*
 * Encode COPY request
 */
static void nfs4_xdr_enc_copy(struct rpc_rqst *req,
			      struct xdr_stream *xdr,
			      struct nfs42_copy_args *args)
{
	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);
	encode_nops(&hdr);
}

/*
 * Encode DEALLOCATE request
 */
static void nfs4_xdr_enc_deallocate(struct rpc_rqst *req,
				    struct xdr_stream *xdr,
				    struct nfs42_falloc_args *args)
{
	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,
			      struct nfs42_seek_args *args)
{
	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,
				     struct nfs42_layoutstat_args *args)
{
	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,
			       struct nfs42_clone_args *args)
{
	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);
}

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;

	p = xdr_inline_decode(xdr, 4 + 8 + 4);
	if (unlikely(!p))
		goto out_overflow;

	/*
	 * We never use asynchronous mode, so warn if a server returns
	 * a stateid.
	 */
	if (unlikely(*p != 0)) {
		pr_err_once("%s: server has set unrequested "
				"asynchronous mode\n", __func__);
		return -EREMOTEIO;
	}
	p++;
	p = xdr_decode_hyper(p, &res->count);
	res->verifier.committed = be32_to_cpup(p);
	return decode_verifier(xdr, &res->verifier.verifier);

out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
}

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))
		goto out_overflow;

	res->consecutive = be32_to_cpup(p++);
	res->synchronous = be32_to_cpup(p++);
	return 0;
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
}

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_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))
		goto out_overflow;

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

out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
}

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);
}

/*
 * Decode ALLOCATE request
 */
static int nfs4_xdr_dec_allocate(struct rpc_rqst *rqstp,
				 struct xdr_stream *xdr,
				 struct nfs42_falloc_res *res)
{
	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,
			     struct nfs42_copy_res *res)
{
	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);
out:
	return status;
}

/*
 * Decode DEALLOCATE request
 */
static int nfs4_xdr_dec_deallocate(struct rpc_rqst *rqstp,
				   struct xdr_stream *xdr,
				   struct nfs42_falloc_res *res)
{
	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,
			     struct nfs42_seek_res *res)
{
	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,
				    struct nfs42_layoutstat_res *res)
{
	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,
			      struct nfs42_clone_res *res)
{
	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;
	status = decode_getfattr(xdr, res->dst_fattr, res->server);

out:
	res->rpc_status = status;
	return status;
}

#endif /* __LINUX_FS_NFS_NFS4_2XDR_H */