nfs4xdr.c

		p = xdr_encode_hyper(p, iap->ia_size);
	}
	if (iap->ia_valid & ATTR_MODE) {
		bmval1 |= FATTR4_WORD1_MODE;
		*p++ = cpu_to_be32(iap->ia_mode & S_IALLUGO);
	}
	if (iap->ia_valid & ATTR_UID) {
		bmval1 |= FATTR4_WORD1_OWNER;
		p = xdr_encode_opaque(p, owner_name, owner_namelen);
	}
	if (iap->ia_valid & ATTR_GID) {
		bmval1 |= FATTR4_WORD1_OWNER_GROUP;
		p = xdr_encode_opaque(p, owner_group, owner_grouplen);
	}
	if (iap->ia_valid & ATTR_ATIME_SET) {
		bmval1 |= FATTR4_WORD1_TIME_ACCESS_SET;
		*p++ = cpu_to_be32(NFS4_SET_TO_CLIENT_TIME);
		*p++ = cpu_to_be32(0);
		*p++ = cpu_to_be32(iap->ia_atime.tv_sec);
		*p++ = cpu_to_be32(iap->ia_atime.tv_nsec);
	}
	else if (iap->ia_valid & ATTR_ATIME) {
		bmval1 |= FATTR4_WORD1_TIME_ACCESS_SET;
		*p++ = cpu_to_be32(NFS4_SET_TO_SERVER_TIME);
	}
	if (iap->ia_valid & ATTR_MTIME_SET) {
		bmval1 |= FATTR4_WORD1_TIME_MODIFY_SET;
		*p++ = cpu_to_be32(NFS4_SET_TO_CLIENT_TIME);
		*p++ = cpu_to_be32(0);
		*p++ = cpu_to_be32(iap->ia_mtime.tv_sec);
		*p++ = cpu_to_be32(iap->ia_mtime.tv_nsec);
	}
	else if (iap->ia_valid & ATTR_MTIME) {
		bmval1 |= FATTR4_WORD1_TIME_MODIFY_SET;
		*p++ = cpu_to_be32(NFS4_SET_TO_SERVER_TIME);
	}

	/*
	 * Now we backfill the bitmap and the attribute buffer length.
	 */
	if (len != ((char *)p - (char *)q) + 4) {
		printk(KERN_ERR "NFS: Attr length error, %u != %Zu\n",
				len, ((char *)p - (char *)q) + 4);
		BUG();
	}
	len = (char *)p - (char *)q - 12;
	*q++ = htonl(bmval0);
	*q++ = htonl(bmval1);
	*q = htonl(len);

/* out: */
}

static void encode_access(struct xdr_stream *xdr, u32 access, struct compound_hdr *hdr)
{
	__be32 *p;

	p = reserve_space(xdr, 8);
	*p++ = cpu_to_be32(OP_ACCESS);
	*p = cpu_to_be32(access);
	hdr->nops++;
	hdr->replen += decode_access_maxsz;
}

static void encode_close(struct xdr_stream *xdr, const struct nfs_closeargs *arg, struct compound_hdr *hdr)
{
	__be32 *p;

	p = reserve_space(xdr, 8+NFS4_STATEID_SIZE);
	*p++ = cpu_to_be32(OP_CLOSE);
	*p++ = cpu_to_be32(arg->seqid->sequence->counter);
	xdr_encode_opaque_fixed(p, arg->stateid->data, NFS4_STATEID_SIZE);
	hdr->nops++;
	hdr->replen += decode_close_maxsz;
}

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

	p = reserve_space(xdr, 16);
	*p++ = cpu_to_be32(OP_COMMIT);
	p = xdr_encode_hyper(p, args->offset);
	*p = cpu_to_be32(args->count);
	hdr->nops++;
	hdr->replen += decode_commit_maxsz;
}

static void encode_create(struct xdr_stream *xdr, const struct nfs4_create_arg *create, struct compound_hdr *hdr)
{
	__be32 *p;

	p = reserve_space(xdr, 8);
	*p++ = cpu_to_be32(OP_CREATE);
	*p = cpu_to_be32(create->ftype);

	switch (create->ftype) {
	case NF4LNK:
		p = reserve_space(xdr, 4);
		*p = cpu_to_be32(create->u.symlink.len);
		xdr_write_pages(xdr, create->u.symlink.pages, 0, create->u.symlink.len);
		break;

	case NF4BLK: case NF4CHR:
		p = reserve_space(xdr, 8);
		*p++ = cpu_to_be32(create->u.device.specdata1);
		*p = cpu_to_be32(create->u.device.specdata2);
		break;

	default:
		break;
	}

	encode_string(xdr, create->name->len, create->name->name);
	hdr->nops++;
	hdr->replen += decode_create_maxsz;

	encode_attrs(xdr, create->attrs, create->server);
}

static void encode_getattr_one(struct xdr_stream *xdr, uint32_t bitmap, struct compound_hdr *hdr)
{
	__be32 *p;

	p = reserve_space(xdr, 12);
	*p++ = cpu_to_be32(OP_GETATTR);
	*p++ = cpu_to_be32(1);
	*p = cpu_to_be32(bitmap);
	hdr->nops++;
	hdr->replen += decode_getattr_maxsz;
}

static void encode_getattr_two(struct xdr_stream *xdr, uint32_t bm0, uint32_t bm1, struct compound_hdr *hdr)
{
	__be32 *p;

	p = reserve_space(xdr, 16);
	*p++ = cpu_to_be32(OP_GETATTR);
	*p++ = cpu_to_be32(2);
	*p++ = cpu_to_be32(bm0);
	*p = cpu_to_be32(bm1);
	hdr->nops++;
	hdr->replen += decode_getattr_maxsz;
}

static void
encode_getattr_three(struct xdr_stream *xdr,
		     uint32_t bm0, uint32_t bm1, uint32_t bm2,
		     struct compound_hdr *hdr)
{
	__be32 *p;

	p = reserve_space(xdr, 4);
	*p = cpu_to_be32(OP_GETATTR);
	if (bm2) {
		p = reserve_space(xdr, 16);
		*p++ = cpu_to_be32(3);
		*p++ = cpu_to_be32(bm0);
		*p++ = cpu_to_be32(bm1);
		*p = cpu_to_be32(bm2);
	} else if (bm1) {
		p = reserve_space(xdr, 12);
		*p++ = cpu_to_be32(2);
		*p++ = cpu_to_be32(bm0);
		*p = cpu_to_be32(bm1);
	} else {
		p = reserve_space(xdr, 8);
		*p++ = cpu_to_be32(1);
		*p = cpu_to_be32(bm0);
	}
	hdr->nops++;
	hdr->replen += decode_getattr_maxsz;
}

static void encode_getfattr(struct xdr_stream *xdr, const u32* bitmask, struct compound_hdr *hdr)
{
	encode_getattr_two(xdr, bitmask[0] & nfs4_fattr_bitmap[0],
			   bitmask[1] & nfs4_fattr_bitmap[1], hdr);
}

static void encode_fsinfo(struct xdr_stream *xdr, const u32* bitmask, struct compound_hdr *hdr)
{
	encode_getattr_three(xdr,
			     bitmask[0] & nfs4_fsinfo_bitmap[0],
			     bitmask[1] & nfs4_fsinfo_bitmap[1],
			     bitmask[2] & nfs4_fsinfo_bitmap[2],
			     hdr);
}

static void encode_fs_locations(struct xdr_stream *xdr, const u32* bitmask, struct compound_hdr *hdr)
{
	encode_getattr_two(xdr, bitmask[0] & nfs4_fs_locations_bitmap[0],
			   bitmask[1] & nfs4_fs_locations_bitmap[1], hdr);
}

static void encode_getfh(struct xdr_stream *xdr, struct compound_hdr *hdr)
{
	__be32 *p;

	p = reserve_space(xdr, 4);
	*p = cpu_to_be32(OP_GETFH);
	hdr->nops++;
	hdr->replen += decode_getfh_maxsz;
}

static void encode_link(struct xdr_stream *xdr, const struct qstr *name, struct compound_hdr *hdr)
{
	__be32 *p;

	p = reserve_space(xdr, 8 + name->len);
	*p++ = cpu_to_be32(OP_LINK);
	xdr_encode_opaque(p, name->name, name->len);
	hdr->nops++;
	hdr->replen += decode_link_maxsz;
}

static inline int nfs4_lock_type(struct file_lock *fl, int block)
{
	if ((fl->fl_type & (F_RDLCK|F_WRLCK|F_UNLCK)) == F_RDLCK)
		return block ? NFS4_READW_LT : NFS4_READ_LT;
	return block ? NFS4_WRITEW_LT : NFS4_WRITE_LT;
}

static inline uint64_t nfs4_lock_length(struct file_lock *fl)
{
	if (fl->fl_end == OFFSET_MAX)
		return ~(uint64_t)0;
	return fl->fl_end - fl->fl_start + 1;
}

static void encode_lockowner(struct xdr_stream *xdr, const struct nfs_lowner *lowner)
{
	__be32 *p;

	p = reserve_space(xdr, 32);
	p = xdr_encode_hyper(p, lowner->clientid);
	*p++ = cpu_to_be32(20);
	p = xdr_encode_opaque_fixed(p, "lock id:", 8);
	*p++ = cpu_to_be32(lowner->s_dev);
	xdr_encode_hyper(p, lowner->id);
}

/*
 * opcode,type,reclaim,offset,length,new_lock_owner = 32
 * open_seqid,open_stateid,lock_seqid,lock_owner.clientid, lock_owner.id = 40
 */
static void encode_lock(struct xdr_stream *xdr, const struct nfs_lock_args *args, struct compound_hdr *hdr)
{
	__be32 *p;

	p = reserve_space(xdr, 32);
	*p++ = cpu_to_be32(OP_LOCK);
	*p++ = cpu_to_be32(nfs4_lock_type(args->fl, args->block));
	*p++ = cpu_to_be32(args->reclaim);
	p = xdr_encode_hyper(p, args->fl->fl_start);
	p = xdr_encode_hyper(p, nfs4_lock_length(args->fl));
	*p = cpu_to_be32(args->new_lock_owner);
	if (args->new_lock_owner){
		p = reserve_space(xdr, 4+NFS4_STATEID_SIZE+4);
		*p++ = cpu_to_be32(args->open_seqid->sequence->counter);
		p = xdr_encode_opaque_fixed(p, args->open_stateid->data, NFS4_STATEID_SIZE);
		*p++ = cpu_to_be32(args->lock_seqid->sequence->counter);
		encode_lockowner(xdr, &args->lock_owner);
	}
	else {
		p = reserve_space(xdr, NFS4_STATEID_SIZE+4);
		p = xdr_encode_opaque_fixed(p, args->lock_stateid->data, NFS4_STATEID_SIZE);
		*p = cpu_to_be32(args->lock_seqid->sequence->counter);
	}
	hdr->nops++;
	hdr->replen += decode_lock_maxsz;
}

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

	p = reserve_space(xdr, 24);
	*p++ = cpu_to_be32(OP_LOCKT);
	*p++ = cpu_to_be32(nfs4_lock_type(args->fl, 0));
	p = xdr_encode_hyper(p, args->fl->fl_start);
	p = xdr_encode_hyper(p, nfs4_lock_length(args->fl));
	encode_lockowner(xdr, &args->lock_owner);
	hdr->nops++;
	hdr->replen += decode_lockt_maxsz;
}

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

	p = reserve_space(xdr, 12+NFS4_STATEID_SIZE+16);
	*p++ = cpu_to_be32(OP_LOCKU);
	*p++ = cpu_to_be32(nfs4_lock_type(args->fl, 0));
	*p++ = cpu_to_be32(args->seqid->sequence->counter);
	p = xdr_encode_opaque_fixed(p, args->stateid->data, NFS4_STATEID_SIZE);
	p = xdr_encode_hyper(p, args->fl->fl_start);
	xdr_encode_hyper(p, nfs4_lock_length(args->fl));
	hdr->nops++;
	hdr->replen += decode_locku_maxsz;
}

static void encode_release_lockowner(struct xdr_stream *xdr, const struct nfs_lowner *lowner, struct compound_hdr *hdr)
{
	__be32 *p;

	p = reserve_space(xdr, 4);
	*p = cpu_to_be32(OP_RELEASE_LOCKOWNER);
	encode_lockowner(xdr, lowner);
	hdr->nops++;
	hdr->replen += decode_release_lockowner_maxsz;
}

static void encode_lookup(struct xdr_stream *xdr, const struct qstr *name, struct compound_hdr *hdr)
{
	int len = name->len;
	__be32 *p;

	p = reserve_space(xdr, 8 + len);
	*p++ = cpu_to_be32(OP_LOOKUP);
	xdr_encode_opaque(p, name->name, len);
	hdr->nops++;
	hdr->replen += decode_lookup_maxsz;
}

static void encode_share_access(struct xdr_stream *xdr, fmode_t fmode)
{
	__be32 *p;

	p = reserve_space(xdr, 8);
	switch (fmode & (FMODE_READ|FMODE_WRITE)) {
	case FMODE_READ:
		*p++ = cpu_to_be32(NFS4_SHARE_ACCESS_READ);
		break;
	case FMODE_WRITE:
		*p++ = cpu_to_be32(NFS4_SHARE_ACCESS_WRITE);
		break;
	case FMODE_READ|FMODE_WRITE:
		*p++ = cpu_to_be32(NFS4_SHARE_ACCESS_BOTH);
		break;
	default:
		*p++ = cpu_to_be32(0);
	}
	*p = cpu_to_be32(0);		/* for linux, share_deny = 0 always */
}

static inline void encode_openhdr(struct xdr_stream *xdr, const struct nfs_openargs *arg)
{
	__be32 *p;
 /*
 * opcode 4, seqid 4, share_access 4, share_deny 4, clientid 8, ownerlen 4,
 * owner 4 = 32
 */
	p = reserve_space(xdr, 8);
	*p++ = cpu_to_be32(OP_OPEN);
	*p = cpu_to_be32(arg->seqid->sequence->counter);
	encode_share_access(xdr, arg->fmode);
	p = reserve_space(xdr, 32);
	p = xdr_encode_hyper(p, arg->clientid);
	*p++ = cpu_to_be32(20);
	p = xdr_encode_opaque_fixed(p, "open id:", 8);
	*p++ = cpu_to_be32(arg->server->s_dev);
	xdr_encode_hyper(p, arg->id);
}

static inline void encode_createmode(struct xdr_stream *xdr, const struct nfs_openargs *arg)
{
	__be32 *p;
	struct nfs_client *clp;

	p = reserve_space(xdr, 4);
	switch(arg->open_flags & O_EXCL) {
	case 0:
		*p = cpu_to_be32(NFS4_CREATE_UNCHECKED);
		encode_attrs(xdr, arg->u.attrs, arg->server);
		break;
	default:
		clp = arg->server->nfs_client;
		if (clp->cl_mvops->minor_version > 0) {
			if (nfs4_has_persistent_session(clp)) {
				*p = cpu_to_be32(NFS4_CREATE_GUARDED);
				encode_attrs(xdr, arg->u.attrs, arg->server);
			} else {
				struct iattr dummy;

				*p = cpu_to_be32(NFS4_CREATE_EXCLUSIVE4_1);
				encode_nfs4_verifier(xdr, &arg->u.verifier);
				dummy.ia_valid = 0;
				encode_attrs(xdr, &dummy, arg->server);
			}
		} else {
			*p = cpu_to_be32(NFS4_CREATE_EXCLUSIVE);
			encode_nfs4_verifier(xdr, &arg->u.verifier);
		}
	}
}

static void encode_opentype(struct xdr_stream *xdr, const struct nfs_openargs *arg)
{
	__be32 *p;

	p = reserve_space(xdr, 4);
	switch (arg->open_flags & O_CREAT) {
	case 0:
		*p = cpu_to_be32(NFS4_OPEN_NOCREATE);
		break;
	default:
		BUG_ON(arg->claim != NFS4_OPEN_CLAIM_NULL);
		*p = cpu_to_be32(NFS4_OPEN_CREATE);
		encode_createmode(xdr, arg);
	}
}

static inline void encode_delegation_type(struct xdr_stream *xdr, fmode_t delegation_type)
{
	__be32 *p;

	p = reserve_space(xdr, 4);
	switch (delegation_type) {
	case 0:
		*p = cpu_to_be32(NFS4_OPEN_DELEGATE_NONE);
		break;
	case FMODE_READ:
		*p = cpu_to_be32(NFS4_OPEN_DELEGATE_READ);
		break;
	case FMODE_WRITE|FMODE_READ:
		*p = cpu_to_be32(NFS4_OPEN_DELEGATE_WRITE);
		break;
	default:
		BUG();
	}
}

static inline void encode_claim_null(struct xdr_stream *xdr, const struct qstr *name)
{
	__be32 *p;

	p = reserve_space(xdr, 4);
	*p = cpu_to_be32(NFS4_OPEN_CLAIM_NULL);
	encode_string(xdr, name->len, name->name);
}

static inline void encode_claim_previous(struct xdr_stream *xdr, fmode_t type)
{
	__be32 *p;

	p = reserve_space(xdr, 4);
	*p = cpu_to_be32(NFS4_OPEN_CLAIM_PREVIOUS);
	encode_delegation_type(xdr, type);
}

static inline void encode_claim_delegate_cur(struct xdr_stream *xdr, const struct qstr *name, const nfs4_stateid *stateid)
{
	__be32 *p;

	p = reserve_space(xdr, 4+NFS4_STATEID_SIZE);
	*p++ = cpu_to_be32(NFS4_OPEN_CLAIM_DELEGATE_CUR);
	xdr_encode_opaque_fixed(p, stateid->data, NFS4_STATEID_SIZE);
	encode_string(xdr, name->len, name->name);
}

static void encode_open(struct xdr_stream *xdr, const struct nfs_openargs *arg, struct compound_hdr *hdr)
{
	encode_openhdr(xdr, arg);
	encode_opentype(xdr, arg);
	switch (arg->claim) {
	case NFS4_OPEN_CLAIM_NULL:
		encode_claim_null(xdr, arg->name);
		break;
	case NFS4_OPEN_CLAIM_PREVIOUS:
		encode_claim_previous(xdr, arg->u.delegation_type);
		break;
	case NFS4_OPEN_CLAIM_DELEGATE_CUR:
		encode_claim_delegate_cur(xdr, arg->name, &arg->u.delegation);
		break;
	default:
		BUG();
	}
	hdr->nops++;
	hdr->replen += decode_open_maxsz;
}

static void encode_open_confirm(struct xdr_stream *xdr, const struct nfs_open_confirmargs *arg, struct compound_hdr *hdr)
{
	__be32 *p;

	p = reserve_space(xdr, 4+NFS4_STATEID_SIZE+4);
	*p++ = cpu_to_be32(OP_OPEN_CONFIRM);
	p = xdr_encode_opaque_fixed(p, arg->stateid->data, NFS4_STATEID_SIZE);
	*p = cpu_to_be32(arg->seqid->sequence->counter);
	hdr->nops++;
	hdr->replen += decode_open_confirm_maxsz;
}

static void encode_open_downgrade(struct xdr_stream *xdr, const struct nfs_closeargs *arg, struct compound_hdr *hdr)
{
	__be32 *p;

	p = reserve_space(xdr, 4+NFS4_STATEID_SIZE+4);
	*p++ = cpu_to_be32(OP_OPEN_DOWNGRADE);
	p = xdr_encode_opaque_fixed(p, arg->stateid->data, NFS4_STATEID_SIZE);
	*p = cpu_to_be32(arg->seqid->sequence->counter);
	encode_share_access(xdr, arg->fmode);
	hdr->nops++;
	hdr->replen += decode_open_downgrade_maxsz;
}

static void
encode_putfh(struct xdr_stream *xdr, const struct nfs_fh *fh, struct compound_hdr *hdr)
{
	int len = fh->size;
	__be32 *p;

	p = reserve_space(xdr, 8 + len);
	*p++ = cpu_to_be32(OP_PUTFH);
	xdr_encode_opaque(p, fh->data, len);
	hdr->nops++;
	hdr->replen += decode_putfh_maxsz;
}

static void encode_putrootfh(struct xdr_stream *xdr, struct compound_hdr *hdr)
{
	__be32 *p;

	p = reserve_space(xdr, 4);
	*p = cpu_to_be32(OP_PUTROOTFH);
	hdr->nops++;
	hdr->replen += decode_putrootfh_maxsz;
}

static void encode_stateid(struct xdr_stream *xdr, const struct nfs_open_context *ctx, const struct nfs_lock_context *l_ctx, int zero_seqid)
{
	nfs4_stateid stateid;
	__be32 *p;

	p = reserve_space(xdr, NFS4_STATEID_SIZE);
	if (ctx->state != NULL) {
		nfs4_copy_stateid(&stateid, ctx->state, l_ctx->lockowner, l_ctx->pid);
		if (zero_seqid)
			stateid.stateid.seqid = 0;
		xdr_encode_opaque_fixed(p, stateid.data, NFS4_STATEID_SIZE);
	} else
		xdr_encode_opaque_fixed(p, zero_stateid.data, NFS4_STATEID_SIZE);
}

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

	p = reserve_space(xdr, 4);
	*p = cpu_to_be32(OP_READ);

	encode_stateid(xdr, args->context, args->lock_context,
		       hdr->minorversion);

	p = reserve_space(xdr, 12);
	p = xdr_encode_hyper(p, args->offset);
	*p = cpu_to_be32(args->count);
	hdr->nops++;
	hdr->replen += decode_read_maxsz;
}

static void encode_readdir(struct xdr_stream *xdr, const struct nfs4_readdir_arg *readdir, struct rpc_rqst *req, struct compound_hdr *hdr)
{
	uint32_t attrs[2] = {
		FATTR4_WORD0_RDATTR_ERROR,
		FATTR4_WORD1_MOUNTED_ON_FILEID,
	};
	uint32_t dircount = readdir->count >> 1;
	__be32 *p;

	if (readdir->plus) {
		attrs[0] |= FATTR4_WORD0_TYPE|FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE|
			FATTR4_WORD0_FSID|FATTR4_WORD0_FILEHANDLE|FATTR4_WORD0_FILEID;
		attrs[1] |= FATTR4_WORD1_MODE|FATTR4_WORD1_NUMLINKS|FATTR4_WORD1_OWNER|
			FATTR4_WORD1_OWNER_GROUP|FATTR4_WORD1_RAWDEV|
			FATTR4_WORD1_SPACE_USED|FATTR4_WORD1_TIME_ACCESS|
			FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
		dircount >>= 1;
	}
	/* Use mounted_on_fileid only if the server supports it */
	if (!(readdir->bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID))
		attrs[0] |= FATTR4_WORD0_FILEID;

	p = reserve_space(xdr, 12+NFS4_VERIFIER_SIZE+20);
	*p++ = cpu_to_be32(OP_READDIR);
	p = xdr_encode_hyper(p, readdir->cookie);
	p = xdr_encode_opaque_fixed(p, readdir->verifier.data, NFS4_VERIFIER_SIZE);
	*p++ = cpu_to_be32(dircount);
	*p++ = cpu_to_be32(readdir->count);
	*p++ = cpu_to_be32(2);

	*p++ = cpu_to_be32(attrs[0] & readdir->bitmask[0]);
	*p = cpu_to_be32(attrs[1] & readdir->bitmask[1]);
	hdr->nops++;
	hdr->replen += decode_readdir_maxsz;
	dprintk("%s: cookie = %Lu, verifier = %08x:%08x, bitmap = %08x:%08x\n",
			__func__,
			(unsigned long long)readdir->cookie,
			((u32 *)readdir->verifier.data)[0],
			((u32 *)readdir->verifier.data)[1],
			attrs[0] & readdir->bitmask[0],
			attrs[1] & readdir->bitmask[1]);
}

static void encode_readlink(struct xdr_stream *xdr, const struct nfs4_readlink *readlink, struct rpc_rqst *req, struct compound_hdr *hdr)
{
	__be32 *p;

	p = reserve_space(xdr, 4);
	*p = cpu_to_be32(OP_READLINK);
	hdr->nops++;
	hdr->replen += decode_readlink_maxsz;
}

static void encode_remove(struct xdr_stream *xdr, const struct qstr *name, struct compound_hdr *hdr)
{
	__be32 *p;

	p = reserve_space(xdr, 8 + name->len);
	*p++ = cpu_to_be32(OP_REMOVE);
	xdr_encode_opaque(p, name->name, name->len);
	hdr->nops++;
	hdr->replen += decode_remove_maxsz;
}

static void encode_rename(struct xdr_stream *xdr, const struct qstr *oldname, const struct qstr *newname, struct compound_hdr *hdr)
{
	__be32 *p;

	p = reserve_space(xdr, 4);
	*p = cpu_to_be32(OP_RENAME);
	encode_string(xdr, oldname->len, oldname->name);
	encode_string(xdr, newname->len, newname->name);
	hdr->nops++;
	hdr->replen += decode_rename_maxsz;
}

static void encode_renew(struct xdr_stream *xdr, clientid4 clid,
			 struct compound_hdr *hdr)
{
	__be32 *p;

	p = reserve_space(xdr, 12);
	*p++ = cpu_to_be32(OP_RENEW);
	xdr_encode_hyper(p, clid);
	hdr->nops++;
	hdr->replen += decode_renew_maxsz;
}

static void
encode_restorefh(struct xdr_stream *xdr, struct compound_hdr *hdr)
{
	__be32 *p;

	p = reserve_space(xdr, 4);
	*p = cpu_to_be32(OP_RESTOREFH);
	hdr->nops++;
	hdr->replen += decode_restorefh_maxsz;
}

static void
encode_setacl(struct xdr_stream *xdr, struct nfs_setaclargs *arg, struct compound_hdr *hdr)
{
	__be32 *p;

	p = reserve_space(xdr, 4+NFS4_STATEID_SIZE);
	*p++ = cpu_to_be32(OP_SETATTR);
	xdr_encode_opaque_fixed(p, zero_stateid.data, NFS4_STATEID_SIZE);
	p = reserve_space(xdr, 2*4);
	*p++ = cpu_to_be32(1);
	*p = cpu_to_be32(FATTR4_WORD0_ACL);
	BUG_ON(arg->acl_len % 4);
	p = reserve_space(xdr, 4);
	*p = cpu_to_be32(arg->acl_len);
	xdr_write_pages(xdr, arg->acl_pages, arg->acl_pgbase, arg->acl_len);
	hdr->nops++;
	hdr->replen += decode_setacl_maxsz;
}

static void
encode_savefh(struct xdr_stream *xdr, struct compound_hdr *hdr)
{
	__be32 *p;

	p = reserve_space(xdr, 4);
	*p = cpu_to_be32(OP_SAVEFH);
	hdr->nops++;
	hdr->replen += decode_savefh_maxsz;
}

static void encode_setattr(struct xdr_stream *xdr, const struct nfs_setattrargs *arg, const struct nfs_server *server, struct compound_hdr *hdr)
{
	__be32 *p;

	p = reserve_space(xdr, 4+NFS4_STATEID_SIZE);
	*p++ = cpu_to_be32(OP_SETATTR);
	xdr_encode_opaque_fixed(p, arg->stateid.data, NFS4_STATEID_SIZE);
	hdr->nops++;
	hdr->replen += decode_setattr_maxsz;
	encode_attrs(xdr, arg->iap, server);
}

static void encode_setclientid(struct xdr_stream *xdr, const struct nfs4_setclientid *setclientid, struct compound_hdr *hdr)
{
	__be32 *p;

	p = reserve_space(xdr, 4 + NFS4_VERIFIER_SIZE);
	*p++ = cpu_to_be32(OP_SETCLIENTID);
	xdr_encode_opaque_fixed(p, setclientid->sc_verifier->data, NFS4_VERIFIER_SIZE);

	encode_string(xdr, setclientid->sc_name_len, setclientid->sc_name);
	p = reserve_space(xdr, 4);
	*p = cpu_to_be32(setclientid->sc_prog);
	encode_string(xdr, setclientid->sc_netid_len, setclientid->sc_netid);
	encode_string(xdr, setclientid->sc_uaddr_len, setclientid->sc_uaddr);
	p = reserve_space(xdr, 4);
	*p = cpu_to_be32(setclientid->sc_cb_ident);
	hdr->nops++;
	hdr->replen += decode_setclientid_maxsz;
}

static void encode_setclientid_confirm(struct xdr_stream *xdr, const struct nfs4_setclientid_res *arg, struct compound_hdr *hdr)
{
	__be32 *p;

	p = reserve_space(xdr, 12 + NFS4_VERIFIER_SIZE);
	*p++ = cpu_to_be32(OP_SETCLIENTID_CONFIRM);
	p = xdr_encode_hyper(p, arg->clientid);
	xdr_encode_opaque_fixed(p, arg->confirm.data, NFS4_VERIFIER_SIZE);
	hdr->nops++;
	hdr->replen += decode_setclientid_confirm_maxsz;
}

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

	p = reserve_space(xdr, 4);
	*p = cpu_to_be32(OP_WRITE);

	encode_stateid(xdr, args->context, args->lock_context,
		       hdr->minorversion);

	p = reserve_space(xdr, 16);
	p = xdr_encode_hyper(p, args->offset);
	*p++ = cpu_to_be32(args->stable);
	*p = cpu_to_be32(args->count);

	xdr_write_pages(xdr, args->pages, args->pgbase, args->count);
	hdr->nops++;
	hdr->replen += decode_write_maxsz;
}

static void encode_delegreturn(struct xdr_stream *xdr, const nfs4_stateid *stateid, struct compound_hdr *hdr)
{
	__be32 *p;

	p = reserve_space(xdr, 4+NFS4_STATEID_SIZE);

	*p++ = cpu_to_be32(OP_DELEGRETURN);
	xdr_encode_opaque_fixed(p, stateid->data, NFS4_STATEID_SIZE);
	hdr->nops++;
	hdr->replen += decode_delegreturn_maxsz;
}

static void encode_secinfo(struct xdr_stream *xdr, const struct qstr *name, struct compound_hdr *hdr)
{
	int len = name->len;
	__be32 *p;

	p = reserve_space(xdr, 8 + len);
	*p++ = cpu_to_be32(OP_SECINFO);
	xdr_encode_opaque(p, name->name, len);
	hdr->nops++;
	hdr->replen += decode_secinfo_maxsz;
}

#if defined(CONFIG_NFS_V4_1)
/* NFSv4.1 operations */
static void encode_exchange_id(struct xdr_stream *xdr,
			       struct nfs41_exchange_id_args *args,
			       struct compound_hdr *hdr)
{
	__be32 *p;
	char impl_name[NFS4_OPAQUE_LIMIT];
	int len = 0;

	p = reserve_space(xdr, 4 + sizeof(args->verifier->data));
	*p++ = cpu_to_be32(OP_EXCHANGE_ID);
	xdr_encode_opaque_fixed(p, args->verifier->data, sizeof(args->verifier->data));

	encode_string(xdr, args->id_len, args->id);

	p = reserve_space(xdr, 12);
	*p++ = cpu_to_be32(args->flags);
	*p++ = cpu_to_be32(0);	/* zero length state_protect4_a */

	if (send_implementation_id &&
	    sizeof(CONFIG_NFS_V4_1_IMPLEMENTATION_ID_DOMAIN) > 1 &&
	    sizeof(CONFIG_NFS_V4_1_IMPLEMENTATION_ID_DOMAIN)
		<= NFS4_OPAQUE_LIMIT + 1)
		len = snprintf(impl_name, sizeof(impl_name), "%s %s %s %s",
			       utsname()->sysname, utsname()->release,
			       utsname()->version, utsname()->machine);

	if (len > 0) {
		*p = cpu_to_be32(1);	/* implementation id array length=1 */

		encode_string(xdr,
			sizeof(CONFIG_NFS_V4_1_IMPLEMENTATION_ID_DOMAIN) - 1,
			CONFIG_NFS_V4_1_IMPLEMENTATION_ID_DOMAIN);
		encode_string(xdr, len, impl_name);
		/* just send zeros for nii_date - the date is in nii_name */
		p = reserve_space(xdr, 12);
		p = xdr_encode_hyper(p, 0);
		*p = cpu_to_be32(0);
	} else
		*p = cpu_to_be32(0);	/* implementation id array length=0 */

	hdr->nops++;
	hdr->replen += decode_exchange_id_maxsz;
}

static void encode_create_session(struct xdr_stream *xdr,
				  struct nfs41_create_session_args *args,
				  struct compound_hdr *hdr)
{
	__be32 *p;
	char machine_name[NFS4_MAX_MACHINE_NAME_LEN];
	uint32_t len;
	struct nfs_client *clp = args->client;
	u32 max_resp_sz_cached;

	/*
	 * Assumes OPEN is the biggest non-idempotent compound.
	 * 2 is the verifier.
	 */
	max_resp_sz_cached = (NFS4_dec_open_sz + RPC_REPHDRSIZE +
			      RPC_MAX_AUTH_SIZE + 2) * XDR_UNIT;

	len = scnprintf(machine_name, sizeof(machine_name), "%s",
			clp->cl_ipaddr);

	p = reserve_space(xdr, 20 + 2*28 + 20 + len + 12);
	*p++ = cpu_to_be32(OP_CREATE_SESSION);
	p = xdr_encode_hyper(p, clp->cl_clientid);
	*p++ = cpu_to_be32(clp->cl_seqid);			/*Sequence id */
	*p++ = cpu_to_be32(args->flags);			/*flags */

	/* Fore Channel */
	*p++ = cpu_to_be32(0);				/* header padding size */
	*p++ = cpu_to_be32(args->fc_attrs.max_rqst_sz);	/* max req size */
	*p++ = cpu_to_be32(args->fc_attrs.max_resp_sz);	/* max resp size */
	*p++ = cpu_to_be32(max_resp_sz_cached);		/* Max resp sz cached */
	*p++ = cpu_to_be32(args->fc_attrs.max_ops);	/* max operations */
	*p++ = cpu_to_be32(args->fc_attrs.max_reqs);	/* max requests */
	*p++ = cpu_to_be32(0);				/* rdmachannel_attrs */

	/* Back Channel */
	*p++ = cpu_to_be32(0);				/* header padding size */
	*p++ = cpu_to_be32(args->bc_attrs.max_rqst_sz);	/* max req size */
	*p++ = cpu_to_be32(args->bc_attrs.max_resp_sz);	/* max resp size */
	*p++ = cpu_to_be32(args->bc_attrs.max_resp_sz_cached);	/* Max resp sz cached */
	*p++ = cpu_to_be32(args->bc_attrs.max_ops);	/* max operations */
	*p++ = cpu_to_be32(args->bc_attrs.max_reqs);	/* max requests */
	*p++ = cpu_to_be32(0);				/* rdmachannel_attrs */

	*p++ = cpu_to_be32(args->cb_program);		/* cb_program */
	*p++ = cpu_to_be32(1);
	*p++ = cpu_to_be32(RPC_AUTH_UNIX);			/* auth_sys */

	/* authsys_parms rfc1831 */
	*p++ = cpu_to_be32((u32)clp->cl_boot_time.tv_nsec);	/* stamp */
	p = xdr_encode_opaque(p, machine_name, len);
	*p++ = cpu_to_be32(0);				/* UID */
	*p++ = cpu_to_be32(0);				/* GID */
	*p = cpu_to_be32(0);				/* No more gids */
	hdr->nops++;
	hdr->replen += decode_create_session_maxsz;
}

static void encode_destroy_session(struct xdr_stream *xdr,
				   struct nfs4_session *session,
				   struct compound_hdr *hdr)
{
	__be32 *p;
	p = reserve_space(xdr, 4 + NFS4_MAX_SESSIONID_LEN);
	*p++ = cpu_to_be32(OP_DESTROY_SESSION);
	xdr_encode_opaque_fixed(p, session->sess_id.data, NFS4_MAX_SESSIONID_LEN);
	hdr->nops++;
	hdr->replen += decode_destroy_session_maxsz;
}

static void encode_reclaim_complete(struct xdr_stream *xdr,
				    struct nfs41_reclaim_complete_args *args,
				    struct compound_hdr *hdr)
{
	__be32 *p;

	p = reserve_space(xdr, 8);
	*p++ = cpu_to_be32(OP_RECLAIM_COMPLETE);
	*p++ = cpu_to_be32(args->one_fs);
	hdr->nops++;
	hdr->replen += decode_reclaim_complete_maxsz;
}
#endif /* CONFIG_NFS_V4_1 */

static void encode_sequence(struct xdr_stream *xdr,
			    const struct nfs4_sequence_args *args,
			    struct compound_hdr *hdr)
{
#if defined(CONFIG_NFS_V4_1)
	struct nfs4_session *session = args->sa_session;
	struct nfs4_slot_table *tp;
	struct nfs4_slot *slot;
	__be32 *p;

	if (!session)
		return;

	tp = &session->fc_slot_table;

	WARN_ON(args->sa_slotid == NFS4_MAX_SLOT_TABLE);
	slot = tp->slots + args->sa_slotid;

	p = reserve_space(xdr, 4 + NFS4_MAX_SESSIONID_LEN + 16);
	*p++ = cpu_to_be32(OP_SEQUENCE);

	/*
	 * Sessionid + seqid + slotid + max slotid + cache_this
	 */
	dprintk("%s: sessionid=%u:%u:%u:%u seqid=%d slotid=%d "
		"max_slotid=%d cache_this=%d\n",
		__func__,
		((u32 *)session->sess_id.data)[0],
		((u32 *)session->sess_id.data)[1],
		((u32 *)session->sess_id.data)[2],
		((u32 *)session->sess_id.data)[3],
		slot->seq_nr, args->sa_slotid,
		tp->highest_used_slotid, args->sa_cache_this);
	p = xdr_encode_opaque_fixed(p, session->sess_id.data, NFS4_MAX_SESSIONID_LEN);
	*p++ = cpu_to_be32(slot->seq_nr);
	*p++ = cpu_to_be32(args->sa_slotid);
	*p++ = cpu_to_be32(tp->highest_used_slotid);
	*p = cpu_to_be32(args->sa_cache_this);
	hdr->nops++;
	hdr->replen += decode_sequence_maxsz;
#endif /* CONFIG_NFS_V4_1 */
}

#ifdef CONFIG_NFS_V4_1
static void
encode_getdevicelist(struct xdr_stream *xdr,
		     const struct nfs4_getdevicelist_args *args,
		     struct compound_hdr *hdr)
{
	__be32 *p;
	nfs4_verifier dummy = {
		.data = "dummmmmy",
	};

	p = reserve_space(xdr, 20);
	*p++ = cpu_to_be32(OP_GETDEVICELIST);
	*p++ = cpu_to_be32(args->layoutclass);
	*p++ = cpu_to_be32(NFS4_PNFS_GETDEVLIST_MAXNUM);
	xdr_encode_hyper(p, 0ULL);                          /* cookie */
	encode_nfs4_verifier(xdr, &dummy);
	hdr->nops++;
	hdr->replen += decode_getdevicelist_maxsz;
}

static void
encode_getdeviceinfo(struct xdr_stream *xdr,
		     const struct nfs4_getdeviceinfo_args *args,
		     struct compound_hdr *hdr)
{
	__be32 *p;

	p = reserve_space(xdr, 16 + NFS4_DEVICEID4_SIZE);
	*p++ = cpu_to_be32(OP_GETDEVICEINFO);
	p = xdr_encode_opaque_fixed(p, args->pdev->dev_id.data,
				    NFS4_DEVICEID4_SIZE);
	*p++ = cpu_to_be32(args->pdev->layout_type);
	*p++ = cpu_to_be32(args->pdev->pglen);		/* gdia_maxcount */
	*p++ = cpu_to_be32(0);				/* bitmap length 0 */
	hdr->nops++;
	hdr->replen += decode_getdeviceinfo_maxsz;
}

static void
encode_layoutget(struct xdr_stream *xdr,
		      const struct nfs4_layoutget_args *args,
		      struct compound_hdr *hdr)
{
	__be32 *p;

	p = reserve_space(xdr, 44 + NFS4_STATEID_SIZE);
	*p++ = cpu_to_be32(OP_LAYOUTGET);
	*p++ = cpu_to_be32(0);     /* Signal layout available */