nfs4xdr.c

			dprintk("nfs: couldn't resolve uid %d to string\n",
					iap->ia_uid);
			/* XXX */
			strcpy(owner_name, "nobody");
			owner_namelen = sizeof("nobody") - 1;
			/* goto out; */
		}
		len += 4 + (XDR_QUADLEN(owner_namelen) << 2);
	}
	if (iap->ia_valid & ATTR_GID) {
		owner_grouplen = nfs_map_gid_to_group(server, iap->ia_gid, owner_group, IDMAP_NAMESZ);
		if (owner_grouplen < 0) {
			dprintk("nfs: couldn't resolve gid %d to string\n",
					iap->ia_gid);
			strcpy(owner_group, "nobody");
			owner_grouplen = sizeof("nobody") - 1;
			/* goto out; */
		}
		len += 4 + (XDR_QUADLEN(owner_grouplen) << 2);
	}
	if (iap->ia_valid & ATTR_ATIME_SET)
		len += 16;
	else if (iap->ia_valid & ATTR_ATIME)
		len += 4;
	if (iap->ia_valid & ATTR_MTIME_SET)
		len += 16;
	else if (iap->ia_valid & ATTR_MTIME)
		len += 4;
	p = reserve_space(xdr, len);

	/*
	 * We write the bitmap length now, but leave the bitmap and the attribute
	 * buffer length to be backfilled at the end of this routine.
	 */
	*p++ = cpu_to_be32(2);
	q = p;
	p += 3;

	if (iap->ia_valid & ATTR_SIZE) {
		bmval0 |= FATTR4_WORD0_SIZE;
		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)
{
	encode_op_hdr(xdr, OP_ACCESS, decode_access_maxsz, hdr);
	encode_uint32(xdr, access);
}

static void encode_close(struct xdr_stream *xdr, const struct nfs_closeargs *arg, struct compound_hdr *hdr)
{
	encode_op_hdr(xdr, OP_CLOSE, decode_close_maxsz, hdr);
	encode_nfs4_seqid(xdr, arg->seqid);
	encode_nfs4_stateid(xdr, arg->stateid);
}

static void encode_commit(struct xdr_stream *xdr, const struct nfs_commitargs *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->offset);
	*p = cpu_to_be32(args->count);
}

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

	encode_op_hdr(xdr, OP_CREATE, decode_create_maxsz, hdr);
	encode_uint32(xdr, 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);
	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;

	encode_op_hdr(xdr, OP_GETATTR, decode_getattr_maxsz, hdr);
	p = reserve_space(xdr, 8);
	*p++ = cpu_to_be32(1);
	*p = cpu_to_be32(bitmap);
}

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

	encode_op_hdr(xdr, OP_GETATTR, decode_getattr_maxsz, hdr);
	p = reserve_space(xdr, 12);
	*p++ = cpu_to_be32(2);
	*p++ = cpu_to_be32(bm0);
	*p = cpu_to_be32(bm1);
}

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

	encode_op_hdr(xdr, OP_GETATTR, decode_getattr_maxsz, hdr);
	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);
	}
}

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_getfattr_open(struct xdr_stream *xdr, const u32 *bitmask,
				 const u32 *open_bitmap,
				 struct compound_hdr *hdr)
{
	encode_getattr_three(xdr,
			     bitmask[0] & open_bitmap[0],
			     bitmask[1] & open_bitmap[1],
			     bitmask[2] & open_bitmap[2],
			     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)
{
	encode_op_hdr(xdr, OP_GETFH, decode_getfh_maxsz, hdr);
}

static void encode_link(struct xdr_stream *xdr, const struct qstr *name, struct compound_hdr *hdr)
{
	encode_op_hdr(xdr, OP_LINK, decode_link_maxsz, hdr);
	encode_string(xdr, name->len, name->name);
}

static inline int nfs4_lock_type(struct file_lock *fl, int block)
{
	if (fl->fl_type == 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;

	encode_op_hdr(xdr, OP_LOCK, decode_lock_maxsz, hdr);
	p = reserve_space(xdr, 28);
	*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){
		encode_nfs4_seqid(xdr, args->open_seqid);
		encode_nfs4_stateid(xdr, args->open_stateid);
		encode_nfs4_seqid(xdr, args->lock_seqid);
		encode_lockowner(xdr, &args->lock_owner);
	}
	else {
		encode_nfs4_stateid(xdr, args->lock_stateid);
		encode_nfs4_seqid(xdr, args->lock_seqid);
	}
}

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

	encode_op_hdr(xdr, OP_LOCKT, decode_lockt_maxsz, hdr);
	p = reserve_space(xdr, 20);
	*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);
}

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

	encode_op_hdr(xdr, OP_LOCKU, decode_locku_maxsz, hdr);
	encode_uint32(xdr, nfs4_lock_type(args->fl, 0));
	encode_nfs4_seqid(xdr, args->seqid);
	encode_nfs4_stateid(xdr, args->stateid);
	p = reserve_space(xdr, 16);
	p = xdr_encode_hyper(p, args->fl->fl_start);
	xdr_encode_hyper(p, nfs4_lock_length(args->fl));
}

static void encode_release_lockowner(struct xdr_stream *xdr, const struct nfs_lowner *lowner, struct compound_hdr *hdr)
{
	encode_op_hdr(xdr, OP_RELEASE_LOCKOWNER, decode_release_lockowner_maxsz, hdr);
	encode_lockowner(xdr, lowner);
}

static void encode_lookup(struct xdr_stream *xdr, const struct qstr *name, struct compound_hdr *hdr)
{
	encode_op_hdr(xdr, OP_LOOKUP, decode_lookup_maxsz, hdr);
	encode_string(xdr, name->len, name->name);
}

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
 */
	encode_nfs4_seqid(xdr, arg->seqid);
	encode_share_access(xdr, arg->fmode);
	p = reserve_space(xdr, 36);
	p = xdr_encode_hyper(p, arg->clientid);
	*p++ = cpu_to_be32(24);
	p = xdr_encode_opaque_fixed(p, "open id:", 8);
	*p++ = cpu_to_be32(arg->server->s_dev);
	*p++ = cpu_to_be32(arg->id.uniquifier);
	xdr_encode_hyper(p, arg->id.create_time);
}

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);
	*p = cpu_to_be32(NFS4_OPEN_CLAIM_DELEGATE_CUR);
	encode_nfs4_stateid(xdr, stateid);
	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_op_hdr(xdr, OP_OPEN, decode_open_maxsz, 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();
	}
}

static void encode_open_confirm(struct xdr_stream *xdr, const struct nfs_open_confirmargs *arg, struct compound_hdr *hdr)
{
	encode_op_hdr(xdr, OP_OPEN_CONFIRM, decode_open_confirm_maxsz, hdr);
	encode_nfs4_stateid(xdr, arg->stateid);
	encode_nfs4_seqid(xdr, arg->seqid);
}

static void encode_open_downgrade(struct xdr_stream *xdr, const struct nfs_closeargs *arg, struct compound_hdr *hdr)
{
	encode_op_hdr(xdr, OP_OPEN_DOWNGRADE, decode_open_downgrade_maxsz, hdr);
	encode_nfs4_stateid(xdr, arg->stateid);
	encode_nfs4_seqid(xdr, arg->seqid);
	encode_share_access(xdr, arg->fmode);
}

static void
encode_putfh(struct xdr_stream *xdr, const struct nfs_fh *fh, struct compound_hdr *hdr)
{
	encode_op_hdr(xdr, OP_PUTFH, decode_putfh_maxsz, hdr);
	encode_string(xdr, fh->size, fh->data);
}

static void encode_putrootfh(struct xdr_stream *xdr, struct compound_hdr *hdr)
{
	encode_op_hdr(xdr, OP_PUTROOTFH, decode_putrootfh_maxsz, hdr);
}

static void encode_open_stateid(struct xdr_stream *xdr,
		const struct nfs_open_context *ctx,
		const struct nfs_lock_context *l_ctx,
		fmode_t fmode,
		int zero_seqid)
{
	nfs4_stateid stateid;

	if (ctx->state != NULL) {
		const struct nfs_lockowner *lockowner = NULL;

		if (l_ctx != NULL)
			lockowner = &l_ctx->lockowner;
		nfs4_select_rw_stateid(&stateid, ctx->state,
				fmode, lockowner);
		if (zero_seqid)
			stateid.seqid = 0;
		encode_nfs4_stateid(xdr, &stateid);
	} else
		encode_nfs4_stateid(xdr, &zero_stateid);
}

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

	encode_op_hdr(xdr, OP_READ, decode_read_maxsz, hdr);
	encode_open_stateid(xdr, args->context, args->lock_context,
			FMODE_READ, hdr->minorversion);

	p = reserve_space(xdr, 12);
	p = xdr_encode_hyper(p, args->offset);
	*p = cpu_to_be32(args->count);
}

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, verf[2];

	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;

	encode_op_hdr(xdr, OP_READDIR, decode_readdir_maxsz, hdr);
	encode_uint64(xdr, readdir->cookie);
	encode_nfs4_verifier(xdr, &readdir->verifier);
	p = reserve_space(xdr, 20);
	*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]);
	memcpy(verf, readdir->verifier.data, sizeof(verf));
	dprintk("%s: cookie = %Lu, verifier = %08x:%08x, bitmap = %08x:%08x\n",
			__func__,
			(unsigned long long)readdir->cookie,
			verf[0], verf[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)
{
	encode_op_hdr(xdr, OP_READLINK, decode_readlink_maxsz, hdr);
}

static void encode_remove(struct xdr_stream *xdr, const struct qstr *name, struct compound_hdr *hdr)
{
	encode_op_hdr(xdr, OP_REMOVE, decode_remove_maxsz, hdr);
	encode_string(xdr, name->len, name->name);
}

static void encode_rename(struct xdr_stream *xdr, const struct qstr *oldname, const struct qstr *newname, struct compound_hdr *hdr)
{
	encode_op_hdr(xdr, OP_RENAME, decode_rename_maxsz, hdr);
	encode_string(xdr, oldname->len, oldname->name);
	encode_string(xdr, newname->len, newname->name);
}

static void encode_renew(struct xdr_stream *xdr, clientid4 clid,
			 struct compound_hdr *hdr)
{
	encode_op_hdr(xdr, OP_RENEW, decode_renew_maxsz, hdr);
	encode_uint64(xdr, clid);
}

static void
encode_restorefh(struct xdr_stream *xdr, struct compound_hdr *hdr)
{
	encode_op_hdr(xdr, OP_RESTOREFH, decode_restorefh_maxsz, hdr);
}

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

	encode_op_hdr(xdr, OP_SETATTR, decode_setacl_maxsz, hdr);
	encode_nfs4_stateid(xdr, &zero_stateid);
	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);
}

static void
encode_savefh(struct xdr_stream *xdr, struct compound_hdr *hdr)
{
	encode_op_hdr(xdr, OP_SAVEFH, decode_savefh_maxsz, hdr);
}

static void encode_setattr(struct xdr_stream *xdr, const struct nfs_setattrargs *arg, const struct nfs_server *server, struct compound_hdr *hdr)
{
	encode_op_hdr(xdr, OP_SETATTR, decode_setattr_maxsz, hdr);
	encode_nfs4_stateid(xdr, &arg->stateid);
	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;

	encode_op_hdr(xdr, OP_SETCLIENTID, decode_setclientid_maxsz, hdr);
	encode_nfs4_verifier(xdr, setclientid->sc_verifier);

	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);
}

static void encode_setclientid_confirm(struct xdr_stream *xdr, const struct nfs4_setclientid_res *arg, struct compound_hdr *hdr)
{
	encode_op_hdr(xdr, OP_SETCLIENTID_CONFIRM,
			decode_setclientid_confirm_maxsz, hdr);
	encode_uint64(xdr, arg->clientid);
	encode_nfs4_verifier(xdr, &arg->confirm);
}

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

	encode_op_hdr(xdr, OP_WRITE, decode_write_maxsz, hdr);
	encode_open_stateid(xdr, args->context, args->lock_context,
			FMODE_WRITE, 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);
}

static void encode_delegreturn(struct xdr_stream *xdr, const nfs4_stateid *stateid, struct compound_hdr *hdr)
{
	encode_op_hdr(xdr, OP_DELEGRETURN, decode_delegreturn_maxsz, hdr);
	encode_nfs4_stateid(xdr, stateid);
}

static void encode_secinfo(struct xdr_stream *xdr, const struct qstr *name, struct compound_hdr *hdr)
{
	encode_op_hdr(xdr, OP_SECINFO, decode_secinfo_maxsz, hdr);
	encode_string(xdr, name->len, name->name);
}

#if defined(CONFIG_NFS_V4_1)
/* NFSv4.1 operations */
static void encode_bind_conn_to_session(struct xdr_stream *xdr,
				   struct nfs4_session *session,
				   struct compound_hdr *hdr)
{
	__be32 *p;

	encode_op_hdr(xdr, OP_BIND_CONN_TO_SESSION,
		decode_bind_conn_to_session_maxsz, hdr);
	encode_opaque_fixed(xdr, session->sess_id.data, NFS4_MAX_SESSIONID_LEN);
	p = xdr_reserve_space(xdr, 8);
	*p++ = cpu_to_be32(NFS4_CDFC4_BACK_OR_BOTH);
	*p = 0;	/* use_conn_in_rdma_mode = False */
}

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;

	encode_op_hdr(xdr, OP_EXCHANGE_ID, decode_exchange_id_maxsz, hdr);
	encode_nfs4_verifier(xdr, args->verifier);

	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 */
}

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;
	struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
	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);

	encode_op_hdr(xdr, OP_CREATE_SESSION, decode_create_session_maxsz, hdr);
	p = reserve_space(xdr, 16 + 2*28 + 20 + len + 12);
	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++ = (__be32)nn->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 */
}

static void encode_destroy_session(struct xdr_stream *xdr,
				   struct nfs4_session *session,
				   struct compound_hdr *hdr)
{
	encode_op_hdr(xdr, OP_DESTROY_SESSION, decode_destroy_session_maxsz, hdr);
	encode_opaque_fixed(xdr, session->sess_id.data, NFS4_MAX_SESSIONID_LEN);
}

static void encode_destroy_clientid(struct xdr_stream *xdr,
				   uint64_t clientid,
				   struct compound_hdr *hdr)
{
	encode_op_hdr(xdr, OP_DESTROY_CLIENTID, decode_destroy_clientid_maxsz, hdr);
	encode_uint64(xdr, clientid);
}

static void encode_reclaim_complete(struct xdr_stream *xdr,
				    struct nfs41_reclaim_complete_args *args,
				    struct compound_hdr *hdr)
{
	encode_op_hdr(xdr, OP_RECLAIM_COMPLETE, decode_reclaim_complete_maxsz, hdr);
	encode_uint32(xdr, args->one_fs);
}
#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;

	encode_op_hdr(xdr, OP_SEQUENCE, decode_sequence_maxsz, hdr);

	/*
	 * 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 = reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 16);
	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);
#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",
	};

	encode_op_hdr(xdr, OP_GETDEVICELIST, decode_getdevicelist_maxsz, hdr);
	p = reserve_space(xdr, 16);
	*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);
}

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

	encode_op_hdr(xdr, OP_GETDEVICEINFO, decode_getdeviceinfo_maxsz, hdr);
	p = reserve_space(xdr, 12 + NFS4_DEVICEID4_SIZE);
	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 */
}

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

	encode_op_hdr(xdr, OP_LAYOUTGET, decode_layoutget_maxsz, hdr);
	p = reserve_space(xdr, 36);
	*p++ = cpu_to_be32(0);     /* Signal layout available */
	*p++ = cpu_to_be32(args->type);
	*p++ = cpu_to_be32(args->range.iomode);
	p = xdr_encode_hyper(p, args->range.offset);
	p = xdr_encode_hyper(p, args->range.length);
	p = xdr_encode_hyper(p, args->minlength);
	encode_nfs4_stateid(xdr, &args->stateid);
	encode_uint32(xdr, args->maxcount);

	dprintk("%s: 1st type:0x%x iomode:%d off:%lu len:%lu mc:%d\n",
		__func__,
		args->type,
		args->range.iomode,
		(unsigned long)args->range.offset,
		(unsigned long)args->range.length,
		args->maxcount);
}

static int
encode_layoutcommit(struct xdr_stream *xdr,
		    struct inode *inode,
		    const struct nfs4_layoutcommit_args *args,
		    struct compound_hdr *hdr)
{
	__be32 *p;

	dprintk("%s: lbw: %llu type: %d\n", __func__, args->lastbytewritten,
		NFS_SERVER(args->inode)->pnfs_curr_ld->id);

	encode_op_hdr(xdr, OP_LAYOUTCOMMIT, decode_layoutcommit_maxsz, hdr);
	p = reserve_space(xdr, 20);
	/* Only whole file layouts */
	p = xdr_encode_hyper(p, 0); /* offset */
	p = xdr_encode_hyper(p, args->lastbytewritten + 1);	/* length */
	*p = cpu_to_be32(0); /* reclaim */
	encode_nfs4_stateid(xdr, &args->stateid);
	p = reserve_space(xdr, 20);
	*p++ = cpu_to_be32(1); /* newoffset = TRUE */
	p = xdr_encode_hyper(p, args->lastbytewritten);
	*p++ = cpu_to_be32(0); /* Never send time_modify_changed */
	*p++ = cpu_to_be32(NFS_SERVER(args->inode)->pnfs_curr_ld->id);/* type */

	if (NFS_SERVER(inode)->pnfs_curr_ld->encode_layoutcommit)
		NFS_SERVER(inode)->pnfs_curr_ld->encode_layoutcommit(
			NFS_I(inode)->layout, xdr, args);
	else
		encode_uint32(xdr, 0); /* no layout-type payload */

	return 0;
}

static void
encode_layoutreturn(struct xdr_stream *xdr,
		    const struct nfs4_layoutreturn_args *args,
		    struct compound_hdr *hdr)
{
	__be32 *p;

	encode_op_hdr(xdr, OP_LAYOUTRETURN, decode_layoutreturn_maxsz, hdr);
	p = reserve_space(xdr, 16);
	*p++ = cpu_to_be32(0);		/* reclaim. always 0 for now */
	*p++ = cpu_to_be32(args->layout_type);
	*p++ = cpu_to_be32(IOMODE_ANY);
	*p = cpu_to_be32(RETURN_FILE);
	p = reserve_space(xdr, 16);
	p = xdr_encode_hyper(p, 0);
	p = xdr_encode_hyper(p, NFS4_MAX_UINT64);
	spin_lock(&args->inode->i_lock);
	encode_nfs4_stateid(xdr, &args->stateid);
	spin_unlock(&args->inode->i_lock);
	if (NFS_SERVER(args->inode)->pnfs_curr_ld->encode_layoutreturn) {
		NFS_SERVER(args->inode)->pnfs_curr_ld->encode_layoutreturn(
			NFS_I(args->inode)->layout, xdr, args);
	} else
		encode_uint32(xdr, 0);
}

static int
encode_secinfo_no_name(struct xdr_stream *xdr,
		       const struct nfs41_secinfo_no_name_args *args,
		       struct compound_hdr *hdr)
{
	encode_op_hdr(xdr, OP_SECINFO_NO_NAME, decode_secinfo_no_name_maxsz, hdr);