nfs4xdr.c

	if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
		goto xdr_error;

	if ((status = decode_attr_maxlink(xdr, bitmap, &pathconf->max_link)) != 0)
		goto xdr_error;
	if ((status = decode_attr_maxname(xdr, bitmap, &pathconf->max_namelen)) != 0)
		goto xdr_error;

	status = verify_attr_len(xdr, savep, attrlen);
xdr_error:
	dprintk("%s: xdr returned %d!\n", __FUNCTION__, -status);
	return status;
}

static int decode_getfattr(struct xdr_stream *xdr, struct nfs_fattr *fattr, const struct nfs_server *server)
{
	__be32 *savep;
	uint32_t attrlen,
		 bitmap[2] = {0},
		 type;
	int status, fmode = 0;
	uint64_t fileid;

	if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
		goto xdr_error;
	if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
		goto xdr_error;

	fattr->bitmap[0] = bitmap[0];
	fattr->bitmap[1] = bitmap[1];

	if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
		goto xdr_error;


	if ((status = decode_attr_type(xdr, bitmap, &type)) != 0)
		goto xdr_error;
	fattr->type = nfs_type2fmt[type].nfs2type;
	fmode = nfs_type2fmt[type].mode;

	if ((status = decode_attr_change(xdr, bitmap, &fattr->change_attr)) != 0)
		goto xdr_error;
	if ((status = decode_attr_size(xdr, bitmap, &fattr->size)) != 0)
		goto xdr_error;
	if ((status = decode_attr_fsid(xdr, bitmap, &fattr->fsid)) != 0)
		goto xdr_error;
	if ((status = decode_attr_fileid(xdr, bitmap, &fattr->fileid)) != 0)
		goto xdr_error;
	if ((status = decode_attr_fs_locations(xdr, bitmap, container_of(fattr,
						struct nfs4_fs_locations,
						fattr))) != 0)
		goto xdr_error;
	if ((status = decode_attr_mode(xdr, bitmap, &fattr->mode)) != 0)
		goto xdr_error;
	fattr->mode |= fmode;
	if ((status = decode_attr_nlink(xdr, bitmap, &fattr->nlink)) != 0)
		goto xdr_error;
	if ((status = decode_attr_owner(xdr, bitmap, server->nfs_client, &fattr->uid)) != 0)
		goto xdr_error;
	if ((status = decode_attr_group(xdr, bitmap, server->nfs_client, &fattr->gid)) != 0)
		goto xdr_error;
	if ((status = decode_attr_rdev(xdr, bitmap, &fattr->rdev)) != 0)
		goto xdr_error;
	if ((status = decode_attr_space_used(xdr, bitmap, &fattr->du.nfs3.used)) != 0)
		goto xdr_error;
	if ((status = decode_attr_time_access(xdr, bitmap, &fattr->atime)) != 0)
		goto xdr_error;
	if ((status = decode_attr_time_metadata(xdr, bitmap, &fattr->ctime)) != 0)
		goto xdr_error;
	if ((status = decode_attr_time_modify(xdr, bitmap, &fattr->mtime)) != 0)
		goto xdr_error;
	if ((status = decode_attr_mounted_on_fileid(xdr, bitmap, &fileid)) != 0)
		goto xdr_error;
	if (fattr->fileid == 0 && fileid != 0)
		fattr->fileid = fileid;
	if ((status = verify_attr_len(xdr, savep, attrlen)) == 0)
		fattr->valid = NFS_ATTR_FATTR | NFS_ATTR_FATTR_V3 | NFS_ATTR_FATTR_V4;
xdr_error:
	dprintk("%s: xdr returned %d\n", __FUNCTION__, -status);
	return status;
}


static int decode_fsinfo(struct xdr_stream *xdr, struct nfs_fsinfo *fsinfo)
{
	__be32 *savep;
	uint32_t attrlen, bitmap[2];
	int status;

	if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
		goto xdr_error;
	if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
		goto xdr_error;
	if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
		goto xdr_error;

	fsinfo->rtmult = fsinfo->wtmult = 512;	/* ??? */

	if ((status = decode_attr_lease_time(xdr, bitmap, &fsinfo->lease_time)) != 0)
		goto xdr_error;
	if ((status = decode_attr_maxfilesize(xdr, bitmap, &fsinfo->maxfilesize)) != 0)
		goto xdr_error;
	if ((status = decode_attr_maxread(xdr, bitmap, &fsinfo->rtmax)) != 0)
		goto xdr_error;
	fsinfo->rtpref = fsinfo->dtpref = fsinfo->rtmax;
	if ((status = decode_attr_maxwrite(xdr, bitmap, &fsinfo->wtmax)) != 0)
		goto xdr_error;
	fsinfo->wtpref = fsinfo->wtmax;

	status = verify_attr_len(xdr, savep, attrlen);
xdr_error:
	dprintk("%s: xdr returned %d!\n", __FUNCTION__, -status);
	return status;
}

static int decode_getfh(struct xdr_stream *xdr, struct nfs_fh *fh)
{
	__be32 *p;
	uint32_t len;
	int status;

	status = decode_op_hdr(xdr, OP_GETFH);
	if (status)
		return status;
	/* Zero handle first to allow comparisons */
	memset(fh, 0, sizeof(*fh));

	READ_BUF(4);
	READ32(len);
	if (len > NFS4_FHSIZE)
		return -EIO;
	fh->size = len;
	READ_BUF(len);
	COPYMEM(fh->data, len);
	return 0;
}

static int decode_link(struct xdr_stream *xdr, struct nfs4_change_info *cinfo)
{
	int status;
	
	status = decode_op_hdr(xdr, OP_LINK);
	if (status)
		return status;
	return decode_change_info(xdr, cinfo);
}

/*
 * We create the owner, so we know a proper owner.id length is 4.
 */
static int decode_lock_denied (struct xdr_stream *xdr, struct file_lock *fl)
{
	uint64_t offset, length, clientid;
	__be32 *p;
	uint32_t namelen, type;

	READ_BUF(32);
	READ64(offset);
	READ64(length);
	READ32(type);
	if (fl != NULL) {
		fl->fl_start = (loff_t)offset;
		fl->fl_end = fl->fl_start + (loff_t)length - 1;
		if (length == ~(uint64_t)0)
			fl->fl_end = OFFSET_MAX;
		fl->fl_type = F_WRLCK;
		if (type & 1)
			fl->fl_type = F_RDLCK;
		fl->fl_pid = 0;
	}
	READ64(clientid);
	READ32(namelen);
	READ_BUF(namelen);
	return -NFS4ERR_DENIED;
}

static int decode_lock(struct xdr_stream *xdr, struct nfs_lock_res *res)
{
	__be32 *p;
	int status;

	status = decode_op_hdr(xdr, OP_LOCK);
	if (status == 0) {
		READ_BUF(sizeof(res->stateid.data));
		COPYMEM(res->stateid.data, sizeof(res->stateid.data));
	} else if (status == -NFS4ERR_DENIED)
		return decode_lock_denied(xdr, NULL);
	return status;
}

static int decode_lockt(struct xdr_stream *xdr, struct nfs_lockt_res *res)
{
	int status;
	status = decode_op_hdr(xdr, OP_LOCKT);
	if (status == -NFS4ERR_DENIED)
		return decode_lock_denied(xdr, res->denied);
	return status;
}

static int decode_locku(struct xdr_stream *xdr, struct nfs_locku_res *res)
{
	__be32 *p;
	int status;

	status = decode_op_hdr(xdr, OP_LOCKU);
	if (status == 0) {
		READ_BUF(sizeof(res->stateid.data));
		COPYMEM(res->stateid.data, sizeof(res->stateid.data));
	}
	return status;
}

static int decode_lookup(struct xdr_stream *xdr)
{
	return decode_op_hdr(xdr, OP_LOOKUP);
}

/* This is too sick! */
static int decode_space_limit(struct xdr_stream *xdr, u64 *maxsize)
{
        __be32 *p;
	uint32_t limit_type, nblocks, blocksize;

	READ_BUF(12);
	READ32(limit_type);
	switch (limit_type) {
		case 1:
			READ64(*maxsize);
			break;
		case 2:
			READ32(nblocks);
			READ32(blocksize);
			*maxsize = (uint64_t)nblocks * (uint64_t)blocksize;
	}
	return 0;
}

static int decode_delegation(struct xdr_stream *xdr, struct nfs_openres *res)
{
        __be32 *p;
        uint32_t delegation_type;

	READ_BUF(4);
	READ32(delegation_type);
	if (delegation_type == NFS4_OPEN_DELEGATE_NONE) {
		res->delegation_type = 0;
		return 0;
	}
	READ_BUF(20);
	COPYMEM(res->delegation.data, sizeof(res->delegation.data));
	READ32(res->do_recall);
	switch (delegation_type) {
		case NFS4_OPEN_DELEGATE_READ:
			res->delegation_type = FMODE_READ;
			break;
		case NFS4_OPEN_DELEGATE_WRITE:
			res->delegation_type = FMODE_WRITE|FMODE_READ;
			if (decode_space_limit(xdr, &res->maxsize) < 0)
				return -EIO;
	}
	return decode_ace(xdr, NULL, res->server->nfs_client);
}

static int decode_open(struct xdr_stream *xdr, struct nfs_openres *res)
{
        __be32 *p;
        uint32_t bmlen;
        int status;

        status = decode_op_hdr(xdr, OP_OPEN);
        if (status)
                return status;
        READ_BUF(sizeof(res->stateid.data));
        COPYMEM(res->stateid.data, sizeof(res->stateid.data));

        decode_change_info(xdr, &res->cinfo);

        READ_BUF(8);
        READ32(res->rflags);
        READ32(bmlen);
        if (bmlen > 10)
                goto xdr_error;

        READ_BUF(bmlen << 2);
        p += bmlen;
	return decode_delegation(xdr, res);
xdr_error:
	dprintk("%s: Bitmap too large! Length = %u\n", __FUNCTION__, bmlen);
	return -EIO;
}

static int decode_open_confirm(struct xdr_stream *xdr, struct nfs_open_confirmres *res)
{
        __be32 *p;
	int status;

        status = decode_op_hdr(xdr, OP_OPEN_CONFIRM);
        if (status)
                return status;
        READ_BUF(sizeof(res->stateid.data));
        COPYMEM(res->stateid.data, sizeof(res->stateid.data));
        return 0;
}

static int decode_open_downgrade(struct xdr_stream *xdr, struct nfs_closeres *res)
{
	__be32 *p;
	int status;

	status = decode_op_hdr(xdr, OP_OPEN_DOWNGRADE);
	if (status)
		return status;
	READ_BUF(sizeof(res->stateid.data));
	COPYMEM(res->stateid.data, sizeof(res->stateid.data));
	return 0;
}

static int decode_putfh(struct xdr_stream *xdr)
{
	return decode_op_hdr(xdr, OP_PUTFH);
}

static int decode_putrootfh(struct xdr_stream *xdr)
{
	return decode_op_hdr(xdr, OP_PUTROOTFH);
}

static int decode_read(struct xdr_stream *xdr, struct rpc_rqst *req, struct nfs_readres *res)
{
	struct kvec *iov = req->rq_rcv_buf.head;
	__be32 *p;
	uint32_t count, eof, recvd, hdrlen;
	int status;

	status = decode_op_hdr(xdr, OP_READ);
	if (status)
		return status;
	READ_BUF(8);
	READ32(eof);
	READ32(count);
	hdrlen = (u8 *) p - (u8 *) iov->iov_base;
	recvd = req->rq_rcv_buf.len - hdrlen;
	if (count > recvd) {
		printk(KERN_WARNING "NFS: server cheating in read reply: "
				"count %u > recvd %u\n", count, recvd);
		count = recvd;
		eof = 0;
	}
	xdr_read_pages(xdr, count);
	res->eof = eof;
	res->count = count;
	return 0;
}

static int decode_readdir(struct xdr_stream *xdr, struct rpc_rqst *req, struct nfs4_readdir_res *readdir)
{
	struct xdr_buf	*rcvbuf = &req->rq_rcv_buf;
	struct page	*page = *rcvbuf->pages;
	struct kvec	*iov = rcvbuf->head;
	unsigned int	nr, pglen = rcvbuf->page_len;
	__be32		*end, *entry, *p, *kaddr;
	uint32_t	len, attrlen, xlen;
	int 		hdrlen, recvd, status;

	status = decode_op_hdr(xdr, OP_READDIR);
	if (status)
		return status;
	READ_BUF(8);
	COPYMEM(readdir->verifier.data, 8);
	dprintk("%s: verifier = 0x%x%x\n",
			__FUNCTION__,
			((u32 *)readdir->verifier.data)[0],
			((u32 *)readdir->verifier.data)[1]);


	hdrlen = (char *) p - (char *) iov->iov_base;
	recvd = rcvbuf->len - hdrlen;
	if (pglen > recvd)
		pglen = recvd;
	xdr_read_pages(xdr, pglen);

	BUG_ON(pglen + readdir->pgbase > PAGE_CACHE_SIZE);
	kaddr = p = kmap_atomic(page, KM_USER0);
	end = p + ((pglen + readdir->pgbase) >> 2);
	entry = p;
	for (nr = 0; *p++; nr++) {
		if (end - p < 3)
			goto short_pkt;
		dprintk("cookie = %Lu, ", *((unsigned long long *)p));
		p += 2;			/* cookie */
		len = ntohl(*p++);	/* filename length */
		if (len > NFS4_MAXNAMLEN) {
			printk(KERN_WARNING "NFS: giant filename in readdir (len 0x%x)\n", len);
			goto err_unmap;
		}
		xlen = XDR_QUADLEN(len);
		if (end - p < xlen + 1)
			goto short_pkt;
		dprintk("filename = %*s\n", len, (char *)p);
		p += xlen;
		len = ntohl(*p++);	/* bitmap length */
		if (end - p < len + 1)
			goto short_pkt;
		p += len;
		attrlen = XDR_QUADLEN(ntohl(*p++));
		if (end - p < attrlen + 2)
			goto short_pkt;
		p += attrlen;		/* attributes */
		entry = p;
	}
	if (!nr && (entry[0] != 0 || entry[1] == 0))
		goto short_pkt;
out:	
	kunmap_atomic(kaddr, KM_USER0);
	return 0;
short_pkt:
	dprintk("%s: short packet at entry %d\n", __FUNCTION__, nr);
	entry[0] = entry[1] = 0;
	/* truncate listing ? */
	if (!nr) {
		printk(KERN_NOTICE "NFS: readdir reply truncated!\n");
		entry[1] = 1;
	}
	goto out;
err_unmap:
	kunmap_atomic(kaddr, KM_USER0);
	return -errno_NFSERR_IO;
}

static int decode_readlink(struct xdr_stream *xdr, struct rpc_rqst *req)
{
	struct xdr_buf *rcvbuf = &req->rq_rcv_buf;
	struct kvec *iov = rcvbuf->head;
	int hdrlen, len, recvd;
	__be32 *p;
	char *kaddr;
	int status;

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

	/* Convert length of symlink */
	READ_BUF(4);
	READ32(len);
	if (len >= rcvbuf->page_len || len <= 0) {
		dprintk(KERN_WARNING "nfs: server returned giant symlink!\n");
		return -ENAMETOOLONG;
	}
	hdrlen = (char *) xdr->p - (char *) iov->iov_base;
	recvd = req->rq_rcv_buf.len - hdrlen;
	if (recvd < len) {
		printk(KERN_WARNING "NFS: server cheating in readlink reply: "
				"count %u > recvd %u\n", len, recvd);
		return -EIO;
	}
	xdr_read_pages(xdr, len);
	/*
	 * The XDR encode routine has set things up so that
	 * the link text will be copied directly into the
	 * buffer.  We just have to do overflow-checking,
	 * and and null-terminate the text (the VFS expects
	 * null-termination).
	 */
	kaddr = (char *)kmap_atomic(rcvbuf->pages[0], KM_USER0);
	kaddr[len+rcvbuf->page_base] = '\0';
	kunmap_atomic(kaddr, KM_USER0);
	return 0;
}

static int decode_remove(struct xdr_stream *xdr, struct nfs4_change_info *cinfo)
{
	int status;

	status = decode_op_hdr(xdr, OP_REMOVE);
	if (status)
		goto out;
	status = decode_change_info(xdr, cinfo);
out:
	return status;
}

static int decode_rename(struct xdr_stream *xdr, struct nfs4_change_info *old_cinfo,
	      struct nfs4_change_info *new_cinfo)
{
	int status;

	status = decode_op_hdr(xdr, OP_RENAME);
	if (status)
		goto out;
	if ((status = decode_change_info(xdr, old_cinfo)))
		goto out;
	status = decode_change_info(xdr, new_cinfo);
out:
	return status;
}

static int decode_renew(struct xdr_stream *xdr)
{
	return decode_op_hdr(xdr, OP_RENEW);
}

static int
decode_restorefh(struct xdr_stream *xdr)
{
	return decode_op_hdr(xdr, OP_RESTOREFH);
}

static int decode_getacl(struct xdr_stream *xdr, struct rpc_rqst *req,
		size_t *acl_len)
{
	__be32 *savep;
	uint32_t attrlen,
		 bitmap[2] = {0};
	struct kvec *iov = req->rq_rcv_buf.head;
	int status;

	*acl_len = 0;
	if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
		goto out;
	if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
		goto out;
	if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
		goto out;

	if (unlikely(bitmap[0] & (FATTR4_WORD0_ACL - 1U)))
		return -EIO;
	if (likely(bitmap[0] & FATTR4_WORD0_ACL)) {
		int hdrlen, recvd;

		/* We ignore &savep and don't do consistency checks on
		 * the attr length.  Let userspace figure it out.... */
		hdrlen = (u8 *)xdr->p - (u8 *)iov->iov_base;
		recvd = req->rq_rcv_buf.len - hdrlen;
		if (attrlen > recvd) {
			printk(KERN_WARNING "NFS: server cheating in getattr"
					" acl reply: attrlen %u > recvd %u\n",
					attrlen, recvd);
			return -EINVAL;
		}
		xdr_read_pages(xdr, attrlen);
		*acl_len = attrlen;
	} else
		status = -EOPNOTSUPP;

out:
	return status;
}

static int
decode_savefh(struct xdr_stream *xdr)
{
	return decode_op_hdr(xdr, OP_SAVEFH);
}

static int decode_setattr(struct xdr_stream *xdr, struct nfs_setattrres *res)
{
	__be32 *p;
	uint32_t bmlen;
	int status;

        
	status = decode_op_hdr(xdr, OP_SETATTR);
	if (status)
		return status;
	READ_BUF(4);
	READ32(bmlen);
	READ_BUF(bmlen << 2);
	return 0;
}

static int decode_setclientid(struct xdr_stream *xdr, struct nfs_client *clp)
{
	__be32 *p;
	uint32_t opnum;
	int32_t nfserr;

	READ_BUF(8);
	READ32(opnum);
	if (opnum != OP_SETCLIENTID) {
		printk(KERN_NOTICE
				"nfs4_decode_setclientid: Server returned operation"
			       	" %d\n", opnum);
		return -EIO;
	}
	READ32(nfserr);
	if (nfserr == NFS_OK) {
		READ_BUF(8 + sizeof(clp->cl_confirm.data));
		READ64(clp->cl_clientid);
		COPYMEM(clp->cl_confirm.data, sizeof(clp->cl_confirm.data));
	} else if (nfserr == NFSERR_CLID_INUSE) {
		uint32_t len;

		/* skip netid string */
		READ_BUF(4);
		READ32(len);
		READ_BUF(len);

		/* skip uaddr string */
		READ_BUF(4);
		READ32(len);
		READ_BUF(len);
		return -NFSERR_CLID_INUSE;
	} else
		return -nfs4_stat_to_errno(nfserr);

	return 0;
}

static int decode_setclientid_confirm(struct xdr_stream *xdr)
{
	return decode_op_hdr(xdr, OP_SETCLIENTID_CONFIRM);
}

static int decode_write(struct xdr_stream *xdr, struct nfs_writeres *res)
{
	__be32 *p;
	int status;

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

	READ_BUF(16);
	READ32(res->count);
	READ32(res->verf->committed);
	COPYMEM(res->verf->verifier, 8);
	return 0;
}

static int decode_delegreturn(struct xdr_stream *xdr)
{
	return decode_op_hdr(xdr, OP_DELEGRETURN);
}

/*
 * Decode OPEN_DOWNGRADE response
 */
static int nfs4_xdr_dec_open_downgrade(struct rpc_rqst *rqstp, __be32 *p, struct nfs_closeres *res)
{
        struct xdr_stream xdr;
        struct compound_hdr hdr;
        int status;

        xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
        status = decode_compound_hdr(&xdr, &hdr);
        if (status)
                goto out;
        status = decode_putfh(&xdr);
        if (status)
                goto out;
        status = decode_open_downgrade(&xdr, res);
	if (status != 0)
		goto out;
	decode_getfattr(&xdr, res->fattr, res->server);
out:
        return status;
}

/*
 * END OF "GENERIC" DECODE ROUTINES.
 */

/*
 * Decode ACCESS response
 */
static int nfs4_xdr_dec_access(struct rpc_rqst *rqstp, __be32 *p, struct nfs4_accessres *res)
{
	struct xdr_stream xdr;
	struct compound_hdr hdr;
	int status;
	
	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
	if ((status = decode_compound_hdr(&xdr, &hdr)) != 0)
		goto out;
	if ((status = decode_putfh(&xdr)) == 0)
		status = decode_access(&xdr, res);
out:
	return status;
}

/*
 * Decode LOOKUP response
 */
static int nfs4_xdr_dec_lookup(struct rpc_rqst *rqstp, __be32 *p, struct nfs4_lookup_res *res)
{
	struct xdr_stream xdr;
	struct compound_hdr hdr;
	int status;
	
	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
	if ((status = decode_compound_hdr(&xdr, &hdr)) != 0)
		goto out;
	if ((status = decode_putfh(&xdr)) != 0)
		goto out;
	if ((status = decode_lookup(&xdr)) != 0)
		goto out;
	if ((status = decode_getfh(&xdr, res->fh)) != 0)
		goto out;
	status = decode_getfattr(&xdr, res->fattr, res->server);
out:
	return status;
}

/*
 * Decode LOOKUP_ROOT response
 */
static int nfs4_xdr_dec_lookup_root(struct rpc_rqst *rqstp, __be32 *p, struct nfs4_lookup_res *res)
{
	struct xdr_stream xdr;
	struct compound_hdr hdr;
	int status;
	
	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
	if ((status = decode_compound_hdr(&xdr, &hdr)) != 0)
		goto out;
	if ((status = decode_putrootfh(&xdr)) != 0)
		goto out;
	if ((status = decode_getfh(&xdr, res->fh)) == 0)
		status = decode_getfattr(&xdr, res->fattr, res->server);
out:
	return status;
}

/*
 * Decode REMOVE response
 */
static int nfs4_xdr_dec_remove(struct rpc_rqst *rqstp, __be32 *p, struct nfs4_remove_res *res)
{
	struct xdr_stream xdr;
	struct compound_hdr hdr;
	int status;
	
	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
	if ((status = decode_compound_hdr(&xdr, &hdr)) != 0)
		goto out;
	if ((status = decode_putfh(&xdr)) != 0)
		goto out;
	if ((status = decode_remove(&xdr, &res->cinfo)) != 0)
		goto out;
	decode_getfattr(&xdr, res->dir_attr, res->server);
out:
	return status;
}

/*
 * Decode RENAME response
 */
static int nfs4_xdr_dec_rename(struct rpc_rqst *rqstp, __be32 *p, struct nfs4_rename_res *res)
{
	struct xdr_stream xdr;
	struct compound_hdr hdr;
	int status;
	
	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
	if ((status = decode_compound_hdr(&xdr, &hdr)) != 0)
		goto out;
	if ((status = decode_putfh(&xdr)) != 0)
		goto out;
	if ((status = decode_savefh(&xdr)) != 0)
		goto out;
	if ((status = decode_putfh(&xdr)) != 0)
		goto out;
	if ((status = decode_rename(&xdr, &res->old_cinfo, &res->new_cinfo)) != 0)
		goto out;
	/* Current FH is target directory */
	if (decode_getfattr(&xdr, res->new_fattr, res->server) != 0)
		goto out;
	if ((status = decode_restorefh(&xdr)) != 0)
		goto out;
	decode_getfattr(&xdr, res->old_fattr, res->server);
out:
	return status;
}

/*
 * Decode LINK response
 */
static int nfs4_xdr_dec_link(struct rpc_rqst *rqstp, __be32 *p, struct nfs4_link_res *res)
{
	struct xdr_stream xdr;
	struct compound_hdr hdr;
	int status;
	
	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
	if ((status = decode_compound_hdr(&xdr, &hdr)) != 0)
		goto out;
	if ((status = decode_putfh(&xdr)) != 0)
		goto out;
	if ((status = decode_savefh(&xdr)) != 0)
		goto out;
	if ((status = decode_putfh(&xdr)) != 0)
		goto out;
	if ((status = decode_link(&xdr, &res->cinfo)) != 0)
		goto out;
	/*
	 * Note order: OP_LINK leaves the directory as the current
	 *             filehandle.
	 */
	if (decode_getfattr(&xdr, res->dir_attr, res->server) != 0)
		goto out;
	if ((status = decode_restorefh(&xdr)) != 0)
		goto out;
	decode_getfattr(&xdr, res->fattr, res->server);
out:
	return status;
}

/*
 * Decode CREATE response
 */
static int nfs4_xdr_dec_create(struct rpc_rqst *rqstp, __be32 *p, struct nfs4_create_res *res)
{
	struct xdr_stream xdr;
	struct compound_hdr hdr;
	int status;
	
	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
	if ((status = decode_compound_hdr(&xdr, &hdr)) != 0)
		goto out;
	if ((status = decode_putfh(&xdr)) != 0)
		goto out;
	if ((status = decode_savefh(&xdr)) != 0)
		goto out;
	if ((status = decode_create(&xdr,&res->dir_cinfo)) != 0)
		goto out;
	if ((status = decode_getfh(&xdr, res->fh)) != 0)
		goto out;
	if (decode_getfattr(&xdr, res->fattr, res->server) != 0)
		goto out;
	if ((status = decode_restorefh(&xdr)) != 0)
		goto out;
	decode_getfattr(&xdr, res->dir_fattr, res->server);
out:
	return status;
}

/*
 * Decode SYMLINK response
 */
static int nfs4_xdr_dec_symlink(struct rpc_rqst *rqstp, __be32 *p, struct nfs4_create_res *res)
{
	return nfs4_xdr_dec_create(rqstp, p, res);
}

/*
 * Decode GETATTR response
 */
static int nfs4_xdr_dec_getattr(struct rpc_rqst *rqstp, __be32 *p, struct nfs4_getattr_res *res)
{
	struct xdr_stream xdr;
	struct compound_hdr hdr;
	int status;
	
	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
	status = decode_compound_hdr(&xdr, &hdr);
	if (status)
		goto out;
	status = decode_putfh(&xdr);
	if (status)
		goto out;
	status = decode_getfattr(&xdr, res->fattr, res->server);
out:
	return status;

}

/*
 * Encode an SETACL request
 */
static int
nfs4_xdr_enc_setacl(struct rpc_rqst *req, __be32 *p, struct nfs_setaclargs *args)
{
        struct xdr_stream xdr;
        struct compound_hdr hdr = {
                .nops   = 2,
        };
        int status;

        xdr_init_encode(&xdr, &req->rq_snd_buf, p);
        encode_compound_hdr(&xdr, &hdr);
        status = encode_putfh(&xdr, args->fh);
        if (status)
                goto out;
        status = encode_setacl(&xdr, args);
out:
        return status;
}
/*
 * Decode SETACL response
 */
static int
nfs4_xdr_dec_setacl(struct rpc_rqst *rqstp, __be32 *p, void *res)
{
	struct xdr_stream xdr;
	struct compound_hdr hdr;
	int status;

	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
	status = decode_compound_hdr(&xdr, &hdr);
	if (status)
		goto out;
	status = decode_putfh(&xdr);
	if (status)
		goto out;
	status = decode_setattr(&xdr, res);
out:
	return status;
}

/*
 * Decode GETACL response
 */
static int
nfs4_xdr_dec_getacl(struct rpc_rqst *rqstp, __be32 *p, size_t *acl_len)
{
	struct xdr_stream xdr;
	struct compound_hdr hdr;
	int status;

	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
	status = decode_compound_hdr(&xdr, &hdr);
	if (status)
		goto out;
	status = decode_putfh(&xdr);
	if (status)
		goto out;
	status = decode_getacl(&xdr, rqstp, acl_len);

out:
	return status;
}

/*
 * Decode CLOSE response
 */
static int nfs4_xdr_dec_close(struct rpc_rqst *rqstp, __be32 *p, struct nfs_closeres *res)
{
        struct xdr_stream xdr;
        struct compound_hdr hdr;
        int status;

        xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
        status = decode_compound_hdr(&xdr, &hdr);
        if (status)
                goto out;
        status = decode_putfh(&xdr);
        if (status)
                goto out;
        status = decode_close(&xdr, res);
	if (status != 0)
		goto out;
	/*
	 * Note: Server may do delete on close for this file
	 * 	in which case the getattr call will fail with
	 * 	an ESTALE error. Shouldn't be a problem,
	 * 	though, since fattr->valid will remain unset.
	 */
	decode_getfattr(&xdr, res->fattr, res->server);
out:
        return status;
}

/*
 * Decode OPEN response
 */
static int nfs4_xdr_dec_open(struct rpc_rqst *rqstp, __be32 *p, struct nfs_openres *res)
{
        struct xdr_stream xdr;
        struct compound_hdr hdr;
        int status;

        xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
        status = decode_compound_hdr(&xdr, &hdr);
        if (status)
                goto out;
        status = decode_putfh(&xdr);
        if (status)
                goto out;
        status = decode_savefh(&xdr);
	if (status)
		goto out;
        status = decode_open(&xdr, res);
        if (status)
                goto out;
	status = decode_getfh(&xdr, &res->fh);
        if (status)
		goto out;
	if (decode_getfattr(&xdr, res->f_attr, res->server) != 0)
		goto out;
	if ((status = decode_restorefh(&xdr)) != 0)
		goto out;
	decode_getfattr(&xdr, res->dir_attr, res->server);
out:
        return status;
}

/*
 * Decode OPEN_CONFIRM response
 */