static int
nfs4_xdr_dec_cb_recall(struct rpc_rqst *rqstp, __be32 *p)
{
struct xdr_stream xdr;
struct nfs4_cb_compound_hdr hdr;
int status;
xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
status = decode_cb_compound_hdr(&xdr, &hdr);
if (status)
goto out;
status = decode_cb_op_hdr(&xdr, OP_CB_RECALL);
out:
return status;
}
/*
* Our current back channel implmentation supports a single backchannel
* with a single slot.
*/
static int
decode_cb_sequence(struct xdr_stream *xdr, struct nfsd4_callback *cb,
struct rpc_rqst *rqstp)
{
struct nfsd4_session *ses = cb->cb_clp->cl_cb_session;
struct nfs4_sessionid id;
int status;
u32 dummy;
__be32 *p;
if (cb->cb_minorversion == 0)
return 0;
status = decode_cb_op_hdr(xdr, OP_CB_SEQUENCE);
if (status)
return status;
/*
* If the server returns different values for sessionID, slotID or
* sequence number, the server is looney tunes.
*/
status = -ESERVERFAULT;
READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
memcpy(id.data, p, NFS4_MAX_SESSIONID_LEN);
p += XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN);
if (memcmp(id.data, ses->se_sessionid.data, NFS4_MAX_SESSIONID_LEN)) {
dprintk("%s Invalid session id\n", __func__);
goto out;
}
READ32(dummy);
if (dummy != ses->se_cb_seq_nr) {
dprintk("%s Invalid sequence number\n", __func__);
goto out;
}
READ32(dummy); /* slotid must be 0 */
if (dummy != 0) {
dprintk("%s Invalid slotid\n", __func__);
goto out;
}
/* FIXME: process highest slotid and target highest slotid */
status = 0;
out:
return status;
}