nfsd41: Backchannel: cb_sequence callback

[safe/jmp/linux-2.6] / fs / nfsd / nfs4callback.c

diff --git a/fs/nfsd/nfs4callback.c b/fs/nfsd/nfs4callback.c
index 25a0906..d37707d 100644 (file)
--- a/fs/nfsd/nfs4callback.c
+++ b/fs/nfsd/nfs4callback.c
@@ -256,6 +256,27 @@ encode_cb_recall(struct xdr_stream *xdr, struct nfs4_delegation *dp,
        hdr->nops++;
 }
 
+static void
+encode_cb_sequence(struct xdr_stream *xdr, struct nfsd4_cb_sequence *args,
+                  struct nfs4_cb_compound_hdr *hdr)
+{
+       __be32 *p;
+
+       if (hdr->minorversion == 0)
+               return;
+
+       RESERVE_SPACE(1 + NFS4_MAX_SESSIONID_LEN + 20);
+
+       WRITE32(OP_CB_SEQUENCE);
+       WRITEMEM(args->cbs_clp->cl_sessionid.data, NFS4_MAX_SESSIONID_LEN);
+       WRITE32(args->cbs_clp->cl_cb_seq_nr);
+       WRITE32(0);             /* slotid, always 0 */
+       WRITE32(0);             /* highest slotid always 0 */
+       WRITE32(0);             /* cachethis always 0 */
+       WRITE32(0); /* FIXME: support referring_call_lists */
+       hdr->nops++;
+}
+
 static int
 nfs4_xdr_enc_cb_null(struct rpc_rqst *req, __be32 *p)
 {
@@ -317,6 +338,57 @@ decode_cb_op_hdr(struct xdr_stream *xdr, enum nfs_opnum4 expected)
        return 0;
 }
 
+/*
+ * Our current back channel implmentation supports a single backchannel
+ * with a single slot.
+ */
+static int
+decode_cb_sequence(struct xdr_stream *xdr, struct nfsd4_cb_sequence *res,
+                  struct rpc_rqst *rqstp)
+{
+       struct nfs4_sessionid id;
+       int status;
+       u32 dummy;
+       __be32 *p;
+
+       if (res->cbs_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, res->cbs_clp->cl_sessionid.data,
+                  NFS4_MAX_SESSIONID_LEN)) {
+               dprintk("%s Invalid session id\n", __func__);
+               goto out;
+       }
+       READ32(dummy);
+       if (dummy != res->cbs_clp->cl_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;
+}
+
+
 static int
 nfs4_xdr_dec_cb_null(struct rpc_rqst *req, __be32 *p)
 {