1 files changed, 127 insertions, 0 deletions

diff --git a/fs/nfs/callback_proc.c b/fs/nfs/callback_proc.c
index f7e83e23cf9f..b7da1f54da68 100644
--- a/fs/nfs/callback_proc.c
+++ b/fs/nfs/callback_proc.c
@@ -101,3 +101,130 @@ out:
         dprintk("%s: exit with status = %d\n", __func__, ntohl(res));
         return res;
 }
+
+#if defined(CONFIG_NFS_V4_1)
+
+/*
+ * Validate the sequenceID sent by the server.
+ * Return success if the sequenceID is one more than what we last saw on
+ * this slot, accounting for wraparound.  Increments the slot's sequence.
+ *
+ * We don't yet implement a duplicate request cache, so at this time
+ * we will log replays, and process them as if we had not seen them before,
+ * but we don't bump the sequence in the slot.  Not too worried about it,
+ * since we only currently implement idempotent callbacks anyway.
+ *
+ * We have a single slot backchannel at this time, so we don't bother
+ * checking the used_slots bit array on the table.  The lower layer guarantees
+ * a single outstanding callback request at a time.
+ */
+static int
+validate_seqid(struct nfs4_slot_table *tbl, u32 slotid, u32 seqid)
+{
+        struct nfs4_slot *slot;
+
+        dprintk("%s enter. slotid %d seqid %d\n",
+                __func__, slotid, seqid);
+
+        if (slotid > NFS41_BC_MAX_CALLBACKS)
+                return htonl(NFS4ERR_BADSLOT);
+
+        slot = tbl->slots + slotid;
+        dprintk("%s slot table seqid: %d\n", __func__, slot->seq_nr);
+
+        /* Normal */
+        if (likely(seqid == slot->seq_nr + 1)) {
+                slot->seq_nr++;
+                return htonl(NFS4_OK);
+        }
+
+        /* Replay */
+        if (seqid == slot->seq_nr) {
+                dprintk("%s seqid %d is a replay - no DRC available\n",
+                        __func__, seqid);
+                return htonl(NFS4_OK);
+        }
+
+        /* Wraparound */
+        if (seqid == 1 && (slot->seq_nr + 1) == 0) {
+                slot->seq_nr = 1;
+                return htonl(NFS4_OK);
+        }
+
+        /* Misordered request */
+        return htonl(NFS4ERR_SEQ_MISORDERED);
+}
+
+/*
+ * Returns a pointer to a held 'struct nfs_client' that matches the server's
+ * address, major version number, and session ID.  It is the caller's
+ * responsibility to release the returned reference.
+ *
+ * Returns NULL if there are no connections with sessions, or if no session
+ * matches the one of interest.
+ */
+ static struct nfs_client *find_client_with_session(
+        const struct sockaddr *addr, u32 nfsversion,
+        struct nfs4_sessionid *sessionid)
+{
+        struct nfs_client *clp;
+
+        clp = nfs_find_client(addr, 4);
+        if (clp == NULL)
+                return NULL;
+
+        do {
+                struct nfs_client *prev = clp;
+
+                if (clp->cl_session != NULL) {
+                        if (memcmp(clp->cl_session->sess_id.data,
+                                        sessionid->data,
+                                        NFS4_MAX_SESSIONID_LEN) == 0) {
+                                /* Returns a held reference to clp */
+                                return clp;
+                        }
+                }
+                clp = nfs_find_client_next(prev);
+                nfs_put_client(prev);
+        } while (clp != NULL);
+
+        return NULL;
+}
+
+/* FIXME: referring calls should be processed */
+unsigned nfs4_callback_sequence(struct cb_sequenceargs *args,
+                                struct cb_sequenceres *res)
+{
+        struct nfs_client *clp;
+        int i, status;
+
+        for (i = 0; i < args->csa_nrclists; i++)
+                kfree(args->csa_rclists[i].rcl_refcalls);
+        kfree(args->csa_rclists);
+
+        status = htonl(NFS4ERR_BADSESSION);
+        clp = find_client_with_session(args->csa_addr, 4, &args->csa_sessionid);
+        if (clp == NULL)
+                goto out;
+
+        status = validate_seqid(&clp->cl_session->bc_slot_table,
+                                args->csa_slotid, args->csa_sequenceid);
+        if (status)
+                goto out_putclient;
+
+        memcpy(&res->csr_sessionid, &args->csa_sessionid,
+               sizeof(res->csr_sessionid));
+        res->csr_sequenceid = args->csa_sequenceid;
+        res->csr_slotid = args->csa_slotid;
+        res->csr_highestslotid = NFS41_BC_MAX_CALLBACKS - 1;
+        res->csr_target_highestslotid = NFS41_BC_MAX_CALLBACKS - 1;
+
+out_putclient:
+        nfs_put_client(clp);
+out:
+        dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
+        res->csr_status = status;
+        return res->csr_status;
+}
+
+#endif /* CONFIG_NFS_V4_1 */