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-rw-r--r--fs/nfs/callback_proc.c55
1 files changed, 55 insertions, 0 deletions
diff --git a/fs/nfs/callback_proc.c b/fs/nfs/callback_proc.c
index defa9b4c470e..631b44c1439b 100644
--- a/fs/nfs/callback_proc.c
+++ b/fs/nfs/callback_proc.c
@@ -225,6 +225,61 @@ validate_seqid(struct nfs4_slot_table *tbl, u32 slotid, u32 seqid)
return NULL;
}
+/*
+ * For each referring call triple, check the session's slot table for
+ * a match. If the slot is in use and the sequence numbers match, the
+ * client is still waiting for a response to the original request.
+ */
+static bool referring_call_exists(struct nfs_client *clp,
+ uint32_t nrclists,
+ struct referring_call_list *rclists)
+{
+ bool status = 0;
+ int i, j;
+ struct nfs4_session *session;
+ struct nfs4_slot_table *tbl;
+ struct referring_call_list *rclist;
+ struct referring_call *ref;
+
+ /*
+ * XXX When client trunking is implemented, this becomes
+ * a session lookup from within the loop
+ */
+ session = clp->cl_session;
+ tbl = &session->fc_slot_table;
+
+ for (i = 0; i < nrclists; i++) {
+ rclist = &rclists[i];
+ if (memcmp(session->sess_id.data,
+ rclist->rcl_sessionid.data,
+ NFS4_MAX_SESSIONID_LEN) != 0)
+ continue;
+
+ for (j = 0; j < rclist->rcl_nrefcalls; j++) {
+ ref = &rclist->rcl_refcalls[j];
+
+ dprintk("%s: sessionid %x:%x:%x:%x sequenceid %u "
+ "slotid %u\n", __func__,
+ ((u32 *)&rclist->rcl_sessionid.data)[0],
+ ((u32 *)&rclist->rcl_sessionid.data)[1],
+ ((u32 *)&rclist->rcl_sessionid.data)[2],
+ ((u32 *)&rclist->rcl_sessionid.data)[3],
+ ref->rc_sequenceid, ref->rc_slotid);
+
+ spin_lock(&tbl->slot_tbl_lock);
+ status = (test_bit(ref->rc_slotid, tbl->used_slots) &&
+ tbl->slots[ref->rc_slotid].seq_nr ==
+ ref->rc_sequenceid);
+ spin_unlock(&tbl->slot_tbl_lock);
+ if (status)
+ goto out;
+ }
+ }
+
+out:
+ return status;
+}
+
/* FIXME: referring calls should be processed */
unsigned nfs4_callback_sequence(struct cb_sequenceargs *args,
struct cb_sequenceres *res)