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-rw-r--r--include/linux/sunrpc/timer.h49
1 files changed, 49 insertions, 0 deletions
diff --git a/include/linux/sunrpc/timer.h b/include/linux/sunrpc/timer.h
new file mode 100644
index 000000000000..a67fd734c73b
--- /dev/null
+++ b/include/linux/sunrpc/timer.h
@@ -0,0 +1,49 @@
+/*
+ * linux/include/linux/sunrpc/timer.h
+ *
+ * Declarations for the RPC transport timer.
+ *
+ * Copyright (C) 2002 Trond Myklebust <trond.myklebust@fys.uio.no>
+ */
+
+#ifndef _LINUX_SUNRPC_TIMER_H
+#define _LINUX_SUNRPC_TIMER_H
+
+#include <asm/atomic.h>
+
+struct rpc_rtt {
+ unsigned long timeo; /* default timeout value */
+ unsigned long srtt[5]; /* smoothed round trip time << 3 */
+ unsigned long sdrtt[5]; /* smoothed medium deviation of RTT */
+ int ntimeouts[5]; /* Number of timeouts for the last request */
+};
+
+
+extern void rpc_init_rtt(struct rpc_rtt *rt, unsigned long timeo);
+extern void rpc_update_rtt(struct rpc_rtt *rt, unsigned timer, long m);
+extern unsigned long rpc_calc_rto(struct rpc_rtt *rt, unsigned timer);
+
+static inline void rpc_set_timeo(struct rpc_rtt *rt, int timer, int ntimeo)
+{
+ int *t;
+ if (!timer)
+ return;
+ t = &rt->ntimeouts[timer-1];
+ if (ntimeo < *t) {
+ if (*t > 0)
+ (*t)--;
+ } else {
+ if (ntimeo > 8)
+ ntimeo = 8;
+ *t = ntimeo;
+ }
+}
+
+static inline int rpc_ntimeo(struct rpc_rtt *rt, int timer)
+{
+ if (!timer)
+ return 0;
+ return rt->ntimeouts[timer-1];
+}
+
+#endif /* _LINUX_SUNRPC_TIMER_H */