Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / staging / lustre / include / linux / libcfs / libcfs_time.h

diff --git a/kernel/drivers/staging/lustre/include/linux/libcfs/libcfs_time.h b/kernel/drivers/staging/lustre/include/linux/libcfs/libcfs_time.h
new file mode 100644 (file)
index 0000000..5de6da0
--- /dev/null
+++ b/kernel/drivers/staging/lustre/include/linux/libcfs/libcfs_time.h
@@ -0,0 +1,131 @@
+/*
+ * GPL HEADER START
+ *
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 only,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License version 2 for more details (a copy is included
+ * in the LICENSE file that accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License
+ * version 2 along with this program; If not, see
+ * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ * GPL HEADER END
+ */
+/*
+ * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Use is subject to license terms.
+ */
+/*
+ * This file is part of Lustre, http://www.lustre.org/
+ * Lustre is a trademark of Sun Microsystems, Inc.
+ *
+ * libcfs/include/libcfs/libcfs_time.h
+ *
+ * Time functions.
+ *
+ */
+
+#ifndef __LIBCFS_TIME_H__
+#define __LIBCFS_TIME_H__
+/*
+ * generic time manipulation functions.
+ */
+
+static inline unsigned long cfs_time_add(unsigned long t, long d)
+{
+       return (unsigned long)(t + d);
+}
+
+static inline unsigned long cfs_time_sub(unsigned long t1, unsigned long t2)
+{
+       return (unsigned long)(t1 - t2);
+}
+
+static inline int cfs_time_after(unsigned long t1, unsigned long t2)
+{
+       return time_before(t2, t1);
+}
+
+static inline int cfs_time_aftereq(unsigned long t1, unsigned long t2)
+{
+       return time_before_eq(t2, t1);
+}
+
+static inline unsigned long cfs_time_shift(int seconds)
+{
+       return cfs_time_add(cfs_time_current(), cfs_time_seconds(seconds));
+}
+
+static inline long cfs_timeval_sub(struct timeval *large, struct timeval *small,
+                                  struct timeval *result)
+{
+       long r = (long)(
+               (large->tv_sec - small->tv_sec) * ONE_MILLION +
+               (large->tv_usec - small->tv_usec));
+       if (result != NULL) {
+               result->tv_usec = r % ONE_MILLION;
+               result->tv_sec = r / ONE_MILLION;
+       }
+       return r;
+}
+
+static inline void cfs_slow_warning(unsigned long now, int seconds, char *msg)
+{
+       if (cfs_time_after(cfs_time_current(),
+                          cfs_time_add(now, cfs_time_seconds(15))))
+               CERROR("slow %s "CFS_TIME_T" sec\n", msg,
+                      cfs_duration_sec(cfs_time_sub(cfs_time_current(), now)));
+}
+
+#define CFS_RATELIMIT(seconds)                           \
+({                                                           \
+       /*                                                    \
+        * XXX nikita: non-portable initializer          \
+        */                                                  \
+       static time_t __next_message;                  \
+       int result;                                          \
+                                                               \
+       if (cfs_time_after(cfs_time_current(), __next_message)) \
+               result = 1;                                  \
+       else {                                            \
+               __next_message = cfs_time_shift(seconds);       \
+               result = 0;                                  \
+       }                                                      \
+       result;                                          \
+})
+
+/*
+ * helper function similar to do_gettimeofday() of Linux kernel
+ */
+static inline void cfs_fs_timeval(struct timeval *tv)
+{
+       struct timespec time;
+
+       cfs_fs_time_current(&time);
+       cfs_fs_time_usec(&time, tv);
+}
+
+/*
+ * return valid time-out based on user supplied one. Currently we only check
+ * that time-out is not shorted than allowed.
+ */
+static inline long cfs_timeout_cap(long timeout)
+{
+       if (timeout < CFS_TICK)
+               timeout = CFS_TICK;
+       return timeout;
+}
+
+#endif