staging: add Lustre file system client support

Lustre is the most deployed distributed file system
in the HPC (High Performance Computing) world. The patch
adds its client side support.

The code is not very clean and needs to live in drivers/staging
for some time for continuing cleanup work. See
drivers/staging/lustre/TODO for details.

The code is based on Lustre master commit faefbfc04

commit faefbfc0460bc00f2ee4c1c1c86aa1e39b9eea49
Author: Alex Zhuravlev <alexey.zhuravlev@intel.com>
Date:   Tue Apr 30 23:05:21 2013 +0400

    LU-3244 utils: tunefs.lustre should preserve virgin label

Plus a few under-review patches on Whamcloud gerrit:
3.8 kernel support:
http://review.whamcloud.com/#change,5973
http://review.whamcloud.com/#change,5974
http://review.whamcloud.com/#change,5768
http://review.whamcloud.com/#change,5781
http://review.whamcloud.com/#change,5763
http://review.whamcloud.com/#change,5613
http://review.whamcloud.com/#change,5655

3.9 kernel support:
http://review.whamcloud.com/#change,5898
http://review.whamcloud.com/#change,5899

Kconfig/Kbuild:
http://review.whamcloud.com/#change,4646
http://review.whamcloud.com/#change,4644

libcfs cleanup:
http://review.whamcloud.com/#change,2831
http://review.whamcloud.com/#change,4775
http://review.whamcloud.com/#change,4776
http://review.whamcloud.com/#change,4777
http://review.whamcloud.com/#change,4778
http://review.whamcloud.com/#change,4779
http://review.whamcloud.com/#change,4780

All starting/trailing whitespaces are removed, to match kernel
coding style. Also ran scripts/cleanfile on all lustre source files.

[maked the Kconfig depend on BROKEN as the recent procfs changes causes
this to fail - gregkh]

Signed-off-by: Peng Tao <tao.peng@emc.com>
Signed-off-by: Andreas Dilger <andreas.dilger@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 132 insertions, 0 deletions

diff --git a/drivers/staging/lustre/include/linux/libcfs/libcfs_time.h b/drivers/staging/lustre/include/linux/libcfs/libcfs_time.h
new file mode 100644
index 000000000000..4bdd77163d5e
--- /dev/null
+++ b/drivers/staging/lustre/include/linux/libcfs/libcfs_time.h
@@ -0,0 +1,132 @@
+/*
+ * 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 cfs_time_t cfs_time_add(cfs_time_t t, cfs_duration_t d)
+{
+	return (cfs_time_t)(t + d);
+}
+
+static inline cfs_duration_t cfs_time_sub(cfs_time_t t1, cfs_time_t t2)
+{
+	return (cfs_time_t)(t1 - t2);
+}
+
+static inline int cfs_time_after(cfs_time_t t1, cfs_time_t t2)
+{
+	return cfs_time_before(t2, t1);
+}
+
+static inline int cfs_time_aftereq(cfs_time_t t1, cfs_time_t t2)
+{
+	return cfs_time_beforeq(t2, t1);
+}
+
+
+static inline cfs_time_t 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(cfs_time_t 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 = 0;		       \
+	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)
+{
+	cfs_fs_time_t 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 cfs_duration_t cfs_timeout_cap(cfs_duration_t timeout)
+{
+	if (timeout < CFS_TICK)
+		timeout = CFS_TICK;
+	return timeout;
+}
+
+#endif