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, 176 insertions, 0 deletions

diff --git a/drivers/staging/lustre/lustre/include/obd_cksum.h b/drivers/staging/lustre/lustre/include/obd_cksum.h
new file mode 100644
index 000000000000..5f740f1743ca
--- /dev/null
+++ b/drivers/staging/lustre/lustre/include/obd_cksum.h
@@ -0,0 +1,176 @@
+/*
+ * 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.
+ */
+
+#ifndef __OBD_CKSUM
+#define __OBD_CKSUM
+#include <linux/libcfs/libcfs.h>
+#include <lustre/lustre_idl.h>
+
+static inline unsigned char cksum_obd2cfs(cksum_type_t cksum_type)
+{
+	switch (cksum_type) {
+	case OBD_CKSUM_CRC32:
+		return CFS_HASH_ALG_CRC32;
+	case OBD_CKSUM_ADLER:
+		return CFS_HASH_ALG_ADLER32;
+	case OBD_CKSUM_CRC32C:
+		return CFS_HASH_ALG_CRC32C;
+	default:
+		CERROR("Unknown checksum type (%x)!!!\n", cksum_type);
+		LBUG();
+	}
+	return 0;
+}
+
+/* The OBD_FL_CKSUM_* flags is packed into 5 bits of o_flags, since there can
+ * only be a single checksum type per RPC.
+ *
+ * The OBD_CHECKSUM_* type bits passed in ocd_cksum_types are a 32-bit bitmask
+ * since they need to represent the full range of checksum algorithms that
+ * both the client and server can understand.
+ *
+ * In case of an unsupported types/flags we fall back to ADLER
+ * because that is supported by all clients since 1.8
+ *
+ * In case multiple algorithms are supported the best one is used. */
+static inline obd_flag cksum_type_pack(cksum_type_t cksum_type)
+{
+	unsigned int    performance = 0, tmp;
+	obd_flag	flag = OBD_FL_CKSUM_ADLER;
+
+	if (cksum_type & OBD_CKSUM_CRC32) {
+		tmp = cfs_crypto_hash_speed(cksum_obd2cfs(OBD_CKSUM_CRC32));
+		if (tmp > performance) {
+			performance = tmp;
+			flag = OBD_FL_CKSUM_CRC32;
+		}
+	}
+	if (cksum_type & OBD_CKSUM_CRC32C) {
+		tmp = cfs_crypto_hash_speed(cksum_obd2cfs(OBD_CKSUM_CRC32C));
+		if (tmp > performance) {
+			performance = tmp;
+			flag = OBD_FL_CKSUM_CRC32C;
+		}
+	}
+	if (cksum_type & OBD_CKSUM_ADLER) {
+		tmp = cfs_crypto_hash_speed(cksum_obd2cfs(OBD_CKSUM_ADLER));
+		if (tmp > performance) {
+			performance = tmp;
+			flag = OBD_FL_CKSUM_ADLER;
+		}
+	}
+	if (unlikely(cksum_type && !(cksum_type & (OBD_CKSUM_CRC32C |
+						   OBD_CKSUM_CRC32 |
+						   OBD_CKSUM_ADLER))))
+		CWARN("unknown cksum type %x\n", cksum_type);
+
+	return flag;
+}
+
+static inline cksum_type_t cksum_type_unpack(obd_flag o_flags)
+{
+	switch (o_flags & OBD_FL_CKSUM_ALL) {
+	case OBD_FL_CKSUM_CRC32C:
+		return OBD_CKSUM_CRC32C;
+	case OBD_FL_CKSUM_CRC32:
+		return OBD_CKSUM_CRC32;
+	default:
+		break;
+	}
+
+	return OBD_CKSUM_ADLER;
+}
+
+/* Return a bitmask of the checksum types supported on this system.
+ * 1.8 supported ADLER it is base and not depend on hw
+ * Client uses all available local algos
+ */
+static inline cksum_type_t cksum_types_supported_client(void)
+{
+	cksum_type_t ret = OBD_CKSUM_ADLER;
+
+	CDEBUG(D_INFO, "Crypto hash speed: crc %d, crc32c %d, adler %d\n",
+	       cfs_crypto_hash_speed(cksum_obd2cfs(OBD_CKSUM_CRC32)),
+	       cfs_crypto_hash_speed(cksum_obd2cfs(OBD_CKSUM_CRC32C)),
+	       cfs_crypto_hash_speed(cksum_obd2cfs(OBD_CKSUM_ADLER)));
+
+	if (cfs_crypto_hash_speed(cksum_obd2cfs(OBD_CKSUM_CRC32C)) > 0)
+		ret |= OBD_CKSUM_CRC32C;
+	if (cfs_crypto_hash_speed(cksum_obd2cfs(OBD_CKSUM_CRC32)) > 0)
+		ret |= OBD_CKSUM_CRC32;
+
+	return ret;
+}
+
+/* Server uses algos that perform at 50% or better of the Adler */
+static inline cksum_type_t cksum_types_supported_server(void)
+{
+	int	     base_speed;
+	cksum_type_t    ret = OBD_CKSUM_ADLER;
+
+	CDEBUG(D_INFO, "Crypto hash speed: crc %d, crc32c %d, adler %d\n",
+	       cfs_crypto_hash_speed(cksum_obd2cfs(OBD_CKSUM_CRC32)),
+	       cfs_crypto_hash_speed(cksum_obd2cfs(OBD_CKSUM_CRC32C)),
+	       cfs_crypto_hash_speed(cksum_obd2cfs(OBD_CKSUM_ADLER)));
+
+	base_speed = cfs_crypto_hash_speed(cksum_obd2cfs(OBD_CKSUM_ADLER)) / 2;
+
+	if (cfs_crypto_hash_speed(cksum_obd2cfs(OBD_CKSUM_CRC32C)) >=
+	    base_speed)
+		ret |= OBD_CKSUM_CRC32C;
+	if (cfs_crypto_hash_speed(cksum_obd2cfs(OBD_CKSUM_CRC32)) >=
+	    base_speed)
+		ret |= OBD_CKSUM_CRC32;
+
+	return ret;
+}
+
+
+/* Select the best checksum algorithm among those supplied in the cksum_types
+ * input.
+ *
+ * Currently, calling cksum_type_pack() with a mask will return the fastest
+ * checksum type due to its benchmarking at libcfs module load.
+ * Caution is advised, however, since what is fastest on a single client may
+ * not be the fastest or most efficient algorithm on the server.  */
+static inline cksum_type_t cksum_type_select(cksum_type_t cksum_types)
+{
+	return cksum_type_unpack(cksum_type_pack(cksum_types));
+}
+
+/* Checksum algorithm names. Must be defined in the same order as the
+ * OBD_CKSUM_* flags. */
+#define DECLARE_CKSUM_NAME char *cksum_name[] = {"crc32", "adler", "crc32c"}
+
+#endif /* __OBD_H */