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, 219 insertions, 0 deletions

diff --git a/drivers/staging/lustre/lustre/ptlrpc/gss/lproc_gss.c b/drivers/staging/lustre/lustre/ptlrpc/gss/lproc_gss.c
new file mode 100644
index 000000000000..2522e0517282
--- /dev/null
+++ b/drivers/staging/lustre/lustre/ptlrpc/gss/lproc_gss.c
@@ -0,0 +1,219 @@
+/*
+ * 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) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Use is subject to license terms.
+ *
+ * Copyright (c) 2012, Intel Corporation.
+ */
+/*
+ * This file is part of Lustre, http://www.lustre.org/
+ * Lustre is a trademark of Sun Microsystems, Inc.
+ */
+
+#define DEBUG_SUBSYSTEM S_SEC
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/dcache.h>
+#include <linux/fs.h>
+#include <linux/mutex.h>
+
+#include <obd.h>
+#include <obd_class.h>
+#include <obd_support.h>
+#include <lustre/lustre_idl.h>
+#include <lustre_net.h>
+#include <lustre_import.h>
+#include <lprocfs_status.h>
+#include <lustre_sec.h>
+
+#include "gss_err.h"
+#include "gss_internal.h"
+#include "gss_api.h"
+
+static struct proc_dir_entry *gss_proc_root = NULL;
+static struct proc_dir_entry *gss_proc_lk = NULL;
+
+/*
+ * statistic of "out-of-sequence-window"
+ */
+static struct {
+	spinlock_t  oos_lock;
+	atomic_t    oos_cli_count;       /* client occurrence */
+	int	     oos_cli_behind;      /* client max seqs behind */
+	atomic_t    oos_svc_replay[3];   /* server replay detected */
+	atomic_t    oos_svc_pass[3];     /* server verified ok */
+} gss_stat_oos = {
+	.oos_cli_count  = ATOMIC_INIT(0),
+	.oos_cli_behind = 0,
+	.oos_svc_replay = { ATOMIC_INIT(0), },
+	.oos_svc_pass   = { ATOMIC_INIT(0), },
+};
+
+void gss_stat_oos_record_cli(int behind)
+{
+	atomic_inc(&gss_stat_oos.oos_cli_count);
+
+	spin_lock(&gss_stat_oos.oos_lock);
+	if (behind > gss_stat_oos.oos_cli_behind)
+		gss_stat_oos.oos_cli_behind = behind;
+	spin_unlock(&gss_stat_oos.oos_lock);
+}
+
+void gss_stat_oos_record_svc(int phase, int replay)
+{
+	LASSERT(phase >= 0 && phase <= 2);
+
+	if (replay)
+		atomic_inc(&gss_stat_oos.oos_svc_replay[phase]);
+	else
+		atomic_inc(&gss_stat_oos.oos_svc_pass[phase]);
+}
+
+static int gss_proc_read_oos(char *page, char **start, off_t off, int count,
+			     int *eof, void *data)
+{
+	int written;
+
+	written = snprintf(page, count,
+			"seqwin:		%u\n"
+			"backwin:	       %u\n"
+			"client fall behind seqwin\n"
+			"  occurrence:	  %d\n"
+			"  max seq behind:      %d\n"
+			"server replay detected:\n"
+			"  phase 0:	     %d\n"
+			"  phase 1:	     %d\n"
+			"  phase 2:	     %d\n"
+			"server verify ok:\n"
+			"  phase 2:	     %d\n",
+			GSS_SEQ_WIN_MAIN,
+			GSS_SEQ_WIN_BACK,
+			atomic_read(&gss_stat_oos.oos_cli_count),
+			gss_stat_oos.oos_cli_behind,
+			atomic_read(&gss_stat_oos.oos_svc_replay[0]),
+			atomic_read(&gss_stat_oos.oos_svc_replay[1]),
+			atomic_read(&gss_stat_oos.oos_svc_replay[2]),
+			atomic_read(&gss_stat_oos.oos_svc_pass[2]));
+
+	return written;
+}
+
+static int gss_proc_write_secinit(struct file *file, const char *buffer,
+				  unsigned long count, void *data)
+{
+	int rc;
+
+	rc = gss_do_ctx_init_rpc((char *) buffer, count);
+	if (rc) {
+		LASSERT(rc < 0);
+		return rc;
+	}
+
+	return ((int) count);
+}
+
+static struct lprocfs_vars gss_lprocfs_vars[] = {
+	{ "replays", gss_proc_read_oos, NULL },
+	{ "init_channel", NULL, gss_proc_write_secinit, NULL, NULL, 0222 },
+	{ NULL }
+};
+
+/*
+ * for userspace helper lgss_keyring.
+ *
+ * debug_level: [0, 4], defined in utils/gss/lgss_utils.h
+ */
+static int gss_lk_debug_level = 1;
+
+static int gss_lk_proc_read_dl(char *page, char **start, off_t off,
+			       int count, int *eof, void *data)
+{
+	return snprintf(page, count, "%u\n", gss_lk_debug_level);
+}
+
+static int gss_lk_proc_write_dl(struct file *file, const char *buffer,
+				unsigned long count, void *data)
+{
+	int     val, rc;
+
+	rc = lprocfs_write_helper(buffer, count, &val);
+	if (rc < 0)
+		return rc;
+
+	if (val < 0 || val > 4)
+		return -ERANGE;
+
+	gss_lk_debug_level = val;
+	return count;
+}
+
+static struct lprocfs_vars gss_lk_lprocfs_vars[] = {
+	{ "debug_level", gss_lk_proc_read_dl, gss_lk_proc_write_dl, NULL },
+	{ NULL }
+};
+
+void gss_exit_lproc(void)
+{
+	if (gss_proc_lk) {
+		lprocfs_remove(&gss_proc_lk);
+		gss_proc_lk = NULL;
+	}
+
+	if (gss_proc_root) {
+		lprocfs_remove(&gss_proc_root);
+		gss_proc_root = NULL;
+	}
+}
+
+int gss_init_lproc(void)
+{
+	int     rc;
+
+	spin_lock_init(&gss_stat_oos.oos_lock);
+
+	gss_proc_root = lprocfs_register("gss", sptlrpc_proc_root,
+					 gss_lprocfs_vars, NULL);
+	if (IS_ERR(gss_proc_root)) {
+		gss_proc_root = NULL;
+		GOTO(err_out, rc = PTR_ERR(gss_proc_root));
+	}
+
+	gss_proc_lk = lprocfs_register("lgss_keyring", gss_proc_root,
+				       gss_lk_lprocfs_vars, NULL);
+	if (IS_ERR(gss_proc_lk)) {
+		gss_proc_lk = NULL;
+		GOTO(err_out, rc = PTR_ERR(gss_proc_root));
+	}
+
+	return 0;
+
+err_out:
+	CERROR("failed to initialize gss lproc entries: %d\n", rc);
+	gss_exit_lproc();
+	return rc;
+}