staging: lustre: move libcfs to lnet layer

The lustre file system has a layered architecture with
libcfs as the lowest layer and LNet layered on top. Then
on top of LNet we run the lustre client. This patch moves
the libcfs module code out of lustre into the lnet tree.
This fits into the long term goal of eventually merging
libcfs into LNet.

Signed-off-by: James Simmons <jsimmons@infradead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 200 insertions, 0 deletions

diff --git a/drivers/staging/lustre/lnet/libcfs/linux/linux-debug.c b/drivers/staging/lustre/lnet/libcfs/linux/linux-debug.c
new file mode 100644
index 0000000..638e4b3
--- /dev/null
+++ b/drivers/staging/lustre/lnet/libcfs/linux/linux-debug.c
@@ -0,0 +1,200 @@
+/*
+ * 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.
+ *
+ * Copyright (c) 2012, Intel Corporation.
+ */
+/*
+ * This file is part of Lustre, http://www.lustre.org/
+ * Lustre is a trademark of Sun Microsystems, Inc.
+ *
+ * libcfs/libcfs/linux/linux-debug.c
+ *
+ * Author: Phil Schwan <phil@clusterfs.com>
+ */
+
+#include <linux/module.h>
+#include <linux/kmod.h>
+#include <linux/notifier.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/string.h>
+#include <linux/stat.h>
+#include <linux/errno.h>
+#include <linux/unistd.h>
+#include <linux/interrupt.h>
+#include <linux/completion.h>
+#include <linux/fs.h>
+#include <linux/uaccess.h>
+#include <linux/miscdevice.h>
+
+# define DEBUG_SUBSYSTEM S_LNET
+
+#include "../../../include/linux/libcfs/libcfs.h"
+
+#include "../tracefile.h"
+
+#include <linux/kallsyms.h>
+
+char lnet_upcall[1024] = "/usr/lib/lustre/lnet_upcall";
+char lnet_debug_log_upcall[1024] = "/usr/lib/lustre/lnet_debug_log_upcall";
+
+/**
+ * Upcall function once a Lustre log has been dumped.
+ *
+ * \param file  path of the dumped log
+ */
+void libcfs_run_debug_log_upcall(char *file)
+{
+	char *argv[3];
+	int   rc;
+	char *envp[] = {
+		"HOME=/",
+		"PATH=/sbin:/bin:/usr/sbin:/usr/bin",
+		NULL};
+
+	argv[0] = lnet_debug_log_upcall;
+
+	LASSERTF(file, "called on a null filename\n");
+	argv[1] = file; /* only need to pass the path of the file */
+
+	argv[2] = NULL;
+
+	rc = call_usermodehelper(argv[0], argv, envp, 1);
+	if (rc < 0 && rc != -ENOENT) {
+		CERROR("Error %d invoking LNET debug log upcall %s %s; check /sys/kernel/debug/lnet/debug_log_upcall\n",
+		       rc, argv[0], argv[1]);
+	} else {
+		CDEBUG(D_HA, "Invoked LNET debug log upcall %s %s\n",
+		       argv[0], argv[1]);
+	}
+}
+
+void libcfs_run_upcall(char **argv)
+{
+	int   rc;
+	int   argc;
+	char *envp[] = {
+		"HOME=/",
+		"PATH=/sbin:/bin:/usr/sbin:/usr/bin",
+		NULL};
+
+	argv[0] = lnet_upcall;
+	argc = 1;
+	while (argv[argc])
+		argc++;
+
+	LASSERT(argc >= 2);
+
+	rc = call_usermodehelper(argv[0], argv, envp, 1);
+	if (rc < 0 && rc != -ENOENT) {
+		CERROR("Error %d invoking LNET upcall %s %s%s%s%s%s%s%s%s; check /sys/kernel/debug/lnet/upcall\n",
+		       rc, argv[0], argv[1],
+		       argc < 3 ? "" : ",", argc < 3 ? "" : argv[2],
+		       argc < 4 ? "" : ",", argc < 4 ? "" : argv[3],
+		       argc < 5 ? "" : ",", argc < 5 ? "" : argv[4],
+		       argc < 6 ? "" : ",...");
+	} else {
+		CDEBUG(D_HA, "Invoked LNET upcall %s %s%s%s%s%s%s%s%s\n",
+		       argv[0], argv[1],
+		       argc < 3 ? "" : ",", argc < 3 ? "" : argv[2],
+		       argc < 4 ? "" : ",", argc < 4 ? "" : argv[3],
+		       argc < 5 ? "" : ",", argc < 5 ? "" : argv[4],
+		       argc < 6 ? "" : ",...");
+	}
+}
+
+void libcfs_run_lbug_upcall(struct libcfs_debug_msg_data *msgdata)
+{
+	char *argv[6];
+	char buf[32];
+
+	snprintf(buf, sizeof(buf), "%d", msgdata->msg_line);
+
+	argv[1] = "LBUG";
+	argv[2] = (char *)msgdata->msg_file;
+	argv[3] = (char *)msgdata->msg_fn;
+	argv[4] = buf;
+	argv[5] = NULL;
+
+	libcfs_run_upcall(argv);
+}
+EXPORT_SYMBOL(libcfs_run_lbug_upcall);
+
+/* coverity[+kill] */
+void __noreturn lbug_with_loc(struct libcfs_debug_msg_data *msgdata)
+{
+	libcfs_catastrophe = 1;
+	libcfs_debug_msg(msgdata, "LBUG\n");
+
+	if (in_interrupt()) {
+		panic("LBUG in interrupt.\n");
+		/* not reached */
+	}
+
+	dump_stack();
+	if (!libcfs_panic_on_lbug)
+		libcfs_debug_dumplog();
+	libcfs_run_lbug_upcall(msgdata);
+	if (libcfs_panic_on_lbug)
+		panic("LBUG");
+	set_task_state(current, TASK_UNINTERRUPTIBLE);
+	while (1)
+		schedule();
+}
+EXPORT_SYMBOL(lbug_with_loc);
+
+static int panic_notifier(struct notifier_block *self, unsigned long unused1,
+			  void *unused2)
+{
+	if (libcfs_panic_in_progress)
+		return 0;
+
+	libcfs_panic_in_progress = 1;
+	mb();
+
+	return 0;
+}
+
+static struct notifier_block libcfs_panic_notifier = {
+	.notifier_call	= panic_notifier,
+	.next		= NULL,
+	.priority	= 10000,
+};
+
+void libcfs_register_panic_notifier(void)
+{
+	atomic_notifier_chain_register(&panic_notifier_list,
+				       &libcfs_panic_notifier);
+}
+
+void libcfs_unregister_panic_notifier(void)
+{
+	atomic_notifier_chain_unregister(&panic_notifier_list,
+					 &libcfs_panic_notifier);
+}