1 files changed, 101 insertions, 0 deletions
diff --git a/fs/xfs/support/ktrace.h b/fs/xfs/support/ktrace.h
new file mode 100644
index 000000000000..92d1a1a5d04b
--- /dev/null
+++ b/fs/xfs/support/ktrace.h
@@ -0,0 +1,101 @@
+/*
+ * Copyright (c) 2000-2003 Silicon Graphics, Inc.  All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * Further, this software is distributed without any warranty that it is
+ * free of the rightful claim of any third person regarding infringement
+ * or the like.  Any license provided herein, whether implied or
+ * otherwise, applies only to this software file.  Patent licenses, if
+ * any, provided herein do not apply to combinations of this program with
+ * other software, or any other product whatsoever.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write the Free Software Foundation, Inc., 59
+ * Temple Place - Suite 330, Boston MA 02111-1307, USA.
+ *
+ * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
+ * Mountain View, CA  94043, or:
+ *
+ * http://www.sgi.com
+ *
+ * For further information regarding this notice, see:
+ *
+ * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
+ */
+#ifndef __XFS_SUPPORT_KTRACE_H__
+#define __XFS_SUPPORT_KTRACE_H__
+
+#include <spin.h>
+
+/*
+ * Trace buffer entry structure.
+ */
+typedef struct ktrace_entry {
+	void	*val[16];
+} ktrace_entry_t;
+
+/*
+ * Trace buffer header structure.
+ */
+typedef struct ktrace {
+	lock_t		kt_lock;	/* mutex to guard counters */
+	int		kt_nentries;	/* number of entries in trace buf */
+	int		kt_index;	/* current index in entries */
+	int		kt_rollover;
+	ktrace_entry_t	*kt_entries;	/* buffer of entries */
+} ktrace_t;
+
+/*
+ * Trace buffer snapshot structure.
+ */
+typedef struct ktrace_snap {
+	int		ks_start;	/* kt_index at time of snap */
+	int		ks_index;	/* current index */
+} ktrace_snap_t;
+
+
+#ifdef CONFIG_XFS_TRACE
+
+extern void ktrace_init(int zentries);
+extern void ktrace_uninit(void);
+
+extern ktrace_t *ktrace_alloc(int, int);
+extern void ktrace_free(ktrace_t *);
+
+extern void ktrace_enter(
+	ktrace_t	*,
+	void		*,
+	void		*,
+	void		*,
+	void		*,
+	void		*,
+	void		*,
+	void		*,
+	void		*,
+	void		*,
+	void		*,
+	void		*,
+	void		*,
+	void		*,
+	void		*,
+	void		*,
+	void		*);
+
+extern ktrace_entry_t   *ktrace_first(ktrace_t *, ktrace_snap_t *);
+extern int              ktrace_nentries(ktrace_t *);
+extern ktrace_entry_t   *ktrace_next(ktrace_t *, ktrace_snap_t *);
+extern ktrace_entry_t   *ktrace_skip(ktrace_t *, int, ktrace_snap_t *);
+
+#else
+#define ktrace_init(x)	do { } while (0)
+#define ktrace_uninit()	do { } while (0)
+#endif	/* CONFIG_XFS_TRACE */
+
+#endif	/* __XFS_SUPPORT_KTRACE_H__ */