/usr/src/zfs-0.7.5/include/sys/trace.h is in zfs-dkms 0.7.5-1ubuntu15.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
#if defined(_KERNEL) && defined(HAVE_DECLARE_EVENT_CLASS)
#undef TRACE_SYSTEM
#define TRACE_SYSTEM zfs
#if !defined(_TRACE_ZFS_H) || defined(TRACE_HEADER_MULTI_READ)
#define _TRACE_ZFS_H
#include <linux/tracepoint.h>
#include <sys/types.h>
/*
* The sys/trace_dbgmsg.h header defines tracepoint events for
* dprintf(), dbgmsg(), and SET_ERROR().
*/
#define _SYS_TRACE_DBGMSG_INDIRECT
#include <sys/trace_dbgmsg.h>
#undef _SYS_TRACE_DBGMSG_INDIRECT
/*
* Redefine the DTRACE_PROBE* functions to use Linux tracepoints
*/
#undef DTRACE_PROBE1
#define DTRACE_PROBE1(name, t1, arg1) \
trace_zfs_##name((arg1))
#undef DTRACE_PROBE2
#define DTRACE_PROBE2(name, t1, arg1, t2, arg2) \
trace_zfs_##name((arg1), (arg2))
#undef DTRACE_PROBE3
#define DTRACE_PROBE3(name, t1, arg1, t2, arg2, t3, arg3) \
trace_zfs_##name((arg1), (arg2), (arg3))
#undef DTRACE_PROBE4
#define DTRACE_PROBE4(name, t1, arg1, t2, arg2, t3, arg3, t4, arg4) \
trace_zfs_##name((arg1), (arg2), (arg3), (arg4))
#endif /* _TRACE_ZFS_H */
#undef TRACE_INCLUDE_PATH
#undef TRACE_INCLUDE_FILE
#define TRACE_INCLUDE_PATH sys
#define TRACE_INCLUDE_FILE trace
#include <trace/define_trace.h>
#endif /* _KERNEL && HAVE_DECLARE_EVENT_CLASS */
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