src/sys/dev/filemon, branch upstream/11.1.0

MFC r304008:

2016-08-19T17:02:14+00:00

  Avoid taking PROC_LOCK in syscalls if not being traced.

Cleanup COMPAT_FREEBSD32 support.

2016-06-05T18:16:33+00:00

This is a NOP.

The COMPAT_IA32 was renamed in r205014 to COMPAT_FREEBSD32 and
COMPAT_ARCH32 does not seem to have existed.  Also remove some
leftovers from the sysent rework in r301404.  Include
freebsd32_util.h for the freebsd32_sysent prototype.

X-MFC-With:	r301404
Reported by:	kib
MFC after:	3 days
Sponsored by:	EMC / Isilon Storage Division

Fix build after r301404.

2016-06-04T23:34:51+00:00

X-MFC-With:	r301404
MFC after:	1 week

Support all architectures by just using sysent.

2016-06-04T17:39:42+00:00

PowerPC64 has two different ABIs, neither of which is elf64_freebsd_sysvec.
Using sysent and freebsd32_sysent achieves the same effect.

X-MFC-With:	r301130
MFC after:	1 week
Sponsored by:	EMC / Isilon Storage Division

Don't truncate existing error when writing the log.

2016-05-27T23:58:00+00:00

Suggested by:	markj
MFC after:	2 weeks
Sponsored by:	EMC / Isilon Storage Division

Rename function to be less generic.

2016-05-27T23:57:57+00:00

MFC after:	2 weeks
Sponsored by:	EMC / Isilon Storage Division

Write to the log using the tracer's credentials.

2016-05-27T23:57:53+00:00

MFC after:	2 weeks
Sponsored by:	EMC / Isilon Storage Division

exec: Cease tracing if credentials will change with the new image.

2016-05-27T23:57:43+00:00

This also prevents tracing to a P_INEXEC process since it could race
with other processes attaching to it in filemon_event_process_exec() due
to the filemon_get_proc() race of incrementing ref and then locking the
filemon.  With the no-P_INEXEC invariant in place the p_filemon may only
be the same or NULL when trying to drop it in
filemon_event_process_exec().

MFC after:	2 weeks
Sponsored by:	EMC / Isilon Storage Division
Differential Revision:	https://reviews.freebsd.org/D6545

filemon exec: Use imgp->execpath rather than vn_fullpath(9).

2016-05-26T23:27:08+00:00

This will be more accurate as the actual name is provided if ran
from an absolute path in do_execve().

MFC after:	2 weeks
Sponsored by:	EMC / Isilon Storage Division

Remove unneeded return left from refactoring.

2016-03-25T00:14:56+00:00

MFC after:	2 weeks
Sponsored by:	EMC / Isilon Storage Division