Switch the defaults to not split the RLIMIT_STACK-sized initial thread
stack into the stacks of the created threads.  Add knob
LIBPTHREAD_SPLITSTACK_MAIN to restore the older behaviour.

Sponsored by:	The FreeBSD Foundation
MFC after:	3 weeks
Expand the libthr(3) manpage to document knobs accepted by libthr.so
and explain some internal working of the library, neccessary to
understand the knobs effects.

Reviewed by:	bjk, pluknet
Sponsored by:	The FreeBSD Foundation
MFC after:	3 weeks
Fix ticks wrap issue of lowmem test in vm_pageout_scan

Reviewed by:	jhb (D818)
MFC after:	3 days
Sponsored by:	Multiplay
Fix the creation of the L2 cluster table for version 1. The blkofs
variable was assigned the image offset in bytes and not in blocks
(i.e. sectors). This had image_data() return FALSE, which meant that
we didn't assign a cluster when we needed and also meant that we
didn't write parts of the L2 table when we should have. The result
being that the actual data clusters were written at the wrong offset.

Improve support for QCOW version 2. We're having the right layout
and even know how many refcnt blocks we need. All we need to do is
populate the refcnt blocks for every cluster we write and allocate
a cluster when we need a new refcnt block. The allocation part is
tricky in that it'll interleave with the assignment of clusters to
L2 tables and data. Since version 2 is not quite done, keep it
compiled out for now.
Update the baseline for QCOW version 1. A bug was found that rendered
the baseline invalid.
Merge apr-util 1.5.3 -> 1.5.4.  A minor bug fix update.
cxgbe/tom:  Catch up with r271119, syncache_add doesn't need tcbinfo lock.
Update comment (missed this bit in r272079).
Catch up with r271119.
Expect ELOOP on Darwin/Linux with "O_NOFOLLOW was specified and the target is a
symbolic link" case. Assume EMLINK on the rest of the OSes (FreeBSD, Solaris,
etc)

MFC after: 2 weeks
X-MFC with: r272057
Sponsored by: EMC / Isilon Storage Division
Fix the executed testplan count

MFC after: 2 weeks
X-MFC with: r272057
Sponsored by: EMC / Isilon Storage Division
Add myself (jch) to calendar.freebsd and committers-src.dot

Approved by:	jhb (mentor)
Finish QCOW version 2 and stop making it conditional.

We have a different ordering for the RC block(s) and L2 tables.
This is expected to be a non-issue, because everything is found
through file offsets in the corresponding RC table and L1 table.
Files that grow organically have RC blocks and L2 tables scattered
all over the place anyway.

The reason for the difference is that mkimg needs to be able to
write to a pipe. We can't seek forward and backward to fill in
the bits in non-sequential order.
Increase the memory disk size in the following testcases to avoid mount
failures, which would cause cascade failures in the rest of the test
run:

link/15.t, open/19.t, mkdir/11.t, mkfifo/11.t, symlink/11.t

Fail quickly in all of the testcases if mdconfig, mount, umount, etc
fails to avoid issues similar to this in the future

Submitted by: Casey Peel <cpeel@isilon.com>
MFC after: 2 weeks
X-MFC with: r272057
Sponsored by: EMC / Isilon Storage Division
Add baseline files for QCOW2.
Fix NULL pointer deref in ipfw when using dummynet at layer 2.
Drop packet if pkg->ifp is NULL, which is the case here.

ref. https://github.com/HardenedBSD/hardenedBSD
commit 4eef3881c64f6e3aa38eebbeaf27a947a5d47dd7

PR 193861 --  DUMMYNET LAYER2: kernel panic

in this case a kernel panic occurs. Hence, when we do not get an interface,
we just drop the packet in question.

PR:		193681
Submitted by:	David Carlier <david.carlier@hardenedbsd.org>
Obtained from:	Hardened BSD
MFC after:	2 weeks
Relnotes:	yes
- Provide mxge_get_counter() to return counters that are not collected,
  but taken from hardware.
- Mechanically convert to if_inc_counter() the rest of counters.
Whitespace cleanup.
Run through unifdef(1) with slight hand-editing after. It is obvious,
that the driver is not going to be ever improved in terms of hardware
support, it is going to be only maintained as our kernel APIs change.
Carrying all the compatibility with ancient versions of NetBSD, OpenBSD,
Linux and BSDI, as well as obsoleted FreeBSD versions has no reason.
- Provide lmc_get_counter() to return counters that are not collected,
  but taken from hardware.
- Mechanically convert to if_inc_counter() the rest of counters.