Enable some previously-disabled DTrace tests for umod, ufunc and usym. They
expect the installed ksh binary to be named "ksh", which is not the case
when it's installed on FreeBSD via the shells/ksh93 port. Allow for it to be
"ksh93" as well so that the tests can actually pass.
ext2fs: add two new reserved inodes.

According to online documentation [1], Ext4 has two new "special"
inodes so add the new exclude and replica inodes.

Reference:
[1] https://ext4.wiki.kernel.org/index.php/Ext4_Disk_Layout

Reported by:	Mike Ma
MFC after:	3 weeks
Turn 'n' into a local variable.  This is required for additional changes.

Submitted by:	Sebastian Huber <sebastian.huber@embedded-brains.de>
Add const qualifier where appropriate

Submitted by:	Sebastian Huber <sebastian.huber@embedded-brains.de>
Add const qualifier where appropriate

Submitted by:	Sebastian Huber <sebastian.huber@embedded-brains.de>
Avoid using a static buffer in atalk_ntoa.  This will help allow users to call route(1) as a library.

Submitted by:	Sebastian Huber <sebastian.huber@embedded-brains.de> (older version)
Discussed on:	-hackers
Reviwed by:	adri (different older version)
Add "null" backend to mdconfig(8).  This does exactly what the name
suggests, and is somewhat useful for benchmarking.

MFC after:	1 month
No objections from:	kib
Sponsored by:	The FreeBSD Foundation
Update release notes.

Submitted by: skreuzer
Change comment to match code.

Discussed with:	thompsa
Sponsored by:	The FreeBSD Foundation
Fix external compiler warning(s). Avoid pointer dereferencing.
Fix what looks like a typo after r258732.
3580 Want zvols to return volblocksize when queried for physical block size

illumos/illumos-gate@a0b60564dfc644f4bfaef1ce26d343b44cf68bc5
4188 assertion failed in dmu_tx_hold_free(): dn_datablkshift != 0

illumos/illumos-gate@bb411a08b05466bfe0c7095b6373bbc1587e259a
Add missing period for WITHOUT_PKGBOOTSTRAP so that it matches all
other entries.

Approved by:	bapt
MFC after:	3 days
Regenerate after r258924

MFC after:	3 days
Approved by:	bapt (implicit)
Regenerate after r258838
Fix a regression introduced by SVN r257842 that prevents Encryption from
being enabled.

MFC after:	3 days
Rename sysctl kern.supported_abis to kern.supported_archs, since it gives
the set of MACHINE_ARCH values that can be run.
drm: Read PCIER_LINK_CAP/PCIER_LINK_CAP2 from the PCI bridge

Before this fix, capabilities were read from vgapci and were incorrect.
Add missing bits from the vendor's 2005-05-04 change to
contrib/byacc/makefile.in ("add YYPATCH here so it can be tested by
applications") so that applications have a hope of detecting newer
FreeBSD YACC output from an older one.

Submitted by: Juniper Networks