It's possible when adding a jail that its dying parent comes back to
life.  Only allow that to happen when JAIL_DYING is specified.  And if
it does happen, call PR_METHOD_CREATE on it.

No need for "foo$(printf "\t")", $'\t' is both more readable and still
functional.

Reported-by:	Jamie Landeg-Jones <jamie@catflap.org>

vfs_cache_lookup() has already done the appropriate VEXEC check, therefore
we must not re-check in VOP_CACHEDLOOKUP.

This fixes O_SEARCH semantics on tmpfs and removes a redundant descent into
VOP_ACCESS() in the common case.

Reported-by:	arichardson (via CheriBSD Jenkins CI)
Reviewed-by:	kib
MFC-after:	3 days
Differential Revision:	https://reviews.freebsd.org/D28401

The current uname is branch-cXXXX-gHASH

Three changes to make uname more useful.
1. Move from using git rev-list --count to git rev-lis --count --first-parent
   since that gives a better, incrementing number.
2. Report this count as 'nXXXXX' rather than 'cXXXXX' because c is part of
   a hash and we've changed the sematnics of XXXXX
3. Remove g to make HASH cut and pastable.

Durting review, #1 & #3 had the largest consensus. There was a diversity of
opinion on #2, but on the whole it was positive so I'll acknowledge the dissent,
but move forward with something seems to have support since the dissent was all
about what letter to use where I chose 'n'.

MFC After: 3 days
Reviewed by: rgrimes, emaste (earlier version)
Differential Revision: https://reviews.freebsd.org/D28338

MFC after:	3 days

newer controller have a sparce bus space that can be figured
out by probing the HW.  This gives the starting bus number.
When reading the PCI config. space behind the VMD controller,
the offset of the starting bus needs to be subtracted from
the bus being read.

Fixed a bug in which in which not all of the devices
directly attached to the VMD controller would be probed.
On my initial test HW, a switch was found at bus 0, slot 0
and function 0.  All of the NVME drives were behind that
switch.  Now scan for all slots and functions attached to
bus 0.  If a something was found then run attach after the
scan.  On detach also go through all slots and functions
on bus 0.

Tested with device ID's: 0x201d & 0x9a0b

Tested by:	nc@
MFC after:	7 days
PR:		252253

Use hsctrl_load to load the module at boot time.

Submitted by:	Shunchao Hu <ankohuu_outlook.com>
Reviewed by:	wulf
MFC after:	3 days
Differential revision:	https://reviews.freebsd.org/D28343

Move software iSCSI tunables/sysctls into kern.icl.soft subtree.
Replace several hardcoded length constants there with variables.

While there, stretch the limits to better match Linux' open-iscsi
and our own initiator with new MAXPHYS of 1MB.  Our CTL target is
also optimized for up to 1MB I/Os, so there is also a match now.
For Windows 10 and VMware 6.7 initiators at default settings it
should make no change, since previous limits were sufficient there.

Tests of QD1 1MB writes from FreeBSD over 10GigE link show throughput
increase by 29% on idle connection and 132% with concurrent QD8 reads.

MFC after:	3 days
Sponsored by:	iXsystems, Inc.

armeb and pc98 were both discontinued after FreeBSD 11.  FreeBSD 11.4
is now known to be the final 11.x release, so update to the specific
version.