- Skip over the testcases that call cbrtl on platforms where LDBL_PREC == 53
(arm, mips, powerpc). This fixes the build on these platforms, based on some
ad hoc tinderbox runs I did a while ago
- Skip cast the arguments to powl as long double so powl properly interprets
those arugments at compile-time when picking the type

Sponsored by: EMC / Isilon Storage Division
Do not do a cache invalidate on a PREREAD sync that is also a PREWRITE sync.
The PREWRITE handling does a writeback of any dirty cachelines, so there's
no danger of an eviction during the DMA corrupting the buffer.  There will
be an invalidate done during POSTREAD, so doing it before the read too is
wasted time.
Do the cache invalidate sequence from the outermost to innermost, required
for correct operation.

Submitted by:	Michal Meloun <meloun@miracle.cz>
Correct the sequence of busdma sync ops involved with PRE/POSTREAD syncs.

We used to invalidate the cache for PREREAD alone, or writeback+invalidate
for PREREAD with PREWRITE, then treat POSTREAD as a no-op.  Prefetching on
modern systems can lead to parts of a DMA buffer getting pulled into the
caches while DMA is in progress (due to access of "nearby" data), so it's
mandatory to invalidate during the POSTREAD sync even if a PREREAD
invalidate also happened.

In the PREREAD case the invalidate is done to ensure that there are no
dirty cache lines that might get automatically evicted during the DMA,
corrupting the buffer.  In a PREREAD+PREWRITE case the writeback which is
required for PREWRITE handling is suffficient to avoid corruption caused
by eviction and no invalidate need be done until POSTREAD time.

Submitted by:	Michal Meloun <meloun@miracle.cz>
No functional changes.  Remove a couple outdated or inane comments and
add new comment blocks describing why the cache maintenance sequences are
done in the order they are for each case.
Add mv, echo and hostname to the native-xtools target.  Missed these
when profiling.

MFC after:	2 weeks
Finish r274175: do control plane MTU tracking.

Update route MTU in case of ifnet MTU change.
Add new RTF_FIXEDMTU to track explicitly specified MTU.

Old behavior:
ifconfig em0 mtu 1500->9000 -> all routes traversing em0 do not change MTU.
User has to manually update all routes.
ifconfig em0 mtu 9000->1500 -> all routes traversing em0 do not change MTU.
However, if ip[6]_output finds route with rt_mtu > interface mtu, rt_mtu
gets updated.

New behavior:
ifconfig em0 mtu 1500->9000 -> all interface routes in all fibs gets updated
with new MTU unless RTF_FIXEDMTU flag set on them.
ifconfig em0 mtu 9000->1500 -> all routes in all fibs gets updated with new
MTU unless RTF_FIXEDMTU flag set on them AND rt_mtu is less than ifp mtu.

route add ... -mtu XXX automatically sets RTF_FIXEDMTU flag.
route change .. -mtu 0 automatically removes RTF_FIXEDMTU flag.

PR:		194238
MFC after:	1 month
CR:		D1125
Add reachover Makefiles for contrib/netbsd-tests/lib/librt

A variant of this code has been tested on amd64/i386 for some time by
EMC/Isilon on 10-STABLE/11-CURRENT. It builds on other architectures, but the
code will remain off until it's proven it works on virtual hardware or real
hardware on other architectures

Sponsored by: EMC / Isilon Storage Division
Disable TRIM on file backed ZFS vdevs and fix TRIM on init

After r265152 TRIM requests are ZIO_TYPE_FREE instead of ZIO_TYPE_IOCTL
this meant file backed vdevs to attempted to process the ZIO as a write
causing a panic.

We now disable TRIM on file backed vdevs and ASSERT the ZIO types supported
by each vdev type to ensure we explicity support the ZIO type being
processed.

Also ensure that TRIM on init is not procesed for devices which declare they
didn't support TRIM via vdev_notrim.

PR:		195061, 194976, 191573
Sponsored by:	Multiplay
Revert r273630 as the panic was fixed by r274619

The panic was caused by TRIM requests run against file based vdevs as write
requests.

PR:		191573
Sponsored by:	Multiplay
The "intr" option is NFS-specific; fix examples in auto_master(5).

MFC after:	1 month
Sponsored by:	The FreeBSD Foundation
Mechanically replace #if defined(__FreeBSD__) and #if defined(__NetBSD__) with
their #ifdef equivalents for everything changed in contrib/netbsd-tests. There
are some items from the vendor tree that use #if defined(__FreeBSD__) or
#if defined(__NetBSD__) which are being left alone

Requested by: bde, rpaulo
Sponsored by: EMC / Isilon Storage Division
Revert r269093 which introduced physical zio alignment transform

Size of physical ZIOs must never be implicitly adjusted, it's
a responsibility of a caller to make sure that such a ZIO has proper offset
and size.

Discussed with:	delphij, gibbs
MFC after:	2 weeks
l2arc: restore correct rounding up of asize of compressed data

This rounding up was lost in a mismerge of illumos code.
See r268075 MFV r267565.
After that commit zio_compress_data() no longer performs any compressed
size adjustment, so it needs to be done externally.  On FreeBSD we round
up the size using vdev_ashift rather than SPA_MINBLOCKSIZE so that 4KB
devices are properly supported.

Additionally, zero out the buffer tail only if compression succeeds.
The compression is considered successful if the size of compressed
data after rounding up to account for the vdev ashift is less than the
original data size.  It does not make sense to have the data compressed
if all the savings are lost to rounding up.
With the new zio_compress_data() it could have been possible that the
rounded compressed size would be greater than the original size and thus
we could zero beyond the allocated buffer if the zeroing code was kept
at the original place.

Discussed with:	delphij, gibbs
MFC after:	2 weeks
X-MFC with:	r274627
Re-introduce padding fields removed with r264321 to keep
struct tcptw ABI unchanged.

Suggested by:	jhb
Approved by:	jhb (mentor)
MFC after:	1 day
X-MFC-With:	r264321
Add logic for detecting non-persistent filesystems being utilized by
workdir which would break the upgrade process upon reboot.

Currently we check for tmpfs and mdmfs.

PR:		195006
Differential Revision:	https://reviews.freebsd.org/D1163
Approved by:	cperciva
Fix geom's "usage" generation to not fabricate usage/help output for any
imaginary class we give it.

Differential Revision:	https://reviews.freebsd.org/D1150
Submitted by:	homerj
Approved by:	pjd
Clean up some language

Reviewed by:	will
Remove stray empty comment. The code is adequately explained in the
block comment above, so there's nothing to add here.
Use the correct device as the power_for_sleep() method
always pass request up to parent bridge.

Reviewed by:	jhb
MFC after:	1 week
xMFC:		r274386,r274397