manuals: Fix "skipping end of block" .El errors

These were reported by `mandoc -T lint ...` as errors; this commit only
handles unnecessary .El commands.

The rendered output (in ascii and html) is

manuals: Fix "skipping end of block" .El errors

These were reported by `mandoc -T lint ...` as errors; this commit only
handles unnecessary .El commands.

The rendered output (in ascii and html) is not affected by this commit.

Signed-off-by: Graham Percival <gperciva@tarsnap.com>
Reviewed by: mhorne
MFC after: 3 days
Sponsored by: Tarsnap Backup Inc.
Pull Request: https://github.com/freebsd/freebsd-src/pull/1447

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zfsd: Use vdev prop values for fault/degrade thresholds

ZED uses vdev props for setting disk fault/degrade thresholds, this
patch enables zfsd to use the same vdev props for these same tasks.

OpenZ

zfsd: Use vdev prop values for fault/degrade thresholds

ZED uses vdev props for setting disk fault/degrade thresholds, this
patch enables zfsd to use the same vdev props for these same tasks.

OpenZFS on Linux is using vdev props for ZED disk fault/degrade
thresholds. Originally the thresholds supported were for io and checksum
events and recently this was updated to process slow io events as
well, see
https://github.com/openzfs/zfs/commit/cbe882298e4ddc3917dfaf239eca475fe06d62d4

This patch enables us to use the same vdev props in zfsd as ZED uses.
After this patch is merged both OSs will use the same vdev props to set
retirement thresholds.

It's probably important to note that the threshold defaults are
different between OS. I've kept the existing defaults inside zfsd and
DID NOT match them to what ZED does.

Differential Revision: https://reviews.freebsd.org/D44043
MFC after: 2 weeks
Relnotes: yes
Reviewed by: asomers, allanjude
Sponsored by: Axcient
Submitted by: Alek Pinchuk <apinchuk@axcient.com>

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Remove $FreeBSD$: two-line nroff pattern

Remove /^\.\\"\n\.\\"\s*\$FreeBSD\$$\n/

zfsd.8: fix orphan .Xr

Though ZFS is a kernel module, it has no man page in section 4.

Reported by: phk
MFC after: 2 weeks

zfsd(8), the ZFS fault management daemon

Add zfsd, which deals with hard drive faults in ZFS pools. It manages
hotspares and replements in drive slots that publish physical paths.

cddl/usr.sbin/zfs

zfsd(8), the ZFS fault management daemon

Add zfsd, which deals with hard drive faults in ZFS pools. It manages
hotspares and replements in drive slots that publish physical paths.

cddl/usr.sbin/zfsd
Add zfsd(8) and its unit tests

cddl/usr.sbin/Makefile
Add zfsd to the build

lib/libdevdctl
A C++ library that helps devd clients process events

lib/Makefile
share/mk/bsd.libnames.mk
share/mk/src.libnames.mk
Add libdevdctl to the build. It's a private library, unusable by
out-of-tree software.

etc/defaults/rc.conf
By default, set zfsd_enable to NO

etc/mtree/BSD.include.dist
Add a directory for libdevdctl's include files

etc/mtree/BSD.tests.dist
Add a directory for zfsd's unit tests

etc/mtree/BSD.var.dist
Add /var/db/zfsd/cases, where zfsd stores case files while it's shut
down.

etc/rc.d/Makefile
etc/rc.d/zfsd
Add zfsd's rc script

sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev.c
Fix the resource.fs.zfs.statechange message. It had a number of
problems:

It was only being emitted on a transition to the HEALTHY state.
That made it impossible for zfsd to take actions based on drives
getting sicker.

It compared the new state to vdev_prevstate, which is the state that
the vdev had the last time it was opened. That doesn't make sense,
because a vdev can change state multiple times without being
reopened.

vdev_set_state contains logic that will change the device's new
state based on various conditions. However, the statechange event
was being posted _before_ that logic took effect. Now it's being
posted after.

Submitted by: gibbs, asomers, mav, allanjude
Reviewed by: mav, delphij
Relnotes: yes
Sponsored by: Spectra Logic Corp, iX Systems
Differential Revision: https://reviews.freebsd.org/D6564

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