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

Remove /^\s*#[#!]?\s*\$FreeBSD\$.*$\n/

Remove /^[\s*]*__FBSDID\("\$FreeBSD\$"\);?\s*\n/

Remove /^\s*\*\n \*\s+\$FreeBSD\$$\n/

beadm will recursively promote deep BE datasets. In order to match the
beadm behavior, we need to recursively iterate over child filesystems
and promote them along the way.

This patch further refines the work from D40903, completing the fix for
promotion.

Reviewed by:	kevans, rew
Sponsored by:	Rubicon Communications, LLC ("Netgate")
Differential Revision:	https://reviews.freebsd.org/D40972

This matches the beadm behavior; generally, we need to keep promoting
until the BE is no longer a clone from a snapshot.  This fixes scenarios
where the dataset associated with a BE's origin is itself a clone,
activating the BE previously would promote it to a clone of the origin's
origin.

We could keep using be_get_dataset_props here, except for two
annoyances:

1.) I couldn't find a clean way to just clear an nvlist rather than
    having to re-alloc it, and I didn't want to just remove the one prop
    we're inspecting out of it.

2.) That's a lot of overhead when all we want to do is fetch the origin
    anyways.

Note that this is not a complete fix, but it does fix the majority of
cases; deep BE subordinates are still notably broken, pending a patch
from Christian.

Reported by:	R. Christian McDonald <rcm@rcm.sh>
Reviewed by:	rew
Differential Revision:	https://reviews.freebsd.org/D40903

As noted in the comment, we already know the rest of libbe_init() will
fail because there's no pool imported.  Avoid the side effect by
checking beforehand and bailing out early.

With this, freebsd-update(8) should no longer trigger a load of the zfs
kmod just because it runs `bectl check`.

Reviewed by:	jwmaag_gmail.com, rew
Differential Revision:	https://reviews.freebsd.org/D36188

The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch
up to that fact and revert to their recommended match of BSD-2-Clause.

Discussed with:		pfg
MFC After:		3 days
Sponsored by:		Netflix

Notable upstream pull request merges:

  #11680 Add support for zpool user properties
  #14145 Storage device expansion "silently" fails on degraded vdev
  #14405 Create zap for root vdev
  #14659 Allow MMP to bypass waiting for other threads
  #14674 Miscellaneous FreBSD compilation bugfixes
  #14692 Fix some signedness issues in arc_evict()
  #14702 Fix typo in check_clones()
  #14715 module: small fixes for FreeBSD/aarch64
  #14716 Trim needless zeroes from checksum events
  #14719 vdev: expose zfs_vdev_max_ms_shift as a module parameter
  #14722 Fix "Detach spare vdev in case if resilvering does not happen"
  #14723 freebsd clone range fixes
  #14728 Fix BLAKE3 aarch64 assembly for FreeBSD and macOS
  #14735 Fix in check_filesystem()
  #14739 Fix data corruption when cloning embedded blocks
  #14758 Fix VERIFY(!zil_replaying(zilog, tx)) panic
  #14761 Revert "ZFS_IOC_COUNT_FILLED does unnecessary txg_wait_synced()"
  #14774 FreeBSD .zfs fixups
  #14776 FreeBSD: make zfs_vfs_held() definition consistent with declaration
  #14779 powerpc64: Support ELFv2 asm on Big Endian
  #14788 FreeBSD: add missing vop_fplookup assignments
  #14789 PAM: support the authentication facility
  #14790 Revert "Fix data race between zil_commit() and zil_suspend()"
  #14795 Fix positive ABD size assertion in abd_verify()
  #14798 Mark TX_COMMIT transaction with TXG_NOTHROTTLE
  #14804 Correct ABD size for split block ZIOs
  #14806 Use correct block pointer in block cloning case.
  #14808 blake3: fix up bogus checksums in face of cpu migration

Obtained from:	OpenZFS
OpenZFS commit:	d96e29576c89e6e547cb82b477651d2b85ea0fed