Revert r330897:

This was intended to be a non-functional change. It wasn't. The commit
message was thus wrong. In addition it broke arm, and merged crypto
related code.

Revert with prejudice.

This revert skips files touched in r316370 since that commit was since
MFCed. This revert also skips files that require $FreeBSD$ property
changes.

Thank you to those who helped me get out of this mess including but not
limited to gonzo, kevans, rgrimes.

Requested by: gjb (re)

Partial merge of the SPDX changes

These changes are incomplete but are making it difficult
to determine what other changes can/should be merged.

No objections from: pfg

Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

libufs: Simplify generation number calculation.

UFS generation numbers have been unsigned since 2013 (r256435).

Search beyond the first 1/8th of inodes.

Submitted by: jeff

- Merge soft-updates journaling from projects/suj/head into head. This
brings in support for an optional intent log which eliminates the need
for background fsck on unclean shutdown.

Sponsored by: iXsystems, Yahoo!, and Juniper.
With help from: McKusick and Peter Holm

Keep Tinderbox happy.

Implement cgwrite1(3) function which stored a given cylinder group on disk.

Sponsored by: home.pl

Reduce diffs with code in Perforce:
Parenthesise return values.

Store not only the current cylinder group in the series (i.e. next that needs
to be read in) but also the last cylinder group in the series (i.e. what is
stored in the structure).

Add facility to read one, or a string of, cylinger groups.