sys: Remove $FreeBSD$: one-line .c pattern

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

spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD

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

MFV: zstd 1.5.2

Merge commit 'b3392d84da5bf2162baf937c77e0557f3fd8a52b' into zstd_1.5.2

full changelog: https://github.com/facebook/zstd/compare/v1.4.8...v1.5.2

Updated sys/kern/subr_compressor.c to new API

MFC after: 3 days
Relnotes: yes
Sponsored by: Klara, Inc.

Fix gzip compressed core dumps on big endian architectures

The gzip trailer words (size and CRC) are both little-endian per the spec.

MFC after: 3 days
Sponsored by: Juniper Networks, Inc.

clamp kernel dump compression level when using gzip

If the configured compression level for kernel dumps
it outside the supported range, clamp it to the closest
supported level. Previously, dumpon would fail.

zstd already does this internally, so the compressor
needs no change.

Reviewed by: cem markj
MFC after: 2 weeks
Sponsored by: Dell EMC Isilon
Differential Revision: https://reviews.freebsd.org/D23765

GZIO: Update to use zlib 1.2.11.

PR: 229763
Submitted by: Yoshihiro Ota <ota j email ne jp>
Differential Revision: https://reviews.freebsd.org/D21408

Separate kernel crc32() implementation to its own header (gsb_crc32.h) and
rename the source to gsb_crc32.c.

This is a prerequisite of unifying kernel zlib instances.

PR: 229763
Submitted by: Yoshihiro Ota <ota at j.email.ne.jp>
Differential Revision: https://reviews.freebsd.org/D20193

Update to Zstandard 1.3.8

This merge brings in a couple new files, which needed to be attached to the
build; a new dependency on <limits.h>, which must be stubbed; and a name
change in the Context parameter constants, from ZSTD_p_foo to ZSTD_c_foo.

Significantly, it fixes a kernel build error with GCC where floating-point
functions were included in the kernel build, by hiding them under the same
compile-time #ifdef that already covered their invocation. That issue was
introduced to FreeBSD in the 1.3.7 update and tracked upstream here:

https://github.com/facebook/zstd/issues/1386

The full 1.3.8 release notes can be found on Github:

https://github.com/facebook/zstd/releases/tag/v1.3.8

Relnotes: yes

ZSTDIO: Correctly initialize zstd context with provided 'level'

Prior to this revision, we allocated sufficient context space for 'level'
but never actually set the compress level parameter, so we would always get
the default '3'.

Reviewed by: markj, vangyzen
MFC after: 12 hours
Sponsored by: Dell EMC Isilon
Differential Revision: https://reviews.freebsd.org/D17144

Fix the test for SET_FOREACH termination.

Unlike the queue(3) _FOREACH macros, the iterator for a SET_FOREACH is
not NULL after the end of the set is reached.

Add support for zstd-compressed user and kernel core dumps.

This works similarly to the existing gzip compression support, but
zstd is typically faster and gives better compression ratios.

Support for this functionality must be configured by adding ZSTDIO to
one's kernel configuration file. dumpon(8)'s new -Z option is used to
configure zstd compression for kernel dumps. savecore(8) now recognizes
and saves zstd-compressed kernel dumps with a .zst extension.

Submitted by: cem (original version)
Relnotes: yes
Sponsored by: Dell EMC Isilon
Differential Revision: https://reviews.freebsd.org/D13101,
https://reviews.freebsd.org/D13633

Generalize the gzio API.

We currently use a set of subroutines in kern_gzio.c to perform
compression of user and kernel core dumps. In the interest of adding
support for other compression algorithms (zstd) in this role without
complicating the API consumers, add a simple compressor API which can be
used to select an algorithm.

Also change the (non-default) GZIO kernel option to not enable
compressed user cores by default. It's not clear that such a default
would be desirable with support for multiple algorithms implemented,
and it's inconsistent in that it isn't applied to kernel dumps.

Reviewed by: cem
Differential Revision: https://reviews.freebsd.org/D13632

Fix gzip compressed core dumps on big endian architectures

The gzip trailer words (size and CRC) are both little-endian per the spec.

MFC after: 3 days
Sponsored by: Juniper Networks, Inc.

clamp kernel dump compression level when using gzip

If the configured compression level for kernel dumps
it outside the supported range, clamp it to the closest
supported level. Previously, dumpon would fail.

zstd already does this internally, so the compressor
needs no change.

Reviewed by: cem markj
MFC after: 2 weeks
Sponsored by: Dell EMC Isilon
Differential Revision: https://reviews.freebsd.org/D23765

GZIO: Update to use zlib 1.2.11.

PR: 229763
Submitted by: Yoshihiro Ota <ota j email ne jp>
Differential Revision: https://reviews.freebsd.org/D21408

Separate kernel crc32() implementation to its own header (gsb_crc32.h) and
rename the source to gsb_crc32.c.

This is a prerequisite of unifying kernel zlib instances.

PR: 229763
Submitted by: Yoshihiro Ota <ota at j.email.ne.jp>
Differential Revision: https://reviews.freebsd.org/D20193

ZSTDIO: Correctly initialize zstd context with provided 'level'

Prior to this revision, we allocated sufficient context space for 'level'
but never actually set the compress level parameter, so we would always get
the default '3'.

Reviewed by: markj, vangyzen
MFC after: 12 hours
Sponsored by: Dell EMC Isilon
Differential Revision: https://reviews.freebsd.org/D17144

Fix the test for SET_FOREACH termination.

Unlike the queue(3) _FOREACH macros, the iterator for a SET_FOREACH is
not NULL after the end of the set is reached.

Add support for zstd-compressed user and kernel core dumps.

This works similarly to the existing gzip compression support, but
zstd is typically faster and gives better compression ratios.

Support for this functionality must be configured by adding ZSTDIO to
one's kernel configuration file. dumpon(8)'s new -Z option is used to
configure zstd compression for kernel dumps. savecore(8) now recognizes
and saves zstd-compressed kernel dumps with a .zst extension.

Submitted by: cem (original version)
Relnotes: yes
Sponsored by: Dell EMC Isilon
Differential Revision: https://reviews.freebsd.org/D13101,
https://reviews.freebsd.org/D13633

Generalize the gzio API.

We currently use a set of subroutines in kern_gzio.c to perform
compression of user and kernel core dumps. In the interest of adding
support for other compression algorithms (zstd) in this role without
complicating the API consumers, add a simple compressor API which can be
used to select an algorithm.

Also change the (non-default) GZIO kernel option to not enable
compressed user cores by default. It's not clear that such a default
would be desirable with support for multiple algorithms implemented,
and it's inconsistent in that it isn't applied to kernel dumps.

Reviewed by: cem
Differential Revision: https://reviews.freebsd.org/D13632