sys: Remove $FreeBSD$: two-line .h pattern

Remove /^\s*\*\n \*\s+\$FreeBSD\$$\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spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD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

spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD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

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sys/fs: further adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error

sys/fs: further adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.

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MFH

Sponsored by: The FreeBSD Foundation

Cleanup unnecessary semicolons from the kernel.

Found with devel/coccinelle.

Merge sync of head

Merge from HEAD

Merge ^/head r277945 through r277955.

Fix a -Wcast-qual warning in smbfs_subr.c, by using __DECONST. No
functional change.

MFC after: 3 days

Merge fresh head.

Sync with HEAD.

IFC @r243836

MFC

Until now, smbfs_fullpath() computed the full path starting from the
vnode and following back the chain of n_parent pointers up to the root,
without acquiring the locks of the n_parent vnodes analyze

Until now, smbfs_fullpath() computed the full path starting from the
vnode and following back the chain of n_parent pointers up to the root,
without acquiring the locks of the n_parent vnodes analyzed during the
computation. This is immediately wrong because if the vnode lock is not
held there's no guarantee on the validity of the vnode pointer or the data.
In order to fix, store the whole path in the smbnode structure so that
smbfs_fullpath() can use this information.

Discussed with: kib
Reported and tested by: pho
Sponsored by: iXsystems inc.

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IFC @ r242684

Sync from head

Fix panic due to page faults while in kernel mode, under conditions of
VM pressure. The reason is that in some codepaths pointers to stack
variables were passed from one thread to another.

In collab

Fix panic due to page faults while in kernel mode, under conditions of
VM pressure. The reason is that in some codepaths pointers to stack
variables were passed from one thread to another.

In collaboration with: pho
Reported by: pho's stress2 suite
Sponsored by: iXsystems inc.

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IFC @230489 (pending review).

IFC @ r227804

Pull in the virtio drivers from head.

Add unicode support to msdosfs and smbfs; original pathes from imura,
bug fixes by Kuan-Chung Chiu <buganini at gmail dot com>.

Tested by me in production for several days at work.

Update to current version of head.

Merge svn+ssh://svn.freebsd.org/base/head@206571

Switch to our preferred 2-clause BSD license.

Approved by: bp

Ditch crummy fattime <--> timespec conversion functions

Since DELAY() was moved, most <machine/clock.h> #includes have been
unnecessary.