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

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

Fix makefs bootstrap after d485c77f203fb0f4cdc08dea5ff81631b51d8809

The makefs msdosfs code includes fs/msdosfs/denode.h which directly uses
struct buf from <sys/buf.h> rather than the makefs struct m_buf.
To work around this problem provide a local denode.h that includes
ffs/buf.h and defines buf as an alias for m_buf.

Reviewed By: kib, emaste
Differential Revision: https://reviews.freebsd.org/D28835

Remove #define _KERNEL hacks from libprocstat

Make sys/buf.h, sys/pipe.h, sys/fs/devfs/devfs*.h headers usable in
userspace, assuming that the consumer has an idea what it is for.
Unhide more material from sys/mount.h and sys/ufs/ufs/inode.h,
sys/ufs/ufs/ufsmount.h for consumption of userspace tools, with the
same caveat.

Remove unacceptable hack from usr.sbin/makefs which relied on sys/buf.h
being unusable in userspace, where it override struct buf with its own
definition. Instead, provide struct m_buf and struct m_vnode and adapt
code to use local variants.

Reviewed by: mckusick
Tested by: pho
Sponsored by: The FreeBSD Foundation
Differential revision: https://reviews.freebsd.org/D28679

Properly update FSInfo block after generation.

After populating the filesystem, write a FSInfo block with
proper information.

Reviewed by: emaste, cem
MFC after: 2 weeks
Differential Revision: https://reviews.freebsd.org/D21363

makefs: add msdosfs (FAT) support

Add FAT support to makefs by copying some files from sys/fs/msdosfs/ and
updating others with changes from NetBSD.

The six files copied from sys/fs/msdosfs at r348251 and modified are:
denode.h direntry.h fat.h msdosfs_fat.c msdosfs_lookup.c msdosfsmount.h

I would prefer to avoid the duplication, but reluctance to doing so was
expressed in a previous review (D11197); for now copy the files and
revisit in the future.

Submitted by: Siva Mahadevan
Discussed with: cem, imp
MFC after: 1 month
Relnotes: Yes
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D16438

makefs: add copies of NetBSD makefs msdos source files

We do not treat makefs as contrib code. Import copies of makefs msdos
files from NetBSD so that we can track our changes to these files.

These are copied from NetBSD, with only a change to use __FBSDID and
$FreeBSD$ instead of __KERNEL_RCSID and $NetBSD$. A copy of the
original $NetBSD$ tag remains in each source file.

These two files were missed in r320212. Also remove a stray blank line
added in msdosfs_vfsops.c.

Submitted by: Siva Mahadevan
Sponsored by: The FreeBSD Foundation