Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

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

MFC r242511: Print a newline after the error message.

PR: bin/168447

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

Fix some style(9), although there's a lot more issues here.
Fix some casting errors.

PR: 142384
Submitted by: giffunip at tutopia dot com
Obtained from: NetBSD
MFC after: 3 weeks

Rename fields to match better the msdosfs headers. This work is still
incomplete as some info doesn't really belong to the structs where it is
defined.

Submitted by: Pedro F. Giffuni <giffunip tutopia com>
Reviewed by: bde
MFC after: 2 weeks

Bug fixes from NetBSD
- fix sign-compare issues.
- ANSIfy a couple of functions.
- Remove more duplicate #includes.
- Memory leak found by Coverity on NetBSD.

Submitted by: Pedro F. Giffuni <giffunip tutopia com>
Reviewed by: bde
MFC after: 2 weeks

License changes from NetBSD.
Move to 2 clause license, approved by Wolfgang Solfrank.

Submitted by: Pedro F. Giffuni <giffunip tutopia com>
MFC after: 2 weeks

Fixed operation of -f to match its documentation and fsck_ffs. It
has now has no effect except in combination with -p, and plain fsck
checks all file systems instead of skipping clean ones for msdosfs
only.

Renamed the force flag to skipclean and inverted its logic as in
fsck_ffs.

Prepare to fix checkdirty() by moving it from check.c to fat.c. It is
identical to a subset of readfat(), so it belongs near readfat() if not
in it.

Oops, highly non-KNF indentation is normal for large expressions in
this program. Gnu indentation is used for these. Redo the fix for
the large expression at the end of the previous commit to give gnu
indentation. The original version was gnuish but had 9 bogus extra
characters of indentation in its continuation lines, perfect tab
lossage on every line, and other bugs.

The previous commit log should have claimed to fix style bugs in the
previous-1 commit (1.5), not the forced null previous commit (1.6).

Fixed some style bugs in previous commit (mainly highly non-KNF indentation).

Forced commit to note that my previous commit was a Darwin merge.

Make msdosfs support the dirty flag in FAT16 and FAT32.
Enable lockf support.

PR: 55861
Submitted by: Jun Su <junsu@m-net.arbornet.org> (original version)
Reviewed by: make universe

In check.c:
Avoid shadowing declarations.
Avoid compairing signed and unsigned types.

s/filesystem/file system/g as discussed on -developers

more file system > filesystem

Add fsck_msdosfs.

Obtained from: NetBSD