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 r228796:
Discarding local array based on return values.

MFC r227650:
Add unicode support to msdosfs and smbfs; original pathes from imura,
bug fixes by Kuan-Chung Chiu <buganini at gmail dot com>.

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

Approved by: re (implicit)

Switch to our preferred 2-clause BSD license.

Approved by: bp

Catch up internal locking routines in netsmb with lockmgr changes --
explicit thread arguments are no longer required in many places.

Remove unused vc_tnode field from struct smb_vc.

MFC after: 3 days

- Handle buffer lock waiters count directly in the buffer cache instead
than rely on the lockmgr support [1]:
* bump the waiters only if the interlock is held
* let brelvp() return the waiters count
* rely on brelvp() instead than BUF_LOCKWAITERS() in order to check
for the waiters number
- Remove a namespace pollution introduced recently with lockmgr.h
including lock.h by including lock.h directly in the consumers and
making it mandatory for using lockmgr.
- Modify flags accepted by lockinit():
* introduce LK_NOPROFILE which disables lock profiling for the
specified lockmgr
* introduce LK_QUIET which disables ktr tracing for the specified
lockmgr [2]
* disallow LK_SLEEPFAIL and LK_NOWAIT to be passed there so that it
can only be used on a per-instance basis
- Remove BUF_LOCKWAITERS() and lockwaiters() as they are no longer
used

This patch breaks KPI so __FreBSD_version will be bumped and manpages
updated by further commits. Additively, 'struct buf' changes results in
a disturbed ABI also.

[2] Really, currently there is no ktr tracing in the lockmgr, but it
will be added soon.

[1] Submitted by: kib
Tested by: pho, Andrea Barberio <insomniac at slackware dot it>

/* -> /*- for license, minor formatting changes

Add support for SMB request signing, which prevents "man in the middle"
attacks and is required to connect to Windows 2003 servers in their
default configuration. This adds an extra field to the SMB header
containing the truncated 64-bit MD5 digest of a key (a function of the
user's password and the server's authentication challenge), an implicit
sequence number, and the message data itself. As signing each message
imposes a significant performance penalty, we only enable it if the
server will not let us connect without it; this should eventually become
an option to mount_smbfs.

Reserve space for the trailing null byte in the srvname member of
struct smb_vc_info.

PR: 46902

Implement support for mixed case passwords.

Obtained from: Darwin
MFC after: 2 weeks

Add support for large readx and writex functions if server supports them.

Obtained from: Darwin
MFC after: 2 weeks

Include <sys/lockmgr.h> for old lock interfaces instead of including
<sys/lock.h> solely for its namespace pollution.

Add unicode related definition for future use. Descibe Samba bug.

Obtained from: Darwin project
MFC after: 2 weeks

Spelling fixes.

PR: kern/33131
Submitted by: Anders Andersson <anders@hack.org>
MFC after: 1 week

Pull netsmb requester from the pre-KSE world. This update mostly based
on the patches submitted by Max Khon <fjoe@iclub.nsu.ru>

Remove bogus include.

Import kernel part of SMB/CIFS requester.
Add smbfs(CIFS) filesystem.

Userland part will be in the ports tree for a while.

Obtained from: smbfs-1.3.7-dev package.