cifs: minor documentation updates

5) Continue to extend the smb3 "buildbot" which does automated xfstesting

against Windows, Samba and Azure currently - to add additional tests and

to allow the buildbot to execute the tests faster.

to allow the buildbot to execute the tests faster. The URL for the

buildbot is: http://smb3-test-rhel-75.southcentralus.cloudapp.azure.com

6) Address various coverity warnings (most are not bugs per-se, but

the more warnings are addressed, the easier it is to spot real

  This is the client VFS module for the SMB3 NAS protocol as well

  older dialects such as the Common Internet File System (CIFS)

  as for older dialects such as the Common Internet File System (CIFS)

  protocol which was the successor to the Server Message Block

  (SMB) protocol, the native file sharing mechanism for most early

  PC operating systems. New and improved versions of CIFS are now

  called SMB2 and SMB3. These dialects are also supported by the

  CIFS VFS module. CIFS is fully supported by network

  file servers such as Windows 2000, 2003, 2008, 2012 and 2016

  as well by Samba (which provides excellent CIFS

  server support for Linux and many other operating systems), Apple

  systems, as well as most Network Attached Storage vendors, so

  this network filesystem client can mount to a wide variety of

  servers.

  called SMB2 and SMB3. Use of SMB3 (and later, including SMB3.1.1)

  is strongly preferred over using older dialects like CIFS due to

  security reaasons. All modern dialects, including the most recent,

  SMB3.1.1 are supported by the CIFS VFS module. The SMB3 protocol

  is implemented and supported by all major file servers

  such as all modern versions of Windows (including Windows 2016

  Server), as well as by Samba (which provides excellent

  CIFS/SMB2/SMB3 server support and tools for Linux and many other

  operating systems).  Apple systems also support SMB3 well, as

  do most Network Attached Storage vendors, so this network

  filesystem client can mount to a wide variety of systems.

  It also supports mounting to the cloud (for example

  Microsoft Azure), including the necessary security features.

  The intent of this module is to provide the most advanced network

  file system function for SMB3 compliant servers, including advanced

  cluster file systems for fileserving in some Linux to Linux environments,

  not just in Linux to Windows (or Linux to Mac) environments.

  This filesystem has an mount utility (mount.cifs) that can be obtained from

  This filesystem has a mount utility (mount.cifs) and various user space

  tools (including smbinfo and setcifsacl) that can be obtained from

      https://ftp.samba.org/pub/linux-cifs/cifs-utils/

      https://git.samba.org/?p=cifs-utils.git

  or

      git://git.samba.org/cifs-utils.git

  It must be installed in the directory with the other mount helpers.

  mount.cifs should be installed in the directory with the other mount helpers.

  For more information on the module see the project wiki page at

      https://wiki.samba.org/index.php/LinuxCIFS

  and

      https://wiki.samba.org/index.php/LinuxCIFS_utils

 *  GlobalMid_Lock protects:

 *	list operations on pending_mid_q and oplockQ

 *      updates to XID counters, multiplex id  and SMB sequence numbers

 *      list operations on global DnotifyReqList

 *  tcp_ses_lock protects:

 *	list operations on tcp and SMB session lists

 *  tcon->open_file_lock protects the list of open files hanging off the tcon