[Bug 1724013] Re: mount does not correctly process x-* options

[DaytonaJohn]

However, mount.cifs ignores the options passed to it by the util-linux
mount when it is not invoked by root. In that case, mount.cifs obtains
the options from the fstab file and does not do any processing to ignore
comments. So the status of this bug should not be invalid, unless
mount.cifs is not part of util-linux.

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Title:
  mount does not correctly process x-* options

Status in util-linux package in Ubuntu:
  Invalid

Bug description:
  According to the mount(8) man page:

  All options prefixed with "x-" are interpreted as comments or as
  userspace application-specific options.  These options are not stored
  in  the  mtab  file,  nor  sent  to  the mount.type helpers nor to the
  mount(2) system call.  The suggested format is x-appname.option (e.g.
  x-systemd.automount).

  However, adding any such option to cifs entry, such as "x-test.opt"
  (other than x-systemd.automount) results in:

  mount error(22): Invalid argument
  Refer to the mount.cifs(8) manual page (e.g. man mount.cifs)

  No options starting with "x-" should be passed to mount.cifs, so the
  mount should succeed.

  Running Ubuntu 16.04.3 LTS
  mount package installed is 2.27.1-6ubuntu3.3

  This error always happens when such an option is specified. Here is an example fstab line that causes this failure:
  //192.168.1.3/Public    /mnt/mybook    cifs   noauto,x-test.opt,rw,users,noperm,guest,soft,cache=none,sec=none  0  0

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: mount 2.27.1-6ubuntu3.3
  ProcVersionSignature: Ubuntu 4.4.0-97.120-generic 4.4.87
  Uname: Linux 4.4.0-97-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
  ApportVersion: 2.20.1-0ubuntu2.10
  Architecture: amd64
  CurrentDesktop: KDE
  Date: Mon Oct 16 12:29:40 2017
  InstallationDate: Installed on 2016-04-22 (542 days ago)
  InstallationMedia: Kubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/usr/bin/tcsh
  SourcePackage: util-linux
  UpgradeStatus: No upgrade log present (probably fresh install)

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