[Bug 1713993] [NEW] cifs mount error when specifying prefixpath and having as part of the path

[Jochen Schroeder]

Public bug reported:

Recently some of my cifs mounts have stopped working. This could have
happened due to an upgrade on the server (over which I do not have any
control) or if there was a package update to cifs-utils.

The issue I am seeing is if I try to mount a subdirectory of the network
share, by appending the path to the unc when mounting, the mount fails
with mount error(22): invalid argument

$mount.cifs -vvv //sol.ita.chalmers.se/groups/mc2-common-photonics -o
credentials=/etc/smbcredentials /mnt/PhotonicsGroup/

domain=NET
mount.cifs kernel mount options: ip=129.16.226.60,unc=\\sol.ita.chalmers.se\groups,user=jochens,,domain=NET,prefixpath=mc2-common-photonics,pass=********
mount error(22): Invalid argument
Refer to the mount.cifs(8) manual page (e.g. man mount.cifs)

If I specify the prefixpath via an option the mount succeeds.


$mount.cifs -vvv //sol.ita.chalmers.se/groups/ -o credentials=/etc/smbcredentials,prefixpath=mc2-common-photonics /mnt/PhotonicsGroup/

domain=NET
mount.cifs kernel mount options: ip=129.16.226.60,unc=\\sol.ita.chalmers.se\groups,prefixpath=mc2-common-photonics,user=jochens,,domain=NET,pass=********

I don't really see any difference between the mount options, so I don't
understand what's going on. Also smbclient and gvfs can mount the path
without issues.


$ mount.cifs  -V                                                                                  
                                                                                                                                
mount.cifs version: 6.6

$ lsb_release -rd

Description:	Ubuntu 17.04
Release:	17.04

$ uname -a

Linux MC2-F093 4.10.0-33-generic #37-Ubuntu SMP Fri Aug 11 10:55:28 UTC
2017 x86_64 x86_64 x86_64 GNU/Linux

** Affects: cifs-utils (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1713993

Title:
  cifs mount error when specifying prefixpath and having as part of the
  path

Status in cifs-utils package in Ubuntu:
  New

Bug description:
  Recently some of my cifs mounts have stopped working. This could have
  happened due to an upgrade on the server (over which I do not have any
  control) or if there was a package update to cifs-utils.

  The issue I am seeing is if I try to mount a subdirectory of the
  network share, by appending the path to the unc when mounting, the
  mount fails with mount error(22): invalid argument

  $mount.cifs -vvv //sol.ita.chalmers.se/groups/mc2-common-photonics -o
  credentials=/etc/smbcredentials /mnt/PhotonicsGroup/

  domain=NET
  mount.cifs kernel mount options: ip=129.16.226.60,unc=\\sol.ita.chalmers.se\groups,user=jochens,,domain=NET,prefixpath=mc2-common-photonics,pass=********
  mount error(22): Invalid argument
  Refer to the mount.cifs(8) manual page (e.g. man mount.cifs)

  If I specify the prefixpath via an option the mount succeeds.

  
  $mount.cifs -vvv //sol.ita.chalmers.se/groups/ -o credentials=/etc/smbcredentials,prefixpath=mc2-common-photonics /mnt/PhotonicsGroup/

  domain=NET
  mount.cifs kernel mount options: ip=129.16.226.60,unc=\\sol.ita.chalmers.se\groups,prefixpath=mc2-common-photonics,user=jochens,,domain=NET,pass=********

  I don't really see any difference between the mount options, so I
  don't understand what's going on. Also smbclient and gvfs can mount
  the path without issues.


  
  $ mount.cifs  -V                                                                                  
                                                                                                                                  
  mount.cifs version: 6.6

  $ lsb_release -rd

  Description:	Ubuntu 17.04
  Release:	17.04

  $ uname -a

  Linux MC2-F093 4.10.0-33-generic #37-Ubuntu SMP Fri Aug 11 10:55:28
  UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

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