[Bug 1572132] Re: SMB driver (SMBv2) does not show all files when mounting a windows top level share

[Nish Aravamudan]

This seems like a sort of known issue (unclear still). Cursory grepping
in fs/cifs:

readdir.c::find_cifs_entry

        /*
         * If first entry in buf is zero then is first buffer
         * in search response data which means it is likely . and ..
         * will be in this buffer, although some servers do not return
         * . and .. for the root of a drive and for those we need
         * to start two entries earlier.
         */

It might be helpful to enable some more cifs debugging by booting with

dyndbg="file fs/cifs/readdir.c +p"

appended to the kernel commandline?

Also, is there a reason you are passing 'nounix' specifically? It seems
like an uncommon option to need.

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https://bugs.launchpad.net/bugs/1572132

Title:
  SMB driver (SMBv2) does not show all files when mounting a windows top
  level share

Status in samba package in Ubuntu:
  New

Bug description:
  When using the SMBv2 Protocol to mount a top level windows share (such
  as C:\) not all files (or directories) are shown that exist  on the
  server side. Exactly 2 files are always missing...

  Steps to reproduce:
  On a windows7 PC (or Server) e.g. C:\ must be published as Share (must be top level share - a subfolder like C:\data\ seems to work)

  sudo mount -t cifs //SERVER/SHARE_NAME /mnt -o
  domain=DOMAIN_NAME,username=${USER},uid=1000,gid=1000,nounix,vers=2.0

  As a result always 2 Files (or directories) are missing in the mounted
  directory of the ubuntu installation.

  Seems to be a kernel bug (source tree: linux/fs/cifs).

  The ubuntu versions I have checked:
  Ubuntu 14.04LTS amd64
  Ubuntu 15.10 amd64
  Ubuntu 16.04 amd64

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubuntu-release-upgrader-core 1:16.04.12
  ProcVersionSignature: Ubuntu 4.4.0-18.34-generic 4.4.6
  Uname: Linux 4.4.0-18-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: KDE
  Date: Tue Apr 19 14:50:02 2016
  InstallationDate: Installed on 2016-04-19 (0 days ago)
  InstallationMedia: Kubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160417.1)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  Symptom: ubuntu-release-upgrader
  UpgradeStatus: No upgrade log present (probably fresh install)

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