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[Dave Chiluk <1017622@xxxxxxxxxxxxxxxxxx>]

** Changed in: linux (Ubuntu)
     Assignee: Dave Chiluk (chiluk) => (unassigned)

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https://bugs.launchpad.net/bugs/1017622

Title:
  cifs: improve handling of network configuration switch (e.g. from eth
  to wifi)

Status in The Linux Kernel:
  Confirmed
Status in linux package in Ubuntu:
  In Progress

Bug description:
  When switching from a wired network configuration to wifi, my cifs share hangs
  for 300 seconds, before CIFS VFS is reconnecting.
  This happens every time when (un)docking the notebook.

  While this action changes the client's IP address and the routing table, the
  server itself is still reachable (via ping/ssh etc).

  It appears as if the cifs module is using a static route to the server when
  mounting, and therefore cannot reach the server anymore.

  Would it be possible to handle this case (network switch / undocking a
  notebook) better?

  After having found a post on the mailing list [1], I have set the
  echo_retries=1 option for cifs.ko and now the timeout is down to "only" 1
  minute, which is much better already.

  Would it be possible to tune the SMB_ECHO_INTERVAL from user land, e.g. by
  using a kernel module parameter?
  Then setting this to 30 or 10 seconds might be a good enough workaround for me.

  I have also tried re-mounting (mount -o remount) the share, but that did not
  trigger a re-connection either. This might also be a good workaround: via
  ifup/ifdown scripts any cifs shares could be remounted and trigger a
  re-connection to the server, if it is not reachable anymore.

  1: http://www.mail-archive.com/linux-
  cifs@xxxxxxxxxxxxxxx/msg06173.html

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: linux-image-3.2.0-26-generic 3.2.0-26.41
  ProcVersionSignature: Ubuntu 3.2.0-26.41-generic 3.2.19
  Uname: Linux 3.2.0-26-generic x86_64
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 2.0.1-0ubuntu10
  Architecture: amd64
  ArecordDevices:
   **** List of CAPTURE Hardware Devices ****
   card 0: PCH [HDA Intel PCH], device 0: CONEXANT Analog [CONEXANT Analog]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  daniel     4488 F.... pulseaudio
   /dev/snd/pcmC0D0p:   daniel     4488 F...m pulseaudio
  CRDA: Error: [Errno 2] No such file or directory
  Card0.Amixer.info:
   Card hw:0 'PCH'/'HDA Intel PCH at 0xf2520000 irq 47'
     Mixer name	: 'Intel CougarPoint HDMI'
     Components	: 'HDA:14f1506e,17aa21db,00100000 HDA:80862805,80860101,00100000'
     Controls      : 26
     Simple ctrls  : 8
  Card29.Amixer.info:
   Card hw:29 'ThinkPadEC'/'ThinkPad Console Audio Control at EC reg 0x30, fw unknown'
     Mixer name	: 'ThinkPad EC (unknown)'
     Components	: ''
     Controls      : 1
     Simple ctrls  : 1
  Card29.Amixer.values:
   Simple mixer control 'Console',0
     Capabilities: pswitch pswitch-joined penum
     Playback channels: Mono
     Mono: Playback [on]
  Date: Mon Jun 25 19:58:14 2012
  HibernationDevice: RESUME=UUID=c06da6a2-76e0-4b5d-a4b0-f346c56d7537
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
  MachineType: LENOVO 42992PG
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.2.0-26-generic root=/dev/mapper/vg0-rootlv ro rootflags=subvol=@ quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.2.0-26-generic N/A
   linux-backports-modules-3.2.0-26-generic  N/A
   linux-firmware                            1.79
  SourcePackage: linux
  StagingDrivers: mei
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/25/2012
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 8DET61WW (1.31 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 42992PG
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Available
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvr8DET61WW(1.31):bd04/25/2012:svnLENOVO:pn42992PG:pvrThinkPadX220Tablet:rvnLENOVO:rn42992PG:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 42992PG
  dmi.product.version: ThinkPad X220 Tablet
  dmi.sys.vendor: LENOVO

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