[Bug 882147] Re: overlayfs does not implement inotify interfaces correctly

[Mike Mestnik]

I don't see the logic in having tail depend on this know buggy kernel
feature, while avoiding dependencies on non-documented features of tail
on a liveCD.

...It makes more sense to me that we depend on a nominally useful
feature add instead of depending on code that always works and perhaps
luck.  IMHO there will always be a few bugs and there should always be
by-passes to allow for working around them.  This feature add is a good
example, providing a secondary code path for unusual situations.

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Title:
  overlayfs does not implement inotify interfaces correctly

Status in “coreutils” package in Ubuntu:
  In Progress
Status in “linux” package in Ubuntu:
  Triaged
Status in “coreutils” source package in Precise:
  Confirmed
Status in “linux” source package in Precise:
  Triaged

Bug description:
  When using tail on the liveCD some updates are not reported.  This
  seems to be triggered by tail using inotify to identify modified
  files.  Overlayfs does not appear to be implementing inotify quite the
  way you might hope reporting only against the underlying filesystems.

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: linux-image-3.0.0-12-generic 3.0.0-12.20
  ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
  Uname: Linux 3.0.0-12-generic x86_64
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 1.23-0ubuntu3
  Architecture: amd64
  ArecordDevices:
   **** List of CAPTURE Hardware Devices ****
   card 0: Intel [HDA Intel], device 0: STAC92xx Analog [STAC92xx Analog]
     Subdevices: 0/1
     Subdevice #0: subdevice #0
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  apw        2296 F.... pulseaudio
   /dev/snd/pcmC0D0c:   apw        2296 F...m pulseaudio
   /dev/snd/pcmC0D0p:   apw        2296 F...m pulseaudio
  Card0.Amixer.info:
   Card hw:0 'Intel'/'HDA Intel at 0xfc700000 irq 47'
     Mixer name	: 'Intel Cantiga HDMI'
     Components	: 'HDA:111d7675,1028029f,00100103 HDA:80862802,80860101,00100000'
     Controls      : 20
     Simple ctrls  : 11
  Date: Wed Oct 26 17:46:16 2011
  EcryptfsInUse: Yes
  HibernationDevice: RESUME=UUID=d8328455-deac-4bae-877d-c408d371cefe
  MachineType: Dell Inc. Studio 1537
  ProcEnviron:
   PATH=(custom, user)
   LANG=en_GB.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-12-generic root=UUID=cf503727-25f2-4ecd-b0f3-2b894523bcba ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.0.0-12-generic N/A
   linux-backports-modules-3.0.0-12-generic  N/A
   linux-firmware                            1.60
  SourcePackage: linux
  UpgradeStatus: Upgraded to oneiric on 2011-10-17 (9 days ago)
  WpaSupplicantLog:
   
  dmi.bios.date: 09/22/2008
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A03
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A03
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: A03
  dmi.modalias: dmi:bvnDellInc.:bvrA03:bd09/22/2008:svnDellInc.:pnStudio1537:pvrA03:rvnDellInc.:rn:rvrA03:cvnDellInc.:ct8:cvrA03:
  dmi.product.name: Studio 1537
  dmi.product.version: A03
  dmi.sys.vendor: Dell Inc.

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