touch-packages team mailing list archive

[Charlie Todd <chtodd@xxxxxxxxxx>]

Public bug reported:

the /bin/mv command fails to preserve extended attributes, specifically
the COW (lsattr; chattr +C) on btrfs, for both files and directories.
Affects virtual machine images in VirtualBox which perform POORLY if
hosted on btrfs without COW set.

Workaround:
1. Set the folder to have the COW flag (chattr +C .)
2. Back up all of the files (for c in *; do mv $c $c.old; done)
3. Copy the files to the same folder, assuming that there is space, and delete the backup upon success (for c in $.old; do cp $c ${c/.old/} && rm $c)

User has to copy the file to a COW flagged directory before VirtualBox
will talk correctly to the block device images.

coreutils, 8.21-1ubuntu5, amd64
btrfs-tools, 3.12-1, amd64
kernel 3.13.0-32-generic

Filesystem was created under Trusty (14.04.1 LTS).

$ apt-cache policy coreutils
coreutils:
  Installed: 8.21-1ubuntu5
  Candidate: 8.21-1ubuntu5
  Version table:
 *** 8.21-1ubuntu5 0
        500 http://us.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages
        100 /var/lib/dpkg/status

Thanks

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: coreutils 8.21-1ubuntu5
ProcVersionSignature: Ubuntu 3.13.0-32.57-generic 3.13.11.4
Uname: Linux 3.13.0-32-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.14.1-0ubuntu3.5
Architecture: amd64
CurrentDesktop: Unity
Date: Sat Dec  6 15:33:07 2014
InstallationDate: Installed on 2014-11-06 (30 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
SourcePackage: coreutils
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: coreutils (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug trusty

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https://bugs.launchpad.net/bugs/1400010

Title:
  mv fails to preserve COW on btrfs

Status in coreutils package in Ubuntu:
  New

Bug description:
  the /bin/mv command fails to preserve extended attributes,
  specifically the COW (lsattr; chattr +C) on btrfs, for both files and
  directories.  Affects virtual machine images in VirtualBox which
  perform POORLY if hosted on btrfs without COW set.

  Workaround:
  1. Set the folder to have the COW flag (chattr +C .)
  2. Back up all of the files (for c in *; do mv $c $c.old; done)
  3. Copy the files to the same folder, assuming that there is space, and delete the backup upon success (for c in $.old; do cp $c ${c/.old/} && rm $c)

  User has to copy the file to a COW flagged directory before VirtualBox
  will talk correctly to the block device images.

  coreutils, 8.21-1ubuntu5, amd64
  btrfs-tools, 3.12-1, amd64
  kernel 3.13.0-32-generic

  Filesystem was created under Trusty (14.04.1 LTS).

  $ apt-cache policy coreutils
  coreutils:
    Installed: 8.21-1ubuntu5
    Candidate: 8.21-1ubuntu5
    Version table:
   *** 8.21-1ubuntu5 0
          500 http://us.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages
          100 /var/lib/dpkg/status

  Thanks

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: coreutils 8.21-1ubuntu5
  ProcVersionSignature: Ubuntu 3.13.0-32.57-generic 3.13.11.4
  Uname: Linux 3.13.0-32-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.14.1-0ubuntu3.5
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Sat Dec  6 15:33:07 2014
  InstallationDate: Installed on 2014-11-06 (30 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  SourcePackage: coreutils
  UpgradeStatus: No upgrade log present (probably fresh install)

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