[Bug 880645] Re: "btrfs device delete /dev/sdaX /" fails with error "ERROR: error removing the device '/dev/sdaX'"

[Ketil Malde]

I get an error when trying to remove one disk from a set of three (so metadata could still be mirrored).  This is on Precise Pangolin.  I also include the output of "filesystem show", as something clearly happened here, although I'm unsure how to interpret it.
 
% sudo btrfs fi show  
Label: 'scratch'  uuid: 184706ea-89f5-438a-a9f5-b5e91b3ce267
        Total devices 3 FS bytes used 140.62GB
        devid    1 size 2.73TB used 138.02GB path /dev/sda
        devid    2 size 2.73TB used 137.01GB path /dev/sdb
        devid    3 size 2.73TB used 138.01GB path /dev/sdc

% sudo btrfs dev del /dev/sdc /scratch
ERROR: error removing the device '/dev/sdc'

% sudo btrfs fi show                  
Label: 'scratch'  uuid: 184706ea-89f5-438a-a9f5-b5e91b3ce267
        Total devices 3 FS bytes used 141.49GB
        devid    1 size 2.73TB used 75.03GB path /dev/sda
        devid    2 size 2.73TB used 75.01GB path /dev/sdb
        devid    3 size 2.73TB used 138.01GB path /dev/sdc

Btrfs Btrfs v0.19

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https://bugs.launchpad.net/bugs/880645

Title:
  "btrfs device delete /dev/sdaX /" fails with error "ERROR: error
  removing the device '/dev/sdaX'"

Status in “btrfs-tools” package in Ubuntu:
  Confirmed

Bug description:
  What I did to cause this:

  Installed ubuntu using btrtfs root.
  Added a device with 'btrfs device add /dev/sda9 /'
  Balanced the file system with 'btrfs filesystem balance /'
  Tried to remove a device with 'btrfs device delete /dev/sda9 /'. Noticed that I got the error "ERROR: error removing the device '/dev/sda9'".

  (Unfortunately, I'm not sure how to get more information on the
  problem.)

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: btrfs-tools 0.19+20100601-3ubuntu3
  ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
  Uname: Linux 3.0.0-12-generic x86_64
  NonfreeKernelModules: nvidia wl
  ApportVersion: 1.23-0ubuntu3
  Architecture: amd64
  Date: Mon Oct 24 00:44:42 2011
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111010)
  ProcEnviron:
   LC_CTYPE=C
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/zsh
  SourcePackage: btrfs-tools
  UpgradeStatus: No upgrade log present (probably fresh install)

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