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

[Tom]

I can also reproduce this bug, both with 10.10 (kernel 2.6.35) and 11.10
(which has 3.x)

It also fails even if you use "mkfs.btrfs -m single -d single /dev/sdxx"
when you create the initial device for the btrfs filesystem.

It seems to work OK if all the devices have no data on them, like if you
create several small loopback devices, add no data to the filesystem,
then you will have no trouble adding and removing devices willy-nilly.

Here's how it pops up for me:  I have a 2 TB btrfs filesystem (1 drive)
about halfway full.  I then  added a 2nd 2TB drive to the
pool/filesystem.  I did a sync and then immediately tried to remove the
2nd device.  No go.  You can issue "btrfs device delete ..." all you
like.  It won't remove, even though no data has been written to it yet.
It's locked in place it seems :-(

I am attaching a testcase that reproduces the bug.

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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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