btrfs subvolume list - with three subvolumes, the second is missing/not showing

btrfs subvolume list - with three subvolumes, the second is missing/not showing

[Christopher Thorjussen]

I've created a large btrfs volume out of two large raid-60 devices. On
there I've created three subvolumes. When I do a list of those the 2nd
isn't displayed. If I however add a fouth subvol they all gets listed.

This is on a HP DL360 running RHEL6.3 with a P411 SAS Raid controller
connected to a HP MD600 (70 x 2TB NL-SAS).
I've installed kernel-ml v3.7.4 from elrepo and also installed
btrfs-progs-0.19-12.el6.x86_64

root@data01:/opt/data# btrfs fi sh
failed to read /dev/sr0
Label: none  uuid: 786684d1-95fa-4809-8fca-e17e37a79999
        Total devices 2 FS bytes used 816.00KB
        devid    1 size 54.58TB used 2.03GB path /dev/sdb
        devid    2 size 54.58TB used 2.01GB path /dev/sdc

Btrfs Btrfs v0.19

root@data01:/opt/data# ls -l
total 0
drwxr-xr-x 1 root root 0 Jan 31 15:55 buffer
drwxr-xr-x 1 root root 0 Jan 31 15:55 consolidated
drwxr-xr-x 1 root root 0 Jan 31 15:55 staging

root@data01:/opt/data# btrfs subvolume list .
ID 265 top level 5 path consolidated
ID 267 top level 5 path buffer

root@data01:/opt/data# btrfs subvolume create 4thsubvol
Create subvolume './4thsubvol'

root@data01:/opt/data# btrfs subvolume list .
ID 265 top level 5 path consolidated
ID 266 top level 5 path staging
ID 267 top level 5 path buffer
ID 272 top level 5 path 4thsubvol

root@data01:/opt/data# rpm -qa | grep btrfs
btrfs-progs-0.19-12.el6.x86_64

It surely is a bug, but has it been reported and/or fixed? I wasn't
able to find out by googling just now.



Med vennlig hilsen / kind regards

Christopher Thorjussen
System Administrator, VCP4/VCP5
The Online Backup Company AS
http://www.onlinebackupcompany.no

"Backup isn't the real concern. Restoring normal business is."

Re: btrfs subvolume list - with three subvolumes, the second is missing/not showing

[Hugo Mills]

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On Thu, Jan 31, 2013 at 04:39:52PM +0100, Christopher Thorjussen wrote:
> I've created a large btrfs volume out of two large raid-60 devices. On
> there I've created three subvolumes. When I do a list of those the 2nd
> isn't displayed. If I however add a fouth subvol they all gets listed.

   This is (probably) a known bug in the userspace tools. It should be
fixed in David Sterba's integration branch:

  git://repo.or.cz/btrfs-progs-unstable/devel.git integration-20130130          
   Hugo.

> This is on a HP DL360 running RHEL6.3 with a P411 SAS Raid controller
> connected to a HP MD600 (70 x 2TB NL-SAS).
> I've installed kernel-ml v3.7.4 from elrepo and also installed
> btrfs-progs-0.19-12.el6.x86_64
> 
> root@data01:/opt/data# btrfs fi sh
> failed to read /dev/sr0
> Label: none  uuid: 786684d1-95fa-4809-8fca-e17e37a79999
>         Total devices 2 FS bytes used 816.00KB
>         devid    1 size 54.58TB used 2.03GB path /dev/sdb
>         devid    2 size 54.58TB used 2.01GB path /dev/sdc
> 
> Btrfs Btrfs v0.19
> 
> root@data01:/opt/data# ls -l
> total 0
> drwxr-xr-x 1 root root 0 Jan 31 15:55 buffer
> drwxr-xr-x 1 root root 0 Jan 31 15:55 consolidated
> drwxr-xr-x 1 root root 0 Jan 31 15:55 staging
> 
> root@data01:/opt/data# btrfs subvolume list .
> ID 265 top level 5 path consolidated
> ID 267 top level 5 path buffer
> 
> root@data01:/opt/data# btrfs subvolume create 4thsubvol
> Create subvolume './4thsubvol'
> 
> root@data01:/opt/data# btrfs subvolume list .
> ID 265 top level 5 path consolidated
> ID 266 top level 5 path staging
> ID 267 top level 5 path buffer
> ID 272 top level 5 path 4thsubvol
> 
> root@data01:/opt/data# rpm -qa | grep btrfs
> btrfs-progs-0.19-12.el6.x86_64
> 
> It surely is a bug, but has it been reported and/or fixed? I wasn't
> able to find out by googling just now.
> 
> 
> 
> Med vennlig hilsen / kind regards
> 
> Christopher Thorjussen
> System Administrator, VCP4/VCP5
> The Online Backup Company AS
> http://www.onlinebackupcompany.no
> 
> "Backup isn't the real concern. Restoring normal business is."

-- 
=== Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk ===
  PGP key: 515C238D from wwwkeys.eu.pgp.net or http://www.carfax.org.uk
  --- What do you give the man who has everything? -- Penicillin is ---  
                             a good start...                             

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Re: btrfs subvolume list - with three subvolumes, the second is missing/not showing

[Christopher Thorjussen]

On Thu, Jan 31, 2013 at 11:00 PM, Hugo Mills <hugo@carfax.org.uk> wrote:
> On Thu, Jan 31, 2013 at 04:39:52PM +0100, Christopher Thorjussen wrote:
>> I've created a large btrfs volume out of two large raid-60 devices. On
>> there I've created three subvolumes. When I do a list of those the 2nd
>> isn't displayed. If I however add a fouth subvol they all gets listed.
>
>    This is (probably) a known bug in the userspace tools. It should be
> fixed in David Sterba's integration branch:
>
>   git://repo.or.cz/btrfs-progs-unstable/devel.git integration-20130130
>    Hugo.
>

Thanks. Will have a look.
For now I just created a "hidden" subvolume with .HiddenName as name.
That gives me four subvol and all are listed.

/Christopher