Btrfs devel - Sep 2013 - btrfs-convert won't convert ext* - No valid Btrfs found on /dev/sdb1

Hello guys, i try to convert ext4 volume, but btrfs-convert show me error:
"No valid Btrfs found on file
unable to open ctree
conversion aborted."
Ubuntu 13.04
Kernel: 3.11
btrfs-progs git version 0.20-git20130822~194aa4a13

way to reproduce error:
$ truncate -s 4G file
$ mkfs.ext4 file #say yes to create fs on non block device.
$ btrfs-convert file
 No valid Btrfs found on file
 unable to open ctree
 conversion aborted.

With best regards,
Timofey.
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On Thu, Sep 05, 2013 at 05:43:27PM +0300, Тимофей Титовец
wrote:
> Hello guys, i try to convert ext4 volume, but btrfs-convert show me error:
> "No valid Btrfs found on file
> unable to open ctree
> conversion aborted."
> Ubuntu 13.04
> Kernel: 3.11
> btrfs-progs git version 0.20-git20130822~194aa4a13
> 
> way to reproduce error:
> $ truncate -s 4G file
> $ mkfs.ext4 file #say yes to create fs on non block device.
> $ btrfs-convert file
>  No valid Btrfs found on file
>  unable to open ctree
>  conversion aborted.
   I''m guessing here, but I suspect you will need to create a loopback
device so that btrfs-convert can look at it as a block device rather
than as a file:

# losetup -f --show file
/dev/loop0
# btrfs-convert /dev/loop0

   Hugo.

-- 
=== Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk ==  PGP
key: 65E74AC0 from wwwkeys.eu.pgp.net or http://www.carfax.org.uk
      --- Eighth Army Push Bottles Up Germans -- WWII newspaper ---      
                     headline (possibly apocryphal)

On Thu, 5 Sep 2013 15:54:07 +0100
Hugo Mills <hugo@carfax.org.uk> wrote:
> On Thu, Sep 05, 2013 at 05:43:27PM +0300, Тимофей Титовец wrote:
> > Hello guys, i try to convert ext4 volume, but btrfs-convert show me
error:
> > "No valid Btrfs found on file
> > unable to open ctree
> > conversion aborted."
> > Ubuntu 13.04
> > Kernel: 3.11
> > btrfs-progs git version 0.20-git20130822~194aa4a13
> > 
> > way to reproduce error:
> > $ truncate -s 4G file
> > $ mkfs.ext4 file #say yes to create fs on non block device.
> > $ btrfs-convert file
> >  No valid Btrfs found on file
> >  unable to open ctree
> >  conversion aborted.
> 
>    I''m guessing here, but I suspect you will need to create a
loopback
> device so that btrfs-convert can look at it as a block device rather
> than as a file:
> 
> # losetup -f --show file
> /dev/loop0
> # btrfs-convert /dev/loop0
> 
>    Hugo.
> 
Nope, just today I saw someone report the same problem in a blog comment:
http://popey.com/blog/2013/09/02/fun-with-btrfs-on-ubuntu/#comment-9704

-------
# umount /dev/sdb1
# fsck -f /dev/sdb1
fsck из util-linux 2.20.1
e2fsck 1.42.8 (20-Jun-2013)
data500: 144653/30531584 files (0.9% non-contiguous), 102659367/122096384
blocks

# btrfs-convert /dev/sdb1
No valid Btrfs found on /dev/sdb1
unable to open ctree
conversion aborted.

Ubuntu 13.10
btrfs-tools 0.19+20130705-1
-------

It looks like a bug in btrfs-convert.

-- 
With respect,
Roman

On Thu, Sep 05, 2013 at 09:06:19PM +0600, Roman Mamedov
wrote:
> On Thu, 5 Sep 2013 15:54:07 +0100
> Hugo Mills <hugo@carfax.org.uk> wrote:
> 
> > On Thu, Sep 05, 2013 at 05:43:27PM +0300, Тимофей Титовец wrote:
> > > Hello guys, i try to convert ext4 volume, but btrfs-convert show
me error:
> > > "No valid Btrfs found on file
> > > unable to open ctree
> > > conversion aborted."
> > > Ubuntu 13.04
> > > Kernel: 3.11
> > > btrfs-progs git version 0.20-git20130822~194aa4a13
> > > 
> > > way to reproduce error:
> > > $ truncate -s 4G file
> > > $ mkfs.ext4 file #say yes to create fs on non block device.
> > > $ btrfs-convert file
> > >  No valid Btrfs found on file
> > >  unable to open ctree
> > >  conversion aborted.
> > 
> >    I''m guessing here, but I suspect you will need to create a
loopback
> > device so that btrfs-convert can look at it as a block device rather
> > than as a file:
> > 
> > # losetup -f --show file
> > /dev/loop0
> > # btrfs-convert /dev/loop0
> > 
> >    Hugo.
> > 
> 
> Nope, just today I saw someone report the same problem in a blog comment:
> http://popey.com/blog/2013/09/02/fun-with-btrfs-on-ubuntu/#comment-9704
   It''s the same person, in fact. I''d not seen that the one on
popey''s
blog was doing it with block devices. This does indeed look like a
fairly drastic bug...

   Hugo.

-- 
=== Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk ==  PGP
key: 65E74AC0 from wwwkeys.eu.pgp.net or http://www.carfax.org.uk
         --- Is it true that "last known good" on Windows XP ---
                            boots into CP/M?

On Thu, 5 Sep 2013 16:30:23 +0100
Hugo Mills <hugo@carfax.org.uk> wrote:
> > Nope, just today I saw someone report the same problem in a blog
comment:
> >
http://popey.com/blog/2013/09/02/fun-with-btrfs-on-ubuntu/#comment-9704
> 
>    It''s the same person, in fact.
FWIW both names are Cyrillic but they are different.


-- 
With respect,
Roman

On Thu, Sep 05, 2013 at 09:34:12PM +0600, Roman Mamedov
wrote:
> On Thu, 5 Sep 2013 16:30:23 +0100
> Hugo Mills <hugo@carfax.org.uk> wrote:
> 
> > > Nope, just today I saw someone report the same problem in a blog
comment:
> > >
http://popey.com/blog/2013/09/02/fun-with-btrfs-on-ubuntu/#comment-9704
> > 
> >    It''s the same person, in fact.
> 
> FWIW both names are Cyrillic but they are different.
   No, sorry, you''re right. I remembered seeing Timofey''s name
somewhere before, and thought it was from that blog post. Clearly I
wasn''t all that awake at 7.30 this morning when I read it. :)

   Hugo.

-- 
=== Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk ==  PGP
key: 65E74AC0 from wwwkeys.eu.pgp.net or http://www.carfax.org.uk
         --- Is it true that "last known good" on Windows XP ---
                            boots into CP/M?

On 9/5/13 9:43 AM, Тимофей Титовец wrote:
> Hello guys, i try to convert ext4 volume, but btrfs-convert show me error:
> "No valid Btrfs found on file
> unable to open ctree
> conversion aborted."
> Ubuntu 13.04
> Kernel: 3.11
> btrfs-progs git version 0.20-git20130822~194aa4a13
> 
> way to reproduce error:
> $ truncate -s 4G file
> $ mkfs.ext4 file #say yes to create fs on non block device.
> $ btrfs-convert file
>  No valid Btrfs found on file
>  unable to open ctree
>  conversion aborted.
This was a regression around July 3; there was no regression test at
the time.

[615f2867854c186a37cb2e2e5a2e13e9ed4ab0df] Btrfs-progs: cleanup similar code in
open_ctree_* and close_ctree

broke it.

Patches were sent to the list to fix it on July 17,

https://patchwork.kernel.org/patch/2828820/

but they haven''t been merged into the main repo.

I sent a regression test for it to the list on Aug 4, but nobody
reviewed it, so it hasn''t been merged into the test suite, either.

Winning all around!

-Eric
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On Thu, Sep 05, 2013 at 10:45:23AM -0500, Eric Sandeen
wrote:
> On 9/5/13 9:43 AM, Тимофей Титовец wrote:
> > Hello guys, i try to convert ext4 volume, but btrfs-convert show me
error:
> > "No valid Btrfs found on file
> > unable to open ctree
> > conversion aborted."
> > Ubuntu 13.04
> > Kernel: 3.11
> > btrfs-progs git version 0.20-git20130822~194aa4a13
> > 
> > way to reproduce error:
> > $ truncate -s 4G file
> > $ mkfs.ext4 file #say yes to create fs on non block device.
> > $ btrfs-convert file
> >  No valid Btrfs found on file
> >  unable to open ctree
> >  conversion aborted.
> 
> This was a regression around July 3; there was no regression test at
> the time.
> 
> [615f2867854c186a37cb2e2e5a2e13e9ed4ab0df] Btrfs-progs: cleanup similar
code in open_ctree_* and close_ctree
> 
> broke it.
> 
> Patches were sent to the list to fix it on July 17,
> 
> https://patchwork.kernel.org/patch/2828820/
> 
> but they haven''t been merged into the main repo.
> 
> I sent a regression test for it to the list on Aug 4, but nobody
> reviewed it, so it hasn''t been merged into the test suite, either.
> 
> Winning all around!
Alright, alright I''ll review it, Jesus.  ;),

Josef
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Hello Josef,

Josef Bacik <jbacik <at> fusionio.com> writes:
> 
> On Thu, Sep 05, 2013 at 10:45:23AM -0500, Eric Sandeen wrote:
[...]
> > This was a regression around July 3; there was no regression test at
> > the time.
> > 
> > [615f2867854c186a37cb2e2e5a2e13e9ed4ab0df] Btrfs-progs: cleanup
similar
code in open_ctree_* and close_ctree
> > 
> > broke it.
> > 
> > Patches were sent to the list to fix it on July 17,
> > 
> > https://patchwork.kernel.org/patch/2828820/
> > 
> > but they haven''t been merged into the main repo.
> > 
> > I sent a regression test for it to the list on Aug 4, but nobody
> > reviewed it, so it hasn''t been merged into the test suite,
either.
> > 
> > Winning all around!
> 
> Alright, alright I''ll review it, Jesus.  ;),
Is there any progress on this or can I help with solving this somehow?
 
> Josef
Daniel

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Hello Daniel,

On 10/11/2013 03:52 PM, Daniel wrote:
> Hello Josef,
>
> Josef Bacik <jbacik <at> fusionio.com> writes:
>
>> On Thu, Sep 05, 2013 at 10:45:23AM -0500, Eric Sandeen wrote:
> [...]
>
>>> This was a regression around July 3; there was no regression test
at
>>> the time.
>>>
>>> [615f2867854c186a37cb2e2e5a2e13e9ed4ab0df] Btrfs-progs: cleanup
similar
> code in open_ctree_* and close_ctree
>>> broke it.
>>>
>>> Patches were sent to the list to fix it on July 17,
>>>
>>> https://patchwork.kernel.org/patch/2828820/
>>>
>>> but they haven''t been merged into the main repo.
>>>
>>> I sent a regression test for it to the list on Aug 4, but nobody
>>> reviewed it, so it hasn''t been merged into the test suite,
either.
>>>
>>> Winning all around!
>> Alright, alright I''ll review it, Jesus.  ;),
> Is there any progress on this or can I help with solving this somehow?
This problem has been fixed , but it did not come into Chris''s branch.
But it did come into david''s integration branches.

http://github.com/kdave/btrfs-progs.git integration-20131008

Thanks,
Wang
>   
>> Josef
> Daniel
>
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