Btrfs devel - May 2013 - btrfs subv list -> ERROR: Failed to lookup path for root 0 - No such file or directory

Hello

I''m on Ubuntu 13.04 with Ubuntu kernel 3.8.0-19-lowlatency and
Btrfs v0.20-rc1.

Sometimes, I''m unable to list the subvolumes of a filesystem, like so:

root@ask-home:~# btrfs subv list /home
ERROR: Failed to lookup path for root 0 - No such file or directory

This was after I removed a few snapshots of this subvolume.

To be able to list again, I''ve got to do a "list -a":

root@ask-home:~# btrfs subv list -a /home
ID 256 gen 28692 top level 5 path <FS_TREE>/home
ID 257 gen 28695 top level 256 path a
ID 258 gen 28695 top level 5 path <FS_TREE>/Cloud
ID 276 gen 28695 top level 5 path <FS_TREE>/Media
ID 277 gen 28695 top level 5 path <FS_TREE>/Cloud/Dropbox
ID 283 gen 28695 top level 5 path <FS_TREE>/VirtualBox

Then the normal list works again:

root@ask-home:~# btrfs subv list /home
ID 257 gen 28695 top level 256 path a

Reg. the "<FS_TREE>" - that''s (I guess...) because I
mounted the
subvolume at /home; see /etc/fstab:

root@ask-home:~# grep /home /etc/fstab
/dev/ssd/Data /home btrfs defaults,noatime,ssd,discard,subvol=home 0 0

Why''s that happening? Should I report this as a bug on bugzilla?

Regards,

Alexander
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On Fri, 3 May 2013, Alexander Skwar
<alexanders.mailinglists+nospam@gmail.com>
wrote:
> Hello
> 
> I''m on Ubuntu 13.04 with Ubuntu kernel 3.8.0-19-lowlatency and
> Btrfs v0.20-rc1.
> 
> Sometimes, I''m unable to list the subvolumes of a filesystem, like
so:
> 
> root@ask-home:~# btrfs subv list /home
> ERROR: Failed to lookup path for root 0 - No such file or directory
I asked a similar question about 10 days ago and got the below response which 
solved it for me.

On Thu, 25 Apr 2013, Wang Shilong <wangsl-fnst@cn.fujitsu.com>
wrote:
> This problem has been fixed.Would you please try the latest btrfs-progs,
> and see it this problem happens again.
> 
> Btrfs-progs commitid: 64edc851da59c47b92ee6830101be0854add7f09 fix this
> problem. The latest btrfs-progs url:
> http://git.kernel.org/cgit/linux/kernel/git/mason/btrfs-progs.git
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Hi Russel

Russell Coker <russell <at> coker.com.au> writes:
> I asked a similar question about 10 days ago and got the below response 
which 
> solved it for me.

Thanks a lot. This solved it for me as well.

Cheers,
Alexander

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Hi again.

Well, it still doesn''t work reliably.

a@ask-home:~$ sudo `which btrfs` subv list /data
ERROR: Failed to lookup path for root 0 - No such file or directory

While I ran the "list" command, I had, in another terminal,
"btrfs
subv snapshot" or "btrfs subv delete" running. At the very same
time.

Which additional information should I provide?

Thanks,
Alexander

On Fri, May 3, 2013 at 1:24 PM, Alexander Skwar
<alexanders.mailinglists+nospam@gmail.com> wrote:
> Hi Russel
>
> Russell Coker <russell <at> coker.com.au> writes:
>
>> I asked a similar question about 10 days ago and got the below response
> which
>> solved it for me.
>
>
> Thanks a lot. This solved it for me as well.
>
> Cheers,
> Alexander
>
> --
> To unsubscribe from this list: send the line "unsubscribe
linux-btrfs" in
> the body of a message to majordomo@vger.kernel.org
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Alexander
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hello,
> Hi again.
> 
> Well, it still doesn''t work reliably.
> 
> a@ask-home:~$ sudo `which btrfs` subv list /data
> ERROR: Failed to lookup path for root 0 - No such file or directory
This error message should not be printed, in fact, we only print this error
message when errors except ENOENT happens.

I use the latest  btrfs-progs, and i can not reproduce the problem, would you
please
double check with this url:
https://git.kernel.org/cgit/linux/kernel/git/mason/btrfs-progs.git/

By the way, what kernel version do you use..

I just use the latest Btrfs, and hit a kernel bug but not the user-land
problems.

Thanks,
Wang
> 
> While I ran the "list" command, I had, in another terminal,
"btrfs
> subv snapshot" or "btrfs subv delete" running. At the very
same time.
> 
> Which additional information should I provide?
> 
> Thanks,
> Alexander
> 
> On Fri, May 3, 2013 at 1:24 PM, Alexander Skwar
> <alexanders.mailinglists+nospam@gmail.com> wrote:
>> Hi Russel
>> 
>> Russell Coker <russell <at> coker.com.au> writes:
>> 
>>> I asked a similar question about 10 days ago and got the below
response
>> which
>>> solved it for me.
>> 
>> 
>> Thanks a lot. This solved it for me as well.
>> 
>> Cheers,
>> Alexander
>> 
>> --
>> To unsubscribe from this list: send the line "unsubscribe
linux-btrfs" in
>> the body of a message to majordomo@vger.kernel.org
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> 
> 
> 
> -- 
> 
> 
> Alexander
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Hi Wang

On Sat, May 4, 2013 at 4:50 PM, Wang Shilong <wangshilong1991@gmail.com>
wrote:
> I use the latest  btrfs-progs, and i can not reproduce the problem, would
you please
> double check with this url:
> https://git.kernel.org/cgit/linux/kernel/git/mason/btrfs-progs.git/
Must be so, that I by accident used the "stable" version that
got shipped with Ubuntu.

If I use the one from git, I also cannot reproduce.

Thanks

Alexander
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