Re: problems with btrfs send / restore

[Alex Lyakas <alex.btrfs@zadarastorage.com>]

Hi Stefan,

Is /btrfs/target/\@snapshot/ a subvolume or a directory?

can you pls try the patch that I posted here:
http://www.spinics.net/lists/linux-btrfs/msg19583.html

I feel that you're hitting a similar issue here. Before you apply the
patch, please verify that you have /etc/mtab on your system (I will
make a more formal patch later).

Thanks,
Alex.


On Mon, Oct 15, 2012 at 9:21 PM, Stefan Priebe <s.priebe@profihost.ag> wrote:
> Am 15.10.2012 12:16, schrieb Miao Xie:
>
>> On      thu, 11 Oct 2012 21:54:48 +0200, Stefan Priebe wrote:
>>>
>>> Am 11.10.2012 21:43, schrieb David Sterba:
>>>>
>>>> On Thu, Oct 11, 2012 at 09:33:54PM +0200, Stefan Priebe wrote:
>>>>>
>>>>> [server: /btrfs/target]# btrfs send -i /btrfs/src/\@snapshot/1
>>>>> /btrfs/src/\@snapshot/2 | btrfs receive /btrfs/target/\@snapshot/
>>>>> At subvol /btrfs/src/@snapshot/2
>>>>> At subvol 2
>>>>> ERROR: failed to open /btrfs/target/@snapshot/@snapshot/1/test.tar. No
>>>>> such file or directory
>>>>
>>>>                                         ^^^^^^^^^^^^^^^^^^^
>>>>
>>>> I wonder if this is the ghost snapshot dir entry that Miao fixed. Did
>>>> somehow get into the 'send' stream and confused the receive side.
>>>>
>>>> david
>>>
>>>
>>> i missed two facts:
>>> 1.) vanilla kernel 3.6.1
>>> 2.) latest btrfs tools git (cloned at 10/10/2012)
>>
>>
>> Sorry, I can not reproduce this problem, could you send me the detailed
>> steps?
>
>
> mhm there is nothing special. But i try to provide more information / a
> small howto:
>
> # mount |grep btrfs
> /dev/sdb on /btrfs/src type btrfs (rw)
> /dev/sdc on /btrfs/target type btrfs (rw)
>
> # btrfs subvolume list /btrfs/target/
> # btrfs subvolume list /btrfs/src/
> ID 277 top level 5 path @snapshot/1
> ID 278 top level 5 path @snapshot/2
> ID 288 top level 5 path @snapshot/3
>
> # btrfs send /btrfs/src/\@snapshot/1 | btrfs receive
> /btrfs/target/\@snapshot/
> At subvol /btrfs/src/@snapshot/1
> At subvol 1
> #
>
> Now i was trying to send an incremental snapshot:
>
> # btrfs send -i /btrfs/src/\@snapshot/1 /btrfs/src/\@snapshot/2 | btrfs
> receive /btrfs/target/\@snapshot/
> At subvol /btrfs/src/@snapshot/2
> At subvol 2
> ERROR: failed to open /btrfs/target/@snapshot/@snapshot/1/test.tar. No such
> file or directory
> #
>
> Greets,
>
> Stefan
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