Re: [PATCH] Btrfs-progs: replace find_mount_root from send code

[Robert Buhren <robert@robertbuhren.de>]

Hi Alex,

i've made a list of all commands i executed for this test. You can find 
it here:

http://pastebin.com/y8PBgmMZ


> Hi Robert,
> do you think you can make the "root_snap_send" file of yours available
> anywhere (not sure how big it is)?
I'm afraid i've already delete it :/ sry. But in the pastebin there 
should be all the commands
you need to execute to reproduce my setup.
>
> Also, I am not sure I understand how you btrfs tree looks like WRT to
> where all subvolumes are mounted (but all others seem to understand
> well).
>
> You mentioned:
>> /dev/loop0 on /mnt/TEST_ROOT type btrfs (rw,relatime,compress=lzo,space_cache)  # default-subvolume
>> /dev/loop0 on /mnt/TEST_ROOT/root_volid0 type btrfs (rw,relatime,compress=lzo,space_cache) # subvolid= 0
>> /dev/loop1 on /mnt/TEST_ROOT/backup_volid0 type btrfs (rw,relatime,compress=lzo,space_cache)
>> btrfs subvolume snapshot -r /mnt/TEST_ROOT/root_volid0/root/ /mnt/TEST_ROOT/root_volid0/root_snap
> Are you trying to snapshot a directory here? I.e., what is "root"
> within "root_volid0"?
root is a subvolume inside the /dev/loop0 fs. It is set as the default 
subvolume.
I mounted /dev/loop0 at /mnt/TEST_ROOT and inside that i mounted 
/dev/loop0 again,
but this time with subvolid=0. So "/mnt/TEST_ROOT/root_volid0/root" is 
actually a subvolume
which is also mounted at "/mnt/TEST_ROOT".
> Can you pls list all subvolumes you have on your source filesystem
> (the one you are trying to backup), and where each one is mounted?
> Again, looks like I'm the only one confused about this, so apologies.
>
> You can also possibly use the "tree" utility to better visualize your
> fs tree, like:
> tree -A  --inodes --noreport /mnt/TEST_ROOT
>
> Jan, David, hope it's ok with you if I'll try to debug this.
>
> Thanks,
> Alex.
>
I'm kinda in a hurry now because i'm leaving for Holidays soon and i 
still have to finish my bachelor thesis :P

I hope with the the commands from the pastebin you have everything you 
need. I can answer emails until Friday morning.

Regards,

Robert


>
>
>
>
> On Sat, Aug 25, 2012 at 11:24 AM, Robert Buhren <robert@robertbuhren.de> wrote:
>> On 24.08.2012 15:33, David Sterba wrote:
>>> On Thu, Aug 23, 2012 at 10:54:54AM +0200, Robert Buhren wrote:
>>>> I'm on linux-3.6-rc2 and btrfs-progs from git.
>>> Please try it with Chris' for-linus branch, it contains a fair portion
>>> of send-related fixes and from brief look they may be related to the
>>> errors you see.
>>>
>>> david
>> Hi David,
>>
>> i just tried it with a kernel from the "for-linus" branch. But i still get
>> the same error.
>> Just to be sure:
>> You ment this branch:
>> http://git.kernel.org/?p=linux/kernel/git/mason/linux-btrfs.git;a=shortlog;h=refs/heads/for-linus
>>
>> right?
>>
>>
>> Regards,
>>
>> Robert
>>
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