Re: btrfs send in 3.12 : can't find snapshot?

[Wang Shilong <wangsl.fnst@cn.fujitsu.com>]

Hello Michael,

I sent a patch to fix the issue(cc you already), can you have a try
and see if it fix your problem.

Thanks,
Wang
On 12/17/2013 09:28 AM, Michael Welsh Duggan wrote:
> Wang Shilong <wangshilong1991@gmail.com> writes:
>
>> Hello Michael,
>>
>>> I built the new btrfs-progs 3.12 recently.  I note that the version
>>> information doesn't seem to match this:
>>>
>>>     # ./btrfs --version
>>>     Btrfs v0.20-rc1-358-g194aa4a
>>>
>>> Regardless, I was trying to use btrfs send (which worked in the older
>>> btrfs), and failed.  Here's an example:
>>>
>>>     # ./btrfs send -vvv -p /snapshots/bo /snapshots/bp  > /dev/null
>>>     At subvol /snapshots/bp
>>>     ERROR: open @/snapshots/bp failed. No such file or directory
>>>
>>> Any idea what might be going on here?
>>>
>>> Here's the volume information:
>>>
>>>     # ./btrfs sub show /
>>>     /
>>>             Name:                   @
>>>             uuid:                   e5e505d6-1309-8447-b51e-73f08c9401d1
>>>             Parent uuid:            156f93b9-1175-dc42-a1ee-65c00c5dcc2a
>>>             Creation time:          2013-07-17 20:44:46
>>>             Object ID:              259
>>>             Generation (Gen):       296321
>>>             Gen at creation:        20
>>>             Parent:                 5
>>>             Top Level:              5
>>>             Flags:                  -
>>>             Snapshot(s):
>>>                                     snapshots/bo
>>>                                     snapshots/bp
>>>
>>> Kernel information:
>> Here it seemed that you changed your default sub-volume.(259 not 5)
>> I sent a patch before to fix this problem, it has not been pushed into
>> chris's master branch, patch url is:
>>
>> https://patchwork.kernel.org/patch/3258971/
>>
>> But is has been pushed into david's latest integration branch , you
>> can pull from:
>>
>> git pull http://github.com/kdave/btrfs-progs.git integration-20131211
> After compiling this version the above tests works.  Now, however, the
> receive fails:
>
>      # ./btrfs send -p /snapshots/bo /snapshots/bp | ./btrfs receive /backup/snapshots/root/
>      At subvol /snapshots/bp
>      At snapshot bp
>      ioctl(BTRFS_IOC_TREE_SEARCH, uuid, key 48f0ebae83fd32f1, UUID_KEY, 90139d8200afeaab) ret=-1, error: No such file or directory
>      ioctl(BTRFS_IOC_TREE_SEARCH, uuid, key 48f0ebae83fd32f1, UUID_KEY, 90139d8200afeaab) ret=-1, error: No such file or directory
>      ERROR: could not find parent subvolume
>
> More volume information:
>
> # ./btrfs sub show /backup/snapshots/root/bo
> /backup/snapshots/root/bo
>          Name:                   bo
>          uuid:                   5e15ef24-f2d0-194f-886d-3f7afc7413a4
>          Parent uuid:            9a226af3-8497-744b-90f7-d7e54d58946d
>          Creation time:          2013-12-13 17:51:57
>          Object ID:              1030
>          Generation (Gen):       1046
>          Gen at creation:        1042
>          Parent:                 5
>          Top Level:              5
>          Flags:                  readonly
>          Snapshot(s):
> # ./btrfs sub show /snapshots/bo
> /snapshots/bo
>          Name:                   bo
>          uuid:                   f132fd83-aeeb-f048-abea-af00829d1390
>          Parent uuid:            e5e505d6-1309-8447-b51e-73f08c9401d1
>          Creation time:          2013-12-13 17:50:15
>          Object ID:              404
>          Generation (Gen):       296977
>          Gen at creation:        291623
>          Parent:                 259
>          Top Level:              259
>          Flags:                  readonly
>          Snapshot(s):
> # ./btrfs sub show /snapshots/bp
> /snapshots/bp
>          Name:                   bp
>          uuid:                   6f73d3f2-5f9b-4944-b2d2-3003331b2d10
>          Parent uuid:            e5e505d6-1309-8447-b51e-73f08c9401d1
>          Creation time:          2013-12-15 22:24:57
>          Object ID:              405
>          Generation (Gen):       296977
>          Gen at creation:        296301
>          Parent:                 259
>          Top Level:              259
>          Flags:                  readonly
>          Snapshot(s):
>
>