From: Hugo Mills <hugo@carfax.org.uk>
To: Marc MERLIN <marc@merlins.org>
Cc: linux-btrfs@vger.kernel.org
Subject: Re: btrfs receive: could not find parent subvolume
Date: Thu, 18 Sep 2014 16:39:34 +0100 [thread overview]
Message-ID: <20140918153934.GA9830@carfax.org.uk> (raw)
In-Reply-To: <20140918152718.GA27983@merlins.org>
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On Thu, Sep 18, 2014 at 08:27:18AM -0700, Marc MERLIN wrote:
> While debugging a btrfs send/receive slow problem, I now getting this:
> legolas:/mnt/btrfs_pool1# btrfs send -p tmp_ggm_daily_ro.20140917_06:29:58 tmp_ggm_daily_ro.20140918_02:48:24 | ssh gargamel btrfs receive -v /mnt/btrfs_pool2/backup/debian64/legolas
> At subvol tmp_ggm_daily_ro.20140918_02:48:24
> At snapshot tmp_ggm_daily_ro.20140918_02:48:24
> receiving snapshot tmp_ggm_daily_ro.20140918_02:48:24 uuid=5d1f0454-1be3-b648-9ea5-dc427cd62d98, ctransid=310713 parent_uuid=d86e69bf-e17f-7f4c-bfb7-e571d5824687, parent_ctransid=308332
> ERROR: could not find parent subvolume
>
> The parent is there on the other side, but UUID is different:
> gargamel:/mnt/btrfs_pool2/backup/debian64/legolas# btrfs subvolume show tmp_ggm_daily_ro.20140917_06:29:58
> /mnt/btrfs_pool2/backup/debian64/legolas/tmp_ggm_daily_ro.20140917_06:29:58
> Name: tmp_ggm_daily_ro.20140917_06:29:58
> uuid: 3d424a2b-69da-244c-bfcc-c283f9cc1f34
> Parent uuid: 05d3b9be-bfe2-bb4a-9f6a-64b9d44896c7
> Creation time: 2014-09-17 06:30:01
> Object ID: 7873
> Generation (Gen): 83621
> Gen at creation: 83476
> Parent: 263
> Top Level: 263
> Flags: -
> Snapshot(s):
>
> Now it seems that the UUID is different on all my snapshots created by
> btrfs send, so maybe it doesn't match UUID?
>
> Given that, what is btrfs receive using to get a match?
There's a "recieved UUID" field on each subvolume. I posted a patch
to userspace a couple of weeks ago which adds a -R option to show it.
I don't think it's filtered through David's backlog yet.
Hugo.
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next prev parent reply other threads:[~2014-09-18 15:39 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-18 15:27 btrfs receive: could not find parent subvolume Marc MERLIN
2014-09-18 15:39 ` Hugo Mills [this message]
2014-09-18 16:07 ` Marc MERLIN
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