From: Andy Lutomirski <luto@mit.edu>
To: Chris Mason <chris.mason@oracle.com>,
Josef Bacik <josef@redhat.com>,
"Yan, Zheng" <zheng.yan@oracle.com>,
linux-btrfs@vger.kernel.org
Subject: Re: snapshot/subvol deletion
Date: Wed, 26 Aug 2009 23:47:25 -0400 [thread overview]
Message-ID: <4A9601CD.8040005@mit.edu> (raw)
In-Reply-To: <20090825160414.GC16561@think>
Chris Mason wrote:
>
> ;) The problem is the directory entry for the snapshot, but its a little
> more complex. Lets say subvolA has a directory entry for snapshotZ, and
> then someone wanders in and snapshots subvolA, creating snapshotA'.
>
> This means that both subvolA and snashotA' have a directory entry for
> snapshotZ. If we delete snapshotZ we have to deal with both directory
> entries.
I would've expected that, if we delete snapshotZ by IOCTL / rmdir /
whatever from within snapshotA', then it still exists until it's also
deleted from (the original) subvolA. But maybe I just don't get it.
Is there some end-user-oriented documentation on what the semantics of
snapshots and subvolumes are supposed to be? I couldn't find it with a
bit of Googling and wiki reading.
--Andy
next prev parent reply other threads:[~2009-08-27 3:47 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-08-25 14:38 snapshot/subvol deletion Yan, Zheng
2009-08-25 15:03 ` Chris Mason
2009-08-25 15:53 ` Josef Bacik
2009-08-25 16:04 ` Chris Mason
2009-08-27 3:47 ` Andy Lutomirski [this message]
2009-08-26 5:25 ` Yan, Zheng
2009-08-26 6:50 ` Chris Mason
2009-08-26 9:19 ` Yan, Zheng
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