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Re: BTRFS file clone support for cp

From: Giuseppe Scrivano
Subject: Re: BTRFS file clone support for cp
Date: Mon, 27 Jul 2009 21:41:19 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/23.0.96 (gnu/linux)

Jim Meyering <address@hidden> writes:

>> Another possible issue with this I can think of is
>> depending on the modification pattern of the COW files,
>> the modification processes could fragment the file or
>> more seriously be given ENOSPC errors.
> I hope btrfs takes care of this behind the scene.
> How does the clone work wrt to space consumed, a la df?
> If copying a 1GB file this way does not update usage
> stats to reflect the additional 1GB of space used, ...

I tried to clone a big file and df reported a different "used blocks"
stat that it was before the clone operation.


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