Re: BTRFS file clone support for cp

[Giuseppe Scrivano]

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.


Cheers,
Giuseppe