Odd BTRFS COW behaviour

[Chris Murphy]

On Jan 17, 2014, at 6:06 AM, James Hogarth <james.hogarth at gmail.com> wrote:

> 
> So far as I understand it when in the same pool cross-subvolume COW should be valid (as shown in /data on the server) - even if technically under separate mounts.

I haven't yet found anything newer than this:
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=362a20c5e27614739c4

The clone can be in different subvolumes but the source and destination must be the same mount point.

There's a similar effect with btrfs send that might be related, and it has patches upstream.

http://www.spinics.net/lists/linux-btrfs/msg30852.html



Chris Murphy

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