Re: btrfs equivalent for zfs send -R

["Γιώργος Πάλλας" <gpall@it.auth.gr>]

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On 28/02/16 05:45, Duncan wrote:
> Γιώργος Πάλλας posted on Sat, 27 Feb 2016 13:45:03 +0200
> as excerpted:
>
>> Hi all.
>>
>> If I have a btrfs subvolume 'subv' and then subvolumes subv/sub1,
>> subv/sub2, subv/sub3, is there a way to snapshot all the subv tree and
>> then recursively send it remotely?
>>
>> I think this would be the analogous of zfs snapshot -r, and then zfs
>> send -R.
> As a list regular and btrfs user myself, but not a dev...
>
> No idea about zfs and my own btrfs use-case doesn't use btrfs send/
> receive either, so this is primarily from previous list posts, with a
> quick look at the (v4.4.1) btrfs-send manpage as well...
>
> Recursive send isn't yet supported, only one at a time.
>
> Based on a previous comment from someone who apparently looked at the
> code (but isn't a btrfs dev either), there's possibly some code for -r
> (recursive) already in the repo (or maybe it's simply a comment reserving
> the -r option?), but it doesn't work yet.
>
> However, it shouldn't be horribly difficult to hack up scripts that
> automate the otherwise manual recursive-send/receive for you, as I'd very
> likely do myself if I needed that functionality. =:^)
>

Thanks for the reply Duncan.

The problem with scripting the recursive process, as I understand it, is 
that in the case of e.g. adding an identical file inside each one sub 
subvolume, this file would have to be transmitted during send, so many 
times as the number of the sub subvolumes, which of course is not 
viable. Am I right?

Giorgos



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