Re: [PATCH] BTRFS-PROG: recursively subvolume snapshot and delete

[Konstantinos Skarlatos <k.skarlatos@gmail.com>]

On 26/11/2013 7:44 μμ, Goffredo Baroncelli wrote:
> On 2013-11-26 16:12, Konstantinos Skarlatos wrote:
>> On 25/11/2013 11:23 μμ, Goffredo Baroncelli wrote:
>>> Hi all,
>>>
>>> nobody is interested in these new features ?
>> Is this ZFS-style recursive snapshotting? If yes, i am interested, and
>> thanks for your great work :)
> No it is not equal. My recursive snapshotting is not atomic as the ZFS
> one; every subvolume snapshot is atomic, but each snapshot is taken at
> different time.
For my use case that is not a problem, but others may disagree
>
> BR
> G.Baroncelli
>
>>> On 2013-11-16 18:09, Goffredo Baroncelli wrote:
>>>> Hi All,
>>>>
>>>> the following patches implement the recursively snapshotting and
>>>> deleting of a subvolume.
>>>>
>>>> To snapshot recursively you must pass the -R switch:
>>>>
>>>> # btrfs subvolume create sub1
>>>> Create subvolume './sub1'
>>>> # btrfs subvolume create sub1/sub2
>>>> Create subvolume 'sub1/sub2'
>>>>
>>>> # btrfs subvolume snapshot -R sub1 sub1-snap
>>>> Create a snapshot of 'sub1' in './sub1-snap'
>>>> Create a snapshot of 'sub1/sub2' in './sub1-snap/sub2'
>>>>
>>>> To recursively delete subvolumes, you must pass the switch '-R':
>>>>
>>>> # btrfs subvolume create sub1
>>>> Create subvolume './sub1'
>>>> # btrfs subvolume create sub1/sub2
>>>> Create subvolume 'sub1/sub2'
>>>>
>>>> # btrfs subvolume delete -R sub1
>>>> Delete subvolume '/root/sub1/sub2'
>>>> Delete subvolume '/root/sub1'
>>>>
>>>>
>>>> Some caveats:
>>>> 1) the recursively behaviour need the root capability
>>>> This because how the subvolume are discovered
>>>>
>>>> 2) it is not possible to recursively snapshot a subvolume
>>>> in read-only mode
>>>> This because when a subvolume is snapshotted, its
>>>> nested subvolumes appear as directory in the snapshot.
>>>> These directories are removed before snapshotting the
>>>> nested subvolumes. This is incompatible with a read
>>>> only subvolume.
>>>>
>>>> BR
>>>> G.Baroncelli
>>>>
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>