RFC: Btrfs snapshots feature for F13

[Peter Jones]

On 11/17/2009 02:48 AM, Jeff Garzik wrote:
> On 11/17/2009 02:43 AM, nodata wrote:
>> Am 2009-11-17 01:55, schrieb Chris Ball:
>>> Hi,
>>>
>>> I've written up a draft of an F13 filesystem rollback feature using
>>> Btrfs snapshots that are automatically created by yum:
>>>
>>> https://fedoraproject.org/wiki/Features/SystemRollbackWithBtrfs
>>>
>>> It'd be great to get feedback on whether this is the right idea, and
>>> how exactly the UI interaction should work, before submitting this
>>> formally.
>>>
>>> Thanks!
>>>
>>> - Chris.
>>
>> So this will confuse things a lot if the user doesn't have only rpm
>> stuff on one partition, and everything else on another. This is
>> potentially a major risk. How would that be handled?
> 
> Mr. nodata,
> 
> As the URL notes under "Detailed Description," that is not handled at
> all.  It wraps all file I/O, yum or not, into the snapshot.
> 
> A bloody awful solution, especially when you consider that btrfs'
> maintainer Chris Mason is adding support for real userland transactions
> (via some additional ioctls).

Do they support rollbacks after commit?  If they don't, they're not
really as useful for this as they could be.

If they do, that'd be really interesting for upgrades.

-- 
        Peter

If you're not part of the solution, then you're part of the precipitate.