Miklos Szeredi <miklos@xxxxxxxxxx> writes:
> On Sun, 01 Mar 2009, Goswin von Brederlow wrote:
>> Obviously with delta storage the underlying branches really MUST be
>> read-only. As for configuration I see no problem in clasifying a
>> branch as RO, RW or D. If the user wants a modifiable RO branch then
>> he can not have any D branch. Easy enough.
>
> Not necessarily. A delta filesystem could support automatic or manual
> merges very well. This is not really possible with a writable union.
>
> Miklos
Bernd and I ment the following scenario:
/dev/sda1 /union/read-only
tmpfs /union/read-write
with a delta-fs merging the two. Then running "echo foo >
/union/read-only/path/file" could be desasterous to your data.
The underlying branch must not change on its own. The delta-fs could
change it on command but that wasn't what we where thinking of.
MfG
Goswin
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