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SubjectRe: Adding snapshot capability to Linux
Alexander Viro wrote:

>You _can't_ get consistent snapshots without cooperation from fs. LVM,
>EVMS, whatever. Only filesystem knows what IO needs to be pushed to
>make what we have on device consistent and what IO needs to be held
>back. Neither VFS nor device driver do not and can not have such
>knowledge - it depends both on fs layout and on implementation details.
>

My idea was to "catch" functions for writing to fs (file/metadata) and
hold them till I copy file/metadata to snapshot. I thought that when
done in the correct place this could work with virtualy any "normal" fs...

Libor


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