Re: [fuse-devel] delta filesystem prototype

[Goswin von Brederlow <goswin-v-b@web.de>]

Miklos Szeredi <miklos@szeredi.hu> writes:

> Here is my first try at a "delta" filesystem.  It takes two
> directories, one of which is a read-only base, and the other is where
> the differences are stored.  It stores data, metadata and directory
> modifications without copying up whole files from the read-only
> branch.
>
> The layout of the delta store may look similar to the writable branch
> of a union fs, but this is basically just coincidence (it was easier
> to start out this way).
>
> Currently it's implemented with fuse and it's not optimized at all, so
> performance may suck in some cases.  But I think this is a useful
> concept and a better model, than trying to fit writable branches into
> a union filesystem.
>
> Comments, bug reports are welcome.
>
> Thanks,
> Miklos

Wouldn't it make more sense to start with unionfs-fuse and add a delta
feature to it? unionfs-fuse already has all you need except that it
will copy the whole file (if on a read-only branch) on write.

MfG
        Goswin