Re: ext4 features

[Pavel Machek]

Hi!

> > > > Add a salvagable file system to ext4, i.e. when a file is deleted, you 
> > > > just rename it and move it to a directory called DELETED.SAV and recycle 
> > > > the files as people allocate new ones.  Easy to do (internal "mv" of 
> > > 
> > > 
> > > Easily doable in userspace, why bother with kernel programming
> > 
> > Yes and no. A simple mv is better done in userspace, but what I'd
> > _really_ appreciate would be a true kernel salvage (similar to the way
> > NetWare does things). That means marking the file as deleted in the

I have code doing ld_preload tricks to force safe deletion... somewhere.

> Wouldn't such a scheme interfere with the block allocator algorithms,
> and hence increase the risk of fragmentation? Schemes like this realy
> put my hairs on end,
> 
>   1) if you don't want to lose your data, make backups; 
>   2) if I mean to delete a file, I want it gone proper. Silently keeping
>      it about is not unix like;

Well, mc supports undelete on ext2 for a *long* time. And it works
okay...

And yes, doing echo > important_file instead of echo >> important file
is way too easy with unix shells.

						Pavel
-- 
Thanks for all the (sleeping) penguins.
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