[uml-devel] Re: [uml-user] one drawback to using cows commercially...

[BlaisorBlade <blaisorblade_spam@yahoo.it>]

Alle 04:17, martedì 30 marzo 2004, Jeff Dike ha scritto:
> tim@unclewebster.com said:
> > Is there any clever way to reset the root password for users, aside
> > from  deleting the cow? "linux single" is fine, but aside from that?
>
> I'm finishing up a new hostfs-like filesystem which I want to become the
> preferred mechanism to boot UMLs because of its ability to mmap data from
> the host, eliminating duplicate copies of file data in memory.
>
> A side-effect of this is that UML filesystems will become visible on the
> host, so password changing would be a matter of chrooting to the filesystem
> and running passwd.
>
> Currently, there is no COW functionality, but I plan to add file-level
> COWing with block-level COWing possibly following later.

Have you heard of the discussion about COWlinks? I.e. creating a Copy - On - 
Write functionality for hard links? Or do you want to rewrite files one page 
at a time (i.e. if I change one byte inside a file, only the "page" 
containing that byte is copied and changed)?

http://lwn.net/Articles/77215/

-- 
Paolo Giarrusso, aka Blaisorblade
Linux registered user n. 292729




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