Re: ext4 features

[H. Peter Anvin]

Bill Davidsen wrote:
> > DC> Easily doable in userspace, why bother with kernel programming
> >
> > In userspace you can't automatically delete the files when the space
> > becomes needed. The LD_PRELOAD/glibc methods also have the
> > disadvantage of having to figure out where a file goes when it's
> > deleted, depending on which device it happens to reside on. Demanding
> > read access to /proc/mounts just to do rm could cause problems.
> >
> > Userspace has had 10 years to invent a good solution. If it was so
> > easy, it would probably have been done.
> Actually, if it were so important it WOULD have been done. I suspect 
> that the issue is not lack of a good solution, but lack of a good 
> problem. The behavior you propose requires a lot of kernel cleverness, 
> including make the inodes seem to go away, so the count is "right" for 
> what the user sees.

The real solution for it is snapshots.

	-hpa
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