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Re: Quota on tmpfs
On Fri, Jul 13, 2012 at 10:15:55AM +0200, Francois Tigeot wrote:
> > I suspect people used to traditional quota systems will not entirely
> > like the idea of a quota system that has no persistent storage... but
> > I'm not about to tell you that what you're doing is wrong :-)
> Oh, the system is not completely done yet. My goal was to first implement
> accounting and limit enforcement; persistency can be added later ;-)
Well... yes, but it's a significant part of the implementation.
> The quickest way is to save usage counters and limits in a regular file like
> the old BSD quota system used to do it.
> This can even be done in userland.
Limits, yes; saving the usage data in userland is problematic, because
it's likely to end up inconsistent with the filesystem.
Although I suppose if you're willing to run quotacheck on every boot,
this doesn't matter much. (tip though: quotacheck is inherently slow)
Are you likely to adopt the new NetBSD quota(3) library interface? It
may be a little more complicated, but it will let you import the
traditional quota tools from NetBSD instead of rewriting them and save
you from having to port a few pieces of 3rd-party software... and it
shouldn't constrain your implementation much.
David A. Holland
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