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SubjectRe: Distributed storage.
On Monday 13 August 2007 00:45, Jens Axboe wrote:
> On Mon, Aug 13 2007, Jens Axboe wrote:
> > > You did not comment on the one about putting the bio destructor
> > > in the ->endio handler, which looks dead simple. The majority of
> > > cases just use the default endio handler and the default
> > > destructor. Of the remaining cases, where a specialized
> > > destructor is needed, typically a specialized endio handler is
> > > too, so combining is free. There are few if any cases where a
> > > new specialized endio handler would need to be written.
> >
> > We could do that without too much work, I agree.
> But that idea fails as well, since reference counts and IO completion
> are two completely seperate entities. So unless end IO just happens
> to be the last user holding a reference to the bio, you cannot free
> it.

That is not a problem. When bio_put hits zero it calls ->endio instead
of the destructor. The ->endio sees that the count is zero and
destroys the bio.


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