On Mon, Aug 13 2007, Jens Axboe wrote:

quoted

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.

-- 
Jens Axboe