Re: Reviewing ext3 improvement patches (delalloc, mballoc, extents)

[Werner Almesberger <werner@almesberger.net>]

Bryan Henderson wrote:
> I think "reservation" is wrong for one of them and anyone using it that 
> way should stop.

Hehe, start with ext3 :-)

> I believe the common terminology is:

Sounds reasonable. The thing with "reservation" is that people use
it in daily life with all kinds of meanings, and often with the
object of the reservation, e.g. "reserve a seat" (typically a
specific seat), "reserve some time" (often not a specific interval),
or "reserve a table" (at a restaurant, you don't know which one,
but the restaurant staff does).

To muddy the issue further, reservations can be more or less firm.
E.g. if we "reserve" the next hundred blocks, so that allocation is
contiguous, we may want to be able to take them away if some other
file needs them. On the other hand, if storage is already committed,
but just not on disk yet, that reservation shouldn't be revokable.

- Werner

-- 
  _________________________________________________________________________
 / Werner Almesberger, Buenos Aires, Argentina     werner@almesberger.net /
/_http://www.almesberger.net/____________________________________________/


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