dwmw2 at infradead.org
Tue Mar 28 05:18:23 EST 2000
alex at cendio.se said:
> On Mon, 13 Mar 2000, David Woodhouse wrote:
> > This has to be done somewhere. Where's best - in _every_ device driver
> > or in only those front ends which attempt non-block-aligned access?
> I don't know. You seem to think that it's better to have it in the
> front-ends, and I can accept that. I think the "_every_ driver" part
> is a bit of an overstatement though, as I would think many drivers are
> for fully memory-mapped flashes where this wouldn't be necessary
> (where, in fact, looping in the frontend is unnecessary overhead).
OK. How about this:
You don't have to check the return from the mtd->write() function, it must
always write the complete buffer or return failure.
_BUT_ you may never make a write request which crosses a block boundary.
So you still have to possibly issue more than one write request in the jffs
code, but at least you can know beforehand and code accordingly, rather than
having a naïve loop.
(s/write/read/ throughout also applies, obviously.)
I'm putting together some documentation.
This will contain some changes to what's currently implemented - most notably
the notifier stuff will no longer have the horrible race conditions that it
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