On Fri, 22 Aug 2008 11:58:16 +0100
David Woodhouse <dwmw2@xxxxxxxxxxxxx> wrote:
> On Fri, 2008-08-22 at 12:50 +0200, Jens Axboe wrote:
> > > I suspect we need a separate 'max_discard_sectors' field.
> >
> > No, that is what max_hw_sectors is for.
>
> I thought Pierre's problem is that he has _different_ limits for
> discards vs. read/writes?
>
Indeed. max_hw_sectors is _not_ used for "maximum number of sectors" in
most cases, but for "maximum number of bytes the device can transfer".
The difference between the two is irrelevant for data requests, but is
evident here.
--
-- Pierre Ossman
Linux kernel, MMC maintainer http://www.kernel.org
rdesktop, core developer http://www.rdesktop.org
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