Re: [RFC 1/2] MD: raid5 trim support

[Shaohua Li <shli@xxxxxxxxxx>]

Hi Dan,
On 4/17/12 10:46 PM, Dan Williams wrote:
> On Tue, Apr 17, 2012 at 1:35 AM, Shaohua Li<shli@xxxxxxxxxx>  wrote:
> > Discard for raid4/5/6 has limitation. If discard request size is small, we do
> > discard for one disk, but we need calculate parity and write parity disk.  To
> > correctly calculate parity, zero_after_discard must be guaranteed.
>
> I'm wondering if we could use the new bad blocks facility to mark
> discarded ranges so we don't necessarily need determinate data after
> discard.

It would be great the limitation can be avoided and the code can be
simplified. I didn't follow linux-raid maillist, can you point me the url
of the new bad blocks facility please?

Thanks,
Shaohua
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