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

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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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