On Tue, Apr 17, 2012 at 1:35 AM, Shaohua Li [off-list ref] 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.

...but I have not looked into it beyond that.

--
Dan
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