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Date: Thu, 10 Oct 2013 14:14:41 +0530
From: Prashant Shah <pshah.me@gmail.com>
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Subject: copy of write for disk blocks
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Hi,

Is it feasible to add support for copy of write for disk blocks within 
the block layer itself ? Setting a flag in the struct bio will cause the 
block layer to copy the original data before over writing it.

Regards.