From e339c1a7c09ef736dca7b3a4353c7742557d9f8f Mon Sep 17 00:00:00 2001
From: "Martin K. Petersen" <martin.petersen@oracle.com>
Date: Thu, 26 Nov 2009 12:00:40 -0500
Subject: [PATCH] [SCSI] sd: WRITE SAME(16) / UNMAP support

Implement a function for handling discard requests that sends either
WRITE SAME(16) or UNMAP(10) depending on parameters indicated by the
device in the block limits VPD.

Extract unmap constraints and report them to the block layer.

Based in part by a patch by Christoph Hellwig <hch@lst.de>.

Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
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