From 3383977fadc4027f20907f6208a9033cd043adab Mon Sep 17 00:00:00 2001
From: ike Snitzer <snitzer@redhat.com>
Date: Sun, 8 Aug 2010 12:11:33 -0400
Subject: [PATCH] block: update request stacking methods to support discards

Propagate REQ_DISCARD in cmd_flags when cloning a discard request.
Skip blk_rq_check_limits's existing checks for discard requests because
discard limits will have already been checked in blkdev_issue_discard.

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
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