From: ike Snitzer <snitzer@redhat.com>
Date: Sun, 8 Aug 2010 16:11:33 +0000 (-0400)
Subject: block: update request stacking methods to support discards
X-Git-Tag: v2.6.36-rc1~288^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3383977fadc4027f20907f6208a9033cd043adab;p=pandora-kernel.git

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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