From: Tao Ma <tao.ma@oracle.com>
Date: Wed, 23 Jun 2010 23:43:57 +0000 (+0800)
Subject: block: Don't count_vm_events for discard bio in submit_bio.
X-Git-Tag: v2.6.35-rc4~43^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1b99973f1c82707e46e8cb9416865a1e955e8f8c;p=pandora-kernel.git

block: Don't count_vm_events for discard bio in submit_bio.

In submit_bio, we count vm events by check READ/WRITE.
But actually DISCARD_NOBARRIER also has the WRITE flag set.
It looks as if in blkdev_issue_discard, we also add a
page as the payload and the bio_has_data check isn't enough.
So add another check for discard bio.

Signed-off-by: Tao Ma <tao.ma@oracle.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
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