From: Dave Chinner <dchinner@redhat.com>
Date: Tue, 2 Sep 2014 02:12:52 +0000 (+1000)
Subject: xfs: don't zero partial page cache pages during O_DIRECT writes
X-Git-Tag: fixes-v3.17-rc4~15^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=834ffca6f7e345a79f6f2e2d131b0dfba8a4b67a;p=pandora-kernel.git

xfs: don't zero partial page cache pages during O_DIRECT writes

Similar to direct IO reads, direct IO writes are using
truncate_pagecache_range to invalidate the page cache. This is
incorrect due to the sub-block zeroing in the page cache that
truncate_pagecache_range() triggers.

This patch fixes things by using invalidate_inode_pages2_range
instead.  It preserves the page cache invalidation, but won't zero
any pages.

cc: stable@vger.kernel.org
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dave Chinner <david@fromorbit.com>
---

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