[PATCH 3/7] xfs: don't zero partial page cache pages during O_DIRECT writes

[Christoph Hellwig]

On Thu, Aug 28, 2014 at 09:49:07PM +1000, Dave Chinner wrote:
> From: Dave Chinner <dchinner at redhat.com>
> 
> 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.

Looks good,

Reviewed-by: Christoph Hellwig <hch at lst.de>