From 3a6fd1f004fcaf3dd1c28a7cd16406c8318eb64a Mon Sep 17 00:00:00 2001
From: Christoph Hellwig <hch@lst.de>
Date: Wed, 10 Sep 2014 08:23:32 -0700
Subject: [PATCH] pnfs/blocklayout: remove read-modify-write handling in
 bl_write_pagelist

Use the new PNFS_READ_WHOLE_PAGE flag to offload read-modify-write
handling to core nfs code, and remove a huge chunk of deadlock prone
mess from the block layout writeback path.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
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