please add "ceph: update readpages osd request according to size of pages" to 4.9.x

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Subject: please add "ceph: update readpages osd request according to size of pages" to 4.9.x
From: "Yan, Zheng" <zyan@xxxxxxxxxx>
Date: Mon, 6 Mar 2017 09:45:02 +0800

commit d641df819db8b80198fd85d9de91137e8a823b07 upstreamed

The bug was introduce in 4.9 kernel by commit 1afe478569ba7414dde8a874dda9c1ea621c0c63. It can cause buffered read hang.

Thanks
Yan, Zheng

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