From 61f68816211ee4b884dc0dda8dd4d977548f4865 Mon Sep 17 00:00:00 2001
From: "Yan, Zheng" <zheng.z.yan@intel.com>
Date: Thu, 28 Nov 2013 14:28:14 +0800
Subject: [PATCH] ceph: check caps in filemap_fault and page_mkwrite

Adds cap check to the page fault handler. The check prevents page
fault handler from adding new page to the page cache while Fcb caps
are being revoked. This solves Fc revoking hang in multiple clients
mmap IO workload.

Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>
Reviewed-by: Sage Weil <sage@inktank.com>
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