From 48fec5d0a504dfbb302cb1dd24ebb0b82a46cce9 Mon Sep 17 00:00:00 2001
From: "Yan, Zheng" <zyan@redhat.com>
Date: Wed, 1 Jul 2015 16:27:46 +0800
Subject: [PATCH] ceph: EIO all operations after forced umount

This patch makes try_get_cap_refs() and __do_request() check
if the file system was forced umount, and return -EIO if it was.
This patch also adds a helper function to drops dirty caps and
wakes up blocking operation.

Signed-off-by: Yan, Zheng <zyan@redhat.com>
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