From: Yan, Zheng <zheng.z.yan@intel.com>
Date: Wed, 24 Jul 2013 04:22:11 +0000 (+0800)
Subject: ceph: fix freeing inode vs removing session caps race
X-Git-Tag: v3.12-rc1~90^2~30
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6f60f889470aecf747610279545c054a99aadca3;p=pandora-kernel.git

ceph: fix freeing inode vs removing session caps race

remove_session_caps() uses iterate_session_caps() to remove caps,
but iterate_session_caps() skips inodes that are being deleted.
So session->s_nr_caps can be non-zero after iterate_session_caps()
return.

We can fix the issue by waiting until deletions are complete.
__wait_on_freeing_inode() is designed for the job, but it is not
exported, so we use lookup inode function to access it.

Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>
---

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