From: Sage Weil <sage@newdream.net>
Date: Fri, 25 Mar 2011 20:27:48 +0000 (-0700)
Subject: ceph: flush msgr_wq during mds_client shutdown
X-Git-Tag: v2.6.39-rc2~36^2~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ef550f6f4f6c9345a27ec85d98f4f7de1adce79c;p=pandora-kernel.git

ceph: flush msgr_wq during mds_client shutdown

The release method for mds connections uses a backpointer to the
mds_client, so we need to flush the workqueue of any pending work (and
ceph_connection references) prior to freeing the mds_client.  This fixes
an oops easily triggered under UML by

 while true ; do mount ... ; umount ... ; done

Also fix an outdated comment: the flush in ceph_destroy_client only flushes
OSD connections out.  This bug is basically an artifact of the ceph ->
ceph+libceph conversion.

Signed-off-by: Sage Weil <sage@newdream.net>
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