From: Alex Elder <elder@inktank.com>
Date: Mon, 25 Mar 2013 16:54:30 +0000 (-0500)
Subject: libceph: initialize data fields on last msg put
X-Git-Tag: omap-for-v3.10/dt-fixes-for-merge-window~26^2~176
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=888334f966fab232fe9158c2c2f0a935e356b583;p=pandora-kernel.git

libceph: initialize data fields on last msg put

When the last reference to a ceph message is dropped,
ceph_msg_last_put() is called to clean things up.

For "normal" messages (allocated via ceph_msg_new() rather than
being allocated from a memory pool) it's sufficient to just release
resources.  But for a mempool-allocated message we actually have to
re-initialize the data fields in the message back to initial state
so they're ready to go in the event the message gets reused.

Some of this was already done; this fleshes it out so it's done
more completely.

This resolves:
    http://tracker.ceph.com/issues/4540

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Sage Weil <sage@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
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