From: Ilya Dryomov <ilya.dryomov@inktank.com>
Date: Mon, 3 Feb 2014 11:56:33 +0000 (+0200)
Subject: libceph: take map_sem for read in handle_reply()
X-Git-Tag: v3.14-rc2~11^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ff513ace9b772e75e337f8e058cc7f12816843fe;p=pandora-kernel.git

libceph: take map_sem for read in handle_reply()

Handling redirect replies requires both map_sem and request_mutex.
Taking map_sem unconditionally near the top of handle_reply() avoids
possible race conditions that arise from releasing request_mutex to be
able to acquire map_sem in redirect reply case.  (Lock ordering is:
map_sem, request_mutex, crush_mutex.)

Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
Reviewed-by: Sage Weil <sage@inktank.com>
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