From: Sage Weil <sage@newdream.net>
Date: Fri, 16 Sep 2011 18:13:17 +0000 (-0700)
Subject: libceph: fix linger request requeuing
X-Git-Tag: v3.1-rc9~15^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=935b639a049053d0ccbcf7422f2f9cd221642f58;p=pandora-kernel.git

libceph: fix linger request requeuing

The r_req_lru_item list node moves between several lists, and that cycle
is not directly related (and does not begin) with __register_request().
Initialize it in the request constructor, not __register_request(). This
fixes later badness (below) when OSDs restart underneath an rbd mount.

Crashes we've seen due to this include:

[  213.974288] kernel BUG at net/ceph/messenger.c:2193!

and

[  144.035274] BUG: unable to handle kernel NULL pointer dereference at 0000000000000048
[  144.035278] IP: [<ffffffffa036c053>] con_work+0x1463/0x2ce0 [libceph]

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