From: Ilya Dryomov <ilya.dryomov@inktank.com>
Date: Tue, 13 May 2014 07:19:27 +0000 (+0400)
Subject: rbd: make sure we have latest osdmap on 'rbd map'
X-Git-Tag: omap-for-v3.16/fixes-against-rc1~24^2~8
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=30ba1f020221991cf239d905c82984958f29bdfe;p=pandora-kernel.git

rbd: make sure we have latest osdmap on 'rbd map'

Given an existing idle mapping (img1), mapping an image (img2) in
a newly created pool (pool2) fails:

    $ ceph osd pool create pool1 8 8
    $ rbd create --size 1000 pool1/img1
    $ sudo rbd map pool1/img1
    $ ceph osd pool create pool2 8 8
    $ rbd create --size 1000 pool2/img2
    $ sudo rbd map pool2/img2
    rbd: sysfs write failed
    rbd: map failed: (2) No such file or directory

This is because client instances are shared by default and we don't
request an osdmap update when bumping a ref on an existing client.  The
fix is to use the mon_get_version request to see if the osdmap we have
is the latest, and block until the requested update is received if it's
not.

Fixes: http://tracker.ceph.com/issues/8184

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