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ceph: fix mdsmap decode when there are MDS's beyond max_mds
commit 0e24421 upstream. If the max_mds is decreased in a cephfs cluster, there is a window of time before the MDSs are removed. If a map goes out during this period, the mdsmap may show the decreased max_mds but still shows those MDSes as in or in the export target list. Ensure that we don't fail the map decode in that case. Cc: stable@vger.kernel.org URL: https://tracker.ceph.com/issues/52436 Fixes: d517b39 ("ceph: reconnect to the export targets on new mdsmaps") Signed-off-by: Xiubo Li <xiubli@redhat.com> Reviewed-by: Jeff Layton <jlayton@kernel.org> Signed-off-by: Ilya Dryomov <idryomov@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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