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commit3890dce1d3upstream. If your data pool was pool 0, ceph_file_layout_from_legacy() transform that to -1 unconditionally, which broke upgrades. We only want do that for a fully zeroed ceph_file_layout, so that it still maps to a file_layout_t. If any fields are set, though, we trust the fl_pgpool to be a valid pool. Fixes:7627151ea3("libceph: define new ceph_file_layout structure") Link: http://tracker.ceph.com/issues/17825 Signed-off-by: Yan, Zheng <zyan@redhat.com> Signed-off-by: Ilya Dryomov <idryomov@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>