gfs2: Fix sign extension bug in gfs2_update_stats
commit 5a5ec83d6ac974b12085cd99b196795f14079037 upstream. Commit 4d207133 changed the types of the statistic values in struct gfs2_lkstats from s64 to u64. Because of that, what should be a signed value in gfs2_update_stats turned into an unsigned value. When shifted right, we end up with a large positive value instead of a small negative value, which results in an incorrect variance estimate. Fixes: 4d207133 ("gfs2: Make statistics unsigned, suitable for use with do_div()") Signed-off-by: NAndreas Gruenbacher <agruenba@redhat.com> Cc: stable@vger.kernel.org # v4.4+ Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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