dm space map common: fix division bug in sm_ll_find_free_block()
This division bug meant the search for free metadata space could skip the final allocation bitmap's worth of entries. Fix affects DM thinp, cache and era targets. Cc: stable@vger.kernel.org Signed-off-by: NJoe Thornber <ejt@redhat.com> Tested-by: NMing-Hung Tsai <mtsai@redhat.com> Signed-off-by: NMike Snitzer <snitzer@redhat.com>
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