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COW: Extend checking allocated bits to beyond one sector
cow_co_is_allocated() only checks one sector's worth of allocated bits before returning. This is allowed but (slightly) inefficient, so extend it to check all of the file's metadata sectors. Signed-off-by: Charlie Shepherd <charlie@ctshepherd.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> [kwolf: silenced compiler warning (-Wmaybe-uninitialized for changed)] Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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