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由 Charlie Shepherd 提交于
Process a whole sector's worth of COW bits by reading a sector, setting the bits after skipping any already set bits, then writing it out again. Make sure we only flush once before writing metadata, and only if we need to write metadata. Signed-off-by: NCharlie Shepherd <charlie@ctshepherd.com> Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>
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