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由 NeilBrown 提交于
When MD_CHANGE_CLEAN is set we might block in md_write_start. So we should only set it when fairly sure that something will clear it. There are two places where it is set so as to encourage a metadata update to record the progress of resync/recovery. This should only be done if the internal metadata update mechanisms are in use, which can be tested by by inspecting '->persistent'. Signed-off-by: NNeilBrown <neilb@suse.de>
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