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由 Ján Tomko 提交于
Return -1: * on all failures of fdatasync. Instead of propagating -errno all the way up to the virStorageVolWipe API, which is documented to return 0 or -1. * after a partial wipe. If safewrite failed, we would re-use the non-negative return value of lseek (which should be 0 in this case, because that's the only offset we seek to).
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