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} mirror_top_bs->total_sectors = bs->total_sectors; - mirror_top_bs->supported_write_flags = BDRV_REQ_WRITE_UNCHANGED; - mirror_top_bs->supported_zero_flags = BDRV_REQ_WRITE_UNCHANGED; + mirror_top_bs->supported_write_flags = BDRV_REQ_WRITE_UNCHANGED | + (BDRV_REQ_FUA & bs->supported_write_flags); + mirror_top_bs->supported_zero_flags = BDRV_REQ_WRITE_UNCHANGED | + ((BDRV_REQ_FUA | BDRV_REQ_MAY_UNMAP) + & bs->supported_zero_flags); + bs_opaque = g_new0(MirrorBDSOpaque, 1); mirror_top_bs->opaque = bs_opaque; bdrv_set_aio_context(mirror_top_bs, bdrv_get_aio_context(bs));