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read_record() could be used by primary to read dirty bitmap record sent by secondary under COLO. When used by xc save side, we need to pass the backchannel fd instead of ctx->fd to read_record(), so we added a fd param to it. No functional changes. CC: Andrew Cooper <andrew.cooper3@citrix.com> Signed-off-by: Yang Hongyang <hongyang.yang@easystack.cn> Signed-off-by: Wen Congyang <wency@cn.fujitsu.com> Signed-off-by: Changlong Xie <xiecl.fnst@cn.fujitsu.com> Acked-by: Ian Jackson <ian.jackson@eu.citrix.com>