document-haness/docs/virtualization/final/assets/diagrams/write-completion-boundaries/write-completion-boundaries.drawio

<?xml version="1.0" encoding="UTF-8"?>
<mxfile host="app.diagrams.net" modified="2026-07-23T00:00:00.000Z" agent="techviz-harness" version="24.7.17" type="device">
  <diagram id="write-completion-boundaries" name="fsync() 의 요구가 물리 storage 까지 내려가는 사슬">
    <mxGraphModel dx="680" dy="2127" grid="1" gridSize="10" guides="1" tooltips="1" connect="1" arrows="1" fold="1" page="1" pageScale="1" pageWidth="827" pageHeight="2127" math="0" shadow="0">
      <root>
        <mxCell id="0"/>
        <mxCell id="1" parent="0"/>
        <mxCell id="n_postgresql" value="PostgreSQL&lt;br/&gt;write()&lt;br/&gt;fsync()" tooltip="필요한 시점에 fsync() 를 불러 영속성 경계까지 반영을 요청하는 게스트 프로세스. | Evidence: L6755-L6755, L6739-L6747" style="whiteSpace=wrap;html=1;rounded=1;strokeWidth=2;fontSize=14;fontStyle=1;fillColor=#ffffff;strokeColor=#2d4357;verticalAlign=middle;" vertex="1" parent="1">
          <mxGeometry x="35.0" y="145.0" width="150.0" height="88.0" as="geometry"/>
        </mxCell>
        <mxCell id="n_guest-filesystem" value="Guest Filesystem" tooltip="fsync() 요구를 처음 받는 게스트 파일시스템. | Evidence: L6759-L6759" style="whiteSpace=wrap;html=1;rounded=1;strokeWidth=2;fontSize=14;fontStyle=1;fillColor=#ffffff;strokeColor=#2d4357;verticalAlign=middle;" vertex="1" parent="1">
          <mxGeometry x="47.0" y="455.0" width="150.0" height="64.0" as="geometry"/>
        </mxCell>
        <mxCell id="n_guest-block-layer" value="Guest Block Layer" tooltip="요구를 FLUSH 등의 block 요청으로 바꾸는 계층. | Evidence: L6762-L6764" style="whiteSpace=wrap;html=1;rounded=1;strokeWidth=2;fontSize=14;fontStyle=1;fillColor=#ffffff;strokeColor=#2d4357;verticalAlign=middle;" vertex="1" parent="1">
          <mxGeometry x="47.0" y="765.0" width="153.0" height="64.0" as="geometry"/>
        </mxCell>
        <mxCell id="n_virtio-blk" value="virtio-blk" tooltip="그 요청을 VM 경계 너머로 옮기는 게스트 driver. | Evidence: L6766-L6766" style="whiteSpace=wrap;html=1;rounded=1;strokeWidth=2;fontSize=14;fontStyle=1;fillColor=#ffffff;strokeColor=#2d4357;verticalAlign=middle;" vertex="1" parent="1">
          <mxGeometry x="47.0" y="1078.0" width="150.0" height="64.0" as="geometry"/>
        </mxCell>
        <mxCell id="n_qemu-backend" value="QEMU / Backend" tooltip="요청을 받아 호스트 쪽 파일 I/O 나 block I/O 로 잇는 자리. | Evidence: L6769-L6769, L6699-L6699" style="whiteSpace=wrap;html=1;rounded=1;strokeWidth=2;fontSize=14;fontStyle=1;fillColor=#ffffff;strokeColor=#2d4357;verticalAlign=middle;" vertex="1" parent="1">
          <mxGeometry x="47.0" y="1388.0" width="150.0" height="64.0" as="geometry"/>
        </mxCell>
        <mxCell id="n_host-storage-stack" value="Host Storage Stack" tooltip="호스트 Page Cache 와 파일시스템, Block Layer 가 놓인 구간. | Evidence: L6772-L6772, L6701-L6705" style="whiteSpace=wrap;html=1;rounded=1;strokeWidth=2;fontSize=14;fontStyle=1;fillColor=#ffffff;strokeColor=#2d4357;verticalAlign=middle;" vertex="1" parent="1">
          <mxGeometry x="47.0" y="1698.0" width="160.0" height="64.0" as="geometry"/>
        </mxCell>
        <mxCell id="n_physical-storage" value="Physical Storage" tooltip="요구가 여기까지 전달되어야 정전 이후 생존을 말할 수 있다. | Evidence: L6775-L6778, L6742-L6742" style="whiteSpace=wrap;html=1;rounded=1;strokeWidth=2;fontSize=14;fontStyle=1;fillColor=#ffffff;strokeColor=#2d4357;verticalAlign=middle;strokeColor=#2563eb;strokeWidth=2;" vertex="1" parent="1">
          <mxGeometry x="47.0" y="2018.0" width="150.0" height="64.0" as="geometry"/>
        </mxCell>
        <mxCell id="e_app-to-guest-fs" value="fsync()" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;strokeWidth=2;endArrow=block;endFill=1;" edge="1" parent="1" source="n_postgresql" target="n_guest-filesystem">
          <mxGeometry relative="1" as="geometry">
            <mxPoint x="116.0" y="316.0" as="offset"/>
          </mxGeometry>
        </mxCell>
        <mxCell id="e_guest-fs-to-block-layer" value="" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;strokeWidth=2;endArrow=block;endFill=1;" edge="1" parent="1" source="n_guest-filesystem" target="n_guest-block-layer">
          <mxGeometry relative="1" as="geometry">
            <mxPoint x="122.8" y="614.0" as="offset"/>
          </mxGeometry>
        </mxCell>
        <mxCell id="e_block-layer-to-virtio" value="FLUSH 등" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;strokeWidth=2;endArrow=block;endFill=1;" edge="1" parent="1" source="n_guest-block-layer" target="n_virtio-blk">
          <mxGeometry relative="1" as="geometry">
            <mxPoint x="122.8" y="925.5" as="offset"/>
          </mxGeometry>
        </mxCell>
        <mxCell id="e_virtio-to-qemu" value="" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;strokeWidth=2;endArrow=block;endFill=1;" edge="1" parent="1" source="n_virtio-blk" target="n_qemu-backend">
          <mxGeometry relative="1" as="geometry">
            <mxPoint x="146.0" y="1265.0" as="offset"/>
          </mxGeometry>
        </mxCell>
        <mxCell id="e_qemu-to-host-stack" value="" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;strokeWidth=2;endArrow=block;endFill=1;" edge="1" parent="1" source="n_qemu-backend" target="n_host-storage-stack">
          <mxGeometry relative="1" as="geometry">
            <mxPoint x="124.5" y="1547.0" as="offset"/>
          </mxGeometry>
        </mxCell>
        <mxCell id="e_host-stack-to-physical" value="" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;strokeWidth=2;endArrow=block;endFill=1;" edge="1" parent="1" source="n_host-storage-stack" target="n_physical-storage">
          <mxGeometry relative="1" as="geometry">
            <mxPoint x="124.5" y="1862.0" as="offset"/>
          </mxGeometry>
        </mxCell>
      </root>
    </mxGraphModel>
  </diagram>
</mxfile>