From 483eb2f56657e8e7f419ab1a4fab8dce9ade8609 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sat, 27 Apr 2024 20:24:20 +0200
Subject: Adding upstream version 14.2.21.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 src/spdk/doc/img/iscsi.svg                        | 827 ++++++++++++++++++++++
 src/spdk/doc/img/iscsi_example.svg                | 540 ++++++++++++++
 src/spdk/doc/img/lvol_clone_snapshot_read.svg     |   3 +
 src/spdk/doc/img/lvol_clone_snapshot_write.svg    |   3 +
 src/spdk/doc/img/lvol_inflate_clone_snapshot.svg  |   3 +
 src/spdk/doc/img/lvol_thin_provisioning.svg       |   3 +
 src/spdk/doc/img/lvol_thin_provisioning_write.svg |   3 +
 src/spdk/doc/img/qemu_vhost_data_flow.svg         |   2 +
 8 files changed, 1384 insertions(+)
 create mode 100644 src/spdk/doc/img/iscsi.svg
 create mode 100644 src/spdk/doc/img/iscsi_example.svg
 create mode 100644 src/spdk/doc/img/lvol_clone_snapshot_read.svg
 create mode 100644 src/spdk/doc/img/lvol_clone_snapshot_write.svg
 create mode 100644 src/spdk/doc/img/lvol_inflate_clone_snapshot.svg
 create mode 100644 src/spdk/doc/img/lvol_thin_provisioning.svg
 create mode 100644 src/spdk/doc/img/lvol_thin_provisioning_write.svg
 create mode 100644 src/spdk/doc/img/qemu_vhost_data_flow.svg

(limited to 'src/spdk/doc/img')

diff --git a/src/spdk/doc/img/iscsi.svg b/src/spdk/doc/img/iscsi.svg
new file mode 100644
index 00000000..2ba4b963
--- /dev/null
+++ b/src/spdk/doc/img/iscsi.svg
@@ -0,0 +1,827 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   width="174.625mm"
+   height="82.020836mm"
+   version="1.1"
+   viewBox="0 0 174.625 82.020833"
+   id="svg136"
+   sodipodi:docname="iscsi.svg"
+   inkscape:version="0.92.3 (2405546, 2018-03-11)">
+  <sodipodi:namedview
+     pagecolor="#ffffff"
+     bordercolor="#666666"
+     borderopacity="1"
+     objecttolerance="10"
+     gridtolerance="10"
+     guidetolerance="10"
+     inkscape:pageopacity="0"
+     inkscape:pageshadow="2"
+     inkscape:window-width="1387"
+     inkscape:window-height="888"
+     id="namedview138"
+     showgrid="true"
+     inkscape:zoom="0.9096286"
+     inkscape:cx="242.15534"
+     inkscape:cy="182.31015"
+     inkscape:window-x="1974"
+     inkscape:window-y="112"
+     inkscape:window-maximized="0"
+     inkscape:current-layer="svg136"
+     fit-margin-top="0"
+     fit-margin-left="0"
+     fit-margin-right="0"
+     fit-margin-bottom="0">
+    <inkscape:grid
+       type="xygrid"
+       id="grid2224"
+       originx="38.364584"
+       originy="-17.197913" />
+  </sodipodi:namedview>
+  <title
+     id="title2">Thin Provisioning Write</title>
+  <defs
+     id="defs22">
+    <marker
+       inkscape:stockid="Arrow1Mstart"
+       orient="auto"
+       refY="0"
+       refX="0"
+       id="marker5538"
+       style="overflow:visible"
+       inkscape:isstock="true">
+      <path
+         id="path5536"
+         d="M 0,0 5,-5 -12.5,0 5,5 Z"
+         style="fill:#0000ff;fill-opacity:1;fill-rule:evenodd;stroke:#0000ff;stroke-width:1.00000003pt;stroke-opacity:1"
+         transform="matrix(0.4,0,0,0.4,4,0)"
+         inkscape:connector-curvature="0" />
+    </marker>
+    <marker
+       inkscape:isstock="true"
+       style="overflow:visible"
+       id="marker5348"
+       refX="0"
+       refY="0"
+       orient="auto"
+       inkscape:stockid="Arrow1Mstart"
+       inkscape:collect="always">
+      <path
+         inkscape:connector-curvature="0"
+         transform="matrix(0.4,0,0,0.4,4,0)"
+         style="fill:#0000ff;fill-opacity:1;fill-rule:evenodd;stroke:#0000ff;stroke-width:1.00000003pt;stroke-opacity:1"
+         d="M 0,0 5,-5 -12.5,0 5,5 Z"
+         id="path5346" />
+    </marker>
+    <marker
+       inkscape:stockid="Arrow1Mstart"
+       orient="auto"
+       refY="0"
+       refX="0"
+       id="marker5152"
+       style="overflow:visible"
+       inkscape:isstock="true"
+       inkscape:collect="always">
+      <path
+         id="path5150"
+         d="M 0,0 5,-5 -12.5,0 5,5 Z"
+         style="fill:#0000ff;fill-opacity:1;fill-rule:evenodd;stroke:#0000ff;stroke-width:1.00000003pt;stroke-opacity:1"
+         transform="matrix(0.4,0,0,0.4,4,0)"
+         inkscape:connector-curvature="0" />
+    </marker>
+    <marker
+       inkscape:isstock="true"
+       style="overflow:visible"
+       id="marker4974"
+       refX="0"
+       refY="0"
+       orient="auto"
+       inkscape:stockid="Arrow1Mstart"
+       inkscape:collect="always">
+      <path
+         inkscape:connector-curvature="0"
+         transform="matrix(0.4,0,0,0.4,4,0)"
+         style="fill:#0000ff;fill-opacity:1;fill-rule:evenodd;stroke:#0000ff;stroke-width:1.00000003pt;stroke-opacity:1"
+         d="M 0,0 5,-5 -12.5,0 5,5 Z"
+         id="path4972" />
+    </marker>
+    <marker
+       inkscape:stockid="Arrow1Mstart"
+       orient="auto"
+       refY="0"
+       refX="0"
+       id="marker4802"
+       style="overflow:visible"
+       inkscape:isstock="true"
+       inkscape:collect="always">
+      <path
+         id="path4800"
+         d="M 0,0 5,-5 -12.5,0 5,5 Z"
+         style="fill:#0000ff;fill-opacity:1;fill-rule:evenodd;stroke:#0000ff;stroke-width:1.00000003pt;stroke-opacity:1"
+         transform="matrix(0.4,0,0,0.4,4,0)"
+         inkscape:connector-curvature="0" />
+    </marker>
+    <marker
+       inkscape:isstock="true"
+       style="overflow:visible"
+       id="marker4636"
+       refX="0"
+       refY="0"
+       orient="auto"
+       inkscape:stockid="Arrow1Mstart"
+       inkscape:collect="always">
+      <path
+         inkscape:connector-curvature="0"
+         transform="matrix(0.4,0,0,0.4,4,0)"
+         style="fill:#0000ff;fill-opacity:1;fill-rule:evenodd;stroke:#0000ff;stroke-width:1.00000003pt;stroke-opacity:1"
+         d="M 0,0 5,-5 -12.5,0 5,5 Z"
+         id="path4634" />
+    </marker>
+    <marker
+       inkscape:isstock="true"
+       style="overflow:visible"
+       id="marker4476"
+       refX="0"
+       refY="0"
+       orient="auto"
+       inkscape:stockid="Arrow1Mstart">
+      <path
+         inkscape:connector-curvature="0"
+         transform="matrix(0.4,0,0,0.4,4,0)"
+         style="fill:#0000ff;fill-opacity:1;fill-rule:evenodd;stroke:#0000ff;stroke-width:1.00000003pt;stroke-opacity:1"
+         d="M 0,0 5,-5 -12.5,0 5,5 Z"
+         id="path4474" />
+    </marker>
+    <marker
+       inkscape:stockid="Arrow1Mend"
+       orient="auto"
+       refY="0"
+       refX="0"
+       id="marker2468"
+       style="overflow:visible"
+       inkscape:isstock="true">
+      <path
+         id="path2466"
+         d="M 0,0 5,-5 -12.5,0 5,5 Z"
+         style="fill:#ff0000;fill-opacity:1;fill-rule:evenodd;stroke:#ff2a2a;stroke-width:1.00000003pt;stroke-opacity:1"
+         transform="matrix(-0.4,0,0,-0.4,-4,0)"
+         inkscape:connector-curvature="0" />
+    </marker>
+    <marker
+       inkscape:stockid="Arrow1Mstart"
+       orient="auto"
+       refY="0"
+       refX="0"
+       id="marker2464"
+       style="overflow:visible"
+       inkscape:isstock="true"
+       inkscape:collect="always">
+      <path
+         id="path2462"
+         d="M 0,0 5,-5 -12.5,0 5,5 Z"
+         style="fill:#ff0000;fill-opacity:1;fill-rule:evenodd;stroke:#ff2a2a;stroke-width:1.00000003pt;stroke-opacity:1"
+         transform="matrix(0.4,0,0,0.4,4,0)"
+         inkscape:connector-curvature="0" />
+    </marker>
+    <marker
+       inkscape:stockid="Arrow1Mstart"
+       orient="auto"
+       refY="0"
+       refX="0"
+       id="Arrow1Mstart"
+       style="overflow:visible"
+       inkscape:isstock="true">
+      <path
+         id="path2198"
+         d="M 0,0 5,-5 -12.5,0 5,5 Z"
+         style="fill:#ff0000;fill-opacity:1;fill-rule:evenodd;stroke:#ff2a2a;stroke-width:1.00000003pt;stroke-opacity:1"
+         transform="matrix(0.4,0,0,0.4,4,0)"
+         inkscape:connector-curvature="0" />
+    </marker>
+    <marker
+       inkscape:stockid="Arrow1Mend"
+       orient="auto"
+       refY="0"
+       refX="0"
+       id="Arrow1Mend"
+       style="overflow:visible"
+       inkscape:isstock="true">
+      <path
+         id="path2201"
+         d="M 0,0 5,-5 -12.5,0 5,5 Z"
+         style="fill:#ff0000;fill-opacity:1;fill-rule:evenodd;stroke:#ff2a2a;stroke-width:1.00000003pt;stroke-opacity:1"
+         transform="matrix(-0.4,0,0,-0.4,-4,0)"
+         inkscape:connector-curvature="0" />
+    </marker>
+    <marker
+       inkscape:isstock="true"
+       style="overflow:visible"
+       id="marker1826-2-4-7-1-7"
+       refX="0"
+       refY="0"
+       orient="auto"
+       inkscape:stockid="Arrow1Mend">
+      <path
+         inkscape:connector-curvature="0"
+         transform="matrix(-0.4,0,0,-0.4,-4,0)"
+         style="fill:#0000ff;fill-opacity:1;fill-rule:evenodd;stroke:#0000ff;stroke-width:1.00000003pt;stroke-opacity:1"
+         d="M 0,0 5,-5 -12.5,0 5,5 Z"
+         id="path1824-9-4-2-5-2" />
+    </marker>
+    <marker
+       inkscape:isstock="true"
+       style="overflow:visible"
+       id="marker1826-2-4-7-1-7-5"
+       refX="0"
+       refY="0"
+       orient="auto"
+       inkscape:stockid="Arrow1Mend">
+      <path
+         inkscape:connector-curvature="0"
+         transform="matrix(-0.4,0,0,-0.4,-4,0)"
+         style="fill:#0000ff;fill-opacity:1;fill-rule:evenodd;stroke:#0000ff;stroke-width:1.00000003pt;stroke-opacity:1"
+         d="M 0,0 5,-5 -12.5,0 5,5 Z"
+         id="path1824-9-4-2-5-2-9" />
+    </marker>
+    <marker
+       inkscape:isstock="true"
+       style="overflow:visible"
+       id="marker1826-2-4-7-1-7-9"
+       refX="0"
+       refY="0"
+       orient="auto"
+       inkscape:stockid="Arrow1Mend">
+      <path
+         inkscape:connector-curvature="0"
+         transform="matrix(-0.4,0,0,-0.4,-4,0)"
+         style="fill:#0000ff;fill-opacity:1;fill-rule:evenodd;stroke:#0000ff;stroke-width:1.00000003pt;stroke-opacity:1"
+         d="M 0,0 5,-5 -12.5,0 5,5 Z"
+         id="path1824-9-4-2-5-2-6" />
+    </marker>
+    <marker
+       inkscape:isstock="true"
+       style="overflow:visible"
+       id="marker1826-2-4-7-1-7-5-2"
+       refX="0"
+       refY="0"
+       orient="auto"
+       inkscape:stockid="Arrow1Mend">
+      <path
+         inkscape:connector-curvature="0"
+         transform="matrix(-0.4,0,0,-0.4,-4,0)"
+         style="fill:#0000ff;fill-opacity:1;fill-rule:evenodd;stroke:#0000ff;stroke-width:1.00000003pt;stroke-opacity:1"
+         d="M 0,0 5,-5 -12.5,0 5,5 Z"
+         id="path1824-9-4-2-5-2-9-3" />
+    </marker>
+    <marker
+       inkscape:isstock="true"
+       style="overflow:visible"
+       id="marker1826-2-4-7-1-7-9-4"
+       refX="0"
+       refY="0"
+       orient="auto"
+       inkscape:stockid="Arrow1Mend">
+      <path
+         inkscape:connector-curvature="0"
+         transform="matrix(-0.4,0,0,-0.4,-4,0)"
+         style="fill:#0000ff;fill-opacity:1;fill-rule:evenodd;stroke:#0000ff;stroke-width:1.00000003pt;stroke-opacity:1"
+         d="M 0,0 5,-5 -12.5,0 5,5 Z"
+         id="path1824-9-4-2-5-2-6-9" />
+    </marker>
+    <marker
+       inkscape:isstock="true"
+       style="overflow:visible"
+       id="marker1826-2-4-7-1-7-5-27"
+       refX="0"
+       refY="0"
+       orient="auto"
+       inkscape:stockid="Arrow1Mend">
+      <path
+         inkscape:connector-curvature="0"
+         transform="matrix(-0.4,0,0,-0.4,-4,0)"
+         style="fill:#0000ff;fill-opacity:1;fill-rule:evenodd;stroke:#0000ff;stroke-width:1.00000003pt;stroke-opacity:1"
+         d="M 0,0 5,-5 -12.5,0 5,5 Z"
+         id="path1824-9-4-2-5-2-9-4" />
+    </marker>
+    <marker
+       inkscape:isstock="true"
+       style="overflow:visible"
+       id="marker1826-2-4-7-1-7-5-27-9"
+       refX="0"
+       refY="0"
+       orient="auto"
+       inkscape:stockid="Arrow1Mend">
+      <path
+         inkscape:connector-curvature="0"
+         transform="matrix(-0.4,0,0,-0.4,-4,0)"
+         style="fill:#0000ff;fill-opacity:1;fill-rule:evenodd;stroke:#0000ff;stroke-width:1.00000003pt;stroke-opacity:1"
+         d="M 0,0 5,-5 -12.5,0 5,5 Z"
+         id="path1824-9-4-2-5-2-9-4-4" />
+    </marker>
+    <marker
+       inkscape:stockid="Arrow1Mstart"
+       orient="auto"
+       refY="0"
+       refX="0"
+       id="marker2683-6"
+       style="overflow:visible"
+       inkscape:isstock="true">
+      <path
+         id="path2681-3"
+         d="M 0,0 5,-5 -12.5,0 5,5 Z"
+         style="fill:#000000;fill-opacity:1;fill-rule:evenodd;stroke:#000000;stroke-width:1.00000003pt;stroke-opacity:1"
+         transform="matrix(0.4,0,0,0.4,4,0)"
+         inkscape:connector-curvature="0" />
+    </marker>
+    <marker
+       inkscape:stockid="Arrow1Mend"
+       orient="auto"
+       refY="0"
+       refX="0"
+       id="marker2679-9"
+       style="overflow:visible"
+       inkscape:isstock="true">
+      <path
+         id="path2677-8"
+         d="M 0,0 5,-5 -12.5,0 5,5 Z"
+         style="fill:#000000;fill-opacity:1;fill-rule:evenodd;stroke:#000000;stroke-width:1.00000003pt;stroke-opacity:1"
+         transform="matrix(-0.4,0,0,-0.4,-4,0)"
+         inkscape:connector-curvature="0" />
+    </marker>
+  </defs>
+  <metadata
+     id="metadata24">
+    <rdf:RDF>
+      <cc:Work
+         rdf:about="">
+        <dc:format>image/svg+xml</dc:format>
+        <dc:type
+           rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
+        <dc:title>Thin Provisioning Write</dc:title>
+      </cc:Work>
+    </rdf:RDF>
+  </metadata>
+  <rect
+     style="fill:#ffffff;fill-opacity:1;stroke:none;stroke-width:0.26458332;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1"
+     id="rect7030"
+     width="174.625"
+     height="82.020836"
+     x="0"
+     y="1.4210855e-014"
+     ry="0" />
+  <rect
+     style="fill:none;fill-opacity:1;stroke:#999999;stroke-width:0.5;stroke-opacity:1"
+     id="rect132-6"
+     ry="1.3229001"
+     height="50.270832"
+     width="75.406242"
+     y="-91.281242"
+     x="2.6458344"
+     transform="rotate(90)" />
+  <rect
+     x="50.270416"
+     y="19.84375"
+     width="22.49"
+     height="6.6146002"
+     id="rect104"
+     style="fill:#fff6d5;fill-opacity:1;stroke:#000000;stroke-width:0.26458001" />
+  <rect
+     style="fill:none;stroke:#999999;stroke-width:0.26458332;stroke-miterlimit:4;stroke-dasharray:none"
+     id="rect132"
+     ry="1.3229001"
+     height="30.427082"
+     width="33.072914"
+     y="-76.729164"
+     x="11.906253"
+     transform="rotate(90)" />
+  <text
+     x="56.69899"
+     y="24.392132"
+     font-size="3.5278px"
+     style="font-size:3.52780008px;line-height:1.25;font-family:sans-serif;font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;letter-spacing:0px;word-spacing:0px;fill:#000000;stroke-width:0.26458001"
+     xml:space="preserve"
+     id="text90">LUN0</text>
+  <rect
+     style="fill:none;fill-opacity:1;stroke:#999999;stroke-width:0.5;stroke-opacity:1"
+     id="rect132-6-8"
+     ry="1.3229001"
+     height="33.072914"
+     width="64.822906"
+     y="-35.718758"
+     x="10.583331"
+     transform="rotate(90)" />
+  <path
+     sodipodi:nodetypes="cc"
+     inkscape:connector-curvature="0"
+     id="path1192-8-7-7-4-2"
+     d="m 30.427087,23.812498 19.843748,3e-6"
+     style="fill:#0000ff;stroke:#0000ff;stroke-width:0.26511249;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1;marker-start:url(#marker4476);marker-end:url(#marker1826-2-4-7-1-7)" />
+  <path
+     sodipodi:nodetypes="cc"
+     inkscape:connector-curvature="0"
+     id="path11761-9-7"
+     d="m 105.83333,33.072917 38.36458,2e-6"
+     style="fill:#ff0000;stroke:#ff2a2a;stroke-width:0.26499999;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1;marker-start:url(#marker2464);marker-end:url(#marker2468)" />
+  <rect
+     x="50.270416"
+     y="27.781233"
+     width="22.49"
+     height="6.6146002"
+     id="rect104-6"
+     style="fill:#fff6d5;fill-opacity:1;stroke:#000000;stroke-width:0.26458001" />
+  <rect
+     x="50.270836"
+     y="35.718746"
+     width="22.49"
+     height="6.6146002"
+     id="rect104-5"
+     style="fill:#fff6d5;fill-opacity:1;stroke:#000000;stroke-width:0.26458001" />
+  <text
+     x="49.004951"
+     y="16.552654"
+     font-size="3.5278px"
+     style="font-size:3.52780008px;line-height:1.25;font-family:sans-serif;font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;letter-spacing:0px;word-spacing:0px;fill:#000000;stroke-width:0.26458001"
+     xml:space="preserve"
+     id="text90-5">Target1</text>
+  <text
+     x="56.810654"
+     y="32.229481"
+     font-size="3.5278px"
+     style="font-size:3.52780008px;line-height:1.25;font-family:sans-serif;font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;letter-spacing:0px;word-spacing:0px;fill:#000000;stroke-width:0.26458001"
+     xml:space="preserve"
+     id="text90-59">LUN1</text>
+  <text
+     x="56.853249"
+     y="40.350986"
+     font-size="3.5278px"
+     style="font-size:3.52780008px;line-height:1.25;font-family:sans-serif;font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;letter-spacing:0px;word-spacing:0px;fill:#000000;stroke-width:0.26458001"
+     xml:space="preserve"
+     id="text90-0">LUN2</text>
+  <text
+     x="43.28257"
+     y="6.9284844"
+     font-size="3.5278px"
+     style="font-size:3.52780008px;line-height:1.25;font-family:sans-serif;font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;letter-spacing:0px;word-spacing:0px;fill:#000000;stroke-width:0.26458001"
+     xml:space="preserve"
+     id="text90-5-5">iSCSI Target server</text>
+  <rect
+     x="50.270416"
+     y="55.562496"
+     width="22.49"
+     height="6.6146002"
+     id="rect104-0"
+     style="fill:#fff6d5;fill-opacity:1;stroke:#000000;stroke-width:0.26458001" />
+  <rect
+     style="fill:none;stroke:#999999;stroke-width:0.26458332;stroke-miterlimit:4;stroke-dasharray:none"
+     id="rect132-3"
+     ry="1.3229001"
+     height="30.427078"
+     width="25.135414"
+     y="-76.729164"
+     x="47.624996"
+     transform="rotate(90)" />
+  <text
+     x="56.69899"
+     y="60.110878"
+     font-size="3.5278px"
+     style="font-size:3.52780008px;line-height:1.25;font-family:sans-serif;font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;letter-spacing:0px;word-spacing:0px;fill:#000000;stroke-width:0.26458001"
+     xml:space="preserve"
+     id="text90-05">LUN0</text>
+  <rect
+     x="50.270416"
+     y="63.499977"
+     width="22.49"
+     height="6.6146002"
+     id="rect104-6-8"
+     style="fill:#fff6d5;fill-opacity:1;stroke:#000000;stroke-width:0.26458001" />
+  <text
+     x="49.004944"
+     y="52.2714"
+     font-size="3.5278px"
+     style="font-size:3.52780008px;line-height:1.25;font-family:sans-serif;font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;letter-spacing:0px;word-spacing:0px;fill:#000000;stroke-width:0.26458001"
+     xml:space="preserve"
+     id="text90-5-2">Target2</text>
+  <text
+     x="56.810646"
+     y="67.948235"
+     font-size="3.5278px"
+     style="font-size:3.52780008px;line-height:1.25;font-family:sans-serif;font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;letter-spacing:0px;word-spacing:0px;fill:#000000;stroke-width:0.26458001"
+     xml:space="preserve"
+     id="text90-59-4">LUN1</text>
+  <rect
+     x="7.937088"
+     y="19.84375"
+     width="22.49"
+     height="6.6146002"
+     id="rect104-64"
+     style="fill:#fff6d5;fill-opacity:1;stroke:#000000;stroke-width:0.26458001" />
+  <text
+     x="14.365662"
+     y="24.392132"
+     font-size="3.5278px"
+     style="font-size:3.52780008px;line-height:1.25;font-family:sans-serif;font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;letter-spacing:0px;word-spacing:0px;fill:#000000;stroke-width:0.26458001"
+     xml:space="preserve"
+     id="text90-56">bdev0</text>
+  <rect
+     x="7.937088"
+     y="27.781233"
+     width="22.49"
+     height="6.6146002"
+     id="rect104-6-9"
+     style="fill:#fff6d5;fill-opacity:1;stroke:#000000;stroke-width:0.26458001" />
+  <rect
+     x="7.9375038"
+     y="35.718746"
+     width="22.49"
+     height="6.6146002"
+     id="rect104-5-4"
+     style="fill:#fff6d5;fill-opacity:1;stroke:#000000;stroke-width:0.26458001" />
+  <text
+     x="14.477322"
+     y="32.229481"
+     font-size="3.5278px"
+     style="font-size:3.52780008px;line-height:1.25;font-family:sans-serif;font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;letter-spacing:0px;word-spacing:0px;fill:#000000;stroke-width:0.26458001"
+     xml:space="preserve"
+     id="text90-59-2">bdev1</text>
+  <text
+     x="14.51992"
+     y="40.350986"
+     font-size="3.5278px"
+     style="font-size:3.52780008px;line-height:1.25;font-family:sans-serif;font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;letter-spacing:0px;word-spacing:0px;fill:#000000;stroke-width:0.26458001"
+     xml:space="preserve"
+     id="text90-0-5">bdev2</text>
+  <rect
+     x="7.937088"
+     y="55.562496"
+     width="22.49"
+     height="6.6146002"
+     id="rect104-0-8"
+     style="fill:#fff6d5;fill-opacity:1;stroke:#000000;stroke-width:0.26458001" />
+  <text
+     x="14.365662"
+     y="60.110878"
+     font-size="3.5278px"
+     style="font-size:3.52780008px;line-height:1.25;font-family:sans-serif;font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;letter-spacing:0px;word-spacing:0px;fill:#000000;stroke-width:0.26458001"
+     xml:space="preserve"
+     id="text90-05-7">bdev3</text>
+  <rect
+     x="7.937088"
+     y="63.499977"
+     width="22.49"
+     height="6.6146002"
+     id="rect104-6-8-2"
+     style="fill:#fff6d5;fill-opacity:1;stroke:#000000;stroke-width:0.26458001" />
+  <text
+     x="14.477322"
+     y="67.948235"
+     font-size="3.5278px"
+     style="font-size:3.52780008px;line-height:1.25;font-family:sans-serif;font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;letter-spacing:0px;word-spacing:0px;fill:#000000;stroke-width:0.26458001"
+     xml:space="preserve"
+     id="text90-59-4-0">bdev4</text>
+  <path
+     sodipodi:nodetypes="cc"
+     inkscape:connector-curvature="0"
+     id="path1192-8-7-7-4-2-6"
+     d="m 30.427087,31.749998 19.843748,3e-6"
+     style="fill:#0000ff;stroke:#0000ff;stroke-width:0.26499999;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1;marker-start:url(#marker4636);marker-end:url(#marker1826-2-4-7-1-7-5)" />
+  <path
+     sodipodi:nodetypes="cc"
+     inkscape:connector-curvature="0"
+     id="path1192-8-7-7-4-2-4"
+     d="m 30.427087,39.687498 19.843748,2e-6"
+     style="fill:#0000ff;stroke:#0000ff;stroke-width:0.26499999;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1;marker-start:url(#marker4802);marker-end:url(#marker1826-2-4-7-1-7-9)" />
+  <path
+     sodipodi:nodetypes="cc"
+     inkscape:connector-curvature="0"
+     id="path1192-8-7-7-4-2-6-5"
+     d="m 30.427087,59.531248 19.843748,2e-6"
+     style="fill:#0000ff;stroke:#0000ff;stroke-width:0.26499999;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1;marker-start:url(#marker4974);marker-end:url(#marker1826-2-4-7-1-7-5-2)" />
+  <path
+     sodipodi:nodetypes="cc"
+     inkscape:connector-curvature="0"
+     id="path1192-8-7-7-4-2-4-5"
+     d="m 30.427087,67.468748 19.843748,10e-7"
+     style="fill:#0000ff;stroke:#0000ff;stroke-width:0.26499999;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1;marker-start:url(#marker5152);marker-end:url(#marker1826-2-4-7-1-7-9-4)" />
+  <rect
+     x="83.343323"
+     y="29.104166"
+     width="22.49"
+     height="6.6146002"
+     id="rect104-63"
+     style="fill:#fff6d5;fill-opacity:1;stroke:#000000;stroke-width:0.26458001" />
+  <text
+     x="84.467346"
+     y="33.405464"
+     font-size="3.5278px"
+     style="font-size:3.52780008px;line-height:1.25;font-family:sans-serif;font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;letter-spacing:0px;word-spacing:0px;fill:#000000;stroke-width:0.26458001"
+     xml:space="preserve"
+     id="text90-1">portal grp 0</text>
+  <rect
+     x="83.343323"
+     y="54.239578"
+     width="22.49"
+     height="6.6146002"
+     id="rect104-63-1"
+     style="fill:#fff6d5;fill-opacity:1;stroke:#000000;stroke-width:0.26458001" />
+  <text
+     x="84.673019"
+     y="58.540874"
+     font-size="3.5278px"
+     style="font-size:3.52780008px;line-height:1.25;font-family:sans-serif;font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;letter-spacing:0px;word-spacing:0px;fill:#000000;stroke-width:0.26458001"
+     xml:space="preserve"
+     id="text90-1-7">portal grp 1</text>
+  <text
+     x="4.7052402"
+     y="14.717848"
+     font-size="3.5278px"
+     style="font-size:3.52780008px;line-height:1.25;font-family:sans-serif;font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;letter-spacing:0px;word-spacing:0px;fill:#000000;stroke-width:0.26458001"
+     xml:space="preserve"
+     id="text90-5-5-8">SPDK bdevs</text>
+  <path
+     sodipodi:nodetypes="cc"
+     inkscape:connector-curvature="0"
+     id="path1192-8-7-7-4-2-6-4"
+     d="m 76.729167,33.072917 h 6.614587"
+     style="fill:#0000ff;stroke:#0000ff;stroke-width:0.26499999;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1;marker-start:url(#marker5348);marker-end:url(#marker1826-2-4-7-1-7-5-27)" />
+  <path
+     sodipodi:nodetypes="cc"
+     inkscape:connector-curvature="0"
+     id="path1192-8-7-7-4-2-6-4-2"
+     d="m 76.729167,58.208333 h 6.614587"
+     style="fill:#0000ff;stroke:#0000ff;stroke-width:0.26499999;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1;marker-start:url(#marker5538);marker-end:url(#marker1826-2-4-7-1-7-5-27-9)" />
+  <rect
+     x="144.19748"
+     y="29.104151"
+     width="22.49"
+     height="6.6146002"
+     id="rect104-63-9"
+     style="fill:#fff6d5;fill-opacity:1;stroke:#000000;stroke-width:0.26458001" />
+  <text
+     x="147.16313"
+     y="33.713963"
+     font-size="3.5278px"
+     style="font-size:3.52780008px;line-height:1.25;font-family:sans-serif;font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;letter-spacing:0px;word-spacing:0px;fill:#000000;stroke-width:0.26458001"
+     xml:space="preserve"
+     id="text90-1-8">initiator 0</text>
+  <rect
+     x="144.19748"
+     y="54.239567"
+     width="22.49"
+     height="6.6146002"
+     id="rect104-63-1-5"
+     style="fill:#fff6d5;fill-opacity:1;stroke:#000000;stroke-width:0.26458001" />
+  <text
+     x="147.23584"
+     y="58.922092"
+     font-size="3.5278px"
+     style="font-size:3.52780008px;line-height:1.25;font-family:sans-serif;font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;letter-spacing:0px;word-spacing:0px;fill:#000000;stroke-width:0.26458001"
+     xml:space="preserve"
+     id="text90-1-7-0">initiator 1</text>
+  <path
+     sodipodi:nodetypes="cc"
+     inkscape:connector-curvature="0"
+     id="path11761-9-7-9"
+     d="m 105.83333,58.208333 38.36458,2e-6"
+     style="fill:#ff0000;stroke:#ff2a2a;stroke-width:0.26511249;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1;marker-start:url(#Arrow1Mstart);marker-end:url(#Arrow1Mend)" />
+  <rect
+     style="fill:none;stroke:#999999;stroke-width:0.5"
+     id="rect132-6-1"
+     ry="1.3229001"
+     height="33.072926"
+     width="38.364586"
+     y="-171.97916"
+     x="2.6458333"
+     transform="rotate(90)" />
+  <rect
+     style="fill:none;stroke:#999999;stroke-width:0.5"
+     id="rect132-6-1-3"
+     ry="1.3229001"
+     height="33.072914"
+     width="35.71875"
+     y="-171.97916"
+     x="43.65625"
+     transform="rotate(90)" />
+  <text
+     x="141.38495"
+     y="7.1341634"
+     font-size="3.5278px"
+     style="font-size:3.52780008px;line-height:1.25;font-family:sans-serif;font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;letter-spacing:0px;word-spacing:0px;fill:#000000;stroke-width:0.26458001"
+     xml:space="preserve"
+     id="text90-5-5-7">iSCSI client 0</text>
+  <text
+     x="141.15009"
+     y="48.275509"
+     font-size="3.5278px"
+     style="font-size:3.52780008px;line-height:1.25;font-family:sans-serif;font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;letter-spacing:0px;word-spacing:0px;fill:#000000;stroke-width:0.26458001"
+     xml:space="preserve"
+     id="text90-5-5-7-5">iSCSI client 1</text>
+  <path
+     style="display:inline;fill:none;stroke:#999999;stroke-width:0.26458332px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+     d="M 105.83333,87.312502 124.35416,1.3229172"
+     id="path2638"
+     inkscape:connector-curvature="0"
+     sodipodi:nodetypes="cc" />
+  <path
+     style="display:inline;fill:none;stroke:#999999;stroke-width:0.26458332px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+     d="M 107.15625,88.635419 125.67708,2.6458333"
+     id="path2640"
+     inkscape:connector-curvature="0"
+     sodipodi:nodetypes="cc" />
+  <text
+     x="105.28584"
+     y="13.99068"
+     font-size="3.5278px"
+     style="font-size:3.52780008px;line-height:1.25;font-family:sans-serif;font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;letter-spacing:0px;word-spacing:0px;display:inline;fill:#000000;stroke-width:0.26458001"
+     xml:space="preserve"
+     id="text90-5-5-9">TCP Network</text>
+  <path
+     style="display:inline;fill:none;stroke:#000000;stroke-width:0.52916664;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1;marker-start:url(#marker2683-6);marker-end:url(#marker2679-9)"
+     d="m 107.15625,17.197917 h 18.52083"
+     id="path2669"
+     inkscape:connector-curvature="0"
+     sodipodi:nodetypes="cc" />
+  <g
+     id="g4350-40"
+     transform="matrix(1,0,0,0.61904764,50.020836,28.004467)">
+    <ellipse
+       ry="2.6458333"
+       rx="6.614583"
+       cy="-11.045678"
+       cx="104.76043"
+       id="path4344-1"
+       style="fill:#afdde9;fill-opacity:1;stroke:#000000;stroke-width:0.52916664;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1" />
+    <path
+       sodipodi:nodetypes="ccccc"
+       inkscape:connector-curvature="0"
+       id="path4346-6"
+       d="m 98.145835,-11.045677 v 6.4110574 c 10e-6,3.968751 13.229165,3.968751 13.229165,0 v -6.4110574 c 0,4.2740384 -13.229155,3.9687504 -13.229165,0 z"
+       style="fill:#afdde9;fill-opacity:1;stroke:#000000;stroke-width:0.52916664;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1" />
+    <ellipse
+       ry="2.645833"
+       rx="6.6145835"
+       cy="-17.456738"
+       cx="104.76044"
+       id="path4344-1-7"
+       style="fill:#afdde9;fill-opacity:1;stroke:#000000;stroke-width:0.52916664;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1" />
+    <path
+       sodipodi:nodetypes="ccccc"
+       inkscape:connector-curvature="0"
+       id="path4346-6-3"
+       d="m 98.145841,-17.456734 v 6.411057 c 10e-6,3.968751 13.229159,3.968751 13.229159,0 v -6.411057 c 0,4.274038 -13.229149,3.96875 -13.229159,0 z"
+       style="fill:#afdde9;fill-opacity:1;stroke:#000000;stroke-width:0.52916664;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1" />
+    <ellipse
+       ry="2.645833"
+       rx="6.6145835"
+       cy="-23.867794"
+       cx="104.76044"
+       id="path4344-1-9"
+       style="fill:#afdde9;fill-opacity:1;stroke:#000000;stroke-width:0.52916664;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1" />
+    <path
+       sodipodi:nodetypes="ccccc"
+       inkscape:connector-curvature="0"
+       id="path4346-6-2"
+       d="m 98.145841,-23.867792 v 6.411058 c 10e-6,3.968751 13.229159,3.968751 13.229159,0 v -6.411058 c 0,4.274039 -13.229149,3.968751 -13.229159,0 z"
+       style="fill:#afdde9;fill-opacity:1;stroke:#000000;stroke-width:0.52916664;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1" />
+    <ellipse
+       ry="2.645833"
+       rx="6.6145835"
+       cy="72.298073"
+       cx="106.08334"
+       id="path4344-1-5"
+       style="fill:#afdde9;fill-opacity:1;stroke:#000000;stroke-width:0.52916664;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1" />
+    <ellipse
+       ry="2.645833"
+       rx="6.6145835"
+       cy="65.887009"
+       cx="106.08335"
+       id="path4344-1-7-3"
+       style="fill:#afdde9;fill-opacity:1;stroke:#000000;stroke-width:0.52916664;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1" />
+    <path
+       sodipodi:nodetypes="ccccc"
+       inkscape:connector-curvature="0"
+       id="path4346-6-3-4"
+       d="m 99.468754,65.887013 v 6.411057 c 10e-6,3.968751 13.229156,3.968751 13.229156,0 v -6.411057 c 0,4.274038 -13.229146,3.96875 -13.229156,0 z"
+       style="fill:#afdde9;fill-opacity:1;stroke:#000000;stroke-width:0.52916664;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1" />
+    <ellipse
+       ry="2.645833"
+       rx="6.6145835"
+       cy="59.475952"
+       cx="106.08335"
+       id="path4344-1-9-1"
+       style="fill:#afdde9;fill-opacity:1;stroke:#000000;stroke-width:0.52916664;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1" />
+    <path
+       sodipodi:nodetypes="ccccc"
+       inkscape:connector-curvature="0"
+       id="path4346-6-2-9"
+       d="m 99.468754,59.475955 v 6.411058 c 10e-6,3.968751 13.229156,3.968751 13.229156,0 v -6.411058 c 0,4.274039 -13.229146,3.968751 -13.229156,0 z"
+       style="fill:#afdde9;fill-opacity:1;stroke:#000000;stroke-width:0.52916664;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1" />
+  </g>
+</svg>
diff --git a/src/spdk/doc/img/iscsi_example.svg b/src/spdk/doc/img/iscsi_example.svg
new file mode 100644
index 00000000..b5f7ea09
--- /dev/null
+++ b/src/spdk/doc/img/iscsi_example.svg
@@ -0,0 +1,540 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   width="169.33331mm"
+   height="53.006062mm"
+   version="1.1"
+   viewBox="0 0 169.33331 53.00606"
+   id="svg136"
+   sodipodi:docname="iscsi_example.svg"
+   inkscape:version="0.92.3 (2405546, 2018-03-11)">
+  <sodipodi:namedview
+     pagecolor="#ffffff"
+     bordercolor="#666666"
+     borderopacity="1"
+     objecttolerance="10"
+     gridtolerance="10"
+     guidetolerance="10"
+     inkscape:pageopacity="0"
+     inkscape:pageshadow="2"
+     inkscape:window-width="1742"
+     inkscape:window-height="910"
+     id="namedview138"
+     showgrid="true"
+     inkscape:zoom="1.2864091"
+     inkscape:cx="231.4415"
+     inkscape:cy="205.83148"
+     inkscape:window-x="1676"
+     inkscape:window-y="113"
+     inkscape:window-maximized="0"
+     inkscape:current-layer="layer1"
+     fit-margin-top="0"
+     fit-margin-left="0"
+     fit-margin-right="0"
+     fit-margin-bottom="0">
+    <inkscape:grid
+       type="xygrid"
+       id="grid2224"
+       originx="33.072915"
+       originy="-46.257384" />
+  </sodipodi:namedview>
+  <title
+     id="title2">Thin Provisioning Write</title>
+  <defs
+     id="defs22">
+    <marker
+       inkscape:stockid="Arrow1Mstart"
+       orient="auto"
+       refY="0"
+       refX="0"
+       id="marker2683-6"
+       style="overflow:visible"
+       inkscape:isstock="true">
+      <path
+         id="path2681-3"
+         d="M 0,0 5,-5 -12.5,0 5,5 Z"
+         style="fill:#000000;fill-opacity:1;fill-rule:evenodd;stroke:#000000;stroke-width:1.00000003pt;stroke-opacity:1"
+         transform="matrix(0.4,0,0,0.4,4,0)"
+         inkscape:connector-curvature="0" />
+    </marker>
+    <marker
+       inkscape:stockid="Arrow1Mend"
+       orient="auto"
+       refY="0"
+       refX="0"
+       id="marker2679-9"
+       style="overflow:visible"
+       inkscape:isstock="true">
+      <path
+         id="path2677-8"
+         d="M 0,0 5,-5 -12.5,0 5,5 Z"
+         style="fill:#000000;fill-opacity:1;fill-rule:evenodd;stroke:#000000;stroke-width:1.00000003pt;stroke-opacity:1"
+         transform="matrix(-0.4,0,0,-0.4,-4,0)"
+         inkscape:connector-curvature="0" />
+    </marker>
+    <marker
+       inkscape:stockid="Arrow1Mstart"
+       orient="auto"
+       refY="0"
+       refX="0"
+       id="marker2464-2-6-1"
+       style="overflow:visible"
+       inkscape:isstock="true">
+      <path
+         id="path2462-7-8-2"
+         d="M 0,0 5,-5 -12.5,0 5,5 Z"
+         style="fill:#999999;fill-opacity:1;fill-rule:evenodd;stroke:#999999;stroke-width:1.00000003pt;stroke-opacity:1"
+         transform="matrix(0.4,0,0,0.4,4,0)"
+         inkscape:connector-curvature="0" />
+    </marker>
+    <marker
+       inkscape:stockid="Arrow1Mend"
+       orient="auto"
+       refY="0"
+       refX="0"
+       id="marker2468-8-9-5"
+       style="overflow:visible"
+       inkscape:isstock="true">
+      <path
+         id="path2466-1-3-2"
+         d="M 0,0 5,-5 -12.5,0 5,5 Z"
+         style="fill:#999999;fill-opacity:1;fill-rule:evenodd;stroke:#999999;stroke-width:1.00000003pt;stroke-opacity:1"
+         transform="matrix(-0.4,0,0,-0.4,-4,0)"
+         inkscape:connector-curvature="0" />
+    </marker>
+    <marker
+       inkscape:stockid="Arrow1Mstart"
+       orient="auto"
+       refY="0"
+       refX="0"
+       id="marker2464-2-0"
+       style="overflow:visible"
+       inkscape:isstock="true">
+      <path
+         id="path2462-7-6"
+         d="M 0,0 5,-5 -12.5,0 5,5 Z"
+         style="fill:#999999;fill-opacity:1;fill-rule:evenodd;stroke:#999999;stroke-width:1.00000003pt;stroke-opacity:1"
+         transform="matrix(0.4,0,0,0.4,4,0)"
+         inkscape:connector-curvature="0" />
+    </marker>
+    <marker
+       inkscape:stockid="Arrow1Mend"
+       orient="auto"
+       refY="0"
+       refX="0"
+       id="marker2468-8-8"
+       style="overflow:visible"
+       inkscape:isstock="true">
+      <path
+         id="path2466-1-5"
+         d="M 0,0 5,-5 -12.5,0 5,5 Z"
+         style="fill:#999999;fill-opacity:1;fill-rule:evenodd;stroke:#999999;stroke-width:1.00000003pt;stroke-opacity:1"
+         transform="matrix(-0.4,0,0,-0.4,-4,0)"
+         inkscape:connector-curvature="0" />
+    </marker>
+    <marker
+       inkscape:stockid="Arrow1Mstart"
+       orient="auto"
+       refY="0"
+       refX="0"
+       id="marker2659-1"
+       style="overflow:visible"
+       inkscape:isstock="true">
+      <path
+         id="path2657-7"
+         d="M 0,0 5,-5 -12.5,0 5,5 Z"
+         style="fill:#0000ff;fill-opacity:1;fill-rule:evenodd;stroke:#0000ff;stroke-width:1.00000003pt;stroke-opacity:1"
+         transform="matrix(0.4,0,0,0.4,4,0)"
+         inkscape:connector-curvature="0" />
+    </marker>
+    <marker
+       inkscape:isstock="true"
+       style="overflow:visible"
+       id="marker1826-2-4-7-1-7-5-27-1"
+       refX="0"
+       refY="0"
+       orient="auto"
+       inkscape:stockid="Arrow1Mend">
+      <path
+         inkscape:connector-curvature="0"
+         transform="matrix(-0.4,0,0,-0.4,-4,0)"
+         style="fill:#0000ff;fill-opacity:1;fill-rule:evenodd;stroke:#0000ff;stroke-width:1.00000003pt;stroke-opacity:1"
+         d="M 0,0 5,-5 -12.5,0 5,5 Z"
+         id="path1824-9-4-2-5-2-9-4-0" />
+    </marker>
+    <marker
+       inkscape:stockid="Arrow1Mstart"
+       orient="auto"
+       refY="0"
+       refX="0"
+       id="marker2667-4"
+       style="overflow:visible"
+       inkscape:isstock="true">
+      <path
+         id="path2665-0"
+         d="M 0,0 5,-5 -12.5,0 5,5 Z"
+         style="fill:#0000ff;fill-opacity:1;fill-rule:evenodd;stroke:#0000ff;stroke-width:1.00000003pt;stroke-opacity:1"
+         transform="matrix(0.4,0,0,0.4,4,0)"
+         inkscape:connector-curvature="0" />
+    </marker>
+    <marker
+       inkscape:isstock="true"
+       style="overflow:visible"
+       id="marker1826-2-4-7-1-7-5-9"
+       refX="0"
+       refY="0"
+       orient="auto"
+       inkscape:stockid="Arrow1Mend">
+      <path
+         inkscape:connector-curvature="0"
+         transform="matrix(-0.4,0,0,-0.4,-4,0)"
+         style="fill:#0000ff;fill-opacity:1;fill-rule:evenodd;stroke:#0000ff;stroke-width:1.00000003pt;stroke-opacity:1"
+         d="M 0,0 5,-5 -12.5,0 5,5 Z"
+         id="path1824-9-4-2-5-2-9-9" />
+    </marker>
+    <marker
+       inkscape:stockid="Arrow1Mstart"
+       orient="auto"
+       refY="0"
+       refX="0"
+       id="marker2464-3"
+       style="overflow:visible"
+       inkscape:isstock="true">
+      <path
+         id="path2462-5"
+         d="M 0,0 5,-5 -12.5,0 5,5 Z"
+         style="fill:#ff0000;fill-opacity:1;fill-rule:evenodd;stroke:#ff2a2a;stroke-width:1.00000003pt;stroke-opacity:1"
+         transform="matrix(0.4,0,0,0.4,4,0)"
+         inkscape:connector-curvature="0" />
+    </marker>
+    <marker
+       inkscape:stockid="Arrow1Mend"
+       orient="auto"
+       refY="0"
+       refX="0"
+       id="marker2468-5"
+       style="overflow:visible"
+       inkscape:isstock="true">
+      <path
+         id="path2466-4"
+         d="M 0,0 5,-5 -12.5,0 5,5 Z"
+         style="fill:#ff0000;fill-opacity:1;fill-rule:evenodd;stroke:#ff2a2a;stroke-width:1.00000003pt;stroke-opacity:1"
+         transform="matrix(-0.4,0,0,-0.4,-4,0)"
+         inkscape:connector-curvature="0" />
+    </marker>
+    <marker
+       inkscape:stockid="Arrow1Mstart"
+       orient="auto"
+       refY="0"
+       refX="0"
+       id="marker2663-8"
+       style="overflow:visible"
+       inkscape:isstock="true">
+      <path
+         id="path2661-0"
+         d="M 0,0 5,-5 -12.5,0 5,5 Z"
+         style="fill:#0000ff;fill-opacity:1;fill-rule:evenodd;stroke:#0000ff;stroke-width:1.00000003pt;stroke-opacity:1"
+         transform="matrix(0.4,0,0,0.4,4,0)"
+         inkscape:connector-curvature="0" />
+    </marker>
+    <marker
+       inkscape:isstock="true"
+       style="overflow:visible"
+       id="marker1826-2-4-7-1-7-97"
+       refX="0"
+       refY="0"
+       orient="auto"
+       inkscape:stockid="Arrow1Mend">
+      <path
+         inkscape:connector-curvature="0"
+         transform="matrix(-0.4,0,0,-0.4,-4,0)"
+         style="fill:#0000ff;fill-opacity:1;fill-rule:evenodd;stroke:#0000ff;stroke-width:1.00000003pt;stroke-opacity:1"
+         d="M 0,0 5,-5 -12.5,0 5,5 Z"
+         id="path1824-9-4-2-5-2-93" />
+    </marker>
+  </defs>
+  <metadata
+     id="metadata24">
+    <rdf:RDF>
+      <cc:Work
+         rdf:about="">
+        <dc:format>image/svg+xml</dc:format>
+        <dc:type
+           rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
+        <dc:title>Thin Provisioning Write</dc:title>
+      </cc:Work>
+    </rdf:RDF>
+  </metadata>
+  <g
+     inkscape:groupmode="layer"
+     id="layer1"
+     inkscape:label="Layer 1"
+     style="display:inline"
+     transform="translate(-20.09375,9.9883163e-4)">
+    <rect
+       style="fill:#ffffff;fill-opacity:1;stroke:none;stroke-width:0.52916664;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1"
+       id="rect2890"
+       width="169.33331"
+       height="52.916664"
+       x="20.09375"
+       y="0.043701001" />
+    <rect
+       x="70.364159"
+       y="19.887449"
+       width="22.49"
+       height="6.6146002"
+       id="rect104"
+       style="fill:#fff6d5;fill-opacity:1;stroke:#000000;stroke-width:0.26458001" />
+    <rect
+       style="fill:none;stroke:#999999;stroke-width:0.26458332;stroke-miterlimit:4;stroke-dasharray:none"
+       id="rect132"
+       ry="1.3229001"
+       height="30.427082"
+       width="33.072914"
+       y="-96.822914"
+       x="11.949952"
+       transform="rotate(90)" />
+    <text
+       x="76.792732"
+       y="24.435831"
+       font-size="3.5278px"
+       style="font-size:3.52780008px;line-height:1.25;font-family:sans-serif;font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;letter-spacing:0px;word-spacing:0px;fill:#000000;stroke-width:0.26458001"
+       xml:space="preserve"
+       id="text90">LUN0</text>
+    <rect
+       x="70.364159"
+       y="27.824934"
+       width="22.49"
+       height="6.6146002"
+       id="rect104-6"
+       style="fill:#fff6d5;fill-opacity:1;stroke:#000000;stroke-width:0.26458001" />
+    <text
+       x="69.098686"
+       y="16.596354"
+       font-size="3.5278px"
+       style="font-size:3.52780008px;line-height:1.25;font-family:sans-serif;font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;letter-spacing:0px;word-spacing:0px;fill:#000000;stroke-width:0.26458001"
+       xml:space="preserve"
+       id="text90-5">Target: disk1</text>
+    <text
+       x="76.904396"
+       y="32.273182"
+       font-size="3.5278px"
+       style="font-size:3.52780008px;line-height:1.25;font-family:sans-serif;font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;letter-spacing:0px;word-spacing:0px;fill:#000000;stroke-width:0.26458001"
+       xml:space="preserve"
+       id="text90-59">LUN1</text>
+    <text
+       x="63.376305"
+       y="6.9721842"
+       font-size="3.5278px"
+       style="font-size:3.52780008px;line-height:1.25;font-family:sans-serif;font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;letter-spacing:0px;word-spacing:0px;fill:#000000;stroke-width:0.26458001"
+       xml:space="preserve"
+       id="text90-5-5">iSCSI Target server</text>
+    <rect
+       x="28.030828"
+       y="19.887449"
+       width="22.49"
+       height="6.6146002"
+       id="rect104-64"
+       style="fill:#fff6d5;fill-opacity:1;stroke:#000000;stroke-width:0.26458001" />
+    <text
+       x="33.225346"
+       y="24.641508"
+       font-size="3.5278px"
+       style="font-size:3.52780008px;line-height:1.25;font-family:sans-serif;font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;letter-spacing:0px;word-spacing:0px;fill:#000000;stroke-width:0.26458001"
+       xml:space="preserve"
+       id="text90-56">Malloc0</text>
+    <rect
+       x="28.03083"
+       y="27.824945"
+       width="22.49"
+       height="6.6146002"
+       id="rect104-6-9"
+       style="fill:#fff6d5;fill-opacity:1;stroke:#000000;stroke-width:0.26458001" />
+    <text
+       x="33.337006"
+       y="32.273182"
+       font-size="3.5278px"
+       style="font-size:3.52780008px;line-height:1.25;font-family:sans-serif;font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;letter-spacing:0px;word-spacing:0px;fill:#000000;stroke-width:0.26458001"
+       xml:space="preserve"
+       id="text90-59-2">Malloc1</text>
+    <rect
+       style="fill:none;stroke:#999999;stroke-width:0.5"
+       id="rect132-6"
+       ry="1.3229001"
+       height="50.270836"
+       width="47.624996"
+       y="-111.375"
+       x="2.6895342"
+       transform="rotate(90)" />
+    <rect
+       style="fill:none;stroke:#999999;stroke-width:0.5"
+       id="rect132-6-8"
+       ry="1.3229001"
+       height="33.072918"
+       width="27.781242"
+       y="-55.812492"
+       x="11.949948"
+       transform="rotate(90)" />
+    <path
+       sodipodi:nodetypes="cc"
+       inkscape:connector-curvature="0"
+       id="path1192-8-7-7-4-2-6"
+       d="m 50.520827,31.793698 19.843748,3e-6"
+       style="fill:#0000ff;stroke:#0000ff;stroke-width:0.26499999;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1;marker-start:url(#marker2667-4);marker-end:url(#marker1826-2-4-7-1-7-5-9)" />
+    <path
+       sodipodi:nodetypes="cc"
+       inkscape:connector-curvature="0"
+       id="path1192-8-7-7-4-2"
+       d="m 50.520827,23.856198 19.843748,2e-6"
+       style="fill:#0000ff;stroke:#0000ff;stroke-width:0.26499999;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1;marker-start:url(#marker2663-8);marker-end:url(#marker1826-2-4-7-1-7-97)" />
+    <rect
+       x="103.4371"
+       y="37.085365"
+       width="18.521248"
+       height="6.6145835"
+       id="rect104-63"
+       style="fill:#fff6d5;fill-opacity:1;stroke:#000000;stroke-width:0.26458001" />
+    <text
+       x="105.57915"
+       y="41.386662"
+       font-size="3.5278px"
+       style="font-size:3.52780008px;line-height:1.25;font-family:sans-serif;font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;letter-spacing:0px;word-spacing:0px;fill:#000000;stroke-width:0.26458001"
+       xml:space="preserve"
+       id="text90-1">portal 1</text>
+    <text
+       x="25.394737"
+       y="15.738133"
+       font-size="3.5278px"
+       style="font-size:3.52780008px;line-height:1.25;font-family:sans-serif;font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;letter-spacing:0px;word-spacing:0px;fill:#000000;stroke-width:0.26458001"
+       xml:space="preserve"
+       id="text90-5-5-8">SPDK bdevs</text>
+    <path
+       sodipodi:nodetypes="cc"
+       inkscape:connector-curvature="0"
+       id="path1192-8-7-7-4-2-6-4"
+       d="M 96.822918,41.054113 H 103.4375"
+       style="fill:#0000ff;stroke:#0000ff;stroke-width:0.26511249;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1;marker-start:url(#marker2659-1);marker-end:url(#marker1826-2-4-7-1-7-5-27-1)" />
+    <rect
+       x="158.99957"
+       y="37.08535"
+       width="22.49"
+       height="6.6146002"
+       id="rect104-63-9"
+       style="fill:#fff6d5;fill-opacity:1;stroke:#000000;stroke-width:0.26458001" />
+    <text
+       x="161.96524"
+       y="41.69516"
+       font-size="3.5278px"
+       style="font-size:3.52780008px;line-height:1.25;font-family:sans-serif;font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;letter-spacing:0px;word-spacing:0px;fill:#000000;stroke-width:0.26458001"
+       xml:space="preserve"
+       id="text90-1-8">initiator 2</text>
+    <rect
+       style="fill:none;stroke:#999999;stroke-width:0.5"
+       id="rect132-6-1"
+       ry="1.3229001"
+       height="33.072933"
+       width="38.364578"
+       y="-186.78125"
+       x="11.949951"
+       transform="rotate(90)" />
+    <text
+       x="156.03279"
+       y="15.81625"
+       font-size="3.5278px"
+       style="font-size:3.52780008px;line-height:1.25;font-family:sans-serif;font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;letter-spacing:0px;word-spacing:0px;fill:#000000;stroke-width:0.26458001"
+       xml:space="preserve"
+       id="text90-5-5-7">iSCSI client 0</text>
+    <text
+       x="101.36903"
+       y="47.613781"
+       font-size="3.5278px"
+       style="font-size:3.52780008px;line-height:1.25;font-family:sans-serif;font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;letter-spacing:0px;word-spacing:0px;fill:#000000;stroke-width:0.26458001"
+       xml:space="preserve"
+       id="text90-5-7">10.0.0.1:3260</text>
+    <rect
+       x="161.64542"
+       y="19.887432"
+       width="19.844177"
+       height="6.6146011"
+       id="rect104-9"
+       style="fill:#fff6d5;fill-opacity:1;stroke:#000000;stroke-width:0.26458001" />
+    <text
+       x="168.07399"
+       y="24.435814"
+       font-size="3.5278px"
+       style="font-size:3.52780008px;line-height:1.25;font-family:sans-serif;font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;letter-spacing:0px;word-spacing:0px;fill:#000000;stroke-width:0.26458001"
+       xml:space="preserve"
+       id="text90-7">sdd</text>
+    <rect
+       x="161.64542"
+       y="27.824913"
+       width="19.844177"
+       height="6.6146178"
+       id="rect104-6-8"
+       style="fill:#fff6d5;fill-opacity:1;stroke:#000000;stroke-width:0.26458001" />
+    <text
+       x="168.18565"
+       y="32.273163"
+       font-size="3.5278px"
+       style="font-size:3.52780008px;line-height:1.25;font-family:sans-serif;font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;letter-spacing:0px;word-spacing:0px;fill:#000000;stroke-width:0.26458001"
+       xml:space="preserve"
+       id="text90-59-1">sde</text>
+    <path
+       sodipodi:nodetypes="cc"
+       inkscape:connector-curvature="0"
+       id="path11761-9-7-0"
+       d="m 92.854164,23.8562 68.791666,-1e-6"
+       style="fill:#999999;fill-opacity:1;stroke:#999999;stroke-width:0.26511249;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:1.06044998, 1.06044998;stroke-dashoffset:0;stroke-opacity:1;marker-start:url(#marker2464-2-0);marker-end:url(#marker2468-8-8)" />
+    <path
+       sodipodi:nodetypes="cc"
+       inkscape:connector-curvature="0"
+       id="path11761-9-7-0-0"
+       d="m 92.854164,31.7937 68.791666,-2e-6"
+       style="fill:#999999;fill-opacity:1;stroke:#999999;stroke-width:0.26511249;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:1.06044998, 1.06044998;stroke-dashoffset:0;stroke-opacity:1;marker-start:url(#marker2464-2-6-1);marker-end:url(#marker2468-8-9-5)" />
+    <text
+       x="160.41017"
+       y="47.490952"
+       font-size="3.5278px"
+       style="font-size:3.52780008px;line-height:1.25;font-family:sans-serif;font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;letter-spacing:0px;word-spacing:0px;fill:#000000;stroke-width:0.26458001"
+       xml:space="preserve"
+       id="text90-5-7-2">10.0.0.2/32</text>
+    <path
+       style="fill:none;stroke:#999999;stroke-width:0.26458332px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+       d="M 125.92708,51.63745 144.44792,0.04369787"
+       id="path2638"
+       inkscape:connector-curvature="0"
+       sodipodi:nodetypes="cc" />
+    <path
+       style="fill:none;stroke:#999999;stroke-width:0.26458332px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+       d="M 127.25,52.960366 145.77084,1.3666139"
+       id="path2640"
+       inkscape:connector-curvature="0"
+       sodipodi:nodetypes="cc" />
+    <path
+       sodipodi:nodetypes="cc"
+       inkscape:connector-curvature="0"
+       id="path11761-9-7"
+       d="M 121.95833,41.054117 159,41.054115"
+       style="fill:#ff0000;stroke:#ff2a2a;stroke-width:0.26499999;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1;marker-start:url(#marker2464-3);marker-end:url(#marker2468-5)" />
+    <text
+       x="122.73377"
+       y="8.7427139"
+       font-size="3.5278px"
+       style="font-size:3.52780008px;line-height:1.25;font-family:sans-serif;font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;letter-spacing:0px;word-spacing:0px;fill:#000000;stroke-width:0.26458001"
+       xml:space="preserve"
+       id="text90-5-5-9">TCP Network</text>
+    <path
+       style="fill:none;stroke:#000000;stroke-width:0.52916664;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1;marker-start:url(#marker2683-6);marker-end:url(#marker2679-9)"
+       d="M 124.60417,11.949951 H 143.125"
+       id="path2669"
+       inkscape:connector-curvature="0" />
+  </g>
+</svg>
diff --git a/src/spdk/doc/img/lvol_clone_snapshot_read.svg b/src/spdk/doc/img/lvol_clone_snapshot_read.svg
new file mode 100644
index 00000000..0f91d417
--- /dev/null
+++ b/src/spdk/doc/img/lvol_clone_snapshot_read.svg
@@ -0,0 +1,3 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+<svg width="173.3mm" height="87.312mm" version="1.1" viewBox="0 0 173.3 87.312" xmlns="http://www.w3.org/2000/svg" xmlns:cc="http://creativecommons.org/ns#" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"><defs><marker id="a" overflow="visible" orient="auto"><path transform="scale(.4) rotate(180) translate(10)" d="m0 0 5-5-17.5 5 17.5 5-5-5z" fill-rule="evenodd" stroke="#000" stroke-width="1pt"/></marker><marker id="Arrow1Mend" overflow="visible" orient="auto"><path transform="scale(.4) rotate(180) translate(10)" d="m0 0 5-5-17.5 5 17.5 5-5-5z" fill-rule="evenodd" stroke="#000" stroke-width="1pt"/></marker><marker id="g" overflow="visible" orient="auto"><path transform="matrix(-.4 0 0 -.4 -4 0)" d="m0 0 5-5-17.5 5 17.5 5z" fill-rule="evenodd" stroke="#000" stroke-width="1pt"/></marker><marker id="f" overflow="visible" orient="auto"><path transform="matrix(-.4 0 0 -.4 -4 0)" d="m0 0 5-5-17.5 5 17.5 5z" fill="#00f" fill-rule="evenodd" stroke="#00f" stroke-width="1pt"/></marker><marker id="h" overflow="visible" orient="auto"><path transform="matrix(-.4 0 0 -.4 -4 0)" d="m0 0 5-5-17.5 5 17.5 5z" fill="#00f" fill-rule="evenodd" stroke="#00f" stroke-width="1pt"/></marker><marker id="d" overflow="visible" orient="auto"><path transform="matrix(-.4 0 0 -.4 -4 0)" d="m0 0 5-5-17.5 5 17.5 5z" fill="#00f" fill-rule="evenodd" stroke="#00f" stroke-width="1pt"/></marker><marker id="b" overflow="visible" orient="auto"><path transform="matrix(-.4 0 0 -.4 -4 0)" d="m0 0 5-5-17.5 5 17.5 5z" fill="#00f" fill-rule="evenodd" stroke="#00f" stroke-width="1pt"/></marker><marker id="c" overflow="visible" orient="auto"><path transform="matrix(-.4 0 0 -.4 -4 0)" d="m0 0 5-5-17.5 5 17.5 5z" fill="#00f" fill-rule="evenodd" stroke="#00f" stroke-width="1pt"/></marker><marker id="e" overflow="visible" orient="auto"><path transform="matrix(-.4 0 0 -.4 -4 0)" d="m0 0 5-5-17.5 5 17.5 5z" fill="#00f" fill-rule="evenodd" stroke="#00f" stroke-width="1pt"/></marker></defs><metadata><rdf:RDF><cc:Work rdf:about=""><dc:format>image/svg+xml</dc:format><dc:type rdf:resource="http://purl.org/dc/dcmitype/StillImage"/><dc:title/></cc:Work></rdf:RDF></metadata><g transform="translate(2.6458 2.5135)"><rect x="-2.6458" y="-2.5135" width="173.3" height="87.312" ry="0" fill="#fff"/><path d="m5.2917 53.049v-9.2604" fill="none" marker-end="url(#a)" stroke="#000" stroke-width=".26458px"/><path d="m5.2917 38.497v-9.2604" fill="none" marker-end="url(#Arrow1Mend)" stroke="#000" stroke-width=".26458px"/></g><g transform="translate(-14.552 -4.6354)"><g stroke="#000" stroke-width=".26458"><rect x="47.625" y="29.771" width="22.49" height="6.6146" fill="none" stroke-dasharray="0.52916663, 0.52916663"/><rect x="70.115" y="29.771" width="22.49" height="6.6146" fill="#d7d7f4"/><rect x="92.604" y="29.771" width="22.49" height="6.6146" fill="#d7d7f4"/><rect x="115.09" y="29.771" width="22.49" height="6.6146" fill="none" stroke-dasharray="0.52916663, 0.52916663"/><rect x="137.58" y="29.771" width="22.49" height="6.6146" fill="none" stroke-dasharray="0.52916663, 0.52916663"/><rect x="160.07" y="29.771" width="22.49" height="6.6146" fill="#d7d7f4"/></g><g fill="#d7f4d7" stroke="#000" stroke-width=".26458"><rect x="92.604" y="44.323" width="22.49" height="6.6146"/><rect x="115.09" y="44.323" width="22.49" height="6.6146"/><rect x="137.58" y="44.323" width="22.49" height="6.6146"/><rect x="160.07" y="44.323" width="22.49" height="6.6146"/></g><text x="18.309231" y="49.435097" fill="#000000" font-family="sans-serif" font-size="3.5278px" letter-spacing="0px" stroke-width=".26458" word-spacing="0px" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal;line-height:1.25" xml:space="preserve"><tspan x="18.309231" y="49.435097" stroke-width=".26458">snapshot</tspan></text><text x="18.362614" y="11.230336" fill="#000000" font-family="sans-serif" font-size="3.5278px" letter-spacing="0px" stroke-width=".26458" word-spacing="0px" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal;line-height:1.25" xml:space="preserve"><tspan x="18.362614" y="11.230336" stroke-width=".26458">read</tspan></text><g stroke="#000"><path d="m17.198 21.833 168.01-1e-6" fill="none" stroke-dasharray="1.59, 1.59" stroke-width=".265"/><g stroke-width=".26458"><rect x="47.625" y="7.2812" width="22.49" height="6.6146" fill="#f4d7d7" stroke-dasharray="0.52916663, 0.26458332"/><rect x="115.09" y="7.2813" width="22.49" height="6.6146" fill="#d7f4d7"/><rect x="137.58" y="7.2812" width="22.49" height="6.6146" fill="#d7f4d7"/></g></g><g fill="#d7d7f4" stroke="#000" stroke-width=".26458"><rect x="70.115" y="7.2813" width="22.49" height="6.6146"/><rect x="92.604" y="7.2813" width="22.49" height="6.6146"/><rect x="160.07" y="7.2813" width="22.49" height="6.6146"/></g><text x="18.280743" y="35.463409" fill="#000000" font-family="sans-serif" font-size="3.5278px" letter-spacing="0px" stroke-width=".26458" word-spacing="0px" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal;line-height:1.25" xml:space="preserve"><tspan x="18.280743" y="35.463409" stroke-width=".26458">clone</tspan></text><rect x="47.625" y="58.875" width="22.49" height="6.6146" fill="#f4d7d7" stroke="#000" stroke-dasharray="0.52999997, 0.26499999" stroke-width=".265"/><text x="59.058754" y="63.505211" fill="#000000" font-family="sans-serif" font-size="10.583px" letter-spacing="0px" stroke-width=".26458" word-spacing="0px" style="line-height:1.25" xml:space="preserve"><tspan x="59.058754" y="63.505211" font-family="sans-serif" font-size="3.5278px" stroke-width=".26458" text-align="center" text-anchor="middle" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal">00000...</tspan></text><rect x="70.115" y="58.875" width="22.49" height="6.6146" fill="#f4d7d7" stroke="#000" stroke-dasharray="0.52999997, 0.26499999" stroke-width=".265"/><text x="81.54834" y="63.505211" fill="#000000" font-family="sans-serif" font-size="10.583px" letter-spacing="0px" stroke-width=".26458" word-spacing="0px" style="line-height:1.25" xml:space="preserve"><tspan x="81.54834" y="63.505211" font-family="sans-serif" font-size="3.5278px" stroke-width=".26458" text-align="center" text-anchor="middle" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal">00000...</tspan></text><rect x="92.604" y="58.875" width="22.49" height="6.6146" fill="#f4d7d7" stroke="#000" stroke-dasharray="0.52999997, 0.26499999" stroke-width=".265"/><text x="104.03793" y="63.505211" fill="#000000" font-family="sans-serif" font-size="10.583px" letter-spacing="0px" stroke-width=".26458" word-spacing="0px" style="line-height:1.25" xml:space="preserve"><tspan x="104.03793" y="63.505211" font-family="sans-serif" font-size="3.5278px" stroke-width=".26458" text-align="center" text-anchor="middle" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal">00000...</tspan></text><rect x="115.09" y="58.875" width="22.49" height="6.6146" fill="#f4d7d7" stroke="#000" stroke-dasharray="0.52999997, 0.26499999" stroke-width=".265"/><text x="126.52751" y="63.505211" fill="#000000" font-family="sans-serif" font-size="10.583px" letter-spacing="0px" stroke-width=".26458" word-spacing="0px" style="line-height:1.25" xml:space="preserve"><tspan x="126.52751" y="63.505211" font-family="sans-serif" font-size="3.5278px" stroke-width=".26458" text-align="center" text-anchor="middle" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal">00000...</tspan></text><rect x="137.58" y="58.875" width="22.49" height="6.6146" fill="#f4d7d7" stroke="#000" stroke-dasharray="0.52999997, 0.26499999" stroke-width=".265"/><text x="149.01709" y="63.505211" fill="#000000" font-family="sans-serif" font-size="10.583px" letter-spacing="0px" stroke-width=".26458" word-spacing="0px" style="line-height:1.25" xml:space="preserve"><tspan x="149.01709" y="63.505211" font-family="sans-serif" font-size="3.5278px" stroke-width=".26458" text-align="center" text-anchor="middle" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal">00000...</tspan></text><rect x="160.07" y="58.875" width="22.49" height="6.6146" fill="#f4d7d7" stroke="#000" stroke-dasharray="0.52999997, 0.26499999" stroke-width=".265"/><text x="171.50665" y="63.505211" fill="#000000" font-family="sans-serif" font-size="10.583px" letter-spacing="0px" stroke-width=".26458" word-spacing="0px" style="line-height:1.25" xml:space="preserve"><tspan x="171.50665" y="63.505211" font-family="sans-serif" font-size="3.5278px" stroke-width=".26458" text-align="center" text-anchor="middle" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal">00000...</tspan></text><text x="18.309223" y="63.987183" fill="#000000" font-family="sans-serif" font-size="3.5278px" letter-spacing="0px" stroke-width=".26458" word-spacing="0px" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal;line-height:1.25" xml:space="preserve"><tspan x="18.309223" y="63.987183" stroke-width=".26458">zeroes_dev</tspan></text><g fill="none"><rect x="47.625" y="44.323" width="22.49" height="6.6146" stroke="#000" stroke-dasharray="0.52916663, 0.52916663" stroke-width=".26458"/><rect x="70.115" y="44.323" width="22.49" height="6.6146" stroke="#000" stroke-dasharray="0.52916663, 0.52916663" stroke-width=".26458"/><rect x="39.688" y="27.125" width="145.52" height="11.906" ry="1.3229" stroke="#808080" stroke-width=".265"/><rect x="39.688" y="41.677" width="145.52" height="11.906" ry="1.3229" stroke="#808080" stroke-width=".265"/></g><g fill="#00f" stroke="#00f" stroke-width=".265"><path d="m80.698 13.896v15.875" marker-end="url(#c)"/><path d="m58.208 13.896v44.979" marker-end="url(#b)"/><path d="m103.19 13.896v15.875" marker-end="url(#d)"/><path d="m171.98 13.896v15.875" marker-end="url(#h)"/><path d="m127 13.896v30.427" marker-end="url(#f)"/><path d="m149.49 13.896v30.427" marker-end="url(#g)"/><path d="m124.35 74.75 10.583 3e-6" marker-end="url(#e)"/></g><g stroke-width=".26458"><text x="137.58331" y="76.072906" fill="#000000" font-family="sans-serif" font-size="3.5278px" letter-spacing="0px" word-spacing="0px" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal;line-height:1.25" xml:space="preserve"><tspan x="137.58331" y="76.072906" font-family="sans-serif" font-size="2.8222px" stroke-width=".26458" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal">read cluster</tspan></text><rect x="124.35" y="78.719" width="10.583" height="2.6458" fill="none" stroke="#000" stroke-dasharray="0.52916663, 0.52916663"/><text x="137.58331" y="81.364571" fill="#000000" font-family="sans-serif" font-size="3.5278px" letter-spacing="0px" word-spacing="0px" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal;line-height:1.25" xml:space="preserve"><tspan x="137.58331" y="81.364571" font-family="sans-serif" font-size="2.8222px" stroke-width=".26458" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal">unallocated cluster</tspan></text></g><rect x="124.35" y="84.01" width="10.583" height="2.6458" fill="none" stroke="#000" stroke-width=".265"/><text x="137.58331" y="86.656242" fill="#000000" font-family="sans-serif" font-size="3.5278px" letter-spacing="0px" stroke-width=".26458" word-spacing="0px" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal;line-height:1.25" xml:space="preserve"><tspan x="137.58331" y="86.656242" font-family="sans-serif" font-size="2.8222px" stroke-width=".26458" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal">allocated cluster</tspan></text></g></svg>
diff --git a/src/spdk/doc/img/lvol_clone_snapshot_write.svg b/src/spdk/doc/img/lvol_clone_snapshot_write.svg
new file mode 100644
index 00000000..d5da5813
--- /dev/null
+++ b/src/spdk/doc/img/lvol_clone_snapshot_write.svg
@@ -0,0 +1,3 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+<svg width="173.3mm" height="91.281mm" version="1.1" viewBox="0 0 173.3 91.281" xmlns="http://www.w3.org/2000/svg" xmlns:cc="http://creativecommons.org/ns#" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"><defs><marker id="h" overflow="visible" orient="auto"><path transform="matrix(-.4 0 0 -.4 -4 0)" d="m0 0 5-5-17.5 5 17.5 5z" fill="#f00" fill-rule="evenodd" stroke="#ff2a2a" stroke-width="1pt"/></marker><marker id="e" overflow="visible" orient="auto"><path transform="matrix(-.4 0 0 -.4 -4 0)" d="m0 0 5-5-17.5 5 17.5 5z" fill="#00f" fill-rule="evenodd" stroke="#00f" stroke-width="1pt"/></marker><marker id="d" overflow="visible" orient="auto"><path transform="matrix(-.4 0 0 -.4 -4 0)" d="m0 0 5-5-17.5 5 17.5 5z" fill="#00f" fill-rule="evenodd" stroke="#00f" stroke-width="1pt"/></marker><marker id="g" overflow="visible" orient="auto"><path transform="matrix(-.4 0 0 -.4 -4 0)" d="m0 0 5-5-17.5 5 17.5 5z" fill="#f00" fill-rule="evenodd" stroke="#ff2a2a" stroke-width="1pt"/></marker><marker id="b" overflow="visible" orient="auto"><path transform="matrix(-.4 0 0 -.4 -4 0)" d="m0 0 5-5-17.5 5 17.5 5z" fill="#00f" fill-rule="evenodd" stroke="#00f" stroke-width="1pt"/></marker><marker id="c" overflow="visible" orient="auto"><path transform="matrix(-.4 0 0 -.4 -4 0)" d="m0 0 5-5-17.5 5 17.5 5z" fill="#00f" fill-rule="evenodd" stroke="#00f" stroke-width="1pt"/></marker><marker id="f" overflow="visible" orient="auto"><path transform="matrix(-.4 0 0 -.4 -4 0)" d="m0 0 5-5-17.5 5 17.5 5z" fill="#f00" fill-rule="evenodd" stroke="#ff2a2a" stroke-width="1pt"/></marker><marker id="a" overflow="visible" orient="auto"><path transform="matrix(-.4 0 0 -.4 -4 0)" d="m0 0 5-5-17.5 5 17.5 5z" fill-rule="evenodd" stroke="#000" stroke-width="1pt"/></marker><marker id="Arrow1Mend" overflow="visible" orient="auto"><path transform="matrix(-.4 0 0 -.4 -4 0)" d="m0 0 5-5-17.5 5 17.5 5z" fill-rule="evenodd" stroke="#000" stroke-width="1pt"/></marker></defs><metadata><rdf:RDF><cc:Work rdf:about=""><dc:format>image/svg+xml</dc:format><dc:type rdf:resource="http://purl.org/dc/dcmitype/StillImage"/><dc:title/></cc:Work></rdf:RDF></metadata><g transform="translate(3.9688 -99.351)"><rect x="-3.9688" y="99.351" width="173.3" height="91.281" ry="0" fill="#fff"/></g><g transform="translate(1.3229 -101.86)"><g stroke="#000" stroke-dasharray="0.52916663, 0.52916663" stroke-width=".26458"><rect x="31.75" y="127" width="22.49" height="6.6146" fill="none"/><rect x="99.219" y="127" width="22.49" height="6.6146" fill="#d7f4d7"/><rect x="121.71" y="127" width="22.49" height="6.6146" fill="none"/></g><g fill="#d7d7f4" stroke="#000" stroke-width=".26458"><rect x="76.729" y="141.55" width="22.49" height="6.6146"/><rect x="99.219" y="141.55" width="22.49" height="6.6146"/><rect x="121.71" y="141.55" width="22.49" height="6.6146"/><rect x="144.2" y="141.55" width="22.49" height="6.6146"/></g><text x="2.4342299" y="146.66425" fill="#000000" font-family="sans-serif" font-size="3.5278px" letter-spacing="0px" stroke-width=".26458" word-spacing="0px" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal;line-height:1.25" xml:space="preserve"><tspan x="2.4342299" y="146.66425" stroke-width=".26458">snapshot</tspan></text><text x="2.4876127" y="108.4595" fill="#000000" font-family="sans-serif" font-size="3.5278px" letter-spacing="0px" stroke-width=".26458" word-spacing="0px" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal;line-height:1.25" xml:space="preserve"><tspan x="2.4876127" y="108.4595" stroke-width=".26458">write</tspan></text><path d="m1.3229 119.06 168.01 1e-5" fill="none" stroke="#000" stroke-dasharray="1.59000004, 1.59000004" stroke-width=".265"/><rect x="99.219" y="104.51" width="22.49" height="6.6146" fill="#fff6d5" stroke="#000" stroke-width=".26458"/><text x="2.4057417" y="132.69257" fill="#000000" font-family="sans-serif" font-size="3.5278px" letter-spacing="0px" stroke-width=".26458" word-spacing="0px" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal;line-height:1.25" xml:space="preserve"><tspan x="2.4057417" y="132.69257" stroke-width=".26458">clone</tspan></text><rect x="31.75" y="156.1" width="22.49" height="6.6146" fill="#f4d7d7" stroke="#000" stroke-dasharray="0.52999997, 0.26499999" stroke-width=".265"/><text x="43.183758" y="160.73438" fill="#000000" font-family="sans-serif" font-size="10.583px" letter-spacing="0px" stroke-width=".26458" word-spacing="0px" style="line-height:1.25" xml:space="preserve"><tspan x="43.183758" y="160.73438" font-family="sans-serif" font-size="3.5278px" stroke-width=".26458" text-align="center" text-anchor="middle" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal">00000...</tspan></text><rect x="54.24" y="156.1" width="22.49" height="6.6146" fill="#f4d7d7" stroke="#000" stroke-dasharray="0.52999997, 0.26499999" stroke-width=".265"/><text x="65.673347" y="160.73438" fill="#000000" font-family="sans-serif" font-size="10.583px" letter-spacing="0px" stroke-width=".26458" word-spacing="0px" style="line-height:1.25" xml:space="preserve"><tspan x="65.673347" y="160.73438" font-family="sans-serif" font-size="3.5278px" stroke-width=".26458" text-align="center" text-anchor="middle" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal">00000...</tspan></text><rect x="76.729" y="156.1" width="22.49" height="6.6146" fill="#f4d7d7" stroke="#000" stroke-dasharray="0.52999997, 0.26499999" stroke-width=".265"/><text x="88.162926" y="160.73438" fill="#000000" font-family="sans-serif" font-size="10.583px" letter-spacing="0px" stroke-width=".26458" word-spacing="0px" style="line-height:1.25" xml:space="preserve"><tspan x="88.162926" y="160.73438" font-family="sans-serif" font-size="3.5278px" stroke-width=".26458" text-align="center" text-anchor="middle" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal">00000...</tspan></text><rect x="99.219" y="156.1" width="22.49" height="6.6146" fill="#f4d7d7" stroke="#000" stroke-dasharray="0.52999997, 0.26499999" stroke-width=".265"/><text x="110.65253" y="160.73438" fill="#000000" font-family="sans-serif" font-size="10.583px" letter-spacing="0px" stroke-width=".26458" word-spacing="0px" style="line-height:1.25" xml:space="preserve"><tspan x="110.65253" y="160.73438" font-family="sans-serif" font-size="3.5278px" stroke-width=".26458" text-align="center" text-anchor="middle" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal">00000...</tspan></text><rect x="121.71" y="156.1" width="22.49" height="6.6146" fill="#f4d7d7" stroke="#000" stroke-dasharray="0.52999997, 0.26499999" stroke-width=".265"/><text x="133.14209" y="160.73438" fill="#000000" font-family="sans-serif" font-size="10.583px" letter-spacing="0px" stroke-width=".26458" word-spacing="0px" style="line-height:1.25" xml:space="preserve"><tspan x="133.14209" y="160.73438" font-family="sans-serif" font-size="3.5278px" stroke-width=".26458" text-align="center" text-anchor="middle" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal">00000...</tspan></text><rect x="144.2" y="156.1" width="22.49" height="6.6146" fill="#f4d7d7" stroke="#000" stroke-dasharray="0.52999997, 0.26499999" stroke-width=".265"/><text x="155.63165" y="160.73438" fill="#000000" font-family="sans-serif" font-size="10.583px" letter-spacing="0px" stroke-width=".26458" word-spacing="0px" style="line-height:1.25" xml:space="preserve"><tspan x="155.63165" y="160.73438" font-family="sans-serif" font-size="3.5278px" stroke-width=".26458" text-align="center" text-anchor="middle" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal">00000...</tspan></text><text x="2.4342222" y="161.21635" fill="#000000" font-family="sans-serif" font-size="3.5278px" letter-spacing="0px" stroke-width=".26458" word-spacing="0px" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal;line-height:1.25" xml:space="preserve"><tspan x="2.4342222" y="161.21635" stroke-width=".26458">zeroes_dev</tspan></text><g fill="none"><rect x="31.75" y="141.55" width="22.49" height="6.6146" stroke="#000" stroke-dasharray="0.52916663, 0.52916663" stroke-width=".26458"/><rect x="54.24" y="141.55" width="22.49" height="6.6146" stroke="#000" stroke-dasharray="0.52916663, 0.52916663" stroke-width=".26458"/><rect x="23.813" y="124.35" width="145.52" height="11.906" ry="1.3229" stroke="#808080" stroke-width=".265"/><rect x="23.813" y="138.91" width="145.52" height="11.906" ry="1.3229" stroke="#808080" stroke-width=".265"/></g><path d="m115.09 111.12v15.875" fill="#00f" marker-end="url(#e)" stroke="#00f" stroke-width=".265"/><path d="m105.83 141.55v-7.9375" fill="#f00" marker-end="url(#h)" stroke="#ff2a2a" stroke-width=".265"/><g stroke="#000" stroke-width=".26458"><rect x="54.24" y="127" width="22.49" height="6.6146" fill="#ffe3be" stroke-dasharray="0.52916663, 0.52916663"/><rect x="144.2" y="127" width="22.49" height="6.6146" fill="none" stroke-dasharray="0.52916663, 0.52916663"/><rect x="54.24" y="104.51" width="22.49" height="6.6146" fill="#fff6d5"/></g><g><path d="m70.115 111.12v15.875" fill="#00f" marker-end="url(#d)" stroke="#00f" stroke-width=".265"/><path d="m60.854 156.1v-22.49" fill="#f00" marker-end="url(#g)" stroke="#ff2a2a" stroke-width=".265"/><rect x="76.729" y="104.51" width="22.49" height="6.6146" fill="#fff6d5" stroke="#000" stroke-width=".26458"/></g><g stroke-width=".265"><path d="m87.313 111.12v15.875" fill="#00f" marker-end="url(#b)" stroke="#00f"/><path d="m109.8 170.66 10.583 1e-5" fill="#00f" marker-end="url(#c)" stroke="#00f"/><path d="m109.8 175.95h10.583" fill="#f00" marker-end="url(#f)" stroke="#ff2a2a"/></g><g stroke-width=".26458"><text x="123.03123" y="171.97917" fill="#000000" font-family="sans-serif" font-size="3.5278px" letter-spacing="0px" word-spacing="0px" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal;line-height:1.25" xml:space="preserve"><tspan x="123.03123" y="171.97917" font-family="sans-serif" font-size="2.8222px" stroke-width=".26458" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal">write</tspan></text><text x="123.03123" y="177.27084" fill="#000000" font-family="sans-serif" font-size="3.5278px" letter-spacing="0px" word-spacing="0px" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal;line-height:1.25" xml:space="preserve"><tspan x="123.03123" y="177.27084" font-family="sans-serif" font-size="2.8222px" stroke-width=".26458" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal">allocate and copy cluster</tspan></text><rect x="109.8" y="179.92" width="10.583" height="2.6458" fill="none" stroke="#000" stroke-dasharray="0.52916663, 0.52916663"/><text x="123.03123" y="182.5625" fill="#000000" font-family="sans-serif" font-size="3.5278px" letter-spacing="0px" word-spacing="0px" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal;line-height:1.25" xml:space="preserve"><tspan x="123.03123" y="182.5625" font-family="sans-serif" font-size="2.8222px" stroke-width=".26458" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal">unallocated cluster before write</tspan></text></g><rect x="109.8" y="185.21" width="10.583" height="2.6458" fill="none" stroke="#000" stroke-width=".265"/><text x="123.03123" y="187.85417" fill="#000000" font-family="sans-serif" font-size="3.5278px" letter-spacing="0px" stroke-width=".26458" word-spacing="0px" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal;line-height:1.25" xml:space="preserve"><tspan x="123.03123" y="187.85417" font-family="sans-serif" font-size="2.8222px" stroke-width=".26458" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal">allocated cluster</tspan></text><g stroke="#000"><rect x="76.729" y="127" width="22.49" height="6.6146" fill="#fff6d5" stroke-width=".26458"/><path d="m6.6146 157.43v-9.2604" fill="none" marker-end="url(#a)" stroke-width=".26458px"/><path d="m6.6146 142.88v-9.2604" fill="none" marker-end="url(#Arrow1Mend)" stroke-width=".26458px"/></g></g></svg>
diff --git a/src/spdk/doc/img/lvol_inflate_clone_snapshot.svg b/src/spdk/doc/img/lvol_inflate_clone_snapshot.svg
new file mode 100644
index 00000000..85c85b4e
--- /dev/null
+++ b/src/spdk/doc/img/lvol_inflate_clone_snapshot.svg
@@ -0,0 +1,3 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+<svg width="169.33mm" height="89.958mm" version="1.1" viewBox="0 0 169.33 89.958" xmlns="http://www.w3.org/2000/svg" xmlns:cc="http://creativecommons.org/ns#" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"><defs><marker id="h" overflow="visible" orient="auto"><path transform="matrix(-.4 0 0 -.4 -4 0)" d="m0 0 5-5-17.5 5 17.5 5z" fill-rule="evenodd" stroke="#000" stroke-width="1pt"/></marker><marker id="i" overflow="visible" orient="auto"><path transform="matrix(-.4 0 0 -.4 -4 0)" d="m0 0 5-5-17.5 5 17.5 5z" fill-rule="evenodd" stroke="#000" stroke-width="1pt"/></marker><marker id="Arrow1Mend" overflow="visible" orient="auto"><path transform="matrix(-.4 0 0 -.4 -4 0)" d="m0 0 5-5-17.5 5 17.5 5z" fill-rule="evenodd" stroke="#000" stroke-width="1pt"/></marker><marker id="e" overflow="visible" orient="auto"><path transform="matrix(.4 0 0 .4 4 0)" d="m0 0 5-5-17.5 5 17.5 5z" fill="#00f" fill-rule="evenodd" stroke="#00f" stroke-width="1pt"/></marker><marker id="g" overflow="visible" orient="auto"><path transform="matrix(.4 0 0 .4 4 0)" d="m0 0 5-5-17.5 5 17.5 5z" fill="#00f" fill-rule="evenodd" stroke="#00f" stroke-width="1pt"/></marker><marker id="Arrow1Mstart" overflow="visible" orient="auto"><path transform="matrix(.4 0 0 .4 4 0)" d="m0 0 5-5-17.5 5 17.5 5z" fill="#00f" fill-rule="evenodd" stroke="#00f" stroke-width="1pt"/></marker><marker id="j" overflow="visible" orient="auto"><path transform="matrix(.4 0 0 .4 4 0)" d="m0 0 5-5-17.5 5 17.5 5z" fill="#00f" fill-rule="evenodd" stroke="#00f" stroke-width="1pt"/></marker><marker id="f" overflow="visible" orient="auto"><path transform="matrix(.4 0 0 .4 4 0)" d="m0 0 5-5-17.5 5 17.5 5z" fill="#00f" fill-rule="evenodd" stroke="#00f" stroke-width="1pt"/></marker><marker id="a" overflow="visible" orient="auto"><path transform="matrix(.4 0 0 .4 4 0)" d="m0 0 5-5-17.5 5 17.5 5z" fill="#00f" fill-rule="evenodd" stroke="#00f" stroke-width="1pt"/></marker><marker id="d" overflow="visible" orient="auto"><path transform="matrix(.4 0 0 .4 4 0)" d="m0 0 5-5-17.5 5 17.5 5z" fill="#00f" fill-rule="evenodd" stroke="#00f" stroke-width="1pt"/></marker><marker id="b" overflow="visible" orient="auto"><path transform="matrix(.4 0 0 .4 4 0)" d="m0 0 5-5-17.5 5 17.5 5z" fill="#00f" fill-rule="evenodd" stroke="#00f" stroke-width="1pt"/></marker><marker id="c" overflow="visible" orient="auto"><path transform="matrix(.4 0 0 .4 4 0)" d="m0 0 5-5-17.5 5 17.5 5z" fill="#00f" fill-rule="evenodd" stroke="#00f" stroke-width="1pt"/></marker></defs><metadata><rdf:RDF><cc:Work rdf:about=""><dc:format>image/svg+xml</dc:format><dc:type rdf:resource="http://purl.org/dc/dcmitype/StillImage"/><dc:title/></cc:Work></rdf:RDF></metadata><g transform="translate(3.9687 2.5133)"><rect x="-3.9687" y="-2.5133" width="169.33" height="89.958" fill="#fff"/></g><g transform="translate(-37.042 -17.865)"><g stroke="#000" stroke-width=".26458"><rect transform="scale(1,-1)" x="66.146" y="-56.229" width="22.49" height="6.6146" fill="none" stroke-dasharray="0.52916663, 0.52916663"/><rect transform="scale(1,-1)" x="88.635" y="-56.229" width="22.49" height="6.6146" fill="#d7d7f4"/><rect transform="scale(1,-1)" x="111.13" y="-56.229" width="22.49" height="6.6146" fill="#d7d7f4"/><rect transform="scale(1,-1)" x="133.61" y="-56.229" width="22.49" height="6.6146" fill="none" stroke-dasharray="0.52916663, 0.52916663"/><rect transform="scale(1,-1)" x="156.1" y="-56.229" width="22.49" height="6.6146" fill="none" stroke-dasharray="0.52916663, 0.52916663"/><rect transform="scale(1,-1)" x="178.59" y="-56.229" width="22.49" height="6.6146" fill="#d7d7f4"/></g><g fill="#d7f4d7" stroke="#000" stroke-width=".26458"><rect transform="scale(1,-1)" x="111.13" y="-41.677" width="22.49" height="6.6146"/><rect transform="scale(1,-1)" x="133.61" y="-41.677" width="22.49" height="6.6146"/><rect transform="scale(1,-1)" x="156.1" y="-41.677" width="22.49" height="6.6146"/><rect transform="scale(1,-1)" x="178.59" y="-41.677" width="22.49" height="6.6146"/></g><text x="39.850315" y="38.377769" fill="#000000" font-family="sans-serif" font-size="3.5278px" letter-spacing="0px" stroke-width=".26458" word-spacing="0px" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal;line-height:1.25" xml:space="preserve"><tspan x="39.850315" y="38.377769" stroke-width=".26458">snapshot</tspan></text><text x="39.348198" y="97.549011" fill="#000000" font-family="sans-serif" font-size="3.5278px" letter-spacing="0px" stroke-width=".26458" word-spacing="0px" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal;line-height:1.25" xml:space="preserve"><tspan x="39.348198" y="97.549011">Inflated</tspan><tspan x="39.348198" y="101.95873">clone</tspan></text><g stroke="#000"><path d="m39.688 64.167 161.4 9e-6" fill="none" stroke-dasharray="1.59000006, 1.59000006" stroke-width=".265"/><g stroke-width=".26458"><rect transform="scale(1,-1)" x="66.146" y="-102.53" width="22.49" height="6.6146" fill="#f4d7d7"/><rect transform="scale(1,-1)" x="133.61" y="-102.53" width="22.49" height="6.6146" fill="#d7f4d7"/><rect transform="scale(1,-1)" x="156.1" y="-102.53" width="22.49" height="6.6146" fill="#d7f4d7"/></g></g><g fill="#d7d7f4" stroke="#000" stroke-width=".26458"><rect transform="scale(1,-1)" x="88.635" y="-102.53" width="22.49" height="6.6146"/><rect transform="scale(1,-1)" x="111.13" y="-102.53" width="22.49" height="6.6146"/><rect transform="scale(1,-1)" x="178.59" y="-102.53" width="22.49" height="6.6146"/></g><text x="39.821827" y="53.033295" fill="#000000" font-family="sans-serif" font-size="3.5278px" letter-spacing="0px" stroke-width=".26458" word-spacing="0px" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal;line-height:1.25" xml:space="preserve"><tspan x="39.821827" y="53.033295" stroke-width=".26458">clone</tspan></text><rect transform="scale(1,-1)" x="66.146" y="-27.125" width="22.49" height="6.6146" fill="#f4d7d7" stroke="#000" stroke-dasharray="0.52999997, 0.26499999" stroke-width=".265"/><text x="77.57962" y="25.063118" fill="#000000" font-family="sans-serif" font-size="10.583px" letter-spacing="0px" stroke-width=".26458" word-spacing="0px" style="line-height:1.25" xml:space="preserve"><tspan x="77.57962" y="25.063118" font-family="sans-serif" font-size="3.5278px" stroke-width=".26458" text-align="center" text-anchor="middle" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal">00000...</tspan></text><rect transform="scale(1,-1)" x="88.635" y="-27.125" width="22.49" height="6.6146" fill="#f4d7d7" stroke="#000" stroke-dasharray="0.52999997, 0.26499999" stroke-width=".265"/><text x="100.06921" y="25.063118" fill="#000000" font-family="sans-serif" font-size="10.583px" letter-spacing="0px" stroke-width=".26458" word-spacing="0px" style="line-height:1.25" xml:space="preserve"><tspan x="100.06921" y="25.063118" font-family="sans-serif" font-size="3.5278px" stroke-width=".26458" text-align="center" text-anchor="middle" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal">00000...</tspan></text><rect transform="scale(1,-1)" x="111.13" y="-27.125" width="22.49" height="6.6146" fill="#f4d7d7" stroke="#000" stroke-dasharray="0.52999997, 0.26499999" stroke-width=".265"/><text x="122.55879" y="25.063118" fill="#000000" font-family="sans-serif" font-size="10.583px" letter-spacing="0px" stroke-width=".26458" word-spacing="0px" style="line-height:1.25" xml:space="preserve"><tspan x="122.55879" y="25.063118" font-family="sans-serif" font-size="3.5278px" stroke-width=".26458" text-align="center" text-anchor="middle" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal">00000...</tspan></text><rect transform="scale(1,-1)" x="133.61" y="-27.125" width="22.49" height="6.6146" fill="#f4d7d7" stroke="#000" stroke-dasharray="0.52999997, 0.26499999" stroke-width=".265"/><text x="145.04839" y="25.063118" fill="#000000" font-family="sans-serif" font-size="10.583px" letter-spacing="0px" stroke-width=".26458" word-spacing="0px" style="line-height:1.25" xml:space="preserve"><tspan x="145.04839" y="25.063118" font-family="sans-serif" font-size="3.5278px" stroke-width=".26458" text-align="center" text-anchor="middle" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal">00000...</tspan></text><rect transform="scale(1,-1)" x="156.1" y="-27.125" width="22.49" height="6.6146" fill="#f4d7d7" stroke="#000" stroke-dasharray="0.52999997, 0.26499999" stroke-width=".265"/><text x="167.53796" y="25.063118" fill="#000000" font-family="sans-serif" font-size="10.583px" letter-spacing="0px" stroke-width=".26458" word-spacing="0px" style="line-height:1.25" xml:space="preserve"><tspan x="167.53796" y="25.063118" font-family="sans-serif" font-size="3.5278px" stroke-width=".26458" text-align="center" text-anchor="middle" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal">00000...</tspan></text><rect transform="scale(1,-1)" x="178.59" y="-27.125" width="22.49" height="6.6146" fill="#f4d7d7" stroke="#000" stroke-dasharray="0.53, 0.265" stroke-width=".265"/><text x="190.02751" y="25.063118" fill="#000000" font-family="sans-serif" font-size="10.583px" letter-spacing="0px" stroke-width=".26458" word-spacing="0px" style="line-height:1.25" xml:space="preserve"><tspan x="190.02751" y="25.063118" font-family="sans-serif" font-size="3.5278px" stroke-width=".26458" text-align="center" text-anchor="middle" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal">00000...</tspan></text><text x="39.850307" y="23.727493" fill="#000000" font-family="sans-serif" font-size="3.5278px" letter-spacing="0px" stroke-width=".26458" word-spacing="0px" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal;line-height:1.25" xml:space="preserve"><tspan x="39.850307" y="23.727493" stroke-width=".26458">zeroes_dev</tspan></text><g fill="none" stroke="#000"><rect transform="scale(1,-1)" x="66.146" y="-41.677" width="22.49" height="6.6146" stroke-dasharray="0.52916663, 0.52916663" stroke-width=".26458"/><rect transform="scale(1,-1)" x="88.635" y="-41.677" width="22.49" height="6.6146" stroke-dasharray="0.52916663, 0.52916663" stroke-width=".26458"/><rect x="66.146" y="72.104" width="134.94" height="7.9375" ry="2.6458" stroke-width=".5"/></g><text x="113.74464" y="77.262192" fill="#000000" font-family="sans-serif" font-size="3.5278px" letter-spacing="0px" stroke-width=".26458" word-spacing="0px" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal;line-height:1.25" xml:space="preserve"><tspan x="113.74464" y="77.262192" stroke-width=".26458">Allocate and copy</tspan></text><g fill="none" stroke-width=".265"><path d="m39.688 87.979 161.4 4e-6" stroke="#000" stroke-dasharray="1.59000008, 1.59000008"/><g stroke="#808080"><rect x="58.208" y="32.417" width="145.52" height="11.906" ry="1.3229"/><rect x="58.208" y="46.969" width="145.52" height="11.906" ry="1.3229"/><rect x="58.208" y="93.271" width="145.52" height="11.906" ry="1.3229"/></g></g><g fill="#00f" stroke="#00f" stroke-width=".265"><path d="m76.729 72.104v-44.979" marker-start="url(#e)"/><path d="m145.52 72.104v-30.427" marker-start="url(#g)"/><path d="m168.01 72.104v-30.427" marker-start="url(#Arrow1Mstart)"/><path d="m76.729 95.917 1.4e-5 -15.875" marker-start="url(#a)"/><path d="m145.52 95.917v-15.875" marker-start="url(#f)"/><path d="m168.01 95.917 1e-5 -15.875" marker-start="url(#j)"/></g><path d="m58.208 53.583c-7.4527 13.662-6.6489 28.799 0 44.979" fill="none" marker-end="url(#Arrow1Mend)" stroke="#000" stroke-width=".5"/><g fill="#00f" stroke="#00f" stroke-width=".265"><path d="m100.54 95.917v-39.688" marker-start="url(#d)" stroke-dasharray="1.58999992, 1.58999992"/><path d="m123.03 95.917v-39.688" marker-start="url(#b)" stroke-dasharray="1.58999994, 1.58999994"/><path d="m190.5 95.917v-39.688" marker-start="url(#c)" stroke-dasharray="1.58999994, 1.58999994"/></g><text x="39.498512" y="77.301338" fill="#000000" font-family="sans-serif" font-size="3.5278px" letter-spacing="0px" stroke-width=".26458" word-spacing="0px" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal;line-height:1.25" xml:space="preserve"><tspan x="39.498512" y="77.301338" stroke-width=".26458">Inflate</tspan></text><path d="m44.979 24.479v10.583" fill="none" marker-end="url(#h)" stroke="#000" stroke-width=".26458px"/><path d="m44.979 40.354v7.9375" fill="none" marker-end="url(#i)" stroke="#000" stroke-width=".26458px"/></g></svg>
diff --git a/src/spdk/doc/img/lvol_thin_provisioning.svg b/src/spdk/doc/img/lvol_thin_provisioning.svg
new file mode 100644
index 00000000..1d95d1b0
--- /dev/null
+++ b/src/spdk/doc/img/lvol_thin_provisioning.svg
@@ -0,0 +1,3 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+<svg width="181.24mm" height="79.375mm" version="1.1" viewBox="0 0 181.24 79.375" xmlns="http://www.w3.org/2000/svg" xmlns:cc="http://creativecommons.org/ns#" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"><title>Thin Provisioning</title><defs><marker id="marker2036" overflow="visible" orient="auto"><path transform="matrix(-.4 0 0 -.4 -4 0)" d="m0 0 5-5-17.5 5 17.5 5z" fill-rule="evenodd" stroke="#000" stroke-width="1pt"/></marker><marker id="marker1960" overflow="visible" orient="auto"><path transform="matrix(-.4 0 0 -.4 -4 0)" d="m0 0 5-5-17.5 5 17.5 5z" fill-rule="evenodd" stroke="#000" stroke-width="1pt"/></marker><marker id="marker1890" overflow="visible" orient="auto"><path transform="matrix(-.4 0 0 -.4 -4 0)" d="m0 0 5-5-17.5 5 17.5 5z" fill-rule="evenodd" stroke="#000" stroke-width="1pt"/></marker><marker id="marker1826" overflow="visible" orient="auto"><path transform="matrix(-.4 0 0 -.4 -4 0)" d="m0 0 5-5-17.5 5 17.5 5z" fill-rule="evenodd" stroke="#000" stroke-width="1pt"/></marker><marker id="marker1816" overflow="visible" orient="auto"><path transform="matrix(-.4 0 0 -.4 -4 0)" d="m0 0 5-5-17.5 5 17.5 5z" fill-rule="evenodd" stroke="#000" stroke-width="1pt"/></marker><marker id="Arrow1Mend" overflow="visible" orient="auto"><path transform="matrix(-.4 0 0 -.4 -4 0)" d="m0 0 5-5-17.5 5 17.5 5z" fill-rule="evenodd" stroke="#000" stroke-width="1pt"/></marker><marker id="marker11771-4-9" overflow="visible" orient="auto"><path transform="matrix(-.4 0 0 -.4 -4 0)" d="m0 0 5-5-17.5 5 17.5 5z" fill="#f00" fill-rule="evenodd" stroke="#ff2a2a" stroke-width="1pt"/></marker><marker id="marker1826-2-4-7-1-7" overflow="visible" orient="auto"><path transform="matrix(-.4 0 0 -.4 -4 0)" d="m0 0 5-5-17.5 5 17.5 5z" fill="#00f" fill-rule="evenodd" stroke="#00f" stroke-width="1pt"/></marker></defs><metadata><rdf:RDF><cc:Work rdf:about=""><dc:format>image/svg+xml</dc:format><dc:type rdf:resource="http://purl.org/dc/dcmitype/StillImage"/><dc:title>Thin Provisioning</dc:title></cc:Work></rdf:RDF></metadata><g transform="translate(2.6458 2.3956)"><rect x="-2.6458" y="-2.3956" width="181.24" height="79.375" fill="#fffffe" stroke-width=".26458"/></g><g transform="translate(-3.9688 -4.6356)"><g stroke="#000"><g stroke-width=".26458"><rect x="44.979" y="32.417" width="22.49" height="6.6146" fill="none" stroke-dasharray="0.52916663, 0.52916663"/><rect x="67.469" y="32.417" width="22.49" height="6.6146" fill="#d7d7f4"/><rect x="89.958" y="32.417" width="22.49" height="6.6146" fill="#d7d7f4"/><rect x="112.45" y="32.417" width="22.49" height="6.6146" fill="none" stroke-dasharray="0.52916663, 0.52916663"/><rect x="134.94" y="32.417" width="22.49" height="6.6146" fill="none" stroke-dasharray="0.52916663, 0.52916663"/><rect x="157.43" y="32.417" width="22.49" height="6.6146" fill="#d7d7f4"/></g><rect x="44.979" y="46.969" width="22.49" height="6.6146" fill="#f4d7d7" stroke-dasharray="0.52999997, 0.26499999" stroke-width=".265"/></g><text x="56.412949" y="51.598957" fill="#000000" font-family="sans-serif" font-size="10.583px" letter-spacing="0px" stroke-width=".26458" word-spacing="0px" style="line-height:1.25" xml:space="preserve"><tspan x="56.412949" y="51.598957" font-family="sans-serif" font-size="3.5278px" stroke-width=".26458" text-align="center" text-anchor="middle" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal">00000...</tspan></text><rect x="67.469" y="46.969" width="22.49" height="6.6146" fill="#f4d7d7" stroke="#000" stroke-dasharray="0.52999997, 0.26499999" stroke-width=".265"/><text x="78.902527" y="51.598961" fill="#000000" font-family="sans-serif" font-size="10.583px" letter-spacing="0px" stroke-width=".26458" word-spacing="0px" style="line-height:1.25" xml:space="preserve"><tspan x="78.902527" y="51.598961" font-family="sans-serif" font-size="3.5278px" stroke-width=".26458" text-align="center" text-anchor="middle" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal">00000...</tspan></text><rect x="89.958" y="46.969" width="22.49" height="6.6146" fill="#f4d7d7" stroke="#000" stroke-dasharray="0.52999997, 0.26499999" stroke-width=".265"/><text x="101.39211" y="51.598961" fill="#000000" font-family="sans-serif" font-size="10.583px" letter-spacing="0px" stroke-width=".26458" word-spacing="0px" style="line-height:1.25" xml:space="preserve"><tspan x="101.39211" y="51.598961" font-family="sans-serif" font-size="3.5278px" stroke-width=".26458" text-align="center" text-anchor="middle" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal">00000...</tspan></text><rect x="112.45" y="46.969" width="22.49" height="6.6146" fill="#f4d7d7" stroke="#000" stroke-dasharray="0.52999997, 0.26499999" stroke-width=".265"/><text x="123.88169" y="51.598961" fill="#000000" font-family="sans-serif" font-size="10.583px" letter-spacing="0px" stroke-width=".26458" word-spacing="0px" style="line-height:1.25" xml:space="preserve"><tspan x="123.88169" y="51.598961" font-family="sans-serif" font-size="3.5278px" stroke-width=".26458" text-align="center" text-anchor="middle" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal">00000...</tspan></text><rect x="134.94" y="46.969" width="22.49" height="6.6146" fill="#f4d7d7" stroke="#000" stroke-dasharray="0.52999997, 0.26499999" stroke-width=".265"/><text x="146.37128" y="51.598957" fill="#000000" font-family="sans-serif" font-size="10.583px" letter-spacing="0px" stroke-width=".26458" word-spacing="0px" style="line-height:1.25" xml:space="preserve"><tspan x="146.37128" y="51.598957" font-family="sans-serif" font-size="3.5278px" stroke-width=".26458" text-align="center" text-anchor="middle" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal">00000...</tspan></text><rect x="157.43" y="46.969" width="22.49" height="6.6146" fill="#f4d7d7" stroke="#000" stroke-dasharray="0.52999997, 0.26499999" stroke-width=".265"/><g font-family="sans-serif" letter-spacing="0px" stroke-width=".26458" word-spacing="0px"><text x="168.86086" y="51.598961" font-size="10.583px" style="line-height:1.25" xml:space="preserve"><tspan x="168.86086" y="51.598961" font-family="sans-serif" font-size="3.5278px" stroke-width=".26458" text-align="center" text-anchor="middle" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal">00000...</tspan></text><text x="6.6430736" y="51.680019" font-size="3.5278px" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal;line-height:1.25" xml:space="preserve"><tspan x="6.6430736" y="51.680019" stroke-width=".26458">zeroes_dev</tspan></text><text x="6.6296382" y="12.539818" font-size="3.5278px" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal;line-height:1.25" xml:space="preserve"><tspan x="6.6296382" y="12.539818">Thin-provisioned</tspan><tspan x="6.6296382" y="16.949539">volume</tspan></text></g><g stroke="#000"><path d="m6.6146 24.479 173.3 1e-6" fill="none" stroke-dasharray="1.59, 1.59" stroke-width=".265"/><g fill="#f4d7d7" stroke-dasharray="0.52916663, 0.26458332" stroke-width=".26458"><rect x="44.979" y="9.9271" width="22.49" height="6.6146"/><rect x="112.45" y="9.9271" width="22.49" height="6.6146"/><rect x="134.94" y="9.9271" width="22.49" height="6.6146"/></g><g fill="#d7d7f4" stroke-width=".26458"><rect x="67.469" y="9.9271" width="22.49" height="6.6146"/><rect x="89.958" y="9.9271" width="22.49" height="6.6146"/><rect x="157.43" y="9.9271" width="22.49" height="6.6146"/></g></g><text x="6.614583" y="37.708332" fill="#000000" font-family="sans-serif" font-size="3.5278px" letter-spacing="0px" stroke-width=".26458" word-spacing="0px" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal;line-height:1.25" xml:space="preserve"><tspan x="6.614583" y="37.708332" stroke-width=".26458">active clusters</tspan></text><rect x="37.042" y="7.2812" width="145.52" height="11.906" ry="1.3229" fill="none" stroke="#999" stroke-width=".5"/><rect x="37.042" y="29.771" width="145.52" height="26.458" ry="1.3229" fill="none" stroke="#999" stroke-width=".5"/><g fill="#00f" stroke="#00f"><g stroke-width=".26458"><path d="m78.052 16.542v15.875" marker-end="url(#marker1960)"/><path d="m55.562 16.542v30.427" marker-end="url(#marker2036)"/><path d="m100.54 16.542v15.875" marker-end="url(#marker1890)"/><path d="m169.33 16.542v15.875" marker-end="url(#Arrow1Mend)"/><path d="m124.35 16.542v30.427" marker-end="url(#marker1826)"/><path d="m146.84 16.542v30.427" marker-end="url(#marker1816)"/></g><path d="m132.29 61.521 10.583 1e-5" marker-end="url(#marker1826-2-4-7-1-7)" stroke-width=".265"/></g><path d="m132.29 66.813h10.583" fill="#f00" marker-end="url(#marker11771-4-9)" stroke="#ff2a2a" stroke-width=".265"/><g stroke-width=".26458"><text x="145.52083" y="62.843975" fill="#000000" font-family="sans-serif" font-size="3.5278px" letter-spacing="0px" word-spacing="0px" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal;line-height:1.25" xml:space="preserve"><tspan x="145.52083" y="62.843975" font-family="sans-serif" font-size="2.8222px" stroke-width=".26458" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal">read</tspan></text><text x="145.52083" y="68.135651" fill="#000000" font-family="sans-serif" font-size="3.5278px" letter-spacing="0px" word-spacing="0px" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal;line-height:1.25" xml:space="preserve"><tspan x="145.52083" y="68.135651" font-family="sans-serif" font-size="2.8222px" stroke-width=".26458" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal">allocate and copy cluster</tspan></text><rect x="132.29" y="70.781" width="10.583" height="2.6458" fill="none" stroke="#000" stroke-dasharray="0.52916664, 0.52916664"/><text x="145.52083" y="73.427307" fill="#000000" font-family="sans-serif" font-size="3.5278px" letter-spacing="0px" word-spacing="0px" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal;line-height:1.25" xml:space="preserve"><tspan x="145.52083" y="73.427307" font-family="sans-serif" font-size="2.8222px" stroke-width=".26458" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal">unallocated cluster</tspan></text></g><rect x="132.29" y="76.073" width="10.583" height="2.6458" fill="none" stroke="#000" stroke-width=".265"/><text x="145.52083" y="78.718971" fill="#000000" font-family="sans-serif" font-size="3.5278px" letter-spacing="0px" stroke-width=".26458" word-spacing="0px" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal;line-height:1.25" xml:space="preserve"><tspan x="145.52083" y="78.718971" font-family="sans-serif" font-size="2.8222px" stroke-width=".26458" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal">allocated cluster</tspan></text></g></svg>
diff --git a/src/spdk/doc/img/lvol_thin_provisioning_write.svg b/src/spdk/doc/img/lvol_thin_provisioning_write.svg
new file mode 100644
index 00000000..37cf6af9
--- /dev/null
+++ b/src/spdk/doc/img/lvol_thin_provisioning_write.svg
@@ -0,0 +1,3 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+<svg width="181.24mm" height="79.375mm" version="1.1" viewBox="0 0 181.24 79.375" xmlns="http://www.w3.org/2000/svg" xmlns:cc="http://creativecommons.org/ns#" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"><title>Thin Provisioning Write</title><defs><marker id="marker11771-4-9" overflow="visible" orient="auto"><path transform="matrix(-.4 0 0 -.4 -4 0)" d="m0 0 5-5-17.5 5 17.5 5z" fill="#f00" fill-rule="evenodd" stroke="#ff2a2a" stroke-width="1pt"/></marker><marker id="marker1826-2-4-7-1-7" overflow="visible" orient="auto"><path transform="matrix(-.4 0 0 -.4 -4 0)" d="m0 0 5-5-17.5 5 17.5 5z" fill="#00f" fill-rule="evenodd" stroke="#00f" stroke-width="1pt"/></marker><marker id="marker11771-4-9-6" overflow="visible" orient="auto"><path transform="matrix(-.4 0 0 -.4 -4 0)" d="m0 0 5-5-17.5 5 17.5 5z" fill="#f00" fill-rule="evenodd" stroke="#ff2a2a" stroke-width="1pt"/></marker><marker id="marker1826-2-4-7-1-7-4" overflow="visible" orient="auto"><path transform="matrix(-.4 0 0 -.4 -4 0)" d="m0 0 5-5-17.5 5 17.5 5z" fill="#00f" fill-rule="evenodd" stroke="#00f" stroke-width="1pt"/></marker><marker id="marker1826-2-4-7-1-7-4-1" overflow="visible" orient="auto"><path transform="matrix(-.4 0 0 -.4 -4 0)" d="m0 0 5-5-17.5 5 17.5 5z" fill="#00f" fill-rule="evenodd" stroke="#00f" stroke-width="1pt"/></marker></defs><metadata><rdf:RDF><cc:Work rdf:about=""><dc:format>image/svg+xml</dc:format><dc:type rdf:resource="http://purl.org/dc/dcmitype/StillImage"/><dc:title>Thin Provisioning Write</dc:title></cc:Work></rdf:RDF></metadata><g transform="translate(2.6458 2.3956)"><rect x="-2.6458" y="-2.3956" width="181.24" height="79.375" fill="#fffffe" stroke-width=".26458"/></g><g transform="translate(-3.9688 -4.6356)"><g stroke="#000"><rect x="44.979" y="32.417" width="22.49" height="6.6146" fill="none" stroke-dasharray="0.52916663, 0.52916663" stroke-width=".26458"/><rect x="67.469" y="32.417" width="22.49" height="6.6146" fill="#ffe3be" stroke-dasharray="0.52916663, 0.52916663" stroke-width=".26458"/><g stroke-width=".26458"><rect x="112.45" y="32.417" width="22.49" height="6.6146" fill="#fff6d5"/><rect x="89.959" y="32.417" width="22.49" height="6.6146" fill="none" stroke-dasharray="0.52916663, 0.52916663"/><rect x="134.94" y="32.417" width="22.49" height="6.6146" fill="none" stroke-dasharray="0.52916663, 0.52916663"/></g><rect x="44.979" y="46.969" width="22.49" height="6.6146" fill="#f4d7d7" stroke-dasharray="0.52999997, 0.26499999" stroke-width=".265"/></g><text x="56.412949" y="51.598957" fill="#000000" font-family="sans-serif" font-size="10.583px" letter-spacing="0px" stroke-width=".26458" word-spacing="0px" style="line-height:1.25" xml:space="preserve"><tspan x="56.412949" y="51.598957" font-family="sans-serif" font-size="3.5278px" stroke-width=".26458" text-align="center" text-anchor="middle" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal">00000...</tspan></text><rect x="67.469" y="46.969" width="22.49" height="6.6146" fill="#f4d7d7" stroke="#000" stroke-dasharray="0.52999997, 0.26499999" stroke-width=".265"/><text x="78.902527" y="51.598961" fill="#000000" font-family="sans-serif" font-size="10.583px" letter-spacing="0px" stroke-width=".26458" word-spacing="0px" style="line-height:1.25" xml:space="preserve"><tspan x="78.902527" y="51.598961" font-family="sans-serif" font-size="3.5278px" stroke-width=".26458" text-align="center" text-anchor="middle" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal">00000...</tspan></text><rect x="89.958" y="46.969" width="22.49" height="6.6146" fill="#f4d7d7" stroke="#000" stroke-dasharray="0.52999997, 0.26499999" stroke-width=".265"/><text x="101.39211" y="51.598961" fill="#000000" font-family="sans-serif" font-size="10.583px" letter-spacing="0px" stroke-width=".26458" word-spacing="0px" style="line-height:1.25" xml:space="preserve"><tspan x="101.39211" y="51.598961" font-family="sans-serif" font-size="3.5278px" stroke-width=".26458" text-align="center" text-anchor="middle" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal">00000...</tspan></text><rect x="112.45" y="46.969" width="22.49" height="6.6146" fill="#f4d7d7" stroke="#000" stroke-dasharray="0.52999997, 0.26499999" stroke-width=".265"/><text x="123.88169" y="51.598961" fill="#000000" font-family="sans-serif" font-size="10.583px" letter-spacing="0px" stroke-width=".26458" word-spacing="0px" style="line-height:1.25" xml:space="preserve"><tspan x="123.88169" y="51.598961" font-family="sans-serif" font-size="3.5278px" stroke-width=".26458" text-align="center" text-anchor="middle" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal">00000...</tspan></text><rect x="134.94" y="46.969" width="22.49" height="6.6146" fill="#f4d7d7" stroke="#000" stroke-dasharray="0.52999997, 0.26499999" stroke-width=".265"/><text x="146.37128" y="51.598957" fill="#000000" font-family="sans-serif" font-size="10.583px" letter-spacing="0px" stroke-width=".26458" word-spacing="0px" style="line-height:1.25" xml:space="preserve"><tspan x="146.37128" y="51.598957" font-family="sans-serif" font-size="3.5278px" stroke-width=".26458" text-align="center" text-anchor="middle" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal">00000...</tspan></text><rect x="157.43" y="46.969" width="22.49" height="6.6146" fill="#f4d7d7" stroke="#000" stroke-dasharray="0.52999997, 0.26499999" stroke-width=".265"/><g font-family="sans-serif" letter-spacing="0px" stroke-width=".26458" word-spacing="0px"><text x="168.86086" y="51.598961" font-size="10.583px" style="line-height:1.25" xml:space="preserve"><tspan x="168.86086" y="51.598961" font-family="sans-serif" font-size="3.5278px" stroke-width=".26458" text-align="center" text-anchor="middle" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal">00000...</tspan></text><text x="6.6430736" y="51.680019" font-size="3.5278px" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal;line-height:1.25" xml:space="preserve"><tspan x="6.6430736" y="51.680019" stroke-width=".26458">zeroes_dev</tspan></text><text x="6.6296382" y="12.539818" font-size="3.5278px" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal;line-height:1.25" xml:space="preserve">write</text></g><g stroke="#000"><path d="m6.6146 24.479 173.3 1e-6" fill="none" stroke-dasharray="1.59, 1.59" stroke-width=".265"/><rect x="67.469" y="9.9271" width="22.49" height="6.6146" fill="#fff6d5" stroke-width=".26458"/><rect x="112.45" y="9.927" width="22.49" height="6.6146" fill="#fff6d5" stroke-width=".26458"/></g><text x="6.614583" y="37.708332" fill="#000000" font-family="sans-serif" font-size="3.5278px" letter-spacing="0px" stroke-width=".26458" word-spacing="0px" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal;line-height:1.25" xml:space="preserve"><tspan x="6.614583" y="37.708332" stroke-width=".26458">active clusters</tspan></text><rect x="37.042" y="29.771" width="145.52" height="26.458" ry="1.3229" fill="none" stroke="#999" stroke-width=".5"/><path d="m121.71 61.521 10.583 1e-5" fill="#00f" marker-end="url(#marker1826-2-4-7-1-7)" stroke="#00f" stroke-width=".265"/><path d="m121.71 66.813h10.583" fill="#f00" marker-end="url(#marker11771-4-9)" stroke="#ff2a2a" stroke-width=".265"/><g stroke-width=".26458"><text x="134.93752" y="62.843967" fill="#000000" font-family="sans-serif" font-size="3.5278px" letter-spacing="0px" word-spacing="0px" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal;line-height:1.25" xml:space="preserve"><tspan x="134.93752" y="62.843967" font-family="sans-serif" font-size="2.8222px" stroke-width=".26458" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal">write</tspan></text><text x="134.93752" y="68.135635" fill="#000000" font-family="sans-serif" font-size="3.5278px" letter-spacing="0px" word-spacing="0px" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal;line-height:1.25" xml:space="preserve"><tspan x="134.93752" y="68.135635" font-family="sans-serif" font-size="2.8222px" stroke-width=".26458" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal">allocate and copy cluster</tspan></text><rect x="121.71" y="70.781" width="10.583" height="2.6458" fill="none" stroke="#000" stroke-dasharray="0.52916663, 0.52916663"/><text x="134.93752" y="73.427292" fill="#000000" font-family="sans-serif" font-size="3.5278px" letter-spacing="0px" word-spacing="0px" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal;line-height:1.25" xml:space="preserve"><tspan x="134.93752" y="73.427292" font-family="sans-serif" font-size="2.8222px" stroke-width=".26458" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal">unallocated cluster before write</tspan></text></g><rect x="121.71" y="76.073" width="10.583" height="2.6458" fill="none" stroke="#000" stroke-width=".265"/><text x="134.93752" y="78.718956" fill="#000000" font-family="sans-serif" font-size="3.5278px" letter-spacing="0px" stroke-width=".26458" word-spacing="0px" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal;line-height:1.25" xml:space="preserve"><tspan x="134.93752" y="78.718956" font-family="sans-serif" font-size="2.8222px" stroke-width=".26458" style="font-feature-settings:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal">allocated cluster</tspan></text><rect x="157.43" y="32.417" width="22.49" height="6.6146" fill="none" stroke="#000" stroke-dasharray="0.52916664, 0.52916664" stroke-width=".26458"/><path d="m72.76 46.969 7e-6 -7.9375" fill="#f00" marker-end="url(#marker11771-4-9-6)" stroke="#ff2a2a" stroke-width=".265"/></g><path d="m79.375 11.906v15.875" fill="#00f" marker-end="url(#marker1826-2-4-7-1-7-4)" stroke="#00f" stroke-width=".265"/><path d="m119.06 11.906v15.875" fill="#00f" marker-end="url(#marker1826-2-4-7-1-7-4-1)" stroke="#00f" stroke-width=".265"/></svg>
diff --git a/src/spdk/doc/img/qemu_vhost_data_flow.svg b/src/spdk/doc/img/qemu_vhost_data_flow.svg
new file mode 100644
index 00000000..96b4673e
--- /dev/null
+++ b/src/spdk/doc/img/qemu_vhost_data_flow.svg
@@ -0,0 +1,2 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg version="1.1" viewBox="0 0 187.85 104.34" xmlns="http://www.w3.org/2000/svg" xmlns:cc="http://creativecommons.org/ns#" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"><defs><marker id="a" style="overflow:visible" orient="auto"><path transform="matrix(1.1,0,0,1.1,1.1,0)" d="m8.7186 4.0337-10.926-4.0177 10.926-4.0177c-1.7455 2.3721-1.7354 5.6175-6e-7 8.0354z" style="fill-rule:evenodd;fill:#000000;stroke-linejoin:round;stroke-width:.625;stroke:#000000"/></marker><marker id="b" style="overflow:visible" orient="auto"><path transform="matrix(-1.1,0,0,-1.1,-1.1,0)" d="m8.7186 4.0337-10.926-4.0177 10.926-4.0177c-1.7455 2.3721-1.7354 5.6175-6e-7 8.0354z" style="fill-rule:evenodd;fill:#000000;stroke-linejoin:round;stroke-width:.625;stroke:#000000"/></marker><marker id="j" style="overflow:visible" orient="auto"><path transform="matrix(1.1,0,0,1.1,1.1,0)" d="m8.7186 4.0337-10.926-4.0177 10.926-4.0177c-1.7455 2.3721-1.7354 5.6175-6e-7 8.0354z" style="fill-rule:evenodd;fill:#000000;stroke-linejoin:round;stroke-width:.625;stroke:#000000"/></marker><marker id="l" style="overflow:visible" orient="auto"><path transform="matrix(1.1,0,0,1.1,1.1,0)" d="m8.7186 4.0337-10.926-4.0177 10.926-4.0177c-1.7455 2.3721-1.7354 5.6175-6e-7 8.0354z" style="fill-rule:evenodd;fill:#000000;stroke-linejoin:round;stroke-width:.625;stroke:#000000"/></marker><marker id="c" style="overflow:visible" orient="auto"><path transform="matrix(-1.1,0,0,-1.1,-1.1,0)" d="m8.7186 4.0337-10.926-4.0177 10.926-4.0177c-1.7455 2.3721-1.7354 5.6175-6e-7 8.0354z" style="fill-rule:evenodd;fill:#000000;stroke-linejoin:round;stroke-width:.625;stroke:#000000"/></marker><marker id="d" style="overflow:visible" orient="auto"><path transform="matrix(-1.1,0,0,-1.1,-1.1,0)" d="m8.7186 4.0337-10.926-4.0177 10.926-4.0177c-1.7455 2.3721-1.7354 5.6175-6e-7 8.0354z" style="fill-rule:evenodd;fill:#000000;stroke-linejoin:round;stroke-width:.625;stroke:#000000"/></marker><marker id="e" style="overflow:visible" orient="auto"><path transform="matrix(-1.1,0,0,-1.1,-1.1,0)" d="m8.7186 4.0337-10.926-4.0177 10.926-4.0177c-1.7455 2.3721-1.7354 5.6175-6e-7 8.0354z" style="fill-rule:evenodd;fill:#000000;stroke-linejoin:round;stroke-width:.625;stroke:#000000"/></marker><marker id="f" style="overflow:visible" orient="auto"><path transform="matrix(-1.1,0,0,-1.1,-1.1,0)" d="m8.7186 4.0337-10.926-4.0177 10.926-4.0177c-1.7455 2.3721-1.7354 5.6175-6e-7 8.0354z" style="fill-rule:evenodd;fill:#000000;stroke-linejoin:round;stroke-width:.625;stroke:#000000"/></marker><marker id="g" style="overflow:visible" orient="auto"><path transform="matrix(-1.1,0,0,-1.1,-1.1,0)" d="m8.7186 4.0337-10.926-4.0177 10.926-4.0177c-1.7455 2.3721-1.7354 5.6175-6e-7 8.0354z" style="fill-rule:evenodd;fill:#000000;stroke-linejoin:round;stroke-width:.625;stroke:#000000"/></marker><marker id="h" style="overflow:visible" orient="auto"><path transform="matrix(-1.1,0,0,-1.1,-1.1,0)" d="m8.7186 4.0337-10.926-4.0177 10.926-4.0177c-1.7455 2.3721-1.7354 5.6175-6e-7 8.0354z" style="fill-rule:evenodd;fill:#000000;stroke-linejoin:round;stroke-width:.625;stroke:#000000"/></marker><marker id="i" style="overflow:visible" orient="auto"><path transform="matrix(-1.1,0,0,-1.1,-1.1,0)" d="m8.7186 4.0337-10.926-4.0177 10.926-4.0177c-1.7455 2.3721-1.7354 5.6175-6e-7 8.0354z" style="fill-rule:evenodd;fill:#000000;stroke-linejoin:round;stroke-width:.625;stroke:#000000"/></marker><marker id="k" style="overflow:visible" orient="auto"><path transform="matrix(-1.1,0,0,-1.1,-1.1,0)" d="m8.7186 4.0337-10.926-4.0177 10.926-4.0177c-1.7455 2.3721-1.7354 5.6175-6e-7 8.0354z" style="fill-rule:evenodd;fill:#000000;stroke-linejoin:round;stroke-width:.625;stroke:#000000"/></marker></defs><metadata><rdf:RDF><cc:Work rdf:about=""><dc:format>image/svg+xml</dc:format><dc:type rdf:resource="http://purl.org/dc/dcmitype/StillImage"/><dc:title/><dc:creator><cc:Agent><dc:title>Tomasz Kulasek</dc:title></cc:Agent></dc:creator></cc:Work></rdf:RDF></metadata><g transform="translate(2.5133 -10.794)"><rect x="-2.5133" y="10.794" width="187.85" height="104.34" style="fill:#fffffe"/></g><g transform="translate(-2.6458 -133.04)"><rect x="10.583" y="135.6" width="79.375" height="74.083" ry="2.6458" style="fill:#d5e5ff;stroke-width:.5;stroke:#000000"/><rect x="63.5" y="199.1" width="21.167" height="5.2917" style="fill:none;stroke-dasharray:1.05833327, 1.05833327;stroke-width:.26458;stroke:#000000"/><rect x="21.167" y="152.8" width="58.208" height="30.427" ry="2.6458" style="fill:none;stroke-width:.26458;stroke:#000000"/><path d="m26.458 191.17v-7.9375" style="fill:none;marker-end:url(#h);stroke-dasharray:1.05999995, 1.05999995;stroke-width:.265;stroke:#000000"/><path d="m34.396 183.23v7.9375" style="fill:none;marker-end:url(#i);stroke-dasharray:1.05999995, 1.05999995;stroke-width:.265;stroke:#000000"/><rect x="63.5" y="218.95" width="15.875" height="15.875" ry="2.6458" style="fill:#ffd5e5;stroke-width:.5;stroke:#000000"/><path d="m71.438 204.4v14.552" style="fill:none;marker-end:url(#g);stroke-dasharray:1.5874999, 1.5874999;stroke-width:.26458;stroke:#000000"/><rect x="15.875" y="143.54" width="68.792" height="39.687" ry="2.6458" style="fill:none;stroke-width:.26458;stroke:#000000"/><path d="m63.5 226.89h-58.208l-1e-7-62.177 10.583-1e-5" style="fill:none;marker-end:url(#f);stroke-dasharray:1.58999992, 1.58999992;stroke-width:.265;stroke:#000000"/><g transform="translate(-.13251 -.1325)"><rect x="90.091" y="135.74" width="97.896" height="52.917" ry="2.6458" style="fill:#fff6d5;stroke-width:.5;stroke:#000000"/><g><g transform="translate(-10.451 .1325)"><rect x="132.29" y="152.8" width="60.854" height="31.75" ry="2.6458" style="fill:none;stroke-width:.265;stroke:#000000"/><text x="150.91241" y="158.04379" style="fill:#000000;font-family:sans-serif;font-feature-settings:normal;font-size:3.5278px;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal;letter-spacing:0px;line-height:1.25;stroke-width:.26458;text-align:center;text-anchor:middle;word-spacing:0px" xml:space="preserve"><tspan x="150.91241" y="158.04379">Vhost-SCSI device</tspan></text></g><g transform="translate(-10.451 -2.5133)"><rect x="137.58" y="164.71" width="50.271" height="15.875" ry="2.6458" style="fill:none;stroke-opacity:.99034;stroke-width:.265;stroke:#000000"/><text x="139.99663" y="171.41422" style="fill:#000000;font-family:sans-serif;font-feature-settings:normal;font-size:3.5278px;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal;letter-spacing:0px;line-height:1.25;stroke-width:.26458;word-spacing:0px" xml:space="preserve"><tspan x="139.99663" y="171.41422" style="font-family:sans-serif;font-feature-settings:normal;font-size:3.5278px;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal">SPDK bdev(s)</tspan><tspan x="139.99663" y="175.82394" style="font-family:sans-serif;font-feature-settings:normal;font-size:2.8222px;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal">(NVMe, NVMf, Ceph RBD, PMEM)</tspan></text></g></g></g><text x="92.37162" y="140.93028" style="fill:#000000;font-family:sans-serif;font-feature-settings:normal;font-size:3.5278px;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal;letter-spacing:0px;line-height:1.25;stroke-width:.26458;word-spacing:0px" xml:space="preserve"><tspan x="92.37162" y="140.93028" style="font-family:sans-serif;font-feature-settings:normal;font-size:3.5278px;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal;stroke-width:.26458">SPDK vhost</tspan></text><text x="13.482382" y="140.44109" style="fill:#000000;font-family:sans-serif;font-feature-settings:normal;font-size:3.5278px;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal;letter-spacing:0px;line-height:1.25;stroke-width:.26458;word-spacing:0px" xml:space="preserve"><tspan x="13.482382" y="140.44109" style="font-family:sans-serif;font-feature-settings:normal;font-size:3.5278px;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal;stroke-width:.26458">QEMU</tspan></text><g transform="translate(2.5609e-6 -5.2917)"><rect x="15.875" y="196.46" width="29.104" height="13.229" style="fill:none;stroke-width:.26458;stroke:#000000"/><text x="16.636366" y="201.47922" style="fill:#000000;font-family:sans-serif;font-feature-settings:normal;font-size:3.5278px;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal;letter-spacing:0px;line-height:1.25;stroke-width:.26458;word-spacing:0px" xml:space="preserve"><tspan x="16.636366" y="201.47922" style="font-family:sans-serif;font-feature-settings:normal;font-size:2.8222px;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal;stroke-width:.26458">Virtio-SCSI device</tspan></text></g><g transform="translate(-5.0685e-6 -5.2917)"><rect x="44.979" y="196.46" width="39.688" height="13.229" ry="0" style="fill:none;stroke-width:.26458;stroke:#000000"/><text x="46.195286" y="201.31316" style="fill:#000000;font-family:sans-serif;font-feature-settings:normal;font-size:3.5278px;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal;letter-spacing:0px;line-height:1.25;stroke-width:.26458;word-spacing:0px" xml:space="preserve"><tspan x="46.195286" y="201.31316" style="font-family:sans-serif;font-feature-settings:normal;font-size:2.8222px;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal;stroke-width:.26458">Vhost-user driver (master)</tspan></text></g><g transform="translate(0 6.6146)"><g><rect x="54.24" y="154.12" width="55.562" height="17.198" ry="2.6458" style="fill:#e3f4d7;stroke-dasharray:0.52999997, 0.52999997;stroke-width:.265;stroke:#000000"/><text x="64.25103" y="157.5067" style="fill:#000000;font-family:sans-serif;font-feature-settings:normal;font-size:3.5278px;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal;letter-spacing:0px;line-height:1.25;stroke-width:.26458;word-spacing:0px" xml:space="preserve"><tspan x="64.25103" y="157.5067" style="font-family:sans-serif;font-feature-settings:normal;font-size:2.8222px;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal;stroke-width:.26458">Shared hugepage memory</tspan></text></g><g><g><rect x="58.208" y="159.42" width="47.625" height="5.2917" ry="5.0849e-6" style="fill:#c3e8aa;stroke-width:.265;stroke:#000000"/><text x="76.179329" y="162.79837" style="fill:#000000;font-family:sans-serif;font-feature-settings:normal;font-size:3.5278px;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal;letter-spacing:0px;line-height:1.25;stroke-width:.26458;word-spacing:0px" xml:space="preserve"><tspan x="76.179329" y="162.79837" style="font-family:sans-serif;font-feature-settings:normal;font-size:2.8222px;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal;stroke-width:.26458">Virtqueues</tspan></text></g><g><rect x="58.208" y="164.71" width="47.625" height="5.2917" ry="1.5259e-5" style="fill:#c3e8aa;stroke-width:.265;stroke:#000000"/><text x="76.452179" y="168.17548" style="fill:#000000;font-family:sans-serif;font-feature-settings:normal;font-size:3.5278px;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal;letter-spacing:0px;line-height:1.25;stroke-width:.26458;word-spacing:0px" xml:space="preserve"><tspan x="76.452179" y="168.17548" style="font-family:sans-serif;font-feature-settings:normal;font-size:2.8222px;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal;stroke-width:.26458">I/O buffers</tspan></text></g></g></g><path d="m127 173.97-21.167 1e-5" style="fill:none;marker-end:url(#c);marker-start:url(#l);stroke-dasharray:1.05833327, 1.05833327;stroke-width:.26458;stroke:#000000"/><path d="m106.28 168.61 15.433.0673" style="fill:none;marker-end:url(#d);stroke-dasharray:1.05833327, 1.05833327;stroke-width:.26458;stroke:#000000"/><text x="110.86868" y="166.85257" style="fill:#000000;font-family:sans-serif;font-size:10.583px;letter-spacing:0px;line-height:1.25;stroke-width:.26458;word-spacing:0px" xml:space="preserve"><tspan x="110.86868" y="166.85257" style="font-family:sans-serif;font-feature-settings:normal;font-size:2.8222px;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal;stroke-width:.26458">polling</tspan></text><text x="112.17093" y="173.11574" style="fill:#000000;font-family:sans-serif;font-size:10.583px;letter-spacing:0px;line-height:1.25;stroke-width:.26458;word-spacing:0px" xml:space="preserve"><tspan x="112.17093" y="173.11574" style="font-family:sans-serif;font-feature-settings:normal;font-size:2.8222px;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal;stroke-width:.26458">DMA</tspan></text><text x="67.980347" y="228.13426" style="fill:#000000;font-family:sans-serif;font-feature-settings:normal;font-size:3.5278px;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal;letter-spacing:0px;line-height:1.25;stroke-width:.26458;word-spacing:0px" xml:space="preserve"><tspan x="67.980347" y="228.13426" style="stroke-width:.26458">KVM</tspan></text><text x="69.351151" y="202.76837" style="fill:#000000;font-family:sans-serif;font-feature-settings:normal;font-size:3.5278px;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal;letter-spacing:0px;line-height:1.25;stroke-width:.26458;word-spacing:0px" xml:space="preserve"><tspan x="69.351151" y="202.76837" style="font-family:sans-serif;font-feature-settings:normal;font-size:2.8222px;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal;stroke-width:.26458">callfd</tspan></text><text x="106.9275" y="200.63379" style="fill:#000000;font-family:sans-serif;font-feature-settings:normal;font-size:3.5278px;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal;letter-spacing:0px;line-height:1.25;stroke-width:.26458;word-spacing:0px" xml:space="preserve"><tspan x="106.9275" y="200.63379" style="font-family:sans-serif;font-feature-settings:normal;font-size:2.8222px;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal;stroke-width:.26458">eventfd interrupt</tspan></text><path d="m166.69 184.55v17.198c-21.167 0-60.854 1e-5-82.021 1e-5" style="fill:none;marker-end:url(#e);stroke-dasharray:1.58999992, 1.58999992;stroke-width:.265;stroke:#000000"/><text x="72.494453" y="214.47757" style="fill:#000000;font-family:sans-serif;font-feature-settings:normal;font-size:3.5278px;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal;letter-spacing:0px;line-height:1.25;stroke-width:.26458;word-spacing:0px" xml:space="preserve"><tspan x="72.494453" y="214.47757" style="font-family:sans-serif;font-feature-settings:normal;font-size:2.8222px;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal;stroke-width:.26458">irqfd</tspan></text><text x="23.784939" y="158.1282" style="fill:#000000;font-family:sans-serif;font-feature-settings:normal;font-size:3.5278px;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal;letter-spacing:0px;line-height:1.25;stroke-width:.26458;word-spacing:0px" xml:space="preserve"><tspan x="23.784939" y="158.1282">Virtio-SCSI PCI</tspan><tspan x="23.784939" y="162.53793">driver</tspan></text><path d="m54.24 171.32h-10.583" style="fill:none;marker-end:url(#k);marker-start:url(#j);stroke-dasharray:0.79499996, 0.79499996;stroke-width:.265;stroke:#000000"/><text x="18.493273" y="148.83333" style="fill:#000000;font-family:sans-serif;font-feature-settings:normal;font-size:3.5278px;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal;letter-spacing:0px;line-height:1.25;stroke-width:.26458;word-spacing:0px" xml:space="preserve"><tspan x="18.493273" y="148.83333" style="font-family:sans-serif;font-feature-settings:normal;font-size:3.5278px;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal;stroke-width:.26458">VM</tspan></text><rect x="127" y="179.26" width="30.427" height="5.2917" style="fill:none;stroke-dasharray:1.05833328, 1.05833328;stroke-width:.26458;stroke:#000000"/><text x="128.16721" y="182.72755" style="fill:#000000;font-family:sans-serif;font-feature-settings:normal;font-size:3.5278px;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal;letter-spacing:0px;line-height:1.25;stroke-width:.26458;word-spacing:0px" xml:space="preserve"><tspan x="128.16721" y="182.72755" style="font-family:sans-serif;font-feature-settings:normal;font-size:2.8222px;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal;stroke-width:.26458">Unix domain socket</tspan></text><text x="104.54487" y="194.10464" style="fill:#000000;font-family:sans-serif;font-feature-settings:normal;font-size:3.5278px;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal;letter-spacing:0px;line-height:1.25;stroke-width:.26458;word-spacing:0px" xml:space="preserve"><tspan x="104.54487" y="194.10464" style="font-family:sans-serif;font-feature-settings:normal;font-size:2.8222px;font-variant-caps:normal;font-variant-ligatures:normal;font-variant-numeric:normal;stroke-width:.26458">Vhost-user messages</tspan></text><path d="m142.88 184.55v10.583h-58.208" style="fill:none;marker-end:url(#b);marker-start:url(#a);stroke-dasharray:1.58999992, 1.58999992;stroke-width:.265;stroke:#000000"/></g></svg>
-- 
cgit v1.2.3