diff mbox series

[v2] xfs: add LARP state transition diagram

Message ID 20220830232022.55523-1-catherine.hoang@oracle.com (mailing list archive)
State Superseded
Headers show
Series [v2] xfs: add LARP state transition diagram | expand

Commit Message

Catherine Hoang Aug. 30, 2022, 11:20 p.m. UTC 
From: Dave Chinner <dchinner@redhat.com>

Add a state transition diagram documenting each logged attribute state
and their transition conditions. The diagram can be built from the
included text source file with PlantUML.

[cathhoan: add descriptions, links to docs, and diagram image]

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Catherine Hoang <catherine.hoang@oracle.com>
---
 Documentation/filesystems/xfs-larp-state.svg |   1 +
 Documentation/filesystems/xfs-larp-state.txt | 103 +++++++++++++++++++
 2 files changed, 104 insertions(+)
 create mode 100644 Documentation/filesystems/xfs-larp-state.svg
 create mode 100644 Documentation/filesystems/xfs-larp-state.txt

Comments

Allison Henderson Sept. 22, 2022, 5:53 a.m. UTC | #1 
Sorry I got so tied up these last couple weeks!  I am fine with the
diagram if everyone else is.  Thanks Catherine for getting this
updated!

Reviewed-by: Allison Henderson <allison.henderson@oracle.com>

On Tue, 2022-08-30 at 16:20 -0700, Catherine Hoang wrote:
> From: Dave Chinner <dchinner@redhat.com>
> 
> Add a state transition diagram documenting each logged attribute
> state
> and their transition conditions. The diagram can be built from the
> included text source file with PlantUML.
> 
> [cathhoan: add descriptions, links to docs, and diagram image]
> 
> Signed-off-by: Dave Chinner <dchinner@redhat.com>
> Signed-off-by: Catherine Hoang <catherine.hoang@oracle.com>
> ---
>  Documentation/filesystems/xfs-larp-state.svg |   1 +
>  Documentation/filesystems/xfs-larp-state.txt | 103
> +++++++++++++++++++
>  2 files changed, 104 insertions(+)
>  create mode 100644 Documentation/filesystems/xfs-larp-state.svg
>  create mode 100644 Documentation/filesystems/xfs-larp-state.txt
> 
> diff --git a/Documentation/filesystems/xfs-larp-state.svg
> b/Documentation/filesystems/xfs-larp-state.svg
> new file mode 100644
> index 000000000000..d93078300d91
> --- /dev/null
> +++ b/Documentation/filesystems/xfs-larp-state.svg
> @@ -0,0 +1 @@
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> lengthAdjust="spacingAndGlyphs" textLength="113" x="1011"
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> filter="url(#fc2ynpqha1fpc)" height="50.2656" rx="12.5" ry="12.5"
> style="stroke: #A80036; stroke-width: 1.5;" width="199" x="230.5"
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> textLength="232" x="209" y="1132.4355">allocate blocks and set remote
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> textLength="161" x="101.5" y="584.4355">add attr to shortform
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> family="sans-serif" font-size="12" lengthAdjust="spacingAndGlyphs"
> textLength="181" x="210.5" y="728.4355">add attr to inode in leaf
> form</text><rect fill="#FEFECE" filter="url(#fc2ynpqha1fpc)"
> height="50.2656" rx="12.5" ry="12.5" style="stroke: #A80036; stroke-
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> lengthAdjust="spacingAndGlyphs" textLength="100" x="723"
> y="156.0669">replace existing</text><!--link XFS_DAS_DONE to *end--
> ><path d="M717,1370.21 C717,1387.84 717,1411.13 717,1425.84 "
> fill="none" id="XFS_DAS_DONE-*end" style="stroke: #A80036; stroke-
> width: 1.0;"/><polygon fill="#A80036"
> points="717,1430.84,721,1421.84,717,1425.84,713,1421.84,717,1430.84"
> style="stroke: #A80036; stroke-width: 1.0;"/></g></svg>
> \ No newline at end of file
> diff --git a/Documentation/filesystems/xfs-larp-state.txt
> b/Documentation/filesystems/xfs-larp-state.txt
> new file mode 100644
> index 000000000000..7a54773665a6
> --- /dev/null
> +++ b/Documentation/filesystems/xfs-larp-state.txt
> @@ -0,0 +1,103 @@
> +/'
> +PlantUML documentation:
> +Getting started - https://plantuml.com/starting
> +State diagram - https://plantuml.com/state-diagram
> +'/
> +
> +@startuml
> +
> +state REMOTE_ADD {
> +       XFS_DAS_..._SET_RMT : find space for remote blocks
> +       XFS_DAS_..._ALLOC_RMT : allocate blocks and set remote value
> +
> +       XFS_DAS_..._SET_RMT --> XFS_DAS_..._ALLOC_RMT
> +}
> +
> +state ADD {
> +       XFS_DAS_SF_ADD : add attr to shortform fork
> +       XFS_DAS_LEAF_ADD : add attr to inode in leaf form
> +       XFS_DAS_NODE_ADD : add attr to node format attribute tree
> +
> +       state add_entry <<entryPoint>>
> +       state add_form <<choice>>
> +       add_entry --> add_form
> +       add_form --> XFS_DAS_SF_ADD : short form
> +       add_form --> XFS_DAS_LEAF_ADD : leaf form
> +       add_form --> XFS_DAS_NODE_ADD : node form
> +
> +       XFS_DAS_SF_ADD --> XFS_DAS_LEAF_ADD : Full or too large
> +       XFS_DAS_LEAF_ADD --> XFS_DAS_NODE_ADD : full or too large
> +
> +       XFS_DAS_LEAF_ADD --> XFS_DAS_..._SET_RMT : remote xattr
> +       XFS_DAS_NODE_ADD --> XFS_DAS_..._SET_RMT : remote xattr
> +}
> +
> +state REMOVE {
> +       XFS_DAS_SF_REMOVE : remove attr from shortform fork
> +       XFS_DAS_LEAF_REMOVE : remove attr from an inode in leaf form
> +       XFS_DAS_NODE_REMOVE : setup for removal
> +       XFS_DAS_NODE_REMOVE : (attr exists and blocks are valid)
> +
> +       state remove_entry <<entryPoint>>
> +       state remove_form <<choice>>
> +       remove_entry --> remove_form
> +       remove_form --> XFS_DAS_SF_REMOVE : short form
> +       remove_form --> XFS_DAS_LEAF_REMOVE : leaf form
> +       remove_form --> XFS_DAS_NODE_REMOVE : node form
> +}
> +
> +state REPLACE {
> +       state replace_choice <<choice>>
> +       replace_choice --> add_entry : larp disable
> +       replace_choice --> remove_entry : larp enabled
> +}
> +
> +
> +state OLD_REPLACE {
> +       XFS_DAS_..._REPLACE : atomic INCOMPLETE flag flip
> +       XFS_DAS_..._REMOVE_OLD : restore original xattr state for
> remove
> +       XFS_DAS_..._REMOVE_OLD : invalidate old xattr
> +
> +       XFS_DAS_..._REPLACE --> XFS_DAS_..._REMOVE_OLD
> +}
> +
> +state REMOVE_XATTR {
> +       XFS_DAS_..._REMOVE_RMT : remove remote attribute blocks
> +       XFS_DAS_..._REMOVE_ATTR : remove attribute name from
> leaf/node block
> +
> +       state remove_xattr_choice <<choice>>
> +       remove_xattr_choice --> XFS_DAS_..._REMOVE_RMT : Remote xattr
> +       remove_xattr_choice --> XFS_DAS_..._REMOVE_ATTR : Local xattr
> +
> +       XFS_DAS_..._REMOVE_RMT --> XFS_DAS_..._REMOVE_ATTR
> +}
> +
> +state XFS_DAS_DONE {
> +}
> +
> +state add_done <<choice>>
> +add_done -down-> XFS_DAS_DONE : Operation Complete
> +add_done -up-> XFS_DAS_..._REPLACE : LARP disabled REPLACE
> +XFS_DAS_SF_ADD -down-> add_done : Success
> +XFS_DAS_LEAF_ADD -down-> add_done : Success
> +XFS_DAS_NODE_ADD -down-> add_done : Success
> +XFS_DAS_..._ALLOC_RMT -down-> add_done : Success
> +
> +state remove_done <<choice>>
> +remove_done -down-> XFS_DAS_DONE : Operation Complete
> +remove_done -up-> add_entry : LARP enabled REPLACE
> +XFS_DAS_SF_REMOVE -down-> remove_done : Success
> +XFS_DAS_LEAF_REMOVE -down-> remove_done : Success
> +XFS_DAS_NODE_REMOVE -down-> remove_done : Success
> +XFS_DAS_..._REMOVE_ATTR -down-> remove_done : Success
> +
> +XFS_DAS_..._REMOVE_OLD --> remove_xattr_choice
> +XFS_DAS_NODE_REMOVE --> remove_xattr_choice
> +
> +state set_choice <<choice>>
> +[*] --> set_choice
> +set_choice --> add_entry : add new
> +set_choice --> remove_entry : remove existing
> +set_choice --> replace_choice : replace existing
> +XFS_DAS_DONE --> [*]
> +@enduml
Darrick J. Wong Sept. 24, 2022, 12:55 a.m. UTC | #2 
On Tue, Aug 30, 2022 at 04:20:22PM -0700, Catherine Hoang wrote:
> From: Dave Chinner <dchinner@redhat.com>
> 
> Add a state transition diagram documenting each logged attribute state
> and their transition conditions. The diagram can be built from the
> included text source file with PlantUML.
> 
> [cathhoan: add descriptions, links to docs, and diagram image]
> 
> Signed-off-by: Dave Chinner <dchinner@redhat.com>
> Signed-off-by: Catherine Hoang <catherine.hoang@oracle.com>
> ---
>  Documentation/filesystems/xfs-larp-state.svg |   1 +

Oh wow that's all one line?  Er.. does the plantuml gui have a means to
spit out prettyfied svg?

>  Documentation/filesystems/xfs-larp-state.txt | 103 +++++++++++++++++++

/me wonders if this should be .pu and not .txt, but otherwise I'm mostly
ok with it.

--D

>  2 files changed, 104 insertions(+)
>  create mode 100644 Documentation/filesystems/xfs-larp-state.svg
>  create mode 100644 Documentation/filesystems/xfs-larp-state.txt
> 
> diff --git a/Documentation/filesystems/xfs-larp-state.svg b/Documentation/filesystems/xfs-larp-state.svg
> new file mode 100644
> index 000000000000..d93078300d91
> --- /dev/null
> +++ b/Documentation/filesystems/xfs-larp-state.svg
> @@ -0,0 +1 @@
> +<?xml version="1.0" encoding="UTF-8" standalone="no"?><svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" contentScriptType="application/ecmascript" contentStyleType="text/css" height="1462px" preserveAspectRatio="none" style="width:1857px;height:1462px;" version="1.1" viewBox="0 0 1857 1462" width="1857px" zoomAndPan="magnify"><defs><filter height="300%" id="fc2ynpqha1fpc" width="300%" x="-1" y="-1"><feGaussianBlur result="blurOut" stdDeviation="2.0"/><feColorMatrix in="blurOut" result="blurOut2" type="matrix" values="0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 .4 0"/><feOffset dx="4.0" dy="4.0" in="blurOut2" result="blurOut3"/><feBlend in="SourceGraphic" in2="blurOut3" mode="normal"/></filter></defs><g><!--cluster REMOTE_ADD--><rect fill="#FEFECE" filter="url(#fc2ynpqha1fpc)" height="230" rx="12.5" ry="12.5" style="stroke: #A80036; stroke-width: 1.5;" width="284" x="188" y="926"/><rect fill="#FFFFFF" height="197.7031" rx="12.5" ry="12.5" style="stroke: #FFFFFF; stroke-width: 1.0;" width="278" x="191" y="955.2969"/><line style="stroke: #A80036; stroke-width: 1.5;" x1="188" x2="472" y1="952.2969" y2="952.2969"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="98" x="281" y="942.9951">REMOTE_ADD</text><!--cluster ADD--><rect fill="#FEFECE" filter="url(#fc2ynpqha1fpc)" height="559" rx="12.5" ry="12.5" style="stroke: #A80036; stroke-width: 1.5;" width="384" x="43" y="320"/><rect fill="#FFFFFF" height="526.7031" rx="12.5" ry="12.5" style="stroke: #FFFFFF; stroke-width: 1.0;" width="378" x="46" y="349.2969"/><line style="stroke: #A80036; stroke-width: 1.5;" x1="43" x2="427" y1="346.2969" y2="346.2969"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="31" x="219.5" y="337.9951">ADD</text><!--cluster REMOVE--><rect fill="#FEFECE" filter="url(#fc2ynpqha1fpc)" height="295" rx="12.5" ry="12.5" style="stroke: #A80036; stroke-width: 1.5;" width="804" x="1041" y="320"/><rect fill="#FFFFFF" height="262.7031" rx="12.5" ry="12.5" style="stroke: #FFFFFF; stroke-width: 1.0;" width="798" x="1044" y="349.2969"/><line style="stroke: #A80036; stroke-width: 1.5;" x1="1041" x2="1845" y1="346.2969" y2="346.2969"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="60" x="1413" y="337.9951">REMOVE</text><!--cluster REPLACE--><rect fill="#FEFECE" filter="url(#fc2ynpqha1fpc)" height="75" rx="12.5" ry="12.5" style="stroke: #A80036; stroke-width: 1.5;" width="79" x="683" y="176"/><rect fill="#FFFFFF" height="42.7031" rx="12.5" ry="12.5" style="stroke: #FFFFFF; stroke-width: 1.0;" width="73" x="686" y="205.2969"/><line style="stroke: #A80036; stroke-width: 1.5;" x1="683" x2="762" y1="202.2969" y2="202.2969"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="63" x="691" y="192.9951">REPLACE</text><!--cluster OLD_REPLACE--><rect fill="#FEFECE" filter="url(#fc2ynpqha1fpc)" height="242" rx="12.5" ry="12.5" style="stroke: #A80036; stroke-width: 1.5;" width="290" x="739" y="373"/><rect fill="#FFFFFF" height="209.7031" rx="12.5" ry="12.5" style="stroke: #FFFFFF; stroke-width: 1.0;" width="284" x="742" y="402.2969"/><line style="stroke: #A80036; stroke-width: 1.5;" x1="739" x2="1029" y1="399.2969" y2="399.2969"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="99" x="834.5" y="389.9951">OLD_REPLACE</text><!--cluster REMOVE_XATTR--><rect fill="#FEFECE" filter="url(#fc2ynpqha1fpc)" height="363" rx="12.5" ry="12.5" style="stroke: #A80036; stroke-width: 1.5;" width="389" x="873" y="664"/><rect fill="#FFFFFF" height="330.7031" rx="12.5" ry="12.5" style="stroke: #FFFFFF; stroke-width: 1.0;" width="383" x="876" y="693.2969"/><line style="stroke: #A80036; stroke-width: 1.5;" x1="873" x2="1262" y1="690.2969" y2="690.2969"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="113" x="1011" y="680.9951">REMOVE_XATTR</text><rect fill="#FEFECE" filter="url(#fc2ynpqha1fpc)" height="50.2656" rx="12.5" ry="12.5" style="stroke: #A80036; stroke-width: 1.5;" width="199" x="230.5" y="961"/><line style="stroke: #A80036; stroke-width: 1.5;" x1="230.5" x2="429.5" y1="987.2969" y2="987.2969"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="153" x="253.5" y="978.9951">XFS_DAS_..._SET_RMT</text><text fill="#000000" font-family="sans-serif" font-size="12" lengthAdjust="spacingAndGlyphs" textLength="179" x="235.5" y="1003.4355">find space for remote blocks</text><rect fill="#FEFECE" filter="url(#fc2ynpqha1fpc)" height="50.2656" rx="12.5" ry="12.5" style="stroke: #A80036; stroke-width: 1.5;" width="252" x="204" y="1090"/><line style="stroke: #A80036; stroke-width: 1.5;" x1="204" x2="456" y1="1116.2969" y2="1116.2969"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="170" x="245" y="1107.9951">XFS_DAS_..._ALLOC_RMT</text><text fill="#000000" font-family="sans-serif" font-size="12" lengthAdjust="spacingAndGlyphs" textLength="232" x="209" y="1132.4355">allocate blocks and set remote value</text><rect fill="#FEFECE" filter="url(#fc2ynpqha1fpc)" height="50.2656" rx="12.5" ry="12.5" style="stroke: #A80036; stroke-width: 1.5;" width="181" x="96.5" y="542"/><line style="stroke: #A80036; stroke-width: 1.5;" x1="96.5" x2="277.5" y1="568.2969" y2="568.2969"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="124" x="125" y="559.9951">XFS_DAS_SF_ADD</text><text fill="#000000" font-family="sans-serif" font-size="12" lengthAdjust="spacingAndGlyphs" textLength="161" x="101.5" y="584.4355">add attr to shortform fork</text><rect fill="#FEFECE" filter="url(#fc2ynpqha1fpc)" height="50.2656" rx="12.5" ry="12.5" style="stroke: #A80036; stroke-width: 1.5;" width="201" x="205.5" y="686"/><line style="stroke: #A80036; stroke-width: 1.5;" x1="205.5" x2="406.5" y1="712.2969" y2="712.2969"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="140" x="236" y="703.9951">XFS_DAS_LEAF_ADD</text><text fill="#000000" font-family="sans-serif" font-size="12" lengthAdjust="spacingAndGlyphs" textLength="181" x="210.5" y="728.4355">add attr to inode in leaf form</text><rect fill="#FEFECE" filter="url(#fc2ynpqha1fpc)" height="50.2656" rx="12.5" ry="12.5" style="stroke: #A80036; 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stroke-width: 1.0;"/><polygon fill="#A80036" points="1248.06,1108.6,1257.3489,1105.3263,1251.6943,1105.166,1251.8545,1099.5115,1248.06,1108.6" style="stroke: #A80036; stroke-width: 1.0;"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="53" x="1317" y="842.5669">Success</text><!--link XFS_DAS_..._REMOVE_ATTR to remove_done--><path d="M1125.42,1011.19 C1157.86,1039.79 1210.2,1085.95 1231.98,1105.17 " fill="none" id="XFS_DAS_..._REMOVE_ATTR-remove_done" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="1235.92,1108.64,1231.8338,1099.6788,1232.1767,1105.3253,1226.5302,1105.6682,1235.92,1108.64" style="stroke: #A80036; stroke-width: 1.0;"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="53" x="1179" y="1056.0669">Success</text><!--link XFS_DAS_..._REMOVE_OLD to remove_xattr_choice--><path d="M932.94,599.16 C985.76,632.8 1066.27,684.06 1095.71,702.81 " fill="none" id="XFS_DAS_..._REMOVE_OLD-remove_xattr_choice" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="1099.99,705.53,1094.5499,697.3199,1095.7735,702.8428,1090.2505,704.0664,1099.99,705.53" style="stroke: #A80036; stroke-width: 1.0;"/><!--link XFS_DAS_NODE_REMOVE to remove_xattr_choice--><path d="M1157.74,599.16 C1143.62,630 1122.72,675.66 1112.73,697.49 " fill="none" id="XFS_DAS_NODE_REMOVE-remove_xattr_choice" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="1110.54,702.26,1117.9134,695.7306,1112.6144,697.7106,1110.6344,692.4116,1110.54,702.26" style="stroke: #A80036; stroke-width: 1.0;"/><!--link *start to set_choice--><path d="M722,28.29 C722,41.73 722,66.81 722,83.45 " fill="none" id="*start-set_choice" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="722,88.75,726,79.75,722,83.75,718,79.75,722,88.75" style="stroke: #A80036; stroke-width: 1.0;"/><!--link set_choice to add_entry--><path d="M715.46,106.53 C675.48,134.25 464.17,280.75 417.94,312.8 " fill="none" id="set_choice-add_entry" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="413.56,315.84,423.2339,313.9919,417.6668,312.988,418.6707,307.421,413.56,315.84" style="stroke: #A80036; stroke-width: 1.0;"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="53" x="627" y="227.5669">add new</text><!--link set_choice to remove_entry--><path d="M730.92,104.39 C750.14,109.72 796.57,123.68 832,143 C926.76,194.66 1023.54,284.76 1051.19,311.39 " fill="none" id="set_choice-remove_entry" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="1055.03,315.1,1051.3279,305.9734,1051.4308,311.6293,1045.7749,311.7322,1055.03,315.1" style="stroke: #A80036; stroke-width: 1.0;"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="102" x="994" y="227.5669">remove existing</text><!--link set_choice to replace_choice--><path d="M722,113.07 C722,134.33 722,180.92 722,205.72 " fill="none" id="set_choice-replace_choice" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="722,210.95,726,201.95,722,205.95,718,201.95,722,210.95" style="stroke: #A80036; stroke-width: 1.0;"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="100" x="723" y="156.0669">replace existing</text><!--link XFS_DAS_DONE to *end--><path d="M717,1370.21 C717,1387.84 717,1411.13 717,1425.84 " fill="none" id="XFS_DAS_DONE-*end" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="717,1430.84,721,1421.84,717,1425.84,713,1421.84,717,1430.84" style="stroke: #A80036; stroke-width: 1.0;"/></g></svg>
> \ No newline at end of file
> diff --git a/Documentation/filesystems/xfs-larp-state.txt b/Documentation/filesystems/xfs-larp-state.txt
> new file mode 100644
> index 000000000000..7a54773665a6
> --- /dev/null
> +++ b/Documentation/filesystems/xfs-larp-state.txt
> @@ -0,0 +1,103 @@
> +/'
> +PlantUML documentation:
> +Getting started - https://plantuml.com/starting
> +State diagram - https://plantuml.com/state-diagram
> +'/
> +
> +@startuml
> +
> +state REMOTE_ADD {
> +	XFS_DAS_..._SET_RMT : find space for remote blocks
> +	XFS_DAS_..._ALLOC_RMT : allocate blocks and set remote value
> +
> +	XFS_DAS_..._SET_RMT --> XFS_DAS_..._ALLOC_RMT
> +}
> +
> +state ADD {
> +	XFS_DAS_SF_ADD : add attr to shortform fork
> +	XFS_DAS_LEAF_ADD : add attr to inode in leaf form
> +	XFS_DAS_NODE_ADD : add attr to node format attribute tree
> +
> +	state add_entry <<entryPoint>>
> +	state add_form <<choice>>
> +	add_entry --> add_form
> +	add_form --> XFS_DAS_SF_ADD : short form
> +	add_form --> XFS_DAS_LEAF_ADD : leaf form
> +	add_form --> XFS_DAS_NODE_ADD : node form
> +
> +	XFS_DAS_SF_ADD --> XFS_DAS_LEAF_ADD : Full or too large
> +	XFS_DAS_LEAF_ADD --> XFS_DAS_NODE_ADD : full or too large
> +
> +	XFS_DAS_LEAF_ADD --> XFS_DAS_..._SET_RMT : remote xattr
> +	XFS_DAS_NODE_ADD --> XFS_DAS_..._SET_RMT : remote xattr
> +}
> +
> +state REMOVE {
> +	XFS_DAS_SF_REMOVE : remove attr from shortform fork
> +	XFS_DAS_LEAF_REMOVE : remove attr from an inode in leaf form
> +	XFS_DAS_NODE_REMOVE : setup for removal
> +	XFS_DAS_NODE_REMOVE : (attr exists and blocks are valid)
> +
> +	state remove_entry <<entryPoint>>
> +	state remove_form <<choice>>
> +	remove_entry --> remove_form
> +	remove_form --> XFS_DAS_SF_REMOVE : short form
> +	remove_form --> XFS_DAS_LEAF_REMOVE : leaf form
> +	remove_form --> XFS_DAS_NODE_REMOVE : node form
> +}
> +
> +state REPLACE {
> +	state replace_choice <<choice>>
> +	replace_choice --> add_entry : larp disable
> +	replace_choice --> remove_entry : larp enabled
> +}
> +
> +
> +state OLD_REPLACE {
> +	XFS_DAS_..._REPLACE : atomic INCOMPLETE flag flip
> +	XFS_DAS_..._REMOVE_OLD : restore original xattr state for remove
> +	XFS_DAS_..._REMOVE_OLD : invalidate old xattr
> +
> +	XFS_DAS_..._REPLACE --> XFS_DAS_..._REMOVE_OLD
> +}
> +
> +state REMOVE_XATTR {
> +	XFS_DAS_..._REMOVE_RMT : remove remote attribute blocks
> +	XFS_DAS_..._REMOVE_ATTR : remove attribute name from leaf/node block
> +
> +	state remove_xattr_choice <<choice>>
> +	remove_xattr_choice --> XFS_DAS_..._REMOVE_RMT : Remote xattr
> +	remove_xattr_choice --> XFS_DAS_..._REMOVE_ATTR : Local xattr
> +
> +	XFS_DAS_..._REMOVE_RMT --> XFS_DAS_..._REMOVE_ATTR
> +}
> +
> +state XFS_DAS_DONE {
> +}
> +
> +state add_done <<choice>>
> +add_done -down-> XFS_DAS_DONE : Operation Complete
> +add_done -up-> XFS_DAS_..._REPLACE : LARP disabled REPLACE
> +XFS_DAS_SF_ADD -down-> add_done : Success
> +XFS_DAS_LEAF_ADD -down-> add_done : Success
> +XFS_DAS_NODE_ADD -down-> add_done : Success
> +XFS_DAS_..._ALLOC_RMT -down-> add_done : Success
> +
> +state remove_done <<choice>>
> +remove_done -down-> XFS_DAS_DONE : Operation Complete
> +remove_done -up-> add_entry : LARP enabled REPLACE
> +XFS_DAS_SF_REMOVE -down-> remove_done : Success
> +XFS_DAS_LEAF_REMOVE -down-> remove_done : Success
> +XFS_DAS_NODE_REMOVE -down-> remove_done : Success
> +XFS_DAS_..._REMOVE_ATTR -down-> remove_done : Success
> +
> +XFS_DAS_..._REMOVE_OLD --> remove_xattr_choice
> +XFS_DAS_NODE_REMOVE --> remove_xattr_choice
> +
> +state set_choice <<choice>>
> +[*] --> set_choice
> +set_choice --> add_entry : add new
> +set_choice --> remove_entry : remove existing
> +set_choice --> replace_choice : replace existing
> +XFS_DAS_DONE --> [*]
> +@enduml
> -- 
> 2.25.1
>
Catherine Hoang Sept. 27, 2022, 12:53 a.m. UTC | #3 
> On Sep 23, 2022, at 5:55 PM, Darrick J. Wong <djwong@kernel.org> wrote:
> 
> On Tue, Aug 30, 2022 at 04:20:22PM -0700, Catherine Hoang wrote:
>> From: Dave Chinner <dchinner@redhat.com>
>> 
>> Add a state transition diagram documenting each logged attribute state
>> and their transition conditions. The diagram can be built from the
>> included text source file with PlantUML.
>> 
>> [cathhoan: add descriptions, links to docs, and diagram image]
>> 
>> Signed-off-by: Dave Chinner <dchinner@redhat.com>
>> Signed-off-by: Catherine Hoang <catherine.hoang@oracle.com>
>> ---
>> Documentation/filesystems/xfs-larp-state.svg |   1 +
> 
> Oh wow that's all one line?  Er.. does the plantuml gui have a means to
> spit out prettyfied svg?

Plantuml doesn’t have that option as far as I’m aware of, but I can always
make this prettier using another tool.
> 
>> Documentation/filesystems/xfs-larp-state.txt | 103 +++++++++++++++++++
> 
> /me wonders if this should be .pu and not .txt, but otherwise I'm mostly
> ok with it.

Sure, I’ll change that. Thanks for reviewing!
> 
> --D
> 
>> 2 files changed, 104 insertions(+)
>> create mode 100644 Documentation/filesystems/xfs-larp-state.svg
>> create mode 100644 Documentation/filesystems/xfs-larp-state.txt
>> 
>> diff --git a/Documentation/filesystems/xfs-larp-state.svg b/Documentation/filesystems/xfs-larp-state.svg
>> new file mode 100644
>> index 000000000000..d93078300d91
>> --- /dev/null
>> +++ b/Documentation/filesystems/xfs-larp-state.svg
>> @@ -0,0 +1 @@
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stroke-width: 1.5;" width="804" x="1041" y="320"/><rect fill="#FFFFFF" height="262.7031" rx="12.5" ry="12.5" style="stroke: #FFFFFF; stroke-width: 1.0;" width="798" x="1044" y="349.2969"/><line style="stroke: #A80036; stroke-width: 1.5;" x1="1041" x2="1845" y1="346.2969" y2="346.2969"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="60" x="1413" y="337.9951">REMOVE</text><!--cluster REPLACE--><rect fill="#FEFECE" filter="url(#fc2ynpqha1fpc)" height="75" rx="12.5" ry="12.5" style="stroke: #A80036; stroke-width: 1.5;" width="79" x="683" y="176"/><rect fill="#FFFFFF" height="42.7031" rx="12.5" ry="12.5" style="stroke: #FFFFFF; stroke-width: 1.0;" width="73" x="686" y="205.2969"/><line style="stroke: #A80036; stroke-width: 1.5;" x1="683" x2="762" y1="202.2969" y2="202.2969"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="63" x="691" y="192.9951">REPLACE</text><!--cluster OLD_REPLACE--><rect fill="#FEFECE" filter="url(#fc2ynpqha1fpc)" height="242" rx="12.5" ry="12.5" style="stroke: #A80036; stroke-width: 1.5;" width="290" x="739" y="373"/><rect fill="#FFFFFF" height="209.7031" rx="12.5" ry="12.5" style="stroke: #FFFFFF; stroke-width: 1.0;" width="284" x="742" y="402.2969"/><line style="stroke: #A80036; stroke-width: 1.5;" x1="739" x2="1029" y1="399.2969" y2="399.2969"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="99" x="834.5" y="389.9951">OLD_REPLACE</text><!--cluster REMOVE_XATTR--><rect fill="#FEFECE" filter="url(#fc2ynpqha1fpc)" height="363" rx="12.5" ry="12.5" style="stroke: #A80036; stroke-width: 1.5;" width="389" x="873" y="664"/><rect fill="#FFFFFF" height="330.7031" rx="12.5" ry="12.5" style="stroke: #FFFFFF; stroke-width: 1.0;" width="383" x="876" y="693.2969"/><line style="stroke: #A80036; stroke-width: 1.5;" x1="873" x2="1262" y1="690.2969" y2="690.2969"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="113" x="1011" y="680.9951">REMOVE_XATTR</text><rect fill="#FEFECE" filter="url(#fc2ynpqha1fpc)" height="50.2656" rx="12.5" ry="12.5" style="stroke: #A80036; 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stroke-width: 1.5;" x1="1318" x2="1536" y1="568.2969" y2="568.2969"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="153" x="1350.5" y="559.9951">XFS_DAS_SF_REMOVE</text><text fill="#000000" font-family="sans-serif" font-size="12" lengthAdjust="spacingAndGlyphs" textLength="198" x="1323" y="584.4355">remove attr from shortform fork</text><rect fill="#FEFECE" filter="url(#fc2ynpqha1fpc)" height="50.2656" rx="12.5" ry="12.5" style="stroke: #A80036; stroke-width: 1.5;" width="258" x="1571" y="542"/><line style="stroke: #A80036; stroke-width: 1.5;" x1="1571" x2="1829" y1="568.2969" y2="568.2969"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="169" x="1615.5" y="559.9951">XFS_DAS_LEAF_REMOVE</text><text fill="#000000" font-family="sans-serif" font-size="12" lengthAdjust="spacingAndGlyphs" textLength="238" x="1576" y="584.4355">remove attr from an inode in leaf form</text><rect fill="#FEFECE" filter="url(#fc2ynpqha1fpc)" height="64.2344" rx="12.5" ry="12.5" style="stroke: #A80036; stroke-width: 1.5;" width="222" x="1061" y="535"/><line style="stroke: #A80036; stroke-width: 1.5;" x1="1061" x2="1283" y1="561.2969" y2="561.2969"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="177" x="1083.5" y="552.9951">XFS_DAS_NODE_REMOVE</text><text fill="#000000" font-family="sans-serif" font-size="12" lengthAdjust="spacingAndGlyphs" textLength="110" x="1066" y="577.4355">setup for removal</text><text fill="#000000" font-family="sans-serif" font-size="12" lengthAdjust="spacingAndGlyphs" textLength="202" x="1066" y="591.4043">(attr exists and blocks are valid)</text><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="94" x="1012" y="298.6982">remove_entry</text><ellipse cx="1059" cy="320" fill="#FEFECE" rx="6" ry="6" style="stroke: #A80036; stroke-width: 1.5;"/><polygon fill="#FEFECE" filter="url(#fc2ynpqha1fpc)" points="1299,421,1311,433,1299,445,1287,433,1299,421" style="stroke: #A80036; stroke-width: 1.5;"/><polygon fill="#FEFECE" filter="url(#fc2ynpqha1fpc)" points="722,211,734,223,722,235,710,223,722,211" style="stroke: #A80036; stroke-width: 1.5;"/><rect fill="#FEFECE" filter="url(#fc2ynpqha1fpc)" height="50.2656" rx="12.5" ry="12.5" style="stroke: #A80036; stroke-width: 1.5;" width="191" x="771.5" y="408"/><line style="stroke: #A80036; stroke-width: 1.5;" x1="771.5" x2="962.5" y1="434.2969" y2="434.2969"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="151" x="791.5" y="425.9951">XFS_DAS_..._REPLACE</text><text fill="#000000" font-family="sans-serif" font-size="12" lengthAdjust="spacingAndGlyphs" textLength="171" x="776.5" y="450.4355">atomic INCOMPLETE flag flip</text><rect fill="#FEFECE" filter="url(#fc2ynpqha1fpc)" height="64.2344" rx="12.5" ry="12.5" style="stroke: #A80036; stroke-width: 1.5;" width="257" x="755.5" y="535"/><line style="stroke: #A80036; stroke-width: 1.5;" x1="755.5" x2="1012.5" y1="561.2969" y2="561.2969"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="184" x="792" y="552.9951">XFS_DAS_..._REMOVE_OLD</text><text fill="#000000" font-family="sans-serif" font-size="12" lengthAdjust="spacingAndGlyphs" textLength="237" x="760.5" y="577.4355">restore original xattr state for remove</text><text fill="#000000" font-family="sans-serif" font-size="12" lengthAdjust="spacingAndGlyphs" textLength="116" x="760.5" y="591.4043">invalidate old xattr</text><rect fill="#FEFECE" filter="url(#fc2ynpqha1fpc)" height="50.2656" rx="12.5" ry="12.5" style="stroke: #A80036; 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stroke-width: 1.0;"/><polygon fill="#A80036" points="1099.99,705.53,1094.5499,697.3199,1095.7735,702.8428,1090.2505,704.0664,1099.99,705.53" style="stroke: #A80036; stroke-width: 1.0;"/><!--link XFS_DAS_NODE_REMOVE to remove_xattr_choice--><path d="M1157.74,599.16 C1143.62,630 1122.72,675.66 1112.73,697.49 " fill="none" id="XFS_DAS_NODE_REMOVE-remove_xattr_choice" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="1110.54,702.26,1117.9134,695.7306,1112.6144,697.7106,1110.6344,692.4116,1110.54,702.26" style="stroke: #A80036; stroke-width: 1.0;"/><!--link *start to set_choice--><path d="M722,28.29 C722,41.73 722,66.81 722,83.45 " fill="none" id="*start-set_choice" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="722,88.75,726,79.75,722,83.75,718,79.75,722,88.75" style="stroke: #A80036; stroke-width: 1.0;"/><!--link set_choice to add_entry--><path d="M715.46,106.53 C675.48,134.25 464.17,280.75 417.94,312.8 " fill="none" id="set_choice-add_entry" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="413.56,315.84,423.2339,313.9919,417.6668,312.988,418.6707,307.421,413.56,315.84" style="stroke: #A80036; stroke-width: 1.0;"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="53" x="627" y="227.5669">add new</text><!--link set_choice to remove_entry--><path d="M730.92,104.39 C750.14,109.72 796.57,123.68 832,143 C926.76,194.66 1023.54,284.76 1051.19,311.39 " fill="none" id="set_choice-remove_entry" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="1055.03,315.1,1051.3279,305.9734,1051.4308,311.6293,1045.7749,311.7322,1055.03,315.1" style="stroke: #A80036; stroke-width: 1.0;"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="102" x="994" y="227.5669">remove existing</text><!--link set_choice to replace_choice--><path d="M722,113.07 C722,134.33 722,180.92 722,205.72 " fill="none" id="set_choice-replace_choice" style="stroke: #A80036; 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>> \ No newline at end of file
>> diff --git a/Documentation/filesystems/xfs-larp-state.txt b/Documentation/filesystems/xfs-larp-state.txt
>> new file mode 100644
>> index 000000000000..7a54773665a6
>> --- /dev/null
>> +++ b/Documentation/filesystems/xfs-larp-state.txt
>> @@ -0,0 +1,103 @@
>> +/'
>> +PlantUML documentation:
>> +Getting started - https://urldefense.com/v3/__https://plantuml.com/starting__;!!ACWV5N9M2RV99hQ!LDEJoEDq2pEhYtShm1MXlRKD6paDImDEh6fStpQyT2X30noPrJapiZFemV84GuLCllcrM0Zr0mFPSIIZ7L4$  
>> +State diagram - https://urldefense.com/v3/__https://plantuml.com/state-diagram__;!!ACWV5N9M2RV99hQ!LDEJoEDq2pEhYtShm1MXlRKD6paDImDEh6fStpQyT2X30noPrJapiZFemV84GuLCllcrM0Zr0mFPHMQXKGQ$  
>> +'/
>> +
>> +@startuml
>> +
>> +state REMOTE_ADD {
>> +	XFS_DAS_..._SET_RMT : find space for remote blocks
>> +	XFS_DAS_..._ALLOC_RMT : allocate blocks and set remote value
>> +
>> +	XFS_DAS_..._SET_RMT --> XFS_DAS_..._ALLOC_RMT
>> +}
>> +
>> +state ADD {
>> +	XFS_DAS_SF_ADD : add attr to shortform fork
>> +	XFS_DAS_LEAF_ADD : add attr to inode in leaf form
>> +	XFS_DAS_NODE_ADD : add attr to node format attribute tree
>> +
>> +	state add_entry <<entryPoint>>
>> +	state add_form <<choice>>
>> +	add_entry --> add_form
>> +	add_form --> XFS_DAS_SF_ADD : short form
>> +	add_form --> XFS_DAS_LEAF_ADD : leaf form
>> +	add_form --> XFS_DAS_NODE_ADD : node form
>> +
>> +	XFS_DAS_SF_ADD --> XFS_DAS_LEAF_ADD : Full or too large
>> +	XFS_DAS_LEAF_ADD --> XFS_DAS_NODE_ADD : full or too large
>> +
>> +	XFS_DAS_LEAF_ADD --> XFS_DAS_..._SET_RMT : remote xattr
>> +	XFS_DAS_NODE_ADD --> XFS_DAS_..._SET_RMT : remote xattr
>> +}
>> +
>> +state REMOVE {
>> +	XFS_DAS_SF_REMOVE : remove attr from shortform fork
>> +	XFS_DAS_LEAF_REMOVE : remove attr from an inode in leaf form
>> +	XFS_DAS_NODE_REMOVE : setup for removal
>> +	XFS_DAS_NODE_REMOVE : (attr exists and blocks are valid)
>> +
>> +	state remove_entry <<entryPoint>>
>> +	state remove_form <<choice>>
>> +	remove_entry --> remove_form
>> +	remove_form --> XFS_DAS_SF_REMOVE : short form
>> +	remove_form --> XFS_DAS_LEAF_REMOVE : leaf form
>> +	remove_form --> XFS_DAS_NODE_REMOVE : node form
>> +}
>> +
>> +state REPLACE {
>> +	state replace_choice <<choice>>
>> +	replace_choice --> add_entry : larp disable
>> +	replace_choice --> remove_entry : larp enabled
>> +}
>> +
>> +
>> +state OLD_REPLACE {
>> +	XFS_DAS_..._REPLACE : atomic INCOMPLETE flag flip
>> +	XFS_DAS_..._REMOVE_OLD : restore original xattr state for remove
>> +	XFS_DAS_..._REMOVE_OLD : invalidate old xattr
>> +
>> +	XFS_DAS_..._REPLACE --> XFS_DAS_..._REMOVE_OLD
>> +}
>> +
>> +state REMOVE_XATTR {
>> +	XFS_DAS_..._REMOVE_RMT : remove remote attribute blocks
>> +	XFS_DAS_..._REMOVE_ATTR : remove attribute name from leaf/node block
>> +
>> +	state remove_xattr_choice <<choice>>
>> +	remove_xattr_choice --> XFS_DAS_..._REMOVE_RMT : Remote xattr
>> +	remove_xattr_choice --> XFS_DAS_..._REMOVE_ATTR : Local xattr
>> +
>> +	XFS_DAS_..._REMOVE_RMT --> XFS_DAS_..._REMOVE_ATTR
>> +}
>> +
>> +state XFS_DAS_DONE {
>> +}
>> +
>> +state add_done <<choice>>
>> +add_done -down-> XFS_DAS_DONE : Operation Complete
>> +add_done -up-> XFS_DAS_..._REPLACE : LARP disabled REPLACE
>> +XFS_DAS_SF_ADD -down-> add_done : Success
>> +XFS_DAS_LEAF_ADD -down-> add_done : Success
>> +XFS_DAS_NODE_ADD -down-> add_done : Success
>> +XFS_DAS_..._ALLOC_RMT -down-> add_done : Success
>> +
>> +state remove_done <<choice>>
>> +remove_done -down-> XFS_DAS_DONE : Operation Complete
>> +remove_done -up-> add_entry : LARP enabled REPLACE
>> +XFS_DAS_SF_REMOVE -down-> remove_done : Success
>> +XFS_DAS_LEAF_REMOVE -down-> remove_done : Success
>> +XFS_DAS_NODE_REMOVE -down-> remove_done : Success
>> +XFS_DAS_..._REMOVE_ATTR -down-> remove_done : Success
>> +
>> +XFS_DAS_..._REMOVE_OLD --> remove_xattr_choice
>> +XFS_DAS_NODE_REMOVE --> remove_xattr_choice
>> +
>> +state set_choice <<choice>>
>> +[*] --> set_choice
>> +set_choice --> add_entry : add new
>> +set_choice --> remove_entry : remove existing
>> +set_choice --> replace_choice : replace existing
>> +XFS_DAS_DONE --> [*]
>> +@enduml
>> -- 
>> 2.25.1
>>
diff mbox series

Patch

diff --git a/Documentation/filesystems/xfs-larp-state.svg b/Documentation/filesystems/xfs-larp-state.svg
new file mode 100644
index 000000000000..d93078300d91
--- /dev/null
+++ b/Documentation/filesystems/xfs-larp-state.svg
@@ -0,0 +1 @@ 
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stroke-width: 1.5;" x1="230.5" x2="429.5" y1="987.2969" y2="987.2969"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="153" x="253.5" y="978.9951">XFS_DAS_..._SET_RMT</text><text fill="#000000" font-family="sans-serif" font-size="12" lengthAdjust="spacingAndGlyphs" textLength="179" x="235.5" y="1003.4355">find space for remote blocks</text><rect fill="#FEFECE" filter="url(#fc2ynpqha1fpc)" height="50.2656" rx="12.5" ry="12.5" style="stroke: #A80036; stroke-width: 1.5;" width="252" x="204" y="1090"/><line style="stroke: #A80036; stroke-width: 1.5;" x1="204" x2="456" y1="1116.2969" y2="1116.2969"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="170" x="245" y="1107.9951">XFS_DAS_..._ALLOC_RMT</text><text fill="#000000" font-family="sans-serif" font-size="12" lengthAdjust="spacingAndGlyphs" textLength="232" x="209" y="1132.4355">allocate blocks and set remote value</text><rect fill="#FEFECE" filter="url(#fc2ynpqha1fpc)" height="50.2656" rx="12.5" ry="12.5" style="stroke: #A80036; stroke-width: 1.5;" width="181" x="96.5" y="542"/><line style="stroke: #A80036; stroke-width: 1.5;" x1="96.5" x2="277.5" y1="568.2969" y2="568.2969"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="124" x="125" y="559.9951">XFS_DAS_SF_ADD</text><text fill="#000000" font-family="sans-serif" font-size="12" lengthAdjust="spacingAndGlyphs" textLength="161" x="101.5" y="584.4355">add attr to shortform fork</text><rect fill="#FEFECE" filter="url(#fc2ynpqha1fpc)" height="50.2656" rx="12.5" ry="12.5" style="stroke: #A80036; stroke-width: 1.5;" width="201" x="205.5" y="686"/><line style="stroke: #A80036; stroke-width: 1.5;" x1="205.5" x2="406.5" y1="712.2969" y2="712.2969"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="140" x="236" y="703.9951">XFS_DAS_LEAF_ADD</text><text fill="#000000" font-family="sans-serif" font-size="12" lengthAdjust="spacingAndGlyphs" textLength="181" x="210.5" y="728.4355">add attr to inode in leaf form</text><rect fill="#FEFECE" filter="url(#fc2ynpqha1fpc)" height="50.2656" rx="12.5" ry="12.5" style="stroke: #A80036; stroke-width: 1.5;" width="258" x="59" y="813"/><line style="stroke: #A80036; stroke-width: 1.5;" x1="59" x2="317" y1="839.2969" y2="839.2969"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="148" x="114" y="830.9951">XFS_DAS_NODE_ADD</text><text fill="#000000" font-family="sans-serif" font-size="12" lengthAdjust="spacingAndGlyphs" textLength="238" x="64" y="855.4355">add attr to node format attribute tree</text><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="68" x="375" y="298.6982">add_entry</text><ellipse cx="409" cy="320" fill="#FEFECE" rx="6" ry="6" style="stroke: #A80036; stroke-width: 1.5;"/><polygon fill="#FEFECE" filter="url(#fc2ynpqha1fpc)" points="289,421,301,433,289,445,277,433,289,421" style="stroke: #A80036; stroke-width: 1.5;"/><rect fill="#FEFECE" filter="url(#fc2ynpqha1fpc)" height="50.2656" rx="12.5" ry="12.5" style="stroke: #A80036; stroke-width: 1.5;" width="218" x="1318" y="542"/><line style="stroke: #A80036; stroke-width: 1.5;" x1="1318" x2="1536" y1="568.2969" y2="568.2969"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="153" x="1350.5" y="559.9951">XFS_DAS_SF_REMOVE</text><text fill="#000000" font-family="sans-serif" font-size="12" lengthAdjust="spacingAndGlyphs" textLength="198" x="1323" y="584.4355">remove attr from shortform fork</text><rect fill="#FEFECE" filter="url(#fc2ynpqha1fpc)" height="50.2656" rx="12.5" ry="12.5" style="stroke: #A80036; stroke-width: 1.5;" width="258" x="1571" y="542"/><line style="stroke: #A80036; stroke-width: 1.5;" x1="1571" x2="1829" y1="568.2969" y2="568.2969"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="169" x="1615.5" y="559.9951">XFS_DAS_LEAF_REMOVE</text><text fill="#000000" font-family="sans-serif" font-size="12" lengthAdjust="spacingAndGlyphs" textLength="238" x="1576" y="584.4355">remove attr from an inode in leaf form</text><rect fill="#FEFECE" filter="url(#fc2ynpqha1fpc)" height="64.2344" rx="12.5" ry="12.5" style="stroke: #A80036; stroke-width: 1.5;" width="222" x="1061" y="535"/><line style="stroke: #A80036; stroke-width: 1.5;" x1="1061" x2="1283" y1="561.2969" y2="561.2969"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="177" x="1083.5" y="552.9951">XFS_DAS_NODE_REMOVE</text><text fill="#000000" font-family="sans-serif" font-size="12" lengthAdjust="spacingAndGlyphs" textLength="110" x="1066" y="577.4355">setup for removal</text><text fill="#000000" font-family="sans-serif" font-size="12" lengthAdjust="spacingAndGlyphs" textLength="202" x="1066" y="591.4043">(attr exists and blocks are valid)</text><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="94" x="1012" y="298.6982">remove_entry</text><ellipse cx="1059" cy="320" fill="#FEFECE" rx="6" ry="6" style="stroke: #A80036; stroke-width: 1.5;"/><polygon fill="#FEFECE" filter="url(#fc2ynpqha1fpc)" points="1299,421,1311,433,1299,445,1287,433,1299,421" style="stroke: #A80036; stroke-width: 1.5;"/><polygon fill="#FEFECE" filter="url(#fc2ynpqha1fpc)" points="722,211,734,223,722,235,710,223,722,211" style="stroke: #A80036; stroke-width: 1.5;"/><rect fill="#FEFECE" filter="url(#fc2ynpqha1fpc)" height="50.2656" rx="12.5" ry="12.5" style="stroke: #A80036; stroke-width: 1.5;" width="191" x="771.5" y="408"/><line style="stroke: #A80036; stroke-width: 1.5;" x1="771.5" x2="962.5" y1="434.2969" y2="434.2969"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="151" x="791.5" y="425.9951">XFS_DAS_..._REPLACE</text><text fill="#000000" font-family="sans-serif" font-size="12" lengthAdjust="spacingAndGlyphs" textLength="171" x="776.5" y="450.4355">atomic INCOMPLETE flag flip</text><rect fill="#FEFECE" filter="url(#fc2ynpqha1fpc)" height="64.2344" rx="12.5" ry="12.5" style="stroke: #A80036; stroke-width: 1.5;" width="257" x="755.5" y="535"/><line style="stroke: #A80036; stroke-width: 1.5;" x1="755.5" x2="1012.5" y1="561.2969" y2="561.2969"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="184" x="792" y="552.9951">XFS_DAS_..._REMOVE_OLD</text><text fill="#000000" font-family="sans-serif" font-size="12" lengthAdjust="spacingAndGlyphs" textLength="237" x="760.5" y="577.4355">restore original xattr state for remove</text><text fill="#000000" font-family="sans-serif" font-size="12" lengthAdjust="spacingAndGlyphs" textLength="116" x="760.5" y="591.4043">invalidate old xattr</text><rect fill="#FEFECE" filter="url(#fc2ynpqha1fpc)" height="50.2656" rx="12.5" ry="12.5" style="stroke: #A80036; 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stroke-width: 1.5;" x1="652" x2="782" y1="1346.2969" y2="1346.2969"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="110" x="662" y="1337.9951">XFS_DAS_DONE</text><!--link XFS_DAS_..._SET_RMT to XFS_DAS_..._ALLOC_RMT--><path d="M330,1011.19 C330,1032.11 330,1062.41 330,1084.71 " fill="none" id="XFS_DAS_..._SET_RMT-XFS_DAS_..._ALLOC_RMT" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="330,1089.9,334,1080.9,330,1084.9,326,1080.9,330,1089.9" style="stroke: #A80036; stroke-width: 1.0;"/><!--link add_entry to add_form--><path d="M405.01,324.69 C388.25,340.2 323.3,400.28 298.6,423.12 " fill="none" id="add_entry-add_form" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="294.74,426.69,304.0612,423.5096,298.4085,423.2927,298.6255,417.64,294.74,426.69" style="stroke: #A80036; stroke-width: 1.0;"/><!--link add_form to XFS_DAS_SF_ADD--><path d="M284.08,440.37 C270.71,457.67 233.1,506.34 208.81,537.78 " fill="none" id="add_form-XFS_DAS_SF_ADD" style="stroke: #A80036; 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stroke-width: 1.0;"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="67" x="1367" y="501.0669">short form</text><!--link remove_form to XFS_DAS_LEAF_REMOVE--><path d="M1307.38,436.76 C1347.18,449.86 1519.53,506.59 1622.18,540.38 " fill="none" id="remove_form-XFS_DAS_LEAF_REMOVE" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="1627.01,541.97,1619.7068,535.3622,1622.2595,540.4103,1617.2113,542.963,1627.01,541.97" style="stroke: #A80036; stroke-width: 1.0;"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="57" x="1512" y="501.0669">leaf form</text><!--link remove_form to XFS_DAS_NODE_REMOVE--><path d="M1293.54,439.67 C1278.62,455.18 1236.24,499.23 1205.72,530.96 " fill="none" id="remove_form-XFS_DAS_NODE_REMOVE" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="1202.06,534.76,1211.1866,531.0579,1205.5307,531.1608,1205.4278,525.5049,1202.06,534.76" style="stroke: #A80036; stroke-width: 1.0;"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="66" x="1247" y="501.0669">node form</text><!--link replace_choice to add_entry--><path d="M715.58,229 C700.21,240.69 659.7,269.88 621,284 C547.76,310.72 452.81,317.14 420.41,318.6 " fill="none" id="replace_choice-add_entry" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="415.11,318.81,424.273,322.421,420.1054,318.5959,423.9305,314.4283,415.11,318.81" style="stroke: #A80036; stroke-width: 1.0;"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="73" x="657" y="280.0669">larp disable</text><!--link replace_choice to remove_entry--><path d="M730.32,226.84 C756.8,235.83 841.65,264.27 913,284 C963.24,297.89 1024.07,311.44 1048.3,316.7 " fill="none" id="replace_choice-remove_entry" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="1053.39,317.8,1045.4395,311.9871,1048.5031,316.7426,1043.7476,319.8062,1053.39,317.8" style="stroke: #A80036; stroke-width: 1.0;"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="79" x="914" y="280.0669">larp enabled</text><!--link XFS_DAS_..._REPLACE to XFS_DAS_..._REMOVE_OLD--><path d="M870.12,458.21 C872.7,478.28 876.41,507.1 879.35,529.89 " fill="none" id="XFS_DAS_..._REPLACE-XFS_DAS_..._REMOVE_OLD" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="880,534.95,882.8093,525.5103,879.357,529.9915,874.8758,526.5392,880,534.95" style="stroke: #A80036; stroke-width: 1.0;"/><!--link remove_xattr_choice to XFS_DAS_..._REMOVE_RMT--><path d="M1101.74,718.03 C1087.66,734.18 1048.4,779.2 1022.42,809 " fill="none" id="remove_xattr_choice-XFS_DAS_..._REMOVE_RMT" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="1019,812.91,1027.9279,808.7516,1022.2844,809.14,1021.896,803.4965,1019,812.91" style="stroke: #A80036; stroke-width: 1.0;"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="84" x="1060" y="779.0669">Remote xattr</text><!--link remove_xattr_choice to XFS_DAS_..._REMOVE_ATTR--><path d="M1113.32,716.81 C1123.94,725.33 1145,744.27 1153,766 C1155.61,773.09 1154,775.51 1153,783 C1144.59,845.92 1122.05,917.01 1108.58,955.84 " fill="none" id="remove_xattr_choice-XFS_DAS_..._REMOVE_ATTR" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="1106.82,960.87,1113.5521,953.6812,1108.4609,956.1469,1105.9952,951.0557,1106.82,960.87" style="stroke: #A80036; stroke-width: 1.0;"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="67" x="1148" y="842.5669">Local xattr</text><!--link XFS_DAS_..._REMOVE_RMT to XFS_DAS_..._REMOVE_ATTR--><path d="M1014.51,863.11 C1032.1,888.79 1059.92,929.4 1078.55,956.61 " fill="none" id="XFS_DAS_..._REMOVE_RMT-XFS_DAS_..._REMOVE_ATTR" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="1081.46,960.86,1079.6731,951.1746,1078.634,956.7352,1073.0734,955.6962,1081.46,960.86" style="stroke: #A80036; stroke-width: 1.0;"/><!--link add_done to XFS_DAS_DONE--><path d="M432.14,1235.11 C463.07,1246.94 575.27,1289.82 649.28,1318.11 " fill="none" id="add_done-XFS_DAS_DONE" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="654.1,1319.95,647.1215,1313.0001,649.4296,1318.1647,644.265,1320.4727,654.1,1319.95" style="stroke: #A80036; stroke-width: 1.0;"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="129" x="571" y="1286.0669">Operation Complete</text><!--link XFS_DAS_..._REPLACE to add_done--><path d="M793.93,460.12 C749.79,481.09 702,515.46 702,566 C702,566 702,566 702,902.5 C702,1037.15 636.85,1061.95 549,1164 C516.18,1202.13 455.77,1221.51 433,1227.73 " fill="none" id="XFS_DAS_..._REPLACE-add_done" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="798.46,458.01,788.6128,458.1929,793.9294,460.1252,791.9972,465.4418,798.46,458.01" style="stroke: #A80036; stroke-width: 1.0;"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="150" x="703" y="842.5669">LARP disabled REPLACE</text><!--link XFS_DAS_SF_ADD to add_done--><path d="M114.94,592.05 C64.47,613.96 6,651.89 6,710 C6,710 6,710 6,1116 C6,1201.03 331.99,1224.78 408.2,1229.18 " fill="none" id="XFS_DAS_SF_ADD-add_done" style="stroke: #A80036; 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stroke-width: 1.0;"/><polygon fill="#A80036" points="413.01,1229.87,404.1523,1225.564,408.0129,1229.6987,403.8782,1233.5593,413.01,1229.87" style="stroke: #A80036; stroke-width: 1.0;"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="53" x="134" y="1056.0669">Success</text><!--link XFS_DAS_..._ALLOC_RMT to add_done--><path d="M349.93,1140.18 C370.21,1164.76 400.66,1201.7 415.4,1219.57 " fill="none" id="XFS_DAS_..._ALLOC_RMT-add_done" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="418.8,1223.69,416.1738,1214.1977,415.6245,1219.8279,409.9943,1219.2786,418.8,1223.69" style="stroke: #A80036; stroke-width: 1.0;"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="53" x="389" y="1185.0669">Success</text><!--link remove_done to XFS_DAS_DONE--><path d="M1234.17,1119.4 C1183.73,1141.3 902.74,1263.34 777.39,1317.77 " fill="none" id="remove_done-XFS_DAS_DONE" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="772.63,1319.84,782.4784,1319.9343,777.2183,1317.8532,779.2995,1312.5931,772.63,1319.84" style="stroke: #A80036; stroke-width: 1.0;"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="129" x="997" y="1235.5669">Operation Complete</text><!--link add_entry to remove_done--><path d="M418.16,326.32 C441.07,340.4 499,381.04 499,432 C499,432 499,432 499,640.5 C499,684.61 504.38,697.56 526,736 C625.8,913.44 687.15,951.91 873,1035 C1006.08,1094.49 1186.57,1110.25 1231.53,1113.35 " fill="none" id="add_entry-remove_done" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="413.84,323.73,419.4797,331.8043,418.1212,326.313,423.6125,324.9544,413.84,323.73" style="stroke: #A80036; stroke-width: 1.0;"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="148" x="527" y="715.5669">LARP enabled REPLACE</text><!--link XFS_DAS_SF_REMOVE to remove_done--><path d="M1430.83,592.05 C1434.97,620.23 1441,668.38 1441,710 C1441,710 1441,710 1441,987 C1441,1074.24 1303.43,1104.2 1257.06,1111.83 " fill="none" id="XFS_DAS_SF_REMOVE-remove_done" style="stroke: #A80036; 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stroke-width: 1.0;"/><polygon fill="#A80036" points="1248.06,1108.6,1257.3489,1105.3263,1251.6943,1105.166,1251.8545,1099.5115,1248.06,1108.6" style="stroke: #A80036; stroke-width: 1.0;"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="53" x="1317" y="842.5669">Success</text><!--link XFS_DAS_..._REMOVE_ATTR to remove_done--><path d="M1125.42,1011.19 C1157.86,1039.79 1210.2,1085.95 1231.98,1105.17 " fill="none" id="XFS_DAS_..._REMOVE_ATTR-remove_done" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="1235.92,1108.64,1231.8338,1099.6788,1232.1767,1105.3253,1226.5302,1105.6682,1235.92,1108.64" style="stroke: #A80036; stroke-width: 1.0;"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="53" x="1179" y="1056.0669">Success</text><!--link XFS_DAS_..._REMOVE_OLD to remove_xattr_choice--><path d="M932.94,599.16 C985.76,632.8 1066.27,684.06 1095.71,702.81 " fill="none" id="XFS_DAS_..._REMOVE_OLD-remove_xattr_choice" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="1099.99,705.53,1094.5499,697.3199,1095.7735,702.8428,1090.2505,704.0664,1099.99,705.53" style="stroke: #A80036; stroke-width: 1.0;"/><!--link XFS_DAS_NODE_REMOVE to remove_xattr_choice--><path d="M1157.74,599.16 C1143.62,630 1122.72,675.66 1112.73,697.49 " fill="none" id="XFS_DAS_NODE_REMOVE-remove_xattr_choice" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="1110.54,702.26,1117.9134,695.7306,1112.6144,697.7106,1110.6344,692.4116,1110.54,702.26" style="stroke: #A80036; stroke-width: 1.0;"/><!--link *start to set_choice--><path d="M722,28.29 C722,41.73 722,66.81 722,83.45 " fill="none" id="*start-set_choice" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="722,88.75,726,79.75,722,83.75,718,79.75,722,88.75" style="stroke: #A80036; stroke-width: 1.0;"/><!--link set_choice to add_entry--><path d="M715.46,106.53 C675.48,134.25 464.17,280.75 417.94,312.8 " fill="none" id="set_choice-add_entry" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="413.56,315.84,423.2339,313.9919,417.6668,312.988,418.6707,307.421,413.56,315.84" style="stroke: #A80036; stroke-width: 1.0;"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="53" x="627" y="227.5669">add new</text><!--link set_choice to remove_entry--><path d="M730.92,104.39 C750.14,109.72 796.57,123.68 832,143 C926.76,194.66 1023.54,284.76 1051.19,311.39 " fill="none" id="set_choice-remove_entry" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="1055.03,315.1,1051.3279,305.9734,1051.4308,311.6293,1045.7749,311.7322,1055.03,315.1" style="stroke: #A80036; stroke-width: 1.0;"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="102" x="994" y="227.5669">remove existing</text><!--link set_choice to replace_choice--><path d="M722,113.07 C722,134.33 722,180.92 722,205.72 " fill="none" id="set_choice-replace_choice" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="722,210.95,726,201.95,722,205.95,718,201.95,722,210.95" style="stroke: #A80036; stroke-width: 1.0;"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="100" x="723" y="156.0669">replace existing</text><!--link XFS_DAS_DONE to *end--><path d="M717,1370.21 C717,1387.84 717,1411.13 717,1425.84 " fill="none" id="XFS_DAS_DONE-*end" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="717,1430.84,721,1421.84,717,1425.84,713,1421.84,717,1430.84" style="stroke: #A80036; stroke-width: 1.0;"/></g></svg>
\ No newline at end of file
diff --git a/Documentation/filesystems/xfs-larp-state.txt b/Documentation/filesystems/xfs-larp-state.txt
new file mode 100644
index 000000000000..7a54773665a6
--- /dev/null
+++ b/Documentation/filesystems/xfs-larp-state.txt
@@ -0,0 +1,103 @@ 
+/'
+PlantUML documentation:
+Getting started - https://plantuml.com/starting
+State diagram - https://plantuml.com/state-diagram
+'/
+
+@startuml
+
+state REMOTE_ADD {
+	XFS_DAS_..._SET_RMT : find space for remote blocks
+	XFS_DAS_..._ALLOC_RMT : allocate blocks and set remote value
+
+	XFS_DAS_..._SET_RMT --> XFS_DAS_..._ALLOC_RMT
+}
+
+state ADD {
+	XFS_DAS_SF_ADD : add attr to shortform fork
+	XFS_DAS_LEAF_ADD : add attr to inode in leaf form
+	XFS_DAS_NODE_ADD : add attr to node format attribute tree
+
+	state add_entry <<entryPoint>>
+	state add_form <<choice>>
+	add_entry --> add_form
+	add_form --> XFS_DAS_SF_ADD : short form
+	add_form --> XFS_DAS_LEAF_ADD : leaf form
+	add_form --> XFS_DAS_NODE_ADD : node form
+
+	XFS_DAS_SF_ADD --> XFS_DAS_LEAF_ADD : Full or too large
+	XFS_DAS_LEAF_ADD --> XFS_DAS_NODE_ADD : full or too large
+
+	XFS_DAS_LEAF_ADD --> XFS_DAS_..._SET_RMT : remote xattr
+	XFS_DAS_NODE_ADD --> XFS_DAS_..._SET_RMT : remote xattr
+}
+
+state REMOVE {
+	XFS_DAS_SF_REMOVE : remove attr from shortform fork
+	XFS_DAS_LEAF_REMOVE : remove attr from an inode in leaf form
+	XFS_DAS_NODE_REMOVE : setup for removal
+	XFS_DAS_NODE_REMOVE : (attr exists and blocks are valid)
+
+	state remove_entry <<entryPoint>>
+	state remove_form <<choice>>
+	remove_entry --> remove_form
+	remove_form --> XFS_DAS_SF_REMOVE : short form
+	remove_form --> XFS_DAS_LEAF_REMOVE : leaf form
+	remove_form --> XFS_DAS_NODE_REMOVE : node form
+}
+
+state REPLACE {
+	state replace_choice <<choice>>
+	replace_choice --> add_entry : larp disable
+	replace_choice --> remove_entry : larp enabled
+}
+
+
+state OLD_REPLACE {
+	XFS_DAS_..._REPLACE : atomic INCOMPLETE flag flip
+	XFS_DAS_..._REMOVE_OLD : restore original xattr state for remove
+	XFS_DAS_..._REMOVE_OLD : invalidate old xattr
+
+	XFS_DAS_..._REPLACE --> XFS_DAS_..._REMOVE_OLD
+}
+
+state REMOVE_XATTR {
+	XFS_DAS_..._REMOVE_RMT : remove remote attribute blocks
+	XFS_DAS_..._REMOVE_ATTR : remove attribute name from leaf/node block
+
+	state remove_xattr_choice <<choice>>
+	remove_xattr_choice --> XFS_DAS_..._REMOVE_RMT : Remote xattr
+	remove_xattr_choice --> XFS_DAS_..._REMOVE_ATTR : Local xattr
+
+	XFS_DAS_..._REMOVE_RMT --> XFS_DAS_..._REMOVE_ATTR
+}
+
+state XFS_DAS_DONE {
+}
+
+state add_done <<choice>>
+add_done -down-> XFS_DAS_DONE : Operation Complete
+add_done -up-> XFS_DAS_..._REPLACE : LARP disabled REPLACE
+XFS_DAS_SF_ADD -down-> add_done : Success
+XFS_DAS_LEAF_ADD -down-> add_done : Success
+XFS_DAS_NODE_ADD -down-> add_done : Success
+XFS_DAS_..._ALLOC_RMT -down-> add_done : Success
+
+state remove_done <<choice>>
+remove_done -down-> XFS_DAS_DONE : Operation Complete
+remove_done -up-> add_entry : LARP enabled REPLACE
+XFS_DAS_SF_REMOVE -down-> remove_done : Success
+XFS_DAS_LEAF_REMOVE -down-> remove_done : Success
+XFS_DAS_NODE_REMOVE -down-> remove_done : Success
+XFS_DAS_..._REMOVE_ATTR -down-> remove_done : Success
+
+XFS_DAS_..._REMOVE_OLD --> remove_xattr_choice
+XFS_DAS_NODE_REMOVE --> remove_xattr_choice
+
+state set_choice <<choice>>
+[*] --> set_choice
+set_choice --> add_entry : add new
+set_choice --> remove_entry : remove existing
+set_choice --> replace_choice : replace existing
+XFS_DAS_DONE --> [*]
+@enduml