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${ item.name }
Create tag ${ searchTerm }
Create branch ${ searchTerm }
from '7d761777a4'
${ noResults }
mergerfs/config/rename_and_link/index.html

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<!doctype html>
<html lang="en" class="no-js">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width,initial-scale=1">
<meta name="description" content="mergerfs - a featureful union filesystem">
<link rel="canonical" href="https://trapexit.github.io/mergerfs/config/rename_and_link/">
<link rel="prev" href="../func_readdir/">
<link rel="next" href="../cache/">
<link rel="icon" href="../../assets/images/favicon.png">
<meta name="generator" content="mkdocs-1.6.1, mkdocs-material-9.5.49">
<title>rename and link - mergerfs</title>
<link rel="stylesheet" href="../../assets/stylesheets/main.6f8fc17f.min.css">
<link rel="stylesheet" href="../../assets/stylesheets/palette.06af60db.min.css">
<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Roboto:300,300i,400,400i,700,700i%7CRoboto+Mono:400,400i,700,700i&display=fallback">
<style>:root{--md-text-font:"Roboto";--md-code-font:"Roboto Mono"}</style>
<script>__md_scope=new URL("../..",location),__md_hash=e=>[...e].reduce(((e,_)=>(e<<5)-e+_.charCodeAt(0)),0),__md_get=(e,_=localStorage,t=__md_scope)=>JSON.parse(_.getItem(t.pathname+"."+e)),__md_set=(e,_,t=localStorage,a=__md_scope)=>{try{t.setItem(a.pathname+"."+e,JSON.stringify(_))}catch(e){}}</script>
</head>
<body dir="ltr" data-md-color-scheme="default" data-md-color-primary="indigo" data-md-color-accent="indigo">
<input class="md-toggle" data-md-toggle="drawer" type="checkbox" id="__drawer" autocomplete="off">
<input class="md-toggle" data-md-toggle="search" type="checkbox" id="__search" autocomplete="off">
<label class="md-overlay" for="__drawer"></label>
<div data-md-component="skip">
<a href="#rename-and-link" class="md-skip">
Skip to content
</a>
</div>
<div data-md-component="announce">
</div>
<header class="md-header md-header--shadow" data-md-component="header">
<nav class="md-header__inner md-grid" aria-label="Header">
<a href="../.." title="mergerfs" class="md-header__button md-logo" aria-label="mergerfs" data-md-component="logo">
<img src="../../logo.jpeg" alt="logo">
</a>
<label class="md-header__button md-icon" for="__drawer">
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M3 6h18v2H3zm0 5h18v2H3zm0 5h18v2H3z"/></svg>
</label>
<div class="md-header__title" data-md-component="header-title">
<div class="md-header__ellipsis">
<div class="md-header__topic">
<span class="md-ellipsis">
mergerfs
</span>
</div>
<div class="md-header__topic" data-md-component="header-topic">
<span class="md-ellipsis">
rename and link
</span>
</div>
</div>
</div>
<form class="md-header__option" data-md-component="palette">
<input class="md-option" data-md-color-media="(prefers-color-scheme)" data-md-color-scheme="default" data-md-color-primary="indigo" data-md-color-accent="indigo" aria-label="Switch to light mode" type="radio" name="__palette" id="__palette_0">
<label class="md-header__button md-icon" title="Switch to light mode" for="__palette_1" hidden>
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</label>
<input class="md-option" data-md-color-media="(prefers-color-scheme: light)" data-md-color-scheme="default" data-md-color-primary="indigo" data-md-color-accent="indigo" aria-label="Switch to dark mode" type="radio" name="__palette" id="__palette_1">
<label class="md-header__button md-icon" title="Switch to dark mode" for="__palette_2" hidden>
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M12 8a4 4 0 0 0-4 4 4 4 0 0 0 4 4 4 4 0 0 0 4-4 4 4 0 0 0-4-4m0 10a6 6 0 0 1-6-6 6 6 0 0 1 6-6 6 6 0 0 1 6 6 6 6 0 0 1-6 6m8-9.31V4h-4.69L12 .69 8.69 4H4v4.69L.69 12 4 15.31V20h4.69L12 23.31 15.31 20H20v-4.69L23.31 12z"/></svg>
</label>
<input class="md-option" data-md-color-media="(prefers-color-scheme: dark)" data-md-color-scheme="slate" data-md-color-primary="indigo" data-md-color-accent="indigo" aria-label="Switch to system preference" type="radio" name="__palette" id="__palette_2">
<label class="md-header__button md-icon" title="Switch to system preference" for="__palette_0" hidden>
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M12 18c-.89 0-1.74-.2-2.5-.55C11.56 16.5 13 14.42 13 12s-1.44-4.5-3.5-5.45C10.26 6.2 11.11 6 12 6a6 6 0 0 1 6 6 6 6 0 0 1-6 6m8-9.31V4h-4.69L12 .69 8.69 4H4v4.69L.69 12 4 15.31V20h4.69L12 23.31 15.31 20H20v-4.69L23.31 12z"/></svg>
</label>
</form>
<script>var palette=__md_get("__palette");if(palette&&palette.color){if("(prefers-color-scheme)"===palette.color.media){var media=matchMedia("(prefers-color-scheme: light)"),input=document.querySelector(media.matches?"[data-md-color-media='(prefers-color-scheme: light)']":"[data-md-color-media='(prefers-color-scheme: dark)']");palette.color.media=input.getAttribute("data-md-color-media"),palette.color.scheme=input.getAttribute("data-md-color-scheme"),palette.color.primary=input.getAttribute("data-md-color-primary"),palette.color.accent=input.getAttribute("data-md-color-accent")}for(var[key,value]of Object.entries(palette.color))document.body.setAttribute("data-md-color-"+key,value)}</script>
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</label>
<div class="md-search" data-md-component="search" role="dialog">
<label class="md-search__overlay" for="__search"></label>
<div class="md-search__inner" role="search">
<form class="md-search__form" name="search">
<input type="text" class="md-search__input" name="query" aria-label="Search" placeholder="Search" autocapitalize="off" autocorrect="off" autocomplete="off" spellcheck="false" data-md-component="search-query" required>
<label class="md-search__icon md-icon" for="__search">
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M9.5 3A6.5 6.5 0 0 1 16 9.5c0 1.61-.59 3.09-1.56 4.23l.27.27h.79l5 5-1.5 1.5-5-5v-.79l-.27-.27A6.52 6.52 0 0 1 9.5 16 6.5 6.5 0 0 1 3 9.5 6.5 6.5 0 0 1 9.5 3m0 2C7 5 5 7 5 9.5S7 14 9.5 14 14 12 14 9.5 12 5 9.5 5"/></svg>
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</label>
<nav class="md-search__options" aria-label="Search">
<a href="javascript:void(0)" class="md-search__icon md-icon" title="Share" aria-label="Share" data-clipboard data-clipboard-text="" data-md-component="search-share" tabindex="-1">
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</a>
<button type="reset" class="md-search__icon md-icon" title="Clear" aria-label="Clear" tabindex="-1">
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M19 6.41 17.59 5 12 10.59 6.41 5 5 6.41 10.59 12 5 17.59 6.41 19 12 13.41 17.59 19 19 17.59 13.41 12z"/></svg>
</button>
</nav>
</form>
<div class="md-search__output">
<div class="md-search__scrollwrap" tabindex="0" data-md-scrollfix>
<div class="md-search-result" data-md-component="search-result">
<div class="md-search-result__meta">
Initializing search
</div>
<ol class="md-search-result__list" role="presentation"></ol>
</div>
</div>
</div>
</div>
</div>
<div class="md-header__source">
<a href="https://github.com/trapexit/mergerfs" title="Go to repository" class="md-source" data-md-component="source">
<div class="md-source__icon md-icon">
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 512"><!--! Font Awesome Free 6.7.1 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license/free (Icons: CC BY 4.0, Fonts: SIL OFL 1.1, Code: MIT License) Copyright 2024 Fonticons, Inc.--><path d="M439.55 236.05 244 40.45a28.87 28.87 0 0 0-40.81 0l-40.66 40.63 51.52 51.52c27.06-9.14 52.68 16.77 43.39 43.68l49.66 49.66c34.23-11.8 61.18 31 35.47 56.69-26.49 26.49-70.21-2.87-56-37.34L240.22 199v121.85c25.3 12.54 22.26 41.85 9.08 55a34.34 34.34 0 0 1-48.55 0c-17.57-17.6-11.07-46.91 11.25-56v-123c-20.8-8.51-24.6-30.74-18.64-45L142.57 101 8.45 235.14a28.86 28.86 0 0 0 0 40.81l195.61 195.6a28.86 28.86 0 0 0 40.8 0l194.69-194.69a28.86 28.86 0 0 0 0-40.81"/></svg>
</div>
<div class="md-source__repository">
mergerfs
</div>
</a>
</div>
</nav>
</header>
<div class="md-container" data-md-component="container">
<main class="md-main" data-md-component="main">
<div class="md-main__inner md-grid">
<div class="md-sidebar md-sidebar--primary" data-md-component="sidebar" data-md-type="navigation" >
<div class="md-sidebar__scrollwrap">
<div class="md-sidebar__inner">
<nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
<label class="md-nav__title" for="__drawer">
<a href="../.." title="mergerfs" class="md-nav__button md-logo" aria-label="mergerfs" data-md-component="logo">
<img src="../../logo.jpeg" alt="logo">
</a>
mergerfs
</label>
<div class="md-nav__source">
<a href="https://github.com/trapexit/mergerfs" title="Go to repository" class="md-source" data-md-component="source">
<div class="md-source__icon md-icon">
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 512"><!--! Font Awesome Free 6.7.1 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license/free (Icons: CC BY 4.0, Fonts: SIL OFL 1.1, Code: MIT License) Copyright 2024 Fonticons, Inc.--><path d="M439.55 236.05 244 40.45a28.87 28.87 0 0 0-40.81 0l-40.66 40.63 51.52 51.52c27.06-9.14 52.68 16.77 43.39 43.68l49.66 49.66c34.23-11.8 61.18 31 35.47 56.69-26.49 26.49-70.21-2.87-56-37.34L240.22 199v121.85c25.3 12.54 22.26 41.85 9.08 55a34.34 34.34 0 0 1-48.55 0c-17.57-17.6-11.07-46.91 11.25-56v-123c-20.8-8.51-24.6-30.74-18.64-45L142.57 101 8.45 235.14a28.86 28.86 0 0 0 0 40.81l195.61 195.6a28.86 28.86 0 0 0 40.8 0l194.69-194.69a28.86 28.86 0 0 0 0-40.81"/></svg>
</div>
<div class="md-source__repository">
mergerfs
</div>
</a>
</div>
<ul class="md-nav__list" data-md-scrollfix>
<li class="md-nav__item">
<a href="../.." class="md-nav__link">
<span class="md-ellipsis">
Home
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../../quickstart/" class="md-nav__link">
<span class="md-ellipsis">
QuickStart
</span>
</a>
</li>
<li class="md-nav__item md-nav__item--nested">
<input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_3" >
<label class="md-nav__link" for="__nav_3" id="__nav_3_label" tabindex="0">
<span class="md-ellipsis">
Installation
</span>
<span class="md-nav__icon md-icon"></span>
</label>
<nav class="md-nav" data-md-level="1" aria-labelledby="__nav_3_label" aria-expanded="false">
<label class="md-nav__title" for="__nav_3">
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Installation
</label>
<ul class="md-nav__list" data-md-scrollfix>
<li class="md-nav__item">
<a href="../../setup/installation/" class="md-nav__link">
<span class="md-ellipsis">
Installation
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</li>
<li class="md-nav__item">
<a href="../../setup/upgrade/" class="md-nav__link">
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Upgrade
</span>
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</li>
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<a href="../../setup/build/" class="md-nav__link">
<span class="md-ellipsis">
Build
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item md-nav__item--active md-nav__item--nested">
<input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_4" checked>
<label class="md-nav__link" for="__nav_4" id="__nav_4_label" tabindex="0">
<span class="md-ellipsis">
Config
</span>
<span class="md-nav__icon md-icon"></span>
</label>
<nav class="md-nav" data-md-level="1" aria-labelledby="__nav_4_label" aria-expanded="true">
<label class="md-nav__title" for="__nav_4">
<span class="md-nav__icon md-icon"></span>
Config
</label>
<ul class="md-nav__list" data-md-scrollfix>
<li class="md-nav__item">
<a href="../terminology/" class="md-nav__link">
<span class="md-ellipsis">
Terminology
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../options/" class="md-nav__link">
<span class="md-ellipsis">
Options
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../deprecated_options/" class="md-nav__link">
<span class="md-ellipsis">
Deprecated Options
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../branches/" class="md-nav__link">
<span class="md-ellipsis">
branches
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../functions_categories_and_policies/" class="md-nav__link">
<span class="md-ellipsis">
functions, categories and policies
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../func_readdir/" class="md-nav__link">
<span class="md-ellipsis">
func.readdir
</span>
</a>
</li>
<li class="md-nav__item md-nav__item--active">
<input class="md-nav__toggle md-toggle" type="checkbox" id="__toc">
<a href="./" class="md-nav__link md-nav__link--active">
<span class="md-ellipsis">
rename and link
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../cache/" class="md-nav__link">
<span class="md-ellipsis">
caching
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../readahead/" class="md-nav__link">
<span class="md-ellipsis">
readahead
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../inodecalc/" class="md-nav__link">
<span class="md-ellipsis">
inodecalc
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../threads/" class="md-nav__link">
<span class="md-ellipsis">
threads
</span>
</a>
</li>
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<a href="../pin-threads/" class="md-nav__link">
<span class="md-ellipsis">
pin-threads
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../link_cow/" class="md-nav__link">
<span class="md-ellipsis">
link_cow
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../fuse_msg_size/" class="md-nav__link">
<span class="md-ellipsis">
fuse_msg_size
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../follow-symlinks/" class="md-nav__link">
<span class="md-ellipsis">
follow-symlinks
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../link-exdev/" class="md-nav__link">
<span class="md-ellipsis">
link-exdev
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../rename-exdev/" class="md-nav__link">
<span class="md-ellipsis">
rename-exdev
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../symlinkify/" class="md-nav__link">
<span class="md-ellipsis">
symlinkify
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../nullrw/" class="md-nav__link">
<span class="md-ellipsis">
nullrw
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../xattr/" class="md-nav__link">
<span class="md-ellipsis">
xattr
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../nfsopenhack/" class="md-nav__link">
<span class="md-ellipsis">
nfsopenhack
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../statfs/" class="md-nav__link">
<span class="md-ellipsis">
statfs / statvfs
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../flush-on-close/" class="md-nav__link">
<span class="md-ellipsis">
flush-on-close
</span>
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<a href="../export-support/" class="md-nav__link">
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export-support
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</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="../../error_handling/" class="md-nav__link">
<span class="md-ellipsis">
Error Handling
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</a>
</li>
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<a href="../../runtime_interfaces/" class="md-nav__link">
<span class="md-ellipsis">
Runtime Interfaces
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../../remote_filesystems/" class="md-nav__link">
<span class="md-ellipsis">
Remote Filesystems
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../../tips_notes/" class="md-nav__link">
<span class="md-ellipsis">
Tips and Notes
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Known Issues and Bugs
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Project Comparisons
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<li class="md-nav__item">
<a href="../../performance/" class="md-nav__link">
<span class="md-ellipsis">
Tweaking Performance
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</a>
</li>
<li class="md-nav__item">
<a href="../../benchmarking/" class="md-nav__link">
<span class="md-ellipsis">
Benchmarking
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</a>
</li>
<li class="md-nav__item">
<a href="../../tooling/" class="md-nav__link">
<span class="md-ellipsis">
Tooling
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</a>
</li>
<li class="md-nav__item md-nav__item--nested">
<input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_14" >
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FAQ
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<span class="md-nav__icon md-icon"></span>
</label>
<nav class="md-nav" data-md-level="1" aria-labelledby="__nav_14_label" aria-expanded="false">
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<span class="md-nav__icon md-icon"></span>
FAQ
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<ul class="md-nav__list" data-md-scrollfix>
<li class="md-nav__item">
<a href="../../faq/reliability_and_scalability/" class="md-nav__link">
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Reliability and Scalability
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<a href="../../faq/usage_and_functionality/" class="md-nav__link">
<span class="md-ellipsis">
Usage and Functionality
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<li class="md-nav__item">
<a href="../../faq/configuration_and_policies/" class="md-nav__link">
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Configuration and Policies
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<li class="md-nav__item">
<a href="../../faq/compatibility_and_integration/" class="md-nav__link">
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Compatibility and Integration
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<a href="https://github.com/trapexit/mergerfs/tree/master/mkdocs/docs/config/rename_and_link.md" title="Edit this page" class="md-content__button md-icon">
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<h1 id="rename-and-link">rename and link</h1>
<p><strong>NOTE:</strong> If you're receiving errors from software when files are
moved / renamed / linked then you should consider changing the create
policy to one which is <strong>not</strong> path preserving, enabling
<code>ignorepponrename</code>, or contacting the author of the offending software
and requesting that <code>EXDEV</code> (cross device / improper link) be properly
handled.</p>
<p><code>rename</code> and <code>link</code> are arguably the most complicated functions to
create in a union filesystem. <code>rename</code> only works within a single
filesystem or device. If a rename can't be done due to the source and
destination paths existing on different mount points it will return
<strong>-1</strong> with <strong>errno = EXDEV</strong> (cross device / improper link). So if a
<code>rename</code>'s source and target are on different filesystems within the
pool it creates an issue.</p>
<p>Originally mergerfs would return EXDEV whenever a rename was requested
which was cross directory in any way. This made the code simple and
was technically compliant with POSIX requirements. However, many
applications fail to handle EXDEV at all and treat it as a normal
error or otherwise handle it poorly. Such apps include: gvfsd-fuse
v1.20.3 and prior, Finder / CIFS/SMB client in Apple OSX 10.9+,
NZBGet, Samba's recycling bin feature.</p>
<p>As a result a compromise was made in order to get most software to
work while still obeying mergerfs' policies. Below is the basic logic.</p>
<ul>
<li>If using a <strong>create</strong> policy which tries to preserve directory paths (epff,eplfs,eplus,epmfs)</li>
<li>Using the <strong>rename</strong> policy get the list of files to rename</li>
<li>For each file attempt rename:<ul>
<li>If failure with ENOENT (no such file or directory) run <strong>create</strong> policy</li>
<li>If create policy returns the same branch as currently evaluating then clone the path</li>
<li>Re-attempt rename</li>
</ul>
</li>
<li>If <strong>any</strong> of the renames succeed the higher level rename is considered a success</li>
<li>If <strong>no</strong> renames succeed the first error encountered will be returned</li>
<li>On success:<ul>
<li>Remove the target from all branches with no source file</li>
<li>Remove the source from all branches which failed to rename</li>
</ul>
</li>
<li>If using a <strong>create</strong> policy which does <strong>not</strong> try to preserve directory paths</li>
<li>Using the <strong>rename</strong> policy get the list of files to rename</li>
<li>Using the <strong>getattr</strong> policy get the target path</li>
<li>For each file attempt rename:<ul>
<li>If the source branch != target branch:</li>
<li>Clone target path from target branch to source branch</li>
<li>Rename</li>
</ul>
</li>
<li>If <strong>any</strong> of the renames succeed the higher level rename is considered a success</li>
<li>If <strong>no</strong> renames succeed the first error encountered will be returned</li>
<li>On success:<ul>
<li>Remove the target from all branches with no source file</li>
<li>Remove the source from all branches which failed to rename</li>
</ul>
</li>
</ul>
<p>The removals are subject to normal entitlement checks. If the unlink
fails it will fail silently.</p>
<p>The above behavior will help minimize the likelihood of EXDEV being
returned but it will still be possible.</p>
<p><strong>link</strong> uses the same strategy but without the removals.</p>
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