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</span>
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../options/" class="md-nav__link">
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<span class="md-ellipsis">
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Options
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</span>
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../deprecated_options/" class="md-nav__link">
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<span class="md-ellipsis">
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Deprecated Options
|
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</span>
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../branches/" class="md-nav__link">
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<span class="md-ellipsis">
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branches
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../functions_categories_and_policies/" class="md-nav__link">
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<span class="md-ellipsis">
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functions, categories and policies
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</span>
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../func_readdir/" class="md-nav__link">
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<span class="md-ellipsis">
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func.readdir
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</span>
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../rename_and_link/" class="md-nav__link">
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<span class="md-ellipsis">
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rename and link
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</span>
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../cache/" class="md-nav__link">
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<span class="md-ellipsis">
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caching
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../readahead/" class="md-nav__link">
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<span class="md-ellipsis">
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readahead
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</span>
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</a>
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</li>
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<li class="md-nav__item md-nav__item--active">
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<input class="md-nav__toggle md-toggle" type="checkbox" id="__toc">
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<a href="./" class="md-nav__link md-nav__link--active">
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<span class="md-ellipsis">
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inodecalc
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</span>
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../threads/" class="md-nav__link">
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<span class="md-ellipsis">
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threads
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../pin-threads/" class="md-nav__link">
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<span class="md-ellipsis">
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pin-threads
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</span>
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</a>
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<li class="md-nav__item">
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<a href="../link_cow/" class="md-nav__link">
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<span class="md-ellipsis">
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link_cow
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</span>
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../fuse_msg_size/" class="md-nav__link">
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<span class="md-ellipsis">
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fuse_msg_size
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</span>
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../follow-symlinks/" class="md-nav__link">
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<span class="md-ellipsis">
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follow-symlinks
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</span>
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../link-exdev/" class="md-nav__link">
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<span class="md-ellipsis">
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link-exdev
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</span>
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../rename-exdev/" class="md-nav__link">
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<span class="md-ellipsis">
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rename-exdev
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</span>
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</a>
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</li>
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<li class="md-nav__item">
|
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<a href="../symlinkify/" class="md-nav__link">
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<span class="md-ellipsis">
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symlinkify
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</span>
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</a>
|
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</li>
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<li class="md-nav__item">
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<a href="../nullrw/" class="md-nav__link">
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<span class="md-ellipsis">
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nullrw
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</span>
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</a>
|
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</li>
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<li class="md-nav__item">
|
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<a href="../xattr/" class="md-nav__link">
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<span class="md-ellipsis">
|
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xattr
|
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</span>
|
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</a>
|
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</li>
|
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<li class="md-nav__item">
|
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<a href="../nfsopenhack/" class="md-nav__link">
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<span class="md-ellipsis">
|
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nfsopenhack
|
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</span>
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</a>
|
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</li>
|
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<li class="md-nav__item">
|
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<a href="../statfs/" class="md-nav__link">
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<span class="md-ellipsis">
|
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statfs / statvfs
|
|
</span>
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</a>
|
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</li>
|
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<li class="md-nav__item">
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<a href="../flush-on-close/" class="md-nav__link">
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<span class="md-ellipsis">
|
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flush-on-close
|
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</span>
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</a>
|
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</li>
|
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<li class="md-nav__item">
|
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<a href="../export-support/" class="md-nav__link">
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<span class="md-ellipsis">
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export-support
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</span>
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</a>
|
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</li>
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</ul>
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</nav>
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</li>
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<li class="md-nav__item">
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<a href="../../error_handling/" class="md-nav__link">
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<span class="md-ellipsis">
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Error Handling
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</span>
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</a>
|
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</li>
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<li class="md-nav__item">
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<a href="../../runtime_interfaces/" class="md-nav__link">
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<span class="md-ellipsis">
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Runtime Interfaces
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</span>
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</a>
|
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</li>
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<li class="md-nav__item">
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<a href="../../remote_filesystems/" class="md-nav__link">
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<span class="md-ellipsis">
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Remote Filesystems
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</span>
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</a>
|
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</li>
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<li class="md-nav__item">
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<a href="../../tips_notes/" class="md-nav__link">
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<span class="md-ellipsis">
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Tips and Notes
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</span>
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</a>
|
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</li>
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<li class="md-nav__item">
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<a href="../../known_issues_bugs/" class="md-nav__link">
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<span class="md-ellipsis">
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Known Issues and Bugs
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</span>
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../../project_comparisons/" class="md-nav__link">
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<span class="md-ellipsis">
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Project Comparisons
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</span>
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|
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</a>
|
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</li>
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<li class="md-nav__item">
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<a href="../../performance/" class="md-nav__link">
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|
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|
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<span class="md-ellipsis">
|
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Tweaking Performance
|
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</span>
|
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|
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</a>
|
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</li>
|
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<li class="md-nav__item">
|
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<a href="../../benchmarking/" class="md-nav__link">
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<span class="md-ellipsis">
|
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Benchmarking
|
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</span>
|
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|
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</a>
|
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</li>
|
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<li class="md-nav__item">
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<a href="../../tooling/" class="md-nav__link">
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|
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|
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<span class="md-ellipsis">
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Tooling
|
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</span>
|
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</a>
|
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</li>
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<li class="md-nav__item md-nav__item--nested">
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<input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_14" >
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<label class="md-nav__link" for="__nav_14" id="__nav_14_label" tabindex="0">
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<span class="md-ellipsis">
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FAQ
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</span>
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<span class="md-nav__icon md-icon"></span>
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</label>
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<nav class="md-nav" data-md-level="1" aria-labelledby="__nav_14_label" aria-expanded="false">
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<label class="md-nav__title" for="__nav_14">
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<span class="md-nav__icon md-icon"></span>
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FAQ
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</label>
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<ul class="md-nav__list" data-md-scrollfix>
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<li class="md-nav__item">
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<a href="../../faq/reliability_and_scalability/" class="md-nav__link">
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|
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<span class="md-ellipsis">
|
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Reliability and Scalability
|
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</span>
|
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|
|
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</a>
|
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</li>
|
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<li class="md-nav__item">
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<a href="../../faq/usage_and_functionality/" class="md-nav__link">
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<span class="md-ellipsis">
|
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Usage and Functionality
|
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</span>
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</a>
|
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</li>
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<li class="md-nav__item">
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<a href="../../faq/configuration_and_policies/" class="md-nav__link">
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<span class="md-ellipsis">
|
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Configuration and Policies
|
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</span>
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|
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</a>
|
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</li>
|
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<li class="md-nav__item">
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<a href="../../faq/compatibility_and_integration/" class="md-nav__link">
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<span class="md-ellipsis">
|
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Compatibility and Integration
|
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</span>
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|
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</a>
|
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</li>
|
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<li class="md-nav__item">
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<a href="../../faq/recommendations_and_warnings/" class="md-nav__link">
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<span class="md-ellipsis">
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Recommendations and Warnings
|
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</span>
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|
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</a>
|
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</li>
|
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<li class="md-nav__item">
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<a href="../../faq/technical_behavior_and_limitations/" class="md-nav__link">
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<span class="md-ellipsis">
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Technical Behavior and Limitations
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</span>
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</a>
|
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</li>
|
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<li class="md-nav__item">
|
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<a href="../../faq/limit_drive_spinup/" class="md-nav__link">
|
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|
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|
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<span class="md-ellipsis">
|
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Limiting drive spinup
|
|
</span>
|
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|
|
|
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</a>
|
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</li>
|
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</ul>
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</nav>
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</li>
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<li class="md-nav__item">
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<a href="../../related_projects/" class="md-nav__link">
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<h1 id="inodecalc">inodecalc</h1>
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<p>Inodes (<code>st_ino</code>) are unique identifiers within a filesystem. Each
|
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mounted filesystem has device ID (st_dev) as well and together they
|
|
can uniquely identify a file on the whole of the system. Entries on
|
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the same device with the same inode are in fact references to the same
|
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underlying file. It is a many to one relationship between names and an
|
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inode. Directories, however, do not have multiple links on most
|
|
systems due to the complexity they add.</p>
|
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<p>FUSE allows the server (mergerfs) to set inode values but not device
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IDs. Creating an inode value is somewhat complex in mergerfs' case as
|
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files aren't really in its control. If a policy changes what directory
|
|
or file is to be selected or something changes out of band it becomes
|
|
unclear what value should be used. Most software does not to care what
|
|
the values are but those that do often break if a value changes
|
|
unexpectedly. The tool find will abort a directory walk if it sees a
|
|
directory inode change. NFS can return stale handle errors if the
|
|
inode changes out of band. File dedup tools will usually leverage
|
|
device ids and inodes as a shortcut in searching for duplicate files
|
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and would resort to full file comparisons should it find different
|
|
inode values.</p>
|
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<p>mergerfs offers multiple ways to calculate the inode in hopes of
|
|
covering different usecases.</p>
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<ul>
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<li><code>passthrough</code>: Passes through the underlying inode value. Mostly
|
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intended for testing as using this does not address any of the
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problems mentioned above and could confuse file deduplication
|
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software as inodes from different filesystems can be the same.</li>
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<li><code>path-hash</code>: Hashes the relative path of the entry in question. The
|
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underlying file's values are completely ignored. This means the
|
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inode value will always be the same for that file path. This is
|
|
useful when using NFS and you make changes out of band such as copy
|
|
data between branches. This also means that entries that do point to
|
|
the same file will not be recognizable via inodes. That does not
|
|
mean hard links don't work. They will.</li>
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<li><code>path-hash32</code>: 32bit version of path-hash.</li>
|
|
<li><code>devino-hash</code>: Hashes the device id and inode of the underlying
|
|
entry. This won't prevent issues with NFS should the policy pick a
|
|
different file or files move out of band but will present the same
|
|
inode for underlying files that do too.</li>
|
|
<li><code>devino-hash32</code>: 32bit version of devino-hash.</li>
|
|
<li><code>hybrid-hash</code>: Performs path-hash on directories and devino-hash on
|
|
other file types. Since directories can't have hard links the static
|
|
value won't make a difference and the files will get values useful
|
|
for finding duplicates. Probably the best to use if not using
|
|
NFS. As such it is the default.</li>
|
|
<li><code>hybrid-hash32</code>: 32bit version of hybrid-hash.</li>
|
|
</ul>
|
|
<p>32bit versions are provided as there is some software which does not
|
|
handle 64bit inodes well.</p>
|
|
<p>While there is a risk of hash collision in tests of a couple of
|
|
million entries there were zero collisions. Unlike a typical
|
|
filesystem FUSE filesystems can reuse inodes and not refer to the same
|
|
entry. The internal identifier used to reference a file in FUSE is
|
|
different from the inode value presented. The former is the nodeid and
|
|
is actually a tuple of 2 64bit values: nodeid and generation. This
|
|
tuple is not client facing. The inode that is presented to the client
|
|
is passed through the kernel uninterpreted.</p>
|
|
<p>From FUSE docs for <code>use_ino</code>:</p>
|
|
<blockquote>
|
|
<p>Honor the st_ino field in the functions getattr() and
|
|
fill_dir(). This value is used to fill in the st_ino field
|
|
in the stat(2), lstat(2), fstat(2) functions and the d_ino
|
|
field in the readdir(2) function. The filesystem does not
|
|
have to guarantee uniqueness, however some applications
|
|
rely on this value being unique for the whole filesystem.
|
|
Note that this does <em>not</em> affect the inode that libfuse
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|
and the kernel use internally (also called the "nodeid").</p>
|
|
</blockquote>
|
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<p><strong>NOTE:</strong> As of version 2.35.0 the use_ino option has been
|
|
removed. mergerfs should always be managing inode values.</p>
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