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<li class="md-nav__item">
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<a href="../intro_to_filesystems/" class="md-nav__link">
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<span class="md-ellipsis">
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Intro to 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 md-nav__item--nested">
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<input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_6" >
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<label class="md-nav__link" for="__nav_6" id="__nav_6_label" tabindex="0">
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<span class="md-ellipsis">
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Config
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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_6_label" aria-expanded="false">
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<label class="md-nav__title" for="__nav_6">
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<span class="md-nav__icon md-icon"></span>
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Config
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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="../config/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 class="md-nav__item">
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<a href="../config/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 class="md-nav__item">
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<a href="../config/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="../config/branches-mount-timeout/" class="md-nav__link">
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<span class="md-ellipsis">
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branches-mount-timeout
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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="../config/functions_categories_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 class="md-nav__item">
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<a href="../config/minfreespace/" class="md-nav__link">
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<span class="md-ellipsis">
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minfreespace
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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="../config/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="../config/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="../config/moveonenospc/" class="md-nav__link">
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<span class="md-ellipsis">
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moveonenospc
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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="../config/cache/" class="md-nav__link">
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<span class="md-ellipsis">
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caching
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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="../config/passthrough/" class="md-nav__link">
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<span class="md-ellipsis">
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passthrough
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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="../config/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">
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<a href="../config/inodecalc/" class="md-nav__link">
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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="../config/threads/" class="md-nav__link">
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<span class="md-ellipsis">
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threads
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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="../config/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>
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<li class="md-nav__item">
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<a href="../config/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="../config/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="../config/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="../config/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="../config/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="../config/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="../config/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="../config/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="../config/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="../config/statfs/" class="md-nav__link">
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<span class="md-ellipsis">
|
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statfs / statvfs
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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="../config/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="../config/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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<li class="md-nav__item">
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<a href="../config/kernel-permissions-check/" class="md-nav__link">
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<span class="md-ellipsis">
|
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kernel-permissions-check
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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_and_logging/" class="md-nav__link">
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<span class="md-ellipsis">
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Error Handling and Logging
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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="../resource_usage/" class="md-nav__link">
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<span class="md-ellipsis">
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Resource Usage and Management
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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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<label class="md-nav__link md-nav__link--active" for="__toc">
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<span class="md-ellipsis">
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Runtime Interface
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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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<a href="./" class="md-nav__link md-nav__link--active">
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<span class="md-ellipsis">
|
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Runtime Interface
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</span>
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</a>
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|
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<nav class="md-nav md-nav--secondary" aria-label="Table of contents">
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<label class="md-nav__title" for="__toc">
|
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<span class="md-nav__icon md-icon"></span>
|
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Table of contents
|
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</label>
|
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<ul class="md-nav__list" data-md-component="toc" data-md-scrollfix>
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<li class="md-nav__item">
|
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<a href="#mergerfs-pseudo-file" class="md-nav__link">
|
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<span class="md-ellipsis">
|
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.mergerfs pseudo file
|
|
</span>
|
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</a>
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|
|
<nav class="md-nav" aria-label=".mergerfs pseudo file">
|
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<ul class="md-nav__list">
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<li class="md-nav__item">
|
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<a href="#command-line-tooling" class="md-nav__link">
|
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<span class="md-ellipsis">
|
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Command Line 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">
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<a href="#config" class="md-nav__link">
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<span class="md-ellipsis">
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Config
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</span>
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</a>
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<nav class="md-nav" aria-label="Config">
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<ul class="md-nav__list">
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<li class="md-nav__item">
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<a href="#keys" class="md-nav__link">
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<span class="md-ellipsis">
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Keys
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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="#values" class="md-nav__link">
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<span class="md-ellipsis">
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Values
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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="#getting" class="md-nav__link">
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<span class="md-ellipsis">
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Getting
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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="#setting" class="md-nav__link">
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<span class="md-ellipsis">
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Setting
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<h1 id="runtime-interface">Runtime Interface</h1>
|
|
<p><code>mergerfs</code> has runtime interfaces allowing users to query certain
|
|
filesystem information, get and set config, and trigger certain
|
|
activities while it is running.</p>
|
|
<p>The interface is provided via the POSIX extended attributes filesystem
|
|
API which is a namespaced <code>key=value</code> pair store associated with a
|
|
file. Since <code>mergerfs</code> primarily uses <code>key=value</code> pairs for config it
|
|
fits well and is a known and reasonably well supported API.</p>
|
|
<p>There are two targets for <code>xattr</code> calls. One is a pseudo file used for
|
|
getting and setting config and issuing certain commands. The other are
|
|
files found on the filesystem for querying certain <code>mergerfs</code> specific
|
|
information about them.</p>
|
|
<h2 id="mergerfs-pseudo-file">.mergerfs pseudo file</h2>
|
|
<div class="language-text highlight"><pre><span></span><code><span id="__span-0-1"><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a><mountpoint>/.mergerfs
|
|
</span></code></pre></div>
|
|
<p><code>mergerfs</code> provides this pseudo file for the runtime modification of
|
|
certain options and issuing commands. The file will not show up in
|
|
<code>readdir</code> but can be <code>stat</code>'ed and viewed/manipulated via
|
|
<a href="http://linux.die.net/man/2/listxattr">listxattr</a>,
|
|
<a href="https://linux.die.net/man/2/getxattr">getxattr</a>, and
|
|
<a href="https://linux.die.net/man/2/setxattr">setxattr</a> calls.</p>
|
|
<p>Any changes made at runtime are <strong>NOT</strong> persisted. If you wish for
|
|
values to persist they must be included as options wherever you
|
|
configure the mounting of mergerfs (/etc/fstab, systemd, etc.).</p>
|
|
<h3 id="command-line-tooling">Command Line Tooling</h3>
|
|
<p>Extended attributes is prevelant enough that there are common tools
|
|
available for interacting with them.</p>
|
|
<p>In Debian / Ubuntu distributions you can get the tools
|
|
<a href="https://linux.die.net/man/1/getfattr">getfattr</a> and
|
|
<a href="https://linux.die.net/man/1/setfattr">setfattr</a> from
|
|
<a href="https://linux.die.net/man/5/attr">attr</a> package.</p>
|
|
<div class="language-text highlight"><pre><span></span><code><span id="__span-1-1"><a id="__codelineno-1-1" name="__codelineno-1-1" href="#__codelineno-1-1"></a>$ sudo apt-get install attr
|
|
</span></code></pre></div>
|
|
<h3 id="config">Config</h3>
|
|
<h4 id="keys">Keys</h4>
|
|
<p>Use <code>getfattr -d /mountpoint/.mergerfs</code> to see all supported
|
|
configuration keys. It is effectively the same as the
|
|
<a href="../config/options/">options</a> prefixed with <code>user.mergerfs.</code>. Some are
|
|
informational or only can be set at startup and therefore read-only.</p>
|
|
<p>Example: option <code>cache.files</code> would be <code>user.mergerfs.cache.files</code>.</p>
|
|
<h4 id="values">Values</h4>
|
|
<p>Same as the <a href="../config/options/">command line options</a>.</p>
|
|
<h4 id="getting">Getting</h4>
|
|
<p><code>getfattr -n user.mergerfs.branches /mountpoint/.mergerfs</code></p>
|
|
<p><code>ENOATTR</code> will be returned if the key doesn't exist as normal with
|
|
<a href="https://linux.die.net/man/2/getxattr">getxattr</a>.</p>
|
|
<h4 id="setting">Setting</h4>
|
|
<p><code>setfattr -n user.mergerfs.branches -v VALUE /mountpoint/.mergerfs</code></p>
|
|
<p><a href="https://linux.die.net/man/2/setxattr">setxattr</a> will return <code>EROFS</code>
|
|
(Read-only filesystem) on read-only keys. <code>ENOATTR</code> will be returned
|
|
if the key does not exist. If the value attempting to be set is not
|
|
valid <code>EINVAL</code> will be returned.</p>
|
|
<h4 id="usermergerfsbranches">user.mergerfs.branches</h4>
|
|
<p><code>branches</code> has the ability to understand some simple instructions to
|
|
make manipulation of the list easier. The <code>[list]</code> is simply what is
|
|
described in the <a href="../config/branches/">branches</a> docs.</p>
|
|
<table>
|
|
<thead>
|
|
<tr>
|
|
<th>Value</th>
|
|
<th>Description</th>
|
|
</tr>
|
|
</thead>
|
|
<tbody>
|
|
<tr>
|
|
<td>[list]</td>
|
|
<td>set</td>
|
|
</tr>
|
|
<tr>
|
|
<td>+<[list]</td>
|
|
<td>prepend to existing list</td>
|
|
</tr>
|
|
<tr>
|
|
<td>+>[list]</td>
|
|
<td>append to existing list</td>
|
|
</tr>
|
|
<tr>
|
|
<td>-[list]</td>
|
|
<td>remove all values provided</td>
|
|
</tr>
|
|
<tr>
|
|
<td>-<</td>
|
|
<td>remove first in list</td>
|
|
</tr>
|
|
<tr>
|
|
<td>-></td>
|
|
<td>remove last in list</td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
<p><strong>NOTE:</strong> if the value of <code>branches</code> is set to something invalid /
|
|
non-existant <code>mergerfs</code> will return a bogus entry when the mount point
|
|
directory is <code>stat</code>'ed and create a fake file entry when listing the
|
|
directory telling the user "error: no valid mergerfs branch found,
|
|
check config". This is done to ensure the user understands the
|
|
situation and continue to be able to access the xattr interface.</p>
|
|
<h4 id="example">Example</h4>
|
|
<div class="language-text highlight"><pre><span></span><code><span id="__span-2-1"><a id="__codelineno-2-1" name="__codelineno-2-1" href="#__codelineno-2-1"></a>[trapexit:/mnt/mergerfs] $ getfattr -d .mergerfs
|
|
</span><span id="__span-2-2"><a id="__codelineno-2-2" name="__codelineno-2-2" href="#__codelineno-2-2"></a>user.mergerfs.branches="/mnt/a=RW:/mnt/b=RW"
|
|
</span><span id="__span-2-3"><a id="__codelineno-2-3" name="__codelineno-2-3" href="#__codelineno-2-3"></a>user.mergerfs.minfreespace="4294967295"
|
|
</span><span id="__span-2-4"><a id="__codelineno-2-4" name="__codelineno-2-4" href="#__codelineno-2-4"></a>user.mergerfs.moveonenospc="false"
|
|
</span><span id="__span-2-5"><a id="__codelineno-2-5" name="__codelineno-2-5" href="#__codelineno-2-5"></a>...
|
|
</span><span id="__span-2-6"><a id="__codelineno-2-6" name="__codelineno-2-6" href="#__codelineno-2-6"></a>
|
|
</span><span id="__span-2-7"><a id="__codelineno-2-7" name="__codelineno-2-7" href="#__codelineno-2-7"></a>[trapexit:/mnt/mergerfs] $ getfattr -n user.mergerfs.category.create .mergerfs
|
|
</span><span id="__span-2-8"><a id="__codelineno-2-8" name="__codelineno-2-8" href="#__codelineno-2-8"></a>user.mergerfs.category.search="mfs"
|
|
</span><span id="__span-2-9"><a id="__codelineno-2-9" name="__codelineno-2-9" href="#__codelineno-2-9"></a>
|
|
</span><span id="__span-2-10"><a id="__codelineno-2-10" name="__codelineno-2-10" href="#__codelineno-2-10"></a>[trapexit:/mnt/mergerfs] $ setfattr -n user.mergerfs.category.create -v pfrd .mergerfs
|
|
</span><span id="__span-2-11"><a id="__codelineno-2-11" name="__codelineno-2-11" href="#__codelineno-2-11"></a>[trapexit:/mnt/mergerfs] $ getfattr -n user.mergerfs.category.create .mergerfs
|
|
</span><span id="__span-2-12"><a id="__codelineno-2-12" name="__codelineno-2-12" href="#__codelineno-2-12"></a>user.mergerfs.category.search="prfd"
|
|
</span><span id="__span-2-13"><a id="__codelineno-2-13" name="__codelineno-2-13" href="#__codelineno-2-13"></a>
|
|
</span><span id="__span-2-14"><a id="__codelineno-2-14" name="__codelineno-2-14" href="#__codelineno-2-14"></a>[trapexit:/mnt/mergerfs] $ setfattr -n user.mergerfs.branches -v "'+</mnt/c=RO .mergerfs
|
|
</span><span id="__span-2-15"><a id="__codelineno-2-15" name="__codelineno-2-15" href="#__codelineno-2-15"></a>[trapexit:/mnt/mergerfs] $ getfattr -n user.mergerfs.branches .mergerfs
|
|
</span><span id="__span-2-16"><a id="__codelineno-2-16" name="__codelineno-2-16" href="#__codelineno-2-16"></a>user.mergerfs.branches="/mnt/c=RO:/mnt/a=RW:/mnt/b=RW"
|
|
</span></code></pre></div>
|
|
<h3 id="commands">Commands</h3>
|
|
<p>There are a number of commands / behaviors which can be triggerd by
|
|
writing (<a href="https://linux.die.net/man/1/setfattr">setfattr</a>,
|
|
<a href="https://linux.die.net/man/2/setxattr">setxattr</a>) particular xattr
|
|
keys of <code>/mountpoint/.mergerfs</code>. These keys do not show up in key
|
|
listings.</p>
|
|
<p>Commands can take an argument however currently no command uses or
|
|
allows a value.</p>
|
|
<table>
|
|
<thead>
|
|
<tr>
|
|
<th>Key</th>
|
|
<th>Value</th>
|
|
<th>Description</th>
|
|
</tr>
|
|
</thead>
|
|
<tbody>
|
|
<tr>
|
|
<td>user.mergerfs.cmd.gc</td>
|
|
<td>(empty)</td>
|
|
<td>Trigger a thorough garbage collection of certain pools of resources. The xattr value is not used.</td>
|
|
</tr>
|
|
<tr>
|
|
<td>user.mergerfs.cmd.gc1</td>
|
|
<td>(empty)</td>
|
|
<td>Trigger a simple garbage collection of certain pools of resources. This is also done on a timer.</td>
|
|
</tr>
|
|
<tr>
|
|
<td>user.mergerfs.cmd.invalidate-all-nodes</td>
|
|
<td>(empty)</td>
|
|
<td>Attempts to invalidate FUSE file nodes. Primarily used for debugging.</td>
|
|
</tr>
|
|
<tr>
|
|
<td>user.mergerfs.cmd.invalidate-gid-cache</td>
|
|
<td>(empty)</td>
|
|
<td>Invalidates all entries in gid cache. Primarily used for debugging but can also be useful in cases where gid supplemental groups change.</td>
|
|
</tr>
|
|
<tr>
|
|
<td>user.mergerfs.cmd.clear-gid-cache</td>
|
|
<td>(empty)</td>
|
|
<td>Clears all entries in the gid cache. Primarily used for debugging but can also be useful in cases where gid supplemental groups change.</td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
<div class="language-text highlight"><pre><span></span><code><span id="__span-3-1"><a id="__codelineno-3-1" name="__codelineno-3-1" href="#__codelineno-3-1"></a>[trapexit:/mnt/mergerfs] $ setfattr -n user.mergerfs.cmd.gc /mnt/mergerfs/.mergerfs
|
|
</span><span id="__span-3-2"><a id="__codelineno-3-2" name="__codelineno-3-2" href="#__codelineno-3-2"></a>[trapexit:/mnt/mergerfs] $ journalctl -t mergerfs | tail -n1
|
|
</span><span id="__span-3-3"><a id="__codelineno-3-3" name="__codelineno-3-3" href="#__codelineno-3-3"></a>Jul 20 15:36:18 hostname mergerfs[1931348]: running basic garbage collection
|
|
</span></code></pre></div>
|
|
<h3 id="file-directory-xattrs">file / directory xattrs</h3>
|
|
<p>There is certain information <code>mergerfs</code> knows or calculates about a
|
|
file that can be useful in building tooling or debugging.</p>
|
|
<p>The keys below can be queried (<code>getfattr -n key</code>,
|
|
<a href="http://linux.die.net/man/2/getxattr">getxattr</a>) to get the described
|
|
information. These keys will not show up in any listing (<code>getfattr
|
|
-d</code>, <a href="https://linux.die.net/man/2/listxattr">listxattr</a>). Attempting
|
|
to set them will result in an error.</p>
|
|
<table>
|
|
<thead>
|
|
<tr>
|
|
<th>Key</th>
|
|
<th>Return Value</th>
|
|
</tr>
|
|
</thead>
|
|
<tbody>
|
|
<tr>
|
|
<td>user.mergerfs.basepath</td>
|
|
<td>The base mount point for the file given the current <code>getattr</code> policy.</td>
|
|
</tr>
|
|
<tr>
|
|
<td>user.mergerfs.relpath</td>
|
|
<td>The relative path of the file from the perspective of the mount point.</td>
|
|
</tr>
|
|
<tr>
|
|
<td>user.mergerfs.fullpath</td>
|
|
<td>The full path of the original file given the <code>getattr</code> policy.</td>
|
|
</tr>
|
|
<tr>
|
|
<td>user.mergerfs.allpaths</td>
|
|
<td>A NULL ('\0') separated list of full paths to all files found.</td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
<div class="language-text highlight"><pre><span></span><code><span id="__span-4-1"><a id="__codelineno-4-1" name="__codelineno-4-1" href="#__codelineno-4-1"></a>[trapexit:/mnt/mergerfs] $ getfattr -n user.mergerfs.fullpath test
|
|
</span><span id="__span-4-2"><a id="__codelineno-4-2" name="__codelineno-4-2" href="#__codelineno-4-2"></a>user.mergerfs.fullpath="/mnt/a/test"
|
|
</span><span id="__span-4-3"><a id="__codelineno-4-3" name="__codelineno-4-3" href="#__codelineno-4-3"></a>[trapexit:/mnt/mergerfs] $ getfattr -n user.mergerfs.allpaths .
|
|
</span><span id="__span-4-4"><a id="__codelineno-4-4" name="__codelineno-4-4" href="#__codelineno-4-4"></a>user.mergerfs.allpaths="/mnt/a\000/mnt/b\000/mnt/c"
|
|
</span></code></pre></div>
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|
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