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<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"> <span class="md-nav__icon md-icon"></span> 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 </span>
</a> </li>
<li class="md-nav__item"> <a href="../setup/upgrade/" class="md-nav__link"> <span class="md-ellipsis"> Upgrade </span>
</a> </li>
<li class="md-nav__item"> <a href="../setup/build/" class="md-nav__link"> <span class="md-ellipsis"> Build </span>
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</ul> </nav> </li>
<li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_4" > <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="false"> <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="../config/terminology/" class="md-nav__link"> <span class="md-ellipsis"> Terminology </span>
</a> </li>
<li class="md-nav__item"> <a href="../config/options/" class="md-nav__link"> <span class="md-ellipsis"> Options </span>
</a> </li>
<li class="md-nav__item"> <a href="../config/deprecated_options/" class="md-nav__link"> <span class="md-ellipsis"> Deprecated Options </span>
</a> </li>
<li class="md-nav__item"> <a href="../config/branches/" class="md-nav__link"> <span class="md-ellipsis"> branches </span>
</a> </li>
<li class="md-nav__item"> <a href="../config/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="../config/func_readdir/" class="md-nav__link"> <span class="md-ellipsis"> func.readdir </span>
</a> </li>
<li class="md-nav__item"> <a href="../config/rename_and_link/" class="md-nav__link"> <span class="md-ellipsis"> rename and link </span>
</a> </li>
<li class="md-nav__item"> <a href="../config/cache/" class="md-nav__link"> <span class="md-ellipsis"> caching </span>
</a> </li>
<li class="md-nav__item"> <a href="../config/readahead/" class="md-nav__link"> <span class="md-ellipsis"> readahead </span>
</a> </li>
<li class="md-nav__item"> <a href="../config/inodecalc/" class="md-nav__link"> <span class="md-ellipsis"> inodecalc </span>
</a> </li>
<li class="md-nav__item"> <a href="../config/threads/" class="md-nav__link"> <span class="md-ellipsis"> threads </span>
</a> </li>
<li class="md-nav__item"> <a href="../config/pin-threads/" class="md-nav__link"> <span class="md-ellipsis"> pin-threads </span>
</a> </li>
<li class="md-nav__item"> <a href="../config/link_cow/" class="md-nav__link"> <span class="md-ellipsis"> link_cow </span>
</a> </li>
<li class="md-nav__item"> <a href="../config/fuse_msg_size/" class="md-nav__link"> <span class="md-ellipsis"> fuse_msg_size </span>
</a> </li>
<li class="md-nav__item"> <a href="../config/follow-symlinks/" class="md-nav__link"> <span class="md-ellipsis"> follow-symlinks </span>
</a> </li>
<li class="md-nav__item"> <a href="../config/link-exdev/" class="md-nav__link"> <span class="md-ellipsis"> link-exdev </span>
</a> </li>
<li class="md-nav__item"> <a href="../config/rename-exdev/" class="md-nav__link"> <span class="md-ellipsis"> rename-exdev </span>
</a> </li>
<li class="md-nav__item"> <a href="../config/symlinkify/" class="md-nav__link"> <span class="md-ellipsis"> symlinkify </span>
</a> </li>
<li class="md-nav__item"> <a href="../config/nullrw/" class="md-nav__link"> <span class="md-ellipsis"> nullrw </span>
</a> </li>
<li class="md-nav__item"> <a href="../config/xattr/" class="md-nav__link"> <span class="md-ellipsis"> xattr </span>
</a> </li>
<li class="md-nav__item"> <a href="../config/nfsopenhack/" class="md-nav__link"> <span class="md-ellipsis"> nfsopenhack </span>
</a> </li>
<li class="md-nav__item"> <a href="../config/statfs/" class="md-nav__link"> <span class="md-ellipsis"> statfs / statvfs </span>
</a> </li>
<li class="md-nav__item"> <a href="../config/flush-on-close/" class="md-nav__link"> <span class="md-ellipsis"> flush-on-close </span>
</a> </li>
<li class="md-nav__item"> <a href="../config/export-support/" class="md-nav__link"> <span class="md-ellipsis"> export-support </span>
</a> </li>
</ul> </nav> </li>
<li class="md-nav__item md-nav__item--active"> <input class="md-nav__toggle md-toggle" type="checkbox" id="__toc"> <label class="md-nav__link md-nav__link--active" for="__toc"> <span class="md-ellipsis"> Error Handling </span>
<span class="md-nav__icon md-icon"></span> </label> <a href="./" class="md-nav__link md-nav__link--active"> <span class="md-ellipsis"> Error Handling </span>
</a>
<nav class="md-nav md-nav--secondary" aria-label="Table of contents"> <label class="md-nav__title" for="__toc"> <span class="md-nav__icon md-icon"></span> Table of contents </label> <ul class="md-nav__list" data-md-component="toc" data-md-scrollfix> <li class="md-nav__item"> <a href="#chmod-chown-removexattr-setxattr-truncate-utimens" class="md-nav__link"> <span class="md-ellipsis"> chmod, chown, removexattr, setxattr, truncate, utimens </span> </a> </li> <li class="md-nav__item"> <a href="#unlink-rmdir" class="md-nav__link"> <span class="md-ellipsis"> unlink, rmdir </span> </a> </li> <li class="md-nav__item"> <a href="#others" class="md-nav__link"> <span class="md-ellipsis"> others </span> </a> </li> </ul> </nav> </li>
<li class="md-nav__item"> <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 </span>
</a> </li>
<li class="md-nav__item"> <a href="../known_issues_bugs/" class="md-nav__link"> <span class="md-ellipsis"> Known Issues and Bugs </span>
</a> </li>
<li class="md-nav__item"> <a href="../project_comparisons/" class="md-nav__link"> <span class="md-ellipsis"> Project Comparisons </span>
</a> </li>
<li class="md-nav__item"> <a href="../performance/" class="md-nav__link"> <span class="md-ellipsis"> Tweaking Performance </span>
</a> </li>
<li class="md-nav__item"> <a href="../benchmarking/" class="md-nav__link"> <span class="md-ellipsis"> Benchmarking </span>
</a> </li>
<li class="md-nav__item"> <a href="../tooling/" class="md-nav__link"> <span class="md-ellipsis"> Tooling </span>
</a> </li>
<li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_14" > <label class="md-nav__link" for="__nav_14" id="__nav_14_label" tabindex="0"> <span class="md-ellipsis"> FAQ </span>
<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"> <label class="md-nav__title" for="__nav_14"> <span class="md-nav__icon md-icon"></span> FAQ </label> <ul class="md-nav__list" data-md-scrollfix> <li class="md-nav__item"> <a href="../faq/reliability_and_scalability/" class="md-nav__link"> <span class="md-ellipsis"> Reliability and Scalability </span>
</a> </li>
<li class="md-nav__item"> <a href="../faq/usage_and_functionality/" class="md-nav__link"> <span class="md-ellipsis"> Usage and Functionality </span>
</a> </li>
<li class="md-nav__item"> <a href="../faq/configuration_and_policies/" class="md-nav__link"> <span class="md-ellipsis"> Configuration and Policies </span>
</a> </li>
<li class="md-nav__item"> <a href="../faq/compatibility_and_integration/" class="md-nav__link"> <span class="md-ellipsis"> Compatibility and Integration </span>
</a> </li>
<li class="md-nav__item"> <a href="../faq/recommendations_and_warnings/" class="md-nav__link"> <span class="md-ellipsis"> Recommendations and Warnings </span>
</a> </li>
<li class="md-nav__item"> <a href="../faq/technical_behavior_and_limitations/" class="md-nav__link"> <span class="md-ellipsis"> Technical Behavior and Limitations </span>
</a> </li>
<li class="md-nav__item"> <a href="../faq/limit_drive_spinup/" class="md-nav__link"> <span class="md-ellipsis"> Limiting drive spinup </span>
</a> </li>
</ul> </nav> </li>
<li class="md-nav__item"> <a href="../related_projects/" class="md-nav__link"> <span class="md-ellipsis"> Related Projects </span>
</a> </li>
<li class="md-nav__item"> <a href="../media_and_publicity/" class="md-nav__link"> <span class="md-ellipsis"> Media and Publicity </span>
</a> </li>
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</a> </li>
<li class="md-nav__item"> <a href="../sponsorship_and_donations/" class="md-nav__link"> <span class="md-ellipsis"> Sponsorship and Donations </span>
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<nav class="md-nav md-nav--secondary" aria-label="Table of contents"> <label class="md-nav__title" for="__toc"> <span class="md-nav__icon md-icon"></span> Table of contents </label> <ul class="md-nav__list" data-md-component="toc" data-md-scrollfix> <li class="md-nav__item"> <a href="#chmod-chown-removexattr-setxattr-truncate-utimens" class="md-nav__link"> <span class="md-ellipsis"> chmod, chown, removexattr, setxattr, truncate, utimens </span> </a> </li> <li class="md-nav__item"> <a href="#unlink-rmdir" class="md-nav__link"> <span class="md-ellipsis"> unlink, rmdir </span> </a> </li> <li class="md-nav__item"> <a href="#others" class="md-nav__link"> <span class="md-ellipsis"> others </span> </a> </li> </ul> </nav> </div> </div> </div> <div class="md-content" data-md-component="content"> <article class="md-content__inner md-typeset">
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<h1 id="error-handling">Error Handling</h1><p>POSIX filesystem functions offer a single return code meaning thatthere is some complication regarding the handling of multiple branchesas mergerfs does. It tries to handle errors in a way that wouldgenerally return meaningful values for that particular function.</p><h3 id="chmod-chown-removexattr-setxattr-truncate-utimens">chmod, chown, removexattr, setxattr, truncate, utimens</h3><ol><li>if no error: return 0 (success)</li><li>if no successes: return first error</li><li>if one of the files acted on was the same as the related search function: return its value</li><li>return 0 (success)</li></ol><p>While doing this increases the complexity and cost of error handling,particularly step 3, this provides probably the most reasonable returnvalue.</p><h3 id="unlink-rmdir">unlink, rmdir</h3><ol><li>if no errors: return 0 (success)</li><li>return first error</li></ol><p>Older versions of mergerfs would return success if any success occurredbut for unlink and rmdir there are downstream assumptions that, whilenot impossible to occur, can confuse some software.</p><h3 id="others">others</h3><p>For search functions, there is always a single thing acted on and assuch whatever return value that comes from the single function call isreturned.</p><p>For create functions <code>mkdir</code>, <code>mknod</code>, and <code>symlink</code> which don'treturn a file descriptor and therefore can have <code>all</code> or <code>epall</code>policies it will return success if any of the calls succeed and anerror otherwise.</p>
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