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<h1 id="xattr">xattr</h1><ul><li><code>xattr=passthrough</code>: Passes through all requests to underlying file.</li><li><code>xattr=noattr</code>: mergerfs receives the request but returns <code>NOATTR</code>.</li><li><code>xattr=nosys</code>: Tells the kernel to reject all <code>xattr</code> requests.</li><li>Defaults to <code>passthrough</code>.</li></ul><p>Runtime extended attribute support can be managed via the <code>xattr</code>option. By default it will passthrough any xattr calls. Given xattrsupport is rarely used and can have significant performanceimplications mergerfs allows it to be disabled at runtime. Theperformance problems mostly comes when file caching is enabled. Thekernel will send a <code>getxattr</code> for <code>security.capability</code> <em>before everysingle write</em>. It doesn't cache the responses to any <code>getxattr</code>. Thismight be addressed in the future but for now mergerfs can really onlyoffer the following workarounds.</p><p><code>noattr</code> will cause mergerfs to short circuit all xattr calls andreturn ENOATTR where appropriate. mergerfs still gets all the requestsbut they will not be forwarded on to the underlying filesystems. Theruntime control will still function in this mode.</p><p><code>nosys</code> will cause mergerfs to return <code>ENOSYS</code> for any xattr call. Thedifference with <code>noattr</code> is that the kernel will cache this fact anditself short circuit future calls. This is more efficient than<code>noattr</code> but will cause mergerfs' runtime control via the hidden fileto stop working.</p>
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